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//===-- 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((intptr_t)&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;
}
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 */
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