1//===--- Parser.cpp - C Language Family Parser ----------------------------===//
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 Parser interfaces.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Parse/Parser.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTLambda.h"
17#include "clang/AST/DeclTemplate.h"
18#include "clang/Basic/DiagnosticParse.h"
19#include "clang/Basic/StackExhaustionHandler.h"
20#include "clang/Basic/TokenKinds.h"
21#include "clang/Lex/ModuleLoader.h"
22#include "clang/Lex/Preprocessor.h"
23#include "clang/Parse/RAIIObjectsForParser.h"
24#include "clang/Sema/DeclSpec.h"
25#include "clang/Sema/EnterExpressionEvaluationContext.h"
26#include "clang/Sema/ParsedTemplate.h"
27#include "clang/Sema/Scope.h"
28#include "clang/Sema/SemaCodeCompletion.h"
29#include "llvm/ADT/STLForwardCompat.h"
30#include "llvm/Support/Path.h"
31#include "llvm/Support/TimeProfiler.h"
32using namespace clang;
33
34
35namespace {
36/// A comment handler that passes comments found by the preprocessor
37/// to the parser action.
38class ActionCommentHandler : public CommentHandler {
39 Sema &S;
40
41public:
42 explicit ActionCommentHandler(Sema &S) : S(S) { }
43
44 bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
45 S.ActOnComment(Comment);
46 return false;
47 }
48};
49} // end anonymous namespace
50
51bool Parser::isTokenSEHExcept() {
52 if (!Tok.is(K: tok::identifier))
53 return false;
54
55 if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
56 Ident__except = PP.getIdentifierInfo(Name: "__except");
57
58 const IdentifierInfo *Identifier = Tok.getIdentifierInfo();
59 if (Identifier == Ident__except)
60 return true;
61
62 if (getLangOpts().MSVCCompat) {
63 if (!Ident_except)
64 Ident_except = PP.getIdentifierInfo(Name: "_except");
65 if (Identifier == Ident_except)
66 return true;
67 }
68
69 return false;
70}
71
72Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
73 : PP(pp),
74 PreferredType(&actions.getASTContext(), pp.isCodeCompletionEnabled()),
75 Actions(actions), Diags(PP.getDiagnostics()), StackHandler(Diags),
76 GreaterThanIsOperator(true), ColonIsSacred(false),
77 ParsingGenericAssociationType(false), InMessageExpression(false),
78 ParsingInObjCContainer(false), TemplateParameterDepth(0) {
79 SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
80 Tok = Token::createEof();
81 Actions.CurScope = nullptr;
82 NumCachedScopes = 0;
83 CurParsedObjCImpl = nullptr;
84
85 // Add #pragma handlers. These are removed and destroyed in the
86 // destructor.
87 initializePragmaHandlers();
88
89 CommentSemaHandler.reset(p: new ActionCommentHandler(actions));
90 PP.addCommentHandler(Handler: CommentSemaHandler.get());
91
92 PP.setCodeCompletionHandler(*this);
93
94 Actions.ParseTypeFromStringCallback =
95 [this](StringRef TypeStr, StringRef Context, SourceLocation IncludeLoc) {
96 return this->ParseTypeFromString(TypeStr, Context, IncludeLoc);
97 };
98}
99
100DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
101 return Diags.Report(Loc, DiagID);
102}
103
104DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
105 return Diag(Loc: Tok.getLocation(), DiagID);
106}
107
108DiagnosticBuilder Parser::DiagCompat(SourceLocation Loc,
109 unsigned CompatDiagId) {
110 return Diag(Loc, DiagID: DiagnosticIDs::getCompatDiagId(LangOpts: getLangOpts(), CompatDiagId));
111}
112
113DiagnosticBuilder Parser::DiagCompat(const Token &Tok, unsigned CompatDiagId) {
114 return DiagCompat(Loc: Tok.getLocation(), CompatDiagId);
115}
116
117void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
118 SourceRange ParenRange) {
119 SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: ParenRange.getEnd());
120 if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
121 // We can't display the parentheses, so just dig the
122 // warning/error and return.
123 Diag(Loc, DiagID: DK);
124 return;
125 }
126
127 Diag(Loc, DiagID: DK)
128 << FixItHint::CreateInsertion(InsertionLoc: ParenRange.getBegin(), Code: "(")
129 << FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: ")");
130}
131
132static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
133 switch (ExpectedTok) {
134 case tok::semi:
135 return Tok.is(K: tok::colon) || Tok.is(K: tok::comma); // : or , for ;
136 default: return false;
137 }
138}
139
140bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
141 StringRef Msg) {
142 if (Tok.is(K: ExpectedTok) || Tok.is(K: tok::code_completion)) {
143 ConsumeAnyToken();
144 return false;
145 }
146
147 // Detect common single-character typos and resume.
148 if (IsCommonTypo(ExpectedTok, Tok)) {
149 SourceLocation Loc = Tok.getLocation();
150 {
151 DiagnosticBuilder DB = Diag(Loc, DiagID);
152 DB << FixItHint::CreateReplacement(
153 RemoveRange: SourceRange(Loc), Code: tok::getPunctuatorSpelling(Kind: ExpectedTok));
154 if (DiagID == diag::err_expected)
155 DB << ExpectedTok;
156 else if (DiagID == diag::err_expected_after)
157 DB << Msg << ExpectedTok;
158 else
159 DB << Msg;
160 }
161
162 // Pretend there wasn't a problem.
163 ConsumeAnyToken();
164 return false;
165 }
166
167 SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: PrevTokLocation);
168 const char *Spelling = nullptr;
169 if (EndLoc.isValid())
170 Spelling = tok::getPunctuatorSpelling(Kind: ExpectedTok);
171
172 DiagnosticBuilder DB =
173 Spelling
174 ? Diag(Loc: EndLoc, DiagID) << FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: Spelling)
175 : Diag(Tok, DiagID);
176 if (DiagID == diag::err_expected)
177 DB << ExpectedTok;
178 else if (DiagID == diag::err_expected_after)
179 DB << Msg << ExpectedTok;
180 else
181 DB << Msg;
182
183 return true;
184}
185
186bool Parser::ExpectAndConsumeSemi(unsigned DiagID, StringRef TokenUsed) {
187 if (TryConsumeToken(Expected: tok::semi))
188 return false;
189
190 if (Tok.is(K: tok::code_completion)) {
191 handleUnexpectedCodeCompletionToken();
192 return false;
193 }
194
195 if ((Tok.is(K: tok::r_paren) || Tok.is(K: tok::r_square)) &&
196 NextToken().is(K: tok::semi)) {
197 Diag(Tok, DiagID: diag::err_extraneous_token_before_semi)
198 << PP.getSpelling(Tok)
199 << FixItHint::CreateRemoval(RemoveRange: Tok.getLocation());
200 ConsumeAnyToken(); // The ')' or ']'.
201 ConsumeToken(); // The ';'.
202 return false;
203 }
204
205 return ExpectAndConsume(ExpectedTok: tok::semi, DiagID , Msg: TokenUsed);
206}
207
208bool Parser::isLikelyAtStartOfNewDeclaration() {
209 return Tok.isAtStartOfLine() &&
210 isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No);
211}
212
213void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, DeclSpec::TST TST) {
214 if (!Tok.is(K: tok::semi)) return;
215
216 bool HadMultipleSemis = false;
217 SourceLocation StartLoc = Tok.getLocation();
218 SourceLocation EndLoc = Tok.getLocation();
219 ConsumeToken();
220
221 while ((Tok.is(K: tok::semi) && !Tok.isAtStartOfLine())) {
222 HadMultipleSemis = true;
223 EndLoc = Tok.getLocation();
224 ConsumeToken();
225 }
226
227 // C++11 allows extra semicolons at namespace scope, but not in any of the
228 // other contexts.
229 if (Kind == ExtraSemiKind::OutsideFunction && getLangOpts().CPlusPlus) {
230 if (getLangOpts().CPlusPlus11)
231 Diag(Loc: StartLoc, DiagID: diag::warn_cxx98_compat_top_level_semi)
232 << FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
233 else
234 Diag(Loc: StartLoc, DiagID: diag::ext_extra_semi_cxx11)
235 << FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
236 return;
237 }
238
239 if (Kind != ExtraSemiKind::AfterMemberFunctionDefinition || HadMultipleSemis)
240 Diag(Loc: StartLoc, DiagID: diag::ext_extra_semi)
241 << Kind
242 << DeclSpec::getSpecifierName(
243 T: TST, Policy: Actions.getASTContext().getPrintingPolicy())
244 << FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
245 else
246 // A single semicolon is valid after a member function definition.
247 Diag(Loc: StartLoc, DiagID: diag::warn_extra_semi_after_mem_fn_def)
248 << FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
249}
250
251bool Parser::expectIdentifier() {
252 if (Tok.is(K: tok::identifier))
253 return false;
254 if (const auto *II = Tok.getIdentifierInfo()) {
255 if (II->isCPlusPlusKeyword(LangOpts: getLangOpts())) {
256 Diag(Tok, DiagID: diag::err_expected_token_instead_of_objcxx_keyword)
257 << tok::identifier << Tok.getIdentifierInfo();
258 // Objective-C++: Recover by treating this keyword as a valid identifier.
259 return false;
260 }
261 }
262 Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
263 return true;
264}
265
266void Parser::checkCompoundToken(SourceLocation FirstTokLoc,
267 tok::TokenKind FirstTokKind, CompoundToken Op) {
268 if (FirstTokLoc.isInvalid())
269 return;
270 SourceLocation SecondTokLoc = Tok.getLocation();
271
272 // If either token is in a macro, we expect both tokens to come from the same
273 // macro expansion.
274 if ((FirstTokLoc.isMacroID() || SecondTokLoc.isMacroID()) &&
275 PP.getSourceManager().getFileID(SpellingLoc: FirstTokLoc) !=
276 PP.getSourceManager().getFileID(SpellingLoc: SecondTokLoc)) {
277 Diag(Loc: FirstTokLoc, DiagID: diag::warn_compound_token_split_by_macro)
278 << (FirstTokKind == Tok.getKind()) << FirstTokKind << Tok.getKind()
279 << static_cast<int>(Op) << SourceRange(FirstTokLoc);
280 Diag(Loc: SecondTokLoc, DiagID: diag::note_compound_token_split_second_token_here)
281 << (FirstTokKind == Tok.getKind()) << Tok.getKind()
282 << SourceRange(SecondTokLoc);
283 return;
284 }
285
286 // We expect the tokens to abut.
287 if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
288 SourceLocation SpaceLoc = PP.getLocForEndOfToken(Loc: FirstTokLoc);
289 if (SpaceLoc.isInvalid())
290 SpaceLoc = FirstTokLoc;
291 Diag(Loc: SpaceLoc, DiagID: diag::warn_compound_token_split_by_whitespace)
292 << (FirstTokKind == Tok.getKind()) << FirstTokKind << Tok.getKind()
293 << static_cast<int>(Op) << SourceRange(FirstTokLoc, SecondTokLoc);
294 return;
295 }
296}
297
298//===----------------------------------------------------------------------===//
299// Error recovery.
300//===----------------------------------------------------------------------===//
301
302static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
303 return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
304}
305
306bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
307 // We always want this function to skip at least one token if the first token
308 // isn't T and if not at EOF.
309 bool isFirstTokenSkipped = true;
310 while (true) {
311 // If we found one of the tokens, stop and return true.
312 for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
313 if (Tok.is(K: Toks[i])) {
314 if (HasFlagsSet(L: Flags, R: StopBeforeMatch)) {
315 // Noop, don't consume the token.
316 } else {
317 ConsumeAnyToken();
318 }
319 return true;
320 }
321 }
322
323 // Important special case: The caller has given up and just wants us to
324 // skip the rest of the file. Do this without recursing, since we can
325 // get here precisely because the caller detected too much recursion.
326 if (Toks.size() == 1 && Toks[0] == tok::eof &&
327 !HasFlagsSet(L: Flags, R: StopAtSemi) &&
328 !HasFlagsSet(L: Flags, R: StopAtCodeCompletion)) {
329 while (Tok.isNot(K: tok::eof))
330 ConsumeAnyToken();
331 return true;
332 }
333
334 switch (Tok.getKind()) {
335 case tok::eof:
336 // Ran out of tokens.
337 return false;
338
339 case tok::annot_pragma_openmp:
340 case tok::annot_attr_openmp:
341 case tok::annot_pragma_openmp_end:
342 // Stop before an OpenMP pragma boundary.
343 if (OpenMPDirectiveParsing)
344 return false;
345 ConsumeAnnotationToken();
346 break;
347 case tok::annot_pragma_openacc:
348 case tok::annot_pragma_openacc_end:
349 // Stop before an OpenACC pragma boundary.
350 if (OpenACCDirectiveParsing)
351 return false;
352 ConsumeAnnotationToken();
353 break;
354 case tok::annot_module_begin:
355 case tok::annot_module_end:
356 case tok::annot_module_include:
357 // Stop before we change submodules. They generally indicate a "good"
358 // place to pick up parsing again (except in the special case where
359 // we're trying to skip to EOF).
360 return false;
361
362 case tok::code_completion:
363 if (!HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
364 handleUnexpectedCodeCompletionToken();
365 return false;
366
367 case tok::l_paren:
368 // Recursively skip properly-nested parens.
369 ConsumeParen();
370 if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
371 SkipUntil(T: tok::r_paren, Flags: StopAtCodeCompletion);
372 else
373 SkipUntil(T: tok::r_paren);
374 break;
375 case tok::l_square:
376 // Recursively skip properly-nested square brackets.
377 ConsumeBracket();
378 if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
379 SkipUntil(T: tok::r_square, Flags: StopAtCodeCompletion);
380 else
381 SkipUntil(T: tok::r_square);
382 break;
383 case tok::l_brace:
384 // Recursively skip properly-nested braces.
385 ConsumeBrace();
386 if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
387 SkipUntil(T: tok::r_brace, Flags: StopAtCodeCompletion);
388 else
389 SkipUntil(T: tok::r_brace);
390 break;
391 case tok::question:
392 // Recursively skip ? ... : pairs; these function as brackets. But
393 // still stop at a semicolon if requested.
