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/Parse/RAIIObjectsForParser.h"
21	#include "clang/Sema/DeclSpec.h"
22	#include "clang/Sema/EnterExpressionEvaluationContext.h"
23	#include "clang/Sema/ParsedTemplate.h"
24	#include "clang/Sema/Scope.h"
25	#include "clang/Sema/SemaCodeCompletion.h"
26	#include "llvm/ADT/STLForwardCompat.h"
27	#include "llvm/Support/Path.h"
28	#include "llvm/Support/TimeProfiler.h"
29	using namespace clang;
30
31
32	namespace {
33	/// A comment handler that passes comments found by the preprocessor
34	/// to the parser action.
35	class ActionCommentHandler : public CommentHandler {
36	Sema &S;
37
38	public:
39	explicit ActionCommentHandler(Sema &S) : S(S) { }
40
41	bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
42	S.ActOnComment(Comment);
43	return false;
44	}
45	};
46	} // end anonymous namespace
47
48	IdentifierInfo *Parser::getSEHExceptKeyword() {
49	// __except is accepted as a (contextual) keyword
50	if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
51	Ident__except = PP.getIdentifierInfo(Name: "__except");
52
53	return Ident__except;
54	}
55
56	Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
57	: PP(pp),
58	PreferredType(&actions.getASTContext(), pp.isCodeCompletionEnabled()),
59	Actions(actions), Diags(PP.getDiagnostics()), StackHandler(Diags),
60	GreaterThanIsOperator(true), ColonIsSacred(false),
61	InMessageExpression(false), ParsingInObjCContainer(false),
62	TemplateParameterDepth(0) {
63	SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
64	Tok.startToken();
65	Tok.setKind(tok::eof);
66	Actions.CurScope = nullptr;
67	NumCachedScopes = 0;
68	CurParsedObjCImpl = nullptr;
69
70	// Add #pragma handlers. These are removed and destroyed in the
71	// destructor.
72	initializePragmaHandlers();
73
74	CommentSemaHandler.reset(p: new ActionCommentHandler(actions));
75	PP.addCommentHandler(Handler: CommentSemaHandler.get());
76
77	PP.setCodeCompletionHandler(*this);
78
79	Actions.ParseTypeFromStringCallback =
80	[this](StringRef TypeStr, StringRef Context, SourceLocation IncludeLoc) {
81	return this->ParseTypeFromString(TypeStr, Context, IncludeLoc);
82	};
83	}
84
85	DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
86	return Diags.Report(Loc, DiagID);
87	}
88
89	DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
90	return Diag(Loc: Tok.getLocation(), DiagID);
91	}
92
93	DiagnosticBuilder Parser::DiagCompat(SourceLocation Loc,
94	unsigned CompatDiagId) {
95	return Diag(Loc,
96	DiagID: DiagnosticIDs::getCXXCompatDiagId(LangOpts: getLangOpts(), CompatDiagId));
97	}
98
99	DiagnosticBuilder Parser::DiagCompat(const Token &Tok, unsigned CompatDiagId) {
100	return DiagCompat(Loc: Tok.getLocation(), CompatDiagId);
101	}
102
103	void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
104	SourceRange ParenRange) {
105	SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: ParenRange.getEnd());
106	if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
107	// We can't display the parentheses, so just dig the
108	// warning/error and return.
109	Diag(Loc, DiagID: DK);
110	return;
111	}
112
113	Diag(Loc, DiagID: DK)
114	<< FixItHint::CreateInsertion(InsertionLoc: ParenRange.getBegin(), Code: "(")
115	<< FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: ")");
116	}
117
118	static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
119	switch (ExpectedTok) {
120	case tok::semi:
121	return Tok.is(K: tok::colon) || Tok.is(K: tok::comma); // : or , for ;
122	default: return false;
123	}
124	}
125
126	bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
127	StringRef Msg) {
128	if (Tok.is(K: ExpectedTok) || Tok.is(K: tok::code_completion)) {
129	ConsumeAnyToken();
130	return false;
131	}
132
133	// Detect common single-character typos and resume.
134	if (IsCommonTypo(ExpectedTok, Tok)) {
135	SourceLocation Loc = Tok.getLocation();
136	{
137	DiagnosticBuilder DB = Diag(Loc, DiagID);
138	DB << FixItHint::CreateReplacement(
139	RemoveRange: SourceRange(Loc), Code: tok::getPunctuatorSpelling(Kind: ExpectedTok));
140	if (DiagID == diag::err_expected)
141	DB << ExpectedTok;
142	else if (DiagID == diag::err_expected_after)
143	DB << Msg << ExpectedTok;
144	else
145	DB << Msg;
146	}
147
148	// Pretend there wasn't a problem.
149	ConsumeAnyToken();
150	return false;
151	}
152
153	SourceLocation EndLoc = PP.getLocForEndOfToken(Loc: PrevTokLocation);
154	const char *Spelling = nullptr;
155	if (EndLoc.isValid())
156	Spelling = tok::getPunctuatorSpelling(Kind: ExpectedTok);
157
158	DiagnosticBuilder DB =
159	Spelling
160	? Diag(Loc: EndLoc, DiagID) << FixItHint::CreateInsertion(InsertionLoc: EndLoc, Code: Spelling)
161	: Diag(Tok, DiagID);
162	if (DiagID == diag::err_expected)
163	DB << ExpectedTok;
164	else if (DiagID == diag::err_expected_after)
165	DB << Msg << ExpectedTok;
166	else
167	DB << Msg;
168
169	return true;
170	}
171
172	bool Parser::ExpectAndConsumeSemi(unsigned DiagID, StringRef TokenUsed) {
173	if (TryConsumeToken(Expected: tok::semi))
174	return false;
175
176	if (Tok.is(K: tok::code_completion)) {
177	handleUnexpectedCodeCompletionToken();
178	return false;
179	}
180
181	if ((Tok.is(K: tok::r_paren) || Tok.is(K: tok::r_square)) &&
182	NextToken().is(K: tok::semi)) {
183	Diag(Tok, DiagID: diag::err_extraneous_token_before_semi)
184	<< PP.getSpelling(Tok)
185	<< FixItHint::CreateRemoval(RemoveRange: Tok.getLocation());
186	ConsumeAnyToken(); // The ')' or ']'.
187	ConsumeToken(); // The ';'.
188	return false;
189	}
190
191	return ExpectAndConsume(ExpectedTok: tok::semi, DiagID , Msg: TokenUsed);
192	}
193
194	void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, DeclSpec::TST TST) {
195	if (!Tok.is(K: tok::semi)) return;
196
197	bool HadMultipleSemis = false;
198	SourceLocation StartLoc = Tok.getLocation();
199	SourceLocation EndLoc = Tok.getLocation();
200	ConsumeToken();
201
202	while ((Tok.is(K: tok::semi) && !Tok.isAtStartOfLine())) {
203	HadMultipleSemis = true;
204	EndLoc = Tok.getLocation();
205	ConsumeToken();
206	}
207
208	// C++11 allows extra semicolons at namespace scope, but not in any of the
209	// other contexts.
210	if (Kind == ExtraSemiKind::OutsideFunction && getLangOpts().CPlusPlus) {
211	if (getLangOpts().CPlusPlus11)
212	Diag(Loc: StartLoc, DiagID: diag::warn_cxx98_compat_top_level_semi)
213	<< FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
214	else
215	Diag(Loc: StartLoc, DiagID: diag::ext_extra_semi_cxx11)
216	<< FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
217	return;
218	}
219
220	if (Kind != ExtraSemiKind::AfterMemberFunctionDefinition || HadMultipleSemis)
221	Diag(Loc: StartLoc, DiagID: diag::ext_extra_semi)
222	<< Kind
223	<< DeclSpec::getSpecifierName(
224	T: TST, Policy: Actions.getASTContext().getPrintingPolicy())
225	<< FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
226	else
227	// A single semicolon is valid after a member function definition.
228	Diag(Loc: StartLoc, DiagID: diag::warn_extra_semi_after_mem_fn_def)
229	<< FixItHint::CreateRemoval(RemoveRange: SourceRange(StartLoc, EndLoc));
230	}
231
232	bool Parser::expectIdentifier() {
233	if (Tok.is(K: tok::identifier))
234	return false;
235	if (const auto *II = Tok.getIdentifierInfo()) {
236	if (II->isCPlusPlusKeyword(LangOpts: getLangOpts())) {
237	Diag(Tok, DiagID: diag::err_expected_token_instead_of_objcxx_keyword)
238	<< tok::identifier << Tok.getIdentifierInfo();
239	// Objective-C++: Recover by treating this keyword as a valid identifier.
240	return false;
241	}
242	}
243	Diag(Tok, DiagID: diag::err_expected) << tok::identifier;
244	return true;
245	}
246
247	void Parser::checkCompoundToken(SourceLocation FirstTokLoc,
248	tok::TokenKind FirstTokKind, CompoundToken Op) {
249	if (FirstTokLoc.isInvalid())
250	return;
251	SourceLocation SecondTokLoc = Tok.getLocation();
252
253	// If either token is in a macro, we expect both tokens to come from the same
254	// macro expansion.
255	if ((FirstTokLoc.isMacroID() || SecondTokLoc.isMacroID()) &&
256	PP.getSourceManager().getFileID(SpellingLoc: FirstTokLoc) !=
257	PP.getSourceManager().getFileID(SpellingLoc: SecondTokLoc)) {
258	Diag(Loc: FirstTokLoc, DiagID: diag::warn_compound_token_split_by_macro)
259	<< (FirstTokKind == Tok.getKind()) << FirstTokKind << Tok.getKind()
260	<< static_cast<int>(Op) << SourceRange(FirstTokLoc);
261	Diag(Loc: SecondTokLoc, DiagID: diag::note_compound_token_split_second_token_here)
262	<< (FirstTokKind == Tok.getKind()) << Tok.getKind()
263	<< SourceRange(SecondTokLoc);
264	return;
265	}
266
267	// We expect the tokens to abut.
268	if (Tok.hasLeadingSpace() || Tok.isAtStartOfLine()) {
269	SourceLocation SpaceLoc = PP.getLocForEndOfToken(Loc: FirstTokLoc);
270	if (SpaceLoc.isInvalid())
271	SpaceLoc = FirstTokLoc;
272	Diag(Loc: SpaceLoc, DiagID: diag::warn_compound_token_split_by_whitespace)
273	<< (FirstTokKind == Tok.getKind()) << FirstTokKind << Tok.getKind()
274	<< static_cast<int>(Op) << SourceRange(FirstTokLoc, SecondTokLoc);
275	return;
276	}
277	}
278
279	//===----------------------------------------------------------------------===//
280	// Error recovery.
281	//===----------------------------------------------------------------------===//
282
283	static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
284	return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
285	}
286
287	bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
288	// We always want this function to skip at least one token if the first token
289	// isn't T and if not at EOF.
290	bool isFirstTokenSkipped = true;
291	while (true) {
292	// If we found one of the tokens, stop and return true.
293	for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
294	if (Tok.is(K: Toks[i])) {
295	if (HasFlagsSet(L: Flags, R: StopBeforeMatch)) {
296	// Noop, don't consume the token.
297	} else {
298	ConsumeAnyToken();
299	}
300	return true;
301	}
302	}
303
304	// Important special case: The caller has given up and just wants us to
305	// skip the rest of the file. Do this without recursing, since we can
306	// get here precisely because the caller detected too much recursion.
307	if (Toks.size() == 1 && Toks[0] == tok::eof &&
308	!HasFlagsSet(L: Flags, R: StopAtSemi) &&
309	!HasFlagsSet(L: Flags, R: StopAtCodeCompletion)) {
310	while (Tok.isNot(K: tok::eof))
311	ConsumeAnyToken();
312	return true;
313	}
314
315	switch (Tok.getKind()) {
316	case tok::eof:
317	// Ran out of tokens.
318	return false;
319
320	case tok::annot_pragma_openmp:
321	case tok::annot_attr_openmp:
322	case tok::annot_pragma_openmp_end:
323	// Stop before an OpenMP pragma boundary.
324	if (OpenMPDirectiveParsing)
325	return false;
326	ConsumeAnnotationToken();
327	break;
328	case tok::annot_pragma_openacc:
329	case tok::annot_pragma_openacc_end:
330	// Stop before an OpenACC pragma boundary.
331	if (OpenACCDirectiveParsing)
332	return false;
333	ConsumeAnnotationToken();
334	break;
335	case tok::annot_module_begin:
336	case tok::annot_module_end:
337	case tok::annot_module_include:
338	case tok::annot_repl_input_end:
339	// Stop before we change submodules. They generally indicate a "good"
340	// place to pick up parsing again (except in the special case where
341	// we're trying to skip to EOF).
342	return false;
343
344	case tok::code_completion:
345	if (!HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
346	handleUnexpectedCodeCompletionToken();
347	return false;
348
349	case tok::l_paren:
350	// Recursively skip properly-nested parens.
351	ConsumeParen();
352	if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
353	SkipUntil(T: tok::r_paren, Flags: StopAtCodeCompletion);
354	else
355	SkipUntil(T: tok::r_paren);
356	break;
357	case tok::l_square:
358	// Recursively skip properly-nested square brackets.
359	ConsumeBracket();
360	if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
361	SkipUntil(T: tok::r_square, Flags: StopAtCodeCompletion);
362	else
363	SkipUntil(T: tok::r_square);
364	break;
365	case tok::l_brace:
366	// Recursively skip properly-nested braces.
367	ConsumeBrace();
368	if (HasFlagsSet(L: Flags, R: StopAtCodeCompletion))
369	SkipUntil(T: tok::r_brace, Flags: StopAtCodeCompletion);
370	else
371	SkipUntil(T: tok::r_brace);
372	break;
373	case tok::question:
374	// Recursively skip ? ... : pairs; these function as brackets. But
375	// still stop at a semicolon if requested.
376	ConsumeToken();
377	SkipUntil(T: tok::colon,
378	Flags: SkipUntilFlags(unsigned(Flags) &
379	unsigned(StopAtCodeCompletion | StopAtSemi)));
380	break;
381
382	// Okay, we found a ']' or '}' or ')', which we think should be balanced.
383	// Since the user wasn't looking for this token (if they were, it would
384	// already be handled), this isn't balanced. If there is a LHS token at a
385	// higher level, we will assume that this matches the unbalanced token
386	// and return it. Otherwise, this is a spurious RHS token, which we skip.
