1 //===--- ParseDecl.cpp - Declaration Parsing --------------------*- C++ -*-===//
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 Declaration portions of the Parser interfaces.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "clang/Parse/Parser.h"
14 #include "clang/Parse/RAIIObjectsForParser.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/DeclTemplate.h"
17 #include "clang/AST/PrettyDeclStackTrace.h"
18 #include "clang/Basic/AddressSpaces.h"
19 #include "clang/Basic/Attributes.h"
20 #include "clang/Basic/CharInfo.h"
21 #include "clang/Basic/TargetInfo.h"
22 #include "clang/Parse/ParseDiagnostic.h"
23 #include "clang/Sema/Lookup.h"
24 #include "clang/Sema/ParsedTemplate.h"
25 #include "clang/Sema/Scope.h"
26 #include "llvm/ADT/Optional.h"
27 #include "llvm/ADT/SmallSet.h"
28 #include "llvm/ADT/SmallString.h"
29 #include "llvm/ADT/StringSwitch.h"
30
31 using namespace clang;
32
33 //===----------------------------------------------------------------------===//
34 // C99 6.7: Declarations.
35 //===----------------------------------------------------------------------===//
36
37 /// ParseTypeName
38 /// type-name: [C99 6.7.6]
39 /// specifier-qualifier-list abstract-declarator[opt]
40 ///
41 /// Called type-id in C++.
ParseTypeName(SourceRange * Range,DeclaratorContext Context,AccessSpecifier AS,Decl ** OwnedType,ParsedAttributes * Attrs)42 TypeResult Parser::ParseTypeName(SourceRange *Range,
43 DeclaratorContext Context,
44 AccessSpecifier AS,
45 Decl **OwnedType,
46 ParsedAttributes *Attrs) {
47 DeclSpecContext DSC = getDeclSpecContextFromDeclaratorContext(Context);
48 if (DSC == DeclSpecContext::DSC_normal)
49 DSC = DeclSpecContext::DSC_type_specifier;
50
51 // Parse the common declaration-specifiers piece.
52 DeclSpec DS(AttrFactory);
53 if (Attrs)
54 DS.addAttributes(*Attrs);
55 ParseSpecifierQualifierList(DS, AS, DSC);
56 if (OwnedType)
57 *OwnedType = DS.isTypeSpecOwned() ? DS.getRepAsDecl() : nullptr;
58
59 // Parse the abstract-declarator, if present.
60 Declarator DeclaratorInfo(DS, Context);
61 ParseDeclarator(DeclaratorInfo);
62 if (Range)
63 *Range = DeclaratorInfo.getSourceRange();
64
65 if (DeclaratorInfo.isInvalidType())
66 return true;
67
68 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
69 }
70
71 /// Normalizes an attribute name by dropping prefixed and suffixed __.
normalizeAttrName(StringRef Name)72 static StringRef normalizeAttrName(StringRef Name) {
73 if (Name.size() >= 4 && Name.startswith("__") && Name.endswith("__"))
74 return Name.drop_front(2).drop_back(2);
75 return Name;
76 }
77
78 /// isAttributeLateParsed - Return true if the attribute has arguments that
79 /// require late parsing.
isAttributeLateParsed(const IdentifierInfo & II)80 static bool isAttributeLateParsed(const IdentifierInfo &II) {
81 #define CLANG_ATTR_LATE_PARSED_LIST
82 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
83 #include "clang/Parse/AttrParserStringSwitches.inc"
84 .Default(false);
85 #undef CLANG_ATTR_LATE_PARSED_LIST
86 }
87
88 /// Check if the a start and end source location expand to the same macro.
FindLocsWithCommonFileID(Preprocessor & PP,SourceLocation StartLoc,SourceLocation EndLoc)89 static bool FindLocsWithCommonFileID(Preprocessor &PP, SourceLocation StartLoc,
90 SourceLocation EndLoc) {
91 if (!StartLoc.isMacroID() || !EndLoc.isMacroID())
92 return false;
93
94 SourceManager &SM = PP.getSourceManager();
95 if (SM.getFileID(StartLoc) != SM.getFileID(EndLoc))
96 return false;
97
98 bool AttrStartIsInMacro =
99 Lexer::isAtStartOfMacroExpansion(StartLoc, SM, PP.getLangOpts());
100 bool AttrEndIsInMacro =
101 Lexer::isAtEndOfMacroExpansion(EndLoc, SM, PP.getLangOpts());
102 return AttrStartIsInMacro && AttrEndIsInMacro;
103 }
104
105 /// ParseGNUAttributes - Parse a non-empty attributes list.
106 ///
107 /// [GNU] attributes:
108 /// attribute
109 /// attributes attribute
110 ///
111 /// [GNU] attribute:
112 /// '__attribute__' '(' '(' attribute-list ')' ')'
113 ///
114 /// [GNU] attribute-list:
115 /// attrib
116 /// attribute_list ',' attrib
117 ///
118 /// [GNU] attrib:
119 /// empty
120 /// attrib-name
121 /// attrib-name '(' identifier ')'
122 /// attrib-name '(' identifier ',' nonempty-expr-list ')'
123 /// attrib-name '(' argument-expression-list [C99 6.5.2] ')'
124 ///
125 /// [GNU] attrib-name:
126 /// identifier
127 /// typespec
128 /// typequal
129 /// storageclass
130 ///
131 /// Whether an attribute takes an 'identifier' is determined by the
132 /// attrib-name. GCC's behavior here is not worth imitating:
133 ///
134 /// * In C mode, if the attribute argument list starts with an identifier
135 /// followed by a ',' or an ')', and the identifier doesn't resolve to
136 /// a type, it is parsed as an identifier. If the attribute actually
137 /// wanted an expression, it's out of luck (but it turns out that no
138 /// attributes work that way, because C constant expressions are very
139 /// limited).
140 /// * In C++ mode, if the attribute argument list starts with an identifier,
141 /// and the attribute *wants* an identifier, it is parsed as an identifier.
142 /// At block scope, any additional tokens between the identifier and the
143 /// ',' or ')' are ignored, otherwise they produce a parse error.
144 ///
145 /// We follow the C++ model, but don't allow junk after the identifier.
ParseGNUAttributes(ParsedAttributes & attrs,SourceLocation * endLoc,LateParsedAttrList * LateAttrs,Declarator * D)146 void Parser::ParseGNUAttributes(ParsedAttributes &attrs,
147 SourceLocation *endLoc,
148 LateParsedAttrList *LateAttrs,
149 Declarator *D) {
150 assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!");
151
152 while (Tok.is(tok::kw___attribute)) {
153 SourceLocation AttrTokLoc = ConsumeToken();
154 unsigned OldNumAttrs = attrs.size();
155 unsigned OldNumLateAttrs = LateAttrs ? LateAttrs->size() : 0;
156
157 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
158 "attribute")) {
159 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
160 return;
161 }
162 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
163 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
164 return;
165 }
166 // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
167 do {
168 // Eat preceeding commas to allow __attribute__((,,,foo))
169 while (TryConsumeToken(tok::comma))
170 ;
171
172 // Expect an identifier or declaration specifier (const, int, etc.)
173 if (Tok.isAnnotation())
174 break;
175 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
176 if (!AttrName)
177 break;
178
179 SourceLocation AttrNameLoc = ConsumeToken();
180
181 if (Tok.isNot(tok::l_paren)) {
182 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
183 ParsedAttr::AS_GNU);
184 continue;
185 }
186
187 // Handle "parameterized" attributes
188 if (!LateAttrs || !isAttributeLateParsed(*AttrName)) {
189 ParseGNUAttributeArgs(AttrName, AttrNameLoc, attrs, endLoc, nullptr,
190 SourceLocation(), ParsedAttr::AS_GNU, D);
191 continue;
192 }
193
194 // Handle attributes with arguments that require late parsing.
195 LateParsedAttribute *LA =
196 new LateParsedAttribute(this, *AttrName, AttrNameLoc);
197 LateAttrs->push_back(LA);
198
199 // Attributes in a class are parsed at the end of the class, along
200 // with other late-parsed declarations.
201 if (!ClassStack.empty() && !LateAttrs->parseSoon())
202 getCurrentClass().LateParsedDeclarations.push_back(LA);
203
204 // Be sure ConsumeAndStoreUntil doesn't see the start l_paren, since it
205 // recursively consumes balanced parens.
206 LA->Toks.push_back(Tok);
207 ConsumeParen();
208 // Consume everything up to and including the matching right parens.
209 ConsumeAndStoreUntil(tok::r_paren, LA->Toks, /*StopAtSemi=*/true);
210
211 Token Eof;
212 Eof.startToken();
213 Eof.setLocation(Tok.getLocation());
214 LA->Toks.push_back(Eof);
215 } while (Tok.is(tok::comma));
216
217 if (ExpectAndConsume(tok::r_paren))
218 SkipUntil(tok::r_paren, StopAtSemi);
219 SourceLocation Loc = Tok.getLocation();
220 if (ExpectAndConsume(tok::r_paren))
221 SkipUntil(tok::r_paren, StopAtSemi);
222 if (endLoc)
223 *endLoc = Loc;
224
225 // If this was declared in a macro, attach the macro IdentifierInfo to the
226 // parsed attribute.
227 auto &SM = PP.getSourceManager();
228 if (!SM.isWrittenInBuiltinFile(SM.getSpellingLoc(AttrTokLoc)) &&
229 FindLocsWithCommonFileID(PP, AttrTokLoc, Loc)) {
230 CharSourceRange ExpansionRange = SM.getExpansionRange(AttrTokLoc);
231 StringRef FoundName =
232 Lexer::getSourceText(ExpansionRange, SM, PP.getLangOpts());
233 IdentifierInfo *MacroII = PP.getIdentifierInfo(FoundName);
234
235 for (unsigned i = OldNumAttrs; i < attrs.size(); ++i)
236 attrs[i].setMacroIdentifier(MacroII, ExpansionRange.getBegin());
237
238 if (LateAttrs) {
239 for (unsigned i = OldNumLateAttrs; i < LateAttrs->size(); ++i)
240 (*LateAttrs)[i]->MacroII = MacroII;
241 }
242 }
243 }
244 }
245
246 /// Determine whether the given attribute has an identifier argument.
attributeHasIdentifierArg(const IdentifierInfo & II)247 static bool attributeHasIdentifierArg(const IdentifierInfo &II) {
248 #define CLANG_ATTR_IDENTIFIER_ARG_LIST
249 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
250 #include "clang/Parse/AttrParserStringSwitches.inc"
251 .Default(false);
252 #undef CLANG_ATTR_IDENTIFIER_ARG_LIST
253 }
254
255 /// Determine whether the given attribute has a variadic identifier argument.
attributeHasVariadicIdentifierArg(const IdentifierInfo & II)256 static bool attributeHasVariadicIdentifierArg(const IdentifierInfo &II) {
257 #define CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
258 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
259 #include "clang/Parse/AttrParserStringSwitches.inc"
260 .Default(false);
261 #undef CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
262 }
263
264 /// Determine whether the given attribute treats kw_this as an identifier.
attributeTreatsKeywordThisAsIdentifier(const IdentifierInfo & II)265 static bool attributeTreatsKeywordThisAsIdentifier(const IdentifierInfo &II) {
266 #define CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
267 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
268 #include "clang/Parse/AttrParserStringSwitches.inc"
269 .Default(false);
270 #undef CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
271 }
272
273 /// Determine whether the given attribute parses a type argument.
attributeIsTypeArgAttr(const IdentifierInfo & II)274 static bool attributeIsTypeArgAttr(const IdentifierInfo &II) {
275 #define CLANG_ATTR_TYPE_ARG_LIST
276 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
277 #include "clang/Parse/AttrParserStringSwitches.inc"
278 .Default(false);
279 #undef CLANG_ATTR_TYPE_ARG_LIST
280 }
281
282 /// Determine whether the given attribute requires parsing its arguments
283 /// in an unevaluated context or not.
attributeParsedArgsUnevaluated(const IdentifierInfo & II)284 static bool attributeParsedArgsUnevaluated(const IdentifierInfo &II) {
285 #define CLANG_ATTR_ARG_CONTEXT_LIST
286 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
287 #include "clang/Parse/AttrParserStringSwitches.inc"
288 .Default(false);
289 #undef CLANG_ATTR_ARG_CONTEXT_LIST
290 }
291
ParseIdentifierLoc()292 IdentifierLoc *Parser::ParseIdentifierLoc() {
293 assert(Tok.is(tok::identifier) && "expected an identifier");
294 IdentifierLoc *IL = IdentifierLoc::create(Actions.Context,
295 Tok.getLocation(),
296 Tok.getIdentifierInfo());
297 ConsumeToken();
298 return IL;
299 }
300
ParseAttributeWithTypeArg(IdentifierInfo & AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)301 void Parser::ParseAttributeWithTypeArg(IdentifierInfo &AttrName,
302 SourceLocation AttrNameLoc,
303 ParsedAttributes &Attrs,
304 SourceLocation *EndLoc,
305 IdentifierInfo *ScopeName,
306 SourceLocation ScopeLoc,
307 ParsedAttr::Syntax Syntax) {
308 BalancedDelimiterTracker Parens(*this, tok::l_paren);
309 Parens.consumeOpen();
310
311 TypeResult T;
312 if (Tok.isNot(tok::r_paren))
313 T = ParseTypeName();
314
315 if (Parens.consumeClose())
316 return;
317
318 if (T.isInvalid())
319 return;
320
321 if (T.isUsable())
322 Attrs.addNewTypeAttr(&AttrName,
323 SourceRange(AttrNameLoc, Parens.getCloseLocation()),
324 ScopeName, ScopeLoc, T.get(), Syntax);
325 else
326 Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, Parens.getCloseLocation()),
327 ScopeName, ScopeLoc, nullptr, 0, Syntax);
328 }
329
ParseAttributeArgsCommon(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)330 unsigned Parser::ParseAttributeArgsCommon(
331 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
332 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
333 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
334 // Ignore the left paren location for now.
335 ConsumeParen();
336
337 bool ChangeKWThisToIdent = attributeTreatsKeywordThisAsIdentifier(*AttrName);
338 bool AttributeIsTypeArgAttr = attributeIsTypeArgAttr(*AttrName);
339
340 // Interpret "kw_this" as an identifier if the attributed requests it.
341 if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
342 Tok.setKind(tok::identifier);
343
344 ArgsVector ArgExprs;
345 if (Tok.is(tok::identifier)) {
346 // If this attribute wants an 'identifier' argument, make it so.
347 bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName) ||
348 attributeHasVariadicIdentifierArg(*AttrName);
349 ParsedAttr::Kind AttrKind =
350 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
351
352 // If we don't know how to parse this attribute, but this is the only
353 // token in this argument, assume it's meant to be an identifier.
354 if (AttrKind == ParsedAttr::UnknownAttribute ||
355 AttrKind == ParsedAttr::IgnoredAttribute) {
356 const Token &Next = NextToken();
357 IsIdentifierArg = Next.isOneOf(tok::r_paren, tok::comma);
358 }
359
360 if (IsIdentifierArg)
361 ArgExprs.push_back(ParseIdentifierLoc());
362 }
363
364 ParsedType TheParsedType;
365 if (!ArgExprs.empty() ? Tok.is(tok::comma) : Tok.isNot(tok::r_paren)) {
366 // Eat the comma.
367 if (!ArgExprs.empty())
368 ConsumeToken();
369
370 // Parse the non-empty comma-separated list of expressions.
371 do {
372 // Interpret "kw_this" as an identifier if the attributed requests it.
373 if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
374 Tok.setKind(tok::identifier);
375
376 ExprResult ArgExpr;
377 if (AttributeIsTypeArgAttr) {
378 TypeResult T = ParseTypeName();
379 if (T.isInvalid()) {
380 SkipUntil(tok::r_paren, StopAtSemi);
381 return 0;
382 }
383 if (T.isUsable())
384 TheParsedType = T.get();
385 break; // FIXME: Multiple type arguments are not implemented.
386 } else if (Tok.is(tok::identifier) &&
387 attributeHasVariadicIdentifierArg(*AttrName)) {
388 ArgExprs.push_back(ParseIdentifierLoc());
389 } else {
390 bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
391 EnterExpressionEvaluationContext Unevaluated(
392 Actions,
393 Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
394 : Sema::ExpressionEvaluationContext::ConstantEvaluated);
395
396 ExprResult ArgExpr(
397 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
398 if (ArgExpr.isInvalid()) {
399 SkipUntil(tok::r_paren, StopAtSemi);
400 return 0;
401 }
402 ArgExprs.push_back(ArgExpr.get());
403 }
404 // Eat the comma, move to the next argument
405 } while (TryConsumeToken(tok::comma));
406 }
407
408 SourceLocation RParen = Tok.getLocation();
409 if (!ExpectAndConsume(tok::r_paren)) {
410 SourceLocation AttrLoc = ScopeLoc.isValid() ? ScopeLoc : AttrNameLoc;
411
412 if (AttributeIsTypeArgAttr && !TheParsedType.get().isNull()) {
413 Attrs.addNewTypeAttr(AttrName, SourceRange(AttrNameLoc, RParen),
414 ScopeName, ScopeLoc, TheParsedType, Syntax);
415 } else {
416 Attrs.addNew(AttrName, SourceRange(AttrLoc, RParen), ScopeName, ScopeLoc,
417 ArgExprs.data(), ArgExprs.size(), Syntax);
418 }
419 }
420
421 if (EndLoc)
422 *EndLoc = RParen;
423
424 return static_cast<unsigned>(ArgExprs.size() + !TheParsedType.get().isNull());
425 }
426
427 /// Parse the arguments to a parameterized GNU attribute or
428 /// a C++11 attribute in "gnu" namespace.
ParseGNUAttributeArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax,Declarator * D)429 void Parser::ParseGNUAttributeArgs(IdentifierInfo *AttrName,
430 SourceLocation AttrNameLoc,
431 ParsedAttributes &Attrs,
432 SourceLocation *EndLoc,
433 IdentifierInfo *ScopeName,
434 SourceLocation ScopeLoc,
435 ParsedAttr::Syntax Syntax,
436 Declarator *D) {
437
438 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
439
440 ParsedAttr::Kind AttrKind =
441 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
442
443 if (AttrKind == ParsedAttr::AT_Availability) {
444 ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
445 ScopeLoc, Syntax);
446 return;
447 } else if (AttrKind == ParsedAttr::AT_ExternalSourceSymbol) {
448 ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
449 ScopeName, ScopeLoc, Syntax);
450 return;
451 } else if (AttrKind == ParsedAttr::AT_ObjCBridgeRelated) {
452 ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
453 ScopeName, ScopeLoc, Syntax);
454 return;
455 } else if (AttrKind == ParsedAttr::AT_TypeTagForDatatype) {
456 ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
457 ScopeName, ScopeLoc, Syntax);
458 return;
459 } else if (attributeIsTypeArgAttr(*AttrName)) {
460 ParseAttributeWithTypeArg(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
461 ScopeLoc, Syntax);
462 return;
463 }
464
465 // These may refer to the function arguments, but need to be parsed early to
466 // participate in determining whether it's a redeclaration.
467 llvm::Optional<ParseScope> PrototypeScope;
468 if (normalizeAttrName(AttrName->getName()) == "enable_if" &&
469 D && D->isFunctionDeclarator()) {
470 DeclaratorChunk::FunctionTypeInfo FTI = D->getFunctionTypeInfo();
471 PrototypeScope.emplace(this, Scope::FunctionPrototypeScope |
472 Scope::FunctionDeclarationScope |
473 Scope::DeclScope);
474 for (unsigned i = 0; i != FTI.NumParams; ++i) {
475 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
476 Actions.ActOnReenterCXXMethodParameter(getCurScope(), Param);
477 }
478 }
479
480 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
481 ScopeLoc, Syntax);
482 }
483
ParseClangAttributeArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)484 unsigned Parser::ParseClangAttributeArgs(
485 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
486 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
487 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
488 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
489
490 ParsedAttr::Kind AttrKind =
491 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
492
493 switch (AttrKind) {
494 default:
495 return ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
496 ScopeName, ScopeLoc, Syntax);
497 case ParsedAttr::AT_ExternalSourceSymbol:
498 ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
499 ScopeName, ScopeLoc, Syntax);
500 break;
501 case ParsedAttr::AT_Availability:
502 ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
503 ScopeLoc, Syntax);
504 break;
505 case ParsedAttr::AT_ObjCBridgeRelated:
506 ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
507 ScopeName, ScopeLoc, Syntax);
508 break;
509 case ParsedAttr::AT_TypeTagForDatatype:
510 ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
511 ScopeName, ScopeLoc, Syntax);
512 break;
513 }
514 return !Attrs.empty() ? Attrs.begin()->getNumArgs() : 0;
515 }
516
ParseMicrosoftDeclSpecArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs)517 bool Parser::ParseMicrosoftDeclSpecArgs(IdentifierInfo *AttrName,
518 SourceLocation AttrNameLoc,
519 ParsedAttributes &Attrs) {
520 // If the attribute isn't known, we will not attempt to parse any
521 // arguments.
522 if (!hasAttribute(AttrSyntax::Declspec, nullptr, AttrName,
523 getTargetInfo(), getLangOpts())) {
524 // Eat the left paren, then skip to the ending right paren.
525 ConsumeParen();
526 SkipUntil(tok::r_paren);
527 return false;
528 }
529
530 SourceLocation OpenParenLoc = Tok.getLocation();
531
532 if (AttrName->getName() == "property") {
533 // The property declspec is more complex in that it can take one or two
534 // assignment expressions as a parameter, but the lhs of the assignment
535 // must be named get or put.
536
537 BalancedDelimiterTracker T(*this, tok::l_paren);
538 T.expectAndConsume(diag::err_expected_lparen_after,
539 AttrName->getNameStart(), tok::r_paren);
540
541 enum AccessorKind {
542 AK_Invalid = -1,
543 AK_Put = 0,
544 AK_Get = 1 // indices into AccessorNames
545 };
546 IdentifierInfo *AccessorNames[] = {nullptr, nullptr};
547 bool HasInvalidAccessor = false;
548
549 // Parse the accessor specifications.
550 while (true) {
551 // Stop if this doesn't look like an accessor spec.
552 if (!Tok.is(tok::identifier)) {
553 // If the user wrote a completely empty list, use a special diagnostic.
554 if (Tok.is(tok::r_paren) && !HasInvalidAccessor &&
555 AccessorNames[AK_Put] == nullptr &&
556 AccessorNames[AK_Get] == nullptr) {
557 Diag(AttrNameLoc, diag::err_ms_property_no_getter_or_putter);
558 break;
559 }
560
561 Diag(Tok.getLocation(), diag::err_ms_property_unknown_accessor);
562 break;
563 }
564
565 AccessorKind Kind;
566 SourceLocation KindLoc = Tok.getLocation();
567 StringRef KindStr = Tok.getIdentifierInfo()->getName();
568 if (KindStr == "get") {
569 Kind = AK_Get;
570 } else if (KindStr == "put") {
571 Kind = AK_Put;
572
573 // Recover from the common mistake of using 'set' instead of 'put'.
574 } else if (KindStr == "set") {
575 Diag(KindLoc, diag::err_ms_property_has_set_accessor)
576 << FixItHint::CreateReplacement(KindLoc, "put");
577 Kind = AK_Put;
578
579 // Handle the mistake of forgetting the accessor kind by skipping
580 // this accessor.
581 } else if (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)) {
582 Diag(KindLoc, diag::err_ms_property_missing_accessor_kind);
583 ConsumeToken();
584 HasInvalidAccessor = true;
585 goto next_property_accessor;
586
587 // Otherwise, complain about the unknown accessor kind.
588 } else {
589 Diag(KindLoc, diag::err_ms_property_unknown_accessor);
590 HasInvalidAccessor = true;
591 Kind = AK_Invalid;
592
593 // Try to keep parsing unless it doesn't look like an accessor spec.
594 if (!NextToken().is(tok::equal))
595 break;
596 }
597
598 // Consume the identifier.
599 ConsumeToken();
600
601 // Consume the '='.
602 if (!TryConsumeToken(tok::equal)) {
603 Diag(Tok.getLocation(), diag::err_ms_property_expected_equal)
604 << KindStr;
605 break;
606 }
607
608 // Expect the method name.
609 if (!Tok.is(tok::identifier)) {
610 Diag(Tok.getLocation(), diag::err_ms_property_expected_accessor_name);
611 break;
612 }
613
614 if (Kind == AK_Invalid) {
615 // Just drop invalid accessors.
616 } else if (AccessorNames[Kind] != nullptr) {
617 // Complain about the repeated accessor, ignore it, and keep parsing.
618 Diag(KindLoc, diag::err_ms_property_duplicate_accessor) << KindStr;
619 } else {
620 AccessorNames[Kind] = Tok.getIdentifierInfo();
621 }
622 ConsumeToken();
623
624 next_property_accessor:
625 // Keep processing accessors until we run out.
626 if (TryConsumeToken(tok::comma))
627 continue;
628
629 // If we run into the ')', stop without consuming it.
630 if (Tok.is(tok::r_paren))
631 break;
632
633 Diag(Tok.getLocation(), diag::err_ms_property_expected_comma_or_rparen);
634 break;
635 }
636
637 // Only add the property attribute if it was well-formed.
638 if (!HasInvalidAccessor)
639 Attrs.addNewPropertyAttr(AttrName, AttrNameLoc, nullptr, SourceLocation(),
640 AccessorNames[AK_Get], AccessorNames[AK_Put],
641 ParsedAttr::AS_Declspec);
642 T.skipToEnd();
643 return !HasInvalidAccessor;
644 }
645
646 unsigned NumArgs =
647 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, nullptr, nullptr,
648 SourceLocation(), ParsedAttr::AS_Declspec);
649
650 // If this attribute's args were parsed, and it was expected to have
651 // arguments but none were provided, emit a diagnostic.
652 if (!Attrs.empty() && Attrs.begin()->getMaxArgs() && !NumArgs) {
653 Diag(OpenParenLoc, diag::err_attribute_requires_arguments) << AttrName;
654 return false;
655 }
656 return true;
657 }
658
659 /// [MS] decl-specifier:
660 /// __declspec ( extended-decl-modifier-seq )
661 ///
662 /// [MS] extended-decl-modifier-seq:
663 /// extended-decl-modifier[opt]
664 /// extended-decl-modifier extended-decl-modifier-seq
ParseMicrosoftDeclSpecs(ParsedAttributes & Attrs,SourceLocation * End)665 void Parser::ParseMicrosoftDeclSpecs(ParsedAttributes &Attrs,
666 SourceLocation *End) {
667 assert(getLangOpts().DeclSpecKeyword && "__declspec keyword is not enabled");
668 assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
669
670 while (Tok.is(tok::kw___declspec)) {
671 ConsumeToken();
672 BalancedDelimiterTracker T(*this, tok::l_paren);
673 if (T.expectAndConsume(diag::err_expected_lparen_after, "__declspec",
674 tok::r_paren))
675 return;
676
677 // An empty declspec is perfectly legal and should not warn. Additionally,
678 // you can specify multiple attributes per declspec.
679 while (Tok.isNot(tok::r_paren)) {
680 // Attribute not present.
681 if (TryConsumeToken(tok::comma))
682 continue;
683
684 // We expect either a well-known identifier or a generic string. Anything
685 // else is a malformed declspec.
686 bool IsString = Tok.getKind() == tok::string_literal;
687 if (!IsString && Tok.getKind() != tok::identifier &&
688 Tok.getKind() != tok::kw_restrict) {
689 Diag(Tok, diag::err_ms_declspec_type);
690 T.skipToEnd();
691 return;
692 }
693
694 IdentifierInfo *AttrName;
695 SourceLocation AttrNameLoc;
696 if (IsString) {
697 SmallString<8> StrBuffer;
698 bool Invalid = false;
699 StringRef Str = PP.getSpelling(Tok, StrBuffer, &Invalid);
700 if (Invalid) {
701 T.skipToEnd();
702 return;
703 }
704 AttrName = PP.getIdentifierInfo(Str);
705 AttrNameLoc = ConsumeStringToken();
706 } else {
707 AttrName = Tok.getIdentifierInfo();
708 AttrNameLoc = ConsumeToken();
709 }
710
711 bool AttrHandled = false;
712
713 // Parse attribute arguments.
714 if (Tok.is(tok::l_paren))
715 AttrHandled = ParseMicrosoftDeclSpecArgs(AttrName, AttrNameLoc, Attrs);
716 else if (AttrName->getName() == "property")
717 // The property attribute must have an argument list.
718 Diag(Tok.getLocation(), diag::err_expected_lparen_after)
719 << AttrName->getName();
720
721 if (!AttrHandled)
722 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
723 ParsedAttr::AS_Declspec);
724 }
725 T.consumeClose();
726 if (End)
727 *End = T.getCloseLocation();
728 }
729 }
730
ParseMicrosoftTypeAttributes(ParsedAttributes & attrs)731 void Parser::ParseMicrosoftTypeAttributes(ParsedAttributes &attrs) {
732 // Treat these like attributes
733 while (true) {
734 switch (Tok.getKind()) {
735 case tok::kw___fastcall:
736 case tok::kw___stdcall:
737 case tok::kw___thiscall:
738 case tok::kw___regcall:
739 case tok::kw___cdecl:
740 case tok::kw___vectorcall:
741 case tok::kw___ptr64:
742 case tok::kw___w64:
743 case tok::kw___ptr32:
744 case tok::kw___sptr:
745 case tok::kw___uptr: {
746 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
747 SourceLocation AttrNameLoc = ConsumeToken();
748 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
749 ParsedAttr::AS_Keyword);
750 break;
751 }
752 default:
753 return;
754 }
755 }
756 }
757
DiagnoseAndSkipExtendedMicrosoftTypeAttributes()758 void Parser::DiagnoseAndSkipExtendedMicrosoftTypeAttributes() {
759 SourceLocation StartLoc = Tok.getLocation();
760 SourceLocation EndLoc = SkipExtendedMicrosoftTypeAttributes();
761
762 if (EndLoc.isValid()) {
763 SourceRange Range(StartLoc, EndLoc);
764 Diag(StartLoc, diag::warn_microsoft_qualifiers_ignored) << Range;
765 }
766 }
767
SkipExtendedMicrosoftTypeAttributes()768 SourceLocation Parser::SkipExtendedMicrosoftTypeAttributes() {
769 SourceLocation EndLoc;
770
771 while (true) {
772 switch (Tok.getKind()) {
773 case tok::kw_const:
774 case tok::kw_volatile:
775 case tok::kw___fastcall:
776 case tok::kw___stdcall:
777 case tok::kw___thiscall:
778 case tok::kw___cdecl:
779 case tok::kw___vectorcall:
780 case tok::kw___ptr32:
781 case tok::kw___ptr64:
782 case tok::kw___w64:
783 case tok::kw___unaligned:
784 case tok::kw___sptr:
785 case tok::kw___uptr:
786 EndLoc = ConsumeToken();
787 break;
788 default:
789 return EndLoc;
790 }
791 }
792 }
793
ParseBorlandTypeAttributes(ParsedAttributes & attrs)794 void Parser::ParseBorlandTypeAttributes(ParsedAttributes &attrs) {
795 // Treat these like attributes
796 while (Tok.is(tok::kw___pascal)) {
797 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
798 SourceLocation AttrNameLoc = ConsumeToken();
799 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
800 ParsedAttr::AS_Keyword);
801 }
802 }
803
ParseOpenCLKernelAttributes(ParsedAttributes & attrs)804 void Parser::ParseOpenCLKernelAttributes(ParsedAttributes &attrs) {
805 // Treat these like attributes
806 while (Tok.is(tok::kw___kernel)) {
807 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
808 SourceLocation AttrNameLoc = ConsumeToken();
809 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
810 ParsedAttr::AS_Keyword);
811 }
812 }
813
ParseOpenCLQualifiers(ParsedAttributes & Attrs)814 void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) {
815 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
816 SourceLocation AttrNameLoc = Tok.getLocation();
817 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
818 ParsedAttr::AS_Keyword);
819 }
820
ParseNullabilityTypeSpecifiers(ParsedAttributes & attrs)821 void Parser::ParseNullabilityTypeSpecifiers(ParsedAttributes &attrs) {
822 // Treat these like attributes, even though they're type specifiers.
823 while (true) {
824 switch (Tok.getKind()) {
825 case tok::kw__Nonnull:
826 case tok::kw__Nullable:
827 case tok::kw__Null_unspecified: {
828 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
829 SourceLocation AttrNameLoc = ConsumeToken();
830 if (!getLangOpts().ObjC)
831 Diag(AttrNameLoc, diag::ext_nullability)
832 << AttrName;
833 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
834 ParsedAttr::AS_Keyword);
835 break;
836 }
837 default:
838 return;
839 }
840 }
841 }
842
VersionNumberSeparator(const char Separator)843 static bool VersionNumberSeparator(const char Separator) {
844 return (Separator == '.' || Separator == '_');
845 }
846
847 /// Parse a version number.
848 ///
849 /// version:
850 /// simple-integer
851 /// simple-integer '.' simple-integer
852 /// simple-integer '_' simple-integer
853 /// simple-integer '.' simple-integer '.' simple-integer
854 /// simple-integer '_' simple-integer '_' simple-integer
ParseVersionTuple(SourceRange & Range)855 VersionTuple Parser::ParseVersionTuple(SourceRange &Range) {
856 Range = SourceRange(Tok.getLocation(), Tok.getEndLoc());
857
858 if (!Tok.is(tok::numeric_constant)) {
859 Diag(Tok, diag::err_expected_version);
860 SkipUntil(tok::comma, tok::r_paren,
861 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
862 return VersionTuple();
863 }
864
865 // Parse the major (and possibly minor and subminor) versions, which
866 // are stored in the numeric constant. We utilize a quirk of the
867 // lexer, which is that it handles something like 1.2.3 as a single
868 // numeric constant, rather than two separate tokens.
869 SmallString<512> Buffer;
870 Buffer.resize(Tok.getLength()+1);
871 const char *ThisTokBegin = &Buffer[0];
872
873 // Get the spelling of the token, which eliminates trigraphs, etc.
874 bool Invalid = false;
875 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
876 if (Invalid)
877 return VersionTuple();
878
879 // Parse the major version.
880 unsigned AfterMajor = 0;
881 unsigned Major = 0;
882 while (AfterMajor < ActualLength && isDigit(ThisTokBegin[AfterMajor])) {
883 Major = Major * 10 + ThisTokBegin[AfterMajor] - '0';
884 ++AfterMajor;
885 }
886
887 if (AfterMajor == 0) {
888 Diag(Tok, diag::err_expected_version);
889 SkipUntil(tok::comma, tok::r_paren,
890 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
891 return VersionTuple();
892 }
893
894 if (AfterMajor == ActualLength) {
895 ConsumeToken();
896
897 // We only had a single version component.
898 if (Major == 0) {
899 Diag(Tok, diag::err_zero_version);
900 return VersionTuple();
901 }
902
903 return VersionTuple(Major);
904 }
905
906 const char AfterMajorSeparator = ThisTokBegin[AfterMajor];
907 if (!VersionNumberSeparator(AfterMajorSeparator)
908 || (AfterMajor + 1 == ActualLength)) {
909 Diag(Tok, diag::err_expected_version);
910 SkipUntil(tok::comma, tok::r_paren,
911 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
912 return VersionTuple();
913 }
914
915 // Parse the minor version.
916 unsigned AfterMinor = AfterMajor + 1;
917 unsigned Minor = 0;
918 while (AfterMinor < ActualLength && isDigit(ThisTokBegin[AfterMinor])) {
919 Minor = Minor * 10 + ThisTokBegin[AfterMinor] - '0';
920 ++AfterMinor;
921 }
922
923 if (AfterMinor == ActualLength) {
924 ConsumeToken();
925
926 // We had major.minor.
927 if (Major == 0 && Minor == 0) {
928 Diag(Tok, diag::err_zero_version);
929 return VersionTuple();
930 }
931
932 return VersionTuple(Major, Minor);
933 }
934
935 const char AfterMinorSeparator = ThisTokBegin[AfterMinor];
936 // If what follows is not a '.' or '_', we have a problem.
937 if (!VersionNumberSeparator(AfterMinorSeparator)) {
938 Diag(Tok, diag::err_expected_version);
939 SkipUntil(tok::comma, tok::r_paren,
940 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
941 return VersionTuple();
942 }
943
944 // Warn if separators, be it '.' or '_', do not match.
945 if (AfterMajorSeparator != AfterMinorSeparator)
946 Diag(Tok, diag::warn_expected_consistent_version_separator);
947
948 // Parse the subminor version.
949 unsigned AfterSubminor = AfterMinor + 1;
950 unsigned Subminor = 0;
951 while (AfterSubminor < ActualLength && isDigit(ThisTokBegin[AfterSubminor])) {
952 Subminor = Subminor * 10 + ThisTokBegin[AfterSubminor] - '0';
953 ++AfterSubminor;
954 }
955
956 if (AfterSubminor != ActualLength) {
957 Diag(Tok, diag::err_expected_version);
958 SkipUntil(tok::comma, tok::r_paren,
959 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
960 return VersionTuple();
961 }
962 ConsumeToken();
963 return VersionTuple(Major, Minor, Subminor);
964 }
965
966 /// Parse the contents of the "availability" attribute.
