#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"
-#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SetVector.h"
using namespace llvm;
static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
namespace {
- class VISIBILITY_HIDDEN AAEval : public FunctionPass {
+ class AAEval : public FunctionPass {
unsigned NoAlias, MayAlias, MustAlias;
unsigned NoModRef, Mod, Ref, ModRef;
public:
static char ID; // Pass identification, replacement for typeid
- AAEval() : FunctionPass(&ID) {}
+ AAEval() : FunctionPass(ID) {}
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(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);
+}
+
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 ||
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:
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;
+ }
+ }
+ }
+
return false;
}