1786 lines
75 KiB
C++
1786 lines
75 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2012 Daniel Marjamäki and Cppcheck team.
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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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//---------------------------------------------------------------------------
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#include "checkclass.h"
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#include "tokenize.h"
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#include "token.h"
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#include "errorlogger.h"
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#include "symboldatabase.h"
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#include <string>
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#include <algorithm>
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#include <cctype>
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//---------------------------------------------------------------------------
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// Register CheckClass..
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namespace {
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CheckClass instance;
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}
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//---------------------------------------------------------------------------
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CheckClass::CheckClass(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger),
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symbolDatabase(tokenizer?tokenizer->getSymbolDatabase():NULL)
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{
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}
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//---------------------------------------------------------------------------
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// ClassCheck: Check that all class constructors are ok.
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//---------------------------------------------------------------------------
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void CheckClass::constructors()
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{
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if (!_settings->isEnabled("style"))
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return;
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const std::size_t classes = symbolDatabase->classAndStructScopes.size();
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for (std::size_t i = 0; i < classes; ++i) {
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const Scope * scope = symbolDatabase->classAndStructScopes[i];
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// skip forward declarations
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if (scope->isForwardDeclaration())
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continue;
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// don't check uninstantiated template classes
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if (scope->classDef->strAt(-1) == ">")
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continue;
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// There are no constructors.
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if (scope->numConstructors == 0) {
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// If there is a private variable, there should be a constructor..
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std::list<Variable>::const_iterator var;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var) {
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if (var->isPrivate() && !var->isClass() && !var->isStatic()) {
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noConstructorError(scope->classDef, scope->className, scope->classDef->str() == "struct");
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break;
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}
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}
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}
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// #3196 => bailout if there are nested unions
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// TODO: handle union variables better
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{
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bool bailout = false;
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for (std::list<Scope *>::const_iterator it = scope->nestedList.begin(); it != scope->nestedList.end(); ++it) {
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const Scope * const nestedScope = *it;
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if (nestedScope->type == Scope::eUnion) {
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bailout = true;
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break;
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}
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}
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if (bailout)
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continue;
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}
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std::list<Function>::const_iterator func;
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std::vector<Usage> usage(scope->varlist.size());
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for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
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if (!func->hasBody || !(func->type == Function::eConstructor ||
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func->type == Function::eCopyConstructor ||
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func->type == Function::eOperatorEqual))
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continue;
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// Mark all variables not used
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clearAllVar(usage);
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std::list<const Function *> callstack;
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initializeVarList(*func, callstack, &(*scope), usage);
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// Check if any variables are uninitialized
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count) {
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bool inconclusive = false;
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if (usage[count].assign || usage[count].init || var->isStatic())
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continue;
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if (var->isConst() && func->isOperator) // We can't set const members in assignment operator
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continue;
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// Check if this is a class constructor
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if (!var->isPointer() && var->isClass() && func->type == Function::eConstructor) {
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// Unknown type so assume it is initialized
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if (!var->type())
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continue;
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// Known type that doesn't need initialization or
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// known type that has member variables of an unknown type
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else if (var->type()->needInitialization != Scope::True)
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continue;
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}
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// Check if type can't be copied
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if (!var->isPointer() && var->type() && canNotCopy(var->type()))
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continue;
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// Don't warn about unknown types in copy constructors since we
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// don't know if they can be copied or not..
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if (!var->isPointer() &&
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!(var->type() && var->type()->needInitialization != Scope::True) &&
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(func->type == Function::eCopyConstructor || func->type == Function::eOperatorEqual)) {
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bool stdtype = false;
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for (const Token *type = var->typeStartToken(); type && type->isName(); type = type->next())
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stdtype |= type->isStandardType();
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if (!stdtype) {
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if (_settings->inconclusive)
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inconclusive = true;
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else
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continue;
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}
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}
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// It's non-static and it's not initialized => error
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if (func->type == Function::eOperatorEqual) {
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const Token *operStart = func->arg;
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bool classNameUsed = false;
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for (const Token *operTok = operStart; operTok != operStart->link(); operTok = operTok->next()) {
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if (operTok->str() == scope->className) {
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classNameUsed = true;
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break;
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}
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}
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if (classNameUsed)
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operatorEqVarError(func->token, scope->className, var->name(), inconclusive);
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} else if (func->access != Private) {
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const Scope *varType = var->type();
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if (!varType || varType->type != Scope::eUnion)
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uninitVarError(func->token, scope->className, var->name(), inconclusive);
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}
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}
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}
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}
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}
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void CheckClass::copyconstructors()
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{
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if (!_settings->isEnabled("style"))
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return;
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const std::size_t classes = symbolDatabase->classAndStructScopes.size();
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for (std::size_t i = 0; i < classes; ++i) {
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const Scope * scope = symbolDatabase->classAndStructScopes[i];
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std::map<unsigned int, const Token*> allocatedVars;
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for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
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if (func->type == Function::eConstructor && func->functionScope) {
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for (const Token* tok = func->functionScope->classStart; tok!=func->functionScope->classEnd; tok=tok->next()) {
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if (Token::Match(tok, "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc")) {
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const Variable* var = symbolDatabase->getVariableFromVarId(tok->varId());
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if (var && var->isPointer() && var->scope() == &*scope)
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allocatedVars[tok->varId()] = tok;
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}
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}
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}
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}
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std::set<const Token*> copiedVars;
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const Token* copyCtor = 0;
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for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
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if (func->type == Function::eCopyConstructor) {
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copyCtor = func->tokenDef;
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if (func->functionScope) {
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const Token* tok = func->tokenDef->linkAt(1)->next();
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if (tok->str()==":") {
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tok=tok->next();
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while (Token::Match(tok, "%var% (")) {
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if (allocatedVars.find(tok->varId()) != allocatedVars.end()) {
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if (tok->varId() && Token::Match(tok->tokAt(2), "%var% . %var% )"))
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copiedVars.insert(tok);
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else if (!Token::Match(tok->tokAt(2), "%any% )"))
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allocatedVars.erase(tok->varId()); // Assume memory is allocated
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}
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tok = tok->linkAt(1)->tokAt(2);
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}
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}
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for (tok=func->functionScope->classStart; tok!=func->functionScope->classEnd; tok=tok->next()) {
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if (Token::Match(tok, "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc")) {
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allocatedVars.erase(tok->varId());
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} else if (Token::Match(tok, "%var% = %var% . %var% ;") && allocatedVars.find(tok->varId()) != allocatedVars.end()) {
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copiedVars.insert(tok);
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}
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}
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} else // non-copyable or implementation not seen
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allocatedVars.clear();
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break;
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}
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}
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if (!copyCtor) {
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if (!allocatedVars.empty() && scope->derivedFrom.empty()) // TODO: Check if base class is non-copyable
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noCopyConstructorError(scope->classDef, scope->className, scope->type == Scope::eStruct);
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} else {
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if (!copiedVars.empty()) {
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for (std::set<const Token*>::const_iterator it = copiedVars.begin(); it != copiedVars.end(); ++it) {
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copyConstructorShallowCopyError(*it, (*it)->str());
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}
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}
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// throw error if count mismatch
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/* FIXME: This doesn't work. See #4154
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for (std::map<unsigned int, const Token*>::const_iterator i = allocatedVars.begin(); i != allocatedVars.end(); ++i) {
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copyConstructorMallocError(copyCtor, i->second, i->second->str());
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}
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*/
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}
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}
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}
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/* This doesn't work. See #4154
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void CheckClass::copyConstructorMallocError(const Token *cctor, const Token *alloc, const std::string& varname)
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{
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std::list<const Token*> callstack;
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callstack.push_back(cctor);
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callstack.push_back(alloc);
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reportError(callstack, Severity::warning, "copyCtorNoAllocation", "Copy constructor does not allocate memory for member '" + varname + "' although memory has been allocated in other constructors.");
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}
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*/
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void CheckClass::copyConstructorShallowCopyError(const Token *tok, const std::string& varname)
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{
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reportError(tok, Severity::style, "copyCtorPointerCopying", "Value of pointer '" + varname + "', which points to allocated memory, is copied in copy constructor instead of allocating new memory.");
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}
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void CheckClass::noCopyConstructorError(const Token *tok, const std::string &classname, bool isStruct)
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{
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// The constructor might be intentionally missing. Therefore this is not a "warning"
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reportError(tok, Severity::style, "noCopyConstructor",
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"'" + std::string(isStruct ? "struct" : "class") + " " + classname +
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"' does not have a copy constructor which is recommended since the class contains a pointer to allocated memory.");
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}
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bool CheckClass::canNotCopy(const Scope *scope)
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{
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std::list<Function>::const_iterator func;
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bool constructor = false;
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bool publicAssign = false;
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bool publicCopy = false;
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for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
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if (func->type == Function::eConstructor || func->type == Function::eCopyConstructor)
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constructor = true;
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if (func->type == Function::eCopyConstructor && func->access == Public)
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publicCopy = true;
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else if (func->type == Function::eOperatorEqual && func->access == Public)
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publicAssign = true;
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}
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return constructor && !(publicAssign || publicCopy);
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}
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void CheckClass::assignVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage)
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{
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count) {
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if (var->name() == varname) {
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usage[count].assign = true;
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return;
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}
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}
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}
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void CheckClass::initVar(const std::string &varname, const Scope *scope, std::vector<Usage> &usage)
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{
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std::list<Variable>::const_iterator var;
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unsigned int count = 0;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var, ++count) {
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if (var->name() == varname) {
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usage[count].init = true;
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return;
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}
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}
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}
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void CheckClass::assignAllVar(std::vector<Usage> &usage)
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{
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for (std::size_t i = 0; i < usage.size(); ++i)
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usage[i].assign = true;
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}
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void CheckClass::clearAllVar(std::vector<Usage> &usage)
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{
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for (std::size_t i = 0; i < usage.size(); ++i) {
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usage[i].assign = false;
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usage[i].init = false;
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}
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}
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bool CheckClass::isBaseClassFunc(const Token *tok, const Scope *scope)
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{
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// Iterate through each base class...