967 ///
968 /// availability-attribute:
969 /// 'availability' '(' platform ',' opt-strict version-arg-list,
970 /// opt-replacement, opt-message')'
971 ///
972 /// platform:
973 /// identifier
974 ///
975 /// opt-strict:
976 /// 'strict' ','
977 ///
978 /// version-arg-list:
979 /// version-arg
980 /// version-arg ',' version-arg-list
981 ///
982 /// version-arg:
983 /// 'introduced' '=' version
984 /// 'deprecated' '=' version
985 /// 'obsoleted' = version
986 /// 'unavailable'
987 /// opt-replacement:
988 /// 'replacement' '=' <string>
989 /// opt-message:
990 /// 'message' '=' <string>
ParseAvailabilityAttribute(IdentifierInfo & Availability,SourceLocation AvailabilityLoc,ParsedAttributes & attrs,SourceLocation * endLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)991 void Parser::ParseAvailabilityAttribute(IdentifierInfo &Availability,
992 SourceLocation AvailabilityLoc,
993 ParsedAttributes &attrs,
994 SourceLocation *endLoc,
995 IdentifierInfo *ScopeName,
996 SourceLocation ScopeLoc,
997 ParsedAttr::Syntax Syntax) {
998 enum { Introduced, Deprecated, Obsoleted, Unknown };
999 AvailabilityChange Changes[Unknown];
1000 ExprResult MessageExpr, ReplacementExpr;
1001
1002 // Opening '('.
1003 BalancedDelimiterTracker T(*this, tok::l_paren);
1004 if (T.consumeOpen()) {
1005 Diag(Tok, diag::err_expected) << tok::l_paren;
1006 return;
1007 }
1008
1009 // Parse the platform name.
1010 if (Tok.isNot(tok::identifier)) {
1011 Diag(Tok, diag::err_availability_expected_platform);
1012 SkipUntil(tok::r_paren, StopAtSemi);
1013 return;
1014 }
1015 IdentifierLoc *Platform = ParseIdentifierLoc();
1016 if (const IdentifierInfo *const Ident = Platform->Ident) {
1017 // Canonicalize platform name from "macosx" to "macos".
1018 if (Ident->getName() == "macosx")
1019 Platform->Ident = PP.getIdentifierInfo("macos");
1020 // Canonicalize platform name from "macosx_app_extension" to
1021 // "macos_app_extension".
1022 else if (Ident->getName() == "macosx_app_extension")
1023 Platform->Ident = PP.getIdentifierInfo("macos_app_extension");
1024 else
1025 Platform->Ident = PP.getIdentifierInfo(
1026 AvailabilityAttr::canonicalizePlatformName(Ident->getName()));
1027 }
1028
1029 // Parse the ',' following the platform name.
1030 if (ExpectAndConsume(tok::comma)) {
1031 SkipUntil(tok::r_paren, StopAtSemi);
1032 return;
1033 }
1034
1035 // If we haven't grabbed the pointers for the identifiers
1036 // "introduced", "deprecated", and "obsoleted", do so now.
1037 if (!Ident_introduced) {
1038 Ident_introduced = PP.getIdentifierInfo("introduced");
1039 Ident_deprecated = PP.getIdentifierInfo("deprecated");
1040 Ident_obsoleted = PP.getIdentifierInfo("obsoleted");
1041 Ident_unavailable = PP.getIdentifierInfo("unavailable");
1042 Ident_message = PP.getIdentifierInfo("message");
1043 Ident_strict = PP.getIdentifierInfo("strict");
1044 Ident_replacement = PP.getIdentifierInfo("replacement");
1045 }
1046
1047 // Parse the optional "strict", the optional "replacement" and the set of
1048 // introductions/deprecations/removals.
1049 SourceLocation UnavailableLoc, StrictLoc;
1050 do {
1051 if (Tok.isNot(tok::identifier)) {
1052 Diag(Tok, diag::err_availability_expected_change);
1053 SkipUntil(tok::r_paren, StopAtSemi);
1054 return;
1055 }
1056 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1057 SourceLocation KeywordLoc = ConsumeToken();
1058
1059 if (Keyword == Ident_strict) {
1060 if (StrictLoc.isValid()) {
1061 Diag(KeywordLoc, diag::err_availability_redundant)
1062 << Keyword << SourceRange(StrictLoc);
1063 }
1064 StrictLoc = KeywordLoc;
1065 continue;
1066 }
1067
1068 if (Keyword == Ident_unavailable) {
1069 if (UnavailableLoc.isValid()) {
1070 Diag(KeywordLoc, diag::err_availability_redundant)
1071 << Keyword << SourceRange(UnavailableLoc);
1072 }
1073 UnavailableLoc = KeywordLoc;
1074 continue;
1075 }
1076
1077 if (Keyword == Ident_deprecated && Platform->Ident &&
1078 Platform->Ident->isStr("swift")) {
1079 // For swift, we deprecate for all versions.
1080 if (Changes[Deprecated].KeywordLoc.isValid()) {
1081 Diag(KeywordLoc, diag::err_availability_redundant)
1082 << Keyword
1083 << SourceRange(Changes[Deprecated].KeywordLoc);
1084 }
1085
1086 Changes[Deprecated].KeywordLoc = KeywordLoc;
1087 // Use a fake version here.
1088 Changes[Deprecated].Version = VersionTuple(1);
1089 continue;
1090 }
1091
1092 if (Tok.isNot(tok::equal)) {
1093 Diag(Tok, diag::err_expected_after) << Keyword << tok::equal;
1094 SkipUntil(tok::r_paren, StopAtSemi);
1095 return;
1096 }
1097 ConsumeToken();
1098 if (Keyword == Ident_message || Keyword == Ident_replacement) {
1099 if (Tok.isNot(tok::string_literal)) {
1100 Diag(Tok, diag::err_expected_string_literal)
1101 << /*Source='availability attribute'*/2;
1102 SkipUntil(tok::r_paren, StopAtSemi);
1103 return;
1104 }
1105 if (Keyword == Ident_message)
1106 MessageExpr = ParseStringLiteralExpression();
1107 else
1108 ReplacementExpr = ParseStringLiteralExpression();
1109 // Also reject wide string literals.
1110 if (StringLiteral *MessageStringLiteral =
1111 cast_or_null<StringLiteral>(MessageExpr.get())) {
1112 if (MessageStringLiteral->getCharByteWidth() != 1) {
1113 Diag(MessageStringLiteral->getSourceRange().getBegin(),
1114 diag::err_expected_string_literal)
1115 << /*Source='availability attribute'*/ 2;
1116 SkipUntil(tok::r_paren, StopAtSemi);
1117 return;
1118 }
1119 }
1120 if (Keyword == Ident_message)
1121 break;
1122 else
1123 continue;
1124 }
1125
1126 // Special handling of 'NA' only when applied to introduced or
1127 // deprecated.
1128 if ((Keyword == Ident_introduced || Keyword == Ident_deprecated) &&
1129 Tok.is(tok::identifier)) {
1130 IdentifierInfo *NA = Tok.getIdentifierInfo();
1131 if (NA->getName() == "NA") {
1132 ConsumeToken();
1133 if (Keyword == Ident_introduced)
1134 UnavailableLoc = KeywordLoc;
1135 continue;
1136 }
1137 }
1138
1139 SourceRange VersionRange;
1140 VersionTuple Version = ParseVersionTuple(VersionRange);
1141
1142 if (Version.empty()) {
1143 SkipUntil(tok::r_paren, StopAtSemi);
1144 return;
1145 }
1146
1147 unsigned Index;
1148 if (Keyword == Ident_introduced)
1149 Index = Introduced;
1150 else if (Keyword == Ident_deprecated)
1151 Index = Deprecated;
1152 else if (Keyword == Ident_obsoleted)
1153 Index = Obsoleted;
1154 else
1155 Index = Unknown;
1156
1157 if (Index < Unknown) {
1158 if (!Changes[Index].KeywordLoc.isInvalid()) {
1159 Diag(KeywordLoc, diag::err_availability_redundant)
1160 << Keyword
1161 << SourceRange(Changes[Index].KeywordLoc,
1162 Changes[Index].VersionRange.getEnd());
1163 }
1164
1165 Changes[Index].KeywordLoc = KeywordLoc;
1166 Changes[Index].Version = Version;
1167 Changes[Index].VersionRange = VersionRange;
1168 } else {
1169 Diag(KeywordLoc, diag::err_availability_unknown_change)
1170 << Keyword << VersionRange;
1171 }
1172
1173 } while (TryConsumeToken(tok::comma));
1174
1175 // Closing ')'.
1176 if (T.consumeClose())
1177 return;
1178
1179 if (endLoc)
1180 *endLoc = T.getCloseLocation();
1181
1182 // The 'unavailable' availability cannot be combined with any other
1183 // availability changes. Make sure that hasn't happened.
1184 if (UnavailableLoc.isValid()) {
1185 bool Complained = false;
1186 for (unsigned Index = Introduced; Index != Unknown; ++Index) {
1187 if (Changes[Index].KeywordLoc.isValid()) {
1188 if (!Complained) {
1189 Diag(UnavailableLoc, diag::warn_availability_and_unavailable)
1190 << SourceRange(Changes[Index].KeywordLoc,
1191 Changes[Index].VersionRange.getEnd());
1192 Complained = true;
1193 }
1194
1195 // Clear out the availability.
1196 Changes[Index] = AvailabilityChange();
1197 }
1198 }
1199 }
1200
1201 // Record this attribute
1202 attrs.addNew(&Availability,
1203 SourceRange(AvailabilityLoc, T.getCloseLocation()),
1204 ScopeName, ScopeLoc,
1205 Platform,
1206 Changes[Introduced],
1207 Changes[Deprecated],
1208 Changes[Obsoleted],
1209 UnavailableLoc, MessageExpr.get(),
1210 Syntax, StrictLoc, ReplacementExpr.get());
1211 }
1212
1213 /// Parse the contents of the "external_source_symbol" attribute.
1214 ///
1215 /// external-source-symbol-attribute:
1216 /// 'external_source_symbol' '(' keyword-arg-list ')'
1217 ///
1218 /// keyword-arg-list:
1219 /// keyword-arg
1220 /// keyword-arg ',' keyword-arg-list
1221 ///
1222 /// keyword-arg:
1223 /// 'language' '=' <string>
1224 /// 'defined_in' '=' <string>
1225 /// 'generated_declaration'
ParseExternalSourceSymbolAttribute(IdentifierInfo & ExternalSourceSymbol,SourceLocation Loc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1226 void Parser::ParseExternalSourceSymbolAttribute(
1227 IdentifierInfo &ExternalSourceSymbol, SourceLocation Loc,
1228 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1229 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
1230 // Opening '('.
1231 BalancedDelimiterTracker T(*this, tok::l_paren);
1232 if (T.expectAndConsume())
1233 return;
1234
1235 // Initialize the pointers for the keyword identifiers when required.
1236 if (!Ident_language) {
1237 Ident_language = PP.getIdentifierInfo("language");
1238 Ident_defined_in = PP.getIdentifierInfo("defined_in");
1239 Ident_generated_declaration = PP.getIdentifierInfo("generated_declaration");
1240 }
1241
1242 ExprResult Language;
1243 bool HasLanguage = false;
1244 ExprResult DefinedInExpr;
1245 bool HasDefinedIn = false;
1246 IdentifierLoc *GeneratedDeclaration = nullptr;
1247
1248 // Parse the language/defined_in/generated_declaration keywords
1249 do {
1250 if (Tok.isNot(tok::identifier)) {
1251 Diag(Tok, diag::err_external_source_symbol_expected_keyword);
1252 SkipUntil(tok::r_paren, StopAtSemi);
1253 return;
1254 }
1255
1256 SourceLocation KeywordLoc = Tok.getLocation();
1257 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1258 if (Keyword == Ident_generated_declaration) {
1259 if (GeneratedDeclaration) {
1260 Diag(Tok, diag::err_external_source_symbol_duplicate_clause) << Keyword;
1261 SkipUntil(tok::r_paren, StopAtSemi);
1262 return;
1263 }
1264 GeneratedDeclaration = ParseIdentifierLoc();
1265 continue;
1266 }
1267
1268 if (Keyword != Ident_language && Keyword != Ident_defined_in) {
1269 Diag(Tok, diag::err_external_source_symbol_expected_keyword);
1270 SkipUntil(tok::r_paren, StopAtSemi);
1271 return;
1272 }
1273
1274 ConsumeToken();
1275 if (ExpectAndConsume(tok::equal, diag::err_expected_after,
1276 Keyword->getName())) {
1277 SkipUntil(tok::r_paren, StopAtSemi);
1278 return;
1279 }
1280
1281 bool HadLanguage = HasLanguage, HadDefinedIn = HasDefinedIn;
1282 if (Keyword == Ident_language)
1283 HasLanguage = true;
1284 else
1285 HasDefinedIn = true;
1286
1287 if (Tok.isNot(tok::string_literal)) {
1288 Diag(Tok, diag::err_expected_string_literal)
1289 << /*Source='external_source_symbol attribute'*/ 3
1290 << /*language | source container*/ (Keyword != Ident_language);
1291 SkipUntil(tok::comma, tok::r_paren, StopAtSemi | StopBeforeMatch);
1292 continue;
1293 }
1294 if (Keyword == Ident_language) {
1295 if (HadLanguage) {
1296 Diag(KeywordLoc, diag::err_external_source_symbol_duplicate_clause)
1297 << Keyword;
1298 ParseStringLiteralExpression();
1299 continue;
1300 }
1301 Language = ParseStringLiteralExpression();
1302 } else {
1303 assert(Keyword == Ident_defined_in && "Invalid clause keyword!");
1304 if (HadDefinedIn) {
1305 Diag(KeywordLoc, diag::err_external_source_symbol_duplicate_clause)
1306 << Keyword;
1307 ParseStringLiteralExpression();
1308 continue;
1309 }
1310 DefinedInExpr = ParseStringLiteralExpression();
1311 }
1312 } while (TryConsumeToken(tok::comma));
1313
1314 // Closing ')'.
1315 if (T.consumeClose())
1316 return;
1317 if (EndLoc)
1318 *EndLoc = T.getCloseLocation();
1319
1320 ArgsUnion Args[] = {Language.get(), DefinedInExpr.get(),
1321 GeneratedDeclaration};
1322 Attrs.addNew(&ExternalSourceSymbol, SourceRange(Loc, T.getCloseLocation()),
1323 ScopeName, ScopeLoc, Args, llvm::array_lengthof(Args), Syntax);
1324 }
1325
1326 /// Parse the contents of the "objc_bridge_related" attribute.
1327 /// objc_bridge_related '(' related_class ',' opt-class_method ',' opt-instance_method ')'
1328 /// related_class:
1329 /// Identifier
1330 ///
1331 /// opt-class_method:
1332 /// Identifier: | <empty>
1333 ///
1334 /// opt-instance_method:
1335 /// Identifier | <empty>
1336 ///
ParseObjCBridgeRelatedAttribute(IdentifierInfo & ObjCBridgeRelated,SourceLocation ObjCBridgeRelatedLoc,ParsedAttributes & attrs,SourceLocation * endLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1337 void Parser::ParseObjCBridgeRelatedAttribute(IdentifierInfo &ObjCBridgeRelated,
1338 SourceLocation ObjCBridgeRelatedLoc,
1339 ParsedAttributes &attrs,
1340 SourceLocation *endLoc,
1341 IdentifierInfo *ScopeName,
1342 SourceLocation ScopeLoc,
1343 ParsedAttr::Syntax Syntax) {
1344 // Opening '('.
1345 BalancedDelimiterTracker T(*this, tok::l_paren);
1346 if (T.consumeOpen()) {
1347 Diag(Tok, diag::err_expected) << tok::l_paren;
1348 return;
1349 }
1350
1351 // Parse the related class name.
1352 if (Tok.isNot(tok::identifier)) {
1353 Diag(Tok, diag::err_objcbridge_related_expected_related_class);
1354 SkipUntil(tok::r_paren, StopAtSemi);
1355 return;
1356 }
1357 IdentifierLoc *RelatedClass = ParseIdentifierLoc();
1358 if (ExpectAndConsume(tok::comma)) {
1359 SkipUntil(tok::r_paren, StopAtSemi);
1360 return;
1361 }
1362
1363 // Parse class method name. It's non-optional in the sense that a trailing
1364 // comma is required, but it can be the empty string, and then we record a
1365 // nullptr.
1366 IdentifierLoc *ClassMethod = nullptr;
1367 if (Tok.is(tok::identifier)) {
1368 ClassMethod = ParseIdentifierLoc();
1369 if (!TryConsumeToken(tok::colon)) {
1370 Diag(Tok, diag::err_objcbridge_related_selector_name);
1371 SkipUntil(tok::r_paren, StopAtSemi);
1372 return;
1373 }
1374 }
1375 if (!TryConsumeToken(tok::comma)) {
1376 if (Tok.is(tok::colon))
1377 Diag(Tok, diag::err_objcbridge_related_selector_name);
1378 else
1379 Diag(Tok, diag::err_expected) << tok::comma;
1380 SkipUntil(tok::r_paren, StopAtSemi);
1381 return;
1382 }
1383
1384 // Parse instance method name. Also non-optional but empty string is
1385 // permitted.
1386 IdentifierLoc *InstanceMethod = nullptr;
1387 if (Tok.is(tok::identifier))
1388 InstanceMethod = ParseIdentifierLoc();
1389 else if (Tok.isNot(tok::r_paren)) {
1390 Diag(Tok, diag::err_expected) << tok::r_paren;
1391 SkipUntil(tok::r_paren, StopAtSemi);
1392 return;
1393 }
1394
1395 // Closing ')'.
1396 if (T.consumeClose())
1397 return;
1398
1399 if (endLoc)
1400 *endLoc = T.getCloseLocation();
1401
1402 // Record this attribute
1403 attrs.addNew(&ObjCBridgeRelated,
1404 SourceRange(ObjCBridgeRelatedLoc, T.getCloseLocation()),
1405 ScopeName, ScopeLoc,
1406 RelatedClass,
1407 ClassMethod,
1408 InstanceMethod,
1409 Syntax);
1410 }
1411
ParseTypeTagForDatatypeAttribute(IdentifierInfo & AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1412 void Parser::ParseTypeTagForDatatypeAttribute(IdentifierInfo &AttrName,
1413 SourceLocation AttrNameLoc,
1414 ParsedAttributes &Attrs,
1415 SourceLocation *EndLoc,
1416 IdentifierInfo *ScopeName,
1417 SourceLocation ScopeLoc,
1418 ParsedAttr::Syntax Syntax) {
1419 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
1420
1421 BalancedDelimiterTracker T(*this, tok::l_paren);
1422 T.consumeOpen();
1423
1424 if (Tok.isNot(tok::identifier)) {
1425 Diag(Tok, diag::err_expected) << tok::identifier;
1426 T.skipToEnd();
1427 return;
1428 }
1429 IdentifierLoc *ArgumentKind = ParseIdentifierLoc();
1430
1431 if (ExpectAndConsume(tok::comma)) {
1432 T.skipToEnd();
1433 return;
1434 }
1435
1436 SourceRange MatchingCTypeRange;
1437 TypeResult MatchingCType = ParseTypeName(&MatchingCTypeRange);
1438 if (MatchingCType.isInvalid()) {
1439 T.skipToEnd();
1440 return;
1441 }
1442
1443 bool LayoutCompatible = false;
1444 bool MustBeNull = false;
1445 while (TryConsumeToken(tok::comma)) {
1446 if (Tok.isNot(tok::identifier)) {
1447 Diag(Tok, diag::err_expected) << tok::identifier;
1448 T.skipToEnd();
1449 return;
1450 }
1451 IdentifierInfo *Flag = Tok.getIdentifierInfo();
1452 if (Flag->isStr("layout_compatible"))
1453 LayoutCompatible = true;
1454 else if (Flag->isStr("must_be_null"))
1455 MustBeNull = true;
1456 else {
1457 Diag(Tok, diag::err_type_safety_unknown_flag) << Flag;
1458 T.skipToEnd();
1459 return;
1460 }
1461 ConsumeToken(); // consume flag
1462 }
1463
1464 if (!T.consumeClose()) {
1465 Attrs.addNewTypeTagForDatatype(&AttrName, AttrNameLoc, ScopeName, ScopeLoc,
1466 ArgumentKind, MatchingCType.get(),
1467 LayoutCompatible, MustBeNull, Syntax);
1468 }
1469
1470 if (EndLoc)
1471 *EndLoc = T.getCloseLocation();
1472 }
1473
1474 /// DiagnoseProhibitedCXX11Attribute - We have found the opening square brackets
1475 /// of a C++11 attribute-specifier in a location where an attribute is not
1476 /// permitted. By C++11 [dcl.attr.grammar]p6, this is ill-formed. Diagnose this
1477 /// situation.
1478 ///
1479 /// \return \c true if we skipped an attribute-like chunk of tokens, \c false if
1480 /// this doesn't appear to actually be an attribute-specifier, and the caller
1481 /// should try to parse it.
DiagnoseProhibitedCXX11Attribute()1482 bool Parser::DiagnoseProhibitedCXX11Attribute() {
1483 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square));
1484
1485 switch (isCXX11AttributeSpecifier(/*Disambiguate*/true)) {
1486 case CAK_NotAttributeSpecifier:
1487 // No diagnostic: we're in Obj-C++11 and this is not actually an attribute.
1488 return false;
1489
1490 case CAK_InvalidAttributeSpecifier:
1491 Diag(Tok.getLocation(), diag::err_l_square_l_square_not_attribute);
1492 return false;
1493
1494 case CAK_AttributeSpecifier:
1495 // Parse and discard the attributes.
1496 SourceLocation BeginLoc = ConsumeBracket();
1497 ConsumeBracket();
1498 SkipUntil(tok::r_square);
1499 assert(Tok.is(tok::r_square) && "isCXX11AttributeSpecifier lied");
1500 SourceLocation EndLoc = ConsumeBracket();
1501 Diag(BeginLoc, diag::err_attributes_not_allowed)
1502 << SourceRange(BeginLoc, EndLoc);
1503 return true;
1504 }
1505 llvm_unreachable("All cases handled above.");
1506 }
1507
1508 /// We have found the opening square brackets of a C++11
1509 /// attribute-specifier in a location where an attribute is not permitted, but
1510 /// we know where the attributes ought to be written. Parse them anyway, and
1511 /// provide a fixit moving them to the right place.
DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange & Attrs,SourceLocation CorrectLocation)1512 void Parser::DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange &Attrs,
1513 SourceLocation CorrectLocation) {
1514 assert((Tok.is(tok::l_square) && NextToken().is(tok::l_square)) ||
1515 Tok.is(tok::kw_alignas));
1516
1517 // Consume the attributes.
1518 SourceLocation Loc = Tok.getLocation();
1519 ParseCXX11Attributes(Attrs);
1520 CharSourceRange AttrRange(SourceRange(Loc, Attrs.Range.getEnd()), true);
1521 // FIXME: use err_attributes_misplaced
1522 Diag(Loc, diag::err_attributes_not_allowed)
1523 << FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange)
1524 << FixItHint::CreateRemoval(AttrRange);
1525 }
1526
DiagnoseProhibitedAttributes(const SourceRange & Range,const SourceLocation CorrectLocation)1527 void Parser::DiagnoseProhibitedAttributes(
1528 const SourceRange &Range, const SourceLocation CorrectLocation) {
1529 if (CorrectLocation.isValid()) {
1530 CharSourceRange AttrRange(Range, true);
1531 Diag(CorrectLocation, diag::err_attributes_misplaced)
1532 << FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange)
1533 << FixItHint::CreateRemoval(AttrRange);
1534 } else
1535 Diag(Range.getBegin(), diag::err_attributes_not_allowed) << Range;
1536 }
1537
ProhibitCXX11Attributes(ParsedAttributesWithRange & Attrs,unsigned DiagID)1538 void Parser::ProhibitCXX11Attributes(ParsedAttributesWithRange &Attrs,
1539 unsigned DiagID) {
1540 for (const ParsedAttr &AL : Attrs) {
1541 if (!AL.isCXX11Attribute() && !AL.isC2xAttribute())
1542 continue;
1543 if (AL.getKind() == ParsedAttr::UnknownAttribute)
1544 Diag(AL.getLoc(), diag::warn_unknown_attribute_ignored) << AL;
1545 else {
1546 Diag(AL.getLoc(), DiagID) << AL;
1547 AL.setInvalid();
1548 }
1549 }
1550 }
1551
1552 // Usually, `__attribute__((attrib)) class Foo {} var` means that attribute
1553 // applies to var, not the type Foo.
1554 // As an exception to the rule, __declspec(align(...)) before the
1555 // class-key affects the type instead of the variable.
1556 // Also, Microsoft-style [attributes] seem to affect the type instead of the
1557 // variable.
1558 // This function moves attributes that should apply to the type off DS to Attrs.
stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange & Attrs,DeclSpec & DS,Sema::TagUseKind TUK)1559 void Parser::stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange &Attrs,
1560 DeclSpec &DS,
1561 Sema::TagUseKind TUK) {
1562 if (TUK == Sema::TUK_Reference)
1563 return;
1564
1565 llvm::SmallVector<ParsedAttr *, 1> ToBeMoved;
1566
1567 for (ParsedAttr &AL : DS.getAttributes()) {
1568 if ((AL.getKind() == ParsedAttr::AT_Aligned &&
1569 AL.isDeclspecAttribute()) ||
1570 AL.isMicrosoftAttribute())
1571 ToBeMoved.push_back(&AL);
1572 }
1573
1574 for (ParsedAttr *AL : ToBeMoved) {
1575 DS.getAttributes().remove(AL);
1576 Attrs.addAtEnd(AL);
1577 }
1578 }
1579
1580 /// ParseDeclaration - Parse a full 'declaration', which consists of
1581 /// declaration-specifiers, some number of declarators, and a semicolon.
1582 /// 'Context' should be a DeclaratorContext value. This returns the
1583 /// location of the semicolon in DeclEnd.
1584 ///
1585 /// declaration: [C99 6.7]
1586 /// block-declaration ->
1587 /// simple-declaration
1588 /// others [FIXME]
1589 /// [C++] template-declaration
1590 /// [C++] namespace-definition
1591 /// [C++] using-directive
1592 /// [C++] using-declaration
1593 /// [C++11/C11] static_assert-declaration
1594 /// others... [FIXME]
1595 ///
1596 Parser::DeclGroupPtrTy
ParseDeclaration(DeclaratorContext Context,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,SourceLocation * DeclSpecStart)1597 Parser::ParseDeclaration(DeclaratorContext Context, SourceLocation &DeclEnd,
1598 ParsedAttributesWithRange &attrs,
1599 SourceLocation *DeclSpecStart) {
1600 ParenBraceBracketBalancer BalancerRAIIObj(*this);
1601 // Must temporarily exit the objective-c container scope for
1602 // parsing c none objective-c decls.
1603 ObjCDeclContextSwitch ObjCDC(*this);
1604
1605 Decl *SingleDecl = nullptr;
1606 switch (Tok.getKind()) {
1607 case tok::kw_template:
1608 case tok::kw_export:
1609 ProhibitAttributes(attrs);
1610 SingleDecl = ParseDeclarationStartingWithTemplate(Context, DeclEnd, attrs);
1611 break;
1612 case tok::kw_inline:
1613 // Could be the start of an inline namespace. Allowed as an ext in C++03.
1614 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_namespace)) {
1615 ProhibitAttributes(attrs);
1616 SourceLocation InlineLoc = ConsumeToken();
1617 return ParseNamespace(Context, DeclEnd, InlineLoc);
1618 }
1619 return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
1620 DeclSpecStart);
1621 case tok::kw_namespace:
1622 ProhibitAttributes(attrs);
1623 return ParseNamespace(Context, DeclEnd);
1624 case tok::kw_using:
1625 return ParseUsingDirectiveOrDeclaration(Context, ParsedTemplateInfo(),
1626 DeclEnd, attrs);
1627 case tok::kw_static_assert:
1628 case tok::kw__Static_assert:
1629 ProhibitAttributes(attrs);
1630 SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
1631 break;
1632 default:
1633 return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
1634 DeclSpecStart);
1635 }
1636
1637 // This routine returns a DeclGroup, if the thing we parsed only contains a
1638 // single decl, convert it now.
1639 return Actions.ConvertDeclToDeclGroup(SingleDecl);
1640 }
1641
1642 /// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
1643 /// declaration-specifiers init-declarator-list[opt] ';'
1644 /// [C++11] attribute-specifier-seq decl-specifier-seq[opt]
1645 /// init-declarator-list ';'
1646 ///[C90/C++]init-declarator-list ';' [TODO]
1647 /// [OMP] threadprivate-directive
1648 /// [OMP] allocate-directive [TODO]
1649 ///
1650 /// for-range-declaration: [C++11 6.5p1: stmt.ranged]
1651 /// attribute-specifier-seq[opt] type-specifier-seq declarator
1652 ///
1653 /// If RequireSemi is false, this does not check for a ';' at the end of the
1654 /// declaration. If it is true, it checks for and eats it.
1655 ///
1656 /// If FRI is non-null, we might be parsing a for-range-declaration instead
1657 /// of a simple-declaration. If we find that we are, we also parse the
1658 /// for-range-initializer, and place it here.
1659 ///
1660 /// DeclSpecStart is used when decl-specifiers are parsed before parsing
1661 /// the Declaration. The SourceLocation for this Decl is set to
1662 /// DeclSpecStart if DeclSpecStart is non-null.
ParseSimpleDeclaration(DeclaratorContext Context,SourceLocation & DeclEnd,ParsedAttributesWithRange & Attrs,bool RequireSemi,ForRangeInit * FRI,SourceLocation * DeclSpecStart)1663 Parser::DeclGroupPtrTy Parser::ParseSimpleDeclaration(
1664 DeclaratorContext Context, SourceLocation &DeclEnd,
1665 ParsedAttributesWithRange &Attrs, bool RequireSemi, ForRangeInit *FRI,
1666 SourceLocation *DeclSpecStart) {
1667 // Parse the common declaration-specifiers piece.
1668 ParsingDeclSpec DS(*this);
1669
1670 DeclSpecContext DSContext = getDeclSpecContextFromDeclaratorContext(Context);
1671 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none, DSContext);
1672
1673 // If we had a free-standing type definition with a missing semicolon, we
1674 // may get this far before the problem becomes obvious.
1675 if (DS.hasTagDefinition() &&
1676 DiagnoseMissingSemiAfterTagDefinition(DS, AS_none, DSContext))
1677 return nullptr;
1678
1679 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1680 // declaration-specifiers init-declarator-list[opt] ';'
1681 if (Tok.is(tok::semi)) {
1682 ProhibitAttributes(Attrs);
1683 DeclEnd = Tok.getLocation();
1684 if (RequireSemi) ConsumeToken();
1685 RecordDecl *AnonRecord = nullptr;
1686 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
1687 DS, AnonRecord);
1688 DS.complete(TheDecl);
1689 if (AnonRecord) {
1690 Decl* decls[] = {AnonRecord, TheDecl};
1691 return Actions.BuildDeclaratorGroup(decls);
1692 }
1693 return Actions.ConvertDeclToDeclGroup(TheDecl);
1694 }
1695
1696 if (DeclSpecStart)
1697 DS.SetRangeStart(*DeclSpecStart);
1698
1699 DS.takeAttributesFrom(Attrs);
1700 return ParseDeclGroup(DS, Context, &DeclEnd, FRI);
1701 }
1702
1703 /// Returns true if this might be the start of a declarator, or a common typo
1704 /// for a declarator.
MightBeDeclarator(DeclaratorContext Context)1705 bool Parser::MightBeDeclarator(DeclaratorContext Context) {
1706 switch (Tok.getKind()) {
1707 case tok::annot_cxxscope:
1708 case tok::annot_template_id:
1709 case tok::caret:
1710 case tok::code_completion:
1711 case tok::coloncolon:
1712 case tok::ellipsis:
1713 case tok::kw___attribute:
1714 case tok::kw_operator:
1715 case tok::l_paren:
1716 case tok::star:
1717 return true;
1718
1719 case tok::amp:
1720 case tok::ampamp:
1721 return getLangOpts().CPlusPlus;
1722
1723 case tok::l_square: // Might be an attribute on an unnamed bit-field.
1724 return Context == DeclaratorContext::MemberContext &&
1725 getLangOpts().CPlusPlus11 && NextToken().is(tok::l_square);
1726
1727 case tok::colon: // Might be a typo for '::' or an unnamed bit-field.
1728 return Context == DeclaratorContext::MemberContext ||
1729 getLangOpts().CPlusPlus;
1730
1731 case tok::identifier:
1732 switch (NextToken().getKind()) {
1733 case tok::code_completion:
1734 case tok::coloncolon:
1735 case tok::comma:
1736 case tok::equal:
1737 case tok::equalequal: // Might be a typo for '='.
1738 case tok::kw_alignas:
1739 case tok::kw_asm:
1740 case tok::kw___attribute:
1741 case tok::l_brace:
1742 case tok::l_paren:
1743 case tok::l_square:
1744 case tok::less:
1745 case tok::r_brace:
1746 case tok::r_paren:
1747 case tok::r_square:
1748 case tok::semi:
1749 return true;
1750
1751 case tok::colon:
1752 // At namespace scope, 'identifier:' is probably a typo for 'identifier::'
1753 // and in block scope it's probably a label. Inside a class definition,
1754 // this is a bit-field.
1755 return Context == DeclaratorContext::MemberContext ||
1756 (getLangOpts().CPlusPlus &&
1757 Context == DeclaratorContext::FileContext);
1758
1759 case tok::identifier: // Possible virt-specifier.
1760 return getLangOpts().CPlusPlus11 && isCXX11VirtSpecifier(NextToken());
1761
1762 default:
1763 return false;
1764 }
1765
1766 default:
1767 return false;
1768 }
1769 }
1770
1771 /// Skip until we reach something which seems like a sensible place to pick
1772 /// up parsing after a malformed declaration. This will sometimes stop sooner
1773 /// than SkipUntil(tok::r_brace) would, but will never stop later.
SkipMalformedDecl()1774 void Parser::SkipMalformedDecl() {
1775 while (true) {
1776 switch (Tok.getKind()) {
1777 case tok::l_brace:
1778 // Skip until matching }, then stop. We've probably skipped over
1779 // a malformed class or function definition or similar.
1780 ConsumeBrace();
1781 SkipUntil(tok::r_brace);
1782 if (Tok.isOneOf(tok::comma, tok::l_brace, tok::kw_try)) {
1783 // This declaration isn't over yet. Keep skipping.
1784 continue;
1785 }
1786 TryConsumeToken(tok::semi);
1787 return;
1788
1789 case tok::l_square:
1790 ConsumeBracket();
1791 SkipUntil(tok::r_square);
1792 continue;
1793
1794 case tok::l_paren:
1795 ConsumeParen();
1796 SkipUntil(tok::r_paren);
1797 continue;
1798
1799 case tok::r_brace:
1800 return;
1801
1802 case tok::semi:
1803 ConsumeToken();
1804 return;
1805
1806 case tok::kw_inline:
1807 // 'inline namespace' at the start of a line is almost certainly
1808 // a good place to pick back up parsing, except in an Objective-C
1809 // @interface context.
1810 if (Tok.isAtStartOfLine() && NextToken().is(tok::kw_namespace) &&
1811 (!ParsingInObjCContainer || CurParsedObjCImpl))
1812 return;
1813 break;
1814
1815 case tok::kw_namespace:
1816 // 'namespace' at the start of a line is almost certainly a good
1817 // place to pick back up parsing, except in an Objective-C
1818 // @interface context.
1819 if (Tok.isAtStartOfLine() &&
1820 (!ParsingInObjCContainer || CurParsedObjCImpl))
1821 return;
1822 break;
1823
1824 case tok::at:
1825 // @end is very much like } in Objective-C contexts.
1826 if (NextToken().isObjCAtKeyword(tok::objc_end) &&
1827 ParsingInObjCContainer)
1828 return;
1829 break;
1830
1831 case tok::minus:
1832 case tok::plus:
1833 // - and + probably start new method declarations in Objective-C contexts.
1834 if (Tok.isAtStartOfLine() && ParsingInObjCContainer)
1835 return;
1836 break;
1837
1838 case tok::eof:
1839 case tok::annot_module_begin:
1840 case tok::annot_module_end:
1841 case tok::annot_module_include:
1842 return;
1843
1844 default:
1845 break;
1846 }
1847
1848 ConsumeAnyToken();
1849 }
1850 }
1851
1852 /// ParseDeclGroup - Having concluded that this is either a function
1853 /// definition or a group of object declarations, actually parse the
1854 /// result.
ParseDeclGroup(ParsingDeclSpec & DS,DeclaratorContext Context,SourceLocation * DeclEnd,ForRangeInit * FRI)1855 Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS,
1856 DeclaratorContext Context,
1857 SourceLocation *DeclEnd,
1858 ForRangeInit *FRI) {
1859 // Parse the first declarator.
1860 ParsingDeclarator D(*this, DS, Context);
1861 ParseDeclarator(D);
1862
1863 // Bail out if the first declarator didn't seem well-formed.
1864 if (!D.hasName() && !D.mayOmitIdentifier()) {
1865 SkipMalformedDecl();
1866 return nullptr;
1867 }
1868
1869 if (Tok.is(tok::kw_requires))
1870 ParseTrailingRequiresClause(D);
1871
1872 // Save late-parsed attributes for now; they need to be parsed in the
1873 // appropriate function scope after the function Decl has been constructed.
1874 // These will be parsed in ParseFunctionDefinition or ParseLexedAttrList.
1875 LateParsedAttrList LateParsedAttrs(true);
1876 if (D.isFunctionDeclarator()) {
1877 MaybeParseGNUAttributes(D, &LateParsedAttrs);
1878
1879 // The _Noreturn keyword can't appear here, unlike the GNU noreturn
1880 // attribute. If we find the keyword here, tell the user to put it
1881 // at the start instead.
1882 if (Tok.is(tok::kw__Noreturn)) {
1883 SourceLocation Loc = ConsumeToken();
1884 const char *PrevSpec;
1885 unsigned DiagID;
1886
1887 // We can offer a fixit if it's valid to mark this function as _Noreturn
1888 // and we don't have any other declarators in this declaration.
