1//===--- ParseInit.cpp - Initializer Parsing ------------------------------===//
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 initializer parsing as specified by C99 6.7.8.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Basic/DiagnosticParse.h"
14#include "clang/Basic/TokenKinds.h"
15#include "clang/Parse/Parser.h"
16#include "clang/Parse/RAIIObjectsForParser.h"
17#include "clang/Sema/Designator.h"
18#include "clang/Sema/EnterExpressionEvaluationContext.h"
19#include "clang/Sema/Ownership.h"
20#include "clang/Sema/Scope.h"
21#include "clang/Sema/SemaCodeCompletion.h"
22#include "clang/Sema/SemaObjC.h"
23using namespace clang;
24
25bool Parser::MayBeDesignationStart() {
26 switch (Tok.getKind()) {
27 default:
28 return false;
29
30 case tok::period: // designator: '.' identifier
31 return true;
32
33 case tok::l_square: { // designator: array-designator
34 if (!PP.getLangOpts().CPlusPlus)
35 return true;
36
37 // C++11 lambda expressions and C99 designators can be ambiguous all the
38 // way through the closing ']' and to the next character. Handle the easy
39 // cases here, and fall back to tentative parsing if those fail.
40 switch (PP.LookAhead(N: 0).getKind()) {
41 case tok::equal:
42 case tok::ellipsis:
43 case tok::r_square:
44 // Definitely starts a lambda expression.
45 return false;
46
47 case tok::amp:
48 case tok::kw_this:
49 case tok::star:
50 case tok::identifier:
51 // We have to do additional analysis, because these could be the
52 // start of a constant expression or a lambda capture list.
53 break;
54
55 default:
56 // Anything not mentioned above cannot occur following a '[' in a
57 // lambda expression.
58 return true;
59 }
60
61 // Handle the complicated case below.
62 break;
63 }
64 case tok::identifier: // designation: identifier ':'
65 return PP.LookAhead(N: 0).is(K: tok::colon);
66 }
67
68 // Parse up to (at most) the token after the closing ']' to determine
69 // whether this is a C99 designator or a lambda.
70 RevertingTentativeParsingAction Tentative(*this);
71
72 LambdaIntroducer Intro;
73 LambdaIntroducerTentativeParse ParseResult;
74 if (ParseLambdaIntroducer(Intro, Tentative: &ParseResult)) {
75 // Hit and diagnosed an error in a lambda.
76 // FIXME: Tell the caller this happened so they can recover.
77 return true;
78 }
79
80 switch (ParseResult) {
81 case LambdaIntroducerTentativeParse::Success:
82 case LambdaIntroducerTentativeParse::Incomplete:
83 // Might be a lambda-expression. Keep looking.
84 // FIXME: If our tentative parse was not incomplete, parse the lambda from
85 // here rather than throwing away then reparsing the LambdaIntroducer.
86 break;
87
88 case LambdaIntroducerTentativeParse::MessageSend:
89 case LambdaIntroducerTentativeParse::Invalid:
90 // Can't be a lambda-expression. Treat it as a designator.
91 // FIXME: Should we disambiguate against a message-send?
92 return true;
93 }
94
95 // Once we hit the closing square bracket, we look at the next
96 // token. If it's an '=', this is a designator. Otherwise, it's a
97 // lambda expression. This decision favors lambdas over the older
98 // GNU designator syntax, which allows one to omit the '=', but is
99 // consistent with GCC.
100 return Tok.is(K: tok::equal);
101}
102
103static void CheckArrayDesignatorSyntax(Parser &P, SourceLocation Loc,
104 Designation &Desig) {
105 // If we have exactly one array designator, this used the GNU
106 // 'designation: array-designator' extension, otherwise there should be no
107 // designators at all!
108 if (Desig.getNumDesignators() == 1 &&
109 (Desig.getDesignator(Idx: 0).isArrayDesignator() ||
110 Desig.getDesignator(Idx: 0).isArrayRangeDesignator()))
111 P.Diag(Loc, DiagID: diag::ext_gnu_missing_equal_designator);
112 else if (Desig.getNumDesignators() > 0)
113 P.Diag(Loc, DiagID: diag::err_expected_equal_designator);
114}
115
116ExprResult Parser::ParseInitializerWithPotentialDesignator(
117 DesignatorCompletionInfo DesignatorCompletion) {
118 // If this is the old-style GNU extension:
119 // designation ::= identifier ':'
120 // Handle it as a field designator. Otherwise, this must be the start of a
121 // normal expression.
