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_cxx11_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 /// [MS] '__FUNCDNAME__'
495 /// [MS] 'L__FUNCTION__'
496 /// [GNU] '__PRETTY_FUNCTION__'
497 /// [GNU] '(' compound-statement ')'
498 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
499 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
500 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
502 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
504 /// [OBJC] '[' objc-message-expr ']'
505 /// [OBJC] '\@selector' '(' objc-selector-arg ')'
506 /// [OBJC] '\@protocol' '(' identifier ')'
507 /// [OBJC] '\@encode' '(' type-name ')'
508 /// [OBJC] objc-string-literal
509 /// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
510 /// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
511 /// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
512 /// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
513 /// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
514 /// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
515 /// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
516 /// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
517 /// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
518 /// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
519 /// [C++] 'this' [C++ 9.3.2]
520 /// [G++] unary-type-trait '(' type-id ')'
521 /// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
522 /// [EMBT] array-type-trait '(' type-id ',' integer ')'
523 /// [clang] '^' block-literal
525 /// constant: [C99 6.4.4]
527 /// floating-constant
528 /// enumeration-constant -> identifier
529 /// character-constant
531 /// id-expression: [C++ 5.1]
535 /// unqualified-id: [C++ 5.1]
537 /// operator-function-id
538 /// conversion-function-id
542 /// new-expression: [C++ 5.3.4]
543 /// '::'[opt] 'new' new-placement[opt] new-type-id
544 /// new-initializer[opt]
545 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
546 /// new-initializer[opt]
548 /// delete-expression: [C++ 5.3.5]
549 /// '::'[opt] 'delete' cast-expression
550 /// '::'[opt] 'delete' '[' ']' cast-expression
552 /// [GNU/Embarcadero] unary-type-trait:
553 /// '__is_arithmetic'
554 /// '__is_floating_point'
556 /// '__is_lvalue_expr'
557 /// '__is_rvalue_expr'
558 /// '__is_complete_type'
563 /// '__is_lvalue_reference'
564 /// '__is_rvalue_reference'
565 /// '__is_fundamental'
570 /// '__is_member_object_pointer'
571 /// '__is_member_function_pointer'
572 /// '__is_member_pointer'
576 /// '__is_standard_layout'
580 /// [GNU] unary-type-trait:
581 /// '__has_nothrow_assign'
582 /// '__has_nothrow_copy'
583 /// '__has_nothrow_constructor'
584 /// '__has_trivial_assign' [TODO]
585 /// '__has_trivial_copy' [TODO]
586 /// '__has_trivial_constructor'
587 /// '__has_trivial_destructor'
588 /// '__has_virtual_destructor'
589 /// '__is_abstract' [TODO]
591 /// '__is_empty' [TODO]
595 /// '__is_polymorphic'
596 /// '__is_sealed' [MS]
600 /// [Clang] unary-type-trait:
601 /// '__trivially_copyable'
603 /// binary-type-trait:
604 /// [GNU] '__is_base_of'
605 /// [MS] '__is_convertible_to'
606 /// '__is_convertible'
609 /// [Embarcadero] array-type-trait:
613 /// [Embarcadero] expression-trait:
614 /// '__is_lvalue_expr'
615 /// '__is_rvalue_expr'
618 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
619 bool isAddressOfOperand,
621 TypeCastState isTypeCast) {
623 tok::TokenKind SavedKind = Tok.getKind();
626 // This handles all of cast-expression, unary-expression, postfix-expression,
627 // and primary-expression. We handle them together like this for efficiency
628 // and to simplify handling of an expression starting with a '(' token: which
629 // may be one of a parenthesized expression, cast-expression, compound literal
630 // expression, or statement expression.
632 // If the parsed tokens consist of a primary-expression, the cases below
633 // break out of the switch; at the end we call ParsePostfixExpressionSuffix
634 // to handle the postfix expression suffixes. Cases that cannot be followed
635 // by postfix exprs should return without invoking
636 // ParsePostfixExpressionSuffix.
639 // If this expression is limited to being a unary-expression, the parent can
640 // not start a cast expression.
641 ParenParseOption ParenExprType =
642 (isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr;
644 SourceLocation RParenLoc;
647 // The inside of the parens don't need to be a colon protected scope, and
648 // isn't immediately a message send.
649 ColonProtectionRAIIObject X(*this, false);
651 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
652 isTypeCast == IsTypeCast, CastTy, RParenLoc);
655 switch (ParenExprType) {
656 case SimpleExpr: break; // Nothing else to do.
657 case CompoundStmt: break; // Nothing else to do.
658 case CompoundLiteral:
659 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
660 // postfix-expression exist, parse them now.
663 // We have parsed the cast-expression and no postfix-expr pieces are
671 // primary-expression
672 case tok::numeric_constant:
673 // constant: integer-constant
674 // constant: floating-constant
676 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
682 return ParseCXXBoolLiteral();
684 case tok::kw___objc_yes:
685 case tok::kw___objc_no:
686 return ParseObjCBoolLiteral();
688 case tok::kw_nullptr:
689 Diag(Tok, diag::warn_cxx98_compat_nullptr);
690 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
692 case tok::annot_primary_expr:
693 assert(Res.get() == 0 && "Stray primary-expression annotation?");
694 Res = getExprAnnotation(Tok);
698 case tok::kw_decltype:
699 // Annotate the token and tail recurse.
700 if (TryAnnotateTypeOrScopeToken())
702 assert(Tok.isNot(tok::kw_decltype));
703 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
705 case tok::identifier: { // primary-expression: identifier
706 // unqualified-id: identifier
707 // constant: enumeration-constant
708 // Turn a potentially qualified name into a annot_typename or
709 // annot_cxxscope if it would be valid. This handles things like x::y, etc.
710 if (getLangOpts().CPlusPlus) {
711 // Avoid the unnecessary parse-time lookup in the common case
712 // where the syntax forbids a type.
713 const Token &Next = NextToken();
715 // If this identifier was reverted from a token ID, and the next token
716 // is a parenthesis, this is likely to be a use of a type trait. Check
718 if (Next.is(tok::l_paren) &&
719 Tok.is(tok::identifier) &&
720 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
721 IdentifierInfo *II = Tok.getIdentifierInfo();
722 // Build up the mapping of revertable type traits, for future use.
723 if (RevertableTypeTraits.empty()) {
724 #define RTT_JOIN(X,Y) X##Y
725 #define REVERTABLE_TYPE_TRAIT(Name) \
726 RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \
727 = RTT_JOIN(tok::kw_,Name)
729 REVERTABLE_TYPE_TRAIT(__is_arithmetic);
730 REVERTABLE_TYPE_TRAIT(__is_convertible);
731 REVERTABLE_TYPE_TRAIT(__is_empty);
732 REVERTABLE_TYPE_TRAIT(__is_floating_point);
733 REVERTABLE_TYPE_TRAIT(__is_function);
734 REVERTABLE_TYPE_TRAIT(__is_fundamental);
735 REVERTABLE_TYPE_TRAIT(__is_integral);
736 REVERTABLE_TYPE_TRAIT(__is_member_function_pointer);
737 REVERTABLE_TYPE_TRAIT(__is_member_pointer);
738 REVERTABLE_TYPE_TRAIT(__is_pod);
739 REVERTABLE_TYPE_TRAIT(__is_pointer);
740 REVERTABLE_TYPE_TRAIT(__is_same);
741 REVERTABLE_TYPE_TRAIT(__is_scalar);
742 REVERTABLE_TYPE_TRAIT(__is_signed);
743 REVERTABLE_TYPE_TRAIT(__is_unsigned);
744 REVERTABLE_TYPE_TRAIT(__is_void);
745 #undef REVERTABLE_TYPE_TRAIT
749 // If we find that this is in fact the name of a type trait,
750 // update the token kind in place and parse again to treat it as
751 // the appropriate kind of type trait.
