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cppcheck/lib/cppcheck.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2019 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 "check.h"
#include "checkunusedfunctions.h"
#include "ctu.h"
#include "library.h"
#include "mathlib.h"
#include "path.h"
#include "platform.h"
#include "preprocessor.h" // Preprocessor
#include "suppressions.h"
#include "timer.h"
#include "token.h"
#include "tokenize.h" // Tokenizer
#include "tokenlist.h"
#include "version.h"
#include "exprengine.h"
#define PICOJSON_USE_INT64
#include <picojson.h>
#include <simplecpp.h>
#include <tinyxml2.h>
#include <algorithm>
#include <cstring>
#include <new>
#include <set>
#include <stdexcept>
#include <vector>
#include <memory>
#include <iostream> // <- TEMPORARY
#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;
// CWE ids used
static const CWE CWE398(398U); // Indicator of Poor Code Quality
namespace {
struct AddonInfo {
std::string name;
std::string scriptFile;
std::string args;
static std::string getFullPath(const std::string &fileName, const std::string &exename) {
if (Path::fileExists(fileName))
return fileName;
const std::string exepath = Path::getPathFromFilename(exename);
if (Path::fileExists(exepath + fileName))
return exepath + fileName;
if (Path::fileExists(exepath + "addons/" + fileName))
return exepath + "addons/" + fileName;
#ifdef FILESDIR
if (Path::fileExists(FILESDIR + ("/" + fileName)))
return FILESDIR + ("/" + fileName);
if (Path::fileExists(FILESDIR + ("/addons/" + fileName)))
return FILESDIR + ("/addons/" + fileName);
#endif
return "";
}
std::string getAddonInfo(const std::string &fileName, const std::string &exename) {
if (fileName.find(".") == std::string::npos)
return getAddonInfo(fileName + ".py", exename);
if (endsWith(fileName, ".py", 3)) {
scriptFile = getFullPath(fileName, exename);
if (scriptFile.empty())
return "Did not find addon " + fileName;
std::string::size_type pos1 = scriptFile.rfind("/");
if (pos1 == std::string::npos)
pos1 = 0;
else
pos1++;
std::string::size_type pos2 = scriptFile.rfind(".");
if (pos2 < pos1)
pos2 = std::string::npos;
name = scriptFile.substr(pos1, pos2 - pos1);
return "";
}
if (!endsWith(fileName, ".json", 5))
return "Failed to open addon " + fileName;
std::ifstream fin(fileName);
if (!fin.is_open())
return "Failed to open " + fileName;
picojson::value json;
fin >> json;
if (!json.is<picojson::object>())
return "Loading " + fileName + " failed. Bad json.";
picojson::object obj = json.get<picojson::object>();
if (obj.count("args")) {
if (!obj["args"].is<picojson::array>())
return "Loading " + fileName + " failed. args must be array.";
for (const picojson::value &v : obj["args"].get<picojson::array>())
args += " " + v.get<std::string>();
}
return getAddonInfo(obj["script"].get<std::string>(), exename);
}
};
}
static std::string executeAddon(const AddonInfo &addonInfo, const std::string &dumpFile)
{
const std::string cmd = "python \"" + addonInfo.scriptFile + "\" --cli" + addonInfo.args + " \"" + dumpFile + "\"";
#ifdef _WIN32
std::unique_ptr<FILE, decltype(&_pclose)> pipe(_popen(cmd.c_str(), "r"), _pclose);
#else
std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd.c_str(), "r"), pclose);
#endif
if (!pipe)
return "";
char buffer[1024];
std::string result;
while (fgets(buffer, sizeof(buffer), pipe.get()) != nullptr) {
result += buffer;
}
return result;
}
static std::vector<std::string> split(const std::string &str, const std::string &sep)
{
std::vector<std::string> ret;
for (std::string::size_type defineStartPos = 0U; defineStartPos < str.size();) {
const std::string::size_type defineEndPos = str.find(sep, defineStartPos);
ret.push_back((defineEndPos == std::string::npos) ? str.substr(defineStartPos) : str.substr(defineStartPos, defineEndPos - defineStartPos));
if (defineEndPos == std::string::npos)
break;
defineStartPos = defineEndPos + 1U;
}
return ret;
}
CppCheck::CppCheck(ErrorLogger &errorLogger, bool useGlobalSuppressions)
: mErrorLogger(errorLogger), mExitCode(0), mSuppressInternalErrorFound(false), mUseGlobalSuppressions(useGlobalSuppressions), mTooManyConfigs(false), mSimplify(true)
{
}
CppCheck::~CppCheck()
{
while (!mFileInfo.empty()) {
delete mFileInfo.back();
mFileInfo.pop_back();
}
S_timerResults.ShowResults(mSettings.showtime);
}
const char * CppCheck::version()
{
return Version;
}
const char * CppCheck::extraVersion()
{
return ExtraVersion;
}
unsigned int CppCheck::check(const std::string &path)
{
std::ifstream fin(path);
return checkFile(Path::simplifyPath(path), emptyString, fin);
}
unsigned int CppCheck::check(const std::string &path, const std::string &content)
{
std::istringstream iss(content);
return checkFile(Path::simplifyPath(path), emptyString, iss);
}
unsigned int CppCheck::check(const ImportProject::FileSettings &fs)
