296 lines
10 KiB
C++
296 lines
10 KiB
C++
//===- ProfileInfoLoaderPass.cpp - LLVM Pass to load profile info ---------===//
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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 concrete implementation of profiling information that
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// loads the information from a profile dump file.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "profile-loader"
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#include "llvm/BasicBlock.h"
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#include "llvm/InstrTypes.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/ProfileInfo.h"
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#include "llvm/Analysis/ProfileInfoLoader.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Format.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/ADT/SmallSet.h"
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#include <set>
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using namespace llvm;
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STATISTIC(NumEdgesRead, "The # of edges read.");
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static cl::opt<std::string>
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ProfileInfoFilename("profile-info-file", cl::init("llvmprof.out"),
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cl::value_desc("filename"),
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cl::desc("Profile file loaded by -profile-loader"));
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namespace {
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class VISIBILITY_HIDDEN LoaderPass : public ModulePass, public ProfileInfo {
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std::string Filename;
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std::set<Edge> SpanningTree;
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std::set<const BasicBlock*> BBisUnvisited;
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unsigned ReadCount;
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public:
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static char ID; // Class identification, replacement for typeinfo
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explicit LoaderPass(const std::string &filename = "")
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: ModulePass(&ID), Filename(filename) {
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if (filename.empty()) Filename = ProfileInfoFilename;
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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virtual const char *getPassName() const {
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return "Profiling information loader";
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}
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// recurseBasicBlock() - Calculates the edge weights for as much basic
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// blocks as possbile.
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virtual void recurseBasicBlock(const BasicBlock *BB);
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virtual void readEdgeOrRemember(Edge, Edge&, unsigned &, unsigned &);
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virtual void readEdge(ProfileInfo::Edge, std::vector<unsigned>&);
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/// run - Load the profile information from the specified file.
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virtual bool runOnModule(Module &M);
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};
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} // End of anonymous namespace
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char LoaderPass::ID = 0;
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static RegisterPass<LoaderPass>
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X("profile-loader", "Load profile information from llvmprof.out", false, true);
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static RegisterAnalysisGroup<ProfileInfo> Y(X);
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ModulePass *llvm::createProfileLoaderPass() { return new LoaderPass(); }
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/// createProfileLoaderPass - This function returns a Pass that loads the
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/// profiling information for the module from the specified filename, making it
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/// available to the optimizers.
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Pass *llvm::createProfileLoaderPass(const std::string &Filename) {
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return new LoaderPass(Filename);
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}
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void LoaderPass::readEdgeOrRemember(Edge edge, Edge &tocalc,
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unsigned &uncalc, unsigned &count) {
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double w;
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if ((w = getEdgeWeight(edge)) == MissingValue) {
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tocalc = edge;
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uncalc++;
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} else {
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count+=w;
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}
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}
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// recurseBasicBlock - Visits all neighbours of a block and then tries to
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// calculate the missing edge values.
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void LoaderPass::recurseBasicBlock(const BasicBlock *BB) {
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// break recursion if already visited
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if (BBisUnvisited.find(BB) == BBisUnvisited.end()) return;
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BBisUnvisited.erase(BB);
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if (!BB) return;
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for (succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
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bbi != bbe; ++bbi) {
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recurseBasicBlock(*bbi);
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}
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for (pred_const_iterator bbi = pred_begin(BB), bbe = pred_end(BB);
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bbi != bbe; ++bbi) {
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recurseBasicBlock(*bbi);
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}
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Edge edgetocalc;
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unsigned uncalculated = 0;
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// collect weights of all incoming and outgoing edges, rememer edges that
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// have no value
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unsigned incount = 0;
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SmallSet<const BasicBlock*,8> pred_visited;
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pred_const_iterator bbi = pred_begin(BB), bbe = pred_end(BB);
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if (bbi==bbe) {
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readEdgeOrRemember(getEdge(0, BB),edgetocalc,uncalculated,incount);
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}
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for (;bbi != bbe; ++bbi) {
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if (pred_visited.insert(*bbi)) {
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readEdgeOrRemember(getEdge(*bbi, BB),edgetocalc,uncalculated,incount);
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}
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}
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unsigned outcount = 0;
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SmallSet<const BasicBlock*,8> succ_visited;
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succ_const_iterator sbbi = succ_begin(BB), sbbe = succ_end(BB);
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if (sbbi==sbbe) {
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readEdgeOrRemember(getEdge(BB, 0),edgetocalc,uncalculated,outcount);
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}
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for (;sbbi != sbbe; ++sbbi) {
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if (succ_visited.insert(*sbbi)) {
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readEdgeOrRemember(getEdge(BB, *sbbi),edgetocalc,uncalculated,outcount);
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}
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}
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// if exactly one edge weight was missing, calculate it and remove it from
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// spanning tree
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if (uncalculated == 1) {
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if (incount < outcount) {
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EdgeInformation[BB->getParent()][edgetocalc] = outcount-incount;
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} else {
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EdgeInformation[BB->getParent()][edgetocalc] = incount-outcount;
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}
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DEBUG(errs() << "--Calc Edge Counter for " << edgetocalc << ": "
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<< format("%g", getEdgeWeight(edgetocalc)) << "\n");
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SpanningTree.erase(edgetocalc);
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}
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}
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void LoaderPass::readEdge(ProfileInfo::Edge e,
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std::vector<unsigned> &ECs) {
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if (ReadCount < ECs.size()) {
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double weight = ECs[ReadCount++];
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if (weight != ProfileInfoLoader::Uncounted) {
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// Here the data realm changes from the unsigned of the file to the
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// double of the ProfileInfo. This conversion is save because we know
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// that everything thats representable in unsinged is also representable
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// in double.
