120 lines
4.7 KiB
C++
120 lines
4.7 KiB
C++
/*
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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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#include "valueflow.h"
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#include "errorlogger.h"
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#include "mathlib.h"
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#include "settings.h"
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#include "symboldatabase.h"
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#include "token.h"
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#include "tokenlist.h"
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static void bailout(TokenList *tokenlist, ErrorLogger *errorLogger, const Token *tok, const std::string &what)
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{
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std::list<ErrorLogger::ErrorMessage::FileLocation> callstack;
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callstack.push_back(ErrorLogger::ErrorMessage::FileLocation(tok,tokenlist));
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ErrorLogger::ErrorMessage errmsg(callstack, Severity::debug, "ValueFlow bailout: " + what, "valueFlowBailout", false);
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errorLogger->reportErr(errmsg);
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}
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static void valueFlowBeforeCondition(TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
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{
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for (Token *tok = tokenlist->front(); tok; tok = tok->next()) {
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unsigned int varid;
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MathLib::bigint num;
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const Variable *var;
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if (Token::Match(tok, "==|!=|>=|<=") && tok->astOperand1() && tok->astOperand2()) {
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if (tok->astOperand1()->isName() && tok->astOperand2()->isNumber()) {
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varid = tok->astOperand1()->varId();
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var = tok->astOperand1()->variable();
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num = MathLib::toLongNumber(tok->astOperand2()->str());
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} else if (tok->astOperand1()->isNumber() && tok->astOperand2()->isName()) {
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varid = tok->astOperand2()->varId();
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var = tok->astOperand2()->variable();
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num = MathLib::toLongNumber(tok->astOperand1()->str());
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} else {
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continue;
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}
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} else if (Token::Match(tok->previous(), "if|while ( %var% %oror%|&&|)") ||
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Token::Match(tok, "%oror%|&& %var% %oror%|&&|)")) {
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varid = tok->next()->varId();
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var = tok->next()->variable();
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num = 0;
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} else if (tok->str() == "!" && tok->astOperand1() && tok->astOperand1()->isName()) {
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varid = tok->astOperand1()->varId();
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var = tok->astOperand1()->variable();
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num = 0;
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} else {
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continue;
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}
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if (varid == 0U)
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continue;
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// bailout: global variables
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if (var && var->isGlobal()) {
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if (settings->debugwarnings)
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bailout(tokenlist, errorLogger, tok, "global variable " + var->nameToken()->str());
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continue;
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}
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struct ValueFlow::Value val;
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val.condition = tok;
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val.intvalue = num;
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for (Token *tok2 = tok->previous(); ; tok2 = tok2->previous()) {
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if (!tok2) {
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if (settings->debugwarnings) {
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std::list<ErrorLogger::ErrorMessage::FileLocation> callstack;
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callstack.push_back(ErrorLogger::ErrorMessage::FileLocation(tok,tokenlist));
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ErrorLogger::ErrorMessage errmsg(callstack, Severity::debug, "iterated too far", "debugValueFlowBeforeCondition", false);
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errorLogger->reportErr(errmsg);
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}
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break;
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}
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if (tok2->varId() == varid) {
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// bailout: assignment
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if (Token::Match(tok2, "%var% =")) {
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if (settings->debugwarnings)
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bailout(tokenlist, errorLogger, tok2, "assignment of " + tok2->str());
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break;
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}
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tok2->values.push_back(val);
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if (var && tok2 == var->nameToken())
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break;
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}
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if (tok2->str() == "}") {
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if (settings->debugwarnings)
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bailout(tokenlist, errorLogger, tok2, "variable " + var->nameToken()->str() + " stopping on }");
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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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void ValueFlow::setValues(TokenList *tokenlist, ErrorLogger *errorLogger, const Settings *settings)
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{
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for (Token *tok = tokenlist->front(); tok; tok = tok->next())
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tok->values.clear();
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valueFlowBeforeCondition(tokenlist, errorLogger, settings);
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}
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