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//===- MemDepPrinter.cpp - Printer for MemoryDependenceAnalysis -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/SetVector.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/Instructions.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
struct MemDepPrinter : public FunctionPass {
const Function *F;
enum DepType {
Clobber = 0,
Def,
NonFuncLocal,
Unknown
};
static const char *const DepTypeStr[];
typedef PointerIntPair<const Instruction *, 2, DepType> InstTypePair;
typedef std::pair<InstTypePair, const BasicBlock *> Dep;
typedef SmallSetVector<Dep, 4> DepSet;
typedef DenseMap<const Instruction *, DepSet> DepSetMap;
DepSetMap Deps;
static char ID; // Pass identifcation, replacement for typeid
MemDepPrinter() : FunctionPass(ID) {
initializeMemDepPrinterPass(*PassRegistry::getPassRegistry());
}
bool runOnFunction(Function &F) override;
void print(raw_ostream &OS, const Module * = nullptr) const override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequiredTransitive<AAResultsWrapperPass>();
AU.addRequiredTransitive<MemoryDependenceWrapperPass>();
AU.setPreservesAll();
}
void releaseMemory() override {
Deps.clear();
F = nullptr;
}
private:
static InstTypePair getInstTypePair(MemDepResult dep) {
if (dep.isClobber())
return InstTypePair(dep.getInst(), Clobber);
if (dep.isDef())
return InstTypePair(dep.getInst(), Def);
if (dep.isNonFuncLocal())
return InstTypePair(dep.getInst(), NonFuncLocal);
assert(dep.isUnknown() && "unexpected dependence type");
return InstTypePair(dep.getInst(), Unknown);
}
};
}
char MemDepPrinter::ID = 0;
INITIALIZE_PASS_BEGIN(MemDepPrinter, "print-memdeps",
"Print MemDeps of function", false, true)
INITIALIZE_PASS_DEPENDENCY(MemoryDependenceWrapperPass)
INITIALIZE_PASS_END(MemDepPrinter, "print-memdeps",
"Print MemDeps of function", false, true)
FunctionPass *llvm::createMemDepPrinter() {
return new MemDepPrinter();
}
const char *const MemDepPrinter::DepTypeStr[]
= {"Clobber", "Def", "NonFuncLocal", "Unknown"};
bool MemDepPrinter::runOnFunction(Function &F) {
this->F = &F;
MemoryDependenceResults &MDA = getAnalysis<MemoryDependenceWrapperPass>().getMemDep();
// All this code uses non-const interfaces because MemDep is not
// const-friendly, though nothing is actually modified.
for (auto &I : instructions(F)) {
Instruction *Inst = &I;
if (!Inst->mayReadFromMemory() && !Inst->mayWriteToMemory())
continue;
MemDepResult Res = MDA.getDependency(Inst);
if (!Res.isNonLocal()) {
Deps[Inst].insert(std::make_pair(getInstTypePair(Res),
static_cast<BasicBlock *>(nullptr)));
} else if (auto *Call = dyn_cast<CallBase>(Inst)) {
const MemoryDependenceResults::NonLocalDepInfo &NLDI =
MDA.getNonLocalCallDependency(Call);
DepSet &InstDeps = Deps[Inst];
for (const NonLocalDepEntry &I : NLDI) {
const MemDepResult &Res = I.getResult();
InstDeps.insert(std::make_pair(getInstTypePair(Res), I.getBB()));
}
} else {
SmallVector<NonLocalDepResult, 4> NLDI;
assert( (isa<LoadInst>(Inst) || isa<StoreInst>(Inst) ||
isa<VAArgInst>(Inst)) && "Unknown memory instruction!");
MDA.getNonLocalPointerDependency(Inst, NLDI);
DepSet &InstDeps = Deps[Inst];
for (const NonLocalDepResult &I : NLDI) {
const MemDepResult &Res = I.getResult();
InstDeps.insert(std::make_pair(getInstTypePair(Res), I.getBB()));
}
}
}
return false;
}
void MemDepPrinter::print(raw_ostream &OS, const Module *M) const {
for (const auto &I : instructions(*F)) {
const Instruction *Inst = &I;
DepSetMap::const_iterator DI = Deps.find(Inst);
if (DI == Deps.end())
continue;
const DepSet &InstDeps = DI->second;
for (const auto &I : InstDeps) {
const Instruction *DepInst = I.first.getPointer();
DepType type = I.first.getInt();
const BasicBlock *DepBB = I.second;
OS << " ";
OS << DepTypeStr[type];
if (DepBB) {
OS << " in block ";
DepBB->printAsOperand(OS, /*PrintType=*/false, M);
}
if (DepInst) {
OS << " from: ";
DepInst->print(OS);
}
OS << "\n";
}
Inst->print(OS);
OS << "\n\n";
}
}
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