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circuitpython/py/mpstate.h

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* SPDX-FileCopyrightText: 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/mpthread.h"
#include "py/misc.h"
#include "py/nlr.h"
#include "py/obj.h"
#include "py/objlist.h"
#include "py/objexcept.h"
// #if CIRCUITPY
// #error CIRCUITPY is TRUE in mpstate.h.
// #else
// #error CIRCUITPY is **FALSE** in mpstate.h
// #endif
// This file contains structures defining the state of the MicroPython
// 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.
enum {
#if MICROPY_PY_SYS_PS1_PS2
MP_SYS_MUTABLE_PS1,
MP_SYS_MUTABLE_PS2,
#endif
#if MICROPY_PY_SYS_TRACEBACKLIMIT
MP_SYS_MUTABLE_TRACEBACKLIMIT,
#endif
MP_SYS_MUTABLE_NUM,
};
// This structure contains dynamic configuration for the compiler.
#if MICROPY_DYNAMIC_COMPILER
typedef struct mp_dynamic_compiler_t {
uint8_t small_int_bits; // must be <= host small_int_bits
uint8_t native_arch;
uint8_t nlr_buf_num_regs;
} mp_dynamic_compiler_t;
extern mp_dynamic_compiler_t mp_dynamic_compiler;
#endif
// These are the values for sched_state
#define MP_SCHED_IDLE (1)
#define MP_SCHED_LOCKED (-1)
#define MP_SCHED_PENDING (0) // 0 so it's a quick check in the VM
typedef struct _mp_sched_item_t {
mp_obj_t func;
mp_obj_t arg;
} mp_sched_item_t;
// This structure holds information about a single contiguous area of
// memory reserved for the memory manager.
typedef struct _mp_state_mem_area_t {
#if MICROPY_GC_SPLIT_HEAP
struct _mp_state_mem_area_t *next;
#endif
byte *gc_alloc_table_start;
size_t gc_alloc_table_byte_len;
#if MICROPY_ENABLE_FINALISER
byte *gc_finaliser_table_start;
#endif
byte *gc_pool_start;
byte *gc_pool_end;
size_t gc_last_free_atb_index;
} mp_state_mem_area_t;
// 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
mp_state_mem_area_t area;
int gc_stack_overflow;
MICROPY_GC_STACK_ENTRY_TYPE gc_block_stack[MICROPY_ALLOC_GC_STACK_SIZE];
#if MICROPY_GC_SPLIT_HEAP
// Array that tracks the area for each block on gc_block_stack.
mp_state_mem_area_t *gc_area_stack[MICROPY_ALLOC_GC_STACK_SIZE];
#endif
// 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;
#if MICROPY_GC_ALLOC_THRESHOLD
size_t gc_alloc_amount;
size_t gc_alloc_threshold;
#endif
#if MICROPY_GC_SPLIT_HEAP
mp_state_mem_area_t *gc_last_free_area;
#endif
#if MICROPY_PY_GC_COLLECT_RETVAL
size_t gc_collected;
#endif
#if MICROPY_PY_THREAD && !MICROPY_PY_THREAD_GIL
// This is a global mutex used to make the GC thread-safe.
mp_thread_mutex_t gc_mutex;
#endif
// CIRCUITPY
void **permanent_pointers;
} 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 {
//
// CONTINUE ROOT POINTER SECTION
// This must start at the start of this structure and follows
// the state in the mp_state_thread_t structure, continuing
// the root pointer section from there.
//
qstr_pool_t *last_pool;
#if MICROPY_TRACKED_ALLOC
struct _m_tracked_node_t *m_tracked_head;
#endif
// non-heap memory for creating a traceback if we can't allocate RAM
mp_obj_traceback_t mp_emergency_traceback_obj;
// 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 (needs to be aligned to mp_obj_t)
mp_obj_t mp_emergency_exception_buf[MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE / sizeof(mp_obj_t)];
#else
// dynamically allocated buf
byte *mp_emergency_exception_buf;
#endif
#endif
#if MICROPY_KBD_EXCEPTION
// exception object of type KeyboardInterrupt
mp_obj_exception_t mp_kbd_exception;
#endif
// exception object of type ReloadException
mp_obj_exception_t mp_reload_exception;
// dictionary with loaded modules (may be exposed as sys.modules)
mp_obj_dict_t mp_loaded_modules_dict;
// dictionary for the __main__ module
mp_obj_dict_t dict_main;
// dictionary for overridden builtins
#if MICROPY_CAN_OVERRIDE_BUILTINS
mp_obj_dict_t *mp_module_builtins_override_dict;
#endif
// Include any root pointers registered with MP_REGISTER_ROOT_POINTER().
