2608 lines
98 KiB
C++
2608 lines
98 KiB
C++
//===--- ParseExpr.cpp - Expression Parsing -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief Provides the Expression parsing implementation.
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///
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/// Expressions in C99 basically consist of a bunch of binary operators with
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/// unary operators and other random stuff at the leaves.
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///
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/// In the C99 grammar, these unary operators bind tightest and are represented
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/// as the 'cast-expression' production. Everything else is either a binary
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/// operator (e.g. '/') or a ternary operator ("?:"). The unary leaves are
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/// handled by ParseCastExpression, the higher level pieces are handled by
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/// ParseBinaryExpression.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/Parse/Parser.h"
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#include "RAIIObjectsForParser.h"
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#include "clang/Basic/PrettyStackTrace.h"
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#include "clang/Sema/DeclSpec.h"
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#include "clang/Sema/ParsedTemplate.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Sema/TypoCorrection.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace clang;
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/// \brief Simple precedence-based parser for binary/ternary operators.
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///
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/// Note: we diverge from the C99 grammar when parsing the assignment-expression
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/// production. C99 specifies that the LHS of an assignment operator should be
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/// parsed as a unary-expression, but consistency dictates that it be a
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/// conditional-expession. In practice, the important thing here is that the
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/// LHS of an assignment has to be an l-value, which productions between
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/// unary-expression and conditional-expression don't produce. Because we want
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/// consistency, we parse the LHS as a conditional-expression, then check for
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/// l-value-ness in semantic analysis stages.
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///
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/// \verbatim
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/// pm-expression: [C++ 5.5]
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/// cast-expression
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/// pm-expression '.*' cast-expression
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/// pm-expression '->*' cast-expression
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///
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/// multiplicative-expression: [C99 6.5.5]
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/// Note: in C++, apply pm-expression instead of cast-expression
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/// cast-expression
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/// multiplicative-expression '*' cast-expression
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/// multiplicative-expression '/' cast-expression
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/// multiplicative-expression '%' cast-expression
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///
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/// additive-expression: [C99 6.5.6]
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/// multiplicative-expression
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/// additive-expression '+' multiplicative-expression
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/// additive-expression '-' multiplicative-expression
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///
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/// shift-expression: [C99 6.5.7]
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/// additive-expression
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/// shift-expression '<<' additive-expression
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/// shift-expression '>>' additive-expression
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///
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/// relational-expression: [C99 6.5.8]
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/// shift-expression
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/// relational-expression '<' shift-expression
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/// relational-expression '>' shift-expression
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/// relational-expression '<=' shift-expression
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/// relational-expression '>=' shift-expression
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///
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/// equality-expression: [C99 6.5.9]
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/// relational-expression
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/// equality-expression '==' relational-expression
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/// equality-expression '!=' relational-expression
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///
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/// AND-expression: [C99 6.5.10]
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/// equality-expression
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/// AND-expression '&' equality-expression
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///
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/// exclusive-OR-expression: [C99 6.5.11]
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/// AND-expression
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/// exclusive-OR-expression '^' AND-expression
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///
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/// inclusive-OR-expression: [C99 6.5.12]
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/// exclusive-OR-expression
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/// inclusive-OR-expression '|' exclusive-OR-expression
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///
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/// logical-AND-expression: [C99 6.5.13]
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/// inclusive-OR-expression
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/// logical-AND-expression '&&' inclusive-OR-expression
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///
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/// logical-OR-expression: [C99 6.5.14]
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/// logical-AND-expression
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/// logical-OR-expression '||' logical-AND-expression
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///
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/// conditional-expression: [C99 6.5.15]
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/// logical-OR-expression
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/// logical-OR-expression '?' expression ':' conditional-expression
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/// [GNU] logical-OR-expression '?' ':' conditional-expression
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/// [C++] the third operand is an assignment-expression
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///
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/// assignment-expression: [C99 6.5.16]
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/// conditional-expression
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/// unary-expression assignment-operator assignment-expression
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/// [C++] throw-expression [C++ 15]
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///
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/// assignment-operator: one of
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/// = *= /= %= += -= <<= >>= &= ^= |=
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///
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/// expression: [C99 6.5.17]
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/// assignment-expression ...[opt]
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/// expression ',' assignment-expression ...[opt]
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/// \endverbatim
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ExprResult Parser::ParseExpression(TypeCastState isTypeCast) {
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ExprResult LHS(ParseAssignmentExpression(isTypeCast));
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return ParseRHSOfBinaryExpression(LHS, prec::Comma);
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}
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/// This routine is called when the '@' is seen and consumed.
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/// Current token is an Identifier and is not a 'try'. This
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/// routine is necessary to disambiguate \@try-statement from,
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/// for example, \@encode-expression.
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///
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ExprResult
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Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
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ExprResult LHS(ParseObjCAtExpression(AtLoc));
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return ParseRHSOfBinaryExpression(LHS, prec::Comma);
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}
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/// This routine is called when a leading '__extension__' is seen and
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/// consumed. This is necessary because the token gets consumed in the
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/// process of disambiguating between an expression and a declaration.
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ExprResult
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Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
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ExprResult LHS(true);
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{
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// Silence extension warnings in the sub-expression
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ExtensionRAIIObject O(Diags);
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LHS = ParseCastExpression(false);
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}
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if (!LHS.isInvalid())
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LHS = Actions.ActOnUnaryOp(getCurScope(), ExtLoc, tok::kw___extension__,
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LHS.take());
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return ParseRHSOfBinaryExpression(LHS, prec::Comma);
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}
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/// \brief Parse an expr that doesn't include (top-level) commas.
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ExprResult Parser::ParseAssignmentExpression(TypeCastState isTypeCast) {
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if (Tok.is(tok::code_completion)) {
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Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
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cutOffParsing();
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return ExprError();
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}
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if (Tok.is(tok::kw_throw))
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return ParseThrowExpression();
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ExprResult LHS = ParseCastExpression(/*isUnaryExpression=*/false,
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/*isAddressOfOperand=*/false,
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isTypeCast);
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return ParseRHSOfBinaryExpression(LHS, prec::Assignment);
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}
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/// \brief Parse an assignment expression where part of an Objective-C message
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/// send has already been parsed.
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///
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/// In this case \p LBracLoc indicates the location of the '[' of the message
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/// send, and either \p ReceiverName or \p ReceiverExpr is non-null indicating
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/// the receiver of the message.
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///
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/// Since this handles full assignment-expression's, it handles postfix
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/// expressions and other binary operators for these expressions as well.
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ExprResult
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Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
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SourceLocation SuperLoc,
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ParsedType ReceiverType,
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Expr *ReceiverExpr) {
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ExprResult R
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= ParseObjCMessageExpressionBody(LBracLoc, SuperLoc,
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ReceiverType, ReceiverExpr);
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R = ParsePostfixExpressionSuffix(R);
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return ParseRHSOfBinaryExpression(R, prec::Assignment);
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}
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ExprResult Parser::ParseConstantExpression(TypeCastState isTypeCast) {
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// C++03 [basic.def.odr]p2:
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// An expression is potentially evaluated unless it appears where an
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// integral constant expression is required (see 5.19) [...].
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// C++98 and C++11 have no such rule, but this is only a defect in C++98.
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EnterExpressionEvaluationContext Unevaluated(Actions,
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Sema::ConstantEvaluated);
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ExprResult LHS(ParseCastExpression(false, false, isTypeCast));
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ExprResult Res(ParseRHSOfBinaryExpression(LHS, prec::Conditional));
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return Actions.ActOnConstantExpression(Res);
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}
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bool Parser::isNotExpressionStart() {
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tok::TokenKind K = Tok.getKind();
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if (K == tok::l_brace || K == tok::r_brace ||
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K == tok::kw_for || K == tok::kw_while ||
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K == tok::kw_if || K == tok::kw_else ||
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K == tok::kw_goto || K == tok::kw_try)
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return true;
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// If this is a decl-specifier, we can't be at the start of an expression.
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return isKnownToBeDeclarationSpecifier();
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}
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/// \brief Parse a binary expression that starts with \p LHS and has a
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/// precedence of at least \p MinPrec.
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ExprResult
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Parser::ParseRHSOfBinaryExpression(ExprResult LHS, prec::Level MinPrec) {
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prec::Level NextTokPrec = getBinOpPrecedence(Tok.getKind(),
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GreaterThanIsOperator,
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getLangOpts().CPlusPlus11);
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SourceLocation ColonLoc;
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while (1) {
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// If this token has a lower precedence than we are allowed to parse (e.g.
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// because we are called recursively, or because the token is not a binop),
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// then we are done!
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if (NextTokPrec < MinPrec)
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return LHS;
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// Consume the operator, saving the operator token for error reporting.
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Token OpToken = Tok;
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ConsumeToken();
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// Bail out when encountering a comma followed by a token which can't
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// possibly be the start of an expression. For instance:
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// int f() { return 1, }
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// We can't do this before consuming the comma, because
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// isNotExpressionStart() looks at the token stream.
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if (OpToken.is(tok::comma) && isNotExpressionStart()) {
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PP.EnterToken(Tok);
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Tok = OpToken;
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return LHS;
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}
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// Special case handling for the ternary operator.
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ExprResult TernaryMiddle(true);
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if (NextTokPrec == prec::Conditional) {
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if (Tok.isNot(tok::colon)) {
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// Don't parse FOO:BAR as if it were a typo for FOO::BAR.
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ColonProtectionRAIIObject X(*this);
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// Handle this production specially:
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// logical-OR-expression '?' expression ':' conditional-expression
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// In particular, the RHS of the '?' is 'expression', not
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// 'logical-OR-expression' as we might expect.
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TernaryMiddle = ParseExpression();
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if (TernaryMiddle.isInvalid()) {
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LHS = ExprError();
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TernaryMiddle = 0;
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}
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} else {
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// Special case handling of "X ? Y : Z" where Y is empty:
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// logical-OR-expression '?' ':' conditional-expression [GNU]
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TernaryMiddle = 0;
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Diag(Tok, diag::ext_gnu_conditional_expr);
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}
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if (Tok.is(tok::colon)) {
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// Eat the colon.
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ColonLoc = ConsumeToken();
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} else {
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// Otherwise, we're missing a ':'. Assume that this was a typo that
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// the user forgot. If we're not in a macro expansion, we can suggest
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// a fixit hint. If there were two spaces before the current token,
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// suggest inserting the colon in between them, otherwise insert ": ".
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SourceLocation FILoc = Tok.getLocation();
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const char *FIText = ": ";
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const SourceManager &SM = PP.getSourceManager();
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if (FILoc.isFileID() || PP.isAtStartOfMacroExpansion(FILoc, &FILoc)) {
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assert(FILoc.isFileID());
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bool IsInvalid = false;
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const char *SourcePtr =
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SM.getCharacterData(FILoc.getLocWithOffset(-1), &IsInvalid);
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if (!IsInvalid && *SourcePtr == ' ') {
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SourcePtr =
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SM.getCharacterData(FILoc.getLocWithOffset(-2), &IsInvalid);
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if (!IsInvalid && *SourcePtr == ' ') {
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FILoc = FILoc.getLocWithOffset(-1);
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FIText = ":";
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}
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}
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}
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Diag(Tok, diag::err_expected_colon)
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<< FixItHint::CreateInsertion(FILoc, FIText);
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Diag(OpToken, diag::note_matching) << "?";
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ColonLoc = Tok.getLocation();
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}
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}
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// Code completion for the right-hand side of an assignment expression
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// goes through a special hook that takes the left-hand side into account.
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if (Tok.is(tok::code_completion) && NextTokPrec == prec::Assignment) {
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Actions.CodeCompleteAssignmentRHS(getCurScope(), LHS.get());
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cutOffParsing();
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return ExprError();
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}
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// Parse another leaf here for the RHS of the operator.
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// ParseCastExpression works here because all RHS expressions in C have it
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// as a prefix, at least. However, in C++, an assignment-expression could
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// be a throw-expression, which is not a valid cast-expression.
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// Therefore we need some special-casing here.
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// Also note that the third operand of the conditional operator is
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// an assignment-expression in C++, and in C++11, we can have a
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// braced-init-list on the RHS of an assignment. For better diagnostics,
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// parse as if we were allowed braced-init-lists everywhere, and check that
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// they only appear on the RHS of assignments later.
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ExprResult RHS;
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bool RHSIsInitList = false;
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if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
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RHS = ParseBraceInitializer();
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RHSIsInitList = true;
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} else if (getLangOpts().CPlusPlus && NextTokPrec <= prec::Conditional)
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RHS = ParseAssignmentExpression();
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else
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RHS = ParseCastExpression(false);
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if (RHS.isInvalid())
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LHS = ExprError();
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// Remember the precedence of this operator and get the precedence of the
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// operator immediately to the right of the RHS.
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prec::Level ThisPrec = NextTokPrec;
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NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
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getLangOpts().CPlusPlus11);
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// Assignment and conditional expressions are right-associative.
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bool isRightAssoc = ThisPrec == prec::Conditional ||
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ThisPrec == prec::Assignment;
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// Get the precedence of the operator to the right of the RHS. If it binds
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// more tightly with RHS than we do, evaluate it completely first.
