forked from OSchip/llvm-project
1547 lines
58 KiB
C++
1547 lines
58 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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// This file implements the Expression parsing implementation. Expressions in
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// C99 basically consist of a bunch of binary operators with unary operators and
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// 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 "clang/Parse/DeclSpec.h"
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#include "clang/Parse/Scope.h"
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#include "clang/Basic/PrettyStackTrace.h"
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#include "ExtensionRAIIObject.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/SmallString.h"
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using namespace clang;
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/// PrecedenceLevels - These are precedences for the binary/ternary operators in
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/// the C99 grammar. These have been named to relate with the C99 grammar
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/// productions. Low precedences numbers bind more weakly than high numbers.
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namespace prec {
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enum Level {
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Unknown = 0, // Not binary operator.
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Comma = 1, // ,
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Assignment = 2, // =, *=, /=, %=, +=, -=, <<=, >>=, &=, ^=, |=
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Conditional = 3, // ?
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LogicalOr = 4, // ||
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LogicalAnd = 5, // &&
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InclusiveOr = 6, // |
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ExclusiveOr = 7, // ^
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And = 8, // &
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Equality = 9, // ==, !=
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Relational = 10, // >=, <=, >, <
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Shift = 11, // <<, >>
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Additive = 12, // -, +
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Multiplicative = 13, // *, /, %
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PointerToMember = 14 // .*, ->*
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};
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}
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/// getBinOpPrecedence - Return the precedence of the specified binary operator
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/// token. This returns:
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///
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static prec::Level getBinOpPrecedence(tok::TokenKind Kind,
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bool GreaterThanIsOperator,
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bool CPlusPlus0x) {
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switch (Kind) {
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case tok::greater:
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// C++ [temp.names]p3:
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// [...] When parsing a template-argument-list, the first
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// non-nested > is taken as the ending delimiter rather than a
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// greater-than operator. [...]
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if (GreaterThanIsOperator)
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return prec::Relational;
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return prec::Unknown;
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case tok::greatergreater:
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// C++0x [temp.names]p3:
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//
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// [...] Similarly, the first non-nested >> is treated as two
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// consecutive but distinct > tokens, the first of which is
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// taken as the end of the template-argument-list and completes
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// the template-id. [...]
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if (GreaterThanIsOperator || !CPlusPlus0x)
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return prec::Shift;
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return prec::Unknown;
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default: return prec::Unknown;
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case tok::comma: return prec::Comma;
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case tok::equal:
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case tok::starequal:
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case tok::slashequal:
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case tok::percentequal:
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case tok::plusequal:
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case tok::minusequal:
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case tok::lesslessequal:
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case tok::greatergreaterequal:
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case tok::ampequal:
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case tok::caretequal:
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case tok::pipeequal: return prec::Assignment;
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case tok::question: return prec::Conditional;
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case tok::pipepipe: return prec::LogicalOr;
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case tok::ampamp: return prec::LogicalAnd;
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case tok::pipe: return prec::InclusiveOr;
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case tok::caret: return prec::ExclusiveOr;
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case tok::amp: return prec::And;
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case tok::exclaimequal:
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case tok::equalequal: return prec::Equality;
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case tok::lessequal:
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case tok::less:
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case tok::greaterequal: return prec::Relational;
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case tok::lessless: return prec::Shift;
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case tok::plus:
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case tok::minus: return prec::Additive;
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case tok::percent:
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case tok::slash:
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case tok::star: return prec::Multiplicative;
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case tok::periodstar:
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case tok::arrowstar: return prec::PointerToMember;
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}
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}
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/// ParseExpression - Simple precedence-based parser for binary/ternary
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/// 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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/// 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
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/// expression ',' assignment-expression
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///
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Parser::OwningExprResult Parser::ParseExpression() {
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OwningExprResult LHS(ParseAssignmentExpression());
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if (LHS.isInvalid()) return move(LHS);
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return ParseRHSOfBinaryExpression(move(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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Parser::OwningExprResult
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Parser::ParseExpressionWithLeadingAt(SourceLocation AtLoc) {
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OwningExprResult LHS(ParseObjCAtExpression(AtLoc));
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if (LHS.isInvalid()) return move(LHS);
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return ParseRHSOfBinaryExpression(move(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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Parser::OwningExprResult
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Parser::ParseExpressionWithLeadingExtension(SourceLocation ExtLoc) {
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OwningExprResult LHS(Actions, 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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if (LHS.isInvalid()) return move(LHS);
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}
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LHS = Actions.ActOnUnaryOp(CurScope, ExtLoc, tok::kw___extension__,
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move(LHS));
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if (LHS.isInvalid()) return move(LHS);
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return ParseRHSOfBinaryExpression(move(LHS), prec::Comma);
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}
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/// ParseAssignmentExpression - Parse an expr that doesn't include commas.
