1 /* Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004, 2006 Free Software Foundation, Inc.
3 * This library is free software; you can redistribute it and/or
4 * modify it under the terms of the GNU Lesser General Public
5 * License as published by the Free Software Foundation; either
6 * version 2.1 of the License, or (at your option) any later version.
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * Lesser General Public License for more details.
13 * You should have received a copy of the GNU Lesser General Public
14 * License along with this library; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libguile/_scm.h"
24 #include "libguile/async.h"
25 #include "libguile/chars.h"
26 #include "libguile/eval.h"
27 #include "libguile/alist.h"
28 #include "libguile/weaks.h"
29 #include "libguile/hashtab.h"
30 #include "libguile/ports.h"
31 #include "libguile/strings.h"
33 #include "libguile/validate.h"
34 #include "libguile/struct.h"
36 #include "libguile/eq.h"
46 static SCM required_vtable_fields
= SCM_BOOL_F
;
50 SCM_DEFINE (scm_make_struct_layout
, "make-struct-layout", 1, 0, 0,
52 "Return a new structure layout object.\n\n"
53 "@var{fields} must be a string made up of pairs of characters\n"
54 "strung together. The first character of each pair describes a field\n"
55 "type, the second a field protection. Allowed types are 'p' for\n"
56 "GC-protected Scheme data, 'u' for unprotected binary data, and 's' for\n"
57 "a field that points to the structure itself. Allowed protections\n"
58 "are 'w' for mutable fields, 'r' for read-only fields, and 'o' for opaque\n"
59 "fields. The last field protection specification may be capitalized to\n"
60 "indicate that the field is a tail-array.")
61 #define FUNC_NAME s_scm_make_struct_layout
64 SCM_VALIDATE_STRING (1, fields
);
67 const char * field_desc
;
71 len
= scm_i_string_length (fields
);
73 SCM_MISC_ERROR ("odd length field specification: ~S",
76 field_desc
= scm_i_string_chars (fields
);
78 for (x
= 0; x
< len
; x
+= 2)
80 switch (field_desc
[x
])
91 SCM_MISC_ERROR ("unrecognized field type: ~S",
92 scm_list_1 (SCM_MAKE_CHAR (field_desc
[x
])));
95 switch (field_desc
[x
+ 1])
98 if (field_desc
[x
] == 's')
99 SCM_MISC_ERROR ("self fields not writable", SCM_EOL
);
106 if (field_desc
[x
] == 's')
107 SCM_MISC_ERROR ("self fields not allowed in tail array",
110 SCM_MISC_ERROR ("tail array field must be last field in layout",
114 SCM_MISC_ERROR ("unrecognized ref specification: ~S",
115 scm_list_1 (SCM_MAKE_CHAR (field_desc
[x
+ 1])));
118 if (field_desc
[x
] == 'd')
120 if (field_desc
[x
+ 2] != '-')
121 SCM_MISC_ERROR ("missing dash field at position ~A",
122 scm_list_1 (scm_from_int (x
/ 2)));
128 new_sym
= scm_string_to_symbol (fields
);
130 scm_remember_upto_here_1 (fields
);
140 scm_struct_init (SCM handle
, SCM layout
, scm_t_bits
* mem
, int tail_elts
, SCM inits
)
142 unsigned const char *fields_desc
=
143 (unsigned const char *) scm_i_symbol_chars (layout
) - 2;
144 unsigned char prot
= 0;
145 int n_fields
= scm_i_symbol_length (layout
) / 2;
153 prot
= fields_desc
[1];
154 if (SCM_LAYOUT_TAILP (prot
))
157 prot
= prot
== 'R' ? 'r' : prot
== 'W' ? 'w' : 'o';
159 n_fields
+= tail_elts
- 1;
165 switch (*fields_desc
)
169 if ((prot
!= 'r' && prot
!= 'w') || inits
== SCM_EOL
)
173 *mem
= scm_to_long (SCM_CAR (inits
));
174 inits
= SCM_CDR (inits
);
180 if ((prot
!= 'r' && prot
!= 'w') || scm_is_null (inits
))
184 *mem
= scm_to_ulong (SCM_CAR (inits
));
185 inits
= SCM_CDR (inits
);
190 if ((prot
!= 'r' && prot
!= 'w') || scm_is_null (inits
))
191 *mem
= SCM_UNPACK (SCM_BOOL_F
);
194 *mem
= SCM_UNPACK (SCM_CAR (inits
));
195 inits
= SCM_CDR (inits
);
202 if ((prot
!= 'r' && prot
!= 'w') || inits
== SCM_EOL
)
203 *((double *)mem
) = 0.0;
206 *mem
= scm_num2dbl (SCM_CAR (inits
), "scm_struct_init");
207 inits
= SCM_CDR (inits
);
214 *mem
= SCM_UNPACK (handle
);
224 SCM_DEFINE (scm_struct_p
, "struct?", 1, 0, 0,
226 "Return @code{#t} iff @var{x} is a structure object, else\n"
228 #define FUNC_NAME s_scm_struct_p
230 return scm_from_bool(SCM_STRUCTP (x
));
234 SCM_DEFINE (scm_struct_vtable_p
, "struct-vtable?", 1, 0, 0,
236 "Return @code{#t} iff @var{x} is a vtable structure.")
