1//===--- ParseDecl.cpp - Declaration Parsing --------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Declaration portions of the Parser interfaces.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/ASTContext.h"
14#include "clang/AST/DeclTemplate.h"
15#include "clang/AST/PrettyDeclStackTrace.h"
16#include "clang/Basic/AddressSpaces.h"
17#include "clang/Basic/AttributeCommonInfo.h"
18#include "clang/Basic/Attributes.h"
19#include "clang/Basic/CharInfo.h"
20#include "clang/Basic/DiagnosticParse.h"
21#include "clang/Basic/TargetInfo.h"
22#include "clang/Basic/TokenKinds.h"
23#include "clang/Parse/Parser.h"
24#include "clang/Parse/RAIIObjectsForParser.h"
25#include "clang/Sema/EnterExpressionEvaluationContext.h"
26#include "clang/Sema/Lookup.h"
27#include "clang/Sema/ParsedAttr.h"
28#include "clang/Sema/ParsedTemplate.h"
29#include "clang/Sema/Scope.h"
30#include "clang/Sema/SemaCUDA.h"
31#include "clang/Sema/SemaCodeCompletion.h"
32#include "clang/Sema/SemaObjC.h"
33#include "clang/Sema/SemaOpenMP.h"
34#include "llvm/ADT/ScopeExit.h"
35#include "llvm/ADT/SmallSet.h"
36#include "llvm/ADT/StringSwitch.h"
37#include <optional>
38
39using namespace clang;
40
41//===----------------------------------------------------------------------===//
42// C99 6.7: Declarations.
43//===----------------------------------------------------------------------===//
44
45TypeResult Parser::ParseTypeName(SourceRange *Range, DeclaratorContext Context,
46 AccessSpecifier AS, Decl **OwnedType,
47 ParsedAttributes *Attrs) {
48 DeclSpecContext DSC = getDeclSpecContextFromDeclaratorContext(Context);
49 if (DSC == DeclSpecContext::DSC_normal)
50 DSC = DeclSpecContext::DSC_type_specifier;
51
52 // Parse the common declaration-specifiers piece.
53 DeclSpec DS(AttrFactory);
54 if (Attrs)
55 DS.addAttributes(AL: *Attrs);
56 ParseSpecifierQualifierList(DS, AS, DSC);
57 if (OwnedType)
58 *OwnedType = DS.isTypeSpecOwned() ? DS.getRepAsDecl() : nullptr;
59
60 // Move declspec attributes to ParsedAttributes
61 if (Attrs) {
62 llvm::SmallVector<ParsedAttr *, 1> ToBeMoved;
63 for (ParsedAttr &AL : DS.getAttributes()) {
64 if (AL.isDeclspecAttribute())
65 ToBeMoved.push_back(Elt: &AL);
66 }
67
68 for (ParsedAttr *AL : ToBeMoved)
69 Attrs->takeOneFrom(Other&: DS.getAttributes(), PA: AL);
70 }
71
72 // Parse the abstract-declarator, if present.
73 Declarator DeclaratorInfo(DS, ParsedAttributesView::none(), Context);
74 ParseDeclarator(D&: DeclaratorInfo);
75 if (Range)
76 *Range = DeclaratorInfo.getSourceRange();
77
78 if (DeclaratorInfo.isInvalidType())
79 return true;
80
81 return Actions.ActOnTypeName(D&: DeclaratorInfo);
82}
83
84/// Normalizes an attribute name by dropping prefixed and suffixed __.
85static StringRef normalizeAttrName(StringRef Name) {
86 if (Name.size() >= 4 && Name.starts_with(Prefix: "__") && Name.ends_with(Suffix: "__"))
87 return Name.drop_front(N: 2).drop_back(N: 2);
88 return Name;
89}
90
91/// returns true iff attribute is annotated with `LateAttrParseExperimentalExt`
92/// in `Attr.td`.
93static bool IsAttributeLateParsedExperimentalExt(const IdentifierInfo &II) {
94#define CLANG_ATTR_LATE_PARSED_EXPERIMENTAL_EXT_LIST
95 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
96#include "clang/Parse/AttrParserStringSwitches.inc"
97 .Default(Value: false);
98#undef CLANG_ATTR_LATE_PARSED_EXPERIMENTAL_EXT_LIST
99}
100
101/// returns true iff attribute is annotated with `LateAttrParseStandard` in
102/// `Attr.td`.
103static bool IsAttributeLateParsedStandard(const IdentifierInfo &II) {
104#define CLANG_ATTR_LATE_PARSED_LIST
105 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
106#include "clang/Parse/AttrParserStringSwitches.inc"
107 .Default(Value: false);
108#undef CLANG_ATTR_LATE_PARSED_LIST
109}
110
111/// Such attributes need their arguments parsed inside a function prototype
112/// scope so the arguments can reference the function's parameters.
113static bool IsAttributeArgsParsedInFunctionScope(const IdentifierInfo &II) {
114#define CLANG_ATTR_PARSE_ARGS_IN_FUNCTION_SCOPE_LIST
115 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
116#include "clang/Parse/AttrParserStringSwitches.inc"
117 .Default(Value: false);
118#undef CLANG_ATTR_PARSE_ARGS_IN_FUNCTION_SCOPE_LIST
119}
120
121/// Check if the a start and end source location expand to the same macro.
122static bool FindLocsWithCommonFileID(Preprocessor &PP, SourceLocation StartLoc,
123 SourceLocation EndLoc) {
124 if (!StartLoc.isMacroID() || !EndLoc.isMacroID())
125 return false;
126
127 SourceManager &SM = PP.getSourceManager();
128 if (SM.getFileID(SpellingLoc: StartLoc) != SM.getFileID(SpellingLoc: EndLoc))
129 return false;
130
131 bool AttrStartIsInMacro =
132 Lexer::isAtStartOfMacroExpansion(loc: StartLoc, SM, LangOpts: PP.getLangOpts());
133 bool AttrEndIsInMacro =
134 Lexer::isAtEndOfMacroExpansion(loc: EndLoc, SM, LangOpts: PP.getLangOpts());
135 return AttrStartIsInMacro && AttrEndIsInMacro;
136}
137
138void Parser::ParseAttributes(unsigned WhichAttrKinds, ParsedAttributes &Attrs,
139 LateParsedAttrList *LateAttrs) {
140 bool MoreToParse;
141 do {
142 // Assume there's nothing left to parse, but if any attributes are in fact
143 // parsed, loop to ensure all specified attribute combinations are parsed.
144 MoreToParse = false;
145 if (WhichAttrKinds & PAKM_CXX11)
146 MoreToParse |= MaybeParseCXX11Attributes(Attrs);
147 if (WhichAttrKinds & PAKM_GNU)
148 MoreToParse |= MaybeParseGNUAttributes(Attrs, LateAttrs);
149 if (WhichAttrKinds & PAKM_Declspec)
150 MoreToParse |= MaybeParseMicrosoftDeclSpecs(Attrs);
151 } while (MoreToParse);
152}
153
154bool Parser::ParseSingleGNUAttribute(ParsedAttributes &Attrs,
155 SourceLocation &EndLoc,
156 LateParsedAttrList *LateAttrs,
157 Declarator *D) {
158 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
159 if (!AttrName)
160 return true;
161
162 SourceLocation AttrNameLoc = ConsumeToken();
163
164 if (Tok.isNot(K: tok::l_paren)) {
165 Attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
166 form: ParsedAttr::Form::GNU());
167 return false;
168 }
169
170 bool LateParse = false;
171 if (!LateAttrs)
172 LateParse = false;
173 else if (LateAttrs->lateAttrParseExperimentalExtOnly()) {
174 // The caller requested that this attribute **only** be late
175 // parsed for `LateAttrParseExperimentalExt` attributes. This will
176 // only be late parsed if the experimental language option is enabled.
177 LateParse = getLangOpts().ExperimentalLateParseAttributes &&
178 IsAttributeLateParsedExperimentalExt(II: *AttrName);
179 } else {
180 // The caller did not restrict late parsing to only
181 // `LateAttrParseExperimentalExt` attributes so late parse
182 // both `LateAttrParseStandard` and `LateAttrParseExperimentalExt`
183 // attributes.
184 LateParse = IsAttributeLateParsedExperimentalExt(II: *AttrName) ||
185 IsAttributeLateParsedStandard(II: *AttrName);
186 }
187
188 // Handle "parameterized" attributes
189 if (!LateParse) {
190 ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc: &EndLoc, ScopeName: nullptr,
191 ScopeLoc: SourceLocation(), Form: ParsedAttr::Form::GNU(), D);
192 return false;
193 }
194
195 // Handle attributes with arguments that require late parsing.
196 LateParsedAttribute *LA =
197 new LateParsedAttribute(this, *AttrName, AttrNameLoc);
198 LateAttrs->push_back(Elt: LA);
199
200 // Attributes in a class are parsed at the end of the class, along
201 // with other late-parsed declarations.
202 if (!ClassStack.empty() && !LateAttrs->parseSoon())
203 getCurrentClass().LateParsedDeclarations.push_back(Elt: LA);
204
205 // Be sure ConsumeAndStoreUntil doesn't see the start l_paren, since it
206 // recursively consumes balanced parens.
207 LA->Toks.push_back(Elt: Tok);
208 ConsumeParen();
209 // Consume everything up to and including the matching right parens.
210 ConsumeAndStoreUntil(T1: tok::r_paren, Toks&: LA->Toks, /*StopAtSemi=*/true);
211
212 Token Eof;
213 Eof.startToken();
214 Eof.setLocation(Tok.getLocation());
215 LA->Toks.push_back(Elt: Eof);
216
217 return false;
218}
219
220void Parser::ParseGNUAttributes(ParsedAttributes &Attrs,
221 LateParsedAttrList *LateAttrs, Declarator *D) {
222 assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!");
223
224 SourceLocation StartLoc = Tok.getLocation();
225 SourceLocation EndLoc = StartLoc;
226
227 while (Tok.is(K: tok::kw___attribute)) {
228 SourceLocation AttrTokLoc = ConsumeToken();
229 unsigned OldNumAttrs = Attrs.size();
230 unsigned OldNumLateAttrs = LateAttrs ? LateAttrs->size() : 0;
231
232 if (ExpectAndConsume(ExpectedTok: tok::l_paren, Diag: diag::err_expected_lparen_after,
233 DiagMsg: "attribute")) {
234 SkipUntil(T: tok::r_paren, Flags: StopAtSemi); // skip until ) or ;
235 return;
236 }
237 if (ExpectAndConsume(ExpectedTok: tok::l_paren, Diag: diag::err_expected_lparen_after, DiagMsg: "(")) {
238 SkipUntil(T: tok::r_paren, Flags: StopAtSemi); // skip until ) or ;
239 return;
240 }
241 // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
242 do {
243 // Eat preceeding commas to allow __attribute__((,,,foo))
244 while (TryConsumeToken(Expected: tok::comma))
245 ;
246
247 // Expect an identifier or declaration specifier (const, int, etc.)
248 if (Tok.isAnnotation())
249 break;
250 if (Tok.is(K: tok::code_completion)) {
251 cutOffParsing();
252 Actions.CodeCompletion().CodeCompleteAttribute(
253 Syntax: AttributeCommonInfo::Syntax::AS_GNU);
254 break;
255 }
256
257 if (ParseSingleGNUAttribute(Attrs, EndLoc, LateAttrs, D))
258 break;
259 } while (Tok.is(K: tok::comma));
260
261 if (ExpectAndConsume(ExpectedTok: tok::r_paren))
262 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
263 SourceLocation Loc = Tok.getLocation();
264 if (ExpectAndConsume(ExpectedTok: tok::r_paren))
265 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
266 EndLoc = Loc;
267
268 // If this was declared in a macro, attach the macro IdentifierInfo to the
269 // parsed attribute.
270 auto &SM = PP.getSourceManager();
271 if (!SM.isWrittenInBuiltinFile(Loc: SM.getSpellingLoc(Loc: AttrTokLoc)) &&
272 FindLocsWithCommonFileID(PP, StartLoc: AttrTokLoc, EndLoc: Loc)) {
273 CharSourceRange ExpansionRange = SM.getExpansionRange(Loc: AttrTokLoc);
274 StringRef FoundName =
275 Lexer::getSourceText(Range: ExpansionRange, SM, LangOpts: PP.getLangOpts());
276 IdentifierInfo *MacroII = PP.getIdentifierInfo(Name: FoundName);
277
278 for (unsigned i = OldNumAttrs; i < Attrs.size(); ++i)
279 Attrs[i].setMacroIdentifier(MacroName: MacroII, Loc: ExpansionRange.getBegin());
280
281 if (LateAttrs) {
282 for (unsigned i = OldNumLateAttrs; i < LateAttrs->size(); ++i)
283 (*LateAttrs)[i]->MacroII = MacroII;
284 }
285 }
286 }
287
288 Attrs.Range = SourceRange(StartLoc, EndLoc);
289}
290
291/// Determine whether the given attribute has an identifier argument.
292static bool attributeHasIdentifierArg(const llvm::Triple &T,
293 const IdentifierInfo &II,
294 ParsedAttr::Syntax Syntax,
295 IdentifierInfo *ScopeName) {
296#define CLANG_ATTR_IDENTIFIER_ARG_LIST
297 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
298#include "clang/Parse/AttrParserStringSwitches.inc"
299 .Default(Value: false);
300#undef CLANG_ATTR_IDENTIFIER_ARG_LIST
301}
302
303/// Determine whether the given attribute has string arguments.
304static ParsedAttributeArgumentsProperties
305attributeStringLiteralListArg(const llvm::Triple &T, const IdentifierInfo &II,
306 ParsedAttr::Syntax Syntax,
307 IdentifierInfo *ScopeName) {
308#define CLANG_ATTR_STRING_LITERAL_ARG_LIST
309 return llvm::StringSwitch<uint32_t>(normalizeAttrName(Name: II.getName()))
310#include "clang/Parse/AttrParserStringSwitches.inc"
311 .Default(Value: 0);
312#undef CLANG_ATTR_STRING_LITERAL_ARG_LIST
313}
314
315/// Determine whether the given attribute has a variadic identifier argument.
316static bool attributeHasVariadicIdentifierArg(const IdentifierInfo &II,
317 ParsedAttr::Syntax Syntax,
318 IdentifierInfo *ScopeName) {
319#define CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
320 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
321#include "clang/Parse/AttrParserStringSwitches.inc"
322 .Default(Value: false);
323#undef CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
324}
325
326/// Determine whether the given attribute treats kw_this as an identifier.
327static bool attributeTreatsKeywordThisAsIdentifier(const IdentifierInfo &II,
328 ParsedAttr::Syntax Syntax,
329 IdentifierInfo *ScopeName) {
330#define CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
331 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
332#include "clang/Parse/AttrParserStringSwitches.inc"
333 .Default(Value: false);
334#undef CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
335}
336
337/// Determine if an attribute accepts parameter packs.
338static bool attributeAcceptsExprPack(const IdentifierInfo &II,
339 ParsedAttr::Syntax Syntax,
340 IdentifierInfo *ScopeName) {
341#define CLANG_ATTR_ACCEPTS_EXPR_PACK
342 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
343#include "clang/Parse/AttrParserStringSwitches.inc"
344 .Default(Value: false);
345#undef CLANG_ATTR_ACCEPTS_EXPR_PACK
346}
347
348/// Determine whether the given attribute parses a type argument.
349static bool attributeIsTypeArgAttr(const IdentifierInfo &II,
350 ParsedAttr::Syntax Syntax,
351 IdentifierInfo *ScopeName) {
352#define CLANG_ATTR_TYPE_ARG_LIST
353 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
354#include "clang/Parse/AttrParserStringSwitches.inc"
355 .Default(Value: false);
356#undef CLANG_ATTR_TYPE_ARG_LIST
357}
358
359/// Determine whether the given attribute takes a strict identifier argument.
360static bool attributeHasStrictIdentifierArgs(const IdentifierInfo &II,
361 ParsedAttr::Syntax Syntax,
362 IdentifierInfo *ScopeName) {
363#define CLANG_ATTR_STRICT_IDENTIFIER_ARG_LIST
364 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
365#include "clang/Parse/AttrParserStringSwitches.inc"
366 .Default(Value: false);
367#undef CLANG_ATTR_STRICT_IDENTIFIER_ARG_LIST
368}
369
370/// Determine whether the given attribute requires parsing its arguments
371/// in an unevaluated context or not.
372static bool attributeParsedArgsUnevaluated(const IdentifierInfo &II,
373 ParsedAttr::Syntax Syntax,
374 IdentifierInfo *ScopeName) {
375#define CLANG_ATTR_ARG_CONTEXT_LIST
376 return llvm::StringSwitch<bool>(normalizeAttrName(Name: II.getName()))
377#include "clang/Parse/AttrParserStringSwitches.inc"
378 .Default(Value: false);
379#undef CLANG_ATTR_ARG_CONTEXT_LIST
380}
381
382IdentifierLoc *Parser::ParseIdentifierLoc() {
383 assert(Tok.is(tok::identifier) && "expected an identifier");
384 IdentifierLoc *IL = new (Actions.Context)
385 IdentifierLoc(Tok.getLocation(), Tok.getIdentifierInfo());
386 ConsumeToken();
387 return IL;
388}
389
390void Parser::ParseAttributeWithTypeArg(IdentifierInfo &AttrName,
391 SourceLocation AttrNameLoc,
392 ParsedAttributes &Attrs,
393 IdentifierInfo *ScopeName,
394 SourceLocation ScopeLoc,
395 ParsedAttr::Form Form) {
396 BalancedDelimiterTracker Parens(*this, tok::l_paren);
397 Parens.consumeOpen();
398
399 TypeResult T;
400 if (Tok.isNot(K: tok::r_paren))
401 T = ParseTypeName();
402
403 if (Parens.consumeClose())
404 return;
405
406 if (T.isInvalid())
407 return;
408
409 if (T.isUsable())
410 Attrs.addNewTypeAttr(
411 attrName: &AttrName, attrRange: SourceRange(AttrNameLoc, Parens.getCloseLocation()),
412 scope: AttributeScopeInfo(ScopeName, ScopeLoc), typeArg: T.get(), formUsed: Form);
413 else
414 Attrs.addNew(attrName: &AttrName, attrRange: SourceRange(AttrNameLoc, Parens.getCloseLocation()),
415 scope: AttributeScopeInfo(ScopeName, ScopeLoc), args: nullptr, numArgs: 0, form: Form);
416}
417
418ExprResult
419Parser::ParseUnevaluatedStringInAttribute(const IdentifierInfo &AttrName) {
420 if (Tok.is(K: tok::l_paren)) {
421 BalancedDelimiterTracker Paren(*this, tok::l_paren);
422 Paren.consumeOpen();
423 ExprResult Res = ParseUnevaluatedStringInAttribute(AttrName);
424 Paren.consumeClose();
425 return Res;
426 }
427 if (!isTokenStringLiteral()) {
428 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_string_literal)
429 << /*in attribute...*/ 4 << AttrName.getName();
430 return ExprError();
431 }
432 return ParseUnevaluatedStringLiteralExpression();
433}
434
435bool Parser::ParseAttributeArgumentList(
436 const IdentifierInfo &AttrName, SmallVectorImpl<Expr *> &Exprs,
437 ParsedAttributeArgumentsProperties ArgsProperties, unsigned Arg) {
438 bool SawError = false;
439 while (true) {
440 ExprResult Expr;
441 if (ArgsProperties.isStringLiteralArg(I: Arg)) {
442 Expr = ParseUnevaluatedStringInAttribute(AttrName);
443 } else if (getLangOpts().CPlusPlus11 && Tok.is(K: tok::l_brace)) {
444 Diag(Tok, DiagID: diag::warn_cxx98_compat_generalized_initializer_lists);
445 Expr = ParseBraceInitializer();
446 } else {
447 Expr = ParseAssignmentExpression();
448 }
449
450 if (Tok.is(K: tok::ellipsis))
451 Expr = Actions.ActOnPackExpansion(Pattern: Expr.get(), EllipsisLoc: ConsumeToken());
452 else if (Tok.is(K: tok::code_completion)) {
453 // There's nothing to suggest in here as we parsed a full expression.
454 // Instead fail and propagate the error since caller might have something
455 // the suggest, e.g. signature help in function call. Note that this is
456 // performed before pushing the \p Expr, so that signature help can report
457 // current argument correctly.
458 SawError = true;
459 cutOffParsing();
460 break;
461 }
462
463 if (Expr.isInvalid()) {
464 SawError = true;
465 break;
466 }
467
468 if (Actions.DiagnoseUnexpandedParameterPack(E: Expr.get())) {
469 SawError = true;
470 break;
471 }
472
473 Exprs.push_back(Elt: Expr.get());
474
475 if (Tok.isNot(K: tok::comma))
476 break;
477 // Move to the next argument, remember where the comma was.
478 Token Comma = Tok;
479 ConsumeToken();
480 checkPotentialAngleBracketDelimiter(OpToken: Comma);
481 Arg++;
482 }
483
484 return SawError;
485}
486
487unsigned Parser::ParseAttributeArgsCommon(
488 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
489 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
490 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
491 // Ignore the left paren location for now.
492 ConsumeParen();
493
494 bool ChangeKWThisToIdent = attributeTreatsKeywordThisAsIdentifier(
495 II: *AttrName, Syntax: Form.getSyntax(), ScopeName);
496 bool AttributeIsTypeArgAttr =
497 attributeIsTypeArgAttr(II: *AttrName, Syntax: Form.getSyntax(), ScopeName);
498 bool AttributeHasVariadicIdentifierArg =
499 attributeHasVariadicIdentifierArg(II: *AttrName, Syntax: Form.getSyntax(), ScopeName);
500
501 // Interpret "kw_this" as an identifier if the attributed requests it.
502 if (ChangeKWThisToIdent && Tok.is(K: tok::kw_this))
503 Tok.setKind(tok::identifier);
504
505 ArgsVector ArgExprs;
506 if (Tok.is(K: tok::identifier)) {
507 // If this attribute wants an 'identifier' argument, make it so.
508 bool IsIdentifierArg =
509 AttributeHasVariadicIdentifierArg ||
510 attributeHasIdentifierArg(T: getTargetInfo().getTriple(), II: *AttrName,
511 Syntax: Form.getSyntax(), ScopeName);
512 ParsedAttr::Kind AttrKind =
513 ParsedAttr::getParsedKind(Name: AttrName, Scope: ScopeName, SyntaxUsed: Form.getSyntax());
514
515 // If we don't know how to parse this attribute, but this is the only
516 // token in this argument, assume it's meant to be an identifier.
517 if (AttrKind == ParsedAttr::UnknownAttribute ||
518 AttrKind == ParsedAttr::IgnoredAttribute) {
519 const Token &Next = NextToken();
520 IsIdentifierArg = Next.isOneOf(Ks: tok::r_paren, Ks: tok::comma);
521 }
522
523 if (IsIdentifierArg)
524 ArgExprs.push_back(Elt: ParseIdentifierLoc());
525 }
526
527 ParsedType TheParsedType;
528 if (!ArgExprs.empty() ? Tok.is(K: tok::comma) : Tok.isNot(K: tok::r_paren)) {
529 // Eat the comma.
530 if (!ArgExprs.empty())
531 ConsumeToken();
532
533 if (AttributeIsTypeArgAttr) {
534 // FIXME: Multiple type arguments are not implemented.
535 TypeResult T = ParseTypeName();
536 if (T.isInvalid()) {
537 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
538 return 0;
539 }
540 if (T.isUsable())
541 TheParsedType = T.get();
542 } else if (AttributeHasVariadicIdentifierArg ||
543 attributeHasStrictIdentifierArgs(II: *AttrName, Syntax: Form.getSyntax(),
544 ScopeName)) {
545 // Parse variadic identifier arg. This can either consume identifiers or
546 // expressions. Variadic identifier args do not support parameter packs
547 // because those are typically used for attributes with enumeration
548 // arguments, and those enumerations are not something the user could
549 // express via a pack.
550 do {
551 // Interpret "kw_this" as an identifier if the attributed requests it.
552 if (ChangeKWThisToIdent && Tok.is(K: tok::kw_this))
553 Tok.setKind(tok::identifier);
554
555 ExprResult ArgExpr;
556 if (Tok.is(K: tok::identifier)) {
557 ArgExprs.push_back(Elt: ParseIdentifierLoc());
558 } else {
559 bool Uneval = attributeParsedArgsUnevaluated(
560 II: *AttrName, Syntax: Form.getSyntax(), ScopeName);
561 EnterExpressionEvaluationContext Unevaluated(
562 Actions,
563 Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
564 : Sema::ExpressionEvaluationContext::ConstantEvaluated,
565 nullptr,
566 Sema::ExpressionEvaluationContextRecord::EK_AttrArgument);
567
568 ExprResult ArgExpr = ParseAssignmentExpression();
569 if (ArgExpr.isInvalid()) {
570 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
571 return 0;
572 }
573 ArgExprs.push_back(Elt: ArgExpr.get());
574 }
575 // Eat the comma, move to the next argument
576 } while (TryConsumeToken(Expected: tok::comma));
577 } else {
578 // General case. Parse all available expressions.
579 bool Uneval = attributeParsedArgsUnevaluated(II: *AttrName, Syntax: Form.getSyntax(),
580 ScopeName);
581 EnterExpressionEvaluationContext Unevaluated(
582 Actions,
583 Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
584 : Sema::ExpressionEvaluationContext::ConstantEvaluated,
585 nullptr,
586 Sema::ExpressionEvaluationContextRecord::ExpressionKind::
587 EK_AttrArgument);
588
589 ExprVector ParsedExprs;
590 ParsedAttributeArgumentsProperties ArgProperties =
591 attributeStringLiteralListArg(T: getTargetInfo().getTriple(), II: *AttrName,
592 Syntax: Form.getSyntax(), ScopeName);
593 if (ParseAttributeArgumentList(AttrName: *AttrName, Exprs&: ParsedExprs, ArgsProperties: ArgProperties,
594 Arg: ArgExprs.size())) {
595 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
596 return 0;
597 }
598
599 // Pack expansion must currently be explicitly supported by an attribute.
600 for (size_t I = 0; I < ParsedExprs.size(); ++I) {
601 if (!isa<PackExpansionExpr>(Val: ParsedExprs[I]))
602 continue;
603
604 if (!attributeAcceptsExprPack(II: *AttrName, Syntax: Form.getSyntax(), ScopeName)) {
605 Diag(Loc: Tok.getLocation(),
606 DiagID: diag::err_attribute_argument_parm_pack_not_supported)
607 << AttrName;
608 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
609 return 0;
610 }
611 }
612
613 llvm::append_range(C&: ArgExprs, R&: ParsedExprs);
614 }
615 }
616
617 SourceLocation RParen = Tok.getLocation();
618 if (!ExpectAndConsume(ExpectedTok: tok::r_paren)) {
619 SourceLocation AttrLoc = ScopeLoc.isValid() ? ScopeLoc : AttrNameLoc;
620
621 if (AttributeIsTypeArgAttr && !TheParsedType.get().isNull()) {
622 Attrs.addNewTypeAttr(attrName: AttrName, attrRange: SourceRange(AttrNameLoc, RParen),
623 scope: AttributeScopeInfo(ScopeName, ScopeLoc),
624 typeArg: TheParsedType, formUsed: Form);
625 } else {
626 Attrs.addNew(attrName: AttrName, attrRange: SourceRange(AttrLoc, RParen),
627 scope: AttributeScopeInfo(ScopeName, ScopeLoc), args: ArgExprs.data(),
628 numArgs: ArgExprs.size(), form: Form);
629 }
630 }
631
632 if (EndLoc)
633 *EndLoc = RParen;
634
635 return static_cast<unsigned>(ArgExprs.size() + !TheParsedType.get().isNull());
636}
637
638void Parser::ParseGNUAttributeArgs(
639 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
640 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
641 SourceLocation ScopeLoc, ParsedAttr::Form Form, Declarator *D) {
642
643 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
644
645 ParsedAttr::Kind AttrKind =
646 ParsedAttr::getParsedKind(Name: AttrName, Scope: ScopeName, SyntaxUsed: Form.getSyntax());
647
648 if (AttrKind == ParsedAttr::AT_Availability) {
649 ParseAvailabilityAttribute(Availability&: *AttrName, AvailabilityLoc: AttrNameLoc, attrs&: Attrs, endLoc: EndLoc, ScopeName,
650 ScopeLoc, Form);
651 return;
652 } else if (AttrKind == ParsedAttr::AT_ExternalSourceSymbol) {
653 ParseExternalSourceSymbolAttribute(ExternalSourceSymbol&: *AttrName, Loc: AttrNameLoc, Attrs, EndLoc,
654 ScopeName, ScopeLoc, Form);
655 return;
656 } else if (AttrKind == ParsedAttr::AT_ObjCBridgeRelated) {
657 ParseObjCBridgeRelatedAttribute(ObjCBridgeRelated&: *AttrName, ObjCBridgeRelatedLoc: AttrNameLoc, Attrs, EndLoc,
658 ScopeName, ScopeLoc, Form);
659 return;
660 } else if (AttrKind == ParsedAttr::AT_SwiftNewType) {
661 ParseSwiftNewTypeAttribute(AttrName&: *AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
662 ScopeLoc, Form);
663 return;
664 } else if (AttrKind == ParsedAttr::AT_TypeTagForDatatype) {
665 ParseTypeTagForDatatypeAttribute(AttrName&: *AttrName, AttrNameLoc, Attrs, EndLoc,
666 ScopeName, ScopeLoc, Form);
667 return;
668 } else if (attributeIsTypeArgAttr(II: *AttrName, Syntax: Form.getSyntax(), ScopeName)) {
669 ParseAttributeWithTypeArg(AttrName&: *AttrName, AttrNameLoc, Attrs, ScopeName,
670 ScopeLoc, Form);
671 return;
672 } else if (AttrKind == ParsedAttr::AT_CountedBy ||
673 AttrKind == ParsedAttr::AT_CountedByOrNull ||
674 AttrKind == ParsedAttr::AT_SizedBy ||
675 AttrKind == ParsedAttr::AT_SizedByOrNull) {
676 ParseBoundsAttribute(AttrName&: *AttrName, AttrNameLoc, Attrs, ScopeName, ScopeLoc,
677 Form);
678 return;
679 } else if (AttrKind == ParsedAttr::AT_CXXAssume) {
680 ParseCXXAssumeAttributeArg(Attrs, AttrName, AttrNameLoc, ScopeName,
681 ScopeLoc, EndLoc, Form);
682 return;
683 }
684
685 // These may refer to the function arguments, but need to be parsed early to
686 // participate in determining whether it's a redeclaration.
687 std::optional<ParseScope> PrototypeScope;
688 if (D && IsAttributeArgsParsedInFunctionScope(II: *AttrName)) {
689 // Find the innermost function chunk to make its parameters available for
690 // attribute argument parsing. This is necessary for attributes like thread
691 // safety annotations on function pointers which reference their parameters.
692 const DeclaratorChunk::FunctionTypeInfo *FTI = nullptr;
693 for (unsigned i = 0; i < D->getNumTypeObjects(); ++i) {
694 if (D->getTypeObject(i).Kind == DeclaratorChunk::Function) {
695 FTI = &D->getTypeObject(i).Fun;
696 break;
697 }
698 }
699
700 if (FTI) {
701 // Inherit the class scope flag from the current context. This is safe
702 // because it only preserves existing struct/class visibility, which is
703 // required for attributes to resolve sibling members in C structs.
704 PrototypeScope.emplace(
705 args: this, args: Scope::FunctionPrototypeScope |
706 Scope::FunctionDeclarationScope | Scope::DeclScope |
707 (getCurScope()->getFlags() & Scope::ClassScope));
708 for (unsigned i = 0; i < FTI->NumParams; ++i)
709 Actions.ActOnReenterCXXMethodParameter(
710 S: getCurScope(), Param: dyn_cast_or_null<ParmVarDecl>(Val: FTI->Params[i].Param));
711 }
712 }
713
714 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
715 ScopeLoc, Form);
716}
717
718unsigned Parser::ParseClangAttributeArgs(
719 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
720 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
721 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
722 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
723
724 ParsedAttr::Kind AttrKind =
725 ParsedAttr::getParsedKind(Name: AttrName, Scope: ScopeName, SyntaxUsed: Form.getSyntax());
726
727 switch (AttrKind) {
728 default:
729 return ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
730 ScopeName, ScopeLoc, Form);
731 case ParsedAttr::AT_ExternalSourceSymbol:
732 ParseExternalSourceSymbolAttribute(ExternalSourceSymbol&: *AttrName, Loc: AttrNameLoc, Attrs, EndLoc,
733 ScopeName, ScopeLoc, Form);
734 break;
735 case ParsedAttr::AT_Availability:
736 ParseAvailabilityAttribute(Availability&: *AttrName, AvailabilityLoc: AttrNameLoc, attrs&: Attrs, endLoc: EndLoc, ScopeName,
737 ScopeLoc, Form);
738 break;
739 case ParsedAttr::AT_ObjCBridgeRelated:
740 ParseObjCBridgeRelatedAttribute(ObjCBridgeRelated&: *AttrName, ObjCBridgeRelatedLoc: AttrNameLoc, Attrs, EndLoc,
741 ScopeName, ScopeLoc, Form);
742 break;
743 case ParsedAttr::AT_SwiftNewType:
744 ParseSwiftNewTypeAttribute(AttrName&: *AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
745 ScopeLoc, Form);
746 break;
747 case ParsedAttr::AT_TypeTagForDatatype:
748 ParseTypeTagForDatatypeAttribute(AttrName&: *AttrName, AttrNameLoc, Attrs, EndLoc,
749 ScopeName, ScopeLoc, Form);
750 break;
751
752 case ParsedAttr::AT_CXXAssume:
753 ParseCXXAssumeAttributeArg(Attrs, AttrName, AttrNameLoc, ScopeName,
754 ScopeLoc, EndLoc, Form);
755 break;
756 }
757 return !Attrs.empty() ? Attrs.begin()->getNumArgs() : 0;
758}
759
760bool Parser::ParseMicrosoftDeclSpecArgs(IdentifierInfo *AttrName,
761 SourceLocation AttrNameLoc,
762 ParsedAttributes &Attrs) {
763 unsigned ExistingAttrs = Attrs.size();
764
765 // If the attribute isn't known, we will not attempt to parse any
766 // arguments.
767 if (!hasAttribute(Syntax: AttributeCommonInfo::Syntax::AS_Declspec, Scope: nullptr, Attr: AttrName,
768 Target: getTargetInfo(), LangOpts: getLangOpts())) {
769 // Eat the left paren, then skip to the ending right paren.
770 ConsumeParen();
771 SkipUntil(T: tok::r_paren);
772 return false;
773 }
774
775 SourceLocation OpenParenLoc = Tok.getLocation();
776
777 if (AttrName->getName() == "property") {
778 // The property declspec is more complex in that it can take one or two
779 // assignment expressions as a parameter, but the lhs of the assignment
780 // must be named get or put.
781
782 BalancedDelimiterTracker T(*this, tok::l_paren);
783 T.expectAndConsume(DiagID: diag::err_expected_lparen_after,
784 Msg: AttrName->getNameStart(), SkipToTok: tok::r_paren);
785
786 enum AccessorKind {
787 AK_Invalid = -1,
788 AK_Put = 0,
789 AK_Get = 1 // indices into AccessorNames
790 };
791 IdentifierInfo *AccessorNames[] = {nullptr, nullptr};
792 bool HasInvalidAccessor = false;
793
794 // Parse the accessor specifications.
795 while (true) {
796 // Stop if this doesn't look like an accessor spec.
797 if (!Tok.is(K: tok::identifier)) {
798 // If the user wrote a completely empty list, use a special diagnostic.
799 if (Tok.is(K: tok::r_paren) && !HasInvalidAccessor &&
800 AccessorNames[AK_Put] == nullptr &&
801 AccessorNames[AK_Get] == nullptr) {
802 Diag(Loc: AttrNameLoc, DiagID: diag::err_ms_property_no_getter_or_putter);
803 break;
804 }
805
806 Diag(Loc: Tok.getLocation(), DiagID: diag::err_ms_property_unknown_accessor);
807 break;
808 }
809
810 AccessorKind Kind;
811 SourceLocation KindLoc = Tok.getLocation();
812 StringRef KindStr = Tok.getIdentifierInfo()->getName();
813 if (KindStr == "get") {
814 Kind = AK_Get;
815 } else if (KindStr == "put") {
816 Kind = AK_Put;
817
818 // Recover from the common mistake of using 'set' instead of 'put'.
819 } else if (KindStr == "set") {
820 Diag(Loc: KindLoc, DiagID: diag::err_ms_property_has_set_accessor)
821 << FixItHint::CreateReplacement(RemoveRange: KindLoc, Code: "put");
822 Kind = AK_Put;
823
824 // Handle the mistake of forgetting the accessor kind by skipping
825 // this accessor.
826 } else if (NextToken().is(K: tok::comma) || NextToken().is(K: tok::r_paren)) {
827 Diag(Loc: KindLoc, DiagID: diag::err_ms_property_missing_accessor_kind);
828 ConsumeToken();
829 HasInvalidAccessor = true;
830 goto next_property_accessor;
831
832 // Otherwise, complain about the unknown accessor kind.
833 } else {
834 Diag(Loc: KindLoc, DiagID: diag::err_ms_property_unknown_accessor);
835 HasInvalidAccessor = true;
836 Kind = AK_Invalid;
837
838 // Try to keep parsing unless it doesn't look like an accessor spec.
839 if (!NextToken().is(K: tok::equal))
840 break;
841 }
842
843 // Consume the identifier.
844 ConsumeToken();
845
846 // Consume the '='.
847 if (!TryConsumeToken(Expected: tok::equal)) {
848 Diag(Loc: Tok.getLocation(), DiagID: diag::err_ms_property_expected_equal)
849 << KindStr;
850 break;
851 }
852
853 // Expect the method name.
854 if (!Tok.is(K: tok::identifier)) {
855 Diag(Loc: Tok.getLocation(), DiagID: diag::err_ms_property_expected_accessor_name);
856 break;
857 }
858
859 if (Kind == AK_Invalid) {
860 // Just drop invalid accessors.
861 } else if (AccessorNames[Kind] != nullptr) {
862 // Complain about the repeated accessor, ignore it, and keep parsing.
863 Diag(Loc: KindLoc, DiagID: diag::err_ms_property_duplicate_accessor) << KindStr;
864 } else {
865 AccessorNames[Kind] = Tok.getIdentifierInfo();
866 }
867 ConsumeToken();
868
869 next_property_accessor:
870 // Keep processing accessors until we run out.
871 if (TryConsumeToken(Expected: tok::comma))
872 continue;
873
874 // If we run into the ')', stop without consuming it.
875 if (Tok.is(K: tok::r_paren))
876 break;
877
878 Diag(Loc: Tok.getLocation(), DiagID: diag::err_ms_property_expected_comma_or_rparen);
879 break;
880 }
881
882 // Only add the property attribute if it was well-formed.
883 if (!HasInvalidAccessor)
884 Attrs.addNewPropertyAttr(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(),
885 getterId: AccessorNames[AK_Get], setterId: AccessorNames[AK_Put],
886 formUsed: ParsedAttr::Form::Declspec());
887 T.skipToEnd();
888 return !HasInvalidAccessor;
889 }
890
891 unsigned NumArgs =
892 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc: nullptr, ScopeName: nullptr,
893 ScopeLoc: SourceLocation(), Form: ParsedAttr::Form::Declspec());
894
895 // If this attribute's args were parsed, and it was expected to have
896 // arguments but none were provided, emit a diagnostic.
897 if (ExistingAttrs < Attrs.size() && Attrs.back().getMaxArgs() && !NumArgs) {
898 Diag(Loc: OpenParenLoc, DiagID: diag::err_attribute_requires_arguments) << AttrName;
899 return false;
900 }
901 return true;
902}
903
904void Parser::ParseMicrosoftDeclSpecs(ParsedAttributes &Attrs) {
905 assert(getLangOpts().DeclSpecKeyword && "__declspec keyword is not enabled");
906 assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
907
908 SourceLocation StartLoc = Tok.getLocation();
909 SourceLocation EndLoc = StartLoc;
910
911 while (Tok.is(K: tok::kw___declspec)) {
912 ConsumeToken();
913 BalancedDelimiterTracker T(*this, tok::l_paren);
914 if (T.expectAndConsume(DiagID: diag::err_expected_lparen_after, Msg: "__declspec",
915 SkipToTok: tok::r_paren))
916 return;
917
918 // An empty declspec is perfectly legal and should not warn. Additionally,
919 // you can specify multiple attributes per declspec.
920 while (Tok.isNot(K: tok::r_paren)) {
921 // Attribute not present.
922 if (TryConsumeToken(Expected: tok::comma))
923 continue;
924
925 if (Tok.is(K: tok::code_completion)) {
926 cutOffParsing();
927 Actions.CodeCompletion().CodeCompleteAttribute(
928 Syntax: AttributeCommonInfo::AS_Declspec);
929 return;
930 }
931
932 // We expect either a well-known identifier or a generic string. Anything
933 // else is a malformed declspec.
934 bool IsString = Tok.getKind() == tok::string_literal;
935 if (!IsString && Tok.getKind() != tok::identifier &&
936 Tok.getKind() != tok::kw_restrict) {
937 Diag(Tok, DiagID: diag::err_ms_declspec_type);
938 T.skipToEnd();
939 return;
940 }
941
942 IdentifierInfo *AttrName;
943 SourceLocation AttrNameLoc;
944 if (IsString) {
945 SmallString<8> StrBuffer;
946 bool Invalid = false;
947 StringRef Str = PP.getSpelling(Tok, Buffer&: StrBuffer, Invalid: &Invalid);
948 if (Invalid) {
949 T.skipToEnd();
950 return;
951 }
952 AttrName = PP.getIdentifierInfo(Name: Str);
953 AttrNameLoc = ConsumeStringToken();
954 } else {
955 AttrName = Tok.getIdentifierInfo();
956 AttrNameLoc = ConsumeToken();
957 }
958
959 bool AttrHandled = false;
960
961 // Parse attribute arguments.
962 if (Tok.is(K: tok::l_paren))
963 AttrHandled = ParseMicrosoftDeclSpecArgs(AttrName, AttrNameLoc, Attrs);
964 else if (AttrName->getName() == "property")
965 // The property attribute must have an argument list.
966 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_lparen_after)
967 << AttrName->getName();
968
969 if (!AttrHandled)
970 Attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
971 form: ParsedAttr::Form::Declspec());
972 }
973 T.consumeClose();
974 EndLoc = T.getCloseLocation();
975 }
976
977 Attrs.Range = SourceRange(StartLoc, EndLoc);
978}
979
980void Parser::ParseMicrosoftTypeAttributes(ParsedAttributes &attrs) {
981 // Treat these like attributes
982 while (true) {
983 auto Kind = Tok.getKind();
984 switch (Kind) {
985 case tok::kw___fastcall:
986 case tok::kw___stdcall:
987 case tok::kw___thiscall:
988 case tok::kw___regcall:
989 case tok::kw___cdecl:
990 case tok::kw___vectorcall:
991 case tok::kw___ptr64:
992 case tok::kw___w64:
993 case tok::kw___ptr32:
994 case tok::kw___sptr:
995 case tok::kw___uptr: {
996 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
997 SourceLocation AttrNameLoc = ConsumeToken();
998 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
999 form: Kind);
1000 break;
1001 }
1002 default:
1003 return;
1004 }
1005 }
1006}
1007
1008void Parser::ParseWebAssemblyFuncrefTypeAttribute(ParsedAttributes &attrs) {
1009 assert(Tok.is(tok::kw___funcref));
1010 SourceLocation StartLoc = Tok.getLocation();
1011 if (!getTargetInfo().getTriple().isWasm()) {
1012 ConsumeToken();
1013 Diag(Loc: StartLoc, DiagID: diag::err_wasm_funcref_not_wasm);
1014 return;
1015 }
1016
1017 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1018 SourceLocation AttrNameLoc = ConsumeToken();
1019 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), /*Args=*/args: nullptr,
1020 /*numArgs=*/0, form: tok::kw___funcref);
1021}
1022
1023void Parser::DiagnoseAndSkipExtendedMicrosoftTypeAttributes() {
1024 SourceLocation StartLoc = Tok.getLocation();
1025 SourceLocation EndLoc = SkipExtendedMicrosoftTypeAttributes();
1026
1027 if (EndLoc.isValid()) {
1028 SourceRange Range(StartLoc, EndLoc);
1029 Diag(Loc: StartLoc, DiagID: diag::warn_microsoft_qualifiers_ignored) << Range;
1030 }
1031}
1032
1033SourceLocation Parser::SkipExtendedMicrosoftTypeAttributes() {
1034 SourceLocation EndLoc;
1035
1036 while (true) {
1037 switch (Tok.getKind()) {
1038 case tok::kw_const:
1039 case tok::kw_volatile:
1040 case tok::kw___fastcall:
1041 case tok::kw___stdcall:
1042 case tok::kw___thiscall:
1043 case tok::kw___cdecl:
1044 case tok::kw___vectorcall:
1045 case tok::kw___ptr32:
1046 case tok::kw___ptr64:
1047 case tok::kw___w64:
1048 case tok::kw___unaligned:
1049 case tok::kw___sptr:
1050 case tok::kw___uptr:
1051 EndLoc = ConsumeToken();
1052 break;
1053 default:
1054 return EndLoc;
1055 }
1056 }
1057}
1058
1059void Parser::ParseBorlandTypeAttributes(ParsedAttributes &attrs) {
1060 // Treat these like attributes
1061 while (Tok.is(K: tok::kw___pascal)) {
1062 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1063 SourceLocation AttrNameLoc = ConsumeToken();
1064 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
1065 form: tok::kw___pascal);
1066 }
1067}
1068
1069void Parser::ParseOpenCLKernelAttributes(ParsedAttributes &attrs) {
1070 // Treat these like attributes
1071 while (Tok.is(K: tok::kw___kernel)) {
1072 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1073 SourceLocation AttrNameLoc = ConsumeToken();
1074 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
1075 form: tok::kw___kernel);
1076 }
1077}
1078
1079void Parser::ParseCUDAFunctionAttributes(ParsedAttributes &attrs) {
1080 while (Tok.is(K: tok::kw___noinline__)) {
1081 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1082 SourceLocation AttrNameLoc = ConsumeToken();
1083 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
1084 form: tok::kw___noinline__);
1085 }
1086}
1087
1088void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) {
1089 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1090 SourceLocation AttrNameLoc = Tok.getLocation();
1091 Attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
1092 form: Tok.getKind());
1093}
1094
1095bool Parser::isHLSLQualifier(const Token &Tok) const {
1096 return Tok.is(K: tok::kw_groupshared) || Tok.is(K: tok::kw_row_major) ||
1097 Tok.is(K: tok::kw_column_major);
1098}
1099
1100void Parser::ParseHLSLQualifiers(ParsedAttributes &Attrs) {
1101 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1102 auto Kind = Tok.getKind();
1103 SourceLocation AttrNameLoc = ConsumeToken();
1104 Attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0, form: Kind);
1105}
1106
1107void Parser::ParseNullabilityTypeSpecifiers(ParsedAttributes &attrs) {
1108 // Treat these like attributes, even though they're type specifiers.