752 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
753 = RevertableTypeTraits.find(II);
754 if (Known != RevertableTypeTraits.end()) {
755 Tok.setKind(Known->second);
756 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
757 NotCastExpr, isTypeCast);
761 if (Next.is(tok::coloncolon) ||
762 (!ColonIsSacred && Next.is(tok::colon)) ||
763 Next.is(tok::less) ||
764 Next.is(tok::l_paren) ||
765 Next.is(tok::l_brace)) {
766 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
767 if (TryAnnotateTypeOrScopeToken())
769 if (!Tok.is(tok::identifier))
770 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
774 // Consume the identifier so that we can see if it is followed by a '(' or
776 IdentifierInfo &II = *Tok.getIdentifierInfo();
777 SourceLocation ILoc = ConsumeToken();
779 // Support 'Class.property' and 'super.property' notation.
780 if (getLangOpts().ObjC1 && Tok.is(tok::period) &&
781 (Actions.getTypeName(II, ILoc, getCurScope()) ||
782 // Allow the base to be 'super' if in an objc-method.
783 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
786 // Allow either an identifier or the keyword 'class' (in C++).
787 if (Tok.isNot(tok::identifier) &&
788 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
789 Diag(Tok, diag::err_expected_property_name);
792 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
793 SourceLocation PropertyLoc = ConsumeToken();
795 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
800 // In an Objective-C method, if we have "super" followed by an identifier,
801 // the token sequence is ill-formed. However, if there's a ':' or ']' after
802 // that identifier, this is probably a message send with a missing open
803 // bracket. Treat it as such.
804 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression &&
805 getCurScope()->isInObjcMethodScope() &&
806 ((Tok.is(tok::identifier) &&
807 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
808 Tok.is(tok::code_completion))) {
809 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(),
814 // If we have an Objective-C class name followed by an identifier
815 // and either ':' or ']', this is an Objective-C class message
816 // send that's missing the opening '['. Recovery
817 // appropriately. Also take this path if we're performing code
818 // completion after an Objective-C class name.
819 if (getLangOpts().ObjC1 &&
820 ((Tok.is(tok::identifier) && !InMessageExpression) ||
821 Tok.is(tok::code_completion))) {
822 const Token& Next = NextToken();
823 if (Tok.is(tok::code_completion) ||
824 Next.is(tok::colon) || Next.is(tok::r_square))
825 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
826 if (Typ.get()->isObjCObjectOrInterfaceType()) {
827 // Fake up a Declarator to use with ActOnTypeName.
828 DeclSpec DS(AttrFactory);
829 DS.SetRangeStart(ILoc);
830 DS.SetRangeEnd(ILoc);
831 const char *PrevSpec = 0;
833 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ);
835 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
836 TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
841 Res = ParseObjCMessageExpressionBody(SourceLocation(),
848 // Make sure to pass down the right value for isAddressOfOperand.
849 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
850 isAddressOfOperand = false;
852 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we
853 // need to know whether or not this identifier is a function designator or
856 CXXScopeSpec ScopeSpec;
857 SourceLocation TemplateKWLoc;
858 CastExpressionIdValidator Validator(isTypeCast != NotTypeCast,
859 isTypeCast != IsTypeCast);
860 Name.setIdentifier(&II, ILoc);
861 Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc,
862 Name, Tok.is(tok::l_paren),
863 isAddressOfOperand, &Validator);
866 case tok::char_constant: // constant: character-constant
867 case tok::wide_char_constant:
868 case tok::utf16_char_constant:
869 case tok::utf32_char_constant:
870 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
873 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
874 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
875 case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS]
876 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
877 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
878 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
881 case tok::string_literal: // primary-expression: string-literal
882 case tok::wide_string_literal:
883 case tok::utf8_string_literal:
884 case tok::utf16_string_literal:
885 case tok::utf32_string_literal:
886 Res = ParseStringLiteralExpression(true);
888 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
889 Res = ParseGenericSelectionExpression();
891 case tok::kw___builtin_va_arg:
892 case tok::kw___builtin_offsetof:
893 case tok::kw___builtin_choose_expr:
894 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
895 case tok::kw___builtin_convertvector:
896 return ParseBuiltinPrimaryExpression();
898 return Actions.ActOnGNUNullExpr(ConsumeToken());
900 case tok::plusplus: // unary-expression: '++' unary-expression [C99]
901 case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
902 // C++ [expr.unary] has:
904 // ++ cast-expression
905 // -- cast-expression
906 SourceLocation SavedLoc = ConsumeToken();
907 Res = ParseCastExpression(!getLangOpts().CPlusPlus);
908 if (!Res.isInvalid())
909 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
912 case tok::amp: { // unary-expression: '&' cast-expression
913 // Special treatment because of member pointers
914 SourceLocation SavedLoc = ConsumeToken();
915 Res = ParseCastExpression(false, true);
916 if (!Res.isInvalid())
917 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
921 case tok::star: // unary-expression: '*' cast-expression
922 case tok::plus: // unary-expression: '+' cast-expression
923 case tok::minus: // unary-expression: '-' cast-expression
924 case tok::tilde: // unary-expression: '~' cast-expression
925 case tok::exclaim: // unary-expression: '!' cast-expression
926 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
927 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
928 SourceLocation SavedLoc = ConsumeToken();
929 Res = ParseCastExpression(false);
930 if (!Res.isInvalid())
931 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
935 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
936 // __extension__ silences extension warnings in the subexpression.
937 ExtensionRAIIObject O(Diags); // Use RAII to do this.
938 SourceLocation SavedLoc = ConsumeToken();
939 Res = ParseCastExpression(false);
940 if (!Res.isInvalid())
941 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
944 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
945 if (!getLangOpts().C11)
946 Diag(Tok, diag::ext_c11_alignment) << Tok.getName();
948 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
949 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
950 // unary-expression: '__alignof' '(' type-name ')'
951 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
952 // unary-expression: 'sizeof' '(' type-name ')'
953 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
954 return ParseUnaryExprOrTypeTraitExpression();
955 case tok::ampamp: { // unary-expression: '&&' identifier
956 SourceLocation AmpAmpLoc = ConsumeToken();
957 if (Tok.isNot(tok::identifier))
958 return ExprError(Diag(Tok, diag::err_expected_ident));
960 if (getCurScope()->getFnParent() == 0)
961 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
963 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
964 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
966 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
970 case tok::kw_const_cast:
971 case tok::kw_dynamic_cast:
972 case tok::kw_reinterpret_cast:
973 case tok::kw_static_cast:
974 Res = ParseCXXCasts();
977 Res = ParseCXXTypeid();
979 case tok::kw___uuidof:
980 Res = ParseCXXUuidof();
983 Res = ParseCXXThis();
986 case tok::annot_typename:
987 if (isStartOfObjCClassMessageMissingOpenBracket()) {
988 ParsedType Type = getTypeAnnotation(Tok);
990 // Fake up a Declarator to use with ActOnTypeName.
