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111 lines
4.0 KiB
C++
111 lines
4.0 KiB
C++
//===- llvm/Analysis/MemoryDependenceAnalysis.h - Memory Deps --*- 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 Owen Anderson 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 defines an analysis that determines, for a given memory operation,
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// what preceding memory operations it depends on. It builds on alias analysis
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// information, and tries to provide a lazy, caching interface to a common kind
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// of alias information query.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
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#define LLVM_ANALYSIS_MEMORY_DEPENDENCE_H
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#include "llvm/Pass.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class Function;
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class FunctionPass;
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class Instruction;
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class MemoryDependenceAnalysis : public FunctionPass {
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private:
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// A map from instructions to their dependency, with a boolean
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// flags for whether this mapping is confirmed or not
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typedef DenseMap<Instruction*, std::pair<Instruction*, bool> >
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depMapType;
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depMapType depGraphLocal;
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// A map from instructions to their non-local dependencies.
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typedef DenseMap<Instruction*, DenseMap<BasicBlock*, Value*> >
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nonLocalDepMapType;
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nonLocalDepMapType depGraphNonLocal;
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// A reverse mapping form dependencies to the dependees. This is
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// used when removing instructions to keep the cache coherent.
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typedef DenseMap<Value*, SmallPtrSet<Instruction*, 4> >
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reverseDepMapType;
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reverseDepMapType reverseDep;
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// A reverse mapping form dependencies to the non-local dependees.
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reverseDepMapType reverseDepNonLocal;
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public:
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// Special marker indicating that the query has no dependency
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// in the specified block.
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static Instruction* const NonLocal;
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// Special marker indicating that the query has no dependency at all
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static Instruction* const None;
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// Special marker indicating a dirty cache entry
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static Instruction* const Dirty;
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static char ID; // Class identification, replacement for typeinfo
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MemoryDependenceAnalysis() : FunctionPass((intptr_t)&ID) {}
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/// Pass Implementation stuff. This doesn't do any analysis.
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///
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bool runOnFunction(Function &) {return false; }
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/// Clean up memory in between runs
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void releaseMemory() {
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depGraphLocal.clear();
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depGraphNonLocal.clear();
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reverseDep.clear();
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reverseDepNonLocal.clear();
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}
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/// getAnalysisUsage - Does not modify anything. It uses Value Numbering
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/// and Alias Analysis.
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///
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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/// getDependency - Return the instruction on which a memory operation
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/// depends, starting with start.
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Instruction* getDependency(Instruction* query, Instruction* start = 0,
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BasicBlock* block = 0);
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/// getNonLocalDependency - Fills the passed-in map with the non-local
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/// dependencies of the queries. The map will contain NonLocal for
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/// blocks between the query and its dependencies.
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void getNonLocalDependency(Instruction* query,
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DenseMap<BasicBlock*, Value*>& resp);
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/// removeInstruction - Remove an instruction from the dependence analysis,
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/// updating the dependence of instructions that previously depended on it.
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void removeInstruction(Instruction* rem);
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private:
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Instruction* getCallSiteDependency(CallSite C, Instruction* start,
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BasicBlock* block);
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void nonLocalHelper(Instruction* query, BasicBlock* block,
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DenseMap<BasicBlock*, Value*>& resp);
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};
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} // End llvm namespace
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#endif
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