287 lines
8.9 KiB
C
287 lines
8.9 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_PY_MPSTATE_H
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#define MICROPY_INCLUDED_PY_MPSTATE_H
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#include <stdint.h>
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#include "py/mpconfig.h"
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#include "py/mpthread.h"
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#include "py/misc.h"
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#include "py/nlr.h"
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#include "py/obj.h"
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#include "py/objlist.h"
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#include "py/objexcept.h"
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// This file contains structures defining the state of the MicroPython
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// memory system, runtime and virtual machine. The state is a global
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// variable, but in the future it is hoped that the state can become local.
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enum {
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#if MICROPY_PY_SYS_PS1_PS2
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MP_SYS_MUTABLE_PS1,
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MP_SYS_MUTABLE_PS2,
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#endif
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#if MICROPY_PY_SYS_TRACEBACKLIMIT
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MP_SYS_MUTABLE_TRACEBACKLIMIT,
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#endif
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MP_SYS_MUTABLE_NUM,
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};
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// This structure contains dynamic configuration for the compiler.
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#if MICROPY_DYNAMIC_COMPILER
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typedef struct mp_dynamic_compiler_t {
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uint8_t small_int_bits; // must be <= host small_int_bits
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uint8_t native_arch;
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uint8_t nlr_buf_num_regs;
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} mp_dynamic_compiler_t;
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extern mp_dynamic_compiler_t mp_dynamic_compiler;
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#endif
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// These are the values for sched_state
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#define MP_SCHED_IDLE (1)
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#define MP_SCHED_LOCKED (-1)
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#define MP_SCHED_PENDING (0) // 0 so it's a quick check in the VM
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typedef struct _mp_sched_item_t {
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mp_obj_t func;
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mp_obj_t arg;
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} mp_sched_item_t;
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// This structure hold information about the memory allocation system.
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typedef struct _mp_state_mem_t {
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#if MICROPY_MEM_STATS
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size_t total_bytes_allocated;
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size_t current_bytes_allocated;
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size_t peak_bytes_allocated;
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#endif
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byte *gc_alloc_table_start;
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size_t gc_alloc_table_byte_len;
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#if MICROPY_ENABLE_FINALISER
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byte *gc_finaliser_table_start;
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#endif
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byte *gc_pool_start;
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byte *gc_pool_end;
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int gc_stack_overflow;
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MICROPY_GC_STACK_ENTRY_TYPE gc_stack[MICROPY_ALLOC_GC_STACK_SIZE];
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// This variable controls auto garbage collection. If set to 0 then the
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// GC won't automatically run when gc_alloc can't find enough blocks. But
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// you can still allocate/free memory and also explicitly call gc_collect.
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uint16_t gc_auto_collect_enabled;
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#if MICROPY_GC_ALLOC_THRESHOLD
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size_t gc_alloc_amount;
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size_t gc_alloc_threshold;
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#endif
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size_t gc_last_free_atb_index;
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#if MICROPY_PY_GC_COLLECT_RETVAL
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size_t gc_collected;
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#endif
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#if MICROPY_PY_THREAD && !MICROPY_PY_THREAD_GIL
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// This is a global mutex used to make the GC thread-safe.
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mp_thread_mutex_t gc_mutex;
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#endif
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} mp_state_mem_t;
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// This structure hold runtime and VM information. It includes a section
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// which contains root pointers that must be scanned by the GC.
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typedef struct _mp_state_vm_t {
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//
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// CONTINUE ROOT POINTER SECTION
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// This must start at the start of this structure and follows
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// the state in the mp_state_thread_t structure, continuing
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// the root pointer section from there.
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//
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qstr_pool_t *last_pool;
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#if MICROPY_TRACKED_ALLOC
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struct _m_tracked_node_t *m_tracked_head;
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#endif
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// non-heap memory for creating an exception if we can't allocate RAM
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mp_obj_exception_t mp_emergency_exception_obj;
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// memory for exception arguments if we can't allocate RAM
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#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF
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#if MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE > 0
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// statically allocated buf (needs to be aligned to mp_obj_t)
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mp_obj_t mp_emergency_exception_buf[MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE / sizeof(mp_obj_t)];
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#else
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// dynamically allocated buf
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byte *mp_emergency_exception_buf;
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#endif
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#endif
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#if MICROPY_KBD_EXCEPTION
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// exception object of type KeyboardInterrupt
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mp_obj_exception_t mp_kbd_exception;
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#endif
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// dictionary with loaded modules (may be exposed as sys.modules)
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mp_obj_dict_t mp_loaded_modules_dict;
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// dictionary for the __main__ module
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mp_obj_dict_t dict_main;
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// dictionary for overridden builtins
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#if MICROPY_CAN_OVERRIDE_BUILTINS
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mp_obj_dict_t *mp_module_builtins_override_dict;
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#endif
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// Include any root pointers registered with MP_REGISTER_ROOT_POINTER().
