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 "RAIIObjectsForParser.h"
26 #include "clang/Basic/PrettyStackTrace.h"
27 #include "clang/Sema/DeclSpec.h"
28 #include "clang/Sema/ParsedTemplate.h"
29 #include "clang/Sema/Scope.h"
30 #include "clang/Sema/TypoCorrection.h"
31 #include "llvm/ADT/SmallString.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();
166 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false,
167 /*isAddressOfOperand=*/false,
169 return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
172 /// \brief Parse an assignment expression where part of an Objective-C message
173 /// send has already been parsed.
175 /// In this case \p LBracLoc indicates the location of the '[' of the message
176 /// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
177 /// the receiver of the message.
179 /// Since this handles full assignment-expression's, it handles postfix
180 /// expressions and other binary operators for these expressions as well.
182 Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
183 SourceLocation SuperLoc,
184 ParsedType ReceiverType,
185 Expr *ReceiverExpr) {
187 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
188 ReceiverType, ReceiverExpr);
189 R = ParsePostfixExpressionSuffix(R);
190 return ParseRHSOfBinaryExpression(R, prec::Assignment);
194 ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
195 // C++03 [basic.def.odr]p2:
196 // An expression is potentially evaluated unless it appears where an
197 // integral constant expression is required (see 5.19) [...].
198 // C++98 and C++11 have no such rule, but this is only a defect in C++98.
199 EnterExpressionEvaluationContext Unevaluated(Actions,
200 Sema::ConstantEvaluated);
202 ExprResult LHS(ParseCastExpression(false, false, isTypeCast));
203 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
204 return Actions.ActOnConstantExpression(Res);
207 bool Parser::isNotExpressionStart() {
208 tok::TokenKind K = Tok.getKind();
209 if (K == tok::l_brace || K == tok::r_brace ||
210 K == tok::kw_for || K == tok::kw_while ||
211 K == tok::kw_if || K == tok::kw_else ||
212 K == tok::kw_goto || K == tok::kw_try)
214 // If this is a decl-specifier, we can't be at the start of an expression.
215 return isKnownToBeDeclarationSpecifier();
218 /// \brief Parse a binary expression that starts with \p LHS and has a
219 /// precedence of at least \p MinPrec.
221 Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
222 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
223 GreaterThanIsOperator,
224 getLangOpts().CPlusPlus11);
225 SourceLocation ColonLoc;
228 // If this token has a lower precedence than we are allowed to parse (e.g.
229 // because we are called recursively, or because the token is not a binop),
231 if (NextTokPrec < MinPrec)
234 // Consume the operator, saving the operator token for error reporting.
238 // Bail out when encountering a comma followed by a token which can't
239 // possibly be the start of an expression. For instance:
240 // int f() { return 1, }
241 // We can't do this before consuming the comma, because
242 // isNotExpressionStart() looks at the token stream.
243 if (OpToken.is(tok::comma) && isNotExpressionStart()) {
249 // Special case handling for the ternary operator.
250 ExprResult TernaryMiddle(true);
251 if (NextTokPrec == prec::Conditional) {
252 if (Tok.isNot(tok::colon)) {
253 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
254 ColonProtectionRAIIObject X(*this);
256 // Handle this production specially:
257 // logical-OR-expression '?' expression ':' conditional-expression
258 // In particular, the RHS of the '?' is 'expression', not
259 // 'logical-OR-expression' as we might expect.
260 TernaryMiddle = ParseExpression();
261 if (TernaryMiddle.isInvalid()) {
266 // Special case handling of "X ? Y : Z" where Y is empty:
267 // logical-OR-expression '?' ':' conditional-expression [GNU]
269 Diag(Tok, diag::ext_gnu_conditional_expr);
272 if (Tok.is(tok::colon)) {
274 ColonLoc = ConsumeToken();
276 // Otherwise, we're missing a ':'. Assume that this was a typo that
277 // the user forgot. If we're not in a macro expansion, we can suggest
278 // a fixit hint. If there were two spaces before the current token,
279 // suggest inserting the colon in between them, otherwise insert ": ".
280 SourceLocation FILoc = Tok.getLocation();
281 const char *FIText = ": ";
282 const SourceManager &SM = PP.getSourceManager();
283 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
284 assert(FILoc.isFileID());
285 bool IsInvalid = false;
286 const char *SourcePtr =
287 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
288 if (!IsInvalid && *SourcePtr == ' ') {
290 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
291 if (!IsInvalid && *SourcePtr == ' ') {
292 FILoc = FILoc.getLocWithOffset(-1);
298 Diag(Tok, diag::err_expected_colon)
299 << FixItHint::CreateInsertion(FILoc, FIText);
300 Diag(OpToken, diag::note_matching) << "?";
301 ColonLoc = Tok.getLocation();
305 // Code completion for the right-hand side of an assignment expression
306 // goes through a special hook that takes the left-hand side into account.
307 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) {
308 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get());
313 // Parse another leaf here for the RHS of the operator.
314 // ParseCastExpression works here because all RHS expressions in C have it
315 // as a prefix, at least. However, in C++, an assignment-expression could
316 // be a throw-expression, which is not a valid cast-expression.
317 // Therefore we need some special-casing here.
318 // Also note that the third operand of the conditional operator is
319 // an assignment-expression in C++, and in C++11, we can have a
320 // braced-init-list on the RHS of an assignment. For better diagnostics,
321 // parse as if we were allowed braced-init-lists everywhere, and check that
322 // they only appear on the RHS of assignments later.
324 bool RHSIsInitList = false;
325 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
326 RHS = ParseBraceInitializer();
327 RHSIsInitList = true;
328 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
329 RHS = ParseAssignmentExpression();
331 RHS = ParseCastExpression(false);
336 // Remember the precedence of this operator and get the precedence of the
337 // operator immediately to the right of the RHS.
338 prec::Level ThisPrec = NextTokPrec;
339 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
340 getLangOpts().CPlusPlus11);
342 // Assignment and conditional expressions are right-associative.
343 bool isRightAssoc = ThisPrec == prec::Conditional ||
344 ThisPrec == prec::Assignment;
346 // Get the precedence of the operator to the right of the RHS. If it binds
347 // more tightly with RHS than we do, evaluate it completely first.
348 if (ThisPrec < NextTokPrec ||
349 (ThisPrec == NextTokPrec && isRightAssoc)) {
350 if (!RHS.isInvalid() && RHSIsInitList) {
351 Diag(Tok, diag::err_init_list_bin_op)
352 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
355 // If this is left-associative, only parse things on the RHS that bind
356 // more tightly than the current operator. If it is left-associative, it
357 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as
358 // A=(B=(C=D)), where each paren is a level of recursion here.
359 // The function takes ownership of the RHS.
360 RHS = ParseRHSOfBinaryExpression(RHS,
361 static_cast<prec::Level>(ThisPrec + !isRightAssoc));
362 RHSIsInitList = false;
367 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
368 getLangOpts().CPlusPlus11);
370 assert(NextTokPrec <= ThisPrec && "Recursion didn't work!");
372 if (!RHS.isInvalid() && RHSIsInitList) {
373 if (ThisPrec == prec::Assignment) {
374 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
375 << Actions.getExprRange(RHS.get());
377 Diag(OpToken, diag::err_init_list_bin_op)
378 << /*RHS*/1 << PP.getSpelling(OpToken)
379 << Actions.getExprRange(RHS.get());
384 if (!LHS.isInvalid()) {
385 // Combine the LHS and RHS into the LHS (e.g. build AST).
386 if (TernaryMiddle.isInvalid()) {
387 // If we're using '>>' as an operator within a template
388 // argument list (in C++98), suggest the addition of
389 // parentheses so that the code remains well-formed in C++0x.
390 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
391 SuggestParentheses(OpToken.getLocation(),
392 diag::warn_cxx0x_right_shift_in_template_arg,
393 SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
394 Actions.getExprRange(RHS.get()).getEnd()));
396 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
397 OpToken.getKind(), LHS.take(), RHS.take());
399 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
400 LHS.take(), TernaryMiddle.take(),
406 /// \brief Parse a cast-expression, or, if \p isUnaryExpression is true,
407 /// parse a unary-expression.
409 /// \p isAddressOfOperand exists because an id-expression that is the
410 /// operand of address-of gets special treatment due to member pointers.
