Bug Summary

File:tools/clang/lib/Parse/ParseExprCXX.cpp
Warning:line 1772, column 5
Called C++ object pointer is null

Annotated Source Code

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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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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().CPlusPlus17
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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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~svn321499/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/// [Clang] type-specifier-seq ref-qualifier[opt] '[' identifier-list ']'
1719/// brace-or-equal-initializer
1720/// [GNU] type-specifier-seq declarator simple-asm-expr[opt] attributes[opt]
1721/// '=' assignment-expression
1722///
1723/// In C++1z, a condition may in some contexts be preceded by an
1724/// optional init-statement. This function will parse that too.
1725///
1726/// \param InitStmt If non-null, an init-statement is permitted, and if present
1727/// will be parsed and stored here.
1728///
1729/// \param Loc The location of the start of the statement that requires this
1730/// condition, e.g., the "for" in a for loop.
1731///
1732/// \returns The parsed condition.
1733Sema::ConditionResult Parser::ParseCXXCondition(StmtResult *InitStmt,
1734 SourceLocation Loc,
1735 Sema::ConditionKind CK) {
1736 if (Tok.is(tok::code_completion)) {
1
Taking false branch
→
8
←
Taking false branch
→
1737 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Condition);
1738 cutOffParsing();
1739 return Sema::ConditionError();
1740 }
1741
1742 ParsedAttributesWithRange attrs(AttrFactory);
1743 MaybeParseCXX11Attributes(attrs);
1744
1745 // Determine what kind of thing we have.
1746 switch (isCXXConditionDeclarationOrInitStatement(InitStmt)) {
2
←
Control jumps to 'case InitStmtDecl:' at line 1764
→
9
←
Control jumps to 'case InitStmtDecl:' at line 1764
→
1747 case ConditionOrInitStatement::Expression: {
1748 ProhibitAttributes(attrs);
1749
1750 // Parse the expression.
1751 ExprResult Expr = ParseExpression(); // expression
1752 if (Expr.isInvalid())
1753 return Sema::ConditionError();
1754
1755 if (InitStmt && Tok.is(tok::semi)) {
1756 *InitStmt = Actions.ActOnExprStmt(Expr.get());
1757 ConsumeToken();
1758 return ParseCXXCondition(nullptr, Loc, CK);
1759 }
1760
1761 return Actions.ActOnCondition(getCurScope(), Loc, Expr.get(), CK);
1762 }
1763
1764 case ConditionOrInitStatement::InitStmtDecl: {
1765 Diag(Tok.getLocation(), getLangOpts().CPlusPlus17
3
←
Assuming the condition is false
→
4
←
'?' condition is false
→
10
←
Assuming the condition is false
→
11
←
'?' condition is false
→
1766 ? diag::warn_cxx14_compat_init_statement
1767 : diag::ext_init_statement)
1768 << (CK == Sema::ConditionKind::Switch);
5
←
Assuming 'CK' is equal to Switch
→
1769 SourceLocation DeclStart = Tok.getLocation(), DeclEnd;
1770 DeclGroupPtrTy DG = ParseSimpleDeclaration(
1771 Declarator::InitStmtContext, DeclEnd, attrs, /*RequireSemi=*/true);
1772 *InitStmt = Actions.ActOnDeclStmt(DG, DeclStart, DeclEnd);
12
←
Called C++ object pointer is null
1773 return ParseCXXCondition(nullptr, Loc, CK);
6
←
Passing null pointer value via 1st parameter 'InitStmt'
→
7
←
Calling 'Parser::ParseCXXCondition'
→
1774 }
1775
1776 case ConditionOrInitStatement::ConditionDecl:
1777 case ConditionOrInitStatement::Error:
1778 break;
1779 }
1780
1781 // type-specifier-seq
1782 DeclSpec DS(AttrFactory);
1783 DS.takeAttributesFrom(attrs);
1784 ParseSpecifierQualifierList(DS, AS_none, DSC_condition);
1785
1786 // declarator
1787 Declarator DeclaratorInfo(DS, Declarator::ConditionContext);
1788 ParseDeclarator(DeclaratorInfo);
1789
1790 // simple-asm-expr[opt]
1791 if (Tok.is(tok::kw_asm)) {
1792 SourceLocation Loc;
1793 ExprResult AsmLabel(ParseSimpleAsm(&Loc));
1794 if (AsmLabel.isInvalid()) {
1795 SkipUntil(tok::semi, StopAtSemi);
1796 return Sema::ConditionError();
1797 }
1798 DeclaratorInfo.setAsmLabel(AsmLabel.get());
1799 DeclaratorInfo.SetRangeEnd(Loc);
1800 }
1801
1802 // If attributes are present, parse them.
1803 MaybeParseGNUAttributes(DeclaratorInfo);
1804
1805 // Type-check the declaration itself.
1806 DeclResult Dcl = Actions.ActOnCXXConditionDeclaration(getCurScope(),
1807 DeclaratorInfo);
1808 if (Dcl.isInvalid())
1809 return Sema::ConditionError();
1810 Decl *DeclOut = Dcl.get();
1811
1812 // '=' assignment-expression
1813 // If a '==' or '+=' is found, suggest a fixit to '='.
1814 bool CopyInitialization = isTokenEqualOrEqualTypo();
1815 if (CopyInitialization)
1816 ConsumeToken();
1817
1818 ExprResult InitExpr = ExprError();
1819 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1820 Diag(Tok.getLocation(),
1821 diag::warn_cxx98_compat_generalized_initializer_lists);
1822 InitExpr = ParseBraceInitializer();
1823 } else if (CopyInitialization) {
1824 InitExpr = ParseAssignmentExpression();
1825 } else if (Tok.is(tok::l_paren)) {
1826 // This was probably an attempt to initialize the variable.
1827 SourceLocation LParen = ConsumeParen(), RParen = LParen;
1828 if (SkipUntil(tok::r_paren, StopAtSemi | StopBeforeMatch))
1829 RParen = ConsumeParen();
1830 Diag(DeclOut->getLocation(),
1831 diag::err_expected_init_in_condition_lparen)
1832 << SourceRange(LParen, RParen);
1833 } else {
1834 Diag(DeclOut->getLocation(), diag::err_expected_init_in_condition);
1835 }
1836
1837 if (!InitExpr.isInvalid())
1838 Actions.AddInitializerToDecl(DeclOut, InitExpr.get(), !CopyInitialization);
1839 else
1840 Actions.ActOnInitializerError(DeclOut);
1841
1842 Actions.FinalizeDeclaration(DeclOut);
1843 return Actions.ActOnConditionVariable(DeclOut, Loc, CK);
1844}
1845
1846/// ParseCXXSimpleTypeSpecifier - [C++ 7.1.5.2] Simple type specifiers.
1847/// This should only be called when the current token is known to be part of
1848/// simple-type-specifier.
1849///
1850/// simple-type-specifier:
1851/// '::'[opt] nested-name-specifier[opt] type-name
1852/// '::'[opt] nested-name-specifier 'template' simple-template-id [TODO]
1853/// char
1854/// wchar_t
1855/// bool
1856/// short
1857/// int
1858/// long
1859/// signed
1860/// unsigned
1861/// float
1862/// double
1863/// void
1864/// [GNU] typeof-specifier
1865/// [C++0x] auto [TODO]
1866///
1867/// type-name:
1868/// class-name
1869/// enum-name
1870/// typedef-name
1871///
1872void Parser::ParseCXXSimpleTypeSpecifier(DeclSpec &DS) {
1873 DS.SetRangeStart(Tok.getLocation());
1874 const char *PrevSpec;
1875 unsigned DiagID;
1876 SourceLocation Loc = Tok.getLocation();
1877 const clang::PrintingPolicy &Policy =
1878 Actions.getASTContext().getPrintingPolicy();
1879
1880 switch (Tok.getKind()) {
1881 case tok::identifier: // foo::bar
1882 case tok::coloncolon: // ::foo::bar
1883 llvm_unreachable("Annotation token should already be formed!")::llvm::llvm_unreachable_internal("Annotation token should already be formed!"
, "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1883);
1884 default:
1885 llvm_unreachable("Not a simple-type-specifier token!")::llvm::llvm_unreachable_internal("Not a simple-type-specifier token!"