122 if (Tok.is(K: tok::identifier)) {
123 const IdentifierInfo *FieldName = Tok.getIdentifierInfo();
124
125 SmallString<256> NewSyntax;
126 llvm::raw_svector_ostream(NewSyntax) << '.' << FieldName->getName()
127 << " = ";
128
129 SourceLocation NameLoc = ConsumeToken(); // Eat the identifier.
130
131 assert(Tok.is(tok::colon) && "MayBeDesignationStart not working properly!");
132 SourceLocation ColonLoc = ConsumeToken();
133
134 Diag(Loc: NameLoc, DiagID: diag::ext_gnu_old_style_field_designator)
135 << FixItHint::CreateReplacement(RemoveRange: SourceRange(NameLoc, ColonLoc),
136 Code: NewSyntax);
137
138 Designation D;
139 D.AddDesignator(D: Designator::CreateFieldDesignator(
140 FieldName, DotLoc: SourceLocation(), FieldLoc: NameLoc));
141 PreferredType.enterDesignatedInitializer(
142 Tok: Tok.getLocation(), BaseType: DesignatorCompletion.PreferredBaseType, D);
143 return Actions.ActOnDesignatedInitializer(Desig&: D, EqualOrColonLoc: ColonLoc, GNUSyntax: true,
144 Init: ParseInitializer());
145 }
146
147 // Desig - This is initialized when we see our first designator. We may have
148 // an objc message send with no designator, so we don't want to create this
149 // eagerly.
150 Designation Desig;
151
152 // Parse each designator in the designator list until we find an initializer.
153 while (Tok.is(K: tok::period) || Tok.is(K: tok::l_square)) {
154 if (Tok.is(K: tok::period)) {
155 // designator: '.' identifier
156 SourceLocation DotLoc = ConsumeToken();
157
158 if (Tok.is(K: tok::code_completion)) {
159 cutOffParsing();
160 Actions.CodeCompletion().CodeCompleteDesignator(
161 BaseType: DesignatorCompletion.PreferredBaseType,
162 InitExprs: DesignatorCompletion.InitExprs, D: Desig);
163 return ExprError();
164 }
165 if (Tok.isNot(K: tok::identifier)) {
166 Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_field_designator);
167 return ExprError();
168 }
169
170 Desig.AddDesignator(D: Designator::CreateFieldDesignator(
171 FieldName: Tok.getIdentifierInfo(), DotLoc, FieldLoc: Tok.getLocation()));
172 ConsumeToken(); // Eat the identifier.
173 continue;
174 }
175
176 // We must have either an array designator now or an objc message send.
177 assert(Tok.is(tok::l_square) && "Unexpected token!");
178
179 // Handle the two forms of array designator:
180 // array-designator: '[' constant-expression ']'
181 // array-designator: '[' constant-expression '...' constant-expression ']'
182 //
183 // Also, we have to handle the case where the expression after the
184 // designator an an objc message send: '[' objc-message-expr ']'.
185 // Interesting cases are:
186 // [foo bar] -> objc message send
187 // [foo] -> array designator
188 // [foo ... bar] -> array designator
189 // [4][foo bar] -> obsolete GNU designation with objc message send.
190 //
191 // We do not need to check for an expression starting with [[ here. If it
192 // contains an Objective-C message send, then it is not an ill-formed
193 // attribute. If it is a lambda-expression within an array-designator, then
194 // it will be rejected because a constant-expression cannot begin with a
195 // lambda-expression.
196 InMessageExpressionRAIIObject InMessage(*this, true);
197
198 BalancedDelimiterTracker T(*this, tok::l_square);
199 T.consumeOpen();
200 SourceLocation StartLoc = T.getOpenLocation();
201
202 ExprResult Idx;
203
204 // If Objective-C is enabled and this is a typename (class message
205 // send) or send to 'super', parse this as a message send
206 // expression. We handle C++ and C separately, since C++ requires
207 // much more complicated parsing.
208 if (getLangOpts().ObjC && getLangOpts().CPlusPlus) {
209 // Send to 'super'.
