Bug Summary

File:tools/clang/lib/Parse/ParseExprCXX.cpp
Warning:line 1770, column 5
Called C++ object pointer is null

Annotated Source Code

1//===--- ParseExprCXX.cpp - C++ Expression Parsing ------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Expression parsing implementation for C++.
11//
12//===----------------------------------------------------------------------===//
13#include "clang/Parse/Parser.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/DeclTemplate.h"
16#include "clang/Basic/PrettyStackTrace.h"
17#include "clang/Lex/LiteralSupport.h"
18#include "clang/Parse/ParseDiagnostic.h"
19#include "clang/Parse/RAIIObjectsForParser.h"
20#include "clang/Sema/DeclSpec.h"
21#include "clang/Sema/ParsedTemplate.h"
22#include "clang/Sema/Scope.h"
23#include "llvm/Support/ErrorHandling.h"
24
25
26using namespace clang;
27
28static int SelectDigraphErrorMessage(tok::TokenKind Kind) {
29 switch (Kind) {
30 // template name
31 case tok::unknown: return 0;
32 // casts
33 case tok::kw_const_cast: return 1;
34 case tok::kw_dynamic_cast: return 2;
35 case tok::kw_reinterpret_cast: return 3;
36 case tok::kw_static_cast: return 4;
37 default:
38 llvm_unreachable("Unknown type for digraph error message.")::llvm::llvm_unreachable_internal("Unknown type for digraph error message."
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 38)
;
39 }
40}
41
42// Are the two tokens adjacent in the same source file?
43bool Parser::areTokensAdjacent(const Token &First, const Token &Second) {
44 SourceManager &SM = PP.getSourceManager();
45 SourceLocation FirstLoc = SM.getSpellingLoc(First.getLocation());
46 SourceLocation FirstEnd = FirstLoc.getLocWithOffset(First.getLength());
47 return FirstEnd == SM.getSpellingLoc(Second.getLocation());
48}
49
50// Suggest fixit for "<::" after a cast.
51static void FixDigraph(Parser &P, Preprocessor &PP, Token &DigraphToken,
52 Token &ColonToken, tok::TokenKind Kind, bool AtDigraph) {
53 // Pull '<:' and ':' off token stream.
54 if (!AtDigraph)
55 PP.Lex(DigraphToken);
56 PP.Lex(ColonToken);
57
58 SourceRange Range;
59 Range.setBegin(DigraphToken.getLocation());
60 Range.setEnd(ColonToken.getLocation());
61 P.Diag(DigraphToken.getLocation(), diag::err_missing_whitespace_digraph)
62 << SelectDigraphErrorMessage(Kind)
63 << FixItHint::CreateReplacement(Range, "< ::");
64
65 // Update token information to reflect their change in token type.
66 ColonToken.setKind(tok::coloncolon);
67 ColonToken.setLocation(ColonToken.getLocation().getLocWithOffset(-1));
68 ColonToken.setLength(2);
69 DigraphToken.setKind(tok::less);
70 DigraphToken.setLength(1);
71
72 // Push new tokens back to token stream.
73 PP.EnterToken(ColonToken);
74 if (!AtDigraph)
75 PP.EnterToken(DigraphToken);
76}
77
78// Check for '<::' which should be '< ::' instead of '[:' when following
79// a template name.
80void Parser::CheckForTemplateAndDigraph(Token &Next, ParsedType ObjectType,
81 bool EnteringContext,
82 IdentifierInfo &II, CXXScopeSpec &SS) {
83 if (!Next.is(tok::l_square) || Next.getLength() != 2)
84 return;
85
86 Token SecondToken = GetLookAheadToken(2);
87 if (!SecondToken.is(tok::colon) || !areTokensAdjacent(Next, SecondToken))
88 return;
89
90 TemplateTy Template;
91 UnqualifiedId TemplateName;
92 TemplateName.setIdentifier(&II, Tok.getLocation());
93 bool MemberOfUnknownSpecialization;
94 if (!Actions.isTemplateName(getCurScope(), SS, /*hasTemplateKeyword=*/false,
95 TemplateName, ObjectType, EnteringContext,
96 Template, MemberOfUnknownSpecialization))
97 return;
98
99 FixDigraph(*this, PP, Next, SecondToken, tok::unknown,
100 /*AtDigraph*/false);
101}
102
103/// \brief Parse global scope or nested-name-specifier if present.
104///
105/// Parses a C++ global scope specifier ('::') or nested-name-specifier (which
106/// may be preceded by '::'). Note that this routine will not parse ::new or
107/// ::delete; it will just leave them in the token stream.
108///
109/// '::'[opt] nested-name-specifier
110/// '::'
111///
112/// nested-name-specifier:
113/// type-name '::'
114/// namespace-name '::'
115/// nested-name-specifier identifier '::'
116/// nested-name-specifier 'template'[opt] simple-template-id '::'
117///
118///
119/// \param SS the scope specifier that will be set to the parsed
120/// nested-name-specifier (or empty)
121///
122/// \param ObjectType if this nested-name-specifier is being parsed following
123/// the "." or "->" of a member access expression, this parameter provides the
124/// type of the object whose members are being accessed.
125///
126/// \param EnteringContext whether we will be entering into the context of
127/// the nested-name-specifier after parsing it.
128///
129/// \param MayBePseudoDestructor When non-NULL, points to a flag that
130/// indicates whether this nested-name-specifier may be part of a
131/// pseudo-destructor name. In this case, the flag will be set false
132/// if we don't actually end up parsing a destructor name. Moreorover,
133/// if we do end up determining that we are parsing a destructor name,
134/// the last component of the nested-name-specifier is not parsed as
135/// part of the scope specifier.
136///
137/// \param IsTypename If \c true, this nested-name-specifier is known to be
138/// part of a type name. This is used to improve error recovery.
139///
140/// \param LastII When non-NULL, points to an IdentifierInfo* that will be
141/// filled in with the leading identifier in the last component of the
142/// nested-name-specifier, if any.
143///
144/// \param OnlyNamespace If true, only considers namespaces in lookup.
145///
146/// \returns true if there was an error parsing a scope specifier
147bool Parser::ParseOptionalCXXScopeSpecifier(CXXScopeSpec &SS,
148 ParsedType ObjectType,
149 bool EnteringContext,
150 bool *MayBePseudoDestructor,
151 bool IsTypename,
152 IdentifierInfo **LastII,
153 bool OnlyNamespace) {
154 assert(getLangOpts().CPlusPlus &&(static_cast <bool> (getLangOpts().CPlusPlus &&
"Call sites of this function should be guarded by checking for C++"
) ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Call sites of this function should be guarded by checking for C++\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 155, __extension__ __PRETTY_FUNCTION__))
155 "Call sites of this function should be guarded by checking for C++")(static_cast <bool> (getLangOpts().CPlusPlus &&
"Call sites of this function should be guarded by checking for C++"
) ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"Call sites of this function should be guarded by checking for C++\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 155, __extension__ __PRETTY_FUNCTION__))
;
156
157 if (Tok.is(tok::annot_cxxscope)) {
158 assert(!LastII && "want last identifier but have already annotated scope")(static_cast <bool> (!LastII && "want last identifier but have already annotated scope"
) ? void (0) : __assert_fail ("!LastII && \"want last identifier but have already annotated scope\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 158, __extension__ __PRETTY_FUNCTION__))
;
159 assert(!MayBePseudoDestructor && "unexpected annot_cxxscope")(static_cast <bool> (!MayBePseudoDestructor && "unexpected annot_cxxscope"
) ? void (0) : __assert_fail ("!MayBePseudoDestructor && \"unexpected annot_cxxscope\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 159, __extension__ __PRETTY_FUNCTION__))
;
160 Actions.RestoreNestedNameSpecifierAnnotation(Tok.getAnnotationValue(),
161 Tok.getAnnotationRange(),
162 SS);
163 ConsumeAnnotationToken();
164 return false;
165 }
166
167 if (Tok.is(tok::annot_template_id)) {
168 // If the current token is an annotated template id, it may already have
169 // a scope specifier. Restore it.
170 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
171 SS = TemplateId->SS;
172 }
173
174 // Has to happen before any "return false"s in this function.
175 bool CheckForDestructor = false;
176 if (MayBePseudoDestructor && *MayBePseudoDestructor) {
177 CheckForDestructor = true;
178 *MayBePseudoDestructor = false;
179 }
180
181 if (LastII)
182 *LastII = nullptr;
183
184 bool HasScopeSpecifier = false;
185
186 if (Tok.is(tok::coloncolon)) {
187 // ::new and ::delete aren't nested-name-specifiers.
188 tok::TokenKind NextKind = NextToken().getKind();
189 if (NextKind == tok::kw_new || NextKind == tok::kw_delete)
190 return false;
191
192 if (NextKind == tok::l_brace) {
193 // It is invalid to have :: {, consume the scope qualifier and pretend
194 // like we never saw it.
195 Diag(ConsumeToken(), diag::err_expected) << tok::identifier;
196 } else {
197 // '::' - Global scope qualifier.
198 if (Actions.ActOnCXXGlobalScopeSpecifier(ConsumeToken(), SS))
199 return true;
200
201 HasScopeSpecifier = true;
202 }
203 }
204
205 if (Tok.is(tok::kw___super)) {
206 SourceLocation SuperLoc = ConsumeToken();
207 if (!Tok.is(tok::coloncolon)) {
208 Diag(Tok.getLocation(), diag::err_expected_coloncolon_after_super);
209 return true;
210 }
211
212 return Actions.ActOnSuperScopeSpecifier(SuperLoc, ConsumeToken(), SS);
213 }
214
215 if (!HasScopeSpecifier &&
216 Tok.isOneOf(tok::kw_decltype, tok::annot_decltype)) {
217 DeclSpec DS(AttrFactory);
218 SourceLocation DeclLoc = Tok.getLocation();
219 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
220
221 SourceLocation CCLoc;
222 // Work around a standard defect: 'decltype(auto)::' is not a
223 // nested-name-specifier.
224 if (DS.getTypeSpecType() == DeclSpec::TST_decltype_auto ||
225 !TryConsumeToken(tok::coloncolon, CCLoc)) {
226 AnnotateExistingDecltypeSpecifier(DS, DeclLoc, EndLoc);
227 return false;
228 }
229
230 if (Actions.ActOnCXXNestedNameSpecifierDecltype(SS, DS, CCLoc))
231 SS.SetInvalid(SourceRange(DeclLoc, CCLoc));
232
233 HasScopeSpecifier = true;
234 }
235
236 while (true) {
237 if (HasScopeSpecifier) {
238 // C++ [basic.lookup.classref]p5:
239 // If the qualified-id has the form
240 //
241 // ::class-name-or-namespace-name::...
242 //
243 // the class-name-or-namespace-name is looked up in global scope as a
244 // class-name or namespace-name.
245 //
246 // To implement this, we clear out the object type as soon as we've
247 // seen a leading '::' or part of a nested-name-specifier.
248 ObjectType = nullptr;
249
250 if (Tok.is(tok::code_completion)) {
251 // Code completion for a nested-name-specifier, where the code
252 // completion token follows the '::'.
253 Actions.CodeCompleteQualifiedId(getCurScope(), SS, EnteringContext);
254 // Include code completion token into the range of the scope otherwise
255 // when we try to annotate the scope tokens the dangling code completion
256 // token will cause assertion in
257 // Preprocessor::AnnotatePreviousCachedTokens.
258 SS.setEndLoc(Tok.getLocation());
259 cutOffParsing();
260 return true;
261 }
262 }
263
264 // nested-name-specifier:
265 // nested-name-specifier 'template'[opt] simple-template-id '::'
266
267 // Parse the optional 'template' keyword, then make sure we have
268 // 'identifier <' after it.
269 if (Tok.is(tok::kw_template)) {
270 // If we don't have a scope specifier or an object type, this isn't a
271 // nested-name-specifier, since they aren't allowed to start with
272 // 'template'.
273 if (!HasScopeSpecifier && !ObjectType)
274 break;
275
276 TentativeParsingAction TPA(*this);
277 SourceLocation TemplateKWLoc = ConsumeToken();
278
279 UnqualifiedId TemplateName;
280 if (Tok.is(tok::identifier)) {
281 // Consume the identifier.
282 TemplateName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
283 ConsumeToken();
284 } else if (Tok.is(tok::kw_operator)) {
285 // We don't need to actually parse the unqualified-id in this case,
286 // because a simple-template-id cannot start with 'operator', but
287 // go ahead and parse it anyway for consistency with the case where
288 // we already annotated the template-id.
289 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType,
290 TemplateName)) {
291 TPA.Commit();
292 break;
293 }
294
295 if (TemplateName.getKind() != UnqualifiedId::IK_OperatorFunctionId &&
296 TemplateName.getKind() != UnqualifiedId::IK_LiteralOperatorId) {
297 Diag(TemplateName.getSourceRange().getBegin(),
298 diag::err_id_after_template_in_nested_name_spec)
299 << TemplateName.getSourceRange();
300 TPA.Commit();
301 break;
302 }
303 } else {
304 TPA.Revert();
305 break;
306 }
307
308 // If the next token is not '<', we have a qualified-id that refers
309 // to a template name, such as T::template apply, but is not a
310 // template-id.
311 if (Tok.isNot(tok::less)) {
312 TPA.Revert();
313 break;
314 }
315
316 // Commit to parsing the template-id.
317 TPA.Commit();
318 TemplateTy Template;
319 if (TemplateNameKind TNK = Actions.ActOnDependentTemplateName(
320 getCurScope(), SS, TemplateKWLoc, TemplateName, ObjectType,
321 EnteringContext, Template, /*AllowInjectedClassName*/ true)) {
322 if (AnnotateTemplateIdToken(Template, TNK, SS, TemplateKWLoc,
323 TemplateName, false))
324 return true;
325 } else
326 return true;
327
328 continue;
329 }
330
331 if (Tok.is(tok::annot_template_id) && NextToken().is(tok::coloncolon)) {
332 // We have
333 //
334 // template-id '::'
335 //
336 // So we need to check whether the template-id is a simple-template-id of
337 // the right kind (it should name a type or be dependent), and then
338 // convert it into a type within the nested-name-specifier.
339 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
340 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde)) {
341 *MayBePseudoDestructor = true;
342 return false;
343 }
344
345 if (LastII)
346 *LastII = TemplateId->Name;
347
348 // Consume the template-id token.
349 ConsumeAnnotationToken();
350
351 assert(Tok.is(tok::coloncolon) && "NextToken() not working properly!")(static_cast <bool> (Tok.is(tok::coloncolon) &&
"NextToken() not working properly!") ? void (0) : __assert_fail
("Tok.is(tok::coloncolon) && \"NextToken() not working properly!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 351, __extension__ __PRETTY_FUNCTION__))
;
352 SourceLocation CCLoc = ConsumeToken();
353
354 HasScopeSpecifier = true;
355
356 ASTTemplateArgsPtr TemplateArgsPtr(TemplateId->getTemplateArgs(),
357 TemplateId->NumArgs);
358
359 if (Actions.ActOnCXXNestedNameSpecifier(getCurScope(),
360 SS,
361 TemplateId->TemplateKWLoc,
362 TemplateId->Template,
363 TemplateId->TemplateNameLoc,
364 TemplateId->LAngleLoc,
365 TemplateArgsPtr,
366 TemplateId->RAngleLoc,
367 CCLoc,
368 EnteringContext)) {
369 SourceLocation StartLoc
370 = SS.getBeginLoc().isValid()? SS.getBeginLoc()
371 : TemplateId->TemplateNameLoc;
372 SS.SetInvalid(SourceRange(StartLoc, CCLoc));
373 }
374
375 continue;
376 }
377
378 // The rest of the nested-name-specifier possibilities start with
379 // tok::identifier.
380 if (Tok.isNot(tok::identifier))
381 break;
382
383 IdentifierInfo &II = *Tok.getIdentifierInfo();
384
385 // nested-name-specifier:
386 // type-name '::'
387 // namespace-name '::'
388 // nested-name-specifier identifier '::'
389 Token Next = NextToken();
390 Sema::NestedNameSpecInfo IdInfo(&II, Tok.getLocation(), Next.getLocation(),
391 ObjectType);
392
393 // If we get foo:bar, this is almost certainly a typo for foo::bar. Recover
394 // and emit a fixit hint for it.
395 if (Next.is(tok::colon) && !ColonIsSacred) {
396 if (Actions.IsInvalidUnlessNestedName(getCurScope(), SS, IdInfo,
397 EnteringContext) &&
398 // If the token after the colon isn't an identifier, it's still an
399 // error, but they probably meant something else strange so don't
400 // recover like this.
401 PP.LookAhead(1).is(tok::identifier)) {
402 Diag(Next, diag::err_unexpected_colon_in_nested_name_spec)
403 << FixItHint::CreateReplacement(Next.getLocation(), "::");
404 // Recover as if the user wrote '::'.
405 Next.setKind(tok::coloncolon);
406 }
407 }
408
409 if (Next.is(tok::coloncolon) && GetLookAheadToken(2).is(tok::l_brace)) {
410 // It is invalid to have :: {, consume the scope qualifier and pretend
411 // like we never saw it.
