1 /* Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, 2008 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"
42 #include "libguile/boehm-gc.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
) 0;
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;
314 /* Since `SCM' objects will record either P or P + SCM_TC3_STRUCT, we need
315 to register them as valid displacements. Fortunately, only a handful of
316 N_EXTRA values are used in core Guile. */
317 GC_REGISTER_DISPLACEMENT ((char *)p
- (char *)block
);
318 GC_REGISTER_DISPLACEMENT ((char *)p
- (char *)block
+ scm_tc3_struct
);
327 /* Invoke the finalizer of the struct pointed to by PTR. */
329 struct_finalizer_trampoline (GC_PTR ptr
, GC_PTR unused_data
)
331 SCM obj
= PTR2SCM (ptr
);
333 /* XXX - use less explicit code. */
334 scm_t_bits word0
= SCM_CELL_WORD_0 (obj
) - scm_tc3_struct
;
335 scm_t_bits
*vtable_data
= (scm_t_bits
*) word0
;
336 scm_t_bits
*data
= SCM_STRUCT_DATA (obj
);
337 scm_t_struct_free free_struct_data
338 = ((scm_t_struct_free
) vtable_data
[scm_struct_i_free
]);
340 SCM_SET_CELL_TYPE (obj
, scm_tc_free_cell
);
343 /* A sanity check. However, this check can fail if the free function
344 changed between the `make-struct' time and now. */
345 if (free_struct_data
!= (scm_t_struct_free
)unused_data
)
349 if (free_struct_data
)
350 free_struct_data (vtable_data
, data
);
356 SCM_DEFINE (scm_make_struct
, "make-struct", 2, 0, 1,
357 (SCM vtable
, SCM tail_array_size
, SCM init
),
358 "Create a new structure.\n\n"
359 "@var{type} must be a vtable structure (@pxref{Vtables}).\n\n"
360 "@var{tail-elts} must be a non-negative integer. If the layout\n"
361 "specification indicated by @var{type} includes a tail-array,\n"
362 "this is the number of elements allocated to that array.\n\n"
363 "The @var{init1}, @dots{} are optional arguments describing how\n"
364 "successive fields of the structure should be initialized. Only fields\n"
365 "with protection 'r' or 'w' can be initialized, except for fields of\n"
366 "type 's', which are automatically initialized to point to the new\n"
367 "structure itself; fields with protection 'o' can not be initialized by\n"
368 "Scheme programs.\n\n"
369 "If fewer optional arguments than initializable fields are supplied,\n"
370 "fields of type 'p' get default value #f while fields of type 'u' are\n"
371 "initialized to 0.\n\n"
372 "Structs are currently the basic representation for record-like data\n"
373 "structures in Guile. The plan is to eventually replace them with a\n"
374 "new representation which will at the same time be easier to use and\n"
376 "For more information, see the documentation for @code{make-vtable-vtable}.")
