368 lines
12 KiB
C++
368 lines
12 KiB
C++
/*
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* cppcheck - c/c++ syntax checking
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* Copyright (C) 2007-2008 Daniel Marjamäki, Reijo Tomperi, Nicolas Le Cam
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/
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*/
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#include "cppcheck.h"
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#include "preprocessor.h" // preprocessor.
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#include "tokenize.h" // <- Tokenizer
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#include "checkmemoryleak.h"
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#include "checkbufferoverrun.h"
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#include "checkclass.h"
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#include "checkheaders.h"
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#include "checkother.h"
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#include "checkfunctionusage.h"
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#include "filelister.h"
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#include <algorithm>
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#include <sstream>
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#include <cstring>
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#include <fstream>
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#include <map>
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//---------------------------------------------------------------------------
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CppCheck::CppCheck( ErrorLogger &errorLogger )
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{
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_errorLogger = &errorLogger;
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}
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CppCheck::~CppCheck()
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{
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}
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void CppCheck::settings( const Settings &settings )
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{
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_settings = settings;
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}
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void CppCheck::addFile( const std::string &path )
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{
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_filenames.push_back( path );
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}
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void CppCheck::addFile( const std::string &path, const std::string &content )
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{
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_filenames.push_back( path );
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_fileContents[ path ] = content;
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}
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std::string CppCheck::parseFromArgs( int argc, const char* const argv[] )
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{
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std::vector<std::string> pathnames;
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for (int i = 1; i < argc; i++)
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{
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// Flag used for various purposes during debugging
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if (strcmp(argv[i],"--debug") == 0)
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_settings._debug = true;
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// Show all messages
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else if (strcmp(argv[i],"-a") == 0 || strcmp(argv[i],"--all") == 0)
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_settings._showAll = true;
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// Only print something when there are errors
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else if (strcmp(argv[i],"-q")==0 || strcmp(argv[i],"--quiet")==0)
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_settings._errorsOnly = true;
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// Checking coding style
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else if (strcmp(argv[i],"-s")==0 || strcmp(argv[i],"--style")==0)
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_settings._checkCodingStyle = true;
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// Verbose error messages (configuration info)
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else if (strcmp(argv[i],"-v")==0 || strcmp(argv[i],"--verbose")==0)
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_settings._verbose = true;
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// Force checking of files that have "too many" configurations
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else if (strcmp(argv[i],"-f")==0 || strcmp(argv[i],"--force")==0)
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_settings._force = true;
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else
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pathnames.push_back( argv[i] );
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}
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if( pathnames.size() > 0 )
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{
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// Execute RecursiveAddFiles() to each given file parameter
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std::vector<std::string>::const_iterator iter;
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for(iter=pathnames.begin(); iter!=pathnames.end(); iter++)
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FileLister::RecursiveAddFiles( _filenames, iter->c_str(), true );
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}
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if (_filenames.empty())
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{
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std::ostringstream oss;
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oss << "c++check 1.26\n"
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"\n"
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"C/C++ code checking\n"
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"\n"
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"Syntax:\n"
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" cppcheck [--all] [--quiet] [--style] [--verbose] [file or path1] [file or path]\n"
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"\n"
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"If path is given instead of filename, *.cpp, *.cxx, *.cc and *.c files are \n"
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"checked recursively from given directory.\n\n"
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"Options:\n"
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" -a, --all Make the checking more sensitive. More bugs are detected,\n"
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" but there are also more false positives\n"
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" -q, --quiet Only print error messages\n"
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" -s, --style Check coding style\n"
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" -v, --verbose More detailed error reports\n"
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" -f, --force Force checking on files that have \"too many\" configurations\n"
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"\n"
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"Example usage:\n"
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" # Recursively check ../myproject/ and print only most fatal errors:\n"
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" cppcheck --quiet ../myproject/\n"
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" # Check only files one.cpp and two.cpp and give all information there is:\n"
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" cppcheck -v -a -s one.cpp two.cpp\n";
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return oss.str();
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}
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// Check function usage if "--style" and "--all" was given.
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// There will be false positives for exported library functions
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if ( _settings._showAll && _settings._checkCodingStyle )
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_settings._checkFunctionUsage = true;
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return "";
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}
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void CppCheck::check()
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{
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_checkFunctionUsage.setErrorLogger( this );
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std::sort( _filenames.begin(), _filenames.end() );
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for (unsigned int c = 0; c < _filenames.size(); c++)
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{
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_errout.str("");
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std::string fname = _filenames[c];
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Preprocessor preprocessor;
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std::list<std::string> configurations;
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std::string filedata = "";
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if( _fileContents.size() > 0 && _fileContents.find( _filenames[c] ) != _fileContents.end() )
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{
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// File content was given as a string
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std::istringstream iss( _fileContents[ _filenames[c] ] );
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preprocessor.preprocess(iss, fname, filedata, configurations );
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}
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else
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{
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// Only file name was given, read the content from file
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std::ifstream fin( fname.c_str() );
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preprocessor.preprocess(fin, fname, filedata, configurations );
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}
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int checkCount = 0;
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for ( std::list<std::string>::const_iterator it = configurations.begin(); it != configurations.end(); ++it )
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{
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// Check only 12 first configurations, after that bail out, unless --force
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// was used.