412 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
413 bool isAddressOfOperand,
414 TypeCastState isTypeCast) {
416 ExprResult Res = ParseCastExpression(isUnaryExpression,
421 Diag(Tok, diag::err_expected_expression);
426 class CastExpressionIdValidator : public CorrectionCandidateCallback {
428 CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes)
429 : AllowNonTypes(AllowNonTypes) {
430 WantTypeSpecifiers = AllowTypes;
433 virtual bool ValidateCandidate(const TypoCorrection &candidate) {
434 NamedDecl *ND = candidate.getCorrectionDecl();
436 return candidate.isKeyword();
438 if (isa<TypeDecl>(ND))
439 return WantTypeSpecifiers;
440 return AllowNonTypes;
448 /// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse
449 /// a unary-expression.
451 /// \p isAddressOfOperand exists because an id-expression that is the operand
452 /// of address-of gets special treatment due to member pointers. NotCastExpr
453 /// is set to true if the token is not the start of a cast-expression, and no
454 /// diagnostic is emitted in this case.
457 /// cast-expression: [C99 6.5.4]
459 /// '(' type-name ')' cast-expression
461 /// unary-expression: [C99 6.5.3]
462 /// postfix-expression
463 /// '++' unary-expression
464 /// '--' unary-expression
465 /// unary-operator cast-expression
466 /// 'sizeof' unary-expression
467 /// 'sizeof' '(' type-name ')'
468 /// [C++11] 'sizeof' '...' '(' identifier ')'
469 /// [GNU] '__alignof' unary-expression
470 /// [GNU] '__alignof' '(' type-name ')'
471 /// [C11] '_Alignof' '(' type-name ')'
472 /// [C++11] 'alignof' '(' type-id ')'
473 /// [GNU] '&&' identifier
474 /// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
475 /// [C++] new-expression
476 /// [C++] delete-expression
478 /// unary-operator: one of
479 /// '&' '*' '+' '-' '~' '!'
480 /// [GNU] '__extension__' '__real' '__imag'
482 /// primary-expression: [C99 6.5.1]
484 /// [C++] id-expression
487 /// [C++] boolean-literal [C++ 2.13.5]
488 /// [C++11] 'nullptr' [C++11 2.14.7]
489 /// [C++11] user-defined-literal
490 /// '(' expression ')'
491 /// [C11] generic-selection
492 /// '__func__' [C99 6.4.2.2]
493 /// [GNU] '__FUNCTION__'
494 /// [GNU] '__PRETTY_FUNCTION__'
495 /// [GNU] '(' compound-statement ')'
496 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
497 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
498 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
500 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
502 /// [OBJC] '[' objc-message-expr ']'
503 /// [OBJC] '\@selector' '(' objc-selector-arg ')'
504 /// [OBJC] '\@protocol' '(' identifier ')'
505 /// [OBJC] '\@encode' '(' type-name ')'
506 /// [OBJC] objc-string-literal
507 /// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
508 /// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
509 /// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
510 /// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
511 /// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
512 /// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
513 /// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
514 /// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
515 /// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
516 /// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
517 /// [C++] 'this' [C++ 9.3.2]
518 /// [G++] unary-type-trait '(' type-id ')'
519 /// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
520 /// [EMBT] array-type-trait '(' type-id ',' integer ')'
521 /// [clang] '^' block-literal
523 /// constant: [C99 6.4.4]
525 /// floating-constant
526 /// enumeration-constant -> identifier
527 /// character-constant
529 /// id-expression: [C++ 5.1]
533 /// unqualified-id: [C++ 5.1]
535 /// operator-function-id
536 /// conversion-function-id
540 /// new-expression: [C++ 5.3.4]
541 /// '::'[opt] 'new' new-placement[opt] new-type-id
542 /// new-initializer[opt]
543 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
544 /// new-initializer[opt]
546 /// delete-expression: [C++ 5.3.5]
547 /// '::'[opt] 'delete' cast-expression
548 /// '::'[opt] 'delete' '[' ']' cast-expression
550 /// [GNU/Embarcadero] unary-type-trait:
551 /// '__is_arithmetic'
552 /// '__is_floating_point'
554 /// '__is_lvalue_expr'
555 /// '__is_rvalue_expr'
556 /// '__is_complete_type'
561 /// '__is_lvalue_reference'
562 /// '__is_rvalue_reference'
563 /// '__is_fundamental'
568 /// '__is_member_object_pointer'
569 /// '__is_member_function_pointer'
570 /// '__is_member_pointer'
574 /// '__is_standard_layout'
578 /// [GNU] unary-type-trait:
579 /// '__has_nothrow_assign'
580 /// '__has_nothrow_copy'
581 /// '__has_nothrow_constructor'
582 /// '__has_trivial_assign' [TODO]
583 /// '__has_trivial_copy' [TODO]
584 /// '__has_trivial_constructor'
585 /// '__has_trivial_destructor'
586 /// '__has_virtual_destructor'
587 /// '__is_abstract' [TODO]
589 /// '__is_empty' [TODO]
593 /// '__is_polymorphic'
597 /// [Clang] unary-type-trait:
598 /// '__trivially_copyable'
600 /// binary-type-trait:
601 /// [GNU] '__is_base_of'
602 /// [MS] '__is_convertible_to'
603 /// '__is_convertible'
606 /// [Embarcadero] array-type-trait:
610 /// [Embarcadero] expression-trait:
611 /// '__is_lvalue_expr'
612 /// '__is_rvalue_expr'
615 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
616 bool isAddressOfOperand,
618 TypeCastState isTypeCast) {
620 tok::TokenKind SavedKind = Tok.getKind();
623 // This handles all of cast-expression, unary-expression, postfix-expression,
624 // and primary-expression. We handle them together like this for efficiency
625 // and to simplify handling of an expression starting with a '(' token: which
626 // may be one of a parenthesized expression, cast-expression, compound literal
627 // expression, or statement expression.
629 // If the parsed tokens consist of a primary-expression, the cases below
630 // break out of the switch; at the end we call ParsePostfixExpressionSuffix
631 // to handle the postfix expression suffixes. Cases that cannot be followed
632 // by postfix exprs should return without invoking
633 // ParsePostfixExpressionSuffix.
636 // If this expression is limited to being a unary-expression, the parent can
637 // not start a cast expression.
638 ParenParseOption ParenExprType =
639 (isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr;
641 SourceLocation RParenLoc;
644 // The inside of the parens don't need to be a colon protected scope, and
645 // isn't immediately a message send.
646 ColonProtectionRAIIObject X(*this, false);
648 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
649 isTypeCast == IsTypeCast, CastTy, RParenLoc);
652 switch (ParenExprType) {
653 case SimpleExpr: break; // Nothing else to do.
654 case CompoundStmt: break; // Nothing else to do.
655 case CompoundLiteral:
656 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
657 // postfix-expression exist, parse them now.
660 // We have parsed the cast-expression and no postfix-expr pieces are
668 // primary-expression
669 case tok::numeric_constant:
670 // constant: integer-constant
671 // constant: floating-constant
673 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
679 return ParseCXXBoolLiteral();
681 case tok::kw___objc_yes:
682 case tok::kw___objc_no:
683 return ParseObjCBoolLiteral();
685 case tok::kw_nullptr:
686 Diag(Tok, diag::warn_cxx98_compat_nullptr);
687 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
689 case tok::annot_primary_expr:
690 assert(Res.get() == 0 && "Stray primary-expression annotation?");
691 Res = getExprAnnotation(Tok);
695 case tok::kw_decltype:
696 // Annotate the token and tail recurse.
697 if (TryAnnotateTypeOrScopeToken())
699 assert(Tok.isNot(tok::kw_decltype));
700 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
702 case tok::identifier: { // primary-expression: identifier
703 // unqualified-id: identifier
704 // constant: enumeration-constant
705 // Turn a potentially qualified name into a annot_typename or
706 // annot_cxxscope if it would be valid. This handles things like x::y, etc.
707 if (getLangOpts().CPlusPlus) {
708 // Avoid the unnecessary parse-time lookup in the common case
709 // where the syntax forbids a type.
710 const Token &Next = NextToken();
712 // If this identifier was reverted from a token ID, and the next token
713 // is a parenthesis, this is likely to be a use of a type trait. Check
715 if (Next.is(tok::l_paren) &&
716 Tok.is(tok::identifier) &&
717 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
718 IdentifierInfo *II = Tok.getIdentifierInfo();
719 // Build up the mapping of revertable type traits, for future use.