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///
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Parser::OwningExprResult Parser::ParseAssignmentExpression() {
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if (Tok.is(tok::kw_throw))
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return ParseThrowExpression();
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OwningExprResult LHS(ParseCastExpression(false));
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if (LHS.isInvalid()) return move(LHS);
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return ParseRHSOfBinaryExpression(move(LHS), prec::Assignment);
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}
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/// ParseAssignmentExprWithObjCMessageExprStart - Parse an assignment expression
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/// where part of an objc message send has already been parsed. In this case
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/// LBracLoc indicates the location of the '[' of the message send, and either
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/// ReceiverName or ReceiverExpr is non-null indicating the receiver of the
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/// 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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Parser::OwningExprResult
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Parser::ParseAssignmentExprWithObjCMessageExprStart(SourceLocation LBracLoc,
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SourceLocation NameLoc,
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IdentifierInfo *ReceiverName,
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ExprArg ReceiverExpr) {
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OwningExprResult R(ParseObjCMessageExpressionBody(LBracLoc, NameLoc,
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ReceiverName,
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move(ReceiverExpr)));
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if (R.isInvalid()) return move(R);
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R = ParsePostfixExpressionSuffix(move(R));
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if (R.isInvalid()) return move(R);
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return ParseRHSOfBinaryExpression(move(R), prec::Assignment);
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}
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Parser::OwningExprResult Parser::ParseConstantExpression() {
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// C++ [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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EnterExpressionEvaluationContext Unevaluated(Actions,
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Action::Unevaluated);
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OwningExprResult LHS(ParseCastExpression(false));
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if (LHS.isInvalid()) return move(LHS);
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return ParseRHSOfBinaryExpression(move(LHS), prec::Conditional);
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}
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/// ParseRHSOfBinaryExpression - Parse a binary expression that starts with
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/// LHS and has a precedence of at least MinPrec.
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Parser::OwningExprResult
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Parser::ParseRHSOfBinaryExpression(OwningExprResult LHS, unsigned MinPrec) {
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unsigned NextTokPrec = getBinOpPrecedence(Tok.getKind(),
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GreaterThanIsOperator,
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getLang().CPlusPlus0x);
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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 move(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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// Special case handling for the ternary operator.
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OwningExprResult TernaryMiddle(Actions, true);
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if (NextTokPrec == prec::Conditional) {
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if (Tok.isNot(tok::colon)) {
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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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return move(TernaryMiddle);
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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.isNot(tok::colon)) {
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Diag(Tok, diag::err_expected_colon);
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Diag(OpToken, diag::note_matching) << "?";
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return ExprError();
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}
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// Eat the colon.
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ColonLoc = ConsumeToken();
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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++.
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OwningExprResult RHS(Actions);
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if (getLang().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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return move(RHS);
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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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unsigned ThisPrec = NextTokPrec;
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NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
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getLang().CPlusPlus0x);
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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 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(move(RHS), ThisPrec + !isRightAssoc);
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if (RHS.isInvalid())
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return move(RHS);
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NextTokPrec = getBinOpPrecedence(Tok.getKind(), GreaterThanIsOperator,
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getLang().CPlusPlus0x);
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}
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assert(NextTokPrec <= ThisPrec && "Recursion didn't work!");
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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_cxx0x_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(CurScope, OpToken.getLocation(),
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OpToken.getKind(), move(LHS), move(RHS));
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} else
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LHS = Actions.ActOnConditionalOp(OpToken.getLocation(), ColonLoc,
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move(LHS), move(TernaryMiddle),
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move(RHS));
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}
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}
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}
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/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is
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/// true, parse a unary-expression. isAddressOfOperand exists because an
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/// id-expression that is the operand of address-of gets special treatment
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/// due to member pointers.
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///
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Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression,
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bool isAddressOfOperand) {
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bool NotCastExpr;
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OwningExprResult Res = ParseCastExpression(isUnaryExpression,
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isAddressOfOperand,
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NotCastExpr);
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if (NotCastExpr)
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Diag(Tok, diag::err_expected_expression);
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return move(Res);
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}
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/// ParseCastExpression - Parse a cast-expression, or, if isUnaryExpression is
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/// true, parse a unary-expression. isAddressOfOperand exists because an
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/// id-expression that is the operand of address-of gets special treatment
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/// due to member pointers. NotCastExpr is set to true if the token is not the
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/// start of a cast-expression, and no diagnostic is emitted in this case.
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///
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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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/// [GNU] '__alignof' unary-expression
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/// [GNU] '__alignof' '(' type-name ')'
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/// [C++0x] 'alignof' '(' type-id ')'
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/// [GNU] '&&' identifier
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/// [C++] new-expression
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/// [C++] delete-expression
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///
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/// unary-operator: one of
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/// '&' '*' '+' '-' '~' '!'
