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/Support/ErrorHandling.h"
18 #include "llvm/Support/ManagedStatic.h"
19 #include "llvm/Support/raw_ostream.h"
23 static ManagedStatic<PseudoSourceValue[4]> PSVs;
25 const PseudoSourceValue *PseudoSourceValue::getStack()
26 { return &(*PSVs)[0]; }
27 const PseudoSourceValue *PseudoSourceValue::getGOT()
28 { return &(*PSVs)[1]; }
29 const PseudoSourceValue *PseudoSourceValue::getJumpTable()
30 { return &(*PSVs)[2]; }
31 const PseudoSourceValue *PseudoSourceValue::getConstantPool()
32 { return &(*PSVs)[3]; }
34 static const char *const PSVNames[] = {
41 // FIXME: THIS IS A HACK!!!!
42 // Eventually these should be uniqued on LLVMContext rather than in a managed
43 // static. For now, we can safely use the global context for the time being to
45 PseudoSourceValue::PseudoSourceValue() :
46 Value(Type::getInt8PtrTy(getGlobalContext()),
47 PseudoSourceValueVal) {}
49 void PseudoSourceValue::printCustom(raw_ostream &O) const {
50 O << PSVNames[this - *PSVs];
54 /// FixedStackPseudoSourceValue - A specialized PseudoSourceValue
55 /// for holding FixedStack values, which must include a frame
57 class FixedStackPseudoSourceValue : public PseudoSourceValue {
60 explicit FixedStackPseudoSourceValue(int fi) : FI(fi) {}
62 virtual bool isConstant(const MachineFrameInfo *MFI) const;
64 virtual bool isAliased(const MachineFrameInfo *MFI) const;
66 virtual void printCustom(raw_ostream &OS) const {
67 OS << "FixedStack" << FI;
72 static ManagedStatic<std::map<int, const PseudoSourceValue *> > FSValues;
74 const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
75 const PseudoSourceValue *&V = (*FSValues)[FI];
77 V = new FixedStackPseudoSourceValue(FI);
81 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
82 if (this == getStack())
84 if (this == getGOT() ||
85 this == getConstantPool() ||
86 this == getJumpTable())
88 llvm_unreachable("Unknown PseudoSourceValue!");
92 bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
93 if (this == getStack() ||
95 this == getConstantPool() ||
96 this == getJumpTable())
98 llvm_unreachable("Unknown PseudoSourceValue!");
102 bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
103 return MFI && MFI->isImmutableObjectIndex(FI);
106 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
107 // Negative frame indices are used for special things that don't
108 // appear in LLVM IR. Non-negative indices may be used for things
109 // like static allocas.
112 // Spill slots should not alias others.
113 return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);