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cppcheck/lib/cppcheck.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2014 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 "cppcheck.h"
#include "preprocessor.h" // Preprocessor
#include "tokenize.h" // Tokenizer
#include "checkunusedfunctions.h"
#include "check.h"
#include "path.h"
#include <algorithm>
#include <fstream>
#include <sstream>
#include <stdexcept>
#include "timer.h"
#include "version.h"
#ifdef HAVE_RULES
#define PCRE_STATIC
#include <pcre.h>
#endif
static const char Version[] = CPPCHECK_VERSION_STRING;
static const char ExtraVersion[] = "";
static TimerResults S_timerResults;
CppCheck::CppCheck(ErrorLogger &errorLogger, bool useGlobalSuppressions)
: _errorLogger(errorLogger), exitcode(0), _useGlobalSuppressions(useGlobalSuppressions), tooManyConfigs(false), _simplify(true)
{
}
CppCheck::~CppCheck()
{
S_timerResults.ShowResults(_settings._showtime);
}
const char * CppCheck::version()
{
return Version;
}
const char * CppCheck::extraVersion()
{
return ExtraVersion;
}
unsigned int CppCheck::check(const std::string &path)
{
return processFile(path, "");
}
unsigned int CppCheck::check(const std::string &path, const std::string &content)
{
return processFile(path, content);
}
void CppCheck::replaceAll(std::string& code, const std::string &from, const std::string &to)
{
std::size_t pos = 0;
while ((pos = code.find(from, pos)) != std::string::npos) {
code.replace(pos, from.length(), to);
pos += to.length();
}
}
bool CppCheck::findError(std::string code, const char FileName[])
{
std::set<unsigned long long> checksums;
// First make sure that error occurs with the original code
checkFile(code, FileName, checksums);
if (_errorList.empty()) {
// Error does not occur with this code
return false;
}
std::string previousCode = code;
std::string error = _errorList.front();
for (;;) {
// Try to remove included files from the source
std::size_t found = previousCode.rfind("\n#endfile");
if (found == std::string::npos) {
// No modifications can be done to the code
} else {
// Modify code and re-check it to see if error
// is still there.
code = previousCode.substr(found+9);
_errorList.clear();
checksums.clear();
checkFile(code, FileName, checksums);
}
if (_errorList.empty()) {
// Latest code didn't fail anymore. Fall back
// to previous code
code = previousCode;
} else {
error = _errorList.front();
}
// Add '\n' so that "\n#file" on first line would be found
code = "// " + error + "\n" + code;
replaceAll(code, "\n#file", "\n// #file");
replaceAll(code, "\n#endfile", "\n// #endfile");
// We have reduced the code as much as we can. Print out
// the code and quit.
_errorLogger.reportOut(code);
break;
}
return true;
}
unsigned int CppCheck::processFile(const std::string& filename, const std::string& fileContent)
{
exitcode = 0;
// only show debug warnings for accepted C/C++ source files
if (!Path::acceptFile(filename))
_settings.debugwarnings = false;
if (_settings.terminated())
return exitcode;
if (_settings._errorsOnly == false) {
std::string fixedpath = Path::simplifyPath(filename);
fixedpath = Path::toNativeSeparators(fixedpath);
_errorLogger.reportOut(std::string("Checking ") + fixedpath + std::string("..."));
}
try {
Preprocessor preprocessor(&_settings, this);
std::list<std::string> configurations;
std::string filedata = "";
if (!fileContent.empty()) {
// File content was given as a string (democlient)
std::istringstream iss(fileContent);
preprocessor.preprocess(iss, filedata, configurations, filename, _settings._includePaths);
} else {
// Only file name was given, read the content from file
std::ifstream fin(filename.c_str());
Timer t("Preprocessor::preprocess", _settings._showtime, &S_timerResults);
preprocessor.preprocess(fin, filedata, configurations, filename, _settings._includePaths);
}
if (_settings.checkConfiguration) {
return 0;
}
// Run rules on this code
for (std::list<Settings::Rule>::const_iterator it = _settings.rules.begin(); it != _settings.rules.end(); ++it) {