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/// [GNU] '__extension__' '__real' '__imag'
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///
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/// primary-expression: [C99 6.5.1]
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/// [C99] identifier
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/// [C++] id-expression
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/// constant
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/// string-literal
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/// [C++] boolean-literal [C++ 2.13.5]
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/// [C++0x] 'nullptr' [C++0x 2.14.7]
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/// '(' expression ')'
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/// '__func__' [C99 6.4.2.2]
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/// [GNU] '__FUNCTION__'
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/// [GNU] '__PRETTY_FUNCTION__'
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/// [GNU] '(' compound-statement ')'
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/// [GNU] '__builtin_va_arg' '(' assignment-expression ',' type-name ')'
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/// [GNU] '__builtin_offsetof' '(' type-name ',' offsetof-member-designator')'
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/// [GNU] '__builtin_choose_expr' '(' assign-expr ',' assign-expr ','
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/// assign-expr ')'
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/// [GNU] '__builtin_types_compatible_p' '(' type-name ',' type-name ')'
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/// [GNU] '__null'
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/// [OBJC] '[' objc-message-expr ']'
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/// [OBJC] '@selector' '(' objc-selector-arg ')'
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/// [OBJC] '@protocol' '(' identifier ')'
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/// [OBJC] '@encode' '(' type-name ')'
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/// [OBJC] objc-string-literal
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/// [C++] simple-type-specifier '(' expression-list[opt] ')' [C++ 5.2.3]
|
|
/// [C++] typename-specifier '(' expression-list[opt] ')' [TODO]
|
|
/// [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]
|
|
/// [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 [TODO]
|
|
///
|
|
/// unqualified-id: [C++ 5.1]
|
|
/// identifier
|
|
/// operator-function-id
|
|
/// conversion-function-id [TODO]
|
|
/// '~' class-name [TODO]
|
|
/// template-id [TODO]
|
|
///
|
|
/// 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] unary-type-trait:
|
|
/// '__has_nothrow_assign' [TODO]
|
|
/// '__has_nothrow_copy' [TODO]
|
|
/// '__has_nothrow_constructor' [TODO]
|
|
/// '__has_trivial_assign' [TODO]
|
|
/// '__has_trivial_copy' [TODO]
|
|
/// '__has_trivial_constructor'
|
|
/// '__has_trivial_destructor'
|
|
/// '__has_virtual_destructor' [TODO]
|
|
/// '__is_abstract' [TODO]
|
|
/// '__is_class'
|
|
/// '__is_empty' [TODO]
|
|
/// '__is_enum'
|
|
/// '__is_pod'
|
|
/// '__is_polymorphic'
|
|
/// '__is_union'
|
|
///
|
|
/// [GNU] binary-type-trait:
|
|
/// '__is_base_of' [TODO]
|
|
///
|
|
Parser::OwningExprResult Parser::ParseCastExpression(bool isUnaryExpression,
|
|
bool isAddressOfOperand,
|
|
bool &NotCastExpr) {
|
|
OwningExprResult Res(Actions);
|
|
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
|
|
// 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 ? CompoundLiteral : CastExpr;
|
|
TypeTy *CastTy;
|
|
SourceLocation LParenLoc = Tok.getLocation();
|
|
SourceLocation RParenLoc;
|
|
Res = ParseParenExpression(ParenExprType, false/*stopIfCastExr*/,
|
|
CastTy, RParenLoc);
|
|
if (Res.isInvalid()) return move(Res);
|
|
|
|
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 move(Res);
|
|
}
|
|
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
}
|
|
|
|
// primary-expression
|
|
case tok::numeric_constant:
|
|
// constant: integer-constant
|
|
// constant: floating-constant
|
|
|
|
Res = Actions.ActOnNumericConstant(Tok);
|
|
ConsumeToken();
|
|
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
|
|
case tok::kw_true:
|
|
case tok::kw_false:
|
|
return ParseCXXBoolLiteral();
|
|
|
|
case tok::kw_nullptr:
|
|
return Actions.ActOnCXXNullPtrLiteral(ConsumeToken());
|
|
|
|
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 (getLang().CPlusPlus) {
|
|
// If TryAnnotateTypeOrScopeToken annotates the token, tail recurse.
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
return ParseCastExpression(isUnaryExpression, isAddressOfOperand);
|
|
}
|
|
|
|
// Support 'Class.property' notation.
|
|
// We don't use isTokObjCMessageIdentifierReceiver(), since it allows
|
|
// 'super' (which is inappropriate here).
|
|
if (getLang().ObjC1 &&
|
|
Actions.getTypeName(*Tok.getIdentifierInfo(),
|
|
Tok.getLocation(), CurScope) &&
|
|
NextToken().is(tok::period)) {
|
|
IdentifierInfo &ReceiverName = *Tok.getIdentifierInfo();
|
|
SourceLocation IdentLoc = ConsumeToken();
|
|
SourceLocation DotLoc = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
return ExprError();
|
|
}
|
|
IdentifierInfo &PropertyName = *Tok.getIdentifierInfo();
|
|
SourceLocation PropertyLoc = ConsumeToken();
|
|
|
|
Res = Actions.ActOnClassPropertyRefExpr(ReceiverName, PropertyName,
|
|
IdentLoc, PropertyLoc);
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
}
|
|
// Consume the identifier so that we can see if it is followed by a '('.
|
|
// 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.
|
|
IdentifierInfo &II = *Tok.getIdentifierInfo();
|
|
SourceLocation L = ConsumeToken();
|
|
Res = Actions.ActOnIdentifierExpr(CurScope, L, II, Tok.is(tok::l_paren));
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
}
|
|
case tok::char_constant: // constant: character-constant
|
|
Res = Actions.ActOnCharacterConstant(Tok);
|
|
ConsumeToken();
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
case tok::kw___func__: // primary-expression: __func__ [C99 6.4.2.2]
|
|
case tok::kw___FUNCTION__: // primary-expression: __FUNCTION__ [GNU]
|
|
case tok::kw___PRETTY_FUNCTION__: // primary-expression: __P..Y_F..N__ [GNU]
|
|
Res = Actions.ActOnPredefinedExpr(Tok.getLocation(), SavedKind);
|
|
ConsumeToken();
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
case tok::string_literal: // primary-expression: string-literal
|
|
case tok::wide_string_literal:
|
|
Res = ParseStringLiteralExpression();
|
|
if (Res.isInvalid()) return move(Res);
|
|
// This can be followed by postfix-expr pieces (e.g. "foo"[1]).
