1 //===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
3 // This file implements a pass which can be used to count how many alias queries
4 // are being made and how the alias analysis implementation being used responds.
6 //===----------------------------------------------------------------------===//
8 #include "llvm/Analysis/AliasAnalysis.h"
13 class AliasAnalysisCounter : public Pass, public AliasAnalysis {
14 unsigned No, May, Must;
17 AliasAnalysisCounter() : No(0), May(0), Must(0) {}
18 ~AliasAnalysisCounter() {
19 unsigned Sum = No+May+Must;
20 if (Sum) { // Print a report if any counted queries occurred...
22 << "\n===== Alias Analysis Counter Report =====\n"
23 << " Analysis counted: " << Name << "\n"
24 << " " << Sum << " Total Alias Queries Performed\n"
25 << " " << No << " no alias responses (" << No*100/Sum << "%)\n"
26 << " " << May << " may alias responses (" << May*100/Sum << "%)\n"
27 << " " << Must << " must alias responses (" <<Must*100/Sum<<"%)\n"
28 << " Alias Analysis Counter Summary: " << No*100/Sum << "%/"
29 << May*100/Sum << "%/" << Must*100/Sum<<"%\n\n";
34 Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
38 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
39 AU.addRequired<AliasAnalysis>();
43 Result count(Result R) {
45 default: assert(0 && "Unknown alias type!");
46 case NoAlias: No++; return NoAlias;
47 case MayAlias: May++; return MayAlias;
48 case MustAlias: Must++; return MustAlias;
52 // Forwarding functions: just delegate to a real AA implementation, counting
53 // the number of responses...
54 Result alias(const Value *V1, const Value *V2) {
55 return count(getAnalysis<AliasAnalysis>().alias(V1, V2));
57 Result canCallModify(const CallInst &CI, const Value *Ptr) {
58 return count(getAnalysis<AliasAnalysis>().canCallModify(CI, Ptr));
60 Result canInvokeModify(const InvokeInst &I, const Value *Ptr) {
61 return count(getAnalysis<AliasAnalysis>().canInvokeModify(I, Ptr));
65 RegisterOpt<AliasAnalysisCounter>
66 X("count-aa", "Count Alias Analysis Query Responses");
67 RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;