/* classes: h_files */
-#ifndef GCH
-#define GCH
-/* Copyright (C) 1995, 96, 98, 99, 2000 Free Software Foundation, Inc.
- *
+#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,
\f
#include "libguile/__scm.h"
+
+#include "libguile/hooks.h"
+
\f
-#define SCM_FREEP(x) (SCM_NIMP(x) && SCM_UNPACK_CAR (x)==scm_tc_free_cell)
-#define SCM_NFREEP(x) (!SCM_FREEP(x))
+typedef struct scm_cell
+{
+ scm_bits_t word_0;
+ scm_bits_t word_1;
+} scm_cell;
+
+
+/* SCM_CELLPTR is a pointer to a cons cell which may be compared or
+ * differenced.
+ */
+typedef scm_cell * SCM_CELLPTR;
+
+
+/* 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_cell,
+ * pointers to scm_vector elts, functions, &c are not munged.
+ */
+#ifdef _UNICOS
+# define SCM2PTR(x) ((SCM_CELLPTR) (SCM_UNPACK (x) >> 3))
+# define PTR2SCM(x) (SCM_PACK (((scm_bits_t) (x)) << 3))
+#else
+# define SCM2PTR(x) ((SCM_CELLPTR) (SCM_UNPACK (x)))
+# define PTR2SCM(x) (SCM_PACK ((scm_bits_t) (x)))
+#endif /* def _UNICOS */
+
+#define SCM_GC_CARD_N_HEADER_CELLS 1
+#define SCM_GC_CARD_N_CELLS 256
+
+#define SCM_GC_CARD_SIZE (SCM_GC_CARD_N_CELLS * sizeof (scm_cell))
+#define SCM_GC_CARD_N_DATA_CELLS (SCM_GC_CARD_N_CELLS - SCM_GC_CARD_N_HEADER_CELLS)
+
+#define SCM_GC_CARD_BVEC_SIZE_IN_LIMBS \
+ ((SCM_GC_CARD_N_CELLS + SCM_C_BVEC_LIMB_BITS - 1) / SCM_C_BVEC_LIMB_BITS)
+
+#define SCM_GC_IN_CARD_HEADERP(x) \
+ SCM_PTR_LT ((scm_cell *) (x), SCM_GC_CELL_CARD (x) + SCM_GC_CARD_N_HEADER_CELLS)
+
+#define SCM_GC_CARD_BVEC(card) ((scm_c_bvec_limb_t *) ((card)->word_0))
+#define SCM_GC_SET_CARD_BVEC(card, bvec) \
+ ((card)->word_0 = (scm_bits_t) (bvec))
+
+#define SCM_GC_GET_CARD_FLAGS(card) ((long) ((card)->word_1))
+#define SCM_GC_SET_CARD_FLAGS(card, flags) \
+ ((card)->word_1 = (scm_bits_t) (flags))
+#define SCM_GC_CLR_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_CLR_CARD_FLAG(card, shift) \
+ (SCM_GC_SET_CARD_FLAGS (card, SCM_GC_GET_CARD_FLAGS(card) & ~(1L << (shift))))
+
+#define SCM_GC_CARDF_DOUBLECELL 0
+
+#define SCM_GC_CARD_DOUBLECELLP(card) SCM_GC_GET_CARD_FLAG (card, SCM_GC_CARDF_DOUBLECELL)
+#define SCM_GC_SET_CARD_DOUBLECELL(card) SCM_GC_SET_CARD_FLAG (card, SCM_GC_CARDF_DOUBLECELL)
+
+/* card addressing. for efficiency, cards are *always* aligned to
+ SCM_GC_CARD_SIZE. */
+
+#define SCM_GC_CARD_SIZE_MASK (SCM_GC_CARD_SIZE - 1)
+#define SCM_GC_CARD_ADDR_MASK (~SCM_GC_CARD_SIZE_MASK)
+
+#define SCM_GC_CELL_CARD(x) ((SCM_CELLPTR) ((long) (x) & SCM_GC_CARD_ADDR_MASK))
+#define SCM_GC_CELL_SPAN(x) ((SCM_GC_CARD_DOUBLECELLP (SCM_GC_CELL_CARD (x))) ? 2 : 1)
+#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_CLR_BIT(x) SCM_C_BVEC_CLR (SCM_GC_CELL_BVEC (x), SCM_GC_CELL_OFFSET (x))
+
+#define SCM_GC_CARD_UP(x) SCM_GC_CELL_CARD ((char *) (x) + SCM_GC_CARD_SIZE - 1)
+#define SCM_GC_CARD_DOWN SCM_GC_CELL_CARD
+