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for (std::size_t i = 0; i < scope->derivedFrom.size(); ++i) {
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const Scope *derivedFrom = scope->derivedFrom[i].scope;
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// Check if base class exists in database
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if (derivedFrom) {
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std::list<Function>::const_iterator func;
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for (func = derivedFrom->functionList.begin(); func != derivedFrom->functionList.end(); ++func) {
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if (func->tokenDef->str() == tok->str())
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return true;
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}
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}
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// Base class not found so assume it is in it.
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else
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return true;
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}
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return false;
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}
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void CheckClass::initializeVarList(const Function &func, std::list<const Function *> &callstack, const Scope *scope, std::vector<Usage> &usage)
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{
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bool initList = func.type == Function::eConstructor || func.type == Function::eCopyConstructor;
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const Token *ftok = func.arg->link()->next();
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int level = 0;
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for (; ftok != func.functionScope->classEnd; ftok = ftok->next()) {
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// Class constructor.. initializing variables like this
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// clKalle::clKalle() : var(value) { }
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if (initList) {
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if (level == 0 && Token::Match(ftok, "%var% (")) {
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if (ftok->str() != func.name()) {
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if (ftok->strAt(2) != ")")
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initVar(ftok->str(), scope, usage);
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} else { // c++11 delegate constructor
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const Function *member = symbolDatabase->findFunctionByNameAndArgsInScope(ftok, scope);
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// member function found
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if (member) {
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// recursive call
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// assume that all variables are initialized
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if (std::find(callstack.begin(), callstack.end(), member) != callstack.end()) {
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/** @todo false negative: just bail */
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assignAllVar(usage);
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return;
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}
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// member function has implementation
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if (member->hasBody) {
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// initialize variable use list using member function
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callstack.push_back(member);
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initializeVarList(*member, callstack, scope, usage);
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callstack.pop_back();
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}
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// there is a called member function, but it has no implementation, so we assume it initializes everything
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else {
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assignAllVar(usage);
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}
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}
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}
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} else if (level == 0 && Token::Match(ftok, "%var% {") && ftok->str() != "const" && Token::Match(ftok->next()->link()->next(), ",|{|%type%")) {
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initVar(ftok->str(), scope, usage);
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ftok = ftok->linkAt(1);
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} else if (level != 0 && Token::Match(ftok, "%var% =")) // assignment in the initializer: var(value = x)
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assignVar(ftok->str(), scope, usage);
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else if (ftok->str() == "(")
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level++;
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else if (ftok->str() == ")")
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level--;
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else if (ftok->str() == "{") {
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if (level == 0)
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initList = false;
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else
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ftok = ftok->link();
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}
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}
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if (initList)
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continue;
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// Variable getting value from stream?
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if (Token::Match(ftok, ">> %var%")) {
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assignVar(ftok->strAt(1), scope, usage);
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}
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// Before a new statement there is "[{};)=]"
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if (! Token::Match(ftok, "[{};()=]"))
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continue;
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if (Token::simpleMatch(ftok, "( !"))
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ftok = ftok->next();
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// Using the operator= function to initialize all variables..
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if (Token::Match(ftok->next(), "return| (| * this )| =")) {
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assignAllVar(usage);
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break;
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}
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// Using swap to assign all variables..
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if (func.type == Function::eOperatorEqual && Token::Match(ftok, "[;{}] %var% (") && Token::Match(ftok->linkAt(2), ") . %var% ( *| this ) ;")) {
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assignAllVar(usage);
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break;
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}
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// Calling member variable function?
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if (Token::Match(ftok->next(), "%var% . %var% (")) {
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std::list<Variable>::const_iterator var;
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for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var) {
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if (var->varId() == ftok->next()->varId()) {
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/** @todo false negative: we assume function changes variable state */
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assignVar(ftok->next()->str(), scope, usage);
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break;
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}
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}
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ftok = ftok->tokAt(2);
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}
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if (!Token::Match(ftok->next(), "::| %var%") &&
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!Token::Match(ftok->next(), "this . %var%") &&
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!Token::Match(ftok->next(), "* %var% =") &&
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!Token::Match(ftok->next(), "( * this ) . %var%"))
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continue;
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// Goto the first token in this statement..
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ftok = ftok->next();
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// skip "return"
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if (ftok->str() == "return")
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ftok = ftok->next();
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// Skip "( * this )"
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if (Token::simpleMatch(ftok, "( * this ) .")) {
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ftok = ftok->tokAt(5);
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}
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// Skip "this->"
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if (Token::simpleMatch(ftok, "this ."))
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ftok = ftok->tokAt(2);
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// Skip "classname :: "
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if (Token::Match(ftok, "%var% ::"))
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ftok = ftok->tokAt(2);
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// Clearing all variables..
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if (Token::Match(ftok, "::| memset ( this ,")) {
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assignAllVar(usage);
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return;
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}
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// Clearing array..