387	case tok::r_paren:
388	if (ParenCount && !isFirstTokenSkipped)
389	return false; // Matches something.
390	ConsumeParen();
391	break;
392	case tok::r_square:
393	if (BracketCount && !isFirstTokenSkipped)
394	return false; // Matches something.
395	ConsumeBracket();
396	break;
397	case tok::r_brace:
398	if (BraceCount && !isFirstTokenSkipped)
399	return false; // Matches something.
400	ConsumeBrace();
401	break;
402
403	case tok::semi:
404	if (HasFlagsSet(L: Flags, R: StopAtSemi))
405	return false;
406	[[fallthrough]];
407	default:
408	// Skip this token.
409	ConsumeAnyToken();
410	break;
411	}
412	isFirstTokenSkipped = false;
413	}
414	}
415
416	//===----------------------------------------------------------------------===//
417	// Scope manipulation
418	//===----------------------------------------------------------------------===//
419
420	void Parser::EnterScope(unsigned ScopeFlags) {
421	if (NumCachedScopes) {
422	Scope *N = ScopeCache[--NumCachedScopes];
423	N->Init(parent: getCurScope(), flags: ScopeFlags);
424	Actions.CurScope = N;
425	} else {
426	Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
427	}
428	}
429
430	void Parser::ExitScope() {
431	assert(getCurScope() && "Scope imbalance!");
432
433	// Inform the actions module that this scope is going away if there are any
434	// decls in it.
435	Actions.ActOnPopScope(Loc: Tok.getLocation(), S: getCurScope());
436
437	Scope *OldScope = getCurScope();
438	Actions.CurScope = OldScope->getParent();
439
440	if (NumCachedScopes == ScopeCacheSize)
441	delete OldScope;
442	else
443	ScopeCache[NumCachedScopes++] = OldScope;
444	}
445
446	Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
447	bool ManageFlags)
448	: CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
449	if (CurScope) {
450	OldFlags = CurScope->getFlags();
451	CurScope->setFlags(ScopeFlags);
452	}
453	}
454
455	Parser::ParseScopeFlags::~ParseScopeFlags() {
456	if (CurScope)
457	CurScope->setFlags(OldFlags);
458	}
459
460
461	//===----------------------------------------------------------------------===//
462	// C99 6.9: External Definitions.
463	//===----------------------------------------------------------------------===//
464
465	Parser::~Parser() {
466	// If we still have scopes active, delete the scope tree.
467	delete getCurScope();
468	Actions.CurScope = nullptr;
469
470	// Free the scope cache.
471	for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
472	delete ScopeCache[i];
473
474	resetPragmaHandlers();
475
476	PP.removeCommentHandler(Handler: CommentSemaHandler.get());
477
478	PP.clearCodeCompletionHandler();
479
480	DestroyTemplateIds();
481	}
482
483	void Parser::Initialize() {
484	// Create the translation unit scope. Install it as the current scope.
485	assert(getCurScope() == nullptr && "A scope is already active?");
486	EnterScope(ScopeFlags: Scope::DeclScope);
487	Actions.ActOnTranslationUnitScope(S: getCurScope());
488
489	// Initialization for Objective-C context sensitive keywords recognition.
490	// Referenced in Parser::ParseObjCTypeQualifierList.
491	if (getLangOpts().ObjC) {
492	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::in)] =
493	&PP.getIdentifierTable().get(Name: "in");
494	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::out)] =
495	&PP.getIdentifierTable().get(Name: "out");
496	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::inout)] =
497	&PP.getIdentifierTable().get(Name: "inout");
498	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::oneway)] =
499	&PP.getIdentifierTable().get(Name: "oneway");
500	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::bycopy)] =
501	&PP.getIdentifierTable().get(Name: "bycopy");
502	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::byref)] =
503	&PP.getIdentifierTable().get(Name: "byref");
504	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::nonnull)] =
505	&PP.getIdentifierTable().get(Name: "nonnull");
506	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::nullable)] =
507	&PP.getIdentifierTable().get(Name: "nullable");
508	ObjCTypeQuals[llvm::to_underlying(E: ObjCTypeQual::null_unspecified)] =
509	&PP.getIdentifierTable().get(Name: "null_unspecified");
510	}
511
512	Ident_instancetype = nullptr;
513	Ident_final = nullptr;
514	Ident_sealed = nullptr;
515	Ident_abstract = nullptr;
516	Ident_override = nullptr;
517	Ident_trivially_relocatable_if_eligible = nullptr;
518	Ident_replaceable_if_eligible = nullptr;
519	Ident_GNU_final = nullptr;
520	Ident_import = nullptr;
521	Ident_module = nullptr;
522
523	Ident_super = &PP.getIdentifierTable().get(Name: "super");
524
525	Ident_vector = nullptr;
526	Ident_bool = nullptr;
527	Ident_Bool = nullptr;
528	Ident_pixel = nullptr;
529	if (getLangOpts().AltiVec || getLangOpts().ZVector) {
530	Ident_vector = &PP.getIdentifierTable().get(Name: "vector");
531	Ident_bool = &PP.getIdentifierTable().get(Name: "bool");
532	Ident_Bool = &PP.getIdentifierTable().get(Name: "_Bool");
533	}
534	if (getLangOpts().AltiVec)
535	Ident_pixel = &PP.getIdentifierTable().get(Name: "pixel");
536
537	Ident_introduced = nullptr;
538	Ident_deprecated = nullptr;
539	Ident_obsoleted = nullptr;
540	Ident_unavailable = nullptr;
541	Ident_strict = nullptr;
542	Ident_replacement = nullptr;
543
544	Ident_language = Ident_defined_in = Ident_generated_declaration = Ident_USR =
545	nullptr;
546
547	Ident__except = nullptr;
548
549	Ident__exception_code = Ident__exception_info = nullptr;
550	Ident__abnormal_termination = Ident___exception_code = nullptr;
551	Ident___exception_info = Ident___abnormal_termination = nullptr;
552	Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
553	Ident_AbnormalTermination = nullptr;
554
555	if(getLangOpts().Borland) {
556	Ident__exception_info = PP.getIdentifierInfo(Name: "_exception_info");
557	Ident___exception_info = PP.getIdentifierInfo(Name: "__exception_info");
558	Ident_GetExceptionInfo = PP.getIdentifierInfo(Name: "GetExceptionInformation");
559	Ident__exception_code = PP.getIdentifierInfo(Name: "_exception_code");
560	Ident___exception_code = PP.getIdentifierInfo(Name: "__exception_code");
561	Ident_GetExceptionCode = PP.getIdentifierInfo(Name: "GetExceptionCode");
562	Ident__abnormal_termination = PP.getIdentifierInfo(Name: "_abnormal_termination");
563	Ident___abnormal_termination = PP.getIdentifierInfo(Name: "__abnormal_termination");
564	Ident_AbnormalTermination = PP.getIdentifierInfo(Name: "AbnormalTermination");
565
566	PP.SetPoisonReason(II: Ident__exception_code,DiagID: diag::err_seh___except_block);
567	PP.SetPoisonReason(II: Ident___exception_code,DiagID: diag::err_seh___except_block);
568	PP.SetPoisonReason(II: Ident_GetExceptionCode,DiagID: diag::err_seh___except_block);
569	PP.SetPoisonReason(II: Ident__exception_info,DiagID: diag::err_seh___except_filter);
570	PP.SetPoisonReason(II: Ident___exception_info,DiagID: diag::err_seh___except_filter);
571	PP.SetPoisonReason(II: Ident_GetExceptionInfo,DiagID: diag::err_seh___except_filter);
572	PP.SetPoisonReason(II: Ident__abnormal_termination,DiagID: diag::err_seh___finally_block);
573	PP.SetPoisonReason(II: Ident___abnormal_termination,DiagID: diag::err_seh___finally_block);
574	PP.SetPoisonReason(II: Ident_AbnormalTermination,DiagID: diag::err_seh___finally_block);
575	}
576
577	if (getLangOpts().CPlusPlusModules) {
578	Ident_import = PP.getIdentifierInfo(Name: "import");
579	Ident_module = PP.getIdentifierInfo(Name: "module");
580	}
581
582	Actions.Initialize();
583
584	// Prime the lexer look-ahead.
585	ConsumeToken();
586	}
587
588	void Parser::DestroyTemplateIds() {
589	for (TemplateIdAnnotation *Id : TemplateIds)
590	Id->Destroy();
591	TemplateIds.clear();
592	}
593
594	bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result,
595	Sema::ModuleImportState &ImportState) {
596	Actions.ActOnStartOfTranslationUnit();
597
598	// For C++20 modules, a module decl must be the first in the TU. We also
599	// need to track module imports.
600	ImportState = Sema::ModuleImportState::FirstDecl;
601	bool NoTopLevelDecls = ParseTopLevelDecl(Result, ImportState);
602
603	// C11 6.9p1 says translation units must have at least one top-level
604	// declaration. C++ doesn't have this restriction. We also don't want to
605	// complain if we have a precompiled header, although technically if the PCH
606	// is empty we should still emit the (pedantic) diagnostic.
607	// If the main file is a header, we're only pretending it's a TU; don't warn.
608	if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
609	!getLangOpts().CPlusPlus && !getLangOpts().IsHeaderFile)
610	Diag(DiagID: diag::ext_empty_translation_unit);
611
612	return NoTopLevelDecls;
613	}
614
615	bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result,
616	Sema::ModuleImportState &ImportState) {
617	DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
618
619	Result = nullptr;
620	switch (Tok.getKind()) {
621	case tok::annot_pragma_unused:
622	HandlePragmaUnused();
623	return false;
624
625	case tok::kw_export:
626	switch (NextToken().getKind()) {
627	case tok::kw_module:
628	goto module_decl;
629
630	// Note: no need to handle kw_import here. We only form kw_import under
631	// the Standard C++ Modules, and in that case 'export import' is parsed as
632	// an export-declaration containing an import-declaration.
633
634	// Recognize context-sensitive C++20 'export module' and 'export import'
635	// declarations.
636	case tok::identifier: {
637	IdentifierInfo *II = NextToken().getIdentifierInfo();
638	if ((II == Ident_module || II == Ident_import) &&
639	GetLookAheadToken(N: 2).isNot(K: tok::coloncolon)) {
640	if (II == Ident_module)
641	goto module_decl;
642	else
643	goto import_decl;
644	}
645	break;
646	}
647
648	default:
649	break;
650	}
651	break;
652
653	case tok::kw_module:
654	module_decl:
655	Result = ParseModuleDecl(ImportState);
656	return false;
657
658	case tok::kw_import:
659	import_decl: {
660	Decl *ImportDecl = ParseModuleImport(AtLoc: SourceLocation(), ImportState);
661	Result = Actions.ConvertDeclToDeclGroup(Ptr: ImportDecl);
662	return false;
663	}
664
665	case tok::annot_module_include: {
666	auto Loc = Tok.getLocation();
667	Module *Mod = reinterpret_cast<Module *>(Tok.getAnnotationValue());
668	// FIXME: We need a better way to disambiguate C++ clang modules and
669	// standard C++ modules.
670	if (!getLangOpts().CPlusPlusModules || !Mod->isHeaderUnit())
671	Actions.ActOnAnnotModuleInclude(DirectiveLoc: Loc, Mod);
672	else {
673	DeclResult Import =
674	Actions.ActOnModuleImport(StartLoc: Loc, ExportLoc: SourceLocation(), ImportLoc: Loc, M: Mod);
675	Decl *ImportDecl = Import.isInvalid() ? nullptr : Import.get();
676	Result = Actions.ConvertDeclToDeclGroup(Ptr: ImportDecl);
677	}
678	ConsumeAnnotationToken();
679	return false;
680	}
681
682	case tok::annot_module_begin:
683	Actions.ActOnAnnotModuleBegin(
684	DirectiveLoc: Tok.getLocation(),
685	Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
686	ConsumeAnnotationToken();
687	ImportState = Sema::ModuleImportState::NotACXX20Module;
688	return false;
689
690	case tok::annot_module_end:
691	Actions.ActOnAnnotModuleEnd(
692	DirectiveLoc: Tok.getLocation(),
693	Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
694	ConsumeAnnotationToken();
695	ImportState = Sema::ModuleImportState::NotACXX20Module;
696	return false;
697
698	case tok::eof:
699	case tok::annot_repl_input_end:
700	// Check whether -fmax-tokens= was reached.
701	if (PP.getMaxTokens() != 0 && PP.getTokenCount() > PP.getMaxTokens()) {
702	PP.Diag(Loc: Tok.getLocation(), DiagID: diag::warn_max_tokens_total)
703	<< PP.getTokenCount() << PP.getMaxTokens();
704	SourceLocation OverrideLoc = PP.getMaxTokensOverrideLoc();
705	if (OverrideLoc.isValid()) {
706	PP.Diag(Loc: OverrideLoc, DiagID: diag::note_max_tokens_total_override);
707	}
708	}
709
710	// Late template parsing can begin.
711	Actions.SetLateTemplateParser(LTP: LateTemplateParserCallback, LTPCleanup: nullptr, P: this);
712	Actions.ActOnEndOfTranslationUnit();
713	//else don't tell Sema that we ended parsing: more input might come.
714	return true;
715
716	case tok::identifier:
717	// C++2a [basic.link]p3:
718	// A token sequence beginning with 'export[opt] module' or
719	// 'export[opt] import' and not immediately followed by '::'
720	// is never interpreted as the declaration of a top-level-declaration.
721	if ((Tok.getIdentifierInfo() == Ident_module ||
722	Tok.getIdentifierInfo() == Ident_import) &&
723	NextToken().isNot(K: tok::coloncolon)) {
724	if (Tok.getIdentifierInfo() == Ident_module)
725	goto module_decl;
726	else
727	goto import_decl;
728	}
729	break;
730
731	default:
732	break;
733	}
734
735	ParsedAttributes DeclAttrs(AttrFactory);
736	ParsedAttributes DeclSpecAttrs(AttrFactory);
737	// GNU attributes are applied to the declaration specification while the
738	// standard attributes are applied to the declaration. We parse the two
739	// attribute sets into different containters so we can apply them during
740	// the regular parsing process.
741	while (MaybeParseCXX11Attributes(Attrs&: DeclAttrs) ||
742	MaybeParseGNUAttributes(Attrs&: DeclSpecAttrs))
743	;
744
745	Result = ParseExternalDeclaration(DeclAttrs, DeclSpecAttrs);
746	// An empty Result might mean a line with ';' or some parsing error, ignore
747	// it.
