diff options
Diffstat (limited to 'contrib/llvm/lib/Analysis/AliasAnalysisCounter.cpp')
| -rw-r--r-- | contrib/llvm/lib/Analysis/AliasAnalysisCounter.cpp | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Analysis/AliasAnalysisCounter.cpp b/contrib/llvm/lib/Analysis/AliasAnalysisCounter.cpp new file mode 100644 index 000000000000..9f4a47c77e03 --- /dev/null +++ b/contrib/llvm/lib/Analysis/AliasAnalysisCounter.cpp @@ -0,0 +1,171 @@ +//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements a pass which can be used to count how many alias queries +// are being made and how the alias analysis implementation being used responds. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Analysis/Passes.h" +#include "llvm/Analysis/AliasAnalysis.h" +#include "llvm/Assembly/Writer.h" +#include "llvm/Pass.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/raw_ostream.h" +using namespace llvm; + +static cl::opt<bool> +PrintAll("count-aa-print-all-queries", cl::ReallyHidden, cl::init(true)); +static cl::opt<bool> +PrintAllFailures("count-aa-print-all-failed-queries", cl::ReallyHidden); + +namespace { + class AliasAnalysisCounter : public ModulePass, public AliasAnalysis { + unsigned No, May, Partial, Must; + unsigned NoMR, JustRef, JustMod, MR; + Module *M; + public: + static char ID; // Class identification, replacement for typeinfo + AliasAnalysisCounter() : ModulePass(ID) { + initializeAliasAnalysisCounterPass(*PassRegistry::getPassRegistry()); + No = May = Partial = Must = 0; + NoMR = JustRef = JustMod = MR = 0; + } + + void printLine(const char *Desc, unsigned Val, unsigned Sum) { + errs() << " " << Val << " " << Desc << " responses (" + << Val*100/Sum << "%)\n"; + } + ~AliasAnalysisCounter() { + unsigned AASum = No+May+Partial+Must; + unsigned MRSum = NoMR+JustRef+JustMod+MR; + if (AASum + MRSum) { // Print a report if any counted queries occurred... + errs() << "\n===== Alias Analysis Counter Report =====\n" + << " Analysis counted:\n" + << " " << AASum << " Total Alias Queries Performed\n"; + if (AASum) { + printLine("no alias", No, AASum); + printLine("may alias", May, AASum); + printLine("partial alias", Partial, AASum); + printLine("must alias", Must, AASum); + errs() << " Alias Analysis Counter Summary: " << No*100/AASum << "%/" + << May*100/AASum << "%/" + << Partial*100/AASum << "%/" + << Must*100/AASum<<"%\n\n"; + } + + errs() << " " << MRSum << " Total Mod/Ref Queries Performed\n"; + if (MRSum) { + printLine("no mod/ref", NoMR, MRSum); + printLine("ref", JustRef, MRSum); + printLine("mod", JustMod, MRSum); + printLine("mod/ref", MR, MRSum); + errs() << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum + << "%/" << JustRef*100/MRSum << "%/" << JustMod*100/MRSum + << "%/" << MR*100/MRSum <<"%\n\n"; + } + } + } + + bool runOnModule(Module &M) { + this->M = &M; + InitializeAliasAnalysis(this); + return false; + } + + virtual void getAnalysisUsage(AnalysisUsage &AU) const { + AliasAnalysis::getAnalysisUsage(AU); + AU.addRequired<AliasAnalysis>(); + AU.setPreservesAll(); + } + + /// getAdjustedAnalysisPointer - This method is used when a pass implements + /// an analysis interface through multiple inheritance. If needed, it + /// should override this to adjust the this pointer as needed for the + /// specified pass info. + virtual void *getAdjustedAnalysisPointer(AnalysisID PI) { + if (PI == &AliasAnalysis::ID) + return (AliasAnalysis*)this; + return this; + } + + // FIXME: We could count these too... + bool pointsToConstantMemory(const Location &Loc, bool OrLocal) { + return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal); + } + + // Forwarding functions: just delegate to a real AA implementation, counting + // the number of responses... + AliasResult alias(const Location &LocA, const Location &LocB); + + ModRefResult getModRefInfo(ImmutableCallSite CS, + const Location &Loc); + ModRefResult getModRefInfo(ImmutableCallSite CS1, + ImmutableCallSite CS2) { + return AliasAnalysis::getModRefInfo(CS1,CS2); + } + }; +} + +char AliasAnalysisCounter::ID = 0; +INITIALIZE_AG_PASS(AliasAnalysisCounter, AliasAnalysis, "count-aa", + "Count Alias Analysis Query Responses", false, true, false) + +ModulePass *llvm::createAliasAnalysisCounterPass() { + return new AliasAnalysisCounter(); +} + +AliasAnalysis::AliasResult +AliasAnalysisCounter::alias(const Location &LocA, const Location &LocB) { + AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB); + + const char *AliasString = 0; + switch (R) { + case NoAlias: No++; AliasString = "No alias"; break; + case MayAlias: May++; AliasString = "May alias"; break; + case PartialAlias: Partial++; AliasString = "Partial alias"; break; + case MustAlias: Must++; AliasString = "Must alias"; break; + } + + if (PrintAll || (PrintAllFailures && R == MayAlias)) { + errs() << AliasString << ":\t"; + errs() << "[" << LocA.Size << "B] "; + WriteAsOperand(errs(), LocA.Ptr, true, M); + errs() << ", "; + errs() << "[" << LocB.Size << "B] "; + WriteAsOperand(errs(), LocB.Ptr, true, M); + errs() << "\n"; + } + + return R; +} + +AliasAnalysis::ModRefResult +AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS, + const Location &Loc) { + ModRefResult R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc); + + const char *MRString = 0; + switch (R) { + case NoModRef: NoMR++; MRString = "NoModRef"; break; + case Ref: JustRef++; MRString = "JustRef"; break; + case Mod: JustMod++; MRString = "JustMod"; break; + case ModRef: MR++; MRString = "ModRef"; break; + } + + if (PrintAll || (PrintAllFailures && R == ModRef)) { + errs() << MRString << ": Ptr: "; + errs() << "[" << Loc.Size << "B] "; + WriteAsOperand(errs(), Loc.Ptr, true, M); + errs() << "\t<->" << *CS.getInstruction() << '\n'; + } + return R; +} |