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111 lines
3.9 KiB
C++
111 lines
3.9 KiB
C++
//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
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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 pass which can be used to count how many alias queries
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// are being made and how the alias analysis implementation being used responds.
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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 <iostream>
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namespace {
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class AliasAnalysisCounter : public Pass, public AliasAnalysis {
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unsigned No, May, Must;
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unsigned NoMR, JustRef, JustMod, MR;
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const char *Name;
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public:
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AliasAnalysisCounter() {
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No = May = Must = 0;
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NoMR = JustRef = JustMod = MR = 0;
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}
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void printLine(const char *Desc, unsigned Val, unsigned Sum) {
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std::cerr << " " << Val << " " << Desc << " responses ("
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<< Val*100/Sum << "%)\n";
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}
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~AliasAnalysisCounter() {
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unsigned AASum = No+May+Must;
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unsigned MRSum = NoMR+JustRef+JustMod+MR;
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if (AASum + MRSum) { // Print a report if any counted queries occurred...
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std::cerr
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<< "\n===== Alias Analysis Counter Report =====\n"
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<< " Analysis counted: " << Name << "\n"
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<< " " << AASum << " Total Alias Queries Performed\n";
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if (AASum) {
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printLine("no alias", No, AASum);
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printLine("may alias", May, AASum);
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printLine("must alias", Must, AASum);
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std::cerr
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<< " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
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<< May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
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}
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std::cerr
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<< " " << MRSum << " Total Mod/Ref Queries Performed\n";
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if (MRSum) {
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printLine("no mod/ref", NoMR, MRSum);
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printLine("ref", JustRef, MRSum);
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printLine("mod", JustMod, MRSum);
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printLine("mod/ref", MR, MRSum);
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std::cerr
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<< " Mod/Ref Analysis Counter Summary: " << NoMR*100/MRSum<< "%/"
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<< JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
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<< MR*100/MRSum <<"%\n\n";
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}
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}
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}
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bool run(Module &M) {
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InitializeAliasAnalysis(this);
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Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
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return false;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AliasAnalysis::getAnalysisUsage(AU);
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AU.addRequired<AliasAnalysis>();
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AU.setPreservesAll();
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}
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AliasResult count(AliasResult R) {
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switch (R) {
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default: assert(0 && "Unknown alias type!");
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case NoAlias: No++; return NoAlias;
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case MayAlias: May++; return MayAlias;
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case MustAlias: Must++; return MustAlias;
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}
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}
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ModRefResult count(ModRefResult R) {
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switch (R) {
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default: assert(0 && "Unknown mod/ref type!");
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case NoModRef: NoMR++; return NoModRef;
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case Ref: JustRef++; return Ref;
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case Mod: JustMod++; return Mod;
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case ModRef: MR++; return ModRef;
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}
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}
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// Forwarding functions: just delegate to a real AA implementation, counting
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// the number of responses...
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AliasResult alias(const Value *V1, unsigned V1Size,
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const Value *V2, unsigned V2Size) {
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return count(getAnalysis<AliasAnalysis>().alias(V1, V1Size, V2, V2Size));
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}
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ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
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return count(getAnalysis<AliasAnalysis>().getModRefInfo(CS, P, Size));
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}
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};
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RegisterOpt<AliasAnalysisCounter>
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X("count-aa", "Count Alias Analysis Query Responses");
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RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;
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}
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