748	if (Result) {
749	if (ImportState == Sema::ModuleImportState::FirstDecl)
750	// First decl was not modular.
751	ImportState = Sema::ModuleImportState::NotACXX20Module;
752	else if (ImportState == Sema::ModuleImportState::ImportAllowed)
753	// Non-imports disallow further imports.
754	ImportState = Sema::ModuleImportState::ImportFinished;
755	else if (ImportState ==
756	Sema::ModuleImportState::PrivateFragmentImportAllowed)
757	// Non-imports disallow further imports.
758	ImportState = Sema::ModuleImportState::PrivateFragmentImportFinished;
759	}
760	return false;
761	}
762
763	Parser::DeclGroupPtrTy
764	Parser::ParseExternalDeclaration(ParsedAttributes &Attrs,
765	ParsedAttributes &DeclSpecAttrs,
766	ParsingDeclSpec *DS) {
767	DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
768	ParenBraceBracketBalancer BalancerRAIIObj(*this);
769
770	if (PP.isCodeCompletionReached()) {
771	cutOffParsing();
772	return nullptr;
773	}
774
775	Decl *SingleDecl = nullptr;
776	switch (Tok.getKind()) {
777	case tok::annot_pragma_vis:
778	HandlePragmaVisibility();
779	return nullptr;
780	case tok::annot_pragma_pack:
781	HandlePragmaPack();
782	return nullptr;
783	case tok::annot_pragma_msstruct:
784	HandlePragmaMSStruct();
785	return nullptr;
786	case tok::annot_pragma_align:
787	HandlePragmaAlign();
788	return nullptr;
789	case tok::annot_pragma_weak:
790	HandlePragmaWeak();
791	return nullptr;
792	case tok::annot_pragma_weakalias:
793	HandlePragmaWeakAlias();
794	return nullptr;
795	case tok::annot_pragma_redefine_extname:
796	HandlePragmaRedefineExtname();
797	return nullptr;
798	case tok::annot_pragma_fp_contract:
799	HandlePragmaFPContract();
800	return nullptr;
801	case tok::annot_pragma_fenv_access:
802	case tok::annot_pragma_fenv_access_ms:
803	HandlePragmaFEnvAccess();
804	return nullptr;
805	case tok::annot_pragma_fenv_round:
806	HandlePragmaFEnvRound();
807	return nullptr;
808	case tok::annot_pragma_cx_limited_range:
809	HandlePragmaCXLimitedRange();
810	return nullptr;
811	case tok::annot_pragma_float_control:
812	HandlePragmaFloatControl();
813	return nullptr;
814	case tok::annot_pragma_fp:
815	HandlePragmaFP();
816	break;
817	case tok::annot_pragma_opencl_extension:
818	HandlePragmaOpenCLExtension();
819	return nullptr;
820	case tok::annot_attr_openmp:
821	case tok::annot_pragma_openmp: {
822	AccessSpecifier AS = AS_none;
823	return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs);
824	}
825	case tok::annot_pragma_openacc: {
826	AccessSpecifier AS = AS_none;
827	return ParseOpenACCDirectiveDecl(AS, Attrs, TagType: DeclSpec::TST_unspecified,
828	/*TagDecl=*/nullptr);
829	}
830	case tok::annot_pragma_ms_pointers_to_members:
831	HandlePragmaMSPointersToMembers();
832	return nullptr;
833	case tok::annot_pragma_ms_vtordisp:
834	HandlePragmaMSVtorDisp();
835	return nullptr;
836	case tok::annot_pragma_ms_pragma:
837	HandlePragmaMSPragma();
838	return nullptr;
839	case tok::annot_pragma_dump:
840	HandlePragmaDump();
841	return nullptr;
842	case tok::annot_pragma_attribute:
843	HandlePragmaAttribute();
844	return nullptr;
845	case tok::semi:
846	// Either a C++11 empty-declaration or attribute-declaration.
847	SingleDecl =
848	Actions.ActOnEmptyDeclaration(S: getCurScope(), AttrList: Attrs, SemiLoc: Tok.getLocation());
849	ConsumeExtraSemi(Kind: ExtraSemiKind::OutsideFunction);
850	break;
851	case tok::r_brace:
852	Diag(Tok, DiagID: diag::err_extraneous_closing_brace);
853	ConsumeBrace();
854	return nullptr;
855	case tok::eof:
856	Diag(Tok, DiagID: diag::err_expected_external_declaration);
857	return nullptr;
858	case tok::kw___extension__: {
859	// __extension__ silences extension warnings in the subexpression.
860	ExtensionRAIIObject O(Diags); // Use RAII to do this.
861	ConsumeToken();
862	return ParseExternalDeclaration(Attrs, DeclSpecAttrs);
863	}
864	case tok::kw_asm: {
865	ProhibitAttributes(Attrs);
866
867	SourceLocation StartLoc = Tok.getLocation();
868	SourceLocation EndLoc;
869
870	ExprResult Result(ParseSimpleAsm(/*ForAsmLabel*/ false, EndLoc: &EndLoc));
871
872	// Check if GNU-style InlineAsm is disabled.
873	// Empty asm string is allowed because it will not introduce
874	// any assembly code.
875	if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
876	const auto *SL = cast<StringLiteral>(Val: Result.get());
877	if (!SL->getString().trim().empty())
878	Diag(Loc: StartLoc, DiagID: diag::err_gnu_inline_asm_disabled);
879	}
880
881	ExpectAndConsume(ExpectedTok: tok::semi, DiagID: diag::err_expected_after,
882	Msg: "top-level asm block");
883
884	if (Result.isInvalid())
885	return nullptr;
886	SingleDecl = Actions.ActOnFileScopeAsmDecl(expr: Result.get(), AsmLoc: StartLoc, RParenLoc: EndLoc);
887	break;
888	}
889	case tok::at:
890	return ParseObjCAtDirectives(DeclAttrs&: Attrs, DeclSpecAttrs);
891	case tok::minus:
892	case tok::plus:
893	if (!getLangOpts().ObjC) {
894	Diag(Tok, DiagID: diag::err_expected_external_declaration);
895	ConsumeToken();
896	return nullptr;
897	}
898	SingleDecl = ParseObjCMethodDefinition();
899	break;
900	case tok::code_completion:
901	cutOffParsing();
902	if (CurParsedObjCImpl) {
903	// Code-complete Objective-C methods even without leading '-'/'+' prefix.
904	Actions.CodeCompletion().CodeCompleteObjCMethodDecl(
905	S: getCurScope(),
906	/*IsInstanceMethod=*/std::nullopt,
907	/*ReturnType=*/nullptr);
908	}
909
910	SemaCodeCompletion::ParserCompletionContext PCC;
911	if (CurParsedObjCImpl) {
912	PCC = SemaCodeCompletion::PCC_ObjCImplementation;
913	} else if (PP.isIncrementalProcessingEnabled()) {
914	PCC = SemaCodeCompletion::PCC_TopLevelOrExpression;
915	} else {
916	PCC = SemaCodeCompletion::PCC_Namespace;
917	};
918	Actions.CodeCompletion().CodeCompleteOrdinaryName(S: getCurScope(), CompletionContext: PCC);
919	return nullptr;
920	case tok::kw_import: {
921	Sema::ModuleImportState IS = Sema::ModuleImportState::NotACXX20Module;
922	if (getLangOpts().CPlusPlusModules) {
923	llvm_unreachable("not expecting a c++20 import here");
924	ProhibitAttributes(Attrs);
925	}
926	SingleDecl = ParseModuleImport(AtLoc: SourceLocation(), ImportState&: IS);
927	} break;
928	case tok::kw_export:
929	if (getLangOpts().CPlusPlusModules || getLangOpts().HLSL) {
930	ProhibitAttributes(Attrs);
931	SingleDecl = ParseExportDeclaration();
932	break;
933	}
934	// This must be 'export template'. Parse it so we can diagnose our lack
935	// of support.
936	[[fallthrough]];
937	case tok::kw_using:
938	case tok::kw_namespace:
939	case tok::kw_typedef:
940	case tok::kw_template:
941	case tok::kw_static_assert:
942	case tok::kw__Static_assert:
943	// A function definition cannot start with any of these keywords.
944	{
945	SourceLocation DeclEnd;
946	return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
947	DeclSpecAttrs);
948	}
949
950	case tok::kw_cbuffer:
951	case tok::kw_tbuffer:
952	if (getLangOpts().HLSL) {
953	SourceLocation DeclEnd;
954	return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
955	DeclSpecAttrs);
956	}
957	goto dont_know;
958
959	case tok::kw_static:
960	// Parse (then ignore) 'static' prior to a template instantiation. This is
961	// a GCC extension that we intentionally do not support.
962	if (getLangOpts().CPlusPlus && NextToken().is(K: tok::kw_template)) {
963	Diag(Loc: ConsumeToken(), DiagID: diag::warn_static_inline_explicit_inst_ignored)
964	<< 0;
965	SourceLocation DeclEnd;
966	return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
967	DeclSpecAttrs);
968	}
969	goto dont_know;
970
971	case tok::kw_inline:
972	if (getLangOpts().CPlusPlus) {
973	tok::TokenKind NextKind = NextToken().getKind();
974
975	// Inline namespaces. Allowed as an extension even in C++03.
976	if (NextKind == tok::kw_namespace) {
977	SourceLocation DeclEnd;
978	return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
979	DeclSpecAttrs);
980	}
981
982	// Parse (then ignore) 'inline' prior to a template instantiation. This is
983	// a GCC extension that we intentionally do not support.
984	if (NextKind == tok::kw_template) {
985	Diag(Loc: ConsumeToken(), DiagID: diag::warn_static_inline_explicit_inst_ignored)
986	<< 1;
987	SourceLocation DeclEnd;
988	return ParseDeclaration(Context: DeclaratorContext::File, DeclEnd, DeclAttrs&: Attrs,
989	DeclSpecAttrs);
990	}
991	}
992	goto dont_know;
993
994	case tok::kw_extern:
995	if (getLangOpts().CPlusPlus && NextToken().is(K: tok::kw_template)) {
996	ProhibitAttributes(Attrs);
997	ProhibitAttributes(Attrs&: DeclSpecAttrs);
998	// Extern templates
999	SourceLocation ExternLoc = ConsumeToken();
1000	SourceLocation TemplateLoc = ConsumeToken();
1001	Diag(Loc: ExternLoc, DiagID: getLangOpts().CPlusPlus11 ?
1002	diag::warn_cxx98_compat_extern_template :
1003	diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
1004	SourceLocation DeclEnd;
1005	return ParseExplicitInstantiation(Context: DeclaratorContext::File, ExternLoc,
1006	TemplateLoc, DeclEnd, AccessAttrs&: Attrs);
1007	}
1008	goto dont_know;
1009
1010	case tok::kw___if_exists:
1011	case tok::kw___if_not_exists:
1012	ParseMicrosoftIfExistsExternalDeclaration();
1013	return nullptr;
1014
1015	case tok::kw_module:
1016	Diag(Tok, DiagID: diag::err_unexpected_module_decl);
1017	SkipUntil(T: tok::semi);
1018	return nullptr;
1019
1020	default:
1021	dont_know:
1022	if (Tok.isEditorPlaceholder()) {
1023	ConsumeToken();
1024	return nullptr;
1025	}
1026	if (getLangOpts().IncrementalExtensions &&
1027	!isDeclarationStatement(/*DisambiguatingWithExpression=*/true))
1028	return ParseTopLevelStmtDecl();
1029
1030	// We can't tell whether this is a function-definition or declaration yet.
1031	if (!SingleDecl)
1032	return ParseDeclarationOrFunctionDefinition(DeclAttrs&: Attrs, DeclSpecAttrs, DS);
1033	}
1034
1035	// This routine returns a DeclGroup, if the thing we parsed only contains a
1036	// single decl, convert it now.
1037	return Actions.ConvertDeclToDeclGroup(Ptr: SingleDecl);
1038	}
1039
1040	bool Parser::isDeclarationAfterDeclarator() {
1041	// Check for '= delete' or '= default'
1042	if (getLangOpts().CPlusPlus && Tok.is(K: tok::equal)) {
1043	const Token &KW = NextToken();
1044	if (KW.is(K: tok::kw_default) || KW.is(K: tok::kw_delete))
1045	return false;
1046	}
1047
1048	return Tok.is(K: tok::equal) || // int X()= -> not a function def
1049	Tok.is(K: tok::comma) || // int X(), -> not a function def
1050	Tok.is(K: tok::semi) || // int X(); -> not a function def
1051	Tok.is(K: tok::kw_asm) || // int X() __asm__ -> not a function def
1052	Tok.is(K: tok::kw___attribute) || // int X() __attr__ -> not a function def
1053	(getLangOpts().CPlusPlus &&
1054	Tok.is(K: tok::l_paren)); // int X(0) -> not a function def [C++]
1055	}
1056
1057	bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
1058	assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
1059	if (Tok.is(K: tok::l_brace)) // int X() {}
1060	return true;
1061
1062	// Handle K&R C argument lists: int X(f) int f; {}
1063	if (!getLangOpts().CPlusPlus &&
1064	Declarator.getFunctionTypeInfo().isKNRPrototype())
1065	return isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No);
1066
1067	if (getLangOpts().CPlusPlus && Tok.is(K: tok::equal)) {
1068	const Token &KW = NextToken();
1069	return KW.is(K: tok::kw_default) || KW.is(K: tok::kw_delete);
1070	}
1071
1072	return Tok.is(K: tok::colon) || // X() : Base() {} (used for ctors)
1073	Tok.is(K: tok::kw_try); // X() try { ... }
1074	}
1075
1076	Parser::DeclGroupPtrTy Parser::ParseDeclOrFunctionDefInternal(
1077	ParsedAttributes &Attrs, ParsedAttributes &DeclSpecAttrs,
1078	ParsingDeclSpec &DS, AccessSpecifier AS) {
1079	// Because we assume that the DeclSpec has not yet been initialised, we simply
1080	// overwrite the source range and attribute the provided leading declspec
1081	// attributes.