720 if (RevertableTypeTraits.empty()) {
721 #define RTT_JOIN(X,Y) X##Y
722 #define REVERTABLE_TYPE_TRAIT(Name) \
723 RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \
724 = RTT_JOIN(tok::kw_,Name)
726 REVERTABLE_TYPE_TRAIT(__is_arithmetic);
727 REVERTABLE_TYPE_TRAIT(__is_convertible);
728 REVERTABLE_TYPE_TRAIT(__is_empty);
729 REVERTABLE_TYPE_TRAIT(__is_floating_point);
730 REVERTABLE_TYPE_TRAIT(__is_function);
731 REVERTABLE_TYPE_TRAIT(__is_fundamental);
732 REVERTABLE_TYPE_TRAIT(__is_integral);
733 REVERTABLE_TYPE_TRAIT(__is_member_function_pointer);
734 REVERTABLE_TYPE_TRAIT(__is_member_pointer);
735 REVERTABLE_TYPE_TRAIT(__is_pod);
736 REVERTABLE_TYPE_TRAIT(__is_pointer);
737 REVERTABLE_TYPE_TRAIT(__is_same);
738 REVERTABLE_TYPE_TRAIT(__is_scalar);
739 REVERTABLE_TYPE_TRAIT(__is_signed);
740 REVERTABLE_TYPE_TRAIT(__is_unsigned);
741 REVERTABLE_TYPE_TRAIT(__is_void);
742 #undef REVERTABLE_TYPE_TRAIT
746 // If we find that this is in fact the name of a type trait,
747 // update the token kind in place and parse again to treat it as
748 // the appropriate kind of type trait.
749 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
750 = RevertableTypeTraits.find(II);
751 if (Known != RevertableTypeTraits.end()) {
752 Tok.setKind(Known->second);
753 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
754 NotCastExpr, isTypeCast);
758 if (Next.is(tok::coloncolon) ||
759 (!ColonIsSacred && Next.is(tok::colon)) ||
760 Next.is(tok::less) ||
761 Next.is(tok::l_paren) ||
762 Next.is(tok::l_brace)) {
763 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
764 if (TryAnnotateTypeOrScopeToken())
766 if (!Tok.is(tok::identifier))
767 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
771 // Consume the identifier so that we can see if it is followed by a '(' or
773 IdentifierInfo &II = *Tok.getIdentifierInfo();
774 SourceLocation ILoc = ConsumeToken();
776 // Support 'Class.property' and 'super.property' notation.
777 if (getLangOpts().ObjC1 && Tok.is(tok::period) &&
778 (Actions.getTypeName(II, ILoc, getCurScope()) ||
779 // Allow the base to be 'super' if in an objc-method.
780 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
783 // Allow either an identifier or the keyword 'class' (in C++).
784 if (Tok.isNot(tok::identifier) &&
785 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
786 Diag(Tok, diag::err_expected_property_name);
789 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
790 SourceLocation PropertyLoc = ConsumeToken();
792 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
797 // In an Objective-C method, if we have "super" followed by an identifier,
798 // the token sequence is ill-formed. However, if there's a ':' or ']' after
799 // that identifier, this is probably a message send with a missing open
800 // bracket. Treat it as such.
801 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression &&
802 getCurScope()->isInObjcMethodScope() &&
803 ((Tok.is(tok::identifier) &&
804 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
805 Tok.is(tok::code_completion))) {
806 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(),
811 // If we have an Objective-C class name followed by an identifier
812 // and either ':' or ']', this is an Objective-C class message
813 // send that's missing the opening '['. Recovery
814 // appropriately. Also take this path if we're performing code
815 // completion after an Objective-C class name.
816 if (getLangOpts().ObjC1 &&
817 ((Tok.is(tok::identifier) && !InMessageExpression) ||
818 Tok.is(tok::code_completion))) {
819 const Token& Next = NextToken();
820 if (Tok.is(tok::code_completion) ||
821 Next.is(tok::colon) || Next.is(tok::r_square))
822 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
823 if (Typ.get()->isObjCObjectOrInterfaceType()) {
824 // Fake up a Declarator to use with ActOnTypeName.
825 DeclSpec DS(AttrFactory);
826 DS.SetRangeStart(ILoc);
827 DS.SetRangeEnd(ILoc);
828 const char *PrevSpec = 0;
830 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ);
832 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
833 TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
838 Res = ParseObjCMessageExpressionBody(SourceLocation(),
845 // Make sure to pass down the right value for isAddressOfOperand.
846 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
847 isAddressOfOperand = false;
849 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we
850 // need to know whether or not this identifier is a function designator or
853 CXXScopeSpec ScopeSpec;
854 SourceLocation TemplateKWLoc;
855 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast,
856 isTypeCast != IsTypeCast);
857 Name.setIdentifier(&II, ILoc);
858 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc,
859 Name, Tok.is(tok::l_paren),
860 isAddressOfOperand, &Validator);
863 case tok::char_constant: // constant: character-constant
864 case tok::wide_char_constant:
865 case tok::utf16_char_constant:
866 case tok::utf32_char_constant:
867 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
870 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
871 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
872 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
873 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
874 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
877 case tok::string_literal: // primary-expression: string-literal
878 case tok::wide_string_literal:
879 case tok::utf8_string_literal:
880 case tok::utf16_string_literal:
881 case tok::utf32_string_literal:
882 Res = ParseStringLiteralExpression(true);
884 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
885 Res = ParseGenericSelectionExpression();
887 case tok::kw___builtin_va_arg:
888 case tok::kw___builtin_offsetof:
889 case tok::kw___builtin_choose_expr:
890 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
891 return ParseBuiltinPrimaryExpression();
893 return Actions.ActOnGNUNullExpr(ConsumeToken());
895 case tok::plusplus: // unary-expression: '++' unary-expression [C99]
896 case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
897 // C++ [expr.unary] has:
899 // ++ cast-expression
900 // -- cast-expression
901 SourceLocation SavedLoc = ConsumeToken();
902 Res = ParseCastExpression(!getLangOpts().CPlusPlus);
903 if (!Res.isInvalid())
904 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
907 case tok::amp: { // unary-expression: '&' cast-expression
908 // Special treatment because of member pointers
909 SourceLocation SavedLoc = ConsumeToken();
910 Res = ParseCastExpression(false, true);
911 if (!Res.isInvalid())
912 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
916 case tok::star: // unary-expression: '*' cast-expression
917 case tok::plus: // unary-expression: '+' cast-expression
918 case tok::minus: // unary-expression: '-' cast-expression
919 case tok::tilde: // unary-expression: '~' cast-expression
920 case tok::exclaim: // unary-expression: '!' cast-expression
921 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
922 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
923 SourceLocation SavedLoc = ConsumeToken();
924 Res = ParseCastExpression(false);
925 if (!Res.isInvalid())
926 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
930 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
931 // __extension__ silences extension warnings in the subexpression.
932 ExtensionRAIIObject O(Diags); // Use RAII to do this.
933 SourceLocation SavedLoc = ConsumeToken();
934 Res = ParseCastExpression(false);
935 if (!Res.isInvalid())
936 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
939 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
940 if (!getLangOpts().C11)
941 Diag(Tok, diag::ext_c11_alignment) << Tok.getName();
943 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
944 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
945 // unary-expression: '__alignof' '(' type-name ')'
946 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
947 // unary-expression: 'sizeof' '(' type-name ')'
948 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
949 return ParseUnaryExprOrTypeTraitExpression();
950 case tok::ampamp: { // unary-expression: '&&' identifier
951 SourceLocation AmpAmpLoc = ConsumeToken();
952 if (Tok.isNot(tok::identifier))
953 return ExprError(Diag(Tok, diag::err_expected_ident));
955 if (getCurScope()->getFnParent() == 0)
956 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
958 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
959 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
961 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
965 case tok::kw_const_cast:
966 case tok::kw_dynamic_cast:
967 case tok::kw_reinterpret_cast:
968 case tok::kw_static_cast:
969 Res = ParseCXXCasts();
972 Res = ParseCXXTypeid();
974 case tok::kw___uuidof:
975 Res = ParseCXXUuidof();
978 Res = ParseCXXThis();
981 case tok::annot_typename:
982 if (isStartOfObjCClassMessageMissingOpenBracket()) {
983 ParsedType Type = getTypeAnnotation(Tok);
985 // Fake up a Declarator to use with ActOnTypeName.
