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 "clang/Sema/SemaDiagnostic.h"
27 #include "llvm/ADT/Optional.h"
28 #include "llvm/ADT/SmallSet.h"
29 #include "llvm/ADT/SmallString.h"
30 #include "llvm/ADT/StringSwitch.h"
31
32 using namespace clang;
33
34 //===----------------------------------------------------------------------===//
35 // C99 6.7: Declarations.
36 //===----------------------------------------------------------------------===//
37
38 /// ParseTypeName
39 /// type-name: [C99 6.7.6]
40 /// specifier-qualifier-list abstract-declarator[opt]
41 ///
42 /// Called type-id in C++.
ParseTypeName(SourceRange * Range,DeclaratorContext Context,AccessSpecifier AS,Decl ** OwnedType,ParsedAttributes * Attrs)43 TypeResult Parser::ParseTypeName(SourceRange *Range,
44 DeclaratorContext Context,
45 AccessSpecifier AS,
46 Decl **OwnedType,
47 ParsedAttributes *Attrs) {
48 DeclSpecContext DSC = getDeclSpecContextFromDeclaratorContext(Context);
49 if (DSC == DeclSpecContext::DSC_normal)
50 DSC = DeclSpecContext::DSC_type_specifier;
51
52 // Parse the common declaration-specifiers piece.
53 DeclSpec DS(AttrFactory);
54 if (Attrs)
55 DS.addAttributes(*Attrs);
56 ParseSpecifierQualifierList(DS, AS, DSC);
57 if (OwnedType)
58 *OwnedType = DS.isTypeSpecOwned() ? DS.getRepAsDecl() : nullptr;
59
60 // Parse the abstract-declarator, if present.
61 Declarator DeclaratorInfo(DS, Context);
62 ParseDeclarator(DeclaratorInfo);
63 if (Range)
64 *Range = DeclaratorInfo.getSourceRange();
65
66 if (DeclaratorInfo.isInvalidType())
67 return true;
68
69 return Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
70 }
71
72 /// Normalizes an attribute name by dropping prefixed and suffixed __.
normalizeAttrName(StringRef Name)73 static StringRef normalizeAttrName(StringRef Name) {
74 if (Name.size() >= 4 && Name.startswith("__") && Name.endswith("__"))
75 return Name.drop_front(2).drop_back(2);
76 return Name;
77 }
78
79 /// isAttributeLateParsed - Return true if the attribute has arguments that
80 /// require late parsing.
isAttributeLateParsed(const IdentifierInfo & II)81 static bool isAttributeLateParsed(const IdentifierInfo &II) {
82 #define CLANG_ATTR_LATE_PARSED_LIST
83 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
84 #include "clang/Parse/AttrParserStringSwitches.inc"
85 .Default(false);
86 #undef CLANG_ATTR_LATE_PARSED_LIST
87 }
88
89 /// Check if the a start and end source location expand to the same macro.
FindLocsWithCommonFileID(Preprocessor & PP,SourceLocation StartLoc,SourceLocation EndLoc)90 static bool FindLocsWithCommonFileID(Preprocessor &PP, SourceLocation StartLoc,
91 SourceLocation EndLoc) {
92 if (!StartLoc.isMacroID() || !EndLoc.isMacroID())
93 return false;
94
95 SourceManager &SM = PP.getSourceManager();
96 if (SM.getFileID(StartLoc) != SM.getFileID(EndLoc))
97 return false;
98
99 bool AttrStartIsInMacro =
100 Lexer::isAtStartOfMacroExpansion(StartLoc, SM, PP.getLangOpts());
101 bool AttrEndIsInMacro =
102 Lexer::isAtEndOfMacroExpansion(EndLoc, SM, PP.getLangOpts());
103 return AttrStartIsInMacro && AttrEndIsInMacro;
104 }
105
ParseAttributes(unsigned WhichAttrKinds,ParsedAttributesWithRange & Attrs,SourceLocation * End,LateParsedAttrList * LateAttrs)106 void Parser::ParseAttributes(unsigned WhichAttrKinds,
107 ParsedAttributesWithRange &Attrs,
108 SourceLocation *End,
109 LateParsedAttrList *LateAttrs) {
110 bool MoreToParse;
111 do {
112 // Assume there's nothing left to parse, but if any attributes are in fact
113 // parsed, loop to ensure all specified attribute combinations are parsed.
114 MoreToParse = false;
115 if (WhichAttrKinds & PAKM_CXX11)
116 MoreToParse |= MaybeParseCXX11Attributes(Attrs, End);
117 if (WhichAttrKinds & PAKM_GNU)
118 MoreToParse |= MaybeParseGNUAttributes(Attrs, End, LateAttrs);
119 if (WhichAttrKinds & PAKM_Declspec)
120 MoreToParse |= MaybeParseMicrosoftDeclSpecs(Attrs, End);
121 } while (MoreToParse);
122 }
123
124 /// ParseGNUAttributes - Parse a non-empty attributes list.
125 ///
126 /// [GNU] attributes:
127 /// attribute
128 /// attributes attribute
129 ///
130 /// [GNU] attribute:
131 /// '__attribute__' '(' '(' attribute-list ')' ')'
132 ///
133 /// [GNU] attribute-list:
134 /// attrib
135 /// attribute_list ',' attrib
136 ///
137 /// [GNU] attrib:
138 /// empty
139 /// attrib-name
140 /// attrib-name '(' identifier ')'
141 /// attrib-name '(' identifier ',' nonempty-expr-list ')'
142 /// attrib-name '(' argument-expression-list [C99 6.5.2] ')'
143 ///
144 /// [GNU] attrib-name:
145 /// identifier
146 /// typespec
147 /// typequal
148 /// storageclass
149 ///
150 /// Whether an attribute takes an 'identifier' is determined by the
151 /// attrib-name. GCC's behavior here is not worth imitating:
152 ///
153 /// * In C mode, if the attribute argument list starts with an identifier
154 /// followed by a ',' or an ')', and the identifier doesn't resolve to
155 /// a type, it is parsed as an identifier. If the attribute actually
156 /// wanted an expression, it's out of luck (but it turns out that no
157 /// attributes work that way, because C constant expressions are very
158 /// limited).
159 /// * In C++ mode, if the attribute argument list starts with an identifier,
160 /// and the attribute *wants* an identifier, it is parsed as an identifier.
161 /// At block scope, any additional tokens between the identifier and the
162 /// ',' or ')' are ignored, otherwise they produce a parse error.
163 ///
164 /// We follow the C++ model, but don't allow junk after the identifier.
ParseGNUAttributes(ParsedAttributesWithRange & Attrs,SourceLocation * EndLoc,LateParsedAttrList * LateAttrs,Declarator * D)165 void Parser::ParseGNUAttributes(ParsedAttributesWithRange &Attrs,
166 SourceLocation *EndLoc,
167 LateParsedAttrList *LateAttrs, Declarator *D) {
168 assert(Tok.is(tok::kw___attribute) && "Not a GNU attribute list!");
169
170 SourceLocation StartLoc = Tok.getLocation(), Loc;
171
172 if (!EndLoc)
173 EndLoc = &Loc;
174
175 while (Tok.is(tok::kw___attribute)) {
176 SourceLocation AttrTokLoc = ConsumeToken();
177 unsigned OldNumAttrs = Attrs.size();
178 unsigned OldNumLateAttrs = LateAttrs ? LateAttrs->size() : 0;
179
180 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after,
181 "attribute")) {
182 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
183 return;
184 }
185 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after, "(")) {
186 SkipUntil(tok::r_paren, StopAtSemi); // skip until ) or ;
187 return;
188 }
189 // Parse the attribute-list. e.g. __attribute__(( weak, alias("__f") ))
190 do {
191 // Eat preceeding commas to allow __attribute__((,,,foo))
192 while (TryConsumeToken(tok::comma))
193 ;
194
195 // Expect an identifier or declaration specifier (const, int, etc.)
196 if (Tok.isAnnotation())
197 break;
198 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
199 if (!AttrName)
200 break;
201
202 SourceLocation AttrNameLoc = ConsumeToken();
203
204 if (Tok.isNot(tok::l_paren)) {
205 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
206 ParsedAttr::AS_GNU);
207 continue;
208 }
209
210 // Handle "parameterized" attributes
211 if (!LateAttrs || !isAttributeLateParsed(*AttrName)) {
212 ParseGNUAttributeArgs(AttrName, AttrNameLoc, Attrs, EndLoc, nullptr,
213 SourceLocation(), ParsedAttr::AS_GNU, D);
214 continue;
215 }
216
217 // Handle attributes with arguments that require late parsing.
218 LateParsedAttribute *LA =
219 new LateParsedAttribute(this, *AttrName, AttrNameLoc);
220 LateAttrs->push_back(LA);
221
222 // Attributes in a class are parsed at the end of the class, along
223 // with other late-parsed declarations.
224 if (!ClassStack.empty() && !LateAttrs->parseSoon())
225 getCurrentClass().LateParsedDeclarations.push_back(LA);
226
227 // Be sure ConsumeAndStoreUntil doesn't see the start l_paren, since it
228 // recursively consumes balanced parens.
229 LA->Toks.push_back(Tok);
230 ConsumeParen();
231 // Consume everything up to and including the matching right parens.
232 ConsumeAndStoreUntil(tok::r_paren, LA->Toks, /*StopAtSemi=*/true);
233
234 Token Eof;
235 Eof.startToken();
236 Eof.setLocation(Tok.getLocation());
237 LA->Toks.push_back(Eof);
238 } while (Tok.is(tok::comma));
239
240 if (ExpectAndConsume(tok::r_paren))
241 SkipUntil(tok::r_paren, StopAtSemi);
242 SourceLocation Loc = Tok.getLocation();
243 if (ExpectAndConsume(tok::r_paren))
244 SkipUntil(tok::r_paren, StopAtSemi);
245 if (EndLoc)
246 *EndLoc = Loc;
247
248 // If this was declared in a macro, attach the macro IdentifierInfo to the
249 // parsed attribute.
250 auto &SM = PP.getSourceManager();
251 if (!SM.isWrittenInBuiltinFile(SM.getSpellingLoc(AttrTokLoc)) &&
252 FindLocsWithCommonFileID(PP, AttrTokLoc, Loc)) {
253 CharSourceRange ExpansionRange = SM.getExpansionRange(AttrTokLoc);
254 StringRef FoundName =
255 Lexer::getSourceText(ExpansionRange, SM, PP.getLangOpts());
256 IdentifierInfo *MacroII = PP.getIdentifierInfo(FoundName);
257
258 for (unsigned i = OldNumAttrs; i < Attrs.size(); ++i)
259 Attrs[i].setMacroIdentifier(MacroII, ExpansionRange.getBegin());
260
261 if (LateAttrs) {
262 for (unsigned i = OldNumLateAttrs; i < LateAttrs->size(); ++i)
263 (*LateAttrs)[i]->MacroII = MacroII;
264 }
265 }
266 }
267
268 Attrs.Range = SourceRange(StartLoc, *EndLoc);
269 }
270
271 /// Determine whether the given attribute has an identifier argument.
attributeHasIdentifierArg(const IdentifierInfo & II)272 static bool attributeHasIdentifierArg(const IdentifierInfo &II) {
273 #define CLANG_ATTR_IDENTIFIER_ARG_LIST
274 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
275 #include "clang/Parse/AttrParserStringSwitches.inc"
276 .Default(false);
277 #undef CLANG_ATTR_IDENTIFIER_ARG_LIST
278 }
279
280 /// Determine whether the given attribute has a variadic identifier argument.
attributeHasVariadicIdentifierArg(const IdentifierInfo & II)281 static bool attributeHasVariadicIdentifierArg(const IdentifierInfo &II) {
282 #define CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
283 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
284 #include "clang/Parse/AttrParserStringSwitches.inc"
285 .Default(false);
286 #undef CLANG_ATTR_VARIADIC_IDENTIFIER_ARG_LIST
287 }
288
289 /// Determine whether the given attribute treats kw_this as an identifier.
attributeTreatsKeywordThisAsIdentifier(const IdentifierInfo & II)290 static bool attributeTreatsKeywordThisAsIdentifier(const IdentifierInfo &II) {
291 #define CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
292 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
293 #include "clang/Parse/AttrParserStringSwitches.inc"
294 .Default(false);
295 #undef CLANG_ATTR_THIS_ISA_IDENTIFIER_ARG_LIST
296 }
297
298 /// Determine whether the given attribute parses a type argument.
attributeIsTypeArgAttr(const IdentifierInfo & II)299 static bool attributeIsTypeArgAttr(const IdentifierInfo &II) {
300 #define CLANG_ATTR_TYPE_ARG_LIST
301 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
302 #include "clang/Parse/AttrParserStringSwitches.inc"
303 .Default(false);
304 #undef CLANG_ATTR_TYPE_ARG_LIST
305 }
306
307 /// Determine whether the given attribute requires parsing its arguments
308 /// in an unevaluated context or not.
attributeParsedArgsUnevaluated(const IdentifierInfo & II)309 static bool attributeParsedArgsUnevaluated(const IdentifierInfo &II) {
310 #define CLANG_ATTR_ARG_CONTEXT_LIST
311 return llvm::StringSwitch<bool>(normalizeAttrName(II.getName()))
312 #include "clang/Parse/AttrParserStringSwitches.inc"
313 .Default(false);
314 #undef CLANG_ATTR_ARG_CONTEXT_LIST
315 }
316
ParseIdentifierLoc()317 IdentifierLoc *Parser::ParseIdentifierLoc() {
318 assert(Tok.is(tok::identifier) && "expected an identifier");
319 IdentifierLoc *IL = IdentifierLoc::create(Actions.Context,
320 Tok.getLocation(),
321 Tok.getIdentifierInfo());
322 ConsumeToken();
323 return IL;
324 }
325
ParseAttributeWithTypeArg(IdentifierInfo & AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)326 void Parser::ParseAttributeWithTypeArg(IdentifierInfo &AttrName,
327 SourceLocation AttrNameLoc,
328 ParsedAttributes &Attrs,
329 SourceLocation *EndLoc,
330 IdentifierInfo *ScopeName,
331 SourceLocation ScopeLoc,
332 ParsedAttr::Syntax Syntax) {
333 BalancedDelimiterTracker Parens(*this, tok::l_paren);
334 Parens.consumeOpen();
335
336 TypeResult T;
337 if (Tok.isNot(tok::r_paren))
338 T = ParseTypeName();
339
340 if (Parens.consumeClose())
341 return;
342
343 if (T.isInvalid())
344 return;
345
346 if (T.isUsable())
347 Attrs.addNewTypeAttr(&AttrName,
348 SourceRange(AttrNameLoc, Parens.getCloseLocation()),
349 ScopeName, ScopeLoc, T.get(), Syntax);
350 else
351 Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, Parens.getCloseLocation()),
352 ScopeName, ScopeLoc, nullptr, 0, Syntax);
353 }
354
ParseAttributeArgsCommon(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)355 unsigned Parser::ParseAttributeArgsCommon(
356 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
357 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
358 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
359 // Ignore the left paren location for now.
360 ConsumeParen();
361
362 bool ChangeKWThisToIdent = attributeTreatsKeywordThisAsIdentifier(*AttrName);
363 bool AttributeIsTypeArgAttr = attributeIsTypeArgAttr(*AttrName);
364
365 // Interpret "kw_this" as an identifier if the attributed requests it.
366 if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
367 Tok.setKind(tok::identifier);
368
369 ArgsVector ArgExprs;
370 if (Tok.is(tok::identifier)) {
371 // If this attribute wants an 'identifier' argument, make it so.
372 bool IsIdentifierArg = attributeHasIdentifierArg(*AttrName) ||
373 attributeHasVariadicIdentifierArg(*AttrName);
374 ParsedAttr::Kind AttrKind =
375 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
376
377 // If we don't know how to parse this attribute, but this is the only
378 // token in this argument, assume it's meant to be an identifier.
379 if (AttrKind == ParsedAttr::UnknownAttribute ||
380 AttrKind == ParsedAttr::IgnoredAttribute) {
381 const Token &Next = NextToken();
382 IsIdentifierArg = Next.isOneOf(tok::r_paren, tok::comma);
383 }
384
385 if (IsIdentifierArg)
386 ArgExprs.push_back(ParseIdentifierLoc());
387 }
388
389 ParsedType TheParsedType;
390 if (!ArgExprs.empty() ? Tok.is(tok::comma) : Tok.isNot(tok::r_paren)) {
391 // Eat the comma.
392 if (!ArgExprs.empty())
393 ConsumeToken();
394
395 // Parse the non-empty comma-separated list of expressions.
396 do {
397 // Interpret "kw_this" as an identifier if the attributed requests it.
398 if (ChangeKWThisToIdent && Tok.is(tok::kw_this))
399 Tok.setKind(tok::identifier);
400
401 ExprResult ArgExpr;
402 if (AttributeIsTypeArgAttr) {
403 TypeResult T = ParseTypeName();
404 if (T.isInvalid()) {
405 SkipUntil(tok::r_paren, StopAtSemi);
406 return 0;
407 }
408 if (T.isUsable())
409 TheParsedType = T.get();
410 break; // FIXME: Multiple type arguments are not implemented.
411 } else if (Tok.is(tok::identifier) &&
412 attributeHasVariadicIdentifierArg(*AttrName)) {
413 ArgExprs.push_back(ParseIdentifierLoc());
414 } else {
415 bool Uneval = attributeParsedArgsUnevaluated(*AttrName);
416 EnterExpressionEvaluationContext Unevaluated(
417 Actions,
418 Uneval ? Sema::ExpressionEvaluationContext::Unevaluated
419 : Sema::ExpressionEvaluationContext::ConstantEvaluated);
420
421 ExprResult ArgExpr(
422 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
423 if (ArgExpr.isInvalid()) {
424 SkipUntil(tok::r_paren, StopAtSemi);
425 return 0;
426 }
427 ArgExprs.push_back(ArgExpr.get());
428 }
429 // Eat the comma, move to the next argument
430 } while (TryConsumeToken(tok::comma));
431 }
432
433 SourceLocation RParen = Tok.getLocation();
434 if (!ExpectAndConsume(tok::r_paren)) {
435 SourceLocation AttrLoc = ScopeLoc.isValid() ? ScopeLoc : AttrNameLoc;
436
437 if (AttributeIsTypeArgAttr && !TheParsedType.get().isNull()) {
438 Attrs.addNewTypeAttr(AttrName, SourceRange(AttrNameLoc, RParen),
439 ScopeName, ScopeLoc, TheParsedType, Syntax);
440 } else {
441 Attrs.addNew(AttrName, SourceRange(AttrLoc, RParen), ScopeName, ScopeLoc,
442 ArgExprs.data(), ArgExprs.size(), Syntax);
443 }
444 }
445
446 if (EndLoc)
447 *EndLoc = RParen;
448
449 return static_cast<unsigned>(ArgExprs.size() + !TheParsedType.get().isNull());
450 }
451
452 /// Parse the arguments to a parameterized GNU attribute or
453 /// 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)454 void Parser::ParseGNUAttributeArgs(IdentifierInfo *AttrName,
455 SourceLocation AttrNameLoc,
456 ParsedAttributes &Attrs,
457 SourceLocation *EndLoc,
458 IdentifierInfo *ScopeName,
459 SourceLocation ScopeLoc,
460 ParsedAttr::Syntax Syntax,
461 Declarator *D) {
462
463 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
464
465 ParsedAttr::Kind AttrKind =
466 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
467
468 if (AttrKind == ParsedAttr::AT_Availability) {
469 ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
470 ScopeLoc, Syntax);
471 return;
472 } else if (AttrKind == ParsedAttr::AT_ExternalSourceSymbol) {
473 ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
474 ScopeName, ScopeLoc, Syntax);
475 return;
476 } else if (AttrKind == ParsedAttr::AT_ObjCBridgeRelated) {
477 ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
478 ScopeName, ScopeLoc, Syntax);
479 return;
480 } else if (AttrKind == ParsedAttr::AT_SwiftNewType) {
481 ParseSwiftNewTypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
482 ScopeLoc, Syntax);
483 return;
484 } else if (AttrKind == ParsedAttr::AT_TypeTagForDatatype) {
485 ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
486 ScopeName, ScopeLoc, Syntax);
487 return;
488 } else if (attributeIsTypeArgAttr(*AttrName)) {
489 ParseAttributeWithTypeArg(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
490 ScopeLoc, Syntax);
491 return;
492 }
493
494 // These may refer to the function arguments, but need to be parsed early to
495 // participate in determining whether it's a redeclaration.
496 llvm::Optional<ParseScope> PrototypeScope;
497 if (normalizeAttrName(AttrName->getName()) == "enable_if" &&
498 D && D->isFunctionDeclarator()) {
499 DeclaratorChunk::FunctionTypeInfo FTI = D->getFunctionTypeInfo();
500 PrototypeScope.emplace(this, Scope::FunctionPrototypeScope |
501 Scope::FunctionDeclarationScope |
502 Scope::DeclScope);
503 for (unsigned i = 0; i != FTI.NumParams; ++i) {
504 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.Params[i].Param);
505 Actions.ActOnReenterCXXMethodParameter(getCurScope(), Param);
506 }
507 }
508
509 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
510 ScopeLoc, Syntax);
511 }
512
ParseClangAttributeArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)513 unsigned Parser::ParseClangAttributeArgs(
514 IdentifierInfo *AttrName, SourceLocation AttrNameLoc,
515 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
516 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
517 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
518
519 ParsedAttr::Kind AttrKind =
520 ParsedAttr::getParsedKind(AttrName, ScopeName, Syntax);
521
522 switch (AttrKind) {
523 default:
524 return ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, EndLoc,
525 ScopeName, ScopeLoc, Syntax);
526 case ParsedAttr::AT_ExternalSourceSymbol:
527 ParseExternalSourceSymbolAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
528 ScopeName, ScopeLoc, Syntax);
529 break;
530 case ParsedAttr::AT_Availability:
531 ParseAvailabilityAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
532 ScopeLoc, Syntax);
533 break;
534 case ParsedAttr::AT_ObjCBridgeRelated:
535 ParseObjCBridgeRelatedAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
536 ScopeName, ScopeLoc, Syntax);
537 break;
538 case ParsedAttr::AT_SwiftNewType:
539 ParseSwiftNewTypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc, ScopeName,
540 ScopeLoc, Syntax);
541 break;
542 case ParsedAttr::AT_TypeTagForDatatype:
543 ParseTypeTagForDatatypeAttribute(*AttrName, AttrNameLoc, Attrs, EndLoc,
544 ScopeName, ScopeLoc, Syntax);
545 break;
546 }
547 return !Attrs.empty() ? Attrs.begin()->getNumArgs() : 0;
548 }
549
ParseMicrosoftDeclSpecArgs(IdentifierInfo * AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs)550 bool Parser::ParseMicrosoftDeclSpecArgs(IdentifierInfo *AttrName,
551 SourceLocation AttrNameLoc,
552 ParsedAttributes &Attrs) {
553 // If the attribute isn't known, we will not attempt to parse any
554 // arguments.
555 if (!hasAttribute(AttrSyntax::Declspec, nullptr, AttrName,
556 getTargetInfo(), getLangOpts())) {
557 // Eat the left paren, then skip to the ending right paren.
558 ConsumeParen();
559 SkipUntil(tok::r_paren);
560 return false;
561 }
562
563 SourceLocation OpenParenLoc = Tok.getLocation();
564
565 if (AttrName->getName() == "property") {
566 // The property declspec is more complex in that it can take one or two
567 // assignment expressions as a parameter, but the lhs of the assignment
568 // must be named get or put.
569
570 BalancedDelimiterTracker T(*this, tok::l_paren);
571 T.expectAndConsume(diag::err_expected_lparen_after,
572 AttrName->getNameStart(), tok::r_paren);
573
574 enum AccessorKind {
575 AK_Invalid = -1,
576 AK_Put = 0,
577 AK_Get = 1 // indices into AccessorNames
578 };
579 IdentifierInfo *AccessorNames[] = {nullptr, nullptr};
580 bool HasInvalidAccessor = false;
581
582 // Parse the accessor specifications.
583 while (true) {
584 // Stop if this doesn't look like an accessor spec.
585 if (!Tok.is(tok::identifier)) {
586 // If the user wrote a completely empty list, use a special diagnostic.
587 if (Tok.is(tok::r_paren) && !HasInvalidAccessor &&
588 AccessorNames[AK_Put] == nullptr &&
589 AccessorNames[AK_Get] == nullptr) {
590 Diag(AttrNameLoc, diag::err_ms_property_no_getter_or_putter);
591 break;
592 }
593
594 Diag(Tok.getLocation(), diag::err_ms_property_unknown_accessor);
595 break;
596 }
597
598 AccessorKind Kind;
599 SourceLocation KindLoc = Tok.getLocation();
600 StringRef KindStr = Tok.getIdentifierInfo()->getName();
601 if (KindStr == "get") {
602 Kind = AK_Get;
603 } else if (KindStr == "put") {
604 Kind = AK_Put;
605
606 // Recover from the common mistake of using 'set' instead of 'put'.
607 } else if (KindStr == "set") {
608 Diag(KindLoc, diag::err_ms_property_has_set_accessor)
609 << FixItHint::CreateReplacement(KindLoc, "put");
610 Kind = AK_Put;
611
612 // Handle the mistake of forgetting the accessor kind by skipping
613 // this accessor.
614 } else if (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)) {
615 Diag(KindLoc, diag::err_ms_property_missing_accessor_kind);
616 ConsumeToken();
617 HasInvalidAccessor = true;
618 goto next_property_accessor;
619
620 // Otherwise, complain about the unknown accessor kind.
621 } else {
622 Diag(KindLoc, diag::err_ms_property_unknown_accessor);
623 HasInvalidAccessor = true;
624 Kind = AK_Invalid;
625
626 // Try to keep parsing unless it doesn't look like an accessor spec.
627 if (!NextToken().is(tok::equal))
628 break;
629 }
630
631 // Consume the identifier.
632 ConsumeToken();
633
634 // Consume the '='.
635 if (!TryConsumeToken(tok::equal)) {
636 Diag(Tok.getLocation(), diag::err_ms_property_expected_equal)
637 << KindStr;
638 break;
639 }
640
641 // Expect the method name.
642 if (!Tok.is(tok::identifier)) {
643 Diag(Tok.getLocation(), diag::err_ms_property_expected_accessor_name);
644 break;
645 }
646
647 if (Kind == AK_Invalid) {
648 // Just drop invalid accessors.
649 } else if (AccessorNames[Kind] != nullptr) {
650 // Complain about the repeated accessor, ignore it, and keep parsing.
651 Diag(KindLoc, diag::err_ms_property_duplicate_accessor) << KindStr;
652 } else {
653 AccessorNames[Kind] = Tok.getIdentifierInfo();
654 }
655 ConsumeToken();
656
657 next_property_accessor:
658 // Keep processing accessors until we run out.
659 if (TryConsumeToken(tok::comma))
660 continue;
661
662 // If we run into the ')', stop without consuming it.
663 if (Tok.is(tok::r_paren))
664 break;
665
666 Diag(Tok.getLocation(), diag::err_ms_property_expected_comma_or_rparen);
667 break;
668 }
669
670 // Only add the property attribute if it was well-formed.
671 if (!HasInvalidAccessor)
672 Attrs.addNewPropertyAttr(AttrName, AttrNameLoc, nullptr, SourceLocation(),
673 AccessorNames[AK_Get], AccessorNames[AK_Put],
674 ParsedAttr::AS_Declspec);
675 T.skipToEnd();
676 return !HasInvalidAccessor;
677 }
678
679 unsigned NumArgs =
680 ParseAttributeArgsCommon(AttrName, AttrNameLoc, Attrs, nullptr, nullptr,
681 SourceLocation(), ParsedAttr::AS_Declspec);
682
683 // If this attribute's args were parsed, and it was expected to have
684 // arguments but none were provided, emit a diagnostic.
685 if (!Attrs.empty() && Attrs.begin()->getMaxArgs() && !NumArgs) {
686 Diag(OpenParenLoc, diag::err_attribute_requires_arguments) << AttrName;
687 return false;
688 }
689 return true;
690 }
691
692 /// [MS] decl-specifier:
693 /// __declspec ( extended-decl-modifier-seq )
694 ///
695 /// [MS] extended-decl-modifier-seq:
696 /// extended-decl-modifier[opt]
697 /// extended-decl-modifier extended-decl-modifier-seq
ParseMicrosoftDeclSpecs(ParsedAttributes & Attrs,SourceLocation * End)698 void Parser::ParseMicrosoftDeclSpecs(ParsedAttributes &Attrs,
699 SourceLocation *End) {
700 assert(getLangOpts().DeclSpecKeyword && "__declspec keyword is not enabled");
701 assert(Tok.is(tok::kw___declspec) && "Not a declspec!");
702
703 while (Tok.is(tok::kw___declspec)) {
704 ConsumeToken();
705 BalancedDelimiterTracker T(*this, tok::l_paren);
706 if (T.expectAndConsume(diag::err_expected_lparen_after, "__declspec",
707 tok::r_paren))
708 return;
709
710 // An empty declspec is perfectly legal and should not warn. Additionally,
711 // you can specify multiple attributes per declspec.
712 while (Tok.isNot(tok::r_paren)) {
713 // Attribute not present.
714 if (TryConsumeToken(tok::comma))
715 continue;
716
717 // We expect either a well-known identifier or a generic string. Anything
718 // else is a malformed declspec.
719 bool IsString = Tok.getKind() == tok::string_literal;
720 if (!IsString && Tok.getKind() != tok::identifier &&
721 Tok.getKind() != tok::kw_restrict) {
722 Diag(Tok, diag::err_ms_declspec_type);
723 T.skipToEnd();
724 return;
725 }
726
727 IdentifierInfo *AttrName;
728 SourceLocation AttrNameLoc;
729 if (IsString) {
730 SmallString<8> StrBuffer;
731 bool Invalid = false;
732 StringRef Str = PP.getSpelling(Tok, StrBuffer, &Invalid);
733 if (Invalid) {
734 T.skipToEnd();
735 return;
736 }
737 AttrName = PP.getIdentifierInfo(Str);
738 AttrNameLoc = ConsumeStringToken();
739 } else {
740 AttrName = Tok.getIdentifierInfo();
741 AttrNameLoc = ConsumeToken();
742 }
743
744 bool AttrHandled = false;
745
746 // Parse attribute arguments.
747 if (Tok.is(tok::l_paren))
748 AttrHandled = ParseMicrosoftDeclSpecArgs(AttrName, AttrNameLoc, Attrs);
749 else if (AttrName->getName() == "property")
750 // The property attribute must have an argument list.
751 Diag(Tok.getLocation(), diag::err_expected_lparen_after)
752 << AttrName->getName();
753
754 if (!AttrHandled)
755 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
756 ParsedAttr::AS_Declspec);
757 }
758 T.consumeClose();
759 if (End)
760 *End = T.getCloseLocation();
761 }
762 }
763
ParseMicrosoftTypeAttributes(ParsedAttributes & attrs)764 void Parser::ParseMicrosoftTypeAttributes(ParsedAttributes &attrs) {
765 // Treat these like attributes
766 while (true) {
767 switch (Tok.getKind()) {
768 case tok::kw___fastcall:
769 case tok::kw___stdcall:
770 case tok::kw___thiscall:
771 case tok::kw___regcall:
772 case tok::kw___cdecl:
773 case tok::kw___vectorcall:
774 case tok::kw___ptr64:
775 case tok::kw___w64:
776 case tok::kw___ptr32:
777 case tok::kw___sptr:
778 case tok::kw___uptr: {
779 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
780 SourceLocation AttrNameLoc = ConsumeToken();
781 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
782 ParsedAttr::AS_Keyword);
783 break;
784 }
785 default:
786 return;
787 }
788 }
789 }
790
DiagnoseAndSkipExtendedMicrosoftTypeAttributes()791 void Parser::DiagnoseAndSkipExtendedMicrosoftTypeAttributes() {
792 SourceLocation StartLoc = Tok.getLocation();
793 SourceLocation EndLoc = SkipExtendedMicrosoftTypeAttributes();
794
795 if (EndLoc.isValid()) {
796 SourceRange Range(StartLoc, EndLoc);
797 Diag(StartLoc, diag::warn_microsoft_qualifiers_ignored) << Range;
798 }
799 }
800
SkipExtendedMicrosoftTypeAttributes()801 SourceLocation Parser::SkipExtendedMicrosoftTypeAttributes() {
802 SourceLocation EndLoc;
803
804 while (true) {
805 switch (Tok.getKind()) {
806 case tok::kw_const:
807 case tok::kw_volatile:
808 case tok::kw___fastcall:
809 case tok::kw___stdcall:
810 case tok::kw___thiscall:
811 case tok::kw___cdecl:
812 case tok::kw___vectorcall:
813 case tok::kw___ptr32:
814 case tok::kw___ptr64:
815 case tok::kw___w64:
816 case tok::kw___unaligned:
817 case tok::kw___sptr:
818 case tok::kw___uptr:
819 EndLoc = ConsumeToken();
820 break;
821 default:
822 return EndLoc;
823 }
824 }
825 }
826
ParseBorlandTypeAttributes(ParsedAttributes & attrs)827 void Parser::ParseBorlandTypeAttributes(ParsedAttributes &attrs) {
828 // Treat these like attributes
829 while (Tok.is(tok::kw___pascal)) {
830 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
831 SourceLocation AttrNameLoc = ConsumeToken();
832 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
833 ParsedAttr::AS_Keyword);
834 }
835 }
836
ParseOpenCLKernelAttributes(ParsedAttributes & attrs)837 void Parser::ParseOpenCLKernelAttributes(ParsedAttributes &attrs) {
838 // Treat these like attributes
839 while (Tok.is(tok::kw___kernel)) {
840 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
841 SourceLocation AttrNameLoc = ConsumeToken();
842 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
843 ParsedAttr::AS_Keyword);
844 }
845 }
846
ParseOpenCLQualifiers(ParsedAttributes & Attrs)847 void Parser::ParseOpenCLQualifiers(ParsedAttributes &Attrs) {
848 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
849 SourceLocation AttrNameLoc = Tok.getLocation();
850 Attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
851 ParsedAttr::AS_Keyword);
852 }
853
ParseNullabilityTypeSpecifiers(ParsedAttributes & attrs)854 void Parser::ParseNullabilityTypeSpecifiers(ParsedAttributes &attrs) {
855 // Treat these like attributes, even though they're type specifiers.
856 while (true) {
857 switch (Tok.getKind()) {
858 case tok::kw__Nonnull:
859 case tok::kw__Nullable:
860 case tok::kw__Nullable_result:
861 case tok::kw__Null_unspecified: {
862 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
863 SourceLocation AttrNameLoc = ConsumeToken();
864 if (!getLangOpts().ObjC)
865 Diag(AttrNameLoc, diag::ext_nullability)
866 << AttrName;
867 attrs.addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc, nullptr, 0,
868 ParsedAttr::AS_Keyword);
869 break;
870 }
871 default:
872 return;
873 }
874 }
875 }
876
VersionNumberSeparator(const char Separator)877 static bool VersionNumberSeparator(const char Separator) {
878 return (Separator == '.' || Separator == '_');
879 }
880
881 /// Parse a version number.
882 ///
883 /// version:
884 /// simple-integer
885 /// simple-integer '.' simple-integer
886 /// simple-integer '_' simple-integer
887 /// simple-integer '.' simple-integer '.' simple-integer
888 /// simple-integer '_' simple-integer '_' simple-integer
ParseVersionTuple(SourceRange & Range)889 VersionTuple Parser::ParseVersionTuple(SourceRange &Range) {
890 Range = SourceRange(Tok.getLocation(), Tok.getEndLoc());
891
892 if (!Tok.is(tok::numeric_constant)) {
893 Diag(Tok, diag::err_expected_version);
894 SkipUntil(tok::comma, tok::r_paren,
895 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
896 return VersionTuple();
897 }
898
899 // Parse the major (and possibly minor and subminor) versions, which
900 // are stored in the numeric constant. We utilize a quirk of the
901 // lexer, which is that it handles something like 1.2.3 as a single
902 // numeric constant, rather than two separate tokens.
903 SmallString<512> Buffer;
904 Buffer.resize(Tok.getLength()+1);
905 const char *ThisTokBegin = &Buffer[0];
906
907 // Get the spelling of the token, which eliminates trigraphs, etc.
908 bool Invalid = false;
909 unsigned ActualLength = PP.getSpelling(Tok, ThisTokBegin, &Invalid);
910 if (Invalid)
911 return VersionTuple();
912
913 // Parse the major version.
914 unsigned AfterMajor = 0;
915 unsigned Major = 0;
916 while (AfterMajor < ActualLength && isDigit(ThisTokBegin[AfterMajor])) {
917 Major = Major * 10 + ThisTokBegin[AfterMajor] - '0';
918 ++AfterMajor;
919 }
920
921 if (AfterMajor == 0) {
922 Diag(Tok, diag::err_expected_version);
923 SkipUntil(tok::comma, tok::r_paren,
924 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
925 return VersionTuple();
926 }
927
928 if (AfterMajor == ActualLength) {
929 ConsumeToken();
930
931 // We only had a single version component.
932 if (Major == 0) {
933 Diag(Tok, diag::err_zero_version);
934 return VersionTuple();
935 }
936
937 return VersionTuple(Major);
938 }
939
940 const char AfterMajorSeparator = ThisTokBegin[AfterMajor];
941 if (!VersionNumberSeparator(AfterMajorSeparator)
942 || (AfterMajor + 1 == ActualLength)) {
943 Diag(Tok, diag::err_expected_version);
944 SkipUntil(tok::comma, tok::r_paren,
945 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
946 return VersionTuple();
947 }
948
949 // Parse the minor version.
950 unsigned AfterMinor = AfterMajor + 1;
951 unsigned Minor = 0;
952 while (AfterMinor < ActualLength && isDigit(ThisTokBegin[AfterMinor])) {
953 Minor = Minor * 10 + ThisTokBegin[AfterMinor] - '0';
954 ++AfterMinor;
955 }
956
957 if (AfterMinor == ActualLength) {
958 ConsumeToken();
959
960 // We had major.minor.
961 if (Major == 0 && Minor == 0) {
962 Diag(Tok, diag::err_zero_version);
963 return VersionTuple();
964 }
965
966 return VersionTuple(Major, Minor);
967 }
968
969 const char AfterMinorSeparator = ThisTokBegin[AfterMinor];
970 // If what follows is not a '.' or '_', we have a problem.
971 if (!VersionNumberSeparator(AfterMinorSeparator)) {
972 Diag(Tok, diag::err_expected_version);
973 SkipUntil(tok::comma, tok::r_paren,
974 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
975 return VersionTuple();
976 }
977
978 // Warn if separators, be it '.' or '_', do not match.
979 if (AfterMajorSeparator != AfterMinorSeparator)
980 Diag(Tok, diag::warn_expected_consistent_version_separator);
981
982 // Parse the subminor version.
983 unsigned AfterSubminor = AfterMinor + 1;
984 unsigned Subminor = 0;
985 while (AfterSubminor < ActualLength && isDigit(ThisTokBegin[AfterSubminor])) {
986 Subminor = Subminor * 10 + ThisTokBegin[AfterSubminor] - '0';
987 ++AfterSubminor;
988 }
989
990 if (AfterSubminor != ActualLength) {
991 Diag(Tok, diag::err_expected_version);
992 SkipUntil(tok::comma, tok::r_paren,
993 StopAtSemi | StopBeforeMatch | StopAtCodeCompletion);
994 return VersionTuple();
995 }
996 ConsumeToken();
997 return VersionTuple(Major, Minor, Subminor);
998 }
999
1000 /// Parse the contents of the "availability" attribute.