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else if (Token::Match(ftok, "::| memset ( %var% ,")) {
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if (ftok->str() == "::")
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ftok = ftok->next();
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assignVar(ftok->strAt(2), scope, usage);
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ftok = ftok->linkAt(1);
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continue;
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}
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// Calling member function?
|
|
else if (Token::simpleMatch(ftok, "operator= (") &&
|
|
ftok->previous()->str() != "::") {
|
|
const Function *member = symbolDatabase->findFunctionByNameAndArgsInScope(ftok, scope);
|
|
// member function found
|
|
if (member) {
|
|
// recursive call
|
|
// assume that all variables are initialized
|
|
if (std::find(callstack.begin(), callstack.end(), member) != callstack.end()) {
|
|
/** @todo false negative: just bail */
|
|
assignAllVar(usage);
|
|
return;
|
|
}
|
|
|
|
// member function has implementation
|
|
if (member->hasBody) {
|
|
// initialize variable use list using member function
|
|
callstack.push_back(member);
|
|
initializeVarList(*member, callstack, scope, usage);
|
|
callstack.pop_back();
|
|
}
|
|
|
|
// there is a called member function, but it has no implementation, so we assume it initializes everything
|
|
else {
|
|
assignAllVar(usage);
|
|
}
|
|
}
|
|
|
|
// using default operator =, assume everything initialized
|
|
else {
|
|
assignAllVar(usage);
|
|
}
|
|
} else if (Token::Match(ftok, "::| %var% (") && ftok->str() != "if") {
|
|
if (ftok->str() == "::")
|
|
ftok = ftok->next();
|
|
|
|
// Passing "this" => assume that everything is initialized
|
|
for (const Token *tok2 = ftok->next()->link(); tok2 && tok2 != ftok; tok2 = tok2->previous()) {
|
|
if (tok2->str() == "this") {
|
|
assignAllVar(usage);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// check if member function
|
|
const Function *member = symbolDatabase->findFunctionByNameAndArgsInScope(ftok, scope);
|
|
|
|
// member function found
|
|
if (member && member->type != Function::eConstructor) {
|
|
// recursive call
|
|
// assume that all variables are initialized
|
|
if (std::find(callstack.begin(), callstack.end(), member) != callstack.end()) {
|
|
assignAllVar(usage);
|
|
return;
|
|
}
|
|
|
|
// member function has implementation
|
|
if (member->hasBody) {
|
|
// initialize variable use list using member function
|
|
callstack.push_back(member);
|
|
initializeVarList(*member, callstack, scope, usage);
|
|
callstack.pop_back();
|
|
|
|
// Assume that variables that are passed to it are initialized..
|
|
for (const Token *tok2 = ftok; tok2; tok2 = tok2->next()) {
|
|
if (Token::Match(tok2, "[;{}]"))
|
|
break;
|
|
if (Token::Match(tok2, "[(,] &| %var% [,)]")) {
|
|
tok2 = tok2->next();
|
|
if (tok2->str() == "&")
|
|
tok2 = tok2->next();
|
|
assignVar(tok2->str(), scope, usage);
|
|
}
|
|
}
|
|
}
|
|
|
|
// there is a called member function, but it has no implementation, so we assume it initializes everything
|
|
else {
|
|
assignAllVar(usage);
|
|
}
|
|
}
|
|
|
|
// not member function
|
|
else {
|
|
// could be a base class virtual function, so we assume it initializes everything
|
|
if (func.type != Function::eConstructor && isBaseClassFunc(ftok, scope)) {
|
|
/** @todo False Negative: we should look at the base class functions to see if they
|
|
* call any derived class virtual functions that change the derived class state
|
|
*/
|
|
assignAllVar(usage);
|
|
}
|
|
|
|
// has friends, so we assume it initializes everything
|
|
if (!scope->friendList.empty())
|
|
assignAllVar(usage);
|
|
|
|
// the function is external and it's neither friend nor inherited virtual function.
|
|
// assume all variables that are passed to it are initialized..
|
|
else {
|
|
for (const Token *tok = ftok->tokAt(2); tok && tok != ftok->next()->link(); tok = tok->next()) {
|
|
if (tok->isName()) {
|
|
assignVar(tok->str(), scope, usage);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Assignment of member variable?
|
|
else if (Token::Match(ftok, "%var% =")) {
|
|
assignVar(ftok->str(), scope, usage);
|
|
}
|
|
|
|
// Assignment of array item of member variable?
|
|
else if (Token::Match(ftok, "%var% [|.")) {
|
|
const Token *tok2 = ftok;
|
|
while (tok2) {
|
|
if (Token::simpleMatch(tok2->next(), "["))
|
|
tok2 = tok2->next()->link();
|
|
else if (Token::Match(tok2->next(), ". %var%"))
|
|
tok2 = tok2->tokAt(2);
|
|
else
|
|
break;
|
|
}
|
|
if (tok2 && tok2->strAt(1) == "=")
|
|
assignVar(ftok->str(), scope, usage);
|
|
}
|
|
|
|
// Assignment of array item of member variable?
|
|
else if (Token::Match(ftok, "* %var% =")) {
|
|
assignVar(ftok->next()->str(), scope, usage);
|
|
}
|
|
|
|
// The functions 'clear' and 'Clear' are supposed to initialize variable.
|
|
if (Token::Match(ftok, "%var% . clear|Clear (")) {
|
|
assignVar(ftok->str(), scope, usage);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::noConstructorError(const Token *tok, const std::string &classname, bool isStruct)
|
|
{
|
|
// For performance reasons the constructor might be intentionally missing. Therefore this is not a "warning"
|
|
reportError(tok, Severity::style, "noConstructor",
|
|
"The " + std::string(isStruct ? "struct" : "class") + " '" + classname +
|
|
"' does not have a constructor.\n"
|
|
"The " + std::string(isStruct ? "struct" : "class") + " '" + classname +
|
|
"' does not have a constructor although it has private member variables. "
|
|
"Member variables of builtin types are left uninitialized when the class is "
|
|
"instanciated. That may cause bugs or undefined behavior.");
|
|
}
|
|
|
|
void CheckClass::uninitVarError(const Token *tok, const std::string &classname, const std::string &varname, bool inconclusive)
|
|
{
|
|
reportError(tok, Severity::warning, "uninitMemberVar", "Member variable '" + classname + "::" + varname + "' is not initialized in the constructor.", inconclusive);
|
|
}
|
|
|
|
void CheckClass::operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname, bool inconclusive)
|
|
{
|
|
reportError(tok, Severity::warning, "operatorEqVarError", "Member variable '" + classname + "::" + varname + "' is not assigned a value in '" + classname + "::operator='.", inconclusive);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: Use initialization list instead of assignment
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::initializationListUsage()
|
|
{
|
|
if (!_settings->isEnabled("performance"))
|
|
return;
|
|
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
|
|
// Check every constructor
|
|
if (!scope->function || (scope->function->type != Function::eConstructor && scope->function->type != Function::eCopyConstructor))
|
|
continue;
|
|
|
|
Scope* owner = scope->functionOf;
|
|
for (const Token* tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
|
|
if (Token::Match(tok, "%var% (")) // Assignments might depend on this function call or if/for/while/switch statement from now on.
|
|
break;
|
|
if (Token::Match(tok, "try|do {"))
|
|
break;
|
|
if (tok->varId() && Token::Match(tok, "%var% = %any%")) {
|
|
const Variable* var = symbolDatabase->getVariableFromVarId(tok->varId());
|
|
if (var && var->scope() == owner && !var->isStatic()) {
|
|
bool allowed = true;
|
|
for (const Token* tok2 = tok->tokAt(2); tok2->str() != ";"; tok2 = tok2->next()) {
|
|
if (tok2->varId()) {
|
|
const Variable* var2 = symbolDatabase->getVariableFromVarId(tok2->varId());
|
|
if (var2 && var2->scope() == owner) { // Is there a dependency between two member variables?
|
|
allowed = false;
|
|
break;
|
|
}
|
|
} else if (tok2->str() == "this") { // 'this' instance is not completely constructed in initialization list
|
|
allowed = false;
|
|
break;
|
|
} else if (Token::Match(tok2, "%var% (") && tok2->strAt(-1) != "." && isMemberFunc(owner, tok2)) { // Member function called?
