circuitpython/py/gc_long_lived.c

150 lines
6.1 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/emitglue.h"
#include "py/gc_long_lived.h"
#include "py/gc.h"
#include "py/mpstate.h"
mp_obj_fun_bc_t *make_fun_bc_long_lived(mp_obj_fun_bc_t *fun_bc, uint8_t max_depth) {
#ifndef MICROPY_ENABLE_GC
return fun_bc;
#endif
if (fun_bc == NULL || MP_OBJ_FROM_PTR(fun_bc) == mp_const_none || max_depth == 0) {
return fun_bc;
}
fun_bc->bytecode = gc_make_long_lived((byte *)fun_bc->bytecode);
fun_bc->globals = make_dict_long_lived(fun_bc->globals, max_depth - 1);
for (uint32_t i = 0; i < gc_nbytes(fun_bc->const_table) / sizeof(mp_obj_t); i++) {
// Skip things that aren't allocated on the heap (and hence have zero bytes.)
if (gc_nbytes(MP_OBJ_TO_PTR(fun_bc->const_table[i])) == 0) {
continue;
}
// Try to detect raw code.
mp_raw_code_t *raw_code = MP_OBJ_TO_PTR(fun_bc->const_table[i]);
if (raw_code->kind == MP_CODE_BYTECODE) {
raw_code->fun_data = gc_make_long_lived((byte *)raw_code->fun_data);
raw_code->const_table = gc_make_long_lived((byte *)raw_code->const_table);
}
((mp_uint_t *)fun_bc->const_table)[i] = (mp_uint_t)make_obj_long_lived(
(mp_obj_t)fun_bc->const_table[i], max_depth - 1);
}
fun_bc->const_table = gc_make_long_lived((mp_uint_t *)fun_bc->const_table);
// extra_args stores keyword only argument default values.
size_t words = gc_nbytes(fun_bc) / sizeof(mp_uint_t *);
// Functions (mp_obj_fun_bc_t) have four pointers (base, globals, bytecode and const_table)
// before the variable length extra_args so remove them from the length.
for (size_t i = 0; i < words - 4; i++) {
if (MP_OBJ_TO_PTR(fun_bc->extra_args[i]) == NULL) {
continue;
}
if (mp_obj_is_type(fun_bc->extra_args[i], &mp_type_dict)) {
fun_bc->extra_args[i] = MP_OBJ_FROM_PTR(make_dict_long_lived(MP_OBJ_TO_PTR(fun_bc->extra_args[i]), max_depth - 1));
} else {
fun_bc->extra_args[i] = make_obj_long_lived(fun_bc->extra_args[i], max_depth - 1);
}
}
return gc_make_long_lived(fun_bc);
}
mp_obj_property_t *make_property_long_lived(mp_obj_property_t *prop, uint8_t max_depth) {
#ifndef MICROPY_ENABLE_GC
return prop;
#endif
if (max_depth == 0) {
return prop;
}
prop->proxy[0] = make_obj_long_lived(prop->proxy[0], max_depth - 1);
prop->proxy[1] = make_obj_long_lived(prop->proxy[1], max_depth - 1);
prop->proxy[2] = make_obj_long_lived(prop->proxy[2], max_depth - 1);
return gc_make_long_lived(prop);
}
mp_obj_dict_t *make_dict_long_lived(mp_obj_dict_t *dict, uint8_t max_depth) {
#ifndef MICROPY_ENABLE_GC
return dict;
#endif
if (dict == NULL || max_depth == 0 || dict == &MP_STATE_VM(dict_main) || dict->map.is_fixed) {
return dict;
}
// Don't recurse unnecessarily. Return immediately if we've already seen this dict.
if (dict->map.scanning) {
return dict;
}
// Mark that we're processing this dict.
dict->map.scanning = 1;
// Update all of the references first so that we reduce the chance of references to the old
// copies.
dict->map.table = gc_make_long_lived(dict->map.table);
for (size_t i = 0; i < dict->map.alloc; i++) {
if (mp_map_slot_is_filled(&dict->map, i)) {
mp_obj_t value = dict->map.table[i].value;
dict->map.table[i].value = make_obj_long_lived(value, max_depth - 1);
}
}
dict = gc_make_long_lived(dict);
// Done recursing through this dict.
dict->map.scanning = 0;
return dict;
}
mp_obj_str_t *make_str_long_lived(mp_obj_str_t *str) {
str->data = gc_make_long_lived((byte *)str->data);
return gc_make_long_lived(str);
}
mp_obj_t make_obj_long_lived(mp_obj_t obj, uint8_t max_depth) {
#ifndef MICROPY_ENABLE_GC
return obj;
#endif
if (MP_OBJ_TO_PTR(obj) == NULL) {
return obj;
}
// If not in the GC pool, do nothing. This can happen (at least) when
// there are frozen mp_type_bytes objects in ROM.
if (!VERIFY_PTR((void *)obj)) {
return obj;
}
if (mp_obj_is_type(obj, &mp_type_fun_bc)) {
mp_obj_fun_bc_t *fun_bc = MP_OBJ_TO_PTR(obj);
return MP_OBJ_FROM_PTR(make_fun_bc_long_lived(fun_bc, max_depth));
} else if (mp_obj_is_type(obj, &mp_type_property)) {
mp_obj_property_t *prop = MP_OBJ_TO_PTR(obj);
return MP_OBJ_FROM_PTR(make_property_long_lived(prop, max_depth));
} else if (mp_obj_is_type(obj, &mp_type_str) || mp_obj_is_type(obj, &mp_type_bytes)) {
mp_obj_str_t *str = MP_OBJ_TO_PTR(obj);
return MP_OBJ_FROM_PTR(make_str_long_lived(str));
} else if (mp_obj_is_type(obj, &mp_type_type)) {
// Types are already long lived during creation.
return obj;
} else {
return MP_OBJ_FROM_PTR(gc_make_long_lived(MP_OBJ_TO_PTR(obj)));
}
}