412 Token Identifier = Tok; // Stash away the identifier.
413 ConsumeToken(); // Eat the identifier, current token is now '::'.
414 Diag(PP.getLocForEndOfToken(ConsumeToken()), diag::err_expected)
415 << tok::identifier;
416 UnconsumeToken(Identifier); // Stick the identifier back.
417 Next = NextToken(); // Point Next at the '{' token.
418 }
419
420 if (Next.is(tok::coloncolon)) {
421 if (CheckForDestructor && GetLookAheadToken(2).is(tok::tilde) &&
422 !Actions.isNonTypeNestedNameSpecifier(getCurScope(), SS, IdInfo)) {
423 *MayBePseudoDestructor = true;
424 return false;
425 }
426
427 if (ColonIsSacred) {
428 const Token &Next2 = GetLookAheadToken(2);
429 if (Next2.is(tok::kw_private) || Next2.is(tok::kw_protected) ||
430 Next2.is(tok::kw_public) || Next2.is(tok::kw_virtual)) {
431 Diag(Next2, diag::err_unexpected_token_in_nested_name_spec)
432 << Next2.getName()
433 << FixItHint::CreateReplacement(Next.getLocation(), ":");
434 Token ColonColon;
435 PP.Lex(ColonColon);
436 ColonColon.setKind(tok::colon);
437 PP.EnterToken(ColonColon);
438 break;
439 }
440 }
441
442 if (LastII)
443 *LastII = &II;
444
445 // We have an identifier followed by a '::'. Lookup this name
446 // as the name in a nested-name-specifier.
447 Token Identifier = Tok;
448 SourceLocation IdLoc = ConsumeToken();
449 assert(Tok.isOneOf(tok::coloncolon, tok::colon) &&(static_cast <bool> (Tok.isOneOf(tok::coloncolon, tok::
colon) && "NextToken() not working properly!") ? void
(0) : __assert_fail ("Tok.isOneOf(tok::coloncolon, tok::colon) && \"NextToken() not working properly!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 450, __extension__ __PRETTY_FUNCTION__))
450 "NextToken() not working properly!")(static_cast <bool> (Tok.isOneOf(tok::coloncolon, tok::
colon) && "NextToken() not working properly!") ? void
(0) : __assert_fail ("Tok.isOneOf(tok::coloncolon, tok::colon) && \"NextToken() not working properly!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 450, __extension__ __PRETTY_FUNCTION__))
;
451 Token ColonColon = Tok;
452 SourceLocation CCLoc = ConsumeToken();
453
454 bool IsCorrectedToColon = false;
455 bool *CorrectionFlagPtr = ColonIsSacred ? &IsCorrectedToColon : nullptr;
456 if (Actions.ActOnCXXNestedNameSpecifier(
457 getCurScope(), IdInfo, EnteringContext, SS, false,
458 CorrectionFlagPtr, OnlyNamespace)) {
459 // Identifier is not recognized as a nested name, but we can have
460 // mistyped '::' instead of ':'.
461 if (CorrectionFlagPtr && IsCorrectedToColon) {
462 ColonColon.setKind(tok::colon);
463 PP.EnterToken(Tok);
464 PP.EnterToken(ColonColon);
465 Tok = Identifier;
466 break;
467 }
468 SS.SetInvalid(SourceRange(IdLoc, CCLoc));
469 }
470 HasScopeSpecifier = true;
471 continue;
472 }
473
474 CheckForTemplateAndDigraph(Next, ObjectType, EnteringContext, II, SS);
475
476 // nested-name-specifier:
477 // type-name '<'
478 if (Next.is(tok::less)) {
479 TemplateTy Template;
480 UnqualifiedId TemplateName;
481 TemplateName.setIdentifier(&II, Tok.getLocation());
482 bool MemberOfUnknownSpecialization;
483 if (TemplateNameKind TNK = Actions.isTemplateName(getCurScope(), SS,
484 /*hasTemplateKeyword=*/false,
485 TemplateName,
486 ObjectType,
487 EnteringContext,
488 Template,
489 MemberOfUnknownSpecialization)) {
490 // We have found a template name, so annotate this token
491 // with a template-id annotation. We do not permit the
492 // template-id to be translated into a type annotation,
493 // because some clients (e.g., the parsing of class template
494 // specializations) still want to see the original template-id
495 // token.
496 ConsumeToken();
497 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
498 TemplateName, false))
499 return true;
500 continue;
501 }
502
503 if (MemberOfUnknownSpecialization && (ObjectType || SS.isSet()) &&
504 (IsTypename || IsTemplateArgumentList(1))) {
505 // We have something like t::getAs<T>, where getAs is a
506 // member of an unknown specialization. However, this will only
507 // parse correctly as a template, so suggest the keyword 'template'
508 // before 'getAs' and treat this as a dependent template name.
509 unsigned DiagID = diag::err_missing_dependent_template_keyword;
510 if (getLangOpts().MicrosoftExt)
511 DiagID = diag::warn_missing_dependent_template_keyword;
512
513 Diag(Tok.getLocation(), DiagID)
514 << II.getName()
515 << FixItHint::CreateInsertion(Tok.getLocation(), "template ");
516
517 if (TemplateNameKind TNK = Actions.ActOnDependentTemplateName(
518 getCurScope(), SS, SourceLocation(), TemplateName, ObjectType,
519 EnteringContext, Template, /*AllowInjectedClassName*/ true)) {
520 // Consume the identifier.
521 ConsumeToken();
522 if (AnnotateTemplateIdToken(Template, TNK, SS, SourceLocation(),
523 TemplateName, false))
524 return true;
525 }
526 else
527 return true;
528
529 continue;
530 }
531 }
532
533 // We don't have any tokens that form the beginning of a
534 // nested-name-specifier, so we're done.
535 break;
536 }
537
538 // Even if we didn't see any pieces of a nested-name-specifier, we
539 // still check whether there is a tilde in this position, which
540 // indicates a potential pseudo-destructor.
541 if (CheckForDestructor && Tok.is(tok::tilde))
542 *MayBePseudoDestructor = true;
543
544 return false;
545}
546
547ExprResult Parser::tryParseCXXIdExpression(CXXScopeSpec &SS, bool isAddressOfOperand,
548 Token &Replacement) {
549 SourceLocation TemplateKWLoc;
550 UnqualifiedId Name;
551 if (ParseUnqualifiedId(SS,
552 /*EnteringContext=*/false,
553 /*AllowDestructorName=*/false,
554 /*AllowConstructorName=*/false,
555 /*AllowDeductionGuide=*/false,
556 /*ObjectType=*/nullptr, TemplateKWLoc, Name))
557 return ExprError();
558
559 // This is only the direct operand of an & operator if it is not
560 // followed by a postfix-expression suffix.
561 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
562 isAddressOfOperand = false;
563
564 return Actions.ActOnIdExpression(getCurScope(), SS, TemplateKWLoc, Name,
565 Tok.is(tok::l_paren), isAddressOfOperand,
566 nullptr, /*IsInlineAsmIdentifier=*/false,
567 &Replacement);
568}
569
570/// ParseCXXIdExpression - Handle id-expression.
571///
572/// id-expression:
573/// unqualified-id
574/// qualified-id
575///
576/// qualified-id:
577/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
578/// '::' identifier
579/// '::' operator-function-id
580/// '::' template-id
581///
582/// NOTE: The standard specifies that, for qualified-id, the parser does not
583/// expect:
584///
585/// '::' conversion-function-id
586/// '::' '~' class-name
587///
588/// This may cause a slight inconsistency on diagnostics:
589///
590/// class C {};
591/// namespace A {}
592/// void f() {
593/// :: A :: ~ C(); // Some Sema error about using destructor with a
594/// // namespace.
595/// :: ~ C(); // Some Parser error like 'unexpected ~'.
596/// }
597///
598/// We simplify the parser a bit and make it work like:
599///
600/// qualified-id:
601/// '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
602/// '::' unqualified-id
603///
604/// That way Sema can handle and report similar errors for namespaces and the
605/// global scope.
606///
607/// The isAddressOfOperand parameter indicates that this id-expression is a
608/// direct operand of the address-of operator. This is, besides member contexts,
609/// the only place where a qualified-id naming a non-static class member may
610/// appear.
611///
612ExprResult Parser::ParseCXXIdExpression(bool isAddressOfOperand) {
613 // qualified-id:
614 // '::'[opt] nested-name-specifier 'template'[opt] unqualified-id
615 // '::' unqualified-id
616 //
617 CXXScopeSpec SS;
618 ParseOptionalCXXScopeSpecifier(SS, nullptr, /*EnteringContext=*/false);
619
620 Token Replacement;
621 ExprResult Result =
622 tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
623 if (Result.isUnset()) {
624 // If the ExprResult is valid but null, then typo correction suggested a
625 // keyword replacement that needs to be reparsed.
626 UnconsumeToken(Replacement);
627 Result = tryParseCXXIdExpression(SS, isAddressOfOperand, Replacement);
628 }
629 assert(!Result.isUnset() && "Typo correction suggested a keyword replacement "(static_cast <bool> (!Result.isUnset() && "Typo correction suggested a keyword replacement "
"for a previous keyword suggestion") ? void (0) : __assert_fail
("!Result.isUnset() && \"Typo correction suggested a keyword replacement \" \"for a previous keyword suggestion\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 630, __extension__ __PRETTY_FUNCTION__))
630 "for a previous keyword suggestion")(static_cast <bool> (!Result.isUnset() && "Typo correction suggested a keyword replacement "
"for a previous keyword suggestion") ? void (0) : __assert_fail
("!Result.isUnset() && \"Typo correction suggested a keyword replacement \" \"for a previous keyword suggestion\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 630, __extension__ __PRETTY_FUNCTION__))
;
631 return Result;
632}
633
634/// ParseLambdaExpression - Parse a C++11 lambda expression.
635///
636/// lambda-expression:
637/// lambda-introducer lambda-declarator[opt] compound-statement
638///
639/// lambda-introducer:
640/// '[' lambda-capture[opt] ']'
641///
642/// lambda-capture:
643/// capture-default
644/// capture-list
645/// capture-default ',' capture-list
646///
647/// capture-default:
648/// '&'
649/// '='
650///
651/// capture-list:
652/// capture
653/// capture-list ',' capture
654///
655/// capture:
656/// simple-capture
657/// init-capture [C++1y]
658///
659/// simple-capture:
660/// identifier
661/// '&' identifier
662/// 'this'
663///
664/// init-capture: [C++1y]
665/// identifier initializer
666/// '&' identifier initializer
667///
668/// lambda-declarator:
669/// '(' parameter-declaration-clause ')' attribute-specifier[opt]
670/// 'mutable'[opt] exception-specification[opt]
671/// trailing-return-type[opt]
672///
673ExprResult Parser::ParseLambdaExpression() {
674 // Parse lambda-introducer.
675 LambdaIntroducer Intro;
676 Optional<unsigned> DiagID = ParseLambdaIntroducer(Intro);
677 if (DiagID) {
678 Diag(Tok, DiagID.getValue());
679 SkipUntil(tok::r_square, StopAtSemi);
680 SkipUntil(tok::l_brace, StopAtSemi);
681 SkipUntil(tok::r_brace, StopAtSemi);
682 return ExprError();
683 }
684
685 return ParseLambdaExpressionAfterIntroducer(Intro);
686}
687
688/// TryParseLambdaExpression - Use lookahead and potentially tentative
689/// parsing to determine if we are looking at a C++0x lambda expression, and parse
690/// it if we are.
691///
692/// If we are not looking at a lambda expression, returns ExprError().
693ExprResult Parser::TryParseLambdaExpression() {
694 assert(getLangOpts().CPlusPlus11(static_cast <bool> (getLangOpts().CPlusPlus11 &&
Tok.is(tok::l_square) && "Not at the start of a possible lambda expression."
) ? void (0) : __assert_fail ("getLangOpts().CPlusPlus11 && Tok.is(tok::l_square) && \"Not at the start of a possible lambda expression.\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 696, __extension__ __PRETTY_FUNCTION__))
695 && Tok.is(tok::l_square)(static_cast <bool> (getLangOpts().CPlusPlus11 &&
Tok.is(tok::l_square) && "Not at the start of a possible lambda expression."
) ? void (0) : __assert_fail ("getLangOpts().CPlusPlus11 && Tok.is(tok::l_square) && \"Not at the start of a possible lambda expression.\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 696, __extension__ __PRETTY_FUNCTION__))
696 && "Not at the start of a possible lambda expression.")(static_cast <bool> (getLangOpts().CPlusPlus11 &&
Tok.is(tok::l_square) && "Not at the start of a possible lambda expression."
) ? void (0) : __assert_fail ("getLangOpts().CPlusPlus11 && Tok.is(tok::l_square) && \"Not at the start of a possible lambda expression.\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 696, __extension__ __PRETTY_FUNCTION__))
;
697
698 const Token Next = NextToken();
699 if (Next.is(tok::eof)) // Nothing else to lookup here...
700 return ExprEmpty();
701
702 const Token After = GetLookAheadToken(2);
703 // If lookahead indicates this is a lambda...
704 if (Next.is(tok::r_square) || // []
705 Next.is(tok::equal) || // [=
706 (Next.is(tok::amp) && // [&] or [&,
707 (After.is(tok::r_square) ||
708 After.is(tok::comma))) ||
709 (Next.is(tok::identifier) && // [identifier]
710 After.is(tok::r_square))) {
711 return ParseLambdaExpression();
712 }
713
714 // If lookahead indicates an ObjC message send...
715 // [identifier identifier
716 if (Next.is(tok::identifier) && After.is(tok::identifier)) {
717 return ExprEmpty();
718 }
719
720 // Here, we're stuck: lambda introducers and Objective-C message sends are
721 // unambiguous, but it requires arbitrary lookhead. [a,b,c,d,e,f,g] is a
722 // lambda, and [a,b,c,d,e,f,g h] is a Objective-C message send. Instead of
723 // writing two routines to parse a lambda introducer, just try to parse
724 // a lambda introducer first, and fall back if that fails.
725 // (TryParseLambdaIntroducer never produces any diagnostic output.)
726 LambdaIntroducer Intro;
727 if (TryParseLambdaIntroducer(Intro))
728 return ExprEmpty();
729
730 return ParseLambdaExpressionAfterIntroducer(Intro);
731}
732
733/// \brief Parse a lambda introducer.
734/// \param Intro A LambdaIntroducer filled in with information about the
735/// contents of the lambda-introducer.
736/// \param SkippedInits If non-null, we are disambiguating between an Obj-C
737/// message send and a lambda expression. In this mode, we will
738/// sometimes skip the initializers for init-captures and not fully
739/// populate \p Intro. This flag will be set to \c true if we do so.
740/// \return A DiagnosticID if it hit something unexpected. The location for
741/// the diagnostic is that of the current token.
742Optional<unsigned> Parser::ParseLambdaIntroducer(LambdaIntroducer &Intro,
743 bool *SkippedInits) {
744 typedef Optional<unsigned> DiagResult;
745
746 assert(Tok.is(tok::l_square) && "Lambda expressions begin with '['.")(static_cast <bool> (Tok.is(tok::l_square) && "Lambda expressions begin with '['."
) ? void (0) : __assert_fail ("Tok.is(tok::l_square) && \"Lambda expressions begin with '['.\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 746, __extension__ __PRETTY_FUNCTION__))
;
747 BalancedDelimiterTracker T(*this, tok::l_square);
748 T.consumeOpen();
749
750 Intro.Range.setBegin(T.getOpenLocation());
751
752 bool first = true;
753
754 // Parse capture-default.
755 if (Tok.is(tok::amp) &&
756 (NextToken().is(tok::comma) || NextToken().is(tok::r_square))) {
757 Intro.Default = LCD_ByRef;
758 Intro.DefaultLoc = ConsumeToken();
759 first = false;
760 } else if (Tok.is(tok::equal)) {
761 Intro.Default = LCD_ByCopy;
762 Intro.DefaultLoc = ConsumeToken();
763 first = false;
764 }
765
766 while (Tok.isNot(tok::r_square)) {
767 if (!first) {
768 if (Tok.isNot(tok::comma)) {
769 // Provide a completion for a lambda introducer here. Except
770 // in Objective-C, where this is Almost Surely meant to be a message
771 // send. In that case, fail here and let the ObjC message
772 // expression parser perform the completion.
773 if (Tok.is(tok::code_completion) &&
774 !(getLangOpts().ObjC1 && Intro.Default == LCD_None &&
775 !Intro.Captures.empty())) {
776 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
777 /*AfterAmpersand=*/false);
778 cutOffParsing();
779 break;
780 }
781
782 return DiagResult(diag::err_expected_comma_or_rsquare);
783 }
784 ConsumeToken();
785 }
786
787 if (Tok.is(tok::code_completion)) {
788 // If we're in Objective-C++ and we have a bare '[', then this is more
789 // likely to be a message receiver.
790 if (getLangOpts().ObjC1 && first)
791 Actions.CodeCompleteObjCMessageReceiver(getCurScope());
792 else
793 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
794 /*AfterAmpersand=*/false);
795 cutOffParsing();
796 break;
797 }
798
799 first = false;
800
801 // Parse capture.
