MicroPython Forum (Archive)

In my codebase it sure does ... void mp_lexer_free(mp_lexer_t *lex) { if (lex) { lex->reader.close(lex->reader.data); vstr_clear(&lex->vstr); m_del(uint16_t, lex->indent_level, lex->alloc_indent_level); m_del_obj(mp_lexer_t, lex); <============= } } #define m_del_obj(type, ptr) (m_del(type, ptr, 1))...

Hi, After analyzing execute_from_str, it seems that it is not allowed to create some helper threads and then exit the script, because the entire bytecode (or whatever you call the output of the compilation process) will be cleaned up by the garbage collector as there is no longer a reference to it. ...

Because mp_parse 'frees' it. So 'collected' is the wrong word, it is explicitly freed by the code, not by the GC.

But 'lex' itself is collected, so you are dereferencing a memory address that no longer contains a valid value
You do not even get to the qstring anymore....

mp_obj_t execute_from_str(const char *str) { nlr_buf_t nlr; if (nlr_push(&nlr) == 0) { mp_lexer_t *lex = mp_lexer_new_from_str_len(0/*MP_QSTR_*/, str, strlen(str), false); mp_parse_tree_t pt = mp_parse(lex, MP_PARSE_FILE_INPUT); mp_obj_t module_fun = mp_compile(&pt, lex->source_name, MP_EMIT_OPT_NO...

Hi, Class methods (cfr MP_DEFINE_CONST_CLASSMETHOD_OBJ) have a first argument 'class' when being called. In none of the code where MP_DEFINE_CONST_CLASSMETHOD_OBJ is used in the micropython codebase, something seems to be done with this first argument (which means that all these could be replaced by...

If you call gc_collect(), the correct stack is correctly taken into account so your entire first example is incorrect. Ok some progress, now we are on the same page talking about the entire stack and the objects currently referenced from it and not some object that at some point in the past was on ...

Ok, thanks for the elaboration. I now fully understand what you are saying, and i should absolutely recheck my code to see if I do stuff like that but that is a problem you will have with any thread/stack (no matter where it is located). (I have threading enabled and have several threads running) Th...

Ok seriously I do not know what to make from your replies, either I am having a brain fart and there is something I am missing in which case i apologize or you do not understand what I am trying to point out (or you are having a bad day and you are just trolling with me here). Assuming you are serio...

(also: after moving the stack to the GC heap which is in external sram, the lexer is now dead slow ( 9 seconds which triggers my watchdog versus 3s with the stack still in internal memory of the microcontroller) so i am still not out of the woods )