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
case tok::kw___builtin_va_arg:
|
|
case tok::kw___builtin_offsetof:
|
|
case tok::kw___builtin_choose_expr:
|
|
case tok::kw___builtin_types_compatible_p:
|
|
return ParseBuiltinPrimaryExpression();
|
|
case tok::kw___null:
|
|
return Actions.ActOnGNUNullExpr(ConsumeToken());
|
|
break;
|
|
case tok::plusplus: // unary-expression: '++' unary-expression
|
|
case tok::minusminus: { // unary-expression: '--' unary-expression
|
|
SourceLocation SavedLoc = ConsumeToken();
|
|
Res = ParseCastExpression(true);
|
|
if (!Res.isInvalid())
|
|
Res = Actions.ActOnUnaryOp(CurScope, SavedLoc, SavedKind, move(Res));
|
|
return move(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(CurScope, SavedLoc, SavedKind, move(Res));
|
|
return move(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(CurScope, SavedLoc, SavedKind, move(Res));
|
|
return move(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(CurScope, SavedLoc, SavedKind, move(Res));
|
|
return move(Res);
|
|
}
|
|
case tok::kw_sizeof: // unary-expression: 'sizeof' unary-expression
|
|
// unary-expression: 'sizeof' '(' type-name ')'
|
|
case tok::kw_alignof:
|
|
case tok::kw___alignof: // unary-expression: '__alignof' unary-expression
|
|
// unary-expression: '__alignof' '(' type-name ')'
|
|
// unary-expression: 'alignof' '(' type-id ')'
|
|
return ParseSizeofAlignofExpression();
|
|
case tok::ampamp: { // unary-expression: '&&' identifier
|
|
SourceLocation AmpAmpLoc = ConsumeToken();
|
|
if (Tok.isNot(tok::identifier))
|
|
return ExprError(Diag(Tok, diag::err_expected_ident));
|
|
|
|
Diag(AmpAmpLoc, diag::ext_gnu_address_of_label);
|
|
Res = Actions.ActOnAddrLabel(AmpAmpLoc, Tok.getLocation(),
|
|
Tok.getIdentifierInfo());
|
|
ConsumeToken();
|
|
return move(Res);
|
|
}
|
|
case tok::kw_const_cast:
|
|
case tok::kw_dynamic_cast:
|
|
case tok::kw_reinterpret_cast:
|
|
case tok::kw_static_cast:
|
|
Res = ParseCXXCasts();
|
|
// These can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
case tok::kw_typeid:
|
|
Res = ParseCXXTypeid();
|
|
// This can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
case tok::kw_this:
|
|
Res = ParseCXXThis();
|
|
// This can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
|
|
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_signed:
|
|
case tok::kw_unsigned:
|
|
case tok::kw_float:
|
|
case tok::kw_double:
|
|
case tok::kw_void:
|
|
case tok::kw_typename:
|
|
case tok::kw_typeof:
|
|
case tok::annot_typename: {
|
|
if (!getLang().CPlusPlus) {
|
|
Diag(Tok, diag::err_expected_expression);
|
|
return ExprError();
|
|
}
|
|
|
|
if (SavedKind == tok::kw_typename) {
|
|
// postfix-expression: typename-specifier '(' expression-list[opt] ')'
|
|
if (!TryAnnotateTypeOrScopeToken())
|
|
return ExprError();
|
|
}
|
|
|
|
// postfix-expression: simple-type-specifier '(' expression-list[opt] ')'
|
|
//
|
|
DeclSpec DS;
|
|
ParseCXXSimpleTypeSpecifier(DS);
|
|
if (Tok.isNot(tok::l_paren))
|
|
return ExprError(Diag(Tok, diag::err_expected_lparen_after_type)
|
|
<< DS.getSourceRange());
|
|
|
|
Res = ParseCXXTypeConstructExpression(DS);
|
|
// This can be followed by postfix-expr pieces.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
}
|
|
|
|
case tok::annot_cxxscope: // [C++] id-expression: qualified-id
|
|
case tok::kw_operator: // [C++] id-expression: operator/conversion-function-id
|
|
case tok::annot_template_id: // [C++] template-id
|
|
Res = ParseCXXIdExpression(isAddressOfOperand);
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
|
|
case tok::coloncolon: {
|
|
// ::foo::bar -> global qualified name etc. If TryAnnotateTypeOrScopeToken
|
|
// annotates the token, tail recurse.
|
|
if (TryAnnotateTypeOrScopeToken())
|
|
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___is_pod: // [GNU] unary-type-trait
|
|
case tok::kw___is_class:
|
|
case tok::kw___is_enum:
|
|
case tok::kw___is_union:
|
|
case tok::kw___is_polymorphic:
|
|
case tok::kw___is_abstract:
|
|
case tok::kw___has_trivial_constructor:
|
|
case tok::kw___has_trivial_destructor:
|
|
return ParseUnaryTypeTrait();
|
|
|
|
case tok::at: {
|
|
SourceLocation AtLoc = ConsumeToken();
|
|
return ParseObjCAtExpression(AtLoc);
|
|
}
|
|
case tok::caret:
|
|
return ParsePostfixExpressionSuffix(ParseBlockLiteralExpression());
|
|
case tok::l_square:
|
|
// These can be followed by postfix-expr pieces.
|
|
if (getLang().ObjC1)
|
|
return ParsePostfixExpressionSuffix(ParseObjCMessageExpression());
|
|
// FALL THROUGH.
|
|
default:
|
|
NotCastExpr = true;
|
|
return ExprError();
|
|
}
|
|
|
|
// unreachable.
|
|
abort();
|
|
}
|
|
|
|
/// ParsePostfixExpressionSuffix - Once the leading part of a postfix-expression
|
|
/// is parsed, this method parses any suffixes that apply.