|
|
allowed = false;
|
|
break;
|
|
}
|
|
}
|
|
if (!allowed)
|
|
continue;
|
|
if (!var->isPointer() && (var->type() || Token::Match(var->typeStartToken(), "std :: string|wstring !!::") || (Token::Match(var->typeStartToken(), "std :: %type% <") && !Token::simpleMatch(var->typeStartToken()->linkAt(3), "> ::")) || symbolDatabase->isClassOrStruct(var->typeStartToken()->str())))
|
|
suggestInitializationList(tok, tok->str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::suggestInitializationList(const Token* tok, const std::string& varname)
|
|
{
|
|
reportError(tok, Severity::performance, "useInitializationList", "Variable '" + varname + "' is assigned in constructor body. Consider performing initialization in initialization list.\n"
|
|
"When an object of a class is created, the constructors of all member variables are called consecutively "
|
|
"in the order the variables are declared, even if you don't explicitly write them to the initialization list. You "
|
|
"could avoid assigning '" + varname + "' a value by passing the value to the constructor in the initialization list.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: Unused private functions
|
|
//---------------------------------------------------------------------------
|
|
|
|
static bool checkFunctionUsage(const std::string& name, const Scope* scope)
|
|
{
|
|
if (!scope)
|
|
return true; // Assume its used, if scope is not seen
|
|
|
|
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
if (func->functionScope) {
|
|
for (const Token *ftok = func->functionScope->classStart; ftok != func->functionScope->classEnd; ftok = ftok->next()) {
|
|
if (ftok->str() == name && ftok->next()->str() == "(") // Function called. TODO: Handle overloads
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false; // Unused in this scope
|
|
}
|
|
|
|
void CheckClass::privateFunctions()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
|
|
// dont check borland classes with properties..
|
|
if (Token::findsimplematch(scope->classStart, "; __property ;", scope->classEnd))
|
|
continue;
|
|
|
|
// check that the whole class implementation is seen
|
|
bool whole = true;
|
|
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
if (!func->hasBody) {
|
|
// empty private copy constructors and assignment operators are OK
|
|
if ((func->type == Function::eCopyConstructor ||
|
|
func->type == Function::eOperatorEqual) &&
|
|
func->access == Private)
|
|
continue;
|
|
|
|
whole = false;
|
|
break;
|
|
}
|
|
}
|
|
if (!whole)
|
|
continue;
|
|
|
|
std::list<const Function*> FuncList;
|
|
/** @todo embedded class have access to private functions */
|
|
if (!scope->getNestedNonFunctions()) {
|
|
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
// Get private functions..
|
|
if (func->type == Function::eFunction && func->access == Private)
|
|
FuncList.push_back(&*func);
|
|
}
|
|
}
|
|
|
|
// Bailout for overriden virtual functions of base classes
|
|
if (!scope->derivedFrom.empty()) {
|
|
// Check virtual functions
|
|
for (std::list<const Function*>::iterator it = FuncList.begin(); it != FuncList.end();) {
|
|
if ((*it)->isImplicitlyVirtual(true)) // Give true as default value to be returned if we don't see all base classes
|
|
FuncList.erase(it++);
|
|
else
|
|
++it;
|
|
}
|
|
}
|
|
|
|
while (!FuncList.empty()) {
|
|
const std::string& funcName = FuncList.front()->tokenDef->str();
|
|
// Check that all private functions are used
|
|
bool used = checkFunctionUsage(funcName, &*scope); // Usage in this class
|
|
// Check in friend classes
|
|
for (std::list<Scope::FriendInfo>::const_iterator it = scope->friendList.begin(); !used && it != scope->friendList.end(); ++it)
|
|
used = checkFunctionUsage(funcName, it->scope);
|
|
|
|
if (!used) {
|
|
// Final check; check if the function pointer is used somewhere..
|
|
const std::string _pattern("return|throw|(|)|,|= &|" + funcName);
|
|
|
|
// or if the function address is used somewhere...
|
|
// eg. sigc::mem_fun(this, &className::classFunction)
|
|
const std::string _pattern2("& " + scope->className + " :: " + funcName);
|
|
const std::string methodAsArgument("(|, " + scope->className + " :: " + funcName + " ,|)");
|
|
const std::string methodAssigned("%var% = &| " + scope->className + " :: " + funcName);
|
|
|
|
if (!Token::findmatch(_tokenizer->tokens(), _pattern.c_str()) &&
|
|
!Token::findmatch(_tokenizer->tokens(), _pattern2.c_str()) &&
|
|
!Token::findmatch(_tokenizer->tokens(), methodAsArgument.c_str()) &&
|
|
!Token::findmatch(_tokenizer->tokens(), methodAssigned.c_str())) {
|
|
unusedPrivateFunctionError(FuncList.front()->tokenDef, scope->className, funcName);
|
|
}
|
|
}
|
|
|
|
FuncList.pop_front();
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::unusedPrivateFunctionError(const Token *tok, const std::string &classname, const std::string &funcname)
|
|
{
|
|
reportError(tok, Severity::style, "unusedPrivateFunction", "Unused private function: '" + classname + "::" + funcname + "'");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: Check that memset is not used on classes
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::noMemset()
|
|
{
|
|
const std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
|
|
if (!Token::Match(tok, "memset|memcpy|memmove ( %any%"))
|
|
continue;
|
|
|
|
const Token* arg1 = tok->tokAt(2);
|
|
const Token* arg3 = arg1;
|
|
arg3 = arg3->nextArgument();
|
|
if (arg3)
|
|
arg3 = arg3->nextArgument();
|
|
|
|
const Token *typeTok = 0;
|
|
if (Token::Match(arg3, "sizeof ( %type% ) )"))
|
|
typeTok = arg3->tokAt(2);
|
|
else if (Token::Match(arg3, "sizeof ( %type% :: %type% ) )"))
|
|
typeTok = arg3->tokAt(4);
|
|
else if (Token::Match(arg3, "sizeof ( struct %type% ) )"))
|
|
typeTok = arg3->tokAt(3);
|
|
else if (Token::Match(arg1, "&| %var% ,")) {
|
|
unsigned int varid = arg1->str() == "&" ? arg1->next()->varId() : arg1->varId();
|
|
const Variable *var = symbolDatabase->getVariableFromVarId(varid);
|
|
if (var && (var->typeStartToken() == var->typeEndToken() ||
|
|
Token::Match(var->typeStartToken(), "%type% :: %type%")))
|
|
typeTok = var->typeEndToken();
|
|
}
|
|
|
|
// No type defined => The tokens didn't match
|
|
if (!typeTok)
|
|
continue;
|
|
|
|
if (typeTok->str() == "(")
|
|
typeTok = typeTok->next();
|
|
|
|
const Scope *type = symbolDatabase->findVariableType(&(*scope), typeTok);
|
|
|
|
if (type)
|
|
checkMemsetType(&(*scope), tok, type);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::checkMemsetType(const Scope *start, const Token *tok, const Scope *type)
|
|
{
|
|
// recursively check all parent classes
|
|
for (std::size_t i = 0; i < type->derivedFrom.size(); i++) {
|
|
if (type->derivedFrom[i].scope)
|
|
checkMemsetType(start, tok, type->derivedFrom[i].scope);
|
|
}
|
|
|
|
// Warn if type is a class that contains any virtual functions
|
|
std::list<Function>::const_iterator func;
|
|
|
|
for (func = type->functionList.begin(); func != type->functionList.end(); ++func) {
|
|
if (func->isVirtual)
|
|
memsetError(tok, tok->str(), "virtual method", type->classDef->str());
|
|
}
|
|
|
|
// Warn if type is a class or struct that contains any std::* variables
|
|
std::list<Variable>::const_iterator var;
|
|
|
|
for (var = type->varlist.begin(); var != type->varlist.end(); ++var) {
|
|
// don't warn if variable static or const, pointer or reference
|
|
if (!var->isStatic() && !var->isConst() && !var->isPointer() && !var->isReference()) {
|
|
const Token *tok1 = var->typeStartToken();
|
|
|
|
// check for std:: type
|
|
if (Token::simpleMatch(tok1, "std ::"))
|
|
memsetError(tok, tok->str(), "'std::" + tok1->strAt(2) + "'", type->classDef->str());
|
|
|
|
// check for known type
|
|
else if (var->type())
|
|
checkMemsetType(start, tok, var->type());
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::memsetError(const Token *tok, const std::string &memfunc, const std::string &classname, const std::string &type)
|
|
{
|
|
reportError(tok, Severity::error, "memsetClass", "Using '" + memfunc + "' on " + type + " that contains a " + classname + ".");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "void operator=(" and "const type & operator=("
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::operatorEq()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
std::list<Function>::const_iterator func;
|
|
|
|
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
if (func->type == Function::eOperatorEqual && func->access != Private) {
|
|
// use definition for check so we don't have to deal with qualification
|
|
if (!(Token::Match(func->tokenDef->tokAt(-3), ";|}|{|public:|protected:|private:|virtual %type% &") &&
|
|
func->tokenDef->strAt(-2) == scope->className)) {
|
|