if (it->tokenlist == "define") {
Tokenizer tokenizer2(&_settings, this);
std::istringstream istr2(filedata);
tokenizer2.list.createTokens(istr2, filename);
for (const Token *tok = tokenizer2.list.front(); tok; tok = tok->next()) {
if (tok->str() == "#define") {
std::string code = std::string(tok->linenr()-1U, '\n');
for (const Token *tok2 = tok; tok2 && tok2->linenr() == tok->linenr(); tok2 = tok2->next())
code += " " + tok2->str();
Tokenizer tokenizer3(&_settings, this);
std::istringstream istr3(code);
tokenizer3.list.createTokens(istr3, tokenizer2.list.file(tok));
executeRules("define", tokenizer3);
}
}
break;
}
}
if (!_settings.userDefines.empty() && _settings._maxConfigs==1U) {
configurations.clear();
configurations.push_back(_settings.userDefines);
}
if (!_settings._force && configurations.size() > _settings._maxConfigs) {
if (_settings.isEnabled("information")) {
tooManyConfigsError(Path::toNativeSeparators(filename),configurations.size());
} else {
tooManyConfigs = true;
}
}
std::set<unsigned long long> checksums;
unsigned int checkCount = 0;
for (std::list<std::string>::const_iterator it = configurations.begin(); it != configurations.end(); ++it) {
// Check only a few configurations (default 12), after that bail out, unless --force
// was used.
if (!_settings._force && ++checkCount > _settings._maxConfigs)
break;
cfg = *it;
// If only errors are printed, print filename after the check
if (_settings._errorsOnly == false && it != configurations.begin()) {
std::string fixedpath = Path::simplifyPath(filename);
fixedpath = Path::toNativeSeparators(fixedpath);
_errorLogger.reportOut(std::string("Checking ") + fixedpath + ": " + cfg + std::string("..."));
}
if (!_settings.userDefines.empty()) {
if (!cfg.empty())
cfg = ";" + cfg;
cfg = _settings.userDefines + cfg;
}
Timer t("Preprocessor::getcode", _settings._showtime, &S_timerResults);
const std::string codeWithoutCfg = preprocessor.getcode(filedata, cfg, filename);
t.Stop();
const std::string &appendCode = _settings.append();
if (_settings.debugFalsePositive) {
if (findError(codeWithoutCfg + appendCode, filename.c_str())) {
return exitcode;
}
} else {
if (!checkFile(codeWithoutCfg + appendCode, filename.c_str(), checksums)) {
if (_settings.isEnabled("information") && (_settings.debug || _settings._verbose))
purgedConfigurationMessage(filename, cfg);
}
}
}
} catch (const std::runtime_error &e) {
internalError(filename, e.what());
} catch (const InternalError &e) {
internalError(filename, e.errorMessage);
}
if (_settings.isEnabled("information") || _settings.checkConfiguration)
reportUnmatchedSuppressions(_settings.nomsg.getUnmatchedLocalSuppressions(filename, _settings._jobs == 1 && _settings.isEnabled("unusedFunction")));
_errorList.clear();
return exitcode;
}
void CppCheck::internalError(const std::string &filename, const std::string &msg)
{
const std::string fixedpath = Path::toNativeSeparators(filename);
const std::string fullmsg("Bailing out from checking " + fixedpath + " since there was a internal error: " + msg);
if (_settings.isEnabled("information")) {
const ErrorLogger::ErrorMessage::FileLocation loc1(filename, 0);
std::list<ErrorLogger::ErrorMessage::FileLocation> callstack;
callstack.push_back(loc1);
ErrorLogger::ErrorMessage errmsg(callstack,
Severity::information,
fullmsg,
"internalError",
false);
_errorLogger.reportErr(errmsg);
} else {
// Report on stdout
_errorLogger.reportOut(fullmsg);
}
}
void CppCheck::checkFunctionUsage()
{
// This generates false positives - especially for libraries
if (_settings.isEnabled("unusedFunction") && _settings._jobs == 1) {
const bool verbose_orig = _settings._verbose;
_settings._verbose = false;
if (_settings._errorsOnly == false)
_errorLogger.reportOut("Checking usage of global functions..");
CheckUnusedFunctions::instance.check(this);
_settings._verbose = verbose_orig;
}
}
void CppCheck::analyseFile(std::istream &fin, const std::string &filename)
{
// Preprocess file..
