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117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
//===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a simple N^2 alias analysis accuracy evaluator.
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// Basically, for each function in the program, it simply queries to see how the
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// alias analysis implementation answers alias queries between each pair of
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// pointers in the function.
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//
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// This is inspired and adapted from code by: Naveen Neelakantam, Francesco
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// Spadini, and Wojciech Stryjewski.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Pass.h"
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#include "llvm/Function.h"
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#include "llvm/Type.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Assembly/Writer.h"
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#include "Support/CommandLine.h"
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#include <set>
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namespace {
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cl::opt<bool> PrintNo ("print-no-aliases", cl::ReallyHidden);
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cl::opt<bool> PrintMay ("print-may-aliases", cl::ReallyHidden);
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cl::opt<bool> PrintMust("print-must-aliases", cl::ReallyHidden);
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class AAEval : public FunctionPass {
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unsigned No, May, Must;
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public:
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<AliasAnalysis>();
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AU.setPreservesAll();
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}
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bool doInitialization(Module &M) { No = May = Must = 0; return false; }
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bool runOnFunction(Function &F);
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bool doFinalization(Module &M);
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};
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RegisterOpt<AAEval>
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X("aa-eval", "Exhaustive Alias Analysis Precision Evaluator");
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}
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static inline void PrintResults(const char *Msg, bool P, Value *V1, Value *V2) {
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if (P) {
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std::cerr << " " << Msg << ":\t";
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WriteAsOperand(std::cerr, V1) << ", ";
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WriteAsOperand(std::cerr, V2) << "\n";
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}
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}
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bool AAEval::runOnFunction(Function &F) {
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AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
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std::set<Value *> Pointers;
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for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I)
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if (isa<PointerType>(I->getType())) // Add all pointer arguments
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Pointers.insert(I);
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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if (isa<PointerType>((*I)->getType())) // Add all pointer instructions
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Pointers.insert(*I);
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for (User::op_iterator OI = (*I)->op_begin(); OI != (*I)->op_end(); ++OI)
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if (isa<PointerType>((*OI)->getType()))
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Pointers.insert(*OI);
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}
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if (PrintNo || PrintMay || PrintMust)
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std::cerr << "Function: " << F.getName() << "\n";
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// iterate over the worklist, and run the full (n^2)/2 disambiguations
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for (std::set<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end();
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I1 != E; ++I1)
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for (std::set<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2)
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switch (AA.alias(*I1, 0, *I2, 0)) {
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case AliasAnalysis::NoAlias:
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PrintResults("No", PrintNo, *I1, *I2);
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++No; break;
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case AliasAnalysis::MayAlias:
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PrintResults("May", PrintMay, *I1, *I2);
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++May; break;
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case AliasAnalysis::MustAlias:
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PrintResults("Must", PrintMust, *I1, *I2);
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++Must; break;
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default:
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std::cerr << "Unknown alias query result!\n";
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}
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return false;
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}
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bool AAEval::doFinalization(Module &M) {
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unsigned Sum = No+May+Must;
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std::cerr << "===== Alias Analysis Evaluator Report =====\n";
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if (Sum == 0) {
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std::cerr << " Alias Analysis Evaluator Summary: No pointers!\n";
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return false;
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}
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std::cerr << " " << Sum << " Total Alias Queries Performed\n";
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std::cerr << " " << No << " no alias responses (" << No*100/Sum << "%)\n";
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std::cerr << " " << May << " may alias responses (" << May*100/Sum << "%)\n";
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std::cerr << " " << Must << " must alias responses (" <<Must*100/Sum<<"%)\n";
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std::cerr << " Alias Analysis Evaluator Summary: " << No*100/Sum << "%/"
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<< May*100/Sum << "%/" << Must*100/Sum<<"%\n";
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return false;
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}
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