clang  11.0.0git
Parser.cpp
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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/DeclTemplate.h"
20 #include "clang/Sema/DeclSpec.h"
22 #include "clang/Sema/Scope.h"
23 #include "llvm/Support/Path.h"
24 using namespace clang;
25 
26 
27 namespace {
28 /// A comment handler that passes comments found by the preprocessor
29 /// to the parser action.
30 class ActionCommentHandler : public CommentHandler {
31  Sema &S;
32 
33 public:
34  explicit ActionCommentHandler(Sema &S) : S(S) { }
35 
36  bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
37  S.ActOnComment(Comment);
38  return false;
39  }
40 };
41 } // end anonymous namespace
42 
43 IdentifierInfo *Parser::getSEHExceptKeyword() {
44  // __except is accepted as a (contextual) keyword
45  if (!Ident__except && (getLangOpts().MicrosoftExt || getLangOpts().Borland))
46  Ident__except = PP.getIdentifierInfo("__except");
47 
48  return Ident__except;
49 }
50 
51 Parser::Parser(Preprocessor &pp, Sema &actions, bool skipFunctionBodies)
52  : PP(pp), Actions(actions), Diags(PP.getDiagnostics()),
53  GreaterThanIsOperator(true), ColonIsSacred(false),
54  InMessageExpression(false), TemplateParameterDepth(0),
55  ParsingInObjCContainer(false) {
56  SkipFunctionBodies = pp.isCodeCompletionEnabled() || skipFunctionBodies;
57  Tok.startToken();
58  Tok.setKind(tok::eof);
59  Actions.CurScope = nullptr;
60  NumCachedScopes = 0;
61  CurParsedObjCImpl = nullptr;
62 
63  // Add #pragma handlers. These are removed and destroyed in the
64  // destructor.
65  initializePragmaHandlers();
66 
67  CommentSemaHandler.reset(new ActionCommentHandler(actions));
68  PP.addCommentHandler(CommentSemaHandler.get());
69 
70  PP.setCodeCompletionHandler(*this);
71 }
72 
74  return Diags.Report(Loc, DiagID);
75 }
76 
77 DiagnosticBuilder Parser::Diag(const Token &Tok, unsigned DiagID) {
78  return Diag(Tok.getLocation(), DiagID);
79 }
80 
81 /// Emits a diagnostic suggesting parentheses surrounding a
82 /// given range.
83 ///
84 /// \param Loc The location where we'll emit the diagnostic.
85 /// \param DK The kind of diagnostic to emit.
86 /// \param ParenRange Source range enclosing code that should be parenthesized.
87 void Parser::SuggestParentheses(SourceLocation Loc, unsigned DK,
88  SourceRange ParenRange) {
89  SourceLocation EndLoc = PP.getLocForEndOfToken(ParenRange.getEnd());
90  if (!ParenRange.getEnd().isFileID() || EndLoc.isInvalid()) {
91  // We can't display the parentheses, so just dig the
92  // warning/error and return.
93  Diag(Loc, DK);
94  return;
95  }
96 
97  Diag(Loc, DK)
98  << FixItHint::CreateInsertion(ParenRange.getBegin(), "(")
99  << FixItHint::CreateInsertion(EndLoc, ")");
100 }
101 
102 static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok) {
103  switch (ExpectedTok) {
104  case tok::semi:
105  return Tok.is(tok::colon) || Tok.is(tok::comma); // : or , for ;
106  default: return false;
107  }
108 }
109 
110 bool Parser::ExpectAndConsume(tok::TokenKind ExpectedTok, unsigned DiagID,
111  StringRef Msg) {
112  if (Tok.is(ExpectedTok) || Tok.is(tok::code_completion)) {
113  ConsumeAnyToken();
114  return false;
115  }
116 
117  // Detect common single-character typos and resume.
118  if (IsCommonTypo(ExpectedTok, Tok)) {
119  SourceLocation Loc = Tok.getLocation();
120  {
121  DiagnosticBuilder DB = Diag(Loc, DiagID);
123  SourceRange(Loc), tok::getPunctuatorSpelling(ExpectedTok));
124  if (DiagID == diag::err_expected)
125  DB << ExpectedTok;
126  else if (DiagID == diag::err_expected_after)
127  DB << Msg << ExpectedTok;
128  else
129  DB << Msg;
130  }
131 
132  // Pretend there wasn't a problem.
133  ConsumeAnyToken();
134  return false;
135  }
136 
137  SourceLocation EndLoc = PP.getLocForEndOfToken(PrevTokLocation);
138  const char *Spelling = nullptr;
139  if (EndLoc.isValid())
140  Spelling = tok::getPunctuatorSpelling(ExpectedTok);
141 
142  DiagnosticBuilder DB =
143  Spelling
144  ? Diag(EndLoc, DiagID) << FixItHint::CreateInsertion(EndLoc, Spelling)
145  : Diag(Tok, DiagID);
146  if (DiagID == diag::err_expected)
147  DB << ExpectedTok;
148  else if (DiagID == diag::err_expected_after)
149  DB << Msg << ExpectedTok;
150  else
151  DB << Msg;
152 
153  return true;
154 }
155 
156 bool Parser::ExpectAndConsumeSemi(unsigned DiagID) {
157  if (TryConsumeToken(tok::semi))
158  return false;
159 
160  if (Tok.is(tok::code_completion)) {
161  handleUnexpectedCodeCompletionToken();
162  return false;
163  }
164 
165  if ((Tok.is(tok::r_paren) || Tok.is(tok::r_square)) &&
166  NextToken().is(tok::semi)) {
167  Diag(Tok, diag::err_extraneous_token_before_semi)
168  << PP.getSpelling(Tok)
170  ConsumeAnyToken(); // The ')' or ']'.
171  ConsumeToken(); // The ';'.
172  return false;
173  }
174 
175  return ExpectAndConsume(tok::semi, DiagID);
176 }
177 
178 void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, DeclSpec::TST TST) {
179  if (!Tok.is(tok::semi)) return;
180 
181  bool HadMultipleSemis = false;
182  SourceLocation StartLoc = Tok.getLocation();
183  SourceLocation EndLoc = Tok.getLocation();
184  ConsumeToken();
185 
186  while ((Tok.is(tok::semi) && !Tok.isAtStartOfLine())) {
187  HadMultipleSemis = true;
188  EndLoc = Tok.getLocation();
189  ConsumeToken();
190  }
191 
192  // C++11 allows extra semicolons at namespace scope, but not in any of the
193  // other contexts.
194  if (Kind == OutsideFunction && getLangOpts().CPlusPlus) {
195  if (getLangOpts().CPlusPlus11)
196  Diag(StartLoc, diag::warn_cxx98_compat_top_level_semi)
197  << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
198  else
199  Diag(StartLoc, diag::ext_extra_semi_cxx11)
200  << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
201  return;
202  }
203 
204  if (Kind != AfterMemberFunctionDefinition || HadMultipleSemis)
205  Diag(StartLoc, diag::ext_extra_semi)
206  << Kind << DeclSpec::getSpecifierName(TST,
207  Actions.getASTContext().getPrintingPolicy())
208  << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
209  else
210  // A single semicolon is valid after a member function definition.
211  Diag(StartLoc, diag::warn_extra_semi_after_mem_fn_def)
212  << FixItHint::CreateRemoval(SourceRange(StartLoc, EndLoc));
213 }
214 
215 bool Parser::expectIdentifier() {
216  if (Tok.is(tok::identifier))
217  return false;
218  if (const auto *II = Tok.getIdentifierInfo()) {
219  if (II->isCPlusPlusKeyword(getLangOpts())) {
220  Diag(Tok, diag::err_expected_token_instead_of_objcxx_keyword)
221  << tok::identifier << Tok.getIdentifierInfo();
222  // Objective-C++: Recover by treating this keyword as a valid identifier.
223  return false;
224  }
225  }
226  Diag(Tok, diag::err_expected) << tok::identifier;
227  return true;
228 }
229 
230 //===----------------------------------------------------------------------===//
231 // Error recovery.
232 //===----------------------------------------------------------------------===//
233 
235  return (static_cast<unsigned>(L) & static_cast<unsigned>(R)) != 0;
236 }
237 
238 /// SkipUntil - Read tokens until we get to the specified token, then consume
239 /// it (unless no flag StopBeforeMatch). Because we cannot guarantee that the
240 /// token will ever occur, this skips to the next token, or to some likely
241 /// good stopping point. If StopAtSemi is true, skipping will stop at a ';'
242 /// character.
243 ///
244 /// If SkipUntil finds the specified token, it returns true, otherwise it
245 /// returns false.
247  // We always want this function to skip at least one token if the first token
248  // isn't T and if not at EOF.
249  bool isFirstTokenSkipped = true;
250  while (1) {
251  // If we found one of the tokens, stop and return true.
252  for (unsigned i = 0, NumToks = Toks.size(); i != NumToks; ++i) {
253  if (Tok.is(Toks[i])) {
254  if (HasFlagsSet(Flags, StopBeforeMatch)) {
255  // Noop, don't consume the token.
256  } else {
257  ConsumeAnyToken();
258  }
259  return true;
260  }
261  }
262 
263  // Important special case: The caller has given up and just wants us to
264  // skip the rest of the file. Do this without recursing, since we can
265  // get here precisely because the caller detected too much recursion.
266  if (Toks.size() == 1 && Toks[0] == tok::eof &&
267  !HasFlagsSet(Flags, StopAtSemi) &&
269  while (Tok.isNot(tok::eof))
270  ConsumeAnyToken();
271  return true;
272  }
273 
274  switch (Tok.getKind()) {
275  case tok::eof:
276  // Ran out of tokens.
277  return false;
278 
279  case tok::annot_pragma_openmp:
280  case tok::annot_pragma_openmp_end:
281  // Stop before an OpenMP pragma boundary.
282  if (OpenMPDirectiveParsing)
283  return false;
284  ConsumeAnnotationToken();
285  break;
286  case tok::annot_module_begin:
287  case tok::annot_module_end:
288  case tok::annot_module_include:
289  // Stop before we change submodules. They generally indicate a "good"
290  // place to pick up parsing again (except in the special case where
291  // we're trying to skip to EOF).
292  return false;
293 
294  case tok::code_completion:
295  if (!HasFlagsSet(Flags, StopAtCodeCompletion))
296  handleUnexpectedCodeCompletionToken();
297  return false;
298 
299  case tok::l_paren:
300  // Recursively skip properly-nested parens.
301  ConsumeParen();
302  if (HasFlagsSet(Flags, StopAtCodeCompletion))
303  SkipUntil(tok::r_paren, StopAtCodeCompletion);
304  else
305  SkipUntil(tok::r_paren);
306  break;
307  case tok::l_square:
308  // Recursively skip properly-nested square brackets.
309  ConsumeBracket();
310  if (HasFlagsSet(Flags, StopAtCodeCompletion))
311  SkipUntil(tok::r_square, StopAtCodeCompletion);
312  else
313  SkipUntil(tok::r_square);
314  break;
315  case tok::l_brace:
316  // Recursively skip properly-nested braces.
317  ConsumeBrace();
318  if (HasFlagsSet(Flags, StopAtCodeCompletion))
319  SkipUntil(tok::r_brace, StopAtCodeCompletion);
320  else
321  SkipUntil(tok::r_brace);
322  break;
323  case tok::question:
324  // Recursively skip ? ... : pairs; these function as brackets. But
325  // still stop at a semicolon if requested.
326  ConsumeToken();
327  SkipUntil(tok::colon,
328  SkipUntilFlags(unsigned(Flags) &
329  unsigned(StopAtCodeCompletion | StopAtSemi)));
330  break;
331 
332  // Okay, we found a ']' or '}' or ')', which we think should be balanced.
333  // Since the user wasn't looking for this token (if they were, it would
334  // already be handled), this isn't balanced. If there is a LHS token at a
335  // higher level, we will assume that this matches the unbalanced token
336  // and return it. Otherwise, this is a spurious RHS token, which we skip.
337  case tok::r_paren:
338  if (ParenCount && !isFirstTokenSkipped)
339  return false; // Matches something.
340  ConsumeParen();
341  break;
342  case tok::r_square:
343  if (BracketCount && !isFirstTokenSkipped)
344  return false; // Matches something.
345  ConsumeBracket();
346  break;
347  case tok::r_brace:
348  if (BraceCount && !isFirstTokenSkipped)
349  return false; // Matches something.
350  ConsumeBrace();
351  break;
352 
353  case tok::semi:
354  if (HasFlagsSet(Flags, StopAtSemi))
355  return false;
356  LLVM_FALLTHROUGH;
357  default:
358  // Skip this token.
359  ConsumeAnyToken();
360  break;
361  }
362  isFirstTokenSkipped = false;
363  }
364 }
365 
366 //===----------------------------------------------------------------------===//
367 // Scope manipulation
368 //===----------------------------------------------------------------------===//
369 
370 /// EnterScope - Start a new scope.
371 void Parser::EnterScope(unsigned ScopeFlags) {
372  if (NumCachedScopes) {
373  Scope *N = ScopeCache[--NumCachedScopes];
374  N->Init(getCurScope(), ScopeFlags);
375  Actions.CurScope = N;
376  } else {
377  Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
378  }
379 }
380 
381 /// ExitScope - Pop a scope off the scope stack.
383  assert(getCurScope() && "Scope imbalance!");
384 
385  // Inform the actions module that this scope is going away if there are any
386  // decls in it.
387  Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
388 
389  Scope *OldScope = getCurScope();
390  Actions.CurScope = OldScope->getParent();
391 
392  if (NumCachedScopes == ScopeCacheSize)
393  delete OldScope;
394  else
395  ScopeCache[NumCachedScopes++] = OldScope;
396 }
397 
398 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
399 /// this object does nothing.
400 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
401  bool ManageFlags)
402  : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
403  if (CurScope) {
404  OldFlags = CurScope->getFlags();
405  CurScope->setFlags(ScopeFlags);
406  }
407 }
408 
409 /// Restore the flags for the current scope to what they were before this
410 /// object overrode them.
411 Parser::ParseScopeFlags::~ParseScopeFlags() {
412  if (CurScope)
413  CurScope->setFlags(OldFlags);
414 }
415 
416 
417 //===----------------------------------------------------------------------===//
418 // C99 6.9: External Definitions.
419 //===----------------------------------------------------------------------===//
420 
422  // If we still have scopes active, delete the scope tree.
423  delete getCurScope();
424  Actions.CurScope = nullptr;
425 
426  // Free the scope cache.
427  for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
428  delete ScopeCache[i];
429 
430  resetPragmaHandlers();
431 
432  PP.removeCommentHandler(CommentSemaHandler.get());
433 
435 
436  DestroyTemplateIds();
437 }
438 
439 /// Initialize - Warm up the parser.