, "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 1885);
1886
1887 // type-name
1888 case tok::annot_typename: {
1889 if (getTypeAnnotation(Tok))
1890 DS.SetTypeSpecType(DeclSpec::TST_typename, Loc, PrevSpec, DiagID,
1891 getTypeAnnotation(Tok), Policy);
1892 else
1893 DS.SetTypeSpecError();
1894
1895 DS.SetRangeEnd(Tok.getAnnotationEndLoc());
1896 ConsumeAnnotationToken();
1897
1898 DS.Finish(Actions, Policy);
1899 return;
1900 }
1901
1902 // builtin types
1903 case tok::kw_short:
1904 DS.SetTypeSpecWidth(DeclSpec::TSW_short, Loc, PrevSpec, DiagID, Policy);
1905 break;
1906 case tok::kw_long:
1907 DS.SetTypeSpecWidth(DeclSpec::TSW_long, Loc, PrevSpec, DiagID, Policy);
1908 break;
1909 case tok::kw___int64:
1910 DS.SetTypeSpecWidth(DeclSpec::TSW_longlong, Loc, PrevSpec, DiagID, Policy);
1911 break;
1912 case tok::kw_signed:
1913 DS.SetTypeSpecSign(DeclSpec::TSS_signed, Loc, PrevSpec, DiagID);
1914 break;
1915 case tok::kw_unsigned:
1916 DS.SetTypeSpecSign(DeclSpec::TSS_unsigned, Loc, PrevSpec, DiagID);
1917 break;
1918 case tok::kw_void:
1919 DS.SetTypeSpecType(DeclSpec::TST_void, Loc, PrevSpec, DiagID, Policy);
1920 break;
1921 case tok::kw_char:
1922 DS.SetTypeSpecType(DeclSpec::TST_char, Loc, PrevSpec, DiagID, Policy);
1923 break;
1924 case tok::kw_int:
1925 DS.SetTypeSpecType(DeclSpec::TST_int, Loc, PrevSpec, DiagID, Policy);
1926 break;
1927 case tok::kw___int128:
1928 DS.SetTypeSpecType(DeclSpec::TST_int128, Loc, PrevSpec, DiagID, Policy);
1929 break;
1930 case tok::kw_half:
1931 DS.SetTypeSpecType(DeclSpec::TST_half, Loc, PrevSpec, DiagID, Policy);
1932 break;
1933 case tok::kw_float:
1934 DS.SetTypeSpecType(DeclSpec::TST_float, Loc, PrevSpec, DiagID, Policy);
1935 break;
1936 case tok::kw_double:
1937 DS.SetTypeSpecType(DeclSpec::TST_double, Loc, PrevSpec, DiagID, Policy);
1938 break;
1939 case tok::kw__Float16:
1940 DS.SetTypeSpecType(DeclSpec::TST_float16, Loc, PrevSpec, DiagID, Policy);
1941 break;
1942 case tok::kw___float128:
1943 DS.SetTypeSpecType(DeclSpec::TST_float128, Loc, PrevSpec, DiagID, Policy);
1944 break;
1945 case tok::kw_wchar_t:
1946 DS.SetTypeSpecType(DeclSpec::TST_wchar, Loc, PrevSpec, DiagID, Policy);
1947 break;
1948 case tok::kw_char16_t:
1949 DS.SetTypeSpecType(DeclSpec::TST_char16, Loc, PrevSpec, DiagID, Policy);
1950 break;
1951 case tok::kw_char32_t:
1952 DS.SetTypeSpecType(DeclSpec::TST_char32, Loc, PrevSpec, DiagID, Policy);
1953 break;
1954 case tok::kw_bool:
1955 DS.SetTypeSpecType(DeclSpec::TST_bool, Loc, PrevSpec, DiagID, Policy);
1956 break;
1957 case tok::annot_decltype:
1958 case tok::kw_decltype:
1959 DS.SetRangeEnd(ParseDecltypeSpecifier(DS));
1960 return DS.Finish(Actions, Policy);
1961
1962 // GNU typeof support.
1963 case tok::kw_typeof:
1964 ParseTypeofSpecifier(DS);
1965 DS.Finish(Actions, Policy);
1966 return;
1967 }
1968 ConsumeAnyToken();
1969 DS.SetRangeEnd(PrevTokLocation);
1970 DS.Finish(Actions, Policy);
1971}
1972
1973/// ParseCXXTypeSpecifierSeq - Parse a C++ type-specifier-seq (C++
1974/// [dcl.name]), which is a non-empty sequence of type-specifiers,
1975/// e.g., "const short int". Note that the DeclSpec is *not* finished
1976/// by parsing the type-specifier-seq, because these sequences are
1977/// typically followed by some form of declarator. Returns true and
1978/// emits diagnostics if this is not a type-specifier-seq, false
1979/// otherwise.
1980///
1981/// type-specifier-seq: [C++ 8.1]
1982/// type-specifier type-specifier-seq[opt]
1983///
1984bool Parser::ParseCXXTypeSpecifierSeq(DeclSpec &DS) {
1985 ParseSpecifierQualifierList(DS, AS_none, DSC_type_specifier);
1986 DS.Finish(Actions, Actions.getASTContext().getPrintingPolicy());
1987 return false;
1988}
1989
1990/// \brief Finish parsing a C++ unqualified-id that is a template-id of
1991/// some form.
1992///
1993/// This routine is invoked when a '<' is encountered after an identifier or
1994/// operator-function-id is parsed by \c ParseUnqualifiedId() to determine
1995/// whether the unqualified-id is actually a template-id. This routine will
1996/// then parse the template arguments and form the appropriate template-id to
1997/// return to the caller.
1998///
1999/// \param SS the nested-name-specifier that precedes this template-id, if
2000/// we're actually parsing a qualified-id.
2001///
2002/// \param Name for constructor and destructor names, this is the actual
2003/// identifier that may be a template-name.
2004///
2005/// \param NameLoc the location of the class-name in a constructor or
2006/// destructor.
2007///
2008/// \param EnteringContext whether we're entering the scope of the
2009/// nested-name-specifier.
2010///
2011/// \param ObjectType if this unqualified-id occurs within a member access
2012/// expression, the type of the base object whose member is being accessed.
2013///
2014/// \param Id as input, describes the template-name or operator-function-id
2015/// that precedes the '<'. If template arguments were parsed successfully,
2016/// will be updated with the template-id.
2017///
2018/// \param AssumeTemplateId When true, this routine will assume that the name
2019/// refers to a template without performing name lookup to verify.
2020///
2021/// \returns true if a parse error occurred, false otherwise.
2022bool Parser::ParseUnqualifiedIdTemplateId(CXXScopeSpec &SS,
2023 SourceLocation TemplateKWLoc,
2024 IdentifierInfo *Name,
2025 SourceLocation NameLoc,
2026 bool EnteringContext,
2027 ParsedType ObjectType,
2028 UnqualifiedId &Id,
2029 bool AssumeTemplateId) {
2030 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2031, __extension__ __PRETTY_FUNCTION__))
2031 "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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2031, __extension__ __PRETTY_FUNCTION__));
2032
2033 TemplateTy Template;
2034 TemplateNameKind TNK = TNK_Non_template;
2035 switch (Id.getKind()) {
2036 case UnqualifiedId::IK_Identifier:
2037 case UnqualifiedId::IK_OperatorFunctionId:
2038 case UnqualifiedId::IK_LiteralOperatorId:
2039 if (AssumeTemplateId) {
2040 // We defer the injected-class-name checks until we've found whether
2041 // this template-id is used to form a nested-name-specifier or not.
2042 TNK = Actions.ActOnDependentTemplateName(
2043 getCurScope(), SS, TemplateKWLoc, Id, ObjectType, EnteringContext,
2044 Template, /*AllowInjectedClassName*/ true);
2045 if (TNK == TNK_Non_template)
2046 return true;
2047 } else {
2048 bool MemberOfUnknownSpecialization;
2049 TNK = Actions.isTemplateName(getCurScope(), SS,
2050 TemplateKWLoc.isValid(), Id,
2051 ObjectType, EnteringContext, Template,
2052 MemberOfUnknownSpecialization);
2053
2054 if (TNK == TNK_Non_template && MemberOfUnknownSpecialization &&
2055 ObjectType && IsTemplateArgumentList()) {
2056 // We have something like t->getAs<T>(), where getAs is a
2057 // member of an unknown specialization. However, this will only
2058 // parse correctly as a template, so suggest the keyword 'template'
2059 // before 'getAs' and treat this as a dependent template name.
