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52ab0bc417
preparation for de-coupling the AA implementations. In order to do this, they had to become fake-scoped using the traditional LLVM pattern of a leading initialism. These can't be actual scoped enumerations because they're bitfields and thus inherently we use them as integers. I've also renamed the behavior enums that are specific to reasoning about the mod/ref behavior of functions when called. This makes it more clear that they have a very narrow domain of applicability. I think there is a significantly cleaner API for all of this, but I don't want to try to do really substantive changes for now, I just want to refactor the things away from analysis groups so I'm preserving the exact original design and just cleaning up the names, style, and lifting out of the class. Differential Revision: http://reviews.llvm.org/D10564 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242963 91177308-0d34-0410-b5e6-96231b3b80d8
396 lines
14 KiB
C++
396 lines
14 KiB
C++
//===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a simple N^2 alias analysis accuracy evaluator.
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// Basically, for each function in the program, it simply queries to see how the
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// alias analysis implementation answers alias queries between each pair of
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// pointers in the function.
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//
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// This is inspired and adapted from code by: Naveen Neelakantam, Francesco
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// Spadini, and Wojciech Stryjewski.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.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/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/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> PrintMod("print-mod", cl::ReallyHidden);
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static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden);
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static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
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static cl::opt<bool> EvalAAMD("evaluate-aa-metadata", cl::ReallyHidden);
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namespace {
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class AAEval : public FunctionPass {
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unsigned NoAliasCount, MayAliasCount, PartialAliasCount, MustAliasCount;
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unsigned NoModRefCount, ModCount, RefCount, ModRefCount;
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public:
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static char ID; // Pass identification, replacement for typeid
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AAEval() : FunctionPass(ID) {
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initializeAAEvalPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AliasAnalysis>();
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AU.setPreservesAll();
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}
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bool doInitialization(Module &M) override {
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NoAliasCount = MayAliasCount = PartialAliasCount = MustAliasCount = 0;
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NoModRefCount = ModCount = RefCount = ModRefCount = 0;
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if (PrintAll) {
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PrintNoAlias = PrintMayAlias = true;
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PrintPartialAlias = PrintMustAlias = true;
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PrintNoModRef = PrintMod = PrintRef = PrintModRef = true;
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}
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return false;
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}
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bool runOnFunction(Function &F) override;
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bool doFinalization(Module &M) override;
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};
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}
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char AAEval::ID = 0;
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INITIALIZE_PASS_BEGIN(AAEval, "aa-eval",
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"Exhaustive Alias Analysis Precision Evaluator", false, true)
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INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
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INITIALIZE_PASS_END(AAEval, "aa-eval",
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"Exhaustive Alias Analysis Precision Evaluator", false, true)
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FunctionPass *llvm::createAAEvalPass() { return new AAEval(); }
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static void PrintResults(const char *Msg, bool P, const Value *V1,
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const Value *V2, const Module *M) {
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if (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() << " " << Msg << ":\t"
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<< o1 << ", "
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<< o2 << "\n";
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}
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}
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static inline void
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PrintModRefResults(const char *Msg, bool P, Instruction *I, Value *Ptr,
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Module *M) {
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if (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
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PrintModRefResults(const char *Msg, bool P, CallSite CSA, CallSite CSB,
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Module *M) {
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if (P) {
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errs() << " " << Msg << ": " << *CSA.getInstruction()
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<< " <-> " << *CSB.getInstruction() << '\n';
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}
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}
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static inline void
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PrintLoadStoreResults(const char *Msg, bool P, const Value *V1,
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const Value *V2, const Module *M) {
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if (P) {
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errs() << " " << Msg << ": " << *V1
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<< " <-> " << *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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bool AAEval::runOnFunction(Function &F) {
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AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
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SetVector<Value *> Pointers;
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SetVector<CallSite> CallSites;
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SetVector<Value *> Loads;
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SetVector<Value *> Stores;
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for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
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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 CS = CallSite(&Inst)) {
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Value *Callee = CS.getCalledValue();
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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 (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
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AI != AE; ++AI)
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if (isInterestingPointer(*AI))
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Pointers.insert(*AI);
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CallSites.insert(CS);
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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 (PrintNoAlias || PrintMayAlias || PrintPartialAlias || PrintMustAlias ||
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PrintNoModRef || PrintMod || PrintRef || PrintModRef)
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errs() << "Function: " << F.getName() << ": " << Pointers.size()
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<< " pointers, " << CallSites.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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uint64_t I1Size = MemoryLocation::UnknownSize;
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Type *I1ElTy = cast<PointerType>((*I1)->getType())->getElementType();
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if (I1ElTy->isSized()) I1Size = AA.getTypeStoreSize(I1ElTy);
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for (SetVector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) {