1109 while (true) {
1110 auto Kind = Tok.getKind();
1111 switch (Kind) {
1112 case tok::kw__Nonnull:
1113 case tok::kw__Nullable:
1114 case tok::kw__Nullable_result:
1115 case tok::kw__Null_unspecified: {
1116 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
1117 SourceLocation AttrNameLoc = ConsumeToken();
1118 if (!getLangOpts().ObjC)
1119 Diag(Loc: AttrNameLoc, DiagID: diag::ext_nullability)
1120 << AttrName;
1121 attrs.addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
1122 form: Kind);
1123 break;
1124 }
1125 default:
1126 return;
1127 }
1128 }
1129}
1130
1131static bool VersionNumberSeparator(const char Separator) {
1132 return (Separator == '.' || Separator == '_');
1133}
1134
1135VersionTuple Parser::ParseVersionTuple(SourceRange &Range) {
1136 Range = SourceRange(Tok.getLocation(), Tok.getEndLoc());
1137
1138 if (!Tok.is(K: tok::numeric_constant)) {
1139 Diag(Tok, DiagID: diag::err_expected_version);
1140 SkipUntil(T1: tok::comma, T2: tok::r_paren,
1141 Flags: StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
1142 return VersionTuple();
1143 }
1144
1145 // Parse the major (and possibly minor and subminor) versions, which
1146 // are stored in the numeric constant. We utilize a quirk of the
1147 // lexer, which is that it handles something like 1.2.3 as a single
1148 // numeric constant, rather than two separate tokens.
1149 SmallString<512> Buffer;
1150 Buffer.resize(N: Tok.getLength()+1);
1151 const char *ThisTokBegin = &Buffer[0];
1152
1153 // Get the spelling of the token, which eliminates trigraphs, etc.
1154 bool Invalid = false;
1155 unsigned ActualLength = PP.getSpelling(Tok, Buffer&: ThisTokBegin, Invalid: &Invalid);
1156 if (Invalid)
1157 return VersionTuple();
1158
1159 // Parse the major version.
1160 unsigned AfterMajor = 0;
1161 unsigned Major = 0;
1162 while (AfterMajor < ActualLength && isDigit(c: ThisTokBegin[AfterMajor])) {
1163 Major = Major * 10 + ThisTokBegin[AfterMajor] - '0';
1164 ++AfterMajor;
1165 }
1166
1167 if (AfterMajor == 0) {
1168 Diag(Tok, DiagID: diag::err_expected_version);
1169 SkipUntil(T1: tok::comma, T2: tok::r_paren,
1170 Flags: StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
1171 return VersionTuple();
1172 }
1173
1174 if (AfterMajor == ActualLength) {
1175 ConsumeToken();
1176
1177 // We only had a single version component.
1178 if (Major == 0) {
1179 Diag(Tok, DiagID: diag::err_zero_version);
1180 return VersionTuple();
1181 }
1182
1183 return VersionTuple(Major);
1184 }
1185
1186 const char AfterMajorSeparator = ThisTokBegin[AfterMajor];
1187 if (!VersionNumberSeparator(Separator: AfterMajorSeparator)
1188 || (AfterMajor + 1 == ActualLength)) {
1189 Diag(Tok, DiagID: diag::err_expected_version);
1190 SkipUntil(T1: tok::comma, T2: tok::r_paren,
1191 Flags: StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
1192 return VersionTuple();
1193 }
1194
1195 // Parse the minor version.
1196 unsigned AfterMinor = AfterMajor + 1;
1197 unsigned Minor = 0;
1198 while (AfterMinor < ActualLength && isDigit(c: ThisTokBegin[AfterMinor])) {
1199 Minor = Minor * 10 + ThisTokBegin[AfterMinor] - '0';
1200 ++AfterMinor;
1201 }
1202
1203 if (AfterMinor == ActualLength) {
1204 ConsumeToken();
1205
1206 // We had major.minor.
1207 if (Major == 0 && Minor == 0) {
1208 Diag(Tok, DiagID: diag::err_zero_version);
1209 return VersionTuple();
1210 }
1211
1212 return VersionTuple(Major, Minor);
1213 }
1214
1215 const char AfterMinorSeparator = ThisTokBegin[AfterMinor];
1216 // If what follows is not a '.' or '_', we have a problem.
1217 if (!VersionNumberSeparator(Separator: AfterMinorSeparator)) {
1218 Diag(Tok, DiagID: diag::err_expected_version);
1219 SkipUntil(T1: tok::comma, T2: tok::r_paren,
1220 Flags: StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
1221 return VersionTuple();
1222 }
1223
1224 // Warn if separators, be it '.' or '_', do not match.
1225 if (AfterMajorSeparator != AfterMinorSeparator)
1226 Diag(Tok, DiagID: diag::warn_expected_consistent_version_separator);
1227
1228 // Parse the subminor version.
1229 unsigned AfterSubminor = AfterMinor + 1;
1230 unsigned Subminor = 0;
1231 while (AfterSubminor < ActualLength && isDigit(c: ThisTokBegin[AfterSubminor])) {
1232 Subminor = Subminor * 10 + ThisTokBegin[AfterSubminor] - '0';
1233 ++AfterSubminor;
1234 }
1235
1236 if (AfterSubminor != ActualLength) {
1237 Diag(Tok, DiagID: diag::err_expected_version);
1238 SkipUntil(T1: tok::comma, T2: tok::r_paren,
1239 Flags: StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
1240 return VersionTuple();
1241 }
1242 ConsumeToken();
1243 return VersionTuple(Major, Minor, Subminor);
1244}
1245
1246void Parser::ParseAvailabilityAttribute(
1247 IdentifierInfo &Availability, SourceLocation AvailabilityLoc,
1248 ParsedAttributes &attrs, SourceLocation *endLoc, IdentifierInfo *ScopeName,
1249 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
1250 enum { Introduced, Deprecated, Obsoleted, Unknown };
1251 AvailabilityChange Changes[Unknown];
1252 ExprResult MessageExpr, ReplacementExpr;
1253 IdentifierLoc *EnvironmentLoc = nullptr;
1254
1255 // Opening '('.
1256 BalancedDelimiterTracker T(*this, tok::l_paren);
1257 if (T.consumeOpen()) {
1258 Diag(Tok, DiagID: diag::err_expected) << tok::l_paren;
1259 return;
1260 }
1261
1262 // Parse the platform name.
1263 if (Tok.isNot(K: tok::identifier)) {
1264 Diag(Tok, DiagID: diag::err_availability_expected_platform);
1265 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1266 return;
1267 }
1268 IdentifierLoc *Platform = ParseIdentifierLoc();
1269 if (const IdentifierInfo *const Ident = Platform->getIdentifierInfo()) {
1270 // Disallow xrOS for availability attributes.
1271 if (Ident->getName().contains(Other: "xrOS") || Ident->getName().contains(Other: "xros"))
1272 Diag(Loc: Platform->getLoc(), DiagID: diag::warn_availability_unknown_platform)
1273 << Ident;
1274 // Canonicalize platform name from "macosx" to "macos".
1275 else if (Ident->getName() == "macosx")
1276 Platform->setIdentifierInfo(PP.getIdentifierInfo(Name: "macos"));
1277 // Canonicalize platform name from "macosx_app_extension" to
1278 // "macos_app_extension".
1279 else if (Ident->getName() == "macosx_app_extension")
1280 Platform->setIdentifierInfo(PP.getIdentifierInfo(Name: "macos_app_extension"));
1281 else
1282 Platform->setIdentifierInfo(PP.getIdentifierInfo(
1283 Name: AvailabilityAttr::canonicalizePlatformName(Platform: Ident->getName())));
1284 }
1285
1286 // Parse the ',' following the platform name.
1287 if (ExpectAndConsume(ExpectedTok: tok::comma)) {
1288 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1289 return;
1290 }
1291
1292 // If we haven't grabbed the pointers for the identifiers
1293 // "introduced", "deprecated", and "obsoleted", do so now.
1294 if (!Ident_introduced) {
1295 Ident_introduced = PP.getIdentifierInfo(Name: "introduced");
1296 Ident_deprecated = PP.getIdentifierInfo(Name: "deprecated");
1297 Ident_obsoleted = PP.getIdentifierInfo(Name: "obsoleted");
1298 Ident_unavailable = PP.getIdentifierInfo(Name: "unavailable");
1299 Ident_message = PP.getIdentifierInfo(Name: "message");
1300 Ident_strict = PP.getIdentifierInfo(Name: "strict");
1301 Ident_replacement = PP.getIdentifierInfo(Name: "replacement");
1302 Ident_environment = PP.getIdentifierInfo(Name: "environment");
1303 }
1304
1305 // Parse the optional "strict", the optional "replacement" and the set of
1306 // introductions/deprecations/removals.
1307 SourceLocation UnavailableLoc, StrictLoc;
1308 do {
1309 if (Tok.isNot(K: tok::identifier)) {
1310 Diag(Tok, DiagID: diag::err_availability_expected_change);
1311 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1312 return;
1313 }
1314 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1315 SourceLocation KeywordLoc = ConsumeToken();
1316
1317 if (Keyword == Ident_strict) {
1318 if (StrictLoc.isValid()) {
1319 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_redundant)
1320 << Keyword << SourceRange(StrictLoc);
1321 }
1322 StrictLoc = KeywordLoc;
1323 continue;
1324 }
1325
1326 if (Keyword == Ident_unavailable) {
1327 if (UnavailableLoc.isValid()) {
1328 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_redundant)
1329 << Keyword << SourceRange(UnavailableLoc);
1330 }
1331 UnavailableLoc = KeywordLoc;
1332 continue;
1333 }
1334
1335 if (Keyword == Ident_deprecated && Platform->getIdentifierInfo() &&
1336 Platform->getIdentifierInfo()->isStr(Str: "swift")) {
1337 // For swift, we deprecate for all versions.
1338 if (Changes[Deprecated].KeywordLoc.isValid()) {
1339 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_redundant)
1340 << Keyword
1341 << SourceRange(Changes[Deprecated].KeywordLoc);
1342 }
1343
1344 Changes[Deprecated].KeywordLoc = KeywordLoc;
1345 // Use a fake version here.
1346 Changes[Deprecated].Version = VersionTuple(1);
1347 continue;
1348 }
1349
1350 if (Keyword == Ident_environment) {
1351 if (EnvironmentLoc != nullptr) {
1352 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_redundant)
1353 << Keyword << SourceRange(EnvironmentLoc->getLoc());
1354 }
1355 }
1356
1357 if (Tok.isNot(K: tok::equal)) {
1358 Diag(Tok, DiagID: diag::err_expected_after) << Keyword << tok::equal;
1359 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1360 return;
1361 }
1362 ConsumeToken();
1363 if (Keyword == Ident_message || Keyword == Ident_replacement) {
1364 if (!isTokenStringLiteral()) {
1365 Diag(Tok, DiagID: diag::err_expected_string_literal)
1366 << /*Source='availability attribute'*/2;
1367 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1368 return;
1369 }
1370 if (Keyword == Ident_message) {
1371 MessageExpr = ParseUnevaluatedStringLiteralExpression();
1372 break;
1373 } else {
1374 ReplacementExpr = ParseUnevaluatedStringLiteralExpression();
1375 continue;
1376 }
1377 }
1378 if (Keyword == Ident_environment) {
1379 if (Tok.isNot(K: tok::identifier)) {
1380 Diag(Tok, DiagID: diag::err_availability_expected_environment);
1381 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1382 return;
1383 }
1384 EnvironmentLoc = ParseIdentifierLoc();
1385 continue;
1386 }
1387
1388 // Special handling of 'NA' only when applied to introduced or
1389 // deprecated.
1390 if ((Keyword == Ident_introduced || Keyword == Ident_deprecated) &&
1391 Tok.is(K: tok::identifier)) {
1392 IdentifierInfo *NA = Tok.getIdentifierInfo();
1393 if (NA->getName() == "NA") {
1394 ConsumeToken();
1395 if (Keyword == Ident_introduced)
1396 UnavailableLoc = KeywordLoc;
1397 continue;
1398 }
1399 }
1400
1401 SourceRange VersionRange;
1402 VersionTuple Version = ParseVersionTuple(Range&: VersionRange);
1403
1404 if (Version.empty()) {
1405 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1406 return;
1407 }
1408
1409 unsigned Index;
1410 if (Keyword == Ident_introduced)
1411 Index = Introduced;
1412 else if (Keyword == Ident_deprecated)
1413 Index = Deprecated;
1414 else if (Keyword == Ident_obsoleted)
1415 Index = Obsoleted;
1416 else
1417 Index = Unknown;
1418
1419 if (Index < Unknown) {
1420 if (!Changes[Index].KeywordLoc.isInvalid()) {
1421 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_redundant)
1422 << Keyword
1423 << SourceRange(Changes[Index].KeywordLoc,
1424 Changes[Index].VersionRange.getEnd());
1425 }
1426
1427 Changes[Index].KeywordLoc = KeywordLoc;
1428 Changes[Index].Version = Version;
1429 Changes[Index].VersionRange = VersionRange;
1430 } else {
1431 Diag(Loc: KeywordLoc, DiagID: diag::err_availability_unknown_change)
1432 << Keyword << VersionRange;
1433 }
1434
1435 } while (TryConsumeToken(Expected: tok::comma));
1436
1437 // Closing ')'.
1438 if (T.consumeClose())
1439 return;
1440
1441 if (endLoc)
1442 *endLoc = T.getCloseLocation();
1443
1444 // The 'unavailable' availability cannot be combined with any other
1445 // availability changes. Make sure that hasn't happened.
1446 if (UnavailableLoc.isValid()) {
1447 bool Complained = false;
1448 for (unsigned Index = Introduced; Index != Unknown; ++Index) {
1449 if (Changes[Index].KeywordLoc.isValid()) {
1450 if (!Complained) {
1451 Diag(Loc: UnavailableLoc, DiagID: diag::warn_availability_and_unavailable)
1452 << SourceRange(Changes[Index].KeywordLoc,
1453 Changes[Index].VersionRange.getEnd());
1454 Complained = true;
1455 }
1456
1457 // Clear out the availability.
1458 Changes[Index] = AvailabilityChange();
1459 }
1460 }
1461 }
1462
1463 // Record this attribute
1464 attrs.addNew(attrName: &Availability,
1465 attrRange: SourceRange(AvailabilityLoc, T.getCloseLocation()),
1466 scope: AttributeScopeInfo(ScopeName, ScopeLoc), Param: Platform,
1467 introduced: Changes[Introduced], deprecated: Changes[Deprecated], obsoleted: Changes[Obsoleted],
1468 unavailable: UnavailableLoc, MessageExpr: MessageExpr.get(), form: Form, strict: StrictLoc,
1469 ReplacementExpr: ReplacementExpr.get(), EnvironmentLoc);
1470}
1471
1472void Parser::ParseExternalSourceSymbolAttribute(
1473 IdentifierInfo &ExternalSourceSymbol, SourceLocation Loc,
1474 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1475 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
1476 // Opening '('.
1477 BalancedDelimiterTracker T(*this, tok::l_paren);
1478 if (T.expectAndConsume())
1479 return;
1480
1481 // Initialize the pointers for the keyword identifiers when required.
1482 if (!Ident_language) {
1483 Ident_language = PP.getIdentifierInfo(Name: "language");
1484 Ident_defined_in = PP.getIdentifierInfo(Name: "defined_in");
1485 Ident_generated_declaration = PP.getIdentifierInfo(Name: "generated_declaration");
1486 Ident_USR = PP.getIdentifierInfo(Name: "USR");
1487 }
1488
1489 ExprResult Language;
1490 bool HasLanguage = false;
1491 ExprResult DefinedInExpr;
1492 bool HasDefinedIn = false;
1493 IdentifierLoc *GeneratedDeclaration = nullptr;
1494 ExprResult USR;
1495 bool HasUSR = false;
1496
1497 // Parse the language/defined_in/generated_declaration keywords
1498 do {
1499 if (Tok.isNot(K: tok::identifier)) {
1500 Diag(Tok, DiagID: diag::err_external_source_symbol_expected_keyword);
1501 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1502 return;
1503 }
1504
1505 SourceLocation KeywordLoc = Tok.getLocation();
1506 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1507 if (Keyword == Ident_generated_declaration) {
1508 if (GeneratedDeclaration) {
1509 Diag(Tok, DiagID: diag::err_external_source_symbol_duplicate_clause) << Keyword;
1510 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1511 return;
1512 }
1513 GeneratedDeclaration = ParseIdentifierLoc();
1514 continue;
1515 }
1516
1517 if (Keyword != Ident_language && Keyword != Ident_defined_in &&
1518 Keyword != Ident_USR) {
1519 Diag(Tok, DiagID: diag::err_external_source_symbol_expected_keyword);
1520 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1521 return;
1522 }
1523
1524 ConsumeToken();
1525 if (ExpectAndConsume(ExpectedTok: tok::equal, Diag: diag::err_expected_after,
1526 DiagMsg: Keyword->getName())) {
1527 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1528 return;
1529 }
1530
1531 bool HadLanguage = HasLanguage, HadDefinedIn = HasDefinedIn,
1532 HadUSR = HasUSR;
1533 if (Keyword == Ident_language)
1534 HasLanguage = true;
1535 else if (Keyword == Ident_USR)
1536 HasUSR = true;
1537 else
1538 HasDefinedIn = true;
1539
1540 if (!isTokenStringLiteral()) {
1541 Diag(Tok, DiagID: diag::err_expected_string_literal)
1542 << /*Source='external_source_symbol attribute'*/ 3
1543 << /*language | source container | USR*/ (
1544 Keyword == Ident_language
1545 ? 0
1546 : (Keyword == Ident_defined_in ? 1 : 2));
1547 SkipUntil(T1: tok::comma, T2: tok::r_paren, Flags: StopAtSemi | StopBeforeMatch);
1548 continue;
1549 }
1550 if (Keyword == Ident_language) {
1551 if (HadLanguage) {
1552 Diag(Loc: KeywordLoc, DiagID: diag::err_external_source_symbol_duplicate_clause)
1553 << Keyword;
1554 ParseUnevaluatedStringLiteralExpression();
1555 continue;
1556 }
1557 Language = ParseUnevaluatedStringLiteralExpression();
1558 } else if (Keyword == Ident_USR) {
1559 if (HadUSR) {
1560 Diag(Loc: KeywordLoc, DiagID: diag::err_external_source_symbol_duplicate_clause)
1561 << Keyword;
1562 ParseUnevaluatedStringLiteralExpression();
1563 continue;
1564 }
1565 USR = ParseUnevaluatedStringLiteralExpression();
1566 } else {
1567 assert(Keyword == Ident_defined_in && "Invalid clause keyword!");
1568 if (HadDefinedIn) {
1569 Diag(Loc: KeywordLoc, DiagID: diag::err_external_source_symbol_duplicate_clause)
1570 << Keyword;
1571 ParseUnevaluatedStringLiteralExpression();
1572 continue;
1573 }
1574 DefinedInExpr = ParseUnevaluatedStringLiteralExpression();
1575 }
1576 } while (TryConsumeToken(Expected: tok::comma));
1577
1578 // Closing ')'.
1579 if (T.consumeClose())
1580 return;
1581 if (EndLoc)
1582 *EndLoc = T.getCloseLocation();
1583
1584 ArgsUnion Args[] = {Language.get(), DefinedInExpr.get(), GeneratedDeclaration,
1585 USR.get()};
1586 Attrs.addNew(attrName: &ExternalSourceSymbol, attrRange: SourceRange(Loc, T.getCloseLocation()),
1587 scope: AttributeScopeInfo(ScopeName, ScopeLoc), args: Args, numArgs: std::size(Args),
1588 form: Form);
1589}
1590
1591void Parser::ParseObjCBridgeRelatedAttribute(
1592 IdentifierInfo &ObjCBridgeRelated, SourceLocation ObjCBridgeRelatedLoc,
1593 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1594 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
1595 // Opening '('.
1596 BalancedDelimiterTracker T(*this, tok::l_paren);
1597 if (T.consumeOpen()) {
1598 Diag(Tok, DiagID: diag::err_expected) << tok::l_paren;
1599 return;
1600 }
1601
1602 // Parse the related class name.
1603 if (Tok.isNot(K: tok::identifier)) {
1604 Diag(Tok, DiagID: diag::err_objcbridge_related_expected_related_class);
1605 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1606 return;
1607 }
1608 IdentifierLoc *RelatedClass = ParseIdentifierLoc();
1609 if (ExpectAndConsume(ExpectedTok: tok::comma)) {
1610 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1611 return;
1612 }
1613
1614 // Parse class method name. It's non-optional in the sense that a trailing
1615 // comma is required, but it can be the empty string, and then we record a
1616 // nullptr.
1617 IdentifierLoc *ClassMethod = nullptr;
1618 if (Tok.is(K: tok::identifier)) {
1619 ClassMethod = ParseIdentifierLoc();
1620 if (!TryConsumeToken(Expected: tok::colon)) {
1621 Diag(Tok, DiagID: diag::err_objcbridge_related_selector_name);
1622 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1623 return;
1624 }
1625 }
1626 if (!TryConsumeToken(Expected: tok::comma)) {
1627 if (Tok.is(K: tok::colon))
1628 Diag(Tok, DiagID: diag::err_objcbridge_related_selector_name);
1629 else
1630 Diag(Tok, DiagID: diag::err_expected) << tok::comma;
1631 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1632 return;
1633 }
1634
1635 // Parse instance method name. Also non-optional but empty string is
1636 // permitted.
1637 IdentifierLoc *InstanceMethod = nullptr;
1638 if (Tok.is(K: tok::identifier))
1639 InstanceMethod = ParseIdentifierLoc();
1640 else if (Tok.isNot(K: tok::r_paren)) {
1641 Diag(Tok, DiagID: diag::err_expected) << tok::r_paren;
1642 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
1643 return;
1644 }
1645
1646 // Closing ')'.
1647 if (T.consumeClose())
1648 return;
1649
1650 if (EndLoc)
1651 *EndLoc = T.getCloseLocation();
1652
1653 // Record this attribute
1654 Attrs.addNew(attrName: &ObjCBridgeRelated,
1655 attrRange: SourceRange(ObjCBridgeRelatedLoc, T.getCloseLocation()),
1656 scope: AttributeScopeInfo(ScopeName, ScopeLoc), Param1: RelatedClass,
1657 Param2: ClassMethod, Param3: InstanceMethod, form: Form);
1658}
1659
1660void Parser::ParseSwiftNewTypeAttribute(
1661 IdentifierInfo &AttrName, SourceLocation AttrNameLoc,
1662 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1663 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
1664 BalancedDelimiterTracker T(*this, tok::l_paren);
1665
1666 // Opening '('
1667 if (T.consumeOpen()) {
1668 Diag(Tok, DiagID: diag::err_expected) << tok::l_paren;
1669 return;
1670 }
1671
1672 if (Tok.is(K: tok::r_paren)) {
1673 Diag(Loc: Tok.getLocation(), DiagID: diag::err_argument_required_after_attribute);
1674 T.consumeClose();
1675 return;
1676 }
1677 if (Tok.isNot(K: tok::kw_struct) && Tok.isNot(K: tok::kw_enum)) {
1678 Diag(Tok, DiagID: diag::warn_attribute_type_not_supported)
1679 << &AttrName << Tok.getIdentifierInfo();
1680 if (!isTokenSpecial())
1681 ConsumeToken();
1682 T.consumeClose();
1683 return;
1684 }
1685
1686 auto *SwiftType = new (Actions.Context)
1687 IdentifierLoc(Tok.getLocation(), Tok.getIdentifierInfo());
1688 ConsumeToken();
1689
1690 // Closing ')'
1691 if (T.consumeClose())
1692 return;
1693 if (EndLoc)
1694 *EndLoc = T.getCloseLocation();
1695
1696 ArgsUnion Args[] = {SwiftType};
1697 Attrs.addNew(attrName: &AttrName, attrRange: SourceRange(AttrNameLoc, T.getCloseLocation()),
1698 scope: AttributeScopeInfo(ScopeName, ScopeLoc), args: Args, numArgs: std::size(Args),
1699 form: Form);
1700}
1701
1702void Parser::ParseTypeTagForDatatypeAttribute(
1703 IdentifierInfo &AttrName, SourceLocation AttrNameLoc,
1704 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1705 SourceLocation ScopeLoc, ParsedAttr::Form Form) {
1706 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
1707
1708 BalancedDelimiterTracker T(*this, tok::l_paren);
1709 T.consumeOpen();
1710
1711 if (Tok.isNot(K: tok::identifier)) {
1712 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
1713 T.skipToEnd();
1714 return;
1715 }
1716 IdentifierLoc *ArgumentKind = ParseIdentifierLoc();
1717
1718 if (ExpectAndConsume(ExpectedTok: tok::comma)) {
1719 T.skipToEnd();
1720 return;
1721 }
1722
1723 SourceRange MatchingCTypeRange;
1724 TypeResult MatchingCType = ParseTypeName(Range: &MatchingCTypeRange);
1725 if (MatchingCType.isInvalid()) {
1726 T.skipToEnd();
1727 return;
1728 }
1729
1730 bool LayoutCompatible = false;
1731 bool MustBeNull = false;
1732 while (TryConsumeToken(Expected: tok::comma)) {
1733 if (Tok.isNot(K: tok::identifier)) {
1734 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
1735 T.skipToEnd();
1736 return;
1737 }
1738 IdentifierInfo *Flag = Tok.getIdentifierInfo();
1739 if (Flag->isStr(Str: "layout_compatible"))
1740 LayoutCompatible = true;
1741 else if (Flag->isStr(Str: "must_be_null"))
1742 MustBeNull = true;
1743 else {
1744 Diag(Tok, DiagID: diag::err_type_safety_unknown_flag) << Flag;
1745 T.skipToEnd();
1746 return;
1747 }
1748 ConsumeToken(); // consume flag
1749 }
1750
1751 if (!T.consumeClose()) {
1752 Attrs.addNewTypeTagForDatatype(
1753 attrName: &AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(ScopeName, ScopeLoc),
1754 argumentKind: ArgumentKind, matchingCType: MatchingCType.get(), layoutCompatible: LayoutCompatible, mustBeNull: MustBeNull, form: Form);
1755 }
1756
1757 if (EndLoc)
1758 *EndLoc = T.getCloseLocation();
1759}
1760
1761bool Parser::DiagnoseProhibitedCXX11Attribute() {
1762 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square));
1763
1764 switch (isCXX11AttributeSpecifier(/*Disambiguate*/true)) {
1765 case CXX11AttributeKind::NotAttributeSpecifier:
1766 // No diagnostic: we're in Obj-C++11 and this is not actually an attribute.
1767 return false;
1768
1769 case CXX11AttributeKind::InvalidAttributeSpecifier:
1770 Diag(Loc: Tok.getLocation(), DiagID: diag::err_l_square_l_square_not_attribute);
1771 return false;
1772
1773 case CXX11AttributeKind::AttributeSpecifier:
1774 // Parse and discard the attributes.
1775 SourceLocation BeginLoc = ConsumeBracket();
1776 ConsumeBracket();
1777 SkipUntil(T: tok::r_square);
1778 assert(Tok.is(tok::r_square) && "isCXX11AttributeSpecifier lied");
1779 SourceLocation EndLoc = ConsumeBracket();
1780 Diag(Loc: BeginLoc, DiagID: diag::err_attributes_not_allowed)
1781 << SourceRange(BeginLoc, EndLoc);
1782 return true;
1783 }
1784 llvm_unreachable("All cases handled above.");
1785}
1786
1787void Parser::DiagnoseMisplacedCXX11Attribute(ParsedAttributes &Attrs,
1788 SourceLocation CorrectLocation) {
1789 assert((Tok.is(tok::l_square) && NextToken().is(tok::l_square)) ||
1790 Tok.is(tok::kw_alignas) || Tok.isRegularKeywordAttribute());
1791
1792 // Consume the attributes.
1793 auto Keyword =
1794 Tok.isRegularKeywordAttribute() ? Tok.getIdentifierInfo() : nullptr;
1795 SourceLocation Loc = Tok.getLocation();
1796 ParseCXX11Attributes(attrs&: Attrs);
1797 CharSourceRange AttrRange(SourceRange(Loc, Attrs.Range.getEnd()), true);
1798 // FIXME: use err_attributes_misplaced
1799 (Keyword ? Diag(Loc, DiagID: diag::err_keyword_not_allowed) << Keyword
1800 : Diag(Loc, DiagID: diag::err_attributes_not_allowed))
1801 << FixItHint::CreateInsertionFromRange(InsertionLoc: CorrectLocation, FromRange: AttrRange)
1802 << FixItHint::CreateRemoval(RemoveRange: AttrRange);
1803}
1804
1805void Parser::DiagnoseProhibitedAttributes(
1806 const ParsedAttributesView &Attrs, const SourceLocation CorrectLocation) {
1807 auto *FirstAttr = Attrs.empty() ? nullptr : &Attrs.front();
1808 if (CorrectLocation.isValid()) {
1809 CharSourceRange AttrRange(Attrs.Range, true);
1810 (FirstAttr && FirstAttr->isRegularKeywordAttribute()
1811 ? Diag(Loc: CorrectLocation, DiagID: diag::err_keyword_misplaced) << FirstAttr
1812 : Diag(Loc: CorrectLocation, DiagID: diag::err_attributes_misplaced))
1813 << FixItHint::CreateInsertionFromRange(InsertionLoc: CorrectLocation, FromRange: AttrRange)
1814 << FixItHint::CreateRemoval(RemoveRange: AttrRange);
1815 } else {
1816 const SourceRange &Range = Attrs.Range;
1817 (FirstAttr && FirstAttr->isRegularKeywordAttribute()
1818 ? Diag(Loc: Range.getBegin(), DiagID: diag::err_keyword_not_allowed) << FirstAttr
1819 : Diag(Loc: Range.getBegin(), DiagID: diag::err_attributes_not_allowed))
1820 << Range;
1821 }
1822}
1823
1824void Parser::ProhibitCXX11Attributes(ParsedAttributes &Attrs,
1825 unsigned AttrDiagID,
1826 unsigned KeywordDiagID,
1827 bool DiagnoseEmptyAttrs,
1828 bool WarnOnUnknownAttrs) {
1829
1830 if (DiagnoseEmptyAttrs && Attrs.empty() && Attrs.Range.isValid()) {
1831 // An attribute list has been parsed, but it was empty.
1832 // This is the case for [[]].
1833 const auto &LangOpts = getLangOpts();
1834 auto &SM = PP.getSourceManager();
1835 Token FirstLSquare;
1836 Lexer::getRawToken(Loc: Attrs.Range.getBegin(), Result&: FirstLSquare, SM, LangOpts);
1837
1838 if (FirstLSquare.is(K: tok::l_square)) {
1839 std::optional<Token> SecondLSquare =
1840 Lexer::findNextToken(Loc: FirstLSquare.getLocation(), SM, LangOpts);
1841
1842 if (SecondLSquare && SecondLSquare->is(K: tok::l_square)) {
1843 // The attribute range starts with [[, but is empty. So this must
1844 // be [[]], which we are supposed to diagnose because
1845 // DiagnoseEmptyAttrs is true.
1846 Diag(Loc: Attrs.Range.getBegin(), DiagID: AttrDiagID) << Attrs.Range;
1847 return;
1848 }
1849 }
1850 }
1851
1852 for (const ParsedAttr &AL : Attrs) {
1853 if (AL.isRegularKeywordAttribute()) {
1854 Diag(Loc: AL.getLoc(), DiagID: KeywordDiagID) << AL;
1855 AL.setInvalid();
1856 continue;
1857 }
1858 if (!AL.isStandardAttributeSyntax())
1859 continue;
1860 if (AL.getKind() == ParsedAttr::UnknownAttribute) {
1861 if (WarnOnUnknownAttrs) {
1862 Actions.DiagnoseUnknownAttribute(AL);
1863 AL.setInvalid();
1864 }
1865 } else {
1866 Diag(Loc: AL.getLoc(), DiagID: AttrDiagID) << AL;
1867 AL.setInvalid();
1868 }
1869 }
1870}
1871
1872void Parser::DiagnoseCXX11AttributeExtension(ParsedAttributes &Attrs) {
1873 for (const ParsedAttr &PA : Attrs) {
1874 if (PA.isStandardAttributeSyntax() || PA.isRegularKeywordAttribute())
1875 Diag(Loc: PA.getLoc(), DiagID: diag::ext_cxx11_attr_placement)
1876 << PA << PA.isRegularKeywordAttribute() << PA.getRange();
1877 }
1878}
1879
1880void Parser::stripTypeAttributesOffDeclSpec(ParsedAttributes &Attrs,
1881 DeclSpec &DS, TagUseKind TUK) {
1882 if (TUK == TagUseKind::Reference)
1883 return;
1884
1885 llvm::SmallVector<ParsedAttr *, 1> ToBeMoved;
1886
1887 for (ParsedAttr &AL : DS.getAttributes()) {
1888 if ((AL.getKind() == ParsedAttr::AT_Aligned &&
1889 AL.isDeclspecAttribute()) ||
1890 AL.isMicrosoftAttribute())
1891 ToBeMoved.push_back(Elt: &AL);
1892 }
1893
1894 for (ParsedAttr *AL : ToBeMoved) {
1895 DS.getAttributes().remove(ToBeRemoved: AL);
1896 Attrs.addAtEnd(newAttr: AL);
1897 }
1898}
1899
1900Parser::DeclGroupPtrTy Parser::ParseDeclaration(DeclaratorContext Context,
1901 SourceLocation &DeclEnd,
1902 ParsedAttributes &DeclAttrs,
1903 ParsedAttributes &DeclSpecAttrs,
1904 SourceLocation *DeclSpecStart) {
1905 ParenBraceBracketBalancer BalancerRAIIObj(*this);
1906 // Must temporarily exit the objective-c container scope for
1907 // parsing c none objective-c decls.
1908 ObjCDeclContextSwitch ObjCDC(*this);
1909
1910 Decl *SingleDecl = nullptr;
1911 switch (Tok.getKind()) {
1912 case tok::kw_template:
1913 case tok::kw_export:
1914 ProhibitAttributes(Attrs&: DeclAttrs);
1915 ProhibitAttributes(Attrs&: DeclSpecAttrs);
1916 return ParseDeclarationStartingWithTemplate(Context, DeclEnd, AccessAttrs&: DeclAttrs);
1917 case tok::kw_inline:
1918 // Could be the start of an inline namespace. Allowed as an ext in C++03.
1919 if (getLangOpts().CPlusPlus && NextToken().is(K: tok::kw_namespace)) {
1920 ProhibitAttributes(Attrs&: DeclAttrs);
1921 ProhibitAttributes(Attrs&: DeclSpecAttrs);
1922 SourceLocation InlineLoc = ConsumeToken();
1923 return ParseNamespace(Context, DeclEnd, InlineLoc);
1924 }
1925 return ParseSimpleDeclaration(Context, DeclEnd, DeclAttrs, DeclSpecAttrs,
1926 RequireSemi: true, FRI: nullptr, DeclSpecStart);
1927
1928 case tok::kw_cbuffer:
1929 case tok::kw_tbuffer:
1930 SingleDecl = ParseHLSLBuffer(DeclEnd, Attrs&: DeclAttrs);
1931 break;
1932 case tok::kw_namespace:
1933 ProhibitAttributes(Attrs&: DeclAttrs);
1934 ProhibitAttributes(Attrs&: DeclSpecAttrs);
1935 return ParseNamespace(Context, DeclEnd);
1936 case tok::kw_using: {
1937 takeAndConcatenateAttrs(First&: DeclAttrs, Second: std::move(DeclSpecAttrs));
1938 return ParseUsingDirectiveOrDeclaration(Context, TemplateInfo: ParsedTemplateInfo(),
1939 DeclEnd, Attrs&: DeclAttrs);
1940 }
1941 case tok::kw_static_assert:
1942 case tok::kw__Static_assert:
1943 ProhibitAttributes(Attrs&: DeclAttrs);
1944 ProhibitAttributes(Attrs&: DeclSpecAttrs);
1945 SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
1946 break;
1947 default:
1948 return ParseSimpleDeclaration(Context, DeclEnd, DeclAttrs, DeclSpecAttrs,
1949 RequireSemi: true, FRI: nullptr, DeclSpecStart);
1950 }
1951
1952 // This routine returns a DeclGroup, if the thing we parsed only contains a
1953 // single decl, convert it now.
1954 return Actions.ConvertDeclToDeclGroup(Ptr: SingleDecl);
1955}
1956
1957Parser::DeclGroupPtrTy Parser::ParseSimpleDeclaration(
1958 DeclaratorContext Context, SourceLocation &DeclEnd,
1959 ParsedAttributes &DeclAttrs, ParsedAttributes &DeclSpecAttrs,
1960 bool RequireSemi, ForRangeInit *FRI, SourceLocation *DeclSpecStart) {
1961 // Need to retain these for diagnostics before we add them to the DeclSepc.
1962 ParsedAttributesView OriginalDeclSpecAttrs;
1963 OriginalDeclSpecAttrs.prepend(B: DeclSpecAttrs.begin(), E: DeclSpecAttrs.end());
1964 OriginalDeclSpecAttrs.Range = DeclSpecAttrs.Range;
1965
1966 // Parse the common declaration-specifiers piece.
1967 ParsingDeclSpec DS(*this);
1968 DS.takeAttributesAppendingingFrom(attrs&: DeclSpecAttrs);
1969
1970 ParsedTemplateInfo TemplateInfo;
1971 DeclSpecContext DSContext = getDeclSpecContextFromDeclaratorContext(Context);
1972 ParseDeclarationSpecifiers(DS, TemplateInfo, AS: AS_none, DSC: DSContext);
1973
1974 // If we had a free-standing type definition with a missing semicolon, we
1975 // may get this far before the problem becomes obvious.
1976 if (DS.hasTagDefinition() &&
1977 DiagnoseMissingSemiAfterTagDefinition(DS, AS: AS_none, DSContext))
1978 return nullptr;
1979
1980 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1981 // declaration-specifiers init-declarator-list[opt] ';'
1982 if (Tok.is(K: tok::semi)) {
1983 ProhibitAttributes(Attrs&: DeclAttrs);
1984 DeclEnd = Tok.getLocation();
1985 if (RequireSemi) ConsumeToken();
1986 RecordDecl *AnonRecord = nullptr;
1987 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
1988 S: getCurScope(), AS: AS_none, DS, DeclAttrs: ParsedAttributesView::none(), AnonRecord);
1989 Actions.ActOnDefinedDeclarationSpecifier(D: TheDecl);
1990 DS.complete(D: TheDecl);
1991 if (AnonRecord) {
1992 Decl* decls[] = {AnonRecord, TheDecl};
1993 return Actions.BuildDeclaratorGroup(Group: decls);
1994 }
1995 return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
1996 }
1997
1998 if (DS.hasTagDefinition())
1999 Actions.ActOnDefinedDeclarationSpecifier(D: DS.getRepAsDecl());
2000
2001 if (DeclSpecStart)
2002 DS.SetRangeStart(*DeclSpecStart);
2003
2004 return ParseDeclGroup(DS, Context, Attrs&: DeclAttrs, TemplateInfo, DeclEnd: &DeclEnd, FRI);
2005}
2006
2007bool Parser::MightBeDeclarator(DeclaratorContext Context) {
2008 switch (Tok.getKind()) {
2009 case tok::annot_cxxscope:
2010 case tok::annot_template_id:
2011 case tok::caret:
2012 case tok::code_completion:
2013 case tok::coloncolon:
2014 case tok::ellipsis:
2015 case tok::kw___attribute:
2016 case tok::kw_operator:
2017 case tok::l_paren:
2018 case tok::star:
2019 return true;
2020
2021 case tok::amp:
2022 case tok::ampamp:
2023 return getLangOpts().CPlusPlus;
2024
2025 case tok::l_square: // Might be an attribute on an unnamed bit-field.
2026 return Context == DeclaratorContext::Member && getLangOpts().CPlusPlus11 &&
2027 NextToken().is(K: tok::l_square);
2028
2029 case tok::colon: // Might be a typo for '::' or an unnamed bit-field.
2030 return Context == DeclaratorContext::Member || getLangOpts().CPlusPlus;
2031
2032 case tok::identifier:
2033 switch (NextToken().getKind()) {
2034 case tok::code_completion:
2035 case tok::coloncolon:
2036 case tok::comma:
2037 case tok::equal:
2038 case tok::equalequal: // Might be a typo for '='.
2039 case tok::kw_alignas:
2040 case tok::kw_asm:
2041 case tok::kw___attribute:
2042 case tok::l_brace:
2043 case tok::l_paren:
2044 case tok::l_square:
2045 case tok::less:
2046 case tok::r_brace:
2047 case tok::r_paren:
2048 case tok::r_square:
2049 case tok::semi:
2050 return true;
2051
2052 case tok::colon:
2053 // At namespace scope, 'identifier:' is probably a typo for 'identifier::'
2054 // and in block scope it's probably a label. Inside a class definition,
2055 // this is a bit-field.
2056 return Context == DeclaratorContext::Member ||
2057 (getLangOpts().CPlusPlus && Context == DeclaratorContext::File);
2058
2059 case tok::identifier: // Possible virt-specifier.
2060 return getLangOpts().CPlusPlus11 && isCXX11VirtSpecifier(Tok: NextToken());
2061
2062 default:
2063 return Tok.isRegularKeywordAttribute();
2064 }
2065
2066 default:
2067 return Tok.isRegularKeywordAttribute();
2068 }
2069}
2070
2071void Parser::SkipMalformedDecl() {
2072 while (true) {
2073 switch (Tok.getKind()) {
2074 case tok::l_brace:
2075 // Skip until matching }, then stop. We've probably skipped over
2076 // a malformed class or function definition or similar.
2077 ConsumeBrace();
2078 SkipUntil(T: tok::r_brace);
2079 if (Tok.isOneOf(Ks: tok::comma, Ks: tok::l_brace, Ks: tok::kw_try)) {
2080 // This declaration isn't over yet. Keep skipping.
2081 continue;
2082 }
2083 TryConsumeToken(Expected: tok::semi);
2084 return;
2085
2086 case tok::l_square:
2087 ConsumeBracket();
2088 SkipUntil(T: tok::r_square);
2089 continue;
2090
2091 case tok::l_paren:
2092 ConsumeParen();
2093 SkipUntil(T: tok::r_paren);
2094 continue;
2095
2096 case tok::r_brace:
2097 return;
2098
2099 case tok::semi:
2100 ConsumeToken();
2101 return;
2102
2103 case tok::kw_inline:
2104 // 'inline namespace' at the start of a line is almost certainly
2105 // a good place to pick back up parsing, except in an Objective-C
2106 // @interface context.
2107 if (Tok.isAtStartOfLine() && NextToken().is(K: tok::kw_namespace) &&
2108 (!ParsingInObjCContainer || CurParsedObjCImpl))
2109 return;
2110 break;
2111
2112 case tok::kw_extern:
2113 // 'extern' at the start of a line is almost certainly a good
2114 // place to pick back up parsing
2115 case tok::kw_namespace:
2116 // 'namespace' at the start of a line is almost certainly a good
2117 // place to pick back up parsing, except in an Objective-C
2118 // @interface context.
2119 if (Tok.isAtStartOfLine() &&
2120 (!ParsingInObjCContainer || CurParsedObjCImpl))
2121 return;
2122 break;
2123
2124 case tok::at:
2125 // @end is very much like } in Objective-C contexts.
2126 if (NextToken().isObjCAtKeyword(objcKey: tok::objc_end) &&
2127 ParsingInObjCContainer)
2128 return;
2129 break;
2130
2131 case tok::minus:
2132 case tok::plus:
2133 // - and + probably start new method declarations in Objective-C contexts.
2134 if (Tok.isAtStartOfLine() && ParsingInObjCContainer)
2135 return;
2136 break;
2137
2138 case tok::eof:
2139 case tok::annot_module_begin:
2140 case tok::annot_module_end:
2141 case tok::annot_module_include:
2142 case tok::annot_repl_input_end:
2143 return;
2144
2145 default:
2146 break;
2147 }
2148
2149 ConsumeAnyToken();
2150 }
2151}
2152
2153Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS,
2154 DeclaratorContext Context,
2155 ParsedAttributes &Attrs,
2156 ParsedTemplateInfo &TemplateInfo,
2157 SourceLocation *DeclEnd,
2158 ForRangeInit *FRI) {
2159 // Parse the first declarator.
2160 // Consume all of the attributes from `Attrs` by moving them to our own local
2161 // list. This ensures that we will not attempt to interpret them as statement
2162 // attributes higher up the callchain.
2163 ParsedAttributes LocalAttrs(AttrFactory);
2164 LocalAttrs.takeAllPrependingFrom(Other&: Attrs);
2165 ParsingDeclarator D(*this, DS, LocalAttrs, Context);
2166 if (TemplateInfo.TemplateParams)
2167 D.setTemplateParameterLists(*TemplateInfo.TemplateParams);
2168
2169 bool IsTemplateSpecOrInst =
2170 (TemplateInfo.Kind == ParsedTemplateKind::ExplicitInstantiation ||
2171 TemplateInfo.Kind == ParsedTemplateKind::ExplicitSpecialization);
2172 SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);
2173
2174 ParseDeclarator(D);
2175
2176 if (IsTemplateSpecOrInst)
2177 SAC.done();
2178
2179 // Bail out if the first declarator didn't seem well-formed.
2180 if (!D.hasName() && !D.mayOmitIdentifier()) {
2181 SkipMalformedDecl();
2182 return nullptr;
2183 }
2184
2185 if (getLangOpts().HLSL)
2186 while (MaybeParseHLSLAnnotations(D))
2187 ;
2188
2189 if (Tok.is(K: tok::kw_requires)) {
2190 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
2191 // With abbreviated function templates - we need to explicitly add depth to
2192 // account for the implicit template parameter list induced by the template.
2193 if (!TemplateInfo.TemplateParams && D.getInventedTemplateParameterList())
2194 ++CurTemplateDepthTracker;
2195 ParseTrailingRequiresClauseWithScope(D);
2196 }
2197
2198 // Save late-parsed attributes for now; they need to be parsed in the
2199 // appropriate function scope after the function Decl has been constructed.
2200 // These will be parsed in ParseFunctionDefinition or ParseLexedAttrList.
2201 LateParsedAttrList LateParsedAttrs(true);
2202 if (D.isFunctionDeclarator()) {
2203 MaybeParseGNUAttributes(D, LateAttrs: &LateParsedAttrs);
2204
2205 // The _Noreturn keyword can't appear here, unlike the GNU noreturn
2206 // attribute. If we find the keyword here, tell the user to put it
2207 // at the start instead.