2060 std::string Name;
2061 if (Id.getKind() == UnqualifiedId::IK_Identifier)
2062 Name = Id.Identifier->getName();
2063 else {
2064 Name = "operator ";
2065 if (Id.getKind() == UnqualifiedId::IK_OperatorFunctionId)
2066 Name += getOperatorSpelling(Id.OperatorFunctionId.Operator);
2067 else
2068 Name += Id.Identifier->getName();
2069 }
2070 Diag(Id.StartLocation, diag::err_missing_dependent_template_keyword)
2071 << Name
2072 << FixItHint::CreateInsertion(Id.StartLocation, "template ");
2073 TNK = Actions.ActOnDependentTemplateName(
2074 getCurScope(), SS, TemplateKWLoc, Id, ObjectType, EnteringContext,
2075 Template, /*AllowInjectedClassName*/ true);
2076 if (TNK == TNK_Non_template)
2077 return true;
2078 }
2079 }
2080 break;
2081
2082 case UnqualifiedId::IK_ConstructorName: {
2083 UnqualifiedId TemplateName;
2084 bool MemberOfUnknownSpecialization;
2085 TemplateName.setIdentifier(Name, NameLoc);
2086 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2087 TemplateName, ObjectType,
2088 EnteringContext, Template,
2089 MemberOfUnknownSpecialization);
2090 break;
2091 }
2092
2093 case UnqualifiedId::IK_DestructorName: {
2094 UnqualifiedId TemplateName;
2095 bool MemberOfUnknownSpecialization;
2096 TemplateName.setIdentifier(Name, NameLoc);
2097 if (ObjectType) {
2098 TNK = Actions.ActOnDependentTemplateName(
2099 getCurScope(), SS, TemplateKWLoc, TemplateName, ObjectType,
2100 EnteringContext, Template, /*AllowInjectedClassName*/ true);
2101 if (TNK == TNK_Non_template)
2102 return true;
2103 } else {
2104 TNK = Actions.isTemplateName(getCurScope(), SS, TemplateKWLoc.isValid(),
2105 TemplateName, ObjectType,
2106 EnteringContext, Template,
2107 MemberOfUnknownSpecialization);
2108
2109 if (TNK == TNK_Non_template && !Id.DestructorName.get()) {
2110 Diag(NameLoc, diag::err_destructor_template_id)
2111 << Name << SS.getRange();
2112 return true;
2113 }
2114 }
2115 break;
2116 }
2117
2118 default:
2119 return false;
2120 }
2121
2122 if (TNK == TNK_Non_template)
2123 return false;
2124
2125 // Parse the enclosed template argument list.
2126 SourceLocation LAngleLoc, RAngleLoc;
2127 TemplateArgList TemplateArgs;
2128 if (Tok.is(tok::less) && ParseTemplateIdAfterTemplateName(
2129 true, LAngleLoc, TemplateArgs, RAngleLoc))
2130 return true;
2131
2132 if (Id.getKind() == UnqualifiedId::IK_Identifier ||
2133 Id.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2134 Id.getKind() == UnqualifiedId::IK_LiteralOperatorId) {
2135 // Form a parsed representation of the template-id to be stored in the
2136 // UnqualifiedId.
2137
2138 // FIXME: Store name for literal operator too.
2139 IdentifierInfo *TemplateII =
2140 Id.getKind() == UnqualifiedId::IK_Identifier ? Id.Identifier : nullptr;
2141 OverloadedOperatorKind OpKind = Id.getKind() == UnqualifiedId::IK_Identifier
2142 ? OO_None
2143 : Id.OperatorFunctionId.Operator;
2144
2145 TemplateIdAnnotation *TemplateId = TemplateIdAnnotation::Create(
2146 SS, TemplateKWLoc, Id.StartLocation, TemplateII, OpKind, Template, TNK,
2147 LAngleLoc, RAngleLoc, TemplateArgs, TemplateIds);
2148
2149 Id.setTemplateId(TemplateId);
2150 return false;
2151 }
2152
2153 // Bundle the template arguments together.
2154 ASTTemplateArgsPtr TemplateArgsPtr(TemplateArgs);
2155
2156 // Constructor and destructor names.
2157 TypeResult Type
2158 = Actions.ActOnTemplateIdType(SS, TemplateKWLoc,
2159 Template, Name, NameLoc,
2160 LAngleLoc, TemplateArgsPtr, RAngleLoc,
2161 /*IsCtorOrDtorName=*/true);
2162 if (Type.isInvalid())
2163 return true;
2164
2165 if (Id.getKind() == UnqualifiedId::IK_ConstructorName)
2166 Id.setConstructorName(Type.get(), NameLoc, RAngleLoc);
2167 else
2168 Id.setDestructorName(Id.StartLocation, Type.get(), RAngleLoc);
2169
2170 return false;
2171}
2172
2173/// \brief Parse an operator-function-id or conversion-function-id as part
2174/// of a C++ unqualified-id.
2175///
2176/// This routine is responsible only for parsing the operator-function-id or
2177/// conversion-function-id; it does not handle template arguments in any way.
2178///
2179/// \code
2180/// operator-function-id: [C++ 13.5]
2181/// 'operator' operator
2182///
2183/// operator: one of
2184/// new delete new[] delete[]
2185/// + - * / % ^ & | ~
2186/// ! = < > += -= *= /= %=
2187/// ^= &= |= << >> >>= <<= == !=
2188/// <= >= && || ++ -- , ->* ->
2189/// () [] <=>
2190///
2191/// conversion-function-id: [C++ 12.3.2]
2192/// operator conversion-type-id
2193///
2194/// conversion-type-id:
2195/// type-specifier-seq conversion-declarator[opt]
2196///
2197/// conversion-declarator:
2198/// ptr-operator conversion-declarator[opt]
2199/// \endcode
2200///
2201/// \param SS The nested-name-specifier that preceded this unqualified-id. If
2202/// non-empty, then we are parsing the unqualified-id of a qualified-id.
2203///
2204/// \param EnteringContext whether we are entering the scope of the
2205/// nested-name-specifier.
2206///
2207/// \param ObjectType if this unqualified-id occurs within a member access
2208/// expression, the type of the base object whose member is being accessed.
2209///
2210/// \param Result on a successful parse, contains the parsed unqualified-id.
2211///
2212/// \returns true if parsing fails, false otherwise.
2213bool Parser::ParseUnqualifiedIdOperator(CXXScopeSpec &SS, bool EnteringContext,
2214 ParsedType ObjectType,
2215 UnqualifiedId &Result) {
2216 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2216, __extension__ __PRETTY_FUNCTION__));
2217
2218 // Consume the 'operator' keyword.
2219 SourceLocation KeywordLoc = ConsumeToken();
2220
2221 // Determine what kind of operator name we have.
2222 unsigned SymbolIdx = 0;
2223 SourceLocation SymbolLocations[3];
2224 OverloadedOperatorKind Op = OO_None;
2225 switch (Tok.getKind()) {
2226 case tok::kw_new:
2227 case tok::kw_delete: {
2228 bool isNew = Tok.getKind() == tok::kw_new;
2229 // Consume the 'new' or 'delete'.
2230 SymbolLocations[SymbolIdx++] = ConsumeToken();
2231 // Check for array new/delete.
2232 if (Tok.is(tok::l_square) &&
2233 (!getLangOpts().CPlusPlus11 || NextToken().isNot(tok::l_square))) {
2234 // Consume the '[' and ']'.
2235 BalancedDelimiterTracker T(*this, tok::l_square);
2236 T.consumeOpen();
2237 T.consumeClose();
2238 if (T.getCloseLocation().isInvalid())
2239 return true;
2240
2241 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2242 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2243 Op = isNew? OO_Array_New : OO_Array_Delete;
2244 } else {
2245 Op = isNew? OO_New : OO_Delete;
2246 }
2247 break;
2248 }
2249
2250#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \
2251 case tok::Token: \
2252 SymbolLocations[SymbolIdx++] = ConsumeToken(); \
2253 Op = OO_##Name; \
2254 break;
2255#define OVERLOADED_OPERATOR_MULTI(Name,Spelling,Unary,Binary,MemberOnly)
2256#include "clang/Basic/OperatorKinds.def"
2257
2258 case tok::l_paren: {
2259 // Consume the '(' and ')'.
