path: root/libguile/gc.h

/* classes: h_files */

#ifndef SCM_GC_H
#define SCM_GC_H

/* Copyright (C) 1995,1996,1998,1999,2000,2001 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */



#include "libguile/__scm.h"

#include "libguile/hooks.h"



typedef struct scm_t_cell
{
  scm_t_bits word_0;
  scm_t_bits word_1;
} scm_t_cell;

/*
  CARDS

  A card is a small `page' of memory; it will be the unit for lazy
  sweeping, generations, etc. The first cell of a card contains a
  pointer to the mark bitvector, so that we can find the bitvector efficiently: we
  knock off some lowerorder bits.

  The size on a 32 bit machine is 256 cells = 2kb. The card 
*/



/* Cray machines have pointers that are incremented once for each word,
 * rather than each byte, the 3 most significant bits encode the byte
 * within the word.  The following macros deal with this by storing the
 * native Cray pointers like the ones that looks like scm expects.  This
 * is done for any pointers that might appear in the car of a scm_t_cell,
 * pointers to scm_vector elts, functions, &c are not munged.
 */
#ifdef _UNICOS
#  define SCM2PTR(x) ((scm_t_cell *) (SCM_UNPACK (x) >> 3))
#  define PTR2SCM(x) (SCM_PACK (((scm_t_bits) (x)) << 3))
#else
#  define SCM2PTR(x) ((scm_t_cell *) (SCM_UNPACK (x)))
#  define PTR2SCM(x) (SCM_PACK ((scm_t_bits) (x)))
#endif /* def _UNICOS */


#define SCM_GC_CARD_N_HEADER_CELLS 1
#define SCM_GC_CARD_N_CELLS        256
#define SCM_GC_SIZEOF_CARD 		SCM_GC_CARD_N_CELLS * sizeof (scm_t_cell)

#define SCM_GC_CARD_BVEC(card)  ((scm_t_c_bvec_long *) ((card)->word_0))
#define SCM_GC_SET_CARD_BVEC(card, bvec) \
    ((card)->word_0 = (scm_t_bits) (bvec))


#define SCM_GC_GET_CARD_FLAGS(card) ((long) ((card)->word_1))
#define SCM_GC_SET_CARD_FLAGS(card, flags) \
    ((card)->word_1 = (scm_t_bits) (flags))
#define SCM_GC_CLEAR_CARD_FLAGS(card) (SCM_GC_SET_CARD_FLAGS (card, 0L))

#define SCM_GC_GET_CARD_FLAG(card, shift) (SCM_GC_GET_CARD_FLAGS (card) & (1L << (shift)))
#define SCM_GC_SET_CARD_FLAG(card, shift) \
    (SCM_GC_SET_CARD_FLAGS (card, SCM_GC_GET_CARD_FLAGS(card) | (1L << (shift))))
#define SCM_GC_CLEAR_CARD_FLAG(card, shift) \
    (SCM_GC_SET_CARD_FLAGS (card, SCM_GC_GET_CARD_FLAGS(card) & ~(1L << (shift))))

/*
  Remove card flags. They hamper lazy initialization, and aren't used
  anyways.
 */

/* card addressing. for efficiency, cards are *always* aligned to
   SCM_GC_CARD_SIZE. */

#define SCM_GC_CARD_SIZE_MASK  (SCM_GC_CARD_N_CELLS * sizeof (scm_t_cell) - 1)
#define SCM_GC_CARD_ADDR_MASK  (~SCM_GC_CARD_SIZE_MASK)

#define SCM_GC_CELL_CARD(x)    ((scm_t_cell *) ((long) (x) & SCM_GC_CARD_ADDR_MASK))
#define SCM_GC_CELL_OFFSET(x)  (((long) (x) & SCM_GC_CARD_SIZE_MASK) >> SCM_CELL_SIZE_SHIFT)
#define SCM_GC_CELL_BVEC(x)    SCM_GC_CARD_BVEC (SCM_GC_CELL_CARD (x))
#define SCM_GC_CELL_GET_BIT(x) SCM_C_BVEC_GET (SCM_GC_CELL_BVEC (x), SCM_GC_CELL_OFFSET (x))
#define SCM_GC_CELL_SET_BIT(x) SCM_C_BVEC_SET (SCM_GC_CELL_BVEC (x), SCM_GC_CELL_OFFSET (x))
#define SCM_GC_CELL_CLEAR_BIT(x) SCM_C_BVEC_CLEAR (SCM_GC_CELL_BVEC (x), SCM_GC_CELL_OFFSET (x))

#define SCM_GC_CARD_UP(x)      SCM_GC_CELL_CARD ((char *) (x) + SCM_GC_SIZEOF_CARD - 1)
#define SCM_GC_CARD_DOWN       SCM_GC_CELL_CARD