1889 bool Fixit = !DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
1890 MaybeParseGNUAttributes(D, &LateParsedAttrs);
1891 Fixit &= Tok.isOneOf(tok::semi, tok::l_brace, tok::kw_try);
1892
1893 Diag(Loc, diag::err_c11_noreturn_misplaced)
1894 << (Fixit ? FixItHint::CreateRemoval(Loc) : FixItHint())
1895 << (Fixit ? FixItHint::CreateInsertion(D.getBeginLoc(), "_Noreturn ")
1896 : FixItHint());
1897 }
1898 }
1899
1900 // Check to see if we have a function *definition* which must have a body.
1901 if (D.isFunctionDeclarator()) {
1902 if (Tok.is(tok::equal) && NextToken().is(tok::code_completion)) {
1903 Actions.CodeCompleteAfterFunctionEquals(D);
1904 cutOffParsing();
1905 return nullptr;
1906 }
1907 // Look at the next token to make sure that this isn't a function
1908 // declaration. We have to check this because __attribute__ might be the
1909 // start of a function definition in GCC-extended K&R C.
1910 if (!isDeclarationAfterDeclarator()) {
1911
1912 // Function definitions are only allowed at file scope and in C++ classes.
1913 // The C++ inline method definition case is handled elsewhere, so we only
1914 // need to handle the file scope definition case.
1915 if (Context == DeclaratorContext::FileContext) {
1916 if (isStartOfFunctionDefinition(D)) {
1917 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
1918 Diag(Tok, diag::err_function_declared_typedef);
1919
1920 // Recover by treating the 'typedef' as spurious.
1921 DS.ClearStorageClassSpecs();
1922 }
1923
1924 Decl *TheDecl = ParseFunctionDefinition(D, ParsedTemplateInfo(),
1925 &LateParsedAttrs);
1926 return Actions.ConvertDeclToDeclGroup(TheDecl);
1927 }
1928
1929 if (isDeclarationSpecifier()) {
1930 // If there is an invalid declaration specifier right after the
1931 // function prototype, then we must be in a missing semicolon case
1932 // where this isn't actually a body. Just fall through into the code
1933 // that handles it as a prototype, and let the top-level code handle
1934 // the erroneous declspec where it would otherwise expect a comma or
1935 // semicolon.
1936 } else {
1937 Diag(Tok, diag::err_expected_fn_body);
1938 SkipUntil(tok::semi);
1939 return nullptr;
1940 }
1941 } else {
1942 if (Tok.is(tok::l_brace)) {
1943 Diag(Tok, diag::err_function_definition_not_allowed);
1944 SkipMalformedDecl();
1945 return nullptr;
1946 }
1947 }
1948 }
1949 }
1950
1951 if (ParseAsmAttributesAfterDeclarator(D))
1952 return nullptr;
1953
1954 // C++0x [stmt.iter]p1: Check if we have a for-range-declarator. If so, we
1955 // must parse and analyze the for-range-initializer before the declaration is
1956 // analyzed.
1957 //
1958 // Handle the Objective-C for-in loop variable similarly, although we
1959 // don't need to parse the container in advance.
1960 if (FRI && (Tok.is(tok::colon) || isTokIdentifier_in())) {
1961 bool IsForRangeLoop = false;
1962 if (TryConsumeToken(tok::colon, FRI->ColonLoc)) {
1963 IsForRangeLoop = true;
1964 if (getLangOpts().OpenMP)
1965 Actions.startOpenMPCXXRangeFor();
1966 if (Tok.is(tok::l_brace))
1967 FRI->RangeExpr = ParseBraceInitializer();
1968 else
1969 FRI->RangeExpr = ParseExpression();
1970 }
1971
1972 Decl *ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
1973 if (IsForRangeLoop) {
1974 Actions.ActOnCXXForRangeDecl(ThisDecl);
1975 } else {
1976 // Obj-C for loop
1977 if (auto *VD = dyn_cast_or_null<VarDecl>(ThisDecl))
1978 VD->setObjCForDecl(true);
1979 }
1980 Actions.FinalizeDeclaration(ThisDecl);
1981 D.complete(ThisDecl);
1982 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, ThisDecl);
1983 }
1984
1985 SmallVector<Decl *, 8> DeclsInGroup;
1986 Decl *FirstDecl = ParseDeclarationAfterDeclaratorAndAttributes(
1987 D, ParsedTemplateInfo(), FRI);
1988 if (LateParsedAttrs.size() > 0)
1989 ParseLexedAttributeList(LateParsedAttrs, FirstDecl, true, false);
1990 D.complete(FirstDecl);
1991 if (FirstDecl)
1992 DeclsInGroup.push_back(FirstDecl);
1993
1994 bool ExpectSemi = Context != DeclaratorContext::ForContext;
1995
1996 // If we don't have a comma, it is either the end of the list (a ';') or an
1997 // error, bail out.
1998 SourceLocation CommaLoc;
1999 while (TryConsumeToken(tok::comma, CommaLoc)) {
2000 if (Tok.isAtStartOfLine() && ExpectSemi && !MightBeDeclarator(Context)) {
2001 // This comma was followed by a line-break and something which can't be
2002 // the start of a declarator. The comma was probably a typo for a
2003 // semicolon.
2004 Diag(CommaLoc, diag::err_expected_semi_declaration)
2005 << FixItHint::CreateReplacement(CommaLoc, ";");
2006 ExpectSemi = false;
2007 break;
2008 }
2009
2010 // Parse the next declarator.
2011 D.clear();
2012 D.setCommaLoc(CommaLoc);
2013
2014 // Accept attributes in an init-declarator. In the first declarator in a
2015 // declaration, these would be part of the declspec. In subsequent
2016 // declarators, they become part of the declarator itself, so that they
2017 // don't apply to declarators after *this* one. Examples:
2018 // short __attribute__((common)) var; -> declspec
2019 // short var __attribute__((common)); -> declarator
2020 // short x, __attribute__((common)) var; -> declarator
2021 MaybeParseGNUAttributes(D);
2022
2023 // MSVC parses but ignores qualifiers after the comma as an extension.
2024 if (getLangOpts().MicrosoftExt)
2025 DiagnoseAndSkipExtendedMicrosoftTypeAttributes();
2026
2027 ParseDeclarator(D);
2028 if (!D.isInvalidType()) {
2029 // C++2a [dcl.decl]p1
2030 // init-declarator:
2031 // declarator initializer[opt]
2032 // declarator requires-clause
2033 if (Tok.is(tok::kw_requires))
2034 ParseTrailingRequiresClause(D);
2035 Decl *ThisDecl = ParseDeclarationAfterDeclarator(D);
2036 D.complete(ThisDecl);
2037 if (ThisDecl)
2038 DeclsInGroup.push_back(ThisDecl);
2039 }
2040 }
2041
2042 if (DeclEnd)
2043 *DeclEnd = Tok.getLocation();
2044
2045 if (ExpectSemi &&
2046 ExpectAndConsumeSemi(Context == DeclaratorContext::FileContext
2047 ? diag::err_invalid_token_after_toplevel_declarator
2048 : diag::err_expected_semi_declaration)) {
2049 // Okay, there was no semicolon and one was expected. If we see a
2050 // declaration specifier, just assume it was missing and continue parsing.
2051 // Otherwise things are very confused and we skip to recover.
2052 if (!isDeclarationSpecifier()) {
2053 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2054 TryConsumeToken(tok::semi);
2055 }
2056 }
2057
2058 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2059 }
2060
2061 /// Parse an optional simple-asm-expr and attributes, and attach them to a
2062 /// declarator. Returns true on an error.
ParseAsmAttributesAfterDeclarator(Declarator & D)2063 bool Parser::ParseAsmAttributesAfterDeclarator(Declarator &D) {
2064 // If a simple-asm-expr is present, parse it.
2065 if (Tok.is(tok::kw_asm)) {
2066 SourceLocation Loc;
2067 ExprResult AsmLabel(ParseSimpleAsm(/*ForAsmLabel*/ true, &Loc));
2068 if (AsmLabel.isInvalid()) {
2069 SkipUntil(tok::semi, StopBeforeMatch);
2070 return true;
2071 }
2072
2073 D.setAsmLabel(AsmLabel.get());
2074 D.SetRangeEnd(Loc);
2075 }
2076
2077 MaybeParseGNUAttributes(D);
2078 return false;
2079 }
2080
2081 /// Parse 'declaration' after parsing 'declaration-specifiers
2082 /// declarator'. This method parses the remainder of the declaration
2083 /// (including any attributes or initializer, among other things) and
2084 /// finalizes the declaration.
2085 ///
2086 /// init-declarator: [C99 6.7]
2087 /// declarator
2088 /// declarator '=' initializer
2089 /// [GNU] declarator simple-asm-expr[opt] attributes[opt]
2090 /// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer
2091 /// [C++] declarator initializer[opt]
2092 ///
2093 /// [C++] initializer:
2094 /// [C++] '=' initializer-clause
2095 /// [C++] '(' expression-list ')'
2096 /// [C++0x] '=' 'default' [TODO]
2097 /// [C++0x] '=' 'delete'
2098 /// [C++0x] braced-init-list
2099 ///
2100 /// According to the standard grammar, =default and =delete are function
2101 /// definitions, but that definitely doesn't fit with the parser here.
2102 ///
ParseDeclarationAfterDeclarator(Declarator & D,const ParsedTemplateInfo & TemplateInfo)2103 Decl *Parser::ParseDeclarationAfterDeclarator(
2104 Declarator &D, const ParsedTemplateInfo &TemplateInfo) {
2105 if (ParseAsmAttributesAfterDeclarator(D))
2106 return nullptr;
2107
2108 return ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo);
2109 }
2110
ParseDeclarationAfterDeclaratorAndAttributes(Declarator & D,const ParsedTemplateInfo & TemplateInfo,ForRangeInit * FRI)2111 Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes(
2112 Declarator &D, const ParsedTemplateInfo &TemplateInfo, ForRangeInit *FRI) {
2113 // RAII type used to track whether we're inside an initializer.
2114 struct InitializerScopeRAII {
2115 Parser &P;
2116 Declarator &D;
2117 Decl *ThisDecl;
2118
2119 InitializerScopeRAII(Parser &P, Declarator &D, Decl *ThisDecl)
2120 : P(P), D(D), ThisDecl(ThisDecl) {
2121 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2122 Scope *S = nullptr;
2123 if (D.getCXXScopeSpec().isSet()) {
2124 P.EnterScope(0);
2125 S = P.getCurScope();
2126 }
2127 P.Actions.ActOnCXXEnterDeclInitializer(S, ThisDecl);
2128 }
2129 }
2130 ~InitializerScopeRAII() { pop(); }
2131 void pop() {
2132 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2133 Scope *S = nullptr;
2134 if (D.getCXXScopeSpec().isSet())
2135 S = P.getCurScope();
2136 P.Actions.ActOnCXXExitDeclInitializer(S, ThisDecl);
2137 if (S)
2138 P.ExitScope();
2139 }
2140 ThisDecl = nullptr;
2141 }
2142 };
2143
2144 // Inform the current actions module that we just parsed this declarator.
2145 Decl *ThisDecl = nullptr;
2146 switch (TemplateInfo.Kind) {
2147 case ParsedTemplateInfo::NonTemplate:
2148 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
2149 break;
2150
2151 case ParsedTemplateInfo::Template:
2152 case ParsedTemplateInfo::ExplicitSpecialization: {
2153 ThisDecl = Actions.ActOnTemplateDeclarator(getCurScope(),
2154 *TemplateInfo.TemplateParams,
2155 D);
2156 if (VarTemplateDecl *VT = dyn_cast_or_null<VarTemplateDecl>(ThisDecl))
2157 // Re-direct this decl to refer to the templated decl so that we can
2158 // initialize it.
2159 ThisDecl = VT->getTemplatedDecl();
2160 break;
2161 }
2162 case ParsedTemplateInfo::ExplicitInstantiation: {
2163 if (Tok.is(tok::semi)) {
2164 DeclResult ThisRes = Actions.ActOnExplicitInstantiation(
2165 getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, D);
2166 if (ThisRes.isInvalid()) {
2167 SkipUntil(tok::semi, StopBeforeMatch);
2168 return nullptr;
2169 }
2170 ThisDecl = ThisRes.get();
2171 } else {
2172 // FIXME: This check should be for a variable template instantiation only.
2173
2174 // Check that this is a valid instantiation
2175 if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) {
2176 // If the declarator-id is not a template-id, issue a diagnostic and
2177 // recover by ignoring the 'template' keyword.
2178 Diag(Tok, diag::err_template_defn_explicit_instantiation)
2179 << 2 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
2180 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
2181 } else {
2182 SourceLocation LAngleLoc =
2183 PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
2184 Diag(D.getIdentifierLoc(),
2185 diag::err_explicit_instantiation_with_definition)
2186 << SourceRange(TemplateInfo.TemplateLoc)
2187 << FixItHint::CreateInsertion(LAngleLoc, "<>");
2188
2189 // Recover as if it were an explicit specialization.
2190 TemplateParameterLists FakedParamLists;
2191 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
2192 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
2193 LAngleLoc, nullptr));
2194
2195 ThisDecl =
2196 Actions.ActOnTemplateDeclarator(getCurScope(), FakedParamLists, D);
2197 }
2198 }
2199 break;
2200 }
2201 }
2202
2203 // Parse declarator '=' initializer.
2204 // If a '==' or '+=' is found, suggest a fixit to '='.
2205 if (isTokenEqualOrEqualTypo()) {
2206 SourceLocation EqualLoc = ConsumeToken();
2207
2208 if (Tok.is(tok::kw_delete)) {
2209 if (D.isFunctionDeclarator())
2210 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2211 << 1 /* delete */;
2212 else
2213 Diag(ConsumeToken(), diag::err_deleted_non_function);
2214 } else if (Tok.is(tok::kw_default)) {
2215 if (D.isFunctionDeclarator())
2216 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2217 << 0 /* default */;
2218 else
2219 Diag(ConsumeToken(), diag::err_default_special_members)
2220 << getLangOpts().CPlusPlus20;
2221 } else {
2222 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2223
2224 if (Tok.is(tok::code_completion)) {
2225 Actions.CodeCompleteInitializer(getCurScope(), ThisDecl);
2226 Actions.FinalizeDeclaration(ThisDecl);
2227 cutOffParsing();
2228 return nullptr;
2229 }
2230
2231 PreferredType.enterVariableInit(Tok.getLocation(), ThisDecl);
2232 ExprResult Init = ParseInitializer();
2233
2234 // If this is the only decl in (possibly) range based for statement,
2235 // our best guess is that the user meant ':' instead of '='.
2236 if (Tok.is(tok::r_paren) && FRI && D.isFirstDeclarator()) {
2237 Diag(EqualLoc, diag::err_single_decl_assign_in_for_range)
2238 << FixItHint::CreateReplacement(EqualLoc, ":");
2239 // We are trying to stop parser from looking for ';' in this for
2240 // statement, therefore preventing spurious errors to be issued.
2241 FRI->ColonLoc = EqualLoc;
2242 Init = ExprError();
2243 FRI->RangeExpr = Init;
2244 }
2245
2246 InitScope.pop();
2247
2248 if (Init.isInvalid()) {
2249 SmallVector<tok::TokenKind, 2> StopTokens;
2250 StopTokens.push_back(tok::comma);
2251 if (D.getContext() == DeclaratorContext::ForContext ||
2252 D.getContext() == DeclaratorContext::InitStmtContext)
2253 StopTokens.push_back(tok::r_paren);
2254 SkipUntil(StopTokens, StopAtSemi | StopBeforeMatch);
2255 Actions.ActOnInitializerError(ThisDecl);
2256 } else
2257 Actions.AddInitializerToDecl(ThisDecl, Init.get(),
2258 /*DirectInit=*/false);
2259 }
2260 } else if (Tok.is(tok::l_paren)) {
2261 // Parse C++ direct initializer: '(' expression-list ')'
2262 BalancedDelimiterTracker T(*this, tok::l_paren);
2263 T.consumeOpen();
2264
2265 ExprVector Exprs;
2266 CommaLocsTy CommaLocs;
2267
2268 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2269
2270 auto ThisVarDecl = dyn_cast_or_null<VarDecl>(ThisDecl);
2271 auto RunSignatureHelp = [&]() {
2272 QualType PreferredType = Actions.ProduceConstructorSignatureHelp(
2273 getCurScope(), ThisVarDecl->getType()->getCanonicalTypeInternal(),
2274 ThisDecl->getLocation(), Exprs, T.getOpenLocation());
2275 CalledSignatureHelp = true;
2276 return PreferredType;
2277 };
2278 auto SetPreferredType = [&] {
2279 PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp);
2280 };
2281
2282 llvm::function_ref<void()> ExpressionStarts;
2283 if (ThisVarDecl) {
2284 // ParseExpressionList can sometimes succeed even when ThisDecl is not
2285 // VarDecl. This is an error and it is reported in a call to
2286 // Actions.ActOnInitializerError(). However, we call
2287 // ProduceConstructorSignatureHelp only on VarDecls.
2288 ExpressionStarts = SetPreferredType;
2289 }
2290 if (ParseExpressionList(Exprs, CommaLocs, ExpressionStarts)) {
2291 if (ThisVarDecl && PP.isCodeCompletionReached() && !CalledSignatureHelp) {
2292 Actions.ProduceConstructorSignatureHelp(
2293 getCurScope(), ThisVarDecl->getType()->getCanonicalTypeInternal(),
2294 ThisDecl->getLocation(), Exprs, T.getOpenLocation());
2295 CalledSignatureHelp = true;
2296 }
2297 Actions.ActOnInitializerError(ThisDecl);
2298 SkipUntil(tok::r_paren, StopAtSemi);
2299 } else {
2300 // Match the ')'.
2301 T.consumeClose();
2302
2303 assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() &&
2304 "Unexpected number of commas!");
2305
2306 InitScope.pop();
2307
2308 ExprResult Initializer = Actions.ActOnParenListExpr(T.getOpenLocation(),
2309 T.getCloseLocation(),
2310 Exprs);
2311 Actions.AddInitializerToDecl(ThisDecl, Initializer.get(),
2312 /*DirectInit=*/true);
2313 }
2314 } else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace) &&
2315 (!CurParsedObjCImpl || !D.isFunctionDeclarator())) {
2316 // Parse C++0x braced-init-list.
2317 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2318
2319 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2320
2321 PreferredType.enterVariableInit(Tok.getLocation(), ThisDecl);
2322 ExprResult Init(ParseBraceInitializer());
2323
2324 InitScope.pop();
2325
2326 if (Init.isInvalid()) {
2327 Actions.ActOnInitializerError(ThisDecl);
2328 } else
2329 Actions.AddInitializerToDecl(ThisDecl, Init.get(), /*DirectInit=*/true);
2330
2331 } else {
2332 Actions.ActOnUninitializedDecl(ThisDecl);
2333 }
2334
2335 Actions.FinalizeDeclaration(ThisDecl);
2336
2337 return ThisDecl;
2338 }
2339
2340 /// ParseSpecifierQualifierList
2341 /// specifier-qualifier-list:
2342 /// type-specifier specifier-qualifier-list[opt]
2343 /// type-qualifier specifier-qualifier-list[opt]
2344 /// [GNU] attributes specifier-qualifier-list[opt]
2345 ///
ParseSpecifierQualifierList(DeclSpec & DS,AccessSpecifier AS,DeclSpecContext DSC)2346 void Parser::ParseSpecifierQualifierList(DeclSpec &DS, AccessSpecifier AS,
2347 DeclSpecContext DSC) {
2348 /// specifier-qualifier-list is a subset of declaration-specifiers. Just
2349 /// parse declaration-specifiers and complain about extra stuff.
2350 /// TODO: diagnose attribute-specifiers and alignment-specifiers.
2351 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC);
2352
2353 // Validate declspec for type-name.
2354 unsigned Specs = DS.getParsedSpecifiers();
2355 if (isTypeSpecifier(DSC) && !DS.hasTypeSpecifier()) {
2356 Diag(Tok, diag::err_expected_type);
2357 DS.SetTypeSpecError();
2358 } else if (Specs == DeclSpec::PQ_None && !DS.hasAttributes()) {
2359 Diag(Tok, diag::err_typename_requires_specqual);
2360 if (!DS.hasTypeSpecifier())
2361 DS.SetTypeSpecError();
2362 }
2363
2364 // Issue diagnostic and remove storage class if present.
2365 if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
2366 if (DS.getStorageClassSpecLoc().isValid())
2367 Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
2368 else
2369 Diag(DS.getThreadStorageClassSpecLoc(),
2370 diag::err_typename_invalid_storageclass);
2371 DS.ClearStorageClassSpecs();
2372 }
2373
2374 // Issue diagnostic and remove function specifier if present.
2375 if (Specs & DeclSpec::PQ_FunctionSpecifier) {
2376 if (DS.isInlineSpecified())
2377 Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
2378 if (DS.isVirtualSpecified())
2379 Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec);
2380 if (DS.hasExplicitSpecifier())
2381 Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec);
2382 DS.ClearFunctionSpecs();
2383 }
2384
2385 // Issue diagnostic and remove constexpr specifier if present.
2386 if (DS.hasConstexprSpecifier() && DSC != DeclSpecContext::DSC_condition) {
2387 Diag(DS.getConstexprSpecLoc(), diag::err_typename_invalid_constexpr)
2388 << DS.getConstexprSpecifier();
2389 DS.ClearConstexprSpec();
2390 }
2391 }
2392
2393 /// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the
2394 /// specified token is valid after the identifier in a declarator which
2395 /// immediately follows the declspec. For example, these things are valid:
2396 ///
2397 /// int x [ 4]; // direct-declarator
2398 /// int x ( int y); // direct-declarator
2399 /// int(int x ) // direct-declarator
2400 /// int x ; // simple-declaration
2401 /// int x = 17; // init-declarator-list
2402 /// int x , y; // init-declarator-list
2403 /// int x __asm__ ("foo"); // init-declarator-list
2404 /// int x : 4; // struct-declarator
2405 /// int x { 5}; // C++'0x unified initializers
2406 ///
2407 /// This is not, because 'x' does not immediately follow the declspec (though
2408 /// ')' happens to be valid anyway).
2409 /// int (x)
2410 ///
isValidAfterIdentifierInDeclarator(const Token & T)2411 static bool isValidAfterIdentifierInDeclarator(const Token &T) {
2412 return T.isOneOf(tok::l_square, tok::l_paren, tok::r_paren, tok::semi,
2413 tok::comma, tok::equal, tok::kw_asm, tok::l_brace,
2414 tok::colon);
2415 }
2416
2417 /// ParseImplicitInt - This method is called when we have an non-typename
2418 /// identifier in a declspec (which normally terminates the decl spec) when
2419 /// the declspec has no type specifier. In this case, the declspec is either
2420 /// malformed or is "implicit int" (in K&R and C89).
2421 ///
2422 /// This method handles diagnosing this prettily and returns false if the
2423 /// declspec is done being processed. If it recovers and thinks there may be
2424 /// other pieces of declspec after it, it returns true.
2425 ///
ParseImplicitInt(DeclSpec & DS,CXXScopeSpec * SS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSC,ParsedAttributesWithRange & Attrs)2426 bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
2427 const ParsedTemplateInfo &TemplateInfo,
2428 AccessSpecifier AS, DeclSpecContext DSC,
2429 ParsedAttributesWithRange &Attrs) {
2430 assert(Tok.is(tok::identifier) && "should have identifier");
2431
2432 SourceLocation Loc = Tok.getLocation();
2433 // If we see an identifier that is not a type name, we normally would
2434 // parse it as the identifier being declared. However, when a typename
2435 // is typo'd or the definition is not included, this will incorrectly
2436 // parse the typename as the identifier name and fall over misparsing
2437 // later parts of the diagnostic.
2438 //
2439 // As such, we try to do some look-ahead in cases where this would
2440 // otherwise be an "implicit-int" case to see if this is invalid. For
2441 // example: "static foo_t x = 4;" In this case, if we parsed foo_t as
2442 // an identifier with implicit int, we'd get a parse error because the
2443 // next token is obviously invalid for a type. Parse these as a case
2444 // with an invalid type specifier.
2445 assert(!DS.hasTypeSpecifier() && "Type specifier checked above");
2446
2447 // Since we know that this either implicit int (which is rare) or an
2448 // error, do lookahead to try to do better recovery. This never applies
2449 // within a type specifier. Outside of C++, we allow this even if the
2450 // language doesn't "officially" support implicit int -- we support
2451 // implicit int as an extension in C99 and C11.
2452 if (!isTypeSpecifier(DSC) && !getLangOpts().CPlusPlus &&
2453 isValidAfterIdentifierInDeclarator(NextToken())) {
2454 // If this token is valid for implicit int, e.g. "static x = 4", then
2455 // we just avoid eating the identifier, so it will be parsed as the
2456 // identifier in the declarator.
2457 return false;
2458 }
2459
2460 // Early exit as Sema has a dedicated missing_actual_pipe_type diagnostic
2461 // for incomplete declarations such as `pipe p`.
2462 if (getLangOpts().OpenCLCPlusPlus && DS.isTypeSpecPipe())
2463 return false;
2464
2465 if (getLangOpts().CPlusPlus &&
2466 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
2467 // Don't require a type specifier if we have the 'auto' storage class
2468 // specifier in C++98 -- we'll promote it to a type specifier.
2469 if (SS)
2470 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
2471 return false;
2472 }
2473
2474 if (getLangOpts().CPlusPlus && (!SS || SS->isEmpty()) &&
2475 getLangOpts().MSVCCompat) {
2476 // Lookup of an unqualified type name has failed in MSVC compatibility mode.
2477 // Give Sema a chance to recover if we are in a template with dependent base
2478 // classes.
2479 if (ParsedType T = Actions.ActOnMSVCUnknownTypeName(
2480 *Tok.getIdentifierInfo(), Tok.getLocation(),
2481 DSC == DeclSpecContext::DSC_template_type_arg)) {
2482 const char *PrevSpec;
2483 unsigned DiagID;
2484 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
2485 Actions.getASTContext().getPrintingPolicy());
2486 DS.SetRangeEnd(Tok.getLocation());
2487 ConsumeToken();
2488 return false;
2489 }
2490 }
2491
2492 // Otherwise, if we don't consume this token, we are going to emit an
2493 // error anyway. Try to recover from various common problems. Check
2494 // to see if this was a reference to a tag name without a tag specified.
2495 // This is a common problem in C (saying 'foo' instead of 'struct foo').
2496 //
2497 // C++ doesn't need this, and isTagName doesn't take SS.
2498 if (SS == nullptr) {
2499 const char *TagName = nullptr, *FixitTagName = nullptr;
2500 tok::TokenKind TagKind = tok::unknown;
2501
2502 switch (Actions.isTagName(*Tok.getIdentifierInfo(), getCurScope())) {
2503 default: break;
2504 case DeclSpec::TST_enum:
2505 TagName="enum" ; FixitTagName = "enum " ; TagKind=tok::kw_enum ;break;
2506 case DeclSpec::TST_union:
2507 TagName="union" ; FixitTagName = "union " ;TagKind=tok::kw_union ;break;
2508 case DeclSpec::TST_struct:
2509 TagName="struct"; FixitTagName = "struct ";TagKind=tok::kw_struct;break;
2510 case DeclSpec::TST_interface:
2511 TagName="__interface"; FixitTagName = "__interface ";
2512 TagKind=tok::kw___interface;break;
2513 case DeclSpec::TST_class:
2514 TagName="class" ; FixitTagName = "class " ;TagKind=tok::kw_class ;break;
2515 }
2516
2517 if (TagName) {
2518 IdentifierInfo *TokenName = Tok.getIdentifierInfo();
2519 LookupResult R(Actions, TokenName, SourceLocation(),
2520 Sema::LookupOrdinaryName);
2521
2522 Diag(Loc, diag::err_use_of_tag_name_without_tag)
2523 << TokenName << TagName << getLangOpts().CPlusPlus
2524 << FixItHint::CreateInsertion(Tok.getLocation(), FixitTagName);
2525
2526 if (Actions.LookupParsedName(R, getCurScope(), SS)) {
2527 for (LookupResult::iterator I = R.begin(), IEnd = R.end();
2528 I != IEnd; ++I)
2529 Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
2530 << TokenName << TagName;
2531 }
2532
2533 // Parse this as a tag as if the missing tag were present.
2534 if (TagKind == tok::kw_enum)
2535 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS,
2536 DeclSpecContext::DSC_normal);
2537 else
2538 ParseClassSpecifier(TagKind, Loc, DS, TemplateInfo, AS,
2539 /*EnteringContext*/ false,
2540 DeclSpecContext::DSC_normal, Attrs);
2541 return true;
2542 }
2543 }
2544
2545 // Determine whether this identifier could plausibly be the name of something
2546 // being declared (with a missing type).
2547 if (!isTypeSpecifier(DSC) && (!SS || DSC == DeclSpecContext::DSC_top_level ||
2548 DSC == DeclSpecContext::DSC_class)) {
2549 // Look ahead to the next token to try to figure out what this declaration
2550 // was supposed to be.
2551 switch (NextToken().getKind()) {
2552 case tok::l_paren: {
2553 // static x(4); // 'x' is not a type
2554 // x(int n); // 'x' is not a type
2555 // x (*p)[]; // 'x' is a type
2556 //
2557 // Since we're in an error case, we can afford to perform a tentative
2558 // parse to determine which case we're in.
2559 TentativeParsingAction PA(*this);
2560 ConsumeToken();
2561 TPResult TPR = TryParseDeclarator(/*mayBeAbstract*/false);
2562 PA.Revert();
2563
2564 if (TPR != TPResult::False) {
2565 // The identifier is followed by a parenthesized declarator.
2566 // It's supposed to be a type.
2567 break;
2568 }
2569
2570 // If we're in a context where we could be declaring a constructor,
2571 // check whether this is a constructor declaration with a bogus name.
2572 if (DSC == DeclSpecContext::DSC_class ||
2573 (DSC == DeclSpecContext::DSC_top_level && SS)) {
2574 IdentifierInfo *II = Tok.getIdentifierInfo();
2575 if (Actions.isCurrentClassNameTypo(II, SS)) {
2576 Diag(Loc, diag::err_constructor_bad_name)
2577 << Tok.getIdentifierInfo() << II
2578 << FixItHint::CreateReplacement(Tok.getLocation(), II->getName());
2579 Tok.setIdentifierInfo(II);
2580 }
2581 }
2582 // Fall through.
2583 LLVM_FALLTHROUGH;
2584 }
2585 case tok::comma:
2586 case tok::equal:
2587 case tok::kw_asm:
2588 case tok::l_brace:
2589 case tok::l_square:
2590 case tok::semi:
2591 // This looks like a variable or function declaration. The type is
2592 // probably missing. We're done parsing decl-specifiers.
2593 // But only if we are not in a function prototype scope.
2594 if (getCurScope()->isFunctionPrototypeScope())
2595 break;
2596 if (SS)
2597 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
2598 return false;
2599
2600 default:
2601 // This is probably supposed to be a type. This includes cases like:
2602 // int f(itn);
2603 // struct S { unsigned : 4; };
2604 break;
2605 }
2606 }
2607
2608 // This is almost certainly an invalid type name. Let Sema emit a diagnostic
2609 // and attempt to recover.
2610 ParsedType T;
2611 IdentifierInfo *II = Tok.getIdentifierInfo();
2612 bool IsTemplateName = getLangOpts().CPlusPlus && NextToken().is(tok::less);
2613 Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
2614 IsTemplateName);
2615 if (T) {
2616 // The action has suggested that the type T could be used. Set that as
2617 // the type in the declaration specifiers, consume the would-be type
2618 // name token, and we're done.
2619 const char *PrevSpec;
2620 unsigned DiagID;
2621 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
2622 Actions.getASTContext().getPrintingPolicy());
2623 DS.SetRangeEnd(Tok.getLocation());
2624 ConsumeToken();
2625 // There may be other declaration specifiers after this.
2626 return true;
2627 } else if (II != Tok.getIdentifierInfo()) {
2628 // If no type was suggested, the correction is to a keyword
2629 Tok.setKind(II->getTokenID());
2630 // There may be other declaration specifiers after this.
2631 return true;
2632 }
2633
2634 // Otherwise, the action had no suggestion for us. Mark this as an error.
2635 DS.SetTypeSpecError();
2636 DS.SetRangeEnd(Tok.getLocation());
2637 ConsumeToken();
2638
2639 // Eat any following template arguments.
2640 if (IsTemplateName) {
2641 SourceLocation LAngle, RAngle;
2642 TemplateArgList Args;
2643 ParseTemplateIdAfterTemplateName(true, LAngle, Args, RAngle);
2644 }
2645
2646 // TODO: Could inject an invalid typedef decl in an enclosing scope to
2647 // avoid rippling error messages on subsequent uses of the same type,
2648 // could be useful if #include was forgotten.
2649 return true;
2650 }
2651
2652 /// Determine the declaration specifier context from the declarator
2653 /// context.
2654 ///
2655 /// \param Context the declarator context, which is one of the
2656 /// DeclaratorContext enumerator values.
2657 Parser::DeclSpecContext
getDeclSpecContextFromDeclaratorContext(DeclaratorContext Context)2658 Parser::getDeclSpecContextFromDeclaratorContext(DeclaratorContext Context) {
2659 if (Context == DeclaratorContext::MemberContext)
2660 return DeclSpecContext::DSC_class;
2661 if (Context == DeclaratorContext::FileContext)
2662 return DeclSpecContext::DSC_top_level;
2663 if (Context == DeclaratorContext::TemplateParamContext)
2664 return DeclSpecContext::DSC_template_param;
2665 if (Context == DeclaratorContext::TemplateArgContext ||
2666 Context == DeclaratorContext::TemplateTypeArgContext)
2667 return DeclSpecContext::DSC_template_type_arg;
2668 if (Context == DeclaratorContext::TrailingReturnContext ||
2669 Context == DeclaratorContext::TrailingReturnVarContext)
2670 return DeclSpecContext::DSC_trailing;
2671 if (Context == DeclaratorContext::AliasDeclContext ||
2672 Context == DeclaratorContext::AliasTemplateContext)
2673 return DeclSpecContext::DSC_alias_declaration;
2674 return DeclSpecContext::DSC_normal;
2675 }
2676
2677 /// ParseAlignArgument - Parse the argument to an alignment-specifier.
2678 ///
2679 /// FIXME: Simply returns an alignof() expression if the argument is a
2680 /// type. Ideally, the type should be propagated directly into Sema.
2681 ///
2682 /// [C11] type-id
2683 /// [C11] constant-expression
2684 /// [C++0x] type-id ...[opt]
2685 /// [C++0x] assignment-expression ...[opt]
ParseAlignArgument(SourceLocation Start,SourceLocation & EllipsisLoc)2686 ExprResult Parser::ParseAlignArgument(SourceLocation Start,
2687 SourceLocation &EllipsisLoc) {
2688 ExprResult ER;
2689 if (isTypeIdInParens()) {
2690 SourceLocation TypeLoc = Tok.getLocation();
2691 ParsedType Ty = ParseTypeName().get();
2692 SourceRange TypeRange(Start, Tok.getLocation());
2693 ER = Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true,
2694 Ty.getAsOpaquePtr(), TypeRange);
2695 } else
2696 ER = ParseConstantExpression();
2697
2698 if (getLangOpts().CPlusPlus11)
2699 TryConsumeToken(tok::ellipsis, EllipsisLoc);
2700
2701 return ER;
2702 }
2703
2704 /// ParseAlignmentSpecifier - Parse an alignment-specifier, and add the
2705 /// attribute to Attrs.
2706 ///
2707 /// alignment-specifier:
2708 /// [C11] '_Alignas' '(' type-id ')'
2709 /// [C11] '_Alignas' '(' constant-expression ')'
2710 /// [C++11] 'alignas' '(' type-id ...[opt] ')'
2711 /// [C++11] 'alignas' '(' assignment-expression ...[opt] ')'
ParseAlignmentSpecifier(ParsedAttributes & Attrs,SourceLocation * EndLoc)2712 void Parser::ParseAlignmentSpecifier(ParsedAttributes &Attrs,
2713 SourceLocation *EndLoc) {
2714 assert(Tok.isOneOf(tok::kw_alignas, tok::kw__Alignas) &&
2715 "Not an alignment-specifier!");
2716
2717 IdentifierInfo *KWName = Tok.getIdentifierInfo();
2718 SourceLocation KWLoc = ConsumeToken();
2719
2720 BalancedDelimiterTracker T(*this, tok::l_paren);
2721 if (T.expectAndConsume())
2722 return;
2723
2724 SourceLocation EllipsisLoc;
2725 ExprResult ArgExpr = ParseAlignArgument(T.getOpenLocation(), EllipsisLoc);
2726 if (ArgExpr.isInvalid()) {
2727 T.skipToEnd();
2728 return;
2729 }
2730
2731 T.consumeClose();
2732 if (EndLoc)
2733 *EndLoc = T.getCloseLocation();
2734
2735 ArgsVector ArgExprs;
2736 ArgExprs.push_back(ArgExpr.get());
2737 Attrs.addNew(KWName, KWLoc, nullptr, KWLoc, ArgExprs.data(), 1,
2738 ParsedAttr::AS_Keyword, EllipsisLoc);
2739 }
2740
ParseExtIntegerArgument()2741 ExprResult Parser::ParseExtIntegerArgument() {
2742 assert(Tok.is(tok::kw__ExtInt) && "Not an extended int type");
2743 ConsumeToken();
2744
2745 BalancedDelimiterTracker T(*this, tok::l_paren);
2746 if (T.expectAndConsume())
2747 return ExprError();
2748
2749 ExprResult ER = ParseConstantExpression();
2750 if (ER.isInvalid()) {
2751 T.skipToEnd();
2752 return ExprError();
2753 }
2754
2755 if(T.consumeClose())
2756 return ExprError();
2757 return ER;
2758 }
2759
2760 /// Determine whether we're looking at something that might be a declarator
2761 /// in a simple-declaration. If it can't possibly be a declarator, maybe
2762 /// diagnose a missing semicolon after a prior tag definition in the decl
2763 /// specifier.