210 if (Tok.is(K: tok::identifier) && Tok.getIdentifierInfo() == Ident_super &&
211 NextToken().isNot(K: tok::period) &&
212 getCurScope()->isInObjcMethodScope()) {
213 CheckArrayDesignatorSyntax(P&: *this, Loc: StartLoc, Desig);
214 return ParseAssignmentExprWithObjCMessageExprStart(
215 LBracloc: StartLoc, SuperLoc: ConsumeToken(), ReceiverType: nullptr, ReceiverExpr: nullptr);
216 }
217
218 // Parse the receiver, which is either a type or an expression.
219 bool IsExpr;
220 void *TypeOrExpr;
221 if (ParseObjCXXMessageReceiver(IsExpr, TypeOrExpr)) {
222 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
223 return ExprError();
224 }
225
226 // If the receiver was a type, we have a class message; parse
227 // the rest of it.
228 if (!IsExpr) {
229 CheckArrayDesignatorSyntax(P&: *this, Loc: StartLoc, Desig);
230 return ParseAssignmentExprWithObjCMessageExprStart(LBracloc: StartLoc,
231 SuperLoc: SourceLocation(),
232 ReceiverType: ParsedType::getFromOpaquePtr(P: TypeOrExpr),
233 ReceiverExpr: nullptr);
234 }
235
236 // If the receiver was an expression, we still don't know
237 // whether we have a message send or an array designator; just
238 // adopt the expression for further analysis below.
239 // FIXME: potentially-potentially evaluated expression above?
240 Idx = ExprResult(static_cast<Expr*>(TypeOrExpr));
241 } else if (getLangOpts().ObjC && Tok.is(K: tok::identifier)) {
242 IdentifierInfo *II = Tok.getIdentifierInfo();
243 SourceLocation IILoc = Tok.getLocation();
244 ParsedType ReceiverType;
245 // Three cases. This is a message send to a type: [type foo]
246 // This is a message send to super: [super foo]
247 // This is a message sent to an expr: [super.bar foo]
248 switch (Actions.ObjC().getObjCMessageKind(
249 S: getCurScope(), Name: II, NameLoc: IILoc, IsSuper: II == Ident_super,
250 HasTrailingDot: NextToken().is(K: tok::period), ReceiverType)) {
251 case SemaObjC::ObjCSuperMessage:
252 CheckArrayDesignatorSyntax(P&: *this, Loc: StartLoc, Desig);
253 return ParseAssignmentExprWithObjCMessageExprStart(
254 LBracloc: StartLoc, SuperLoc: ConsumeToken(), ReceiverType: nullptr, ReceiverExpr: nullptr);
255
256 case SemaObjC::ObjCClassMessage:
257 CheckArrayDesignatorSyntax(P&: *this, Loc: StartLoc, Desig);
258 ConsumeToken(); // the identifier
259 if (!ReceiverType) {
260 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
261 return ExprError();
262 }
263
264 // Parse type arguments and protocol qualifiers.
265 if (Tok.is(K: tok::less)) {
266 SourceLocation NewEndLoc;
267 TypeResult NewReceiverType
268 = parseObjCTypeArgsAndProtocolQualifiers(loc: IILoc, type: ReceiverType,
269 /*consumeLastToken=*/true,
270 endLoc&: NewEndLoc);
271 if (!NewReceiverType.isUsable()) {
272 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
273 return ExprError();
274 }
275
276 ReceiverType = NewReceiverType.get();
277 }
278
279 return ParseAssignmentExprWithObjCMessageExprStart(LBracloc: StartLoc,
280 SuperLoc: SourceLocation(),
281 ReceiverType,
282 ReceiverExpr: nullptr);
283
284 case SemaObjC::ObjCInstanceMessage:
285 // Fall through; we'll just parse the expression and
286 // (possibly) treat this like an Objective-C message send
287 // later.
288 break;
289 }
290 }
291
292 // Parse the index expression, if we haven't already gotten one
293 // above (which can only happen in Objective-C++).
294 // Note that we parse this as an assignment expression, not a constant
295 // expression (allowing *=, =, etc) to handle the objc case. Sema needs
296 // to validate that the expression is a constant.
297 // FIXME: We also need to tell Sema that we're in a
298 // potentially-potentially evaluated context.