1001 ///
1002 /// availability-attribute:
1003 /// 'availability' '(' platform ',' opt-strict version-arg-list,
1004 /// opt-replacement, opt-message')'
1005 ///
1006 /// platform:
1007 /// identifier
1008 ///
1009 /// opt-strict:
1010 /// 'strict' ','
1011 ///
1012 /// version-arg-list:
1013 /// version-arg
1014 /// version-arg ',' version-arg-list
1015 ///
1016 /// version-arg:
1017 /// 'introduced' '=' version
1018 /// 'deprecated' '=' version
1019 /// 'obsoleted' = version
1020 /// 'unavailable'
1021 /// opt-replacement:
1022 /// 'replacement' '=' <string>
1023 /// opt-message:
1024 /// 'message' '=' <string>
ParseAvailabilityAttribute(IdentifierInfo & Availability,SourceLocation AvailabilityLoc,ParsedAttributes & attrs,SourceLocation * endLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1025 void Parser::ParseAvailabilityAttribute(IdentifierInfo &Availability,
1026 SourceLocation AvailabilityLoc,
1027 ParsedAttributes &attrs,
1028 SourceLocation *endLoc,
1029 IdentifierInfo *ScopeName,
1030 SourceLocation ScopeLoc,
1031 ParsedAttr::Syntax Syntax) {
1032 enum { Introduced, Deprecated, Obsoleted, Unknown };
1033 AvailabilityChange Changes[Unknown];
1034 ExprResult MessageExpr, ReplacementExpr;
1035
1036 // Opening '('.
1037 BalancedDelimiterTracker T(*this, tok::l_paren);
1038 if (T.consumeOpen()) {
1039 Diag(Tok, diag::err_expected) << tok::l_paren;
1040 return;
1041 }
1042
1043 // Parse the platform name.
1044 if (Tok.isNot(tok::identifier)) {
1045 Diag(Tok, diag::err_availability_expected_platform);
1046 SkipUntil(tok::r_paren, StopAtSemi);
1047 return;
1048 }
1049 IdentifierLoc *Platform = ParseIdentifierLoc();
1050 if (const IdentifierInfo *const Ident = Platform->Ident) {
1051 // Canonicalize platform name from "macosx" to "macos".
1052 if (Ident->getName() == "macosx")
1053 Platform->Ident = PP.getIdentifierInfo("macos");
1054 // Canonicalize platform name from "macosx_app_extension" to
1055 // "macos_app_extension".
1056 else if (Ident->getName() == "macosx_app_extension")
1057 Platform->Ident = PP.getIdentifierInfo("macos_app_extension");
1058 else
1059 Platform->Ident = PP.getIdentifierInfo(
1060 AvailabilityAttr::canonicalizePlatformName(Ident->getName()));
1061 }
1062
1063 // Parse the ',' following the platform name.
1064 if (ExpectAndConsume(tok::comma)) {
1065 SkipUntil(tok::r_paren, StopAtSemi);
1066 return;
1067 }
1068
1069 // If we haven't grabbed the pointers for the identifiers
1070 // "introduced", "deprecated", and "obsoleted", do so now.
1071 if (!Ident_introduced) {
1072 Ident_introduced = PP.getIdentifierInfo("introduced");
1073 Ident_deprecated = PP.getIdentifierInfo("deprecated");
1074 Ident_obsoleted = PP.getIdentifierInfo("obsoleted");
1075 Ident_unavailable = PP.getIdentifierInfo("unavailable");
1076 Ident_message = PP.getIdentifierInfo("message");
1077 Ident_strict = PP.getIdentifierInfo("strict");
1078 Ident_replacement = PP.getIdentifierInfo("replacement");
1079 }
1080
1081 // Parse the optional "strict", the optional "replacement" and the set of
1082 // introductions/deprecations/removals.
1083 SourceLocation UnavailableLoc, StrictLoc;
1084 do {
1085 if (Tok.isNot(tok::identifier)) {
1086 Diag(Tok, diag::err_availability_expected_change);
1087 SkipUntil(tok::r_paren, StopAtSemi);
1088 return;
1089 }
1090 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1091 SourceLocation KeywordLoc = ConsumeToken();
1092
1093 if (Keyword == Ident_strict) {
1094 if (StrictLoc.isValid()) {
1095 Diag(KeywordLoc, diag::err_availability_redundant)
1096 << Keyword << SourceRange(StrictLoc);
1097 }
1098 StrictLoc = KeywordLoc;
1099 continue;
1100 }
1101
1102 if (Keyword == Ident_unavailable) {
1103 if (UnavailableLoc.isValid()) {
1104 Diag(KeywordLoc, diag::err_availability_redundant)
1105 << Keyword << SourceRange(UnavailableLoc);
1106 }
1107 UnavailableLoc = KeywordLoc;
1108 continue;
1109 }
1110
1111 if (Keyword == Ident_deprecated && Platform->Ident &&
1112 Platform->Ident->isStr("swift")) {
1113 // For swift, we deprecate for all versions.
1114 if (Changes[Deprecated].KeywordLoc.isValid()) {
1115 Diag(KeywordLoc, diag::err_availability_redundant)
1116 << Keyword
1117 << SourceRange(Changes[Deprecated].KeywordLoc);
1118 }
1119
1120 Changes[Deprecated].KeywordLoc = KeywordLoc;
1121 // Use a fake version here.
1122 Changes[Deprecated].Version = VersionTuple(1);
1123 continue;
1124 }
1125
1126 if (Tok.isNot(tok::equal)) {
1127 Diag(Tok, diag::err_expected_after) << Keyword << tok::equal;
1128 SkipUntil(tok::r_paren, StopAtSemi);
1129 return;
1130 }
1131 ConsumeToken();
1132 if (Keyword == Ident_message || Keyword == Ident_replacement) {
1133 if (Tok.isNot(tok::string_literal)) {
1134 Diag(Tok, diag::err_expected_string_literal)
1135 << /*Source='availability attribute'*/2;
1136 SkipUntil(tok::r_paren, StopAtSemi);
1137 return;
1138 }
1139 if (Keyword == Ident_message)
1140 MessageExpr = ParseStringLiteralExpression();
1141 else
1142 ReplacementExpr = ParseStringLiteralExpression();
1143 // Also reject wide string literals.
1144 if (StringLiteral *MessageStringLiteral =
1145 cast_or_null<StringLiteral>(MessageExpr.get())) {
1146 if (!MessageStringLiteral->isAscii()) {
1147 Diag(MessageStringLiteral->getSourceRange().getBegin(),
1148 diag::err_expected_string_literal)
1149 << /*Source='availability attribute'*/ 2;
1150 SkipUntil(tok::r_paren, StopAtSemi);
1151 return;
1152 }
1153 }
1154 if (Keyword == Ident_message)
1155 break;
1156 else
1157 continue;
1158 }
1159
1160 // Special handling of 'NA' only when applied to introduced or
1161 // deprecated.
1162 if ((Keyword == Ident_introduced || Keyword == Ident_deprecated) &&
1163 Tok.is(tok::identifier)) {
1164 IdentifierInfo *NA = Tok.getIdentifierInfo();
1165 if (NA->getName() == "NA") {
1166 ConsumeToken();
1167 if (Keyword == Ident_introduced)
1168 UnavailableLoc = KeywordLoc;
1169 continue;
1170 }
1171 }
1172
1173 SourceRange VersionRange;
1174 VersionTuple Version = ParseVersionTuple(VersionRange);
1175
1176 if (Version.empty()) {
1177 SkipUntil(tok::r_paren, StopAtSemi);
1178 return;
1179 }
1180
1181 unsigned Index;
1182 if (Keyword == Ident_introduced)
1183 Index = Introduced;
1184 else if (Keyword == Ident_deprecated)
1185 Index = Deprecated;
1186 else if (Keyword == Ident_obsoleted)
1187 Index = Obsoleted;
1188 else
1189 Index = Unknown;
1190
1191 if (Index < Unknown) {
1192 if (!Changes[Index].KeywordLoc.isInvalid()) {
1193 Diag(KeywordLoc, diag::err_availability_redundant)
1194 << Keyword
1195 << SourceRange(Changes[Index].KeywordLoc,
1196 Changes[Index].VersionRange.getEnd());
1197 }
1198
1199 Changes[Index].KeywordLoc = KeywordLoc;
1200 Changes[Index].Version = Version;
1201 Changes[Index].VersionRange = VersionRange;
1202 } else {
1203 Diag(KeywordLoc, diag::err_availability_unknown_change)
1204 << Keyword << VersionRange;
1205 }
1206
1207 } while (TryConsumeToken(tok::comma));
1208
1209 // Closing ')'.
1210 if (T.consumeClose())
1211 return;
1212
1213 if (endLoc)
1214 *endLoc = T.getCloseLocation();
1215
1216 // The 'unavailable' availability cannot be combined with any other
1217 // availability changes. Make sure that hasn't happened.
1218 if (UnavailableLoc.isValid()) {
1219 bool Complained = false;
1220 for (unsigned Index = Introduced; Index != Unknown; ++Index) {
1221 if (Changes[Index].KeywordLoc.isValid()) {
1222 if (!Complained) {
1223 Diag(UnavailableLoc, diag::warn_availability_and_unavailable)
1224 << SourceRange(Changes[Index].KeywordLoc,
1225 Changes[Index].VersionRange.getEnd());
1226 Complained = true;
1227 }
1228
1229 // Clear out the availability.
1230 Changes[Index] = AvailabilityChange();
1231 }
1232 }
1233 }
1234
1235 // Record this attribute
1236 attrs.addNew(&Availability,
1237 SourceRange(AvailabilityLoc, T.getCloseLocation()),
1238 ScopeName, ScopeLoc,
1239 Platform,
1240 Changes[Introduced],
1241 Changes[Deprecated],
1242 Changes[Obsoleted],
1243 UnavailableLoc, MessageExpr.get(),
1244 Syntax, StrictLoc, ReplacementExpr.get());
1245 }
1246
1247 /// Parse the contents of the "external_source_symbol" attribute.
1248 ///
1249 /// external-source-symbol-attribute:
1250 /// 'external_source_symbol' '(' keyword-arg-list ')'
1251 ///
1252 /// keyword-arg-list:
1253 /// keyword-arg
1254 /// keyword-arg ',' keyword-arg-list
1255 ///
1256 /// keyword-arg:
1257 /// 'language' '=' <string>
1258 /// 'defined_in' '=' <string>
1259 /// 'generated_declaration'
ParseExternalSourceSymbolAttribute(IdentifierInfo & ExternalSourceSymbol,SourceLocation Loc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1260 void Parser::ParseExternalSourceSymbolAttribute(
1261 IdentifierInfo &ExternalSourceSymbol, SourceLocation Loc,
1262 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1263 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
1264 // Opening '('.
1265 BalancedDelimiterTracker T(*this, tok::l_paren);
1266 if (T.expectAndConsume())
1267 return;
1268
1269 // Initialize the pointers for the keyword identifiers when required.
1270 if (!Ident_language) {
1271 Ident_language = PP.getIdentifierInfo("language");
1272 Ident_defined_in = PP.getIdentifierInfo("defined_in");
1273 Ident_generated_declaration = PP.getIdentifierInfo("generated_declaration");
1274 }
1275
1276 ExprResult Language;
1277 bool HasLanguage = false;
1278 ExprResult DefinedInExpr;
1279 bool HasDefinedIn = false;
1280 IdentifierLoc *GeneratedDeclaration = nullptr;
1281
1282 // Parse the language/defined_in/generated_declaration keywords
1283 do {
1284 if (Tok.isNot(tok::identifier)) {
1285 Diag(Tok, diag::err_external_source_symbol_expected_keyword);
1286 SkipUntil(tok::r_paren, StopAtSemi);
1287 return;
1288 }
1289
1290 SourceLocation KeywordLoc = Tok.getLocation();
1291 IdentifierInfo *Keyword = Tok.getIdentifierInfo();
1292 if (Keyword == Ident_generated_declaration) {
1293 if (GeneratedDeclaration) {
1294 Diag(Tok, diag::err_external_source_symbol_duplicate_clause) << Keyword;
1295 SkipUntil(tok::r_paren, StopAtSemi);
1296 return;
1297 }
1298 GeneratedDeclaration = ParseIdentifierLoc();
1299 continue;
1300 }
1301
1302 if (Keyword != Ident_language && Keyword != Ident_defined_in) {
1303 Diag(Tok, diag::err_external_source_symbol_expected_keyword);
1304 SkipUntil(tok::r_paren, StopAtSemi);
1305 return;
1306 }
1307
1308 ConsumeToken();
1309 if (ExpectAndConsume(tok::equal, diag::err_expected_after,
1310 Keyword->getName())) {
1311 SkipUntil(tok::r_paren, StopAtSemi);
1312 return;
1313 }
1314
1315 bool HadLanguage = HasLanguage, HadDefinedIn = HasDefinedIn;
1316 if (Keyword == Ident_language)
1317 HasLanguage = true;
1318 else
1319 HasDefinedIn = true;
1320
1321 if (Tok.isNot(tok::string_literal)) {
1322 Diag(Tok, diag::err_expected_string_literal)
1323 << /*Source='external_source_symbol attribute'*/ 3
1324 << /*language | source container*/ (Keyword != Ident_language);
1325 SkipUntil(tok::comma, tok::r_paren, StopAtSemi | StopBeforeMatch);
1326 continue;
1327 }
1328 if (Keyword == Ident_language) {
1329 if (HadLanguage) {
1330 Diag(KeywordLoc, diag::err_external_source_symbol_duplicate_clause)
1331 << Keyword;
1332 ParseStringLiteralExpression();
1333 continue;
1334 }
1335 Language = ParseStringLiteralExpression();
1336 } else {
1337 assert(Keyword == Ident_defined_in && "Invalid clause keyword!");
1338 if (HadDefinedIn) {
1339 Diag(KeywordLoc, diag::err_external_source_symbol_duplicate_clause)
1340 << Keyword;
1341 ParseStringLiteralExpression();
1342 continue;
1343 }
1344 DefinedInExpr = ParseStringLiteralExpression();
1345 }
1346 } while (TryConsumeToken(tok::comma));
1347
1348 // Closing ')'.
1349 if (T.consumeClose())
1350 return;
1351 if (EndLoc)
1352 *EndLoc = T.getCloseLocation();
1353
1354 ArgsUnion Args[] = {Language.get(), DefinedInExpr.get(),
1355 GeneratedDeclaration};
1356 Attrs.addNew(&ExternalSourceSymbol, SourceRange(Loc, T.getCloseLocation()),
1357 ScopeName, ScopeLoc, Args, llvm::array_lengthof(Args), Syntax);
1358 }
1359
1360 /// Parse the contents of the "objc_bridge_related" attribute.
1361 /// objc_bridge_related '(' related_class ',' opt-class_method ',' opt-instance_method ')'
1362 /// related_class:
1363 /// Identifier
1364 ///
1365 /// opt-class_method:
1366 /// Identifier: | <empty>
1367 ///
1368 /// opt-instance_method:
1369 /// Identifier | <empty>
1370 ///
ParseObjCBridgeRelatedAttribute(IdentifierInfo & ObjCBridgeRelated,SourceLocation ObjCBridgeRelatedLoc,ParsedAttributes & attrs,SourceLocation * endLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1371 void Parser::ParseObjCBridgeRelatedAttribute(IdentifierInfo &ObjCBridgeRelated,
1372 SourceLocation ObjCBridgeRelatedLoc,
1373 ParsedAttributes &attrs,
1374 SourceLocation *endLoc,
1375 IdentifierInfo *ScopeName,
1376 SourceLocation ScopeLoc,
1377 ParsedAttr::Syntax Syntax) {
1378 // Opening '('.
1379 BalancedDelimiterTracker T(*this, tok::l_paren);
1380 if (T.consumeOpen()) {
1381 Diag(Tok, diag::err_expected) << tok::l_paren;
1382 return;
1383 }
1384
1385 // Parse the related class name.
1386 if (Tok.isNot(tok::identifier)) {
1387 Diag(Tok, diag::err_objcbridge_related_expected_related_class);
1388 SkipUntil(tok::r_paren, StopAtSemi);
1389 return;
1390 }
1391 IdentifierLoc *RelatedClass = ParseIdentifierLoc();
1392 if (ExpectAndConsume(tok::comma)) {
1393 SkipUntil(tok::r_paren, StopAtSemi);
1394 return;
1395 }
1396
1397 // Parse class method name. It's non-optional in the sense that a trailing
1398 // comma is required, but it can be the empty string, and then we record a
1399 // nullptr.
1400 IdentifierLoc *ClassMethod = nullptr;
1401 if (Tok.is(tok::identifier)) {
1402 ClassMethod = ParseIdentifierLoc();
1403 if (!TryConsumeToken(tok::colon)) {
1404 Diag(Tok, diag::err_objcbridge_related_selector_name);
1405 SkipUntil(tok::r_paren, StopAtSemi);
1406 return;
1407 }
1408 }
1409 if (!TryConsumeToken(tok::comma)) {
1410 if (Tok.is(tok::colon))
1411 Diag(Tok, diag::err_objcbridge_related_selector_name);
1412 else
1413 Diag(Tok, diag::err_expected) << tok::comma;
1414 SkipUntil(tok::r_paren, StopAtSemi);
1415 return;
1416 }
1417
1418 // Parse instance method name. Also non-optional but empty string is
1419 // permitted.
1420 IdentifierLoc *InstanceMethod = nullptr;
1421 if (Tok.is(tok::identifier))
1422 InstanceMethod = ParseIdentifierLoc();
1423 else if (Tok.isNot(tok::r_paren)) {
1424 Diag(Tok, diag::err_expected) << tok::r_paren;
1425 SkipUntil(tok::r_paren, StopAtSemi);
1426 return;
1427 }
1428
1429 // Closing ')'.
1430 if (T.consumeClose())
1431 return;
1432
1433 if (endLoc)
1434 *endLoc = T.getCloseLocation();
1435
1436 // Record this attribute
1437 attrs.addNew(&ObjCBridgeRelated,
1438 SourceRange(ObjCBridgeRelatedLoc, T.getCloseLocation()),
1439 ScopeName, ScopeLoc,
1440 RelatedClass,
1441 ClassMethod,
1442 InstanceMethod,
1443 Syntax);
1444 }
1445
1446
ParseSwiftNewTypeAttribute(IdentifierInfo & AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1447 void Parser::ParseSwiftNewTypeAttribute(
1448 IdentifierInfo &AttrName, SourceLocation AttrNameLoc,
1449 ParsedAttributes &Attrs, SourceLocation *EndLoc, IdentifierInfo *ScopeName,
1450 SourceLocation ScopeLoc, ParsedAttr::Syntax Syntax) {
1451 BalancedDelimiterTracker T(*this, tok::l_paren);
1452
1453 // Opening '('
1454 if (T.consumeOpen()) {
1455 Diag(Tok, diag::err_expected) << tok::l_paren;
1456 return;
1457 }
1458
1459 if (Tok.is(tok::r_paren)) {
1460 Diag(Tok.getLocation(), diag::err_argument_required_after_attribute);
1461 T.consumeClose();
1462 return;
1463 }
1464 if (Tok.isNot(tok::kw_struct) && Tok.isNot(tok::kw_enum)) {
1465 Diag(Tok, diag::warn_attribute_type_not_supported)
1466 << &AttrName << Tok.getIdentifierInfo();
1467 if (!isTokenSpecial())
1468 ConsumeToken();
1469 T.consumeClose();
1470 return;
1471 }
1472
1473 auto *SwiftType = IdentifierLoc::create(Actions.Context, Tok.getLocation(),
1474 Tok.getIdentifierInfo());
1475 ConsumeToken();
1476
1477 // Closing ')'
1478 if (T.consumeClose())
1479 return;
1480 if (EndLoc)
1481 *EndLoc = T.getCloseLocation();
1482
1483 ArgsUnion Args[] = {SwiftType};
1484 Attrs.addNew(&AttrName, SourceRange(AttrNameLoc, T.getCloseLocation()),
1485 ScopeName, ScopeLoc, Args, llvm::array_lengthof(Args), Syntax);
1486 }
1487
1488
ParseTypeTagForDatatypeAttribute(IdentifierInfo & AttrName,SourceLocation AttrNameLoc,ParsedAttributes & Attrs,SourceLocation * EndLoc,IdentifierInfo * ScopeName,SourceLocation ScopeLoc,ParsedAttr::Syntax Syntax)1489 void Parser::ParseTypeTagForDatatypeAttribute(IdentifierInfo &AttrName,
1490 SourceLocation AttrNameLoc,
1491 ParsedAttributes &Attrs,
1492 SourceLocation *EndLoc,
1493 IdentifierInfo *ScopeName,
1494 SourceLocation ScopeLoc,
1495 ParsedAttr::Syntax Syntax) {
1496 assert(Tok.is(tok::l_paren) && "Attribute arg list not starting with '('");
1497
1498 BalancedDelimiterTracker T(*this, tok::l_paren);
1499 T.consumeOpen();
1500
1501 if (Tok.isNot(tok::identifier)) {
1502 Diag(Tok, diag::err_expected) << tok::identifier;
1503 T.skipToEnd();
1504 return;
1505 }
1506 IdentifierLoc *ArgumentKind = ParseIdentifierLoc();
1507
1508 if (ExpectAndConsume(tok::comma)) {
1509 T.skipToEnd();
1510 return;
1511 }
1512
1513 SourceRange MatchingCTypeRange;
1514 TypeResult MatchingCType = ParseTypeName(&MatchingCTypeRange);
1515 if (MatchingCType.isInvalid()) {
1516 T.skipToEnd();
1517 return;
1518 }
1519
1520 bool LayoutCompatible = false;
1521 bool MustBeNull = false;
1522 while (TryConsumeToken(tok::comma)) {
1523 if (Tok.isNot(tok::identifier)) {
1524 Diag(Tok, diag::err_expected) << tok::identifier;
1525 T.skipToEnd();
1526 return;
1527 }
1528 IdentifierInfo *Flag = Tok.getIdentifierInfo();
1529 if (Flag->isStr("layout_compatible"))
1530 LayoutCompatible = true;
1531 else if (Flag->isStr("must_be_null"))
1532 MustBeNull = true;
1533 else {
1534 Diag(Tok, diag::err_type_safety_unknown_flag) << Flag;
1535 T.skipToEnd();
1536 return;
1537 }
1538 ConsumeToken(); // consume flag
1539 }
1540
1541 if (!T.consumeClose()) {
1542 Attrs.addNewTypeTagForDatatype(&AttrName, AttrNameLoc, ScopeName, ScopeLoc,
1543 ArgumentKind, MatchingCType.get(),
1544 LayoutCompatible, MustBeNull, Syntax);
1545 }
1546
1547 if (EndLoc)
1548 *EndLoc = T.getCloseLocation();
1549 }
1550
1551 /// DiagnoseProhibitedCXX11Attribute - We have found the opening square brackets
1552 /// of a C++11 attribute-specifier in a location where an attribute is not
1553 /// permitted. By C++11 [dcl.attr.grammar]p6, this is ill-formed. Diagnose this
1554 /// situation.
1555 ///
1556 /// \return \c true if we skipped an attribute-like chunk of tokens, \c false if
1557 /// this doesn't appear to actually be an attribute-specifier, and the caller
1558 /// should try to parse it.
DiagnoseProhibitedCXX11Attribute()1559 bool Parser::DiagnoseProhibitedCXX11Attribute() {
1560 assert(Tok.is(tok::l_square) && NextToken().is(tok::l_square));
1561
1562 switch (isCXX11AttributeSpecifier(/*Disambiguate*/true)) {
1563 case CAK_NotAttributeSpecifier:
1564 // No diagnostic: we're in Obj-C++11 and this is not actually an attribute.
1565 return false;
1566
1567 case CAK_InvalidAttributeSpecifier:
1568 Diag(Tok.getLocation(), diag::err_l_square_l_square_not_attribute);
1569 return false;
1570
1571 case CAK_AttributeSpecifier:
1572 // Parse and discard the attributes.
1573 SourceLocation BeginLoc = ConsumeBracket();
1574 ConsumeBracket();
1575 SkipUntil(tok::r_square);
1576 assert(Tok.is(tok::r_square) && "isCXX11AttributeSpecifier lied");
1577 SourceLocation EndLoc = ConsumeBracket();
1578 Diag(BeginLoc, diag::err_attributes_not_allowed)
1579 << SourceRange(BeginLoc, EndLoc);
1580 return true;
1581 }
1582 llvm_unreachable("All cases handled above.");
1583 }
1584
1585 /// We have found the opening square brackets of a C++11
1586 /// attribute-specifier in a location where an attribute is not permitted, but
1587 /// we know where the attributes ought to be written. Parse them anyway, and
1588 /// provide a fixit moving them to the right place.
DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange & Attrs,SourceLocation CorrectLocation)1589 void Parser::DiagnoseMisplacedCXX11Attribute(ParsedAttributesWithRange &Attrs,
1590 SourceLocation CorrectLocation) {
1591 assert((Tok.is(tok::l_square) && NextToken().is(tok::l_square)) ||
1592 Tok.is(tok::kw_alignas));
1593
1594 // Consume the attributes.
1595 SourceLocation Loc = Tok.getLocation();
1596 ParseCXX11Attributes(Attrs);
1597 CharSourceRange AttrRange(SourceRange(Loc, Attrs.Range.getEnd()), true);
1598 // FIXME: use err_attributes_misplaced
1599 Diag(Loc, diag::err_attributes_not_allowed)
1600 << FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange)
1601 << FixItHint::CreateRemoval(AttrRange);
1602 }
1603
DiagnoseProhibitedAttributes(const SourceRange & Range,const SourceLocation CorrectLocation)1604 void Parser::DiagnoseProhibitedAttributes(
1605 const SourceRange &Range, const SourceLocation CorrectLocation) {
1606 if (CorrectLocation.isValid()) {
1607 CharSourceRange AttrRange(Range, true);
1608 Diag(CorrectLocation, diag::err_attributes_misplaced)
1609 << FixItHint::CreateInsertionFromRange(CorrectLocation, AttrRange)
1610 << FixItHint::CreateRemoval(AttrRange);
1611 } else
1612 Diag(Range.getBegin(), diag::err_attributes_not_allowed) << Range;
1613 }
1614
ProhibitCXX11Attributes(ParsedAttributesWithRange & Attrs,unsigned DiagID,bool DiagnoseEmptyAttrs)1615 void Parser::ProhibitCXX11Attributes(ParsedAttributesWithRange &Attrs,
1616 unsigned DiagID, bool DiagnoseEmptyAttrs) {
1617
1618 if (DiagnoseEmptyAttrs && Attrs.empty() && Attrs.Range.isValid()) {
1619 // An attribute list has been parsed, but it was empty.
1620 // This is the case for [[]].
1621 const auto &LangOpts = getLangOpts();
1622 auto &SM = PP.getSourceManager();
1623 Token FirstLSquare;
1624 Lexer::getRawToken(Attrs.Range.getBegin(), FirstLSquare, SM, LangOpts);
1625
1626 if (FirstLSquare.is(tok::l_square)) {
1627 llvm::Optional<Token> SecondLSquare =
1628 Lexer::findNextToken(FirstLSquare.getLocation(), SM, LangOpts);
1629
1630 if (SecondLSquare && SecondLSquare->is(tok::l_square)) {
1631 // The attribute range starts with [[, but is empty. So this must
1632 // be [[]], which we are supposed to diagnose because
1633 // DiagnoseEmptyAttrs is true.
1634 Diag(Attrs.Range.getBegin(), DiagID) << Attrs.Range;
1635 return;
1636 }
1637 }
1638 }
1639
1640 for (const ParsedAttr &AL : Attrs) {
1641 if (!AL.isCXX11Attribute() && !AL.isC2xAttribute())
1642 continue;
1643 if (AL.getKind() == ParsedAttr::UnknownAttribute)
1644 Diag(AL.getLoc(), diag::warn_unknown_attribute_ignored)
1645 << AL << AL.getRange();
1646 else {
1647 Diag(AL.getLoc(), DiagID) << AL;
1648 AL.setInvalid();
1649 }
1650 }
1651 }
1652
DiagnoseCXX11AttributeExtension(ParsedAttributesWithRange & Attrs)1653 void Parser::DiagnoseCXX11AttributeExtension(ParsedAttributesWithRange &Attrs) {
1654 for (const ParsedAttr &PA : Attrs) {
1655 if (PA.isCXX11Attribute() || PA.isC2xAttribute())
1656 Diag(PA.getLoc(), diag::ext_cxx11_attr_placement) << PA << PA.getRange();
1657 }
1658 }
1659
1660 // Usually, `__attribute__((attrib)) class Foo {} var` means that attribute
1661 // applies to var, not the type Foo.
1662 // As an exception to the rule, __declspec(align(...)) before the
1663 // class-key affects the type instead of the variable.
1664 // Also, Microsoft-style [attributes] seem to affect the type instead of the
1665 // variable.
1666 // This function moves attributes that should apply to the type off DS to Attrs.
stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange & Attrs,DeclSpec & DS,Sema::TagUseKind TUK)1667 void Parser::stripTypeAttributesOffDeclSpec(ParsedAttributesWithRange &Attrs,
1668 DeclSpec &DS,
1669 Sema::TagUseKind TUK) {
1670 if (TUK == Sema::TUK_Reference)
1671 return;
1672
1673 llvm::SmallVector<ParsedAttr *, 1> ToBeMoved;
1674
1675 for (ParsedAttr &AL : DS.getAttributes()) {
1676 if ((AL.getKind() == ParsedAttr::AT_Aligned &&
1677 AL.isDeclspecAttribute()) ||
1678 AL.isMicrosoftAttribute())
1679 ToBeMoved.push_back(&AL);
1680 }
1681
1682 for (ParsedAttr *AL : ToBeMoved) {
1683 DS.getAttributes().remove(AL);
1684 Attrs.addAtEnd(AL);
1685 }
1686 }
1687
1688 /// ParseDeclaration - Parse a full 'declaration', which consists of
1689 /// declaration-specifiers, some number of declarators, and a semicolon.
1690 /// 'Context' should be a DeclaratorContext value. This returns the
1691 /// location of the semicolon in DeclEnd.
1692 ///
1693 /// declaration: [C99 6.7]
1694 /// block-declaration ->
1695 /// simple-declaration
1696 /// others [FIXME]
1697 /// [C++] template-declaration
1698 /// [C++] namespace-definition
1699 /// [C++] using-directive
1700 /// [C++] using-declaration
1701 /// [C++11/C11] static_assert-declaration
1702 /// others... [FIXME]
1703 ///
1704 Parser::DeclGroupPtrTy
ParseDeclaration(DeclaratorContext Context,SourceLocation & DeclEnd,ParsedAttributesWithRange & attrs,SourceLocation * DeclSpecStart)1705 Parser::ParseDeclaration(DeclaratorContext Context, SourceLocation &DeclEnd,
1706 ParsedAttributesWithRange &attrs,
1707 SourceLocation *DeclSpecStart) {
1708 ParenBraceBracketBalancer BalancerRAIIObj(*this);
1709 // Must temporarily exit the objective-c container scope for
1710 // parsing c none objective-c decls.
1711 ObjCDeclContextSwitch ObjCDC(*this);
1712
1713 Decl *SingleDecl = nullptr;
1714 switch (Tok.getKind()) {
1715 case tok::kw_template:
1716 case tok::kw_export:
1717 ProhibitAttributes(attrs);
1718 SingleDecl = ParseDeclarationStartingWithTemplate(Context, DeclEnd, attrs);
1719 break;
1720 case tok::kw_inline:
1721 // Could be the start of an inline namespace. Allowed as an ext in C++03.
1722 if (getLangOpts().CPlusPlus && NextToken().is(tok::kw_namespace)) {
1723 ProhibitAttributes(attrs);
1724 SourceLocation InlineLoc = ConsumeToken();
1725 return ParseNamespace(Context, DeclEnd, InlineLoc);
1726 }
1727 return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
1728 DeclSpecStart);
1729 case tok::kw_namespace:
1730 ProhibitAttributes(attrs);
1731 return ParseNamespace(Context, DeclEnd);
1732 case tok::kw_using:
1733 return ParseUsingDirectiveOrDeclaration(Context, ParsedTemplateInfo(),
1734 DeclEnd, attrs);
1735 case tok::kw_static_assert:
1736 case tok::kw__Static_assert:
1737 ProhibitAttributes(attrs);
1738 SingleDecl = ParseStaticAssertDeclaration(DeclEnd);
1739 break;
1740 default:
1741 return ParseSimpleDeclaration(Context, DeclEnd, attrs, true, nullptr,
1742 DeclSpecStart);
1743 }
1744
1745 // This routine returns a DeclGroup, if the thing we parsed only contains a
1746 // single decl, convert it now.
1747 return Actions.ConvertDeclToDeclGroup(SingleDecl);
1748 }
1749
1750 /// simple-declaration: [C99 6.7: declaration] [C++ 7p1: dcl.dcl]
1751 /// declaration-specifiers init-declarator-list[opt] ';'
1752 /// [C++11] attribute-specifier-seq decl-specifier-seq[opt]
1753 /// init-declarator-list ';'
1754 ///[C90/C++]init-declarator-list ';' [TODO]
1755 /// [OMP] threadprivate-directive
1756 /// [OMP] allocate-directive [TODO]
1757 ///
1758 /// for-range-declaration: [C++11 6.5p1: stmt.ranged]
1759 /// attribute-specifier-seq[opt] type-specifier-seq declarator
1760 ///
1761 /// If RequireSemi is false, this does not check for a ';' at the end of the
1762 /// declaration. If it is true, it checks for and eats it.
1763 ///
1764 /// If FRI is non-null, we might be parsing a for-range-declaration instead
1765 /// of a simple-declaration. If we find that we are, we also parse the
1766 /// for-range-initializer, and place it here.
1767 ///
1768 /// DeclSpecStart is used when decl-specifiers are parsed before parsing
1769 /// the Declaration. The SourceLocation for this Decl is set to
1770 /// DeclSpecStart if DeclSpecStart is non-null.
ParseSimpleDeclaration(DeclaratorContext Context,SourceLocation & DeclEnd,ParsedAttributesWithRange & Attrs,bool RequireSemi,ForRangeInit * FRI,SourceLocation * DeclSpecStart)1771 Parser::DeclGroupPtrTy Parser::ParseSimpleDeclaration(
1772 DeclaratorContext Context, SourceLocation &DeclEnd,
1773 ParsedAttributesWithRange &Attrs, bool RequireSemi, ForRangeInit *FRI,
1774 SourceLocation *DeclSpecStart) {
1775 // Parse the common declaration-specifiers piece.
1776 ParsingDeclSpec DS(*this);
1777
1778 DeclSpecContext DSContext = getDeclSpecContextFromDeclaratorContext(Context);
1779 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS_none, DSContext);
1780
1781 // If we had a free-standing type definition with a missing semicolon, we
1782 // may get this far before the problem becomes obvious.
1783 if (DS.hasTagDefinition() &&
1784 DiagnoseMissingSemiAfterTagDefinition(DS, AS_none, DSContext))
1785 return nullptr;
1786
1787 // C99 6.7.2.3p6: Handle "struct-or-union identifier;", "enum { X };"
1788 // declaration-specifiers init-declarator-list[opt] ';'
1789 if (Tok.is(tok::semi)) {
1790 ProhibitAttributes(Attrs);
1791 DeclEnd = Tok.getLocation();
1792 if (RequireSemi) ConsumeToken();
1793 RecordDecl *AnonRecord = nullptr;
1794 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
1795 DS, AnonRecord);
1796 DS.complete(TheDecl);
1797 if (AnonRecord) {
1798 Decl* decls[] = {AnonRecord, TheDecl};
1799 return Actions.BuildDeclaratorGroup(decls);
1800 }
1801 return Actions.ConvertDeclToDeclGroup(TheDecl);
1802 }
1803
1804 if (DeclSpecStart)
1805 DS.SetRangeStart(*DeclSpecStart);
1806
1807 DS.takeAttributesFrom(Attrs);
1808 return ParseDeclGroup(DS, Context, &DeclEnd, FRI);
1809 }
1810
1811 /// Returns true if this might be the start of a declarator, or a common typo
1812 /// for a declarator.
MightBeDeclarator(DeclaratorContext Context)1813 bool Parser::MightBeDeclarator(DeclaratorContext Context) {
1814 switch (Tok.getKind()) {
1815 case tok::annot_cxxscope:
1816 case tok::annot_template_id:
1817 case tok::caret:
1818 case tok::code_completion:
1819 case tok::coloncolon:
1820 case tok::ellipsis:
1821 case tok::kw___attribute:
1822 case tok::kw_operator:
1823 case tok::l_paren:
1824 case tok::star:
1825 return true;
1826
1827 case tok::amp:
1828 case tok::ampamp:
1829 return getLangOpts().CPlusPlus;
1830
1831 case tok::l_square: // Might be an attribute on an unnamed bit-field.
1832 return Context == DeclaratorContext::Member && getLangOpts().CPlusPlus11 &&
1833 NextToken().is(tok::l_square);
1834
1835 case tok::colon: // Might be a typo for '::' or an unnamed bit-field.
1836 return Context == DeclaratorContext::Member || getLangOpts().CPlusPlus;
1837
1838 case tok::identifier:
1839 switch (NextToken().getKind()) {
1840 case tok::code_completion:
1841 case tok::coloncolon:
1842 case tok::comma:
1843 case tok::equal:
1844 case tok::equalequal: // Might be a typo for '='.
1845 case tok::kw_alignas:
1846 case tok::kw_asm:
1847 case tok::kw___attribute:
1848 case tok::l_brace:
1849 case tok::l_paren:
1850 case tok::l_square:
1851 case tok::less:
1852 case tok::r_brace:
1853 case tok::r_paren:
1854 case tok::r_square:
1855 case tok::semi:
1856 return true;
1857
1858 case tok::colon:
1859 // At namespace scope, 'identifier:' is probably a typo for 'identifier::'
1860 // and in block scope it's probably a label. Inside a class definition,
1861 // this is a bit-field.
1862 return Context == DeclaratorContext::Member ||
1863 (getLangOpts().CPlusPlus && Context == DeclaratorContext::File);
1864
1865 case tok::identifier: // Possible virt-specifier.
1866 return getLangOpts().CPlusPlus11 && isCXX11VirtSpecifier(NextToken());
1867
1868 default:
1869 return false;
1870 }
1871
1872 default:
1873 return false;
1874 }
1875 }
1876
1877 /// Skip until we reach something which seems like a sensible place to pick
1878 /// up parsing after a malformed declaration. This will sometimes stop sooner
1879 /// than SkipUntil(tok::r_brace) would, but will never stop later.
SkipMalformedDecl()1880 void Parser::SkipMalformedDecl() {
1881 while (true) {
1882 switch (Tok.getKind()) {
1883 case tok::l_brace:
1884 // Skip until matching }, then stop. We've probably skipped over
1885 // a malformed class or function definition or similar.
1886 ConsumeBrace();
1887 SkipUntil(tok::r_brace);
1888 if (Tok.isOneOf(tok::comma, tok::l_brace, tok::kw_try)) {
1889 // This declaration isn't over yet. Keep skipping.
1890 continue;
1891 }
1892 TryConsumeToken(tok::semi);
1893 return;
1894
1895 case tok::l_square:
1896 ConsumeBracket();
1897 SkipUntil(tok::r_square);
1898 continue;
1899
1900 case tok::l_paren:
1901 ConsumeParen();
1902 SkipUntil(tok::r_paren);
1903 continue;
1904
1905 case tok::r_brace:
1906 return;
1907
1908 case tok::semi:
1909 ConsumeToken();
1910 return;
1911
1912 case tok::kw_inline:
1913 // 'inline namespace' at the start of a line is almost certainly
1914 // a good place to pick back up parsing, except in an Objective-C
1915 // @interface context.
1916 if (Tok.isAtStartOfLine() && NextToken().is(tok::kw_namespace) &&
1917 (!ParsingInObjCContainer || CurParsedObjCImpl))
1918 return;
1919 break;
1920
1921 case tok::kw_namespace:
1922 // 'namespace' at the start of a line is almost certainly a good
1923 // place to pick back up parsing, except in an Objective-C
1924 // @interface context.
1925 if (Tok.isAtStartOfLine() &&
1926 (!ParsingInObjCContainer || CurParsedObjCImpl))
1927 return;
1928 break;
1929
1930 case tok::at:
1931 // @end is very much like } in Objective-C contexts.
1932 if (NextToken().isObjCAtKeyword(tok::objc_end) &&
1933 ParsingInObjCContainer)
1934 return;
1935 break;
1936
1937 case tok::minus:
1938 case tok::plus:
1939 // - and + probably start new method declarations in Objective-C contexts.
1940 if (Tok.isAtStartOfLine() && ParsingInObjCContainer)
1941 return;
1942 break;
1943
1944 case tok::eof:
1945 case tok::annot_module_begin:
1946 case tok::annot_module_end:
1947 case tok::annot_module_include:
1948 return;
1949
1950 default:
1951 break;
1952 }
1953
1954 ConsumeAnyToken();
1955 }
1956 }
1957
1958 /// ParseDeclGroup - Having concluded that this is either a function
1959 /// definition or a group of object declarations, actually parse the
1960 /// result.