2260 BalancedDelimiterTracker T(*this, tok::l_paren);
2261 T.consumeOpen();
2262 T.consumeClose();
2263 if (T.getCloseLocation().isInvalid())
2264 return true;
2265
2266 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2267 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2268 Op = OO_Call;
2269 break;
2270 }
2271
2272 case tok::l_square: {
2273 // Consume the '[' and ']'.
2274 BalancedDelimiterTracker T(*this, tok::l_square);
2275 T.consumeOpen();
2276 T.consumeClose();
2277 if (T.getCloseLocation().isInvalid())
2278 return true;
2279
2280 SymbolLocations[SymbolIdx++] = T.getOpenLocation();
2281 SymbolLocations[SymbolIdx++] = T.getCloseLocation();
2282 Op = OO_Subscript;
2283 break;
2284 }
2285
2286 case tok::code_completion: {
2287 // Code completion for the operator name.
2288 Actions.CodeCompleteOperatorName(getCurScope());
2289 cutOffParsing();
2290 // Don't try to parse any further.
2291 return true;
2292 }
2293
2294 default:
2295 break;
2296 }
2297
2298 if (Op != OO_None) {
2299 // We have parsed an operator-function-id.
2300 Result.setOperatorFunctionId(KeywordLoc, Op, SymbolLocations);
2301 return false;
2302 }
2303
2304 // Parse a literal-operator-id.
2305 //
2306 // literal-operator-id: C++11 [over.literal]
2307 // operator string-literal identifier
2308 // operator user-defined-string-literal
2309
2310 if (getLangOpts().CPlusPlus11 && isTokenStringLiteral()) {
2311 Diag(Tok.getLocation(), diag::warn_cxx98_compat_literal_operator);
2312
2313 SourceLocation DiagLoc;
2314 unsigned DiagId = 0;
2315
2316 // We're past translation phase 6, so perform string literal concatenation
2317 // before checking for "".
2318 SmallVector<Token, 4> Toks;
2319 SmallVector<SourceLocation, 4> TokLocs;
2320 while (isTokenStringLiteral()) {
2321 if (!Tok.is(tok::string_literal) && !DiagId) {
2322 // C++11 [over.literal]p1:
2323 // The string-literal or user-defined-string-literal in a
2324 // literal-operator-id shall have no encoding-prefix [...].
2325 DiagLoc = Tok.getLocation();
2326 DiagId = diag::err_literal_operator_string_prefix;
2327 }
2328 Toks.push_back(Tok);
2329 TokLocs.push_back(ConsumeStringToken());
2330 }
2331
2332 StringLiteralParser Literal(Toks, PP);
2333 if (Literal.hadError)
2334 return true;
2335
2336 // Grab the literal operator's suffix, which will be either the next token
2337 // or a ud-suffix from the string literal.
2338 IdentifierInfo *II = nullptr;
2339 SourceLocation SuffixLoc;
2340 if (!Literal.getUDSuffix().empty()) {
2341 II = &PP.getIdentifierTable().get(Literal.getUDSuffix());
2342 SuffixLoc =
2343 Lexer::AdvanceToTokenCharacter(TokLocs[Literal.getUDSuffixToken()],
2344 Literal.getUDSuffixOffset(),
2345 PP.getSourceManager(), getLangOpts());
2346 } else if (Tok.is(tok::identifier)) {
2347 II = Tok.getIdentifierInfo();
2348 SuffixLoc = ConsumeToken();
2349 TokLocs.push_back(SuffixLoc);
2350 } else {
2351 Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
2352 return true;
2353 }
2354
2355 // The string literal must be empty.
2356 if (!Literal.GetString().empty() || Literal.Pascal) {
2357 // C++11 [over.literal]p1:
2358 // The string-literal or user-defined-string-literal in a
2359 // literal-operator-id shall [...] contain no characters
2360 // other than the implicit terminating '\0'.
2361 DiagLoc = TokLocs.front();
2362 DiagId = diag::err_literal_operator_string_not_empty;
2363 }
2364
2365 if (DiagId) {
2366 // This isn't a valid literal-operator-id, but we think we know
2367 // what the user meant. Tell them what they should have written.
2368 SmallString<32> Str;
2369 Str += "\"\"";
2370 Str += II->getName();
2371 Diag(DiagLoc, DiagId) << FixItHint::CreateReplacement(
2372 SourceRange(TokLocs.front(), TokLocs.back()), Str);
2373 }
2374
2375 Result.setLiteralOperatorId(II, KeywordLoc, SuffixLoc);
2376
2377 return Actions.checkLiteralOperatorId(SS, Result);
2378 }
2379
2380 // Parse a conversion-function-id.
2381 //
2382 // conversion-function-id: [C++ 12.3.2]
2383 // operator conversion-type-id
2384 //
2385 // conversion-type-id:
2386 // type-specifier-seq conversion-declarator[opt]
2387 //
2388 // conversion-declarator:
2389 // ptr-operator conversion-declarator[opt]
2390
2391 // Parse the type-specifier-seq.
2392 DeclSpec DS(AttrFactory);
2393 if (ParseCXXTypeSpecifierSeq(DS)) // FIXME: ObjectType?
2394 return true;
2395
2396 // Parse the conversion-declarator, which is merely a sequence of
2397 // ptr-operators.
2398 Declarator D(DS, Declarator::ConversionIdContext);
2399 ParseDeclaratorInternal(D, /*DirectDeclParser=*/nullptr);
2400
2401 // Finish up the type.
2402 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), D);
2403 if (Ty.isInvalid())
2404 return true;
2405
2406 // Note that this is a conversion-function-id.
2407 Result.setConversionFunctionId(KeywordLoc, Ty.get(),
2408 D.getSourceRange().getEnd());
2409 return false;
2410}
2411
2412/// \brief Parse a C++ unqualified-id (or a C identifier), which describes the
2413/// name of an entity.
2414///
2415/// \code
2416/// unqualified-id: [C++ expr.prim.general]
2417/// identifier
2418/// operator-function-id
2419/// conversion-function-id
2420/// [C++0x] literal-operator-id [TODO]
2421/// ~ class-name
2422/// template-id
2423///
2424/// \endcode
2425///
2426/// \param SS The nested-name-specifier that preceded this unqualified-id. If
2427/// non-empty, then we are parsing the unqualified-id of a qualified-id.
2428///
2429/// \param EnteringContext whether we are entering the scope of the
2430/// nested-name-specifier.
2431///
2432/// \param AllowDestructorName whether we allow parsing of a destructor name.
2433///
2434/// \param AllowConstructorName whether we allow parsing a constructor name.
2435///
2436/// \param AllowDeductionGuide whether we allow parsing a deduction guide name.
2437///
2438/// \param ObjectType if this unqualified-id occurs within a member access
2439/// expression, the type of the base object whose member is being accessed.
2440///
2441/// \param Result on a successful parse, contains the parsed unqualified-id.
2442///
2443/// \returns true if parsing fails, false otherwise.
2444bool Parser::ParseUnqualifiedId(CXXScopeSpec &SS, bool EnteringContext,
2445 bool AllowDestructorName,
2446 bool AllowConstructorName,
2447 bool AllowDeductionGuide,
2448 ParsedType ObjectType,
2449 SourceLocation& TemplateKWLoc,
2450 UnqualifiedId &Result) {
2451
2452 // Handle 'A::template B'. This is for template-ids which have not
2453 // already been annotated by ParseOptionalCXXScopeSpecifier().
2454 bool TemplateSpecified = false;
2455 if (getLangOpts().CPlusPlus && Tok.is(tok::kw_template) &&
2456 (ObjectType || SS.isSet())) {
2457 TemplateSpecified = true;
2458 TemplateKWLoc = ConsumeToken();
2459 }
2460
2461 // unqualified-id:
2462 // identifier
2463 // template-id (when it hasn't already been annotated)
2464 if (Tok.is(tok::identifier)) {
2465 // Consume the identifier.
