#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
-#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/AliasAnalysis.h"
static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
namespace {
- /// AAEval - Base class for exhaustive alias analysis evaluators.
- class AAEval {
- protected:
+ class AAEval : public FunctionPass {
unsigned NoAlias, MayAlias, MustAlias;
unsigned NoModRef, Mod, Ref, ModRef;
- SetVector<Value *> Pointers;
- SetVector<CallSite> CallSites;
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ AAEval() : FunctionPass(ID) {
+ initializeAAEvalPass(*PassRegistry::getPassRegistry());
+ }
- void getAnalysisUsage(AnalysisUsage &AU) const {
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AliasAnalysis>();
AU.setPreservesAll();
}
- void doInitialization(Module &M) {
+ bool doInitialization(Module &M) {
NoAlias = MayAlias = MustAlias = 0;
NoModRef = Mod = Ref = ModRef = 0;
PrintNoAlias = PrintMayAlias = PrintMustAlias = true;
PrintNoModRef = PrintMod = PrintRef = PrintModRef = true;
}
- }
-
- void runOnFunction(Function &F);
- void evaluate(AliasAnalysis *AA, Module *M);
- void doFinalization(Module &M);
- };
-
- class FunctionAAEval : public FunctionPass, AAEval {
- public:
- static char ID; // Pass identification, replacement for typeid
- FunctionAAEval() : FunctionPass(&ID) {}
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- return AAEval::getAnalysisUsage(AU);
- }
-
- virtual bool doInitialization(Module &M) {
- AAEval::doInitialization(M);
return false;
}
- virtual bool runOnFunction(Function &F) {
- AAEval::runOnFunction(F);
-
- if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
- PrintNoModRef || PrintMod || PrintRef || PrintModRef)
- errs() << "Function: " << F.getName() << ": " << Pointers.size()
- << " pointers, " << CallSites.size() << " call sites\n";
-
- AAEval::evaluate(&getAnalysis<AliasAnalysis>(), F.getParent());
- return false;
- }
-
- virtual bool doFinalization(Module &M) {
- AAEval::doFinalization(M);
- return false;
- }
- };
-
- class InterproceduralAAEval : public ModulePass, AAEval {
- public:
- static char ID; // Pass identification, replacement for typeid
- InterproceduralAAEval() : ModulePass(&ID) {}
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- return AAEval::getAnalysisUsage(AU);
- }
-
- virtual bool runOnModule(Module &M) {
- AAEval::doInitialization(M);
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- AAEval::runOnFunction(*I);
-
- if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
- PrintNoModRef || PrintMod || PrintRef || PrintModRef)
- errs() << "Module: " << Pointers.size()
- << " pointers, " << CallSites.size() << " call sites\n";
-
- AAEval::evaluate(&getAnalysis<AliasAnalysis>(), &M);
- AAEval::doFinalization(M);
- return false;
- }
+ bool runOnFunction(Function &F);
+ bool doFinalization(Module &M);
};
}
-char FunctionAAEval::ID = 0;
-static RegisterPass<FunctionAAEval>
-X("aa-eval", "Exhaustive Alias Analysis Precision Evaluator", false, true);
-
-FunctionPass *llvm::createAAEvalPass() { return new FunctionAAEval(); }
-
-char InterproceduralAAEval::ID = 0;
-static RegisterPass<InterproceduralAAEval>
-Y("interprocedural-aa-eval",
- "Exhaustive Interprocedural Alias Analysis Precision Evaluator", false, true);
+char AAEval::ID = 0;
+INITIALIZE_PASS_BEGIN(AAEval, "aa-eval",
+ "Exhaustive Alias Analysis Precision Evaluator", false, true)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
+INITIALIZE_PASS_END(AAEval, "aa-eval",
+ "Exhaustive Alias Analysis Precision Evaluator", false, true)
-Pass *llvm::createInterproceduralAAEvalPass() {
- return new InterproceduralAAEval();
-}
+FunctionPass *llvm::createAAEvalPass() { return new AAEval(); }
static void PrintResults(const char *Msg, bool P, const Value *V1,
const Value *V2, const Module *M) {
}
}
+static inline void
+PrintModRefResults(const char *Msg, bool P, CallSite CSA, CallSite CSB,
+ Module *M) {
+ if (P) {
+ errs() << " " << Msg << ": " << *CSA.getInstruction()
+ << " <-> " << *CSB.getInstruction() << '\n';
+ }
+}
+
static inline bool isInterestingPointer(Value *V) {
return V->getType()->isPointerTy()
&& !isa<ConstantPointerNull>(V);
}
-void AAEval::runOnFunction(Function &F) {
+bool AAEval::runOnFunction(Function &F) {
+ AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
+
+ SetVector<Value *> Pointers;
+ SetVector<CallSite> CallSites;
+
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
if (I->getType()->isPointerTy()) // Add all pointer arguments.
Pointers.insert(I);
if (I->getType()->isPointerTy()) // Add all pointer instructions.