2764 ///
2765 /// \return \c true if an error occurred and this can't be any kind of
2766 /// declaration.
2767 bool
DiagnoseMissingSemiAfterTagDefinition(DeclSpec & DS,AccessSpecifier AS,DeclSpecContext DSContext,LateParsedAttrList * LateAttrs)2768 Parser::DiagnoseMissingSemiAfterTagDefinition(DeclSpec &DS, AccessSpecifier AS,
2769 DeclSpecContext DSContext,
2770 LateParsedAttrList *LateAttrs) {
2771 assert(DS.hasTagDefinition() && "shouldn't call this");
2772
2773 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
2774 DSContext == DeclSpecContext::DSC_top_level);
2775
2776 if (getLangOpts().CPlusPlus &&
2777 Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw_decltype,
2778 tok::annot_template_id) &&
2779 TryAnnotateCXXScopeToken(EnteringContext)) {
2780 SkipMalformedDecl();
2781 return true;
2782 }
2783
2784 bool HasScope = Tok.is(tok::annot_cxxscope);
2785 // Make a copy in case GetLookAheadToken invalidates the result of NextToken.
2786 Token AfterScope = HasScope ? NextToken() : Tok;
2787
2788 // Determine whether the following tokens could possibly be a
2789 // declarator.
2790 bool MightBeDeclarator = true;
2791 if (Tok.isOneOf(tok::kw_typename, tok::annot_typename)) {
2792 // A declarator-id can't start with 'typename'.
2793 MightBeDeclarator = false;
2794 } else if (AfterScope.is(tok::annot_template_id)) {
2795 // If we have a type expressed as a template-id, this cannot be a
2796 // declarator-id (such a type cannot be redeclared in a simple-declaration).
2797 TemplateIdAnnotation *Annot =
2798 static_cast<TemplateIdAnnotation *>(AfterScope.getAnnotationValue());
2799 if (Annot->Kind == TNK_Type_template)
2800 MightBeDeclarator = false;
2801 } else if (AfterScope.is(tok::identifier)) {
2802 const Token &Next = HasScope ? GetLookAheadToken(2) : NextToken();
2803
2804 // These tokens cannot come after the declarator-id in a
2805 // simple-declaration, and are likely to come after a type-specifier.
2806 if (Next.isOneOf(tok::star, tok::amp, tok::ampamp, tok::identifier,
2807 tok::annot_cxxscope, tok::coloncolon)) {
2808 // Missing a semicolon.
2809 MightBeDeclarator = false;
2810 } else if (HasScope) {
2811 // If the declarator-id has a scope specifier, it must redeclare a
2812 // previously-declared entity. If that's a type (and this is not a
2813 // typedef), that's an error.
2814 CXXScopeSpec SS;
2815 Actions.RestoreNestedNameSpecifierAnnotation(
2816 Tok.getAnnotationValue(), Tok.getAnnotationRange(), SS);
2817 IdentifierInfo *Name = AfterScope.getIdentifierInfo();
2818 Sema::NameClassification Classification = Actions.ClassifyName(
2819 getCurScope(), SS, Name, AfterScope.getLocation(), Next,
2820 /*CCC=*/nullptr);
2821 switch (Classification.getKind()) {
2822 case Sema::NC_Error:
2823 SkipMalformedDecl();
2824 return true;
2825
2826 case Sema::NC_Keyword:
2827 llvm_unreachable("typo correction is not possible here");
2828
2829 case Sema::NC_Type:
2830 case Sema::NC_TypeTemplate:
2831 case Sema::NC_UndeclaredNonType:
2832 case Sema::NC_UndeclaredTemplate:
2833 // Not a previously-declared non-type entity.
2834 MightBeDeclarator = false;
2835 break;
2836
2837 case Sema::NC_Unknown:
2838 case Sema::NC_NonType:
2839 case Sema::NC_DependentNonType:
2840 case Sema::NC_ContextIndependentExpr:
2841 case Sema::NC_VarTemplate:
2842 case Sema::NC_FunctionTemplate:
2843 case Sema::NC_Concept:
2844 // Might be a redeclaration of a prior entity.
2845 break;
2846 }
2847 }
2848 }
2849
2850 if (MightBeDeclarator)
2851 return false;
2852
2853 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
2854 Diag(PP.getLocForEndOfToken(DS.getRepAsDecl()->getEndLoc()),
2855 diag::err_expected_after)
2856 << DeclSpec::getSpecifierName(DS.getTypeSpecType(), PPol) << tok::semi;
2857
2858 // Try to recover from the typo, by dropping the tag definition and parsing
2859 // the problematic tokens as a type.
2860 //
2861 // FIXME: Split the DeclSpec into pieces for the standalone
2862 // declaration and pieces for the following declaration, instead
2863 // of assuming that all the other pieces attach to new declaration,
2864 // and call ParsedFreeStandingDeclSpec as appropriate.
2865 DS.ClearTypeSpecType();
2866 ParsedTemplateInfo NotATemplate;
2867 ParseDeclarationSpecifiers(DS, NotATemplate, AS, DSContext, LateAttrs);
2868 return false;
2869 }
2870
2871 // Choose the apprpriate diagnostic error for why fixed point types are
2872 // disabled, set the previous specifier, and mark as invalid.
SetupFixedPointError(const LangOptions & LangOpts,const char * & PrevSpec,unsigned & DiagID,bool & isInvalid)2873 static void SetupFixedPointError(const LangOptions &LangOpts,
2874 const char *&PrevSpec, unsigned &DiagID,
2875 bool &isInvalid) {
2876 assert(!LangOpts.FixedPoint);
2877 DiagID = diag::err_fixed_point_not_enabled;
2878 PrevSpec = ""; // Not used by diagnostic
2879 isInvalid = true;
2880 }
2881
2882 /// ParseDeclarationSpecifiers
2883 /// declaration-specifiers: [C99 6.7]
2884 /// storage-class-specifier declaration-specifiers[opt]
2885 /// type-specifier declaration-specifiers[opt]
2886 /// [C99] function-specifier declaration-specifiers[opt]
2887 /// [C11] alignment-specifier declaration-specifiers[opt]
2888 /// [GNU] attributes declaration-specifiers[opt]
2889 /// [Clang] '__module_private__' declaration-specifiers[opt]
2890 /// [ObjC1] '__kindof' declaration-specifiers[opt]
2891 ///
2892 /// storage-class-specifier: [C99 6.7.1]
2893 /// 'typedef'
2894 /// 'extern'
2895 /// 'static'
2896 /// 'auto'
2897 /// 'register'
2898 /// [C++] 'mutable'
2899 /// [C++11] 'thread_local'
2900 /// [C11] '_Thread_local'
2901 /// [GNU] '__thread'
2902 /// function-specifier: [C99 6.7.4]
2903 /// [C99] 'inline'
2904 /// [C++] 'virtual'
2905 /// [C++] 'explicit'
2906 /// [OpenCL] '__kernel'
2907 /// 'friend': [C++ dcl.friend]
2908 /// 'constexpr': [C++0x dcl.constexpr]
ParseDeclarationSpecifiers(DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSContext,LateParsedAttrList * LateAttrs)2909 void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
2910 const ParsedTemplateInfo &TemplateInfo,
2911 AccessSpecifier AS,
2912 DeclSpecContext DSContext,
2913 LateParsedAttrList *LateAttrs) {
2914 if (DS.getSourceRange().isInvalid()) {
2915 // Start the range at the current token but make the end of the range
2916 // invalid. This will make the entire range invalid unless we successfully
2917 // consume a token.
2918 DS.SetRangeStart(Tok.getLocation());
2919 DS.SetRangeEnd(SourceLocation());
2920 }
2921
2922 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
2923 DSContext == DeclSpecContext::DSC_top_level);
2924 bool AttrsLastTime = false;
2925 ParsedAttributesWithRange attrs(AttrFactory);
2926 // We use Sema's policy to get bool macros right.
2927 PrintingPolicy Policy = Actions.getPrintingPolicy();
2928 while (1) {
2929 bool isInvalid = false;
2930 bool isStorageClass = false;
2931 const char *PrevSpec = nullptr;
2932 unsigned DiagID = 0;
2933
2934 // This value needs to be set to the location of the last token if the last
2935 // token of the specifier is already consumed.
2936 SourceLocation ConsumedEnd;
2937
2938 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
2939 // implementation for VS2013 uses _Atomic as an identifier for one of the
2940 // classes in <atomic>.
2941 //
2942 // A typedef declaration containing _Atomic<...> is among the places where
2943 // the class is used. If we are currently parsing such a declaration, treat
2944 // the token as an identifier.
2945 if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
2946 DS.getStorageClassSpec() == clang::DeclSpec::SCS_typedef &&
2947 !DS.hasTypeSpecifier() && GetLookAheadToken(1).is(tok::less))
2948 Tok.setKind(tok::identifier);
2949
2950 SourceLocation Loc = Tok.getLocation();
2951
2952 switch (Tok.getKind()) {
2953 default:
2954 DoneWithDeclSpec:
2955 if (!AttrsLastTime)
2956 ProhibitAttributes(attrs);
2957 else {
2958 // Reject C++11 attributes that appertain to decl specifiers as
2959 // we don't support any C++11 attributes that appertain to decl
2960 // specifiers. This also conforms to what g++ 4.8 is doing.
2961 ProhibitCXX11Attributes(attrs, diag::err_attribute_not_type_attr);
2962
2963 DS.takeAttributesFrom(attrs);
2964 }
2965
2966 // If this is not a declaration specifier token, we're done reading decl
2967 // specifiers. First verify that DeclSpec's are consistent.
2968 DS.Finish(Actions, Policy);
2969 return;
2970
2971 case tok::l_square:
2972 case tok::kw_alignas:
2973 if (!standardAttributesAllowed() || !isCXX11AttributeSpecifier())
2974 goto DoneWithDeclSpec;
2975
2976 ProhibitAttributes(attrs);
2977 // FIXME: It would be good to recover by accepting the attributes,
2978 // but attempting to do that now would cause serious
2979 // madness in terms of diagnostics.
2980 attrs.clear();
2981 attrs.Range = SourceRange();
2982
2983 ParseCXX11Attributes(attrs);
2984 AttrsLastTime = true;
2985 continue;
2986
2987 case tok::code_completion: {
2988 Sema::ParserCompletionContext CCC = Sema::PCC_Namespace;
2989 if (DS.hasTypeSpecifier()) {
2990 bool AllowNonIdentifiers
2991 = (getCurScope()->getFlags() & (Scope::ControlScope |
2992 Scope::BlockScope |
2993 Scope::TemplateParamScope |
2994 Scope::FunctionPrototypeScope |
2995 Scope::AtCatchScope)) == 0;
2996 bool AllowNestedNameSpecifiers
2997 = DSContext == DeclSpecContext::DSC_top_level ||
2998 (DSContext == DeclSpecContext::DSC_class && DS.isFriendSpecified());
2999
3000 Actions.CodeCompleteDeclSpec(getCurScope(), DS,
3001 AllowNonIdentifiers,
3002 AllowNestedNameSpecifiers);
3003 return cutOffParsing();
3004 }
3005
3006 if (getCurScope()->getFnParent() || getCurScope()->getBlockParent())
3007 CCC = Sema::PCC_LocalDeclarationSpecifiers;
3008 else if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate)
3009 CCC = DSContext == DeclSpecContext::DSC_class ? Sema::PCC_MemberTemplate
3010 : Sema::PCC_Template;
3011 else if (DSContext == DeclSpecContext::DSC_class)
3012 CCC = Sema::PCC_Class;
3013 else if (CurParsedObjCImpl)
3014 CCC = Sema::PCC_ObjCImplementation;
3015
3016 Actions.CodeCompleteOrdinaryName(getCurScope(), CCC);
3017 return cutOffParsing();
3018 }
3019
3020 case tok::coloncolon: // ::foo::bar
3021 // C++ scope specifier. Annotate and loop, or bail out on error.
3022 if (TryAnnotateCXXScopeToken(EnteringContext)) {
3023 if (!DS.hasTypeSpecifier())
3024 DS.SetTypeSpecError();
3025 goto DoneWithDeclSpec;
3026 }
3027 if (Tok.is(tok::coloncolon)) // ::new or ::delete
3028 goto DoneWithDeclSpec;
3029 continue;
3030
3031 case tok::annot_cxxscope: {
3032 if (DS.hasTypeSpecifier() || DS.isTypeAltiVecVector())
3033 goto DoneWithDeclSpec;
3034
3035 CXXScopeSpec SS;
3036 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(),
3037 Tok.getAnnotationRange(),
3038 SS);
3039
3040 // We are looking for a qualified typename.
3041 Token Next = NextToken();
3042
3043 TemplateIdAnnotation *TemplateId = Next.is(tok::annot_template_id)
3044 ? takeTemplateIdAnnotation(Next)
3045 : nullptr;
3046 if (TemplateId && TemplateId->hasInvalidName()) {
3047 // We found something like 'T::U<Args> x', but U is not a template.
3048 // Assume it was supposed to be a type.
3049 DS.SetTypeSpecError();
3050 ConsumeAnnotationToken();
3051 break;
3052 }
3053
3054 if (TemplateId && TemplateId->Kind == TNK_Type_template) {
3055 // We have a qualified template-id, e.g., N::A<int>
3056
3057 // If this would be a valid constructor declaration with template
3058 // arguments, we will reject the attempt to form an invalid type-id
3059 // referring to the injected-class-name when we annotate the token,
3060 // per C++ [class.qual]p2.
3061 //
3062 // To improve diagnostics for this case, parse the declaration as a
3063 // constructor (and reject the extra template arguments later).
3064 if ((DSContext == DeclSpecContext::DSC_top_level ||
3065 DSContext == DeclSpecContext::DSC_class) &&
3066 TemplateId->Name &&
3067 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS) &&
3068 isConstructorDeclarator(/*Unqualified=*/false)) {
3069 // The user meant this to be an out-of-line constructor
3070 // definition, but template arguments are not allowed
3071 // there. Just allow this as a constructor; we'll
3072 // complain about it later.
3073 goto DoneWithDeclSpec;
3074 }
3075
3076 DS.getTypeSpecScope() = SS;
3077 ConsumeAnnotationToken(); // The C++ scope.
3078 assert(Tok.is(tok::annot_template_id) &&
3079 "ParseOptionalCXXScopeSpecifier not working");
3080 AnnotateTemplateIdTokenAsType(SS);
3081 continue;
3082 }
3083
3084 if (TemplateId && TemplateId->Kind == TNK_Concept_template &&
3085 GetLookAheadToken(2).isOneOf(tok::kw_auto, tok::kw_decltype)) {
3086 DS.getTypeSpecScope() = SS;
3087 // This is a qualified placeholder-specifier, e.g., ::C<int> auto ...
3088 // Consume the scope annotation and continue to consume the template-id
3089 // as a placeholder-specifier.
3090 ConsumeAnnotationToken();
3091 continue;
3092 }
3093
3094 if (Next.is(tok::annot_typename)) {
3095 DS.getTypeSpecScope() = SS;
3096 ConsumeAnnotationToken(); // The C++ scope.
3097 TypeResult T = getTypeAnnotation(Tok);
3098 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename,
3099 Tok.getAnnotationEndLoc(),
3100 PrevSpec, DiagID, T, Policy);
3101 if (isInvalid)
3102 break;
3103 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3104 ConsumeAnnotationToken(); // The typename
3105 }
3106
3107 if (Next.isNot(tok::identifier))
3108 goto DoneWithDeclSpec;
3109
3110 // Check whether this is a constructor declaration. If we're in a
3111 // context where the identifier could be a class name, and it has the
3112 // shape of a constructor declaration, process it as one.
3113 if ((DSContext == DeclSpecContext::DSC_top_level ||
3114 DSContext == DeclSpecContext::DSC_class) &&
3115 Actions.isCurrentClassName(*Next.getIdentifierInfo(), getCurScope(),
3116 &SS) &&
3117 isConstructorDeclarator(/*Unqualified*/ false))
3118 goto DoneWithDeclSpec;
3119
3120 ParsedType TypeRep =
3121 Actions.getTypeName(*Next.getIdentifierInfo(), Next.getLocation(),
3122 getCurScope(), &SS, false, false, nullptr,
3123 /*IsCtorOrDtorName=*/false,
3124 /*WantNontrivialTypeSourceInfo=*/true,
3125 isClassTemplateDeductionContext(DSContext));
3126
3127 // If the referenced identifier is not a type, then this declspec is
3128 // erroneous: We already checked about that it has no type specifier, and
3129 // C++ doesn't have implicit int. Diagnose it as a typo w.r.t. to the
3130 // typename.
3131 if (!TypeRep) {
3132 if (TryAnnotateTypeConstraint())
3133 goto DoneWithDeclSpec;
3134 if (Tok.isNot(tok::annot_cxxscope) ||
3135 NextToken().isNot(tok::identifier))
3136 continue;
3137 // Eat the scope spec so the identifier is current.
3138 ConsumeAnnotationToken();
3139 ParsedAttributesWithRange Attrs(AttrFactory);
3140 if (ParseImplicitInt(DS, &SS, TemplateInfo, AS, DSContext, Attrs)) {
3141 if (!Attrs.empty()) {
3142 AttrsLastTime = true;
3143 attrs.takeAllFrom(Attrs);
3144 }
3145 continue;
3146 }
3147 goto DoneWithDeclSpec;
3148 }
3149
3150 DS.getTypeSpecScope() = SS;
3151 ConsumeAnnotationToken(); // The C++ scope.
3152
3153 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3154 DiagID, TypeRep, Policy);
3155 if (isInvalid)
3156 break;
3157
3158 DS.SetRangeEnd(Tok.getLocation());
3159 ConsumeToken(); // The typename.
3160
3161 continue;
3162 }
3163
3164 case tok::annot_typename: {
3165 // If we've previously seen a tag definition, we were almost surely
3166 // missing a semicolon after it.
3167 if (DS.hasTypeSpecifier() && DS.hasTagDefinition())
3168 goto DoneWithDeclSpec;
3169
3170 TypeResult T = getTypeAnnotation(Tok);
3171 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3172 DiagID, T, Policy);
3173 if (isInvalid)
3174 break;
3175
3176 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3177 ConsumeAnnotationToken(); // The typename
3178
3179 continue;
3180 }
3181
3182 case tok::kw___is_signed:
3183 // GNU libstdc++ 4.4 uses __is_signed as an identifier, but Clang
3184 // typically treats it as a trait. If we see __is_signed as it appears
3185 // in libstdc++, e.g.,
3186 //
3187 // static const bool __is_signed;
3188 //
3189 // then treat __is_signed as an identifier rather than as a keyword.
3190 if (DS.getTypeSpecType() == TST_bool &&
3191 DS.getTypeQualifiers() == DeclSpec::TQ_const &&
3192 DS.getStorageClassSpec() == DeclSpec::SCS_static)
3193 TryKeywordIdentFallback(true);
3194
3195 // We're done with the declaration-specifiers.
3196 goto DoneWithDeclSpec;
3197
3198 // typedef-name
3199 case tok::kw___super:
3200 case tok::kw_decltype:
3201 case tok::identifier: {
3202 // This identifier can only be a typedef name if we haven't already seen
3203 // a type-specifier. Without this check we misparse:
3204 // typedef int X; struct Y { short X; }; as 'short int'.
3205 if (DS.hasTypeSpecifier())
3206 goto DoneWithDeclSpec;
3207
3208 // If the token is an identifier named "__declspec" and Microsoft
3209 // extensions are not enabled, it is likely that there will be cascading
3210 // parse errors if this really is a __declspec attribute. Attempt to
3211 // recognize that scenario and recover gracefully.
3212 if (!getLangOpts().DeclSpecKeyword && Tok.is(tok::identifier) &&
3213 Tok.getIdentifierInfo()->getName().equals("__declspec")) {
3214 Diag(Loc, diag::err_ms_attributes_not_enabled);
3215
3216 // The next token should be an open paren. If it is, eat the entire
3217 // attribute declaration and continue.
3218 if (NextToken().is(tok::l_paren)) {
3219 // Consume the __declspec identifier.
3220 ConsumeToken();
3221
3222 // Eat the parens and everything between them.
3223 BalancedDelimiterTracker T(*this, tok::l_paren);
3224 if (T.consumeOpen()) {
3225 assert(false && "Not a left paren?");
3226 return;
3227 }
3228 T.skipToEnd();
3229 continue;
3230 }
3231 }
3232
3233 // In C++, check to see if this is a scope specifier like foo::bar::, if
3234 // so handle it as such. This is important for ctor parsing.
3235 if (getLangOpts().CPlusPlus) {
3236 if (TryAnnotateCXXScopeToken(EnteringContext)) {
3237 DS.SetTypeSpecError();
3238 goto DoneWithDeclSpec;
3239 }
3240 if (!Tok.is(tok::identifier))
3241 continue;
3242 }
3243
3244 // Check for need to substitute AltiVec keyword tokens.
3245 if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid))
3246 break;
3247
3248 // [AltiVec] 2.2: [If the 'vector' specifier is used] The syntax does not
3249 // allow the use of a typedef name as a type specifier.
3250 if (DS.isTypeAltiVecVector())
3251 goto DoneWithDeclSpec;
3252
3253 if (DSContext == DeclSpecContext::DSC_objc_method_result &&
3254 isObjCInstancetype()) {
3255 ParsedType TypeRep = Actions.ActOnObjCInstanceType(Loc);
3256 assert(TypeRep);
3257 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3258 DiagID, TypeRep, Policy);
3259 if (isInvalid)
3260 break;
3261
3262 DS.SetRangeEnd(Loc);
3263 ConsumeToken();
3264 continue;
3265 }
3266
3267 // If we're in a context where the identifier could be a class name,
3268 // check whether this is a constructor declaration.
3269 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
3270 Actions.isCurrentClassName(*Tok.getIdentifierInfo(), getCurScope()) &&
3271 isConstructorDeclarator(/*Unqualified*/true))
3272 goto DoneWithDeclSpec;
3273
3274 ParsedType TypeRep = Actions.getTypeName(
3275 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), nullptr,
3276 false, false, nullptr, false, false,
3277 isClassTemplateDeductionContext(DSContext));
3278
3279 // If this is not a typedef name, don't parse it as part of the declspec,
3280 // it must be an implicit int or an error.
3281 if (!TypeRep) {
3282 if (TryAnnotateTypeConstraint())
3283 goto DoneWithDeclSpec;
3284 if (Tok.isNot(tok::identifier))
3285 continue;
3286 ParsedAttributesWithRange Attrs(AttrFactory);
3287 if (ParseImplicitInt(DS, nullptr, TemplateInfo, AS, DSContext, Attrs)) {
3288 if (!Attrs.empty()) {
3289 AttrsLastTime = true;
3290 attrs.takeAllFrom(Attrs);
3291 }
3292 continue;
3293 }
3294 goto DoneWithDeclSpec;
3295 }
3296
3297 // Likewise, if this is a context where the identifier could be a template
3298 // name, check whether this is a deduction guide declaration.
3299 if (getLangOpts().CPlusPlus17 &&
3300 (DSContext == DeclSpecContext::DSC_class ||
3301 DSContext == DeclSpecContext::DSC_top_level) &&
3302 Actions.isDeductionGuideName(getCurScope(), *Tok.getIdentifierInfo(),
3303 Tok.getLocation()) &&
3304 isConstructorDeclarator(/*Unqualified*/ true,
3305 /*DeductionGuide*/ true))
3306 goto DoneWithDeclSpec;
3307
3308 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3309 DiagID, TypeRep, Policy);
3310 if (isInvalid)
3311 break;
3312
3313 DS.SetRangeEnd(Tok.getLocation());
3314 ConsumeToken(); // The identifier
3315
3316 // Objective-C supports type arguments and protocol references
3317 // following an Objective-C object or object pointer
3318 // type. Handle either one of them.
3319 if (Tok.is(tok::less) && getLangOpts().ObjC) {
3320 SourceLocation NewEndLoc;
3321 TypeResult NewTypeRep = parseObjCTypeArgsAndProtocolQualifiers(
3322 Loc, TypeRep, /*consumeLastToken=*/true,
3323 NewEndLoc);
3324 if (NewTypeRep.isUsable()) {
3325 DS.UpdateTypeRep(NewTypeRep.get());
3326 DS.SetRangeEnd(NewEndLoc);
3327 }
3328 }
3329
3330 // Need to support trailing type qualifiers (e.g. "id<p> const").
3331 // If a type specifier follows, it will be diagnosed elsewhere.
3332 continue;
3333 }
3334
3335 // type-name or placeholder-specifier
3336 case tok::annot_template_id: {
3337 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
3338
3339 if (TemplateId->hasInvalidName()) {
3340 DS.SetTypeSpecError();
3341 break;
3342 }
3343
3344 if (TemplateId->Kind == TNK_Concept_template) {
3345 // If we've already diagnosed that this type-constraint has invalid
3346 // arguemnts, drop it and just form 'auto' or 'decltype(auto)'.
3347 if (TemplateId->hasInvalidArgs())
3348 TemplateId = nullptr;
3349
3350 if (NextToken().is(tok::identifier)) {
3351 Diag(Loc, diag::err_placeholder_expected_auto_or_decltype_auto)
3352 << FixItHint::CreateInsertion(NextToken().getLocation(), "auto");
3353 // Attempt to continue as if 'auto' was placed here.
3354 isInvalid = DS.SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID,
3355 TemplateId, Policy);
3356 break;
3357 }
3358 if (!NextToken().isOneOf(tok::kw_auto, tok::kw_decltype))
3359 goto DoneWithDeclSpec;
3360 ConsumeAnnotationToken();
3361 SourceLocation AutoLoc = Tok.getLocation();
3362 if (TryConsumeToken(tok::kw_decltype)) {
3363 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
3364 if (Tracker.consumeOpen()) {
3365 // Something like `void foo(Iterator decltype i)`
3366 Diag(Tok, diag::err_expected) << tok::l_paren;
3367 } else {
3368 if (!TryConsumeToken(tok::kw_auto)) {
3369 // Something like `void foo(Iterator decltype(int) i)`
3370 Tracker.skipToEnd();
3371 Diag(Tok, diag::err_placeholder_expected_auto_or_decltype_auto)
3372 << FixItHint::CreateReplacement(SourceRange(AutoLoc,
3373 Tok.getLocation()),
3374 "auto");
3375 } else {
3376 Tracker.consumeClose();
3377 }
3378 }
3379 ConsumedEnd = Tok.getLocation();
3380 // Even if something went wrong above, continue as if we've seen
3381 // `decltype(auto)`.
3382 isInvalid = DS.SetTypeSpecType(TST_decltype_auto, Loc, PrevSpec,
3383 DiagID, TemplateId, Policy);
3384 } else {
3385 isInvalid = DS.SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID,
3386 TemplateId, Policy);
3387 }
3388 break;
3389 }
3390
3391 if (TemplateId->Kind != TNK_Type_template &&
3392 TemplateId->Kind != TNK_Undeclared_template) {
3393 // This template-id does not refer to a type name, so we're
3394 // done with the type-specifiers.
3395 goto DoneWithDeclSpec;
3396 }
3397
3398 // If we're in a context where the template-id could be a
3399 // constructor name or specialization, check whether this is a
3400 // constructor declaration.
3401 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
3402 Actions.isCurrentClassName(*TemplateId->Name, getCurScope()) &&
3403 isConstructorDeclarator(/*Unqualified=*/true))
3404 goto DoneWithDeclSpec;
3405
3406 // Turn the template-id annotation token into a type annotation
3407 // token, then try again to parse it as a type-specifier.
3408 CXXScopeSpec SS;
3409 AnnotateTemplateIdTokenAsType(SS);
3410 continue;
3411 }
3412
3413 // GNU attributes support.
3414 case tok::kw___attribute:
3415 ParseGNUAttributes(DS.getAttributes(), nullptr, LateAttrs);
3416 continue;
3417
3418 // Microsoft declspec support.
3419 case tok::kw___declspec:
3420 ParseMicrosoftDeclSpecs(DS.getAttributes());
3421 continue;
3422
3423 // Microsoft single token adornments.
3424 case tok::kw___forceinline: {
3425 isInvalid = DS.setFunctionSpecForceInline(Loc, PrevSpec, DiagID);
3426 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
3427 SourceLocation AttrNameLoc = Tok.getLocation();
3428 DS.getAttributes().addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc,
3429 nullptr, 0, ParsedAttr::AS_Keyword);
3430 break;
3431 }
3432
3433 case tok::kw___unaligned:
3434 isInvalid = DS.SetTypeQual(DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
3435 getLangOpts());
3436 break;
3437
3438 case tok::kw___sptr:
3439 case tok::kw___uptr:
3440 case tok::kw___ptr64:
3441 case tok::kw___ptr32:
3442 case tok::kw___w64:
3443 case tok::kw___cdecl:
3444 case tok::kw___stdcall:
3445 case tok::kw___fastcall:
3446 case tok::kw___thiscall:
3447 case tok::kw___regcall:
3448 case tok::kw___vectorcall:
3449 ParseMicrosoftTypeAttributes(DS.getAttributes());
3450 continue;
3451
3452 // Borland single token adornments.
3453 case tok::kw___pascal:
3454 ParseBorlandTypeAttributes(DS.getAttributes());
3455 continue;
3456
3457 // OpenCL single token adornments.
3458 case tok::kw___kernel:
3459 ParseOpenCLKernelAttributes(DS.getAttributes());
3460 continue;
3461
3462 // Nullability type specifiers.
3463 case tok::kw__Nonnull:
3464 case tok::kw__Nullable:
3465 case tok::kw__Null_unspecified:
3466 ParseNullabilityTypeSpecifiers(DS.getAttributes());
3467 continue;
3468
3469 // Objective-C 'kindof' types.
3470 case tok::kw___kindof:
3471 DS.getAttributes().addNew(Tok.getIdentifierInfo(), Loc, nullptr, Loc,
3472 nullptr, 0, ParsedAttr::AS_Keyword);
3473 (void)ConsumeToken();
3474 continue;
3475
3476 // storage-class-specifier
3477 case tok::kw_typedef:
3478 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_typedef, Loc,
3479 PrevSpec, DiagID, Policy);
3480 isStorageClass = true;
3481 break;
3482 case tok::kw_extern:
3483 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
3484 Diag(Tok, diag::ext_thread_before) << "extern";
3485 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_extern, Loc,
3486 PrevSpec, DiagID, Policy);
3487 isStorageClass = true;
3488 break;
3489 case tok::kw___private_extern__:
3490 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_private_extern,
3491 Loc, PrevSpec, DiagID, Policy);
3492 isStorageClass = true;
3493 break;
3494 case tok::kw_static:
3495 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
3496 Diag(Tok, diag::ext_thread_before) << "static";
3497 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_static, Loc,
3498 PrevSpec, DiagID, Policy);
3499 isStorageClass = true;
3500 break;
3501 case tok::kw_auto:
3502 if (getLangOpts().CPlusPlus11) {
3503 if (isKnownToBeTypeSpecifier(GetLookAheadToken(1))) {
3504 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc,
3505 PrevSpec, DiagID, Policy);
3506 if (!isInvalid)
3507 Diag(Tok, diag::ext_auto_storage_class)
3508 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
3509 } else
3510 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto, Loc, PrevSpec,
3511 DiagID, Policy);
3512 } else
3513 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc,
3514 PrevSpec, DiagID, Policy);
3515 isStorageClass = true;
3516 break;
3517 case tok::kw___auto_type:
3518 Diag(Tok, diag::ext_auto_type);
3519 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto_type, Loc, PrevSpec,
3520 DiagID, Policy);
3521 break;
3522 case tok::kw_register:
3523 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_register, Loc,
3524 PrevSpec, DiagID, Policy);
3525 isStorageClass = true;
3526 break;
3527 case tok::kw_mutable:
3528 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_mutable, Loc,
3529 PrevSpec, DiagID, Policy);
3530 isStorageClass = true;
3531 break;
3532 case tok::kw___thread:
3533 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS___thread, Loc,
3534 PrevSpec, DiagID);
3535 isStorageClass = true;
3536 break;
3537 case tok::kw_thread_local:
3538 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS_thread_local, Loc,
3539 PrevSpec, DiagID);
3540 isStorageClass = true;
3541 break;
3542 case tok::kw__Thread_local:
3543 if (!getLangOpts().C11)
3544 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3545 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS__Thread_local,
3546 Loc, PrevSpec, DiagID);
3547 isStorageClass = true;
3548 break;
3549
3550 // function-specifier
3551 case tok::kw_inline:
3552 isInvalid = DS.setFunctionSpecInline(Loc, PrevSpec, DiagID);
3553 break;
3554 case tok::kw_virtual:
3555 // C++ for OpenCL does not allow virtual function qualifier, to avoid
3556 // function pointers restricted in OpenCL v2.0 s6.9.a.
3557 if (getLangOpts().OpenCLCPlusPlus) {
3558 DiagID = diag::err_openclcxx_virtual_function;
3559 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
3560 isInvalid = true;
3561 }
3562 else {
3563 isInvalid = DS.setFunctionSpecVirtual(Loc, PrevSpec, DiagID);
3564 }
3565 break;
3566 case tok::kw_explicit: {
3567 SourceLocation ExplicitLoc = Loc;
3568 SourceLocation CloseParenLoc;
3569 ExplicitSpecifier ExplicitSpec(nullptr, ExplicitSpecKind::ResolvedTrue);
3570 ConsumedEnd = ExplicitLoc;
3571 ConsumeToken(); // kw_explicit
3572 if (Tok.is(tok::l_paren)) {
3573 if (getLangOpts().CPlusPlus20 || isExplicitBool() == TPResult::True) {
3574 Diag(Tok.getLocation(), getLangOpts().CPlusPlus20
3575 ? diag::warn_cxx17_compat_explicit_bool
3576 : diag::ext_explicit_bool);
3577
3578 ExprResult ExplicitExpr(static_cast<Expr *>(nullptr));
3579 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
3580 Tracker.consumeOpen();
3581 ExplicitExpr = ParseConstantExpression();
3582 ConsumedEnd = Tok.getLocation();
3583 if (ExplicitExpr.isUsable()) {
3584 CloseParenLoc = Tok.getLocation();
3585 Tracker.consumeClose();
3586 ExplicitSpec =
3587 Actions.ActOnExplicitBoolSpecifier(ExplicitExpr.get());
3588 } else
3589 Tracker.skipToEnd();
3590 } else {
3591 Diag(Tok.getLocation(), diag::warn_cxx20_compat_explicit_bool);
3592 }
3593 }
3594 isInvalid = DS.setFunctionSpecExplicit(ExplicitLoc, PrevSpec, DiagID,
3595 ExplicitSpec, CloseParenLoc);
3596 break;
3597 }
3598 case tok::kw__Noreturn:
3599 if (!getLangOpts().C11)
3600 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3601 isInvalid = DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
3602 break;
3603
3604 // alignment-specifier
3605 case tok::kw__Alignas:
3606 if (!getLangOpts().C11)
3607 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3608 ParseAlignmentSpecifier(DS.getAttributes());
3609 continue;
3610
3611 // friend
3612 case tok::kw_friend:
3613 if (DSContext == DeclSpecContext::DSC_class)
3614 isInvalid = DS.SetFriendSpec(Loc, PrevSpec, DiagID);
3615 else {
3616 PrevSpec = ""; // not actually used by the diagnostic
3617 DiagID = diag::err_friend_invalid_in_context;
3618 isInvalid = true;
3619 }
3620 break;
3621
3622 // Modules
3623 case tok::kw___module_private__:
3624 isInvalid = DS.setModulePrivateSpec(Loc, PrevSpec, DiagID);
3625 break;
3626
3627 // constexpr, consteval, constinit specifiers
3628 case tok::kw_constexpr:
3629 isInvalid = DS.SetConstexprSpec(CSK_constexpr, Loc, PrevSpec, DiagID);
3630 break;
3631 case tok::kw_consteval:
3632 isInvalid = DS.SetConstexprSpec(CSK_consteval, Loc, PrevSpec, DiagID);
3633 break;
3634 case tok::kw_constinit:
3635 isInvalid = DS.SetConstexprSpec(CSK_constinit, Loc, PrevSpec, DiagID);
3636 break;
3637
3638 // type-specifier
3639 case tok::kw_short:
3640 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec,
3641 DiagID, Policy);
3642 break;
3643 case tok::kw_long:
3644 if (DS.getTypeSpecWidth() != DeclSpec::TSW_long)
3645 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec,
3646 DiagID, Policy);
3647 else
3648 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec,
3649 DiagID, Policy);
3650 break;
3651 case tok::kw___int64:
3652 isInvalid = DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec,
3653 DiagID, Policy);
3654 break;
3655 case tok::kw_signed:
3656 isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec,
3657 DiagID);
3658 break;
3659 case tok::kw_unsigned:
3660 isInvalid = DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec,
3661 DiagID);
3662 break;
3663 case tok::kw__Complex:
3664 if (!getLangOpts().C99)
3665 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3666 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec,
3667 DiagID);
3668 break;
3669 case tok::kw__Imaginary:
3670 if (!getLangOpts().C99)
3671 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3672 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec,
3673 DiagID);
3674 break;
3675 case tok::kw_void:
3676 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec,
3677 DiagID, Policy);
3678 break;
3679 case tok::kw_char:
3680 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec,
3681 DiagID, Policy);
3682 break;
3683 case tok::kw_int:
3684 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec,
3685 DiagID, Policy);
3686 break;
3687 case tok::kw__ExtInt: {
3688 ExprResult ER = ParseExtIntegerArgument();
3689 if (ER.isInvalid())
3690 continue;
3691 isInvalid = DS.SetExtIntType(Loc, ER.get(), PrevSpec, DiagID, Policy);
3692 ConsumedEnd = PrevTokLocation;
3693 break;
3694 }
3695 case tok::kw___int128:
3696 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec,
3697 DiagID, Policy);
3698 break;
3699 case tok::kw_half:
3700 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec,
3701 DiagID, Policy);
3702 break;
3703 case tok::kw___bf16:
3704 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_BFloat16, Loc, PrevSpec,
3705 DiagID, Policy);
3706 break;
3707 case tok::kw_float:
3708 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec,
3709 DiagID, Policy);
3710 break;
3711 case tok::kw_double:
3712 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec,
3713 DiagID, Policy);
3714 break;
3715 case tok::kw__Float16:
3716 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float16, Loc, PrevSpec,
3717 DiagID, Policy);
3718 break;
3719 case tok::kw__Accum:
3720 if (!getLangOpts().FixedPoint) {
3721 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3722 } else {
3723 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_accum, Loc, PrevSpec,
3724 DiagID, Policy);
3725 }
3726 break;
3727 case tok::kw__Fract:
3728 if (!getLangOpts().FixedPoint) {
3729 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3730 } else {
3731 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_fract, Loc, PrevSpec,
3732 DiagID, Policy);
3733 }
3734 break;
3735 case tok::kw__Sat:
3736 if (!getLangOpts().FixedPoint) {
3737 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3738 } else {
3739 isInvalid = DS.SetTypeSpecSat(Loc, PrevSpec, DiagID);
3740 }
3741 break;
3742 case tok::kw___float128:
3743 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float128, Loc, PrevSpec,
3744 DiagID, Policy);
3745 break;
3746 case tok::kw_wchar_t:
3747 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec,
3748 DiagID, Policy);
3749 break;
3750 case tok::kw_char8_t:
3751 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char8, Loc, PrevSpec,
3752 DiagID, Policy);
3753 break;
3754 case tok::kw_char16_t:
3755 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec,
3756 DiagID, Policy);
3757 break;
3758 case tok::kw_char32_t:
3759 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec,
3760 DiagID, Policy);
3761 break;
3762 case tok::kw_bool:
3763 case tok::kw__Bool:
3764 if (Tok.is(tok::kw__Bool) && !getLangOpts().C99)
3765 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3766
3767 if (Tok.is(tok::kw_bool) &&
3768 DS.getTypeSpecType() != DeclSpec::TST_unspecified &&
3769 DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
3770 PrevSpec = ""; // Not used by the diagnostic.
3771 DiagID = diag::err_bool_redeclaration;
3772 // For better error recovery.