986 DeclSpec DS(AttrFactory);
987 DS.SetRangeStart(Tok.getLocation());
988 DS.SetRangeEnd(Tok.getLastLoc());
990 const char *PrevSpec = 0;
992 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
993 PrevSpec, DiagID, Type);
995 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
996 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1001 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1007 case tok::annot_decltype:
1009 case tok::kw_wchar_t:
1010 case tok::kw_char16_t:
1011 case tok::kw_char32_t:
1016 case tok::kw___int64:
1017 case tok::kw___int128:
1018 case tok::kw_signed:
1019 case tok::kw_unsigned:
1022 case tok::kw_double:
1024 case tok::kw_typename:
1025 case tok::kw_typeof:
1026 case tok::kw___vector:
1027 case tok::kw_image1d_t:
1028 case tok::kw_image1d_array_t:
1029 case tok::kw_image1d_buffer_t:
1030 case tok::kw_image2d_t:
1031 case tok::kw_image2d_array_t:
1032 case tok::kw_image3d_t:
1033 case tok::kw_sampler_t:
1034 case tok::kw_event_t: {
1035 if (!getLangOpts().CPlusPlus) {
1036 Diag(Tok, diag::err_expected_expression);
1040 if (SavedKind == tok::kw_typename) {
1041 // postfix-expression: typename-specifier '(' expression-list[opt] ')'
1042 // typename-specifier braced-init-list
1043 if (TryAnnotateTypeOrScopeToken())
1047 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
1048 // simple-type-specifier braced-init-list
1050 DeclSpec DS(AttrFactory);
1051 ParseCXXSimpleTypeSpecifier(DS);
1052 if (Tok.isNot(tok::l_paren) &&
1053 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
1054 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
1055 << DS.getSourceRange());
1057 if (Tok.is(tok::l_brace))
1058 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1060 Res = ParseCXXTypeConstructExpression(DS);
1064 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
1065 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1066 // (We can end up in this situation after tentative parsing.)
1067 if (TryAnnotateTypeOrScopeToken())
1069 if (!Tok.is(tok::annot_cxxscope))
1070 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1071 NotCastExpr, isTypeCast);
1073 Token Next = NextToken();
1074 if (Next.is(tok::annot_template_id)) {
1075 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
1076 if (TemplateId->Kind == TNK_Type_template) {
1077 // We have a qualified template-id that we know refers to a
1078 // type, translate it into a type and continue parsing as a
1081 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1082 /*EnteringContext=*/false);
1083 AnnotateTemplateIdTokenAsType();
1084 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1085 NotCastExpr, isTypeCast);
1089 // Parse as an id-expression.
1090 Res = ParseCXXIdExpression(isAddressOfOperand);
1094 case tok::annot_template_id: { // [C++] template-id
1095 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1096 if (TemplateId->Kind == TNK_Type_template) {
1097 // We have a template-id that we know refers to a type,
1098 // translate it into a type and continue parsing as a cast
1100 AnnotateTemplateIdTokenAsType();
1101 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1102 NotCastExpr, isTypeCast);
1105 // Fall through to treat the template-id as an id-expression.
1108 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
1109 Res = ParseCXXIdExpression(isAddressOfOperand);
1112 case tok::coloncolon: {
1113 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
1114 // annotates the token, tail recurse.
1115 if (TryAnnotateTypeOrScopeToken())
1117 if (!Tok.is(tok::coloncolon))
1118 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
1120 // ::new -> [C++] new-expression
1121 // ::delete -> [C++] delete-expression
1122 SourceLocation CCLoc = ConsumeToken();
1123 if (Tok.is(tok::kw_new))
1124 return ParseCXXNewExpression(true, CCLoc);
1125 if (Tok.is(tok::kw_delete))
1126 return ParseCXXDeleteExpression(true, CCLoc);
1128 // This is not a type name or scope specifier, it is an invalid expression.
1129 Diag(CCLoc, diag::err_expected_expression);
1133 case tok::kw_new: // [C++] new-expression
1134 return ParseCXXNewExpression(false, Tok.getLocation());
1136 case tok::kw_delete: // [C++] delete-expression
1137 return ParseCXXDeleteExpression(false, Tok.getLocation());
1139 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
1140 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
1141 SourceLocation KeyLoc = ConsumeToken();
1142 BalancedDelimiterTracker T(*this, tok::l_paren);
1144 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
1146 // C++11 [expr.unary.noexcept]p1:
1147 // The noexcept operator determines whether the evaluation of its operand,
1148 // which is an unevaluated operand, can throw an exception.
1149 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
1150 ExprResult Result = ParseExpression();
1154 if (!Result.isInvalid())
1155 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
1156 Result.take(), T.getCloseLocation());
1160 case tok::kw___is_abstract: // [GNU] unary-type-trait
1161 case tok::kw___is_class:
1162 case tok::kw___is_empty:
1163 case tok::kw___is_enum:
1164 case tok::kw___is_interface_class:
1165 case tok::kw___is_literal:
1166 case tok::kw___is_arithmetic:
1167 case tok::kw___is_integral:
1168 case tok::kw___is_floating_point:
1169 case tok::kw___is_complete_type:
1170 case tok::kw___is_void:
1171 case tok::kw___is_array:
1172 case tok::kw___is_function:
1173 case tok::kw___is_reference:
1174 case tok::kw___is_lvalue_reference:
1175 case tok::kw___is_rvalue_reference:
1176 case tok::kw___is_fundamental:
1177 case tok::kw___is_object:
1178 case tok::kw___is_scalar:
1179 case tok::kw___is_compound:
1180 case tok::kw___is_pointer:
1181 case tok::kw___is_member_object_pointer:
1182 case tok::kw___is_member_function_pointer:
1183 case tok::kw___is_member_pointer:
1184 case tok::kw___is_const:
1185 case tok::kw___is_volatile:
1186 case tok::kw___is_standard_layout:
1187 case tok::kw___is_signed:
1188 case tok::kw___is_unsigned:
1189 case tok::kw___is_literal_type:
1190 case tok::kw___is_pod:
1191 case tok::kw___is_polymorphic:
1192 case tok::kw___is_trivial:
1193 case tok::kw___is_trivially_copyable:
1194 case tok::kw___is_union:
1195 case tok::kw___is_final:
1196 case tok::kw___has_trivial_constructor:
1197 case tok::kw___has_trivial_move_constructor:
1198 case tok::kw___has_trivial_copy:
1199 case tok::kw___has_trivial_assign:
1200 case tok::kw___has_trivial_move_assign:
1201 case tok::kw___has_trivial_destructor:
1202 case tok::kw___has_nothrow_assign:
1203 case tok::kw___has_nothrow_move_assign:
1204 case tok::kw___has_nothrow_copy:
1205 case tok::kw___has_nothrow_constructor:
1206 case tok::kw___has_virtual_destructor:
1207 return ParseUnaryTypeTrait();
1209 case tok::kw___builtin_types_compatible_p:
1210 case tok::kw___is_base_of:
1211 case tok::kw___is_same:
1212 case tok::kw___is_convertible:
1213 case tok::kw___is_convertible_to:
1214 case tok::kw___is_trivially_assignable:
1215 return ParseBinaryTypeTrait();
1217 case tok::kw___is_trivially_constructible:
1218 return ParseTypeTrait();
1220 case tok::kw___array_rank:
1221 case tok::kw___array_extent:
1222 return ParseArrayTypeTrait();
1224 case tok::kw___is_lvalue_expr:
1225 case tok::kw___is_rvalue_expr:
1226 return ParseExpressionTrait();
1229 SourceLocation AtLoc = ConsumeToken();
1230 return ParseObjCAtExpression(AtLoc);
1233 Res = ParseBlockLiteralExpression();
1235 case tok::code_completion: {
1236 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
1241 if (getLangOpts().CPlusPlus11) {
1242 if (getLangOpts().ObjC1) {
1243 // C++11 lambda expressions and Objective-C message sends both start with a
1244 // square bracket. There are three possibilities here:
1245 // we have a valid lambda expression, we have an invalid lambda
1246 // expression, or we have something that doesn't appear to be a lambda.
1247 // If we're in the last case, we fall back to ParseObjCMessageExpression.
1248 Res = TryParseLambdaExpression();
1249 if (!Res.isInvalid() && !Res.get())
1250 Res = ParseObjCMessageExpression();
1253 Res = ParseLambdaExpression();
1256 if (getLangOpts().ObjC1) {
1257 Res = ParseObjCMessageExpression();
1266 // These can be followed by postfix-expr pieces.
1267 return ParsePostfixExpressionSuffix(Res);
1270 /// \brief Once the leading part of a postfix-expression is parsed, this
1271 /// method parses any suffixes that apply.
