1 //===--- Parser.cpp - C Language Family Parser ----------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Parser interfaces.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "clang/Parse/Parser.h"
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/DeclTemplate.h"
18 #include "clang/Parse/ParseDiagnostic.h"
19 #include "clang/Parse/RAIIObjectsForParser.h"
20 #include "clang/Sema/DeclSpec.h"
21 #include "clang/Sema/ParsedTemplate.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:
ActionCommentHandler(Sema & S)34 explicit ActionCommentHandler(Sema &S) : S(S) { }
35
HandleComment(Preprocessor & PP,SourceRange Comment)36 bool HandleComment(Preprocessor &PP, SourceRange Comment) override {
37 S.ActOnComment(Comment);
38 return false;
39 }
40 };
41 } // end anonymous namespace
42
getSEHExceptKeyword()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
Parser(Preprocessor & pp,Sema & actions,bool skipFunctionBodies)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
Diag(SourceLocation Loc,unsigned DiagID)73 DiagnosticBuilder Parser::Diag(SourceLocation Loc, unsigned DiagID) {
74 return Diags.Report(Loc, DiagID);
75 }
76
Diag(const Token & Tok,unsigned DiagID)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.
SuggestParentheses(SourceLocation Loc,unsigned DK,SourceRange ParenRange)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
IsCommonTypo(tok::TokenKind ExpectedTok,const Token & Tok)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
ExpectAndConsume(tok::TokenKind ExpectedTok,unsigned DiagID,StringRef Msg)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);
122 DB << FixItHint::CreateReplacement(
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
ExpectAndConsumeSemi(unsigned DiagID)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)
169 << FixItHint::CreateRemoval(Tok.getLocation());
170 ConsumeAnyToken(); // The ')' or ']'.
171 ConsumeToken(); // The ';'.
172 return false;
173 }
174
175 return ExpectAndConsume(tok::semi, DiagID);
176 }
177
ConsumeExtraSemi(ExtraSemiKind Kind,unsigned TST)178 void Parser::ConsumeExtraSemi(ExtraSemiKind Kind, unsigned 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((DeclSpec::TST)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
expectIdentifier()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
HasFlagsSet(Parser::SkipUntilFlags L,Parser::SkipUntilFlags R)234 static bool HasFlagsSet(Parser::SkipUntilFlags L, Parser::SkipUntilFlags R) {
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.
SkipUntil(ArrayRef<tok::TokenKind> Toks,SkipUntilFlags Flags)246 bool Parser::SkipUntil(ArrayRef<tok::TokenKind> Toks, SkipUntilFlags Flags) {
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) &&
268 !HasFlagsSet(Flags, StopAtCodeCompletion)) {
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 case tok::annot_module_begin:
283 case tok::annot_module_end:
284 case tok::annot_module_include:
285 // Stop before we change submodules. They generally indicate a "good"
286 // place to pick up parsing again (except in the special case where
287 // we're trying to skip to EOF).
288 return false;
289
290 case tok::code_completion:
291 if (!HasFlagsSet(Flags, StopAtCodeCompletion))
292 handleUnexpectedCodeCompletionToken();
293 return false;
294
295 case tok::l_paren:
296 // Recursively skip properly-nested parens.
297 ConsumeParen();
298 if (HasFlagsSet(Flags, StopAtCodeCompletion))
299 SkipUntil(tok::r_paren, StopAtCodeCompletion);
300 else
301 SkipUntil(tok::r_paren);
302 break;
303 case tok::l_square:
304 // Recursively skip properly-nested square brackets.
305 ConsumeBracket();
306 if (HasFlagsSet(Flags, StopAtCodeCompletion))
307 SkipUntil(tok::r_square, StopAtCodeCompletion);
308 else
309 SkipUntil(tok::r_square);
310 break;
311 case tok::l_brace:
312 // Recursively skip properly-nested braces.
313 ConsumeBrace();
314 if (HasFlagsSet(Flags, StopAtCodeCompletion))
315 SkipUntil(tok::r_brace, StopAtCodeCompletion);
316 else
317 SkipUntil(tok::r_brace);
318 break;
319
320 // Okay, we found a ']' or '}' or ')', which we think should be balanced.
321 // Since the user wasn't looking for this token (if they were, it would
322 // already be handled), this isn't balanced. If there is a LHS token at a
323 // higher level, we will assume that this matches the unbalanced token
324 // and return it. Otherwise, this is a spurious RHS token, which we skip.
325 case tok::r_paren:
326 if (ParenCount && !isFirstTokenSkipped)
327 return false; // Matches something.
328 ConsumeParen();
329 break;
330 case tok::r_square:
331 if (BracketCount && !isFirstTokenSkipped)
332 return false; // Matches something.
333 ConsumeBracket();
334 break;
335 case tok::r_brace:
336 if (BraceCount && !isFirstTokenSkipped)
337 return false; // Matches something.
338 ConsumeBrace();
339 break;
340
341 case tok::semi:
342 if (HasFlagsSet(Flags, StopAtSemi))
343 return false;
344 LLVM_FALLTHROUGH;
345 default:
346 // Skip this token.
347 ConsumeAnyToken();
348 break;
349 }
350 isFirstTokenSkipped = false;
351 }
352 }
353
354 //===----------------------------------------------------------------------===//
355 // Scope manipulation
356 //===----------------------------------------------------------------------===//
357
358 /// EnterScope - Start a new scope.
EnterScope(unsigned ScopeFlags)359 void Parser::EnterScope(unsigned ScopeFlags) {
360 if (NumCachedScopes) {
361 Scope *N = ScopeCache[--NumCachedScopes];
362 N->Init(getCurScope(), ScopeFlags);
363 Actions.CurScope = N;
364 } else {
365 Actions.CurScope = new Scope(getCurScope(), ScopeFlags, Diags);
366 }
367 }
368
369 /// ExitScope - Pop a scope off the scope stack.
ExitScope()370 void Parser::ExitScope() {
371 assert(getCurScope() && "Scope imbalance!");
372
373 // Inform the actions module that this scope is going away if there are any
374 // decls in it.
375 Actions.ActOnPopScope(Tok.getLocation(), getCurScope());
376
377 Scope *OldScope = getCurScope();
378 Actions.CurScope = OldScope->getParent();
379
380 if (NumCachedScopes == ScopeCacheSize)
381 delete OldScope;
382 else
383 ScopeCache[NumCachedScopes++] = OldScope;
384 }
385
386 /// Set the flags for the current scope to ScopeFlags. If ManageFlags is false,
387 /// this object does nothing.
ParseScopeFlags(Parser * Self,unsigned ScopeFlags,bool ManageFlags)388 Parser::ParseScopeFlags::ParseScopeFlags(Parser *Self, unsigned ScopeFlags,
389 bool ManageFlags)
390 : CurScope(ManageFlags ? Self->getCurScope() : nullptr) {
391 if (CurScope) {
392 OldFlags = CurScope->getFlags();
393 CurScope->setFlags(ScopeFlags);
394 }
395 }
396
397 /// Restore the flags for the current scope to what they were before this
398 /// object overrode them.
~ParseScopeFlags()399 Parser::ParseScopeFlags::~ParseScopeFlags() {
400 if (CurScope)
401 CurScope->setFlags(OldFlags);
402 }
403
404
405 //===----------------------------------------------------------------------===//
406 // C99 6.9: External Definitions.
407 //===----------------------------------------------------------------------===//
408
~Parser()409 Parser::~Parser() {
410 // If we still have scopes active, delete the scope tree.
411 delete getCurScope();
412 Actions.CurScope = nullptr;
413
414 // Free the scope cache.
415 for (unsigned i = 0, e = NumCachedScopes; i != e; ++i)
416 delete ScopeCache[i];
417
418 resetPragmaHandlers();
419
420 PP.removeCommentHandler(CommentSemaHandler.get());
421
422 PP.clearCodeCompletionHandler();
423
424 if (getLangOpts().DelayedTemplateParsing &&
425 !PP.isIncrementalProcessingEnabled() && !TemplateIds.empty()) {
426 // If an ASTConsumer parsed delay-parsed templates in their
427 // HandleTranslationUnit() method, TemplateIds created there were not
428 // guarded by a DestroyTemplateIdAnnotationsRAIIObj object in
429 // ParseTopLevelDecl(). Destroy them here.
430 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
431 }
432
433 assert(TemplateIds.empty() && "Still alive TemplateIdAnnotations around?");
434 }
435
436 /// Initialize - Warm up the parser.
437 ///
Initialize()438 void Parser::Initialize() {
439 // Create the translation unit scope. Install it as the current scope.
440 assert(getCurScope() == nullptr && "A scope is already active?");
441 EnterScope(Scope::DeclScope);
442 Actions.ActOnTranslationUnitScope(getCurScope());
443
444 // Initialization for Objective-C context sensitive keywords recognition.
445 // Referenced in Parser::ParseObjCTypeQualifierList.
446 if (getLangOpts().ObjC) {
447 ObjCTypeQuals[objc_in] = &PP.getIdentifierTable().get("in");
448 ObjCTypeQuals[objc_out] = &PP.getIdentifierTable().get("out");
449 ObjCTypeQuals[objc_inout] = &PP.getIdentifierTable().get("inout");
450 ObjCTypeQuals[objc_oneway] = &PP.getIdentifierTable().get("oneway");
451 ObjCTypeQuals[objc_bycopy] = &PP.getIdentifierTable().get("bycopy");
452 ObjCTypeQuals[objc_byref] = &PP.getIdentifierTable().get("byref");
453 ObjCTypeQuals[objc_nonnull] = &PP.getIdentifierTable().get("nonnull");
454 ObjCTypeQuals[objc_nullable] = &PP.getIdentifierTable().get("nullable");
455 ObjCTypeQuals[objc_null_unspecified]
456 = &PP.getIdentifierTable().get("null_unspecified");
457 }
458
459 Ident_instancetype = nullptr;
460 Ident_final = nullptr;
461 Ident_sealed = nullptr;
462 Ident_override = nullptr;
463 Ident_GNU_final = nullptr;
464
465 Ident_super = &PP.getIdentifierTable().get("super");
466
467 Ident_vector = nullptr;
468 Ident_bool = nullptr;
469 Ident_pixel = nullptr;
470 if (getLangOpts().AltiVec || getLangOpts().ZVector) {
471 Ident_vector = &PP.getIdentifierTable().get("vector");
472 Ident_bool = &PP.getIdentifierTable().get("bool");
473 }
474 if (getLangOpts().AltiVec)
475 Ident_pixel = &PP.getIdentifierTable().get("pixel");
476
477 Ident_introduced = nullptr;
478 Ident_deprecated = nullptr;
479 Ident_obsoleted = nullptr;
480 Ident_unavailable = nullptr;
481 Ident_strict = nullptr;
482 Ident_replacement = nullptr;
483
484 Ident_language = Ident_defined_in = Ident_generated_declaration = nullptr;
485
486 Ident__except = nullptr;
487
488 Ident__exception_code = Ident__exception_info = nullptr;
489 Ident__abnormal_termination = Ident___exception_code = nullptr;
490 Ident___exception_info = Ident___abnormal_termination = nullptr;
491 Ident_GetExceptionCode = Ident_GetExceptionInfo = nullptr;
492 Ident_AbnormalTermination = nullptr;
493
494 if(getLangOpts().Borland) {
495 Ident__exception_info = PP.getIdentifierInfo("_exception_info");
496 Ident___exception_info = PP.getIdentifierInfo("__exception_info");
497 Ident_GetExceptionInfo = PP.getIdentifierInfo("GetExceptionInformation");
498 Ident__exception_code = PP.getIdentifierInfo("_exception_code");
499 Ident___exception_code = PP.getIdentifierInfo("__exception_code");
500 Ident_GetExceptionCode = PP.getIdentifierInfo("GetExceptionCode");
501 Ident__abnormal_termination = PP.getIdentifierInfo("_abnormal_termination");
502 Ident___abnormal_termination = PP.getIdentifierInfo("__abnormal_termination");
503 Ident_AbnormalTermination = PP.getIdentifierInfo("AbnormalTermination");
504
505 PP.SetPoisonReason(Ident__exception_code,diag::err_seh___except_block);
506 PP.SetPoisonReason(Ident___exception_code,diag::err_seh___except_block);
507 PP.SetPoisonReason(Ident_GetExceptionCode,diag::err_seh___except_block);
508 PP.SetPoisonReason(Ident__exception_info,diag::err_seh___except_filter);
509 PP.SetPoisonReason(Ident___exception_info,diag::err_seh___except_filter);
510 PP.SetPoisonReason(Ident_GetExceptionInfo,diag::err_seh___except_filter);
511 PP.SetPoisonReason(Ident__abnormal_termination,diag::err_seh___finally_block);
512 PP.SetPoisonReason(Ident___abnormal_termination,diag::err_seh___finally_block);
513 PP.SetPoisonReason(Ident_AbnormalTermination,diag::err_seh___finally_block);
514 }
515
516 Actions.Initialize();
517
518 // Prime the lexer look-ahead.