Preprocessor preprocessor(&_settings, this);
std::list<std::string> configurations;
std::string filedata = "";
preprocessor.preprocess(fin, filedata, configurations, filename, _settings._includePaths);
const std::string code = preprocessor.getcode(filedata, "", filename);
if (_settings.checkConfiguration) {
return;
}
// Tokenize..
Tokenizer tokenizer(&_settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename.c_str(), "");
tokenizer.simplifyTokenList2();
// Analyse the tokens..
std::set<std::string> data;
for (std::list<Check *>::const_iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {
(*it)->analyse(tokenizer.tokens(), data);
}
// Save analysis results..
// TODO: This loop should be protected by a mutex or something like that
// The saveAnalysisData must _not_ be called from many threads at the same time.
for (std::list<Check *>::const_iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {
(*it)->saveAnalysisData(data);
}
}
//---------------------------------------------------------------------------
// CppCheck - A function that checks a specified file
//---------------------------------------------------------------------------
bool CppCheck::checkFile(const std::string &code, const char FileName[], std::set<unsigned long long>& checksums)
{
if (_settings.terminated() || _settings.checkConfiguration)
return true;
Tokenizer _tokenizer(&_settings, this);
if (_settings._showtime != SHOWTIME_NONE)
_tokenizer.setTimerResults(&S_timerResults);
try {
bool result;
// Execute rules for "raw" code
for (std::list<Settings::Rule>::const_iterator it = _settings.rules.begin(); it != _settings.rules.end(); ++it) {
if (it->tokenlist == "raw") {
Tokenizer tokenizer2(&_settings, this);
std::istringstream istr(code);
tokenizer2.list.createTokens(istr, FileName);
executeRules("raw", tokenizer2);
break;
}
}
// Tokenize the file
std::istringstream istr(code);
Timer timer("Tokenizer::tokenize", _settings._showtime, &S_timerResults);
result = _tokenizer.tokenize(istr, FileName, cfg);
timer.Stop();
unsigned long long checksum = _tokenizer.list.calculateChecksum();
if (checksums.find(checksum) != checksums.end())
return false;
checksums.insert(checksum);
if (!result) {
// File had syntax errors, abort
return true;
}
// dump
if (_settings.dump) {
std::string dumpfile = std::string(FileName) + ".dump";
std::ofstream fdump(dumpfile.c_str());
if (fdump.is_open()) {
fdump << "<?xml version=\"1.0\"?>" << std::endl;
fdump << "<dump cfg=\"" << cfg << "\">" << std::endl;
_tokenizer.dump(fdump);
fdump << "</dump>" << std::endl;
}
return true;
}
// call all "runChecks" in all registered Check classes
for (std::list<Check *>::const_iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {
if (_settings.terminated())
return true;
Timer timerRunChecks((*it)->name() + "::runChecks", _settings._showtime, &S_timerResults);
(*it)->runChecks(&_tokenizer, &_settings, this);
}
if (_settings.isEnabled("unusedFunction") && _settings._jobs == 1)
CheckUnusedFunctions::instance.parseTokens(_tokenizer, FileName, &_settings);
executeRules("normal", _tokenizer);
if (!_simplify)
return true;
Timer timer3("Tokenizer::simplifyTokenList2", _settings._showtime, &S_timerResults);
result = _tokenizer.simplifyTokenList2();
timer3.Stop();
if (!result)
return true;
// call all "runSimplifiedChecks" in all registered Check classes
for (std::list<Check *>::const_iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {
if (_settings.terminated())
return true;
Timer timerSimpleChecks((*it)->name() + "::runSimplifiedChecks", _settings._showtime, &S_timerResults);
(*it)->runSimplifiedChecks(&_tokenizer, &_settings, this);
}
if (_settings.terminated())
return true;
executeRules("simple", _tokenizer);
if (_settings.terminated())
return true;
} catch (const InternalError &e) {
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
ErrorLogger::ErrorMessage::FileLocation loc;
if (e.token) {
loc.line = e.token->linenr();
const std::string fixedpath = Path::toNativeSeparators(_tokenizer.list.file(e.token));
loc.setfile(fixedpath);
} else {
ErrorLogger::ErrorMessage::FileLocation loc2;
loc2.setfile(Path::toNativeSeparators(FileName));
locationList.push_back(loc2);
loc.setfile(_tokenizer.list.getSourceFilePath());
}
locationList.push_back(loc);
const ErrorLogger::ErrorMessage errmsg(locationList,
Severity::error,
e.errorMessage,
e.id,
false);
_errorLogger.reportErr(errmsg);
}
return true;
}
void CppCheck::executeRules(const std::string &tokenlist, const Tokenizer &tokenizer)
{
(void)tokenlist;
(void)tokenizer;
#ifdef HAVE_RULES
// Are there rules to execute?
