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Generalize AAEval so that it can be used both per-function and

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interprocedurally. Note that as of this writing, existing alias
analysis passes are not prepared to be used interprocedurally.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107013 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-06-28 16:01:37 +00:00
parent 062f7f10f9
commit 8d121694a3
2 changed files with 104 additions and 38 deletions
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7
include/llvm/Analysis/Passes.h
View File

@ -51,6 +51,13 @@ namespace llvm {
//
FunctionPass *createAAEvalPass();
//===--------------------------------------------------------------------===//
//
// createInterproceduralAAEvalPass - This pass implements a simple
// N^2 interprocedural alias analysis accuracy evaluator.
//
Pass *createInterproceduralAAEvalPass();
//===--------------------------------------------------------------------===//
//
// createNoAAPass - This pass implements a "I don't know" alias analysis.

135
lib/Analysis/AliasAnalysisEvaluator.cpp
View File

@ -21,11 +21,11 @@
#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"
#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"
@ -45,20 +45,21 @@ static cl::opt<bool> PrintRef("print-ref", cl::ReallyHidden);
static cl::opt<bool> PrintModRef("print-modref", cl::ReallyHidden);
namespace {
class AAEval : public FunctionPass {
/// AAEval - Base class for exhaustive alias analysis evaluators.
class AAEval {
protected:
unsigned NoAlias, MayAlias, MustAlias;
unsigned NoModRef, Mod, Ref, ModRef;
public:
static char ID; // Pass identification, replacement for typeid
AAEval() : FunctionPass(&ID) {}
SetVector<Value *> Pointers;
SetVector<CallSite> CallSites;
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<AliasAnalysis>();
AU.setPreservesAll();
}
bool doInitialization(Module &M) {
void doInitialization(Module &M) {
NoAlias = MayAlias = MustAlias = 0;
NoModRef = Mod = Ref = ModRef = 0;
@ -66,19 +67,85 @@ namespace {
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;
}
bool runOnFunction(Function &F);
bool doFinalization(Module &M);
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;
}
};
}
char AAEval::ID = 0;
static RegisterPass<AAEval>
char FunctionAAEval::ID = 0;
static RegisterPass<FunctionAAEval>
X("aa-eval", "Exhaustive Alias Analysis Precision Evaluator", false, true);
FunctionPass *llvm::createAAEvalPass() { return new AAEval(); }
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);
Pass *llvm::createInterproceduralAAEvalPass() {
return new InterproceduralAAEval();
}
static void PrintResults(const char *Msg, bool P, const Value *V1,
const Value *V2, const Module *M) {
@ -113,12 +180,7 @@ static inline bool isInterestingPointer(Value *V) {
&& !isa<ConstantPointerNull>(V);
}
bool AAEval::runOnFunction(Function &F) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
SetVector<Value *> Pointers;
SetVector<CallSite> CallSites;
void AAEval::runOnFunction(Function &F) {
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);
@ -148,33 +210,31 @@ bool AAEval::runOnFunction(Function &F) {
if (CS.getInstruction()) CallSites.insert(CS);
}
}
if (PrintNoAlias || PrintMayAlias || PrintMustAlias ||
PrintNoModRef || PrintMod || PrintRef || PrintModRef)
errs() << "Function: " << F.getName() << ": " << Pointers.size()
<< " pointers, " << CallSites.size() << " call sites\n";
void AAEval::evaluate(AliasAnalysis *AA, Module *M) {
// 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();
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;
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, F.getParent());
PrintResults("NoAlias", PrintNoAlias, *I1, *I2, M);
++NoAlias; break;
case AliasAnalysis::MayAlias:
PrintResults("MayAlias", PrintMayAlias, *I1, *I2, F.getParent());
PrintResults("MayAlias", PrintMayAlias, *I1, *I2, M);
++MayAlias; break;
case AliasAnalysis::MustAlias:
PrintResults("MustAlias", PrintMustAlias, *I1, *I2, F.getParent());
PrintResults("MustAlias", PrintMustAlias, *I1, *I2, M);
++MustAlias; break;
default:
errs() << "Unknown alias query result!\n";
@ -191,20 +251,20 @@ bool AAEval::runOnFunction(Function &F) {
V != Ve; ++V) {
unsigned Size = ~0u;
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, F.getParent());
PrintModRefResults("NoModRef", PrintNoModRef, I, *V, M);
++NoModRef; break;
case AliasAnalysis::Mod:
PrintModRefResults(" Mod", PrintMod, I, *V, F.getParent());
PrintModRefResults(" Mod", PrintMod, I, *V, M);
++Mod; break;
case AliasAnalysis::Ref:
PrintModRefResults(" Ref", PrintRef, I, *V, F.getParent());
PrintModRefResults(" Ref", PrintRef, I, *V, M);
++Ref; break;
case AliasAnalysis::ModRef:
PrintModRefResults(" ModRef", PrintModRef, I, *V, F.getParent());
PrintModRefResults(" ModRef", PrintModRef, I, *V, M);
++ModRef; break;
default:
errs() << "Unknown alias query result!\n";
@ -212,7 +272,8 @@ bool AAEval::runOnFunction(Function &F) {
}
}
return false;
Pointers.clear();
CallSites.clear();
}
static void PrintPercent(unsigned Num, unsigned Sum) {
@ -220,7 +281,7 @@ static void PrintPercent(unsigned Num, unsigned Sum) {
<< ((Num*1000ULL/Sum) % 10) << "%)\n";
}
bool AAEval::doFinalization(Module &M) {
void AAEval::doFinalization(Module &M) {
unsigned AliasSum = NoAlias + MayAlias + MustAlias;
errs() << "===== Alias Analysis Evaluator Report =====\n";
if (AliasSum == 0) {
@ -256,6 +317,4 @@ bool AAEval::doFinalization(Module &M) {
<< NoModRef*100/ModRefSum << "%/" << Mod*100/ModRefSum << "%/"
<< Ref*100/ModRefSum << "%/" << ModRef*100/ModRefSum << "%\n";
}
return false;
}