|
|
///
|
|
/// postfix-expression: [C99 6.5.2]
|
|
/// primary-expression
|
|
/// postfix-expression '[' expression ']'
|
|
/// 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
|
|
/// argument-expression-list ',' assignment-expression
|
|
///
|
|
Parser::OwningExprResult
|
|
Parser::ParsePostfixExpressionSuffix(OwningExprResult 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()) {
|
|
default: // Not a postfix-expression suffix.
|
|
return move(LHS);
|
|
case tok::l_square: { // postfix-expression: p-e '[' expression ']'
|
|
Loc = ConsumeBracket();
|
|
OwningExprResult Idx(ParseExpression());
|
|
|
|
SourceLocation RLoc = Tok.getLocation();
|
|
|
|
if (!LHS.isInvalid() && !Idx.isInvalid() && Tok.is(tok::r_square)) {
|
|
LHS = Actions.ActOnArraySubscriptExpr(CurScope, move(LHS), Loc,
|
|
move(Idx), RLoc);
|
|
} else
|
|
LHS = ExprError();
|
|
|
|
// Match the ']'.
|
|
MatchRHSPunctuation(tok::r_square, Loc);
|
|
break;
|
|
}
|
|
|
|
case tok::l_paren: { // p-e: p-e '(' argument-expression-list[opt] ')'
|
|
ExprVector ArgExprs(Actions);
|
|
CommaLocsTy CommaLocs;
|
|
|
|
Loc = ConsumeParen();
|
|
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
if (ParseExpressionList(ArgExprs, CommaLocs)) {
|
|
SkipUntil(tok::r_paren);
|
|
return ExprError();
|
|
}
|
|
}
|
|
|
|
// Match the ')'.
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
MatchRHSPunctuation(tok::r_paren, Loc);
|
|
return ExprError();
|
|
}
|
|
|
|
if (!LHS.isInvalid()) {
|
|
assert((ArgExprs.size() == 0 || ArgExprs.size()-1 == CommaLocs.size())&&
|
|
"Unexpected number of commas!");
|
|
LHS = Actions.ActOnCallExpr(CurScope, move(LHS), Loc,
|
|
move_arg(ArgExprs), CommaLocs.data(),
|
|
Tok.getLocation());
|
|
}
|
|
|
|
ConsumeParen();
|
|
break;
|
|
}
|
|
case tok::arrow: // postfix-expression: p-e '->' identifier
|
|
case tok::period: { // postfix-expression: p-e '.' identifier
|
|
tok::TokenKind OpKind = Tok.getKind();
|
|
SourceLocation OpLoc = ConsumeToken(); // Eat the "." or "->" token.
|
|
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
return ExprError();
|
|
}
|
|
|
|
if (!LHS.isInvalid()) {
|
|
LHS = Actions.ActOnMemberReferenceExpr(CurScope, move(LHS), OpLoc,
|
|
OpKind, Tok.getLocation(),
|
|
*Tok.getIdentifierInfo(),
|
|
ObjCImpDecl);
|
|
}
|
|
ConsumeToken();
|
|
break;
|
|
}
|
|
case tok::plusplus: // postfix-expression: postfix-expression '++'
|
|
case tok::minusminus: // postfix-expression: postfix-expression '--'
|
|
if (!LHS.isInvalid()) {
|
|
LHS = Actions.ActOnPostfixUnaryOp(CurScope, Tok.getLocation(),
|
|
Tok.getKind(), move(LHS));
|
|
}
|
|
ConsumeToken();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// ParseExprAfterTypeofSizeofAlignof - We parsed a typeof/sizeof/alignof 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).
|
|
///
|
|
/// unary-expression: [C99 6.5.3]
|
|
/// 'sizeof' unary-expression
|
|
/// 'sizeof' '(' type-name ')'
|
|
/// [GNU] '__alignof' unary-expression
|
|
/// [GNU] '__alignof' '(' type-name ')'
|
|
/// [C++0x] 'alignof' '(' type-id ')'
|
|
///
|
|
/// [GNU] typeof-specifier:
|
|
/// typeof ( expressions )
|
|
/// typeof ( type-name )
|
|
/// [GNU/C++] typeof unary-expression
|
|
///
|
|
Parser::OwningExprResult
|
|
Parser::ParseExprAfterTypeofSizeofAlignof(const Token &OpTok,
|
|
bool &isCastExpr,
|
|
TypeTy *&CastTy,
|
|
SourceRange &CastRange) {
|
|
|
|
assert((OpTok.is(tok::kw_typeof) || OpTok.is(tok::kw_sizeof) ||
|
|
OpTok.is(tok::kw___alignof) || OpTok.is(tok::kw_alignof)) &&
|
|
"Not a typeof/sizeof/alignof expression!");
|
|
|
|
OwningExprResult Operand(Actions);
|
|
|
|
// If the operand doesn't start with an '(', it must be an expression.
|
|
if (Tok.isNot(tok::l_paren)) {
|
|
isCastExpr = false;
|
|
if (OpTok.is(tok::kw_typeof) && !getLang().CPlusPlus) {
|
|
Diag(Tok,diag::err_expected_lparen_after_id) << OpTok.getIdentifierInfo();
|
|
return ExprError();
|
|
}
|
|
|
|
// C++0x [expr.sizeof]p1:
|
|
// [...] The operand is either an expression, which is an unevaluated
|
|
// operand (Clause 5) [...]
|
|
//
|
|
// The GNU typeof and alignof extensions also behave as unevaluated
|
|
// operands.