802 LambdaCaptureKind Kind = LCK_ByCopy;
803 LambdaCaptureInitKind InitKind = LambdaCaptureInitKind::NoInit;
804 SourceLocation Loc;
805 IdentifierInfo *Id = nullptr;
806 SourceLocation EllipsisLoc;
807 ExprResult Init;
808
809 if (Tok.is(tok::star)) {
810 Loc = ConsumeToken();
811 if (Tok.is(tok::kw_this)) {
812 ConsumeToken();
813 Kind = LCK_StarThis;
814 } else {
815 return DiagResult(diag::err_expected_star_this_capture);
816 }
817 } else if (Tok.is(tok::kw_this)) {
818 Kind = LCK_This;
819 Loc = ConsumeToken();
820 } else {
821 if (Tok.is(tok::amp)) {
822 Kind = LCK_ByRef;
823 ConsumeToken();
824
825 if (Tok.is(tok::code_completion)) {
826 Actions.CodeCompleteLambdaIntroducer(getCurScope(), Intro,
827 /*AfterAmpersand=*/true);
828 cutOffParsing();
829 break;
830 }
831 }
832
833 if (Tok.is(tok::identifier)) {
834 Id = Tok.getIdentifierInfo();
835 Loc = ConsumeToken();
836 } else if (Tok.is(tok::kw_this)) {
837 // FIXME: If we want to suggest a fixit here, will need to return more
838 // than just DiagnosticID. Perhaps full DiagnosticBuilder that can be
839 // Clear()ed to prevent emission in case of tentative parsing?
840 return DiagResult(diag::err_this_captured_by_reference);
841 } else {
842 return DiagResult(diag::err_expected_capture);
843 }
844
845 if (Tok.is(tok::l_paren)) {
846 BalancedDelimiterTracker Parens(*this, tok::l_paren);
847 Parens.consumeOpen();
848
849 InitKind = LambdaCaptureInitKind::DirectInit;
850
851 ExprVector Exprs;
852 CommaLocsTy Commas;
853 if (SkippedInits) {
854 Parens.skipToEnd();
855 *SkippedInits = true;
856 } else if (ParseExpressionList(Exprs, Commas)) {
857 Parens.skipToEnd();
858 Init = ExprError();
859 } else {
860 Parens.consumeClose();
861 Init = Actions.ActOnParenListExpr(Parens.getOpenLocation(),
862 Parens.getCloseLocation(),
863 Exprs);
864 }
865 } else if (Tok.isOneOf(tok::l_brace, tok::equal)) {
866 // Each lambda init-capture forms its own full expression, which clears
867 // Actions.MaybeODRUseExprs. So create an expression evaluation context
868 // to save the necessary state, and restore it later.
869 EnterExpressionEvaluationContext EC(
870 Actions, Sema::ExpressionEvaluationContext::PotentiallyEvaluated);
871
872 if (TryConsumeToken(tok::equal))
873 InitKind = LambdaCaptureInitKind::CopyInit;
874 else
875 InitKind = LambdaCaptureInitKind::ListInit;
876
877 if (!SkippedInits) {
878 Init = ParseInitializer();
879 } else if (Tok.is(tok::l_brace)) {
880 BalancedDelimiterTracker Braces(*this, tok::l_brace);
881 Braces.consumeOpen();
882 Braces.skipToEnd();
883 *SkippedInits = true;
884 } else {
885 // We're disambiguating this:
886 //
887 // [..., x = expr
888 //
889 // We need to find the end of the following expression in order to
890 // determine whether this is an Obj-C message send's receiver, a
891 // C99 designator, or a lambda init-capture.
892 //
893 // Parse the expression to find where it ends, and annotate it back
894 // onto the tokens. We would have parsed this expression the same way
895 // in either case: both the RHS of an init-capture and the RHS of an
896 // assignment expression are parsed as an initializer-clause, and in
897 // neither case can anything be added to the scope between the '[' and
898 // here.
899 //
900 // FIXME: This is horrible. Adding a mechanism to skip an expression
901 // would be much cleaner.
902 // FIXME: If there is a ',' before the next ']' or ':', we can skip to
903 // that instead. (And if we see a ':' with no matching '?', we can
904 // classify this as an Obj-C message send.)
905 SourceLocation StartLoc = Tok.getLocation();
906 InMessageExpressionRAIIObject MaybeInMessageExpression(*this, true);
907 Init = ParseInitializer();
908 if (!Init.isInvalid())
909 Init = Actions.CorrectDelayedTyposInExpr(Init.get());
910
911 if (Tok.getLocation() != StartLoc) {
912 // Back out the lexing of the token after the initializer.
913 PP.RevertCachedTokens(1);
914
915 // Replace the consumed tokens with an appropriate annotation.
916 Tok.setLocation(StartLoc);
917 Tok.setKind(tok::annot_primary_expr);
918 setExprAnnotation(Tok, Init);
919 Tok.setAnnotationEndLoc(PP.getLastCachedTokenLocation());
920 PP.AnnotateCachedTokens(Tok);
921
922 // Consume the annotated initializer.
923 ConsumeAnnotationToken();
924 }
925 }
926 } else
927 TryConsumeToken(tok::ellipsis, EllipsisLoc);
928 }
929 // If this is an init capture, process the initialization expression
930 // right away. For lambda init-captures such as the following:
931 // const int x = 10;
932 // auto L = [i = x+1](int a) {
933 // return [j = x+2,
934 // &k = x](char b) { };
935 // };
936 // keep in mind that each lambda init-capture has to have:
937 // - its initialization expression executed in the context
938 // of the enclosing/parent decl-context.
939 // - but the variable itself has to be 'injected' into the
940 // decl-context of its lambda's call-operator (which has
941 // not yet been created).
942 // Each init-expression is a full-expression that has to get
943 // Sema-analyzed (for capturing etc.) before its lambda's
944 // call-operator's decl-context, scope & scopeinfo are pushed on their
945 // respective stacks. Thus if any variable is odr-used in the init-capture
946 // it will correctly get captured in the enclosing lambda, if one exists.
947 // The init-variables above are created later once the lambdascope and
948 // call-operators decl-context is pushed onto its respective stack.
949
950 // Since the lambda init-capture's initializer expression occurs in the
951 // context of the enclosing function or lambda, therefore we can not wait
952 // till a lambda scope has been pushed on before deciding whether the
953 // variable needs to be captured. We also need to process all
954 // lvalue-to-rvalue conversions and discarded-value conversions,
955 // so that we can avoid capturing certain constant variables.
956 // For e.g.,
957 // void test() {
958 // const int x = 10;
959 // auto L = [&z = x](char a) { <-- don't capture by the current lambda
960 // return [y = x](int i) { <-- don't capture by enclosing lambda
961 // return y;
962 // }
963 // };
964 // }
965 // If x was not const, the second use would require 'L' to capture, and
966 // that would be an error.
967
968 ParsedType InitCaptureType;
969 if (!Init.isInvalid())
970 Init = Actions.CorrectDelayedTyposInExpr(Init.get());
971 if (Init.isUsable()) {
972 // Get the pointer and store it in an lvalue, so we can use it as an
973 // out argument.
974 Expr *InitExpr = Init.get();
975 // This performs any lvalue-to-rvalue conversions if necessary, which
976 // can affect what gets captured in the containing decl-context.
977 InitCaptureType = Actions.actOnLambdaInitCaptureInitialization(
978 Loc, Kind == LCK_ByRef, Id, InitKind, InitExpr);
979 Init = InitExpr;
980 }
981 Intro.addCapture(Kind, Loc, Id, EllipsisLoc, InitKind, Init,
982 InitCaptureType);
983 }
984
985 T.consumeClose();
986 Intro.Range.setEnd(T.getCloseLocation());
987 return DiagResult();
988}
989
990/// TryParseLambdaIntroducer - Tentatively parse a lambda introducer.
991///
992/// Returns true if it hit something unexpected.
993bool Parser::TryParseLambdaIntroducer(LambdaIntroducer &Intro) {
994 {
995 bool SkippedInits = false;
996 TentativeParsingAction PA1(*this);
997
998 if (ParseLambdaIntroducer(Intro, &SkippedInits)) {
999 PA1.Revert();
1000 return true;
1001 }
1002
1003 if (!SkippedInits) {
1004 PA1.Commit();
1005 return false;
1006 }
1007
1008 PA1.Revert();
1009 }
1010
1011 // Try to parse it again, but this time parse the init-captures too.
1012 Intro = LambdaIntroducer();
1013 TentativeParsingAction PA2(*this);
1014
1015 if (!ParseLambdaIntroducer(Intro)) {
1016 PA2.Commit();
1017 return false;
1018 }
1019
1020 PA2.Revert();
1021 return true;
1022}
1023
1024static void
1025tryConsumeMutableOrConstexprToken(Parser &P, SourceLocation &MutableLoc,
1026 SourceLocation &ConstexprLoc,
1027 SourceLocation &DeclEndLoc) {
1028 assert(MutableLoc.isInvalid())(static_cast <bool> (MutableLoc.isInvalid()) ? void (0)
: __assert_fail ("MutableLoc.isInvalid()", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1028, __extension__ __PRETTY_FUNCTION__))
;
1029 assert(ConstexprLoc.isInvalid())(static_cast <bool> (ConstexprLoc.isInvalid()) ? void (
0) : __assert_fail ("ConstexprLoc.isInvalid()", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1029, __extension__ __PRETTY_FUNCTION__))
;
1030 // Consume constexpr-opt mutable-opt in any sequence, and set the DeclEndLoc
1031 // to the final of those locations. Emit an error if we have multiple
1032 // copies of those keywords and recover.
1033
1034 while (true) {
1035 switch (P.getCurToken().getKind()) {
1036 case tok::kw_mutable: {
1037 if (MutableLoc.isValid()) {
1038 P.Diag(P.getCurToken().getLocation(),
1039 diag::err_lambda_decl_specifier_repeated)
1040 << 0 << FixItHint::CreateRemoval(P.getCurToken().getLocation());
1041 }
1042 MutableLoc = P.ConsumeToken();
1043 DeclEndLoc = MutableLoc;
1044 break /*switch*/;
1045 }
1046 case tok::kw_constexpr:
1047 if (ConstexprLoc.isValid()) {
1048 P.Diag(P.getCurToken().getLocation(),
1049 diag::err_lambda_decl_specifier_repeated)
1050 << 1 << FixItHint::CreateRemoval(P.getCurToken().getLocation());
1051 }
1052 ConstexprLoc = P.ConsumeToken();
1053 DeclEndLoc = ConstexprLoc;
1054 break /*switch*/;
1055 default:
1056 return;
1057 }
1058 }
1059}
1060
1061static void
1062addConstexprToLambdaDeclSpecifier(Parser &P, SourceLocation ConstexprLoc,
1063 DeclSpec &DS) {
1064 if (ConstexprLoc.isValid()) {
1065 P.Diag(ConstexprLoc, !P.getLangOpts().CPlusPlus1z
1066 ? diag::ext_constexpr_on_lambda_cxx17
1067 : diag::warn_cxx14_compat_constexpr_on_lambda);
1068 const char *PrevSpec = nullptr;
1069 unsigned DiagID = 0;
1070 DS.SetConstexprSpec(ConstexprLoc, PrevSpec, DiagID);
1071 assert(PrevSpec == nullptr && DiagID == 0 &&(static_cast <bool> (PrevSpec == nullptr && DiagID
== 0 && "Constexpr cannot have been set previously!"
) ? void (0) : __assert_fail ("PrevSpec == nullptr && DiagID == 0 && \"Constexpr cannot have been set previously!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1072, __extension__ __PRETTY_FUNCTION__))
1072 "Constexpr cannot have been set previously!")(static_cast <bool> (PrevSpec == nullptr && DiagID
== 0 && "Constexpr cannot have been set previously!"
) ? void (0) : __assert_fail ("PrevSpec == nullptr && DiagID == 0 && \"Constexpr cannot have been set previously!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1072, __extension__ __PRETTY_FUNCTION__))
;
1073 }
1074}
1075
1076/// ParseLambdaExpressionAfterIntroducer - Parse the rest of a lambda
1077/// expression.
1078ExprResult Parser::ParseLambdaExpressionAfterIntroducer(
1079 LambdaIntroducer &Intro) {
1080 SourceLocation LambdaBeginLoc = Intro.Range.getBegin();
1081 Diag(LambdaBeginLoc, diag::warn_cxx98_compat_lambda);
1082
1083 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), LambdaBeginLoc,
1084 "lambda expression parsing");
1085
1086
1087
1088 // FIXME: Call into Actions to add any init-capture declarations to the
1089 // scope while parsing the lambda-declarator and compound-statement.
1090
1091 // Parse lambda-declarator[opt].
1092 DeclSpec DS(AttrFactory);
1093 Declarator D(DS, Declarator::LambdaExprContext);
1094 TemplateParameterDepthRAII CurTemplateDepthTracker(TemplateParameterDepth);
1095 Actions.PushLambdaScope();
1096
1097 ParsedAttributes Attr(AttrFactory);
1098 SourceLocation DeclLoc = Tok.getLocation();
1099 if (getLangOpts().CUDA) {
1100 // In CUDA code, GNU attributes are allowed to appear immediately after the
1101 // "[...]", even if there is no "(...)" before the lambda body.
1102 MaybeParseGNUAttributes(D);
1103 }
1104
1105 // Helper to emit a warning if we see a CUDA host/device/global attribute
1106 // after '(...)'. nvcc doesn't accept this.
1107 auto WarnIfHasCUDATargetAttr = [&] {
1108 if (getLangOpts().CUDA)
1109 for (auto *A = Attr.getList(); A != nullptr; A = A->getNext())
1110 if (A->getKind() == AttributeList::AT_CUDADevice ||
1111 A->getKind() == AttributeList::AT_CUDAHost ||
1112 A->getKind() == AttributeList::AT_CUDAGlobal)
1113 Diag(A->getLoc(), diag::warn_cuda_attr_lambda_position)
1114 << A->getName()->getName();
1115 };
1116
1117 TypeResult TrailingReturnType;
1118 if (Tok.is(tok::l_paren)) {
1119 ParseScope PrototypeScope(this,
1120 Scope::FunctionPrototypeScope |
1121 Scope::FunctionDeclarationScope |
1122 Scope::DeclScope);
1123
1124 BalancedDelimiterTracker T(*this, tok::l_paren);
1125 T.consumeOpen();
1126 SourceLocation LParenLoc = T.getOpenLocation();
1127
1128 // Parse parameter-declaration-clause.
1129 SmallVector<DeclaratorChunk::ParamInfo, 16> ParamInfo;
1130 SourceLocation EllipsisLoc;
1131
1132 if (Tok.isNot(tok::r_paren)) {
1133 Actions.RecordParsingTemplateParameterDepth(TemplateParameterDepth);
1134 ParseParameterDeclarationClause(D, Attr, ParamInfo, EllipsisLoc);
1135 // For a generic lambda, each 'auto' within the parameter declaration
1136 // clause creates a template type parameter, so increment the depth.
1137 if (Actions.getCurGenericLambda())
1138 ++CurTemplateDepthTracker;
1139 }
1140 T.consumeClose();
1141 SourceLocation RParenLoc = T.getCloseLocation();
1142 SourceLocation DeclEndLoc = RParenLoc;
1143
1144 // GNU-style attributes must be parsed before the mutable specifier to be
1145 // compatible with GCC.
1146 MaybeParseGNUAttributes(Attr, &DeclEndLoc);
1147
1148 // MSVC-style attributes must be parsed before the mutable specifier to be
1149 // compatible with MSVC.
1150 MaybeParseMicrosoftDeclSpecs(Attr, &DeclEndLoc);
1151
1152 // Parse mutable-opt and/or constexpr-opt, and update the DeclEndLoc.
1153 SourceLocation MutableLoc;
1154 SourceLocation ConstexprLoc;
1155 tryConsumeMutableOrConstexprToken(*this, MutableLoc, ConstexprLoc,
1156 DeclEndLoc);
1157
1158 addConstexprToLambdaDeclSpecifier(*this, ConstexprLoc, DS);
1159
1160 // Parse exception-specification[opt].
1161 ExceptionSpecificationType ESpecType = EST_None;
1162 SourceRange ESpecRange;
1163 SmallVector<ParsedType, 2> DynamicExceptions;
1164 SmallVector<SourceRange, 2> DynamicExceptionRanges;
1165 ExprResult NoexceptExpr;
1166 CachedTokens *ExceptionSpecTokens;
1167 ESpecType = tryParseExceptionSpecification(/*Delayed=*/false,
1168 ESpecRange,
1169 DynamicExceptions,
1170 DynamicExceptionRanges,
1171 NoexceptExpr,
1172 ExceptionSpecTokens);
1173
1174 if (ESpecType != EST_None)
1175 DeclEndLoc = ESpecRange.getEnd();
1176
1177 // Parse attribute-specifier[opt].
1178 MaybeParseCXX11Attributes(Attr, &DeclEndLoc);
1179
1180 SourceLocation FunLocalRangeEnd = DeclEndLoc;
1181
1182 // Parse trailing-return-type[opt].
