76 lines
2.7 KiB
C++
76 lines
2.7 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 "token.h"
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#include "mathlib.h"
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static void valueFlowBeforeCondition(Token *tokens)
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{
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for (Token *tok = tokens; tok; tok = tok->next()) {
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unsigned int varid;
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MathLib::bigint num;
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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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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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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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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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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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struct ValueFlow::Value val;
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val.link = tok;
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val.intvalue = num;
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for (Token *tok2 = tok->previous(); tok2; tok2 = tok2->previous()) {
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if (tok2->varId() == varid)
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tok2->values.push_back(val);
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if (tok2->str() == "{") {
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if (!Token::simpleMatch(tok2->previous(), ") {"))
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break;
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if (!Token::simpleMatch(tok2->previous()->link()->previous(), "if ("))
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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(Token *tokens)
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{
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for (Token *tok = tokens; tok; tok = tok->next())
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tok->values.clear();
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valueFlowBeforeCondition(tokens);
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}
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