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all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- DependencyAnalysis.h - ObjC ARC Optimization ---*- 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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