440 ///
442  // Create the translation unit scope. Install it as the current scope.
443  assert(getCurScope() == nullptr && "A scope is already active?");
446 
447  // Initialization for Objective-C context sensitive keywords recognition.
448  // Referenced in Parser::ParseObjCTypeQualifierList.
449  if (getLangOpts().ObjC) {
450  ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
451  ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
452  ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
453  ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
454  ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
455  ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
456  ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
457  ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
458  ObjCTypeQuals[objc_null_unspecified]
459  = &PP.getIdentifierTable().get("null_unspecified");
460  }
461 
462  Ident_instancetype = nullptr;
463  Ident_final = nullptr;
464  Ident_sealed = nullptr;
465  Ident_override = nullptr;
466  Ident_GNU_final = nullptr;
467  Ident_import = nullptr;
468  Ident_module = nullptr;
469 
470  Ident_super = &PP.getIdentifierTable().get("super");
471 
472  Ident_vector = nullptr;
473  Ident_bool = nullptr;
474  Ident_pixel = nullptr;
475  if (getLangOpts().AltiVec || getLangOpts().ZVector) {
476  Ident_vector = &PP.getIdentifierTable().get("vector");
477  Ident_bool = &PP.getIdentifierTable().get("bool");
478  }
479  if (getLangOpts().AltiVec)
480  Ident_pixel = &PP.getIdentifierTable().get("pixel");
481 
482  Ident_introduced = nullptr;
483  Ident_deprecated = nullptr;
484  Ident_obsoleted = nullptr;
485  Ident_unavailable = nullptr;
486  Ident_strict = nullptr;
487  Ident_replacement = nullptr;
488 
489  Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
490 
491  Ident__except = nullptr;
492 
493  Ident__exception_code = Ident__exception_info = nullptr;
494  Ident__abnormal_termination = Ident___exception_code = nullptr;
495  Ident___exception_info = Ident___abnormal_termination = nullptr;
496  Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
497  Ident_AbnormalTermination = nullptr;
498 
499  if(getLangOpts().Borland) {
500  Ident__exception_info = PP.getIdentifierInfo("_exception_info");
501  Ident___exception_info = PP.getIdentifierInfo("__exception_info");
502  Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
503  Ident__exception_code = PP.getIdentifierInfo("_exception_code");
504  Ident___exception_code = PP.getIdentifierInfo("__exception_code");
505  Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
506  Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
507  Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
508  Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
509 
510  PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
511  PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
512  PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
513  PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
514  PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
515  PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
516  PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
517  PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
518  PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
519  }
520 
521  if (getLangOpts().CPlusPlusModules) {
522  Ident_import = PP.getIdentifierInfo("import");
523  Ident_module = PP.getIdentifierInfo("module");
524  }
525 
526  Actions.Initialize();
527 
528  // Prime the lexer look-ahead.
529  ConsumeToken();
530 }
531 
532 void Parser::DestroyTemplateIds() {
533  for (TemplateIdAnnotation *Id : TemplateIds)
534  Id->Destroy();
535  TemplateIds.clear();
536 }
537 
538 /// Parse the first top-level declaration in a translation unit.
539 ///
540 /// translation-unit:
541 /// [C] external-declaration
542 /// [C] translation-unit external-declaration
543 /// [C++] top-level-declaration-seq[opt]
544 /// [C++20] global-module-fragment[opt] module-declaration
545 /// top-level-declaration-seq[opt] private-module-fragment[opt]
546 ///
547 /// Note that in C, it is an error if there is no first declaration.
549  Actions.ActOnStartOfTranslationUnit();
550 
551  // C11 6.9p1 says translation units must have at least one top-level
552  // declaration. C++ doesn't have this restriction. We also don't want to
553  // complain if we have a precompiled header, although technically if the PCH
554  // is empty we should still emit the (pedantic) diagnostic.
555  bool NoTopLevelDecls = ParseTopLevelDecl(Result, true);
556  if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
557  !getLangOpts().CPlusPlus)
558  Diag(diag::ext_empty_translation_unit);
559 
560  return NoTopLevelDecls;
561 }
562 
563 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
564 /// action tells us to. This returns true if the EOF was encountered.
565 ///
566 /// top-level-declaration:
567 /// declaration
568 /// [C++20] module-import-declaration
570  DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
571 
572  // Skip over the EOF token, flagging end of previous input for incremental
573  // processing
574  if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
575  ConsumeToken();
576 
577  Result = nullptr;
578  switch (Tok.getKind()) {
579  case tok::annot_pragma_unused:
580  HandlePragmaUnused();
581  return false;
582 
583  case tok::kw_export:
584  switch (NextToken().getKind()) {
585  case tok::kw_module:
586  goto module_decl;
587 
588  // Note: no need to handle kw_import here. We only form kw_import under
589  // the Modules TS, and in that case 'export import' is parsed as an
590  // export-declaration containing an import-declaration.
591 
592  // Recognize context-sensitive C++20 'export module' and 'export import'
593  // declarations.
594  case tok::identifier: {
596  if ((II == Ident_module || II == Ident_import) &&
597  GetLookAheadToken(2).isNot(tok::coloncolon)) {
598  if (II == Ident_module)
599  goto module_decl;
600  else
601  goto import_decl;
602  }
603  break;
604  }
605 
606  default:
607  break;
608  }
609  break;
610 
611  case tok::kw_module:
612  module_decl:
613  Result = ParseModuleDecl(IsFirstDecl);
614  return false;
615 
616  // tok::kw_import is handled by ParseExternalDeclaration. (Under the Modules
617  // TS, an import can occur within an export block.)
618  import_decl: {
619  Decl *ImportDecl = ParseModuleImport(SourceLocation());
620  Result = Actions.ConvertDeclToDeclGroup(ImportDecl);
621  return false;
622  }
623 
624  case tok::annot_module_include:
625  Actions.ActOnModuleInclude(Tok.getLocation(),
626  reinterpret_cast<Module *>(
627  Tok.getAnnotationValue()));
628  ConsumeAnnotationToken();
629  return false;
630 
631  case tok::annot_module_begin:
632  Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
633  Tok.getAnnotationValue()));
634  ConsumeAnnotationToken();
635  return false;
636 
637  case tok::annot_module_end:
638  Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
639  Tok.getAnnotationValue()));
640  ConsumeAnnotationToken();
641  return false;
642 
643  case tok::eof:
644  // Check whether -fmax-tokens= was reached.
645  if (PP.getMaxTokens() != 0 && PP.getTokenCount() > PP.getMaxTokens()) {
646  PP.Diag(Tok.getLocation(), diag::warn_max_tokens_total)
647  << PP.getTokenCount() << PP.getMaxTokens();
648  SourceLocation OverrideLoc = PP.getMaxTokensOverrideLoc();
649  if (OverrideLoc.isValid()) {
650  PP.Diag(OverrideLoc, diag::note_max_tokens_total_override);
651  }
652  }
653 
654  // Late template parsing can begin.
655  Actions.SetLateTemplateParser(LateTemplateParserCallback, nullptr, this);
657  Actions.ActOnEndOfTranslationUnit();
658  //else don't tell Sema that we ended parsing: more input might come.
659  return true;
660 
661  case tok::identifier:
662  // C++2a [basic.link]p3:
663  // A token sequence beginning with 'export[opt] module' or
664  // 'export[opt] import' and not immediately followed by '::'
665  // is never interpreted as the declaration of a top-level-declaration.
666  if ((Tok.getIdentifierInfo() == Ident_module ||
667  Tok.getIdentifierInfo() == Ident_import) &&
668  NextToken().isNot(tok::coloncolon)) {
669  if (Tok.getIdentifierInfo() == Ident_module)
670  goto module_decl;
671  else
672  goto import_decl;
673  }
674  break;
675 
676  default:
677  break;
678  }
679 
680  ParsedAttributesWithRange attrs(AttrFactory);
681  MaybeParseCXX11Attributes(attrs);
682 
683  Result = ParseExternalDeclaration(attrs);
684  return false;
685 }
686 
687 /// ParseExternalDeclaration:
688 ///
689 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
690 /// function-definition
691 /// declaration
692 /// [GNU] asm-definition
693 /// [GNU] __extension__ external-declaration
694 /// [OBJC] objc-class-definition
695 /// [OBJC] objc-class-declaration
696 /// [OBJC] objc-alias-declaration
697 /// [OBJC] objc-protocol-definition
698 /// [OBJC] objc-method-definition
699 /// [OBJC] @end
700 /// [C++] linkage-specification
701 /// [GNU] asm-definition:
702 /// simple-asm-expr ';'
703 /// [C++11] empty-declaration
704 /// [C++11] attribute-declaration
705 ///
706 /// [C++11] empty-declaration:
707 /// ';'
708 ///
709 /// [C++0x/GNU] 'extern' 'template' declaration
710 ///
711 /// [Modules-TS] module-import-declaration
712 ///
714 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
715  ParsingDeclSpec *DS) {
716  DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(*this);
717  ParenBraceBracketBalancer BalancerRAIIObj(*this);
718 
719  if (PP.isCodeCompletionReached()) {
720  cutOffParsing();
721  return nullptr;
722  }
723 
724  Decl *SingleDecl = nullptr;
725  switch (Tok.getKind()) {
726  case tok::annot_pragma_vis:
727  HandlePragmaVisibility();
728  return nullptr;
729  case tok::annot_pragma_pack:
730  HandlePragmaPack();
731  return nullptr;
732  case tok::annot_pragma_msstruct:
733  HandlePragmaMSStruct();
734  return nullptr;
735  case tok::annot_pragma_align:
736  HandlePragmaAlign();
737  return nullptr;
738  case tok::annot_pragma_weak:
739  HandlePragmaWeak();
740  return nullptr;
741  case tok::annot_pragma_weakalias:
742  HandlePragmaWeakAlias();
743  return nullptr;
744  case tok::annot_pragma_redefine_extname:
745  HandlePragmaRedefineExtname();
746  return nullptr;
747  case tok::annot_pragma_fp_contract:
748  HandlePragmaFPContract();
749  return nullptr;
750  case tok::annot_pragma_fenv_access:
751  HandlePragmaFEnvAccess();
752  return nullptr;
753  case tok::annot_pragma_float_control:
754  HandlePragmaFloatControl();
755  return nullptr;
756  case tok::annot_pragma_fp:
757  HandlePragmaFP();
758  break;
759  case tok::annot_pragma_opencl_extension:
760  HandlePragmaOpenCLExtension();
761  return nullptr;
762  case tok::annot_pragma_openmp: {
764  return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
765  }
766  case tok::annot_pragma_ms_pointers_to_members:
767  HandlePragmaMSPointersToMembers();
768  return nullptr;
769  case tok::annot_pragma_ms_vtordisp:
770  HandlePragmaMSVtorDisp();
771  return nullptr;
772  case tok::annot_pragma_ms_pragma:
773  HandlePragmaMSPragma();
774  return nullptr;
775  case tok::annot_pragma_dump:
776  HandlePragmaDump();
777  return nullptr;
778  case tok::annot_pragma_attribute:
779  HandlePragmaAttribute();
780  return nullptr;
781  case tok::semi:
782  // Either a C++11 empty-declaration or attribute-declaration.
783  SingleDecl =
784  Actions.ActOnEmptyDeclaration(getCurScope(), attrs, Tok.getLocation());
785  ConsumeExtraSemi(OutsideFunction);
786  break;
787  case tok::r_brace:
788  Diag(Tok, diag::err_extraneous_closing_brace);
789  ConsumeBrace();
790  return nullptr;
791  case tok::eof:
792  Diag(Tok, diag::err_expected_external_declaration);
793  return nullptr;
794  case tok::kw___extension__: {
795  // __extension__ silences extension warnings in the subexpression.
796  ExtensionRAIIObject O(Diags); // Use RAII to do this.
797  ConsumeToken();
798  return ParseExternalDeclaration(attrs);
799  }
800  case tok::kw_asm: {
801  ProhibitAttributes(attrs);
802 
803  SourceLocation StartLoc = Tok.getLocation();
804  SourceLocation EndLoc;
805 
806  ExprResult Result(ParseSimpleAsm(/*ForAsmLabel*/ false, &EndLoc));
807 
808  // Check if GNU-style InlineAsm is disabled.
809  // Empty asm string is allowed because it will not introduce
810  // any assembly code.
811  if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
812  const auto *SL = cast<StringLiteral>(Result.get());
813  if (!SL->getString().trim().empty())
814  Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
815  }
816 
817  ExpectAndConsume(tok::semi, diag::err_expected_after,
818  "top-level asm block");
819 
820  if (Result.isInvalid())
821  return nullptr;
822  SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
823  break;
824  }
825  case tok::at:
826  return ParseObjCAtDirectives(attrs);
827  case tok::minus:
828  case tok::plus:
829  if (!getLangOpts().ObjC) {
830  Diag(Tok, diag::err_expected_external_declaration);
831  ConsumeToken();
832  return nullptr;
833  }
834  SingleDecl = ParseObjCMethodDefinition();
835  break;
836  case tok::code_completion:
837  if (CurParsedObjCImpl) {
838  // Code-complete Objective-C methods even without leading '-'/'+' prefix.
840  /*IsInstanceMethod=*/None,
841  /*ReturnType=*/nullptr);
842  }
843  Actions.CodeCompleteOrdinaryName(
844  getCurScope(),
845  CurParsedObjCImpl ? Sema::PCC_ObjCImplementation : Sema::PCC_Namespace);
846  cutOffParsing();
847  return nullptr;
848  case tok::kw_import:
849  SingleDecl = ParseModuleImport(SourceLocation());
850  break;
851  case tok::kw_export:
852  if (getLangOpts().CPlusPlusModules || getLangOpts().ModulesTS) {
853  SingleDecl = ParseExportDeclaration();
854  break;
855  }
856  // This must be 'export template'. Parse it so we can diagnose our lack
857  // of support.
858  LLVM_FALLTHROUGH;
859  case tok::kw_using:
860  case tok::kw_namespace:
861  case tok::kw_typedef:
862  case tok::kw_template:
863  case tok::kw_static_assert:
864  case tok::kw__Static_assert:
865  // A function definition cannot start with any of these keywords.
866  {
867  SourceLocation DeclEnd;
868  return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
869  }
870 
871  case tok::kw_static:
872  // Parse (then ignore) 'static' prior to a template instantiation. This is
873  // a GCC extension that we intentionally do not support.
874  if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
875  Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
876  << 0;
877  SourceLocation DeclEnd;
878  return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
879  }
880  goto dont_know;
881 
882  case tok::kw_inline:
883  if (getLangOpts().CPlusPlus) {
884  tok::TokenKind NextKind = NextToken().getKind();
885 
886  // Inline namespaces. Allowed as an extension even in C++03.
887  if (NextKind == tok::kw_namespace) {
888  SourceLocation DeclEnd;
889  return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
890  }
891 
892  // Parse (then ignore) 'inline' prior to a template instantiation. This is
893  // a GCC extension that we intentionally do not support.