1082	assert(DS.getSourceRange().isInvalid() &&
1083	"expected uninitialised source range");
1084	DS.SetRangeStart(DeclSpecAttrs.Range.getBegin());
1085	DS.SetRangeEnd(DeclSpecAttrs.Range.getEnd());
1086	DS.takeAttributesFrom(attrs&: DeclSpecAttrs);
1087
1088	ParsedTemplateInfo TemplateInfo;
1089	MaybeParseMicrosoftAttributes(Attrs&: DS.getAttributes());
1090	// Parse the common declaration-specifiers piece.
1091	ParseDeclarationSpecifiers(DS, TemplateInfo, AS,
1092	DSC: DeclSpecContext::DSC_top_level);
1093
1094	// If we had a free-standing type definition with a missing semicolon, we
1095	// may get this far before the problem becomes obvious.
1096	if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
1097	DS, AS, DSContext: DeclSpecContext::DSC_top_level))
1098	return nullptr;
1099
1100	// C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1101	// declaration-specifiers init-declarator-list[opt] ';'
1102	if (Tok.is(K: tok::semi)) {
1103	auto LengthOfTSTToken = [](DeclSpec::TST TKind) {
1104	assert(DeclSpec::isDeclRep(TKind));
1105	switch(TKind) {
1106	case DeclSpec::TST_class:
1107	return 5;
1108	case DeclSpec::TST_struct:
1109	return 6;
1110	case DeclSpec::TST_union:
1111	return 5;
1112	case DeclSpec::TST_enum:
1113	return 4;
1114	case DeclSpec::TST_interface:
1115	return 9;
1116	default:
1117	llvm_unreachable("we only expect to get the length of the class/struct/union/enum");
1118	}
1119
1120	};
1121	// Suggest correct location to fix '[[attrib]] struct' to 'struct [[attrib]]'
1122	SourceLocation CorrectLocationForAttributes =
1123	DeclSpec::isDeclRep(T: DS.getTypeSpecType())
1124	? DS.getTypeSpecTypeLoc().getLocWithOffset(
1125	Offset: LengthOfTSTToken(DS.getTypeSpecType()))
1126	: SourceLocation();
1127	ProhibitAttributes(Attrs, FixItLoc: CorrectLocationForAttributes);
1128	ConsumeToken();
1129	RecordDecl *AnonRecord = nullptr;
1130	Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(
1131	S: getCurScope(), AS: AS_none, DS, DeclAttrs: ParsedAttributesView::none(), AnonRecord);
1132	DS.complete(D: TheDecl);
1133	Actions.ActOnDefinedDeclarationSpecifier(D: TheDecl);
1134	if (AnonRecord) {
1135	Decl* decls[] = {AnonRecord, TheDecl};
1136	return Actions.BuildDeclaratorGroup(Group: decls);
1137	}
1138	return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
1139	}
1140
1141	if (DS.hasTagDefinition())
1142	Actions.ActOnDefinedDeclarationSpecifier(D: DS.getRepAsDecl());
1143
1144	// ObjC2 allows prefix attributes on class interfaces and protocols.
1145	// FIXME: This still needs better diagnostics. We should only accept
1146	// attributes here, no types, etc.
1147	if (getLangOpts().ObjC && Tok.is(K: tok::at)) {
1148	SourceLocation AtLoc = ConsumeToken(); // the "@"
1149	if (!Tok.isObjCAtKeyword(objcKey: tok::objc_interface) &&
1150	!Tok.isObjCAtKeyword(objcKey: tok::objc_protocol) &&
1151	!Tok.isObjCAtKeyword(objcKey: tok::objc_implementation)) {
1152	Diag(Tok, DiagID: diag::err_objc_unexpected_attr);
1153	SkipUntil(T: tok::semi);
1154	return nullptr;
1155	}
1156
1157	DS.abort();
1158	DS.takeAttributesFrom(attrs&: Attrs);
1159
1160	const char *PrevSpec = nullptr;
1161	unsigned DiagID;
1162	if (DS.SetTypeSpecType(T: DeclSpec::TST_unspecified, Loc: AtLoc, PrevSpec, DiagID,
1163	Policy: Actions.getASTContext().getPrintingPolicy()))
1164	Diag(Loc: AtLoc, DiagID) << PrevSpec;
1165
1166	if (Tok.isObjCAtKeyword(objcKey: tok::objc_protocol))
1167	return ParseObjCAtProtocolDeclaration(atLoc: AtLoc, prefixAttrs&: DS.getAttributes());
1168
1169	if (Tok.isObjCAtKeyword(objcKey: tok::objc_implementation))
1170	return ParseObjCAtImplementationDeclaration(AtLoc, Attrs&: DS.getAttributes());
1171
1172	return Actions.ConvertDeclToDeclGroup(
1173	Ptr: ParseObjCAtInterfaceDeclaration(AtLoc, prefixAttrs&: DS.getAttributes()));
1174	}
1175
1176	// If the declspec consisted only of 'extern' and we have a string
1177	// literal following it, this must be a C++ linkage specifier like
1178	// 'extern "C"'.
1179	if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
1180	DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
1181	DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
1182	ProhibitAttributes(Attrs);
1183	Decl *TheDecl = ParseLinkage(DS, Context: DeclaratorContext::File);
1184	return Actions.ConvertDeclToDeclGroup(Ptr: TheDecl);
1185	}
1186
1187	return ParseDeclGroup(DS, Context: DeclaratorContext::File, Attrs, TemplateInfo);
1188	}
1189
1190	Parser::DeclGroupPtrTy Parser::ParseDeclarationOrFunctionDefinition(
1191	ParsedAttributes &Attrs, ParsedAttributes &DeclSpecAttrs,
1192	ParsingDeclSpec *DS, AccessSpecifier AS) {
1193	// Add an enclosing time trace scope for a bunch of small scopes with
1194	// "EvaluateAsConstExpr".
1195	llvm::TimeTraceScope TimeScope("ParseDeclarationOrFunctionDefinition", [&]() {
1196	return Tok.getLocation().printToString(
1197	SM: Actions.getASTContext().getSourceManager());
1198	});
1199
1200	if (DS) {
1201	return ParseDeclOrFunctionDefInternal(Attrs, DeclSpecAttrs, DS&: *DS, AS);
1202	} else {
1203	ParsingDeclSpec PDS(*this);
1204	// Must temporarily exit the objective-c container scope for
1205	// parsing c constructs and re-enter objc container scope
1206	// afterwards.
1207	ObjCDeclContextSwitch ObjCDC(*this);
1208
1209	return ParseDeclOrFunctionDefInternal(Attrs, DeclSpecAttrs, DS&: PDS, AS);
1210	}
1211	}
1212
1213	Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1214	const ParsedTemplateInfo &TemplateInfo,
1215	LateParsedAttrList *LateParsedAttrs) {
1216	llvm::TimeTraceScope TimeScope("ParseFunctionDefinition", [&]() {
1217	return Actions.GetNameForDeclarator(D).getName().getAsString();
1218	});
1219
1220	// Poison SEH identifiers so they are flagged as illegal in function bodies.
1221	PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1222	const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1223	TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1224
1225	// If this is C89 and the declspecs were completely missing, fudge in an
1226	// implicit int. We do this here because this is the only place where
1227	// declaration-specifiers are completely optional in the grammar.
1228	if (getLangOpts().isImplicitIntRequired() && D.getDeclSpec().isEmpty()) {
1229	Diag(Loc: D.getIdentifierLoc(), DiagID: diag::warn_missing_type_specifier)
1230	<< D.getDeclSpec().getSourceRange();
1231	const char *PrevSpec;
1232	unsigned DiagID;
1233	const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1234	D.getMutableDeclSpec().SetTypeSpecType(T: DeclSpec::TST_int,
1235	Loc: D.getIdentifierLoc(),
1236	PrevSpec, DiagID,
1237	Policy);
1238	D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1239	}
1240
1241	// If this declaration was formed with a K&R-style identifier list for the
1242	// arguments, parse declarations for all of the args next.
1243	// int foo(a,b) int a; float b; {}
1244	if (FTI.isKNRPrototype())
1245	ParseKNRParamDeclarations(D);
1246
1247	// We should have either an opening brace or, in a C++ constructor,
1248	// we may have a colon.
1249	if (Tok.isNot(K: tok::l_brace) &&
1250	(!getLangOpts().CPlusPlus ||
1251	(Tok.isNot(K: tok::colon) && Tok.isNot(K: tok::kw_try) &&
1252	Tok.isNot(K: tok::equal)))) {
1253	Diag(Tok, DiagID: diag::err_expected_fn_body);
1254
1255	// Skip over garbage, until we get to '{'. Don't eat the '{'.
1256	SkipUntil(T: tok::l_brace, Flags: StopAtSemi | StopBeforeMatch);
1257
1258	// If we didn't find the '{', bail out.
1259	if (Tok.isNot(K: tok::l_brace))
1260	return nullptr;
1261	}
1262
1263	// Check to make sure that any normal attributes are allowed to be on
1264	// a definition. Late parsed attributes are checked at the end.
1265	if (Tok.isNot(K: tok::equal)) {
1266	for (const ParsedAttr &AL : D.getAttributes())
1267	if (AL.isKnownToGCC() && !AL.isStandardAttributeSyntax())
1268	Diag(Loc: AL.getLoc(), DiagID: diag::warn_attribute_on_function_definition) << AL;
1269	}
1270
1271	// In delayed template parsing mode, for function template we consume the
1272	// tokens and store them for late parsing at the end of the translation unit.
1273	if (getLangOpts().DelayedTemplateParsing && Tok.isNot(K: tok::equal) &&
1274	TemplateInfo.Kind == ParsedTemplateKind::Template &&
1275	Actions.canDelayFunctionBody(D)) {
1276	MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1277
1278	ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1279	Scope::CompoundStmtScope);
1280	Scope *ParentScope = getCurScope()->getParent();
1281
1282	D.setFunctionDefinitionKind(FunctionDefinitionKind::Definition);
1283	Decl *DP = Actions.HandleDeclarator(S: ParentScope, D,
1284	TemplateParameterLists);
1285	D.complete(D: DP);
1286	D.getMutableDeclSpec().abort();
1287
1288	if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(D: DP)) &&
1289	trySkippingFunctionBody()) {
1290	BodyScope.Exit();
1291	return Actions.ActOnSkippedFunctionBody(Decl: DP);
1292	}
1293
1294	CachedTokens Toks;
1295	LexTemplateFunctionForLateParsing(Toks);
1296
1297	if (DP) {
1298	FunctionDecl *FnD = DP->getAsFunction();
1299	Actions.CheckForFunctionRedefinition(FD: FnD);
1300	Actions.MarkAsLateParsedTemplate(FD: FnD, FnD: DP, Toks);
1301	}
1302	return DP;
1303	}
1304	else if (CurParsedObjCImpl &&
1305	!TemplateInfo.TemplateParams &&
1306	(Tok.is(K: tok::l_brace) || Tok.is(K: tok::kw_try) ||
1307	Tok.is(K: tok::colon)) &&
1308	Actions.CurContext->isTranslationUnit()) {
1309	ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1310	Scope::CompoundStmtScope);
1311	Scope *ParentScope = getCurScope()->getParent();
1312
1313	D.setFunctionDefinitionKind(FunctionDefinitionKind::Definition);
1314	Decl *FuncDecl = Actions.HandleDeclarator(S: ParentScope, D,
1315	TemplateParameterLists: MultiTemplateParamsArg());
1316	D.complete(D: FuncDecl);
1317	D.getMutableDeclSpec().abort();
1318	if (FuncDecl) {
1319	// Consume the tokens and store them for later parsing.
1320	StashAwayMethodOrFunctionBodyTokens(MDecl: FuncDecl);
1321	CurParsedObjCImpl->HasCFunction = true;
1322	return FuncDecl;
1323	}
1324	// FIXME: Should we really fall through here?
1325	}
1326
1327	// Enter a scope for the function body.
1328	ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1329	Scope::CompoundStmtScope);
1330
1331	// Parse function body eagerly if it is either '= delete;' or '= default;' as
1332	// ActOnStartOfFunctionDef needs to know whether the function is deleted.
1333	StringLiteral *DeletedMessage = nullptr;
1334	Sema::FnBodyKind BodyKind = Sema::FnBodyKind::Other;
1335	SourceLocation KWLoc;
1336	if (TryConsumeToken(Expected: tok::equal)) {
1337	assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1338
1339	if (TryConsumeToken(Expected: tok::kw_delete, Loc&: KWLoc)) {
1340	Diag(Loc: KWLoc, DiagID: getLangOpts().CPlusPlus11
1341	? diag::warn_cxx98_compat_defaulted_deleted_function
1342	: diag::ext_defaulted_deleted_function)
1343	<< 1 /* deleted */;
1344	BodyKind = Sema::FnBodyKind::Delete;
1345	DeletedMessage = ParseCXXDeletedFunctionMessage();
1346	} else if (TryConsumeToken(Expected: tok::kw_default, Loc&: KWLoc)) {
1347	Diag(Loc: KWLoc, DiagID: getLangOpts().CPlusPlus11
1348	? diag::warn_cxx98_compat_defaulted_deleted_function
1349	: diag::ext_defaulted_deleted_function)
1350	<< 0 /* defaulted */;
1351	BodyKind = Sema::FnBodyKind::Default;
1352	} else {
1353	llvm_unreachable("function definition after = not 'delete' or 'default'");
1354	}
1355
1356	if (Tok.is(K: tok::comma)) {
1357	Diag(Loc: KWLoc, DiagID: diag::err_default_delete_in_multiple_declaration)
1358	<< (BodyKind == Sema::FnBodyKind::Delete);
1359	SkipUntil(T: tok::semi);
1360	} else if (ExpectAndConsume(ExpectedTok: tok::semi, DiagID: diag::err_expected_after,
1361	Msg: BodyKind == Sema::FnBodyKind::Delete
1362	? "delete"
1363	: "default")) {
1364	SkipUntil(T: tok::semi);
1365	}
1366	}
1367
1368	Sema::FPFeaturesStateRAII SaveFPFeatures(Actions);
1369
1370	// Tell the actions module that we have entered a function definition with the
1371	// specified Declarator for the function.
1372	SkipBodyInfo SkipBody;
1373	Decl *Res = Actions.ActOnStartOfFunctionDef(S: getCurScope(), D,
1374	TemplateParamLists: TemplateInfo.TemplateParams
1375	? *TemplateInfo.TemplateParams
1376	: MultiTemplateParamsArg(),
1377	SkipBody: &SkipBody, BodyKind);
1378
1379	if (SkipBody.ShouldSkip) {
1380	// Do NOT enter SkipFunctionBody if we already consumed the tokens.
