blob: d34a3c636362b8154fec254812c4ba6e4d33a3f8 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//===- 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;
}
|