/* low level bit banging aids */
typedef unsigned long scm_t_c_bvec_long;

#if (SIZEOF_LONG == 8)
#       define SCM_C_BVEC_LONG_BITS    64
#       define SCM_C_BVEC_OFFSET_SHIFT 6
#       define SCM_C_BVEC_POS_MASK     63
#       define SCM_CELL_SIZE_SHIFT     4
#	define SCM_SIZEOF_LONG SIZEOF_LONG
#else
#       define SCM_C_BVEC_LONG_BITS    32
#	define SCM_SIZEOF_LONG SIZEOF_LONG
#       define SCM_C_BVEC_OFFSET_SHIFT 5
#       define SCM_C_BVEC_POS_MASK     31
#       define SCM_CELL_SIZE_SHIFT     3
#endif

#define SCM_C_BVEC_OFFSET(pos) (pos >> SCM_C_BVEC_OFFSET_SHIFT)

#define SCM_C_BVEC_GET(bvec, pos) (bvec[SCM_C_BVEC_OFFSET (pos)] & (1L << (pos & SCM_C_BVEC_POS_MASK)))
#define SCM_C_BVEC_SET(bvec, pos) (bvec[SCM_C_BVEC_OFFSET (pos)] |= (1L << (pos & SCM_C_BVEC_POS_MASK)))
#define SCM_C_BVEC_CLEAR(bvec, pos) (bvec[SCM_C_BVEC_OFFSET (pos)] &= ~(1L << (pos & SCM_C_BVEC_POS_MASK)))

/* testing and changing GC marks */
#define SCM_GC_MARK_P(x)   SCM_GC_CELL_GET_BIT (x)
#define SCM_SET_GC_MARK(x) SCM_GC_CELL_SET_BIT (x)
#define SCM_CLEAR_GC_MARK(x) SCM_GC_CELL_CLEAR_BIT (x)

/* Low level cell data accessing macros.  These macros should only be used
 * from within code related to garbage collection issues, since they will
 * never check the cells they are applied to - not even if guile is compiled
 * in debug mode.  In particular these macros will even work for free cells,
 * which should never be encountered by user code.  */

#define SCM_GC_CELL_WORD(x, n) \
  (((const scm_t_bits *) SCM2PTR (x)) [n])
#define SCM_GC_CELL_OBJECT(x, n) \
  (SCM_PACK (((const scm_t_bits *) SCM2PTR (x)) [n]))
#define SCM_GC_SET_CELL_WORD(x, n, v) \
  (((scm_t_bits *) SCM2PTR (x)) [n] = (scm_t_bits) (v))
#define SCM_GC_SET_CELL_OBJECT(x, n, v) \
 (((scm_t_bits *) SCM2PTR (x)) [n] = SCM_UNPACK (v))
#define SCM_GC_CELL_TYPE(x) SCM_GC_CELL_WORD (x, 0)


/* Except for the garbage collector, no part of guile should ever run over a
 * free cell.  Thus, if guile is compiled in debug mode the SCM_CELL_* and
 * SCM_SET_CELL_* macros below report an error if they are applied to a free
 * cell.  Some other plausibility checks are also performed.  However, if
 * guile is not compiled in debug mode, there won't be any time penalty at all
 * when using these macros.  */

#if (SCM_DEBUG_CELL_ACCESSES == 1)
#  define SCM_VALIDATE_CELL(cell, expr) (scm_assert_cell_valid (cell), (expr))
#else
#  define SCM_VALIDATE_CELL(cell, expr) (expr)
#endif

#define SCM_CELL_WORD(x, n) \
  SCM_VALIDATE_CELL ((x), SCM_GC_CELL_WORD ((x), (n)))
#define SCM_CELL_WORD_0(x) SCM_CELL_WORD (x, 0)
#define SCM_CELL_WORD_1(x) SCM_CELL_WORD (x, 1)
#define SCM_CELL_WORD_2(x) SCM_CELL_WORD (x, 2)
#define SCM_CELL_WORD_3(x) SCM_CELL_WORD (x, 3)

#define SCM_CELL_OBJECT(x, n) \
  SCM_VALIDATE_CELL ((x), SCM_GC_CELL_OBJECT ((x), (n)))
#define SCM_CELL_OBJECT_0(x) SCM_CELL_OBJECT (x, 0)
#define SCM_CELL_OBJECT_1(x) SCM_CELL_OBJECT (x, 1)
#define SCM_CELL_OBJECT_2(x) SCM_CELL_OBJECT (x, 2)
#define SCM_CELL_OBJECT_3(x) SCM_CELL_OBJECT (x, 3)

