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//===- llvm/Analysis/MemoryDependenceAnalysis.h - Memory Deps --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the Owen Anderson and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an analysis that determines, for a given memory operation,
// what preceding memory operations it depends on. It builds on alias analysis
// information, and tries to provide a lazy, caching interface to a common kind
// of alias information query.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
#define LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
#include "llvm/Pass.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/Compiler.h"
#include <map>
namespace llvm {
class Function;
class FunctionPass;
class Instruction;
class VISIBILITY_HIDDEN MemoryDependenceAnalysis : public FunctionPass {
private:
DenseMap<Instruction*, std::pair<Instruction*, bool> > depGraphLocal;
std::multimap<Instruction*, Instruction*> reverseDep;
public:
static Instruction* NonLocal;
static Instruction* None;
static char ID; // Class identification, replacement for typeinfo
MemoryDependenceAnalysis() : FunctionPass((intptr_t)&ID) {}
/// Pass Implementation stuff. This doesn't do any analysis.
///
bool runOnFunction(Function &) {
depGraphLocal.clear();
reverseDep.clear();
return false;
}
/// getAnalysisUsage - Does not modify anything. It uses Value Numbering
/// and Alias Analysis.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
/// getDependency - Return the instruction on which a memory operation
/// depends.
Instruction* getDependency(Instruction* query, bool local = true);
/// removeInstruction - Remove an instruction from the dependence analysis,
/// updating the dependence of instructions that previously depended on it.
void removeInstruction(Instruction* rem);
};
} // End llvm namespace
#endif
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