llvm/lib/Transforms/ObjCARC/ProvenanceAnalysisEvaluator.cpp

   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 (auto I = inst_begin(F), E = inst_end(F); I != E; ++I) {
  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)