894  if (NextKind == tok::kw_template) {
895  Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
896  << 1;
897  SourceLocation DeclEnd;
898  return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
899  }
900  }
901  goto dont_know;
902 
903  case tok::kw_extern:
904  if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
905  // Extern templates
906  SourceLocation ExternLoc = ConsumeToken();
907  SourceLocation TemplateLoc = ConsumeToken();
908  Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
909  diag::warn_cxx98_compat_extern_template :
910  diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
911  SourceLocation DeclEnd;
912  return Actions.ConvertDeclToDeclGroup(
913  ParseExplicitInstantiation(DeclaratorContext::FileContext, ExternLoc,
914  TemplateLoc, DeclEnd, attrs));
915  }
916  goto dont_know;
917 
918  case tok::kw___if_exists:
919  case tok::kw___if_not_exists:
920  ParseMicrosoftIfExistsExternalDeclaration();
921  return nullptr;
922 
923  case tok::kw_module:
924  Diag(Tok, diag::err_unexpected_module_decl);
925  SkipUntil(tok::semi);
926  return nullptr;
927 
928  default:
929  dont_know:
930  if (Tok.isEditorPlaceholder()) {
931  ConsumeToken();
932  return nullptr;
933  }
934  // We can't tell whether this is a function-definition or declaration yet.
935  return ParseDeclarationOrFunctionDefinition(attrs, DS);
936  }
937 
938  // This routine returns a DeclGroup, if the thing we parsed only contains a
939  // single decl, convert it now.
940  return Actions.ConvertDeclToDeclGroup(SingleDecl);
941 }
942 
943 /// Determine whether the current token, if it occurs after a
944 /// declarator, continues a declaration or declaration list.
945 bool Parser::isDeclarationAfterDeclarator() {
946  // Check for '= delete' or '= default'
947  if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
948  const Token &KW = NextToken();
949  if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
950  return false;
951  }
952 
953  return Tok.is(tok::equal) || // int X()= -> not a function def
954  Tok.is(tok::comma) || // int X(), -> not a function def
955  Tok.is(tok::semi) || // int X(); -> not a function def
956  Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
957  Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
958  (getLangOpts().CPlusPlus &&
959  Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
960 }
961 
962 /// Determine whether the current token, if it occurs after a
963 /// declarator, indicates the start of a function definition.
964 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
965  assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
966  if (Tok.is(tok::l_brace)) // int X() {}
967  return true;
968 
969  // Handle K&R C argument lists: int X(f) int f; {}
970  if (!getLangOpts().CPlusPlus &&
971  Declarator.getFunctionTypeInfo().isKNRPrototype())
972  return isDeclarationSpecifier();
973 
974  if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
975  const Token &KW = NextToken();
976  return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
977  }
978 
979  return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
980  Tok.is(tok::kw_try); // X() try { ... }
981 }
982 
983 /// Parse either a function-definition or a declaration. We can't tell which
984 /// we have until we read up to the compound-statement in function-definition.
985 /// TemplateParams, if non-NULL, provides the template parameters when we're
986 /// parsing a C++ template-declaration.
987 ///
988 /// function-definition: [C99 6.9.1]
989 /// decl-specs declarator declaration-list[opt] compound-statement
990 /// [C90] function-definition: [C99 6.7.1] - implicit int result
991 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
992 ///
993 /// declaration: [C99 6.7]
994 /// declaration-specifiers init-declarator-list[opt] ';'
995 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
996 /// [OMP] threadprivate-directive
997 /// [OMP] allocate-directive [TODO]
998 ///
1000 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
1001  ParsingDeclSpec &DS,
1002  AccessSpecifier AS) {
1003  MaybeParseMicrosoftAttributes(DS.getAttributes());
1004  // Parse the common declaration-specifiers piece.
1005  ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS,
1006  DeclSpecContext::DSC_top_level);
1007 
1008  // If we had a free-standing type definition with a missing semicolon, we
1009  // may get this far before the problem becomes obvious.
1010  if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
1011  DS, AS, DeclSpecContext::DSC_top_level))
1012  return nullptr;
1013 
1014  // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1015  // declaration-specifiers init-declarator-list[opt] ';'
1016  if (Tok.is(tok::semi)) {
1017  auto LengthOfTSTToken = [](DeclSpec::TST TKind) {
1018  assert(DeclSpec::isDeclRep(TKind));
1019  switch(TKind) {
1020  case DeclSpec::TST_class:
1021  return 5;
1022  case DeclSpec::TST_struct:
1023  return 6;
1024  case DeclSpec::TST_union:
1025  return 5;
1026  case DeclSpec::TST_enum:
1027  return 4;
1029  return 9;
1030  default:
1031  llvm_unreachable("we only expect to get the length of the class/struct/union/enum");
1032  }
1033 
1034  };
1035  // Suggest correct location to fix '[[attrib]] struct' to 'struct [[attrib]]'
1036  SourceLocation CorrectLocationForAttributes =
1039  LengthOfTSTToken(DS.getTypeSpecType()))
1040  : SourceLocation();
1041  ProhibitAttributes(attrs, CorrectLocationForAttributes);
1042  ConsumeToken();
1043  RecordDecl *AnonRecord = nullptr;
1044  Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
1045  DS, AnonRecord);
1046  DS.complete(TheDecl);
1047  if (getLangOpts().OpenCL)
1048  Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
1049  if (AnonRecord) {
1050  Decl* decls[] = {AnonRecord, TheDecl};
1051  return Actions.BuildDeclaratorGroup(decls);
1052  }
1053  return Actions.ConvertDeclToDeclGroup(TheDecl);
1054  }
1055 
1056  DS.takeAttributesFrom(attrs);
1057 
1058  // ObjC2 allows prefix attributes on class interfaces and protocols.
1059  // FIXME: This still needs better diagnostics. We should only accept
1060  // attributes here, no types, etc.
1061  if (getLangOpts().ObjC && Tok.is(tok::at)) {
1062  SourceLocation AtLoc = ConsumeToken(); // the "@"
1063  if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
1064  !Tok.isObjCAtKeyword(tok::objc_protocol) &&
1065  !Tok.isObjCAtKeyword(tok::objc_implementation)) {
1066  Diag(Tok, diag::err_objc_unexpected_attr);
1067  SkipUntil(tok::semi);
1068  return nullptr;
1069  }
1070 
1071  DS.abort();
1072 
1073  const char *PrevSpec = nullptr;
1074  unsigned DiagID;
1075  if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
1076  Actions.getASTContext().getPrintingPolicy()))
1077  Diag(AtLoc, DiagID) << PrevSpec;
1078 
1079  if (Tok.isObjCAtKeyword(tok::objc_protocol))
1080  return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
1081 
1082  if (Tok.isObjCAtKeyword(tok::objc_implementation))
1083  return ParseObjCAtImplementationDeclaration(AtLoc, DS.getAttributes());
1084 
1085  return Actions.ConvertDeclToDeclGroup(
1086  ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
1087  }
1088 
1089  // If the declspec consisted only of 'extern' and we have a string
1090  // literal following it, this must be a C++ linkage specifier like
1091  // 'extern "C"'.
1092  if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
1095  Decl *TheDecl = ParseLinkage(DS, DeclaratorContext::FileContext);
1096  return Actions.ConvertDeclToDeclGroup(TheDecl);
1097  }
1098 
1099  return ParseDeclGroup(DS, DeclaratorContext::FileContext);
1100 }
1101 
1103 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
1104  ParsingDeclSpec *DS,
1105  AccessSpecifier AS) {
1106  if (DS) {
1107  return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
1108  } else {
1109  ParsingDeclSpec PDS(*this);
1110  // Must temporarily exit the objective-c container scope for
1111  // parsing c constructs and re-enter objc container scope
1112  // afterwards.
1113  ObjCDeclContextSwitch ObjCDC(*this);
1114 
1115  return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1116  }
1117 }
1118 
1119 /// ParseFunctionDefinition - We parsed and verified that the specified
1120 /// Declarator is well formed. If this is a K&R-style function, read the
1121 /// parameters declaration-list, then start the compound-statement.
1122 ///
1123 /// function-definition: [C99 6.9.1]
1124 /// decl-specs declarator declaration-list[opt] compound-statement
1125 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1126 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1127 /// [C++] function-definition: [C++ 8.4]
1128 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1129 /// function-body
1130 /// [C++] function-definition: [C++ 8.4]
1131 /// decl-specifier-seq[opt] declarator function-try-block
1132 ///
1133 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1134  const ParsedTemplateInfo &TemplateInfo,
1135  LateParsedAttrList *LateParsedAttrs) {
1136  // Poison SEH identifiers so they are flagged as illegal in function bodies.
1137  PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1139  TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1140 
1141  // If this is C90 and the declspecs were completely missing, fudge in an
1142  // implicit int. We do this here because this is the only place where
1143  // declaration-specifiers are completely optional in the grammar.
1144  if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1145  const char *PrevSpec;
1146  unsigned DiagID;
1147  const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1149  D.getIdentifierLoc(),
1150  PrevSpec, DiagID,
1151  Policy);
1153  }
1154 
1155  // If this declaration was formed with a K&R-style identifier list for the
1156  // arguments, parse declarations for all of the args next.
1157  // int foo(a,b) int a; float b; {}
1158  if (FTI.isKNRPrototype())
1159  ParseKNRParamDeclarations(D);
1160 
1161  // We should have either an opening brace or, in a C++ constructor,
1162  // we may have a colon.
1163  if (Tok.isNot(tok::l_brace) &&
1164  (!getLangOpts().CPlusPlus ||
1165  (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1166  Tok.isNot(tok::equal)))) {
1167  Diag(Tok, diag::err_expected_fn_body);
1168 
1169  // Skip over garbage, until we get to '{'. Don't eat the '{'.
1170  SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1171 
1172  // If we didn't find the '{', bail out.
1173  if (Tok.isNot(tok::l_brace))
1174  return nullptr;
1175  }
1176 
1177  // Check to make sure that any normal attributes are allowed to be on
1178  // a definition. Late parsed attributes are checked at the end.
1179  if (Tok.isNot(tok::equal)) {
1180  for (const ParsedAttr &AL : D.getAttributes())
1181  if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
1182  Diag(AL.getLoc(), diag::warn_attribute_on_function_definition) << AL;
1183  }
1184 
1185  // In delayed template parsing mode, for function template we consume the
1186  // tokens and store them for late parsing at the end of the translation unit.
1187  if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1188  TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1189  Actions.canDelayFunctionBody(D)) {
1190  MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1191 
1192  ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1194  Scope *ParentScope = getCurScope()->getParent();
1195 
1197  Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1198  TemplateParameterLists);
1199  D.complete(DP);
1200  D.getMutableDeclSpec().abort();
1201 
1202  if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1203  trySkippingFunctionBody()) {
1204  BodyScope.Exit();
1205  return Actions.ActOnSkippedFunctionBody(DP);
1206  }
1207 
1208  CachedTokens Toks;
1209  LexTemplateFunctionForLateParsing(Toks);
1210 
1211  if (DP) {
1212  FunctionDecl *FnD = DP->getAsFunction();
1213  Actions.CheckForFunctionRedefinition(FnD);
1214  Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1215  }
1216  return DP;
1217  }
1218  else if (CurParsedObjCImpl &&
1219  !TemplateInfo.TemplateParams &&
1220  (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1221  Tok.is(tok::colon)) &&
1222  Actions.CurContext->isTranslationUnit()) {
1223  ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1225  Scope *ParentScope = getCurScope()->getParent();
1226 
1228  Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1230  D.complete(FuncDecl);
1231  D.getMutableDeclSpec().abort();
1232  if (FuncDecl) {
1233  // Consume the tokens and store them for later parsing.
1234  StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1235  CurParsedObjCImpl->HasCFunction = true;
1236  return FuncDecl;
1237  }
1238  // FIXME: Should we really fall through here?
1239  }
1240 
1241  // Enter a scope for the function body.
1242  ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1244 
1245  // Tell the actions module that we have entered a function definition with the
1246  // specified Declarator for the function.
1247  Sema::SkipBodyInfo SkipBody;
1248  Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1249  TemplateInfo.TemplateParams
1250  ? *TemplateInfo.TemplateParams
1252  &SkipBody);
1253 
1254  if (SkipBody.ShouldSkip) {
1255  SkipFunctionBody();
1256  return Res;
1257  }
1258 
1259  // Break out of the ParsingDeclarator context before we parse the body.
1260  D.complete(Res);
1261 
1262  // Break out of the ParsingDeclSpec context, too. This const_cast is
1263  // safe because we're always the sole owner.
1264  D.getMutableDeclSpec().abort();
1265 
1266  // With abbreviated function templates - we need to explicitly add depth to
1267  // account for the implicit template parameter list induced by the template.
1268  if (auto *Template = dyn_cast_or_null<FunctionTemplateDecl>(Res))
1269  if (Template->isAbbreviated() &&
1270  Template->getTemplateParameters()->getParam(0)->isImplicit())
1271  // First template parameter is implicit - meaning no explicit template
1272  // parameter list was specified.
1273  CurTemplateDepthTracker.addDepth(1);
1274 
1275  if (TryConsumeToken(tok::equal)) {
1276  assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1277 
1278  bool Delete = false;
1279  SourceLocation KWLoc;
1280  if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1281  Diag(KWLoc, getLangOpts().CPlusPlus11
1282  ? diag::warn_cxx98_compat_defaulted_deleted_function
1283  : diag::ext_defaulted_deleted_function)
1284  << 1 /* deleted */;
1285  Actions.SetDeclDeleted(Res, KWLoc);
1286  Delete = true;
1287  } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1288  Diag(KWLoc, getLangOpts().CPlusPlus11
1289  ? diag::warn_cxx98_compat_defaulted_deleted_function
1290  : diag::ext_defaulted_deleted_function)
1291  << 0 /* defaulted */;
1292  Actions.SetDeclDefaulted(Res, KWLoc);
1293  } else {
1294  llvm_unreachable("function definition after = not 'delete' or 'default'");
1295  }
1296 
1297  if (Tok.is(tok::comma)) {
1298  Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1299  << Delete;
1300  SkipUntil(tok::semi);
1301  } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1302  Delete ? "delete" : "default")) {
1303  SkipUntil(tok::semi);
1304  }
1305 
1306  Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1307  Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1308  return Res;
1309  }
1310 
1311  if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1312  trySkippingFunctionBody()) {
1313  BodyScope.Exit();
1314  Actions.ActOnSkippedFunctionBody(Res);
1315  return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1316  }
1317 
1318  if (Tok.is(tok::kw_try))
1319  return ParseFunctionTryBlock(Res, BodyScope);
1320 
1321  // If we have a colon, then we're probably parsing a C++
1322  // ctor-initializer.
