1 //===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the PseudoSourceValue class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/MachineFrameInfo.h"
15 #include "llvm/CodeGen/PseudoSourceValue.h"
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/LLVMContext.h"
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Support/ManagedStatic.h"
20 #include "llvm/Support/raw_ostream.h"
24 static ManagedStatic<PseudoSourceValue[4]> PSVs;
26 const PseudoSourceValue *PseudoSourceValue::getStack()
27 { return &(*PSVs)[0]; }
28 const PseudoSourceValue *PseudoSourceValue::getGOT()
29 { return &(*PSVs)[1]; }
30 const PseudoSourceValue *PseudoSourceValue::getJumpTable()
31 { return &(*PSVs)[2]; }
32 const PseudoSourceValue *PseudoSourceValue::getConstantPool()
33 { return &(*PSVs)[3]; }
35 static const char *const PSVNames[] = {
42 // FIXME: THIS IS A HACK!!!!
43 // Eventually these should be uniqued on LLVMContext rather than in a managed
44 // static. For now, we can safely use the global context for the time being to
46 PseudoSourceValue::PseudoSourceValue() :
47 Value(Type::getInt8PtrTy(getGlobalContext()),
48 PseudoSourceValueVal) {}
50 void PseudoSourceValue::printCustom(raw_ostream &O) const {
51 O << PSVNames[this - *PSVs];
55 /// FixedStackPseudoSourceValue - A specialized PseudoSourceValue
56 /// for holding FixedStack values, which must include a frame
58 class FixedStackPseudoSourceValue : public PseudoSourceValue {
61 explicit FixedStackPseudoSourceValue(int fi) : FI(fi) {}
63 virtual bool isConstant(const MachineFrameInfo *MFI) const;
65 virtual bool isAliased(const MachineFrameInfo *MFI) const;
67 virtual void printCustom(raw_ostream &OS) const {
68 OS << "FixedStack" << FI;
73 static ManagedStatic<std::map<int, const PseudoSourceValue *> > FSValues;
75 const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
76 const PseudoSourceValue *&V = (*FSValues)[FI];
78 V = new FixedStackPseudoSourceValue(FI);
82 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
83 if (this == getStack())
85 if (this == getGOT() ||
86 this == getConstantPool() ||
87 this == getJumpTable())
89 llvm_unreachable("Unknown PseudoSourceValue!");
93 bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
94 if (this == getStack() ||
96 this == getConstantPool() ||
97 this == getJumpTable())
99 llvm_unreachable("Unknown PseudoSourceValue!");
103 bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
104 return MFI && MFI->isImmutableObjectIndex(FI);
107 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
108 // Negative frame indices are used for special things that don't
109 // appear in LLVM IR. Non-negative indices may be used for things
110 // like static allocas.
113 // Spill slots should not alias others.
114 return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);