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#ifndef GC_HEADER_H 
#define GC_HEADER_H 
 
#include "pike_memory.h" 
#include "global.h" 
 
/* Note: Keep in sync to struct marker below */ 
#ifdef PIKE_DEBUG 
# define DEBUG_GC_MARKER_MEMBERS      \ 
        INT32 xrefs;                  \ 
        INT32 saved_refs;             \ 
        unsigned INT32 gc_flags 
#else 
# define DEBUG_GC_MARKER_MEMBERS      \ 
        unsigned INT16 gc_flags 
#endif 
 
#define GC_MARKER_MEMBERS             \ 
        INT32 refs;                   \ 
        INT32 gc_refs;                \ 
        struct gc_rec_frame *frame;   \ 
        INT32 weak_refs;              \ 
        unsigned INT16 gc_generation; \ 
        DEBUG_GC_MARKER_MEMBERS 
 
/* Note: Keep in sync to GC_MARKER_MEMBERS above */ 
struct marker 
{ 
  /* this should not be modified through a struct marker pointer */ 
  INT32 refs_do_not_touch; 
  INT32 gc_refs; 
  struct gc_rec_frame *frame;       /* Pointer to the cycle check rec frame. */ 
  /* Internal references (both weak and nonweak). Increased during 
   * check pass. */ 
  INT32 weak_refs; 
  /* Weak (implying internal) references. Increased during check pass. 
   * Set to -1 during check pass if it reaches the total number of 
   * references. Set to 0 during mark pass if a nonweak reference is 
   * found. Decreased during zap weak pass as gc_do_weak_free() is 
   * called. */ 
  unsigned INT16 gc_generation; 
#ifdef PIKE_DEBUG 
  INT32 xrefs; 
  /* Known external references. Increased by gc_mark_external(). */ 
  INT32 saved_refs; 
  /* References at beginning of gc. Set by pretouch and check passes. 
   * Decreased by gc_do_weak_free() as weak references are removed. */ 
  unsigned INT32 gc_flags; 
#else 
  unsigned INT16 gc_flags; 
#endif 
}; 
 
#ifdef PIKE_DEBUG 
#define GC_HEADER_INIT(REFS) (REFS), 0, NULL, 0, 0, 0, -1, 0 
#else 
#define GC_HEADER_INIT(REFS) (REFS), 0, NULL, 0, 0, 0 
#endif 
 
static inline void gc_init_marker(void *ptr) { 
    struct marker *m = ptr; 
    m->gc_refs = 0; 
    m->frame = NULL; 
    m->weak_refs = 0; 
    m->gc_generation = 0; 
#ifdef PIKE_DEBUG 
    m->xrefs = 0; 
    m->saved_refs = -1; 
#endif 
    m->gc_flags = 0; 
} 
 
#endif