991 DeclSpec DS(AttrFactory);
992 DS.SetRangeStart(Tok.getLocation());
993 DS.SetRangeEnd(Tok.getLastLoc());
995 const char *PrevSpec = 0;
997 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
998 PrevSpec, DiagID, Type);
1000 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1001 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1006 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1012 case tok::annot_decltype:
1014 case tok::kw_wchar_t:
1015 case tok::kw_char16_t:
1016 case tok::kw_char32_t:
1021 case tok::kw___int64:
1022 case tok::kw___int128:
1023 case tok::kw_signed:
1024 case tok::kw_unsigned:
1027 case tok::kw_double:
1029 case tok::kw_typename:
1030 case tok::kw_typeof:
1031 case tok::kw___vector:
1032 case tok::kw_image1d_t:
1033 case tok::kw_image1d_array_t:
1034 case tok::kw_image1d_buffer_t:
1035 case tok::kw_image2d_t:
1036 case tok::kw_image2d_array_t:
1037 case tok::kw_image3d_t:
1038 case tok::kw_sampler_t:
1039 case tok::kw_event_t: {
1040 if (!getLangOpts().CPlusPlus) {
1041 Diag(Tok, diag::err_expected_expression);
1045 if (SavedKind == tok::kw_typename) {
1046 // postfix-expression: typename-specifier '(' expression-list[opt] ')'
1047 // typename-specifier braced-init-list
1048 if (TryAnnotateTypeOrScopeToken())
1051 if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
1052 // We are trying to parse a simple-type-specifier but might not get such
1053 // a token after error recovery.
1057 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
1058 // simple-type-specifier braced-init-list
1060 DeclSpec DS(AttrFactory);
1062 ParseCXXSimpleTypeSpecifier(DS);
1063 if (Tok.isNot(tok::l_paren) &&
1064 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
1065 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
1066 << DS.getSourceRange());
1068 if (Tok.is(tok::l_brace))
1069 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1071 Res = ParseCXXTypeConstructExpression(DS);
1075 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
1076 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1077 // (We can end up in this situation after tentative parsing.)
1078 if (TryAnnotateTypeOrScopeToken())
1080 if (!Tok.is(tok::annot_cxxscope))
1081 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1082 NotCastExpr, isTypeCast);
1084 Token Next = NextToken();
1085 if (Next.is(tok::annot_template_id)) {
1086 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
1087 if (TemplateId->Kind == TNK_Type_template) {
1088 // We have a qualified template-id that we know refers to a
1089 // type, translate it into a type and continue parsing as a
1092 ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
1093 /*EnteringContext=*/false);
1094 AnnotateTemplateIdTokenAsType();
1095 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1096 NotCastExpr, isTypeCast);
1100 // Parse as an id-expression.
1101 Res = ParseCXXIdExpression(isAddressOfOperand);
1105 case tok::annot_template_id: { // [C++] template-id
1106 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1107 if (TemplateId->Kind == TNK_Type_template) {
1108 // We have a template-id that we know refers to a type,
1109 // translate it into a type and continue parsing as a cast
1111 AnnotateTemplateIdTokenAsType();
1112 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1113 NotCastExpr, isTypeCast);
1116 // Fall through to treat the template-id as an id-expression.
1119 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
1120 Res = ParseCXXIdExpression(isAddressOfOperand);
1123 case tok::coloncolon: {
1124 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
1125 // annotates the token, tail recurse.
1126 if (TryAnnotateTypeOrScopeToken())
1128 if (!Tok.is(tok::coloncolon))
1129 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
1131 // ::new -> [C++] new-expression
1132 // ::delete -> [C++] delete-expression
1133 SourceLocation CCLoc = ConsumeToken();
1134 if (Tok.is(tok::kw_new))
1135 return ParseCXXNewExpression(true, CCLoc);
1136 if (Tok.is(tok::kw_delete))
1137 return ParseCXXDeleteExpression(true, CCLoc);
1139 // This is not a type name or scope specifier, it is an invalid expression.
1140 Diag(CCLoc, diag::err_expected_expression);
1144 case tok::kw_new: // [C++] new-expression
1145 return ParseCXXNewExpression(false, Tok.getLocation());
1147 case tok::kw_delete: // [C++] delete-expression
1148 return ParseCXXDeleteExpression(false, Tok.getLocation());
1150 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
1151 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
1152 SourceLocation KeyLoc = ConsumeToken();
1153 BalancedDelimiterTracker T(*this, tok::l_paren);
1155 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
1157 // C++11 [expr.unary.noexcept]p1:
1158 // The noexcept operator determines whether the evaluation of its operand,
1159 // which is an unevaluated operand, can throw an exception.
1160 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
1161 ExprResult Result = ParseExpression();
1165 if (!Result.isInvalid())
1166 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
1167 Result.take(), T.getCloseLocation());
1171 case tok::kw___is_abstract: // [GNU] unary-type-trait
1172 case tok::kw___is_class:
1173 case tok::kw___is_empty:
1174 case tok::kw___is_enum:
1175 case tok::kw___is_interface_class:
1176 case tok::kw___is_literal:
1177 case tok::kw___is_arithmetic:
1178 case tok::kw___is_integral:
1179 case tok::kw___is_floating_point:
1180 case tok::kw___is_complete_type:
1181 case tok::kw___is_void:
1182 case tok::kw___is_array:
1183 case tok::kw___is_function:
1184 case tok::kw___is_reference:
1185 case tok::kw___is_lvalue_reference:
1186 case tok::kw___is_rvalue_reference:
1187 case tok::kw___is_fundamental:
1188 case tok::kw___is_object:
1189 case tok::kw___is_scalar:
1190 case tok::kw___is_compound:
1191 case tok::kw___is_pointer:
1192 case tok::kw___is_member_object_pointer:
1193 case tok::kw___is_member_function_pointer:
1194 case tok::kw___is_member_pointer:
1195 case tok::kw___is_const:
1196 case tok::kw___is_volatile:
1197 case tok::kw___is_standard_layout:
1198 case tok::kw___is_signed:
1199 case tok::kw___is_unsigned:
1200 case tok::kw___is_literal_type:
1201 case tok::kw___is_pod:
1202 case tok::kw___is_polymorphic:
1203 case tok::kw___is_trivial:
1204 case tok::kw___is_trivially_copyable:
1205 case tok::kw___is_union:
1206 case tok::kw___is_final:
1207 case tok::kw___is_sealed:
1208 case tok::kw___has_trivial_constructor:
1209 case tok::kw___has_trivial_move_constructor:
1210 case tok::kw___has_trivial_copy:
1211 case tok::kw___has_trivial_assign:
1212 case tok::kw___has_trivial_move_assign:
1213 case tok::kw___has_trivial_destructor:
1214 case tok::kw___has_nothrow_assign:
1215 case tok::kw___has_nothrow_move_assign:
1216 case tok::kw___has_nothrow_copy:
1217 case tok::kw___has_nothrow_constructor:
1218 case tok::kw___has_virtual_destructor:
1219 return ParseUnaryTypeTrait();
1221 case tok::kw___builtin_types_compatible_p:
1222 case tok::kw___is_base_of:
1223 case tok::kw___is_same:
1224 case tok::kw___is_convertible:
1225 case tok::kw___is_convertible_to:
1226 case tok::kw___is_trivially_assignable:
1227 return ParseBinaryTypeTrait();
1229 case tok::kw___is_trivially_constructible:
1230 return ParseTypeTrait();
1232 case tok::kw___array_rank:
1233 case tok::kw___array_extent:
1234 return ParseArrayTypeTrait();
1236 case tok::kw___is_lvalue_expr:
1237 case tok::kw___is_rvalue_expr:
1238 return ParseExpressionTrait();
1241 SourceLocation AtLoc = ConsumeToken();
1242 return ParseObjCAtExpression(AtLoc);
1245 Res = ParseBlockLiteralExpression();
1247 case tok::code_completion: {
1248 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
1253 if (getLangOpts().CPlusPlus11) {
1254 if (getLangOpts().ObjC1) {
1255 // C++11 lambda expressions and Objective-C message sends both start with a
1256 // square bracket. There are three possibilities here:
1257 // we have a valid lambda expression, we have an invalid lambda
1258 // expression, or we have something that doesn't appear to be a lambda.