#define SCM_SET_CELL_WORD(x, n, v) \
  SCM_VALIDATE_CELL ((x), SCM_GC_SET_CELL_WORD ((x), (n), (v)))
#define SCM_SET_CELL_WORD_0(x, v) SCM_SET_CELL_WORD (x, 0, v)
#define SCM_SET_CELL_WORD_1(x, v) SCM_SET_CELL_WORD (x, 1, v)
#define SCM_SET_CELL_WORD_2(x, v) SCM_SET_CELL_WORD (x, 2, v)
#define SCM_SET_CELL_WORD_3(x, v) SCM_SET_CELL_WORD (x, 3, v)

#define SCM_SET_CELL_OBJECT(x, n, v) \
  SCM_VALIDATE_CELL ((x), SCM_GC_SET_CELL_OBJECT ((x), (n), (v)))
#define SCM_SET_CELL_OBJECT_0(x, v) SCM_SET_CELL_OBJECT (x, 0, v)
#define SCM_SET_CELL_OBJECT_1(x, v) SCM_SET_CELL_OBJECT (x, 1, v)
#define SCM_SET_CELL_OBJECT_2(x, v) SCM_SET_CELL_OBJECT (x, 2, v)
#define SCM_SET_CELL_OBJECT_3(x, v) SCM_SET_CELL_OBJECT (x, 3, v)

#define SCM_CELL_TYPE(x) SCM_CELL_WORD_0 (x)
#define SCM_SET_CELL_TYPE(x, t) SCM_SET_CELL_WORD_0 (x, t)



/* Freelists consist of linked cells where the type entry holds the value
 * scm_tc_free_cell and the second entry holds a pointer to the next cell of
 * the freelist.  Due to this structure, freelist cells are not cons cells
 * and thus may not be accessed using SCM_CAR and SCM_CDR.  */

/*
  SCM_FREECELL_P removed ; the semantics are ambiguous with lazy
  sweeping. Could mean "this cell is no longer in use (will be swept)"
  or "this cell has just been swept, and is not yet in use".
 */

#define SCM_FREECELL_P  this_macro_has_been_removed_see_gc_header_file

#define SCM_FREE_CELL_CDR(x) \
  (SCM_GC_CELL_OBJECT ((x), 1))
#define SCM_SET_FREE_CELL_CDR(x, v) \
  (SCM_GC_SET_CELL_OBJECT ((x), 1, (v)))


#define SCM_CELL_WORD_LOC(x, n) ((scm_t_bits *) & SCM_CELL_WORD (x, n))
#define SCM_CARLOC(x) ((SCM *) SCM_CELL_WORD_LOC ((x), 0))
#define SCM_CDRLOC(x) ((SCM *) SCM_CELL_WORD_LOC ((x), 1))




#if (SCM_DEBUG_CELL_ACCESSES == 1)
/* Set this to != 0 if every cell that is accessed shall be checked:
 */
SCM_API int scm_debug_cell_accesses_p;
SCM_API int scm_expensive_debug_cell_accesses_p;
SCM_API int scm_debug_cells_gc_interval ;
void scm_i_expensive_validation_check (SCM cell);
#endif

SCM_API int scm_block_gc;
SCM_API int scm_gc_heap_lock;
SCM_API unsigned int scm_gc_running_p;


#if (SCM_ENABLE_DEPRECATED == 1)
SCM_API size_t scm_default_init_heap_size_1;
SCM_API int scm_default_min_yield_1;
SCM_API size_t scm_default_init_heap_size_2;
SCM_API int scm_default_min_yield_2;
SCM_API size_t scm_default_max_segment_size;
#else
#define  scm_default_init_heap_size_1 deprecated
#define  scm_default_min_yield_1 deprecated
#define  scm_default_init_heap_size_2 deprecated
#define  scm_default_min_yield_2 deprecated
#define  scm_default_max_segment_size deprecated
#endif


SCM_API size_t scm_max_segment_size;

/*
  Deprecated scm_freelist, scm_master_freelist.
  No warning; this is not a user serviceable part.
 */
extern SCM scm_i_freelist;
extern struct scm_t_cell_type_statistics scm_i_master_freelist;
extern SCM scm_i_freelist2;
extern struct scm_t_cell_type_statistics scm_i_master_freelist2;


SCM_API unsigned long scm_gc_cells_swept;
SCM_API unsigned long scm_gc_cells_collected;
SCM_API unsigned long scm_gc_cells_collected;
SCM_API unsigned long scm_gc_malloc_collected;
SCM_API unsigned long scm_gc_ports_collected;
SCM_API unsigned long scm_cells_allocated;
SCM_API int scm_gc_cell_yield_percentage;
SCM_API int scm_gc_malloc_yield_percentage;
SCM_API unsigned long scm_mallocated;
SCM_API unsigned long scm_mtrigger;