394 ConsumeToken();
395 SkipUntil(T: tok::colon,
396 Flags: SkipUntilFlags(unsigned(Flags) &
397 unsigned(StopAtCodeCompletion | StopAtSemi)));
398 break;
399
400 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
401 // Since the user wasn't looking for this token (if they were, it would
402 // already be handled), this isn't balanced. If there is a LHS token at a
403 // higher level, we will assume that this matches the unbalanced token
404 // and return it. Otherwise, this is a spurious RHS token, which we skip.
405 case tok::r_paren:
406 if (ParenCount && !isFirstTokenSkipped)
407 return false; // Matches something.
408 ConsumeParen();
409 break;
410 case tok::r_square:
411 if (BracketCount && !isFirstTokenSkipped)
412 return false; // Matches something.
413 ConsumeBracket();
414 break;
415 case tok::r_brace:
416 if (BraceCount && !isFirstTokenSkipped)
417 return false; // Matches something.
418 ConsumeBrace();
419 break;
420
421 case tok::semi:
422 if (HasFlagsSet(L: Flags, R: StopAtSemi))
423 return false;
424 [[fallthrough]];
425 default:
426 // Skip this token.
427 ConsumeAnyToken();
428 break;
429 }
430 isFirstTokenSkipped = false;
431 }
432}
433
434//===----------------------------------------------------------------------===//
435// Scope manipulation
436//===----------------------------------------------------------------------===//
437
438void Parser::EnterScope(unsigned ScopeFlags) {
439 if (NumCachedScopes) {
440 Scope *N = ScopeCache[--NumCachedScopes];
441 N->Init(parent: getCurScope(), flags: ScopeFlags);
442 Actions.CurScope = N;
443 } else {
444 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
445 }
446}
447
448void Parser::ExitScope() {
449 assert(getCurScope() && "Scope imbalance!");
450
451 // Inform the actions module that this scope is going away if there are any
452 // decls in it.
453 Actions.ActOnPopScope(Loc: Tok.getLocation(), S: getCurScope());
454
455 Scope *OldScope = getCurScope();
456 Actions.CurScope = OldScope->getParent();
457
458 if (NumCachedScopes == ScopeCacheSize)
459 delete OldScope;
460 else
461 ScopeCache[NumCachedScopes++] = OldScope;
462}
463
464Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
465 bool ManageFlags)
466 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
467 if (CurScope) {
468 OldFlags = CurScope->getFlags();
469 CurScope->setFlags(ScopeFlags);
470 }
471}
472
473Parser::ParseScopeFlags::~ParseScopeFlags() {
474 if (CurScope)
475 CurScope->setFlags(OldFlags);
476}
477
478
479//===----------------------------------------------------------------------===//
480// C99 6.9: External Definitions.
481//===----------------------------------------------------------------------===//
482
483Parser::~Parser() {
484 // If we still have scopes active, delete the scope tree.
485 delete getCurScope();
486 Actions.CurScope = nullptr;
487
488 // Free the scope cache.
489 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
490 delete ScopeCache[i];
491
492 resetPragmaHandlers();
493
494 PP.removeCommentHandler(Handler: CommentSemaHandler.get());
495
496 PP.clearCodeCompletionHandler();
497
498 DestroyTemplateIds();
499}
500
501void Parser::Initialize() {
502 // Create the translation unit scope. Install it as the current scope.
503 assert(getCurScope() == nullptr && "A scope is already active?");
504 EnterScope(ScopeFlags: Scope::DeclScope);
505 Actions.ActOnTranslationUnitScope(S: getCurScope());
506
507 // Initialization for Objective-C context sensitive keywords recognition.
508 // Referenced in Parser::ParseObjCTypeQualifierList.
509 if (getLangOpts().ObjC) {
510 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::in)] =
511 &PP.getIdentifierTable().get(Name: "in");
512 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::out)] =
513 &PP.getIdentifierTable().get(Name: "out");
514 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::inout)] =
515 &PP.getIdentifierTable().get(Name: "inout");
516 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::oneway)] =
517 &PP.getIdentifierTable().get(Name: "oneway");
518 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::bycopy)] =
519 &PP.getIdentifierTable().get(Name: "bycopy");
520 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::byref)] =
521 &PP.getIdentifierTable().get(Name: "byref");
522 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::nonnull)] =
523 &PP.getIdentifierTable().get(Name: "nonnull");
524 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::nullable)] =
525 &PP.getIdentifierTable().get(Name: "nullable");
526 ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::null_unspecified)] =
527 &PP.getIdentifierTable().get(Name: "null_unspecified");
528 }
529
530 Ident_instancetype = nullptr;
531 Ident_final = nullptr;
532 Ident_sealed = nullptr;
533 Ident_abstract = nullptr;
534 Ident_override = nullptr;
535 Ident_GNU_final = nullptr;
536
537 Ident_super = &PP.getIdentifierTable().get(Name: "super");
538
539 Ident_vector = nullptr;
540 Ident_bool = nullptr;
541 Ident_Bool = nullptr;
542 Ident_pixel = nullptr;
543 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
544 Ident_vector = &PP.getIdentifierTable().get(Name: "vector");
545 Ident_bool = &PP.getIdentifierTable().get(Name: "bool");
546 Ident_Bool = &PP.getIdentifierTable().get(Name: "_Bool");
547 }
548 if (getLangOpts().AltiVec)
549 Ident_pixel = &PP.getIdentifierTable().get(Name: "pixel");
550
551 Ident_introduced = nullptr;
552 Ident_deprecated = nullptr;
553 Ident_obsoleted = nullptr;
554 Ident_unavailable = nullptr;
555 Ident_strict = nullptr;
556 Ident_replacement = nullptr;
557
558 Ident_language = Ident_defined_in = Ident_generated_declaration = Ident_USR =
559 nullptr;
560
561 Ident__except = nullptr;
562 Ident_except = nullptr;
563
564 Ident__exception_code = Ident__exception_info = nullptr;
565 Ident__abnormal_termination = Ident___exception_code = nullptr;
566 Ident___exception_info = Ident___abnormal_termination = nullptr;
567 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
568 Ident_AbnormalTermination = nullptr;
569
570 if(getLangOpts().Borland) {
571 Ident__exception_info = PP.getIdentifierInfo(Name: "_exception_info");
572 Ident___exception_info = PP.getIdentifierInfo(Name: "__exception_info");
573 Ident_GetExceptionInfo = PP.getIdentifierInfo(Name: "GetExceptionInformation");
574 Ident__exception_code = PP.getIdentifierInfo(Name: "_exception_code");
575 Ident___exception_code = PP.getIdentifierInfo(Name: "__exception_code");
576 Ident_GetExceptionCode = PP.getIdentifierInfo(Name: "GetExceptionCode");
577 Ident__abnormal_termination = PP.getIdentifierInfo(Name: "_abnormal_termination");
578 Ident___abnormal_termination = PP.getIdentifierInfo(Name: "__abnormal_termination");
579 Ident_AbnormalTermination = PP.getIdentifierInfo(Name: "AbnormalTermination");
580
581 PP.SetPoisonReason(II: Ident__exception_code,DiagID: diag::err_seh___except_block);
582 PP.SetPoisonReason(II: Ident___exception_code,DiagID: diag::err_seh___except_block);
583 PP.SetPoisonReason(II: Ident_GetExceptionCode,DiagID: diag::err_seh___except_block);
584 PP.SetPoisonReason(II: Ident__exception_info,DiagID: diag::err_seh___except_filter);
585 PP.SetPoisonReason(II: Ident___exception_info,DiagID: diag::err_seh___except_filter);
586 PP.SetPoisonReason(II: Ident_GetExceptionInfo,DiagID: diag::err_seh___except_filter);
587 PP.SetPoisonReason(II: Ident__abnormal_termination,DiagID: diag::err_seh___finally_block);
588 PP.SetPoisonReason(II: Ident___abnormal_termination,DiagID: diag::err_seh___finally_block);
589 PP.SetPoisonReason(II: Ident_AbnormalTermination,DiagID: diag::err_seh___finally_block);
590 }
591
592 Actions.Initialize();
593
594 // Prime the lexer look-ahead.
595 ConsumeToken();
596}
597
598void Parser::DestroyTemplateIds() {
599 for (TemplateIdAnnotation *Id : TemplateIds)
600 Id->Destroy();
601 TemplateIds.clear();
602}
603
604bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result,
605 Sema::ModuleImportState &ImportState) {
606 Actions.ActOnStartOfTranslationUnit();
607
608 // For C++20 modules, a module decl must be the first in the TU. We also
609 // need to track module imports.
610 ImportState = Sema::ModuleImportState::FirstDecl;
611 bool NoTopLevelDecls = ParseTopLevelDecl(Result, ImportState);
612
613 // C11 6.9p1 says translation units must have at least one top-level
614 // declaration. C++ doesn't have this restriction. We also don't want to
615 // complain if we have a precompiled header, although technically if the PCH
616 // is empty we should still emit the (pedantic) diagnostic.
617 // If the main file is a header, we're only pretending it's a TU; don't warn.
618 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
619 !getLangOpts().CPlusPlus && !getLangOpts().IsHeaderFile)
620 Diag(DiagID: diag::ext_empty_translation_unit);
621
622 return NoTopLevelDecls;
623}
624
625bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result,
626 Sema::ModuleImportState &ImportState) {
627 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
628
629 Result = nullptr;
630 switch (Tok.getKind()) {
631 case tok::annot_pragma_unused:
632 HandlePragmaUnused();
633 return false;
634
635 case tok::kw_export:
636 switch (NextToken().getKind()) {
637 case tok::kw_module:
638 goto module_decl;
639 case tok::kw_import:
640 goto import_decl;
641 default:
642 break;
643 }
644 break;
645
646 case tok::kw_module:
647 module_decl:
648 Result = ParseModuleDecl(ImportState);
649 return false;
650
651 case tok::kw_import:
652 import_decl: {
653 Decl *ImportDecl = ParseModuleImport(AtLoc: SourceLocation(), ImportState);
654 Result = Actions.ConvertDeclToDeclGroup(Ptr: ImportDecl);
655 return false;
656 }
657
658 case tok::annot_module_include: {
659 auto Loc = Tok.getLocation();
660 Module *Mod = reinterpret_cast<Module *>(Tok.getAnnotationValue());
661 // FIXME: We need a better way to disambiguate C++ clang modules and
662 // standard C++ modules.
663 if (!getLangOpts().CPlusPlusModules || !Mod->isHeaderUnit())
664 Actions.ActOnAnnotModuleInclude(DirectiveLoc: Loc, Mod);
665 else {
666 DeclResult Import =
667 Actions.ActOnModuleImport(StartLoc: Loc, ExportLoc: SourceLocation(), ImportLoc: Loc, M: Mod);
668 Decl *ImportDecl = Import.isInvalid() ? nullptr : Import.get();
669 Result = Actions.ConvertDeclToDeclGroup(Ptr: ImportDecl);
670 }
671 ConsumeAnnotationToken();
672 return false;
673 }
674
675 case tok::annot_module_begin:
676 Actions.ActOnAnnotModuleBegin(
677 DirectiveLoc: Tok.getLocation(),
678 Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
679 ConsumeAnnotationToken();
680 ImportState = Sema::ModuleImportState::NotACXX20Module;
681 return false;
682
683 case tok::annot_module_end:
684 Actions.ActOnAnnotModuleEnd(
685 DirectiveLoc: Tok.getLocation(),
686 Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
687 ConsumeAnnotationToken();
688 ImportState = Sema::ModuleImportState::NotACXX20Module;
689 return false;
690
691 case tok::eof:
692 // Check whether -fmax-tokens= was reached.
693 if (PP.getMaxTokens() != 0 && PP.getTokenCount() > PP.getMaxTokens()) {
694 PP.Diag(Loc: Tok.getLocation(), DiagID: diag::warn_max_tokens_total)
695 << PP.getTokenCount() << PP.getMaxTokens();
696 SourceLocation OverrideLoc = PP.getMaxTokensOverrideLoc();
697 if (OverrideLoc.isValid()) {
698 PP.Diag(Loc: OverrideLoc, DiagID: diag::note_max_tokens_total_override);
699 }
700 }
701
702 // Late template parsing can begin.
703 Actions.SetLateTemplateParser(LTP: LateTemplateParserCallback, P: this);
704 Actions.ActOnEndOfTranslationUnit();
705 //else don't tell Sema that we ended parsing: more input might come.
706 return true;
707 default:
708 break;
709 }
710
711 ParsedAttributes DeclAttrs(AttrFactory);
712 ParsedAttributes DeclSpecAttrs(AttrFactory);
713 // GNU attributes are applied to the declaration specification while the
714 // standard attributes are applied to the declaration. We parse the two
715 // attribute sets into different containters so we can apply them during
716 // the regular parsing process.
717 while (MaybeParseCXX11Attributes(Attrs&: DeclAttrs) ||
718 MaybeParseGNUAttributes(Attrs&: DeclSpecAttrs))
719 ;
720
721 Result = ParseExternalDeclaration(DeclAttrs, DeclSpecAttrs);
722 // An empty Result might mean a line with ';' or some parsing error, ignore
723 // it.
724 if (Result) {
725 if (ImportState == Sema::ModuleImportState::FirstDecl)
726 // First decl was not modular.
727 ImportState = Sema::ModuleImportState::NotACXX20Module;
728 else if (ImportState == Sema::ModuleImportState::ImportAllowed)
729 // Non-imports disallow further imports.
730 ImportState = Sema::ModuleImportState::ImportFinished;
731 else if (ImportState ==
732 Sema::ModuleImportState::PrivateFragmentImportAllowed)
733 // Non-imports disallow further imports.