+/* low level bit banging aids */
+
+typedef unsigned long scm_c_bvec_limb_t;
+
+#if (SIZEOF_LONG == 8)
+# define SCM_C_BVEC_LIMB_BITS 64
+# define SCM_C_BVEC_OFFSET_SHIFT 6
+# define SCM_C_BVEC_POS_MASK 63
+# define SCM_CELL_SIZE_SHIFT 4
+#else
+# define SCM_C_BVEC_LIMB_BITS 32
+# 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_CLR(bvec, pos) (bvec[SCM_C_BVEC_OFFSET (pos)] &= ~(1L << (pos & SCM_C_BVEC_POS_MASK)))
+
+#define SCM_C_BVEC_BITS2BYTES(bits) \
+ (sizeof (scm_c_bvec_limb_t) * ((((bits) & SCM_C_BVEC_POS_MASK) ? 1L : 0L) + SCM_C_BVEC_OFFSET (bits)))
+
+#define SCM_C_BVEC_SET_BYTES(bvec, bytes) (memset (bvec, 0xff, bytes))
+#define SCM_C_BVEC_SET_ALL_BITS(bvec, bits) SCM_C_BVEC_SET_BYTES (bvec, SCM_C_BVEC_BITS2BYTES (bits))
+
+#define SCM_C_BVEC_CLR_BYTES(bvec, bytes) (memset (bvec, 0, bytes))
+#define SCM_C_BVEC_CLR_ALL_BITS(bvec, bits) SCM_C_BVEC_CLR_BYTES (bvec, SCM_C_BVEC_BITS2BYTES (bits))
+
+/* testing and changing GC marks */
+
+#define SCM_GCMARKP(x) SCM_GC_CELL_GET_BIT (x)
+#define SCM_SETGCMARK(x) SCM_GC_CELL_SET_BIT (x)
+#define SCM_CLRGCMARK(x) SCM_GC_CELL_CLR_BIT (x)
+
+/* Low level cell data accessing 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), ((const scm_bits_t *) SCM2PTR (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_PACK (((const scm_bits_t *) SCM2PTR (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_bits_t *) SCM2PTR (x)) [n] = (scm_bits_t) (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_bits_t *) SCM2PTR (x)) [n] = SCM_UNPACK (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)
-/* 1. This shouldn't be used on immediates.
- 2. It thinks that subrs are always unmarked (harmless). */
-#define SCM_MARKEDP(x) ((SCM_UNPACK_CAR (x) & 5) == 5 \
- ? SCM_GC8MARKP(x) \
- : SCM_GCMARKP(x))
-#define SCM_NMARKEDP(x) (!SCM_MARKEDP(x))
-extern struct scm_heap_seg_data *scm_heap_table;
-extern int scm_n_heap_segs;
-extern int scm_take_stdin;
+/* Except for the garbage collector, no part of guile should ever run over a
+ * free cell. Thus, in debug mode the above macros report an error if they
+ * are applied to a free cell. Since the garbage collector is allowed to
+ * access free cells, it needs its own way to access cells which will not
+ * result in errors when in debug mode. */
+
+#define SCM_GC_CELL_TYPE(x) \
+ (((const scm_bits_t *) SCM2PTR (x)) [0])
+
+
+#define SCM_CELL_WORD_LOC(x, n) ((scm_bits_t *) & 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))
+
+
+/* SCM_PTR_LT and friends define how to compare two SCM_CELLPTRs (which may
+ * point to cells in different heap segments).
+ */
+#define SCM_PTR_LT(x, y) ((x) < (y))
+#define SCM_PTR_GT(x, y) (SCM_PTR_LT (y, x))
+#define SCM_PTR_LE(x, y) (!SCM_PTR_GT (x, y))
+#define SCM_PTR_GE(x, y) (!SCM_PTR_LT (x, y))
+
+
+/* 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.