299 if (!Idx.get()) {
300 Idx = ParseAssignmentExpression();
301 if (Idx.isInvalid()) {
302 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
303 return Idx;
304 }
305 }
306
307 // Given an expression, we could either have a designator (if the next
308 // tokens are '...' or ']' or an objc message send. If this is an objc
309 // message send, handle it now. An objc-message send is the start of
310 // an assignment-expression production.
311 if (getLangOpts().ObjC && Tok.isNot(K: tok::ellipsis) &&
312 Tok.isNot(K: tok::r_square)) {
313 CheckArrayDesignatorSyntax(P&: *this, Loc: Tok.getLocation(), Desig);
314 return ParseAssignmentExprWithObjCMessageExprStart(
315 LBracloc: StartLoc, SuperLoc: SourceLocation(), ReceiverType: nullptr, ReceiverExpr: Idx.get());
316 }
317
318 // If this is a normal array designator, remember it.
319 if (Tok.isNot(K: tok::ellipsis)) {
320 Desig.AddDesignator(D: Designator::CreateArrayDesignator(Index: Idx.get(),
321 LBracketLoc: StartLoc));
322 } else {
323 // Handle the gnu array range extension.
324 Diag(Tok, DiagID: diag::ext_gnu_array_range);
325 SourceLocation EllipsisLoc = ConsumeToken();
326
327 ExprResult RHS(ParseConstantExpression());
328 if (RHS.isInvalid()) {
329 SkipUntil(T: tok::r_square, Flags: StopAtSemi);
330 return RHS;
331 }
332 Desig.AddDesignator(D: Designator::CreateArrayRangeDesignator(
333 Start: Idx.get(), End: RHS.get(), LBracketLoc: StartLoc, EllipsisLoc));
334 }
335
336 T.consumeClose();
337 Desig.getDesignator(Idx: Desig.getNumDesignators() - 1).setRBracketLoc(
338 T.getCloseLocation());
339 }
340
341 // Okay, we're done with the designator sequence. We know that there must be
342 // at least one designator, because the only case we can get into this method
343 // without a designator is when we have an objc message send. That case is
344 // handled and returned from above.
345 assert(!Desig.empty() && "Designator is empty?");
346
347 // Handle a normal designator sequence end, which is an equal.
348 if (Tok.is(K: tok::equal)) {
349 SourceLocation EqualLoc = ConsumeToken();
350 PreferredType.enterDesignatedInitializer(
351 Tok: Tok.getLocation(), BaseType: DesignatorCompletion.PreferredBaseType, D: Desig);
352 return Actions.ActOnDesignatedInitializer(Desig, EqualOrColonLoc: EqualLoc, GNUSyntax: false,
353 Init: ParseInitializer());
354 }
355
356 // Handle a C++20 braced designated initialization, which results in
357 // direct-list-initialization of the aggregate element. We allow this as an
358 // extension from C++11 onwards (when direct-list-initialization was added).
359 if (Tok.is(K: tok::l_brace) && getLangOpts().CPlusPlus11) {
360 PreferredType.enterDesignatedInitializer(
361 Tok: Tok.getLocation(), BaseType: DesignatorCompletion.PreferredBaseType, D: Desig);
362 return Actions.ActOnDesignatedInitializer(Desig, EqualOrColonLoc: SourceLocation(), GNUSyntax: false,
363 Init: ParseBraceInitializer());
364 }
365
366 // We read some number of designators and found something that isn't an = or
367 // an initializer. If we have exactly one array designator, this
368 // is the GNU 'designation: array-designator' extension. Otherwise, it is a
369 // parse error.
