//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
// This file implements a pass which can be used to count how many alias queries
// are being made and how the alias analysis implementation being used responds.
//
//===----------------------------------------------------------------------===//
+#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Pass.h"
-#include <iostream>
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+static cl::opt<bool>
+PrintAll("count-aa-print-all-queries", cl::ReallyHidden, cl::init(true));
+static cl::opt<bool>
+PrintAllFailures("count-aa-print-all-failed-queries", cl::ReallyHidden);
namespace {
- class AliasAnalysisCounter : public Pass, public AliasAnalysis {
- unsigned No, May, Must;
- const char *Name;
+ class AliasAnalysisCounter : public ModulePass, public AliasAnalysis {
+ unsigned No, May, Partial, Must;
+ unsigned NoMR, JustRef, JustMod, MR;
+ Module *M;
public:
- AliasAnalysisCounter() : No(0), May(0), Must(0) {}
+ static char ID; // Class identification, replacement for typeinfo
+ AliasAnalysisCounter() : ModulePass(ID) {
+ initializeAliasAnalysisCounterPass(*PassRegistry::getPassRegistry());
+ No = May = Partial = Must = 0;
+ NoMR = JustRef = JustMod = MR = 0;
+ }
+
+ void printLine(const char *Desc, unsigned Val, unsigned Sum) {
+ errs() << " " << Val << " " << Desc << " responses ("
+ << Val*100/Sum << "%)\n";
+ }
~AliasAnalysisCounter() {
- unsigned Sum = No+May+Must;
- if (Sum) { // Print a report if any counted queries occurred...
- std::cerr
- << "\n===== Alias Analysis Counter Report =====\n"
- << " Analysis counted: " << Name << "\n"
- << " " << Sum << " Total Alias Queries Performed\n"
- << " " << No << " no alias responses (" << No*100/Sum << "%)\n"
- << " " << May << " may alias responses (" << May*100/Sum << "%)\n"
- << " " << Must << " must alias responses (" <<Must*100/Sum<<"%)\n"
- << " Alias Analysis Counter Summary: " << No*100/Sum << "%/"
- << May*100/Sum << "%/" << Must*100/Sum<<"%\n\n";
+ unsigned AASum = No+May+Partial+Must;
+ unsigned MRSum = NoMR+JustRef+JustMod+MR;
+ if (AASum + MRSum) { // Print a report if any counted queries occurred...
+ errs() << "\n===== Alias Analysis Counter Report =====\n"
+ << " Analysis counted:\n"
+ << " " << AASum << " Total Alias Queries Performed\n";
+ if (AASum) {
+ printLine("no alias", No, AASum);
+ printLine("may alias", May, AASum);
+ printLine("partial alias", Partial, AASum);
+ printLine("must alias", Must, AASum);
+ errs() << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
+ << May*100/AASum << "%/"
+ << Partial*100/AASum << "%/"
+ << Must*100/AASum<<"%\n\n";
+ }
+
+ errs() << " " << MRSum << " Total Mod/Ref Queries Performed\n";
+ if (MRSum) {
+ printLine("no mod/ref", NoMR, MRSum);
+ printLine("ref", JustRef, MRSum);
+ printLine("mod", JustMod, MRSum);
+ printLine("mod/ref", MR, MRSum);
+ errs() << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum
+ << "%/" << JustRef*100/MRSum << "%/" << JustMod*100/MRSum
+ << "%/" << MR*100/MRSum <<"%\n\n";
+ }
}
}
- bool run(Module &M) {
- Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
+ bool runOnModule(Module &M) {
+ this->M = &M;
+ InitializeAliasAnalysis(this);
return false;
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AliasAnalysis::getAnalysisUsage(AU);
AU.addRequired<AliasAnalysis>();
AU.setPreservesAll();
}
- Result count(Result R) {
- switch (R) {
- default: assert(0 && "Unknown alias type!");
- case NoAlias: No++; return NoAlias;
- case MayAlias: May++; return MayAlias;
- case MustAlias: Must++; return MustAlias;
- }
+ /// getAdjustedAnalysisPointer - This method is used when a pass implements
+ /// an analysis interface through multiple inheritance. If needed, it
+ /// should override this to adjust the this pointer as needed for the
+ /// specified pass info.
