113 lines
3.9 KiB
C++
113 lines
3.9 KiB
C++
//===-- LiveStackAnalysis.h - Live Stack Slot Analysis ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// 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 the live stack slot analysis pass. It is analogous to
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// live interval analysis except it's analyzing liveness of stack slots rather
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// than registers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_LIVESTACK_ANALYSIS_H
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#define LLVM_CODEGEN_LIVESTACK_ANALYSIS_H
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/LiveInterval.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Support/Allocator.h"
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#include <map>
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namespace llvm {
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class LiveStacks : public MachineFunctionPass {
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/// Special pool allocator for VNInfo's (LiveInterval val#).
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///
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BumpPtrAllocator VNInfoAllocator;
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/// S2IMap - Stack slot indices to live interval mapping.
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///
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typedef std::map<int, LiveInterval> SS2IntervalMap;
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SS2IntervalMap S2IMap;
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/// S2RCMap - Stack slot indices to register class mapping.
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std::map<int, const TargetRegisterClass*> S2RCMap;
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public:
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static char ID; // Pass identification, replacement for typeid
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LiveStacks() : MachineFunctionPass(&ID) {}
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typedef SS2IntervalMap::iterator iterator;
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typedef SS2IntervalMap::const_iterator const_iterator;
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const_iterator begin() const { return S2IMap.begin(); }
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const_iterator end() const { return S2IMap.end(); }
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iterator begin() { return S2IMap.begin(); }
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iterator end() { return S2IMap.end(); }
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void scaleNumbering(int factor);
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unsigned getNumIntervals() const { return (unsigned)S2IMap.size(); }
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LiveInterval &getOrCreateInterval(int Slot, const TargetRegisterClass *RC) {
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assert(Slot >= 0 && "Spill slot indice must be >= 0");
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SS2IntervalMap::iterator I = S2IMap.find(Slot);
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if (I == S2IMap.end()) {
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I = S2IMap.insert(I,std::make_pair(Slot, LiveInterval(Slot,0.0F,true)));
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S2RCMap.insert(std::make_pair(Slot, RC));
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} else {
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// Use the largest common subclass register class.
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const TargetRegisterClass *OldRC = S2RCMap[Slot];
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S2RCMap[Slot] = getCommonSubClass(OldRC, RC);
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}
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return I->second;
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}
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LiveInterval &getInterval(int Slot) {
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assert(Slot >= 0 && "Spill slot indice must be >= 0");
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SS2IntervalMap::iterator I = S2IMap.find(Slot);
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assert(I != S2IMap.end() && "Interval does not exist for stack slot");
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return I->second;
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}
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const LiveInterval &getInterval(int Slot) const {
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assert(Slot >= 0 && "Spill slot indice must be >= 0");
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SS2IntervalMap::const_iterator I = S2IMap.find(Slot);
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assert(I != S2IMap.end() && "Interval does not exist for stack slot");
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return I->second;
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}
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bool hasInterval(int Slot) const {
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return S2IMap.count(Slot);
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}
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const TargetRegisterClass *getIntervalRegClass(int Slot) const {
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assert(Slot >= 0 && "Spill slot indice must be >= 0");
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std::map<int, const TargetRegisterClass*>::const_iterator
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I = S2RCMap.find(Slot);
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assert(I != S2RCMap.end() &&
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"Register class info does not exist for stack slot");
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return I->second;
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}
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BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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virtual void releaseMemory();
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/// runOnMachineFunction - pass entry point
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virtual bool runOnMachineFunction(MachineFunction&);
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/// print - Implement the dump method.
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virtual void print(std::ostream &O, const Module* = 0) const;
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void print(std::ostream *O, const Module* M = 0) const {
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if (O) print(*O, M);
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}
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};
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}
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#endif /* LLVM_CODEGEN_LIVESTACK_ANALYSIS_H */
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