1 //===--- ParseExpr.cpp - Expression Parsing -------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// \brief Provides the Expression parsing implementation.
13 /// Expressions in C99 basically consist of a bunch of binary operators with
14 /// unary operators and other random stuff at the leaves.
16 /// In the C99 grammar, these unary operators bind tightest and are represented
17 /// as the 'cast-expression' production. Everything else is either a binary
18 /// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are
19 /// handled by ParseCastExpression, the higher level pieces are handled by
20 /// ParseBinaryExpression.
22 //===----------------------------------------------------------------------===//
24 #include "clang/Parse/Parser.h"
25 #include "clang/AST/ASTContext.h"
26 #include "clang/Basic/PrettyStackTrace.h"
27 #include "clang/Parse/RAIIObjectsForParser.h"
28 #include "clang/Sema/DeclSpec.h"
29 #include "clang/Sema/ParsedTemplate.h"
30 #include "clang/Sema/Scope.h"
31 #include "clang/Sema/TypoCorrection.h"
32 #include "llvm/ADT/SmallVector.h"
33 using namespace clang;
35 /// \brief Simple precedence-based parser for binary/ternary operators.
37 /// Note: we diverge from the C99 grammar when parsing the assignment-expression
38 /// production. C99 specifies that the LHS of an assignment operator should be
39 /// parsed as a unary-expression, but consistency dictates that it be a
40 /// conditional-expession. In practice, the important thing here is that the
41 /// LHS of an assignment has to be an l-value, which productions between
42 /// unary-expression and conditional-expression don't produce. Because we want
43 /// consistency, we parse the LHS as a conditional-expression, then check for
44 /// l-value-ness in semantic analysis stages.
47 /// pm-expression: [C++ 5.5]
49 /// pm-expression '.*' cast-expression
50 /// pm-expression '->*' cast-expression
52 /// multiplicative-expression: [C99 6.5.5]
53 /// Note: in C++, apply pm-expression instead of cast-expression
55 /// multiplicative-expression '*' cast-expression
56 /// multiplicative-expression '/' cast-expression
57 /// multiplicative-expression '%' cast-expression
59 /// additive-expression: [C99 6.5.6]
60 /// multiplicative-expression
61 /// additive-expression '+' multiplicative-expression
62 /// additive-expression '-' multiplicative-expression
64 /// shift-expression: [C99 6.5.7]
65 /// additive-expression
66 /// shift-expression '<<' additive-expression
67 /// shift-expression '>>' additive-expression
69 /// relational-expression: [C99 6.5.8]
71 /// relational-expression '<' shift-expression
72 /// relational-expression '>' shift-expression
73 /// relational-expression '<=' shift-expression
74 /// relational-expression '>=' shift-expression
76 /// equality-expression: [C99 6.5.9]
77 /// relational-expression
78 /// equality-expression '==' relational-expression
79 /// equality-expression '!=' relational-expression
81 /// AND-expression: [C99 6.5.10]
82 /// equality-expression
83 /// AND-expression '&' equality-expression
85 /// exclusive-OR-expression: [C99 6.5.11]
87 /// exclusive-OR-expression '^' AND-expression
89 /// inclusive-OR-expression: [C99 6.5.12]
90 /// exclusive-OR-expression
91 /// inclusive-OR-expression '|' exclusive-OR-expression
93 /// logical-AND-expression: [C99 6.5.13]
94 /// inclusive-OR-expression
95 /// logical-AND-expression '&&' inclusive-OR-expression
97 /// logical-OR-expression: [C99 6.5.14]
98 /// logical-AND-expression
99 /// logical-OR-expression '||' logical-AND-expression
101 /// conditional-expression: [C99 6.5.15]
102 /// logical-OR-expression
103 /// logical-OR-expression '?' expression ':' conditional-expression
104 /// [GNU] logical-OR-expression '?' ':' conditional-expression
105 /// [C++] the third operand is an assignment-expression
107 /// assignment-expression: [C99 6.5.16]
108 /// conditional-expression
109 /// unary-expression assignment-operator assignment-expression
110 /// [C++] throw-expression [C++ 15]
112 /// assignment-operator: one of
113 /// = *= /= %= += -= <<= >>= &= ^= |=
115 /// expression: [C99 6.5.17]
116 /// assignment-expression ...[opt]
117 /// expression ',' assignment-expression ...[opt]
119 ExprResult Parser::ParseExpression(TypeCastState isTypeCast) {
120 ExprResult LHS(ParseAssignmentExpression(isTypeCast));
121 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
124 /// This routine is called when the '@' is seen and consumed.
125 /// Current token is an Identifier and is not a 'try'. This
126 /// routine is necessary to disambiguate \@try-statement from,
127 /// for example, \@encode-expression.
130 Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
131 ExprResult LHS(ParseObjCAtExpression(AtLoc));
132 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
135 /// This routine is called when a leading '__extension__' is seen and
136 /// consumed. This is necessary because the token gets consumed in the
137 /// process of disambiguating between an expression and a declaration.
139 Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
140 ExprResult LHS(true);
142 // Silence extension warnings in the sub-expression
143 ExtensionRAIIObject O(Diags);
145 LHS = ParseCastExpression(false);
148 if (!LHS.isInvalid())
149 LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__,
152 return ParseRHSOfBinaryExpression(LHS, prec::Comma);
155 /// \brief Parse an expr that doesn't include (top-level) commas.
156 ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) {
157 if (Tok.is(tok::code_completion)) {
158 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
163 if (Tok.is(tok::kw_throw))
164 return ParseThrowExpression();
165 if (Tok.is(tok::kw_co_yield))
166 return ParseCoyieldExpression();
168 ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false,
169 /*isAddressOfOperand=*/false,
171 return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
174 /// \brief Parse an assignment expression where part of an Objective-C message
175 /// send has already been parsed.
177 /// In this case \p LBracLoc indicates the location of the '[' of the message
178 /// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
179 /// the receiver of the message.
181 /// Since this handles full assignment-expression's, it handles postfix
182 /// expressions and other binary operators for these expressions as well.
184 Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
185 SourceLocation SuperLoc,
186 ParsedType ReceiverType,
187 Expr *ReceiverExpr) {
189 = ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
190 ReceiverType, ReceiverExpr);
191 R = ParsePostfixExpressionSuffix(R);
192 return ParseRHSOfBinaryExpression(R, prec::Assignment);
196 Parser::ParseConstantExpressionInExprEvalContext(TypeCastState isTypeCast) {
197 assert(Actions.ExprEvalContexts.back().Context ==
198 Sema::ExpressionEvaluationContext::ConstantEvaluated &&
199 "Call this function only if your ExpressionEvaluationContext is "
200 "already ConstantEvaluated");
201 ExprResult LHS(ParseCastExpression(false, false, isTypeCast));
202 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
203 return Actions.ActOnConstantExpression(Res);
206 ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
207 // C++03 [basic.def.odr]p2:
208 // An expression is potentially evaluated unless it appears where an
209 // integral constant expression is required (see 5.19) [...].
210 // C++98 and C++11 have no such rule, but this is only a defect in C++98.
211 EnterExpressionEvaluationContext ConstantEvaluated(
212 Actions, Sema::ExpressionEvaluationContext::ConstantEvaluated);
213 return ParseConstantExpressionInExprEvalContext(isTypeCast);
216 /// \brief Parse a constraint-expression.
219 /// constraint-expression: [Concepts TS temp.constr.decl p1]
220 /// logical-or-expression
222 ExprResult Parser::ParseConstraintExpression() {
223 // FIXME: this may erroneously consume a function-body as the braced
224 // initializer list of a compound literal
226 // FIXME: this may erroneously consume a parenthesized rvalue reference
227 // declarator as a parenthesized address-of-label expression
228 ExprResult LHS(ParseCastExpression(/*isUnaryExpression=*/false));
229 ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::LogicalOr));
234 bool Parser::isNotExpressionStart() {
235 tok::TokenKind K = Tok.getKind();
236 if (K == tok::l_brace || K == tok::r_brace ||
237 K == tok::kw_for || K == tok::kw_while ||
238 K == tok::kw_if || K == tok::kw_else ||
239 K == tok::kw_goto || K == tok::kw_try)
241 // If this is a decl-specifier, we can't be at the start of an expression.
242 return isKnownToBeDeclarationSpecifier();
245 /// We've parsed something that could plausibly be intended to be a template
246 /// name (\p LHS) followed by a '<' token, and the following code can't possibly
247 /// be an expression. Determine if this is likely to be a template-id and if so,
249 bool Parser::diagnoseUnknownTemplateId(ExprResult LHS, SourceLocation Less) {
250 TentativeParsingAction TPA(*this);
251 // FIXME: We could look at the token sequence in a lot more detail here.
252 if (SkipUntil(tok::greater, tok::greatergreater, tok::greatergreatergreater,
253 StopAtSemi | StopBeforeMatch)) {
256 SourceLocation Greater;
257 ParseGreaterThanInTemplateList(Greater, true, false);
258 Actions.diagnoseExprIntendedAsTemplateName(getCurScope(), LHS,
263 // There's no matching '>' token, this probably isn't supposed to be
264 // interpreted as a template-id. Parse it as an (ill-formed) comparison.
269 static bool isFoldOperator(prec::Level Level) {
270 return Level > prec::Unknown && Level != prec::Conditional;
272 static bool isFoldOperator(tok::TokenKind Kind) {
273 return isFoldOperator(getBinOpPrecedence(Kind, false, true));
276 /// \brief Parse a binary expression that starts with \p LHS and has a
277 /// precedence of at least \p MinPrec.
279 Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
280 prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
281 GreaterThanIsOperator,
282 getLangOpts().CPlusPlus11);
283 SourceLocation ColonLoc;
286 // If this token has a lower precedence than we are allowed to parse (e.g.
287 // because we are called recursively, or because the token is not a binop),
289 if (NextTokPrec < MinPrec)
292 // Consume the operator, saving the operator token for error reporting.
296 if (OpToken.is(tok::caretcaret)) {
297 return ExprError(Diag(Tok, diag::err_opencl_logical_exclusive_or));
299 // Bail out when encountering a comma followed by a token which can't
300 // possibly be the start of an expression. For instance:
301 // int f() { return 1, }
302 // We can't do this before consuming the comma, because
303 // isNotExpressionStart() looks at the token stream.
304 if (OpToken.is(tok::comma) && isNotExpressionStart()) {
310 // If a '<' token is followed by a type that can be a template argument and
311 // cannot be an expression, then this is ill-formed, but might be intended
312 // to be a template-id.
313 if (OpToken.is(tok::less) && Actions.mightBeIntendedToBeTemplateName(LHS) &&
314 (isKnownToBeDeclarationSpecifier() ||
315 Tok.isOneOf(tok::greater, tok::greatergreater,
316 tok::greatergreatergreater)) &&
317 diagnoseUnknownTemplateId(LHS, OpToken.getLocation()))
320 // If the next token is an ellipsis, then this is a fold-expression. Leave
321 // it alone so we can handle it in the paren expression.
322 if (isFoldOperator(NextTokPrec) && Tok.is(tok::ellipsis)) {
323 // FIXME: We can't check this via lookahead before we consume the token
324 // because that tickles a lexer bug.
330 // Special case handling for the ternary operator.
331 ExprResult TernaryMiddle(true);
332 if (NextTokPrec == prec::Conditional) {
333 if (Tok.isNot(tok::colon)) {
334 // Don't parse FOO:BAR as if it were a typo for FOO::BAR.
335 ColonProtectionRAIIObject X(*this);
337 // Handle this production specially:
338 // logical-OR-expression '?' expression ':' conditional-expression
339 // In particular, the RHS of the '?' is 'expression', not
340 // 'logical-OR-expression' as we might expect.
341 TernaryMiddle = ParseExpression();
342 if (TernaryMiddle.isInvalid()) {
343 Actions.CorrectDelayedTyposInExpr(LHS);
345 TernaryMiddle = nullptr;
348 // Special case handling of "X ? Y : Z" where Y is empty:
349 // logical-OR-expression '?' ':' conditional-expression [GNU]
350 TernaryMiddle = nullptr;
351 Diag(Tok, diag::ext_gnu_conditional_expr);
354 if (!TryConsumeToken(tok::colon, ColonLoc)) {
355 // Otherwise, we're missing a ':'. Assume that this was a typo that
356 // the user forgot. If we're not in a macro expansion, we can suggest
357 // a fixit hint. If there were two spaces before the current token,
358 // suggest inserting the colon in between them, otherwise insert ": ".
