436 lines
16 KiB
C++
436 lines
16 KiB
C++
//===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/AliasAnalysisEvaluator.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static cl::opt<bool> PrintAll("print-all-alias-modref-info", cl::ReallyHidden);
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static cl::opt<bool> PrintNoAlias("print-no-aliases", cl::ReallyHidden);
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static cl::opt<bool> PrintMayAlias("print-may-aliases", cl::ReallyHidden);
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static cl::opt<bool> PrintPartialAlias("print-partial-aliases", cl::ReallyHidden);
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static cl::opt<bool> PrintMustAlias("print-must-aliases", cl::ReallyHidden);
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static cl::opt<bool> PrintNoModRef("print-no-modref", cl::ReallyHidden);
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static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden);
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static cl::opt<bool> PrintMod("print-mod", cl::ReallyHidden);
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static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
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static cl::opt<bool> PrintMust("print-must", cl::ReallyHidden);
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static cl::opt<bool> PrintMustRef("print-mustref", cl::ReallyHidden);
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static cl::opt<bool> PrintMustMod("print-mustmod", cl::ReallyHidden);
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static cl::opt<bool> PrintMustModRef("print-mustmodref", cl::ReallyHidden);
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static cl::opt<bool> EvalAAMD("evaluate-aa-metadata", cl::ReallyHidden);
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static void PrintResults(AliasResult AR, bool P, const Value *V1,
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const Value *V2, const Module *M) {
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if (PrintAll || P) {
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std::string o1, o2;
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{
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raw_string_ostream os1(o1), os2(o2);
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V1->printAsOperand(os1, true, M);
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V2->printAsOperand(os2, true, M);
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}
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if (o2 < o1)
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std::swap(o1, o2);
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errs() << " " << AR << ":\t" << o1 << ", " << o2 << "\n";
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}
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}
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static inline void PrintModRefResults(const char *Msg, bool P, Instruction *I,
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Value *Ptr, Module *M) {
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if (PrintAll || P) {
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errs() << " " << Msg << ": Ptr: ";
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Ptr->printAsOperand(errs(), true, M);
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errs() << "\t<->" << *I << '\n';
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}
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}
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static inline void PrintModRefResults(const char *Msg, bool P, CallBase *CallA,
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CallBase *CallB, Module *M) {
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if (PrintAll || P) {
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errs() << " " << Msg << ": " << *CallA << " <-> " << *CallB << '\n';
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}
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}
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static inline void PrintLoadStoreResults(AliasResult AR, bool P,
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const Value *V1, const Value *V2,
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const Module *M) {
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if (PrintAll || P) {
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errs() << " " << AR << ": " << *V1 << " <-> " << *V2 << '\n';
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}
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}
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static inline bool isInterestingPointer(Value *V) {
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return V->getType()->isPointerTy()
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&& !isa<ConstantPointerNull>(V);
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}
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PreservedAnalyses AAEvaluator::run(Function &F, FunctionAnalysisManager &AM) {
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runInternal(F, AM.getResult<AAManager>(F));
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return PreservedAnalyses::all();
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}
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void AAEvaluator::runInternal(Function &F, AAResults &AA) {
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const DataLayout &DL = F.getParent()->getDataLayout();
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++FunctionCount;
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SetVector<Value *> Pointers;
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SmallSetVector<CallBase *, 16> Calls;
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SetVector<Value *> Loads;
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SetVector<Value *> Stores;
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for (auto &I : F.args())
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if (I.getType()->isPointerTy()) // Add all pointer arguments.
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Pointers.insert(&I);
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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if (I->getType()->isPointerTy()) // Add all pointer instructions.
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Pointers.insert(&*I);
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if (EvalAAMD && isa<LoadInst>(&*I))
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Loads.insert(&*I);
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if (EvalAAMD && isa<StoreInst>(&*I))
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Stores.insert(&*I);
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Instruction &Inst = *I;
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if (auto *Call = dyn_cast<CallBase>(&Inst)) {
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Value *Callee = Call->getCalledOperand();
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// Skip actual functions for direct function calls.
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if (!isa<Function>(Callee) && isInterestingPointer(Callee))
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Pointers.insert(Callee);
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// Consider formals.