// make sure we really have a copy assignment operator
|
|
if (Token::Match(func->tokenDef->tokAt(2), "const| %var% &")) {
|
|
if (func->tokenDef->strAt(2) == "const" &&
|
|
func->tokenDef->strAt(3) == scope->className)
|
|
operatorEqReturnError(func->tokenDef->previous(), scope->className);
|
|
else if (func->tokenDef->strAt(2) == scope->className)
|
|
operatorEqReturnError(func->tokenDef->previous(), scope->className);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::operatorEqReturnError(const Token *tok, const std::string &className)
|
|
{
|
|
reportError(tok, Severity::style, "operatorEq", "'" + className + "::operator=' should return '" + className + " &'.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "C& operator=(const C&) { ... return *this; }"
|
|
// operator= should return a reference to *this
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::operatorEqRetRefThis()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
std::list<Function>::const_iterator func;
|
|
|
|
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
if (func->type == Function::eOperatorEqual && func->hasBody) {
|
|
// make sure return signature is correct
|
|
if (Token::Match(func->tokenDef->tokAt(-3), ";|}|{|public:|protected:|private:|virtual %type% &") &&
|
|
func->tokenDef->strAt(-2) == scope->className) {
|
|
|
|
checkReturnPtrThis(&(*scope), &(*func), func->functionScope->classStart, func->functionScope->classEnd);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::checkReturnPtrThis(const Scope *scope, const Function *func, const Token *tok, const Token *last)
|
|
{
|
|
bool foundReturn = false;
|
|
|
|
for (; tok && tok != last; tok = tok->next()) {
|
|
// check for return of reference to this
|
|
if (tok->str() == "return") {
|
|
foundReturn = true;
|
|
std::string cast("( " + scope->className + " & )");
|
|
if (Token::simpleMatch(tok->next(), cast.c_str()))
|
|
tok = tok->tokAt(4);
|
|
|
|
// check if a function is called
|
|
if (tok->strAt(2) == "(" &&
|
|
tok->linkAt(2)->next()->str() == ";") {
|
|
std::list<Function>::const_iterator it;
|
|
|
|
// check if it is a member function
|
|
for (it = scope->functionList.begin(); it != scope->functionList.end(); ++it) {
|
|
// check for a regular function with the same name and a body
|
|
if (it->type == Function::eFunction && it->hasBody &&
|
|
it->token->str() == tok->next()->str()) {
|
|
// check for the proper return type
|
|
if (it->tokenDef->previous()->str() == "&" &&
|
|
it->tokenDef->strAt(-2) == scope->className) {
|
|
// make sure it's not a const function
|
|
if (!it->isConst) {
|
|
/** @todo make sure argument types match */
|
|
// make sure it's not the same function
|
|
if (&*it != func)
|
|
checkReturnPtrThis(scope, &*it, it->arg->link()->next(), it->arg->link()->next()->link());
|
|
|
|
// just bail for now
|
|
else
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// check if *this is returned
|
|
else if (!(Token::Match(tok->next(), "(| * this ;|=") ||
|
|
Token::simpleMatch(tok->next(), "operator= (") ||
|
|
Token::simpleMatch(tok->next(), "this . operator= (") ||
|
|
(Token::Match(tok->next(), "%type% :: operator= (") &&
|
|
tok->next()->str() == scope->className)))
|
|
operatorEqRetRefThisError(func->token);
|
|
}
|
|
}
|
|
if (!foundReturn)
|
|
operatorEqRetRefThisError(func->token);
|
|
}
|
|
|
|
void CheckClass::operatorEqRetRefThisError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::style, "operatorEqRetRefThis", "'operator=' should return reference to 'this' instance.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: "C& operator=(const C& rhs) { if (this == &rhs) ... }"
|
|
// operator= should check for assignment to self
|
|
//
|
|
// For simple classes, an assignment to self check is only a potential optimization.
|
|
//
|
|
// For classes that allocate dynamic memory, assignment to self can be a real error
|
|
// if it is deallocated and allocated again without being checked for.
|
|
//
|
|
// This check is not valid for classes with multiple inheritance because a
|
|
// class can have multiple addresses so there is no trivial way to check for
|
|
// assignment to self.
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::operatorEqToSelf()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
std::list<Function>::const_iterator func;
|
|
|
|
// skip classes with multiple inheritance
|
|
if (scope->derivedFrom.size() > 1)
|
|
continue;
|
|
|
|
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
if (func->type == Function::eOperatorEqual && func->hasBody) {
|
|
// make sure that the operator takes an object of the same type as *this, otherwise we can't detect self-assignment checks
|
|
if (func->argumentList.empty())
|
|
continue;
|
|
const Token* typeTok = func->argumentList.front().typeEndToken();
|
|
while (typeTok->str() == "const" || typeTok->str() == "&" || typeTok->str() == "*")
|
|
typeTok = typeTok->previous();
|
|
if (typeTok->str() != scope->className)
|
|
continue;
|
|
|
|
// make sure return signature is correct
|
|
if (Token::Match(func->tokenDef->tokAt(-3), ";|}|{|public:|protected:|private: %type% &") &&
|
|
func->tokenDef->strAt(-2) == scope->className) {
|
|
// find the parameter name
|
|
const Token *rhs = func->argumentList.begin()->nameToken();
|
|
|
|
if (!hasAssignSelf(&(*func), rhs)) {
|
|
if (hasAllocation(&(*func), &*scope))
|
|
operatorEqToSelfError(func->token);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool CheckClass::hasAllocation(const Function *func, const Scope* scope)
|
|
{
|
|
// This function is called when no simple check was found for assignment
|
|
// to self. We are currently looking for:
|
|
// - deallocate member ; ... member =
|
|
// - alloc member
|
|
// That is not ideal because it can cause false negatives but its currently
|
|
// necessary to prevent false positives.
|
|
const Token *last = func->functionScope->classEnd;
|
|
for (const Token *tok = func->functionScope->classStart; tok && (tok != last); tok = tok->next()) {
|
|
if (Token::Match(tok, "%var% = malloc|realloc|calloc|new") && isMemberVar(scope, tok))
|
|
return true;
|
|
|
|
// check for deallocating memory
|
|
const Token *var = 0;
|
|
if (Token::Match(tok, "free ( %var%"))
|
|
var = tok->tokAt(2);
|
|
else if (Token::Match(tok, "delete [ ] %var%"))
|
|
var = tok->tokAt(3);
|
|
else if (Token::Match(tok, "delete %var%"))
|
|
var = tok->next();
|
|
// Check for assignement to the deleted pointer (only if its a member of the class)
|
|
if (var && isMemberVar(scope, var)) {
|
|
for (const Token *tok1 = var->next(); tok1 && (tok1 != last); tok1 = tok1->next()) {
|
|
if (Token::Match(tok1, "%var% =")) {
|
|
if (tok1->str() == var->str())
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool CheckClass::hasAssignSelf(const Function *func, const Token *rhs)
|
|
{
|
|
const Token *last = func->functionScope->classEnd;
|
|
for (const Token *tok = func->functionScope->classStart; tok && tok != last; tok = tok->next()) {
|
|
if (Token::simpleMatch(tok, "if (")) {
|
|
const Token *tok1 = tok->tokAt(2);
|
|
const Token *tok2 = tok->next()->link();
|
|
|
|
if (tok1 && tok2) {
|
|
for (; tok1 && tok1 != tok2; tok1 = tok1->next()) {
|
|
if (Token::Match(tok1, "this ==|!= & %var%")) {
|
|
if (tok1->strAt(3) == rhs->str())
|
|
return true;
|
|
} else if (Token::Match(tok1, "& %var% ==|!= this")) {
|
|
if (tok1->strAt(1) == rhs->str())
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void CheckClass::operatorEqToSelfError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning, "operatorEqToSelf",
|
|
"'operator=' should check for assignment to self to avoid problems with dynamic memory.\n"
|
|
"'operator=' should check for assignment to self to ensure that each block of dynamically "
|
|
"allocated memory is owned and managed by only one instance of the class.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// A destructor in a base class should be virtual
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::virtualDestructor()
|
|
{
|
|
// This error should only be given if:
|
|
// * base class doesn't have virtual destructor
|
|
// * derived class has non-empty destructor
|
|
// * base class is deleted
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
|
|
// Skip base classes
|
|
if (scope->derivedFrom.empty())
|
|
continue;
|
|
|
|
// Find the destructor
|
|
const Function *destructor = scope->getDestructor();
|
|
|
|
// Check for destructor with implementation
|
|
if (!destructor || !destructor->hasBody)
|
|
continue;
|
|
|
|
// Empty destructor
|
|
if (destructor->token->linkAt(3) == destructor->token->tokAt(4))
|
|
continue;
|
|
|
|
const Token *derived = scope->classDef;
|
|
const Token *derivedClass = derived->next();
|
|
|
|
// Iterate through each base class...
