//===- 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 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
#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 ModulePass, public AliasAnalysis {
- unsigned No, May, Must;
+ unsigned No, May, Partial, Must;
unsigned NoMR, JustRef, JustMod, MR;
- const char *Name;
+ Module *M;
public:
- AliasAnalysisCounter() {
- No = May = 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) {
- std::cerr << " " << Val << " " << Desc << " responses ("
- << Val*100/Sum << "%)\n";
+ errs() << " " << Val << " " << Desc << " responses ("
+ << Val*100/Sum << "%)\n";
}
~AliasAnalysisCounter() {
- unsigned AASum = No+May+Must;
+ unsigned AASum = No+May+Partial+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";
+ 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);
- std::cerr
- << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
- << May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
+ errs() << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
+ << May*100/AASum << "%/"
+ << Partial*100/AASum << "%/"
+ << Must*100/AASum<<"%\n\n";
}
- std::cerr
- << " " << MRSum << " Total Mod/Ref Queries Performed\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);
- std::cerr
- << " Mod/Ref Analysis Counter Summary: " << NoMR*100/MRSum<< "%/"
- << JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
- << MR*100/MRSum <<"%\n\n";
+ errs() << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum
+ << "%/" << JustRef*100/MRSum << "%/" << JustMod*100/MRSum
+ << "%/" << MR*100/MRSum <<"%\n\n";
}
}
}
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;
- }
+ /// 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;
}
- 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;
- }
- }
-
+
// FIXME: We could count these too...
- bool pointsToConstantMemory(const Value *P) {
- return getAnalysis<AliasAnalysis>().pointsToConstantMemory(P);
- }
- bool doesNotAccessMemory(Function *F) {
- return getAnalysis<AliasAnalysis>().doesNotAccessMemory(F);
+ bool pointsToConstantMemory(const Location &Loc, bool OrLocal) {
+ return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal);
}
- 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));
- }
- ModRefResult getModRefInfo(CallSite CS1, CallSite CS2) {
+ 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);
}
};
-
- RegisterOpt<AliasAnalysisCounter>
- X("count-aa", "Count Alias Analysis Query Responses");
- RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;
}
+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;
+ }
+
+ 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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