1 //===--- ParseExpr.cpp - Expression Parsing -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Provides the Expression parsing implementation.
13 /// Expressions in C99 basically consist of a bunch of binary operators with
14 /// unary operators and other random stuff at the leaves.
16 /// In the C99 grammar, these unary operators bind tightest and are represented
17 /// as the 'cast-expression' production. Everything else is either a binary
18 /// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are
19 /// handled by ParseCastExpression, the higher level pieces are handled by
20 /// ParseBinaryExpression.
22 //===----------------------------------------------------------------------===//
24 #include "clang/Parse/Parser.h"
25 #include "clang/AST/ASTContext.h"
26 #include "clang/Basic/PrettyStackTrace.h"
27 #include "clang/Parse/RAIIObjectsForParser.h"
28 #include "clang/Sema/DeclSpec.h"
29 #include "clang/Sema/ParsedTemplate.h"
30 #include "clang/Sema/Scope.h"
31 #include "clang/Sema/TypoCorrection.h"
32 #include "llvm/ADT/SmallVector.h"
33 using namespace clang;
35 /// \brief Simple precedence-based parser for binary/ternary operators.
37 /// Note: we diverge from the C99 grammar when parsing the assignment-expression
38 /// production. C99 specifies that the LHS of an assignment operator should be
39 /// parsed as a unary-expression, but consistency dictates that it be a
40 /// conditional-expession. In practice, the important thing here is that the
41 /// LHS of an assignment has to be an l-value, which productions between
42 /// unary-expression and conditional-expression don't produce. Because we want
43 /// consistency, we parse the LHS as a conditional-expression, then check for
44 /// l-value-ness in semantic analysis stages.
47 /// pm-expression: [C++ 5.5]
49 /// pm-expression '.*' cast-expression
50 /// pm-expression '->*' cast-expression
52 /// multiplicative-expression: [C99 6.5.5]
53 /// Note: in C++, apply pm-expression instead of cast-expression
55 /// multiplicative-expression '*' cast-expression
56 /// multiplicative-expression '/' cast-expression
57 /// multiplicative-expression '%' cast-expression
59 /// additive-expression: [C99 6.5.6]
60 /// multiplicative-expression
61 /// additive-expression '+' multiplicative-expression
62 /// additive-expression '-' multiplicative-expression
64 /// shift-expression: [C99 6.5.7]
65 /// additive-expression
66 /// shift-expression '<<' additive-expression
67 /// shift-expression '>>' additive-expression
69 /// relational-expression: [C99 6.5.8]
71 /// relational-expression '<' shift-expression
72 /// relational-expression '>' shift-expression
73 /// relational-expression '<=' shift-expression
74 /// relational-expression '>=' shift-expression
76 /// equality-expression: [C99 6.5.9]
77 /// relational-expression
78 /// equality-expression '==' relational-expression
79 /// equality-expression '!=' relational-expression
81 /// AND-expression: [C99 6.5.10]
82 /// equality-expression
83 /// AND-expression '&' equality-expression
85 /// exclusive-OR-expression: [C99 6.5.11]
87 /// exclusive-OR-expression '^' AND-expression
89 /// inclusive-OR-expression: [C99 6.5.12]
90 /// exclusive-OR-expression
91 /// inclusive-OR-expression '|' exclusive-OR-expression
93 /// logical-AND-expression: [C99 6.5.13]
94 /// inclusive-OR-expression
95 /// logical-AND-expression '&&' inclusive-OR-expression
97 /// logical-OR-expression: [C99 6.5.14]
98 /// logical-AND-expression
99 /// logical-OR-expression '||' logical-AND-expression
101 /// conditional-expression: [C99 6.5.15]
102 /// logical-OR-expression
103 /// logical-OR-expression '?' expression ':' conditional-expression
104 /// [GNU] logical-OR-expression '?' ':' conditional-expression
105 /// [C++] the third operand is an assignment-expression
107 /// assignment-expression: [C99 6.5.16]
108 /// conditional-expression
109 /// unary-expression assignment-operator assignment-expression
110 /// [C++] throw-expression [C++ 15]
112 /// assignment-operator: one of
113 /// = *= /= %= += -= <<= >>= &= ^= |=
115 /// expression: [C99 6.5.17]
116 /// assignment-expression ...[opt]
117 /// expression ',' assignment-expression ...[opt]
119 ExprResult Parser::ParseExpression(TypeCastState isTypeCast) {
120 ExprResult LHS(ParseAssignmentExpression(isTypeCast));
121 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
124 /// This routine is called when the '@' is seen and consumed.
125 /// Current token is an Identifier and is not a 'try'. This
126 /// routine is necessary to disambiguate \@try-statement from,
127 /// for example, \@encode-expression.
130 Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
131 ExprResult LHS(ParseObjCAtExpression(AtLoc));
132 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
135 /// This routine is called when a leading '__extension__' is seen and
136 /// consumed. This is necessary because the token gets consumed in the
137 /// process of disambiguating between an expression and a declaration.
139 Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
140 ExprResult LHS(true);
142 // Silence extension warnings in the sub-expression
143 ExtensionRAIIObject O(Diags);
145 LHS = ParseCastExpression(false);
148 if (!LHS.isInvalid())
149 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__,
152 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
155 /// \brief Parse an expr that doesn't include (top-level) commas.
156 ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) {
157 if (Tok.is(tok::code_completion)) {
158 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
163 if (Tok.is(tok::kw_throw))
164 return ParseThrowExpression();
165 if (Tok.is(tok::kw_co_yield))
166 return ParseCoyieldExpression();
168 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false,
169 /*isAddressOfOperand=*/false,
171 return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
174 /// \brief Parse an assignment expression where part of an Objective-C message
175 /// send has already been parsed.
177 /// In this case \p LBracLoc indicates the location of the '[' of the message
178 /// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
179 /// the receiver of the message.
181 /// Since this handles full assignment-expression's, it handles postfix
182 /// expressions and other binary operators for these expressions as well.
184 Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
185 SourceLocation SuperLoc,
186 ParsedType ReceiverType,
187 Expr *ReceiverExpr) {
189 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
190 ReceiverType, ReceiverExpr);
191 R = ParsePostfixExpressionSuffix(R);
192 return ParseRHSOfBinaryExpression(R, prec::Assignment);
196 ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
197 // C++03 [basic.def.odr]p2:
198 // An expression is potentially evaluated unless it appears where an
199 // integral constant expression is required (see 5.19) [...].
200 // C++98 and C++11 have no such rule, but this is only a defect in C++98.
201 EnterExpressionEvaluationContext ConstantEvaluated(
202 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
204 ExprResult LHS(ParseCastExpression(false, false, isTypeCast));
205 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
206 return Actions.ActOnConstantExpression(Res);
209 /// \brief Parse a constraint-expression.
212 /// constraint-expression: [Concepts TS temp.constr.decl p1]
213 /// logical-or-expression
215 ExprResult Parser::ParseConstraintExpression() {
216 // FIXME: this may erroneously consume a function-body as the braced
217 // initializer list of a compound literal
219 // FIXME: this may erroneously consume a parenthesized rvalue reference
220 // declarator as a parenthesized address-of-label expression
221 ExprResult LHS(ParseCastExpression(/*isUnaryExpression=*/false));
222 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::LogicalOr));
227 bool Parser::isNotExpressionStart() {
228 tok::TokenKind K = Tok.getKind();
229 if (K == tok::l_brace || K == tok::r_brace ||
230 K == tok::kw_for || K == tok::kw_while ||
231 K == tok::kw_if || K == tok::kw_else ||
232 K == tok::kw_goto || K == tok::kw_try)
234 // If this is a decl-specifier, we can't be at the start of an expression.
235 return isKnownToBeDeclarationSpecifier();
238 static bool isFoldOperator(prec::Level Level) {
239 return Level > prec::Unknown && Level != prec::Conditional;
241 static bool isFoldOperator(tok::TokenKind Kind) {
242 return isFoldOperator(getBinOpPrecedence(Kind, false, true));
245 /// \brief Parse a binary expression that starts with \p LHS and has a
246 /// precedence of at least \p MinPrec.
248 Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
249 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
250 GreaterThanIsOperator,
251 getLangOpts().CPlusPlus11);
252 SourceLocation ColonLoc;
255 // If this token has a lower precedence than we are allowed to parse (e.g.
256 // because we are called recursively, or because the token is not a binop),
258 if (NextTokPrec < MinPrec)
261 // Consume the operator, saving the operator token for error reporting.
265 if (OpToken.is(tok::caretcaret)) {
266 return ExprError(Diag(Tok, diag::err_opencl_logical_exclusive_or));
268 // Bail out when encountering a comma followed by a token which can't
269 // possibly be the start of an expression. For instance:
270 // int f() { return 1, }
271 // We can't do this before consuming the comma, because
272 // isNotExpressionStart() looks at the token stream.
273 if (OpToken.is(tok::comma) && isNotExpressionStart()) {
279 // If the next token is an ellipsis, then this is a fold-expression. Leave
280 // it alone so we can handle it in the paren expression.
281 if (isFoldOperator(NextTokPrec) && Tok.is(tok::ellipsis)) {
282 // FIXME: We can't check this via lookahead before we consume the token
283 // because that tickles a lexer bug.
289 // Special case handling for the ternary operator.
290 ExprResult TernaryMiddle(true);
291 if (NextTokPrec == prec::Conditional) {
292 if (Tok.isNot(tok::colon)) {
293 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
294 ColonProtectionRAIIObject X(*this);
296 // Handle this production specially:
297 // logical-OR-expression '?' expression ':' conditional-expression
298 // In particular, the RHS of the '?' is 'expression', not
299 // 'logical-OR-expression' as we might expect.
300 TernaryMiddle = ParseExpression();
301 if (TernaryMiddle.isInvalid()) {
302 Actions.CorrectDelayedTyposInExpr(LHS);
304 TernaryMiddle = nullptr;
307 // Special case handling of "X ? Y : Z" where Y is empty:
308 // logical-OR-expression '?' ':' conditional-expression [GNU]
309 TernaryMiddle = nullptr;
310 Diag(Tok, diag::ext_gnu_conditional_expr);
313 if (!TryConsumeToken(tok::colon, ColonLoc)) {
314 // Otherwise, we're missing a ':'. Assume that this was a typo that
315 // the user forgot. If we're not in a macro expansion, we can suggest
316 // a fixit hint. If there were two spaces before the current token,
317 // suggest inserting the colon in between them, otherwise insert ": ".
318 SourceLocation FILoc = Tok.getLocation();
319 const char *FIText = ": ";
320 const SourceManager &SM = PP.getSourceManager();
321 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
322 assert(FILoc.isFileID());
323 bool IsInvalid = false;
324 const char *SourcePtr =
325 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
326 if (!IsInvalid && *SourcePtr == ' ') {
328 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
329 if (!IsInvalid && *SourcePtr == ' ') {
330 FILoc = FILoc.getLocWithOffset(-1);
336 Diag(Tok, diag::err_expected)
337 << tok::colon << FixItHint::CreateInsertion(FILoc, FIText);
338 Diag(OpToken, diag::note_matching) << tok::question;
339 ColonLoc = Tok.getLocation();
343 // Code completion for the right-hand side of an assignment expression
344 // goes through a special hook that takes the left-hand side into account.
345 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) {
346 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get());
351 // Parse another leaf here for the RHS of the operator.
352 // ParseCastExpression works here because all RHS expressions in C have it
353 // as a prefix, at least. However, in C++, an assignment-expression could
354 // be a throw-expression, which is not a valid cast-expression.
355 // Therefore we need some special-casing here.
356 // Also note that the third operand of the conditional operator is
357 // an assignment-expression in C++, and in C++11, we can have a
358 // braced-init-list on the RHS of an assignment. For better diagnostics,
359 // parse as if we were allowed braced-init-lists everywhere, and check that
360 // they only appear on the RHS of assignments later.