237 #define FUNC_NAME s_scm_struct_vtable_p
243 if (!SCM_STRUCTP (x
))
246 layout
= SCM_STRUCT_LAYOUT (x
);
248 if (scm_i_symbol_length (layout
)
249 < scm_i_string_length (required_vtable_fields
))
252 tmp
= strncmp (scm_i_symbol_chars (layout
),
253 scm_i_string_chars (required_vtable_fields
),
254 scm_i_string_length (required_vtable_fields
));
255 scm_remember_upto_here_1 (required_vtable_fields
);
259 mem
= SCM_STRUCT_DATA (x
);
261 return scm_from_bool (scm_is_symbol (SCM_PACK (mem
[scm_vtable_index_layout
])));
266 /* All struct data must be allocated at an address whose bottom three
267 bits are zero. This is because the tag for a struct lives in the
268 bottom three bits of the struct's car, and the upper bits point to
269 the data of its vtable, which is a struct itself. Thus, if the
270 address of that data doesn't end in three zeros, tagging it will
273 This function allocates a block of memory, and returns a pointer at
274 least scm_struct_n_extra_words words into the block. Furthermore,
275 it guarantees that that pointer's least three significant bits are
278 The argument n_words should be the number of words that should
279 appear after the returned address. (That is, it shouldn't include
280 scm_struct_n_extra_words.)
282 This function initializes the following fields of the struct:
284 scm_struct_i_ptr --- the actual start of the block of memory; the
285 address you should pass to 'free' to dispose of the block.
286 This field allows us to both guarantee that the returned
287 address is divisible by eight, and allow the GC to free the
290 scm_struct_i_n_words --- the number of words allocated to the
291 block, including the extra fields. This is used by the GC.
297 scm_alloc_struct (int n_words
, int n_extra
, const char *what
)
299 int size
= sizeof (scm_t_bits
) * (n_words
+ n_extra
) + 7;
300 void * block
= scm_gc_malloc (size
, what
);
302 /* Adjust the pointer to hide the extra words. */
303 scm_t_bits
* p
= (scm_t_bits
*) block
+ n_extra
;
305 /* Adjust it even further so it's aligned on an eight-byte boundary. */
306 p
= (scm_t_bits
*) (((scm_t_bits
) p
+ 7) & ~7);
308 /* Initialize a few fields as described above. */
309 p
[scm_struct_i_free
] = (scm_t_bits
) scm_struct_free_standard
;
310 p
[scm_struct_i_ptr
] = (scm_t_bits
) block
;
311 p
[scm_struct_i_n_words
] = n_words
;
312 p
[scm_struct_i_flags
] = 0;
321 /* Invoke the finalizer of the struct pointed to by PTR. */
323 struct_finalizer_trampoline (GC_PTR ptr
, GC_PTR unused_data
)
325 SCM obj
= PTR2SCM (ptr
);
327 /* XXX - use less explicit code. */
328 scm_t_bits word0
= SCM_CELL_WORD_0 (obj
) - scm_tc3_struct
;
329 scm_t_bits
*vtable_data
= (scm_t_bits
*) word0
;
330 scm_t_bits
*data
= SCM_STRUCT_DATA (obj
);
331 scm_t_struct_free free_struct_data
332 = ((scm_t_struct_free
) vtable_data
[scm_struct_i_free
]);
334 SCM_SET_CELL_TYPE (obj
, scm_tc_free_cell
);
337 /* A sanity check. However, this check can fail if the free function
338 changed between the `make-struct' time and now. */
339 if (free_struct_data
!= (scm_t_struct_free
)unused_data
)
343 if (free_struct_data
)
344 free_struct_data (vtable_data
, data
);
350 scm_struct_free_0 (scm_t_bits
* vtable SCM_UNUSED
,
351 scm_t_bits
* data SCM_UNUSED
)
356 scm_struct_free_light (scm_t_bits
* vtable
, scm_t_bits
* data
)
358 size_t n
= vtable
[scm_struct_i_size
] & ~SCM_STRUCTF_MASK
;
359 scm_gc_free (data
, n
, "struct");
363 scm_struct_free_standard (scm_t_bits