ParseDeclGroup(ParsingDeclSpec & DS,DeclaratorContext Context,SourceLocation * DeclEnd,ForRangeInit * FRI)1961 Parser::DeclGroupPtrTy Parser::ParseDeclGroup(ParsingDeclSpec &DS,
1962 DeclaratorContext Context,
1963 SourceLocation *DeclEnd,
1964 ForRangeInit *FRI) {
1965 // Parse the first declarator.
1966 ParsingDeclarator D(*this, DS, Context);
1967 ParseDeclarator(D);
1968
1969 // Bail out if the first declarator didn't seem well-formed.
1970 if (!D.hasName() && !D.mayOmitIdentifier()) {
1971 SkipMalformedDecl();
1972 return nullptr;
1973 }
1974
1975 if (Tok.is(tok::kw_requires))
1976 ParseTrailingRequiresClause(D);
1977
1978 // Save late-parsed attributes for now; they need to be parsed in the
1979 // appropriate function scope after the function Decl has been constructed.
1980 // These will be parsed in ParseFunctionDefinition or ParseLexedAttrList.
1981 LateParsedAttrList LateParsedAttrs(true);
1982 if (D.isFunctionDeclarator()) {
1983 MaybeParseGNUAttributes(D, &LateParsedAttrs);
1984
1985 // The _Noreturn keyword can't appear here, unlike the GNU noreturn
1986 // attribute. If we find the keyword here, tell the user to put it
1987 // at the start instead.
1988 if (Tok.is(tok::kw__Noreturn)) {
1989 SourceLocation Loc = ConsumeToken();
1990 const char *PrevSpec;
1991 unsigned DiagID;
1992
1993 // We can offer a fixit if it's valid to mark this function as _Noreturn
1994 // and we don't have any other declarators in this declaration.
1995 bool Fixit = !DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
1996 MaybeParseGNUAttributes(D, &LateParsedAttrs);
1997 Fixit &= Tok.isOneOf(tok::semi, tok::l_brace, tok::kw_try);
1998
1999 Diag(Loc, diag::err_c11_noreturn_misplaced)
2000 << (Fixit ? FixItHint::CreateRemoval(Loc) : FixItHint())
2001 << (Fixit ? FixItHint::CreateInsertion(D.getBeginLoc(), "_Noreturn ")
2002 : FixItHint());
2003 }
2004 }
2005
2006 // Check to see if we have a function *definition* which must have a body.
2007 if (D.isFunctionDeclarator()) {
2008 if (Tok.is(tok::equal) && NextToken().is(tok::code_completion)) {
2009 cutOffParsing();
2010 Actions.CodeCompleteAfterFunctionEquals(D);
2011 return nullptr;
2012 }
2013 // Look at the next token to make sure that this isn't a function
2014 // declaration. We have to check this because __attribute__ might be the
2015 // start of a function definition in GCC-extended K&R C.
2016 if (!isDeclarationAfterDeclarator()) {
2017
2018 // Function definitions are only allowed at file scope and in C++ classes.
2019 // The C++ inline method definition case is handled elsewhere, so we only
2020 // need to handle the file scope definition case.
2021 if (Context == DeclaratorContext::File) {
2022 if (isStartOfFunctionDefinition(D)) {
2023 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
2024 Diag(Tok, diag::err_function_declared_typedef);
2025
2026 // Recover by treating the 'typedef' as spurious.
2027 DS.ClearStorageClassSpecs();
2028 }
2029
2030 Decl *TheDecl = ParseFunctionDefinition(D, ParsedTemplateInfo(),
2031 &LateParsedAttrs);
2032 return Actions.ConvertDeclToDeclGroup(TheDecl);
2033 }
2034
2035 if (isDeclarationSpecifier()) {
2036 // If there is an invalid declaration specifier right after the
2037 // function prototype, then we must be in a missing semicolon case
2038 // where this isn't actually a body. Just fall through into the code
2039 // that handles it as a prototype, and let the top-level code handle
2040 // the erroneous declspec where it would otherwise expect a comma or
2041 // semicolon.
2042 } else {
2043 Diag(Tok, diag::err_expected_fn_body);
2044 SkipUntil(tok::semi);
2045 return nullptr;
2046 }
2047 } else {
2048 if (Tok.is(tok::l_brace)) {
2049 Diag(Tok, diag::err_function_definition_not_allowed);
2050 SkipMalformedDecl();
2051 return nullptr;
2052 }
2053 }
2054 }
2055 }
2056
2057 if (ParseAsmAttributesAfterDeclarator(D))
2058 return nullptr;
2059
2060 // C++0x [stmt.iter]p1: Check if we have a for-range-declarator. If so, we
2061 // must parse and analyze the for-range-initializer before the declaration is
2062 // analyzed.
2063 //
2064 // Handle the Objective-C for-in loop variable similarly, although we
2065 // don't need to parse the container in advance.
2066 if (FRI && (Tok.is(tok::colon) || isTokIdentifier_in())) {
2067 bool IsForRangeLoop = false;
2068 if (TryConsumeToken(tok::colon, FRI->ColonLoc)) {
2069 IsForRangeLoop = true;
2070 if (getLangOpts().OpenMP)
2071 Actions.startOpenMPCXXRangeFor();
2072 if (Tok.is(tok::l_brace))
2073 FRI->RangeExpr = ParseBraceInitializer();
2074 else
2075 FRI->RangeExpr = ParseExpression();
2076 }
2077
2078 Decl *ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
2079 if (IsForRangeLoop) {
2080 Actions.ActOnCXXForRangeDecl(ThisDecl);
2081 } else {
2082 // Obj-C for loop
2083 if (auto *VD = dyn_cast_or_null<VarDecl>(ThisDecl))
2084 VD->setObjCForDecl(true);
2085 }
2086 Actions.FinalizeDeclaration(ThisDecl);
2087 D.complete(ThisDecl);
2088 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, ThisDecl);
2089 }
2090
2091 SmallVector<Decl *, 8> DeclsInGroup;
2092 Decl *FirstDecl = ParseDeclarationAfterDeclaratorAndAttributes(
2093 D, ParsedTemplateInfo(), FRI);
2094 if (LateParsedAttrs.size() > 0)
2095 ParseLexedAttributeList(LateParsedAttrs, FirstDecl, true, false);
2096 D.complete(FirstDecl);
2097 if (FirstDecl)
2098 DeclsInGroup.push_back(FirstDecl);
2099
2100 bool ExpectSemi = Context != DeclaratorContext::ForInit;
2101
2102 // If we don't have a comma, it is either the end of the list (a ';') or an
2103 // error, bail out.
2104 SourceLocation CommaLoc;
2105 while (TryConsumeToken(tok::comma, CommaLoc)) {
2106 if (Tok.isAtStartOfLine() && ExpectSemi && !MightBeDeclarator(Context)) {
2107 // This comma was followed by a line-break and something which can't be
2108 // the start of a declarator. The comma was probably a typo for a
2109 // semicolon.
2110 Diag(CommaLoc, diag::err_expected_semi_declaration)
2111 << FixItHint::CreateReplacement(CommaLoc, ";");
2112 ExpectSemi = false;
2113 break;
2114 }
2115
2116 // Parse the next declarator.
2117 D.clear();
2118 D.setCommaLoc(CommaLoc);
2119
2120 // Accept attributes in an init-declarator. In the first declarator in a
2121 // declaration, these would be part of the declspec. In subsequent
2122 // declarators, they become part of the declarator itself, so that they
2123 // don't apply to declarators after *this* one. Examples:
2124 // short __attribute__((common)) var; -> declspec
2125 // short var __attribute__((common)); -> declarator
2126 // short x, __attribute__((common)) var; -> declarator
2127 MaybeParseGNUAttributes(D);
2128
2129 // MSVC parses but ignores qualifiers after the comma as an extension.
2130 if (getLangOpts().MicrosoftExt)
2131 DiagnoseAndSkipExtendedMicrosoftTypeAttributes();
2132
2133 ParseDeclarator(D);
2134 if (!D.isInvalidType()) {
2135 // C++2a [dcl.decl]p1
2136 // init-declarator:
2137 // declarator initializer[opt]
2138 // declarator requires-clause
2139 if (Tok.is(tok::kw_requires))
2140 ParseTrailingRequiresClause(D);
2141 Decl *ThisDecl = ParseDeclarationAfterDeclarator(D);
2142 D.complete(ThisDecl);
2143 if (ThisDecl)
2144 DeclsInGroup.push_back(ThisDecl);
2145 }
2146 }
2147
2148 if (DeclEnd)
2149 *DeclEnd = Tok.getLocation();
2150
2151 if (ExpectSemi && ExpectAndConsumeSemi(
2152 Context == DeclaratorContext::File
2153 ? diag::err_invalid_token_after_toplevel_declarator
2154 : diag::err_expected_semi_declaration)) {
2155 // Okay, there was no semicolon and one was expected. If we see a
2156 // declaration specifier, just assume it was missing and continue parsing.
2157 // Otherwise things are very confused and we skip to recover.
2158 if (!isDeclarationSpecifier()) {
2159 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
2160 TryConsumeToken(tok::semi);
2161 }
2162 }
2163
2164 return Actions.FinalizeDeclaratorGroup(getCurScope(), DS, DeclsInGroup);
2165 }
2166
2167 /// Parse an optional simple-asm-expr and attributes, and attach them to a
2168 /// declarator. Returns true on an error.
ParseAsmAttributesAfterDeclarator(Declarator & D)2169 bool Parser::ParseAsmAttributesAfterDeclarator(Declarator &D) {
2170 // If a simple-asm-expr is present, parse it.
2171 if (Tok.is(tok::kw_asm)) {
2172 SourceLocation Loc;
2173 ExprResult AsmLabel(ParseSimpleAsm(/*ForAsmLabel*/ true, &Loc));
2174 if (AsmLabel.isInvalid()) {
2175 SkipUntil(tok::semi, StopBeforeMatch);
2176 return true;
2177 }
2178
2179 D.setAsmLabel(AsmLabel.get());
2180 D.SetRangeEnd(Loc);
2181 }
2182
2183 MaybeParseGNUAttributes(D);
2184 return false;
2185 }
2186
2187 /// Parse 'declaration' after parsing 'declaration-specifiers
2188 /// declarator'. This method parses the remainder of the declaration
2189 /// (including any attributes or initializer, among other things) and
2190 /// finalizes the declaration.
2191 ///
2192 /// init-declarator: [C99 6.7]
2193 /// declarator
2194 /// declarator '=' initializer
2195 /// [GNU] declarator simple-asm-expr[opt] attributes[opt]
2196 /// [GNU] declarator simple-asm-expr[opt] attributes[opt] '=' initializer
2197 /// [C++] declarator initializer[opt]
2198 ///
2199 /// [C++] initializer:
2200 /// [C++] '=' initializer-clause
2201 /// [C++] '(' expression-list ')'
2202 /// [C++0x] '=' 'default' [TODO]
2203 /// [C++0x] '=' 'delete'
2204 /// [C++0x] braced-init-list
2205 ///
2206 /// According to the standard grammar, =default and =delete are function
2207 /// definitions, but that definitely doesn't fit with the parser here.
2208 ///
ParseDeclarationAfterDeclarator(Declarator & D,const ParsedTemplateInfo & TemplateInfo)2209 Decl *Parser::ParseDeclarationAfterDeclarator(
2210 Declarator &D, const ParsedTemplateInfo &TemplateInfo) {
2211 if (ParseAsmAttributesAfterDeclarator(D))
2212 return nullptr;
2213
2214 return ParseDeclarationAfterDeclaratorAndAttributes(D, TemplateInfo);
2215 }
2216
ParseDeclarationAfterDeclaratorAndAttributes(Declarator & D,const ParsedTemplateInfo & TemplateInfo,ForRangeInit * FRI)2217 Decl *Parser::ParseDeclarationAfterDeclaratorAndAttributes(
2218 Declarator &D, const ParsedTemplateInfo &TemplateInfo, ForRangeInit *FRI) {
2219 // RAII type used to track whether we're inside an initializer.
2220 struct InitializerScopeRAII {
2221 Parser &P;
2222 Declarator &D;
2223 Decl *ThisDecl;
2224
2225 InitializerScopeRAII(Parser &P, Declarator &D, Decl *ThisDecl)
2226 : P(P), D(D), ThisDecl(ThisDecl) {
2227 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2228 Scope *S = nullptr;
2229 if (D.getCXXScopeSpec().isSet()) {
2230 P.EnterScope(0);
2231 S = P.getCurScope();
2232 }
2233 P.Actions.ActOnCXXEnterDeclInitializer(S, ThisDecl);
2234 }
2235 }
2236 ~InitializerScopeRAII() { pop(); }
2237 void pop() {
2238 if (ThisDecl && P.getLangOpts().CPlusPlus) {
2239 Scope *S = nullptr;
2240 if (D.getCXXScopeSpec().isSet())
2241 S = P.getCurScope();
2242 P.Actions.ActOnCXXExitDeclInitializer(S, ThisDecl);
2243 if (S)
2244 P.ExitScope();
2245 }
2246 ThisDecl = nullptr;
2247 }
2248 };
2249
2250 enum class InitKind { Uninitialized, Equal, CXXDirect, CXXBraced };
2251 InitKind TheInitKind;
2252 // If a '==' or '+=' is found, suggest a fixit to '='.
2253 if (isTokenEqualOrEqualTypo())
2254 TheInitKind = InitKind::Equal;
2255 else if (Tok.is(tok::l_paren))
2256 TheInitKind = InitKind::CXXDirect;
2257 else if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace) &&
2258 (!CurParsedObjCImpl || !D.isFunctionDeclarator()))
2259 TheInitKind = InitKind::CXXBraced;
2260 else
2261 TheInitKind = InitKind::Uninitialized;
2262 if (TheInitKind != InitKind::Uninitialized)
2263 D.setHasInitializer();
2264
2265 // Inform Sema that we just parsed this declarator.
2266 Decl *ThisDecl = nullptr;
2267 Decl *OuterDecl = nullptr;
2268 switch (TemplateInfo.Kind) {
2269 case ParsedTemplateInfo::NonTemplate:
2270 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
2271 break;
2272
2273 case ParsedTemplateInfo::Template:
2274 case ParsedTemplateInfo::ExplicitSpecialization: {
2275 ThisDecl = Actions.ActOnTemplateDeclarator(getCurScope(),
2276 *TemplateInfo.TemplateParams,
2277 D);
2278 if (VarTemplateDecl *VT = dyn_cast_or_null<VarTemplateDecl>(ThisDecl)) {
2279 // Re-direct this decl to refer to the templated decl so that we can
2280 // initialize it.
2281 ThisDecl = VT->getTemplatedDecl();
2282 OuterDecl = VT;
2283 }
2284 break;
2285 }
2286 case ParsedTemplateInfo::ExplicitInstantiation: {
2287 if (Tok.is(tok::semi)) {
2288 DeclResult ThisRes = Actions.ActOnExplicitInstantiation(
2289 getCurScope(), TemplateInfo.ExternLoc, TemplateInfo.TemplateLoc, D);
2290 if (ThisRes.isInvalid()) {
2291 SkipUntil(tok::semi, StopBeforeMatch);
2292 return nullptr;
2293 }
2294 ThisDecl = ThisRes.get();
2295 } else {
2296 // FIXME: This check should be for a variable template instantiation only.
2297
2298 // Check that this is a valid instantiation
2299 if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) {
2300 // If the declarator-id is not a template-id, issue a diagnostic and
2301 // recover by ignoring the 'template' keyword.
2302 Diag(Tok, diag::err_template_defn_explicit_instantiation)
2303 << 2 << FixItHint::CreateRemoval(TemplateInfo.TemplateLoc);
2304 ThisDecl = Actions.ActOnDeclarator(getCurScope(), D);
2305 } else {
2306 SourceLocation LAngleLoc =
2307 PP.getLocForEndOfToken(TemplateInfo.TemplateLoc);
2308 Diag(D.getIdentifierLoc(),
2309 diag::err_explicit_instantiation_with_definition)
2310 << SourceRange(TemplateInfo.TemplateLoc)
2311 << FixItHint::CreateInsertion(LAngleLoc, "<>");
2312
2313 // Recover as if it were an explicit specialization.
2314 TemplateParameterLists FakedParamLists;
2315 FakedParamLists.push_back(Actions.ActOnTemplateParameterList(
2316 0, SourceLocation(), TemplateInfo.TemplateLoc, LAngleLoc, None,
2317 LAngleLoc, nullptr));
2318
2319 ThisDecl =
2320 Actions.ActOnTemplateDeclarator(getCurScope(), FakedParamLists, D);
2321 }
2322 }
2323 break;
2324 }
2325 }
2326
2327 switch (TheInitKind) {
2328 // Parse declarator '=' initializer.
2329 case InitKind::Equal: {
2330 SourceLocation EqualLoc = ConsumeToken();
2331
2332 if (Tok.is(tok::kw_delete)) {
2333 if (D.isFunctionDeclarator())
2334 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2335 << 1 /* delete */;
2336 else
2337 Diag(ConsumeToken(), diag::err_deleted_non_function);
2338 } else if (Tok.is(tok::kw_default)) {
2339 if (D.isFunctionDeclarator())
2340 Diag(ConsumeToken(), diag::err_default_delete_in_multiple_declaration)
2341 << 0 /* default */;
2342 else
2343 Diag(ConsumeToken(), diag::err_default_special_members)
2344 << getLangOpts().CPlusPlus20;
2345 } else {
2346 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2347
2348 if (Tok.is(tok::code_completion)) {
2349 cutOffParsing();
2350 Actions.CodeCompleteInitializer(getCurScope(), ThisDecl);
2351 Actions.FinalizeDeclaration(ThisDecl);
2352 return nullptr;
2353 }
2354
2355 PreferredType.enterVariableInit(Tok.getLocation(), ThisDecl);
2356 ExprResult Init = ParseInitializer();
2357
2358 // If this is the only decl in (possibly) range based for statement,
2359 // our best guess is that the user meant ':' instead of '='.
2360 if (Tok.is(tok::r_paren) && FRI && D.isFirstDeclarator()) {
2361 Diag(EqualLoc, diag::err_single_decl_assign_in_for_range)
2362 << FixItHint::CreateReplacement(EqualLoc, ":");
2363 // We are trying to stop parser from looking for ';' in this for
2364 // statement, therefore preventing spurious errors to be issued.
2365 FRI->ColonLoc = EqualLoc;
2366 Init = ExprError();
2367 FRI->RangeExpr = Init;
2368 }
2369
2370 InitScope.pop();
2371
2372 if (Init.isInvalid()) {
2373 SmallVector<tok::TokenKind, 2> StopTokens;
2374 StopTokens.push_back(tok::comma);
2375 if (D.getContext() == DeclaratorContext::ForInit ||
2376 D.getContext() == DeclaratorContext::SelectionInit)
2377 StopTokens.push_back(tok::r_paren);
2378 SkipUntil(StopTokens, StopAtSemi | StopBeforeMatch);
2379 Actions.ActOnInitializerError(ThisDecl);
2380 } else
2381 Actions.AddInitializerToDecl(ThisDecl, Init.get(),
2382 /*DirectInit=*/false);
2383 }
2384 break;
2385 }
2386 case InitKind::CXXDirect: {
2387 // Parse C++ direct initializer: '(' expression-list ')'
2388 BalancedDelimiterTracker T(*this, tok::l_paren);
2389 T.consumeOpen();
2390
2391 ExprVector Exprs;
2392 CommaLocsTy CommaLocs;
2393
2394 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2395
2396 auto ThisVarDecl = dyn_cast_or_null<VarDecl>(ThisDecl);
2397 auto RunSignatureHelp = [&]() {
2398 QualType PreferredType = Actions.ProduceConstructorSignatureHelp(
2399 getCurScope(), ThisVarDecl->getType()->getCanonicalTypeInternal(),
2400 ThisDecl->getLocation(), Exprs, T.getOpenLocation());
2401 CalledSignatureHelp = true;
2402 return PreferredType;
2403 };
2404 auto SetPreferredType = [&] {
2405 PreferredType.enterFunctionArgument(Tok.getLocation(), RunSignatureHelp);
2406 };
2407
2408 llvm::function_ref<void()> ExpressionStarts;
2409 if (ThisVarDecl) {
2410 // ParseExpressionList can sometimes succeed even when ThisDecl is not
2411 // VarDecl. This is an error and it is reported in a call to
2412 // Actions.ActOnInitializerError(). However, we call
2413 // ProduceConstructorSignatureHelp only on VarDecls.
2414 ExpressionStarts = SetPreferredType;
2415 }
2416 if (ParseExpressionList(Exprs, CommaLocs, ExpressionStarts)) {
2417 if (ThisVarDecl && PP.isCodeCompletionReached() && !CalledSignatureHelp) {
2418 Actions.ProduceConstructorSignatureHelp(
2419 getCurScope(), ThisVarDecl->getType()->getCanonicalTypeInternal(),
2420 ThisDecl->getLocation(), Exprs, T.getOpenLocation());
2421 CalledSignatureHelp = true;
2422 }
2423 Actions.ActOnInitializerError(ThisDecl);
2424 SkipUntil(tok::r_paren, StopAtSemi);
2425 } else {
2426 // Match the ')'.
2427 T.consumeClose();
2428
2429 assert(!Exprs.empty() && Exprs.size()-1 == CommaLocs.size() &&
2430 "Unexpected number of commas!");
2431
2432 InitScope.pop();
2433
2434 ExprResult Initializer = Actions.ActOnParenListExpr(T.getOpenLocation(),
2435 T.getCloseLocation(),
2436 Exprs);
2437 Actions.AddInitializerToDecl(ThisDecl, Initializer.get(),
2438 /*DirectInit=*/true);
2439 }
2440 break;
2441 }
2442 case InitKind::CXXBraced: {
2443 // Parse C++0x braced-init-list.
2444 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2445
2446 InitializerScopeRAII InitScope(*this, D, ThisDecl);
2447
2448 PreferredType.enterVariableInit(Tok.getLocation(), ThisDecl);
2449 ExprResult Init(ParseBraceInitializer());
2450
2451 InitScope.pop();
2452
2453 if (Init.isInvalid()) {
2454 Actions.ActOnInitializerError(ThisDecl);
2455 } else
2456 Actions.AddInitializerToDecl(ThisDecl, Init.get(), /*DirectInit=*/true);
2457 break;
2458 }
2459 case InitKind::Uninitialized: {
2460 Actions.ActOnUninitializedDecl(ThisDecl);
2461 break;
2462 }
2463 }
2464
2465 Actions.FinalizeDeclaration(ThisDecl);
2466 return OuterDecl ? OuterDecl : ThisDecl;
2467 }
2468
2469 /// ParseSpecifierQualifierList
2470 /// specifier-qualifier-list:
2471 /// type-specifier specifier-qualifier-list[opt]
2472 /// type-qualifier specifier-qualifier-list[opt]
2473 /// [GNU] attributes specifier-qualifier-list[opt]
2474 ///
ParseSpecifierQualifierList(DeclSpec & DS,AccessSpecifier AS,DeclSpecContext DSC)2475 void Parser::ParseSpecifierQualifierList(DeclSpec &DS, AccessSpecifier AS,
2476 DeclSpecContext DSC) {
2477 /// specifier-qualifier-list is a subset of declaration-specifiers. Just
2478 /// parse declaration-specifiers and complain about extra stuff.
2479 /// TODO: diagnose attribute-specifiers and alignment-specifiers.
2480 ParseDeclarationSpecifiers(DS, ParsedTemplateInfo(), AS, DSC);
2481
2482 // Validate declspec for type-name.
2483 unsigned Specs = DS.getParsedSpecifiers();
2484 if (isTypeSpecifier(DSC) && !DS.hasTypeSpecifier()) {
2485 Diag(Tok, diag::err_expected_type);
2486 DS.SetTypeSpecError();
2487 } else if (Specs == DeclSpec::PQ_None && !DS.hasAttributes()) {
2488 Diag(Tok, diag::err_typename_requires_specqual);
2489 if (!DS.hasTypeSpecifier())
2490 DS.SetTypeSpecError();
2491 }
2492
2493 // Issue diagnostic and remove storage class if present.
2494 if (Specs & DeclSpec::PQ_StorageClassSpecifier) {
2495 if (DS.getStorageClassSpecLoc().isValid())
2496 Diag(DS.getStorageClassSpecLoc(),diag::err_typename_invalid_storageclass);
2497 else
2498 Diag(DS.getThreadStorageClassSpecLoc(),
2499 diag::err_typename_invalid_storageclass);
2500 DS.ClearStorageClassSpecs();
2501 }
2502
2503 // Issue diagnostic and remove function specifier if present.
2504 if (Specs & DeclSpec::PQ_FunctionSpecifier) {
2505 if (DS.isInlineSpecified())
2506 Diag(DS.getInlineSpecLoc(), diag::err_typename_invalid_functionspec);
2507 if (DS.isVirtualSpecified())
2508 Diag(DS.getVirtualSpecLoc(), diag::err_typename_invalid_functionspec);
2509 if (DS.hasExplicitSpecifier())
2510 Diag(DS.getExplicitSpecLoc(), diag::err_typename_invalid_functionspec);
2511 DS.ClearFunctionSpecs();
2512 }
2513
2514 // Issue diagnostic and remove constexpr specifier if present.
2515 if (DS.hasConstexprSpecifier() && DSC != DeclSpecContext::DSC_condition) {
2516 Diag(DS.getConstexprSpecLoc(), diag::err_typename_invalid_constexpr)
2517 << static_cast<int>(DS.getConstexprSpecifier());
2518 DS.ClearConstexprSpec();
2519 }
2520 }
2521
2522 /// isValidAfterIdentifierInDeclaratorAfterDeclSpec - Return true if the
2523 /// specified token is valid after the identifier in a declarator which
2524 /// immediately follows the declspec. For example, these things are valid:
2525 ///
2526 /// int x [ 4]; // direct-declarator
2527 /// int x ( int y); // direct-declarator
2528 /// int(int x ) // direct-declarator
2529 /// int x ; // simple-declaration
2530 /// int x = 17; // init-declarator-list
2531 /// int x , y; // init-declarator-list
2532 /// int x __asm__ ("foo"); // init-declarator-list
2533 /// int x : 4; // struct-declarator
2534 /// int x { 5}; // C++'0x unified initializers
2535 ///
2536 /// This is not, because 'x' does not immediately follow the declspec (though
2537 /// ')' happens to be valid anyway).
2538 /// int (x)
2539 ///
isValidAfterIdentifierInDeclarator(const Token & T)2540 static bool isValidAfterIdentifierInDeclarator(const Token &T) {
2541 return T.isOneOf(tok::l_square, tok::l_paren, tok::r_paren, tok::semi,
2542 tok::comma, tok::equal, tok::kw_asm, tok::l_brace,
2543 tok::colon);
2544 }
2545
2546 /// ParseImplicitInt - This method is called when we have an non-typename
2547 /// identifier in a declspec (which normally terminates the decl spec) when
2548 /// the declspec has no type specifier. In this case, the declspec is either
2549 /// malformed or is "implicit int" (in K&R and C89).
2550 ///
2551 /// This method handles diagnosing this prettily and returns false if the
2552 /// declspec is done being processed. If it recovers and thinks there may be
2553 /// other pieces of declspec after it, it returns true.
2554 ///
ParseImplicitInt(DeclSpec & DS,CXXScopeSpec * SS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSC,ParsedAttributesWithRange & Attrs)2555 bool Parser::ParseImplicitInt(DeclSpec &DS, CXXScopeSpec *SS,
2556 const ParsedTemplateInfo &TemplateInfo,
2557 AccessSpecifier AS, DeclSpecContext DSC,
2558 ParsedAttributesWithRange &Attrs) {
2559 assert(Tok.is(tok::identifier) && "should have identifier");
2560
2561 SourceLocation Loc = Tok.getLocation();
2562 // If we see an identifier that is not a type name, we normally would
2563 // parse it as the identifier being declared. However, when a typename
2564 // is typo'd or the definition is not included, this will incorrectly
2565 // parse the typename as the identifier name and fall over misparsing
2566 // later parts of the diagnostic.
2567 //
2568 // As such, we try to do some look-ahead in cases where this would
2569 // otherwise be an "implicit-int" case to see if this is invalid. For
2570 // example: "static foo_t x = 4;" In this case, if we parsed foo_t as
2571 // an identifier with implicit int, we'd get a parse error because the
2572 // next token is obviously invalid for a type. Parse these as a case
2573 // with an invalid type specifier.
2574 assert(!DS.hasTypeSpecifier() && "Type specifier checked above");
2575
2576 // Since we know that this either implicit int (which is rare) or an
2577 // error, do lookahead to try to do better recovery. This never applies
2578 // within a type specifier. Outside of C++, we allow this even if the
2579 // language doesn't "officially" support implicit int -- we support
2580 // implicit int as an extension in C99 and C11.
2581 if (!isTypeSpecifier(DSC) && !getLangOpts().CPlusPlus &&
2582 isValidAfterIdentifierInDeclarator(NextToken())) {
2583 // If this token is valid for implicit int, e.g. "static x = 4", then
2584 // we just avoid eating the identifier, so it will be parsed as the
2585 // identifier in the declarator.
2586 return false;
2587 }
2588
2589 // Early exit as Sema has a dedicated missing_actual_pipe_type diagnostic
2590 // for incomplete declarations such as `pipe p`.
2591 if (getLangOpts().OpenCLCPlusPlus && DS.isTypeSpecPipe())
2592 return false;
2593
2594 if (getLangOpts().CPlusPlus &&
2595 DS.getStorageClassSpec() == DeclSpec::SCS_auto) {
2596 // Don't require a type specifier if we have the 'auto' storage class
2597 // specifier in C++98 -- we'll promote it to a type specifier.
2598 if (SS)
2599 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
2600 return false;
2601 }
2602
2603 if (getLangOpts().CPlusPlus && (!SS || SS->isEmpty()) &&
2604 getLangOpts().MSVCCompat) {
2605 // Lookup of an unqualified type name has failed in MSVC compatibility mode.
2606 // Give Sema a chance to recover if we are in a template with dependent base
2607 // classes.
2608 if (ParsedType T = Actions.ActOnMSVCUnknownTypeName(
2609 *Tok.getIdentifierInfo(), Tok.getLocation(),
2610 DSC == DeclSpecContext::DSC_template_type_arg)) {
2611 const char *PrevSpec;
2612 unsigned DiagID;
2613 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
2614 Actions.getASTContext().getPrintingPolicy());
2615 DS.SetRangeEnd(Tok.getLocation());
2616 ConsumeToken();
2617 return false;
2618 }
2619 }
2620
2621 // Otherwise, if we don't consume this token, we are going to emit an
2622 // error anyway. Try to recover from various common problems. Check
2623 // to see if this was a reference to a tag name without a tag specified.
2624 // This is a common problem in C (saying 'foo' instead of 'struct foo').
2625 //
2626 // C++ doesn't need this, and isTagName doesn't take SS.
2627 if (SS == nullptr) {
2628 const char *TagName = nullptr, *FixitTagName = nullptr;
2629 tok::TokenKind TagKind = tok::unknown;
2630
2631 switch (Actions.isTagName(*Tok.getIdentifierInfo(), getCurScope())) {
2632 default: break;
2633 case DeclSpec::TST_enum:
2634 TagName="enum" ; FixitTagName = "enum " ; TagKind=tok::kw_enum ;break;
2635 case DeclSpec::TST_union:
2636 TagName="union" ; FixitTagName = "union " ;TagKind=tok::kw_union ;break;
2637 case DeclSpec::TST_struct:
2638 TagName="struct"; FixitTagName = "struct ";TagKind=tok::kw_struct;break;
2639 case DeclSpec::TST_interface:
2640 TagName="__interface"; FixitTagName = "__interface ";
2641 TagKind=tok::kw___interface;break;
2642 case DeclSpec::TST_class:
2643 TagName="class" ; FixitTagName = "class " ;TagKind=tok::kw_class ;break;
2644 }
2645
2646 if (TagName) {
2647 IdentifierInfo *TokenName = Tok.getIdentifierInfo();
2648 LookupResult R(Actions, TokenName, SourceLocation(),
2649 Sema::LookupOrdinaryName);
2650
2651 Diag(Loc, diag::err_use_of_tag_name_without_tag)
2652 << TokenName << TagName << getLangOpts().CPlusPlus
2653 << FixItHint::CreateInsertion(Tok.getLocation(), FixitTagName);
2654
2655 if (Actions.LookupParsedName(R, getCurScope(), SS)) {
2656 for (LookupResult::iterator I = R.begin(), IEnd = R.end();
2657 I != IEnd; ++I)
2658 Diag((*I)->getLocation(), diag::note_decl_hiding_tag_type)
2659 << TokenName << TagName;
2660 }
2661
2662 // Parse this as a tag as if the missing tag were present.
2663 if (TagKind == tok::kw_enum)
2664 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS,
2665 DeclSpecContext::DSC_normal);
2666 else
2667 ParseClassSpecifier(TagKind, Loc, DS, TemplateInfo, AS,
2668 /*EnteringContext*/ false,
2669 DeclSpecContext::DSC_normal, Attrs);
2670 return true;
2671 }
2672 }
2673
2674 // Determine whether this identifier could plausibly be the name of something
2675 // being declared (with a missing type).
2676 if (!isTypeSpecifier(DSC) && (!SS || DSC == DeclSpecContext::DSC_top_level ||
2677 DSC == DeclSpecContext::DSC_class)) {
2678 // Look ahead to the next token to try to figure out what this declaration
2679 // was supposed to be.
2680 switch (NextToken().getKind()) {
2681 case tok::l_paren: {
2682 // static x(4); // 'x' is not a type
2683 // x(int n); // 'x' is not a type
2684 // x (*p)[]; // 'x' is a type
2685 //
2686 // Since we're in an error case, we can afford to perform a tentative
2687 // parse to determine which case we're in.
2688 TentativeParsingAction PA(*this);
2689 ConsumeToken();
2690 TPResult TPR = TryParseDeclarator(/*mayBeAbstract*/false);
2691 PA.Revert();
2692
2693 if (TPR != TPResult::False) {
2694 // The identifier is followed by a parenthesized declarator.
2695 // It's supposed to be a type.
2696 break;
2697 }
2698
2699 // If we're in a context where we could be declaring a constructor,
2700 // check whether this is a constructor declaration with a bogus name.
2701 if (DSC == DeclSpecContext::DSC_class ||
2702 (DSC == DeclSpecContext::DSC_top_level && SS)) {
2703 IdentifierInfo *II = Tok.getIdentifierInfo();
2704 if (Actions.isCurrentClassNameTypo(II, SS)) {
2705 Diag(Loc, diag::err_constructor_bad_name)
2706 << Tok.getIdentifierInfo() << II
2707 << FixItHint::CreateReplacement(Tok.getLocation(), II->getName());
2708 Tok.setIdentifierInfo(II);
2709 }
2710 }
2711 // Fall through.
2712 LLVM_FALLTHROUGH;
2713 }
2714 case tok::comma:
2715 case tok::equal:
2716 case tok::kw_asm:
2717 case tok::l_brace:
2718 case tok::l_square:
2719 case tok::semi:
2720 // This looks like a variable or function declaration. The type is
2721 // probably missing. We're done parsing decl-specifiers.
2722 // But only if we are not in a function prototype scope.
2723 if (getCurScope()->isFunctionPrototypeScope())
2724 break;
2725 if (SS)
2726 AnnotateScopeToken(*SS, /*IsNewAnnotation*/false);
2727 return false;
2728
2729 default:
2730 // This is probably supposed to be a type. This includes cases like:
2731 // int f(itn);
2732 // struct S { unsigned : 4; };
2733 break;
2734 }
2735 }
2736
2737 // This is almost certainly an invalid type name. Let Sema emit a diagnostic
2738 // and attempt to recover.
2739 ParsedType T;
2740 IdentifierInfo *II = Tok.getIdentifierInfo();
2741 bool IsTemplateName = getLangOpts().CPlusPlus && NextToken().is(tok::less);
2742 Actions.DiagnoseUnknownTypeName(II, Loc, getCurScope(), SS, T,
2743 IsTemplateName);
2744 if (T) {
2745 // The action has suggested that the type T could be used. Set that as
2746 // the type in the declaration specifiers, consume the would-be type
2747 // name token, and we're done.
2748 const char *PrevSpec;
2749 unsigned DiagID;
2750 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID, T,
2751 Actions.getASTContext().getPrintingPolicy());
2752 DS.SetRangeEnd(Tok.getLocation());
2753 ConsumeToken();
2754 // There may be other declaration specifiers after this.
2755 return true;
2756 } else if (II != Tok.getIdentifierInfo()) {
2757 // If no type was suggested, the correction is to a keyword
2758 Tok.setKind(II->getTokenID());
2759 // There may be other declaration specifiers after this.
2760 return true;
2761 }
2762
2763 // Otherwise, the action had no suggestion for us. Mark this as an error.
2764 DS.SetTypeSpecError();
2765 DS.SetRangeEnd(Tok.getLocation());
2766 ConsumeToken();
2767
2768 // Eat any following template arguments.
2769 if (IsTemplateName) {
2770 SourceLocation LAngle, RAngle;
2771 TemplateArgList Args;
2772 ParseTemplateIdAfterTemplateName(true, LAngle, Args, RAngle);
2773 }
2774
2775 // TODO: Could inject an invalid typedef decl in an enclosing scope to
2776 // avoid rippling error messages on subsequent uses of the same type,
2777 // could be useful if #include was forgotten.
2778 return true;
2779 }
2780
2781 /// Determine the declaration specifier context from the declarator
2782 /// context.
2783 ///
2784 /// \param Context the declarator context, which is one of the
2785 /// DeclaratorContext enumerator values.
2786 Parser::DeclSpecContext
getDeclSpecContextFromDeclaratorContext(DeclaratorContext Context)2787 Parser::getDeclSpecContextFromDeclaratorContext(DeclaratorContext Context) {
2788 if (Context == DeclaratorContext::Member)
2789 return DeclSpecContext::DSC_class;
2790 if (Context == DeclaratorContext::File)
2791 return DeclSpecContext::DSC_top_level;
2792 if (Context == DeclaratorContext::TemplateParam)
2793 return DeclSpecContext::DSC_template_param;
2794 if (Context == DeclaratorContext::TemplateArg ||
2795 Context == DeclaratorContext::TemplateTypeArg)
2796 return DeclSpecContext::DSC_template_type_arg;
2797 if (Context == DeclaratorContext::TrailingReturn ||
2798 Context == DeclaratorContext::TrailingReturnVar)
2799 return DeclSpecContext::DSC_trailing;
2800 if (Context == DeclaratorContext::AliasDecl ||
2801 Context == DeclaratorContext::AliasTemplate)
2802 return DeclSpecContext::DSC_alias_declaration;
2803 return DeclSpecContext::DSC_normal;
2804 }
2805
2806 /// ParseAlignArgument - Parse the argument to an alignment-specifier.
2807 ///
2808 /// FIXME: Simply returns an alignof() expression if the argument is a
2809 /// type. Ideally, the type should be propagated directly into Sema.
2810 ///
2811 /// [C11] type-id
2812 /// [C11] constant-expression
2813 /// [C++0x] type-id ...[opt]
2814 /// [C++0x] assignment-expression ...[opt]
ParseAlignArgument(SourceLocation Start,SourceLocation & EllipsisLoc)2815 ExprResult Parser::ParseAlignArgument(SourceLocation Start,
2816 SourceLocation &EllipsisLoc) {
2817 ExprResult ER;
2818 if (isTypeIdInParens()) {
2819 SourceLocation TypeLoc = Tok.getLocation();
2820 ParsedType Ty = ParseTypeName().get();
2821 SourceRange TypeRange(Start, Tok.getLocation());
2822 ER = Actions.ActOnUnaryExprOrTypeTraitExpr(TypeLoc, UETT_AlignOf, true,
2823 Ty.getAsOpaquePtr(), TypeRange);
2824 } else
2825 ER = ParseConstantExpression();
2826
2827 if (getLangOpts().CPlusPlus11)
2828 TryConsumeToken(tok::ellipsis, EllipsisLoc);
2829
2830 return ER;
2831 }
2832
2833 /// ParseAlignmentSpecifier - Parse an alignment-specifier, and add the
2834 /// attribute to Attrs.