1381	if (BodyKind == Sema::FnBodyKind::Other)
1382	SkipFunctionBody();
1383
1384	// ExpressionEvaluationContext is pushed in ActOnStartOfFunctionDef
1385	// and it would be popped in ActOnFinishFunctionBody.
1386	// We pop it explcitly here since ActOnFinishFunctionBody won't get called.
1387	//
1388	// Do not call PopExpressionEvaluationContext() if it is a lambda because
1389	// one is already popped when finishing the lambda in BuildLambdaExpr().
1390	//
1391	// FIXME: It looks not easy to balance PushExpressionEvaluationContext()
1392	// and PopExpressionEvaluationContext().
1393	if (!isLambdaCallOperator(DC: dyn_cast_if_present<FunctionDecl>(Val: Res)))
1394	Actions.PopExpressionEvaluationContext();
1395	return Res;
1396	}
1397
1398	// Break out of the ParsingDeclarator context before we parse the body.
1399	D.complete(D: Res);
1400
1401	// Break out of the ParsingDeclSpec context, too. This const_cast is
1402	// safe because we're always the sole owner.
1403	D.getMutableDeclSpec().abort();
1404
1405	if (BodyKind != Sema::FnBodyKind::Other) {
1406	Actions.SetFunctionBodyKind(D: Res, Loc: KWLoc, BodyKind, DeletedMessage);
1407	Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1408	Actions.ActOnFinishFunctionBody(Decl: Res, Body: GeneratedBody, IsInstantiation: false);
1409	return Res;
1410	}
1411
1412	// With abbreviated function templates - we need to explicitly add depth to
1413	// account for the implicit template parameter list induced by the template.
1414	if (const auto *Template = dyn_cast_if_present<FunctionTemplateDecl>(Val: Res);
1415	Template && Template->isAbbreviated() &&
1416	Template->getTemplateParameters()->getParam(Idx: 0)->isImplicit())
1417	// First template parameter is implicit - meaning no explicit template
1418	// parameter list was specified.
1419	CurTemplateDepthTracker.addDepth(D: 1);
1420
1421	if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(D: Res)) &&
1422	trySkippingFunctionBody()) {
1423	BodyScope.Exit();
1424	Actions.ActOnSkippedFunctionBody(Decl: Res);
1425	return Actions.ActOnFinishFunctionBody(Decl: Res, Body: nullptr, IsInstantiation: false);
1426	}
1427
1428	if (Tok.is(K: tok::kw_try))
1429	return ParseFunctionTryBlock(Decl: Res, BodyScope);
1430
1431	// If we have a colon, then we're probably parsing a C++
1432	// ctor-initializer.
1433	if (Tok.is(K: tok::colon)) {
1434	ParseConstructorInitializer(ConstructorDecl: Res);
1435
1436	// Recover from error.
1437	if (!Tok.is(K: tok::l_brace)) {
1438	BodyScope.Exit();
1439	Actions.ActOnFinishFunctionBody(Decl: Res, Body: nullptr);
1440	return Res;
1441	}
1442	} else
1443	Actions.ActOnDefaultCtorInitializers(CDtorDecl: Res);
1444
1445	// Late attributes are parsed in the same scope as the function body.
1446	if (LateParsedAttrs)
1447	ParseLexedAttributeList(LAs&: *LateParsedAttrs, D: Res, EnterScope: false, OnDefinition: true);
1448
1449	return ParseFunctionStatementBody(Decl: Res, BodyScope);
1450	}
1451
1452	void Parser::SkipFunctionBody() {
1453	if (Tok.is(K: tok::equal)) {
1454	SkipUntil(T: tok::semi);
1455	return;
1456	}
1457
1458	bool IsFunctionTryBlock = Tok.is(K: tok::kw_try);
1459	if (IsFunctionTryBlock)
1460	ConsumeToken();
1461
1462	CachedTokens Skipped;
1463	if (ConsumeAndStoreFunctionPrologue(Toks&: Skipped))
1464	SkipMalformedDecl();
1465	else {
1466	SkipUntil(T: tok::r_brace);
1467	while (IsFunctionTryBlock && Tok.is(K: tok::kw_catch)) {
1468	SkipUntil(T: tok::l_brace);
1469	SkipUntil(T: tok::r_brace);
1470	}
1471	}
1472	}
1473
1474	void Parser::ParseKNRParamDeclarations(Declarator &D) {
1475	// We know that the top-level of this declarator is a function.
1476	DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1477
1478	// Enter function-declaration scope, limiting any declarators to the
1479	// function prototype scope, including parameter declarators.
1480	ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1481	Scope::FunctionDeclarationScope | Scope::DeclScope);
1482
1483	// Read all the argument declarations.
1484	while (isDeclarationSpecifier(AllowImplicitTypename: ImplicitTypenameContext::No)) {
1485	SourceLocation DSStart = Tok.getLocation();
1486
1487	// Parse the common declaration-specifiers piece.
1488	DeclSpec DS(AttrFactory);
1489	ParsedTemplateInfo TemplateInfo;
1490	ParseDeclarationSpecifiers(DS, TemplateInfo);
1491
1492	// C99 6.9.1p6: 'each declaration in the declaration list shall have at
1493	// least one declarator'.
1494	// NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1495	// the declarations though. It's trivial to ignore them, really hard to do
1496	// anything else with them.
1497	if (TryConsumeToken(Expected: tok::semi)) {
1498	Diag(Loc: DSStart, DiagID: diag::err_declaration_does_not_declare_param);
1499	continue;
1500	}
1501
1502	// C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1503	// than register.
1504	if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1505	DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1506	Diag(Loc: DS.getStorageClassSpecLoc(),
1507	DiagID: diag::err_invalid_storage_class_in_func_decl);
1508	DS.ClearStorageClassSpecs();
1509	}
1510	if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1511	Diag(Loc: DS.getThreadStorageClassSpecLoc(),
1512	DiagID: diag::err_invalid_storage_class_in_func_decl);
1513	DS.ClearStorageClassSpecs();
1514	}
1515
1516	// Parse the first declarator attached to this declspec.
1517	Declarator ParmDeclarator(DS, ParsedAttributesView::none(),
1518	DeclaratorContext::KNRTypeList);
1519	ParseDeclarator(D&: ParmDeclarator);
1520
1521	// Handle the full declarator list.
1522	while (true) {
1523	// If attributes are present, parse them.
1524	MaybeParseGNUAttributes(D&: ParmDeclarator);
1525
1526	// Ask the actions module to compute the type for this declarator.
1527	Decl *Param =
1528	Actions.ActOnParamDeclarator(S: getCurScope(), D&: ParmDeclarator);
1529
1530	if (Param &&
1531	// A missing identifier has already been diagnosed.
1532	ParmDeclarator.getIdentifier()) {
1533
1534	// Scan the argument list looking for the correct param to apply this
1535	// type.
1536	for (unsigned i = 0; ; ++i) {
1537	// C99 6.9.1p6: those declarators shall declare only identifiers from
1538	// the identifier list.
1539	if (i == FTI.NumParams) {
1540	Diag(Loc: ParmDeclarator.getIdentifierLoc(), DiagID: diag::err_no_matching_param)
1541	<< ParmDeclarator.getIdentifier();
1542	break;
1543	}
1544
1545	if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1546	// Reject redefinitions of parameters.
1547	if (FTI.Params[i].Param) {
1548	Diag(Loc: ParmDeclarator.getIdentifierLoc(),
1549	DiagID: diag::err_param_redefinition)
1550	<< ParmDeclarator.getIdentifier();
1551	} else {
1552	FTI.Params[i].Param = Param;
1553	}
1554	break;
1555	}
1556	}
1557	}
1558
1559	// If we don't have a comma, it is either the end of the list (a ';') or
1560	// an error, bail out.
1561	if (Tok.isNot(K: tok::comma))
1562	break;
1563
1564	ParmDeclarator.clear();
1565
1566	// Consume the comma.
1567	ParmDeclarator.setCommaLoc(ConsumeToken());
1568
1569	// Parse the next declarator.
1570	ParseDeclarator(D&: ParmDeclarator);
1571	}
1572
1573	// Consume ';' and continue parsing.
1574	if (!ExpectAndConsumeSemi(DiagID: diag::err_expected_semi_declaration))
1575	continue;
1576
1577	// Otherwise recover by skipping to next semi or mandatory function body.
1578	if (SkipUntil(T: tok::l_brace, Flags: StopAtSemi | StopBeforeMatch))
1579	break;
1580	TryConsumeToken(Expected: tok::semi);
1581	}
1582
1583	// The actions module must verify that all arguments were declared.
1584	Actions.ActOnFinishKNRParamDeclarations(S: getCurScope(), D, LocAfterDecls: Tok.getLocation());
1585	}
1586
1587	ExprResult Parser::ParseAsmStringLiteral(bool ForAsmLabel) {
1588
1589	ExprResult AsmString;
1590	if (isTokenStringLiteral()) {
1591	AsmString = ParseStringLiteralExpression();
1592	if (AsmString.isInvalid())
1593	return AsmString;
1594
1595	const auto *SL = cast<StringLiteral>(Val: AsmString.get());
1596	if (!SL->isOrdinary()) {
1597	Diag(Tok, DiagID: diag::err_asm_operand_wide_string_literal)
1598	<< SL->isWide() << SL->getSourceRange();
1599	return ExprError();
1600	}
1601	} else if (!ForAsmLabel && getLangOpts().CPlusPlus11 &&
1602	Tok.is(K: tok::l_paren)) {
1603	ParenParseOption ExprType = ParenParseOption::SimpleExpr;
1604	SourceLocation RParenLoc;
1605	ParsedType CastTy;
1606
1607	EnterExpressionEvaluationContext ConstantEvaluated(
1608	Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
1609	AsmString = ParseParenExpression(
1610	ExprType, /*StopIfCastExr=*/StopIfCastExpr: true, ParenBehavior: ParenExprKind::Unknown,
1611	CorrectionBehavior: TypoCorrectionTypeBehavior::AllowBoth, CastTy, RParenLoc);
1612	if (!AsmString.isInvalid())
1613	AsmString = Actions.ActOnConstantExpression(Res: AsmString);
1614
1615	if (AsmString.isInvalid())
1616	return ExprError();
1617	} else {
1618	Diag(Tok, DiagID: diag::err_asm_expected_string) << /*and expression=*/(
1619	(getLangOpts().CPlusPlus11 && !ForAsmLabel) ? 0 : 1);
1620	}
1621
1622	return Actions.ActOnGCCAsmStmtString(Stm: AsmString.get(), ForAsmLabel);
1623	}
1624
1625	ExprResult Parser::ParseSimpleAsm(bool ForAsmLabel, SourceLocation *EndLoc) {
1626	assert(Tok.is(tok::kw_asm) && "Not an asm!");
1627	SourceLocation Loc = ConsumeToken();
1628
1629	if (isGNUAsmQualifier(TokAfterAsm: Tok)) {
1630	// Remove from the end of 'asm' to the end of the asm qualifier.
1631	SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1632	PP.getLocForEndOfToken(Loc: Tok.getLocation()));
1633	Diag(Tok, DiagID: diag::err_global_asm_qualifier_ignored)
1634	<< GNUAsmQualifiers::getQualifierName(Qualifier: getGNUAsmQualifier(Tok))
1635	<< FixItHint::CreateRemoval(RemoveRange: RemovalRange);
1636	ConsumeToken();
1637	}
1638
1639	BalancedDelimiterTracker T(*this, tok::l_paren);
1640	if (T.consumeOpen()) {
1641	Diag(Tok, DiagID: diag::err_expected_lparen_after) << "asm";
1642	return ExprError();
1643	}
1644
1645	ExprResult Result(ParseAsmStringLiteral(ForAsmLabel));
1646
1647	if (!Result.isInvalid()) {
1648	// Close the paren and get the location of the end bracket
1649	T.consumeClose();
1650	if (EndLoc)
1651	*EndLoc = T.getCloseLocation();
1652	} else if (SkipUntil(T: tok::r_paren, Flags: StopAtSemi | StopBeforeMatch)) {
1653	if (EndLoc)
1654	*EndLoc = Tok.getLocation();
1655	ConsumeParen();
1656	}
1657
1658	return Result;
1659	}
1660
1661	TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1662	assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1663	TemplateIdAnnotation *
1664	Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1665	return Id;
1666	}
1667
1668	void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1669	// Push the current token back into the token stream (or revert it if it is
1670	// cached) and use an annotation scope token for current token.
1671	if (PP.isBacktrackEnabled())
1672	PP.RevertCachedTokens(N: 1);
1673	else
1674	PP.EnterToken(Tok, /*IsReinject=*/true);
1675	Tok.setKind(tok::annot_cxxscope);
1676	Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1677	Tok.setAnnotationRange(SS.getRange());
1678
1679	// In case the tokens were cached, have Preprocessor replace them
1680	// with the annotation token. We don't need to do this if we've
1681	// just reverted back to a prior state.
1682	if (IsNewAnnotation)
1683	PP.AnnotateCachedTokens(Tok);
1684	}
1685
1686	AnnotatedNameKind
1687	Parser::TryAnnotateName(CorrectionCandidateCallback *CCC,
1688	ImplicitTypenameContext AllowImplicitTypename) {
1689	assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1690
1691	const bool EnteringContext = false;
1692	const bool WasScopeAnnotation = Tok.is(K: tok::annot_cxxscope);
1693
1694	CXXScopeSpec SS;
1695	if (getLangOpts().CPlusPlus &&
1696	ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1697	/*ObjectHasErrors=*/false,
1698	EnteringContext))
1699	return AnnotatedNameKind::Error;
1700
1701	if (Tok.isNot(K: tok::identifier) || SS.isInvalid()) {
1702	if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
1703	AllowImplicitTypename))
1704	return AnnotatedNameKind::Error;
1705	return AnnotatedNameKind::Unresolved;
1706	}
1707
1708	IdentifierInfo *Name = Tok.getIdentifierInfo();
1709	SourceLocation NameLoc = Tok.getLocation();
1710
1711	// FIXME: Move the tentative declaration logic into ClassifyName so we can
1712	// typo-correct to tentatively-declared identifiers.
1713	if (isTentativelyDeclared(II: Name) && SS.isEmpty()) {
1714	// Identifier has been tentatively declared, and thus cannot be resolved as
1715	// an expression. Fall back to annotating it as a type.
