circuitpython/supervisor/memory.h

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
*
* 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.
*/
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// Basic allocations outside them for areas such as the VM heap and stack.
// supervisor/shared/memory.c has a basic implementation for a continuous chunk of memory. Add it
// to a SRC_ in a Makefile to use it.
#ifndef MICROPY_INCLUDED_SUPERVISOR_MEMORY_H
#define MICROPY_INCLUDED_SUPERVISOR_MEMORY_H
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
typedef struct {
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uint32_t *ptr;
} supervisor_allocation;
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void free_memory(supervisor_allocation *allocation);
// Find the allocation with the given ptr, NULL if not found. When called from the context of a
// supervisor_move_memory() callback, finds the allocation that had that ptr *before* the move, but
// the returned allocation already contains the ptr after the move.
// When called with NULL, may return either NULL or an unused allocation whose ptr is NULL (this is
// a feature used internally in allocate_memory to save code size). Passing the return value to
// free_memory() is a permissible no-op in either case.
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supervisor_allocation *allocation_from_ptr(void *ptr);
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supervisor_allocation *allocate_remaining_memory(void);
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// Allocate a piece of a given length in bytes. If high_address is true then it should be allocated
// at a lower address from the top of the stack. Otherwise, addresses will increase starting after
// statically allocated memory. If movable is false, memory will be taken from outside the GC heap
// and will stay stationary until freed. While the VM is running, this will fail unless a previous
// allocation of exactly matching length has recently been freed. If movable is true, memory will be
// taken from either outside or inside the GC heap, and when the VM exits, will be moved outside.
// The ptr of the returned supervisor_allocation will change at that point. If you need to be
// notified of that, add your own callback function at the designated place near the end of
// supervisor_move_memory().
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supervisor_allocation *allocate_memory(uint32_t length, bool high_address, bool movable);
static inline size_t align32_size(size_t size) {
return (size + 3) & ~3;
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}
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size_t get_allocation_length(supervisor_allocation *allocation);
// Called after the GC heap is freed, transfers movable allocations from the GC heap to the
// supervisor heap and compacts the supervisor heap.
void supervisor_move_memory(void);
#endif // MICROPY_INCLUDED_SUPERVISOR_MEMORY_H