2835 ///
2836 /// alignment-specifier:
2837 /// [C11] '_Alignas' '(' type-id ')'
2838 /// [C11] '_Alignas' '(' constant-expression ')'
2839 /// [C++11] 'alignas' '(' type-id ...[opt] ')'
2840 /// [C++11] 'alignas' '(' assignment-expression ...[opt] ')'
ParseAlignmentSpecifier(ParsedAttributes & Attrs,SourceLocation * EndLoc)2841 void Parser::ParseAlignmentSpecifier(ParsedAttributes &Attrs,
2842 SourceLocation *EndLoc) {
2843 assert(Tok.isOneOf(tok::kw_alignas, tok::kw__Alignas) &&
2844 "Not an alignment-specifier!");
2845
2846 IdentifierInfo *KWName = Tok.getIdentifierInfo();
2847 SourceLocation KWLoc = ConsumeToken();
2848
2849 BalancedDelimiterTracker T(*this, tok::l_paren);
2850 if (T.expectAndConsume())
2851 return;
2852
2853 SourceLocation EllipsisLoc;
2854 ExprResult ArgExpr = ParseAlignArgument(T.getOpenLocation(), EllipsisLoc);
2855 if (ArgExpr.isInvalid()) {
2856 T.skipToEnd();
2857 return;
2858 }
2859
2860 T.consumeClose();
2861 if (EndLoc)
2862 *EndLoc = T.getCloseLocation();
2863
2864 ArgsVector ArgExprs;
2865 ArgExprs.push_back(ArgExpr.get());
2866 Attrs.addNew(KWName, KWLoc, nullptr, KWLoc, ArgExprs.data(), 1,
2867 ParsedAttr::AS_Keyword, EllipsisLoc);
2868 }
2869
ParseExtIntegerArgument()2870 ExprResult Parser::ParseExtIntegerArgument() {
2871 assert(Tok.is(tok::kw__ExtInt) && "Not an extended int type");
2872 ConsumeToken();
2873
2874 BalancedDelimiterTracker T(*this, tok::l_paren);
2875 if (T.expectAndConsume())
2876 return ExprError();
2877
2878 ExprResult ER = ParseConstantExpression();
2879 if (ER.isInvalid()) {
2880 T.skipToEnd();
2881 return ExprError();
2882 }
2883
2884 if(T.consumeClose())
2885 return ExprError();
2886 return ER;
2887 }
2888
2889 /// Determine whether we're looking at something that might be a declarator
2890 /// in a simple-declaration. If it can't possibly be a declarator, maybe
2891 /// diagnose a missing semicolon after a prior tag definition in the decl
2892 /// specifier.
2893 ///
2894 /// \return \c true if an error occurred and this can't be any kind of
2895 /// declaration.
2896 bool
DiagnoseMissingSemiAfterTagDefinition(DeclSpec & DS,AccessSpecifier AS,DeclSpecContext DSContext,LateParsedAttrList * LateAttrs)2897 Parser::DiagnoseMissingSemiAfterTagDefinition(DeclSpec &DS, AccessSpecifier AS,
2898 DeclSpecContext DSContext,
2899 LateParsedAttrList *LateAttrs) {
2900 assert(DS.hasTagDefinition() && "shouldn't call this");
2901
2902 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
2903 DSContext == DeclSpecContext::DSC_top_level);
2904
2905 if (getLangOpts().CPlusPlus &&
2906 Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw_decltype,
2907 tok::annot_template_id) &&
2908 TryAnnotateCXXScopeToken(EnteringContext)) {
2909 SkipMalformedDecl();
2910 return true;
2911 }
2912
2913 bool HasScope = Tok.is(tok::annot_cxxscope);
2914 // Make a copy in case GetLookAheadToken invalidates the result of NextToken.
2915 Token AfterScope = HasScope ? NextToken() : Tok;
2916
2917 // Determine whether the following tokens could possibly be a
2918 // declarator.
2919 bool MightBeDeclarator = true;
2920 if (Tok.isOneOf(tok::kw_typename, tok::annot_typename)) {
2921 // A declarator-id can't start with 'typename'.
2922 MightBeDeclarator = false;
2923 } else if (AfterScope.is(tok::annot_template_id)) {
2924 // If we have a type expressed as a template-id, this cannot be a
2925 // declarator-id (such a type cannot be redeclared in a simple-declaration).
2926 TemplateIdAnnotation *Annot =
2927 static_cast<TemplateIdAnnotation *>(AfterScope.getAnnotationValue());
2928 if (Annot->Kind == TNK_Type_template)
2929 MightBeDeclarator = false;
2930 } else if (AfterScope.is(tok::identifier)) {
2931 const Token &Next = HasScope ? GetLookAheadToken(2) : NextToken();
2932
2933 // These tokens cannot come after the declarator-id in a
2934 // simple-declaration, and are likely to come after a type-specifier.
2935 if (Next.isOneOf(tok::star, tok::amp, tok::ampamp, tok::identifier,
2936 tok::annot_cxxscope, tok::coloncolon)) {
2937 // Missing a semicolon.
2938 MightBeDeclarator = false;
2939 } else if (HasScope) {
2940 // If the declarator-id has a scope specifier, it must redeclare a
2941 // previously-declared entity. If that's a type (and this is not a
2942 // typedef), that's an error.
2943 CXXScopeSpec SS;
2944 Actions.RestoreNestedNameSpecifierAnnotation(
2945 Tok.getAnnotationValue(), Tok.getAnnotationRange(), SS);
2946 IdentifierInfo *Name = AfterScope.getIdentifierInfo();
2947 Sema::NameClassification Classification = Actions.ClassifyName(
2948 getCurScope(), SS, Name, AfterScope.getLocation(), Next,
2949 /*CCC=*/nullptr);
2950 switch (Classification.getKind()) {
2951 case Sema::NC_Error:
2952 SkipMalformedDecl();
2953 return true;
2954
2955 case Sema::NC_Keyword:
2956 llvm_unreachable("typo correction is not possible here");
2957
2958 case Sema::NC_Type:
2959 case Sema::NC_TypeTemplate:
2960 case Sema::NC_UndeclaredNonType:
2961 case Sema::NC_UndeclaredTemplate:
2962 // Not a previously-declared non-type entity.
2963 MightBeDeclarator = false;
2964 break;
2965
2966 case Sema::NC_Unknown:
2967 case Sema::NC_NonType:
2968 case Sema::NC_DependentNonType:
2969 case Sema::NC_OverloadSet:
2970 case Sema::NC_VarTemplate:
2971 case Sema::NC_FunctionTemplate:
2972 case Sema::NC_Concept:
2973 // Might be a redeclaration of a prior entity.
2974 break;
2975 }
2976 }
2977 }
2978
2979 if (MightBeDeclarator)
2980 return false;
2981
2982 const PrintingPolicy &PPol = Actions.getASTContext().getPrintingPolicy();
2983 Diag(PP.getLocForEndOfToken(DS.getRepAsDecl()->getEndLoc()),
2984 diag::err_expected_after)
2985 << DeclSpec::getSpecifierName(DS.getTypeSpecType(), PPol) << tok::semi;
2986
2987 // Try to recover from the typo, by dropping the tag definition and parsing
2988 // the problematic tokens as a type.
2989 //
2990 // FIXME: Split the DeclSpec into pieces for the standalone
2991 // declaration and pieces for the following declaration, instead
2992 // of assuming that all the other pieces attach to new declaration,
2993 // and call ParsedFreeStandingDeclSpec as appropriate.
2994 DS.ClearTypeSpecType();
2995 ParsedTemplateInfo NotATemplate;
2996 ParseDeclarationSpecifiers(DS, NotATemplate, AS, DSContext, LateAttrs);
2997 return false;
2998 }
2999
3000 // Choose the apprpriate diagnostic error for why fixed point types are
3001 // disabled, set the previous specifier, and mark as invalid.
SetupFixedPointError(const LangOptions & LangOpts,const char * & PrevSpec,unsigned & DiagID,bool & isInvalid)3002 static void SetupFixedPointError(const LangOptions &LangOpts,
3003 const char *&PrevSpec, unsigned &DiagID,
3004 bool &isInvalid) {
3005 assert(!LangOpts.FixedPoint);
3006 DiagID = diag::err_fixed_point_not_enabled;
3007 PrevSpec = ""; // Not used by diagnostic
3008 isInvalid = true;
3009 }
3010
3011 /// ParseDeclarationSpecifiers
3012 /// declaration-specifiers: [C99 6.7]
3013 /// storage-class-specifier declaration-specifiers[opt]
3014 /// type-specifier declaration-specifiers[opt]
3015 /// [C99] function-specifier declaration-specifiers[opt]
3016 /// [C11] alignment-specifier declaration-specifiers[opt]
3017 /// [GNU] attributes declaration-specifiers[opt]
3018 /// [Clang] '__module_private__' declaration-specifiers[opt]
3019 /// [ObjC1] '__kindof' declaration-specifiers[opt]
3020 ///
3021 /// storage-class-specifier: [C99 6.7.1]
3022 /// 'typedef'
3023 /// 'extern'
3024 /// 'static'
3025 /// 'auto'
3026 /// 'register'
3027 /// [C++] 'mutable'
3028 /// [C++11] 'thread_local'
3029 /// [C11] '_Thread_local'
3030 /// [GNU] '__thread'
3031 /// function-specifier: [C99 6.7.4]
3032 /// [C99] 'inline'
3033 /// [C++] 'virtual'
3034 /// [C++] 'explicit'
3035 /// [OpenCL] '__kernel'
3036 /// 'friend': [C++ dcl.friend]
3037 /// 'constexpr': [C++0x dcl.constexpr]
ParseDeclarationSpecifiers(DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSContext,LateParsedAttrList * LateAttrs)3038 void Parser::ParseDeclarationSpecifiers(DeclSpec &DS,
3039 const ParsedTemplateInfo &TemplateInfo,
3040 AccessSpecifier AS,
3041 DeclSpecContext DSContext,
3042 LateParsedAttrList *LateAttrs) {
3043 if (DS.getSourceRange().isInvalid()) {
3044 // Start the range at the current token but make the end of the range
3045 // invalid. This will make the entire range invalid unless we successfully
3046 // consume a token.
3047 DS.SetRangeStart(Tok.getLocation());
3048 DS.SetRangeEnd(SourceLocation());
3049 }
3050
3051 bool EnteringContext = (DSContext == DeclSpecContext::DSC_class ||
3052 DSContext == DeclSpecContext::DSC_top_level);
3053 bool AttrsLastTime = false;
3054 ParsedAttributesWithRange attrs(AttrFactory);
3055 // We use Sema's policy to get bool macros right.
3056 PrintingPolicy Policy = Actions.getPrintingPolicy();
3057 while (1) {
3058 bool isInvalid = false;
3059 bool isStorageClass = false;
3060 const char *PrevSpec = nullptr;
3061 unsigned DiagID = 0;
3062
3063 // This value needs to be set to the location of the last token if the last
3064 // token of the specifier is already consumed.
3065 SourceLocation ConsumedEnd;
3066
3067 // HACK: MSVC doesn't consider _Atomic to be a keyword and its STL
3068 // implementation for VS2013 uses _Atomic as an identifier for one of the
3069 // classes in <atomic>.
3070 //
3071 // A typedef declaration containing _Atomic<...> is among the places where
3072 // the class is used. If we are currently parsing such a declaration, treat
3073 // the token as an identifier.
3074 if (getLangOpts().MSVCCompat && Tok.is(tok::kw__Atomic) &&
3075 DS.getStorageClassSpec() == clang::DeclSpec::SCS_typedef &&
3076 !DS.hasTypeSpecifier() && GetLookAheadToken(1).is(tok::less))
3077 Tok.setKind(tok::identifier);
3078
3079 SourceLocation Loc = Tok.getLocation();
3080
3081 // Helper for image types in OpenCL.
3082 auto handleOpenCLImageKW = [&] (StringRef Ext, TypeSpecifierType ImageTypeSpec) {
3083 // Check if the image type is supported and otherwise turn the keyword into an identifier
3084 // because image types from extensions are not reserved identifiers.
3085 if (!StringRef(Ext).empty() && !getActions().getOpenCLOptions().isSupported(Ext, getLangOpts())) {
3086 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
3087 Tok.setKind(tok::identifier);
3088 return false;
3089 }
3090 isInvalid = DS.SetTypeSpecType(ImageTypeSpec, Loc, PrevSpec, DiagID, Policy);
3091 return true;
3092 };
3093
3094 switch (Tok.getKind()) {
3095 default:
3096 DoneWithDeclSpec:
3097 if (!AttrsLastTime)
3098 ProhibitAttributes(attrs);
3099 else {
3100 // Reject C++11 attributes that appertain to decl specifiers as
3101 // we don't support any C++11 attributes that appertain to decl
3102 // specifiers. This also conforms to what g++ 4.8 is doing.
3103 ProhibitCXX11Attributes(attrs, diag::err_attribute_not_type_attr);
3104
3105 DS.takeAttributesFrom(attrs);
3106 }
3107
3108 // If this is not a declaration specifier token, we're done reading decl
3109 // specifiers. First verify that DeclSpec's are consistent.
3110 DS.Finish(Actions, Policy);
3111 return;
3112
3113 case tok::l_square:
3114 case tok::kw_alignas:
3115 if (!standardAttributesAllowed() || !isCXX11AttributeSpecifier())
3116 goto DoneWithDeclSpec;
3117
3118 ProhibitAttributes(attrs);
3119 // FIXME: It would be good to recover by accepting the attributes,
3120 // but attempting to do that now would cause serious
3121 // madness in terms of diagnostics.
3122 attrs.clear();
3123 attrs.Range = SourceRange();
3124
3125 ParseCXX11Attributes(attrs);
3126 AttrsLastTime = true;
3127 continue;
3128
3129 case tok::code_completion: {
3130 Sema::ParserCompletionContext CCC = Sema::PCC_Namespace;
3131 if (DS.hasTypeSpecifier()) {
3132 bool AllowNonIdentifiers
3133 = (getCurScope()->getFlags() & (Scope::ControlScope |
3134 Scope::BlockScope |
3135 Scope::TemplateParamScope |
3136 Scope::FunctionPrototypeScope |
3137 Scope::AtCatchScope)) == 0;
3138 bool AllowNestedNameSpecifiers
3139 = DSContext == DeclSpecContext::DSC_top_level ||
3140 (DSContext == DeclSpecContext::DSC_class && DS.isFriendSpecified());
3141
3142 cutOffParsing();
3143 Actions.CodeCompleteDeclSpec(getCurScope(), DS,
3144 AllowNonIdentifiers,
3145 AllowNestedNameSpecifiers);
3146 return;
3147 }
3148
3149 if (getCurScope()->getFnParent() || getCurScope()->getBlockParent())
3150 CCC = Sema::PCC_LocalDeclarationSpecifiers;
3151 else if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate)
3152 CCC = DSContext == DeclSpecContext::DSC_class ? Sema::PCC_MemberTemplate
3153 : Sema::PCC_Template;
3154 else if (DSContext == DeclSpecContext::DSC_class)
3155 CCC = Sema::PCC_Class;
3156 else if (CurParsedObjCImpl)
3157 CCC = Sema::PCC_ObjCImplementation;
3158
3159 cutOffParsing();
3160 Actions.CodeCompleteOrdinaryName(getCurScope(), CCC);
3161 return;
3162 }
3163
3164 case tok::coloncolon: // ::foo::bar
3165 // C++ scope specifier. Annotate and loop, or bail out on error.
3166 if (TryAnnotateCXXScopeToken(EnteringContext)) {
3167 if (!DS.hasTypeSpecifier())
3168 DS.SetTypeSpecError();
3169 goto DoneWithDeclSpec;
3170 }
3171 if (Tok.is(tok::coloncolon)) // ::new or ::delete
3172 goto DoneWithDeclSpec;
3173 continue;
3174
3175 case tok::annot_cxxscope: {
3176 if (DS.hasTypeSpecifier() || DS.isTypeAltiVecVector())
3177 goto DoneWithDeclSpec;
3178
3179 CXXScopeSpec SS;
3180 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(),
3181 Tok.getAnnotationRange(),
3182 SS);
3183
3184 // We are looking for a qualified typename.
3185 Token Next = NextToken();
3186
3187 TemplateIdAnnotation *TemplateId = Next.is(tok::annot_template_id)
3188 ? takeTemplateIdAnnotation(Next)
3189 : nullptr;
3190 if (TemplateId && TemplateId->hasInvalidName()) {
3191 // We found something like 'T::U<Args> x', but U is not a template.
3192 // Assume it was supposed to be a type.
3193 DS.SetTypeSpecError();
3194 ConsumeAnnotationToken();
3195 break;
3196 }
3197
3198 if (TemplateId && TemplateId->Kind == TNK_Type_template) {
3199 // We have a qualified template-id, e.g., N::A<int>
3200
3201 // If this would be a valid constructor declaration with template
3202 // arguments, we will reject the attempt to form an invalid type-id
3203 // referring to the injected-class-name when we annotate the token,
3204 // per C++ [class.qual]p2.
3205 //
3206 // To improve diagnostics for this case, parse the declaration as a
3207 // constructor (and reject the extra template arguments later).
3208 if ((DSContext == DeclSpecContext::DSC_top_level ||
3209 DSContext == DeclSpecContext::DSC_class) &&
3210 TemplateId->Name &&
3211 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS) &&
3212 isConstructorDeclarator(/*Unqualified=*/false)) {
3213 // The user meant this to be an out-of-line constructor
3214 // definition, but template arguments are not allowed
3215 // there. Just allow this as a constructor; we'll
3216 // complain about it later.
3217 goto DoneWithDeclSpec;
3218 }
3219
3220 DS.getTypeSpecScope() = SS;
3221 ConsumeAnnotationToken(); // The C++ scope.
3222 assert(Tok.is(tok::annot_template_id) &&
3223 "ParseOptionalCXXScopeSpecifier not working");
3224 AnnotateTemplateIdTokenAsType(SS);
3225 continue;
3226 }
3227
3228 if (TemplateId && TemplateId->Kind == TNK_Concept_template &&
3229 GetLookAheadToken(2).isOneOf(tok::kw_auto, tok::kw_decltype)) {
3230 DS.getTypeSpecScope() = SS;
3231 // This is a qualified placeholder-specifier, e.g., ::C<int> auto ...
3232 // Consume the scope annotation and continue to consume the template-id
3233 // as a placeholder-specifier.
3234 ConsumeAnnotationToken();
3235 continue;
3236 }
3237
3238 if (Next.is(tok::annot_typename)) {
3239 DS.getTypeSpecScope() = SS;
3240 ConsumeAnnotationToken(); // The C++ scope.
3241 TypeResult T = getTypeAnnotation(Tok);
3242 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename,
3243 Tok.getAnnotationEndLoc(),
3244 PrevSpec, DiagID, T, Policy);
3245 if (isInvalid)
3246 break;
3247 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3248 ConsumeAnnotationToken(); // The typename
3249 }
3250
3251 if (Next.isNot(tok::identifier))
3252 goto DoneWithDeclSpec;
3253
3254 // Check whether this is a constructor declaration. If we're in a
3255 // context where the identifier could be a class name, and it has the
3256 // shape of a constructor declaration, process it as one.
3257 if ((DSContext == DeclSpecContext::DSC_top_level ||
3258 DSContext == DeclSpecContext::DSC_class) &&
3259 Actions.isCurrentClassName(*Next.getIdentifierInfo(), getCurScope(),
3260 &SS) &&
3261 isConstructorDeclarator(/*Unqualified*/ false))
3262 goto DoneWithDeclSpec;
3263
3264 ParsedType TypeRep =
3265 Actions.getTypeName(*Next.getIdentifierInfo(), Next.getLocation(),
3266 getCurScope(), &SS, false, false, nullptr,
3267 /*IsCtorOrDtorName=*/false,
3268 /*WantNontrivialTypeSourceInfo=*/true,
3269 isClassTemplateDeductionContext(DSContext));
3270
3271 // If the referenced identifier is not a type, then this declspec is
3272 // erroneous: We already checked about that it has no type specifier, and
3273 // C++ doesn't have implicit int. Diagnose it as a typo w.r.t. to the
3274 // typename.
3275 if (!TypeRep) {
3276 if (TryAnnotateTypeConstraint())
3277 goto DoneWithDeclSpec;
3278 if (Tok.isNot(tok::annot_cxxscope) ||
3279 NextToken().isNot(tok::identifier))
3280 continue;
3281 // Eat the scope spec so the identifier is current.
3282 ConsumeAnnotationToken();
3283 ParsedAttributesWithRange Attrs(AttrFactory);
3284 if (ParseImplicitInt(DS, &SS, TemplateInfo, AS, DSContext, Attrs)) {
3285 if (!Attrs.empty()) {
3286 AttrsLastTime = true;
3287 attrs.takeAllFrom(Attrs);
3288 }
3289 continue;
3290 }
3291 goto DoneWithDeclSpec;
3292 }
3293
3294 DS.getTypeSpecScope() = SS;
3295 ConsumeAnnotationToken(); // The C++ scope.
3296
3297 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3298 DiagID, TypeRep, Policy);
3299 if (isInvalid)
3300 break;
3301
3302 DS.SetRangeEnd(Tok.getLocation());
3303 ConsumeToken(); // The typename.
3304
3305 continue;
3306 }
3307
3308 case tok::annot_typename: {
3309 // If we've previously seen a tag definition, we were almost surely
3310 // missing a semicolon after it.
3311 if (DS.hasTypeSpecifier() && DS.hasTagDefinition())
3312 goto DoneWithDeclSpec;
3313
3314 TypeResult T = getTypeAnnotation(Tok);
3315 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3316 DiagID, T, Policy);
3317 if (isInvalid)
3318 break;
3319
3320 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
3321 ConsumeAnnotationToken(); // The typename
3322
3323 continue;
3324 }
3325
3326 case tok::kw___is_signed:
3327 // GNU libstdc++ 4.4 uses __is_signed as an identifier, but Clang
3328 // typically treats it as a trait. If we see __is_signed as it appears
3329 // in libstdc++, e.g.,
3330 //
3331 // static const bool __is_signed;
3332 //
3333 // then treat __is_signed as an identifier rather than as a keyword.
3334 if (DS.getTypeSpecType() == TST_bool &&
3335 DS.getTypeQualifiers() == DeclSpec::TQ_const &&
3336 DS.getStorageClassSpec() == DeclSpec::SCS_static)
3337 TryKeywordIdentFallback(true);
3338
3339 // We're done with the declaration-specifiers.
3340 goto DoneWithDeclSpec;
3341
3342 // typedef-name
3343 case tok::kw___super:
3344 case tok::kw_decltype:
3345 case tok::identifier: {
3346 // This identifier can only be a typedef name if we haven't already seen
3347 // a type-specifier. Without this check we misparse:
3348 // typedef int X; struct Y { short X; }; as 'short int'.
3349 if (DS.hasTypeSpecifier())
3350 goto DoneWithDeclSpec;
3351
3352 // If the token is an identifier named "__declspec" and Microsoft
3353 // extensions are not enabled, it is likely that there will be cascading
3354 // parse errors if this really is a __declspec attribute. Attempt to
3355 // recognize that scenario and recover gracefully.
3356 if (!getLangOpts().DeclSpecKeyword && Tok.is(tok::identifier) &&
3357 Tok.getIdentifierInfo()->getName().equals("__declspec")) {
3358 Diag(Loc, diag::err_ms_attributes_not_enabled);
3359
3360 // The next token should be an open paren. If it is, eat the entire
3361 // attribute declaration and continue.
3362 if (NextToken().is(tok::l_paren)) {
3363 // Consume the __declspec identifier.
3364 ConsumeToken();
3365
3366 // Eat the parens and everything between them.
3367 BalancedDelimiterTracker T(*this, tok::l_paren);
3368 if (T.consumeOpen()) {
3369 assert(false && "Not a left paren?");
3370 return;
3371 }
3372 T.skipToEnd();
3373 continue;
3374 }
3375 }
3376
3377 // In C++, check to see if this is a scope specifier like foo::bar::, if
3378 // so handle it as such. This is important for ctor parsing.
3379 if (getLangOpts().CPlusPlus) {
3380 if (TryAnnotateCXXScopeToken(EnteringContext)) {
3381 DS.SetTypeSpecError();
3382 goto DoneWithDeclSpec;
3383 }
3384 if (!Tok.is(tok::identifier))
3385 continue;
3386 }
3387
3388 // Check for need to substitute AltiVec keyword tokens.
3389 if (TryAltiVecToken(DS, Loc, PrevSpec, DiagID, isInvalid))
3390 break;
3391
3392 // [AltiVec] 2.2: [If the 'vector' specifier is used] The syntax does not
3393 // allow the use of a typedef name as a type specifier.
3394 if (DS.isTypeAltiVecVector())
3395 goto DoneWithDeclSpec;
3396
3397 if (DSContext == DeclSpecContext::DSC_objc_method_result &&
3398 isObjCInstancetype()) {
3399 ParsedType TypeRep = Actions.ActOnObjCInstanceType(Loc);
3400 assert(TypeRep);
3401 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3402 DiagID, TypeRep, Policy);
3403 if (isInvalid)
3404 break;
3405
3406 DS.SetRangeEnd(Loc);
3407 ConsumeToken();
3408 continue;
3409 }
3410
3411 // If we're in a context where the identifier could be a class name,
3412 // check whether this is a constructor declaration.
3413 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
3414 Actions.isCurrentClassName(*Tok.getIdentifierInfo(), getCurScope()) &&
3415 isConstructorDeclarator(/*Unqualified*/true))
3416 goto DoneWithDeclSpec;
3417
3418 ParsedType TypeRep = Actions.getTypeName(
3419 *Tok.getIdentifierInfo(), Tok.getLocation(), getCurScope(), nullptr,
3420 false, false, nullptr, false, false,
3421 isClassTemplateDeductionContext(DSContext));
3422
3423 // If this is not a typedef name, don't parse it as part of the declspec,
3424 // it must be an implicit int or an error.
3425 if (!TypeRep) {
3426 if (TryAnnotateTypeConstraint())
3427 goto DoneWithDeclSpec;
3428 if (Tok.isNot(tok::identifier))
3429 continue;
3430 ParsedAttributesWithRange Attrs(AttrFactory);
3431 if (ParseImplicitInt(DS, nullptr, TemplateInfo, AS, DSContext, Attrs)) {
3432 if (!Attrs.empty()) {
3433 AttrsLastTime = true;
3434 attrs.takeAllFrom(Attrs);
3435 }
3436 continue;
3437 }
3438 goto DoneWithDeclSpec;
3439 }
3440
3441 // Likewise, if this is a context where the identifier could be a template
3442 // name, check whether this is a deduction guide declaration.
3443 if (getLangOpts().CPlusPlus17 &&
3444 (DSContext == DeclSpecContext::DSC_class ||
3445 DSContext == DeclSpecContext::DSC_top_level) &&
3446 Actions.isDeductionGuideName(getCurScope(), *Tok.getIdentifierInfo(),
3447 Tok.getLocation()) &&
3448 isConstructorDeclarator(/*Unqualified*/ true,
3449 /*DeductionGuide*/ true))
3450 goto DoneWithDeclSpec;
3451
3452 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec,
3453 DiagID, TypeRep, Policy);
3454 if (isInvalid)
3455 break;
3456
3457 DS.SetRangeEnd(Tok.getLocation());
3458 ConsumeToken(); // The identifier
3459
3460 // Objective-C supports type arguments and protocol references
3461 // following an Objective-C object or object pointer
3462 // type. Handle either one of them.
3463 if (Tok.is(tok::less) && getLangOpts().ObjC) {
3464 SourceLocation NewEndLoc;
3465 TypeResult NewTypeRep = parseObjCTypeArgsAndProtocolQualifiers(
3466 Loc, TypeRep, /*consumeLastToken=*/true,
3467 NewEndLoc);
3468 if (NewTypeRep.isUsable()) {
3469 DS.UpdateTypeRep(NewTypeRep.get());
3470 DS.SetRangeEnd(NewEndLoc);
3471 }
3472 }
3473
3474 // Need to support trailing type qualifiers (e.g. "id<p> const").
3475 // If a type specifier follows, it will be diagnosed elsewhere.
3476 continue;
3477 }
3478
3479 // type-name or placeholder-specifier
3480 case tok::annot_template_id: {
3481 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
3482
3483 if (TemplateId->hasInvalidName()) {
3484 DS.SetTypeSpecError();
3485 break;
3486 }
3487
3488 if (TemplateId->Kind == TNK_Concept_template) {
3489 // If we've already diagnosed that this type-constraint has invalid
3490 // arguemnts, drop it and just form 'auto' or 'decltype(auto)'.
3491 if (TemplateId->hasInvalidArgs())
3492 TemplateId = nullptr;
3493
3494 if (NextToken().is(tok::identifier)) {
3495 Diag(Loc, diag::err_placeholder_expected_auto_or_decltype_auto)
3496 << FixItHint::CreateInsertion(NextToken().getLocation(), "auto");
3497 // Attempt to continue as if 'auto' was placed here.
3498 isInvalid = DS.SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID,
3499 TemplateId, Policy);
3500 break;
3501 }
3502 if (!NextToken().isOneOf(tok::kw_auto, tok::kw_decltype))
3503 goto DoneWithDeclSpec;
3504 ConsumeAnnotationToken();
3505 SourceLocation AutoLoc = Tok.getLocation();
3506 if (TryConsumeToken(tok::kw_decltype)) {
3507 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
3508 if (Tracker.consumeOpen()) {
3509 // Something like `void foo(Iterator decltype i)`
3510 Diag(Tok, diag::err_expected) << tok::l_paren;
3511 } else {
3512 if (!TryConsumeToken(tok::kw_auto)) {
3513 // Something like `void foo(Iterator decltype(int) i)`
3514 Tracker.skipToEnd();
3515 Diag(Tok, diag::err_placeholder_expected_auto_or_decltype_auto)
3516 << FixItHint::CreateReplacement(SourceRange(AutoLoc,
3517 Tok.getLocation()),
3518 "auto");
3519 } else {
3520 Tracker.consumeClose();
3521 }
3522 }
3523 ConsumedEnd = Tok.getLocation();
3524 // Even if something went wrong above, continue as if we've seen
3525 // `decltype(auto)`.
3526 isInvalid = DS.SetTypeSpecType(TST_decltype_auto, Loc, PrevSpec,
3527 DiagID, TemplateId, Policy);
3528 } else {
3529 isInvalid = DS.SetTypeSpecType(TST_auto, Loc, PrevSpec, DiagID,
3530 TemplateId, Policy);
3531 }
3532 break;
3533 }
3534
3535 if (TemplateId->Kind != TNK_Type_template &&
3536 TemplateId->Kind != TNK_Undeclared_template) {
3537 // This template-id does not refer to a type name, so we're
3538 // done with the type-specifiers.
3539 goto DoneWithDeclSpec;
3540 }
3541
3542 // If we're in a context where the template-id could be a
3543 // constructor name or specialization, check whether this is a
3544 // constructor declaration.
3545 if (getLangOpts().CPlusPlus && DSContext == DeclSpecContext::DSC_class &&
3546 Actions.isCurrentClassName(*TemplateId->Name, getCurScope()) &&
3547 isConstructorDeclarator(/*Unqualified=*/true))
3548 goto DoneWithDeclSpec;
3549
3550 // Turn the template-id annotation token into a type annotation
3551 // token, then try again to parse it as a type-specifier.
3552 CXXScopeSpec SS;
3553 AnnotateTemplateIdTokenAsType(SS);
3554 continue;
3555 }
3556
3557 // Attributes support.
3558 case tok::kw___attribute:
3559 case tok::kw___declspec:
3560 ParseAttributes(PAKM_GNU | PAKM_Declspec, DS.getAttributes(), nullptr,
3561 LateAttrs);
3562 continue;
3563
3564 // Microsoft single token adornments.
3565 case tok::kw___forceinline: {
3566 isInvalid = DS.setFunctionSpecForceInline(Loc, PrevSpec, DiagID);
3567 IdentifierInfo *AttrName = Tok.getIdentifierInfo();
3568 SourceLocation AttrNameLoc = Tok.getLocation();
3569 DS.getAttributes().addNew(AttrName, AttrNameLoc, nullptr, AttrNameLoc,
3570 nullptr, 0, ParsedAttr::AS_Keyword);
3571 break;
3572 }
3573
3574 case tok::kw___unaligned:
3575 isInvalid = DS.SetTypeQual(DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
3576 getLangOpts());
3577 break;
3578
3579 case tok::kw___sptr:
3580 case tok::kw___uptr:
3581 case tok::kw___ptr64:
3582 case tok::kw___ptr32:
3583 case tok::kw___w64:
3584 case tok::kw___cdecl:
3585 case tok::kw___stdcall:
3586 case tok::kw___fastcall:
3587 case tok::kw___thiscall:
3588 case tok::kw___regcall:
3589 case tok::kw___vectorcall:
3590 ParseMicrosoftTypeAttributes(DS.getAttributes());
3591 continue;
3592
3593 // Borland single token adornments.
3594 case tok::kw___pascal:
3595 ParseBorlandTypeAttributes(DS.getAttributes());
3596 continue;
3597
3598 // OpenCL single token adornments.
3599 case tok::kw___kernel:
3600 ParseOpenCLKernelAttributes(DS.getAttributes());
3601 continue;
3602
3603 // Nullability type specifiers.
3604 case tok::kw__Nonnull:
3605 case tok::kw__Nullable:
3606 case tok::kw__Nullable_result:
3607 case tok::kw__Null_unspecified:
3608 ParseNullabilityTypeSpecifiers(DS.getAttributes());
3609 continue;
3610
3611 // Objective-C 'kindof' types.
3612 case tok::kw___kindof:
3613 DS.getAttributes().addNew(Tok.getIdentifierInfo(), Loc, nullptr, Loc,
3614 nullptr, 0, ParsedAttr::AS_Keyword);
3615 (void)ConsumeToken();
3616 continue;
3617
3618 // storage-class-specifier
3619 case tok::kw_typedef:
3620 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_typedef, Loc,
3621 PrevSpec, DiagID, Policy);
3622 isStorageClass = true;
3623 break;
3624 case tok::kw_extern:
3625 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
3626 Diag(Tok, diag::ext_thread_before) << "extern";
3627 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_extern, Loc,
3628 PrevSpec, DiagID, Policy);
3629 isStorageClass = true;
3630 break;
3631 case tok::kw___private_extern__:
3632 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_private_extern,
3633 Loc, PrevSpec, DiagID, Policy);
3634 isStorageClass = true;
3635 break;
3636 case tok::kw_static:
3637 if (DS.getThreadStorageClassSpec() == DeclSpec::TSCS___thread)
3638 Diag(Tok, diag::ext_thread_before) << "static";
3639 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_static, Loc,
3640 PrevSpec, DiagID, Policy);
3641 isStorageClass = true;
3642 break;
3643 case tok::kw_auto:
3644 if (getLangOpts().CPlusPlus11) {
3645 if (isKnownToBeTypeSpecifier(GetLookAheadToken(1))) {
3646 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc,
3647 PrevSpec, DiagID, Policy);
3648 if (!isInvalid)
3649 Diag(Tok, diag::ext_auto_storage_class)
3650 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc());
3651 } else
3652 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto, Loc, PrevSpec,
3653 DiagID, Policy);
3654 } else
3655 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc,
3656 PrevSpec, DiagID, Policy);
3657 isStorageClass = true;
3658 break;
3659 case tok::kw___auto_type:
3660 Diag(Tok, diag::ext_auto_type);
3661 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_auto_type, Loc, PrevSpec,
3662 DiagID, Policy);
3663 break;
3664 case tok::kw_register:
3665 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_register, Loc,
3666 PrevSpec, DiagID, Policy);
3667 isStorageClass = true;
3668 break;
3669 case tok::kw_mutable:
3670 isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_mutable, Loc,
3671 PrevSpec, DiagID, Policy);
3672 isStorageClass = true;
3673 break;
3674 case tok::kw___thread:
3675 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS___thread, Loc,
3676 PrevSpec, DiagID);
3677 isStorageClass = true;
3678 break;
3679 case tok::kw_thread_local:
3680 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS_thread_local, Loc,
3681 PrevSpec, DiagID);
3682 isStorageClass = true;
3683 break;
3684 case tok::kw__Thread_local:
3685 if (!getLangOpts().C11)
3686 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3687 isInvalid = DS.SetStorageClassSpecThread(DeclSpec::TSCS__Thread_local,
3688 Loc, PrevSpec, DiagID);
3689 isStorageClass = true;
3690 break;
3691
3692 // function-specifier
3693 case tok::kw_inline:
3694 isInvalid = DS.setFunctionSpecInline(Loc, PrevSpec, DiagID);
3695 break;
3696 case tok::kw_virtual:
3697 // C++ for OpenCL does not allow virtual function qualifier, to avoid
3698 // function pointers restricted in OpenCL v2.0 s6.9.a.