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if( !_settings._force && checkCount > 11 )
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{
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if( _settings._errorsOnly == false )
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_errorLogger->reportOut( std::string( "Bailing out from checking " ) + fname + ": Too many configurations. Recheck this file with --force if you want to check them all." );
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break;
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}
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cfg = *it;
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std::string codeWithoutCfg = Preprocessor::getcode( filedata, *it );
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// If only errors are printed, print filename after the check
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if ( _settings._errorsOnly == false )
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_errorLogger->reportOut( std::string( "Checking " ) + fname + ": "+cfg+std::string( "..." ) );
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checkFile( codeWithoutCfg, _filenames[c].c_str());
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checkCount++;
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}
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if ( _settings._errorsOnly == false && _errout.str().empty() )
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_errorLogger->reportOut( "No errors found" );
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}
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// This generates false positives - especially for libraries
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_settings._verbose = false;
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if ( _settings._checkFunctionUsage )
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{
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_errout.str("");
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if( _settings._errorsOnly == false )
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_errorLogger->reportOut( "Checking usage of global functions (this may take several minutes).." );
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_checkFunctionUsage.check();
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}
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_errorList.clear();
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}
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//---------------------------------------------------------------------------
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// CppCheck - A function that checks a specified file
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//---------------------------------------------------------------------------
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void CppCheck::checkFile(const std::string &code, const char FileName[])
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{
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Tokenizer _tokenizer;
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// Tokenize the file
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{
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std::istringstream istr(code);
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_tokenizer.tokenize(istr, FileName);
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}
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// Set variable id
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_tokenizer.setVarId();
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_tokenizer.fillFunctionList();
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// Check that the memsets are valid.
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// The 'memset' function can do dangerous things if used wrong.
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// Important: The checking doesn't work on simplified tokens list.
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CheckClass checkClass( &_tokenizer, _settings, this );
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checkClass.noMemset();
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// Check for unsigned divisions where one operand is signed
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// Very important to run it before 'SimplifyTokenList'
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CheckOther checkOther( &_tokenizer, this );
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if ( _settings._checkCodingStyle )
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checkOther.CheckUnsignedDivision();
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// Give warning when using char variable as array index
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// Doesn't work on simplified token list ('unsigned')
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if ( _settings._checkCodingStyle )
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checkOther.CheckCharVariable();
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// Including header which is not needed (too many false positives)
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// if ( _settings._checkCodingStyle )
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// {
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// CheckHeaders checkHeaders( &tokenizer );
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// checkHeaders.WarningIncludeHeader();
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// }
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_tokenizer.simplifyTokenList();
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if ( _settings._checkFunctionUsage )
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_checkFunctionUsage.parseTokens(_tokenizer);
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// Memory leak
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CheckMemoryLeakClass checkMemoryLeak( &_tokenizer, _settings, this );
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checkMemoryLeak.CheckMemoryLeak();
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// Buffer overruns..
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CheckBufferOverrunClass checkBufferOverrun( &_tokenizer, _settings, this );
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checkBufferOverrun.bufferOverrun();
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// Check that all class constructors are ok.
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checkClass.constructors();
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// Check that all base classes have virtual destructors
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checkClass.virtualDestructor();
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if (_settings._showAll)
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{
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// Check for "if (a=b)"
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checkOther.CheckIfAssignment();
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// Check for case without break
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// Disabled because it generates many false positives
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// CheckCaseWithoutBreak();
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// Dangerous usage of strtok
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// Disabled because it generates false positives
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//WarningStrTok();
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}
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// Dangerous functions, such as 'gets' and 'scanf'
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checkBufferOverrun.dangerousFunctions();
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// Invalid function usage..
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checkOther.InvalidFunctionUsage();
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if (_settings._checkCodingStyle)
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{
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// Check that all private functions are called.
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checkClass.privateFunctions();
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// Warning upon c-style pointer casts
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const char *ext = strrchr(FileName, '.');
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if (ext && strcmp(ext,".cpp")==0)
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checkOther.WarningOldStylePointerCast();
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checkClass.operatorEq();
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// if (a) delete a;
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checkOther.WarningRedundantCode();
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// if (condition);
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checkOther.WarningIf();
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// Variable scope (check if the scope could be limited)
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//CheckVariableScope();
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// Check if a constant function parameter is passed by value
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checkOther.CheckConstantFunctionParameter();
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// Unused struct members..
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checkOther.CheckStructMemberUsage();
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// Check for various types of incomplete statements that could for example
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// mean that an ';' has been added by accident
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checkOther.CheckIncompleteStatement();
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// Unreachable code below a 'return' statement
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checkOther.unreachableCode();
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// Usage of local functions
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checkOther.functionVariableUsage();
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}
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}
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//---------------------------------------------------------------------------
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void CppCheck::reportErr( const std::string &errmsg)
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{
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if ( /*OnlyReportUniqueErrors*/ true )
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{
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if ( std::find( _errorList.begin(), _errorList.end(), errmsg ) != _errorList.end() )
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return;
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_errorList.push_back( errmsg );
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}
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std::string errmsg2( errmsg );
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if ( _settings._verbose )
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{
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errmsg2 += "\n Defines=\'" + cfg + "\'\n";
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}
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_errorLogger->reportErr( errmsg2 );
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_errout << errmsg2 << std::endl;
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}
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void CppCheck::reportOut( const std::string &outmsg)
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{
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// This is currently never called. It is here just to comply with
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// the interface.
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}
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