519 ConsumeToken();
520 }
521
LateTemplateParserCleanupCallback(void * P)522 void Parser::LateTemplateParserCleanupCallback(void *P) {
523 // While this RAII helper doesn't bracket any actual work, the destructor will
524 // clean up annotations that were created during ActOnEndOfTranslationUnit
525 // when incremental processing is enabled.
526 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(((Parser *)P)->TemplateIds);
527 }
528
ParseFirstTopLevelDecl(DeclGroupPtrTy & Result)529 bool Parser::ParseFirstTopLevelDecl(DeclGroupPtrTy &Result) {
530 Actions.ActOnStartOfTranslationUnit();
531
532 // C11 6.9p1 says translation units must have at least one top-level
533 // declaration. C++ doesn't have this restriction. We also don't want to
534 // complain if we have a precompiled header, although technically if the PCH
535 // is empty we should still emit the (pedantic) diagnostic.
536 bool NoTopLevelDecls = ParseTopLevelDecl(Result);
537 if (NoTopLevelDecls && !Actions.getASTContext().getExternalSource() &&
538 !getLangOpts().CPlusPlus)
539 Diag(diag::ext_empty_translation_unit);
540
541 return NoTopLevelDecls;
542 }
543
544 /// ParseTopLevelDecl - Parse one top-level declaration, return whatever the
545 /// action tells us to. This returns true if the EOF was encountered.
ParseTopLevelDecl(DeclGroupPtrTy & Result)546 bool Parser::ParseTopLevelDecl(DeclGroupPtrTy &Result) {
547 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
548
549 // Skip over the EOF token, flagging end of previous input for incremental
550 // processing
551 if (PP.isIncrementalProcessingEnabled() && Tok.is(tok::eof))
552 ConsumeToken();
553
554 Result = nullptr;
555 switch (Tok.getKind()) {
556 case tok::annot_pragma_unused:
557 HandlePragmaUnused();
558 return false;
559
560 case tok::kw_export:
561 if (NextToken().isNot(tok::kw_module))
562 break;
563 LLVM_FALLTHROUGH;
564 case tok::kw_module:
565 Result = ParseModuleDecl();
566 return false;
567
568 case tok::annot_module_include:
569 Actions.ActOnModuleInclude(Tok.getLocation(),
570 reinterpret_cast<Module *>(
571 Tok.getAnnotationValue()));
572 ConsumeAnnotationToken();
573 return false;
574
575 case tok::annot_module_begin:
576 Actions.ActOnModuleBegin(Tok.getLocation(), reinterpret_cast<Module *>(
577 Tok.getAnnotationValue()));
578 ConsumeAnnotationToken();
579 return false;
580
581 case tok::annot_module_end:
582 Actions.ActOnModuleEnd(Tok.getLocation(), reinterpret_cast<Module *>(
583 Tok.getAnnotationValue()));
584 ConsumeAnnotationToken();
585 return false;
586
587 case tok::annot_pragma_attribute:
588 HandlePragmaAttribute();
589 return false;
590
591 case tok::eof:
592 // Late template parsing can begin.
593 if (getLangOpts().DelayedTemplateParsing)
594 Actions.SetLateTemplateParser(LateTemplateParserCallback,
595 PP.isIncrementalProcessingEnabled() ?
596 LateTemplateParserCleanupCallback : nullptr,
597 this);
598 if (!PP.isIncrementalProcessingEnabled())
599 Actions.ActOnEndOfTranslationUnit();
600 //else don't tell Sema that we ended parsing: more input might come.
601 return true;
602
603 default:
604 break;
605 }
606
607 ParsedAttributesWithRange attrs(AttrFactory);
608 MaybeParseCXX11Attributes(attrs);
609
610 Result = ParseExternalDeclaration(attrs);
611 return false;
612 }
613
614 /// ParseExternalDeclaration:
615 ///
616 /// external-declaration: [C99 6.9], declaration: [C++ dcl.dcl]
617 /// function-definition
618 /// declaration
619 /// [GNU] asm-definition
620 /// [GNU] __extension__ external-declaration
621 /// [OBJC] objc-class-definition
622 /// [OBJC] objc-class-declaration
623 /// [OBJC] objc-alias-declaration
624 /// [OBJC] objc-protocol-definition
625 /// [OBJC] objc-method-definition
626 /// [OBJC] @end
627 /// [C++] linkage-specification
628 /// [GNU] asm-definition:
629 /// simple-asm-expr ';'
630 /// [C++11] empty-declaration
631 /// [C++11] attribute-declaration
632 ///
633 /// [C++11] empty-declaration:
634 /// ';'
635 ///
636 /// [C++0x/GNU] 'extern' 'template' declaration
637 ///
638 /// [Modules-TS] module-import-declaration
639 ///
640 Parser::DeclGroupPtrTy
ParseExternalDeclaration(ParsedAttributesWithRange & attrs,ParsingDeclSpec * DS)641 Parser::ParseExternalDeclaration(ParsedAttributesWithRange &attrs,
642 ParsingDeclSpec *DS) {
643 DestroyTemplateIdAnnotationsRAIIObj CleanupRAII(TemplateIds);
644 ParenBraceBracketBalancer BalancerRAIIObj(*this);
645
646 if (PP.isCodeCompletionReached()) {
647 cutOffParsing();
648 return nullptr;
649 }
650
651 Decl *SingleDecl = nullptr;
652 switch (Tok.getKind()) {
653 case tok::annot_pragma_vis:
654 HandlePragmaVisibility();
655 return nullptr;
656 case tok::annot_pragma_pack:
657 HandlePragmaPack();
658 return nullptr;
659 case tok::annot_pragma_msstruct:
660 HandlePragmaMSStruct();
661 return nullptr;
662 case tok::annot_pragma_align:
663 HandlePragmaAlign();
664 return nullptr;
665 case tok::annot_pragma_weak:
666 HandlePragmaWeak();
667 return nullptr;
668 case tok::annot_pragma_weakalias:
669 HandlePragmaWeakAlias();
670 return nullptr;
671 case tok::annot_pragma_redefine_extname:
672 HandlePragmaRedefineExtname();
673 return nullptr;
674 case tok::annot_pragma_fp_contract:
675 HandlePragmaFPContract();
676 return nullptr;
677 case tok::annot_pragma_fenv_access:
678 HandlePragmaFEnvAccess();
679 return nullptr;
680 case tok::annot_pragma_fp:
681 HandlePragmaFP();
682 break;
683 case tok::annot_pragma_opencl_extension:
684 HandlePragmaOpenCLExtension();
685 return nullptr;
686 case tok::annot_pragma_openmp: {
687 AccessSpecifier AS = AS_none;
688 return ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, attrs);
689 }
690 case tok::annot_pragma_ms_pointers_to_members:
691 HandlePragmaMSPointersToMembers();
692 return nullptr;
693 case tok::annot_pragma_ms_vtordisp:
694 HandlePragmaMSVtorDisp();
695 return nullptr;
696 case tok::annot_pragma_ms_pragma:
697 HandlePragmaMSPragma();
698 return nullptr;
699 case tok::annot_pragma_dump:
700 HandlePragmaDump();
701 return nullptr;
702 case tok::semi:
703 // Either a C++11 empty-declaration or attribute-declaration.
704 SingleDecl =
705 Actions.ActOnEmptyDeclaration(getCurScope(), attrs, Tok.getLocation());
706 ConsumeExtraSemi(OutsideFunction);
707 break;
708 case tok::r_brace:
709 Diag(Tok, diag::err_extraneous_closing_brace);
710 ConsumeBrace();
711 return nullptr;
712 case tok::eof:
713 Diag(Tok, diag::err_expected_external_declaration);
714 return nullptr;
715 case tok::kw___extension__: {
716 // __extension__ silences extension warnings in the subexpression.
717 ExtensionRAIIObject O(Diags); // Use RAII to do this.
718 ConsumeToken();
719 return ParseExternalDeclaration(attrs);
720 }
721 case tok::kw_asm: {
722 ProhibitAttributes(attrs);
723
724 SourceLocation StartLoc = Tok.getLocation();
725 SourceLocation EndLoc;
726
727 ExprResult Result(ParseSimpleAsm(&EndLoc));
728
729 // Check if GNU-style InlineAsm is disabled.
730 // Empty asm string is allowed because it will not introduce
731 // any assembly code.
732 if (!(getLangOpts().GNUAsm || Result.isInvalid())) {
733 const auto *SL = cast<StringLiteral>(Result.get());
734 if (!SL->getString().trim().empty())
735 Diag(StartLoc, diag::err_gnu_inline_asm_disabled);
736 }
737
738 ExpectAndConsume(tok::semi, diag::err_expected_after,
739 "top-level asm block");
740
741 if (Result.isInvalid())
742 return nullptr;
743 SingleDecl = Actions.ActOnFileScopeAsmDecl(Result.get(), StartLoc, EndLoc);
744 break;
745 }
746 case tok::at:
747 return ParseObjCAtDirectives(attrs);
748 case tok::minus:
749 case tok::plus:
750 if (!getLangOpts().ObjC) {
751 Diag(Tok, diag::err_expected_external_declaration);
752 ConsumeToken();
753 return nullptr;
754 }
755 SingleDecl = ParseObjCMethodDefinition();
756 break;
757 case tok::code_completion:
758 if (CurParsedObjCImpl) {
759 // Code-complete Objective-C methods even without leading '-'/'+' prefix.
