forked from OSchip/llvm-project
80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
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//===- DependencyAnalysis.h - ObjC ARC Optimization ---*- mode: c++ -*-----===//
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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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/// \file
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///
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/// This file declares special dependency analysis routines used in Objective C
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/// ARC Optimizations.
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///
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/// WARNING: This file knows about certain library functions. It recognizes them
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/// by name, and hardwires knowledge of their semantics.
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///
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/// WARNING: This file knows about how certain Objective-C library functions are
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/// used. Naive LLVM IR transformations which would otherwise be
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/// behavior-preserving may break these assumptions.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H
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#define LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H
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#include "llvm/ADT/SmallPtrSet.h"
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namespace llvm {
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class BasicBlock;
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class Instruction;
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class Value;
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}
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namespace llvm {
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namespace objcarc {
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class ProvenanceAnalysis;
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/// \enum DependenceKind
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/// \brief Defines different dependence kinds among various ARC constructs.
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///
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/// There are several kinds of dependence-like concepts in use here.
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///
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enum DependenceKind {
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NeedsPositiveRetainCount,
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AutoreleasePoolBoundary,
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CanChangeRetainCount,
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RetainAutoreleaseDep, ///< Blocks objc_retainAutorelease.
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RetainAutoreleaseRVDep, ///< Blocks objc_retainAutoreleaseReturnValue.
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RetainRVDep ///< Blocks objc_retainAutoreleasedReturnValue.
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};
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void FindDependencies(DependenceKind Flavor,
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const Value *Arg,
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BasicBlock *StartBB, Instruction *StartInst,
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SmallPtrSet<Instruction *, 4> &DependingInstructions,
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SmallPtrSet<const BasicBlock *, 4> &Visited,
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ProvenanceAnalysis &PA);
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bool
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Depends(DependenceKind Flavor, Instruction *Inst, const Value *Arg,
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ProvenanceAnalysis &PA);
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/// Test whether the given instruction can "use" the given pointer's object in a
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/// way that requires the reference count to be positive.
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bool
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CanUse(const Instruction *Inst, const Value *Ptr, ProvenanceAnalysis &PA,
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InstructionClass Class);
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/// Test whether the given instruction can result in a reference count
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/// modification (positive or negative) for the pointer's object.
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bool
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CanAlterRefCount(const Instruction *Inst, const Value *Ptr,
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ProvenanceAnalysis &PA, InstructionClass Class);
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} // namespace objcarc
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} // namespace llvm
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#endif // LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H
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