1 //===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements a pass which can be used to count how many alias queries
11 // are being made and how the alias analysis implementation being used responds.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Analysis/AliasAnalysis.h"
16 #include "llvm/Pass.h"
21 class AliasAnalysisCounter : public ModulePass, public AliasAnalysis {
22 unsigned No, May, Must;
23 unsigned NoMR, JustRef, JustMod, MR;
26 AliasAnalysisCounter() {
28 NoMR = JustRef = JustMod = MR = 0;
31 void printLine(const char *Desc, unsigned Val, unsigned Sum) {
32 std::cerr << " " << Val << " " << Desc << " responses ("
33 << Val*100/Sum << "%)\n";
35 ~AliasAnalysisCounter() {
36 unsigned AASum = No+May+Must;
37 unsigned MRSum = NoMR+JustRef+JustMod+MR;
38 if (AASum + MRSum) { // Print a report if any counted queries occurred...
40 << "\n===== Alias Analysis Counter Report =====\n"
41 << " Analysis counted: " << Name << "\n"
42 << " " << AASum << " Total Alias Queries Performed\n";
44 printLine("no alias", No, AASum);
45 printLine("may alias", May, AASum);
46 printLine("must alias", Must, AASum);
48 << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
49 << May*100/AASum << "%/" << Must*100/AASum<<"%\n\n";
53 << " " << MRSum << " Total Mod/Ref Queries Performed\n";
55 printLine("no mod/ref", NoMR, MRSum);
56 printLine("ref", JustRef, MRSum);
57 printLine("mod", JustMod, MRSum);
58 printLine("mod/ref", MR, MRSum);
60 << " Mod/Ref Analysis Counter Summary: " << NoMR*100/MRSum<< "%/"
61 << JustRef*100/MRSum << "%/" << JustMod*100/MRSum << "%/"
62 << MR*100/MRSum <<"%\n\n";
67 bool runOnModule(Module &M) {
68 InitializeAliasAnalysis(this);
69 Name = dynamic_cast<Pass*>(&getAnalysis<AliasAnalysis>())->getPassName();
73 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
74 AliasAnalysis::getAnalysisUsage(AU);
75 AU.addRequired<AliasAnalysis>();
79 AliasResult count(AliasResult R) {
81 default: assert(0 && "Unknown alias type!");
82 case NoAlias: No++; return NoAlias;
83 case MayAlias: May++; return MayAlias;
84 case MustAlias: Must++; return MustAlias;
87 ModRefResult count(ModRefResult R) {
89 default: assert(0 && "Unknown mod/ref type!");
90 case NoModRef: NoMR++; return NoModRef;
91 case Ref: JustRef++; return Ref;
92 case Mod: JustMod++; return Mod;
93 case ModRef: MR++; return ModRef;
97 // FIXME: We could count these too...
98 bool pointsToConstantMemory(const Value *P) {
99 return getAnalysis<AliasAnalysis>().pointsToConstantMemory(P);
101 bool doesNotAccessMemory(Function *F) {
102 return getAnalysis<AliasAnalysis>().doesNotAccessMemory(F);
104 bool onlyReadsMemory(Function *F) {
105 return getAnalysis<AliasAnalysis>().onlyReadsMemory(F);
109 // Forwarding functions: just delegate to a real AA implementation, counting
110 // the number of responses...
111 AliasResult alias(const Value *V1, unsigned V1Size,
112 const Value *V2, unsigned V2Size) {
113 return count(getAnalysis<AliasAnalysis>().alias(V1, V1Size, V2, V2Size));
115 ModRefResult getModRefInfo(CallSite CS, Value *P, unsigned Size) {
116 return count(getAnalysis<AliasAnalysis>().getModRefInfo(CS, P, Size));
120 RegisterOpt<AliasAnalysisCounter>
121 X("count-aa", "Count Alias Analysis Query Responses");
122 RegisterAnalysisGroup<AliasAnalysis, AliasAnalysisCounter> Y;