1323  if (Tok.is(tok::colon)) {
1324  ParseConstructorInitializer(Res);
1325 
1326  // Recover from error.
1327  if (!Tok.is(tok::l_brace)) {
1328  BodyScope.Exit();
1329  Actions.ActOnFinishFunctionBody(Res, nullptr);
1330  return Res;
1331  }
1332  } else
1333  Actions.ActOnDefaultCtorInitializers(Res);
1334 
1335  // Late attributes are parsed in the same scope as the function body.
1336  if (LateParsedAttrs)
1337  ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1338 
1339  return ParseFunctionStatementBody(Res, BodyScope);
1340 }
1341 
1342 void Parser::SkipFunctionBody() {
1343  if (Tok.is(tok::equal)) {
1344  SkipUntil(tok::semi);
1345  return;
1346  }
1347 
1348  bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1349  if (IsFunctionTryBlock)
1350  ConsumeToken();
1351 
1352  CachedTokens Skipped;
1353  if (ConsumeAndStoreFunctionPrologue(Skipped))
1355  else {
1356  SkipUntil(tok::r_brace);
1357  while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1358  SkipUntil(tok::l_brace);
1359  SkipUntil(tok::r_brace);
1360  }
1361  }
1362 }
1363 
1364 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1365 /// types for a function with a K&R-style identifier list for arguments.
1366 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1367  // We know that the top-level of this declarator is a function.
1369 
1370  // Enter function-declaration scope, limiting any declarators to the
1371  // function prototype scope, including parameter declarators.
1372  ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1374 
1375  // Read all the argument declarations.
1376  while (isDeclarationSpecifier()) {
1377  SourceLocation DSStart = Tok.getLocation();
1378 
1379  // Parse the common declaration-specifiers piece.
1380  DeclSpec DS(AttrFactory);
1381  ParseDeclarationSpecifiers(DS);
1382 
1383  // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1384  // least one declarator'.
1385  // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1386  // the declarations though. It's trivial to ignore them, really hard to do
1387  // anything else with them.
1388  if (TryConsumeToken(tok::semi)) {
1389  Diag(DSStart, diag::err_declaration_does_not_declare_param);
1390  continue;
1391  }
1392 
1393  // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1394  // than register.
1398  diag::err_invalid_storage_class_in_func_decl);
1400  }
1403  diag::err_invalid_storage_class_in_func_decl);
1405  }
1406 
1407  // Parse the first declarator attached to this declspec.
1408  Declarator ParmDeclarator(DS, DeclaratorContext::KNRTypeListContext);
1409  ParseDeclarator(ParmDeclarator);
1410 
1411  // Handle the full declarator list.
1412  while (1) {
1413  // If attributes are present, parse them.
1414  MaybeParseGNUAttributes(ParmDeclarator);
1415 
1416  // Ask the actions module to compute the type for this declarator.
1417  Decl *Param =
1418  Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1419 
1420  if (Param &&
1421  // A missing identifier has already been diagnosed.
1422  ParmDeclarator.getIdentifier()) {
1423 
1424  // Scan the argument list looking for the correct param to apply this
1425  // type.
1426  for (unsigned i = 0; ; ++i) {
1427  // C99 6.9.1p6: those declarators shall declare only identifiers from
1428  // the identifier list.
1429  if (i == FTI.NumParams) {
1430  Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1431  << ParmDeclarator.getIdentifier();
1432  break;
1433  }
1434 
1435  if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1436  // Reject redefinitions of parameters.
1437  if (FTI.Params[i].Param) {
1438  Diag(ParmDeclarator.getIdentifierLoc(),
1439  diag::err_param_redefinition)
1440  << ParmDeclarator.getIdentifier();
1441  } else {
1442  FTI.Params[i].Param = Param;
1443  }
1444  break;
1445  }
1446  }
1447  }
1448 
1449  // If we don't have a comma, it is either the end of the list (a ';') or
1450  // an error, bail out.
1451  if (Tok.isNot(tok::comma))
1452  break;
1453 
1454  ParmDeclarator.clear();
1455 
1456  // Consume the comma.
1457  ParmDeclarator.setCommaLoc(ConsumeToken());
1458 
1459  // Parse the next declarator.
1460  ParseDeclarator(ParmDeclarator);
1461  }
1462 
1463  // Consume ';' and continue parsing.
1464  if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1465  continue;
1466 
1467  // Otherwise recover by skipping to next semi or mandatory function body.
1468  if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1469  break;
1470  TryConsumeToken(tok::semi);
1471  }
1472 
1473  // The actions module must verify that all arguments were declared.
1475 }
1476 
1477 
1478 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1479 /// allowed to be a wide string, and is not subject to character translation.
1480 /// Unlike GCC, we also diagnose an empty string literal when parsing for an
1481 /// asm label as opposed to an asm statement, because such a construct does not
1482 /// behave well.
1483 ///
1484 /// [GNU] asm-string-literal:
1485 /// string-literal
1486 ///
1487 ExprResult Parser::ParseAsmStringLiteral(bool ForAsmLabel) {
1488  if (!isTokenStringLiteral()) {
1489  Diag(Tok, diag::err_expected_string_literal)
1490  << /*Source='in...'*/0 << "'asm'";
1491  return ExprError();
1492  }
1493 
1495  if (!AsmString.isInvalid()) {
1496  const auto *SL = cast<StringLiteral>(AsmString.get());
1497  if (!SL->isAscii()) {
1498  Diag(Tok, diag::err_asm_operand_wide_string_literal)
1499  << SL->isWide()
1500  << SL->getSourceRange();
1501  return ExprError();
1502  }
1503  if (ForAsmLabel && SL->getString().empty()) {
1504  Diag(Tok, diag::err_asm_operand_wide_string_literal)
1505  << 2 /* an empty */ << SL->getSourceRange();
1506  return ExprError();
1507  }
1508  }
1509  return AsmString;
1510 }
1511 
1512 /// ParseSimpleAsm
1513 ///
1514 /// [GNU] simple-asm-expr:
1515 /// 'asm' '(' asm-string-literal ')'
1516 ///
1517 ExprResult Parser::ParseSimpleAsm(bool ForAsmLabel, SourceLocation *EndLoc) {
1518  assert(Tok.is(tok::kw_asm) && "Not an asm!");
1519  SourceLocation Loc = ConsumeToken();
1520 
1521  if (isGNUAsmQualifier(Tok)) {
1522  // Remove from the end of 'asm' to the end of the asm qualifier.
1523  SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1524  PP.getLocForEndOfToken(Tok.getLocation()));
1525  Diag(Tok, diag::err_global_asm_qualifier_ignored)
1526  << GNUAsmQualifiers::getQualifierName(getGNUAsmQualifier(Tok))
1527  << FixItHint::CreateRemoval(RemovalRange);
1528  ConsumeToken();
1529  }
1530 
1531  BalancedDelimiterTracker T(*this, tok::l_paren);
1532  if (T.consumeOpen()) {
1533  Diag(Tok, diag::err_expected_lparen_after) << "asm";
1534  return ExprError();
1535  }
1536 
1537  ExprResult Result(ParseAsmStringLiteral(ForAsmLabel));
1538 
1539  if (!Result.isInvalid()) {
1540  // Close the paren and get the location of the end bracket
1541  T.consumeClose();
1542  if (EndLoc)
1543  *EndLoc = T.getCloseLocation();
1544  } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1545  if (EndLoc)
1546  *EndLoc = Tok.getLocation();
1547  ConsumeParen();
1548  }
1549 
1550  return Result;
1551 }
1552 
1553 /// Get the TemplateIdAnnotation from the token and put it in the
1554 /// cleanup pool so that it gets destroyed when parsing the current top level
1555 /// declaration is finished.
1556 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1557  assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1559  Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1560  return Id;
1561 }
1562 
1563 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1564  // Push the current token back into the token stream (or revert it if it is
1565  // cached) and use an annotation scope token for current token.
1566  if (PP.isBacktrackEnabled())
1567  PP.RevertCachedTokens(1);
1568  else
1569  PP.EnterToken(Tok, /*IsReinject=*/true);
1570  Tok.setKind(tok::annot_cxxscope);
1572  Tok.setAnnotationRange(SS.getRange());
1573 
1574  // In case the tokens were cached, have Preprocessor replace them
1575  // with the annotation token. We don't need to do this if we've
1576  // just reverted back to a prior state.
1577  if (IsNewAnnotation)
1578  PP.AnnotateCachedTokens(Tok);
1579 }
1580 
1581 /// Attempt to classify the name at the current token position. This may
1582 /// form a type, scope or primary expression annotation, or replace the token
1583 /// with a typo-corrected keyword. This is only appropriate when the current
1584 /// name must refer to an entity which has already been declared.
1585 ///
1586 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1587 /// no typo correction will be performed.
1588 Parser::AnnotatedNameKind
1589 Parser::TryAnnotateName(CorrectionCandidateCallback *CCC) {
1590  assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1591 
1592  const bool EnteringContext = false;
1593  const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1594 
1595  CXXScopeSpec SS;
1596  if (getLangOpts().CPlusPlus &&
1597  ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1598  /*ObjectHadErrors=*/false,
1599  EnteringContext))
1600  return ANK_Error;
1601 
1602  if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1603  if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1604  return ANK_Error;
1605  return ANK_Unresolved;
1606  }
1607 
1608  IdentifierInfo *Name = Tok.getIdentifierInfo();
1609  SourceLocation NameLoc = Tok.getLocation();
1610 
1611  // FIXME: Move the tentative declaration logic into ClassifyName so we can
1612  // typo-correct to tentatively-declared identifiers.
1613  if (isTentativelyDeclared(Name)) {
1614  // Identifier has been tentatively declared, and thus cannot be resolved as
1615  // an expression. Fall back to annotating it as a type.
1616  if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1617  return ANK_Error;
1618  return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1619  }
1620 
1621  Token Next = NextToken();
1622 
1623  // Look up and classify the identifier. We don't perform any typo-correction
1624  // after a scope specifier, because in general we can't recover from typos
1625  // there (eg, after correcting 'A::template B<X>::C' [sic], we would need to
1626  // jump back into scope specifier parsing).
1627  Sema::NameClassification Classification = Actions.ClassifyName(
1628  getCurScope(), SS, Name, NameLoc, Next, SS.isEmpty() ? CCC : nullptr);
1629 
1630  // If name lookup found nothing and we guessed that this was a template name,
1631  // double-check before committing to that interpretation. C++20 requires that
1632  // we interpret this as a template-id if it can be, but if it can't be, then
1633  // this is an error recovery case.
1634  if (Classification.getKind() == Sema::NC_UndeclaredTemplate &&
1635  isTemplateArgumentList(1) == TPResult::False) {
1636  // It's not a template-id; re-classify without the '<' as a hint.
1637  Token FakeNext = Next;
1638  FakeNext.setKind(tok::unknown);
1639  Classification =
1640  Actions.ClassifyName(getCurScope(), SS, Name, NameLoc, FakeNext,
1641  SS.isEmpty() ? CCC : nullptr);
1642  }
1643 
1644  switch (Classification.getKind()) {
1645  case Sema::NC_Error:
1646  return ANK_Error;
1647 
1648  case Sema::NC_Keyword:
1649  // The identifier was typo-corrected to a keyword.
1650  Tok.setIdentifierInfo(Name);
1651  Tok.setKind(Name->getTokenID());
1652  PP.TypoCorrectToken(Tok);
1653  if (SS.isNotEmpty())
1654  AnnotateScopeToken(SS, !WasScopeAnnotation);
1655  // We've "annotated" this as a keyword.
1656  return ANK_Success;
1657 
1658  case Sema::NC_Unknown:
1659  // It's not something we know about. Leave it unannotated.
1660  break;
1661 
1662  case Sema::NC_Type: {
1663  SourceLocation BeginLoc = NameLoc;
1664  if (SS.isNotEmpty())
1665  BeginLoc = SS.getBeginLoc();
1666 
1667  /// An Objective-C object type followed by '<' is a specialization of
1668  /// a parameterized class type or a protocol-qualified type.
1669  ParsedType Ty = Classification.getType();
1670  if (getLangOpts().ObjC && NextToken().is(tok::less) &&
1671  (Ty.get()->isObjCObjectType() ||
1672  Ty.get()->isObjCObjectPointerType())) {
1673  // Consume the name.
1675  SourceLocation NewEndLoc;
1676  TypeResult NewType
1677  = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1678  /*consumeLastToken=*/false,
1679  NewEndLoc);
1680  if (NewType.isUsable())
1681  Ty = NewType.get();
1682  else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1683  return ANK_Error;
1684  }
1685 
1686  Tok.setKind(tok::annot_typename);
1687  setTypeAnnotation(Tok, Ty);
1688  Tok.setAnnotationEndLoc(Tok.getLocation());
1689  Tok.setLocation(BeginLoc);
1690  PP.AnnotateCachedTokens(Tok);
1691  return ANK_Success;
1692  }
1693 
1695  Tok.setKind(Actions.isUnevaluatedContext() ? tok::annot_uneval_primary_expr
1696  : tok::annot_primary_expr);
1697  setExprAnnotation(Tok, Classification.getExpression());
1698  Tok.setAnnotationEndLoc(NameLoc);
1699  if (SS.isNotEmpty())
1700  Tok.setLocation(SS.getBeginLoc());
1701  PP.AnnotateCachedTokens(Tok);
1702  return ANK_Success;
1703 
1704  case Sema::NC_NonType:
1705  Tok.setKind(tok::annot_non_type);
1706  setNonTypeAnnotation(Tok, Classification.getNonTypeDecl());
1707  Tok.setLocation(NameLoc);
1708  Tok.setAnnotationEndLoc(NameLoc);
1709  PP.AnnotateCachedTokens(Tok);
1710  if (SS.isNotEmpty())
1711  AnnotateScopeToken(SS, !WasScopeAnnotation);
1712  return ANK_Success;
1713 
1716  Tok.setKind(Classification.getKind() == Sema::NC_UndeclaredNonType
1717  ? tok::annot_non_type_undeclared
1718  : tok::annot_non_type_dependent);
1719  setIdentifierAnnotation(Tok, Name);
1720  Tok.setLocation(NameLoc);
1721  Tok.setAnnotationEndLoc(NameLoc);
1722  PP.AnnotateCachedTokens(Tok);
1723  if (SS.isNotEmpty())
1724  AnnotateScopeToken(SS, !WasScopeAnnotation);
1725  return ANK_Success;
1726 
1727  case Sema::NC_TypeTemplate:
1728  if (Next.isNot(tok::less)) {
1729  // This may be a type template being used as a template template argument.
1730  if (SS.isNotEmpty())
1731  AnnotateScopeToken(SS, !WasScopeAnnotation);
1732  return ANK_TemplateName;
1733  }
1734  LLVM_FALLTHROUGH;
1735  case Sema::NC_VarTemplate:
1738  // We have a type, variable or function template followed by '<'.