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if (ThisPrec < NextTokPrec ||
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(ThisPrec == NextTokPrec && isRightAssoc)) {
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if (!RHS.isInvalid() && RHSIsInitList) {
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Diag(Tok, diag::err_init_list_bin_op)
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<< /*LHS*/0 << PP.getSpelling(Tok) << Actions.getExprRange(RHS.get());
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RHS = ExprError();
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}
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// If this is left-associative, only parse things on the RHS that bind
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// more tightly than the current operator. If it is left-associative, it
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// is okay, to bind exactly as tightly. For example, compile A=B=C=D as
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// A=(B=(C=D)), where each paren is a level of recursion here.
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// The function takes ownership of the RHS.
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RHS = ParseRHSOfBinaryExpression(RHS,
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static_cast<prec::Level>(ThisPrec + !isRightAssoc));
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RHSIsInitList = false;
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if (RHS.isInvalid())
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LHS = ExprError();
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NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
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getLangOpts().CPlusPlus11);
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}
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assert(NextTokPrec <= ThisPrec && "Recursion didn't work!");
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if (!RHS.isInvalid() && RHSIsInitList) {
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if (ThisPrec == prec::Assignment) {
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Diag(OpToken, diag::warn_cxx98_compat_generalized_initializer_lists)
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<< Actions.getExprRange(RHS.get());
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} else {
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Diag(OpToken, diag::err_init_list_bin_op)
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<< /*RHS*/1 << PP.getSpelling(OpToken)
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<< Actions.getExprRange(RHS.get());
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LHS = ExprError();
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}
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}
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if (!LHS.isInvalid()) {
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// Combine the LHS and RHS into the LHS (e.g. build AST).
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if (TernaryMiddle.isInvalid()) {
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// If we're using '>>' as an operator within a template
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// argument list (in C++98), suggest the addition of
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// parentheses so that the code remains well-formed in C++0x.
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if (!GreaterThanIsOperator && OpToken.is(tok::greatergreater))
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SuggestParentheses(OpToken.getLocation(),
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diag::warn_cxx11_right_shift_in_template_arg,
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SourceRange(Actions.getExprRange(LHS.get()).getBegin(),
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Actions.getExprRange(RHS.get()).getEnd()));
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LHS = Actions.ActOnBinOp(getCurScope(), OpToken.getLocation(),
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OpToken.getKind(), LHS.take(), RHS.take());
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} else
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LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
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LHS.take(), TernaryMiddle.take(),
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RHS.take());
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}
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}
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}
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/// \brief Parse a cast-expression, or, if \p isUnaryExpression is true,
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/// parse a unary-expression.
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///
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/// \p isAddressOfOperand exists because an id-expression that is the
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/// operand of address-of gets special treatment due to member pointers.
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///
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ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
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bool isAddressOfOperand,
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TypeCastState isTypeCast) {
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bool NotCastExpr;
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ExprResult Res = ParseCastExpression(isUnaryExpression,
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isAddressOfOperand,
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NotCastExpr,
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isTypeCast);
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if (NotCastExpr)
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Diag(Tok, diag::err_expected_expression);
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return Res;
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}
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namespace {
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class CastExpressionIdValidator : public CorrectionCandidateCallback {
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public:
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CastExpressionIdValidator(bool AllowTypes, bool AllowNonTypes)
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: AllowNonTypes(AllowNonTypes) {
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WantTypeSpecifiers = AllowTypes;
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}
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virtual bool ValidateCandidate(const TypoCorrection &candidate) {
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NamedDecl *ND = candidate.getCorrectionDecl();
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if (!ND)
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return candidate.isKeyword();
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if (isa<TypeDecl>(ND))
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return WantTypeSpecifiers;
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return AllowNonTypes;
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}
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private:
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bool AllowNonTypes;
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};
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}
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/// \brief Parse a cast-expression, or, if \pisUnaryExpression is true, parse
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/// a unary-expression.
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///
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/// \p isAddressOfOperand exists because an id-expression that is the operand
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/// of address-of gets special treatment due to member pointers. NotCastExpr
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/// is set to true if the token is not the start of a cast-expression, and no
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/// diagnostic is emitted in this case.
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///
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/// \verbatim
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/// cast-expression: [C99 6.5.4]
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/// unary-expression
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/// '(' type-name ')' cast-expression
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///
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/// unary-expression: [C99 6.5.3]
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/// postfix-expression
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/// '++' unary-expression
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/// '--' unary-expression
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/// unary-operator cast-expression
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/// 'sizeof' unary-expression
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/// 'sizeof' '(' type-name ')'
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/// [C++11] 'sizeof' '...' '(' identifier ')'
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/// [GNU] '__alignof' unary-expression
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/// [GNU] '__alignof' '(' type-name ')'
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/// [C11] '_Alignof' '(' type-name ')'
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/// [C++11] 'alignof' '(' type-id ')'
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/// [GNU] '&&' identifier
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/// [C++11] 'noexcept' '(' expression ')' [C++11 5.3.7]
|
|
/// [C++] new-expression
|
|
/// [C++] delete-expression
|
|
///
|
|
/// unary-operator: one of
|
|
/// '&' '*' '+' '-' '~' '!'
|
|
/// [GNU] '__extension__' '__real' '__imag'
|
|
///
|
|
/// primary-expression: [C99 6.5.1]
|
|
/// [C99] identifier
|
|
/// [C++] id-expression
|
|
/// constant
|
|
/// string-literal
|
|
/// [C++] boolean-literal [C++ 2.13.5]
|
|
/// [C++11] 'nullptr' [C++11 2.14.7]
|
|
/// [C++11] user-defined-literal
|
|
/// '(' expression ')'
|
|
/// [C11] generic-selection
|
|
/// '__func__' [C99 6.4.2.2]
|
|
/// [GNU] '__FUNCTION__'
|
|
/// [MS] '__FUNCDNAME__'
|
|
/// [MS] 'L__FUNCTION__'
|
|
/// [GNU] '__PRETTY_FUNCTION__'
|
|
/// [GNU] '(' compound-statement ')'
|
|
/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
|
|
/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
|
|
/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
|
|
/// assign-expr ')'
|
|
/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
|
|
/// [GNU] '__null'
|
|
/// [OBJC] '[' objc-message-expr ']'
|
|
/// [OBJC] '\@selector' '(' objc-selector-arg ')'
|
|
/// [OBJC] '\@protocol' '(' identifier ')'
|
|
/// [OBJC] '\@encode' '(' type-name ')'
|
|
/// [OBJC] objc-string-literal
|
|
/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
|
|
/// [C++11] simple-type-specifier braced-init-list [C++11 5.2.3]
|
|
/// [C++] typename-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
|
|
/// [C++11] typename-specifier braced-init-list [C++11 5.2.3]
|
|
/// [C++] 'const_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
|
|
/// [C++] 'dynamic_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
|
|
/// [C++] 'reinterpret_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
|
|
/// [C++] 'static_cast' '<' type-name '>' '(' expression ')' [C++ 5.2p1]
|
|
/// [C++] 'typeid' '(' expression ')' [C++ 5.2p1]
|
|
/// [C++] 'typeid' '(' type-id ')' [C++ 5.2p1]
|
|
/// [C++] 'this' [C++ 9.3.2]
|
|
/// [G++] unary-type-trait '(' type-id ')'
|
|
/// [G++] binary-type-trait '(' type-id ',' type-id ')' [TODO]
|
|
/// [EMBT] array-type-trait '(' type-id ',' integer ')'
|
|
/// [clang] '^' block-literal
|
|
///
|
|
/// constant: [C99 6.4.4]
|
|
/// integer-constant
|
|
/// floating-constant
|
|
/// enumeration-constant -> identifier
|
|
/// character-constant
|
|
///
|
|
/// id-expression: [C++ 5.1]
|
|
/// unqualified-id
|
|
/// qualified-id
|
|
///
|
|
/// unqualified-id: [C++ 5.1]
|
|
/// identifier
|
|
/// operator-function-id
|
|
/// conversion-function-id
|
|
/// '~' class-name
|
|
/// template-id
|
|
///
|
|
/// new-expression: [C++ 5.3.4]
|
|
/// '::'[opt] 'new' new-placement[opt] new-type-id
|
|
/// new-initializer[opt]
|
|
/// '::'[opt] 'new' new-placement[opt] '(' type-id ')'
|
|
/// new-initializer[opt]
|
|
///
|
|
/// delete-expression: [C++ 5.3.5]
|
|
/// '::'[opt] 'delete' cast-expression
|
|
/// '::'[opt] 'delete' '[' ']' cast-expression
|
|
///
|
|
/// [GNU/Embarcadero] unary-type-trait:
|
|
/// '__is_arithmetic'
|
|
/// '__is_floating_point'
|
|
/// '__is_integral'
|
|
/// '__is_lvalue_expr'
|
|
/// '__is_rvalue_expr'
|
|
/// '__is_complete_type'
|
|
/// '__is_void'
|
|
/// '__is_array'
|
|
/// '__is_function'
|
|
/// '__is_reference'
|
|
/// '__is_lvalue_reference'
|
|
/// '__is_rvalue_reference'
|
|
/// '__is_fundamental'
|
|
/// '__is_object'
|
|
/// '__is_scalar'
|
|
/// '__is_compound'
|
|
/// '__is_pointer'
|
|
/// '__is_member_object_pointer'
|
|
/// '__is_member_function_pointer'
|
|
/// '__is_member_pointer'
|
|
/// '__is_const'
|
|
/// '__is_volatile'
|
|
/// '__is_trivial'
|
|
/// '__is_standard_layout'
|
|
/// '__is_signed'
|
|
/// '__is_unsigned'
|
|
///
|
|
/// [GNU] unary-type-trait:
|
|
/// '__has_nothrow_assign'
|
|
/// '__has_nothrow_copy'
|
|
/// '__has_nothrow_constructor'
|
|
/// '__has_trivial_assign' [TODO]
|
|
/// '__has_trivial_copy' [TODO]
|
|
/// '__has_trivial_constructor'
|
|
/// '__has_trivial_destructor'
|
|
/// '__has_virtual_destructor'
|
|
/// '__is_abstract' [TODO]
|
|
/// '__is_class'
|
|
/// '__is_empty' [TODO]
|
|
/// '__is_enum'
|
|
/// '__is_final'
|
|
/// '__is_pod'
|
|
/// '__is_polymorphic'
|
|
/// '__is_sealed' [MS]
|
|
/// '__is_trivial'
|
|
/// '__is_union'
|
|
///
|
|
/// [Clang] unary-type-trait:
|
|
/// '__trivially_copyable'
|
|
///
|
|
/// binary-type-trait:
|
|
/// [GNU] '__is_base_of'
|
|
/// [MS] '__is_convertible_to'
|
|
/// '__is_convertible'
|
|
/// '__is_same'
|
|
///
|
|
/// [Embarcadero] array-type-trait:
|
|
/// '__array_rank'
|
|
/// '__array_extent'
|
|
///
|
|
/// [Embarcadero] expression-trait:
|
|
/// '__is_lvalue_expr'
|
|
/// '__is_rvalue_expr'
|
|
/// \endverbatim
|
|
///
|
|
ExprResult Parser::ParseCastExpression(bool isUnaryExpression,
|
|
bool isAddressOfOperand,
|
|
bool &NotCastExpr,
|
|
TypeCastState isTypeCast) {
|
|
ExprResult Res;
|
|
tok::TokenKind SavedKind = Tok.getKind();
|
|
NotCastExpr = false;
|
|
|
|
// This handles all of cast-expression, unary-expression, postfix-expression,
|
|
// and primary-expression. We handle them together like this for efficiency
|
|
// and to simplify handling of an expression starting with a '(' token: which
|
|
// may be one of a parenthesized expression, cast-expression, compound literal
|
|
// expression, or statement expression.
|
|
//
|
|
// If the parsed tokens consist of a primary-expression, the cases below
|
|
// break out of the switch; at the end we call ParsePostfixExpressionSuffix
|
|
// to handle the postfix expression suffixes. Cases that cannot be followed
|
|
// by postfix exprs should return without invoking
|
|
// ParsePostfixExpressionSuffix.
|
|
switch (SavedKind) {
|
|
case tok::l_paren: {
|
|
// If this expression is limited to being a unary-expression, the parent can
|
|
// not start a cast expression.
|
|
ParenParseOption ParenExprType =
|
|
(isUnaryExpression && !getLangOpts().CPlusPlus)? CompoundLiteral : CastExpr;
|
|
ParsedType CastTy;
|
|
SourceLocation RParenLoc;
|
|
|
|
{
|
|
// The inside of the parens don't need to be a colon protected scope, and
|
|
// isn't immediately a message send.
|
|
ColonProtectionRAIIObject X(*this, false);
|
|
|
|
Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
|
|
isTypeCast == IsTypeCast, CastTy, RParenLoc);
|
|
}
|
|
|
|
switch (ParenExprType) {
|
|
case SimpleExpr: break; // Nothing else to do.
|
|
case CompoundStmt: break; // Nothing else to do.
|
|
case CompoundLiteral:
|
|
// We parsed '(' type-name ')' '{' ... '}'. If any suffixes of
|
|
// postfix-expression exist, parse them now.
|
|
break;
|
|
case CastExpr:
|
|
// We have parsed the cast-expression and no postfix-expr pieces are
|
|
// following.
|
|
return Res;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
// primary-expression
|
|
case tok::numeric_constant:
|
|
// constant: integer-constant
|
|
// constant: floating-constant
|
|
|
|
Res = Actions.ActOnNumericConstant(Tok, /*UDLScope*/getCurScope());
|
|
ConsumeToken();
|
|
break;
|
|
|
|
case tok::kw_true:
|
|
case tok::kw_false:
|
|
return ParseCXXBoolLiteral();
|
|
|
|
case tok::kw___objc_yes:
|
|
case tok::kw___objc_no:
|
|
return ParseObjCBoolLiteral();
|
|
|
|
case tok::kw_nullptr:
|
|
Diag(Tok, diag::warn_cxx98_compat_nullptr);
|
|
return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
|
|
|
|
case tok::annot_primary_expr:
|
|
assert(Res.get() == 0 && "Stray primary-expression annotation?");
|
|
Res = getExprAnnotation(Tok);
|
|
ConsumeToken();
|
|
break;
|
|
|
|
case tok::kw_decltype:
|
|
// Annotate the token and tail recurse.
