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//===------------- EscapeAnalysis.h - Pointer escape analysis -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interface for the pointer escape analysis.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_ESCAPEANALYSIS_H
#define LLVM_ANALYSIS_ESCAPEANALYSIS_H
#include "llvm/Pass.h"
#include "llvm/Instructions.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Target/TargetData.h"
#include <set>
namespace llvm {
/// EscapeAnalysis - This class determines whether an allocation (a MallocInst
/// or an AllocaInst) can escape from the current function. It performs some
/// precomputation, with the rest of the work happening on-demand.
class EscapeAnalysis : public FunctionPass {
private:
std::set<Instruction*> EscapePoints;
public:
static char ID; // Class identification, replacement for typeinfo
EscapeAnalysis() : FunctionPass(intptr_t(&ID)) {}
bool runOnFunction(Function &F);
void releaseMemory() {
EscapePoints.clear();
}
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredTransitive<TargetData>();
AU.addRequiredTransitive<AliasAnalysis>();
AU.setPreservesAll();
}
//===---------------------------------------------------------------------
// Client API
/// escapes - returns true if the value, which must have a pointer type,
/// can escape.
bool escapes(Value* A);
};
} // end llvm namespace
#endif
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