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0
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1 /* The "lrecord" structure (header of a compound lisp object).
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2 Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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3 Copyright (C) 1996 Ben Wing.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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412
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24 #ifndef _XEMACS_LRECORD_H_
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25 #define _XEMACS_LRECORD_H_
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26
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27 /* The "lrecord" type of Lisp object is used for all object types
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28 other than a few simple ones. This allows many types to be
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412
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29 implemented but only a few bits required in a Lisp object for
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30 type information. (The tradeoff is that each object has its
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31 type marked in it, thereby increasing its size.) The first
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32 four bytes of all lrecords is either a pointer to a struct
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33 lrecord_implementation, which contains methods describing how
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34 to process this object, or an index into an array of pointers
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35 to struct lrecord_implementations plus some other data bits.
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36
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272
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37 Lrecords are of two types: straight lrecords, and lcrecords.
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38 Straight lrecords are used for those types of objects that have
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39 their own allocation routines (typically allocated out of 2K chunks
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40 of memory called `frob blocks'). These objects have a `struct
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41 lrecord_header' at the top, containing only the bits needed to find
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42 the lrecord_implementation for the object. There are special
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43 routines in alloc.c to deal with each such object type.
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44
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412
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45 Lcrecords are used for less common sorts of objects that don't
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46 do their own allocation. Each such object is malloc()ed
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47 individually, and the objects are chained together through
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48 a `next' pointer. Lcrecords have a `struct lcrecord_header'
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49 at the top, which contains a `struct lrecord_header' and
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50 a `next' pointer, and are allocated using alloc_lcrecord().
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51
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52 Creating a new lcrecord type is fairly easy; just follow the
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380
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53 lead of some existing type (e.g. hash tables). Note that you
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54 do not need to supply all the methods (see below); reasonable
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55 defaults are provided for many of them. Alternatively, if you're
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56 just looking for a way of encapsulating data (which possibly
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57 could contain Lisp_Objects in it), you may well be able to use
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58 the opaque type. */
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59
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60 struct lrecord_header
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2
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61 {
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211
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62 /* index into lrecord_implementations_table[] */
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420
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63 unsigned type :8;
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64 /* 1 if the object is marked during GC. */
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65 unsigned mark :1;
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66 /* 1 if the object resides in read-only space */
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67 unsigned c_readonly : 1;
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68 /* 1 if the object is readonly from lisp */
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69 unsigned lisp_readonly : 1;
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2
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70 };
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211
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71
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243
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72 struct lrecord_implementation;
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412
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73 int lrecord_type_index (CONST struct lrecord_implementation *implementation);
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272
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74
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412
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75 # define set_lheader_implementation(header,imp) do { \
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76 struct lrecord_header* SLI_header = (header); \
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412
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77 (SLI_header)->type = lrecord_type_index (imp); \
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78 (SLI_header)->mark = 0; \
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79 (SLI_header)->c_readonly = 0; \
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80 (SLI_header)->lisp_readonly = 0; \
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272
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81 } while (0)
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82
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83 struct lcrecord_header
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2
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84 {
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85 struct lrecord_header lheader;
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380
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86
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412
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87 /* The `next' field is normally used to chain all lrecords together
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88 so that the GC can find (and free) all of them.
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412
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89 `alloc_lcrecord' threads records together.
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185
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90
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91 The `next' field may be used for other purposes as long as some
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92 other mechanism is provided for letting the GC do its work.
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93
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94 For example, the event and marker object types allocate members
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95 out of memory chunks, and are able to find all unmarked members
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96 by sweeping through the elements of the list of chunks. */
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2
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97 struct lcrecord_header *next;
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380
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98
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99 /* The `uid' field is just for debugging/printing convenience.