{
CppCheck temp(mErrorLogger, mUseGlobalSuppressions);
temp.mSettings = mSettings;
if (!temp.mSettings.userDefines.empty())
temp.mSettings.userDefines += ';';
temp.mSettings.userDefines += fs.cppcheckDefines();
temp.mSettings.includePaths = fs.includePaths;
temp.mSettings.userUndefs = fs.undefs;
if (fs.platformType != Settings::Unspecified) {
temp.mSettings.platform(fs.platformType);
}
std::ifstream fin(fs.filename);
return temp.checkFile(Path::simplifyPath(fs.filename), fs.cfg, fin);
}
unsigned int CppCheck::checkFile(const std::string& filename, const std::string &cfgname, std::istream& fileStream)
{
mExitCode = 0;
mSuppressInternalErrorFound = false;
// only show debug warnings for accepted C/C++ source files
if (!Path::acceptFile(filename))
mSettings.debugwarnings = false;
if (mSettings.terminated())
return mExitCode;
if (!mSettings.quiet) {
std::string fixedpath = Path::simplifyPath(filename);
fixedpath = Path::toNativeSeparators(fixedpath);
mErrorLogger.reportOut(std::string("Checking ") + fixedpath + ' ' + cfgname + std::string("..."));
if (mSettings.verbose) {
mErrorLogger.reportOut("Defines:" + mSettings.userDefines);
std::string undefs;
for (const std::string& U : mSettings.userUndefs) {
if (!undefs.empty())
undefs += ';';
undefs += ' ' + U;
}
mErrorLogger.reportOut("Undefines:" + undefs);
std::string includePaths;
for (const std::string &I : mSettings.includePaths)
includePaths += " -I" + I;
mErrorLogger.reportOut("Includes:" + includePaths);
mErrorLogger.reportOut(std::string("Platform:") + mSettings.platformString());
}
}
if (plistFile.is_open()) {
plistFile << ErrorLogger::plistFooter();
plistFile.close();
}
CheckUnusedFunctions checkUnusedFunctions(nullptr, nullptr, nullptr);
try {
Preprocessor preprocessor(mSettings, this);
std::set<std::string> configurations;
simplecpp::OutputList outputList;
std::vector<std::string> files;
simplecpp::TokenList tokens1(fileStream, files, filename, &outputList);
// If there is a syntax error, report it and stop
for (const simplecpp::Output &output : outputList) {
bool err;
switch (output.type) {
case simplecpp::Output::ERROR:
case simplecpp::Output::INCLUDE_NESTED_TOO_DEEPLY:
case simplecpp::Output::SYNTAX_ERROR:
case simplecpp::Output::UNHANDLED_CHAR_ERROR:
err = true;
break;
case simplecpp::Output::WARNING:
case simplecpp::Output::MISSING_HEADER:
case simplecpp::Output::PORTABILITY_BACKSLASH:
err = false;
break;
};
if (err) {
const ErrorLogger::ErrorMessage::FileLocation loc1(output.location.file(), output.location.line, output.location.col);
std::list<ErrorLogger::ErrorMessage::FileLocation> callstack(1, loc1);
ErrorLogger::ErrorMessage errmsg(callstack,
"",
Severity::error,
output.msg,
"syntaxError",
false);
reportErr(errmsg);
return mExitCode;
}
}
preprocessor.loadFiles(tokens1, files);
if (!mSettings.plistOutput.empty()) {
std::string filename2;
if (filename.find('/') != std::string::npos)
filename2 = filename.substr(filename.rfind('/') + 1);
else
filename2 = filename;
filename2 = mSettings.plistOutput + filename2.substr(0, filename2.find('.')) + ".plist";
plistFile.open(filename2);
plistFile << ErrorLogger::plistHeader(version(), files);
}
// write dump file xml prolog
std::ofstream fdump;
std::string dumpFile;
if (mSettings.dump || !mSettings.addons.empty()) {
if (!mSettings.dumpFile.empty())
dumpFile = mSettings.dumpFile;
else if (!mSettings.dump && !mSettings.buildDir.empty())
dumpFile = AnalyzerInformation::getAnalyzerInfoFile(mSettings.buildDir, filename, "") + ".dump";
else
dumpFile = filename + ".dump";
fdump.open(dumpFile);
if (fdump.is_open()) {
fdump << "<?xml version=\"1.0\"?>" << std::endl;
fdump << "<dumps>" << std::endl;
fdump << " <platform"
<< " name=\"" << mSettings.platformString() << '\"'
<< " char_bit=\"" << mSettings.char_bit << '\"'
<< " short_bit=\"" << mSettings.short_bit << '\"'
<< " int_bit=\"" << mSettings.int_bit << '\"'
<< " long_bit=\"" << mSettings.long_bit << '\"'
<< " long_long_bit=\"" << mSettings.long_long_bit << '\"'
<< " pointer_bit=\"" << (mSettings.sizeof_pointer * mSettings.char_bit) << '\"'
<< "/>\n";
fdump << " <rawtokens>" << std::endl;
for (unsigned int i = 0; i < files.size(); ++i)
fdump << " <file index=\"" << i << "\" name=\"" << ErrorLogger::toxml(files[i]) << "\"/>" << std::endl;
for (const simplecpp::Token *tok = tokens1.cfront(); tok; tok = tok->next) {
fdump << " <tok "
<< "fileIndex=\"" << tok->location.fileIndex << "\" "
<< "linenr=\"" << tok->location.line << "\" "
<< "column=\"" << tok->location.col << "\" "
<< "str=\"" << ErrorLogger::toxml(tok->str()) << "\""
<< "/>" << std::endl;
}
fdump << " </rawtokens>" << std::endl;
}
}
// Parse comments and then remove them
preprocessor.inlineSuppressions(tokens1);
if ((mSettings.dump || !mSettings.addons.empty()) && fdump.is_open()) {
