llvm-mirror/include/llvm/ExecutionEngine/GenericValue.h

//===-- GenericValue.h - Represent any type of LLVM value -------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The GenericValue class is used to represent an LLVM value of arbitrary type.
//
//===----------------------------------------------------------------------===//


#ifndef LLVM_EXECUTIONENGINE_GENERICVALUE_H
#define LLVM_EXECUTIONENGINE_GENERICVALUE_H

#include "llvm/ADT/APInt.h"
#include "llvm/Support/DataTypes.h"
#include <vector>

namespace llvm {

typedef void* PointerTy;
class APInt;

struct GenericValue {
  struct IntPair {
    unsigned int first;
    unsigned int second;
  };
  union {
    double          DoubleVal;
    float           FloatVal;
    PointerTy       PointerVal;
    struct IntPair  UIntPairVal;
    unsigned char   Untyped[8];
  };
  APInt IntVal;   // also used for long doubles.
  // For aggregate data types.
  std::vector<GenericValue> AggregateVal;

  // to make code faster, set GenericValue to zero could be omitted, but it is
  // potentially can cause problems, since GenericValue to store garbage
  // instead of zero.
  GenericValue() : IntVal(1,0) {UIntPairVal.first = 0; UIntPairVal.second = 0;}
  explicit GenericValue(void *V) : PointerVal(V), IntVal(1,0) { }
};

inline GenericValue PTOGV(void *P) { return GenericValue(P); }
inline void* GVTOP(const GenericValue &GV) { return GV.PointerVal; }

} // End llvm namespace.
#endif