2208 if (Tok.is(K: tok::kw__Noreturn)) {
2209 SourceLocation Loc = ConsumeToken();
2210 const char *PrevSpec;
2211 unsigned DiagID;
2212
2213 // We can offer a fixit if it's valid to mark this function as _Noreturn
2214 // and we don't have any other declarators in this declaration.
2215 bool Fixit = !DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
2216 MaybeParseGNUAttributes(D, LateAttrs: &LateParsedAttrs);
2217 Fixit &= Tok.isOneOf(Ks: tok::semi, Ks: tok::l_brace, Ks: tok::kw_try);
2218
2219 Diag(Loc, DiagID: diag::err_c11_noreturn_misplaced)
2220 << (Fixit ? FixItHint::CreateRemoval(RemoveRange: Loc) : FixItHint())
2221 << (Fixit ? FixItHint::CreateInsertion(InsertionLoc: D.getBeginLoc(), Code: "_Noreturn ")
2222 : FixItHint());
2223 }
2224
2225 // Check to see if we have a function *definition* which must have a body.
2226 if (Tok.is(K: tok::equal) && NextToken().is(K: tok::code_completion)) {
2227 cutOffParsing();
2228 Actions.CodeCompletion().CodeCompleteAfterFunctionEquals(D);
2229 return nullptr;
2230 }
2231 // We're at the point where the parsing of function declarator is finished.
2232 //
2233 // A common error is that users accidently add a virtual specifier
2234 // (e.g. override) in an out-line method definition.
2235 // We attempt to recover by stripping all these specifiers coming after
2236 // the declarator.
2237 while (auto Specifier = isCXX11VirtSpecifier()) {
2238 Diag(Tok, DiagID: diag::err_virt_specifier_outside_class)
2239 << VirtSpecifiers::getSpecifierName(VS: Specifier)
2240 << FixItHint::CreateRemoval(RemoveRange: Tok.getLocation());
2241 ConsumeToken();
2242 }
2243 // Look at the next token to make sure that this isn't a function
2244 // declaration. We have to check this because __attribute__ might be the
2245 // start of a function definition in GCC-extended K&R C.
2246 if (!isDeclarationAfterDeclarator()) {
2247
2248 // Function definitions are only allowed at file scope and in C++ classes.
2249 // The C++ inline method definition case is handled elsewhere, so we only
2250 // need to handle the file scope definition case.
2251 if (Context == DeclaratorContext::File) {
2252 if (isStartOfFunctionDefinition(Declarator: D)) {
2253 // C++23 [dcl.typedef] p1:
2254 // The typedef specifier shall not be [...], and it shall not be
2255 // used in the decl-specifier-seq of a parameter-declaration nor in
2256 // the decl-specifier-seq of a function-definition.
2257 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
2258 // If the user intended to write 'typename', we should have already
2259 // suggested adding it elsewhere. In any case, recover by ignoring
2260 // 'typedef' and suggest removing it.
2261 Diag(Loc: DS.getStorageClassSpecLoc(),
2262 DiagID: diag::err_function_declared_typedef)
2263 << FixItHint::CreateRemoval(RemoveRange: DS.getStorageClassSpecLoc());
2264 DS.ClearStorageClassSpecs();
2265 }
2266 Decl *TheDecl = nullptr;
2267
2268 if (TemplateInfo.Kind == ParsedTemplateKind::ExplicitInstantiation) {
2269 if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) {
2270 // If the declarator-id is not a template-id, issue a diagnostic
2271 // and recover by ignoring the 'template' keyword.
2272 Diag(Tok, DiagID: diag::err_template_defn_explicit_instantiation) << 0;
2273 TheDecl = ParseFunctionDefinition(D, TemplateInfo: ParsedTemplateInfo(),
2274 LateParsedAttrs: &LateParsedAttrs);
2275 } else {
2276 SourceLocation LAngleLoc =
2277 PP.getLocForEndOfToken(Loc: TemplateInfo.TemplateLoc);
2278 Diag(Loc: D.getIdentifierLoc(),
2279 DiagID: diag::err_explicit_instantiation_with_definition)
2280 << SourceRange(TemplateInfo.TemplateLoc)
2281 << FixItHint::CreateInsertion(InsertionLoc: LAngleLoc, Code: "<>");
2282
2283 // Recover as if it were an explicit specialization.
2284 TemplateParameterLists FakedParamLists;
2285 FakedParamLists.push_back(Elt: Actions.ActOnTemplateParameterList(
2286 Depth: 0, ExportLoc: SourceLocation(), TemplateLoc: TemplateInfo.TemplateLoc, LAngleLoc, Params: {},
2287 RAngleLoc: LAngleLoc, RequiresClause: nullptr));
2288
2289 TheDecl = ParseFunctionDefinition(
2290 D,
2291 TemplateInfo: ParsedTemplateInfo(&FakedParamLists,
2292 /*isSpecialization=*/true,
2293 /*lastParameterListWasEmpty=*/true),
2294 LateParsedAttrs: &LateParsedAttrs);
2295 }
2296 } else {
2297 TheDecl =
2298 ParseFunctionDefinition(D, TemplateInfo, LateParsedAttrs: &LateParsedAttrs);
2299 }
2300
2301 return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
2302 }
2303
2304 if (isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No) ||
2305 Tok.is(K: tok::kw_namespace)) {
2306 // If there is an invalid declaration specifier or a namespace
2307 // definition right after the function prototype, then we must be in a
2308 // missing semicolon case where this isn't actually a body. Just fall
2309 // through into the code that handles it as a prototype, and let the
2310 // top-level code handle the erroneous declspec where it would
2311 // otherwise expect a comma or semicolon. Note that
2312 // isDeclarationSpecifier already covers 'inline namespace', since
2313 // 'inline' can be a declaration specifier.
2314 } else {
2315 Diag(Tok, DiagID: diag::err_expected_fn_body);
2316 SkipUntil(T: tok::semi);
2317 return nullptr;
2318 }
2319 } else {
2320 if (Tok.is(K: tok::l_brace)) {
2321 Diag(Tok, DiagID: diag::err_function_definition_not_allowed);
2322 SkipMalformedDecl();
2323 return nullptr;
2324 }
2325 }
2326 }
2327 }
2328
2329 if (ParseAsmAttributesAfterDeclarator(D))
2330 return nullptr;
2331
2332 // C++0x [stmt.iter]p1: Check if we have a for-range-declarator. If so, we
2333 // must parse and analyze the for-range-initializer before the declaration is
2334 // analyzed.
2335 //
2336 // Handle the Objective-C for-in loop variable similarly, although we
2337 // don't need to parse the container in advance.
2338 if (FRI && (Tok.is(K: tok::colon) || isTokIdentifier_in())) {
2339 // If we're parsing an expansion statement, enter its context to ensure
2340 // the declaration ends up in a dependent context. We previously left the
2341 // context of the expansion statement because init-statements should *not*
2342 // be in a dependent context, and only once we get here do we know that this
2343 // is not an init-statement but rather a for-range-declaration.
2344 //
2345 // Note that this is *not* the case if we get here via ParseCXXCondition()
2346 // since if that is called when we parse an expansion statement, we know for
2347 // sure that it has to be the for-range-declaration.
2348 //
2349 // We can't use ContextRAII here since that pushes a new delayed diagnostics
2350 // pool, which causes issues during declaration parsing.
2351 bool EnterContext = FRI->ExpansionStmt &&
2352 Actions.CurContext == FRI->ExpansionStmt->getParent();
2353 if (EnterContext)
2354 Actions.PushDeclContext(S: nullptr, DC: FRI->ExpansionStmt);
2355 llvm::scope_exit RestoreDeclContext{[&] {
2356 if (EnterContext)
2357 Actions.PopDeclContext();
2358 }};
2359
2360 bool IsForRangeLoopOrExpansionStmt = false;
2361 if (TryConsumeToken(Expected: tok::colon, Loc&: FRI->ColonLoc)) {
2362 IsForRangeLoopOrExpansionStmt = true;
2363 if (getLangOpts().OpenMP && !FRI->ExpansionStmt)
2364 Actions.OpenMP().startOpenMPCXXRangeFor();
2365
2366 ParseForRangeInitializerAfterColon(FRI&: *FRI, VarDeclSpec: &DS);
2367 }
2368
2369 Decl *ThisDecl = Actions.ActOnDeclarator(S: getCurScope(), D);
2370 if (IsForRangeLoopOrExpansionStmt) {
2371 Actions.ActOnCXXForRangeDecl(D: ThisDecl, InExpansionStmt: FRI->ExpansionStmt);
2372 } else {
2373 // Obj-C for loop
2374 if (auto *VD = dyn_cast_or_null<VarDecl>(Val: ThisDecl))
2375 VD->setObjCForDecl(true);
2376 }
2377 Actions.FinalizeDeclaration(D: ThisDecl);
2378 D.complete(D: ThisDecl);
2379 return Actions.FinalizeDeclaratorGroup(S: getCurScope(), DS, Group: ThisDecl);
2380 }
2381
2382 SmallVector<Decl *, 8> DeclsInGroup;
2383 Decl *FirstDecl =
2384 ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo, FRI);
2385 if (LateParsedAttrs.size() > 0)
2386 ParseLexedAttributeList(LAs&: LateParsedAttrs, D: FirstDecl, EnterScope: true, OnDefinition: false);
2387 D.complete(D: FirstDecl);
2388 if (FirstDecl)
2389 DeclsInGroup.push_back(Elt: FirstDecl);
2390
2391 bool ExpectSemi = Context != DeclaratorContext::ForInit;
2392
2393 // If we don't have a comma, it is either the end of the list (a ';') or an
2394 // error, bail out.
2395 SourceLocation CommaLoc;
2396 while (TryConsumeToken(Expected: tok::comma, Loc&: CommaLoc)) {
2397 if (Tok.isAtStartOfLine() && ExpectSemi && !MightBeDeclarator(Context)) {
2398 // This comma was followed by a line-break and something which can't be
2399 // the start of a declarator. The comma was probably a typo for a
2400 // semicolon.
2401 Diag(Loc: CommaLoc, DiagID: diag::err_expected_semi_declaration)
2402 << FixItHint::CreateReplacement(RemoveRange: CommaLoc, Code: ";");
2403 ExpectSemi = false;
2404 break;
2405 }
2406
2407 // C++23 [temp.pre]p5:
2408 // In a template-declaration, explicit specialization, or explicit
2409 // instantiation the init-declarator-list in the declaration shall
2410 // contain at most one declarator.
2411 if (TemplateInfo.Kind != ParsedTemplateKind::NonTemplate &&
2412 D.isFirstDeclarator()) {
2413 Diag(Loc: CommaLoc, DiagID: diag::err_multiple_template_declarators)
2414 << TemplateInfo.Kind;
2415 }
2416
2417 // Parse the next declarator.
2418 D.clear();
2419 D.setCommaLoc(CommaLoc);
2420
2421 // Accept attributes in an init-declarator. In the first declarator in a
2422 // declaration, these would be part of the declspec. In subsequent
2423 // declarators, they become part of the declarator itself, so that they
2424 // don't apply to declarators after *this* one. Examples:
2425 // short __attribute__((common)) var; -> declspec
2426 // short var __attribute__((common)); -> declarator
2427 // short x, __attribute__((common)) var; -> declarator
2428 MaybeParseGNUAttributes(D);
2429
2430 // MSVC parses but ignores qualifiers after the comma as an extension.
2431 if (getLangOpts().MicrosoftExt)
2432 DiagnoseAndSkipExtendedMicrosoftTypeAttributes();
2433
2434 ParseDeclarator(D);
2435
2436 if (getLangOpts().HLSL)
2437 MaybeParseHLSLAnnotations(D);
2438
2439 if (!D.isInvalidType()) {
2440 // C++2a [dcl.decl]p1
2441 // init-declarator:
2442 // declarator initializer[opt]
2443 // declarator requires-clause
2444 if (Tok.is(K: tok::kw_requires))
2445 ParseTrailingRequiresClauseWithScope(D);
2446 Decl *ThisDecl = ParseDeclarationAfterDeclarator(D, TemplateInfo);
2447 D.complete(D: ThisDecl);
2448 if (ThisDecl)
2449 DeclsInGroup.push_back(Elt: ThisDecl);
2450 }
2451 }
2452
2453 if (DeclEnd)
2454 *DeclEnd = Tok.getLocation();
2455
2456 if (ExpectSemi && ExpectAndConsumeSemi(
2457 DiagID: Context == DeclaratorContext::File
2458 ? diag::err_invalid_token_after_toplevel_declarator
2459 : diag::err_expected_semi_declaration)) {
2460 // Okay, there was no semicolon and one was expected. If we see a
2461 // declaration specifier, just assume it was missing and continue parsing.
2462 // Otherwise things are very confused and we skip to recover.
2463 if (!isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No))
2464 SkipMalformedDecl();
2465 }
2466
2467 return Actions.FinalizeDeclaratorGroup(S: getCurScope(), DS, Group: DeclsInGroup);
2468}
2469
2470bool Parser::ParseAsmAttributesAfterDeclarator(Declarator &D) {
2471 // If a simple-asm-expr is present, parse it.
2472 if (Tok.is(K: tok::kw_asm)) {
2473 SourceLocation Loc;
2474 ExprResult AsmLabel(ParseSimpleAsm(/*ForAsmLabel*/ true, EndLoc: &Loc));
2475 if (AsmLabel.isInvalid()) {
2476 SkipUntil(T: tok::semi, Flags: StopBeforeMatch);
2477 return true;
2478 }
2479
2480 D.setAsmLabel(AsmLabel.get());
2481 D.SetRangeEnd(Loc);
2482 }
2483
2484 MaybeParseGNUAttributes(D);
2485 return false;
2486}
2487
2488Decl *Parser::ParseDeclarationAfterDeclarator(
2489 Declarator &D, const ParsedTemplateInfo &TemplateInfo) {
2490 if (ParseAsmAttributesAfterDeclarator(D))
2491 return nullptr;
2492
2493 return ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo);
2494}
2495
2496Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes(
2497 Declarator &D, const ParsedTemplateInfo &TemplateInfo, ForRangeInit *FRI) {
2498 // RAII type used to track whether we're inside an initializer.
2499 struct InitializerScopeRAII {
2500 Parser &P;
2501 Declarator &D;
2502 Decl *ThisDecl;
2503 bool Entered;
2504
2505 InitializerScopeRAII(Parser &P, Declarator &D, Decl *ThisDecl)
2506 : P(P), D(D), ThisDecl(ThisDecl), Entered(false) {
2507 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2508 Scope *S = nullptr;
2509 if (D.getCXXScopeSpec().isSet()) {
2510 P.EnterScope(ScopeFlags: 0);
2511 S = P.getCurScope();
2512 }
2513 if (ThisDecl && !ThisDecl->isInvalidDecl()) {
2514 P.Actions.ActOnCXXEnterDeclInitializer(S, Dcl: ThisDecl);
2515 Entered = true;
2516 }
2517 }
2518 }
2519 ~InitializerScopeRAII() {
2520 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2521 Scope *S = nullptr;
2522 if (D.getCXXScopeSpec().isSet())
2523 S = P.getCurScope();
2524
2525 if (Entered)
2526 P.Actions.ActOnCXXExitDeclInitializer(S, Dcl: ThisDecl);
2527 if (S)
2528 P.ExitScope();
2529 }
2530 ThisDecl = nullptr;
2531 }
2532 };
2533
2534 enum class InitKind { Uninitialized, Equal, CXXDirect, CXXBraced };
2535 InitKind TheInitKind;
2536 // If a '==' or '+=' is found, suggest a fixit to '='.
2537 if (isTokenEqualOrEqualTypo())
2538 TheInitKind = InitKind::Equal;
2539 else if (Tok.is(K: tok::l_paren))
2540 TheInitKind = InitKind::CXXDirect;
2541 else if (getLangOpts().CPlusPlus11 && Tok.is(K: tok::l_brace) &&
2542 (!CurParsedObjCImpl || !D.isFunctionDeclarator()))
2543 TheInitKind = InitKind::CXXBraced;
2544 else
2545 TheInitKind = InitKind::Uninitialized;
2546 if (TheInitKind != InitKind::Uninitialized)
2547 D.setHasInitializer();
2548
2549 // Inform Sema that we just parsed this declarator.
2550 Decl *ThisDecl = nullptr;
2551 Decl *OuterDecl = nullptr;
2552 switch (TemplateInfo.Kind) {
2553 case ParsedTemplateKind::NonTemplate:
2554 ThisDecl = Actions.ActOnDeclarator(S: getCurScope(), D);
2555 break;
2556
2557 case ParsedTemplateKind::Template:
2558 case ParsedTemplateKind::ExplicitSpecialization: {
2559 ThisDecl = Actions.ActOnTemplateDeclarator(S: getCurScope(),
2560 TemplateParameterLists: *TemplateInfo.TemplateParams,
2561 D);
2562 if (VarTemplateDecl *VT = dyn_cast_or_null<VarTemplateDecl>(Val: ThisDecl)) {
2563 // Re-direct this decl to refer to the templated decl so that we can
2564 // initialize it.
2565 ThisDecl = VT->getTemplatedDecl();
2566 OuterDecl = VT;
2567 }
2568 break;
2569 }
2570 case ParsedTemplateKind::ExplicitInstantiation: {
2571 if (Tok.is(K: tok::semi)) {
2572 DeclResult ThisRes = Actions.ActOnExplicitInstantiation(
2573 S: getCurScope(), ExternLoc: TemplateInfo.ExternLoc, TemplateLoc: TemplateInfo.TemplateLoc, D);
2574 if (ThisRes.isInvalid()) {
2575 SkipUntil(T: tok::semi, Flags: StopBeforeMatch);
2576 return nullptr;
2577 }
2578 ThisDecl = ThisRes.get();
2579 } else {
2580 // FIXME: This check should be for a variable template instantiation only.
2581
2582 // Check that this is a valid instantiation
2583 if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) {
2584 // If the declarator-id is not a template-id, issue a diagnostic and
2585 // recover by ignoring the 'template' keyword.
2586 Diag(Tok, DiagID: diag::err_template_defn_explicit_instantiation)
2587 << 2 << FixItHint::CreateRemoval(RemoveRange: TemplateInfo.TemplateLoc);
2588 ThisDecl = Actions.ActOnDeclarator(S: getCurScope(), D);
2589 } else {
2590 SourceLocation LAngleLoc =
2591 PP.getLocForEndOfToken(Loc: TemplateInfo.TemplateLoc);
2592 Diag(Loc: D.getIdentifierLoc(),
2593 DiagID: diag::err_explicit_instantiation_with_definition)
2594 << SourceRange(TemplateInfo.TemplateLoc)
2595 << FixItHint::CreateInsertion(InsertionLoc: LAngleLoc, Code: "<>");
2596
2597 // Recover as if it were an explicit specialization.
2598 TemplateParameterLists FakedParamLists;
2599 FakedParamLists.push_back(Elt: Actions.ActOnTemplateParameterList(
2600 Depth: 0, ExportLoc: SourceLocation(), TemplateLoc: TemplateInfo.TemplateLoc, LAngleLoc, Params: {},
2601 RAngleLoc: LAngleLoc, RequiresClause: nullptr));
2602
2603 ThisDecl =
2604 Actions.ActOnTemplateDeclarator(S: getCurScope(), TemplateParameterLists: FakedParamLists, D);
2605 }
2606 }
2607 break;
2608 }
2609 }
2610
2611 SemaCUDA::CUDATargetContextRAII X(Actions.CUDA(),
2612 SemaCUDA::CTCK_InitGlobalVar, ThisDecl);
2613 switch (TheInitKind) {
2614 // Parse declarator '=' initializer.
2615 case InitKind::Equal: {
2616 SourceLocation EqualLoc = ConsumeToken();
2617
2618 if (Tok.is(K: tok::kw_delete)) {
2619 if (D.isFunctionDeclarator())
2620 Diag(Loc: ConsumeToken(), DiagID: diag::err_default_delete_in_multiple_declaration)
2621 << 1 /* delete */;
2622 else
2623 Diag(Loc: ConsumeToken(), DiagID: diag::err_deleted_non_function);
2624 SkipDeletedFunctionBody();
2625 } else if (Tok.is(K: tok::kw_default)) {
2626 if (D.isFunctionDeclarator())
2627 Diag(Loc: ConsumeToken(), DiagID: diag::err_default_delete_in_multiple_declaration)
2628 << 0 /* default */;
2629 else
2630 Diag(Loc: ConsumeToken(), DiagID: diag::err_default_special_members)
2631 << getLangOpts().CPlusPlus20;
2632 } else {
2633 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2634
2635 if (Tok.is(K: tok::code_completion)) {
2636 cutOffParsing();
2637 Actions.CodeCompletion().CodeCompleteInitializer(S: getCurScope(),
2638 D: ThisDecl);
2639 Actions.FinalizeDeclaration(D: ThisDecl);
2640 return nullptr;
2641 }
2642
2643 PreferredType.enterVariableInit(Tok: Tok.getLocation(), D: ThisDecl);
2644 ExprResult Init = ParseInitializer(DeclForInitializer: ThisDecl);
2645
2646 // If this is the only decl in (possibly) range based for statement,
2647 // our best guess is that the user meant ':' instead of '='.
2648 if (Tok.is(K: tok::r_paren) && FRI && D.isFirstDeclarator()) {
2649 Diag(Loc: EqualLoc, DiagID: diag::err_single_decl_assign_in_for_range)
2650 << FixItHint::CreateReplacement(RemoveRange: EqualLoc, Code: ":");
2651 // We are trying to stop parser from looking for ';' in this for
2652 // statement, therefore preventing spurious errors to be issued.
2653 FRI->ColonLoc = EqualLoc;
2654 Init = ExprError();
2655 FRI->RangeExpr = Init;
2656 }
2657
2658 if (Init.isInvalid()) {
2659 SmallVector<tok::TokenKind, 2> StopTokens;
2660 StopTokens.push_back(Elt: tok::comma);
2661 if (D.getContext() == DeclaratorContext::ForInit ||
2662 D.getContext() == DeclaratorContext::SelectionInit)
2663 StopTokens.push_back(Elt: tok::r_paren);
2664 SkipUntil(Toks: StopTokens, Flags: StopAtSemi | StopBeforeMatch);
2665 Actions.ActOnInitializerError(Dcl: ThisDecl);
2666 } else
2667 Actions.AddInitializerToDecl(dcl: ThisDecl, init: Init.get(),
2668 /*DirectInit=*/false);
2669 }
2670 break;
2671 }
2672 case InitKind::CXXDirect: {
2673 // Parse C++ direct initializer: '(' expression-list ')'
2674 BalancedDelimiterTracker T(*this, tok::l_paren);
2675 T.consumeOpen();
2676
2677 ExprVector Exprs;
2678
2679 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2680
2681 auto ThisVarDecl = dyn_cast_or_null<VarDecl>(Val: ThisDecl);
2682 auto RunSignatureHelp = [&]() {
2683 QualType PreferredType =
2684 Actions.CodeCompletion().ProduceConstructorSignatureHelp(
2685 Type: ThisVarDecl->getType()->getCanonicalTypeInternal(),
2686 Loc: ThisDecl->getLocation(), Args: Exprs, OpenParLoc: T.getOpenLocation(),
2687 /*Braced=*/false);
2688 CalledSignatureHelp = true;
2689 return PreferredType;
2690 };
2691 auto SetPreferredType = [&] {
2692 PreferredType.enterFunctionArgument(Tok: Tok.getLocation(), ComputeType: RunSignatureHelp);
2693 };
2694
2695 llvm::function_ref<void()> ExpressionStarts;
2696 if (ThisVarDecl) {
2697 // ParseExpressionList can sometimes succeed even when ThisDecl is not
2698 // VarDecl. This is an error and it is reported in a call to
2699 // Actions.ActOnInitializerError(). However, we call
2700 // ProduceConstructorSignatureHelp only on VarDecls.
2701 ExpressionStarts = SetPreferredType;
2702 }
2703
2704 bool SawError = ParseExpressionList(Exprs, ExpressionStarts);
2705
2706 if (SawError) {
2707 if (ThisVarDecl && PP.isCodeCompletionReached() && !CalledSignatureHelp) {
2708 Actions.CodeCompletion().ProduceConstructorSignatureHelp(
2709 Type: ThisVarDecl->getType()->getCanonicalTypeInternal(),
2710 Loc: ThisDecl->getLocation(), Args: Exprs, OpenParLoc: T.getOpenLocation(),
2711 /*Braced=*/false);
2712 CalledSignatureHelp = true;
2713 }
2714 Actions.ActOnInitializerError(Dcl: ThisDecl);
2715 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
2716 } else {
2717 // Match the ')'.
2718 T.consumeClose();
2719
2720 ExprResult Initializer = Actions.ActOnParenListExpr(L: T.getOpenLocation(),
2721 R: T.getCloseLocation(),
2722 Val: Exprs);
2723 Actions.AddInitializerToDecl(dcl: ThisDecl, init: Initializer.get(),
2724 /*DirectInit=*/true);
2725 }
2726 break;
2727 }
2728 case InitKind::CXXBraced: {
2729 // Parse C++0x braced-init-list.
2730 Diag(Tok, DiagID: diag::warn_cxx98_compat_generalized_initializer_lists);
2731
2732 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2733
2734 PreferredType.enterVariableInit(Tok: Tok.getLocation(), D: ThisDecl);
2735 ExprResult Init(ParseBraceInitializer());
2736
2737 if (Init.isInvalid()) {
2738 Actions.ActOnInitializerError(Dcl: ThisDecl);
2739 } else
2740 Actions.AddInitializerToDecl(dcl: ThisDecl, init: Init.get(), /*DirectInit=*/true);
2741 break;
2742 }
2743 case InitKind::Uninitialized: {
2744 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2745 Actions.ActOnUninitializedDecl(dcl: ThisDecl);
2746 break;
2747 }
2748 }
2749
2750 Actions.FinalizeDeclaration(D: ThisDecl);
2751 return OuterDecl ? OuterDecl : ThisDecl;
2752}
2753
2754void Parser::ParseSpecifierQualifierList(
2755 DeclSpec &DS, ImplicitTypenameContext AllowImplicitTypename,
2756 AccessSpecifier AS, DeclSpecContext DSC) {
2757 ParsedTemplateInfo TemplateInfo;
2758 /// specifier-qualifier-list is a subset of declaration-specifiers. Just
2759 /// parse declaration-specifiers and complain about extra stuff.
2760 /// TODO: diagnose attribute-specifiers and alignment-specifiers.
2761 ParseDeclarationSpecifiers(DS, TemplateInfo, AS, DSC, LateAttrs: nullptr,
2762 AllowImplicitTypename);
2763
2764 // Validate declspec for type-name.
2765 unsigned Specs = DS.getParsedSpecifiers();
2766 if (isTypeSpecifier(DSC) && !DS.hasTypeSpecifier()) {
2767 Diag(Tok, DiagID: diag::err_expected_type);
2768 DS.SetTypeSpecError();
2769 } else if (Specs == DeclSpec::PQ_None && !DS.hasAttributes()) {
2770 Diag(Tok, DiagID: diag::err_typename_requires_specqual);
2771 if (!DS.hasTypeSpecifier())
2772 DS.SetTypeSpecError();
2773 }
2774
2775 // Issue diagnostic and remove storage class if present.
2776 if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
2777 if (DS.getStorageClassSpecLoc().isValid())
2778 Diag(Loc: DS.getStorageClassSpecLoc(),DiagID: diag::err_typename_invalid_storageclass);
2779 else
2780 Diag(Loc: DS.getThreadStorageClassSpecLoc(),
2781 DiagID: diag::err_typename_invalid_storageclass);
2782 DS.ClearStorageClassSpecs();
2783 }
2784
2785 // Issue diagnostic and remove function specifier if present.
2786 if (Specs & DeclSpec::PQ_FunctionSpecifier) {
2787 if (DS.isInlineSpecified())
2788 Diag(Loc: DS.getInlineSpecLoc(), DiagID: diag::err_typename_invalid_functionspec);
2789 if (DS.isVirtualSpecified())
2790 Diag(Loc: DS.getVirtualSpecLoc(), DiagID: diag::err_typename_invalid_functionspec);
2791 if (DS.hasExplicitSpecifier())
2792 Diag(Loc: DS.getExplicitSpecLoc(), DiagID: diag::err_typename_invalid_functionspec);
2793 if (DS.isNoreturnSpecified())
2794 Diag(Loc: DS.getNoreturnSpecLoc(), DiagID: diag::err_typename_invalid_functionspec);
2795 DS.ClearFunctionSpecs();
2796 }
2797
2798 // Issue diagnostic and remove constexpr specifier if present.
2799 if (DS.hasConstexprSpecifier() && DSC != DeclSpecContext::DSC_condition) {
2800 Diag(Loc: DS.getConstexprSpecLoc(), DiagID: diag::err_typename_invalid_constexpr)
2801 << static_cast<int>(DS.getConstexprSpecifier());
2802 DS.ClearConstexprSpec();
2803 }
2804}
2805
2806/// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the
2807/// specified token is valid after the identifier in a declarator which
2808/// immediately follows the declspec. For example, these things are valid:
2809///
2810/// int x [ 4]; // direct-declarator
2811/// int x ( int y); // direct-declarator
2812/// int(int x ) // direct-declarator
2813/// int x ; // simple-declaration
2814/// int x = 17; // init-declarator-list
2815/// int x , y; // init-declarator-list
2816/// int x __asm__ ("foo"); // init-declarator-list
2817/// int x : 4; // struct-declarator
2818/// int x { 5}; // C++'0x unified initializers
2819///
2820/// This is not, because 'x' does not immediately follow the declspec (though
2821/// ')' happens to be valid anyway).
2822/// int (x)
2823///
2824static bool isValidAfterIdentifierInDeclarator(const Token &T) {
2825 return T.isOneOf(Ks: tok::l_square, Ks: tok::l_paren, Ks: tok::r_paren, Ks: tok::semi,
2826 Ks: tok::comma, Ks: tok::equal, Ks: tok::kw_asm, Ks: tok::l_brace,
2827 Ks: tok::colon);
2828}
2829
2830bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
2831 ParsedTemplateInfo &TemplateInfo,
2832 AccessSpecifier AS, DeclSpecContext DSC,
2833 ParsedAttributes &Attrs) {
2834 assert(Tok.is(tok::identifier) && "should have identifier");
2835
2836 SourceLocation Loc = Tok.getLocation();
2837 // If we see an identifier that is not a type name, we normally would
2838 // parse it as the identifier being declared. However, when a typename
2839 // is typo'd or the definition is not included, this will incorrectly
2840 // parse the typename as the identifier name and fall over misparsing
2841 // later parts of the diagnostic.
2842 //
2843 // As such, we try to do some look-ahead in cases where this would
2844 // otherwise be an "implicit-int" case to see if this is invalid. For
2845 // example: "static foo_t x = 4;" In this case, if we parsed foo_t as
2846 // an identifier with implicit int, we'd get a parse error because the
2847 // next token is obviously invalid for a type. Parse these as a case
2848 // with an invalid type specifier.
2849 assert(!DS.hasTypeSpecifier() && "Type specifier checked above");
2850
2851 // Since we know that this either implicit int (which is rare) or an
2852 // error, do lookahead to try to do better recovery. This never applies
2853 // within a type specifier. Outside of C++, we allow this even if the
2854 // language doesn't "officially" support implicit int -- we support
2855 // implicit int as an extension in some language modes.
2856 if (!isTypeSpecifier(DSC) && getLangOpts().isImplicitIntAllowed() &&
2857 isValidAfterIdentifierInDeclarator(T: NextToken())) {
2858 // If this token is valid for implicit int, e.g. "static x = 4", then
2859 // we just avoid eating the identifier, so it will be parsed as the
2860 // identifier in the declarator.
2861 return false;
2862 }
2863
2864 // Early exit as Sema has a dedicated missing_actual_pipe_type diagnostic
2865 // for incomplete declarations such as `pipe p`.
2866 if (getLangOpts().OpenCLCPlusPlus && DS.isTypeSpecPipe())
2867 return false;
2868
2869 if (getLangOpts().CPlusPlus &&
2870 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
2871 // Don't require a type specifier if we have the 'auto' storage class
2872 // specifier in C++98 -- we'll promote it to a type specifier.
2873 if (SS)
2874 AnnotateScopeToken(SS&: *SS, /*IsNewAnnotation*/false);
2875 return false;
2876 }
2877
2878 if (getLangOpts().CPlusPlus && (!SS || SS->isEmpty()) &&
2879 getLangOpts().MSVCCompat) {
2880 // Lookup of an unqualified type name has failed in MSVC compatibility mode.
2881 // Give Sema a chance to recover if we are in a template with dependent base
2882 // classes.
2883 if (ParsedType T = Actions.ActOnMSVCUnknownTypeName(
2884 II: *Tok.getIdentifierInfo(), NameLoc: Tok.getLocation(),
2885 IsTemplateTypeArg: DSC == DeclSpecContext::DSC_template_type_arg)) {
2886 const char *PrevSpec;
2887 unsigned DiagID;
2888 DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec, DiagID, Rep: T,
2889 Policy: Actions.getASTContext().getPrintingPolicy());
2890 DS.SetRangeEnd(Tok.getLocation());
2891 ConsumeToken();
2892 return false;
2893 }
2894 }
2895
2896 // Otherwise, if we don't consume this token, we are going to emit an
2897 // error anyway. Try to recover from various common problems. Check
2898 // to see if this was a reference to a tag name without a tag specified.
2899 // This is a common problem in C (saying 'foo' instead of 'struct foo').
2900 //
2901 // C++ doesn't need this, and isTagName doesn't take SS.
2902 if (SS == nullptr) {
2903 const char *TagName = nullptr, *FixitTagName = nullptr;
2904 tok::TokenKind TagKind = tok::unknown;
2905
2906 switch (Actions.isTagName(II&: *Tok.getIdentifierInfo(), S: getCurScope())) {
2907 default: break;
2908 case DeclSpec::TST_enum:
2909 TagName="enum" ; FixitTagName = "enum " ; TagKind=tok::kw_enum ;break;
2910 case DeclSpec::TST_union:
2911 TagName="union" ; FixitTagName = "union " ;TagKind=tok::kw_union ;break;
2912 case DeclSpec::TST_struct:
2913 TagName="struct"; FixitTagName = "struct ";TagKind=tok::kw_struct;break;
2914 case DeclSpec::TST_interface:
2915 TagName="__interface"; FixitTagName = "__interface ";
2916 TagKind=tok::kw___interface;break;
2917 case DeclSpec::TST_class:
2918 TagName="class" ; FixitTagName = "class " ;TagKind=tok::kw_class ;break;
2919 }
2920
2921 if (TagName) {
2922 IdentifierInfo *TokenName = Tok.getIdentifierInfo();
2923 LookupResult R(Actions, TokenName, SourceLocation(),
2924 Sema::LookupOrdinaryName);
2925
2926 Diag(Loc, DiagID: diag::err_use_of_tag_name_without_tag)
2927 << TokenName << TagName << getLangOpts().CPlusPlus
2928 << FixItHint::CreateInsertion(InsertionLoc: Tok.getLocation(), Code: FixitTagName);
2929
2930 if (Actions.LookupName(R, S: getCurScope())) {
2931 for (LookupResult::iterator I = R.begin(), IEnd = R.end();
2932 I != IEnd; ++I)
2933 Diag(Loc: (*I)->getLocation(), DiagID: diag::note_decl_hiding_tag_type)
2934 << TokenName << TagName;
2935 }
2936
2937 // Parse this as a tag as if the missing tag were present.
2938 if (TagKind == tok::kw_enum)
2939 ParseEnumSpecifier(TagLoc: Loc, DS, TemplateInfo, AS,
2940 DSC: DeclSpecContext::DSC_normal);
2941 else
2942 ParseClassSpecifier(TagTokKind: TagKind, TagLoc: Loc, DS, TemplateInfo, AS,
2943 /*EnteringContext*/ false,
2944 DSC: DeclSpecContext::DSC_normal, Attributes&: Attrs);
2945 return true;
2946 }
2947 }
2948
2949 // Determine whether this identifier could plausibly be the name of something
2950 // being declared (with a missing type).
2951 if (!isTypeSpecifier(DSC) && (!SS || DSC == DeclSpecContext::DSC_top_level ||
2952 DSC == DeclSpecContext::DSC_class)) {
2953 // Look ahead to the next token to try to figure out what this declaration
2954 // was supposed to be.
2955 switch (NextToken().getKind()) {
2956 case tok::l_paren: {
2957 // static x(4); // 'x' is not a type
2958 // x(int n); // 'x' is not a type
2959 // x (*p)[]; // 'x' is a type
2960 //
2961 // Since we're in an error case, we can afford to perform a tentative
2962 // parse to determine which case we're in.
2963 TentativeParsingAction PA(*this);
2964 ConsumeToken();
2965 TPResult TPR = TryParseDeclarator(/*mayBeAbstract*/false);
2966 PA.Revert();
2967
2968 if (TPR != TPResult::False) {
2969 // The identifier is followed by a parenthesized declarator.
2970 // It's supposed to be a type.
2971 break;
2972 }
2973
2974 // If we're in a context where we could be declaring a constructor,
2975 // check whether this is a constructor declaration with a bogus name.
2976 if (DSC == DeclSpecContext::DSC_class ||
2977 (DSC == DeclSpecContext::DSC_top_level && SS)) {
2978 IdentifierInfo *II = Tok.getIdentifierInfo();
2979 if (Actions.isCurrentClassNameTypo(II, SS)) {
2980 Diag(Loc, DiagID: diag::err_constructor_bad_name)
2981 << Tok.getIdentifierInfo() << II
2982 << FixItHint::CreateReplacement(RemoveRange: Tok.getLocation(), Code: II->getName());
2983 Tok.setIdentifierInfo(II);
2984 }
2985 }
2986 // Fall through.
2987 [[fallthrough]];
2988 }
2989 case tok::comma:
2990 case tok::equal:
2991 case tok::kw_asm:
2992 case tok::l_brace:
2993 case tok::l_square:
2994 case tok::semi:
2995 // This looks like a variable or function declaration. The type is
2996 // probably missing. We're done parsing decl-specifiers.
2997 // But only if we are not in a function prototype scope.
2998 if (getCurScope()->isFunctionPrototypeScope())
2999 break;
3000 if (SS)
3001 AnnotateScopeToken(SS&: *SS, /*IsNewAnnotation*/false);
3002 return false;
3003
3004 default:
3005 // This is probably supposed to be a type. This includes cases like:
3006 // int f(itn);
3007 // struct S { unsigned : 4; };
3008 break;
3009 }
3010 }
3011
3012 // This is almost certainly an invalid type name. Let Sema emit a diagnostic
3013 // and attempt to recover.
3014 ParsedType T;
3015 IdentifierInfo *II = Tok.getIdentifierInfo();
3016 bool IsTemplateName = getLangOpts().CPlusPlus && NextToken().is(K: tok::less);
3017 Actions.DiagnoseUnknownTypeName(II, IILoc: Loc, S: getCurScope(), SS, SuggestedType&: T,
3018 IsTemplateName);
3019 if (T) {
3020 // The action has suggested that the type T could be used. Set that as
3021 // the type in the declaration specifiers, consume the would-be type
3022 // name token, and we're done.
3023 const char *PrevSpec;
3024 unsigned DiagID;
3025 DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec, DiagID, Rep: T,
3026 Policy: Actions.getASTContext().getPrintingPolicy());
3027 DS.SetRangeEnd(Tok.getLocation());
3028 ConsumeToken();
3029 // There may be other declaration specifiers after this.
3030 return true;
3031 } else if (II != Tok.getIdentifierInfo()) {
3032 // If no type was suggested, the correction is to a keyword
3033 Tok.setKind(II->getTokenID());
3034 // There may be other declaration specifiers after this.
3035 return true;
3036 }
3037
3038 // Otherwise, the action had no suggestion for us. Mark this as an error.
3039 DS.SetTypeSpecError();
3040 DS.SetRangeEnd(Tok.getLocation());
3041 ConsumeToken();
3042
3043 // Eat any following template arguments.
3044 if (IsTemplateName) {
3045 SourceLocation LAngle, RAngle;
3046 TemplateArgList Args;
3047 ParseTemplateIdAfterTemplateName(ConsumeLastToken: true, LAngleLoc&: LAngle, TemplateArgs&: Args, RAngleLoc&: RAngle);
3048 }
3049
3050 // TODO: Could inject an invalid typedef decl in an enclosing scope to
3051 // avoid rippling error messages on subsequent uses of the same type,
3052 // could be useful if #include was forgotten.
3053 return true;
3054}
3055
3056Parser::DeclSpecContext
3057Parser::getDeclSpecContextFromDeclaratorContext(DeclaratorContext Context) {
3058 switch (Context) {
3059 case DeclaratorContext::Member:
3060 return DeclSpecContext::DSC_class;
3061 case DeclaratorContext::File:
3062 return DeclSpecContext::DSC_top_level;
3063 case DeclaratorContext::TemplateParam:
3064 return DeclSpecContext::DSC_template_param;
3065 case DeclaratorContext::TemplateArg:
3066 return DeclSpecContext::DSC_template_arg;
3067 case DeclaratorContext::TemplateTypeArg:
3068 return DeclSpecContext::DSC_template_type_arg;
3069 case DeclaratorContext::TrailingReturn:
3070 case DeclaratorContext::TrailingReturnVar:
3071 return DeclSpecContext::DSC_trailing;
3072 case DeclaratorContext::AliasDecl:
3073 case DeclaratorContext::AliasTemplate:
3074 return DeclSpecContext::DSC_alias_declaration;
3075 case DeclaratorContext::Association:
3076 return DeclSpecContext::DSC_association;
3077 case DeclaratorContext::TypeName:
3078 return DeclSpecContext::DSC_type_specifier;
3079 case DeclaratorContext::Condition:
3080 return DeclSpecContext::DSC_condition;
3081 case DeclaratorContext::ConversionId:
3082 return DeclSpecContext::DSC_conv_operator;
3083 case DeclaratorContext::CXXNew:
3084 return DeclSpecContext::DSC_new;
3085 case DeclaratorContext::Prototype:
3086 case DeclaratorContext::ObjCResult:
3087 case DeclaratorContext::ObjCParameter:
3088 case DeclaratorContext::KNRTypeList:
3089 case DeclaratorContext::FunctionalCast:
3090 case DeclaratorContext::Block:
3091 case DeclaratorContext::ForInit:
3092 case DeclaratorContext::SelectionInit:
3093 case DeclaratorContext::CXXCatch:
3094 case DeclaratorContext::ObjCCatch:
3095 case DeclaratorContext::BlockLiteral:
3096 case DeclaratorContext::LambdaExpr:
3097 case DeclaratorContext::LambdaExprParameter:
3098 case DeclaratorContext::RequiresExpr:
3099 return DeclSpecContext::DSC_normal;
3100 }
3101
3102 llvm_unreachable("Missing DeclaratorContext case");
3103}
3104
3105ExprResult Parser::ParseAlignArgument(StringRef KWName, SourceLocation Start,
3106 SourceLocation &EllipsisLoc, bool &IsType,
3107 ParsedType &TypeResult) {
3108 ExprResult ER;
3109 if (isTypeIdInParens()) {
3110 SourceLocation TypeLoc = Tok.getLocation();
3111 ParsedType Ty = ParseTypeName().get();
3112 SourceRange TypeRange(Start, Tok.getLocation());
3113 if (Actions.ActOnAlignasTypeArgument(KWName, Ty, OpLoc: TypeLoc, R: TypeRange))
3114 return ExprError();
3115 TypeResult = Ty;
3116 IsType = true;
3117 } else {
3118 ER = ParseConstantExpression();
3119 IsType = false;
3120 }
3121
3122 if (getLangOpts().CPlusPlus11)
3123 TryConsumeToken(Expected: tok::ellipsis, Loc&: EllipsisLoc);
3124
3125 return ER;
3126}
3127
3128void Parser::ParseAlignmentSpecifier(ParsedAttributes &Attrs,
3129 SourceLocation *EndLoc) {
3130 assert(Tok.isOneOf(tok::kw_alignas, tok::kw__Alignas) &&
3131 "Not an alignment-specifier!");
3132 Token KWTok = Tok;
3133 IdentifierInfo *KWName = KWTok.getIdentifierInfo();
3134 auto Kind = KWTok.getKind();
3135 SourceLocation KWLoc = ConsumeToken();
3136
3137 BalancedDelimiterTracker T(*this, tok::l_paren);
3138 if (T.expectAndConsume())
3139 return;
3140
3141 bool IsType;
3142 ParsedType TypeResult;
3143 SourceLocation EllipsisLoc;
3144 ExprResult ArgExpr =
3145 ParseAlignArgument(KWName: PP.getSpelling(Tok: KWTok), Start: T.getOpenLocation(),
3146 EllipsisLoc, IsType, TypeResult);
3147 if (ArgExpr.isInvalid()) {
3148 T.skipToEnd();
3149 return;
3150 }
3151
3152 T.consumeClose();
3153 if (EndLoc)
3154 *EndLoc = T.getCloseLocation();
3155
3156 if (IsType) {
3157 Attrs.addNewTypeAttr(attrName: KWName, attrRange: KWLoc, scope: AttributeScopeInfo(), typeArg: TypeResult, formUsed: Kind,
3158 ellipsisLoc: EllipsisLoc);
3159 } else {
3160 ArgsVector ArgExprs;
3161 ArgExprs.push_back(Elt: ArgExpr.get());
3162 Attrs.addNew(attrName: KWName, attrRange: KWLoc, scope: AttributeScopeInfo(), args: ArgExprs.data(), numArgs: 1, form: Kind,
3163 ellipsisLoc: EllipsisLoc);
3164 }
3165}
3166
3167void Parser::DistributeCLateParsedAttrs(Decl *Dcl,
3168 LateParsedAttrList *LateAttrs) {
3169 if (!LateAttrs)
3170 return;
3171
3172 if (Dcl) {
3173 for (auto *LateAttr : *LateAttrs) {
3174 if (LateAttr->Decls.empty())
3175 LateAttr->addDecl(D: Dcl);
3176 }
3177 }
3178}
3179
3180void Parser::ParsePtrauthQualifier(ParsedAttributes &Attrs) {
3181 assert(Tok.is(tok::kw___ptrauth));
3182
3183 IdentifierInfo *KwName = Tok.getIdentifierInfo();
3184 SourceLocation KwLoc = ConsumeToken();
3185
3186 BalancedDelimiterTracker T(*this, tok::l_paren);
3187 if (T.expectAndConsume())
3188 return;
3189
3190 ArgsVector ArgExprs;
3191 do {
3192 ExprResult ER = ParseAssignmentExpression();
3193 if (ER.isInvalid()) {
3194 T.skipToEnd();
3195 return;
3196 }
3197 ArgExprs.push_back(Elt: ER.get());
3198 } while (TryConsumeToken(Expected: tok::comma));
3199
3200 T.consumeClose();
3201 SourceLocation EndLoc = T.getCloseLocation();
3202
3203 if (ArgExprs.empty() || ArgExprs.size() > 3) {
3204 Diag(Loc: KwLoc, DiagID: diag::err_ptrauth_qualifier_bad_arg_count);
3205 return;
3206 }
3207
3208 Attrs.addNew(attrName: KwName, attrRange: SourceRange(KwLoc, EndLoc), scope: AttributeScopeInfo(),
3209 args: ArgExprs.data(), numArgs: ArgExprs.size(),
3210 form: ParsedAttr::Form::Keyword(/*IsAlignAs=*/IsAlignas: false,
3211 /*IsRegularKeywordAttribute=*/false));
3212}
3213
3214void Parser::ParseBoundsAttribute(IdentifierInfo &AttrName,
3215 SourceLocation AttrNameLoc,
3216 ParsedAttributes &Attrs,
3217 IdentifierInfo *ScopeName,
3218 SourceLocation ScopeLoc,
3219 ParsedAttr::Form Form) {
3220 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
3221
3222 BalancedDelimiterTracker Parens(*this, tok::l_paren);
3223 Parens.consumeOpen();
3224
3225 if (Tok.is(K: tok::r_paren)) {
3226 Diag(Loc: Tok.getLocation(), DiagID: diag::err_argument_required_after_attribute);
3227 Parens.consumeClose();
3228 return;
3229 }
3230
3231 ArgsVector ArgExprs;
3232 // Don't evaluate argument when the attribute is ignored.