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100 Having this slot doesn't hurt us much spacewise, since an
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101 lcrecord already has the above slots plus malloc overhead. */
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2
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102 unsigned int uid :31;
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380
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103
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104 /* The `free' field is a flag that indicates whether this lcrecord
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105 is on a "free list". Free lists are used to minimize the number
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106 of calls to malloc() when we're repeatedly allocating and freeing
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107 a number of the same sort of lcrecord. Lcrecords on a free list
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108 always get marked in a different fashion, so we can use this flag
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109 as a sanity check to make sure that free lists only have freed
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110 lcrecords and there are no freed lcrecords elsewhere. */
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2
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111 unsigned int free :1;
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112 };
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0
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113
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114 /* Used for lcrecords in an lcrecord-list. */
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115 struct free_lcrecord_header
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2
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116 {
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117 struct lcrecord_header lcheader;
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118 Lisp_Object chain;
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119 };
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0
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120
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412
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121 /* see alloc.c for an explanation */
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122 Lisp_Object this_one_is_unmarkable (Lisp_Object obj,
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123 void (*markobj) (Lisp_Object));
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124
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125 struct lrecord_implementation
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2
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126 {
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412
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127 CONST char *name;
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128 /* This function is called at GC time, to make sure that all Lisp_Objects
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129 pointed to by this object get properly marked. It should call
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130 the mark_object function on all Lisp_Objects in the object. If
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131 the return value is non-nil, it should be a Lisp_Object to be
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132 marked (don't call the mark_object function explicitly on it,
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133 because the GC routines will do this). Doing it this way reduces
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134 recursion, so the object returned should preferably be the one
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135 with the deepest level of Lisp_Object pointers. This function
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136 can be NULL, meaning no GC marking is necessary. */
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412
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137 Lisp_Object (*marker) (Lisp_Object, void (*mark_object) (Lisp_Object));
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138 /* This can be NULL if the object is an lcrecord; the
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139 default_object_printer() in print.c will be used. */
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2
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140 void (*printer) (Lisp_Object, Lisp_Object printcharfun, int escapeflag);
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412
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141 /* This function is called at GC time when the object is about to
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2
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142 be freed, and at dump time (FOR_DISKSAVE will be non-zero in this
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143 case). It should perform any necessary cleanup (e.g. freeing
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412
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144 malloc()ed memory. This can be NULL, meaning no special
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145 finalization is necessary.
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185
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146
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412
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147 WARNING: remember that the finalizer is called at dump time even
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2
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148 though the object is not being freed. */
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149 void (*finalizer) (void *header, int for_disksave);
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150 /* This can be NULL, meaning compare objects with EQ(). */
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151 int (*equal) (Lisp_Object obj1, Lisp_Object obj2, int depth);
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412
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152 /* This can be NULL, meaning use the Lisp_Object itself as the hash;
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153 but *only* if the `equal' function is EQ (if two objects are
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154 `equal', they *must* hash to the same value or the hashing won't
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155 work). */
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2
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156 unsigned long (*hash) (Lisp_Object, int);
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420
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157
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158 /* External data layout description */
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159 const struct lrecord_description *description;
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160
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2
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161 Lisp_Object (*getprop) (Lisp_Object obj, Lisp_Object prop);
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162 int (*putprop) (Lisp_Object obj, Lisp_Object prop, Lisp_Object val);
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163 int (*remprop) (Lisp_Object obj, Lisp_Object prop);
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164 Lisp_Object (*plist) (Lisp_Object obj);
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0
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165
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412
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166 /* Only one of these is non-0. If both are 0, it means that this type
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167 is not instantiable by alloc_lcrecord(). */
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272
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168 size_t static_size;
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412
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169 size_t (*size_in_bytes_method) (CONST void *header);
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170 /* A unique subtag-code (dynamically) assigned to this datatype. */
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171 /* (This is a pointer so the rest of this structure can be read-only.) */
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172 int *lrecord_type_index;
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2
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173 /* A "basic" lrecord is any lrecord that's not an lcrecord, i.e.
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174 one that does not have an lcrecord_header at the front and which
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175 is (usually) allocated in frob blocks. We only use this flag for
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176 some consistency checking, and that only when error-checking is
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177 enabled. */
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412
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178 int basic_p;
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2
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179 };
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0
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180
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412
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181 extern CONST struct lrecord_implementation *lrecord_implementations_table[];
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211
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182
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398
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183 #define XRECORD_LHEADER_IMPLEMENTATION(obj) \
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412
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184 (lrecord_implementations_table[XRECORD_LHEADER (obj)->type])
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185 #define LHEADER_IMPLEMENTATION(lh) (lrecord_implementations_table[(lh)->type])
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211
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186
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187 extern int gc_in_progress;
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188
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420
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189 #define MARKED_RECORD_P(obj) (gc_in_progress && XRECORD_LHEADER (obj)->mark)
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190 #define MARKED_RECORD_HEADER_P(lheader) ((lheader)->mark)
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191 #define MARK_RECORD_HEADER(lheader) ((void) ((lheader)->mark = 1))
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192 #define UNMARK_RECORD_HEADER(lheader) ((void) ((lheader)->mark = 0))
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398
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193
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412
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194 #define UNMARKABLE_RECORD_HEADER_P(lheader) \
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195 (LHEADER_IMPLEMENTATION (lheader)->marker == this_one_is_unmarkable)
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398
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196
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420
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197 #define C_READONLY_RECORD_HEADER_P(lheader) ((lheader)->c_readonly)
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198 #define LISP_READONLY_RECORD_HEADER_P(lheader) ((lheader)->lisp_readonly)
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412
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199 #define SET_C_READONLY_RECORD_HEADER(lheader) \
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200 ((void) ((lheader)->c_readonly = (lheader)->lisp_readonly = 1))
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412
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201 #define SET_LISP_READONLY_RECORD_HEADER(lheader) \
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202 ((void) ((lheader)->lisp_readonly = 1))
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203
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204 /* External description stuff
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205
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206 A lrecord external description is an array of values. The first
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207 value of each line is a type, the second the offset in the lrecord
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208 structure. Following values are parameters, their presence, type
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209 and number is type-dependant.