mSettings.nomsg.dump(fdump);
}
tokens1.removeComments();
preprocessor.removeComments();
if (!mSettings.buildDir.empty()) {
// Get toolinfo
std::ostringstream toolinfo;
toolinfo << CPPCHECK_VERSION_STRING;
toolinfo << (mSettings.isEnabled(Settings::WARNING) ? 'w' : ' ');
toolinfo << (mSettings.isEnabled(Settings::STYLE) ? 's' : ' ');
toolinfo << (mSettings.isEnabled(Settings::PERFORMANCE) ? 'p' : ' ');
toolinfo << (mSettings.isEnabled(Settings::PORTABILITY) ? 'p' : ' ');
toolinfo << (mSettings.isEnabled(Settings::INFORMATION) ? 'i' : ' ');
toolinfo << mSettings.userDefines;
mSettings.nomsg.dump(toolinfo);
// Calculate checksum so it can be compared with old checksum / future checksums
const unsigned int checksum = preprocessor.calculateChecksum(tokens1, toolinfo.str());
std::list<ErrorLogger::ErrorMessage> errors;
if (!mAnalyzerInformation.analyzeFile(mSettings.buildDir, filename, cfgname, checksum, &errors)) {
while (!errors.empty()) {
reportErr(errors.front());
errors.pop_front();
}
return mExitCode; // known results => no need to reanalyze file
}
}
// Get directives
preprocessor.setDirectives(tokens1);
preprocessor.simplifyPragmaAsm(&tokens1);
preprocessor.setPlatformInfo(&tokens1);
// Get configurations..
if (mSettings.userDefines.empty() || mSettings.force) {
Timer t("Preprocessor::getConfigs", mSettings.showtime, &S_timerResults);
configurations = preprocessor.getConfigs(tokens1);
} else {
configurations.insert(mSettings.userDefines);
}
if (mSettings.checkConfiguration) {
for (const std::string &config : configurations)
(void)preprocessor.getcode(tokens1, config, files, true);
return 0;
}
// Run define rules on raw code
for (const Settings::Rule &rule : mSettings.rules) {
if (rule.tokenlist != "define")
continue;
std::string code;
const std::list<Directive> &directives = preprocessor.getDirectives();
for (const Directive &dir : directives) {
if (dir.str.compare(0,8,"#define ") == 0)
code += "#line " + MathLib::toString(dir.linenr) + " \"" + dir.file + "\"\n" + dir.str + '\n';
}
Tokenizer tokenizer2(&mSettings, this);
std::istringstream istr2(code);
tokenizer2.list.createTokens(istr2);
executeRules("define", tokenizer2);
break;
}
if (!mSettings.force && configurations.size() > mSettings.maxConfigs) {
if (mSettings.isEnabled(Settings::INFORMATION)) {
tooManyConfigsError(Path::toNativeSeparators(filename),configurations.size());
} else {
mTooManyConfigs = true;
}
}
std::set<unsigned long long> checksums;
unsigned int checkCount = 0;
bool hasValidConfig = false;
std::list<std::string> configurationError;
for (const std::string &currCfg : configurations) {
// bail out if terminated
if (mSettings.terminated())
break;
// Check only a few configurations (default 12), after that bail out, unless --force
// was used.
if (!mSettings.force && ++checkCount > mSettings.maxConfigs)
break;
if (!mSettings.userDefines.empty()) {
mCurrentConfig = mSettings.userDefines;
const std::vector<std::string> v1(split(mSettings.userDefines, ";"));
for (const std::string &cfg: split(currCfg, ";")) {
if (std::find(v1.begin(), v1.end(), cfg) == v1.end()) {
mCurrentConfig += ";" + cfg;
}
}
} else {
mCurrentConfig = currCfg;
}
if (mSettings.preprocessOnly) {
Timer t("Preprocessor::getcode", mSettings.showtime, &S_timerResults);
std::string codeWithoutCfg = preprocessor.getcode(tokens1, mCurrentConfig, files, true);
t.Stop();
if (codeWithoutCfg.compare(0,5,"#file") == 0)
codeWithoutCfg.insert(0U, "//");
std::string::size_type pos = 0;
while ((pos = codeWithoutCfg.find("\n#file",pos)) != std::string::npos)
codeWithoutCfg.insert(pos+1U, "//");
pos = 0;
while ((pos = codeWithoutCfg.find("\n#endfile",pos)) != std::string::npos)
codeWithoutCfg.insert(pos+1U, "//");
pos = 0;
while ((pos = codeWithoutCfg.find(Preprocessor::macroChar,pos)) != std::string::npos)
codeWithoutCfg[pos] = ' ';
reportOut(codeWithoutCfg);
continue;
}
Tokenizer mTokenizer(&mSettings, this);
if (mSettings.showtime != SHOWTIME_MODES::SHOWTIME_NONE)
mTokenizer.setTimerResults(&S_timerResults);
try {
bool result;
// Create tokens, skip rest of iteration if failed
Timer timer("Tokenizer::createTokens", mSettings.showtime, &S_timerResults);
const simplecpp::TokenList &tokensP = preprocessor.preprocess(tokens1, mCurrentConfig, files, true);
mTokenizer.createTokens(&tokensP);
timer.Stop();
hasValidConfig = true;
// If only errors are printed, print filename after the check
if (!mSettings.quiet && (!mCurrentConfig.empty() || checkCount > 1)) {
std::string fixedpath = Path::simplifyPath(filename);
fixedpath = Path::toNativeSeparators(fixedpath);
mErrorLogger.reportOut("Checking " + fixedpath + ": " + mCurrentConfig + "...");
}
if (tokensP.empty())
continue;
// skip rest of iteration if just checking configuration
if (mSettings.checkConfiguration)
