class VirtRegMap {
public:
- typedef DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
- typedef DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
- typedef std::multimap<MachineInstr*, unsigned> MI2VirtMap;
+ enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
+ typedef std::multimap<MachineInstr*,
+ std::pair<unsigned, ModRef> > MI2VirtMapTy;
private:
- MachineFunction* mf_;
- Virt2PhysMap v2pMap_;
- Virt2StackSlotMap v2ssMap_;
- MI2VirtMap mi2vMap_;
-
+ MachineFunction &MF;
+ /// Virt2PhysMap - This is a virtual to physical register
+ /// mapping. Each virtual register is required to have an entry in
+ /// it; even spilled virtual registers (the register mapped to a
+ /// spilled register is the temporary used to load it from the
+ /// stack).
+ DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
+ /// Virt2StackSlotMap - This is virtual register to stack slot
+ /// mapping. Each spilled virtual register has an entry in it
+ /// which corresponds to the stack slot this register is spilled
+ /// at.
+ DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
+ /// MI2VirtMap - This is MachineInstr to virtual register
+ /// mapping. In the case of memory spill code being folded into
+ /// instructions, we need to know which virtual register was
+ /// read/written by this instruction.
+ MI2VirtMapTy MI2VirtMap;
+
VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
};
public:
- VirtRegMap(MachineFunction& mf)
- : mf_(&mf), v2pMap_(NO_PHYS_REG), v2ssMap_(NO_STACK_SLOT) {
+ VirtRegMap(MachineFunction &mf)
+ : MF(mf), Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT) {
grow();
}
void grow();
+ /// @brief returns true if the specified virtual register is
+ /// mapped to a physical register
bool hasPhys(unsigned virtReg) const {
return getPhys(virtReg) != NO_PHYS_REG;
}
+ /// @brief returns the physical register mapped to the specified
+ /// virtual register
unsigned getPhys(unsigned virtReg) const {
assert(MRegisterInfo::isVirtualRegister(virtReg));
- return v2pMap_[virtReg];
+ return Virt2PhysMap[virtReg];
}
+ /// @brief creates a mapping for the specified virtual register to
+ /// the specified physical register
void assignVirt2Phys(unsigned virtReg, unsigned physReg) {
assert(MRegisterInfo::isVirtualRegister(virtReg) &&
MRegisterInfo::isPhysicalRegister(physReg));
- assert(v2pMap_[virtReg] == NO_PHYS_REG &&
+ assert(Virt2PhysMap[virtReg] == NO_PHYS_REG &&
"attempt to assign physical register to already mapped "
"virtual register");
- v2pMap_[virtReg] = physReg;
+ Virt2PhysMap[virtReg] = physReg;
}
+ /// @brief clears the specified virtual register's, physical
+ /// register mapping
void clearVirt(unsigned virtReg) {
assert(MRegisterInfo::isVirtualRegister(virtReg));
- assert(v2pMap_[virtReg] != NO_PHYS_REG &&
+ assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
"attempt to clear a not assigned virtual register");
- v2pMap_[virtReg] = NO_PHYS_REG;
+ Virt2PhysMap[virtReg] = NO_PHYS_REG;
}
+ /// @brief clears all virtual to physical register mappings
void clearAllVirt() {
- v2pMap_.clear();
+ Virt2PhysMap.clear();
grow();
}
+ /// @brief returns true is the specified virtual register is
+ /// mapped to a stack slot
bool hasStackSlot(unsigned virtReg) const {
return getStackSlot(virtReg) != NO_STACK_SLOT;
}
+ /// @brief returns the stack slot mapped to the specified virtual
+ /// register
int getStackSlot(unsigned virtReg) const {
assert(MRegisterInfo::isVirtualRegister(virtReg));
- return v2ssMap_[virtReg];
+ return Virt2StackSlotMap[virtReg];
}
+ /// @brief create a mapping for the specifed virtual register to
+ /// the next available stack slot
int assignVirt2StackSlot(unsigned virtReg);
+ /// @brief create a mapping for the specified virtual register to
+ /// the specified stack slot
void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
- void virtFolded(unsigned virtReg, MachineInstr* oldMI,
- MachineInstr* newMI);
+ /// @brief Updates information about the specified virtual register's value
+ /// folded into newMI machine instruction. The OpNum argument indicates the
+ /// operand number of OldMI that is folded.
+ void virtFolded(unsigned VirtReg, MachineInstr *OldMI, unsigned OpNum,
+ MachineInstr *NewMI);
- std::pair<MI2VirtMap::const_iterator, MI2VirtMap::const_iterator>
+ /// @brief returns the virtual registers' values folded in memory
+ /// operands of this instruction
+ std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>
getFoldedVirts(MachineInstr* MI) const {
- return mi2vMap_.equal_range(MI);
+ return MI2VirtMap.equal_range(MI);
}
void print(std::ostream &OS) const;