362 bool RHSIsInitList = false;
363 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
364 RHS = ParseBraceInitializer();
365 RHSIsInitList = true;
366 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
367 RHS = ParseAssignmentExpression();
369 RHS = ParseCastExpression(false);
371 if (RHS.isInvalid()) {
372 // FIXME: Errors generated by the delayed typo correction should be
373 // printed before errors from parsing the RHS, not after.
374 Actions.CorrectDelayedTyposInExpr(LHS);
375 if (TernaryMiddle.isUsable())
376 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
380 // Remember the precedence of this operator and get the precedence of the
381 // operator immediately to the right of the RHS.
382 prec::Level ThisPrec = NextTokPrec;
383 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
384 getLangOpts().CPlusPlus11);
386 // Assignment and conditional expressions are right-associative.
387 bool isRightAssoc = ThisPrec == prec::Conditional ||
388 ThisPrec == prec::Assignment;
390 // Get the precedence of the operator to the right of the RHS. If it binds
391 // more tightly with RHS than we do, evaluate it completely first.
392 if (ThisPrec < NextTokPrec ||
393 (ThisPrec == NextTokPrec && isRightAssoc)) {
394 if (!RHS.isInvalid() && RHSIsInitList) {
395 Diag(Tok, diag::err_init_list_bin_op)
396 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
399 // If this is left-associative, only parse things on the RHS that bind
400 // more tightly than the current operator. If it is left-associative, it
401 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as
402 // A=(B=(C=D)), where each paren is a level of recursion here.
403 // The function takes ownership of the RHS.
404 RHS = ParseRHSOfBinaryExpression(RHS,
405 static_cast<prec::Level>(ThisPrec + !isRightAssoc));
406 RHSIsInitList = false;
408 if (RHS.isInvalid()) {
409 // FIXME: Errors generated by the delayed typo correction should be
410 // printed before errors from ParseRHSOfBinaryExpression, not after.
411 Actions.CorrectDelayedTyposInExpr(LHS);
412 if (TernaryMiddle.isUsable())
413 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
417 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
418 getLangOpts().CPlusPlus11);
421 if (!RHS.isInvalid() && RHSIsInitList) {
422 if (ThisPrec == prec::Assignment) {
423 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
424 << Actions.getExprRange(RHS.get());
426 Diag(OpToken, diag::err_init_list_bin_op)
427 << /*RHS*/1 << PP.getSpelling(OpToken)
428 << Actions.getExprRange(RHS.get());
433 ExprResult OrigLHS = LHS;
434 if (!LHS.isInvalid()) {
435 // Combine the LHS and RHS into the LHS (e.g. build AST).
436 if (TernaryMiddle.isInvalid()) {
437 // If we're using '>>' as an operator within a template
438 // argument list (in C++98), suggest the addition of
439 // parentheses so that the code remains well-formed in C++0x.
440 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
441 SuggestParentheses(OpToken.getLocation(),
442 diag::warn_cxx11_right_shift_in_template_arg,
443 SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
444 Actions.getExprRange(RHS.get()).getEnd()));
446 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
447 OpToken.getKind(), LHS.get(), RHS.get());
450 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
451 LHS.get(), TernaryMiddle.get(),
454 // In this case, ActOnBinOp or ActOnConditionalOp performed the
455 // CorrectDelayedTyposInExpr check.
456 if (!getLangOpts().CPlusPlus)
460 // Ensure potential typos aren't left undiagnosed.
461 if (LHS.isInvalid()) {
462 Actions.CorrectDelayedTyposInExpr(OrigLHS);
463 Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
464 Actions.CorrectDelayedTyposInExpr(RHS);
469 /// \brief Parse a cast-expression, or, if \p isUnaryExpression is true,
470 /// parse a unary-expression.
472 /// \p isAddressOfOperand exists because an id-expression that is the
473 /// operand of address-of gets special treatment due to member pointers.
475 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
476 bool isAddressOfOperand,
477 TypeCastState isTypeCast,
478 bool isVectorLiteral) {
480 ExprResult Res = ParseCastExpression(isUnaryExpression,
486 Diag(Tok, diag::err_expected_expression);
491 class CastExpressionIdValidator : public CorrectionCandidateCallback {
493 CastExpressionIdValidator(Token Next, bool AllowTypes, bool AllowNonTypes)
494 : NextToken(Next), AllowNonTypes(AllowNonTypes) {
495 WantTypeSpecifiers = WantFunctionLikeCasts = AllowTypes;
498 bool ValidateCandidate(const TypoCorrection &candidate) override {
499 NamedDecl *ND = candidate.getCorrectionDecl();
501 return candidate.isKeyword();
503 if (isa<TypeDecl>(ND))
504 return WantTypeSpecifiers;
506 if (!AllowNonTypes || !CorrectionCandidateCallback::ValidateCandidate(candidate))
509 if (!NextToken.isOneOf(tok::equal, tok::arrow, tok::period))
512 for (auto *C : candidate) {
513 NamedDecl *ND = C->getUnderlyingDecl();
514 if (isa<ValueDecl>(ND) && !isa<FunctionDecl>(ND))
526 /// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse
527 /// a unary-expression.
529 /// \p isAddressOfOperand exists because an id-expression that is the operand
530 /// of address-of gets special treatment due to member pointers. NotCastExpr
531 /// is set to true if the token is not the start of a cast-expression, and no
532 /// diagnostic is emitted in this case and no tokens are consumed.
535 /// cast-expression: [C99 6.5.4]
537 /// '(' type-name ')' cast-expression
539 /// unary-expression: [C99 6.5.3]
540 /// postfix-expression
541 /// '++' unary-expression
542 /// '--' unary-expression
543 /// [Coro] 'co_await' cast-expression
544 /// unary-operator cast-expression
545 /// 'sizeof' unary-expression
546 /// 'sizeof' '(' type-name ')'
547 /// [C++11] 'sizeof' '...' '(' identifier ')'
548 /// [GNU] '__alignof' unary-expression
549 /// [GNU] '__alignof' '(' type-name ')'
550 /// [C11] '_Alignof' '(' type-name ')'
551 /// [C++11] 'alignof' '(' type-id ')'
552 /// [GNU] '&&' identifier
553 /// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
554 /// [C++] new-expression
555 /// [C++] delete-expression
557 /// unary-operator: one of
558 /// '&' '*' '+' '-' '~' '!'
559 /// [GNU] '__extension__' '__real' '__imag'
561 /// primary-expression: [C99 6.5.1]
563 /// [C++] id-expression
566 /// [C++] boolean-literal [C++ 2.13.5]
567 /// [C++11] 'nullptr' [C++11 2.14.7]
568 /// [C++11] user-defined-literal
569 /// '(' expression ')'
570 /// [C11] generic-selection
571 /// '__func__' [C99 6.4.2.2]
572 /// [GNU] '__FUNCTION__'
573 /// [MS] '__FUNCDNAME__'
574 /// [MS] 'L__FUNCTION__'
575 /// [GNU] '__PRETTY_FUNCTION__'
576 /// [GNU] '(' compound-statement ')'
577 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
578 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
579 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
581 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
583 /// [OBJC] '[' objc-message-expr ']'
584 /// [OBJC] '\@selector' '(' objc-selector-arg ')'
585 /// [OBJC] '\@protocol' '(' identifier ')'
586 /// [OBJC] '\@encode' '(' type-name ')'
587 /// [OBJC] objc-string-literal
588 /// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
589 /// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
590 /// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
591 /// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
592 /// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
593 /// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
594 /// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
595 /// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
596 /// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
597 /// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
598 /// [C++] 'this' [C++ 9.3.2]
599 /// [G++] unary-type-trait '(' type-id ')'
600 /// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
601 /// [EMBT] array-type-trait '(' type-id ',' integer ')'
602 /// [clang] '^' block-literal
604 /// constant: [C99 6.4.4]
606 /// floating-constant
607 /// enumeration-constant -> identifier
608 /// character-constant
610 /// id-expression: [C++ 5.1]
614 /// unqualified-id: [C++ 5.1]
616 /// operator-function-id
617 /// conversion-function-id
621 /// new-expression: [C++ 5.3.4]
622 /// '::'[opt] 'new' new-placement[opt] new-type-id
623 /// new-initializer[opt]
624 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
625 /// new-initializer[opt]
627 /// delete-expression: [C++ 5.3.5]
628 /// '::'[opt] 'delete' cast-expression
629 /// '::'[opt] 'delete' '[' ']' cast-expression
631 /// [GNU/Embarcadero] unary-type-trait:
632 /// '__is_arithmetic'
633 /// '__is_floating_point'
635 /// '__is_lvalue_expr'
636 /// '__is_rvalue_expr'
637 /// '__is_complete_type'
642 /// '__is_lvalue_reference'
643 /// '__is_rvalue_reference'
644 /// '__is_fundamental'
649 /// '__is_member_object_pointer'
650 /// '__is_member_function_pointer'
651 /// '__is_member_pointer'
655 /// '__is_standard_layout'
659 /// [GNU] unary-type-trait:
660 /// '__has_nothrow_assign'
661 /// '__has_nothrow_copy'
662 /// '__has_nothrow_constructor'
663 /// '__has_trivial_assign' [TODO]
664 /// '__has_trivial_copy' [TODO]
665 /// '__has_trivial_constructor'
666 /// '__has_trivial_destructor'
667 /// '__has_virtual_destructor'
668 /// '__is_abstract' [TODO]
670 /// '__is_empty' [TODO]
674 /// '__is_polymorphic'
675 /// '__is_sealed' [MS]
679 /// [Clang] unary-type-trait:
681 /// '__trivially_copyable'
683 /// binary-type-trait:
684 /// [GNU] '__is_base_of'
685 /// [MS] '__is_convertible_to'
686 /// '__is_convertible'
689 /// [Embarcadero] array-type-trait:
693 /// [Embarcadero] expression-trait:
694 /// '__is_lvalue_expr'
695 /// '__is_rvalue_expr'
698 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
699 bool isAddressOfOperand,
701 TypeCastState isTypeCast,
702 bool isVectorLiteral) {
704 tok::TokenKind SavedKind = Tok.getKind();
707 // This handles all of cast-expression, unary-expression, postfix-expression,
708 // and primary-expression. We handle them together like this for efficiency
709 // and to simplify handling of an expression starting with a '(' token: which
710 // may be one of a parenthesized expression, cast-expression, compound literal
711 // expression, or statement expression.
713 // If the parsed tokens consist of a primary-expression, the cases below
714 // break out of the switch; at the end we call ParsePostfixExpressionSuffix
715 // to handle the postfix expression suffixes. Cases that cannot be followed
716 // by postfix exprs should return without invoking
717 // ParsePostfixExpressionSuffix.
720 // If this expression is limited to being a unary-expression, the parent can
721 // not start a cast expression.
722 ParenParseOption ParenExprType =
723 (isUnaryExpression && !getLangOpts().CPlusPlus) ? CompoundLiteral
726 SourceLocation RParenLoc;
727 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
728 isTypeCast == IsTypeCast, CastTy, RParenLoc);
733 switch (ParenExprType) {
734 case SimpleExpr: break; // Nothing else to do.
735 case CompoundStmt: break; // Nothing else to do.
736 case CompoundLiteral:
737 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
738 // postfix-expression exist, parse them now.
741 // We have parsed the cast-expression and no postfix-expr pieces are
749 // primary-expression
750 case tok::numeric_constant:
751 // constant: integer-constant
752 // constant: floating-constant
754 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
760 return ParseCXXBoolLiteral();
762 case tok::kw___objc_yes:
763 case tok::kw___objc_no:
764 return ParseObjCBoolLiteral();
766 case tok::kw_nullptr:
767 Diag(Tok, diag::warn_cxx98_compat_nullptr);
768 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
770 case tok::annot_primary_expr:
771 assert(Res.get() == nullptr && "Stray primary-expression annotation?");
772 Res = getExprAnnotation(Tok);
776 case tok::kw___super:
777 case tok::kw_decltype:
778 // Annotate the token and tail recurse.