359 SourceLocation FILoc = Tok.getLocation();
360 const char *FIText = ": ";
361 const SourceManager &SM = PP.getSourceManager();
362 if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
363 assert(FILoc.isFileID());
364 bool IsInvalid = false;
365 const char *SourcePtr =
366 SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
367 if (!IsInvalid && *SourcePtr == ' ') {
369 SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
370 if (!IsInvalid && *SourcePtr == ' ') {
371 FILoc = FILoc.getLocWithOffset(-1);
377 Diag(Tok, diag::err_expected)
378 << tok::colon << FixItHint::CreateInsertion(FILoc, FIText);
379 Diag(OpToken, diag::note_matching) << tok::question;
380 ColonLoc = Tok.getLocation();
384 // Code completion for the right-hand side of an assignment expression
385 // goes through a special hook that takes the left-hand side into account.
386 if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) {
387 Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get());
392 // Parse another leaf here for the RHS of the operator.
393 // ParseCastExpression works here because all RHS expressions in C have it
394 // as a prefix, at least. However, in C++, an assignment-expression could
395 // be a throw-expression, which is not a valid cast-expression.
396 // Therefore we need some special-casing here.
397 // Also note that the third operand of the conditional operator is
398 // an assignment-expression in C++, and in C++11, we can have a
399 // braced-init-list on the RHS of an assignment. For better diagnostics,
400 // parse as if we were allowed braced-init-lists everywhere, and check that
401 // they only appear on the RHS of assignments later.
403 bool RHSIsInitList = false;
404 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
405 RHS = ParseBraceInitializer();
406 RHSIsInitList = true;
407 } else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
408 RHS = ParseAssignmentExpression();
410 RHS = ParseCastExpression(false);
412 if (RHS.isInvalid()) {
413 // FIXME: Errors generated by the delayed typo correction should be
414 // printed before errors from parsing the RHS, not after.
415 Actions.CorrectDelayedTyposInExpr(LHS);
416 if (TernaryMiddle.isUsable())
417 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
421 // Remember the precedence of this operator and get the precedence of the
422 // operator immediately to the right of the RHS.
423 prec::Level ThisPrec = NextTokPrec;
424 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
425 getLangOpts().CPlusPlus11);
427 // Assignment and conditional expressions are right-associative.
428 bool isRightAssoc = ThisPrec == prec::Conditional ||
429 ThisPrec == prec::Assignment;
431 // Get the precedence of the operator to the right of the RHS. If it binds
432 // more tightly with RHS than we do, evaluate it completely first.
433 if (ThisPrec < NextTokPrec ||
434 (ThisPrec == NextTokPrec && isRightAssoc)) {
435 if (!RHS.isInvalid() && RHSIsInitList) {
436 Diag(Tok, diag::err_init_list_bin_op)
437 << /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
440 // If this is left-associative, only parse things on the RHS that bind
441 // more tightly than the current operator. If it is left-associative, it
442 // is okay, to bind exactly as tightly. For example, compile A=B=C=D as
443 // A=(B=(C=D)), where each paren is a level of recursion here.
444 // The function takes ownership of the RHS.
445 RHS = ParseRHSOfBinaryExpression(RHS,
446 static_cast<prec::Level>(ThisPrec + !isRightAssoc));
447 RHSIsInitList = false;
449 if (RHS.isInvalid()) {
450 // FIXME: Errors generated by the delayed typo correction should be
451 // printed before errors from ParseRHSOfBinaryExpression, not after.
452 Actions.CorrectDelayedTyposInExpr(LHS);
453 if (TernaryMiddle.isUsable())
454 TernaryMiddle = Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
458 NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
459 getLangOpts().CPlusPlus11);
462 if (!RHS.isInvalid() && RHSIsInitList) {
463 if (ThisPrec == prec::Assignment) {
464 Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
465 << Actions.getExprRange(RHS.get());
467 Diag(OpToken, diag::err_init_list_bin_op)
468 << /*RHS*/1 << PP.getSpelling(OpToken)
469 << Actions.getExprRange(RHS.get());
474 ExprResult OrigLHS = LHS;
475 if (!LHS.isInvalid()) {
476 // Combine the LHS and RHS into the LHS (e.g. build AST).
477 if (TernaryMiddle.isInvalid()) {
478 // If we're using '>>' as an operator within a template
479 // argument list (in C++98), suggest the addition of
480 // parentheses so that the code remains well-formed in C++0x.
481 if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
482 SuggestParentheses(OpToken.getLocation(),
483 diag::warn_cxx11_right_shift_in_template_arg,
484 SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
485 Actions.getExprRange(RHS.get()).getEnd()));
487 LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
488 OpToken.getKind(), LHS.get(), RHS.get());
491 LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
492 LHS.get(), TernaryMiddle.get(),
495 // In this case, ActOnBinOp or ActOnConditionalOp performed the
496 // CorrectDelayedTyposInExpr check.
497 if (!getLangOpts().CPlusPlus)
501 // Ensure potential typos aren't left undiagnosed.
502 if (LHS.isInvalid()) {
503 Actions.CorrectDelayedTyposInExpr(OrigLHS);
504 Actions.CorrectDelayedTyposInExpr(TernaryMiddle);
505 Actions.CorrectDelayedTyposInExpr(RHS);
510 /// \brief Parse a cast-expression, or, if \p isUnaryExpression is true,
511 /// parse a unary-expression.
513 /// \p isAddressOfOperand exists because an id-expression that is the
514 /// operand of address-of gets special treatment due to member pointers.
516 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
517 bool isAddressOfOperand,
518 TypeCastState isTypeCast,
519 bool isVectorLiteral) {
521 ExprResult Res = ParseCastExpression(isUnaryExpression,
527 Diag(Tok, diag::err_expected_expression);
532 class CastExpressionIdValidator : public CorrectionCandidateCallback {
534 CastExpressionIdValidator(Token Next, bool AllowTypes, bool AllowNonTypes)
535 : NextToken(Next), AllowNonTypes(AllowNonTypes) {
536 WantTypeSpecifiers = WantFunctionLikeCasts = AllowTypes;
539 bool ValidateCandidate(const TypoCorrection &candidate) override {
540 NamedDecl *ND = candidate.getCorrectionDecl();
542 return candidate.isKeyword();
544 if (isa<TypeDecl>(ND))
545 return WantTypeSpecifiers;
547 if (!AllowNonTypes || !CorrectionCandidateCallback::ValidateCandidate(candidate))
550 if (!NextToken.isOneOf(tok::equal, tok::arrow, tok::period))
553 for (auto *C : candidate) {
554 NamedDecl *ND = C->getUnderlyingDecl();
555 if (isa<ValueDecl>(ND) && !isa<FunctionDecl>(ND))
567 /// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse
568 /// a unary-expression.
570 /// \p isAddressOfOperand exists because an id-expression that is the operand
571 /// of address-of gets special treatment due to member pointers. NotCastExpr
572 /// is set to true if the token is not the start of a cast-expression, and no
573 /// diagnostic is emitted in this case and no tokens are consumed.
576 /// cast-expression: [C99 6.5.4]
578 /// '(' type-name ')' cast-expression
580 /// unary-expression: [C99 6.5.3]
581 /// postfix-expression
582 /// '++' unary-expression
583 /// '--' unary-expression
584 /// [Coro] 'co_await' cast-expression
585 /// unary-operator cast-expression
586 /// 'sizeof' unary-expression
587 /// 'sizeof' '(' type-name ')'
588 /// [C++11] 'sizeof' '...' '(' identifier ')'
589 /// [GNU] '__alignof' unary-expression
590 /// [GNU] '__alignof' '(' type-name ')'
591 /// [C11] '_Alignof' '(' type-name ')'
592 /// [C++11] 'alignof' '(' type-id ')'
593 /// [GNU] '&&' identifier
594 /// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
595 /// [C++] new-expression
596 /// [C++] delete-expression
598 /// unary-operator: one of
599 /// '&' '*' '+' '-' '~' '!'
600 /// [GNU] '__extension__' '__real' '__imag'
602 /// primary-expression: [C99 6.5.1]
604 /// [C++] id-expression
607 /// [C++] boolean-literal [C++ 2.13.5]
608 /// [C++11] 'nullptr' [C++11 2.14.7]
609 /// [C++11] user-defined-literal
610 /// '(' expression ')'
611 /// [C11] generic-selection
612 /// '__func__' [C99 6.4.2.2]
613 /// [GNU] '__FUNCTION__'
614 /// [MS] '__FUNCDNAME__'
615 /// [MS] 'L__FUNCTION__'
616 /// [GNU] '__PRETTY_FUNCTION__'
617 /// [GNU] '(' compound-statement ')'
618 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
619 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
620 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
622 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
624 /// [OBJC] '[' objc-message-expr ']'
625 /// [OBJC] '\@selector' '(' objc-selector-arg ')'
626 /// [OBJC] '\@protocol' '(' identifier ')'
627 /// [OBJC] '\@encode' '(' type-name ')'
628 /// [OBJC] objc-string-literal
629 /// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
630 /// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
631 /// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
632 /// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
633 /// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
634 /// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
635 /// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
636 /// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
637 /// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
638 /// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
639 /// [C++] 'this' [C++ 9.3.2]
640 /// [G++] unary-type-trait '(' type-id ')'
641 /// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
642 /// [EMBT] array-type-trait '(' type-id ',' integer ')'
643 /// [clang] '^' block-literal
645 /// constant: [C99 6.4.4]
647 /// floating-constant
648 /// enumeration-constant -> identifier
649 /// character-constant
651 /// id-expression: [C++ 5.1]
655 /// unqualified-id: [C++ 5.1]
657 /// operator-function-id
658 /// conversion-function-id
662 /// new-expression: [C++ 5.3.4]
663 /// '::'[opt] 'new' new-placement[opt] new-type-id
664 /// new-initializer[opt]
665 /// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
666 /// new-initializer[opt]
668 /// delete-expression: [C++ 5.3.5]
669 /// '::'[opt] 'delete' cast-expression
670 /// '::'[opt] 'delete' '[' ']' cast-expression
672 /// [GNU/Embarcadero] unary-type-trait:
673 /// '__is_arithmetic'
674 /// '__is_floating_point'
676 /// '__is_lvalue_expr'
677 /// '__is_rvalue_expr'
678 /// '__is_complete_type'
683 /// '__is_lvalue_reference'
684 /// '__is_rvalue_reference'
685 /// '__is_fundamental'
690 /// '__is_member_object_pointer'
691 /// '__is_member_function_pointer'
692 /// '__is_member_pointer'
696 /// '__is_standard_layout'
700 /// [GNU] unary-type-trait:
701 /// '__has_nothrow_assign'
702 /// '__has_nothrow_copy'
703 /// '__has_nothrow_constructor'
704 /// '__has_trivial_assign' [TODO]
705 /// '__has_trivial_copy' [TODO]
706 /// '__has_trivial_constructor'
707 /// '__has_trivial_destructor'
708 /// '__has_virtual_destructor'
709 /// '__is_abstract' [TODO]
711 /// '__is_empty' [TODO]
715 /// '__is_polymorphic'
716 /// '__is_sealed' [MS]
720 /// [Clang] unary-type-trait:
722 /// '__trivially_copyable'
724 /// binary-type-trait:
725 /// [GNU] '__is_base_of'
726 /// [MS] '__is_convertible_to'
727 /// '__is_convertible'
730 /// [Embarcadero] array-type-trait:
734 /// [Embarcadero] expression-trait:
735 /// '__is_lvalue_expr'
736 /// '__is_rvalue_expr'
739 ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
740 bool isAddressOfOperand,
742 TypeCastState isTypeCast,
743 bool isVectorLiteral) {
745 tok::TokenKind SavedKind = Tok.getKind();
748 // This handles all of cast-expression, unary-expression, postfix-expression,
749 // and primary-expression. We handle them together like this for efficiency
750 // and to simplify handling of an expression starting with a '(' token: which
751 // may be one of a parenthesized expression, cast-expression, compound literal
752 // expression, or statement expression.
754 // If the parsed tokens consist of a primary-expression, the cases below
755 // break out of the switch; at the end we call ParsePostfixExpressionSuffix
756 // to handle the postfix expression suffixes. Cases that cannot be followed
757 // by postfix exprs should return without invoking
758 // ParsePostfixExpressionSuffix.
761 // If this expression is limited to being a unary-expression, the parent can
762 // not start a cast expression.
763 ParenParseOption ParenExprType =
764 (isUnaryExpression && !getLangOpts().CPlusPlus) ? CompoundLiteral
767 SourceLocation RParenLoc;
768 Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
769 isTypeCast == IsTypeCast, CastTy, RParenLoc);
774 switch (ParenExprType) {
775 case SimpleExpr: break; // Nothing else to do.