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EdgeInformation[getFunction(e)][e] += (double)weight;
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DEBUG(errs() << "--Read Edge Counter for " << e
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<< " (# "<< (ReadCount-1) << "): "
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<< (unsigned)getEdgeWeight(e) << "\n");
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} else {
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// This happens only if reading optimal profiling information, not when
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// reading regular profiling information.
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SpanningTree.insert(e);
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}
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}
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}
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bool LoaderPass::runOnModule(Module &M) {
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ProfileInfoLoader PIL("profile-loader", Filename, M);
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EdgeInformation.clear();
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std::vector<unsigned> Counters = PIL.getRawEdgeCounts();
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if (Counters.size() > 0) {
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ReadCount = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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DEBUG(errs()<<"Working on "<<F->getNameStr()<<"\n");
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readEdge(getEdge(0,&F->getEntryBlock()), Counters);
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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TerminatorInst *TI = BB->getTerminator();
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for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
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readEdge(getEdge(BB,TI->getSuccessor(s)), Counters);
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}
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}
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}
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if (ReadCount != Counters.size()) {
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errs() << "WARNING: profile information is inconsistent with "
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<< "the current program!\n";
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}
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NumEdgesRead = ReadCount;
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}
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Counters = PIL.getRawOptimalEdgeCounts();
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if (Counters.size() > 0) {
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ReadCount = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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DEBUG(errs()<<"Working on "<<F->getNameStr()<<"\n");
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readEdge(getEdge(0,&F->getEntryBlock()), Counters);
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
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TerminatorInst *TI = BB->getTerminator();
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if (TI->getNumSuccessors() == 0) {
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readEdge(getEdge(BB,0), Counters);
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}
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for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
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readEdge(getEdge(BB,TI->getSuccessor(s)), Counters);
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}
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}
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while (SpanningTree.size() > 0) {
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#if 0
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unsigned size = SpanningTree.size();
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#endif
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BBisUnvisited.clear();
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for (std::set<Edge>::iterator ei = SpanningTree.begin(),
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ee = SpanningTree.end(); ei != ee; ++ei) {
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BBisUnvisited.insert(ei->first);
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BBisUnvisited.insert(ei->second);
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}
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while (BBisUnvisited.size() > 0) {
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recurseBasicBlock(*BBisUnvisited.begin());
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}
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#if 0
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if (SpanningTree.size() == size) {
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DEBUG(errs()<<"{");
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for (std::set<Edge>::iterator ei = SpanningTree.begin(),
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ee = SpanningTree.end(); ei != ee; ++ei) {
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DEBUG(errs()<<"("<<(ei->first?ei->first->getName():"0")<<","
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<<(ei->second?ei->second->getName():"0")<<"),");
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}
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assert(0 && "No edge calculated!");
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}
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#endif
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}
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}
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if (ReadCount != Counters.size()) {
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errs() << "WARNING: profile information is inconsistent with "
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<< "the current program!\n";
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}
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NumEdgesRead = ReadCount;
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}
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BlockInformation.clear();
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Counters = PIL.getRawBlockCounts();
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if (Counters.size() > 0) {
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ReadCount = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
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if (ReadCount < Counters.size())
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// Here the data realm changes from the unsigned of the file to the
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// double of the ProfileInfo. This conversion is save because we know
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// that everything thats representable in unsinged is also
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// representable in double.
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BlockInformation[F][BB] = (double)Counters[ReadCount++];
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}
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if (ReadCount != Counters.size()) {
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errs() << "WARNING: profile information is inconsistent with "
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<< "the current program!\n";
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}
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}
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FunctionInformation.clear();
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Counters = PIL.getRawFunctionCounts();
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if (Counters.size() > 0) {
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ReadCount = 0;
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for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
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if (F->isDeclaration()) continue;
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if (ReadCount < Counters.size())
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// Here the data realm changes from the unsigned of the file to the
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// double of the ProfileInfo. This conversion is save because we know
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// that everything thats representable in unsinged is also
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// representable in double.
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FunctionInformation[F] = (double)Counters[ReadCount++];
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}
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if (ReadCount != Counters.size()) {
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errs() << "WARNING: profile information is inconsistent with "
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<< "the current program!\n";
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}
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}
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return false;
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}
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