316 lines
9.7 KiB
C
316 lines
9.7 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) 2013, 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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "py/mpconfig.h"
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#include "py/misc.h"
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#include "py/mpstate.h"
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#if MICROPY_DEBUG_VERBOSE // print debugging info
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#define DEBUG_printf DEBUG_printf
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#else // don't print debugging info
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#define DEBUG_printf(...) (void)0
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#endif
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#if MICROPY_MEM_STATS
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#if !MICROPY_MALLOC_USES_ALLOCATED_SIZE
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#error MICROPY_MEM_STATS requires MICROPY_MALLOC_USES_ALLOCATED_SIZE
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#endif
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#define UPDATE_PEAK() { if (MP_STATE_MEM(current_bytes_allocated) > MP_STATE_MEM(peak_bytes_allocated)) MP_STATE_MEM(peak_bytes_allocated) = MP_STATE_MEM(current_bytes_allocated); }
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#endif
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#if MICROPY_ENABLE_GC
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#include "py/gc.h"
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// We redirect standard alloc functions to GC heap - just for the rest of
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// this module. In the rest of MicroPython source, system malloc can be
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// freely accessed - for interfacing with system and 3rd-party libs for
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// example. On the other hand, some (e.g. bare-metal) ports may use GC
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// heap as system heap, so, to avoid warnings, we do undef's first.
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#undef malloc
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#undef free
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#undef realloc
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#define malloc(b) gc_alloc((b), false)
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#define malloc_with_finaliser(b) gc_alloc((b), true)
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#define free gc_free
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#define realloc(ptr, n) gc_realloc(ptr, n, true)
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#define realloc_ext(ptr, n, mv) gc_realloc(ptr, n, mv)
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#else
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// GC is disabled. Use system malloc/realloc/free.
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#if MICROPY_ENABLE_FINALISER
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#error MICROPY_ENABLE_FINALISER requires MICROPY_ENABLE_GC
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#endif
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STATIC void *realloc_ext(void *ptr, size_t n_bytes, bool allow_move) {
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if (allow_move) {
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return realloc(ptr, n_bytes);
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} else {
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// We are asked to resize, but without moving the memory region pointed to
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// by ptr. Unless the underlying memory manager has special provision for
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// this behaviour there is nothing we can do except fail to resize.
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return NULL;
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}
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}
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#endif // MICROPY_ENABLE_GC
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void *m_malloc(size_t num_bytes) {
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void *ptr = malloc(num_bytes);
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if (ptr == NULL && num_bytes != 0) {
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m_malloc_fail(num_bytes);
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}
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#if MICROPY_MEM_STATS
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MP_STATE_MEM(total_bytes_allocated) += num_bytes;
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MP_STATE_MEM(current_bytes_allocated) += num_bytes;
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UPDATE_PEAK();
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#endif
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DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
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return ptr;
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}
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void *m_malloc_maybe(size_t num_bytes) {
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void *ptr = malloc(num_bytes);
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#if MICROPY_MEM_STATS
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MP_STATE_MEM(total_bytes_allocated) += num_bytes;
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MP_STATE_MEM(current_bytes_allocated) += num_bytes;
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UPDATE_PEAK();
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#endif
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DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
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return ptr;
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}
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#if MICROPY_ENABLE_FINALISER
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void *m_malloc_with_finaliser(size_t num_bytes) {
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void *ptr = malloc_with_finaliser(num_bytes);
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if (ptr == NULL && num_bytes != 0) {
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m_malloc_fail(num_bytes);
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}
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#if MICROPY_MEM_STATS
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MP_STATE_MEM(total_bytes_allocated) += num_bytes;
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MP_STATE_MEM(current_bytes_allocated) += num_bytes;
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UPDATE_PEAK();
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#endif
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DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
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return ptr;
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}
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#endif
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void *m_malloc0(size_t num_bytes) {
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void *ptr = m_malloc(num_bytes);
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// If this config is set then the GC clears all memory, so we don't need to.
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#if !MICROPY_GC_CONSERVATIVE_CLEAR
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memset(ptr, 0, num_bytes);
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#endif
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return ptr;
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}
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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void *m_realloc(void *ptr, size_t old_num_bytes, size_t new_num_bytes)
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#else
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void *m_realloc(void *ptr, size_t new_num_bytes)
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#endif
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{
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void *new_ptr = realloc(ptr, new_num_bytes);
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if (new_ptr == NULL && new_num_bytes != 0) {
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m_malloc_fail(new_num_bytes);
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}
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#if MICROPY_MEM_STATS
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// At first thought, "Total bytes allocated" should only grow,
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// after all, it's *total*. But consider for example 2K block
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// shrunk to 1K and then grown to 2K again. It's still 2K
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// allocated total. If we process only positive increments,
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// we'll count 3K.
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size_t diff = new_num_bytes - old_num_bytes;
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MP_STATE_MEM(total_bytes_allocated) += diff;
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MP_STATE_MEM(current_bytes_allocated) += diff;
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UPDATE_PEAK();
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#endif
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
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#else
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DEBUG_printf("realloc %p, %d : %p\n", ptr, new_num_bytes, new_ptr);
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#endif
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return new_ptr;
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}
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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void *m_realloc_maybe(void *ptr, size_t old_num_bytes, size_t new_num_bytes, bool allow_move)
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#else
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void *m_realloc_maybe(void *ptr, size_t new_num_bytes, bool allow_move)
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#endif
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{
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void *new_ptr = realloc_ext(ptr, new_num_bytes, allow_move);
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#if MICROPY_MEM_STATS
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// At first thought, "Total bytes allocated" should only grow,
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// after all, it's *total*. But consider for example 2K block
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// shrunk to 1K and then grown to 2K again. It's still 2K
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// allocated total. If we process only positive increments,
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// we'll count 3K.
