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//===- 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/AliasAnalysisCounter.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#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);
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();
}
AliasResult AliasAnalysisCounter::alias(const MemoryLocation &LocA,
const MemoryLocation &LocB) {
AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB);
const char *AliasString = nullptr;
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;
}
ModRefInfo AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
const MemoryLocation &Loc) {
ModRefInfo R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
const char *MRString = nullptr;
switch (R) {
case MRI_NoModRef:
NoMR++;
MRString = "MRI_NoModRef";
break;
case MRI_Ref:
JustRef++;
MRString = "JustRef";
break;
case MRI_Mod:
JustMod++;
MRString = "JustMod";
break;
case MRI_ModRef:
MR++;
MRString = "MRI_ModRef";
break;
}
if (PrintAll || (PrintAllFailures && R == MRI_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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