bool isrule = false;
for (std::list<Settings::Rule>::const_iterator it = _settings.rules.begin(); it != _settings.rules.end(); ++it) {
if (it->tokenlist == tokenlist)
isrule = true;
}
// There is no rule to execute
if (isrule == false)
return;
// Write all tokens in a string that can be parsed by pcre
std::ostringstream ostr;
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next())
ostr << " " << tok->str();
const std::string str(ostr.str());
for (std::list<Settings::Rule>::const_iterator it = _settings.rules.begin(); it != _settings.rules.end(); ++it) {
const Settings::Rule &rule = *it;
if (rule.pattern.empty() || rule.id.empty() || rule.severity.empty() || rule.tokenlist != tokenlist)
continue;
const char *error = nullptr;
int erroffset = 0;
pcre *re = pcre_compile(rule.pattern.c_str(),0,&error,&erroffset,nullptr);
if (!re) {
if (error) {
ErrorLogger::ErrorMessage errmsg(std::list<ErrorLogger::ErrorMessage::FileLocation>(),
Severity::error,
error,
"pcre_compile",
false);
reportErr(errmsg);
}
continue;
}
int pos = 0;
int ovector[30];
while (pos < (int)str.size() && 0 <= pcre_exec(re, nullptr, str.c_str(), (int)str.size(), pos, 0, ovector, 30)) {
unsigned int pos1 = (unsigned int)ovector[0];
unsigned int pos2 = (unsigned int)ovector[1];
// jump to the end of the match for the next pcre_exec
pos = (int)pos2;
// determine location..
ErrorLogger::ErrorMessage::FileLocation loc;
loc.setfile(tokenizer.list.getSourceFilePath());
loc.line = 0;
std::size_t len = 0;
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next()) {
len = len + 1U + tok->str().size();
if (len > pos1) {
loc.setfile(tokenizer.list.getFiles().at(tok->fileIndex()));
loc.line = tok->linenr();
break;
}
}
const std::list<ErrorLogger::ErrorMessage::FileLocation> callStack(1, loc);
// Create error message
std::string summary;
if (rule.summary.empty())
summary = "found '" + str.substr(pos1, pos2 - pos1) + "'";
else
summary = rule.summary;
const ErrorLogger::ErrorMessage errmsg(callStack, Severity::fromString(rule.severity), summary, rule.id, false);
// Report error
reportErr(errmsg);
}
pcre_free(re);
}
#endif
}
Settings &CppCheck::settings()
{
return _settings;
}
void CppCheck::tooManyConfigsError(const std::string &file, const std::size_t numberOfConfigurations)
{
if (!_settings.isEnabled("information") && !tooManyConfigs)
return;
tooManyConfigs = false;
if (_settings.isEnabled("information") && file.empty())
return;
std::list<ErrorLogger::ErrorMessage::FileLocation> loclist;
if (!file.empty()) {
ErrorLogger::ErrorMessage::FileLocation location;
location.setfile(file);
loclist.push_back(location);
}
std::ostringstream msg;
msg << "Too many #ifdef configurations - cppcheck only checks " << _settings._maxConfigs;
if (numberOfConfigurations > _settings._maxConfigs)
msg << " of " << numberOfConfigurations << " configurations. Use --force to check all configurations.\n";
if (file.empty())
msg << " configurations. Use --force to check all configurations. For more details, use --enable=information.\n";
msg << "The checking of the file will be interrupted because there are too many "
"#ifdef configurations. Checking of all #ifdef configurations can be forced "