+ */
+
+#define SCM_FREE_CELL_P(x) \
+ (!SCM_IMP (x) && (* (const scm_bits_t *) SCM2PTR (x) == scm_tc_free_cell))
+#define SCM_FREE_CELL_CDR(x) \
+ (SCM_PACK (((const scm_bits_t *) SCM2PTR (x)) [1]))
+#define SCM_SET_FREE_CELL_CDR(x, v) \
+ (((scm_bits_t *) SCM2PTR (x)) [1] = SCM_UNPACK (v))
+
+
+#if (SCM_DEBUG_CELL_ACCESSES == 1)
+# define SCM_GC_SET_ALLOCATED(x) \
+ (((scm_bits_t *) SCM2PTR (x)) [0] = scm_tc16_allocated)
+#else
+# define SCM_GC_SET_ALLOCATED(x)
+#endif
+
+#ifdef GUILE_DEBUG_FREELIST
+#define SCM_NEWCELL(_into) do { _into = scm_debug_newcell (); } while (0)
+#define SCM_NEWCELL2(_into) do { _into = scm_debug_newcell2 (); } while (0)
+#else
+/* When we introduce POSIX threads support, every thread will have
+ a freelist of its own. */
+#define SCM_NEWCELL(_into) \
+ do { \
+ if (SCM_NULLP (scm_freelist)) \
+ { \
+ _into = scm_gc_for_newcell (&scm_master_freelist, \
+ &scm_freelist); \
+ SCM_GC_SET_ALLOCATED (_into); \
+ } \
+ else \
+ { \
+ _into = scm_freelist; \
+ scm_freelist = SCM_FREE_CELL_CDR (scm_freelist); \
+ SCM_GC_SET_ALLOCATED (_into); \
+ } \
+ } while(0)
+#define SCM_NEWCELL2(_into) \
+ do { \
+ if (SCM_NULLP (scm_freelist2)) \
+ { \
+ _into = scm_gc_for_newcell (&scm_master_freelist2, \
+ &scm_freelist2); \
+ SCM_GC_SET_ALLOCATED (_into); \
+ } \
+ else \
+ { \
+ _into = scm_freelist2; \
+ scm_freelist2 = SCM_FREE_CELL_CDR (scm_freelist2); \
+ SCM_GC_SET_ALLOCATED (_into); \
+ } \
+ } while(0)
+#endif
+
+
+#define SCM_MARKEDP SCM_GCMARKP
+#define SCM_NMARKEDP(x) (!SCM_MARKEDP (x))
+
+#if (SCM_DEBUG_CELL_ACCESSES == 1)
+extern scm_bits_t scm_tc16_allocated;
+extern unsigned int scm_debug_cell_accesses_p;
+#endif
+
+extern struct scm_heap_seg_data_t *scm_heap_table;
+extern size_t scm_n_heap_segs;
extern int scm_block_gc;
extern int scm_gc_heap_lock;
+extern unsigned int scm_gc_running_p;
\f
-typedef struct scm_freelist_t {
- SCM cells;
-#ifdef GUILE_NEW_GC_SCHEME
- int n_objects;
- /* a list of freelists, each of size gc_trigger,
- except the last one which may be shorter */
- SCM clusters;
- SCM *clustertail;
- /* GC trigger */
- int triggeredp;
- /* trigger GC ? */
- int triggerp;
- /* minimum number of objects allocated before GC is triggered
- and cluster size. */
- int gc_trigger;
-#endif
- /* number of cells per object on this list */
- int span;
- /* number of collected cells during last GC */
- int collected;
- /* total number of cells in heap segments
- * belonging to this list.
- */
- int heap_size;
-} scm_freelist_t;
-
-extern unsigned long scm_heap_size;
+extern size_t scm_default_init_heap_size_1;
+extern int scm_default_min_yield_1;
+extern size_t scm_default_init_heap_size_2;
+extern int scm_default_min_yield_2;
+extern size_t scm_default_max_segment_size;
+
+extern size_t scm_max_segment_size;
extern SCM_CELLPTR scm_heap_org;
-#ifdef GUILE_NEW_GC_SCHEME
extern SCM scm_freelist;
-extern scm_freelist_t scm_master_freelist;
+extern struct scm_freelist_t scm_master_freelist;
extern SCM scm_freelist2;
-extern scm_freelist_t scm_master_freelist2;
-#else
-extern scm_freelist_t scm_freelist;
-extern scm_freelist_t scm_freelist2;
-#endif
+extern struct scm_freelist_t scm_master_freelist2;
extern unsigned long scm_gc_cells_collected;
+extern unsigned long scm_gc_yield;
extern unsigned long scm_gc_malloc_collected;
extern unsigned long scm_gc_ports_collected;
extern unsigned long scm_cells_allocated;
-extern long scm_mallocated;
+extern unsigned long scm_mallocated;
extern unsigned long scm_mtrigger;
-#ifdef GUILE_DEBUG_FREELIST
+extern SCM scm_after_gc_hook;
+
+extern scm_c_hook_t scm_before_gc_c_hook;
+extern scm_c_hook_t scm_before_mark_c_hook;
+extern scm_c_hook_t scm_before_sweep_c_hook;