3233 using ExpressionKind =
3234 Sema::ExpressionEvaluationContextRecord::ExpressionKind;
3235 EnterExpressionEvaluationContext EC(
3236 Actions, Sema::ExpressionEvaluationContext::PotentiallyEvaluated, nullptr,
3237 ExpressionKind::EK_AttrArgument);
3238
3239 ExprResult ArgExpr = ParseAssignmentExpression();
3240 if (ArgExpr.isInvalid()) {
3241 Parens.skipToEnd();
3242 return;
3243 }
3244
3245 ArgExprs.push_back(Elt: ArgExpr.get());
3246 Parens.consumeClose();
3247
3248 ASTContext &Ctx = Actions.getASTContext();
3249
3250 ArgExprs.push_back(Elt: IntegerLiteral::Create(
3251 C: Ctx, V: llvm::APInt(Ctx.getTypeSize(T: Ctx.getSizeType()), 0),
3252 type: Ctx.getSizeType(), l: SourceLocation()));
3253
3254 Attrs.addNew(attrName: &AttrName, attrRange: SourceRange(AttrNameLoc, Parens.getCloseLocation()),
3255 scope: AttributeScopeInfo(), args: ArgExprs.data(), numArgs: ArgExprs.size(), form: Form);
3256}
3257
3258ExprResult Parser::ParseExtIntegerArgument() {
3259 assert(Tok.isOneOf(tok::kw__ExtInt, tok::kw__BitInt) &&
3260 "Not an extended int type");
3261 ConsumeToken();
3262
3263 BalancedDelimiterTracker T(*this, tok::l_paren);
3264 if (T.expectAndConsume())
3265 return ExprError();
3266
3267 ExprResult ER = ParseConstantExpression();
3268 if (ER.isInvalid()) {
3269 T.skipToEnd();
3270 return ExprError();
3271 }
3272
3273 if(T.consumeClose())
3274 return ExprError();
3275 return ER;
3276}
3277
3278bool
3279Parser::DiagnoseMissingSemiAfterTagDefinition(DeclSpec &DS, AccessSpecifier AS,
3280 DeclSpecContext DSContext,
3281 LateParsedAttrList *LateAttrs) {
3282 assert(DS.hasTagDefinition() && "shouldn't call this");
3283
3284 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
3285 DSContext == DeclSpecContext::DSC_top_level);
3286
3287 if (getLangOpts().CPlusPlus &&
3288 (Tok.isOneOf(Ks: tok::identifier, Ks: tok::coloncolon, Ks: tok::kw_decltype) ||
3289 (Tok.is(K: tok::annot_template_id) && NextToken().is(K: tok::coloncolon))) &&
3290 TryAnnotateCXXScopeToken(EnteringContext)) {
3291 SkipMalformedDecl();
3292 return true;
3293 }
3294
3295 bool HasScope = Tok.is(K: tok::annot_cxxscope);
3296 // Make a copy in case GetLookAheadToken invalidates the result of NextToken.
3297 Token AfterScope = HasScope ? NextToken() : Tok;
3298
3299 // Determine whether the following tokens could possibly be a
3300 // declarator.
3301 bool MightBeDeclarator = true;
3302 if (Tok.isOneOf(Ks: tok::kw_typename, Ks: tok::annot_typename)) {
3303 // A declarator-id can't start with 'typename'.
3304 MightBeDeclarator = false;
3305 } else if (AfterScope.is(K: tok::annot_template_id)) {
3306 // If we have a type expressed as a template-id, this cannot be a
3307 // declarator-id (such a type cannot be redeclared in a simple-declaration).
3308 TemplateIdAnnotation *Annot =
3309 static_cast<TemplateIdAnnotation *>(AfterScope.getAnnotationValue());
3310 if (Annot->Kind == TNK_Type_template)
3311 MightBeDeclarator = false;
3312 } else if (AfterScope.is(K: tok::identifier)) {
3313 const Token &Next = HasScope ? GetLookAheadToken(N: 2) : NextToken();
3314
3315 // These tokens cannot come after the declarator-id in a
3316 // simple-declaration, and are likely to come after a type-specifier.
3317 if (Next.isOneOf(Ks: tok::star, Ks: tok::amp, Ks: tok::ampamp, Ks: tok::identifier,
3318 Ks: tok::annot_cxxscope, Ks: tok::coloncolon)) {
3319 // Missing a semicolon.
3320 MightBeDeclarator = false;
3321 } else if (HasScope) {
3322 // If the declarator-id has a scope specifier, it must redeclare a
3323 // previously-declared entity. If that's a type (and this is not a
3324 // typedef), that's an error.
3325 CXXScopeSpec SS;
3326 Actions.RestoreNestedNameSpecifierAnnotation(
3327 Annotation: Tok.getAnnotationValue(), AnnotationRange: Tok.getAnnotationRange(), SS);
3328 IdentifierInfo *Name = AfterScope.getIdentifierInfo();
3329 Sema::NameClassification Classification = Actions.ClassifyName(
3330 S: getCurScope(), SS, Name, NameLoc: AfterScope.getLocation(), NextToken: Next,
3331 /*CCC=*/nullptr);
3332 switch (Classification.getKind()) {
3333 case NameClassificationKind::Error:
3334 SkipMalformedDecl();
3335 return true;
3336
3337 case NameClassificationKind::Keyword:
3338 llvm_unreachable("typo correction is not possible here");
3339
3340 case NameClassificationKind::Type:
3341 case NameClassificationKind::TypeTemplate:
3342 case NameClassificationKind::UndeclaredNonType:
3343 case NameClassificationKind::UndeclaredTemplate:
3344 case NameClassificationKind::Concept:
3345 // Not a previously-declared non-type entity.
3346 MightBeDeclarator = false;
3347 break;
3348
3349 case NameClassificationKind::Unknown:
3350 case NameClassificationKind::NonType:
3351 case NameClassificationKind::DependentNonType:
3352 case NameClassificationKind::OverloadSet:
3353 case NameClassificationKind::VarTemplate:
3354 case NameClassificationKind::FunctionTemplate:
3355 // Might be a redeclaration of a prior entity.
3356 break;
3357 }
3358 }
3359 }
3360
3361 if (MightBeDeclarator)
3362 return false;
3363
3364 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
3365 Diag(Loc: PP.getLocForEndOfToken(Loc: DS.getRepAsDecl()->getEndLoc()),
3366 DiagID: diag::err_expected_after)
3367 << DeclSpec::getSpecifierName(T: DS.getTypeSpecType(), Policy: PPol) << tok::semi;
3368
3369 // Try to recover from the typo, by dropping the tag definition and parsing
3370 // the problematic tokens as a type.
3371 //
3372 // FIXME: Split the DeclSpec into pieces for the standalone
3373 // declaration and pieces for the following declaration, instead
3374 // of assuming that all the other pieces attach to new declaration,
3375 // and call ParsedFreeStandingDeclSpec as appropriate.
3376 DS.ClearTypeSpecType();
3377 ParsedTemplateInfo NotATemplate;
3378 ParseDeclarationSpecifiers(DS, TemplateInfo&: NotATemplate, AS, DSC: DSContext, LateAttrs);
3379 return false;
3380}
3381
3382void Parser::ParseDeclarationSpecifiers(
3383 DeclSpec &DS, ParsedTemplateInfo &TemplateInfo, AccessSpecifier AS,
3384 DeclSpecContext DSContext, LateParsedAttrList *LateAttrs,
3385 ImplicitTypenameContext AllowImplicitTypename) {
3386 if (DS.getSourceRange().isInvalid()) {
3387 // Start the range at the current token but make the end of the range
3388 // invalid. This will make the entire range invalid unless we successfully
3389 // consume a token.
3390 DS.SetRangeStart(Tok.getLocation());
3391 DS.SetRangeEnd(SourceLocation());
3392 }
3393
3394 // If we are in a operator context, convert it back into a type specifier
3395 // context for better error handling later on.
3396 if (DSContext == DeclSpecContext::DSC_conv_operator)
3397 DSContext = DeclSpecContext::DSC_type_specifier;
3398
3399 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
3400 DSContext == DeclSpecContext::DSC_top_level);
3401 bool AttrsLastTime = false;
3402 ParsedAttributes attrs(AttrFactory);
3403 // We use Sema's policy to get bool macros right.
3404 PrintingPolicy Policy = Actions.getPrintingPolicy();
3405 while (true) {
3406 bool isInvalid = false;
3407 bool isStorageClass = false;
3408 const char *PrevSpec = nullptr;
3409 unsigned DiagID = 0;
3410
3411 // This value needs to be set to the location of the last token if the last
3412 // token of the specifier is already consumed.
3413 SourceLocation ConsumedEnd;
3414
3415 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
3416 // implementation for VS2013 uses _Atomic as an identifier for one of the
3417 // classes in <atomic>.
3418 //
3419 // A typedef declaration containing _Atomic<...> is among the places where
3420 // the class is used. If we are currently parsing such a declaration, treat
3421 // the token as an identifier.
3422 if (getLangOpts().MSVCCompat && Tok.is(K: tok::kw__Atomic) &&
3423 DS.getStorageClassSpec() == clang::DeclSpec::SCS_typedef &&
3424 !DS.hasTypeSpecifier() && GetLookAheadToken(N: 1).is(K: tok::less))
3425 Tok.setKind(tok::identifier);
3426
3427 SourceLocation Loc = Tok.getLocation();
3428
3429 // Helper for image types in OpenCL.
3430 auto handleOpenCLImageKW = [&] (StringRef Ext, TypeSpecifierType ImageTypeSpec) {
3431 // Check if the image type is supported and otherwise turn the keyword into an identifier
3432 // because image types from extensions are not reserved identifiers.
3433 if (!StringRef(Ext).empty() && !getActions().getOpenCLOptions().isSupported(Ext, LO: getLangOpts())) {
3434 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
3435 Tok.setKind(tok::identifier);
3436 return false;
3437 }
3438 isInvalid = DS.SetTypeSpecType(T: ImageTypeSpec, Loc, PrevSpec, DiagID, Policy);
3439 return true;
3440 };
3441
3442 // Turn off usual access checking for template specializations and
3443 // instantiations.
3444 bool IsTemplateSpecOrInst =
3445 (TemplateInfo.Kind == ParsedTemplateKind::ExplicitInstantiation ||
3446 TemplateInfo.Kind == ParsedTemplateKind::ExplicitSpecialization);
3447
3448 switch (Tok.getKind()) {
3449 default:
3450 if (Tok.isRegularKeywordAttribute())
3451 goto Attribute;
3452
3453 DoneWithDeclSpec:
3454 if (!AttrsLastTime)
3455 ProhibitAttributes(Attrs&: attrs);
3456 else {
3457 // Reject C++11 / C23 attributes that aren't type attributes.
3458 for (const ParsedAttr &PA : attrs) {
3459 if (!PA.isCXX11Attribute() && !PA.isC23Attribute() &&
3460 !PA.isRegularKeywordAttribute())
3461 continue;
3462 if (PA.getKind() == ParsedAttr::UnknownAttribute)
3463 // We will warn about the unknown attribute elsewhere (in
3464 // SemaDeclAttr.cpp)
3465 continue;
3466 // GCC ignores this attribute when placed on the DeclSpec in [[]]
3467 // syntax, so we do the same.
3468 if (PA.getKind() == ParsedAttr::AT_VectorSize) {
3469 Diag(Loc: PA.getLoc(), DiagID: diag::warn_attribute_ignored) << PA;
3470 PA.setInvalid();
3471 continue;
3472 }
3473 // We reject AT_LifetimeBound and AT_AnyX86NoCfCheck, even though they
3474 // are type attributes, because we historically haven't allowed these
3475 // to be used as type attributes in C++11 / C23 syntax.
3476 if (PA.isTypeAttr() && PA.getKind() != ParsedAttr::AT_LifetimeBound &&
3477 PA.getKind() != ParsedAttr::AT_AnyX86NoCfCheck)
3478 continue;
3479
3480 if (PA.getKind() == ParsedAttr::AT_LifetimeBound)
3481 Diag(Loc: PA.getLoc(), DiagID: diag::err_attribute_wrong_decl_type)
3482 << PA << PA.isRegularKeywordAttribute()
3483 << ExpectedParameterOrImplicitObjectParameter;
3484 else
3485 Diag(Loc: PA.getLoc(), DiagID: diag::err_attribute_not_type_attr)
3486 << PA << PA.isRegularKeywordAttribute();
3487 PA.setInvalid();
3488 }
3489
3490 DS.takeAttributesAppendingingFrom(attrs);
3491 }
3492
3493 // If this is not a declaration specifier token, we're done reading decl
3494 // specifiers. First verify that DeclSpec's are consistent.
3495 DS.Finish(S&: Actions, Policy);
3496 return;
3497
3498 // alignment-specifier
3499 case tok::kw__Alignas:
3500 diagnoseUseOfC11Keyword(Tok);
3501 [[fallthrough]];
3502 case tok::kw_alignas:
3503 // _Alignas and alignas (C23, not C++) should parse the same way. The C++
3504 // parsing for alignas happens through the usual attribute parsing. This
3505 // ensures that an alignas specifier can appear in a type position in C
3506 // despite that not being valid in C++.
3507 if (getLangOpts().C23 || Tok.getKind() == tok::kw__Alignas) {
3508 if (Tok.getKind() == tok::kw_alignas)
3509 Diag(Tok, DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
3510 ParseAlignmentSpecifier(Attrs&: DS.getAttributes());
3511 continue;
3512 }
3513 [[fallthrough]];
3514 case tok::l_square:
3515 if (!isAllowedCXX11AttributeSpecifier())
3516 goto DoneWithDeclSpec;
3517
3518 Attribute:
3519 ProhibitAttributes(Attrs&: attrs);
3520 // FIXME: It would be good to recover by accepting the attributes,
3521 // but attempting to do that now would cause serious
3522 // madness in terms of diagnostics.
3523 attrs.clear();
3524 attrs.Range = SourceRange();
3525
3526 ParseCXX11Attributes(attrs);
3527 AttrsLastTime = true;
3528 continue;
3529
3530 case tok::code_completion: {
3531 SemaCodeCompletion::ParserCompletionContext CCC =
3532 SemaCodeCompletion::PCC_Namespace;
3533 if (DS.hasTypeSpecifier()) {
3534 bool AllowNonIdentifiers
3535 = (getCurScope()->getFlags() & (Scope::ControlScope |
3536 Scope::BlockScope |
3537 Scope::TemplateParamScope |
3538 Scope::FunctionPrototypeScope |
3539 Scope::AtCatchScope)) == 0;
3540 bool AllowNestedNameSpecifiers
3541 = DSContext == DeclSpecContext::DSC_top_level ||
3542 (DSContext == DeclSpecContext::DSC_class && DS.isFriendSpecified());
3543
3544 cutOffParsing();
3545 Actions.CodeCompletion().CodeCompleteDeclSpec(
3546 S: getCurScope(), DS, AllowNonIdentifiers, AllowNestedNameSpecifiers);
3547 return;
3548 }
3549
3550 // Class context can appear inside a function/block, so prioritise that.
3551 if (TemplateInfo.Kind != ParsedTemplateKind::NonTemplate)
3552 CCC = DSContext == DeclSpecContext::DSC_class
3553 ? SemaCodeCompletion::PCC_MemberTemplate
3554 : SemaCodeCompletion::PCC_Template;
3555 else if (DSContext == DeclSpecContext::DSC_class)
3556 CCC = SemaCodeCompletion::PCC_Class;
3557 else if (getCurScope()->getFnParent() || getCurScope()->getBlockParent())
3558 CCC = SemaCodeCompletion::PCC_LocalDeclarationSpecifiers;
3559 else if (CurParsedObjCImpl)
3560 CCC = SemaCodeCompletion::PCC_ObjCImplementation;
3561
3562 cutOffParsing();
3563 Actions.CodeCompletion().CodeCompleteOrdinaryName(S: getCurScope(), CompletionContext: CCC);
3564 return;
3565 }
3566
3567 case tok::coloncolon: // ::foo::bar
3568 // C++ scope specifier. Annotate and loop, or bail out on error.
3569 if (getLangOpts().CPlusPlus &&
3570 TryAnnotateCXXScopeToken(EnteringContext)) {
3571 if (!DS.hasTypeSpecifier())
3572 DS.SetTypeSpecError();
3573 goto DoneWithDeclSpec;
3574 }
3575 if (Tok.is(K: tok::coloncolon)) // ::new or ::delete
3576 goto DoneWithDeclSpec;
3577 continue;
3578
3579 case tok::annot_cxxscope: {
3580 if (DS.hasTypeSpecifier() || DS.isTypeAltiVecVector())
3581 goto DoneWithDeclSpec;
3582
3583 CXXScopeSpec SS;
3584 if (TemplateInfo.TemplateParams)
3585 SS.setTemplateParamLists(*TemplateInfo.TemplateParams);
3586 Actions.RestoreNestedNameSpecifierAnnotation(Annotation: Tok.getAnnotationValue(),
3587 AnnotationRange: Tok.getAnnotationRange(),
3588 SS);
3589
3590 // We are looking for a qualified typename.
3591 Token Next = NextToken();
3592
3593 TemplateIdAnnotation *TemplateId = Next.is(K: tok::annot_template_id)
3594 ? takeTemplateIdAnnotation(tok: Next)
3595 : nullptr;
3596 if (TemplateId && TemplateId->hasInvalidName()) {
3597 // We found something like 'T::U<Args> x', but U is not a template.
3598 // Assume it was supposed to be a type.
3599 DS.SetTypeSpecError();
3600 ConsumeAnnotationToken();
3601 break;
3602 }
3603
3604 if (TemplateId && TemplateId->Kind == TNK_Type_template) {
3605 // We have a qualified template-id, e.g., N::A<int>
3606
3607 // If this would be a valid constructor declaration with template
3608 // arguments, we will reject the attempt to form an invalid type-id
3609 // referring to the injected-class-name when we annotate the token,
3610 // per C++ [class.qual]p2.
3611 //
3612 // To improve diagnostics for this case, parse the declaration as a
3613 // constructor (and reject the extra template arguments later).
3614 if ((DSContext == DeclSpecContext::DSC_top_level ||
3615 DSContext == DeclSpecContext::DSC_class) &&
3616 TemplateId->Name &&
3617 Actions.isCurrentClassName(II: *TemplateId->Name, S: getCurScope(), SS: &SS) &&
3618 isConstructorDeclarator(/*Unqualified=*/false,
3619 /*DeductionGuide=*/false,
3620 IsFriend: DS.isFriendSpecified())) {
3621 // The user meant this to be an out-of-line constructor
3622 // definition, but template arguments are not allowed
3623 // there. Just allow this as a constructor; we'll
3624 // complain about it later.
3625 goto DoneWithDeclSpec;
3626 }
3627
3628 DS.getTypeSpecScope() = SS;
3629 ConsumeAnnotationToken(); // The C++ scope.
3630 assert(Tok.is(tok::annot_template_id) &&
3631 "ParseOptionalCXXScopeSpecifier not working");
3632 AnnotateTemplateIdTokenAsType(SS, AllowImplicitTypename);
3633 continue;
3634 }
3635
3636 if (TemplateId && TemplateId->Kind == TNK_Concept_template) {
3637 DS.getTypeSpecScope() = SS;
3638 // This is probably a qualified placeholder-specifier, e.g., ::C<int>
3639 // auto ... Consume the scope annotation and continue to consume the
3640 // template-id as a placeholder-specifier. Let the next iteration
3641 // diagnose a missing auto.
3642 ConsumeAnnotationToken();
3643 continue;
3644 }
3645
3646 if (Next.is(K: tok::annot_typename)) {
3647 DS.getTypeSpecScope() = SS;
3648 ConsumeAnnotationToken(); // The C++ scope.
3649 TypeResult T = getTypeAnnotation(Tok);
3650 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_typename,
3651 Loc: Tok.getAnnotationEndLoc(),
3652 PrevSpec, DiagID, Rep: T, Policy);
3653 if (isInvalid)
3654 break;
3655 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3656 ConsumeAnnotationToken(); // The typename
3657 }
3658
3659 if (AllowImplicitTypename == ImplicitTypenameContext::Yes &&
3660 Next.is(K: tok::annot_template_id) &&
3661 static_cast<TemplateIdAnnotation *>(Next.getAnnotationValue())
3662 ->Kind == TNK_Dependent_template_name) {
3663 DS.getTypeSpecScope() = SS;
3664 ConsumeAnnotationToken(); // The C++ scope.
3665 AnnotateTemplateIdTokenAsType(SS, AllowImplicitTypename);
3666 continue;
3667 }
3668
3669 if (Next.isNot(K: tok::identifier))
3670 goto DoneWithDeclSpec;
3671
3672 // Check whether this is a constructor declaration. If we're in a
3673 // context where the identifier could be a class name, and it has the
3674 // shape of a constructor declaration, process it as one.
3675 if ((DSContext == DeclSpecContext::DSC_top_level ||
3676 DSContext == DeclSpecContext::DSC_class) &&
3677 Actions.isCurrentClassName(II: *Next.getIdentifierInfo(), S: getCurScope(),
3678 SS: &SS) &&
3679 isConstructorDeclarator(/*Unqualified=*/false,
3680 /*DeductionGuide=*/false,
3681 IsFriend: DS.isFriendSpecified(),
3682 TemplateInfo: &TemplateInfo))
3683 goto DoneWithDeclSpec;
3684
3685 // C++20 [temp.spec] 13.9/6.
3686 // This disables the access checking rules for function template explicit
3687 // instantiation and explicit specialization:
3688 // - `return type`.
3689 SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);
3690
3691 ParsedType TypeRep = Actions.getTypeName(
3692 II: *Next.getIdentifierInfo(), NameLoc: Next.getLocation(), S: getCurScope(), SS: &SS,
3693 isClassName: false, HasTrailingDot: false, ObjectType: nullptr,
3694 /*IsCtorOrDtorName=*/false,
3695 /*WantNontrivialTypeSourceInfo=*/true,
3696 IsClassTemplateDeductionContext: isClassTemplateDeductionContext(DSC: DSContext), AllowImplicitTypename);
3697
3698 if (IsTemplateSpecOrInst)
3699 SAC.done();
3700
3701 // If the referenced identifier is not a type, then this declspec is
3702 // erroneous: We already checked about that it has no type specifier, and
3703 // C++ doesn't have implicit int. Diagnose it as a typo w.r.t. to the
3704 // typename.
3705 if (!TypeRep) {
3706 if (TryAnnotateTypeConstraint())
3707 goto DoneWithDeclSpec;
3708 if (Tok.isNot(K: tok::annot_cxxscope) ||
3709 NextToken().isNot(K: tok::identifier))
3710 continue;
3711 // Eat the scope spec so the identifier is current.
3712 ConsumeAnnotationToken();
3713 ParsedAttributes Attrs(AttrFactory);
3714 if (ParseImplicitInt(DS, SS: &SS, TemplateInfo, AS, DSC: DSContext, Attrs)) {
3715 if (!Attrs.empty()) {
3716 AttrsLastTime = true;
3717 attrs.takeAllAppendingFrom(Other&: Attrs);
3718 }
3719 continue;
3720 }
3721 goto DoneWithDeclSpec;
3722 }
3723
3724 DS.getTypeSpecScope() = SS;
3725 ConsumeAnnotationToken(); // The C++ scope.
3726
3727 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec,
3728 DiagID, Rep: TypeRep, Policy);
3729 if (isInvalid)
3730 break;
3731
3732 DS.SetRangeEnd(Tok.getLocation());
3733 ConsumeToken(); // The typename.
3734
3735 continue;
3736 }
3737
3738 case tok::annot_typename: {
3739 // If we've previously seen a tag definition, we were almost surely
3740 // missing a semicolon after it.
3741 if (DS.hasTypeSpecifier() && DS.hasTagDefinition())
3742 goto DoneWithDeclSpec;
3743
3744 TypeResult T = getTypeAnnotation(Tok);
3745 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec,
3746 DiagID, Rep: T, Policy);
3747 if (isInvalid)
3748 break;
3749
3750 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3751 ConsumeAnnotationToken(); // The typename
3752
3753 continue;
3754 }
3755
3756 case tok::kw___is_signed:
3757 // HACK: before 2022-12, libstdc++ uses __is_signed as an identifier,
3758 // but Clang typically treats it as a trait.
3759 // If we see __is_signed as it appears in libstdc++, e.g.,
3760 //
3761 // static const bool __is_signed;
3762 //
3763 // then treat __is_signed as an identifier rather than as a keyword.
3764 // This was fixed by libstdc++ in December 2022.
3765 if (DS.getTypeSpecType() == TST_bool &&
3766 DS.getTypeQualifiers() == DeclSpec::TQ_const &&
3767 DS.getStorageClassSpec() == DeclSpec::SCS_static)
3768 TryKeywordIdentFallback(DisableKeyword: true);
3769
3770 // We're done with the declaration-specifiers.
3771 goto DoneWithDeclSpec;
3772
3773 // typedef-name
3774 case tok::kw___super:
3775 case tok::kw_decltype:
3776 case tok::identifier:
3777 ParseIdentifier: {
3778 // This identifier can only be a typedef name if we haven't already seen
3779 // a type-specifier. Without this check we misparse:
3780 // typedef int X; struct Y { short X; }; as 'short int'.
3781 if (DS.hasTypeSpecifier())
3782 goto DoneWithDeclSpec;
3783
3784 // If the token is an identifier named "__declspec" and Microsoft
3785 // extensions are not enabled, it is likely that there will be cascading
3786 // parse errors if this really is a __declspec attribute. Attempt to
3787 // recognize that scenario and recover gracefully.
3788 if (!getLangOpts().DeclSpecKeyword && Tok.is(K: tok::identifier) &&
3789 Tok.getIdentifierInfo()->getName() == "__declspec") {
3790 Diag(Loc, DiagID: diag::err_ms_attributes_not_enabled);
3791
3792 // The next token should be an open paren. If it is, eat the entire
3793 // attribute declaration and continue.
3794 if (NextToken().is(K: tok::l_paren)) {
3795 // Consume the __declspec identifier.
3796 ConsumeToken();
3797
3798 // Eat the parens and everything between them.
3799 BalancedDelimiterTracker T(*this, tok::l_paren);
3800 if (T.consumeOpen()) {
3801 assert(false && "Not a left paren?");
3802 return;
3803 }
3804 T.skipToEnd();
3805 continue;
3806 }
3807 }
3808
3809 // In C++, check to see if this is a scope specifier like foo::bar::, if
3810 // so handle it as such. This is important for ctor parsing.
3811 if (getLangOpts().CPlusPlus) {
3812 // C++20 [temp.spec] 13.9/6.
3813 // This disables the access checking rules for function template
3814 // explicit instantiation and explicit specialization:
3815 // - `return type`.
3816 SuppressAccessChecks SAC(*this, IsTemplateSpecOrInst);
3817
3818 const bool Success = TryAnnotateCXXScopeToken(EnteringContext);
3819
3820 if (IsTemplateSpecOrInst)
3821 SAC.done();
3822
3823 if (Success) {
3824 if (IsTemplateSpecOrInst)
3825 SAC.redelay();
3826 DS.SetTypeSpecError();
3827 goto DoneWithDeclSpec;
3828 }
3829
3830 if (!Tok.is(K: tok::identifier))
3831 continue;
3832 }
3833
3834 // Check for need to substitute AltiVec keyword tokens.
3835 if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid))
3836 break;
3837
3838 // [AltiVec] 2.2: [If the 'vector' specifier is used] The syntax does not
3839 // allow the use of a typedef name as a type specifier.
3840 if (DS.isTypeAltiVecVector())
3841 goto DoneWithDeclSpec;
3842
3843 if (DSContext == DeclSpecContext::DSC_objc_method_result &&
3844 isObjCInstancetype()) {
3845 ParsedType TypeRep = Actions.ObjC().ActOnObjCInstanceType(Loc);
3846 assert(TypeRep);
3847 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec,
3848 DiagID, Rep: TypeRep, Policy);
3849 if (isInvalid)
3850 break;
3851
3852 DS.SetRangeEnd(Loc);
3853 ConsumeToken();
3854 continue;
3855 }
3856
3857 // If we're in a context where the identifier could be a class name,
3858 // check whether this is a constructor declaration.
3859 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
3860 Actions.isCurrentClassName(II: *Tok.getIdentifierInfo(), S: getCurScope()) &&
3861 isConstructorDeclarator(/*Unqualified=*/true,
3862 /*DeductionGuide=*/false,
3863 IsFriend: DS.isFriendSpecified()))
3864 goto DoneWithDeclSpec;
3865
3866 ParsedType TypeRep = Actions.getTypeName(
3867 II: *Tok.getIdentifierInfo(), NameLoc: Tok.getLocation(), S: getCurScope(), SS: nullptr,
3868 isClassName: false, HasTrailingDot: false, ObjectType: nullptr, IsCtorOrDtorName: false, WantNontrivialTypeSourceInfo: false,
3869 IsClassTemplateDeductionContext: isClassTemplateDeductionContext(DSC: DSContext));
3870
3871 // If this is not a typedef name, don't parse it as part of the declspec,
3872 // it must be an implicit int or an error.
3873 if (!TypeRep) {
3874 if (TryAnnotateTypeConstraint())
3875 goto DoneWithDeclSpec;
3876 if (Tok.isNot(K: tok::identifier))
3877 continue;
3878 ParsedAttributes Attrs(AttrFactory);
3879 if (ParseImplicitInt(DS, SS: nullptr, TemplateInfo, AS, DSC: DSContext, Attrs)) {
3880 if (!Attrs.empty()) {
3881 AttrsLastTime = true;
3882 attrs.takeAllAppendingFrom(Other&: Attrs);
3883 }
3884 continue;
3885 }
3886 goto DoneWithDeclSpec;
3887 }
3888
3889 // Likewise, if this is a context where the identifier could be a template
3890 // name, check whether this is a deduction guide declaration.
3891 CXXScopeSpec SS;
3892 if (getLangOpts().CPlusPlus17 &&
3893 (DSContext == DeclSpecContext::DSC_class ||
3894 DSContext == DeclSpecContext::DSC_top_level) &&
3895 Actions.isDeductionGuideName(S: getCurScope(), Name: *Tok.getIdentifierInfo(),
3896 NameLoc: Tok.getLocation(), SS) &&
3897 isConstructorDeclarator(/*Unqualified*/ true,
3898 /*DeductionGuide*/ true))
3899 goto DoneWithDeclSpec;
3900
3901 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_typename, Loc, PrevSpec,
3902 DiagID, Rep: TypeRep, Policy);
3903 if (isInvalid)
3904 break;
3905
3906 DS.SetRangeEnd(Tok.getLocation());
3907 ConsumeToken(); // The identifier
3908
3909 // Objective-C supports type arguments and protocol references
3910 // following an Objective-C object or object pointer
3911 // type. Handle either one of them.
3912 if (Tok.is(K: tok::less) && getLangOpts().ObjC) {
3913 SourceLocation NewEndLoc;
3914 TypeResult NewTypeRep = parseObjCTypeArgsAndProtocolQualifiers(
3915 loc: Loc, type: TypeRep, /*consumeLastToken=*/true,
3916 endLoc&: NewEndLoc);
3917 if (NewTypeRep.isUsable()) {
3918 DS.UpdateTypeRep(Rep: NewTypeRep.get());
3919 DS.SetRangeEnd(NewEndLoc);
3920 }
3921 }
3922
3923 // Need to support trailing type qualifiers (e.g. "id<p> const").
3924 // If a type specifier follows, it will be diagnosed elsewhere.
3925 continue;
3926 }
3927
3928 // type-name or placeholder-specifier
3929 case tok::annot_template_id: {
3930 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
3931
3932 if (TemplateId->hasInvalidName()) {
3933 DS.SetTypeSpecError();
3934 break;
3935 }
3936
3937 if (TemplateId->Kind == TNK_Concept_template) {
3938 // If we've already diagnosed that this type-constraint has invalid
3939 // arguments, drop it and just form 'auto' or 'decltype(auto)'.
3940 if (TemplateId->hasInvalidArgs())
3941 TemplateId = nullptr;
3942
3943 // Any of the following tokens are likely the start of the user
3944 // forgetting 'auto' or 'decltype(auto)', so diagnose.
3945 // Note: if updating this list, please make sure we update
3946 // isCXXDeclarationSpecifier's check for IsPlaceholderSpecifier to have
3947 // a matching list.
3948 if (NextToken().isOneOf(Ks: tok::identifier, Ks: tok::kw_const,
3949 Ks: tok::kw_volatile, Ks: tok::kw_restrict, Ks: tok::amp,
3950 Ks: tok::ampamp)) {
3951 Diag(Loc, DiagID: diag::err_placeholder_expected_auto_or_decltype_auto)
3952 << FixItHint::CreateInsertion(InsertionLoc: NextToken().getLocation(), Code: "auto");
3953 // Attempt to continue as if 'auto' was placed here.
3954 isInvalid = DS.SetTypeSpecType(T: TST_auto, Loc, PrevSpec, DiagID,
3955 Rep: TemplateId, Policy);
3956 break;
3957 }
3958 if (!NextToken().isOneOf(Ks: tok::kw_auto, Ks: tok::kw_decltype))
3959 goto DoneWithDeclSpec;
3960
3961 if (TemplateId && !isInvalid && Actions.CheckTypeConstraint(TypeConstraint: TemplateId))
3962 TemplateId = nullptr;
3963
3964 ConsumeAnnotationToken();
3965 SourceLocation AutoLoc = Tok.getLocation();
3966 if (TryConsumeToken(Expected: tok::kw_decltype)) {
3967 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
3968 if (Tracker.consumeOpen()) {
3969 // Something like `void foo(Iterator decltype i)`
3970 Diag(Tok, DiagID: diag::err_expected) << tok::l_paren;
3971 } else {
3972 if (!TryConsumeToken(Expected: tok::kw_auto)) {
3973 // Something like `void foo(Iterator decltype(int) i)`
3974 Tracker.skipToEnd();
3975 Diag(Tok, DiagID: diag::err_placeholder_expected_auto_or_decltype_auto)
3976 << FixItHint::CreateReplacement(RemoveRange: SourceRange(AutoLoc,
3977 Tok.getLocation()),
3978 Code: "auto");
3979 } else {
3980 Tracker.consumeClose();
3981 }
3982 }
3983 ConsumedEnd = Tok.getLocation();
3984 DS.setTypeArgumentRange(Tracker.getRange());
3985 // Even if something went wrong above, continue as if we've seen
3986 // `decltype(auto)`.
3987 isInvalid = DS.SetTypeSpecType(T: TST_decltype_auto, Loc, PrevSpec,
3988 DiagID, Rep: TemplateId, Policy);
3989 } else {
3990 isInvalid = DS.SetTypeSpecType(T: TST_auto, Loc: AutoLoc, PrevSpec, DiagID,
3991 Rep: TemplateId, Policy);
3992 }
3993 break;
3994 }
3995
3996 if (TemplateId->Kind != TNK_Type_template &&
3997 TemplateId->Kind != TNK_Undeclared_template) {
3998 // This template-id does not refer to a type name, so we're
3999 // done with the type-specifiers.
4000 goto DoneWithDeclSpec;
4001 }
4002
4003 // If we're in a context where the template-id could be a
4004 // constructor name or specialization, check whether this is a
4005 // constructor declaration.
4006 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
4007 Actions.isCurrentClassName(II: *TemplateId->Name, S: getCurScope()) &&
4008 isConstructorDeclarator(/*Unqualified=*/true,
4009 /*DeductionGuide=*/false,
4010 IsFriend: DS.isFriendSpecified()))
4011 goto DoneWithDeclSpec;
4012
4013 // Turn the template-id annotation token into a type annotation
4014 // token, then try again to parse it as a type-specifier.
4015 CXXScopeSpec SS;
4016 AnnotateTemplateIdTokenAsType(SS, AllowImplicitTypename);
4017 continue;
4018 }
4019
4020 // Attributes support.
4021 case tok::kw___attribute:
4022 case tok::kw___declspec:
4023 ParseAttributes(WhichAttrKinds: PAKM_GNU | PAKM_Declspec, Attrs&: DS.getAttributes(), LateAttrs);
4024 continue;
4025
4026 // Microsoft single token adornments.
4027 case tok::kw___forceinline: {
4028 isInvalid = DS.setFunctionSpecForceInline(Loc, PrevSpec, DiagID);
4029 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
4030 SourceLocation AttrNameLoc = Tok.getLocation();
4031 DS.getAttributes().addNew(attrName: AttrName, attrRange: AttrNameLoc, scope: AttributeScopeInfo(),
4032 args: nullptr, numArgs: 0, form: tok::kw___forceinline);
4033 break;
4034 }
4035
4036 case tok::kw___unaligned:
4037 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
4038 Lang: getLangOpts());
4039 break;
4040
4041 // __ptrauth qualifier.
4042 case tok::kw___ptrauth:
4043 ParsePtrauthQualifier(Attrs&: DS.getAttributes());
4044 continue;
4045
4046 case tok::kw___sptr:
4047 case tok::kw___uptr:
4048 case tok::kw___ptr64:
4049 case tok::kw___ptr32:
4050 case tok::kw___w64:
4051 case tok::kw___cdecl:
4052 case tok::kw___stdcall:
4053 case tok::kw___fastcall:
4054 case tok::kw___thiscall:
4055 case tok::kw___regcall:
4056 case tok::kw___vectorcall:
4057 ParseMicrosoftTypeAttributes(attrs&: DS.getAttributes());
4058 continue;
4059
4060 case tok::kw___funcref:
4061 ParseWebAssemblyFuncrefTypeAttribute(attrs&: DS.getAttributes());
4062 continue;
4063
4064 // Borland single token adornments.
4065 case tok::kw___pascal:
4066 ParseBorlandTypeAttributes(attrs&: DS.getAttributes());
4067 continue;
4068
4069 // OpenCL single token adornments.
4070 case tok::kw___kernel:
4071 ParseOpenCLKernelAttributes(attrs&: DS.getAttributes());
4072 continue;
4073
4074 // CUDA/HIP single token adornments.
4075 case tok::kw___noinline__:
4076 ParseCUDAFunctionAttributes(attrs&: DS.getAttributes());
4077 continue;
4078
4079 // Nullability type specifiers.
4080 case tok::kw__Nonnull:
4081 case tok::kw__Nullable:
4082 case tok::kw__Nullable_result:
4083 case tok::kw__Null_unspecified:
4084 ParseNullabilityTypeSpecifiers(attrs&: DS.getAttributes());
4085 continue;
4086
4087 // Objective-C 'kindof' types.
4088 case tok::kw___kindof:
4089 DS.getAttributes().addNew(attrName: Tok.getIdentifierInfo(), attrRange: Loc,
4090 scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
4091 form: tok::kw___kindof);
4092 (void)ConsumeToken();
4093 continue;
4094
4095 // storage-class-specifier
4096 case tok::kw_typedef:
4097 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_typedef, Loc,
4098 PrevSpec, DiagID, Policy);
4099 isStorageClass = true;
4100 break;
4101 case tok::kw_extern:
4102 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
4103 Diag(Tok, DiagID: diag::ext_thread_before) << "extern";
4104 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_extern, Loc,
4105 PrevSpec, DiagID, Policy);
4106 isStorageClass = true;
4107 break;
4108 case tok::kw___private_extern__:
4109 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_private_extern,
4110 Loc, PrevSpec, DiagID, Policy);
4111 isStorageClass = true;
4112 break;
4113 case tok::kw_static:
4114 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
4115 Diag(Tok, DiagID: diag::ext_thread_before) << "static";
4116 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_static, Loc,
4117 PrevSpec, DiagID, Policy);
4118 isStorageClass = true;
4119 break;
4120 case tok::kw_auto:
4121 if (getLangOpts().CPlusPlus11 || getLangOpts().C23) {
4122 auto MayBeTypeSpecifier = [&]() {
4123 // In pre-C23 C, auto can be used as a storage-class specifier.
4124 // C23 removes auto from the storage-class specifiers and repurposes
4125 // it for type inference (6.7.10).
4126 if (getLangOpts().C23 && DS.hasTypeSpecifier() &&
4127 DS.getTypeSpecType() != DeclSpec::TST_auto)
4128 return true;
4129
4130 unsigned I = 1;
4131 while (true) {
4132 const Token &T = GetLookAheadToken(N: I);
4133 if (isKnownToBeTypeSpecifier(Tok: T))
4134 return true;
4135
4136 if (getLangOpts().C23 && isTypeSpecifierQualifier(Tok: T))
4137 ++I;
4138 else
4139 return false;
4140 }
4141 };
4142
4143 if (MayBeTypeSpecifier()) {
4144 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_auto, Loc,
4145 PrevSpec, DiagID, Policy);
4146 if (!isInvalid && !getLangOpts().C23)
4147 Diag(Tok, DiagID: diag::ext_auto_storage_class)
4148 << FixItHint::CreateRemoval(RemoveRange: DS.getStorageClassSpecLoc());
4149 } else
4150 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_auto, Loc, PrevSpec,
4151 DiagID, Policy);
4152 } else
4153 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_auto, Loc,
4154 PrevSpec, DiagID, Policy);
4155 isStorageClass = true;
4156 break;
4157 case tok::kw___auto_type:
4158 Diag(Tok, DiagID: diag::ext_auto_type);
4159 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_auto_type, Loc, PrevSpec,
4160 DiagID, Policy);
4161 break;
4162 case tok::kw_register:
4163 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_register, Loc,
4164 PrevSpec, DiagID, Policy);
4165 isStorageClass = true;
4166 break;
4167 case tok::kw_mutable:
4168 isInvalid = DS.SetStorageClassSpec(S&: Actions, SC: DeclSpec::SCS_mutable, Loc,
4169 PrevSpec, DiagID, Policy);
4170 isStorageClass = true;
4171 break;
4172 case tok::kw___thread:
4173 isInvalid = DS.SetStorageClassSpecThread(TSC: DeclSpec::TSCS___thread, Loc,
4174 PrevSpec, DiagID);
4175 isStorageClass = true;
4176 break;
4177 case tok::kw_thread_local:
4178 if (getLangOpts().C23)
4179 Diag(Tok, DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
4180 // We map thread_local to _Thread_local in C23 mode so it retains the C
4181 // semantics rather than getting the C++ semantics.
4182 // FIXME: diagnostics will show _Thread_local when the user wrote
4183 // thread_local in source in C23 mode; we need some general way to
4184 // identify which way the user spelled the keyword in source.
4185 isInvalid = DS.SetStorageClassSpecThread(
4186 TSC: getLangOpts().C23 ? DeclSpec::TSCS__Thread_local
4187 : DeclSpec::TSCS_thread_local,
4188 Loc, PrevSpec, DiagID);
4189 isStorageClass = true;
4190 break;
4191 case tok::kw__Thread_local:
4192 diagnoseUseOfC11Keyword(Tok);
4193 isInvalid = DS.SetStorageClassSpecThread(TSC: DeclSpec::TSCS__Thread_local,
4194 Loc, PrevSpec, DiagID);
4195 isStorageClass = true;
4196 break;
4197
4198 // function-specifier
4199 case tok::kw_inline:
4200 isInvalid = DS.setFunctionSpecInline(Loc, PrevSpec, DiagID);
4201 break;
4202 case tok::kw_virtual:
4203 // C++ for OpenCL does not allow virtual function qualifier, to avoid
4204 // function pointers restricted in OpenCL v2.0 s6.9.a.
