mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-28 14:36:34 +00:00
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
//===- AliasAnalysisEvaluator.cpp - Alias Analysis Accuracy Evaluator -----===//
|
|
//
|
|
// This file implements a simple N^2 alias analysis accuracy evaluator.
|
|
// Basically, for each function in the program, it simply queries to see how the
|
|
// alias analysis implementation answers alias queries between each pair of
|
|
// pointers in the function.
|
|
//
|
|
// This is inspired and adapted from code by: Naveen Neelakantam, Francesco
|
|
// Spadini, and Wojciech Stryjewski.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Analysis/AliasAnalysis.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Support/InstIterator.h"
|
|
#include "llvm/Type.h"
|
|
|
|
namespace {
|
|
class AAEval : public FunctionPass {
|
|
unsigned No, May, Must;
|
|
|
|
public:
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.addRequired<AliasAnalysis>();
|
|
AU.setPreservesAll();
|
|
}
|
|
|
|
bool doInitialization(Module &M) { No = May = Must = 0; return false; }
|
|
bool runOnFunction(Function &F);
|
|
bool doFinalization(Module &M);
|
|
};
|
|
|
|
RegisterOpt<AAEval>
|
|
X("aa-eval", "Exhaustive Alias Analysis Precision Evaluator");
|
|
}
|
|
|
|
bool AAEval::runOnFunction(Function &F) {
|
|
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
|
|
|
|
std::vector<Value *> Pointers;
|
|
|
|
for (Function::aiterator I = F.abegin(), E = F.aend(); I != E; ++I)
|
|
if (isa<PointerType>(I->getType())) // Add all pointer arguments
|
|
Pointers.push_back(I);
|
|
|
|
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I)
|
|
if (isa<PointerType>((*I)->getType())) // Add all pointer instructions
|
|
Pointers.push_back(*I);
|
|
|
|
// iterate over the worklist, and run the full (n^2)/2 disambiguations
|
|
for (std::vector<Value *>::iterator I1 = Pointers.begin(), E = Pointers.end();
|
|
I1 != E; ++I1)
|
|
for (std::vector<Value *>::iterator I2 = Pointers.begin(); I2 != I1; ++I2)
|
|
switch (AA.alias(*I1, *I2)) {
|
|
case AliasAnalysis::NoAlias: ++No; break;
|
|
case AliasAnalysis::MayAlias: ++May; break;
|
|
case AliasAnalysis::MustAlias: ++Must; break;
|
|
default:
|
|
std::cerr << "Unknown alias query result!\n";
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool AAEval::doFinalization(Module &M) {
|
|
unsigned Sum = No+May+Must;
|
|
std::cerr << "===== Alias Analysis Evaluator Report =====\n";
|
|
std::cerr << " " << Sum << " Total Alias Queries Performed\n";
|
|
std::cerr << " " << No << " no alias responses (" << No*100/Sum << "%)\n";
|
|
std::cerr << " " << May << " may alias responses (" << May*100/Sum << "%)\n";
|
|
std::cerr << " " << Must << " must alias responses (" <<Must*100/Sum<<"%)\n";
|
|
return false;
|
|
}
|