+extern scm_c_hook_t scm_after_sweep_c_hook;
+extern scm_c_hook_t scm_after_gc_c_hook;
+
+#if defined (GUILE_DEBUG) || defined (GUILE_DEBUG_FREELIST)
extern SCM scm_map_free_list (void);
+extern SCM scm_free_list_length (void);
+#endif
+#ifdef GUILE_DEBUG_FREELIST
extern SCM scm_debug_newcell (void);
extern SCM scm_debug_newcell2 (void);
extern SCM scm_gc_set_debug_check_freelist_x (SCM flag);
\f
+#if (SCM_DEBUG_CELL_ACCESSES == 1)
+extern void scm_assert_cell_valid (SCM);
+extern SCM scm_set_debug_cell_accesses_x (SCM flag);
+#endif
extern SCM scm_object_address (SCM obj);
extern SCM scm_unhash_name (SCM name);
extern SCM scm_gc_stats (void);
-extern void scm_gc_start (const char *what);
-extern void scm_gc_end (void);
extern SCM scm_gc (void);
-extern void scm_gc_for_alloc (scm_freelist_t *freelistp);
-#ifdef GUILE_NEW_GC_SCHEME
-extern SCM scm_gc_for_newcell (scm_freelist_t *master, SCM *freelist);
-#else
-extern SCM scm_gc_for_newcell (scm_freelist_t *freelistp);
+extern void scm_gc_for_alloc (struct scm_freelist_t *freelist);
+extern SCM scm_gc_for_newcell (struct scm_freelist_t *master, SCM *freelist);
+#if 0
+extern void scm_alloc_cluster (struct scm_freelist_t *master);
#endif
extern void scm_igc (const char *what);
extern void scm_gc_mark (SCM p);
-extern void scm_mark_locations (SCM_STACKITEM x[], scm_sizet n);
+extern void scm_gc_mark_dependencies (SCM p);
+extern void scm_mark_locations (SCM_STACKITEM x[], unsigned long n);
extern int scm_cellp (SCM value);
extern void scm_gc_sweep (void);
-extern void * scm_must_malloc (scm_sizet len, const char *what);
+extern void * scm_must_malloc (size_t len, const char *what);
extern void * scm_must_realloc (void *where,
- scm_sizet olen, scm_sizet len,
+ size_t olen, size_t len,
const char *what);
+extern char *scm_must_strdup (const char *str);
+extern char *scm_must_strndup (const char *str, size_t n);
extern void scm_done_malloc (long size);
+extern void scm_done_free (long size);
extern void scm_must_free (void *obj);
-extern void scm_remember (SCM * ptr);
+extern void scm_remember_upto_here_1 (SCM obj);
+extern void scm_remember_upto_here_2 (SCM obj1, SCM obj2);
+extern void scm_remember_upto_here (SCM obj1, ...);
extern SCM scm_return_first (SCM elt, ...);
extern int scm_return_first_int (int x, ...);
extern SCM scm_permanent_object (SCM obj);
extern SCM scm_protect_object (SCM obj);
extern SCM scm_unprotect_object (SCM obj);
-#ifdef GUILE_NEW_GC_SCHEME
-extern int scm_init_storage (scm_sizet init_heap_size, int tp, int trig,
- scm_sizet init_heap2_size, int tp2, int trig2);
-#else
-extern int scm_init_storage (scm_sizet init_heap_size,
- scm_sizet init_heap2_size);
-#endif
+extern int scm_init_storage (void);
+extern void *scm_get_stack_base (void);
extern void scm_init_gc (void);
-#endif /* GCH */
+
+\f
+
+#if (SCM_DEBUG_DEPRECATED == 0)
+
+#define SCM_SETAND_CAR(x, y) \
+ (SCM_SETCAR ((x), SCM_PACK (SCM_UNPACK (SCM_CAR (x)) & (y))))
+#define SCM_SETOR_CAR(x, y)\
+ (SCM_SETCAR ((x), SCM_PACK (SCM_UNPACK (SCM_CAR (x)) | (y))))
+#define SCM_SETAND_CDR(x, y)\
+ (SCM_SETCDR ((x), SCM_PACK (SCM_UNPACK (SCM_CDR (x)) & (y))))
+#define SCM_SETOR_CDR(x, y)\
+ (SCM_SETCDR ((x), SCM_PACK (SCM_UNPACK (SCM_CDR (x)) | (y))))
+#define SCM_FREEP(x) (SCM_FREE_CELL_P (x))
+#define SCM_NFREEP(x) (!SCM_FREE_CELL_P (x))
+#define SCM_GC8MARKP(x) SCM_GCMARKP (x)
+#define SCM_SETGC8MARK(x) SCM_SETGCMARK (x)
+#define SCM_CLRGC8MARK(x) SCM_CLRGCMARK (x)
+#define SCM_GCTYP16(x) SCM_TYP16 (x)
+#define SCM_GCCDR(x) SCM_CDR (x)
+extern void scm_remember (SCM * ptr);
+
+#endif /* SCM_DEBUG_DEPRECATED == 0 */
+
+#endif /* SCM_GC_H */
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff