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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/PseudoSourceValue.h"
15 #include "llvm/ADT/STLExtras.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/IR/DerivedTypes.h"
18 #include "llvm/IR/LLVMContext.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/raw_ostream.h"
21 using namespace llvm;
22 
23 static const char *const PSVNames[] = {
24     "Stack", "GOT", "JumpTable", "ConstantPool", "FixedStack",
25     "GlobalValueCallEntry", "ExternalSymbolCallEntry"};
26 
PseudoSourceValue(PSVKind Kind)27 PseudoSourceValue::PseudoSourceValue(PSVKind Kind) : Kind(Kind) {}
28 
~PseudoSourceValue()29 PseudoSourceValue::~PseudoSourceValue() {}
30 
printCustom(raw_ostream & O) const31 void PseudoSourceValue::printCustom(raw_ostream &O) const {
32   O << PSVNames[Kind];
33 }
34 
isConstant(const MachineFrameInfo *) const35 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
36   if (isStack())
37     return false;
38   if (isGOT() || isConstantPool() || isJumpTable())
39     return true;
40   llvm_unreachable("Unknown PseudoSourceValue!");
41 }
42 
isAliased(const MachineFrameInfo *) const43 bool PseudoSourceValue::isAliased(const MachineFrameInfo *) const {
44   if (isStack() || isGOT() || isConstantPool() || isJumpTable())
45     return false;
46   llvm_unreachable("Unknown PseudoSourceValue!");
47 }
48 
mayAlias(const MachineFrameInfo *) const49 bool PseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
50   return !(isGOT() || isConstantPool() || isJumpTable());
51 }
52 
isConstant(const MachineFrameInfo * MFI) const53 bool FixedStackPseudoSourceValue::isConstant(
54     const MachineFrameInfo *MFI) const {
55   return MFI && MFI->isImmutableObjectIndex(FI);
56 }
57 
isAliased(const MachineFrameInfo * MFI) const58 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
59   if (!MFI)
60     return true;
61   return MFI->isAliasedObjectIndex(FI);
62 }
63 
mayAlias(const MachineFrameInfo * MFI) const64 bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
65   if (!MFI)
66     return true;
67   // Spill slots will not alias any LLVM IR value.
68   return !MFI->isSpillSlotObjectIndex(FI);
69 }
70 
printCustom(raw_ostream & OS) const71 void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
72   OS << "FixedStack" << FI;
73 }
74 
CallEntryPseudoSourceValue(PSVKind Kind)75 CallEntryPseudoSourceValue::CallEntryPseudoSourceValue(PSVKind Kind)
76     : PseudoSourceValue(Kind) {}
77 
isConstant(const MachineFrameInfo *) const78 bool CallEntryPseudoSourceValue::isConstant(const MachineFrameInfo *) const {
79   return false;
80 }
81 
isAliased(const MachineFrameInfo *) const82 bool CallEntryPseudoSourceValue::isAliased(const MachineFrameInfo *) const {
83   return false;
84 }
85 
mayAlias(const MachineFrameInfo *) const86 bool CallEntryPseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
87   return false;
88 }
89 
GlobalValuePseudoSourceValue(const GlobalValue * GV)90 GlobalValuePseudoSourceValue::GlobalValuePseudoSourceValue(
91     const GlobalValue *GV)
92     : CallEntryPseudoSourceValue(GlobalValueCallEntry), GV(GV) {}
93 
ExternalSymbolPseudoSourceValue(const char * ES)94 ExternalSymbolPseudoSourceValue::ExternalSymbolPseudoSourceValue(const char *ES)
95     : CallEntryPseudoSourceValue(ExternalSymbolCallEntry), ES(ES) {}
96 
PseudoSourceValueManager()97 PseudoSourceValueManager::PseudoSourceValueManager()
98     : StackPSV(PseudoSourceValue::Stack), GOTPSV(PseudoSourceValue::GOT),
99       JumpTablePSV(PseudoSourceValue::JumpTable),
100       ConstantPoolPSV(PseudoSourceValue::ConstantPool) {}
101 
getStack()102 const PseudoSourceValue *PseudoSourceValueManager::getStack() {
103   return &StackPSV;
104 }
105 
getGOT()106 const PseudoSourceValue *PseudoSourceValueManager::getGOT() { return &GOTPSV; }
107 
getConstantPool()108 const PseudoSourceValue *PseudoSourceValueManager::getConstantPool() {
109   return &ConstantPoolPSV;
110 }
111 
getJumpTable()112 const PseudoSourceValue *PseudoSourceValueManager::getJumpTable() {
113   return &JumpTablePSV;
114 }
115 
getFixedStack(int FI)116 const PseudoSourceValue *PseudoSourceValueManager::getFixedStack(int FI) {
117   std::unique_ptr<FixedStackPseudoSourceValue> &V = FSValues[FI];
118   if (!V)
119     V = llvm::make_unique<FixedStackPseudoSourceValue>(FI);
120   return V.get();
121 }
122 
123 const PseudoSourceValue *
getGlobalValueCallEntry(const GlobalValue * GV)124 PseudoSourceValueManager::getGlobalValueCallEntry(const GlobalValue *GV) {
125   std::unique_ptr<const GlobalValuePseudoSourceValue> &E =
126       GlobalCallEntries[GV];
127   if (!E)
128     E = llvm::make_unique<GlobalValuePseudoSourceValue>(GV);
129   return E.get();
130 }
131 
132 const PseudoSourceValue *
getExternalSymbolCallEntry(const char * ES)133 PseudoSourceValueManager::getExternalSymbolCallEntry(const char *ES) {
134   std::unique_ptr<const ExternalSymbolPseudoSourceValue> &E =
135       ExternalCallEntries[ES];
136   if (!E)
137     E = llvm::make_unique<ExternalSymbolPseudoSourceValue>(ES);
138   return E.get();
139 }
140