377 #define FUNC_NAME s_scm_make_struct
382 scm_t_bits
*data
, *c_vtable
;
385 SCM_VALIDATE_VTABLE (1, vtable
);
386 SCM_VALIDATE_REST_ARGUMENT (init
);
388 c_vtable
= SCM_STRUCT_DATA (vtable
);
390 layout
= SCM_PACK (c_vtable
[scm_vtable_index_layout
]);
391 basic_size
= scm_i_symbol_length (layout
) / 2;
392 tail_elts
= scm_to_size_t (tail_array_size
);
394 /* A tail array is only allowed if the layout fields string ends in "R",
398 SCM layout_str
, last_char
;
403 SCM_MISC_ERROR ("tail array not allowed unless layout ends R, W, or O", SCM_EOL
);
406 layout_str
= scm_symbol_to_string (layout
);
407 last_char
= scm_string_ref (layout_str
,
408 scm_from_size_t (2 * basic_size
- 1));
409 if (! SCM_LAYOUT_TAILP (SCM_CHAR (last_char
)))
413 /* In guile 1.8.5 and earlier, everything below was covered by a
414 CRITICAL_SECTION lock. This can lead to deadlocks in garbage
415 collection, since other threads might be holding the heap_mutex, while
416 sleeping on the CRITICAL_SECTION lock. There does not seem to be any
417 need for a lock on the section below, as it does not access or update
418 any globals, so the critical section has been removed. */
420 if (c_vtable
[scm_struct_i_flags
] & SCM_STRUCTF_ENTITY
)
422 data
= scm_alloc_struct (basic_size
+ tail_elts
,
423 scm_struct_entity_n_extra_words
,
425 data
[scm_struct_i_procedure
] = SCM_UNPACK (SCM_BOOL_F
);
426 data
[scm_struct_i_setter
] = SCM_UNPACK (SCM_BOOL_F
);
429 data
= scm_alloc_struct (basic_size
+ tail_elts
,
430 scm_struct_n_extra_words
,
432 handle
= scm_double_cell ((((scm_t_bits
) c_vtable
)
434 (scm_t_bits
) data
, 0, 0);
436 if (c_vtable
[scm_struct_i_free
])
438 /* Register a finalizer for the newly created instance. */
439 GC_finalization_proc prev_finalizer
;
440 GC_PTR prev_finalizer_data
;
441 scm_t_struct_free free_struct
=
442 (scm_t_struct_free
)c_vtable
[scm_struct_i_free
];
444 GC_REGISTER_FINALIZER_NO_ORDER (SCM2PTR (handle
),
445 struct_finalizer_trampoline
,
448 &prev_finalizer_data
);
451 scm_struct_init (handle
, layout
, data
, tail_elts
, init
);
459 SCM_DEFINE (scm_make_vtable_vtable
, "make-vtable-vtable", 2, 0, 1,
460 (SCM user_fields
, SCM tail_array_size
, SCM init
),
461 "Return a new, self-describing vtable structure.\n\n"
462 "@var{user-fields} is a string describing user defined fields of the\n"
463 "vtable beginning at index @code{vtable-offset-user}\n"
464 "(see @code{make-struct-layout}).\n\n"
465 "@var{tail-size} specifies the size of the tail-array (if any) of\n"
467 "@var{init1}, @dots{} are the optional initializers for the fields of\n"
469 "Vtables have one initializable system field---the struct printer.\n"
470 "This field comes before the user fields in the initializers passed\n"
471 "to @code{make-vtable-vtable} and @code{make-struct}, and thus works as\n"
472 "a third optional argument to @code{make-vtable-vtable} and a fourth to\n"
473 "@code{make-struct} when creating vtables:\n\n"
474 "If the value is a procedure, it will be called instead of the standard\n"
475 "printer whenever a struct described by this vtable is printed.\n"
476 "The procedure will be called with arguments STRUCT and PORT.\n\n"
477 "The structure of a struct is described by a vtable, so the vtable is\n"
478 "in essence the type of the struct. The vtable is itself a struct with\n"
479 "a vtable. This could go on forever if it weren't for the\n"
480 "vtable-vtables which are self-describing vtables, and thus terminate\n"
482 "There are several potential ways of using structs, but the standard\n"
483 "one is to use three kinds of structs, together building up a type\n"
484 "sub-system: one vtable-vtable working as the root and one or several\n"
485 "\"types\", each with a set of \"instances\". (The vtable-vtable should be\n"