1259 // If we're in the last case, we fall back to ParseObjCMessageExpression.
1260 Res = TryParseLambdaExpression();
1261 if (!Res.isInvalid() && !Res.get())
1262 Res = ParseObjCMessageExpression();
1265 Res = ParseLambdaExpression();
1268 if (getLangOpts().ObjC1) {
1269 Res = ParseObjCMessageExpression();
1278 // These can be followed by postfix-expr pieces.
1279 return ParsePostfixExpressionSuffix(Res);
1282 /// \brief Once the leading part of a postfix-expression is parsed, this
1283 /// method parses any suffixes that apply.
1286 /// postfix-expression: [C99 6.5.2]
1287 /// primary-expression
1288 /// postfix-expression '[' expression ']'
1289 /// postfix-expression '[' braced-init-list ']'
1290 /// postfix-expression '(' argument-expression-list[opt] ')'
1291 /// postfix-expression '.' identifier
1292 /// postfix-expression '->' identifier
1293 /// postfix-expression '++'
1294 /// postfix-expression '--'
1295 /// '(' type-name ')' '{' initializer-list '}'
1296 /// '(' type-name ')' '{' initializer-list ',' '}'
1298 /// argument-expression-list: [C99 6.5.2]
1299 /// argument-expression ...[opt]
1300 /// argument-expression-list ',' assignment-expression ...[opt]
1303 Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
1304 // Now that the primary-expression piece of the postfix-expression has been
1305 // parsed, see if there are any postfix-expression pieces here.
1308 switch (Tok.getKind()) {
1309 case tok::code_completion:
1310 if (InMessageExpression)
1313 Actions.CodeCompletePostfixExpression(getCurScope(), LHS);
1317 case tok::identifier:
1318 // If we see identifier: after an expression, and we're not already in a
1319 // message send, then this is probably a message send with a missing
1320 // opening bracket '['.
1321 if (getLangOpts().ObjC1 && !InMessageExpression &&
1322 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
1323 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1324 ParsedType(), LHS.get());
1328 // Fall through; this isn't a message send.
1330 default: // Not a postfix-expression suffix.
1332 case tok::l_square: { // postfix-expression: p-e '[' expression ']'
1333 // If we have a array postfix expression that starts on a new line and
1334 // Objective-C is enabled, it is highly likely that the user forgot a
1335 // semicolon after the base expression and that the array postfix-expr is
1336 // actually another message send. In this case, do some look-ahead to see
1337 // if the contents of the square brackets are obviously not a valid
1338 // expression and recover by pretending there is no suffix.
1339 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
1340 isSimpleObjCMessageExpression())
1343 // Reject array indices starting with a lambda-expression. '[[' is
1344 // reserved for attributes.
1345 if (CheckProhibitedCXX11Attribute())
1348 BalancedDelimiterTracker T(*this, tok::l_square);
1350 Loc = T.getOpenLocation();
1352 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1353 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1354 Idx = ParseBraceInitializer();
1356 Idx = ParseExpression();
1358 SourceLocation RLoc = Tok.getLocation();
1360 if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) {
1361 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc,
1371 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
1372 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
1373 // '(' argument-expression-list[opt] ')'
1374 tok::TokenKind OpKind = Tok.getKind();
1375 InMessageExpressionRAIIObject InMessage(*this, false);
1377 Expr *ExecConfig = 0;
1379 BalancedDelimiterTracker PT(*this, tok::l_paren);
1381 if (OpKind == tok::lesslessless) {
1382 ExprVector ExecConfigExprs;
1383 CommaLocsTy ExecConfigCommaLocs;
1384 SourceLocation OpenLoc = ConsumeToken();
1386 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
1390 SourceLocation CloseLoc = Tok.getLocation();
1391 if (Tok.is(tok::greatergreatergreater)) {
1393 } else if (LHS.isInvalid()) {
1394 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1396 // There was an error closing the brackets
1397 Diag(Tok, diag::err_expected_ggg);
1398 Diag(OpenLoc, diag::note_matching) << "<<<";
1399 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1403 if (!LHS.isInvalid()) {
1404 if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, ""))
1407 Loc = PrevTokLocation;
1410 if (!LHS.isInvalid()) {
1411 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
1415 if (ECResult.isInvalid())
1418 ExecConfig = ECResult.get();
1422 Loc = PT.getOpenLocation();
1425 ExprVector ArgExprs;
1426 CommaLocsTy CommaLocs;
1428 if (Tok.is(tok::code_completion)) {
1429 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None);
1434 if (OpKind == tok::l_paren || !LHS.isInvalid()) {
1435 if (Tok.isNot(tok::r_paren)) {
1436 if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall,
1444 if (LHS.isInvalid()) {
1445 SkipUntil(tok::r_paren, StopAtSemi);
1446 } else if (Tok.isNot(tok::r_paren)) {
1450 assert((ArgExprs.size() == 0 ||
1451 ArgExprs.size()-1 == CommaLocs.size())&&
1452 "Unexpected number of commas!");
1453 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc,
1454 ArgExprs, Tok.getLocation(),
1463 // postfix-expression: p-e '->' template[opt] id-expression
1464 // postfix-expression: p-e '.' template[opt] id-expression
1465 tok::TokenKind OpKind = Tok.getKind();
1466 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
1469 ParsedType ObjectType;
1470 bool MayBePseudoDestructor = false;
1471 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
1472 Expr *Base = LHS.take();
1473 const Type* BaseType = Base->getType().getTypePtrOrNull();
1474 if (BaseType && Tok.is(tok::l_paren) &&
1475 (BaseType->isFunctionType() ||
1476 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
1477 Diag(OpLoc, diag::err_function_is_not_record)
1478 << (OpKind == tok::arrow) << Base->getSourceRange()
1479 << FixItHint::CreateRemoval(OpLoc);
1480 return ParsePostfixExpressionSuffix(Base);
1483 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
1484 OpLoc, OpKind, ObjectType,
1485 MayBePseudoDestructor);
1486 if (LHS.isInvalid())
1489 ParseOptionalCXXScopeSpecifier(SS, ObjectType,
1490 /*EnteringContext=*/false,
1491 &MayBePseudoDestructor);
1492 if (SS.isNotEmpty())
1493 ObjectType = ParsedType();
1496 if (Tok.is(tok::code_completion)) {
1497 // Code completion for a member access expression.
1498 Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(),
1499 OpLoc, OpKind == tok::arrow);
1505 if (MayBePseudoDestructor && !LHS.isInvalid()) {
1506 LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS,
1511 // Either the action has told is that this cannot be a
1512 // pseudo-destructor expression (based on the type of base
1513 // expression), or we didn't see a '~' in the right place. We
1514 // can still parse a destructor name here, but in that case it
1515 // names a real destructor.
1516 // Allow explicit constructor calls in Microsoft mode.
1517 // FIXME: Add support for explicit call of template constructor.
1518 SourceLocation TemplateKWLoc;
1520 if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) {
1522 // After a '.' in a member access expression, treat the keyword
1523 // 'class' as if it were an identifier.
1525 // This hack allows property access to the 'class' method because it is
1526 // such a common method name. For other C++ keywords that are
1527 // Objective-C method names, one must use the message send syntax.