1274 /// postfix-expression: [C99 6.5.2]
1275 /// primary-expression
1276 /// postfix-expression '[' expression ']'
1277 /// postfix-expression '[' braced-init-list ']'
1278 /// postfix-expression '(' argument-expression-list[opt] ')'
1279 /// postfix-expression '.' identifier
1280 /// postfix-expression '->' identifier
1281 /// postfix-expression '++'
1282 /// postfix-expression '--'
1283 /// '(' type-name ')' '{' initializer-list '}'
1284 /// '(' type-name ')' '{' initializer-list ',' '}'
1286 /// argument-expression-list: [C99 6.5.2]
1287 /// argument-expression ...[opt]
1288 /// argument-expression-list ',' assignment-expression ...[opt]
1291 Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
1292 // Now that the primary-expression piece of the postfix-expression has been
1293 // parsed, see if there are any postfix-expression pieces here.
1296 switch (Tok.getKind()) {
1297 case tok::code_completion:
1298 if (InMessageExpression)
1301 Actions.CodeCompletePostfixExpression(getCurScope(), LHS);
1305 case tok::identifier:
1306 // If we see identifier: after an expression, and we're not already in a
1307 // message send, then this is probably a message send with a missing
1308 // opening bracket '['.
1309 if (getLangOpts().ObjC1 && !InMessageExpression &&
1310 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
1311 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1312 ParsedType(), LHS.get());
1316 // Fall through; this isn't a message send.
1318 default: // Not a postfix-expression suffix.
1320 case tok::l_square: { // postfix-expression: p-e '[' expression ']'
1321 // If we have a array postfix expression that starts on a new line and
1322 // Objective-C is enabled, it is highly likely that the user forgot a
1323 // semicolon after the base expression and that the array postfix-expr is
1324 // actually another message send. In this case, do some look-ahead to see
1325 // if the contents of the square brackets are obviously not a valid
1326 // expression and recover by pretending there is no suffix.
1327 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
1328 isSimpleObjCMessageExpression())
1331 // Reject array indices starting with a lambda-expression. '[[' is
1332 // reserved for attributes.
1333 if (CheckProhibitedCXX11Attribute())
1336 BalancedDelimiterTracker T(*this, tok::l_square);
1338 Loc = T.getOpenLocation();
1340 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1341 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1342 Idx = ParseBraceInitializer();
1344 Idx = ParseExpression();
1346 SourceLocation RLoc = Tok.getLocation();
1348 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) {
1349 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc,
1359 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
1360 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
1361 // '(' argument-expression-list[opt] ')'
1362 tok::TokenKind OpKind = Tok.getKind();
1363 InMessageExpressionRAIIObject InMessage(*this, false);
1365 Expr *ExecConfig = 0;
1367 BalancedDelimiterTracker PT(*this, tok::l_paren);
1369 if (OpKind == tok::lesslessless) {
1370 ExprVector ExecConfigExprs;
1371 CommaLocsTy ExecConfigCommaLocs;
1372 SourceLocation OpenLoc = ConsumeToken();
1374 if (ParseExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
1378 SourceLocation CloseLoc = Tok.getLocation();
1379 if (Tok.is(tok::greatergreatergreater)) {
1381 } else if (LHS.isInvalid()) {
1382 SkipUntil(tok::greatergreatergreater);
1384 // There was an error closing the brackets
1385 Diag(Tok, diag::err_expected_ggg);
1386 Diag(OpenLoc, diag::note_matching) << "<<<";
1387 SkipUntil(tok::greatergreatergreater);
1391 if (!LHS.isInvalid()) {
1392 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, ""))
1395 Loc = PrevTokLocation;
1398 if (!LHS.isInvalid()) {
1399 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
1403 if (ECResult.isInvalid())
1406 ExecConfig = ECResult.get();
1410 Loc = PT.getOpenLocation();
1413 ExprVector ArgExprs;
1414 CommaLocsTy CommaLocs;
1416 if (Tok.is(tok::code_completion)) {
1417 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None);
1422 if (OpKind == tok::l_paren || !LHS.isInvalid()) {
1423 if (Tok.isNot(tok::r_paren)) {
1424 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall,
1432 if (LHS.isInvalid()) {
1433 SkipUntil(tok::r_paren);
1434 } else if (Tok.isNot(tok::r_paren)) {
1438 assert((ArgExprs.size() == 0 ||
1439 ArgExprs.size()-1 == CommaLocs.size())&&
1440 "Unexpected number of commas!");
1441 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc,
1442 ArgExprs, Tok.getLocation(),
1451 // postfix-expression: p-e '->' template[opt] id-expression
1452 // postfix-expression: p-e '.' template[opt] id-expression
1453 tok::TokenKind OpKind = Tok.getKind();
1454 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
1457 ParsedType ObjectType;
1458 bool MayBePseudoDestructor = false;
1459 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
1460 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), LHS.take(),
1461 OpLoc, OpKind, ObjectType,
1462 MayBePseudoDestructor);
1463 if (LHS.isInvalid())
1466 ParseOptionalCXXScopeSpecifier(SS, ObjectType,
1467 /*EnteringContext=*/false,
1468 &MayBePseudoDestructor);
1469 if (SS.isNotEmpty())
1470 ObjectType = ParsedType();
1473 if (Tok.is(tok::code_completion)) {
1474 // Code completion for a member access expression.
1475 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(),
1476 OpLoc, OpKind == tok::arrow);
1482 if (MayBePseudoDestructor && !LHS.isInvalid()) {
1483 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS,
1488 // Either the action has told is that this cannot be a
1489 // pseudo-destructor expression (based on the type of base
1490 // expression), or we didn't see a '~' in the right place. We
1491 // can still parse a destructor name here, but in that case it
1492 // names a real destructor.
1493 // Allow explicit constructor calls in Microsoft mode.
1494 // FIXME: Add support for explicit call of template constructor.
1495 SourceLocation TemplateKWLoc;
1497 if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) {
1499 // After a '.' in a member access expression, treat the keyword
1500 // 'class' as if it were an identifier.
1502 // This hack allows property access to the 'class' method because it is
1503 // such a common method name. For other C++ keywords that are
1504 // Objective-C method names, one must use the message send syntax.
1505 IdentifierInfo *Id = Tok.getIdentifierInfo();
1506 SourceLocation Loc = ConsumeToken();
1507 Name.setIdentifier(Id, Loc);
1508 } else if (ParseUnqualifiedId(SS,
1509 /*EnteringContext=*/false,
1510 /*AllowDestructorName=*/true,
1511 /*AllowConstructorName=*/
1512 getLangOpts().MicrosoftExt,
1513 ObjectType, TemplateKWLoc, Name))
1516 if (!LHS.isInvalid())
1517 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc,
1518 OpKind, SS, TemplateKWLoc, Name,
1519 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0,
1520 Tok.is(tok::l_paren));
1523 case tok::plusplus: // postfix-expression: postfix-expression '++'
1524 case tok::minusminus: // postfix-expression: postfix-expression '--'
1525 if (!LHS.isInvalid()) {
1526 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
1527 Tok.getKind(), LHS.take());
1535 /// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
1536 /// vec_step and we are at the start of an expression or a parenthesized
1537 /// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
1538 /// expression (isCastExpr == false) or the type (isCastExpr == true).
1541 /// unary-expression: [C99 6.5.3]
1542 /// 'sizeof' unary-expression
1543 /// 'sizeof' '(' type-name ')'
1544 /// [GNU] '__alignof' unary-expression
1545 /// [GNU] '__alignof' '(' type-name ')'
1546 /// [C11] '_Alignof' '(' type-name ')'
1547 /// [C++0x] 'alignof' '(' type-id ')'
1549 /// [GNU] typeof-specifier:
1550 /// typeof ( expressions )
1551 /// typeof ( type-name )
1552 /// [GNU/C++] typeof unary-expression
1554 /// [OpenCL 1.1 6.11.12] vec_step built-in function:
1555 /// vec_step ( expressions )
1556 /// vec_step ( type-name )
1559 Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
1562 SourceRange &CastRange) {
1564 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) ||
1565 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) ||
1566 OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) &&
1567 "Not a typeof/sizeof/alignof/vec_step expression!");
1571 // If the operand doesn't start with an '(', it must be an expression.
1572 if (Tok.isNot(tok::l_paren)) {
1574 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
1575 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo();
1579 Operand = ParseCastExpression(true/*isUnaryExpression*/);
1581 // If it starts with a '(', we know that it is either a parenthesized
1582 // type-name, or it is a unary-expression that starts with a compound
1583 // literal, or starts with a primary-expression that is a parenthesized
1585 ParenParseOption ExprType = CastExpr;
1586 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
1588 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
1589 false, CastTy, RParenLoc);
1590 CastRange = SourceRange(LParenLoc, RParenLoc);
1592 // If ParseParenExpression parsed a '(typename)' sequence only, then this is
1594 if (ExprType == CastExpr) {
1599 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
1600 // GNU typeof in C requires the expression to be parenthesized. Not so for
1601 // sizeof/alignof or in C++. Therefore, the parenthesized expression is
1602 // the start of a unary-expression, but doesn't include any postfix
1603 // pieces. Parse these now if present.