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210
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211 The description ends with a "XD_END" record.
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212
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213 Some example descriptions :
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214 static const struct lrecord_description cons_description[] = {
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215 { XD_LISP_OBJECT, offsetof(struct Lisp_Cons, car), 2 },
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216 { XD_END }
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217 };
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218
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219 Which means "two lisp objects starting at the 'car' element"
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220
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221 static const struct lrecord_description string_description[] = {
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222 { XD_STRING_DATA, offsetof(Lisp_String, data) },
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223 { XD_LISP_OBJECT, offsetof(Lisp_String, plist), 1 },
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224 { XD_END }
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225 };
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226 "A string data pointer at 'data', one lisp object at 'plist'"
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227
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228 The existing types :
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229 XD_LISP_OBJECT
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230 Lisp objects. The third element is the count. This is also the type to use
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231 for pointers to other lrecords.
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232
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233 XD_STRING_DATA
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234 Pointer to string data.
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235
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236 XD_OPAQUE_PTR
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237 Pointer to undumpable data. Must be NULL when dumping.
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238
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239 XD_STRUCT_PTR
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240 Pointer to described struct. Parameters are number of structures and
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241 struct_description.
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242
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243 XD_OPAQUE_DATA_PTR
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244 Pointer to dumpable opaque data. Parameter is the size of the data.
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245 Pointed data must be relocatable without changes.
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246
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247 XD_SIZE_T
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248 size_t value. Used for counts.
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249
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250 XD_INT
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251 int value. Used for counts.
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252
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253 XD_LONG
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254 long value. Used for counts.
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255
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256 XD_END
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257 Special type indicating the end of the array.
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258
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259
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260 Special macros:
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261 XD_INDIRECT(line)
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262 Usable where a "count" or "size" is requested. Gives the value of the element
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263 which is at line number 'line' in the description (count starts at zero).
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264
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265 XD_PARENT_INDIRECT(line)
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266 Same as XD_INDIRECT but the element number refers to the parent structure.
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267 Usable only in struct descriptions.
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268 */
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269
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270 enum lrecord_description_type {
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271 XD_LISP_OBJECT,
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272 XD_STRING_DATA,
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273 XD_OPAQUE_PTR,
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274 XD_STRUCT_PTR,
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275 XD_OPAQUE_DATA_PTR,
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276 XD_SIZE_T,
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277 XD_INT,
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278 XD_LONG,
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279 XD_END
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280 };
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281
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282 struct lrecord_description {
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283 enum lrecord_description_type type;
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284 int offset;
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285 EMACS_INT data1;
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286 const struct struct_description *data2;
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287 };
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288
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289 struct struct_description {
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290 size_t size;
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291 const struct lrecord_description *description;
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292 };
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293
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294 #define XD_INDIRECT(count) (-1-(count))
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295 #define XD_PARENT_INDIRECT(count) (-1000-(count))
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296
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297 #define XD_DYNARR_DESC(base_type, sub_desc) \
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298 { XD_STRUCT_PTR, offsetof(base_type, base), XD_INDIRECT(1), sub_desc }, \
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299 { XD_INT, offsetof(base_type, max) }
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398
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300
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412
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301 /* Declaring the following structures as const puts them in the
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302 text (read-only) segment, which makes debugging inconvenient
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303 because this segment is not mapped when processing a core-
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304 dump file */
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398
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305
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412
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306 #ifdef DEBUG_XEMACS
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307 #define CONST_IF_NOT_DEBUG
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308 #else
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309 #define CONST_IF_NOT_DEBUG CONST
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310 #endif
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398
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311
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0
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312 /* DEFINE_LRECORD_IMPLEMENTATION is for objects with constant size.
