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https://github.com/c64scene-ar/llvm-6502.git
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c94da20917
Summary: DataLayout keeps the string used for its creation. As a side effect it is no longer needed in the Module. This is "almost" NFC, the string is no longer canonicalized, you can't rely on two "equals" DataLayout having the same string returned by getStringRepresentation(). Get rid of DataLayoutPass: the DataLayout is in the Module The DataLayout is "per-module", let's enforce this by not duplicating it more than necessary. One more step toward non-optionality of the DataLayout in the module. Make DataLayout Non-Optional in the Module Module->getDataLayout() will never returns nullptr anymore. Reviewers: echristo Subscribers: resistor, llvm-commits, jholewinski Differential Revision: http://reviews.llvm.org/D7992 From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231270 91177308-0d34-0410-b5e6-96231b3b80d8
172 lines
6.2 KiB
C++
172 lines
6.2 KiB
C++
//===- AliasAnalysisCounter.cpp - Alias Analysis Query Counter ------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a pass which can be used to count how many alias queries
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// are being made and how the alias analysis implementation being used responds.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static cl::opt<bool>
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PrintAll("count-aa-print-all-queries", cl::ReallyHidden, cl::init(true));
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static cl::opt<bool>
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PrintAllFailures("count-aa-print-all-failed-queries", cl::ReallyHidden);
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namespace {
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class AliasAnalysisCounter : public ModulePass, public AliasAnalysis {
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unsigned No, May, Partial, Must;
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unsigned NoMR, JustRef, JustMod, MR;
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Module *M;
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public:
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static char ID; // Class identification, replacement for typeinfo
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AliasAnalysisCounter() : ModulePass(ID) {
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initializeAliasAnalysisCounterPass(*PassRegistry::getPassRegistry());
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No = May = Partial = Must = 0;
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NoMR = JustRef = JustMod = MR = 0;
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}
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void printLine(const char *Desc, unsigned Val, unsigned Sum) {
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errs() << " " << Val << " " << Desc << " responses ("
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<< Val*100/Sum << "%)\n";
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}
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~AliasAnalysisCounter() {
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unsigned AASum = No+May+Partial+Must;
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unsigned MRSum = NoMR+JustRef+JustMod+MR;
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if (AASum + MRSum) { // Print a report if any counted queries occurred...
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errs() << "\n===== Alias Analysis Counter Report =====\n"
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<< " Analysis counted:\n"
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<< " " << AASum << " Total Alias Queries Performed\n";
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if (AASum) {
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printLine("no alias", No, AASum);
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printLine("may alias", May, AASum);
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printLine("partial alias", Partial, AASum);
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printLine("must alias", Must, AASum);
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errs() << " Alias Analysis Counter Summary: " << No*100/AASum << "%/"
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<< May*100/AASum << "%/"
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<< Partial*100/AASum << "%/"
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<< Must*100/AASum<<"%\n\n";
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}
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errs() << " " << MRSum << " Total Mod/Ref Queries Performed\n";
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if (MRSum) {
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printLine("no mod/ref", NoMR, MRSum);
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printLine("ref", JustRef, MRSum);
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printLine("mod", JustMod, MRSum);
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printLine("mod/ref", MR, MRSum);
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errs() << " Mod/Ref Analysis Counter Summary: " <<NoMR*100/MRSum
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<< "%/" << JustRef*100/MRSum << "%/" << JustMod*100/MRSum
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<< "%/" << MR*100/MRSum <<"%\n\n";
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}
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}
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}
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bool runOnModule(Module &M) override {
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this->M = &M;
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InitializeAliasAnalysis(this, &M.getDataLayout());
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return false;
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AliasAnalysis::getAnalysisUsage(AU);
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AU.addRequired<AliasAnalysis>();
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AU.setPreservesAll();
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}
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/// getAdjustedAnalysisPointer - This method is used when a pass implements
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/// an analysis interface through multiple inheritance. If needed, it
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/// should override this to adjust the this pointer as needed for the
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/// specified pass info.
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void *getAdjustedAnalysisPointer(AnalysisID PI) override {
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if (PI == &AliasAnalysis::ID)
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return (AliasAnalysis*)this;
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return this;
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}
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// FIXME: We could count these too...
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bool pointsToConstantMemory(const Location &Loc, bool OrLocal) override {
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return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal);
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}
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// Forwarding functions: just delegate to a real AA implementation, counting
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// the number of responses...
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AliasResult alias(const Location &LocA, const Location &LocB) override;
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ModRefResult getModRefInfo(ImmutableCallSite CS,
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const Location &Loc) override;
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ModRefResult getModRefInfo(ImmutableCallSite CS1,
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ImmutableCallSite CS2) override {
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return AliasAnalysis::getModRefInfo(CS1,CS2);
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}
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};
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}
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char AliasAnalysisCounter::ID = 0;
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INITIALIZE_AG_PASS(AliasAnalysisCounter, AliasAnalysis, "count-aa",
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"Count Alias Analysis Query Responses", false, true, false)
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ModulePass *llvm::createAliasAnalysisCounterPass() {
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return new AliasAnalysisCounter();
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}
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AliasAnalysis::AliasResult
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AliasAnalysisCounter::alias(const Location &LocA, const Location &LocB) {
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AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB);
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const char *AliasString = nullptr;
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switch (R) {
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case NoAlias: No++; AliasString = "No alias"; break;
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case MayAlias: May++; AliasString = "May alias"; break;
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case PartialAlias: Partial++; AliasString = "Partial alias"; break;
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case MustAlias: Must++; AliasString = "Must alias"; break;
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}
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if (PrintAll || (PrintAllFailures && R == MayAlias)) {
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errs() << AliasString << ":\t";
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errs() << "[" << LocA.Size << "B] ";
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LocA.Ptr->printAsOperand(errs(), true, M);
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errs() << ", ";
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errs() << "[" << LocB.Size << "B] ";
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LocB.Ptr->printAsOperand(errs(), true, M);
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errs() << "\n";
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}
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return R;
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}
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AliasAnalysis::ModRefResult
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AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
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const Location &Loc) {
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ModRefResult R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
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const char *MRString = nullptr;
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switch (R) {
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case NoModRef: NoMR++; MRString = "NoModRef"; break;
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case Ref: JustRef++; MRString = "JustRef"; break;
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case Mod: JustMod++; MRString = "JustMod"; break;
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case ModRef: MR++; MRString = "ModRef"; break;
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}
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if (PrintAll || (PrintAllFailures && R == ModRef)) {
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errs() << MRString << ": Ptr: ";
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errs() << "[" << Loc.Size << "B] ";
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Loc.Ptr->printAsOperand(errs(), true, M);
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errs() << "\t<->" << *CS.getInstruction() << '\n';
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}
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return R;
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}
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