continue;
// Check raw tokens
checkRawTokens(mTokenizer);
// Simplify tokens into normal form, skip rest of iteration if failed
Timer timer2("Tokenizer::simplifyTokens1", mSettings.showtime, &S_timerResults);
result = mTokenizer.simplifyTokens1(mCurrentConfig);
timer2.Stop();
if (!result)
continue;
// dump xml if --dump
if ((mSettings.dump || !mSettings.addons.empty()) && fdump.is_open()) {
fdump << "<dump cfg=\"" << ErrorLogger::toxml(mCurrentConfig) << "\">" << std::endl;
fdump << " <standards>" << std::endl;
fdump << " <c version=\"" << mSettings.standards.getC() << "\"/>" << std::endl;
fdump << " <cpp version=\"" << mSettings.standards.getCPP() << "\"/>" << std::endl;
fdump << " </standards>" << std::endl;
preprocessor.dump(fdump);
mTokenizer.dump(fdump);
fdump << "</dump>" << std::endl;
}
// Skip if we already met the same simplified token list
if (mSettings.force || mSettings.maxConfigs > 1) {
const unsigned long long checksum = mTokenizer.list.calculateChecksum();
if (checksums.find(checksum) != checksums.end()) {
if (mSettings.debugwarnings)
purgedConfigurationMessage(filename, mCurrentConfig);
continue;
}
checksums.insert(checksum);
}
// Check normal tokens
checkNormalTokens(mTokenizer);
// Analyze info..
if (!mSettings.buildDir.empty())
checkUnusedFunctions.parseTokens(mTokenizer, filename.c_str(), &mSettings);
// simplify more if required, skip rest of iteration if failed
if (mSimplify && hasRule("simple")) {
// if further simplification fails then skip rest of iteration
Timer timer3("Tokenizer::simplifyTokenList2", mSettings.showtime, &S_timerResults);
result = mTokenizer.simplifyTokenList2();
timer3.Stop();
if (!result)
continue;
if (!mSettings.terminated())
executeRules("simple", mTokenizer);
}
} catch (const simplecpp::Output &o) {
// #error etc during preprocessing
configurationError.push_back((mCurrentConfig.empty() ? "\'\'" : mCurrentConfig) + " : [" + o.location.file() + ':' + MathLib::toString(o.location.line) + "] " + o.msg);
--checkCount; // don't count invalid configurations
continue;
} catch (const InternalError &e) {
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
if (e.token) {
ErrorLogger::ErrorMessage::FileLocation loc(e.token, &mTokenizer.list);
locationList.push_back(loc);
} else {
ErrorLogger::ErrorMessage::FileLocation loc(mTokenizer.list.getSourceFilePath(), 0, 0);
ErrorLogger::ErrorMessage::FileLocation loc2(filename, 0, 0);
locationList.push_back(loc2);
locationList.push_back(loc);
}
ErrorLogger::ErrorMessage errmsg(locationList,
mTokenizer.list.getSourceFilePath(),
Severity::error,
e.errorMessage,
e.id,
false);
if (errmsg.severity == Severity::error || mSettings.isEnabled(errmsg.severity))
reportErr(errmsg);
}
}
if (!hasValidConfig && configurations.size() > 1 && mSettings.isEnabled(Settings::INFORMATION)) {
std::string msg;
msg = "This file is not analyzed. Cppcheck failed to extract a valid configuration. Use -v for more details.";
msg += "\nThis file is not analyzed. Cppcheck failed to extract a valid configuration. The tested configurations have these preprocessor errors:";
for (const std::string &s : configurationError)
msg += '\n' + s;
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
ErrorLogger::ErrorMessage::FileLocation loc;
loc.setfile(Path::toNativeSeparators(filename));
locationList.push_back(loc);
ErrorLogger::ErrorMessage errmsg(locationList,
loc.getfile(),
Severity::information,
msg,
"noValidConfiguration",
false);
reportErr(errmsg);
}
// dumped all configs, close root </dumps> element now
if ((mSettings.dump || !mSettings.addons.empty()) && fdump.is_open())
fdump << "</dumps>" << std::endl;
if (!mSettings.addons.empty()) {
fdump.close();
for (const std::string &addon : mSettings.addons) {
struct AddonInfo addonInfo;
const std::string &failedToGetAddonInfo = addonInfo.getAddonInfo(addon, mSettings.exename);
if (!failedToGetAddonInfo.empty()) {
reportOut(failedToGetAddonInfo);
continue;
}
const std::string results = executeAddon(addonInfo, dumpFile);
std::istringstream istr(results);
std::string line;
while (std::getline(istr, line)) {
if (line.compare(0,1,"{") != 0)
continue;
picojson::value res;
std::istringstream istr2(line);
istr2 >> res;
if (!res.is<picojson::object>())
continue;
picojson::object obj = res.get<picojson::object>();
const std::string fileName = obj["file"].get<std::string>();
const int64_t lineNumber = obj["linenr"].get<int64_t>();
const int64_t column = obj["column"].get<int64_t>();
ErrorLogger::ErrorMessage errmsg;
errmsg.callStack.emplace_back(ErrorLogger::ErrorMessage::FileLocation(fileName, lineNumber, column));
errmsg.id = obj["addon"].get<std::string>() + "-" + obj["errorId"].get<std::string>();
const std::string text = obj["message"].get<std::string>();
errmsg.setmsg(text);
const std::string severity = obj["severity"].get<std::string>();