1528 IdentifierInfo *Id = Tok.getIdentifierInfo();
1529 SourceLocation Loc = ConsumeToken();
1530 Name.setIdentifier(Id, Loc);
1531 } else if (ParseUnqualifiedId(SS,
1532 /*EnteringContext=*/false,
1533 /*AllowDestructorName=*/true,
1534 /*AllowConstructorName=*/
1535 getLangOpts().MicrosoftExt,
1536 ObjectType, TemplateKWLoc, Name))
1539 if (!LHS.isInvalid())
1540 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc,
1541 OpKind, SS, TemplateKWLoc, Name,
1542 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0,
1543 Tok.is(tok::l_paren));
1546 case tok::plusplus: // postfix-expression: postfix-expression '++'
1547 case tok::minusminus: // postfix-expression: postfix-expression '--'
1548 if (!LHS.isInvalid()) {
1549 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
1550 Tok.getKind(), LHS.take());
1558 /// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
1559 /// vec_step and we are at the start of an expression or a parenthesized
1560 /// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
1561 /// expression (isCastExpr == false) or the type (isCastExpr == true).
1564 /// unary-expression: [C99 6.5.3]
1565 /// 'sizeof' unary-expression
1566 /// 'sizeof' '(' type-name ')'
1567 /// [GNU] '__alignof' unary-expression
1568 /// [GNU] '__alignof' '(' type-name ')'
1569 /// [C11] '_Alignof' '(' type-name ')'
1570 /// [C++0x] 'alignof' '(' type-id ')'
1572 /// [GNU] typeof-specifier:
1573 /// typeof ( expressions )
1574 /// typeof ( type-name )
1575 /// [GNU/C++] typeof unary-expression
1577 /// [OpenCL 1.1 6.11.12] vec_step built-in function:
1578 /// vec_step ( expressions )
1579 /// vec_step ( type-name )
1582 Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
1585 SourceRange &CastRange) {
1587 assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) ||
1588 OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) ||
1589 OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) &&
1590 "Not a typeof/sizeof/alignof/vec_step expression!");
1594 // If the operand doesn't start with an '(', it must be an expression.
1595 if (Tok.isNot(tok::l_paren)) {
1596 // If construct allows a form without parenthesis, user may forget to put
1597 // pathenthesis around type name.
1598 if (OpTok.is(tok::kw_sizeof) || OpTok.is(tok::kw___alignof) ||
1599 OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) {
1600 bool isAmbiguousTypeId;
1601 if (isTypeIdInParens(isAmbiguousTypeId)) {
1602 DeclSpec DS(AttrFactory);
1603 ParseSpecifierQualifierList(DS);
1604 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1605 ParseDeclarator(DeclaratorInfo);
1607 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
1608 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
1609 Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
1611 << FixItHint::CreateInsertion(LParenLoc, "(")
1612 << FixItHint::CreateInsertion(RParenLoc, ")");
1619 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
1620 Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo();
1624 Operand = ParseCastExpression(true/*isUnaryExpression*/);
1626 // If it starts with a '(', we know that it is either a parenthesized
1627 // type-name, or it is a unary-expression that starts with a compound
1628 // literal, or starts with a primary-expression that is a parenthesized
1630 ParenParseOption ExprType = CastExpr;
1631 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
1633 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
1634 false, CastTy, RParenLoc);
1635 CastRange = SourceRange(LParenLoc, RParenLoc);
1637 // If ParseParenExpression parsed a '(typename)' sequence only, then this is
1639 if (ExprType == CastExpr) {
1644 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
1645 // GNU typeof in C requires the expression to be parenthesized. Not so for
1646 // sizeof/alignof or in C++. Therefore, the parenthesized expression is
1647 // the start of a unary-expression, but doesn't include any postfix
1648 // pieces. Parse these now if present.
1649 if (!Operand.isInvalid())
1650 Operand = ParsePostfixExpressionSuffix(Operand.get());
1654 // If we get here, the operand to the typeof/sizeof/alignof was an expresion.
1660 /// \brief Parse a sizeof or alignof expression.
1663 /// unary-expression: [C99 6.5.3]
1664 /// 'sizeof' unary-expression
1665 /// 'sizeof' '(' type-name ')'
1666 /// [C++11] 'sizeof' '...' '(' identifier ')'
1667 /// [GNU] '__alignof' unary-expression
1668 /// [GNU] '__alignof' '(' type-name ')'
1669 /// [C11] '_Alignof' '(' type-name ')'
1670 /// [C++11] 'alignof' '(' type-id ')'
1672 ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
1673 assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) ||
1674 Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) ||
1675 Tok.is(tok::kw_vec_step)) &&
1676 "Not a sizeof/alignof/vec_step expression!");
1680 // [C++11] 'sizeof' '...' '(' identifier ')'
1681 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
1682 SourceLocation EllipsisLoc = ConsumeToken();
1683 SourceLocation LParenLoc, RParenLoc;
1684 IdentifierInfo *Name = 0;
1685 SourceLocation NameLoc;
1686 if (Tok.is(tok::l_paren)) {
1687 BalancedDelimiterTracker T(*this, tok::l_paren);
1689 LParenLoc = T.getOpenLocation();
1690 if (Tok.is(tok::identifier)) {
1691 Name = Tok.getIdentifierInfo();
1692 NameLoc = ConsumeToken();
1694 RParenLoc = T.getCloseLocation();
1695 if (RParenLoc.isInvalid())
1696 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1698 Diag(Tok, diag::err_expected_parameter_pack);
1699 SkipUntil(tok::r_paren, StopAtSemi);
1701 } else if (Tok.is(tok::identifier)) {
1702 Name = Tok.getIdentifierInfo();
1703 NameLoc = ConsumeToken();
1704 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
1705 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1706 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
1708 << FixItHint::CreateInsertion(LParenLoc, "(")
1709 << FixItHint::CreateInsertion(RParenLoc, ")");
1711 Diag(Tok, diag::err_sizeof_parameter_pack);
1717 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
1718 Sema::ReuseLambdaContextDecl);
1720 return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
1721 OpTok.getLocation(),
1726 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
1727 Diag(OpTok, diag::warn_cxx98_compat_alignof);
1729 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
1730 Sema::ReuseLambdaContextDecl);
1734 SourceRange CastRange;
1735 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
1740 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
1741 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) ||
1742 OpTok.is(tok::kw__Alignof))
1743 ExprKind = UETT_AlignOf;
1744 else if (OpTok.is(tok::kw_vec_step))
1745 ExprKind = UETT_VecStep;
1748 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1751 CastTy.getAsOpaquePtr(),
1754 if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
1755 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
1757 // If we get here, the operand to the sizeof/alignof was an expresion.
1758 if (!Operand.isInvalid())
1759 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1767 /// ParseBuiltinPrimaryExpression
1770 /// primary-expression: [C99 6.5.1]
1771 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
1772 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
1773 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
1775 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
1776 /// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
1778 /// [GNU] offsetof-member-designator:
1779 /// [GNU] identifier
1780 /// [GNU] offsetof-member-designator '.' identifier
1781 /// [GNU] offsetof-member-designator '[' expression ']'
1783 ExprResult Parser::ParseBuiltinPrimaryExpression() {
1785 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
1787 tok::TokenKind T = Tok.getKind();
1788 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
1790 // All of these start with an open paren.
1791 if (Tok.isNot(tok::l_paren))
1792 return ExprError(Diag(Tok, diag::err_expected_lparen_after_id)
1795 BalancedDelimiterTracker PT(*this, tok::l_paren);
1801 default: llvm_unreachable("Not a builtin primary expression!");
1802 case tok::kw___builtin_va_arg: {
1803 ExprResult Expr(ParseAssignmentExpression());
1805 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1808 TypeResult Ty = ParseTypeName();
1810 if (Tok.isNot(tok::r_paren)) {
1811 Diag(Tok, diag::err_expected_rparen);
1815 if (Expr.isInvalid() || Ty.isInvalid())
1818 Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen());
1821 case tok::kw___builtin_offsetof: {
1822 SourceLocation TypeLoc = Tok.getLocation();
1823 TypeResult Ty = ParseTypeName();
1824 if (Ty.isInvalid()) {
1825 SkipUntil(tok::r_paren, StopAtSemi);
1829 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1832 // We must have at least one identifier here.
