//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and 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/AliasAnalysis.h"
+#include "llvm/Analysis/Passes.h"
#include "llvm/Pass.h"
-#include <iostream>
+#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Assembly/Writer.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Streams.h"
+using namespace llvm;
namespace {
- class AliasAnalysisCounter : public Pass, public AliasAnalysis {
+ cl::opt<bool>
+ PrintAll("count-aa-print-all-queries", cl::ReallyHidden);
+ cl::opt<bool>
+ PrintAllFailures("count-aa-print-all-failed-queries", cl::ReallyHidden);
+
+ class VISIBILITY_HIDDEN AliasAnalysisCounter
+ : public ModulePass, public AliasAnalysis {
unsigned No, May, Must;
unsigned NoMR, JustRef, JustMod, MR;
const char *Name;
+ Module *M;
public:
- AliasAnalysisCounter() {
+ static char ID; // Class identification, replacement for typeinfo
+ AliasAnalysisCounter() : ModulePass((intptr_t) &ID) {
No = May = Must = 0;
NoMR = JustRef = JustMod = MR = 0;
}
void printLine(const char *Desc, unsigned Val, unsigned Sum) {
- std::cerr << " " << Val << " " << Desc << " responses ("
- << Val*100/Sum << "%)\n";
+ cerr << " " << Val << " " << Desc << " responses ("
+ << Val*100/Sum << "%)\n";
}
~AliasAnalysisCounter() {
unsigned AASum = No+May+Must;
unsigned MRSum = NoMR+JustRef+JustMod+MR;
if (AASum + MRSum) { // Print a report if any counted queries occurred...
- std::cerr
- << "\n===== Alias Analysis Counter Report =====\n"
- << " Analysis counted: " << Name << "\n"
- << " " << AASum << " Total Alias Queries Performed\n";
+ cerr << "\n===== Alias Analysis Counter Report =====\n"
+ << " Analysis counted: " << Name << "\n"
+ << " " << AASum << " Total Alias Queries Performed\n";
if (AASum) {
printLine("no alias", No, AASum);
printLine("may alias", May, AASum);
printLine("must alias", Must, AASum);
- std::cerr
- << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
- << May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
+ cerr << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
+ << May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
}
- std::cerr
- << " " << MRSum << " Total Mod/Ref Queries Performed\n";
+ cerr << " " << 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);
- std::cerr
- << " Mod/Ref Analysis Counter Summary: " << NoMR*100/MRSum<< "%/"
- << JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
- << MR*100/MRSum <<"%\n\n";
+ cerr << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum<< "%/"
+ << JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
+ << MR*100/MRSum <<"%\n\n";
}
}
}
- bool run(Module &M) {
+ bool runOnModule(Module &M) {
+ this->M = &M;
InitializeAliasAnalysis(this);
Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
return false;
AU.setPreservesAll();
}
- AliasResult count(AliasResult R) {
- switch (R) {
- default: assert(0 && "Unknown alias type!");
- case NoAlias: No++; return NoAlias;
- case MayAlias: May++; return MayAlias;
- case MustAlias: Must++; return MustAlias;
- }
+ // FIXME: We could count these too...
+ bool pointsToConstantMemory(const Value *P) {
+ return getAnalysis<AliasAnalysis>().pointsToConstantMemory(P);
}
- ModRefResult count(ModRefResult R) {
- switch (R) {
- default: assert(0 && "Unknown mod/ref type!");
- case NoModRef: NoMR++; return NoModRef;
- case Ref: JustRef++; return Ref;
- case Mod: JustMod++; return Mod;
- case ModRef: MR++; return ModRef;
- }
+ bool doesNotAccessMemory(Function *F) {
+ return getAnalysis<AliasAnalysis>().doesNotAccessMemory(F);
+ }
+ bool onlyReadsMemory(Function *F) {
+ return getAnalysis<AliasAnalysis>().onlyReadsMemory(F);
}
-
+
+
// Forwarding functions: just delegate to a real AA implementation, counting
// the number of responses...
AliasResult alias(const Value *V1, unsigned V1Size,
- const Value *V2, unsigned V2Size) {
- return count(getAnalysis<AliasAnalysis>().alias(V1, V1Size, V2, V2Size));
- }
- ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
- return count(getAnalysis<AliasAnalysis>().getModRefInfo(CS, P, Size));
+ const Value *V2, unsigned V2Size);
+
+ ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size);
+ ModRefResult getModRefInfo(CallSite CS1, CallSite CS2) {
+ return AliasAnalysis::getModRefInfo(CS1,CS2);
}
};
- RegisterOpt<AliasAnalysisCounter>
+ char AliasAnalysisCounter::ID = 0;
+ RegisterPass<AliasAnalysisCounter>
X("count-aa", "Count Alias Analysis Query Responses");
- RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;
+ RegisterAnalysisGroup<AliasAnalysis> Y(X);
+}
+
+ModulePass *llvm::createAliasAnalysisCounterPass() {
+ return new AliasAnalysisCounter();
+}
+
+AliasAnalysis::AliasResult
+AliasAnalysisCounter::alias(const Value *V1, unsigned V1Size,
+ const Value *V2, unsigned V2Size) {
+ AliasResult R = getAnalysis<AliasAnalysis>().alias(V1, V1Size, V2, V2Size);
+
+ const char *AliasString;
+ switch (R) {
+ default: assert(0 && "Unknown alias type!");
+ case NoAlias: No++; AliasString = "No alias"; break;
+ case MayAlias: May++; AliasString = "May alias"; break;
+ case MustAlias: Must++; AliasString = "Must alias"; break;
+ }
+
+ if (PrintAll || (PrintAllFailures && R == MayAlias)) {
+ cerr << AliasString << ":\t";
+ cerr << "[" << V1Size << "B] ";
+ WriteAsOperand(*cerr.stream(), V1, true, M) << ", ";
+ cerr << "[" << V2Size << "B] ";
+ WriteAsOperand(*cerr.stream(), V2, true, M) << "\n";
+ }
+
+ return R;
+}
+
+AliasAnalysis::ModRefResult
+AliasAnalysisCounter::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
+ ModRefResult R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, P, Size);
+
+ const char *MRString;
+ switch (R) {
+ default: assert(0 && "Unknown mod/ref type!");
+ case NoModRef: NoMR++; MRString = "NoModRef"; break;
+ case Ref: JustRef++; MRString = "JustRef"; break;
+ case Mod: JustMod++; MRString = "JustMod"; break;
+ case ModRef: MR++; MRString = "ModRef"; break;
+ }
+
+ if (PrintAll || (PrintAllFailures && R == ModRef)) {
+ cerr << MRString << ": Ptr: ";
+ cerr << "[" << Size << "B] ";
+ WriteAsOperand(*cerr.stream(), P, true, M);
+ cerr << "\t<->" << *CS.getInstruction();
+ }
+ return R;
}
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