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e8d8bef961
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp to llvmorg-12-init-17869-g8e464dd76bef, the last commit before the upstream release/12.x branch was created. PR: 255570 MFC after: 6 weeks
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
//===- ObjCARCAnalysisUtils.cpp -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements common infrastructure for libLLVMObjCARCOpts.a, which
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// implements several scalar transformations over the LLVM intermediate
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// representation, including the C bindings for that library.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/ObjCARCAnalysisUtils.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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using namespace llvm::objcarc;
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/// A handy option to enable/disable all ARC Optimizations.
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bool llvm::objcarc::EnableARCOpts;
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static cl::opt<bool, true> EnableARCOptimizations(
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"enable-objc-arc-opts", cl::desc("enable/disable all ARC Optimizations"),
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cl::location(EnableARCOpts), cl::init(true), cl::Hidden);
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bool llvm::objcarc::IsPotentialRetainableObjPtr(const Value *Op,
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AAResults &AA) {
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// First make the rudimentary check.
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if (!IsPotentialRetainableObjPtr(Op))
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return false;
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// Objects in constant memory are not reference-counted.
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if (AA.pointsToConstantMemory(Op))
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return false;
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// Pointers in constant memory are not pointing to reference-counted objects.
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if (const LoadInst *LI = dyn_cast<LoadInst>(Op))
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if (AA.pointsToConstantMemory(LI->getPointerOperand()))
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return false;
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// Otherwise assume the worst.
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return true;
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}
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