3699 if (getLangOpts().OpenCLCPlusPlus &&
3700 !getActions().getOpenCLOptions().isAvailableOption(
3701 "__cl_clang_function_pointers", getLangOpts())) {
3702 DiagID = diag::err_openclcxx_virtual_function;
3703 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
3704 isInvalid = true;
3705 } else {
3706 isInvalid = DS.setFunctionSpecVirtual(Loc, PrevSpec, DiagID);
3707 }
3708 break;
3709 case tok::kw_explicit: {
3710 SourceLocation ExplicitLoc = Loc;
3711 SourceLocation CloseParenLoc;
3712 ExplicitSpecifier ExplicitSpec(nullptr, ExplicitSpecKind::ResolvedTrue);
3713 ConsumedEnd = ExplicitLoc;
3714 ConsumeToken(); // kw_explicit
3715 if (Tok.is(tok::l_paren)) {
3716 if (getLangOpts().CPlusPlus20 || isExplicitBool() == TPResult::True) {
3717 Diag(Tok.getLocation(), getLangOpts().CPlusPlus20
3718 ? diag::warn_cxx17_compat_explicit_bool
3719 : diag::ext_explicit_bool);
3720
3721 ExprResult ExplicitExpr(static_cast<Expr *>(nullptr));
3722 BalancedDelimiterTracker Tracker(*this, tok::l_paren);
3723 Tracker.consumeOpen();
3724 ExplicitExpr = ParseConstantExpression();
3725 ConsumedEnd = Tok.getLocation();
3726 if (ExplicitExpr.isUsable()) {
3727 CloseParenLoc = Tok.getLocation();
3728 Tracker.consumeClose();
3729 ExplicitSpec =
3730 Actions.ActOnExplicitBoolSpecifier(ExplicitExpr.get());
3731 } else
3732 Tracker.skipToEnd();
3733 } else {
3734 Diag(Tok.getLocation(), diag::warn_cxx20_compat_explicit_bool);
3735 }
3736 }
3737 isInvalid = DS.setFunctionSpecExplicit(ExplicitLoc, PrevSpec, DiagID,
3738 ExplicitSpec, CloseParenLoc);
3739 break;
3740 }
3741 case tok::kw__Noreturn:
3742 if (!getLangOpts().C11)
3743 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3744 isInvalid = DS.setFunctionSpecNoreturn(Loc, PrevSpec, DiagID);
3745 break;
3746
3747 // alignment-specifier
3748 case tok::kw__Alignas:
3749 if (!getLangOpts().C11)
3750 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
3751 ParseAlignmentSpecifier(DS.getAttributes());
3752 continue;
3753
3754 // friend
3755 case tok::kw_friend:
3756 if (DSContext == DeclSpecContext::DSC_class)
3757 isInvalid = DS.SetFriendSpec(Loc, PrevSpec, DiagID);
3758 else {
3759 PrevSpec = ""; // not actually used by the diagnostic
3760 DiagID = diag::err_friend_invalid_in_context;
3761 isInvalid = true;
3762 }
3763 break;
3764
3765 // Modules
3766 case tok::kw___module_private__:
3767 isInvalid = DS.setModulePrivateSpec(Loc, PrevSpec, DiagID);
3768 break;
3769
3770 // constexpr, consteval, constinit specifiers
3771 case tok::kw_constexpr:
3772 isInvalid = DS.SetConstexprSpec(ConstexprSpecKind::Constexpr, Loc,
3773 PrevSpec, DiagID);
3774 break;
3775 case tok::kw_consteval:
3776 isInvalid = DS.SetConstexprSpec(ConstexprSpecKind::Consteval, Loc,
3777 PrevSpec, DiagID);
3778 break;
3779 case tok::kw_constinit:
3780 isInvalid = DS.SetConstexprSpec(ConstexprSpecKind::Constinit, Loc,
3781 PrevSpec, DiagID);
3782 break;
3783
3784 // type-specifier
3785 case tok::kw_short:
3786 isInvalid = DS.SetTypeSpecWidth(TypeSpecifierWidth::Short, Loc, PrevSpec,
3787 DiagID, Policy);
3788 break;
3789 case tok::kw_long:
3790 if (DS.getTypeSpecWidth() != TypeSpecifierWidth::Long)
3791 isInvalid = DS.SetTypeSpecWidth(TypeSpecifierWidth::Long, Loc, PrevSpec,
3792 DiagID, Policy);
3793 else
3794 isInvalid = DS.SetTypeSpecWidth(TypeSpecifierWidth::LongLong, Loc,
3795 PrevSpec, DiagID, Policy);
3796 break;
3797 case tok::kw___int64:
3798 isInvalid = DS.SetTypeSpecWidth(TypeSpecifierWidth::LongLong, Loc,
3799 PrevSpec, DiagID, Policy);
3800 break;
3801 case tok::kw_signed:
3802 isInvalid =
3803 DS.SetTypeSpecSign(TypeSpecifierSign::Signed, Loc, PrevSpec, DiagID);
3804 break;
3805 case tok::kw_unsigned:
3806 isInvalid = DS.SetTypeSpecSign(TypeSpecifierSign::Unsigned, Loc, PrevSpec,
3807 DiagID);
3808 break;
3809 case tok::kw__Complex:
3810 if (!getLangOpts().C99)
3811 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3812 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_complex, Loc, PrevSpec,
3813 DiagID);
3814 break;
3815 case tok::kw__Imaginary:
3816 if (!getLangOpts().C99)
3817 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3818 isInvalid = DS.SetTypeSpecComplex(DeclSpec::TSC_imaginary, Loc, PrevSpec,
3819 DiagID);
3820 break;
3821 case tok::kw_void:
3822 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec,
3823 DiagID, Policy);
3824 break;
3825 case tok::kw_char:
3826 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec,
3827 DiagID, Policy);
3828 break;
3829 case tok::kw_int:
3830 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec,
3831 DiagID, Policy);
3832 break;
3833 case tok::kw__ExtInt: {
3834 ExprResult ER = ParseExtIntegerArgument();
3835 if (ER.isInvalid())
3836 continue;
3837 isInvalid = DS.SetExtIntType(Loc, ER.get(), PrevSpec, DiagID, Policy);
3838 ConsumedEnd = PrevTokLocation;
3839 break;
3840 }
3841 case tok::kw___int128:
3842 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec,
3843 DiagID, Policy);
3844 break;
3845 case tok::kw_half:
3846 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec,
3847 DiagID, Policy);
3848 break;
3849 case tok::kw___bf16:
3850 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_BFloat16, Loc, PrevSpec,
3851 DiagID, Policy);
3852 break;
3853 case tok::kw_float:
3854 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec,
3855 DiagID, Policy);
3856 break;
3857 case tok::kw_double:
3858 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec,
3859 DiagID, Policy);
3860 break;
3861 case tok::kw__Float16:
3862 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float16, Loc, PrevSpec,
3863 DiagID, Policy);
3864 break;
3865 case tok::kw__Accum:
3866 if (!getLangOpts().FixedPoint) {
3867 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3868 } else {
3869 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_accum, Loc, PrevSpec,
3870 DiagID, Policy);
3871 }
3872 break;
3873 case tok::kw__Fract:
3874 if (!getLangOpts().FixedPoint) {
3875 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3876 } else {
3877 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_fract, Loc, PrevSpec,
3878 DiagID, Policy);
3879 }
3880 break;
3881 case tok::kw__Sat:
3882 if (!getLangOpts().FixedPoint) {
3883 SetupFixedPointError(getLangOpts(), PrevSpec, DiagID, isInvalid);
3884 } else {
3885 isInvalid = DS.SetTypeSpecSat(Loc, PrevSpec, DiagID);
3886 }
3887 break;
3888 case tok::kw___float128:
3889 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_float128, Loc, PrevSpec,
3890 DiagID, Policy);
3891 break;
3892 case tok::kw_wchar_t:
3893 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec,
3894 DiagID, Policy);
3895 break;
3896 case tok::kw_char8_t:
3897 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char8, Loc, PrevSpec,
3898 DiagID, Policy);
3899 break;
3900 case tok::kw_char16_t:
3901 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec,
3902 DiagID, Policy);
3903 break;
3904 case tok::kw_char32_t:
3905 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec,
3906 DiagID, Policy);
3907 break;
3908 case tok::kw_bool:
3909 case tok::kw__Bool:
3910 if (Tok.is(tok::kw__Bool) && !getLangOpts().C99)
3911 Diag(Tok, diag::ext_c99_feature) << Tok.getName();
3912
3913 if (Tok.is(tok::kw_bool) &&
3914 DS.getTypeSpecType() != DeclSpec::TST_unspecified &&
3915 DS.getStorageClassSpec() == DeclSpec::SCS_typedef) {
3916 PrevSpec = ""; // Not used by the diagnostic.
3917 DiagID = diag::err_bool_redeclaration;
3918 // For better error recovery.
3919 Tok.setKind(tok::identifier);
3920 isInvalid = true;
3921 } else {
3922 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec,
3923 DiagID, Policy);
3924 }
3925 break;
3926 case tok::kw__Decimal32:
3927 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal32, Loc, PrevSpec,
3928 DiagID, Policy);
3929 break;
3930 case tok::kw__Decimal64:
3931 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal64, Loc, PrevSpec,
3932 DiagID, Policy);
3933 break;
3934 case tok::kw__Decimal128:
3935 isInvalid = DS.SetTypeSpecType(DeclSpec::TST_decimal128, Loc, PrevSpec,
3936 DiagID, Policy);
3937 break;
3938 case tok::kw___vector:
3939 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy);
3940 break;
3941 case tok::kw___pixel:
3942 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy);
3943 break;
3944 case tok::kw___bool:
3945 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy);
3946 break;
3947 case tok::kw_pipe:
3948 if (!getLangOpts().OpenCL || (getLangOpts().OpenCLVersion < 200 &&
3949 !getLangOpts().OpenCLCPlusPlus)) {
3950 // OpenCL 2.0 and later define this keyword. OpenCL 1.2 and earlier
3951 // should support the "pipe" word as identifier.
3952 Tok.getIdentifierInfo()->revertTokenIDToIdentifier();
3953 Tok.setKind(tok::identifier);
3954 goto DoneWithDeclSpec;
3955 } else if (!getLangOpts().OpenCLPipes) {
3956 DiagID = diag::err_opencl_unknown_type_specifier;
3957 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
3958 isInvalid = true;
3959 } else
3960 isInvalid = DS.SetTypePipe(true, Loc, PrevSpec, DiagID, Policy);
3961 break;
3962 // We only need to enumerate each image type once.
3963 #define IMAGE_READ_WRITE_TYPE(Type, Id, Ext)
3964 #define IMAGE_WRITE_TYPE(Type, Id, Ext)
3965 #define IMAGE_READ_TYPE(ImgType, Id, Ext) \
3966 case tok::kw_##ImgType##_t: \
3967 if (!handleOpenCLImageKW(Ext, DeclSpec::TST_##ImgType##_t)) \
3968 goto DoneWithDeclSpec; \
3969 break;
3970 #include "clang/Basic/OpenCLImageTypes.def"
3971 case tok::kw___unknown_anytype:
3972 isInvalid = DS.SetTypeSpecType(TST_unknown_anytype, Loc,
3973 PrevSpec, DiagID, Policy);
3974 break;
3975
3976 // class-specifier:
3977 case tok::kw_class:
3978 case tok::kw_struct:
3979 case tok::kw___interface:
3980 case tok::kw_union: {
3981 tok::TokenKind Kind = Tok.getKind();
3982 ConsumeToken();
3983
3984 // These are attributes following class specifiers.
3985 // To produce better diagnostic, we parse them when
3986 // parsing class specifier.
3987 ParsedAttributesWithRange Attributes(AttrFactory);
3988 ParseClassSpecifier(Kind, Loc, DS, TemplateInfo, AS,
3989 EnteringContext, DSContext, Attributes);
3990
3991 // If there are attributes following class specifier,
3992 // take them over and handle them here.
3993 if (!Attributes.empty()) {
3994 AttrsLastTime = true;
3995 attrs.takeAllFrom(Attributes);
3996 }
3997 continue;
3998 }
3999
4000 // enum-specifier:
4001 case tok::kw_enum:
4002 ConsumeToken();
4003 ParseEnumSpecifier(Loc, DS, TemplateInfo, AS, DSContext);
4004 continue;
4005
4006 // cv-qualifier:
4007 case tok::kw_const:
4008 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const, Loc, PrevSpec, DiagID,
4009 getLangOpts());
4010 break;
4011 case tok::kw_volatile:
4012 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
4013 getLangOpts());
4014 break;
4015 case tok::kw_restrict:
4016 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
4017 getLangOpts());
4018 break;
4019
4020 // C++ typename-specifier:
4021 case tok::kw_typename:
4022 if (TryAnnotateTypeOrScopeToken()) {
4023 DS.SetTypeSpecError();
4024 goto DoneWithDeclSpec;
4025 }
4026 if (!Tok.is(tok::kw_typename))
4027 continue;
4028 break;
4029
4030 // GNU typeof support.
4031 case tok::kw_typeof:
4032 ParseTypeofSpecifier(DS);
4033 continue;
4034
4035 case tok::annot_decltype:
4036 ParseDecltypeSpecifier(DS);
4037 continue;
4038
4039 case tok::annot_pragma_pack:
4040 HandlePragmaPack();
4041 continue;
4042
4043 case tok::annot_pragma_ms_pragma:
4044 HandlePragmaMSPragma();
4045 continue;
4046
4047 case tok::annot_pragma_ms_vtordisp:
4048 HandlePragmaMSVtorDisp();
4049 continue;
4050
4051 case tok::annot_pragma_ms_pointers_to_members:
4052 HandlePragmaMSPointersToMembers();
4053 continue;
4054
4055 case tok::kw___underlying_type:
4056 ParseUnderlyingTypeSpecifier(DS);
4057 continue;
4058
4059 case tok::kw__Atomic:
4060 // C11 6.7.2.4/4:
4061 // If the _Atomic keyword is immediately followed by a left parenthesis,
4062 // it is interpreted as a type specifier (with a type name), not as a
4063 // type qualifier.
4064 if (!getLangOpts().C11)
4065 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
4066
4067 if (NextToken().is(tok::l_paren)) {
4068 ParseAtomicSpecifier(DS);
4069 continue;
4070 }
4071 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
4072 getLangOpts());
4073 break;
4074
4075 // OpenCL address space qualifiers:
4076 case tok::kw___generic:
4077 // generic address space is introduced only in OpenCL v2.0
4078 // see OpenCL C Spec v2.0 s6.5.5
4079 // OpenCL v3.0 introduces __opencl_c_generic_address_space
4080 // feature macro to indicate if generic address space is supported
4081 if (!Actions.getLangOpts().OpenCLGenericAddressSpace) {
4082 DiagID = diag::err_opencl_unknown_type_specifier;
4083 PrevSpec = Tok.getIdentifierInfo()->getNameStart();
4084 isInvalid = true;
4085 break;
4086 }
4087 LLVM_FALLTHROUGH;
4088 case tok::kw_private:
4089 // It's fine (but redundant) to check this for __generic on the
4090 // fallthrough path; we only form the __generic token in OpenCL mode.
4091 if (!getLangOpts().OpenCL)
4092 goto DoneWithDeclSpec;
4093 LLVM_FALLTHROUGH;
4094 case tok::kw___private:
4095 case tok::kw___global:
4096 case tok::kw___local:
4097 case tok::kw___constant:
4098 // OpenCL access qualifiers:
4099 case tok::kw___read_only:
4100 case tok::kw___write_only:
4101 case tok::kw___read_write:
4102 ParseOpenCLQualifiers(DS.getAttributes());
4103 break;
4104
4105 case tok::less:
4106 // GCC ObjC supports types like "<SomeProtocol>" as a synonym for
4107 // "id<SomeProtocol>". This is hopelessly old fashioned and dangerous,
4108 // but we support it.
4109 if (DS.hasTypeSpecifier() || !getLangOpts().ObjC)
4110 goto DoneWithDeclSpec;
4111
4112 SourceLocation StartLoc = Tok.getLocation();
4113 SourceLocation EndLoc;
4114 TypeResult Type = parseObjCProtocolQualifierType(EndLoc);
4115 if (Type.isUsable()) {
4116 if (DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc, StartLoc,
4117 PrevSpec, DiagID, Type.get(),
4118 Actions.getASTContext().getPrintingPolicy()))
4119 Diag(StartLoc, DiagID) << PrevSpec;
4120
4121 DS.SetRangeEnd(EndLoc);
4122 } else {
4123 DS.SetTypeSpecError();
4124 }
4125
4126 // Need to support trailing type qualifiers (e.g. "id<p> const").
4127 // If a type specifier follows, it will be diagnosed elsewhere.
4128 continue;
4129 }
4130
4131 DS.SetRangeEnd(ConsumedEnd.isValid() ? ConsumedEnd : Tok.getLocation());
4132
4133 // If the specifier wasn't legal, issue a diagnostic.
4134 if (isInvalid) {
4135 assert(PrevSpec && "Method did not return previous specifier!");
4136 assert(DiagID);
4137
4138 if (DiagID == diag::ext_duplicate_declspec ||
4139 DiagID == diag::ext_warn_duplicate_declspec ||
4140 DiagID == diag::err_duplicate_declspec)
4141 Diag(Loc, DiagID) << PrevSpec
4142 << FixItHint::CreateRemoval(
4143 SourceRange(Loc, DS.getEndLoc()));
4144 else if (DiagID == diag::err_opencl_unknown_type_specifier) {
4145 Diag(Loc, DiagID) << getLangOpts().OpenCLCPlusPlus
4146 << getLangOpts().getOpenCLVersionTuple().getAsString()
4147 << PrevSpec << isStorageClass;
4148 } else
4149 Diag(Loc, DiagID) << PrevSpec;
4150 }
4151
4152 if (DiagID != diag::err_bool_redeclaration && ConsumedEnd.isInvalid())
4153 // After an error the next token can be an annotation token.
4154 ConsumeAnyToken();
4155
4156 AttrsLastTime = false;
4157 }
4158 }
4159
4160 /// ParseStructDeclaration - Parse a struct declaration without the terminating
4161 /// semicolon.
4162 ///
4163 /// Note that a struct declaration refers to a declaration in a struct,
4164 /// not to the declaration of a struct.
4165 ///
4166 /// struct-declaration:
4167 /// [C2x] attributes-specifier-seq[opt]
4168 /// specifier-qualifier-list struct-declarator-list
4169 /// [GNU] __extension__ struct-declaration
4170 /// [GNU] specifier-qualifier-list
4171 /// struct-declarator-list:
4172 /// struct-declarator
4173 /// struct-declarator-list ',' struct-declarator
4174 /// [GNU] struct-declarator-list ',' attributes[opt] struct-declarator
4175 /// struct-declarator:
4176 /// declarator
4177 /// [GNU] declarator attributes[opt]
4178 /// declarator[opt] ':' constant-expression
4179 /// [GNU] declarator[opt] ':' constant-expression attributes[opt]
4180 ///
ParseStructDeclaration(ParsingDeclSpec & DS,llvm::function_ref<void (ParsingFieldDeclarator &)> FieldsCallback)4181 void Parser::ParseStructDeclaration(
4182 ParsingDeclSpec &DS,
4183 llvm::function_ref<void(ParsingFieldDeclarator &)> FieldsCallback) {
4184
4185 if (Tok.is(tok::kw___extension__)) {
4186 // __extension__ silences extension warnings in the subexpression.
4187 ExtensionRAIIObject O(Diags); // Use RAII to do this.
4188 ConsumeToken();
4189 return ParseStructDeclaration(DS, FieldsCallback);
4190 }
4191
4192 // Parse leading attributes.
4193 ParsedAttributesWithRange Attrs(AttrFactory);
4194 MaybeParseCXX11Attributes(Attrs);
4195 DS.takeAttributesFrom(Attrs);
4196
4197 // Parse the common specifier-qualifiers-list piece.
4198 ParseSpecifierQualifierList(DS);
4199
4200 // If there are no declarators, this is a free-standing declaration
4201 // specifier. Let the actions module cope with it.
4202 if (Tok.is(tok::semi)) {
4203 RecordDecl *AnonRecord = nullptr;
4204 Decl *TheDecl = Actions.ParsedFreeStandingDeclSpec(getCurScope(), AS_none,
4205 DS, AnonRecord);
4206 assert(!AnonRecord && "Did not expect anonymous struct or union here");
4207 DS.complete(TheDecl);
4208 return;
4209 }
4210
4211 // Read struct-declarators until we find the semicolon.
4212 bool FirstDeclarator = true;
4213 SourceLocation CommaLoc;
4214 while (1) {
4215 ParsingFieldDeclarator DeclaratorInfo(*this, DS);
4216 DeclaratorInfo.D.setCommaLoc(CommaLoc);
4217
4218 // Attributes are only allowed here on successive declarators.
4219 if (!FirstDeclarator) {
4220 // However, this does not apply for [[]] attributes (which could show up
4221 // before or after the __attribute__ attributes).
4222 DiagnoseAndSkipCXX11Attributes();
4223 MaybeParseGNUAttributes(DeclaratorInfo.D);
4224 DiagnoseAndSkipCXX11Attributes();
4225 }
4226
4227 /// struct-declarator: declarator
4228 /// struct-declarator: declarator[opt] ':' constant-expression
4229 if (Tok.isNot(tok::colon)) {
4230 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
4231 ColonProtectionRAIIObject X(*this);
4232 ParseDeclarator(DeclaratorInfo.D);
4233 } else
4234 DeclaratorInfo.D.SetIdentifier(nullptr, Tok.getLocation());
4235
4236 if (TryConsumeToken(tok::colon)) {
4237 ExprResult Res(ParseConstantExpression());
4238 if (Res.isInvalid())
4239 SkipUntil(tok::semi, StopBeforeMatch);
4240 else
4241 DeclaratorInfo.BitfieldSize = Res.get();
4242 }
4243
4244 // If attributes exist after the declarator, parse them.
4245 MaybeParseGNUAttributes(DeclaratorInfo.D);
4246
4247 // We're done with this declarator; invoke the callback.
4248 FieldsCallback(DeclaratorInfo);
4249
4250 // If we don't have a comma, it is either the end of the list (a ';')
4251 // or an error, bail out.
4252 if (!TryConsumeToken(tok::comma, CommaLoc))
4253 return;
4254
4255 FirstDeclarator = false;
4256 }
4257 }
4258
4259 /// ParseStructUnionBody
4260 /// struct-contents:
4261 /// struct-declaration-list
4262 /// [EXT] empty
4263 /// [GNU] "struct-declaration-list" without terminating ';'
4264 /// struct-declaration-list:
4265 /// struct-declaration
4266 /// struct-declaration-list struct-declaration
4267 /// [OBC] '@' 'defs' '(' class-name ')'
4268 ///
ParseStructUnionBody(SourceLocation RecordLoc,DeclSpec::TST TagType,RecordDecl * TagDecl)4269 void Parser::ParseStructUnionBody(SourceLocation RecordLoc,
4270 DeclSpec::TST TagType, RecordDecl *TagDecl) {
4271 PrettyDeclStackTraceEntry CrashInfo(Actions.Context, TagDecl, RecordLoc,
4272 "parsing struct/union body");
4273 assert(!getLangOpts().CPlusPlus && "C++ declarations not supported");
4274
4275 BalancedDelimiterTracker T(*this, tok::l_brace);
4276 if (T.consumeOpen())
4277 return;
4278
4279 ParseScope StructScope(this, Scope::ClassScope|Scope::DeclScope);
4280 Actions.ActOnTagStartDefinition(getCurScope(), TagDecl);
4281
4282 // While we still have something to read, read the declarations in the struct.
4283 while (!tryParseMisplacedModuleImport() && Tok.isNot(tok::r_brace) &&
4284 Tok.isNot(tok::eof)) {
4285 // Each iteration of this loop reads one struct-declaration.
4286
4287 // Check for extraneous top-level semicolon.
4288 if (Tok.is(tok::semi)) {
4289 ConsumeExtraSemi(InsideStruct, TagType);
4290 continue;
4291 }
4292
4293 // Parse _Static_assert declaration.
4294 if (Tok.isOneOf(tok::kw__Static_assert, tok::kw_static_assert)) {
4295 SourceLocation DeclEnd;
4296 ParseStaticAssertDeclaration(DeclEnd);
4297 continue;
4298 }
4299
4300 if (Tok.is(tok::annot_pragma_pack)) {
4301 HandlePragmaPack();
4302 continue;
4303 }
4304
4305 if (Tok.is(tok::annot_pragma_align)) {
4306 HandlePragmaAlign();
4307 continue;
4308 }
4309
4310 if (Tok.isOneOf(tok::annot_pragma_openmp, tok::annot_attr_openmp)) {
4311 // Result can be ignored, because it must be always empty.
4312 AccessSpecifier AS = AS_none;
4313 ParsedAttributesWithRange Attrs(AttrFactory);
4314 (void)ParseOpenMPDeclarativeDirectiveWithExtDecl(AS, Attrs);
4315 continue;
4316 }
4317
4318 if (tok::isPragmaAnnotation(Tok.getKind())) {
4319 Diag(Tok.getLocation(), diag::err_pragma_misplaced_in_decl)
4320 << DeclSpec::getSpecifierName(
4321 TagType, Actions.getASTContext().getPrintingPolicy());
4322 ConsumeAnnotationToken();
4323 continue;
4324 }
4325
4326 if (!Tok.is(tok::at)) {
4327 auto CFieldCallback = [&](ParsingFieldDeclarator &FD) {
4328 // Install the declarator into the current TagDecl.
4329 Decl *Field =
4330 Actions.ActOnField(getCurScope(), TagDecl,
4331 FD.D.getDeclSpec().getSourceRange().getBegin(),
4332 FD.D, FD.BitfieldSize);
4333 FD.complete(Field);
4334 };
4335
4336 // Parse all the comma separated declarators.
4337 ParsingDeclSpec DS(*this);
4338 ParseStructDeclaration(DS, CFieldCallback);
4339 } else { // Handle @defs
4340 ConsumeToken();
4341 if (!Tok.isObjCAtKeyword(tok::objc_defs)) {
4342 Diag(Tok, diag::err_unexpected_at);
4343 SkipUntil(tok::semi);
4344 continue;
4345 }
4346 ConsumeToken();
4347 ExpectAndConsume(tok::l_paren);
4348 if (!Tok.is(tok::identifier)) {
4349 Diag(Tok, diag::err_expected) << tok::identifier;
4350 SkipUntil(tok::semi);
4351 continue;
4352 }
4353 SmallVector<Decl *, 16> Fields;
4354 Actions.ActOnDefs(getCurScope(), TagDecl, Tok.getLocation(),
4355 Tok.getIdentifierInfo(), Fields);
4356 ConsumeToken();
4357 ExpectAndConsume(tok::r_paren);
4358 }
4359
4360 if (TryConsumeToken(tok::semi))
4361 continue;
4362
4363 if (Tok.is(tok::r_brace)) {
4364 ExpectAndConsume(tok::semi, diag::ext_expected_semi_decl_list);
4365 break;
4366 }
4367
4368 ExpectAndConsume(tok::semi, diag::err_expected_semi_decl_list);
4369 // Skip to end of block or statement to avoid ext-warning on extra ';'.
4370 SkipUntil(tok::r_brace, StopAtSemi | StopBeforeMatch);
4371 // If we stopped at a ';', eat it.
4372 TryConsumeToken(tok::semi);
4373 }
4374
4375 T.consumeClose();
4376
4377 ParsedAttributes attrs(AttrFactory);
4378 // If attributes exist after struct contents, parse them.
4379 MaybeParseGNUAttributes(attrs);
4380
4381 SmallVector<Decl *, 32> FieldDecls(TagDecl->field_begin(),
4382 TagDecl->field_end());
4383
4384 Actions.ActOnFields(getCurScope(), RecordLoc, TagDecl, FieldDecls,
4385 T.getOpenLocation(), T.getCloseLocation(), attrs);
4386 StructScope.Exit();
4387 Actions.ActOnTagFinishDefinition(getCurScope(), TagDecl, T.getRange());
4388 }
4389
4390 /// ParseEnumSpecifier
4391 /// enum-specifier: [C99 6.7.2.2]
4392 /// 'enum' identifier[opt] '{' enumerator-list '}'
4393 ///[C99/C++]'enum' identifier[opt] '{' enumerator-list ',' '}'
4394 /// [GNU] 'enum' attributes[opt] identifier[opt] '{' enumerator-list ',' [opt]
4395 /// '}' attributes[opt]
4396 /// [MS] 'enum' __declspec[opt] identifier[opt] '{' enumerator-list ',' [opt]
4397 /// '}'
4398 /// 'enum' identifier
4399 /// [GNU] 'enum' attributes[opt] identifier
4400 ///
4401 /// [C++11] enum-head '{' enumerator-list[opt] '}'
4402 /// [C++11] enum-head '{' enumerator-list ',' '}'
4403 ///
4404 /// enum-head: [C++11]
4405 /// enum-key attribute-specifier-seq[opt] identifier[opt] enum-base[opt]
4406 /// enum-key attribute-specifier-seq[opt] nested-name-specifier
4407 /// identifier enum-base[opt]
4408 ///
4409 /// enum-key: [C++11]
4410 /// 'enum'
4411 /// 'enum' 'class'
4412 /// 'enum' 'struct'
4413 ///
4414 /// enum-base: [C++11]
4415 /// ':' type-specifier-seq
4416 ///
4417 /// [C++] elaborated-type-specifier:
4418 /// [C++] 'enum' nested-name-specifier[opt] identifier
4419 ///
ParseEnumSpecifier(SourceLocation StartLoc,DeclSpec & DS,const ParsedTemplateInfo & TemplateInfo,AccessSpecifier AS,DeclSpecContext DSC)4420 void Parser::ParseEnumSpecifier(SourceLocation StartLoc, DeclSpec &DS,
4421 const ParsedTemplateInfo &TemplateInfo,
4422 AccessSpecifier AS, DeclSpecContext DSC) {
4423 // Parse the tag portion of this.
4424 if (Tok.is(tok::code_completion)) {
4425 // Code completion for an enum name.
4426 cutOffParsing();
4427 Actions.CodeCompleteTag(getCurScope(), DeclSpec::TST_enum);
4428 return;
4429 }
4430
4431 // If attributes exist after tag, parse them.
4432 ParsedAttributesWithRange attrs(AttrFactory);
4433 MaybeParseAttributes(PAKM_GNU | PAKM_Declspec | PAKM_CXX11, attrs);
4434
4435 SourceLocation ScopedEnumKWLoc;
4436 bool IsScopedUsingClassTag = false;
4437
4438 // In C++11, recognize 'enum class' and 'enum struct'.
4439 if (Tok.isOneOf(tok::kw_class, tok::kw_struct)) {
4440 Diag(Tok, getLangOpts().CPlusPlus11 ? diag::warn_cxx98_compat_scoped_enum
4441 : diag::ext_scoped_enum);
4442 IsScopedUsingClassTag = Tok.is(tok::kw_class);
4443 ScopedEnumKWLoc = ConsumeToken();
4444
4445 // Attributes are not allowed between these keywords. Diagnose,
4446 // but then just treat them like they appeared in the right place.
4447 ProhibitAttributes(attrs);
4448
4449 // They are allowed afterwards, though.
4450 MaybeParseAttributes(PAKM_GNU | PAKM_Declspec | PAKM_CXX11, attrs);
4451 }
4452
4453 // C++11 [temp.explicit]p12:
4454 // The usual access controls do not apply to names used to specify
4455 // explicit instantiations.
4456 // We extend this to also cover explicit specializations. Note that
4457 // we don't suppress if this turns out to be an elaborated type
4458 // specifier.
4459 bool shouldDelayDiagsInTag =
4460 (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation ||
4461 TemplateInfo.Kind == ParsedTemplateInfo::ExplicitSpecialization);
4462 SuppressAccessChecks diagsFromTag(*this, shouldDelayDiagsInTag);
4463
4464 // Determine whether this declaration is permitted to have an enum-base.
4465 AllowDefiningTypeSpec AllowEnumSpecifier =
4466 isDefiningTypeSpecifierContext(DSC);
4467 bool CanBeOpaqueEnumDeclaration =
4468 DS.isEmpty() && isOpaqueEnumDeclarationContext(DSC);
4469 bool CanHaveEnumBase = (getLangOpts().CPlusPlus11 || getLangOpts().ObjC ||
4470 getLangOpts().MicrosoftExt) &&
4471 (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes ||
4472 CanBeOpaqueEnumDeclaration);
4473
4474 CXXScopeSpec &SS = DS.getTypeSpecScope();
4475 if (getLangOpts().CPlusPlus) {
4476 // "enum foo : bar;" is not a potential typo for "enum foo::bar;".
4477 ColonProtectionRAIIObject X(*this);
4478
4479 CXXScopeSpec Spec;
4480 if (ParseOptionalCXXScopeSpecifier(Spec, /*ObjectType=*/nullptr,
4481 /*ObjectHadErrors=*/false,
4482 /*EnteringContext=*/true))
4483 return;
4484
4485 if (Spec.isSet() && Tok.isNot(tok::identifier)) {
4486 Diag(Tok, diag::err_expected) << tok::identifier;
4487 if (Tok.isNot(tok::l_brace)) {
4488 // Has no name and is not a definition.
4489 // Skip the rest of this declarator, up until the comma or semicolon.
4490 SkipUntil(tok::comma, StopAtSemi);
4491 return;
4492 }
4493 }
4494
4495 SS = Spec;
4496 }
4497
4498 // Must have either 'enum name' or 'enum {...}' or (rarely) 'enum : T { ... }'.
4499 if (Tok.isNot(tok::identifier) && Tok.isNot(tok::l_brace) &&
4500 Tok.isNot(tok::colon)) {
4501 Diag(Tok, diag::err_expected_either) << tok::identifier << tok::l_brace;
4502
4503 // Skip the rest of this declarator, up until the comma or semicolon.
4504 SkipUntil(tok::comma, StopAtSemi);
4505 return;
4506 }
4507
4508 // If an identifier is present, consume and remember it.
4509 IdentifierInfo *Name = nullptr;
4510 SourceLocation NameLoc;
4511 if (Tok.is(tok::identifier)) {
4512 Name = Tok.getIdentifierInfo();
4513 NameLoc = ConsumeToken();
4514 }
4515
4516 if (!Name && ScopedEnumKWLoc.isValid()) {
4517 // C++0x 7.2p2: The optional identifier shall not be omitted in the
4518 // declaration of a scoped enumeration.
4519 Diag(Tok, diag::err_scoped_enum_missing_identifier);
4520 ScopedEnumKWLoc = SourceLocation();
4521 IsScopedUsingClassTag = false;
4522 }
4523
4524 // Okay, end the suppression area. We'll decide whether to emit the
4525 // diagnostics in a second.
4526 if (shouldDelayDiagsInTag)
4527 diagsFromTag.done();
4528
4529 TypeResult BaseType;
4530 SourceRange BaseRange;
4531
4532 bool CanBeBitfield = (getCurScope()->getFlags() & Scope::ClassScope) &&
4533 ScopedEnumKWLoc.isInvalid() && Name;
4534
4535 // Parse the fixed underlying type.
4536 if (Tok.is(tok::colon)) {
4537 // This might be an enum-base or part of some unrelated enclosing context.
4538 //
4539 // 'enum E : base' is permitted in two circumstances:
4540 //
4541 // 1) As a defining-type-specifier, when followed by '{'.
4542 // 2) As the sole constituent of a complete declaration -- when DS is empty
4543 // and the next token is ';'.
4544 //
4545 // The restriction to defining-type-specifiers is important to allow parsing
4546 // a ? new enum E : int{}
4547 // _Generic(a, enum E : int{})
4548 // properly.
4549 //
4550 // One additional consideration applies:
4551 //
4552 // C++ [dcl.enum]p1:
4553 // A ':' following "enum nested-name-specifier[opt] identifier" within
4554 // the decl-specifier-seq of a member-declaration is parsed as part of
4555 // an enum-base.
4556 //
4557 // Other language modes supporting enumerations with fixed underlying types
4558 // do not have clear rules on this, so we disambiguate to determine whether
4559 // the tokens form a bit-field width or an enum-base.
4560
4561 if (CanBeBitfield && !isEnumBase(CanBeOpaqueEnumDeclaration)) {
4562 // Outside C++11, do not interpret the tokens as an enum-base if they do
4563 // not make sense as one. In C++11, it's an error if this happens.
4564 if (getLangOpts().CPlusPlus11)
4565 Diag(Tok.getLocation(), diag::err_anonymous_enum_bitfield);
4566 } else if (CanHaveEnumBase || !ColonIsSacred) {
4567 SourceLocation ColonLoc = ConsumeToken();
4568
4569 // Parse a type-specifier-seq as a type. We can't just ParseTypeName here,
4570 // because under -fms-extensions,
4571 // enum E : int *p;
4572 // declares 'enum E : int; E *p;' not 'enum E : int*; E p;'.
4573 DeclSpec DS(AttrFactory);
4574 ParseSpecifierQualifierList(DS, AS, DeclSpecContext::DSC_type_specifier);
4575 Declarator DeclaratorInfo(DS, DeclaratorContext::TypeName);
4576 BaseType = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
4577
4578 BaseRange = SourceRange(ColonLoc, DeclaratorInfo.getSourceRange().getEnd());
4579
4580 if (!getLangOpts().ObjC) {
4581 if (getLangOpts().CPlusPlus11)
4582 Diag(ColonLoc, diag::warn_cxx98_compat_enum_fixed_underlying_type)
4583 << BaseRange;
4584 else if (getLangOpts().CPlusPlus)
4585 Diag(ColonLoc, diag::ext_cxx11_enum_fixed_underlying_type)
4586 << BaseRange;
4587 else if (getLangOpts().MicrosoftExt)
4588 Diag(ColonLoc, diag::ext_ms_c_enum_fixed_underlying_type)
4589 << BaseRange;
4590 else
4591 Diag(ColonLoc, diag::ext_clang_c_enum_fixed_underlying_type)
4592 << BaseRange;
4593 }
4594 }
4595 }
4596
4597 // There are four options here. If we have 'friend enum foo;' then this is a
4598 // friend declaration, and cannot have an accompanying definition. If we have
4599 // 'enum foo;', then this is a forward declaration. If we have
4600 // 'enum foo {...' then this is a definition. Otherwise we have something
4601 // like 'enum foo xyz', a reference.
4602 //
4603 // This is needed to handle stuff like this right (C99 6.7.2.3p11):
4604 // enum foo {..}; void bar() { enum foo; } <- new foo in bar.
4605 // enum foo {..}; void bar() { enum foo x; } <- use of old foo.
4606 //
4607 Sema::TagUseKind TUK;
4608 if (AllowEnumSpecifier == AllowDefiningTypeSpec::No)
4609 TUK = Sema::TUK_Reference;
4610 else if (Tok.is(tok::l_brace)) {
4611 if (DS.isFriendSpecified()) {
4612 Diag(Tok.getLocation(), diag::err_friend_decl_defines_type)
4613 << SourceRange(DS.getFriendSpecLoc());
4614 ConsumeBrace();
4615 SkipUntil(tok::r_brace, StopAtSemi);
4616 // Discard any other definition-only pieces.
4617 attrs.clear();
4618 ScopedEnumKWLoc = SourceLocation();
4619 IsScopedUsingClassTag = false;
4620 BaseType = TypeResult();
4621 TUK = Sema::TUK_Friend;
4622 } else {
4623 TUK = Sema::TUK_Definition;
4624 }
4625 } else if (!isTypeSpecifier(DSC) &&
4626 (Tok.is(tok::semi) ||
4627 (Tok.isAtStartOfLine() &&
4628 !isValidAfterTypeSpecifier(CanBeBitfield)))) {
4629 // An opaque-enum-declaration is required to be standalone (no preceding or
4630 // following tokens in the declaration). Sema enforces this separately by
4631 // diagnosing anything else in the DeclSpec.
4632 TUK = DS.isFriendSpecified() ? Sema::TUK_Friend : Sema::TUK_Declaration;
4633 if (Tok.isNot(tok::semi)) {
4634 // A semicolon was missing after this declaration. Diagnose and recover.
4635 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum");
4636 PP.EnterToken(Tok, /*IsReinject=*/true);
4637 Tok.setKind(tok::semi);
4638 }
4639 } else {
4640 TUK = Sema::TUK_Reference;
4641 }
4642
4643 bool IsElaboratedTypeSpecifier =
4644 TUK == Sema::TUK_Reference || TUK == Sema::TUK_Friend;
4645
4646 // If this is an elaborated type specifier nested in a larger declaration,
4647 // and we delayed diagnostics before, just merge them into the current pool.
4648 if (TUK == Sema::TUK_Reference && shouldDelayDiagsInTag) {
4649 diagsFromTag.redelay();
4650 }
4651
4652 MultiTemplateParamsArg TParams;
4653 if (TemplateInfo.Kind != ParsedTemplateInfo::NonTemplate &&
4654 TUK != Sema::TUK_Reference) {
4655 if (!getLangOpts().CPlusPlus11 || !SS.isSet()) {
4656 // Skip the rest of this declarator, up until the comma or semicolon.
4657 Diag(Tok, diag::err_enum_template);
4658 SkipUntil(tok::comma, StopAtSemi);
4659 return;
4660 }
4661
4662 if (TemplateInfo.Kind == ParsedTemplateInfo::ExplicitInstantiation) {
4663 // Enumerations can't be explicitly instantiated.
4664 DS.SetTypeSpecError();
4665 Diag(StartLoc, diag::err_explicit_instantiation_enum);
4666 return;
4667 }
4668
4669 assert(TemplateInfo.TemplateParams && "no template parameters");
4670 TParams = MultiTemplateParamsArg(TemplateInfo.TemplateParams->data(),
4671 TemplateInfo.TemplateParams->size());
4672 }
4673
4674 if (!Name && TUK != Sema::TUK_Definition) {
4675 Diag(Tok, diag::err_enumerator_unnamed_no_def);
4676
4677 // Skip the rest of this declarator, up until the comma or semicolon.
4678 SkipUntil(tok::comma, StopAtSemi);
4679 return;
4680 }
4681
4682 // An elaborated-type-specifier has a much more constrained grammar:
4683 //
4684 // 'enum' nested-name-specifier[opt] identifier
4685 //
4686 // If we parsed any other bits, reject them now.
4687 //
4688 // MSVC and (for now at least) Objective-C permit a full enum-specifier
4689 // or opaque-enum-declaration anywhere.
