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375 lines
10 KiB
C
375 lines
10 KiB
C
/* Copyright (C) 1995,1996,1998,2000,2001 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, Free Software Foundation gives permission
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* for additional uses of the text contained in its release of this library.
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*
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* The exception is that, if you link this library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking this library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by
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* Free Software Foundation as part of this library. If you copy
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* code from other releases distributed under the terms of the GPL into a copy of
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* this library, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from such code.
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*
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* If you write modifications of your own for this library, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include "libguile/_scm.h"
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#include "libguile/vectors.h"
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#include "libguile/lang.h"
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#include "libguile/validate.h"
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#include "libguile/weaks.h"
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/* {Weak Vectors}
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*/
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/* Allocate memory for a weak vector on behalf of the caller. The allocated
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* vector will be of the given weak vector subtype. It will contain size
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* elements which are initialized with the 'fill' object, or, if 'fill' is
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* undefined, with an unspecified object.
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*/
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static SCM
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allocate_weak_vector (scm_t_bits type, SCM size, SCM fill, const char* caller)
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#define FUNC_NAME caller
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{
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if (SCM_INUMP (size))
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{
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size_t c_size;
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SCM v;
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SCM_ASSERT_RANGE (1, size, SCM_INUM (size) >= 0);
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c_size = SCM_INUM (size);
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if (c_size > 0)
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{
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scm_t_bits *base;
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size_t j;
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if (SCM_UNBNDP (fill))
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fill = SCM_UNSPECIFIED;
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SCM_ASSERT_RANGE (1, size, c_size <= SCM_VECTOR_MAX_LENGTH);
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base = scm_gc_malloc (c_size * sizeof (scm_t_bits), "weak vector");
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for (j = 0; j != c_size; ++j)
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base[j] = SCM_UNPACK (fill);
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v = scm_double_cell (SCM_MAKE_VECTOR_TAG (c_size, scm_tc7_wvect),
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(scm_t_bits) base,
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type,
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SCM_UNPACK (SCM_EOL));
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scm_remember_upto_here_1 (fill);
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}
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else
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{
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v = scm_double_cell (SCM_MAKE_VECTOR_TAG (0, scm_tc7_wvect),
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(scm_t_bits) NULL,
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type,
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SCM_UNPACK (SCM_EOL));
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}
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return v;
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}
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else if (SCM_BIGP (size))
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SCM_OUT_OF_RANGE (1, size);
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else
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SCM_WRONG_TYPE_ARG (1, size);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_weak_vector, "make-weak-vector", 1, 1, 0,
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(SCM size, SCM fill),
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"Return a weak vector with @var{size} elements. If the optional\n"
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"argument @var{fill} is given, all entries in the vector will be\n"
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"set to @var{fill}. The default value for @var{fill} is the\n"
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"empty list.")
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#define FUNC_NAME s_scm_make_weak_vector
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{
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return allocate_weak_vector (0, size, fill, FUNC_NAME);
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}
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#undef FUNC_NAME
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SCM_REGISTER_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector);
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SCM_DEFINE (scm_weak_vector, "weak-vector", 0, 0, 1,
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(SCM l),
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"@deffnx {Scheme Procedure} list->weak-vector l\n"
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"Construct a weak vector from a list: @code{weak-vector} uses\n"
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"the list of its arguments while @code{list->weak-vector} uses\n"
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"its only argument @var{l} (a list) to construct a weak vector\n"
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"the same way @code{list->vector} would.")
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#define FUNC_NAME s_scm_weak_vector
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{
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SCM res;
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SCM *data;
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long i;
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/* Dirk:FIXME:: In case of multiple threads, the list might get corrupted
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while the vector is being created. */
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i = scm_ilength (l);
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SCM_ASSERT (i >= 0, l, SCM_ARG1, FUNC_NAME);
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res = scm_make_weak_vector (SCM_MAKINUM (i), SCM_UNSPECIFIED);
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data = SCM_VELTS (res);
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while (!SCM_NULL_OR_NIL_P (l))
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{
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*data++ = SCM_CAR (l);
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l = SCM_CDR (l);
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}
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return res;
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_weak_vector_p, "weak-vector?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is a weak vector. Note that all\n"
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"weak hashes are also weak vectors.")
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#define FUNC_NAME s_scm_weak_vector_p
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{
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return SCM_BOOL (SCM_WVECTP (obj) && !SCM_IS_WHVEC (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_weak_key_hash_table, "make-weak-key-hash-table", 1, 0, 0,
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(SCM size),
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"@deffnx {Scheme Procedure} make-weak-value-hash-table size\n"
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"@deffnx {Scheme Procedure} make-doubly-weak-hash-table size\n"
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"Return a weak hash table with @var{size} buckets. As with any\n"
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"hash table, choosing a good size for the table requires some\n"
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"caution.\n"
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"\n"
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"You can modify weak hash tables in exactly the same way you\n"
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"would modify regular hash tables. (@pxref{Hash Tables})")
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#define FUNC_NAME s_scm_make_weak_key_hash_table
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{
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return allocate_weak_vector (1, size, SCM_EOL, FUNC_NAME);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_weak_value_hash_table, "make-weak-value-hash-table", 1, 0, 0,
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(SCM size),
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"Return a hash table with weak values with @var{size} buckets.\n"
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"(@pxref{Hash Tables})")
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#define FUNC_NAME s_scm_make_weak_value_hash_table
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{
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return allocate_weak_vector (2, size, SCM_EOL, FUNC_NAME);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 1, 0, 0,
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(SCM size),
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"Return a hash table with weak keys and values with @var{size}\n"
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"buckets. (@pxref{Hash Tables})")
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#define FUNC_NAME s_scm_make_doubly_weak_hash_table
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{
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return allocate_weak_vector (3, size, SCM_EOL, FUNC_NAME);
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_weak_key_hash_table_p, "weak-key-hash-table?", 1, 0, 0,
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(SCM obj),
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"@deffnx {Scheme Procedure} weak-value-hash-table? obj\n"
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"@deffnx {Scheme Procedure} doubly-weak-hash-table? obj\n"
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"Return @code{#t} if @var{obj} is the specified weak hash\n"
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"table. Note that a doubly weak hash table is neither a weak key\n"
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"nor a weak value hash table.")