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uint64_t I2Size = MemoryLocation::UnknownSize;
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Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType();
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if (I2ElTy->isSized()) I2Size = AA.getTypeStoreSize(I2ElTy);
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switch (AA.alias(*I1, I1Size, *I2, I2Size)) {
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case NoAlias:
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PrintResults("NoAlias", 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("MayAlias", 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("PartialAlias", PrintPartialAlias, *I1, *I2,
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F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintResults("MustAlias", 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 (SetVector<Value *>::iterator I1 = Loads.begin(), E = Loads.end();
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I1 != E; ++I1) {
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for (SetVector<Value *>::iterator I2 = Stores.begin(), E2 = Stores.end();
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I2 != E2; ++I2) {
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switch (AA.alias(MemoryLocation::get(cast<LoadInst>(*I1)),
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MemoryLocation::get(cast<StoreInst>(*I2)))) {
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case NoAlias:
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PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2,
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F.getParent());
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++NoAliasCount;
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break;
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case MayAlias:
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PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2,
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F.getParent());
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++MayAliasCount;
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break;
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case PartialAlias:
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PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2,
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F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2,
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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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switch (AA.alias(MemoryLocation::get(cast<StoreInst>(*I1)),
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MemoryLocation::get(cast<StoreInst>(*I2)))) {
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case NoAlias:
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PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2,
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F.getParent());
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++NoAliasCount;
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break;
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case MayAlias:
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PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2,
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F.getParent());
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++MayAliasCount;
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break;
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case PartialAlias:
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PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2,
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F.getParent());
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++PartialAliasCount;
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break;
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case MustAlias:
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PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2,
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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 (SetVector<CallSite>::iterator C = CallSites.begin(),
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Ce = CallSites.end(); C != Ce; ++C) {
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Instruction *I = C->getInstruction();
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for (SetVector<Value *>::iterator V = Pointers.begin(), Ve = Pointers.end();
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V != Ve; ++V) {
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uint64_t Size = MemoryLocation::UnknownSize;
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Type *ElTy = cast<PointerType>((*V)->getType())->getElementType();
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if (ElTy->isSized()) Size = AA.getTypeStoreSize(ElTy);
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switch (AA.getModRefInfo(*C, *V, Size)) {
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case MRI_NoModRef:
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PrintModRefResults("NoModRef", PrintNoModRef, I, *V, F.getParent());
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++NoModRefCount;
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break;
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case MRI_Mod:
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PrintModRefResults("Just Mod", PrintMod, I, *V, F.getParent());
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++ModCount;
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break;
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case MRI_Ref:
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PrintModRefResults("Just Ref", PrintRef, I, *V, F.getParent());
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++RefCount;
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break;
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case MRI_ModRef:
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PrintModRefResults("Both ModRef", PrintModRef, I, *V, F.getParent());
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++ModRefCount;
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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 (SetVector<CallSite>::iterator C = CallSites.begin(),
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Ce = CallSites.end(); C != Ce; ++C) {
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for (SetVector<CallSite>::iterator D = CallSites.begin(); D != Ce; ++D) {
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if (D == C)
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continue;
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switch (AA.getModRefInfo(*C, *D)) {
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case MRI_NoModRef:
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PrintModRefResults("NoModRef", PrintNoModRef, *C, *D, F.getParent());
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++NoModRefCount;
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break;
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case MRI_Mod:
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PrintModRefResults("Just Mod", PrintMod, *C, *D, F.getParent());
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++ModCount;
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break;
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case MRI_Ref:
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PrintModRefResults("Just Ref", PrintRef, *C, *D, F.getParent());
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++RefCount;
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break;
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case MRI_ModRef:
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PrintModRefResults("Both ModRef", PrintModRef, *C, *D, F.getParent());
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++ModRefCount;
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break;
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}
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}
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}
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return false;
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}
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static void PrintPercent(unsigned Num, unsigned Sum) {
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errs() << "(" << Num*100ULL/Sum << "."
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<< ((Num*1000ULL/Sum) % 10) << "%)\n";
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}
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bool AAEval::doFinalization(Module &M) {
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unsigned 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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unsigned ModRefSum = NoModRefCount + ModCount + RefCount + ModRefCount;
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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() << " 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 << "%\n";
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}
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return false;
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}
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