4205 if (getLangOpts().OpenCLCPlusPlus &&
4206 !getActions().getOpenCLOptions().isAvailableOption(
4207 Ext: "__cl_clang_function_pointers", LO: getLangOpts())) {
4208 DiagID = diag::err_openclcxx_virtual_function;
4209 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
4210 isInvalid = true;
4211 } else if (getLangOpts().HLSL) {
4212 DiagID = diag::err_hlsl_virtual_function;
4213 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
4214 isInvalid = true;
4215 } else {
4216 isInvalid = DS.setFunctionSpecVirtual(Loc, PrevSpec, DiagID);
4217 }
4218 break;
4219 case tok::kw_explicit: {
4220 SourceLocation ExplicitLoc = Loc;
4221 SourceLocation CloseParenLoc;
4222 ExplicitSpecifier ExplicitSpec(nullptr, ExplicitSpecKind::ResolvedTrue);
4223 ConsumedEnd = ExplicitLoc;
4224 ConsumeToken(); // kw_explicit
4225 if (Tok.is(K: tok::l_paren)) {
4226 if (getLangOpts().CPlusPlus20 || isExplicitBool() == TPResult::True) {
4227 Diag(Loc: Tok.getLocation(), DiagID: getLangOpts().CPlusPlus20
4228 ? diag::warn_cxx17_compat_explicit_bool
4229 : diag::ext_explicit_bool);
4230
4231 ExprResult ExplicitExpr(static_cast<Expr *>(nullptr));
4232 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
4233 Tracker.consumeOpen();
4234
4235 EnterExpressionEvaluationContext ConstantEvaluated(
4236 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4237
4238 ExplicitExpr = ParseConstantExpressionInExprEvalContext();
4239 ConsumedEnd = Tok.getLocation();
4240 if (ExplicitExpr.isUsable()) {
4241 CloseParenLoc = Tok.getLocation();
4242 Tracker.consumeClose();
4243 ExplicitSpec =
4244 Actions.ActOnExplicitBoolSpecifier(E: ExplicitExpr.get());
4245 } else
4246 Tracker.skipToEnd();
4247 } else {
4248 Diag(Loc: Tok.getLocation(), DiagID: diag::warn_cxx20_compat_explicit_bool);
4249 }
4250 }
4251 isInvalid = DS.setFunctionSpecExplicit(Loc: ExplicitLoc, PrevSpec, DiagID,
4252 ExplicitSpec, CloseParenLoc);
4253 break;
4254 }
4255 case tok::kw__Noreturn:
4256 diagnoseUseOfC11Keyword(Tok);
4257 isInvalid = DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
4258 break;
4259
4260 // friend
4261 case tok::kw_friend:
4262 if (DSContext == DeclSpecContext::DSC_class) {
4263 isInvalid = DS.SetFriendSpec(Loc, PrevSpec, DiagID);
4264 Scope *CurS = getCurScope();
4265 if (!isInvalid && CurS)
4266 CurS->setFlags(CurS->getFlags() | Scope::FriendScope);
4267 } else {
4268 PrevSpec = ""; // not actually used by the diagnostic
4269 DiagID = diag::err_friend_invalid_in_context;
4270 isInvalid = true;
4271 }
4272 break;
4273
4274 // Modules
4275 case tok::kw___module_private__:
4276 isInvalid = DS.setModulePrivateSpec(Loc, PrevSpec, DiagID);
4277 break;
4278
4279 // constexpr, consteval, constinit specifiers
4280 case tok::kw_constexpr:
4281 if (getLangOpts().C23)
4282 Diag(Tok, DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
4283 isInvalid = DS.SetConstexprSpec(ConstexprKind: ConstexprSpecKind::Constexpr, Loc,
4284 PrevSpec, DiagID);
4285 break;
4286 case tok::kw_consteval:
4287 isInvalid = DS.SetConstexprSpec(ConstexprKind: ConstexprSpecKind::Consteval, Loc,
4288 PrevSpec, DiagID);
4289 break;
4290 case tok::kw_constinit:
4291 isInvalid = DS.SetConstexprSpec(ConstexprKind: ConstexprSpecKind::Constinit, Loc,
4292 PrevSpec, DiagID);
4293 break;
4294
4295 // type-specifier
4296 case tok::kw_short:
4297 if (!getLangOpts().NativeInt16Type) {
4298 Diag(Tok, DiagID: diag::err_unknown_typename) << Tok.getName();
4299 DS.SetTypeSpecError();
4300 DS.SetRangeEnd(Tok.getLocation());
4301 ConsumeToken();
4302 goto DoneWithDeclSpec;
4303 }
4304 isInvalid = DS.SetTypeSpecWidth(W: TypeSpecifierWidth::Short, Loc, PrevSpec,
4305 DiagID, Policy);
4306 break;
4307 case tok::kw_long:
4308 if (DS.getTypeSpecWidth() != TypeSpecifierWidth::Long)
4309 isInvalid = DS.SetTypeSpecWidth(W: TypeSpecifierWidth::Long, Loc, PrevSpec,
4310 DiagID, Policy);
4311 else
4312 isInvalid = DS.SetTypeSpecWidth(W: TypeSpecifierWidth::LongLong, Loc,
4313 PrevSpec, DiagID, Policy);
4314 break;
4315 case tok::kw___int64:
4316 isInvalid = DS.SetTypeSpecWidth(W: TypeSpecifierWidth::LongLong, Loc,
4317 PrevSpec, DiagID, Policy);
4318 break;
4319 case tok::kw_signed:
4320 isInvalid =
4321 DS.SetTypeSpecSign(S: TypeSpecifierSign::Signed, Loc, PrevSpec, DiagID);
4322 break;
4323 case tok::kw_unsigned:
4324 isInvalid = DS.SetTypeSpecSign(S: TypeSpecifierSign::Unsigned, Loc, PrevSpec,
4325 DiagID);
4326 break;
4327 case tok::kw__Complex:
4328 if (!getLangOpts().C99)
4329 Diag(Tok, DiagID: diag::ext_c99_feature) << Tok.getName();
4330 isInvalid = DS.SetTypeSpecComplex(C: DeclSpec::TSC_complex, Loc, PrevSpec,
4331 DiagID);
4332 break;
4333 case tok::kw__Imaginary:
4334 if (!getLangOpts().C99)
4335 Diag(Tok, DiagID: diag::ext_c99_feature) << Tok.getName();
4336 isInvalid = DS.SetTypeSpecComplex(C: DeclSpec::TSC_imaginary, Loc, PrevSpec,
4337 DiagID);
4338 break;
4339 case tok::kw_void:
4340 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_void, Loc, PrevSpec,
4341 DiagID, Policy);
4342 break;
4343 case tok::kw_char:
4344 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_char, Loc, PrevSpec,
4345 DiagID, Policy);
4346 break;
4347 case tok::kw_int:
4348 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_int, Loc, PrevSpec,
4349 DiagID, Policy);
4350 break;
4351 case tok::kw__ExtInt:
4352 case tok::kw__BitInt: {
4353 DiagnoseBitIntUse(Tok);
4354 ExprResult ER = ParseExtIntegerArgument();
4355 if (ER.isInvalid())
4356 continue;
4357 isInvalid = DS.SetBitIntType(KWLoc: Loc, BitWidth: ER.get(), PrevSpec, DiagID, Policy);
4358 ConsumedEnd = PrevTokLocation;
4359 break;
4360 }
4361 case tok::kw___int128:
4362 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_int128, Loc, PrevSpec,
4363 DiagID, Policy);
4364 break;
4365 case tok::kw_half:
4366 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_half, Loc, PrevSpec,
4367 DiagID, Policy);
4368 break;
4369 case tok::kw___bf16:
4370 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_BFloat16, Loc, PrevSpec,
4371 DiagID, Policy);
4372 break;
4373 case tok::kw_float:
4374 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_float, Loc, PrevSpec,
4375 DiagID, Policy);
4376 break;
4377 case tok::kw_double:
4378 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_double, Loc, PrevSpec,
4379 DiagID, Policy);
4380 break;
4381 case tok::kw__Float16:
4382 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_float16, Loc, PrevSpec,
4383 DiagID, Policy);
4384 break;
4385 case tok::kw__Accum:
4386 assert(getLangOpts().FixedPoint &&
4387 "This keyword is only used when fixed point types are enabled "
4388 "with `-ffixed-point`");
4389 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_accum, Loc, PrevSpec, DiagID,
4390 Policy);
4391 break;
4392 case tok::kw__Fract:
4393 assert(getLangOpts().FixedPoint &&
4394 "This keyword is only used when fixed point types are enabled "
4395 "with `-ffixed-point`");
4396 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_fract, Loc, PrevSpec, DiagID,
4397 Policy);
4398 break;
4399 case tok::kw__Sat:
4400 assert(getLangOpts().FixedPoint &&
4401 "This keyword is only used when fixed point types are enabled "
4402 "with `-ffixed-point`");
4403 isInvalid = DS.SetTypeSpecSat(Loc, PrevSpec, DiagID);
4404 break;
4405 case tok::kw___float128:
4406 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_float128, Loc, PrevSpec,
4407 DiagID, Policy);
4408 break;
4409 case tok::kw___ibm128:
4410 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_ibm128, Loc, PrevSpec,
4411 DiagID, Policy);
4412 break;
4413 case tok::kw_wchar_t:
4414 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_wchar, Loc, PrevSpec,
4415 DiagID, Policy);
4416 break;
4417 case tok::kw_char8_t:
4418 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_char8, Loc, PrevSpec,
4419 DiagID, Policy);
4420 break;
4421 case tok::kw_char16_t:
4422 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_char16, Loc, PrevSpec,
4423 DiagID, Policy);
4424 break;
4425 case tok::kw_char32_t:
4426 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_char32, Loc, PrevSpec,
4427 DiagID, Policy);
4428 break;
4429 case tok::kw_bool:
4430 if (getLangOpts().C23)
4431 Diag(Tok, DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
4432 [[fallthrough]];
4433 case tok::kw__Bool:
4434 if (Tok.is(K: tok::kw__Bool) && !getLangOpts().C99)
4435 Diag(Tok, DiagID: diag::ext_c99_feature) << Tok.getName();
4436
4437 if (Tok.is(K: tok::kw_bool) &&
4438 DS.getTypeSpecType() != DeclSpec::TST_unspecified &&
4439 DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
4440 PrevSpec = ""; // Not used by the diagnostic.
4441 DiagID = diag::err_bool_redeclaration;
4442 // For better error recovery.
4443 Tok.setKind(tok::identifier);
4444 isInvalid = true;
4445 } else {
4446 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_bool, Loc, PrevSpec,
4447 DiagID, Policy);
4448 }
4449 break;
4450 case tok::kw__Decimal32:
4451 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_decimal32, Loc, PrevSpec,
4452 DiagID, Policy);
4453 break;
4454 case tok::kw__Decimal64:
4455 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_decimal64, Loc, PrevSpec,
4456 DiagID, Policy);
4457 break;
4458 case tok::kw__Decimal128:
4459 isInvalid = DS.SetTypeSpecType(T: DeclSpec::TST_decimal128, Loc, PrevSpec,
4460 DiagID, Policy);
4461 break;
4462 case tok::kw___vector:
4463 isInvalid = DS.SetTypeAltiVecVector(isAltiVecVector: true, Loc, PrevSpec, DiagID, Policy);
4464 break;
4465 case tok::kw___pixel:
4466 isInvalid = DS.SetTypeAltiVecPixel(isAltiVecPixel: true, Loc, PrevSpec, DiagID, Policy);
4467 break;
4468 case tok::kw___bool:
4469 isInvalid = DS.SetTypeAltiVecBool(isAltiVecBool: true, Loc, PrevSpec, DiagID, Policy);
4470 break;
4471 case tok::kw_pipe:
4472 if (!getLangOpts().OpenCL ||
4473 getLangOpts().getOpenCLCompatibleVersion() < 200) {
4474 // OpenCL 2.0 and later define this keyword. OpenCL 1.2 and earlier
4475 // should support the "pipe" word as identifier.
4476 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
4477 Tok.setKind(tok::identifier);
4478 goto DoneWithDeclSpec;
4479 } else if (!getLangOpts().OpenCLPipes) {
4480 DiagID = diag::err_opencl_unknown_type_specifier;
4481 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
4482 isInvalid = true;
4483 } else
4484 isInvalid = DS.SetTypePipe(isPipe: true, Loc, PrevSpec, DiagID, Policy);
4485 break;
4486// We only need to enumerate each image type once.
4487#define IMAGE_READ_WRITE_TYPE(Type, Id, Ext)
4488#define IMAGE_WRITE_TYPE(Type, Id, Ext)
4489#define IMAGE_READ_TYPE(ImgType, Id, Ext) \
4490 case tok::kw_##ImgType##_t: \
4491 if (!handleOpenCLImageKW(Ext, DeclSpec::TST_##ImgType##_t)) \
4492 goto DoneWithDeclSpec; \
4493 break;
4494#include "clang/Basic/OpenCLImageTypes.def"
4495 case tok::kw___unknown_anytype:
4496 isInvalid = DS.SetTypeSpecType(T: TST_unknown_anytype, Loc,
4497 PrevSpec, DiagID, Policy);
4498 break;
4499
4500 // class-specifier:
4501 case tok::kw_class:
4502 case tok::kw_struct:
4503 case tok::kw___interface:
4504 case tok::kw_union: {
4505 tok::TokenKind Kind = Tok.getKind();
4506 ConsumeToken();
4507
4508 // These are attributes following class specifiers.
4509 // To produce better diagnostic, we parse them when
4510 // parsing class specifier.
4511 ParsedAttributes Attributes(AttrFactory);
4512 ParseClassSpecifier(TagTokKind: Kind, TagLoc: Loc, DS, TemplateInfo, AS,
4513 EnteringContext, DSC: DSContext, Attributes);
4514
4515 // If there are attributes following class specifier,
4516 // take them over and handle them here.
4517 if (!Attributes.empty()) {
4518 AttrsLastTime = true;
4519 attrs.takeAllAppendingFrom(Other&: Attributes);
4520 }
4521 continue;
4522 }
4523
4524 // enum-specifier:
4525 case tok::kw_enum:
4526 ConsumeToken();
4527 ParseEnumSpecifier(TagLoc: Loc, DS, TemplateInfo, AS, DSC: DSContext);
4528 continue;
4529
4530 // cv-qualifier:
4531 case tok::kw_const:
4532 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_const, Loc, PrevSpec, DiagID,
4533 Lang: getLangOpts());
4534 break;
4535 case tok::kw_volatile:
4536 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
4537 Lang: getLangOpts());
4538 break;
4539 case tok::kw_restrict:
4540 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
4541 Lang: getLangOpts());
4542 break;
4543 case tok::kw___ob_wrap:
4544 if (!getLangOpts().OverflowBehaviorTypes) {
4545 Diag(Loc, DiagID: diag::warn_overflow_behavior_keyword_disabled)
4546 << tok::getKeywordSpelling(Kind: Tok.getKind());
4547 break;
4548 }
4549 isInvalid = DS.SetOverflowBehavior(
4550 Kind: OverflowBehaviorType::OverflowBehaviorKind::Wrap, Loc, PrevSpec,
4551 DiagID);
4552 break;
4553 case tok::kw___ob_trap:
4554 if (!getLangOpts().OverflowBehaviorTypes) {
4555 Diag(Loc, DiagID: diag::warn_overflow_behavior_keyword_disabled)
4556 << tok::getKeywordSpelling(Kind: Tok.getKind());
4557 break;
4558 }
4559 isInvalid = DS.SetOverflowBehavior(
4560 Kind: OverflowBehaviorType::OverflowBehaviorKind::Trap, Loc, PrevSpec,
4561 DiagID);
4562 break;
4563
4564 // C++ typename-specifier:
4565 case tok::kw_typename:
4566 if (TryAnnotateTypeOrScopeToken()) {
4567 DS.SetTypeSpecError();
4568 goto DoneWithDeclSpec;
4569 }
4570 if (!Tok.is(K: tok::kw_typename))
4571 continue;
4572 break;
4573
4574 // C23/GNU typeof support.
4575 case tok::kw_typeof:
4576 case tok::kw_typeof_unqual:
4577 ParseTypeofSpecifier(DS);
4578 continue;
4579
4580 case tok::annot_decltype:
4581 ParseDecltypeSpecifier(DS);
4582 continue;
4583
4584 case tok::annot_pack_indexing_type:
4585 ParsePackIndexingType(DS);
4586 continue;
4587
4588 case tok::annot_pragma_pack:
4589 HandlePragmaPack();
4590 continue;
4591
4592 case tok::annot_pragma_ms_pragma:
4593 HandlePragmaMSPragma();
4594 continue;
4595
4596 case tok::annot_pragma_ms_vtordisp:
4597 HandlePragmaMSVtorDisp();
4598 continue;
4599
4600 case tok::annot_pragma_ms_pointers_to_members:
4601 HandlePragmaMSPointersToMembers();
4602 continue;
4603
4604 case tok::annot_pragma_export:
4605 HandlePragmaExport();
4606 continue;
4607
4608#define TRANSFORM_TYPE_TRAIT_DEF(_, Trait) case tok::kw___##Trait:
4609#include "clang/Basic/BuiltinTraits.inc"
4610 // HACK: libstdc++ already uses '__remove_cv' as an alias template so we
4611 // work around this by expecting all transform type traits to be suffixed
4612 // with '('. They're an identifier otherwise.
4613 if (!MaybeParseTypeTransformTypeSpecifier(DS))
4614 goto ParseIdentifier;
4615 continue;
4616
4617 case tok::kw__Atomic:
4618 // C11 6.7.2.4/4:
4619 // If the _Atomic keyword is immediately followed by a left parenthesis,
4620 // it is interpreted as a type specifier (with a type name), not as a
4621 // type qualifier.
4622 diagnoseUseOfC11Keyword(Tok);
4623 if (NextToken().is(K: tok::l_paren)) {
4624 ParseAtomicSpecifier(DS);
4625 continue;
4626 }
4627 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
4628 Lang: getLangOpts());
4629 break;
4630
4631 // OpenCL address space qualifiers:
4632 case tok::kw___generic:
4633 // generic address space is introduced only in OpenCL v2.0
4634 // see OpenCL C Spec v2.0 s6.5.5
4635 // OpenCL v3.0 introduces __opencl_c_generic_address_space
4636 // feature macro to indicate if generic address space is supported
4637 if (!Actions.getLangOpts().OpenCLGenericAddressSpace) {
4638 DiagID = diag::err_opencl_unknown_type_specifier;
4639 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
4640 isInvalid = true;
4641 break;
4642 }
4643 [[fallthrough]];
4644 case tok::kw_private:
4645 // It's fine (but redundant) to check this for __generic on the
4646 // fallthrough path; we only form the __generic token in OpenCL mode.
4647 if (!getLangOpts().OpenCL)
4648 goto DoneWithDeclSpec;
4649 [[fallthrough]];
4650 case tok::kw___private:
4651 case tok::kw___global:
4652 case tok::kw___local:
4653 case tok::kw___constant:
4654 // OpenCL access qualifiers:
4655 case tok::kw___read_only:
4656 case tok::kw___write_only:
4657 case tok::kw___read_write:
4658 ParseOpenCLQualifiers(Attrs&: DS.getAttributes());
4659 break;
4660 case tok::kw_row_major:
4661 case tok::kw_column_major:
4662 case tok::kw_groupshared:
4663 case tok::kw_in:
4664 case tok::kw_inout:
4665 case tok::kw_out:
4666 // NOTE: ParseHLSLQualifiers will consume the qualifier token.
4667 ParseHLSLQualifiers(Attrs&: DS.getAttributes());
4668 continue;
4669
4670#define HLSL_INTANGIBLE_TYPE(Name, Id, SingletonId) \
4671 case tok::kw_##Name: \
4672 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_##Name, Loc, PrevSpec, \
4673 DiagID, Policy); \
4674 break;
4675#include "clang/Basic/HLSLIntangibleTypes.def"
4676
4677 case tok::less:
4678 // GCC ObjC supports types like "<SomeProtocol>" as a synonym for
4679 // "id<SomeProtocol>". This is hopelessly old fashioned and dangerous,
4680 // but we support it.
4681 if (DS.hasTypeSpecifier() || !getLangOpts().ObjC)
4682 goto DoneWithDeclSpec;
4683
4684 SourceLocation StartLoc = Tok.getLocation();
4685 SourceLocation EndLoc;
4686 TypeResult Type = parseObjCProtocolQualifierType(rAngleLoc&: EndLoc);
4687 if (Type.isUsable()) {
4688 if (DS.SetTypeSpecType(T: DeclSpec::TST_typename, TagKwLoc: StartLoc, TagNameLoc: StartLoc,
4689 PrevSpec, DiagID, Rep: Type.get(),
4690 Policy: Actions.getASTContext().getPrintingPolicy()))
4691 Diag(Loc: StartLoc, DiagID) << PrevSpec;
4692
4693 DS.SetRangeEnd(EndLoc);
4694 } else {
4695 DS.SetTypeSpecError();
4696 }
4697
4698 // Need to support trailing type qualifiers (e.g. "id<p> const").
4699 // If a type specifier follows, it will be diagnosed elsewhere.
4700 continue;
4701 }
4702
4703 DS.SetRangeEnd(ConsumedEnd.isValid() ? ConsumedEnd : Tok.getLocation());
4704
4705 // If the specifier wasn't legal, issue a diagnostic.
4706 if (isInvalid) {
4707 assert(PrevSpec && "Method did not return previous specifier!");
4708 assert(DiagID);
4709
4710 if (DiagID == diag::ext_duplicate_declspec ||
4711 DiagID == diag::ext_warn_duplicate_declspec ||
4712 DiagID == diag::err_duplicate_declspec)
4713 Diag(Loc, DiagID) << PrevSpec
4714 << FixItHint::CreateRemoval(
4715 RemoveRange: SourceRange(Loc, DS.getEndLoc()));
4716 else if (DiagID == diag::err_opencl_unknown_type_specifier) {
4717 Diag(Loc, DiagID) << getLangOpts().getOpenCLVersionString() << PrevSpec
4718 << isStorageClass;
4719 } else
4720 Diag(Loc, DiagID) << PrevSpec;
4721 }
4722
4723 if (DiagID != diag::err_bool_redeclaration && ConsumedEnd.isInvalid())
4724 // After an error the next token can be an annotation token.
4725 ConsumeAnyToken();
4726
4727 AttrsLastTime = false;
4728 }
4729}
4730
4731static void DiagnoseCountAttributedTypeInUnnamedAnon(ParsingDeclSpec &DS,
4732 Parser &P) {
4733
4734 if (DS.getTypeSpecType() != DeclSpec::TST_struct)
4735 return;
4736
4737 auto *RD = dyn_cast<RecordDecl>(Val: DS.getRepAsDecl());
4738 // We're only interested in unnamed, non-anonymous struct
4739 if (!RD || !RD->getName().empty() || RD->isAnonymousStructOrUnion())
4740 return;
4741
4742 for (auto *I : RD->decls()) {
4743 auto *VD = dyn_cast<ValueDecl>(Val: I);
4744 if (!VD)
4745 continue;
4746
4747 auto *CAT = VD->getType()->getAs<CountAttributedType>();
4748 if (!CAT)
4749 continue;
4750
4751 for (const auto &DD : CAT->dependent_decls()) {
4752 if (!RD->containsDecl(D: DD.getDecl())) {
4753 P.Diag(Loc: VD->getBeginLoc(), DiagID: diag::err_count_attr_param_not_in_same_struct)
4754 << DD.getDecl() << CAT->getKind() << CAT->isArrayType();
4755 P.Diag(Loc: DD.getDecl()->getBeginLoc(),
4756 DiagID: diag::note_flexible_array_counted_by_attr_field)
4757 << DD.getDecl();
4758 }
4759 }
4760 }
4761}
4762
4763void Parser::ParseStructDeclaration(
4764 ParsingDeclSpec &DS,
4765 llvm::function_ref<Decl *(ParsingFieldDeclarator &)> FieldsCallback,
4766 LateParsedAttrList *LateFieldAttrs) {
4767
4768 if (Tok.is(K: tok::kw___extension__)) {
4769 // __extension__ silences extension warnings in the subexpression.
4770 ExtensionRAIIObject O(Diags); // Use RAII to do this.
4771 ConsumeToken();
4772 return ParseStructDeclaration(DS, FieldsCallback, LateFieldAttrs);
4773 }
4774
4775 // Parse leading attributes.
4776 ParsedAttributes Attrs(AttrFactory);
4777 MaybeParseCXX11Attributes(Attrs);
4778
4779 // Parse the common specifier-qualifiers-list piece.
4780 ParseSpecifierQualifierList(DS);
4781
4782 // If there are no declarators, this is a free-standing declaration
4783 // specifier. Let the actions module cope with it.
4784 if (Tok.is(K: tok::semi)) {
4785 // C23 6.7.2.1p9 : "The optional attribute specifier sequence in a
4786 // member declaration appertains to each of the members declared by the
4787 // member declarator list; it shall not appear if the optional member
4788 // declarator list is omitted."
4789 ProhibitAttributes(Attrs);
4790 RecordDecl *AnonRecord = nullptr;
4791 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
4792 S: getCurScope(), AS: AS_none, DS, DeclAttrs: ParsedAttributesView::none(), AnonRecord);
4793 assert(!AnonRecord && "Did not expect anonymous struct or union here");
4794 DS.complete(D: TheDecl);
4795 return;
4796 }
4797
4798 // Read struct-declarators until we find the semicolon.
4799 bool FirstDeclarator = true;
4800 SourceLocation CommaLoc;
4801 while (true) {
4802 ParsingFieldDeclarator DeclaratorInfo(*this, DS, Attrs);
4803 DeclaratorInfo.D.setCommaLoc(CommaLoc);
4804
4805 // Attributes are only allowed here on successive declarators.
4806 if (!FirstDeclarator) {
4807 // However, this does not apply for [[]] attributes (which could show up
4808 // before or after the __attribute__ attributes).
4809 DiagnoseAndSkipCXX11Attributes();
4810 MaybeParseGNUAttributes(D&: DeclaratorInfo.D);
4811 DiagnoseAndSkipCXX11Attributes();
4812 }
4813
4814 /// struct-declarator: declarator
4815 /// struct-declarator: declarator[opt] ':' constant-expression
4816 if (Tok.isNot(K: tok::colon)) {
4817 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
4818 ColonProtectionRAIIObject X(*this);
4819 ParseDeclarator(D&: DeclaratorInfo.D);
4820 } else
4821 DeclaratorInfo.D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
4822
4823 // Here, we now know that the unnamed struct is not an anonymous struct.
4824 // Report an error if a counted_by attribute refers to a field in a
4825 // different named struct.
4826 DiagnoseCountAttributedTypeInUnnamedAnon(DS, P&: *this);
4827
4828 if (TryConsumeToken(Expected: tok::colon)) {
4829 ExprResult Res(ParseConstantExpression());
4830 if (Res.isInvalid())
4831 SkipUntil(T: tok::semi, Flags: StopBeforeMatch);
4832 else
4833 DeclaratorInfo.BitfieldSize = Res.get();
4834 }
4835
4836 // If attributes exist after the declarator, parse them.
4837 MaybeParseGNUAttributes(D&: DeclaratorInfo.D, LateAttrs: LateFieldAttrs);
4838
4839 // We're done with this declarator; invoke the callback.
4840 Decl *Field = FieldsCallback(DeclaratorInfo);
4841 if (Field)
4842 DistributeCLateParsedAttrs(Dcl: Field, LateAttrs: LateFieldAttrs);
4843
4844 // If we don't have a comma, it is either the end of the list (a ';')
4845 // or an error, bail out.
4846 if (!TryConsumeToken(Expected: tok::comma, Loc&: CommaLoc))
4847 return;
4848
4849 FirstDeclarator = false;
4850 }
4851}
4852
4853ParsedAttributes Parser::ParseLexedCAttributeTokens(LateParsedAttribute &LA) {
4854 // Create a fake EOF so that attribute parsing won't go off the end of the
4855 // attribute.
4856 Token AttrEnd;
4857 AttrEnd.startToken();
4858 AttrEnd.setKind(tok::eof);
4859 AttrEnd.setLocation(Tok.getLocation());
4860 AttrEnd.setEofData(LA.Toks.data());
4861 LA.Toks.push_back(Elt: AttrEnd);
4862
4863 // Append the current token at the end of the new token stream so that it
4864 // doesn't get lost.
4865 LA.Toks.push_back(Elt: Tok);
4866 PP.EnterTokenStream(Toks: LA.Toks, /*DisableMacroExpansion=*/true,
4867 /*IsReinject=*/true);
4868 // Drop the current token and bring the first cached one. It's the same token
4869 // as when we entered this function.
4870 ConsumeAnyToken(/*ConsumeCodeCompletionTok=*/true);
4871
4872 ParsedAttributes Attrs(AttrFactory);
4873
4874 assert(LA.Decls.size() <= 1 &&
4875 "late field attribute expects to have at most one declaration.");
4876
4877 // Dispatch based on the attribute and parse it
4878 ParseGNUAttributeArgs(AttrName: &LA.AttrName, AttrNameLoc: LA.AttrNameLoc, Attrs, EndLoc: nullptr, ScopeName: nullptr,
4879 ScopeLoc: SourceLocation(), Form: ParsedAttr::Form::GNU(), D: nullptr);
4880
4881 // Due to a parsing error, we either went over the cached tokens or
4882 // there are still cached tokens left, so we skip the leftover tokens.
4883 while (Tok.isNot(K: tok::eof))
4884 ConsumeAnyToken();
4885
4886 // Consume the fake EOF token if it's there
4887 if (Tok.is(K: tok::eof) && Tok.getEofData() == AttrEnd.getEofData())
4888 ConsumeAnyToken();
4889
4890 return Attrs;
4891}
4892
4893void Parser::ParseLexedTypeAttribute(LateParsedTypeAttribute &LA,
4894 ParsedAttributes &OutAttrs) {
4895 ParsedAttributes Attrs = ParseLexedCAttributeTokens(LA);
4896 OutAttrs.takeAllAppendingFrom(Other&: Attrs);
4897}
4898
4899void LateParsedTypeAttribute::ParseInto(ParsedAttributes &OutAttrs) {
4900 // Delegate to the Parser that created this attribute
4901 Self->ParseLexedTypeAttribute(LA&: *this, OutAttrs);
4902}
4903
4904void Parser::TakeTypeAttrsAppendingFrom(LateParsedAttrList &To,
4905 LateParsedAttrList &From) {
4906 LateParsedAttrList::iterator It =
4907 llvm::remove_if(Range&: From, P: [&](LateParsedAttribute *LA) {
4908 if (isa<LateParsedTypeAttribute>(Val: LA)) {
4909 To.push_back(Elt: LA);
4910 return true;
4911 }
4912 return false;
4913 });
4914 From.erase(CS: It, CE: From.end());
4915}
4916
4917void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
4918 DeclSpec::TST TagType, RecordDecl *TagDecl) {
4919 PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
4920 "parsing struct/union body");
4921 assert(!getLangOpts().CPlusPlus && "C++ declarations not supported");
4922
4923 BalancedDelimiterTracker T(*this, tok::l_brace);
4924 if (T.consumeOpen())
4925 return;
4926
4927 ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope);
4928 Actions.ActOnTagStartDefinition(S: getCurScope(), TagDecl);
4929
4930 // `LateAttrParseExperimentalExtOnly=true` requests that only attributes
4931 // marked with `LateAttrParseExperimentalExt` are late parsed.
4932 LateParsedAttrList LateFieldAttrs(/*PSoon=*/true,
4933 /*LateAttrParseExperimentalExtOnly=*/true);
4934
4935 // While we still have something to read, read the declarations in the struct.
4936 while (!tryParseMisplacedModuleImport() && Tok.isNot(K: tok::r_brace) &&
4937 Tok.isNot(K: tok::eof)) {
4938 // Each iteration of this loop reads one struct-declaration.
4939
4940 // Check for extraneous top-level semicolon.
4941 if (Tok.is(K: tok::semi)) {
4942 ConsumeExtraSemi(Kind: ExtraSemiKind::InsideStruct, T: TagType);
4943 continue;
4944 }
4945
4946 // Parse _Static_assert declaration.
4947 if (Tok.isOneOf(Ks: tok::kw__Static_assert, Ks: tok::kw_static_assert)) {
4948 SourceLocation DeclEnd;
4949 ParseStaticAssertDeclaration(DeclEnd);
4950 continue;
4951 }
4952
4953 if (Tok.is(K: tok::annot_pragma_pack)) {
4954 HandlePragmaPack();
4955 continue;
4956 }
4957
4958 if (Tok.is(K: tok::annot_pragma_align)) {
4959 HandlePragmaAlign();
4960 continue;
4961 }
4962
4963 if (Tok.isOneOf(Ks: tok::annot_pragma_openmp, Ks: tok::annot_attr_openmp)) {
4964 // Result can be ignored, because it must be always empty.
4965 AccessSpecifier AS = AS_none;
4966 ParsedAttributes Attrs(AttrFactory);
4967 (void)ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs);
4968 continue;
4969 }
4970
4971 if (Tok.is(K: tok::annot_pragma_openacc)) {
4972 AccessSpecifier AS = AS_none;
4973 ParsedAttributes Attrs(AttrFactory);
4974 ParseOpenACCDirectiveDecl(AS, Attrs, TagType, TagDecl);
4975 continue;
4976 }
4977
4978 if (tok::isPragmaAnnotation(K: Tok.getKind())) {
4979 Diag(Loc: Tok.getLocation(), DiagID: diag::err_pragma_misplaced_in_decl)
4980 << DeclSpec::getSpecifierName(
4981 T: TagType, Policy: Actions.getASTContext().getPrintingPolicy());
4982 ConsumeAnnotationToken();
4983 continue;
4984 }
4985
4986 if (!Tok.is(K: tok::at)) {
4987 auto CFieldCallback = [&](ParsingFieldDeclarator &FD) -> Decl * {
4988 // Install the declarator into the current TagDecl.
4989 Decl *Field =
4990 Actions.ActOnField(S: getCurScope(), TagD: TagDecl,
4991 DeclStart: FD.D.getDeclSpec().getSourceRange().getBegin(),
4992 D&: FD.D, BitfieldWidth: FD.BitfieldSize);
4993 FD.complete(D: Field);
4994 return Field;
4995 };
4996
4997 // Parse all the comma separated declarators.
4998 ParsingDeclSpec DS(*this);
4999 ParseStructDeclaration(DS, FieldsCallback: CFieldCallback, LateFieldAttrs: &LateFieldAttrs);
5000 } else { // Handle @defs
5001 ConsumeToken();
5002 if (!Tok.isObjCAtKeyword(objcKey: tok::objc_defs)) {
5003 Diag(Tok, DiagID: diag::err_unexpected_at);
5004 SkipUntil(T: tok::semi);
5005 continue;
5006 }
5007 ConsumeToken();
5008 ExpectAndConsume(ExpectedTok: tok::l_paren);
5009 if (!Tok.is(K: tok::identifier)) {
5010 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
5011 SkipUntil(T: tok::semi);
5012 continue;
5013 }
5014 SmallVector<Decl *, 16> Fields;
5015 Actions.ObjC().ActOnDefs(S: getCurScope(), TagD: TagDecl, DeclStart: Tok.getLocation(),
5016 ClassName: Tok.getIdentifierInfo(), Decls&: Fields);
5017 ConsumeToken();
5018 ExpectAndConsume(ExpectedTok: tok::r_paren);
5019 }
5020
5021 if (TryConsumeToken(Expected: tok::semi))
5022 continue;
5023
5024 if (Tok.is(K: tok::r_brace)) {
5025 ExpectAndConsume(ExpectedTok: tok::semi, Diag: diag::ext_expected_semi_decl_list);
5026 break;
5027 }
5028
5029 ExpectAndConsume(ExpectedTok: tok::semi, Diag: diag::err_expected_semi_decl_list);
5030 // Skip to end of block or statement to avoid ext-warning on extra ';'.
5031 SkipUntil(T: tok::r_brace, Flags: StopAtSemi | StopBeforeMatch);
5032 // If we stopped at a ';', eat it.
5033 TryConsumeToken(Expected: tok::semi);
5034 }
5035
5036 T.consumeClose();
5037
5038 ParsedAttributes attrs(AttrFactory);
5039 // If attributes exist after struct contents, parse them.
5040 MaybeParseGNUAttributes(Attrs&: attrs, LateAttrs: &LateFieldAttrs);
5041
5042 SmallVector<Decl *, 32> FieldDecls(TagDecl->fields());
5043
5044 Actions.ActOnFields(S: getCurScope(), RecLoc: RecordLoc, TagDecl, Fields: FieldDecls,
5045 LBrac: T.getOpenLocation(), RBrac: T.getCloseLocation(), AttrList: attrs);
5046
5047 // Late parse field attributes if necessary.
5048 ParseLexedAttributeList(LAs&: LateFieldAttrs, /*D=*/nullptr, /*EnterScope=*/false,
5049 /*OnDefinition=*/false);
5050 StructScope.Exit();
5051 Actions.ActOnTagFinishDefinition(S: getCurScope(), TagDecl, BraceRange: T.getRange());
5052}
5053
5054void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
5055 const ParsedTemplateInfo &TemplateInfo,
5056 AccessSpecifier AS, DeclSpecContext DSC) {
5057 // Parse the tag portion of this.
5058 if (Tok.is(K: tok::code_completion)) {
5059 // Code completion for an enum name.
5060 cutOffParsing();
5061 Actions.CodeCompletion().CodeCompleteTag(S: getCurScope(), TagSpec: DeclSpec::TST_enum);
5062 DS.SetTypeSpecError(); // Needed by ActOnUsingDeclaration.
5063 return;
5064 }
5065
5066 // If attributes exist after tag, parse them.
5067 ParsedAttributes attrs(AttrFactory);
5068 MaybeParseAttributes(WhichAttrKinds: PAKM_GNU | PAKM_Declspec | PAKM_CXX11, Attrs&: attrs);
5069
5070 SourceLocation ScopedEnumKWLoc;
5071 bool IsScopedUsingClassTag = false;
5072
5073 // In C++11, recognize 'enum class' and 'enum struct'.
5074 if (Tok.isOneOf(Ks: tok::kw_class, Ks: tok::kw_struct) && getLangOpts().CPlusPlus) {
5075 Diag(Tok, DiagID: getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_scoped_enum
5076 : diag::ext_scoped_enum);
5077 IsScopedUsingClassTag = Tok.is(K: tok::kw_class);
5078 ScopedEnumKWLoc = ConsumeToken();
5079
5080 // Attributes are not allowed between these keywords. Diagnose,
5081 // but then just treat them like they appeared in the right place.
5082 ProhibitAttributes(Attrs&: attrs);
5083
5084 // They are allowed afterwards, though.
5085 MaybeParseAttributes(WhichAttrKinds: PAKM_GNU | PAKM_Declspec | PAKM_CXX11, Attrs&: attrs);
5086 }
5087
5088 // C++11 [temp.explicit]p12:
5089 // The usual access controls do not apply to names used to specify
5090 // explicit instantiations.
5091 // We extend this to also cover explicit specializations. Note that
5092 // we don't suppress if this turns out to be an elaborated type
5093 // specifier.
5094 bool shouldDelayDiagsInTag =
5095 (TemplateInfo.Kind == ParsedTemplateKind::ExplicitInstantiation ||
5096 TemplateInfo.Kind == ParsedTemplateKind::ExplicitSpecialization);
5097 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
5098
5099 // Determine whether this declaration is permitted to have an enum-base.
5100 AllowDefiningTypeSpec AllowEnumSpecifier =
5101 isDefiningTypeSpecifierContext(DSC, IsCPlusPlus: getLangOpts().CPlusPlus);
5102 bool CanBeOpaqueEnumDeclaration =
5103 DS.isEmpty() && isOpaqueEnumDeclarationContext(DSC);
5104 bool CanHaveEnumBase = (getLangOpts().CPlusPlus11 || getLangOpts().ObjC ||
5105 getLangOpts().MicrosoftExt) &&
5106 (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes ||
5107 CanBeOpaqueEnumDeclaration);
5108
5109 // We use a temporary scope when parsing the name specifier for a
5110 // declaration with additional invalid type specifiers.
5111 CXXScopeSpec InvalidDeclScope;
5112 CXXScopeSpec &SS =
5113 DS.hasTypeSpecifier() ? InvalidDeclScope : DS.getTypeSpecScope();
5114 if (getLangOpts().CPlusPlus) {
5115 // "enum foo : bar;" is not a potential typo for "enum foo::bar;".
5116 ColonProtectionRAIIObject X(*this);
5117
5118 CXXScopeSpec Spec;
5119 if (ParseOptionalCXXScopeSpecifier(SS&: Spec, /*ObjectType=*/nullptr,
5120 /*ObjectHasErrors=*/false,
5121 /*EnteringContext=*/true))
5122 return;
5123
5124 if (Spec.isSet() && Tok.isNot(K: tok::identifier)) {
5125 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
5126 DS.SetTypeSpecError();
5127 if (Tok.isNot(K: tok::l_brace)) {
5128 // Has no name and is not a definition.
5129 // Skip the rest of this declarator, up until the comma or semicolon.
5130 SkipUntil(T: tok::comma, Flags: StopAtSemi);
5131 return;
5132 }
5133 }
5134
5135 SS = std::move(Spec);
5136 }
5137
5138 // Must have either 'enum name' or 'enum {...}' or (rarely) 'enum : T { ... }'.
5139 if (Tok.isNot(K: tok::identifier) && Tok.isNot(K: tok::l_brace) &&
5140 Tok.isNot(K: tok::colon)) {
5141 Diag(Tok, DiagID: diag::err_expected_either) << tok::identifier << tok::l_brace;
5142
5143 DS.SetTypeSpecError();
5144 // Skip the rest of this declarator, up until the comma or semicolon.
5145 SkipUntil(T: tok::comma, Flags: StopAtSemi);
5146 return;
5147 }
5148
5149 // If an identifier is present, consume and remember it.
5150 IdentifierInfo *Name = nullptr;
5151 SourceLocation NameLoc;
5152 if (Tok.is(K: tok::identifier)) {
5153 Name = Tok.getIdentifierInfo();
5154 NameLoc = ConsumeToken();
5155 }
5156
5157 if (!Name && ScopedEnumKWLoc.isValid()) {
5158 // C++0x 7.2p2: The optional identifier shall not be omitted in the
5159 // declaration of a scoped enumeration.
5160 Diag(Tok, DiagID: diag::err_scoped_enum_missing_identifier);
5161 ScopedEnumKWLoc = SourceLocation();
5162 IsScopedUsingClassTag = false;
5163 }
5164
5165 // Okay, end the suppression area. We'll decide whether to emit the
5166 // diagnostics in a second.
5167 if (shouldDelayDiagsInTag)
5168 diagsFromTag.done();
5169
5170 TypeResult BaseType;
5171 SourceRange BaseRange;
5172
5173 bool CanBeBitfield =
5174 getCurScope()->isClassScope() && ScopedEnumKWLoc.isInvalid() && Name;
5175
5176 // Parse the fixed underlying type.
5177 if (Tok.is(K: tok::colon)) {
5178 // This might be an enum-base or part of some unrelated enclosing context.
5179 //
5180 // 'enum E : base' is permitted in two circumstances:
5181 //
5182 // 1) As a defining-type-specifier, when followed by '{'.
5183 // 2) As the sole constituent of a complete declaration -- when DS is empty
5184 // and the next token is ';'.
5185 //
5186 // The restriction to defining-type-specifiers is important to allow parsing
5187 // a ? new enum E : int{}
5188 // _Generic(a, enum E : int{})
5189 // properly.
5190 //
5191 // One additional consideration applies:
5192 //
5193 // C++ [dcl.enum]p1:
5194 // A ':' following "enum nested-name-specifier[opt] identifier" within
5195 // the decl-specifier-seq of a member-declaration is parsed as part of
5196 // an enum-base.
5197 //
5198 // Other language modes supporting enumerations with fixed underlying types
5199 // do not have clear rules on this, so we disambiguate to determine whether
5200 // the tokens form a bit-field width or an enum-base.
5201
5202 if (CanBeBitfield && !isEnumBase(AllowSemi: CanBeOpaqueEnumDeclaration)) {
5203 // Outside C++11, do not interpret the tokens as an enum-base if they do
5204 // not make sense as one. In C++11, it's an error if this happens.
5205 if (getLangOpts().CPlusPlus11)
5206 Diag(Loc: Tok.getLocation(), DiagID: diag::err_anonymous_enum_bitfield);
5207 } else if (CanHaveEnumBase || !ColonIsSacred) {
5208 SourceLocation ColonLoc = ConsumeToken();
5209
5210 // Parse a type-specifier-seq as a type. We can't just ParseTypeName here,
5211 // because under -fms-extensions,
5212 // enum E : int *p;
5213 // declares 'enum E : int; E *p;' not 'enum E : int*; E p;'.
5214 DeclSpec DS(AttrFactory);
5215 // enum-base is not assumed to be a type and therefore requires the
5216 // typename keyword [p0634r3].
5217 ParseSpecifierQualifierList(DS, AllowImplicitTypename: ImplicitTypenameContext::No, AS,
5218 DSC: DeclSpecContext::DSC_type_specifier);
5219 Declarator DeclaratorInfo(DS, ParsedAttributesView::none(),
5220 DeclaratorContext::TypeName);
5221 BaseType = Actions.ActOnTypeName(D&: DeclaratorInfo);
5222
5223 BaseRange = SourceRange(ColonLoc, DeclaratorInfo.getSourceRange().getEnd());
5224
5225 if (!getLangOpts().ObjC) {
5226 if (getLangOpts().CPlusPlus)
5227 DiagCompat(Loc: ColonLoc, CompatDiagId: diag_compat::enum_fixed_underlying_type)
5228 << BaseRange;
5229 else if (getLangOpts().MicrosoftExt && !getLangOpts().C23)
5230 Diag(Loc: ColonLoc, DiagID: diag::ext_ms_c_enum_fixed_underlying_type)
5231 << BaseRange;
5232 else
5233 Diag(Loc: ColonLoc, DiagID: getLangOpts().C23
5234 ? diag::warn_c17_compat_enum_fixed_underlying_type
5235 : diag::ext_c23_enum_fixed_underlying_type)
5236 << BaseRange;
5237 }
5238 }
5239 }
5240
5241 // There are four options here. If we have 'friend enum foo;' then this is a
5242 // friend declaration, and cannot have an accompanying definition. If we have
5243 // 'enum foo;', then this is a forward declaration. If we have
5244 // 'enum foo {...' then this is a definition. Otherwise we have something
5245 // like 'enum foo xyz', a reference.
5246 //
5247 // This is needed to handle stuff like this right (C99 6.7.2.3p11):
5248 // enum foo {..}; void bar() { enum foo; } <- new foo in bar.
5249 // enum foo {..}; void bar() { enum foo x; } <- use of old foo.
5250 //
5251 TagUseKind TUK;
5252 if (AllowEnumSpecifier == AllowDefiningTypeSpec::No)
5253 TUK = TagUseKind::Reference;
5254 else if (Tok.is(K: tok::l_brace)) {
5255 if (DS.isFriendSpecified()) {
5256 Diag(Loc: Tok.getLocation(), DiagID: diag::err_friend_decl_defines_type)
5257 << SourceRange(DS.getFriendSpecLoc());
5258 ConsumeBrace();
5259 SkipUntil(T: tok::r_brace, Flags: StopAtSemi);
5260 // Discard any other definition-only pieces.
5261 attrs.clear();
5262 ScopedEnumKWLoc = SourceLocation();
5263 IsScopedUsingClassTag = false;
5264 BaseType = TypeResult();
5265 TUK = TagUseKind::Friend;
5266 } else {
5267 TUK = TagUseKind::Definition;
5268 }
5269 } else if (!isTypeSpecifier(DSC) &&
5270 (Tok.is(K: tok::semi) ||
5271 (Tok.isAtStartOfLine() &&
5272 !isValidAfterTypeSpecifier(CouldBeBitfield: CanBeBitfield)))) {
5273 // An opaque-enum-declaration is required to be standalone (no preceding or
5274 // following tokens in the declaration). Sema enforces this separately by
5275 // diagnosing anything else in the DeclSpec.
5276 TUK = DS.isFriendSpecified() ? TagUseKind::Friend : TagUseKind::Declaration;
5277 if (Tok.isNot(K: tok::semi)) {
5278 // A semicolon was missing after this declaration. Diagnose and recover.
5279 ExpectAndConsume(ExpectedTok: tok::semi, Diag: diag::err_expected_after, DiagMsg: "enum");
5280 PP.EnterToken(Tok, /*IsReinject=*/true);
5281 Tok.setKind(tok::semi);
5282 }
5283 } else {
5284 TUK = TagUseKind::Reference;
5285 }
5286
5287 bool IsElaboratedTypeSpecifier =
5288 TUK == TagUseKind::Reference || TUK == TagUseKind::Friend;
5289
5290 // If this is an elaborated type specifier nested in a larger declaration,
5291 // and we delayed diagnostics before, just merge them into the current pool.
