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llvm-project/llvm/lib/Analysis/AliasAnalysisEvaluator.cpp

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//===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/AliasAnalysisEvaluator.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static cl::opt<bool> PrintAll("print-all-alias-modref-info", cl::ReallyHidden);
static cl::opt<bool> PrintNoAlias("print-no-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintMayAlias("print-may-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintPartialAlias("print-partial-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintMustAlias("print-must-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintNoModRef("print-no-modref", cl::ReallyHidden);
static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden);
static cl::opt<bool> PrintMod("print-mod", cl::ReallyHidden);
static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
static cl::opt<bool> PrintMust("print-must", cl::ReallyHidden);
static cl::opt<bool> PrintMustRef("print-mustref", cl::ReallyHidden);
static cl::opt<bool> PrintMustMod("print-mustmod", cl::ReallyHidden);
static cl::opt<bool> PrintMustModRef("print-mustmodref", cl::ReallyHidden);
static cl::opt<bool> EvalAAMD("evaluate-aa-metadata", cl::ReallyHidden);
static void PrintResults(AliasResult AR, bool P,
std::pair<const Value *, Type *> Loc1,
std::pair<const Value *, Type *> Loc2,
const Module *M) {
if (PrintAll || P) {
Type *Ty1 = Loc1.second, *Ty2 = Loc2.second;
unsigned AS1 = Loc1.first->getType()->getPointerAddressSpace();
unsigned AS2 = Loc2.first->getType()->getPointerAddressSpace();
std::string o1, o2;
{
raw_string_ostream os1(o1), os2(o2);
Loc1.first->printAsOperand(os1, false, M);
Loc2.first->printAsOperand(os2, false, M);
}
if (o2 < o1) {
std::swap(o1, o2);
std::swap(Ty1, Ty2);
std::swap(AS1, AS2);
// Change offset sign for the local AR, for printing only.
AR.swap();
}
errs() << " " << AR << ":\t";
Ty1->print(errs(), false, /* NoDetails */ true);
if (AS1 != 0)
errs() << " addrspace(" << AS1 << ")";
errs() << "* " << o1 << ", ";
Ty2->print(errs(), false, /* NoDetails */ true);
if (AS2 != 0)
errs() << " addrspace(" << AS2 << ")";
errs() << "* " << o2 << "\n";
}
}
static inline void PrintModRefResults(
const char *Msg, bool P, Instruction *I,
std::pair<const Value *, Type *> Loc, Module *M) {
if (PrintAll || P) {
errs() << " " << Msg << ": Ptr: ";
Loc.second->print(errs(), false, /* NoDetails */ true);
errs() << "* ";
Loc.first->printAsOperand(errs(), false, M);
errs() << "\t<->" << *I << '\n';
}
}
static inline void PrintModRefResults(const char *Msg, bool P, CallBase *CallA,
CallBase *CallB, Module *M) {
if (PrintAll || P) {
errs() << " " << Msg << ": " << *CallA << " <-> " << *CallB << '\n';
}
}
static inline void PrintLoadStoreResults(AliasResult AR, bool P,
const Value *V1, const Value *V2,
const Module *M) {
if (PrintAll || P) {
errs() << " " << AR << ": " << *V1 << " <-> " << *V2 << '\n';
}
}
PreservedAnalyses AAEvaluator::run(Function &F, FunctionAnalysisManager &AM) {
runInternal(F, AM.getResult<AAManager>(F));
return PreservedAnalyses::all();
}
void AAEvaluator::runInternal(Function &F, AAResults &AA) {