|
|
for (unsigned int j = 0; j < scope->derivedFrom.size(); ++j) {
|
|
// Check if base class is public and exists in database
|
|
if (scope->derivedFrom[j].access != Private && scope->derivedFrom[j].scope) {
|
|
const Scope *derivedFrom = scope->derivedFrom[j].scope;
|
|
|
|
// Name of base class..
|
|
const std::string& baseName = derivedFrom->className;
|
|
|
|
// Check for this pattern:
|
|
// 1. Base class pointer is given the address of derived class instance
|
|
// 2. Base class pointer is deleted
|
|
//
|
|
// If this pattern is not seen then bailout the checking of these base/derived classes
|
|
{
|
|
// pointer variables of type 'Base *'
|
|
std::set<unsigned int> basepointer;
|
|
|
|
// pointer variables of type 'Base *' that should not be deleted
|
|
std::set<unsigned int> dontDelete;
|
|
|
|
// No deletion of derived class instance through base class pointer found => the code is ok
|
|
bool ok = true;
|
|
|
|
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
|
|
// Declaring base class pointer
|
|
if (Token::simpleMatch(tok, baseName.c_str())) {
|
|
if (Token::Match(tok->previous(), ("[;{}] " + baseName + " * %var% ;").c_str()))
|
|
basepointer.insert(tok->tokAt(2)->varId());
|
|
}
|
|
|
|
// Assign base class pointer with pointer to derived class instance
|
|
else if (Token::Match(tok, "[;{}] %var% =") &&
|
|
tok->next()->varId() > 0 &&
|
|
basepointer.find(tok->next()->varId()) != basepointer.end()) {
|
|
// new derived class..
|
|
if (Token::simpleMatch(tok->tokAt(3), ("new " + derivedClass->str()).c_str())) {
|
|
dontDelete.insert(tok->next()->varId());
|
|
}
|
|
}
|
|
|
|
// Delete base class pointer that might point at derived class
|
|
else if (Token::Match(tok, "delete %var% ;") &&
|
|
tok->next()->varId() &&
|
|
dontDelete.find(tok->next()->varId()) != dontDelete.end()) {
|
|
ok = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// No base class pointer that points at a derived class is deleted
|
|
if (ok)
|
|
continue;
|
|
}
|
|
|
|
// Find the destructor declaration for the base class.
|
|
const Function *base_destructor = derivedFrom->getDestructor();
|
|
const Token *base = 0;
|
|
if (base_destructor)
|
|
base = base_destructor->token;
|
|
|
|
// Check that there is a destructor..
|
|
if (!base_destructor) {
|
|
if (derivedFrom->derivedFrom.empty())
|
|
virtualDestructorError(derivedFrom->classDef, baseName, derivedClass->str());
|
|
} else if (!base_destructor->isVirtual) {
|
|
// TODO: This is just a temporary fix, better solution is needed.
|
|
// Skip situations where base class has base classes of its own, because
|
|
// some of the base classes might have virtual destructor.
|
|
// Proper solution is to check all of the base classes. If base class is not
|
|
// found or if one of the base classes has virtual destructor, error should not
|
|
// be printed. See TODO test case "virtualDestructorInherited"
|
|
if (derivedFrom->derivedFrom.empty()) {
|
|
// Make sure that the destructor is public (protected or private
|
|
// would not compile if inheritance is used in a way that would
|
|
// cause the bug we are trying to find here.)
|
|
if (base_destructor->access == Public)
|
|
virtualDestructorError(base, baseName, derivedClass->str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::virtualDestructorError(const Token *tok, const std::string &Base, const std::string &Derived)
|
|
{
|
|
reportError(tok, Severity::error, "virtualDestructor", "Class '" + Base + "' which is inherited by class '" + Derived + "' does not have a virtual destructor.\n"
|
|
"Class '" + Base + "' which is inherited by class '" + Derived + "' does not have a virtual destructor. "
|
|
"If you destroy instances of the derived class by deleting a pointer that points to the base class, only "
|
|
"the destructor of the base class is executed. Thus, dynamic memory that is managed by the derived class "
|
|
"could leak. This can be avoided by adding a virtual destructor to the base class.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// warn for "this-x". The indented code may be "this->x"
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::thisSubtraction()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const Token *tok = _tokenizer->tokens();
|
|
for (;;) {
|
|
tok = Token::findmatch(tok, "this - %var%");
|
|
if (!tok)
|
|
break;
|
|
|
|
if (tok->strAt(-1) != "*")
|
|
thisSubtractionError(tok);
|
|
|
|
tok = tok->next();
|
|
}
|
|
}
|
|
|
|
void CheckClass::thisSubtractionError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::warning, "thisSubtraction", "Suspicious pointer subtraction. Did you intend to write '->'?");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// can member function be const?
|
|
//---------------------------------------------------------------------------
|
|
|
|
void CheckClass::checkConst()
|
|
{
|
|
// This is an inconclusive check. False positives: #3322.
|
|
if (!_settings->inconclusive)
|
|
return;
|
|
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * scope = symbolDatabase->classAndStructScopes[i];
|
|
std::list<Function>::const_iterator func;
|
|
|
|
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
// does the function have a body?
|
|
if (func->type == Function::eFunction && func->hasBody && !func->isFriend && !func->isStatic && !func->isVirtual) {
|
|
// get last token of return type
|
|
const Token *previous = func->tokenDef->previous();
|
|
|
|
// does the function return a pointer or reference?
|
|
if (Token::Match(previous, "*|&")) {
|
|
const Token *temp = previous;
|
|
|
|
while (!Token::Match(temp->previous(), ";|}|{|public:|protected:|private:"))
|
|
temp = temp->previous();
|
|
|
|
if (temp->str() != "const")
|
|
continue;
|
|
} else if (Token::Match(previous->previous(), "*|& >")) {
|
|
const Token *temp = previous;
|
|
|
|
while (!Token::Match(temp->previous(), ";|}|{|public:|protected:|private:")) {
|
|
temp = temp->previous();
|
|
if (temp->str() == "const")
|
|
break;
|
|
}
|
|
|
|
if (temp->str() != "const")
|
|
continue;
|
|
} else if (func->isOperator && Token::Match(previous, ";|{|}|public:|private:|protected:")) { // Operator without return type: conversion operator
|
|
const std::string& opName = func->tokenDef->str();
|
|
if (opName.compare(8, 5, "const") != 0 && opName[opName.size()-1] == '&')
|
|
continue;
|
|
} else {
|
|
// don't warn for unknown types..