errmsg.severity = Severity::fromString(severity);
if (errmsg.severity == Severity::SeverityType::none)
continue;
errmsg.file0 = fileName;
reportErr(errmsg);
}
}
}
} catch (const std::runtime_error &e) {
internalError(filename, e.what());
} catch (const std::bad_alloc &e) {
internalError(filename, e.what());
} catch (const InternalError &e) {
internalError(filename, e.errorMessage);
mExitCode=1; // e.g. reflect a syntax error
}
mAnalyzerInformation.setFileInfo("CheckUnusedFunctions", checkUnusedFunctions.analyzerInfo());
mAnalyzerInformation.close();
// In jointSuppressionReport mode, unmatched suppressions are
// collected after all files are processed
if (!mSettings.jointSuppressionReport && (mSettings.isEnabled(Settings::INFORMATION) || mSettings.checkConfiguration)) {
reportUnmatchedSuppressions(mSettings.nomsg.getUnmatchedLocalSuppressions(filename, isUnusedFunctionCheckEnabled()));
}
mErrorList.clear();
return mExitCode;
}
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 an internal error: " + msg);
if (mSettings.isEnabled(Settings::INFORMATION)) {
const ErrorLogger::ErrorMessage::FileLocation loc1(filename, 0, 0);
std::list<ErrorLogger::ErrorMessage::FileLocation> callstack(1, loc1);
ErrorLogger::ErrorMessage errmsg(callstack,
emptyString,
Severity::information,
fullmsg,
"internalError",
false);
mErrorLogger.reportErr(errmsg);
} else {
// Report on stdout
mErrorLogger.reportOut(fullmsg);
}
}
//---------------------------------------------------------------------------
// CppCheck - A function that checks a raw token list
//---------------------------------------------------------------------------
void CppCheck::checkRawTokens(const Tokenizer &tokenizer)
{
// Execute rules for "raw" code
executeRules("raw", tokenizer);
}
//---------------------------------------------------------------------------
// CppCheck - A function that checks a normal token list
//---------------------------------------------------------------------------
void CppCheck::checkNormalTokens(const Tokenizer &tokenizer)
{
// call all "runChecks" in all registered Check classes
for (Check *check : Check::instances()) {
if (mSettings.terminated())
return;
if (tokenizer.isMaxTime())
return;
Timer timerRunChecks(check->name() + "::runChecks", mSettings.showtime, &S_timerResults);
check->runChecks(&tokenizer, &mSettings, this);
}
// Verification using ExprEngine..
if (mSettings.verification) {
ExprEngine::runChecks(this, &tokenizer, &mSettings);
}
// Analyse the tokens..
CTU::FileInfo *fi1 = CTU::getFileInfo(&tokenizer);
if (fi1) {
mFileInfo.push_back(fi1);
mAnalyzerInformation.setFileInfo("ctu", fi1->toString());
}
for (const Check *check : Check::instances()) {
Check::FileInfo *fi = check->getFileInfo(&tokenizer, &mSettings);
if (fi != nullptr) {
mFileInfo.push_back(fi);
mAnalyzerInformation.setFileInfo(check->name(), fi->toString());
}
}
executeRules("normal", tokenizer);
}
//---------------------------------------------------------------------------
bool CppCheck::hasRule(const std::string &tokenlist) const
{
#ifdef HAVE_RULES
for (const Settings::Rule &rule : mSettings.rules) {
if (rule.tokenlist == tokenlist)
return true;
}
#else
(void)tokenlist;
#endif
return false;
}
#ifdef HAVE_RULES
static const char * pcreErrorCodeToString(const int pcreExecRet)
{
switch (pcreExecRet) {
case PCRE_ERROR_NULL:
return "Either code or subject was passed as NULL, or ovector was NULL "
"and ovecsize was not zero (PCRE_ERROR_NULL)";
case PCRE_ERROR_BADOPTION:
return "An unrecognized bit was set in the options argument (PCRE_ERROR_BADOPTION)";
case PCRE_ERROR_BADMAGIC:
return "PCRE stores a 4-byte \"magic number\" at the start of the compiled code, "
"to catch the case when it is passed a junk pointer and to detect when a "
"pattern that was compiled in an environment of one endianness is run in "
"an environment with the other endianness. This is the error that PCRE "
"gives when the magic number is not present (PCRE_ERROR_BADMAGIC)";
case PCRE_ERROR_UNKNOWN_NODE:
return "While running the pattern match, an unknown item was encountered in the "
"compiled pattern. This error could be caused by a bug in PCRE or by "
"overwriting of the compiled pattern (PCRE_ERROR_UNKNOWN_NODE)";
case PCRE_ERROR_NOMEMORY:
return "If a pattern contains back references, but the ovector that is passed "
"to pcre_exec() is not big enough to remember the referenced substrings, "
"PCRE gets a block of memory at the start of matching to use for this purpose. "
"If the call via pcre_malloc() fails, this error is given. The memory is "
"automatically freed at the end of matching. This error is also given if "
"pcre_stack_malloc() fails in pcre_exec(). "
"This can happen only when PCRE has been compiled with "
"--disable-stack-for-recursion (PCRE_ERROR_NOMEMORY)";
