class VirtRegMap {
public:
- typedef std::multimap<MachineInstr*, unsigned> MI2VirtMapTy;
+ enum ModRef { isRef = 1, isMod = 2, isModRef = 3 };
+ typedef std::multimap<MachineInstr*,
+ std::pair<unsigned, ModRef> > MI2VirtMapTy;
private:
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
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 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));
Virt2PhysMap[virtReg] = physReg;
}
+ /// @brief clears the specified virtual register's, physical
+ /// register mapping
void clearVirt(unsigned virtReg) {
assert(MRegisterInfo::isVirtualRegister(virtReg));
assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
Virt2PhysMap[virtReg] = NO_PHYS_REG;
}
+ /// @brief clears all virtual to physical register mappings
void clearAllVirt() {
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 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);
+ /// @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 MI2VirtMap.equal_range(MI);