1183 if (Tok.is(tok::arrow)) {
1184 FunLocalRangeEnd = Tok.getLocation();
1185 SourceRange Range;
1186 TrailingReturnType = ParseTrailingReturnType(Range);
1187 if (Range.getEnd().isValid())
1188 DeclEndLoc = Range.getEnd();
1189 }
1190
1191 PrototypeScope.Exit();
1192
1193 WarnIfHasCUDATargetAttr();
1194
1195 SourceLocation NoLoc;
1196 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true,
1197 /*isAmbiguous=*/false,
1198 LParenLoc,
1199 ParamInfo.data(), ParamInfo.size(),
1200 EllipsisLoc, RParenLoc,
1201 DS.getTypeQualifiers(),
1202 /*RefQualifierIsLValueRef=*/true,
1203 /*RefQualifierLoc=*/NoLoc,
1204 /*ConstQualifierLoc=*/NoLoc,
1205 /*VolatileQualifierLoc=*/NoLoc,
1206 /*RestrictQualifierLoc=*/NoLoc,
1207 MutableLoc,
1208 ESpecType, ESpecRange,
1209 DynamicExceptions.data(),
1210 DynamicExceptionRanges.data(),
1211 DynamicExceptions.size(),
1212 NoexceptExpr.isUsable() ?
1213 NoexceptExpr.get() : nullptr,
1214 /*ExceptionSpecTokens*/nullptr,
1215 /*DeclsInPrototype=*/None,
1216 LParenLoc, FunLocalRangeEnd, D,
1217 TrailingReturnType),
1218 Attr, DeclEndLoc);
1219 } else if (Tok.isOneOf(tok::kw_mutable, tok::arrow, tok::kw___attribute,
1220 tok::kw_constexpr) ||
1221 (Tok.is(tok::l_square) && NextToken().is(tok::l_square))) {
1222 // It's common to forget that one needs '()' before 'mutable', an attribute
1223 // specifier, or the result type. Deal with this.
1224 unsigned TokKind = 0;
1225 switch (Tok.getKind()) {
1226 case tok::kw_mutable: TokKind = 0; break;
1227 case tok::arrow: TokKind = 1; break;
1228 case tok::kw___attribute:
1229 case tok::l_square: TokKind = 2; break;
1230 case tok::kw_constexpr: TokKind = 3; break;
1231 default: llvm_unreachable("Unknown token kind")::llvm::llvm_unreachable_internal("Unknown token kind", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1231)
;
1232 }
1233
1234 Diag(Tok, diag::err_lambda_missing_parens)
1235 << TokKind
1236 << FixItHint::CreateInsertion(Tok.getLocation(), "() ");
1237 SourceLocation DeclEndLoc = DeclLoc;
1238
1239 // GNU-style attributes must be parsed before the mutable specifier to be
1240 // compatible with GCC.
1241 MaybeParseGNUAttributes(Attr, &DeclEndLoc);
1242
1243 // Parse 'mutable', if it's there.
1244 SourceLocation MutableLoc;
1245 if (Tok.is(tok::kw_mutable)) {
1246 MutableLoc = ConsumeToken();
1247 DeclEndLoc = MutableLoc;
1248 }
1249
1250 // Parse attribute-specifier[opt].
1251 MaybeParseCXX11Attributes(Attr, &DeclEndLoc);
1252
1253 // Parse the return type, if there is one.
1254 if (Tok.is(tok::arrow)) {
1255 SourceRange Range;
1256 TrailingReturnType = ParseTrailingReturnType(Range);
1257 if (Range.getEnd().isValid())
1258 DeclEndLoc = Range.getEnd();
1259 }
1260
1261 WarnIfHasCUDATargetAttr();
1262
1263 SourceLocation NoLoc;
1264 D.AddTypeInfo(DeclaratorChunk::getFunction(/*hasProto=*/true,
1265 /*isAmbiguous=*/false,
1266 /*LParenLoc=*/NoLoc,
1267 /*Params=*/nullptr,
1268 /*NumParams=*/0,
1269 /*EllipsisLoc=*/NoLoc,
1270 /*RParenLoc=*/NoLoc,
1271 /*TypeQuals=*/0,
1272 /*RefQualifierIsLValueRef=*/true,
1273 /*RefQualifierLoc=*/NoLoc,
1274 /*ConstQualifierLoc=*/NoLoc,
1275 /*VolatileQualifierLoc=*/NoLoc,
1276 /*RestrictQualifierLoc=*/NoLoc,
1277 MutableLoc,
1278 EST_None,
1279 /*ESpecRange=*/SourceRange(),
1280 /*Exceptions=*/nullptr,
1281 /*ExceptionRanges=*/nullptr,
1282 /*NumExceptions=*/0,
1283 /*NoexceptExpr=*/nullptr,
1284 /*ExceptionSpecTokens=*/nullptr,
1285 /*DeclsInPrototype=*/None,
1286 DeclLoc, DeclEndLoc, D,
1287 TrailingReturnType),
1288 Attr, DeclEndLoc);
1289 }
1290
1291 // FIXME: Rename BlockScope -> ClosureScope if we decide to continue using
1292 // it.
1293 unsigned ScopeFlags = Scope::BlockScope | Scope::FnScope | Scope::DeclScope |
1294 Scope::CompoundStmtScope;
1295 ParseScope BodyScope(this, ScopeFlags);
1296
1297 Actions.ActOnStartOfLambdaDefinition(Intro, D, getCurScope());
1298
1299 // Parse compound-statement.
1300 if (!Tok.is(tok::l_brace)) {
1301 Diag(Tok, diag::err_expected_lambda_body);
1302 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1303 return ExprError();
1304 }
1305
1306 StmtResult Stmt(ParseCompoundStatementBody());
1307 BodyScope.Exit();
1308
1309 if (!Stmt.isInvalid() && !TrailingReturnType.isInvalid())
1310 return Actions.ActOnLambdaExpr(LambdaBeginLoc, Stmt.get(), getCurScope());
1311
1312 Actions.ActOnLambdaError(LambdaBeginLoc, getCurScope());
1313 return ExprError();
1314}
1315
1316/// ParseCXXCasts - This handles the various ways to cast expressions to another
1317/// type.
1318///
1319/// postfix-expression: [C++ 5.2p1]
1320/// 'dynamic_cast' '<' type-name '>' '(' expression ')'
1321/// 'static_cast' '<' type-name '>' '(' expression ')'
1322/// 'reinterpret_cast' '<' type-name '>' '(' expression ')'
1323/// 'const_cast' '<' type-name '>' '(' expression ')'
1324///
1325ExprResult Parser::ParseCXXCasts() {
1326 tok::TokenKind Kind = Tok.getKind();
1327 const char *CastName = nullptr; // For error messages
1328
1329 switch (Kind) {
1330 default: llvm_unreachable("Unknown C++ cast!")::llvm::llvm_unreachable_internal("Unknown C++ cast!", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1330)
;
1331 case tok::kw_const_cast: CastName = "const_cast"; break;
1332 case tok::kw_dynamic_cast: CastName = "dynamic_cast"; break;
1333 case tok::kw_reinterpret_cast: CastName = "reinterpret_cast"; break;
1334 case tok::kw_static_cast: CastName = "static_cast"; break;
1335 }
1336
1337 SourceLocation OpLoc = ConsumeToken();
1338 SourceLocation LAngleBracketLoc = Tok.getLocation();
1339
1340 // Check for "<::" which is parsed as "[:". If found, fix token stream,
1341 // diagnose error, suggest fix, and recover parsing.
1342 if (Tok.is(tok::l_square) && Tok.getLength() == 2) {
1343 Token Next = NextToken();
1344 if (Next.is(tok::colon) && areTokensAdjacent(Tok, Next))
1345 FixDigraph(*this, PP, Tok, Next, Kind, /*AtDigraph*/true);
1346 }
1347
1348 if (ExpectAndConsume(tok::less, diag::err_expected_less_after, CastName))
1349 return ExprError();
1350
1351 // Parse the common declaration-specifiers piece.
1352 DeclSpec DS(AttrFactory);
1353 ParseSpecifierQualifierList(DS);
1354
1355 // Parse the abstract-declarator, if present.
1356 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1357 ParseDeclarator(DeclaratorInfo);
1358
1359 SourceLocation RAngleBracketLoc = Tok.getLocation();
1360
1361 if (ExpectAndConsume(tok::greater))
1362 return ExprError(Diag(LAngleBracketLoc, diag::note_matching) << tok::less);
1363
1364 BalancedDelimiterTracker T(*this, tok::l_paren);
1365
1366 if (T.expectAndConsume(diag::err_expected_lparen_after, CastName))
1367 return ExprError();
1368
1369 ExprResult Result = ParseExpression();
1370
1371 // Match the ')'.
1372 T.consumeClose();
1373
1374 if (!Result.isInvalid() && !DeclaratorInfo.isInvalidType())
1375 Result = Actions.ActOnCXXNamedCast(OpLoc, Kind,
1376 LAngleBracketLoc, DeclaratorInfo,
1377 RAngleBracketLoc,
1378 T.getOpenLocation(), Result.get(),
1379 T.getCloseLocation());
1380
1381 return Result;
1382}
1383
1384/// ParseCXXTypeid - This handles the C++ typeid expression.
1385///
1386/// postfix-expression: [C++ 5.2p1]
1387/// 'typeid' '(' expression ')'
1388/// 'typeid' '(' type-id ')'
1389///
1390ExprResult Parser::ParseCXXTypeid() {
1391 assert(Tok.is(tok::kw_typeid) && "Not 'typeid'!")(static_cast <bool> (Tok.is(tok::kw_typeid) && "Not 'typeid'!"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_typeid) && \"Not 'typeid'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1391, __extension__ __PRETTY_FUNCTION__))
;
1392
1393 SourceLocation OpLoc = ConsumeToken();
1394 SourceLocation LParenLoc, RParenLoc;
1395 BalancedDelimiterTracker T(*this, tok::l_paren);
1396
1397 // typeid expressions are always parenthesized.
1398 if (T.expectAndConsume(diag::err_expected_lparen_after, "typeid"))
1399 return ExprError();
1400 LParenLoc = T.getOpenLocation();
1401
1402 ExprResult Result;
1403
1404 // C++0x [expr.typeid]p3:
1405 // When typeid is applied to an expression other than an lvalue of a
1406 // polymorphic class type [...] The expression is an unevaluated
1407 // operand (Clause 5).
1408 //
1409 // Note that we can't tell whether the expression is an lvalue of a
1410 // polymorphic class type until after we've parsed the expression; we
1411 // speculatively assume the subexpression is unevaluated, and fix it up
1412 // later.
1413 //
1414 // We enter the unevaluated context before trying to determine whether we
1415 // have a type-id, because the tentative parse logic will try to resolve
1416 // names, and must treat them as unevaluated.
1417 EnterExpressionEvaluationContext Unevaluated(
1418 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
1419 Sema::ReuseLambdaContextDecl);
1420
1421 if (isTypeIdInParens()) {
1422 TypeResult Ty = ParseTypeName();
1423
1424 // Match the ')'.
1425 T.consumeClose();
1426 RParenLoc = T.getCloseLocation();
1427 if (Ty.isInvalid() || RParenLoc.isInvalid())
1428 return ExprError();
1429
1430 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/true,
1431 Ty.get().getAsOpaquePtr(), RParenLoc);
1432 } else {
1433 Result = ParseExpression();
1434
1435 // Match the ')'.
1436 if (Result.isInvalid())
1437 SkipUntil(tok::r_paren, StopAtSemi);
1438 else {
1439 T.consumeClose();
1440 RParenLoc = T.getCloseLocation();
1441 if (RParenLoc.isInvalid())
1442 return ExprError();
1443
1444 Result = Actions.ActOnCXXTypeid(OpLoc, LParenLoc, /*isType=*/false,
1445 Result.get(), RParenLoc);
1446 }
1447 }
1448
1449 return Result;
1450}
1451
1452/// ParseCXXUuidof - This handles the Microsoft C++ __uuidof expression.
1453///
1454/// '__uuidof' '(' expression ')'
1455/// '__uuidof' '(' type-id ')'
1456///
1457ExprResult Parser::ParseCXXUuidof() {
1458 assert(Tok.is(tok::kw___uuidof) && "Not '__uuidof'!")(static_cast <bool> (Tok.is(tok::kw___uuidof) &&
"Not '__uuidof'!") ? void (0) : __assert_fail ("Tok.is(tok::kw___uuidof) && \"Not '__uuidof'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1458, __extension__ __PRETTY_FUNCTION__))
;
1459
1460 SourceLocation OpLoc = ConsumeToken();
1461 BalancedDelimiterTracker T(*this, tok::l_paren);
1462
1463 // __uuidof expressions are always parenthesized.
1464 if (T.expectAndConsume(diag::err_expected_lparen_after, "__uuidof"))
1465 return ExprError();
1466
1467 ExprResult Result;
1468
1469 if (isTypeIdInParens()) {
1470 TypeResult Ty = ParseTypeName();
1471
1472 // Match the ')'.
1473 T.consumeClose();
1474
1475 if (Ty.isInvalid())
1476 return ExprError();
1477
1478 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(), /*isType=*/true,
1479 Ty.get().getAsOpaquePtr(),
1480 T.getCloseLocation());
1481 } else {
1482 EnterExpressionEvaluationContext Unevaluated(
1483 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
1484 Result = ParseExpression();
1485
1486 // Match the ')'.
1487 if (Result.isInvalid())
1488 SkipUntil(tok::r_paren, StopAtSemi);
1489 else {
1490 T.consumeClose();
1491
1492 Result = Actions.ActOnCXXUuidof(OpLoc, T.getOpenLocation(),
1493 /*isType=*/false,
1494 Result.get(), T.getCloseLocation());
1495 }
1496 }
1497
1498 return Result;
1499}
1500
1501/// \brief Parse a C++ pseudo-destructor expression after the base,
1502/// . or -> operator, and nested-name-specifier have already been
1503/// parsed.
1504///
1505/// postfix-expression: [C++ 5.2]
1506/// postfix-expression . pseudo-destructor-name
1507/// postfix-expression -> pseudo-destructor-name
1508///
1509/// pseudo-destructor-name:
1510/// ::[opt] nested-name-specifier[opt] type-name :: ~type-name
1511/// ::[opt] nested-name-specifier template simple-template-id ::
1512/// ~type-name
1513/// ::[opt] nested-name-specifier[opt] ~type-name
1514///
1515ExprResult
1516Parser::ParseCXXPseudoDestructor(Expr *Base, SourceLocation OpLoc,
1517 tok::TokenKind OpKind,
1518 CXXScopeSpec &SS,
1519 ParsedType ObjectType) {
1520 // We're parsing either a pseudo-destructor-name or a dependent
1521 // member access that has the same form as a
1522 // pseudo-destructor-name. We parse both in the same way and let
1523 // the action model sort them out.
1524 //
1525 // Note that the ::[opt] nested-name-specifier[opt] has already
1526 // been parsed, and if there was a simple-template-id, it has
1527 // been coalesced into a template-id annotation token.
1528 UnqualifiedId FirstTypeName;
1529 SourceLocation CCLoc;
1530 if (Tok.is(tok::identifier)) {
1531 FirstTypeName.setIdentifier(Tok.getIdentifierInfo(), Tok.getLocation());
1532 ConsumeToken();
1533 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail")(static_cast <bool> (Tok.is(tok::coloncolon) &&
"ParseOptionalCXXScopeSpecifier fail") ? void (0) : __assert_fail
("Tok.is(tok::coloncolon) &&\"ParseOptionalCXXScopeSpecifier fail\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1533, __extension__ __PRETTY_FUNCTION__))
;
1534 CCLoc = ConsumeToken();
1535 } else if (Tok.is(tok::annot_template_id)) {
1536 // FIXME: retrieve TemplateKWLoc from template-id annotation and
1537 // store it in the pseudo-dtor node (to be used when instantiating it).
1538 FirstTypeName.setTemplateId(
1539 (TemplateIdAnnotation *)Tok.getAnnotationValue());
1540 ConsumeAnnotationToken();
1541 assert(Tok.is(tok::coloncolon) &&"ParseOptionalCXXScopeSpecifier fail")(static_cast <bool> (Tok.is(tok::coloncolon) &&
"ParseOptionalCXXScopeSpecifier fail") ? void (0) : __assert_fail
("Tok.is(tok::coloncolon) &&\"ParseOptionalCXXScopeSpecifier fail\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1541, __extension__ __PRETTY_FUNCTION__))
;
1542 CCLoc = ConsumeToken();
1543 } else {
1544 FirstTypeName.setIdentifier(nullptr, SourceLocation());
1545 }
1546
1547 // Parse the tilde.
1548 assert(Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail")(static_cast <bool> (Tok.is(tok::tilde) && "ParseOptionalCXXScopeSpecifier fail"
) ? void (0) : __assert_fail ("Tok.is(tok::tilde) && \"ParseOptionalCXXScopeSpecifier fail\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1548, __extension__ __PRETTY_FUNCTION__))
;
1549 SourceLocation TildeLoc = ConsumeToken();
1550
1551 if (Tok.is(tok::kw_decltype) && !FirstTypeName.isValid() && SS.isEmpty()) {
1552 DeclSpec DS(AttrFactory);
1553 ParseDecltypeSpecifier(DS);
1554 if (DS.getTypeSpecType() == TST_error)
1555 return ExprError();
1556 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1557 TildeLoc, DS);
1558 }
1559
1560 if (!Tok.is(tok::identifier)) {
1561 Diag(Tok, diag::err_destructor_tilde_identifier);
1562 return ExprError();
1563 }
1564
1565 // Parse the second type.