case PCRE_ERROR_NOSUBSTRING:
return "This error is used by the pcre_copy_substring(), pcre_get_substring(), "
"and pcre_get_substring_list() functions (see below). "
"It is never returned by pcre_exec() (PCRE_ERROR_NOSUBSTRING)";
case PCRE_ERROR_MATCHLIMIT:
return "The backtracking limit, as specified by the match_limit field in a pcre_extra "
"structure (or defaulted) was reached. "
"See the description above (PCRE_ERROR_MATCHLIMIT)";
case PCRE_ERROR_CALLOUT:
return "This error is never generated by pcre_exec() itself. "
"It is provided for use by callout functions that want to yield a distinctive "
"error code. See the pcrecallout documentation for details (PCRE_ERROR_CALLOUT)";
case PCRE_ERROR_BADUTF8:
return "A string that contains an invalid UTF-8 byte sequence was passed as a subject, "
"and the PCRE_NO_UTF8_CHECK option was not set. If the size of the output vector "
"(ovecsize) is at least 2, the byte offset to the start of the the invalid UTF-8 "
"character is placed in the first element, and a reason code is placed in the "
"second element. The reason codes are listed in the following section. For "
"backward compatibility, if PCRE_PARTIAL_HARD is set and the problem is a truncated "
"UTF-8 character at the end of the subject (reason codes 1 to 5), "
"PCRE_ERROR_SHORTUTF8 is returned instead of PCRE_ERROR_BADUTF8";
case PCRE_ERROR_BADUTF8_OFFSET:
return "The UTF-8 byte sequence that was passed as a subject was checked and found to "
"be valid (the PCRE_NO_UTF8_CHECK option was not set), but the value of "
"startoffset did not point to the beginning of a UTF-8 character or the end of "
"the subject (PCRE_ERROR_BADUTF8_OFFSET)";
case PCRE_ERROR_PARTIAL:
return "The subject string did not match, but it did match partially. See the "
"pcrepartial documentation for details of partial matching (PCRE_ERROR_PARTIAL)";
case PCRE_ERROR_BADPARTIAL:
return "This code is no longer in use. It was formerly returned when the PCRE_PARTIAL "
"option was used with a compiled pattern containing items that were not supported "
"for partial matching. From release 8.00 onwards, there are no restrictions on "
"partial matching (PCRE_ERROR_BADPARTIAL)";
case PCRE_ERROR_INTERNAL:
return "An unexpected internal error has occurred. This error could be caused by a bug "
"in PCRE or by overwriting of the compiled pattern (PCRE_ERROR_INTERNAL)";
case PCRE_ERROR_BADCOUNT:
return"This error is given if the value of the ovecsize argument is negative "
"(PCRE_ERROR_BADCOUNT)";
case PCRE_ERROR_RECURSIONLIMIT :
return "The internal recursion limit, as specified by the match_limit_recursion "
"field in a pcre_extra structure (or defaulted) was reached. "
"See the description above (PCRE_ERROR_RECURSIONLIMIT)";
case PCRE_ERROR_DFA_UITEM:
return "PCRE_ERROR_DFA_UITEM";
case PCRE_ERROR_DFA_UCOND:
return "PCRE_ERROR_DFA_UCOND";
case PCRE_ERROR_DFA_WSSIZE:
return "PCRE_ERROR_DFA_WSSIZE";
case PCRE_ERROR_DFA_RECURSE:
return "PCRE_ERROR_DFA_RECURSE";
case PCRE_ERROR_NULLWSLIMIT:
return "PCRE_ERROR_NULLWSLIMIT";
case PCRE_ERROR_BADNEWLINE:
return "An invalid combination of PCRE_NEWLINE_xxx options was "
"given (PCRE_ERROR_BADNEWLINE)";
case PCRE_ERROR_BADOFFSET:
return "The value of startoffset was negative or greater than the length "
"of the subject, that is, the value in length (PCRE_ERROR_BADOFFSET)";
case PCRE_ERROR_SHORTUTF8:
return "This error is returned instead of PCRE_ERROR_BADUTF8 when the subject "
"string ends with a truncated UTF-8 character and the PCRE_PARTIAL_HARD option is set. "
"Information about the failure is returned as for PCRE_ERROR_BADUTF8. "
"It is in fact sufficient to detect this case, but this special error code for "
"PCRE_PARTIAL_HARD precedes the implementation of returned information; "
"it is retained for backwards compatibility (PCRE_ERROR_SHORTUTF8)";
case PCRE_ERROR_RECURSELOOP:
return "This error is returned when pcre_exec() detects a recursion loop "
"within the pattern. Specifically, it means that either the whole pattern "
"or a subpattern has been called recursively for the second time at the same "
"position in the subject string. Some simple patterns that might do this "
"are detected and faulted at compile time, but more complicated cases, "
"in particular mutual recursions between two different subpatterns, "
"cannot be detected until run time (PCRE_ERROR_RECURSELOOP)";
case PCRE_ERROR_JIT_STACKLIMIT:
return "This error is returned when a pattern that was successfully studied "
"using a JIT compile option is being matched, but the memory available "
"for the just-in-time processing stack is not large enough. See the pcrejit "
"documentation for more details (PCRE_ERROR_JIT_STACKLIMIT)";
case PCRE_ERROR_BADMODE:
return "This error is given if a pattern that was compiled by the 8-bit library "