776 case CompoundStmt: break; // Nothing else to do.
777 case CompoundLiteral:
778 // We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
779 // postfix-expression exist, parse them now.
782 // We have parsed the cast-expression and no postfix-expr pieces are
790 // primary-expression
791 case tok::numeric_constant:
792 // constant: integer-constant
793 // constant: floating-constant
795 Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
801 return ParseCXXBoolLiteral();
803 case tok::kw___objc_yes:
804 case tok::kw___objc_no:
805 return ParseObjCBoolLiteral();
807 case tok::kw_nullptr:
808 Diag(Tok, diag::warn_cxx98_compat_nullptr);
809 return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
811 case tok::annot_primary_expr:
812 assert(Res.get() == nullptr && "Stray primary-expression annotation?");
813 Res = getExprAnnotation(Tok);
814 ConsumeAnnotationToken();
817 case tok::kw___super:
818 case tok::kw_decltype:
819 // Annotate the token and tail recurse.
820 if (TryAnnotateTypeOrScopeToken())
822 assert(Tok.isNot(tok::kw_decltype) && Tok.isNot(tok::kw___super));
823 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
825 case tok::identifier: { // primary-expression: identifier
826 // unqualified-id: identifier
827 // constant: enumeration-constant
828 // Turn a potentially qualified name into a annot_typename or
829 // annot_cxxscope if it would be valid. This handles things like x::y, etc.
830 if (getLangOpts().CPlusPlus) {
831 // Avoid the unnecessary parse-time lookup in the common case
832 // where the syntax forbids a type.
833 const Token &Next = NextToken();
835 // If this identifier was reverted from a token ID, and the next token
836 // is a parenthesis, this is likely to be a use of a type trait. Check
838 if (Next.is(tok::l_paren) &&
839 Tok.is(tok::identifier) &&
840 Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
841 IdentifierInfo *II = Tok.getIdentifierInfo();
842 // Build up the mapping of revertible type traits, for future use.
843 if (RevertibleTypeTraits.empty()) {
844 #define RTT_JOIN(X,Y) X##Y
845 #define REVERTIBLE_TYPE_TRAIT(Name) \
846 RevertibleTypeTraits[PP.getIdentifierInfo(#Name)] \
847 = RTT_JOIN(tok::kw_,Name)
849 REVERTIBLE_TYPE_TRAIT(__is_abstract);
850 REVERTIBLE_TYPE_TRAIT(__is_aggregate);
851 REVERTIBLE_TYPE_TRAIT(__is_arithmetic);
852 REVERTIBLE_TYPE_TRAIT(__is_array);
853 REVERTIBLE_TYPE_TRAIT(__is_assignable);
854 REVERTIBLE_TYPE_TRAIT(__is_base_of);
855 REVERTIBLE_TYPE_TRAIT(__is_class);
856 REVERTIBLE_TYPE_TRAIT(__is_complete_type);
857 REVERTIBLE_TYPE_TRAIT(__is_compound);
858 REVERTIBLE_TYPE_TRAIT(__is_const);
859 REVERTIBLE_TYPE_TRAIT(__is_constructible);
860 REVERTIBLE_TYPE_TRAIT(__is_convertible);
861 REVERTIBLE_TYPE_TRAIT(__is_convertible_to);
862 REVERTIBLE_TYPE_TRAIT(__is_destructible);
863 REVERTIBLE_TYPE_TRAIT(__is_empty);
864 REVERTIBLE_TYPE_TRAIT(__is_enum);
865 REVERTIBLE_TYPE_TRAIT(__is_floating_point);
866 REVERTIBLE_TYPE_TRAIT(__is_final);
867 REVERTIBLE_TYPE_TRAIT(__is_function);
868 REVERTIBLE_TYPE_TRAIT(__is_fundamental);
869 REVERTIBLE_TYPE_TRAIT(__is_integral);
870 REVERTIBLE_TYPE_TRAIT(__is_interface_class);
871 REVERTIBLE_TYPE_TRAIT(__is_literal);
872 REVERTIBLE_TYPE_TRAIT(__is_lvalue_expr);
873 REVERTIBLE_TYPE_TRAIT(__is_lvalue_reference);
874 REVERTIBLE_TYPE_TRAIT(__is_member_function_pointer);
875 REVERTIBLE_TYPE_TRAIT(__is_member_object_pointer);
876 REVERTIBLE_TYPE_TRAIT(__is_member_pointer);
877 REVERTIBLE_TYPE_TRAIT(__is_nothrow_assignable);
878 REVERTIBLE_TYPE_TRAIT(__is_nothrow_constructible);
879 REVERTIBLE_TYPE_TRAIT(__is_nothrow_destructible);
880 REVERTIBLE_TYPE_TRAIT(__is_object);
881 REVERTIBLE_TYPE_TRAIT(__is_pod);
882 REVERTIBLE_TYPE_TRAIT(__is_pointer);
883 REVERTIBLE_TYPE_TRAIT(__is_polymorphic);
884 REVERTIBLE_TYPE_TRAIT(__is_reference);
885 REVERTIBLE_TYPE_TRAIT(__is_rvalue_expr);
886 REVERTIBLE_TYPE_TRAIT(__is_rvalue_reference);
887 REVERTIBLE_TYPE_TRAIT(__is_same);
888 REVERTIBLE_TYPE_TRAIT(__is_scalar);
889 REVERTIBLE_TYPE_TRAIT(__is_sealed);
890 REVERTIBLE_TYPE_TRAIT(__is_signed);
891 REVERTIBLE_TYPE_TRAIT(__is_standard_layout);
892 REVERTIBLE_TYPE_TRAIT(__is_trivial);
893 REVERTIBLE_TYPE_TRAIT(__is_trivially_assignable);
894 REVERTIBLE_TYPE_TRAIT(__is_trivially_constructible);
895 REVERTIBLE_TYPE_TRAIT(__is_trivially_copyable);
896 REVERTIBLE_TYPE_TRAIT(__is_union);
897 REVERTIBLE_TYPE_TRAIT(__is_unsigned);
898 REVERTIBLE_TYPE_TRAIT(__is_void);
899 REVERTIBLE_TYPE_TRAIT(__is_volatile);
900 #undef REVERTIBLE_TYPE_TRAIT
904 // If we find that this is in fact the name of a type trait,
905 // update the token kind in place and parse again to treat it as
906 // the appropriate kind of type trait.
907 llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
908 = RevertibleTypeTraits.find(II);
909 if (Known != RevertibleTypeTraits.end()) {
910 Tok.setKind(Known->second);
911 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
912 NotCastExpr, isTypeCast);
916 if ((!ColonIsSacred && Next.is(tok::colon)) ||
917 Next.isOneOf(tok::coloncolon, tok::less, tok::l_paren,
919 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
920 if (TryAnnotateTypeOrScopeToken())
922 if (!Tok.is(tok::identifier))
923 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
927 // Consume the identifier so that we can see if it is followed by a '(' or
929 IdentifierInfo &II = *Tok.getIdentifierInfo();
930 SourceLocation ILoc = ConsumeToken();
932 // Support 'Class.property' and 'super.property' notation.
933 if (getLangOpts().ObjC1 && Tok.is(tok::period) &&
934 (Actions.getTypeName(II, ILoc, getCurScope()) ||
935 // Allow the base to be 'super' if in an objc-method.
936 (&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
939 if (Tok.is(tok::code_completion) && &II != Ident_super) {
940 Actions.CodeCompleteObjCClassPropertyRefExpr(
941 getCurScope(), II, ILoc, ExprStatementTokLoc == ILoc);
945 // Allow either an identifier or the keyword 'class' (in C++).
946 if (Tok.isNot(tok::identifier) &&
947 !(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
948 Diag(Tok, diag::err_expected_property_name);
951 IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
952 SourceLocation PropertyLoc = ConsumeToken();
954 Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
959 // In an Objective-C method, if we have "super" followed by an identifier,
960 // the token sequence is ill-formed. However, if there's a ':' or ']' after
961 // that identifier, this is probably a message send with a missing open
962 // bracket. Treat it as such.
963 if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression &&
964 getCurScope()->isInObjcMethodScope() &&
965 ((Tok.is(tok::identifier) &&
966 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
967 Tok.is(tok::code_completion))) {
968 Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, nullptr,
973 // If we have an Objective-C class name followed by an identifier
974 // and either ':' or ']', this is an Objective-C class message
975 // send that's missing the opening '['. Recovery
976 // appropriately. Also take this path if we're performing code
977 // completion after an Objective-C class name.
978 if (getLangOpts().ObjC1 &&
979 ((Tok.is(tok::identifier) && !InMessageExpression) ||
980 Tok.is(tok::code_completion))) {
981 const Token& Next = NextToken();
982 if (Tok.is(tok::code_completion) ||
983 Next.is(tok::colon) || Next.is(tok::r_square))
984 if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
985 if (Typ.get()->isObjCObjectOrInterfaceType()) {
986 // Fake up a Declarator to use with ActOnTypeName.
987 DeclSpec DS(AttrFactory);
988 DS.SetRangeStart(ILoc);
989 DS.SetRangeEnd(ILoc);
990 const char *PrevSpec = nullptr;
992 DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ,
993 Actions.getASTContext().getPrintingPolicy());
995 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
996 TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
1001 Res = ParseObjCMessageExpressionBody(SourceLocation(),
1008 // Make sure to pass down the right value for isAddressOfOperand.
1009 if (isAddressOfOperand && isPostfixExpressionSuffixStart())
1010 isAddressOfOperand = false;
1012 // Function designators are allowed to be undeclared (C99 6.5.1p2), so we
1013 // need to know whether or not this identifier is a function designator or
1016 CXXScopeSpec ScopeSpec;
1017 SourceLocation TemplateKWLoc;
1019 auto Validator = llvm::make_unique<CastExpressionIdValidator>(
1020 Tok, isTypeCast != NotTypeCast, isTypeCast != IsTypeCast);
1021 Validator->IsAddressOfOperand = isAddressOfOperand;
1022 if (Tok.isOneOf(tok::periodstar, tok::arrowstar)) {
1023 Validator->WantExpressionKeywords = false;
1024 Validator->WantRemainingKeywords = false;
1026 Validator->WantRemainingKeywords = Tok.isNot(tok::r_paren);
1028 Name.setIdentifier(&II, ILoc);
1029 Res = Actions.ActOnIdExpression(
1030 getCurScope(), ScopeSpec, TemplateKWLoc, Name, Tok.is(tok::l_paren),
1031 isAddressOfOperand, std::move(Validator),
1032 /*IsInlineAsmIdentifier=*/false,
1033 Tok.is(tok::r_paren) ? nullptr : &Replacement);
1034 if (!Res.isInvalid() && !Res.get()) {
1035 UnconsumeToken(Replacement);
1036 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1037 NotCastExpr, isTypeCast);
1041 case tok::char_constant: // constant: character-constant
1042 case tok::wide_char_constant:
1043 case tok::utf8_char_constant:
1044 case tok::utf16_char_constant:
1045 case tok::utf32_char_constant:
1046 Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
1049 case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
1050 case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
1051 case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS]
1052 case tok::kw___FUNCSIG__: // primary-expression: __FUNCSIG__ [MS]
1053 case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
1054 case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
1055 Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
1058 case tok::string_literal: // primary-expression: string-literal
1059 case tok::wide_string_literal:
1060 case tok::utf8_string_literal:
1061 case tok::utf16_string_literal:
1062 case tok::utf32_string_literal:
1063 Res = ParseStringLiteralExpression(true);
1065 case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
1066 Res = ParseGenericSelectionExpression();
1068 case tok::kw___builtin_available:
1069 return ParseAvailabilityCheckExpr(Tok.getLocation());
1070 case tok::kw___builtin_va_arg:
1071 case tok::kw___builtin_offsetof:
1072 case tok::kw___builtin_choose_expr:
1073 case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
1074 case tok::kw___builtin_convertvector:
1075 return ParseBuiltinPrimaryExpression();
1076 case tok::kw___null:
1077 return Actions.ActOnGNUNullExpr(ConsumeToken());
1079 case tok::plusplus: // unary-expression: '++' unary-expression [C99]
1080 case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
1081 // C++ [expr.unary] has:
1082 // unary-expression:
1083 // ++ cast-expression
1084 // -- cast-expression
1085 Token SavedTok = Tok;
1087 // One special case is implicitly handled here: if the preceding tokens are
1088 // an ambiguous cast expression, such as "(T())++", then we recurse to
1089 // determine whether the '++' is prefix or postfix.