734 ImportState = Sema::ModuleImportState::PrivateFragmentImportFinished;
735 }
736 return false;
737}
738
739Parser::DeclGroupPtrTy
740Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
741 ParsedAttributes &DeclSpecAttrs,
742 ParsingDeclSpec *DS) {
743 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
744 ParenBraceBracketBalancer BalancerRAIIObj(*this);
745
746 if (PP.isCodeCompletionReached()) {
747 cutOffParsing();
748 return nullptr;
749 }
750
751 Decl *SingleDecl = nullptr;
752 switch (Tok.getKind()) {
753 case tok::annot_pragma_vis:
754 HandlePragmaVisibility();
755 return nullptr;
756 case tok::annot_pragma_pack:
757 HandlePragmaPack();
758 return nullptr;
759 case tok::annot_pragma_msstruct:
760 HandlePragmaMSStruct();
761 return nullptr;
762 case tok::annot_pragma_align:
763 HandlePragmaAlign();
764 return nullptr;
765 case tok::annot_pragma_weak:
766 HandlePragmaWeak();
767 return nullptr;
768 case tok::annot_pragma_weakalias:
769 HandlePragmaWeakAlias();
770 return nullptr;
771 case tok::annot_pragma_redefine_extname:
772 HandlePragmaRedefineExtname();
773 return nullptr;
774 case tok::annot_pragma_fp_contract:
775 HandlePragmaFPContract();
776 return nullptr;
777 case tok::annot_pragma_fenv_access:
778 case tok::annot_pragma_fenv_access_ms:
779 HandlePragmaFEnvAccess();
780 return nullptr;
781 case tok::annot_pragma_fenv_round:
782 HandlePragmaFEnvRound();
783 return nullptr;
784 case tok::annot_pragma_cx_limited_range:
785 HandlePragmaCXLimitedRange();
786 return nullptr;
787 case tok::annot_pragma_float_control:
788 HandlePragmaFloatControl();
789 return nullptr;
790 case tok::annot_pragma_fp:
791 HandlePragmaFP();
792 break;
793 case tok::annot_pragma_opencl_extension:
794 HandlePragmaOpenCLExtension();
795 return nullptr;
796 case tok::annot_attr_openmp:
797 case tok::annot_pragma_openmp: {
798 AccessSpecifier AS = AS_none;
799 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs);
800 }
801 case tok::annot_pragma_openacc: {
802 AccessSpecifier AS = AS_none;
803 return ParseOpenACCDirectiveDecl(AS, Attrs, TagType: DeclSpec::TST_unspecified,
804 /*TagDecl=*/nullptr);
805 }
806 case tok::annot_pragma_ms_pointers_to_members:
807 HandlePragmaMSPointersToMembers();
808 return nullptr;
809 case tok::annot_pragma_ms_vtordisp:
810 HandlePragmaMSVtorDisp();
811 return nullptr;
812 case tok::annot_pragma_ms_pragma:
813 HandlePragmaMSPragma();
814 return nullptr;
815 case tok::annot_pragma_dump:
816 HandlePragmaDump();
817 return nullptr;
818 case tok::annot_pragma_attribute:
819 HandlePragmaAttribute();
820 return nullptr;
821 case tok::annot_pragma_export:
822 HandlePragmaExport();
823 return nullptr;
824 case tok::semi:
825 // Either a C++11 empty-declaration or attribute-declaration.
826 SingleDecl =
827 Actions.ActOnEmptyDeclaration(S: getCurScope(), AttrList: Attrs, SemiLoc: Tok.getLocation());
828 ConsumeExtraSemi(Kind: ExtraSemiKind::OutsideFunction);
829 break;
830 case tok::r_brace:
831 Diag(Tok, DiagID: diag::err_extraneous_closing_brace);
832 ConsumeBrace();
833 return nullptr;
834 case tok::eof:
835 Diag(Tok, DiagID: diag::err_expected_external_declaration);
836 return nullptr;
837 case tok::kw___extension__: {
838 // __extension__ silences extension warnings in the subexpression.
839 ExtensionRAIIObject O(Diags); // Use RAII to do this.
840 ConsumeToken();
841 return ParseExternalDeclaration(Attrs, DeclSpecAttrs);
842 }
843 case tok::kw_asm: {
844 ProhibitAttributes(Attrs);
845
846 SourceLocation StartLoc = Tok.getLocation();
847 SourceLocation EndLoc;
848
849 ExprResult Result(ParseSimpleAsm(/*ForAsmLabel*/ false, EndLoc: &EndLoc));
850
851 // Check if GNU-style InlineAsm is disabled.
852 // Empty asm string is allowed because it will not introduce
853 // any assembly code.
854 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
855 const auto *SL = cast<StringLiteral>(Val: Result.get());
856 if (!SL->getString().trim().empty())
857 Diag(Loc: StartLoc, DiagID: diag::err_gnu_inline_asm_disabled);
858 }
859
860 ExpectAndConsume(ExpectedTok: tok::semi, DiagID: diag::err_expected_after,
861 Msg: "top-level asm block");
862
863 if (Result.isInvalid())
864 return nullptr;
865 SingleDecl = Actions.ActOnFileScopeAsmDecl(expr: Result.get(), AsmLoc: StartLoc, RParenLoc: EndLoc);
866 break;
867 }
868 case tok::at:
869 return ParseObjCAtDirectives(DeclAttrs&: Attrs, DeclSpecAttrs);
870 case tok::minus:
871 case tok::plus:
872 if (!getLangOpts().ObjC) {
873 Diag(Tok, DiagID: diag::err_expected_external_declaration);
874 ConsumeToken();
875 return nullptr;
876 }
877 SingleDecl = ParseObjCMethodDefinition();
878 break;
879 case tok::code_completion:
880 cutOffParsing();
881 if (CurParsedObjCImpl) {
882 // Code-complete Objective-C methods even without leading '-'/'+' prefix.
883 Actions.CodeCompletion().CodeCompleteObjCMethodDecl(
884 S: getCurScope(),
885 /*IsInstanceMethod=*/std::nullopt,
886 /*ReturnType=*/nullptr);
887 }
888
889 SemaCodeCompletion::ParserCompletionContext PCC;
890 if (CurParsedObjCImpl) {
891 PCC = SemaCodeCompletion::PCC_ObjCImplementation;
892 } else if (PP.isIncrementalProcessingEnabled()) {
893 PCC = SemaCodeCompletion::PCC_TopLevelOrExpression;
894 } else {
895 PCC = SemaCodeCompletion::PCC_Namespace;
896 };
897 Actions.CodeCompletion().CodeCompleteOrdinaryName(S: getCurScope(), CompletionContext: PCC);
898 return nullptr;
899 case tok::kw_import: {
900 Sema::ModuleImportState IS = Sema::ModuleImportState::NotACXX20Module;
901 if (getLangOpts().CPlusPlusModules) {
902 Diag(Tok, DiagID: diag::err_unexpected_module_or_import_decl)
903 << /*IsImport*/ true;
904 SkipUntil(T: tok::semi);
905 return nullptr;
906 }
907 SingleDecl = ParseModuleImport(AtLoc: SourceLocation(), ImportState&: IS);
908 } break;
909 case tok::kw_export:
910 if (getLangOpts().CPlusPlusModules || getLangOpts().HLSL) {
911 ProhibitAttributes(Attrs);
912 SingleDecl = ParseExportDeclaration();
913 break;
914 }
915 // This must be 'export template'. Parse it so we can diagnose our lack
916 // of support.
917 [[fallthrough]];
918 case tok::kw_using:
919 case tok::kw_namespace:
920 case tok::kw_typedef:
921 case tok::kw_template:
922 case tok::kw_static_assert:
923 case tok::kw__Static_assert:
924 // A function definition cannot start with any of these keywords.
925 {
926 SourceLocation DeclEnd;
927 return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
928 DeclSpecAttrs);
929 }
930
931 case tok::kw_cbuffer:
932 case tok::kw_tbuffer:
933 if (getLangOpts().HLSL) {
934 SourceLocation DeclEnd;
935 return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
936 DeclSpecAttrs);
937 }
938 goto dont_know;
939
940 case tok::kw_static:
941 // Parse (then ignore) 'static' prior to a template instantiation. This is
942 // a GCC extension that we intentionally do not support.
943 if (getLangOpts().CPlusPlus && NextToken().is(K: tok::kw_template)) {
944 Diag(Loc: ConsumeToken(), DiagID: diag::warn_static_inline_explicit_inst_ignored)
945 << 0;
946 SourceLocation DeclEnd;
947 return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
948 DeclSpecAttrs);
949 }
950 goto dont_know;
951
952 case tok::kw_inline:
953 if (getLangOpts().CPlusPlus) {
954 tok::TokenKind NextKind = NextToken().getKind();
955
956 // Inline namespaces. Allowed as an extension even in C++03.
957 if (NextKind == tok::kw_namespace) {
958 SourceLocation DeclEnd;
959 return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
960 DeclSpecAttrs);
961 }
962
963 // Parse (then ignore) 'inline' prior to a template instantiation. This is
964 // a GCC extension that we intentionally do not support.
965 if (NextKind == tok::kw_template) {
966 Diag(Loc: ConsumeToken(), DiagID: diag::warn_static_inline_explicit_inst_ignored)
967 << 1;
968 SourceLocation DeclEnd;
969 return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
970 DeclSpecAttrs);
971 }
972 }
973 goto dont_know;
974
975 case tok::kw_extern:
976 if (getLangOpts().CPlusPlus && NextToken().is(K: tok::kw_template)) {
977 ProhibitAttributes(Attrs);
978 ProhibitAttributes(Attrs&: DeclSpecAttrs);
979 // Extern templates
980 SourceLocation ExternLoc = ConsumeToken();
981 SourceLocation TemplateLoc = ConsumeToken();
982 DiagCompat(Loc: ExternLoc, CompatDiagId: diag_compat::extern_template)
983 << SourceRange(ExternLoc, TemplateLoc);
984 SourceLocation DeclEnd;
985 return ParseExplicitInstantiation(Context: DeclaratorContext::File, ExternLoc,
986 TemplateLoc, DeclEnd, AccessAttrs&: Attrs);
987 }
988 goto dont_know;
989
990 case tok::kw___if_exists:
991 case tok::kw___if_not_exists:
992 ParseMicrosoftIfExistsExternalDeclaration();
993 return nullptr;
994
995 case tok::kw_module:
996 Diag(Tok, DiagID: diag::err_unexpected_module_or_import_decl) << /*IsImport*/ false;
997 SkipUntil(T: tok::semi);
998 return nullptr;
999
1000 default:
1001 dont_know:
1002 if (Tok.isEditorPlaceholder()) {
1003 ConsumeToken();
1004 return nullptr;
1005 }
1006 if (getLangOpts().IncrementalExtensions &&
1007 !isDeclarationStatement(/*DisambiguatingWithExpression=*/true))
1008 return ParseTopLevelStmtDecl();
1009
1010 // We can't tell whether this is a function-definition or declaration yet.
1011 if (!SingleDecl)
1012 return ParseDeclarationOrFunctionDefinition(DeclAttrs&: Attrs, DeclSpecAttrs, DS);
1013 }
1014
1015 // This routine returns a DeclGroup, if the thing we parsed only contains a
1016 // single decl, convert it now.
1017 return Actions.ConvertDeclToDeclGroup(Ptr: SingleDecl);
1018}
1019
1020bool Parser::isDeclarationAfterDeclarator() {
1021 // Check for '= delete' or '= default'
1022 if (getLangOpts().CPlusPlus && Tok.is(K: tok::equal)) {
1023 const Token &KW = NextToken();
1024 if (KW.is(K: tok::kw_default) || KW.is(K: tok::kw_delete))
1025 return false;
1026 }
1027
1028 return Tok.is(K: tok::equal) || // int X()= -> not a function def
1029 Tok.is(K: tok::comma) || // int X(), -> not a function def
1030 Tok.is(K: tok::semi) || // int X(); -> not a function def
1031 Tok.is(K: tok::kw_asm) || // int X() __asm__ -> not a function def
1032 Tok.is(K: tok::kw___attribute) || // int X() __attr__ -> not a function def
1033 (getLangOpts().CPlusPlus &&
1034 Tok.is(K: tok::l_paren)); // int X(0) -> not a function def [C++]
1035}
1036
1037bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
1038 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
1039 if (Tok.is(K: tok::l_brace)) // int X() {}
1040 return true;
1041
1042 // Handle K&R C argument lists: int X(f) int f; {}
1043 if (!getLangOpts().CPlusPlus &&
1044 Declarator.getFunctionTypeInfo().isKNRPrototype())
1045 return isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No);
1046
1047 if (getLangOpts().CPlusPlus && Tok.is(K: tok::equal)) {
1048 const Token &KW = NextToken();
1049 return KW.is(K: tok::kw_default) || KW.is(K: tok::kw_delete);
1050 }
1051
1052 return Tok.is(K: tok::colon) || // X() : Base() {} (used for ctors)
1053 Tok.is(K: tok::kw_try); // X() try { ... }
1054}
1055
1056Parser::DeclGroupPtrTy Parser::ParseDeclOrFunctionDefInternal(
1057 ParsedAttributes &Attrs, ParsedAttributes &DeclSpecAttrs,
1058 ParsingDeclSpec &DS, AccessSpecifier AS) {
1059 // Because we assume that the DeclSpec has not yet been initialised, we simply
1060 // overwrite the source range and attribute the provided leading declspec
1061 // attributes.
1062 assert(DS.getSourceRange().isInvalid() &&
1063 "expected uninitialised source range");
1064 DS.SetRangeStart(DeclSpecAttrs.Range.getBegin());
1065 DS.SetRangeEnd(DeclSpecAttrs.Range.getEnd());
1066 DS.takeAttributesAppendingingFrom(attrs&: DeclSpecAttrs);
1067
1068 ParsedTemplateInfo TemplateInfo;
1069 MaybeParseMicrosoftAttributes(Attrs&: DS.getAttributes());
1070 // Parse the common declaration-specifiers piece.
1071 ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
1072 DSC: DeclSpecContext::DSC_top_level);
1073
1074 // If we had a free-standing type definition with a missing semicolon, we
1075 // may get this far before the problem becomes obvious.