* vtable SCM_UNUSED
, scm_t_bits
* data
)
365 size_t n
= (data
[scm_struct_i_n_words
] + scm_struct_n_extra_words
)
366 * sizeof (scm_t_bits
) + 7;
367 scm_gc_free ((void *) data
[scm_struct_i_ptr
], n
, "heavy struct");
371 scm_struct_free_entity (scm_t_bits
* vtable SCM_UNUSED
, scm_t_bits
* data
)
373 size_t n
= (data
[scm_struct_i_n_words
] + scm_struct_entity_n_extra_words
)
374 * sizeof (scm_t_bits
) + 7;
375 scm_gc_free ((void *) data
[scm_struct_i_ptr
], n
, "entity struct");
380 SCM_DEFINE (scm_make_struct
, "make-struct", 2, 0, 1,
381 (SCM vtable
, SCM tail_array_size
, SCM init
),
382 "Create a new structure.\n\n"
383 "@var{type} must be a vtable structure (@pxref{Vtables}).\n\n"
384 "@var{tail-elts} must be a non-negative integer. If the layout\n"
385 "specification indicated by @var{type} includes a tail-array,\n"
386 "this is the number of elements allocated to that array.\n\n"
387 "The @var{init1}, @dots{} are optional arguments describing how\n"
388 "successive fields of the structure should be initialized. Only fields\n"
389 "with protection 'r' or 'w' can be initialized, except for fields of\n"
390 "type 's', which are automatically initialized to point to the new\n"
391 "structure itself; fields with protection 'o' can not be initialized by\n"
392 "Scheme programs.\n\n"
393 "If fewer optional arguments than initializable fields are supplied,\n"
394 "fields of type 'p' get default value #f while fields of type 'u' are\n"
395 "initialized to 0.\n\n"
396 "Structs are currently the basic representation for record-like data\n"
397 "structures in Guile. The plan is to eventually replace them with a\n"
398 "new representation which will at the same time be easier to use and\n"
400 "For more information, see the documentation for @code{make-vtable-vtable}.")
401 #define FUNC_NAME s_scm_make_struct
406 scm_t_bits
*data
, *c_vtable
;
409 SCM_VALIDATE_VTABLE (1, vtable
);
410 SCM_VALIDATE_REST_ARGUMENT (init
);
412 c_vtable
= SCM_STRUCT_DATA (vtable
);
414 layout
= SCM_PACK (c_vtable
[scm_vtable_index_layout
]);
415 basic_size
= scm_i_symbol_length (layout
) / 2;
416 tail_elts
= scm_to_size_t (tail_array_size
);
417 SCM_CRITICAL_SECTION_START
;
418 if (c_vtable
[scm_struct_i_flags
] & SCM_STRUCTF_ENTITY
)
420 data
= scm_alloc_struct (basic_size
+ tail_elts
,
421 scm_struct_entity_n_extra_words
,
423 data
[scm_struct_i_procedure
] = SCM_UNPACK (SCM_BOOL_F
);
424 data
[scm_struct_i_setter
] = SCM_UNPACK (SCM_BOOL_F
);
427 data
= scm_alloc_struct (basic_size
+ tail_elts
,
428 scm_struct_n_extra_words
,
430 handle
= scm_double_cell ((((scm_t_bits
) c_vtable
)
432 (scm_t_bits
) data
, 0, 0);
433 scm_struct_init (handle
, layout
, data
, tail_elts
, init
);
435 if (c_vtable
[scm_struct_i_free
])
437 /* Register a finalizer for the newly created instance. */
438 GC_finalization_proc prev_finalizer
;
439 GC_PTR prev_finalizer_data
;
440 scm_t_struct_free free_struct
=
441 (scm_t_struct_free
)c_vtable
[scm_struct_i_free
];
443 GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (handle
),
444 struct_finalizer_trampoline
,
447 &prev_finalizer_data
);
450 SCM_CRITICAL_SECTION_END
;
457 SCM_DEFINE (scm_make_vtable_vtable
, "make-vtable-vtable", 2, 0, 1,
458 (SCM user_fields
, SCM tail_array_size
, SCM init
),
459 "Return a new, self-describing vtable structure.\n\n"
460 "@var{user-fields} is a string describing user defined fields of the\n"
461 "vtable beginning at index @code{vtable-offset-user}\n"
