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;
15 unsigned NoMR, JustRef, JustMod, MR;
18 AliasAnalysisCounter() {
20 NoMR = JustRef = JustMod = MR = 0;
23 void printLine(const char *Desc, unsigned Val, unsigned Sum) {
24 std::cerr << " " << Val << " " << Desc << " responses ("
25 << Val*100/Sum << "%)\n";
27 ~AliasAnalysisCounter() {
28 unsigned AASum = No+May+Must;
29 unsigned MRSum = NoMR+JustRef+JustMod+MR;
30 if (AASum + MRSum) { // Print a report if any counted queries occurred...
32 << "\n===== Alias Analysis Counter Report =====\n"
33 << " Analysis counted: " << Name << "\n"
34 << " " << AASum << " Total Alias Queries Performed\n";
35 printLine("no alias", No, AASum);
36 printLine("may alias", May, AASum);
37 printLine("must alias", Must, AASum);
39 << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
40 << May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
43 << " " << MRSum << " Total Mod/Ref Queries Performed\n";
44 printLine("no mod/ref", NoMR, MRSum);
45 printLine("ref", JustRef, MRSum);
46 printLine("mod", JustMod, MRSum);
47 printLine("mod/ref", MR, MRSum);
49 << " Mod/Ref Analysis Counter Summary: " << NoMR*100/MRSum<< "%/"
50 << JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
51 << MR*100/MRSum <<"%\n\n";
56 InitializeAliasAnalysis(this);
57 Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
61 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
62 AliasAnalysis::getAnalysisUsage(AU);
63 AU.addRequired<AliasAnalysis>();
67 AliasResult count(AliasResult R) {
69 default: assert(0 && "Unknown alias type!");
70 case NoAlias: No++; return NoAlias;
71 case MayAlias: May++; return MayAlias;
72 case MustAlias: Must++; return MustAlias;
75 ModRefResult count(ModRefResult R) {
77 default: assert(0 && "Unknown mod/ref type!");
78 case NoModRef: NoMR++; return NoModRef;
79 case Ref: JustRef++; return Ref;
80 case Mod: JustMod++; return Mod;
81 case ModRef: MR++; return ModRef;
85 // Forwarding functions: just delegate to a real AA implementation, counting
86 // the number of responses...
87 AliasResult alias(const Value *V1, unsigned V1Size,
88 const Value *V2, unsigned V2Size) {
89 return count(getAnalysis<AliasAnalysis>().alias(V1, V1Size, V2, V2Size));
91 ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
92 return count(getAnalysis<AliasAnalysis>().getModRefInfo(CS, P, Size));
96 RegisterOpt<AliasAnalysisCounter>
97 X("count-aa", "Count Alias Analysis Query Responses");
98 RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;