1076 if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
1077 DS, AS, DSContext: DeclSpecContext::DSC_top_level))
1078 return nullptr;
1079
1080 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1081 // declaration-specifiers init-declarator-list[opt] ';'
1082 if (Tok.is(K: tok::semi)) {
1083 // Suggest correct location to fix '[[attrib]] struct' to 'struct
1084 // [[attrib]]'
1085 SourceLocation CorrectLocationForAttributes{};
1086 TypeSpecifierType TKind = DS.getTypeSpecType();
1087 if (DeclSpec::isDeclRep(T: TKind)) {
1088 if (TKind == DeclSpec::TST_enum) {
1089 if (const auto *ED = dyn_cast_or_null<EnumDecl>(Val: DS.getRepAsDecl())) {
1090 CorrectLocationForAttributes =
1091 PP.getLocForEndOfToken(Loc: ED->getEnumKeyRange().getEnd());
1092 }
1093 }
1094 if (CorrectLocationForAttributes.isInvalid()) {
1095 const auto &Policy = Actions.getASTContext().getPrintingPolicy();
1096 unsigned Offset =
1097 StringRef(DeclSpec::getSpecifierName(T: TKind, Policy)).size();
1098 CorrectLocationForAttributes =
1099 DS.getTypeSpecTypeLoc().getLocWithOffset(Offset);
1100 }
1101 }
1102 ProhibitAttributes(Attrs, FixItLoc: CorrectLocationForAttributes);
1103 ConsumeToken();
1104 RecordDecl *AnonRecord = nullptr;
1105 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
1106 S: getCurScope(), AS: AS_none, DS, DeclAttrs: ParsedAttributesView::none(), AnonRecord);
1107 DS.complete(D: TheDecl);
1108 Actions.ActOnDefinedDeclarationSpecifier(D: TheDecl);
1109 if (AnonRecord) {
1110 Decl* decls[] = {AnonRecord, TheDecl};
1111 return Actions.BuildDeclaratorGroup(Group: decls);
1112 }
1113 return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
1114 }
1115
1116 if (DS.hasTagDefinition())
1117 Actions.ActOnDefinedDeclarationSpecifier(D: DS.getRepAsDecl());
1118
1119 // ObjC2 allows prefix attributes on class interfaces and protocols.
1120 // FIXME: This still needs better diagnostics. We should only accept
1121 // attributes here, no types, etc.
1122 if (getLangOpts().ObjC && Tok.is(K: tok::at)) {
1123 SourceLocation AtLoc = ConsumeToken(); // the "@"
1124 if (!Tok.isObjCAtKeyword(objcKey: tok::objc_interface) &&
1125 !Tok.isObjCAtKeyword(objcKey: tok::objc_protocol) &&
1126 !Tok.isObjCAtKeyword(objcKey: tok::objc_implementation)) {
1127 Diag(Tok, DiagID: diag::err_objc_unexpected_attr);
1128 SkipUntil(T: tok::semi);
1129 return nullptr;
1130 }
1131
1132 DS.abort();
1133 DS.takeAttributesAppendingingFrom(attrs&: Attrs);
1134
1135 const char *PrevSpec = nullptr;
1136 unsigned DiagID;
1137 if (DS.SetTypeSpecType(T: DeclSpec::TST_unspecified, Loc: AtLoc, PrevSpec, DiagID,
1138 Policy: Actions.getASTContext().getPrintingPolicy()))
1139 Diag(Loc: AtLoc, DiagID) << PrevSpec;
1140
1141 if (Tok.isObjCAtKeyword(objcKey: tok::objc_protocol))
1142 return ParseObjCAtProtocolDeclaration(atLoc: AtLoc, prefixAttrs&: DS.getAttributes());
1143
1144 if (Tok.isObjCAtKeyword(objcKey: tok::objc_implementation))
1145 return ParseObjCAtImplementationDeclaration(AtLoc, Attrs&: DS.getAttributes());
1146
1147 return Actions.ConvertDeclToDeclGroup(
1148 Ptr: ParseObjCAtInterfaceDeclaration(AtLoc, prefixAttrs&: DS.getAttributes()));
1149 }
1150
1151 // If the declspec consisted only of 'extern' and we have a string
1152 // literal following it, this must be a C++ linkage specifier like
1153 // 'extern "C"'.
1154 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
1155 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
1156 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
1157 ProhibitAttributes(Attrs);
1158 Decl *TheDecl = ParseLinkage(DS, Context: DeclaratorContext::File);
1159 return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
1160 }
1161
1162 return ParseDeclGroup(DS, Context: DeclaratorContext::File, Attrs, TemplateInfo);
1163}
1164
1165Parser::DeclGroupPtrTy Parser::ParseDeclarationOrFunctionDefinition(
1166 ParsedAttributes &Attrs, ParsedAttributes &DeclSpecAttrs,
1167 ParsingDeclSpec *DS, AccessSpecifier AS) {
1168 // Add an enclosing time trace scope for a bunch of small scopes with
1169 // "EvaluateAsConstExpr".
1170 llvm::TimeTraceScope TimeScope("ParseDeclarationOrFunctionDefinition", [&]() {
1171 return Tok.getLocation().printToString(
1172 SM: Actions.getASTContext().getSourceManager());
1173 });
1174
1175 if (DS) {
1176 return ParseDeclOrFunctionDefInternal(Attrs, DeclSpecAttrs, DS&: *DS, AS);
1177 } else {
1178 ParsingDeclSpec PDS(*this);
1179 // Must temporarily exit the objective-c container scope for
1180 // parsing c constructs and re-enter objc container scope
1181 // afterwards.
1182 ObjCDeclContextSwitch ObjCDC(*this);
1183
1184 return ParseDeclOrFunctionDefInternal(Attrs, DeclSpecAttrs, DS&: PDS, AS);
1185 }
1186}
1187
1188Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1189 const ParsedTemplateInfo &TemplateInfo,
1190 LateParsedAttrList *LateParsedAttrs) {
1191 llvm::TimeTraceScope TimeScope("ParseFunctionDefinition", [&]() {
1192 return Actions.GetNameForDeclarator(D).getName().getAsString();
1193 });
1194
1195 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1196 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1197 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1198 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1199
1200 // If this is C89 and the declspecs were completely missing, fudge in an
1201 // implicit int. We do this here because this is the only place where
1202 // declaration-specifiers are completely optional in the grammar.
1203 if (getLangOpts().isImplicitIntRequired() && D.getDeclSpec().isEmpty()) {
1204 Diag(Loc: D.getIdentifierLoc(), DiagID: diag::warn_missing_type_specifier)
1205 << D.getDeclSpec().getSourceRange()
1206 << FixItHint::CreateInsertion(InsertionLoc: D.getDeclSpec().getBeginLoc(), Code: "int ");
1207 const char *PrevSpec;
1208 unsigned DiagID;
1209 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1210 D.getMutableDeclSpec().SetTypeSpecType(T: DeclSpec::TST_int,
1211 Loc: D.getIdentifierLoc(),
1212 PrevSpec, DiagID,
1213 Policy);
1214 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1215 }
1216
1217 // If this declaration was formed with a K&R-style identifier list for the
1218 // arguments, parse declarations for all of the args next.
1219 // int foo(a,b) int a; float b; {}
1220 if (FTI.isKNRPrototype())
1221 ParseKNRParamDeclarations(D);
1222
1223 // We should have either an opening brace or, in a C++ constructor,
1224 // we may have a colon.
1225 if (Tok.isNot(K: tok::l_brace) &&
1226 (!getLangOpts().CPlusPlus ||
1227 (Tok.isNot(K: tok::colon) && Tok.isNot(K: tok::kw_try) &&
1228 Tok.isNot(K: tok::equal)))) {
1229 Diag(Tok, DiagID: diag::err_expected_fn_body);
1230
1231 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1232 SkipUntil(T: tok::l_brace, Flags: StopAtSemi | StopBeforeMatch);
1233
1234 // If we didn't find the '{', bail out.
1235 if (Tok.isNot(K: tok::l_brace))
1236 return nullptr;
1237 }
1238
1239 // Check to make sure that any normal attributes are allowed to be on
1240 // a definition. Late parsed attributes are checked at the end.
1241 if (Tok.isNot(K: tok::equal)) {
1242 for (const ParsedAttr &AL : D.getAttributes())
1243 if (AL.isKnownToGCC() && !AL.isStandardAttributeSyntax())
1244 Diag(Loc: AL.getLoc(), DiagID: diag::warn_attribute_on_function_definition) << AL;
1245 }
1246
1247 // In delayed template parsing mode, for function template we consume the
1248 // tokens and store them for late parsing at the end of the translation unit.
1249 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(K: tok::equal) &&
1250 TemplateInfo.Kind == ParsedTemplateKind::Template &&
1251 LateParsedAttrs->empty() && Actions.canDelayFunctionBody(D)) {
1252 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1253
1254 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1255 Scope::CompoundStmtScope);
1256 Scope *ParentScope = getCurScope()->getParent();
1257
1258 D.setFunctionDefinitionKind(FunctionDefinitionKind::Definition);
1259 Decl *DP = Actions.HandleDeclarator(S: ParentScope, D,
1260 TemplateParameterLists);
1261 D.complete(D: DP);
1262 D.getMutableDeclSpec().abort();
1263
1264 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(D: DP)) &&
1265 trySkippingFunctionBody()) {
1266 BodyScope.Exit();
1267 return Actions.ActOnSkippedFunctionBody(Decl: DP);
1268 }
1269
1270 CachedTokens Toks;
1271 LexTemplateFunctionForLateParsing(Toks);
1272
1273 if (DP) {
1274 FunctionDecl *FnD = DP->getAsFunction();
1275 Actions.CheckForFunctionRedefinition(FD: FnD);
1276 Actions.MarkAsLateParsedTemplate(FD: FnD, FnD: DP, Toks);
1277 }
1278 return DP;
1279 }
1280 if (CurParsedObjCImpl && !TemplateInfo.TemplateParams &&
1281 (Tok.is(K: tok::l_brace) || Tok.is(K: tok::kw_try) || Tok.is(K: tok::colon)) &&
1282 Actions.CurContext->isTranslationUnit()) {
1283 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1284 Scope::CompoundStmtScope);
1285 Scope *ParentScope = getCurScope()->getParent();
1286
1287 D.setFunctionDefinitionKind(FunctionDefinitionKind::Definition);
1288 Decl *FuncDecl = Actions.HandleDeclarator(S: ParentScope, D,
1289 TemplateParameterLists: MultiTemplateParamsArg());
1290 D.complete(D: FuncDecl);
1291 D.getMutableDeclSpec().abort();
1292 if (FuncDecl) {
1293 // Consume the tokens and store them for later parsing.
1294 StashAwayMethodOrFunctionBodyTokens(MDecl: FuncDecl);
1295 CurParsedObjCImpl->HasCFunction = true;
1296 return FuncDecl;
1297 }
1298 // FIXME: Should we really fall through here?
1299 }
1300
1301 // Enter a scope for the function body.
1302 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1303 Scope::CompoundStmtScope);
1304
1305 // Parse function body eagerly if it is either '= delete;' or '= default;' as
1306 // ActOnStartOfFunctionDef needs to know whether the function is deleted.
1307 StringLiteral *DeletedMessage = nullptr;
1308 Sema::FnBodyKind BodyKind = Sema::FnBodyKind::Other;
1309 SourceLocation KWLoc;
1310 if (TryConsumeToken(Expected: tok::equal)) {
1311 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1312
1313 if (TryConsumeToken(Expected: tok::kw_delete, Loc&: KWLoc)) {
1314 DiagCompat(Loc: KWLoc, CompatDiagId: diag_compat::defaulted_deleted_function)
1315 << 1 /* deleted */;
1316 BodyKind = Sema::FnBodyKind::Delete;
1317 DeletedMessage = ParseCXXDeletedFunctionMessage();
1318 D.SetRangeEnd(PrevTokLocation);
1319 } else if (TryConsumeToken(Expected: tok::kw_default, Loc&: KWLoc)) {
1320 DiagCompat(Loc: KWLoc, CompatDiagId: diag_compat::defaulted_deleted_function)
1321 << 0 /* defaulted */;
1322 BodyKind = Sema::FnBodyKind::Default;
1323 D.SetRangeEnd(PrevTokLocation);
1324 } else {
1325 llvm_unreachable("function definition after = not 'delete' or 'default'");
1326 }
1327
1328 if (Tok.is(K: tok::comma)) {
1329 Diag(Loc: KWLoc, DiagID: diag::err_default_delete_in_multiple_declaration)
1330 << (BodyKind == Sema::FnBodyKind::Delete);
1331 SkipUntil(T: tok::semi);
1332 } else if (ExpectAndConsume(ExpectedTok: tok::semi, DiagID: diag::err_expected_after,
1333 Msg: BodyKind == Sema::FnBodyKind::Delete
1334 ? "delete"
1335 : "default")) {
1336 SkipUntil(T: tok::semi);
1337 }
1338 }
1339
1340 Sema::FPFeaturesStateRAII SaveFPFeatures(Actions);
1341
1342 // Tell the actions module that we have entered a function definition with the
1343 // specified Declarator for the function.
1344 SkipBodyInfo SkipBody;
1345 Decl *Res = Actions.ActOnStartOfFunctionDef(S: getCurScope(), D,
1346 TemplateParamLists: TemplateInfo.TemplateParams
1347 ? *TemplateInfo.TemplateParams
1348 : MultiTemplateParamsArg(),
1349 SkipBody: &SkipBody, BodyKind);
1350
1351 if (SkipBody.ShouldSkip) {
1352 // Do NOT enter SkipFunctionBody if we already consumed the tokens.
1353 if (BodyKind == Sema::FnBodyKind::Other)
1354 SkipFunctionBody();
1355
1356 // ExpressionEvaluationContext is pushed in ActOnStartOfFunctionDef
1357 // and it would be popped in ActOnFinishFunctionBody.
1358 // We pop it explcitly here since ActOnFinishFunctionBody won't get called.
1359 //
1360 // Do not call PopExpressionEvaluationContext() if it is a lambda because
1361 // one is already popped when finishing the lambda in BuildLambdaExpr().
1362 //
1363 // FIXME: It looks not easy to balance PushExpressionEvaluationContext()
1364 // and PopExpressionEvaluationContext().
1365 if (!isLambdaCallOperator(DC: dyn_cast_if_present<FunctionDecl>(Val: Res)))
1366 Actions.PopExpressionEvaluationContext();
1367 return Res;
1368 }
1369
1370 // Break out of the ParsingDeclarator context before we parse the body.
1371 D.complete(D: Res);
1372
1373 // Break out of the ParsingDeclSpec context, too. This const_cast is
1374 // safe because we're always the sole owner.
1375 D.getMutableDeclSpec().abort();
1376
1377 if (BodyKind != Sema::FnBodyKind::Other) {
1378 Actions.SetFunctionBodyKind(D: Res, Loc: KWLoc, BodyKind, DeletedMessage);
1379 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1380 Actions.ActOnFinishFunctionBody(Decl: Res, Body: GeneratedBody, IsInstantiation: false);
1381 return Res;
1382 }
1383
1384 // With abbreviated function templates - we need to explicitly add depth to
1385 // account for the implicit template parameter list induced by the template.
