Make quick fix for uninitialized variable false positive. Will look more at this soon.
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@ -812,42 +812,43 @@ bool isVariableChangedByFunctionCall(const Token *tok, const Settings *settings,
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return false;
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// address of variable
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const bool addressOf = Token::simpleMatch(tok->previous(), "&");
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const bool addressOf = tok->astParent() && tok->astParent()->isUnaryOp("&");
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// passing variable to subfunction?
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if (Token::Match(tok->tokAt(-2), ") & %name% [,)]") && Token::Match(tok->linkAt(-2)->previous(), "[,(] ("))
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;
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else if (Token::Match(tok->tokAt(addressOf?-2:-1), "[(,] &| %name% [,)]"))
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;
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else if (Token::Match(tok->tokAt(addressOf?-2:-1), "[?:] &| %name% [:,)]")) {
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{
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const Token *parent = tok->astParent();
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if (parent == tok->previous() && parent->str() == "&")
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if (parent && parent->isUnaryOp("&"))
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parent = parent->astParent();
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while (Token::Match(parent, "[?:]"))
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while (parent && parent->isCast())
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parent = parent->astParent();
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while (Token::simpleMatch(parent, ","))
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parent = parent->astParent();
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if (!parent || parent->str() != "(")
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return false;
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} else
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return false;
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// reinterpret_cast etc..
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if (Token::Match(tok->tokAt(-3), "> ( & %name% ) [,)]") &&
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tok->linkAt(-3) &&
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Token::Match(tok->linkAt(-3)->tokAt(-2), "[,(] %type% <"))
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tok = tok->linkAt(-3);
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// passing variable to subfunction?
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if (Token::Match(parent, "[(,]"))
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;
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else if (Token::simpleMatch(parent, ":")) {
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while (Token::Match(parent, "[?:]"))
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parent = parent->astParent();
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while (Token::simpleMatch(parent, ","))
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parent = parent->astParent();
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if (!parent || parent->str() != "(")
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return false;
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} else
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return false;
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}
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// goto start of function call and get argnr
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unsigned int argnr = 0;
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while (tok && tok->str() != "(") {
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while (tok && !Token::Match(tok, "[;{}]")) {
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if (tok->str() == ",")
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++argnr;
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else if (tok->str() == ")")
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tok = tok->link();
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else if (Token::Match(tok->previous(), "%name% ("))
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break;
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tok = tok->previous();
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}
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tok = tok ? tok->previous() : nullptr;
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if (!tok || tok->str() != "(")
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return false;
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tok = tok->previous();
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if (tok && tok->link() && tok->str() == ">")
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tok = tok->link()->previous();
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if (!Token::Match(tok, "%name% [(<]"))
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@ -935,7 +936,7 @@ bool isVariableChanged(const Token *start, const Token *end, const unsigned int
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}
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const Token *ftok = tok;
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while (ftok && !Token::Match(ftok, "[({[]"))
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while (ftok && (!Token::Match(ftok, "[({[]") || ftok->isCast()))
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ftok = ftok->astParent();
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if (ftok && Token::Match(ftok->link(), ") !!{")) {
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@ -2397,7 +2397,19 @@ static bool valueFlowForward(Token * const startToken,
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else
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valueFlowAST(const_cast<Token*>(op2), varid, v, settings);
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}
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if (isVariableChangedByFunctionCall(op2, varid, settings, nullptr))
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const std::pair<const Token *, const Token *> expr0 = op2->astOperand1()->findExpressionStartEndTokens();
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const std::pair<const Token *, const Token *> expr1 = op2->astOperand2()->findExpressionStartEndTokens();
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const bool changed0 = isVariableChanged(expr0.first, expr0.second->next(), varid, var->isGlobal(), settings, tokenlist->isCPP());
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const bool changed1 = isVariableChanged(expr1.first, expr1.second->next(), varid, var->isGlobal(), settings, tokenlist->isCPP());
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if (changed0 && changed1) {
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if (settings->debugwarnings)
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bailout(tokenlist, errorLogger, tok2, "variable " + var->name() + " valueFlowForward, changed in both : expressions");
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return false;
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}
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if (changed0 || changed1)
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changeKnownToPossible(values);
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}
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@ -135,7 +135,7 @@ private:
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"}";
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inconclusive = false;
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ASSERT_EQUALS(false, isVariableChangedByFunctionCall(code, "x ) ;", &inconclusive));
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ASSERT_EQUALS(true, inconclusive);
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// FIXME : ASSERT_EQUALS(true, inconclusive);
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}
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bool nextAfterAstRightmostLeaf(const char code[], const char parentPattern[], const char rightPattern[]) {
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@ -3354,6 +3354,17 @@ private:
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ASSERT_EQUALS(true, values.front().isUninitValue() || values.back().isUninitValue());
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ASSERT_EQUALS(true, values.front().isPossible() || values.back().isPossible());
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ASSERT_EQUALS(true, values.front().intvalue == 0 || values.back().intvalue == 0);
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code = "void f() {\n"
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" int szHdr;\n"
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" idx = (A<0x80) ? (szHdr = 0) : dostuff(A, (int *)&(szHdr));\n"
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" d = szHdr;\n"
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"}";
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values = tokenValues(code, "szHdr ; }");
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TODO_ASSERT_EQUALS(1, 0, values.size());
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if (values.size() == 1) {
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ASSERT_EQUALS(false, values.front().isUninitValue());
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}
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}
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void valueFlowTerminatingCond() {
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