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13cc88f694
This reverts commit 6c728daa61.
This is a speculative revert to try and fix the ASAN build.
92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
//===--- RCIdentityAnalysis.h -----------------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This is an analysis that determines the ref count identity (i.e. gc root) of
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// a pointer. Any values with the same ref count identity are able to be
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// retained and released interchangeably.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_SILOPTIMIZER_ANALYSIS_RCIDENTITYANALYSIS_H
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#define SWIFT_SILOPTIMIZER_ANALYSIS_RCIDENTITYANALYSIS_H
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#include "swift/SIL/SILValue.h"
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#include "swift/SIL/SILArgument.h"
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#include "swift/SILOptimizer/Analysis/Analysis.h"
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#include "swift/SILOptimizer/Analysis/DominanceAnalysis.h"
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#include "swift/SILOptimizer/PassManager/PassManager.h"
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namespace swift {
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class DominanceAnalysis;
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/// This class is a simple wrapper around an identity cache.
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class RCIdentityFunctionInfo {
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llvm::DenseSet<SILArgument *> VisitedArgs;
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DominanceAnalysis *DA;
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/// This number is arbitrary and conservative. At some point if compile time
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/// is not an issue, this value should be made more aggressive (i.e. greater).
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enum { MaxRecursionDepth = 16 };
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public:
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RCIdentityFunctionInfo(DominanceAnalysis *D) : VisitedArgs(),
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DA(D) {}
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SILValue getRCIdentityRoot(SILValue V);
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/// Return all recursive users of V, looking through users which propagate
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/// RCIdentity. *NOTE* This ignores obvious ARC escapes where the a potential
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/// user of the RC is not managed by ARC. For instance
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/// unchecked_trivial_bit_cast.
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void getRCUsers(SILValue V, llvm::SmallVectorImpl<SILInstruction *> &Users);
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private:
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SILValue getRCIdentityRootInner(SILValue V, unsigned RecursionDepth);
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SILValue stripRCIdentityPreservingOps(SILValue V, unsigned RecursionDepth);
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SILValue stripRCIdentityPreservingArgs(SILValue V, unsigned RecursionDepth);
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SILValue stripOneRCIdentityIncomingValue(SILArgument *Arg, SILValue V);
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bool findDominatingNonPayloadedEdge(SILBasicBlock *IncomingEdgeBB,
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SILValue RCIdentity);
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};
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class RCIdentityAnalysis : public FunctionAnalysisBase<RCIdentityFunctionInfo> {
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DominanceAnalysis *DA;
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public:
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RCIdentityAnalysis(SILModule *)
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: FunctionAnalysisBase<RCIdentityFunctionInfo>(AnalysisKind::RCIdentity),
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DA(nullptr) {}
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RCIdentityAnalysis(const RCIdentityAnalysis &) = delete;
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RCIdentityAnalysis &operator=(const RCIdentityAnalysis &) = delete;
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static bool classof(const SILAnalysis *S) {
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return S->getKind() == AnalysisKind::RCIdentity;
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}
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virtual void initialize(SILPassManager *PM) override;
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virtual RCIdentityFunctionInfo *newFunctionAnalysis(SILFunction *F) override {
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return new RCIdentityFunctionInfo(DA);
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}
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virtual bool shouldInvalidate(SILAnalysis::InvalidationKind K) override {
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return true;
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}
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};
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} // end swift namespace
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#endif
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