SCM_API SCM scm_after_gc_hook;

SCM_API scm_t_c_hook scm_before_gc_c_hook;
SCM_API scm_t_c_hook scm_before_mark_c_hook;
SCM_API scm_t_c_hook scm_before_sweep_c_hook;
SCM_API scm_t_c_hook scm_after_sweep_c_hook;
SCM_API scm_t_c_hook scm_after_gc_c_hook;

#if defined (GUILE_DEBUG) || defined (GUILE_DEBUG_FREELIST)
#define scm_map_free_list deprecated
#define scm_free_list_length deprecated
#endif

#if (SCM_ENABLE_DEPRECATED == 1) && defined (GUILE_DEBUG_FREELIST)
SCM_API SCM scm_gc_set_debug_check_freelist_x (SCM flag);
#endif


#if (SCM_DEBUG_CELL_ACCESSES == 1)
SCM_API void scm_assert_cell_valid (SCM);
#endif

SCM_API SCM scm_set_debug_cell_accesses_x (SCM flag);


SCM_API SCM scm_object_address (SCM obj);
SCM_API SCM scm_gc_stats (void);
SCM_API SCM scm_gc (void);
SCM_API void scm_gc_for_alloc (struct scm_t_cell_type_statistics *freelist);
SCM_API SCM scm_gc_for_newcell (struct scm_t_cell_type_statistics *master, SCM *freelist);
SCM_API void scm_igc (const char *what);
SCM_API void scm_gc_mark (SCM p);
SCM_API void scm_gc_mark_dependencies (SCM p);
SCM_API void scm_mark_locations (SCM_STACKITEM x[], unsigned long n);
SCM_API int scm_in_heap_p (SCM value);
SCM_API void scm_gc_sweep (void);

SCM_API void *scm_malloc (size_t size);
SCM_API void *scm_calloc (size_t size);
SCM_API void *scm_realloc (void *mem, size_t size);
SCM_API char *scm_strdup (const char *str);
SCM_API char *scm_strndup (const char *str, size_t n);
SCM_API void scm_gc_register_collectable_memory (void *mem, size_t size,
						 const char *what);
SCM_API void scm_gc_unregister_collectable_memory (void *mem, size_t size,
						   const char *what);
SCM_API void *scm_gc_calloc (size_t size, const char *what);
SCM_API void *scm_gc_malloc (size_t size, const char *what);
SCM_API void *scm_gc_realloc (void *mem, size_t old_size, 
			      size_t new_size, const char *what);
SCM_API void scm_gc_free (void *mem, size_t size, const char *what);
SCM_API char *scm_gc_strdup (const char *str, const char *what);
SCM_API char *scm_gc_strndup (const char *str, size_t n, const char *what);

SCM_API void scm_remember_upto_here_1 (SCM obj);
SCM_API void scm_remember_upto_here_2 (SCM obj1, SCM obj2);
SCM_API void scm_remember_upto_here (SCM obj1, ...);
SCM_API SCM scm_return_first (SCM elt, ...);
SCM_API int scm_return_first_int (int x, ...);
SCM_API SCM scm_permanent_object (SCM obj);
SCM_API SCM scm_gc_protect_object (SCM obj);
SCM_API SCM scm_gc_unprotect_object (SCM obj);
SCM_API void scm_gc_register_root (SCM *p);
SCM_API void scm_gc_unregister_root (SCM *p);
SCM_API void scm_gc_register_roots (SCM *b, unsigned long n);
SCM_API void scm_gc_unregister_roots (SCM *b, unsigned long n);
SCM_API int scm_init_storage (void);
SCM_API void *scm_get_stack_base (void);
SCM_API void scm_init_gc (void);

#if SCM_ENABLE_DEPRECATED == 1

SCM_API SCM scm_deprecated_newcell (void);
SCM_API SCM scm_deprecated_newcell2 (void);

#define SCM_NEWCELL(_into) \
  do { _into = scm_deprecated_newcell (); } while (0)
#define SCM_NEWCELL2(_into) \
  do { _into = scm_deprecated_newcell2 (); } while (0)

SCM_API void * scm_must_malloc (size_t len, const char *what);
SCM_API void * scm_must_realloc (void *where,
				 size_t olen, size_t len,
				 const char *what);
SCM_API char *scm_must_strdup (const char *str);
SCM_API char *scm_must_strndup (const char *str, size_t n);
SCM_API void scm_done_malloc (long size);
SCM_API void scm_done_free (long size);
SCM_API void scm_must_free (void *obj);

#endif

#endif  /* SCM_GC_H */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/