DependencyAnalysis.cpp File Reference

This file defines special dependency analysis routines used in Objective C ARC Optimizations. More...

#include "DependencyAnalysis.h"
#include "ObjCARC.h"
#include "ProvenanceAnalysis.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/CFG.h"

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "objc-arc-dependency"

Functions
static bool	findDependencies (DependenceKind Flavor, const Value *Arg, BasicBlock *StartBB, Instruction *StartInst, SmallPtrSetImpl< Instruction * > &DependingInsts, ProvenanceAnalysis &PA)
	Walk up the CFG from StartPos (which is in StartBB) and find local and non-local dependencies on Arg.

Detailed Description

This file defines 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.

Definition in file DependencyAnalysis.cpp.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "objc-arc-dependency"

Definition at line 31 of file DependencyAnalysis.cpp.

Function Documentation

findDependencies()

bool findDependencies ( DependenceKind Flavor, const Value * Arg, BasicBlock * StartBB, Instruction * StartInst, SmallPtrSetImpl< Instruction * > & DependingInsts, ProvenanceAnalysis & PA )

static

Walk up the CFG from StartPos (which is in StartBB) and find local and non-local dependencies on Arg.

TODO: Cache results?

Definition at line 206 of file DependencyAnalysis.cpp.

References llvm::BasicBlock::begin(), llvm::SmallPtrSetImpl< PtrType >::count(), llvm::objcarc::Depends(), llvm::SmallVectorTemplateCommon< T, typename >::empty(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::SmallVectorImpl< T >::pop_back_val(), llvm::pred_empty(), llvm::predecessors(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::successors().

Referenced by llvm::objcarc::findSingleDependency().