xref: /freebsd/contrib/llvm-project/llvm/lib/Transforms/ObjCARC/ProvenanceAnalysisEvaluator.cpp (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5)
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/ADT/SetVector.h"
11 #include "llvm/Analysis/AliasAnalysis.h"
12 #include "llvm/Analysis/Passes.h"
13 #include "llvm/IR/Function.h"
14 #include "llvm/IR/InstIterator.h"
15 #include "llvm/IR/InstrTypes.h"
16 #include "llvm/IR/Module.h"
17 #include "llvm/InitializePasses.h"
18 #include "llvm/Pass.h"
19 #include "llvm/Support/raw_ostream.h"
20 
21 using namespace llvm;
22 using namespace llvm::objcarc;
23 
24 namespace {
25 class PAEval : public FunctionPass {
26 
27 public:
28   static char ID;
29   PAEval();
30   void getAnalysisUsage(AnalysisUsage &AU) const override;
31   bool runOnFunction(Function &F) override;
32 };
33 }
34 
35 char PAEval::ID = 0;
36 PAEval::PAEval() : FunctionPass(ID) {}
37 
38 void PAEval::getAnalysisUsage(AnalysisUsage &AU) const {
39   AU.addRequired<AAResultsWrapperPass>();
40 }
41 
42 static StringRef getName(Value *V) {
43   StringRef Name = V->getName();
44   if (Name.startswith("\1"))
45     return Name.substr(1);
46   return Name;
47 }
48 
49 static void insertIfNamed(SetVector<Value *> &Values, Value *V) {
50   if (!V->hasName())
51     return;
52   Values.insert(V);
53 }
54 
55 bool PAEval::runOnFunction(Function &F) {
56   SetVector<Value *> Values;
57 
58   for (auto &Arg : F.args())
59     insertIfNamed(Values, &Arg);
60 
61   for (Instruction &I : instructions(F)) {
62     insertIfNamed(Values, &I);
63 
64     for (auto &Op : I.operands())
65       insertIfNamed(Values, Op);
66   }
67 
68   ProvenanceAnalysis PA;
69   PA.setAA(&getAnalysis<AAResultsWrapperPass>().getAAResults());
70 
71   for (Value *V1 : Values) {
72     StringRef NameV1 = getName(V1);
73     for (Value *V2 : Values) {
74       StringRef NameV2 = getName(V2);
75       if (NameV1 >= NameV2)
76         continue;
77       errs() << NameV1 << " and " << NameV2;
78       if (PA.related(V1, V2))
79         errs() << " are related.\n";
80       else
81         errs() << " are not related.\n";
82     }
83   }
84 
85   return false;
86 }
87 
88 FunctionPass *llvm::createPAEvalPass() { return new PAEval(); }
89 
90 INITIALIZE_PASS_BEGIN(PAEval, "pa-eval",
91                       "Evaluate ProvenanceAnalysis on all pairs", false, true)
92 INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
93 INITIALIZE_PASS_END(PAEval, "pa-eval",
94                     "Evaluate ProvenanceAnalysis on all pairs", false, true)
95