//===-- LiveStackAnalysis.h - Live Stack Slot Analysis ----------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the live stack slot analysis pass. It is analogous to // live interval analysis except it's analyzing liveness of stack slots rather // than registers. // //===----------------------------------------------------------------------===// #ifndef LLVM_CODEGEN_LIVESTACK_ANALYSIS_H #define LLVM_CODEGEN_LIVESTACK_ANALYSIS_H #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/LiveInterval.h" #include "llvm/Support/Allocator.h" #include <map> namespace llvm { class LiveStacks : public MachineFunctionPass { /// Special pool allocator for VNInfo's (LiveInterval val#). /// BumpPtrAllocator VNInfoAllocator; /// s2iMap - Stack slot indices to live interval mapping. /// typedef std::map<int, LiveInterval> SS2IntervalMap; SS2IntervalMap s2iMap; public: static char ID; // Pass identification, replacement for typeid LiveStacks() : MachineFunctionPass(&ID) {} typedef SS2IntervalMap::iterator iterator; typedef SS2IntervalMap::const_iterator const_iterator; const_iterator begin() const { return s2iMap.begin(); } const_iterator end() const { return s2iMap.end(); } iterator begin() { return s2iMap.begin(); } iterator end() { return s2iMap.end(); } unsigned getNumIntervals() const { return (unsigned)s2iMap.size(); } LiveInterval &getOrCreateInterval(int Slot) { SS2IntervalMap::iterator I = s2iMap.find(Slot); if (I == s2iMap.end()) I = s2iMap.insert(I,std::make_pair(Slot,LiveInterval(Slot,0.0F,true))); return I->second; } LiveInterval &getInterval(int Slot) { SS2IntervalMap::iterator I = s2iMap.find(Slot); assert(I != s2iMap.end() && "Interval does not exist for stack slot"); return I->second; } const LiveInterval &getInterval(int Slot) const { SS2IntervalMap::const_iterator I = s2iMap.find(Slot); assert(I != s2iMap.end() && "Interval does not exist for stack slot"); return I->second; } bool hasInterval(unsigned reg) const { return s2iMap.count(reg); } BumpPtrAllocator& getVNInfoAllocator() { return VNInfoAllocator; } virtual void getAnalysisUsage(AnalysisUsage &AU) const; virtual void releaseMemory(); /// runOnMachineFunction - pass entry point virtual bool runOnMachineFunction(MachineFunction&); /// print - Implement the dump method. virtual void print(std::ostream &O, const Module* = 0) const; void print(std::ostream *O, const Module* M = 0) const { if (O) print(*O, M); } }; } #endif /* LLVM_CODEGEN_LIVESTACK_ANALYSIS_H */