462 "(see @code{make-struct-layout}).\n\n"
463 "@var{tail-size} specifies the size of the tail-array (if any) of\n"
465 "@var{init1}, @dots{} are the optional initializers for the fields of\n"
467 "Vtables have one initializable system field---the struct printer.\n"
468 "This field comes before the user fields in the initializers passed\n"
469 "to @code{make-vtable-vtable} and @code{make-struct}, and thus works as\n"
470 "a third optional argument to @code{make-vtable-vtable} and a fourth to\n"
471 "@code{make-struct} when creating vtables:\n\n"
472 "If the value is a procedure, it will be called instead of the standard\n"
473 "printer whenever a struct described by this vtable is printed.\n"
474 "The procedure will be called with arguments STRUCT and PORT.\n\n"
475 "The structure of a struct is described by a vtable, so the vtable is\n"
476 "in essence the type of the struct. The vtable is itself a struct with\n"
477 "a vtable. This could go on forever if it weren't for the\n"
478 "vtable-vtables which are self-describing vtables, and thus terminate\n"
480 "There are several potential ways of using structs, but the standard\n"
481 "one is to use three kinds of structs, together building up a type\n"
482 "sub-system: one vtable-vtable working as the root and one or several\n"
483 "\"types\", each with a set of \"instances\". (The vtable-vtable should be\n"
484 "compared to the class <class> which is the class of itself.)\n\n"
486 "(define ball-root (make-vtable-vtable \"pr\" 0))\n\n"
487 "(define (make-ball-type ball-color)\n"
488 " (make-struct ball-root 0\n"
489 " (make-struct-layout \"pw\")\n"
490 " (lambda (ball port)\n"
491 " (format port \"#<a ~A ball owned by ~A>\"\n"
495 "(define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))\n"
496 "(define (owner ball) (struct-ref ball 0))\n\n"
497 "(define red (make-ball-type 'red))\n"
498 "(define green (make-ball-type 'green))\n\n"
499 "(define (make-ball type owner) (make-struct type 0 owner))\n\n"
500 "(define ball (make-ball green 'Nisse))\n"
501 "ball @result{} #<a green ball owned by Nisse>\n"
503 #define FUNC_NAME s_scm_make_vtable_vtable
512 SCM_VALIDATE_STRING (1, user_fields
);
513 SCM_VALIDATE_REST_ARGUMENT (init
);
515 fields
= scm_string_append (scm_list_2 (required_vtable_fields
,
517 layout
= scm_make_struct_layout (fields
);
518 basic_size
= scm_i_symbol_length (layout
) / 2;
519 tail_elts
= scm_to_size_t (tail_array_size
);
520 SCM_CRITICAL_SECTION_START
;
521 data
= scm_alloc_struct (basic_size
+ tail_elts
,
522 scm_struct_n_extra_words
,
524 handle
= scm_double_cell ((scm_t_bits
) data
+ scm_tc3_struct
,
525 (scm_t_bits
) data
, 0, 0);
526 data
[scm_vtable_index_layout
] = SCM_UNPACK (layout
);
527 scm_struct_init (handle
, layout
, data
, tail_elts
, scm_cons (layout
, init
));
528 SCM_CRITICAL_SECTION_END
;
534 /* Return true if S1 and S2 are equal structures, i.e., if their vtable and
535 contents are the same. Field protections are honored. Thus, it is an
536 error to test the equality of structures that contain opaque fields. */
538 scm_i_struct_equalp (SCM s1
, SCM s2
)
539 #define FUNC_NAME "scm_i_struct_equalp"
541 SCM vtable1
, vtable2
, layout
;
542 size_t struct_size
, field_num
;
544 SCM_VALIDATE_STRUCT (1, s1
);
545 SCM_VALIDATE_STRUCT (2, s2
);
547 vtable1
= SCM_STRUCT_VTABLE (s1
);
548 vtable2
= SCM_STRUCT_VTABLE (s2
);
550 if (!scm_is_eq (vtable1
, vtable2
))
553 layout
= SCM_STRUCT_LAYOUT (s1
);
