#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"
static cl::opt<bool> PrintNoAlias("print-no-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintMayAlias("print-may-aliases", cl::ReallyHidden);
+static cl::opt<bool> PrintPartialAlias("print-partial-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintMustAlias("print-must-aliases", cl::ReallyHidden);
static cl::opt<bool> PrintNoModRef("print-no-modref", cl::ReallyHidden);
namespace {
class AAEval : public FunctionPass {
- unsigned NoAlias, MayAlias, MustAlias;
+ unsigned NoAlias, MayAlias, PartialAlias, MustAlias;
unsigned NoModRef, Mod, Ref, ModRef;
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>();
}
bool doInitialization(Module &M) {
- NoAlias = MayAlias = MustAlias = 0;
+ NoAlias = MayAlias = PartialAlias = MustAlias = 0;
NoModRef = Mod = Ref = ModRef = 0;
if (PrintAll) {
- PrintNoAlias = PrintMayAlias = PrintMustAlias = true;
+ PrintNoAlias = PrintMayAlias = true;
+ PrintPartialAlias = PrintMustAlias = true;
PrintNoModRef = PrintMod = PrintRef = PrintModRef = true;
}
return false;
}
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(); }
}
}
+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);
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);
}
- if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
+ if (PrintNoAlias || PrintMayAlias || PrintPartialAlias || 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;
-
const Type *I1ElTy = cast<PointerType>((*I1)->getType())->getElementType();
+ uint64_t I1Size = AliasAnalysis::UnknownSize;
+ 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;
-
const Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType();
+ uint64_t I2Size = AliasAnalysis::UnknownSize;
+ Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType();
if (I2ElTy->isSized()) I2Size = AA.getTypeStoreSize(I2ElTy);
switch (AA.alias(*I1, I1Size, *I2, I2Size)) {
case AliasAnalysis::MayAlias:
PrintResults("MayAlias", PrintMayAlias, *I1, *I2, F.getParent());
++MayAlias; break;
+ case AliasAnalysis::PartialAlias:
+ PrintResults("PartialAlias", PrintPartialAlias, *I1, *I2,
+ F.getParent());
+ ++PartialAlias; break;
case AliasAnalysis::MustAlias:
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;
-
const Type *ElTy = cast<PointerType>((*V)->getType())->getElementType();
+ uint64_t Size = AliasAnalysis::UnknownSize;
+ Type *ElTy = cast<PointerType>((*V)->getType())->getElementType();
if (ElTy->isSized()) Size = AA.getTypeStoreSize(ElTy);
switch (AA.getModRefInfo(*C, *V, Size)) {
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("Just Ref", PrintRef, I, *V, F.getParent());
+ ++Ref; break;
+ case AliasAnalysis::ModRef:
+ PrintModRefResults("Both ModRef", PrintModRef, I, *V, F.getParent());
+ ++ModRef; break;
+ }
+ }
+ }
+
+ // 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(" Ref", PrintRef, I, *V, F.getParent());
+ PrintModRefResults("Just Ref", PrintRef, *C, *D, F.getParent());
++Ref; break;
case AliasAnalysis::ModRef:
- PrintModRefResults(" ModRef", PrintModRef, I, *V, F.getParent());
+ PrintModRefResults("Both ModRef", PrintModRef, *C, *D, F.getParent());
++ModRef; break;
- default:
- errs() << "Unknown alias query result!\n";
}
}
}
}
bool AAEval::doFinalization(Module &M) {
- unsigned AliasSum = NoAlias + MayAlias + MustAlias;
+ unsigned AliasSum = NoAlias + MayAlias + PartialAlias + MustAlias;
errs() << "===== Alias Analysis Evaluator Report =====\n";
if (AliasSum == 0) {
errs() << " Alias Analysis Evaluator Summary: No pointers!\n";
PrintPercent(NoAlias, AliasSum);
errs() << " " << MayAlias << " may alias responses ";
PrintPercent(MayAlias, AliasSum);
+ errs() << " " << PartialAlias << " partial alias responses ";
+ PrintPercent(PartialAlias, AliasSum);
errs() << " " << MustAlias << " must alias responses ";
PrintPercent(MustAlias, AliasSum);
errs() << " Alias Analysis Evaluator Pointer Alias Summary: "
<< NoAlias*100/AliasSum << "%/" << MayAlias*100/AliasSum << "%/"
+ << PartialAlias*100/AliasSum << "%/"
<< MustAlias*100/AliasSum << "%\n";
}
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