const DataLayout &DL = F.getParent()->getDataLayout();
++FunctionCount;
SetVector<std::pair<const Value *, Type *>> Pointers;
SmallSetVector<CallBase *, 16> Calls;
SetVector<Value *> Loads;
SetVector<Value *> Stores;
for (Instruction &Inst : instructions(F)) {
if (auto *LI = dyn_cast<LoadInst>(&Inst)) {
Pointers.insert({LI->getPointerOperand(), LI->getType()});
Loads.insert(LI);
} else if (auto *SI = dyn_cast<StoreInst>(&Inst)) {
Pointers.insert({SI->getPointerOperand(),
SI->getValueOperand()->getType()});
Stores.insert(SI);
} else if (auto *CB = dyn_cast<CallBase>(&Inst))
Calls.insert(CB);
}
if (PrintAll || PrintNoAlias || PrintMayAlias || PrintPartialAlias ||
PrintMustAlias || PrintNoModRef || PrintMod || PrintRef || PrintModRef)
errs() << "Function: " << F.getName() << ": " << Pointers.size()
<< " pointers, " << Calls.size() << " call sites\n";
// iterate over the worklist, and run the full (n^2)/2 disambiguations
for (auto I1 = Pointers.begin(), E = Pointers.end(); I1 != E; ++I1) {
LocationSize Size1 = LocationSize::precise(DL.getTypeStoreSize(I1->second));
for (auto I2 = Pointers.begin(); I2 != I1; ++I2) {
LocationSize Size2 =
LocationSize::precise(DL.getTypeStoreSize(I2->second));
AliasResult AR = AA.alias(I1->first, Size1, I2->first, Size2);
switch (AR) {
case AliasResult::NoAlias:
PrintResults(AR, PrintNoAlias, *I1, *I2, F.getParent());
++NoAliasCount;
break;
case AliasResult::MayAlias:
PrintResults(AR, PrintMayAlias, *I1, *I2, F.getParent());
++MayAliasCount;
break;
case AliasResult::PartialAlias:
PrintResults(AR, PrintPartialAlias, *I1, *I2, F.getParent());
++PartialAliasCount;
break;
case AliasResult::MustAlias:
PrintResults(AR, PrintMustAlias, *I1, *I2, F.getParent());
++MustAliasCount;
break;
}
}
}
if (EvalAAMD) {
// iterate over all pairs of load, store
for (Value *Load : Loads) {
for (Value *Store : Stores) {
AliasResult AR = AA.alias(MemoryLocation::get(cast<LoadInst>(Load)),
MemoryLocation::get(cast<StoreInst>(Store)));
switch (AR) {
case AliasResult::NoAlias:
PrintLoadStoreResults(AR, PrintNoAlias, Load, Store, F.getParent());
++NoAliasCount;
break;
case AliasResult::MayAlias:
PrintLoadStoreResults(AR, PrintMayAlias, Load, Store, F.getParent());
++MayAliasCount;
break;
case AliasResult::PartialAlias:
PrintLoadStoreResults(AR, PrintPartialAlias, Load, Store, F.getParent());
++PartialAliasCount;
break;
case AliasResult::MustAlias:
PrintLoadStoreResults(AR, PrintMustAlias, Load, Store, F.getParent());
++MustAliasCount;
break;
}
}
}
// iterate over all pairs of store, store
for (SetVector<Value *>::iterator I1 = Stores.begin(), E = Stores.end();
I1 != E; ++I1) {
for (SetVector<Value *>::iterator I2 = Stores.begin(); I2 != I1; ++I2) {
AliasResult AR = AA.alias(MemoryLocation::get(cast<StoreInst>(*I1)),
MemoryLocation::get(cast<StoreInst>(*I2)));
switch (AR) {
case AliasResult::NoAlias:
PrintLoadStoreResults(AR, PrintNoAlias, *I1, *I2, F.getParent());
++NoAliasCount;
break;
case AliasResult::MayAlias:
PrintLoadStoreResults(AR, PrintMayAlias, *I1, *I2, F.getParent());
++MayAliasCount;
break;
case AliasResult::PartialAlias:
PrintLoadStoreResults(AR, PrintPartialAlias, *I1, *I2, F.getParent());