1739  ConsumeToken();
1740  UnqualifiedId Id;
1741  Id.setIdentifier(Name, NameLoc);
1742  if (AnnotateTemplateIdToken(
1743  TemplateTy::make(Classification.getTemplateName()),
1744  Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1745  return ANK_Error;
1746  return ANK_Success;
1747  }
1748  case Sema::NC_Concept: {
1749  UnqualifiedId Id;
1750  Id.setIdentifier(Name, NameLoc);
1751  if (Next.is(tok::less))
1752  // We have a concept name followed by '<'. Consume the identifier token so
1753  // we reach the '<' and annotate it.
1754  ConsumeToken();
1755  if (AnnotateTemplateIdToken(
1756  TemplateTy::make(Classification.getTemplateName()),
1757  Classification.getTemplateNameKind(), SS, SourceLocation(), Id,
1758  /*AllowTypeAnnotation=*/false, /*TypeConstraint=*/true))
1759  return ANK_Error;
1760  return ANK_Success;
1761  }
1762  }
1763 
1764  // Unable to classify the name, but maybe we can annotate a scope specifier.
1765  if (SS.isNotEmpty())
1766  AnnotateScopeToken(SS, !WasScopeAnnotation);
1767  return ANK_Unresolved;
1768 }
1769 
1770 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1771  assert(Tok.isNot(tok::identifier));
1772  Diag(Tok, diag::ext_keyword_as_ident)
1773  << PP.getSpelling(Tok)
1774  << DisableKeyword;
1775  if (DisableKeyword)
1777  Tok.setKind(tok::identifier);
1778  return true;
1779 }
1780 
1781 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1782 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1783 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1784 /// with a single annotation token representing the typename or C++ scope
1785 /// respectively.
1786 /// This simplifies handling of C++ scope specifiers and allows efficient
1787 /// backtracking without the need to re-parse and resolve nested-names and
1788 /// typenames.
1789 /// It will mainly be called when we expect to treat identifiers as typenames
1790 /// (if they are typenames). For example, in C we do not expect identifiers
1791 /// inside expressions to be treated as typenames so it will not be called
1792 /// for expressions in C.
1793 /// The benefit for C/ObjC is that a typename will be annotated and
1794 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1795 /// will not be called twice, once to check whether we have a declaration
1796 /// specifier, and another one to get the actual type inside
1797 /// ParseDeclarationSpecifiers).
1798 ///
1799 /// This returns true if an error occurred.
1800 ///
1801 /// Note that this routine emits an error if you call it with ::new or ::delete
1802 /// as the current tokens, so only call it in contexts where these are invalid.
1804  assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1805  Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1806  Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1807  Tok.is(tok::kw___super)) &&
1808  "Cannot be a type or scope token!");
1809 
1810  if (Tok.is(tok::kw_typename)) {
1811  // MSVC lets you do stuff like:
1812  // typename typedef T_::D D;
1813  //
1814  // We will consume the typedef token here and put it back after we have
1815  // parsed the first identifier, transforming it into something more like:
1816  // typename T_::D typedef D;
1817  if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1818  Token TypedefToken;
1819  PP.Lex(TypedefToken);
1821  PP.EnterToken(Tok, /*IsReinject=*/true);
1822  Tok = TypedefToken;
1823  if (!Result)
1824  Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1825  return Result;
1826  }
1827 
1828  // Parse a C++ typename-specifier, e.g., "typename T::type".
1829  //
1830  // typename-specifier:
1831  // 'typename' '::' [opt] nested-name-specifier identifier
1832  // 'typename' '::' [opt] nested-name-specifier template [opt]
1833  // simple-template-id
1834  SourceLocation TypenameLoc = ConsumeToken();
1835  CXXScopeSpec SS;
1836  if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1837  /*ObjectHadErrors=*/false,
1838  /*EnteringContext=*/false, nullptr,
1839  /*IsTypename*/ true))
1840  return true;
1841  if (SS.isEmpty()) {
1842  if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1843  Tok.is(tok::annot_decltype)) {
1844  // Attempt to recover by skipping the invalid 'typename'
1845  if (Tok.is(tok::annot_decltype) ||
1846  (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1847  unsigned DiagID = diag::err_expected_qualified_after_typename;
1848  // MS compatibility: MSVC permits using known types with typename.
1849  // e.g. "typedef typename T* pointer_type"
1850  if (getLangOpts().MicrosoftExt)
1851  DiagID = diag::warn_expected_qualified_after_typename;
1852  Diag(Tok.getLocation(), DiagID);
1853  return false;
1854  }
1855  }
1856  if (Tok.isEditorPlaceholder())
1857  return true;
1858 
1859  Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1860  return true;
1861  }
1862 
1863  TypeResult Ty;
1864  if (Tok.is(tok::identifier)) {
1865  // FIXME: check whether the next token is '<', first!
1866  Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1867  *Tok.getIdentifierInfo(),
1868  Tok.getLocation());
1869  } else if (Tok.is(tok::annot_template_id)) {
1870  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1871  if (!TemplateId->mightBeType()) {
1872  Diag(Tok, diag::err_typename_refers_to_non_type_template)
1873  << Tok.getAnnotationRange();
1874  return true;
1875  }
1876 
1877  ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1878  TemplateId->NumArgs);
1879 
1880  Ty = TemplateId->isInvalid()
1881  ? TypeError()
1882  : Actions.ActOnTypenameType(
1883  getCurScope(), TypenameLoc, SS, TemplateId->TemplateKWLoc,
1884  TemplateId->Template, TemplateId->Name,
1885  TemplateId->TemplateNameLoc, TemplateId->LAngleLoc,
1886  TemplateArgsPtr, TemplateId->RAngleLoc);
1887  } else {
1888  Diag(Tok, diag::err_expected_type_name_after_typename)
1889  << SS.getRange();
1890  return true;
1891  }
1892 
1893  SourceLocation EndLoc = Tok.getLastLoc();
1894  Tok.setKind(tok::annot_typename);
1895  setTypeAnnotation(Tok, Ty);
1896  Tok.setAnnotationEndLoc(EndLoc);
1897  Tok.setLocation(TypenameLoc);
1898  PP.AnnotateCachedTokens(Tok);
1899  return false;
1900  }
1901 
1902  // Remembers whether the token was originally a scope annotation.
1903  bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1904 
1905  CXXScopeSpec SS;
1906  if (getLangOpts().CPlusPlus)
1907  if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1908  /*ObjectHadErrors=*/false,
1909  /*EnteringContext*/ false))
1910  return true;
1911 
1912  return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1913 }
1914 
1915 /// Try to annotate a type or scope token, having already parsed an
1916 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1917 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
1919  bool IsNewScope) {
1920  if (Tok.is(tok::identifier)) {
1921  // Determine whether the identifier is a type name.
1922  if (ParsedType Ty = Actions.getTypeName(
1923  *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1924  false, NextToken().is(tok::period), nullptr,
1925  /*IsCtorOrDtorName=*/false,
1926  /*NonTrivialTypeSourceInfo*/true,
1927  /*IsClassTemplateDeductionContext*/true)) {
1928  SourceLocation BeginLoc = Tok.getLocation();
1929  if (SS.isNotEmpty()) // it was a C++ qualified type name.
1930  BeginLoc = SS.getBeginLoc();
1931 
1932  /// An Objective-C object type followed by '<' is a specialization of
1933  /// a parameterized class type or a protocol-qualified type.
1934  if (getLangOpts().ObjC && NextToken().is(tok::less) &&
1935  (Ty.get()->isObjCObjectType() ||
1936  Ty.get()->isObjCObjectPointerType())) {
1937  // Consume the name.
1939  SourceLocation NewEndLoc;
1940  TypeResult NewType
1941  = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1942  /*consumeLastToken=*/false,
1943  NewEndLoc);
1944  if (NewType.isUsable())
1945  Ty = NewType.get();
1946  else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1947  return false;
1948  }
1949 
1950  // This is a typename. Replace the current token in-place with an
1951  // annotation type token.
1952  Tok.setKind(tok::annot_typename);
1953  setTypeAnnotation(Tok, Ty);
1954  Tok.setAnnotationEndLoc(Tok.getLocation());
1955  Tok.setLocation(BeginLoc);
1956 
1957  // In case the tokens were cached, have Preprocessor replace
1958  // them with the annotation token.
1959  PP.AnnotateCachedTokens(Tok);
1960  return false;
1961  }
1962 
1963  if (!getLangOpts().CPlusPlus) {
1964  // If we're in C, we can't have :: tokens at all (the lexer won't return
1965  // them). If the identifier is not a type, then it can't be scope either,
1966  // just early exit.
1967  return false;
1968  }
1969 
1970  // If this is a template-id, annotate with a template-id or type token.
1971  // FIXME: This appears to be dead code. We already have formed template-id
1972  // tokens when parsing the scope specifier; this can never form a new one.
1973  if (NextToken().is(tok::less)) {
1974  TemplateTy Template;
1976  TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1977  bool MemberOfUnknownSpecialization;
1978  if (TemplateNameKind TNK = Actions.isTemplateName(
1979  getCurScope(), SS,
1980  /*hasTemplateKeyword=*/false, TemplateName,
1981  /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1982  MemberOfUnknownSpecialization)) {
1983  // Only annotate an undeclared template name as a template-id if the
1984  // following tokens have the form of a template argument list.
1985  if (TNK != TNK_Undeclared_template ||
1986  isTemplateArgumentList(1) != TPResult::False) {
1987  // Consume the identifier.
1988  ConsumeToken();
1989  if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1990  TemplateName)) {
1991  // If an unrecoverable error occurred, we need to return true here,
1992  // because the token stream is in a damaged state. We may not
1993  // return a valid identifier.
1994  return true;
1995  }
1996  }
1997  }
1998  }
1999 
2000  // The current token, which is either an identifier or a
2001  // template-id, is not part of the annotation. Fall through to
2002  // push that token back into the stream and complete the C++ scope
2003  // specifier annotation.
2004  }
2005 
2006  if (Tok.is(tok::annot_template_id)) {
2007  TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2008  if (TemplateId->Kind == TNK_Type_template) {
2009  // A template-id that refers to a type was parsed into a
2010  // template-id annotation in a context where we weren't allowed
2011  // to produce a type annotation token. Update the template-id
2012  // annotation token to a type annotation token now.
2013  AnnotateTemplateIdTokenAsType(SS);
2014  return false;
2015  }
2016  }
2017 
2018  if (SS.isEmpty())
2019  return false;
2020 
2021  // A C++ scope specifier that isn't followed by a typename.
2022  AnnotateScopeToken(SS, IsNewScope);
2023  return false;
2024 }
2025 
2026 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
2027 /// annotates C++ scope specifiers and template-ids. This returns
2028 /// true if there was an error that could not be recovered from.
2029 ///
2030 /// Note that this routine emits an error if you call it with ::new or ::delete
2031 /// as the current tokens, so only call it in contexts where these are invalid.
2032 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
2033  assert(getLangOpts().CPlusPlus &&
2034  "Call sites of this function should be guarded by checking for C++");
2035  assert(MightBeCXXScopeToken() && "Cannot be a type or scope token!");
2036 
2037  CXXScopeSpec SS;
2038  if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
2039  /*ObjectHadErrors=*/false,
2040  EnteringContext))
2041  return true;
2042  if (SS.isEmpty())
2043  return false;
2044 
2045  AnnotateScopeToken(SS, true);
2046  return false;
2047 }
2048 
2049 bool Parser::isTokenEqualOrEqualTypo() {
2050  tok::TokenKind Kind = Tok.getKind();
2051  switch (Kind) {
2052  default:
2053  return false;
2054  case tok::ampequal: // &=
2055  case tok::starequal: // *=
2056  case tok::plusequal: // +=
2057  case tok::minusequal: // -=
2058  case tok::exclaimequal: // !=
2059  case tok::slashequal: // /=
2060  case tok::percentequal: // %=
2061  case tok::lessequal: // <=
2062  case tok::lesslessequal: // <<=
2063  case tok::greaterequal: // >=
2064  case tok::greatergreaterequal: // >>=
2065  case tok::caretequal: // ^=
2066  case tok::pipeequal: // |=
2067  case tok::equalequal: // ==
2068  Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
2069  << Kind
2071  LLVM_FALLTHROUGH;
2072  case tok::equal:
2073  return true;
2074  }
2075 }
2076 
2077 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
2078  assert(Tok.is(tok::code_completion));
2079  PrevTokLocation = Tok.getLocation();
2080 
2081  for (Scope *S = getCurScope(); S; S = S->getParent()) {
2082  if (S->getFlags() & Scope::FnScope) {
2085  cutOffParsing();
2086  return PrevTokLocation;
2087  }
2088 
2089  if (S->getFlags() & Scope::ClassScope) {
2091  cutOffParsing();
2092  return PrevTokLocation;
2093  }
2094  }
2095 
2097  cutOffParsing();
2098  return PrevTokLocation;
2099 }
2100 
2101 // Code-completion pass-through functions
2102 
2103 void Parser::CodeCompleteDirective(bool InConditional) {
2104  Actions.CodeCompletePreprocessorDirective(InConditional);
2105 }
2106 
2107 void Parser::CodeCompleteInConditionalExclusion() {
2109 }
2110 
2111 void Parser::CodeCompleteMacroName(bool IsDefinition) {
2112  Actions.CodeCompletePreprocessorMacroName(IsDefinition);
2113 }
2114 
2115 void Parser::CodeCompletePreprocessorExpression() {
2117 }
2118 
2119 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
2121  unsigned ArgumentIndex) {
2122  Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
2123  ArgumentIndex);
2124 }
2125 
2126 void Parser::CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {
2127  Actions.CodeCompleteIncludedFile(Dir, IsAngled);
2128 }
2129 
2130 void Parser::CodeCompleteNaturalLanguage() {
2131  Actions.CodeCompleteNaturalLanguage();
2132 }
2133 
2134 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
2135  assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
2136  "Expected '__if_exists' or '__if_not_exists'");
2137  Result.IsIfExists = Tok.is(tok::kw___if_exists);
2138  Result.KeywordLoc = ConsumeToken();
2139 
2140  BalancedDelimiterTracker T(*this, tok::l_paren);
2141  if (T.consumeOpen()) {
2142  Diag(Tok, diag::err_expected_lparen_after)
2143  << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
2144  return true;
2145  }
2146 
2147  // Parse nested-name-specifier.
2148  if (getLangOpts().CPlusPlus)
2149  ParseOptionalCXXScopeSpecifier(Result.SS, /*ObjectType=*/nullptr,
2150  /*ObjectHadErrors=*/false,
2151  /*EnteringContext=*/false);
2152 
2153  // Check nested-name specifier.