779 if (TryAnnotateTypeOrScopeToken())
781 assert(Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super));
782 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
784 case tok::identifier: { // primary-expression: identifier
785 // unqualified-id: identifier
786 // constant: enumeration-constant
787 // Turn a potentially qualified name into a annot_typename or
788 // annot_cxxscope if it would be valid. This handles things like x::y, etc.
789 if (getLangOpts().CPlusPlus) {
790 // Avoid the unnecessary parse-time lookup in the common case
791 // where the syntax forbids a type.
792 const Token &Next = NextToken();
794 // If this identifier was reverted from a token ID, and the next token
795 // is a parenthesis, this is likely to be a use of a type trait. Check
797 if (Next.is(tok::l_paren) &&
798 Tok.is(tok::identifier) &&
799 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
800 IdentifierInfo *II = Tok.getIdentifierInfo();
801 // Build up the mapping of revertible type traits, for future use.
802 if (RevertibleTypeTraits.empty()) {
803 #define RTT_JOIN(X,Y) X##Y
804 #define REVERTIBLE_TYPE_TRAIT(Name) \
805 RevertibleTypeTraits[PP.getIdentifierInfo(#Name)] \
806 = RTT_JOIN(tok::kw_,Name)
808 REVERTIBLE_TYPE_TRAIT(__is_abstract);
809 REVERTIBLE_TYPE_TRAIT(__is_aggregate);
810 REVERTIBLE_TYPE_TRAIT(__is_arithmetic);
811 REVERTIBLE_TYPE_TRAIT(__is_array);
812 REVERTIBLE_TYPE_TRAIT(__is_assignable);
813 REVERTIBLE_TYPE_TRAIT(__is_base_of);
814 REVERTIBLE_TYPE_TRAIT(__is_class);
815 REVERTIBLE_TYPE_TRAIT(__is_complete_type);
816 REVERTIBLE_TYPE_TRAIT(__is_compound);
817 REVERTIBLE_TYPE_TRAIT(__is_const);
818 REVERTIBLE_TYPE_TRAIT(__is_constructible);
819 REVERTIBLE_TYPE_TRAIT(__is_convertible);
820 REVERTIBLE_TYPE_TRAIT(__is_convertible_to);
821 REVERTIBLE_TYPE_TRAIT(__is_destructible);
822 REVERTIBLE_TYPE_TRAIT(__is_empty);
823 REVERTIBLE_TYPE_TRAIT(__is_enum);
824 REVERTIBLE_TYPE_TRAIT(__is_floating_point);
825 REVERTIBLE_TYPE_TRAIT(__is_final);
826 REVERTIBLE_TYPE_TRAIT(__is_function);
827 REVERTIBLE_TYPE_TRAIT(__is_fundamental);
828 REVERTIBLE_TYPE_TRAIT(__is_integral);
829 REVERTIBLE_TYPE_TRAIT(__is_interface_class);
830 REVERTIBLE_TYPE_TRAIT(__is_literal);
831 REVERTIBLE_TYPE_TRAIT(__is_lvalue_expr);
832 REVERTIBLE_TYPE_TRAIT(__is_lvalue_reference);
833 REVERTIBLE_TYPE_TRAIT(__is_member_function_pointer);
834 REVERTIBLE_TYPE_TRAIT(__is_member_object_pointer);
835 REVERTIBLE_TYPE_TRAIT(__is_member_pointer);
836 REVERTIBLE_TYPE_TRAIT(__is_nothrow_assignable);
837 REVERTIBLE_TYPE_TRAIT(__is_nothrow_constructible);
838 REVERTIBLE_TYPE_TRAIT(__is_nothrow_destructible);
839 REVERTIBLE_TYPE_TRAIT(__is_object);
840 REVERTIBLE_TYPE_TRAIT(__is_pod);
841 REVERTIBLE_TYPE_TRAIT(__is_pointer);
842 REVERTIBLE_TYPE_TRAIT(__is_polymorphic);
843 REVERTIBLE_TYPE_TRAIT(__is_reference);
844 REVERTIBLE_TYPE_TRAIT(__is_rvalue_expr);
845 REVERTIBLE_TYPE_TRAIT(__is_rvalue_reference);
846 REVERTIBLE_TYPE_TRAIT(__is_same);
847 REVERTIBLE_TYPE_TRAIT(__is_scalar);
848 REVERTIBLE_TYPE_TRAIT(__is_sealed);
849 REVERTIBLE_TYPE_TRAIT(__is_signed);
850 REVERTIBLE_TYPE_TRAIT(__is_standard_layout);
851 REVERTIBLE_TYPE_TRAIT(__is_trivial);
852 REVERTIBLE_TYPE_TRAIT(__is_trivially_assignable);
853 REVERTIBLE_TYPE_TRAIT(__is_trivially_constructible);
854 REVERTIBLE_TYPE_TRAIT(__is_trivially_copyable);
855 REVERTIBLE_TYPE_TRAIT(__is_union);
856 REVERTIBLE_TYPE_TRAIT(__is_unsigned);
857 REVERTIBLE_TYPE_TRAIT(__is_void);
858 REVERTIBLE_TYPE_TRAIT(__is_volatile);
859 #undef REVERTIBLE_TYPE_TRAIT
863 // If we find that this is in fact the name of a type trait,
864 // update the token kind in place and parse again to treat it as
865 // the appropriate kind of type trait.
866 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
867 = RevertibleTypeTraits.find(II);
868 if (Known != RevertibleTypeTraits.end()) {
869 Tok.setKind(Known->second);
870 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
871 NotCastExpr, isTypeCast);
875 if ((!ColonIsSacred && Next.is(tok::colon)) ||
876 Next.isOneOf(tok::coloncolon, tok::less, tok::l_paren,
878 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
879 if (TryAnnotateTypeOrScopeToken())
881 if (!Tok.is(tok::identifier))
882 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
886 // Consume the identifier so that we can see if it is followed by a '(' or
888 IdentifierInfo &II = *Tok.getIdentifierInfo();
889 SourceLocation ILoc = ConsumeToken();
891 // Support 'Class.property' and 'super.property' notation.
892 if (getLangOpts().ObjC1 && Tok.is(tok::period) &&
893 (Actions.getTypeName(II, ILoc, getCurScope()) ||
894 // Allow the base to be 'super' if in an objc-method.
895 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
898 if (Tok.is(tok::code_completion) && &II != Ident_super) {
899 Actions.CodeCompleteObjCClassPropertyRefExpr(
900 getCurScope(), II, ILoc, ExprStatementTokLoc == ILoc);
904 // Allow either an identifier or the keyword 'class' (in C++).
905 if (Tok.isNot(tok::identifier) &&
906 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
907 Diag(Tok, diag::err_expected_property_name);
910 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
911 SourceLocation PropertyLoc = ConsumeToken();
913 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
918 // In an Objective-C method, if we have "super" followed by an identifier,
919 // the token sequence is ill-formed. However, if there's a ':' or ']' after
920 // that identifier, this is probably a message send with a missing open
921 // bracket. Treat it as such.
922 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression &&
923 getCurScope()->isInObjcMethodScope() &&
924 ((Tok.is(tok::identifier) &&
925 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
926 Tok.is(tok::code_completion))) {
927 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, nullptr,
932 // If we have an Objective-C class name followed by an identifier
933 // and either ':' or ']', this is an Objective-C class message
934 // send that's missing the opening '['. Recovery
935 // appropriately. Also take this path if we're performing code
936 // completion after an Objective-C class name.
937 if (getLangOpts().ObjC1 &&
938 ((Tok.is(tok::identifier) && !InMessageExpression) ||
939 Tok.is(tok::code_completion))) {
940 const Token& Next = NextToken();
941 if (Tok.is(tok::code_completion) ||
942 Next.is(tok::colon) || Next.is(tok::r_square))
943 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
944 if (Typ.get()->isObjCObjectOrInterfaceType()) {
945 // Fake up a Declarator to use with ActOnTypeName.
946 DeclSpec DS(AttrFactory);
947 DS.SetRangeStart(ILoc);
948 DS.SetRangeEnd(ILoc);
949 const char *PrevSpec = nullptr;
951 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ,
952 Actions.getASTContext().getPrintingPolicy());
954 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
955 TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
960 Res = ParseObjCMessageExpressionBody(SourceLocation(),
967 // Make sure to pass down the right value for isAddressOfOperand.
968 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
969 isAddressOfOperand = false;
971 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we
972 // need to know whether or not this identifier is a function designator or
975 CXXScopeSpec ScopeSpec;
976 SourceLocation TemplateKWLoc;
978 auto Validator = llvm::make_unique<CastExpressionIdValidator>(
979 Tok, isTypeCast != NotTypeCast, isTypeCast != IsTypeCast);
980 Validator->IsAddressOfOperand = isAddressOfOperand;
981 if (Tok.isOneOf(tok::periodstar, tok::arrowstar)) {
982 Validator->WantExpressionKeywords = false;
983 Validator->WantRemainingKeywords = false;
985 Validator->WantRemainingKeywords = Tok.isNot(tok::r_paren);
987 Name.setIdentifier(&II, ILoc);
988 Res = Actions.ActOnIdExpression(
989 getCurScope(), ScopeSpec, TemplateKWLoc, Name, Tok.is(tok::l_paren),
990 isAddressOfOperand, std::move(Validator),
991 /*IsInlineAsmIdentifier=*/false,
992 Tok.is(tok::r_paren) ? nullptr : &Replacement);
993 if (!Res.isInvalid() && !Res.get()) {
994 UnconsumeToken(Replacement);
995 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
996 NotCastExpr, isTypeCast);
1000 case tok::char_constant: // constant: character-constant
1001 case tok::wide_char_constant:
1002 case tok::utf8_char_constant:
1003 case tok::utf16_char_constant:
1004 case tok::utf32_char_constant:
1005 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
1008 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
1009 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
1010 case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS]
1011 case tok::kw___FUNCSIG__: // primary-expression: __FUNCSIG__ [MS]
1012 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
1013 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
1014 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
1017 case tok::string_literal: // primary-expression: string-literal
1018 case tok::wide_string_literal:
1019 case tok::utf8_string_literal:
1020 case tok::utf16_string_literal:
1021 case tok::utf32_string_literal:
1022 Res = ParseStringLiteralExpression(true);
1024 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
1025 Res = ParseGenericSelectionExpression();
1027 case tok::kw___builtin_available:
1028 return ParseAvailabilityCheckExpr(Tok.getLocation());
1029 case tok::kw___builtin_va_arg:
1030 case tok::kw___builtin_offsetof:
1031 case tok::kw___builtin_choose_expr:
1032 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
1033 case tok::kw___builtin_convertvector:
1034 return ParseBuiltinPrimaryExpression();
1035 case tok::kw___null:
1036 return Actions.ActOnGNUNullExpr(ConsumeToken());
1038 case tok::plusplus: // unary-expression: '++' unary-expression [C99]
1039 case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
1040 // C++ [expr.unary] has:
1041 // unary-expression:
1042 // ++ cast-expression
1043 // -- cast-expression
1044 Token SavedTok = Tok;
1046 // One special case is implicitly handled here: if the preceding tokens are
1047 // an ambiguous cast expression, such as "(T())++", then we recurse to
1048 // determine whether the '++' is prefix or postfix.
1049 Res = ParseCastExpression(!getLangOpts().CPlusPlus,
1050 /*isAddressOfOperand*/false, NotCastExpr,
1053 // If we return with NotCastExpr = true, we must not consume any tokens,
1054 // so put the token back where we found it.
