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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 
     27 PseudoSourceValue::PseudoSourceValue(PSVKind Kind) : Kind(Kind) {}
     28 
     29 PseudoSourceValue::~PseudoSourceValue() {}
     30 
     31 void PseudoSourceValue::printCustom(raw_ostream &O) const {
     32   O << PSVNames[Kind];
     33 }
     34 
     35 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 
     43 bool PseudoSourceValue::isAliased(const MachineFrameInfo *) const {
     44   if (isStack() || isGOT() || isConstantPool() || isJumpTable())
     45     return false;
     46   llvm_unreachable("Unknown PseudoSourceValue!");
     47 }
     48 
     49 bool PseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
     50   return !(isGOT() || isConstantPool() || isJumpTable());
     51 }
     52 
     53 bool FixedStackPseudoSourceValue::isConstant(
     54     const MachineFrameInfo *MFI) const {
     55   return MFI && MFI->isImmutableObjectIndex(FI);
     56 }
     57 
     58 bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
     59   if (!MFI)
     60     return true;
     61   return MFI->isAliasedObjectIndex(FI);
     62 }
     63 
     64 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 
     71 void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
     72   OS << "FixedStack" << FI;
     73 }
     74 
     75 CallEntryPseudoSourceValue::CallEntryPseudoSourceValue(PSVKind Kind)
     76     : PseudoSourceValue(Kind) {}
     77 
     78 bool CallEntryPseudoSourceValue::isConstant(const MachineFrameInfo *) const {
     79   return false;
     80 }
     81 
     82 bool CallEntryPseudoSourceValue::isAliased(const MachineFrameInfo *) const {
     83   return false;
     84 }
     85 
     86 bool CallEntryPseudoSourceValue::mayAlias(const MachineFrameInfo *) const {
     87   return false;
     88 }
     89 
     90 GlobalValuePseudoSourceValue::GlobalValuePseudoSourceValue(
     91     const GlobalValue *GV)
     92     : CallEntryPseudoSourceValue(GlobalValueCallEntry), GV(GV) {}
     93 
     94 ExternalSymbolPseudoSourceValue::ExternalSymbolPseudoSourceValue(const char *ES)
     95     : CallEntryPseudoSourceValue(ExternalSymbolCallEntry), ES(ES) {}
     96 
     97 PseudoSourceValueManager::PseudoSourceValueManager()
     98     : StackPSV(PseudoSourceValue::Stack), GOTPSV(PseudoSourceValue::GOT),
     99       JumpTablePSV(PseudoSourceValue::JumpTable),
    100       ConstantPoolPSV(PseudoSourceValue::ConstantPool) {}
    101 
    102 const PseudoSourceValue *PseudoSourceValueManager::getStack() {
    103   return &StackPSV;
    104 }
    105 
    106 const PseudoSourceValue *PseudoSourceValueManager::getGOT() { return &GOTPSV; }
    107 
    108 const PseudoSourceValue *PseudoSourceValueManager::getConstantPool() {
    109   return &ConstantPoolPSV;
    110 }
    111 
    112 const PseudoSourceValue *PseudoSourceValueManager::getJumpTable() {
    113   return &JumpTablePSV;
    114 }
    115 
    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 *
    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 *
    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