cppcheck/cppcheck.cpp

365 lines
11 KiB
C++

/*
* c++check - c/c++ syntax checking
* Copyright (C) 2007-2008 Daniel Marjamäki and Reijo Tomperi
*
* 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 "CheckMemoryLeak.h"
#include "CheckBufferOverrun.h"
#include "CheckClass.h"
#include "CheckHeaders.h"
#include "CheckOther.h"
#include "CheckFunctionUsage.h"
#include "FileLister.h"
#include <algorithm>
#include <sstream>
#include <cstring>
#include <fstream>
#include <map>
//---------------------------------------------------------------------------
CppCheck::CppCheck( ErrorLogger &errorLogger ) : _checkFunctionUsage( this )
{
_errorLogger = &errorLogger;
}
CppCheck::~CppCheck()
{
}
void CppCheck::settings( const Settings &settings )
{
_settings = settings;
}
void CppCheck::addFile( const std::string &path )
{
_filenames.push_back( path );
}
void CppCheck::addFile( const std::string &path, const std::string &content )
{
_filenames.push_back( path );
_fileContents[ path ] = content;
}
std::string CppCheck::parseFromArgs( int argc, const char* const argv[] )
{
std::vector<std::string> pathnames;
bool Recursive = false;
for (int i = 1; i < argc; i++)
{
// Flag used for various purposes during debugging
if (strcmp(argv[i],"--debug") == 0)
_settings._debug = true;
// Show all messages
else if (strcmp(argv[i],"--all") == 0)
_settings._showAll = true;
// Only print something when there are errors
else if (strcmp(argv[i],"--errorsonly")==0)
_settings._errorsOnly = true;
// Checking coding style
else if (strcmp(argv[i],"--style")==0)
_settings._checkCodingStyle = true;
// Recursively check source files
else if (strcmp(argv[i],"--recursive")==0)
Recursive = true;
// Verbose error messages (configuration info)
else if (strcmp(argv[i],"--verbose")==0)
_settings._verbose = true;
else
pathnames.push_back( argv[i] );
}
// --recursive was used
if ( Recursive )
{
if( pathnames.size() == 0 )
{
// Handle situation: cppcheck --recursive
FileLister::RecursiveAddFiles( _filenames, "", true );
}
else
{
// Handle situation: cppcheck --recursive path1 path2
// Execute RecursiveAddFiles() to each given file parameter
std::vector<std::string>::const_iterator iter;
for(iter=pathnames.begin(); iter!=pathnames.end(); iter++)
FileLister::RecursiveAddFiles( _filenames, iter->c_str(), true );
}
}
else
{
std::vector<std::string>::const_iterator iter;
for(iter=pathnames.begin(); iter!=pathnames.end(); iter++)
FileLister::RecursiveAddFiles( _filenames, iter->c_str(), false );
}
if (_filenames.empty())
{
std::ostringstream oss;
oss << "c++check 1.26\n"
"\n"
"C/C++ code checking\n"
"\n"
"Syntax:\n"
" cppcheck [--all] [--errorsonly] [--recursive] [--style] [--verbose] [filename1] [filename2]\n"
"\n"
"Options:\n"
" --all Make the checking more sensitive. More bugs are detected,\n"
" but there are also more false positives\n"
" --errorsonly Only print error messages\n"
" --recursive Recursively check all *.cpp, *.cxx, *.cc and *.c files\n"
" --style Check coding style\n"
" --verbose More detailed error reports\n";
return oss.str();
}
// Check function usage if "--style" and "--all" was given.
// There will be false positives for exported library functions
if ( _settings._showAll && _settings._checkCodingStyle )
_settings._checkFunctionUsage = true;
return "";
}
void CppCheck::check()
{
std::sort( _filenames.begin(), _filenames.end() );
for (unsigned int c = 0; c < _filenames.size(); c++)
{
_errout.str("");
std::string fname = _filenames[c];
// If only errors are printed, print filename after the check
if ( _settings._errorsOnly == false )
_errorLogger->reportOut( std::string( "Checking " ) + fname + std::string( "..." ) );
Preprocessor preprocessor;
std::map<std::string, std::string> code;
if( _fileContents.size() > 0 && _fileContents.find( _filenames[c] ) != _fileContents.end() )
{
// File content was given as a string
std::istringstream iss( _fileContents[ _filenames[c] ] );
preprocessor.preprocess(iss, code, fname);
}
else
{
// Only file name was given, read the content from file
std::ifstream fin( fname.c_str() );
preprocessor.preprocess(fin, code, fname);
}
for ( std::map<std::string,std::string>::const_iterator it = code.begin(); it != code.end(); ++it )
{
cfg = it->first;
checkFile(it->second, _filenames[c].c_str());
}
if ( _settings._errorsOnly == false && _errout.str().empty() )
_errorLogger->reportOut( "No errors found" );
}
// This generates false positives - especially for libraries
_settings._verbose = false;
if ( _settings._checkFunctionUsage )
{
_errout.str("");
if( _settings._errorsOnly == false )
_errorLogger->reportOut( "Checking usage of global functions (this may take several minutes).." );
_checkFunctionUsage.check();
}
_errorList.clear();
}
//---------------------------------------------------------------------------
// CppCheck - A function that checks a specified file
//---------------------------------------------------------------------------
void CppCheck::checkFile(const std::string &code, const char FileName[])
{
Tokenizer _tokenizer;
// Tokenize the file
{
std::istringstream istr(code);
_tokenizer.tokenize(istr, FileName);
}
// Set variable id
_tokenizer.setVarId();
_tokenizer.fillFunctionList();
// Check that the memsets are valid.