1055 assert(Res.isInvalid());
1056 UnconsumeToken(SavedTok);
1059 if (!Res.isInvalid())
1060 Res = Actions.ActOnUnaryOp(getCurScope(), SavedTok.getLocation(),
1061 SavedKind, Res.get());
1064 case tok::amp: { // unary-expression: '&' cast-expression
1065 // Special treatment because of member pointers
1066 SourceLocation SavedLoc = ConsumeToken();
1067 Res = ParseCastExpression(false, true);
1068 if (!Res.isInvalid())
1069 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1073 case tok::star: // unary-expression: '*' cast-expression
1074 case tok::plus: // unary-expression: '+' cast-expression
1075 case tok::minus: // unary-expression: '-' cast-expression
1076 case tok::tilde: // unary-expression: '~' cast-expression
1077 case tok::exclaim: // unary-expression: '!' cast-expression
1078 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
1079 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
1080 SourceLocation SavedLoc = ConsumeToken();
1081 Res = ParseCastExpression(false);
1082 if (!Res.isInvalid())
1083 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1087 case tok::kw_co_await: { // unary-expression: 'co_await' cast-expression
1088 SourceLocation CoawaitLoc = ConsumeToken();
1089 Res = ParseCastExpression(false);
1090 if (!Res.isInvalid())
1091 Res = Actions.ActOnCoawaitExpr(getCurScope(), CoawaitLoc, Res.get());
1095 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
1096 // __extension__ silences extension warnings in the subexpression.
1097 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1098 SourceLocation SavedLoc = ConsumeToken();
1099 Res = ParseCastExpression(false);
1100 if (!Res.isInvalid())
1101 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1104 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
1105 if (!getLangOpts().C11)
1106 Diag(Tok, diag::ext_c11_alignment) << Tok.getName();
1108 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
1109 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
1110 // unary-expression: '__alignof' '(' type-name ')'
1111 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
1112 // unary-expression: 'sizeof' '(' type-name ')'
1113 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
1114 // unary-expression: '__builtin_omp_required_simd_align' '(' type-name ')'
1115 case tok::kw___builtin_omp_required_simd_align:
1116 return ParseUnaryExprOrTypeTraitExpression();
1117 case tok::ampamp: { // unary-expression: '&&' identifier
1118 SourceLocation AmpAmpLoc = ConsumeToken();
1119 if (Tok.isNot(tok::identifier))
1120 return ExprError(Diag(Tok, diag::err_expected) << tok::identifier);
1122 if (getCurScope()->getFnParent() == nullptr)
1123 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
1125 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
1126 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
1128 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
1132 case tok::kw_const_cast:
1133 case tok::kw_dynamic_cast:
1134 case tok::kw_reinterpret_cast:
1135 case tok::kw_static_cast:
1136 Res = ParseCXXCasts();
1138 case tok::kw_typeid:
1139 Res = ParseCXXTypeid();
1141 case tok::kw___uuidof:
1142 Res = ParseCXXUuidof();
1145 Res = ParseCXXThis();
1148 case tok::annot_typename:
1149 if (isStartOfObjCClassMessageMissingOpenBracket()) {
1150 ParsedType Type = getTypeAnnotation(Tok);
1152 // Fake up a Declarator to use with ActOnTypeName.
1153 DeclSpec DS(AttrFactory);
1154 DS.SetRangeStart(Tok.getLocation());
1155 DS.SetRangeEnd(Tok.getLastLoc());
1157 const char *PrevSpec = nullptr;
1159 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
1160 PrevSpec, DiagID, Type,
1161 Actions.getASTContext().getPrintingPolicy());
1163 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1164 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1169 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1175 case tok::annot_decltype:
1177 case tok::kw_wchar_t:
1178 case tok::kw_char16_t:
1179 case tok::kw_char32_t:
1184 case tok::kw___int64:
1185 case tok::kw___int128:
1186 case tok::kw_signed:
1187 case tok::kw_unsigned:
1190 case tok::kw_double:
1191 case tok::kw___float128:
1193 case tok::kw_typename:
1194 case tok::kw_typeof:
1195 case tok::kw___vector:
1196 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
1197 #include "clang/Basic/OpenCLImageTypes.def"
1199 if (!getLangOpts().CPlusPlus) {
1200 Diag(Tok, diag::err_expected_expression);
1204 if (SavedKind == tok::kw_typename) {
1205 // postfix-expression: typename-specifier '(' expression-list[opt] ')'
1206 // typename-specifier braced-init-list
1207 if (TryAnnotateTypeOrScopeToken())
1210 if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
1211 // We are trying to parse a simple-type-specifier but might not get such
1212 // a token after error recovery.
1216 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
1217 // simple-type-specifier braced-init-list
1219 DeclSpec DS(AttrFactory);
1221 ParseCXXSimpleTypeSpecifier(DS);
1222 if (Tok.isNot(tok::l_paren) &&
1223 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
1224 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
1225 << DS.getSourceRange());
1227 if (Tok.is(tok::l_brace))
1228 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1230 Res = ParseCXXTypeConstructExpression(DS);
1234 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
1235 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1236 // (We can end up in this situation after tentative parsing.)
1237 if (TryAnnotateTypeOrScopeToken())
1239 if (!Tok.is(tok::annot_cxxscope))
1240 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1241 NotCastExpr, isTypeCast);
1243 Token Next = NextToken();
1244 if (Next.is(tok::annot_template_id)) {
1245 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
1246 if (TemplateId->Kind == TNK_Type_template) {
1247 // We have a qualified template-id that we know refers to a
1248 // type, translate it into a type and continue parsing as a
1251 ParseOptionalCXXScopeSpecifier(SS, nullptr,
1252 /*EnteringContext=*/false);
1253 AnnotateTemplateIdTokenAsType();
1254 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1255 NotCastExpr, isTypeCast);
1259 // Parse as an id-expression.
1260 Res = ParseCXXIdExpression(isAddressOfOperand);
1264 case tok::annot_template_id: { // [C++] template-id
1265 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1266 if (TemplateId->Kind == TNK_Type_template) {
1267 // We have a template-id that we know refers to a type,
1268 // translate it into a type and continue parsing as a cast
1270 AnnotateTemplateIdTokenAsType();
1271 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1272 NotCastExpr, isTypeCast);
1275 // Fall through to treat the template-id as an id-expression.
1278 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
1279 Res = ParseCXXIdExpression(isAddressOfOperand);
1282 case tok::coloncolon: {
1283 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
1284 // annotates the token, tail recurse.
1285 if (TryAnnotateTypeOrScopeToken())
1287 if (!Tok.is(tok::coloncolon))
1288 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
1290 // ::new -> [C++] new-expression
1291 // ::delete -> [C++] delete-expression
1292 SourceLocation CCLoc = ConsumeToken();
1293 if (Tok.is(tok::kw_new))
1294 return ParseCXXNewExpression(true, CCLoc);
1295 if (Tok.is(tok::kw_delete))
1296 return ParseCXXDeleteExpression(true, CCLoc);
1298 // This is not a type name or scope specifier, it is an invalid expression.
1299 Diag(CCLoc, diag::err_expected_expression);
1303 case tok::kw_new: // [C++] new-expression
1304 return ParseCXXNewExpression(false, Tok.getLocation());
1306 case tok::kw_delete: // [C++] delete-expression
1307 return ParseCXXDeleteExpression(false, Tok.getLocation());
1309 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
1310 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
1311 SourceLocation KeyLoc = ConsumeToken();
1312 BalancedDelimiterTracker T(*this, tok::l_paren);
1314 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
1316 // C++11 [expr.unary.noexcept]p1:
1317 // The noexcept operator determines whether the evaluation of its operand,
1318 // which is an unevaluated operand, can throw an exception.
1319 EnterExpressionEvaluationContext Unevaluated(
1320 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
1321 ExprResult Result = ParseExpression();
1325 if (!Result.isInvalid())
1326 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
1327 Result.get(), T.getCloseLocation());
1331 #define TYPE_TRAIT(N,Spelling,K) \
1332 case tok::kw_##Spelling:
1333 #include "clang/Basic/TokenKinds.def"
1334 return ParseTypeTrait();
1336 case tok::kw___array_rank:
1337 case tok::kw___array_extent:
1338 return ParseArrayTypeTrait();
1340 case tok::kw___is_lvalue_expr:
1341 case tok::kw___is_rvalue_expr:
1342 return ParseExpressionTrait();
1345 SourceLocation AtLoc = ConsumeToken();
1346 return ParseObjCAtExpression(AtLoc);
1349 Res = ParseBlockLiteralExpression();
1351 case tok::code_completion: {
1352 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
1357 if (getLangOpts().CPlusPlus11) {
1358 if (getLangOpts().ObjC1) {
1359 // C++11 lambda expressions and Objective-C message sends both start with a
1360 // square bracket. There are three possibilities here:
1361 // we have a valid lambda expression, we have an invalid lambda
1362 // expression, or we have something that doesn't appear to be a lambda.
1363 // If we're in the last case, we fall back to ParseObjCMessageExpression.
1364 Res = TryParseLambdaExpression();
1365 if (!Res.isInvalid() && !Res.get())
1366 Res = ParseObjCMessageExpression();
1369 Res = ParseLambdaExpression();
1372 if (getLangOpts().ObjC1) {
1373 Res = ParseObjCMessageExpression();
1382 // Check to see whether Res is a function designator only. If it is and we
1383 // are compiling for OpenCL, we need to return an error as this implies
1384 // that the address of the function is being taken, which is illegal in CL.
1386 // These can be followed by postfix-expr pieces.
1387 Res = ParsePostfixExpressionSuffix(Res);
1388 if (getLangOpts().OpenCL)
1389 if (Expr *PostfixExpr = Res.get()) {
1390 QualType Ty = PostfixExpr->getType();
1391 if (!Ty.isNull() && Ty->isFunctionType()) {
1392 Diag(PostfixExpr->getExprLoc(),
1393 diag::err_opencl_taking_function_address_parser);
1401 /// \brief Once the leading part of a postfix-expression is parsed, this
1402 /// method parses any suffixes that apply.
1405 /// postfix-expression: [C99 6.5.2]
1406 /// primary-expression
1407 /// postfix-expression '[' expression ']'
1408 /// postfix-expression '[' braced-init-list ']'
1409 /// postfix-expression '(' argument-expression-list[opt] ')'
1410 /// postfix-expression '.' identifier
1411 /// postfix-expression '->' identifier
1412 /// postfix-expression '++'
1413 /// postfix-expression '--'
1414 /// '(' type-name ')' '{' initializer-list '}'
1415 /// '(' type-name ')' '{' initializer-list ',' '}'
1417 /// argument-expression-list: [C99 6.5.2]
1418 /// argument-expression ...[opt]
1419 /// argument-expression-list ',' assignment-expression ...[opt]
1422 Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
1423 // Now that the primary-expression piece of the postfix-expression has been
1424 // parsed, see if there are any postfix-expression pieces here.
1427 switch (Tok.getKind()) {
1428 case tok::code_completion:
1429 if (InMessageExpression)
1432 Actions.CodeCompletePostfixExpression(getCurScope(), LHS);
1436 case tok::identifier:
1437 // If we see identifier: after an expression, and we're not already in a
1438 // message send, then this is probably a message send with a missing
1439 // opening bracket '['.
1440 if (getLangOpts().ObjC1 && !InMessageExpression &&
1441 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
1442 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1443 nullptr, LHS.get());
1447 // Fall through; this isn't a message send.
1449 default: // Not a postfix-expression suffix.
1451 case tok::l_square: { // postfix-expression: p-e '[' expression ']'
1452 // If we have a array postfix expression that starts on a new line and
1453 // Objective-C is enabled, it is highly likely that the user forgot a
1454 // semicolon after the base expression and that the array postfix-expr is
1455 // actually another message send. In this case, do some look-ahead to see
1456 // if the contents of the square brackets are obviously not a valid
1457 // expression and recover by pretending there is no suffix.
1458 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
1459 isSimpleObjCMessageExpression())
1462 // Reject array indices starting with a lambda-expression. '[[' is
1463 // reserved for attributes.