1566 UnqualifiedId SecondTypeName;
1567 IdentifierInfo *Name = Tok.getIdentifierInfo();
1568 SourceLocation NameLoc = ConsumeToken();
1569 SecondTypeName.setIdentifier(Name, NameLoc);
1570
1571 // If there is a '<', the second type name is a template-id. Parse
1572 // it as such.
1573 if (Tok.is(tok::less) &&
1574 ParseUnqualifiedIdTemplateId(SS, SourceLocation(),
1575 Name, NameLoc,
1576 false, ObjectType, SecondTypeName,
1577 /*AssumeTemplateName=*/true))
1578 return ExprError();
1579
1580 return Actions.ActOnPseudoDestructorExpr(getCurScope(), Base, OpLoc, OpKind,
1581 SS, FirstTypeName, CCLoc, TildeLoc,
1582 SecondTypeName);
1583}
1584
1585/// ParseCXXBoolLiteral - This handles the C++ Boolean literals.
1586///
1587/// boolean-literal: [C++ 2.13.5]
1588/// 'true'
1589/// 'false'
1590ExprResult Parser::ParseCXXBoolLiteral() {
1591 tok::TokenKind Kind = Tok.getKind();
1592 return Actions.ActOnCXXBoolLiteral(ConsumeToken(), Kind);
1593}
1594
1595/// ParseThrowExpression - This handles the C++ throw expression.
1596///
1597/// throw-expression: [C++ 15]
1598/// 'throw' assignment-expression[opt]
1599ExprResult Parser::ParseThrowExpression() {
1600 assert(Tok.is(tok::kw_throw) && "Not throw!")(static_cast <bool> (Tok.is(tok::kw_throw) && "Not throw!"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_throw) && \"Not throw!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1600, __extension__ __PRETTY_FUNCTION__))
;
1601 SourceLocation ThrowLoc = ConsumeToken(); // Eat the throw token.
1602
1603 // If the current token isn't the start of an assignment-expression,
1604 // then the expression is not present. This handles things like:
1605 // "C ? throw : (void)42", which is crazy but legal.
1606 switch (Tok.getKind()) { // FIXME: move this predicate somewhere common.
1607 case tok::semi:
1608 case tok::r_paren:
1609 case tok::r_square:
1610 case tok::r_brace:
1611 case tok::colon:
1612 case tok::comma:
1613 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, nullptr);
1614
1615 default:
1616 ExprResult Expr(ParseAssignmentExpression());
1617 if (Expr.isInvalid()) return Expr;
1618 return Actions.ActOnCXXThrow(getCurScope(), ThrowLoc, Expr.get());
1619 }
1620}
1621
1622/// \brief Parse the C++ Coroutines co_yield expression.
1623///
1624/// co_yield-expression:
1625/// 'co_yield' assignment-expression[opt]
1626ExprResult Parser::ParseCoyieldExpression() {
1627 assert(Tok.is(tok::kw_co_yield) && "Not co_yield!")(static_cast <bool> (Tok.is(tok::kw_co_yield) &&
"Not co_yield!") ? void (0) : __assert_fail ("Tok.is(tok::kw_co_yield) && \"Not co_yield!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1627, __extension__ __PRETTY_FUNCTION__))
;
1628
1629 SourceLocation Loc = ConsumeToken();
1630 ExprResult Expr = Tok.is(tok::l_brace) ? ParseBraceInitializer()
1631 : ParseAssignmentExpression();
1632 if (!Expr.isInvalid())
1633 Expr = Actions.ActOnCoyieldExpr(getCurScope(), Loc, Expr.get());
1634 return Expr;
1635}
1636
1637/// ParseCXXThis - This handles the C++ 'this' pointer.
1638///
1639/// C++ 9.3.2: In the body of a non-static member function, the keyword this is
1640/// a non-lvalue expression whose value is the address of the object for which
1641/// the function is called.
1642ExprResult Parser::ParseCXXThis() {
1643 assert(Tok.is(tok::kw_this) && "Not 'this'!")(static_cast <bool> (Tok.is(tok::kw_this) && "Not 'this'!"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_this) && \"Not 'this'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1643, __extension__ __PRETTY_FUNCTION__))
;
1644 SourceLocation ThisLoc = ConsumeToken();
1645 return Actions.ActOnCXXThis(ThisLoc);
1646}
1647
1648/// ParseCXXTypeConstructExpression - Parse construction of a specified type.
1649/// Can be interpreted either as function-style casting ("int(x)")
1650/// or class type construction ("ClassType(x,y,z)")
1651/// or creation of a value-initialized type ("int()").
1652/// See [C++ 5.2.3].
1653///
1654/// postfix-expression: [C++ 5.2p1]
1655/// simple-type-specifier '(' expression-list[opt] ')'
1656/// [C++0x] simple-type-specifier braced-init-list
1657/// typename-specifier '(' expression-list[opt] ')'
1658/// [C++0x] typename-specifier braced-init-list
1659///
1660/// In C++1z onwards, the type specifier can also be a template-name.
1661ExprResult
1662Parser::ParseCXXTypeConstructExpression(const DeclSpec &DS) {
1663 Declarator DeclaratorInfo(DS, Declarator::FunctionalCastContext);
1664 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo).get();
1665
1666 assert((Tok.is(tok::l_paren) ||(static_cast <bool> ((Tok.is(tok::l_paren) || (getLangOpts
().CPlusPlus11 && Tok.is(tok::l_brace))) && "Expected '(' or '{'!"
) ? void (0) : __assert_fail ("(Tok.is(tok::l_paren) || (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace))) && \"Expected '(' or '{'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1668, __extension__ __PRETTY_FUNCTION__))
1667 (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)))(static_cast <bool> ((Tok.is(tok::l_paren) || (getLangOpts
().CPlusPlus11 && Tok.is(tok::l_brace))) && "Expected '(' or '{'!"
) ? void (0) : __assert_fail ("(Tok.is(tok::l_paren) || (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace))) && \"Expected '(' or '{'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1668, __extension__ __PRETTY_FUNCTION__))
1668 && "Expected '(' or '{'!")(static_cast <bool> ((Tok.is(tok::l_paren) || (getLangOpts
().CPlusPlus11 && Tok.is(tok::l_brace))) && "Expected '(' or '{'!"
) ? void (0) : __assert_fail ("(Tok.is(tok::l_paren) || (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace))) && \"Expected '(' or '{'!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1668, __extension__ __PRETTY_FUNCTION__))
;
1669
1670 if (Tok.is(tok::l_brace)) {
1671 ExprResult Init = ParseBraceInitializer();
1672 if (Init.isInvalid())
1673 return Init;
1674 Expr *InitList = Init.get();
1675 return Actions.ActOnCXXTypeConstructExpr(TypeRep, SourceLocation(),
1676 MultiExprArg(&InitList, 1),
1677 SourceLocation());
1678 } else {
1679 BalancedDelimiterTracker T(*this, tok::l_paren);
1680 T.consumeOpen();
1681
1682 ExprVector Exprs;
1683 CommaLocsTy CommaLocs;
1684
1685 if (Tok.isNot(tok::r_paren)) {
1686 if (ParseExpressionList(Exprs, CommaLocs, [&] {
1687 Actions.CodeCompleteConstructor(getCurScope(),
1688 TypeRep.get()->getCanonicalTypeInternal(),
1689 DS.getLocEnd(), Exprs);
1690 })) {
1691 SkipUntil(tok::r_paren, StopAtSemi);
1692 return ExprError();
1693 }
1694 }
1695
1696 // Match the ')'.
1697 T.consumeClose();
1698
1699 // TypeRep could be null, if it references an invalid typedef.
1700 if (!TypeRep)
1701 return ExprError();
1702
1703 assert((Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&&(static_cast <bool> ((Exprs.size() == 0 || Exprs.size()
-1 == CommaLocs.size())&& "Unexpected number of commas!"
) ? void (0) : __assert_fail ("(Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& \"Unexpected number of commas!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1704, __extension__ __PRETTY_FUNCTION__))
1704 "Unexpected number of commas!")(static_cast <bool> ((Exprs.size() == 0 || Exprs.size()
-1 == CommaLocs.size())&& "Unexpected number of commas!"
) ? void (0) : __assert_fail ("(Exprs.size() == 0 || Exprs.size()-1 == CommaLocs.size())&& \"Unexpected number of commas!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1704, __extension__ __PRETTY_FUNCTION__))
;
1705 return Actions.ActOnCXXTypeConstructExpr(TypeRep, T.getOpenLocation(),
1706 Exprs,
1707 T.getCloseLocation());
1708 }
1709}
1710
1711/// ParseCXXCondition - if/switch/while condition expression.
1712///
1713/// condition:
1714/// expression
1715/// type-specifier-seq declarator '=' assignment-expression
1716/// [C++11] type-specifier-seq declarator '=' initializer-clause
1717/// [C++11] type-specifier-seq declarator braced-init-list
1718/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt]
1719/// '=' assignment-expression
1720///
1721/// In C++1z, a condition may in some contexts be preceded by an
1722/// optional init-statement. This function will parse that too.
1723///
1724/// \param InitStmt If non-null, an init-statement is permitted, and if present
1725/// will be parsed and stored here.
1726///
1727/// \param Loc The location of the start of the statement that requires this
1728/// condition, e.g., the "for" in a for loop.
1729///
1730/// \returns The parsed condition.
1731Sema::ConditionResult Parser::ParseCXXCondition(StmtResult *InitStmt,
1732 SourceLocation Loc,
1733 Sema::ConditionKind CK) {
1734 if (Tok.is(tok::code_completion)) {
1
Taking false branch
8
Taking false branch
1735 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition);
1736 cutOffParsing();
1737 return Sema::ConditionError();
1738 }
1739
1740 ParsedAttributesWithRange attrs(AttrFactory);
1741 MaybeParseCXX11Attributes(attrs);
1742
1743 // Determine what kind of thing we have.
1744 switch (isCXXConditionDeclarationOrInitStatement(InitStmt)) {
2
Control jumps to 'case InitStmtDecl:' at line 1762
9
Control jumps to 'case InitStmtDecl:' at line 1762
1745 case ConditionOrInitStatement::Expression: {
1746 ProhibitAttributes(attrs);
1747
1748 // Parse the expression.
1749 ExprResult Expr = ParseExpression(); // expression
1750 if (Expr.isInvalid())
1751 return Sema::ConditionError();
1752
1753 if (InitStmt && Tok.is(tok::semi)) {
1754 *InitStmt = Actions.ActOnExprStmt(Expr.get());
1755 ConsumeToken();
1756 return ParseCXXCondition(nullptr, Loc, CK);
1757 }
1758
1759 return Actions.ActOnCondition(getCurScope(), Loc, Expr.get(), CK);
1760 }
1761
1762 case ConditionOrInitStatement::InitStmtDecl: {
1763 Diag(Tok.getLocation(), getLangOpts().CPlusPlus1z
3
Assuming the condition is false
4
'?' condition is false
10
Assuming the condition is false
11
'?' condition is false
1764 ? diag::warn_cxx14_compat_init_statement
1765 : diag::ext_init_statement)
1766 << (CK == Sema::ConditionKind::Switch);
5
Assuming 'CK' is not equal to Switch
1767 SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
1768 DeclGroupPtrTy DG = ParseSimpleDeclaration(
1769 Declarator::InitStmtContext, DeclEnd, attrs, /*RequireSemi=*/true);
1770 *InitStmt = Actions.ActOnDeclStmt(DG, DeclStart, DeclEnd);
12
Called C++ object pointer is null
1771 return ParseCXXCondition(nullptr, Loc, CK);
6
Passing null pointer value via 1st parameter 'InitStmt'
7
Calling 'Parser::ParseCXXCondition'
1772 }
1773
1774 case ConditionOrInitStatement::ConditionDecl:
1775 case ConditionOrInitStatement::Error:
1776 break;
1777 }
1778
1779 // type-specifier-seq
1780 DeclSpec DS(AttrFactory);
1781 DS.takeAttributesFrom(attrs);
1782 ParseSpecifierQualifierList(DS, AS_none, DSC_condition);
1783
1784 // declarator
1785 Declarator DeclaratorInfo(DS, Declarator::ConditionContext);
1786 ParseDeclarator(DeclaratorInfo);
1787
1788 // simple-asm-expr[opt]
1789 if (Tok.is(tok::kw_asm)) {
1790 SourceLocation Loc;
1791 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1792 if (AsmLabel.isInvalid()) {
1793 SkipUntil(tok::semi, StopAtSemi);
1794 return Sema::ConditionError();
1795 }
1796 DeclaratorInfo.setAsmLabel(AsmLabel.get());
1797 DeclaratorInfo.SetRangeEnd(Loc);
1798 }
1799
1800 // If attributes are present, parse them.
1801 MaybeParseGNUAttributes(DeclaratorInfo);
1802
1803 // Type-check the declaration itself.
1804 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(),
1805 DeclaratorInfo);
1806 if (Dcl.isInvalid())
1807 return Sema::ConditionError();
1808 Decl *DeclOut = Dcl.get();
1809
1810 // '=' assignment-expression
1811 // If a '==' or '+=' is found, suggest a fixit to '='.
1812 bool CopyInitialization = isTokenEqualOrEqualTypo();
1813 if (CopyInitialization)
1814 ConsumeToken();
1815
1816 ExprResult InitExpr = ExprError();
1817 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1818 Diag(Tok.getLocation(),
1819 diag::warn_cxx98_compat_generalized_initializer_lists);
1820 InitExpr = ParseBraceInitializer();
1821 } else if (CopyInitialization) {
1822 InitExpr = ParseAssignmentExpression();
1823 } else if (Tok.is(tok::l_paren)) {
1824 // This was probably an attempt to initialize the variable.
1825 SourceLocation LParen = ConsumeParen(), RParen = LParen;
1826 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch))
1827 RParen = ConsumeParen();
1828 Diag(DeclOut->getLocation(),
1829 diag::err_expected_init_in_condition_lparen)
1830 << SourceRange(LParen, RParen);
1831 } else {
1832 Diag(DeclOut->getLocation(), diag::err_expected_init_in_condition);
1833 }
1834
1835 if (!InitExpr.isInvalid())
1836 Actions.AddInitializerToDecl(DeclOut, InitExpr.get(), !CopyInitialization);
1837 else
1838 Actions.ActOnInitializerError(DeclOut);
1839
1840 Actions.FinalizeDeclaration(DeclOut);
1841 return Actions.ActOnConditionVariable(DeclOut, Loc, CK);
1842}
1843
1844/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers.
1845/// This should only be called when the current token is known to be part of
1846/// simple-type-specifier.
1847///
1848/// simple-type-specifier:
1849/// '::'[opt] nested-name-specifier[opt] type-name
1850/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO]
1851/// char
1852/// wchar_t
1853/// bool
1854/// short
1855/// int
1856/// long
1857/// signed
1858/// unsigned
1859/// float
1860/// double
1861/// void
1862/// [GNU] typeof-specifier
1863/// [C++0x] auto [TODO]
1864///
1865/// type-name:
1866/// class-name
1867/// enum-name
1868/// typedef-name
1869///
1870void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) {
1871 DS.SetRangeStart(Tok.getLocation());
1872 const char *PrevSpec;
1873 unsigned DiagID;
1874 SourceLocation Loc = Tok.getLocation();
1875 const clang::PrintingPolicy &Policy =
1876 Actions.getASTContext().getPrintingPolicy();
1877
1878 switch (Tok.getKind()) {
1879 case tok::identifier: // foo::bar
1880 case tok::coloncolon: // ::foo::bar
1881 llvm_unreachable("Annotation token should already be formed!")::llvm::llvm_unreachable_internal("Annotation token should already be formed!"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1881)
;
1882 default:
1883 llvm_unreachable("Not a simple-type-specifier token!")::llvm::llvm_unreachable_internal("Not a simple-type-specifier token!"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1883)
;
1884
1885 // type-name
1886 case tok::annot_typename: {
1887 if (getTypeAnnotation(Tok))
1888 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID,
1889 getTypeAnnotation(Tok), Policy);
1890 else
1891 DS.SetTypeSpecError();
1892
1893 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1894 ConsumeAnnotationToken();
1895
1896 DS.Finish(Actions, Policy);
1897 return;
1898 }
1899
1900 // builtin types
1901 case tok::kw_short:
1902 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID, Policy);
1903 break;
1904 case tok::kw_long:
1905 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID, Policy);
1906 break;
1907 case tok::kw___int64:
1908 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID, Policy);
1909 break;
1910 case tok::kw_signed:
1911 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID);
1912 break;
1913 case tok::kw_unsigned:
1914 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID);
1915 break;
1916 case tok::kw_void:
1917 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID, Policy);
1918 break;
1919 case tok::kw_char:
1920 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID, Policy);
1921 break;
1922 case tok::kw_int:
1923 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID, Policy);
1924 break;
1925 case tok::kw___int128:
1926 DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, DiagID, Policy);
1927 break;
1928 case tok::kw_half:
1929 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID, Policy);
1930 break;
1931 case tok::kw_float:
1932 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID, Policy);
1933 break;
1934 case tok::kw_double:
1935 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID, Policy);
1936 break;
1937 case tok::kw__Float16:
1938 DS.SetTypeSpecType(DeclSpec::TST_float16, Loc, PrevSpec, DiagID, Policy);
1939 break;
1940 case tok::kw___float128:
1941 DS.SetTypeSpecType(DeclSpec::TST_float128, Loc, PrevSpec, DiagID, Policy);
1942 break;
1943 case tok::kw_wchar_t:
1944 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID, Policy);
1945 break;
1946 case tok::kw_char16_t:
1947 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID, Policy);
1948 break;
1949 case tok::kw_char32_t:
1950 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID, Policy);
1951 break;
1952 case tok::kw_bool:
1953 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID, Policy);
1954 break;
1955 case tok::annot_decltype:
1956 case tok::kw_decltype:
1957 DS.SetRangeEnd(ParseDecltypeSpecifier(DS));
1958 return DS.Finish(Actions, Policy);
1959
1960 // GNU typeof support.
