forked from OSchip/llvm-project
193 lines
6.3 KiB
C++
193 lines
6.3 KiB
C++
//===- MemDepPrinter.cpp - Printer for MemoryDependenceAnalysis -----------===//
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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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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Analysis/MemoryDependenceAnalysis.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Assembly/Writer.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SetVector.h"
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using namespace llvm;
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namespace {
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struct MemDepPrinter : public FunctionPass {
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const Function *F;
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enum DepType {
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Clobber = 0,
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Def,
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NonFuncLocal,
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Unknown
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};
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static const char* DepTypeStr[];
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typedef PointerIntPair<const Instruction *, 2, DepType> InstTypePair;
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typedef std::pair<InstTypePair, const BasicBlock *> Dep;
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typedef SmallSetVector<Dep, 4> DepSet;
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typedef DenseMap<const Instruction *, DepSet> DepSetMap;
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DepSetMap Deps;
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static char ID; // Pass identifcation, replacement for typeid
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MemDepPrinter() : FunctionPass(ID) {
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initializeMemDepPrinterPass(*PassRegistry::getPassRegistry());
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}
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virtual bool runOnFunction(Function &F);
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void print(raw_ostream &OS, const Module * = 0) const;
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequiredTransitive<AliasAnalysis>();
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AU.addRequiredTransitive<MemoryDependenceAnalysis>();
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AU.setPreservesAll();
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}
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virtual void releaseMemory() {
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Deps.clear();
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F = 0;
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}
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private:
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static InstTypePair getInstTypePair(MemDepResult dep) {
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if (dep.isClobber())
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return InstTypePair(dep.getInst(), Clobber);
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if (dep.isDef())
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return InstTypePair(dep.getInst(), Def);
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if (dep.isNonFuncLocal())
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return InstTypePair(dep.getInst(), NonFuncLocal);
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assert(dep.isUnknown() && "unexptected dependence type");
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return InstTypePair(dep.getInst(), Unknown);
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}
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static InstTypePair getInstTypePair(const Instruction* inst, DepType type) {
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return InstTypePair(inst, type);
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}
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};
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}
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char MemDepPrinter::ID = 0;
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INITIALIZE_PASS_BEGIN(MemDepPrinter, "print-memdeps",
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"Print MemDeps of function", false, true)
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INITIALIZE_PASS_DEPENDENCY(MemoryDependenceAnalysis)
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INITIALIZE_PASS_END(MemDepPrinter, "print-memdeps",
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"Print MemDeps of function", false, true)
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FunctionPass *llvm::createMemDepPrinter() {
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return new MemDepPrinter();
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}
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const char* MemDepPrinter::DepTypeStr[]
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= {"Clobber", "Def", "NonFuncLocal", "Unknown"};
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bool MemDepPrinter::runOnFunction(Function &F) {
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this->F = &F;
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AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
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MemoryDependenceAnalysis &MDA = getAnalysis<MemoryDependenceAnalysis>();
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// All this code uses non-const interfaces because MemDep is not
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// const-friendly, though nothing is actually modified.
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for (inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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Instruction *Inst = &*I;
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if (!Inst->mayReadFromMemory() && !Inst->mayWriteToMemory())
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continue;
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MemDepResult Res = MDA.getDependency(Inst);
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if (!Res.isNonLocal()) {
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Deps[Inst].insert(std::make_pair(getInstTypePair(Res),
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static_cast<BasicBlock *>(0)));
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} else if (CallSite CS = cast<Value>(Inst)) {
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const MemoryDependenceAnalysis::NonLocalDepInfo &NLDI =
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MDA.getNonLocalCallDependency(CS);
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DepSet &InstDeps = Deps[Inst];
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for (MemoryDependenceAnalysis::NonLocalDepInfo::const_iterator
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I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
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const MemDepResult &Res = I->getResult();
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InstDeps.insert(std::make_pair(getInstTypePair(Res), I->getBB()));
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}
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} else {
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SmallVector<NonLocalDepResult, 4> NLDI;
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if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
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if (!LI->isUnordered()) {
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// FIXME: Handle atomic/volatile loads.
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Deps[Inst].insert(std::make_pair(getInstTypePair(0, Unknown),
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static_cast<BasicBlock *>(0)));
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continue;
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}
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AliasAnalysis::Location Loc = AA.getLocation(LI);
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MDA.getNonLocalPointerDependency(Loc, true, LI->getParent(), NLDI);
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} else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
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if (!LI->isUnordered()) {
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// FIXME: Handle atomic/volatile stores.
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Deps[Inst].insert(std::make_pair(getInstTypePair(0, Unknown),
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static_cast<BasicBlock *>(0)));
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continue;
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}
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AliasAnalysis::Location Loc = AA.getLocation(SI);
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MDA.getNonLocalPointerDependency(Loc, false, SI->getParent(), NLDI);
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} else if (VAArgInst *VI = dyn_cast<VAArgInst>(Inst)) {
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AliasAnalysis::Location Loc = AA.getLocation(VI);
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MDA.getNonLocalPointerDependency(Loc, false, VI->getParent(), NLDI);
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} else {
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llvm_unreachable("Unknown memory instruction!");
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}
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DepSet &InstDeps = Deps[Inst];
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for (SmallVectorImpl<NonLocalDepResult>::const_iterator
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I = NLDI.begin(), E = NLDI.end(); I != E; ++I) {
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const MemDepResult &Res = I->getResult();
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InstDeps.insert(std::make_pair(getInstTypePair(Res), I->getBB()));
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}
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}
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}
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return false;
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}
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void MemDepPrinter::print(raw_ostream &OS, const Module *M) const {
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for (const_inst_iterator I = inst_begin(*F), E = inst_end(*F); I != E; ++I) {
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const Instruction *Inst = &*I;
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DepSetMap::const_iterator DI = Deps.find(Inst);
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if (DI == Deps.end())
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continue;
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const DepSet &InstDeps = DI->second;
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for (DepSet::const_iterator I = InstDeps.begin(), E = InstDeps.end();
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I != E; ++I) {
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const Instruction *DepInst = I->first.getPointer();
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DepType type = I->first.getInt();
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const BasicBlock *DepBB = I->second;
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OS << " ";
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OS << DepTypeStr[type];
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if (DepBB) {
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OS << " in block ";
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WriteAsOperand(OS, DepBB, /*PrintType=*/false, M);
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}
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if (DepInst) {
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OS << " from: ";
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DepInst->print(OS);
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}
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OS << "\n";
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}
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Inst->print(OS);
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OS << "\n\n";
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}
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}
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