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313 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION is for objects whose size varies.
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314 */
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315
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316 #if defined (ERROR_CHECK_TYPECHECK)
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317 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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318 #else
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319 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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320 #endif
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321
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420
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322 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,structtype) \
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323 DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,0,0,0,0,structtype)
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0
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324
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420
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325 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,structtype) \
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326 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,sizeof(structtype),0,1,structtype)
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0
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327
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420
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328 #define DEFINE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,structtype) \
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329 DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,0,0,0,0,structtype)
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398
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330
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420
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331 #define DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,structtype) \
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332 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,sizeof (structtype),0,0,structtype)
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272
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333
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420
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334 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,sizer,structtype) \
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335 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,0,0,0,0,sizer,structtype)
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272
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336
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420
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337 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,sizer,structtype) \
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338 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,0,sizer,0,structtype) \
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400
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339
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420
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340 #define MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,desc,getprop,putprop,remprop,props,size,sizer,basic_p,structtype) \
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412
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341 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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342 static int lrecord_##c_name##_lrecord_type_index; \
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343 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name = \
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420
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344 { name, marker, printer, nuker, equal, hash, desc, \
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412
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345 getprop, putprop, remprop, props, size, sizer, \
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346 &(lrecord_##c_name##_lrecord_type_index), basic_p } \
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400
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347
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412
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348 #define LRECORDP(a) (XTYPE ((a)) == Lisp_Type_Record)
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0
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349 #define XRECORD_LHEADER(a) ((struct lrecord_header *) XPNTR (a))
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211
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350
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398
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351 #define RECORD_TYPEP(x, ty) \
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412
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352 (LRECORDP (x) && \
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353 lrecord_implementations_table[XRECORD_LHEADER (x)->type] == (ty))
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0
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354
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355 /* NOTE: the DECLARE_LRECORD() must come before the associated
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356 DEFINE_LRECORD_*() or you will get compile errors.
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357
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358 Furthermore, you always need to put the DECLARE_LRECORD() in a header
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359 file, and make sure the header file is included in inline.c, even
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360 if the type is private to a particular file. Otherwise, you will
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361 get undefined references for the error_check_foo() inline function
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362 under GCC. */
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363
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364 #ifdef ERROR_CHECK_TYPECHECK
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365
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2
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366 # define DECLARE_LRECORD(c_name, structtype) \
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412
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367 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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368 lrecord_##c_name; \
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369 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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370 INLINE structtype * \
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380
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371 error_check_##c_name (Lisp_Object obj) \
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2
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372 { \
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412
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373 assert (RECORD_TYPEP (obj, &lrecord_##c_name) || \
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374 MARKED_RECORD_P (obj)); \
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380
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375 return (structtype *) XPNTR (obj); \
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2
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376 } \
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0
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377 extern Lisp_Object Q##c_name##p
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378
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2
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379 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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412
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380 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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381 INLINE structtype * \
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380
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382 error_check_##c_name (Lisp_Object obj) \
|
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2
|
383 { \
|
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412
|
384 assert (XGCTYPE (obj) == type_enum); \
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380
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385 return (structtype *) XPNTR (obj); \
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|
2
|
386 } \
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0
|
387 extern Lisp_Object Q##c_name##p
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388
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|
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389 # define XRECORD(x, c_name, structtype) error_check_##c_name (x)
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390 # define XNONRECORD(x, c_name, type_enum, structtype) error_check_##c_name (x)
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|
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391
|
|
2
|
392 # define XSETRECORD(var, p, c_name) do \
|
|
|
393 { \
|
|
185
|
394 XSETOBJ (var, Lisp_Type_Record, p); \
|
|
412
|
395 assert (RECORD_TYPEP (var, &lrecord_##c_name) || \
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|
|
396 MARKED_RECORD_P (var)); \
|
|
0
|
397 } while (0)
|
|
|
398
|
|
|
399 #else /* not ERROR_CHECK_TYPECHECK */
|
|
|
400
|
|
2
|
401 # define DECLARE_LRECORD(c_name, structtype) \
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|
|
402 extern Lisp_Object Q##c_name##p; \
|
|
412
|
403 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
|
|
|
404 lrecord_##c_name
|
|
2
|
405 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
|
|
0
|
406 extern Lisp_Object Q##c_name##p
|
|
|
407 # define XRECORD(x, c_name, structtype) ((structtype *) XPNTR (x))
|
|
2
|
408 # define XNONRECORD(x, c_name, type_enum, structtype) \
|
|
0
|
409 ((structtype *) XPNTR (x))
|
|
185
|
410 # define XSETRECORD(var, p, c_name) XSETOBJ (var, Lisp_Type_Record, p)
|
|
0
|
411
|
|
|
412 #endif /* not ERROR_CHECK_TYPECHECK */
|
|
|
413
|
|
412
|
414 #define RECORDP(x, c_name) RECORD_TYPEP (x, &lrecord_##c_name)
|
|
|
415 #define GC_RECORDP(x, c_name) gc_record_type_p (x, &lrecord_##c_name)
|
|
0
|
416
|
|
|
417 /* Note: we now have two different kinds of type-checking macros.