2466 IdentifierInfo *Id = Tok.getIdentifierInfo();
2467 SourceLocation IdLoc = ConsumeToken();
2468
2469 if (!getLangOpts().CPlusPlus) {
2470 // If we're not in C++, only identifiers matter. Record the
2471 // identifier and return.
2472 Result.setIdentifier(Id, IdLoc);
2473 return false;
2474 }
2475
2476 ParsedTemplateTy TemplateName;
2477 if (AllowConstructorName &&
2478 Actions.isCurrentClassName(*Id, getCurScope(), &SS)) {
2479 // We have parsed a constructor name.
2480 ParsedType Ty = Actions.getTypeName(*Id, IdLoc, getCurScope(), &SS, false,
2481 false, nullptr,
2482 /*IsCtorOrDtorName=*/true,
2483 /*NonTrivialTypeSourceInfo=*/true);
2484 Result.setConstructorName(Ty, IdLoc, IdLoc);
2485 } else if (getLangOpts().CPlusPlus17 &&
2486 AllowDeductionGuide && SS.isEmpty() &&
2487 Actions.isDeductionGuideName(getCurScope(), *Id, IdLoc,
2488 &TemplateName)) {
2489 // We have parsed a template-name naming a deduction guide.
2490 Result.setDeductionGuideName(TemplateName, IdLoc);
2491 } else {
2492 // We have parsed an identifier.
2493 Result.setIdentifier(Id, IdLoc);
2494 }
2495
2496 // If the next token is a '<', we may have a template.
2497 if (TemplateSpecified || Tok.is(tok::less))
2498 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc, Id, IdLoc,
2499 EnteringContext, ObjectType,
2500 Result, TemplateSpecified);
2501
2502 return false;
2503 }
2504
2505 // unqualified-id:
2506 // template-id (already parsed and annotated)
2507 if (Tok.is(tok::annot_template_id)) {
2508 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
2509
2510 // If the template-name names the current class, then this is a constructor
2511 if (AllowConstructorName && TemplateId->Name &&
2512 Actions.isCurrentClassName(*TemplateId->Name, getCurScope(), &SS)) {
2513 if (SS.isSet()) {
2514 // C++ [class.qual]p2 specifies that a qualified template-name
2515 // is taken as the constructor name where a constructor can be
2516 // declared. Thus, the template arguments are extraneous, so
2517 // complain about them and remove them entirely.
2518 Diag(TemplateId->TemplateNameLoc,
2519 diag::err_out_of_line_constructor_template_id)
2520 << TemplateId->Name
2521 << FixItHint::CreateRemoval(
2522 SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc));
2523 ParsedType Ty =
2524 Actions.getTypeName(*TemplateId->Name, TemplateId->TemplateNameLoc,
2525 getCurScope(), &SS, false, false, nullptr,
2526 /*IsCtorOrDtorName=*/true,
2527 /*NontrivialTypeSourceInfo=*/true);
2528 Result.setConstructorName(Ty, TemplateId->TemplateNameLoc,
2529 TemplateId->RAngleLoc);
2530 ConsumeAnnotationToken();
2531 return false;
2532 }
2533
2534 Result.setConstructorTemplateId(TemplateId);
2535 ConsumeAnnotationToken();
2536 return false;
2537 }
2538
2539 // We have already parsed a template-id; consume the annotation token as
2540 // our unqualified-id.
2541 Result.setTemplateId(TemplateId);
2542 TemplateKWLoc = TemplateId->TemplateKWLoc;
2543 ConsumeAnnotationToken();
2544 return false;
2545 }
2546
2547 // unqualified-id:
2548 // operator-function-id
2549 // conversion-function-id
2550 if (Tok.is(tok::kw_operator)) {
2551 if (ParseUnqualifiedIdOperator(SS, EnteringContext, ObjectType, Result))
2552 return true;
2553
2554 // If we have an operator-function-id or a literal-operator-id and the next
2555 // token is a '<', we may have a
2556 //
2557 // template-id:
2558 // operator-function-id < template-argument-list[opt] >
2559 if ((Result.getKind() == UnqualifiedId::IK_OperatorFunctionId ||
2560 Result.getKind() == UnqualifiedId::IK_LiteralOperatorId) &&
2561 (TemplateSpecified || Tok.is(tok::less)))
2562 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2563 nullptr, SourceLocation(),
2564 EnteringContext, ObjectType,
2565 Result, TemplateSpecified);
2566
2567 return false;
2568 }
2569
2570 if (getLangOpts().CPlusPlus &&
2571 (AllowDestructorName || SS.isSet()) && Tok.is(tok::tilde)) {
2572 // C++ [expr.unary.op]p10:
2573 // There is an ambiguity in the unary-expression ~X(), where X is a
2574 // class-name. The ambiguity is resolved in favor of treating ~ as a
2575 // unary complement rather than treating ~X as referring to a destructor.
2576
2577 // Parse the '~'.
2578 SourceLocation TildeLoc = ConsumeToken();
2579
2580 if (SS.isEmpty() && Tok.is(tok::kw_decltype)) {
2581 DeclSpec DS(AttrFactory);
2582 SourceLocation EndLoc = ParseDecltypeSpecifier(DS);
2583 if (ParsedType Type =
2584 Actions.getDestructorTypeForDecltype(DS, ObjectType)) {
2585 Result.setDestructorName(TildeLoc, Type, EndLoc);
2586 return false;
2587 }
2588 return true;
2589 }
2590
2591 // Parse the class-name.
2592 if (Tok.isNot(tok::identifier)) {
2593 Diag(Tok, diag::err_destructor_tilde_identifier);
2594 return true;
2595 }
2596
2597 // If the user wrote ~T::T, correct it to T::~T.
2598 DeclaratorScopeObj DeclScopeObj(*this, SS);
2599 if (!TemplateSpecified && NextToken().is(tok::coloncolon)) {
2600 // Don't let ParseOptionalCXXScopeSpecifier() "correct"
2601 // `int A; struct { ~A::A(); };` to `int A; struct { ~A:A(); };`,
2602 // it will confuse this recovery logic.
2603 ColonProtectionRAIIObject ColonRAII(*this, false);
2604
2605 if (SS.isSet()) {
2606 AnnotateScopeToken(SS, /*NewAnnotation*/true);
2607 SS.clear();
2608 }
2609 if (ParseOptionalCXXScopeSpecifier(SS, ObjectType, EnteringContext))
2610 return true;
2611 if (SS.isNotEmpty())
2612 ObjectType = nullptr;
2613 if (Tok.isNot(tok::identifier) || NextToken().is(tok::coloncolon) ||
2614 !SS.isSet()) {
2615 Diag(TildeLoc, diag::err_destructor_tilde_scope);
2616 return true;
2617 }
2618
2619 // Recover as if the tilde had been written before the identifier.
2620 Diag(TildeLoc, diag::err_destructor_tilde_scope)
2621 << FixItHint::CreateRemoval(TildeLoc)
2622 << FixItHint::CreateInsertion(Tok.getLocation(), "~");
2623
2624 // Temporarily enter the scope for the rest of this function.
2625 if (Actions.ShouldEnterDeclaratorScope(getCurScope(), SS))
2626 DeclScopeObj.EnterDeclaratorScope();
2627 }
2628
2629 // Parse the class-name (or template-name in a simple-template-id).
2630 IdentifierInfo *ClassName = Tok.getIdentifierInfo();
2631 SourceLocation ClassNameLoc = ConsumeToken();
2632
2633 if (TemplateSpecified || Tok.is(tok::less)) {
2634 Result.setDestructorName(TildeLoc, nullptr, ClassNameLoc);
2635 return ParseUnqualifiedIdTemplateId(SS, TemplateKWLoc,
2636 ClassName, ClassNameLoc,
2637 EnteringContext, ObjectType,
2638 Result, TemplateSpecified);
2639 }
2640
2641 // Note that this is a destructor name.