1386 if (const auto *Template = dyn_cast_if_present<FunctionTemplateDecl>(Val: Res);
1387 Template && Template->isAbbreviated() &&
1388 Template->getTemplateParameters()->getParam(Idx: 0)->isImplicit())
1389 // First template parameter is implicit - meaning no explicit template
1390 // parameter list was specified.
1391 CurTemplateDepthTracker.addDepth(D: 1);
1392
1393 // Late attributes are parsed in the same scope as the function body.
1394 if (LateParsedAttrs)
1395 ParseLexedAttributeList(LAs&: *LateParsedAttrs, D: Res, /*EnterScope=*/false,
1396 /*OnDefinition=*/true);
1397
1398 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(D: Res)) &&
1399 trySkippingFunctionBody()) {
1400 BodyScope.Exit();
1401 Actions.ActOnSkippedFunctionBody(Decl: Res);
1402 return Actions.ActOnFinishFunctionBody(Decl: Res, Body: nullptr, IsInstantiation: false);
1403 }
1404
1405 return ParseFunctionBody(D: Res, BodyScope);
1406}
1407
1408Decl *Parser::ParseFunctionBody(Decl *D, ParseScope &BodyScope) {
1409 if (Tok.is(K: tok::kw_try))
1410 return ParseFunctionTryBlock(Decl: D, BodyScope);
1411
1412 // If we have a colon, then we're probably parsing a C++
1413 // ctor-initializer.
1414 if (Tok.is(K: tok::colon)) {
1415 ParseConstructorInitializer(ConstructorDecl: D);
1416
1417 // Recover from error.
1418 if (!Tok.is(K: tok::l_brace)) {
1419 BodyScope.Exit();
1420 if (D)
1421 D->getAsFunction()->setInvalidDecl();
1422 Actions.ActOnFinishFunctionBody(Decl: D, Body: nullptr);
1423 return D;
1424 }
1425 } else
1426 Actions.ActOnDefaultCtorInitializers(CDtorDecl: D);
1427
1428 return ParseFunctionStatementBody(Decl: D, BodyScope);
1429}
1430
1431void Parser::SkipFunctionBody() {
1432 if (Tok.is(K: tok::equal)) {
1433 SkipUntil(T: tok::semi);
1434 return;
1435 }
1436
1437 bool IsFunctionTryBlock = Tok.is(K: tok::kw_try);
1438 if (IsFunctionTryBlock)
1439 ConsumeToken();
1440
1441 CachedTokens Skipped;
1442 if (ConsumeAndStoreFunctionPrologue(Toks&: Skipped))
1443 SkipMalformedDecl();
1444 else {
1445 SkipUntil(T: tok::r_brace);
1446 while (IsFunctionTryBlock && Tok.is(K: tok::kw_catch)) {
1447 SkipUntil(T: tok::l_brace);
1448 SkipUntil(T: tok::r_brace);
1449 }
1450 }
1451}
1452
1453void Parser::ParseKNRParamDeclarations(Declarator &D) {
1454 // We know that the top-level of this declarator is a function.
1455 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1456
1457 // Enter function-declaration scope, limiting any declarators to the
1458 // function prototype scope, including parameter declarators.
1459 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1460 Scope::FunctionDeclarationScope | Scope::DeclScope);
1461
1462 // Read all the argument declarations.
1463 while (isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No)) {
1464 SourceLocation DSStart = Tok.getLocation();
1465
1466 // Parse the common declaration-specifiers piece.
1467 DeclSpec DS(AttrFactory);
1468 ParsedTemplateInfo TemplateInfo;
1469 ParseDeclarationSpecifiers(DS, TemplateInfo);
1470
1471 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1472 // least one declarator'.
1473 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1474 // the declarations though. It's trivial to ignore them, really hard to do
1475 // anything else with them.
1476 if (TryConsumeToken(Expected: tok::semi)) {
1477 Diag(Loc: DSStart, DiagID: diag::err_declaration_does_not_declare_param);
1478 continue;
1479 }
1480
1481 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1482 // than register.
1483 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1484 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1485 Diag(Loc: DS.getStorageClassSpecLoc(),
1486 DiagID: diag::err_invalid_storage_class_in_func_decl);
1487 DS.ClearStorageClassSpecs();
1488 }
1489 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1490 Diag(Loc: DS.getThreadStorageClassSpecLoc(),
1491 DiagID: diag::err_invalid_storage_class_in_func_decl);
1492 DS.ClearStorageClassSpecs();
1493 }
1494
1495 // Parse the first declarator attached to this declspec.
1496 Declarator ParmDeclarator(DS, ParsedAttributesView::none(),
1497 DeclaratorContext::KNRTypeList);
1498 ParseDeclarator(D&: ParmDeclarator);
1499
1500 // Handle the full declarator list.
1501 while (true) {
1502 // If attributes are present, parse them.
1503 MaybeParseGNUAttributes(D&: ParmDeclarator);
1504
1505 // Ask the actions module to compute the type for this declarator.
1506 Decl *Param =
1507 Actions.ActOnParamDeclarator(S: getCurScope(), D&: ParmDeclarator);
1508
1509 if (Param &&
1510 // A missing identifier has already been diagnosed.
1511 ParmDeclarator.getIdentifier()) {
1512
1513 // Scan the argument list looking for the correct param to apply this
1514 // type.
1515 for (unsigned i = 0; ; ++i) {
1516 // C99 6.9.1p6: those declarators shall declare only identifiers from
1517 // the identifier list.
1518 if (i == FTI.NumParams) {
1519 Diag(Loc: ParmDeclarator.getIdentifierLoc(), DiagID: diag::err_no_matching_param)
1520 << ParmDeclarator.getIdentifier();
1521 break;
1522 }
1523
1524 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1525 // Reject redefinitions of parameters.
1526 if (FTI.Params[i].Param) {
1527 Diag(Loc: ParmDeclarator.getIdentifierLoc(),
1528 DiagID: diag::err_param_redefinition)
1529 << ParmDeclarator.getIdentifier();
1530 } else {
1531 FTI.Params[i].Param = Param;
1532 }
1533 break;
1534 }
1535 }
1536 }
1537
1538 // If we don't have a comma, it is either the end of the list (a ';') or
1539 // an error, bail out.
1540 if (Tok.isNot(K: tok::comma))
1541 break;
1542
1543 ParmDeclarator.clear();
1544
1545 // Consume the comma.
1546 ParmDeclarator.setCommaLoc(ConsumeToken());
1547
1548 // Parse the next declarator.
1549 ParseDeclarator(D&: ParmDeclarator);
1550 }
1551
1552 // Consume ';' and continue parsing.
1553 if (!ExpectAndConsumeSemi(DiagID: diag::err_expected_semi_declaration))
1554 continue;
1555
1556 // Otherwise recover by skipping to next semi or mandatory function body.
1557 if (SkipUntil(T: tok::l_brace, Flags: StopAtSemi | StopBeforeMatch))
1558 break;
1559 TryConsumeToken(Expected: tok::semi);
1560 }
1561
1562 // The actions module must verify that all arguments were declared.
1563 Actions.ActOnFinishKNRParamDeclarations(S: getCurScope(), D, LocAfterDecls: Tok.getLocation());
1564}
1565
1566ExprResult Parser::ParseAsmStringLiteral(bool ForAsmLabel) {
1567
1568 ExprResult AsmString;
1569 if (isTokenStringLiteral()) {
1570 AsmString = ParseStringLiteralExpression();
1571 if (AsmString.isInvalid())
1572 return AsmString;
1573
1574 const auto *SL = cast<StringLiteral>(Val: AsmString.get());
1575 if (!SL->isOrdinary()) {
1576 Diag(Tok, DiagID: diag::err_asm_operand_wide_string_literal)
1577 << SL->isWide() << SL->getSourceRange();
1578 return ExprError();
1579 }
1580 } else if (!ForAsmLabel && getLangOpts().CPlusPlus11 &&
1581 Tok.is(K: tok::l_paren)) {
1582 ParenParseOption ExprType = ParenParseOption::SimpleExpr;
1583 SourceLocation RParenLoc;
1584 ParsedType CastTy;
1585
1586 EnterExpressionEvaluationContext ConstantEvaluated(
1587 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1588 AsmString = ParseParenExpression(
1589 ExprType, /*StopIfCastExr=*/StopIfCastExpr: true, ParenBehavior: ParenExprKind::Unknown,
1590 CorrectionBehavior: TypoCorrectionTypeBehavior::AllowBoth, CastTy, RParenLoc);
1591 if (!AsmString.isInvalid())
1592 AsmString = Actions.ActOnConstantExpression(Res: AsmString);
1593
1594 if (AsmString.isInvalid())
1595 return ExprError();
1596 } else {
1597 Diag(Tok, DiagID: diag::err_asm_expected_string) << /*and expression=*/(
1598 (getLangOpts().CPlusPlus11 && !ForAsmLabel) ? 0 : 1);
1599 }
1600
1601 return Actions.ActOnGCCAsmStmtString(Stm: AsmString.get(), ForAsmLabel);
1602}
1603
1604ExprResult Parser::ParseSimpleAsm(bool ForAsmLabel, SourceLocation *EndLoc) {
1605 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1606 SourceLocation Loc = ConsumeToken();
1607
1608 if (isGNUAsmQualifier(TokAfterAsm: Tok)) {
1609 // Remove from the end of 'asm' to the end of the asm qualifier.
1610 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1611 PP.getLocForEndOfToken(Loc: Tok.getLocation()));
1612 Diag(Tok, DiagID: diag::err_global_asm_qualifier_ignored)
1613 << GNUAsmQualifiers::getQualifierName(Qualifier: getGNUAsmQualifier(Tok))
1614 << FixItHint::CreateRemoval(RemoveRange: RemovalRange);
1615 ConsumeToken();
1616 }
1617
1618 BalancedDelimiterTracker T(*this, tok::l_paren);
1619 if (T.consumeOpen()) {
1620 Diag(Tok, DiagID: diag::err_expected_lparen_after) << "asm";
1621 return ExprError();
1622 }
1623
1624 ExprResult Result(ParseAsmStringLiteral(ForAsmLabel));
1625
1626 if (!Result.isInvalid()) {
1627 // Close the paren and get the location of the end bracket
1628 T.consumeClose();
1629 if (EndLoc)
1630 *EndLoc = T.getCloseLocation();
1631 } else if (SkipUntil(T: tok::r_paren, Flags: StopAtSemi | StopBeforeMatch)) {
1632 if (EndLoc)
1633 *EndLoc = Tok.getLocation();
1634 ConsumeParen();
1635 }
1636
1637 return Result;
1638}
1639
1640TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1641 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1642 TemplateIdAnnotation *
1643 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1644 return Id;
1645}
1646
1647void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1648 // Push the current token back into the token stream (or revert it if it is
1649 // cached) and use an annotation scope token for current token.
1650 if (PP.isBacktrackEnabled())
1651 PP.RevertCachedTokens(N: 1);
1652 else
1653 PP.EnterToken(Tok, /*IsReinject=*/true);
1654 Tok.setKind(tok::annot_cxxscope);
1655 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1656 Tok.setAnnotationRange(SS.getRange());
1657
1658 // In case the tokens were cached, have Preprocessor replace them
1659 // with the annotation token. We don't need to do this if we've
1660 // just reverted back to a prior state.
1661 if (IsNewAnnotation)
1662 PP.AnnotateCachedTokens(Tok);
1663}
1664
1665AnnotatedNameKind
1666Parser::TryAnnotateName(CorrectionCandidateCallback *CCC,
1667 ImplicitTypenameContext AllowImplicitTypename) {
1668 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1669
1670 const bool EnteringContext = false;
1671 const bool WasScopeAnnotation = Tok.is(K: tok::annot_cxxscope);
1672
1673 CXXScopeSpec SS;
1674 if (getLangOpts().CPlusPlus &&
1675 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1676 /*ObjectHasErrors=*/false,
1677 EnteringContext))
1678 return AnnotatedNameKind::Error;
1679
1680 if (Tok.isNot(K: tok::identifier) || SS.isInvalid()) {
1681 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
1682 AllowImplicitTypename))
1683 return AnnotatedNameKind::Error;
1684 return AnnotatedNameKind::Unresolved;
1685 }
1686
1687 IdentifierInfo *Name = Tok.getIdentifierInfo();
1688 SourceLocation NameLoc = Tok.getLocation();
1689
1690 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1691 // typo-correct to tentatively-declared identifiers.
1692 if (isTentativelyDeclared(II: Name) && SS.isEmpty()) {
1693 // Identifier has been tentatively declared, and thus cannot be resolved as
1694 // an expression. Fall back to annotating it as a type.
1695 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
1696 AllowImplicitTypename))
1697 return AnnotatedNameKind::Error;
1698 return Tok.is(K: tok::annot_typename) ? AnnotatedNameKind::Success
1699 : AnnotatedNameKind::TentativeDecl;
1700 }
1701
1702 Token Next = NextToken();
1703
1704 // Look up and classify the identifier. We don't perform any typo-correction
1705 // after a scope specifier, because in general we can't recover from typos
1706 // there (eg, after correcting 'A::template B<X>::C' [sic], we would need to
1707 // jump back into scope specifier parsing).
1708 Sema::NameClassification Classification = Actions.ClassifyName(
1709 S: getCurScope(), SS, Name, NameLoc, NextToken: Next, CCC: SS.isEmpty() ? CCC : nullptr);
1710
1711 // If name lookup found nothing and we guessed that this was a template name,
1712 // double-check before committing to that interpretation. C++20 requires that
1713 // we interpret this as a template-id if it can be, but if it can't be, then
1714 // this is an error recovery case.
1715 if (Classification.getKind() == NameClassificationKind::UndeclaredTemplate &&
1716 isTemplateArgumentList(TokensToSkip: 1) == TPResult::False) {
1717 // It's not a template-id; re-classify without the '<' as a hint.