|
|
EnterExpressionEvaluationContext Unevaluated(Actions,
|
|
Action::Unevaluated);
|
|
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;
|
|
|
|
// C++0x [expr.sizeof]p1:
|
|
// [...] The operand is either an expression, which is an unevaluated
|
|
// operand (Clause 5) [...]
|
|
//
|
|
// The GNU typeof and alignof extensions also behave as unevaluated
|
|
// operands.
|
|
EnterExpressionEvaluationContext Unevaluated(Actions,
|
|
Action::Unevaluated);
|
|
Operand = ParseParenExpression(ExprType, true/*stopIfCastExpr*/,
|
|
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 this is a parenthesized expression, it is the start of a
|
|
// unary-expression, but doesn't include any postfix pieces. Parse these
|
|
// now if present.
|
|
Operand = ParsePostfixExpressionSuffix(move(Operand));
|
|
}
|
|
|
|
// If we get here, the operand to the typeof/sizeof/alignof was an expresion.
|
|
isCastExpr = false;
|
|
return move(Operand);
|
|
}
|
|
|
|
|
|
/// ParseSizeofAlignofExpression - Parse a sizeof or alignof expression.
|
|
/// unary-expression: [C99 6.5.3]
|
|
/// 'sizeof' unary-expression
|
|
/// 'sizeof' '(' type-name ')'
|
|
/// [GNU] '__alignof' unary-expression
|
|
/// [GNU] '__alignof' '(' type-name ')'
|
|
/// [C++0x] 'alignof' '(' type-id ')'
|
|
Parser::OwningExprResult Parser::ParseSizeofAlignofExpression() {
|
|
assert((Tok.is(tok::kw_sizeof) || Tok.is(tok::kw___alignof)
|
|
|| Tok.is(tok::kw_alignof)) &&
|
|
"Not a sizeof/alignof expression!");
|
|
Token OpTok = Tok;
|
|
ConsumeToken();
|
|
|
|
bool isCastExpr;
|
|
TypeTy *CastTy;
|
|
SourceRange CastRange;
|
|
OwningExprResult Operand = ParseExprAfterTypeofSizeofAlignof(OpTok,
|
|
isCastExpr,
|
|
CastTy,
|
|
CastRange);
|
|
|
|
if (isCastExpr)
|
|
return Actions.ActOnSizeOfAlignOfExpr(OpTok.getLocation(),
|
|
OpTok.is(tok::kw_sizeof),
|
|
/*isType=*/true, CastTy,
|
|
CastRange);
|
|
|
|
// If we get here, the operand to the sizeof/alignof was an expresion.
|
|
if (!Operand.isInvalid())
|
|
Operand = Actions.ActOnSizeOfAlignOfExpr(OpTok.getLocation(),
|
|
OpTok.is(tok::kw_sizeof),
|
|
/*isType=*/false,
|
|
Operand.release(), CastRange);
|
|
return move(Operand);
|
|
}
|
|
|
|
/// ParseBuiltinPrimaryExpression
|
|
///
|
|
/// 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 ')'
|
|
///
|
|
/// [GNU] offsetof-member-designator:
|
|
/// [GNU] identifier
|
|
/// [GNU] offsetof-member-designator '.' identifier
|
|
/// [GNU] offsetof-member-designator '[' expression ']'
|
|
///
|
|
Parser::OwningExprResult Parser::ParseBuiltinPrimaryExpression() {
|
|
OwningExprResult Res(Actions);
|
|
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);
|
|
|
|
SourceLocation LParenLoc = ConsumeParen();
|
|
// TODO: Build AST.
|
|
|
|
switch (T) {
|
|
default: assert(0 && "Not a builtin primary expression!");
|
|
case tok::kw___builtin_va_arg: {
|
|
OwningExprResult Expr(ParseAssignmentExpression());
|
|
if (Expr.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return ExprError();
|
|
}
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
TypeResult Ty = ParseTypeName();
|
|
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
return ExprError();
|
|
}
|
|
if (Ty.isInvalid())
|
|
Res = ExprError();
|
|
else
|
|
Res = Actions.ActOnVAArg(StartLoc, move(Expr), Ty.get(), ConsumeParen());
|
|
break;
|
|
}
|
|
case tok::kw___builtin_offsetof: {
|
|
SourceLocation TypeLoc = Tok.getLocation();
|
|
TypeResult Ty = ParseTypeName();
|
|
if (Ty.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
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);
|
|
return ExprError();
|
|
}
|
|
|
|
// Keep track of the various subcomponents we see.
