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Document this class a bit :-)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16626 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-10-01 00:35:07 +00:00
parent 4b97f23a00
commit c736b3a37a
1 changed files with 34 additions and 0 deletions
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34
lib/CodeGen/VirtRegMap.h
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@ -30,8 +30,21 @@ namespace llvm {
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
@ -50,15 +63,21 @@ namespace llvm {
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));
@ -68,6 +87,8 @@ namespace llvm {
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 &&
@ -75,26 +96,39 @@ namespace llvm {
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);
/// @brief updates information about the specified virtual
/// register's value folded into newMI machine instruction
void virtFolded(unsigned virtReg, MachineInstr* oldMI,
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);