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for (Use &DataOp : Call->data_ops())
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if (isInterestingPointer(DataOp))
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Pointers.insert(DataOp);
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Calls.insert(Call);
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} else {
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// Consider all operands.
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for (Instruction::op_iterator OI = Inst.op_begin(), OE = Inst.op_end();
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OI != OE; ++OI)
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if (isInterestingPointer(*OI))
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Pointers.insert(*OI);
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}
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}
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if (PrintAll || PrintNoAlias || PrintMayAlias || PrintPartialAlias ||
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PrintMustAlias || PrintNoModRef || PrintMod || PrintRef || PrintModRef)
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errs() << "Function: " << F.getName() << ": " << Pointers.size()
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<< " pointers, " << Calls.size() << " call sites\n";
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// iterate over the worklist, and run the full (n^2)/2 disambiguations
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for (SetVector<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end();
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I1 != E; ++I1) {
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auto I1Size = LocationSize::afterPointer();
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Type *I1ElTy = cast<PointerType>((*I1)->getType())->getElementType();
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if (I1ElTy->isSized())
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I1Size = LocationSize::precise(DL.getTypeStoreSize(I1ElTy));
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for (SetVector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) {
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auto I2Size = LocationSize::afterPointer();
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Type *I2ElTy = cast<PointerType>((*I2)->getType())->getElementType();
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if (I2ElTy->isSized())
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I2Size = LocationSize::precise(DL.getTypeStoreSize(I2ElTy));
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AliasResult AR = AA.alias(*I1, I1Size, *I2, I2Size);
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switch (AR) {
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case NoAlias:
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PrintResults(AR, PrintNoAlias, *I1, *I2, F.getParent());
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++NoAliasCount;
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break;
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case MayAlias:
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PrintResults(AR, PrintMayAlias, *I1, *I2, F.getParent());
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++MayAliasCount;
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break;
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case PartialAlias:
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PrintResults(AR, PrintPartialAlias, *I1, *I2, F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintResults(AR, PrintMustAlias, *I1, *I2, F.getParent());
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++MustAliasCount;
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break;
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}
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}
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}
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if (EvalAAMD) {
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// iterate over all pairs of load, store
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for (Value *Load : Loads) {
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for (Value *Store : Stores) {
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AliasResult AR = AA.alias(MemoryLocation::get(cast<LoadInst>(Load)),
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MemoryLocation::get(cast<StoreInst>(Store)));
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switch (AR) {
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case NoAlias:
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PrintLoadStoreResults(AR, PrintNoAlias, Load, Store, F.getParent());
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++NoAliasCount;
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break;
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case MayAlias:
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PrintLoadStoreResults(AR, PrintMayAlias, Load, Store, F.getParent());
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++MayAliasCount;
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break;
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case PartialAlias:
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PrintLoadStoreResults(AR, PrintPartialAlias, Load, Store, F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintLoadStoreResults(AR, PrintMustAlias, Load, Store, F.getParent());
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++MustAliasCount;
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break;
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}
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}
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}
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// iterate over all pairs of store, store
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for (SetVector<Value *>::iterator I1 = Stores.begin(), E = Stores.end();
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I1 != E; ++I1) {
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for (SetVector<Value *>::iterator I2 = Stores.begin(); I2 != I1; ++I2) {
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AliasResult AR = AA.alias(MemoryLocation::get(cast<StoreInst>(*I1)),
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MemoryLocation::get(cast<StoreInst>(*I2)));
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switch (AR) {
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case NoAlias:
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PrintLoadStoreResults(AR, PrintNoAlias, *I1, *I2, F.getParent());
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++NoAliasCount;
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break;
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case MayAlias:
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PrintLoadStoreResults(AR, PrintMayAlias, *I1, *I2, F.getParent());
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++MayAliasCount;
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break;
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case PartialAlias:
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PrintLoadStoreResults(AR, PrintPartialAlias, *I1, *I2, F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintLoadStoreResults(AR, PrintMustAlias, *I1, *I2, F.getParent());
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++MustAliasCount;
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break;
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}
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}
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}
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}
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// Mod/ref alias analysis: compare all pairs of calls and values
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for (CallBase *Call : Calls) {
