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//===- llvm-prof.cpp - Read in and process llvmprof.out data files --------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tools is meant for use with the various LLVM profiling instrumentation
// passes. It reads in the data file produced by executing an instrumented
// program, and outputs a nice report.
//
//===----------------------------------------------------------------------===//
#include "ProfileInfo.h"
#include "llvm/Function.h"
#include "llvm/Bytecode/Reader.h"
#include "Support/CommandLine.h"
#include <iostream>
#include <cstdio>
#include <map>
namespace {
cl::opt<std::string>
BytecodeFile(cl::Positional, cl::desc("<program bytecode file>"),
cl::Required);
cl::opt<std::string>
ProfileDataFile(cl::Positional, cl::desc("<llvmprof.out file>"),
cl::Optional, cl::init("llvmprof.out"));
}
// PairSecondSort - A sorting predicate to sort by the second element of a pair.
template<class T>
struct PairSecondSortReverse
: public std::binary_function<std::pair<T, unsigned>,
std::pair<T, unsigned>, bool> {
bool operator()(const std::pair<T, unsigned> &LHS,
const std::pair<T, unsigned> &RHS) const {
return LHS.second > RHS.second;
}
};
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm profile dump decoder\n");
// Read in the bytecode file...
std::string ErrorMessage;
Module *M = ParseBytecodeFile(BytecodeFile, &ErrorMessage);
if (M == 0) {
std::cerr << argv[0] << ": " << BytecodeFile << ": " << ErrorMessage
<< "\n";
return 1;
}
// Read the profiling information
ProfileInfo PI(argv[0], ProfileDataFile, *M);
// Output a report. Eventually, there will be multiple reports selectable on
// the command line, for now, just keep things simple.
// Emit the most frequent function table...
std::vector<std::pair<Function*, unsigned> > FunctionCounts;
PI.getFunctionCounts(FunctionCounts);
// Sort by the frequency, backwards.
std::sort(FunctionCounts.begin(), FunctionCounts.end(),
PairSecondSortReverse<Function*>());
unsigned TotalExecutions = 0;
for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i)
TotalExecutions += FunctionCounts[i].second;
std::cout << "===" << std::string(73, '-') << "===\n"
<< "LLVM profiling output for execution";
if (PI.getNumExecutions() != 1) std::cout << "s";
std::cout << ":\n";
for (unsigned i = 0, e = PI.getNumExecutions(); i != e; ++i) {
std::cout << " ";
if (e != 1) std::cout << i+1 << ". ";
std::cout << PI.getExecution(i) << "\n";
}
std::cout << "\n===" << std::string(73, '-') << "===\n";
std::cout << "Function execution frequencies:\n\n";
// Print out the function frequencies...
printf(" ## Frequency\n");
for (unsigned i = 0, e = FunctionCounts.size(); i != e; ++i) {
if (FunctionCounts[i].second == 0) {
printf("\n NOTE: %d function%s never executed!\n",
e-i, e-i-1 ? "s were" : " was");
break;
}
printf("%3d. %5d/%d %s\n", i+1, FunctionCounts[i].second, TotalExecutions,
FunctionCounts[i].first->getName().c_str());
}
// If we have block count information, print out the LLVM module with
// frequency annotations.
if (PI.hasAccurateBlockCounts()) {
std::vector<std::pair<BasicBlock*, unsigned> > Counts;
PI.getBlockCounts(Counts);
TotalExecutions = 0;
for (unsigned i = 0, e = Counts.size(); i != e; ++i)
TotalExecutions += Counts[i].second;
// Sort by the frequency, backwards.
std::sort(Counts.begin(), Counts.end(),
PairSecondSortReverse<BasicBlock*>());
std::cout << "\n===" << std::string(73, '-') << "===\n";
std::cout << "Top 20 most frequently executed basic blocks:\n\n";
// Print out the function frequencies...
printf(" ## Frequency\n");
unsigned BlocksToPrint = Counts.size();
if (BlocksToPrint > 20) BlocksToPrint = 20;
for (unsigned i = 0; i != BlocksToPrint; ++i)
printf("%3d. %5d/%d %s - %s\n", i+1, Counts[i].second, TotalExecutions,
Counts[i].first->getParent()->getName().c_str(),
Counts[i].first->getName().c_str());
std::map<BasicBlock*, unsigned> BlockFreqs(Counts.begin(), Counts.end());
}
return 0;
}
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