1//===- ProvenanceAnalysisEvaluator.cpp - ObjC ARC Optimization ------------===//
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#include "ProvenanceAnalysis.h"
10#include "llvm/Transforms/ObjCARC.h"
11#include "llvm/ADT/SetVector.h"
12#include "llvm/Analysis/AliasAnalysis.h"
13#include "llvm/IR/Function.h"
14#include "llvm/IR/InstIterator.h"
15#include "llvm/Support/raw_ostream.h"
16
17using namespace llvm;
18using namespace llvm::objcarc;
19
20static StringRef getName(Value *V) {
21 StringRef Name = V->getName();
22 if (Name.starts_with(Prefix: "\1"))
23 return Name.substr(Start: 1);
24 return Name;
25}
26
27static void insertIfNamed(SetVector<Value *> &Values, Value *V) {
28 if (!V->hasName())
29 return;
30 if (!V->getType()->isPointerTy())
31 return;
32 Values.insert(X: V);
33}
34
35PreservedAnalyses PAEvalPass::run(Function &F, FunctionAnalysisManager &AM) {
36 SetVector<Value *> Values;
37
38 for (auto &Arg : F.args())
39 insertIfNamed(Values, V: &Arg);
40
41 for (Instruction &I : instructions(F)) {
42 insertIfNamed(Values, V: &I);
43
44 for (auto &Op : I.operands())
45 insertIfNamed(Values, V: Op);
46 }
47
48 ProvenanceAnalysis PA;
49 PA.setAA(&AM.getResult<AAManager>(IR&: F));
50
51 for (Value *V1 : Values) {
52 StringRef NameV1 = getName(V: V1);
53 for (Value *V2 : Values) {
54 StringRef NameV2 = getName(V: V2);
55 if (NameV1 >= NameV2)
56 continue;
57 errs() << NameV1 << " and " << NameV2;
58 if (PA.related(A: V1, B: V2))
59 errs() << " are related.\n";
60 else
61 errs() << " are not related.\n";
62 }
63 }
64
65 return PreservedAnalyses::all();
66}
67