1090 Res = ParseCastExpression(!getLangOpts().CPlusPlus,
1091 /*isAddressOfOperand*/false, NotCastExpr,
1094 // If we return with NotCastExpr = true, we must not consume any tokens,
1095 // so put the token back where we found it.
1096 assert(Res.isInvalid());
1097 UnconsumeToken(SavedTok);
1100 if (!Res.isInvalid())
1101 Res = Actions.ActOnUnaryOp(getCurScope(), SavedTok.getLocation(),
1102 SavedKind, Res.get());
1105 case tok::amp: { // unary-expression: '&' cast-expression
1106 // Special treatment because of member pointers
1107 SourceLocation SavedLoc = ConsumeToken();
1108 Res = ParseCastExpression(false, true);
1109 if (!Res.isInvalid())
1110 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1114 case tok::star: // unary-expression: '*' cast-expression
1115 case tok::plus: // unary-expression: '+' cast-expression
1116 case tok::minus: // unary-expression: '-' cast-expression
1117 case tok::tilde: // unary-expression: '~' cast-expression
1118 case tok::exclaim: // unary-expression: '!' cast-expression
1119 case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
1120 case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
1121 SourceLocation SavedLoc = ConsumeToken();
1122 Res = ParseCastExpression(false);
1123 if (!Res.isInvalid())
1124 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1128 case tok::kw_co_await: { // unary-expression: 'co_await' cast-expression
1129 SourceLocation CoawaitLoc = ConsumeToken();
1130 Res = ParseCastExpression(false);
1131 if (!Res.isInvalid())
1132 Res = Actions.ActOnCoawaitExpr(getCurScope(), CoawaitLoc, Res.get());
1136 case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
1137 // __extension__ silences extension warnings in the subexpression.
1138 ExtensionRAIIObject O(Diags); // Use RAII to do this.
1139 SourceLocation SavedLoc = ConsumeToken();
1140 Res = ParseCastExpression(false);
1141 if (!Res.isInvalid())
1142 Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
1145 case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
1146 if (!getLangOpts().C11)
1147 Diag(Tok, diag::ext_c11_alignment) << Tok.getName();
1149 case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
1150 case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
1151 // unary-expression: '__alignof' '(' type-name ')'
1152 case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
1153 // unary-expression: 'sizeof' '(' type-name ')'
1154 case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
1155 // unary-expression: '__builtin_omp_required_simd_align' '(' type-name ')'
1156 case tok::kw___builtin_omp_required_simd_align:
1157 return ParseUnaryExprOrTypeTraitExpression();
1158 case tok::ampamp: { // unary-expression: '&&' identifier
1159 SourceLocation AmpAmpLoc = ConsumeToken();
1160 if (Tok.isNot(tok::identifier))
1161 return ExprError(Diag(Tok, diag::err_expected) << tok::identifier);
1163 if (getCurScope()->getFnParent() == nullptr)
1164 return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
1166 Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
1167 LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
1169 Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
1173 case tok::kw_const_cast:
1174 case tok::kw_dynamic_cast:
1175 case tok::kw_reinterpret_cast:
1176 case tok::kw_static_cast:
1177 Res = ParseCXXCasts();
1179 case tok::kw_typeid:
1180 Res = ParseCXXTypeid();
1182 case tok::kw___uuidof:
1183 Res = ParseCXXUuidof();
1186 Res = ParseCXXThis();
1189 case tok::annot_typename:
1190 if (isStartOfObjCClassMessageMissingOpenBracket()) {
1191 ParsedType Type = getTypeAnnotation(Tok);
1193 // Fake up a Declarator to use with ActOnTypeName.
1194 DeclSpec DS(AttrFactory);
1195 DS.SetRangeStart(Tok.getLocation());
1196 DS.SetRangeEnd(Tok.getLastLoc());
1198 const char *PrevSpec = nullptr;
1200 DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
1201 PrevSpec, DiagID, Type,
1202 Actions.getASTContext().getPrintingPolicy());
1204 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1205 TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
1209 ConsumeAnnotationToken();
1210 Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1216 case tok::annot_decltype:
1218 case tok::kw_wchar_t:
1219 case tok::kw_char16_t:
1220 case tok::kw_char32_t:
1225 case tok::kw___int64:
1226 case tok::kw___int128:
1227 case tok::kw_signed:
1228 case tok::kw_unsigned:
1231 case tok::kw_double:
1232 case tok::kw___float128:
1234 case tok::kw_typename:
1235 case tok::kw_typeof:
1236 case tok::kw___vector:
1237 #define GENERIC_IMAGE_TYPE(ImgType, Id) case tok::kw_##ImgType##_t:
1238 #include "clang/Basic/OpenCLImageTypes.def"
1240 if (!getLangOpts().CPlusPlus) {
1241 Diag(Tok, diag::err_expected_expression);
1245 if (SavedKind == tok::kw_typename) {
1246 // postfix-expression: typename-specifier '(' expression-list[opt] ')'
1247 // typename-specifier braced-init-list
1248 if (TryAnnotateTypeOrScopeToken())
1251 if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
1252 // We are trying to parse a simple-type-specifier but might not get such
1253 // a token after error recovery.
1257 // postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
1258 // simple-type-specifier braced-init-list
1260 DeclSpec DS(AttrFactory);
1262 ParseCXXSimpleTypeSpecifier(DS);
1263 if (Tok.isNot(tok::l_paren) &&
1264 (!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
1265 return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
1266 << DS.getSourceRange());
1268 if (Tok.is(tok::l_brace))
1269 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1271 Res = ParseCXXTypeConstructExpression(DS);
1275 case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
1276 // If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
1277 // (We can end up in this situation after tentative parsing.)
1278 if (TryAnnotateTypeOrScopeToken())
1280 if (!Tok.is(tok::annot_cxxscope))
1281 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1282 NotCastExpr, isTypeCast);
1284 Token Next = NextToken();
1285 if (Next.is(tok::annot_template_id)) {
1286 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
1287 if (TemplateId->Kind == TNK_Type_template) {
1288 // We have a qualified template-id that we know refers to a
1289 // type, translate it into a type and continue parsing as a
1292 ParseOptionalCXXScopeSpecifier(SS, nullptr,
1293 /*EnteringContext=*/false);
1294 AnnotateTemplateIdTokenAsType();
1295 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1296 NotCastExpr, isTypeCast);
1300 // Parse as an id-expression.
1301 Res = ParseCXXIdExpression(isAddressOfOperand);
1305 case tok::annot_template_id: { // [C++] template-id
1306 TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
1307 if (TemplateId->Kind == TNK_Type_template) {
1308 // We have a template-id that we know refers to a type,
1309 // translate it into a type and continue parsing as a cast
1311 AnnotateTemplateIdTokenAsType();
1312 return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
1313 NotCastExpr, isTypeCast);
1316 // Fall through to treat the template-id as an id-expression.
1319 case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
1320 Res = ParseCXXIdExpression(isAddressOfOperand);
1323 case tok::coloncolon: {
1324 // ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
1325 // annotates the token, tail recurse.
1326 if (TryAnnotateTypeOrScopeToken())
1328 if (!Tok.is(tok::coloncolon))
1329 return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
1331 // ::new -> [C++] new-expression
1332 // ::delete -> [C++] delete-expression
1333 SourceLocation CCLoc = ConsumeToken();
1334 if (Tok.is(tok::kw_new))
1335 return ParseCXXNewExpression(true, CCLoc);
1336 if (Tok.is(tok::kw_delete))
1337 return ParseCXXDeleteExpression(true, CCLoc);
1339 // This is not a type name or scope specifier, it is an invalid expression.
1340 Diag(CCLoc, diag::err_expected_expression);
1344 case tok::kw_new: // [C++] new-expression
1345 return ParseCXXNewExpression(false, Tok.getLocation());
1347 case tok::kw_delete: // [C++] delete-expression
1348 return ParseCXXDeleteExpression(false, Tok.getLocation());
1350 case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
1351 Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
1352 SourceLocation KeyLoc = ConsumeToken();
1353 BalancedDelimiterTracker T(*this, tok::l_paren);
1355 if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
1357 // C++11 [expr.unary.noexcept]p1:
1358 // The noexcept operator determines whether the evaluation of its operand,
1359 // which is an unevaluated operand, can throw an exception.
1360 EnterExpressionEvaluationContext Unevaluated(
1361 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
1362 ExprResult Result = ParseExpression();
1366 if (!Result.isInvalid())
1367 Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
1368 Result.get(), T.getCloseLocation());
1372 #define TYPE_TRAIT(N,Spelling,K) \
1373 case tok::kw_##Spelling:
1374 #include "clang/Basic/TokenKinds.def"
1375 return ParseTypeTrait();
1377 case tok::kw___array_rank:
1378 case tok::kw___array_extent:
1379 return ParseArrayTypeTrait();
1381 case tok::kw___is_lvalue_expr:
1382 case tok::kw___is_rvalue_expr:
1383 return ParseExpressionTrait();
1386 SourceLocation AtLoc = ConsumeToken();
1387 return ParseObjCAtExpression(AtLoc);
1390 Res = ParseBlockLiteralExpression();
1392 case tok::code_completion: {
1393 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
1398 if (getLangOpts().CPlusPlus11) {
1399 if (getLangOpts().ObjC1) {
1400 // C++11 lambda expressions and Objective-C message sends both start with a
1401 // square bracket. There are three possibilities here:
1402 // we have a valid lambda expression, we have an invalid lambda
1403 // expression, or we have something that doesn't appear to be a lambda.
1404 // If we're in the last case, we fall back to ParseObjCMessageExpression.
1405 Res = TryParseLambdaExpression();
1406 if (!Res.isInvalid() && !Res.get())
1407 Res = ParseObjCMessageExpression();
1410 Res = ParseLambdaExpression();
1413 if (getLangOpts().ObjC1) {
1414 Res = ParseObjCMessageExpression();
1423 // Check to see whether Res is a function designator only. If it is and we
1424 // are compiling for OpenCL, we need to return an error as this implies
1425 // that the address of the function is being taken, which is illegal in CL.
1427 // These can be followed by postfix-expr pieces.
1428 Res = ParsePostfixExpressionSuffix(Res);
1429 if (getLangOpts().OpenCL)
1430 if (Expr *PostfixExpr = Res.get()) {
1431 QualType Ty = PostfixExpr->getType();
1432 if (!Ty.isNull() && Ty->isFunctionType()) {
1433 Diag(PostfixExpr->getExprLoc(),
1434 diag::err_opencl_taking_function_address_parser);
1442 /// \brief Once the leading part of a postfix-expression is parsed, this
1443 /// method parses any suffixes that apply.
1446 /// postfix-expression: [C99 6.5.2]
1447 /// primary-expression
1448 /// postfix-expression '[' expression ']'
1449 /// postfix-expression '[' braced-init-list ']'
1450 /// postfix-expression '(' argument-expression-list[opt] ')'
1451 /// postfix-expression '.' identifier
1452 /// postfix-expression '->' identifier
1453 /// postfix-expression '++'
1454 /// postfix-expression '--'
1455 /// '(' type-name ')' '{' initializer-list '}'
1456 /// '(' type-name ')' '{' initializer-list ',' '}'
1458 /// argument-expression-list: [C99 6.5.2]
1459 /// argument-expression ...[opt]
1460 /// argument-expression-list ',' assignment-expression ...[opt]
1463 Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
1464 // Now that the primary-expression piece of the postfix-expression has been
1465 // parsed, see if there are any postfix-expression pieces here.
1468 switch (Tok.getKind()) {
1469 case tok::code_completion:
1470 if (InMessageExpression)
1473 Actions.CodeCompletePostfixExpression(getCurScope(), LHS);
1477 case tok::identifier:
1478 // If we see identifier: after an expression, and we're not already in a
1479 // message send, then this is probably a message send with a missing
1480 // opening bracket '['.
1481 if (getLangOpts().ObjC1 && !InMessageExpression &&
1482 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
1483 LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
1484 nullptr, LHS.get());
1488 // Fall through; this isn't a message send.
1490 default: // Not a postfix-expression suffix.
1492 case tok::l_square: { // postfix-expression: p-e '[' expression ']'
1493 // If we have a array postfix expression that starts on a new line and
1494 // Objective-C is enabled, it is highly likely that the user forgot a
1495 // semicolon after the base expression and that the array postfix-expr is
1496 // actually another message send. In this case, do some look-ahead to see
1497 // if the contents of the square brackets are obviously not a valid
1498 // expression and recover by pretending there is no suffix.
