text: /*
  * Copyright (c) 2019 Calvin Rose
  *
  * 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.
  */
  
  #ifndef JANET_GC_H
  #define JANET_GC_H
  
  #ifndef JANET_AMALG
  #include <janet.h>
  #endif
  
  /* The metadata header associated with an allocated block of memory */
  #define janet_gc_header(mem) ((JanetGCObject *)(mem))
  
  #define JANET_MEM_TYPEBITS 0xFF
  #define JANET_MEM_REACHABLE 0x100
  #define JANET_MEM_DISABLED 0x200
  
  #define janet_gc_settype(m, t) ((janet_gc_header(m)->flags |= (0xFF & (t))))
  #define janet_gc_type(m) (janet_gc_header(m)->flags & 0xFF)
  
  #define janet_gc_mark(m) (janet_gc_header(m)->flags |= JANET_MEM_REACHABLE)
  #define janet_gc_reachable(m) (janet_gc_header(m)->flags & JANET_MEM_REACHABLE)
  
  /* Memory types for the GC. Different from JanetType to include funcenv and funcdef. */
  enum JanetMemoryType {
      JANET_MEMORY_NONE,
      JANET_MEMORY_STRING,
      JANET_MEMORY_SYMBOL,
      JANET_MEMORY_ARRAY,
      JANET_MEMORY_TUPLE,
      JANET_MEMORY_TABLE,
      JANET_MEMORY_STRUCT,
      JANET_MEMORY_FIBER,
      JANET_MEMORY_BUFFER,
      JANET_MEMORY_FUNCTION,
      JANET_MEMORY_ABSTRACT,
      JANET_MEMORY_FUNCENV,
      JANET_MEMORY_FUNCDEF
  };
  
  /* To allocate collectable memory, one must calk janet_alloc, initialize the memory,
   * and then call when janet_enablegc when it is initailize and reachable by the gc (on the JANET stack) */
  void *janet_gcalloc(enum JanetMemoryType type, size_t size);
  
  #endif
  