|
|
|
418 The "old" kind has now been renamed CONCHECK_foo. The reason for
|
|
|
419 this is that the CONCHECK_foo macros signal a continuable error,
|
|
185
|
420 allowing the user (through debug-on-error) to substitute a different
|
|
0
|
421 value and return from the signal, which causes the lvalue argument
|
|
|
422 to get changed. Quite a lot of code would crash if that happened,
|
|
|
423 because it did things like
|
|
|
424
|
|
|
425 foo = XCAR (list);
|
|
|
426 CHECK_STRING (foo);
|
|
|
427
|
|
|
428 and later on did XSTRING (XCAR (list)), assuming that the type
|
|
|
429 is correct (when it might be wrong, if the user substituted a
|
|
|
430 correct value in the debugger).
|
|
|
431
|
|
|
432 To get around this, I made all the CHECK_foo macros signal a
|
|
|
433 non-continuable error. Places where a continuable error is OK
|
|
|
434 (generally only when called directly on the argument of a Lisp
|
|
|
435 primitive) should be changed to use CONCHECK().
|
|
|
436
|
|
|
437 FSF Emacs does not have this problem because RMS took the cheesy
|
|
|
438 way out and disabled returning from a signal entirely. */
|
|
|
439
|
|
185
|
440 #define CONCHECK_RECORD(x, c_name) do { \
|
|
412
|
441 if (!RECORD_TYPEP (x, &lrecord_##c_name)) \
|
|
185
|
442 x = wrong_type_argument (Q##c_name##p, x); \
|
|
|
443 } while (0)
|
|
|
444 #define CONCHECK_NONRECORD(x, lisp_enum, predicate) do {\
|
|
|
445 if (XTYPE (x) != lisp_enum) \
|
|
|
446 x = wrong_type_argument (predicate, x); \
|
|
|
447 } while (0)
|
|
|
448 #define CHECK_RECORD(x, c_name) do { \
|
|
412
|
449 if (!RECORD_TYPEP (x, &lrecord_##c_name)) \
|
|
185
|
450 dead_wrong_type_argument (Q##c_name##p, x); \
|
|
|
451 } while (0)
|
|
|
452 #define CHECK_NONRECORD(x, lisp_enum, predicate) do { \
|
|
|
453 if (XTYPE (x) != lisp_enum) \
|
|
|
454 dead_wrong_type_argument (predicate, x); \
|
|
|
455 } while (0)
|
|
0
|
456
|
|
412
|
457 void *alloc_lcrecord (size_t size, CONST struct lrecord_implementation *);
|
|
0
|
458
|
|
185
|
459 #define alloc_lcrecord_type(type, lrecord_implementation) \
|
|
|
460 ((type *) alloc_lcrecord (sizeof (type), lrecord_implementation))
|
|
|
461
|
|
412
|
462 int gc_record_type_p (Lisp_Object frob,
|
|
|
463 CONST struct lrecord_implementation *type);
|
|
|
464
|
|
0
|
465 /* Copy the data from one lcrecord structure into another, but don't
|
|
|
466 overwrite the header information. */
|
|
|
467
|
|
2
|
468 #define copy_lcrecord(dst, src) \
|
|
412
|
469 memcpy ((char *) dst + sizeof (struct lcrecord_header), \
|
|
|
470 (char *) src + sizeof (struct lcrecord_header), \
|
|
|
471 sizeof (*dst) - sizeof (struct lcrecord_header))
|
|
0
|
472
|
|
2
|
473 #define zero_lcrecord(lcr) \
|
|
412
|
474 memset ((char *) lcr + sizeof (struct lcrecord_header), 0, \
|
|
|
475 sizeof (*lcr) - sizeof (struct lcrecord_header))
|
|
0
|
476
|
|
412
|
477 #endif /* _XEMACS_LRECORD_H_ */
|