++PartialAliasCount;
break;
case AliasResult::MustAlias:
PrintLoadStoreResults(AR, PrintMustAlias, *I1, *I2, F.getParent());
++MustAliasCount;
break;
}
}
}
}
// Mod/ref alias analysis: compare all pairs of calls and values
for (CallBase *Call : Calls) {
for (const auto &Pointer : Pointers) {
LocationSize Size =
LocationSize::precise(DL.getTypeStoreSize(Pointer.second));
switch (AA.getModRefInfo(Call, Pointer.first, Size)) {
case ModRefInfo::NoModRef:
PrintModRefResults("NoModRef", PrintNoModRef, Call, Pointer,
F.getParent());
++NoModRefCount;
break;
case ModRefInfo::Mod:
PrintModRefResults("Just Mod", PrintMod, Call, Pointer, F.getParent());
++ModCount;
break;
case ModRefInfo::Ref:
PrintModRefResults("Just Ref", PrintRef, Call, Pointer, F.getParent());
++RefCount;
break;
case ModRefInfo::ModRef:
PrintModRefResults("Both ModRef", PrintModRef, Call, Pointer,
F.getParent());
++ModRefCount;
break;
case ModRefInfo::Must:
PrintModRefResults("Must", PrintMust, Call, Pointer, F.getParent());
++MustCount;
break;
case ModRefInfo::MustMod:
PrintModRefResults("Just Mod (MustAlias)", PrintMustMod, Call, Pointer,
F.getParent());
++MustModCount;
break;
case ModRefInfo::MustRef:
PrintModRefResults("Just Ref (MustAlias)", PrintMustRef, Call, Pointer,
F.getParent());
++MustRefCount;
break;
case ModRefInfo::MustModRef:
PrintModRefResults("Both ModRef (MustAlias)", PrintMustModRef, Call,
Pointer, F.getParent());
++MustModRefCount;
break;
}
}
}
// Mod/ref alias analysis: compare all pairs of calls
for (CallBase *CallA : Calls) {
for (CallBase *CallB : Calls) {
if (CallA == CallB)
continue;
switch (AA.getModRefInfo(CallA, CallB)) {
case ModRefInfo::NoModRef:
PrintModRefResults("NoModRef", PrintNoModRef, CallA, CallB,
F.getParent());
++NoModRefCount;
break;
case ModRefInfo::Mod:
PrintModRefResults("Just Mod", PrintMod, CallA, CallB, F.getParent());
++ModCount;
break;
case ModRefInfo::Ref:
PrintModRefResults("Just Ref", PrintRef, CallA, CallB, F.getParent());
++RefCount;
break;
case ModRefInfo::ModRef:
PrintModRefResults("Both ModRef", PrintModRef, CallA, CallB,
F.getParent());
++ModRefCount;
break;
case ModRefInfo::Must:
PrintModRefResults("Must", PrintMust, CallA, CallB, F.getParent());
++MustCount;
break;
case ModRefInfo::MustMod:
PrintModRefResults("Just Mod (MustAlias)", PrintMustMod, CallA, CallB,
F.getParent());
++MustModCount;
break;
case ModRefInfo::MustRef:
PrintModRefResults("Just Ref (MustAlias)", PrintMustRef, CallA, CallB,
F.getParent());
++MustRefCount;
break;
case ModRefInfo::MustModRef:
PrintModRefResults("Both ModRef (MustAlias)", PrintMustModRef, CallA,
CallB, F.getParent());
++MustModRefCount;
break;
}
}
}
}
static void PrintPercent(int64_t Num, int64_t Sum) {
errs() << "(" << Num * 100LL / Sum << "." << ((Num * 1000LL / Sum) % 10)
<< "%)\n";
}
AAEvaluator::~AAEvaluator() {
if (FunctionCount == 0)
return;
int64_t AliasSum =
NoAliasCount + MayAliasCount + PartialAliasCount + MustAliasCount;
errs() << "===== Alias Analysis Evaluator Report =====\n";
if (AliasSum == 0) {
errs() << " Alias Analysis Evaluator Summary: No pointers!\n";
} else {
errs() << " " << AliasSum << " Total Alias Queries Performed\n";
