Method simplifyBitfields

lib/tokenize.cpp:10259–10341

Simplify bitfields

// Simplify bitfields
void Tokenizer::simplifyBitfields()
{
    std::size_t anonymousBitfieldCounter = 0;
    for (Token *tok = list.front(); tok; tok = tok->next()) {
        Token *last = nullptr;

        if (Token::simpleMatch(tok, "for ("))
            tok = tok->linkAt(1);

        if (!Token::Match(tok, ";|{|}|public:|protected:|private:"))
            continue;

        const bool isEnum = tok->str() == "}" && isEnumStart(tok->link());

        const auto tooLargeError = [this](const Token *tok) {
            const auto max = std::numeric_limits<short>::max();
            reportError(tok,
                        Severity::warning,
                        "tooLargeBitField",
                        "Bit-field size exceeds max number of bits " + std::to_string(max));
        };

        Token* typeTok = tok->next();
        while (Token::Match(typeTok, "const|volatile"))
            typeTok = typeTok->next();
        if (Token::Match(typeTok, ":: %name%"))
            typeTok = typeTok->next();
        while (Token::Match(typeTok, "%name% :: %name%"))
            typeTok = typeTok->tokAt(2);
        if (Token::Match(typeTok, "%type% %name% :") &&
            !Token::Match(tok->next(), "case|public|protected|private|class|struct") &&
            !Token::simpleMatch(tok->tokAt(2), "default :")) {
            Token *tok1 = typeTok->next();
            if (Token::Match(tok1, "%name% : %num% [;=,]"))
                if (!tok1->setBits(MathLib::toBigNumber(tok1->tokAt(2))))
                    tooLargeError(tok1->tokAt(2));
            if (tok1 && tok1->tokAt(2) &&
                (Token::Match(tok1->tokAt(2), "%bool%|%num%") ||
                 !Token::Match(tok1->tokAt(2), "public|protected|private| %type% ::|<|,|{|;"))) {
                while (tok1->next() && !Token::Match(tok1->next(), "[;,)]{}=]")) {
                    if (Token::Match(tok1->next(), "[([]"))
                        Token::eraseTokens(tok1, tok1->linkAt(1));
                    tok1->deleteNext();
                }

                last = tok1->next();
            }
        } else if (isEnum && Token::Match(tok, "} %name%| : %num% ;")) {
            if (tok->strAt(1) == ":") {
                tok->deleteNext(2);
                tok->insertToken("Anonymous");
            } else {
                tok->next()->deleteNext(2);
            }
        } else if (Token::Match(typeTok, "%type% : %num%|%bool% ;") &&
                   typeTok->str() != "default") {
            const std::size_t id = anonymousBitfieldCounter++;
            const std::string name = "anonymous@" + std::to_string(id);