1464 if (CheckProhibitedCXX11Attribute()) {
1465 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1469 BalancedDelimiterTracker T(*this, tok::l_square);
1471 Loc = T.getOpenLocation();
1472 ExprResult Idx, Length;
1473 SourceLocation ColonLoc;
1474 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1475 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1476 Idx = ParseBraceInitializer();
1477 } else if (getLangOpts().OpenMP) {
1478 ColonProtectionRAIIObject RAII(*this);
1479 // Parse [: or [ expr or [ expr :
1480 if (!Tok.is(tok::colon)) {
1482 Idx = ParseExpression();
1484 if (Tok.is(tok::colon)) {
1486 ColonLoc = ConsumeToken();
1487 if (Tok.isNot(tok::r_square))
1488 Length = ParseExpression();
1491 Idx = ParseExpression();
1493 SourceLocation RLoc = Tok.getLocation();
1495 ExprResult OrigLHS = LHS;
1496 if (!LHS.isInvalid() && !Idx.isInvalid() && !Length.isInvalid() &&
1497 Tok.is(tok::r_square)) {
1498 if (ColonLoc.isValid()) {
1499 LHS = Actions.ActOnOMPArraySectionExpr(LHS.get(), Loc, Idx.get(),
1500 ColonLoc, Length.get(), RLoc);
1502 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.get(), Loc,
1508 if (LHS.isInvalid()) {
1509 (void)Actions.CorrectDelayedTyposInExpr(OrigLHS);
1510 (void)Actions.CorrectDelayedTyposInExpr(Idx);
1511 (void)Actions.CorrectDelayedTyposInExpr(Length);
1521 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
1522 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
1523 // '(' argument-expression-list[opt] ')'
1524 tok::TokenKind OpKind = Tok.getKind();
1525 InMessageExpressionRAIIObject InMessage(*this, false);
1527 Expr *ExecConfig = nullptr;
1529 BalancedDelimiterTracker PT(*this, tok::l_paren);
1531 if (OpKind == tok::lesslessless) {
1532 ExprVector ExecConfigExprs;
1533 CommaLocsTy ExecConfigCommaLocs;
1534 SourceLocation OpenLoc = ConsumeToken();
1536 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
1537 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1541 SourceLocation CloseLoc;
1542 if (TryConsumeToken(tok::greatergreatergreater, CloseLoc)) {
1543 } else if (LHS.isInvalid()) {
1544 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1546 // There was an error closing the brackets
1547 Diag(Tok, diag::err_expected) << tok::greatergreatergreater;
1548 Diag(OpenLoc, diag::note_matching) << tok::lesslessless;
1549 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1553 if (!LHS.isInvalid()) {
1554 if (ExpectAndConsume(tok::l_paren))
1557 Loc = PrevTokLocation;
1560 if (!LHS.isInvalid()) {
1561 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
1565 if (ECResult.isInvalid())
1568 ExecConfig = ECResult.get();
1572 Loc = PT.getOpenLocation();
1575 ExprVector ArgExprs;
1576 CommaLocsTy CommaLocs;
1578 if (Tok.is(tok::code_completion)) {
1579 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None);
1584 if (OpKind == tok::l_paren || !LHS.isInvalid()) {
1585 if (Tok.isNot(tok::r_paren)) {
1586 if (ParseExpressionList(ArgExprs, CommaLocs, [&] {
1587 Actions.CodeCompleteCall(getCurScope(), LHS.get(), ArgExprs);
1589 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1591 } else if (LHS.isInvalid()) {
1592 for (auto &E : ArgExprs)
1593 Actions.CorrectDelayedTyposInExpr(E);
1599 if (LHS.isInvalid()) {
1600 SkipUntil(tok::r_paren, StopAtSemi);
1601 } else if (Tok.isNot(tok::r_paren)) {
1602 bool HadDelayedTypo = false;
1603 if (Actions.CorrectDelayedTyposInExpr(LHS).get() != LHS.get())
1604 HadDelayedTypo = true;
1605 for (auto &E : ArgExprs)
1606 if (Actions.CorrectDelayedTyposInExpr(E).get() != E)
1607 HadDelayedTypo = true;
1608 // If there were delayed typos in the LHS or ArgExprs, call SkipUntil
1609 // instead of PT.consumeClose() to avoid emitting extra diagnostics for
1610 // the unmatched l_paren.
1612 SkipUntil(tok::r_paren, StopAtSemi);
1617 assert((ArgExprs.size() == 0 ||
1618 ArgExprs.size()-1 == CommaLocs.size())&&
1619 "Unexpected number of commas!");
1620 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.get(), Loc,
1621 ArgExprs, Tok.getLocation(),
1630 // postfix-expression: p-e '->' template[opt] id-expression
1631 // postfix-expression: p-e '.' template[opt] id-expression
1632 tok::TokenKind OpKind = Tok.getKind();
1633 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
1636 ParsedType ObjectType;
1637 bool MayBePseudoDestructor = false;
1638 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
1639 Expr *Base = LHS.get();
1640 const Type* BaseType = Base->getType().getTypePtrOrNull();
1641 if (BaseType && Tok.is(tok::l_paren) &&
1642 (BaseType->isFunctionType() ||
1643 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
1644 Diag(OpLoc, diag::err_function_is_not_record)
1645 << OpKind << Base->getSourceRange()
1646 << FixItHint::CreateRemoval(OpLoc);
1647 return ParsePostfixExpressionSuffix(Base);
1650 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
1651 OpLoc, OpKind, ObjectType,
1652 MayBePseudoDestructor);
1653 if (LHS.isInvalid())
1656 ParseOptionalCXXScopeSpecifier(SS, ObjectType,
1657 /*EnteringContext=*/false,
1658 &MayBePseudoDestructor);
1659 if (SS.isNotEmpty())
1660 ObjectType = nullptr;
1663 if (Tok.is(tok::code_completion)) {
1664 // Code completion for a member access expression.
1665 if (Expr *Base = LHS.get())
1666 Actions.CodeCompleteMemberReferenceExpr(
1667 getCurScope(), Base, OpLoc, OpKind == tok::arrow,
1668 ExprStatementTokLoc == Base->getLocStart());
1674 if (MayBePseudoDestructor && !LHS.isInvalid()) {
1675 LHS = ParseCXXPseudoDestructor(LHS.get(), OpLoc, OpKind, SS,
1680 // Either the action has told us that this cannot be a
1681 // pseudo-destructor expression (based on the type of base
1682 // expression), or we didn't see a '~' in the right place. We
1683 // can still parse a destructor name here, but in that case it
1684 // names a real destructor.
1685 // Allow explicit constructor calls in Microsoft mode.
1686 // FIXME: Add support for explicit call of template constructor.
1687 SourceLocation TemplateKWLoc;
1689 if (getLangOpts().ObjC2 && OpKind == tok::period &&
1690 Tok.is(tok::kw_class)) {
1692 // After a '.' in a member access expression, treat the keyword
1693 // 'class' as if it were an identifier.
1695 // This hack allows property access to the 'class' method because it is
1696 // such a common method name. For other C++ keywords that are
1697 // Objective-C method names, one must use the message send syntax.
1698 IdentifierInfo *Id = Tok.getIdentifierInfo();
1699 SourceLocation Loc = ConsumeToken();
1700 Name.setIdentifier(Id, Loc);
1701 } else if (ParseUnqualifiedId(SS,
1702 /*EnteringContext=*/false,
1703 /*AllowDestructorName=*/true,
1704 /*AllowConstructorName=*/
1705 getLangOpts().MicrosoftExt,
1706 /*AllowDeductionGuide=*/false,
1707 ObjectType, TemplateKWLoc, Name)) {
1708 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1712 if (!LHS.isInvalid())
1713 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.get(), OpLoc,
1714 OpKind, SS, TemplateKWLoc, Name,
1715 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl
1719 case tok::plusplus: // postfix-expression: postfix-expression '++'
1720 case tok::minusminus: // postfix-expression: postfix-expression '--'
1721 if (!LHS.isInvalid()) {
1722 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
1723 Tok.getKind(), LHS.get());
1731 /// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
1732 /// vec_step and we are at the start of an expression or a parenthesized
1733 /// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
1734 /// expression (isCastExpr == false) or the type (isCastExpr == true).
1737 /// unary-expression: [C99 6.5.3]
1738 /// 'sizeof' unary-expression
1739 /// 'sizeof' '(' type-name ')'
1740 /// [GNU] '__alignof' unary-expression
1741 /// [GNU] '__alignof' '(' type-name ')'
1742 /// [C11] '_Alignof' '(' type-name ')'
1743 /// [C++0x] 'alignof' '(' type-id ')'
1745 /// [GNU] typeof-specifier:
1746 /// typeof ( expressions )
1747 /// typeof ( type-name )
1748 /// [GNU/C++] typeof unary-expression
1750 /// [OpenCL 1.1 6.11.12] vec_step built-in function:
1751 /// vec_step ( expressions )
1752 /// vec_step ( type-name )
1755 Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
1758 SourceRange &CastRange) {
1760 assert(OpTok.isOneOf(tok::kw_typeof, tok::kw_sizeof, tok::kw___alignof,
1761 tok::kw_alignof, tok::kw__Alignof, tok::kw_vec_step,
1762 tok::kw___builtin_omp_required_simd_align) &&
1763 "Not a typeof/sizeof/alignof/vec_step expression!");
1767 // If the operand doesn't start with an '(', it must be an expression.
1768 if (Tok.isNot(tok::l_paren)) {
1769 // If construct allows a form without parenthesis, user may forget to put
1770 // pathenthesis around type name.
1771 if (OpTok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
1772 tok::kw__Alignof)) {
1773 if (isTypeIdUnambiguously()) {
1774 DeclSpec DS(AttrFactory);
1775 ParseSpecifierQualifierList(DS);
1776 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1777 ParseDeclarator(DeclaratorInfo);
1779 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
1780 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
1781 Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
1783 << FixItHint::CreateInsertion(LParenLoc, "(")
1784 << FixItHint::CreateInsertion(RParenLoc, ")");
1791 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
1792 Diag(Tok, diag::err_expected_after) << OpTok.getIdentifierInfo()
1797 Operand = ParseCastExpression(true/*isUnaryExpression*/);
1799 // If it starts with a '(', we know that it is either a parenthesized
1800 // type-name, or it is a unary-expression that starts with a compound
1801 // literal, or starts with a primary-expression that is a parenthesized
1803 ParenParseOption ExprType = CastExpr;
1804 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
1806 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
1807 false, CastTy, RParenLoc);
1808 CastRange = SourceRange(LParenLoc, RParenLoc);
1810 // If ParseParenExpression parsed a '(typename)' sequence only, then this is
1812 if (ExprType == CastExpr) {
1817 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
1818 // GNU typeof in C requires the expression to be parenthesized. Not so for
1819 // sizeof/alignof or in C++. Therefore, the parenthesized expression is
1820 // the start of a unary-expression, but doesn't include any postfix
1821 // pieces. Parse these now if present.
1822 if (!Operand.isInvalid())
1823 Operand = ParsePostfixExpressionSuffix(Operand.get());
1827 // If we get here, the operand to the typeof/sizeof/alignof was an expresion.
1833 /// \brief Parse a sizeof or alignof expression.