1499 if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
1500 isSimpleObjCMessageExpression())
1503 // Reject array indices starting with a lambda-expression. '[[' is
1504 // reserved for attributes.
1505 if (CheckProhibitedCXX11Attribute()) {
1506 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1510 BalancedDelimiterTracker T(*this, tok::l_square);
1512 Loc = T.getOpenLocation();
1513 ExprResult Idx, Length;
1514 SourceLocation ColonLoc;
1515 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
1516 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
1517 Idx = ParseBraceInitializer();
1518 } else if (getLangOpts().OpenMP) {
1519 ColonProtectionRAIIObject RAII(*this);
1520 // Parse [: or [ expr or [ expr :
1521 if (!Tok.is(tok::colon)) {
1523 Idx = ParseExpression();
1525 if (Tok.is(tok::colon)) {
1527 ColonLoc = ConsumeToken();
1528 if (Tok.isNot(tok::r_square))
1529 Length = ParseExpression();
1532 Idx = ParseExpression();
1534 SourceLocation RLoc = Tok.getLocation();
1536 ExprResult OrigLHS = LHS;
1537 if (!LHS.isInvalid() && !Idx.isInvalid() && !Length.isInvalid() &&
1538 Tok.is(tok::r_square)) {
1539 if (ColonLoc.isValid()) {
1540 LHS = Actions.ActOnOMPArraySectionExpr(LHS.get(), Loc, Idx.get(),
1541 ColonLoc, Length.get(), RLoc);
1543 LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.get(), Loc,
1549 if (LHS.isInvalid()) {
1550 (void)Actions.CorrectDelayedTyposInExpr(OrigLHS);
1551 (void)Actions.CorrectDelayedTyposInExpr(Idx);
1552 (void)Actions.CorrectDelayedTyposInExpr(Length);
1562 case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
1563 case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
1564 // '(' argument-expression-list[opt] ')'
1565 tok::TokenKind OpKind = Tok.getKind();
1566 InMessageExpressionRAIIObject InMessage(*this, false);
1568 Expr *ExecConfig = nullptr;
1570 BalancedDelimiterTracker PT(*this, tok::l_paren);
1572 if (OpKind == tok::lesslessless) {
1573 ExprVector ExecConfigExprs;
1574 CommaLocsTy ExecConfigCommaLocs;
1575 SourceLocation OpenLoc = ConsumeToken();
1577 if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
1578 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1582 SourceLocation CloseLoc;
1583 if (TryConsumeToken(tok::greatergreatergreater, CloseLoc)) {
1584 } else if (LHS.isInvalid()) {
1585 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1587 // There was an error closing the brackets
1588 Diag(Tok, diag::err_expected) << tok::greatergreatergreater;
1589 Diag(OpenLoc, diag::note_matching) << tok::lesslessless;
1590 SkipUntil(tok::greatergreatergreater, StopAtSemi);
1594 if (!LHS.isInvalid()) {
1595 if (ExpectAndConsume(tok::l_paren))
1598 Loc = PrevTokLocation;
1601 if (!LHS.isInvalid()) {
1602 ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
1606 if (ECResult.isInvalid())
1609 ExecConfig = ECResult.get();
1613 Loc = PT.getOpenLocation();
1616 ExprVector ArgExprs;
1617 CommaLocsTy CommaLocs;
1619 if (Tok.is(tok::code_completion)) {
1620 Actions.CodeCompleteCall(getCurScope(), LHS.get(), None);
1625 if (OpKind == tok::l_paren || !LHS.isInvalid()) {
1626 if (Tok.isNot(tok::r_paren)) {
1627 if (ParseExpressionList(ArgExprs, CommaLocs, [&] {
1628 Actions.CodeCompleteCall(getCurScope(), LHS.get(), ArgExprs);
1630 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1632 } else if (LHS.isInvalid()) {
1633 for (auto &E : ArgExprs)
1634 Actions.CorrectDelayedTyposInExpr(E);
1640 if (LHS.isInvalid()) {
1641 SkipUntil(tok::r_paren, StopAtSemi);
1642 } else if (Tok.isNot(tok::r_paren)) {
1643 bool HadDelayedTypo = false;
1644 if (Actions.CorrectDelayedTyposInExpr(LHS).get() != LHS.get())
1645 HadDelayedTypo = true;
1646 for (auto &E : ArgExprs)
1647 if (Actions.CorrectDelayedTyposInExpr(E).get() != E)
1648 HadDelayedTypo = true;
1649 // If there were delayed typos in the LHS or ArgExprs, call SkipUntil
1650 // instead of PT.consumeClose() to avoid emitting extra diagnostics for
1651 // the unmatched l_paren.
1653 SkipUntil(tok::r_paren, StopAtSemi);
1658 assert((ArgExprs.size() == 0 ||
1659 ArgExprs.size()-1 == CommaLocs.size())&&
1660 "Unexpected number of commas!");
1661 LHS = Actions.ActOnCallExpr(getCurScope(), LHS.get(), Loc,
1662 ArgExprs, Tok.getLocation(),
1671 // postfix-expression: p-e '->' template[opt] id-expression
1672 // postfix-expression: p-e '.' template[opt] id-expression
1673 tok::TokenKind OpKind = Tok.getKind();
1674 SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
1677 ParsedType ObjectType;
1678 bool MayBePseudoDestructor = false;
1679 if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
1680 Expr *Base = LHS.get();
1681 const Type* BaseType = Base->getType().getTypePtrOrNull();
1682 if (BaseType && Tok.is(tok::l_paren) &&
1683 (BaseType->isFunctionType() ||
1684 BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
1685 Diag(OpLoc, diag::err_function_is_not_record)
1686 << OpKind << Base->getSourceRange()
1687 << FixItHint::CreateRemoval(OpLoc);
1688 return ParsePostfixExpressionSuffix(Base);
1691 LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
1692 OpLoc, OpKind, ObjectType,
1693 MayBePseudoDestructor);
1694 if (LHS.isInvalid())
1697 ParseOptionalCXXScopeSpecifier(SS, ObjectType,
1698 /*EnteringContext=*/false,
1699 &MayBePseudoDestructor);
1700 if (SS.isNotEmpty())
1701 ObjectType = nullptr;
1704 if (Tok.is(tok::code_completion)) {
1705 // Code completion for a member access expression.
1706 if (Expr *Base = LHS.get())
1707 Actions.CodeCompleteMemberReferenceExpr(
1708 getCurScope(), Base, OpLoc, OpKind == tok::arrow,
1709 ExprStatementTokLoc == Base->getLocStart());
1715 if (MayBePseudoDestructor && !LHS.isInvalid()) {
1716 LHS = ParseCXXPseudoDestructor(LHS.get(), OpLoc, OpKind, SS,
1721 // Either the action has told us that this cannot be a
1722 // pseudo-destructor expression (based on the type of base
1723 // expression), or we didn't see a '~' in the right place. We
1724 // can still parse a destructor name here, but in that case it
1725 // names a real destructor.
1726 // Allow explicit constructor calls in Microsoft mode.
1727 // FIXME: Add support for explicit call of template constructor.
1728 SourceLocation TemplateKWLoc;
1730 if (getLangOpts().ObjC2 && OpKind == tok::period &&
1731 Tok.is(tok::kw_class)) {
1733 // After a '.' in a member access expression, treat the keyword
1734 // 'class' as if it were an identifier.
1736 // This hack allows property access to the 'class' method because it is
1737 // such a common method name. For other C++ keywords that are
1738 // Objective-C method names, one must use the message send syntax.
1739 IdentifierInfo *Id = Tok.getIdentifierInfo();
1740 SourceLocation Loc = ConsumeToken();
1741 Name.setIdentifier(Id, Loc);
1742 } else if (ParseUnqualifiedId(SS,
1743 /*EnteringContext=*/false,
1744 /*AllowDestructorName=*/true,
1745 /*AllowConstructorName=*/
1746 getLangOpts().MicrosoftExt,
1747 /*AllowDeductionGuide=*/false,
1748 ObjectType, TemplateKWLoc, Name)) {
1749 (void)Actions.CorrectDelayedTyposInExpr(LHS);
1753 if (!LHS.isInvalid())
1754 LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.get(), OpLoc,
1755 OpKind, SS, TemplateKWLoc, Name,
1756 CurParsedObjCImpl ? CurParsedObjCImpl->Dcl
1760 case tok::plusplus: // postfix-expression: postfix-expression '++'
1761 case tok::minusminus: // postfix-expression: postfix-expression '--'
1762 if (!LHS.isInvalid()) {
1763 LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
1764 Tok.getKind(), LHS.get());
1772 /// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
1773 /// vec_step and we are at the start of an expression or a parenthesized
1774 /// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
1775 /// expression (isCastExpr == false) or the type (isCastExpr == true).
1778 /// unary-expression: [C99 6.5.3]
1779 /// 'sizeof' unary-expression
1780 /// 'sizeof' '(' type-name ')'
1781 /// [GNU] '__alignof' unary-expression
1782 /// [GNU] '__alignof' '(' type-name ')'
1783 /// [C11] '_Alignof' '(' type-name ')'
1784 /// [C++0x] 'alignof' '(' type-id ')'
1786 /// [GNU] typeof-specifier:
1787 /// typeof ( expressions )
1788 /// typeof ( type-name )
1789 /// [GNU/C++] typeof unary-expression
1791 /// [OpenCL 1.1 6.11.12] vec_step built-in function:
1792 /// vec_step ( expressions )
1793 /// vec_step ( type-name )
1796 Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
1799 SourceRange &CastRange) {
1801 assert(OpTok.isOneOf(tok::kw_typeof, tok::kw_sizeof, tok::kw___alignof,
1802 tok::kw_alignof, tok::kw__Alignof, tok::kw_vec_step,
1803 tok::kw___builtin_omp_required_simd_align) &&
1804 "Not a typeof/sizeof/alignof/vec_step expression!");
1808 // If the operand doesn't start with an '(', it must be an expression.
1809 if (Tok.isNot(tok::l_paren)) {
1810 // If construct allows a form without parenthesis, user may forget to put
1811 // pathenthesis around type name.
1812 if (OpTok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
1813 tok::kw__Alignof)) {
1814 if (isTypeIdUnambiguously()) {
1815 DeclSpec DS(AttrFactory);
1816 ParseSpecifierQualifierList(DS);
1817 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
1818 ParseDeclarator(DeclaratorInfo);
1820 SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
1821 SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
1822 Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
1824 << FixItHint::CreateInsertion(LParenLoc, "(")
1825 << FixItHint::CreateInsertion(RParenLoc, ")");
1832 if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
1833 Diag(Tok, diag::err_expected_after) << OpTok.getIdentifierInfo()
1838 Operand = ParseCastExpression(true/*isUnaryExpression*/);
1840 // If it starts with a '(', we know that it is either a parenthesized
1841 // type-name, or it is a unary-expression that starts with a compound
1842 // literal, or starts with a primary-expression that is a parenthesized
1844 ParenParseOption ExprType = CastExpr;
1845 SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
1847 Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
1848 false, CastTy, RParenLoc);
1849 CastRange = SourceRange(LParenLoc, RParenLoc);
1851 // If ParseParenExpression parsed a '(typename)' sequence only, then this is
1853 if (ExprType == CastExpr) {
1858 if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
1859 // GNU typeof in C requires the expression to be parenthesized. Not so for
1860 // sizeof/alignof or in C++. Therefore, the parenthesized expression is
1861 // the start of a unary-expression, but doesn't include any postfix
1862 // pieces. Parse these now if present.
1863 if (!Operand.isInvalid())
1864 Operand = ParsePostfixExpressionSuffix(Operand.get());
1868 // If we get here, the operand to the typeof/sizeof/alignof was an expresion.
1874 /// \brief Parse a sizeof or alignof expression.