"is passed to a 16-bit or 32-bit library function, or vice versa (PCRE_ERROR_BADMODE)";
case PCRE_ERROR_BADENDIANNESS:
return "This error is given if a pattern that was compiled and saved is reloaded on a "
"host with different endianness. The utility function pcre_pattern_to_host_byte_order() "
"can be used to convert such a pattern so that it runs on the new host (PCRE_ERROR_BADENDIANNESS)";
case PCRE_ERROR_DFA_BADRESTART:
return "PCRE_ERROR_DFA_BADRESTART";
#if PCRE_MAJOR >= 8 && PCRE_MINOR >= 32
case PCRE_ERROR_BADLENGTH:
return "This error is given if pcre_exec() is called with a negative value for the length argument (PCRE_ERROR_BADLENGTH)";
case PCRE_ERROR_JIT_BADOPTION:
return "This error is returned when a pattern that was successfully studied using a JIT compile "
"option is being matched, but the matching mode (partial or complete match) does not correspond "
"to any JIT compilation mode. When the JIT fast path function is used, this error may be "
"also given for invalid options. See the pcrejit documentation for more details (PCRE_ERROR_JIT_BADOPTION)";
#endif
}
return "";
}
#endif // HAVE_RULES
void CppCheck::executeRules(const std::string &tokenlist, const Tokenizer &tokenizer)
{
(void)tokenlist;
(void)tokenizer;
#ifdef HAVE_RULES
// There is no rule to execute
if (!hasRule(tokenlist))
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 (const Settings::Rule &rule : mSettings.rules) {
if (rule.pattern.empty() || rule.id.empty() || rule.severity == Severity::none || rule.tokenlist != tokenlist)
continue;
const char *pcreCompileErrorStr = nullptr;
int erroffset = 0;
pcre * const re = pcre_compile(rule.pattern.c_str(),0,&pcreCompileErrorStr,&erroffset,nullptr);
if (!re) {
if (pcreCompileErrorStr) {
const std::string msg = "pcre_compile failed: " + std::string(pcreCompileErrorStr);
const ErrorLogger::ErrorMessage errmsg(std::list<ErrorLogger::ErrorMessage::FileLocation>(),
emptyString,
Severity::error,
msg,
"pcre_compile",
false);
reportErr(errmsg);
}
continue;
}
// Optimize the regex, but only if PCRE_CONFIG_JIT is available
#ifdef PCRE_CONFIG_JIT
const char *pcreStudyErrorStr = nullptr;
pcre_extra * const pcreExtra = pcre_study(re, PCRE_STUDY_JIT_COMPILE, &pcreStudyErrorStr);
// pcre_study() returns NULL for both errors and when it can not optimize the regex.
// The last argument is how one checks for errors.
// It is NULL if everything works, and points to an error string otherwise.
if (pcreStudyErrorStr) {
const std::string msg = "pcre_study failed: " + std::string(pcreStudyErrorStr);
const ErrorLogger::ErrorMessage errmsg(std::list<ErrorLogger::ErrorMessage::FileLocation>(),
emptyString,
Severity::error,
msg,
"pcre_study",
false);
reportErr(errmsg);
// pcre_compile() worked, but pcre_study() returned an error. Free the resources allocated by pcre_compile().
pcre_free(re);
continue;
}
#else
const pcre_extra * const pcreExtra = nullptr;
#endif
int pos = 0;
int ovector[30]= {0};
while (pos < (int)str.size()) {
const int pcreExecRet = pcre_exec(re, pcreExtra, str.c_str(), (int)str.size(), pos, 0, ovector, 30);
if (pcreExecRet < 0) {
const std::string errorMessage = pcreErrorCodeToString(pcreExecRet);
if (!errorMessage.empty()) {
const ErrorLogger::ErrorMessage errmsg(std::list<ErrorLogger::ErrorMessage::FileLocation>(),
emptyString,
Severity::error,
std::string("pcre_exec failed: ") + errorMessage,
"pcre_exec",
false);
reportErr(errmsg);
}
break;
}
const unsigned int pos1 = (unsigned int)ovector[0];
const 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, tokenizer.list.getSourceFilePath(), rule.severity, summary, rule.id, false);
// Report error
reportErr(errmsg);
}
pcre_free(re);
#ifdef PCRE_CONFIG_JIT
// Free up the EXTRA PCRE value (may be NULL at this point)
if (pcreExtra) {
pcre_free_study(pcreExtra);
}
#endif
}
#endif
}
Settings &CppCheck::settings()
{
return mSettings;
}
void CppCheck::tooManyConfigsError(const std::string &file, const std::size_t numberOfConfigurations)
{
if (!mSettings.isEnabled(Settings::INFORMATION) && !mTooManyConfigs)
return;
mTooManyConfigs = false;
if (mSettings.isEnabled(Settings::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 " << mSettings.maxConfigs;
if (numberOfConfigurations > mSettings.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,
emptyString,
Severity::information,
msg.str(),
"toomanyconfigs", CWE398,
false);
reportErr(errmsg);
}
void CppCheck::purgedConfigurationMessage(const std::string &file, const std::string& configuration)
{
mTooManyConfigs = false;
if (mSettings.isEnabled(Settings::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,
emptyString,
Severity::information,
"The configuration '" + configuration + "' was not checked because its code equals another one.",
"purgedConfiguration",