5292 if (TUK == TagUseKind::Reference && shouldDelayDiagsInTag) {
5293 diagsFromTag.redelay();
5294 }
5295
5296 MultiTemplateParamsArg TParams;
5297 if (TemplateInfo.Kind != ParsedTemplateKind::NonTemplate &&
5298 TUK != TagUseKind::Reference) {
5299 if (!getLangOpts().CPlusPlus11 || !SS.isSet()) {
5300 // Skip the rest of this declarator, up until the comma or semicolon.
5301 Diag(Tok, DiagID: diag::err_enum_template);
5302 SkipUntil(T: tok::comma, Flags: StopAtSemi);
5303 return;
5304 }
5305
5306 if (TemplateInfo.Kind == ParsedTemplateKind::ExplicitInstantiation) {
5307 // Enumerations can't be explicitly instantiated.
5308 DS.SetTypeSpecError();
5309 Diag(Loc: StartLoc, DiagID: diag::err_explicit_instantiation_enum);
5310 return;
5311 }
5312
5313 assert(TemplateInfo.TemplateParams && "no template parameters");
5314 TParams = MultiTemplateParamsArg(TemplateInfo.TemplateParams->data(),
5315 TemplateInfo.TemplateParams->size());
5316 SS.setTemplateParamLists(TParams);
5317 }
5318
5319 if (!Name && TUK != TagUseKind::Definition) {
5320 Diag(Tok, DiagID: diag::err_enumerator_unnamed_no_def);
5321
5322 DS.SetTypeSpecError();
5323 // Skip the rest of this declarator, up until the comma or semicolon.
5324 SkipUntil(T: tok::comma, Flags: StopAtSemi);
5325 return;
5326 }
5327
5328 // An elaborated-type-specifier has a much more constrained grammar:
5329 //
5330 // 'enum' nested-name-specifier[opt] identifier
5331 //
5332 // If we parsed any other bits, reject them now.
5333 //
5334 // MSVC and (for now at least) Objective-C permit a full enum-specifier
5335 // or opaque-enum-declaration anywhere.
5336 if (IsElaboratedTypeSpecifier && !getLangOpts().MicrosoftExt &&
5337 !getLangOpts().ObjC) {
5338 ProhibitCXX11Attributes(Attrs&: attrs, AttrDiagID: diag::err_attributes_not_allowed,
5339 KeywordDiagID: diag::err_keyword_not_allowed,
5340 /*DiagnoseEmptyAttrs=*/true);
5341 if (BaseType.isUsable())
5342 Diag(Loc: BaseRange.getBegin(), DiagID: diag::ext_enum_base_in_type_specifier)
5343 << (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes) << BaseRange;
5344 else if (ScopedEnumKWLoc.isValid())
5345 Diag(Loc: ScopedEnumKWLoc, DiagID: diag::ext_elaborated_enum_class)
5346 << FixItHint::CreateRemoval(RemoveRange: ScopedEnumKWLoc) << IsScopedUsingClassTag;
5347 }
5348
5349 stripTypeAttributesOffDeclSpec(Attrs&: attrs, DS, TUK);
5350
5351 SkipBodyInfo SkipBody;
5352 if (!Name && TUK == TagUseKind::Definition && Tok.is(K: tok::l_brace) &&
5353 NextToken().is(K: tok::identifier))
5354 SkipBody = Actions.shouldSkipAnonEnumBody(S: getCurScope(),
5355 II: NextToken().getIdentifierInfo(),
5356 IILoc: NextToken().getLocation());
5357
5358 bool Owned = false;
5359 bool IsDependent = false;
5360 const char *PrevSpec = nullptr;
5361 unsigned DiagID;
5362 Decl *TagDecl =
5363 Actions.ActOnTag(S: getCurScope(), TagSpec: DeclSpec::TST_enum, TUK, KWLoc: StartLoc, SS,
5364 Name, NameLoc, Attr: attrs, AS, ModulePrivateLoc: DS.getModulePrivateSpecLoc(),
5365 TemplateParameterLists: TParams, OwnedDecl&: Owned, IsDependent, ScopedEnumKWLoc,
5366 ScopedEnumUsesClassTag: IsScopedUsingClassTag,
5367 UnderlyingType: BaseType, IsTypeSpecifier: DSC == DeclSpecContext::DSC_type_specifier,
5368 IsTemplateParamOrArg: DSC == DeclSpecContext::DSC_template_param ||
5369 DSC == DeclSpecContext::DSC_template_type_arg,
5370 OOK: OffsetOfState, SkipBody: &SkipBody).get();
5371
5372 if (SkipBody.ShouldSkip) {
5373 assert(TUK == TagUseKind::Definition && "can only skip a definition");
5374
5375 BalancedDelimiterTracker T(*this, tok::l_brace);
5376 T.consumeOpen();
5377 T.skipToEnd();
5378
5379 if (DS.SetTypeSpecType(T: DeclSpec::TST_enum, TagKwLoc: StartLoc,
5380 TagNameLoc: NameLoc.isValid() ? NameLoc : StartLoc,
5381 PrevSpec, DiagID, Rep: TagDecl, Owned,
5382 Policy: Actions.getASTContext().getPrintingPolicy()))
5383 Diag(Loc: StartLoc, DiagID) << PrevSpec;
5384 return;
5385 }
5386
5387 if (IsDependent) {
5388 // This enum has a dependent nested-name-specifier. Handle it as a
5389 // dependent tag.
5390 if (!Name) {
5391 DS.SetTypeSpecError();
5392 Diag(Tok, DiagID: diag::err_expected_type_name_after_typename);
5393 return;
5394 }
5395
5396 TypeResult Type = Actions.ActOnDependentTag(
5397 S: getCurScope(), TagSpec: DeclSpec::TST_enum, TUK, SS, Name, TagLoc: StartLoc, NameLoc);
5398 if (Type.isInvalid()) {
5399 DS.SetTypeSpecError();
5400 return;
5401 }
5402
5403 if (DS.SetTypeSpecType(T: DeclSpec::TST_typename, TagKwLoc: StartLoc,
5404 TagNameLoc: NameLoc.isValid() ? NameLoc : StartLoc,
5405 PrevSpec, DiagID, Rep: Type.get(),
5406 Policy: Actions.getASTContext().getPrintingPolicy()))
5407 Diag(Loc: StartLoc, DiagID) << PrevSpec;
5408
5409 return;
5410 }
5411
5412 if (!TagDecl) {
5413 // The action failed to produce an enumeration tag. If this is a
5414 // definition, consume the entire definition.
5415 if (Tok.is(K: tok::l_brace) && TUK != TagUseKind::Reference) {
5416 ConsumeBrace();
5417 SkipUntil(T: tok::r_brace, Flags: StopAtSemi);
5418 }
5419
5420 DS.SetTypeSpecError();
5421 return;
5422 }
5423
5424 if (Tok.is(K: tok::l_brace) && TUK == TagUseKind::Definition) {
5425 Decl *D = SkipBody.CheckSameAsPrevious ? SkipBody.New : TagDecl;
5426 ParseEnumBody(StartLoc, TagDecl: D, SkipBody: &SkipBody);
5427 if (SkipBody.CheckSameAsPrevious &&
5428 !Actions.ActOnDuplicateDefinition(S: getCurScope(), Prev: TagDecl, SkipBody)) {
5429 DS.SetTypeSpecError();
5430 return;
5431 }
5432 }
5433
5434 if (DS.SetTypeSpecType(T: DeclSpec::TST_enum, TagKwLoc: StartLoc,
5435 TagNameLoc: NameLoc.isValid() ? NameLoc : StartLoc,
5436 PrevSpec, DiagID, Rep: TagDecl, Owned,
5437 Policy: Actions.getASTContext().getPrintingPolicy()))
5438 Diag(Loc: StartLoc, DiagID) << PrevSpec;
5439}
5440
5441void Parser::ParseEnumBody(SourceLocation StartLoc, Decl *EnumDecl,
5442 SkipBodyInfo *SkipBody) {
5443 // Enter the scope of the enum body and start the definition.
5444 ParseScope EnumScope(this, Scope::DeclScope | Scope::EnumScope);
5445 Actions.ActOnTagStartDefinition(S: getCurScope(), TagDecl: EnumDecl);
5446
5447 BalancedDelimiterTracker T(*this, tok::l_brace);
5448 T.consumeOpen();
5449
5450 // C does not allow an empty enumerator-list, C++ does [dcl.enum].
5451 if (Tok.is(K: tok::r_brace) && !getLangOpts().CPlusPlus) {
5452 if (getLangOpts().MicrosoftExt)
5453 Diag(Loc: T.getOpenLocation(), DiagID: diag::ext_ms_c_empty_enum_type)
5454 << SourceRange(T.getOpenLocation(), Tok.getLocation());
5455 else
5456 Diag(Tok, DiagID: diag::err_empty_enum);
5457 }
5458
5459 SmallVector<Decl *, 32> EnumConstantDecls;
5460 SmallVector<SuppressAccessChecks, 32> EnumAvailabilityDiags;
5461
5462 Decl *LastEnumConstDecl = nullptr;
5463
5464 // Parse the enumerator-list.
5465 while (Tok.isNot(K: tok::r_brace)) {
5466 // Parse enumerator. If failed, try skipping till the start of the next
5467 // enumerator definition.
5468 if (Tok.isNot(K: tok::identifier)) {
5469 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected) << tok::identifier;
5470 if (SkipUntil(T1: tok::comma, T2: tok::r_brace, Flags: StopBeforeMatch) &&
5471 TryConsumeToken(Expected: tok::comma))
5472 continue;
5473 break;
5474 }
5475 IdentifierInfo *Ident = Tok.getIdentifierInfo();
5476 SourceLocation IdentLoc = ConsumeToken();
5477
5478 // If attributes exist after the enumerator, parse them.
5479 ParsedAttributes attrs(AttrFactory);
5480 MaybeParseGNUAttributes(Attrs&: attrs);
5481 if (isAllowedCXX11AttributeSpecifier()) {
5482 if (getLangOpts().CPlusPlus)
5483 Diag(Loc: Tok.getLocation(), DiagID: getLangOpts().CPlusPlus17
5484 ? diag::warn_cxx14_compat_ns_enum_attribute
5485 : diag::ext_ns_enum_attribute)
5486 << 1 /*enumerator*/;
5487 ParseCXX11Attributes(attrs);
5488 }
5489
5490 SourceLocation EqualLoc;
5491 ExprResult AssignedVal;
5492 EnumAvailabilityDiags.emplace_back(Args&: *this);
5493
5494 EnterExpressionEvaluationContext ConstantEvaluated(
5495 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
5496 if (TryConsumeToken(Expected: tok::equal, Loc&: EqualLoc)) {
5497 AssignedVal = ParseConstantExpressionInExprEvalContext();
5498 if (AssignedVal.isInvalid())
5499 SkipUntil(T1: tok::comma, T2: tok::r_brace, Flags: StopBeforeMatch);
5500 }
5501
5502 // Install the enumerator constant into EnumDecl.
5503 Decl *EnumConstDecl = Actions.ActOnEnumConstant(
5504 S: getCurScope(), EnumDecl, LastEnumConstant: LastEnumConstDecl, IdLoc: IdentLoc, Id: Ident, Attrs: attrs,
5505 EqualLoc, Val: AssignedVal.get(), SkipBody);
5506 EnumAvailabilityDiags.back().done();
5507
5508 EnumConstantDecls.push_back(Elt: EnumConstDecl);
5509 LastEnumConstDecl = EnumConstDecl;
5510
5511 if (Tok.is(K: tok::identifier)) {
5512 // We're missing a comma between enumerators.
5513 SourceLocation Loc = getEndOfPreviousToken();
5514 Diag(Loc, DiagID: diag::err_enumerator_list_missing_comma)
5515 << FixItHint::CreateInsertion(InsertionLoc: Loc, Code: ", ");
5516 continue;
5517 }
5518
5519 // Emumerator definition must be finished, only comma or r_brace are
5520 // allowed here.
5521 SourceLocation CommaLoc;
5522 if (Tok.isNot(K: tok::r_brace) && !TryConsumeToken(Expected: tok::comma, Loc&: CommaLoc)) {
5523 if (EqualLoc.isValid())
5524 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_either) << tok::r_brace
5525 << tok::comma;
5526 else
5527 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_end_of_enumerator);
5528 if (SkipUntil(T1: tok::comma, T2: tok::r_brace, Flags: StopBeforeMatch)) {
5529 if (TryConsumeToken(Expected: tok::comma, Loc&: CommaLoc))
5530 continue;
5531 } else {
5532 break;
5533 }
5534 }
5535
5536 // If comma is followed by r_brace, emit appropriate warning.
5537 if (Tok.is(K: tok::r_brace) && CommaLoc.isValid()) {
5538 if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11)
5539 Diag(Loc: CommaLoc, DiagID: getLangOpts().CPlusPlus ?
5540 diag::ext_enumerator_list_comma_cxx :
5541 diag::ext_enumerator_list_comma_c)
5542 << FixItHint::CreateRemoval(RemoveRange: CommaLoc);
5543 else if (getLangOpts().CPlusPlus11)
5544 Diag(Loc: CommaLoc, DiagID: diag::warn_cxx98_compat_enumerator_list_comma)
5545 << FixItHint::CreateRemoval(RemoveRange: CommaLoc);
5546 break;
5547 }
5548 }
5549
5550 // Eat the }.
5551 T.consumeClose();
5552
5553 // If attributes exist after the identifier list, parse them.
5554 ParsedAttributes attrs(AttrFactory);
5555 MaybeParseGNUAttributes(Attrs&: attrs);
5556
5557 Actions.ActOnEnumBody(EnumLoc: StartLoc, BraceRange: T.getRange(), EnumDecl, Elements: EnumConstantDecls,
5558 S: getCurScope(), Attr: attrs);
5559
5560 // Now handle enum constant availability diagnostics.
5561 assert(EnumConstantDecls.size() == EnumAvailabilityDiags.size());
5562 for (size_t i = 0, e = EnumConstantDecls.size(); i != e; ++i) {
5563 ParsingDeclRAIIObject PD(*this, ParsingDeclRAIIObject::NoParent);
5564 EnumAvailabilityDiags[i].redelay();
5565 PD.complete(D: EnumConstantDecls[i]);
5566 }
5567
5568 EnumScope.Exit();
5569 Actions.ActOnTagFinishDefinition(S: getCurScope(), TagDecl: EnumDecl, BraceRange: T.getRange());
5570
5571 // The next token must be valid after an enum definition. If not, a ';'
5572 // was probably forgotten.
5573 bool CanBeBitfield = getCurScope()->isClassScope();
5574 if (!isValidAfterTypeSpecifier(CouldBeBitfield: CanBeBitfield)) {
5575 ExpectAndConsume(ExpectedTok: tok::semi, Diag: diag::err_expected_after, DiagMsg: "enum");
5576 // Push this token back into the preprocessor and change our current token
5577 // to ';' so that the rest of the code recovers as though there were an
5578 // ';' after the definition.
5579 PP.EnterToken(Tok, /*IsReinject=*/true);
5580 Tok.setKind(tok::semi);
5581 }
5582}
5583
5584bool Parser::isKnownToBeTypeSpecifier(const Token &Tok) const {
5585 switch (Tok.getKind()) {
5586 default: return false;
5587 // type-specifiers
5588 case tok::kw_short:
5589 case tok::kw_long:
5590 case tok::kw___int64:
5591 case tok::kw___int128:
5592 case tok::kw_signed:
5593 case tok::kw_unsigned:
5594 case tok::kw__Complex:
5595 case tok::kw__Imaginary:
5596 case tok::kw_void:
5597 case tok::kw_char:
5598 case tok::kw_wchar_t:
5599 case tok::kw_char8_t:
5600 case tok::kw_char16_t:
5601 case tok::kw_char32_t:
5602 case tok::kw_int:
5603 case tok::kw__ExtInt:
5604 case tok::kw__BitInt:
5605 case tok::kw___bf16:
5606 case tok::kw_half:
5607 case tok::kw_float:
5608 case tok::kw_double:
5609 case tok::kw__Accum:
5610 case tok::kw__Fract:
5611 case tok::kw__Float16:
5612 case tok::kw___float128:
5613 case tok::kw___ibm128:
5614 case tok::kw_bool:
5615 case tok::kw__Bool:
5616 case tok::kw__Decimal32:
5617 case tok::kw__Decimal64:
5618 case tok::kw__Decimal128:
5619 case tok::kw___vector:
5620#define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
5621#include "clang/Basic/OpenCLImageTypes.def"
5622#define HLSL_INTANGIBLE_TYPE(Name, Id, SingletonId) case tok::kw_##Name:
5623#include "clang/Basic/HLSLIntangibleTypes.def"
5624
5625 // struct-or-union-specifier (C99) or class-specifier (C++)
5626 case tok::kw_class:
5627 case tok::kw_struct:
5628 case tok::kw___interface:
5629 case tok::kw_union:
5630 // enum-specifier
5631 case tok::kw_enum:
5632
5633 case tok::kw_typeof:
5634 case tok::kw_typeof_unqual:
5635
5636 // C11 _Atomic
5637 case tok::kw__Atomic:
5638
5639 // typedef-name
5640 case tok::annot_typename:
5641 return true;
5642 }
5643}
5644
5645bool Parser::isTypeSpecifierQualifier(const Token &Tok) {
5646 switch (Tok.getKind()) {
5647 default: return false;
5648
5649 case tok::identifier: // foo::bar
5650 if (TryAltiVecVectorToken())
5651 return true;
5652 [[fallthrough]];
5653 case tok::kw_typename: // typename T::type
5654 // Annotate typenames and C++ scope specifiers. If we get one, just
5655 // recurse to handle whatever we get.
5656 if (TryAnnotateTypeOrScopeToken())
5657 return true;
5658 if (getCurToken().is(K: tok::identifier))
5659 return false;
5660 return isTypeSpecifierQualifier(Tok: getCurToken());
5661
5662 case tok::coloncolon: // ::foo::bar
5663 if (NextToken().is(K: tok::kw_new) || // ::new
5664 NextToken().is(K: tok::kw_delete)) // ::delete
5665 return false;
5666
5667 if (TryAnnotateTypeOrScopeToken())
5668 return true;
5669 return isTypeSpecifierQualifier(Tok: getCurToken());
5670
5671 // GNU attributes support.
5672 case tok::kw___attribute:
5673 // C23/GNU typeof support.
5674 case tok::kw_typeof:
5675 case tok::kw_typeof_unqual:
5676
5677 // type-specifiers
5678 case tok::kw_short:
5679 case tok::kw_long:
5680 case tok::kw___int64:
5681 case tok::kw___int128:
5682 case tok::kw_signed:
5683 case tok::kw_unsigned:
5684 case tok::kw__Complex:
5685 case tok::kw__Imaginary:
5686 case tok::kw_void:
5687 case tok::kw_char:
5688 case tok::kw_wchar_t:
5689 case tok::kw_char8_t:
5690 case tok::kw_char16_t:
5691 case tok::kw_char32_t:
5692 case tok::kw_int:
5693 case tok::kw__ExtInt:
5694 case tok::kw__BitInt:
5695 case tok::kw_half:
5696 case tok::kw___bf16:
5697 case tok::kw_float:
5698 case tok::kw_double:
5699 case tok::kw__Accum:
5700 case tok::kw__Fract:
5701 case tok::kw__Float16:
5702 case tok::kw___float128:
5703 case tok::kw___ibm128:
5704 case tok::kw_bool:
5705 case tok::kw__Bool:
5706 case tok::kw__Decimal32:
5707 case tok::kw__Decimal64:
5708 case tok::kw__Decimal128:
5709 case tok::kw___vector:
5710#define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
5711#include "clang/Basic/OpenCLImageTypes.def"
5712#define HLSL_INTANGIBLE_TYPE(Name, Id, SingletonId) case tok::kw_##Name:
5713#include "clang/Basic/HLSLIntangibleTypes.def"
5714
5715 // struct-or-union-specifier (C99) or class-specifier (C++)
5716 case tok::kw_class:
5717 case tok::kw_struct:
5718 case tok::kw___interface:
5719 case tok::kw_union:
5720 // enum-specifier
5721 case tok::kw_enum:
5722
5723 // type-qualifier
5724 case tok::kw_const:
5725 case tok::kw_volatile:
5726 case tok::kw_restrict:
5727 case tok::kw___ob_wrap:
5728 case tok::kw___ob_trap:
5729 case tok::kw__Sat:
5730
5731 // Debugger support.
5732 case tok::kw___unknown_anytype:
5733
5734 // typedef-name
5735 case tok::annot_typename:
5736 return true;
5737
5738 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
5739 case tok::less:
5740 return getLangOpts().ObjC;
5741
5742 case tok::kw___cdecl:
5743 case tok::kw___stdcall:
5744 case tok::kw___fastcall:
5745 case tok::kw___thiscall:
5746 case tok::kw___regcall:
5747 case tok::kw___vectorcall:
5748 case tok::kw___w64:
5749 case tok::kw___ptr64:
5750 case tok::kw___ptr32:
5751 case tok::kw___pascal:
5752 case tok::kw___unaligned:
5753 case tok::kw___ptrauth:
5754
5755 case tok::kw__Nonnull:
5756 case tok::kw__Nullable:
5757 case tok::kw__Nullable_result:
5758 case tok::kw__Null_unspecified:
5759
5760 case tok::kw___kindof:
5761
5762 case tok::kw___private:
5763 case tok::kw___local:
5764 case tok::kw___global:
5765 case tok::kw___constant:
5766 case tok::kw___generic:
5767 case tok::kw___read_only:
5768 case tok::kw___read_write:
5769 case tok::kw___write_only:
5770 case tok::kw___funcref:
5771 return true;
5772
5773 case tok::kw_private:
5774 return getLangOpts().OpenCL;
5775
5776 // C11 _Atomic
5777 case tok::kw__Atomic:
5778 return true;
5779
5780 // HLSL type qualifiers
5781 case tok::kw_groupshared:
5782 case tok::kw_in:
5783 case tok::kw_inout:
5784 case tok::kw_out:
5785 case tok::kw_row_major:
5786 case tok::kw_column_major:
5787 return getLangOpts().HLSL;
5788 }
5789}
5790
5791Parser::DeclGroupPtrTy Parser::ParseTopLevelStmtDecl() {
5792 assert(PP.isIncrementalProcessingEnabled() && "Not in incremental mode");
5793
5794 // Parse a top-level-stmt.
5795 Parser::StmtVector Stmts;
5796 ParsedStmtContext SubStmtCtx = ParsedStmtContext();
5797 ParseScope FnScope(this, Scope::FnScope | Scope::DeclScope |
5798 Scope::CompoundStmtScope);
5799 TopLevelStmtDecl *TLSD = Actions.ActOnStartTopLevelStmtDecl(S: getCurScope());
5800 StmtResult R = ParseStatementOrDeclaration(Stmts, StmtCtx: SubStmtCtx);
5801 Actions.ActOnFinishTopLevelStmtDecl(D: TLSD, Statement: R.get());
5802 if (!R.isUsable())
5803 R = Actions.ActOnNullStmt(SemiLoc: Tok.getLocation());
5804
5805 if (Tok.is(K: tok::annot_repl_input_end) &&
5806 Tok.getAnnotationValue() != nullptr) {
5807 ConsumeAnnotationToken();
5808 TLSD->setSemiMissing();
5809 }
5810
5811 SmallVector<Decl *, 2> DeclsInGroup;
5812 DeclsInGroup.push_back(Elt: TLSD);
5813
5814 // Currently happens for things like -fms-extensions and use `__if_exists`.
5815 for (Stmt *S : Stmts) {
5816 // Here we should be safe as `__if_exists` and friends are not introducing
5817 // new variables which need to live outside file scope.
5818 TopLevelStmtDecl *D = Actions.ActOnStartTopLevelStmtDecl(S: getCurScope());
5819 Actions.ActOnFinishTopLevelStmtDecl(D, Statement: S);
5820 DeclsInGroup.push_back(Elt: D);
5821 }
5822
5823 return Actions.BuildDeclaratorGroup(Group: DeclsInGroup);
5824}
5825
5826bool Parser::isDeclarationSpecifier(
5827 ImplicitTypenameContext AllowImplicitTypename,
5828 bool DisambiguatingWithExpression) {
5829 switch (Tok.getKind()) {
5830 default: return false;
5831
5832 // OpenCL 2.0 and later define this keyword.
5833 case tok::kw_pipe:
5834 return getLangOpts().OpenCL &&
5835 getLangOpts().getOpenCLCompatibleVersion() >= 200;
5836
5837 case tok::identifier: // foo::bar
5838 // Unfortunate hack to support "Class.factoryMethod" notation.
5839 if (getLangOpts().ObjC && NextToken().is(K: tok::period))
5840 return false;
5841 if (TryAltiVecVectorToken())
5842 return true;
5843 [[fallthrough]];
5844 case tok::kw_decltype: // decltype(T())::type
5845 case tok::kw_typename: // typename T::type
5846 // Annotate typenames and C++ scope specifiers. If we get one, just
5847 // recurse to handle whatever we get.
5848 if (TryAnnotateTypeOrScopeToken(AllowImplicitTypename))
5849 return true;
5850 if (TryAnnotateTypeConstraint())
5851 return true;
5852 if (Tok.is(K: tok::identifier))
5853 return false;
5854
5855 // If we're in Objective-C and we have an Objective-C class type followed
5856 // by an identifier and then either ':' or ']', in a place where an
5857 // expression is permitted, then this is probably a class message send
5858 // missing the initial '['. In this case, we won't consider this to be
5859 // the start of a declaration.
5860 if (DisambiguatingWithExpression &&
5861 isStartOfObjCClassMessageMissingOpenBracket())
5862 return false;
5863
5864 return isDeclarationSpecifier(AllowImplicitTypename);
5865
5866 case tok::coloncolon: // ::foo::bar
5867 if (!getLangOpts().CPlusPlus)
5868 return false;
5869 if (NextToken().is(K: tok::kw_new) || // ::new
5870 NextToken().is(K: tok::kw_delete)) // ::delete
5871 return false;
5872
5873 // Annotate typenames and C++ scope specifiers. If we get one, just
5874 // recurse to handle whatever we get.
5875 if (TryAnnotateTypeOrScopeToken())
5876 return true;
5877 return isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No);
5878
5879 // storage-class-specifier
5880 case tok::kw_typedef:
5881 case tok::kw_extern:
5882 case tok::kw___private_extern__:
5883 case tok::kw_static:
5884 case tok::kw_auto:
5885 case tok::kw___auto_type:
5886 case tok::kw_register:
5887 case tok::kw___thread:
5888 case tok::kw_thread_local:
5889 case tok::kw__Thread_local:
5890
5891 // Modules
5892 case tok::kw___module_private__:
5893
5894 // Debugger support
5895 case tok::kw___unknown_anytype:
5896
5897 // type-specifiers
5898 case tok::kw_short:
5899 case tok::kw_long:
5900 case tok::kw___int64:
5901 case tok::kw___int128:
5902 case tok::kw_signed:
5903 case tok::kw_unsigned:
5904 case tok::kw__Complex:
5905 case tok::kw__Imaginary:
5906 case tok::kw_void:
5907 case tok::kw_char:
5908 case tok::kw_wchar_t:
5909 case tok::kw_char8_t:
5910 case tok::kw_char16_t:
5911 case tok::kw_char32_t:
5912
5913 case tok::kw_int:
5914 case tok::kw__ExtInt:
5915 case tok::kw__BitInt:
5916 case tok::kw_half:
5917 case tok::kw___bf16:
5918 case tok::kw_float:
5919 case tok::kw_double:
5920 case tok::kw__Accum:
5921 case tok::kw__Fract:
5922 case tok::kw__Float16:
5923 case tok::kw___float128:
5924 case tok::kw___ibm128:
5925 case tok::kw_bool:
5926 case tok::kw__Bool:
5927 case tok::kw__Decimal32:
5928 case tok::kw__Decimal64:
5929 case tok::kw__Decimal128:
5930 case tok::kw___vector:
5931
5932 // struct-or-union-specifier (C99) or class-specifier (C++)
5933 case tok::kw_class:
5934 case tok::kw_struct:
5935 case tok::kw_union:
5936 case tok::kw___interface:
5937 // enum-specifier
5938 case tok::kw_enum:
5939
5940 // type-qualifier
5941 case tok::kw_const:
5942 case tok::kw_volatile:
5943 case tok::kw_restrict:
5944 case tok::kw___ob_wrap:
5945 case tok::kw___ob_trap:
5946 case tok::kw__Sat:
5947
5948 // function-specifier
5949 case tok::kw_inline:
5950 case tok::kw_virtual:
5951 case tok::kw_explicit:
5952 case tok::kw__Noreturn:
5953
5954 // alignment-specifier
5955 case tok::kw__Alignas:
5956
5957 // friend keyword.
5958 case tok::kw_friend:
5959
5960 // static_assert-declaration
5961 case tok::kw_static_assert:
5962 case tok::kw__Static_assert:
5963
5964 // C23/GNU typeof support.
5965 case tok::kw_typeof:
5966 case tok::kw_typeof_unqual:
5967
5968 // GNU attributes.
5969 case tok::kw___attribute:
5970
5971 // C++11 decltype and constexpr.
5972 case tok::annot_decltype:
5973 case tok::annot_pack_indexing_type:
5974 case tok::kw_constexpr:
5975
5976 // C++20 consteval and constinit.
5977 case tok::kw_consteval:
5978 case tok::kw_constinit:
5979
5980 // C11 _Atomic
5981 case tok::kw__Atomic:
5982 return true;
5983
5984 case tok::kw_alignas:
5985 // alignas is a type-specifier-qualifier in C23, which is a kind of
5986 // declaration-specifier. Outside of C23 mode (including in C++), it is not.
5987 return getLangOpts().C23;
5988
5989 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
5990 case tok::less:
5991 return getLangOpts().ObjC;
5992
5993 // typedef-name
5994 case tok::annot_typename:
5995 return !DisambiguatingWithExpression ||
5996 !isStartOfObjCClassMessageMissingOpenBracket();
5997
5998 // placeholder-type-specifier
5999 case tok::annot_template_id: {
6000 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
6001 if (TemplateId->hasInvalidName())
6002 return true;
6003 // FIXME: What about type templates that have only been annotated as
6004 // annot_template_id, not as annot_typename?
6005 return isTypeConstraintAnnotation() &&
6006 (NextToken().is(K: tok::kw_auto) || NextToken().is(K: tok::kw_decltype));
6007 }
6008
6009 case tok::annot_cxxscope: {
6010 TemplateIdAnnotation *TemplateId =
6011 NextToken().is(K: tok::annot_template_id)
6012 ? takeTemplateIdAnnotation(tok: NextToken())
6013 : nullptr;
6014 if (TemplateId && TemplateId->hasInvalidName())
6015 return true;
6016 // FIXME: What about type templates that have only been annotated as
6017 // annot_template_id, not as annot_typename?
6018 if (NextToken().is(K: tok::identifier) && TryAnnotateTypeConstraint())
6019 return true;
6020 return isTypeConstraintAnnotation() &&
6021 GetLookAheadToken(N: 2).isOneOf(Ks: tok::kw_auto, Ks: tok::kw_decltype);
6022 }
6023
6024 case tok::kw___declspec:
6025 case tok::kw___cdecl:
6026 case tok::kw___stdcall:
6027 case tok::kw___fastcall:
6028 case tok::kw___thiscall:
6029 case tok::kw___regcall:
6030 case tok::kw___vectorcall:
6031 case tok::kw___w64:
6032 case tok::kw___sptr:
6033 case tok::kw___uptr:
6034 case tok::kw___ptr64:
6035 case tok::kw___ptr32:
6036 case tok::kw___forceinline:
6037 case tok::kw___pascal:
6038 case tok::kw___unaligned:
6039 case tok::kw___ptrauth:
6040
6041 case tok::kw__Nonnull:
6042 case tok::kw__Nullable:
6043 case tok::kw__Nullable_result:
6044 case tok::kw__Null_unspecified:
6045
6046 case tok::kw___kindof:
6047
6048 case tok::kw___private:
6049 case tok::kw___local:
6050 case tok::kw___global:
6051 case tok::kw___constant:
6052 case tok::kw___generic:
6053 case tok::kw___read_only:
6054 case tok::kw___read_write:
6055 case tok::kw___write_only:
6056#define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
6057#include "clang/Basic/OpenCLImageTypes.def"
6058#define HLSL_INTANGIBLE_TYPE(Name, Id, SingletonId) case tok::kw_##Name:
6059#include "clang/Basic/HLSLIntangibleTypes.def"
6060
6061 case tok::kw___funcref:
6062 case tok::kw_groupshared:
6063 return true;
6064
6065 case tok::kw_row_major:
6066 case tok::kw_column_major:
6067 return getLangOpts().HLSL;
6068
6069 case tok::kw_private:
6070 return getLangOpts().OpenCL;
6071 }
6072}
6073
6074bool Parser::isConstructorDeclarator(bool IsUnqualified, bool DeductionGuide,
6075 DeclSpec::FriendSpecified IsFriend,
6076 const ParsedTemplateInfo *TemplateInfo) {
6077 RevertingTentativeParsingAction TPA(*this);
6078 // Parse the C++ scope specifier.
6079 CXXScopeSpec SS;
6080 if (TemplateInfo && TemplateInfo->TemplateParams)
6081 SS.setTemplateParamLists(*TemplateInfo->TemplateParams);
6082
6083 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
6084 /*ObjectHasErrors=*/false,
6085 /*EnteringContext=*/true)) {
6086 return false;
6087 }
6088
6089 // Parse the constructor name.
6090 if (Tok.is(K: tok::identifier)) {
6091 // We already know that we have a constructor name; just consume
6092 // the token.
6093 ConsumeToken();
6094 } else if (Tok.is(K: tok::annot_template_id)) {
6095 ConsumeAnnotationToken();
6096 } else {
6097 return false;
6098 }
6099
6100 // There may be attributes here, appertaining to the constructor name or type
6101 // we just stepped past.
6102 SkipCXX11Attributes();
6103
6104 // Current class name must be followed by a left parenthesis.
6105 if (Tok.isNot(K: tok::l_paren)) {
6106 return false;
6107 }
6108 ConsumeParen();
6109
6110 // A right parenthesis, or ellipsis followed by a right parenthesis signals
6111 // that we have a constructor.
6112 if (Tok.is(K: tok::r_paren) ||
6113 (Tok.is(K: tok::ellipsis) && NextToken().is(K: tok::r_paren))) {
6114 return true;
6115 }
6116
6117 // A C++11 attribute here signals that we have a constructor, and is an
6118 // attribute on the first constructor parameter.
6119 if (isCXX11AttributeSpecifier(/*Disambiguate=*/false,
6120 /*OuterMightBeMessageSend=*/true) !=
6121 CXX11AttributeKind::NotAttributeSpecifier) {
6122 return true;
6123 }
6124
6125 // If we need to, enter the specified scope.
6126 DeclaratorScopeObj DeclScopeObj(*this, SS);
6127 if (SS.isSet() && Actions.ShouldEnterDeclaratorScope(S: getCurScope(), SS))
6128 DeclScopeObj.EnterDeclaratorScope();
6129
6130 // Optionally skip Microsoft attributes.
6131 ParsedAttributes Attrs(AttrFactory);
6132 MaybeParseMicrosoftAttributes(Attrs);
6133
6134 // Check whether the next token(s) are part of a declaration
6135 // specifier, in which case we have the start of a parameter and,
6136 // therefore, we know that this is a constructor.
6137 // Due to an ambiguity with implicit typename, the above is not enough.
6138 // Additionally, check to see if we are a friend.
6139 // If we parsed a scope specifier as well as friend,
6140 // we might be parsing a friend constructor.
6141 bool IsConstructor = false;
6142 ImplicitTypenameContext ITC = IsFriend && !SS.isSet()
6143 ? ImplicitTypenameContext::No
6144 : ImplicitTypenameContext::Yes;
6145 // Constructors cannot have this parameters, but we support that scenario here
6146 // to improve diagnostic.
6147 if (Tok.is(K: tok::kw_this)) {
6148 ConsumeToken();
6149 return isDeclarationSpecifier(AllowImplicitTypename: ITC);
6150 }
6151
6152 if (isDeclarationSpecifier(AllowImplicitTypename: ITC))
6153 IsConstructor = true;
6154 else if (Tok.is(K: tok::identifier) ||
6155 (Tok.is(K: tok::annot_cxxscope) && NextToken().is(K: tok::identifier))) {
6156 // We've seen "C ( X" or "C ( X::Y", but "X" / "X::Y" is not a type.
6157 // This might be a parenthesized member name, but is more likely to
6158 // be a constructor declaration with an invalid argument type. Keep
6159 // looking.
6160 if (Tok.is(K: tok::annot_cxxscope))
6161 ConsumeAnnotationToken();
6162 ConsumeToken();
6163
6164 // If this is not a constructor, we must be parsing a declarator,
6165 // which must have one of the following syntactic forms (see the
6166 // grammar extract at the start of ParseDirectDeclarator):
6167 switch (Tok.getKind()) {
6168 case tok::l_paren:
6169 // C(X ( int));
6170 case tok::l_square:
6171 // C(X [ 5]);
6172 // C(X [ [attribute]]);
6173 case tok::coloncolon:
6174 // C(X :: Y);
6175 // C(X :: *p);
6176 // Assume this isn't a constructor, rather than assuming it's a
6177 // constructor with an unnamed parameter of an ill-formed type.
6178 break;
6179
6180 case tok::r_paren:
6181 // C(X )
6182
6183 // Skip past the right-paren and any following attributes to get to
6184 // the function body or trailing-return-type.
6185 ConsumeParen();
6186 SkipCXX11Attributes();
6187
6188 if (DeductionGuide) {
6189 // C(X) -> ... is a deduction guide.
6190 IsConstructor = Tok.is(K: tok::arrow);
6191 break;
6192 }
6193 if (Tok.is(K: tok::colon) || Tok.is(K: tok::kw_try)) {
6194 // Assume these were meant to be constructors:
6195 // C(X) : (the name of a bit-field cannot be parenthesized).
6196 // C(X) try (this is otherwise ill-formed).
6197 IsConstructor = true;
6198 }
6199 if (Tok.is(K: tok::semi) || Tok.is(K: tok::l_brace)) {
6200 // If we have a constructor name within the class definition,
6201 // assume these were meant to be constructors:
6202 // C(X) {
6203 // C(X) ;
6204 // ... because otherwise we would be declaring a non-static data
6205 // member that is ill-formed because it's of the same type as its
6206 // surrounding class.
6207 //
6208 // FIXME: We can actually do this whether or not the name is qualified,
6209 // because if it is qualified in this context it must be being used as
6210 // a constructor name.
6211 // currently, so we're somewhat conservative here.
6212 IsConstructor = IsUnqualified;
6213 }
6214 break;
6215
6216 default:
6217 IsConstructor = true;
6218 break;
6219 }
6220 }
6221 return IsConstructor;
6222}
6223
6224void Parser::ParseTypeQualifierListOpt(
6225 DeclSpec &DS, unsigned AttrReqs, bool AtomicOrPtrauthAllowed,
6226 bool IdentifierRequired, llvm::function_ref<void()> CodeCompletionHandler) {
6227 if ((AttrReqs & AR_CXX11AttributesParsed) &&
6228 isAllowedCXX11AttributeSpecifier()) {
6229 ParsedAttributes Attrs(AttrFactory);
6230 ParseCXX11Attributes(attrs&: Attrs);
6231 DS.takeAttributesAppendingingFrom(attrs&: Attrs);
6232 }
6233
6234 SourceLocation EndLoc;
6235
6236 while (true) {
6237 bool isInvalid = false;
6238 const char *PrevSpec = nullptr;
6239 unsigned DiagID = 0;
6240 SourceLocation Loc = Tok.getLocation();
6241
6242 switch (Tok.getKind()) {
6243 case tok::code_completion:
6244 cutOffParsing();
6245 if (CodeCompletionHandler)
6246 CodeCompletionHandler();
6247 else
6248 Actions.CodeCompletion().CodeCompleteTypeQualifiers(DS);
6249 return;
6250
6251 case tok::kw_const:
6252 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_const , Loc, PrevSpec, DiagID,
6253 Lang: getLangOpts());
6254 break;
6255 case tok::kw_volatile:
6256 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
6257 Lang: getLangOpts());
6258 break;
6259 case tok::kw_restrict:
6260 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
6261 Lang: getLangOpts());
6262 break;
6263 case tok::kw___ob_wrap:
6264 if (!getLangOpts().OverflowBehaviorTypes) {
6265 Diag(Loc, DiagID: diag::warn_overflow_behavior_keyword_disabled)
6266 << tok::getKeywordSpelling(Kind: Tok.getKind());
6267 break;
6268 }
6269 isInvalid = DS.SetOverflowBehavior(
6270 Kind: OverflowBehaviorType::OverflowBehaviorKind::Wrap, Loc, PrevSpec,
6271 DiagID);
6272 break;
6273 case tok::kw___ob_trap:
6274 if (!getLangOpts().OverflowBehaviorTypes) {
6275 Diag(Loc, DiagID: diag::warn_overflow_behavior_keyword_disabled)
6276 << tok::getKeywordSpelling(Kind: Tok.getKind());
6277 break;
6278 }
6279 isInvalid = DS.SetOverflowBehavior(
6280 Kind: OverflowBehaviorType::OverflowBehaviorKind::Trap, Loc, PrevSpec,
6281 DiagID);
6282 break;
6283 case tok::kw__Atomic:
6284 if (!AtomicOrPtrauthAllowed)
6285 goto DoneWithTypeQuals;
6286 diagnoseUseOfC11Keyword(Tok);
6287 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
6288 Lang: getLangOpts());
6289 break;
6290
6291 // OpenCL qualifiers:
6292 case tok::kw_private:
6293 if (!getLangOpts().OpenCL)
6294 goto DoneWithTypeQuals;
6295 [[fallthrough]];
6296 case tok::kw___private:
6297 case tok::kw___global:
6298 case tok::kw___local:
6299 case tok::kw___constant:
6300 case tok::kw___generic:
6301 case tok::kw___read_only:
6302 case tok::kw___write_only:
6303 case tok::kw___read_write:
6304 ParseOpenCLQualifiers(Attrs&: DS.getAttributes());
6305 break;
6306
6307 case tok::kw_groupshared:
6308 case tok::kw_in:
6309 case tok::kw_inout:
6310 case tok::kw_out:
6311 // NOTE: ParseHLSLQualifiers will consume the qualifier token.
6312 ParseHLSLQualifiers(Attrs&: DS.getAttributes());
6313 continue;
6314
6315 // __ptrauth qualifier.
6316 case tok::kw___ptrauth:
6317 if (!AtomicOrPtrauthAllowed)
6318 goto DoneWithTypeQuals;
6319 ParsePtrauthQualifier(Attrs&: DS.getAttributes());
6320 EndLoc = PrevTokLocation;
6321 continue;
6322
6323 case tok::kw___unaligned:
6324 isInvalid = DS.SetTypeQual(T: DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
6325 Lang: getLangOpts());
6326 break;
6327 case tok::kw___uptr:
6328 // GNU libc headers in C mode use '__uptr' as an identifier which conflicts
6329 // with the MS modifier keyword.
6330 if ((AttrReqs & AR_DeclspecAttributesParsed) && !getLangOpts().CPlusPlus &&
6331 IdentifierRequired && DS.isEmpty() && NextToken().is(K: tok::semi)) {
6332 if (TryKeywordIdentFallback(DisableKeyword: false))
6333 continue;
6334 }
6335 [[fallthrough]];
6336 case tok::kw___sptr:
6337 case tok::kw___w64:
6338 case tok::kw___ptr64:
6339 case tok::kw___ptr32:
6340 case tok::kw___cdecl:
6341 case tok::kw___stdcall:
6342 case tok::kw___fastcall:
6343 case tok::kw___thiscall:
6344 case tok::kw___regcall:
6345 case tok::kw___vectorcall:
6346 if (AttrReqs & AR_DeclspecAttributesParsed) {
6347 ParseMicrosoftTypeAttributes(attrs&: DS.getAttributes());
6348 continue;
6349 }
6350 goto DoneWithTypeQuals;
6351
6352 case tok::kw___funcref:
6353 ParseWebAssemblyFuncrefTypeAttribute(attrs&: DS.getAttributes());
6354 continue;
6355
6356 case tok::kw___pascal:
6357 if (AttrReqs & AR_VendorAttributesParsed) {
6358 ParseBorlandTypeAttributes(attrs&: DS.getAttributes());
6359 continue;
6360 }
6361 goto DoneWithTypeQuals;
6362
6363 // Nullability type specifiers.
6364 case tok::kw__Nonnull:
6365 case tok::kw__Nullable:
6366 case tok::kw__Nullable_result:
6367 case tok::kw__Null_unspecified:
6368 ParseNullabilityTypeSpecifiers(attrs&: DS.getAttributes());
6369 continue;
6370
6371 // Objective-C 'kindof' types.
6372 case tok::kw___kindof:
6373 DS.getAttributes().addNew(attrName: Tok.getIdentifierInfo(), attrRange: Loc,
6374 scope: AttributeScopeInfo(), args: nullptr, numArgs: 0,
6375 form: tok::kw___kindof);
6376 (void)ConsumeToken();
6377 continue;
6378
6379 case tok::kw___attribute:
6380 if (AttrReqs & AR_GNUAttributesParsedAndRejected)
6381 // When GNU attributes are expressly forbidden, diagnose their usage.
6382 Diag(Tok, DiagID: diag::err_attributes_not_allowed);
6383
6384 // Parse the attributes even if they are rejected to ensure that error
6385 // recovery is graceful.
6386 if (AttrReqs & AR_GNUAttributesParsed ||
6387 AttrReqs & AR_GNUAttributesParsedAndRejected) {
6388 ParseGNUAttributes(Attrs&: DS.getAttributes());
6389 continue; // do *not* consume the next token!
6390 }
6391 // otherwise, FALL THROUGH!
6392 [[fallthrough]];
6393 default:
6394 DoneWithTypeQuals:
6395 // If this is not a type-qualifier token, we're done reading type
6396 // qualifiers. First verify that DeclSpec's are consistent.
6397 DS.Finish(S&: Actions, Policy: Actions.getASTContext().getPrintingPolicy());
6398 if (EndLoc.isValid())
6399 DS.SetRangeEnd(EndLoc);
6400 return;
6401 }
6402
6403 // If the specifier combination wasn't legal, issue a diagnostic.