1833 if (Tok.isNot(tok::identifier)) {
1834 Diag(Tok, diag::err_expected_ident);
1835 SkipUntil(tok::r_paren, StopAtSemi);
1839 // Keep track of the various subcomponents we see.
1840 SmallVector<Sema::OffsetOfComponent, 4> Comps;
1842 Comps.push_back(Sema::OffsetOfComponent());
1843 Comps.back().isBrackets = false;
1844 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
1845 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
1847 // FIXME: This loop leaks the index expressions on error.
1849 if (Tok.is(tok::period)) {
1850 // offsetof-member-designator: offsetof-member-designator '.' identifier
1851 Comps.push_back(Sema::OffsetOfComponent());
1852 Comps.back().isBrackets = false;
1853 Comps.back().LocStart = ConsumeToken();
1855 if (Tok.isNot(tok::identifier)) {
1856 Diag(Tok, diag::err_expected_ident);
1857 SkipUntil(tok::r_paren, StopAtSemi);
1860 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
1861 Comps.back().LocEnd = ConsumeToken();
1863 } else if (Tok.is(tok::l_square)) {
1864 if (CheckProhibitedCXX11Attribute())
1867 // offsetof-member-designator: offsetof-member-design '[' expression ']'
1868 Comps.push_back(Sema::OffsetOfComponent());
1869 Comps.back().isBrackets = true;
1870 BalancedDelimiterTracker ST(*this, tok::l_square);
1872 Comps.back().LocStart = ST.getOpenLocation();
1873 Res = ParseExpression();
1874 if (Res.isInvalid()) {
1875 SkipUntil(tok::r_paren, StopAtSemi);
1878 Comps.back().U.E = Res.release();
1881 Comps.back().LocEnd = ST.getCloseLocation();
1883 if (Tok.isNot(tok::r_paren)) {
1886 } else if (Ty.isInvalid()) {
1890 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
1891 Ty.get(), &Comps[0], Comps.size(),
1892 PT.getCloseLocation());
1899 case tok::kw___builtin_choose_expr: {
1900 ExprResult Cond(ParseAssignmentExpression());
1901 if (Cond.isInvalid()) {
1902 SkipUntil(tok::r_paren, StopAtSemi);
1905 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1908 ExprResult Expr1(ParseAssignmentExpression());
1909 if (Expr1.isInvalid()) {
1910 SkipUntil(tok::r_paren, StopAtSemi);
1913 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
1916 ExprResult Expr2(ParseAssignmentExpression());
1917 if (Expr2.isInvalid()) {
1918 SkipUntil(tok::r_paren, StopAtSemi);
1921 if (Tok.isNot(tok::r_paren)) {
1922 Diag(Tok, diag::err_expected_rparen);
1925 Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(),
1926 Expr2.take(), ConsumeParen());
1929 case tok::kw___builtin_astype: {
1930 // The first argument is an expression to be converted, followed by a comma.
1931 ExprResult Expr(ParseAssignmentExpression());
1932 if (Expr.isInvalid()) {
1933 SkipUntil(tok::r_paren, StopAtSemi);
1937 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",
1941 // Second argument is the type to bitcast to.
1942 TypeResult DestTy = ParseTypeName();
1943 if (DestTy.isInvalid())
1946 // Attempt to consume the r-paren.
1947 if (Tok.isNot(tok::r_paren)) {
1948 Diag(Tok, diag::err_expected_rparen);
1949 SkipUntil(tok::r_paren, StopAtSemi);
1953 Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc,
1957 case tok::kw___builtin_convertvector: {
1958 // The first argument is an expression to be converted, followed by a comma.
1959 ExprResult Expr(ParseAssignmentExpression());
1960 if (Expr.isInvalid()) {
1961 SkipUntil(tok::r_paren, StopAtSemi);
1965 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",
1969 // Second argument is the type to bitcast to.
1970 TypeResult DestTy = ParseTypeName();
1971 if (DestTy.isInvalid())
1974 // Attempt to consume the r-paren.
1975 if (Tok.isNot(tok::r_paren)) {
1976 Diag(Tok, diag::err_expected_rparen);
1977 SkipUntil(tok::r_paren, StopAtSemi);
1981 Res = Actions.ActOnConvertVectorExpr(Expr.take(), DestTy.get(), StartLoc,
1987 if (Res.isInvalid())
1990 // These can be followed by postfix-expr pieces because they are
1991 // primary-expressions.
1992 return ParsePostfixExpressionSuffix(Res.take());
1995 /// ParseParenExpression - This parses the unit that starts with a '(' token,
1996 /// based on what is allowed by ExprType. The actual thing parsed is returned
1997 /// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
1998 /// not the parsed cast-expression.
2001 /// primary-expression: [C99 6.5.1]
2002 /// '(' expression ')'
2003 /// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
2004 /// postfix-expression: [C99 6.5.2]
2005 /// '(' type-name ')' '{' initializer-list '}'
2006 /// '(' type-name ')' '{' initializer-list ',' '}'
2007 /// cast-expression: [C99 6.5.4]
2008 /// '(' type-name ')' cast-expression
2009 /// [ARC] bridged-cast-expression
2011 /// [ARC] bridged-cast-expression:
2012 /// (__bridge type-name) cast-expression
2013 /// (__bridge_transfer type-name) cast-expression
2014 /// (__bridge_retained type-name) cast-expression
2017 Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
2018 bool isTypeCast, ParsedType &CastTy,
2019 SourceLocation &RParenLoc) {
2020 assert(Tok.is(tok::l_paren) && "Not a paren expr!");
2021 BalancedDelimiterTracker T(*this, tok::l_paren);
2022 if (T.consumeOpen())
2024 SourceLocation OpenLoc = T.getOpenLocation();
2026 ExprResult Result(true);
2027 bool isAmbiguousTypeId;
2028 CastTy = ParsedType();
2030 if (Tok.is(tok::code_completion)) {
2031 Actions.CodeCompleteOrdinaryName(getCurScope(),
2032 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression
2033 : Sema::PCC_Expression);
2038 // Diagnose use of bridge casts in non-arc mode.
2039 bool BridgeCast = (getLangOpts().ObjC2 &&
2040 (Tok.is(tok::kw___bridge) ||
2041 Tok.is(tok::kw___bridge_transfer) ||
2042 Tok.is(tok::kw___bridge_retained) ||
2043 Tok.is(tok::kw___bridge_retain)));
2044 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
2045 if (Tok.isNot(tok::kw___bridge)) {
2046 StringRef BridgeCastName = Tok.getName();
2047 SourceLocation BridgeKeywordLoc = ConsumeToken();
2048 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2049 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
2051 << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
2054 ConsumeToken(); // consume __bridge
2058 // None of these cases should fall through with an invalid Result
2059 // unless they've already reported an error.
2060 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
2061 Diag(Tok, diag::ext_gnu_statement_expr);
2062 Actions.ActOnStartStmtExpr();
2064 StmtResult Stmt(ParseCompoundStatement(true));
2065 ExprType = CompoundStmt;
2067 // If the substmt parsed correctly, build the AST node.
2068 if (!Stmt.isInvalid()) {
2069 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation());
2071 Actions.ActOnStmtExprError();
2073 } else if (ExprType >= CompoundLiteral && BridgeCast) {
2074 tok::TokenKind tokenKind = Tok.getKind();
2075 SourceLocation BridgeKeywordLoc = ConsumeToken();
2077 // Parse an Objective-C ARC ownership cast expression.