486 "compared to the class <class> which is the class of itself.)\n\n"
488 "(define ball-root (make-vtable-vtable \"pr\" 0))\n\n"
489 "(define (make-ball-type ball-color)\n"
490 " (make-struct ball-root 0\n"
491 " (make-struct-layout \"pw\")\n"
492 " (lambda (ball port)\n"
493 " (format port \"#<a ~A ball owned by ~A>\"\n"
497 "(define (color ball) (struct-ref (struct-vtable ball) vtable-offset-user))\n"
498 "(define (owner ball) (struct-ref ball 0))\n\n"
499 "(define red (make-ball-type 'red))\n"
500 "(define green (make-ball-type 'green))\n\n"
501 "(define (make-ball type owner) (make-struct type 0 owner))\n\n"
502 "(define ball (make-ball green 'Nisse))\n"
503 "ball @result{} #<a green ball owned by Nisse>\n"
505 #define FUNC_NAME s_scm_make_vtable_vtable
514 SCM_VALIDATE_STRING (1, user_fields
);
515 SCM_VALIDATE_REST_ARGUMENT (init
);
517 fields
= scm_string_append (scm_list_2 (required_vtable_fields
,
519 layout
= scm_make_struct_layout (fields
);
520 basic_size
= scm_i_symbol_length (layout
) / 2;
521 tail_elts
= scm_to_size_t (tail_array_size
);
522 SCM_CRITICAL_SECTION_START
;
523 data
= scm_alloc_struct (basic_size
+ tail_elts
,
524 scm_struct_n_extra_words
,
526 handle
= scm_double_cell ((scm_t_bits
) data
+ scm_tc3_struct
,
527 (scm_t_bits
) data
, 0, 0);
528 data
[scm_vtable_index_layout
] = SCM_UNPACK (layout
);
529 scm_struct_init (handle
, layout
, data
, tail_elts
, scm_cons (layout
, init
));
530 SCM_CRITICAL_SECTION_END
;
536 static SCM scm_i_vtable_vtable_no_extra_fields
;
538 SCM_DEFINE (scm_make_vtable
, "make-vtable", 1, 1, 0,
539 (SCM fields
, SCM printer
),
540 "Create a vtable, for creating structures with the given\n"
543 "The optional @var{printer} argument is a function to be called\n"
544 "@code{(@var{printer} struct port)} on the structures created.\n"
545 "It should look at @var{struct} and write to @var{port}.")
546 #define FUNC_NAME s_scm_make_vtable
548 if (SCM_UNBNDP (printer
))
549 printer
= SCM_BOOL_F
;
551 return scm_make_struct (scm_i_vtable_vtable_no_extra_fields
, SCM_INUM0
,
552 scm_list_2 (scm_make_struct_layout (fields
),
558 /* Return true if S1 and S2 are equal structures, i.e., if their vtable and
559 contents are the same. Field protections are honored. Thus, it is an
560 error to test the equality of structures that contain opaque fields. */
562 scm_i_struct_equalp (SCM s1
, SCM s2
)
563 #define FUNC_NAME "scm_i_struct_equalp"
565 SCM vtable1
, vtable2
, layout
;
566 size_t struct_size
, field_num
;
568 SCM_VALIDATE_STRUCT (1, s1
);
569 SCM_VALIDATE_STRUCT (2, s2
);
571 vtable1
= SCM_STRUCT_VTABLE (s1
);
572 vtable2
= SCM_STRUCT_VTABLE (s2
);
574 if (!scm_is_eq (vtable1
, vtable2
))
577 layout
= SCM_STRUCT_LAYOUT (s1
);
578 struct_size
= scm_i_symbol_length (layout
) / 2;
580 for (field_num
= 0; field_num
< struct_size
; field_num
++)
585 /* We have to use `scm_struct_ref ()' here so that fields are accessed
586 consistently, notably wrt. field types and access rights. */
587 s_field_num
= scm_from_size_t (field_num
);
588 field1
= scm_struct_ref (s1
, s_field_num
);
589 field2
= scm_struct_ref (s2
, s_field_num
);
591 /* Self-referencing fields (type `s') must be skipped to avoid infinite
593 if (!(scm_is_eq (field1
, s1
) && (scm_is_eq (field2
, s2
))))
594 if (scm_is_false (scm_equal_p (field1
, field2
)))
598 /* FIXME: Tail elements should be tested for equality. */
608 SCM_DEFINE (scm_struct_ref
, "struct-ref", 2, 0, 0,
609 (SCM handle
, SCM pos
),
610 "@deffnx {Scheme Procedure} struct-set! struct n value\n"
611 "Access (or modify) the @var{n}th field of @var{struct}.\n\n"
612 "If the field is of type 'p', then it can be set to an arbitrary value.\n\n"
613 "If the field is of type 'u', then it can only be set to a non-negative\n"
614 "integer value small enough to fit in one machine word.")
