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modwebrepl.c

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  • malloc.c 5.71 KiB
    /*
     * This file is part of the Micro Python project, http://micropython.org/
     *
     * The MIT License (MIT)
     *
     * Copyright (c) 2013, 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.
     */
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    
    #include "misc.h"
    #include "mpconfig.h"
    
    #if 0 // print debugging info
    #define DEBUG_printf DEBUG_printf
    #else // don't print debugging info
    #define DEBUG_printf(...) (void)0
    #endif
    
    #if MICROPY_MEM_STATS
    STATIC int total_bytes_allocated = 0;
    STATIC int current_bytes_allocated = 0;
    STATIC int peak_bytes_allocated = 0;
    
    #define UPDATE_PEAK() { if (current_bytes_allocated > peak_bytes_allocated) peak_bytes_allocated = current_bytes_allocated; }
    #endif
    
    #if MICROPY_ENABLE_GC
    #include "gc.h"
    
    // We redirect standard alloc functions to GC heap - just for the rest of
    // this module. In the rest of micropython source, system malloc can be
    // freely accessed - for interfacing with system and 3rd-party libs for
    // example. On the other hand, some (e.g. bare-metal) ports may use GC
    // heap as system heap, so, to avoid warnings, we do undef's first.
    #undef malloc
    #undef free
    #undef realloc
    #define malloc(b) gc_alloc((b), false)
    #define malloc_with_finaliser(b) gc_alloc((b), true)
    #define free gc_free
    #define realloc gc_realloc
    #endif // MICROPY_ENABLE_GC
    
    void *m_malloc(int num_bytes) {
        if (num_bytes == 0) {
            return NULL;
        }
        void *ptr = malloc(num_bytes);
        if (ptr == NULL) {
            return m_malloc_fail(num_bytes);
        }
    #if MICROPY_MEM_STATS
        total_bytes_allocated += num_bytes;
        current_bytes_allocated += num_bytes;
        UPDATE_PEAK();
    #endif
        DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
        return ptr;
    }
    
    void *m_malloc_maybe(int num_bytes) {
        void *ptr = malloc(num_bytes);
        if (ptr == NULL) {
            return NULL;
        }
    #if MICROPY_MEM_STATS
        total_bytes_allocated += num_bytes;
        current_bytes_allocated += num_bytes;
        UPDATE_PEAK();
    #endif
        DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
        return ptr;
    }
    
    #if MICROPY_ENABLE_FINALISER
    void *m_malloc_with_finaliser(int num_bytes) {
        if (num_bytes == 0) {
            return NULL;
        }
        void *ptr = malloc_with_finaliser(num_bytes);
        if (ptr == NULL) {
            return m_malloc_fail(num_bytes);
        }
    #if MICROPY_MEM_STATS
        total_bytes_allocated += num_bytes;
        current_bytes_allocated += num_bytes;
        UPDATE_PEAK();
    #endif
        DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
        return ptr;
    }
    #endif
    
    void *m_malloc0(int num_bytes) {
        void *ptr = m_malloc(num_bytes);
        if (ptr != NULL) {
            memset(ptr, 0, num_bytes);
        }
        return ptr;
    }
    
    void *m_realloc(void *ptr, int old_num_bytes, int new_num_bytes) {
        if (new_num_bytes == 0) {
            free(ptr);
            return NULL;
        }
        void *new_ptr = realloc(ptr, new_num_bytes);
        if (new_ptr == NULL) {
            return m_malloc_fail(new_num_bytes);
        }
    #if MICROPY_MEM_STATS
        // At first thought, "Total bytes allocated" should only grow,
        // after all, it's *total*. But consider for example 2K block
        // shrunk to 1K and then grown to 2K again. It's still 2K
        // allocated total. If we process only positive increments,
        // we'll count 3K.
        int diff = new_num_bytes - old_num_bytes;
        total_bytes_allocated += diff;
        current_bytes_allocated += diff;
        UPDATE_PEAK();
    #endif
        DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
        return new_ptr;
    }
    
    void *m_realloc_maybe(void *ptr, int old_num_bytes, int new_num_bytes) {
        void *new_ptr = realloc(ptr, new_num_bytes);
        if (new_ptr == NULL) {
            return NULL;
        }
    #if MICROPY_MEM_STATS
        // At first thought, "Total bytes allocated" should only grow,
        // after all, it's *total*. But consider for example 2K block
        // shrunk to 1K and then grown to 2K again. It's still 2K
        // allocated total. If we process only positive increments,
        // we'll count 3K.
        int diff = new_num_bytes - old_num_bytes;
        total_bytes_allocated += diff;
        current_bytes_allocated += diff;
        UPDATE_PEAK();
    #endif
        DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
        return new_ptr;
    }
    
    void m_free(void *ptr, int num_bytes) {
        if (ptr != NULL) {
            free(ptr);
        }
    #if MICROPY_MEM_STATS
        current_bytes_allocated -= num_bytes;
    #endif
        DEBUG_printf("free %p, %d\n", ptr, num_bytes);
    }
    
    int m_get_total_bytes_allocated(void) {
    #if MICROPY_MEM_STATS
        return total_bytes_allocated;
    #else
        return -1;
    #endif
    }
    
    int m_get_current_bytes_allocated(void) {
    #if MICROPY_MEM_STATS
        return current_bytes_allocated;
    #else
        return -1;
    #endif
    }
    
    int m_get_peak_bytes_allocated(void) {
    #if MICROPY_MEM_STATS
        return peak_bytes_allocated;
    #else
        return -1;
    #endif
    }