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79331b2fcd
(See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090824/085620.html) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80349 91177308-0d34-0410-b5e6-96231b3b80d8
296 lines
9.9 KiB
C++
296 lines
9.9 KiB
C++
//===- llvm-prof.cpp - Read in and process llvmprof.out data files --------===//
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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 tools is meant for use with the various LLVM profiling instrumentation
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// passes. It reads in the data file produced by executing an instrumented
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// program, and outputs a nice report.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/InstrTypes.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Assembly/AsmAnnotationWriter.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/Analysis/Passes.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.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/System/Signals.h"
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#include <algorithm>
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#include <iomanip>
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#include <map>
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#include <set>
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using namespace llvm;
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namespace {
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cl::opt<std::string>
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BitcodeFile(cl::Positional, cl::desc("<program bitcode file>"),
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cl::Required);
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cl::opt<std::string>
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ProfileDataFile(cl::Positional, cl::desc("<llvmprof.out file>"),
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cl::Optional, cl::init("llvmprof.out"));
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cl::opt<bool>
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PrintAnnotatedLLVM("annotated-llvm",
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cl::desc("Print LLVM code with frequency annotations"));
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cl::alias PrintAnnotated2("A", cl::desc("Alias for --annotated-llvm"),
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cl::aliasopt(PrintAnnotatedLLVM));
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cl::opt<bool>
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PrintAllCode("print-all-code",
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cl::desc("Print annotated code for the entire program"));
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}
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// PairSecondSort - A sorting predicate to sort by the second element of a pair.
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template<class T>
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struct PairSecondSortReverse
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: public std::binary_function<std::pair<T, double>,
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std::pair<T, double>, bool> {
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bool operator()(const std::pair<T, double> &LHS,
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const std::pair<T, double> &RHS) const {
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return LHS.second > RHS.second;
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}
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};
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static double ignoreMissing(double w) {
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if (w == ProfileInfo::MissingValue) return 0;
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return w;
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}
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namespace {
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class ProfileAnnotator : public AssemblyAnnotationWriter {
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ProfileInfo &PI;
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public:
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ProfileAnnotator(ProfileInfo& pi) : PI(pi) {}
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virtual void emitFunctionAnnot(const Function *F, raw_ostream &OS) {
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double w = PI.getExecutionCount(F);
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if (w != ProfileInfo::MissingValue) {
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OS << ";;; %" << F->getName() << " called "<<(unsigned)w
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<<" times.\n;;;\n";
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}
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}
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virtual void emitBasicBlockStartAnnot(const BasicBlock *BB,
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raw_ostream &OS) {
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double w = PI.getExecutionCount(BB);
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if (w != ProfileInfo::MissingValue) {
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if (w != 0) {
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OS << "\t;;; Basic block executed " << (unsigned)w << " times.\n";
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} else {
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OS << "\t;;; Never executed!\n";
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}
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}
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}
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virtual void emitBasicBlockEndAnnot(const BasicBlock *BB, raw_ostream &OS) {
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// Figure out how many times each successor executed.
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std::vector<std::pair<ProfileInfo::Edge, double> > SuccCounts;
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const TerminatorInst *TI = BB->getTerminator();
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for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
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BasicBlock* Succ = TI->getSuccessor(s);
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double w = ignoreMissing(PI.getEdgeWeight(std::make_pair(BB, Succ)));
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if (w != 0)
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SuccCounts.push_back(std::make_pair(std::make_pair(BB, Succ), w));
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}
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if (!SuccCounts.empty()) {
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OS << "\t;;; Out-edge counts:";
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for (unsigned i = 0, e = SuccCounts.size(); i != e; ++i)
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OS << " [" << (SuccCounts[i]).second << " -> "
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<< (SuccCounts[i]).first.second->getName() << "]";
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OS << "\n";
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}
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}
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};
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}
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namespace {
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/// ProfileInfoPrinterPass - Helper pass to dump the profile information for
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/// a module.
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//
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// FIXME: This should move elsewhere.
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class ProfileInfoPrinterPass : public ModulePass {
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ProfileInfoLoader &PIL;
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public:
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static char ID; // Class identification, replacement for typeinfo.
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explicit ProfileInfoPrinterPass(ProfileInfoLoader &_PIL)
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: ModulePass(&ID), PIL(_PIL) {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<ProfileInfo>();
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}
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bool runOnModule(Module &M);
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};
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}
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char ProfileInfoPrinterPass::ID = 0;
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bool ProfileInfoPrinterPass::runOnModule(Module &M) {
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ProfileInfo &PI = getAnalysis<ProfileInfo>();
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std::map<const Function *, unsigned> FuncFreqs;
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std::map<const BasicBlock*, unsigned> BlockFreqs;
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std::map<ProfileInfo::Edge, unsigned> EdgeFreqs;
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// Output a report. Eventually, there will be multiple reports selectable on
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// the command line, for now, just keep things simple.
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// Emit the most frequent function table...