1716	if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
1717	AllowImplicitTypename))
1718	return AnnotatedNameKind::Error;
1719	return Tok.is(K: tok::annot_typename) ? AnnotatedNameKind::Success
1720	: AnnotatedNameKind::TentativeDecl;
1721	}
1722
1723	Token Next = NextToken();
1724
1725	// Look up and classify the identifier. We don't perform any typo-correction
1726	// after a scope specifier, because in general we can't recover from typos
1727	// there (eg, after correcting 'A::template B<X>::C' [sic], we would need to
1728	// jump back into scope specifier parsing).
1729	Sema::NameClassification Classification = Actions.ClassifyName(
1730	S: getCurScope(), SS, Name, NameLoc, NextToken: Next, CCC: SS.isEmpty() ? CCC : nullptr);
1731
1732	// If name lookup found nothing and we guessed that this was a template name,
1733	// double-check before committing to that interpretation. C++20 requires that
1734	// we interpret this as a template-id if it can be, but if it can't be, then
1735	// this is an error recovery case.
1736	if (Classification.getKind() == NameClassificationKind::UndeclaredTemplate &&
1737	isTemplateArgumentList(TokensToSkip: 1) == TPResult::False) {
1738	// It's not a template-id; re-classify without the '<' as a hint.
1739	Token FakeNext = Next;
1740	FakeNext.setKind(tok::unknown);
1741	Classification =
1742	Actions.ClassifyName(S: getCurScope(), SS, Name, NameLoc, NextToken: FakeNext,
1743	CCC: SS.isEmpty() ? CCC : nullptr);
1744	}
1745
1746	switch (Classification.getKind()) {
1747	case NameClassificationKind::Error:
1748	return AnnotatedNameKind::Error;
1749
1750	case NameClassificationKind::Keyword:
1751	// The identifier was typo-corrected to a keyword.
1752	Tok.setIdentifierInfo(Name);
1753	Tok.setKind(Name->getTokenID());
1754	PP.TypoCorrectToken(Tok);
1755	if (SS.isNotEmpty())
1756	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1757	// We've "annotated" this as a keyword.
1758	return AnnotatedNameKind::Success;
1759
1760	case NameClassificationKind::Unknown:
1761	// It's not something we know about. Leave it unannotated.
1762	break;
1763
1764	case NameClassificationKind::Type: {
1765	if (TryAltiVecVectorToken())
1766	// vector has been found as a type id when altivec is enabled but
1767	// this is followed by a declaration specifier so this is really the
1768	// altivec vector token. Leave it unannotated.
1769	break;
1770	SourceLocation BeginLoc = NameLoc;
1771	if (SS.isNotEmpty())
1772	BeginLoc = SS.getBeginLoc();
1773
1774	/// An Objective-C object type followed by '<' is a specialization of
1775	/// a parameterized class type or a protocol-qualified type.
1776	ParsedType Ty = Classification.getType();
1777	if (getLangOpts().ObjC && NextToken().is(K: tok::less) &&
1778	(Ty.get()->isObjCObjectType() ||
1779	Ty.get()->isObjCObjectPointerType())) {
1780	// Consume the name.
1781	SourceLocation IdentifierLoc = ConsumeToken();
1782	SourceLocation NewEndLoc;
1783	TypeResult NewType
1784	= parseObjCTypeArgsAndProtocolQualifiers(loc: IdentifierLoc, type: Ty,
1785	/*consumeLastToken=*/false,
1786	endLoc&: NewEndLoc);
1787	if (NewType.isUsable())
1788	Ty = NewType.get();
1789	else if (Tok.is(K: tok::eof)) // Nothing to do here, bail out...
1790	return AnnotatedNameKind::Error;
1791	}
1792
1793	Tok.setKind(tok::annot_typename);
1794	setTypeAnnotation(Tok, T: Ty);
1795	Tok.setAnnotationEndLoc(Tok.getLocation());
1796	Tok.setLocation(BeginLoc);
1797	PP.AnnotateCachedTokens(Tok);
1798	return AnnotatedNameKind::Success;
1799	}
1800
1801	case NameClassificationKind::OverloadSet:
1802	Tok.setKind(tok::annot_overload_set);
1803	setExprAnnotation(Tok, ER: Classification.getExpression());
1804	Tok.setAnnotationEndLoc(NameLoc);
1805	if (SS.isNotEmpty())
1806	Tok.setLocation(SS.getBeginLoc());
1807	PP.AnnotateCachedTokens(Tok);
1808	return AnnotatedNameKind::Success;
1809
1810	case NameClassificationKind::NonType:
1811	if (TryAltiVecVectorToken())
1812	// vector has been found as a non-type id when altivec is enabled but
1813	// this is followed by a declaration specifier so this is really the
1814	// altivec vector token. Leave it unannotated.
1815	break;
1816	Tok.setKind(tok::annot_non_type);
1817	setNonTypeAnnotation(Tok, ND: Classification.getNonTypeDecl());
1818	Tok.setLocation(NameLoc);
1819	Tok.setAnnotationEndLoc(NameLoc);
1820	PP.AnnotateCachedTokens(Tok);
1821	if (SS.isNotEmpty())
1822	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1823	return AnnotatedNameKind::Success;
1824
1825	case NameClassificationKind::UndeclaredNonType:
1826	case NameClassificationKind::DependentNonType:
1827	Tok.setKind(Classification.getKind() ==
1828	NameClassificationKind::UndeclaredNonType
1829	? tok::annot_non_type_undeclared
1830	: tok::annot_non_type_dependent);
1831	setIdentifierAnnotation(Tok, ND: Name);
1832	Tok.setLocation(NameLoc);
1833	Tok.setAnnotationEndLoc(NameLoc);
1834	PP.AnnotateCachedTokens(Tok);
1835	if (SS.isNotEmpty())
1836	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1837	return AnnotatedNameKind::Success;
1838
1839	case NameClassificationKind::TypeTemplate:
1840	if (Next.isNot(K: tok::less)) {
1841	// This may be a type template being used as a template template argument.
1842	if (SS.isNotEmpty())
1843	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1844	return AnnotatedNameKind::TemplateName;
1845	}
1846	[[fallthrough]];
1847	case NameClassificationKind::Concept:
1848	case NameClassificationKind::VarTemplate:
1849	case NameClassificationKind::FunctionTemplate:
1850	case NameClassificationKind::UndeclaredTemplate: {
1851	bool IsConceptName =
1852	Classification.getKind() == NameClassificationKind::Concept;
1853	// We have a template name followed by '<'. Consume the identifier token so
1854	// we reach the '<' and annotate it.
1855	if (Next.is(K: tok::less))
1856	ConsumeToken();
1857	UnqualifiedId Id;
1858	Id.setIdentifier(Id: Name, IdLoc: NameLoc);
1859	if (AnnotateTemplateIdToken(
1860	Template: TemplateTy::make(P: Classification.getTemplateName()),
1861	TNK: Classification.getTemplateNameKind(), SS, TemplateKWLoc: SourceLocation(), TemplateName&: Id,
1862	/*AllowTypeAnnotation=*/!IsConceptName,
1863	/*TypeConstraint=*/IsConceptName))
1864	return AnnotatedNameKind::Error;
1865	if (SS.isNotEmpty())
1866	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1867	return AnnotatedNameKind::Success;
1868	}
1869	}
1870
1871	// Unable to classify the name, but maybe we can annotate a scope specifier.
1872	if (SS.isNotEmpty())
1873	AnnotateScopeToken(SS, IsNewAnnotation: !WasScopeAnnotation);
1874	return AnnotatedNameKind::Unresolved;
1875	}
1876
1877	SourceLocation Parser::getEndOfPreviousToken() const {
1878	SourceLocation TokenEndLoc = PP.getLocForEndOfToken(Loc: PrevTokLocation);
1879	return TokenEndLoc.isValid() ? TokenEndLoc : Tok.getLocation();
1880	}
1881
1882	bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1883	assert(Tok.isNot(tok::identifier));
1884	Diag(Tok, DiagID: diag::ext_keyword_as_ident)
1885	<< PP.getSpelling(Tok)
1886	<< DisableKeyword;
1887	if (DisableKeyword)
1888	Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1889	Tok.setKind(tok::identifier);
1890	return true;
1891	}
1892
1893	bool Parser::TryAnnotateTypeOrScopeToken(
1894	ImplicitTypenameContext AllowImplicitTypename) {
1895	assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1896	Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1897	Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1898	Tok.is(tok::kw___super) || Tok.is(tok::kw_auto) ||
1899	Tok.is(tok::annot_pack_indexing_type)) &&
1900	"Cannot be a type or scope token!");
1901
1902	if (Tok.is(K: tok::kw_typename)) {
1903	// MSVC lets you do stuff like:
1904	// typename typedef T_::D D;
1905	//
1906	// We will consume the typedef token here and put it back after we have
1907	// parsed the first identifier, transforming it into something more like:
1908	// typename T_::D typedef D;
1909	if (getLangOpts().MSVCCompat && NextToken().is(K: tok::kw_typedef)) {
1910	Token TypedefToken;
1911	PP.Lex(Result&: TypedefToken);
1912	bool Result = TryAnnotateTypeOrScopeToken(AllowImplicitTypename);
1913	PP.EnterToken(Tok, /*IsReinject=*/true);
1914	Tok = TypedefToken;
1915	if (!Result)
1916	Diag(Loc: Tok.getLocation(), DiagID: diag::warn_expected_qualified_after_typename);
1917	return Result;
1918	}
1919
1920	// Parse a C++ typename-specifier, e.g., "typename T::type".
1921	//
1922	// typename-specifier:
1923	// 'typename' '::' [opt] nested-name-specifier identifier
1924	// 'typename' '::' [opt] nested-name-specifier template [opt]
1925	// simple-template-id
1926	SourceLocation TypenameLoc = ConsumeToken();
1927	CXXScopeSpec SS;
1928	if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1929	/*ObjectHasErrors=*/false,
1930	/*EnteringContext=*/false, MayBePseudoDestructor: nullptr,
1931	/*IsTypename*/ true))
1932	return true;
1933	if (SS.isEmpty()) {
1934	if (Tok.is(K: tok::identifier) || Tok.is(K: tok::annot_template_id) ||
1935	Tok.is(K: tok::annot_decltype)) {
1936	// Attempt to recover by skipping the invalid 'typename'
1937	if (Tok.is(K: tok::annot_decltype) ||
1938	(!TryAnnotateTypeOrScopeToken(AllowImplicitTypename) &&
1939	Tok.isAnnotation())) {
1940	unsigned DiagID = diag::err_expected_qualified_after_typename;
1941	// MS compatibility: MSVC permits using known types with typename.
1942	// e.g. "typedef typename T* pointer_type"
1943	if (getLangOpts().MicrosoftExt)
1944	DiagID = diag::warn_expected_qualified_after_typename;
1945	Diag(Loc: Tok.getLocation(), DiagID);
1946	return false;
1947	}
1948	}
1949	if (Tok.isEditorPlaceholder())
1950	return true;
1951
1952	Diag(Loc: Tok.getLocation(), DiagID: diag::err_expected_qualified_after_typename);
1953	return true;
1954	}
1955
1956	bool TemplateKWPresent = false;
1957	if (Tok.is(K: tok::kw_template)) {
1958	ConsumeToken();
1959	TemplateKWPresent = true;
1960	}
1961
1962	TypeResult Ty;
1963	if (Tok.is(K: tok::identifier)) {
1964	if (TemplateKWPresent && NextToken().isNot(K: tok::less)) {
1965	Diag(Loc: Tok.getLocation(),
1966	DiagID: diag::missing_template_arg_list_after_template_kw);
1967	return true;
1968	}
1969	Ty = Actions.ActOnTypenameType(S: getCurScope(), TypenameLoc, SS,
1970	II: *Tok.getIdentifierInfo(),
1971	IdLoc: Tok.getLocation());
1972	} else if (Tok.is(K: tok::annot_template_id)) {
1973	TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
1974	if (!TemplateId->mightBeType()) {
1975	Diag(Tok, DiagID: diag::err_typename_refers_to_non_type_template)
1976	<< Tok.getAnnotationRange();
1977	return true;
1978	}
1979
1980	ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1981	TemplateId->NumArgs);
1982
1983	Ty = TemplateId->isInvalid()
1984	? TypeError()
1985	: Actions.ActOnTypenameType(
1986	S: getCurScope(), TypenameLoc, SS, TemplateLoc: TemplateId->TemplateKWLoc,
1987	TemplateName: TemplateId->Template, TemplateII: TemplateId->Name,
1988	TemplateIILoc: TemplateId->TemplateNameLoc, LAngleLoc: TemplateId->LAngleLoc,
1989	TemplateArgs: TemplateArgsPtr, RAngleLoc: TemplateId->RAngleLoc);
1990	} else {
1991	Diag(Tok, DiagID: diag::err_expected_type_name_after_typename)
1992	<< SS.getRange();
1993	return true;
1994	}
1995
1996	SourceLocation EndLoc = Tok.getLastLoc();
1997	Tok.setKind(tok::annot_typename);
1998	setTypeAnnotation(Tok, T: Ty);
1999	Tok.setAnnotationEndLoc(EndLoc);
2000	Tok.setLocation(TypenameLoc);
2001	PP.AnnotateCachedTokens(Tok);
2002	return false;
2003	}
2004
2005	// Remembers whether the token was originally a scope annotation.
2006	bool WasScopeAnnotation = Tok.is(K: tok::annot_cxxscope);
2007
2008	CXXScopeSpec SS;
2009	if (getLangOpts().CPlusPlus)
2010	if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
2011	/*ObjectHasErrors=*/false,
2012	/*EnteringContext*/ false))
2013	return true;
2014
2015	return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, IsNewScope: !WasScopeAnnotation,
2016	AllowImplicitTypename);
2017	}
2018
2019	bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(
2020	CXXScopeSpec &SS, bool IsNewScope,
2021	ImplicitTypenameContext AllowImplicitTypename) {
2022	if (Tok.is(K: tok::identifier)) {
2023	// Determine whether the identifier is a type name.