2154  if (Result.SS.isInvalid()) {
2155  T.skipToEnd();
2156  return true;
2157  }
2158 
2159  // Parse the unqualified-id.
2160  SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
2161  if (ParseUnqualifiedId(Result.SS, /*ObjectType=*/nullptr,
2162  /*ObjectHadErrors=*/false, /*EnteringContext*/ false,
2163  /*AllowDestructorName*/ true,
2164  /*AllowConstructorName*/ true,
2165  /*AllowDeductionGuide*/ false, &TemplateKWLoc,
2166  Result.Name)) {
2167  T.skipToEnd();
2168  return true;
2169  }
2170 
2171  if (T.consumeClose())
2172  return true;
2173 
2174  // Check if the symbol exists.
2175  switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
2176  Result.IsIfExists, Result.SS,
2177  Result.Name)) {
2178  case Sema::IER_Exists:
2179  Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
2180  break;
2181 
2183  Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
2184  break;
2185 
2186  case Sema::IER_Dependent:
2187  Result.Behavior = IEB_Dependent;
2188  break;
2189 
2190  case Sema::IER_Error:
2191  return true;
2192  }
2193 
2194  return false;
2195 }
2196 
2197 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2198  IfExistsCondition Result;
2199  if (ParseMicrosoftIfExistsCondition(Result))
2200  return;
2201 
2202  BalancedDelimiterTracker Braces(*this, tok::l_brace);
2203  if (Braces.consumeOpen()) {
2204  Diag(Tok, diag::err_expected) << tok::l_brace;
2205  return;
2206  }
2207 
2208  switch (Result.Behavior) {
2209  case IEB_Parse:
2210  // Parse declarations below.
2211  break;
2212 
2213  case IEB_Dependent:
2214  llvm_unreachable("Cannot have a dependent external declaration");
2215 
2216  case IEB_Skip:
2217  Braces.skipToEnd();
2218  return;
2219  }
2220 
2221  // Parse the declarations.
2222  // FIXME: Support module import within __if_exists?
2223  while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2224  ParsedAttributesWithRange attrs(AttrFactory);
2225  MaybeParseCXX11Attributes(attrs);
2226  DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2227  if (Result && !getCurScope()->getParent())
2228  Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2229  }
2230  Braces.consumeClose();
2231 }
2232 
2233 /// Parse a declaration beginning with the 'module' keyword or C++20
2234 /// context-sensitive keyword (optionally preceded by 'export').
2235 ///
2236 /// module-declaration: [Modules TS + P0629R0]
2237 /// 'export'[opt] 'module' module-name attribute-specifier-seq[opt] ';'
2238 ///
2239 /// global-module-fragment: [C++2a]
2240 /// 'module' ';' top-level-declaration-seq[opt]
2241 /// module-declaration: [C++2a]
2242 /// 'export'[opt] 'module' module-name module-partition[opt]
2243 /// attribute-specifier-seq[opt] ';'
2244 /// private-module-fragment: [C++2a]
2245 /// 'module' ':' 'private' ';' top-level-declaration-seq[opt]
2246 Parser::DeclGroupPtrTy Parser::ParseModuleDecl(bool IsFirstDecl) {
2247  SourceLocation StartLoc = Tok.getLocation();
2248 
2249  Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2252 
2253  assert(
2254  (Tok.is(tok::kw_module) ||
2255  (Tok.is(tok::identifier) && Tok.getIdentifierInfo() == Ident_module)) &&
2256  "not a module declaration");
2257  SourceLocation ModuleLoc = ConsumeToken();
2258 
2259  // Attributes appear after the module name, not before.
2260  // FIXME: Suggest moving the attributes later with a fixit.
2261  DiagnoseAndSkipCXX11Attributes();
2262 
2263  // Parse a global-module-fragment, if present.
2264  if (getLangOpts().CPlusPlusModules && Tok.is(tok::semi)) {
2265  SourceLocation SemiLoc = ConsumeToken();
2266  if (!IsFirstDecl) {
2267  Diag(StartLoc, diag::err_global_module_introducer_not_at_start)
2268  << SourceRange(StartLoc, SemiLoc);
2269  return nullptr;
2270  }
2271  if (MDK == Sema::ModuleDeclKind::Interface) {
2272  Diag(StartLoc, diag::err_module_fragment_exported)
2273  << /*global*/0 << FixItHint::CreateRemoval(StartLoc);
2274  }
2275  return Actions.ActOnGlobalModuleFragmentDecl(ModuleLoc);
2276  }
2277 
2278  // Parse a private-module-fragment, if present.
2279  if (getLangOpts().CPlusPlusModules && Tok.is(tok::colon) &&
2280  NextToken().is(tok::kw_private)) {
2281  if (MDK == Sema::ModuleDeclKind::Interface) {
2282  Diag(StartLoc, diag::err_module_fragment_exported)
2283  << /*private*/1 << FixItHint::CreateRemoval(StartLoc);
2284  }
2285  ConsumeToken();
2286  SourceLocation PrivateLoc = ConsumeToken();
2287  DiagnoseAndSkipCXX11Attributes();
2288  ExpectAndConsumeSemi(diag::err_private_module_fragment_expected_semi);
2289  return Actions.ActOnPrivateModuleFragmentDecl(ModuleLoc, PrivateLoc);
2290  }
2291 
2293  if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2294  return nullptr;
2295 
2296  // Parse the optional module-partition.
2297  if (Tok.is(tok::colon)) {
2300  if (ParseModuleName(ModuleLoc, Partition, /*IsImport*/false))
2301  return nullptr;
2302 
2303  // FIXME: Support module partition declarations.
2304  Diag(ColonLoc, diag::err_unsupported_module_partition)
2305  << SourceRange(ColonLoc, Partition.back().second);
2306  // Recover by parsing as a non-partition.
2307  }
2308 
2309  // We don't support any module attributes yet; just parse them and diagnose.
2310  ParsedAttributesWithRange Attrs(AttrFactory);
2311  MaybeParseCXX11Attributes(Attrs);
2312  ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2313 
2314  ExpectAndConsumeSemi(diag::err_module_expected_semi);
2315 
2316  return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path, IsFirstDecl);
2317 }
2318 
2319 /// Parse a module import declaration. This is essentially the same for
2320 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2321 /// and the trailing optional attributes (in C++).
2322 ///
2323 /// [ObjC] @import declaration:
2324 /// '@' 'import' module-name ';'
2325 /// [ModTS] module-import-declaration:
2326 /// 'import' module-name attribute-specifier-seq[opt] ';'
2327 /// [C++2a] module-import-declaration:
2328 /// 'export'[opt] 'import' module-name
2329 /// attribute-specifier-seq[opt] ';'
2330 /// 'export'[opt] 'import' module-partition
2331 /// attribute-specifier-seq[opt] ';'
2332 /// 'export'[opt] 'import' header-name
2333 /// attribute-specifier-seq[opt] ';'
2334 Decl *Parser::ParseModuleImport(SourceLocation AtLoc) {
2335  SourceLocation StartLoc = AtLoc.isInvalid() ? Tok.getLocation() : AtLoc;
2336 
2337  SourceLocation ExportLoc;
2338  TryConsumeToken(tok::kw_export, ExportLoc);
2339 
2340  assert((AtLoc.isInvalid() ? Tok.isOneOf(tok::kw_import, tok::identifier)
2341  : Tok.isObjCAtKeyword(tok::objc_import)) &&
2342  "Improper start to module import");
2343  bool IsObjCAtImport = Tok.isObjCAtKeyword(tok::objc_import);
2344  SourceLocation ImportLoc = ConsumeToken();
2345 
2347  Module *HeaderUnit = nullptr;
2348 
2349  if (Tok.is(tok::header_name)) {
2350  // This is a header import that the preprocessor decided we should skip
2351  // because it was malformed in some way. Parse and ignore it; it's already
2352  // been diagnosed.
2353  ConsumeToken();
2354  } else if (Tok.is(tok::annot_header_unit)) {
2355  // This is a header import that the preprocessor mapped to a module import.
2356  HeaderUnit = reinterpret_cast<Module *>(Tok.getAnnotationValue());
2357  ConsumeAnnotationToken();
2358  } else if (getLangOpts().CPlusPlusModules && Tok.is(tok::colon)) {
2360  if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2361  return nullptr;
2362 
2363  // FIXME: Support module partition import.
2364  Diag(ColonLoc, diag::err_unsupported_module_partition)
2365  << SourceRange(ColonLoc, Path.back().second);
2366  return nullptr;
2367  } else {
2368  if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2369  return nullptr;
2370  }
2371 
2372  ParsedAttributesWithRange Attrs(AttrFactory);
2373  MaybeParseCXX11Attributes(Attrs);
2374  // We don't support any module import attributes yet.
2375  ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2376 
2377  if (PP.hadModuleLoaderFatalFailure()) {
2378  // With a fatal failure in the module loader, we abort parsing.
2379  cutOffParsing();
2380  return nullptr;
2381  }
2382 
2383  DeclResult Import;
2384  if (HeaderUnit)
2385  Import =
2386  Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, HeaderUnit);
2387  else if (!Path.empty())
2388  Import = Actions.ActOnModuleImport(StartLoc, ExportLoc, ImportLoc, Path);
2389  ExpectAndConsumeSemi(diag::err_module_expected_semi);
2390  if (Import.isInvalid())
2391  return nullptr;
2392 
2393  // Using '@import' in framework headers requires modules to be enabled so that
2394  // the header is parseable. Emit a warning to make the user aware.
2395  if (IsObjCAtImport && AtLoc.isValid()) {
2396  auto &SrcMgr = PP.getSourceManager();
2397  auto *FE = SrcMgr.getFileEntryForID(SrcMgr.getFileID(AtLoc));
2398  if (FE && llvm::sys::path::parent_path(FE->getDir()->getName())
2399  .endswith(".framework"))
2400  Diags.Report(AtLoc, diag::warn_atimport_in_framework_header);
2401  }
2402 
2403  return Import.get();
2404 }
2405 
2406 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2407 /// grammar).
2408 ///
2409 /// module-name:
2410 /// module-name-qualifier[opt] identifier
2411 /// module-name-qualifier:
2412 /// module-name-qualifier[opt] identifier '.'
2413 bool Parser::ParseModuleName(
2414  SourceLocation UseLoc,
2415  SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2416  bool IsImport) {
2417  // Parse the module path.
2418  while (true) {
2419  if (!Tok.is(tok::identifier)) {
2420  if (Tok.is(tok::code_completion)) {
2421  Actions.CodeCompleteModuleImport(UseLoc, Path);
2422  cutOffParsing();
2423  return true;
2424  }
2425 
2426  Diag(Tok, diag::err_module_expected_ident) << IsImport;
2427  SkipUntil(tok::semi);
2428  return true;
2429  }
2430 
2431  // Record this part of the module path.
2432  Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2433  ConsumeToken();
2434 
2435  if (Tok.isNot(tok::period))
2436  return false;
2437 
2438  ConsumeToken();
2439  }
2440 }
2441 
2442 /// Try recover parser when module annotation appears where it must not
2443 /// be found.
2444 /// \returns false if the recover was successful and parsing may be continued, or
2445 /// true if parser must bail out to top level and handle the token there.
2446 bool Parser::parseMisplacedModuleImport() {
2447  while (true) {
2448  switch (Tok.getKind()) {
2449  case tok::annot_module_end:
2450  // If we recovered from a misplaced module begin, we expect to hit a
2451  // misplaced module end too. Stay in the current context when this
2452  // happens.
2453  if (MisplacedModuleBeginCount) {
2454  --MisplacedModuleBeginCount;
2455  Actions.ActOnModuleEnd(Tok.getLocation(),
2456  reinterpret_cast<Module *>(
2457  Tok.getAnnotationValue()));
2458  ConsumeAnnotationToken();
2459  continue;
2460  }
2461  // Inform caller that recovery failed, the error must be handled at upper
2462  // level. This will generate the desired "missing '}' at end of module"
2463  // diagnostics on the way out.
2464  return true;
2465  case tok::annot_module_begin:
2466  // Recover by entering the module (Sema will diagnose).
2467  Actions.ActOnModuleBegin(Tok.getLocation(),
2468  reinterpret_cast<Module *>(
2469  Tok.getAnnotationValue()));
2470  ConsumeAnnotationToken();
2471  ++MisplacedModuleBeginCount;
2472  continue;
2473  case tok::annot_module_include:
2474  // Module import found where it should not be, for instance, inside a
2475  // namespace. Recover by importing the module.
2476  Actions.ActOnModuleInclude(Tok.getLocation(),
2477  reinterpret_cast<Module *>(
2478  Tok.getAnnotationValue()));
2479  ConsumeAnnotationToken();
2480  // If there is another module import, process it.
2481  continue;
2482  default:
2483  return false;
2484  }
2485  }
2486  return false;
2487 }
2488 
2489 bool BalancedDelimiterTracker::diagnoseOverflow() {
2490  P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2491  << P.getLangOpts().BracketDepth;
2492  P.Diag(P.Tok, diag::note_bracket_depth);
2493  P.cutOffParsing();
2494  return true;
2495 }
2496 
2498  const char *Msg,
2499  tok::TokenKind SkipToTok) {
2500  LOpen = P.Tok.getLocation();
2501  if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2502  if (SkipToTok != tok::unknown)
2503  P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2504  return true;
2505  }
2506 
2507  if (getDepth() < P.getLangOpts().BracketDepth)
2508  return false;
2509 
2510  return diagnoseOverflow();
2511 }
2512 
2513 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2514  assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2515 
2516  if (P.Tok.is(tok::annot_module_end))
2517  P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2518  else
2519  P.Diag(P.Tok, diag::err_expected) << Close;
2520  P.Diag(LOpen, diag::note_matching) << Kind;
2521 
2522  // If we're not already at some kind of closing bracket, skip to our closing
2523  // token.
2524  if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2525  P.Tok.isNot(tok::r_square) &&
2526  P.SkipUntil(Close, FinalToken,
2528  P.Tok.is(Close))
2529  LClose = P.ConsumeAnyToken();
2530  return true;
2531 }
2532 
2534  P.SkipUntil(Close, Parser::StopBeforeMatch);
2535  consumeClose();
2536 }
The name denotes a member of a dependent type that could not be resolved.
Definition: Sema.h:2113
Defines the clang::ASTContext interface.
The name was classified as a variable template name.
Definition: Sema.h:2120
Represents a function declaration or definition.
Definition: Decl.h:1783
DeclaratorChunk::FunctionTypeInfo & getFunctionTypeInfo()
getFunctionTypeInfo - Retrieves the function type info object (looking through parentheses).
Definition: DeclSpec.h:2312
SourceLocation getLocWithOffset(int Offset) const
Return a source location with the specified offset from this SourceLocation.
PtrTy get() const
Definition: Ownership.h:80
ParseScope - Introduces a new scope for parsing.