3773 Tok.setKind(tok::identifier);
3774 isInvalid = true;
3775 } else {
3776 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec,
3777 DiagID, Policy);
3778 }
3779 break;
3780 case tok::kw__Decimal32:
3781 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec,
3782 DiagID, Policy);
3783 break;
3784 case tok::kw__Decimal64:
3785 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec,
3786 DiagID, Policy);
3787 break;
3788 case tok::kw__Decimal128:
3789 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec,
3790 DiagID, Policy);
3791 break;
3792 case tok::kw___vector:
3793 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy);
3794 break;
3795 case tok::kw___pixel:
3796 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy);
3797 break;
3798 case tok::kw___bool:
3799 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy);
3800 break;
3801 case tok::kw_pipe:
3802 if (!getLangOpts().OpenCL || (getLangOpts().OpenCLVersion < 200 &&
3803 !getLangOpts().OpenCLCPlusPlus)) {
3804 // OpenCL 2.0 defined this keyword. OpenCL 1.2 and earlier should
3805 // support the "pipe" word as identifier.
3806 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
3807 goto DoneWithDeclSpec;
3808 }
3809 isInvalid = DS.SetTypePipe(true, Loc, PrevSpec, DiagID, Policy);
3810 break;
3811 #define GENERIC_IMAGE_TYPE(ImgType, Id) \
3812 case tok::kw_##ImgType##_t: \
3813 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_##ImgType##_t, Loc, PrevSpec, \
3814 DiagID, Policy); \
3815 break;
3816 #include "clang/Basic/OpenCLImageTypes.def"
3817 case tok::kw___unknown_anytype:
3818 isInvalid = DS.SetTypeSpecType(TST_unknown_anytype, Loc,
3819 PrevSpec, DiagID, Policy);
3820 break;
3821
3822 // class-specifier:
3823 case tok::kw_class:
3824 case tok::kw_struct:
3825 case tok::kw___interface:
3826 case tok::kw_union: {
3827 tok::TokenKind Kind = Tok.getKind();
3828 ConsumeToken();
3829
3830 // These are attributes following class specifiers.
3831 // To produce better diagnostic, we parse them when
3832 // parsing class specifier.
3833 ParsedAttributesWithRange Attributes(AttrFactory);
3834 ParseClassSpecifier(Kind, Loc, DS, TemplateInfo, AS,
3835 EnteringContext, DSContext, Attributes);
3836
3837 // If there are attributes following class specifier,
3838 // take them over and handle them here.
3839 if (!Attributes.empty()) {
3840 AttrsLastTime = true;
3841 attrs.takeAllFrom(Attributes);
3842 }
3843 continue;
3844 }
3845
3846 // enum-specifier:
3847 case tok::kw_enum:
3848 ConsumeToken();
3849 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS, DSContext);
3850 continue;
3851
3852 // cv-qualifier:
3853 case tok::kw_const:
3854 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const, Loc, PrevSpec, DiagID,
3855 getLangOpts());
3856 break;
3857 case tok::kw_volatile:
3858 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
3859 getLangOpts());
3860 break;
3861 case tok::kw_restrict:
3862 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
3863 getLangOpts());
3864 break;
3865 case tok::kw___cheri_input:
3866 isInvalid = DS.SetInput(PrevSpec, DiagID);
3867 break;
3868 case tok::kw___cheri_output:
3869 isInvalid = DS.SetOutput(PrevSpec, DiagID);
3870 break;
3871
3872 // C++ typename-specifier:
3873 case tok::kw_typename:
3874 if (TryAnnotateTypeOrScopeToken()) {
3875 DS.SetTypeSpecError();
3876 goto DoneWithDeclSpec;
3877 }
3878 if (!Tok.is(tok::kw_typename))
3879 continue;
3880 break;
3881
3882 // GNU typeof support.
3883 case tok::kw_typeof:
3884 ParseTypeofSpecifier(DS);
3885 continue;
3886
3887 case tok::annot_decltype:
3888 ParseDecltypeSpecifier(DS);
3889 continue;
3890
3891 case tok::annot_pragma_pack:
3892 HandlePragmaPack();
3893 continue;
3894
3895 case tok::annot_pragma_ms_pragma:
3896 HandlePragmaMSPragma();
3897 continue;
3898
3899 case tok::annot_pragma_ms_vtordisp:
3900 HandlePragmaMSVtorDisp();
3901 continue;
3902
3903 case tok::annot_pragma_ms_pointers_to_members:
3904 HandlePragmaMSPointersToMembers();
3905 continue;
3906
3907 case tok::kw___underlying_type:
3908 ParseUnderlyingTypeSpecifier(DS);
3909 continue;
3910
3911 case tok::kw__Atomic:
3912 // C11 6.7.2.4/4:
3913 // If the _Atomic keyword is immediately followed by a left parenthesis,
3914 // it is interpreted as a type specifier (with a type name), not as a
3915 // type qualifier.
3916 if (!getLangOpts().C11)
3917 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3918
3919 if (NextToken().is(tok::l_paren)) {
3920 ParseAtomicSpecifier(DS);
3921 continue;
3922 }
3923 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
3924 getLangOpts());
3925 break;
3926
3927 // OpenCL address space qualifiers:
3928 case tok::kw___generic:
3929 // generic address space is introduced only in OpenCL v2.0
3930 // see OpenCL C Spec v2.0 s6.5.5
3931 if (Actions.getLangOpts().OpenCLVersion < 200 &&
3932 !Actions.getLangOpts().OpenCLCPlusPlus) {
3933 DiagID = diag::err_opencl_unknown_type_specifier;
3934 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
3935 isInvalid = true;
3936 break;
3937 }
3938 LLVM_FALLTHROUGH;
3939 case tok::kw_private:
3940 // It's fine (but redundant) to check this for __generic on the
3941 // fallthrough path; we only form the __generic token in OpenCL mode.
3942 if (!getLangOpts().OpenCL)
3943 goto DoneWithDeclSpec;
3944 LLVM_FALLTHROUGH;
3945 case tok::kw___private:
3946 case tok::kw___global:
3947 case tok::kw___local:
3948 case tok::kw___constant:
3949 // OpenCL access qualifiers:
3950 case tok::kw___read_only:
3951 case tok::kw___write_only:
3952 case tok::kw___read_write:
3953 ParseOpenCLQualifiers(DS.getAttributes());
3954 break;
3955
3956 case tok::less:
3957 // GCC ObjC supports types like "<SomeProtocol>" as a synonym for
3958 // "id<SomeProtocol>". This is hopelessly old fashioned and dangerous,
3959 // but we support it.
3960 if (DS.hasTypeSpecifier() || !getLangOpts().ObjC)
3961 goto DoneWithDeclSpec;
3962
3963 SourceLocation StartLoc = Tok.getLocation();
3964 SourceLocation EndLoc;
3965 TypeResult Type = parseObjCProtocolQualifierType(EndLoc);
3966 if (Type.isUsable()) {
3967 if (DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, StartLoc,
3968 PrevSpec, DiagID, Type.get(),
3969 Actions.getASTContext().getPrintingPolicy()))
3970 Diag(StartLoc, DiagID) << PrevSpec;
3971
3972 DS.SetRangeEnd(EndLoc);
3973 } else {
3974 DS.SetTypeSpecError();
3975 }
3976
3977 // Need to support trailing type qualifiers (e.g. "id<p> const").
3978 // If a type specifier follows, it will be diagnosed elsewhere.
3979 continue;
3980 }
3981
3982 DS.SetRangeEnd(ConsumedEnd.isValid() ? ConsumedEnd : Tok.getLocation());
3983
3984 // If the specifier wasn't legal, issue a diagnostic.
3985 if (isInvalid) {
3986 assert(PrevSpec && "Method did not return previous specifier!");
3987 assert(DiagID);
3988
3989 if (DiagID == diag::ext_duplicate_declspec ||
3990 DiagID == diag::ext_warn_duplicate_declspec ||
3991 DiagID == diag::err_duplicate_declspec)
3992 Diag(Loc, DiagID) << PrevSpec
3993 << FixItHint::CreateRemoval(
3994 SourceRange(Loc, DS.getEndLoc()));
3995 else if (DiagID == diag::err_opencl_unknown_type_specifier) {
3996 Diag(Loc, DiagID) << getLangOpts().OpenCLCPlusPlus
3997 << getLangOpts().getOpenCLVersionTuple().getAsString()
3998 << PrevSpec << isStorageClass;
3999 } else
4000 Diag(Loc, DiagID) << PrevSpec;
4001 }
4002
4003 if (DiagID != diag::err_bool_redeclaration && ConsumedEnd.isInvalid())
4004 // After an error the next token can be an annotation token.
4005 ConsumeAnyToken();
4006
4007 AttrsLastTime = false;
4008 }
4009 }
4010
4011 /// ParseStructDeclaration - Parse a struct declaration without the terminating
4012 /// semicolon.
4013 ///
4014 /// Note that a struct declaration refers to a declaration in a struct,
4015 /// not to the declaration of a struct.
4016 ///
4017 /// struct-declaration:
4018 /// [C2x] attributes-specifier-seq[opt]
4019 /// specifier-qualifier-list struct-declarator-list
4020 /// [GNU] __extension__ struct-declaration
4021 /// [GNU] specifier-qualifier-list
4022 /// struct-declarator-list:
4023 /// struct-declarator
4024 /// struct-declarator-list ',' struct-declarator
4025 /// [GNU] struct-declarator-list ',' attributes[opt] struct-declarator
4026 /// struct-declarator:
4027 /// declarator
4028 /// [GNU] declarator attributes[opt]
4029 /// declarator[opt] ':' constant-expression
4030 /// [GNU] declarator[opt] ':' constant-expression attributes[opt]
4031 ///
ParseStructDeclaration(ParsingDeclSpec & DS,llvm::function_ref<void (ParsingFieldDeclarator &)> FieldsCallback)4032 void Parser::ParseStructDeclaration(
4033 ParsingDeclSpec &DS,
4034 llvm::function_ref<void(ParsingFieldDeclarator &)> FieldsCallback) {
4035
4036 if (Tok.is(tok::kw___extension__)) {
4037 // __extension__ silences extension warnings in the subexpression.
4038 ExtensionRAIIObject O(Diags); // Use RAII to do this.
4039 ConsumeToken();
4040 return ParseStructDeclaration(DS, FieldsCallback);
4041 }
4042
4043 // Parse leading attributes.
4044 ParsedAttributesWithRange Attrs(AttrFactory);
4045 MaybeParseCXX11Attributes(Attrs);
4046 DS.takeAttributesFrom(Attrs);
4047
4048 // Parse the common specifier-qualifiers-list piece.
4049 ParseSpecifierQualifierList(DS);
4050
4051 // If there are no declarators, this is a free-standing declaration
4052 // specifier. Let the actions module cope with it.
4053 if (Tok.is(tok::semi)) {
4054 RecordDecl *AnonRecord = nullptr;
4055 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
4056 DS, AnonRecord);
4057 assert(!AnonRecord && "Did not expect anonymous struct or union here");
4058 DS.complete(TheDecl);
4059 return;
4060 }
4061
4062 // Read struct-declarators until we find the semicolon.
4063 bool FirstDeclarator = true;
4064 SourceLocation CommaLoc;
4065 while (1) {
4066 ParsingFieldDeclarator DeclaratorInfo(*this, DS);
4067 DeclaratorInfo.D.setCommaLoc(CommaLoc);
4068
4069 // Attributes are only allowed here on successive declarators.
4070 if (!FirstDeclarator)
4071 MaybeParseGNUAttributes(DeclaratorInfo.D);
4072
4073 /// struct-declarator: declarator
4074 /// struct-declarator: declarator[opt] ':' constant-expression
4075 if (Tok.isNot(tok::colon)) {
4076 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
4077 ColonProtectionRAIIObject X(*this);
4078 ParseDeclarator(DeclaratorInfo.D);
4079 } else
4080 DeclaratorInfo.D.SetIdentifier(nullptr, Tok.getLocation());
4081
4082 if (TryConsumeToken(tok::colon)) {
4083 ExprResult Res(ParseConstantExpression());
4084 if (Res.isInvalid())
4085 SkipUntil(tok::semi, StopBeforeMatch);
4086 else
4087 DeclaratorInfo.BitfieldSize = Res.get();
4088 }
4089
4090 // If attributes exist after the declarator, parse them.
4091 MaybeParseGNUAttributes(DeclaratorInfo.D);
4092
4093 // We're done with this declarator; invoke the callback.
4094 FieldsCallback(DeclaratorInfo);
4095
4096 // If we don't have a comma, it is either the end of the list (a ';')
4097 // or an error, bail out.
4098 if (!TryConsumeToken(tok::comma, CommaLoc))
4099 return;
4100
4101 FirstDeclarator = false;
4102 }
4103 }
4104
4105 /// ParseStructUnionBody
4106 /// struct-contents:
4107 /// struct-declaration-list
4108 /// [EXT] empty
4109 /// [GNU] "struct-declaration-list" without terminatoring ';'
4110 /// struct-declaration-list:
4111 /// struct-declaration
4112 /// struct-declaration-list struct-declaration
4113 /// [OBC] '@' 'defs' '(' class-name ')'
4114 ///
ParseStructUnionBody(SourceLocation RecordLoc,DeclSpec::TST TagType,RecordDecl * TagDecl)4115 void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
4116 DeclSpec::TST TagType, RecordDecl *TagDecl) {
4117 PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
4118 "parsing struct/union body");
4119 assert(!getLangOpts().CPlusPlus && "C++ declarations not supported");
4120
4121 BalancedDelimiterTracker T(*this, tok::l_brace);
4122 if (T.consumeOpen())
4123 return;
4124
4125 ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope);
4126 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
4127
4128 // While we still have something to read, read the declarations in the struct.
4129 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
4130 Tok.isNot(tok::eof)) {
4131 // Each iteration of this loop reads one struct-declaration.
4132
4133 // Check for extraneous top-level semicolon.
4134 if (Tok.is(tok::semi)) {
4135 ConsumeExtraSemi(InsideStruct, TagType);
4136 continue;
4137 }
4138
4139 // Parse _Static_assert declaration.
4140 if (Tok.is(tok::kw__Static_assert)) {
4141 SourceLocation DeclEnd;
4142 ParseStaticAssertDeclaration(DeclEnd);
4143 continue;
4144 }
4145
4146 if (Tok.is(tok::annot_pragma_pack)) {
4147 HandlePragmaPack();
4148 continue;
4149 }
4150
4151 if (Tok.is(tok::annot_pragma_align)) {
4152 HandlePragmaAlign();
4153 continue;
4154 }
4155
4156 if (Tok.is(tok::annot_pragma_openmp)) {
4157 // Result can be ignored, because it must be always empty.
4158 AccessSpecifier AS = AS_none;
4159 ParsedAttributesWithRange Attrs(AttrFactory);
4160 (void)ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs);
4161 continue;
4162 }
4163
4164 if (tok::isPragmaAnnotation(Tok.getKind())) {
4165 Diag(Tok.getLocation(), diag::err_pragma_misplaced_in_decl)
4166 << DeclSpec::getSpecifierName(
4167 TagType, Actions.getASTContext().getPrintingPolicy());
4168 ConsumeAnnotationToken();
4169 continue;
4170 }
4171
4172 if (!Tok.is(tok::at)) {
4173 auto CFieldCallback = [&](ParsingFieldDeclarator &FD) {
4174 // Install the declarator into the current TagDecl.
4175 Decl *Field =
4176 Actions.ActOnField(getCurScope(), TagDecl,
4177 FD.D.getDeclSpec().getSourceRange().getBegin(),
4178 FD.D, FD.BitfieldSize);
4179 FD.complete(Field);
4180 };
4181
4182 // Parse all the comma separated declarators.
4183 ParsingDeclSpec DS(*this);
4184 ParseStructDeclaration(DS, CFieldCallback);
4185 } else { // Handle @defs
4186 ConsumeToken();
4187 if (!Tok.isObjCAtKeyword(tok::objc_defs)) {
4188 Diag(Tok, diag::err_unexpected_at);
4189 SkipUntil(tok::semi);
4190 continue;
4191 }
4192 ConsumeToken();
4193 ExpectAndConsume(tok::l_paren);
4194 if (!Tok.is(tok::identifier)) {
4195 Diag(Tok, diag::err_expected) << tok::identifier;
4196 SkipUntil(tok::semi);
4197 continue;
4198 }
4199 SmallVector<Decl *, 16> Fields;
4200 Actions.ActOnDefs(getCurScope(), TagDecl, Tok.getLocation(),
4201 Tok.getIdentifierInfo(), Fields);
4202 ConsumeToken();
4203 ExpectAndConsume(tok::r_paren);
4204 }
4205
4206 if (TryConsumeToken(tok::semi))
4207 continue;
4208
4209 if (Tok.is(tok::r_brace)) {
4210 ExpectAndConsume(tok::semi, diag::ext_expected_semi_decl_list);
4211 break;
4212 }
4213
4214 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list);
4215 // Skip to end of block or statement to avoid ext-warning on extra ';'.
4216 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
4217 // If we stopped at a ';', eat it.
4218 TryConsumeToken(tok::semi);
4219 }
4220
4221 T.consumeClose();
4222
4223 ParsedAttributes attrs(AttrFactory);
4224 // If attributes exist after struct contents, parse them.
4225 MaybeParseGNUAttributes(attrs);
4226
4227 SmallVector<Decl *, 32> FieldDecls(TagDecl->field_begin(),
4228 TagDecl->field_end());
4229
4230 Actions.ActOnFields(getCurScope(), RecordLoc, TagDecl, FieldDecls,
4231 T.getOpenLocation(), T.getCloseLocation(), attrs);
4232 StructScope.Exit();
4233 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());
4234 }
4235
4236 /// ParseEnumSpecifier
4237 /// enum-specifier: [C99 6.7.2.2]
4238 /// 'enum' identifier[opt] '{' enumerator-list '}'
4239 ///[C99/C++]'enum' identifier[opt] '{' enumerator-list ',' '}'
4240 /// [GNU] 'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt]
4241 /// '}' attributes[opt]
4242 /// [MS] 'enum' __declspec[opt] identifier[opt] '{' enumerator-list ',' [opt]
4243 /// '}'
4244 /// 'enum' identifier
4245 /// [GNU] 'enum' attributes[opt] identifier
4246 ///
4247 /// [C++11] enum-head '{' enumerator-list[opt] '}'
4248 /// [C++11] enum-head '{' enumerator-list ',' '}'
4249 ///
4250 /// enum-head: [C++11]
4251 /// enum-key attribute-specifier-seq[opt] identifier[opt] enum-base[opt]
4252 /// enum-key attribute-specifier-seq[opt] nested-name-specifier
4253 /// identifier enum-base[opt]
4254 ///
4255 /// enum-key: [C++11]
4256 /// 'enum'
4257 /// 'enum' 'class'
4258 /// 'enum' 'struct'
4259 ///
4260 /// enum-base: [C++11]
4261 /// ':' type-specifier-seq
4262 ///
4263 /// [C++] elaborated-type-specifier:
4264 /// [C++] 'enum' nested-name-specifier[opt] identifier
4265 ///
ParseEnumSpecifier(SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSC)4266 void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
4267 const ParsedTemplateInfo &TemplateInfo,
4268 AccessSpecifier AS, DeclSpecContext DSC) {
4269 // Parse the tag portion of this.
4270 if (Tok.is(tok::code_completion)) {
4271 // Code completion for an enum name.
4272 Actions.CodeCompleteTag(getCurScope(), DeclSpec::TST_enum);
4273 return cutOffParsing();
4274 }
4275
4276 // If attributes exist after tag, parse them.
4277 ParsedAttributesWithRange attrs(AttrFactory);
4278 MaybeParseGNUAttributes(attrs);
4279 MaybeParseCXX11Attributes(attrs);
4280 MaybeParseMicrosoftDeclSpecs(attrs);
4281
4282 SourceLocation ScopedEnumKWLoc;
4283 bool IsScopedUsingClassTag = false;
4284
4285 // In C++11, recognize 'enum class' and 'enum struct'.
4286 if (Tok.isOneOf(tok::kw_class, tok::kw_struct)) {
4287 Diag(Tok, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_scoped_enum
4288 : diag::ext_scoped_enum);
4289 IsScopedUsingClassTag = Tok.is(tok::kw_class);
4290 ScopedEnumKWLoc = ConsumeToken();
4291
4292 // Attributes are not allowed between these keywords. Diagnose,
4293 // but then just treat them like they appeared in the right place.
4294 ProhibitAttributes(attrs);
4295
4296 // They are allowed afterwards, though.
4297 MaybeParseGNUAttributes(attrs);
4298 MaybeParseCXX11Attributes(attrs);
4299 MaybeParseMicrosoftDeclSpecs(attrs);
4300 }
4301
4302 // C++11 [temp.explicit]p12:
4303 // The usual access controls do not apply to names used to specify
4304 // explicit instantiations.
4305 // We extend this to also cover explicit specializations. Note that
4306 // we don't suppress if this turns out to be an elaborated type
4307 // specifier.
4308 bool shouldDelayDiagsInTag =
4309 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
4310 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
4311 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
4312
4313 // Determine whether this declaration is permitted to have an enum-base.
4314 AllowDefiningTypeSpec AllowEnumSpecifier =
4315 isDefiningTypeSpecifierContext(DSC);
4316 bool CanBeOpaqueEnumDeclaration =
4317 DS.isEmpty() && isOpaqueEnumDeclarationContext(DSC);
4318 bool CanHaveEnumBase = (getLangOpts().CPlusPlus11 || getLangOpts().ObjC ||
4319 getLangOpts().MicrosoftExt) &&
4320 (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes ||
4321 CanBeOpaqueEnumDeclaration);
4322
4323 CXXScopeSpec &SS = DS.getTypeSpecScope();
4324 if (getLangOpts().CPlusPlus) {
4325 // "enum foo : bar;" is not a potential typo for "enum foo::bar;".
4326 ColonProtectionRAIIObject X(*this);
4327
4328 CXXScopeSpec Spec;
4329 if (ParseOptionalCXXScopeSpecifier(Spec, /*ObjectType=*/nullptr,
4330 /*ObjectHadErrors=*/false,
4331 /*EnteringContext=*/true))
4332 return;
4333
4334 if (Spec.isSet() && Tok.isNot(tok::identifier)) {
4335 Diag(Tok, diag::err_expected) << tok::identifier;
4336 if (Tok.isNot(tok::l_brace)) {
4337 // Has no name and is not a definition.
4338 // Skip the rest of this declarator, up until the comma or semicolon.
4339 SkipUntil(tok::comma, StopAtSemi);
4340 return;
4341 }
4342 }
4343
4344 SS = Spec;
4345 }
4346
4347 // Must have either 'enum name' or 'enum {...}' or (rarely) 'enum : T { ... }'.
4348 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace) &&
4349 Tok.isNot(tok::colon)) {
4350 Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
4351
4352 // Skip the rest of this declarator, up until the comma or semicolon.
4353 SkipUntil(tok::comma, StopAtSemi);
4354 return;
4355 }
4356
4357 // If an identifier is present, consume and remember it.
4358 IdentifierInfo *Name = nullptr;
4359 SourceLocation NameLoc;
4360 if (Tok.is(tok::identifier)) {
4361 Name = Tok.getIdentifierInfo();
4362 NameLoc = ConsumeToken();
4363 }
4364
4365 if (!Name && ScopedEnumKWLoc.isValid()) {
4366 // C++0x 7.2p2: The optional identifier shall not be omitted in the
4367 // declaration of a scoped enumeration.
4368 Diag(Tok, diag::err_scoped_enum_missing_identifier);
4369 ScopedEnumKWLoc = SourceLocation();
4370 IsScopedUsingClassTag = false;
4371 }
4372
4373 // Okay, end the suppression area. We'll decide whether to emit the
4374 // diagnostics in a second.
4375 if (shouldDelayDiagsInTag)
4376 diagsFromTag.done();
4377
4378 TypeResult BaseType;
4379 SourceRange BaseRange;
4380
4381 bool CanBeBitfield = (getCurScope()->getFlags() & Scope::ClassScope) &&
4382 ScopedEnumKWLoc.isInvalid() && Name;
4383
4384 // Parse the fixed underlying type.
4385 if (Tok.is(tok::colon)) {
4386 // This might be an enum-base or part of some unrelated enclosing context.
4387 //
4388 // 'enum E : base' is permitted in two circumstances:
4389 //
4390 // 1) As a defining-type-specifier, when followed by '{'.
4391 // 2) As the sole constituent of a complete declaration -- when DS is empty
4392 // and the next token is ';'.
4393 //
4394 // The restriction to defining-type-specifiers is important to allow parsing
4395 // a ? new enum E : int{}
4396 // _Generic(a, enum E : int{})
4397 // properly.
4398 //
4399 // One additional consideration applies:
4400 //
4401 // C++ [dcl.enum]p1:
4402 // A ':' following "enum nested-name-specifier[opt] identifier" within
4403 // the decl-specifier-seq of a member-declaration is parsed as part of
4404 // an enum-base.
4405 //
4406 // Other language modes supporting enumerations with fixed underlying types
4407 // do not have clear rules on this, so we disambiguate to determine whether
4408 // the tokens form a bit-field width or an enum-base.
4409
4410 if (CanBeBitfield && !isEnumBase(CanBeOpaqueEnumDeclaration)) {
4411 // Outside C++11, do not interpret the tokens as an enum-base if they do
4412 // not make sense as one. In C++11, it's an error if this happens.
4413 if (getLangOpts().CPlusPlus11)
4414 Diag(Tok.getLocation(), diag::err_anonymous_enum_bitfield);
4415 } else if (CanHaveEnumBase || !ColonIsSacred) {
4416 SourceLocation ColonLoc = ConsumeToken();
4417
4418 // Parse a type-specifier-seq as a type. We can't just ParseTypeName here,
4419 // because under -fms-extensions,
4420 // enum E : int *p;
4421 // declares 'enum E : int; E *p;' not 'enum E : int*; E p;'.
4422 DeclSpec DS(AttrFactory);
4423 ParseSpecifierQualifierList(DS, AS, DeclSpecContext::DSC_type_specifier);
4424 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeNameContext);
4425 BaseType = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
4426
4427 BaseRange = SourceRange(ColonLoc, DeclaratorInfo.getSourceRange().getEnd());
4428
4429 if (!getLangOpts().ObjC) {
4430 if (getLangOpts().CPlusPlus11)
4431 Diag(ColonLoc, diag::warn_cxx98_compat_enum_fixed_underlying_type)
4432 << BaseRange;
4433 else if (getLangOpts().CPlusPlus)
4434 Diag(ColonLoc, diag::ext_cxx11_enum_fixed_underlying_type)
4435 << BaseRange;
4436 else if (getLangOpts().MicrosoftExt)
4437 Diag(ColonLoc, diag::ext_ms_c_enum_fixed_underlying_type)
4438 << BaseRange;
4439 else
4440 Diag(ColonLoc, diag::ext_clang_c_enum_fixed_underlying_type)
4441 << BaseRange;
4442 }
4443 }
4444 }
4445
4446 // There are four options here. If we have 'friend enum foo;' then this is a
4447 // friend declaration, and cannot have an accompanying definition. If we have
4448 // 'enum foo;', then this is a forward declaration. If we have
4449 // 'enum foo {...' then this is a definition. Otherwise we have something
4450 // like 'enum foo xyz', a reference.
4451 //
4452 // This is needed to handle stuff like this right (C99 6.7.2.3p11):
4453 // enum foo {..}; void bar() { enum foo; } <- new foo in bar.
4454 // enum foo {..}; void bar() { enum foo x; } <- use of old foo.
4455 //
4456 Sema::TagUseKind TUK;
4457 if (AllowEnumSpecifier == AllowDefiningTypeSpec::No)
4458 TUK = Sema::TUK_Reference;
4459 else if (Tok.is(tok::l_brace)) {
4460 if (DS.isFriendSpecified()) {
4461 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
4462 << SourceRange(DS.getFriendSpecLoc());
4463 ConsumeBrace();
4464 SkipUntil(tok::r_brace, StopAtSemi);
4465 // Discard any other definition-only pieces.
4466 attrs.clear();
4467 ScopedEnumKWLoc = SourceLocation();
4468 IsScopedUsingClassTag = false;
4469 BaseType = TypeResult();
4470 TUK = Sema::TUK_Friend;
4471 } else {
4472 TUK = Sema::TUK_Definition;
4473 }
4474 } else if (!isTypeSpecifier(DSC) &&
4475 (Tok.is(tok::semi) ||
4476 (Tok.isAtStartOfLine() &&
4477 !isValidAfterTypeSpecifier(CanBeBitfield)))) {
4478 // An opaque-enum-declaration is required to be standalone (no preceding or
4479 // following tokens in the declaration). Sema enforces this separately by
4480 // diagnosing anything else in the DeclSpec.
4481 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
4482 if (Tok.isNot(tok::semi)) {
4483 // A semicolon was missing after this declaration. Diagnose and recover.
4484 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum");
4485 PP.EnterToken(Tok, /*IsReinject=*/true);
4486 Tok.setKind(tok::semi);
4487 }
4488 } else {
4489 TUK = Sema::TUK_Reference;
4490 }
4491
4492 bool IsElaboratedTypeSpecifier =
4493 TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend;
4494
4495 // If this is an elaborated type specifier nested in a larger declaration,
4496 // and we delayed diagnostics before, just merge them into the current pool.
4497 if (TUK == Sema::TUK_Reference && shouldDelayDiagsInTag) {
4498 diagsFromTag.redelay();
4499 }
4500
4501 MultiTemplateParamsArg TParams;
4502 if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
4503 TUK != Sema::TUK_Reference) {
4504 if (!getLangOpts().CPlusPlus11 || !SS.isSet()) {
4505 // Skip the rest of this declarator, up until the comma or semicolon.
4506 Diag(Tok, diag::err_enum_template);
4507 SkipUntil(tok::comma, StopAtSemi);
4508 return;
4509 }
4510
4511 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
4512 // Enumerations can't be explicitly instantiated.
4513 DS.SetTypeSpecError();
4514 Diag(StartLoc, diag::err_explicit_instantiation_enum);
4515 return;
4516 }
4517
4518 assert(TemplateInfo.TemplateParams && "no template parameters");
4519 TParams = MultiTemplateParamsArg(TemplateInfo.TemplateParams->data(),
4520 TemplateInfo.TemplateParams->size());
4521 }
4522
4523 if (!Name && TUK != Sema::TUK_Definition) {
4524 Diag(Tok, diag::err_enumerator_unnamed_no_def);
4525
4526 // Skip the rest of this declarator, up until the comma or semicolon.
4527 SkipUntil(tok::comma, StopAtSemi);
4528 return;
4529 }
4530
4531 // An elaborated-type-specifier has a much more constrained grammar:
4532 //
4533 // 'enum' nested-name-specifier[opt] identifier
4534 //
4535 // If we parsed any other bits, reject them now.
4536 //
4537 // MSVC and (for now at least) Objective-C permit a full enum-specifier
4538 // or opaque-enum-declaration anywhere.
4539 if (IsElaboratedTypeSpecifier && !getLangOpts().MicrosoftExt &&
4540 !getLangOpts().ObjC) {
4541 ProhibitAttributes(attrs);
4542 if (BaseType.isUsable())
4543 Diag(BaseRange.getBegin(), diag::ext_enum_base_in_type_specifier)
4544 << (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes) << BaseRange;
4545 else if (ScopedEnumKWLoc.isValid())
4546 Diag(ScopedEnumKWLoc, diag::ext_elaborated_enum_class)
4547 << FixItHint::CreateRemoval(ScopedEnumKWLoc) << IsScopedUsingClassTag;
4548 }
4549
4550 stripTypeAttributesOffDeclSpec(attrs, DS, TUK);
4551
4552 Sema::SkipBodyInfo SkipBody;
4553 if (!Name && TUK == Sema::TUK_Definition && Tok.is(tok::l_brace) &&
4554 NextToken().is(tok::identifier))
4555 SkipBody = Actions.shouldSkipAnonEnumBody(getCurScope(),
4556 NextToken().getIdentifierInfo(),
4557 NextToken().getLocation());
4558
4559 bool Owned = false;
4560 bool IsDependent = false;
4561 const char *PrevSpec = nullptr;
4562 unsigned DiagID;
4563 Decl *TagDecl = Actions.ActOnTag(
4564 getCurScope(), DeclSpec::TST_enum, TUK, StartLoc, SS, Name, NameLoc,
4565 attrs, AS, DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent,
4566 ScopedEnumKWLoc, IsScopedUsingClassTag, BaseType,
4567 DSC == DeclSpecContext::DSC_type_specifier,
4568 DSC == DeclSpecContext::DSC_template_param ||
4569 DSC == DeclSpecContext::DSC_template_type_arg,
4570 &SkipBody);
4571
4572 if (SkipBody.ShouldSkip) {
4573 assert(TUK == Sema::TUK_Definition && "can only skip a definition");
4574
4575 BalancedDelimiterTracker T(*this, tok::l_brace);
4576 T.consumeOpen();
4577 T.skipToEnd();
4578
4579 if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc,
4580 NameLoc.isValid() ? NameLoc : StartLoc,
4581 PrevSpec, DiagID, TagDecl, Owned,
4582 Actions.getASTContext().getPrintingPolicy()))
4583 Diag(StartLoc, DiagID) << PrevSpec;
4584 return;
4585 }
4586
4587 if (IsDependent) {
4588 // This enum has a dependent nested-name-specifier. Handle it as a
4589 // dependent tag.
4590 if (!Name) {
4591 DS.SetTypeSpecError();
4592 Diag(Tok, diag::err_expected_type_name_after_typename);
4593 return;
4594 }
4595
4596 TypeResult Type = Actions.ActOnDependentTag(
4597 getCurScope(), DeclSpec::TST_enum, TUK, SS, Name, StartLoc, NameLoc);
4598 if (Type.isInvalid()) {
4599 DS.SetTypeSpecError();
4600 return;
4601 }
4602
4603 if (DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
4604 NameLoc.isValid() ? NameLoc : StartLoc,
4605 PrevSpec, DiagID, Type.get(),
4606 Actions.getASTContext().getPrintingPolicy()))
4607 Diag(StartLoc, DiagID) << PrevSpec;
4608
4609 return;
4610 }
4611
4612 if (!TagDecl) {
4613 // The action failed to produce an enumeration tag. If this is a
4614 // definition, consume the entire definition.
4615 if (Tok.is(tok::l_brace) && TUK != Sema::TUK_Reference) {
4616 ConsumeBrace();
4617 SkipUntil(tok::r_brace, StopAtSemi);
4618 }
4619
4620 DS.SetTypeSpecError();
4621 return;
4622 }
4623
4624 if (Tok.is(tok::l_brace) && TUK == Sema::TUK_Definition) {
4625 Decl *D = SkipBody.CheckSameAsPrevious ? SkipBody.New : TagDecl;
4626 ParseEnumBody(StartLoc, D);
4627 if (SkipBody.CheckSameAsPrevious &&
4628 !Actions.ActOnDuplicateDefinition(DS, TagDecl, SkipBody)) {
4629 DS.SetTypeSpecError();
4630 return;
4631 }
4632 }
4633
4634 if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc,
4635 NameLoc.isValid() ? NameLoc : StartLoc,
4636 PrevSpec, DiagID, TagDecl, Owned,
4637 Actions.getASTContext().getPrintingPolicy()))
4638 Diag(StartLoc, DiagID) << PrevSpec;
4639 }
4640
4641 /// ParseEnumBody - Parse a {} enclosed enumerator-list.
