135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
//===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the PseudoSourceValue class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Mutex.h"
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#include <map>
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using namespace llvm;
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namespace {
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struct PSVGlobalsTy {
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// PseudoSourceValues are immutable so don't need locking.
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const PseudoSourceValue PSVs[4];
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sys::Mutex Lock; // Guards FSValues, but not the values inside it.
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std::map<int, const PseudoSourceValue *> FSValues;
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PSVGlobalsTy() : PSVs() {}
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~PSVGlobalsTy() {
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for (std::map<int, const PseudoSourceValue *>::iterator
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I = FSValues.begin(), E = FSValues.end(); I != E; ++I) {
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delete I->second;
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}
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}
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};
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static ManagedStatic<PSVGlobalsTy> PSVGlobals;
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} // anonymous namespace
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const PseudoSourceValue *PseudoSourceValue::getStack()
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{ return &PSVGlobals->PSVs[0]; }
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const PseudoSourceValue *PseudoSourceValue::getGOT()
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{ return &PSVGlobals->PSVs[1]; }
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const PseudoSourceValue *PseudoSourceValue::getJumpTable()
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{ return &PSVGlobals->PSVs[2]; }
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const PseudoSourceValue *PseudoSourceValue::getConstantPool()
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{ return &PSVGlobals->PSVs[3]; }
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static const char *const PSVNames[] = {
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"Stack",
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"GOT",
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"JumpTable",
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"ConstantPool"
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};
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// FIXME: THIS IS A HACK!!!!
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// Eventually these should be uniqued on LLVMContext rather than in a managed
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// static. For now, we can safely use the global context for the time being to
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// squeak by.
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PseudoSourceValue::PseudoSourceValue(enum ValueTy Subclass) :
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Value(Type::getInt8PtrTy(getGlobalContext()),
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Subclass) {}
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void PseudoSourceValue::printCustom(raw_ostream &O) const {
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O << PSVNames[this - PSVGlobals->PSVs];
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}
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const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
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PSVGlobalsTy &PG = *PSVGlobals;
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sys::ScopedLock locked(PG.Lock);
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const PseudoSourceValue *&V = PG.FSValues[FI];
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if (!V)
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V = new FixedStackPseudoSourceValue(FI);
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return V;
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}
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bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
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if (this == getStack())
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return false;
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if (this == getGOT() ||
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this == getConstantPool() ||
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this == getJumpTable())
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return true;
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llvm_unreachable("Unknown PseudoSourceValue!");
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return false;
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}
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bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
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if (this == getStack() ||
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this == getGOT() ||
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this == getConstantPool() ||
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this == getJumpTable())
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return false;
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llvm_unreachable("Unknown PseudoSourceValue!");
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return true;
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}
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bool PseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
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if (this == getGOT() ||
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this == getConstantPool() ||
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this == getJumpTable())
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return false;
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return true;
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}
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bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
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return MFI && MFI->isImmutableObjectIndex(FI);
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}
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bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
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// Negative frame indices are used for special things that don't
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// appear in LLVM IR. Non-negative indices may be used for things
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// like static allocas.
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if (!MFI)
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return FI >= 0;
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// Spill slots should not alias others.
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return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);
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}
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bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
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if (!MFI)
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return true;
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// Spill slots will not alias any LLVM IR value.
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return !MFI->isSpillSlotObjectIndex(FI);
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}
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void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
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OS << "FixedStack" << FI;
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}
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