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// Also, don't count failed reallocs.
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if (!(new_ptr == NULL && new_num_bytes != 0)) {
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size_t diff = new_num_bytes - old_num_bytes;
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MP_STATE_MEM(total_bytes_allocated) += diff;
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MP_STATE_MEM(current_bytes_allocated) += diff;
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UPDATE_PEAK();
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}
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#endif
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
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#else
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DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, new_num_bytes, new_ptr);
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#endif
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return new_ptr;
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}
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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void m_free(void *ptr, size_t num_bytes)
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#else
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void m_free(void *ptr)
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#endif
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{
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free(ptr);
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#if MICROPY_MEM_STATS
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MP_STATE_MEM(current_bytes_allocated) -= num_bytes;
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#endif
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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DEBUG_printf("free %p, %d\n", ptr, num_bytes);
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#else
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DEBUG_printf("free %p\n", ptr);
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#endif
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}
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#if MICROPY_TRACKED_ALLOC
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#define MICROPY_TRACKED_ALLOC_STORE_SIZE (!MICROPY_ENABLE_GC)
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typedef struct _m_tracked_node_t {
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struct _m_tracked_node_t *prev;
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struct _m_tracked_node_t *next;
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#if MICROPY_TRACKED_ALLOC_STORE_SIZE
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uintptr_t size;
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#endif
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uint8_t data[];
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} m_tracked_node_t;
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#if MICROPY_DEBUG_VERBOSE
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STATIC size_t m_tracked_count_links(size_t *nb) {
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m_tracked_node_t *node = MP_STATE_VM(m_tracked_head);
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size_t n = 0;
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*nb = 0;
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while (node != NULL) {
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++n;
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#if MICROPY_TRACKED_ALLOC_STORE_SIZE
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*nb += node->size;
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#else
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*nb += gc_nbytes(node);
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#endif
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node = node->next;
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}
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return n;
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}
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#endif
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void *m_tracked_calloc(size_t nmemb, size_t size) {
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m_tracked_node_t *node = m_malloc_maybe(sizeof(m_tracked_node_t) + nmemb * size);
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if (node == NULL) {
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return NULL;
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}
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#if MICROPY_DEBUG_VERBOSE
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size_t nb;
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size_t n = m_tracked_count_links(&nb);
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DEBUG_printf("m_tracked_calloc(%u, %u) -> (%u;%u) %p\n", (int)nmemb, (int)size, (int)n, (int)nb, node);
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#endif
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if (MP_STATE_VM(m_tracked_head) != NULL) {
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MP_STATE_VM(m_tracked_head)->prev = node;
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}
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node->prev = NULL;
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node->next = MP_STATE_VM(m_tracked_head);
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MP_STATE_VM(m_tracked_head) = node;
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#if MICROPY_TRACKED_ALLOC_STORE_SIZE
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node->size = nmemb * size;
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#endif
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#if !MICROPY_GC_CONSERVATIVE_CLEAR
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memset(&node->data[0], 0, nmemb * size);
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#endif
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return &node->data[0];
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}
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void m_tracked_free(void *ptr_in) {
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if (ptr_in == NULL) {
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return;
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}
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m_tracked_node_t *node = (m_tracked_node_t *)((uint8_t *)ptr_in - sizeof(m_tracked_node_t));
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#if MICROPY_DEBUG_VERBOSE
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size_t data_bytes;
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#if MICROPY_TRACKED_ALLOC_STORE_SIZE
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data_bytes = node->size;
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#else
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data_bytes = gc_nbytes(node);
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#endif
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size_t nb;
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size_t n = m_tracked_count_links(&nb);
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DEBUG_printf("m_tracked_free(%p, [%p, %p], nbytes=%u, links=%u;%u)\n", node, node->prev, node->next, (int)data_bytes, (int)n, (int)nb);
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#endif
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if (node->next != NULL) {
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node->next->prev = node->prev;
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}
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if (node->prev != NULL) {
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node->prev->next = node->next;
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} else {
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MP_STATE_VM(m_tracked_head) = node->next;
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}
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m_free(node
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#if MICROPY_MALLOC_USES_ALLOCATED_SIZE
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#if MICROPY_TRACKED_ALLOC_STORE_SIZE
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, node->size
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#else
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, gc_nbytes(node)
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#endif
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#endif
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);
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}
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#endif // MICROPY_TRACKED_ALLOC
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#if MICROPY_MEM_STATS
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size_t m_get_total_bytes_allocated(void) {
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return MP_STATE_MEM(total_bytes_allocated);
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}
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size_t m_get_current_bytes_allocated(void) {
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return MP_STATE_MEM(current_bytes_allocated);
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}
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size_t m_get_peak_bytes_allocated(void) {
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return MP_STATE_MEM(peak_bytes_allocated);
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}
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#endif
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