Definition: Parser.h:1055
This is a scope that corresponds to the parameters within a function prototype.
Definition: Scope.h:81
void clear()
Reset the contents of this Declarator.
Definition: DeclSpec.h:1957
DeclResult ActOnModuleImport(SourceLocation StartLoc, SourceLocation ExportLoc, SourceLocation ImportLoc, ModuleIdPath Path)
The parser has processed a module import declaration.
Definition: SemaModule.cpp:307
void Initialize()
Perform initialization that occurs after the parser has been initialized but before it parses anythin...
Definition: Sema.cpp:221
void Initialize()
Initialize - Warm up the parser.
Definition: Parser.cpp:441
IdentifierInfo * getIdentifierInfo(StringRef Name) const
Return information about the specified preprocessor identifier token.
Code completion occurs within a class, struct, or union.
Definition: Sema.h:11897
Defines the clang::FileManager interface and associated types.
IdentifierInfo * Name
FIXME: Temporarily stores the name of a specialization.
DeclGroupPtrTy ActOnPrivateModuleFragmentDecl(SourceLocation ModuleLoc, SourceLocation PrivateLoc)
The parser has processed a private-module-fragment declaration that begins the definition of the priv...
Definition: SemaModule.cpp:246
virtual Stmt * getBody() const
getBody - If this Decl represents a declaration for a body of code, such as a function or method defi...
Definition: DeclBase.h:1006
The name was classified as an ADL-only function template name.
Definition: Sema.h:2124
SourceLocation TemplateNameLoc
TemplateNameLoc - The location of the template name within the source.
Stmt - This represents one statement.
Definition: Stmt.h:68
bool is(tok::TokenKind K) const
is/isNot - Predicates to check if this token is a specific kind, as in "if (Tok.is(tok::l_brace)) {...
Definition: Token.h:97
bool isEmpty() const
No scope specifier.
Definition: DeclSpec.h:190
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:89
bool isCodeCompletionReached() const
Returns true if code-completion is enabled and we have hit the code-completion point.
Defines the C++ template declaration subclasses.
StringRef P
void CodeCompleteNaturalLanguage()
Classification failed; an error has been produced.
Definition: Sema.h:2097
bool TryAnnotateCXXScopeToken(bool EnteringContext=false)
TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only annotates C++ scope specifiers and ...
Definition: Parser.cpp:2032
SourceLocation getCloseLocation() const
This indicates that the scope corresponds to a function, which means that labels are set here...
Definition: Scope.h:47
DiagnosticBuilder Report(SourceLocation Loc, unsigned DiagID)
Issue the message to the client.
Definition: Diagnostic.h:1330
bool isFunctionDeclarator(unsigned &idx) const
isFunctionDeclarator - This method returns true if the declarator is a function declarator (looking t...
Definition: DeclSpec.h:2281
static const char * getSpecifierName(DeclSpec::TST T, const PrintingPolicy &Policy)
Turn a type-specifier-type into a string like "_Bool" or "union".
Definition: DeclSpec.cpp:531
AccessSpecifier
A C++ access specifier (public, private, protected), plus the special value "none" which means differ...
Definition: Specifiers.h:115
TemplateNameKind Kind
The kind of template that Template refers to.
Wrapper for void* pointer.
Definition: Ownership.h:50
Parser - This implements a parser for the C family of languages.
Definition: Parser.h:61
bool ParseUnqualifiedId(CXXScopeSpec &SS, ParsedType ObjectType, bool ObjectHadErrors, bool EnteringContext, bool AllowDestructorName, bool AllowConstructorName, bool AllowDeductionGuide, SourceLocation *TemplateKWLoc, UnqualifiedId &Result)
Parse a C++ unqualified-id (or a C identifier), which describes the name of an entity.
TSCS getThreadStorageClassSpec() const
Definition: DeclSpec.h:451
NameClassificationKind getKind() const
Definition: Sema.h:2203
const ParsedAttributes & getAttributes() const
Definition: DeclSpec.h:2495
void * SaveNestedNameSpecifierAnnotation(CXXScopeSpec &SS)
Given a C++ nested-name-specifier, produce an annotation value that the parser can use later to recon...
bool isKNRPrototype() const
isKNRPrototype - Return true if this is a K&R style identifier list, like "void foo(a,b,c)".
Definition: DeclSpec.h:1410
bool hadModuleLoaderFatalFailure() const
Definition: Preprocessor.h:939
void ActOnDefaultCtorInitializers(Decl *CDtorDecl)
static const TSCS TSCS_unspecified
Definition: DeclSpec.h:247
bool MightBeCXXScopeToken()
Definition: Parser.h:840
Information about one declarator, including the parsed type information and the identifier.
Definition: DeclSpec.h:1791
unsigned getParsedSpecifiers() const
Return a bitmask of which flavors of specifiers this DeclSpec includes.
Definition: DeclSpec.cpp:447
TypeSpecifierType
Specifies the kind of type.
Definition: Specifiers.h:60
static const TST TST_interface
Definition: DeclSpec.h:298
Describes how types, statements, expressions, and declarations should be printed. ...
Definition: PrettyPrinter.h:49
Code completion occurs within an Objective-C implementation or category implementation.
Definition: Sema.h:11903
RAII object that makes sure paren/bracket/brace count is correct after declaration/statement parsing...
Decl * ActOnParamDeclarator(Scope *S, Declarator &D)
ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() to introduce parameters into fun...
Definition: SemaDecl.cpp:13358
ParsedType getTypeName(const IdentifierInfo &II, SourceLocation NameLoc, Scope *S, CXXScopeSpec *SS=nullptr, bool isClassName=false, bool HasTrailingDot=false, ParsedType ObjectType=nullptr, bool IsCtorOrDtorName=false, bool WantNontrivialTypeSourceInfo=false, bool IsClassTemplateDeductionContext=true, IdentifierInfo **CorrectedII=nullptr)
If the identifier refers to a type name within this scope, return the declaration of that type...
Definition: SemaDecl.cpp:284
bool canSkipFunctionBody(Decl *D)
Determine whether we can skip parsing the body of a function definition, assuming we don&#39;t care about...
Definition: SemaDecl.cpp:14080
bool isAnnotation() const
Return true if this is any of tok::annot_* kind tokens.
Definition: Token.h:120
friend class ObjCDeclContextSwitch
Definition: Parser.h:66
The name was classified as a non-type, and an expression representing that name has been formed...
Definition: Sema.h:2116
void MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD, CachedTokens &Toks)
tok::TokenKind getKind() const
Definition: Token.h:92
bool SkipUntil(tok::TokenKind T, SkipUntilFlags Flags=static_cast< SkipUntilFlags >(0))
SkipUntil - Read tokens until we get to the specified token, then consume it (unless StopBeforeMatch ...
Definition: Parser.h:1178
Information about a template-id annotation token.
void CodeCompleteOrdinaryName(Scope *S, ParserCompletionContext CompletionContext)
Decl * ActOnStartOfFunctionDef(Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParamLists, SkipBodyInfo *SkipBody=nullptr)
Definition: SemaDecl.cpp:13641
Represents a struct/union/class.
Definition: Decl.h:3764
const Token & NextToken()
NextToken - This peeks ahead one token and returns it without consuming it.
Definition: Parser.h:786
SourceLocation getLocForEndOfToken(SourceLocation Loc, unsigned Offset=0)
Computes the source location just past the end of the token at this source location.
bool TryConsumeToken(tok::TokenKind Expected)
Definition: Parser.h:483
void SetPoisonReason(IdentifierInfo *II, unsigned DiagID)
Specifies the reason for poisoning an identifier.
One of these records is kept for each identifier that is lexed.
Lookup for the name failed, but we&#39;re assuming it was a template name anyway.
Definition: TemplateKinds.h:50
SourceLocation getTypeSpecTypeLoc() const
Definition: DeclSpec.h:520
Base class for callback objects used by Sema::CorrectTypo to check the validity of a potential typo c...
static const TST TST_class
Definition: DeclSpec.h:299
DeclGroupPtrTy ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType=nullptr)
Definition: SemaDecl.cpp:56
SourceLocation getMaxTokensOverrideLoc() const
void ActOnEndOfTranslationUnit()
ActOnEndOfTranslationUnit - This is called at the very end of the translation unit when EOF is reache...
Definition: Sema.cpp:978
Token - This structure provides full information about a lexed token.
Definition: Token.h:34
static const TST TST_enum
Definition: DeclSpec.h:295
void CodeCompletePreprocessorMacroArgument(Scope *S, IdentifierInfo *Macro, MacroInfo *MacroInfo, unsigned Argument)
TemplateName getTemplateName() const
Definition: Sema.h:2220
void setKind(tok::TokenKind K)
Definition: Token.h:93
RAII class that helps handle the parsing of an open/close delimiter pair, such as braces { ...
void removeCommentHandler(CommentHandler *Handler)
Remove the specified comment handler.
bool hasTagDefinition() const
Definition: DeclSpec.cpp:438
void ClearStorageClassSpecs()
Definition: DeclSpec.h:464
Describes a module or submodule.
Definition: Module.h:87
The name was classified as a type.
Definition: Sema.h:2101
Code completion occurs at top-level or namespace context.
Definition: Sema.h:11895
static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R)
Definition: Parser.cpp:234
The name was classified as a template whose specializations are types.
Definition: Sema.h:2118
bool isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const
Return true if we have an ObjC keyword identifier.
Definition: Lexer.cpp:58
Code completion occurs within the body of a function on a recovery path, where we do not have a speci...
Definition: Sema.h:11927
Represents a C++ unqualified-id that has been parsed.
Definition: DeclSpec.h:955
PtrTy get() const
Definition: Ownership.h:170
StringRef getSpelling(SourceLocation loc, SmallVectorImpl< char > &buffer, bool *invalid=nullptr) const
Return the &#39;spelling&#39; of the token at the given location; does not go up to the spelling location or ...
tok::TokenKind getTokenID() const
If this is a source-language token (e.g.
void SetRangeBegin(SourceLocation Loc)
SetRangeBegin - Set the start of the source range to Loc, unless it&#39;s invalid.
Definition: DeclSpec.h:1936
DeclGroupPtrTy BuildDeclaratorGroup(MutableArrayRef< Decl *> Group)
BuildDeclaratorGroup - convert a list of declarations into a declaration group, performing any necess...
Definition: SemaDecl.cpp:13242
ExprResult getExpression() const
Definition: Sema.h:2205
const clang::PrintingPolicy & getPrintingPolicy() const
Definition: ASTContext.h:611
void CodeCompleteModuleImport(SourceLocation ImportLoc, ModuleIdPath Path)
The name has been typo-corrected to a keyword.
Definition: Sema.h:2099
SourceRange getAnnotationRange() const
SourceRange of the group of tokens that this annotation token represents.
Definition: Token.h:160
ParsedTemplateArgument * getTemplateArgs()
Retrieves a pointer to the template arguments.
MutableArrayRef< TemplateParameterList * > MultiTemplateParamsArg
Definition: Ownership.h:277
IfExistsResult CheckMicrosoftIfExistsSymbol(Scope *S, CXXScopeSpec &SS, const DeclarationNameInfo &TargetNameInfo)
const ParsingDeclSpec & getDeclSpec() const
void ActOnModuleInclude(SourceLocation DirectiveLoc, Module *Mod)
The parser has processed a module import translated from a #include or similar preprocessing directiv...
Definition: SemaModule.cpp:404
Scope - A scope is a transient data structure that is used while parsing the program.
Definition: Scope.h:40
Decl * ActOnFileScopeAsmDecl(Expr *expr, SourceLocation AsmLoc, SourceLocation RParenLoc)
Definition: SemaDecl.cpp:18107
Represents a C++ nested-name-specifier or a global scope specifier.
Definition: DeclSpec.h:64
void CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled)
void setCodeCompletionHandler(CodeCompletionHandler &Handler)
Set the code completion handler to the given object.
SourceLocation ConsumeAnyToken(bool ConsumeCodeCompletionTok=false)
ConsumeAnyToken - Dispatch to the right Consume* method based on the current token type...
Definition: Parser.h:503
Decl * ActOnFinishFunctionBody(Decl *Decl, Stmt *Body)
Definition: SemaDecl.cpp:14108
bool isUnevaluatedContext() const
Determines whether we are currently in a context that is not evaluated as per C++ [expr] p5...
Definition: Sema.h:8730
SourceRange getSourceRange() const LLVM_READONLY
Definition: DeclSpec.h:512
IdentifierInfo * getIdentifier() const
Definition: DeclSpec.h:2171
SourceLocation TemplateKWLoc
TemplateKWLoc - The location of the template keyword.
SourceLocation LAngleLoc
The location of the &#39;<&#39; before the template argument list.
An error occurred.
Definition: Sema.h:5240
Sema - This implements semantic analysis and AST building for C.
Definition: Sema.h:340
A little helper class used to produce diagnostics.
Definition: Diagnostic.h:1062
A class for parsing a declarator.
unsigned getTokenCount() const
Get the number of tokens processed so far.
void clearCodeCompletionHandler()
Clear out the code completion handler.
The name was classified as a function template name.
Definition: Sema.h:2122
unsigned NumParams
NumParams - This is the number of formal parameters specified by the declarator.
Definition: DeclSpec.h:1309
Stop at code completion.
Definition: Parser.h:1160
SourceRange getRange() const
Definition: DeclSpec.h:69
void setAnnotationRange(SourceRange R)
Definition: Token.h:163
TST getTypeSpecType() const
Definition: DeclSpec.h:482
static bool isDeclRep(TST T)
Definition: DeclSpec.h:428
void setAnnotationValue(void *val)
Definition: Token.h:230
bool isCodeCompletionEnabled() const
Determine if we are performing code completion.
void CodeCompleteObjCMethodDecl(Scope *S, Optional< bool > IsInstanceMethod, ParsedType ReturnType)
Decl * ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, DeclSpec &DS, RecordDecl *&AnonRecord)
ParsedFreeStandingDeclSpec - This method is invoked when a declspec with no declarator (e...
Definition: SemaDecl.cpp:4339
ModuleDeclKind
Definition: Sema.h:2576
int Id
Definition: ASTDiff.cpp:191
void AnnotateCachedTokens(const Token &Tok)
We notify the Preprocessor that if it is caching tokens (because backtrack is enabled) it should repl...
const FileEntry * getFileEntryForID(FileID FID) const
Returns the FileEntry record for the provided FileID.
This file defines the classes used to store parsed information about declaration-specifiers and decla...
void SkipMalformedDecl()
SkipMalformedDecl - Read tokens until we get to some likely good stopping point for skipping past a s...
Definition: ParseDecl.cpp:1774
The name was classified as a specific non-type, non-template declaration.
Definition: Sema.h:2105
void RevertCachedTokens(unsigned N)
When backtracking is enabled and tokens are cached, this allows to revert a specific number of tokens...
