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