|
|
llvm::SmallVector<Action::OffsetOfComponent, 4> Comps;
|
|
|
|
Comps.push_back(Action::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(Action::OffsetOfComponent());
|
|
Comps.back().isBrackets = false;
|
|
Comps.back().LocStart = ConsumeToken();
|
|
|
|
if (Tok.isNot(tok::identifier)) {
|
|
Diag(Tok, diag::err_expected_ident);
|
|
SkipUntil(tok::r_paren);
|
|
return ExprError();
|
|
}
|
|
Comps.back().U.IdentInfo = Tok.getIdentifierInfo();
|
|
Comps.back().LocEnd = ConsumeToken();
|
|
|
|
} else if (Tok.is(tok::l_square)) {
|
|
// offsetof-member-designator: offsetof-member-design '[' expression ']'
|
|
Comps.push_back(Action::OffsetOfComponent());
|
|
Comps.back().isBrackets = true;
|
|
Comps.back().LocStart = ConsumeBracket();
|
|
Res = ParseExpression();
|
|
if (Res.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return move(Res);
|
|
}
|
|
Comps.back().U.E = Res.release();
|
|
|
|
Comps.back().LocEnd =
|
|
MatchRHSPunctuation(tok::r_square, Comps.back().LocStart);
|
|
} else {
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
MatchRHSPunctuation(tok::r_paren, LParenLoc);
|
|
Res = ExprError();
|
|
} else if (Ty.isInvalid()) {
|
|
Res = ExprError();
|
|
} else {
|
|
Res = Actions.ActOnBuiltinOffsetOf(CurScope, StartLoc, TypeLoc,
|
|
Ty.get(), &Comps[0],
|
|
Comps.size(), ConsumeParen());
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case tok::kw___builtin_choose_expr: {
|
|
OwningExprResult Cond(ParseAssignmentExpression());
|
|
if (Cond.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return move(Cond);
|
|
}
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
OwningExprResult Expr1(ParseAssignmentExpression());
|
|
if (Expr1.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return move(Expr1);
|
|
}
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
OwningExprResult Expr2(ParseAssignmentExpression());
|
|
if (Expr2.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return move(Expr2);
|
|
}
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
return ExprError();
|
|
}
|
|
Res = Actions.ActOnChooseExpr(StartLoc, move(Cond), move(Expr1),
|
|
move(Expr2), ConsumeParen());
|
|
break;
|
|
}
|
|
case tok::kw___builtin_types_compatible_p:
|
|
TypeResult Ty1 = ParseTypeName();
|
|
|
|
if (ExpectAndConsume(tok::comma, diag::err_expected_comma, "",tok::r_paren))
|
|
return ExprError();
|
|
|
|
TypeResult Ty2 = ParseTypeName();
|
|
|
|
if (Tok.isNot(tok::r_paren)) {
|
|
Diag(Tok, diag::err_expected_rparen);
|
|
return ExprError();
|
|
}
|
|
|
|
if (Ty1.isInvalid() || Ty2.isInvalid())
|
|
Res = ExprError();
|
|
else
|
|
Res = Actions.ActOnTypesCompatibleExpr(StartLoc, Ty1.get(), Ty2.get(),
|
|
ConsumeParen());
|
|
break;
|
|
}
|
|
|
|
// These can be followed by postfix-expr pieces because they are
|
|
// primary-expressions.
|
|
return ParsePostfixExpressionSuffix(move(Res));
|
|
}
|
|
|
|
/// 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.
|
|
///
|
|
/// 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
|
|
///
|
|
Parser::OwningExprResult
|
|
Parser::ParseParenExpression(ParenParseOption &ExprType, bool stopIfCastExpr,
|
|
TypeTy *&CastTy, SourceLocation &RParenLoc) {
|
|
assert(Tok.is(tok::l_paren) && "Not a paren expr!");
|
|
GreaterThanIsOperatorScope G(GreaterThanIsOperator, true);
|
|
SourceLocation OpenLoc = ConsumeParen();
|
|
OwningExprResult Result(Actions, true);
|
|
bool isAmbiguousTypeId;
|
|
CastTy = 0;
|
|
|
|
if (ExprType >= CompoundStmt && Tok.is(tok::l_brace)) {
|
|
Diag(Tok, diag::ext_gnu_statement_expr);
|
|
OwningStmtResult Stmt(ParseCompoundStatement(true));
|
|
ExprType = CompoundStmt;
|
|
|
|
// If the substmt parsed correctly, build the AST node.
|
|
if (!Stmt.isInvalid() && Tok.is(tok::r_paren))
|
|
Result = Actions.ActOnStmtExpr(OpenLoc, move(Stmt), Tok.getLocation());
|
|
|
|
} 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)
|
|
return ParseCXXAmbiguousParenExpression(ExprType, CastTy,
|
|
OpenLoc, RParenLoc);
|
|
|
|
TypeResult Ty = ParseTypeName();
|
|
|
|
// Match the ')'.
|
|
if (Tok.is(tok::r_paren))
|
|
RParenLoc = ConsumeParen();
|
|
else
|
|
MatchRHSPunctuation(tok::r_paren, OpenLoc);
|
|
|
|
if (Tok.is(tok::l_brace)) {
|
|
ExprType = CompoundLiteral;
|
|
return ParseCompoundLiteralExpression(Ty.get(), OpenLoc, RParenLoc);
|
|
}
|
|
|
|
if (ExprType == CastExpr) {
|
|
// We parsed '(' type-name ')' and the thing after it wasn't a '{'.
|
|
|
|
if (Ty.isInvalid())
|
|
return ExprError();
|
|
|
|
CastTy = Ty.get();
|
|
|
|
if (stopIfCastExpr) {
|
|
// Note that this doesn't parse the subsequent cast-expression, it just
|
|
// returns the parsed type to the callee.
|
|
return OwningExprResult(Actions);
|
|
}
|
|
|
|
// Parse the cast-expression that follows it next.
|
|
// TODO: For cast expression with CastTy.
|
|
Result = ParseCastExpression(false);
|
|
if (!Result.isInvalid())
|
|
Result = Actions.ActOnCastExpr(OpenLoc, CastTy, RParenLoc,move(Result));
|
|
return move(Result);
|
|
}
|
|
|
|
Diag(Tok, diag::err_expected_lbrace_in_compound_literal);
|
|
return ExprError();
|
|
} else {
|
|
Result = ParseExpression();
|
|
ExprType = SimpleExpr;
|
|
if (!Result.isInvalid() && Tok.is(tok::r_paren))
|
|
Result = Actions.ActOnParenExpr(OpenLoc, Tok.getLocation(), move(Result));
|
|
}
|
|
|
|
// Match the ')'.