4690 if (IsElaboratedTypeSpecifier && !getLangOpts().MicrosoftExt &&
4691 !getLangOpts().ObjC) {
4692 ProhibitCXX11Attributes(attrs, diag::err_attributes_not_allowed,
4693 /*DiagnoseEmptyAttrs=*/true);
4694 if (BaseType.isUsable())
4695 Diag(BaseRange.getBegin(), diag::ext_enum_base_in_type_specifier)
4696 << (AllowEnumSpecifier == AllowDefiningTypeSpec::Yes) << BaseRange;
4697 else if (ScopedEnumKWLoc.isValid())
4698 Diag(ScopedEnumKWLoc, diag::ext_elaborated_enum_class)
4699 << FixItHint::CreateRemoval(ScopedEnumKWLoc) << IsScopedUsingClassTag;
4700 }
4701
4702 stripTypeAttributesOffDeclSpec(attrs, DS, TUK);
4703
4704 Sema::SkipBodyInfo SkipBody;
4705 if (!Name && TUK == Sema::TUK_Definition && Tok.is(tok::l_brace) &&
4706 NextToken().is(tok::identifier))
4707 SkipBody = Actions.shouldSkipAnonEnumBody(getCurScope(),
4708 NextToken().getIdentifierInfo(),
4709 NextToken().getLocation());
4710
4711 bool Owned = false;
4712 bool IsDependent = false;
4713 const char *PrevSpec = nullptr;
4714 unsigned DiagID;
4715 Decl *TagDecl = Actions.ActOnTag(
4716 getCurScope(), DeclSpec::TST_enum, TUK, StartLoc, SS, Name, NameLoc,
4717 attrs, AS, DS.getModulePrivateSpecLoc(), TParams, Owned, IsDependent,
4718 ScopedEnumKWLoc, IsScopedUsingClassTag, BaseType,
4719 DSC == DeclSpecContext::DSC_type_specifier,
4720 DSC == DeclSpecContext::DSC_template_param ||
4721 DSC == DeclSpecContext::DSC_template_type_arg,
4722 &SkipBody);
4723
4724 if (SkipBody.ShouldSkip) {
4725 assert(TUK == Sema::TUK_Definition && "can only skip a definition");
4726
4727 BalancedDelimiterTracker T(*this, tok::l_brace);
4728 T.consumeOpen();
4729 T.skipToEnd();
4730
4731 if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc,
4732 NameLoc.isValid() ? NameLoc : StartLoc,
4733 PrevSpec, DiagID, TagDecl, Owned,
4734 Actions.getASTContext().getPrintingPolicy()))
4735 Diag(StartLoc, DiagID) << PrevSpec;
4736 return;
4737 }
4738
4739 if (IsDependent) {
4740 // This enum has a dependent nested-name-specifier. Handle it as a
4741 // dependent tag.
4742 if (!Name) {
4743 DS.SetTypeSpecError();
4744 Diag(Tok, diag::err_expected_type_name_after_typename);
4745 return;
4746 }
4747
4748 TypeResult Type = Actions.ActOnDependentTag(
4749 getCurScope(), DeclSpec::TST_enum, TUK, SS, Name, StartLoc, NameLoc);
4750 if (Type.isInvalid()) {
4751 DS.SetTypeSpecError();
4752 return;
4753 }
4754
4755 if (DS.SetTypeSpecType(DeclSpec::TST_typename, StartLoc,
4756 NameLoc.isValid() ? NameLoc : StartLoc,
4757 PrevSpec, DiagID, Type.get(),
4758 Actions.getASTContext().getPrintingPolicy()))
4759 Diag(StartLoc, DiagID) << PrevSpec;
4760
4761 return;
4762 }
4763
4764 if (!TagDecl) {
4765 // The action failed to produce an enumeration tag. If this is a
4766 // definition, consume the entire definition.
4767 if (Tok.is(tok::l_brace) && TUK != Sema::TUK_Reference) {
4768 ConsumeBrace();
4769 SkipUntil(tok::r_brace, StopAtSemi);
4770 }
4771
4772 DS.SetTypeSpecError();
4773 return;
4774 }
4775
4776 if (Tok.is(tok::l_brace) && TUK == Sema::TUK_Definition) {
4777 Decl *D = SkipBody.CheckSameAsPrevious ? SkipBody.New : TagDecl;
4778 ParseEnumBody(StartLoc, D);
4779 if (SkipBody.CheckSameAsPrevious &&
4780 !Actions.ActOnDuplicateDefinition(DS, TagDecl, SkipBody)) {
4781 DS.SetTypeSpecError();
4782 return;
4783 }
4784 }
4785
4786 if (DS.SetTypeSpecType(DeclSpec::TST_enum, StartLoc,
4787 NameLoc.isValid() ? NameLoc : StartLoc,
4788 PrevSpec, DiagID, TagDecl, Owned,
4789 Actions.getASTContext().getPrintingPolicy()))
4790 Diag(StartLoc, DiagID) << PrevSpec;
4791 }
4792
4793 /// ParseEnumBody - Parse a {} enclosed enumerator-list.
4794 /// enumerator-list:
4795 /// enumerator
4796 /// enumerator-list ',' enumerator
4797 /// enumerator:
4798 /// enumeration-constant attributes[opt]
4799 /// enumeration-constant attributes[opt] '=' constant-expression
4800 /// enumeration-constant:
4801 /// identifier
4802 ///
ParseEnumBody(SourceLocation StartLoc,Decl * EnumDecl)4803 void Parser::ParseEnumBody(SourceLocation StartLoc, Decl *EnumDecl) {
4804 // Enter the scope of the enum body and start the definition.
4805 ParseScope EnumScope(this, Scope::DeclScope | Scope::EnumScope);
4806 Actions.ActOnTagStartDefinition(getCurScope(), EnumDecl);
4807
4808 BalancedDelimiterTracker T(*this, tok::l_brace);
4809 T.consumeOpen();
4810
4811 // C does not allow an empty enumerator-list, C++ does [dcl.enum].
4812 if (Tok.is(tok::r_brace) && !getLangOpts().CPlusPlus)
4813 Diag(Tok, diag::err_empty_enum);
4814
4815 SmallVector<Decl *, 32> EnumConstantDecls;
4816 SmallVector<SuppressAccessChecks, 32> EnumAvailabilityDiags;
4817
4818 Decl *LastEnumConstDecl = nullptr;
4819
4820 // Parse the enumerator-list.
4821 while (Tok.isNot(tok::r_brace)) {
4822 // Parse enumerator. If failed, try skipping till the start of the next
4823 // enumerator definition.
4824 if (Tok.isNot(tok::identifier)) {
4825 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
4826 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch) &&
4827 TryConsumeToken(tok::comma))
4828 continue;
4829 break;
4830 }
4831 IdentifierInfo *Ident = Tok.getIdentifierInfo();
4832 SourceLocation IdentLoc = ConsumeToken();
4833
4834 // If attributes exist after the enumerator, parse them.
4835 ParsedAttributesWithRange attrs(AttrFactory);
4836 MaybeParseGNUAttributes(attrs);
4837 if (standardAttributesAllowed() && isCXX11AttributeSpecifier()) {
4838 if (getLangOpts().CPlusPlus)
4839 Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
4840 ? diag::warn_cxx14_compat_ns_enum_attribute
4841 : diag::ext_ns_enum_attribute)
4842 << 1 /*enumerator*/;
4843 ParseCXX11Attributes(attrs);
4844 }
4845
4846 SourceLocation EqualLoc;
4847 ExprResult AssignedVal;
4848 EnumAvailabilityDiags.emplace_back(*this);
4849
4850 EnterExpressionEvaluationContext ConstantEvaluated(
4851 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
4852 if (TryConsumeToken(tok::equal, EqualLoc)) {
4853 AssignedVal = ParseConstantExpressionInExprEvalContext();
4854 if (AssignedVal.isInvalid())
4855 SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch);
4856 }
4857
4858 // Install the enumerator constant into EnumDecl.
4859 Decl *EnumConstDecl = Actions.ActOnEnumConstant(
4860 getCurScope(), EnumDecl, LastEnumConstDecl, IdentLoc, Ident, attrs,
4861 EqualLoc, AssignedVal.get());
4862 EnumAvailabilityDiags.back().done();
4863
4864 EnumConstantDecls.push_back(EnumConstDecl);
4865 LastEnumConstDecl = EnumConstDecl;
4866
4867 if (Tok.is(tok::identifier)) {
4868 // We're missing a comma between enumerators.
4869 SourceLocation Loc = getEndOfPreviousToken();
4870 Diag(Loc, diag::err_enumerator_list_missing_comma)
4871 << FixItHint::CreateInsertion(Loc, ", ");
4872 continue;
4873 }
4874
4875 // Emumerator definition must be finished, only comma or r_brace are
4876 // allowed here.
4877 SourceLocation CommaLoc;
4878 if (Tok.isNot(tok::r_brace) && !TryConsumeToken(tok::comma, CommaLoc)) {
4879 if (EqualLoc.isValid())
4880 Diag(Tok.getLocation(), diag::err_expected_either) << tok::r_brace
4881 << tok::comma;
4882 else
4883 Diag(Tok.getLocation(), diag::err_expected_end_of_enumerator);
4884 if (SkipUntil(tok::comma, tok::r_brace, StopBeforeMatch)) {
4885 if (TryConsumeToken(tok::comma, CommaLoc))
4886 continue;
4887 } else {
4888 break;
4889 }
4890 }
4891
4892 // If comma is followed by r_brace, emit appropriate warning.
4893 if (Tok.is(tok::r_brace) && CommaLoc.isValid()) {
4894 if (!getLangOpts().C99 && !getLangOpts().CPlusPlus11)
4895 Diag(CommaLoc, getLangOpts().CPlusPlus ?
4896 diag::ext_enumerator_list_comma_cxx :
4897 diag::ext_enumerator_list_comma_c)
4898 << FixItHint::CreateRemoval(CommaLoc);
4899 else if (getLangOpts().CPlusPlus11)
4900 Diag(CommaLoc, diag::warn_cxx98_compat_enumerator_list_comma)
4901 << FixItHint::CreateRemoval(CommaLoc);
4902 break;
4903 }
4904 }
4905
4906 // Eat the }.
4907 T.consumeClose();
4908
4909 // If attributes exist after the identifier list, parse them.
4910 ParsedAttributes attrs(AttrFactory);
4911 MaybeParseGNUAttributes(attrs);
4912
4913 Actions.ActOnEnumBody(StartLoc, T.getRange(), EnumDecl, EnumConstantDecls,
4914 getCurScope(), attrs);
4915
4916 // Now handle enum constant availability diagnostics.
4917 assert(EnumConstantDecls.size() == EnumAvailabilityDiags.size());
4918 for (size_t i = 0, e = EnumConstantDecls.size(); i != e; ++i) {
4919 ParsingDeclRAIIObject PD(*this, ParsingDeclRAIIObject::NoParent);
4920 EnumAvailabilityDiags[i].redelay();
4921 PD.complete(EnumConstantDecls[i]);
4922 }
4923
4924 EnumScope.Exit();
4925 Actions.ActOnTagFinishDefinition(getCurScope(), EnumDecl, T.getRange());
4926
4927 // The next token must be valid after an enum definition. If not, a ';'
4928 // was probably forgotten.
4929 bool CanBeBitfield = getCurScope()->getFlags() & Scope::ClassScope;
4930 if (!isValidAfterTypeSpecifier(CanBeBitfield)) {
4931 ExpectAndConsume(tok::semi, diag::err_expected_after, "enum");
4932 // Push this token back into the preprocessor and change our current token
4933 // to ';' so that the rest of the code recovers as though there were an
4934 // ';' after the definition.
4935 PP.EnterToken(Tok, /*IsReinject=*/true);
4936 Tok.setKind(tok::semi);
4937 }
4938 }
4939
4940 /// isKnownToBeTypeSpecifier - Return true if we know that the specified token
4941 /// is definitely a type-specifier. Return false if it isn't part of a type
4942 /// specifier or if we're not sure.
isKnownToBeTypeSpecifier(const Token & Tok) const4943 bool Parser::isKnownToBeTypeSpecifier(const Token &Tok) const {
4944 switch (Tok.getKind()) {
4945 default: return false;
4946 // type-specifiers
4947 case tok::kw_short:
4948 case tok::kw_long:
4949 case tok::kw___int64:
4950 case tok::kw___int128:
4951 case tok::kw_signed:
4952 case tok::kw_unsigned:
4953 case tok::kw__Complex:
4954 case tok::kw__Imaginary:
4955 case tok::kw_void:
4956 case tok::kw_char:
4957 case tok::kw_wchar_t:
4958 case tok::kw_char8_t:
4959 case tok::kw_char16_t:
4960 case tok::kw_char32_t:
4961 case tok::kw_int:
4962 case tok::kw__ExtInt:
4963 case tok::kw___bf16:
4964 case tok::kw_half:
4965 case tok::kw_float:
4966 case tok::kw_double:
4967 case tok::kw__Accum:
4968 case tok::kw__Fract:
4969 case tok::kw__Float16:
4970 case tok::kw___float128:
4971 case tok::kw_bool:
4972 case tok::kw__Bool:
4973 case tok::kw__Decimal32:
4974 case tok::kw__Decimal64:
4975 case tok::kw__Decimal128:
4976 case tok::kw___vector:
4977 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
4978 #include "clang/Basic/OpenCLImageTypes.def"
4979
4980 // struct-or-union-specifier (C99) or class-specifier (C++)
4981 case tok::kw_class:
4982 case tok::kw_struct:
4983 case tok::kw___interface:
4984 case tok::kw_union:
4985 // enum-specifier
4986 case tok::kw_enum:
4987
4988 // typedef-name
4989 case tok::annot_typename:
4990 return true;
4991 }
4992 }
4993
4994 /// isTypeSpecifierQualifier - Return true if the current token could be the
4995 /// start of a specifier-qualifier-list.
isTypeSpecifierQualifier()4996 bool Parser::isTypeSpecifierQualifier() {
4997 switch (Tok.getKind()) {
4998 default: return false;
4999
5000 case tok::identifier: // foo::bar
5001 if (TryAltiVecVectorToken())
5002 return true;
5003 LLVM_FALLTHROUGH;
5004 case tok::kw_typename: // typename T::type
5005 // Annotate typenames and C++ scope specifiers. If we get one, just
5006 // recurse to handle whatever we get.
5007 if (TryAnnotateTypeOrScopeToken())
5008 return true;
5009 if (Tok.is(tok::identifier))
5010 return false;
5011 return isTypeSpecifierQualifier();
5012
5013 case tok::coloncolon: // ::foo::bar
5014 if (NextToken().is(tok::kw_new) || // ::new
5015 NextToken().is(tok::kw_delete)) // ::delete
5016 return false;
5017
5018 if (TryAnnotateTypeOrScopeToken())
5019 return true;
5020 return isTypeSpecifierQualifier();
5021
5022 // GNU attributes support.
5023 case tok::kw___attribute:
5024 // GNU typeof support.
5025 case tok::kw_typeof:
5026
5027 // type-specifiers
5028 case tok::kw_short:
5029 case tok::kw_long:
5030 case tok::kw___int64:
5031 case tok::kw___int128:
5032 case tok::kw_signed:
5033 case tok::kw_unsigned:
5034 case tok::kw__Complex:
5035 case tok::kw__Imaginary:
5036 case tok::kw_void:
5037 case tok::kw_char:
5038 case tok::kw_wchar_t:
5039 case tok::kw_char8_t:
5040 case tok::kw_char16_t:
5041 case tok::kw_char32_t:
5042 case tok::kw_int:
5043 case tok::kw__ExtInt:
5044 case tok::kw_half:
5045 case tok::kw___bf16:
5046 case tok::kw_float:
5047 case tok::kw_double:
5048 case tok::kw__Accum:
5049 case tok::kw__Fract:
5050 case tok::kw__Float16:
5051 case tok::kw___float128:
5052 case tok::kw_bool:
5053 case tok::kw__Bool:
5054 case tok::kw__Decimal32:
5055 case tok::kw__Decimal64:
5056 case tok::kw__Decimal128:
5057 case tok::kw___vector:
5058 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
5059 #include "clang/Basic/OpenCLImageTypes.def"
5060
5061 // struct-or-union-specifier (C99) or class-specifier (C++)
5062 case tok::kw_class:
5063 case tok::kw_struct:
5064 case tok::kw___interface:
5065 case tok::kw_union:
5066 // enum-specifier
5067 case tok::kw_enum:
5068
5069 // type-qualifier
5070 case tok::kw_const:
5071 case tok::kw_volatile:
5072 case tok::kw_restrict:
5073 case tok::kw__Sat:
5074
5075 // Debugger support.
5076 case tok::kw___unknown_anytype:
5077
5078 // typedef-name
5079 case tok::annot_typename:
5080 return true;
5081
5082 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
5083 case tok::less:
5084 return getLangOpts().ObjC;
5085
5086 case tok::kw___cdecl:
5087 case tok::kw___stdcall:
5088 case tok::kw___fastcall:
5089 case tok::kw___thiscall:
5090 case tok::kw___regcall:
5091 case tok::kw___vectorcall:
5092 case tok::kw___w64:
5093 case tok::kw___ptr64:
5094 case tok::kw___ptr32:
5095 case tok::kw___pascal:
5096 case tok::kw___unaligned:
5097
5098 case tok::kw__Nonnull:
5099 case tok::kw__Nullable:
5100 case tok::kw__Nullable_result:
5101 case tok::kw__Null_unspecified:
5102
5103 case tok::kw___kindof:
5104
5105 case tok::kw___private:
5106 case tok::kw___local:
5107 case tok::kw___global:
5108 case tok::kw___constant:
5109 case tok::kw___generic:
5110 case tok::kw___read_only:
5111 case tok::kw___read_write:
5112 case tok::kw___write_only:
5113 return true;
5114
5115 case tok::kw_private:
5116 return getLangOpts().OpenCL;
5117
5118 // C11 _Atomic
5119 case tok::kw__Atomic:
5120 return true;
5121 }
5122 }
5123
5124 /// isDeclarationSpecifier() - Return true if the current token is part of a
5125 /// declaration specifier.
5126 ///
5127 /// \param DisambiguatingWithExpression True to indicate that the purpose of
5128 /// this check is to disambiguate between an expression and a declaration.
isDeclarationSpecifier(bool DisambiguatingWithExpression)5129 bool Parser::isDeclarationSpecifier(bool DisambiguatingWithExpression) {
5130 switch (Tok.getKind()) {
5131 default: return false;
5132
5133 // OpenCL 2.0 and later define this keyword.
5134 case tok::kw_pipe:
5135 return (getLangOpts().OpenCL && getLangOpts().OpenCLVersion >= 200) ||
5136 getLangOpts().OpenCLCPlusPlus;
5137
5138 case tok::identifier: // foo::bar
5139 // Unfortunate hack to support "Class.factoryMethod" notation.
5140 if (getLangOpts().ObjC && NextToken().is(tok::period))
5141 return false;
5142 if (TryAltiVecVectorToken())
5143 return true;
5144 LLVM_FALLTHROUGH;
5145 case tok::kw_decltype: // decltype(T())::type
5146 case tok::kw_typename: // typename T::type
5147 // Annotate typenames and C++ scope specifiers. If we get one, just
5148 // recurse to handle whatever we get.
5149 if (TryAnnotateTypeOrScopeToken())
5150 return true;
5151 if (TryAnnotateTypeConstraint())
5152 return true;
5153 if (Tok.is(tok::identifier))
5154 return false;
5155
5156 // If we're in Objective-C and we have an Objective-C class type followed
5157 // by an identifier and then either ':' or ']', in a place where an
5158 // expression is permitted, then this is probably a class message send
5159 // missing the initial '['. In this case, we won't consider this to be
5160 // the start of a declaration.
5161 if (DisambiguatingWithExpression &&
5162 isStartOfObjCClassMessageMissingOpenBracket())
5163 return false;
5164
5165 return isDeclarationSpecifier();
5166
5167 case tok::coloncolon: // ::foo::bar
5168 if (NextToken().is(tok::kw_new) || // ::new
5169 NextToken().is(tok::kw_delete)) // ::delete
5170 return false;
5171
5172 // Annotate typenames and C++ scope specifiers. If we get one, just
5173 // recurse to handle whatever we get.
5174 if (TryAnnotateTypeOrScopeToken())
5175 return true;
5176 return isDeclarationSpecifier();
5177
5178 // storage-class-specifier
5179 case tok::kw_typedef:
5180 case tok::kw_extern:
5181 case tok::kw___private_extern__:
5182 case tok::kw_static:
5183 case tok::kw_auto:
5184 case tok::kw___auto_type:
5185 case tok::kw_register:
5186 case tok::kw___thread:
5187 case tok::kw_thread_local:
5188 case tok::kw__Thread_local:
5189
5190 // Modules
5191 case tok::kw___module_private__:
5192
5193 // Debugger support
5194 case tok::kw___unknown_anytype:
5195
5196 // type-specifiers
5197 case tok::kw_short:
5198 case tok::kw_long:
5199 case tok::kw___int64:
5200 case tok::kw___int128:
5201 case tok::kw_signed:
5202 case tok::kw_unsigned:
5203 case tok::kw__Complex:
5204 case tok::kw__Imaginary:
5205 case tok::kw_void:
5206 case tok::kw_char:
5207 case tok::kw_wchar_t:
5208 case tok::kw_char8_t:
5209 case tok::kw_char16_t:
5210 case tok::kw_char32_t:
5211
5212 case tok::kw_int:
5213 case tok::kw__ExtInt:
5214 case tok::kw_half:
5215 case tok::kw___bf16:
5216 case tok::kw_float:
5217 case tok::kw_double:
5218 case tok::kw__Accum:
5219 case tok::kw__Fract:
5220 case tok::kw__Float16:
5221 case tok::kw___float128:
5222 case tok::kw_bool:
5223 case tok::kw__Bool:
5224 case tok::kw__Decimal32:
5225 case tok::kw__Decimal64:
5226 case tok::kw__Decimal128:
5227 case tok::kw___vector:
5228
5229 // struct-or-union-specifier (C99) or class-specifier (C++)
5230 case tok::kw_class:
5231 case tok::kw_struct:
5232 case tok::kw_union:
5233 case tok::kw___interface:
5234 // enum-specifier
5235 case tok::kw_enum:
5236
5237 // type-qualifier
5238 case tok::kw_const:
5239 case tok::kw_volatile:
5240 case tok::kw_restrict:
5241 case tok::kw__Sat:
5242
5243 // function-specifier
5244 case tok::kw_inline:
5245 case tok::kw_virtual:
5246 case tok::kw_explicit:
5247 case tok::kw__Noreturn:
5248
5249 // alignment-specifier
5250 case tok::kw__Alignas:
5251
5252 // friend keyword.
5253 case tok::kw_friend:
5254
5255 // static_assert-declaration
5256 case tok::kw_static_assert:
5257 case tok::kw__Static_assert:
5258
5259 // GNU typeof support.
5260 case tok::kw_typeof:
5261
5262 // GNU attributes.
5263 case tok::kw___attribute:
5264
5265 // C++11 decltype and constexpr.
5266 case tok::annot_decltype:
5267 case tok::kw_constexpr:
5268
5269 // C++20 consteval and constinit.
5270 case tok::kw_consteval:
5271 case tok::kw_constinit:
5272
5273 // C11 _Atomic
5274 case tok::kw__Atomic:
5275 return true;
5276
5277 // GNU ObjC bizarre protocol extension: <proto1,proto2> with implicit 'id'.
5278 case tok::less:
5279 return getLangOpts().ObjC;
5280
5281 // typedef-name
5282 case tok::annot_typename:
5283 return !DisambiguatingWithExpression ||
5284 !isStartOfObjCClassMessageMissingOpenBracket();
5285
5286 // placeholder-type-specifier
5287 case tok::annot_template_id: {
5288 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
5289 if (TemplateId->hasInvalidName())
5290 return true;
5291 // FIXME: What about type templates that have only been annotated as
5292 // annot_template_id, not as annot_typename?
5293 return isTypeConstraintAnnotation() &&
5294 (NextToken().is(tok::kw_auto) || NextToken().is(tok::kw_decltype));
5295 }
5296
5297 case tok::annot_cxxscope: {
5298 TemplateIdAnnotation *TemplateId =
5299 NextToken().is(tok::annot_template_id)
5300 ? takeTemplateIdAnnotation(NextToken())
5301 : nullptr;
5302 if (TemplateId && TemplateId->hasInvalidName())
5303 return true;
5304 // FIXME: What about type templates that have only been annotated as
5305 // annot_template_id, not as annot_typename?
5306 if (NextToken().is(tok::identifier) && TryAnnotateTypeConstraint())
5307 return true;
5308 return isTypeConstraintAnnotation() &&
5309 GetLookAheadToken(2).isOneOf(tok::kw_auto, tok::kw_decltype);
5310 }
5311
5312 case tok::kw___declspec:
5313 case tok::kw___cdecl:
5314 case tok::kw___stdcall:
5315 case tok::kw___fastcall:
5316 case tok::kw___thiscall:
5317 case tok::kw___regcall:
5318 case tok::kw___vectorcall:
5319 case tok::kw___w64:
5320 case tok::kw___sptr:
5321 case tok::kw___uptr:
5322 case tok::kw___ptr64:
5323 case tok::kw___ptr32:
5324 case tok::kw___forceinline:
5325 case tok::kw___pascal:
5326 case tok::kw___unaligned:
5327
5328 case tok::kw__Nonnull:
5329 case tok::kw__Nullable:
5330 case tok::kw__Nullable_result:
5331 case tok::kw__Null_unspecified:
5332
5333 case tok::kw___kindof:
5334
5335 case tok::kw___private:
5336 case tok::kw___local:
5337 case tok::kw___global:
5338 case tok::kw___constant:
5339 case tok::kw___generic:
5340 case tok::kw___read_only:
5341 case tok::kw___read_write:
5342 case tok::kw___write_only:
5343 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
5344 #include "clang/Basic/OpenCLImageTypes.def"
5345
5346 return true;
5347
5348 case tok::kw_private:
5349 return getLangOpts().OpenCL;
5350 }
5351 }
5352
isConstructorDeclarator(bool IsUnqualified,bool DeductionGuide)5353 bool Parser::isConstructorDeclarator(bool IsUnqualified, bool DeductionGuide) {
5354 TentativeParsingAction TPA(*this);
5355
5356 // Parse the C++ scope specifier.
5357 CXXScopeSpec SS;
5358 if (ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
5359 /*ObjectHadErrors=*/false,
5360 /*EnteringContext=*/true)) {
5361 TPA.Revert();
5362 return false;
5363 }
5364
5365 // Parse the constructor name.
5366 if (Tok.is(tok::identifier)) {
5367 // We already know that we have a constructor name; just consume
5368 // the token.
5369 ConsumeToken();
5370 } else if (Tok.is(tok::annot_template_id)) {
5371 ConsumeAnnotationToken();
5372 } else {
5373 TPA.Revert();
5374 return false;
5375 }
5376
5377 // There may be attributes here, appertaining to the constructor name or type
5378 // we just stepped past.
5379 SkipCXX11Attributes();
5380
5381 // Current class name must be followed by a left parenthesis.
5382 if (Tok.isNot(tok::l_paren)) {
5383 TPA.Revert();
5384 return false;
5385 }
5386 ConsumeParen();
5387
5388 // A right parenthesis, or ellipsis followed by a right parenthesis signals
5389 // that we have a constructor.
5390 if (Tok.is(tok::r_paren) ||
5391 (Tok.is(tok::ellipsis) && NextToken().is(tok::r_paren))) {
5392 TPA.Revert();
5393 return true;
5394 }
5395
5396 // A C++11 attribute here signals that we have a constructor, and is an
5397 // attribute on the first constructor parameter.
5398 if (getLangOpts().CPlusPlus11 &&
5399 isCXX11AttributeSpecifier(/*Disambiguate*/ false,
5400 /*OuterMightBeMessageSend*/ true)) {
5401 TPA.Revert();
5402 return true;
5403 }
5404
5405 // If we need to, enter the specified scope.
5406 DeclaratorScopeObj DeclScopeObj(*this, SS);
5407 if (SS.isSet() && Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
5408 DeclScopeObj.EnterDeclaratorScope();
5409
5410 // Optionally skip Microsoft attributes.
5411 ParsedAttributes Attrs(AttrFactory);
5412 MaybeParseMicrosoftAttributes(Attrs);
5413
5414 // Check whether the next token(s) are part of a declaration
5415 // specifier, in which case we have the start of a parameter and,
5416 // therefore, we know that this is a constructor.
5417 bool IsConstructor = false;
5418 if (isDeclarationSpecifier())
5419 IsConstructor = true;
5420 else if (Tok.is(tok::identifier) ||
5421 (Tok.is(tok::annot_cxxscope) && NextToken().is(tok::identifier))) {
5422 // We've seen "C ( X" or "C ( X::Y", but "X" / "X::Y" is not a type.
5423 // This might be a parenthesized member name, but is more likely to
5424 // be a constructor declaration with an invalid argument type. Keep
5425 // looking.
5426 if (Tok.is(tok::annot_cxxscope))
5427 ConsumeAnnotationToken();
5428 ConsumeToken();
5429
5430 // If this is not a constructor, we must be parsing a declarator,
5431 // which must have one of the following syntactic forms (see the
5432 // grammar extract at the start of ParseDirectDeclarator):
5433 switch (Tok.getKind()) {
5434 case tok::l_paren:
5435 // C(X ( int));
5436 case tok::l_square:
5437 // C(X [ 5]);
5438 // C(X [ [attribute]]);
5439 case tok::coloncolon:
5440 // C(X :: Y);
5441 // C(X :: *p);
5442 // Assume this isn't a constructor, rather than assuming it's a
5443 // constructor with an unnamed parameter of an ill-formed type.
5444 break;
5445
5446 case tok::r_paren:
5447 // C(X )
5448
5449 // Skip past the right-paren and any following attributes to get to
5450 // the function body or trailing-return-type.
5451 ConsumeParen();
5452 SkipCXX11Attributes();
5453
5454 if (DeductionGuide) {
5455 // C(X) -> ... is a deduction guide.
5456 IsConstructor = Tok.is(tok::arrow);
5457 break;
5458 }
5459 if (Tok.is(tok::colon) || Tok.is(tok::kw_try)) {
5460 // Assume these were meant to be constructors:
5461 // C(X) : (the name of a bit-field cannot be parenthesized).
5462 // C(X) try (this is otherwise ill-formed).
5463 IsConstructor = true;
5464 }
5465 if (Tok.is(tok::semi) || Tok.is(tok::l_brace)) {
5466 // If we have a constructor name within the class definition,
5467 // assume these were meant to be constructors:
5468 // C(X) {
5469 // C(X) ;
5470 // ... because otherwise we would be declaring a non-static data
5471 // member that is ill-formed because it's of the same type as its
5472 // surrounding class.
5473 //
5474 // FIXME: We can actually do this whether or not the name is qualified,
5475 // because if it is qualified in this context it must be being used as
5476 // a constructor name.
5477 // currently, so we're somewhat conservative here.
5478 IsConstructor = IsUnqualified;
5479 }
5480 break;
5481
5482 default:
5483 IsConstructor = true;
5484 break;
5485 }
5486 }
5487
5488 TPA.Revert();
5489 return IsConstructor;
5490 }
5491
5492 /// ParseTypeQualifierListOpt
5493 /// type-qualifier-list: [C99 6.7.5]
5494 /// type-qualifier
5495 /// [vendor] attributes
5496 /// [ only if AttrReqs & AR_VendorAttributesParsed ]
5497 /// type-qualifier-list type-qualifier
5498 /// [vendor] type-qualifier-list attributes
5499 /// [ only if AttrReqs & AR_VendorAttributesParsed ]
5500 /// [C++0x] attribute-specifier[opt] is allowed before cv-qualifier-seq
5501 /// [ only if AttReqs & AR_CXX11AttributesParsed ]
5502 /// Note: vendor can be GNU, MS, etc and can be explicitly controlled via
5503 /// AttrRequirements bitmask values.
ParseTypeQualifierListOpt(DeclSpec & DS,unsigned AttrReqs,bool AtomicAllowed,bool IdentifierRequired,Optional<llvm::function_ref<void ()>> CodeCompletionHandler)5504 void Parser::ParseTypeQualifierListOpt(
5505 DeclSpec &DS, unsigned AttrReqs, bool AtomicAllowed,
5506 bool IdentifierRequired,
5507 Optional<llvm::function_ref<void()>> CodeCompletionHandler) {
5508 if (standardAttributesAllowed() && (AttrReqs & AR_CXX11AttributesParsed) &&
5509 isCXX11AttributeSpecifier()) {
5510 ParsedAttributesWithRange attrs(AttrFactory);
5511 ParseCXX11Attributes(attrs);
5512 DS.takeAttributesFrom(attrs);
5513 }
5514
5515 SourceLocation EndLoc;
5516
5517 while (1) {
5518 bool isInvalid = false;
5519 const char *PrevSpec = nullptr;
5520 unsigned DiagID = 0;
5521 SourceLocation Loc = Tok.getLocation();
5522
5523 switch (Tok.getKind()) {
5524 case tok::code_completion:
5525 cutOffParsing();
5526 if (CodeCompletionHandler)
5527 (*CodeCompletionHandler)();
5528 else
5529 Actions.CodeCompleteTypeQualifiers(DS);
5530 return;
5531
5532 case tok::kw_const:
5533 isInvalid = DS.SetTypeQual(DeclSpec::TQ_const , Loc, PrevSpec, DiagID,
5534 getLangOpts());
5535 break;
5536 case tok::kw_volatile:
5537 isInvalid = DS.SetTypeQual(DeclSpec::TQ_volatile, Loc, PrevSpec, DiagID,
5538 getLangOpts());
5539 break;
5540 case tok::kw_restrict:
5541 isInvalid = DS.SetTypeQual(DeclSpec::TQ_restrict, Loc, PrevSpec, DiagID,
5542 getLangOpts());
5543 break;
5544 case tok::kw__Atomic:
5545 if (!AtomicAllowed)
5546 goto DoneWithTypeQuals;
5547 if (!getLangOpts().C11)
5548 Diag(Tok, diag::ext_c11_feature) << Tok.getName();
5549 isInvalid = DS.SetTypeQual(DeclSpec::TQ_atomic, Loc, PrevSpec, DiagID,
5550 getLangOpts());
5551 break;
5552
5553 // OpenCL qualifiers:
5554 case tok::kw_private:
5555 if (!getLangOpts().OpenCL)
5556 goto DoneWithTypeQuals;
5557 LLVM_FALLTHROUGH;
5558 case tok::kw___private:
5559 case tok::kw___global:
5560 case tok::kw___local:
5561 case tok::kw___constant:
5562 case tok::kw___generic:
5563 case tok::kw___read_only:
5564 case tok::kw___write_only:
5565 case tok::kw___read_write:
5566 ParseOpenCLQualifiers(DS.getAttributes());
5567 break;
5568
5569 case tok::kw___unaligned:
5570 isInvalid = DS.SetTypeQual(DeclSpec::TQ_unaligned, Loc, PrevSpec, DiagID,
5571 getLangOpts());
5572 break;
5573 case tok::kw___uptr:
5574 // GNU libc headers in C mode use '__uptr' as an identifier which conflicts
5575 // with the MS modifier keyword.
5576 if ((AttrReqs & AR_DeclspecAttributesParsed) && !getLangOpts().CPlusPlus &&
5577 IdentifierRequired && DS.isEmpty() && NextToken().is(tok::semi)) {
5578 if (TryKeywordIdentFallback(false))
5579 continue;
5580 }
5581 LLVM_FALLTHROUGH;
5582 case tok::kw___sptr:
5583 case tok::kw___w64:
5584 case tok::kw___ptr64:
5585 case tok::kw___ptr32:
5586 case tok::kw___cdecl:
5587 case tok::kw___stdcall:
5588 case tok::kw___fastcall:
5589 case tok::kw___thiscall:
5590 case tok::kw___regcall:
5591 case tok::kw___vectorcall:
5592 if (AttrReqs & AR_DeclspecAttributesParsed) {
5593 ParseMicrosoftTypeAttributes(DS.getAttributes());
5594 continue;
5595 }
5596 goto DoneWithTypeQuals;
5597 case tok::kw___pascal:
5598 if (AttrReqs & AR_VendorAttributesParsed) {
5599 ParseBorlandTypeAttributes(DS.getAttributes());
5600 continue;
5601 }
5602 goto DoneWithTypeQuals;
5603
5604 // Nullability type specifiers.
5605 case tok::kw__Nonnull:
5606 case tok::kw__Nullable:
5607 case tok::kw__Nullable_result:
5608 case tok::kw__Null_unspecified:
5609 ParseNullabilityTypeSpecifiers(DS.getAttributes());
5610 continue;
5611
5612 // Objective-C 'kindof' types.
5613 case tok::kw___kindof:
5614 DS.getAttributes().addNew(Tok.getIdentifierInfo(), Loc, nullptr, Loc,
5615 nullptr, 0, ParsedAttr::AS_Keyword);
5616 (void)ConsumeToken();
5617 continue;
5618
5619 case tok::kw___attribute:
5620 if (AttrReqs & AR_GNUAttributesParsedAndRejected)
5621 // When GNU attributes are expressly forbidden, diagnose their usage.
5622 Diag(Tok, diag::err_attributes_not_allowed);
5623
5624 // Parse the attributes even if they are rejected to ensure that error
5625 // recovery is graceful.
5626 if (AttrReqs & AR_GNUAttributesParsed ||
5627 AttrReqs & AR_GNUAttributesParsedAndRejected) {
5628 ParseGNUAttributes(DS.getAttributes());
5629 continue; // do *not* consume the next token!
5630 }
5631 // otherwise, FALL THROUGH!
5632 LLVM_FALLTHROUGH;
5633 default:
5634 DoneWithTypeQuals:
5635 // If this is not a type-qualifier token, we're done reading type
5636 // qualifiers. First verify that DeclSpec's are consistent.
5637 DS.Finish(Actions, Actions.getASTContext().getPrintingPolicy());
5638 if (EndLoc.isValid())
5639 DS.SetRangeEnd(EndLoc);
5640 return;
5641 }
5642
5643 // If the specifier combination wasn't legal, issue a diagnostic.
5644 if (isInvalid) {
5645 assert(PrevSpec && "Method did not return previous specifier!");
5646 Diag(Tok, DiagID) << PrevSpec;
5647 }
5648 EndLoc = ConsumeToken();
5649 }
5650 }
5651
5652 /// ParseDeclarator - Parse and verify a newly-initialized declarator.
5653 ///
ParseDeclarator(Declarator & D)5654 void Parser::ParseDeclarator(Declarator &D) {
5655 /// This implements the 'declarator' production in the C grammar, then checks
5656 /// for well-formedness and issues diagnostics.
5657 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
5658 }
5659
isPtrOperatorToken(tok::TokenKind Kind,const LangOptions & Lang,DeclaratorContext TheContext)5660 static bool isPtrOperatorToken(tok::TokenKind Kind, const LangOptions &Lang,
5661 DeclaratorContext TheContext) {
5662 if (Kind == tok::star || Kind == tok::caret)
5663 return true;
5664
5665 // OpenCL 2.0 and later define this keyword.
5666 if (Kind == tok::kw_pipe &&
5667 ((Lang.OpenCL && Lang.OpenCLVersion >= 200) || Lang.OpenCLCPlusPlus))
5668 return true;
5669
5670 if (!Lang.CPlusPlus)
5671 return false;
5672
5673 if (Kind == tok::amp)
5674 return true;
5675
5676 // We parse rvalue refs in C++03, because otherwise the errors are scary.
5677 // But we must not parse them in conversion-type-ids and new-type-ids, since
5678 // those can be legitimately followed by a && operator.
5679 // (The same thing can in theory happen after a trailing-return-type, but
5680 // since those are a C++11 feature, there is no rejects-valid issue there.)
5681 if (Kind == tok::ampamp)
5682 return Lang.CPlusPlus11 || (TheContext != DeclaratorContext::ConversionId &&
5683 TheContext != DeclaratorContext::CXXNew);
5684
5685 return false;
5686 }
5687
5688 // Indicates whether the given declarator is a pipe declarator.
isPipeDeclerator(const Declarator & D)5689 static bool isPipeDeclerator(const Declarator &D) {
5690 const unsigned NumTypes = D.getNumTypeObjects();
5691
5692 for (unsigned Idx = 0; Idx != NumTypes; ++Idx)
5693 if (DeclaratorChunk::Pipe == D.getTypeObject(Idx).Kind)
5694 return true;
5695
5696 return false;
5697 }
5698
5699 /// ParseDeclaratorInternal - Parse a C or C++ declarator. The direct-declarator
5700 /// is parsed by the function passed to it. Pass null, and the direct-declarator
5701 /// isn't parsed at all, making this function effectively parse the C++
5702 /// ptr-operator production.
5703 ///
5704 /// If the grammar of this construct is extended, matching changes must also be
5705 /// made to TryParseDeclarator and MightBeDeclarator, and possibly to
5706 /// isConstructorDeclarator.
5707 ///
5708 /// declarator: [C99 6.7.5] [C++ 8p4, dcl.decl]
5709 /// [C] pointer[opt] direct-declarator
5710 /// [C++] direct-declarator
5711 /// [C++] ptr-operator declarator
5712 ///
5713 /// pointer: [C99 6.7.5]
5714 /// '*' type-qualifier-list[opt]
5715 /// '*' type-qualifier-list[opt] pointer
5716 ///
5717 /// ptr-operator:
5718 /// '*' cv-qualifier-seq[opt]
5719 /// '&'
5720 /// [C++0x] '&&'
5721 /// [GNU] '&' restrict[opt] attributes[opt]
5722 /// [GNU?] '&&' restrict[opt] attributes[opt]
5723 /// '::'[opt] nested-name-specifier '*' cv-qualifier-seq[opt]
ParseDeclaratorInternal(Declarator & D,DirectDeclParseFunction DirectDeclParser)5724 void Parser::ParseDeclaratorInternal(Declarator &D,
5725 DirectDeclParseFunction DirectDeclParser) {
5726 if (Diags.hasAllExtensionsSilenced())
5727 D.setExtension();
5728
5729 // C++ member pointers start with a '::' or a nested-name.
