PseudoSourceValue.cpp revision 7afc3b7f03c1c226ad4d924b36a6d232999546e4 
1//===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- 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// This file implements the PseudoSourceValue class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/CodeGen/MachineFrameInfo.h"
15#include "llvm/CodeGen/PseudoSourceValue.h"
16#include "llvm/DerivedTypes.h"
17#include "llvm/Support/Compiler.h"
18#include "llvm/Support/ManagedStatic.h"
19#include "llvm/Support/raw_ostream.h"
20#include <map>
21using namespace llvm;
22
23static ManagedStatic<PseudoSourceValue[4]> PSVs;
24
25const PseudoSourceValue *PseudoSourceValue::getStack()
26{ return &(*PSVs)[0]; }
27const PseudoSourceValue *PseudoSourceValue::getGOT()
28{ return &(*PSVs)[1]; }
29const PseudoSourceValue *PseudoSourceValue::getJumpTable()
30{ return &(*PSVs)[2]; }
31const PseudoSourceValue *PseudoSourceValue::getConstantPool()
32{ return &(*PSVs)[3]; }
33
34static const char *const PSVNames[] = {
35  "Stack",
36  "GOT",
37  "JumpTable",
38  "ConstantPool"
39};
40
41PseudoSourceValue::PseudoSourceValue() :
42  Value(PointerType::getUnqual(Type::Int8Ty), PseudoSourceValueVal) {}
43
44void PseudoSourceValue::print(raw_ostream &OS) const {
45  OS << PSVNames[this - *PSVs];
46}
47
48namespace {
49  /// FixedStackPseudoSourceValue - A specialized PseudoSourceValue
50  /// for holding FixedStack values, which must include a frame
51  /// index.
52  class VISIBILITY_HIDDEN FixedStackPseudoSourceValue
53    : public PseudoSourceValue {
54    const int FI;
55  public:
56    explicit FixedStackPseudoSourceValue(int fi) : FI(fi) {}
57
58    virtual bool isConstant(const MachineFrameInfo *MFI) const;
59
60    virtual void print(raw_ostream &OS) const {
61      OS << "FixedStack" << FI;
62    }
63  };
64}
65
66static ManagedStatic<std::map<int, const PseudoSourceValue *> > FSValues;
67
68const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
69  const PseudoSourceValue *&V = (*FSValues)[FI];
70  if (!V)
71    V = new FixedStackPseudoSourceValue(FI);
72  return V;
73}
74
75bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
76  if (this == getStack())
77    return false;
78  if (this == getGOT() ||
79      this == getConstantPool() ||
80      this == getJumpTable())
81    return true;
82  assert(0 && "Unknown PseudoSourceValue!");
83  return false;
84}
85
86bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
87  return MFI && MFI->isImmutableObjectIndex(FI);
88}
89