|
|
// LPVOID, HDC, etc
|
|
if (previous->isUpperCaseName() && previous->str().size() > 2 && !symbolDatabase->isClassOrStruct(previous->str()))
|
|
continue;
|
|
}
|
|
|
|
// check if base class function is virtual
|
|
if (!scope->derivedFrom.empty()) {
|
|
if (func->isImplicitlyVirtual(true))
|
|
continue;
|
|
}
|
|
|
|
bool memberAccessed = false;
|
|
// if nothing non-const was found. write error..
|
|
if (checkConstFunc(&(*scope), &*func, memberAccessed)) {
|
|
std::string classname = scope->className;
|
|
const Scope *nest = scope->nestedIn;
|
|
while (nest && nest->type != Scope::eGlobal) {
|
|
classname = std::string(nest->className + "::" + classname);
|
|
nest = nest->nestedIn;
|
|
}
|
|
|
|
// get function name
|
|
std::string functionName = (func->tokenDef->isName() ? "" : "operator") + func->tokenDef->str();
|
|
|
|
if (func->tokenDef->str() == "(")
|
|
functionName += ")";
|
|
else if (func->tokenDef->str() == "[")
|
|
functionName += "]";
|
|
|
|
if (!func->isConst || (!memberAccessed && !func->isOperator)) {
|
|
if (func->isInline)
|
|
checkConstError(func->token, classname, functionName, !memberAccessed && !func->isOperator);
|
|
else // not inline
|
|
checkConstError2(func->token, func->tokenDef, classname, functionName, !memberAccessed && !func->isOperator);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
bool CheckClass::isMemberVar(const Scope *scope, const Token *tok)
|
|
{
|
|
bool again = false;
|
|
|
|
// try to find the member variable
|
|
do {
|
|
again = false;
|
|
|
|
if (tok->str() == "this") {
|
|
return true;
|
|
} else if (Token::simpleMatch(tok->tokAt(-3), "( * this )")) {
|
|
return true;
|
|
} else if (Token::Match(tok->tokAt(-2), "%var% . %var%")) {
|
|
tok = tok->tokAt(-2);
|
|
again = true;
|
|
} else if (Token::Match(tok->tokAt(-2), "] . %var%")) {
|
|
tok = tok->linkAt(-2)->previous();
|
|
again = true;
|
|
} else if (tok->str() == "]") {
|
|
tok = tok->link()->previous();
|
|
again = true;
|
|
}
|
|
} while (again);
|
|
|
|
std::list<Variable>::const_iterator var;
|
|
for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var) {
|
|
if (var->name() == tok->str()) {
|
|
if (tok->varId() == 0)
|
|
symbolDatabase->debugMessage(tok, "CheckClass::isMemberVar found used member variable \'" + tok->str() + "\' with varid 0");
|
|
|
|
return !var->isStatic();
|
|
}
|
|
}
|
|
|
|
// not found in this class
|
|
if (!scope->derivedFrom.empty()) {
|
|
// check each base class
|
|
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i) {
|
|
// find the base class
|
|
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
|
|
|
// find the function in the base class
|
|
if (derivedFrom) {
|
|
if (isMemberVar(derivedFrom, tok))
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static unsigned int countParameters(const Token *tok)
|
|
{
|
|
tok = tok->tokAt(2);
|
|
if (tok->str() == ")")
|
|
return 0;
|
|
|
|
unsigned int numpar = 1;
|
|
while (NULL != (tok = tok->nextArgument()))
|
|
numpar++;
|
|
|
|
return numpar;
|
|
}
|
|
|
|
static unsigned int countMinArgs(const Token* argList)
|
|
{
|
|
if (!argList)
|
|
return 0;
|
|
|
|
argList = argList->next();
|
|
if (argList->str() == ")")
|
|
return 0;
|
|
|
|
unsigned int count = 1;
|
|
for (; argList; argList = argList->next()) {
|
|
if (argList->link() && Token::Match(argList, "(|[|{|<"))
|
|
argList = argList->link();
|
|
else if (argList->str() == ",")
|
|
count++;
|
|
else if (argList->str() == "=")
|
|
return count-1;
|
|
else if (argList->str() == ")")
|
|
break;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
bool CheckClass::isMemberFunc(const Scope *scope, const Token *tok)
|
|
{
|
|
unsigned int args = countParameters(tok);
|
|
|
|
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
/** @todo we need to look at the argument types when there are overloaded functions
|
|
* with the same number of arguments */
|
|
if (func->tokenDef->str() == tok->str() && (func->argCount() == args || (func->argCount() > args && countMinArgs(func->argDef) <= args))) {
|
|
return !func->isStatic;
|
|
}
|
|
}
|
|
|
|
// not found in this class
|
|
if (!scope->derivedFrom.empty()) {
|
|
// check each base class
|
|
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i) {
|
|
// find the base class
|
|
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
|
|
|
// find the function in the base class
|
|
if (derivedFrom) {
|
|
if (isMemberFunc(derivedFrom, tok))
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool CheckClass::isConstMemberFunc(const Scope *scope, const Token *tok)
|
|
{
|
|
unsigned int args = countParameters(tok);
|
|
|
|
std::list<Function>::const_iterator func;
|
|
unsigned int matches = 0;
|
|
unsigned int consts = 0;
|
|
|
|
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
|
|
/** @todo we need to look at the argument types when there are overloaded functions
|
|
* with the same number of arguments */
|
|
if (func->tokenDef->str() == tok->str() && (func->argCount() == args || (func->argCount() > args && countMinArgs(func->argDef) <= args))) {
|
|
matches++;
|
|
if (func->isConst)
|
|
consts++;
|
|
}
|
|
}
|
|
|
|
// if there are multiple matches that are all const, return const
|
|
if (matches > 0 && matches == consts)
|
|
return true;
|
|
|
|
// not found in this class
|
|
if (!scope->derivedFrom.empty()) {
|
|
// check each base class
|
|
for (unsigned int i = 0; i < scope->derivedFrom.size(); ++i) {
|
|
// find the base class
|
|
const Scope *derivedFrom = scope->derivedFrom[i].scope;
|
|
|
|
// find the function in the base class
|
|
if (derivedFrom) {
|
|
if (isConstMemberFunc(derivedFrom, tok))
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool CheckClass::checkConstFunc(const Scope *scope, const Function *func, bool& memberAccessed)
|
|
{
|
|
// if the function doesn't have any assignment nor function call,
|
|
// it can be a const function..
