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//===-- llvm/CodeGen/VirtRegMap.h - Virtual Register Map -*- C++ -*--------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements a virtual register map. This maps virtual
// registers to physical registers and virtual registers to stack
// slots. It is created and updated by a register allocator and then
// used by a machine code rewriter that adds spill code and rewrites
// virtual into physical register references.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_VIRTREGMAP_H
#define LLVM_CODEGEN_VIRTREGMAP_H
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "Support/DenseMap.h"
#include <climits>
#include <map>
namespace llvm {
class MachineInstr;
class VirtRegMap {
public:
typedef DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
typedef DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
typedef std::multimap<MachineInstr*, unsigned> MI2VirtMap;
private:
MachineFunction* mf_;
Virt2PhysMap v2pMap_;
Virt2StackSlotMap v2ssMap_;
MI2VirtMap mi2vMap_;
// do not implement
VirtRegMap(const VirtRegMap& rhs);
const VirtRegMap& operator=(const VirtRegMap& rhs);
enum {
NO_PHYS_REG = 0,
NO_STACK_SLOT = INT_MAX
};
public:
VirtRegMap(MachineFunction& mf)
: mf_(&mf),
v2pMap_(NO_PHYS_REG),
v2ssMap_(NO_STACK_SLOT) {
grow();
}
void grow() {
v2pMap_.grow(mf_->getSSARegMap()->getLastVirtReg());
v2ssMap_.grow(mf_->getSSARegMap()->getLastVirtReg());
}
bool hasPhys(unsigned virtReg) const {
return getPhys(virtReg) != NO_PHYS_REG;
}
unsigned getPhys(unsigned virtReg) const {
assert(MRegisterInfo::isVirtualRegister(virtReg));
return v2pMap_[virtReg];
}
void assignVirt2Phys(unsigned virtReg, unsigned physReg) {
assert(MRegisterInfo::isVirtualRegister(virtReg) &&
MRegisterInfo::isPhysicalRegister(physReg));
assert(v2pMap_[virtReg] == NO_PHYS_REG &&
"attempt to assign physical register to already mapped "
"virtual register");
v2pMap_[virtReg] = physReg;
}
void clearVirt(unsigned virtReg) {
assert(MRegisterInfo::isVirtualRegister(virtReg));
assert(v2pMap_[virtReg] != NO_PHYS_REG &&
"attempt to clear a not assigned virtual register");
v2pMap_[virtReg] = NO_PHYS_REG;
}
bool hasStackSlot(unsigned virtReg) const {
return getStackSlot(virtReg) != NO_STACK_SLOT;
}
int getStackSlot(unsigned virtReg) const {
assert(MRegisterInfo::isVirtualRegister(virtReg));
return v2ssMap_[virtReg];
}
int assignVirt2StackSlot(unsigned virtReg);
void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
void virtFolded(unsigned virtReg,
MachineInstr* oldMI,
MachineInstr* newMI);
std::pair<MI2VirtMap::const_iterator, MI2VirtMap::const_iterator>
getFoldedVirts(MachineInstr* MI) const {
return mi2vMap_.equal_range(MI);
}
friend std::ostream& operator<<(std::ostream& os, const VirtRegMap& li);
};
std::ostream& operator<<(std::ostream& os, const VirtRegMap& li);
struct Spiller {
virtual ~Spiller();
virtual bool runOnMachineFunction(MachineFunction& mf, const VirtRegMap& vrm) = 0;
};
Spiller* createSpiller();
} // End llvm namespace
#endif
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