2013-05-07 21:35:16 +02:00
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/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2013 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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// You should not write statements with side effects in assert()
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//---------------------------------------------------------------------------
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#include "checkassert.h"
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#include "symboldatabase.h"
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//---------------------------------------------------------------------------
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// Register this check class (by creating a static instance of it)
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namespace {
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CheckAssert instance;
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}
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void CheckAssert::assertWithSideEffects()
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{
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if (!_settings->isEnabled("warning"))
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return;
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const Token *tok = findAssertPattern(_tokenizer->tokens());
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const Token *endTok = tok ? tok->next()->link() : NULL;
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while (tok && endTok) {
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for (const Token* tmp = tok->tokAt(1); tmp != endTok; tmp = tmp->next()) {
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checkVariableAssignment(tmp, true);
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if (tmp->isName() && tmp->type() == Token::eFunction) {
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const Function* f = tmp->function();
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if (f->argCount() == 0 && f->isConst) continue;
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// functions with non-const references
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else if (f->argCount() != 0) {
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for (std::list<Variable>::const_iterator it = f->argumentList.begin(); it != f->argumentList.end(); ++it) {
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if (it->isConst() || it->isLocal()) continue;
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else if (it->isReference()) {
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const Token* next = it->nameToken()->next();
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bool isAssigned = checkVariableAssignment(next, false);
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if (isAssigned)
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sideEffectInAssertError(tmp, f->name());
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continue;
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}
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}
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}
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// variables in function scope
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const Scope* scope = f->functionScope;
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if (!scope) continue;
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for (const Token *tok2 = scope->classStart; tok2 != scope->classEnd; tok2 = tok2->next()) {
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if (tok2 && tok2->type() != Token::eAssignmentOp && tok2->type() != Token::eIncDecOp) continue;
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const Variable* var = tok2->previous()->variable();
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if (!var) continue;
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std::vector<const Token*> returnTokens; // find all return statements
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for (const Token *rt = scope->classStart; rt != scope->classEnd; rt = rt->next()) {
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if (!Token::Match(rt, "return %any%")) continue;
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returnTokens.push_back(rt);
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}
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bool noReturnInScope = true;
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for (std::vector<const Token*>::iterator rt = returnTokens.begin(); rt != returnTokens.end(); ++rt) {
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noReturnInScope &= !inSameScope(*rt, tok2);
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}
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if (noReturnInScope) continue;
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bool isAssigned = checkVariableAssignment(tok2, false);
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if (isAssigned)
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sideEffectInAssertError(tmp, f->name());
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}
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}
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}
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tok = findAssertPattern(endTok->next());
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endTok = tok ? tok->next()->link() : NULL;
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}
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}
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//---------------------------------------------------------------------------
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void CheckAssert::sideEffectInAssertError(const Token *tok, const std::string& functionName)
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{
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reportError(tok, Severity::warning,
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"assertWithSideEffect", "Assert statement calls a function which may have desired side effects: '" + functionName + "'.\n"
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"Non-pure function: '" + functionName + "' is called inside assert statement. "
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"Assert statements are removed from release builds so the code inside "
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"assert statement is not executed. If the code is needed also in release "
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"builds, this is a bug.");
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}
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void CheckAssert::assignmentInAssertError(const Token *tok, const std::string& varname)
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{
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reportError(tok, Severity::warning,
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"assignmentInAssert", "Assert statement modifies '" + varname + "'.\n"
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"Variable '" + varname + "' is modified insert assert statement. "
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"Assert statements are removed from release builds so the code inside "
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"assert statement is not executed. If the code is needed also in release "
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"builds, this is a bug.");
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}
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// checks if side effects happen on the variable prior to tmp
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2013-05-09 06:29:12 +02:00
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bool CheckAssert::checkVariableAssignment(const Token* assignTok, bool reportErr /*= true*/)
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2013-05-07 21:35:16 +02:00
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{
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const Variable* v = assignTok->previous()->variable();
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if (!v) return false;
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// assignment
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if (assignTok->isAssignmentOp() || assignTok->type() == Token::eIncDecOp) {
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if (v->isConst()) return false;
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2013-05-09 06:29:12 +02:00
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if (reportErr) // report as variable assignment error
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2013-05-07 21:35:16 +02:00
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assignmentInAssertError(assignTok, v->name());
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return true;
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}
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return false;
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// TODO: function calls on v
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}
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const Token* CheckAssert::findAssertPattern(const Token* start)
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{
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return Token::findmatch(start, "assert ( %any%");
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}
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bool CheckAssert::inSameScope(const Token* returnTok, const Token* assignTok)
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{
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// TODO: even if a return is in the same scope, the assignment might not affect it.
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return returnTok->scope() == assignTok->scope();
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}
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