4642 /// enumerator-list:
4643 /// enumerator
4644 /// enumerator-list ',' enumerator
4645 /// enumerator:
4646 /// enumeration-constant attributes[opt]
4647 /// enumeration-constant attributes[opt] '=' constant-expression
4648 /// enumeration-constant:
4649 /// identifier
4650 ///
ParseEnumBody(SourceLocation StartLoc,Decl * EnumDecl)4651 void Parser::ParseEnumBody(SourceLocation StartLoc, Decl *EnumDecl) {
4652 // Enter the scope of the enum body and start the definition.
4653 ParseScope EnumScope(this, Scope::DeclScope | Scope::EnumScope);
4654 Actions.ActOnTagStartDefinition(getCurScope(), EnumDecl);
4655
4656 BalancedDelimiterTracker T(*this, tok::l_brace);
4657 T.consumeOpen();
4658
4659 // C does not allow an empty enumerator-list, C++ does [dcl.enum].
4660 if (Tok.is(tok::r_brace) && !getLangOpts().CPlusPlus)
4661 Diag(Tok, diag::err_empty_enum);
4662
4663 SmallVector<Decl *, 32> EnumConstantDecls;
4664 SmallVector<SuppressAccessChecks, 32> EnumAvailabilityDiags;
4665
4666 Decl *LastEnumConstDecl = nullptr;
4667
4668 // Parse the enumerator-list.
4669 while (Tok.isNot(tok::r_brace)) {
4670 // Parse enumerator. If failed, try skipping till the start of the next
4671 // enumerator definition.
4672 if (Tok.isNot(tok::identifier)) {
4673 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4674 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch) &&
4675 TryConsumeToken(tok::comma))
4676 continue;
4677 break;
4678 }
4679 IdentifierInfo *Ident = Tok.getIdentifierInfo();
4680 SourceLocation IdentLoc = ConsumeToken();
4681
4682 // If attributes exist after the enumerator, parse them.
4683 ParsedAttributesWithRange attrs(AttrFactory);
4684 MaybeParseGNUAttributes(attrs);
4685 ProhibitAttributes(attrs); // GNU-style attributes are prohibited.
4686 if (standardAttributesAllowed() && isCXX11AttributeSpecifier()) {
4687 if (getLangOpts().CPlusPlus)
4688 Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
4689 ? diag::warn_cxx14_compat_ns_enum_attribute
4690 : diag::ext_ns_enum_attribute)
4691 << 1 /*enumerator*/;
4692 ParseCXX11Attributes(attrs);
4693 }
4694
4695 SourceLocation EqualLoc;
4696 ExprResult AssignedVal;
4697 EnumAvailabilityDiags.emplace_back(*this);
4698
4699 EnterExpressionEvaluationContext ConstantEvaluated(
4700 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4701 if (TryConsumeToken(tok::equal, EqualLoc)) {
4702 AssignedVal = ParseConstantExpressionInExprEvalContext();
4703 if (AssignedVal.isInvalid())
4704 SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch);
4705 }
4706
4707 // Install the enumerator constant into EnumDecl.
4708 Decl *EnumConstDecl = Actions.ActOnEnumConstant(
4709 getCurScope(), EnumDecl, LastEnumConstDecl, IdentLoc, Ident, attrs,
4710 EqualLoc, AssignedVal.get());
4711 EnumAvailabilityDiags.back().done();
4712
4713 EnumConstantDecls.push_back(EnumConstDecl);
4714 LastEnumConstDecl = EnumConstDecl;
4715
4716 if (Tok.is(tok::identifier)) {
4717 // We're missing a comma between enumerators.
4718 SourceLocation Loc = getEndOfPreviousToken();
4719 Diag(Loc, diag::err_enumerator_list_missing_comma)
4720 << FixItHint::CreateInsertion(Loc, ", ");
4721 continue;
4722 }
4723
4724 // Emumerator definition must be finished, only comma or r_brace are
4725 // allowed here.
4726 SourceLocation CommaLoc;
4727 if (Tok.isNot(tok::r_brace) && !TryConsumeToken(tok::comma, CommaLoc)) {
4728 if (EqualLoc.isValid())
4729 Diag(Tok.getLocation(), diag::err_expected_either) << tok::r_brace
4730 << tok::comma;
4731 else
4732 Diag(Tok.getLocation(), diag::err_expected_end_of_enumerator);
4733 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch)) {
4734 if (TryConsumeToken(tok::comma, CommaLoc))
4735 continue;
4736 } else {
4737 break;
4738 }
4739 }
4740
4741 // If comma is followed by r_brace, emit appropriate warning.
4742 if (Tok.is(tok::r_brace) && CommaLoc.isValid()) {
4743 if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11)
4744 Diag(CommaLoc, getLangOpts().CPlusPlus ?
4745 diag::ext_enumerator_list_comma_cxx :
4746 diag::ext_enumerator_list_comma_c)
4747 << FixItHint::CreateRemoval(CommaLoc);
4748 else if (getLangOpts().CPlusPlus11)
4749 Diag(CommaLoc, diag::warn_cxx98_compat_enumerator_list_comma)
4750 << FixItHint::CreateRemoval(CommaLoc);
4751 break;
4752 }
4753 }
4754
4755 // Eat the }.
4756 T.consumeClose();
4757
4758 // If attributes exist after the identifier list, parse them.
4759 ParsedAttributes attrs(AttrFactory);
4760 MaybeParseGNUAttributes(attrs);
4761
4762 Actions.ActOnEnumBody(StartLoc, T.getRange(), EnumDecl, EnumConstantDecls,
4763 getCurScope(), attrs);
4764
4765 // Now handle enum constant availability diagnostics.
4766 assert(EnumConstantDecls.size() == EnumAvailabilityDiags.size());
4767 for (size_t i = 0, e = EnumConstantDecls.size(); i != e; ++i) {
4768 ParsingDeclRAIIObject PD(*this, ParsingDeclRAIIObject::NoParent);
4769 EnumAvailabilityDiags[i].redelay();
4770 PD.complete(EnumConstantDecls[i]);
4771 }
4772
4773 EnumScope.Exit();
4774 Actions.ActOnTagFinishDefinition(getCurScope(), EnumDecl, T.getRange());
4775
4776 // The next token must be valid after an enum definition. If not, a ';'
4777 // was probably forgotten.
4778 bool CanBeBitfield = getCurScope()->getFlags() & Scope::ClassScope;
4779 if (!isValidAfterTypeSpecifier(CanBeBitfield)) {
4780 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum");
4781 // Push this token back into the preprocessor and change our current token
4782 // to ';' so that the rest of the code recovers as though there were an
4783 // ';' after the definition.
4784 PP.EnterToken(Tok, /*IsReinject=*/true);
4785 Tok.setKind(tok::semi);
4786 }
4787 }
4788
4789 /// isKnownToBeTypeSpecifier - Return true if we know that the specified token
4790 /// is definitely a type-specifier. Return false if it isn't part of a type
4791 /// specifier or if we're not sure.
isKnownToBeTypeSpecifier(const Token & Tok) const4792 bool Parser::isKnownToBeTypeSpecifier(const Token &Tok) const {
4793 switch (Tok.getKind()) {
4794 default: return false;
4795 // type-specifiers
4796 case tok::kw_short:
4797 case tok::kw_long:
4798 case tok::kw___int64:
4799 case tok::kw___int128:
4800 case tok::kw_signed:
4801 case tok::kw_unsigned:
4802 case tok::kw__Complex:
4803 case tok::kw__Imaginary:
4804 case tok::kw_void:
4805 case tok::kw_char:
4806 case tok::kw_wchar_t:
4807 case tok::kw_char8_t:
4808 case tok::kw_char16_t:
4809 case tok::kw_char32_t:
4810 case tok::kw_int:
4811 case tok::kw__ExtInt:
4812 case tok::kw___bf16:
4813 case tok::kw_half:
4814 case tok::kw_float:
4815 case tok::kw_double:
4816 case tok::kw__Accum:
4817 case tok::kw__Fract:
4818 case tok::kw__Float16:
4819 case tok::kw___float128:
4820 case tok::kw_bool:
4821 case tok::kw__Bool:
4822 case tok::kw__Decimal32:
4823 case tok::kw__Decimal64:
4824 case tok::kw__Decimal128:
4825 case tok::kw___vector:
4826 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
4827 #include "clang/Basic/OpenCLImageTypes.def"
4828
4829 // struct-or-union-specifier (C99) or class-specifier (C++)
4830 case tok::kw_class:
4831 case tok::kw_struct:
4832 case tok::kw___interface:
4833 case tok::kw_union:
4834 // enum-specifier
4835 case tok::kw_enum:
4836
4837 // typedef-name
4838 case tok::annot_typename:
4839 return true;
4840 }
4841 }
4842
4843 /// isTypeSpecifierQualifier - Return true if the current token could be the
4844 /// start of a specifier-qualifier-list.
isTypeSpecifierQualifier()4845 bool Parser::isTypeSpecifierQualifier() {
4846 switch (Tok.getKind()) {
4847 default: return false;
4848
4849 case tok::identifier: // foo::bar
4850 if (TryAltiVecVectorToken())
4851 return true;
4852 LLVM_FALLTHROUGH;
4853 case tok::kw_typename: // typename T::type
4854 // Annotate typenames and C++ scope specifiers. If we get one, just
4855 // recurse to handle whatever we get.
4856 if (TryAnnotateTypeOrScopeToken())
4857 return true;
4858 if (Tok.is(tok::identifier))
4859 return false;
4860 return isTypeSpecifierQualifier();
4861
4862 case tok::coloncolon: // ::foo::bar
4863 if (NextToken().is(tok::kw_new) || // ::new
4864 NextToken().is(tok::kw_delete)) // ::delete
4865 return false;
4866
4867 if (TryAnnotateTypeOrScopeToken())
4868 return true;
4869 return isTypeSpecifierQualifier();
4870
4871 // GNU attributes support.
4872 case tok::kw___attribute:
4873 // GNU typeof support.
4874 case tok::kw_typeof:
4875
4876 // type-specifiers
4877 case tok::kw_short:
4878 case tok::kw_long:
4879 case tok::kw___int64:
4880 case tok::kw___int128:
4881 case tok::kw_signed:
4882 case tok::kw_unsigned:
4883 case tok::kw__Complex:
4884 case tok::kw__Imaginary:
4885 case tok::kw_void:
4886 case tok::kw_char:
4887 case tok::kw_wchar_t:
4888 case tok::kw_char8_t:
4889 case tok::kw_char16_t:
4890 case tok::kw_char32_t:
4891 case tok::kw_int:
4892 case tok::kw__ExtInt:
4893 case tok::kw_half:
4894 case tok::kw___bf16:
4895 case tok::kw_float:
4896 case tok::kw_double:
4897 case tok::kw__Accum:
4898 case tok::kw__Fract:
4899 case tok::kw__Float16:
4900 case tok::kw___float128:
4901 case tok::kw_bool:
4902 case tok::kw__Bool:
4903 case tok::kw__Decimal32:
4904 case tok::kw__Decimal64:
4905 case tok::kw__Decimal128:
4906 case tok::kw___vector:
4907 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
4908 #include "clang/Basic/OpenCLImageTypes.def"
4909
4910 // struct-or-union-specifier (C99) or class-specifier (C++)
4911 case tok::kw_class:
4912 case tok::kw_struct:
4913 case tok::kw___interface:
4914 case tok::kw_union:
4915 // enum-specifier
4916 case tok::kw_enum:
4917
4918 // type-qualifier
4919 case tok::kw_const:
4920 case tok::kw_volatile:
4921 case tok::kw_restrict:
4922 case tok::kw___cheri_output:
4923 case tok::kw__Sat:
4924
4925 // Debugger support.
4926 case tok::kw___unknown_anytype:
4927
4928 // typedef-name
4929 case tok::annot_typename:
4930 return true;
4931
4932 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
4933 case tok::less:
4934 return getLangOpts().ObjC;
4935
4936 case tok::kw___cdecl:
4937 case tok::kw___stdcall:
4938 case tok::kw___fastcall:
4939 case tok::kw___thiscall:
4940 case tok::kw___regcall:
4941 case tok::kw___vectorcall:
4942 case tok::kw___w64:
4943 case tok::kw___ptr64:
4944 case tok::kw___ptr32:
4945 case tok::kw___pascal:
4946 case tok::kw___unaligned:
4947
4948 case tok::kw__Nonnull:
4949 case tok::kw__Nullable:
4950 case tok::kw__Null_unspecified:
4951
4952 case tok::kw___kindof:
4953
4954 case tok::kw___private:
4955 case tok::kw___local:
4956 case tok::kw___global:
4957 case tok::kw___constant:
4958 case tok::kw___generic:
4959 case tok::kw___read_only:
4960 case tok::kw___read_write:
4961 case tok::kw___write_only:
4962 return true;
4963
4964 case tok::kw_private:
4965 return getLangOpts().OpenCL;
4966
4967 // C11 _Atomic
4968 case tok::kw__Atomic:
4969 return true;
4970 }
4971 }
4972
4973 /// isDeclarationSpecifier() - Return true if the current token is part of a
4974 /// declaration specifier.
4975 ///
4976 /// \param DisambiguatingWithExpression True to indicate that the purpose of
4977 /// this check is to disambiguate between an expression and a declaration.
isDeclarationSpecifier(bool DisambiguatingWithExpression)4978 bool Parser::isDeclarationSpecifier(bool DisambiguatingWithExpression) {
4979 switch (Tok.getKind()) {
4980 default: return false;
4981
4982 case tok::kw_pipe:
4983 return (getLangOpts().OpenCL && getLangOpts().OpenCLVersion >= 200) ||
4984 getLangOpts().OpenCLCPlusPlus;
4985
4986 case tok::identifier: // foo::bar
4987 // Unfortunate hack to support "Class.factoryMethod" notation.
4988 if (getLangOpts().ObjC && NextToken().is(tok::period))
4989 return false;
4990 if (TryAltiVecVectorToken())
4991 return true;
4992 LLVM_FALLTHROUGH;
4993 case tok::kw_decltype: // decltype(T())::type
4994 case tok::kw_typename: // typename T::type
4995 // Annotate typenames and C++ scope specifiers. If we get one, just
4996 // recurse to handle whatever we get.
4997 if (TryAnnotateTypeOrScopeToken())
4998 return true;
4999 if (TryAnnotateTypeConstraint())
5000 return true;
5001 if (Tok.is(tok::identifier))
5002 return false;
5003
5004 // If we're in Objective-C and we have an Objective-C class type followed
5005 // by an identifier and then either ':' or ']', in a place where an
5006 // expression is permitted, then this is probably a class message send
5007 // missing the initial '['. In this case, we won't consider this to be
5008 // the start of a declaration.
5009 if (DisambiguatingWithExpression &&
5010 isStartOfObjCClassMessageMissingOpenBracket())
5011 return false;
5012
5013 return isDeclarationSpecifier();
5014
5015 case tok::coloncolon: // ::foo::bar
5016 if (NextToken().is(tok::kw_new) || // ::new
5017 NextToken().is(tok::kw_delete)) // ::delete
5018 return false;
5019
5020 // Annotate typenames and C++ scope specifiers. If we get one, just
5021 // recurse to handle whatever we get.
5022 if (TryAnnotateTypeOrScopeToken())
5023 return true;
5024 return isDeclarationSpecifier();
5025
5026 // storage-class-specifier
5027 case tok::kw_typedef:
5028 case tok::kw_extern:
5029 case tok::kw___private_extern__:
5030 case tok::kw_static:
5031 case tok::kw_auto:
5032 case tok::kw___auto_type:
5033 case tok::kw_register:
5034 case tok::kw___thread:
5035 case tok::kw_thread_local:
5036 case tok::kw__Thread_local:
5037
5038 // Modules
5039 case tok::kw___module_private__:
5040
5041 // Debugger support
5042 case tok::kw___unknown_anytype:
5043
5044 // type-specifiers
5045 case tok::kw_short:
5046 case tok::kw_long:
5047 case tok::kw___int64:
5048 case tok::kw___int128:
5049 case tok::kw_signed:
5050 case tok::kw_unsigned:
5051 case tok::kw__Complex:
5052 case tok::kw__Imaginary:
5053 case tok::kw_void:
5054 case tok::kw_char:
5055 case tok::kw_wchar_t:
5056 case tok::kw_char8_t:
5057 case tok::kw_char16_t:
5058 case tok::kw_char32_t:
5059
5060 case tok::kw_int:
5061 case tok::kw__ExtInt:
5062 case tok::kw_half:
5063 case tok::kw___bf16:
5064 case tok::kw_float:
5065 case tok::kw_double:
5066 case tok::kw__Accum:
5067 case tok::kw__Fract:
5068 case tok::kw__Float16:
5069 case tok::kw___float128:
5070 case tok::kw_bool:
5071 case tok::kw__Bool:
5072 case tok::kw__Decimal32:
5073 case tok::kw__Decimal64:
5074 case tok::kw__Decimal128:
5075 case tok::kw___vector:
5076
5077 // struct-or-union-specifier (C99) or class-specifier (C++)
5078 case tok::kw_class:
5079 case tok::kw_struct:
5080 case tok::kw_union:
5081 case tok::kw___interface:
5082 // enum-specifier
5083 case tok::kw_enum:
5084
5085 // type-qualifier
5086 case tok::kw_const:
5087 case tok::kw_volatile:
5088 case tok::kw_restrict:
5089 case tok::kw___cheri_output:
5090 case tok::kw__Sat:
5091
5092 // function-specifier
5093 case tok::kw_inline:
5094 case tok::kw_virtual:
5095 case tok::kw_explicit:
5096 case tok::kw__Noreturn:
5097
5098 // alignment-specifier
5099 case tok::kw__Alignas:
5100
5101 // friend keyword.
5102 case tok::kw_friend:
5103
5104 // static_assert-declaration
5105 case tok::kw__Static_assert:
5106
5107 // GNU typeof support.
5108 case tok::kw_typeof:
5109
5110 // GNU attributes.
5111 case tok::kw___attribute:
5112
5113 // C++11 decltype and constexpr.
5114 case tok::annot_decltype:
5115 case tok::kw_constexpr:
5116
5117 // C++20 consteval and constinit.
5118 case tok::kw_consteval:
5119 case tok::kw_constinit:
5120
5121 // C11 _Atomic
5122 case tok::kw__Atomic:
5123 return true;
5124
5125 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
5126 case tok::less:
5127 return getLangOpts().ObjC;
5128
5129 // typedef-name
5130 case tok::annot_typename:
5131 return !DisambiguatingWithExpression ||
5132 !isStartOfObjCClassMessageMissingOpenBracket();
5133
5134 // placeholder-type-specifier
5135 case tok::annot_template_id: {
5136 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
5137 if (TemplateId->hasInvalidName())
5138 return true;
5139 // FIXME: What about type templates that have only been annotated as
5140 // annot_template_id, not as annot_typename?
5141 return isTypeConstraintAnnotation() &&
5142 (NextToken().is(tok::kw_auto) || NextToken().is(tok::kw_decltype));
5143 }
5144
5145 case tok::annot_cxxscope: {
5146 TemplateIdAnnotation *TemplateId =
5147 NextToken().is(tok::annot_template_id)
5148 ? takeTemplateIdAnnotation(NextToken())
5149 : nullptr;
5150 if (TemplateId && TemplateId->hasInvalidName())
5151 return true;
5152 // FIXME: What about type templates that have only been annotated as
5153 // annot_template_id, not as annot_typename?
5154 if (NextToken().is(tok::identifier) && TryAnnotateTypeConstraint())
5155 return true;
5156 return isTypeConstraintAnnotation() &&
5157 GetLookAheadToken(2).isOneOf(tok::kw_auto, tok::kw_decltype);
5158 }
5159
5160 case tok::kw___declspec:
5161 case tok::kw___cdecl:
5162 case tok::kw___stdcall:
5163 case tok::kw___fastcall:
5164 case tok::kw___thiscall:
5165 case tok::kw___regcall:
5166 case tok::kw___vectorcall:
5167 case tok::kw___w64:
5168 case tok::kw___sptr:
5169 case tok::kw___uptr:
5170 case tok::kw___ptr64:
5171 case tok::kw___ptr32:
5172 case tok::kw___forceinline:
5173 case tok::kw___pascal:
5174 case tok::kw___unaligned:
5175
5176 case tok::kw__Nonnull:
5177 case tok::kw__Nullable:
5178 case tok::kw__Null_unspecified:
5179
5180 case tok::kw___kindof:
5181
5182 case tok::kw___private:
5183 case tok::kw___local:
5184 case tok::kw___global:
5185 case tok::kw___constant:
5186 case tok::kw___generic:
5187 case tok::kw___read_only:
5188 case tok::kw___read_write:
5189 case tok::kw___write_only:
5190 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
5191 #include "clang/Basic/OpenCLImageTypes.def"
5192
5193 return true;
5194
5195 case tok::kw_private:
5196 return getLangOpts().OpenCL;
5197 }
5198 }
5199
isConstructorDeclarator(bool IsUnqualified,bool DeductionGuide)5200 bool Parser::isConstructorDeclarator(bool IsUnqualified, bool DeductionGuide) {
5201 TentativeParsingAction TPA(*this);
5202
5203 // Parse the C++ scope specifier.
5204 CXXScopeSpec SS;
5205 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
5206 /*ObjectHadErrors=*/false,
5207 /*EnteringContext=*/true)) {
5208 TPA.Revert();
5209 return false;
5210 }
5211
5212 // Parse the constructor name.
5213 if (Tok.is(tok::identifier)) {
5214 // We already know that we have a constructor name; just consume
5215 // the token.
5216 ConsumeToken();
5217 } else if (Tok.is(tok::annot_template_id)) {
5218 ConsumeAnnotationToken();
5219 } else {
5220 TPA.Revert();
5221 return false;
5222 }
5223
5224 // There may be attributes here, appertaining to the constructor name or type
5225 // we just stepped past.
5226 SkipCXX11Attributes();
5227
5228 // Current class name must be followed by a left parenthesis.
5229 if (Tok.isNot(tok::l_paren)) {
5230 TPA.Revert();
5231 return false;
5232 }
5233 ConsumeParen();
5234
5235 // A right parenthesis, or ellipsis followed by a right parenthesis signals
5236 // that we have a constructor.
5237 if (Tok.is(tok::r_paren) ||
5238 (Tok.is(tok::ellipsis) && NextToken().is(tok::r_paren))) {
5239 TPA.Revert();
5240 return true;
5241 }
5242
5243 // A C++11 attribute here signals that we have a constructor, and is an
5244 // attribute on the first constructor parameter.
5245 if (getLangOpts().CPlusPlus11 &&
5246 isCXX11AttributeSpecifier(/*Disambiguate*/ false,
5247 /*OuterMightBeMessageSend*/ true)) {
5248 TPA.Revert();
5249 return true;
5250 }
5251
5252 // If we need to, enter the specified scope.
5253 DeclaratorScopeObj DeclScopeObj(*this, SS);
5254 if (SS.isSet() && Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
5255 DeclScopeObj.EnterDeclaratorScope();
5256
5257 // Optionally skip Microsoft attributes.
5258 ParsedAttributes Attrs(AttrFactory);
5259 MaybeParseMicrosoftAttributes(Attrs);
5260
5261 // Check whether the next token(s) are part of a declaration
5262 // specifier, in which case we have the start of a parameter and,
5263 // therefore, we know that this is a constructor.
5264 bool IsConstructor = false;
5265 if (isDeclarationSpecifier())
5266 IsConstructor = true;
5267 else if (Tok.is(tok::identifier) ||
5268 (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::identifier))) {
5269 // We've seen "C ( X" or "C ( X::Y", but "X" / "X::Y" is not a type.
5270 // This might be a parenthesized member name, but is more likely to
5271 // be a constructor declaration with an invalid argument type. Keep
5272 // looking.
5273 if (Tok.is(tok::annot_cxxscope))
5274 ConsumeAnnotationToken();
5275 ConsumeToken();
5276
5277 // If this is not a constructor, we must be parsing a declarator,
5278 // which must have one of the following syntactic forms (see the
5279 // grammar extract at the start of ParseDirectDeclarator):
5280 switch (Tok.getKind()) {
5281 case tok::l_paren:
5282 // C(X ( int));
5283 case tok::l_square:
5284 // C(X [ 5]);
5285 // C(X [ [attribute]]);
5286 case tok::coloncolon:
5287 // C(X :: Y);
5288 // C(X :: *p);
5289 // Assume this isn't a constructor, rather than assuming it's a
5290 // constructor with an unnamed parameter of an ill-formed type.
5291 break;
5292
5293 case tok::r_paren:
5294 // C(X )
5295
5296 // Skip past the right-paren and any following attributes to get to
5297 // the function body or trailing-return-type.
5298 ConsumeParen();
5299 SkipCXX11Attributes();
5300
5301 if (DeductionGuide) {
5302 // C(X) -> ... is a deduction guide.
5303 IsConstructor = Tok.is(tok::arrow);
5304 break;
5305 }
5306 if (Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
5307 // Assume these were meant to be constructors:
5308 // C(X) : (the name of a bit-field cannot be parenthesized).
5309 // C(X) try (this is otherwise ill-formed).
5310 IsConstructor = true;
5311 }
5312 if (Tok.is(tok::semi) || Tok.is(tok::l_brace)) {
5313 // If we have a constructor name within the class definition,
5314 // assume these were meant to be constructors:
5315 // C(X) {
5316 // C(X) ;
5317 // ... because otherwise we would be declaring a non-static data
5318 // member that is ill-formed because it's of the same type as its
5319 // surrounding class.
5320 //
5321 // FIXME: We can actually do this whether or not the name is qualified,
5322 // because if it is qualified in this context it must be being used as
5323 // a constructor name.
5324 // currently, so we're somewhat conservative here.
5325 IsConstructor = IsUnqualified;
5326 }
5327 break;
5328
5329 default:
5330 IsConstructor = true;
5331 break;
5332 }
5333 }
5334
5335 TPA.Revert();
5336 return IsConstructor;
5337 }
5338
5339 /// ParseTypeQualifierListOpt
5340 /// type-qualifier-list: [C99 6.7.5]
5341 /// type-qualifier
5342 /// [vendor] attributes
5343 /// [ only if AttrReqs & AR_VendorAttributesParsed ]
5344 /// type-qualifier-list type-qualifier
5345 /// [vendor] type-qualifier-list attributes
5346 /// [ only if AttrReqs & AR_VendorAttributesParsed ]
5347 /// [C++0x] attribute-specifier[opt] is allowed before cv-qualifier-seq
5348 /// [ only if AttReqs & AR_CXX11AttributesParsed ]
5349 /// Note: vendor can be GNU, MS, etc and can be explicitly controlled via
5350 /// AttrRequirements bitmask values.
ParseTypeQualifierListOpt(DeclSpec & DS,unsigned AttrReqs,bool AtomicAllowed,bool IdentifierRequired,Optional<llvm::function_ref<void ()>> CodeCompletionHandler)5351 void Parser::ParseTypeQualifierListOpt(
5352 DeclSpec &DS, unsigned AttrReqs, bool AtomicAllowed,
5353 bool IdentifierRequired,
5354 Optional<llvm::function_ref<void()>> CodeCompletionHandler) {
5355 if (standardAttributesAllowed() && (AttrReqs & AR_CXX11AttributesParsed) &&
5356 isCXX11AttributeSpecifier()) {
5357 ParsedAttributesWithRange attrs(AttrFactory);
5358 ParseCXX11Attributes(attrs);
5359 DS.takeAttributesFrom(attrs);
5360 }
5361
5362 SourceLocation EndLoc;
5363
5364 while (1) {
5365 bool isInvalid = false;
5366 const char *PrevSpec = nullptr;
5367 unsigned DiagID = 0;
5368 SourceLocation Loc = Tok.getLocation();
5369
5370 switch (Tok.getKind()) {
5371 case tok::code_completion:
5372 if (CodeCompletionHandler)
5373 (*CodeCompletionHandler)();
5374 else
5375 Actions.CodeCompleteTypeQualifiers(DS);
5376 return cutOffParsing();
5377
5378 case tok::kw_const:
5379 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec, DiagID,
5380 getLangOpts());
5381 break;
5382 case tok::kw_volatile:
5383 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
5384 getLangOpts());
5385 break;
5386 case tok::kw_restrict:
5387 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
5388 getLangOpts());
5389 break;
5390 case tok::kw__Atomic:
5391 if (!AtomicAllowed)
5392 goto DoneWithTypeQuals;
5393 if (!getLangOpts().C11)
5394 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
5395 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
5396 getLangOpts());
5397 break;
5398 case tok::kw___cheri_input:
5399 isInvalid = DS.SetInput(PrevSpec, DiagID);
5400 break;
5401 case tok::kw___cheri_output:
5402 isInvalid = DS.SetOutput(PrevSpec, DiagID);
5403 break;
5404
5405 // OpenCL qualifiers:
5406 case tok::kw_private:
5407 if (!getLangOpts().OpenCL)
5408 goto DoneWithTypeQuals;
5409 LLVM_FALLTHROUGH;
5410 case tok::kw___private:
5411 case tok::kw___global:
5412 case tok::kw___local:
5413 case tok::kw___constant:
5414 case tok::kw___generic:
5415 case tok::kw___read_only:
5416 case tok::kw___write_only:
5417 case tok::kw___read_write:
5418 ParseOpenCLQualifiers(DS.getAttributes());
5419 break;
5420
5421 case tok::kw___unaligned:
5422 isInvalid = DS.SetTypeQual(DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
5423 getLangOpts());
5424 break;
5425 case tok::kw___uptr:
5426 // GNU libc headers in C mode use '__uptr' as an identifier which conflicts
5427 // with the MS modifier keyword.
5428 if ((AttrReqs & AR_DeclspecAttributesParsed) && !getLangOpts().CPlusPlus &&
5429 IdentifierRequired && DS.isEmpty() && NextToken().is(tok::semi)) {
5430 if (TryKeywordIdentFallback(false))
5431 continue;
5432 }
5433 LLVM_FALLTHROUGH;
5434 case tok::kw___sptr:
5435 case tok::kw___w64:
5436 case tok::kw___ptr64:
5437 case tok::kw___ptr32:
5438 case tok::kw___cdecl:
5439 case tok::kw___stdcall:
5440 case tok::kw___fastcall:
5441 case tok::kw___thiscall:
5442 case tok::kw___regcall:
5443 case tok::kw___vectorcall:
5444 if (AttrReqs & AR_DeclspecAttributesParsed) {
5445 ParseMicrosoftTypeAttributes(DS.getAttributes());
5446 continue;
5447 }
5448 goto DoneWithTypeQuals;
5449 case tok::kw___pascal:
5450 if (AttrReqs & AR_VendorAttributesParsed) {
5451 ParseBorlandTypeAttributes(DS.getAttributes());
5452 continue;
5453 }
5454 goto DoneWithTypeQuals;
5455
5456 // Nullability type specifiers.
5457 case tok::kw__Nonnull:
5458 case tok::kw__Nullable:
5459 case tok::kw__Null_unspecified:
5460 ParseNullabilityTypeSpecifiers(DS.getAttributes());
5461 continue;
5462
5463 // Objective-C 'kindof' types.
5464 case tok::kw___kindof:
5465 DS.getAttributes().addNew(Tok.getIdentifierInfo(), Loc, nullptr, Loc,
5466 nullptr, 0, ParsedAttr::AS_Keyword);
5467 (void)ConsumeToken();
5468 continue;
5469
5470 case tok::kw___attribute:
5471 if (AttrReqs & AR_GNUAttributesParsedAndRejected)
5472 // When GNU attributes are expressly forbidden, diagnose their usage.
5473 Diag(Tok, diag::err_attributes_not_allowed);
5474
5475 // Parse the attributes even if they are rejected to ensure that error
5476 // recovery is graceful.
5477 if (AttrReqs & AR_GNUAttributesParsed ||
5478 AttrReqs & AR_GNUAttributesParsedAndRejected) {
5479 ParseGNUAttributes(DS.getAttributes());
5480 continue; // do *not* consume the next token!
5481 }
5482 // otherwise, FALL THROUGH!
5483 LLVM_FALLTHROUGH;
5484 default:
5485 DoneWithTypeQuals:
5486 // If this is not a type-qualifier token, we're done reading type
5487 // qualifiers. First verify that DeclSpec's are consistent.
5488 DS.Finish(Actions, Actions.getASTContext().getPrintingPolicy());
5489 if (EndLoc.isValid())
5490 DS.SetRangeEnd(EndLoc);
5491 return;
5492 }
5493
5494 // If the specifier combination wasn't legal, issue a diagnostic.
5495 if (isInvalid) {
5496 assert(PrevSpec && "Method did not return previous specifier!");
5497 Diag(Tok, DiagID) << PrevSpec;
5498 }
5499 EndLoc = ConsumeToken();
5500 }
5501 }
5502
5503 /// ParseDeclarator - Parse and verify a newly-initialized declarator.
5504 ///
ParseDeclarator(Declarator & D)5505 void Parser::ParseDeclarator(Declarator &D) {
5506 /// This implements the 'declarator' production in the C grammar, then checks
5507 /// for well-formedness and issues diagnostics.
5508 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
5509 }
5510
isPtrOperatorToken(tok::TokenKind Kind,const LangOptions & Lang,DeclaratorContext TheContext)5511 static bool isPtrOperatorToken(tok::TokenKind Kind, const LangOptions &Lang,
5512 DeclaratorContext TheContext) {
5513 if (Kind == tok::star || Kind == tok::caret)
5514 return true;
5515
5516 if (Kind == tok::kw_pipe &&
5517 ((Lang.OpenCL && Lang.OpenCLVersion >= 200) || Lang.OpenCLCPlusPlus))
5518 return true;
5519
5520 if (!Lang.CPlusPlus)
5521 return false;
5522
5523 if (Kind == tok::amp)
5524 return true;
5525
5526 // We parse rvalue refs in C++03, because otherwise the errors are scary.
5527 // But we must not parse them in conversion-type-ids and new-type-ids, since
5528 // those can be legitimately followed by a && operator.
5529 // (The same thing can in theory happen after a trailing-return-type, but
5530 // since those are a C++11 feature, there is no rejects-valid issue there.)
5531 if (Kind == tok::ampamp)
5532 return Lang.CPlusPlus11 ||
5533 (TheContext != DeclaratorContext::ConversionIdContext &&
5534 TheContext != DeclaratorContext::CXXNewContext);
5535
5536 return false;
5537 }
5538
5539 // Indicates whether the given declarator is a pipe declarator.
isPipeDeclerator(const Declarator & D)5540 static bool isPipeDeclerator(const Declarator &D) {
5541 const unsigned NumTypes = D.getNumTypeObjects();
5542
5543 for (unsigned Idx = 0; Idx != NumTypes; ++Idx)
5544 if (DeclaratorChunk::Pipe == D.getTypeObject(Idx).Kind)
5545 return true;
5546
5547 return false;
5548 }
5549
5550 /// ParseDeclaratorInternal - Parse a C or C++ declarator. The direct-declarator
5551 /// is parsed by the function passed to it. Pass null, and the direct-declarator
5552 /// isn't parsed at all, making this function effectively parse the C++
5553 /// ptr-operator production.
5554 ///
5555 /// If the grammar of this construct is extended, matching changes must also be
5556 /// made to TryParseDeclarator and MightBeDeclarator, and possibly to
5557 /// isConstructorDeclarator.
5558 ///
5559 /// declarator: [C99 6.7.5] [C++ 8p4, dcl.decl]
5560 /// [C] pointer[opt] direct-declarator
5561 /// [C++] direct-declarator
5562 /// [C++] ptr-operator declarator
5563 ///
5564 /// pointer: [C99 6.7.5]
5565 /// '*' type-qualifier-list[opt]
5566 /// '*' type-qualifier-list[opt] pointer
5567 ///
5568 /// ptr-operator:
5569 /// '*' cv-qualifier-seq[opt]
5570 /// '&'
5571 /// [C++0x] '&&'
5572 /// [GNU] '&' restrict[opt] attributes[opt]
5573 /// [GNU?] '&&' restrict[opt] attributes[opt]
5574 /// '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt]
ParseDeclaratorInternal(Declarator & D,DirectDeclParseFunction DirectDeclParser)5575 void Parser::ParseDeclaratorInternal(Declarator &D,
5576 DirectDeclParseFunction DirectDeclParser) {
5577 if (Diags.hasAllExtensionsSilenced())
5578 D.setExtension();
5579
5580 // C++ member pointers start with a '::' or a nested-name.
5581 // Member pointers get special handling, since there's no place for the
5582 // scope spec in the generic path below.
5583 if (getLangOpts().CPlusPlus &&
5584 (Tok.is(tok::coloncolon) || Tok.is(tok::kw_decltype) ||
5585 (Tok.is(tok::identifier) &&
5586 (NextToken().is(tok::coloncolon) || NextToken().is(tok::less))) ||
5587 Tok.is(tok::annot_cxxscope))) {
5588 bool EnteringContext =
5589 D.getContext() == DeclaratorContext::FileContext ||
5590 D.getContext() == DeclaratorContext::MemberContext;
5591 CXXScopeSpec SS;
5592 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
5593 /*ObjectHadErrors=*/false, EnteringContext);
5594
5595 if (SS.isNotEmpty()) {
5596 if (Tok.isNot(tok::star)) {
5597 // The scope spec really belongs to the direct-declarator.