370 if (Desig.getNumDesignators() == 1 &&
371 (Desig.getDesignator(Idx: 0).isArrayDesignator() ||
372 Desig.getDesignator(Idx: 0).isArrayRangeDesignator())) {
373 Diag(Tok, DiagID: diag::ext_gnu_missing_equal_designator)
374 << FixItHint::CreateInsertion(InsertionLoc: Tok.getLocation(), Code: "= ");
375 return Actions.ActOnDesignatedInitializer(Desig, EqualOrColonLoc: Tok.getLocation(),
376 GNUSyntax: true, Init: ParseInitializer());
377 }
378
379 Diag(Tok, DiagID: diag::err_expected_equal_designator);
380 return ExprError();
381}
382
383ExprResult Parser::createEmbedExpr() {
384 assert(Tok.getKind() == tok::annot_embed);
385 EmbedAnnotationData *Data =
386 reinterpret_cast<EmbedAnnotationData *>(Tok.getAnnotationValue());
387 ExprResult Res;
388 ASTContext &Context = Actions.getASTContext();
389 SourceLocation StartLoc = ConsumeAnnotationToken();
390 if (Data->BinaryData.size() == 1) {
391 Res = IntegerLiteral::Create(
392 C: Context, V: llvm::APInt(CHAR_BIT, (unsigned char)Data->BinaryData.back()),
393 type: Context.UnsignedCharTy, l: StartLoc);
394 } else {
395 auto CreateStringLiteralFromStringRef = [&](StringRef Str, QualType Ty) {
396 llvm::APSInt ArraySize =
397 Context.MakeIntValue(Value: Str.size(), Type: Context.getSizeType());
398 QualType ArrayTy = Context.getConstantArrayType(
399 EltTy: Ty, ArySize: ArraySize, SizeExpr: nullptr, ASM: ArraySizeModifier::Normal, IndexTypeQuals: 0);
400 return StringLiteral::Create(Ctx: Context, Str, Kind: StringLiteralKind::Binary,
401 Pascal: false, Ty: ArrayTy, Locs: StartLoc);
402 };
403
404 StringLiteral *BinaryDataArg = CreateStringLiteralFromStringRef(
405 Data->BinaryData, Context.UnsignedCharTy);
406 Res = Actions.ActOnEmbedExpr(EmbedKeywordLoc: StartLoc, BinaryData: BinaryDataArg, FileName: Data->FileName);
407 }
408 return Res;
409}
410
411ExprResult Parser::ParseBraceInitializer() {
412 InMessageExpressionRAIIObject InMessage(*this, false);
413
414 BalancedDelimiterTracker T(*this, tok::l_brace);
415 T.consumeOpen();
416 SourceLocation LBraceLoc = T.getOpenLocation();
417
418 /// InitExprs - This is the actual list of expressions contained in the
419 /// initializer.
420 ExprVector InitExprs;
421
422 if (Tok.is(K: tok::r_brace)) {
423 // Empty initializers are a C++ feature and a GNU extension to C before C23.
424 if (!getLangOpts().CPlusPlus) {
425 Diag(Loc: LBraceLoc, DiagID: getLangOpts().C23
426 ? diag::warn_c23_compat_empty_initializer
427 : diag::ext_c_empty_initializer);
428 }
429 // Match the '}'.
430 return Actions.ActOnInitList(LBraceLoc, InitArgList: {}, RBraceLoc: ConsumeBrace());
431 }
432
433 // Enter an appropriate expression evaluation context for an initializer list.
434 EnterExpressionEvaluationContext EnterContext(
435 Actions, EnterExpressionEvaluationContext::InitList);
436
437 bool InitExprsOk = true;
438 QualType LikelyType = PreferredType.get(Tok: T.getOpenLocation());
439 DesignatorCompletionInfo DesignatorCompletion{.InitExprs: InitExprs, .PreferredBaseType: LikelyType};
440 bool CalledSignatureHelp = false;
441 auto RunSignatureHelp = [&] {
442 QualType PreferredType;
443 if (!LikelyType.isNull())
444 PreferredType = Actions.CodeCompletion().ProduceConstructorSignatureHelp(
445 Type: LikelyType->getCanonicalTypeInternal(), Loc: T.getOpenLocation(),
446 Args: InitExprs, OpenParLoc: T.getOpenLocation(), /*Braced=*/true);
447 CalledSignatureHelp = true;
448 return PreferredType;
449 };
450
451 while (true) {
452 PreferredType.enterFunctionArgument(Tok: Tok.getLocation(), ComputeType: RunSignatureHelp);
453
454 // Handle Microsoft __if_exists/if_not_exists if necessary.
455 if (getLangOpts().MicrosoftExt && (Tok.is(K: tok::kw___if_exists) ||
456 Tok.is(K: tok::kw___if_not_exists))) {
457 if (ParseMicrosoftIfExistsBraceInitializer(InitExprs, InitExprsOk)) {
458 if (Tok.isNot(K: tok::comma)) break;
459 ConsumeToken();
460 }
461 if (Tok.is(K: tok::r_brace)) break;
462 continue;
463 }
464
465 // Parse: designation[opt] initializer
466
467 // If we know that this cannot be a designation, just parse the nested
468 // initializer directly.