6404 if (isInvalid) {
6405 assert(PrevSpec && "Method did not return previous specifier!");
6406 Diag(Tok, DiagID) << PrevSpec;
6407 }
6408 EndLoc = ConsumeToken();
6409 }
6410}
6411
6412void Parser::ParseDeclarator(Declarator &D) {
6413 /// This implements the 'declarator' production in the C grammar, then checks
6414 /// for well-formedness and issues diagnostics.
6415 Actions.runWithSufficientStackSpace(Loc: D.getBeginLoc(), Fn: [&] {
6416 ParseDeclaratorInternal(D, DirectDeclParser: &Parser::ParseDirectDeclarator);
6417 });
6418}
6419
6420static bool isPtrOperatorToken(tok::TokenKind Kind, const LangOptions &Lang,
6421 DeclaratorContext TheContext) {
6422 if (Kind == tok::star || Kind == tok::caret)
6423 return true;
6424
6425 // OpenCL 2.0 and later define this keyword.
6426 if (Kind == tok::kw_pipe && Lang.OpenCL &&
6427 Lang.getOpenCLCompatibleVersion() >= 200)
6428 return true;
6429
6430 if (!Lang.CPlusPlus)
6431 return false;
6432
6433 if (Kind == tok::amp)
6434 return true;
6435
6436 // We parse rvalue refs in C++03, because otherwise the errors are scary.
6437 // But we must not parse them in conversion-type-ids and new-type-ids, since
6438 // those can be legitimately followed by a && operator.
6439 // (The same thing can in theory happen after a trailing-return-type, but
6440 // since those are a C++11 feature, there is no rejects-valid issue there.)
6441 if (Kind == tok::ampamp)
6442 return Lang.CPlusPlus11 || (TheContext != DeclaratorContext::ConversionId &&
6443 TheContext != DeclaratorContext::CXXNew);
6444
6445 return false;
6446}
6447
6448// Indicates whether the given declarator is a pipe declarator.
6449static bool isPipeDeclarator(const Declarator &D) {
6450 const unsigned NumTypes = D.getNumTypeObjects();
6451
6452 for (unsigned Idx = 0; Idx != NumTypes; ++Idx)
6453 if (DeclaratorChunk::Pipe == D.getTypeObject(i: Idx).Kind)
6454 return true;
6455
6456 return false;
6457}
6458
6459void Parser::ParseDeclaratorInternal(Declarator &D,
6460 DirectDeclParseFunction DirectDeclParser) {
6461 if (Diags.hasAllExtensionsSilenced())
6462 D.setExtension();
6463
6464 // C++ member pointers start with a '::' or a nested-name.
6465 // Member pointers get special handling, since there's no place for the
6466 // scope spec in the generic path below.
6467 // A 'decltype' can only begin a nested-name-specifier if it is followed by
6468 // '('; otherwise it is not a decltype-specifier at all and must not be
6469 // parsed as one.
6470 if (getLangOpts().CPlusPlus &&
6471 (Tok.is(K: tok::coloncolon) ||
6472 (Tok.is(K: tok::kw_decltype) && NextToken().is(K: tok::l_paren)) ||
6473 (Tok.is(K: tok::identifier) &&
6474 (NextToken().is(K: tok::coloncolon) || NextToken().is(K: tok::less))) ||
6475 Tok.is(K: tok::annot_cxxscope))) {
6476 TentativeParsingAction TPA(*this, /*Unannotated=*/true);
6477 bool EnteringContext = D.getContext() == DeclaratorContext::File ||
6478 D.getContext() == DeclaratorContext::Member;
6479 CXXScopeSpec SS;
6480 SS.setTemplateParamLists(D.getTemplateParameterLists());
6481
6482 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
6483 /*ObjectHasErrors=*/false,
6484 /*EnteringContext=*/false,
6485 /*MayBePseudoDestructor=*/nullptr,
6486 /*IsTypename=*/false, /*LastII=*/nullptr,
6487 /*OnlyNamespace=*/false,
6488 /*InUsingDeclaration=*/false,
6489 /*Disambiguation=*/EnteringContext,
6490 /*IsAddressOfOperand=*/false,
6491 /*IsInDeclarationContext=*/true) ||
6492
6493 SS.isEmpty() || SS.isInvalid() || !EnteringContext ||
6494 Tok.is(K: tok::star)) {
6495 TPA.Commit();
6496 if (SS.isNotEmpty() && Tok.is(K: tok::star)) {
6497 if (SS.isValid()) {
6498 checkCompoundToken(FirstTokLoc: SS.getEndLoc(), FirstTokKind: tok::coloncolon,
6499 Op: CompoundToken::MemberPtr);
6500 }
6501
6502 SourceLocation StarLoc = ConsumeToken();
6503 D.SetRangeEnd(StarLoc);
6504 DeclSpec DS(AttrFactory);
6505 ParseTypeQualifierListOpt(DS);
6506 D.ExtendWithDeclSpec(DS);
6507
6508 // Recurse to parse whatever is left.
6509 Actions.runWithSufficientStackSpace(Loc: D.getBeginLoc(), Fn: [&] {
6510 ParseDeclaratorInternal(D, DirectDeclParser);
6511 });
6512
6513 // Sema will have to catch (syntactically invalid) pointers into global
6514 // scope. It has to catch pointers into namespace scope anyway.
6515 D.AddTypeInfo(TI: DeclaratorChunk::getMemberPointer(
6516 SS, TypeQuals: DS.getTypeQualifiers(), StarLoc, EndLoc: DS.getEndLoc()),
6517 attrs: std::move(DS.getAttributes()),
6518 /*EndLoc=*/SourceLocation());
6519 return;
6520 }
6521 } else {
6522 TPA.Revert();
6523 SS.clear();
6524 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
6525 /*ObjectHasErrors=*/false,
6526 /*EnteringContext=*/true);
6527 }
6528
6529 if (SS.isNotEmpty()) {
6530 // The scope spec really belongs to the direct-declarator.
6531 if (D.mayHaveIdentifier())
6532 D.getCXXScopeSpec() = std::move(SS);
6533 else
6534 AnnotateScopeToken(SS, IsNewAnnotation: true);
6535
6536 if (DirectDeclParser)
6537 (this->*DirectDeclParser)(D);
6538 return;
6539 }
6540 }
6541
6542 tok::TokenKind Kind = Tok.getKind();
6543
6544 if (D.getDeclSpec().isTypeSpecPipe() && !isPipeDeclarator(D)) {
6545 DeclSpec DS(AttrFactory);
6546 ParseTypeQualifierListOpt(DS);
6547
6548 D.AddTypeInfo(
6549 TI: DeclaratorChunk::getPipe(TypeQuals: DS.getTypeQualifiers(), Loc: DS.getPipeLoc()),
6550 attrs: std::move(DS.getAttributes()), EndLoc: SourceLocation());
6551 }
6552
6553 // Not a pointer, C++ reference, or block.
6554 if (!isPtrOperatorToken(Kind, Lang: getLangOpts(), TheContext: D.getContext())) {
6555 if (DirectDeclParser)
6556 (this->*DirectDeclParser)(D);
6557 return;
6558 }
6559
6560 // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference,
6561 // '&&' -> rvalue reference
6562 SourceLocation Loc = ConsumeToken(); // Eat the *, ^, & or &&.
6563 D.SetRangeEnd(Loc);
6564
6565 if (Kind == tok::star || Kind == tok::caret) {
6566 // Is a pointer.
6567 DeclSpec DS(AttrFactory);
6568
6569 // GNU attributes are not allowed here in a new-type-id, but Declspec and
6570 // C++11 attributes are allowed.
6571 unsigned Reqs = AR_CXX11AttributesParsed | AR_DeclspecAttributesParsed |
6572 ((D.getContext() != DeclaratorContext::CXXNew)
6573 ? AR_GNUAttributesParsed
6574 : AR_GNUAttributesParsedAndRejected);
6575 ParseTypeQualifierListOpt(DS, AttrReqs: Reqs, /*AtomicOrPtrauthAllowed=*/true,
6576 IdentifierRequired: !D.mayOmitIdentifier());
6577 D.ExtendWithDeclSpec(DS);
6578
6579 // Recursively parse the declarator.
6580 Actions.runWithSufficientStackSpace(
6581 Loc: D.getBeginLoc(), Fn: [&] { ParseDeclaratorInternal(D, DirectDeclParser); });
6582 if (Kind == tok::star)
6583 // Remember that we parsed a pointer type, and remember the type-quals.
6584 D.AddTypeInfo(TI: DeclaratorChunk::getPointer(
6585 TypeQuals: DS.getTypeQualifiers(), Loc, ConstQualLoc: DS.getConstSpecLoc(),
6586 VolatileQualLoc: DS.getVolatileSpecLoc(), RestrictQualLoc: DS.getRestrictSpecLoc(),
6587 AtomicQualLoc: DS.getAtomicSpecLoc(), UnalignedQualLoc: DS.getUnalignedSpecLoc(),
6588 OverflowBehaviorLoc: DS.getOverflowBehaviorLoc(), OverflowBehaviorIsWrap: DS.isWrapSpecified()),
6589 attrs: std::move(DS.getAttributes()), EndLoc: SourceLocation());
6590 else
6591 // Remember that we parsed a Block type, and remember the type-quals.
6592 D.AddTypeInfo(
6593 TI: DeclaratorChunk::getBlockPointer(TypeQuals: DS.getTypeQualifiers(), Loc),
6594 attrs: std::move(DS.getAttributes()), EndLoc: SourceLocation());
6595 } else {
6596 // Is a reference
6597 DeclSpec DS(AttrFactory);
6598
6599 // Complain about rvalue references in C++03, but then go on and build
6600 // the declarator.
6601 if (Kind == tok::ampamp)
6602 Diag(Loc, DiagID: getLangOpts().CPlusPlus11 ?
6603 diag::warn_cxx98_compat_rvalue_reference :
6604 diag::ext_rvalue_reference);
6605
6606 // GNU-style and C++11 attributes are allowed here, as is restrict.
6607 ParseTypeQualifierListOpt(DS);
6608 D.ExtendWithDeclSpec(DS);
6609
6610 // C++ 8.3.2p1: cv-qualified references are ill-formed except when the
6611 // cv-qualifiers are introduced through the use of a typedef or of a
6612 // template type argument, in which case the cv-qualifiers are ignored.
6613 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
6614 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
6615 Diag(Loc: DS.getConstSpecLoc(),
6616 DiagID: diag::err_invalid_reference_qualifier_application) << "const";
6617 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
6618 Diag(Loc: DS.getVolatileSpecLoc(),
6619 DiagID: diag::err_invalid_reference_qualifier_application) << "volatile";
6620 // 'restrict' is permitted as an extension.
6621 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
6622 Diag(Loc: DS.getAtomicSpecLoc(),
6623 DiagID: diag::err_invalid_reference_qualifier_application) << "_Atomic";
6624 }
6625
6626 // Recursively parse the declarator.
6627 Actions.runWithSufficientStackSpace(
6628 Loc: D.getBeginLoc(), Fn: [&] { ParseDeclaratorInternal(D, DirectDeclParser); });
6629
6630 if (D.getNumTypeObjects() > 0) {
6631 // C++ [dcl.ref]p4: There shall be no references to references.
6632 DeclaratorChunk& InnerChunk = D.getTypeObject(i: D.getNumTypeObjects() - 1);
6633 if (InnerChunk.Kind == DeclaratorChunk::Reference) {
6634 if (const IdentifierInfo *II = D.getIdentifier())
6635 Diag(Loc: InnerChunk.Loc, DiagID: diag::err_illegal_decl_reference_to_reference)
6636 << II;
6637 else
6638 Diag(Loc: InnerChunk.Loc, DiagID: diag::err_illegal_decl_reference_to_reference)
6639 << "type name";
6640
6641 // Once we've complained about the reference-to-reference, we
6642 // can go ahead and build the (technically ill-formed)
6643 // declarator: reference collapsing will take care of it.
6644 }
6645 }
6646
6647 // Remember that we parsed a reference type.
6648 D.AddTypeInfo(TI: DeclaratorChunk::getReference(TypeQuals: DS.getTypeQualifiers(), Loc,
6649 lvalue: Kind == tok::amp),
6650 attrs: std::move(DS.getAttributes()), EndLoc: SourceLocation());
6651 }
6652}
6653
6654// When correcting from misplaced brackets before the identifier, the location
6655// is saved inside the declarator so that other diagnostic messages can use
6656// them. This extracts and returns that location, or returns the provided
6657// location if a stored location does not exist.
6658static SourceLocation getMissingDeclaratorIdLoc(Declarator &D,
6659 SourceLocation Loc) {
6660 if (D.getName().StartLocation.isInvalid() &&
6661 D.getName().EndLocation.isValid())
6662 return D.getName().EndLocation;
6663
6664 return Loc;
6665}
6666
6667void Parser::ParseDirectDeclarator(Declarator &D) {
6668 DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec());
6669
6670 if (getLangOpts().CPlusPlus && D.mayHaveIdentifier()) {
6671 // This might be a C++17 structured binding.
6672 if (Tok.is(K: tok::l_square) && !D.mayOmitIdentifier() &&
6673 D.getCXXScopeSpec().isEmpty())
6674 return ParseDecompositionDeclarator(D);
6675
6676 // Don't parse FOO:BAR as if it were a typo for FOO::BAR inside a class, in
6677 // this context it is a bitfield. Also in range-based for statement colon
6678 // may delimit for-range-declaration.
6679 ColonProtectionRAIIObject X(
6680 *this, D.getContext() == DeclaratorContext::Member ||
6681 (D.getContext() == DeclaratorContext::ForInit &&
6682 getLangOpts().CPlusPlus11));
6683
6684 // ParseDeclaratorInternal might already have parsed the scope.
6685 if (D.getCXXScopeSpec().isEmpty()) {
6686 bool EnteringContext = D.getContext() == DeclaratorContext::File ||
6687 D.getContext() == DeclaratorContext::Member;
6688 ParseOptionalCXXScopeSpecifier(
6689 SS&: D.getCXXScopeSpec(), /*ObjectType=*/nullptr,
6690 /*ObjectHasErrors=*/false, EnteringContext);
6691 }
6692
6693 // C++23 [basic.scope.namespace]p1:
6694 // For each non-friend redeclaration or specialization whose target scope
6695 // is or is contained by the scope, the portion after the declarator-id,
6696 // class-head-name, or enum-head-name is also included in the scope.
6697 // C++23 [basic.scope.class]p1:
6698 // For each non-friend redeclaration or specialization whose target scope
6699 // is or is contained by the scope, the portion after the declarator-id,
6700 // class-head-name, or enum-head-name is also included in the scope.
6701 //
6702 // FIXME: We should not be doing this for friend declarations; they have
6703 // their own special lookup semantics specified by [basic.lookup.unqual]p6.
6704 if (D.getCXXScopeSpec().isValid()) {
6705 if (Actions.ShouldEnterDeclaratorScope(S: getCurScope(),
6706 SS: D.getCXXScopeSpec()))
6707 // Change the declaration context for name lookup, until this function
6708 // is exited (and the declarator has been parsed).
6709 DeclScopeObj.EnterDeclaratorScope();
6710 else if (getObjCDeclContext()) {
6711 // Ensure that we don't interpret the next token as an identifier when
6712 // dealing with declarations in an Objective-C container.
6713 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6714 D.setInvalidType(true);
6715 ConsumeToken();
6716 goto PastIdentifier;
6717 }
6718 }
6719
6720 // C++0x [dcl.fct]p14:
6721 // There is a syntactic ambiguity when an ellipsis occurs at the end of a
6722 // parameter-declaration-clause without a preceding comma. In this case,
6723 // the ellipsis is parsed as part of the abstract-declarator if the type
6724 // of the parameter either names a template parameter pack that has not
6725 // been expanded or contains auto; otherwise, it is parsed as part of the
6726 // parameter-declaration-clause.
6727 if (Tok.is(K: tok::ellipsis) && D.getCXXScopeSpec().isEmpty() &&
6728 !((D.getContext() == DeclaratorContext::Prototype ||
6729 D.getContext() == DeclaratorContext::LambdaExprParameter ||
6730 D.getContext() == DeclaratorContext::BlockLiteral) &&
6731 NextToken().is(K: tok::r_paren) && !D.hasGroupingParens() &&
6732 !Actions.containsUnexpandedParameterPacks(D) &&
6733 D.getDeclSpec().getTypeSpecType() != TST_auto)) {
6734 SourceLocation EllipsisLoc = ConsumeToken();
6735 if (isPtrOperatorToken(Kind: Tok.getKind(), Lang: getLangOpts(), TheContext: D.getContext())) {
6736 // The ellipsis was put in the wrong place. Recover, and explain to
6737 // the user what they should have done.
6738 ParseDeclarator(D);
6739 if (EllipsisLoc.isValid())
6740 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
6741 return;
6742 } else
6743 D.setEllipsisLoc(EllipsisLoc);
6744
6745 // The ellipsis can't be followed by a parenthesized declarator. We
6746 // check for that in ParseParenDeclarator, after we have disambiguated
6747 // the l_paren token.
6748 }
6749
6750 if (Tok.isOneOf(Ks: tok::identifier, Ks: tok::kw_operator, Ks: tok::annot_template_id,
6751 Ks: tok::tilde)) {
6752 // We found something that indicates the start of an unqualified-id.
6753 // Parse that unqualified-id.
6754 bool AllowConstructorName;
6755 bool AllowDeductionGuide;
6756 if (D.getDeclSpec().hasTypeSpecifier()) {
6757 AllowConstructorName = false;
6758 AllowDeductionGuide = false;
6759 } else if (D.getCXXScopeSpec().isSet()) {
6760 AllowConstructorName = (D.getContext() == DeclaratorContext::File ||
6761 D.getContext() == DeclaratorContext::Member);
6762 AllowDeductionGuide = false;
6763 } else {
6764 AllowConstructorName = (D.getContext() == DeclaratorContext::Member);
6765 AllowDeductionGuide = (D.getContext() == DeclaratorContext::File ||
6766 D.getContext() == DeclaratorContext::Member);
6767 }
6768
6769 bool HadScope = D.getCXXScopeSpec().isValid();
6770 SourceLocation TemplateKWLoc;
6771 if (ParseUnqualifiedId(SS&: D.getCXXScopeSpec(),
6772 /*ObjectType=*/nullptr,
6773 /*ObjectHadErrors=*/false,
6774 /*EnteringContext=*/true,
6775 /*AllowDestructorName=*/true, AllowConstructorName,
6776 AllowDeductionGuide, TemplateKWLoc: &TemplateKWLoc,
6777 Result&: D.getName()) ||
6778 // Once we're past the identifier, if the scope was bad, mark the
6779 // whole declarator bad.
6780 D.getCXXScopeSpec().isInvalid()) {
6781 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6782 D.setInvalidType(true);
6783 } else {
6784 // ParseUnqualifiedId might have parsed a scope specifier during error
6785 // recovery. If it did so, enter that scope.
6786 if (!HadScope && D.getCXXScopeSpec().isValid() &&
6787 Actions.ShouldEnterDeclaratorScope(S: getCurScope(),
6788 SS: D.getCXXScopeSpec()))
6789 DeclScopeObj.EnterDeclaratorScope();
6790
6791 // Parsed the unqualified-id; update range information and move along.
6792 if (D.getSourceRange().getBegin().isInvalid())
6793 D.SetRangeBegin(D.getName().getSourceRange().getBegin());
6794 D.SetRangeEnd(D.getName().getSourceRange().getEnd());
6795 }
6796 goto PastIdentifier;
6797 }
6798
6799 if (D.getCXXScopeSpec().isNotEmpty()) {
6800 // We have a scope specifier but no following unqualified-id.
6801 Diag(Loc: PP.getLocForEndOfToken(Loc: D.getCXXScopeSpec().getEndLoc()),
6802 DiagID: diag::err_expected_unqualified_id)
6803 << /*C++*/1;
6804 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6805 goto PastIdentifier;
6806 }
6807 } else if (Tok.is(K: tok::identifier) && D.mayHaveIdentifier()) {
6808 assert(!getLangOpts().CPlusPlus &&
6809 "There's a C++-specific check for tok::identifier above");
6810 assert(Tok.getIdentifierInfo() && "Not an identifier?");
6811 D.SetIdentifier(Id: Tok.getIdentifierInfo(), IdLoc: Tok.getLocation());
6812 D.SetRangeEnd(Tok.getLocation());
6813 ConsumeToken();
6814 goto PastIdentifier;
6815 } else if (Tok.is(K: tok::identifier) && !D.mayHaveIdentifier()) {
6816 // We're not allowed an identifier here, but we got one. Try to figure out
6817 // if the user was trying to attach a name to the type, or whether the name
6818 // is some unrelated trailing syntax.
6819 bool DiagnoseIdentifier = false;
6820 if (D.hasGroupingParens())
6821 // An identifier within parens is unlikely to be intended to be anything
6822 // other than a name being "declared".
6823 DiagnoseIdentifier = true;
6824 else if (D.getContext() == DeclaratorContext::TemplateArg)
6825 // T<int N> is an accidental identifier; T<int N indicates a missing '>'.
6826 DiagnoseIdentifier =
6827 NextToken().isOneOf(Ks: tok::comma, Ks: tok::greater, Ks: tok::greatergreater);
6828 else if (D.getContext() == DeclaratorContext::AliasDecl ||
6829 D.getContext() == DeclaratorContext::AliasTemplate)
6830 // The most likely error is that the ';' was forgotten.
6831 DiagnoseIdentifier = NextToken().isOneOf(Ks: tok::comma, Ks: tok::semi);
6832 else if ((D.getContext() == DeclaratorContext::TrailingReturn ||
6833 D.getContext() == DeclaratorContext::TrailingReturnVar) &&
6834 !isCXX11VirtSpecifier(Tok))
6835 DiagnoseIdentifier = NextToken().isOneOf(
6836 Ks: tok::comma, Ks: tok::semi, Ks: tok::equal, Ks: tok::l_brace, Ks: tok::kw_try);
6837 if (DiagnoseIdentifier) {
6838 Diag(Loc: Tok.getLocation(), DiagID: diag::err_unexpected_unqualified_id)
6839 << FixItHint::CreateRemoval(RemoveRange: Tok.getLocation());
6840 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6841 ConsumeToken();
6842 goto PastIdentifier;
6843 }
6844 }
6845
6846 if (Tok.is(K: tok::l_paren)) {
6847 // If this might be an abstract-declarator followed by a direct-initializer,
6848 // check whether this is a valid declarator chunk. If it can't be, assume
6849 // that it's an initializer instead.
6850 if (D.mayOmitIdentifier() && D.mayBeFollowedByCXXDirectInit()) {
6851 RevertingTentativeParsingAction PA(*this);
6852 if (TryParseDeclarator(mayBeAbstract: true, mayHaveIdentifier: D.mayHaveIdentifier(), mayHaveDirectInit: true,
6853 mayHaveTrailingReturnType: D.getDeclSpec().getTypeSpecType() == TST_auto) ==
6854 TPResult::False) {
6855 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6856 goto PastIdentifier;
6857 }
6858 }
6859
6860 // direct-declarator: '(' declarator ')'
6861 // direct-declarator: '(' attributes declarator ')'
6862 // Example: 'char (*X)' or 'int (*XX)(void)'
6863 ParseParenDeclarator(D);
6864
6865 // As noted above, a structured binding declarator cannot be followed by any
6866 // declarator chunks.
6867 if (D.isDecompositionDeclarator())
6868 return;
6869
6870 // If the declarator was parenthesized, we entered the declarator
6871 // scope when parsing the parenthesized declarator, then exited
6872 // the scope already. Re-enter the scope, if we need to.
6873 if (D.getCXXScopeSpec().isSet()) {
6874 // If there was an error parsing parenthesized declarator, declarator
6875 // scope may have been entered before. Don't do it again.
6876 if (!D.isInvalidType() &&
6877 Actions.ShouldEnterDeclaratorScope(S: getCurScope(),
6878 SS: D.getCXXScopeSpec()))
6879 // Change the declaration context for name lookup, until this function
6880 // is exited (and the declarator has been parsed).
6881 DeclScopeObj.EnterDeclaratorScope();
6882 }
6883 } else if (D.mayOmitIdentifier()) {
6884 // This could be something simple like "int" (in which case the declarator
6885 // portion is empty), if an abstract-declarator is allowed.
6886 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6887
6888 // The grammar for abstract-pack-declarator does not allow grouping parens.
6889 // FIXME: Revisit this once core issue 1488 is resolved.
6890 if (D.hasEllipsis() && D.hasGroupingParens())
6891 Diag(Loc: PP.getLocForEndOfToken(Loc: D.getEllipsisLoc()),
6892 DiagID: diag::ext_abstract_pack_declarator_parens);
6893 } else {
6894 if (Tok.getKind() == tok::annot_pragma_parser_crash)
6895 LLVM_BUILTIN_TRAP;
6896 if (Tok.is(K: tok::l_square))
6897 return ParseMisplacedBracketDeclarator(D);
6898 if (D.getContext() == DeclaratorContext::Member) {
6899 // Objective-C++: Detect C++ keywords and try to prevent further errors by
6900 // treating these keyword as valid member names.
6901 if (getLangOpts().ObjC && getLangOpts().CPlusPlus &&
6902 !Tok.isAnnotation() && Tok.getIdentifierInfo() &&
6903 Tok.getIdentifierInfo()->isCPlusPlusKeyword(LangOpts: getLangOpts())) {
6904 Diag(Loc: getMissingDeclaratorIdLoc(D, Loc: Tok.getLocation()),
6905 DiagID: diag::err_expected_member_name_or_semi_objcxx_keyword)
6906 << Tok.getIdentifierInfo()
6907 << (D.getDeclSpec().isEmpty() ? SourceRange()
6908 : D.getDeclSpec().getSourceRange());
6909 D.SetIdentifier(Id: Tok.getIdentifierInfo(), IdLoc: Tok.getLocation());
6910 D.SetRangeEnd(Tok.getLocation());
6911 ConsumeToken();
6912 goto PastIdentifier;
6913 }
6914 Diag(Loc: getMissingDeclaratorIdLoc(D, Loc: Tok.getLocation()),
6915 DiagID: diag::err_expected_member_name_or_semi)
6916 << (D.getDeclSpec().isEmpty() ? SourceRange()
6917 : D.getDeclSpec().getSourceRange());
6918 } else {
6919 if (Tok.getKind() == tok::TokenKind::kw_while) {
6920 Diag(Tok, DiagID: diag::err_while_loop_outside_of_a_function);
6921 } else if (getLangOpts().CPlusPlus) {
6922 if (Tok.isOneOf(Ks: tok::period, Ks: tok::arrow))
6923 Diag(Tok, DiagID: diag::err_invalid_operator_on_type) << Tok.is(K: tok::arrow);
6924 else {
6925 SourceLocation Loc = D.getCXXScopeSpec().getEndLoc();
6926 if (Tok.isAtStartOfLine() && Loc.isValid())
6927 Diag(Loc: PP.getLocForEndOfToken(Loc), DiagID: diag::err_expected_unqualified_id)
6928 << getLangOpts().CPlusPlus;
6929 else
6930 Diag(Loc: getMissingDeclaratorIdLoc(D, Loc: Tok.getLocation()),
6931 DiagID: diag::err_expected_unqualified_id)
6932 << getLangOpts().CPlusPlus;
6933 }
6934 } else {
6935 Diag(Loc: getMissingDeclaratorIdLoc(D, Loc: Tok.getLocation()),
6936 DiagID: diag::err_expected_either)
6937 << tok::identifier << tok::l_paren;
6938 }
6939 }
6940 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
6941 D.setInvalidType(true);
6942 }
6943
6944 PastIdentifier:
6945 assert(D.isPastIdentifier() &&
6946 "Haven't past the location of the identifier yet?");
6947
6948 // Don't parse attributes unless we have parsed an unparenthesized name.
6949 if (D.hasName() && !D.getNumTypeObjects())
6950 MaybeParseCXX11Attributes(D);
6951
6952 while (true) {
6953 if (Tok.is(K: tok::l_paren)) {
6954 bool IsFunctionDeclaration = D.isFunctionDeclaratorAFunctionDeclaration();
6955 // Enter function-declaration scope, limiting any declarators to the
6956 // function prototype scope, including parameter declarators.
6957 ParseScope PrototypeScope(
6958 this, Scope::FunctionPrototypeScope | Scope::DeclScope |
6959 (IsFunctionDeclaration ? Scope::FunctionDeclarationScope
6960 : Scope::NoScope));
6961
6962 // The paren may be part of a C++ direct initializer, eg. "int x(1);".
6963 // In such a case, check if we actually have a function declarator; if it
6964 // is not, the declarator has been fully parsed.
6965 bool IsAmbiguous = false;
6966 if (getLangOpts().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) {
6967 // C++2a [temp.res]p5
6968 // A qualified-id is assumed to name a type if
6969 // - [...]
6970 // - it is a decl-specifier of the decl-specifier-seq of a
6971 // - [...]
6972 // - parameter-declaration in a member-declaration [...]
6973 // - parameter-declaration in a declarator of a function or function
6974 // template declaration whose declarator-id is qualified [...]
6975 auto AllowImplicitTypename = ImplicitTypenameContext::No;
6976 if (D.getCXXScopeSpec().isSet())
6977 AllowImplicitTypename =
6978 (ImplicitTypenameContext)Actions.isDeclaratorFunctionLike(D);
6979 else if (D.getContext() == DeclaratorContext::Member) {
6980 AllowImplicitTypename = ImplicitTypenameContext::Yes;
6981 }
6982
6983 // The name of the declarator, if any, is tentatively declared within
6984 // a possible direct initializer.
6985 TentativelyDeclaredIdentifiers.push_back(Elt: D.getIdentifier());
6986 bool IsFunctionDecl =
6987 isCXXFunctionDeclarator(IsAmbiguous: &IsAmbiguous, AllowImplicitTypename);
6988 TentativelyDeclaredIdentifiers.pop_back();
6989 if (!IsFunctionDecl)
6990 break;
6991 }
6992 ParsedAttributes attrs(AttrFactory);
6993 BalancedDelimiterTracker T(*this, tok::l_paren);
6994 T.consumeOpen();
6995 if (IsFunctionDeclaration)
6996 Actions.ActOnStartFunctionDeclarationDeclarator(D,
6997 TemplateParameterDepth);
6998 ParseFunctionDeclarator(D, FirstArgAttrs&: attrs, Tracker&: T, IsAmbiguous);
6999 if (IsFunctionDeclaration)
7000 Actions.ActOnFinishFunctionDeclarationDeclarator(D);
7001 PrototypeScope.Exit();
7002 } else if (Tok.is(K: tok::l_square)) {
7003 ParseBracketDeclarator(D);
7004 } else if (Tok.isRegularKeywordAttribute()) {
7005 // For consistency with attribute parsing.
7006 Diag(Tok, DiagID: diag::err_keyword_not_allowed) << Tok.getIdentifierInfo();
7007 bool TakesArgs = doesKeywordAttributeTakeArgs(Kind: Tok.getKind());
7008 ConsumeToken();
7009 if (TakesArgs) {
7010 BalancedDelimiterTracker T(*this, tok::l_paren);
7011 if (!T.consumeOpen())
7012 T.skipToEnd();
7013 }
7014 } else if (Tok.is(K: tok::kw_requires) && D.hasGroupingParens()) {
7015 // This declarator is declaring a function, but the requires clause is
7016 // in the wrong place:
7017 // void (f() requires true);
7018 // instead of
7019 // void f() requires true;
7020 // or
7021 // void (f()) requires true;
7022 Diag(Tok, DiagID: diag::err_requires_clause_inside_parens);
7023 ConsumeToken();
7024 ExprResult TrailingRequiresClause =
7025 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true);
7026 if (TrailingRequiresClause.isUsable() && D.isFunctionDeclarator() &&
7027 !D.hasTrailingRequiresClause())
7028 // We're already ill-formed if we got here but we'll accept it anyway.
7029 D.setTrailingRequiresClause(TrailingRequiresClause.get());
7030 } else {
7031 break;
7032 }
7033 }
7034}
7035
7036void Parser::ParseDecompositionDeclarator(Declarator &D) {
7037 assert(Tok.is(tok::l_square));
7038
7039 TentativeParsingAction PA(*this);
7040 BalancedDelimiterTracker T(*this, tok::l_square);
7041 T.consumeOpen();
7042
7043 if (isCXX11AttributeSpecifier() != CXX11AttributeKind::NotAttributeSpecifier)
7044 DiagnoseAndSkipCXX11Attributes();
7045
7046 // If this doesn't look like a structured binding, maybe it's a misplaced
7047 // array declarator.
7048 if (!(Tok.isOneOf(Ks: tok::identifier, Ks: tok::ellipsis) &&
7049 NextToken().isOneOf(Ks: tok::comma, Ks: tok::r_square, Ks: tok::kw_alignas,
7050 Ks: tok::identifier, Ks: tok::l_square, Ks: tok::ellipsis)) &&
7051 !(Tok.is(K: tok::r_square) &&
7052 NextToken().isOneOf(Ks: tok::equal, Ks: tok::l_brace))) {
7053 PA.Revert();
7054 return ParseMisplacedBracketDeclarator(D);
7055 }
7056
7057 SourceLocation PrevEllipsisLoc;
7058 SmallVector<DecompositionDeclarator::Binding, 32> Bindings;
7059 while (Tok.isNot(K: tok::r_square)) {
7060 if (!Bindings.empty()) {
7061 if (Tok.is(K: tok::comma))
7062 ConsumeToken();
7063 else {
7064 if (Tok.is(K: tok::identifier)) {
7065 SourceLocation EndLoc = getEndOfPreviousToken();
7066 Diag(Loc: EndLoc, DiagID: diag::err_expected)
7067 << tok::comma << FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: ",");
7068 } else {
7069 Diag(Tok, DiagID: diag::err_expected_comma_or_rsquare);
7070 }
7071
7072 SkipUntil(Toks: {tok::r_square, tok::comma, tok::identifier, tok::ellipsis},
7073 Flags: StopAtSemi | StopBeforeMatch);
7074 if (Tok.is(K: tok::comma))
7075 ConsumeToken();
7076 else if (Tok.is(K: tok::r_square))
7077 break;
7078 }
7079 }
7080
7081 if (isCXX11AttributeSpecifier() !=
7082 CXX11AttributeKind::NotAttributeSpecifier)
7083 DiagnoseAndSkipCXX11Attributes();
7084
7085 SourceLocation EllipsisLoc;
7086
7087 if (Tok.is(K: tok::ellipsis)) {
7088 Diag(Tok, DiagID: getLangOpts().CPlusPlus26 ? diag::warn_cxx23_compat_binding_pack
7089 : diag::ext_cxx_binding_pack);
7090 if (PrevEllipsisLoc.isValid()) {
7091 Diag(Tok, DiagID: diag::err_binding_multiple_ellipses);
7092 Diag(Loc: PrevEllipsisLoc, DiagID: diag::note_previous_ellipsis);
7093 break;
7094 }
7095 EllipsisLoc = Tok.getLocation();
7096 PrevEllipsisLoc = EllipsisLoc;
7097 ConsumeToken();
7098 }
7099
7100 if (Tok.isNot(K: tok::identifier)) {
7101 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
7102 break;
7103 }
7104
7105 IdentifierInfo *II = Tok.getIdentifierInfo();
7106 SourceLocation Loc = Tok.getLocation();
7107 ConsumeToken();
7108
7109 if (Tok.is(K: tok::ellipsis) && !PrevEllipsisLoc.isValid()) {
7110 DiagnoseMisplacedEllipsis(EllipsisLoc: Tok.getLocation(), CorrectLoc: Loc, AlreadyHasEllipsis: EllipsisLoc.isValid(),
7111 IdentifierHasName: true);
7112 EllipsisLoc = Tok.getLocation();
7113 ConsumeToken();
7114 }
7115
7116 ParsedAttributes Attrs(AttrFactory);
7117 if (isCXX11AttributeSpecifier() !=
7118 CXX11AttributeKind::NotAttributeSpecifier) {
7119 Diag(Tok, DiagID: getLangOpts().CPlusPlus26
7120 ? diag::warn_cxx23_compat_decl_attrs_on_binding
7121 : diag::ext_decl_attrs_on_binding);
7122 MaybeParseCXX11Attributes(Attrs);
7123 }
7124
7125 Bindings.push_back(Elt: {.Name: II, .NameLoc: Loc, .Attrs: std::move(Attrs), .EllipsisLoc: EllipsisLoc});
7126 }
7127
7128 if (Tok.isNot(K: tok::r_square))
7129 // We've already diagnosed a problem here.
7130 T.skipToEnd();
7131 else {
7132 // C++17 does not allow the identifier-list in a structured binding
7133 // to be empty.
7134 if (Bindings.empty())
7135 Diag(Loc: Tok.getLocation(), DiagID: diag::ext_decomp_decl_empty);
7136
7137 T.consumeClose();
7138 }
7139
7140 PA.Commit();
7141
7142 return D.setDecompositionBindings(LSquareLoc: T.getOpenLocation(), Bindings,
7143 RSquareLoc: T.getCloseLocation());
7144}
7145
7146void Parser::ParseParenDeclarator(Declarator &D) {
7147 BalancedDelimiterTracker T(*this, tok::l_paren);
7148 T.consumeOpen();
7149
7150 assert(!D.isPastIdentifier() && "Should be called before passing identifier");
7151
7152 // Eat any attributes before we look at whether this is a grouping or function
7153 // declarator paren. If this is a grouping paren, the attribute applies to
7154 // the type being built up, for example:
7155 // int (__attribute__(()) *x)(long y)
7156 // If this ends up not being a grouping paren, the attribute applies to the
7157 // first argument, for example:
7158 // int (__attribute__(()) int x)
7159 // In either case, we need to eat any attributes to be able to determine what
7160 // sort of paren this is.
7161 //
7162 ParsedAttributes attrs(AttrFactory);
7163 bool RequiresArg = false;
7164 if (Tok.is(K: tok::kw___attribute)) {
7165 ParseGNUAttributes(Attrs&: attrs);
7166
7167 // We require that the argument list (if this is a non-grouping paren) be
7168 // present even if the attribute list was empty.
7169 RequiresArg = true;
7170 }
7171
7172 // Eat any Microsoft extensions.
7173 ParseMicrosoftTypeAttributes(attrs);
7174
7175 // Eat any Borland extensions.
7176 if (Tok.is(K: tok::kw___pascal))
7177 ParseBorlandTypeAttributes(attrs);
7178
7179 // If we haven't past the identifier yet (or where the identifier would be
7180 // stored, if this is an abstract declarator), then this is probably just
7181 // grouping parens. However, if this could be an abstract-declarator, then
7182 // this could also be the start of function arguments (consider 'void()').
7183 bool isGrouping;
7184
7185 if (!D.mayOmitIdentifier()) {
7186 // If this can't be an abstract-declarator, this *must* be a grouping
7187 // paren, because we haven't seen the identifier yet.
7188 isGrouping = true;
7189 } else if (Tok.is(K: tok::r_paren) || // 'int()' is a function.
7190 ((getLangOpts().CPlusPlus || getLangOpts().C23) &&
7191 Tok.is(K: tok::ellipsis) &&
7192 NextToken().is(K: tok::r_paren)) || // C++ int(...)
7193 isDeclarationSpecifier(
7194 AllowImplicitTypename: ImplicitTypenameContext::No) || // 'int(int)' is a function.
7195 isCXX11AttributeSpecifier() !=
7196 CXX11AttributeKind::NotAttributeSpecifier) { // 'int([[]]int)'
7197 // is a function.
7198 // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
7199 // considered to be a type, not a K&R identifier-list.
7200 isGrouping = false;
7201 } else {
7202 // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
7203 isGrouping = true;
7204 }
7205
7206 // If this is a grouping paren, handle:
7207 // direct-declarator: '(' declarator ')'
7208 // direct-declarator: '(' attributes declarator ')'
7209 if (isGrouping) {
7210 SourceLocation EllipsisLoc = D.getEllipsisLoc();
7211 D.setEllipsisLoc(SourceLocation());
7212
7213 bool hadGroupingParens = D.hasGroupingParens();
7214 D.setGroupingParens(true);
7215 ParseDeclaratorInternal(D, DirectDeclParser: &Parser::ParseDirectDeclarator);
7216 // Match the ')'.
7217 T.consumeClose();
7218 D.AddTypeInfo(
7219 TI: DeclaratorChunk::getParen(LParenLoc: T.getOpenLocation(), RParenLoc: T.getCloseLocation()),
7220 attrs: std::move(attrs), EndLoc: T.getCloseLocation());
7221
7222 D.setGroupingParens(hadGroupingParens);
7223
7224 // An ellipsis cannot be placed outside parentheses.
7225 if (EllipsisLoc.isValid())
7226 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
7227
7228 return;
7229 }
7230
7231 // Okay, if this wasn't a grouping paren, it must be the start of a function
7232 // argument list. Recognize that this declarator will never have an
7233 // identifier (and remember where it would have been), then call into
7234 // ParseFunctionDeclarator to handle of argument list.
7235 D.SetIdentifier(Id: nullptr, IdLoc: Tok.getLocation());
7236
7237 // Enter function-declaration scope, limiting any declarators to the
7238 // function prototype scope, including parameter declarators.
7239 ParseScope PrototypeScope(this,
7240 Scope::FunctionPrototypeScope | Scope::DeclScope |
7241 (D.isFunctionDeclaratorAFunctionDeclaration()
7242 ? Scope::FunctionDeclarationScope
7243 : Scope::NoScope));
7244 ParseFunctionDeclarator(D, FirstArgAttrs&: attrs, Tracker&: T, IsAmbiguous: false, RequiresArg);
7245 PrototypeScope.Exit();
7246}
7247
7248void Parser::InitCXXThisScopeForDeclaratorIfRelevant(
7249 const Declarator &D, const DeclSpec &DS,
7250 std::optional<Sema::CXXThisScopeRAII> &ThisScope) {
7251 // C++11 [expr.prim.general]p3:
7252 // If a declaration declares a member function or member function
7253 // template of a class X, the expression this is a prvalue of type
7254 // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
7255 // and the end of the function-definition, member-declarator, or
7256 // declarator.
7257 // FIXME: currently, "static" case isn't handled correctly.
7258 bool IsCXX11MemberFunction =
7259 getLangOpts().CPlusPlus11 &&
7260 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
7261 (D.getContext() == DeclaratorContext::Member
7262 ? !D.getDeclSpec().isFriendSpecified()
7263 : D.getContext() == DeclaratorContext::File &&
7264 D.getCXXScopeSpec().isValid() &&
7265 Actions.CurContext->isRecord());
7266 if (!IsCXX11MemberFunction)
7267 return;
7268
7269 Qualifiers Q = Qualifiers::fromCVRUMask(CVRU: DS.getTypeQualifiers());
7270 if (D.getDeclSpec().hasConstexprSpecifier() && !getLangOpts().CPlusPlus14)
7271 Q.addConst();
7272 // FIXME: Collect C++ address spaces.
7273 // If there are multiple different address spaces, the source is invalid.
7274 // Carry on using the first addr space for the qualifiers of 'this'.
7275 // The diagnostic will be given later while creating the function
7276 // prototype for the method.
7277 if (getLangOpts().OpenCLCPlusPlus) {
7278 for (ParsedAttr &attr : DS.getAttributes()) {
7279 LangAS ASIdx = attr.asOpenCLLangAS();
7280 if (ASIdx != LangAS::Default) {
7281 Q.addAddressSpace(space: ASIdx);
7282 break;
7283 }
7284 }
7285 }
7286 ThisScope.emplace(args&: Actions, args: dyn_cast<CXXRecordDecl>(Val: Actions.CurContext), args&: Q,
7287 args&: IsCXX11MemberFunction);
7288}
7289
7290void Parser::ParseFunctionDeclarator(Declarator &D,
7291 ParsedAttributes &FirstArgAttrs,
7292 BalancedDelimiterTracker &Tracker,
7293 bool IsAmbiguous,
7294 bool RequiresArg) {
7295 assert(getCurScope()->isFunctionPrototypeScope() &&
7296 "Should call from a Function scope");
7297 // lparen is already consumed!
7298 assert(D.isPastIdentifier() && "Should not call before identifier!");
7299
7300 // This should be true when the function has typed arguments.
7301 // Otherwise, it is treated as a K&R-style function.
7302 bool HasProto = false;
7303 // Build up an array of information about the parsed arguments.
7304 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
7305 // Remember where we see an ellipsis, if any.
7306 SourceLocation EllipsisLoc;
7307
7308 DeclSpec DS(AttrFactory);
7309 bool RefQualifierIsLValueRef = true;
7310 SourceLocation RefQualifierLoc;
7311 ExceptionSpecificationType ESpecType = EST_None;
7312 SourceRange ESpecRange;
7313 SmallVector<ParsedType, 2> DynamicExceptions;
7314 SmallVector<SourceRange, 2> DynamicExceptionRanges;
7315 ExprResult NoexceptExpr;
7316 CachedTokens *ExceptionSpecTokens = nullptr;
7317 ParsedAttributes FnAttrs(AttrFactory);
7318 TypeResult TrailingReturnType;
7319 SourceLocation TrailingReturnTypeLoc;
7320
7321 /* LocalEndLoc is the end location for the local FunctionTypeLoc.
7322 EndLoc is the end location for the function declarator.
7323 They differ for trailing return types. */
7324 SourceLocation StartLoc, LocalEndLoc, EndLoc;
7325 SourceLocation LParenLoc, RParenLoc;
7326 LParenLoc = Tracker.getOpenLocation();
7327 StartLoc = LParenLoc;
7328
7329 if (isFunctionDeclaratorIdentifierList()) {
7330 if (RequiresArg)
7331 Diag(Tok, DiagID: diag::err_argument_required_after_attribute);
7332
7333 ParseFunctionDeclaratorIdentifierList(D, ParamInfo);
7334
7335 Tracker.consumeClose();
7336 RParenLoc = Tracker.getCloseLocation();
7337 LocalEndLoc = RParenLoc;
7338 EndLoc = RParenLoc;
7339
7340 // If there are attributes following the identifier list, parse them and
7341 // prohibit them.
7342 MaybeParseCXX11Attributes(Attrs&: FnAttrs);
7343 ProhibitAttributes(Attrs&: FnAttrs);
7344 } else {
7345 if (Tok.isNot(K: tok::r_paren))
7346 ParseParameterDeclarationClause(D, attrs&: FirstArgAttrs, ParamInfo, EllipsisLoc);
7347 else if (RequiresArg)
7348 Diag(Tok, DiagID: diag::err_argument_required_after_attribute);
7349
7350 // OpenCL disallows functions without a prototype, but it doesn't enforce
7351 // strict prototypes as in C23 because it allows a function definition to
7352 // have an identifier list. See OpenCL 3.0 6.11/g for more details.
7353 HasProto = ParamInfo.size() || getLangOpts().requiresStrictPrototypes() ||
7354 getLangOpts().OpenCL;
7355
7356 // If we have the closing ')', eat it.