2078 ObjCBridgeCastKind Kind;
2079 if (tokenKind == tok::kw___bridge)
2081 else if (tokenKind == tok::kw___bridge_transfer)
2082 Kind = OBC_BridgeTransfer;
2083 else if (tokenKind == tok::kw___bridge_retained)
2084 Kind = OBC_BridgeRetained;
2086 // As a hopefully temporary workaround, allow __bridge_retain as
2087 // a synonym for __bridge_retained, but only in system headers.
2088 assert(tokenKind == tok::kw___bridge_retain);
2089 Kind = OBC_BridgeRetained;
2090 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2091 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
2092 << FixItHint::CreateReplacement(BridgeKeywordLoc,
2093 "__bridge_retained");
2096 TypeResult Ty = ParseTypeName();
2098 RParenLoc = T.getCloseLocation();
2099 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false);
2101 if (Ty.isInvalid() || SubExpr.isInvalid())
2104 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
2105 BridgeKeywordLoc, Ty.get(),
2106 RParenLoc, SubExpr.get());
2107 } else if (ExprType >= CompoundLiteral &&
2108 isTypeIdInParens(isAmbiguousTypeId)) {
2110 // Otherwise, this is a compound literal expression or cast expression.
2112 // In C++, if the type-id is ambiguous we disambiguate based on context.
2113 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof
2114 // in which case we should treat it as type-id.
2115 // if stopIfCastExpr is false, we need to determine the context past the
2116 // parens, so we defer to ParseCXXAmbiguousParenExpression for that.
2117 if (isAmbiguousTypeId && !stopIfCastExpr) {
2118 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T);
2119 RParenLoc = T.getCloseLocation();
2123 // Parse the type declarator.
2124 DeclSpec DS(AttrFactory);
2125 ParseSpecifierQualifierList(DS);
2126 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
2127 ParseDeclarator(DeclaratorInfo);
2129 // If our type is followed by an identifier and either ':' or ']', then
2130 // this is probably an Objective-C message send where the leading '[' is
2131 // missing. Recover as if that were the case.
2132 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
2133 !InMessageExpression && getLangOpts().ObjC1 &&
2134 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
2137 InMessageExpressionRAIIObject InMessage(*this, false);
2138 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2140 Result = ParseObjCMessageExpressionBody(SourceLocation(),
2146 RParenLoc = T.getCloseLocation();
2147 if (Tok.is(tok::l_brace)) {
2148 ExprType = CompoundLiteral;
2151 InMessageExpressionRAIIObject InMessage(*this, false);
2152 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2154 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
2157 if (ExprType == CastExpr) {
2158 // We parsed '(' type-name ')' and the thing after it wasn't a '{'.
2160 if (DeclaratorInfo.isInvalidType())
2163 // Note that this doesn't parse the subsequent cast-expression, it just
2164 // returns the parsed type to the callee.
2165 if (stopIfCastExpr) {
2168 InMessageExpressionRAIIObject InMessage(*this, false);
2169 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2172 return ExprResult();
2175 // Reject the cast of super idiom in ObjC.
2176 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 &&
2177 Tok.getIdentifierInfo() == Ident_super &&
2178 getCurScope()->isInObjcMethodScope() &&
2179 GetLookAheadToken(1).isNot(tok::period)) {
2180 Diag(Tok.getLocation(), diag::err_illegal_super_cast)
2181 << SourceRange(OpenLoc, RParenLoc);
2185 // Parse the cast-expression that follows it next.
2186 // TODO: For cast expression with CastTy.
2187 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2188 /*isAddressOfOperand=*/false,
2189 /*isTypeCast=*/IsTypeCast);
2190 if (!Result.isInvalid()) {
2191 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2192 DeclaratorInfo, CastTy,
2193 RParenLoc, Result.take());
2198 Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
2201 } else if (isTypeCast) {
2202 // Parse the expression-list.
2203 InMessageExpressionRAIIObject InMessage(*this, false);
2205 ExprVector ArgExprs;
2206 CommaLocsTy CommaLocs;
2208 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
2209 ExprType = SimpleExpr;
2210 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
2214 InMessageExpressionRAIIObject InMessage(*this, false);
2216 Result = ParseExpression(MaybeTypeCast);
2217 ExprType = SimpleExpr;
2219 // Don't build a paren expression unless we actually match a ')'.
2220 if (!Result.isInvalid() && Tok.is(tok::r_paren))
2221 Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take());
2225 if (Result.isInvalid()) {
2226 SkipUntil(tok::r_paren, StopAtSemi);
2231 RParenLoc = T.getCloseLocation();
2235 /// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
2236 /// and we are at the left brace.
2239 /// postfix-expression: [C99 6.5.2]
2240 /// '(' type-name ')' '{' initializer-list '}'
2241 /// '(' type-name ')' '{' initializer-list ',' '}'
2244 Parser::ParseCompoundLiteralExpression(ParsedType Ty,
2245 SourceLocation LParenLoc,
2246 SourceLocation RParenLoc) {
2247 assert(Tok.is(tok::l_brace) && "Not a compound literal!");
2248 if (!getLangOpts().C99) // Compound literals don't exist in C90.
2249 Diag(LParenLoc, diag::ext_c99_compound_literal);
2250 ExprResult Result = ParseInitializer();
2251 if (!Result.isInvalid() && Ty)
2252 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take());
2256 /// ParseStringLiteralExpression - This handles the various token types that
2257 /// form string literals, and also handles string concatenation [C99 5.1.1.2,
2258 /// translation phase #6].
2261 /// primary-expression: [C99 6.5.1]
2264 ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
2265 assert(isTokenStringLiteral() && "Not a string literal!");
2267 // String concat. Note that keywords like __func__ and __FUNCTION__ are not
2268 // considered to be strings for concatenation purposes.
2269 SmallVector<Token, 4> StringToks;
2272 StringToks.push_back(Tok);
2273 ConsumeStringToken();
2274 } while (isTokenStringLiteral());
2276 // Pass the set of string tokens, ready for concatenation, to the actions.
2277 return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(),
2278 AllowUserDefinedLiteral ? getCurScope() : 0);
2281 /// ParseGenericSelectionExpression - Parse a C11 generic-selection
2285 /// generic-selection:
2286 /// _Generic ( assignment-expression , generic-assoc-list )
2287 /// generic-assoc-list:
2288 /// generic-association
2289 /// generic-assoc-list , generic-association
2290 /// generic-association:
2291 /// type-name : assignment-expression
2292 /// default : assignment-expression
2294 ExprResult Parser::ParseGenericSelectionExpression() {
2295 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
2296 SourceLocation KeyLoc = ConsumeToken();
2298 if (!getLangOpts().C11)
2299 Diag(KeyLoc, diag::ext_c11_generic_selection);
2301 BalancedDelimiterTracker T(*this, tok::l_paren);
2302 if (T.expectAndConsume(diag::err_expected_lparen))
2305 ExprResult ControllingExpr;
2307 // C11 6.5.1.1p3 "The controlling expression of a generic selection is
2309 EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
2310 ControllingExpr = ParseAssignmentExpression();
2311 if (ControllingExpr.isInvalid()) {
2312 SkipUntil(tok::r_paren, StopAtSemi);
2317 if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) {
2318 SkipUntil(tok::r_paren, StopAtSemi);
2322 SourceLocation DefaultLoc;
2327 if (Tok.is(tok::kw_default)) {
2328 // C11 6.5.1.1p2 "A generic selection shall have no more than one default
2329 // generic association."