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std::vector<std::pair<Function*, double> > FunctionCounts;
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std::vector<std::pair<BasicBlock*, double> > Counts;
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for (Module::iterator FI = M.begin(), FE = M.end(); FI != FE; ++FI) {
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if (FI->isDeclaration()) continue;
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double w = ignoreMissing(PI.getExecutionCount(FI));
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FunctionCounts.push_back(std::make_pair(FI, w));
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for (Function::iterator BB = FI->begin(), BBE = FI->end();
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BB != BBE; ++BB) {
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double w = ignoreMissing(PI.getExecutionCount(BB));
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Counts.push_back(std::make_pair(BB, w));
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}
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}
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// Sort by the frequency, backwards.
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sort(FunctionCounts.begin(), FunctionCounts.end(),
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PairSecondSortReverse<Function*>());
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double TotalExecutions = 0;
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for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i)
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TotalExecutions += FunctionCounts[i].second;
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outs() << "===" << std::string(73, '-') << "===\n"
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<< "LLVM profiling output for execution";
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if (PIL.getNumExecutions() != 1) outs() << "s";
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outs() << ":\n";
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for (unsigned i = 0, e = PIL.getNumExecutions(); i != e; ++i) {
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outs() << " ";
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if (e != 1) outs() << i+1 << ". ";
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outs() << PIL.getExecution(i) << "\n";
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}
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outs() << "\n===" << std::string(73, '-') << "===\n";
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outs() << "Function execution frequencies:\n\n";
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// Print out the function frequencies...
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outs() << " ## Frequency\n";
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for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i) {
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if (FunctionCounts[i].second == 0) {
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outs() << "\n NOTE: " << e-i << " function"
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<< (e-i-1 ? "s were" : " was") << " never executed!\n";
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break;
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}
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outs() << format("%3d", i+1) << ". "
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<< format("%5.2g", FunctionCounts[i].second) << "/"
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<< format("%g", TotalExecutions) << " "
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<< FunctionCounts[i].first->getNameStr() << "\n";
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}
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std::set<Function*> FunctionsToPrint;
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TotalExecutions = 0;
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for (unsigned i = 0, e = Counts.size(); i != e; ++i)
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TotalExecutions += Counts[i].second;
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// Sort by the frequency, backwards.
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sort(Counts.begin(), Counts.end(),
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PairSecondSortReverse<BasicBlock*>());
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outs() << "\n===" << std::string(73, '-') << "===\n";
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outs() << "Top 20 most frequently executed basic blocks:\n\n";
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// Print out the function frequencies...
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outs() <<" ## %% \tFrequency\n";
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unsigned BlocksToPrint = Counts.size();
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if (BlocksToPrint > 20) BlocksToPrint = 20;
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for (unsigned i = 0; i != BlocksToPrint; ++i) {
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if (Counts[i].second == 0) break;
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Function *F = Counts[i].first->getParent();
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outs() << format("%3d", i+1) << ". "
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<< format("%5g", Counts[i].second/(double)TotalExecutions*100) << "% "
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<< format("%5.0f", Counts[i].second) << "/"
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<< format("%g", TotalExecutions) << "\t"
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<< F->getNameStr() << "() - "
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<< Counts[i].first->getNameStr() << "\n";
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FunctionsToPrint.insert(F);
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}
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if (PrintAnnotatedLLVM || PrintAllCode) {
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outs() << "\n===" << std::string(73, '-') << "===\n";
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outs() << "Annotated LLVM code for the module:\n\n";
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ProfileAnnotator PA(PI);
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if (FunctionsToPrint.empty() || PrintAllCode)
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M.print(outs(), &PA);
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else
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// Print just a subset of the functions.
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for (std::set<Function*>::iterator I = FunctionsToPrint.begin(),
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E = FunctionsToPrint.end(); I != E; ++I)
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(*I)->print(outs(), &PA);
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}
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return false;
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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LLVMContext &Context = getGlobalContext();
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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try {
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cl::ParseCommandLineOptions(argc, argv, "llvm profile dump decoder\n");
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// Read in the bitcode file...
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std::string ErrorMessage;
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Module *M = 0;
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if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(BitcodeFile,
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&ErrorMessage)) {
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M = ParseBitcodeFile(Buffer, Context, &ErrorMessage);
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delete Buffer;
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}
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if (M == 0) {
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errs() << argv[0] << ": " << BitcodeFile << ": "
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<< ErrorMessage << "\n";
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return 1;
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}
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// Read the profiling information. This is redundant since we load it again
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// using the standard profile info provider pass, but for now this gives us
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// access to additional information not exposed via the ProfileInfo
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// interface.
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ProfileInfoLoader PIL(argv[0], ProfileDataFile, *M);
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// Run the printer pass.
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PassManager PassMgr;
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PassMgr.add(createProfileLoaderPass(ProfileDataFile));
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PassMgr.add(new ProfileInfoPrinterPass(PIL));
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PassMgr.run(*M);
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return 0;
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} catch (const std::string& msg) {
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errs() << argv[0] << ": " << msg << "\n";
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} catch (...) {
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errs() << argv[0] << ": Unexpected unknown exception occurred.\n";
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}
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return 1;
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}
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