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247 lines
8.7 KiB
C++
247 lines
8.7 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/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SetVector.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> 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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namespace {
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class AAEval : public FunctionPass {
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unsigned NoAlias, MayAlias, MustAlias;
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unsigned NoModRef, Mod, Ref, ModRef;
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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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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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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) {
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NoAlias = MayAlias = MustAlias = 0;
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NoModRef = Mod = Ref = ModRef = 0;
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if (PrintAll) {
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PrintNoAlias = PrintMayAlias = 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);
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bool doFinalization(Module &M);
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};
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}
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char AAEval::ID = 0;
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static RegisterPass<AAEval>
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X("aa-eval", "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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WriteAsOperand(os1, V1, true, M);
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WriteAsOperand(os2, V2, 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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WriteAsOperand(errs(), Ptr, true, M);
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errs() << "\t<->" << *I << '\n';
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}
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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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for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
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if (isa<PointerType>(I->getType())) // 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 (isa<PointerType>(I->getType())) // Add all pointer instructions
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Pointers.insert(&*I);
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Instruction &Inst = *I;
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User::op_iterator OI = Inst.op_begin();
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CallSite CS = CallSite::get(&Inst);
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if (CS.getInstruction() &&
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isa<Function>(CS.getCalledValue()))
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++OI; // Skip actual functions for direct function calls.
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for (; OI != Inst.op_end(); ++OI)
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if (isa<PointerType>((*OI)->getType()) && !isa<ConstantPointerNull>(*OI))
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Pointers.insert(*OI);
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if (CS.getInstruction()) CallSites.insert(CS);
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}
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if (PrintNoAlias || PrintMayAlias || 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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unsigned I1Size = ~0u;
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const 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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unsigned I2Size = ~0u;
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const 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 AliasAnalysis::NoAlias:
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PrintResults("NoAlias", PrintNoAlias, *I1, *I2, F.getParent());
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++NoAlias; break;
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case AliasAnalysis::MayAlias:
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PrintResults("MayAlias", PrintMayAlias, *I1, *I2, F.getParent());
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++MayAlias; break;
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case AliasAnalysis::MustAlias:
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PrintResults("MustAlias", PrintMustAlias, *I1, *I2, F.getParent());
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++MustAlias; break;
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default:
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errs() << "Unknown alias query result!\n";
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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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unsigned Size = ~0u;
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const 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 AliasAnalysis::NoModRef:
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PrintModRefResults("NoModRef", PrintNoModRef, I, *V, F.getParent());
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++NoModRef; break;
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case AliasAnalysis::Mod:
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PrintModRefResults(" Mod", PrintMod, I, *V, F.getParent());
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++Mod; break;
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case AliasAnalysis::Ref:
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PrintModRefResults(" Ref", PrintRef, I, *V, F.getParent());
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++Ref; break;
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case AliasAnalysis::ModRef:
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PrintModRefResults(" ModRef", PrintModRef, I, *V, F.getParent());
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++ModRef; break;
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default:
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errs() << "Unknown alias query result!\n";
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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 = NoAlias + MayAlias + MustAlias;
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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() << " " << NoAlias << " no alias responses ";
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PrintPercent(NoAlias, AliasSum);
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errs() << " " << MayAlias << " may alias responses ";
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PrintPercent(MayAlias, AliasSum);
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errs() << " " << MustAlias << " must alias responses ";
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PrintPercent(MustAlias, AliasSum);
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errs() << " Alias Analysis Evaluator Pointer Alias Summary: "
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<< NoAlias*100/AliasSum << "%/" << MayAlias*100/AliasSum << "%/"
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<< MustAlias*100/AliasSum << "%\n";
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}
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// Display the summary for mod/ref analysis
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unsigned ModRefSum = NoModRef + Mod + Ref + ModRef;
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if (ModRefSum == 0) {
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errs() << " Alias Analysis Mod/Ref Evaluator Summary: no mod/ref!\n";
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} else {
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errs() << " " << ModRefSum << " Total ModRef Queries Performed\n";
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errs() << " " << NoModRef << " no mod/ref responses ";
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PrintPercent(NoModRef, ModRefSum);
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errs() << " " << Mod << " mod responses ";
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PrintPercent(Mod, ModRefSum);
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errs() << " " << Ref << " ref responses ";
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PrintPercent(Ref, ModRefSum);
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errs() << " " << ModRef << " mod & ref responses ";
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PrintPercent(ModRef, ModRefSum);
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errs() << " Alias Analysis Evaluator Mod/Ref Summary: "
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<< NoModRef*100/ModRefSum << "%/" << Mod*100/ModRefSum << "%/"
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<< Ref*100/ModRefSum << "%/" << ModRef*100/ModRefSum << "%\n";
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}
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return false;
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}
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