469 ExprResult SubElt;
470 if (MayBeDesignationStart())
471 SubElt = ParseInitializerWithPotentialDesignator(DesignatorCompletion);
472 else if (Tok.getKind() == tok::annot_embed)
473 SubElt = createEmbedExpr();
474 else
475 SubElt = ParseInitializer();
476
477 if (Tok.is(K: tok::ellipsis))
478 SubElt = Actions.ActOnPackExpansion(Pattern: SubElt.get(), EllipsisLoc: ConsumeToken());
479
480 // If we couldn't parse the subelement, bail out.
481 if (SubElt.isUsable()) {
482 InitExprs.push_back(Elt: SubElt.get());
483 } else {
484 InitExprsOk = false;
485
486 // We have two ways to try to recover from this error: if the code looks
487 // grammatically ok (i.e. we have a comma coming up) try to continue
488 // parsing the rest of the initializer. This allows us to emit
489 // diagnostics for later elements that we find. If we don't see a comma,
490 // assume there is a parse error, and just skip to recover.
491 // FIXME: This comment doesn't sound right. If there is a r_brace
492 // immediately, it can't be an error, since there is no other way of
493 // leaving this loop except through this if.
494 if (Tok.isNot(K: tok::comma)) {
495 SkipUntil(T: tok::r_brace, Flags: StopBeforeMatch);
496 break;
497 }
498 }
499
500 // If we don't have a comma continued list, we're done.
501 if (Tok.isNot(K: tok::comma)) break;
502
503 // TODO: save comma locations if some client cares.
504 ConsumeToken();
505
506 // Handle trailing comma.
507 if (Tok.is(K: tok::r_brace)) break;
508 }
509
510 bool closed = !T.consumeClose();
511
512 if (InitExprsOk && closed)
513 return Actions.ActOnInitList(LBraceLoc, InitArgList: InitExprs,
514 RBraceLoc: T.getCloseLocation());
515
516 return ExprError(); // an error occurred.
517}
518
519bool Parser::ParseMicrosoftIfExistsBraceInitializer(ExprVector &InitExprs,
520 bool &InitExprsOk) {
521 bool trailingComma = false;
522 IfExistsCondition Result;
523 if (ParseMicrosoftIfExistsCondition(Result))
524 return false;
525
526 BalancedDelimiterTracker Braces(*this, tok::l_brace);
527 if (Braces.consumeOpen()) {
528 Diag(Tok, DiagID: diag::err_expected) << tok::l_brace;
529 return false;
530 }
531
532 switch (Result.Behavior) {
533 case IfExistsBehavior::Parse:
534 // Parse the declarations below.
535 break;
536
537 case IfExistsBehavior::Dependent:
538 Diag(Loc: Result.KeywordLoc, DiagID: diag::warn_microsoft_dependent_exists)
539 << Result.IsIfExists;
540 // Fall through to skip.
541 [[fallthrough]];
542
543 case IfExistsBehavior::Skip:
544 Braces.skipToEnd();
545 return false;
546 }
547
548 DesignatorCompletionInfo DesignatorCompletion{
549 .InitExprs: InitExprs,
550 .PreferredBaseType: PreferredType.get(Tok: Braces.getOpenLocation()),
551 };
552 while (!isEofOrEom()) {
553 trailingComma = false;
554 // If we know that this cannot be a designation, just parse the nested
555 // initializer directly.
556 ExprResult SubElt;
557 if (MayBeDesignationStart())
558 SubElt = ParseInitializerWithPotentialDesignator(DesignatorCompletion);
559 else
560 SubElt = ParseInitializer();
561
562 if (Tok.is(K: tok::ellipsis))
563 SubElt = Actions.ActOnPackExpansion(Pattern: SubElt.get(), EllipsisLoc: ConsumeToken());
564
565 // If we couldn't parse the subelement, bail out.
566 if (!SubElt.isInvalid())
567 InitExprs.push_back(Elt: SubElt.get());
568 else
569 InitExprsOk = false;
570
571 if (Tok.is(K: tok::comma)) {
572 ConsumeToken();
573 trailingComma = true;
574 }
575
576 if (Tok.is(K: tok::r_brace))
577 break;
578 }
579
580 Braces.consumeClose();
581
582 return !trailingComma;
583}
584