errs() << " " << NoAliasCount << " no alias responses ";
PrintPercent(NoAliasCount, AliasSum);
errs() << " " << MayAliasCount << " may alias responses ";
PrintPercent(MayAliasCount, AliasSum);
errs() << " " << PartialAliasCount << " partial alias responses ";
PrintPercent(PartialAliasCount, AliasSum);
errs() << " " << MustAliasCount << " must alias responses ";
PrintPercent(MustAliasCount, AliasSum);
errs() << " Alias Analysis Evaluator Pointer Alias Summary: "
<< NoAliasCount * 100 / AliasSum << "%/"
<< MayAliasCount * 100 / AliasSum << "%/"
<< PartialAliasCount * 100 / AliasSum << "%/"
<< MustAliasCount * 100 / AliasSum << "%\n";
}
// Display the summary for mod/ref analysis
int64_t ModRefSum = NoModRefCount + RefCount + ModCount + ModRefCount +
MustCount + MustRefCount + MustModCount + MustModRefCount;
if (ModRefSum == 0) {
errs() << " Alias Analysis Mod/Ref Evaluator Summary: no "
"mod/ref!\n";
} else {
errs() << " " << ModRefSum << " Total ModRef Queries Performed\n";
errs() << " " << NoModRefCount << " no mod/ref responses ";
PrintPercent(NoModRefCount, ModRefSum);
errs() << " " << ModCount << " mod responses ";
PrintPercent(ModCount, ModRefSum);
errs() << " " << RefCount << " ref responses ";
PrintPercent(RefCount, ModRefSum);
errs() << " " << ModRefCount << " mod & ref responses ";
PrintPercent(ModRefCount, ModRefSum);
errs() << " " << MustCount << " must responses ";
PrintPercent(MustCount, ModRefSum);
errs() << " " << MustModCount << " must mod responses ";
PrintPercent(MustModCount, ModRefSum);
errs() << " " << MustRefCount << " must ref responses ";
PrintPercent(MustRefCount, ModRefSum);
errs() << " " << MustModRefCount << " must mod & ref responses ";
PrintPercent(MustModRefCount, ModRefSum);
errs() << " Alias Analysis Evaluator Mod/Ref Summary: "
<< NoModRefCount * 100 / ModRefSum << "%/"
<< ModCount * 100 / ModRefSum << "%/" << RefCount * 100 / ModRefSum
<< "%/" << ModRefCount * 100 / ModRefSum << "%/"
<< MustCount * 100 / ModRefSum << "%/"
<< MustRefCount * 100 / ModRefSum << "%/"
<< MustModCount * 100 / ModRefSum << "%/"
<< MustModRefCount * 100 / ModRefSum << "%\n";
}
}
namespace llvm {
class AAEvalLegacyPass : public FunctionPass {
std::unique_ptr<AAEvaluator> P;
public:
static char ID; // Pass identification, replacement for typeid
AAEvalLegacyPass() : FunctionPass(ID) {
initializeAAEvalLegacyPassPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<AAResultsWrapperPass>();
AU.setPreservesAll();
}
bool doInitialization(Module &M) override {
P.reset(new AAEvaluator());
return false;
}
bool runOnFunction(Function &F) override {
P->runInternal(F, getAnalysis<AAResultsWrapperPass>().getAAResults());
return false;
}
bool doFinalization(Module &M) override {
P.reset();
return false;
}
};
}
char AAEvalLegacyPass::ID = 0;
INITIALIZE_PASS_BEGIN(AAEvalLegacyPass, "aa-eval",
"Exhaustive Alias Analysis Precision Evaluator", false,
true)
INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
INITIALIZE_PASS_END(AAEvalLegacyPass, "aa-eval",
"Exhaustive Alias Analysis Precision Evaluator", false,
true)
FunctionPass *llvm::createAAEvalPass() { return new AAEvalLegacyPass(); }
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