1604 if (!Operand.isInvalid())
1605 Operand = ParsePostfixExpressionSuffix(Operand.get());
1609 // If we get here, the operand to the typeof/sizeof/alignof was an expresion.
1615 /// \brief Parse a sizeof or alignof expression.
1618 /// unary-expression: [C99 6.5.3]
1619 /// 'sizeof' unary-expression
1620 /// 'sizeof' '(' type-name ')'
1621 /// [C++11] 'sizeof' '...' '(' identifier ')'
1622 /// [GNU] '__alignof' unary-expression
1623 /// [GNU] '__alignof' '(' type-name ')'
1624 /// [C11] '_Alignof' '(' type-name ')'
1625 /// [C++11] 'alignof' '(' type-id ')'
1627 ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
1628 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) ||
1629 Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) ||
1630 Tok.is(tok::kw_vec_step)) &&
1631 "Not a sizeof/alignof/vec_step expression!");
1635 // [C++11] 'sizeof' '...' '(' identifier ')'
1636 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
1637 SourceLocation EllipsisLoc = ConsumeToken();
1638 SourceLocation LParenLoc, RParenLoc;
1639 IdentifierInfo *Name = 0;
1640 SourceLocation NameLoc;
1641 if (Tok.is(tok::l_paren)) {
1642 BalancedDelimiterTracker T(*this, tok::l_paren);
1644 LParenLoc = T.getOpenLocation();
1645 if (Tok.is(tok::identifier)) {
1646 Name = Tok.getIdentifierInfo();
1647 NameLoc = ConsumeToken();
1649 RParenLoc = T.getCloseLocation();
1650 if (RParenLoc.isInvalid())
1651 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1653 Diag(Tok, diag::err_expected_parameter_pack);
1654 SkipUntil(tok::r_paren);
1656 } else if (Tok.is(tok::identifier)) {
1657 Name = Tok.getIdentifierInfo();
1658 NameLoc = ConsumeToken();
1659 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
1660 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1661 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
1663 << FixItHint::CreateInsertion(LParenLoc, "(")
1664 << FixItHint::CreateInsertion(RParenLoc, ")");
1666 Diag(Tok, diag::err_sizeof_parameter_pack);
1672 return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
1673 OpTok.getLocation(),
1678 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
1679 Diag(OpTok, diag::warn_cxx98_compat_alignof);
1681 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
1682 Sema::ReuseLambdaContextDecl);
1686 SourceRange CastRange;
1687 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
1692 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
1693 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) ||
1694 OpTok.is(tok::kw__Alignof))
1695 ExprKind = UETT_AlignOf;
1696 else if (OpTok.is(tok::kw_vec_step))
1697 ExprKind = UETT_VecStep;
1700 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1703 CastTy.getAsOpaquePtr(),
1706 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
1707 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
1709 // If we get here, the operand to the sizeof/alignof was an expresion.
1710 if (!Operand.isInvalid())
1711 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1719 /// ParseBuiltinPrimaryExpression
1722 /// primary-expression: [C99 6.5.1]
1723 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
1724 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
1725 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
1727 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
1728 /// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
1730 /// [GNU] offsetof-member-designator:
1731 /// [GNU] identifier
1732 /// [GNU] offsetof-member-designator '.' identifier
1733 /// [GNU] offsetof-member-designator '[' expression ']'
1735 ExprResult Parser::ParseBuiltinPrimaryExpression() {
1737 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
1739 tok::TokenKind T = Tok.getKind();
1740 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
1742 // All of these start with an open paren.
1743 if (Tok.isNot(tok::l_paren))
1744 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id)
1747 BalancedDelimiterTracker PT(*this, tok::l_paren);
1753 default: llvm_unreachable("Not a builtin primary expression!");
1754 case tok::kw___builtin_va_arg: {
1755 ExprResult Expr(ParseAssignmentExpression());
1757 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1760 TypeResult Ty = ParseTypeName();
1762 if (Tok.isNot(tok::r_paren)) {
1763 Diag(Tok, diag::err_expected_rparen);
1767 if (Expr.isInvalid() || Ty.isInvalid())
1770 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen());
1773 case tok::kw___builtin_offsetof: {
1774 SourceLocation TypeLoc = Tok.getLocation();
1775 TypeResult Ty = ParseTypeName();
1776 if (Ty.isInvalid()) {
1777 SkipUntil(tok::r_paren);
1781 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1784 // We must have at least one identifier here.
1785 if (Tok.isNot(tok::identifier)) {
1786 Diag(Tok, diag::err_expected_ident);
1787 SkipUntil(tok::r_paren);
1791 // Keep track of the various subcomponents we see.
1792 SmallVector<Sema::OffsetOfComponent, 4> Comps;
1794 Comps.push_back(Sema::OffsetOfComponent());
1795 Comps.back().isBrackets = false;
1796 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
1797 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
1799 // FIXME: This loop leaks the index expressions on error.
1801 if (Tok.is(tok::period)) {
1802 // offsetof-member-designator: offsetof-member-designator '.' identifier
1803 Comps.push_back(Sema::OffsetOfComponent());
1804 Comps.back().isBrackets = false;
1805 Comps.back().LocStart = ConsumeToken();
1807 if (Tok.isNot(tok::identifier)) {
1808 Diag(Tok, diag::err_expected_ident);
1809 SkipUntil(tok::r_paren);
1812 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
1813 Comps.back().LocEnd = ConsumeToken();
1815 } else if (Tok.is(tok::l_square)) {
1816 if (CheckProhibitedCXX11Attribute())
1819 // offsetof-member-designator: offsetof-member-design '[' expression ']'
1820 Comps.push_back(Sema::OffsetOfComponent());
1821 Comps.back().isBrackets = true;
1822 BalancedDelimiterTracker ST(*this, tok::l_square);
1824 Comps.back().LocStart = ST.getOpenLocation();
1825 Res = ParseExpression();
1826 if (Res.isInvalid()) {
1827 SkipUntil(tok::r_paren);
1830 Comps.back().U.E = Res.release();
1833 Comps.back().LocEnd = ST.getCloseLocation();
1835 if (Tok.isNot(tok::r_paren)) {
1838 } else if (Ty.isInvalid()) {
1842 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
1843 Ty.get(), &Comps[0], Comps.size(),
1844 PT.getCloseLocation());
1851 case tok::kw___builtin_choose_expr: {
1852 ExprResult Cond(ParseAssignmentExpression());
1853 if (Cond.isInvalid()) {
1854 SkipUntil(tok::r_paren);
1857 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1860 ExprResult Expr1(ParseAssignmentExpression());
1861 if (Expr1.isInvalid()) {
1862 SkipUntil(tok::r_paren);
1865 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1868 ExprResult Expr2(ParseAssignmentExpression());
1869 if (Expr2.isInvalid()) {
1870 SkipUntil(tok::r_paren);
1873 if (Tok.isNot(tok::r_paren)) {
1874 Diag(Tok, diag::err_expected_rparen);
1877 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(),
1878 Expr2.take(), ConsumeParen());
1881 case tok::kw___builtin_astype: {
1882 // The first argument is an expression to be converted, followed by a comma.
1883 ExprResult Expr(ParseAssignmentExpression());
1884 if (Expr.isInvalid()) {
1885 SkipUntil(tok::r_paren);
1889 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",
1893 // Second argument is the type to bitcast to.
1894 TypeResult DestTy = ParseTypeName();
1895 if (DestTy.isInvalid())
1898 // Attempt to consume the r-paren.
1899 if (Tok.isNot(tok::r_paren)) {
1900 Diag(Tok, diag::err_expected_rparen);
1901 SkipUntil(tok::r_paren);
1905 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc,
1911 if (Res.isInvalid())
1914 // These can be followed by postfix-expr pieces because they are
1915 // primary-expressions.
1916 return ParsePostfixExpressionSuffix(Res.take());
1919 /// ParseParenExpression - This parses the unit that starts with a '(' token,
1920 /// based on what is allowed by ExprType. The actual thing parsed is returned
1921 /// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
1922 /// not the parsed cast-expression.