760 Actions.CodeCompleteObjCMethodDecl(getCurScope(),
761 /*IsInstanceMethod=*/None,
762 /*ReturnType=*/nullptr);
763 }
764 Actions.CodeCompleteOrdinaryName(
765 getCurScope(),
766 CurParsedObjCImpl ? Sema::PCC_ObjCImplementation : Sema::PCC_Namespace);
767 cutOffParsing();
768 return nullptr;
769 case tok::kw_import:
770 SingleDecl = ParseModuleImport(SourceLocation());
771 break;
772 case tok::kw_export:
773 if (getLangOpts().ModulesTS) {
774 SingleDecl = ParseExportDeclaration();
775 break;
776 }
777 // This must be 'export template'. Parse it so we can diagnose our lack
778 // of support.
779 LLVM_FALLTHROUGH;
780 case tok::kw_using:
781 case tok::kw_namespace:
782 case tok::kw_typedef:
783 case tok::kw_template:
784 case tok::kw_static_assert:
785 case tok::kw__Static_assert:
786 // A function definition cannot start with any of these keywords.
787 {
788 SourceLocation DeclEnd;
789 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
790 }
791
792 case tok::kw_static:
793 // Parse (then ignore) 'static' prior to a template instantiation. This is
794 // a GCC extension that we intentionally do not support.
795 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
796 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
797 << 0;
798 SourceLocation DeclEnd;
799 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
800 }
801 goto dont_know;
802
803 case tok::kw_inline:
804 if (getLangOpts().CPlusPlus) {
805 tok::TokenKind NextKind = NextToken().getKind();
806
807 // Inline namespaces. Allowed as an extension even in C++03.
808 if (NextKind == tok::kw_namespace) {
809 SourceLocation DeclEnd;
810 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
811 }
812
813 // Parse (then ignore) 'inline' prior to a template instantiation. This is
814 // a GCC extension that we intentionally do not support.
815 if (NextKind == tok::kw_template) {
816 Diag(ConsumeToken(), diag::warn_static_inline_explicit_inst_ignored)
817 << 1;
818 SourceLocation DeclEnd;
819 return ParseDeclaration(DeclaratorContext::FileContext, DeclEnd, attrs);
820 }
821 }
822 goto dont_know;
823
824 case tok::kw_extern:
825 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_template)) {
826 // Extern templates
827 SourceLocation ExternLoc = ConsumeToken();
828 SourceLocation TemplateLoc = ConsumeToken();
829 Diag(ExternLoc, getLangOpts().CPlusPlus11 ?
830 diag::warn_cxx98_compat_extern_template :
831 diag::ext_extern_template) << SourceRange(ExternLoc, TemplateLoc);
832 SourceLocation DeclEnd;
833 return Actions.ConvertDeclToDeclGroup(
834 ParseExplicitInstantiation(DeclaratorContext::FileContext, ExternLoc,
835 TemplateLoc, DeclEnd, attrs));
836 }
837 goto dont_know;
838
839 case tok::kw___if_exists:
840 case tok::kw___if_not_exists:
841 ParseMicrosoftIfExistsExternalDeclaration();
842 return nullptr;
843
844 case tok::kw_module:
845 Diag(Tok, diag::err_unexpected_module_decl);
846 SkipUntil(tok::semi);
847 return nullptr;
848
849 default:
850 dont_know:
851 if (Tok.isEditorPlaceholder()) {
852 ConsumeToken();
853 return nullptr;
854 }
855 // We can't tell whether this is a function-definition or declaration yet.
856 return ParseDeclarationOrFunctionDefinition(attrs, DS);
857 }
858
859 // This routine returns a DeclGroup, if the thing we parsed only contains a
860 // single decl, convert it now.
861 return Actions.ConvertDeclToDeclGroup(SingleDecl);
862 }
863
864 /// Determine whether the current token, if it occurs after a
865 /// declarator, continues a declaration or declaration list.
isDeclarationAfterDeclarator()866 bool Parser::isDeclarationAfterDeclarator() {
867 // Check for '= delete' or '= default'
868 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
869 const Token &KW = NextToken();
870 if (KW.is(tok::kw_default) || KW.is(tok::kw_delete))
871 return false;
872 }
873
874 return Tok.is(tok::equal) || // int X()= -> not a function def
875 Tok.is(tok::comma) || // int X(), -> not a function def
876 Tok.is(tok::semi) || // int X(); -> not a function def
877 Tok.is(tok::kw_asm) || // int X() __asm__ -> not a function def
878 Tok.is(tok::kw___attribute) || // int X() __attr__ -> not a function def
879 (getLangOpts().CPlusPlus &&
880 Tok.is(tok::l_paren)); // int X(0) -> not a function def [C++]
881 }
882
883 /// Determine whether the current token, if it occurs after a
884 /// declarator, indicates the start of a function definition.
isStartOfFunctionDefinition(const ParsingDeclarator & Declarator)885 bool Parser::isStartOfFunctionDefinition(const ParsingDeclarator &Declarator) {
886 assert(Declarator.isFunctionDeclarator() && "Isn't a function declarator");
887 if (Tok.is(tok::l_brace)) // int X() {}
888 return true;
889
890 // Handle K&R C argument lists: int X(f) int f; {}
891 if (!getLangOpts().CPlusPlus &&
892 Declarator.getFunctionTypeInfo().isKNRPrototype())
893 return isDeclarationSpecifier();
894
895 if (getLangOpts().CPlusPlus && Tok.is(tok::equal)) {
896 const Token &KW = NextToken();
897 return KW.is(tok::kw_default) || KW.is(tok::kw_delete);
898 }
899
900 return Tok.is(tok::colon) || // X() : Base() {} (used for ctors)
901 Tok.is(tok::kw_try); // X() try { ... }
902 }
903
904 /// Parse either a function-definition or a declaration. We can't tell which
905 /// we have until we read up to the compound-statement in function-definition.
906 /// TemplateParams, if non-NULL, provides the template parameters when we're
907 /// parsing a C++ template-declaration.
908 ///
909 /// function-definition: [C99 6.9.1]
910 /// decl-specs declarator declaration-list[opt] compound-statement
911 /// [C90] function-definition: [C99 6.7.1] - implicit int result
912 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
913 ///
914 /// declaration: [C99 6.7]
915 /// declaration-specifiers init-declarator-list[opt] ';'
916 /// [!C99] init-declarator-list ';' [TODO: warn in c99 mode]
917 /// [OMP] threadprivate-directive [TODO]
918 ///
919 Parser::DeclGroupPtrTy
ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange & attrs,ParsingDeclSpec & DS,AccessSpecifier AS)920 Parser::ParseDeclOrFunctionDefInternal(ParsedAttributesWithRange &attrs,
921 ParsingDeclSpec &DS,
922 AccessSpecifier AS) {
923 MaybeParseMicrosoftAttributes(DS.getAttributes());
924 // Parse the common declaration-specifiers piece.
925 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS,
926 DeclSpecContext::DSC_top_level);
927
928 // If we had a free-standing type definition with a missing semicolon, we
929 // may get this far before the problem becomes obvious.
930 if (DS.hasTagDefinition() && DiagnoseMissingSemiAfterTagDefinition(
931 DS, AS, DeclSpecContext::DSC_top_level))
932 return nullptr;
933
934 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
935 // declaration-specifiers init-declarator-list[opt] ';'
936 if (Tok.is(tok::semi)) {
937 auto LengthOfTSTToken = [](DeclSpec::TST TKind) {
938 assert(DeclSpec::isDeclRep(TKind));
939 switch(TKind) {
940 case DeclSpec::TST_class:
941 return 5;
942 case DeclSpec::TST_struct:
943 return 6;
944 case DeclSpec::TST_union:
945 return 5;
946 case DeclSpec::TST_enum:
947 return 4;
948 case DeclSpec::TST_interface:
949 return 9;
950 default:
951 llvm_unreachable("we only expect to get the length of the class/struct/union/enum");
952 }
953
954 };
955 // Suggest correct location to fix '[[attrib]] struct' to 'struct [[attrib]]'
956 SourceLocation CorrectLocationForAttributes =
957 DeclSpec::isDeclRep(DS.getTypeSpecType())
958 ? DS.getTypeSpecTypeLoc().getLocWithOffset(
959 LengthOfTSTToken(DS.getTypeSpecType()))
960 : SourceLocation();
961 ProhibitAttributes(attrs, CorrectLocationForAttributes);
962 ConsumeToken();
963 RecordDecl *AnonRecord = nullptr;
964 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
965 DS, AnonRecord);
966 DS.complete(TheDecl);
967 if (getLangOpts().OpenCL)
968 Actions.setCurrentOpenCLExtensionForDecl(TheDecl);
969 if (AnonRecord) {
970 Decl* decls[] = {AnonRecord, TheDecl};
971 return Actions.BuildDeclaratorGroup(decls);
972 }
973 return Actions.ConvertDeclToDeclGroup(TheDecl);
974 }
975
976 DS.takeAttributesFrom(attrs);
977
978 // ObjC2 allows prefix attributes on class interfaces and protocols.
979 // FIXME: This still needs better diagnostics. We should only accept
980 // attributes here, no types, etc.
981 if (getLangOpts().ObjC && Tok.is(tok::at)) {
982 SourceLocation AtLoc = ConsumeToken(); // the "@"
983 if (!Tok.isObjCAtKeyword(tok::objc_interface) &&
984 !Tok.isObjCAtKeyword(tok::objc_protocol)) {
985 Diag(Tok, diag::err_objc_unexpected_attr);
986 SkipUntil(tok::semi); // FIXME: better skip?
987 return nullptr;
988 }
989
990 DS.abort();
991
992 const char *PrevSpec = nullptr;
993 unsigned DiagID;
994 if (DS.SetTypeSpecType(DeclSpec::TST_unspecified, AtLoc, PrevSpec, DiagID,
995 Actions.getASTContext().getPrintingPolicy()))
996 Diag(AtLoc, DiagID) << PrevSpec;
997
998 if (Tok.isObjCAtKeyword(tok::objc_protocol))
999 return ParseObjCAtProtocolDeclaration(AtLoc, DS.getAttributes());
1000
1001 return Actions.ConvertDeclToDeclGroup(
1002 ParseObjCAtInterfaceDeclaration(AtLoc, DS.getAttributes()));
1003 }
1004
1005 // If the declspec consisted only of 'extern' and we have a string
1006 // literal following it, this must be a C++ linkage specifier like
1007 // 'extern "C"'.
1008 if (getLangOpts().CPlusPlus && isTokenStringLiteral() &&
1009 DS.getStorageClassSpec() == DeclSpec::SCS_extern &&
1010 DS.getParsedSpecifiers() == DeclSpec::PQ_StorageClassSpecifier) {
1011 Decl *TheDecl = ParseLinkage(DS, DeclaratorContext::FileContext);
1012 return Actions.ConvertDeclToDeclGroup(TheDecl);
1013 }
1014
1015 return ParseDeclGroup(DS, DeclaratorContext::FileContext);
1016 }
1017
1018 Parser::DeclGroupPtrTy
ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange & attrs,ParsingDeclSpec * DS,AccessSpecifier AS)1019 Parser::ParseDeclarationOrFunctionDefinition(ParsedAttributesWithRange &attrs,
1020 ParsingDeclSpec *DS,
1021 AccessSpecifier AS) {
1022 if (DS) {
1023 return ParseDeclOrFunctionDefInternal(attrs, *DS, AS);
1024 } else {
1025 ParsingDeclSpec PDS(*this);
1026 // Must temporarily exit the objective-c container scope for
1027 // parsing c constructs and re-enter objc container scope
1028 // afterwards.