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for (auto Pointer : Pointers) {
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auto Size = LocationSize::afterPointer();
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Type *ElTy = cast<PointerType>(Pointer->getType())->getElementType();
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if (ElTy->isSized())
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Size = LocationSize::precise(DL.getTypeStoreSize(ElTy));
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switch (AA.getModRefInfo(Call, Pointer, Size)) {
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case ModRefInfo::NoModRef:
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PrintModRefResults("NoModRef", PrintNoModRef, Call, Pointer,
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F.getParent());
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++NoModRefCount;
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break;
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case ModRefInfo::Mod:
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PrintModRefResults("Just Mod", PrintMod, Call, Pointer, F.getParent());
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++ModCount;
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break;
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case ModRefInfo::Ref:
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PrintModRefResults("Just Ref", PrintRef, Call, Pointer, F.getParent());
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++RefCount;
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break;
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case ModRefInfo::ModRef:
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PrintModRefResults("Both ModRef", PrintModRef, Call, Pointer,
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F.getParent());
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++ModRefCount;
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break;
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case ModRefInfo::Must:
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PrintModRefResults("Must", PrintMust, Call, Pointer, F.getParent());
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++MustCount;
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break;
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case ModRefInfo::MustMod:
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PrintModRefResults("Just Mod (MustAlias)", PrintMustMod, Call, Pointer,
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F.getParent());
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++MustModCount;
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break;
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case ModRefInfo::MustRef:
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PrintModRefResults("Just Ref (MustAlias)", PrintMustRef, Call, Pointer,
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F.getParent());
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++MustRefCount;
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break;
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case ModRefInfo::MustModRef:
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PrintModRefResults("Both ModRef (MustAlias)", PrintMustModRef, Call,
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Pointer, F.getParent());
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++MustModRefCount;
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break;
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}
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}
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}
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// Mod/ref alias analysis: compare all pairs of calls
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for (CallBase *CallA : Calls) {
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for (CallBase *CallB : Calls) {
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if (CallA == CallB)
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continue;
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switch (AA.getModRefInfo(CallA, CallB)) {
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case ModRefInfo::NoModRef:
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PrintModRefResults("NoModRef", PrintNoModRef, CallA, CallB,
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F.getParent());
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++NoModRefCount;
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break;
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case ModRefInfo::Mod:
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PrintModRefResults("Just Mod", PrintMod, CallA, CallB, F.getParent());
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++ModCount;
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break;
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case ModRefInfo::Ref:
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PrintModRefResults("Just Ref", PrintRef, CallA, CallB, F.getParent());
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++RefCount;
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break;
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case ModRefInfo::ModRef:
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PrintModRefResults("Both ModRef", PrintModRef, CallA, CallB,
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F.getParent());
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++ModRefCount;
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break;
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case ModRefInfo::Must:
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PrintModRefResults("Must", PrintMust, CallA, CallB, F.getParent());
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++MustCount;
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break;
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case ModRefInfo::MustMod:
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PrintModRefResults("Just Mod (MustAlias)", PrintMustMod, CallA, CallB,
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F.getParent());
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++MustModCount;
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break;
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case ModRefInfo::MustRef:
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PrintModRefResults("Just Ref (MustAlias)", PrintMustRef, CallA, CallB,
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F.getParent());
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++MustRefCount;
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break;
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case ModRefInfo::MustModRef:
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PrintModRefResults("Both ModRef (MustAlias)", PrintMustModRef, CallA,
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CallB, F.getParent());
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++MustModRefCount;
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break;
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}
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}
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}
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}
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static void PrintPercent(int64_t Num, int64_t Sum) {
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errs() << "(" << Num * 100LL / Sum << "." << ((Num * 1000LL / Sum) % 10)
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<< "%)\n";
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}
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AAEvaluator::~AAEvaluator() {
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if (FunctionCount == 0)
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return;
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int64_t AliasSum =
