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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57649 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
//===------------- EscapeAnalysis.h - Pointer escape analysis -------------===//
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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 defines the interface for the pointer escape analysis.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_ESCAPEANALYSIS_H
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#define LLVM_ANALYSIS_ESCAPEANALYSIS_H
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#include "llvm/Pass.h"
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#include "llvm/Instructions.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Target/TargetData.h"
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#include <set>
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namespace llvm {
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/// EscapeAnalysis - This class determines whether an allocation (a MallocInst
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/// or an AllocaInst) can escape from the current function. It performs some
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/// precomputation, with the rest of the work happening on-demand.
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class EscapeAnalysis : public FunctionPass {
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private:
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std::set<Instruction*> EscapePoints;
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public:
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static char ID; // Class identification, replacement for typeinfo
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EscapeAnalysis() : FunctionPass(intptr_t(&ID)) {}
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bool runOnFunction(Function &F);
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void releaseMemory() {
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EscapePoints.clear();
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}
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredTransitive<TargetData>();
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AU.addRequiredTransitive<AliasAnalysis>();
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AU.setPreservesAll();
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}
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//===---------------------------------------------------------------------
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// Client API
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/// escapes - returns true if the value, which must have a pointer type,
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/// can escape.
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bool escapes(Value* A);
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};
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} // end llvm namespace
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#endif
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