1961 case tok::kw_typeof:
1962 ParseTypeofSpecifier(DS);
1963 DS.Finish(Actions, Policy);
1964 return;
1965 }
1966 ConsumeAnyToken();
1967 DS.SetRangeEnd(PrevTokLocation);
1968 DS.Finish(Actions, Policy);
1969}
1970
1971/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++
1972/// [dcl.name]), which is a non-empty sequence of type-specifiers,
1973/// e.g., "const short int". Note that the DeclSpec is *not* finished
1974/// by parsing the type-specifier-seq, because these sequences are
1975/// typically followed by some form of declarator. Returns true and
1976/// emits diagnostics if this is not a type-specifier-seq, false
1977/// otherwise.
1978///
1979/// type-specifier-seq: [C++ 8.1]
1980/// type-specifier type-specifier-seq[opt]
1981///
1982bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) {
1983 ParseSpecifierQualifierList(DS, AS_none, DSC_type_specifier);
1984 DS.Finish(Actions, Actions.getASTContext().getPrintingPolicy());
1985 return false;
1986}
1987
1988/// \brief Finish parsing a C++ unqualified-id that is a template-id of
1989/// some form.
1990///
1991/// This routine is invoked when a '<' is encountered after an identifier or
1992/// operator-function-id is parsed by \c ParseUnqualifiedId() to determine
1993/// whether the unqualified-id is actually a template-id. This routine will
1994/// then parse the template arguments and form the appropriate template-id to
1995/// return to the caller.
1996///
1997/// \param SS the nested-name-specifier that precedes this template-id, if
1998/// we're actually parsing a qualified-id.
1999///
2000/// \param Name for constructor and destructor names, this is the actual
2001/// identifier that may be a template-name.
2002///
2003/// \param NameLoc the location of the class-name in a constructor or
2004/// destructor.
2005///
2006/// \param EnteringContext whether we're entering the scope of the
2007/// nested-name-specifier.
2008///
2009/// \param ObjectType if this unqualified-id occurs within a member access
2010/// expression, the type of the base object whose member is being accessed.
2011///
2012/// \param Id as input, describes the template-name or operator-function-id
2013/// that precedes the '<'. If template arguments were parsed successfully,
2014/// will be updated with the template-id.
2015///
2016/// \param AssumeTemplateId When true, this routine will assume that the name
2017/// refers to a template without performing name lookup to verify.
2018///
2019/// \returns true if a parse error occurred, false otherwise.
2020bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS,
2021 SourceLocation TemplateKWLoc,
2022 IdentifierInfo *Name,
2023 SourceLocation NameLoc,
2024 bool EnteringContext,
2025 ParsedType ObjectType,
2026 UnqualifiedId &Id,
2027 bool AssumeTemplateId) {
2028 assert((AssumeTemplateId || Tok.is(tok::less)) &&(static_cast <bool> ((AssumeTemplateId || Tok.is(tok::less
)) && "Expected '<' to finish parsing a template-id"
) ? void (0) : __assert_fail ("(AssumeTemplateId || Tok.is(tok::less)) && \"Expected '<' to finish parsing a template-id\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2029, __extension__ __PRETTY_FUNCTION__))
2029 "Expected '<' to finish parsing a template-id")(static_cast <bool> ((AssumeTemplateId || Tok.is(tok::less
)) && "Expected '<' to finish parsing a template-id"
) ? void (0) : __assert_fail ("(AssumeTemplateId || Tok.is(tok::less)) && \"Expected '<' to finish parsing a template-id\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2029, __extension__ __PRETTY_FUNCTION__))
;
2030
2031 TemplateTy Template;
2032 TemplateNameKind TNK = TNK_Non_template;
2033 switch (Id.getKind()) {
2034 case UnqualifiedId::IK_Identifier:
2035 case UnqualifiedId::IK_OperatorFunctionId:
2036 case UnqualifiedId::IK_LiteralOperatorId:
2037 if (AssumeTemplateId) {
2038 // We defer the injected-class-name checks until we've found whether
2039 // this template-id is used to form a nested-name-specifier or not.
2040 TNK = Actions.ActOnDependentTemplateName(
2041 getCurScope(), SS, TemplateKWLoc, Id, ObjectType, EnteringContext,
2042 Template, /*AllowInjectedClassName*/ true);
2043 if (TNK == TNK_Non_template)
2044 return true;
2045 } else {
2046 bool MemberOfUnknownSpecialization;
2047 TNK = Actions.isTemplateName(getCurScope(), SS,
2048 TemplateKWLoc.isValid(), Id,
2049 ObjectType, EnteringContext, Template,
2050 MemberOfUnknownSpecialization);
2051
2052 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization &&
2053 ObjectType && IsTemplateArgumentList()) {
2054 // We have something like t->getAs<T>(), where getAs is a
2055 // member of an unknown specialization. However, this will only
2056 // parse correctly as a template, so suggest the keyword 'template'
2057 // before 'getAs' and treat this as a dependent template name.
2058 std::string Name;
2059 if (Id.getKind() == UnqualifiedId::IK_Identifier)
2060 Name = Id.Identifier->getName();
2061 else {
2062 Name = "operator ";
2063 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId)
2064 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator);
2065 else
2066 Name += Id.Identifier->getName();
2067 }
2068 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword)
2069 << Name
2070 << FixItHint::CreateInsertion(Id.StartLocation, "template ");
2071 TNK = Actions.ActOnDependentTemplateName(
2072 getCurScope(), SS, TemplateKWLoc, Id, ObjectType, EnteringContext,
2073 Template, /*AllowInjectedClassName*/ true);
2074 if (TNK == TNK_Non_template)
2075 return true;
2076 }
2077 }
2078 break;
2079
2080 case UnqualifiedId::IK_ConstructorName: {
2081 UnqualifiedId TemplateName;
2082 bool MemberOfUnknownSpecialization;
2083 TemplateName.setIdentifier(Name, NameLoc);
2084 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2085 TemplateName, ObjectType,
2086 EnteringContext, Template,
2087 MemberOfUnknownSpecialization);
2088 break;
2089 }
2090
2091 case UnqualifiedId::IK_DestructorName: {
2092 UnqualifiedId TemplateName;
2093 bool MemberOfUnknownSpecialization;
2094 TemplateName.setIdentifier(Name, NameLoc);
2095 if (ObjectType) {
2096 TNK = Actions.ActOnDependentTemplateName(
2097 getCurScope(), SS, TemplateKWLoc, TemplateName, ObjectType,
2098 EnteringContext, Template, /*AllowInjectedClassName*/ true);
2099 if (TNK == TNK_Non_template)
2100 return true;
2101 } else {
2102 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2103 TemplateName, ObjectType,
2104 EnteringContext, Template,
2105 MemberOfUnknownSpecialization);
2106
2107 if (TNK == TNK_Non_template && !Id.DestructorName.get()) {
2108 Diag(NameLoc, diag::err_destructor_template_id)
2109 << Name << SS.getRange();
2110 return true;
2111 }
2112 }
2113 break;
2114 }
2115
2116 default:
2117 return false;
2118 }
2119
2120 if (TNK == TNK_Non_template)
2121 return false;
2122
2123 // Parse the enclosed template argument list.
2124 SourceLocation LAngleLoc, RAngleLoc;
2125 TemplateArgList TemplateArgs;
2126 if (Tok.is(tok::less) && ParseTemplateIdAfterTemplateName(
2127 true, LAngleLoc, TemplateArgs, RAngleLoc))
2128 return true;
2129
2130 if (Id.getKind() == UnqualifiedId::IK_Identifier ||
2131 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2132 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) {
2133 // Form a parsed representation of the template-id to be stored in the
2134 // UnqualifiedId.
2135
2136 // FIXME: Store name for literal operator too.
2137 IdentifierInfo *TemplateII =
2138 Id.getKind() == UnqualifiedId::IK_Identifier ? Id.Identifier : nullptr;
2139 OverloadedOperatorKind OpKind = Id.getKind() == UnqualifiedId::IK_Identifier
2140 ? OO_None
2141 : Id.OperatorFunctionId.Operator;
2142
2143 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
2144 SS, TemplateKWLoc, Id.StartLocation, TemplateII, OpKind, Template, TNK,
2145 LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
2146
2147 Id.setTemplateId(TemplateId);
2148 return false;
2149 }
2150
2151 // Bundle the template arguments together.
2152 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
2153
2154 // Constructor and destructor names.
2155 TypeResult Type
2156 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
2157 Template, Name, NameLoc,
2158 LAngleLoc, TemplateArgsPtr, RAngleLoc,
2159 /*IsCtorOrDtorName=*/true);
2160 if (Type.isInvalid())
2161 return true;
2162
2163 if (Id.getKind() == UnqualifiedId::IK_ConstructorName)
2164 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc);
2165 else
2166 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc);
2167
2168 return false;
2169}
2170
2171/// \brief Parse an operator-function-id or conversion-function-id as part
2172/// of a C++ unqualified-id.
2173///
2174/// This routine is responsible only for parsing the operator-function-id or
2175/// conversion-function-id; it does not handle template arguments in any way.
2176///
2177/// \code
2178/// operator-function-id: [C++ 13.5]
2179/// 'operator' operator
2180///
2181/// operator: one of
2182/// new delete new[] delete[]
2183/// + - * / % ^ & | ~
2184/// ! = < > += -= *= /= %=
2185/// ^= &= |= << >> >>= <<= == !=
2186/// <= >= && || ++ -- , ->* ->
2187/// () []
2188///
2189/// conversion-function-id: [C++ 12.3.2]
2190/// operator conversion-type-id
2191///
2192/// conversion-type-id:
2193/// type-specifier-seq conversion-declarator[opt]
2194///
2195/// conversion-declarator:
2196/// ptr-operator conversion-declarator[opt]
2197/// \endcode
2198///
2199/// \param SS The nested-name-specifier that preceded this unqualified-id. If
2200/// non-empty, then we are parsing the unqualified-id of a qualified-id.
2201///
2202/// \param EnteringContext whether we are entering the scope of the
2203/// nested-name-specifier.
2204///
2205/// \param ObjectType if this unqualified-id occurs within a member access
2206/// expression, the type of the base object whose member is being accessed.
2207///
2208/// \param Result on a successful parse, contains the parsed unqualified-id.
2209///
2210/// \returns true if parsing fails, false otherwise.
2211bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext,
2212 ParsedType ObjectType,
2213 UnqualifiedId &Result) {
2214 assert(Tok.is(tok::kw_operator) && "Expected 'operator' keyword")(static_cast <bool> (Tok.is(tok::kw_operator) &&
"Expected 'operator' keyword") ? void (0) : __assert_fail ("Tok.is(tok::kw_operator) && \"Expected 'operator' keyword\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2214, __extension__ __PRETTY_FUNCTION__))
;
2215
2216 // Consume the 'operator' keyword.
2217 SourceLocation KeywordLoc = ConsumeToken();
2218
2219 // Determine what kind of operator name we have.
2220 unsigned SymbolIdx = 0;
2221 SourceLocation SymbolLocations[3];
2222 OverloadedOperatorKind Op = OO_None;
2223 switch (Tok.getKind()) {
2224 case tok::kw_new:
2225 case tok::kw_delete: {
2226 bool isNew = Tok.getKind() == tok::kw_new;
2227 // Consume the 'new' or 'delete'.
2228 SymbolLocations[SymbolIdx++] = ConsumeToken();
2229 // Check for array new/delete.
2230 if (Tok.is(tok::l_square) &&
2231 (!getLangOpts().CPlusPlus11 || NextToken().isNot(tok::l_square))) {
2232 // Consume the '[' and ']'.
2233 BalancedDelimiterTracker T(*this, tok::l_square);
2234 T.consumeOpen();
2235 T.consumeClose();
2236 if (T.getCloseLocation().isInvalid())
2237 return true;
2238
2239 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2240 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2241 Op = isNew? OO_Array_New : OO_Array_Delete;
2242 } else {
2243 Op = isNew? OO_New : OO_Delete;
2244 }
2245 break;
2246 }
2247
2248#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
2249 case tok::Token: \
2250 SymbolLocations[SymbolIdx++] = ConsumeToken(); \
2251 Op = OO_##Name; \
2252 break;
2253#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
2254#include "clang/Basic/OperatorKinds.def"
2255
2256 case tok::l_paren: {
2257 // Consume the '(' and ')'.
2258 BalancedDelimiterTracker T(*this, tok::l_paren);
2259 T.consumeOpen();
2260 T.consumeClose();
2261 if (T.getCloseLocation().isInvalid())
2262 return true;
2263
2264 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2265 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2266 Op = OO_Call;
2267 break;
2268 }
2269
2270 case tok::l_square: {
2271 // Consume the '[' and ']'.
2272 BalancedDelimiterTracker T(*this, tok::l_square);
2273 T.consumeOpen();
2274 T.consumeClose();
2275 if (T.getCloseLocation().isInvalid())
2276 return true;
2277
2278 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2279 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2280 Op = OO_Subscript;
2281 break;
2282 }
2283
2284 case tok::code_completion: {
2285 // Code completion for the operator name.
2286 Actions.CodeCompleteOperatorName(getCurScope());
2287 cutOffParsing();
2288 // Don't try to parse any further.
2289 return true;
2290 }
2291
2292 default:
2293 break;
2294 }
2295
2296 if (Op != OO_None) {
2297 // We have parsed an operator-function-id.
2298 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations);
2299 return false;
2300 }
2301
2302 // Parse a literal-operator-id.
2303 //
2304 // literal-operator-id: C++11 [over.literal]
2305 // operator string-literal identifier
2306 // operator user-defined-string-literal
2307
2308 if (getLangOpts().CPlusPlus11 && isTokenStringLiteral()) {
2309 Diag(Tok.getLocation(), diag::warn_cxx98_compat_literal_operator);
2310
2311 SourceLocation DiagLoc;
2312 unsigned DiagId = 0;
2313
2314 // We're past translation phase 6, so perform string literal concatenation
2315 // before checking for "".
2316 SmallVector<Token, 4> Toks;
2317 SmallVector<SourceLocation, 4> TokLocs;
2318 while (isTokenStringLiteral()) {
2319 if (!Tok.is(tok::string_literal) && !DiagId) {
2320 // C++11 [over.literal]p1:
2321 // The string-literal or user-defined-string-literal in a
2322 // literal-operator-id shall have no encoding-prefix [...].
2323 DiagLoc = Tok.getLocation();
2324 DiagId = diag::err_literal_operator_string_prefix;
2325 }
2326 Toks.push_back(Tok);
2327 TokLocs.push_back(ConsumeStringToken());
2328 }
2329
2330 StringLiteralParser Literal(Toks, PP);
2331 if (Literal.hadError)
2332 return true;
2333
2334 // Grab the literal operator's suffix, which will be either the next token
2335 // or a ud-suffix from the string literal.
2336 IdentifierInfo *II = nullptr;
2337 SourceLocation SuffixLoc;
2338 if (!Literal.getUDSuffix().empty()) {
2339 II = &PP.getIdentifierTable().get(Literal.getUDSuffix());
2340 SuffixLoc =
2341 Lexer::AdvanceToTokenCharacter(TokLocs[Literal.getUDSuffixToken()],
2342 Literal.getUDSuffixOffset(),
2343 PP.getSourceManager(), getLangOpts());
2344 } else if (Tok.is(tok::identifier)) {
2345 II = Tok.getIdentifierInfo();
2346 SuffixLoc = ConsumeToken();
2347 TokLocs.push_back(SuffixLoc);
2348 } else {
2349 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
2350 return true;
2351 }
2352
2353 // The string literal must be empty.
2354 if (!Literal.GetString().empty() || Literal.Pascal) {
2355 // C++11 [over.literal]p1:
2356 // The string-literal or user-defined-string-literal in a
2357 // literal-operator-id shall [...] contain no characters
2358 // other than the implicit terminating '\0'.
2359 DiagLoc = TokLocs.front();
2360 DiagId = diag::err_literal_operator_string_not_empty;
2361 }
2362
2363 if (DiagId) {
2364 // This isn't a valid literal-operator-id, but we think we know
2365 // what the user meant. Tell them what they should have written.
2366 SmallString<32> Str;
2367 Str += "\"\"";
2368 Str += II->getName();
2369 Diag(DiagLoc, DiagId) << FixItHint::CreateReplacement(
2370 SourceRange(TokLocs.front(), TokLocs.back()), Str);
2371 }
2372
2373 Result.setLiteralOperatorId(II, KeywordLoc, SuffixLoc);
2374
2375 return Actions.checkLiteralOperatorId(SS, Result);
2376 }
2377
2378 // Parse a conversion-function-id.
