313 lines
12 KiB
C++
313 lines
12 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2017 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 "checkexceptionsafety.h"
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#include "settings.h"
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#include "symboldatabase.h"
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#include <cstddef>
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#include <set>
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#include <utility>
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//---------------------------------------------------------------------------
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// Register CheckExceptionSafety..
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namespace {
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CheckExceptionSafety instance;
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}
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//---------------------------------------------------------------------------
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void CheckExceptionSafety::destructors()
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{
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if (!_settings->isEnabled(Settings::WARNING))
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return;
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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// Perform check..
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const std::size_t functions = symbolDatabase->functionScopes.size();
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for (std::size_t i = 0; i < functions; ++i) {
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const Scope * scope = symbolDatabase->functionScopes[i];
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const Function * function = scope->function;
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if (function) {
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// only looking for destructors
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if (function->type == Function::eDestructor) {
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// Inspect this destructor.
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for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
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// Skip try blocks
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if (Token::simpleMatch(tok, "try {")) {
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tok = tok->next()->link();
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}
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// Skip uncaught exceptions
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else if (Token::simpleMatch(tok, "if ( ! std :: uncaught_exception ( ) ) {")) {
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tok = tok->next()->link(); // end of if ( ... )
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tok = tok->next()->link(); // end of { ... }
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}
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// throw found within a destructor
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else if (tok->str() == "throw") {
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destructorsError(tok, scope->className);
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break;
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}
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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 CheckExceptionSafety::deallocThrow()
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{
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if (!_settings->isEnabled(Settings::WARNING))
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return;
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const bool printInconclusive = _settings->inconclusive;
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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// Deallocate a global/member pointer and then throw exception
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// the pointer will be a dead pointer
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const std::size_t functions = symbolDatabase->functionScopes.size();
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for (std::size_t i = 0; i < functions; ++i) {
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const Scope * scope = symbolDatabase->functionScopes[i];
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for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
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// only looking for delete now
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if (tok->str() != "delete")
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continue;
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// Check if this is something similar with: "delete p;"
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tok = tok->next();
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if (Token::simpleMatch(tok, "[ ]"))
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tok = tok->tokAt(2);
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if (!tok || tok == scope->classEnd)
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break;
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if (!Token::Match(tok, "%var% ;"))
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continue;
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// we only look for global variables
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const Variable *var = tok->variable();
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if (!var || !(var->isGlobal() || var->isStatic()))
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continue;
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const unsigned int varid(tok->varId());
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// Token where throw occurs
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const Token *throwToken = nullptr;
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// is there a throw after the deallocation?
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const Token* const end2 = tok->scope()->classEnd;
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for (const Token *tok2 = tok; tok2 != end2; tok2 = tok2->next()) {
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// Throw after delete -> Dead pointer
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if (tok2->str() == "throw") {
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if (printInconclusive) { // For inconclusive checking, throw directly.
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deallocThrowError(tok2, tok->str());
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break;
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}
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throwToken = tok2;
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}
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// Variable is assigned -> Bail out
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else if (Token::Match(tok2, "%varid% =", varid)) {
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if (throwToken) // For non-inconclusive checking, wait until we find an assignment to it. Otherwise we assume it is safe to leave a dead pointer.
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deallocThrowError(throwToken, tok2->str());
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break;
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}
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// Variable passed to function. Assume it becomes assigned -> Bail out
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else if (Token::Match(tok2, "[,(] &| %varid% [,)]", varid)) // TODO: No bailout if passed by value or as const reference
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break;
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}
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}
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}
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}
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//---------------------------------------------------------------------------
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// catch(const exception & err)
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// {
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// throw err; // <- should be just "throw;"
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// }
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//---------------------------------------------------------------------------
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void CheckExceptionSafety::checkRethrowCopy()
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{
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if (!_settings->isEnabled(Settings::STYLE))
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return;
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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for (std::list<Scope>::const_iterator i = symbolDatabase->scopeList.begin(); i != symbolDatabase->scopeList.end(); ++i) {
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if (i->type != Scope::eCatch)
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continue;
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const unsigned int varid = i->classStart->tokAt(-2)->varId();
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if (varid) {
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for (const Token* tok = i->classStart->next(); tok && tok != i->classEnd; tok = tok->next()) {
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if (Token::simpleMatch(tok, "catch (") && tok->next()->link() && tok->next()->link()->next()) { // Don't check inner catch - it is handled in another iteration of outer loop.