false);
reportErr(errmsg);
}
//---------------------------------------------------------------------------
void CppCheck::reportErr(const ErrorLogger::ErrorMessage &msg)
{
mSuppressInternalErrorFound = false;
if (!mSettings.library.reportErrors(msg.file0))
return;
const std::string errmsg = msg.toString(mSettings.verbose);
if (errmsg.empty())
return;
// Alert only about unique errors
if (std::find(mErrorList.begin(), mErrorList.end(), errmsg) != mErrorList.end())
return;
const Suppressions::ErrorMessage errorMessage = msg.toSuppressionsErrorMessage();
if (mUseGlobalSuppressions) {
if (mSettings.nomsg.isSuppressed(errorMessage)) {
mSuppressInternalErrorFound = true;
return;
}
} else {
if (mSettings.nomsg.isSuppressedLocal(errorMessage)) {
mSuppressInternalErrorFound = true;
return;
}
}
if (!mSettings.nofail.isSuppressed(errorMessage) && !mSettings.nomsg.isSuppressed(errorMessage)) {
mExitCode = 1;
}
mErrorList.push_back(errmsg);
mErrorLogger.reportErr(msg);
mAnalyzerInformation.reportErr(msg, mSettings.verbose);
if (!mSettings.plistOutput.empty() && plistFile.is_open()) {
plistFile << ErrorLogger::plistData(msg);
}
}
void CppCheck::reportOut(const std::string &outmsg)
{
mErrorLogger.reportOut(outmsg);
}
void CppCheck::reportProgress(const std::string &filename, const char stage[], const std::size_t value)
{
mErrorLogger.reportProgress(filename, stage, value);
}
void CppCheck::reportInfo(const ErrorLogger::ErrorMessage &msg)
{
const Suppressions::ErrorMessage &errorMessage = msg.toSuppressionsErrorMessage();
if (!mSettings.nomsg.isSuppressed(errorMessage))
mErrorLogger.reportInfo(msg);
}
void CppCheck::reportStatus(unsigned int /*fileindex*/, unsigned int /*filecount*/, std::size_t /*sizedone*/, std::size_t /*sizetotal*/)
{
}
void CppCheck::getErrorMessages()
{
Settings s(mSettings);
s.addEnabled("warning");
s.addEnabled("style");
s.addEnabled("portability");
s.addEnabled("performance");
s.addEnabled("information");
purgedConfigurationMessage("","");
mTooManyConfigs = 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, &s);
Preprocessor::getErrorMessages(this, &s);
}
bool CppCheck::analyseWholeProgram()
{
bool errors = false;
// Init CTU
CTU::maxCtuDepth = mSettings.maxCtuDepth;
// Analyse the tokens
CTU::FileInfo ctu;
for (const Check::FileInfo *fi : mFileInfo) {
const CTU::FileInfo *fi2 = dynamic_cast<const CTU::FileInfo *>(fi);
if (fi2) {
ctu.functionCalls.insert(ctu.functionCalls.end(), fi2->functionCalls.begin(), fi2->functionCalls.end());
ctu.nestedCalls.insert(ctu.nestedCalls.end(), fi2->nestedCalls.begin(), fi2->nestedCalls.end());
}
}
for (Check *check : Check::instances())
errors |= check->analyseWholeProgram(&ctu, mFileInfo, mSettings, *this); // TODO: ctu
return errors && (mExitCode > 0);
}
void CppCheck::analyseWholeProgram(const std::string &buildDir, const std::map<std::string, std::size_t> &files)
{
(void)files;
if (buildDir.empty())
return;
if (mSettings.isEnabled(Settings::UNUSED_FUNCTION))
CheckUnusedFunctions::analyseWholeProgram(this, buildDir);
std::list<Check::FileInfo*> fileInfoList;
CTU::FileInfo ctuFileInfo;
// Load all analyzer info data..
const std::string filesTxt(buildDir + "/files.txt");
std::ifstream fin(filesTxt);
std::string filesTxtLine;
while (std::getline(fin, filesTxtLine)) {
const std::string::size_type firstColon = filesTxtLine.find(':');
if (firstColon == std::string::npos)
continue;
const std::string::size_type lastColon = filesTxtLine.rfind(':');
if (firstColon == lastColon)
continue;
const std::string xmlfile = buildDir + '/' + filesTxtLine.substr(0,firstColon);
//const std::string sourcefile = filesTxtLine.substr(lastColon+1);
tinyxml2::XMLDocument doc;
const tinyxml2::XMLError error = doc.LoadFile(xmlfile.c_str());
if (error != tinyxml2::XML_SUCCESS)
continue;
const tinyxml2::XMLElement * const rootNode = doc.FirstChildElement();
if (rootNode == nullptr)
continue;
for (const tinyxml2::XMLElement *e = rootNode->FirstChildElement(); e; e = e->NextSiblingElement()) {
if (std::strcmp(e->Name(), "FileInfo") != 0)
continue;
const char *checkClassAttr = e->Attribute("check");
if (!checkClassAttr)
continue;
if (std::strcmp(checkClassAttr, "ctu") == 0) {
ctuFileInfo.loadFromXml(e);
continue;
}
for (Check *check : Check::instances()) {
if (checkClassAttr == check->name())
fileInfoList.push_back(check->loadFileInfoFromXml(e));
}
}
}
// Set CTU max depth
CTU::maxCtuDepth = mSettings.maxCtuDepth;
// Analyse the tokens
for (Check *check : Check::instances())
check->analyseWholeProgram(&ctuFileInfo, fileInfoList, mSettings, *this);
for (Check::FileInfo *fi : fileInfoList)
delete fi;
}
bool CppCheck::isUnusedFunctionCheckEnabled() const
{
return (mSettings.jobs == 1 && mSettings.isEnabled(Settings::UNUSED_FUNCTION));
}
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