"by --force command line option or from GUI preferences. However that may "
"increase the checking time.";
if (file.empty())
msg << " For more details, use --enable=information.";
ErrorLogger::ErrorMessage errmsg(loclist,
Severity::information,
msg.str(),
"toomanyconfigs",
false);
reportErr(errmsg);
}
void CppCheck::purgedConfigurationMessage(const std::string &file, const std::string& configuration)
{
tooManyConfigs = false;
if (_settings.isEnabled("information") && file.empty())
return;
std::list<ErrorLogger::ErrorMessage::FileLocation> loclist;
if (!file.empty()) {
ErrorLogger::ErrorMessage::FileLocation location;
location.setfile(file);
loclist.push_back(location);
}
ErrorLogger::ErrorMessage errmsg(loclist,
Severity::information,
"The configuration '" + configuration + "' was not checked because its code equals another one.",
"toomanyconfigs",
false);
reportErr(errmsg);
}
//---------------------------------------------------------------------------
void CppCheck::reportErr(const ErrorLogger::ErrorMessage &msg)
{
if (!_settings.library.reportErrors(msg.file0))
return;
std::string errmsg = msg.toString(_settings._verbose);
if (errmsg.empty())
return;
// Alert only about unique errors
if (std::find(_errorList.begin(), _errorList.end(), errmsg) != _errorList.end())
return;
if (_settings.debugFalsePositive) {
// Don't print out error
_errorList.push_back(errmsg);
return;
}
std::string file;
unsigned int line(0);
if (!msg._callStack.empty()) {
file = msg._callStack.back().getfile(false);
line = msg._callStack.back().line;
}
if (_useGlobalSuppressions) {
if (_settings.nomsg.isSuppressed(msg._id, file, line))
return;
} else {
if (_settings.nomsg.isSuppressedLocal(msg._id, file, line))
return;
}
if (!_settings.nofail.isSuppressed(msg._id, file, line))
exitcode = 1;
_errorList.push_back(errmsg);
_errorLogger.reportErr(msg);
}
void CppCheck::reportOut(const std::string &outmsg)
{
_errorLogger.reportOut(outmsg);
}
void CppCheck::reportProgress(const std::string &filename, const char stage[], const std::size_t value)
{
_errorLogger.reportProgress(filename, stage, value);
}
void CppCheck::reportInfo(const ErrorLogger::ErrorMessage &msg)
{
// Suppressing info message?
std::string file;
unsigned int line(0);
if (!msg._callStack.empty()) {
file = msg._callStack.back().getfile(false);
line = msg._callStack.back().line;
}
if (_useGlobalSuppressions) {
if (_settings.nomsg.isSuppressed(msg._id, file, line))
return;
} else {
if (_settings.nomsg.isSuppressedLocal(msg._id, file, line))
return;
}
_errorLogger.reportInfo(msg);
}
void CppCheck::reportStatus(unsigned int /*fileindex*/, unsigned int /*filecount*/, std::size_t /*sizedone*/, std::size_t /*sizetotal*/)
{
}
void CppCheck::getErrorMessages()
{
tooManyConfigs = true;
tooManyConfigsError("",0U);
// call all "getErrorMessages" in all registered Check classes
for (std::list<Check *>::const_iterator it = Check::instances().begin(); it != Check::instances().end(); ++it)
(*it)->getErrorMessages(this, &_settings);
Tokenizer::getErrorMessages(this, &_settings);
Preprocessor::getErrorMessages(this, &_settings);
}
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