5730 // Member pointers get special handling, since there's no place for the
5731 // scope spec in the generic path below.
5732 if (getLangOpts().CPlusPlus &&
5733 (Tok.is(tok::coloncolon) || Tok.is(tok::kw_decltype) ||
5734 (Tok.is(tok::identifier) &&
5735 (NextToken().is(tok::coloncolon) || NextToken().is(tok::less))) ||
5736 Tok.is(tok::annot_cxxscope))) {
5737 bool EnteringContext = D.getContext() == DeclaratorContext::File ||
5738 D.getContext() == DeclaratorContext::Member;
5739 CXXScopeSpec SS;
5740 ParseOptionalCXXScopeSpecifier(SS, /*ObjectType=*/nullptr,
5741 /*ObjectHadErrors=*/false, EnteringContext);
5742
5743 if (SS.isNotEmpty()) {
5744 if (Tok.isNot(tok::star)) {
5745 // The scope spec really belongs to the direct-declarator.
5746 if (D.mayHaveIdentifier())
5747 D.getCXXScopeSpec() = SS;
5748 else
5749 AnnotateScopeToken(SS, true);
5750
5751 if (DirectDeclParser)
5752 (this->*DirectDeclParser)(D);
5753 return;
5754 }
5755
5756 if (SS.isValid()) {
5757 checkCompoundToken(SS.getEndLoc(), tok::coloncolon,
5758 CompoundToken::MemberPtr);
5759 }
5760
5761 SourceLocation StarLoc = ConsumeToken();
5762 D.SetRangeEnd(StarLoc);
5763 DeclSpec DS(AttrFactory);
5764 ParseTypeQualifierListOpt(DS);
5765 D.ExtendWithDeclSpec(DS);
5766
5767 // Recurse to parse whatever is left.
5768 ParseDeclaratorInternal(D, DirectDeclParser);
5769
5770 // Sema will have to catch (syntactically invalid) pointers into global
5771 // scope. It has to catch pointers into namespace scope anyway.
5772 D.AddTypeInfo(DeclaratorChunk::getMemberPointer(
5773 SS, DS.getTypeQualifiers(), StarLoc, DS.getEndLoc()),
5774 std::move(DS.getAttributes()),
5775 /* Don't replace range end. */ SourceLocation());
5776 return;
5777 }
5778 }
5779
5780 tok::TokenKind Kind = Tok.getKind();
5781
5782 if (D.getDeclSpec().isTypeSpecPipe() && !isPipeDeclerator(D)) {
5783 DeclSpec DS(AttrFactory);
5784 ParseTypeQualifierListOpt(DS);
5785
5786 D.AddTypeInfo(
5787 DeclaratorChunk::getPipe(DS.getTypeQualifiers(), DS.getPipeLoc()),
5788 std::move(DS.getAttributes()), SourceLocation());
5789 }
5790
5791 // Not a pointer, C++ reference, or block.
5792 if (!isPtrOperatorToken(Kind, getLangOpts(), D.getContext())) {
5793 if (DirectDeclParser)
5794 (this->*DirectDeclParser)(D);
5795 return;
5796 }
5797
5798 // Otherwise, '*' -> pointer, '^' -> block, '&' -> lvalue reference,
5799 // '&&' -> rvalue reference
5800 SourceLocation Loc = ConsumeToken(); // Eat the *, ^, & or &&.
5801 D.SetRangeEnd(Loc);
5802
5803 if (Kind == tok::star || Kind == tok::caret) {
5804 // Is a pointer.
5805 DeclSpec DS(AttrFactory);
5806
5807 // GNU attributes are not allowed here in a new-type-id, but Declspec and
5808 // C++11 attributes are allowed.
5809 unsigned Reqs = AR_CXX11AttributesParsed | AR_DeclspecAttributesParsed |
5810 ((D.getContext() != DeclaratorContext::CXXNew)
5811 ? AR_GNUAttributesParsed
5812 : AR_GNUAttributesParsedAndRejected);
5813 ParseTypeQualifierListOpt(DS, Reqs, true, !D.mayOmitIdentifier());
5814 D.ExtendWithDeclSpec(DS);
5815
5816 // Recursively parse the declarator.
5817 ParseDeclaratorInternal(D, DirectDeclParser);
5818 if (Kind == tok::star)
5819 // Remember that we parsed a pointer type, and remember the type-quals.
5820 D.AddTypeInfo(DeclaratorChunk::getPointer(
5821 DS.getTypeQualifiers(), Loc, DS.getConstSpecLoc(),
5822 DS.getVolatileSpecLoc(), DS.getRestrictSpecLoc(),
5823 DS.getAtomicSpecLoc(), DS.getUnalignedSpecLoc()),
5824 std::move(DS.getAttributes()), SourceLocation());
5825 else
5826 // Remember that we parsed a Block type, and remember the type-quals.
5827 D.AddTypeInfo(
5828 DeclaratorChunk::getBlockPointer(DS.getTypeQualifiers(), Loc),
5829 std::move(DS.getAttributes()), SourceLocation());
5830 } else {
5831 // Is a reference
5832 DeclSpec DS(AttrFactory);
5833
5834 // Complain about rvalue references in C++03, but then go on and build
5835 // the declarator.
5836 if (Kind == tok::ampamp)
5837 Diag(Loc, getLangOpts().CPlusPlus11 ?
5838 diag::warn_cxx98_compat_rvalue_reference :
5839 diag::ext_rvalue_reference);
5840
5841 // GNU-style and C++11 attributes are allowed here, as is restrict.
5842 ParseTypeQualifierListOpt(DS);
5843 D.ExtendWithDeclSpec(DS);
5844
5845 // C++ 8.3.2p1: cv-qualified references are ill-formed except when the
5846 // cv-qualifiers are introduced through the use of a typedef or of a
5847 // template type argument, in which case the cv-qualifiers are ignored.
5848 if (DS.getTypeQualifiers() != DeclSpec::TQ_unspecified) {
5849 if (DS.getTypeQualifiers() & DeclSpec::TQ_const)
5850 Diag(DS.getConstSpecLoc(),
5851 diag::err_invalid_reference_qualifier_application) << "const";
5852 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile)
5853 Diag(DS.getVolatileSpecLoc(),
5854 diag::err_invalid_reference_qualifier_application) << "volatile";
5855 // 'restrict' is permitted as an extension.
5856 if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic)
5857 Diag(DS.getAtomicSpecLoc(),
5858 diag::err_invalid_reference_qualifier_application) << "_Atomic";
5859 }
5860
5861 // Recursively parse the declarator.
5862 ParseDeclaratorInternal(D, DirectDeclParser);
5863
5864 if (D.getNumTypeObjects() > 0) {
5865 // C++ [dcl.ref]p4: There shall be no references to references.
5866 DeclaratorChunk& InnerChunk = D.getTypeObject(D.getNumTypeObjects() - 1);
5867 if (InnerChunk.Kind == DeclaratorChunk::Reference) {
5868 if (const IdentifierInfo *II = D.getIdentifier())
5869 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
5870 << II;
5871 else
5872 Diag(InnerChunk.Loc, diag::err_illegal_decl_reference_to_reference)
5873 << "type name";
5874
5875 // Once we've complained about the reference-to-reference, we
5876 // can go ahead and build the (technically ill-formed)
5877 // declarator: reference collapsing will take care of it.
5878 }
5879 }
5880
5881 // Remember that we parsed a reference type.
5882 D.AddTypeInfo(DeclaratorChunk::getReference(DS.getTypeQualifiers(), Loc,
5883 Kind == tok::amp),
5884 std::move(DS.getAttributes()), SourceLocation());
5885 }
5886 }
5887
5888 // When correcting from misplaced brackets before the identifier, the location
5889 // is saved inside the declarator so that other diagnostic messages can use
5890 // them. This extracts and returns that location, or returns the provided
5891 // location if a stored location does not exist.
getMissingDeclaratorIdLoc(Declarator & D,SourceLocation Loc)5892 static SourceLocation getMissingDeclaratorIdLoc(Declarator &D,
5893 SourceLocation Loc) {
5894 if (D.getName().StartLocation.isInvalid() &&
5895 D.getName().EndLocation.isValid())
5896 return D.getName().EndLocation;
5897
5898 return Loc;
5899 }
5900
5901 /// ParseDirectDeclarator
5902 /// direct-declarator: [C99 6.7.5]
5903 /// [C99] identifier
5904 /// '(' declarator ')'
5905 /// [GNU] '(' attributes declarator ')'
5906 /// [C90] direct-declarator '[' constant-expression[opt] ']'
5907 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
5908 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
5909 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
5910 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
5911 /// [C++11] direct-declarator '[' constant-expression[opt] ']'
5912 /// attribute-specifier-seq[opt]
5913 /// direct-declarator '(' parameter-type-list ')'
5914 /// direct-declarator '(' identifier-list[opt] ')'
5915 /// [GNU] direct-declarator '(' parameter-forward-declarations
5916 /// parameter-type-list[opt] ')'
5917 /// [C++] direct-declarator '(' parameter-declaration-clause ')'
5918 /// cv-qualifier-seq[opt] exception-specification[opt]
5919 /// [C++11] direct-declarator '(' parameter-declaration-clause ')'
5920 /// attribute-specifier-seq[opt] cv-qualifier-seq[opt]
5921 /// ref-qualifier[opt] exception-specification[opt]
5922 /// [C++] declarator-id
5923 /// [C++11] declarator-id attribute-specifier-seq[opt]
5924 ///
5925 /// declarator-id: [C++ 8]
5926 /// '...'[opt] id-expression
5927 /// '::'[opt] nested-name-specifier[opt] type-name
5928 ///
5929 /// id-expression: [C++ 5.1]
5930 /// unqualified-id
5931 /// qualified-id
5932 ///
5933 /// unqualified-id: [C++ 5.1]
5934 /// identifier
5935 /// operator-function-id
5936 /// conversion-function-id
5937 /// '~' class-name
5938 /// template-id
5939 ///
5940 /// C++17 adds the following, which we also handle here:
5941 ///
5942 /// simple-declaration:
5943 /// <decl-spec> '[' identifier-list ']' brace-or-equal-initializer ';'
5944 ///
5945 /// Note, any additional constructs added here may need corresponding changes
5946 /// in isConstructorDeclarator.
ParseDirectDeclarator(Declarator & D)5947 void Parser::ParseDirectDeclarator(Declarator &D) {
5948 DeclaratorScopeObj DeclScopeObj(*this, D.getCXXScopeSpec());
5949
5950 if (getLangOpts().CPlusPlus && D.mayHaveIdentifier()) {
5951 // This might be a C++17 structured binding.
5952 if (Tok.is(tok::l_square) && !D.mayOmitIdentifier() &&
5953 D.getCXXScopeSpec().isEmpty())
5954 return ParseDecompositionDeclarator(D);
5955
5956 // Don't parse FOO:BAR as if it were a typo for FOO::BAR inside a class, in
5957 // this context it is a bitfield. Also in range-based for statement colon
5958 // may delimit for-range-declaration.
5959 ColonProtectionRAIIObject X(
5960 *this, D.getContext() == DeclaratorContext::Member ||
5961 (D.getContext() == DeclaratorContext::ForInit &&
5962 getLangOpts().CPlusPlus11));
5963
5964 // ParseDeclaratorInternal might already have parsed the scope.
5965 if (D.getCXXScopeSpec().isEmpty()) {
5966 bool EnteringContext = D.getContext() == DeclaratorContext::File ||
5967 D.getContext() == DeclaratorContext::Member;
5968 ParseOptionalCXXScopeSpecifier(
5969 D.getCXXScopeSpec(), /*ObjectType=*/nullptr,
5970 /*ObjectHadErrors=*/false, EnteringContext);
5971 }
5972
5973 if (D.getCXXScopeSpec().isValid()) {
5974 if (Actions.ShouldEnterDeclaratorScope(getCurScope(),
5975 D.getCXXScopeSpec()))
5976 // Change the declaration context for name lookup, until this function
5977 // is exited (and the declarator has been parsed).
5978 DeclScopeObj.EnterDeclaratorScope();
5979 else if (getObjCDeclContext()) {
5980 // Ensure that we don't interpret the next token as an identifier when
5981 // dealing with declarations in an Objective-C container.
5982 D.SetIdentifier(nullptr, Tok.getLocation());
5983 D.setInvalidType(true);
5984 ConsumeToken();
5985 goto PastIdentifier;
5986 }
5987 }
5988
5989 // C++0x [dcl.fct]p14:
5990 // There is a syntactic ambiguity when an ellipsis occurs at the end of a
5991 // parameter-declaration-clause without a preceding comma. In this case,
5992 // the ellipsis is parsed as part of the abstract-declarator if the type
5993 // of the parameter either names a template parameter pack that has not
5994 // been expanded or contains auto; otherwise, it is parsed as part of the
5995 // parameter-declaration-clause.
5996 if (Tok.is(tok::ellipsis) && D.getCXXScopeSpec().isEmpty() &&
5997 !((D.getContext() == DeclaratorContext::Prototype ||
5998 D.getContext() == DeclaratorContext::LambdaExprParameter ||
5999 D.getContext() == DeclaratorContext::BlockLiteral) &&
6000 NextToken().is(tok::r_paren) && !D.hasGroupingParens() &&
6001 !Actions.containsUnexpandedParameterPacks(D) &&
6002 D.getDeclSpec().getTypeSpecType() != TST_auto)) {
6003 SourceLocation EllipsisLoc = ConsumeToken();
6004 if (isPtrOperatorToken(Tok.getKind(), getLangOpts(), D.getContext())) {
6005 // The ellipsis was put in the wrong place. Recover, and explain to
6006 // the user what they should have done.
6007 ParseDeclarator(D);
6008 if (EllipsisLoc.isValid())
6009 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
6010 return;
6011 } else
6012 D.setEllipsisLoc(EllipsisLoc);
6013
6014 // The ellipsis can't be followed by a parenthesized declarator. We
6015 // check for that in ParseParenDeclarator, after we have disambiguated
6016 // the l_paren token.
6017 }
6018
6019 if (Tok.isOneOf(tok::identifier, tok::kw_operator, tok::annot_template_id,
6020 tok::tilde)) {
6021 // We found something that indicates the start of an unqualified-id.
6022 // Parse that unqualified-id.
6023 bool AllowConstructorName;
6024 bool AllowDeductionGuide;
6025 if (D.getDeclSpec().hasTypeSpecifier()) {
6026 AllowConstructorName = false;
6027 AllowDeductionGuide = false;
6028 } else if (D.getCXXScopeSpec().isSet()) {
6029 AllowConstructorName = (D.getContext() == DeclaratorContext::File ||
6030 D.getContext() == DeclaratorContext::Member);
6031 AllowDeductionGuide = false;
6032 } else {
6033 AllowConstructorName = (D.getContext() == DeclaratorContext::Member);
6034 AllowDeductionGuide = (D.getContext() == DeclaratorContext::File ||
6035 D.getContext() == DeclaratorContext::Member);
6036 }
6037
6038 bool HadScope = D.getCXXScopeSpec().isValid();
6039 if (ParseUnqualifiedId(D.getCXXScopeSpec(),
6040 /*ObjectType=*/nullptr,
6041 /*ObjectHadErrors=*/false,
6042 /*EnteringContext=*/true,
6043 /*AllowDestructorName=*/true, AllowConstructorName,
6044 AllowDeductionGuide, nullptr, D.getName()) ||
6045 // Once we're past the identifier, if the scope was bad, mark the
6046 // whole declarator bad.
6047 D.getCXXScopeSpec().isInvalid()) {
6048 D.SetIdentifier(nullptr, Tok.getLocation());
6049 D.setInvalidType(true);
6050 } else {
6051 // ParseUnqualifiedId might have parsed a scope specifier during error
6052 // recovery. If it did so, enter that scope.
6053 if (!HadScope && D.getCXXScopeSpec().isValid() &&
6054 Actions.ShouldEnterDeclaratorScope(getCurScope(),
6055 D.getCXXScopeSpec()))
6056 DeclScopeObj.EnterDeclaratorScope();
6057
6058 // Parsed the unqualified-id; update range information and move along.
6059 if (D.getSourceRange().getBegin().isInvalid())
6060 D.SetRangeBegin(D.getName().getSourceRange().getBegin());
6061 D.SetRangeEnd(D.getName().getSourceRange().getEnd());
6062 }
6063 goto PastIdentifier;
6064 }
6065
6066 if (D.getCXXScopeSpec().isNotEmpty()) {
6067 // We have a scope specifier but no following unqualified-id.
6068 Diag(PP.getLocForEndOfToken(D.getCXXScopeSpec().getEndLoc()),
6069 diag::err_expected_unqualified_id)
6070 << /*C++*/1;
6071 D.SetIdentifier(nullptr, Tok.getLocation());
6072 goto PastIdentifier;
6073 }
6074 } else if (Tok.is(tok::identifier) && D.mayHaveIdentifier()) {
6075 assert(!getLangOpts().CPlusPlus &&
6076 "There's a C++-specific check for tok::identifier above");
6077 assert(Tok.getIdentifierInfo() && "Not an identifier?");
6078 D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
6079 D.SetRangeEnd(Tok.getLocation());
6080 ConsumeToken();
6081 goto PastIdentifier;
6082 } else if (Tok.is(tok::identifier) && !D.mayHaveIdentifier()) {
6083 // We're not allowed an identifier here, but we got one. Try to figure out
6084 // if the user was trying to attach a name to the type, or whether the name
6085 // is some unrelated trailing syntax.
6086 bool DiagnoseIdentifier = false;
6087 if (D.hasGroupingParens())
6088 // An identifier within parens is unlikely to be intended to be anything
6089 // other than a name being "declared".
6090 DiagnoseIdentifier = true;
6091 else if (D.getContext() == DeclaratorContext::TemplateArg)
6092 // T<int N> is an accidental identifier; T<int N indicates a missing '>'.
6093 DiagnoseIdentifier =
6094 NextToken().isOneOf(tok::comma, tok::greater, tok::greatergreater);
6095 else if (D.getContext() == DeclaratorContext::AliasDecl ||
6096 D.getContext() == DeclaratorContext::AliasTemplate)
6097 // The most likely error is that the ';' was forgotten.
6098 DiagnoseIdentifier = NextToken().isOneOf(tok::comma, tok::semi);
6099 else if ((D.getContext() == DeclaratorContext::TrailingReturn ||
6100 D.getContext() == DeclaratorContext::TrailingReturnVar) &&
6101 !isCXX11VirtSpecifier(Tok))
6102 DiagnoseIdentifier = NextToken().isOneOf(
6103 tok::comma, tok::semi, tok::equal, tok::l_brace, tok::kw_try);
6104 if (DiagnoseIdentifier) {
6105 Diag(Tok.getLocation(), diag::err_unexpected_unqualified_id)
6106 << FixItHint::CreateRemoval(Tok.getLocation());
6107 D.SetIdentifier(nullptr, Tok.getLocation());
6108 ConsumeToken();
6109 goto PastIdentifier;
6110 }
6111 }
6112
6113 if (Tok.is(tok::l_paren)) {
6114 // If this might be an abstract-declarator followed by a direct-initializer,
6115 // check whether this is a valid declarator chunk. If it can't be, assume
6116 // that it's an initializer instead.
6117 if (D.mayOmitIdentifier() && D.mayBeFollowedByCXXDirectInit()) {
6118 RevertingTentativeParsingAction PA(*this);
6119 if (TryParseDeclarator(true, D.mayHaveIdentifier(), true) ==
6120 TPResult::False) {
6121 D.SetIdentifier(nullptr, Tok.getLocation());
6122 goto PastIdentifier;
6123 }
6124 }
6125
6126 // direct-declarator: '(' declarator ')'
6127 // direct-declarator: '(' attributes declarator ')'
6128 // Example: 'char (*X)' or 'int (*XX)(void)'
6129 ParseParenDeclarator(D);
6130
6131 // If the declarator was parenthesized, we entered the declarator
6132 // scope when parsing the parenthesized declarator, then exited
6133 // the scope already. Re-enter the scope, if we need to.
6134 if (D.getCXXScopeSpec().isSet()) {
6135 // If there was an error parsing parenthesized declarator, declarator
6136 // scope may have been entered before. Don't do it again.
6137 if (!D.isInvalidType() &&
6138 Actions.ShouldEnterDeclaratorScope(getCurScope(),
6139 D.getCXXScopeSpec()))
6140 // Change the declaration context for name lookup, until this function
6141 // is exited (and the declarator has been parsed).
6142 DeclScopeObj.EnterDeclaratorScope();
6143 }
6144 } else if (D.mayOmitIdentifier()) {
6145 // This could be something simple like "int" (in which case the declarator
6146 // portion is empty), if an abstract-declarator is allowed.
6147 D.SetIdentifier(nullptr, Tok.getLocation());
6148
6149 // The grammar for abstract-pack-declarator does not allow grouping parens.
6150 // FIXME: Revisit this once core issue 1488 is resolved.
6151 if (D.hasEllipsis() && D.hasGroupingParens())
6152 Diag(PP.getLocForEndOfToken(D.getEllipsisLoc()),
6153 diag::ext_abstract_pack_declarator_parens);
6154 } else {
6155 if (Tok.getKind() == tok::annot_pragma_parser_crash)
6156 LLVM_BUILTIN_TRAP;
6157 if (Tok.is(tok::l_square))
6158 return ParseMisplacedBracketDeclarator(D);
6159 if (D.getContext() == DeclaratorContext::Member) {
6160 // Objective-C++: Detect C++ keywords and try to prevent further errors by
6161 // treating these keyword as valid member names.
6162 if (getLangOpts().ObjC && getLangOpts().CPlusPlus &&
6163 Tok.getIdentifierInfo() &&
6164 Tok.getIdentifierInfo()->isCPlusPlusKeyword(getLangOpts())) {
6165 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6166 diag::err_expected_member_name_or_semi_objcxx_keyword)
6167 << Tok.getIdentifierInfo()
6168 << (D.getDeclSpec().isEmpty() ? SourceRange()
6169 : D.getDeclSpec().getSourceRange());
6170 D.SetIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
6171 D.SetRangeEnd(Tok.getLocation());
6172 ConsumeToken();
6173 goto PastIdentifier;
6174 }
6175 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6176 diag::err_expected_member_name_or_semi)
6177 << (D.getDeclSpec().isEmpty() ? SourceRange()
6178 : D.getDeclSpec().getSourceRange());
6179 } else if (getLangOpts().CPlusPlus) {
6180 if (Tok.isOneOf(tok::period, tok::arrow))
6181 Diag(Tok, diag::err_invalid_operator_on_type) << Tok.is(tok::arrow);
6182 else {
6183 SourceLocation Loc = D.getCXXScopeSpec().getEndLoc();
6184 if (Tok.isAtStartOfLine() && Loc.isValid())
6185 Diag(PP.getLocForEndOfToken(Loc), diag::err_expected_unqualified_id)
6186 << getLangOpts().CPlusPlus;
6187 else
6188 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6189 diag::err_expected_unqualified_id)
6190 << getLangOpts().CPlusPlus;
6191 }
6192 } else {
6193 Diag(getMissingDeclaratorIdLoc(D, Tok.getLocation()),
6194 diag::err_expected_either)
6195 << tok::identifier << tok::l_paren;
6196 }
6197 D.SetIdentifier(nullptr, Tok.getLocation());
6198 D.setInvalidType(true);
6199 }
6200
6201 PastIdentifier:
6202 assert(D.isPastIdentifier() &&
6203 "Haven't past the location of the identifier yet?");
6204
6205 // Don't parse attributes unless we have parsed an unparenthesized name.
6206 if (D.hasName() && !D.getNumTypeObjects())
6207 MaybeParseCXX11Attributes(D);
6208
6209 while (1) {
6210 if (Tok.is(tok::l_paren)) {
6211 bool IsFunctionDeclaration = D.isFunctionDeclaratorAFunctionDeclaration();
6212 // Enter function-declaration scope, limiting any declarators to the
6213 // function prototype scope, including parameter declarators.
6214 ParseScope PrototypeScope(this,
6215 Scope::FunctionPrototypeScope|Scope::DeclScope|
6216 (IsFunctionDeclaration
6217 ? Scope::FunctionDeclarationScope : 0));
6218
6219 // The paren may be part of a C++ direct initializer, eg. "int x(1);".
6220 // In such a case, check if we actually have a function declarator; if it
6221 // is not, the declarator has been fully parsed.
6222 bool IsAmbiguous = false;
6223 if (getLangOpts().CPlusPlus && D.mayBeFollowedByCXXDirectInit()) {
6224 // The name of the declarator, if any, is tentatively declared within
6225 // a possible direct initializer.
6226 TentativelyDeclaredIdentifiers.push_back(D.getIdentifier());
6227 bool IsFunctionDecl = isCXXFunctionDeclarator(&IsAmbiguous);
6228 TentativelyDeclaredIdentifiers.pop_back();
6229 if (!IsFunctionDecl)
6230 break;
6231 }
6232 ParsedAttributes attrs(AttrFactory);
6233 BalancedDelimiterTracker T(*this, tok::l_paren);
6234 T.consumeOpen();
6235 if (IsFunctionDeclaration)
6236 Actions.ActOnStartFunctionDeclarationDeclarator(D,
6237 TemplateParameterDepth);
6238 ParseFunctionDeclarator(D, attrs, T, IsAmbiguous);
6239 if (IsFunctionDeclaration)
6240 Actions.ActOnFinishFunctionDeclarationDeclarator(D);
6241 PrototypeScope.Exit();
6242 } else if (Tok.is(tok::l_square)) {
6243 ParseBracketDeclarator(D);
6244 } else if (Tok.is(tok::kw_requires) && D.hasGroupingParens()) {
6245 // This declarator is declaring a function, but the requires clause is
6246 // in the wrong place:
6247 // void (f() requires true);
6248 // instead of
6249 // void f() requires true;
6250 // or
6251 // void (f()) requires true;
6252 Diag(Tok, diag::err_requires_clause_inside_parens);
6253 ConsumeToken();
6254 ExprResult TrailingRequiresClause = Actions.CorrectDelayedTyposInExpr(
6255 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true));
6256 if (TrailingRequiresClause.isUsable() && D.isFunctionDeclarator() &&
6257 !D.hasTrailingRequiresClause())
6258 // We're already ill-formed if we got here but we'll accept it anyway.
6259 D.setTrailingRequiresClause(TrailingRequiresClause.get());
6260 } else {
6261 break;
6262 }
6263 }
6264 }
6265
ParseDecompositionDeclarator(Declarator & D)6266 void Parser::ParseDecompositionDeclarator(Declarator &D) {
6267 assert(Tok.is(tok::l_square));
6268
6269 // If this doesn't look like a structured binding, maybe it's a misplaced
6270 // array declarator.
6271 // FIXME: Consume the l_square first so we don't need extra lookahead for
6272 // this.
6273 if (!(NextToken().is(tok::identifier) &&
6274 GetLookAheadToken(2).isOneOf(tok::comma, tok::r_square)) &&
6275 !(NextToken().is(tok::r_square) &&
6276 GetLookAheadToken(2).isOneOf(tok::equal, tok::l_brace)))
6277 return ParseMisplacedBracketDeclarator(D);
6278
6279 BalancedDelimiterTracker T(*this, tok::l_square);
6280 T.consumeOpen();
6281
6282 SmallVector<DecompositionDeclarator::Binding, 32> Bindings;
6283 while (Tok.isNot(tok::r_square)) {
6284 if (!Bindings.empty()) {
6285 if (Tok.is(tok::comma))
6286 ConsumeToken();
6287 else {
6288 if (Tok.is(tok::identifier)) {
6289 SourceLocation EndLoc = getEndOfPreviousToken();
6290 Diag(EndLoc, diag::err_expected)
6291 << tok::comma << FixItHint::CreateInsertion(EndLoc, ",");
6292 } else {
6293 Diag(Tok, diag::err_expected_comma_or_rsquare);
6294 }
6295
6296 SkipUntil(tok::r_square, tok::comma, tok::identifier,
6297 StopAtSemi | StopBeforeMatch);
6298 if (Tok.is(tok::comma))
6299 ConsumeToken();
6300 else if (Tok.isNot(tok::identifier))
6301 break;
6302 }
6303 }
6304
6305 if (Tok.isNot(tok::identifier)) {
6306 Diag(Tok, diag::err_expected) << tok::identifier;
6307 break;
6308 }
6309
6310 Bindings.push_back({Tok.getIdentifierInfo(), Tok.getLocation()});
6311 ConsumeToken();
6312 }
6313
6314 if (Tok.isNot(tok::r_square))
6315 // We've already diagnosed a problem here.
6316 T.skipToEnd();
6317 else {
6318 // C++17 does not allow the identifier-list in a structured binding
6319 // to be empty.
6320 if (Bindings.empty())
6321 Diag(Tok.getLocation(), diag::ext_decomp_decl_empty);
6322
6323 T.consumeClose();
6324 }
6325
6326 return D.setDecompositionBindings(T.getOpenLocation(), Bindings,
6327 T.getCloseLocation());
6328 }
6329
6330 /// ParseParenDeclarator - We parsed the declarator D up to a paren. This is
6331 /// only called before the identifier, so these are most likely just grouping
6332 /// parens for precedence. If we find that these are actually function
6333 /// parameter parens in an abstract-declarator, we call ParseFunctionDeclarator.
6334 ///
6335 /// direct-declarator:
6336 /// '(' declarator ')'
6337 /// [GNU] '(' attributes declarator ')'
6338 /// direct-declarator '(' parameter-type-list ')'
6339 /// direct-declarator '(' identifier-list[opt] ')'
6340 /// [GNU] direct-declarator '(' parameter-forward-declarations
6341 /// parameter-type-list[opt] ')'
6342 ///
ParseParenDeclarator(Declarator & D)6343 void Parser::ParseParenDeclarator(Declarator &D) {
6344 BalancedDelimiterTracker T(*this, tok::l_paren);
6345 T.consumeOpen();
6346
6347 assert(!D.isPastIdentifier() && "Should be called before passing identifier");
6348
6349 // Eat any attributes before we look at whether this is a grouping or function
6350 // declarator paren. If this is a grouping paren, the attribute applies to
6351 // the type being built up, for example:
6352 // int (__attribute__(()) *x)(long y)
6353 // If this ends up not being a grouping paren, the attribute applies to the
6354 // first argument, for example:
6355 // int (__attribute__(()) int x)
6356 // In either case, we need to eat any attributes to be able to determine what
6357 // sort of paren this is.
6358 //
6359 ParsedAttributes attrs(AttrFactory);
6360 bool RequiresArg = false;
6361 if (Tok.is(tok::kw___attribute)) {
6362 ParseGNUAttributes(attrs);
6363
6364 // We require that the argument list (if this is a non-grouping paren) be
6365 // present even if the attribute list was empty.
6366 RequiresArg = true;
6367 }
6368
6369 // Eat any Microsoft extensions.
6370 ParseMicrosoftTypeAttributes(attrs);
6371
6372 // Eat any Borland extensions.
6373 if (Tok.is(tok::kw___pascal))
6374 ParseBorlandTypeAttributes(attrs);
6375
6376 // If we haven't past the identifier yet (or where the identifier would be
6377 // stored, if this is an abstract declarator), then this is probably just
6378 // grouping parens. However, if this could be an abstract-declarator, then
6379 // this could also be the start of function arguments (consider 'void()').
6380 bool isGrouping;
6381
6382 if (!D.mayOmitIdentifier()) {
6383 // If this can't be an abstract-declarator, this *must* be a grouping
6384 // paren, because we haven't seen the identifier yet.
6385 isGrouping = true;
6386 } else if (Tok.is(tok::r_paren) || // 'int()' is a function.
6387 (getLangOpts().CPlusPlus && Tok.is(tok::ellipsis) &&
6388 NextToken().is(tok::r_paren)) || // C++ int(...)
6389 isDeclarationSpecifier() || // 'int(int)' is a function.
6390 isCXX11AttributeSpecifier()) { // 'int([[]]int)' is a function.
6391 // This handles C99 6.7.5.3p11: in "typedef int X; void foo(X)", X is
6392 // considered to be a type, not a K&R identifier-list.
6393 isGrouping = false;
6394 } else {
6395 // Otherwise, this is a grouping paren, e.g. 'int (*X)' or 'int(X)'.
6396 isGrouping = true;
6397 }
6398
6399 // If this is a grouping paren, handle:
6400 // direct-declarator: '(' declarator ')'
6401 // direct-declarator: '(' attributes declarator ')'
6402 if (isGrouping) {
6403 SourceLocation EllipsisLoc = D.getEllipsisLoc();
6404 D.setEllipsisLoc(SourceLocation());
6405
6406 bool hadGroupingParens = D.hasGroupingParens();
6407 D.setGroupingParens(true);
6408 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
6409 // Match the ')'.
6410 T.consumeClose();
6411 D.AddTypeInfo(
6412 DeclaratorChunk::getParen(T.getOpenLocation(), T.getCloseLocation()),
6413 std::move(attrs), T.getCloseLocation());
6414
6415 D.setGroupingParens(hadGroupingParens);
6416
6417 // An ellipsis cannot be placed outside parentheses.
6418 if (EllipsisLoc.isValid())
6419 DiagnoseMisplacedEllipsisInDeclarator(EllipsisLoc, D);
6420
6421 return;
6422 }
6423
6424 // Okay, if this wasn't a grouping paren, it must be the start of a function
6425 // argument list. Recognize that this declarator will never have an
6426 // identifier (and remember where it would have been), then call into
6427 // ParseFunctionDeclarator to handle of argument list.
6428 D.SetIdentifier(nullptr, Tok.getLocation());
6429
6430 // Enter function-declaration scope, limiting any declarators to the
6431 // function prototype scope, including parameter declarators.
6432 ParseScope PrototypeScope(this,
6433 Scope::FunctionPrototypeScope | Scope::DeclScope |
6434 (D.isFunctionDeclaratorAFunctionDeclaration()
6435 ? Scope::FunctionDeclarationScope : 0));
6436 ParseFunctionDeclarator(D, attrs, T, false, RequiresArg);
6437 PrototypeScope.Exit();
6438 }
6439
InitCXXThisScopeForDeclaratorIfRelevant(const Declarator & D,const DeclSpec & DS,llvm::Optional<Sema::CXXThisScopeRAII> & ThisScope)6440 void Parser::InitCXXThisScopeForDeclaratorIfRelevant(
6441 const Declarator &D, const DeclSpec &DS,
6442 llvm::Optional<Sema::CXXThisScopeRAII> &ThisScope) {
6443 // C++11 [expr.prim.general]p3:
6444 // If a declaration declares a member function or member function
6445 // template of a class X, the expression this is a prvalue of type
6446 // "pointer to cv-qualifier-seq X" between the optional cv-qualifer-seq
6447 // and the end of the function-definition, member-declarator, or
6448 // declarator.
6449 // FIXME: currently, "static" case isn't handled correctly.
6450 bool IsCXX11MemberFunction =
6451 getLangOpts().CPlusPlus11 &&
6452 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&
6453 (D.getContext() == DeclaratorContext::Member
6454 ? !D.getDeclSpec().isFriendSpecified()
6455 : D.getContext() == DeclaratorContext::File &&
6456 D.getCXXScopeSpec().isValid() &&
6457 Actions.CurContext->isRecord());
6458 if (!IsCXX11MemberFunction)
6459 return;
6460
6461 Qualifiers Q = Qualifiers::fromCVRUMask(DS.getTypeQualifiers());
6462 if (D.getDeclSpec().hasConstexprSpecifier() && !getLangOpts().CPlusPlus14)
6463 Q.addConst();
6464 // FIXME: Collect C++ address spaces.
6465 // If there are multiple different address spaces, the source is invalid.
6466 // Carry on using the first addr space for the qualifiers of 'this'.
6467 // The diagnostic will be given later while creating the function
6468 // prototype for the method.
6469 if (getLangOpts().OpenCLCPlusPlus) {
6470 for (ParsedAttr &attr : DS.getAttributes()) {
6471 LangAS ASIdx = attr.asOpenCLLangAS();
6472 if (ASIdx != LangAS::Default) {
6473 Q.addAddressSpace(ASIdx);
6474 break;
6475 }
6476 }
6477 }
6478 ThisScope.emplace(Actions, dyn_cast<CXXRecordDecl>(Actions.CurContext), Q,
6479 IsCXX11MemberFunction);
6480 }
6481
6482 /// ParseFunctionDeclarator - We are after the identifier and have parsed the
6483 /// declarator D up to a paren, which indicates that we are parsing function
6484 /// arguments.
6485 ///
6486 /// If FirstArgAttrs is non-null, then the caller parsed those arguments
6487 /// immediately after the open paren - they should be considered to be the
6488 /// first argument of a parameter.
6489 ///
6490 /// If RequiresArg is true, then the first argument of the function is required
6491 /// to be present and required to not be an identifier list.
6492 ///
6493 /// For C++, after the parameter-list, it also parses the cv-qualifier-seq[opt],
6494 /// (C++11) ref-qualifier[opt], exception-specification[opt],
6495 /// (C++11) attribute-specifier-seq[opt], (C++11) trailing-return-type[opt] and
6496 /// (C++2a) the trailing requires-clause.
6497 ///
6498 /// [C++11] exception-specification:
6499 /// dynamic-exception-specification
6500 /// noexcept-specification
6501 ///
ParseFunctionDeclarator(Declarator & D,ParsedAttributes & FirstArgAttrs,BalancedDelimiterTracker & Tracker,bool IsAmbiguous,bool RequiresArg)6502 void Parser::ParseFunctionDeclarator(Declarator &D,
6503 ParsedAttributes &FirstArgAttrs,
6504 BalancedDelimiterTracker &Tracker,
6505 bool IsAmbiguous,
6506 bool RequiresArg) {
6507 assert(getCurScope()->isFunctionPrototypeScope() &&
6508 "Should call from a Function scope");
6509 // lparen is already consumed!
6510 assert(D.isPastIdentifier() && "Should not call before identifier!");
6511
6512 // This should be true when the function has typed arguments.
6513 // Otherwise, it is treated as a K&R-style function.
6514 bool HasProto = false;
6515 // Build up an array of information about the parsed arguments.
6516 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
6517 // Remember where we see an ellipsis, if any.
6518 SourceLocation EllipsisLoc;
6519
6520 DeclSpec DS(AttrFactory);
6521 bool RefQualifierIsLValueRef = true;
6522 SourceLocation RefQualifierLoc;
6523 ExceptionSpecificationType ESpecType = EST_None;
6524 SourceRange ESpecRange;
6525 SmallVector<ParsedType, 2> DynamicExceptions;
6526 SmallVector<SourceRange, 2> DynamicExceptionRanges;
6527 ExprResult NoexceptExpr;
6528 CachedTokens *ExceptionSpecTokens = nullptr;
6529 ParsedAttributesWithRange FnAttrs(AttrFactory);
6530 TypeResult TrailingReturnType;
6531 SourceLocation TrailingReturnTypeLoc;
6532
6533 /* LocalEndLoc is the end location for the local FunctionTypeLoc.
6534 EndLoc is the end location for the function declarator.
6535 They differ for trailing return types. */
6536 SourceLocation StartLoc, LocalEndLoc, EndLoc;
6537 SourceLocation LParenLoc, RParenLoc;
6538 LParenLoc = Tracker.getOpenLocation();
6539 StartLoc = LParenLoc;
6540
6541 if (isFunctionDeclaratorIdentifierList()) {
6542 if (RequiresArg)
6543 Diag(Tok, diag::err_argument_required_after_attribute);
6544
6545 ParseFunctionDeclaratorIdentifierList(D, ParamInfo);
6546
6547 Tracker.consumeClose();
6548 RParenLoc = Tracker.getCloseLocation();
6549 LocalEndLoc = RParenLoc;
6550 EndLoc = RParenLoc;
6551
6552 // If there are attributes following the identifier list, parse them and
6553 // prohibit them.