1029 ObjCDeclContextSwitch ObjCDC(*this);
1030
1031 return ParseDeclOrFunctionDefInternal(attrs, PDS, AS);
1032 }
1033 }
1034
1035 /// ParseFunctionDefinition - We parsed and verified that the specified
1036 /// Declarator is well formed. If this is a K&R-style function, read the
1037 /// parameters declaration-list, then start the compound-statement.
1038 ///
1039 /// function-definition: [C99 6.9.1]
1040 /// decl-specs declarator declaration-list[opt] compound-statement
1041 /// [C90] function-definition: [C99 6.7.1] - implicit int result
1042 /// [C90] decl-specs[opt] declarator declaration-list[opt] compound-statement
1043 /// [C++] function-definition: [C++ 8.4]
1044 /// decl-specifier-seq[opt] declarator ctor-initializer[opt]
1045 /// function-body
1046 /// [C++] function-definition: [C++ 8.4]
1047 /// decl-specifier-seq[opt] declarator function-try-block
1048 ///
ParseFunctionDefinition(ParsingDeclarator & D,const ParsedTemplateInfo & TemplateInfo,LateParsedAttrList * LateParsedAttrs)1049 Decl *Parser::ParseFunctionDefinition(ParsingDeclarator &D,
1050 const ParsedTemplateInfo &TemplateInfo,
1051 LateParsedAttrList *LateParsedAttrs) {
1052 // Poison SEH identifiers so they are flagged as illegal in function bodies.
1053 PoisonSEHIdentifiersRAIIObject PoisonSEHIdentifiers(*this, true);
1054 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1055
1056 // If this is C90 and the declspecs were completely missing, fudge in an
1057 // implicit int. We do this here because this is the only place where
1058 // declaration-specifiers are completely optional in the grammar.
1059 if (getLangOpts().ImplicitInt && D.getDeclSpec().isEmpty()) {
1060 const char *PrevSpec;
1061 unsigned DiagID;
1062 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
1063 D.getMutableDeclSpec().SetTypeSpecType(DeclSpec::TST_int,
1064 D.getIdentifierLoc(),
1065 PrevSpec, DiagID,
1066 Policy);
1067 D.SetRangeBegin(D.getDeclSpec().getSourceRange().getBegin());
1068 }
1069
1070 // If this declaration was formed with a K&R-style identifier list for the
1071 // arguments, parse declarations for all of the args next.
1072 // int foo(a,b) int a; float b; {}
1073 if (FTI.isKNRPrototype())
1074 ParseKNRParamDeclarations(D);
1075
1076 // We should have either an opening brace or, in a C++ constructor,
1077 // we may have a colon.
1078 if (Tok.isNot(tok::l_brace) &&
1079 (!getLangOpts().CPlusPlus ||
1080 (Tok.isNot(tok::colon) && Tok.isNot(tok::kw_try) &&
1081 Tok.isNot(tok::equal)))) {
1082 Diag(Tok, diag::err_expected_fn_body);
1083
1084 // Skip over garbage, until we get to '{'. Don't eat the '{'.
1085 SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch);
1086
1087 // If we didn't find the '{', bail out.
1088 if (Tok.isNot(tok::l_brace))
1089 return nullptr;
1090 }
1091
1092 // Check to make sure that any normal attributes are allowed to be on
1093 // a definition. Late parsed attributes are checked at the end.
1094 if (Tok.isNot(tok::equal)) {
1095 for (const ParsedAttr &AL : D.getAttributes())
1096 if (AL.isKnownToGCC() && !AL.isCXX11Attribute())
1097 Diag(AL.getLoc(), diag::warn_attribute_on_function_definition)
1098 << AL.getName();
1099 }
1100
1101 // In delayed template parsing mode, for function template we consume the
1102 // tokens and store them for late parsing at the end of the translation unit.
1103 if (getLangOpts().DelayedTemplateParsing && Tok.isNot(tok::equal) &&
1104 TemplateInfo.Kind == ParsedTemplateInfo::Template &&
1105 Actions.canDelayFunctionBody(D)) {
1106 MultiTemplateParamsArg TemplateParameterLists(*TemplateInfo.TemplateParams);
1107
1108 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1109 Scope::CompoundStmtScope);
1110 Scope *ParentScope = getCurScope()->getParent();
1111
1112 D.setFunctionDefinitionKind(FDK_Definition);
1113 Decl *DP = Actions.HandleDeclarator(ParentScope, D,
1114 TemplateParameterLists);
1115 D.complete(DP);
1116 D.getMutableDeclSpec().abort();
1117
1118 if (SkipFunctionBodies && (!DP || Actions.canSkipFunctionBody(DP)) &&
1119 trySkippingFunctionBody()) {
1120 BodyScope.Exit();
1121 return Actions.ActOnSkippedFunctionBody(DP);
1122 }
1123
1124 CachedTokens Toks;
1125 LexTemplateFunctionForLateParsing(Toks);
1126
1127 if (DP) {
1128 FunctionDecl *FnD = DP->getAsFunction();
1129 Actions.CheckForFunctionRedefinition(FnD);
1130 Actions.MarkAsLateParsedTemplate(FnD, DP, Toks);
1131 }
1132 return DP;
1133 }
1134 else if (CurParsedObjCImpl &&
1135 !TemplateInfo.TemplateParams &&
1136 (Tok.is(tok::l_brace) || Tok.is(tok::kw_try) ||
1137 Tok.is(tok::colon)) &&
1138 Actions.CurContext->isTranslationUnit()) {
1139 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1140 Scope::CompoundStmtScope);
1141 Scope *ParentScope = getCurScope()->getParent();
1142
1143 D.setFunctionDefinitionKind(FDK_Definition);
1144 Decl *FuncDecl = Actions.HandleDeclarator(ParentScope, D,
1145 MultiTemplateParamsArg());
1146 D.complete(FuncDecl);
1147 D.getMutableDeclSpec().abort();
1148 if (FuncDecl) {
1149 // Consume the tokens and store them for later parsing.
1150 StashAwayMethodOrFunctionBodyTokens(FuncDecl);
1151 CurParsedObjCImpl->HasCFunction = true;
1152 return FuncDecl;
1153 }
1154 // FIXME: Should we really fall through here?
1155 }
1156
1157 // Enter a scope for the function body.
1158 ParseScope BodyScope(this, Scope::FnScope | Scope::DeclScope |
1159 Scope::CompoundStmtScope);
1160
1161 // Tell the actions module that we have entered a function definition with the
1162 // specified Declarator for the function.
1163 Sema::SkipBodyInfo SkipBody;
1164 Decl *Res = Actions.ActOnStartOfFunctionDef(getCurScope(), D,
1165 TemplateInfo.TemplateParams
1166 ? *TemplateInfo.TemplateParams
1167 : MultiTemplateParamsArg(),
1168 &SkipBody);
1169
1170 if (SkipBody.ShouldSkip) {
1171 SkipFunctionBody();
1172 return Res;
1173 }
1174
1175 // Break out of the ParsingDeclarator context before we parse the body.
1176 D.complete(Res);
1177
1178 // Break out of the ParsingDeclSpec context, too. This const_cast is
1179 // safe because we're always the sole owner.
1180 D.getMutableDeclSpec().abort();
1181
1182 if (TryConsumeToken(tok::equal)) {
1183 assert(getLangOpts().CPlusPlus && "Only C++ function definitions have '='");
1184
1185 bool Delete = false;
1186 SourceLocation KWLoc;
1187 if (TryConsumeToken(tok::kw_delete, KWLoc)) {
1188 Diag(KWLoc, getLangOpts().CPlusPlus11
1189 ? diag::warn_cxx98_compat_defaulted_deleted_function
1190 : diag::ext_defaulted_deleted_function)
1191 << 1 /* deleted */;
1192 Actions.SetDeclDeleted(Res, KWLoc);
1193 Delete = true;
1194 } else if (TryConsumeToken(tok::kw_default, KWLoc)) {
1195 Diag(KWLoc, getLangOpts().CPlusPlus11
1196 ? diag::warn_cxx98_compat_defaulted_deleted_function
1197 : diag::ext_defaulted_deleted_function)
1198 << 0 /* defaulted */;
1199 Actions.SetDeclDefaulted(Res, KWLoc);
1200 } else {
1201 llvm_unreachable("function definition after = not 'delete' or 'default'");
1202 }
1203
1204 if (Tok.is(tok::comma)) {
1205 Diag(KWLoc, diag::err_default_delete_in_multiple_declaration)
1206 << Delete;
1207 SkipUntil(tok::semi);
1208 } else if (ExpectAndConsume(tok::semi, diag::err_expected_after,
1209 Delete ? "delete" : "default")) {
1210 SkipUntil(tok::semi);
1211 }
1212
1213 Stmt *GeneratedBody = Res ? Res->getBody() : nullptr;
1214 Actions.ActOnFinishFunctionBody(Res, GeneratedBody, false);
1215 return Res;
1216 }
1217
1218 if (SkipFunctionBodies && (!Res || Actions.canSkipFunctionBody(Res)) &&
1219 trySkippingFunctionBody()) {
1220 BodyScope.Exit();
1221 Actions.ActOnSkippedFunctionBody(Res);
1222 return Actions.ActOnFinishFunctionBody(Res, nullptr, false);
1223 }
1224
1225 if (Tok.is(tok::kw_try))
1226 return ParseFunctionTryBlock(Res, BodyScope);
1227
1228 // If we have a colon, then we're probably parsing a C++
1229 // ctor-initializer.
1230 if (Tok.is(tok::colon)) {
1231 ParseConstructorInitializer(Res);
1232
1233 // Recover from error.
1234 if (!Tok.is(tok::l_brace)) {
1235 BodyScope.Exit();
1236 Actions.ActOnFinishFunctionBody(Res, nullptr);
1237 return Res;
1238 }
1239 } else
1240 Actions.ActOnDefaultCtorInitializers(Res);
1241
1242 // Late attributes are parsed in the same scope as the function body.
1243 if (LateParsedAttrs)
1244 ParseLexedAttributeList(*LateParsedAttrs, Res, false, true);
1245
1246 return ParseFunctionStatementBody(Res, BodyScope);
1247 }
1248
SkipFunctionBody()1249 void Parser::SkipFunctionBody() {
1250 if (Tok.is(tok::equal)) {
1251 SkipUntil(tok::semi);
1252 return;
1253 }
1254
1255 bool IsFunctionTryBlock = Tok.is(tok::kw_try);
1256 if (IsFunctionTryBlock)
1257 ConsumeToken();
1258
1259 CachedTokens Skipped;
1260 if (ConsumeAndStoreFunctionPrologue(Skipped))
1261 SkipMalformedDecl();
1262 else {
1263 SkipUntil(tok::r_brace);
1264 while (IsFunctionTryBlock && Tok.is(tok::kw_catch)) {
1265 SkipUntil(tok::l_brace);
1266 SkipUntil(tok::r_brace);
1267 }
1268 }
1269 }
1270
1271 /// ParseKNRParamDeclarations - Parse 'declaration-list[opt]' which provides
1272 /// types for a function with a K&R-style identifier list for arguments.