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tok = tok->next()->link()->next()->link();
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if (!tok)
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break;
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} else if (Token::Match(tok, "throw %varid% ;", varid))
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rethrowCopyError(tok, tok->strAt(1));
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}
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}
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}
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}
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//---------------------------------------------------------------------------
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// try {} catch (std::exception err) {} <- Should be "std::exception& err"
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//---------------------------------------------------------------------------
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void CheckExceptionSafety::checkCatchExceptionByValue()
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{
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if (!_settings->isEnabled(Settings::STYLE))
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return;
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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for (std::list<Scope>::const_iterator i = symbolDatabase->scopeList.begin(); i != symbolDatabase->scopeList.end(); ++i) {
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if (i->type != Scope::eCatch)
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continue;
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// Find a pass-by-value declaration in the catch(), excluding basic types
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// e.g. catch (std::exception err)
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const Variable *var = i->classStart->tokAt(-2)->variable();
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if (var && var->isClass() && !var->isPointer() && !var->isReference())
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catchExceptionByValueError(i->classDef);
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}
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}
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static const Token * functionThrowsRecursive(const Function * function, std::set<const Function *> & recursive)
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{
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// check for recursion and bail if found
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if (!recursive.insert(function).second)
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return nullptr;
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if (!function->functionScope)
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return nullptr;
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for (const Token *tok = function->functionScope->classStart->next();
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tok != function->functionScope->classEnd; tok = tok->next()) {
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if (tok->str() == "try") {
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// just bail for now
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break;
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}
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if (tok->str() == "throw") {
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return tok;
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} else if (tok->function()) {
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const Function * called = tok->function();
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// check if called function has an exception specification
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if (called->isThrow() && called->throwArg) {
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return tok;
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} else if (called->isNoExcept() && called->noexceptArg &&
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called->noexceptArg->str() != "true") {
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return tok;
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} else if (functionThrowsRecursive(called, recursive)) {
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return tok;
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}
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}
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}
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return nullptr;
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}
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static const Token * functionThrows(const Function * function)
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{
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std::set<const Function *> recursive;
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return functionThrowsRecursive(function, recursive);
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}
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//--------------------------------------------------------------------------
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// void func() noexcept { throw x; }
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// void func() throw() { throw x; }
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// void func() __attribute__((nothrow)); void func() { throw x; }
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//--------------------------------------------------------------------------
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void CheckExceptionSafety::nothrowThrows()
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{
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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const std::size_t functions = symbolDatabase->functionScopes.size();
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for (std::size_t i = 0; i < functions; ++i) {
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const Scope * scope = symbolDatabase->functionScopes[i];
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const Function* function = scope->function;
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if (!function)
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continue;
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// check noexcept and noexcept(true) functions
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if (function->isNoExcept() &&
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(!function->noexceptArg || function->noexceptArg->str() == "true")) {
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const Token *throws = functionThrows(function);
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if (throws)
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noexceptThrowError(throws);
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}
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// check throw() functions
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else if (function->isThrow() && !function->throwArg) {
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const Token *throws = functionThrows(function);
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if (throws)
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noexceptThrowError(throws);
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}
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// check __attribute__((nothrow)) or __declspec(nothrow) functions
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else if (function->isAttributeNothrow()) {
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const Token *throws = functionThrows(function);
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if (throws)
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noexceptThrowError(throws);
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}
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}
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}
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//--------------------------------------------------------------------------
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// void func() { functionWithExceptionSpecification(); }
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//--------------------------------------------------------------------------
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void CheckExceptionSafety::unhandledExceptionSpecification()
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{
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if (!_settings->isEnabled(Settings::STYLE) || !_settings->inconclusive)
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return;
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const SymbolDatabase* const symbolDatabase = _tokenizer->getSymbolDatabase();
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const std::size_t functions = symbolDatabase->functionScopes.size();
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for (std::size_t i = 0; i < functions; ++i) {
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const Scope * scope = symbolDatabase->functionScopes[i];
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// only check functions without exception epecification
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if (scope->function && !scope->function->isThrow() &&
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scope->className != "main" && scope->className != "wmain" &&
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scope->className != "_tmain" && scope->className != "WinMain") {
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for (const Token *tok = scope->function->functionScope->classStart->next();
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tok != scope->function->functionScope->classEnd; tok = tok->next()) {
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if (tok->str() == "try") {
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break;
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} else if (tok->function()) {
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const Function * called = tok->function();
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// check if called function has an exception specification
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if (called->isThrow() && called->throwArg) {
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unhandledExceptionSpecificationError(tok, called->tokenDef, scope->function->name());
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break;
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}
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}
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}
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}
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}
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}
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