1718 Token FakeNext = Next;
1719 FakeNext.setKind(tok::unknown);
1720 Classification =
1721 Actions.ClassifyName(S: getCurScope(), SS, Name, NameLoc, NextToken: FakeNext,
1722 CCC: SS.isEmpty() ? CCC : nullptr);
1723 }
1724
1725 switch (Classification.getKind()) {
1726 case NameClassificationKind::Error:
1727 return AnnotatedNameKind::Error;
1728
1729 case NameClassificationKind::Keyword:
1730 // The identifier was typo-corrected to a keyword.
1731 Tok.setIdentifierInfo(Name);
1732 Tok.setKind(Name->getTokenID());
1733 PP.TypoCorrectToken(Tok);
1734 if (SS.isNotEmpty())
1735 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1736 // We've "annotated" this as a keyword.
1737 return AnnotatedNameKind::Success;
1738
1739 case NameClassificationKind::Unknown:
1740 // It's not something we know about. Leave it unannotated.
1741 break;
1742
1743 case NameClassificationKind::Type: {
1744 if (TryAltiVecVectorToken())
1745 // vector has been found as a type id when altivec is enabled but
1746 // this is followed by a declaration specifier so this is really the
1747 // altivec vector token. Leave it unannotated.
1748 break;
1749 SourceLocation BeginLoc = NameLoc;
1750 if (SS.isNotEmpty())
1751 BeginLoc = SS.getBeginLoc();
1752
1753 /// An Objective-C object type followed by '<' is a specialization of
1754 /// a parameterized class type or a protocol-qualified type.
1755 ParsedType Ty = Classification.getType();
1756 QualType T = Actions.GetTypeFromParser(Ty);
1757 if (getLangOpts().ObjC && NextToken().is(K: tok::less) &&
1758 (T->isObjCObjectType() || T->isObjCObjectPointerType())) {
1759 // Consume the name.
1760 SourceLocation IdentifierLoc = ConsumeToken();
1761 SourceLocation NewEndLoc;
1762 TypeResult NewType
1763 = parseObjCTypeArgsAndProtocolQualifiers(loc: IdentifierLoc, type: Ty,
1764 /*consumeLastToken=*/false,
1765 endLoc&: NewEndLoc);
1766 if (NewType.isUsable())
1767 Ty = NewType.get();
1768 else if (Tok.is(K: tok::eof)) // Nothing to do here, bail out...
1769 return AnnotatedNameKind::Error;
1770 }
1771
1772 Tok.setKind(tok::annot_typename);
1773 setTypeAnnotation(Tok, T: Ty);
1774 Tok.setAnnotationEndLoc(Tok.getLocation());
1775 Tok.setLocation(BeginLoc);
1776 PP.AnnotateCachedTokens(Tok);
1777 return AnnotatedNameKind::Success;
1778 }
1779
1780 case NameClassificationKind::OverloadSet:
1781 Tok.setKind(tok::annot_overload_set);
1782 setExprAnnotation(Tok, ER: Classification.getExpression());
1783 Tok.setAnnotationEndLoc(NameLoc);
1784 if (SS.isNotEmpty())
1785 Tok.setLocation(SS.getBeginLoc());
1786 PP.AnnotateCachedTokens(Tok);
1787 return AnnotatedNameKind::Success;
1788
1789 case NameClassificationKind::NonType:
1790 if (TryAltiVecVectorToken())
1791 // vector has been found as a non-type id when altivec is enabled but
1792 // this is followed by a declaration specifier so this is really the
1793 // altivec vector token. Leave it unannotated.
1794 break;
1795 Tok.setKind(tok::annot_non_type);
1796 setNonTypeAnnotation(Tok, ND: Classification.getNonTypeDecl());
1797 Tok.setLocation(NameLoc);
1798 Tok.setAnnotationEndLoc(NameLoc);
1799 PP.AnnotateCachedTokens(Tok);
1800 if (SS.isNotEmpty())
1801 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1802 return AnnotatedNameKind::Success;
1803
1804 case NameClassificationKind::UndeclaredNonType:
1805 case NameClassificationKind::DependentNonType:
1806 Tok.setKind(Classification.getKind() ==
1807 NameClassificationKind::UndeclaredNonType
1808 ? tok::annot_non_type_undeclared
1809 : tok::annot_non_type_dependent);
1810 setIdentifierAnnotation(Tok, ND: Name);
1811 Tok.setLocation(NameLoc);
1812 Tok.setAnnotationEndLoc(NameLoc);
1813 PP.AnnotateCachedTokens(Tok);
1814 if (SS.isNotEmpty())
1815 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1816 return AnnotatedNameKind::Success;
1817
1818 case NameClassificationKind::TypeTemplate:
1819 if (Next.isNot(K: tok::less)) {
1820 // This may be a type or variable template being used as a template
1821 // template argument.
1822 if (SS.isNotEmpty())
1823 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1824 return AnnotatedNameKind::TemplateName;
1825 }
1826 [[fallthrough]];
1827 case NameClassificationKind::Concept:
1828 case NameClassificationKind::VarTemplate:
1829 case NameClassificationKind::FunctionTemplate:
1830 case NameClassificationKind::UndeclaredTemplate: {
1831 bool IsConceptName =
1832 Classification.getKind() == NameClassificationKind::Concept;
1833 // We have a template name followed by '<'. Consume the identifier token so
1834 // we reach the '<' and annotate it.
1835 UnqualifiedId Id;
1836 Id.setIdentifier(Id: Name, IdLoc: NameLoc);
1837 if (Next.is(K: tok::less))
1838 ConsumeToken();
1839 if (AnnotateTemplateIdToken(
1840 Template: TemplateTy::make(P: Classification.getTemplateName()),
1841 TNK: Classification.getTemplateNameKind(), SS, TemplateKWLoc: SourceLocation(), TemplateName&: Id,
1842 /*AllowTypeAnnotation=*/!IsConceptName,
1843 /*TypeConstraint=*/IsConceptName))
1844 return AnnotatedNameKind::Error;
1845 if (SS.isNotEmpty())
1846 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1847 return AnnotatedNameKind::Success;
1848 }
1849 }
1850
1851 // Unable to classify the name, but maybe we can annotate a scope specifier.
1852 if (SS.isNotEmpty())
1853 AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1854 return AnnotatedNameKind::Unresolved;
1855}
1856
1857SourceLocation Parser::getEndOfPreviousToken() const {
1858 SourceLocation TokenEndLoc = PP.getLocForEndOfToken(Loc: PrevTokLocation);
1859 return TokenEndLoc.isValid() ? TokenEndLoc : Tok.getLocation();
1860}
1861
1862bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1863 assert(Tok.isNot(tok::identifier));
1864 IdentifierInfo *II = Tok.getIdentifierInfo();
1865
1866 // A token lexed and cached before an earlier fallback reverted this keyword
1867 // still carries the stale keyword kind; it is already an identifier.
1868 if (II->getTokenID() == tok::identifier) {
1869 Tok.setKind(tok::identifier);
1870 return true;
1871 }
1872
1873 Diag(Tok, DiagID: diag::ext_keyword_as_ident)
1874 << PP.getSpelling(Tok)
1875 << DisableKeyword;
1876 if (DisableKeyword)
1877 II->revertTokenIDToIdentifier();
1878 Tok.setKind(tok::identifier);
1879 return true;
1880}
1881
1882bool Parser::TryAnnotateTypeOrScopeToken(
1883 ImplicitTypenameContext AllowImplicitTypename, bool IsAddressOfOperand) {
1884 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1885 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1886 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1887 Tok.is(tok::kw___super) || Tok.is(tok::kw_auto) ||
1888 Tok.is(tok::annot_pack_indexing_type)) &&
1889 "Cannot be a type or scope token!");
1890
1891 if (Tok.is(K: tok::kw_typename)) {
1892 // MSVC lets you do stuff like:
1893 // typename typedef T_::D D;
1894 //
1895 // We will consume the typedef token here and put it back after we have
1896 // parsed the first identifier, transforming it into something more like:
1897 // typename T_::D typedef D;
1898 if (getLangOpts().MSVCCompat && NextToken().is(K: tok::kw_typedef)) {
1899 Token TypedefToken;
1900 PP.Lex(Result&: TypedefToken);
1901 bool Result = TryAnnotateTypeOrScopeToken(AllowImplicitTypename);
1902 PP.EnterToken(Tok, /*IsReinject=*/true);
1903 Tok = TypedefToken;
1904 if (!Result)
1905 Diag(Loc: Tok.getLocation(), DiagID: diag::warn_expected_qualified_after_typename);
1906 return Result;
1907 }
1908
1909 // Parse a C++ typename-specifier, e.g., "typename T::type".
1910 //
1911 // typename-specifier:
1912 // 'typename' '::' [opt] nested-name-specifier identifier
1913 // 'typename' '::' [opt] nested-name-specifier template [opt]
1914 // simple-template-id
1915 SourceLocation TypenameLoc = ConsumeToken();
1916 CXXScopeSpec SS;
1917 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1918 /*ObjectHasErrors=*/false,
1919 /*EnteringContext=*/false, MayBePseudoDestructor: nullptr,
1920 /*IsTypename*/ true))
1921 return true;
1922 if (SS.isEmpty()) {
1923 if (Tok.is(K: tok::identifier) || Tok.is(K: tok::annot_template_id) ||
1924 Tok.is(K: tok::annot_decltype)) {
1925 // Attempt to recover by skipping the invalid 'typename'
1926 if (Tok.is(K: tok::annot_decltype) ||
1927 (!TryAnnotateTypeOrScopeToken(AllowImplicitTypename) &&
1928 Tok.isAnnotation())) {
1929 unsigned DiagID = diag::err_expected_qualified_after_typename;
1930 // MS compatibility: MSVC permits using known types with typename.
1931 // e.g. "typedef typename T* pointer_type"
1932 if (getLangOpts().MicrosoftExt)
1933 DiagID = diag::warn_expected_qualified_after_typename;
1934 Diag(Loc: Tok.getLocation(), DiagID);
1935 return false;
1936 }
1937 }
1938 if (Tok.isEditorPlaceholder())
1939 return true;
1940
1941 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_qualified_after_typename);
1942 return true;
1943 }
1944
1945 bool TemplateKWPresent = false;
1946 if (Tok.is(K: tok::kw_template)) {
1947 ConsumeToken();
1948 TemplateKWPresent = true;
1949 }
1950
1951 TypeResult Ty;
1952 if (Tok.is(K: tok::identifier)) {
1953 if (TemplateKWPresent && NextToken().isNot(K: tok::less)) {
1954 Diag(Loc: Tok.getLocation(),
1955 DiagID: diag::missing_template_arg_list_after_template_kw);
1956 return true;
1957 }
1958 Ty = Actions.ActOnTypenameType(S: getCurScope(), TypenameLoc, SS,
1959 II: *Tok.getIdentifierInfo(),
1960 IdLoc: Tok.getLocation());
1961 } else if (Tok.is(K: tok::annot_template_id)) {
1962 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
1963 if (!TemplateId->mightBeType()) {
1964 Diag(Tok, DiagID: diag::err_typename_refers_to_non_type_template)
1965 << Tok.getAnnotationRange();
1966 return true;
1967 }
1968
1969 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1970 TemplateId->NumArgs);
1971
1972 Ty = TemplateId->isInvalid()
1973 ? TypeError()
1974 : Actions.ActOnTypenameType(
1975 S: getCurScope(), TypenameLoc, SS, TemplateLoc: TemplateId->TemplateKWLoc,
1976 TemplateName: TemplateId->Template, TemplateII: TemplateId->Name,
1977 TemplateIILoc: TemplateId->TemplateNameLoc, LAngleLoc: TemplateId->LAngleLoc,
1978 TemplateArgs: TemplateArgsPtr, RAngleLoc: TemplateId->RAngleLoc);
1979 } else {
1980 Diag(Tok, DiagID: diag::err_expected_type_name_after_typename)
1981 << SS.getRange();
1982 return true;
1983 }
1984
1985 SourceLocation EndLoc = Tok.getLastLoc();
1986 Tok.setKind(tok::annot_typename);
1987 setTypeAnnotation(Tok, T: Ty);
1988 Tok.setAnnotationEndLoc(EndLoc);
1989 Tok.setLocation(TypenameLoc);
1990 PP.AnnotateCachedTokens(Tok);
1991 return false;
1992 }
1993
1994 // Remembers whether the token was originally a scope annotation.
1995 bool WasScopeAnnotation = Tok.is(K: tok::annot_cxxscope);
1996
1997 CXXScopeSpec SS;
1998 if (getLangOpts().CPlusPlus)
1999 if (ParseOptionalCXXScopeSpecifier(
2000 SS, /*ObjectType=*/nullptr,
2001 /*ObjectHasErrors=*/false,
2002 /*EnteringContext=*/false,
2003 /*IsAddressOfOperand=*/IsAddressOfOperand))
2004 return true;
2005
2006 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
2007 AllowImplicitTypename);
2008}
2009
2010bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(
2011 CXXScopeSpec &SS, bool IsNewScope,
2012 ImplicitTypenameContext AllowImplicitTypename) {
2013 if (Tok.is(K: tok::identifier)) {
2014 // Determine whether the identifier is a type name.
2015 if (ParsedType Ty = Actions.getTypeName(
2016 II: *Tok.getIdentifierInfo(), NameLoc: Tok.getLocation(), S: getCurScope(), SS: &SS,
2017 isClassName: false, HasTrailingDot: NextToken().is(K: tok::period), ObjectType: nullptr,
2018 /*IsCtorOrDtorName=*/false,
2019 /*NonTrivialTypeSourceInfo=*/WantNontrivialTypeSourceInfo: true,
2020 /*IsClassTemplateDeductionContext=*/true, AllowImplicitTypename)) {
2021 SourceLocation BeginLoc = Tok.getLocation();
2022 if (SS.isNotEmpty()) // it was a C++ qualified type name.
2023 BeginLoc = SS.getBeginLoc();
2024
2025 QualType T = Actions.GetTypeFromParser(Ty);
2026
2027 /// An Objective-C object type followed by '<' is a specialization of
2028 /// a parameterized class type or a protocol-qualified type.
2029 if (getLangOpts().ObjC && NextToken().is(K: tok::less) &&
2030 (T->isObjCObjectType() || T->isObjCObjectPointerType())) {
2031 // Consume the name.