2024	if (ParsedType Ty = Actions.getTypeName(
2025	II: *Tok.getIdentifierInfo(), NameLoc: Tok.getLocation(), S: getCurScope(), SS: &SS,
2026	isClassName: false, HasTrailingDot: NextToken().is(K: tok::period), ObjectType: nullptr,
2027	/*IsCtorOrDtorName=*/false,
2028	/*NonTrivialTypeSourceInfo=*/WantNontrivialTypeSourceInfo: true,
2029	/*IsClassTemplateDeductionContext=*/true, AllowImplicitTypename)) {
2030	SourceLocation BeginLoc = Tok.getLocation();
2031	if (SS.isNotEmpty()) // it was a C++ qualified type name.
2032	BeginLoc = SS.getBeginLoc();
2033
2034	/// An Objective-C object type followed by '<' is a specialization of
2035	/// a parameterized class type or a protocol-qualified type.
2036	if (getLangOpts().ObjC && NextToken().is(K: tok::less) &&
2037	(Ty.get()->isObjCObjectType() ||
2038	Ty.get()->isObjCObjectPointerType())) {
2039	// Consume the name.
2040	SourceLocation IdentifierLoc = ConsumeToken();
2041	SourceLocation NewEndLoc;
2042	TypeResult NewType
2043	= parseObjCTypeArgsAndProtocolQualifiers(loc: IdentifierLoc, type: Ty,
2044	/*consumeLastToken=*/false,
2045	endLoc&: NewEndLoc);
2046	if (NewType.isUsable())
2047	Ty = NewType.get();
2048	else if (Tok.is(K: tok::eof)) // Nothing to do here, bail out...
2049	return false;
2050	}
2051
2052	// This is a typename. Replace the current token in-place with an
2053	// annotation type token.
2054	Tok.setKind(tok::annot_typename);
2055	setTypeAnnotation(Tok, T: Ty);
2056	Tok.setAnnotationEndLoc(Tok.getLocation());
2057	Tok.setLocation(BeginLoc);
2058
2059	// In case the tokens were cached, have Preprocessor replace
2060	// them with the annotation token.
2061	PP.AnnotateCachedTokens(Tok);
2062	return false;
2063	}
2064
2065	if (!getLangOpts().CPlusPlus) {
2066	// If we're in C, the only place we can have :: tokens is C23
2067	// attribute which is parsed elsewhere. If the identifier is not a type,
2068	// then it can't be scope either, just early exit.
2069	return false;
2070	}
2071
2072	// If this is a template-id, annotate with a template-id or type token.
2073	// FIXME: This appears to be dead code. We already have formed template-id
2074	// tokens when parsing the scope specifier; this can never form a new one.
2075	if (NextToken().is(K: tok::less)) {
2076	TemplateTy Template;
2077	UnqualifiedId TemplateName;
2078	TemplateName.setIdentifier(Id: Tok.getIdentifierInfo(), IdLoc: Tok.getLocation());
2079	bool MemberOfUnknownSpecialization;
2080	if (TemplateNameKind TNK = Actions.isTemplateName(
2081	S: getCurScope(), SS,
2082	/*hasTemplateKeyword=*/false, Name: TemplateName,
2083	/*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
2084	MemberOfUnknownSpecialization)) {
2085	// Only annotate an undeclared template name as a template-id if the
2086	// following tokens have the form of a template argument list.
2087	if (TNK != TNK_Undeclared_template ||
2088	isTemplateArgumentList(TokensToSkip: 1) != TPResult::False) {
2089	// Consume the identifier.
2090	ConsumeToken();
2091	if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateKWLoc: SourceLocation(),
2092	TemplateName)) {
2093	// If an unrecoverable error occurred, we need to return true here,
2094	// because the token stream is in a damaged state. We may not
2095	// return a valid identifier.
2096	return true;
2097	}
2098	}
2099	}
2100	}
2101
2102	// The current token, which is either an identifier or a
2103	// template-id, is not part of the annotation. Fall through to
2104	// push that token back into the stream and complete the C++ scope
2105	// specifier annotation.
2106	}
2107
2108	if (Tok.is(K: tok::annot_template_id)) {
2109	TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(tok: Tok);
2110	if (TemplateId->Kind == TNK_Type_template) {
2111	// A template-id that refers to a type was parsed into a
2112	// template-id annotation in a context where we weren't allowed
2113	// to produce a type annotation token. Update the template-id
2114	// annotation token to a type annotation token now.
2115	AnnotateTemplateIdTokenAsType(SS, AllowImplicitTypename);
2116	return false;
2117	}
2118	}
2119
2120	if (SS.isEmpty()) {
2121	if (getLangOpts().ObjC && !getLangOpts().CPlusPlus &&
2122	Tok.is(K: tok::coloncolon)) {
2123	// ObjectiveC does not allow :: as as a scope token.
2124	Diag(Loc: ConsumeToken(), DiagID: diag::err_expected_type);
2125	return true;
2126	}
2127	return false;
2128	}
2129
2130	// A C++ scope specifier that isn't followed by a typename.
2131	AnnotateScopeToken(SS, IsNewAnnotation: IsNewScope);
2132	return false;
2133	}
2134
2135	bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
2136	assert(getLangOpts().CPlusPlus &&
2137	"Call sites of this function should be guarded by checking for C++");
2138	assert(MightBeCXXScopeToken() && "Cannot be a type or scope token!");
2139
2140	CXXScopeSpec SS;
2141	if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
2142	/*ObjectHasErrors=*/false,
2143	EnteringContext))
2144	return true;
2145	if (SS.isEmpty())
2146	return false;
2147
2148	AnnotateScopeToken(SS, IsNewAnnotation: true);
2149	return false;
2150	}
2151
2152	bool Parser::isTokenEqualOrEqualTypo() {
2153	tok::TokenKind Kind = Tok.getKind();
2154	switch (Kind) {
2155	default:
2156	return false;
2157	case tok::ampequal: // &=
2158	case tok::starequal: // *=
2159	case tok::plusequal: // +=
2160	case tok::minusequal: // -=
2161	case tok::exclaimequal: // !=
2162	case tok::slashequal: // /=
2163	case tok::percentequal: // %=
2164	case tok::lessequal: // <=
2165	case tok::lesslessequal: // <<=
2166	case tok::greaterequal: // >=
2167	case tok::greatergreaterequal: // >>=
2168	case tok::caretequal: // ^=
2169	case tok::pipeequal: // |=
2170	case tok::equalequal: // ==
2171	Diag(Tok, DiagID: diag::err_invalid_token_after_declarator_suggest_equal)
2172	<< Kind
2173	<< FixItHint::CreateReplacement(RemoveRange: SourceRange(Tok.getLocation()), Code: "=");
2174	[[fallthrough]];
2175	case tok::equal:
2176	return true;
2177	}
2178	}
2179
2180	SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
2181	assert(Tok.is(tok::code_completion));
2182	PrevTokLocation = Tok.getLocation();
2183
2184	for (Scope *S = getCurScope(); S; S = S->getParent()) {
2185	if (S->isFunctionScope()) {
2186	cutOffParsing();
2187	Actions.CodeCompletion().CodeCompleteOrdinaryName(
2188	S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_RecoveryInFunction);
2189	return PrevTokLocation;
2190	}
2191
2192	if (S->isClassScope()) {
2193	cutOffParsing();
2194	Actions.CodeCompletion().CodeCompleteOrdinaryName(
2195	S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_Class);
2196	return PrevTokLocation;
2197	}
2198	}
2199
2200	cutOffParsing();
2201	Actions.CodeCompletion().CodeCompleteOrdinaryName(
2202	S: getCurScope(), CompletionContext: SemaCodeCompletion::PCC_Namespace);
2203	return PrevTokLocation;
2204	}
2205
2206	// Code-completion pass-through functions
2207
2208	void Parser::CodeCompleteDirective(bool InConditional) {
2209	Actions.CodeCompletion().CodeCompletePreprocessorDirective(InConditional);
2210	}
2211
2212	void Parser::CodeCompleteInConditionalExclusion() {
2213	Actions.CodeCompletion().CodeCompleteInPreprocessorConditionalExclusion(
2214	S: getCurScope());
2215	}
2216
2217	void Parser::CodeCompleteMacroName(bool IsDefinition) {
2218	Actions.CodeCompletion().CodeCompletePreprocessorMacroName(IsDefinition);
2219	}
2220
2221	void Parser::CodeCompletePreprocessorExpression() {
2222	Actions.CodeCompletion().CodeCompletePreprocessorExpression();
2223	}
2224
2225	void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
2226	MacroInfo *MacroInfo,
2227	unsigned ArgumentIndex) {
2228	Actions.CodeCompletion().CodeCompletePreprocessorMacroArgument(
2229	S: getCurScope(), Macro, MacroInfo, Argument: ArgumentIndex);
2230	}
2231
2232	void Parser::CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {
2233	Actions.CodeCompletion().CodeCompleteIncludedFile(Dir, IsAngled);
2234	}
2235
2236	void Parser::CodeCompleteNaturalLanguage() {
2237	Actions.CodeCompletion().CodeCompleteNaturalLanguage();
2238	}
2239
2240	bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
2241	assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
2242	"Expected '__if_exists' or '__if_not_exists'");
2243	Result.IsIfExists = Tok.is(K: tok::kw___if_exists);
2244	Result.KeywordLoc = ConsumeToken();
2245
2246	BalancedDelimiterTracker T(*this, tok::l_paren);
2247	if (T.consumeOpen()) {
2248	Diag(Tok, DiagID: diag::err_expected_lparen_after)
2249	<< (Result.IsIfExists? "__if_exists" : "__if_not_exists");
2250	return true;
2251	}
2252
2253	// Parse nested-name-specifier.
2254	if (getLangOpts().CPlusPlus)
2255	ParseOptionalCXXScopeSpecifier(SS&: Result.SS, /*ObjectType=*/nullptr,
2256	/*ObjectHasErrors=*/false,
2257	/*EnteringContext=*/false);
2258
2259	// Check nested-name specifier.
2260	if (Result.SS.isInvalid()) {
2261	T.skipToEnd();
2262	return true;
2263	}
2264
2265	// Parse the unqualified-id.
2266	SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
2267	if (ParseUnqualifiedId(SS&: Result.SS, /*ObjectType=*/nullptr,
2268	/*ObjectHadErrors=*/false, /*EnteringContext*/ false,
2269	/*AllowDestructorName*/ true,
2270	/*AllowConstructorName*/ true,
2271	/*AllowDeductionGuide*/ false, TemplateKWLoc: &TemplateKWLoc,
2272	Result&: Result.Name)) {
2273	T.skipToEnd();
2274	return true;
2275	}
2276
2277	if (T.consumeClose())
2278	return true;
2279
2280	// Check if the symbol exists.
2281	switch (Actions.CheckMicrosoftIfExistsSymbol(S: getCurScope(), KeywordLoc: Result.KeywordLoc,
2282	IsIfExists: Result.IsIfExists, SS&: Result.SS,
2283	Name&: Result.Name)) {
2284	case IfExistsResult::Exists:
2285	Result.Behavior =
2286	Result.IsIfExists ? IfExistsBehavior::Parse : IfExistsBehavior::Skip;
2287	break;
2288
2289	case IfExistsResult::DoesNotExist:
2290	Result.Behavior =
2291	!Result.IsIfExists ? IfExistsBehavior::Parse : IfExistsBehavior::Skip;
2292	break;
2293
2294	case IfExistsResult::Dependent:
2295	Result.Behavior = IfExistsBehavior::Dependent;
2296	break;
2297
2298	case IfExistsResult::Error:
2299	return true;
2300	}
2301
2302	return false;
2303	}
2304
2305	void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2306	IfExistsCondition Result;
2307	if (ParseMicrosoftIfExistsCondition(Result))
2308	return;
2309
2310	BalancedDelimiterTracker Braces(*this, tok::l_brace);
2311	if (Braces.consumeOpen()) {
2312	Diag(Tok, DiagID: diag::err_expected) << tok::l_brace;
2313	return;
2314	}
2315
2316	switch (Result.Behavior) {
2317	case IfExistsBehavior::Parse:
2318	// Parse declarations below.
2319	break;
2320
2321	case IfExistsBehavior::Dependent:
2322	llvm_unreachable("Cannot have a dependent external declaration");
2323
2324	case IfExistsBehavior::Skip:
2325	Braces.skipToEnd();
2326	return;
2327	}
2328
2329	// Parse the declarations.
2330	// FIXME: Support module import within __if_exists?
2331	while (Tok.isNot(K: tok::r_brace) && !isEofOrEom()) {
2332	ParsedAttributes Attrs(AttrFactory);
2333	MaybeParseCXX11Attributes(Attrs);
2334	ParsedAttributes EmptyDeclSpecAttrs(AttrFactory);
2335	DeclGroupPtrTy Result = ParseExternalDeclaration(Attrs, DeclSpecAttrs&: EmptyDeclSpecAttrs);
2336	if (Result && !getCurScope()->getParent())
2337	Actions.getASTConsumer().HandleTopLevelDecl(D: Result.get());
2338	}
2339	Braces.consumeClose();
2340	}
2341
2342	Parser::DeclGroupPtrTy
2343	Parser::ParseModuleDecl(Sema::ModuleImportState &ImportState) {
2344	Token Introducer = Tok;
2345	SourceLocation StartLoc = Introducer.getLocation();
2346
2347	Sema::ModuleDeclKind MDK = TryConsumeToken(Expected: tok::kw_export)
2348	? Sema::ModuleDeclKind::Interface
2349	: Sema::ModuleDeclKind::Implementation;
2350
2351	assert(
2352	(Tok.is(tok::kw_module) ||
2353	(Tok.is(tok::identifier) && Tok.getIdentifierInfo() == Ident_module)) &&
2354	"not a module declaration");
2355	SourceLocation ModuleLoc = ConsumeToken();
2356
2357	// Attributes appear after the module name, not before.
2358	// FIXME: Suggest moving the attributes later with a fixit.
2359	DiagnoseAndSkipCXX11Attributes();
2360
2361	// Parse a global-module-fragment, if present.
2362	if (getLangOpts().CPlusPlusModules && Tok.is(K: tok::semi)) {
2363	SourceLocation SemiLoc = ConsumeToken();
2364	if (ImportState != Sema::ModuleImportState::FirstDecl ||
2365	Introducer.hasSeenNoTrivialPPDirective()) {
2366	Diag(Loc: StartLoc, DiagID: diag::err_global_module_introducer_not_at_start)
2367	<< SourceRange(StartLoc, SemiLoc);
2368	return nullptr;
2369	}
2370	if (MDK == Sema::ModuleDeclKind::Interface) {
2371	Diag(Loc: StartLoc, DiagID: diag::err_module_fragment_exported)
2372	<< /*global*/0 << FixItHint::CreateRemoval(RemoveRange: StartLoc);
2373	}
2374	ImportState = Sema::ModuleImportState::GlobalFragment;
2375	return Actions.ActOnGlobalModuleFragmentDecl(ModuleLoc);
2376	}
2377
2378	// Parse a private-module-fragment, if present.
