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d27ff8035e
data structures). Fix the print method to send to the right ostream, not always cerr. Delete typedefs that are only used once. llvm-svn: 16606
127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
//===-- llvm/CodeGen/VirtRegMap.h - Virtual Register Map -*- C++ -*--------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a virtual register map. This maps virtual registers to
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// physical registers and virtual registers to stack slots. It is created and
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// updated by a register allocator and then used by a machine code rewriter that
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// adds spill code and rewrites virtual into physical register references.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_VIRTREGMAP_H
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#define LLVM_CODEGEN_VIRTREGMAP_H
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#include "llvm/Target/MRegisterInfo.h"
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#include "llvm/ADT/DenseMap.h"
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#include <map>
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namespace llvm {
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class MachineInstr;
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class VirtRegMap {
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public:
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typedef std::multimap<MachineInstr*, unsigned> MI2VirtMapTy;
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private:
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MachineFunction &MF;
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DenseMap<unsigned, VirtReg2IndexFunctor> Virt2PhysMap;
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DenseMap<int, VirtReg2IndexFunctor> Virt2StackSlotMap;
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MI2VirtMapTy MI2VirtMap;
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VirtRegMap(const VirtRegMap&); // DO NOT IMPLEMENT
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void operator=(const VirtRegMap&); // DO NOT IMPLEMENT
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enum {
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NO_PHYS_REG = 0,
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NO_STACK_SLOT = ~0 >> 1
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};
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public:
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VirtRegMap(MachineFunction &mf)
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: MF(mf), Virt2PhysMap(NO_PHYS_REG), Virt2StackSlotMap(NO_STACK_SLOT) {
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grow();
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}
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void grow();
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bool hasPhys(unsigned virtReg) const {
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return getPhys(virtReg) != NO_PHYS_REG;
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}
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unsigned getPhys(unsigned virtReg) const {
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assert(MRegisterInfo::isVirtualRegister(virtReg));
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return Virt2PhysMap[virtReg];
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}
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void assignVirt2Phys(unsigned virtReg, unsigned physReg) {
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assert(MRegisterInfo::isVirtualRegister(virtReg) &&
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MRegisterInfo::isPhysicalRegister(physReg));
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assert(Virt2PhysMap[virtReg] == NO_PHYS_REG &&
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"attempt to assign physical register to already mapped "
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"virtual register");
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Virt2PhysMap[virtReg] = physReg;
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}
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void clearVirt(unsigned virtReg) {
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assert(MRegisterInfo::isVirtualRegister(virtReg));
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assert(Virt2PhysMap[virtReg] != NO_PHYS_REG &&
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"attempt to clear a not assigned virtual register");
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Virt2PhysMap[virtReg] = NO_PHYS_REG;
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}
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void clearAllVirt() {
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Virt2PhysMap.clear();
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grow();
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}
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bool hasStackSlot(unsigned virtReg) const {
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return getStackSlot(virtReg) != NO_STACK_SLOT;
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}
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int getStackSlot(unsigned virtReg) const {
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assert(MRegisterInfo::isVirtualRegister(virtReg));
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return Virt2StackSlotMap[virtReg];
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}
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int assignVirt2StackSlot(unsigned virtReg);
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void assignVirt2StackSlot(unsigned virtReg, int frameIndex);
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void virtFolded(unsigned virtReg, MachineInstr* oldMI,
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MachineInstr* newMI);
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std::pair<MI2VirtMapTy::const_iterator, MI2VirtMapTy::const_iterator>
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getFoldedVirts(MachineInstr* MI) const {
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return MI2VirtMap.equal_range(MI);
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}
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void print(std::ostream &OS) const;
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void dump() const;
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};
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inline std::ostream &operator<<(std::ostream &OS, const VirtRegMap &VRM) {
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VRM.print(OS);
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return OS;
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}
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/// Spiller interface: Implementations of this interface assign spilled
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/// virtual registers to stack slots, rewriting the code.
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struct Spiller {
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virtual ~Spiller();
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virtual bool runOnMachineFunction(MachineFunction &MF,
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const VirtRegMap &VRM) = 0;
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};
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/// createSpiller - Create an return a spiller object, as specified on the
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/// command line.
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Spiller* createSpiller();
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} // End llvm namespace
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#endif
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