2032 SourceLocation IdentifierLoc = ConsumeToken();
2033 SourceLocation NewEndLoc;
2034 TypeResult NewType
2035 = parseObjCTypeArgsAndProtocolQualifiers(loc: IdentifierLoc, type: Ty,
2036 /*consumeLastToken=*/false,
2037 endLoc&: NewEndLoc);
2038 if (NewType.isUsable())
2039 Ty = NewType.get();
2040 else if (Tok.is(K: tok::eof)) // Nothing to do here, bail out...
2041 return false;
2042 }
2043
2044 // This is a typename. Replace the current token in-place with an
2045 // annotation type token.
2046 Tok.setKind(tok::annot_typename);
2047 setTypeAnnotation(Tok, T: Ty);
2048 Tok.setAnnotationEndLoc(Tok.getLocation());
2049 Tok.setLocation(BeginLoc);
2050
2051 // In case the tokens were cached, have Preprocessor replace
2052 // them with the annotation token.
2053 PP.AnnotateCachedTokens(Tok);
2054 return false;
2055 }
2056
2057 if (!getLangOpts().CPlusPlus) {
2058 // If we're in C, the only place we can have :: tokens is C23
2059 // attribute which is parsed elsewhere. If the identifier is not a type,
2060 // then it can't be scope either, just early exit.
2061 return false;
2062 }
2063
2064 // If this is a template-id, annotate with a template-id or type token.
2065 // FIXME: This appears to be dead code. We already have formed template-id
2066 // tokens when parsing the scope specifier; this can never form a new one.
2067 if (NextToken().is(K: tok::less)) {
2068 TemplateTy Template;
2069 UnqualifiedId TemplateName;
2070 TemplateName.setIdentifier(Id: Tok.getIdentifierInfo(), IdLoc: Tok.getLocation());
2071 bool MemberOfUnknownSpecialization;
2072 if (TemplateNameKind TNK = Actions.isTemplateName(
2073 S: getCurScope(), SS,
2074 /*hasTemplateKeyword=*/false, Name: TemplateName,
2075 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
2076 MemberOfUnknownSpecialization)) {
2077 // Only annotate an undeclared template name as a template-id if the
2078 // following tokens have the form of a template argument list.
2079 if (TNK != TNK_Undeclared_template ||
2080 isTemplateArgumentList(TokensToSkip: 1) != TPResult::False) {
2081 // Consume the identifier.
2082 ConsumeToken();
2083 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateKWLoc: SourceLocation(),
2084 TemplateName)) {
2085 // If an unrecoverable error occurred, we need to return true here,
2086 // because the token stream is in a damaged state. We may not
2087 // return a valid identifier.
2088 return true;
2089 }
2090 }
2091 }
2092 }
2093
2094 // The current token, which is either an identifier or a
2095 // template-id, is not part of the annotation. Fall through to
2096 // push that token back into the stream and complete the C++ scope
2097 // specifier annotation.
2098 }
2099
2100 if (Tok.is(K: tok::annot_template_id)) {
2101 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
2102 if (TemplateId->Kind == TNK_Type_template) {
2103 // A template-id that refers to a type was parsed into a
2104 // template-id annotation in a context where we weren't allowed
2105 // to produce a type annotation token. Update the template-id
2106 // annotation token to a type annotation token now.
2107 AnnotateTemplateIdTokenAsType(SS, AllowImplicitTypename);
2108 return false;
2109 }
2110 }
2111
2112 if (SS.isEmpty()) {
2113 if (getLangOpts().ObjC && !getLangOpts().CPlusPlus &&
2114 Tok.is(K: tok::coloncolon)) {
2115 // ObjectiveC does not allow :: as as a scope token.
2116 Diag(Loc: ConsumeToken(), DiagID: diag::err_expected_type);
2117 return true;
2118 }
2119 return false;
2120 }
2121
2122 // A C++ scope specifier that isn't followed by a typename.
2123 AnnotateScopeToken(SS, IsNewAnnotation: IsNewScope);
2124 return false;
2125}
2126
2127bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
2128 assert(getLangOpts().CPlusPlus &&
2129 "Call sites of this function should be guarded by checking for C++");
2130 assert(MightBeCXXScopeToken() && "Cannot be a type or scope token!");
2131
2132 CXXScopeSpec SS;
2133 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
2134 /*ObjectHasErrors=*/false,
2135 EnteringContext))
2136 return true;
2137 if (SS.isEmpty())
2138 return false;
2139
2140 AnnotateScopeToken(SS, IsNewAnnotation: true);
2141 return false;
2142}
2143
2144bool Parser::isTokenEqualOrEqualTypo() {
2145 tok::TokenKind Kind = Tok.getKind();
2146 switch (Kind) {
2147 default:
2148 return false;
2149 case tok::ampequal: // &=
2150 case tok::starequal: // *=
2151 case tok::plusequal: // +=
2152 case tok::minusequal: // -=
2153 case tok::exclaimequal: // !=
2154 case tok::slashequal: // /=
2155 case tok::percentequal: // %=
2156 case tok::lessequal: // <=
2157 case tok::lesslessequal: // <<=
2158 case tok::greaterequal: // >=
2159 case tok::greatergreaterequal: // >>=
2160 case tok::caretequal: // ^=
2161 case tok::pipeequal: // |=
2162 case tok::equalequal: // ==
2163 Diag(Tok, DiagID: diag::err_invalid_token_after_declarator_suggest_equal)
2164 << Kind
2165 << FixItHint::CreateReplacement(RemoveRange: SourceRange(Tok.getLocation()), Code: "=");
2166 [[fallthrough]];
2167 case tok::equal:
2168 return true;
2169 }
2170}
2171
2172SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
2173 assert(Tok.is(tok::code_completion));
2174 PrevTokLocation = Tok.getLocation();
2175
2176 for (Scope *S = getCurScope(); S; S = S->getParent()) {
2177 if (S->isFunctionScope()) {
2178 cutOffParsing();
2179 Actions.CodeCompletion().CodeCompleteOrdinaryName(
2180 S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_RecoveryInFunction);
2181 return PrevTokLocation;
2182 }
2183
2184 if (S->isClassScope()) {
2185 cutOffParsing();
2186 Actions.CodeCompletion().CodeCompleteOrdinaryName(
2187 S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_Class);
2188 return PrevTokLocation;
2189 }
2190 }
2191
2192 cutOffParsing();
2193 Actions.CodeCompletion().CodeCompleteOrdinaryName(
2194 S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_Namespace);
2195 return PrevTokLocation;
2196}
2197
2198// Code-completion pass-through functions
2199
2200void Parser::CodeCompleteDirective(bool InConditional) {
2201 Actions.CodeCompletion().CodeCompletePreprocessorDirective(InConditional);
2202}
2203
2204void Parser::CodeCompleteInConditionalExclusion() {
2205 Actions.CodeCompletion().CodeCompleteInPreprocessorConditionalExclusion(
2206 S: getCurScope());
2207}
2208
2209void Parser::CodeCompleteMacroName(bool IsDefinition) {
2210 Actions.CodeCompletion().CodeCompletePreprocessorMacroName(IsDefinition);
2211}
2212
2213void Parser::CodeCompletePreprocessorExpression() {
2214 Actions.CodeCompletion().CodeCompletePreprocessorExpression();
2215}
2216
2217void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
2218 MacroInfo *MacroInfo,
2219 unsigned ArgumentIndex) {
2220 Actions.CodeCompletion().CodeCompletePreprocessorMacroArgument(
2221 S: getCurScope(), Macro, MacroInfo, Argument: ArgumentIndex);
2222}
2223
2224void Parser::CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {
2225 Actions.CodeCompletion().CodeCompleteIncludedFile(Dir, IsAngled);
2226}
2227
2228void Parser::CodeCompleteNaturalLanguage() {
2229 Actions.CodeCompletion().CodeCompleteNaturalLanguage();
2230}
2231
2232void Parser::CodeCompleteModuleImport(SourceLocation ImportLoc,
2233 ModuleIdPath Path) {
2234 Actions.CodeCompletion().CodeCompleteModuleImport(ImportLoc, Path);
2235}
2236
2237bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
2238 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
2239 "Expected '__if_exists' or '__if_not_exists'");
2240 Result.IsIfExists = Tok.is(K: tok::kw___if_exists);
2241 Result.KeywordLoc = ConsumeToken();
2242
2243 BalancedDelimiterTracker T(*this, tok::l_paren);
2244 if (T.consumeOpen()) {
2245 Diag(Tok, DiagID: diag::err_expected_lparen_after)
2246 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
2247 return true;
2248 }
2249
2250 // Parse nested-name-specifier.
2251 if (getLangOpts().CPlusPlus)
2252 ParseOptionalCXXScopeSpecifier(SS&: Result.SS, /*ObjectType=*/nullptr,
2253 /*ObjectHasErrors=*/false,
2254 /*EnteringContext=*/false);
2255
2256 // Check nested-name specifier.
2257 if (Result.SS.isInvalid()) {
2258 T.skipToEnd();
2259 return true;
2260 }
2261
2262 // Parse the unqualified-id.
2263 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
2264 if (ParseUnqualifiedId(SS&: Result.SS, /*ObjectType=*/nullptr,
2265 /*ObjectHadErrors=*/false, /*EnteringContext*/ false,
2266 /*AllowDestructorName*/ true,
2267 /*AllowConstructorName*/ true,
2268 /*AllowDeductionGuide*/ false, TemplateKWLoc: &TemplateKWLoc,
2269 Result&: Result.Name)) {
2270 T.skipToEnd();
2271 return true;
2272 }
2273
2274 if (T.consumeClose())
2275 return true;
2276
2277 // Check if the symbol exists.
2278 switch (Actions.CheckMicrosoftIfExistsSymbol(S: getCurScope(), KeywordLoc: Result.KeywordLoc,
2279 IsIfExists: Result.IsIfExists, SS&: Result.SS,
2280 Name&: Result.Name)) {
2281 case IfExistsResult::Exists:
2282 Result.Behavior =
2283 Result.IsIfExists ? IfExistsBehavior::Parse : IfExistsBehavior::Skip;
2284 break;
2285
2286 case IfExistsResult::DoesNotExist:
2287 Result.Behavior =
2288 !Result.IsIfExists ? IfExistsBehavior::Parse : IfExistsBehavior::Skip;
2289 break;
2290
2291 case IfExistsResult::Dependent:
2292 Result.Behavior = IfExistsBehavior::Dependent;
2293 break;
2294
2295 case IfExistsResult::Error:
2296 return true;
2297 }
2298
2299 return false;
2300}
2301
2302void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2303 IfExistsCondition Result;
2304 if (ParseMicrosoftIfExistsCondition(Result))
2305 return;
2306
2307 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2308 if (Braces.consumeOpen()) {
2309 Diag(Tok, DiagID: diag::err_expected) << tok::l_brace;
2310 return;
2311 }
2312
2313 switch (Result.Behavior) {
2314 case IfExistsBehavior::Parse:
2315 // Parse declarations below.
2316 break;
2317
2318 case IfExistsBehavior::Dependent:
2319 llvm_unreachable("Cannot have a dependent external declaration");
2320
2321 case IfExistsBehavior::Skip:
2322 Braces.skipToEnd();
2323 return;
2324 }
2325
2326 // Parse the declarations.
2327 // FIXME: Support module import within __if_exists?
2328 while (Tok.isNot(K: tok::r_brace) && !isEofOrEom()) {
2329 ParsedAttributes Attrs(AttrFactory);
2330 MaybeParseCXX11Attributes(Attrs);
2331 ParsedAttributes EmptyDeclSpecAttrs(AttrFactory);
2332 DeclGroupPtrTy Result = ParseExternalDeclaration(Attrs, DeclSpecAttrs&: EmptyDeclSpecAttrs);
2333 if (Result && !getCurScope()->getParent())
2334 Actions.getASTConsumer().HandleTopLevelDecl(D: Result.get());
2335 }
2336 Braces.consumeClose();
2337}
2338
2339Parser::DeclGroupPtrTy
2340Parser::ParseModuleDecl(Sema::ModuleImportState &ImportState) {
2341 Token Introducer = Tok;
2342 SourceLocation StartLoc = Introducer.getLocation();
2343
2344 Sema::ModuleDeclKind MDK = TryConsumeToken(Expected: tok::kw_export)
2345 ? Sema::ModuleDeclKind::Interface
2346 : Sema::ModuleDeclKind::Implementation;
2347
2348 assert(Tok.is(tok::kw_module) && "not a module declaration");
2349
2350 SourceLocation ModuleLoc = ConsumeToken();
2351
2352 // Attributes appear after the module name, not before.
2353 // FIXME: Suggest moving the attributes later with a fixit.
2354 DiagnoseAndSkipCXX11Attributes();
2355
2356 // Parse a global-module-fragment, if present.
2357 if (getLangOpts().CPlusPlusModules && Tok.is(K: tok::semi)) {
2358 SourceLocation SemiLoc = ConsumeToken();
2359 if (ImportState != Sema::ModuleImportState::FirstDecl ||
2360 Introducer.hasSeenNoTrivialPPDirective()) {
2361 Diag(Loc: StartLoc, DiagID: diag::err_global_module_introducer_not_at_start)
2362 << SourceRange(StartLoc, SemiLoc);
2363 return nullptr;
2364 }
2365 if (MDK == Sema::ModuleDeclKind::Interface) {
2366 Diag(Loc: StartLoc, DiagID: diag::err_module_fragment_exported)
2367 << /*global*/0 << FixItHint::CreateRemoval(RemoveRange: StartLoc);
2368 }
2369 ImportState = Sema::ModuleImportState::GlobalFragment;
2370 return Actions.ActOnGlobalModuleFragmentDecl(ModuleLoc);
2371 }
2372
2373 // Parse a private-module-fragment, if present.
2374 if (getLangOpts().CPlusPlusModules && Tok.is(K: tok::colon) &&
2375 NextToken().is(K: tok::kw_private)) {
2376 if (MDK == Sema::ModuleDeclKind::Interface) {
2377 Diag(Loc: StartLoc, DiagID: diag::err_module_fragment_exported)
2378 << /*private*/1 << FixItHint::CreateRemoval(RemoveRange: StartLoc);
2379 }
2380 ConsumeToken();
2381 SourceLocation PrivateLoc = ConsumeToken();
2382 DiagnoseAndSkipCXX11Attributes();
2383 ExpectAndConsumeSemi(DiagID: diag::err_private_module_fragment_expected_semi);
2384 auto Result = Actions.ActOnPrivateModuleFragmentDecl(ModuleLoc, PrivateLoc);
2385 if (Result) {
2386 ImportState =
2387 ImportState == Sema::ModuleImportState::ImportAllowed
2388 ? Sema::ModuleImportState::PrivateFragmentImportAllowed
2389 : Sema::ModuleImportState::PrivateFragmentImportFinished;
2390 }
2391 return nullptr;
2392 }
2393 SmallVector<IdentifierLoc, 2> Path;
2394 if (ParseModuleName(UseLoc: ModuleLoc, Path, /*IsImport*/ false))
2395 return nullptr;
2396
2397 // Parse the optional module-partition.