6554 MaybeParseCXX11Attributes(FnAttrs);
6555 ProhibitAttributes(FnAttrs);
6556 } else {
6557 if (Tok.isNot(tok::r_paren))
6558 ParseParameterDeclarationClause(D.getContext(), FirstArgAttrs, ParamInfo,
6559 EllipsisLoc);
6560 else if (RequiresArg)
6561 Diag(Tok, diag::err_argument_required_after_attribute);
6562
6563 HasProto = ParamInfo.size() || getLangOpts().CPlusPlus
6564 || getLangOpts().OpenCL;
6565
6566 // If we have the closing ')', eat it.
6567 Tracker.consumeClose();
6568 RParenLoc = Tracker.getCloseLocation();
6569 LocalEndLoc = RParenLoc;
6570 EndLoc = RParenLoc;
6571
6572 if (getLangOpts().CPlusPlus) {
6573 // FIXME: Accept these components in any order, and produce fixits to
6574 // correct the order if the user gets it wrong. Ideally we should deal
6575 // with the pure-specifier in the same way.
6576
6577 // Parse cv-qualifier-seq[opt].
6578 ParseTypeQualifierListOpt(DS, AR_NoAttributesParsed,
6579 /*AtomicAllowed*/ false,
6580 /*IdentifierRequired=*/false,
6581 llvm::function_ref<void()>([&]() {
6582 Actions.CodeCompleteFunctionQualifiers(DS, D);
6583 }));
6584 if (!DS.getSourceRange().getEnd().isInvalid()) {
6585 EndLoc = DS.getSourceRange().getEnd();
6586 }
6587
6588 // Parse ref-qualifier[opt].
6589 if (ParseRefQualifier(RefQualifierIsLValueRef, RefQualifierLoc))
6590 EndLoc = RefQualifierLoc;
6591
6592 llvm::Optional<Sema::CXXThisScopeRAII> ThisScope;
6593 InitCXXThisScopeForDeclaratorIfRelevant(D, DS, ThisScope);
6594
6595 // Parse exception-specification[opt].
6596 // FIXME: Per [class.mem]p6, all exception-specifications at class scope
6597 // should be delayed, including those for non-members (eg, friend
6598 // declarations). But only applying this to member declarations is
6599 // consistent with what other implementations do.
6600 bool Delayed = D.isFirstDeclarationOfMember() &&
6601 D.isFunctionDeclaratorAFunctionDeclaration();
6602 if (Delayed && Actions.isLibstdcxxEagerExceptionSpecHack(D) &&
6603 GetLookAheadToken(0).is(tok::kw_noexcept) &&
6604 GetLookAheadToken(1).is(tok::l_paren) &&
6605 GetLookAheadToken(2).is(tok::kw_noexcept) &&
6606 GetLookAheadToken(3).is(tok::l_paren) &&
6607 GetLookAheadToken(4).is(tok::identifier) &&
6608 GetLookAheadToken(4).getIdentifierInfo()->isStr("swap")) {
6609 // HACK: We've got an exception-specification
6610 // noexcept(noexcept(swap(...)))
6611 // or
6612 // noexcept(noexcept(swap(...)) && noexcept(swap(...)))
6613 // on a 'swap' member function. This is a libstdc++ bug; the lookup
6614 // for 'swap' will only find the function we're currently declaring,
6615 // whereas it expects to find a non-member swap through ADL. Turn off
6616 // delayed parsing to give it a chance to find what it expects.
6617 Delayed = false;
6618 }
6619 ESpecType = tryParseExceptionSpecification(Delayed,
6620 ESpecRange,
6621 DynamicExceptions,
6622 DynamicExceptionRanges,
6623 NoexceptExpr,
6624 ExceptionSpecTokens);
6625 if (ESpecType != EST_None)
6626 EndLoc = ESpecRange.getEnd();
6627
6628 // Parse attribute-specifier-seq[opt]. Per DR 979 and DR 1297, this goes
6629 // after the exception-specification.
6630 MaybeParseCXX11Attributes(FnAttrs);
6631
6632 // Parse trailing-return-type[opt].
6633 LocalEndLoc = EndLoc;
6634 if (getLangOpts().CPlusPlus11 && Tok.is(tok::arrow)) {
6635 Diag(Tok, diag::warn_cxx98_compat_trailing_return_type);
6636 if (D.getDeclSpec().getTypeSpecType() == TST_auto)
6637 StartLoc = D.getDeclSpec().getTypeSpecTypeLoc();
6638 LocalEndLoc = Tok.getLocation();
6639 SourceRange Range;
6640 TrailingReturnType =
6641 ParseTrailingReturnType(Range, D.mayBeFollowedByCXXDirectInit());
6642 TrailingReturnTypeLoc = Range.getBegin();
6643 EndLoc = Range.getEnd();
6644 }
6645 } else if (standardAttributesAllowed()) {
6646 MaybeParseCXX11Attributes(FnAttrs);
6647 }
6648 }
6649
6650 // Collect non-parameter declarations from the prototype if this is a function
6651 // declaration. They will be moved into the scope of the function. Only do
6652 // this in C and not C++, where the decls will continue to live in the
6653 // surrounding context.
6654 SmallVector<NamedDecl *, 0> DeclsInPrototype;
6655 if (getCurScope()->getFlags() & Scope::FunctionDeclarationScope &&
6656 !getLangOpts().CPlusPlus) {
6657 for (Decl *D : getCurScope()->decls()) {
6658 NamedDecl *ND = dyn_cast<NamedDecl>(D);
6659 if (!ND || isa<ParmVarDecl>(ND))
6660 continue;
6661 DeclsInPrototype.push_back(ND);
6662 }
6663 }
6664
6665 // Remember that we parsed a function type, and remember the attributes.
6666 D.AddTypeInfo(DeclaratorChunk::getFunction(
6667 HasProto, IsAmbiguous, LParenLoc, ParamInfo.data(),
6668 ParamInfo.size(), EllipsisLoc, RParenLoc,
6669 RefQualifierIsLValueRef, RefQualifierLoc,
6670 /*MutableLoc=*/SourceLocation(),
6671 ESpecType, ESpecRange, DynamicExceptions.data(),
6672 DynamicExceptionRanges.data(), DynamicExceptions.size(),
6673 NoexceptExpr.isUsable() ? NoexceptExpr.get() : nullptr,
6674 ExceptionSpecTokens, DeclsInPrototype, StartLoc,
6675 LocalEndLoc, D, TrailingReturnType, TrailingReturnTypeLoc,
6676 &DS),
6677 std::move(FnAttrs), EndLoc);
6678 }
6679
6680 /// ParseRefQualifier - Parses a member function ref-qualifier. Returns
6681 /// true if a ref-qualifier is found.
ParseRefQualifier(bool & RefQualifierIsLValueRef,SourceLocation & RefQualifierLoc)6682 bool Parser::ParseRefQualifier(bool &RefQualifierIsLValueRef,
6683 SourceLocation &RefQualifierLoc) {
6684 if (Tok.isOneOf(tok::amp, tok::ampamp)) {
6685 Diag(Tok, getLangOpts().CPlusPlus11 ?
6686 diag::warn_cxx98_compat_ref_qualifier :
6687 diag::ext_ref_qualifier);
6688
6689 RefQualifierIsLValueRef = Tok.is(tok::amp);
6690 RefQualifierLoc = ConsumeToken();
6691 return true;
6692 }
6693 return false;
6694 }
6695
6696 /// isFunctionDeclaratorIdentifierList - This parameter list may have an
6697 /// identifier list form for a K&R-style function: void foo(a,b,c)
6698 ///
6699 /// Note that identifier-lists are only allowed for normal declarators, not for
6700 /// abstract-declarators.
isFunctionDeclaratorIdentifierList()6701 bool Parser::isFunctionDeclaratorIdentifierList() {
6702 return !getLangOpts().CPlusPlus
6703 && Tok.is(tok::identifier)
6704 && !TryAltiVecVectorToken()
6705 // K&R identifier lists can't have typedefs as identifiers, per C99
6706 // 6.7.5.3p11.
6707 && (TryAnnotateTypeOrScopeToken() || !Tok.is(tok::annot_typename))
6708 // Identifier lists follow a really simple grammar: the identifiers can
6709 // be followed *only* by a ", identifier" or ")". However, K&R
6710 // identifier lists are really rare in the brave new modern world, and
6711 // it is very common for someone to typo a type in a non-K&R style
6712 // list. If we are presented with something like: "void foo(intptr x,
6713 // float y)", we don't want to start parsing the function declarator as
6714 // though it is a K&R style declarator just because intptr is an
6715 // invalid type.
6716 //
6717 // To handle this, we check to see if the token after the first
6718 // identifier is a "," or ")". Only then do we parse it as an
6719 // identifier list.
6720 && (!Tok.is(tok::eof) &&
6721 (NextToken().is(tok::comma) || NextToken().is(tok::r_paren)));
6722 }
6723
6724 /// ParseFunctionDeclaratorIdentifierList - While parsing a function declarator
6725 /// we found a K&R-style identifier list instead of a typed parameter list.
6726 ///
6727 /// After returning, ParamInfo will hold the parsed parameters.
6728 ///
6729 /// identifier-list: [C99 6.7.5]
6730 /// identifier
6731 /// identifier-list ',' identifier
6732 ///
ParseFunctionDeclaratorIdentifierList(Declarator & D,SmallVectorImpl<DeclaratorChunk::ParamInfo> & ParamInfo)6733 void Parser::ParseFunctionDeclaratorIdentifierList(
6734 Declarator &D,
6735 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo) {
6736 // If there was no identifier specified for the declarator, either we are in
6737 // an abstract-declarator, or we are in a parameter declarator which was found
6738 // to be abstract. In abstract-declarators, identifier lists are not valid:
6739 // diagnose this.
6740 if (!D.getIdentifier())
6741 Diag(Tok, diag::ext_ident_list_in_param);
6742
6743 // Maintain an efficient lookup of params we have seen so far.
6744 llvm::SmallSet<const IdentifierInfo*, 16> ParamsSoFar;
6745
6746 do {
6747 // If this isn't an identifier, report the error and skip until ')'.
6748 if (Tok.isNot(tok::identifier)) {
6749 Diag(Tok, diag::err_expected) << tok::identifier;
6750 SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch);
6751 // Forget we parsed anything.
6752 ParamInfo.clear();
6753 return;
6754 }
6755
6756 IdentifierInfo *ParmII = Tok.getIdentifierInfo();
6757
6758 // Reject 'typedef int y; int test(x, y)', but continue parsing.
6759 if (Actions.getTypeName(*ParmII, Tok.getLocation(), getCurScope()))
6760 Diag(Tok, diag::err_unexpected_typedef_ident) << ParmII;
6761
6762 // Verify that the argument identifier has not already been mentioned.
6763 if (!ParamsSoFar.insert(ParmII).second) {
6764 Diag(Tok, diag::err_param_redefinition) << ParmII;
6765 } else {
6766 // Remember this identifier in ParamInfo.
6767 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
6768 Tok.getLocation(),
6769 nullptr));
6770 }
6771
6772 // Eat the identifier.
6773 ConsumeToken();
6774 // The list continues if we see a comma.
6775 } while (TryConsumeToken(tok::comma));
6776 }
6777
6778 /// ParseParameterDeclarationClause - Parse a (possibly empty) parameter-list
6779 /// after the opening parenthesis. This function will not parse a K&R-style
6780 /// identifier list.
6781 ///
6782 /// DeclContext is the context of the declarator being parsed. If FirstArgAttrs
6783 /// is non-null, then the caller parsed those attributes immediately after the
6784 /// open paren - they should be considered to be part of the first parameter.
6785 ///
6786 /// After returning, ParamInfo will hold the parsed parameters. EllipsisLoc will
6787 /// be the location of the ellipsis, if any was parsed.
6788 ///
6789 /// parameter-type-list: [C99 6.7.5]
6790 /// parameter-list
6791 /// parameter-list ',' '...'
6792 /// [C++] parameter-list '...'
6793 ///
6794 /// parameter-list: [C99 6.7.5]
6795 /// parameter-declaration
6796 /// parameter-list ',' parameter-declaration
6797 ///
6798 /// parameter-declaration: [C99 6.7.5]
6799 /// declaration-specifiers declarator
6800 /// [C++] declaration-specifiers declarator '=' assignment-expression
6801 /// [C++11] initializer-clause
6802 /// [GNU] declaration-specifiers declarator attributes
6803 /// declaration-specifiers abstract-declarator[opt]
6804 /// [C++] declaration-specifiers abstract-declarator[opt]
6805 /// '=' assignment-expression
6806 /// [GNU] declaration-specifiers abstract-declarator[opt] attributes
6807 /// [C++11] attribute-specifier-seq parameter-declaration
6808 ///
ParseParameterDeclarationClause(DeclaratorContext DeclaratorCtx,ParsedAttributes & FirstArgAttrs,SmallVectorImpl<DeclaratorChunk::ParamInfo> & ParamInfo,SourceLocation & EllipsisLoc)6809 void Parser::ParseParameterDeclarationClause(
6810 DeclaratorContext DeclaratorCtx,
6811 ParsedAttributes &FirstArgAttrs,
6812 SmallVectorImpl<DeclaratorChunk::ParamInfo> &ParamInfo,
6813 SourceLocation &EllipsisLoc) {
6814
6815 // Avoid exceeding the maximum function scope depth.
6816 // See https://bugs.llvm.org/show_bug.cgi?id=19607
6817 // Note Sema::ActOnParamDeclarator calls ParmVarDecl::setScopeInfo with
6818 // getFunctionPrototypeDepth() - 1.
6819 if (getCurScope()->getFunctionPrototypeDepth() - 1 >
6820 ParmVarDecl::getMaxFunctionScopeDepth()) {
6821 Diag(Tok.getLocation(), diag::err_function_scope_depth_exceeded)
6822 << ParmVarDecl::getMaxFunctionScopeDepth();
6823 cutOffParsing();
6824 return;
6825 }
6826
6827 do {
6828 // FIXME: Issue a diagnostic if we parsed an attribute-specifier-seq
6829 // before deciding this was a parameter-declaration-clause.
6830 if (TryConsumeToken(tok::ellipsis, EllipsisLoc))
6831 break;
6832
6833 // Parse the declaration-specifiers.
6834 // Just use the ParsingDeclaration "scope" of the declarator.
6835 DeclSpec DS(AttrFactory);
6836
6837 // Parse any C++11 attributes.
6838 MaybeParseCXX11Attributes(DS.getAttributes());
6839
6840 // Skip any Microsoft attributes before a param.
6841 MaybeParseMicrosoftAttributes(DS.getAttributes());
6842
6843 SourceLocation DSStart = Tok.getLocation();
6844
6845 // If the caller parsed attributes for the first argument, add them now.
6846 // Take them so that we only apply the attributes to the first parameter.
6847 // FIXME: If we can leave the attributes in the token stream somehow, we can
6848 // get rid of a parameter (FirstArgAttrs) and this statement. It might be
6849 // too much hassle.
6850 DS.takeAttributesFrom(FirstArgAttrs);
6851
6852 ParseDeclarationSpecifiers(DS);
6853
6854
6855 // Parse the declarator. This is "PrototypeContext" or
6856 // "LambdaExprParameterContext", because we must accept either
6857 // 'declarator' or 'abstract-declarator' here.
6858 Declarator ParmDeclarator(
6859 DS, DeclaratorCtx == DeclaratorContext::RequiresExpr
6860 ? DeclaratorContext::RequiresExpr
6861 : DeclaratorCtx == DeclaratorContext::LambdaExpr
6862 ? DeclaratorContext::LambdaExprParameter
6863 : DeclaratorContext::Prototype);
6864 ParseDeclarator(ParmDeclarator);
6865
6866 // Parse GNU attributes, if present.
6867 MaybeParseGNUAttributes(ParmDeclarator);
6868
6869 if (Tok.is(tok::kw_requires)) {
6870 // User tried to define a requires clause in a parameter declaration,
6871 // which is surely not a function declaration.
6872 // void f(int (*g)(int, int) requires true);
6873 Diag(Tok,
6874 diag::err_requires_clause_on_declarator_not_declaring_a_function);
6875 ConsumeToken();
6876 Actions.CorrectDelayedTyposInExpr(
6877 ParseConstraintLogicalOrExpression(/*IsTrailingRequiresClause=*/true));
6878 }
6879
6880 // Remember this parsed parameter in ParamInfo.
6881 IdentifierInfo *ParmII = ParmDeclarator.getIdentifier();
6882
6883 // DefArgToks is used when the parsing of default arguments needs
6884 // to be delayed.
6885 std::unique_ptr<CachedTokens> DefArgToks;
6886
6887 // If no parameter was specified, verify that *something* was specified,
6888 // otherwise we have a missing type and identifier.
6889 if (DS.isEmpty() && ParmDeclarator.getIdentifier() == nullptr &&
6890 ParmDeclarator.getNumTypeObjects() == 0) {
6891 // Completely missing, emit error.
6892 Diag(DSStart, diag::err_missing_param);
6893 } else {
6894 // Otherwise, we have something. Add it and let semantic analysis try
6895 // to grok it and add the result to the ParamInfo we are building.
6896
6897 // Last chance to recover from a misplaced ellipsis in an attempted
6898 // parameter pack declaration.
6899 if (Tok.is(tok::ellipsis) &&
6900 (NextToken().isNot(tok::r_paren) ||
6901 (!ParmDeclarator.getEllipsisLoc().isValid() &&
6902 !Actions.isUnexpandedParameterPackPermitted())) &&
6903 Actions.containsUnexpandedParameterPacks(ParmDeclarator))
6904 DiagnoseMisplacedEllipsisInDeclarator(ConsumeToken(), ParmDeclarator);
6905
6906 // Now we are at the point where declarator parsing is finished.
6907 //
6908 // Try to catch keywords in place of the identifier in a declarator, and
6909 // in particular the common case where:
6910 // 1 identifier comes at the end of the declarator
6911 // 2 if the identifier is dropped, the declarator is valid but anonymous
6912 // (no identifier)
6913 // 3 declarator parsing succeeds, and then we have a trailing keyword,
6914 // which is never valid in a param list (e.g. missing a ',')
6915 // And we can't handle this in ParseDeclarator because in general keywords
6916 // may be allowed to follow the declarator. (And in some cases there'd be
6917 // better recovery like inserting punctuation). ParseDeclarator is just
6918 // treating this as an anonymous parameter, and fortunately at this point
6919 // we've already almost done that.
6920 //
6921 // We care about case 1) where the declarator type should be known, and
6922 // the identifier should be null.
6923 if (!ParmDeclarator.isInvalidType() && !ParmDeclarator.hasName()) {
6924 if (Tok.getIdentifierInfo() &&
6925 Tok.getIdentifierInfo()->isKeyword(getLangOpts())) {
6926 Diag(Tok, diag::err_keyword_as_parameter) << PP.getSpelling(Tok);
6927 // Consume the keyword.
6928 ConsumeToken();
6929 }
6930 }
6931 // Inform the actions module about the parameter declarator, so it gets
6932 // added to the current scope.
6933 Decl *Param = Actions.ActOnParamDeclarator(getCurScope(), ParmDeclarator);
6934 // Parse the default argument, if any. We parse the default
6935 // arguments in all dialects; the semantic analysis in
6936 // ActOnParamDefaultArgument will reject the default argument in
6937 // C.
6938 if (Tok.is(tok::equal)) {
6939 SourceLocation EqualLoc = Tok.getLocation();
6940
6941 // Parse the default argument
6942 if (DeclaratorCtx == DeclaratorContext::Member) {
6943 // If we're inside a class definition, cache the tokens
6944 // corresponding to the default argument. We'll actually parse
6945 // them when we see the end of the class definition.
6946 DefArgToks.reset(new CachedTokens);
6947
6948 SourceLocation ArgStartLoc = NextToken().getLocation();
6949 if (!ConsumeAndStoreInitializer(*DefArgToks, CIK_DefaultArgument)) {
6950 DefArgToks.reset();
6951 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc);
6952 } else {
6953 Actions.ActOnParamUnparsedDefaultArgument(Param, EqualLoc,
6954 ArgStartLoc);
6955 }
6956 } else {
6957 // Consume the '='.
6958 ConsumeToken();
6959
6960 // The argument isn't actually potentially evaluated unless it is
6961 // used.
6962 EnterExpressionEvaluationContext Eval(
6963 Actions,
6964 Sema::ExpressionEvaluationContext::PotentiallyEvaluatedIfUsed,
6965 Param);
6966
6967 ExprResult DefArgResult;
6968 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
6969 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
6970 DefArgResult = ParseBraceInitializer();
6971 } else
6972 DefArgResult = ParseAssignmentExpression();
6973 DefArgResult = Actions.CorrectDelayedTyposInExpr(DefArgResult);
6974 if (DefArgResult.isInvalid()) {
6975 Actions.ActOnParamDefaultArgumentError(Param, EqualLoc);
6976 SkipUntil(tok::comma, tok::r_paren, StopAtSemi | StopBeforeMatch);
6977 } else {
6978 // Inform the actions module about the default argument
6979 Actions.ActOnParamDefaultArgument(Param, EqualLoc,
6980 DefArgResult.get());
6981 }
6982 }
6983 }
6984
6985 ParamInfo.push_back(DeclaratorChunk::ParamInfo(ParmII,
6986 ParmDeclarator.getIdentifierLoc(),
6987 Param, std::move(DefArgToks)));
6988 }
6989
6990 if (TryConsumeToken(tok::ellipsis, EllipsisLoc)) {
6991 if (!getLangOpts().CPlusPlus) {
6992 // We have ellipsis without a preceding ',', which is ill-formed
6993 // in C. Complain and provide the fix.
6994 Diag(EllipsisLoc, diag::err_missing_comma_before_ellipsis)
6995 << FixItHint::CreateInsertion(EllipsisLoc, ", ");
6996 } else if (ParmDeclarator.getEllipsisLoc().isValid() ||
6997 Actions.containsUnexpandedParameterPacks(ParmDeclarator)) {
6998 // It looks like this was supposed to be a parameter pack. Warn and
6999 // point out where the ellipsis should have gone.
7000 SourceLocation ParmEllipsis = ParmDeclarator.getEllipsisLoc();
7001 Diag(EllipsisLoc, diag::warn_misplaced_ellipsis_vararg)
7002 << ParmEllipsis.isValid() << ParmEllipsis;
7003 if (ParmEllipsis.isValid()) {
7004 Diag(ParmEllipsis,
7005 diag::note_misplaced_ellipsis_vararg_existing_ellipsis);
7006 } else {
7007 Diag(ParmDeclarator.getIdentifierLoc(),
7008 diag::note_misplaced_ellipsis_vararg_add_ellipsis)
7009 << FixItHint::CreateInsertion(ParmDeclarator.getIdentifierLoc(),
7010 "...")
7011 << !ParmDeclarator.hasName();
7012 }
7013 Diag(EllipsisLoc, diag::note_misplaced_ellipsis_vararg_add_comma)
7014 << FixItHint::CreateInsertion(EllipsisLoc, ", ");
7015 }
7016
7017 // We can't have any more parameters after an ellipsis.
7018 break;
7019 }
7020
7021 // If the next token is a comma, consume it and keep reading arguments.
7022 } while (TryConsumeToken(tok::comma));
7023 }
7024
7025 /// [C90] direct-declarator '[' constant-expression[opt] ']'
7026 /// [C99] direct-declarator '[' type-qual-list[opt] assignment-expr[opt] ']'
7027 /// [C99] direct-declarator '[' 'static' type-qual-list[opt] assign-expr ']'
7028 /// [C99] direct-declarator '[' type-qual-list 'static' assignment-expr ']'
7029 /// [C99] direct-declarator '[' type-qual-list[opt] '*' ']'
7030 /// [C++11] direct-declarator '[' constant-expression[opt] ']'
7031 /// attribute-specifier-seq[opt]
ParseBracketDeclarator(Declarator & D)7032 void Parser::ParseBracketDeclarator(Declarator &D) {
7033 if (CheckProhibitedCXX11Attribute())
7034 return;
7035
7036 BalancedDelimiterTracker T(*this, tok::l_square);
7037 T.consumeOpen();
7038
7039 // C array syntax has many features, but by-far the most common is [] and [4].
7040 // This code does a fast path to handle some of the most obvious cases.
7041 if (Tok.getKind() == tok::r_square) {
7042 T.consumeClose();
7043 ParsedAttributes attrs(AttrFactory);
7044 MaybeParseCXX11Attributes(attrs);
7045
7046 // Remember that we parsed the empty array type.
7047 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, nullptr,
7048 T.getOpenLocation(),
7049 T.getCloseLocation()),
7050 std::move(attrs), T.getCloseLocation());
7051 return;
7052 } else if (Tok.getKind() == tok::numeric_constant &&
7053 GetLookAheadToken(1).is(tok::r_square)) {
7054 // [4] is very common. Parse the numeric constant expression.
7055 ExprResult ExprRes(Actions.ActOnNumericConstant(Tok, getCurScope()));
7056 ConsumeToken();
7057
7058 T.consumeClose();
7059 ParsedAttributes attrs(AttrFactory);
7060 MaybeParseCXX11Attributes(attrs);
7061
7062 // Remember that we parsed a array type, and remember its features.
7063 D.AddTypeInfo(DeclaratorChunk::getArray(0, false, false, ExprRes.get(),
7064 T.getOpenLocation(),
7065 T.getCloseLocation()),
7066 std::move(attrs), T.getCloseLocation());
7067 return;
7068 } else if (Tok.getKind() == tok::code_completion) {
7069 cutOffParsing();
7070 Actions.CodeCompleteBracketDeclarator(getCurScope());
7071 return;
7072 }
7073
7074 // If valid, this location is the position where we read the 'static' keyword.
7075 SourceLocation StaticLoc;
7076 TryConsumeToken(tok::kw_static, StaticLoc);
7077
7078 // If there is a type-qualifier-list, read it now.
7079 // Type qualifiers in an array subscript are a C99 feature.
7080 DeclSpec DS(AttrFactory);
7081 ParseTypeQualifierListOpt(DS, AR_CXX11AttributesParsed);
7082
7083 // If we haven't already read 'static', check to see if there is one after the
7084 // type-qualifier-list.
7085 if (!StaticLoc.isValid())
7086 TryConsumeToken(tok::kw_static, StaticLoc);
7087
7088 // Handle "direct-declarator [ type-qual-list[opt] * ]".
7089 bool isStar = false;
7090 ExprResult NumElements;
7091
7092 // Handle the case where we have '[*]' as the array size. However, a leading
7093 // star could be the start of an expression, for example 'X[*p + 4]'. Verify
7094 // the token after the star is a ']'. Since stars in arrays are
7095 // infrequent, use of lookahead is not costly here.
7096 if (Tok.is(tok::star) && GetLookAheadToken(1).is(tok::r_square)) {
7097 ConsumeToken(); // Eat the '*'.
7098
7099 if (StaticLoc.isValid()) {
7100 Diag(StaticLoc, diag::err_unspecified_vla_size_with_static);
7101 StaticLoc = SourceLocation(); // Drop the static.
7102 }
7103 isStar = true;
7104 } else if (Tok.isNot(tok::r_square)) {
7105 // Note, in C89, this production uses the constant-expr production instead
7106 // of assignment-expr. The only difference is that assignment-expr allows
7107 // things like '=' and '*='. Sema rejects these in C89 mode because they
7108 // are not i-c-e's, so we don't need to distinguish between the two here.
7109
7110 // Parse the constant-expression or assignment-expression now (depending
7111 // on dialect).
7112 if (getLangOpts().CPlusPlus) {
7113 NumElements = ParseConstantExpression();
7114 } else {
7115 EnterExpressionEvaluationContext Unevaluated(
7116 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
7117 NumElements =
7118 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
7119 }
7120 } else {
7121 if (StaticLoc.isValid()) {
7122 Diag(StaticLoc, diag::err_unspecified_size_with_static);
7123 StaticLoc = SourceLocation(); // Drop the static.
7124 }
7125 }
7126
7127 // If there was an error parsing the assignment-expression, recover.
7128 if (NumElements.isInvalid()) {
7129 D.setInvalidType(true);
7130 // If the expression was invalid, skip it.
7131 SkipUntil(tok::r_square, StopAtSemi);
7132 return;
7133 }
7134
7135 T.consumeClose();
7136
7137 MaybeParseCXX11Attributes(DS.getAttributes());
7138
7139 // Remember that we parsed a array type, and remember its features.
7140 D.AddTypeInfo(
7141 DeclaratorChunk::getArray(DS.getTypeQualifiers(), StaticLoc.isValid(),
7142 isStar, NumElements.get(), T.getOpenLocation(),
7143 T.getCloseLocation()),
7144 std::move(DS.getAttributes()), T.getCloseLocation());
7145 }
7146
7147 /// Diagnose brackets before an identifier.
ParseMisplacedBracketDeclarator(Declarator & D)7148 void Parser::ParseMisplacedBracketDeclarator(Declarator &D) {
7149 assert(Tok.is(tok::l_square) && "Missing opening bracket");
7150 assert(!D.mayOmitIdentifier() && "Declarator cannot omit identifier");
7151
7152 SourceLocation StartBracketLoc = Tok.getLocation();
7153 Declarator TempDeclarator(D.getDeclSpec(), D.getContext());
7154
7155 while (Tok.is(tok::l_square)) {
7156 ParseBracketDeclarator(TempDeclarator);
7157 }
7158
7159 // Stuff the location of the start of the brackets into the Declarator.
7160 // The diagnostics from ParseDirectDeclarator will make more sense if
7161 // they use this location instead.
7162 if (Tok.is(tok::semi))
7163 D.getName().EndLocation = StartBracketLoc;
7164
7165 SourceLocation SuggestParenLoc = Tok.getLocation();
7166
7167 // Now that the brackets are removed, try parsing the declarator again.
7168 ParseDeclaratorInternal(D, &Parser::ParseDirectDeclarator);
7169
7170 // Something went wrong parsing the brackets, in which case,
7171 // ParseBracketDeclarator has emitted an error, and we don't need to emit
7172 // one here.
7173 if (TempDeclarator.getNumTypeObjects() == 0)
7174 return;
7175
7176 // Determine if parens will need to be suggested in the diagnostic.
7177 bool NeedParens = false;
7178 if (D.getNumTypeObjects() != 0) {
7179 switch (D.getTypeObject(D.getNumTypeObjects() - 1).Kind) {
7180 case DeclaratorChunk::Pointer:
7181 case DeclaratorChunk::Reference:
7182 case DeclaratorChunk::BlockPointer:
7183 case DeclaratorChunk::MemberPointer:
7184 case DeclaratorChunk::Pipe:
7185 NeedParens = true;
7186 break;
7187 case DeclaratorChunk::Array:
7188 case DeclaratorChunk::Function:
7189 case DeclaratorChunk::Paren:
7190 break;
7191 }
7192 }
7193
7194 if (NeedParens) {
7195 // Create a DeclaratorChunk for the inserted parens.
7196 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getEndLoc());
7197 D.AddTypeInfo(DeclaratorChunk::getParen(SuggestParenLoc, EndLoc),
7198 SourceLocation());
7199 }
7200
7201 // Adding back the bracket info to the end of the Declarator.
7202 for (unsigned i = 0, e = TempDeclarator.getNumTypeObjects(); i < e; ++i) {
7203 const DeclaratorChunk &Chunk = TempDeclarator.getTypeObject(i);
7204 D.AddTypeInfo(Chunk, SourceLocation());
7205 }
7206
7207 // The missing identifier would have been diagnosed in ParseDirectDeclarator.
7208 // If parentheses are required, always suggest them.
7209 if (!D.getIdentifier() && !NeedParens)
7210 return;
7211
7212 SourceLocation EndBracketLoc = TempDeclarator.getEndLoc();
7213
7214 // Generate the move bracket error message.
7215 SourceRange BracketRange(StartBracketLoc, EndBracketLoc);
7216 SourceLocation EndLoc = PP.getLocForEndOfToken(D.getEndLoc());
7217
7218 if (NeedParens) {
7219 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id)
7220 << getLangOpts().CPlusPlus
7221 << FixItHint::CreateInsertion(SuggestParenLoc, "(")
7222 << FixItHint::CreateInsertion(EndLoc, ")")
7223 << FixItHint::CreateInsertionFromRange(
7224 EndLoc, CharSourceRange(BracketRange, true))
7225 << FixItHint::CreateRemoval(BracketRange);
7226 } else {
7227 Diag(EndLoc, diag::err_brackets_go_after_unqualified_id)
7228 << getLangOpts().CPlusPlus
7229 << FixItHint::CreateInsertionFromRange(
7230 EndLoc, CharSourceRange(BracketRange, true))
7231 << FixItHint::CreateRemoval(BracketRange);
7232 }
7233 }
7234
7235 /// [GNU] typeof-specifier:
7236 /// typeof ( expressions )
7237 /// typeof ( type-name )
7238 /// [GNU/C++] typeof unary-expression
7239 ///
ParseTypeofSpecifier(DeclSpec & DS)7240 void Parser::ParseTypeofSpecifier(DeclSpec &DS) {
7241 assert(Tok.is(tok::kw_typeof) && "Not a typeof specifier");
7242 Token OpTok = Tok;
7243 SourceLocation StartLoc = ConsumeToken();
7244
7245 const bool hasParens = Tok.is(tok::l_paren);
7246
7247 EnterExpressionEvaluationContext Unevaluated(
7248 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
7249 Sema::ReuseLambdaContextDecl);
7250
7251 bool isCastExpr;
7252 ParsedType CastTy;
7253 SourceRange CastRange;
7254 ExprResult Operand = Actions.CorrectDelayedTyposInExpr(
7255 ParseExprAfterUnaryExprOrTypeTrait(OpTok, isCastExpr, CastTy, CastRange));
7256 if (hasParens)
7257 DS.setTypeofParensRange(CastRange);
7258
7259 if (CastRange.getEnd().isInvalid())
7260 // FIXME: Not accurate, the range gets one token more than it should.
7261 DS.SetRangeEnd(Tok.getLocation());
7262 else
7263 DS.SetRangeEnd(CastRange.getEnd());
7264
7265 if (isCastExpr) {
7266 if (!CastTy) {
7267 DS.SetTypeSpecError();
7268 return;
7269 }
7270
7271 const char *PrevSpec = nullptr;
7272 unsigned DiagID;
7273 // Check for duplicate type specifiers (e.g. "int typeof(int)").
7274 if (DS.SetTypeSpecType(DeclSpec::TST_typeofType, StartLoc, PrevSpec,
7275 DiagID, CastTy,
7276 Actions.getASTContext().getPrintingPolicy()))
7277 Diag(StartLoc, DiagID) << PrevSpec;
7278 return;
7279 }
7280
7281 // If we get here, the operand to the typeof was an expression.
7282 if (Operand.isInvalid()) {
7283 DS.SetTypeSpecError();
7284 return;
7285 }
7286
7287 // We might need to transform the operand if it is potentially evaluated.
7288 Operand = Actions.HandleExprEvaluationContextForTypeof(Operand.get());
7289 if (Operand.isInvalid()) {
7290 DS.SetTypeSpecError();
7291 return;
7292 }
7293
7294 const char *PrevSpec = nullptr;
7295 unsigned DiagID;
7296 // Check for duplicate type specifiers (e.g. "int typeof(int)").
7297 if (DS.SetTypeSpecType(DeclSpec::TST_typeofExpr, StartLoc, PrevSpec,
7298 DiagID, Operand.get(),
7299 Actions.getASTContext().getPrintingPolicy()))
7300 Diag(StartLoc, DiagID) << PrevSpec;
7301 }
7302
7303 /// [C11] atomic-specifier:
7304 /// _Atomic ( type-name )
7305 ///
ParseAtomicSpecifier(DeclSpec & DS)7306 void Parser::ParseAtomicSpecifier(DeclSpec &DS) {
7307 assert(Tok.is(tok::kw__Atomic) && NextToken().is(tok::l_paren) &&
7308 "Not an atomic specifier");
7309
7310 SourceLocation StartLoc = ConsumeToken();
7311 BalancedDelimiterTracker T(*this, tok::l_paren);
7312 if (T.consumeOpen())
7313 return;
7314
7315 TypeResult Result = ParseTypeName();
7316 if (Result.isInvalid()) {
7317 SkipUntil(tok::r_paren, StopAtSemi);
7318 return;
7319 }
7320
7321 // Match the ')'
7322 T.consumeClose();
7323
7324 if (T.getCloseLocation().isInvalid())
7325 return;
7326
7327 DS.setTypeofParensRange(T.getRange());
7328 DS.SetRangeEnd(T.getCloseLocation());
7329
7330 const char *PrevSpec = nullptr;
7331 unsigned DiagID;
7332 if (DS.SetTypeSpecType(DeclSpec::TST_atomic, StartLoc, PrevSpec,
7333 DiagID, Result.get(),
7334 Actions.getASTContext().getPrintingPolicy()))
7335 Diag(StartLoc, DiagID) << PrevSpec;
7336 }
7337
7338 /// TryAltiVecVectorTokenOutOfLine - Out of line body that should only be called
7339 /// from TryAltiVecVectorToken.
TryAltiVecVectorTokenOutOfLine()7340 bool Parser::TryAltiVecVectorTokenOutOfLine() {
7341 Token Next = NextToken();
7342 switch (Next.getKind()) {
7343 default: return false;
7344 case tok::kw_short:
7345 case tok::kw_long:
7346 case tok::kw_signed:
7347 case tok::kw_unsigned:
7348 case tok::kw_void:
7349 case tok::kw_char:
7350 case tok::kw_int:
7351 case tok::kw_float:
7352 case tok::kw_double:
7353 case tok::kw_bool:
7354 case tok::kw__Bool:
7355 case tok::kw___bool:
7356 case tok::kw___pixel:
7357 Tok.setKind(tok::kw___vector);
7358 return true;
7359 case tok::identifier:
7360 if (Next.getIdentifierInfo() == Ident_pixel) {
7361 Tok.setKind(tok::kw___vector);
7362 return true;
7363 }
7364 if (Next.getIdentifierInfo() == Ident_bool ||
7365 Next.getIdentifierInfo() == Ident_Bool) {
7366 Tok.setKind(tok::kw___vector);
7367 return true;
7368 }
7369 return false;
7370 }
7371 }
7372
TryAltiVecTokenOutOfLine(DeclSpec & DS,SourceLocation Loc,const char * & PrevSpec,unsigned & DiagID,bool & isInvalid)7373 bool Parser::TryAltiVecTokenOutOfLine(DeclSpec &DS, SourceLocation Loc,
7374 const char *&PrevSpec, unsigned &DiagID,
7375 bool &isInvalid) {
7376 const PrintingPolicy &Policy = Actions.getASTContext().getPrintingPolicy();
7377 if (Tok.getIdentifierInfo() == Ident_vector) {
7378 Token Next = NextToken();
7379 switch (Next.getKind()) {
7380 case tok::kw_short:
7381 case tok::kw_long:
7382 case tok::kw_signed:
7383 case tok::kw_unsigned:
7384 case tok::kw_void:
7385 case tok::kw_char:
7386 case tok::kw_int:
7387 case tok::kw_float:
7388 case tok::kw_double:
7389 case tok::kw_bool:
7390 case tok::kw__Bool:
7391 case tok::kw___bool:
7392 case tok::kw___pixel:
7393 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy);
7394 return true;
7395 case tok::identifier:
7396 if (Next.getIdentifierInfo() == Ident_pixel) {
7397 isInvalid = DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID,Policy);
7398 return true;
7399 }
7400 if (Next.getIdentifierInfo() == Ident_bool ||
7401 Next.getIdentifierInfo() == Ident_Bool) {
7402 isInvalid =
7403 DS.SetTypeAltiVecVector(true, Loc, PrevSpec, DiagID, Policy);
7404 return true;
7405 }
7406 break;
7407 default:
7408 break;
7409 }
7410 } else if ((Tok.getIdentifierInfo() == Ident_pixel) &&
7411 DS.isTypeAltiVecVector()) {
7412 isInvalid = DS.SetTypeAltiVecPixel(true, Loc, PrevSpec, DiagID, Policy);
7413 return true;
7414 } else if ((Tok.getIdentifierInfo() == Ident_bool) &&
7415 DS.isTypeAltiVecVector()) {
7416 isInvalid = DS.SetTypeAltiVecBool(true, Loc, PrevSpec, DiagID, Policy);
7417 return true;
7418 }
7419 return false;
7420 }
7421