615 #define FUNC_NAME s_scm_struct_ref
617 SCM answer
= SCM_UNDEFINED
;
623 const char *fields_desc
;
627 SCM_VALIDATE_STRUCT (1, handle
);
629 layout
= SCM_STRUCT_LAYOUT (handle
);
630 data
= SCM_STRUCT_DATA (handle
);
631 p
= scm_to_size_t (pos
);
633 fields_desc
= scm_i_symbol_chars (layout
);
634 layout_len
= scm_i_symbol_length (layout
);
635 if (SCM_STRUCT_VTABLE_FLAGS (handle
) & SCM_STRUCTF_LIGHT
)
637 n_fields
= layout_len
/ 2;
639 n_fields
= data
[scm_struct_i_n_words
];
641 SCM_ASSERT_RANGE(1, pos
, p
< n_fields
);
643 if (p
* 2 < layout_len
)
646 field_type
= fields_desc
[p
* 2];
647 ref
= fields_desc
[p
* 2 + 1];
648 if ((ref
!= 'r') && (ref
!= 'w'))
650 if ((ref
== 'R') || (ref
== 'W'))
653 SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos
));
656 else if (fields_desc
[layout_len
- 1] != 'O')
657 field_type
= fields_desc
[layout_len
- 2];
659 SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos
));
664 answer
= scm_from_ulong (data
[p
]);
669 answer
= scm_from_long (data
[p
]);
673 answer
= scm_make_real (*((double *)&(data
[p
])));
679 answer
= SCM_PACK (data
[p
]);
684 SCM_MISC_ERROR ("unrecognized field type: ~S",
685 scm_list_1 (SCM_MAKE_CHAR (field_type
)));
693 SCM_DEFINE (scm_struct_set_x
, "struct-set!", 3, 0, 0,
694 (SCM handle
, SCM pos
, SCM val
),
695 "Set the slot of the structure @var{handle} with index @var{pos}\n"
696 "to @var{val}. Signal an error if the slot can not be written\n"
698 #define FUNC_NAME s_scm_struct_set_x
705 const char *fields_desc
;
708 SCM_VALIDATE_STRUCT (1, handle
);
710 layout
= SCM_STRUCT_LAYOUT (handle
);
711 data
= SCM_STRUCT_DATA (handle
);
712 p
= scm_to_size_t (pos
);
714 fields_desc
= scm_i_symbol_chars (layout
);
715 layout_len
= scm_i_symbol_length (layout
);
716 if (SCM_STRUCT_VTABLE_FLAGS (handle
) & SCM_STRUCTF_LIGHT
)
718 n_fields
= layout_len
/ 2;
720 n_fields
= data
[scm_struct_i_n_words
];
722 SCM_ASSERT_RANGE (1, pos
, p
< n_fields
);
724 if (p
* 2 < layout_len
)
727 field_type
= fields_desc
[p
* 2];
728 set_x
= fields_desc
[p
* 2 + 1];
730 SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos
));
732 else if (fields_desc
[layout_len
- 1] == 'W')
733 field_type
= fields_desc
[layout_len
- 2];
735 SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos
));
740 data
[p
] = SCM_NUM2ULONG (3, val
);
745 data
[p
] = SCM_NUM2LONG (3, val
);
749 *((double *)&(data
[p
])) = scm_num2dbl (val
, (char *)SCM_ARG3
);
754 data
[p
] = SCM_UNPACK (val
);
758 SCM_MISC_ERROR ("self fields immutable", SCM_EOL
);
761 SCM_MISC_ERROR ("unrecognized field type: ~S",
762 scm_list_1 (SCM_MAKE_CHAR (field_type
)));
770 SCM_DEFINE (scm_struct_vtable
, "struct-vtable", 1, 0, 0,
772 "Return the vtable structure that describes the type of @var{struct}.")