2398 SmallVector<IdentifierLoc, 2> Partition;
2399 if (Tok.is(K: tok::colon)) {
2400 SourceLocation ColonLoc = ConsumeToken();
2401 if (!getLangOpts().CPlusPlusModules)
2402 Diag(Loc: ColonLoc, DiagID: diag::err_unsupported_module_partition)
2403 << SourceRange(ColonLoc, Partition.back().getLoc());
2404 // Recover by ignoring the partition name.
2405 else if (ParseModuleName(UseLoc: ModuleLoc, Path&: Partition, /*IsImport*/ false))
2406 return nullptr;
2407 }
2408
2409 if (Tok.isNoneOf(Ks: tok::semi, Ks: tok::l_square, Ks: tok::eof)) {
2410 Diag(Tok, DiagID: diag::err_unexpected_tok_after_module_name)
2411 << PP.getSpelling(Tok);
2412 SkipUntil(T: tok::semi, Flags: SkipUntilFlags::StopBeforeMatch);
2413 }
2414
2415 // We don't support any module attributes yet; just parse them and diagnose.
2416 ParsedAttributes Attrs(AttrFactory);
2417 MaybeParseCXX11Attributes(Attrs);
2418 ProhibitCXX11Attributes(Attrs, AttrDiagID: diag::err_attribute_not_module_attr,
2419 KeywordDiagId: diag::err_keyword_not_module_attr,
2420 /*DiagnoseEmptyAttrs=*/false,
2421 /*WarnOnUnknownAttrs=*/true);
2422
2423 if (ExpectAndConsumeSemi(DiagID: diag::err_expected_semi_after_module_or_import,
2424 TokenUsed: tok::getKeywordSpelling(Kind: tok::kw_module)))
2425 SkipUntil(T: tok::semi);
2426
2427 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path, Partition,
2428 ImportState,
2429 SeenNoTrivialPPDirective: Introducer.hasSeenNoTrivialPPDirective());
2430}
2431
2432Decl *Parser::ParseModuleImport(SourceLocation AtLoc,
2433 Sema::ModuleImportState &ImportState) {
2434 SourceLocation StartLoc = AtLoc.isInvalid() ? Tok.getLocation() : AtLoc;
2435
2436 SourceLocation ExportLoc;
2437 TryConsumeToken(Expected: tok::kw_export, Loc&: ExportLoc);
2438
2439 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2440 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2441 "Improper start to module import");
2442 bool IsObjCAtImport = Tok.isObjCAtKeyword(objcKey: tok::objc_import);
2443 SourceLocation ImportLoc = ConsumeToken();
2444
2445 // For C++20 modules, we can have "name" or ":Partition name" as valid input.
2446 SmallVector<IdentifierLoc, 2> Path;
2447 bool IsPartition = false;
2448 Module *HeaderUnit = nullptr;
2449 if (Tok.is(K: tok::header_name)) {
2450 // This is a header import that the preprocessor decided we should skip
2451 // because it was malformed in some way. Parse and ignore it; it's already
2452 // been diagnosed.
2453 ConsumeToken();
2454 } else if (Tok.is(K: tok::annot_header_unit)) {
2455 // This is a header import that the preprocessor mapped to a module import.
2456 HeaderUnit = reinterpret_cast<Module *>(Tok.getAnnotationValue());
2457 ConsumeAnnotationToken();
2458 } else if (Tok.is(K: tok::colon)) {
2459 SourceLocation ColonLoc = ConsumeToken();
2460 if (!getLangOpts().CPlusPlusModules)
2461 Diag(Loc: ColonLoc, DiagID: diag::err_unsupported_module_partition)
2462 << SourceRange(ColonLoc, Path.back().getLoc());
2463 // Recover by leaving partition empty.
2464 else if (ParseModuleName(UseLoc: ColonLoc, Path, /*IsImport=*/true))
2465 return nullptr;
2466 else
2467 IsPartition = true;
2468 } else {
2469 if (ParseModuleName(UseLoc: ImportLoc, Path, /*IsImport=*/true))
2470 return nullptr;
2471 }
2472
2473 ParsedAttributes Attrs(AttrFactory);
2474 MaybeParseCXX11Attributes(Attrs);
2475 // We don't support any module import attributes yet.
2476 ProhibitCXX11Attributes(Attrs, AttrDiagID: diag::err_attribute_not_import_attr,
2477 KeywordDiagId: diag::err_keyword_not_import_attr,
2478 /*DiagnoseEmptyAttrs=*/false,
2479 /*WarnOnUnknownAttrs=*/true);
2480
2481 // Clang modules can inject token streams while loading, so a fatal loader
2482 // failure must stop parsing. C++20 named module imports are ordinary
2483 // declarations, and a prior failed import should not hide later diagnostics.
2484 bool IsCXX20NamedModuleImport =
2485 getLangOpts().CPlusPlusModules && !IsObjCAtImport && !Path.empty();
2486
2487 if (PP.hadModuleLoaderFatalFailure() && !IsCXX20NamedModuleImport) {
2488 // With a fatal failure in the module loader, we abort parsing.
2489 cutOffParsing();
2490 return nullptr;
2491 }
2492
2493 // Diagnose mis-imports.
2494 bool SeenError = true;
2495 switch (ImportState) {
2496 case Sema::ModuleImportState::ImportAllowed:
2497 SeenError = false;
2498 break;
2499 case Sema::ModuleImportState::FirstDecl:
2500 // If we found an import decl as the first declaration, we must be not in
2501 // a C++20 module unit or we are in an invalid state.
2502 ImportState = Sema::ModuleImportState::NotACXX20Module;
2503 [[fallthrough]];
2504 case Sema::ModuleImportState::NotACXX20Module:
2505 // We can only import a partition within a module purview.
2506 if (IsPartition)
2507 Diag(Loc: ImportLoc, DiagID: diag::err_partition_import_outside_module);
2508 else
2509 SeenError = false;
2510 break;
2511 case Sema::ModuleImportState::GlobalFragment:
2512 case Sema::ModuleImportState::PrivateFragmentImportAllowed:
2513 // We can only have pre-processor directives in the global module fragment
2514 // which allows pp-import, but not of a partition (since the global module
2515 // does not have partitions).
2516 // We cannot import a partition into a private module fragment, since
2517 // [module.private.frag]/1 disallows private module fragments in a multi-
2518 // TU module.
2519 if (IsPartition || (HeaderUnit && HeaderUnit->Kind !=
2520 Module::ModuleKind::ModuleHeaderUnit))
2521 Diag(Loc: ImportLoc, DiagID: diag::err_import_in_wrong_fragment)
2522 << IsPartition
2523 << (ImportState == Sema::ModuleImportState::GlobalFragment ? 0 : 1);
2524 else
2525 SeenError = false;
2526 break;
2527 case Sema::ModuleImportState::ImportFinished:
2528 case Sema::ModuleImportState::PrivateFragmentImportFinished:
2529 if (getLangOpts().CPlusPlusModules)
2530 Diag(Loc: ImportLoc, DiagID: diag::err_import_not_allowed_here);
2531 else
2532 SeenError = false;
2533 break;
2534 }
2535
2536 // FIXME: If the previous token is tok::header_name like the following:
2537 //
2538 // import <%%>
2539 //
2540 // The diagnostic location is incorrect.
2541 //
2542 // <source file>:1:10: error: import directive must end with a ';'
2543 // 1 | import <%%>
2544 // | ^
2545 // | ;
2546 bool LexedSemi = false;
2547 if (getLangOpts().CPlusPlusModules)
2548 LexedSemi =
2549 !ExpectAndConsumeSemi(DiagID: diag::err_expected_semi_after_module_or_import,
2550 TokenUsed: tok::getKeywordSpelling(Kind: tok::kw_import));
2551 else
2552 LexedSemi = !ExpectAndConsumeSemi(DiagID: diag::err_module_expected_semi);
2553
2554 if (!LexedSemi)
2555 SkipUntil(T: tok::semi);
2556
2557 if (SeenError)
2558 return nullptr;
2559
2560 DeclResult Import;
2561 if (HeaderUnit)
2562 Import =
2563 Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, M: HeaderUnit);
2564 else if (!Path.empty())
2565 Import = Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, Path,
2566 IsPartition);
2567 if (Import.isInvalid())
2568 return nullptr;
2569
2570 // Using '@import' in framework headers requires modules to be enabled so that
2571 // the header is parseable. Emit a warning to make the user aware.
2572 if (IsObjCAtImport && AtLoc.isValid()) {
2573 auto &SrcMgr = PP.getSourceManager();
2574 auto FE = SrcMgr.getFileEntryRefForID(FID: SrcMgr.getFileID(SpellingLoc: AtLoc));
2575 if (FE && llvm::sys::path::parent_path(path: FE->getDir().getName())
2576 .ends_with(Suffix: ".framework"))
2577 Diags.Report(Loc: AtLoc, DiagID: diag::warn_atimport_in_framework_header);
2578 }
2579
2580 return Import.get();
2581}
2582
2583bool Parser::ParseModuleName(SourceLocation UseLoc,
2584 SmallVectorImpl<IdentifierLoc> &Path,
2585 bool IsImport) {
2586 if (Tok.isNot(K: tok::annot_module_name)) {
2587 SkipUntil(T: tok::semi);
2588 return true;
2589 }
2590 ModuleNameLoc *NameLoc =
2591 static_cast<ModuleNameLoc *>(Tok.getAnnotationValue());
2592 Path.assign(in_start: NameLoc->getModuleIdPath().begin(),
2593 in_end: NameLoc->getModuleIdPath().end());
2594 ConsumeAnnotationToken();
2595 return false;
2596}
2597
2598bool Parser::parseMisplacedModuleImport() {
2599 while (true) {
2600 switch (Tok.getKind()) {
2601 case tok::annot_module_end:
2602 // If we recovered from a misplaced module begin, we expect to hit a
2603 // misplaced module end too. Stay in the current context when this
2604 // happens.
2605 if (MisplacedModuleBeginCount) {
2606 --MisplacedModuleBeginCount;
2607 Actions.ActOnAnnotModuleEnd(
2608 DirectiveLoc: Tok.getLocation(),
2609 Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2610 ConsumeAnnotationToken();
2611 continue;
2612 }
2613 // Inform caller that recovery failed, the error must be handled at upper
2614 // level. This will generate the desired "missing '}' at end of module"
2615 // diagnostics on the way out.
2616 return true;
2617 case tok::annot_module_begin:
2618 // Recover by entering the module (Sema will diagnose).
2619 Actions.ActOnAnnotModuleBegin(
2620 DirectiveLoc: Tok.getLocation(),
2621 Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2622 ConsumeAnnotationToken();
2623 ++MisplacedModuleBeginCount;
2624 continue;
2625 case tok::annot_module_include:
2626 // Module import found where it should not be, for instance, inside a
2627 // namespace. Recover by importing the module.
2628 Actions.ActOnAnnotModuleInclude(
2629 DirectiveLoc: Tok.getLocation(),
2630 Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2631 ConsumeAnnotationToken();
2632 // If there is another module import, process it.
2633 continue;
2634 default:
2635 return false;
2636 }
2637 }
2638 return false;
2639}
2640
2641void Parser::diagnoseUseOfC11Keyword(const Token &Tok) {
2642 // Warn that this is a C11 extension if in an older mode or if in C++.
2643 // Otherwise, warn that it is incompatible with standards before C11 if in
2644 // C11 or later.
2645 Diag(Tok, DiagID: getLangOpts().C11 ? diag::warn_c11_compat_keyword
2646 : diag::ext_c11_feature)
2647 << Tok.getName();
2648}
2649
2650bool BalancedDelimiterTracker::diagnoseOverflow() {
2651 P.Diag(Tok: P.Tok, DiagID: diag::err_bracket_depth_exceeded)
2652 << P.getLangOpts().BracketDepth;
2653 P.Diag(Tok: P.Tok, DiagID: diag::note_bracket_depth);
2654 P.cutOffParsing();
2655 return true;
2656}
2657
2658bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2659 const char *Msg,
2660 tok::TokenKind SkipToTok) {
2661 LOpen = P.Tok.getLocation();
2662 if (P.ExpectAndConsume(ExpectedTok: Kind, DiagID, Msg)) {
2663 if (SkipToTok != tok::unknown)
2664 P.SkipUntil(T: SkipToTok, Flags: Parser::StopAtSemi);
2665 return true;
2666 }
2667
2668 if (getDepth() < P.getLangOpts().BracketDepth)
2669 return false;
2670
2671 return diagnoseOverflow();
2672}
2673
2674bool BalancedDelimiterTracker::diagnoseMissingClose() {
2675 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2676
2677 if (P.Tok.is(K: tok::annot_module_end))
2678 P.Diag(Tok: P.Tok, DiagID: diag::err_missing_before_module_end) << Close;
2679 else
2680 P.Diag(Tok: P.Tok, DiagID: diag::err_expected) << Close;
2681 P.Diag(Loc: LOpen, DiagID: diag::note_matching) << Kind;
2682
2683 // If we're not already at some kind of closing bracket, skip to our closing
2684 // token.
2685 if (P.Tok.isNot(K: tok::r_paren) && P.Tok.isNot(K: tok::r_brace) &&
2686 P.Tok.isNot(K: tok::r_square) &&
2687 P.SkipUntil(T1: Close, T2: FinalToken,
2688 Flags: Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2689 P.Tok.is(K: Close))
2690 LClose = P.ConsumeAnyToken();
2691 return true;
2692}
2693
2694void BalancedDelimiterTracker::skipToEnd() {
2695 P.SkipUntil(T: Close, Flags: Parser::StopBeforeMatch);
2696 consumeClose();
2697}
2698