1925 /// primary-expression: [C99 6.5.1]
1926 /// '(' expression ')'
1927 /// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
1928 /// postfix-expression: [C99 6.5.2]
1929 /// '(' type-name ')' '{' initializer-list '}'
1930 /// '(' type-name ')' '{' initializer-list ',' '}'
1931 /// cast-expression: [C99 6.5.4]
1932 /// '(' type-name ')' cast-expression
1933 /// [ARC] bridged-cast-expression
1935 /// [ARC] bridged-cast-expression:
1936 /// (__bridge type-name) cast-expression
1937 /// (__bridge_transfer type-name) cast-expression
1938 /// (__bridge_retained type-name) cast-expression
1941 Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
1942 bool isTypeCast, ParsedType &CastTy,
1943 SourceLocation &RParenLoc) {
1944 assert(Tok.is(tok::l_paren) && "Not a paren expr!");
1945 BalancedDelimiterTracker T(*this, tok::l_paren);
1946 if (T.consumeOpen())
1948 SourceLocation OpenLoc = T.getOpenLocation();
1950 ExprResult Result(true);
1951 bool isAmbiguousTypeId;
1952 CastTy = ParsedType();
1954 if (Tok.is(tok::code_completion)) {
1955 Actions.CodeCompleteOrdinaryName(getCurScope(),
1956 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression
1957 : Sema::PCC_Expression);
1962 // Diagnose use of bridge casts in non-arc mode.
1963 bool BridgeCast = (getLangOpts().ObjC2 &&
1964 (Tok.is(tok::kw___bridge) ||
1965 Tok.is(tok::kw___bridge_transfer) ||
1966 Tok.is(tok::kw___bridge_retained) ||
1967 Tok.is(tok::kw___bridge_retain)));
1968 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
1969 if (Tok.isNot(tok::kw___bridge)) {
1970 StringRef BridgeCastName = Tok.getName();
1971 SourceLocation BridgeKeywordLoc = ConsumeToken();
1972 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
1973 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
1975 << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
1978 ConsumeToken(); // consume __bridge
1982 // None of these cases should fall through with an invalid Result
1983 // unless they've already reported an error.
1984 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
1985 Diag(Tok, diag::ext_gnu_statement_expr);
1986 Actions.ActOnStartStmtExpr();
1988 StmtResult Stmt(ParseCompoundStatement(true));
1989 ExprType = CompoundStmt;
1991 // If the substmt parsed correctly, build the AST node.
1992 if (!Stmt.isInvalid()) {
1993 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation());
1995 Actions.ActOnStmtExprError();
1997 } else if (ExprType >= CompoundLiteral && BridgeCast) {
1998 tok::TokenKind tokenKind = Tok.getKind();
1999 SourceLocation BridgeKeywordLoc = ConsumeToken();
2001 // Parse an Objective-C ARC ownership cast expression.
2002 ObjCBridgeCastKind Kind;
2003 if (tokenKind == tok::kw___bridge)
2005 else if (tokenKind == tok::kw___bridge_transfer)
2006 Kind = OBC_BridgeTransfer;
2007 else if (tokenKind == tok::kw___bridge_retained)
2008 Kind = OBC_BridgeRetained;
2010 // As a hopefully temporary workaround, allow __bridge_retain as
2011 // a synonym for __bridge_retained, but only in system headers.
2012 assert(tokenKind == tok::kw___bridge_retain);
2013 Kind = OBC_BridgeRetained;
2014 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2015 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
2016 << FixItHint::CreateReplacement(BridgeKeywordLoc,
2017 "__bridge_retained");
2020 TypeResult Ty = ParseTypeName();
2022 RParenLoc = T.getCloseLocation();
2023 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false);
2025 if (Ty.isInvalid() || SubExpr.isInvalid())
2028 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
2029 BridgeKeywordLoc, Ty.get(),
2030 RParenLoc, SubExpr.get());
2031 } else if (ExprType >= CompoundLiteral &&
2032 isTypeIdInParens(isAmbiguousTypeId)) {
2034 // Otherwise, this is a compound literal expression or cast expression.
2036 // In C++, if the type-id is ambiguous we disambiguate based on context.
2037 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof
2038 // in which case we should treat it as type-id.
2039 // if stopIfCastExpr is false, we need to determine the context past the
2040 // parens, so we defer to ParseCXXAmbiguousParenExpression for that.
2041 if (isAmbiguousTypeId && !stopIfCastExpr) {
2042 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T);
2043 RParenLoc = T.getCloseLocation();
2047 // Parse the type declarator.
2048 DeclSpec DS(AttrFactory);
2049 ParseSpecifierQualifierList(DS);
2050 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
2051 ParseDeclarator(DeclaratorInfo);
2053 // If our type is followed by an identifier and either ':' or ']', then
2054 // this is probably an Objective-C message send where the leading '[' is
2055 // missing. Recover as if that were the case.
2056 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
2057 !InMessageExpression && getLangOpts().ObjC1 &&
2058 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
2061 InMessageExpressionRAIIObject InMessage(*this, false);
2062 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2064 Result = ParseObjCMessageExpressionBody(SourceLocation(),
2070 RParenLoc = T.getCloseLocation();
2071 if (Tok.is(tok::l_brace)) {
2072 ExprType = CompoundLiteral;
2075 InMessageExpressionRAIIObject InMessage(*this, false);
2076 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2078 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
2081 if (ExprType == CastExpr) {
2082 // We parsed '(' type-name ')' and the thing after it wasn't a '{'.
2084 if (DeclaratorInfo.isInvalidType())
2087 // Note that this doesn't parse the subsequent cast-expression, it just
2088 // returns the parsed type to the callee.
2089 if (stopIfCastExpr) {
2092 InMessageExpressionRAIIObject InMessage(*this, false);
2093 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2096 return ExprResult();
2099 // Reject the cast of super idiom in ObjC.
2100 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 &&
2101 Tok.getIdentifierInfo() == Ident_super &&
2102 getCurScope()->isInObjcMethodScope() &&
2103 GetLookAheadToken(1).isNot(tok::period)) {
2104 Diag(Tok.getLocation(), diag::err_illegal_super_cast)
2105 << SourceRange(OpenLoc, RParenLoc);
2109 // Parse the cast-expression that follows it next.
2110 // TODO: For cast expression with CastTy.
2111 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2112 /*isAddressOfOperand=*/false,
2113 /*isTypeCast=*/IsTypeCast);
2114 if (!Result.isInvalid()) {
2115 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2116 DeclaratorInfo, CastTy,
2117 RParenLoc, Result.take());
2122 Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
2125 } else if (isTypeCast) {
2126 // Parse the expression-list.
2127 InMessageExpressionRAIIObject InMessage(*this, false);
2129 ExprVector ArgExprs;
2130 CommaLocsTy CommaLocs;
2132 if (!ParseExpressionList(ArgExprs, CommaLocs)) {
2133 ExprType = SimpleExpr;
2134 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
2138 InMessageExpressionRAIIObject InMessage(*this, false);
2140 Result = ParseExpression(MaybeTypeCast);
2141 ExprType = SimpleExpr;
2143 // Don't build a paren expression unless we actually match a ')'.
2144 if (!Result.isInvalid() && Tok.is(tok::r_paren))
2145 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take());
2149 if (Result.isInvalid()) {
2150 SkipUntil(tok::r_paren);
2155 RParenLoc = T.getCloseLocation();
2159 /// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
2160 /// and we are at the left brace.
2163 /// postfix-expression: [C99 6.5.2]
2164 /// '(' type-name ')' '{' initializer-list '}'
2165 /// '(' type-name ')' '{' initializer-list ',' '}'
2168 Parser::ParseCompoundLiteralExpression(ParsedType Ty,
2169 SourceLocation LParenLoc,
2170 SourceLocation RParenLoc) {
2171 assert(Tok.is(tok::l_brace) && "Not a compound literal!");
2172 if (!getLangOpts().C99) // Compound literals don't exist in C90.
2173 Diag(LParenLoc, diag::ext_c99_compound_literal);
2174 ExprResult Result = ParseInitializer();
2175 if (!Result.isInvalid() && Ty)
2176 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take());
2180 /// ParseStringLiteralExpression - This handles the various token types that
2181 /// form string literals, and also handles string concatenation [C99 5.1.1.2,
2182 /// translation phase #6].
2185 /// primary-expression: [C99 6.5.1]
2188 ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
2189 assert(isTokenStringLiteral() && "Not a string literal!");
2191 // String concat. Note that keywords like __func__ and __FUNCTION__ are not
2192 // considered to be strings for concatenation purposes.