2379 //
2380 // conversion-function-id: [C++ 12.3.2]
2381 // operator conversion-type-id
2382 //
2383 // conversion-type-id:
2384 // type-specifier-seq conversion-declarator[opt]
2385 //
2386 // conversion-declarator:
2387 // ptr-operator conversion-declarator[opt]
2388
2389 // Parse the type-specifier-seq.
2390 DeclSpec DS(AttrFactory);
2391 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType?
2392 return true;
2393
2394 // Parse the conversion-declarator, which is merely a sequence of
2395 // ptr-operators.
2396 Declarator D(DS, Declarator::ConversionIdContext);
2397 ParseDeclaratorInternal(D, /*DirectDeclParser=*/nullptr);
2398
2399 // Finish up the type.
2400 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D);
2401 if (Ty.isInvalid())
2402 return true;
2403
2404 // Note that this is a conversion-function-id.
2405 Result.setConversionFunctionId(KeywordLoc, Ty.get(),
2406 D.getSourceRange().getEnd());
2407 return false;
2408}
2409
2410/// \brief Parse a C++ unqualified-id (or a C identifier), which describes the
2411/// name of an entity.
2412///
2413/// \code
2414/// unqualified-id: [C++ expr.prim.general]
2415/// identifier
2416/// operator-function-id
2417/// conversion-function-id
2418/// [C++0x] literal-operator-id [TODO]
2419/// ~ class-name
2420/// template-id
2421///
2422/// \endcode
2423///
2424/// \param SS The nested-name-specifier that preceded this unqualified-id. If
2425/// non-empty, then we are parsing the unqualified-id of a qualified-id.
2426///
2427/// \param EnteringContext whether we are entering the scope of the
2428/// nested-name-specifier.
2429///
2430/// \param AllowDestructorName whether we allow parsing of a destructor name.
2431///
2432/// \param AllowConstructorName whether we allow parsing a constructor name.
2433///
2434/// \param AllowDeductionGuide whether we allow parsing a deduction guide name.
2435///
2436/// \param ObjectType if this unqualified-id occurs within a member access
2437/// expression, the type of the base object whose member is being accessed.
2438///
2439/// \param Result on a successful parse, contains the parsed unqualified-id.
2440///
2441/// \returns true if parsing fails, false otherwise.
2442bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext,
2443 bool AllowDestructorName,
2444 bool AllowConstructorName,
2445 bool AllowDeductionGuide,
2446 ParsedType ObjectType,
2447 SourceLocation& TemplateKWLoc,
2448 UnqualifiedId &Result) {
2449
2450 // Handle 'A::template B'. This is for template-ids which have not
2451 // already been annotated by ParseOptionalCXXScopeSpecifier().
2452 bool TemplateSpecified = false;
2453 if (getLangOpts().CPlusPlus && Tok.is(tok::kw_template) &&
2454 (ObjectType || SS.isSet())) {
2455 TemplateSpecified = true;
2456 TemplateKWLoc = ConsumeToken();
2457 }
2458
2459 // unqualified-id:
2460 // identifier
2461 // template-id (when it hasn't already been annotated)
2462 if (Tok.is(tok::identifier)) {
2463 // Consume the identifier.
2464 IdentifierInfo *Id = Tok.getIdentifierInfo();
2465 SourceLocation IdLoc = ConsumeToken();
2466
2467 if (!getLangOpts().CPlusPlus) {
2468 // If we're not in C++, only identifiers matter. Record the
2469 // identifier and return.
2470 Result.setIdentifier(Id, IdLoc);
2471 return false;
2472 }
2473
2474 ParsedTemplateTy TemplateName;
2475 if (AllowConstructorName &&
2476 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) {
2477 // We have parsed a constructor name.
2478 ParsedType Ty = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, false,
2479 false, nullptr,
2480 /*IsCtorOrDtorName=*/true,
2481 /*NonTrivialTypeSourceInfo=*/true);
2482 Result.setConstructorName(Ty, IdLoc, IdLoc);
2483 } else if (getLangOpts().CPlusPlus1z &&
2484 AllowDeductionGuide && SS.isEmpty() &&
2485 Actions.isDeductionGuideName(getCurScope(), *Id, IdLoc,
2486 &TemplateName)) {
2487 // We have parsed a template-name naming a deduction guide.
2488 Result.setDeductionGuideName(TemplateName, IdLoc);
2489 } else {
2490 // We have parsed an identifier.
2491 Result.setIdentifier(Id, IdLoc);
2492 }
2493
2494 // If the next token is a '<', we may have a template.
2495 if (TemplateSpecified || Tok.is(tok::less))
2496 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, Id, IdLoc,
2497 EnteringContext, ObjectType,
2498 Result, TemplateSpecified);
2499
2500 return false;
2501 }
2502
2503 // unqualified-id:
2504 // template-id (already parsed and annotated)
2505 if (Tok.is(tok::annot_template_id)) {
2506 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2507
2508 // If the template-name names the current class, then this is a constructor
2509 if (AllowConstructorName && TemplateId->Name &&
2510 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) {
2511 if (SS.isSet()) {
2512 // C++ [class.qual]p2 specifies that a qualified template-name
2513 // is taken as the constructor name where a constructor can be
2514 // declared. Thus, the template arguments are extraneous, so
2515 // complain about them and remove them entirely.
2516 Diag(TemplateId->TemplateNameLoc,
2517 diag::err_out_of_line_constructor_template_id)
2518 << TemplateId->Name
2519 << FixItHint::CreateRemoval(
2520 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc));
2521 ParsedType Ty =
2522 Actions.getTypeName(*TemplateId->Name, TemplateId->TemplateNameLoc,
2523 getCurScope(), &SS, false, false, nullptr,
2524 /*IsCtorOrDtorName=*/true,
2525 /*NontrivialTypeSourceInfo=*/true);
2526 Result.setConstructorName(Ty, TemplateId->TemplateNameLoc,
2527 TemplateId->RAngleLoc);
2528 ConsumeAnnotationToken();
2529 return false;
2530 }
2531
2532 Result.setConstructorTemplateId(TemplateId);
2533 ConsumeAnnotationToken();
2534 return false;
2535 }
2536
2537 // We have already parsed a template-id; consume the annotation token as
2538 // our unqualified-id.
2539 Result.setTemplateId(TemplateId);
2540 TemplateKWLoc = TemplateId->TemplateKWLoc;
2541 ConsumeAnnotationToken();
2542 return false;
2543 }
2544
2545 // unqualified-id:
2546 // operator-function-id
2547 // conversion-function-id
2548 if (Tok.is(tok::kw_operator)) {
2549 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result))
2550 return true;
2551
2552 // If we have an operator-function-id or a literal-operator-id and the next
2553 // token is a '<', we may have a
2554 //
2555 // template-id:
2556 // operator-function-id < template-argument-list[opt] >
2557 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2558 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) &&
2559 (TemplateSpecified || Tok.is(tok::less)))
2560 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2561 nullptr, SourceLocation(),
2562 EnteringContext, ObjectType,
2563 Result, TemplateSpecified);
2564
2565 return false;
2566 }
2567
2568 if (getLangOpts().CPlusPlus &&
2569 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) {
2570 // C++ [expr.unary.op]p10:
2571 // There is an ambiguity in the unary-expression ~X(), where X is a
2572 // class-name. The ambiguity is resolved in favor of treating ~ as a
2573 // unary complement rather than treating ~X as referring to a destructor.
2574
2575 // Parse the '~'.
2576 SourceLocation TildeLoc = ConsumeToken();
2577
2578 if (SS.isEmpty() && Tok.is(tok::kw_decltype)) {
2579 DeclSpec DS(AttrFactory);
2580 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
2581 if (ParsedType Type =
2582 Actions.getDestructorTypeForDecltype(DS, ObjectType)) {
2583 Result.setDestructorName(TildeLoc, Type, EndLoc);
2584 return false;
2585 }
2586 return true;
2587 }
2588
2589 // Parse the class-name.
2590 if (Tok.isNot(tok::identifier)) {
2591 Diag(Tok, diag::err_destructor_tilde_identifier);
2592 return true;
2593 }
2594
2595 // If the user wrote ~T::T, correct it to T::~T.
2596 DeclaratorScopeObj DeclScopeObj(*this, SS);
2597 if (!TemplateSpecified && NextToken().is(tok::coloncolon)) {
2598 // Don't let ParseOptionalCXXScopeSpecifier() "correct"
2599 // `int A; struct { ~A::A(); };` to `int A; struct { ~A:A(); };`,
2600 // it will confuse this recovery logic.
2601 ColonProtectionRAIIObject ColonRAII(*this, false);
2602
2603 if (SS.isSet()) {
2604 AnnotateScopeToken(SS, /*NewAnnotation*/true);
2605 SS.clear();
2606 }
2607 if (ParseOptionalCXXScopeSpecifier(SS, ObjectType, EnteringContext))
2608 return true;
2609 if (SS.isNotEmpty())
2610 ObjectType = nullptr;
2611 if (Tok.isNot(tok::identifier) || NextToken().is(tok::coloncolon) ||
2612 !SS.isSet()) {
2613 Diag(TildeLoc, diag::err_destructor_tilde_scope);
2614 return true;
2615 }
2616
2617 // Recover as if the tilde had been written before the identifier.
2618 Diag(TildeLoc, diag::err_destructor_tilde_scope)
2619 << FixItHint::CreateRemoval(TildeLoc)
2620 << FixItHint::CreateInsertion(Tok.getLocation(), "~");
2621
2622 // Temporarily enter the scope for the rest of this function.
2623 if (Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
2624 DeclScopeObj.EnterDeclaratorScope();
2625 }
2626
2627 // Parse the class-name (or template-name in a simple-template-id).
2628 IdentifierInfo *ClassName = Tok.getIdentifierInfo();
2629 SourceLocation ClassNameLoc = ConsumeToken();
2630
2631 if (TemplateSpecified || Tok.is(tok::less)) {
2632 Result.setDestructorName(TildeLoc, nullptr, ClassNameLoc);
2633 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2634 ClassName, ClassNameLoc,
2635 EnteringContext, ObjectType,
2636 Result, TemplateSpecified);
2637 }
2638
2639 // Note that this is a destructor name.
2640 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName,
2641 ClassNameLoc, getCurScope(),
2642 SS, ObjectType,
2643 EnteringContext);
2644 if (!Ty)
2645 return true;
2646
2647 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc);
2648 return false;
2649 }
2650
2651 Diag(Tok, diag::err_expected_unqualified_id)
2652 << getLangOpts().CPlusPlus;
2653 return true;
2654}
2655
2656/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate
2657/// memory in a typesafe manner and call constructors.
2658///
2659/// This method is called to parse the new expression after the optional :: has
2660/// been already parsed. If the :: was present, "UseGlobal" is true and "Start"
2661/// is its location. Otherwise, "Start" is the location of the 'new' token.
2662///
2663/// new-expression:
2664/// '::'[opt] 'new' new-placement[opt] new-type-id
2665/// new-initializer[opt]
2666/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2667/// new-initializer[opt]
2668///
2669/// new-placement:
2670/// '(' expression-list ')'
2671///
2672/// new-type-id:
2673/// type-specifier-seq new-declarator[opt]
2674/// [GNU] attributes type-specifier-seq new-declarator[opt]
2675///
2676/// new-declarator:
2677/// ptr-operator new-declarator[opt]
2678/// direct-new-declarator
2679///
2680/// new-initializer:
2681/// '(' expression-list[opt] ')'
2682/// [C++0x] braced-init-list
2683///
2684ExprResult
2685Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) {
2686 assert(Tok.is(tok::kw_new) && "expected 'new' token")(static_cast <bool> (Tok.is(tok::kw_new) && "expected 'new' token"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_new) && \"expected 'new' token\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2686, __extension__ __PRETTY_FUNCTION__))
;
2687 ConsumeToken(); // Consume 'new'
2688
2689 // A '(' now can be a new-placement or the '(' wrapping the type-id in the
2690 // second form of new-expression. It can't be a new-type-id.
2691
2692 ExprVector PlacementArgs;
2693 SourceLocation PlacementLParen, PlacementRParen;
2694
2695 SourceRange TypeIdParens;
2696 DeclSpec DS(AttrFactory);
2697 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext);
2698 if (Tok.is(tok::l_paren)) {
2699 // If it turns out to be a placement, we change the type location.
2700 BalancedDelimiterTracker T(*this, tok::l_paren);
2701 T.consumeOpen();
2702 PlacementLParen = T.getOpenLocation();
2703 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) {
2704 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2705 return ExprError();
2706 }
2707
2708 T.consumeClose();
2709 PlacementRParen = T.getCloseLocation();
2710 if (PlacementRParen.isInvalid()) {
2711 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2712 return ExprError();
2713 }
2714
2715 if (PlacementArgs.empty()) {
2716 // Reset the placement locations. There was no placement.
2717 TypeIdParens = T.getRange();
2718 PlacementLParen = PlacementRParen = SourceLocation();
2719 } else {
2720 // We still need the type.
2721 if (Tok.is(tok::l_paren)) {
2722 BalancedDelimiterTracker T(*this, tok::l_paren);
2723 T.consumeOpen();
2724 MaybeParseGNUAttributes(DeclaratorInfo);
2725 ParseSpecifierQualifierList(DS);
2726 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2727 ParseDeclarator(DeclaratorInfo);
2728 T.consumeClose();
2729 TypeIdParens = T.getRange();
2730 } else {
2731 MaybeParseGNUAttributes(DeclaratorInfo);
2732 if (ParseCXXTypeSpecifierSeq(DS))
2733 DeclaratorInfo.setInvalidType(true);
2734 else {
2735 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2736 ParseDeclaratorInternal(DeclaratorInfo,
2737 &Parser::ParseDirectNewDeclarator);
2738 }
2739 }
2740 }
2741 } else {
2742 // A new-type-id is a simplified type-id, where essentially the
2743 // direct-declarator is replaced by a direct-new-declarator.
2744 MaybeParseGNUAttributes(DeclaratorInfo);
2745 if (ParseCXXTypeSpecifierSeq(DS))
2746 DeclaratorInfo.setInvalidType(true);
2747 else {
2748 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2749 ParseDeclaratorInternal(DeclaratorInfo,
2750 &Parser::ParseDirectNewDeclarator);
2751 }
2752 }
2753 if (DeclaratorInfo.isInvalidType()) {
2754 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2755 return ExprError();
2756 }
2757
2758 ExprResult Initializer;
2759
2760 if (Tok.is(tok::l_paren)) {
2761 SourceLocation ConstructorLParen, ConstructorRParen;
2762 ExprVector ConstructorArgs;
2763 BalancedDelimiterTracker T(*this, tok::l_paren);
2764 T.consumeOpen();
2765 ConstructorLParen = T.getOpenLocation();
2766 if (Tok.isNot(tok::r_paren)) {
2767 CommaLocsTy CommaLocs;
2768 if (ParseExpressionList(ConstructorArgs, CommaLocs, [&] {
2769 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(),
2770 DeclaratorInfo).get();
2771 Actions.CodeCompleteConstructor(getCurScope(),
2772 TypeRep.get()->getCanonicalTypeInternal(),
2773 DeclaratorInfo.getLocEnd(),
2774 ConstructorArgs);
2775 })) {
2776 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2777 return ExprError();
2778 }
2779 }
2780 T.consumeClose();
2781 ConstructorRParen = T.getCloseLocation();
2782 if (ConstructorRParen.isInvalid()) {
2783 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2784 return ExprError();
2785 }
2786 Initializer = Actions.ActOnParenListExpr(ConstructorLParen,
2787 ConstructorRParen,
2788 ConstructorArgs);
2789 } else if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus11) {
2790 Diag(Tok.getLocation(),
2791 diag::warn_cxx98_compat_generalized_initializer_lists);
2792 Initializer = ParseBraceInitializer();
2793 }
2794 if (Initializer.isInvalid())
2795 return Initializer;
2796
2797 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen,
2798 PlacementArgs, PlacementRParen,
2799 TypeIdParens, DeclaratorInfo, Initializer.get());
2800}
2801
2802/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be
2803/// passed to ParseDeclaratorInternal.
2804///
2805/// direct-new-declarator:
2806/// '[' expression ']'
2807/// direct-new-declarator '[' constant-expression ']'
2808///
2809void Parser::ParseDirectNewDeclarator(Declarator &D) {
2810 // Parse the array dimensions.
2811 bool first = true;
2812 while (Tok.is(tok::l_square)) {
2813 // An array-size expression can't start with a lambda.
2814 if (CheckProhibitedCXX11Attribute())
2815 continue;
2816
2817 BalancedDelimiterTracker T(*this, tok::l_square);
2818 T.consumeOpen();
2819
2820 ExprResult Size(first ? ParseExpression()
2821 : ParseConstantExpression());
2822 if (Size.isInvalid()) {
2823 // Recover
2824 SkipUntil(tok::r_square, StopAtSemi);
2825 return;
2826 }
2827 first = false;
2828
2829 T.consumeClose();
2830
2831 // Attributes here appertain to the array type. C++11 [expr.new]p5.
