/*
   * This file is part of the MicroPython 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 "py/mpconfig.h"
  #include "py/misc.h"
  #include "py/mpstate.h"
  
  #if MICROPY_DEBUG_VERBOSE // print debugging info
  #define DEBUG_printf DEBUG_printf
  #else // don't print debugging info
  #define DEBUG_printf(...) (void)0
  #endif
  
  #if MICROPY_MEM_STATS
  #if !MICROPY_MALLOC_USES_ALLOCATED_SIZE
  #error MICROPY_MEM_STATS requires MICROPY_MALLOC_USES_ALLOCATED_SIZE
  #endif
  #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); }
  #endif
  
  #if MICROPY_ENABLE_GC
  #include "py/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(ptr, n) gc_realloc(ptr, n, true)
  #define realloc_ext(ptr, n, mv) gc_realloc(ptr, n, mv)
  #else
  STATIC void *realloc_ext(void *ptr, size_t n_bytes, bool allow_move) {
      if (allow_move) {
          return realloc(ptr, n_bytes);
      } else {
          // We are asked to resize, but without moving the memory region pointed to
          // by ptr.  Unless the underlying memory manager has special provision for
          // this behaviour there is nothing we can do except fail to resize.
          return NULL;
      }
  }
  #endif // MICROPY_ENABLE_GC
  
  void *m_malloc(size_t num_bytes) {
      void *ptr = malloc(num_bytes);
      if (ptr == NULL && num_bytes != 0) {
          m_malloc_fail(num_bytes);
      }
  #if MICROPY_MEM_STATS
      MP_STATE_MEM(total_bytes_allocated) += num_bytes;
      MP_STATE_MEM(current_bytes_allocated) += num_bytes;
      UPDATE_PEAK();
  #endif
      DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
      return ptr;
  }
  
  void *m_malloc_maybe(size_t num_bytes) {
      void *ptr = malloc(num_bytes);
  #if MICROPY_MEM_STATS
      MP_STATE_MEM(total_bytes_allocated) += num_bytes;
      MP_STATE_MEM(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(size_t num_bytes) {
      void *ptr = malloc_with_finaliser(num_bytes);
      if (ptr == NULL && num_bytes != 0) {
          m_malloc_fail(num_bytes);
      }
  #if MICROPY_MEM_STATS
      MP_STATE_MEM(total_bytes_allocated) += num_bytes;
      MP_STATE_MEM(current_bytes_allocated) += num_bytes;
      UPDATE_PEAK();
  #endif
      DEBUG_printf("malloc %d : %p\n", num_bytes, ptr);
      return ptr;
  }
  #endif
  
  void *m_malloc0(size_t num_bytes) {
      void *ptr = m_malloc(num_bytes);
      // If this config is set then the GC clears all memory, so we don't need to.
      #if !MICROPY_GC_CONSERVATIVE_CLEAR
      memset(ptr, 0, num_bytes);
      #endif
      return ptr;
  }
  
  #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
  void *m_realloc(void *ptr, size_t old_num_bytes, size_t new_num_bytes) {
  #else
  void *m_realloc(void *ptr, size_t new_num_bytes) {
  #endif
      void *new_ptr = realloc(ptr, new_num_bytes);
      if (new_ptr == NULL && new_num_bytes != 0) {
          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.
      size_t diff = new_num_bytes - old_num_bytes;
      MP_STATE_MEM(total_bytes_allocated) += diff;
      MP_STATE_MEM(current_bytes_allocated) += diff;
      UPDATE_PEAK();
  #endif
      #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
      DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
      #else
      DEBUG_printf("realloc %p, %d : %p\n", ptr, new_num_bytes, new_ptr);
      #endif
      return new_ptr;
  }
  
  #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
  void *m_realloc_maybe(void *ptr, size_t old_num_bytes, size_t new_num_bytes, bool allow_move) {
  #else
  void *m_realloc_maybe(void *ptr, size_t new_num_bytes, bool allow_move) {
  #endif
      void *new_ptr = realloc_ext(ptr, new_num_bytes, allow_move);
  #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.
      // Also, don't count failed reallocs.
      if (!(new_ptr == NULL && new_num_bytes != 0)) {
          size_t diff = new_num_bytes - old_num_bytes;
          MP_STATE_MEM(total_bytes_allocated) += diff;
          MP_STATE_MEM(current_bytes_allocated) += diff;
          UPDATE_PEAK();
      }
  #endif
      #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
      DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, old_num_bytes, new_num_bytes, new_ptr);
      #else
      DEBUG_printf("realloc %p, %d, %d : %p\n", ptr, new_num_bytes, new_ptr);
      #endif
      return new_ptr;
  }
  
  #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
  void m_free(void *ptr, size_t num_bytes) {
  #else
  void m_free(void *ptr) {
  #endif
      free(ptr);
  #if MICROPY_MEM_STATS
      MP_STATE_MEM(current_bytes_allocated) -= num_bytes;
  #endif
      #if MICROPY_MALLOC_USES_ALLOCATED_SIZE
      DEBUG_printf("free %p, %d\n", ptr, num_bytes);
      #else
      DEBUG_printf("free %p\n", ptr);
      #endif
  }
  
  #if MICROPY_MEM_STATS
  size_t m_get_total_bytes_allocated(void) {
      return MP_STATE_MEM(total_bytes_allocated);
  }
  
  size_t m_get_current_bytes_allocated(void) {
      return MP_STATE_MEM(current_bytes_allocated);
  }
  
  size_t m_get_peak_bytes_allocated(void) {
      return MP_STATE_MEM(peak_bytes_allocated);
  }
  #endif