554 struct_size
= scm_i_symbol_length (layout
) / 2;
556 for (field_num
= 0; field_num
< struct_size
; field_num
++)
561 /* We have to use `scm_struct_ref ()' here so that fields are accessed
562 consistently, notably wrt. field types and access rights. */
563 s_field_num
= scm_from_size_t (field_num
);
564 field1
= scm_struct_ref (s1
, s_field_num
);
565 field2
= scm_struct_ref (s2
, s_field_num
);
567 if (scm_is_false (scm_equal_p (field1
, field2
)))
579 SCM_DEFINE (scm_struct_ref
, "struct-ref", 2, 0, 0,
580 (SCM handle
, SCM pos
),
581 "@deffnx {Scheme Procedure} struct-set! struct n value\n"
582 "Access (or modify) the @var{n}th field of @var{struct}.\n\n"
583 "If the field is of type 'p', then it can be set to an arbitrary value.\n\n"
584 "If the field is of type 'u', then it can only be set to a non-negative\n"
585 "integer value small enough to fit in one machine word.")
586 #define FUNC_NAME s_scm_struct_ref
588 SCM answer
= SCM_UNDEFINED
;
594 const char *fields_desc
;
598 SCM_VALIDATE_STRUCT (1, handle
);
600 layout
= SCM_STRUCT_LAYOUT (handle
);
601 data
= SCM_STRUCT_DATA (handle
);
602 p
= scm_to_size_t (pos
);
604 fields_desc
= scm_i_symbol_chars (layout
);
605 layout_len
= scm_i_symbol_length (layout
);
606 n_fields
= data
[scm_struct_i_n_words
];
608 SCM_ASSERT_RANGE(1, pos
, p
< n_fields
);
610 if (p
* 2 < layout_len
)
613 field_type
= fields_desc
[p
* 2];
614 ref
= fields_desc
[p
* 2 + 1];
615 if ((ref
!= 'r') && (ref
!= 'w'))
617 if ((ref
== 'R') || (ref
== 'W'))
620 SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos
));
623 else if (fields_desc
[layout_len
- 1] != 'O')
624 field_type
= fields_desc
[layout_len
- 2];
626 SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos
));
631 answer
= scm_from_ulong (data
[p
]);
636 answer
= scm_from_long (data
[p
]);
640 answer
= scm_make_real (*((double *)&(data
[p
])));
646 answer
= SCM_PACK (data
[p
]);
651 SCM_MISC_ERROR ("unrecognized field type: ~S",
652 scm_list_1 (SCM_MAKE_CHAR (field_type
)));
660 SCM_DEFINE (scm_struct_set_x
, "struct-set!", 3, 0, 0,
661 (SCM handle
, SCM pos
, SCM val
),
662 "Set the slot of the structure @var{handle} with index @var{pos}\n"
663 "to @var{val}. Signal an error if the slot can not be written\n"
665 #define FUNC_NAME s_scm_struct_set_x
672 const char *fields_desc
;
675 SCM_VALIDATE_STRUCT (1, handle
);
677 layout
= SCM_STRUCT_LAYOUT (handle
);
678 data
= SCM_STRUCT_DATA (handle
);
679 p
= scm_to_size_t (pos
);
681 fields_desc
= scm_i_symbol_chars (layout
);
682 layout_len
= scm_i_symbol_length (layout
);
683 n_fields
= data
[scm_struct_i_n_words
];
685 SCM_ASSERT_RANGE (1, pos
, p
< n_fields
);
687 if (p
* 2 < layout_len
)
690 field_type
= fields_desc
[p
* 2];
691 set_x
= fields_desc
[p
* 2 + 1];
693 SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos
));
695 else if (fields_desc
[layout_len
- 1] == 'W')
696 field_type
= fields_desc
[layout_len
- 2];
698 SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos
));
703 data
[p
] = SCM_NUM2ULONG (3, val
);
708 data
[p
] = SCM_NUM2LONG (3, val
);
712 *((double *)&(data
[p
])) = scm_num2dbl (val
, (char *)SCM_ARG3
);
717 data
[p
] = SCM_UNPACK (val
);
721 SCM_MISC_ERROR ("self fields immutable", SCM_EOL
);
724 SCM_MISC_ERROR ("unrecognized field type: ~S",
725 scm_list_1 (SCM_MAKE_CHAR (field_type
)));
733 SCM_DEFINE (scm_struct_vtable
, "struct-vtable", 1, 0, 0,
735 "Return the vtable structure that describes the type of @var{struct}.")