// The 'memset' function can do dangerous things if used wrong.
// Important: The checking doesn't work on simplified tokens list.
CheckClass checkClass( &_tokenizer, _settings, this );
checkClass.CheckMemset();
// Check for unsigned divisions where one operand is signed
// Very important to run it before 'SimplifyTokenList'
CheckOther checkOther( &_tokenizer, this );
if ( _settings._checkCodingStyle )
checkOther.CheckUnsignedDivision();
// Give warning when using char variable as array index
// Doesn't work on simplified token list ('unsigned')
if ( _settings._checkCodingStyle )
checkOther.CheckCharVariable();
// Including header which is not needed (too many false positives)
// if ( _settings._checkCodingStyle )
// {
// CheckHeaders checkHeaders( &tokenizer );
// checkHeaders.WarningIncludeHeader();
// }
_tokenizer.simplifyTokenList();
if ( _settings._checkFunctionUsage )
_checkFunctionUsage.parseTokens(_tokenizer);
// Memory leak
CheckMemoryLeakClass checkMemoryLeak( &_tokenizer, _settings, this );
checkMemoryLeak.CheckMemoryLeak();
// Buffer overruns..
CheckBufferOverrunClass checkBufferOverrun( &_tokenizer, _settings, this );
checkBufferOverrun.CheckBufferOverrun();
// Check that all class constructors are ok.
checkClass.CheckConstructors();
// Check that all base classes have virtual destructors
checkClass.virtualDestructor();
if (_settings._showAll)
{
// Check for "if (a=b)"
checkOther.CheckIfAssignment();
// Check for case without break
// Disabled because it generates many false positives
// CheckCaseWithoutBreak();
// Dangerous usage of strtok
// Disabled because it generates false positives
//WarningStrTok();
}
// Dangerous functions, such as 'gets' and 'scanf'
checkBufferOverrun.WarningDangerousFunctions();
// Invalid function usage..
checkOther.InvalidFunctionUsage();
if (_settings._checkCodingStyle)
{
// Check that all private functions are called.
checkClass.CheckUnusedPrivateFunctions();
// Warning upon c-style pointer casts
const char *ext = strrchr(FileName, '.');
if (ext && strcmp(ext,".cpp")==0)
checkOther.WarningOldStylePointerCast();
// Use standard functions instead
checkOther.WarningIsDigit();
checkOther.WarningIsAlpha();
checkClass.CheckOperatorEq1();
// if (a) delete a;
checkOther.WarningRedundantCode();
// if (condition);
checkOther.WarningIf();
// Variable scope (check if the scope could be limited)
//CheckVariableScope();
// Check if a constant function parameter is passed by value
checkOther.CheckConstantFunctionParameter();
// Unused struct members..
checkOther.CheckStructMemberUsage();
// Check for various types of incomplete statements that could for example
// mean that an ';' has been added by accident
checkOther.CheckIncompleteStatement();
// Unreachable code below a 'return' statement
checkOther.unreachableCode();
// Usage of local functions
checkOther.functionVariableUsage();
}
}
//---------------------------------------------------------------------------
void CppCheck::reportErr( const std::string &errmsg)
{
if ( /*OnlyReportUniqueErrors*/ true )
{
if ( std::find( _errorList.begin(), _errorList.end(), errmsg ) != _errorList.end() )
return;
_errorList.push_back( errmsg );
}
std::string errmsg2( errmsg );
if ( _settings._verbose )
{
errmsg2 += "\n Defines=\'" + cfg + "\'\n";
}
_errorLogger->reportErr( errmsg2 );
_errout << errmsg2 << std::endl;
}
void CppCheck::reportOut( const std::string &outmsg)
{
// This is currently never called. It is here just to comply with
// the interface.
}