Function GetProfilerString

engine/script/src/script.cpp:2115–2167

* To reduce the overhead of the profiler when calling lua functions we avoid using dmSnPrintf. * dmSnPrintf uses vsnprintf with variable number of arguments but we only need string concatenation for * the most part. Also, we use our knownledge when building the string to get the string length directly * without resorting to strlen. * Building this string is particularly expensive o

    * the overhead of the profiler when enabled.
    */
    const char* GetProfilerString(lua_State* L, int optional_callback_index, const char* source_file_name, const char* function_name, const char* optional_message_name, char* buffer, uint32_t buffer_size)
    {
        if (!ProfileIsInitialized())
            return 0;

        char* w_ptr = buffer;
        const char* w_ptr_end = buffer + buffer_size - 1;

        const char* function_source = source_file_name;

        if (optional_callback_index != 0)
        {
            LuaFunctionInfo fi;
            if (dmScript::GetLuaFunctionRefInfo(L, optional_callback_index, &fi))
            {
                if (fi.m_FileName)
                {
                    function_source = fi.m_FileName;
                }
                if (fi.m_OptionalName)
                {
                    w_ptr = ConcatString(w_ptr, w_ptr_end, fi.m_OptionalName);
                }
                else
                {
                    char function_line_number_buffer[16];
                    dmSnPrintf(function_line_number_buffer, sizeof(function_line_number_buffer), "l(%d)", fi.m_LineNumber);
                    w_ptr = ConcatString(w_ptr, w_ptr_end, function_line_number_buffer);
                }
            }
            else
            {
                w_ptr = ConcatString(w_ptr, w_ptr_end, "<unknown>");
            }

        }
        else
        {
            w_ptr = ConcatString(w_ptr, w_ptr_end, function_name);
        }

        if (optional_message_name)
        {
            w_ptr = ConcatString(w_ptr, w_ptr_end, "[");
            w_ptr = ConcatString(w_ptr, w_ptr_end, optional_message_name);
            w_ptr = ConcatString(w_ptr, w_ptr_end, "]");
        }
        w_ptr = ConcatString(w_ptr, w_ptr_end, "@");
        w_ptr = ConcatString(w_ptr, w_ptr_end, function_source);
        *w_ptr++ = 0;

        return buffer;
    }

    const char* GetTableStringValue(lua_State* L, int table_index, const char* key, const char* default_value)
    {