1877 /// unary-expression: [C99 6.5.3]
1878 /// 'sizeof' unary-expression
1879 /// 'sizeof' '(' type-name ')'
1880 /// [C++11] 'sizeof' '...' '(' identifier ')'
1881 /// [GNU] '__alignof' unary-expression
1882 /// [GNU] '__alignof' '(' type-name ')'
1883 /// [C11] '_Alignof' '(' type-name ')'
1884 /// [C++11] 'alignof' '(' type-id ')'
1886 ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
1887 assert(Tok.isOneOf(tok::kw_sizeof, tok::kw___alignof, tok::kw_alignof,
1888 tok::kw__Alignof, tok::kw_vec_step,
1889 tok::kw___builtin_omp_required_simd_align) &&
1890 "Not a sizeof/alignof/vec_step expression!");
1894 // [C++11] 'sizeof' '...' '(' identifier ')'
1895 if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
1896 SourceLocation EllipsisLoc = ConsumeToken();
1897 SourceLocation LParenLoc, RParenLoc;
1898 IdentifierInfo *Name = nullptr;
1899 SourceLocation NameLoc;
1900 if (Tok.is(tok::l_paren)) {
1901 BalancedDelimiterTracker T(*this, tok::l_paren);
1903 LParenLoc = T.getOpenLocation();
1904 if (Tok.is(tok::identifier)) {
1905 Name = Tok.getIdentifierInfo();
1906 NameLoc = ConsumeToken();
1908 RParenLoc = T.getCloseLocation();
1909 if (RParenLoc.isInvalid())
1910 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1912 Diag(Tok, diag::err_expected_parameter_pack);
1913 SkipUntil(tok::r_paren, StopAtSemi);
1915 } else if (Tok.is(tok::identifier)) {
1916 Name = Tok.getIdentifierInfo();
1917 NameLoc = ConsumeToken();
1918 LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
1919 RParenLoc = PP.getLocForEndOfToken(NameLoc);
1920 Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
1922 << FixItHint::CreateInsertion(LParenLoc, "(")
1923 << FixItHint::CreateInsertion(RParenLoc, ")");
1925 Diag(Tok, diag::err_sizeof_parameter_pack);
1931 EnterExpressionEvaluationContext Unevaluated(
1932 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
1933 Sema::ReuseLambdaContextDecl);
1935 return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
1936 OpTok.getLocation(),
1941 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
1942 Diag(OpTok, diag::warn_cxx98_compat_alignof);
1944 EnterExpressionEvaluationContext Unevaluated(
1945 Actions, Sema::ExpressionEvaluationContext::Unevaluated,
1946 Sema::ReuseLambdaContextDecl);
1950 SourceRange CastRange;
1951 ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
1956 UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
1957 if (OpTok.isOneOf(tok::kw_alignof, tok::kw___alignof, tok::kw__Alignof))
1958 ExprKind = UETT_AlignOf;
1959 else if (OpTok.is(tok::kw_vec_step))
1960 ExprKind = UETT_VecStep;
1961 else if (OpTok.is(tok::kw___builtin_omp_required_simd_align))
1962 ExprKind = UETT_OpenMPRequiredSimdAlign;
1965 return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1968 CastTy.getAsOpaquePtr(),
1971 if (OpTok.isOneOf(tok::kw_alignof, tok::kw__Alignof))
1972 Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
1974 // If we get here, the operand to the sizeof/alignof was an expresion.
1975 if (!Operand.isInvalid())
1976 Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
1984 /// ParseBuiltinPrimaryExpression
1987 /// primary-expression: [C99 6.5.1]
1988 /// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
1989 /// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
1990 /// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
1992 /// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
1993 /// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
1995 /// [GNU] offsetof-member-designator:
1996 /// [GNU] identifier
1997 /// [GNU] offsetof-member-designator '.' identifier
1998 /// [GNU] offsetof-member-designator '[' expression ']'
2000 ExprResult Parser::ParseBuiltinPrimaryExpression() {
2002 const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
2004 tok::TokenKind T = Tok.getKind();
2005 SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
2007 // All of these start with an open paren.
2008 if (Tok.isNot(tok::l_paren))
2009 return ExprError(Diag(Tok, diag::err_expected_after) << BuiltinII
2012 BalancedDelimiterTracker PT(*this, tok::l_paren);
2018 default: llvm_unreachable("Not a builtin primary expression!");
2019 case tok::kw___builtin_va_arg: {
2020 ExprResult Expr(ParseAssignmentExpression());
2022 if (ExpectAndConsume(tok::comma)) {
2023 SkipUntil(tok::r_paren, StopAtSemi);
2027 TypeResult Ty = ParseTypeName();
2029 if (Tok.isNot(tok::r_paren)) {
2030 Diag(Tok, diag::err_expected) << tok::r_paren;
2034 if (Expr.isInvalid() || Ty.isInvalid())
2037 Res = Actions.ActOnVAArg(StartLoc, Expr.get(), Ty.get(), ConsumeParen());
2040 case tok::kw___builtin_offsetof: {
2041 SourceLocation TypeLoc = Tok.getLocation();
2042 TypeResult Ty = ParseTypeName();
2043 if (Ty.isInvalid()) {
2044 SkipUntil(tok::r_paren, StopAtSemi);
2048 if (ExpectAndConsume(tok::comma)) {
2049 SkipUntil(tok::r_paren, StopAtSemi);
2053 // We must have at least one identifier here.
2054 if (Tok.isNot(tok::identifier)) {
2055 Diag(Tok, diag::err_expected) << tok::identifier;
2056 SkipUntil(tok::r_paren, StopAtSemi);
2060 // Keep track of the various subcomponents we see.
2061 SmallVector<Sema::OffsetOfComponent, 4> Comps;
2063 Comps.push_back(Sema::OffsetOfComponent());
2064 Comps.back().isBrackets = false;
2065 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2066 Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
2068 // FIXME: This loop leaks the index expressions on error.
2070 if (Tok.is(tok::period)) {
2071 // offsetof-member-designator: offsetof-member-designator '.' identifier
2072 Comps.push_back(Sema::OffsetOfComponent());
2073 Comps.back().isBrackets = false;
2074 Comps.back().LocStart = ConsumeToken();
2076 if (Tok.isNot(tok::identifier)) {
2077 Diag(Tok, diag::err_expected) << tok::identifier;
2078 SkipUntil(tok::r_paren, StopAtSemi);
2081 Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
2082 Comps.back().LocEnd = ConsumeToken();
2084 } else if (Tok.is(tok::l_square)) {
2085 if (CheckProhibitedCXX11Attribute())
2088 // offsetof-member-designator: offsetof-member-design '[' expression ']'
2089 Comps.push_back(Sema::OffsetOfComponent());
2090 Comps.back().isBrackets = true;
2091 BalancedDelimiterTracker ST(*this, tok::l_square);
2093 Comps.back().LocStart = ST.getOpenLocation();
2094 Res = ParseExpression();
2095 if (Res.isInvalid()) {
2096 SkipUntil(tok::r_paren, StopAtSemi);
2099 Comps.back().U.E = Res.get();
2102 Comps.back().LocEnd = ST.getCloseLocation();
2104 if (Tok.isNot(tok::r_paren)) {
2107 } else if (Ty.isInvalid()) {
2111 Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
2113 PT.getCloseLocation());
2120 case tok::kw___builtin_choose_expr: {
2121 ExprResult Cond(ParseAssignmentExpression());
2122 if (Cond.isInvalid()) {
2123 SkipUntil(tok::r_paren, StopAtSemi);
2126 if (ExpectAndConsume(tok::comma)) {
2127 SkipUntil(tok::r_paren, StopAtSemi);
2131 ExprResult Expr1(ParseAssignmentExpression());
2132 if (Expr1.isInvalid()) {
2133 SkipUntil(tok::r_paren, StopAtSemi);
2136 if (ExpectAndConsume(tok::comma)) {
2137 SkipUntil(tok::r_paren, StopAtSemi);
2141 ExprResult Expr2(ParseAssignmentExpression());
2142 if (Expr2.isInvalid()) {
2143 SkipUntil(tok::r_paren, StopAtSemi);
2146 if (Tok.isNot(tok::r_paren)) {
2147 Diag(Tok, diag::err_expected) << tok::r_paren;
2150 Res = Actions.ActOnChooseExpr(StartLoc, Cond.get(), Expr1.get(),
2151 Expr2.get(), ConsumeParen());
2154 case tok::kw___builtin_astype: {
2155 // The first argument is an expression to be converted, followed by a comma.
2156 ExprResult Expr(ParseAssignmentExpression());
2157 if (Expr.isInvalid()) {
2158 SkipUntil(tok::r_paren, StopAtSemi);
2162 if (ExpectAndConsume(tok::comma)) {
2163 SkipUntil(tok::r_paren, StopAtSemi);
2167 // Second argument is the type to bitcast to.
2168 TypeResult DestTy = ParseTypeName();
2169 if (DestTy.isInvalid())
2172 // Attempt to consume the r-paren.
2173 if (Tok.isNot(tok::r_paren)) {
2174 Diag(Tok, diag::err_expected) << tok::r_paren;
2175 SkipUntil(tok::r_paren, StopAtSemi);
2179 Res = Actions.ActOnAsTypeExpr(Expr.get(), DestTy.get(), StartLoc,
2183 case tok::kw___builtin_convertvector: {
2184 // The first argument is an expression to be converted, followed by a comma.
2185 ExprResult Expr(ParseAssignmentExpression());
2186 if (Expr.isInvalid()) {
2187 SkipUntil(tok::r_paren, StopAtSemi);
2191 if (ExpectAndConsume(tok::comma)) {
2192 SkipUntil(tok::r_paren, StopAtSemi);
2196 // Second argument is the type to bitcast to.
2197 TypeResult DestTy = ParseTypeName();
2198 if (DestTy.isInvalid())
2201 // Attempt to consume the r-paren.
2202 if (Tok.isNot(tok::r_paren)) {
2203 Diag(Tok, diag::err_expected) << tok::r_paren;
2204 SkipUntil(tok::r_paren, StopAtSemi);
2208 Res = Actions.ActOnConvertVectorExpr(Expr.get(), DestTy.get(), StartLoc,
2214 if (Res.isInvalid())
2217 // These can be followed by postfix-expr pieces because they are
2218 // primary-expressions.
2219 return ParsePostfixExpressionSuffix(Res.get());
2222 /// ParseParenExpression - This parses the unit that starts with a '(' token,
2223 /// based on what is allowed by ExprType. The actual thing parsed is returned
2224 /// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
2225 /// not the parsed cast-expression.
2228 /// primary-expression: [C99 6.5.1]
2229 /// '(' expression ')'
2230 /// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
2231 /// postfix-expression: [C99 6.5.2]
2232 /// '(' type-name ')' '{' initializer-list '}'
2233 /// '(' type-name ')' '{' initializer-list ',' '}'
2234 /// cast-expression: [C99 6.5.4]
2235 /// '(' type-name ')' cast-expression
2236 /// [ARC] bridged-cast-expression
2237 /// [ARC] bridged-cast-expression:
2238 /// (__bridge type-name) cast-expression
2239 /// (__bridge_transfer type-name) cast-expression
2240 /// (__bridge_retained type-name) cast-expression
2241 /// fold-expression: [C++1z]
2242 /// '(' cast-expression fold-operator '...' ')'
2243 /// '(' '...' fold-operator cast-expression ')'
2244 /// '(' cast-expression fold-operator '...'
2245 /// fold-operator cast-expression ')'
2248 Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
2249 bool isTypeCast, ParsedType &CastTy,
2250 SourceLocation &RParenLoc) {
2251 assert(Tok.is(tok::l_paren) && "Not a paren expr!");
2252 ColonProtectionRAIIObject ColonProtection(*this, false);
2253 BalancedDelimiterTracker T(*this, tok::l_paren);
2254 if (T.consumeOpen())
2256 SourceLocation OpenLoc = T.getOpenLocation();
2258 ExprResult Result(true);
2259 bool isAmbiguousTypeId;
2262 if (Tok.is(tok::code_completion)) {
2263 Actions.CodeCompleteOrdinaryName(getCurScope(),
2264 ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression
2265 : Sema::PCC_Expression);
2270 // Diagnose use of bridge casts in non-arc mode.
2271 bool BridgeCast = (getLangOpts().ObjC2 &&
2272 Tok.isOneOf(tok::kw___bridge,
2273 tok::kw___bridge_transfer,
2274 tok::kw___bridge_retained,
2275 tok::kw___bridge_retain));
2276 if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
2277 if (!TryConsumeToken(tok::kw___bridge)) {
2278 StringRef BridgeCastName = Tok.getName();
2279 SourceLocation BridgeKeywordLoc = ConsumeToken();
2280 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2281 Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
2283 << FixItHint::CreateReplacement(BridgeKeywordLoc, "");
2288 // None of these cases should fall through with an invalid Result
2289 // unless they've already reported an error.
2290 if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
2291 Diag(Tok, diag::ext_gnu_statement_expr);
2293 if (!getCurScope()->getFnParent() && !getCurScope()->getBlockParent()) {
2294 Result = ExprError(Diag(OpenLoc, diag::err_stmtexpr_file_scope));
2296 // Find the nearest non-record decl context. Variables declared in a
2297 // statement expression behave as if they were declared in the enclosing
2298 // function, block, or other code construct.