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
assert(Tok.isNot(tok::kw_decltype));
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
|
|
|
|
case tok::identifier: { // primary-expression: identifier
|
|
// unqualified-id: identifier
|
|
// constant: enumeration-constant
|
|
// Turn a potentially qualified name into a annot_typename or
|
|
// annot_cxxscope if it would be valid. This handles things like x::y, etc.
|
|
if (getLangOpts().CPlusPlus) {
|
|
// Avoid the unnecessary parse-time lookup in the common case
|
|
// where the syntax forbids a type.
|
|
const Token &Next = NextToken();
|
|
|
|
// If this identifier was reverted from a token ID, and the next token
|
|
// is a parenthesis, this is likely to be a use of a type trait. Check
|
|
// those tokens.
|
|
if (Next.is(tok::l_paren) &&
|
|
Tok.is(tok::identifier) &&
|
|
Tok.getIdentifierInfo()->hasRevertedTokenIDToIdentifier()) {
|
|
IdentifierInfo *II = Tok.getIdentifierInfo();
|
|
// Build up the mapping of revertable type traits, for future use.
|
|
if (RevertableTypeTraits.empty()) {
|
|
#define RTT_JOIN(X,Y) X##Y
|
|
#define REVERTABLE_TYPE_TRAIT(Name) \
|
|
RevertableTypeTraits[PP.getIdentifierInfo(#Name)] \
|
|
= RTT_JOIN(tok::kw_,Name)
|
|
|
|
REVERTABLE_TYPE_TRAIT(__is_arithmetic);
|
|
REVERTABLE_TYPE_TRAIT(__is_convertible);
|
|
REVERTABLE_TYPE_TRAIT(__is_empty);
|
|
REVERTABLE_TYPE_TRAIT(__is_floating_point);
|
|
REVERTABLE_TYPE_TRAIT(__is_function);
|
|
REVERTABLE_TYPE_TRAIT(__is_fundamental);
|
|
REVERTABLE_TYPE_TRAIT(__is_integral);
|
|
REVERTABLE_TYPE_TRAIT(__is_member_function_pointer);
|
|
REVERTABLE_TYPE_TRAIT(__is_member_pointer);
|
|
REVERTABLE_TYPE_TRAIT(__is_pod);
|
|
REVERTABLE_TYPE_TRAIT(__is_pointer);
|
|
REVERTABLE_TYPE_TRAIT(__is_same);
|
|
REVERTABLE_TYPE_TRAIT(__is_scalar);
|
|
REVERTABLE_TYPE_TRAIT(__is_signed);
|
|
REVERTABLE_TYPE_TRAIT(__is_unsigned);
|
|
REVERTABLE_TYPE_TRAIT(__is_void);
|
|
#undef REVERTABLE_TYPE_TRAIT
|
|
#undef RTT_JOIN
|
|
}
|
|
|
|
// If we find that this is in fact the name of a type trait,
|
|
// update the token kind in place and parse again to treat it as
|
|
// the appropriate kind of type trait.
|
|
llvm::SmallDenseMap<IdentifierInfo *, tok::TokenKind>::iterator Known
|
|
= RevertableTypeTraits.find(II);
|
|
if (Known != RevertableTypeTraits.end()) {
|
|
Tok.setKind(Known->second);
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
|
|
NotCastExpr, isTypeCast);
|
|
}
|
|
}
|
|
|
|
if (Next.is(tok::coloncolon) ||
|
|
(!ColonIsSacred && Next.is(tok::colon)) ||
|
|
Next.is(tok::less) ||
|
|
Next.is(tok::l_paren) ||
|
|
Next.is(tok::l_brace)) {
|
|
// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
if (!Tok.is(tok::identifier))
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
|
|
}
|
|
}
|
|
|
|
// Consume the identifier so that we can see if it is followed by a '(' or
|
|
// '.'.
|
|
IdentifierInfo &II = *Tok.getIdentifierInfo();
|
|
SourceLocation ILoc = ConsumeToken();
|
|
|
|
// Support 'Class.property' and 'super.property' notation.
|
|
if (getLangOpts().ObjC1 && Tok.is(tok::period) &&
|
|
(Actions.getTypeName(II, ILoc, getCurScope()) ||
|
|
// Allow the base to be 'super' if in an objc-method.
|
|
(&II == Ident_super && getCurScope()->isInObjcMethodScope()))) {
|
|
ConsumeToken();
|
|
|
|
// Allow either an identifier or the keyword 'class' (in C++).
|
|
if (Tok.isNot(tok::identifier) &&
|
|
!(getLangOpts().CPlusPlus && Tok.is(tok::kw_class))) {
|
|
Diag(Tok, diag::err_expected_property_name);
|
|
return ExprError();
|
|
}
|
|
IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
|
|
SourceLocation PropertyLoc = ConsumeToken();
|
|
|
|
Res = Actions.ActOnClassPropertyRefExpr(II, PropertyName,
|
|
ILoc, PropertyLoc);
|
|
break;
|
|
}
|
|
|
|
// In an Objective-C method, if we have "super" followed by an identifier,
|
|
// the token sequence is ill-formed. However, if there's a ':' or ']' after
|
|
// that identifier, this is probably a message send with a missing open
|
|
// bracket. Treat it as such.
|
|
if (getLangOpts().ObjC1 && &II == Ident_super && !InMessageExpression &&
|
|
getCurScope()->isInObjcMethodScope() &&
|
|
((Tok.is(tok::identifier) &&
|
|
(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) ||
|
|
Tok.is(tok::code_completion))) {
|
|
Res = ParseObjCMessageExpressionBody(SourceLocation(), ILoc, ParsedType(),
|
|
0);
|
|
break;
|
|
}
|
|
|
|
// If we have an Objective-C class name followed by an identifier
|
|
// and either ':' or ']', this is an Objective-C class message
|
|
// send that's missing the opening '['. Recovery
|
|
// appropriately. Also take this path if we're performing code
|
|
// completion after an Objective-C class name.
|
|
if (getLangOpts().ObjC1 &&
|
|
((Tok.is(tok::identifier) && !InMessageExpression) ||
|
|
Tok.is(tok::code_completion))) {
|
|
const Token& Next = NextToken();
|
|
if (Tok.is(tok::code_completion) ||
|
|
Next.is(tok::colon) || Next.is(tok::r_square))
|
|
if (ParsedType Typ = Actions.getTypeName(II, ILoc, getCurScope()))
|
|
if (Typ.get()->isObjCObjectOrInterfaceType()) {
|
|
// Fake up a Declarator to use with ActOnTypeName.
|
|
DeclSpec DS(AttrFactory);
|
|
DS.SetRangeStart(ILoc);
|
|
DS.SetRangeEnd(ILoc);
|
|
const char *PrevSpec = 0;
|
|
unsigned DiagID;
|
|
DS.SetTypeSpecType(TST_typename, ILoc, PrevSpec, DiagID, Typ);
|
|
|
|
Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
|
|
TypeResult Ty = Actions.ActOnTypeName(getCurScope(),
|
|
DeclaratorInfo);
|
|
if (Ty.isInvalid())
|
|
break;
|
|
|
|
Res = ParseObjCMessageExpressionBody(SourceLocation(),
|
|
SourceLocation(),
|
|
Ty.get(), 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Make sure to pass down the right value for isAddressOfOperand.
|
|
if (isAddressOfOperand && isPostfixExpressionSuffixStart())
|
|
isAddressOfOperand = false;
|
|
|
|
// Function designators are allowed to be undeclared (C99 6.5.1p2), so we
|
|
// need to know whether or not this identifier is a function designator or
|
|
// not.
|
|
UnqualifiedId Name;
|
|
CXXScopeSpec ScopeSpec;
|
|
SourceLocation TemplateKWLoc;
|
|
CastExpressionIdValidator Validator(isTypeCast != NotTypeCast,
|
|
isTypeCast != IsTypeCast);
|
|
Name.setIdentifier(&II, ILoc);
|
|
Res = Actions.ActOnIdExpression(getCurScope(), ScopeSpec, TemplateKWLoc,
|
|
Name, Tok.is(tok::l_paren),
|
|
isAddressOfOperand, &Validator);
|
|
break;
|
|
}
|
|
case tok::char_constant: // constant: character-constant
|
|
case tok::wide_char_constant:
|
|
case tok::utf16_char_constant:
|
|
case tok::utf32_char_constant:
|
|
Res = Actions.ActOnCharacterConstant(Tok, /*UDLScope*/getCurScope());
|
|
ConsumeToken();
|
|
break;
|
|
case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
|
|
case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
|
|
case tok::kw___FUNCDNAME__: // primary-expression: __FUNCDNAME__ [MS]
|
|
case tok::kw_L__FUNCTION__: // primary-expression: L__FUNCTION__ [MS]
|
|
case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
|
|
Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
|
|
ConsumeToken();
|
|
break;
|
|
case tok::string_literal: // primary-expression: string-literal
|
|
case tok::wide_string_literal:
|
|
case tok::utf8_string_literal:
|
|
case tok::utf16_string_literal:
|
|
case tok::utf32_string_literal:
|
|
Res = ParseStringLiteralExpression(true);
|
|
break;
|
|
case tok::kw__Generic: // primary-expression: generic-selection [C11 6.5.1]
|
|
Res = ParseGenericSelectionExpression();
|
|
break;
|
|
case tok::kw___builtin_va_arg:
|
|
case tok::kw___builtin_offsetof:
|
|
case tok::kw___builtin_choose_expr:
|
|
case tok::kw___builtin_astype: // primary-expression: [OCL] as_type()
|
|
case tok::kw___builtin_convertvector:
|
|
return ParseBuiltinPrimaryExpression();
|
|
case tok::kw___null:
|
|
return Actions.ActOnGNUNullExpr(ConsumeToken());
|
|
|
|
case tok::plusplus: // unary-expression: '++' unary-expression [C99]
|
|
case tok::minusminus: { // unary-expression: '--' unary-expression [C99]
|
|
// C++ [expr.unary] has:
|
|
// unary-expression:
|
|
// ++ cast-expression
|
|
// -- cast-expression
|
|
SourceLocation SavedLoc = ConsumeToken();
|
|
Res = ParseCastExpression(!getLangOpts().CPlusPlus);
|
|
if (!Res.isInvalid())
|
|
Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
|
|
return Res;
|
|
}
|
|
case tok::amp: { // unary-expression: '&' cast-expression
|
|
// Special treatment because of member pointers
|
|
SourceLocation SavedLoc = ConsumeToken();
|
|
Res = ParseCastExpression(false, true);
|
|
if (!Res.isInvalid())
|
|
Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
|
|
return Res;
|
|
}
|
|
|
|
case tok::star: // unary-expression: '*' cast-expression
|
|
case tok::plus: // unary-expression: '+' cast-expression
|
|
case tok::minus: // unary-expression: '-' cast-expression
|
|
case tok::tilde: // unary-expression: '~' cast-expression
|
|
case tok::exclaim: // unary-expression: '!' cast-expression
|
|
case tok::kw___real: // unary-expression: '__real' cast-expression [GNU]
|
|
case tok::kw___imag: { // unary-expression: '__imag' cast-expression [GNU]
|
|
SourceLocation SavedLoc = ConsumeToken();
|
|
Res = ParseCastExpression(false);
|
|
if (!Res.isInvalid())
|
|
Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
|
|
return Res;
|
|
}
|
|
|
|
case tok::kw___extension__:{//unary-expression:'__extension__' cast-expr [GNU]
|
|
// __extension__ silences extension warnings in the subexpression.
|
|
ExtensionRAIIObject O(Diags); // Use RAII to do this.