ParseKNRParamDeclarations(Declarator & D)1273 void Parser::ParseKNRParamDeclarations(Declarator &D) {
1274 // We know that the top-level of this declarator is a function.
1275 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo();
1276
1277 // Enter function-declaration scope, limiting any declarators to the
1278 // function prototype scope, including parameter declarators.
1279 ParseScope PrototypeScope(this, Scope::FunctionPrototypeScope |
1280 Scope::FunctionDeclarationScope | Scope::DeclScope);
1281
1282 // Read all the argument declarations.
1283 while (isDeclarationSpecifier()) {
1284 SourceLocation DSStart = Tok.getLocation();
1285
1286 // Parse the common declaration-specifiers piece.
1287 DeclSpec DS(AttrFactory);
1288 ParseDeclarationSpecifiers(DS);
1289
1290 // C99 6.9.1p6: 'each declaration in the declaration list shall have at
1291 // least one declarator'.
1292 // NOTE: GCC just makes this an ext-warn. It's not clear what it does with
1293 // the declarations though. It's trivial to ignore them, really hard to do
1294 // anything else with them.
1295 if (TryConsumeToken(tok::semi)) {
1296 Diag(DSStart, diag::err_declaration_does_not_declare_param);
1297 continue;
1298 }
1299
1300 // C99 6.9.1p6: Declarations shall contain no storage-class specifiers other
1301 // than register.
1302 if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified &&
1303 DS.getStorageClassSpec() != DeclSpec::SCS_register) {
1304 Diag(DS.getStorageClassSpecLoc(),
1305 diag::err_invalid_storage_class_in_func_decl);
1306 DS.ClearStorageClassSpecs();
1307 }
1308 if (DS.getThreadStorageClassSpec() != DeclSpec::TSCS_unspecified) {
1309 Diag(DS.getThreadStorageClassSpecLoc(),
1310 diag::err_invalid_storage_class_in_func_decl);
1311 DS.ClearStorageClassSpecs();
1312 }
1313
1314 // Parse the first declarator attached to this declspec.
1315 Declarator ParmDeclarator(DS, DeclaratorContext::KNRTypeListContext);
1316 ParseDeclarator(ParmDeclarator);
1317
1318 // Handle the full declarator list.
1319 while (1) {
1320 // If attributes are present, parse them.
1321 MaybeParseGNUAttributes(ParmDeclarator);
1322
1323 // Ask the actions module to compute the type for this declarator.
1324 Decl *Param =
1325 Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
1326
1327 if (Param &&
1328 // A missing identifier has already been diagnosed.
1329 ParmDeclarator.getIdentifier()) {
1330
1331 // Scan the argument list looking for the correct param to apply this
1332 // type.
1333 for (unsigned i = 0; ; ++i) {
1334 // C99 6.9.1p6: those declarators shall declare only identifiers from
1335 // the identifier list.
1336 if (i == FTI.NumParams) {
1337 Diag(ParmDeclarator.getIdentifierLoc(), diag::err_no_matching_param)
1338 << ParmDeclarator.getIdentifier();
1339 break;
1340 }
1341
1342 if (FTI.Params[i].Ident == ParmDeclarator.getIdentifier()) {
1343 // Reject redefinitions of parameters.
1344 if (FTI.Params[i].Param) {
1345 Diag(ParmDeclarator.getIdentifierLoc(),
1346 diag::err_param_redefinition)
1347 << ParmDeclarator.getIdentifier();
1348 } else {
1349 FTI.Params[i].Param = Param;
1350 }
1351 break;
1352 }
1353 }
1354 }
1355
1356 // If we don't have a comma, it is either the end of the list (a ';') or
1357 // an error, bail out.
1358 if (Tok.isNot(tok::comma))
1359 break;
1360
1361 ParmDeclarator.clear();
1362
1363 // Consume the comma.
1364 ParmDeclarator.setCommaLoc(ConsumeToken());
1365
1366 // Parse the next declarator.
1367 ParseDeclarator(ParmDeclarator);
1368 }
1369
1370 // Consume ';' and continue parsing.
1371 if (!ExpectAndConsumeSemi(diag::err_expected_semi_declaration))
1372 continue;
1373
1374 // Otherwise recover by skipping to next semi or mandatory function body.
1375 if (SkipUntil(tok::l_brace, StopAtSemi | StopBeforeMatch))
1376 break;
1377 TryConsumeToken(tok::semi);
1378 }
1379
1380 // The actions module must verify that all arguments were declared.
1381 Actions.ActOnFinishKNRParamDeclarations(getCurScope(), D, Tok.getLocation());
1382 }
1383
1384
1385 /// ParseAsmStringLiteral - This is just a normal string-literal, but is not
1386 /// allowed to be a wide string, and is not subject to character translation.
1387 ///
1388 /// [GNU] asm-string-literal:
1389 /// string-literal
1390 ///
ParseAsmStringLiteral()1391 ExprResult Parser::ParseAsmStringLiteral() {
1392 if (!isTokenStringLiteral()) {
1393 Diag(Tok, diag::err_expected_string_literal)
1394 << /*Source='in...'*/0 << "'asm'";
1395 return ExprError();
1396 }
1397
1398 ExprResult AsmString(ParseStringLiteralExpression());
1399 if (!AsmString.isInvalid()) {
1400 const auto *SL = cast<StringLiteral>(AsmString.get());
1401 if (!SL->isAscii()) {
1402 Diag(Tok, diag::err_asm_operand_wide_string_literal)
1403 << SL->isWide()
1404 << SL->getSourceRange();
1405 return ExprError();
1406 }
1407 }
1408 return AsmString;
1409 }
1410
1411 /// ParseSimpleAsm
1412 ///
1413 /// [GNU] simple-asm-expr:
1414 /// 'asm' '(' asm-string-literal ')'
1415 ///
ParseSimpleAsm(SourceLocation * EndLoc)1416 ExprResult Parser::ParseSimpleAsm(SourceLocation *EndLoc) {
1417 assert(Tok.is(tok::kw_asm) && "Not an asm!");
1418 SourceLocation Loc = ConsumeToken();
1419
1420 if (Tok.is(tok::kw_volatile)) {
1421 // Remove from the end of 'asm' to the end of 'volatile'.
1422 SourceRange RemovalRange(PP.getLocForEndOfToken(Loc),
1423 PP.getLocForEndOfToken(Tok.getLocation()));
1424
1425 Diag(Tok, diag::warn_file_asm_volatile)
1426 << FixItHint::CreateRemoval(RemovalRange);
1427 ConsumeToken();
1428 }
1429
1430 BalancedDelimiterTracker T(*this, tok::l_paren);
1431 if (T.consumeOpen()) {
1432 Diag(Tok, diag::err_expected_lparen_after) << "asm";
1433 return ExprError();
1434 }
1435
1436 ExprResult Result(ParseAsmStringLiteral());
1437
1438 if (!Result.isInvalid()) {
1439 // Close the paren and get the location of the end bracket
1440 T.consumeClose();
1441 if (EndLoc)
1442 *EndLoc = T.getCloseLocation();
1443 } else if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch)) {
1444 if (EndLoc)
1445 *EndLoc = Tok.getLocation();
1446 ConsumeParen();
1447 }
1448
1449 return Result;
1450 }
1451
1452 /// Get the TemplateIdAnnotation from the token and put it in the
1453 /// cleanup pool so that it gets destroyed when parsing the current top level
1454 /// declaration is finished.
takeTemplateIdAnnotation(const Token & tok)1455 TemplateIdAnnotation *Parser::takeTemplateIdAnnotation(const Token &tok) {
1456 assert(tok.is(tok::annot_template_id) && "Expected template-id token");
1457 TemplateIdAnnotation *
1458 Id = static_cast<TemplateIdAnnotation *>(tok.getAnnotationValue());
1459 return Id;
1460 }
1461
AnnotateScopeToken(CXXScopeSpec & SS,bool IsNewAnnotation)1462 void Parser::AnnotateScopeToken(CXXScopeSpec &SS, bool IsNewAnnotation) {
1463 // Push the current token back into the token stream (or revert it if it is
1464 // cached) and use an annotation scope token for current token.
1465 if (PP.isBacktrackEnabled())
1466 PP.RevertCachedTokens(1);
1467 else
1468 PP.EnterToken(Tok);
1469 Tok.setKind(tok::annot_cxxscope);
1470 Tok.setAnnotationValue(Actions.SaveNestedNameSpecifierAnnotation(SS));
1471 Tok.setAnnotationRange(SS.getRange());
1472
1473 // In case the tokens were cached, have Preprocessor replace them
1474 // with the annotation token. We don't need to do this if we've
1475 // just reverted back to a prior state.
1476 if (IsNewAnnotation)
1477 PP.AnnotateCachedTokens(Tok);
1478 }
1479
1480 /// Attempt to classify the name at the current token position. This may
1481 /// form a type, scope or primary expression annotation, or replace the token
1482 /// with a typo-corrected keyword. This is only appropriate when the current
1483 /// name must refer to an entity which has already been declared.
1484 ///
1485 /// \param IsAddressOfOperand Must be \c true if the name is preceded by an '&'
1486 /// and might possibly have a dependent nested name specifier.
1487 /// \param CCC Indicates how to perform typo-correction for this name. If NULL,
1488 /// no typo correction will be performed.
1489 Parser::AnnotatedNameKind
TryAnnotateName(bool IsAddressOfOperand,std::unique_ptr<CorrectionCandidateCallback> CCC)1490 Parser::TryAnnotateName(bool IsAddressOfOperand,
1491 std::unique_ptr<CorrectionCandidateCallback> CCC) {
1492 assert(Tok.is(tok::identifier) || Tok.is(tok::annot_cxxscope));
1493
1494 const bool EnteringContext = false;
1495 const bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1496
1497 CXXScopeSpec SS;
1498 if (getLangOpts().CPlusPlus &&
1499 ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1500 return ANK_Error;
1501
1502 if (Tok.isNot(tok::identifier) || SS.isInvalid()) {
1503 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1504 return ANK_Error;
1505 return ANK_Unresolved;
1506 }
1507
1508 IdentifierInfo *Name = Tok.getIdentifierInfo();
1509 SourceLocation NameLoc = Tok.getLocation();
1510
1511 // FIXME: Move the tentative declaration logic into ClassifyName so we can
1512 // typo-correct to tentatively-declared identifiers.
1513 if (isTentativelyDeclared(Name)) {
1514 // Identifier has been tentatively declared, and thus cannot be resolved as
1515 // an expression. Fall back to annotating it as a type.
1516 if (TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation))
1517 return ANK_Error;
1518 return Tok.is(tok::annot_typename) ? ANK_Success : ANK_TentativeDecl;
1519 }
1520
1521 Token Next = NextToken();
1522
1523 // Look up and classify the identifier. We don't perform any typo-correction
1524 // after a scope specifier, because in general we can't recover from typos
1525 // there (eg, after correcting 'A::template B<X>::C' [sic], we would need to
1526 // jump back into scope specifier parsing).