Pointers.insert(&*I);
Instruction &Inst = *I;
- CallSite CS = CallSite::get(&Inst);
- if (CS) {
+ if (CallSite CS = cast<Value>(&Inst)) {
Value *Callee = CS.getCalledValue();
// Skip actual functions for direct function calls.
if (!isa<Function>(Callee) && isInterestingPointer(Callee))
AI != AE; ++AI)
if (isInterestingPointer(*AI))
Pointers.insert(*AI);
+ CallSites.insert(CS);
} else {
// Consider all operands.
for (Instruction::op_iterator OI = Inst.op_begin(), OE = Inst.op_end();
if (isInterestingPointer(*OI))
Pointers.insert(*OI);
}
-
- if (CS.getInstruction()) CallSites.insert(CS);
}
-}
-void AAEval::evaluate(AliasAnalysis *AA, Module *M) {
+ if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
+ PrintNoModRef || PrintMod || PrintRef || PrintModRef)
+ errs() << "Function: " << F.getName() << ": " << Pointers.size()
+ << " pointers, " << CallSites.size() << " call sites\n";
// iterate over the worklist, and run the full (n^2)/2 disambiguations
for (SetVector<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end();
I1 != E; ++I1) {
- unsigned I1Size = ~0u;
+ unsigned I1Size = AliasAnalysis::UnknownSize;
const Type *I1ElTy = cast<PointerType>((*I1)->getType())->getElementType();
- if (I1ElTy->isSized()) I1Size = AA->getTypeStoreSize(I1ElTy);
+ if (I1ElTy->isSized()) I1Size = AA.getTypeStoreSize(I1ElTy);
for (SetVector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) {
- unsigned I2Size = ~0u;
+ unsigned I2Size = AliasAnalysis::UnknownSize;
const Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType();
- if (I2ElTy->isSized()) I2Size = AA->getTypeStoreSize(I2ElTy);
+ if (I2ElTy->isSized()) I2Size = AA.getTypeStoreSize(I2ElTy);
- switch (AA->alias(*I1, I1Size, *I2, I2Size)) {
+ switch (AA.alias(*I1, I1Size, *I2, I2Size)) {
case AliasAnalysis::NoAlias:
- PrintResults("NoAlias", PrintNoAlias, *I1, *I2, M);
+ PrintResults("NoAlias", PrintNoAlias, *I1, *I2, F.getParent());
++NoAlias; break;
case AliasAnalysis::MayAlias:
- PrintResults("MayAlias", PrintMayAlias, *I1, *I2, M);
+ PrintResults("MayAlias", PrintMayAlias, *I1, *I2, F.getParent());
++MayAlias; break;
case AliasAnalysis::MustAlias:
- PrintResults("MustAlias", PrintMustAlias, *I1, *I2, M);
+ PrintResults("MustAlias", PrintMustAlias, *I1, *I2, F.getParent());
++MustAlias; break;
default:
errs() << "Unknown alias query result!\n";
for (SetVector<Value *>::iterator V = Pointers.begin(), Ve = Pointers.end();
V != Ve; ++V) {
- unsigned Size = ~0u;
+ unsigned Size = AliasAnalysis::UnknownSize;
const Type *ElTy = cast<PointerType>((*V)->getType())->getElementType();
- if (ElTy->isSized()) Size = AA->getTypeStoreSize(ElTy);
+ if (ElTy->isSized()) Size = AA.getTypeStoreSize(ElTy);
- switch (AA->getModRefInfo(*C, *V, Size)) {
+ switch (AA.getModRefInfo(*C, *V, Size)) {
case AliasAnalysis::NoModRef:
- PrintModRefResults("NoModRef", PrintNoModRef, I, *V, M);
+ PrintModRefResults("NoModRef", PrintNoModRef, I, *V, F.getParent());
++NoModRef; break;
case AliasAnalysis::Mod:
- PrintModRefResults(" Mod", PrintMod, I, *V, M);
+ PrintModRefResults("Just Mod", PrintMod, I, *V, F.getParent());
++Mod; break;
case AliasAnalysis::Ref:
- PrintModRefResults(" Ref", PrintRef, I, *V, M);
+ PrintModRefResults("Just Ref", PrintRef, I, *V, F.getParent());
++Ref; break;
case AliasAnalysis::ModRef:
- PrintModRefResults(" ModRef", PrintModRef, I, *V, M);
+ PrintModRefResults("Both ModRef", PrintModRef, I, *V, F.getParent());
++ModRef; break;
default:
errs() << "Unknown alias query result!\n";
}
}
- Pointers.clear();
- CallSites.clear();
+ // Mod/ref alias analysis: compare all pairs of calls
+ for (SetVector<CallSite>::iterator C = CallSites.begin(),
+ Ce = CallSites.end(); C != Ce; ++C) {
+ for (SetVector<CallSite>::iterator D = CallSites.begin(); D != Ce; ++D) {
+ if (D == C)
+ continue;
+ switch (AA.getModRefInfo(*C, *D)) {
+ case AliasAnalysis::NoModRef:
+ PrintModRefResults("NoModRef", PrintNoModRef, *C, *D, F.getParent());
+ ++NoModRef; break;
+ case AliasAnalysis::Mod:
+ PrintModRefResults("Just Mod", PrintMod, *C, *D, F.getParent());
+ ++Mod; break;
+ case AliasAnalysis::Ref:
+ PrintModRefResults("Just Ref", PrintRef, *C, *D, F.getParent());
+ ++Ref; break;
+ case AliasAnalysis::ModRef:
+ PrintModRefResults("Both ModRef", PrintModRef, *C, *D, F.getParent());
+ ++ModRef; break;
+ }
+ }
+ }
+
+ return false;
}
static void PrintPercent(unsigned Num, unsigned Sum) {
<< ((Num*1000ULL/Sum) % 10) << "%)\n";
}
-void AAEval::doFinalization(Module &M) {
+bool AAEval::doFinalization(Module &M) {
unsigned AliasSum = NoAlias + MayAlias + MustAlias;
errs() << "===== Alias Analysis Evaluator Report =====\n";
if (AliasSum == 0) {
<< NoModRef*100/ModRefSum << "%/" << Mod*100/ModRefSum << "%/"
<< Ref*100/ModRefSum << "%/" << ModRef*100/ModRefSum << "%\n";
}
+
+ return false;
}
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