|
|
SourceLocation SavedLoc = ConsumeToken();
|
|
Res = ParseCastExpression(false);
|
|
if (!Res.isInvalid())
|
|
Res = Actions.ActOnUnaryOp(getCurScope(), SavedLoc, SavedKind, Res.get());
|
|
return Res;
|
|
}
|
|
case tok::kw__Alignof: // unary-expression: '_Alignof' '(' type-name ')'
|
|
if (!getLangOpts().C11)
|
|
Diag(Tok, diag::ext_c11_alignment) << Tok.getName();
|
|
// fallthrough
|
|
case tok::kw_alignof: // unary-expression: 'alignof' '(' type-id ')'
|
|
case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
|
|
// unary-expression: '__alignof' '(' type-name ')'
|
|
case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
|
|
// unary-expression: 'sizeof' '(' type-name ')'
|
|
case tok::kw_vec_step: // unary-expression: OpenCL 'vec_step' expression
|
|
return ParseUnaryExprOrTypeTraitExpression();
|
|
case tok::ampamp: { // unary-expression: '&&' identifier
|
|
SourceLocation AmpAmpLoc = ConsumeToken();
|
|
if (Tok.isNot(tok::identifier))
|
|
return ExprError(Diag(Tok, diag::err_expected_ident));
|
|
|
|
if (getCurScope()->getFnParent() == 0)
|
|
return ExprError(Diag(Tok, diag::err_address_of_label_outside_fn));
|
|
|
|
Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
|
|
LabelDecl *LD = Actions.LookupOrCreateLabel(Tok.getIdentifierInfo(),
|
|
Tok.getLocation());
|
|
Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(), LD);
|
|
ConsumeToken();
|
|
return Res;
|
|
}
|
|
case tok::kw_const_cast:
|
|
case tok::kw_dynamic_cast:
|
|
case tok::kw_reinterpret_cast:
|
|
case tok::kw_static_cast:
|
|
Res = ParseCXXCasts();
|
|
break;
|
|
case tok::kw_typeid:
|
|
Res = ParseCXXTypeid();
|
|
break;
|
|
case tok::kw___uuidof:
|
|
Res = ParseCXXUuidof();
|
|
break;
|
|
case tok::kw_this:
|
|
Res = ParseCXXThis();
|
|
break;
|
|
|
|
case tok::annot_typename:
|
|
if (isStartOfObjCClassMessageMissingOpenBracket()) {
|
|
ParsedType Type = getTypeAnnotation(Tok);
|
|
|
|
// Fake up a Declarator to use with ActOnTypeName.
|
|
DeclSpec DS(AttrFactory);
|
|
DS.SetRangeStart(Tok.getLocation());
|
|
DS.SetRangeEnd(Tok.getLastLoc());
|
|
|
|
const char *PrevSpec = 0;
|
|
unsigned DiagID;
|
|
DS.SetTypeSpecType(TST_typename, Tok.getAnnotationEndLoc(),
|
|
PrevSpec, DiagID, Type);
|
|
|
|
Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
|
|
TypeResult Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
|
|
if (Ty.isInvalid())
|
|
break;
|
|
|
|
ConsumeToken();
|
|
Res = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
|
|
Ty.get(), 0);
|
|
break;
|
|
}
|
|
// Fall through
|
|
|
|
case tok::annot_decltype:
|
|
case tok::kw_char:
|
|
case tok::kw_wchar_t:
|
|
case tok::kw_char16_t:
|
|
case tok::kw_char32_t:
|
|
case tok::kw_bool:
|
|
case tok::kw_short:
|
|
case tok::kw_int:
|
|
case tok::kw_long:
|
|
case tok::kw___int64:
|
|
case tok::kw___int128:
|
|
case tok::kw_signed:
|
|
case tok::kw_unsigned:
|
|
case tok::kw_half:
|
|
case tok::kw_float:
|
|
case tok::kw_double:
|
|
case tok::kw_void:
|
|
case tok::kw_typename:
|
|
case tok::kw_typeof:
|
|
case tok::kw___vector:
|
|
case tok::kw_image1d_t:
|
|
case tok::kw_image1d_array_t:
|
|
case tok::kw_image1d_buffer_t:
|
|
case tok::kw_image2d_t:
|
|
case tok::kw_image2d_array_t:
|
|
case tok::kw_image3d_t:
|
|
case tok::kw_sampler_t:
|
|
case tok::kw_event_t: {
|
|
if (!getLangOpts().CPlusPlus) {
|
|
Diag(Tok, diag::err_expected_expression);
|
|
return ExprError();
|
|
}
|
|
|
|
if (SavedKind == tok::kw_typename) {
|
|
// postfix-expression: typename-specifier '(' expression-list[opt] ')'
|
|
// typename-specifier braced-init-list
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
|
|
if (!Actions.isSimpleTypeSpecifier(Tok.getKind()))
|
|
// We are trying to parse a simple-type-specifier but might not get such
|
|
// a token after error recovery.
|
|
return ExprError();
|
|
}
|
|
|
|
// postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
|
|
// simple-type-specifier braced-init-list
|
|
//
|
|
DeclSpec DS(AttrFactory);
|
|
|
|
ParseCXXSimpleTypeSpecifier(DS);
|
|
if (Tok.isNot(tok::l_paren) &&
|
|
(!getLangOpts().CPlusPlus11 || Tok.isNot(tok::l_brace)))
|
|
return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
|
|
<< DS.getSourceRange());
|
|
|
|
if (Tok.is(tok::l_brace))
|
|
Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
|
|
|
|
Res = ParseCXXTypeConstructExpression(DS);
|
|
break;
|
|
}
|
|
|
|
case tok::annot_cxxscope: { // [C++] id-expression: qualified-id
|
|
// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
|
|
// (We can end up in this situation after tentative parsing.)
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
if (!Tok.is(tok::annot_cxxscope))
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
|
|
NotCastExpr, isTypeCast);
|
|
|
|
Token Next = NextToken();
|
|
if (Next.is(tok::annot_template_id)) {
|
|
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Next);
|
|
if (TemplateId->Kind == TNK_Type_template) {
|
|
// We have a qualified template-id that we know refers to a
|
|
// type, translate it into a type and continue parsing as a
|
|
// cast expression.
|
|
CXXScopeSpec SS;
|
|
ParseOptionalCXXScopeSpecifier(SS, ParsedType(),
|
|
/*EnteringContext=*/false);
|
|
AnnotateTemplateIdTokenAsType();
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
|
|
NotCastExpr, isTypeCast);
|
|
}
|
|
}
|
|
|
|
// Parse as an id-expression.
|
|
Res = ParseCXXIdExpression(isAddressOfOperand);
|
|
break;
|
|
}
|
|
|
|
case tok::annot_template_id: { // [C++] template-id
|
|
TemplateIdAnnotation *TemplateId = takeTemplateIdAnnotation(Tok);
|
|
if (TemplateId->Kind == TNK_Type_template) {
|
|
// We have a template-id that we know refers to a type,
|
|
// translate it into a type and continue parsing as a cast
|
|
// expression.
|
|
AnnotateTemplateIdTokenAsType();
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand,
|
|
NotCastExpr, isTypeCast);
|
|
}
|
|
|
|
// Fall through to treat the template-id as an id-expression.
|
|
}
|
|
|
|
case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
|
|
Res = ParseCXXIdExpression(isAddressOfOperand);
|
|
break;
|
|
|
|
case tok::coloncolon: {
|
|
// ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
|
|
// annotates the token, tail recurse.
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
if (!Tok.is(tok::coloncolon))
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
|
|
|
|
// ::new -> [C++] new-expression
|
|
// ::delete -> [C++] delete-expression
|
|
SourceLocation CCLoc = ConsumeToken();
|
|
if (Tok.is(tok::kw_new))
|
|
return ParseCXXNewExpression(true, CCLoc);
|
|
if (Tok.is(tok::kw_delete))
|
|
return ParseCXXDeleteExpression(true, CCLoc);
|
|
|
|
// This is not a type name or scope specifier, it is an invalid expression.
|
|
Diag(CCLoc, diag::err_expected_expression);
|
|
return ExprError();
|
|
}
|
|
|
|
case tok::kw_new: // [C++] new-expression
|
|
return ParseCXXNewExpression(false, Tok.getLocation());
|
|
|
|
case tok::kw_delete: // [C++] delete-expression
|
|
return ParseCXXDeleteExpression(false, Tok.getLocation());
|
|
|
|
case tok::kw_noexcept: { // [C++0x] 'noexcept' '(' expression ')'
|
|
Diag(Tok, diag::warn_cxx98_compat_noexcept_expr);
|
|
SourceLocation KeyLoc = ConsumeToken();
|
|
BalancedDelimiterTracker T(*this, tok::l_paren);
|
|
|
|
if (T.expectAndConsume(diag::err_expected_lparen_after, "noexcept"))
|
|
return ExprError();
|
|
// C++11 [expr.unary.noexcept]p1:
|
|
// The noexcept operator determines whether the evaluation of its operand,
|
|
// which is an unevaluated operand, can throw an exception.
|
|
EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
|
|
ExprResult Result = ParseExpression();
|
|
|
|
T.consumeClose();
|
|
|
|
if (!Result.isInvalid())
|
|
Result = Actions.ActOnNoexceptExpr(KeyLoc, T.getOpenLocation(),
|
|
Result.take(), T.getCloseLocation());
|
|
return Result;
|
|
}
|
|
|
|
case tok::kw___is_abstract: // [GNU] unary-type-trait
|
|
case tok::kw___is_class:
|
|
case tok::kw___is_empty:
|
|
case tok::kw___is_enum:
|
|
case tok::kw___is_interface_class:
|
|
case tok::kw___is_literal:
|
|
case tok::kw___is_arithmetic:
|
|
case tok::kw___is_integral:
|
|
case tok::kw___is_floating_point:
|
|
case tok::kw___is_complete_type:
|
|
case tok::kw___is_void:
|
|
case tok::kw___is_array:
|
|
case tok::kw___is_function:
|
|
case tok::kw___is_reference:
|
|
case tok::kw___is_lvalue_reference:
|
|
case tok::kw___is_rvalue_reference:
|
|
case tok::kw___is_fundamental:
|
|
case tok::kw___is_object:
|
|
case tok::kw___is_scalar:
|
|
case tok::kw___is_compound:
|
|
case tok::kw___is_pointer:
|
|
case tok::kw___is_member_object_pointer:
|
|
case tok::kw___is_member_function_pointer:
|
|
case tok::kw___is_member_pointer:
|
|
case tok::kw___is_const:
|
|
case tok::kw___is_volatile:
|
|
case tok::kw___is_standard_layout:
|
|
case tok::kw___is_signed:
|
|
case tok::kw___is_unsigned:
|
|
case tok::kw___is_literal_type:
|
|
case tok::kw___is_pod:
|
|
case tok::kw___is_polymorphic:
|
|
case tok::kw___is_trivial:
|
|
case tok::kw___is_trivially_copyable:
|
|
case tok::kw___is_union:
|
|
case tok::kw___is_final:
|
|
case tok::kw___is_sealed:
|
|
case tok::kw___has_trivial_constructor:
|
|
case tok::kw___has_trivial_move_constructor:
|
|
case tok::kw___has_trivial_copy:
|
|
case tok::kw___has_trivial_assign:
|
|
case tok::kw___has_trivial_move_assign:
|
|
case tok::kw___has_trivial_destructor:
|
|
case tok::kw___has_nothrow_assign:
|
|
case tok::kw___has_nothrow_move_assign:
|
|
case tok::kw___has_nothrow_copy:
|
|
case tok::kw___has_nothrow_constructor:
|
|
case tok::kw___has_virtual_destructor:
|
|
return ParseUnaryTypeTrait();
|
|
|
|
case tok::kw___builtin_types_compatible_p:
|
|
case tok::kw___is_base_of:
|
|
case tok::kw___is_same:
|
|
case tok::kw___is_convertible:
|
|
case tok::kw___is_convertible_to:
|
|
case tok::kw___is_trivially_assignable:
|
|
return ParseBinaryTypeTrait();
|
|
|
|
case tok::kw___is_trivially_constructible:
|
|
return ParseTypeTrait();
|
|
|
|
case tok::kw___array_rank:
|
|
case tok::kw___array_extent:
|
|
return ParseArrayTypeTrait();
|
|
|
|
case tok::kw___is_lvalue_expr:
|
|
case tok::kw___is_rvalue_expr:
|
|
return ParseExpressionTrait();
|
|
|
|
case tok::at: {
|
|
SourceLocation AtLoc = ConsumeToken();
|
|
return ParseObjCAtExpression(AtLoc);
|
|
}
|
|
case tok::caret:
|
|
Res = ParseBlockLiteralExpression();
|
|
break;
|
|
case tok::code_completion: {
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
|
|
cutOffParsing();
|
|
return ExprError();
|
|
}
|
|
case tok::l_square:
|
|
if (getLangOpts().CPlusPlus11) {
|
|
if (getLangOpts().ObjC1) {
|
|
// C++11 lambda expressions and Objective-C message sends both start with a
|
|
// square bracket. There are three possibilities here:
|
|
// we have a valid lambda expression, we have an invalid lambda
|
|
// expression, or we have something that doesn't appear to be a lambda.
|
|
// If we're in the last case, we fall back to ParseObjCMessageExpression.
