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cppcheck/cli/threadexecutor.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 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>
#include <algorithm>
#ifdef THREADING_MODEL_FORK
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <errno.h>
#include <time.h>
#endif
ThreadExecutor::ThreadExecutor(const std::vector<std::string> &filenames, const std::map<std::string, long> &filesizes, Settings &settings, ErrorLogger &errorLogger)
: _filenames(filenames), _filesizes(filesizes), _settings(settings), _errorLogger(errorLogger), _fileCount(0)
{
#ifdef THREADING_MODEL_FORK
_wpipe = 0;
#endif
}
ThreadExecutor::~ThreadExecutor()
{
//dtor
}
void ThreadExecutor::addFileContent(const std::string &path, const std::string &content)
{
_fileContents[ path ] = content;
}
///////////////////////////////////////////////////////////////////////////////
////// This code is for platforms that support fork() only ////////////////////
///////////////////////////////////////////////////////////////////////////////
#ifdef THREADING_MODEL_FORK
int ThreadExecutor::handleRead(int rpipe, unsigned int &result)
{
char type = 0;
if (read(rpipe, &type, 1) <= 0)
{
if (errno == EAGAIN)
return 0;
return -1;
}
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(rpipe, &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(rpipe, 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);
std::string file;
unsigned int line(0);
if (!msg._callStack.empty())
{
file = msg._callStack.back().getfile(false);
line = msg._callStack.back().line;
}
if (!_settings.nomsg.isSuppressed(msg._id, file, line))
{
// Alert only about unique errors
std::string errmsg = msg.toString(_settings._verbose);
if (std::find(_errorList.begin(), _errorList.end(), errmsg) == _errorList.end())
{
_errorList.push_back(errmsg);
_errorLogger.reportErr(msg);
}
}
}
else if (type == '3')
{
std::istringstream iss(buf);
unsigned int fileResult = 0;
iss >> fileResult;
result += fileResult;
delete [] buf;
return -1;
}
delete [] buf;
return 1;
}
unsigned int ThreadExecutor::check()
{
_fileCount = 0;
unsigned int result = 0;
long totalfilesize = 0;
for (std::map<std::string, long>::const_iterator i = _filesizes.begin(); i != _filesizes.end(); ++i)
{
totalfilesize += i->second;
}
std::list<int> rpipes;
std::map<pid_t, std::string> childFile;
std::map<int, std::string> pipeFile;
long processedsize = 0;
unsigned int i = 0;
while (true)
{
// Start a new child
if (i < _filenames.size() && rpipes.size() < _settings._jobs)
{
int pipes[2];
if (pipe(pipes) == -1)
{
perror("pipe");
exit(1);
}
int flags = 0;
if ((flags = fcntl(pipes[0], F_GETFL, 0)) < 0)
{
perror("fcntl");
exit(1);
}
if (fcntl(pipes[0], F_SETFL, flags | O_NONBLOCK) < 0)
{
perror("fcntl");
exit(1);
}
pid_t pid = fork();
if (pid < 0)
{
// Error
std::cerr << "Failed to create child process" << std::endl;
exit(EXIT_FAILURE);
}
else if (pid == 0)
{
close(pipes[0]);
_wpipe = pipes[1];
CppCheck fileChecker(*this, false);
fileChecker.settings(_settings);
unsigned int resultOfCheck = 0;
if (_fileContents.size() > 0 && _fileContents.find(_filenames[i]) != _fileContents.end())
{
// File content was given as a string
resultOfCheck = fileChecker.check(_filenames[i], _fileContents[ _filenames[i] ]);
}
else
{
// Read file from a file
resultOfCheck = fileChecker.check(_filenames[i]);
}
std::ostringstream oss;
oss << resultOfCheck;
writeToPipe('3', oss.str());
exit(0);
}
close(pipes[1]);
rpipes.push_back(pipes[0]);
childFile[pid] = _filenames[i];
pipeFile[pipes[0]] = _filenames[i];
++i;
}
else if (!rpipes.empty())
{
fd_set rfds;
FD_ZERO(&rfds);
for (std::list<int>::const_iterator rp = rpipes.begin(); rp != rpipes.end(); ++rp)
FD_SET(*rp, &rfds);
int r = select(*std::max_element(rpipes.begin(), rpipes.end()) + 1, &rfds, NULL, NULL, NULL);
if (r > 0)
{
std::list<int>::iterator rp = rpipes.begin();
while (rp != rpipes.end())
{
if (FD_ISSET(*rp, &rfds))
{
int readRes = handleRead(*rp, result);
if (readRes == -1)
{
long size = 0;
std::map<int, std::string>::iterator p = pipeFile.find(*rp);
if (p != pipeFile.end())
{
std::string name = p->second;
pipeFile.erase(p);
std::map<std::string, long>::const_iterator fs = _filesizes.find(name);
if (fs != _filesizes.end())
{
size = fs->second;
}
}
_fileCount++;
processedsize += size;
_errorLogger.reportStatus(_fileCount, _filenames.size(), processedsize, totalfilesize);
close(*rp);
rp = rpipes.erase(rp);
}
else
++rp;
}
else
++rp;
}
}
int stat = 0;
pid_t child = waitpid(0, &stat, WNOHANG);
if (child > 0)
{
std::string childname;
std::map<pid_t, std::string>::iterator c = childFile.find(child);
if (c != childFile.end())
{
childname = c->second;
childFile.erase(c);
}
if (WIFSIGNALED(stat))
{
std::ostringstream oss;
oss << "Internal error: Child process crashed with signal " << WTERMSIG(stat);
std::list<ErrorLogger::ErrorMessage::FileLocation> locations;
locations.push_back(ErrorLogger::ErrorMessage::FileLocation(childname, 0));
const ErrorLogger::ErrorMessage errmsg(locations,
Severity::error,
oss.str(),
"cppcheckError",
false);
_errorLogger.reportErr(errmsg);
}
}
}
else
{
// All done
break;
}
}
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;
std::memcpy(&(out[1]), &len, sizeof(len));
std::memcpy(&(out[1+sizeof(len)]), data.c_str(), len);
if (write(_wpipe, 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 /*fileindex*/, unsigned int /*filecount*/, long /*sizedone*/, long /*sizetotal*/)
{
// 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 /*fileindex*/, unsigned int /*filecount*/, long /*sizedone*/, long /*sizetotal*/)
{
}
#endif
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