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//===--- FullExpr.h - C++ full expression class -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the FullExpr interface, to be used for type safe handling
// of full expressions.
//
// Full expressions are described in C++ [intro.execution]p12.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_AST_FULLEXPR_H
#define LLVM_CLANG_AST_FULLEXPR_H
#include "llvm/ADT/PointerUnion.h"
namespace clang {
class ASTContext;
class CXXTemporary;
class Expr;
class FullExpr {
struct ExprAndTemporaries {
Expr *SubExpr;
unsigned NumTemps;
typedef CXXTemporary** temps_iterator;
temps_iterator temps_begin() {
return reinterpret_cast<CXXTemporary **>(this + 1);
}
temps_iterator temps_end() {
return temps_begin() + NumTemps;
}
};
typedef llvm::PointerUnion<Expr *, ExprAndTemporaries *> SubExprTy;
SubExprTy SubExpr;
FullExpr() { }
public:
static FullExpr Create(ASTContext &Context, Expr *SubExpr,
CXXTemporary **Temps, unsigned NumTemps);
Expr *getExpr() {
if (Expr *E = SubExpr.dyn_cast<Expr *>())
return E;
return SubExpr.get<ExprAndTemporaries *>()->SubExpr;
}
const Expr *getExpr() const {
return const_cast<FullExpr*>(this)->getExpr();
}
typedef CXXTemporary** temps_iterator;
temps_iterator temps_begin() {
if (ExprAndTemporaries *ET = SubExpr.dyn_cast<ExprAndTemporaries *>())
return ET->temps_begin();
return 0;
}
temps_iterator temps_end() {
if (ExprAndTemporaries *ET = SubExpr.dyn_cast<ExprAndTemporaries *>())
return ET->temps_end();
return 0;
}
void *getAsOpaquePtr() const { return SubExpr.getOpaqueValue(); }
static FullExpr getFromOpaquePtr(void *Ptr) {
FullExpr E;
E.SubExpr = SubExprTy::getFromOpaqueValue(Ptr);
return E;
}
};
} // end namespace clang
#endif
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