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//===- ObjCARCAnalysisUtils.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements common infrastructure for libLLVMObjCARCOpts.a, which
// implements several scalar transformations over the LLVM intermediate
// representation, including the C bindings for that library.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/ObjCARCAnalysisUtils.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
using namespace llvm::objcarc;
/// A handy option to enable/disable all ARC Optimizations.
bool llvm::objcarc::EnableARCOpts;
static cl::opt<bool, true> EnableARCOptimizations(
"enable-objc-arc-opts", cl::desc("enable/disable all ARC Optimizations"),
cl::location(EnableARCOpts), cl::init(true), cl::Hidden);
bool llvm::objcarc::IsPotentialRetainableObjPtr(const Value *Op,
AAResults &AA) {
// First make the rudimentary check.
if (!IsPotentialRetainableObjPtr(Op))
return false;
// Objects in constant memory are not reference-counted.
if (AA.pointsToConstantMemory(Op))
return false;
// Pointers in constant memory are not pointing to reference-counted objects.
if (const LoadInst *LI = dyn_cast<LoadInst>(Op))
if (AA.pointsToConstantMemory(LI->getPointerOperand()))
return false;
// Otherwise assume the worst.
return true;
}
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