7357 Tracker.consumeClose();
7358 RParenLoc = Tracker.getCloseLocation();
7359 LocalEndLoc = RParenLoc;
7360 EndLoc = RParenLoc;
7361
7362 if (getLangOpts().CPlusPlus) {
7363 // FIXME: Accept these components in any order, and produce fixits to
7364 // correct the order if the user gets it wrong. Ideally we should deal
7365 // with the pure-specifier in the same way.
7366
7367 // Parse cv-qualifier-seq[opt].
7368 ParseTypeQualifierListOpt(
7369 DS, AttrReqs: AR_NoAttributesParsed,
7370 /*AtomicOrPtrauthAllowed=*/false,
7371 /*IdentifierRequired=*/false, CodeCompletionHandler: [&]() {
7372 Actions.CodeCompletion().CodeCompleteFunctionQualifiers(DS, D);
7373 });
7374 if (!DS.getSourceRange().getEnd().isInvalid()) {
7375 EndLoc = DS.getSourceRange().getEnd();
7376 }
7377
7378 // Parse ref-qualifier[opt].
7379 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc))
7380 EndLoc = RefQualifierLoc;
7381
7382 std::optional<Sema::CXXThisScopeRAII> ThisScope;
7383 InitCXXThisScopeForDeclaratorIfRelevant(D, DS, ThisScope);
7384
7385 // C++ [class.mem.general]p8:
7386 // A complete-class context of a class (template) is a
7387 // - function body,
7388 // - default argument,
7389 // - default template argument,
7390 // - noexcept-specifier, or
7391 // - default member initializer
7392 // within the member-specification of the class or class template.
7393 //
7394 // Parse exception-specification[opt]. If we are in the
7395 // member-specification of a class or class template, this is a
7396 // complete-class context and parsing of the noexcept-specifier should be
7397 // delayed (even if this is a friend declaration).
7398 bool Delayed = D.getContext() == DeclaratorContext::Member &&
7399 D.isFunctionDeclaratorAFunctionDeclaration();
7400 if (Delayed && Actions.isLibstdcxxEagerExceptionSpecHack(D) &&
7401 GetLookAheadToken(N: 0).is(K: tok::kw_noexcept) &&
7402 GetLookAheadToken(N: 1).is(K: tok::l_paren) &&
7403 GetLookAheadToken(N: 2).is(K: tok::kw_noexcept) &&
7404 GetLookAheadToken(N: 3).is(K: tok::l_paren) &&
7405 GetLookAheadToken(N: 4).is(K: tok::identifier) &&
7406 GetLookAheadToken(N: 4).getIdentifierInfo()->isStr(Str: "swap")) {
7407 // HACK: We've got an exception-specification
7408 // noexcept(noexcept(swap(...)))
7409 // or
7410 // noexcept(noexcept(swap(...)) && noexcept(swap(...)))
7411 // on a 'swap' member function. This is a libstdc++ bug; the lookup
7412 // for 'swap' will only find the function we're currently declaring,
7413 // whereas it expects to find a non-member swap through ADL. Turn off
7414 // delayed parsing to give it a chance to find what it expects.
7415 Delayed = false;
7416 }
7417 ESpecType = tryParseExceptionSpecification(Delayed,
7418 SpecificationRange&: ESpecRange,
7419 DynamicExceptions,
7420 DynamicExceptionRanges,
7421 NoexceptExpr,
7422 ExceptionSpecTokens);
7423 if (ESpecType != EST_None)
7424 EndLoc = ESpecRange.getEnd();
7425
7426 // Parse attribute-specifier-seq[opt]. Per DR 979 and DR 1297, this goes
7427 // after the exception-specification.
7428 MaybeParseCXX11Attributes(Attrs&: FnAttrs);
7429
7430 // Parse trailing-return-type[opt].
7431 LocalEndLoc = EndLoc;
7432 if (getLangOpts().CPlusPlus11 && Tok.is(K: tok::arrow)) {
7433 Diag(Tok, DiagID: diag::warn_cxx98_compat_trailing_return_type);
7434 if (D.getDeclSpec().getTypeSpecType() == TST_auto)
7435 StartLoc = D.getDeclSpec().getTypeSpecTypeLoc();
7436 LocalEndLoc = Tok.getLocation();
7437 SourceRange Range;
7438 TrailingReturnType =
7439 ParseTrailingReturnType(Range, MayBeFollowedByDirectInit: D.mayBeFollowedByCXXDirectInit());
7440 TrailingReturnTypeLoc = Range.getBegin();
7441 EndLoc = Range.getEnd();
7442 }
7443 } else {
7444 MaybeParseCXX11Attributes(Attrs&: FnAttrs);
7445 }
7446 }
7447
7448 // Collect non-parameter declarations from the prototype if this is a function
7449 // declaration. They will be moved into the scope of the function. Only do
7450 // this in C and not C++, where the decls will continue to live in the
7451 // surrounding context.
7452 SmallVector<NamedDecl *, 0> DeclsInPrototype;
7453 if (getCurScope()->isFunctionDeclarationScope() && !getLangOpts().CPlusPlus) {
7454 for (Decl *D : getCurScope()->decls()) {
7455 NamedDecl *ND = dyn_cast<NamedDecl>(Val: D);
7456 if (!ND || isa<ParmVarDecl>(Val: ND))
7457 continue;
7458 DeclsInPrototype.push_back(Elt: ND);
7459 }
7460 // Sort DeclsInPrototype based on raw encoding of the source location.
7461 // Scope::decls() is iterating over a SmallPtrSet so sort the Decls before
7462 // moving to DeclContext. This provides a stable ordering for traversing
7463 // Decls in DeclContext, which is important for tasks like ASTWriter for
7464 // deterministic output.
7465 llvm::sort(C&: DeclsInPrototype, Comp: [](Decl *D1, Decl *D2) {
7466 return D1->getLocation().getRawEncoding() <
7467 D2->getLocation().getRawEncoding();
7468 });
7469 }
7470
7471 // Remember that we parsed a function type, and remember the attributes.
7472 D.AddTypeInfo(TI: DeclaratorChunk::getFunction(
7473 HasProto, IsAmbiguous, LParenLoc, Params: ParamInfo.data(),
7474 NumParams: ParamInfo.size(), EllipsisLoc, RParenLoc,
7475 RefQualifierIsLvalueRef: RefQualifierIsLValueRef, RefQualifierLoc,
7476 /*MutableLoc=*/SourceLocation(),
7477 ESpecType, ESpecRange, Exceptions: DynamicExceptions.data(),
7478 ExceptionRanges: DynamicExceptionRanges.data(), NumExceptions: DynamicExceptions.size(),
7479 NoexceptExpr: NoexceptExpr.isUsable() ? NoexceptExpr.get() : nullptr,
7480 ExceptionSpecTokens, DeclsInPrototype, LocalRangeBegin: StartLoc,
7481 LocalRangeEnd: LocalEndLoc, TheDeclarator&: D, TrailingReturnType, TrailingReturnTypeLoc,
7482 MethodQualifiers: &DS),
7483 attrs: std::move(FnAttrs), EndLoc);
7484}
7485
7486bool Parser::ParseRefQualifier(bool &RefQualifierIsLValueRef,
7487 SourceLocation &RefQualifierLoc) {
7488 if (Tok.isOneOf(Ks: tok::amp, Ks: tok::ampamp)) {
7489 Diag(Tok, DiagID: getLangOpts().CPlusPlus11 ?
7490 diag::warn_cxx98_compat_ref_qualifier :
7491 diag::ext_ref_qualifier);
7492
7493 RefQualifierIsLValueRef = Tok.is(K: tok::amp);
7494 RefQualifierLoc = ConsumeToken();
7495 return true;
7496 }
7497 return false;
7498}
7499
7500bool Parser::isFunctionDeclaratorIdentifierList() {
7501 return !getLangOpts().requiresStrictPrototypes()
7502 && Tok.is(K: tok::identifier)
7503 && !TryAltiVecVectorToken()
7504 // K&R identifier lists can't have typedefs as identifiers, per C99
7505 // 6.7.5.3p11.
7506 && (TryAnnotateTypeOrScopeToken() || !Tok.is(K: tok::annot_typename))
7507 // Identifier lists follow a really simple grammar: the identifiers can
7508 // be followed *only* by a ", identifier" or ")". However, K&R
7509 // identifier lists are really rare in the brave new modern world, and
7510 // it is very common for someone to typo a type in a non-K&R style
7511 // list. If we are presented with something like: "void foo(intptr x,
7512 // float y)", we don't want to start parsing the function declarator as
7513 // though it is a K&R style declarator just because intptr is an
7514 // invalid type.
7515 //
7516 // To handle this, we check to see if the token after the first
7517 // identifier is a "," or ")". Only then do we parse it as an
7518 // identifier list.
7519 && (!Tok.is(K: tok::eof) &&
7520 (NextToken().is(K: tok::comma) || NextToken().is(K: tok::r_paren)));
7521}
7522
7523void Parser::ParseFunctionDeclaratorIdentifierList(
7524 Declarator &D,
7525 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo) {
7526 // We should never reach this point in C23 or C++.
7527 assert(!getLangOpts().requiresStrictPrototypes() &&
7528 "Cannot parse an identifier list in C23 or C++");
7529
7530 // If there was no identifier specified for the declarator, either we are in
7531 // an abstract-declarator, or we are in a parameter declarator which was found
7532 // to be abstract. In abstract-declarators, identifier lists are not valid:
7533 // diagnose this.
7534 if (!D.getIdentifier())
7535 Diag(Tok, DiagID: diag::ext_ident_list_in_param);
7536
7537 // Maintain an efficient lookup of params we have seen so far.
7538 llvm::SmallPtrSet<const IdentifierInfo *, 16> ParamsSoFar;
7539
7540 do {
7541 // If this isn't an identifier, report the error and skip until ')'.
7542 if (Tok.isNot(K: tok::identifier)) {
7543 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
7544 SkipUntil(T: tok::r_paren, Flags: StopAtSemi | StopBeforeMatch);
7545 // Forget we parsed anything.
7546 ParamInfo.clear();
7547 return;
7548 }
7549
7550 IdentifierInfo *ParmII = Tok.getIdentifierInfo();
7551
7552 // Reject 'typedef int y; int test(x, y)', but continue parsing.
7553 if (Actions.getTypeName(II: *ParmII, NameLoc: Tok.getLocation(), S: getCurScope()))
7554 Diag(Tok, DiagID: diag::err_unexpected_typedef_ident) << ParmII;
7555
7556 // Verify that the argument identifier has not already been mentioned.
7557 if (!ParamsSoFar.insert(Ptr: ParmII).second) {
7558 Diag(Tok, DiagID: diag::err_param_redefinition) << ParmII;
7559 } else {
7560 // Remember this identifier in ParamInfo.
7561 ParamInfo.push_back(Elt: DeclaratorChunk::ParamInfo(ParmII,
7562 Tok.getLocation(),
7563 nullptr));
7564 }
7565
7566 // Eat the identifier.
7567 ConsumeToken();
7568 // The list continues if we see a comma.
7569 } while (TryConsumeToken(Expected: tok::comma));
7570}
7571
7572void Parser::ParseParameterDeclarationClause(
7573 DeclaratorContext DeclaratorCtx, ParsedAttributes &FirstArgAttrs,
7574 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo,
7575 SourceLocation &EllipsisLoc, bool IsACXXFunctionDeclaration) {
7576
7577 // Avoid exceeding the maximum function scope depth.
7578 // See https://bugs.llvm.org/show_bug.cgi?id=19607
7579 // Note Sema::ActOnParamDeclarator calls ParmVarDecl::setScopeInfo with
7580 // getFunctionPrototypeDepth() - 1.
7581 if (getCurScope()->getFunctionPrototypeDepth() - 1 >
7582 ParmVarDecl::getMaxFunctionScopeDepth()) {
7583 Diag(Loc: Tok.getLocation(), DiagID: diag::err_function_scope_depth_exceeded)
7584 << ParmVarDecl::getMaxFunctionScopeDepth();
7585 cutOffParsing();
7586 return;
7587 }
7588
7589 // C++2a [temp.res]p5
7590 // A qualified-id is assumed to name a type if
7591 // - [...]
7592 // - it is a decl-specifier of the decl-specifier-seq of a
7593 // - [...]
7594 // - parameter-declaration in a member-declaration [...]
7595 // - parameter-declaration in a declarator of a function or function
7596 // template declaration whose declarator-id is qualified [...]
7597 // - parameter-declaration in a lambda-declarator [...]
7598 auto AllowImplicitTypename = ImplicitTypenameContext::No;
7599 if (DeclaratorCtx == DeclaratorContext::Member ||
7600 DeclaratorCtx == DeclaratorContext::LambdaExpr ||
7601 DeclaratorCtx == DeclaratorContext::RequiresExpr ||
7602 IsACXXFunctionDeclaration) {
7603 AllowImplicitTypename = ImplicitTypenameContext::Yes;
7604 }
7605
7606 do {
7607 // FIXME: Issue a diagnostic if we parsed an attribute-specifier-seq
7608 // before deciding this was a parameter-declaration-clause.
7609 if (TryConsumeToken(Expected: tok::ellipsis, Loc&: EllipsisLoc))
7610 break;
7611
7612 // Parse the declaration-specifiers.
7613 // Just use the ParsingDeclaration "scope" of the declarator.
7614 DeclSpec DS(AttrFactory);
7615
7616 ParsedAttributes ArgDeclAttrs(AttrFactory);
7617 ParsedAttributes ArgDeclSpecAttrs(AttrFactory);
7618
7619 if (FirstArgAttrs.Range.isValid()) {
7620 // If the caller parsed attributes for the first argument, add them now.
7621 // Take them so that we only apply the attributes to the first parameter.
7622 // We have already started parsing the decl-specifier sequence, so don't
7623 // parse any parameter-declaration pieces that precede it.
7624 ArgDeclSpecAttrs.takeAllPrependingFrom(Other&: FirstArgAttrs);
7625 } else {
7626 // Parse any C++11 attributes.
7627 MaybeParseCXX11Attributes(Attrs&: ArgDeclAttrs);
7628
7629 // Skip any Microsoft attributes before a param.
7630 MaybeParseMicrosoftAttributes(Attrs&: ArgDeclSpecAttrs);
7631 }
7632
7633 SourceLocation DSStart = Tok.getLocation();
7634
7635 // Parse a C++23 Explicit Object Parameter
7636 // We do that in all language modes to produce a better diagnostic.
7637 SourceLocation ThisLoc;
7638 if (getLangOpts().CPlusPlus && Tok.is(K: tok::kw_this))
7639 ThisLoc = ConsumeToken();
7640
7641 ParsedTemplateInfo TemplateInfo;
7642 ParseDeclarationSpecifiers(DS, TemplateInfo, AS: AS_none,
7643 DSContext: DeclSpecContext::DSC_normal,
7644 /*LateAttrs=*/nullptr, AllowImplicitTypename);
7645
7646 DS.takeAttributesAppendingingFrom(attrs&: ArgDeclSpecAttrs);
7647
7648 // Parse the declarator. This is "PrototypeContext" or
7649 // "LambdaExprParameterContext", because we must accept either
7650 // 'declarator' or 'abstract-declarator' here.
7651 Declarator ParmDeclarator(DS, ArgDeclAttrs,
7652 DeclaratorCtx == DeclaratorContext::RequiresExpr
7653 ? DeclaratorContext::RequiresExpr
7654 : DeclaratorCtx == DeclaratorContext::LambdaExpr
7655 ? DeclaratorContext::LambdaExprParameter
7656 : DeclaratorContext::Prototype);
7657 ParseDeclarator(D&: ParmDeclarator);
7658
7659 if (ThisLoc.isValid())
7660 ParmDeclarator.SetRangeBegin(ThisLoc);
7661
7662 // Parse GNU attributes, if present.
7663 MaybeParseGNUAttributes(D&: ParmDeclarator);
7664 if (getLangOpts().HLSL)
7665 MaybeParseHLSLAnnotations(Attrs&: DS.getAttributes());
7666
7667 if (Tok.is(K: tok::kw_requires)) {
7668 // User tried to define a requires clause in a parameter declaration,
7669 // which is surely not a function declaration.
7670 // void f(int (*g)(int, int) requires true);
7671 Diag(Tok,
7672 DiagID: diag::err_requires_clause_on_declarator_not_declaring_a_function);
7673 ConsumeToken();
7674 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true);
7675 }
7676
7677 // Remember this parsed parameter in ParamInfo.
7678 const IdentifierInfo *ParmII = ParmDeclarator.getIdentifier();
7679
7680 // DefArgToks is used when the parsing of default arguments needs
7681 // to be delayed.
7682 std::unique_ptr<CachedTokens> DefArgToks;
7683
7684 // If no parameter was specified, verify that *something* was specified,
7685 // otherwise we have a missing type and identifier.
7686 if (DS.isEmpty() && ParmDeclarator.getIdentifier() == nullptr &&
7687 ParmDeclarator.getNumTypeObjects() == 0) {
7688 // Completely missing, emit error.
7689 Diag(Loc: DSStart, DiagID: diag::err_missing_param);
7690 } else {
7691 // Otherwise, we have something. Add it and let semantic analysis try
7692 // to grok it and add the result to the ParamInfo we are building.
7693
7694 // Last chance to recover from a misplaced ellipsis in an attempted
7695 // parameter pack declaration.
7696 if (Tok.is(K: tok::ellipsis) &&
7697 (NextToken().isNot(K: tok::r_paren) ||
7698 (!ParmDeclarator.getEllipsisLoc().isValid() &&
7699 !Actions.isUnexpandedParameterPackPermitted())) &&
7700 Actions.containsUnexpandedParameterPacks(D&: ParmDeclarator))
7701 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc: ConsumeToken(), D&: ParmDeclarator);
7702
7703 // Now we are at the point where declarator parsing is finished.
7704 //
7705 // Try to catch keywords in place of the identifier in a declarator, and
7706 // in particular the common case where:
7707 // 1 identifier comes at the end of the declarator
7708 // 2 if the identifier is dropped, the declarator is valid but anonymous
7709 // (no identifier)
7710 // 3 declarator parsing succeeds, and then we have a trailing keyword,
7711 // which is never valid in a param list (e.g. missing a ',')
7712 // And we can't handle this in ParseDeclarator because in general keywords
7713 // may be allowed to follow the declarator. (And in some cases there'd be
7714 // better recovery like inserting punctuation). ParseDeclarator is just
7715 // treating this as an anonymous parameter, and fortunately at this point
7716 // we've already almost done that.
7717 //
7718 // We care about case 1) where the declarator type should be known, and
7719 // the identifier should be null.
7720 if (!ParmDeclarator.isInvalidType() && !ParmDeclarator.hasName() &&
7721 Tok.isNot(K: tok::raw_identifier) && !Tok.isAnnotation() &&
7722 Tok.getIdentifierInfo() &&
7723 Tok.getIdentifierInfo()->isKeyword(LangOpts: getLangOpts())) {
7724 Diag(Tok, DiagID: diag::err_keyword_as_parameter) << PP.getSpelling(Tok);
7725 // Consume the keyword.
7726 ConsumeToken();
7727 }
7728
7729 // We can only store so many parameters
7730 // Skip until the the end of the parameter list, ignoring
7731 // parameters that would overflow.
7732 if (ParamInfo.size() == Type::FunctionTypeNumParamsLimit) {
7733 Diag(Loc: ParmDeclarator.getBeginLoc(),
7734 DiagID: diag::err_function_parameter_limit_exceeded);
7735 SkipUntil(T: tok::r_paren, Flags: SkipUntilFlags::StopBeforeMatch);
7736 break;
7737 }
7738
7739 // Inform the actions module about the parameter declarator, so it gets
7740 // added to the current scope.
7741 Decl *Param =
7742 Actions.ActOnParamDeclarator(S: getCurScope(), D&: ParmDeclarator, ExplicitThisLoc: ThisLoc);
7743 // Parse the default argument, if any. We parse the default
7744 // arguments in all dialects; the semantic analysis in
7745 // ActOnParamDefaultArgument will reject the default argument in
7746 // C.
7747 if (Tok.is(K: tok::equal)) {
7748 SourceLocation EqualLoc = Tok.getLocation();
7749
7750 // Parse the default argument
7751 if (DeclaratorCtx == DeclaratorContext::Member) {
7752 // If we're inside a class definition, cache the tokens
7753 // corresponding to the default argument. We'll actually parse
7754 // them when we see the end of the class definition.
7755 DefArgToks.reset(p: new CachedTokens);
7756
7757 SourceLocation ArgStartLoc = NextToken().getLocation();
7758 ConsumeAndStoreInitializer(Toks&: *DefArgToks,
7759 CIK: CachedInitKind::DefaultArgument);
7760 Actions.ActOnParamUnparsedDefaultArgument(param: Param, EqualLoc,
7761 ArgLoc: ArgStartLoc);
7762 } else {
7763 // Consume the '='.
7764 ConsumeToken();
7765
7766 // The default argument may contain a lambda whose body triggers
7767 // MaybeDestroyTemplateIds at the end of the inner statements; avoid
7768 // destroying parsed template-ids that may still be referenced by
7769 // the enclosing declarator (e.g. a template-id in the function
7770 // name or other parameters).
7771 DelayTemplateIdDestructionRAII DontDestructTemplateIds(
7772 *this, /*DelayTemplateIdDestruction=*/true);
7773
7774 // The argument isn't actually potentially evaluated unless it is
7775 // used.
7776 EnterExpressionEvaluationContext Eval(
7777 Actions,
7778 Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed,
7779 Param);
7780
7781 ExprResult DefArgResult;
7782 if (getLangOpts().CPlusPlus11 && Tok.is(K: tok::l_brace)) {
7783 Diag(Tok, DiagID: diag::warn_cxx98_compat_generalized_initializer_lists);
7784 DefArgResult = ParseBraceInitializer();
7785 } else {
7786 if (Tok.is(K: tok::l_paren) && NextToken().is(K: tok::l_brace)) {
7787 Diag(Tok, DiagID: diag::err_stmt_expr_in_default_arg) << 0;
7788 Actions.ActOnParamDefaultArgumentError(param: Param, EqualLoc,
7789 /*DefaultArg=*/nullptr);
7790 // Skip the statement expression and continue parsing
7791 SkipUntil(T: tok::comma, Flags: StopBeforeMatch);
7792 DefArgResult = ExprError();
7793 } else {
7794 DefArgResult = ParseAssignmentExpression();
7795 }
7796 }
7797 if (DefArgResult.isInvalid()) {
7798 Actions.ActOnParamDefaultArgumentError(param: Param, EqualLoc,
7799 /*DefaultArg=*/nullptr);
7800 SkipUntil(T1: tok::comma, T2: tok::r_paren, Flags: StopAtSemi | StopBeforeMatch);
7801 } else {
7802 // Inform the actions module about the default argument
7803 Actions.ActOnParamDefaultArgument(param: Param, EqualLoc,
7804 defarg: DefArgResult.get());
7805 }
7806 }
7807 }
7808
7809 ParamInfo.push_back(Elt: DeclaratorChunk::ParamInfo(ParmII,
7810 ParmDeclarator.getIdentifierLoc(),
7811 Param, std::move(DefArgToks)));
7812 }
7813
7814 if (TryConsumeToken(Expected: tok::ellipsis, Loc&: EllipsisLoc)) {
7815 if (getLangOpts().CPlusPlus26) {
7816 // C++26 [dcl.dcl.fct]p3:
7817 // A parameter-declaration-clause of the form
7818 // parameter-list '...' is deprecated.
7819 Diag(Loc: EllipsisLoc, DiagID: diag::warn_deprecated_missing_comma_before_ellipsis)
7820 << FixItHint::CreateInsertion(InsertionLoc: EllipsisLoc, Code: ", ");
7821 }
7822
7823 if (!getLangOpts().CPlusPlus) {
7824 // We have ellipsis without a preceding ',', which is ill-formed
7825 // in C. Complain and provide the fix.
7826 Diag(Loc: EllipsisLoc, DiagID: diag::err_missing_comma_before_ellipsis)
7827 << FixItHint::CreateInsertion(InsertionLoc: EllipsisLoc, Code: ", ");
7828 } else if (ParmDeclarator.getEllipsisLoc().isValid() ||
7829 Actions.containsUnexpandedParameterPacks(D&: ParmDeclarator)) {
7830 // It looks like this was supposed to be a parameter pack. Warn and
7831 // point out where the ellipsis should have gone.
7832 SourceLocation ParmEllipsis = ParmDeclarator.getEllipsisLoc();
7833 Diag(Loc: EllipsisLoc, DiagID: diag::warn_misplaced_ellipsis_vararg)
7834 << ParmEllipsis.isValid() << ParmEllipsis;
7835 if (ParmEllipsis.isValid()) {
7836 Diag(Loc: ParmEllipsis,
7837 DiagID: diag::note_misplaced_ellipsis_vararg_existing_ellipsis);
7838 } else {
7839 Diag(Loc: ParmDeclarator.getIdentifierLoc(),
7840 DiagID: diag::note_misplaced_ellipsis_vararg_add_ellipsis)
7841 << FixItHint::CreateInsertion(InsertionLoc: ParmDeclarator.getIdentifierLoc(),
7842 Code: "...")
7843 << !ParmDeclarator.hasName();
7844 }
7845 Diag(Loc: EllipsisLoc, DiagID: diag::note_misplaced_ellipsis_vararg_add_comma)
7846 << FixItHint::CreateInsertion(InsertionLoc: EllipsisLoc, Code: ", ");
7847 }
7848
7849 // We can't have any more parameters after an ellipsis.
7850 break;
7851 }
7852
7853 // If the next token is a comma, consume it and keep reading arguments.
7854 } while (TryConsumeToken(Expected: tok::comma));
7855}
7856
7857void Parser::ParseBracketDeclarator(Declarator &D) {
7858 if (CheckProhibitedCXX11Attribute())
7859 return;
7860
7861 BalancedDelimiterTracker T(*this, tok::l_square);
7862 T.consumeOpen();
7863
7864 // C array syntax has many features, but by-far the most common is [] and [4].
7865 // This code does a fast path to handle some of the most obvious cases.
7866 if (Tok.getKind() == tok::r_square) {
7867 T.consumeClose();
7868 ParsedAttributes attrs(AttrFactory);
7869 MaybeParseCXX11Attributes(Attrs&: attrs);
7870
7871 // Remember that we parsed the empty array type.
7872 D.AddTypeInfo(TI: DeclaratorChunk::getArray(TypeQuals: 0, isStatic: false, isStar: false, NumElts: nullptr,
7873 LBLoc: T.getOpenLocation(),
7874 RBLoc: T.getCloseLocation()),
7875 attrs: std::move(attrs), EndLoc: T.getCloseLocation());
7876 return;
7877 } else if (Tok.getKind() == tok::numeric_constant &&
7878 GetLookAheadToken(N: 1).is(K: tok::r_square)) {
7879 // [4] is very common. Parse the numeric constant expression.
7880 ExprResult ExprRes(Actions.ActOnNumericConstant(Tok, UDLScope: getCurScope()));
7881 ConsumeToken();
7882
7883 T.consumeClose();
7884 ParsedAttributes attrs(AttrFactory);
7885 MaybeParseCXX11Attributes(Attrs&: attrs);
7886
7887 // Remember that we parsed a array type, and remember its features.
7888 D.AddTypeInfo(TI: DeclaratorChunk::getArray(TypeQuals: 0, isStatic: false, isStar: false, NumElts: ExprRes.get(),
7889 LBLoc: T.getOpenLocation(),
7890 RBLoc: T.getCloseLocation()),
7891 attrs: std::move(attrs), EndLoc: T.getCloseLocation());
7892 return;
7893 } else if (Tok.getKind() == tok::code_completion) {
7894 cutOffParsing();
7895 Actions.CodeCompletion().CodeCompleteBracketDeclarator(S: getCurScope());
7896 return;
7897 }
7898
7899 // If valid, this location is the position where we read the 'static' keyword.
7900 SourceLocation StaticLoc;
7901 TryConsumeToken(Expected: tok::kw_static, Loc&: StaticLoc);
7902
7903 // If there is a type-qualifier-list, read it now.
7904 // Type qualifiers in an array subscript are a C99 feature.
7905 DeclSpec DS(AttrFactory);
7906 ParseTypeQualifierListOpt(DS, AttrReqs: AR_CXX11AttributesParsed);
7907
7908 // If we haven't already read 'static', check to see if there is one after the
7909 // type-qualifier-list.
7910 if (!StaticLoc.isValid())
7911 TryConsumeToken(Expected: tok::kw_static, Loc&: StaticLoc);
7912
7913 // Handle "direct-declarator [ type-qual-list[opt] * ]".
7914 bool isStar = false;
7915 ExprResult NumElements;
7916
7917 // Handle the case where we have '[*]' as the array size. However, a leading
7918 // star could be the start of an expression, for example 'X[*p + 4]'. Verify
7919 // the token after the star is a ']'. Since stars in arrays are
7920 // infrequent, use of lookahead is not costly here.
7921 if (Tok.is(K: tok::star) && GetLookAheadToken(N: 1).is(K: tok::r_square)) {
7922 ConsumeToken(); // Eat the '*'.
7923
7924 if (StaticLoc.isValid()) {
7925 Diag(Loc: StaticLoc, DiagID: diag::err_unspecified_vla_size_with_static);
7926 StaticLoc = SourceLocation(); // Drop the static.
7927 }
7928 isStar = true;
7929 } else if (Tok.isNot(K: tok::r_square)) {
7930 // Note, in C89, this production uses the constant-expr production instead
7931 // of assignment-expr. The only difference is that assignment-expr allows
7932 // things like '=' and '*='. Sema rejects these in C89 mode because they
7933 // are not i-c-e's, so we don't need to distinguish between the two here.
7934
7935 // Parse the constant-expression or assignment-expression now (depending
7936 // on dialect).
7937 if (getLangOpts().CPlusPlus) {
7938 NumElements = ParseArrayBoundExpression();
7939 } else {
7940 EnterExpressionEvaluationContext Unevaluated(
7941 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
7942 NumElements = ParseAssignmentExpression();
7943 }
7944 } else {
7945 if (StaticLoc.isValid()) {
7946 Diag(Loc: StaticLoc, DiagID: diag::err_unspecified_size_with_static);
7947 StaticLoc = SourceLocation(); // Drop the static.
7948 }
7949 }
7950
7951 // If there was an error parsing the assignment-expression, recover.
7952 if (NumElements.isInvalid()) {
7953 D.setInvalidType(true);
7954 // If the expression was invalid, skip it.
7955 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
7956 return;
7957 }
7958
7959 T.consumeClose();
7960
7961 MaybeParseCXX11Attributes(Attrs&: DS.getAttributes());
7962
7963 // Remember that we parsed a array type, and remember its features.
7964 D.AddTypeInfo(
7965 TI: DeclaratorChunk::getArray(TypeQuals: DS.getTypeQualifiers(), isStatic: StaticLoc.isValid(),
7966 isStar, NumElts: NumElements.get(), LBLoc: T.getOpenLocation(),
7967 RBLoc: T.getCloseLocation()),
7968 attrs: std::move(DS.getAttributes()), EndLoc: T.getCloseLocation());
7969}
7970
7971void Parser::ParseMisplacedBracketDeclarator(Declarator &D) {
7972 assert(Tok.is(tok::l_square) && "Missing opening bracket");
7973 assert(!D.mayOmitIdentifier() && "Declarator cannot omit identifier");
7974
7975 SourceLocation StartBracketLoc = Tok.getLocation();
7976 Declarator TempDeclarator(D.getDeclSpec(), ParsedAttributesView::none(),
7977 D.getContext());
7978
7979 while (Tok.is(K: tok::l_square)) {
7980 ParseBracketDeclarator(D&: TempDeclarator);
7981 }
7982
7983 // Stuff the location of the start of the brackets into the Declarator.
7984 // The diagnostics from ParseDirectDeclarator will make more sense if
7985 // they use this location instead.
7986 if (Tok.is(K: tok::semi))
7987 D.getName().EndLocation = StartBracketLoc;
7988
7989 SourceLocation SuggestParenLoc = Tok.getLocation();
7990
7991 // Now that the brackets are removed, try parsing the declarator again.
7992 ParseDeclaratorInternal(D, DirectDeclParser: &Parser::ParseDirectDeclarator);
7993
7994 // Something went wrong parsing the brackets, in which case,
7995 // ParseBracketDeclarator has emitted an error, and we don't need to emit
7996 // one here.
7997 if (TempDeclarator.getNumTypeObjects() == 0)
7998 return;
7999
8000 // Determine if parens will need to be suggested in the diagnostic.
8001 bool NeedParens = false;
8002 if (D.getNumTypeObjects() != 0) {
8003 switch (D.getTypeObject(i: D.getNumTypeObjects() - 1).Kind) {
8004 case DeclaratorChunk::Pointer:
8005 case DeclaratorChunk::Reference:
8006 case DeclaratorChunk::BlockPointer:
8007 case DeclaratorChunk::MemberPointer:
8008 case DeclaratorChunk::Pipe:
8009 NeedParens = true;
8010 break;
8011 case DeclaratorChunk::Array:
8012 case DeclaratorChunk::Function:
8013 case DeclaratorChunk::Paren:
8014 break;
8015 }
8016 }
8017
8018 if (NeedParens) {
8019 // Create a DeclaratorChunk for the inserted parens.
8020 SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: D.getEndLoc());
8021 D.AddTypeInfo(TI: DeclaratorChunk::getParen(LParenLoc: SuggestParenLoc, RParenLoc: EndLoc),
8022 EndLoc: SourceLocation());
8023 }
8024
8025 // Adding back the bracket info to the end of the Declarator.
8026 for (unsigned i = 0, e = TempDeclarator.getNumTypeObjects(); i < e; ++i) {
8027 const DeclaratorChunk &Chunk = TempDeclarator.getTypeObject(i);
8028 D.AddTypeInfo(TI: Chunk, OtherPool&: TempDeclarator.getAttributePool(), EndLoc: SourceLocation());
8029 }
8030
8031 // The missing name would have been diagnosed in ParseDirectDeclarator.
8032 // If parentheses are required, always suggest them.
8033 if (!D.hasName() && !NeedParens)
8034 return;
8035
8036 SourceLocation EndBracketLoc = TempDeclarator.getEndLoc();
8037
8038 // Generate the move bracket error message.
8039 SourceRange BracketRange(StartBracketLoc, EndBracketLoc);
8040 SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: D.getEndLoc());
8041
8042 if (NeedParens) {
8043 Diag(Loc: EndLoc, DiagID: diag::err_brackets_go_after_unqualified_id)
8044 << getLangOpts().CPlusPlus
8045 << FixItHint::CreateInsertion(InsertionLoc: SuggestParenLoc, Code: "(")
8046 << FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: ")")
8047 << FixItHint::CreateInsertionFromRange(
8048 InsertionLoc: EndLoc, FromRange: CharSourceRange(BracketRange, true))
8049 << FixItHint::CreateRemoval(RemoveRange: BracketRange);
8050 } else {
8051 Diag(Loc: EndLoc, DiagID: diag::err_brackets_go_after_unqualified_id)
8052 << getLangOpts().CPlusPlus
8053 << FixItHint::CreateInsertionFromRange(
8054 InsertionLoc: EndLoc, FromRange: CharSourceRange(BracketRange, true))
8055 << FixItHint::CreateRemoval(RemoveRange: BracketRange);
8056 }
8057}
8058
8059void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
8060 assert(Tok.isOneOf(tok::kw_typeof, tok::kw_typeof_unqual) &&
8061 "Not a typeof specifier");
8062
8063 bool IsUnqual = Tok.is(K: tok::kw_typeof_unqual);
8064 const IdentifierInfo *II = Tok.getIdentifierInfo();
8065 if (getLangOpts().C23 && !II->getName().starts_with(Prefix: "__"))
8066 Diag(Loc: Tok.getLocation(), DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
8067
8068 Token OpTok = Tok;
8069 SourceLocation StartLoc = ConsumeToken();
8070 bool HasParens = Tok.is(K: tok::l_paren);
8071
8072 EnterExpressionEvaluationContext Unevaluated(
8073 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
8074 Sema::ReuseLambdaContextDecl);
8075
8076 bool isCastExpr;
8077 ParsedType CastTy;
8078 SourceRange CastRange;
8079 ExprResult Operand =
8080 ParseExprAfterUnaryExprOrTypeTrait(OpTok, isCastExpr, CastTy, CastRange);
8081 if (HasParens)
8082 DS.setTypeArgumentRange(CastRange);
8083
8084 if (CastRange.getEnd().isInvalid())
8085 // FIXME: Not accurate, the range gets one token more than it should.
8086 DS.SetRangeEnd(Tok.getLocation());
8087 else
8088 DS.SetRangeEnd(CastRange.getEnd());
8089
8090 if (isCastExpr) {
8091 if (!CastTy) {
8092 DS.SetTypeSpecError();
8093 return;
8094 }
8095
8096 const char *PrevSpec = nullptr;
8097 unsigned DiagID;
8098 // Check for duplicate type specifiers (e.g. "int typeof(int)").
8099 if (DS.SetTypeSpecType(T: IsUnqual ? DeclSpec::TST_typeof_unqualType
8100 : DeclSpec::TST_typeofType,
8101 Loc: StartLoc, PrevSpec,
8102 DiagID, Rep: CastTy,
8103 Policy: Actions.getASTContext().getPrintingPolicy()))
8104 Diag(Loc: StartLoc, DiagID) << PrevSpec;
8105 return;
8106 }
8107
8108 // If we get here, the operand to the typeof was an expression.
8109 if (Operand.isInvalid()) {
8110 DS.SetTypeSpecError();
8111 return;
8112 }
8113
8114 // We might need to transform the operand if it is potentially evaluated.
8115 Operand = Actions.HandleExprEvaluationContextForTypeof(E: Operand.get());
8116 if (Operand.isInvalid()) {
8117 DS.SetTypeSpecError();
8118 return;
8119 }
8120
8121 const char *PrevSpec = nullptr;
8122 unsigned DiagID;
8123 // Check for duplicate type specifiers (e.g. "int typeof(int)").
8124 if (DS.SetTypeSpecType(T: IsUnqual ? DeclSpec::TST_typeof_unqualExpr
8125 : DeclSpec::TST_typeofExpr,
8126 Loc: StartLoc, PrevSpec,
8127 DiagID, Rep: Operand.get(),
8128 policy: Actions.getASTContext().getPrintingPolicy()))
8129 Diag(Loc: StartLoc, DiagID) << PrevSpec;
8130}
8131
8132void Parser::ParseAtomicSpecifier(DeclSpec &DS) {
8133 assert(Tok.is(tok::kw__Atomic) && NextToken().is(tok::l_paren) &&
8134 "Not an atomic specifier");
8135
8136 SourceLocation StartLoc = ConsumeToken();
8137 BalancedDelimiterTracker T(*this, tok::l_paren);
8138 if (T.consumeOpen())
8139 return;
8140
8141 TypeResult Result = ParseTypeName();
8142 if (Result.isInvalid()) {
8143 SkipUntil(T: tok::r_paren, Flags: StopAtSemi);
8144 return;
8145 }
8146
8147 // Match the ')'
8148 T.consumeClose();
8149
8150 if (T.getCloseLocation().isInvalid())
8151 return;
8152
8153 DS.setTypeArgumentRange(T.getRange());
8154 DS.SetRangeEnd(T.getCloseLocation());
8155
8156 const char *PrevSpec = nullptr;
8157 unsigned DiagID;
8158 if (DS.SetTypeSpecType(T: DeclSpec::TST_atomic, Loc: StartLoc, PrevSpec,
8159 DiagID, Rep: Result.get(),
8160 Policy: Actions.getASTContext().getPrintingPolicy()))
8161 Diag(Loc: StartLoc, DiagID) << PrevSpec;
8162}
8163
8164bool Parser::TryAltiVecVectorTokenOutOfLine() {
8165 Token Next = NextToken();
8166 switch (Next.getKind()) {
8167 default: return false;
8168 case tok::kw_short:
8169 case tok::kw_long:
8170 case tok::kw_signed:
8171 case tok::kw_unsigned:
8172 case tok::kw_void:
8173 case tok::kw_char:
8174 case tok::kw_int:
8175 case tok::kw_float:
8176 case tok::kw_double:
8177 case tok::kw_bool:
8178 case tok::kw__Bool:
8179 case tok::kw___bool:
8180 case tok::kw___pixel:
8181 Tok.setKind(tok::kw___vector);
8182 return true;
8183 case tok::identifier:
8184 if (Next.getIdentifierInfo() == Ident_pixel) {
8185 Tok.setKind(tok::kw___vector);
8186 return true;
8187 }
8188 if (Next.getIdentifierInfo() == Ident_bool ||
8189 Next.getIdentifierInfo() == Ident_Bool) {
8190 Tok.setKind(tok::kw___vector);
8191 return true;
8192 }
8193 return false;
8194 }
8195}
8196
8197bool Parser::TryAltiVecTokenOutOfLine(DeclSpec &DS, SourceLocation Loc,
8198 const char *&PrevSpec, unsigned &DiagID,
8199 bool &isInvalid) {
8200 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
8201 if (Tok.getIdentifierInfo() == Ident_vector) {
8202 Token Next = NextToken();
8203 switch (Next.getKind()) {
8204 case tok::kw_short:
8205 case tok::kw_long:
8206 case tok::kw_signed:
8207 case tok::kw_unsigned:
8208 case tok::kw_void:
8209 case tok::kw_char:
8210 case tok::kw_int:
8211 case tok::kw_float:
8212 case tok::kw_double:
8213 case tok::kw_bool:
8214 case tok::kw__Bool:
8215 case tok::kw___bool:
8216 case tok::kw___pixel:
8217 isInvalid = DS.SetTypeAltiVecVector(isAltiVecVector: true, Loc, PrevSpec, DiagID, Policy);
8218 return true;
8219 case tok::identifier:
8220 if (Next.getIdentifierInfo() == Ident_pixel) {
8221 isInvalid = DS.SetTypeAltiVecVector(isAltiVecVector: true, Loc, PrevSpec, DiagID,Policy);
8222 return true;
8223 }
8224 if (Next.getIdentifierInfo() == Ident_bool ||
8225 Next.getIdentifierInfo() == Ident_Bool) {
8226 isInvalid =
8227 DS.SetTypeAltiVecVector(isAltiVecVector: true, Loc, PrevSpec, DiagID, Policy);
8228 return true;
8229 }
8230 break;
8231 default:
8232 break;
8233 }
8234 } else if ((Tok.getIdentifierInfo() == Ident_pixel) &&
8235 DS.isTypeAltiVecVector()) {
8236 isInvalid = DS.SetTypeAltiVecPixel(isAltiVecPixel: true, Loc, PrevSpec, DiagID, Policy);
8237 return true;
8238 } else if ((Tok.getIdentifierInfo() == Ident_bool) &&
8239 DS.isTypeAltiVecVector()) {
8240 isInvalid = DS.SetTypeAltiVecBool(isAltiVecBool: true, Loc, PrevSpec, DiagID, Policy);
8241 return true;
8242 }
8243 return false;
8244}
8245
8246TypeResult Parser::ParseTypeFromString(StringRef TypeStr, StringRef Context,
8247 SourceLocation IncludeLoc) {
8248 // Consume (unexpanded) tokens up to the end-of-directive.
8249 SmallVector<Token, 4> Tokens;
8250 {
8251 // Create a new buffer from which we will parse the type.
8252 auto &SourceMgr = PP.getSourceManager();
8253 FileID FID = SourceMgr.createFileID(
8254 Buffer: llvm::MemoryBuffer::getMemBufferCopy(InputData: TypeStr, BufferName: Context), FileCharacter: SrcMgr::C_User,
8255 LoadedID: 0, LoadedOffset: 0, IncludeLoc);
8256
8257 // Form a new lexer that references the buffer.
8258 Lexer L(FID, SourceMgr.getBufferOrFake(FID), PP);
8259 L.setParsingPreprocessorDirective(true);
8260
8261 // Lex the tokens from that buffer.
8262 Token Tok;
8263 do {
8264 L.Lex(Result&: Tok);
8265 Tokens.push_back(Elt: Tok);
8266 } while (Tok.isNot(K: tok::eod));
8267 }
8268
8269 // Replace the "eod" token with an "eof" token identifying the end of
8270 // the provided string.
8271 Token &EndToken = Tokens.back();
8272 EndToken.startToken();
8273 EndToken.setKind(tok::eof);
8274 EndToken.setLocation(Tok.getLocation());
8275 EndToken.setEofData(TypeStr.data());
8276
8277 // Add the current token back.
8278 Tokens.push_back(Elt: Tok);
8279
8280 // Enter the tokens into the token stream.
8281 PP.EnterTokenStream(Toks: Tokens, /*DisableMacroExpansion=*/false,
8282 /*IsReinject=*/false);
8283
8284 // Consume the current token so that we'll start parsing the tokens we
8285 // added to the stream.
8286 ConsumeAnyToken();
8287
8288 // Enter a new scope.
8289 ParseScope LocalScope(this, 0);
8290
8291 // Parse the type.
8292 TypeResult Result = ParseTypeName(Range: nullptr);
8293
8294 // Check if we parsed the whole thing.
8295 if (Result.isUsable() &&
8296 (Tok.isNot(K: tok::eof) || Tok.getEofData() != TypeStr.data())) {
8297 Diag(Loc: Tok.getLocation(), DiagID: diag::err_type_unparsed);
8298 }
8299
8300 // There could be leftover tokens (e.g. because of an error).
8301 // Skip through until we reach the 'end of directive' token.
8302 while (Tok.isNot(K: tok::eof))
8303 ConsumeAnyToken();
8304
8305 // Consume the end token.
8306 if (Tok.is(K: tok::eof) && Tok.getEofData() == TypeStr.data())
8307 ConsumeAnyToken();
8308 return Result;
8309}
8310
8311void Parser::DiagnoseBitIntUse(const Token &Tok) {
8312 // If the token is for _ExtInt, diagnose it as being deprecated. Otherwise,
8313 // the token is about _BitInt and gets (potentially) diagnosed as use of an
8314 // extension.
8315 assert(Tok.isOneOf(tok::kw__ExtInt, tok::kw__BitInt) &&
8316 "expected either an _ExtInt or _BitInt token!");
8317
8318 SourceLocation Loc = Tok.getLocation();
8319 if (Tok.is(K: tok::kw__ExtInt)) {
8320 Diag(Loc, DiagID: diag::warn_ext_int_deprecated)
8321 << FixItHint::CreateReplacement(RemoveRange: Loc, Code: "_BitInt");
8322 } else {
8323 // In C23 mode, diagnose that the use is not compatible with pre-C23 modes.
8324 // Otherwise, diagnose that the use is a Clang extension.
8325 if (getLangOpts().C23)
8326 Diag(Loc, DiagID: diag::warn_c23_compat_keyword) << Tok.getName();
8327 else
8328 Diag(Loc, DiagID: diag::ext_bit_int) << getLangOpts().CPlusPlus;
8329 }
8330}
8331