1836 /// unary-expression: [C99 6.5.3]
1837 /// 'sizeof' unary-expression
1838 /// 'sizeof' '(' type-name ')'
1839 /// [C++11] 'sizeof' '...' '(' identifier ')'
1840 /// [GNU] '__alignof' unary-expression
1841 /// [GNU] '__alignof' '(' type-name ')'
1842 /// [C11] '_Alignof' '(' type-name ')'
1843 /// [C++11] 'alignof' '(' type-id ')'
1845 ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
1846 assert(Tok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
1847 tok::kw__Alignof, tok::kw_vec_step,
1848 tok::kw___builtin_omp_required_simd_align) &&
1849 "Not a sizeof/alignof/vec_step expression!");
1853 // [C++11] 'sizeof' '...' '(' identifier ')'
1854 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
1855 SourceLocation EllipsisLoc = ConsumeToken();
1856 SourceLocation LParenLoc, RParenLoc;
1857 IdentifierInfo *Name = nullptr;
1858 SourceLocation NameLoc;
1859 if (Tok.is(tok::l_paren)) {
1860 BalancedDelimiterTracker T(*this, tok::l_paren);
1862 LParenLoc = T.getOpenLocation();
1863 if (Tok.is(tok::identifier)) {
1864 Name = Tok.getIdentifierInfo();
1865 NameLoc = ConsumeToken();
1867 RParenLoc = T.getCloseLocation();
1868 if (RParenLoc.isInvalid())
1869 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1871 Diag(Tok, diag::err_expected_parameter_pack);
1872 SkipUntil(tok::r_paren, StopAtSemi);
1874 } else if (Tok.is(tok::identifier)) {
1875 Name = Tok.getIdentifierInfo();
1876 NameLoc = ConsumeToken();
1877 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
1878 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1879 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
1881 << FixItHint::CreateInsertion(LParenLoc, "(")
1882 << FixItHint::CreateInsertion(RParenLoc, ")");
1884 Diag(Tok, diag::err_sizeof_parameter_pack);
1890 EnterExpressionEvaluationContext Unevaluated(
1891 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
1892 Sema::ReuseLambdaContextDecl);
1894 return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
1895 OpTok.getLocation(),
1900 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
1901 Diag(OpTok, diag::warn_cxx98_compat_alignof);
1903 EnterExpressionEvaluationContext Unevaluated(
1904 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
1905 Sema::ReuseLambdaContextDecl);
1909 SourceRange CastRange;
1910 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
1915 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
1916 if (OpTok.isOneOf(tok::kw_alignof, tok::kw___alignof, tok::kw__Alignof))
1917 ExprKind = UETT_AlignOf;
1918 else if (OpTok.is(tok::kw_vec_step))
1919 ExprKind = UETT_VecStep;
1920 else if (OpTok.is(tok::kw___builtin_omp_required_simd_align))
1921 ExprKind = UETT_OpenMPRequiredSimdAlign;
1924 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1927 CastTy.getAsOpaquePtr(),
1930 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
1931 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
1933 // If we get here, the operand to the sizeof/alignof was an expresion.
1934 if (!Operand.isInvalid())
1935 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1943 /// ParseBuiltinPrimaryExpression
1946 /// primary-expression: [C99 6.5.1]
1947 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
1948 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
1949 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
1951 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
1952 /// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
1954 /// [GNU] offsetof-member-designator:
1955 /// [GNU] identifier
1956 /// [GNU] offsetof-member-designator '.' identifier
1957 /// [GNU] offsetof-member-designator '[' expression ']'
1959 ExprResult Parser::ParseBuiltinPrimaryExpression() {
1961 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
1963 tok::TokenKind T = Tok.getKind();
1964 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
1966 // All of these start with an open paren.
1967 if (Tok.isNot(tok::l_paren))
1968 return ExprError(Diag(Tok, diag::err_expected_after) << BuiltinII
1971 BalancedDelimiterTracker PT(*this, tok::l_paren);
1977 default: llvm_unreachable("Not a builtin primary expression!");
1978 case tok::kw___builtin_va_arg: {
1979 ExprResult Expr(ParseAssignmentExpression());
1981 if (ExpectAndConsume(tok::comma)) {
1982 SkipUntil(tok::r_paren, StopAtSemi);
1986 TypeResult Ty = ParseTypeName();
1988 if (Tok.isNot(tok::r_paren)) {
1989 Diag(Tok, diag::err_expected) << tok::r_paren;
1993 if (Expr.isInvalid() || Ty.isInvalid())
1996 Res = Actions.ActOnVAArg(StartLoc, Expr.get(), Ty.get(), ConsumeParen());
1999 case tok::kw___builtin_offsetof: {
2000 SourceLocation TypeLoc = Tok.getLocation();
2001 TypeResult Ty = ParseTypeName();
2002 if (Ty.isInvalid()) {
2003 SkipUntil(tok::r_paren, StopAtSemi);
2007 if (ExpectAndConsume(tok::comma)) {
2008 SkipUntil(tok::r_paren, StopAtSemi);
2012 // We must have at least one identifier here.
2013 if (Tok.isNot(tok::identifier)) {
2014 Diag(Tok, diag::err_expected) << tok::identifier;
2015 SkipUntil(tok::r_paren, StopAtSemi);
2019 // Keep track of the various subcomponents we see.
2020 SmallVector<Sema::OffsetOfComponent, 4> Comps;
2022 Comps.push_back(Sema::OffsetOfComponent());
2023 Comps.back().isBrackets = false;
2024 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2025 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
2027 // FIXME: This loop leaks the index expressions on error.
2029 if (Tok.is(tok::period)) {
2030 // offsetof-member-designator: offsetof-member-designator '.' identifier
2031 Comps.push_back(Sema::OffsetOfComponent());
2032 Comps.back().isBrackets = false;
2033 Comps.back().LocStart = ConsumeToken();
2035 if (Tok.isNot(tok::identifier)) {
2036 Diag(Tok, diag::err_expected) << tok::identifier;
2037 SkipUntil(tok::r_paren, StopAtSemi);
2040 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2041 Comps.back().LocEnd = ConsumeToken();
2043 } else if (Tok.is(tok::l_square)) {
2044 if (CheckProhibitedCXX11Attribute())
2047 // offsetof-member-designator: offsetof-member-design '[' expression ']'
2048 Comps.push_back(Sema::OffsetOfComponent());
2049 Comps.back().isBrackets = true;
2050 BalancedDelimiterTracker ST(*this, tok::l_square);
2052 Comps.back().LocStart = ST.getOpenLocation();
2053 Res = ParseExpression();
2054 if (Res.isInvalid()) {
2055 SkipUntil(tok::r_paren, StopAtSemi);
2058 Comps.back().U.E = Res.get();
2061 Comps.back().LocEnd = ST.getCloseLocation();
2063 if (Tok.isNot(tok::r_paren)) {
2066 } else if (Ty.isInvalid()) {
2070 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
2072 PT.getCloseLocation());
2079 case tok::kw___builtin_choose_expr: {
2080 ExprResult Cond(ParseAssignmentExpression());
2081 if (Cond.isInvalid()) {
2082 SkipUntil(tok::r_paren, StopAtSemi);
2085 if (ExpectAndConsume(tok::comma)) {
2086 SkipUntil(tok::r_paren, StopAtSemi);
2090 ExprResult Expr1(ParseAssignmentExpression());
2091 if (Expr1.isInvalid()) {
2092 SkipUntil(tok::r_paren, StopAtSemi);
2095 if (ExpectAndConsume(tok::comma)) {
2096 SkipUntil(tok::r_paren, StopAtSemi);
2100 ExprResult Expr2(ParseAssignmentExpression());
2101 if (Expr2.isInvalid()) {
2102 SkipUntil(tok::r_paren, StopAtSemi);
2105 if (Tok.isNot(tok::r_paren)) {
2106 Diag(Tok, diag::err_expected) << tok::r_paren;
2109 Res = Actions.ActOnChooseExpr(StartLoc, Cond.get(), Expr1.get(),
2110 Expr2.get(), ConsumeParen());
2113 case tok::kw___builtin_astype: {
2114 // The first argument is an expression to be converted, followed by a comma.
2115 ExprResult Expr(ParseAssignmentExpression());
2116 if (Expr.isInvalid()) {
2117 SkipUntil(tok::r_paren, StopAtSemi);
2121 if (ExpectAndConsume(tok::comma)) {
2122 SkipUntil(tok::r_paren, StopAtSemi);
2126 // Second argument is the type to bitcast to.
2127 TypeResult DestTy = ParseTypeName();
2128 if (DestTy.isInvalid())
2131 // Attempt to consume the r-paren.
2132 if (Tok.isNot(tok::r_paren)) {
2133 Diag(Tok, diag::err_expected) << tok::r_paren;
2134 SkipUntil(tok::r_paren, StopAtSemi);
2138 Res = Actions.ActOnAsTypeExpr(Expr.get(), DestTy.get(), StartLoc,
2142 case tok::kw___builtin_convertvector: {
2143 // The first argument is an expression to be converted, followed by a comma.
2144 ExprResult Expr(ParseAssignmentExpression());
2145 if (Expr.isInvalid()) {
2146 SkipUntil(tok::r_paren, StopAtSemi);
2150 if (ExpectAndConsume(tok::comma)) {
2151 SkipUntil(tok::r_paren, StopAtSemi);
2155 // Second argument is the type to bitcast to.
2156 TypeResult DestTy = ParseTypeName();
2157 if (DestTy.isInvalid())
2160 // Attempt to consume the r-paren.
2161 if (Tok.isNot(tok::r_paren)) {
2162 Diag(Tok, diag::err_expected) << tok::r_paren;
2163 SkipUntil(tok::r_paren, StopAtSemi);
2167 Res = Actions.ActOnConvertVectorExpr(Expr.get(), DestTy.get(), StartLoc,
2173 if (Res.isInvalid())
2176 // These can be followed by postfix-expr pieces because they are
2177 // primary-expressions.
2178 return ParsePostfixExpressionSuffix(Res.get());
2181 /// ParseParenExpression - This parses the unit that starts with a '(' token,
2182 /// based on what is allowed by ExprType. The actual thing parsed is returned
2183 /// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
2184 /// not the parsed cast-expression.
2187 /// primary-expression: [C99 6.5.1]
2188 /// '(' expression ')'
2189 /// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
2190 /// postfix-expression: [C99 6.5.2]
2191 /// '(' type-name ')' '{' initializer-list '}'
2192 /// '(' type-name ')' '{' initializer-list ',' '}'
2193 /// cast-expression: [C99 6.5.4]
2194 /// '(' type-name ')' cast-expression
2195 /// [ARC] bridged-cast-expression
2196 /// [ARC] bridged-cast-expression:
2197 /// (__bridge type-name) cast-expression
2198 /// (__bridge_transfer type-name) cast-expression
2199 /// (__bridge_retained type-name) cast-expression
2200 /// fold-expression: [C++1z]
2201 /// '(' cast-expression fold-operator '...' ')'
2202 /// '(' '...' fold-operator cast-expression ')'
2203 /// '(' cast-expression fold-operator '...'
2204 /// fold-operator cast-expression ')'
2207 Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
2208 bool isTypeCast, ParsedType &CastTy,
2209 SourceLocation &RParenLoc) {
2210 assert(Tok.is(tok::l_paren) && "Not a paren expr!");
2211 ColonProtectionRAIIObject ColonProtection(*this, false);
2212 BalancedDelimiterTracker T(*this, tok::l_paren);
2213 if (T.consumeOpen())
2215 SourceLocation OpenLoc = T.getOpenLocation();
2217 ExprResult Result(true);
2218 bool isAmbiguousTypeId;
2221 if (Tok.is(tok::code_completion)) {
2222 Actions.CodeCompleteOrdinaryName(getCurScope(),
2223 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression
2224 : Sema::PCC_Expression);
2229 // Diagnose use of bridge casts in non-arc mode.
2230 bool BridgeCast = (getLangOpts().ObjC2 &&
2231 Tok.isOneOf(tok::kw___bridge,
2232 tok::kw___bridge_transfer,
2233 tok::kw___bridge_retained,
2234 tok::kw___bridge_retain));
2235 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
2236 if (!TryConsumeToken(tok::kw___bridge)) {
2237 StringRef BridgeCastName = Tok.getName();
2238 SourceLocation BridgeKeywordLoc = ConsumeToken();
2239 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2240 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
2242 << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
2247 // None of these cases should fall through with an invalid Result
2248 // unless they've already reported an error.
2249 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
2250 Diag(Tok, diag::ext_gnu_statement_expr);
2252 if (!getCurScope()->getFnParent() && !getCurScope()->getBlockParent()) {
2253 Result = ExprError(Diag(OpenLoc, diag::err_stmtexpr_file_scope));
2255 // Find the nearest non-record decl context. Variables declared in a
2256 // statement expression behave as if they were declared in the enclosing
2257 // function, block, or other code construct.