|
|
Res = TryParseLambdaExpression();
|
|
if (!Res.isInvalid() && !Res.get())
|
|
Res = ParseObjCMessageExpression();
|
|
break;
|
|
}
|
|
Res = ParseLambdaExpression();
|
|
break;
|
|
}
|
|
if (getLangOpts().ObjC1) {
|
|
Res = ParseObjCMessageExpression();
|
|
break;
|
|
}
|
|
// FALL THROUGH.
|
|
default:
|
|
NotCastExpr = true;
|
|
return ExprError();
|
|
}
|
|
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(Res);
|
|
}
|
|
|
|
/// \brief Once the leading part of a postfix-expression is parsed, this
|
|
/// method parses any suffixes that apply.
|
|
///
|
|
/// \verbatim
|
|
/// postfix-expression: [C99 6.5.2]
|
|
/// primary-expression
|
|
/// postfix-expression '[' expression ']'
|
|
/// postfix-expression '[' braced-init-list ']'
|
|
/// postfix-expression '(' argument-expression-list[opt] ')'
|
|
/// postfix-expression '.' identifier
|
|
/// postfix-expression '->' identifier
|
|
/// postfix-expression '++'
|
|
/// postfix-expression '--'
|
|
/// '(' type-name ')' '{' initializer-list '}'
|
|
/// '(' type-name ')' '{' initializer-list ',' '}'
|
|
///
|
|
/// argument-expression-list: [C99 6.5.2]
|
|
/// argument-expression ...[opt]
|
|
/// argument-expression-list ',' assignment-expression ...[opt]
|
|
/// \endverbatim
|
|
ExprResult
|
|
Parser::ParsePostfixExpressionSuffix(ExprResult LHS) {
|
|
// Now that the primary-expression piece of the postfix-expression has been
|
|
// parsed, see if there are any postfix-expression pieces here.
|
|
SourceLocation Loc;
|
|
while (1) {
|
|
switch (Tok.getKind()) {
|
|
case tok::code_completion:
|
|
if (InMessageExpression)
|
|
return LHS;
|
|
|
|
Actions.CodeCompletePostfixExpression(getCurScope(), LHS);
|
|
cutOffParsing();
|
|
return ExprError();
|
|
|
|
case tok::identifier:
|
|
// If we see identifier: after an expression, and we're not already in a
|
|
// message send, then this is probably a message send with a missing
|
|
// opening bracket '['.
|
|
if (getLangOpts().ObjC1 && !InMessageExpression &&
|
|
(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
|
|
LHS = ParseObjCMessageExpressionBody(SourceLocation(), SourceLocation(),
|
|
ParsedType(), LHS.get());
|
|
break;
|
|
}
|
|
|
|
// Fall through; this isn't a message send.
|
|
|
|
default: // Not a postfix-expression suffix.
|
|
return LHS;
|
|
case tok::l_square: { // postfix-expression: p-e '[' expression ']'
|
|
// If we have a array postfix expression that starts on a new line and
|
|
// Objective-C is enabled, it is highly likely that the user forgot a
|
|
// semicolon after the base expression and that the array postfix-expr is
|
|
// actually another message send. In this case, do some look-ahead to see
|
|
// if the contents of the square brackets are obviously not a valid
|
|
// expression and recover by pretending there is no suffix.
|
|
if (getLangOpts().ObjC1 && Tok.isAtStartOfLine() &&
|
|
isSimpleObjCMessageExpression())
|
|
return LHS;
|
|
|
|
// Reject array indices starting with a lambda-expression. '[[' is
|
|
// reserved for attributes.
|
|
if (CheckProhibitedCXX11Attribute())
|
|
return ExprError();
|
|
|
|
BalancedDelimiterTracker T(*this, tok::l_square);
|
|
T.consumeOpen();
|
|
Loc = T.getOpenLocation();
|
|
ExprResult Idx;
|
|
if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
|
|
Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
|
|
Idx = ParseBraceInitializer();
|
|
} else
|
|
Idx = ParseExpression();
|
|
|
|
SourceLocation RLoc = Tok.getLocation();
|
|
|
|
if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) {
|
|
LHS = Actions.ActOnArraySubscriptExpr(getCurScope(), LHS.take(), Loc,
|
|
Idx.take(), RLoc);
|
|
} else
|
|
LHS = ExprError();
|
|
|
|
// Match the ']'.
|
|
T.consumeClose();
|
|
break;
|
|
}
|
|
|
|
case tok::l_paren: // p-e: p-e '(' argument-expression-list[opt] ')'
|
|
case tok::lesslessless: { // p-e: p-e '<<<' argument-expression-list '>>>'
|
|
// '(' argument-expression-list[opt] ')'
|
|
tok::TokenKind OpKind = Tok.getKind();
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
|
|
Expr *ExecConfig = 0;
|
|
|
|
BalancedDelimiterTracker PT(*this, tok::l_paren);
|
|
|
|
if (OpKind == tok::lesslessless) {
|
|
ExprVector ExecConfigExprs;
|
|
CommaLocsTy ExecConfigCommaLocs;
|
|
SourceLocation OpenLoc = ConsumeToken();
|
|
|
|
if (ParseSimpleExpressionList(ExecConfigExprs, ExecConfigCommaLocs)) {
|
|
LHS = ExprError();
|
|
}
|
|
|
|
SourceLocation CloseLoc = Tok.getLocation();
|
|
if (Tok.is(tok::greatergreatergreater)) {
|
|
ConsumeToken();
|
|
} else if (LHS.isInvalid()) {
|
|
SkipUntil(tok::greatergreatergreater, StopAtSemi);
|
|
} else {
|
|
// There was an error closing the brackets
|
|
Diag(Tok, diag::err_expected_ggg);
|
|
Diag(OpenLoc, diag::note_matching) << "<<<";
|
|
SkipUntil(tok::greatergreatergreater, StopAtSemi);
|
|
LHS = ExprError();
|
|
}
|
|
|
|
if (!LHS.isInvalid()) {
|
|
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen, ""))
|
|
LHS = ExprError();
|
|
else
|
|
Loc = PrevTokLocation;
|
|
}
|
|
|
|
if (!LHS.isInvalid()) {
|
|
ExprResult ECResult = Actions.ActOnCUDAExecConfigExpr(getCurScope(),
|
|
OpenLoc,
|
|
ExecConfigExprs,
|
|
CloseLoc);
|
|
if (ECResult.isInvalid())
|
|
LHS = ExprError();
|
|
else
|
|
ExecConfig = ECResult.get();
|
|
}
|
|
} else {
|
|
PT.consumeOpen();
|
|
Loc = PT.getOpenLocation();
|
|
}
|
|
|
|
ExprVector ArgExprs;
|
|
CommaLocsTy CommaLocs;
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteCall(getCurScope(), LHS.get(), None);
|
|
cutOffParsing();
|
|
return ExprError();
|
|
}
|
|
|
|
if (OpKind == tok::l_paren || !LHS.isInvalid()) {
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
if (ParseExpressionList(ArgExprs, CommaLocs, &Sema::CodeCompleteCall,
|
|
LHS.get())) {
|
|
LHS = ExprError();
|
|
}
|
|
}
|
|
}
|
|
|
|
// Match the ')'.
|
|
if (LHS.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
} else if (Tok.isNot(tok::r_paren)) {
|
|
PT.consumeClose();
|
|
LHS = ExprError();
|
|
} else {
|
|
assert((ArgExprs.size() == 0 ||
|
|
ArgExprs.size()-1 == CommaLocs.size())&&
|
|
"Unexpected number of commas!");
|
|
LHS = Actions.ActOnCallExpr(getCurScope(), LHS.take(), Loc,
|
|
ArgExprs, Tok.getLocation(),
|
|
ExecConfig);
|
|
PT.consumeClose();
|
|
}
|
|
|
|
break;
|
|
}
|
|
case tok::arrow:
|
|
case tok::period: {
|
|
// postfix-expression: p-e '->' template[opt] id-expression
|
|
// postfix-expression: p-e '.' template[opt] id-expression
|
|
tok::TokenKind OpKind = Tok.getKind();
|
|
SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
|
|
|
|
CXXScopeSpec SS;
|
|
ParsedType ObjectType;
|
|
bool MayBePseudoDestructor = false;
|
|
if (getLangOpts().CPlusPlus && !LHS.isInvalid()) {
|
|
Expr *Base = LHS.take();
|
|
const Type* BaseType = Base->getType().getTypePtrOrNull();
|
|
if (BaseType && Tok.is(tok::l_paren) &&
|
|
(BaseType->isFunctionType() ||
|
|
BaseType->isSpecificPlaceholderType(BuiltinType::BoundMember))) {
|
|
Diag(OpLoc, diag::err_function_is_not_record)
|
|
<< (OpKind == tok::arrow) << Base->getSourceRange()
|
|
<< FixItHint::CreateRemoval(OpLoc);
|
|
return ParsePostfixExpressionSuffix(Base);
|
|
}
|
|
|
|
LHS = Actions.ActOnStartCXXMemberReference(getCurScope(), Base,
|
|
OpLoc, OpKind, ObjectType,
|
|
MayBePseudoDestructor);
|
|
if (LHS.isInvalid())
|
|
break;
|
|
|
|
ParseOptionalCXXScopeSpecifier(SS, ObjectType,
|
|
/*EnteringContext=*/false,
|
|
&MayBePseudoDestructor);
|
|
if (SS.isNotEmpty())
|
|
ObjectType = ParsedType();
|
|
}
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
// Code completion for a member access expression.
|
|
Actions.CodeCompleteMemberReferenceExpr(getCurScope(), LHS.get(),
|
|
OpLoc, OpKind == tok::arrow);
|
|
|
|
cutOffParsing();
|
|
return ExprError();
|
|
}
|
|
|
|
if (MayBePseudoDestructor && !LHS.isInvalid()) {
|
|
LHS = ParseCXXPseudoDestructor(LHS.take(), OpLoc, OpKind, SS,
|
|
ObjectType);
|
|
break;
|
|
}
|
|
|
|
// Either the action has told is that this cannot be a
|
|
// pseudo-destructor expression (based on the type of base
|
|
// expression), or we didn't see a '~' in the right place. We
|
|
// can still parse a destructor name here, but in that case it
|
|
// names a real destructor.
|
|
// Allow explicit constructor calls in Microsoft mode.
|
|
// FIXME: Add support for explicit call of template constructor.
|
|
SourceLocation TemplateKWLoc;
|
|
UnqualifiedId Name;
|
|
if (getLangOpts().ObjC2 && OpKind == tok::period && Tok.is(tok::kw_class)) {
|
|
// Objective-C++:
|
|
// After a '.' in a member access expression, treat the keyword
|
|
// 'class' as if it were an identifier.
|
|
//
|
|
// This hack allows property access to the 'class' method because it is
|
|
// such a common method name. For other C++ keywords that are
|
|
// Objective-C method names, one must use the message send syntax.
|
|
IdentifierInfo *Id = Tok.getIdentifierInfo();
|
|
SourceLocation Loc = ConsumeToken();
|
|
Name.setIdentifier(Id, Loc);
|
|
} else if (ParseUnqualifiedId(SS,
|
|
/*EnteringContext=*/false,
|
|
/*AllowDestructorName=*/true,
|
|
/*AllowConstructorName=*/
|
|
getLangOpts().MicrosoftExt,
|
|
ObjectType, TemplateKWLoc, Name))
|
|
LHS = ExprError();
|
|
|
|
if (!LHS.isInvalid())
|
|
LHS = Actions.ActOnMemberAccessExpr(getCurScope(), LHS.take(), OpLoc,
|
|
OpKind, SS, TemplateKWLoc, Name,
|
|
CurParsedObjCImpl ? CurParsedObjCImpl->Dcl : 0,
|
|
Tok.is(tok::l_paren));
|
|
break;
|
|
}
|
|
case tok::plusplus: // postfix-expression: postfix-expression '++'
|
|
case tok::minusminus: // postfix-expression: postfix-expression '--'
|
|
if (!LHS.isInvalid()) {
|
|
LHS = Actions.ActOnPostfixUnaryOp(getCurScope(), Tok.getLocation(),
|
|
Tok.getKind(), LHS.take());
|
|
}
|
|
ConsumeToken();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ParseExprAfterUnaryExprOrTypeTrait - We parsed a typeof/sizeof/alignof/
|
|
/// vec_step and we are at the start of an expression or a parenthesized
|
|
/// type-id. OpTok is the operand token (typeof/sizeof/alignof). Returns the
|
|
/// expression (isCastExpr == false) or the type (isCastExpr == true).
|
|
///
|
|
/// \verbatim
|
|
/// unary-expression: [C99 6.5.3]
|
|
/// 'sizeof' unary-expression
|
|
/// 'sizeof' '(' type-name ')'
|
|
/// [GNU] '__alignof' unary-expression
|
|
/// [GNU] '__alignof' '(' type-name ')'
|
|
/// [C11] '_Alignof' '(' type-name ')'
|
|
/// [C++0x] 'alignof' '(' type-id ')'
|
|
///
|
|
/// [GNU] typeof-specifier:
|
|
/// typeof ( expressions )
|
|
/// typeof ( type-name )
|
|
/// [GNU/C++] typeof unary-expression
|
|
///
|
|
/// [OpenCL 1.1 6.11.12] vec_step built-in function:
|
|
/// vec_step ( expressions )
|
|
/// vec_step ( type-name )
|
|
/// \endverbatim
|
|
ExprResult
|
|
Parser::ParseExprAfterUnaryExprOrTypeTrait(const Token &OpTok,
|
|
bool &isCastExpr,
|
|
ParsedType &CastTy,
|
|
SourceRange &CastRange) {
|
|
|
|
assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) ||
|
|
OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof) ||
|
|
OpTok.is(tok::kw__Alignof) || OpTok.is(tok::kw_vec_step)) &&
|
|
"Not a typeof/sizeof/alignof/vec_step expression!");
|
|
|
|
ExprResult Operand;
|
|
|
|
// If the operand doesn't start with an '(', it must be an expression.