5598 if (D.mayHaveIdentifier())
5599 D.getCXXScopeSpec() = SS;
5600 else
5601 AnnotateScopeToken(SS, true);
5602
5603 if (DirectDeclParser)
5604 (this->*DirectDeclParser)(D);
5605 return;
5606 }
5607
5608 SourceLocation StarLoc = ConsumeToken();
5609 D.SetRangeEnd(StarLoc);
5610 DeclSpec DS(AttrFactory);
5611 ParseTypeQualifierListOpt(DS);
5612 D.ExtendWithDeclSpec(DS);
5613
5614 // Recurse to parse whatever is left.
5615 ParseDeclaratorInternal(D, DirectDeclParser);
5616
5617 // Sema will have to catch (syntactically invalid) pointers into global
5618 // scope. It has to catch pointers into namespace scope anyway.
5619 D.AddTypeInfo(DeclaratorChunk::getMemberPointer(
5620 SS, DS.getTypeQualifiers(), StarLoc, DS.getEndLoc()),
5621 std::move(DS.getAttributes()),
5622 /* Don't replace range end. */ SourceLocation());
5623 return;
5624 }
5625 }
5626
5627 tok::TokenKind Kind = Tok.getKind();
5628
5629 if (D.getDeclSpec().isTypeSpecPipe() && !isPipeDeclerator(D)) {
5630 DeclSpec DS(AttrFactory);
5631 ParseTypeQualifierListOpt(DS);
5632
5633 D.AddTypeInfo(
5634 DeclaratorChunk::getPipe(DS.getTypeQualifiers(), DS.getPipeLoc()),
5635 std::move(DS.getAttributes()), SourceLocation());
5636 }
5637
5638 // Not a pointer, C++ reference, or block.
5639 if (!isPtrOperatorToken(Kind, getLangOpts(), D.getContext())) {
5640 if (DirectDeclParser)
5641 (this->*DirectDeclParser)(D);
5642 return;
5643 }
5644
5645 // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference,
5646 // '&&' -> rvalue reference
5647 SourceLocation Loc = ConsumeToken(); // Eat the *, ^, & or &&.
5648 D.SetRangeEnd(Loc);
5649
5650 if (Kind == tok::star || Kind == tok::caret) {
5651 // Is a pointer.
5652 DeclSpec DS(AttrFactory);
5653
5654 // GNU attributes are not allowed here in a new-type-id, but Declspec and
5655 // C++11 attributes are allowed.
5656 unsigned Reqs = AR_CXX11AttributesParsed | AR_DeclspecAttributesParsed |
5657 ((D.getContext() != DeclaratorContext::CXXNewContext)
5658 ? AR_GNUAttributesParsed
5659 : AR_GNUAttributesParsedAndRejected);
5660 ParseTypeQualifierListOpt(DS, Reqs, true, !D.mayOmitIdentifier());
5661 D.ExtendWithDeclSpec(DS);
5662
5663 // Recursively parse the declarator.
5664 ParseDeclaratorInternal(D, DirectDeclParser);
5665 if (Kind == tok::star)
5666 // Remember that we parsed a pointer type, and remember the type-quals.
5667 D.AddTypeInfo(DeclaratorChunk::getPointer(
5668 DS.getTypeQualifiers(), Loc, DS.getConstSpecLoc(),
5669 DS.getVolatileSpecLoc(), DS.getRestrictSpecLoc(),
5670 DS.getAtomicSpecLoc(), DS.getUnalignedSpecLoc()),
5671 std::move(DS.getAttributes()), SourceLocation());
5672 else
5673 // Remember that we parsed a Block type, and remember the type-quals.
5674 D.AddTypeInfo(
5675 DeclaratorChunk::getBlockPointer(DS.getTypeQualifiers(), Loc),
5676 std::move(DS.getAttributes()), SourceLocation());
5677 } else {
5678 // Is a reference
5679 DeclSpec DS(AttrFactory);
5680
5681 // Complain about rvalue references in C++03, but then go on and build
5682 // the declarator.
5683 if (Kind == tok::ampamp)
5684 Diag(Loc, getLangOpts().CPlusPlus11 ?
5685 diag::warn_cxx98_compat_rvalue_reference :
5686 diag::ext_rvalue_reference);
5687
5688 // GNU-style and C++11 attributes are allowed here, as is restrict.
5689 ParseTypeQualifierListOpt(DS);
5690 D.ExtendWithDeclSpec(DS);
5691
5692 // C++ 8.3.2p1: cv-qualified references are ill-formed except when the
5693 // cv-qualifiers are introduced through the use of a typedef or of a
5694 // template type argument, in which case the cv-qualifiers are ignored.
5695 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
5696 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
5697 Diag(DS.getConstSpecLoc(),
5698 diag::err_invalid_reference_qualifier_application) << "const";
5699 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
5700 Diag(DS.getVolatileSpecLoc(),
5701 diag::err_invalid_reference_qualifier_application) << "volatile";
5702 // 'restrict' is permitted as an extension.
5703 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
5704 Diag(DS.getAtomicSpecLoc(),
5705 diag::err_invalid_reference_qualifier_application) << "_Atomic";
5706 }
5707
5708 // Recursively parse the declarator.
5709 ParseDeclaratorInternal(D, DirectDeclParser);
5710
5711 if (D.getNumTypeObjects() > 0) {
5712 // C++ [dcl.ref]p4: There shall be no references to references.
5713 DeclaratorChunk& InnerChunk = D.getTypeObject(D.getNumTypeObjects() - 1);
5714 if (InnerChunk.Kind == DeclaratorChunk::Reference) {
5715 if (const IdentifierInfo *II = D.getIdentifier())
5716 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
5717 << II;
5718 else
5719 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
5720 << "type name";
5721
5722 // Once we've complained about the reference-to-reference, we
5723 // can go ahead and build the (technically ill-formed)
5724 // declarator: reference collapsing will take care of it.
5725 }
5726 }
5727
5728 // Remember that we parsed a reference type.
5729 D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc,
5730 Kind == tok::amp),
5731 std::move(DS.getAttributes()), SourceLocation());
5732 }
5733 }
5734
5735 // When correcting from misplaced brackets before the identifier, the location
5736 // is saved inside the declarator so that other diagnostic messages can use
5737 // them. This extracts and returns that location, or returns the provided
5738 // location if a stored location does not exist.
getMissingDeclaratorIdLoc(Declarator & D,SourceLocation Loc)5739 static SourceLocation getMissingDeclaratorIdLoc(Declarator &D,
5740 SourceLocation Loc) {
5741 if (D.getName().StartLocation.isInvalid() &&
5742 D.getName().EndLocation.isValid())
5743 return D.getName().EndLocation;
5744
5745 return Loc;
5746 }
5747
5748 /// ParseDirectDeclarator
5749 /// direct-declarator: [C99 6.7.5]
5750 /// [C99] identifier
5751 /// '(' declarator ')'
5752 /// [GNU] '(' attributes declarator ')'
5753 /// [C90] direct-declarator '[' constant-expression[opt] ']'
5754 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
5755 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
5756 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
5757 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
5758 /// [C++11] direct-declarator '[' constant-expression[opt] ']'
5759 /// attribute-specifier-seq[opt]
5760 /// direct-declarator '(' parameter-type-list ')'
5761 /// direct-declarator '(' identifier-list[opt] ')'
5762 /// [GNU] direct-declarator '(' parameter-forward-declarations
5763 /// parameter-type-list[opt] ')'
5764 /// [C++] direct-declarator '(' parameter-declaration-clause ')'
5765 /// cv-qualifier-seq[opt] exception-specification[opt]
5766 /// [C++11] direct-declarator '(' parameter-declaration-clause ')'
5767 /// attribute-specifier-seq[opt] cv-qualifier-seq[opt]
5768 /// ref-qualifier[opt] exception-specification[opt]
5769 /// [C++] declarator-id
5770 /// [C++11] declarator-id attribute-specifier-seq[opt]
5771 ///
5772 /// declarator-id: [C++ 8]
5773 /// '...'[opt] id-expression
5774 /// '::'[opt] nested-name-specifier[opt] type-name
5775 ///
5776 /// id-expression: [C++ 5.1]
5777 /// unqualified-id
5778 /// qualified-id
5779 ///
5780 /// unqualified-id: [C++ 5.1]
5781 /// identifier
5782 /// operator-function-id
5783 /// conversion-function-id
5784 /// '~' class-name
5785 /// template-id
5786 ///
5787 /// C++17 adds the following, which we also handle here:
5788 ///
5789 /// simple-declaration:
5790 /// <decl-spec> '[' identifier-list ']' brace-or-equal-initializer ';'
5791 ///
5792 /// Note, any additional constructs added here may need corresponding changes
5793 /// in isConstructorDeclarator.
ParseDirectDeclarator(Declarator & D)5794 void Parser::ParseDirectDeclarator(Declarator &D) {
5795 DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec());
5796
5797 if (getLangOpts().CPlusPlus && D.mayHaveIdentifier()) {
5798 // This might be a C++17 structured binding.
5799 if (Tok.is(tok::l_square) && !D.mayOmitIdentifier() &&
5800 D.getCXXScopeSpec().isEmpty())
5801 return ParseDecompositionDeclarator(D);
5802
5803 // Don't parse FOO:BAR as if it were a typo for FOO::BAR inside a class, in
5804 // this context it is a bitfield. Also in range-based for statement colon
5805 // may delimit for-range-declaration.
5806 ColonProtectionRAIIObject X(
5807 *this, D.getContext() == DeclaratorContext::MemberContext ||
5808 (D.getContext() == DeclaratorContext::ForContext &&
5809 getLangOpts().CPlusPlus11));
5810
5811 // ParseDeclaratorInternal might already have parsed the scope.
5812 if (D.getCXXScopeSpec().isEmpty()) {
5813 bool EnteringContext =
5814 D.getContext() == DeclaratorContext::FileContext ||
5815 D.getContext() == DeclaratorContext::MemberContext;
5816 ParseOptionalCXXScopeSpecifier(
5817 D.getCXXScopeSpec(), /*ObjectType=*/nullptr,
5818 /*ObjectHadErrors=*/false, EnteringContext);
5819 }
5820
5821 if (D.getCXXScopeSpec().isValid()) {
5822 if (Actions.ShouldEnterDeclaratorScope(getCurScope(),
5823 D.getCXXScopeSpec()))
5824 // Change the declaration context for name lookup, until this function
5825 // is exited (and the declarator has been parsed).
5826 DeclScopeObj.EnterDeclaratorScope();
5827 else if (getObjCDeclContext()) {
5828 // Ensure that we don't interpret the next token as an identifier when
5829 // dealing with declarations in an Objective-C container.
5830 D.SetIdentifier(nullptr, Tok.getLocation());
5831 D.setInvalidType(true);
5832 ConsumeToken();
5833 goto PastIdentifier;
5834 }
5835 }
5836
5837 // C++0x [dcl.fct]p14:
5838 // There is a syntactic ambiguity when an ellipsis occurs at the end of a
5839 // parameter-declaration-clause without a preceding comma. In this case,
5840 // the ellipsis is parsed as part of the abstract-declarator if the type
5841 // of the parameter either names a template parameter pack that has not
5842 // been expanded or contains auto; otherwise, it is parsed as part of the
5843 // parameter-declaration-clause.
5844 if (Tok.is(tok::ellipsis) && D.getCXXScopeSpec().isEmpty() &&
5845 !((D.getContext() == DeclaratorContext::PrototypeContext ||
5846 D.getContext() == DeclaratorContext::LambdaExprParameterContext ||
5847 D.getContext() == DeclaratorContext::BlockLiteralContext) &&
5848 NextToken().is(tok::r_paren) &&
5849 !D.hasGroupingParens() &&
5850 !Actions.containsUnexpandedParameterPacks(D) &&
5851 D.getDeclSpec().getTypeSpecType() != TST_auto)) {
5852 SourceLocation EllipsisLoc = ConsumeToken();
5853 if (isPtrOperatorToken(Tok.getKind(), getLangOpts(), D.getContext())) {
5854 // The ellipsis was put in the wrong place. Recover, and explain to
5855 // the user what they should have done.
5856 ParseDeclarator(D);
5857 if (EllipsisLoc.isValid())
5858 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
5859 return;
5860 } else
5861 D.setEllipsisLoc(EllipsisLoc);
5862
5863 // The ellipsis can't be followed by a parenthesized declarator. We
5864 // check for that in ParseParenDeclarator, after we have disambiguated
5865 // the l_paren token.
5866 }
5867
5868 if (Tok.isOneOf(tok::identifier, tok::kw_operator, tok::annot_template_id,
5869 tok::tilde)) {
5870 // We found something that indicates the start of an unqualified-id.
5871 // Parse that unqualified-id.
5872 bool AllowConstructorName;
5873 bool AllowDeductionGuide;
5874 if (D.getDeclSpec().hasTypeSpecifier()) {
5875 AllowConstructorName = false;
5876 AllowDeductionGuide = false;
5877 } else if (D.getCXXScopeSpec().isSet()) {
5878 AllowConstructorName =
5879 (D.getContext() == DeclaratorContext::FileContext ||
5880 D.getContext() == DeclaratorContext::MemberContext);
5881 AllowDeductionGuide = false;
5882 } else {
5883 AllowConstructorName =
5884 (D.getContext() == DeclaratorContext::MemberContext);
5885 AllowDeductionGuide =
5886 (D.getContext() == DeclaratorContext::FileContext ||
5887 D.getContext() == DeclaratorContext::MemberContext);
5888 }
5889
5890 bool HadScope = D.getCXXScopeSpec().isValid();
5891 if (ParseUnqualifiedId(D.getCXXScopeSpec(),
5892 /*ObjectType=*/nullptr,
5893 /*ObjectHadErrors=*/false,
5894 /*EnteringContext=*/true,
5895 /*AllowDestructorName=*/true, AllowConstructorName,
5896 AllowDeductionGuide, nullptr, D.getName()) ||
5897 // Once we're past the identifier, if the scope was bad, mark the
5898 // whole declarator bad.
5899 D.getCXXScopeSpec().isInvalid()) {
5900 D.SetIdentifier(nullptr, Tok.getLocation());
5901 D.setInvalidType(true);
5902 } else {
5903 // ParseUnqualifiedId might have parsed a scope specifier during error
5904 // recovery. If it did so, enter that scope.
5905 if (!HadScope && D.getCXXScopeSpec().isValid() &&
5906 Actions.ShouldEnterDeclaratorScope(getCurScope(),
5907 D.getCXXScopeSpec()))
5908 DeclScopeObj.EnterDeclaratorScope();
5909
5910 // Parsed the unqualified-id; update range information and move along.
5911 if (D.getSourceRange().getBegin().isInvalid())
5912 D.SetRangeBegin(D.getName().getSourceRange().getBegin());
5913 D.SetRangeEnd(D.getName().getSourceRange().getEnd());
5914 }
5915 goto PastIdentifier;
5916 }
5917
5918 if (D.getCXXScopeSpec().isNotEmpty()) {
5919 // We have a scope specifier but no following unqualified-id.
5920 Diag(PP.getLocForEndOfToken(D.getCXXScopeSpec().getEndLoc()),
5921 diag::err_expected_unqualified_id)
5922 << /*C++*/1;
5923 D.SetIdentifier(nullptr, Tok.getLocation());
5924 goto PastIdentifier;
5925 }
5926 } else if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) {
5927 assert(!getLangOpts().CPlusPlus &&
5928 "There's a C++-specific check for tok::identifier above");
5929 assert(Tok.getIdentifierInfo() && "Not an identifier?");
5930 D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
5931 D.SetRangeEnd(Tok.getLocation());
5932 ConsumeToken();
5933 goto PastIdentifier;
5934 } else if (Tok.is(tok::identifier) && !D.mayHaveIdentifier()) {
5935 // We're not allowed an identifier here, but we got one. Try to figure out
5936 // if the user was trying to attach a name to the type, or whether the name
5937 // is some unrelated trailing syntax.
5938 bool DiagnoseIdentifier = false;
5939 if (D.hasGroupingParens())
5940 // An identifier within parens is unlikely to be intended to be anything
5941 // other than a name being "declared".
5942 DiagnoseIdentifier = true;
5943 else if (D.getContext() == DeclaratorContext::TemplateArgContext)
5944 // T<int N> is an accidental identifier; T<int N indicates a missing '>'.
5945 DiagnoseIdentifier =
5946 NextToken().isOneOf(tok::comma, tok::greater, tok::greatergreater);
5947 else if (D.getContext() == DeclaratorContext::AliasDeclContext ||
5948 D.getContext() == DeclaratorContext::AliasTemplateContext)
5949 // The most likely error is that the ';' was forgotten.
5950 DiagnoseIdentifier = NextToken().isOneOf(tok::comma, tok::semi);
5951 else if ((D.getContext() == DeclaratorContext::TrailingReturnContext ||
5952 D.getContext() == DeclaratorContext::TrailingReturnVarContext) &&
5953 !isCXX11VirtSpecifier(Tok))
5954 DiagnoseIdentifier = NextToken().isOneOf(
5955 tok::comma, tok::semi, tok::equal, tok::l_brace, tok::kw_try);
5956 if (DiagnoseIdentifier) {
5957 Diag(Tok.getLocation(), diag::err_unexpected_unqualified_id)
5958 << FixItHint::CreateRemoval(Tok.getLocation());
5959 D.SetIdentifier(nullptr, Tok.getLocation());
5960 ConsumeToken();
5961 goto PastIdentifier;
5962 }
5963 }
5964
5965 if (Tok.is(tok::l_paren)) {
5966 // If this might be an abstract-declarator followed by a direct-initializer,
5967 // check whether this is a valid declarator chunk. If it can't be, assume
5968 // that it's an initializer instead.
5969 if (D.mayOmitIdentifier() && D.mayBeFollowedByCXXDirectInit()) {
5970 RevertingTentativeParsingAction PA(*this);
5971 if (TryParseDeclarator(true, D.mayHaveIdentifier(), true) ==
5972 TPResult::False) {
5973 D.SetIdentifier(nullptr, Tok.getLocation());
5974 goto PastIdentifier;
5975 }
5976 }
5977
5978 // direct-declarator: '(' declarator ')'
5979 // direct-declarator: '(' attributes declarator ')'
5980 // Example: 'char (*X)' or 'int (*XX)(void)'
5981 ParseParenDeclarator(D);
5982
5983 // If the declarator was parenthesized, we entered the declarator
5984 // scope when parsing the parenthesized declarator, then exited
5985 // the scope already. Re-enter the scope, if we need to.
5986 if (D.getCXXScopeSpec().isSet()) {
5987 // If there was an error parsing parenthesized declarator, declarator
5988 // scope may have been entered before. Don't do it again.
5989 if (!D.isInvalidType() &&
5990 Actions.ShouldEnterDeclaratorScope(getCurScope(),
5991 D.getCXXScopeSpec()))
5992 // Change the declaration context for name lookup, until this function
5993 // is exited (and the declarator has been parsed).
5994 DeclScopeObj.EnterDeclaratorScope();
5995 }
5996 } else if (D.mayOmitIdentifier()) {
5997 // This could be something simple like "int" (in which case the declarator
5998 // portion is empty), if an abstract-declarator is allowed.
5999 D.SetIdentifier(nullptr, Tok.getLocation());
6000
6001 // The grammar for abstract-pack-declarator does not allow grouping parens.
6002 // FIXME: Revisit this once core issue 1488 is resolved.
6003 if (D.hasEllipsis() && D.hasGroupingParens())
6004 Diag(PP.getLocForEndOfToken(D.getEllipsisLoc()),
6005 diag::ext_abstract_pack_declarator_parens);
6006 } else {
6007 if (Tok.getKind() == tok::annot_pragma_parser_crash)
6008 LLVM_BUILTIN_TRAP;
6009 if (Tok.is(tok::l_square))
6010 return ParseMisplacedBracketDeclarator(D);
6011 if (D.getContext() == DeclaratorContext::MemberContext) {
6012 // Objective-C++: Detect C++ keywords and try to prevent further errors by
6013 // treating these keyword as valid member names.
6014 if (getLangOpts().ObjC && getLangOpts().CPlusPlus &&
6015 Tok.getIdentifierInfo() &&
6016 Tok.getIdentifierInfo()->isCPlusPlusKeyword(getLangOpts())) {
6017 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6018 diag::err_expected_member_name_or_semi_objcxx_keyword)
6019 << Tok.getIdentifierInfo()
6020 << (D.getDeclSpec().isEmpty() ? SourceRange()
6021 : D.getDeclSpec().getSourceRange());
6022 D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
6023 D.SetRangeEnd(Tok.getLocation());
6024 ConsumeToken();
6025 goto PastIdentifier;
6026 }
6027 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6028 diag::err_expected_member_name_or_semi)
6029 << (D.getDeclSpec().isEmpty() ? SourceRange()
6030 : D.getDeclSpec().getSourceRange());
6031 } else if (getLangOpts().CPlusPlus) {
6032 if (Tok.isOneOf(tok::period, tok::arrow))
6033 Diag(Tok, diag::err_invalid_operator_on_type) << Tok.is(tok::arrow);
6034 else {
6035 SourceLocation Loc = D.getCXXScopeSpec().getEndLoc();
6036 if (Tok.isAtStartOfLine() && Loc.isValid())
6037 Diag(PP.getLocForEndOfToken(Loc), diag::err_expected_unqualified_id)
6038 << getLangOpts().CPlusPlus;
6039 else
6040 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6041 diag::err_expected_unqualified_id)
6042 << getLangOpts().CPlusPlus;
6043 }
6044 } else {
6045 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6046 diag::err_expected_either)
6047 << tok::identifier << tok::l_paren;
6048 }
6049 D.SetIdentifier(nullptr, Tok.getLocation());
6050 D.setInvalidType(true);
6051 }
6052
6053 PastIdentifier:
6054 assert(D.isPastIdentifier() &&
6055 "Haven't past the location of the identifier yet?");
6056
6057 // Don't parse attributes unless we have parsed an unparenthesized name.
6058 if (D.hasName() && !D.getNumTypeObjects())
6059 MaybeParseCXX11Attributes(D);
6060
6061 while (1) {
6062 if (Tok.is(tok::l_paren)) {
6063 bool IsFunctionDeclaration = D.isFunctionDeclaratorAFunctionDeclaration();
6064 // Enter function-declaration scope, limiting any declarators to the
6065 // function prototype scope, including parameter declarators.
6066 ParseScope PrototypeScope(this,
6067 Scope::FunctionPrototypeScope|Scope::DeclScope|
6068 (IsFunctionDeclaration
6069 ? Scope::FunctionDeclarationScope : 0));
6070
6071 // The paren may be part of a C++ direct initializer, eg. "int x(1);".
6072 // In such a case, check if we actually have a function declarator; if it
6073 // is not, the declarator has been fully parsed.
6074 bool IsAmbiguous = false;
6075 if (getLangOpts().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) {
6076 // The name of the declarator, if any, is tentatively declared within
6077 // a possible direct initializer.
6078 TentativelyDeclaredIdentifiers.push_back(D.getIdentifier());
6079 bool IsFunctionDecl = isCXXFunctionDeclarator(&IsAmbiguous);
6080 TentativelyDeclaredIdentifiers.pop_back();
6081 if (!IsFunctionDecl)
6082 break;
6083 }
6084 ParsedAttributes attrs(AttrFactory);
6085 BalancedDelimiterTracker T(*this, tok::l_paren);
6086 T.consumeOpen();
6087 if (IsFunctionDeclaration)
6088 Actions.ActOnStartFunctionDeclarationDeclarator(D,
6089 TemplateParameterDepth);
6090 ParseFunctionDeclarator(D, attrs, T, IsAmbiguous);
6091 if (IsFunctionDeclaration)
6092 Actions.ActOnFinishFunctionDeclarationDeclarator(D);
6093 PrototypeScope.Exit();
6094 } else if (Tok.is(tok::l_square)) {
6095 ParseBracketDeclarator(D);
6096 } else if (Tok.is(tok::kw_requires) && D.hasGroupingParens()) {
6097 // This declarator is declaring a function, but the requires clause is
6098 // in the wrong place:
6099 // void (f() requires true);
6100 // instead of
6101 // void f() requires true;
6102 // or
6103 // void (f()) requires true;
6104 Diag(Tok, diag::err_requires_clause_inside_parens);
6105 ConsumeToken();
6106 ExprResult TrailingRequiresClause = Actions.CorrectDelayedTyposInExpr(
6107 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true));
6108 if (TrailingRequiresClause.isUsable() && D.isFunctionDeclarator() &&
6109 !D.hasTrailingRequiresClause())
6110 // We're already ill-formed if we got here but we'll accept it anyway.
6111 D.setTrailingRequiresClause(TrailingRequiresClause.get());
6112 } else {
6113 break;
6114 }
6115 }
6116 }
6117
ParseDecompositionDeclarator(Declarator & D)6118 void Parser::ParseDecompositionDeclarator(Declarator &D) {
6119 assert(Tok.is(tok::l_square));
6120
6121 // If this doesn't look like a structured binding, maybe it's a misplaced
6122 // array declarator.
6123 // FIXME: Consume the l_square first so we don't need extra lookahead for
6124 // this.
6125 if (!(NextToken().is(tok::identifier) &&
6126 GetLookAheadToken(2).isOneOf(tok::comma, tok::r_square)) &&
6127 !(NextToken().is(tok::r_square) &&
6128 GetLookAheadToken(2).isOneOf(tok::equal, tok::l_brace)))
6129 return ParseMisplacedBracketDeclarator(D);
6130
6131 BalancedDelimiterTracker T(*this, tok::l_square);
6132 T.consumeOpen();
6133
6134 SmallVector<DecompositionDeclarator::Binding, 32> Bindings;
6135 while (Tok.isNot(tok::r_square)) {
6136 if (!Bindings.empty()) {
6137 if (Tok.is(tok::comma))
6138 ConsumeToken();
6139 else {
6140 if (Tok.is(tok::identifier)) {
6141 SourceLocation EndLoc = getEndOfPreviousToken();
6142 Diag(EndLoc, diag::err_expected)
6143 << tok::comma << FixItHint::CreateInsertion(EndLoc, ",");
6144 } else {
6145 Diag(Tok, diag::err_expected_comma_or_rsquare);
6146 }
6147
6148 SkipUntil(tok::r_square, tok::comma, tok::identifier,
6149 StopAtSemi | StopBeforeMatch);
6150 if (Tok.is(tok::comma))
6151 ConsumeToken();
6152 else if (Tok.isNot(tok::identifier))
6153 break;
6154 }
6155 }
6156
6157 if (Tok.isNot(tok::identifier)) {
6158 Diag(Tok, diag::err_expected) << tok::identifier;
6159 break;
6160 }
6161
6162 Bindings.push_back({Tok.getIdentifierInfo(), Tok.getLocation()});
6163 ConsumeToken();
6164 }
6165
6166 if (Tok.isNot(tok::r_square))
6167 // We've already diagnosed a problem here.
6168 T.skipToEnd();
6169 else {
6170 // C++17 does not allow the identifier-list in a structured binding
6171 // to be empty.
6172 if (Bindings.empty())
6173 Diag(Tok.getLocation(), diag::ext_decomp_decl_empty);
6174
6175 T.consumeClose();
6176 }
6177
6178 return D.setDecompositionBindings(T.getOpenLocation(), Bindings,
6179 T.getCloseLocation());
6180 }
6181
6182 /// ParseParenDeclarator - We parsed the declarator D up to a paren. This is
6183 /// only called before the identifier, so these are most likely just grouping
6184 /// parens for precedence. If we find that these are actually function
6185 /// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator.
6186 ///
6187 /// direct-declarator:
6188 /// '(' declarator ')'
6189 /// [GNU] '(' attributes declarator ')'
6190 /// direct-declarator '(' parameter-type-list ')'
6191 /// direct-declarator '(' identifier-list[opt] ')'
6192 /// [GNU] direct-declarator '(' parameter-forward-declarations
6193 /// parameter-type-list[opt] ')'
6194 ///
ParseParenDeclarator(Declarator & D)6195 void Parser::ParseParenDeclarator(Declarator &D) {
6196 BalancedDelimiterTracker T(*this, tok::l_paren);
6197 T.consumeOpen();
6198
6199 assert(!D.isPastIdentifier() && "Should be called before passing identifier");
6200
6201 // Eat any attributes before we look at whether this is a grouping or function
6202 // declarator paren. If this is a grouping paren, the attribute applies to
6203 // the type being built up, for example:
6204 // int (__attribute__(()) *x)(long y)
6205 // If this ends up not being a grouping paren, the attribute applies to the
6206 // first argument, for example:
6207 // int (__attribute__(()) int x)
6208 // In either case, we need to eat any attributes to be able to determine what
6209 // sort of paren this is.
6210 //
6211 ParsedAttributes attrs(AttrFactory);
6212 bool RequiresArg = false;
6213 if (Tok.is(tok::kw___attribute)) {
6214 ParseGNUAttributes(attrs);
6215
6216 // We require that the argument list (if this is a non-grouping paren) be
6217 // present even if the attribute list was empty.
6218 RequiresArg = true;
6219 }
6220
6221 // Eat any Microsoft extensions.
6222 ParseMicrosoftTypeAttributes(attrs);
6223
6224 // Eat any Borland extensions.
6225 if (Tok.is(tok::kw___pascal))
6226 ParseBorlandTypeAttributes(attrs);
6227
6228 // If we haven't past the identifier yet (or where the identifier would be
6229 // stored, if this is an abstract declarator), then this is probably just
6230 // grouping parens. However, if this could be an abstract-declarator, then
6231 // this could also be the start of function arguments (consider 'void()').
6232 bool isGrouping;
6233
6234 if (!D.mayOmitIdentifier()) {
6235 // If this can't be an abstract-declarator, this *must* be a grouping
6236 // paren, because we haven't seen the identifier yet.
6237 isGrouping = true;
6238 } else if (Tok.is(tok::r_paren) || // 'int()' is a function.
6239 (getLangOpts().CPlusPlus && Tok.is(tok::ellipsis) &&
6240 NextToken().is(tok::r_paren)) || // C++ int(...)
6241 isDeclarationSpecifier() || // 'int(int)' is a function.
6242 isCXX11AttributeSpecifier()) { // 'int([[]]int)' is a function.
6243 // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
6244 // considered to be a type, not a K&R identifier-list.
6245 isGrouping = false;
6246 } else {
6247 // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
6248 isGrouping = true;
6249 }
6250
6251 // If this is a grouping paren, handle:
6252 // direct-declarator: '(' declarator ')'
6253 // direct-declarator: '(' attributes declarator ')'
6254 if (isGrouping) {
6255 SourceLocation EllipsisLoc = D.getEllipsisLoc();
6256 D.setEllipsisLoc(SourceLocation());
6257
6258 bool hadGroupingParens = D.hasGroupingParens();
6259 D.setGroupingParens(true);
6260 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
6261 // Match the ')'.
6262 T.consumeClose();
6263 D.AddTypeInfo(
6264 DeclaratorChunk::getParen(T.getOpenLocation(), T.getCloseLocation()),
6265 std::move(attrs), T.getCloseLocation());
6266
6267 D.setGroupingParens(hadGroupingParens);
6268
6269 // An ellipsis cannot be placed outside parentheses.
6270 if (EllipsisLoc.isValid())
6271 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
6272
6273 return;
6274 }
6275
6276 // Okay, if this wasn't a grouping paren, it must be the start of a function
6277 // argument list. Recognize that this declarator will never have an
6278 // identifier (and remember where it would have been), then call into
6279 // ParseFunctionDeclarator to handle of argument list.
6280 D.SetIdentifier(nullptr, Tok.getLocation());
6281
6282 // Enter function-declaration scope, limiting any declarators to the
6283 // function prototype scope, including parameter declarators.
6284 ParseScope PrototypeScope(this,
6285 Scope::FunctionPrototypeScope | Scope::DeclScope |
6286 (D.isFunctionDeclaratorAFunctionDeclaration()
6287 ? Scope::FunctionDeclarationScope : 0));
6288 ParseFunctionDeclarator(D, attrs, T, false, RequiresArg);
6289 PrototypeScope.Exit();
6290 }
6291
InitCXXThisScopeForDeclaratorIfRelevant(const Declarator & D,const DeclSpec & DS,llvm::Optional<Sema::CXXThisScopeRAII> & ThisScope)6292 void Parser::InitCXXThisScopeForDeclaratorIfRelevant(
6293 const Declarator &D, const DeclSpec &DS,
6294 llvm::Optional<Sema::CXXThisScopeRAII> &ThisScope) {
6295 // C++11 [expr.prim.general]p3:
6296 // If a declaration declares a member function or member function
6297 // template of a class X, the expression this is a prvalue of type
6298 // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
6299 // and the end of the function-definition, member-declarator, or
6300 // declarator.
6301 // FIXME: currently, "static" case isn't handled correctly.
6302 bool IsCXX11MemberFunction = getLangOpts().CPlusPlus11 &&
6303 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
6304 (D.getContext() == DeclaratorContext::MemberContext
6305 ? !D.getDeclSpec().isFriendSpecified()
6306 : D.getContext() == DeclaratorContext::FileContext &&
6307 D.getCXXScopeSpec().isValid() &&
6308 Actions.CurContext->isRecord());
6309 if (!IsCXX11MemberFunction)
6310 return;
6311
6312 Qualifiers Q = Qualifiers::fromCVRUMask(DS.getTypeQualifiers());
6313 if (D.getDeclSpec().hasConstexprSpecifier() && !getLangOpts().CPlusPlus14)
6314 Q.addConst();
6315 // FIXME: Collect C++ address spaces.
6316 // If there are multiple different address spaces, the source is invalid.
6317 // Carry on using the first addr space for the qualifiers of 'this'.
6318 // The diagnostic will be given later while creating the function
6319 // prototype for the method.
6320 if (getLangOpts().OpenCLCPlusPlus) {
6321 for (ParsedAttr &attr : DS.getAttributes()) {
6322 LangAS ASIdx = attr.asOpenCLLangAS();
6323 if (ASIdx != LangAS::Default) {
6324 Q.addAddressSpace(ASIdx);
6325 break;
6326 }
6327 }
6328 }
6329 ThisScope.emplace(Actions, dyn_cast<CXXRecordDecl>(Actions.CurContext), Q,
6330 IsCXX11MemberFunction);
6331 }
6332
6333 /// ParseFunctionDeclarator - We are after the identifier and have parsed the
6334 /// declarator D up to a paren, which indicates that we are parsing function
6335 /// arguments.
6336 ///
6337 /// If FirstArgAttrs is non-null, then the caller parsed those arguments
6338 /// immediately after the open paren - they should be considered to be the
6339 /// first argument of a parameter.
6340 ///
6341 /// If RequiresArg is true, then the first argument of the function is required
6342 /// to be present and required to not be an identifier list.
6343 ///
6344 /// For C++, after the parameter-list, it also parses the cv-qualifier-seq[opt],
6345 /// (C++11) ref-qualifier[opt], exception-specification[opt],
6346 /// (C++11) attribute-specifier-seq[opt], (C++11) trailing-return-type[opt] and
6347 /// (C++2a) the trailing requires-clause.
6348 ///
6349 /// [C++11] exception-specification:
6350 /// dynamic-exception-specification
6351 /// noexcept-specification
6352 ///
ParseFunctionDeclarator(Declarator & D,ParsedAttributes & FirstArgAttrs,BalancedDelimiterTracker & Tracker,bool IsAmbiguous,bool RequiresArg)6353 void Parser::ParseFunctionDeclarator(Declarator &D,
6354 ParsedAttributes &FirstArgAttrs,
6355 BalancedDelimiterTracker &Tracker,
6356 bool IsAmbiguous,
6357 bool RequiresArg) {
6358 assert(getCurScope()->isFunctionPrototypeScope() &&
6359 "Should call from a Function scope");
6360 // lparen is already consumed!
6361 assert(D.isPastIdentifier() && "Should not call before identifier!");
6362
6363 // This should be true when the function has typed arguments.
6364 // Otherwise, it is treated as a K&R-style function.
6365 bool HasProto = false;
6366 // Build up an array of information about the parsed arguments.
6367 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
6368 // Remember where we see an ellipsis, if any.
6369 SourceLocation EllipsisLoc;
6370
6371 DeclSpec DS(AttrFactory);
6372 bool RefQualifierIsLValueRef = true;
6373 SourceLocation RefQualifierLoc;
6374 ExceptionSpecificationType ESpecType = EST_None;
6375 SourceRange ESpecRange;
6376 SmallVector<ParsedType, 2> DynamicExceptions;
6377 SmallVector<SourceRange, 2> DynamicExceptionRanges;
6378 ExprResult NoexceptExpr;
6379 CachedTokens *ExceptionSpecTokens = nullptr;
6380 ParsedAttributesWithRange FnAttrs(AttrFactory);
6381 TypeResult TrailingReturnType;
6382
6383 /* LocalEndLoc is the end location for the local FunctionTypeLoc.
6384 EndLoc is the end location for the function declarator.
6385 They differ for trailing return types. */
6386 SourceLocation StartLoc, LocalEndLoc, EndLoc;
6387 SourceLocation LParenLoc, RParenLoc;
6388 LParenLoc = Tracker.getOpenLocation();
6389 StartLoc = LParenLoc;
6390
6391 if (isFunctionDeclaratorIdentifierList()) {
6392 if (RequiresArg)
6393 Diag(Tok, diag::err_argument_required_after_attribute);
6394
6395 ParseFunctionDeclaratorIdentifierList(D, ParamInfo);
6396
6397 Tracker.consumeClose();
6398 RParenLoc = Tracker.getCloseLocation();
6399 LocalEndLoc = RParenLoc;
6400 EndLoc = RParenLoc;
6401
6402 // If there are attributes following the identifier list, parse them and
6403 // prohibit them.