2299 DeclContext *CodeDC = Actions.CurContext;
2300 while (CodeDC->isRecord() || isa<EnumDecl>(CodeDC)) {
2301 CodeDC = CodeDC->getParent();
2302 assert(CodeDC && !CodeDC->isFileContext() &&
2303 "statement expr not in code context");
2305 Sema::ContextRAII SavedContext(Actions, CodeDC, /*NewThisContext=*/false);
2307 Actions.ActOnStartStmtExpr();
2309 StmtResult Stmt(ParseCompoundStatement(true));
2310 ExprType = CompoundStmt;
2312 // If the substmt parsed correctly, build the AST node.
2313 if (!Stmt.isInvalid()) {
2314 Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.get(), Tok.getLocation());
2316 Actions.ActOnStmtExprError();
2319 } else if (ExprType >= CompoundLiteral && BridgeCast) {
2320 tok::TokenKind tokenKind = Tok.getKind();
2321 SourceLocation BridgeKeywordLoc = ConsumeToken();
2323 // Parse an Objective-C ARC ownership cast expression.
2324 ObjCBridgeCastKind Kind;
2325 if (tokenKind == tok::kw___bridge)
2327 else if (tokenKind == tok::kw___bridge_transfer)
2328 Kind = OBC_BridgeTransfer;
2329 else if (tokenKind == tok::kw___bridge_retained)
2330 Kind = OBC_BridgeRetained;
2332 // As a hopefully temporary workaround, allow __bridge_retain as
2333 // a synonym for __bridge_retained, but only in system headers.
2334 assert(tokenKind == tok::kw___bridge_retain);
2335 Kind = OBC_BridgeRetained;
2336 if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
2337 Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
2338 << FixItHint::CreateReplacement(BridgeKeywordLoc,
2339 "__bridge_retained");
2342 TypeResult Ty = ParseTypeName();
2344 ColonProtection.restore();
2345 RParenLoc = T.getCloseLocation();
2346 ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false);
2348 if (Ty.isInvalid() || SubExpr.isInvalid())
2351 return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
2352 BridgeKeywordLoc, Ty.get(),
2353 RParenLoc, SubExpr.get());
2354 } else if (ExprType >= CompoundLiteral &&
2355 isTypeIdInParens(isAmbiguousTypeId)) {
2357 // Otherwise, this is a compound literal expression or cast expression.
2359 // In C++, if the type-id is ambiguous we disambiguate based on context.
2360 // If stopIfCastExpr is true the context is a typeof/sizeof/alignof
2361 // in which case we should treat it as type-id.
2362 // if stopIfCastExpr is false, we need to determine the context past the
2363 // parens, so we defer to ParseCXXAmbiguousParenExpression for that.
2364 if (isAmbiguousTypeId && !stopIfCastExpr) {
2365 ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T,
2367 RParenLoc = T.getCloseLocation();
2371 // Parse the type declarator.
2372 DeclSpec DS(AttrFactory);
2373 ParseSpecifierQualifierList(DS);
2374 Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
2375 ParseDeclarator(DeclaratorInfo);
2377 // If our type is followed by an identifier and either ':' or ']', then
2378 // this is probably an Objective-C message send where the leading '[' is
2379 // missing. Recover as if that were the case.
2380 if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
2381 !InMessageExpression && getLangOpts().ObjC1 &&
2382 (NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
2385 InMessageExpressionRAIIObject InMessage(*this, false);
2386 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2388 Result = ParseObjCMessageExpressionBody(SourceLocation(),
2394 ColonProtection.restore();
2395 RParenLoc = T.getCloseLocation();
2396 if (Tok.is(tok::l_brace)) {
2397 ExprType = CompoundLiteral;
2400 InMessageExpressionRAIIObject InMessage(*this, false);
2401 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2403 return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
2406 if (Tok.is(tok::l_paren)) {
2407 // This could be OpenCL vector Literals
2408 if (getLangOpts().OpenCL)
2412 InMessageExpressionRAIIObject InMessage(*this, false);
2413 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2419 QualType QT = Ty.get().get().getCanonicalType();
2420 if (QT->isVectorType())
2422 // We parsed '(' vector-type-name ')' followed by '('
2424 // Parse the cast-expression that follows it next.
2425 // isVectorLiteral = true will make sure we don't parse any
2426 // Postfix expression yet
2427 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2428 /*isAddressOfOperand=*/false,
2429 /*isTypeCast=*/IsTypeCast,
2430 /*isVectorLiteral=*/true);
2432 if (!Result.isInvalid()) {
2433 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2434 DeclaratorInfo, CastTy,
2435 RParenLoc, Result.get());
2438 // After we performed the cast we can check for postfix-expr pieces.
2439 if (!Result.isInvalid()) {
2440 Result = ParsePostfixExpressionSuffix(Result);
2448 if (ExprType == CastExpr) {
2449 // We parsed '(' type-name ')' and the thing after it wasn't a '{'.
2451 if (DeclaratorInfo.isInvalidType())
2454 // Note that this doesn't parse the subsequent cast-expression, it just
2455 // returns the parsed type to the callee.
2456 if (stopIfCastExpr) {
2459 InMessageExpressionRAIIObject InMessage(*this, false);
2460 Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
2463 return ExprResult();
2466 // Reject the cast of super idiom in ObjC.
2467 if (Tok.is(tok::identifier) && getLangOpts().ObjC1 &&
2468 Tok.getIdentifierInfo() == Ident_super &&
2469 getCurScope()->isInObjcMethodScope() &&
2470 GetLookAheadToken(1).isNot(tok::period)) {
2471 Diag(Tok.getLocation(), diag::err_illegal_super_cast)
2472 << SourceRange(OpenLoc, RParenLoc);
2476 // Parse the cast-expression that follows it next.
2477 // TODO: For cast expression with CastTy.
2478 Result = ParseCastExpression(/*isUnaryExpression=*/false,
2479 /*isAddressOfOperand=*/false,
2480 /*isTypeCast=*/IsTypeCast);
2481 if (!Result.isInvalid()) {
2482 Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
2483 DeclaratorInfo, CastTy,
2484 RParenLoc, Result.get());
2489 Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
2492 } else if (Tok.is(tok::ellipsis) &&
2493 isFoldOperator(NextToken().getKind())) {
2494 return ParseFoldExpression(ExprResult(), T);
2495 } else if (isTypeCast) {
2496 // Parse the expression-list.
2497 InMessageExpressionRAIIObject InMessage(*this, false);
2499 ExprVector ArgExprs;
2500 CommaLocsTy CommaLocs;
2502 if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
2503 // FIXME: If we ever support comma expressions as operands to
2504 // fold-expressions, we'll need to allow multiple ArgExprs here.
2505 if (ArgExprs.size() == 1 && isFoldOperator(Tok.getKind()) &&
2506 NextToken().is(tok::ellipsis))
2507 return ParseFoldExpression(ArgExprs[0], T);
2509 ExprType = SimpleExpr;
2510 Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
2514 InMessageExpressionRAIIObject InMessage(*this, false);
2516 Result = ParseExpression(MaybeTypeCast);
2517 if (!getLangOpts().CPlusPlus && MaybeTypeCast && Result.isUsable()) {
2518 // Correct typos in non-C++ code earlier so that implicit-cast-like
2519 // expressions are parsed correctly.
2520 Result = Actions.CorrectDelayedTyposInExpr(Result);
2522 ExprType = SimpleExpr;
2524 if (isFoldOperator(Tok.getKind()) && NextToken().is(tok::ellipsis))
2525 return ParseFoldExpression(Result, T);
2527 // Don't build a paren expression unless we actually match a ')'.
2528 if (!Result.isInvalid() && Tok.is(tok::r_paren))
2530 Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.get());
2534 if (Result.isInvalid()) {
2535 SkipUntil(tok::r_paren, StopAtSemi);
2540 RParenLoc = T.getCloseLocation();
2544 /// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
2545 /// and we are at the left brace.
2548 /// postfix-expression: [C99 6.5.2]
2549 /// '(' type-name ')' '{' initializer-list '}'
2550 /// '(' type-name ')' '{' initializer-list ',' '}'
2553 Parser::ParseCompoundLiteralExpression(ParsedType Ty,
2554 SourceLocation LParenLoc,
2555 SourceLocation RParenLoc) {
2556 assert(Tok.is(tok::l_brace) && "Not a compound literal!");
2557 if (!getLangOpts().C99) // Compound literals don't exist in C90.
2558 Diag(LParenLoc, diag::ext_c99_compound_literal);
2559 ExprResult Result = ParseInitializer();
2560 if (!Result.isInvalid() && Ty)
2561 return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.get());
2565 /// ParseStringLiteralExpression - This handles the various token types that
2566 /// form string literals, and also handles string concatenation [C99 5.1.1.2,
2567 /// translation phase #6].
2570 /// primary-expression: [C99 6.5.1]
2573 ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
2574 assert(isTokenStringLiteral() && "Not a string literal!");
2576 // String concat. Note that keywords like __func__ and __FUNCTION__ are not
2577 // considered to be strings for concatenation purposes.
2578 SmallVector<Token, 4> StringToks;
2581 StringToks.push_back(Tok);
2582 ConsumeStringToken();
2583 } while (isTokenStringLiteral());
2585 // Pass the set of string tokens, ready for concatenation, to the actions.
2586 return Actions.ActOnStringLiteral(StringToks,
2587 AllowUserDefinedLiteral ? getCurScope()
2591 /// ParseGenericSelectionExpression - Parse a C11 generic-selection
2595 /// generic-selection:
2596 /// _Generic ( assignment-expression , generic-assoc-list )
2597 /// generic-assoc-list:
2598 /// generic-association
2599 /// generic-assoc-list , generic-association
2600 /// generic-association:
2601 /// type-name : assignment-expression
2602 /// default : assignment-expression
2604 ExprResult Parser::ParseGenericSelectionExpression() {
2605 assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
2606 SourceLocation KeyLoc = ConsumeToken();
2608 if (!getLangOpts().C11)
2609 Diag(KeyLoc, diag::ext_c11_generic_selection);
2611 BalancedDelimiterTracker T(*this, tok::l_paren);
2612 if (T.expectAndConsume())
2615 ExprResult ControllingExpr;
2617 // C11 6.5.1.1p3 "The controlling expression of a generic selection is
2619 EnterExpressionEvaluationContext Unevaluated(
2620 Actions, Sema::ExpressionEvaluationContext::Unevaluated);
2622 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression());
2623 if (ControllingExpr.isInvalid()) {
2624 SkipUntil(tok::r_paren, StopAtSemi);
2629 if (ExpectAndConsume(tok::comma)) {
2630 SkipUntil(tok::r_paren, StopAtSemi);
2634 SourceLocation DefaultLoc;
2639 if (Tok.is(tok::kw_default)) {
2640 // C11 6.5.1.1p2 "A generic selection shall have no more than one default
2641 // generic association."
2642 if (!DefaultLoc.isInvalid()) {
2643 Diag(Tok, diag::err_duplicate_default_assoc);
2644 Diag(DefaultLoc, diag::note_previous_default_assoc);
2645 SkipUntil(tok::r_paren, StopAtSemi);
2648 DefaultLoc = ConsumeToken();
2651 ColonProtectionRAIIObject X(*this);
2652 TypeResult TR = ParseTypeName();
2653 if (TR.isInvalid()) {
2654 SkipUntil(tok::r_paren, StopAtSemi);
2659 Types.push_back(Ty);
2661 if (ExpectAndConsume(tok::colon)) {
2662 SkipUntil(tok::r_paren, StopAtSemi);
2666 // FIXME: These expressions should be parsed in a potentially potentially
2667 // evaluated context.
2669 Actions.CorrectDelayedTyposInExpr(ParseAssignmentExpression()));
2670 if (ER.isInvalid()) {
2671 SkipUntil(tok::r_paren, StopAtSemi);
2674 Exprs.push_back(ER.get());
2675 } while (TryConsumeToken(tok::comma));
2678 if (T.getCloseLocation().isInvalid())
2681 return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
2682 T.getCloseLocation(),
2683 ControllingExpr.get(),
2687 /// \brief Parse A C++1z fold-expression after the opening paren and optional
2688 /// left-hand-side expression.