2258 DeclContext *CodeDC = Actions.CurContext;
2259 while (CodeDC->isRecord() || isa<EnumDecl>(CodeDC)) {
2260 CodeDC = CodeDC->getParent();
2261 assert(CodeDC && !CodeDC->isFileContext() &&
2262 "statement expr not in code context");
2264 Sema::ContextRAII SavedContext(Actions, CodeDC, /*NewThisContext=*/false);
2266 Actions.ActOnStartStmtExpr();
2268 StmtResult Stmt(ParseCompoundStatement(true));
2269 ExprType = CompoundStmt;
2271 // If the substmt parsed correctly, build the AST node.
2272 if (!Stmt.isInvalid()) {
2273 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.get(), Tok.getLocation());
2275 Actions.ActOnStmtExprError();
2278 } else if (ExprType >= CompoundLiteral && BridgeCast) {
2279 tok::TokenKind tokenKind = Tok.getKind();
2280 SourceLocation BridgeKeywordLoc = ConsumeToken();
2282 // Parse an Objective-C ARC ownership cast expression.
2283 ObjCBridgeCastKind Kind;
2284 if (tokenKind == tok::kw___bridge)
2286 else if (tokenKind == tok::kw___bridge_transfer)
2287 Kind = OBC_BridgeTransfer;
2288 else if (tokenKind == tok::kw___bridge_retained)
2289 Kind = OBC_BridgeRetained;
2291 // As a hopefully temporary workaround, allow __bridge_retain as
2292 // a synonym for __bridge_retained, but only in system headers.
2293 assert(tokenKind == tok::kw___bridge_retain);
2294 Kind = OBC_BridgeRetained;
2295 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2296 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
2297 << FixItHint::CreateReplacement(BridgeKeywordLoc,
2298 "__bridge_retained");
2301 TypeResult Ty = ParseTypeName();
2303 ColonProtection.restore();
2304 RParenLoc = T.getCloseLocation();
2305 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false);
2307 if (Ty.isInvalid() || SubExpr.isInvalid())
2310 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
2311 BridgeKeywordLoc, Ty.get(),
2312 RParenLoc, SubExpr.get());
2313 } else if (ExprType >= CompoundLiteral &&
2314 isTypeIdInParens(isAmbiguousTypeId)) {
2316 // Otherwise, this is a compound literal expression or cast expression.
2318 // In C++, if the type-id is ambiguous we disambiguate based on context.
2319 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof
2320 // in which case we should treat it as type-id.
2321 // if stopIfCastExpr is false, we need to determine the context past the
2322 // parens, so we defer to ParseCXXAmbiguousParenExpression for that.
2323 if (isAmbiguousTypeId && !stopIfCastExpr) {
2324 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T,
2326 RParenLoc = T.getCloseLocation();
2330 // Parse the type declarator.
2331 DeclSpec DS(AttrFactory);
2332 ParseSpecifierQualifierList(DS);
2333 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
2334 ParseDeclarator(DeclaratorInfo);
2336 // If our type is followed by an identifier and either ':' or ']', then
2337 // this is probably an Objective-C message send where the leading '[' is
2338 // missing. Recover as if that were the case.
2339 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
2340 !InMessageExpression && getLangOpts().ObjC1 &&
2341 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
2344 InMessageExpressionRAIIObject InMessage(*this, false);
2345 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2347 Result = ParseObjCMessageExpressionBody(SourceLocation(),
2353 ColonProtection.restore();
2354 RParenLoc = T.getCloseLocation();
2355 if (Tok.is(tok::l_brace)) {
2356 ExprType = CompoundLiteral;
2359 InMessageExpressionRAIIObject InMessage(*this, false);
2360 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2362 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
2365 if (Tok.is(tok::l_paren)) {
2366 // This could be OpenCL vector Literals
2367 if (getLangOpts().OpenCL)
2371 InMessageExpressionRAIIObject InMessage(*this, false);
2372 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2378 QualType QT = Ty.get().get().getCanonicalType();
2379 if (QT->isVectorType())
2381 // We parsed '(' vector-type-name ')' followed by '('
2383 // Parse the cast-expression that follows it next.
2384 // isVectorLiteral = true will make sure we don't parse any
2385 // Postfix expression yet
2386 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2387 /*isAddressOfOperand=*/false,
2388 /*isTypeCast=*/IsTypeCast,
2389 /*isVectorLiteral=*/true);
2391 if (!Result.isInvalid()) {
2392 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2393 DeclaratorInfo, CastTy,
2394 RParenLoc, Result.get());
2397 // After we performed the cast we can check for postfix-expr pieces.
2398 if (!Result.isInvalid()) {
2399 Result = ParsePostfixExpressionSuffix(Result);
2407 if (ExprType == CastExpr) {
2408 // We parsed '(' type-name ')' and the thing after it wasn't a '{'.
2410 if (DeclaratorInfo.isInvalidType())
2413 // Note that this doesn't parse the subsequent cast-expression, it just
2414 // returns the parsed type to the callee.
2415 if (stopIfCastExpr) {
2418 InMessageExpressionRAIIObject InMessage(*this, false);
2419 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2422 return ExprResult();
2425 // Reject the cast of super idiom in ObjC.
2426 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 &&
2427 Tok.getIdentifierInfo() == Ident_super &&
2428 getCurScope()->isInObjcMethodScope() &&
2429 GetLookAheadToken(1).isNot(tok::period)) {
2430 Diag(Tok.getLocation(), diag::err_illegal_super_cast)
2431 << SourceRange(OpenLoc, RParenLoc);
2435 // Parse the cast-expression that follows it next.
2436 // TODO: For cast expression with CastTy.
2437 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2438 /*isAddressOfOperand=*/false,
2439 /*isTypeCast=*/IsTypeCast);
2440 if (!Result.isInvalid()) {
2441 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2442 DeclaratorInfo, CastTy,
2443 RParenLoc, Result.get());
2448 Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
2451 } else if (Tok.is(tok::ellipsis) &&
2452 isFoldOperator(NextToken().getKind())) {
2453 return ParseFoldExpression(ExprResult(), T);
2454 } else if (isTypeCast) {
2455 // Parse the expression-list.
2456 InMessageExpressionRAIIObject InMessage(*this, false);
2458 ExprVector ArgExprs;
2459 CommaLocsTy CommaLocs;
2461 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
2462 // FIXME: If we ever support comma expressions as operands to
2463 // fold-expressions, we'll need to allow multiple ArgExprs here.
2464 if (ArgExprs.size() == 1 && isFoldOperator(Tok.getKind()) &&
2465 NextToken().is(tok::ellipsis))
2466 return ParseFoldExpression(ArgExprs[0], T);
2468 ExprType = SimpleExpr;
2469 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
2473 InMessageExpressionRAIIObject InMessage(*this, false);
2475 Result = ParseExpression(MaybeTypeCast);
2476 if (!getLangOpts().CPlusPlus && MaybeTypeCast && Result.isUsable()) {
2477 // Correct typos in non-C++ code earlier so that implicit-cast-like
2478 // expressions are parsed correctly.
2479 Result = Actions.CorrectDelayedTyposInExpr(Result);
2481 ExprType = SimpleExpr;
2483 if (isFoldOperator(Tok.getKind()) && NextToken().is(tok::ellipsis))
2484 return ParseFoldExpression(Result, T);
2486 // Don't build a paren expression unless we actually match a ')'.
2487 if (!Result.isInvalid() && Tok.is(tok::r_paren))
2489 Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.get());
2493 if (Result.isInvalid()) {
2494 SkipUntil(tok::r_paren, StopAtSemi);
2499 RParenLoc = T.getCloseLocation();
2503 /// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
2504 /// and we are at the left brace.
2507 /// postfix-expression: [C99 6.5.2]
2508 /// '(' type-name ')' '{' initializer-list '}'
2509 /// '(' type-name ')' '{' initializer-list ',' '}'
2512 Parser::ParseCompoundLiteralExpression(ParsedType Ty,
2513 SourceLocation LParenLoc,
2514 SourceLocation RParenLoc) {
2515 assert(Tok.is(tok::l_brace) && "Not a compound literal!");
2516 if (!getLangOpts().C99) // Compound literals don't exist in C90.
2517 Diag(LParenLoc, diag::ext_c99_compound_literal);
2518 ExprResult Result = ParseInitializer();
2519 if (!Result.isInvalid() && Ty)
2520 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.get());
2524 /// ParseStringLiteralExpression - This handles the various token types that
2525 /// form string literals, and also handles string concatenation [C99 5.1.1.2,
2526 /// translation phase #6].
2529 /// primary-expression: [C99 6.5.1]
2532 ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
2533 assert(isTokenStringLiteral() && "Not a string literal!");
2535 // String concat. Note that keywords like __func__ and __FUNCTION__ are not
2536 // considered to be strings for concatenation purposes.
2537 SmallVector<Token, 4> StringToks;
2540 StringToks.push_back(Tok);
2541 ConsumeStringToken();
2542 } while (isTokenStringLiteral());
2544 // Pass the set of string tokens, ready for concatenation, to the actions.
2545 return Actions.ActOnStringLiteral(StringToks,
2546 AllowUserDefinedLiteral ? getCurScope()
2550 /// ParseGenericSelectionExpression - Parse a C11 generic-selection
2554 /// generic-selection:
2555 /// _Generic ( assignment-expression , generic-assoc-list )
2556 /// generic-assoc-list:
2557 /// generic-association
2558 /// generic-assoc-list , generic-association
2559 /// generic-association:
2560 /// type-name : assignment-expression
2561 /// default : assignment-expression
2563 ExprResult Parser::ParseGenericSelectionExpression() {
2564 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
2565 SourceLocation KeyLoc = ConsumeToken();
2567 if (!getLangOpts().C11)
2568 Diag(KeyLoc, diag::ext_c11_generic_selection);
2570 BalancedDelimiterTracker T(*this, tok::l_paren);
2571 if (T.expectAndConsume())
2574 ExprResult ControllingExpr;
2576 // C11 6.5.1.1p3 "The controlling expression of a generic selection is
2578 EnterExpressionEvaluationContext Unevaluated(
2579 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
2581 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
2582 if (ControllingExpr.isInvalid()) {
2583 SkipUntil(tok::r_paren, StopAtSemi);
2588 if (ExpectAndConsume(tok::comma)) {
2589 SkipUntil(tok::r_paren, StopAtSemi);
2593 SourceLocation DefaultLoc;
2598 if (Tok.is(tok::kw_default)) {
2599 // C11 6.5.1.1p2 "A generic selection shall have no more than one default
2600 // generic association."
2601 if (!DefaultLoc.isInvalid()) {
2602 Diag(Tok, diag::err_duplicate_default_assoc);
2603 Diag(DefaultLoc, diag::note_previous_default_assoc);
2604 SkipUntil(tok::r_paren, StopAtSemi);
2607 DefaultLoc = ConsumeToken();
2610 ColonProtectionRAIIObject X(*this);
2611 TypeResult TR = ParseTypeName();
2612 if (TR.isInvalid()) {
2613 SkipUntil(tok::r_paren, StopAtSemi);
2618 Types.push_back(Ty);
2620 if (ExpectAndConsume(tok::colon)) {
2621 SkipUntil(tok::r_paren, StopAtSemi);
2625 // FIXME: These expressions should be parsed in a potentially potentially
2626 // evaluated context.
2628 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
2629 if (ER.isInvalid()) {
2630 SkipUntil(tok::r_paren, StopAtSemi);
2633 Exprs.push_back(ER.get());
2634 } while (TryConsumeToken(tok::comma));
2637 if (T.getCloseLocation().isInvalid())
2640 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
2641 T.getCloseLocation(),
2642 ControllingExpr.get(),
2646 /// \brief Parse A C++1z fold-expression after the opening paren and optional
2647 /// left-hand-side expression.
