mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-24 09:29:42 +00:00
preparation for de-coupling the AA implementations. In order to do this, they had to become fake-scoped using the traditional LLVM pattern of a leading initialism. These can't be actual scoped enumerations because they're bitfields and thus inherently we use them as integers. I've also renamed the behavior enums that are specific to reasoning about the mod/ref behavior of functions when called. This makes it more clear that they have a very narrow domain of applicability. I think there is a significantly cleaner API for all of this, but I don't want to try to do really substantive changes for now, I just want to refactor the things away from analysis groups so I'm preserving the exact original design and just cleaning up the names, style, and lifting out of the class. Differential Revision: http://reviews.llvm.org/D10564 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242963 91177308-0d34-0410-b5e6-96231b3b80d8
186 lines
6.4 KiB
C++
186 lines
6.4 KiB
C++
//===- 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/IR/Module.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() override {
|
|
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 MRI_Mod/MRI_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() << " MRI_Mod/MRI_Ref Analysis Counter Summary: "
|
|
<< NoMR * 100 / MRSum << "%/" << JustRef * 100 / MRSum << "%/"
|
|
<< JustMod * 100 / MRSum << "%/" << MR * 100 / MRSum
|
|
<< "%\n\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
bool runOnModule(Module &M) override {
|
|
this->M = &M;
|
|
InitializeAliasAnalysis(this, &M.getDataLayout());
|
|
return false;
|
|
}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
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.
|
|
void *getAdjustedAnalysisPointer(AnalysisID PI) override {
|
|
if (PI == &AliasAnalysis::ID)
|
|
return (AliasAnalysis*)this;
|
|
return this;
|
|
}
|
|
|
|
// FIXME: We could count these too...
|
|
bool pointsToConstantMemory(const MemoryLocation &Loc,
|
|
bool OrLocal) override {
|
|
return getAnalysis<AliasAnalysis>().pointsToConstantMemory(Loc, OrLocal);
|
|
}
|
|
|
|
// Forwarding functions: just delegate to a real AA implementation, counting
|
|
// the number of responses...
|
|
AliasResult alias(const MemoryLocation &LocA,
|
|
const MemoryLocation &LocB) override;
|
|
|
|
ModRefInfo getModRefInfo(ImmutableCallSite CS,
|
|
const MemoryLocation &Loc) override;
|
|
ModRefInfo getModRefInfo(ImmutableCallSite CS1,
|
|
ImmutableCallSite CS2) override {
|
|
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();
|
|
}
|
|
|
|
AliasResult AliasAnalysisCounter::alias(const MemoryLocation &LocA,
|
|
const MemoryLocation &LocB) {
|
|
AliasResult R = getAnalysis<AliasAnalysis>().alias(LocA, LocB);
|
|
|
|
const char *AliasString = nullptr;
|
|
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] ";
|
|
LocA.Ptr->printAsOperand(errs(), true, M);
|
|
errs() << ", ";
|
|
errs() << "[" << LocB.Size << "B] ";
|
|
LocB.Ptr->printAsOperand(errs(), true, M);
|
|
errs() << "\n";
|
|
}
|
|
|
|
return R;
|
|
}
|
|
|
|
ModRefInfo AliasAnalysisCounter::getModRefInfo(ImmutableCallSite CS,
|
|
const MemoryLocation &Loc) {
|
|
ModRefInfo R = getAnalysis<AliasAnalysis>().getModRefInfo(CS, Loc);
|
|
|
|
const char *MRString = nullptr;
|
|
switch (R) {
|
|
case MRI_NoModRef:
|
|
NoMR++;
|
|
MRString = "MRI_NoModRef";
|
|
break;
|
|
case MRI_Ref:
|
|
JustRef++;
|
|
MRString = "JustRef";
|
|
break;
|
|
case MRI_Mod:
|
|
JustMod++;
|
|
MRString = "JustMod";
|
|
break;
|
|
case MRI_ModRef:
|
|
MR++;
|
|
MRString = "MRI_ModRef";
|
|
break;
|
|
}
|
|
|
|
if (PrintAll || (PrintAllFailures && R == MRI_ModRef)) {
|
|
errs() << MRString << ": Ptr: ";
|
|
errs() << "[" << Loc.Size << "B] ";
|
|
Loc.Ptr->printAsOperand(errs(), true, M);
|
|
errs() << "\t<->" << *CS.getInstruction() << '\n';
|
|
}
|
|
return R;
|
|
}
|