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#define FUNC_NAME s_scm_weak_key_hash_table_p
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{
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return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_weak_value_hash_table_p, "weak-value-hash-table?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is a weak value hash table.")
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#define FUNC_NAME s_scm_weak_value_hash_table_p
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{
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return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC_V (obj));
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}
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#undef FUNC_NAME
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SCM_DEFINE (scm_doubly_weak_hash_table_p, "doubly-weak-hash-table?", 1, 0, 0,
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(SCM obj),
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"Return @code{#t} if @var{obj} is a doubly weak hash table.")
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#define FUNC_NAME s_scm_doubly_weak_hash_table_p
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{
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return SCM_BOOL (SCM_WVECTP (obj) && SCM_IS_WHVEC_B (obj));
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}
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#undef FUNC_NAME
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static void *
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scm_weak_vector_gc_init (void *dummy1 SCM_UNUSED,
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void *dummy2 SCM_UNUSED,
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void *dummy3 SCM_UNUSED)
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{
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scm_weak_vectors = SCM_EOL;
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return 0;
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}
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static void *
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scm_mark_weak_vector_spines (void *dummy1 SCM_UNUSED,
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void *dummy2 SCM_UNUSED,
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void *dummy3 SCM_UNUSED)
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{
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SCM w;
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for (w = scm_weak_vectors; !SCM_NULLP (w); w = SCM_WVECT_GC_CHAIN (w))
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{
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if (SCM_IS_WHVEC_ANY (w))
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{
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SCM *ptr;
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SCM obj;
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long j;
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long n;
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obj = w;
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ptr = SCM_VELTS (w);
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n = SCM_VECTOR_LENGTH (w);
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for (j = 0; j < n; ++j)
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{
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SCM alist;
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alist = ptr[j];
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while ( SCM_CONSP (alist)
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&& !SCM_GCMARKP (alist)
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&& SCM_CONSP (SCM_CAR (alist)))
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{
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SCM_SETGCMARK (alist);
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SCM_SETGCMARK (SCM_CAR (alist));
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alist = SCM_CDR (alist);
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}
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}
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}
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}
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return 0;
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}
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static void *
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scm_scan_weak_vectors (void *dummy1 SCM_UNUSED,
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void *dummy2 SCM_UNUSED,
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void *dummy3 SCM_UNUSED)
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{
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SCM *ptr, w;
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for (w = scm_weak_vectors; !SCM_NULLP (w); w = SCM_WVECT_GC_CHAIN (w))
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{
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if (!SCM_IS_WHVEC_ANY (w))
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{
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register long j, n;
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ptr = SCM_VELTS (w);
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n = SCM_VECTOR_LENGTH (w);
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for (j = 0; j < n; ++j)
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if (SCM_FREE_CELL_P (ptr[j]))
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ptr[j] = SCM_BOOL_F;
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}
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else /* if (SCM_IS_WHVEC_ANY (scm_weak_vectors[i])) */
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{
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SCM obj = w;
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register long n = SCM_VECTOR_LENGTH (w);
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register long j;
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int weak_keys = SCM_IS_WHVEC (obj) || SCM_IS_WHVEC_B (obj);
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int weak_values = SCM_IS_WHVEC_V (obj) || SCM_IS_WHVEC_B (obj);
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ptr = SCM_VELTS (w);
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for (j = 0; j < n; ++j)
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{
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SCM * fixup;
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SCM alist;
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fixup = ptr + j;
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alist = *fixup;
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while ( SCM_CONSP (alist)
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&& SCM_CONSP (SCM_CAR (alist)))
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{
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SCM key;
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SCM value;
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key = SCM_CAAR (alist);
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value = SCM_CDAR (alist);
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if ( (weak_keys && SCM_FREE_CELL_P (key))
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|| (weak_values && SCM_FREE_CELL_P (value)))
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{
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*fixup = SCM_CDR (alist);
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}
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else
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fixup = SCM_CDRLOC (alist);
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alist = SCM_CDR (alist);
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}
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}
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}
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}
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return 0;
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}
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void
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scm_weaks_prehistory ()
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{
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scm_c_hook_add (&scm_before_mark_c_hook, scm_weak_vector_gc_init, 0, 0);
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scm_c_hook_add (&scm_before_sweep_c_hook, scm_mark_weak_vector_spines, 0, 0);
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scm_c_hook_add (&scm_after_sweep_c_hook, scm_scan_weak_vectors, 0, 0);
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}
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void
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scm_init_weaks ()
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{
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#include "libguile/weaks.x"
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}
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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