circuitpython/py/mpstate.h

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2014 Damien P. George
*
* 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.
*/
#ifndef __MICROPY_INCLUDED_PY_MPSTATE_H__
#define __MICROPY_INCLUDED_PY_MPSTATE_H__
#include <stdint.h>
#include "py/mpconfig.h"
#include "py/misc.h"
#include "py/nlr.h"
#include "py/obj.h"
#include "py/objlist.h"
#include "py/objexcept.h"
// This file contains structures defining the state of the Micro Python
// memory system, runtime and virtual machine. The state is a global
// variable, but in the future it is hoped that the state can become local.
// This structure hold information about the memory allocation system.
typedef struct _mp_state_mem_t {
#if MICROPY_MEM_STATS
size_t total_bytes_allocated;
size_t current_bytes_allocated;
size_t peak_bytes_allocated;
#endif
byte *gc_alloc_table_start;
mp_uint_t gc_alloc_table_byte_len;
#if MICROPY_ENABLE_FINALISER
byte *gc_finaliser_table_start;
#endif
byte *gc_pool_start;
byte *gc_pool_end;
int gc_stack_overflow;
mp_uint_t gc_stack[MICROPY_ALLOC_GC_STACK_SIZE];
mp_uint_t *gc_sp;
uint16_t gc_lock_depth;
// This variable controls auto garbage collection. If set to 0 then the
// GC won't automatically run when gc_alloc can't find enough blocks. But
// you can still allocate/free memory and also explicitly call gc_collect.
uint16_t gc_auto_collect_enabled;
mp_uint_t gc_last_free_atb_index;
#if MICROPY_PY_GC_COLLECT_RETVAL
mp_uint_t gc_collected;
#endif
} mp_state_mem_t;
// This structure hold runtime and VM information. It includes a section
// which contains root pointers that must be scanned by the GC.
typedef struct _mp_state_vm_t {
////////////////////////////////////////////////////////////
// START ROOT POINTER SECTION
// everything that needs GC scanning must go here
// this must start at the start of this structure
//
// Note: nlr asm code has the offset of this hard-coded
nlr_buf_t *nlr_top;
qstr_pool_t *last_pool;
// non-heap memory for creating an exception if we can't allocate RAM
mp_obj_exception_t mp_emergency_exception_obj;
// memory for exception arguments if we can't allocate RAM
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
#if MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE > 0
// statically allocated buf
byte mp_emergency_exception_buf[MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE];
#else
// dynamically allocated buf
byte *mp_emergency_exception_buf;
#endif
#endif
// dictionary with loaded modules (may be exposed as sys.modules)
mp_obj_dict_t mp_loaded_modules_dict;
// pending exception object (MP_OBJ_NULL if not pending)
volatile mp_obj_t mp_pending_exception;
// current exception being handled, for sys.exc_info()
#if MICROPY_PY_SYS_EXC_INFO
mp_obj_base_t *cur_exception;
#endif
// dictionary for the __main__ module
mp_obj_dict_t dict_main;
// these two lists must be initialised per port, after the call to mp_init
mp_obj_list_t mp_sys_path_obj;
mp_obj_list_t mp_sys_argv_obj;
// dictionary for overridden builtins
#if MICROPY_CAN_OVERRIDE_BUILTINS
mp_obj_dict_t *mp_module_builtins_override_dict;
#endif
// include any root pointers defined by a port
MICROPY_PORT_ROOT_POINTERS
// root pointers for extmod
#if MICROPY_PY_LWIP_SLIP
mp_obj_t lwip_slip_stream;
#endif
//
// END ROOT POINTER SECTION
////////////////////////////////////////////////////////////
// pointer and sizes to store interned string data
// (qstr_last_chunk can be root pointer but is also stored in qstr pool)
byte *qstr_last_chunk;
mp_uint_t qstr_last_alloc;
mp_uint_t qstr_last_used;
// Stack top at the start of program
// Note: this entry is used to locate the end of the root pointer section.
char *stack_top;
#if MICROPY_STACK_CHECK
mp_uint_t stack_limit;
#endif
mp_uint_t mp_optimise_value;
// size of the emergency exception buf, if it's dynamically allocated
#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF && MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE == 0
mp_int_t mp_emergency_exception_buf_size;
#endif
} mp_state_vm_t;
// This structure combines the above 2 structures, and adds the local
// and global dicts.
// Note: if this structure changes then revisit all nlr asm code since they
// have the offset of nlr_top hard-coded.
typedef struct _mp_state_ctx_t {
// these must come first for root pointer scanning in GC to work
mp_obj_dict_t *dict_locals;
mp_obj_dict_t *dict_globals;
// this must come next for root pointer scanning in GC to work
mp_state_vm_t vm;
mp_state_mem_t mem;
} mp_state_ctx_t;
extern mp_state_ctx_t mp_state_ctx;
#define MP_STATE_CTX(x) (mp_state_ctx.x)
#define MP_STATE_VM(x) (mp_state_ctx.vm.x)
#define MP_STATE_MEM(x) (mp_state_ctx.mem.x)
#endif // __MICROPY_INCLUDED_PY_MPSTATE_H__