//
//===----------------------------------------------------------------------===//
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/Function.h"
-#include "llvm/Instructions.h"
-#include "llvm/Pass.h"
#include "llvm/Analysis/Passes.h"
+#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Assembly/Writer.h"
-#include "llvm/Target/TargetData.h"
-#include "llvm/Support/InstIterator.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/InstIterator.h"
#include "llvm/Support/raw_ostream.h"
-#include <set>
-#include <sstream>
using namespace llvm;
static cl::opt<bool> PrintAll("print-all-alias-modref-info", cl::ReallyHidden);
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);
static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden);
static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
+static cl::opt<bool> EvalTBAA("evaluate-tbaa", cl::ReallyHidden);
+
namespace {
- class VISIBILITY_HIDDEN AAEval : public FunctionPass {
- unsigned NoAlias, MayAlias, MustAlias;
+ class AAEval : public FunctionPass {
+ 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 void PrintResults(const char *Msg, bool P, const Value *V1, const Value *V2,
- const Module *M) {
+static void PrintResults(const char *Msg, bool P, const Value *V1,
+ const Value *V2, const Module *M) {
if (P) {
- std::stringstream s1, s2;
- WriteAsOperand(s1, V1, true, M);
- WriteAsOperand(s2, V2, true, M);
- std::string o1(s1.str()), o2(s2.str());
+ std::string o1, o2;
+ {
+ raw_string_ostream os1(o1), os2(o2);
+ V1->printAsOperand(os1, true, M);
+ V2->printAsOperand(os2, true, M);
+ }
+
if (o2 < o1)
std::swap(o1, o2);
errs() << " " << Msg << ":\t"
Module *M) {
if (P) {
errs() << " " << Msg << ": Ptr: ";
- WriteAsOperand(errs(), Ptr, true, M);
- errs() << "\t<->" << *I;
+ Ptr->printAsOperand(errs(), 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 void
+PrintLoadStoreResults(const char *Msg, bool P, const Value *V1,
+ const Value *V2, const Module *M) {
+ if (P) {
+ errs() << " " << Msg << ": " << *V1
+ << " <-> " << *V2 << '\n';
+ }
+}
+
+static inline bool isInterestingPointer(Value *V) {
+ return V->getType()->isPointerTy()
+ && !isa<ConstantPointerNull>(V);
+}
+
bool AAEval::runOnFunction(Function &F) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
- std::set<Value *> Pointers;
- std::set<CallSite> CallSites;
+ SetVector<Value *> Pointers;
+ SetVector<CallSite> CallSites;
+ SetVector<Value *> Loads;
+ SetVector<Value *> Stores;
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);
+ if (EvalTBAA && isa<LoadInst>(&*I))
+ Loads.insert(&*I);
+ if (EvalTBAA && isa<StoreInst>(&*I))
+ Stores.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 ||
+ 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 (std::set<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end();
+ 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 (std::set<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) {
- unsigned I2Size = ~0u;
- const Type *I2ElTy =cast<PointerType>((*I2)->getType())->getElementType();
+ for (SetVector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2) {
+ 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";
+ }
+ }
+ }
+
+ if (EvalTBAA) {
+ // iterate over all pairs of load, store
+ for (SetVector<Value *>::iterator I1 = Loads.begin(), E = Loads.end();
+ I1 != E; ++I1) {
+ for (SetVector<Value *>::iterator I2 = Stores.begin(), E2 = Stores.end();
+ I2 != E2; ++I2) {
+ switch (AA.alias(AA.getLocation(cast<LoadInst>(*I1)),
+ AA.getLocation(cast<StoreInst>(*I2)))) {
+ case AliasAnalysis::NoAlias:
+ PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2,
+ F.getParent());
+ ++NoAlias; break;
+ case AliasAnalysis::MayAlias:
+ PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2,
+ F.getParent());
+ ++MayAlias; break;
+ case AliasAnalysis::PartialAlias:
+ PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2,
+ F.getParent());
+ ++PartialAlias; break;
+ case AliasAnalysis::MustAlias:
+ PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2,
+ F.getParent());
+ ++MustAlias; break;
+ }
+ }
+ }
+
+ // iterate over all pairs of store, store
+ for (SetVector<Value *>::iterator I1 = Stores.begin(), E = Stores.end();
+ I1 != E; ++I1) {
+ for (SetVector<Value *>::iterator I2 = Stores.begin(); I2 != I1; ++I2) {
+ switch (AA.alias(AA.getLocation(cast<StoreInst>(*I1)),
+ AA.getLocation(cast<StoreInst>(*I2)))) {
+ case AliasAnalysis::NoAlias:
+ PrintLoadStoreResults("NoAlias", PrintNoAlias, *I1, *I2,
+ F.getParent());
+ ++NoAlias; break;
+ case AliasAnalysis::MayAlias:
+ PrintLoadStoreResults("MayAlias", PrintMayAlias, *I1, *I2,
+ F.getParent());
+ ++MayAlias; break;
+ case AliasAnalysis::PartialAlias:
+ PrintLoadStoreResults("PartialAlias", PrintPartialAlias, *I1, *I2,
+ F.getParent());
+ ++PartialAlias; break;
+ case AliasAnalysis::MustAlias:
+ PrintLoadStoreResults("MustAlias", PrintMustAlias, *I1, *I2,
+ F.getParent());
+ ++MustAlias; break;
+ }
}
}
}
// Mod/ref alias analysis: compare all pairs of calls and values
- for (std::set<CallSite>::iterator C = CallSites.begin(),
+ for (SetVector<CallSite>::iterator C = CallSites.begin(),
Ce = CallSites.end(); C != Ce; ++C) {
Instruction *I = C->getInstruction();
- for (std::set<Value *>::iterator V = Pointers.begin(), Ve = Pointers.end();
+ 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";
}