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
// If construct allows a form without parenthesis, user may forget to put
|
|
// pathenthesis around type name.
|
|
if (OpTok.is(tok::kw_sizeof) || OpTok.is(tok::kw___alignof) ||
|
|
OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof)) {
|
|
bool isAmbiguousTypeId;
|
|
if (isTypeIdInParens(isAmbiguousTypeId)) {
|
|
DeclSpec DS(AttrFactory);
|
|
ParseSpecifierQualifierList(DS);
|
|
Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
|
|
ParseDeclarator(DeclaratorInfo);
|
|
|
|
SourceLocation LParenLoc = PP.getLocForEndOfToken(OpTok.getLocation());
|
|
SourceLocation RParenLoc = PP.getLocForEndOfToken(PrevTokLocation);
|
|
Diag(LParenLoc, diag::err_expected_parentheses_around_typename)
|
|
<< OpTok.getName()
|
|
<< FixItHint::CreateInsertion(LParenLoc, "(")
|
|
<< FixItHint::CreateInsertion(RParenLoc, ")");
|
|
isCastExpr = true;
|
|
return ExprEmpty();
|
|
}
|
|
}
|
|
|
|
isCastExpr = false;
|
|
if (OpTok.is(tok::kw_typeof) && !getLangOpts().CPlusPlus) {
|
|
Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo();
|
|
return ExprError();
|
|
}
|
|
|
|
Operand = ParseCastExpression(true/*isUnaryExpression*/);
|
|
} else {
|
|
// If it starts with a '(', we know that it is either a parenthesized
|
|
// type-name, or it is a unary-expression that starts with a compound
|
|
// literal, or starts with a primary-expression that is a parenthesized
|
|
// expression.
|
|
ParenParseOption ExprType = CastExpr;
|
|
SourceLocation LParenLoc = Tok.getLocation(), RParenLoc;
|
|
|
|
Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
|
|
false, CastTy, RParenLoc);
|
|
CastRange = SourceRange(LParenLoc, RParenLoc);
|
|
|
|
// If ParseParenExpression parsed a '(typename)' sequence only, then this is
|
|
// a type.
|
|
if (ExprType == CastExpr) {
|
|
isCastExpr = true;
|
|
return ExprEmpty();
|
|
}
|
|
|
|
if (getLangOpts().CPlusPlus || OpTok.isNot(tok::kw_typeof)) {
|
|
// GNU typeof in C requires the expression to be parenthesized. Not so for
|
|
// sizeof/alignof or in C++. Therefore, the parenthesized expression is
|
|
// the start of a unary-expression, but doesn't include any postfix
|
|
// pieces. Parse these now if present.
|
|
if (!Operand.isInvalid())
|
|
Operand = ParsePostfixExpressionSuffix(Operand.get());
|
|
}
|
|
}
|
|
|
|
// If we get here, the operand to the typeof/sizeof/alignof was an expresion.
|
|
isCastExpr = false;
|
|
return Operand;
|
|
}
|
|
|
|
|
|
/// \brief Parse a sizeof or alignof expression.
|
|
///
|
|
/// \verbatim
|
|
/// unary-expression: [C99 6.5.3]
|
|
/// 'sizeof' unary-expression
|
|
/// 'sizeof' '(' type-name ')'
|
|
/// [C++11] 'sizeof' '...' '(' identifier ')'
|
|
/// [GNU] '__alignof' unary-expression
|
|
/// [GNU] '__alignof' '(' type-name ')'
|
|
/// [C11] '_Alignof' '(' type-name ')'
|
|
/// [C++11] 'alignof' '(' type-id ')'
|
|
/// \endverbatim
|
|
ExprResult Parser::ParseUnaryExprOrTypeTraitExpression() {
|
|
assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof) ||
|
|
Tok.is(tok::kw_alignof) || Tok.is(tok::kw__Alignof) ||
|
|
Tok.is(tok::kw_vec_step)) &&
|
|
"Not a sizeof/alignof/vec_step expression!");
|
|
Token OpTok = Tok;
|
|
ConsumeToken();
|
|
|
|
// [C++11] 'sizeof' '...' '(' identifier ')'
|
|
if (Tok.is(tok::ellipsis) && OpTok.is(tok::kw_sizeof)) {
|
|
SourceLocation EllipsisLoc = ConsumeToken();
|
|
SourceLocation LParenLoc, RParenLoc;
|
|
IdentifierInfo *Name = 0;
|
|
SourceLocation NameLoc;
|
|
if (Tok.is(tok::l_paren)) {
|
|
BalancedDelimiterTracker T(*this, tok::l_paren);
|
|
T.consumeOpen();
|
|
LParenLoc = T.getOpenLocation();
|
|
if (Tok.is(tok::identifier)) {
|
|
Name = Tok.getIdentifierInfo();
|
|
NameLoc = ConsumeToken();
|
|
T.consumeClose();
|
|
RParenLoc = T.getCloseLocation();
|
|
if (RParenLoc.isInvalid())
|
|
RParenLoc = PP.getLocForEndOfToken(NameLoc);
|
|
} else {
|
|
Diag(Tok, diag::err_expected_parameter_pack);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
}
|
|
} else if (Tok.is(tok::identifier)) {
|
|
Name = Tok.getIdentifierInfo();
|
|
NameLoc = ConsumeToken();
|
|
LParenLoc = PP.getLocForEndOfToken(EllipsisLoc);
|
|
RParenLoc = PP.getLocForEndOfToken(NameLoc);
|
|
Diag(LParenLoc, diag::err_paren_sizeof_parameter_pack)
|
|
<< Name
|
|
<< FixItHint::CreateInsertion(LParenLoc, "(")
|
|
<< FixItHint::CreateInsertion(RParenLoc, ")");
|
|
} else {
|
|
Diag(Tok, diag::err_sizeof_parameter_pack);
|
|
}
|
|
|
|
if (!Name)
|
|
return ExprError();
|
|
|
|
EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
|
|
Sema::ReuseLambdaContextDecl);
|
|
|
|
return Actions.ActOnSizeofParameterPackExpr(getCurScope(),
|
|
OpTok.getLocation(),
|
|
*Name, NameLoc,
|
|
RParenLoc);
|
|
}
|
|
|
|
if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
|
|
Diag(OpTok, diag::warn_cxx98_compat_alignof);
|
|
|
|
EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated,
|
|
Sema::ReuseLambdaContextDecl);
|
|
|
|
bool isCastExpr;
|
|
ParsedType CastTy;
|
|
SourceRange CastRange;
|
|
ExprResult Operand = ParseExprAfterUnaryExprOrTypeTrait(OpTok,
|
|
isCastExpr,
|
|
CastTy,
|
|
CastRange);
|
|
|
|
UnaryExprOrTypeTrait ExprKind = UETT_SizeOf;
|
|
if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw___alignof) ||
|
|
OpTok.is(tok::kw__Alignof))
|
|
ExprKind = UETT_AlignOf;
|
|
else if (OpTok.is(tok::kw_vec_step))
|
|
ExprKind = UETT_VecStep;
|
|
|
|
if (isCastExpr)
|
|
return Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
|
|
ExprKind,
|
|
/*isType=*/true,
|
|
CastTy.getAsOpaquePtr(),
|
|
CastRange);
|
|
|
|
if (OpTok.is(tok::kw_alignof) || OpTok.is(tok::kw__Alignof))
|
|
Diag(OpTok, diag::ext_alignof_expr) << OpTok.getIdentifierInfo();
|
|
|
|
// If we get here, the operand to the sizeof/alignof was an expresion.
|
|
if (!Operand.isInvalid())
|
|
Operand = Actions.ActOnUnaryExprOrTypeTraitExpr(OpTok.getLocation(),
|
|
ExprKind,
|
|
/*isType=*/false,
|
|
Operand.release(),
|
|
CastRange);
|
|
return Operand;
|
|
}
|
|
|
|
/// ParseBuiltinPrimaryExpression
|
|
///
|
|
/// \verbatim
|
|
/// primary-expression: [C99 6.5.1]
|
|
/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
|
|
/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
|
|
/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
|
|
/// assign-expr ')'
|
|
/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
|
|
/// [OCL] '__builtin_astype' '(' assignment-expression ',' type-name ')'
|
|
///
|
|
/// [GNU] offsetof-member-designator:
|
|
/// [GNU] identifier
|
|
/// [GNU] offsetof-member-designator '.' identifier
|
|
/// [GNU] offsetof-member-designator '[' expression ']'
|
|
/// \endverbatim
|
|
ExprResult Parser::ParseBuiltinPrimaryExpression() {
|
|
ExprResult Res;
|
|
const IdentifierInfo *BuiltinII = Tok.getIdentifierInfo();
|
|
|
|
tok::TokenKind T = Tok.getKind();
|
|
SourceLocation StartLoc = ConsumeToken(); // Eat the builtin identifier.
|
|
|
|
// All of these start with an open paren.
|
|
if (Tok.isNot(tok::l_paren))
|
|
return ExprError(Diag(Tok, diag::err_expected_lparen_after_id)
|
|
<< BuiltinII);
|
|
|
|
BalancedDelimiterTracker PT(*this, tok::l_paren);
|
|
PT.consumeOpen();
|
|
|
|
// TODO: Build AST.
|
|
|
|
switch (T) {
|
|
default: llvm_unreachable("Not a builtin primary expression!");
|
|
case tok::kw___builtin_va_arg: {
|
|
ExprResult Expr(ParseAssignmentExpression());
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
Expr = ExprError();
|
|
|
|
TypeResult Ty = ParseTypeName();
|
|
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
Expr = ExprError();
|
|
}
|
|
|
|
if (Expr.isInvalid() || Ty.isInvalid())
|
|
Res = ExprError();
|
|
else
|
|
Res = Actions.ActOnVAArg(StartLoc, Expr.take(), Ty.get(), ConsumeParen());
|
|
break;
|
|
}
|
|
case tok::kw___builtin_offsetof: {
|
|
SourceLocation TypeLoc = Tok.getLocation();
|
|
TypeResult Ty = ParseTypeName();
|
|
if (Ty.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
// We must have at least one identifier here.
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
// Keep track of the various subcomponents we see.
|
|
SmallVector<Sema::OffsetOfComponent, 4> Comps;
|
|
|
|
Comps.push_back(Sema::OffsetOfComponent());
|
|
Comps.back().isBrackets = false;
|
|
Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
|
|
Comps.back().LocStart = Comps.back().LocEnd = ConsumeToken();
|
|
|
|
// FIXME: This loop leaks the index expressions on error.
|
|
while (1) {
|
|
if (Tok.is(tok::period)) {
|
|
// offsetof-member-designator: offsetof-member-designator '.' identifier
|
|
Comps.push_back(Sema::OffsetOfComponent());
|
|
Comps.back().isBrackets = false;
|
|
Comps.back().LocStart = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
|
|
Comps.back().LocEnd = ConsumeToken();
|
|
|
|
} else if (Tok.is(tok::l_square)) {
|
|
if (CheckProhibitedCXX11Attribute())
|
|
return ExprError();
|
|
|
|
// offsetof-member-designator: offsetof-member-design '[' expression ']'
|
|
Comps.push_back(Sema::OffsetOfComponent());
|
|
Comps.back().isBrackets = true;
|
|
BalancedDelimiterTracker ST(*this, tok::l_square);
|
|
ST.consumeOpen();
|
|
Comps.back().LocStart = ST.getOpenLocation();
|
|
Res = ParseExpression();
|
|
if (Res.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return Res;
|
|
}
|
|
Comps.back().U.E = Res.release();
|
|
|
|
ST.consumeClose();
|
|
Comps.back().LocEnd = ST.getCloseLocation();
|
|
} else {
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
PT.consumeClose();
|
|
Res = ExprError();
|
|
} else if (Ty.isInvalid()) {
|
|
Res = ExprError();
|
|
} else {
|
|
PT.consumeClose();
|
|
Res = Actions.ActOnBuiltinOffsetOf(getCurScope(), StartLoc, TypeLoc,
|
|
Ty.get(), &Comps[0], Comps.size(),
|
|
PT.getCloseLocation());
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case tok::kw___builtin_choose_expr: {
|
|
ExprResult Cond(ParseAssignmentExpression());
|
|
if (Cond.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return Cond;
|
|
}
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
ExprResult Expr1(ParseAssignmentExpression());
|
|
if (Expr1.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return Expr1;
|
|
}
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
ExprResult Expr2(ParseAssignmentExpression());
|
|
if (Expr2.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return Expr2;
|
|
}
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
return ExprError();
|
|
}
|
|
Res = Actions.ActOnChooseExpr(StartLoc, Cond.take(), Expr1.take(),
|
|
Expr2.take(), ConsumeParen());
|
|
break;
|
|
}
|
|
case tok::kw___builtin_astype: {
|
|
// The first argument is an expression to be converted, followed by a comma.
|
|
ExprResult Expr(ParseAssignmentExpression());
|
|
if (Expr.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",
|
|
tok::r_paren))
|
|
return ExprError();
|
|
|
|
// Second argument is the type to bitcast to.
|
|
TypeResult DestTy = ParseTypeName();
|
|
if (DestTy.isInvalid())
|
|
return ExprError();
|
|
|
|
// Attempt to consume the r-paren.
