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Generalize AAEval so that it can be used both per-function and
interprocedurally. Note that as of this writing, existing alias analysis passes are not prepared to be used interprocedurally. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107013 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -51,6 +51,13 @@ namespace llvm {
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//
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FunctionPass *createAAEvalPass();
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//===--------------------------------------------------------------------===//
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//
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// createInterproceduralAAEvalPass - This pass implements a simple
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// N^2 interprocedural alias analysis accuracy evaluator.
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//
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Pass *createInterproceduralAAEvalPass();
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//===--------------------------------------------------------------------===//
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//
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// createNoAAPass - This pass implements a "I don't know" alias analysis.
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@ -21,11 +21,11 @@
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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/Module.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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@ -45,20 +45,21 @@ 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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/// AAEval - Base class for exhaustive alias analysis evaluators.
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class AAEval {
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protected:
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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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SetVector<Value *> Pointers;
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SetVector<CallSite> CallSites;
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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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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void doInitialization(Module &M) {
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NoAlias = MayAlias = MustAlias = 0;
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NoModRef = Mod = Ref = ModRef = 0;
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@ -66,19 +67,85 @@ namespace {
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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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}
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void runOnFunction(Function &F);
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void evaluate(AliasAnalysis *AA, Module *M);
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void doFinalization(Module &M);
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};
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class FunctionAAEval : public FunctionPass, AAEval {
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public:
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static char ID; // Pass identification, replacement for typeid
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FunctionAAEval() : FunctionPass(&ID) {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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return AAEval::getAnalysisUsage(AU);
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}
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virtual bool doInitialization(Module &M) {
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AAEval::doInitialization(M);
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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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virtual bool runOnFunction(Function &F) {
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AAEval::runOnFunction(F);
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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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AAEval::evaluate(&getAnalysis<AliasAnalysis>(), F.getParent());
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return false;
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}
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virtual bool doFinalization(Module &M) {
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AAEval::doFinalization(M);
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return false;
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}
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};
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class InterproceduralAAEval : public ModulePass, AAEval {
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public:
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static char ID; // Pass identification, replacement for typeid
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InterproceduralAAEval() : ModulePass(&ID) {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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return AAEval::getAnalysisUsage(AU);
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}
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virtual bool runOnModule(Module &M) {
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AAEval::doInitialization(M);
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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AAEval::runOnFunction(*I);
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if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
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PrintNoModRef || PrintMod || PrintRef || PrintModRef)
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errs() << "Module: " << Pointers.size()
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<< " pointers, " << CallSites.size() << " call sites\n";
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AAEval::evaluate(&getAnalysis<AliasAnalysis>(), &M);
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AAEval::doFinalization(M);
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return false;
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}
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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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char FunctionAAEval::ID = 0;
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static RegisterPass<FunctionAAEval>
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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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FunctionPass *llvm::createAAEvalPass() { return new FunctionAAEval(); }
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char InterproceduralAAEval::ID = 0;
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static RegisterPass<InterproceduralAAEval>
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Y("interprocedural-aa-eval",
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"Exhaustive Interprocedural Alias Analysis Precision Evaluator", false, true);
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Pass *llvm::createInterproceduralAAEvalPass() {
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return new InterproceduralAAEval();
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}
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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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@ -113,12 +180,7 @@ static inline bool isInterestingPointer(Value *V) {
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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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void AAEval::runOnFunction(Function &F) {
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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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@ -148,33 +210,31 @@ bool AAEval::runOnFunction(Function &F) {
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if (CS.getInstruction()) CallSites.insert(CS);
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}
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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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void AAEval::evaluate(AliasAnalysis *AA, Module *M) {
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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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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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if (I2ElTy->isSized()) I2Size = AA->getTypeStoreSize(I2ElTy);
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switch (AA.alias(*I1, I1Size, *I2, I2Size)) {
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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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PrintResults("NoAlias", PrintNoAlias, *I1, *I2, M);
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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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PrintResults("MayAlias", PrintMayAlias, *I1, *I2, M);
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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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PrintResults("MustAlias", PrintMustAlias, *I1, *I2, M);
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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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@ -191,20 +251,20 @@ bool AAEval::runOnFunction(Function &F) {
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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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if (ElTy->isSized()) Size = AA->getTypeStoreSize(ElTy);
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switch (AA.getModRefInfo(*C, *V, Size)) {
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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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PrintModRefResults("NoModRef", PrintNoModRef, I, *V, M);
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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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PrintModRefResults(" Mod", PrintMod, I, *V, M);
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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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PrintModRefResults(" Ref", PrintRef, I, *V, M);
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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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PrintModRefResults(" ModRef", PrintModRef, I, *V, M);
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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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@ -212,7 +272,8 @@ bool AAEval::runOnFunction(Function &F) {
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}
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}
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return false;
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Pointers.clear();
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CallSites.clear();
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}
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static void PrintPercent(unsigned Num, unsigned Sum) {
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@ -220,7 +281,7 @@ static void PrintPercent(unsigned Num, unsigned 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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void 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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@ -256,6 +317,4 @@ bool AAEval::doFinalization(Module &M) {
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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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