1527 Sema::NameClassification Classification = Actions.ClassifyName(
1528 getCurScope(), SS, Name, NameLoc, Next, IsAddressOfOperand,
1529 SS.isEmpty() ? std::move(CCC) : nullptr);
1530
1531 switch (Classification.getKind()) {
1532 case Sema::NC_Error:
1533 return ANK_Error;
1534
1535 case Sema::NC_Keyword:
1536 // The identifier was typo-corrected to a keyword.
1537 Tok.setIdentifierInfo(Name);
1538 Tok.setKind(Name->getTokenID());
1539 PP.TypoCorrectToken(Tok);
1540 if (SS.isNotEmpty())
1541 AnnotateScopeToken(SS, !WasScopeAnnotation);
1542 // We've "annotated" this as a keyword.
1543 return ANK_Success;
1544
1545 case Sema::NC_Unknown:
1546 // It's not something we know about. Leave it unannotated.
1547 break;
1548
1549 case Sema::NC_Type: {
1550 SourceLocation BeginLoc = NameLoc;
1551 if (SS.isNotEmpty())
1552 BeginLoc = SS.getBeginLoc();
1553
1554 /// An Objective-C object type followed by '<' is a specialization of
1555 /// a parameterized class type or a protocol-qualified type.
1556 ParsedType Ty = Classification.getType();
1557 if (getLangOpts().ObjC && NextToken().is(tok::less) &&
1558 (Ty.get()->isObjCObjectType() ||
1559 Ty.get()->isObjCObjectPointerType())) {
1560 // Consume the name.
1561 SourceLocation IdentifierLoc = ConsumeToken();
1562 SourceLocation NewEndLoc;
1563 TypeResult NewType
1564 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1565 /*consumeLastToken=*/false,
1566 NewEndLoc);
1567 if (NewType.isUsable())
1568 Ty = NewType.get();
1569 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1570 return ANK_Error;
1571 }
1572
1573 Tok.setKind(tok::annot_typename);
1574 setTypeAnnotation(Tok, Ty);
1575 Tok.setAnnotationEndLoc(Tok.getLocation());
1576 Tok.setLocation(BeginLoc);
1577 PP.AnnotateCachedTokens(Tok);
1578 return ANK_Success;
1579 }
1580
1581 case Sema::NC_Expression:
1582 Tok.setKind(tok::annot_primary_expr);
1583 setExprAnnotation(Tok, Classification.getExpression());
1584 Tok.setAnnotationEndLoc(NameLoc);
1585 if (SS.isNotEmpty())
1586 Tok.setLocation(SS.getBeginLoc());
1587 PP.AnnotateCachedTokens(Tok);
1588 return ANK_Success;
1589
1590 case Sema::NC_TypeTemplate:
1591 if (Next.isNot(tok::less)) {
1592 // This may be a type template being used as a template template argument.
1593 if (SS.isNotEmpty())
1594 AnnotateScopeToken(SS, !WasScopeAnnotation);
1595 return ANK_TemplateName;
1596 }
1597 LLVM_FALLTHROUGH;
1598 case Sema::NC_VarTemplate:
1599 case Sema::NC_FunctionTemplate: {
1600 // We have a type, variable or function template followed by '<'.
1601 ConsumeToken();
1602 UnqualifiedId Id;
1603 Id.setIdentifier(Name, NameLoc);
1604 if (AnnotateTemplateIdToken(
1605 TemplateTy::make(Classification.getTemplateName()),
1606 Classification.getTemplateNameKind(), SS, SourceLocation(), Id))
1607 return ANK_Error;
1608 return ANK_Success;
1609 }
1610
1611 case Sema::NC_NestedNameSpecifier:
1612 llvm_unreachable("already parsed nested name specifier");
1613 }
1614
1615 // Unable to classify the name, but maybe we can annotate a scope specifier.
1616 if (SS.isNotEmpty())
1617 AnnotateScopeToken(SS, !WasScopeAnnotation);
1618 return ANK_Unresolved;
1619 }
1620
TryKeywordIdentFallback(bool DisableKeyword)1621 bool Parser::TryKeywordIdentFallback(bool DisableKeyword) {
1622 assert(Tok.isNot(tok::identifier));
1623 Diag(Tok, diag::ext_keyword_as_ident)
1624 << PP.getSpelling(Tok)
1625 << DisableKeyword;
1626 if (DisableKeyword)
1627 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
1628 Tok.setKind(tok::identifier);
1629 return true;
1630 }
1631
1632 /// TryAnnotateTypeOrScopeToken - If the current token position is on a
1633 /// typename (possibly qualified in C++) or a C++ scope specifier not followed
1634 /// by a typename, TryAnnotateTypeOrScopeToken will replace one or more tokens
1635 /// with a single annotation token representing the typename or C++ scope
1636 /// respectively.
1637 /// This simplifies handling of C++ scope specifiers and allows efficient
1638 /// backtracking without the need to re-parse and resolve nested-names and
1639 /// typenames.
1640 /// It will mainly be called when we expect to treat identifiers as typenames
1641 /// (if they are typenames). For example, in C we do not expect identifiers
1642 /// inside expressions to be treated as typenames so it will not be called
1643 /// for expressions in C.
1644 /// The benefit for C/ObjC is that a typename will be annotated and
1645 /// Actions.getTypeName will not be needed to be called again (e.g. getTypeName
1646 /// will not be called twice, once to check whether we have a declaration
1647 /// specifier, and another one to get the actual type inside
1648 /// ParseDeclarationSpecifiers).
1649 ///
1650 /// This returns true if an error occurred.
1651 ///
1652 /// Note that this routine emits an error if you call it with ::new or ::delete
1653 /// as the current tokens, so only call it in contexts where these are invalid.
TryAnnotateTypeOrScopeToken()1654 bool Parser::TryAnnotateTypeOrScopeToken() {
1655 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1656 Tok.is(tok::kw_typename) || Tok.is(tok::annot_cxxscope) ||
1657 Tok.is(tok::kw_decltype) || Tok.is(tok::annot_template_id) ||
1658 Tok.is(tok::kw___super)) &&
1659 "Cannot be a type or scope token!");
1660
1661 if (Tok.is(tok::kw_typename)) {
1662 // MSVC lets you do stuff like:
1663 // typename typedef T_::D D;
1664 //
1665 // We will consume the typedef token here and put it back after we have
1666 // parsed the first identifier, transforming it into something more like:
1667 // typename T_::D typedef D;
1668 if (getLangOpts().MSVCCompat && NextToken().is(tok::kw_typedef)) {
1669 Token TypedefToken;
1670 PP.Lex(TypedefToken);
1671 bool Result = TryAnnotateTypeOrScopeToken();
1672 PP.EnterToken(Tok);
1673 Tok = TypedefToken;
1674 if (!Result)
1675 Diag(Tok.getLocation(), diag::warn_expected_qualified_after_typename);
1676 return Result;
1677 }
1678
1679 // Parse a C++ typename-specifier, e.g., "typename T::type".
1680 //
1681 // typename-specifier:
1682 // 'typename' '::' [opt] nested-name-specifier identifier
1683 // 'typename' '::' [opt] nested-name-specifier template [opt]
1684 // simple-template-id
1685 SourceLocation TypenameLoc = ConsumeToken();
1686 CXXScopeSpec SS;
1687 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
1688 /*EnteringContext=*/false, nullptr,
1689 /*IsTypename*/ true))
1690 return true;
1691 if (!SS.isSet()) {
1692 if (Tok.is(tok::identifier) || Tok.is(tok::annot_template_id) ||
1693 Tok.is(tok::annot_decltype)) {
1694 // Attempt to recover by skipping the invalid 'typename'
1695 if (Tok.is(tok::annot_decltype) ||
1696 (!TryAnnotateTypeOrScopeToken() && Tok.isAnnotation())) {
1697 unsigned DiagID = diag::err_expected_qualified_after_typename;
1698 // MS compatibility: MSVC permits using known types with typename.
1699 // e.g. "typedef typename T* pointer_type"
1700 if (getLangOpts().MicrosoftExt)
1701 DiagID = diag::warn_expected_qualified_after_typename;
1702 Diag(Tok.getLocation(), DiagID);
1703 return false;
1704 }
1705 }
1706 if (Tok.isEditorPlaceholder())
1707 return true;
1708
1709 Diag(Tok.getLocation(), diag::err_expected_qualified_after_typename);
1710 return true;
1711 }
1712
1713 TypeResult Ty;
1714 if (Tok.is(tok::identifier)) {
1715 // FIXME: check whether the next token is '<', first!
1716 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1717 *Tok.getIdentifierInfo(),
1718 Tok.getLocation());
1719 } else if (Tok.is(tok::annot_template_id)) {
1720 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1721 if (TemplateId->Kind != TNK_Type_template &&
1722 TemplateId->Kind != TNK_Dependent_template_name) {
1723 Diag(Tok, diag::err_typename_refers_to_non_type_template)
1724 << Tok.getAnnotationRange();
1725 return true;
1726 }
1727
1728 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
1729 TemplateId->NumArgs);
1730
1731 Ty = Actions.ActOnTypenameType(getCurScope(), TypenameLoc, SS,
1732 TemplateId->TemplateKWLoc,
1733 TemplateId->Template,
1734 TemplateId->Name,
1735 TemplateId->TemplateNameLoc,
1736 TemplateId->LAngleLoc,
1737 TemplateArgsPtr,
1738 TemplateId->RAngleLoc);
1739 } else {
1740 Diag(Tok, diag::err_expected_type_name_after_typename)
1741 << SS.getRange();
1742 return true;
1743 }
1744
1745 SourceLocation EndLoc = Tok.getLastLoc();
1746 Tok.setKind(tok::annot_typename);
1747 setTypeAnnotation(Tok, Ty.isInvalid() ? nullptr : Ty.get());
1748 Tok.setAnnotationEndLoc(EndLoc);
1749 Tok.setLocation(TypenameLoc);
1750 PP.AnnotateCachedTokens(Tok);
1751 return false;
1752 }
1753
1754 // Remembers whether the token was originally a scope annotation.
1755 bool WasScopeAnnotation = Tok.is(tok::annot_cxxscope);
1756
1757 CXXScopeSpec SS;
1758 if (getLangOpts().CPlusPlus)
1759 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext*/false))
1760 return true;
1761
1762 return TryAnnotateTypeOrScopeTokenAfterScopeSpec(SS, !WasScopeAnnotation);
1763 }
1764
1765 /// Try to annotate a type or scope token, having already parsed an
1766 /// optional scope specifier. \p IsNewScope should be \c true unless the scope
1767 /// specifier was extracted from an existing tok::annot_cxxscope annotation.
TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec & SS,bool IsNewScope)1768 bool Parser::TryAnnotateTypeOrScopeTokenAfterScopeSpec(CXXScopeSpec &SS,
1769 bool IsNewScope) {
1770 if (Tok.is(tok::identifier)) {
1771 // Determine whether the identifier is a type name.
1772 if (ParsedType Ty = Actions.getTypeName(
1773 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), &SS,
1774 false, NextToken().is(tok::period), nullptr,
1775 /*IsCtorOrDtorName=*/false,
1776 /*NonTrivialTypeSourceInfo*/true,
1777 /*IsClassTemplateDeductionContext*/true)) {
1778 SourceLocation BeginLoc = Tok.getLocation();
1779 if (SS.isNotEmpty()) // it was a C++ qualified type name.
