ObjCARCAPElim.cpp File Reference

This file defines ObjC ARC optimizations. More...

#include "ObjCARC.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Constants.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

Include dependency graph for ObjCARCAPElim.cpp:

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Macros
#define	DEBUG_TYPE   "objc-arc-ap-elim"

Functions
	INITIALIZE_PASS (ObjCARCAPElim, "objc-arc-apelim", "ObjC ARC autorelease pool elimination", false, false) Pass *llvm

Detailed Description

This file defines ObjC ARC optimizations.

ARC stands for Automatic Reference Counting and is a system for managing reference counts for objects in Objective C.

This specific file implements optimizations which remove extraneous autorelease pools.

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 ObjCARCAPElim.cpp.

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "objc-arc-ap-elim"

Definition at line 36 of file ObjCARCAPElim.cpp.

Function Documentation

INITIALIZE_PASS()

INITIALIZE_PASS	(	ObjCARCAPElim	,
		"objc-arc-apelim"	,
		"ObjC ARC autorelease pool elimination"	,
		false	,
		false
	)

Definition at line 56 of file ObjCARCAPElim.cpp.

References assert(), llvm::objcarc::AutoreleasepoolPop, llvm::objcarc::AutoreleasepoolPush, llvm::BasicBlock::begin(), llvm::Function::begin(), Callee, llvm::objcarc::CallOrUser, llvm::dbgs(), llvm::Depth, llvm::dyn_cast(), E, llvm::objcarc::EnableARCOpts, llvm::BasicBlock::end(), llvm::Function::end(), llvm::Instruction::eraseFromParent(), F(), llvm::Function::front(), llvm::objcarc::GetBasicARCInstKind(), llvm::CallSiteBase< FunTy, BBTy, ValTy, UserTy, UseTy, InstrTy, CallTy, InvokeTy, IterTy >::getCalledFunction(), llvm::Module::getGlobalVariable(), llvm::GlobalVariable::getInitializer(), llvm::GlobalVariable::hasDefinitiveInitializer(), I, llvm::GlobalValue::isDeclaration(), LLVM_DEBUG, llvm::objcarc::ModuleHasARC(), llvm::User::op_begin(), llvm::User::op_end(), and llvm::AnalysisUsage::setPreservesCFG().