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//===- MemDepPrinter.cpp - Printer for MemoryDependenceAnalysis -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/LLVMContext.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/Support/CallSite.h"
#include "llvm/Support/InstIterator.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SetVector.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());
}
virtual bool runOnFunction(Function &F);
void print(raw_ostream &OS, const Module * = 0) const;
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredTransitive<AliasAnalysis>();
AU.addRequiredTransitive<MemoryDependenceAnalysis>();
AU.setPreservesAll();
}
virtual void releaseMemory() {
Deps.clear();
F = 0;
}
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() && "unexptected dependence type");
return InstTypePair(dep.getInst(), Unknown);
}
static InstTypePair getInstTypePair(const Instruction* inst, DepType type) {
return InstTypePair(inst, type);
}
};
}
char MemDepPrinter::ID = 0;
INITIALIZE_PASS_BEGIN(MemDepPrinter, "print-memdeps",
"Print MemDeps of function", false, true)
INITIALIZE_PASS_DEPENDENCY(MemoryDependenceAnalysis)
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;
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
MemoryDependenceAnalysis &MDA = getAnalysis<MemoryDependenceAnalysis>();
// All this code uses non-const interfaces because MemDep is not
// const-friendly, though nothing is actually modified.
for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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 *>(0)));
} else if (CallSite CS = cast<Value>(Inst)) {
const MemoryDependenceAnalysis::NonLocalDepInfo &NLDI =
MDA.getNonLocalCallDependency(CS);
DepSet &InstDeps = Deps[Inst];
for (MemoryDependenceAnalysis::NonLocalDepInfo::const_iterator
I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
const MemDepResult &Res = I->getResult();
InstDeps.insert(std::make_pair(getInstTypePair(Res), I->getBB()));
}
} else {
SmallVector<NonLocalDepResult, 4> NLDI;
if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
if (!LI->isUnordered()) {
// FIXME: Handle atomic/volatile loads.
Deps[Inst].insert(std::make_pair(getInstTypePair(0, Unknown),
static_cast<BasicBlock *>(0)));
continue;
}
AliasAnalysis::Location Loc = AA.getLocation(LI);
MDA.getNonLocalPointerDependency(Loc, true, LI->getParent(), NLDI);
} else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
if (!SI->isUnordered()) {
// FIXME: Handle atomic/volatile stores.
Deps[Inst].insert(std::make_pair(getInstTypePair(0, Unknown),
static_cast<BasicBlock *>(0)));
continue;
}
AliasAnalysis::Location Loc = AA.getLocation(SI);
MDA.getNonLocalPointerDependency(Loc, false, SI->getParent(), NLDI);
} else if (VAArgInst *VI = dyn_cast<VAArgInst>(Inst)) {
AliasAnalysis::Location Loc = AA.getLocation(VI);
MDA.getNonLocalPointerDependency(Loc, false, VI->getParent(), NLDI);
} else {
llvm_unreachable("Unknown memory instruction!");
}
DepSet &InstDeps = Deps[Inst];
for (SmallVectorImpl<NonLocalDepResult>::const_iterator
I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
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_inst_iterator I = inst_begin(*F), E = inst_end(*F); I != E; ++I) {
const Instruction *Inst = &*I;
DepSetMap::const_iterator DI = Deps.find(Inst);
if (DI == Deps.end())
continue;
const DepSet &InstDeps = DI->second;
for (DepSet::const_iterator I = InstDeps.begin(), E = InstDeps.end();
I != E; ++I) {
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 ";
WriteAsOperand(OS, DepBB, /*PrintType=*/false, M);
}
if (DepInst) {
OS << " from: ";
DepInst->print(OS);
}
OS << "\n";
}
Inst->print(OS);
OS << "\n\n";
}
}
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