6404 MaybeParseCXX11Attributes(FnAttrs);
6405 ProhibitAttributes(FnAttrs);
6406 } else {
6407 if (Tok.isNot(tok::r_paren))
6408 ParseParameterDeclarationClause(D.getContext(), FirstArgAttrs, ParamInfo,
6409 EllipsisLoc);
6410 else if (RequiresArg)
6411 Diag(Tok, diag::err_argument_required_after_attribute);
6412
6413 HasProto = ParamInfo.size() || getLangOpts().CPlusPlus
6414 || getLangOpts().OpenCL;
6415
6416 // If we have the closing ')', eat it.
6417 Tracker.consumeClose();
6418 RParenLoc = Tracker.getCloseLocation();
6419 LocalEndLoc = RParenLoc;
6420 EndLoc = RParenLoc;
6421
6422 if (getLangOpts().CPlusPlus) {
6423 // FIXME: Accept these components in any order, and produce fixits to
6424 // correct the order if the user gets it wrong. Ideally we should deal
6425 // with the pure-specifier in the same way.
6426
6427 // Parse cv-qualifier-seq[opt].
6428 ParseTypeQualifierListOpt(DS, AR_NoAttributesParsed,
6429 /*AtomicAllowed*/ false,
6430 /*IdentifierRequired=*/false,
6431 llvm::function_ref<void()>([&]() {
6432 Actions.CodeCompleteFunctionQualifiers(DS, D);
6433 }));
6434 if (!DS.getSourceRange().getEnd().isInvalid()) {
6435 EndLoc = DS.getSourceRange().getEnd();
6436 }
6437
6438 // Parse ref-qualifier[opt].
6439 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc))
6440 EndLoc = RefQualifierLoc;
6441
6442 llvm::Optional<Sema::CXXThisScopeRAII> ThisScope;
6443 InitCXXThisScopeForDeclaratorIfRelevant(D, DS, ThisScope);
6444
6445 // Parse exception-specification[opt].
6446 bool Delayed = D.isFirstDeclarationOfMember() &&
6447 D.isFunctionDeclaratorAFunctionDeclaration();
6448 if (Delayed && Actions.isLibstdcxxEagerExceptionSpecHack(D) &&
6449 GetLookAheadToken(0).is(tok::kw_noexcept) &&
6450 GetLookAheadToken(1).is(tok::l_paren) &&
6451 GetLookAheadToken(2).is(tok::kw_noexcept) &&
6452 GetLookAheadToken(3).is(tok::l_paren) &&
6453 GetLookAheadToken(4).is(tok::identifier) &&
6454 GetLookAheadToken(4).getIdentifierInfo()->isStr("swap")) {
6455 // HACK: We've got an exception-specification
6456 // noexcept(noexcept(swap(...)))
6457 // or
6458 // noexcept(noexcept(swap(...)) && noexcept(swap(...)))
6459 // on a 'swap' member function. This is a libstdc++ bug; the lookup
6460 // for 'swap' will only find the function we're currently declaring,
6461 // whereas it expects to find a non-member swap through ADL. Turn off
6462 // delayed parsing to give it a chance to find what it expects.
6463 Delayed = false;
6464 }
6465 ESpecType = tryParseExceptionSpecification(Delayed,
6466 ESpecRange,
6467 DynamicExceptions,
6468 DynamicExceptionRanges,
6469 NoexceptExpr,
6470 ExceptionSpecTokens);
6471 if (ESpecType != EST_None)
6472 EndLoc = ESpecRange.getEnd();
6473
6474 // Parse attribute-specifier-seq[opt]. Per DR 979 and DR 1297, this goes
6475 // after the exception-specification.
6476 MaybeParseCXX11Attributes(FnAttrs);
6477
6478 // Parse trailing-return-type[opt].
6479 LocalEndLoc = EndLoc;
6480 if (getLangOpts().CPlusPlus11 && Tok.is(tok::arrow)) {
6481 Diag(Tok, diag::warn_cxx98_compat_trailing_return_type);
6482 if (D.getDeclSpec().getTypeSpecType() == TST_auto)
6483 StartLoc = D.getDeclSpec().getTypeSpecTypeLoc();
6484 LocalEndLoc = Tok.getLocation();
6485 SourceRange Range;
6486 TrailingReturnType =
6487 ParseTrailingReturnType(Range, D.mayBeFollowedByCXXDirectInit());
6488 EndLoc = Range.getEnd();
6489 }
6490 } else if (standardAttributesAllowed()) {
6491 MaybeParseCXX11Attributes(FnAttrs);
6492 }
6493 }
6494
6495 // Collect non-parameter declarations from the prototype if this is a function
6496 // declaration. They will be moved into the scope of the function. Only do
6497 // this in C and not C++, where the decls will continue to live in the
6498 // surrounding context.
6499 SmallVector<NamedDecl *, 0> DeclsInPrototype;
6500 if (getCurScope()->getFlags() & Scope::FunctionDeclarationScope &&
6501 !getLangOpts().CPlusPlus) {
6502 for (Decl *D : getCurScope()->decls()) {
6503 NamedDecl *ND = dyn_cast<NamedDecl>(D);
6504 if (!ND || isa<ParmVarDecl>(ND))
6505 continue;
6506 DeclsInPrototype.push_back(ND);
6507 }
6508 }
6509
6510 // Remember that we parsed a function type, and remember the attributes.
6511 D.AddTypeInfo(DeclaratorChunk::getFunction(
6512 HasProto, IsAmbiguous, LParenLoc, ParamInfo.data(),
6513 ParamInfo.size(), EllipsisLoc, RParenLoc,
6514 RefQualifierIsLValueRef, RefQualifierLoc,
6515 /*MutableLoc=*/SourceLocation(),
6516 ESpecType, ESpecRange, DynamicExceptions.data(),
6517 DynamicExceptionRanges.data(), DynamicExceptions.size(),
6518 NoexceptExpr.isUsable() ? NoexceptExpr.get() : nullptr,
6519 ExceptionSpecTokens, DeclsInPrototype, StartLoc,
6520 LocalEndLoc, D, TrailingReturnType, &DS),
6521 std::move(FnAttrs), EndLoc);
6522 }
6523
6524 /// ParseRefQualifier - Parses a member function ref-qualifier. Returns
6525 /// true if a ref-qualifier is found.
ParseRefQualifier(bool & RefQualifierIsLValueRef,SourceLocation & RefQualifierLoc)6526 bool Parser::ParseRefQualifier(bool &RefQualifierIsLValueRef,
6527 SourceLocation &RefQualifierLoc) {
6528 if (Tok.isOneOf(tok::amp, tok::ampamp)) {
6529 Diag(Tok, getLangOpts().CPlusPlus11 ?
6530 diag::warn_cxx98_compat_ref_qualifier :
6531 diag::ext_ref_qualifier);
6532
6533 RefQualifierIsLValueRef = Tok.is(tok::amp);
6534 RefQualifierLoc = ConsumeToken();
6535 return true;
6536 }
6537 return false;
6538 }
6539
6540 /// isFunctionDeclaratorIdentifierList - This parameter list may have an
6541 /// identifier list form for a K&R-style function: void foo(a,b,c)
6542 ///
6543 /// Note that identifier-lists are only allowed for normal declarators, not for
6544 /// abstract-declarators.
isFunctionDeclaratorIdentifierList()6545 bool Parser::isFunctionDeclaratorIdentifierList() {
6546 return !getLangOpts().CPlusPlus
6547 && Tok.is(tok::identifier)
6548 && !TryAltiVecVectorToken()
6549 // K&R identifier lists can't have typedefs as identifiers, per C99
6550 // 6.7.5.3p11.
6551 && (TryAnnotateTypeOrScopeToken() || !Tok.is(tok::annot_typename))
6552 // Identifier lists follow a really simple grammar: the identifiers can
6553 // be followed *only* by a ", identifier" or ")". However, K&R
6554 // identifier lists are really rare in the brave new modern world, and
6555 // it is very common for someone to typo a type in a non-K&R style
6556 // list. If we are presented with something like: "void foo(intptr x,
6557 // float y)", we don't want to start parsing the function declarator as
6558 // though it is a K&R style declarator just because intptr is an
6559 // invalid type.
6560 //
6561 // To handle this, we check to see if the token after the first
6562 // identifier is a "," or ")". Only then do we parse it as an
6563 // identifier list.
6564 && (!Tok.is(tok::eof) &&
6565 (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)));
6566 }
6567
6568 /// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator
6569 /// we found a K&R-style identifier list instead of a typed parameter list.
6570 ///
6571 /// After returning, ParamInfo will hold the parsed parameters.
6572 ///
6573 /// identifier-list: [C99 6.7.5]
6574 /// identifier
6575 /// identifier-list ',' identifier
6576 ///
ParseFunctionDeclaratorIdentifierList(Declarator & D,SmallVectorImpl<DeclaratorChunk::ParamInfo> & ParamInfo)6577 void Parser::ParseFunctionDeclaratorIdentifierList(
6578 Declarator &D,
6579 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo) {
6580 // If there was no identifier specified for the declarator, either we are in
6581 // an abstract-declarator, or we are in a parameter declarator which was found
6582 // to be abstract. In abstract-declarators, identifier lists are not valid:
6583 // diagnose this.
6584 if (!D.getIdentifier())
6585 Diag(Tok, diag::ext_ident_list_in_param);
6586
6587 // Maintain an efficient lookup of params we have seen so far.
6588 llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar;
6589
6590 do {
6591 // If this isn't an identifier, report the error and skip until ')'.
6592 if (Tok.isNot(tok::identifier)) {
6593 Diag(Tok, diag::err_expected) << tok::identifier;
6594 SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch);
6595 // Forget we parsed anything.
6596 ParamInfo.clear();
6597 return;
6598 }
6599
6600 IdentifierInfo *ParmII = Tok.getIdentifierInfo();
6601
6602 // Reject 'typedef int y; int test(x, y)', but continue parsing.
6603 if (Actions.getTypeName(*ParmII, Tok.getLocation(), getCurScope()))
6604 Diag(Tok, diag::err_unexpected_typedef_ident) << ParmII;
6605
6606 // Verify that the argument identifier has not already been mentioned.
6607 if (!ParamsSoFar.insert(ParmII).second) {
6608 Diag(Tok, diag::err_param_redefinition) << ParmII;
6609 } else {
6610 // Remember this identifier in ParamInfo.
6611 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
6612 Tok.getLocation(),
6613 nullptr));
6614 }
6615
6616 // Eat the identifier.
6617 ConsumeToken();
6618 // The list continues if we see a comma.
6619 } while (TryConsumeToken(tok::comma));
6620 }
6621
6622 /// ParseParameterDeclarationClause - Parse a (possibly empty) parameter-list
6623 /// after the opening parenthesis. This function will not parse a K&R-style
6624 /// identifier list.
6625 ///
6626 /// DeclContext is the context of the declarator being parsed. If FirstArgAttrs
6627 /// is non-null, then the caller parsed those attributes immediately after the
6628 /// open paren - they should be considered to be part of the first parameter.
6629 ///
6630 /// After returning, ParamInfo will hold the parsed parameters. EllipsisLoc will
6631 /// be the location of the ellipsis, if any was parsed.
6632 ///
6633 /// parameter-type-list: [C99 6.7.5]
6634 /// parameter-list
6635 /// parameter-list ',' '...'
6636 /// [C++] parameter-list '...'
6637 ///
6638 /// parameter-list: [C99 6.7.5]
6639 /// parameter-declaration
6640 /// parameter-list ',' parameter-declaration
6641 ///
6642 /// parameter-declaration: [C99 6.7.5]
6643 /// declaration-specifiers declarator
6644 /// [C++] declaration-specifiers declarator '=' assignment-expression
6645 /// [C++11] initializer-clause
6646 /// [GNU] declaration-specifiers declarator attributes
6647 /// declaration-specifiers abstract-declarator[opt]
6648 /// [C++] declaration-specifiers abstract-declarator[opt]
6649 /// '=' assignment-expression
6650 /// [GNU] declaration-specifiers abstract-declarator[opt] attributes
6651 /// [C++11] attribute-specifier-seq parameter-declaration
6652 ///
ParseParameterDeclarationClause(DeclaratorContext DeclaratorCtx,ParsedAttributes & FirstArgAttrs,SmallVectorImpl<DeclaratorChunk::ParamInfo> & ParamInfo,SourceLocation & EllipsisLoc)6653 void Parser::ParseParameterDeclarationClause(
6654 DeclaratorContext DeclaratorCtx,
6655 ParsedAttributes &FirstArgAttrs,
6656 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo,
6657 SourceLocation &EllipsisLoc) {
6658
6659 // Avoid exceeding the maximum function scope depth.
6660 // See https://bugs.llvm.org/show_bug.cgi?id=19607
6661 // Note Sema::ActOnParamDeclarator calls ParmVarDecl::setScopeInfo with
6662 // getFunctionPrototypeDepth() - 1.
6663 if (getCurScope()->getFunctionPrototypeDepth() - 1 >
6664 ParmVarDecl::getMaxFunctionScopeDepth()) {
6665 Diag(Tok.getLocation(), diag::err_function_scope_depth_exceeded)
6666 << ParmVarDecl::getMaxFunctionScopeDepth();
6667 cutOffParsing();
6668 return;
6669 }
6670
6671 do {
6672 // FIXME: Issue a diagnostic if we parsed an attribute-specifier-seq
6673 // before deciding this was a parameter-declaration-clause.
6674 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
6675 break;
6676
6677 // Parse the declaration-specifiers.
6678 // Just use the ParsingDeclaration "scope" of the declarator.
6679 DeclSpec DS(AttrFactory);
6680
6681 // Parse any C++11 attributes.
6682 MaybeParseCXX11Attributes(DS.getAttributes());
6683
6684 // Skip any Microsoft attributes before a param.
6685 MaybeParseMicrosoftAttributes(DS.getAttributes());
6686
6687 SourceLocation DSStart = Tok.getLocation();
6688
6689 // If the caller parsed attributes for the first argument, add them now.
6690 // Take them so that we only apply the attributes to the first parameter.
6691 // FIXME: If we can leave the attributes in the token stream somehow, we can
6692 // get rid of a parameter (FirstArgAttrs) and this statement. It might be
6693 // too much hassle.
6694 DS.takeAttributesFrom(FirstArgAttrs);
6695
6696 ParseDeclarationSpecifiers(DS);
6697
6698
6699 // Parse the declarator. This is "PrototypeContext" or
6700 // "LambdaExprParameterContext", because we must accept either
6701 // 'declarator' or 'abstract-declarator' here.
6702 Declarator ParmDeclarator(
6703 DS, DeclaratorCtx == DeclaratorContext::RequiresExprContext
6704 ? DeclaratorContext::RequiresExprContext
6705 : DeclaratorCtx == DeclaratorContext::LambdaExprContext
6706 ? DeclaratorContext::LambdaExprParameterContext
6707 : DeclaratorContext::PrototypeContext);
6708 ParseDeclarator(ParmDeclarator);
6709
6710 // Parse GNU attributes, if present.
6711 MaybeParseGNUAttributes(ParmDeclarator);
6712
6713 if (Tok.is(tok::kw_requires)) {
6714 // User tried to define a requires clause in a parameter declaration,
6715 // which is surely not a function declaration.
6716 // void f(int (*g)(int, int) requires true);
6717 Diag(Tok,
6718 diag::err_requires_clause_on_declarator_not_declaring_a_function);
6719 ConsumeToken();
6720 Actions.CorrectDelayedTyposInExpr(
6721 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true));
6722 }
6723
6724 // Remember this parsed parameter in ParamInfo.
6725 IdentifierInfo *ParmII = ParmDeclarator.getIdentifier();
6726
6727 // DefArgToks is used when the parsing of default arguments needs
6728 // to be delayed.
6729 std::unique_ptr<CachedTokens> DefArgToks;
6730
6731 // If no parameter was specified, verify that *something* was specified,
6732 // otherwise we have a missing type and identifier.
6733 if (DS.isEmpty() && ParmDeclarator.getIdentifier() == nullptr &&
6734 ParmDeclarator.getNumTypeObjects() == 0) {
6735 // Completely missing, emit error.
6736 Diag(DSStart, diag::err_missing_param);
6737 } else {
6738 // Otherwise, we have something. Add it and let semantic analysis try
6739 // to grok it and add the result to the ParamInfo we are building.
6740
6741 // Last chance to recover from a misplaced ellipsis in an attempted
6742 // parameter pack declaration.
6743 if (Tok.is(tok::ellipsis) &&
6744 (NextToken().isNot(tok::r_paren) ||
6745 (!ParmDeclarator.getEllipsisLoc().isValid() &&
6746 !Actions.isUnexpandedParameterPackPermitted())) &&
6747 Actions.containsUnexpandedParameterPacks(ParmDeclarator))
6748 DiagnoseMisplacedEllipsisInDeclarator(ConsumeToken(), ParmDeclarator);
6749
6750 // Now we are at the point where declarator parsing is finished.
6751 //
6752 // Try to catch keywords in place of the identifier in a declarator, and
6753 // in particular the common case where:
6754 // 1 identifier comes at the end of the declarator
6755 // 2 if the identifier is dropped, the declarator is valid but anonymous
6756 // (no identifier)
6757 // 3 declarator parsing succeeds, and then we have a trailing keyword,
6758 // which is never valid in a param list (e.g. missing a ',')
6759 // And we can't handle this in ParseDeclarator because in general keywords
6760 // may be allowed to follow the declarator. (And in some cases there'd be
6761 // better recovery like inserting punctuation). ParseDeclarator is just
6762 // treating this as an anonymous parameter, and fortunately at this point
6763 // we've already almost done that.
6764 //
6765 // We care about case 1) where the declarator type should be known, and
6766 // the identifier should be null.
6767 if (!ParmDeclarator.isInvalidType() && !ParmDeclarator.hasName()) {
6768 if (Tok.getIdentifierInfo() &&
6769 Tok.getIdentifierInfo()->isKeyword(getLangOpts())) {
6770 Diag(Tok, diag::err_keyword_as_parameter) << PP.getSpelling(Tok);
6771 // Consume the keyword.
6772 ConsumeToken();
6773 }
6774 }
6775 // Inform the actions module about the parameter declarator, so it gets
6776 // added to the current scope.
6777 Decl *Param = Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
6778 // Parse the default argument, if any. We parse the default
6779 // arguments in all dialects; the semantic analysis in
6780 // ActOnParamDefaultArgument will reject the default argument in
6781 // C.
6782 if (Tok.is(tok::equal)) {
6783 SourceLocation EqualLoc = Tok.getLocation();
6784
6785 // Parse the default argument
6786 if (DeclaratorCtx == DeclaratorContext::MemberContext) {
6787 // If we're inside a class definition, cache the tokens
6788 // corresponding to the default argument. We'll actually parse
6789 // them when we see the end of the class definition.
6790 DefArgToks.reset(new CachedTokens);
6791
6792 SourceLocation ArgStartLoc = NextToken().getLocation();
6793 if (!ConsumeAndStoreInitializer(*DefArgToks, CIK_DefaultArgument)) {
6794 DefArgToks.reset();
6795 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc);
6796 } else {
6797 Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc,
6798 ArgStartLoc);
6799 }
6800 } else {
6801 // Consume the '='.
6802 ConsumeToken();
6803
6804 // The argument isn't actually potentially evaluated unless it is
6805 // used.
6806 EnterExpressionEvaluationContext Eval(
6807 Actions,
6808 Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed,
6809 Param);
6810
6811 ExprResult DefArgResult;
6812 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
6813 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
6814 DefArgResult = ParseBraceInitializer();
6815 } else
6816 DefArgResult = ParseAssignmentExpression();
6817 DefArgResult = Actions.CorrectDelayedTyposInExpr(DefArgResult);
6818 if (DefArgResult.isInvalid()) {
6819 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc);
6820 SkipUntil(tok::comma, tok::r_paren, StopAtSemi | StopBeforeMatch);
6821 } else {
6822 // Inform the actions module about the default argument
6823 Actions.ActOnParamDefaultArgument(Param, EqualLoc,
6824 DefArgResult.get());
6825 }
6826 }
6827 }
6828
6829 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
6830 ParmDeclarator.getIdentifierLoc(),
6831 Param, std::move(DefArgToks)));
6832 }
6833
6834 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
6835 if (!getLangOpts().CPlusPlus) {
6836 // We have ellipsis without a preceding ',', which is ill-formed
6837 // in C. Complain and provide the fix.
6838 Diag(EllipsisLoc, diag::err_missing_comma_before_ellipsis)
6839 << FixItHint::CreateInsertion(EllipsisLoc, ", ");
6840 } else if (ParmDeclarator.getEllipsisLoc().isValid() ||
6841 Actions.containsUnexpandedParameterPacks(ParmDeclarator)) {
6842 // It looks like this was supposed to be a parameter pack. Warn and
6843 // point out where the ellipsis should have gone.
6844 SourceLocation ParmEllipsis = ParmDeclarator.getEllipsisLoc();
6845 Diag(EllipsisLoc, diag::warn_misplaced_ellipsis_vararg)
6846 << ParmEllipsis.isValid() << ParmEllipsis;
6847 if (ParmEllipsis.isValid()) {
6848 Diag(ParmEllipsis,
6849 diag::note_misplaced_ellipsis_vararg_existing_ellipsis);
6850 } else {
6851 Diag(ParmDeclarator.getIdentifierLoc(),
6852 diag::note_misplaced_ellipsis_vararg_add_ellipsis)
6853 << FixItHint::CreateInsertion(ParmDeclarator.getIdentifierLoc(),
6854 "...")
6855 << !ParmDeclarator.hasName();
6856 }
6857 Diag(EllipsisLoc, diag::note_misplaced_ellipsis_vararg_add_comma)
6858 << FixItHint::CreateInsertion(EllipsisLoc, ", ");
6859 }
6860
6861 // We can't have any more parameters after an ellipsis.
6862 break;
6863 }
6864
6865 // If the next token is a comma, consume it and keep reading arguments.
6866 } while (TryConsumeToken(tok::comma));
6867 }
6868
6869 /// [C90] direct-declarator '[' constant-expression[opt] ']'
6870 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
6871 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
6872 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
6873 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
6874 /// [C++11] direct-declarator '[' constant-expression[opt] ']'
6875 /// attribute-specifier-seq[opt]
ParseBracketDeclarator(Declarator & D)6876 void Parser::ParseBracketDeclarator(Declarator &D) {
6877 if (CheckProhibitedCXX11Attribute())
6878 return;
6879
6880 BalancedDelimiterTracker T(*this, tok::l_square);
6881 T.consumeOpen();
6882
6883 // C array syntax has many features, but by-far the most common is [] and [4].
6884 // This code does a fast path to handle some of the most obvious cases.
6885 if (Tok.getKind() == tok::r_square) {
6886 T.consumeClose();
6887 ParsedAttributes attrs(AttrFactory);
6888 MaybeParseCXX11Attributes(attrs);
6889
6890 // Remember that we parsed the empty array type.
6891 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, nullptr,
6892 T.getOpenLocation(),
6893 T.getCloseLocation()),
6894 std::move(attrs), T.getCloseLocation());
6895 return;
6896 } else if (Tok.getKind() == tok::numeric_constant &&
6897 GetLookAheadToken(1).is(tok::r_square)) {
6898 // [4] is very common. Parse the numeric constant expression.
6899 ExprResult ExprRes(Actions.ActOnNumericConstant(Tok, getCurScope()));
6900 ConsumeToken();
6901
6902 T.consumeClose();
6903 ParsedAttributes attrs(AttrFactory);
6904 MaybeParseCXX11Attributes(attrs);
6905
6906 // Remember that we parsed a array type, and remember its features.
6907 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, ExprRes.get(),
6908 T.getOpenLocation(),
6909 T.getCloseLocation()),
6910 std::move(attrs), T.getCloseLocation());
6911 return;
6912 } else if (Tok.getKind() == tok::code_completion) {
6913 Actions.CodeCompleteBracketDeclarator(getCurScope());
6914 return cutOffParsing();
6915 }
6916
6917 // If valid, this location is the position where we read the 'static' keyword.
6918 SourceLocation StaticLoc;
6919 TryConsumeToken(tok::kw_static, StaticLoc);
6920
6921 // If there is a type-qualifier-list, read it now.
6922 // Type qualifiers in an array subscript are a C99 feature.
6923 DeclSpec DS(AttrFactory);
6924 ParseTypeQualifierListOpt(DS, AR_CXX11AttributesParsed);
6925
6926 // If we haven't already read 'static', check to see if there is one after the
6927 // type-qualifier-list.
6928 if (!StaticLoc.isValid())
6929 TryConsumeToken(tok::kw_static, StaticLoc);
6930
6931 // Handle "direct-declarator [ type-qual-list[opt] * ]".
6932 bool isStar = false;
6933 ExprResult NumElements;
6934
6935 // Handle the case where we have '[*]' as the array size. However, a leading
6936 // star could be the start of an expression, for example 'X[*p + 4]'. Verify
6937 // the token after the star is a ']'. Since stars in arrays are
6938 // infrequent, use of lookahead is not costly here.
6939 if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) {
6940 ConsumeToken(); // Eat the '*'.
6941
6942 if (StaticLoc.isValid()) {
6943 Diag(StaticLoc, diag::err_unspecified_vla_size_with_static);
6944 StaticLoc = SourceLocation(); // Drop the static.
6945 }
6946 isStar = true;
6947 } else if (Tok.isNot(tok::r_square)) {
6948 // Note, in C89, this production uses the constant-expr production instead
6949 // of assignment-expr. The only difference is that assignment-expr allows
6950 // things like '=' and '*='. Sema rejects these in C89 mode because they
6951 // are not i-c-e's, so we don't need to distinguish between the two here.
6952
6953 // Parse the constant-expression or assignment-expression now (depending
6954 // on dialect).
6955 if (getLangOpts().CPlusPlus) {
6956 NumElements = ParseConstantExpression();
6957 } else {
6958 EnterExpressionEvaluationContext Unevaluated(
6959 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
6960 NumElements =
6961 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
6962 }
6963 } else {
6964 if (StaticLoc.isValid()) {
6965 Diag(StaticLoc, diag::err_unspecified_size_with_static);
6966 StaticLoc = SourceLocation(); // Drop the static.
6967 }
6968 }
6969
6970 // If there was an error parsing the assignment-expression, recover.
6971 if (NumElements.isInvalid()) {
6972 D.setInvalidType(true);
6973 // If the expression was invalid, skip it.
6974 SkipUntil(tok::r_square, StopAtSemi);
6975 return;
6976 }
6977
6978 T.consumeClose();
6979
6980 MaybeParseCXX11Attributes(DS.getAttributes());
6981
6982 // Remember that we parsed a array type, and remember its features.
6983 D.AddTypeInfo(
6984 DeclaratorChunk::getArray(DS.getTypeQualifiers(), StaticLoc.isValid(),
6985 isStar, NumElements.get(), T.getOpenLocation(),
6986 T.getCloseLocation()),
6987 std::move(DS.getAttributes()), T.getCloseLocation());
6988 }
6989
6990 /// Diagnose brackets before an identifier.
ParseMisplacedBracketDeclarator(Declarator & D)6991 void Parser::ParseMisplacedBracketDeclarator(Declarator &D) {
6992 assert(Tok.is(tok::l_square) && "Missing opening bracket");
6993 assert(!D.mayOmitIdentifier() && "Declarator cannot omit identifier");
6994
6995 SourceLocation StartBracketLoc = Tok.getLocation();
6996 Declarator TempDeclarator(D.getDeclSpec(), D.getContext());
6997
6998 while (Tok.is(tok::l_square)) {
6999 ParseBracketDeclarator(TempDeclarator);
7000 }
7001
7002 // Stuff the location of the start of the brackets into the Declarator.
7003 // The diagnostics from ParseDirectDeclarator will make more sense if
7004 // they use this location instead.
7005 if (Tok.is(tok::semi))
7006 D.getName().EndLocation = StartBracketLoc;
7007
7008 SourceLocation SuggestParenLoc = Tok.getLocation();
7009
7010 // Now that the brackets are removed, try parsing the declarator again.
7011 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
7012
7013 // Something went wrong parsing the brackets, in which case,
7014 // ParseBracketDeclarator has emitted an error, and we don't need to emit
7015 // one here.
7016 if (TempDeclarator.getNumTypeObjects() == 0)
7017 return;
7018
7019 // Determine if parens will need to be suggested in the diagnostic.
7020 bool NeedParens = false;
7021 if (D.getNumTypeObjects() != 0) {
7022 switch (D.getTypeObject(D.getNumTypeObjects() - 1).Kind) {
7023 case DeclaratorChunk::Pointer:
7024 case DeclaratorChunk::Reference:
7025 case DeclaratorChunk::BlockPointer:
7026 case DeclaratorChunk::MemberPointer:
7027 case DeclaratorChunk::Pipe:
7028 NeedParens = true;
7029 break;
7030 case DeclaratorChunk::Array:
7031 case DeclaratorChunk::Function:
7032 case DeclaratorChunk::Paren:
7033 break;
7034 }
7035 }
7036
7037 if (NeedParens) {
7038 // Create a DeclaratorChunk for the inserted parens.
7039 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getEndLoc());
7040 D.AddTypeInfo(DeclaratorChunk::getParen(SuggestParenLoc, EndLoc),
7041 SourceLocation());
7042 }
7043
7044 // Adding back the bracket info to the end of the Declarator.
7045 for (unsigned i = 0, e = TempDeclarator.getNumTypeObjects(); i < e; ++i) {
7046 const DeclaratorChunk &Chunk = TempDeclarator.getTypeObject(i);
7047 D.AddTypeInfo(Chunk, SourceLocation());
7048 }
7049
7050 // The missing identifier would have been diagnosed in ParseDirectDeclarator.
7051 // If parentheses are required, always suggest them.
7052 if (!D.getIdentifier() && !NeedParens)
7053 return;
7054
7055 SourceLocation EndBracketLoc = TempDeclarator.getEndLoc();
7056
7057 // Generate the move bracket error message.
7058 SourceRange BracketRange(StartBracketLoc, EndBracketLoc);
7059 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getEndLoc());
7060
7061 if (NeedParens) {
7062 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id)
7063 << getLangOpts().CPlusPlus
7064 << FixItHint::CreateInsertion(SuggestParenLoc, "(")
7065 << FixItHint::CreateInsertion(EndLoc, ")")
7066 << FixItHint::CreateInsertionFromRange(
7067 EndLoc, CharSourceRange(BracketRange, true))
7068 << FixItHint::CreateRemoval(BracketRange);
7069 } else {
7070 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id)
7071 << getLangOpts().CPlusPlus
7072 << FixItHint::CreateInsertionFromRange(
7073 EndLoc, CharSourceRange(BracketRange, true))
7074 << FixItHint::CreateRemoval(BracketRange);
7075 }
7076 }
7077
7078 /// [GNU] typeof-specifier:
7079 /// typeof ( expressions )
7080 /// typeof ( type-name )
7081 /// [GNU/C++] typeof unary-expression
7082 ///
ParseTypeofSpecifier(DeclSpec & DS)7083 void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
7084 assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier");
7085 Token OpTok = Tok;
7086 SourceLocation StartLoc = ConsumeToken();
7087
7088 const bool hasParens = Tok.is(tok::l_paren);
7089
7090 EnterExpressionEvaluationContext Unevaluated(
7091 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
7092 Sema::ReuseLambdaContextDecl);
7093
7094 bool isCastExpr;
7095 ParsedType CastTy;
7096 SourceRange CastRange;
7097 ExprResult Operand = Actions.CorrectDelayedTyposInExpr(
7098 ParseExprAfterUnaryExprOrTypeTrait(OpTok, isCastExpr, CastTy, CastRange));
7099 if (hasParens)
7100 DS.setTypeofParensRange(CastRange);
7101
7102 if (CastRange.getEnd().isInvalid())
7103 // FIXME: Not accurate, the range gets one token more than it should.
7104 DS.SetRangeEnd(Tok.getLocation());
7105 else
7106 DS.SetRangeEnd(CastRange.getEnd());
7107
7108 if (isCastExpr) {
7109 if (!CastTy) {
7110 DS.SetTypeSpecError();
7111 return;
7112 }
7113
7114 const char *PrevSpec = nullptr;
7115 unsigned DiagID;
7116 // Check for duplicate type specifiers (e.g. "int typeof(int)").
7117 if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec,
7118 DiagID, CastTy,
7119 Actions.getASTContext().getPrintingPolicy()))
7120 Diag(StartLoc, DiagID) << PrevSpec;
7121 return;
7122 }
7123
7124 // If we get here, the operand to the typeof was an expression.
7125 if (Operand.isInvalid()) {
7126 DS.SetTypeSpecError();
7127 return;
7128 }
7129
7130 // We might need to transform the operand if it is potentially evaluated.
7131 Operand = Actions.HandleExprEvaluationContextForTypeof(Operand.get());
7132 if (Operand.isInvalid()) {
7133 DS.SetTypeSpecError();
7134 return;
7135 }
7136
7137 const char *PrevSpec = nullptr;
7138 unsigned DiagID;
7139 // Check for duplicate type specifiers (e.g. "int typeof(int)").
7140 if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
7141 DiagID, Operand.get(),
7142 Actions.getASTContext().getPrintingPolicy()))
7143 Diag(StartLoc, DiagID) << PrevSpec;
7144 }
7145
7146 /// [C11] atomic-specifier:
7147 /// _Atomic ( type-name )
7148 ///
ParseAtomicSpecifier(DeclSpec & DS)7149 void Parser::ParseAtomicSpecifier(DeclSpec &DS) {
7150 assert(Tok.is(tok::kw__Atomic) && NextToken().is(tok::l_paren) &&
7151 "Not an atomic specifier");
7152
7153 SourceLocation StartLoc = ConsumeToken();
7154 BalancedDelimiterTracker T(*this, tok::l_paren);
7155 if (T.consumeOpen())
7156 return;
7157
7158 TypeResult Result = ParseTypeName();
7159 if (Result.isInvalid()) {
7160 SkipUntil(tok::r_paren, StopAtSemi);
7161 return;
7162 }
7163
7164 // Match the ')'
7165 T.consumeClose();
7166
7167 if (T.getCloseLocation().isInvalid())
7168 return;
7169
7170 DS.setTypeofParensRange(T.getRange());
7171 DS.SetRangeEnd(T.getCloseLocation());
7172
7173 const char *PrevSpec = nullptr;
7174 unsigned DiagID;
7175 if (DS.SetTypeSpecType(DeclSpec::TST_atomic, StartLoc, PrevSpec,
7176 DiagID, Result.get(),
7177 Actions.getASTContext().getPrintingPolicy()))
7178 Diag(StartLoc, DiagID) << PrevSpec;
7179 }
7180
7181 /// TryAltiVecVectorTokenOutOfLine - Out of line body that should only be called
7182 /// from TryAltiVecVectorToken.
TryAltiVecVectorTokenOutOfLine()7183 bool Parser::TryAltiVecVectorTokenOutOfLine() {
7184 Token Next = NextToken();
7185 switch (Next.getKind()) {
7186 default: return false;
7187 case tok::kw_short:
7188 case tok::kw_long:
7189 case tok::kw_signed:
7190 case tok::kw_unsigned:
7191 case tok::kw_void:
7192 case tok::kw_char:
7193 case tok::kw_int:
7194 case tok::kw_float:
7195 case tok::kw_double:
7196 case tok::kw_bool:
7197 case tok::kw___bool:
7198 case tok::kw___pixel:
7199 Tok.setKind(tok::kw___vector);
7200 return true;
7201 case tok::identifier:
7202 if (Next.getIdentifierInfo() == Ident_pixel) {
7203 Tok.setKind(tok::kw___vector);
7204 return true;
7205 }
7206 if (Next.getIdentifierInfo() == Ident_bool) {
7207 Tok.setKind(tok::kw___vector);
7208 return true;
7209 }
7210 return false;
7211 }
7212 }
7213
TryAltiVecTokenOutOfLine(DeclSpec & DS,SourceLocation Loc,const char * & PrevSpec,unsigned & DiagID,bool & isInvalid)7214 bool Parser::TryAltiVecTokenOutOfLine(DeclSpec &DS, SourceLocation Loc,
7215 const char *&PrevSpec, unsigned &DiagID,
7216 bool &isInvalid) {
7217 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
7218 if (Tok.getIdentifierInfo() == Ident_vector) {
7219 Token Next = NextToken();
7220 switch (Next.getKind()) {
7221 case tok::kw_short:
7222 case tok::kw_long:
7223 case tok::kw_signed:
7224 case tok::kw_unsigned:
7225 case tok::kw_void:
7226 case tok::kw_char:
7227 case tok::kw_int:
7228 case tok::kw_float:
7229 case tok::kw_double:
7230 case tok::kw_bool:
7231 case tok::kw___bool:
7232 case tok::kw___pixel:
7233 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy);
7234 return true;
7235 case tok::identifier:
7236 if (Next.getIdentifierInfo() == Ident_pixel) {
7237 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID,Policy);
7238 return true;
7239 }
7240 if (Next.getIdentifierInfo() == Ident_bool) {
7241 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID,Policy);
7242 return true;
7243 }
7244 break;
7245 default:
7246 break;
7247 }
7248 } else if ((Tok.getIdentifierInfo() == Ident_pixel) &&
7249 DS.isTypeAltiVecVector()) {
7250 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy);
7251 return true;
7252 } else if ((Tok.getIdentifierInfo() == Ident_bool) &&
7253 DS.isTypeAltiVecVector()) {
7254 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy);
7255 return true;
7256 }
7257 return false;
7258 }
7259