2642 ParsedType Ty = Actions.getDestructorName(TildeLoc, *ClassName,
2643 ClassNameLoc, getCurScope(),
2644 SS, ObjectType,
2645 EnteringContext);
2646 if (!Ty)
2647 return true;
2648
2649 Result.setDestructorName(TildeLoc, Ty, ClassNameLoc);
2650 return false;
2651 }
2652
2653 Diag(Tok, diag::err_expected_unqualified_id)
2654 << getLangOpts().CPlusPlus;
2655 return true;
2656}
2657
2658/// ParseCXXNewExpression - Parse a C++ new-expression. New is used to allocate
2659/// memory in a typesafe manner and call constructors.
2660///
2661/// This method is called to parse the new expression after the optional :: has
2662/// been already parsed. If the :: was present, "UseGlobal" is true and "Start"
2663/// is its location. Otherwise, "Start" is the location of the 'new' token.
2664///
2665/// new-expression:
2666/// '::'[opt] 'new' new-placement[opt] new-type-id
2667/// new-initializer[opt]
2668/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2669/// new-initializer[opt]
2670///
2671/// new-placement:
2672/// '(' expression-list ')'
2673///
2674/// new-type-id:
2675/// type-specifier-seq new-declarator[opt]
2676/// [GNU] attributes type-specifier-seq new-declarator[opt]
2677///
2678/// new-declarator:
2679/// ptr-operator new-declarator[opt]
2680/// direct-new-declarator
2681///
2682/// new-initializer:
2683/// '(' expression-list[opt] ')'
2684/// [C++0x] braced-init-list
2685///
2686ExprResult
2687Parser::ParseCXXNewExpression(bool UseGlobal, SourceLocation Start) {
2688 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2688, __extension__ __PRETTY_FUNCTION__));
2689 ConsumeToken(); // Consume 'new'
2690
2691 // A '(' now can be a new-placement or the '(' wrapping the type-id in the
2692 // second form of new-expression. It can't be a new-type-id.
2693
2694 ExprVector PlacementArgs;
2695 SourceLocation PlacementLParen, PlacementRParen;
2696
2697 SourceRange TypeIdParens;
2698 DeclSpec DS(AttrFactory);
2699 Declarator DeclaratorInfo(DS, Declarator::CXXNewContext);
2700 if (Tok.is(tok::l_paren)) {
2701 // If it turns out to be a placement, we change the type location.
2702 BalancedDelimiterTracker T(*this, tok::l_paren);
2703 T.consumeOpen();
2704 PlacementLParen = T.getOpenLocation();
2705 if (ParseExpressionListOrTypeId(PlacementArgs, DeclaratorInfo)) {
2706 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2707 return ExprError();
2708 }
2709
2710 T.consumeClose();
2711 PlacementRParen = T.getCloseLocation();
2712 if (PlacementRParen.isInvalid()) {
2713 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2714 return ExprError();
2715 }
2716
2717 if (PlacementArgs.empty()) {
2718 // Reset the placement locations. There was no placement.
2719 TypeIdParens = T.getRange();
2720 PlacementLParen = PlacementRParen = SourceLocation();
2721 } else {
2722 // We still need the type.
2723 if (Tok.is(tok::l_paren)) {
2724 BalancedDelimiterTracker T(*this, tok::l_paren);
2725 T.consumeOpen();
2726 MaybeParseGNUAttributes(DeclaratorInfo);
2727 ParseSpecifierQualifierList(DS);
2728 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2729 ParseDeclarator(DeclaratorInfo);
2730 T.consumeClose();
2731 TypeIdParens = T.getRange();
2732 } else {
2733 MaybeParseGNUAttributes(DeclaratorInfo);
2734 if (ParseCXXTypeSpecifierSeq(DS))
2735 DeclaratorInfo.setInvalidType(true);
2736 else {
2737 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2738 ParseDeclaratorInternal(DeclaratorInfo,
2739 &Parser::ParseDirectNewDeclarator);
2740 }
2741 }
2742 }
2743 } else {
2744 // A new-type-id is a simplified type-id, where essentially the
2745 // direct-declarator is replaced by a direct-new-declarator.
2746 MaybeParseGNUAttributes(DeclaratorInfo);
2747 if (ParseCXXTypeSpecifierSeq(DS))
2748 DeclaratorInfo.setInvalidType(true);
2749 else {
2750 DeclaratorInfo.SetSourceRange(DS.getSourceRange());
2751 ParseDeclaratorInternal(DeclaratorInfo,
2752 &Parser::ParseDirectNewDeclarator);
2753 }
2754 }
2755 if (DeclaratorInfo.isInvalidType()) {
2756 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2757 return ExprError();
2758 }
2759
2760 ExprResult Initializer;
2761
2762 if (Tok.is(tok::l_paren)) {
2763 SourceLocation ConstructorLParen, ConstructorRParen;
2764 ExprVector ConstructorArgs;
2765 BalancedDelimiterTracker T(*this, tok::l_paren);
2766 T.consumeOpen();
2767 ConstructorLParen = T.getOpenLocation();
2768 if (Tok.isNot(tok::r_paren)) {
2769 CommaLocsTy CommaLocs;
2770 if (ParseExpressionList(ConstructorArgs, CommaLocs, [&] {
2771 ParsedType TypeRep = Actions.ActOnTypeName(getCurScope(),
2772 DeclaratorInfo).get();
2773 Actions.CodeCompleteConstructor(getCurScope(),
2774 TypeRep.get()->getCanonicalTypeInternal(),
2775 DeclaratorInfo.getLocEnd(),
2776 ConstructorArgs);
2777 })) {
2778 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2779 return ExprError();
2780 }
2781 }
2782 T.consumeClose();
2783 ConstructorRParen = T.getCloseLocation();
2784 if (ConstructorRParen.isInvalid()) {
2785 SkipUntil(tok::semi, StopAtSemi | StopBeforeMatch);
2786 return ExprError();
2787 }
2788 Initializer = Actions.ActOnParenListExpr(ConstructorLParen,
2789 ConstructorRParen,
2790 ConstructorArgs);
2791 } else if (Tok.is(tok::l_brace) && getLangOpts().CPlusPlus11) {
2792 Diag(Tok.getLocation(),
2793 diag::warn_cxx98_compat_generalized_initializer_lists);
2794 Initializer = ParseBraceInitializer();
2795 }
2796 if (Initializer.isInvalid())
2797 return Initializer;
2798
2799 return Actions.ActOnCXXNew(Start, UseGlobal, PlacementLParen,
2800 PlacementArgs, PlacementRParen,
2801 TypeIdParens, DeclaratorInfo, Initializer.get());
2802}
2803
2804/// ParseDirectNewDeclarator - Parses a direct-new-declarator. Intended to be
2805/// passed to ParseDeclaratorInternal.
2806///
2807/// direct-new-declarator:
2808/// '[' expression ']'
2809/// direct-new-declarator '[' constant-expression ']'
2810///
2811void Parser::ParseDirectNewDeclarator(Declarator &D) {
2812 // Parse the array dimensions.
2813 bool first = true;
2814 while (Tok.is(tok::l_square)) {
2815 // An array-size expression can't start with a lambda.
2816 if (CheckProhibitedCXX11Attribute())
2817 continue;
2818
2819 BalancedDelimiterTracker T(*this, tok::l_square);
2820 T.consumeOpen();
2821
2822 ExprResult Size(first ? ParseExpression()
2823 : ParseConstantExpression());
2824 if (Size.isInvalid()) {
2825 // Recover
2826 SkipUntil(tok::r_square, StopAtSemi);
2827 return;
2828 }
2829 first = false;
2830
2831 T.consumeClose();
2832
2833 // Attributes here appertain to the array type. C++11 [expr.new]p5.
2834 ParsedAttributes Attrs(AttrFactory);
2835 MaybeParseCXX11Attributes(Attrs);
2836
2837 D.AddTypeInfo(DeclaratorChunk::getArray(0,
2838 /*static=*/false, /*star=*/false,
2839 Size.get(),
2840 T.getOpenLocation(),
2841 T.getCloseLocation()),
2842 Attrs, T.getCloseLocation());
2843
2844 if (T.getCloseLocation().isInvalid())
2845 return;
2846 }
2847}
2848
2849/// ParseExpressionListOrTypeId - Parse either an expression-list or a type-id.
2850/// This ambiguity appears in the syntax of the C++ new operator.