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
Res = Actions.ActOnAsTypeExpr(Expr.take(), DestTy.get(), StartLoc,
|
|
ConsumeParen());
|
|
break;
|
|
}
|
|
case tok::kw___builtin_convertvector: {
|
|
// The first argument is an expression to be converted, followed by a comma.
|
|
ExprResult Expr(ParseAssignmentExpression());
|
|
if (Expr.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",
|
|
tok::r_paren))
|
|
return ExprError();
|
|
|
|
// Second argument is the type to bitcast to.
|
|
TypeResult DestTy = ParseTypeName();
|
|
if (DestTy.isInvalid())
|
|
return ExprError();
|
|
|
|
// Attempt to consume the r-paren.
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
Res = Actions.ActOnConvertVectorExpr(Expr.take(), DestTy.get(), StartLoc,
|
|
ConsumeParen());
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (Res.isInvalid())
|
|
return ExprError();
|
|
|
|
// These can be followed by postfix-expr pieces because they are
|
|
// primary-expressions.
|
|
return ParsePostfixExpressionSuffix(Res.take());
|
|
}
|
|
|
|
/// ParseParenExpression - This parses the unit that starts with a '(' token,
|
|
/// based on what is allowed by ExprType. The actual thing parsed is returned
|
|
/// in ExprType. If stopIfCastExpr is true, it will only return the parsed type,
|
|
/// not the parsed cast-expression.
|
|
///
|
|
/// \verbatim
|
|
/// primary-expression: [C99 6.5.1]
|
|
/// '(' expression ')'
|
|
/// [GNU] '(' compound-statement ')' (if !ParenExprOnly)
|
|
/// postfix-expression: [C99 6.5.2]
|
|
/// '(' type-name ')' '{' initializer-list '}'
|
|
/// '(' type-name ')' '{' initializer-list ',' '}'
|
|
/// cast-expression: [C99 6.5.4]
|
|
/// '(' type-name ')' cast-expression
|
|
/// [ARC] bridged-cast-expression
|
|
///
|
|
/// [ARC] bridged-cast-expression:
|
|
/// (__bridge type-name) cast-expression
|
|
/// (__bridge_transfer type-name) cast-expression
|
|
/// (__bridge_retained type-name) cast-expression
|
|
/// \endverbatim
|
|
ExprResult
|
|
Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
|
|
bool isTypeCast, ParsedType &CastTy,
|
|
SourceLocation &RParenLoc) {
|
|
assert(Tok.is(tok::l_paren) && "Not a paren expr!");
|
|
BalancedDelimiterTracker T(*this, tok::l_paren);
|
|
if (T.consumeOpen())
|
|
return ExprError();
|
|
SourceLocation OpenLoc = T.getOpenLocation();
|
|
|
|
ExprResult Result(true);
|
|
bool isAmbiguousTypeId;
|
|
CastTy = ParsedType();
|
|
|
|
if (Tok.is(tok::code_completion)) {
|
|
Actions.CodeCompleteOrdinaryName(getCurScope(),
|
|
ExprType >= CompoundLiteral? Sema::PCC_ParenthesizedExpression
|
|
: Sema::PCC_Expression);
|
|
cutOffParsing();
|
|
return ExprError();
|
|
}
|
|
|
|
// Diagnose use of bridge casts in non-arc mode.
|
|
bool BridgeCast = (getLangOpts().ObjC2 &&
|
|
(Tok.is(tok::kw___bridge) ||
|
|
Tok.is(tok::kw___bridge_transfer) ||
|
|
Tok.is(tok::kw___bridge_retained) ||
|
|
Tok.is(tok::kw___bridge_retain)));
|
|
if (BridgeCast && !getLangOpts().ObjCAutoRefCount) {
|
|
if (Tok.isNot(tok::kw___bridge)) {
|
|
StringRef BridgeCastName = Tok.getName();
|
|
SourceLocation BridgeKeywordLoc = ConsumeToken();
|
|
if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
|
|
Diag(BridgeKeywordLoc, diag::warn_arc_bridge_cast_nonarc)
|
|
<< BridgeCastName
|
|
<< FixItHint::CreateReplacement(BridgeKeywordLoc, "");
|
|
}
|
|
else
|
|
ConsumeToken(); // consume __bridge
|
|
BridgeCast = false;
|
|
}
|
|
|
|
// None of these cases should fall through with an invalid Result
|
|
// unless they've already reported an error.
|
|
if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
|
|
Diag(Tok, diag::ext_gnu_statement_expr);
|
|
Actions.ActOnStartStmtExpr();
|
|
|
|
StmtResult Stmt(ParseCompoundStatement(true));
|
|
ExprType = CompoundStmt;
|
|
|
|
// If the substmt parsed correctly, build the AST node.
|
|
if (!Stmt.isInvalid()) {
|
|
Result = Actions.ActOnStmtExpr(OpenLoc, Stmt.take(), Tok.getLocation());
|
|
} else {
|
|
Actions.ActOnStmtExprError();
|
|
}
|
|
} else if (ExprType >= CompoundLiteral && BridgeCast) {
|
|
tok::TokenKind tokenKind = Tok.getKind();
|
|
SourceLocation BridgeKeywordLoc = ConsumeToken();
|
|
|
|
// Parse an Objective-C ARC ownership cast expression.
|
|
ObjCBridgeCastKind Kind;
|
|
if (tokenKind == tok::kw___bridge)
|
|
Kind = OBC_Bridge;
|
|
else if (tokenKind == tok::kw___bridge_transfer)
|
|
Kind = OBC_BridgeTransfer;
|
|
else if (tokenKind == tok::kw___bridge_retained)
|
|
Kind = OBC_BridgeRetained;
|
|
else {
|
|
// As a hopefully temporary workaround, allow __bridge_retain as
|
|
// a synonym for __bridge_retained, but only in system headers.
|
|
assert(tokenKind == tok::kw___bridge_retain);
|
|
Kind = OBC_BridgeRetained;
|
|
if (!PP.getSourceManager().isInSystemHeader(BridgeKeywordLoc))
|
|
Diag(BridgeKeywordLoc, diag::err_arc_bridge_retain)
|
|
<< FixItHint::CreateReplacement(BridgeKeywordLoc,
|
|
"__bridge_retained");
|
|
}
|
|
|
|
TypeResult Ty = ParseTypeName();
|
|
T.consumeClose();
|
|
RParenLoc = T.getCloseLocation();
|
|
ExprResult SubExpr = ParseCastExpression(/*isUnaryExpression=*/false);
|
|
|
|
if (Ty.isInvalid() || SubExpr.isInvalid())
|
|
return ExprError();
|
|
|
|
return Actions.ActOnObjCBridgedCast(getCurScope(), OpenLoc, Kind,
|
|
BridgeKeywordLoc, Ty.get(),
|
|
RParenLoc, SubExpr.get());
|
|
} else if (ExprType >= CompoundLiteral &&
|
|
isTypeIdInParens(isAmbiguousTypeId)) {
|
|
|
|
// Otherwise, this is a compound literal expression or cast expression.
|
|
|
|
// In C++, if the type-id is ambiguous we disambiguate based on context.
|
|
// If stopIfCastExpr is true the context is a typeof/sizeof/alignof
|
|
// in which case we should treat it as type-id.
|
|
// if stopIfCastExpr is false, we need to determine the context past the
|
|
// parens, so we defer to ParseCXXAmbiguousParenExpression for that.
|
|
if (isAmbiguousTypeId && !stopIfCastExpr) {
|
|
ExprResult res = ParseCXXAmbiguousParenExpression(ExprType, CastTy, T);
|
|
RParenLoc = T.getCloseLocation();
|
|
return res;
|
|
}
|
|
|
|
// Parse the type declarator.
|
|
DeclSpec DS(AttrFactory);
|
|
ParseSpecifierQualifierList(DS);
|
|
Declarator DeclaratorInfo(DS, Declarator::TypeNameContext);
|
|
ParseDeclarator(DeclaratorInfo);
|
|
|
|
// If our type is followed by an identifier and either ':' or ']', then
|
|
// this is probably an Objective-C message send where the leading '[' is
|
|
// missing. Recover as if that were the case.
|
|
if (!DeclaratorInfo.isInvalidType() && Tok.is(tok::identifier) &&
|
|
!InMessageExpression && getLangOpts().ObjC1 &&
|
|
(NextToken().is(tok::colon) || NextToken().is(tok::r_square))) {
|
|
TypeResult Ty;
|
|
{
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
|
|
}
|
|
Result = ParseObjCMessageExpressionBody(SourceLocation(),
|
|
SourceLocation(),
|
|
Ty.get(), 0);
|
|
} else {
|
|
// Match the ')'.
|
|
T.consumeClose();
|
|
RParenLoc = T.getCloseLocation();
|
|
if (Tok.is(tok::l_brace)) {
|
|
ExprType = CompoundLiteral;
|
|
TypeResult Ty;
|
|
{
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
|
|
}
|
|
return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
|
|
}
|
|
|
|
if (ExprType == CastExpr) {
|
|
// We parsed '(' type-name ')' and the thing after it wasn't a '{'.
|
|
|
|
if (DeclaratorInfo.isInvalidType())
|
|
return ExprError();
|
|
|
|
// Note that this doesn't parse the subsequent cast-expression, it just
|
|
// returns the parsed type to the callee.
|
|
if (stopIfCastExpr) {
|
|
TypeResult Ty;
|
|
{
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
Ty = Actions.ActOnTypeName(getCurScope(), DeclaratorInfo);
|
|
}
|
|
CastTy = Ty.get();
|
|
return ExprResult();
|
|
}
|
|
|
|
// Reject the cast of super idiom in ObjC.
|
|
if (Tok.is(tok::identifier) && getLangOpts().ObjC1 &&
|
|
Tok.getIdentifierInfo() == Ident_super &&
|
|
getCurScope()->isInObjcMethodScope() &&
|
|
GetLookAheadToken(1).isNot(tok::period)) {
|
|
Diag(Tok.getLocation(), diag::err_illegal_super_cast)
|
|
<< SourceRange(OpenLoc, RParenLoc);
|
|
return ExprError();
|
|
}
|
|
|
|
// Parse the cast-expression that follows it next.
|
|
// TODO: For cast expression with CastTy.
|
|
Result = ParseCastExpression(/*isUnaryExpression=*/false,
|
|
/*isAddressOfOperand=*/false,
|
|
/*isTypeCast=*/IsTypeCast);
|
|
if (!Result.isInvalid()) {
|
|
Result = Actions.ActOnCastExpr(getCurScope(), OpenLoc,
|
|
DeclaratorInfo, CastTy,
|
|
RParenLoc, Result.take());
|
|
}
|
|
return Result;
|
|
}
|
|
|
|
Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
|
|
return ExprError();
|
|
}
|
|
} else if (isTypeCast) {
|
|
// Parse the expression-list.
