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annotate lib/CodeGen/PseudoSourceValue.cpp @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the PseudoSourceValue class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/CodeGen/PseudoSourceValue.h"
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15 #include "llvm/CodeGen/MachineFrameInfo.h"
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16 #include "llvm/IR/DerivedTypes.h"
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17 #include "llvm/IR/LLVMContext.h"
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18 #include "llvm/Support/ErrorHandling.h"
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19 #include "llvm/Support/ManagedStatic.h"
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20 #include "llvm/Support/Mutex.h"
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21 #include "llvm/Support/raw_ostream.h"
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22 #include <map>
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23 using namespace llvm;
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24
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25 namespace {
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26 struct PSVGlobalsTy {
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27 // PseudoSourceValues are immutable so don't need locking.
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28 const PseudoSourceValue PSVs[4];
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29 sys::Mutex Lock; // Guards FSValues, but not the values inside it.
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30 std::map<int, const PseudoSourceValue *> FSValues;
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31
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32 PSVGlobalsTy() : PSVs() {}
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33 ~PSVGlobalsTy() {
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34 for (std::map<int, const PseudoSourceValue *>::iterator
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35 I = FSValues.begin(), E = FSValues.end(); I != E; ++I) {
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36 delete I->second;
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37 }
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38 }
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39 };
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40
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41 static ManagedStatic<PSVGlobalsTy> PSVGlobals;
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42
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43 } // anonymous namespace
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44
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45 const PseudoSourceValue *PseudoSourceValue::getStack()
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46 { return &PSVGlobals->PSVs[0]; }
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47 const PseudoSourceValue *PseudoSourceValue::getGOT()
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48 { return &PSVGlobals->PSVs[1]; }
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49 const PseudoSourceValue *PseudoSourceValue::getJumpTable()
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50 { return &PSVGlobals->PSVs[2]; }
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51 const PseudoSourceValue *PseudoSourceValue::getConstantPool()
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52 { return &PSVGlobals->PSVs[3]; }
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53
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54 static const char *const PSVNames[] = {
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55 "Stack",
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56 "GOT",
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57 "JumpTable",
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58 "ConstantPool"
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59 };
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60
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61 // FIXME: THIS IS A HACK!!!!
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62 // Eventually these should be uniqued on LLVMContext rather than in a managed
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63 // static. For now, we can safely use the global context for the time being to
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64 // squeak by.
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65 PseudoSourceValue::PseudoSourceValue(enum ValueTy Subclass) :
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66 Value(Type::getInt8PtrTy(getGlobalContext()),
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67 Subclass) {}
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68
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69 void PseudoSourceValue::printCustom(raw_ostream &O) const {
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70 O << PSVNames[this - PSVGlobals->PSVs];
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71 }
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72
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73 const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
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74 PSVGlobalsTy &PG = *PSVGlobals;
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75 sys::ScopedLock locked(PG.Lock);
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76 const PseudoSourceValue *&V = PG.FSValues[FI];
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77 if (!V)
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78 V = new FixedStackPseudoSourceValue(FI);
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79 return V;
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80 }
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81
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82 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
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83 if (this == getStack())
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84 return false;
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85 if (this == getGOT() ||
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86 this == getConstantPool() ||
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87 this == getJumpTable())
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88 return true;
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89 llvm_unreachable("Unknown PseudoSourceValue!");
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90 }
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91
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92 bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
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93 if (this == getStack() ||
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94 this == getGOT() ||
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95 this == getConstantPool() ||
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96 this == getJumpTable())
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97 return false;
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98 llvm_unreachable("Unknown PseudoSourceValue!");
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99 }
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100
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101 bool PseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
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102 if (this == getGOT() ||
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103 this == getConstantPool() ||
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104 this == getJumpTable())
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105 return false;
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106 return true;
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107 }
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108
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109 bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
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110 return MFI && MFI->isImmutableObjectIndex(FI);
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111 }
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112
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113 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
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114 // Negative frame indices are used for special things that don't
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115 // appear in LLVM IR. Non-negative indices may be used for things
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116 // like static allocas.
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117 if (!MFI)
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118 return FI >= 0;
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119 // Spill slots should not alias others.
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120 return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);
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121 }
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122
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123 bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
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124 if (!MFI)
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125 return true;
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126 // Spill slots will not alias any LLVM IR value.
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127 return !MFI->isSpillSlotObjectIndex(FI);
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128 }
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129
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130 void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 OS << "FixedStack" << FI;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 }