#ifndef NO_QSTR
// Only include root pointer definitions when not doing qstr extraction, because
// the qstr extraction stage also generates the root pointers header file.
#include "genhdr/root_pointers.h"
#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)
char *qstr_last_chunk;
size_t qstr_last_alloc;
size_t qstr_last_used;
#if MICROPY_PY_THREAD && !MICROPY_PY_THREAD_GIL
// This is a global mutex used to make qstr interning thread-safe.
mp_thread_mutex_t qstr_mutex;
#endif
#if MICROPY_ENABLE_COMPILER
mp_uint_t mp_optimise_value;
#if MICROPY_EMIT_NATIVE
uint8_t default_emit_opt; // one of MP_EMIT_OPT_xxx
#endif
#endif
// 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
#if MICROPY_ENABLE_SCHEDULER
volatile int16_t sched_state;
#if MICROPY_SCHEDULER_STATIC_NODES
// These will usually point to statically allocated memory. They are not
// traced by the GC. They are assumed to be zero'd out before mp_init() is
// called (usually because this struct lives in the BSS).
struct _mp_sched_node_t *sched_head;
struct _mp_sched_node_t *sched_tail;
#endif
// These index sched_queue.
uint8_t sched_len;
uint8_t sched_idx;
#endif
#if MICROPY_ENABLE_VM_ABORT
bool vm_abort;
nlr_buf_t *nlr_abort;
#endif
#if MICROPY_PY_THREAD_GIL
// This is a global mutex used to make the VM/runtime thread-safe.
mp_thread_mutex_t gil_mutex;
#endif
#if MICROPY_OPT_MAP_LOOKUP_CACHE
// See mp_map_lookup.
uint8_t map_lookup_cache[MICROPY_OPT_MAP_LOOKUP_CACHE_SIZE];
#endif
} mp_state_vm_t;
// This structure holds state that is specific to a given thread.
// Everything in this structure is scanned for root pointers.
typedef struct _mp_state_thread_t {
// Stack top at the start of program
char *stack_top;
// CIRCUITPY
#if MICROPY_MAX_STACK_USAGE
char *stack_bottom;
#endif
#if MICROPY_STACK_CHECK
size_t stack_limit;
#endif
#if MICROPY_ENABLE_PYSTACK
uint8_t *pystack_start;
uint8_t *pystack_end;
uint8_t *pystack_cur;
#endif
// Locking of the GC is done per thread.
uint16_t gc_lock_depth;
////////////////////////////////////////////////////////////
// START ROOT POINTER SECTION
// Everything that needs GC scanning must start here, and
// is followed by state in the mp_state_vm_t structure.
//
mp_obj_dict_t *dict_locals;
mp_obj_dict_t *dict_globals;
nlr_buf_t *nlr_top;
// pending exception object (MP_OBJ_NULL if not pending)
volatile mp_obj_t mp_pending_exception;
// If MP_OBJ_STOP_ITERATION is propagated then this holds its argument.
mp_obj_t stop_iteration_arg;
#if MICROPY_PY_SYS_SETTRACE
mp_obj_t prof_trace_callback;
bool prof_callback_is_executing;
struct _mp_code_state_t *current_code_state;
#endif
} mp_state_thread_t;
// This structure combines the above 3 structures.
// The order of the entries are important for root pointer scanning in the GC to work.
typedef struct _mp_state_ctx_t {
mp_state_thread_t thread;
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_VM(x) (mp_state_ctx.vm.x)
#define MP_STATE_MEM(x) (mp_state_ctx.mem.x)
#define MP_STATE_MAIN_THREAD(x) (mp_state_ctx.thread.x)
#if MICROPY_PY_THREAD
extern mp_state_thread_t *mp_thread_get_state(void);
#define MP_STATE_THREAD(x) (mp_thread_get_state()->x)
#define mp_thread_is_main_thread() (mp_thread_get_state() == &mp_state_ctx.thread)
#else
#define MP_STATE_THREAD(x) MP_STATE_MAIN_THREAD(x)
#define mp_thread_is_main_thread() (true)
#endif
#endif // MICROPY_INCLUDED_PY_MPSTATE_H
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