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NoAliasCount + MayAliasCount + PartialAliasCount + MustAliasCount;
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errs() << "===== Alias Analysis Evaluator Report =====\n";
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if (AliasSum == 0) {
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errs() << " Alias Analysis Evaluator Summary: No pointers!\n";
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} else {
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errs() << " " << AliasSum << " Total Alias Queries Performed\n";
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errs() << " " << NoAliasCount << " no alias responses ";
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PrintPercent(NoAliasCount, AliasSum);
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errs() << " " << MayAliasCount << " may alias responses ";
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PrintPercent(MayAliasCount, AliasSum);
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errs() << " " << PartialAliasCount << " partial alias responses ";
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PrintPercent(PartialAliasCount, AliasSum);
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errs() << " " << MustAliasCount << " must alias responses ";
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PrintPercent(MustAliasCount, AliasSum);
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errs() << " Alias Analysis Evaluator Pointer Alias Summary: "
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<< NoAliasCount * 100 / AliasSum << "%/"
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<< MayAliasCount * 100 / AliasSum << "%/"
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<< PartialAliasCount * 100 / AliasSum << "%/"
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<< MustAliasCount * 100 / AliasSum << "%\n";
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}
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// Display the summary for mod/ref analysis
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int64_t ModRefSum = NoModRefCount + RefCount + ModCount + ModRefCount +
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MustCount + MustRefCount + MustModCount + MustModRefCount;
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if (ModRefSum == 0) {
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errs() << " Alias Analysis Mod/Ref Evaluator Summary: no "
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"mod/ref!\n";
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} else {
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errs() << " " << ModRefSum << " Total ModRef Queries Performed\n";
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errs() << " " << NoModRefCount << " no mod/ref responses ";
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PrintPercent(NoModRefCount, ModRefSum);
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errs() << " " << ModCount << " mod responses ";
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PrintPercent(ModCount, ModRefSum);
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errs() << " " << RefCount << " ref responses ";
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PrintPercent(RefCount, ModRefSum);
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errs() << " " << ModRefCount << " mod & ref responses ";
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PrintPercent(ModRefCount, ModRefSum);
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errs() << " " << MustCount << " must responses ";
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PrintPercent(MustCount, ModRefSum);
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errs() << " " << MustModCount << " must mod responses ";
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PrintPercent(MustModCount, ModRefSum);
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errs() << " " << MustRefCount << " must ref responses ";
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PrintPercent(MustRefCount, ModRefSum);
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errs() << " " << MustModRefCount << " must mod & ref responses ";
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PrintPercent(MustModRefCount, ModRefSum);
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errs() << " Alias Analysis Evaluator Mod/Ref Summary: "
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<< NoModRefCount * 100 / ModRefSum << "%/"
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<< ModCount * 100 / ModRefSum << "%/" << RefCount * 100 / ModRefSum
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<< "%/" << ModRefCount * 100 / ModRefSum << "%/"
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<< MustCount * 100 / ModRefSum << "%/"
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<< MustRefCount * 100 / ModRefSum << "%/"
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<< MustModCount * 100 / ModRefSum << "%/"
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<< MustModRefCount * 100 / ModRefSum << "%\n";
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}
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}
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namespace llvm {
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class AAEvalLegacyPass : public FunctionPass {
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std::unique_ptr<AAEvaluator> P;
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public:
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static char ID; // Pass identification, replacement for typeid
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AAEvalLegacyPass() : FunctionPass(ID) {
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initializeAAEvalLegacyPassPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AAResultsWrapperPass>();
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AU.setPreservesAll();
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}
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bool doInitialization(Module &M) override {
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P.reset(new AAEvaluator());
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return false;
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}
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bool runOnFunction(Function &F) override {
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P->runInternal(F, getAnalysis<AAResultsWrapperPass>().getAAResults());
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return false;
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}
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bool doFinalization(Module &M) override {
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P.reset();
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return false;
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}
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};
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}
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char AAEvalLegacyPass::ID = 0;
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INITIALIZE_PASS_BEGIN(AAEvalLegacyPass, "aa-eval",
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"Exhaustive Alias Analysis Precision Evaluator", false,
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true)
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INITIALIZE_PASS_DEPENDENCY(AAResultsWrapperPass)
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INITIALIZE_PASS_END(AAEvalLegacyPass, "aa-eval",
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"Exhaustive Alias Analysis Precision Evaluator", false,
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true)
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FunctionPass *llvm::createAAEvalPass() { return new AAEvalLegacyPass(); }
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