736 #define FUNC_NAME s_scm_struct_vtable
738 SCM_VALIDATE_STRUCT (1, handle
);
739 return SCM_STRUCT_VTABLE (handle
);
744 SCM_DEFINE (scm_struct_vtable_tag
, "struct-vtable-tag", 1, 0, 0,
746 "Return the vtable tag of the structure @var{handle}.")
747 #define FUNC_NAME s_scm_struct_vtable_tag
749 SCM_VALIDATE_VTABLE (1, handle
);
750 return scm_from_ulong (((unsigned long)SCM_STRUCT_DATA (handle
)) >> 3);
754 /* {Associating names and classes with vtables}
756 * The name of a vtable should probably be stored as a slot. This is
757 * a backward compatible solution until agreement has been achieved on
758 * how to associate names with vtables.
762 scm_struct_ihashq (SCM obj
, unsigned long n
)
764 /* The length of the hash table should be a relative prime it's not
765 necessary to shift down the address. */
766 return SCM_UNPACK (obj
) % n
;
770 scm_struct_create_handle (SCM obj
)
772 SCM handle
= scm_hash_fn_create_handle_x (scm_struct_table
,
778 if (scm_is_false (SCM_CDR (handle
)))
779 SCM_SETCDR (handle
, scm_cons (SCM_BOOL_F
, SCM_BOOL_F
));
783 SCM_DEFINE (scm_struct_vtable_name
, "struct-vtable-name", 1, 0, 0,
785 "Return the name of the vtable @var{vtable}.")
786 #define FUNC_NAME s_scm_struct_vtable_name
788 SCM_VALIDATE_VTABLE (1, vtable
);
789 return SCM_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable
)));
793 SCM_DEFINE (scm_set_struct_vtable_name_x
, "set-struct-vtable-name!", 2, 0, 0,
794 (SCM vtable
, SCM name
),
795 "Set the name of the vtable @var{vtable} to @var{name}.")
796 #define FUNC_NAME s_scm_set_struct_vtable_name_x
798 SCM_VALIDATE_VTABLE (1, vtable
);
799 SCM_VALIDATE_SYMBOL (2, name
);
800 SCM_SET_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable
)),
802 return SCM_UNSPECIFIED
;
810 scm_print_struct (SCM exp
, SCM port
, scm_print_state
*pstate
)
812 if (scm_is_true (scm_procedure_p (SCM_STRUCT_PRINTER (exp
))))
813 scm_printer_apply (SCM_STRUCT_PRINTER (exp
), exp
, port
, pstate
);
816 SCM vtable
= SCM_STRUCT_VTABLE (exp
);
817 SCM name
= scm_struct_vtable_name (vtable
);
818 scm_puts ("#<", port
);
819 if (scm_is_true (name
))
820 scm_display (name
, port
);
822 scm_puts ("struct", port
);
823 scm_putc (' ', port
);
824 scm_uintprint (SCM_UNPACK (vtable
), 16, port
);
825 scm_putc (':', port
);
826 scm_uintprint (SCM_UNPACK (exp
), 16, port
);
827 scm_putc ('>', port
);
832 scm_struct_prehistory ()
841 = scm_permanent_object (scm_make_weak_key_hash_table (scm_from_int (31)));
842 required_vtable_fields
= scm_from_locale_string ("prsrpw");
843 scm_permanent_object (required_vtable_fields
);
844 scm_c_define ("vtable-index-layout", scm_from_int (scm_vtable_index_layout
));
845 scm_c_define ("vtable-index-vtable", scm_from_int (scm_vtable_index_vtable
));
846 scm_c_define ("vtable-index-printer",
847 scm_from_int (scm_vtable_index_printer
));
848 scm_c_define ("vtable-offset-user", scm_from_int (scm_vtable_offset_user
));
849 #include "libguile/struct.x"