1//===- ObjCARCAnalysisUtils.cpp -------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements common infrastructure for libLLVMObjCARCOpts.a, which
10// implements several scalar transformations over the LLVM intermediate
11// representation, including the C bindings for that library.
12//
13//===----------------------------------------------------------------------===//
14
15#include "llvm/Analysis/ObjCARCAnalysisUtils.h"
16#include "llvm/Analysis/AliasAnalysis.h"
17#include "llvm/Support/CommandLine.h"
18
19using namespace llvm;
20using namespace llvm::objcarc;
21
22/// A handy option to enable/disable all ARC Optimizations.
23bool llvm::objcarc::EnableARCOpts;
24static cl::opt<bool, true> EnableARCOptimizations(
25 "enable-objc-arc-opts", cl::desc("enable/disable all ARC Optimizations"),
26 cl::location(L&: EnableARCOpts), cl::init(Val: true), cl::Hidden);
27
28bool llvm::objcarc::IsPotentialRetainableObjPtr(const Value *Op,
29 AAResults &AA) {
30 // First make the rudimentary check.
31 if (!IsPotentialRetainableObjPtr(Op))
32 return false;
33
34 // Objects in constant memory are not reference-counted.
35 if (AA.pointsToConstantMemory(P: Op))
36 return false;
37
38 // Pointers in constant memory are not pointing to reference-counted objects.
39 if (const LoadInst *LI = dyn_cast<LoadInst>(Val: Op))
40 if (AA.pointsToConstantMemory(P: LI->getPointerOperand()))
41 return false;
42
43 // Otherwise assume the worst.
44 return true;
45}
46