2330 if (!DefaultLoc.isInvalid()) {
2331 Diag(Tok, diag::err_duplicate_default_assoc);
2332 Diag(DefaultLoc, diag::note_previous_default_assoc);
2333 SkipUntil(tok::r_paren, StopAtSemi);
2336 DefaultLoc = ConsumeToken();
2339 ColonProtectionRAIIObject X(*this);
2340 TypeResult TR = ParseTypeName();
2341 if (TR.isInvalid()) {
2342 SkipUntil(tok::r_paren, StopAtSemi);
2347 Types.push_back(Ty);
2349 if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) {
2350 SkipUntil(tok::r_paren, StopAtSemi);
2354 // FIXME: These expressions should be parsed in a potentially potentially
2355 // evaluated context.
2356 ExprResult ER(ParseAssignmentExpression());
2357 if (ER.isInvalid()) {
2358 SkipUntil(tok::r_paren, StopAtSemi);
2361 Exprs.push_back(ER.release());
2363 if (Tok.isNot(tok::comma))
2369 if (T.getCloseLocation().isInvalid())
2372 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
2373 T.getCloseLocation(),
2374 ControllingExpr.release(),
2378 /// ParseExpressionList - Used for C/C++ (argument-)expression-list.
2381 /// argument-expression-list:
2382 /// assignment-expression
2383 /// argument-expression-list , assignment-expression
2385 /// [C++] expression-list:
2386 /// [C++] assignment-expression
2387 /// [C++] expression-list , assignment-expression
2389 /// [C++0x] expression-list:
2390 /// [C++0x] initializer-list
2392 /// [C++0x] initializer-list
2393 /// [C++0x] initializer-clause ...[opt]
2394 /// [C++0x] initializer-list , initializer-clause ...[opt]
2396 /// [C++0x] initializer-clause:
2397 /// [C++0x] assignment-expression
2398 /// [C++0x] braced-init-list
2400 bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs,
2401 SmallVectorImpl<SourceLocation> &CommaLocs,
2402 void (Sema::*Completer)(Scope *S,
2404 ArrayRef<Expr *> Args),
2407 if (Tok.is(tok::code_completion)) {
2409 (Actions.*Completer)(getCurScope(), Data, Exprs);
2411 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
2417 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
2418 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2419 Expr = ParseBraceInitializer();
2421 Expr = ParseAssignmentExpression();
2423 if (Tok.is(tok::ellipsis))
2424 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
2425 if (Expr.isInvalid())
2428 Exprs.push_back(Expr.release());
2430 if (Tok.isNot(tok::comma))
2432 // Move to the next argument, remember where the comma was.
2433 CommaLocs.push_back(ConsumeToken());
2437 /// ParseSimpleExpressionList - A simple comma-separated list of expressions,
2438 /// used for misc language extensions.
2441 /// simple-expression-list:
2442 /// assignment-expression
2443 /// simple-expression-list , assignment-expression
2446 Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
2447 SmallVectorImpl<SourceLocation> &CommaLocs) {
2449 ExprResult Expr = ParseAssignmentExpression();
2450 if (Expr.isInvalid())
2453 Exprs.push_back(Expr.release());
2455 if (Tok.isNot(tok::comma))
2458 // Move to the next argument, remember where the comma was.
2459 CommaLocs.push_back(ConsumeToken());
2463 /// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
2466 /// [clang] block-id:
2467 /// [clang] specifier-qualifier-list block-declarator
2469 void Parser::ParseBlockId(SourceLocation CaretLoc) {
2470 if (Tok.is(tok::code_completion)) {
2471 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
2472 return cutOffParsing();
2475 // Parse the specifier-qualifier-list piece.
2476 DeclSpec DS(AttrFactory);
2477 ParseSpecifierQualifierList(DS);
2479 // Parse the block-declarator.
2480 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext);
2481 ParseDeclarator(DeclaratorInfo);
2483 // We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes.
2484 DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation());
2486 MaybeParseGNUAttributes(DeclaratorInfo);
2488 // Inform sema that we are starting a block.
2489 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
2492 /// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
2493 /// like ^(int x){ return x+1; }
2497 /// [clang] '^' block-args[opt] compound-statement
2498 /// [clang] '^' block-id compound-statement
2499 /// [clang] block-args:
2500 /// [clang] '(' parameter-list ')'
2502 ExprResult Parser::ParseBlockLiteralExpression() {
2503 assert(Tok.is(tok::caret) && "block literal starts with ^");
2504 SourceLocation CaretLoc = ConsumeToken();
2506 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
2507 "block literal parsing");
2509 // Enter a scope to hold everything within the block. This includes the
2510 // argument decls, decls within the compound expression, etc. This also
2511 // allows determining whether a variable reference inside the block is
2512 // within or outside of the block.
2513 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
2516 // Inform sema that we are starting a block.
2517 Actions.ActOnBlockStart(CaretLoc, getCurScope());
2519 // Parse the return type if present.
2520 DeclSpec DS(AttrFactory);
2521 Declarator ParamInfo(DS, Declarator::BlockLiteralContext);
2522 // FIXME: Since the return type isn't actually parsed, it can't be used to
2523 // fill ParamInfo with an initial valid range, so do it manually.
2524 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
2526 // If this block has arguments, parse them. There is no ambiguity here with
2527 // the expression case, because the expression case requires a parameter list.
2528 if (Tok.is(tok::l_paren)) {
2529 ParseParenDeclarator(ParamInfo);
2530 // Parse the pieces after the identifier as if we had "int(...)".
2531 // SetIdentifier sets the source range end, but in this case we're past
2533 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
2534 ParamInfo.SetIdentifier(0, CaretLoc);
2535 ParamInfo.SetRangeEnd(Tmp);
2536 if (ParamInfo.isInvalidType()) {
2537 // If there was an error parsing the arguments, they may have
2538 // tried to use ^(x+y) which requires an argument list. Just
2539 // skip the whole block literal.
2540 Actions.ActOnBlockError(CaretLoc, getCurScope());
2544 MaybeParseGNUAttributes(ParamInfo);
2546 // Inform sema that we are starting a block.
2547 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2548 } else if (!Tok.is(tok::l_brace)) {
2549 ParseBlockId(CaretLoc);
2551 // Otherwise, pretend we saw (void).
2552 ParsedAttributes attrs(AttrFactory);
2553 SourceLocation NoLoc;
2554 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true,
2555 /*IsAmbiguous=*/false,
2556 /*RParenLoc=*/NoLoc,
2559 /*EllipsisLoc=*/NoLoc,
2560 /*RParenLoc=*/NoLoc,
2562 /*RefQualifierIsLvalueRef=*/true,
2563 /*RefQualifierLoc=*/NoLoc,
2564 /*ConstQualifierLoc=*/NoLoc,
2565 /*VolatileQualifierLoc=*/NoLoc,
2566 /*MutableLoc=*/NoLoc,
2570 /*ExceptionRanges=*/0,
2571 /*NumExceptions=*/0,
2577 MaybeParseGNUAttributes(ParamInfo);
2579 // Inform sema that we are starting a block.
2580 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2584 ExprResult Result(true);
2585 if (!Tok.is(tok::l_brace)) {
2586 // Saw something like: ^expr
2587 Diag(Tok, diag::err_expected_expression);
2588 Actions.ActOnBlockError(CaretLoc, getCurScope());
2592 StmtResult Stmt(ParseCompoundStatementBody());
2594 if (!Stmt.isInvalid())
2595 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope());
2597 Actions.ActOnBlockError(CaretLoc, getCurScope());
2601 /// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
2605 ExprResult Parser::ParseObjCBoolLiteral() {
2606 tok::TokenKind Kind = Tok.getKind();
2607 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);