1780 BeginLoc = SS.getBeginLoc();
1781
1782 /// An Objective-C object type followed by '<' is a specialization of
1783 /// a parameterized class type or a protocol-qualified type.
1784 if (getLangOpts().ObjC && NextToken().is(tok::less) &&
1785 (Ty.get()->isObjCObjectType() ||
1786 Ty.get()->isObjCObjectPointerType())) {
1787 // Consume the name.
1788 SourceLocation IdentifierLoc = ConsumeToken();
1789 SourceLocation NewEndLoc;
1790 TypeResult NewType
1791 = parseObjCTypeArgsAndProtocolQualifiers(IdentifierLoc, Ty,
1792 /*consumeLastToken=*/false,
1793 NewEndLoc);
1794 if (NewType.isUsable())
1795 Ty = NewType.get();
1796 else if (Tok.is(tok::eof)) // Nothing to do here, bail out...
1797 return false;
1798 }
1799
1800 // This is a typename. Replace the current token in-place with an
1801 // annotation type token.
1802 Tok.setKind(tok::annot_typename);
1803 setTypeAnnotation(Tok, Ty);
1804 Tok.setAnnotationEndLoc(Tok.getLocation());
1805 Tok.setLocation(BeginLoc);
1806
1807 // In case the tokens were cached, have Preprocessor replace
1808 // them with the annotation token.
1809 PP.AnnotateCachedTokens(Tok);
1810 return false;
1811 }
1812
1813 if (!getLangOpts().CPlusPlus) {
1814 // If we're in C, we can't have :: tokens at all (the lexer won't return
1815 // them). If the identifier is not a type, then it can't be scope either,
1816 // just early exit.
1817 return false;
1818 }
1819
1820 // If this is a template-id, annotate with a template-id or type token.
1821 if (NextToken().is(tok::less)) {
1822 TemplateTy Template;
1823 UnqualifiedId TemplateName;
1824 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1825 bool MemberOfUnknownSpecialization;
1826 if (TemplateNameKind TNK = Actions.isTemplateName(
1827 getCurScope(), SS,
1828 /*hasTemplateKeyword=*/false, TemplateName,
1829 /*ObjectType=*/nullptr, /*EnteringContext*/false, Template,
1830 MemberOfUnknownSpecialization)) {
1831 // Consume the identifier.
1832 ConsumeToken();
1833 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
1834 TemplateName)) {
1835 // If an unrecoverable error occurred, we need to return true here,
1836 // because the token stream is in a damaged state. We may not return
1837 // a valid identifier.
1838 return true;
1839 }
1840 }
1841 }
1842
1843 // The current token, which is either an identifier or a
1844 // template-id, is not part of the annotation. Fall through to
1845 // push that token back into the stream and complete the C++ scope
1846 // specifier annotation.
1847 }
1848
1849 if (Tok.is(tok::annot_template_id)) {
1850 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1851 if (TemplateId->Kind == TNK_Type_template) {
1852 // A template-id that refers to a type was parsed into a
1853 // template-id annotation in a context where we weren't allowed
1854 // to produce a type annotation token. Update the template-id
1855 // annotation token to a type annotation token now.
1856 AnnotateTemplateIdTokenAsType();
1857 return false;
1858 }
1859 }
1860
1861 if (SS.isEmpty())
1862 return false;
1863
1864 // A C++ scope specifier that isn't followed by a typename.
1865 AnnotateScopeToken(SS, IsNewScope);
1866 return false;
1867 }
1868
1869 /// TryAnnotateScopeToken - Like TryAnnotateTypeOrScopeToken but only
1870 /// annotates C++ scope specifiers and template-ids. This returns
1871 /// true if there was an error that could not be recovered from.
1872 ///
1873 /// Note that this routine emits an error if you call it with ::new or ::delete
1874 /// as the current tokens, so only call it in contexts where these are invalid.
TryAnnotateCXXScopeToken(bool EnteringContext)1875 bool Parser::TryAnnotateCXXScopeToken(bool EnteringContext) {
1876 assert(getLangOpts().CPlusPlus &&
1877 "Call sites of this function should be guarded by checking for C++");
1878 assert((Tok.is(tok::identifier) || Tok.is(tok::coloncolon) ||
1879 (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) ||
1880 Tok.is(tok::kw_decltype) || Tok.is(tok::kw___super)) &&
1881 "Cannot be a type or scope token!");
1882
1883 CXXScopeSpec SS;
1884 if (ParseOptionalCXXScopeSpecifier(SS, nullptr, EnteringContext))
1885 return true;
1886 if (SS.isEmpty())
1887 return false;
1888
1889 AnnotateScopeToken(SS, true);
1890 return false;
1891 }
1892
isTokenEqualOrEqualTypo()1893 bool Parser::isTokenEqualOrEqualTypo() {
1894 tok::TokenKind Kind = Tok.getKind();
1895 switch (Kind) {
1896 default:
1897 return false;
1898 case tok::ampequal: // &=
1899 case tok::starequal: // *=
1900 case tok::plusequal: // +=
1901 case tok::minusequal: // -=
1902 case tok::exclaimequal: // !=
1903 case tok::slashequal: // /=
1904 case tok::percentequal: // %=
1905 case tok::lessequal: // <=
1906 case tok::lesslessequal: // <<=
1907 case tok::greaterequal: // >=
1908 case tok::greatergreaterequal: // >>=
1909 case tok::caretequal: // ^=
1910 case tok::pipeequal: // |=
1911 case tok::equalequal: // ==
1912 Diag(Tok, diag::err_invalid_token_after_declarator_suggest_equal)
1913 << Kind
1914 << FixItHint::CreateReplacement(SourceRange(Tok.getLocation()), "=");
1915 LLVM_FALLTHROUGH;
1916 case tok::equal:
1917 return true;
1918 }
1919 }
1920
handleUnexpectedCodeCompletionToken()1921 SourceLocation Parser::handleUnexpectedCodeCompletionToken() {
1922 assert(Tok.is(tok::code_completion));
1923 PrevTokLocation = Tok.getLocation();
1924
1925 for (Scope *S = getCurScope(); S; S = S->getParent()) {
1926 if (S->getFlags() & Scope::FnScope) {
1927 Actions.CodeCompleteOrdinaryName(getCurScope(),
1928 Sema::PCC_RecoveryInFunction);
1929 cutOffParsing();
1930 return PrevTokLocation;
1931 }
1932
1933 if (S->getFlags() & Scope::ClassScope) {
1934 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Class);
1935 cutOffParsing();
1936 return PrevTokLocation;
1937 }
1938 }
1939
1940 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Namespace);
1941 cutOffParsing();
1942 return PrevTokLocation;
1943 }
1944
1945 // Code-completion pass-through functions
1946
CodeCompleteDirective(bool InConditional)1947 void Parser::CodeCompleteDirective(bool InConditional) {
1948 Actions.CodeCompletePreprocessorDirective(InConditional);
1949 }
1950
CodeCompleteInConditionalExclusion()1951 void Parser::CodeCompleteInConditionalExclusion() {
1952 Actions.CodeCompleteInPreprocessorConditionalExclusion(getCurScope());
1953 }
1954
CodeCompleteMacroName(bool IsDefinition)1955 void Parser::CodeCompleteMacroName(bool IsDefinition) {
1956 Actions.CodeCompletePreprocessorMacroName(IsDefinition);
1957 }
1958
CodeCompletePreprocessorExpression()1959 void Parser::CodeCompletePreprocessorExpression() {
1960 Actions.CodeCompletePreprocessorExpression();
1961 }
1962
CodeCompleteMacroArgument(IdentifierInfo * Macro,MacroInfo * MacroInfo,unsigned ArgumentIndex)1963 void Parser::CodeCompleteMacroArgument(IdentifierInfo *Macro,
1964 MacroInfo *MacroInfo,
1965 unsigned ArgumentIndex) {
1966 Actions.CodeCompletePreprocessorMacroArgument(getCurScope(), Macro, MacroInfo,
1967 ArgumentIndex);
1968 }
1969
CodeCompleteIncludedFile(llvm::StringRef Dir,bool IsAngled)1970 void Parser::CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {
1971 Actions.CodeCompleteIncludedFile(Dir, IsAngled);
1972 }
1973
CodeCompleteNaturalLanguage()1974 void Parser::CodeCompleteNaturalLanguage() {
1975 Actions.CodeCompleteNaturalLanguage();
1976 }
1977
ParseMicrosoftIfExistsCondition(IfExistsCondition & Result)1978 bool Parser::ParseMicrosoftIfExistsCondition(IfExistsCondition& Result) {
1979 assert((Tok.is(tok::kw___if_exists) || Tok.is(tok::kw___if_not_exists)) &&
1980 "Expected '__if_exists' or '__if_not_exists'");
1981 Result.IsIfExists = Tok.is(tok::kw___if_exists);
1982 Result.KeywordLoc = ConsumeToken();
1983
1984 BalancedDelimiterTracker T(*this, tok::l_paren);
1985 if (T.consumeOpen()) {
1986 Diag(Tok, diag::err_expected_lparen_after)
1987 << (Result.IsIfExists? "__if_exists" : "__if_not_exists");
1988 return true;
1989 }
1990
1991 // Parse nested-name-specifier.
1992 if (getLangOpts().CPlusPlus)
1993 ParseOptionalCXXScopeSpecifier(Result.SS, nullptr,
1994 /*EnteringContext=*/false);
1995
1996 // Check nested-name specifier.
1997 if (Result.SS.isInvalid()) {
1998 T.skipToEnd();
1999 return true;
2000 }
2001
2002 // Parse the unqualified-id.
2003 SourceLocation TemplateKWLoc; // FIXME: parsed, but unused.
2004 if (ParseUnqualifiedId(
2005 Result.SS, /*EnteringContext*/false, /*AllowDestructorName*/true,
2006 /*AllowConstructorName*/true, /*AllowDeductionGuide*/false, nullptr,
2007 &TemplateKWLoc, Result.Name)) {
2008 T.skipToEnd();
2009 return true;
2010 }
2011
2012 if (T.consumeClose())
2013 return true;
2014
2015 // Check if the symbol exists.
2016 switch (Actions.CheckMicrosoftIfExistsSymbol(getCurScope(), Result.KeywordLoc,
2017 Result.IsIfExists, Result.SS,
2018 Result.Name)) {
2019 case Sema::IER_Exists:
2020 Result.Behavior = Result.IsIfExists ? IEB_Parse : IEB_Skip;
2021 break;
2022
2023 case Sema::IER_DoesNotExist:
2024 Result.Behavior = !Result.IsIfExists ? IEB_Parse : IEB_Skip;
2025 break;
2026
2027 case Sema::IER_Dependent:
2028 Result.Behavior = IEB_Dependent;
2029 break;
2030
2031 case Sema::IER_Error:
2032 return true;
2033 }
2034
2035 return false;
2036 }
2037
ParseMicrosoftIfExistsExternalDeclaration()2038 void Parser::ParseMicrosoftIfExistsExternalDeclaration() {
2039 IfExistsCondition Result;
2040 if (ParseMicrosoftIfExistsCondition(Result))
2041 return;
2042
2043 BalancedDelimiterTracker Braces(*this, tok::l_brace);
2044 if (Braces.consumeOpen()) {
2045 Diag(Tok, diag::err_expected) << tok::l_brace;
2046 return;
2047 }
2048
2049 switch (Result.Behavior) {
2050 case IEB_Parse:
2051 // Parse declarations below.
