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author | Michael Gottesman <mgottesman@apple.com> | 2013-01-29 03:03:03 +0000 |
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committer | Michael Gottesman <mgottesman@apple.com> | 2013-01-29 03:03:03 +0000 |
commit | 3a57c37964adfbbf83b4b309a2ceda43ba6d8231 (patch) | |
tree | cc18ad0bbb23667ac2857158d1da9df137559f67 /lib/Transforms/ObjCARC/DependencyAnalysis.h | |
parent | 3b0f537867c7c661f63938cf71a1031b652c87a2 (diff) | |
download | llvm-3a57c37964adfbbf83b4b309a2ceda43ba6d8231.tar.gz llvm-3a57c37964adfbbf83b4b309a2ceda43ba6d8231.tar.bz2 llvm-3a57c37964adfbbf83b4b309a2ceda43ba6d8231.tar.xz |
Extracted ObjCARCContract from ObjCARCOpts into its own file.
This also required adding 2x headers Dependency Analysis.h/Provenance Analysis.h
and a .cpp file DependencyAnalysis.cpp to unentangle the dependencies inbetween
ObjCARCContract and ObjCARCOpts.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173760 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/ObjCARC/DependencyAnalysis.h')
-rw-r--r-- | lib/Transforms/ObjCARC/DependencyAnalysis.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/Transforms/ObjCARC/DependencyAnalysis.h b/lib/Transforms/ObjCARC/DependencyAnalysis.h new file mode 100644 index 0000000000..24d358b30a --- /dev/null +++ b/lib/Transforms/ObjCARC/DependencyAnalysis.h @@ -0,0 +1,79 @@ +//===- DependencyAnalysis.h - ObjC ARC Optimization ---*- mode: c++ -*-----===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +/// \file +/// +/// This file declares special dependency analysis routines used in Objective C +/// ARC Optimizations. +/// +/// WARNING: This file knows about certain library functions. It recognizes them +/// by name, and hardwires knowledge of their semantics. +/// +/// WARNING: This file knows about how certain Objective-C library functions are +/// used. Naive LLVM IR transformations which would otherwise be +/// behavior-preserving may break these assumptions. +/// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H +#define LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H + +#include "llvm/ADT/SmallPtrSet.h" + +namespace llvm { + class BasicBlock; + class Instruction; + class Value; +} + +namespace llvm { +namespace objcarc { + +class ProvenanceAnalysis; + +/// \enum DependenceKind +/// \brief Defines different dependence kinds among various ARC constructs. +/// +/// There are several kinds of dependence-like concepts in use here. +/// +enum DependenceKind { + NeedsPositiveRetainCount, + AutoreleasePoolBoundary, + CanChangeRetainCount, + RetainAutoreleaseDep, ///< Blocks objc_retainAutorelease. + RetainAutoreleaseRVDep, ///< Blocks objc_retainAutoreleaseReturnValue. + RetainRVDep ///< Blocks objc_retainAutoreleasedReturnValue. +}; + +void FindDependencies(DependenceKind Flavor, + const Value *Arg, + BasicBlock *StartBB, Instruction *StartInst, + SmallPtrSet<Instruction *, 4> &DependingInstructions, + SmallPtrSet<const BasicBlock *, 4> &Visited, + ProvenanceAnalysis &PA); + +bool +Depends(DependenceKind Flavor, Instruction *Inst, const Value *Arg, + ProvenanceAnalysis &PA); + +/// Test whether the given instruction can "use" the given pointer's object in a +/// way that requires the reference count to be positive. +bool +CanUse(const Instruction *Inst, const Value *Ptr, ProvenanceAnalysis &PA, + InstructionClass Class); + +/// Test whether the given instruction can result in a reference count +/// modification (positive or negative) for the pointer's object. +bool +CanAlterRefCount(const Instruction *Inst, const Value *Ptr, + ProvenanceAnalysis &PA, InstructionClass Class); + +} // namespace objcarc +} // namespace llvm + +#endif // LLVM_TRANSFORMS_OBJCARC_DEPEDENCYANALYSIS_H |