2691 /// fold-expression:
2692 /// ( cast-expression fold-operator ... )
2693 /// ( ... fold-operator cast-expression )
2694 /// ( cast-expression fold-operator ... fold-operator cast-expression )
2695 ExprResult Parser::ParseFoldExpression(ExprResult LHS,
2696 BalancedDelimiterTracker &T) {
2697 if (LHS.isInvalid()) {
2702 tok::TokenKind Kind = tok::unknown;
2703 SourceLocation FirstOpLoc;
2704 if (LHS.isUsable()) {
2705 Kind = Tok.getKind();
2706 assert(isFoldOperator(Kind) && "missing fold-operator");
2707 FirstOpLoc = ConsumeToken();
2710 assert(Tok.is(tok::ellipsis) && "not a fold-expression");
2711 SourceLocation EllipsisLoc = ConsumeToken();
2714 if (Tok.isNot(tok::r_paren)) {
2715 if (!isFoldOperator(Tok.getKind()))
2716 return Diag(Tok.getLocation(), diag::err_expected_fold_operator);
2718 if (Kind != tok::unknown && Tok.getKind() != Kind)
2719 Diag(Tok.getLocation(), diag::err_fold_operator_mismatch)
2720 << SourceRange(FirstOpLoc);
2721 Kind = Tok.getKind();
2724 RHS = ParseExpression();
2725 if (RHS.isInvalid()) {
2731 Diag(EllipsisLoc, getLangOpts().CPlusPlus1z
2732 ? diag::warn_cxx14_compat_fold_expression
2733 : diag::ext_fold_expression);
2736 return Actions.ActOnCXXFoldExpr(T.getOpenLocation(), LHS.get(), Kind,
2737 EllipsisLoc, RHS.get(), T.getCloseLocation());
2740 /// ParseExpressionList - Used for C/C++ (argument-)expression-list.
2743 /// argument-expression-list:
2744 /// assignment-expression
2745 /// argument-expression-list , assignment-expression
2747 /// [C++] expression-list:
2748 /// [C++] assignment-expression
2749 /// [C++] expression-list , assignment-expression
2751 /// [C++0x] expression-list:
2752 /// [C++0x] initializer-list
2754 /// [C++0x] initializer-list
2755 /// [C++0x] initializer-clause ...[opt]
2756 /// [C++0x] initializer-list , initializer-clause ...[opt]
2758 /// [C++0x] initializer-clause:
2759 /// [C++0x] assignment-expression
2760 /// [C++0x] braced-init-list
2762 bool Parser::ParseExpressionList(SmallVectorImpl<Expr *> &Exprs,
2763 SmallVectorImpl<SourceLocation> &CommaLocs,
2764 std::function<void()> Completer) {
2765 bool SawError = false;
2767 if (Tok.is(tok::code_completion)) {
2771 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
2777 if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
2778 Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
2779 Expr = ParseBraceInitializer();
2781 Expr = ParseAssignmentExpression();
2783 if (Tok.is(tok::ellipsis))
2784 Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
2785 if (Expr.isInvalid()) {
2786 SkipUntil(tok::comma, tok::r_paren, StopBeforeMatch);
2789 Exprs.push_back(Expr.get());
2792 if (Tok.isNot(tok::comma))
2794 // Move to the next argument, remember where the comma was.
2795 CommaLocs.push_back(ConsumeToken());
2798 // Ensure typos get diagnosed when errors were encountered while parsing the
2800 for (auto &E : Exprs) {
2801 ExprResult Expr = Actions.CorrectDelayedTyposInExpr(E);
2802 if (Expr.isUsable()) E = Expr.get();
2808 /// ParseSimpleExpressionList - A simple comma-separated list of expressions,
2809 /// used for misc language extensions.
2812 /// simple-expression-list:
2813 /// assignment-expression
2814 /// simple-expression-list , assignment-expression
2817 Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
2818 SmallVectorImpl<SourceLocation> &CommaLocs) {
2820 ExprResult Expr = ParseAssignmentExpression();
2821 if (Expr.isInvalid())
2824 Exprs.push_back(Expr.get());
2826 if (Tok.isNot(tok::comma))
2829 // Move to the next argument, remember where the comma was.
2830 CommaLocs.push_back(ConsumeToken());
2834 /// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
2837 /// [clang] block-id:
2838 /// [clang] specifier-qualifier-list block-declarator
2840 void Parser::ParseBlockId(SourceLocation CaretLoc) {
2841 if (Tok.is(tok::code_completion)) {
2842 Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
2843 return cutOffParsing();
2846 // Parse the specifier-qualifier-list piece.
2847 DeclSpec DS(AttrFactory);
2848 ParseSpecifierQualifierList(DS);
2850 // Parse the block-declarator.
2851 Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext);
2852 DeclaratorInfo.setFunctionDefinitionKind(FDK_Definition);
2853 ParseDeclarator(DeclaratorInfo);
2855 MaybeParseGNUAttributes(DeclaratorInfo);
2857 // Inform sema that we are starting a block.
2858 Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
2861 /// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
2862 /// like ^(int x){ return x+1; }
2866 /// [clang] '^' block-args[opt] compound-statement
2867 /// [clang] '^' block-id compound-statement
2868 /// [clang] block-args:
2869 /// [clang] '(' parameter-list ')'
2871 ExprResult Parser::ParseBlockLiteralExpression() {
2872 assert(Tok.is(tok::caret) && "block literal starts with ^");
2873 SourceLocation CaretLoc = ConsumeToken();
2875 PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
2876 "block literal parsing");
2878 // Enter a scope to hold everything within the block. This includes the
2879 // argument decls, decls within the compound expression, etc. This also
2880 // allows determining whether a variable reference inside the block is
2881 // within or outside of the block.
2882 ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
2885 // Inform sema that we are starting a block.
2886 Actions.ActOnBlockStart(CaretLoc, getCurScope());
2888 // Parse the return type if present.
2889 DeclSpec DS(AttrFactory);
2890 Declarator ParamInfo(DS, Declarator::BlockLiteralContext);
2891 ParamInfo.setFunctionDefinitionKind(FDK_Definition);
2892 // FIXME: Since the return type isn't actually parsed, it can't be used to
2893 // fill ParamInfo with an initial valid range, so do it manually.
2894 ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
2896 // If this block has arguments, parse them. There is no ambiguity here with
2897 // the expression case, because the expression case requires a parameter list.
2898 if (Tok.is(tok::l_paren)) {
2899 ParseParenDeclarator(ParamInfo);
2900 // Parse the pieces after the identifier as if we had "int(...)".
2901 // SetIdentifier sets the source range end, but in this case we're past
2903 SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
2904 ParamInfo.SetIdentifier(nullptr, CaretLoc);
2905 ParamInfo.SetRangeEnd(Tmp);
2906 if (ParamInfo.isInvalidType()) {
2907 // If there was an error parsing the arguments, they may have
2908 // tried to use ^(x+y) which requires an argument list. Just
2909 // skip the whole block literal.
2910 Actions.ActOnBlockError(CaretLoc, getCurScope());
2914 MaybeParseGNUAttributes(ParamInfo);
2916 // Inform sema that we are starting a block.
2917 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2918 } else if (!Tok.is(tok::l_brace)) {
2919 ParseBlockId(CaretLoc);
2921 // Otherwise, pretend we saw (void).
2922 ParsedAttributes attrs(AttrFactory);
2923 SourceLocation NoLoc;
2924 ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true,
2925 /*IsAmbiguous=*/false,
2926 /*RParenLoc=*/NoLoc,
2927 /*ArgInfo=*/nullptr,
2929 /*EllipsisLoc=*/NoLoc,
2930 /*RParenLoc=*/NoLoc,
2932 /*RefQualifierIsLvalueRef=*/true,
2933 /*RefQualifierLoc=*/NoLoc,
2934 /*ConstQualifierLoc=*/NoLoc,
2935 /*VolatileQualifierLoc=*/NoLoc,
2936 /*RestrictQualifierLoc=*/NoLoc,
2937 /*MutableLoc=*/NoLoc,
2939 /*ESpecRange=*/SourceRange(),
2940 /*Exceptions=*/nullptr,
2941 /*ExceptionRanges=*/nullptr,
2942 /*NumExceptions=*/0,
2943 /*NoexceptExpr=*/nullptr,
2944 /*ExceptionSpecTokens=*/nullptr,
2945 /*DeclsInPrototype=*/None,
2950 MaybeParseGNUAttributes(ParamInfo);
2952 // Inform sema that we are starting a block.
2953 Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
2957 ExprResult Result(true);
2958 if (!Tok.is(tok::l_brace)) {
2959 // Saw something like: ^expr
2960 Diag(Tok, diag::err_expected_expression);
2961 Actions.ActOnBlockError(CaretLoc, getCurScope());
2965 StmtResult Stmt(ParseCompoundStatementBody());
2967 if (!Stmt.isInvalid())
2968 Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.get(), getCurScope());
2970 Actions.ActOnBlockError(CaretLoc, getCurScope());
2974 /// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
2978 ExprResult Parser::ParseObjCBoolLiteral() {
2979 tok::TokenKind Kind = Tok.getKind();
2980 return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);
2983 /// Validate availability spec list, emitting diagnostics if necessary. Returns
2984 /// true if invalid.
2985 static bool CheckAvailabilitySpecList(Parser &P,
2986 ArrayRef<AvailabilitySpec> AvailSpecs) {
2987 llvm::SmallSet<StringRef, 4> Platforms;
2988 bool HasOtherPlatformSpec = false;
2990 for (const auto &Spec : AvailSpecs) {
2991 if (Spec.isOtherPlatformSpec()) {
2992 if (HasOtherPlatformSpec) {
2993 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_star);
2997 HasOtherPlatformSpec = true;
3001 bool Inserted = Platforms.insert(Spec.getPlatform()).second;
3003 // Rule out multiple version specs referring to the same platform.
3004 // For example, we emit an error for:
3005 // @available(macos 10.10, macos 10.11, *)
3006 StringRef Platform = Spec.getPlatform();
3007 P.Diag(Spec.getBeginLoc(), diag::err_availability_query_repeated_platform)
3008 << Spec.getEndLoc() << Platform;
3013 if (!HasOtherPlatformSpec) {
3014 SourceLocation InsertWildcardLoc = AvailSpecs.back().getEndLoc();
3015 P.Diag(InsertWildcardLoc, diag::err_availability_query_wildcard_required)
3016 << FixItHint::CreateInsertion(InsertWildcardLoc, ", *");
3023 /// Parse availability query specification.
3025 /// availability-spec:
3027 /// identifier version-tuple
3028 Optional<AvailabilitySpec> Parser::ParseAvailabilitySpec() {
3029 if (Tok.is(tok::star)) {
3030 return AvailabilitySpec(ConsumeToken());
3032 // Parse the platform name.
3033 if (Tok.is(tok::code_completion)) {
3034 Actions.CodeCompleteAvailabilityPlatformName();
3038 if (Tok.isNot(tok::identifier)) {
3039 Diag(Tok, diag::err_avail_query_expected_platform_name);
3043 IdentifierLoc *PlatformIdentifier = ParseIdentifierLoc();
3044 SourceRange VersionRange;
3045 VersionTuple Version = ParseVersionTuple(VersionRange);
3047 if (Version.empty())
3050 StringRef GivenPlatform = PlatformIdentifier->Ident->getName();
3051 StringRef Platform =
3052 AvailabilityAttr::canonicalizePlatformName(GivenPlatform);
3054 if (AvailabilityAttr::getPrettyPlatformName(Platform).empty()) {
3055 Diag(PlatformIdentifier->Loc,
3056 diag::err_avail_query_unrecognized_platform_name)
3061 return AvailabilitySpec(Version, Platform, PlatformIdentifier->Loc,
3062 VersionRange.getEnd());
3066 ExprResult Parser::ParseAvailabilityCheckExpr(SourceLocation BeginLoc) {
3067 assert(Tok.is(tok::kw___builtin_available) ||
3068 Tok.isObjCAtKeyword(tok::objc_available));
3070 // Eat the available or __builtin_available.
3073 BalancedDelimiterTracker Parens(*this, tok::l_paren);
3074 if (Parens.expectAndConsume())
3077 SmallVector<AvailabilitySpec, 4> AvailSpecs;
3078 bool HasError = false;
3080 Optional<AvailabilitySpec> Spec = ParseAvailabilitySpec();
3084 AvailSpecs.push_back(*Spec);
3086 if (!TryConsumeToken(tok::comma))
3091 SkipUntil(tok::r_paren, StopAtSemi);
3095 CheckAvailabilitySpecList(*this, AvailSpecs);
3097 if (Parens.consumeClose())
3100 return Actions.ActOnObjCAvailabilityCheckExpr(AvailSpecs, BeginLoc,
3101 Parens.getCloseLocation());