2052 break;
2053
2054 case IEB_Dependent:
2055 llvm_unreachable("Cannot have a dependent external declaration");
2056
2057 case IEB_Skip:
2058 Braces.skipToEnd();
2059 return;
2060 }
2061
2062 // Parse the declarations.
2063 // FIXME: Support module import within __if_exists?
2064 while (Tok.isNot(tok::r_brace) && !isEofOrEom()) {
2065 ParsedAttributesWithRange attrs(AttrFactory);
2066 MaybeParseCXX11Attributes(attrs);
2067 DeclGroupPtrTy Result = ParseExternalDeclaration(attrs);
2068 if (Result && !getCurScope()->getParent())
2069 Actions.getASTConsumer().HandleTopLevelDecl(Result.get());
2070 }
2071 Braces.consumeClose();
2072 }
2073
2074 /// Parse a C++ Modules TS module declaration, which appears at the beginning
2075 /// of a module interface, module partition, or module implementation file.
2076 ///
2077 /// module-declaration: [Modules TS + P0273R0 + P0629R0]
2078 /// 'export'[opt] 'module' 'partition'[opt]
2079 /// module-name attribute-specifier-seq[opt] ';'
2080 ///
2081 /// Note that 'partition' is a context-sensitive keyword.
ParseModuleDecl()2082 Parser::DeclGroupPtrTy Parser::ParseModuleDecl() {
2083 SourceLocation StartLoc = Tok.getLocation();
2084
2085 Sema::ModuleDeclKind MDK = TryConsumeToken(tok::kw_export)
2086 ? Sema::ModuleDeclKind::Interface
2087 : Sema::ModuleDeclKind::Implementation;
2088
2089 assert(Tok.is(tok::kw_module) && "not a module declaration");
2090 SourceLocation ModuleLoc = ConsumeToken();
2091
2092 if (Tok.is(tok::identifier) && NextToken().is(tok::identifier) &&
2093 Tok.getIdentifierInfo()->isStr("partition")) {
2094 // If 'partition' is present, this must be a module interface unit.
2095 if (MDK != Sema::ModuleDeclKind::Interface)
2096 Diag(Tok.getLocation(), diag::err_module_implementation_partition)
2097 << FixItHint::CreateInsertion(ModuleLoc, "export ");
2098 MDK = Sema::ModuleDeclKind::Partition;
2099 ConsumeToken();
2100 }
2101
2102 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2103 if (ParseModuleName(ModuleLoc, Path, /*IsImport*/false))
2104 return nullptr;
2105
2106 // We don't support any module attributes yet; just parse them and diagnose.
2107 ParsedAttributesWithRange Attrs(AttrFactory);
2108 MaybeParseCXX11Attributes(Attrs);
2109 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_module_attr);
2110
2111 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2112
2113 return Actions.ActOnModuleDecl(StartLoc, ModuleLoc, MDK, Path);
2114 }
2115
2116 /// Parse a module import declaration. This is essentially the same for
2117 /// Objective-C and the C++ Modules TS, except for the leading '@' (in ObjC)
2118 /// and the trailing optional attributes (in C++).
2119 ///
2120 /// [ObjC] @import declaration:
2121 /// '@' 'import' module-name ';'
2122 /// [ModTS] module-import-declaration:
2123 /// 'import' module-name attribute-specifier-seq[opt] ';'
ParseModuleImport(SourceLocation AtLoc)2124 Decl *Parser::ParseModuleImport(SourceLocation AtLoc) {
2125 assert((AtLoc.isInvalid() ? Tok.is(tok::kw_import)
2126 : Tok.isObjCAtKeyword(tok::objc_import)) &&
2127 "Improper start to module import");
2128 bool IsObjCAtImport = Tok.isObjCAtKeyword(tok::objc_import);
2129 SourceLocation ImportLoc = ConsumeToken();
2130 SourceLocation StartLoc = AtLoc.isInvalid() ? ImportLoc : AtLoc;
2131
2132 SmallVector<std::pair<IdentifierInfo *, SourceLocation>, 2> Path;
2133 if (ParseModuleName(ImportLoc, Path, /*IsImport*/true))
2134 return nullptr;
2135
2136 ParsedAttributesWithRange Attrs(AttrFactory);
2137 MaybeParseCXX11Attributes(Attrs);
2138 // We don't support any module import attributes yet.
2139 ProhibitCXX11Attributes(Attrs, diag::err_attribute_not_import_attr);
2140
2141 if (PP.hadModuleLoaderFatalFailure()) {
2142 // With a fatal failure in the module loader, we abort parsing.
2143 cutOffParsing();
2144 return nullptr;
2145 }
2146
2147 DeclResult Import = Actions.ActOnModuleImport(StartLoc, ImportLoc, Path);
2148 ExpectAndConsumeSemi(diag::err_module_expected_semi);
2149 if (Import.isInvalid())
2150 return nullptr;
2151
2152 // Using '@import' in framework headers requires modules to be enabled so that
2153 // the header is parseable. Emit a warning to make the user aware.
2154 if (IsObjCAtImport && AtLoc.isValid()) {
2155 auto &SrcMgr = PP.getSourceManager();
2156 auto *FE = SrcMgr.getFileEntryForID(SrcMgr.getFileID(AtLoc));
2157 if (FE && llvm::sys::path::parent_path(FE->getDir()->getName())
2158 .endswith(".framework"))
2159 Diags.Report(AtLoc, diag::warn_atimport_in_framework_header);
2160 }
2161
2162 return Import.get();
2163 }
2164
2165 /// Parse a C++ Modules TS / Objective-C module name (both forms use the same
2166 /// grammar).
2167 ///
2168 /// module-name:
2169 /// module-name-qualifier[opt] identifier
2170 /// module-name-qualifier:
2171 /// module-name-qualifier[opt] identifier '.'
ParseModuleName(SourceLocation UseLoc,SmallVectorImpl<std::pair<IdentifierInfo *,SourceLocation>> & Path,bool IsImport)2172 bool Parser::ParseModuleName(
2173 SourceLocation UseLoc,
2174 SmallVectorImpl<std::pair<IdentifierInfo *, SourceLocation>> &Path,
2175 bool IsImport) {
2176 // Parse the module path.
2177 while (true) {
2178 if (!Tok.is(tok::identifier)) {
2179 if (Tok.is(tok::code_completion)) {
2180 Actions.CodeCompleteModuleImport(UseLoc, Path);
2181 cutOffParsing();
2182 return true;
2183 }
2184
2185 Diag(Tok, diag::err_module_expected_ident) << IsImport;
2186 SkipUntil(tok::semi);
2187 return true;
2188 }
2189
2190 // Record this part of the module path.
2191 Path.push_back(std::make_pair(Tok.getIdentifierInfo(), Tok.getLocation()));
2192 ConsumeToken();
2193
2194 if (Tok.isNot(tok::period))
2195 return false;
2196
2197 ConsumeToken();
2198 }
2199 }
2200
2201 /// Try recover parser when module annotation appears where it must not
2202 /// be found.
2203 /// \returns false if the recover was successful and parsing may be continued, or
2204 /// true if parser must bail out to top level and handle the token there.
parseMisplacedModuleImport()2205 bool Parser::parseMisplacedModuleImport() {
2206 while (true) {
2207 switch (Tok.getKind()) {
2208 case tok::annot_module_end:
2209 // If we recovered from a misplaced module begin, we expect to hit a
2210 // misplaced module end too. Stay in the current context when this
2211 // happens.
2212 if (MisplacedModuleBeginCount) {
2213 --MisplacedModuleBeginCount;
2214 Actions.ActOnModuleEnd(Tok.getLocation(),
2215 reinterpret_cast<Module *>(
2216 Tok.getAnnotationValue()));
2217 ConsumeAnnotationToken();
2218 continue;
2219 }
2220 // Inform caller that recovery failed, the error must be handled at upper
2221 // level. This will generate the desired "missing '}' at end of module"
2222 // diagnostics on the way out.
2223 return true;
2224 case tok::annot_module_begin:
2225 // Recover by entering the module (Sema will diagnose).
2226 Actions.ActOnModuleBegin(Tok.getLocation(),
2227 reinterpret_cast<Module *>(
2228 Tok.getAnnotationValue()));
2229 ConsumeAnnotationToken();
2230 ++MisplacedModuleBeginCount;
2231 continue;
2232 case tok::annot_module_include:
2233 // Module import found where it should not be, for instance, inside a
2234 // namespace. Recover by importing the module.
2235 Actions.ActOnModuleInclude(Tok.getLocation(),
2236 reinterpret_cast<Module *>(
2237 Tok.getAnnotationValue()));
2238 ConsumeAnnotationToken();
2239 // If there is another module import, process it.
2240 continue;
2241 default:
2242 return false;
2243 }
2244 }
2245 return false;
2246 }
2247
diagnoseOverflow()2248 bool BalancedDelimiterTracker::diagnoseOverflow() {
2249 P.Diag(P.Tok, diag::err_bracket_depth_exceeded)
2250 << P.getLangOpts().BracketDepth;
2251 P.Diag(P.Tok, diag::note_bracket_depth);
2252 P.cutOffParsing();
2253 return true;
2254 }
2255
expectAndConsume(unsigned DiagID,const char * Msg,tok::TokenKind SkipToTok)2256 bool BalancedDelimiterTracker::expectAndConsume(unsigned DiagID,
2257 const char *Msg,
2258 tok::TokenKind SkipToTok) {
2259 LOpen = P.Tok.getLocation();
2260 if (P.ExpectAndConsume(Kind, DiagID, Msg)) {
2261 if (SkipToTok != tok::unknown)
2262 P.SkipUntil(SkipToTok, Parser::StopAtSemi);
2263 return true;
2264 }
2265
2266 if (getDepth() < P.getLangOpts().BracketDepth)
2267 return false;
2268
2269 return diagnoseOverflow();
2270 }
2271
diagnoseMissingClose()2272 bool BalancedDelimiterTracker::diagnoseMissingClose() {
2273 assert(!P.Tok.is(Close) && "Should have consumed closing delimiter");
2274
2275 if (P.Tok.is(tok::annot_module_end))
2276 P.Diag(P.Tok, diag::err_missing_before_module_end) << Close;
2277 else
2278 P.Diag(P.Tok, diag::err_expected) << Close;
2279 P.Diag(LOpen, diag::note_matching) << Kind;
2280
2281 // If we're not already at some kind of closing bracket, skip to our closing
2282 // token.
2283 if (P.Tok.isNot(tok::r_paren) && P.Tok.isNot(tok::r_brace) &&
2284 P.Tok.isNot(tok::r_square) &&
2285 P.SkipUntil(Close, FinalToken,
2286 Parser::StopAtSemi | Parser::StopBeforeMatch) &&
2287 P.Tok.is(Close))
2288 LClose = P.ConsumeAnyToken();
2289 return true;
2290 }
2291
skipToEnd()2292 void BalancedDelimiterTracker::skipToEnd() {
2293 P.SkipUntil(Close, Parser::StopBeforeMatch);
2294 consumeClose();
2295 }
2296