2379	if (getLangOpts().CPlusPlusModules && Tok.is(K: tok::colon) &&
2380	NextToken().is(K: tok::kw_private)) {
2381	if (MDK == Sema::ModuleDeclKind::Interface) {
2382	Diag(Loc: StartLoc, DiagID: diag::err_module_fragment_exported)
2383	<< /*private*/1 << FixItHint::CreateRemoval(RemoveRange: StartLoc);
2384	}
2385	ConsumeToken();
2386	SourceLocation PrivateLoc = ConsumeToken();
2387	DiagnoseAndSkipCXX11Attributes();
2388	ExpectAndConsumeSemi(DiagID: diag::err_private_module_fragment_expected_semi);
2389	ImportState = ImportState == Sema::ModuleImportState::ImportAllowed
2390	? Sema::ModuleImportState::PrivateFragmentImportAllowed
2391	: Sema::ModuleImportState::PrivateFragmentImportFinished;
2392	return Actions.ActOnPrivateModuleFragmentDecl(ModuleLoc, PrivateLoc);
2393	}
2394
2395	SmallVector<IdentifierLoc, 2> Path;
2396	if (ParseModuleName(UseLoc: ModuleLoc, Path, /*IsImport*/ false))
2397	return nullptr;
2398
2399	// Parse the optional module-partition.
2400	SmallVector<IdentifierLoc, 2> Partition;
2401	if (Tok.is(K: tok::colon)) {
2402	SourceLocation ColonLoc = ConsumeToken();
2403	if (!getLangOpts().CPlusPlusModules)
2404	Diag(Loc: ColonLoc, DiagID: diag::err_unsupported_module_partition)
2405	<< SourceRange(ColonLoc, Partition.back().getLoc());
2406	// Recover by ignoring the partition name.
2407	else if (ParseModuleName(UseLoc: ModuleLoc, Path&: Partition, /*IsImport*/ false))
2408	return nullptr;
2409	}
2410
2411	// We don't support any module attributes yet; just parse them and diagnose.
2412	ParsedAttributes Attrs(AttrFactory);
2413	MaybeParseCXX11Attributes(Attrs);
2414	ProhibitCXX11Attributes(Attrs, AttrDiagID: diag::err_attribute_not_module_attr,
2415	KeywordDiagId: diag::err_keyword_not_module_attr,
2416	/*DiagnoseEmptyAttrs=*/false,
2417	/*WarnOnUnknownAttrs=*/true);
2418
2419	ExpectAndConsumeSemi(DiagID: diag::err_module_expected_semi);
2420
2421	return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path, Partition,
2422	ImportState,
2423	SeenNoTrivialPPDirective: Introducer.hasSeenNoTrivialPPDirective());
2424	}
2425
2426	Decl *Parser::ParseModuleImport(SourceLocation AtLoc,
2427	Sema::ModuleImportState &ImportState) {
2428	SourceLocation StartLoc = AtLoc.isInvalid() ? Tok.getLocation() : AtLoc;
2429
2430	SourceLocation ExportLoc;
2431	TryConsumeToken(Expected: tok::kw_export, Loc&: ExportLoc);
2432
2433	assert((AtLoc.isInvalid() ? Tok.isOneOf(tok::kw_import, tok::identifier)
2434	: Tok.isObjCAtKeyword(tok::objc_import)) &&
2435	"Improper start to module import");
2436	bool IsObjCAtImport = Tok.isObjCAtKeyword(objcKey: tok::objc_import);
2437	SourceLocation ImportLoc = ConsumeToken();
2438
2439	// For C++20 modules, we can have "name" or ":Partition name" as valid input.
2440	SmallVector<IdentifierLoc, 2> Path;
2441	bool IsPartition = false;
2442	Module *HeaderUnit = nullptr;
2443	if (Tok.is(K: tok::header_name)) {
2444	// This is a header import that the preprocessor decided we should skip
2445	// because it was malformed in some way. Parse and ignore it; it's already
2446	// been diagnosed.
2447	ConsumeToken();
2448	} else if (Tok.is(K: tok::annot_header_unit)) {
2449	// This is a header import that the preprocessor mapped to a module import.
2450	HeaderUnit = reinterpret_cast<Module *>(Tok.getAnnotationValue());
2451	ConsumeAnnotationToken();
2452	} else if (Tok.is(K: tok::colon)) {
2453	SourceLocation ColonLoc = ConsumeToken();
2454	if (!getLangOpts().CPlusPlusModules)
2455	Diag(Loc: ColonLoc, DiagID: diag::err_unsupported_module_partition)
2456	<< SourceRange(ColonLoc, Path.back().getLoc());
2457	// Recover by leaving partition empty.
2458	else if (ParseModuleName(UseLoc: ColonLoc, Path, /*IsImport*/ true))
2459	return nullptr;
2460	else
2461	IsPartition = true;
2462	} else {
2463	if (ParseModuleName(UseLoc: ImportLoc, Path, /*IsImport*/ true))
2464	return nullptr;
2465	}
2466
2467	ParsedAttributes Attrs(AttrFactory);
2468	MaybeParseCXX11Attributes(Attrs);
2469	// We don't support any module import attributes yet.
2470	ProhibitCXX11Attributes(Attrs, AttrDiagID: diag::err_attribute_not_import_attr,
2471	KeywordDiagId: diag::err_keyword_not_import_attr,
2472	/*DiagnoseEmptyAttrs=*/false,
2473	/*WarnOnUnknownAttrs=*/true);
2474
2475	if (PP.hadModuleLoaderFatalFailure()) {
2476	// With a fatal failure in the module loader, we abort parsing.
2477	cutOffParsing();
2478	return nullptr;
2479	}
2480
2481	// Diagnose mis-imports.
2482	bool SeenError = true;
2483	switch (ImportState) {
2484	case Sema::ModuleImportState::ImportAllowed:
2485	SeenError = false;
2486	break;
2487	case Sema::ModuleImportState::FirstDecl:
2488	// If we found an import decl as the first declaration, we must be not in
2489	// a C++20 module unit or we are in an invalid state.
2490	ImportState = Sema::ModuleImportState::NotACXX20Module;
2491	[[fallthrough]];
2492	case Sema::ModuleImportState::NotACXX20Module:
2493	// We can only import a partition within a module purview.
2494	if (IsPartition)
2495	Diag(Loc: ImportLoc, DiagID: diag::err_partition_import_outside_module);
2496	else
2497	SeenError = false;
2498	break;
2499	case Sema::ModuleImportState::GlobalFragment:
2500	case Sema::ModuleImportState::PrivateFragmentImportAllowed:
2501	// We can only have pre-processor directives in the global module fragment
2502	// which allows pp-import, but not of a partition (since the global module
2503	// does not have partitions).
2504	// We cannot import a partition into a private module fragment, since
2505	// [module.private.frag]/1 disallows private module fragments in a multi-
2506	// TU module.
2507	if (IsPartition || (HeaderUnit && HeaderUnit->Kind !=
2508	Module::ModuleKind::ModuleHeaderUnit))
2509	Diag(Loc: ImportLoc, DiagID: diag::err_import_in_wrong_fragment)
2510	<< IsPartition
2511	<< (ImportState == Sema::ModuleImportState::GlobalFragment ? 0 : 1);
2512	else
2513	SeenError = false;
2514	break;
2515	case Sema::ModuleImportState::ImportFinished:
2516	case Sema::ModuleImportState::PrivateFragmentImportFinished:
2517	if (getLangOpts().CPlusPlusModules)
2518	Diag(Loc: ImportLoc, DiagID: diag::err_import_not_allowed_here);
2519	else
2520	SeenError = false;
2521	break;
2522	}
2523	ExpectAndConsumeSemi(DiagID: diag::err_module_expected_semi);
2524
2525	if (SeenError)
2526	return nullptr;
2527
2528	DeclResult Import;
2529	if (HeaderUnit)
2530	Import =
2531	Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, M: HeaderUnit);
2532	else if (!Path.empty())
2533	Import = Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, Path,
2534	IsPartition);
2535	if (Import.isInvalid())
2536	return nullptr;
2537
2538	// Using '@import' in framework headers requires modules to be enabled so that
2539	// the header is parseable. Emit a warning to make the user aware.
2540	if (IsObjCAtImport && AtLoc.isValid()) {
2541	auto &SrcMgr = PP.getSourceManager();
2542	auto FE = SrcMgr.getFileEntryRefForID(FID: SrcMgr.getFileID(SpellingLoc: AtLoc));
2543	if (FE && llvm::sys::path::parent_path(path: FE->getDir().getName())
2544	.ends_with(Suffix: ".framework"))
2545	Diags.Report(Loc: AtLoc, DiagID: diag::warn_atimport_in_framework_header);
2546	}
2547
2548	return Import.get();
2549	}
2550
2551	bool Parser::ParseModuleName(SourceLocation UseLoc,
2552	SmallVectorImpl<IdentifierLoc> &Path,
2553	bool IsImport) {
2554	// Parse the module path.
2555	while (true) {
2556	if (!Tok.is(K: tok::identifier)) {
2557	if (Tok.is(K: tok::code_completion)) {
2558	cutOffParsing();
2559	Actions.CodeCompletion().CodeCompleteModuleImport(ImportLoc: UseLoc, Path);
2560	return true;
2561	}
2562
2563	Diag(Tok, DiagID: diag::err_module_expected_ident) << IsImport;
2564	SkipUntil(T: tok::semi);
2565	return true;
2566	}
2567
2568	// Record this part of the module path.
2569	Path.emplace_back(Args: Tok.getLocation(), Args: Tok.getIdentifierInfo());
2570	ConsumeToken();
2571
2572	if (Tok.isNot(K: tok::period))
2573	return false;
2574
2575	ConsumeToken();
2576	}
2577	}
2578
2579	bool Parser::parseMisplacedModuleImport() {
2580	while (true) {
2581	switch (Tok.getKind()) {
2582	case tok::annot_module_end:
2583	// If we recovered from a misplaced module begin, we expect to hit a
2584	// misplaced module end too. Stay in the current context when this
2585	// happens.
2586	if (MisplacedModuleBeginCount) {
2587	--MisplacedModuleBeginCount;
2588	Actions.ActOnAnnotModuleEnd(
2589	DirectiveLoc: Tok.getLocation(),
2590	Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2591	ConsumeAnnotationToken();
2592	continue;
2593	}
2594	// Inform caller that recovery failed, the error must be handled at upper
2595	// level. This will generate the desired "missing '}' at end of module"
2596	// diagnostics on the way out.
2597	return true;
2598	case tok::annot_module_begin:
2599	// Recover by entering the module (Sema will diagnose).
2600	Actions.ActOnAnnotModuleBegin(
2601	DirectiveLoc: Tok.getLocation(),
2602	Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2603	ConsumeAnnotationToken();
2604	++MisplacedModuleBeginCount;
2605	continue;
2606	case tok::annot_module_include:
2607	// Module import found where it should not be, for instance, inside a
2608	// namespace. Recover by importing the module.
2609	Actions.ActOnAnnotModuleInclude(
2610	DirectiveLoc: Tok.getLocation(),
2611	Mod: reinterpret_cast<Module *>(Tok.getAnnotationValue()));
2612	ConsumeAnnotationToken();
2613	// If there is another module import, process it.
2614	continue;
2615	default:
2616	return false;
2617	}
2618	}
2619	return false;
2620	}
2621
2622	void Parser::diagnoseUseOfC11Keyword(const Token &Tok) {
2623	// Warn that this is a C11 extension if in an older mode or if in C++.
2624	// Otherwise, warn that it is incompatible with standards before C11 if in
2625	// C11 or later.
2626	Diag(Tok, DiagID: getLangOpts().C11 ? diag::warn_c11_compat_keyword
2627	: diag::ext_c11_feature)
2628	<< Tok.getName();
2629	}
2630
2631	bool BalancedDelimiterTracker::diagnoseOverflow() {
2632	P.Diag(Tok: P.Tok, DiagID: diag::err_bracket_depth_exceeded)
2633	<< P.getLangOpts().BracketDepth;
2634	P.Diag(Tok: P.Tok, DiagID: diag::note_bracket_depth);
2635	P.cutOffParsing();
2636	return true;
2637	}
2638
2639	bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2640	const char *Msg,
2641	tok::TokenKind SkipToTok) {
2642	LOpen = P.Tok.getLocation();
2643	if (P.ExpectAndConsume(ExpectedTok: Kind, DiagID, Msg)) {
2644	if (SkipToTok != tok::unknown)
2645	P.SkipUntil(T: SkipToTok, Flags: Parser::StopAtSemi);
2646	return true;
2647	}
2648
2649	if (getDepth() < P.getLangOpts().BracketDepth)
2650	return false;
2651
2652	return diagnoseOverflow();
2653	}
2654
2655	bool BalancedDelimiterTracker::diagnoseMissingClose() {
2656	assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2657
2658	if (P.Tok.is(K: tok::annot_module_end))
2659	P.Diag(Tok: P.Tok, DiagID: diag::err_missing_before_module_end) << Close;
2660	else
2661	P.Diag(Tok: P.Tok, DiagID: diag::err_expected) << Close;
2662	P.Diag(Loc: LOpen, DiagID: diag::note_matching) << Kind;
2663
2664	// If we're not already at some kind of closing bracket, skip to our closing
2665	// token.
2666	if (P.Tok.isNot(K: tok::r_paren) && P.Tok.isNot(K: tok::r_brace) &&
2667	P.Tok.isNot(K: tok::r_square) &&
2668	P.SkipUntil(T1: Close, T2: FinalToken,
2669	Flags: Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2670	P.Tok.is(K: Close))
2671	LClose = P.ConsumeAnyToken();
2672	return true;
2673	}
2674
2675	void BalancedDelimiterTracker::skipToEnd() {
2676	P.SkipUntil(T: Close, Flags: Parser::StopBeforeMatch);
2677	consumeClose();
2678	}
2679