GenericValue.h revision 321369 
1//===- GenericValue.h - Represent any type of LLVM value --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// The GenericValue class is used to represent an LLVM value of arbitrary type.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_EXECUTIONENGINE_GENERICVALUE_H
15#define LLVM_EXECUTIONENGINE_GENERICVALUE_H
16
17#include "llvm/ADT/APInt.h"
18#include <vector>
19
20namespace llvm {
21
22using PointerTy = void *;
23
24struct GenericValue {
25  struct IntPair {
26    unsigned int first;
27    unsigned int second;
28  };
29  union {
30    double DoubleVal;
31    float FloatVal;
32    PointerTy PointerVal;
33    struct IntPair UIntPairVal;
34    unsigned char Untyped[8];
35  };
36  APInt IntVal; // also used for long doubles.
37  // For aggregate data types.
38  std::vector<GenericValue> AggregateVal;
39
40  // to make code faster, set GenericValue to zero could be omitted, but it is
41  // potentially can cause problems, since GenericValue to store garbage
42  // instead of zero.
43  GenericValue() : IntVal(1, 0) {
44    UIntPairVal.first = 0;
45    UIntPairVal.second = 0;
46  }
47  explicit GenericValue(void *V) : PointerVal(V), IntVal(1, 0) {}
48};
49
50inline GenericValue PTOGV(void *P) { return GenericValue(P); }
51inline void *GVTOP(const GenericValue &GV) { return GV.PointerVal; }
52
53} // end namespace llvm
54
55#endif // LLVM_EXECUTIONENGINE_GENERICVALUE_H
56