2193 SmallVector<Token, 4> StringToks;
2196 StringToks.push_back(Tok);
2197 ConsumeStringToken();
2198 } while (isTokenStringLiteral());
2200 // Pass the set of string tokens, ready for concatenation, to the actions.
2201 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(),
2202 AllowUserDefinedLiteral ? getCurScope() : 0);
2205 /// ParseGenericSelectionExpression - Parse a C11 generic-selection
2209 /// generic-selection:
2210 /// _Generic ( assignment-expression , generic-assoc-list )
2211 /// generic-assoc-list:
2212 /// generic-association
2213 /// generic-assoc-list , generic-association
2214 /// generic-association:
2215 /// type-name : assignment-expression
2216 /// default : assignment-expression
2218 ExprResult Parser::ParseGenericSelectionExpression() {
2219 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
2220 SourceLocation KeyLoc = ConsumeToken();
2222 if (!getLangOpts().C11)
2223 Diag(KeyLoc, diag::ext_c11_generic_selection);
2225 BalancedDelimiterTracker T(*this, tok::l_paren);
2226 if (T.expectAndConsume(diag::err_expected_lparen))
2229 ExprResult ControllingExpr;
2231 // C11 6.5.1.1p3 "The controlling expression of a generic selection is
2233 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
2234 ControllingExpr = ParseAssignmentExpression();
2235 if (ControllingExpr.isInvalid()) {
2236 SkipUntil(tok::r_paren);
2241 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) {
2242 SkipUntil(tok::r_paren);
2246 SourceLocation DefaultLoc;
2251 if (Tok.is(tok::kw_default)) {
2252 // C11 6.5.1.1p2 "A generic selection shall have no more than one default
2253 // generic association."
2254 if (!DefaultLoc.isInvalid()) {
2255 Diag(Tok, diag::err_duplicate_default_assoc);
2256 Diag(DefaultLoc, diag::note_previous_default_assoc);
2257 SkipUntil(tok::r_paren);
2260 DefaultLoc = ConsumeToken();
2263 ColonProtectionRAIIObject X(*this);
2264 TypeResult TR = ParseTypeName();
2265 if (TR.isInvalid()) {
2266 SkipUntil(tok::r_paren);
2271 Types.push_back(Ty);
2273 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) {
2274 SkipUntil(tok::r_paren);
2278 // FIXME: These expressions should be parsed in a potentially potentially
2279 // evaluated context.
2280 ExprResult ER(ParseAssignmentExpression());
2281 if (ER.isInvalid()) {
2282 SkipUntil(tok::r_paren);
2285 Exprs.push_back(ER.release());
2287 if (Tok.isNot(tok::comma))
2293 if (T.getCloseLocation().isInvalid())
2296 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
2297 T.getCloseLocation(),
2298 ControllingExpr.release(),
2302 /// ParseExpressionList - Used for C/C++ (argument-)expression-list.
2305 /// argument-expression-list:
2306 /// assignment-expression
2307 /// argument-expression-list , assignment-expression
2309 /// [C++] expression-list:
2310 /// [C++] assignment-expression
2311 /// [C++] expression-list , assignment-expression
2313 /// [C++0x] expression-list:
2314 /// [C++0x] initializer-list
2316 /// [C++0x] initializer-list
2317 /// [C++0x] initializer-clause ...[opt]
2318 /// [C++0x] initializer-list , initializer-clause ...[opt]
2320 /// [C++0x] initializer-clause:
2321 /// [C++0x] assignment-expression
2322 /// [C++0x] braced-init-list
2324 bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs,
2325 SmallVectorImpl<SourceLocation> &CommaLocs,
2326 void (Sema::*Completer)(Scope *S,
2328 ArrayRef<Expr *> Args),
2331 if (Tok.is(tok::code_completion)) {
2333 (Actions.*Completer)(getCurScope(), Data, Exprs);
2335 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
2341 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
2342 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2343 Expr = ParseBraceInitializer();
2345 Expr = ParseAssignmentExpression();
2347 if (Tok.is(tok::ellipsis))
2348 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
2349 if (Expr.isInvalid())
2352 Exprs.push_back(Expr.release());
2354 if (Tok.isNot(tok::comma))
2356 // Move to the next argument, remember where the comma was.
2357 CommaLocs.push_back(ConsumeToken());
2361 /// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
2364 /// [clang] block-id:
2365 /// [clang] specifier-qualifier-list block-declarator
2367 void Parser::ParseBlockId(SourceLocation CaretLoc) {
2368 if (Tok.is(tok::code_completion)) {
2369 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
2370 return cutOffParsing();
2373 // Parse the specifier-qualifier-list piece.
2374 DeclSpec DS(AttrFactory);
2375 ParseSpecifierQualifierList(DS);
2377 // Parse the block-declarator.
2378 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext);
2379 ParseDeclarator(DeclaratorInfo);
2381 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes.
2382 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation());
2384 MaybeParseGNUAttributes(DeclaratorInfo);
2386 // Inform sema that we are starting a block.
2387 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
2390 /// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
2391 /// like ^(int x){ return x+1; }
2395 /// [clang] '^' block-args[opt] compound-statement
2396 /// [clang] '^' block-id compound-statement
2397 /// [clang] block-args:
2398 /// [clang] '(' parameter-list ')'
2400 ExprResult Parser::ParseBlockLiteralExpression() {
2401 assert(Tok.is(tok::caret) && "block literal starts with ^");
2402 SourceLocation CaretLoc = ConsumeToken();
2404 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
2405 "block literal parsing");
2407 // Enter a scope to hold everything within the block. This includes the
2408 // argument decls, decls within the compound expression, etc. This also
2409 // allows determining whether a variable reference inside the block is
2410 // within or outside of the block.
2411 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
2414 // Inform sema that we are starting a block.
2415 Actions.ActOnBlockStart(CaretLoc, getCurScope());
2417 // Parse the return type if present.
2418 DeclSpec DS(AttrFactory);
2419 Declarator ParamInfo(DS, Declarator::BlockLiteralContext);
2420 // FIXME: Since the return type isn't actually parsed, it can't be used to
2421 // fill ParamInfo with an initial valid range, so do it manually.
2422 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
2424 // If this block has arguments, parse them. There is no ambiguity here with
2425 // the expression case, because the expression case requires a parameter list.
2426 if (Tok.is(tok::l_paren)) {
2427 ParseParenDeclarator(ParamInfo);
2428 // Parse the pieces after the identifier as if we had "int(...)".
2429 // SetIdentifier sets the source range end, but in this case we're past
2431 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
2432 ParamInfo.SetIdentifier(0, CaretLoc);
2433 ParamInfo.SetRangeEnd(Tmp);
2434 if (ParamInfo.isInvalidType()) {
2435 // If there was an error parsing the arguments, they may have
2436 // tried to use ^(x+y) which requires an argument list. Just
2437 // skip the whole block literal.
2438 Actions.ActOnBlockError(CaretLoc, getCurScope());
2442 MaybeParseGNUAttributes(ParamInfo);
2444 // Inform sema that we are starting a block.
2445 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2446 } else if (!Tok.is(tok::l_brace)) {
2447 ParseBlockId(CaretLoc);
2449 // Otherwise, pretend we saw (void).
2450 ParsedAttributes attrs(AttrFactory);
2451 SourceLocation NoLoc;
2452 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true,
2453 /*IsAmbiguous=*/false,
2454 /*RParenLoc=*/NoLoc,
2457 /*EllipsisLoc=*/NoLoc,
2458 /*RParenLoc=*/NoLoc,
2460 /*RefQualifierIsLvalueRef=*/true,
2461 /*RefQualifierLoc=*/NoLoc,
2462 /*ConstQualifierLoc=*/NoLoc,
2463 /*VolatileQualifierLoc=*/NoLoc,
2464 /*MutableLoc=*/NoLoc,
2468 /*ExceptionRanges=*/0,
2469 /*NumExceptions=*/0,
2475 MaybeParseGNUAttributes(ParamInfo);
2477 // Inform sema that we are starting a block.
2478 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2482 ExprResult Result(true);
2483 if (!Tok.is(tok::l_brace)) {
2484 // Saw something like: ^expr
2485 Diag(Tok, diag::err_expected_expression);
2486 Actions.ActOnBlockError(CaretLoc, getCurScope());
2490 StmtResult Stmt(ParseCompoundStatementBody());
2492 if (!Stmt.isInvalid())
2493 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope());
2495 Actions.ActOnBlockError(CaretLoc, getCurScope());
2499 /// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
2503 ExprResult Parser::ParseObjCBoolLiteral() {
2504 tok::TokenKind Kind = Tok.getKind();
2505 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);