773 #define FUNC_NAME s_scm_struct_vtable
775 SCM_VALIDATE_STRUCT (1, handle
);
776 return SCM_STRUCT_VTABLE (handle
);
781 SCM_DEFINE (scm_struct_vtable_tag
, "struct-vtable-tag", 1, 0, 0,
783 "Return the vtable tag of the structure @var{handle}.")
784 #define FUNC_NAME s_scm_struct_vtable_tag
786 SCM_VALIDATE_VTABLE (1, handle
);
787 return scm_from_ulong (((unsigned long)SCM_STRUCT_DATA (handle
)) >> 3);
791 /* {Associating names and classes with vtables}
793 * The name of a vtable should probably be stored as a slot. This is
794 * a backward compatible solution until agreement has been achieved on
795 * how to associate names with vtables.
799 scm_struct_ihashq (SCM obj
, unsigned long n
)
801 /* The length of the hash table should be a relative prime it's not
802 necessary to shift down the address. */
803 return SCM_UNPACK (obj
) % n
;
807 scm_struct_create_handle (SCM obj
)
809 SCM handle
= scm_hash_fn_create_handle_x (scm_struct_table
,
815 if (scm_is_false (SCM_CDR (handle
)))
816 SCM_SETCDR (handle
, scm_cons (SCM_BOOL_F
, SCM_BOOL_F
));
820 SCM_DEFINE (scm_struct_vtable_name
, "struct-vtable-name", 1, 0, 0,
822 "Return the name of the vtable @var{vtable}.")
823 #define FUNC_NAME s_scm_struct_vtable_name
825 SCM_VALIDATE_VTABLE (1, vtable
);
826 return SCM_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable
)));
830 SCM_DEFINE (scm_set_struct_vtable_name_x
, "set-struct-vtable-name!", 2, 0, 0,
831 (SCM vtable
, SCM name
),
832 "Set the name of the vtable @var{vtable} to @var{name}.")
833 #define FUNC_NAME s_scm_set_struct_vtable_name_x
835 SCM_VALIDATE_VTABLE (1, vtable
);
836 SCM_VALIDATE_SYMBOL (2, name
);
837 SCM_SET_STRUCT_TABLE_NAME (SCM_CDR (scm_struct_create_handle (vtable
)),
839 return SCM_UNSPECIFIED
;
847 scm_print_struct (SCM exp
, SCM port
, scm_print_state
*pstate
)
849 if (scm_is_true (scm_procedure_p (SCM_STRUCT_PRINTER (exp
))))
850 scm_printer_apply (SCM_STRUCT_PRINTER (exp
), exp
, port
, pstate
);
853 SCM vtable
= SCM_STRUCT_VTABLE (exp
);
854 SCM name
= scm_struct_vtable_name (vtable
);
855 scm_puts ("#<", port
);
856 if (scm_is_true (name
))
857 scm_display (name
, port
);
859 scm_puts ("struct", port
);
860 scm_putc (' ', port
);
861 scm_uintprint (SCM_UNPACK (vtable
), 16, port
);
862 scm_putc (':', port
);
863 scm_uintprint (SCM_UNPACK (exp
), 16, port
);
864 scm_putc ('>', port
);
869 scm_struct_prehistory ()
878 = scm_permanent_object (scm_make_weak_key_hash_table (scm_from_int (31)));
879 required_vtable_fields
= scm_from_locale_string ("prsrpw");
880 scm_permanent_object (required_vtable_fields
);
882 scm_i_vtable_vtable_no_extra_fields
=
884 (scm_make_vtable_vtable (scm_nullstr
, SCM_INUM0
, SCM_EOL
));
886 scm_c_define ("vtable-index-layout", scm_from_int (scm_vtable_index_layout
));
887 scm_c_define ("vtable-index-vtable", scm_from_int (scm_vtable_index_vtable
));
888 scm_c_define ("vtable-index-printer",
889 scm_from_int (scm_vtable_index_printer
));
890 scm_c_define ("vtable-offset-user", scm_from_int (scm_vtable_offset_user
));
891 #include "libguile/struct.x"