lib/CodeGen/PseudoSourceValue.cpp

   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/CodeGen/TargetInstrInfo.h"
  18 #include "llvm/IR/DerivedTypes.h"
  19 #include "llvm/IR/LLVMContext.h"
  20 #include "llvm/Support/ErrorHandling.h"
  21 #include "llvm/Support/raw_ostream.h"
  22 using namespace llvm;
  23
  24 static const char *const PSVNames[] = {
  25     "Stack", "GOT", "JumpTable", "ConstantPool", "FixedStack",
  26     "GlobalValueCallEntry", "ExternalSymbolCallEntry"};
  27
  28 PseudoSourceValue::PseudoSourceValue(unsigned Kind, const TargetInstrInfo &TII)
  29     : Kind(Kind) {
  30   AddressSpace = TII.getAddressSpaceForPseudoSourceKind(Kind);
  31 }
  32
  33
  34 PseudoSourceValue::~PseudoSourceValue() {}
  35
  36 void PseudoSourceValue::printCustom(raw_ostream &O) const {
  37   if (Kind < TargetCustom)
  38     O << PSVNames[Kind];
  39   else
  40     O << "TargetCustom" << Kind;
  41 }
  42
  43 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
  44   if (isStack())
  45     return false;
  46   if (isGOT() || isConstantPool() || isJumpTable())
  47     return true;
  48   llvm_unreachable("Unknown PseudoSourceValue!");
  49 }
  50
  51 bool PseudoSourceValue::isAliased(const MachineFrameInfo *) const {
  52   if (isStack() || isGOT() || isConstantPool() || isJumpTable())
  53     return false;
  54   llvm_unreachable("Unknown PseudoSourceValue!");
  55 }
  56
  57 bool PseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
  58   return !(isGOT() || isConstantPool() || isJumpTable());
  59 }
  60
  61 bool FixedStackPseudoSourceValue::isConstant(
  62     const MachineFrameInfo *MFI) const {
  63   return MFI && MFI->isImmutableObjectIndex(FI);
  64 }
  65
  66 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
  67   if (!MFI)
  68     return true;
  69   return MFI->isAliasedObjectIndex(FI);
  70 }
  71
  72 bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
  73   if (!MFI)
  74     return true;
  75   // Spill slots will not alias any LLVM IR value.
  76   return !MFI->isSpillSlotObjectIndex(FI);
  77 }
  78
  79 void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
  80   OS << "FixedStack" << FI;
  81 }
  82
  83 CallEntryPseudoSourceValue::CallEntryPseudoSourceValue(
  84     unsigned Kind, const TargetInstrInfo &TII)
  85     : PseudoSourceValue(Kind, TII) {}
  86
  87 bool CallEntryPseudoSourceValue::isConstant(const MachineFrameInfo *) const {
  88   return false;
  89 }
  90
  91 bool CallEntryPseudoSourceValue::isAliased(const MachineFrameInfo *) const {
  92   return false;
  93 }
  94
  95 bool CallEntryPseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
  96   return false;
  97 }
  98
  99 GlobalValuePseudoSourceValue::GlobalValuePseudoSourceValue(
 100     const GlobalValue *GV,
 101     const TargetInstrInfo &TII)
 102     : CallEntryPseudoSourceValue(GlobalValueCallEntry, TII), GV(GV) {}
 103 ExternalSymbolPseudoSourceValue::ExternalSymbolPseudoSourceValue(
 104     const char *ES, const TargetInstrInfo &TII)
 105     : CallEntryPseudoSourceValue(ExternalSymbolCallEntry, TII), ES(ES) {}
 106
 107 PseudoSourceValueManager::PseudoSourceValueManager(
 108     const TargetInstrInfo &TIInfo)
 109     : TII(TIInfo),
 110       StackPSV(PseudoSourceValue::Stack, TII),
 111       GOTPSV(PseudoSourceValue::GOT, TII),
 112       JumpTablePSV(PseudoSourceValue::JumpTable, TII),
 113       ConstantPoolPSV(PseudoSourceValue::ConstantPool, TII) {}
 114
 115 const PseudoSourceValue *PseudoSourceValueManager::getStack() {
 116   return &StackPSV;
 117 }
 118
 119 const PseudoSourceValue *PseudoSourceValueManager::getGOT() { return &GOTPSV; }
 120
 121 const PseudoSourceValue *PseudoSourceValueManager::getConstantPool() {
 122   return &ConstantPoolPSV;
 123 }
 124
 125 const PseudoSourceValue *PseudoSourceValueManager::getJumpTable() {
 126   return &JumpTablePSV;
 127 }
 128
 129 const PseudoSourceValue *
 130 PseudoSourceValueManager::getFixedStack(int FI) {
 131   std::unique_ptr<FixedStackPseudoSourceValue> &V = FSValues[FI];
 132   if (!V)
 133     V = llvm::make_unique<FixedStackPseudoSourceValue>(FI, TII);
 134   return V.get();
 135 }
 136
 137 const PseudoSourceValue *
 138 PseudoSourceValueManager::getGlobalValueCallEntry(const GlobalValue *GV) {
 139   std::unique_ptr<const GlobalValuePseudoSourceValue> &E =
 140       GlobalCallEntries[GV];
 141   if (!E)
 142     E = llvm::make_unique<GlobalValuePseudoSourceValue>(GV, TII);
 143   return E.get();
 144 }
 145
 146 const PseudoSourceValue *
 147 PseudoSourceValueManager::getExternalSymbolCallEntry(const char *ES) {
 148   std::unique_ptr<const ExternalSymbolPseudoSourceValue> &E =
 149       ExternalCallEntries[ES];
 150   if (!E)
 151     E = llvm::make_unique<ExternalSymbolPseudoSourceValue>(ES, TII);
 152   return E.get();
 153 }