text: /*
   * 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 <stdint.h>
  
  #include "py/mpstate.h"
  #include "py/gc.h"
  #include "py/mpthread.h"
  #include "lib/utils/gchelper.h"
  #include "gccollect.h"
  #include "systick.h"
  
  void gc_collect(void) {
      // get current time, in case we want to time the GC
      #if 0
      uint32_t start = mp_hal_ticks_us();
      #endif
  
      // start the GC
      gc_collect_start();
  
      // get the registers and the sp
      uintptr_t regs[10];
      uintptr_t sp = gc_helper_get_regs_and_sp(regs);
  
      // trace the stack, including the registers (since they live on the stack in this function)
      gc_collect_root((void **)sp, ((uint32_t)MP_STATE_THREAD(stack_top) - sp) / sizeof(uint32_t));
  
      // trace root pointers from any threads
      #if MICROPY_PY_THREAD
      mp_thread_gc_others();
      #endif
  
      // end the GC
      gc_collect_end();
  
      #if 0
      // print GC info
      uint32_t ticks = mp_hal_ticks_us() - start;
      gc_info_t info;
      gc_info(&info);
      printf("GC@%lu %lums\n", start, ticks);
      printf(" " UINT_FMT " total\n", info.total);
      printf(" " UINT_FMT " : " UINT_FMT "\n", info.used, info.free);
      printf(" 1=" UINT_FMT " 2=" UINT_FMT " m=" UINT_FMT "\n", info.num_1block, info.num_2block, info.max_block);
      #endif
  }
  