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#ifndef NO_QSTR
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// Only include root pointer definitions when not doing qstr extraction, because
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// the qstr extraction stage also generates the root pointers header file.
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#include "genhdr/root_pointers.h"
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#endif
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//
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// END ROOT POINTER SECTION
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////////////////////////////////////////////////////////////
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// pointer and sizes to store interned string data
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// (qstr_last_chunk can be root pointer but is also stored in qstr pool)
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char *qstr_last_chunk;
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size_t qstr_last_alloc;
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size_t qstr_last_used;
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#if MICROPY_PY_THREAD && !MICROPY_PY_THREAD_GIL
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// This is a global mutex used to make qstr interning thread-safe.
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mp_thread_mutex_t qstr_mutex;
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#endif
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#if MICROPY_ENABLE_COMPILER
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mp_uint_t mp_optimise_value;
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#if MICROPY_EMIT_NATIVE
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uint8_t default_emit_opt; // one of MP_EMIT_OPT_xxx
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#endif
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#endif
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// size of the emergency exception buf, if it's dynamically allocated
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#if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF && MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE == 0
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mp_int_t mp_emergency_exception_buf_size;
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#endif
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#if MICROPY_ENABLE_SCHEDULER
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volatile int16_t sched_state;
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#if MICROPY_SCHEDULER_STATIC_NODES
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// These will usually point to statically allocated memory. They are not
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// traced by the GC. They are assumed to be zero'd out before mp_init() is
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// called (usually because this struct lives in the BSS).
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struct _mp_sched_node_t *sched_head;
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struct _mp_sched_node_t *sched_tail;
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#endif
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// These index sched_queue.
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uint8_t sched_len;
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uint8_t sched_idx;
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#endif
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#if MICROPY_PY_THREAD_GIL
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// This is a global mutex used to make the VM/runtime thread-safe.
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mp_thread_mutex_t gil_mutex;
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#endif
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#if MICROPY_OPT_MAP_LOOKUP_CACHE
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// See mp_map_lookup.
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uint8_t map_lookup_cache[MICROPY_OPT_MAP_LOOKUP_CACHE_SIZE];
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#endif
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} mp_state_vm_t;
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// This structure holds state that is specific to a given thread.
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// Everything in this structure is scanned for root pointers.
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typedef struct _mp_state_thread_t {
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// Stack top at the start of program
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char *stack_top;
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#if MICROPY_STACK_CHECK
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size_t stack_limit;
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#endif
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#if MICROPY_ENABLE_PYSTACK
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uint8_t *pystack_start;
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uint8_t *pystack_end;
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uint8_t *pystack_cur;
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#endif
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// Locking of the GC is done per thread.
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uint16_t gc_lock_depth;
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////////////////////////////////////////////////////////////
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// START ROOT POINTER SECTION
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// Everything that needs GC scanning must start here, and
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// is followed by state in the mp_state_vm_t structure.
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//
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mp_obj_dict_t *dict_locals;
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mp_obj_dict_t *dict_globals;
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nlr_buf_t *nlr_top;
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// pending exception object (MP_OBJ_NULL if not pending)
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volatile mp_obj_t mp_pending_exception;
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// If MP_OBJ_STOP_ITERATION is propagated then this holds its argument.
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mp_obj_t stop_iteration_arg;
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#if MICROPY_PY_SYS_SETTRACE
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mp_obj_t prof_trace_callback;
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bool prof_callback_is_executing;
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struct _mp_code_state_t *current_code_state;
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#endif
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} mp_state_thread_t;
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// This structure combines the above 3 structures.
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// The order of the entries are important for root pointer scanning in the GC to work.
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typedef struct _mp_state_ctx_t {
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mp_state_thread_t thread;
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mp_state_vm_t vm;
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mp_state_mem_t mem;
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} mp_state_ctx_t;
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extern mp_state_ctx_t mp_state_ctx;
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#define MP_STATE_VM(x) (mp_state_ctx.vm.x)
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#define MP_STATE_MEM(x) (mp_state_ctx.mem.x)
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#define MP_STATE_MAIN_THREAD(x) (mp_state_ctx.thread.x)
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#if MICROPY_PY_THREAD
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extern mp_state_thread_t *mp_thread_get_state(void);
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#define MP_STATE_THREAD(x) (mp_thread_get_state()->x)
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#else
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#define MP_STATE_THREAD(x) MP_STATE_MAIN_THREAD(x)
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#endif
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#endif // MICROPY_INCLUDED_PY_MPSTATE_H
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