|
|
for (const Token *tok1 = func->functionScope->classStart; tok1 && tok1 != func->functionScope->classEnd; tok1 = tok1->next()) {
|
|
if (tok1->isName() && isMemberVar(scope, tok1)) {
|
|
memberAccessed = true;
|
|
const Variable* v = symbolDatabase->getVariableFromVarId(tok1->varId());
|
|
if (v && v->isMutable())
|
|
continue;
|
|
|
|
if (tok1->str() == "this" && tok1->previous()->isAssignmentOp())
|
|
return(false);
|
|
|
|
unsigned int lastVarId = tok1->varId();
|
|
const Token* end = tok1;
|
|
for (;;) {
|
|
if (Token::Match(end->next(), ". %var%")) {
|
|
end = end->tokAt(2);
|
|
if (end->varId())
|
|
lastVarId = end->varId();
|
|
} else if (end->strAt(1) == "[") {
|
|
if (end->varId()) {
|
|
const Variable *var = symbolDatabase->getVariableFromVarId(end->varId());
|
|
|
|
if (var && Token::simpleMatch(var->typeStartToken(), "std :: map")) // operator[] changes a map
|
|
return(false);
|
|
}
|
|
end = end->linkAt(1);
|
|
} else if (end->strAt(1) == ")")
|
|
end = end->next();
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (end->strAt(1) == "(") {
|
|
const Variable *var = symbolDatabase->getVariableFromVarId(lastVarId);
|
|
if (!var)
|
|
return(false);
|
|
if (Token::simpleMatch(var->typeStartToken(), "std ::") // assume all std::*::size() and std::*::empty() are const
|
|
&& (Token::Match(end, "size|empty|cend|crend|cbegin|crbegin|max_size|length|count|capacity|get_allocator|c_str|str ( )") || Token::Match(end, "rfind|copy")))
|
|
;
|
|
else if (!var->type() || !isConstMemberFunc(var->type(), end))
|
|
return(false);
|
|
}
|
|
|
|
// Assignment
|
|
else if (end->next()->type() == Token::eAssignmentOp)
|
|
return(false);
|
|
|
|
// Streaming
|
|
else if (end->strAt(1) == "<<" && tok1->strAt(-1) != "<<")
|
|
return(false);
|
|
else if (tok1->strAt(-1) == ">>")
|
|
return(false);
|
|
|
|
// ++/--
|
|
else if (end->next()->type() == Token::eIncDecOp || tok1->previous()->type() == Token::eIncDecOp)
|
|
return(false);
|
|
|
|
|
|
const Token* start = tok1;
|
|
while (tok1->strAt(-1) == ")")
|
|
tok1 = tok1->linkAt(-1);
|
|
|
|
if (start->strAt(-1) == "delete")
|
|
return(false);
|
|
|
|
tok1 = end;
|
|
}
|
|
|
|
// streaming: <<
|
|
else if (Token::simpleMatch(tok1->previous(), ") <<") &&
|
|
isMemberVar(scope, tok1->tokAt(-2))) {
|
|
const Variable* var = symbolDatabase->getVariableFromVarId(tok1->tokAt(-2)->varId());
|
|
if (!var || !var->isMutable())
|
|
return(false);
|
|
}
|
|
|
|
|
|
// function call..
|
|
else if (Token::Match(tok1, "%var% (") && !tok1->isStandardType() &&
|
|
!Token::Match(tok1, "return|if|string|switch|while|catch|for")) {
|
|
if (isMemberFunc(scope, tok1) && tok1->strAt(-1) != ".") {
|
|
if (!isConstMemberFunc(scope, tok1))
|
|
return(false);
|
|
memberAccessed = true;
|
|
}
|
|
// Member variable given as parameter
|
|
for (const Token* tok2 = tok1->tokAt(2); tok2 && tok2 != tok1->next()->link(); tok2 = tok2->next()) {
|
|
if (tok2->str() == "(")
|
|
tok2 = tok2->link();
|
|
else if (tok2->isName() && isMemberVar(scope, tok2)) {
|
|
const Variable* var = symbolDatabase->getVariableFromVarId(tok2->varId());
|
|
if (!var || !var->isMutable())
|
|
return(false); // TODO: Only bailout if function takes argument as non-const reference
|
|
}
|
|
}
|
|
} else if (Token::simpleMatch(tok1, "> (") && (!tok1->link() || !Token::Match(tok1->link()->previous(), "static_cast|const_cast|dynamic_cast|reinterpret_cast"))) {
|
|
return(false);
|
|
}
|
|
}
|
|
|
|
return(true);
|
|
}
|
|
|
|
void CheckClass::checkConstError(const Token *tok, const std::string &classname, const std::string &funcname, bool suggestStatic)
|
|
{
|
|
checkConstError2(tok, 0, classname, funcname, suggestStatic);
|
|
}
|
|
|
|
void CheckClass::checkConstError2(const Token *tok1, const Token *tok2, const std::string &classname, const std::string &funcname, bool suggestStatic)
|
|
{
|
|
std::list<const Token *> toks;
|
|
toks.push_back(tok1);
|
|
if (tok2)
|
|
toks.push_back(tok2);
|
|
if (!suggestStatic)
|
|
reportError(toks, Severity::style, "functionConst",
|
|
"Technically the member function '" + classname + "::" + funcname + "' can be const.\n"
|
|
"The member function '" + classname + "::" + funcname + "' can be made a const "
|
|
"function. Making this function 'const' should not cause compiler errors. "
|
|
"Even though the function can be made const function technically it may not make "
|
|
"sense conceptually. Think about your design and the task of the function first - is "
|
|
"it a function that must not change object internal state?", true);
|
|
else
|
|
reportError(toks, Severity::performance, "functionStatic",
|
|
"Technically the member function '" + classname + "::" + funcname + "' can be static.\n"
|
|
"The member function '" + classname + "::" + funcname + "' can be made a static "
|
|
"function. Making a function static can bring a performance benefit since no 'this' instance is "
|
|
"passed to the function. This change should not cause compiler errors but it does not "
|
|
"necessarily make sense conceptually. Think about your design and the task of the function first - "
|
|
"is it a function that must not access members of class instances?", true);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// ClassCheck: Check that initializer list is in declared order.
|
|
//---------------------------------------------------------------------------
|
|
|
|
struct VarInfo {
|
|
VarInfo(const Variable *_var, const Token *_tok)
|
|
: var(_var), tok(_tok) { }
|
|
|
|
const Variable *var;
|
|
const Token *tok;
|
|
};
|
|
|
|
void CheckClass::initializerListOrder()
|
|
{
|
|
if (!_settings->isEnabled("style"))
|
|
return;
|
|
|
|
// This check is not inconclusive. However it only determines if the initialization
|
|
// order is incorrect. It does not determine if being out of order causes
|
|
// a real error. Out of order is not necessarily an error but you can never
|
|
// have an error if the list is in order so this enforces defensive programming.
|
|
if (!_settings->inconclusive)
|
|
return;
|
|
|
|
const std::size_t classes = symbolDatabase->classAndStructScopes.size();
|
|
for (std::size_t i = 0; i < classes; ++i) {
|
|
const Scope * info = symbolDatabase->classAndStructScopes[i];
|
|
std::list<Function>::const_iterator func;
|
|
|
|
// iterate through all member functions looking for constructors
|
|
for (func = info->functionList.begin(); func != info->functionList.end(); ++func) {
|
|
if ((func->type == Function::eConstructor || func->type == Function::eCopyConstructor) && func->hasBody) {
|
|
// check for initializer list
|
|
const Token *tok = func->arg->link()->next();
|
|
|
|
if (tok->str() == ":") {
|
|
std::vector<VarInfo> vars;
|
|
tok = tok->next();
|
|
|
|
// find all variable initializations in list
|
|
while (tok && tok->str() != "{") {
|
|
if (Token::Match(tok, "%var% (")) {
|
|
const Variable *var = info->getVariable(tok->str());
|
|
|
|
if (var)
|
|
vars.push_back(VarInfo(var, tok));
|
|
|
|
if (Token::Match(tok->tokAt(2), "%var% =")) {
|
|
var = info->getVariable(tok->strAt(2));
|
|
|
|
if (var)
|
|
vars.push_back(VarInfo(var, tok->tokAt(2)));
|
|
}
|
|
tok = tok->next()->link()->next();
|
|
} else
|
|
tok = tok->next();
|
|
}
|
|
|
|
// need at least 2 members to have out of order initialization
|
|
for (std::size_t j = 1; j < vars.size(); j++) {
|
|
// check for out of order initialization
|
|
if (vars[j].var->index() < vars[j - 1].var->index())
|
|
initializerListError(vars[j].tok,vars[j].var->nameToken(), info->className, vars[j].var->name());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckClass::initializerListError(const Token *tok1, const Token *tok2, const std::string &classname, const std::string &varname)
|
|
{
|
|
std::list<const Token *> toks;
|
|
toks.push_back(tok1);
|
|
toks.push_back(tok2);
|
|
reportError(toks, Severity::style, "initializerList",
|
|
"Member variable '" + classname + "::" +
|
|
varname + "' is in the wrong place in the initializer list.\n"
|
|
"Member variable '" + classname + "::" +
|
|
varname + "' is in the wrong place in the initializer list. "
|
|
"Members are initialized in the order they are declared, not in the "
|
|
"order they are in the initializer list. Keeping the initializer list "
|
|
"in the same order that the members were declared prevents order dependent "
|
|
"initialization errors.", true);
|
|
}
|