2851///
2852/// new-expression:
2853/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
2854/// new-initializer[opt]
2855///
2856/// new-placement:
2857/// '(' expression-list ')'
2858///
2859bool Parser::ParseExpressionListOrTypeId(
2860 SmallVectorImpl<Expr*> &PlacementArgs,
2861 Declarator &D) {
2862 // The '(' was already consumed.
2863 if (isTypeIdInParens()) {
2864 ParseSpecifierQualifierList(D.getMutableDeclSpec());
2865 D.SetSourceRange(D.getDeclSpec().getSourceRange());
2866 ParseDeclarator(D);
2867 return D.isInvalidType();
2868 }
2869
2870 // It's not a type, it has to be an expression list.
2871 // Discard the comma locations - ActOnCXXNew has enough parameters.
2872 CommaLocsTy CommaLocs;
2873 return ParseExpressionList(PlacementArgs, CommaLocs);
2874}
2875
2876/// ParseCXXDeleteExpression - Parse a C++ delete-expression. Delete is used
2877/// to free memory allocated by new.
2878///
2879/// This method is called to parse the 'delete' expression after the optional
2880/// '::' has been already parsed. If the '::' was present, "UseGlobal" is true
2881/// and "Start" is its location. Otherwise, "Start" is the location of the
2882/// 'delete' token.
2883///
2884/// delete-expression:
2885/// '::'[opt] 'delete' cast-expression
2886/// '::'[opt] 'delete' '[' ']' cast-expression
2887ExprResult
2888Parser::ParseCXXDeleteExpression(bool UseGlobal, SourceLocation Start) {
2889 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2889, __extension__ __PRETTY_FUNCTION__));
2890 ConsumeToken(); // Consume 'delete'
2891
2892 // Array delete?
2893 bool ArrayDelete = false;
2894 if (Tok.is(tok::l_square) && NextToken().is(tok::r_square)) {
2895 // C++11 [expr.delete]p1:
2896 // Whenever the delete keyword is followed by empty square brackets, it
2897 // shall be interpreted as [array delete].
2898 // [Footnote: A lambda expression with a lambda-introducer that consists
2899 // of empty square brackets can follow the delete keyword if
2900 // the lambda expression is enclosed in parentheses.]
2901 // FIXME: Produce a better diagnostic if the '[]' is unambiguously a
2902 // lambda-introducer.
2903 ArrayDelete = true;
2904 BalancedDelimiterTracker T(*this, tok::l_square);
2905
2906 T.consumeOpen();
2907 T.consumeClose();
2908 if (T.getCloseLocation().isInvalid())
2909 return ExprError();
2910 }
2911
2912 ExprResult Operand(ParseCastExpression(false));
2913 if (Operand.isInvalid())
2914 return Operand;
2915
2916 return Actions.ActOnCXXDelete(Start, UseGlobal, ArrayDelete, Operand.get());
2917}
2918
2919static TypeTrait TypeTraitFromTokKind(tok::TokenKind kind) {
2920 switch (kind) {
2921 default: llvm_unreachable("Not a known type trait")::llvm::llvm_unreachable_internal("Not a known type trait", "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2921);
2922#define TYPE_TRAIT_1(Spelling, Name, Key) \
2923case tok::kw_ ## Spelling: return UTT_ ## Name;
2924#define TYPE_TRAIT_2(Spelling, Name, Key) \
2925case tok::kw_ ## Spelling: return BTT_ ## Name;
2926#include "clang/Basic/TokenKinds.def"
2927#define TYPE_TRAIT_N(Spelling, Name, Key) \
2928 case tok::kw_ ## Spelling: return TT_ ## Name;
2929#include "clang/Basic/TokenKinds.def"
2930 }
2931}
2932
2933static ArrayTypeTrait ArrayTypeTraitFromTokKind(tok::TokenKind kind) {
2934 switch(kind) {
2935 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2935);
2936 case tok::kw___array_rank: return ATT_ArrayRank;
2937 case tok::kw___array_extent: return ATT_ArrayExtent;
2938 }
2939}
2940
2941static ExpressionTrait ExpressionTraitFromTokKind(tok::TokenKind kind) {
2942 switch(kind) {
2943 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2943);
2944 case tok::kw___is_lvalue_expr: return ET_IsLValueExpr;
2945 case tok::kw___is_rvalue_expr: return ET_IsRValueExpr;
2946 }
2947}
2948
2949static unsigned TypeTraitArity(tok::TokenKind kind) {
2950 switch (kind) {
2951 default: llvm_unreachable("Not a known type trait")::llvm::llvm_unreachable_internal("Not a known type trait", "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 2951);
2952#define TYPE_TRAIT(N,Spelling,K) case tok::kw_##Spelling: return N;
2953#include "clang/Basic/TokenKinds.def"
2954 }
2955}
2956
2957/// \brief Parse the built-in type-trait pseudo-functions that allow
2958/// implementation of the TR1/C++11 type traits templates.
2959///
2960/// primary-expression:
2961/// unary-type-trait '(' type-id ')'
2962/// binary-type-trait '(' type-id ',' type-id ')'
2963/// type-trait '(' type-id-seq ')'
2964///
2965/// type-id-seq:
2966/// type-id ...[opt] type-id-seq[opt]
2967///
2968ExprResult Parser::ParseTypeTrait() {
2969 tok::TokenKind Kind = Tok.getKind();
2970 unsigned Arity = TypeTraitArity(Kind);
2971
2972 SourceLocation Loc = ConsumeToken();
2973
2974 BalancedDelimiterTracker Parens(*this, tok::l_paren);
2975 if (Parens.expectAndConsume())
2976 return ExprError();
2977
2978 SmallVector<ParsedType, 2> Args;
2979 do {
2980 // Parse the next type.
2981 TypeResult Ty = ParseTypeName();
2982 if (Ty.isInvalid()) {
2983 Parens.skipToEnd();
2984 return ExprError();
2985 }
2986
2987 // Parse the ellipsis, if present.
2988 if (Tok.is(tok::ellipsis)) {
2989 Ty = Actions.ActOnPackExpansion(Ty.get(), ConsumeToken());
2990 if (Ty.isInvalid()) {
2991 Parens.skipToEnd();
2992 return ExprError();
2993 }
2994 }
2995
2996 // Add this type to the list of arguments.
2997 Args.push_back(Ty.get());
2998 } while (TryConsumeToken(tok::comma));
2999
3000 if (Parens.consumeClose())
3001 return ExprError();
3002
3003 SourceLocation EndLoc = Parens.getCloseLocation();
3004
3005 if (Arity && Args.size() != Arity) {
3006 Diag(EndLoc, diag::err_type_trait_arity)
3007 << Arity << 0 << (Arity > 1) << (int)Args.size() << SourceRange(Loc);
3008 return ExprError();
3009 }
3010
3011 if (!Arity && Args.empty()) {
3012 Diag(EndLoc, diag::err_type_trait_arity)
3013 << 1 << 1 << 1 << (int)Args.size() << SourceRange(Loc);
3014 return ExprError();
3015 }
3016
3017 return Actions.ActOnTypeTrait(TypeTraitFromTokKind(Kind), Loc, Args, EndLoc);
3018}
3019
3020/// ParseArrayTypeTrait - Parse the built-in array type-trait
3021/// pseudo-functions.
3022///
3023/// primary-expression:
3024/// [Embarcadero] '__array_rank' '(' type-id ')'
3025/// [Embarcadero] '__array_extent' '(' type-id ',' expression ')'
3026///
3027ExprResult Parser::ParseArrayTypeTrait() {
3028 ArrayTypeTrait ATT = ArrayTypeTraitFromTokKind(Tok.getKind());
3029 SourceLocation Loc = ConsumeToken();
3030
3031 BalancedDelimiterTracker T(*this, tok::l_paren);
3032 if (T.expectAndConsume())
3033 return ExprError();
3034
3035 TypeResult Ty = ParseTypeName();
3036 if (Ty.isInvalid()) {
3037 SkipUntil(tok::comma, StopAtSemi);
3038 SkipUntil(tok::r_paren, StopAtSemi);
3039 return ExprError();
3040 }
3041
3042 switch (ATT) {
3043 case ATT_ArrayRank: {
3044 T.consumeClose();
3045 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), nullptr,
3046 T.getCloseLocation());
3047 }
3048 case ATT_ArrayExtent: {
3049 if (ExpectAndConsume(tok::comma)) {
3050 SkipUntil(tok::r_paren, StopAtSemi);
3051 return ExprError();
3052 }
3053
3054 ExprResult DimExpr = ParseExpression();
3055 T.consumeClose();
3056
3057 return Actions.ActOnArrayTypeTrait(ATT, Loc, Ty.get(), DimExpr.get(),
3058 T.getCloseLocation());
3059 }
3060 }
3061 llvm_unreachable("Invalid ArrayTypeTrait!")::llvm::llvm_unreachable_internal("Invalid ArrayTypeTrait!", "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3061);
3062}
3063
3064/// ParseExpressionTrait - Parse built-in expression-trait
3065/// pseudo-functions like __is_lvalue_expr( xxx ).
