Method parse_datasection

src/lib/parse/ParseContext.cpp:948–999

}

void ParseContext::parse_datasection() {
    tok_.expect(TokenType::LParen);
    tok_.expect_keyword("data");
    index_t data_idx = module_.datas.size();
    // optional Id
    if (tok_.peek().type == TokenType::Id) {
        std::string id = tok_.consume().text;
        if (data_map_.contains(id))
            throw Exception::Parse("duplicated data id '" + id + "'", tok_.location());
        data_map_[id] = data_idx;
    }

    WasmData& data = module_.datas.emplace_back();
    data.mode.type = WasmData::DataMode::Mode::passive;

    // Check for memuse or offset
    if (tok_.peek().type == TokenType::LParen) {
        const Token& kw = tok_.peek2();
        if (kw.type == TokenType::Keyword) {
            if (kw.text == "memory") {
                // memuse: '(' 'memory' memidx ')'
                tok_.consume(); tok_.consume();
                data.mode.memidx = parse_memidx();
                tok_.expect(TokenType::RParen);
            }
            // offset clause
            if (tok_.peek().type == TokenType::LParen &&
                tok_.peek2().type == TokenType::Keyword &&
                (tok_.peek2().text == "offset" ||
                 tok_.peek2().text == "i32.const" || tok_.peek2().text == "i64.const" ||
                 tok_.peek2().text == "f32.const" || tok_.peek2().text == "f64.const" ||
                 tok_.peek2().text == "ref.null" || tok_.peek2().text == "ref.func" ||
                 tok_.peek2().text == "global.get")) {
                tok_.consume(); // '('
                if (tok_.peek_keyword("offset")) tok_.consume();
                data.mode.offset = parse_constexpr();
                tok_.expect(TokenType::RParen);
                data.mode.type = WasmData::DataMode::Mode::active;
                if (!data.mode.memidx.has_value()) data.mode.memidx = 0;
            }
        }
    }

    // String* — data bytes
    while (tok_.peek().type == TokenType::String) {
        std::string bytes = parse_string_to_bytes(tok_.consume().text);
        size_t orig = data.init.size();
        data.init.resize(orig + bytes.size());
        std::memcpy(data.init.data() + orig, bytes.data(), bytes.size());
    }
    tok_.expect(TokenType::RParen);
}

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