cppcheck/src/threadexecutor.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2009 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/
*/
#include "threadexecutor.h"
#include "cppcheck.h"
#include <iostream>
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#include <algorithm>
#if defined(__GNUC__) && !defined(__MINGW32__)
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
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#include <cstdlib>
#include <cstring>
#include <cstdio>
#endif
ThreadExecutor::ThreadExecutor(const std::vector<std::string> &filenames, const Settings &settings, ErrorLogger &errorLogger)
: _filenames(filenames), _settings(settings), _errorLogger(errorLogger), _fileCount(0)
{
}
ThreadExecutor::~ThreadExecutor()
{
//dtor
}
///////////////////////////////////////////////////////////////////////////////
////// This code is for __GNUC__ only /////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
#if defined(__GNUC__) && !defined(__MINGW32__)
bool ThreadExecutor::handleRead(unsigned int &result)
{
char type = 0;
if (read(_pipe[0], &type, 1) <= 0)
{
return false;
}
if (type != '1' && type != '2' && type != '3')
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
unsigned int len = 0;
if (read(_pipe[0], &len, sizeof(len)) <= 0)
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
char *buf = new char[len];
if (read(_pipe[0], buf, len) <= 0)
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
if (type == '1')
{
_errorLogger.reportOut(buf);
}
else if (type == '2')
{
ErrorLogger::ErrorMessage msg;
msg.deserialize(buf);
// Alert only about unique errors
std::string errmsg = msg.toText();
if (std::find(_errorList.begin(), _errorList.end(), errmsg) == _errorList.end())
{
_errorList.push_back(errmsg);
_errorLogger.reportErr(msg);
}
}
else if (type == '3')
{
_fileCount++;
std::istringstream iss(buf);
unsigned int fileResult = 0;
iss >> fileResult;
result += fileResult;
_errorLogger.reportStatus(_fileCount, _filenames.size());
}
delete [] buf;
return true;
}
unsigned int ThreadExecutor::check()
{
_fileCount = 0;
unsigned int result = 0;
if (pipe(_pipe) == -1)
{
perror("pipe");
exit(1);
}
int flags = 0;
if ((flags = fcntl(_pipe[0], F_GETFL, 0)) < 0)
{
perror("fcntl");
exit(1);
}
if (fcntl(_pipe[0], F_SETFL, flags | O_NONBLOCK) < 0)
{
perror("fcntl");
exit(1);
}
unsigned int childCount = 0;
for (unsigned int i = 0; i < _filenames.size(); i++)
{
// Keep only wanted amount of child processes running at a time.
if (childCount >= _settings._jobs)
{
while (handleRead(result))
{
}
int stat = 0;
waitpid(0, &stat, 0);
--childCount;
}
pid_t pid = fork();
if (pid < 0)
{
// Error
std::cerr << "Failed to create child process" << std::endl;
exit(EXIT_FAILURE);
}
else if (pid == 0)
{
CppCheck fileChecker(*this);
fileChecker.settings(_settings);
fileChecker.addFile(_filenames[i]);
unsigned int result = fileChecker.check();
std::ostringstream oss;
oss << result;
writeToPipe('3', oss.str());
exit(0);
}
++childCount;
}
while (childCount > 0)
{
int stat = 0;
waitpid(0, &stat, 0);
--childCount;
}
while (handleRead(result))
{
}
return result;
}
void ThreadExecutor::writeToPipe(char type, const std::string &data)
{
unsigned int len = data.length() + 1;
char *out = new char[ len + 1 + sizeof(len)];
out[0] = type;
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std::memcpy(&(out[1]), &len, sizeof(len));
std::memcpy(&(out[1+sizeof(len)]), data.c_str(), len);
if (write(_pipe[1], out, len + 1 + sizeof(len)) <= 0)
{
delete [] out;
out = 0;
std::cerr << "#### ThreadExecutor::writeToPipe, Failed to write to pipe" << std::endl;
exit(0);
}
delete [] out;
}
void ThreadExecutor::reportOut(const std::string &outmsg)
{
writeToPipe('1', outmsg);
}
void ThreadExecutor::reportErr(const ErrorLogger::ErrorMessage &msg)
{
writeToPipe('2', msg.serialize());
}
void ThreadExecutor::reportStatus(unsigned int /*index*/, unsigned int /*max*/)
{
// Not used
}
#else
unsigned int ThreadExecutor::check()
{
return 0;
}
void ThreadExecutor::reportOut(const std::string &/*outmsg*/)
{
}
void ThreadExecutor::reportErr(const ErrorLogger::ErrorMessage &/*msg*/)
{
}
void ThreadExecutor::reportStatus(unsigned int /*index*/, unsigned int /*max*/)
{
}
#endif