+ virtual void *getAdjustedAnalysisPointer(AnalysisID PI) {
+ if (PI == &AliasAnalysis::ID)
+ return (AliasAnalysis*)this;
+ return this;
}
+ // FIXME: We could count these too...
+ bool pointsToConstantMemory(const Location &Loc, bool OrLocal) {
+ return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal);
+ }
+
// Forwarding functions: just delegate to a real AA implementation, counting
// the number of responses...
- Result alias(const Value *V1, const Value *V2) {
- return count(getAnalysis<AliasAnalysis>().alias(V1, V2));
- }
- Result canCallModify(const CallInst &CI, const Value *Ptr) {
- return count(getAnalysis<AliasAnalysis>().canCallModify(CI, Ptr));
- }
- Result canInvokeModify(const InvokeInst &I, const Value *Ptr) {
- return count(getAnalysis<AliasAnalysis>().canInvokeModify(I, Ptr));
+ AliasResult alias(const Location &LocA, const Location &LocB);
+
+ ModRefResult getModRefInfo(ImmutableCallSite CS,
+ const Location &Loc);
+ ModRefResult getModRefInfo(ImmutableCallSite CS1,
+ ImmutableCallSite CS2) {
+ return AliasAnalysis::getModRefInfo(CS1,CS2);
}
};
+}
+
+char AliasAnalysisCounter::ID = 0;
+INITIALIZE_AG_PASS(AliasAnalysisCounter, AliasAnalysis, "count-aa",
+ "Count Alias Analysis Query Responses", false, true, false)
+
+ModulePass *llvm::createAliasAnalysisCounterPass() {
+ return new AliasAnalysisCounter();
+}
+
+AliasAnalysis::AliasResult
+AliasAnalysisCounter::alias(const Location &LocA, const Location &LocB) {
+ AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB);
+
+ const char *AliasString = 0;
+ switch (R) {
+ case NoAlias: No++; AliasString = "No alias"; break;
+ case MayAlias: May++; AliasString = "May alias"; break;
+ case PartialAlias: Partial++; AliasString = "Partial alias"; break;
+ case MustAlias: Must++; AliasString = "Must alias"; break;
+ }
+
+ if (PrintAll || (PrintAllFailures && R == MayAlias)) {
+ errs() << AliasString << ":\t";
+ errs() << "[" << LocA.Size << "B] ";
+ LocA.Ptr->printAsOperand(errs(), true, M);
+ errs() << ", ";
+ errs() << "[" << LocB.Size << "B] ";
+ LocB.Ptr->printAsOperand(errs(), true, M);
+ errs() << "\n";
+ }
+
+ return R;
+}
+
+AliasAnalysis::ModRefResult
+AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
+ const Location &Loc) {
+ ModRefResult R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
+
+ const char *MRString = 0;
+ switch (R) {
+ case NoModRef: NoMR++; MRString = "NoModRef"; break;
+ case Ref: JustRef++; MRString = "JustRef"; break;
+ case Mod: JustMod++; MRString = "JustMod"; break;
+ case ModRef: MR++; MRString = "ModRef"; break;
+ }
- RegisterOpt<AliasAnalysisCounter>
- X("count-aa", "Count Alias Analysis Query Responses");
- RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;
+ if (PrintAll || (PrintAllFailures && R == ModRef)) {
+ errs() << MRString << ": Ptr: ";
+ errs() << "[" << Loc.Size << "B] ";
+ Loc.Ptr->printAsOperand(errs(), true, M);
+ errs() << "\t<->" << *CS.getInstruction() << '\n';
+ }
+ return R;
}
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