[llvm-commits] CVS: llvm/lib/CodeGen/VirtRegMap.h
Alkis Evlogimenos
alkis at cs.uiuc.edu
Thu Sep 30 17:35:18 PDT 2004
Changes in directory llvm/lib/CodeGen:
VirtRegMap.h updated: 1.15 -> 1.16
---
Log message:
Document this class a bit :-)
---
Diffs of the changes: (+34 -0)
Index: llvm/lib/CodeGen/VirtRegMap.h
diff -u llvm/lib/CodeGen/VirtRegMap.h:1.15 llvm/lib/CodeGen/VirtRegMap.h:1.16
--- llvm/lib/CodeGen/VirtRegMap.h:1.15 Wed Sep 29 21:15:18 2004
+++ llvm/lib/CodeGen/VirtRegMap.h Thu Sep 30 19:35:07 2004
@@ -30,8 +30,21 @@
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 @@
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 @@
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 @@
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);
More information about the llvm-commits
mailing list