#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Assembly/Writer.h"
-#include "llvm/Target/TargetData.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/CommandLine.h"
public:
static char ID; // Pass identification, replacement for typeid
- AAEval() : FunctionPass(&ID) {}
+ AAEval() : FunctionPass(ID) {
+ initializeAAEvalPass(*PassRegistry::getPassRegistry());
+ }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AliasAnalysis>();
}
char AAEval::ID = 0;
-static RegisterPass<AAEval>
-X("aa-eval", "Exhaustive Alias Analysis Precision Evaluator", false, true);
+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)
FunctionPass *llvm::createAAEvalPass() { return new AAEval(); }
if (o2 < o1)
std::swap(o1, o2);
- dbgs() << " " << Msg << ":\t"
+ errs() << " " << Msg << ":\t"
<< o1 << ", "
<< o2 << "\n";
}
PrintModRefResults(const char *Msg, bool P, Instruction *I, Value *Ptr,
Module *M) {
if (P) {
- dbgs() << " " << Msg << ": Ptr: ";
- WriteAsOperand(dbgs(), Ptr, true, M);
- dbgs() << "\t<->" << *I << '\n';
+ errs() << " " << Msg << ": Ptr: ";
+ WriteAsOperand(errs(), Ptr, true, M);
+ errs() << "\t<->" << *I << '\n';
+ }
+}
+
+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);
+}
+
bool AAEval::runOnFunction(Function &F) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
SetVector<CallSite> CallSites;
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
- if (isa<PointerType>(I->getType())) // Add all pointer arguments
+ if (I->getType()->isPointerTy()) // Add all pointer arguments.
Pointers.insert(I);
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
- if (isa<PointerType>(I->getType())) // Add all pointer instructions
+ if (I->getType()->isPointerTy()) // Add all pointer instructions.
Pointers.insert(&*I);
Instruction &Inst = *I;
- User::op_iterator OI = Inst.op_begin();
- CallSite CS = CallSite::get(&Inst);
- if (CS.getInstruction() &&
- isa<Function>(CS.getCalledValue()))
- ++OI; // Skip actual functions for direct function calls.
- for (; OI != Inst.op_end(); ++OI)
- if (isa<PointerType>((*OI)->getType()) && !isa<ConstantPointerNull>(*OI))
- Pointers.insert(*OI);
-
- if (CS.getInstruction()) CallSites.insert(CS);
+ if (CallSite CS = cast<Value>(&Inst)) {
+ Value *Callee = CS.getCalledValue();
+ // Skip actual functions for direct function calls.
+ if (!isa<Function>(Callee) && isInterestingPointer(Callee))
+ Pointers.insert(Callee);
+ // Consider formals.
+ for (CallSite::arg_iterator AI = CS.arg_begin(), AE = CS.arg_end();
+ 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();
+ OI != OE; ++OI)
+ if (isInterestingPointer(*OI))
+ Pointers.insert(*OI);
+ }
}
if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
PrintNoModRef || PrintMod || PrintRef || PrintModRef)
- dbgs() << "Function: " << F.getName() << ": " << Pointers.size()
+ 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);
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);
PrintResults("MustAlias", PrintMustAlias, *I1, *I2, F.getParent());
++MustAlias; break;
default:
- dbgs() << "Unknown alias query result!\n";
+ 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);
PrintModRefResults("NoModRef", PrintNoModRef, I, *V, F.getParent());
++NoModRef; break;
case AliasAnalysis::Mod:
- PrintModRefResults(" Mod", PrintMod, I, *V, F.getParent());
+ PrintModRefResults("Just Mod", PrintMod, I, *V, F.getParent());
++Mod; break;
case AliasAnalysis::Ref:
- PrintModRefResults(" Ref", PrintRef, I, *V, F.getParent());
+ PrintModRefResults("Just Ref", PrintRef, I, *V, F.getParent());
++Ref; break;
case AliasAnalysis::ModRef:
- PrintModRefResults(" ModRef", PrintModRef, I, *V, F.getParent());
+ PrintModRefResults("Both ModRef", PrintModRef, I, *V, F.getParent());
++ModRef; break;
default:
- dbgs() << "Unknown alias query result!\n";
+ errs() << "Unknown alias query result!\n";
+ }
+ }
+ }
+
+ // 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;
}
}
}
}
static void PrintPercent(unsigned Num, unsigned Sum) {
- dbgs() << "(" << Num*100ULL/Sum << "."
+ errs() << "(" << Num*100ULL/Sum << "."
<< ((Num*1000ULL/Sum) % 10) << "%)\n";
}
bool AAEval::doFinalization(Module &M) {
unsigned AliasSum = NoAlias + MayAlias + MustAlias;
- dbgs() << "===== Alias Analysis Evaluator Report =====\n";
+ errs() << "===== Alias Analysis Evaluator Report =====\n";
if (AliasSum == 0) {
- dbgs() << " Alias Analysis Evaluator Summary: No pointers!\n";
+ errs() << " Alias Analysis Evaluator Summary: No pointers!\n";
} else {
- dbgs() << " " << AliasSum << " Total Alias Queries Performed\n";
- dbgs() << " " << NoAlias << " no alias responses ";
+ errs() << " " << AliasSum << " Total Alias Queries Performed\n";
+ errs() << " " << NoAlias << " no alias responses ";
PrintPercent(NoAlias, AliasSum);
- dbgs() << " " << MayAlias << " may alias responses ";
+ errs() << " " << MayAlias << " may alias responses ";
PrintPercent(MayAlias, AliasSum);
- dbgs() << " " << MustAlias << " must alias responses ";
+ errs() << " " << MustAlias << " must alias responses ";
PrintPercent(MustAlias, AliasSum);
- dbgs() << " Alias Analysis Evaluator Pointer Alias Summary: "
+ errs() << " Alias Analysis Evaluator Pointer Alias Summary: "
<< NoAlias*100/AliasSum << "%/" << MayAlias*100/AliasSum << "%/"
<< MustAlias*100/AliasSum << "%\n";
}
// Display the summary for mod/ref analysis
unsigned ModRefSum = NoModRef + Mod + Ref + ModRef;
if (ModRefSum == 0) {
- dbgs() << " Alias Analysis Mod/Ref Evaluator Summary: no mod/ref!\n";
+ errs() << " Alias Analysis Mod/Ref Evaluator Summary: no mod/ref!\n";
} else {
- dbgs() << " " << ModRefSum << " Total ModRef Queries Performed\n";
- dbgs() << " " << NoModRef << " no mod/ref responses ";
+ errs() << " " << ModRefSum << " Total ModRef Queries Performed\n";
+ errs() << " " << NoModRef << " no mod/ref responses ";
PrintPercent(NoModRef, ModRefSum);
- dbgs() << " " << Mod << " mod responses ";
+ errs() << " " << Mod << " mod responses ";
PrintPercent(Mod, ModRefSum);
- dbgs() << " " << Ref << " ref responses ";
+ errs() << " " << Ref << " ref responses ";
PrintPercent(Ref, ModRefSum);
- dbgs() << " " << ModRef << " mod & ref responses ";
+ errs() << " " << ModRef << " mod & ref responses ";
PrintPercent(ModRef, ModRefSum);
- dbgs() << " Alias Analysis Evaluator Mod/Ref Summary: "
+ errs() << " Alias Analysis Evaluator Mod/Ref Summary: "
<< NoModRef*100/ModRefSum << "%/" << Mod*100/ModRefSum << "%/"
<< Ref*100/ModRefSum << "%/" << ModRef*100/ModRefSum << "%\n";
}
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