SourceLocation getThreadStorageClassSpecLoc() const
Definition: DeclSpec.h:460
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file. ...
Definition: Token.h:126
SourceLocation getBeginLoc() const
Definition: DeclSpec.h:73
Decl * ActOnEmptyDeclaration(Scope *S, const ParsedAttributesView &AttrList, SourceLocation SemiLoc)
Handle a C++11 empty-declaration and attribute-declaration.
Represents a C++ template name within the type system.
Definition: TemplateName.h:192
This is a compound statement scope.
Definition: Scope.h:130
void CodeCompletePreprocessorExpression()
SourceLocation getStorageClassSpecLoc() const
Definition: DeclSpec.h:459
const char * getPunctuatorSpelling(TokenKind Kind) LLVM_READNONE
Determines the spelling of simple punctuation tokens like &#39;!&#39; or &#39;&#39;, and returns NULL for literal and...
Definition: TokenKinds.cpp:31
NamedDecl * getNonTypeDecl() const
Definition: Sema.h:2215
TemplateNameKind
Specifies the kind of template name that an identifier refers to.
Definition: TemplateKinds.h:20
static const TST TST_int
Definition: DeclSpec.h:280
void SetDeclDeleted(Decl *dcl, SourceLocation DelLoc)
bool isInvalid() const
Definition: Ownership.h:166
SourceLocation getEnd() const
ExprResult ParseStringLiteralExpression(bool AllowUserDefinedLiteral=false)
Wraps an identifier and optional source location for the identifier.
Definition: ParsedAttr.h:174
The symbol exists.
Definition: Sema.h:5230
bool isUsable() const
Definition: Ownership.h:167
The result type of a method or function.
const LangOptions & getLangOpts() const
Definition: Parser.h:430
TemplateNameKind isTemplateName(Scope *S, CXXScopeSpec &SS, bool hasTemplateKeyword, const UnqualifiedId &Name, ParsedType ObjectType, bool EnteringContext, TemplateTy &Template, bool &MemberOfUnknownSpecialization, bool Disambiguation=false)
This is a scope that corresponds to the parameters within a function prototype for a function declara...
Definition: Scope.h:87
SourceManager & getSourceManager() const
Definition: Preprocessor.h:919
NameClassification ClassifyName(Scope *S, CXXScopeSpec &SS, IdentifierInfo *&Name, SourceLocation NameLoc, const Token &NextToken, CorrectionCandidateCallback *CCC=nullptr)
Perform name lookup on the given name, classifying it based on the results of name lookup and the fol...
Definition: SemaDecl.cpp:854
void CheckForFunctionRedefinition(FunctionDecl *FD, const FunctionDecl *EffectiveDefinition=nullptr, SkipBodyInfo *SkipBody=nullptr)
Definition: SemaDecl.cpp:13732
Decl * ActOnSkippedFunctionBody(Decl *Decl)
Definition: SemaDecl.cpp:14098
A class for parsing a DeclSpec.
void ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, SourceLocation LocAfterDecls)
Definition: SemaDecl.cpp:13604
#define false
Definition: stdbool.h:17
Kind
Stop skipping at semicolon.
Definition: Parser.h:1157
ActionResult - This structure is used while parsing/acting on expressions, stmts, etc...
Definition: Ownership.h:153
void TypoCorrectToken(const Token &Tok)
Update the current token to represent the provided identifier, in order to cache an action performed ...
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
SCS getStorageClassSpec() const
Definition: DeclSpec.h:450
bool ParseTopLevelDecl()
Definition: Parser.h:465
ASTContext & getASTContext() const
Definition: Sema.h:1437
Encodes a location in the source.
IdentifierInfo & get(StringRef Name)
Return the identifier token info for the specified named identifier.
void setCurrentOpenCLExtensionForDecl(Decl *FD)
Set current OpenCL extensions for a declaration which can only be used when these OpenCL extensions a...
Definition: Sema.cpp:2389
bool TryAnnotateTypeOrScopeToken()
TryAnnotateTypeOrScopeToken - If the current token position is on a typename (possibly qualified in C...
Definition: Parser.cpp:1803
void ExitScope()
ExitScope - Pop a scope off the scope stack.
Definition: Parser.cpp:382
static const TST TST_union
Definition: DeclSpec.h:296
IdentifierInfo * getIdentifierInfo() const
Definition: Token.h:179
Parser(Preprocessor &PP, Sema &Actions, bool SkipFunctionBodies)
Definition: Parser.cpp:51
void setAnnotationEndLoc(SourceLocation L)
Definition: Token.h:144
IdentifierTable & getIdentifierTable()
Definition: Preprocessor.h:922
ParsedAttr - Represents a syntactic attribute.
Definition: ParsedAttr.h:196
ParsedType getType() const
Definition: Sema.h:2210
void setIdentifierInfo(IdentifierInfo *II)
Definition: Token.h:188
ExtensionRAIIObject - This saves the state of extension warnings when constructed and disables them...
void SetDeclDefaulted(Decl *dcl, SourceLocation DefaultLoc)
bool canDelayFunctionBody(const Declarator &D)
Determine whether we can delay parsing the body of a function or function template until it is used...
Definition: SemaDecl.cpp:14056
void CodeCompletePreprocessorDirective(bool InConditional)
void Lex(Token &Result)
Lex the next token for this preprocessor.
TemplateNameKind getTemplateNameKind() const
Definition: Sema.h:2227
void EnterScope(unsigned ScopeFlags)
EnterScope - Start a new scope.
Definition: Parser.cpp:371
This name is not a type or template in this context, but might be something else. ...
Definition: Sema.h:2095
DeclGroupPtrTy ActOnGlobalModuleFragmentDecl(SourceLocation ModuleLoc)
The parser has processed a global-module-fragment declaration that begins the definition of the globa...
Definition: SemaModule.cpp:58
bool isAtStartOfLine() const
isAtStartOfLine - Return true if this token is at the start of a line.
Definition: Token.h:268
TokenKind
Provides a simple uniform namespace for tokens from all C languages.
Definition: TokenKinds.h:25
bool isObjCObjectPointerType() const
Definition: Type.h:6772
static bool IsCommonTypo(tok::TokenKind ExpectedTok, const Token &Tok)
Definition: Parser.cpp:102
void SetLateTemplateParser(LateTemplateParserCB *LTP, LateTemplateParserCleanupCB *LTPCleanup, void *P)
Definition: Sema.h:802
void EnterToken(const Token &Tok, bool IsReinject)
Enters a token in the token stream to be lexed next.
unsigned getMaxTokens() const
Get the max number of tokens before issuing a -Wmax-tokens warning.
Scope * getCurScope() const
Definition: Parser.h:437
The name is a dependent name, so the results will differ from one instantiation to the next...
Definition: Sema.h:5237
void Init(Scope *parent, unsigned flags)
Init - This is used by the parser to implement scope caching.
Definition: Scope.cpp:87
void ActOnStartOfTranslationUnit()
This is called before the very first declaration in the translation unit is parsed.
Definition: Sema.cpp:898
ASTConsumer & getASTConsumer() const
Definition: Sema.h:1438
bool isInvalid() const
An error occurred during parsing of the scope specifier.
Definition: DeclSpec.h:195
void CodeCompletePreprocessorMacroName(bool IsDefinition)
void setFunctionDefinitionKind(FunctionDefinitionKind Val)
Definition: DeclSpec.h:2544
Describes a module import declaration, which makes the contents of the named module visible in the cu...
Definition: Decl.h:4352
The scope of a struct/union/class definition.
Definition: Scope.h:65
bool isNot(tok::TokenKind K) const
Definition: Token.h:98
bool isBacktrackEnabled() const
True if EnableBacktrackAtThisPos() was called and caching of tokens is on.
Dataflow Directional Tag Classes.
bool isValid() const
Return true if this is a valid SourceLocation object.
&#39;export module X;&#39;
bool expectAndConsume(unsigned DiagID=diag::err_expected, const char *Msg="", tok::TokenKind SkipToTok=tok::unknown)
Definition: Parser.cpp:2497
const Scope * getParent() const
getParent - Return the scope that this is nested in.
Definition: Scope.h:228
void addCommentHandler(CommentHandler *Handler)
Add the specified comment handler to the preprocessor.
SourceLocation RAngleLoc
The location of the &#39;>&#39; after the template argument list.
void ActOnModuleBegin(SourceLocation DirectiveLoc, Module *Mod)
The parsed has entered a submodule.
Definition: SemaModule.cpp:438
static FixItHint CreateRemoval(CharSourceRange RemoveRange)
Create a code modification hint that removes the given source range.
Definition: Diagnostic.h:122
bool mightBeType() const
Determine whether this might be a type template.
bool isOneOf(tok::TokenKind K1, tok::TokenKind K2) const
Definition: Token.h:99
SkipUntilFlags
Control flags for SkipUntil functions.
Definition: Parser.h:1156
TypeResult ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, const CXXScopeSpec &SS, const IdentifierInfo &II, SourceLocation IdLoc)
Called when the parser has parsed a C++ typename specifier, e.g., "typename T::type".
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1017
The name refers to a template whose specialization produces a type.
Definition: TemplateKinds.h:30
static const TST TST_unspecified
Definition: DeclSpec.h:273
Encapsulates the data about a macro definition (e.g.
Definition: MacroInfo.h:39
~Parser() override
Definition: Parser.cpp:421
void takeAttributesFrom(ParsedAttributes &attrs)
Definition: DeclSpec.h:803
DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID)
Definition: Parser.cpp:73
The name was classified as an ADL-only function name.
Definition: Sema.h:2109
DeclGroupPtrTy ActOnModuleDecl(SourceLocation StartLoc, SourceLocation ModuleLoc, ModuleDeclKind MDK, ModuleIdPath Path, bool IsFirstDecl)
The parser has processed a module-declaration that begins the definition of a module interface or imp...
Definition: SemaModule.cpp:91
static FixItHint CreateInsertion(SourceLocation InsertionLoc, StringRef Code, bool BeforePreviousInsertions=false)
Create a code modification hint that inserts the given code string at a specific location.
Definition: Diagnostic.h:96
SmallVector< TemplateParameterList *, 4 > TemplateParameterLists
Definition: Parser.h:449
This is a scope that can contain a declaration.
Definition: Scope.h:59
bool isObjCObjectType() const
Definition: Type.h:6776
bool SetTypeSpecType(TST T, SourceLocation Loc, const char *&PrevSpec, unsigned &DiagID, const PrintingPolicy &Policy)
Definition: DeclSpec.cpp:809
NamedDecl * HandleDeclarator(Scope *S, Declarator &D, MultiTemplateParamsArg TemplateParameterLists)
Definition: SemaDecl.cpp:5684
SourceLocation getIdentifierLoc() const
Definition: DeclSpec.h:2177
void ActOnTranslationUnitScope(Scope *S)
Definition: Sema.cpp:89
The name was classified as a concept name.
Definition: Sema.h:2126
ParsingDeclSpec & getMutableDeclSpec() const
Captures information about "declaration specifiers".
Definition: DeclSpec.h:229
SourceLocation ConsumeToken()
ConsumeToken - Consume the current &#39;peek token&#39; and lex the next one.
Definition: Parser.h:475
TypeResult TypeError()
Definition: Ownership.h:281
SourceLocation getLastLoc() const
Definition: Token.h:149
bool isNotEmpty() const
A scope specifier is present, but may be valid or invalid.
Definition: DeclSpec.h:192
DeclContext * CurContext
CurContext - This is the current declaration context of parsing.
Definition: Sema.h:411
void ActOnPopScope(SourceLocation Loc, Scope *S)
Scope actions.
Definition: SemaDecl.cpp:1911
static FixItHint CreateReplacement(CharSourceRange RemoveRange, StringRef Code)
Create a code modification hint that replaces the given source range with the given code string...
Definition: Diagnostic.h:133
void revertTokenIDToIdentifier()
Revert TokenID to tok::identifier; used for GNU libstdc++ 4.2 compatibility.
bool isIncrementalProcessingEnabled() const
Returns true if incremental processing is enabled.
ExprResult ExprError()
Definition: Ownership.h:279
bool TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS, bool IsNewScope)
Try to annotate a type or scope token, having already parsed an optional scope specifier.
Definition: Parser.cpp:1918
static Decl::Kind getKind(const Decl *D)
Definition: DeclBase.cpp:994
void ActOnComment(SourceRange Comment)
Definition: Sema.cpp:2054
Abstract base class that describes a handler that will receive source ranges for each of the comments...
static OpaquePtr make(TemplateName P)
Definition: Ownership.h:60
bool isEmpty() const
isEmpty - Return true if this declaration specifier is completely empty: no tokens were parsed in the...
Definition: DeclSpec.h:640
virtual bool HandleTopLevelDecl(DeclGroupRef D)
HandleTopLevelDecl - Handle the specified top-level declaration.
Definition: ASTConsumer.cpp:18
static const TST TST_struct
Definition: DeclSpec.h:297
void setLocation(SourceLocation L)
Definition: Token.h:134
void ActOnModuleEnd(SourceLocation DirectiveLoc, Module *Mod)
The parser has left a submodule.
Definition: SemaModule.cpp:462
#define true
Definition: stdbool.h:16
A trivial tuple used to represent a source range.
void setIdentifier(const IdentifierInfo *Id, SourceLocation IdLoc)
Specify that this unqualified-id was parsed as an identifier.
Definition: DeclSpec.h:1044
bool isTranslationUnit() const
Definition: DeclBase.h:1887
bool isEditorPlaceholder() const
Returns true if this token is an editor placeholder.
Definition: Token.h:310
unsigned NumArgs
NumArgs - The number of template arguments.
void * getAnnotationValue() const
Definition: Token.h:226
SourceLocation getBegin() const
SourceLocation ColonLoc
Location of &#39;:&#39;.
void setCommaLoc(SourceLocation CL)
Definition: DeclSpec.h:2538
DiagnosticBuilder Diag(SourceLocation Loc, unsigned DiagID) const
Forwarding function for diagnostics.
The symbol does not exist.
Definition: Sema.h:5233
void CodeCompleteInPreprocessorConditionalExclusion(Scope *S)
ParamInfo * Params
Params - This is a pointer to a new[]&#39;d array of ParamInfo objects that describe the parameters speci...
Definition: DeclSpec.h:1334
ParsedAttributes & getAttributes()
Definition: DeclSpec.h:800
void startToken()
Reset all flags to cleared.
Definition: Token.h:171
ParsedTemplateTy Template
The declaration of the template corresponding to the template-name.
bool ParseFirstTopLevelDecl(DeclGroupPtrTy &Result)
Parse the first top-level declaration in a translation unit.
Definition: Parser.cpp:548
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:128
Stop skipping at specified token, but don&#39;t skip the token itself.
Definition: Parser.h:1159