2832 ParsedAttributes Attrs(AttrFactory);
2833 MaybeParseCXX11Attributes(Attrs);
2834
2835 D.AddTypeInfo(DeclaratorChunk::getArray(0,
2836 /*static=*/false, /*star=*/false,
2837 Size.get(),
2838 T.getOpenLocation(),
2839 T.getCloseLocation()),
2840 Attrs, T.getCloseLocation());
2841
2842 if (T.getCloseLocation().isInvalid())
2843 return;
2844 }
2845}
2846
2847/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id.
2848/// This ambiguity appears in the syntax of the C++ new operator.
2849///
2850/// new-expression:
2851/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2852/// new-initializer[opt]
2853///
2854/// new-placement:
2855/// '(' expression-list ')'
2856///
2857bool Parser::ParseExpressionListOrTypeId(
2858 SmallVectorImpl<Expr*> &PlacementArgs,
2859 Declarator &D) {
2860 // The '(' was already consumed.
2861 if (isTypeIdInParens()) {
2862 ParseSpecifierQualifierList(D.getMutableDeclSpec());
2863 D.SetSourceRange(D.getDeclSpec().getSourceRange());
2864 ParseDeclarator(D);
2865 return D.isInvalidType();
2866 }
2867
2868 // It's not a type, it has to be an expression list.
2869 // Discard the comma locations - ActOnCXXNew has enough parameters.
2870 CommaLocsTy CommaLocs;
2871 return ParseExpressionList(PlacementArgs, CommaLocs);
2872}
2873
2874/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used
2875/// to free memory allocated by new.
2876///
2877/// This method is called to parse the 'delete' expression after the optional
2878/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true
2879/// and "Start" is its location. Otherwise, "Start" is the location of the
2880/// 'delete' token.
2881///
2882/// delete-expression:
2883/// '::'[opt] 'delete' cast-expression
2884/// '::'[opt] 'delete' '[' ']' cast-expression
2885ExprResult
2886Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) {
2887 assert(Tok.is(tok::kw_delete) && "Expected 'delete' keyword")(static_cast <bool> (Tok.is(tok::kw_delete) && "Expected 'delete' keyword"
) ? void (0) : __assert_fail ("Tok.is(tok::kw_delete) && \"Expected 'delete' keyword\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2887, __extension__ __PRETTY_FUNCTION__))
;
2888 ConsumeToken(); // Consume 'delete'
2889
2890 // Array delete?
2891 bool ArrayDelete = false;
2892 if (Tok.is(tok::l_square) && NextToken().is(tok::r_square)) {
2893 // C++11 [expr.delete]p1:
2894 // Whenever the delete keyword is followed by empty square brackets, it
2895 // shall be interpreted as [array delete].
2896 // [Footnote: A lambda expression with a lambda-introducer that consists
2897 // of empty square brackets can follow the delete keyword if
2898 // the lambda expression is enclosed in parentheses.]
2899 // FIXME: Produce a better diagnostic if the '[]' is unambiguously a
2900 // lambda-introducer.
2901 ArrayDelete = true;
2902 BalancedDelimiterTracker T(*this, tok::l_square);
2903
2904 T.consumeOpen();
2905 T.consumeClose();
2906 if (T.getCloseLocation().isInvalid())
2907 return ExprError();
2908 }
2909
2910 ExprResult Operand(ParseCastExpression(false));
2911 if (Operand.isInvalid())
2912 return Operand;
2913
2914 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.get());
2915}
2916
2917static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) {
2918 switch (kind) {
2919 default: llvm_unreachable("Not a known type trait")::llvm::llvm_unreachable_internal("Not a known type trait", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2919)
;
2920#define TYPE_TRAIT_1(Spelling, Name, Key) \
2921case tok::kw_ ## Spelling: return UTT_ ## Name;
2922#define TYPE_TRAIT_2(Spelling, Name, Key) \
2923case tok::kw_ ## Spelling: return BTT_ ## Name;
2924#include "clang/Basic/TokenKinds.def"
2925#define TYPE_TRAIT_N(Spelling, Name, Key) \
2926 case tok::kw_ ## Spelling: return TT_ ## Name;
2927#include "clang/Basic/TokenKinds.def"
2928 }
2929}
2930
2931static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) {
2932 switch(kind) {
2933 default: llvm_unreachable("Not a known binary type trait")::llvm::llvm_unreachable_internal("Not a known binary type trait"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2933)
;
2934 case tok::kw___array_rank: return ATT_ArrayRank;
2935 case tok::kw___array_extent: return ATT_ArrayExtent;
2936 }
2937}
2938
2939static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) {
2940 switch(kind) {
2941 default: llvm_unreachable("Not a known unary expression trait.")::llvm::llvm_unreachable_internal("Not a known unary expression trait."
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2941)
;
2942 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr;
2943 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr;
2944 }
2945}
2946
2947static unsigned TypeTraitArity(tok::TokenKind kind) {
2948 switch (kind) {
2949 default: llvm_unreachable("Not a known type trait")::llvm::llvm_unreachable_internal("Not a known type trait", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2949)
;
2950#define TYPE_TRAIT(N,Spelling,K) case tok::kw_##Spelling: return N;
2951#include "clang/Basic/TokenKinds.def"
2952 }
2953}
2954
2955/// \brief Parse the built-in type-trait pseudo-functions that allow
2956/// implementation of the TR1/C++11 type traits templates.
2957///
2958/// primary-expression:
2959/// unary-type-trait '(' type-id ')'
2960/// binary-type-trait '(' type-id ',' type-id ')'
2961/// type-trait '(' type-id-seq ')'
2962///
2963/// type-id-seq:
2964/// type-id ...[opt] type-id-seq[opt]
2965///
2966ExprResult Parser::ParseTypeTrait() {
2967 tok::TokenKind Kind = Tok.getKind();
2968 unsigned Arity = TypeTraitArity(Kind);
2969
2970 SourceLocation Loc = ConsumeToken();
2971
2972 BalancedDelimiterTracker Parens(*this, tok::l_paren);
2973 if (Parens.expectAndConsume())
2974 return ExprError();
2975
2976 SmallVector<ParsedType, 2> Args;
2977 do {
2978 // Parse the next type.
2979 TypeResult Ty = ParseTypeName();
2980 if (Ty.isInvalid()) {
2981 Parens.skipToEnd();
2982 return ExprError();
2983 }
2984
2985 // Parse the ellipsis, if present.
2986 if (Tok.is(tok::ellipsis)) {
2987 Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken());
2988 if (Ty.isInvalid()) {
2989 Parens.skipToEnd();
2990 return ExprError();
2991 }
2992 }
2993
2994 // Add this type to the list of arguments.
2995 Args.push_back(Ty.get());
2996 } while (TryConsumeToken(tok::comma));
2997
2998 if (Parens.consumeClose())
2999 return ExprError();
3000
3001 SourceLocation EndLoc = Parens.getCloseLocation();
3002
3003 if (Arity && Args.size() != Arity) {
3004 Diag(EndLoc, diag::err_type_trait_arity)
3005 << Arity << 0 << (Arity > 1) << (int)Args.size() << SourceRange(Loc);
3006 return ExprError();
3007 }
3008
3009 if (!Arity && Args.empty()) {
3010 Diag(EndLoc, diag::err_type_trait_arity)
3011 << 1 << 1 << 1 << (int)Args.size() << SourceRange(Loc);
3012 return ExprError();
3013 }
3014
3015 return Actions.ActOnTypeTrait(TypeTraitFromTokKind(Kind), Loc, Args, EndLoc);
3016}
3017
3018/// ParseArrayTypeTrait - Parse the built-in array type-trait
3019/// pseudo-functions.
3020///
3021/// primary-expression:
3022/// [Embarcadero] '__array_rank' '(' type-id ')'
3023/// [Embarcadero] '__array_extent' '(' type-id ',' expression ')'
3024///
3025ExprResult Parser::ParseArrayTypeTrait() {
3026 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind());
3027 SourceLocation Loc = ConsumeToken();
3028
3029 BalancedDelimiterTracker T(*this, tok::l_paren);
3030 if (T.expectAndConsume())
3031 return ExprError();
3032
3033 TypeResult Ty = ParseTypeName();
3034 if (Ty.isInvalid()) {
3035 SkipUntil(tok::comma, StopAtSemi);
3036 SkipUntil(tok::r_paren, StopAtSemi);
3037 return ExprError();
3038 }
3039
3040 switch (ATT) {
3041 case ATT_ArrayRank: {
3042 T.consumeClose();
3043 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), nullptr,
3044 T.getCloseLocation());
3045 }
3046 case ATT_ArrayExtent: {
3047 if (ExpectAndConsume(tok::comma)) {
3048 SkipUntil(tok::r_paren, StopAtSemi);
3049 return ExprError();
3050 }
3051
3052 ExprResult DimExpr = ParseExpression();
3053 T.consumeClose();
3054
3055 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(),
3056 T.getCloseLocation());
3057 }
3058 }
3059 llvm_unreachable("Invalid ArrayTypeTrait!")::llvm::llvm_unreachable_internal("Invalid ArrayTypeTrait!", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3059)
;
3060}
3061
3062/// ParseExpressionTrait - Parse built-in expression-trait
3063/// pseudo-functions like __is_lvalue_expr( xxx ).
3064///
3065/// primary-expression:
3066/// [Embarcadero] expression-trait '(' expression ')'
3067///
3068ExprResult Parser::ParseExpressionTrait() {
3069 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind());
3070 SourceLocation Loc = ConsumeToken();
3071
3072 BalancedDelimiterTracker T(*this, tok::l_paren);
3073 if (T.expectAndConsume())
3074 return ExprError();
3075
3076 ExprResult Expr = ParseExpression();
3077
3078 T.consumeClose();
3079
3080 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(),
3081 T.getCloseLocation());
3082}
3083
3084
3085/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
3086/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
3087/// based on the context past the parens.
3088ExprResult
3089Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType,
3090 ParsedType &CastTy,
3091 BalancedDelimiterTracker &Tracker,
3092 ColonProtectionRAIIObject &ColonProt) {
3093 assert(getLangOpts().CPlusPlus && "Should only be called for C++!")(static_cast <bool> (getLangOpts().CPlusPlus &&
"Should only be called for C++!") ? void (0) : __assert_fail
("getLangOpts().CPlusPlus && \"Should only be called for C++!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3093, __extension__ __PRETTY_FUNCTION__))
;
3094 assert(ExprType == CastExpr && "Compound literals are not ambiguous!")(static_cast <bool> (ExprType == CastExpr && "Compound literals are not ambiguous!"
) ? void (0) : __assert_fail ("ExprType == CastExpr && \"Compound literals are not ambiguous!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3094, __extension__ __PRETTY_FUNCTION__))
;
3095 assert(isTypeIdInParens() && "Not a type-id!")(static_cast <bool> (isTypeIdInParens() && "Not a type-id!"
) ? void (0) : __assert_fail ("isTypeIdInParens() && \"Not a type-id!\""
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3095, __extension__ __PRETTY_FUNCTION__))
;
3096
3097 ExprResult Result(true);
3098 CastTy = nullptr;
3099
3100 // We need to disambiguate a very ugly part of the C++ syntax:
3101 //
3102 // (T())x; - type-id
3103 // (T())*x; - type-id
3104 // (T())/x; - expression
3105 // (T()); - expression
3106 //
3107 // The bad news is that we cannot use the specialized tentative parser, since
3108 // it can only verify that the thing inside the parens can be parsed as
3109 // type-id, it is not useful for determining the context past the parens.
3110 //
3111 // The good news is that the parser can disambiguate this part without
3112 // making any unnecessary Action calls.
3113 //
3114 // It uses a scheme similar to parsing inline methods. The parenthesized
3115 // tokens are cached, the context that follows is determined (possibly by
3116 // parsing a cast-expression), and then we re-introduce the cached tokens
3117 // into the token stream and parse them appropriately.
3118
3119 ParenParseOption ParseAs;
3120 CachedTokens Toks;
3121
3122 // Store the tokens of the parentheses. We will parse them after we determine
3123 // the context that follows them.
3124 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) {
3125 // We didn't find the ')' we expected.
3126 Tracker.consumeClose();
3127 return ExprError();
3128 }
3129
3130 if (Tok.is(tok::l_brace)) {
3131 ParseAs = CompoundLiteral;
3132 } else {
3133 bool NotCastExpr;
3134 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) {
3135 NotCastExpr = true;
3136 } else {
3137 // Try parsing the cast-expression that may follow.
3138 // If it is not a cast-expression, NotCastExpr will be true and no token
3139 // will be consumed.
3140 ColonProt.restore();
3141 Result = ParseCastExpression(false/*isUnaryExpression*/,
3142 false/*isAddressofOperand*/,
3143 NotCastExpr,
3144 // type-id has priority.
3145 IsTypeCast);
3146 }
3147
3148 // If we parsed a cast-expression, it's really a type-id, otherwise it's
3149 // an expression.
3150 ParseAs = NotCastExpr ? SimpleExpr : CastExpr;
3151 }
3152
3153 // Create a fake EOF to mark end of Toks buffer.
3154 Token AttrEnd;
3155 AttrEnd.startToken();
3156 AttrEnd.setKind(tok::eof);
3157 AttrEnd.setLocation(Tok.getLocation());
3158 AttrEnd.setEofData(Toks.data());
3159 Toks.push_back(AttrEnd);
3160
3161 // The current token should go after the cached tokens.
3162 Toks.push_back(Tok);
3163 // Re-enter the stored parenthesized tokens into the token stream, so we may
3164 // parse them now.
3165 PP.EnterTokenStream(Toks, true /*DisableMacroExpansion*/);
3166 // Drop the current token and bring the first cached one. It's the same token
3167 // as when we entered this function.
3168 ConsumeAnyToken();
3169
3170 if (ParseAs >= CompoundLiteral) {
3171 // Parse the type declarator.
3172 DeclSpec DS(AttrFactory);
3173 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
3174 {
3175 ColonProtectionRAIIObject InnerColonProtection(*this);
3176 ParseSpecifierQualifierList(DS);
3177 ParseDeclarator(DeclaratorInfo);
3178 }
3179
3180 // Match the ')'.
3181 Tracker.consumeClose();
3182 ColonProt.restore();
3183
3184 // Consume EOF marker for Toks buffer.
3185 assert(Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData())(static_cast <bool> (Tok.is(tok::eof) && Tok.getEofData
() == AttrEnd.getEofData()) ? void (0) : __assert_fail ("Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData()"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3185, __extension__ __PRETTY_FUNCTION__))
;
3186 ConsumeAnyToken();
3187
3188 if (ParseAs == CompoundLiteral) {
3189 ExprType = CompoundLiteral;
3190 if (DeclaratorInfo.isInvalidType())
3191 return ExprError();
3192
3193 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
3194 return ParseCompoundLiteralExpression(Ty.get(),
3195 Tracker.getOpenLocation(),
3196 Tracker.getCloseLocation());
3197 }
3198
3199 // We parsed '(' type-id ')' and the thing after it wasn't a '{'.
3200 assert(ParseAs == CastExpr)(static_cast <bool> (ParseAs == CastExpr) ? void (0) : __assert_fail
("ParseAs == CastExpr", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3200, __extension__ __PRETTY_FUNCTION__))
;
3201
3202 if (DeclaratorInfo.isInvalidType())
3203 return ExprError();
3204
3205 // Result is what ParseCastExpression returned earlier.
3206 if (!Result.isInvalid())
3207 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(),
3208 DeclaratorInfo, CastTy,
3209 Tracker.getCloseLocation(), Result.get());
3210 return Result;
3211 }
3212
3213 // Not a compound literal, and not followed by a cast-expression.
3214 assert(ParseAs == SimpleExpr)(static_cast <bool> (ParseAs == SimpleExpr) ? void (0) :
__assert_fail ("ParseAs == SimpleExpr", "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3214, __extension__ __PRETTY_FUNCTION__))
;
3215
3216 ExprType = SimpleExpr;
3217 Result = ParseExpression();
3218 if (!Result.isInvalid() && Tok.is(tok::r_paren))
3219 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(),
3220 Tok.getLocation(), Result.get());
3221
3222 // Match the ')'.
3223 if (Result.isInvalid()) {
3224 while (Tok.isNot(tok::eof))
3225 ConsumeAnyToken();
3226 assert(Tok.getEofData() == AttrEnd.getEofData())(static_cast <bool> (Tok.getEofData() == AttrEnd.getEofData
()) ? void (0) : __assert_fail ("Tok.getEofData() == AttrEnd.getEofData()"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3226, __extension__ __PRETTY_FUNCTION__))
;
3227 ConsumeAnyToken();
3228 return ExprError();
3229 }
3230
3231 Tracker.consumeClose();
3232 // Consume EOF marker for Toks buffer.
3233 assert(Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData())(static_cast <bool> (Tok.is(tok::eof) && Tok.getEofData
() == AttrEnd.getEofData()) ? void (0) : __assert_fail ("Tok.is(tok::eof) && Tok.getEofData() == AttrEnd.getEofData()"
, "/build/llvm-toolchain-snapshot-6.0~svn318601/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3233, __extension__ __PRETTY_FUNCTION__))
;
3234 ConsumeAnyToken();
3235 return Result;
3236}