|
|
if (Result.isInvalid()) {
|
|
SkipUntil(tok::r_paren);
|
|
return ExprError();
|
|
}
|
|
|
|
if (Tok.is(tok::r_paren))
|
|
RParenLoc = ConsumeParen();
|
|
else
|
|
MatchRHSPunctuation(tok::r_paren, OpenLoc);
|
|
|
|
return move(Result);
|
|
}
|
|
|
|
/// ParseCompoundLiteralExpression - We have parsed the parenthesized type-name
|
|
/// and we are at the left brace.
|
|
///
|
|
/// postfix-expression: [C99 6.5.2]
|
|
/// '(' type-name ')' '{' initializer-list '}'
|
|
/// '(' type-name ')' '{' initializer-list ',' '}'
|
|
///
|
|
Parser::OwningExprResult
|
|
Parser::ParseCompoundLiteralExpression(TypeTy *Ty,
|
|
SourceLocation LParenLoc,
|
|
SourceLocation RParenLoc) {
|
|
assert(Tok.is(tok::l_brace) && "Not a compound literal!");
|
|
if (!getLang().C99) // Compound literals don't exist in C90.
|
|
Diag(LParenLoc, diag::ext_c99_compound_literal);
|
|
OwningExprResult Result = ParseInitializer();
|
|
if (!Result.isInvalid() && Ty)
|
|
return Actions.ActOnCompoundLiteral(LParenLoc, Ty, RParenLoc, move(Result));
|
|
return move(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].
|
|
///
|
|
/// primary-expression: [C99 6.5.1]
|
|
/// string-literal
|
|
Parser::OwningExprResult Parser::ParseStringLiteralExpression() {
|
|
assert(isTokenStringLiteral() && "Not a string literal!");
|
|
|
|
// String concat. Note that keywords like __func__ and __FUNCTION__ are not
|
|
// considered to be strings for concatenation purposes.
|
|
llvm::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());
|
|
}
|
|
|
|
/// ParseExpressionList - Used for C/C++ (argument-)expression-list.
|
|
///
|
|
/// argument-expression-list:
|
|
/// assignment-expression
|
|
/// argument-expression-list , assignment-expression
|
|
///
|
|
/// [C++] expression-list:
|
|
/// [C++] assignment-expression
|
|
/// [C++] expression-list , assignment-expression
|
|
///
|
|
bool Parser::ParseExpressionList(ExprListTy &Exprs, CommaLocsTy &CommaLocs) {
|
|
while (1) {
|
|
OwningExprResult Expr(ParseAssignmentExpression());
|
|
if (Expr.isInvalid())
|
|
return true;
|
|
|
|
Exprs.push_back(Expr.release());
|
|
|
|
if (Tok.isNot(tok::comma))
|
|
return false;
|
|
// Move to the next argument, remember where the comma was.
|
|
CommaLocs.push_back(ConsumeToken());
|
|
}
|
|
}
|
|
|
|
/// ParseBlockId - Parse a block-id, which roughly looks like int (int x).
|
|
///
|
|
/// [clang] block-id:
|
|
/// [clang] specifier-qualifier-list block-declarator
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///
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void Parser::ParseBlockId() {
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// Parse the specifier-qualifier-list piece.
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DeclSpec DS;
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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.AddAttributes(DS.TakeAttributes(),
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SourceLocation());
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if (Tok.is(tok::kw___attribute)) {
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SourceLocation Loc;
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AttributeList *AttrList = ParseAttributes(&Loc);
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DeclaratorInfo.AddAttributes(AttrList, Loc);
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}
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(DeclaratorInfo, CurScope);
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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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/// 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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///
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Parser::OwningExprResult 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::BreakScope | Scope::ContinueScope |
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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, CurScope);
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// Parse the return type if present.
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DeclSpec DS;
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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, CurScope);
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return ExprError();
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}
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if (Tok.is(tok::kw___attribute)) {
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SourceLocation Loc;
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AttributeList *AttrList = ParseAttributes(&Loc);
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ParamInfo.AddAttributes(AttrList, Loc);
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}
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(ParamInfo, CurScope);
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} else if (!Tok.is(tok::l_brace)) {
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ParseBlockId();
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} else {
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// Otherwise, pretend we saw (void).
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ParamInfo.AddTypeInfo(DeclaratorChunk::getFunction(true, false,
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SourceLocation(),
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0, 0, 0,
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false, SourceLocation(),
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false, 0, 0, 0,
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CaretLoc, ParamInfo),
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CaretLoc);
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if (Tok.is(tok::kw___attribute)) {
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SourceLocation Loc;
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AttributeList *AttrList = ParseAttributes(&Loc);
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ParamInfo.AddAttributes(AttrList, Loc);
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}
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// Inform sema that we are starting a block.
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Actions.ActOnBlockArguments(ParamInfo, CurScope);
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}
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OwningExprResult Result(Actions, 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, CurScope);
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return ExprError();
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}
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OwningStmtResult Stmt(ParseCompoundStatementBody());
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if (!Stmt.isInvalid())
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Result = Actions.ActOnBlockStmtExpr(CaretLoc, move(Stmt), CurScope);
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else
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Actions.ActOnBlockError(CaretLoc, CurScope);
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return move(Result);
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}
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