3066///
3067/// primary-expression:
3068/// [Embarcadero] expression-trait '(' expression ')'
3069///
3070ExprResult Parser::ParseExpressionTrait() {
3071 ExpressionTrait ET = ExpressionTraitFromTokKind(Tok.getKind());
3072 SourceLocation Loc = ConsumeToken();
3073
3074 BalancedDelimiterTracker T(*this, tok::l_paren);
3075 if (T.expectAndConsume())
3076 return ExprError();
3077
3078 ExprResult Expr = ParseExpression();
3079
3080 T.consumeClose();
3081
3082 return Actions.ActOnExpressionTrait(ET, Loc, Expr.get(),
3083 T.getCloseLocation());
3084}
3085
3086
3087/// ParseCXXAmbiguousParenExpression - We have parsed the left paren of a
3088/// parenthesized ambiguous type-id. This uses tentative parsing to disambiguate
3089/// based on the context past the parens.
3090ExprResult
3091Parser::ParseCXXAmbiguousParenExpression(ParenParseOption &ExprType,
3092 ParsedType &CastTy,
3093 BalancedDelimiterTracker &Tracker,
3094 ColonProtectionRAIIObject &ColonProt) {
3095 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3095, __extension__ __PRETTY_FUNCTION__));
3096 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3096, __extension__ __PRETTY_FUNCTION__));
3097 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3097, __extension__ __PRETTY_FUNCTION__));
3098
3099 ExprResult Result(true);
3100 CastTy = nullptr;
3101
3102 // We need to disambiguate a very ugly part of the C++ syntax:
3103 //
3104 // (T())x; - type-id
3105 // (T())*x; - type-id
3106 // (T())/x; - expression
3107 // (T()); - expression
3108 //
3109 // The bad news is that we cannot use the specialized tentative parser, since
3110 // it can only verify that the thing inside the parens can be parsed as
3111 // type-id, it is not useful for determining the context past the parens.
3112 //
3113 // The good news is that the parser can disambiguate this part without
3114 // making any unnecessary Action calls.
3115 //
3116 // It uses a scheme similar to parsing inline methods. The parenthesized
3117 // tokens are cached, the context that follows is determined (possibly by
3118 // parsing a cast-expression), and then we re-introduce the cached tokens
3119 // into the token stream and parse them appropriately.
3120
3121 ParenParseOption ParseAs;
3122 CachedTokens Toks;
3123
3124 // Store the tokens of the parentheses. We will parse them after we determine
3125 // the context that follows them.
3126 if (!ConsumeAndStoreUntil(tok::r_paren, Toks)) {
3127 // We didn't find the ')' we expected.
3128 Tracker.consumeClose();
3129 return ExprError();
3130 }
3131
3132 if (Tok.is(tok::l_brace)) {
3133 ParseAs = CompoundLiteral;
3134 } else {
3135 bool NotCastExpr;
3136 if (Tok.is(tok::l_paren) && NextToken().is(tok::r_paren)) {
3137 NotCastExpr = true;
3138 } else {
3139 // Try parsing the cast-expression that may follow.
3140 // If it is not a cast-expression, NotCastExpr will be true and no token
3141 // will be consumed.
3142 ColonProt.restore();
3143 Result = ParseCastExpression(false/*isUnaryExpression*/,
3144 false/*isAddressofOperand*/,
3145 NotCastExpr,
3146 // type-id has priority.
3147 IsTypeCast);
3148 }
3149
3150 // If we parsed a cast-expression, it's really a type-id, otherwise it's
3151 // an expression.
3152 ParseAs = NotCastExpr ? SimpleExpr : CastExpr;
3153 }
3154
3155 // Create a fake EOF to mark end of Toks buffer.
3156 Token AttrEnd;
3157 AttrEnd.startToken();
3158 AttrEnd.setKind(tok::eof);
3159 AttrEnd.setLocation(Tok.getLocation());
3160 AttrEnd.setEofData(Toks.data());
3161 Toks.push_back(AttrEnd);
3162
3163 // The current token should go after the cached tokens.
3164 Toks.push_back(Tok);
3165 // Re-enter the stored parenthesized tokens into the token stream, so we may
3166 // parse them now.
3167 PP.EnterTokenStream(Toks, true /*DisableMacroExpansion*/);
3168 // Drop the current token and bring the first cached one. It's the same token
3169 // as when we entered this function.
3170 ConsumeAnyToken();
3171
3172 if (ParseAs >= CompoundLiteral) {
3173 // Parse the type declarator.
3174 DeclSpec DS(AttrFactory);
3175 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
3176 {
3177 ColonProtectionRAIIObject InnerColonProtection(*this);
3178 ParseSpecifierQualifierList(DS);
3179 ParseDeclarator(DeclaratorInfo);
3180 }
3181
3182 // Match the ')'.
3183 Tracker.consumeClose();
3184 ColonProt.restore();
3185
3186 // Consume EOF marker for Toks buffer.
3187 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3187, __extension__ __PRETTY_FUNCTION__));
3188 ConsumeAnyToken();
3189
3190 if (ParseAs == CompoundLiteral) {
3191 ExprType = CompoundLiteral;
3192 if (DeclaratorInfo.isInvalidType())
3193 return ExprError();
3194
3195 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
3196 return ParseCompoundLiteralExpression(Ty.get(),
3197 Tracker.getOpenLocation(),
3198 Tracker.getCloseLocation());
3199 }
3200
3201 // We parsed '(' type-id ')' and the thing after it wasn't a '{'.
3202 assert(ParseAs == CastExpr)(static_cast <bool> (ParseAs == CastExpr) ? void (0) : __assert_fail
("ParseAs == CastExpr", "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3202, __extension__ __PRETTY_FUNCTION__));
3203
3204 if (DeclaratorInfo.isInvalidType())
3205 return ExprError();
3206
3207 // Result is what ParseCastExpression returned earlier.
3208 if (!Result.isInvalid())
3209 Result = Actions.ActOnCastExpr(getCurScope(), Tracker.getOpenLocation(),
3210 DeclaratorInfo, CastTy,
3211 Tracker.getCloseLocation(), Result.get());
3212 return Result;
3213 }
3214
3215 // Not a compound literal, and not followed by a cast-expression.
3216 assert(ParseAs == SimpleExpr)(static_cast <bool> (ParseAs == SimpleExpr) ? void (0) :
__assert_fail ("ParseAs == SimpleExpr", "/build/llvm-toolchain-snapshot-6.0~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3216, __extension__ __PRETTY_FUNCTION__));
3217
3218 ExprType = SimpleExpr;
3219 Result = ParseExpression();
3220 if (!Result.isInvalid() && Tok.is(tok::r_paren))
3221 Result = Actions.ActOnParenExpr(Tracker.getOpenLocation(),
3222 Tok.getLocation(), Result.get());
3223
3224 // Match the ')'.
3225 if (Result.isInvalid()) {
3226 while (Tok.isNot(tok::eof))
3227 ConsumeAnyToken();
3228 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3228, __extension__ __PRETTY_FUNCTION__));
3229 ConsumeAnyToken();
3230 return ExprError();
3231 }
3232
3233 Tracker.consumeClose();
3234 // Consume EOF marker for Toks buffer.
3235 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~svn321499/tools/clang/lib/Parse/ParseExprCXX.cpp"
, 3235, __extension__ __PRETTY_FUNCTION__));
3236 ConsumeAnyToken();
3237 return Result;
3238}