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
|
|
ExprVector ArgExprs;
|
|
CommaLocsTy CommaLocs;
|
|
|
|
if (!ParseSimpleExpressionList(ArgExprs, CommaLocs)) {
|
|
ExprType = SimpleExpr;
|
|
Result = Actions.ActOnParenListExpr(OpenLoc, Tok.getLocation(),
|
|
ArgExprs);
|
|
}
|
|
} else {
|
|
InMessageExpressionRAIIObject InMessage(*this, false);
|
|
|
|
Result = ParseExpression(MaybeTypeCast);
|
|
ExprType = SimpleExpr;
|
|
|
|
// Don't build a paren expression unless we actually match a ')'.
|
|
if (!Result.isInvalid() && Tok.is(tok::r_paren))
|
|
Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), Result.take());
|
|
}
|
|
|
|
// Match the ')'.
|
|
if (Result.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
T.consumeClose();
|
|
RParenLoc = T.getCloseLocation();
|
|
return Result;
|
|
}
|
|
|
|
/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
|
|
/// and we are at the left brace.
|
|
///
|
|
/// \verbatim
|
|
/// postfix-expression: [C99 6.5.2]
|
|
/// '(' type-name ')' '{' initializer-list '}'
|
|
/// '(' type-name ')' '{' initializer-list ',' '}'
|
|
/// \endverbatim
|
|
ExprResult
|
|
Parser::ParseCompoundLiteralExpression(ParsedType Ty,
|
|
SourceLocation LParenLoc,
|
|
SourceLocation RParenLoc) {
|
|
assert(Tok.is(tok::l_brace) && "Not a compound literal!");
|
|
if (!getLangOpts().C99) // Compound literals don't exist in C90.
|
|
Diag(LParenLoc, diag::ext_c99_compound_literal);
|
|
ExprResult Result = ParseInitializer();
|
|
if (!Result.isInvalid() && Ty)
|
|
return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, Result.take());
|
|
return Result;
|
|
}
|
|
|
|
/// ParseStringLiteralExpression - This handles the various token types that
|
|
/// form string literals, and also handles string concatenation [C99 5.1.1.2,
|
|
/// translation phase #6].
|
|
///
|
|
/// \verbatim
|
|
/// primary-expression: [C99 6.5.1]
|
|
/// string-literal
|
|
/// \verbatim
|
|
ExprResult Parser::ParseStringLiteralExpression(bool AllowUserDefinedLiteral) {
|
|
assert(isTokenStringLiteral() && "Not a string literal!");
|
|
|
|
// String concat. Note that keywords like __func__ and __FUNCTION__ are not
|
|
// considered to be strings for concatenation purposes.
|
|
SmallVector<Token, 4> StringToks;
|
|
|
|
do {
|
|
StringToks.push_back(Tok);
|
|
ConsumeStringToken();
|
|
} while (isTokenStringLiteral());
|
|
|
|
// Pass the set of string tokens, ready for concatenation, to the actions.
|
|
return Actions.ActOnStringLiteral(&StringToks[0], StringToks.size(),
|
|
AllowUserDefinedLiteral ? getCurScope() : 0);
|
|
}
|
|
|
|
/// ParseGenericSelectionExpression - Parse a C11 generic-selection
|
|
/// [C11 6.5.1.1].
|
|
///
|
|
/// \verbatim
|
|
/// generic-selection:
|
|
/// _Generic ( assignment-expression , generic-assoc-list )
|
|
/// generic-assoc-list:
|
|
/// generic-association
|
|
/// generic-assoc-list , generic-association
|
|
/// generic-association:
|
|
/// type-name : assignment-expression
|
|
/// default : assignment-expression
|
|
/// \endverbatim
|
|
ExprResult Parser::ParseGenericSelectionExpression() {
|
|
assert(Tok.is(tok::kw__Generic) && "_Generic keyword expected");
|
|
SourceLocation KeyLoc = ConsumeToken();
|
|
|
|
if (!getLangOpts().C11)
|
|
Diag(KeyLoc, diag::ext_c11_generic_selection);
|
|
|
|
BalancedDelimiterTracker T(*this, tok::l_paren);
|
|
if (T.expectAndConsume(diag::err_expected_lparen))
|
|
return ExprError();
|
|
|
|
ExprResult ControllingExpr;
|
|
{
|
|
// C11 6.5.1.1p3 "The controlling expression of a generic selection is
|
|
// not evaluated."
|
|
EnterExpressionEvaluationContext Unevaluated(Actions, Sema::Unevaluated);
|
|
ControllingExpr = ParseAssignmentExpression();
|
|
if (ControllingExpr.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
}
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "")) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
SourceLocation DefaultLoc;
|
|
TypeVector Types;
|
|
ExprVector Exprs;
|
|
while (1) {
|
|
ParsedType Ty;
|
|
if (Tok.is(tok::kw_default)) {
|
|
// C11 6.5.1.1p2 "A generic selection shall have no more than one default
|
|
// generic association."
|
|
if (!DefaultLoc.isInvalid()) {
|
|
Diag(Tok, diag::err_duplicate_default_assoc);
|
|
Diag(DefaultLoc, diag::note_previous_default_assoc);
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
DefaultLoc = ConsumeToken();
|
|
Ty = ParsedType();
|
|
} else {
|
|
ColonProtectionRAIIObject X(*this);
|
|
TypeResult TR = ParseTypeName();
|
|
if (TR.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
Ty = TR.release();
|
|
}
|
|
Types.push_back(Ty);
|
|
|
|
if (ExpectAndConsume(tok::colon, diag::err_expected_colon, "")) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
|
|
// FIXME: These expressions should be parsed in a potentially potentially
|
|
// evaluated context.
|
|
ExprResult ER(ParseAssignmentExpression());
|
|
if (ER.isInvalid()) {
|
|
SkipUntil(tok::r_paren, StopAtSemi);
|
|
return ExprError();
|
|
}
|
|
Exprs.push_back(ER.release());
|
|
|
|
if (Tok.isNot(tok::comma))
|
|
break;
|
|
ConsumeToken();
|
|
}
|
|
|
|
T.consumeClose();
|
|
if (T.getCloseLocation().isInvalid())
|
|
return ExprError();
|
|
|
|
return Actions.ActOnGenericSelectionExpr(KeyLoc, DefaultLoc,
|
|
T.getCloseLocation(),
|
|
ControllingExpr.release(),
|
|
Types, Exprs);
|
|
}
|
|
|
|
/// ParseExpressionList - Used for C/C++ (argument-)expression-list.
|
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///
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/// \verbatim
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/// argument-expression-list:
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/// assignment-expression
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/// argument-expression-list , assignment-expression
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///
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/// [C++] expression-list:
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/// [C++] assignment-expression
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/// [C++] expression-list , assignment-expression
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///
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/// [C++0x] expression-list:
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/// [C++0x] initializer-list
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///
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/// [C++0x] initializer-list
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/// [C++0x] initializer-clause ...[opt]
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/// [C++0x] initializer-list , initializer-clause ...[opt]
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///
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/// [C++0x] initializer-clause:
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/// [C++0x] assignment-expression
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/// [C++0x] braced-init-list
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/// \endverbatim
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bool Parser::ParseExpressionList(SmallVectorImpl<Expr*> &Exprs,
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SmallVectorImpl<SourceLocation> &CommaLocs,
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void (Sema::*Completer)(Scope *S,
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Expr *Data,
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ArrayRef<Expr *> Args),
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Expr *Data) {
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while (1) {
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if (Tok.is(tok::code_completion)) {
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if (Completer)
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(Actions.*Completer)(getCurScope(), Data, Exprs);
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else
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Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Expression);
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cutOffParsing();
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return true;
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}
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ExprResult Expr;
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if (getLangOpts().CPlusPlus11 && Tok.is(tok::l_brace)) {
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Diag(Tok, diag::warn_cxx98_compat_generalized_initializer_lists);
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Expr = ParseBraceInitializer();
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} else
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Expr = ParseAssignmentExpression();
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if (Tok.is(tok::ellipsis))
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Expr = Actions.ActOnPackExpansion(Expr.get(), ConsumeToken());
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if (Expr.isInvalid())
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return true;
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Exprs.push_back(Expr.release());
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if (Tok.isNot(tok::comma))
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return false;
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// Move to the next argument, remember where the comma was.
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CommaLocs.push_back(ConsumeToken());
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}
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}
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/// ParseSimpleExpressionList - A simple comma-separated list of expressions,
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/// used for misc language extensions.
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///
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/// \verbatim
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/// simple-expression-list:
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/// assignment-expression
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/// simple-expression-list , assignment-expression
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/// \endverbatim
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bool
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Parser::ParseSimpleExpressionList(SmallVectorImpl<Expr*> &Exprs,
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SmallVectorImpl<SourceLocation> &CommaLocs) {
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while (1) {
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ExprResult Expr = ParseAssignmentExpression();
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if (Expr.isInvalid())
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return true;
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Exprs.push_back(Expr.release());
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if (Tok.isNot(tok::comma))
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return false;
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// Move to the next argument, remember where the comma was.
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CommaLocs.push_back(ConsumeToken());
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}
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}
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/// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
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///
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/// \verbatim
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/// [clang] block-id:
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/// [clang] specifier-qualifier-list block-declarator
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/// \endverbatim
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void Parser::ParseBlockId(SourceLocation CaretLoc) {
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if (Tok.is(tok::code_completion)) {
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Actions.CodeCompleteOrdinaryName(getCurScope(), Sema::PCC_Type);
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return cutOffParsing();
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}
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// Parse the specifier-qualifier-list piece.
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DeclSpec DS(AttrFactory);
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ParseSpecifierQualifierList(DS);
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// Parse the block-declarator.
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Declarator DeclaratorInfo(DS, Declarator::BlockLiteralContext);
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ParseDeclarator(DeclaratorInfo);
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// We do this for: ^ __attribute__((noreturn)) {, as DS has the attributes.
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DeclaratorInfo.takeAttributes(DS.getAttributes(), SourceLocation());
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MaybeParseGNUAttributes(DeclaratorInfo);
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(CaretLoc, DeclaratorInfo, getCurScope());
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}
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/// ParseBlockLiteralExpression - Parse a block literal, which roughly looks
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/// like ^(int x){ return x+1; }
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///
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/// \verbatim
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/// block-literal:
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/// [clang] '^' block-args[opt] compound-statement
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/// [clang] '^' block-id compound-statement
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/// [clang] block-args:
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/// [clang] '(' parameter-list ')'
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/// \endverbatim
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ExprResult Parser::ParseBlockLiteralExpression() {
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assert(Tok.is(tok::caret) && "block literal starts with ^");
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SourceLocation CaretLoc = ConsumeToken();
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PrettyStackTraceLoc CrashInfo(PP.getSourceManager(), CaretLoc,
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"block literal parsing");
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// Enter a scope to hold everything within the block. This includes the
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// argument decls, decls within the compound expression, etc. This also
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// allows determining whether a variable reference inside the block is
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// within or outside of the block.
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ParseScope BlockScope(this, Scope::BlockScope | Scope::FnScope |
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Scope::DeclScope);
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// Inform sema that we are starting a block.
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Actions.ActOnBlockStart(CaretLoc, getCurScope());
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// Parse the return type if present.
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DeclSpec DS(AttrFactory);
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Declarator ParamInfo(DS, Declarator::BlockLiteralContext);
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// FIXME: Since the return type isn't actually parsed, it can't be used to
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// fill ParamInfo with an initial valid range, so do it manually.
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ParamInfo.SetSourceRange(SourceRange(Tok.getLocation(), Tok.getLocation()));
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// If this block has arguments, parse them. There is no ambiguity here with
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// the expression case, because the expression case requires a parameter list.
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if (Tok.is(tok::l_paren)) {
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ParseParenDeclarator(ParamInfo);
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// Parse the pieces after the identifier as if we had "int(...)".
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// SetIdentifier sets the source range end, but in this case we're past
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// that location.
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SourceLocation Tmp = ParamInfo.getSourceRange().getEnd();
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ParamInfo.SetIdentifier(0, CaretLoc);
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ParamInfo.SetRangeEnd(Tmp);
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if (ParamInfo.isInvalidType()) {
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// If there was an error parsing the arguments, they may have
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// tried to use ^(x+y) which requires an argument list. Just
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// skip the whole block literal.
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Actions.ActOnBlockError(CaretLoc, getCurScope());
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return ExprError();
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}
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MaybeParseGNUAttributes(ParamInfo);
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
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} else if (!Tok.is(tok::l_brace)) {
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ParseBlockId(CaretLoc);
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} else {
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// Otherwise, pretend we saw (void).
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ParsedAttributes attrs(AttrFactory);
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SourceLocation NoLoc;
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ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(/*HasProto=*/true,
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/*IsAmbiguous=*/false,
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/*RParenLoc=*/NoLoc,
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/*ArgInfo=*/0,
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/*NumArgs=*/0,
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/*EllipsisLoc=*/NoLoc,
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/*RParenLoc=*/NoLoc,
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/*TypeQuals=*/0,
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/*RefQualifierIsLvalueRef=*/true,
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/*RefQualifierLoc=*/NoLoc,
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/*ConstQualifierLoc=*/NoLoc,
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/*VolatileQualifierLoc=*/NoLoc,
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/*MutableLoc=*/NoLoc,
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EST_None,
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/*ESpecLoc=*/NoLoc,
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/*Exceptions=*/0,
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/*ExceptionRanges=*/0,
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/*NumExceptions=*/0,
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/*NoexceptExpr=*/0,
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CaretLoc, CaretLoc,
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ParamInfo),
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attrs, CaretLoc);
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MaybeParseGNUAttributes(ParamInfo);
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(CaretLoc, ParamInfo, getCurScope());
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}
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ExprResult Result(true);
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if (!Tok.is(tok::l_brace)) {
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// Saw something like: ^expr
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Diag(Tok, diag::err_expected_expression);
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Actions.ActOnBlockError(CaretLoc, getCurScope());
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return ExprError();
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}
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StmtResult Stmt(ParseCompoundStatementBody());
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BlockScope.Exit();
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if (!Stmt.isInvalid())
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Result = Actions.ActOnBlockStmtExpr(CaretLoc, Stmt.take(), getCurScope());
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else
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Actions.ActOnBlockError(CaretLoc, getCurScope());
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return Result;
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}
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/// ParseObjCBoolLiteral - This handles the objective-c Boolean literals.
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///
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/// '__objc_yes'
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/// '__objc_no'
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ExprResult Parser::ParseObjCBoolLiteral() {
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tok::TokenKind Kind = Tok.getKind();
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return Actions.ActOnObjCBoolLiteral(ConsumeToken(), Kind);
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}
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