2650 /// fold-expression:
2651 /// ( cast-expression fold-operator ... )
2652 /// ( ... fold-operator cast-expression )
2653 /// ( cast-expression fold-operator ... fold-operator cast-expression )
2654 ExprResult Parser::ParseFoldExpression(ExprResult LHS,
2655 BalancedDelimiterTracker &T) {
2656 if (LHS.isInvalid()) {
2661 tok::TokenKind Kind = tok::unknown;
2662 SourceLocation FirstOpLoc;
2663 if (LHS.isUsable()) {
2664 Kind = Tok.getKind();
2665 assert(isFoldOperator(Kind) && "missing fold-operator");
2666 FirstOpLoc = ConsumeToken();
2669 assert(Tok.is(tok::ellipsis) && "not a fold-expression");
2670 SourceLocation EllipsisLoc = ConsumeToken();
2673 if (Tok.isNot(tok::r_paren)) {
2674 if (!isFoldOperator(Tok.getKind()))
2675 return Diag(Tok.getLocation(), diag::err_expected_fold_operator);
2677 if (Kind != tok::unknown && Tok.getKind() != Kind)
2678 Diag(Tok.getLocation(), diag::err_fold_operator_mismatch)
2679 << SourceRange(FirstOpLoc);
2680 Kind = Tok.getKind();
2683 RHS = ParseExpression();
2684 if (RHS.isInvalid()) {
2690 Diag(EllipsisLoc, getLangOpts().CPlusPlus1z
2691 ? diag::warn_cxx14_compat_fold_expression
2692 : diag::ext_fold_expression);
2695 return Actions.ActOnCXXFoldExpr(T.getOpenLocation(), LHS.get(), Kind,
2696 EllipsisLoc, RHS.get(), T.getCloseLocation());
2699 /// ParseExpressionList - Used for C/C++ (argument-)expression-list.
2702 /// argument-expression-list:
2703 /// assignment-expression
2704 /// argument-expression-list , assignment-expression
2706 /// [C++] expression-list:
2707 /// [C++] assignment-expression
2708 /// [C++] expression-list , assignment-expression
2710 /// [C++0x] expression-list:
2711 /// [C++0x] initializer-list
2713 /// [C++0x] initializer-list
2714 /// [C++0x] initializer-clause ...[opt]
2715 /// [C++0x] initializer-list , initializer-clause ...[opt]
2717 /// [C++0x] initializer-clause:
2718 /// [C++0x] assignment-expression
2719 /// [C++0x] braced-init-list
2721 bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
2722 SmallVectorImpl<SourceLocation> &CommaLocs,
2723 std::function<void()> Completer) {
2724 bool SawError = false;
2726 if (Tok.is(tok::code_completion)) {
2730 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
2736 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
2737 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2738 Expr = ParseBraceInitializer();
2740 Expr = ParseAssignmentExpression();
2742 if (Tok.is(tok::ellipsis))
2743 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
2744 if (Expr.isInvalid()) {
2745 SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
2748 Exprs.push_back(Expr.get());
2751 if (Tok.isNot(tok::comma))
2753 // Move to the next argument, remember where the comma was.
2754 CommaLocs.push_back(ConsumeToken());
2757 // Ensure typos get diagnosed when errors were encountered while parsing the
2759 for (auto &E : Exprs) {
2760 ExprResult Expr = Actions.CorrectDelayedTyposInExpr(E);
2761 if (Expr.isUsable()) E = Expr.get();
2767 /// ParseSimpleExpressionList - A simple comma-separated list of expressions,
2768 /// used for misc language extensions.
2771 /// simple-expression-list:
2772 /// assignment-expression
2773 /// simple-expression-list , assignment-expression
2776 Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
2777 SmallVectorImpl<SourceLocation> &CommaLocs) {
2779 ExprResult Expr = ParseAssignmentExpression();
2780 if (Expr.isInvalid())
2783 Exprs.push_back(Expr.get());
2785 if (Tok.isNot(tok::comma))
2788 // Move to the next argument, remember where the comma was.
2789 CommaLocs.push_back(ConsumeToken());
2793 /// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
2796 /// [clang] block-id:
2797 /// [clang] specifier-qualifier-list block-declarator
2799 void Parser::ParseBlockId(SourceLocation CaretLoc) {
2800 if (Tok.is(tok::code_completion)) {
2801 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
2802 return cutOffParsing();
2805 // Parse the specifier-qualifier-list piece.
2806 DeclSpec DS(AttrFactory);
2807 ParseSpecifierQualifierList(DS);
2809 // Parse the block-declarator.
2810 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext);
2811 DeclaratorInfo.setFunctionDefinitionKind(FDK_Definition);
2812 ParseDeclarator(DeclaratorInfo);
2814 MaybeParseGNUAttributes(DeclaratorInfo);
2816 // Inform sema that we are starting a block.
2817 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
2820 /// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
2821 /// like ^(int x){ return x+1; }
2825 /// [clang] '^' block-args[opt] compound-statement
2826 /// [clang] '^' block-id compound-statement
2827 /// [clang] block-args:
2828 /// [clang] '(' parameter-list ')'
2830 ExprResult Parser::ParseBlockLiteralExpression() {
2831 assert(Tok.is(tok::caret) && "block literal starts with ^");
2832 SourceLocation CaretLoc = ConsumeToken();
2834 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
2835 "block literal parsing");
2837 // Enter a scope to hold everything within the block. This includes the
2838 // argument decls, decls within the compound expression, etc. This also
2839 // allows determining whether a variable reference inside the block is
2840 // within or outside of the block.
2841 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
2844 // Inform sema that we are starting a block.
2845 Actions.ActOnBlockStart(CaretLoc, getCurScope());
2847 // Parse the return type if present.
2848 DeclSpec DS(AttrFactory);
2849 Declarator ParamInfo(DS, Declarator::BlockLiteralContext);
2850 ParamInfo.setFunctionDefinitionKind(FDK_Definition);
2851 // FIXME: Since the return type isn't actually parsed, it can't be used to
2852 // fill ParamInfo with an initial valid range, so do it manually.
2853 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
2855 // If this block has arguments, parse them. There is no ambiguity here with
2856 // the expression case, because the expression case requires a parameter list.
2857 if (Tok.is(tok::l_paren)) {
2858 ParseParenDeclarator(ParamInfo);
2859 // Parse the pieces after the identifier as if we had "int(...)".
2860 // SetIdentifier sets the source range end, but in this case we're past
2862 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
2863 ParamInfo.SetIdentifier(nullptr, CaretLoc);
2864 ParamInfo.SetRangeEnd(Tmp);
2865 if (ParamInfo.isInvalidType()) {
2866 // If there was an error parsing the arguments, they may have
2867 // tried to use ^(x+y) which requires an argument list. Just
2868 // skip the whole block literal.
2869 Actions.ActOnBlockError(CaretLoc, getCurScope());
2873 MaybeParseGNUAttributes(ParamInfo);
2875 // Inform sema that we are starting a block.
2876 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2877 } else if (!Tok.is(tok::l_brace)) {
2878 ParseBlockId(CaretLoc);
2880 // Otherwise, pretend we saw (void).
2881 ParsedAttributes attrs(AttrFactory);
2882 SourceLocation NoLoc;
2883 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true,
2884 /*IsAmbiguous=*/false,
2885 /*RParenLoc=*/NoLoc,
2886 /*ArgInfo=*/nullptr,
2888 /*EllipsisLoc=*/NoLoc,
2889 /*RParenLoc=*/NoLoc,
2891 /*RefQualifierIsLvalueRef=*/true,
2892 /*RefQualifierLoc=*/NoLoc,
2893 /*ConstQualifierLoc=*/NoLoc,
2894 /*VolatileQualifierLoc=*/NoLoc,
2895 /*RestrictQualifierLoc=*/NoLoc,
2896 /*MutableLoc=*/NoLoc,
2898 /*ESpecRange=*/SourceRange(),
2899 /*Exceptions=*/nullptr,
2900 /*ExceptionRanges=*/nullptr,
2901 /*NumExceptions=*/0,
2902 /*NoexceptExpr=*/nullptr,
2903 /*ExceptionSpecTokens=*/nullptr,
2904 /*DeclsInPrototype=*/None,
2909 MaybeParseGNUAttributes(ParamInfo);
2911 // Inform sema that we are starting a block.
2912 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2916 ExprResult Result(true);
2917 if (!Tok.is(tok::l_brace)) {
2918 // Saw something like: ^expr
2919 Diag(Tok, diag::err_expected_expression);
2920 Actions.ActOnBlockError(CaretLoc, getCurScope());
2924 StmtResult Stmt(ParseCompoundStatementBody());
2926 if (!Stmt.isInvalid())
2927 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.get(), getCurScope());
2929 Actions.ActOnBlockError(CaretLoc, getCurScope());
2933 /// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
2937 ExprResult Parser::ParseObjCBoolLiteral() {
2938 tok::TokenKind Kind = Tok.getKind();
2939 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);
2942 /// Validate availability spec list, emitting diagnostics if necessary. Returns
2943 /// true if invalid.
2944 static bool CheckAvailabilitySpecList(Parser &P,
2945 ArrayRef<AvailabilitySpec> AvailSpecs) {
2946 llvm::SmallSet<StringRef, 4> Platforms;
2947 bool HasOtherPlatformSpec = false;
2949 for (const auto &Spec : AvailSpecs) {
2950 if (Spec.isOtherPlatformSpec()) {
2951 if (HasOtherPlatformSpec) {
2952 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_star);
2956 HasOtherPlatformSpec = true;
2960 bool Inserted = Platforms.insert(Spec.getPlatform()).second;
2962 // Rule out multiple version specs referring to the same platform.
2963 // For example, we emit an error for:
2964 // @available(macos 10.10, macos 10.11, *)
2965 StringRef Platform = Spec.getPlatform();
2966 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_platform)
2967 << Spec.getEndLoc() << Platform;
2972 if (!HasOtherPlatformSpec) {
2973 SourceLocation InsertWildcardLoc = AvailSpecs.back().getEndLoc();
2974 P.Diag(InsertWildcardLoc, diag::err_availability_query_wildcard_required)
2975 << FixItHint::CreateInsertion(InsertWildcardLoc, ", *");
2982 /// Parse availability query specification.
2984 /// availability-spec:
2986 /// identifier version-tuple
2987 Optional<AvailabilitySpec> Parser::ParseAvailabilitySpec() {
2988 if (Tok.is(tok::star)) {
2989 return AvailabilitySpec(ConsumeToken());
2991 // Parse the platform name.
2992 if (Tok.isNot(tok::identifier)) {
2993 Diag(Tok, diag::err_avail_query_expected_platform_name);
2997 IdentifierLoc *PlatformIdentifier = ParseIdentifierLoc();
2998 SourceRange VersionRange;
2999 VersionTuple Version = ParseVersionTuple(VersionRange);
3001 if (Version.empty())
3004 StringRef Platform = PlatformIdentifier->Ident->getName();
3006 if (AvailabilityAttr::getPrettyPlatformName(Platform).empty()) {
3007 Diag(PlatformIdentifier->Loc,
3008 diag::err_avail_query_unrecognized_platform_name)
3013 return AvailabilitySpec(Version, Platform, PlatformIdentifier->Loc,
3014 VersionRange.getEnd());
3018 ExprResult Parser::ParseAvailabilityCheckExpr(SourceLocation BeginLoc) {
3019 assert(Tok.is(tok::kw___builtin_available) ||
3020 Tok.isObjCAtKeyword(tok::objc_available));
3022 // Eat the available or __builtin_available.
3025 BalancedDelimiterTracker Parens(*this, tok::l_paren);
3026 if (Parens.expectAndConsume())
3029 SmallVector<AvailabilitySpec, 4> AvailSpecs;
3030 bool HasError = false;
3032 Optional<AvailabilitySpec> Spec = ParseAvailabilitySpec();
3036 AvailSpecs.push_back(*Spec);
3038 if (!TryConsumeToken(tok::comma))
3043 SkipUntil(tok::r_paren, StopAtSemi);
3047 CheckAvailabilitySpecList(*this, AvailSpecs);
3049 if (Parens.consumeClose())
3052 return Actions.ActOnObjCAvailabilityCheckExpr(AvailSpecs, BeginLoc,
3053 Parens.getCloseLocation());