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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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0
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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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0
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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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0
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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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412
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63 unsigned char type;
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64 struct {
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65 /* 1 if the object is marked during GC. */
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66 unsigned mark :1;
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67 /* 1 if the object resides in read-only space */
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68 unsigned c_readonly : 1;
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69 /* 1 if the object is readonly from lisp */
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70 unsigned lisp_readonly : 1;
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71 } flags;
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2
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72 };
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211
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73
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243
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74 struct lrecord_implementation;
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412
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75 int lrecord_type_index (CONST struct lrecord_implementation *implementation);
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272
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76
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412
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77 # define set_lheader_implementation(header,imp) do { \
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380
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78 struct lrecord_header* SLI_header = (header); \
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412
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79 (SLI_header)->type = lrecord_type_index (imp); \
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80 (SLI_header)->flags.mark = 0; \
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81 (SLI_header)->flags.c_readonly = 0; \
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82 (SLI_header)->flags.lisp_readonly = 0; \
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272
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83 } while (0)
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0
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84
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85 struct lcrecord_header
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2
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86 {
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87 struct lrecord_header lheader;
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380
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88
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412
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89 /* The `next' field is normally used to chain all lrecords together
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90 so that the GC can find (and free) all of them.
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412
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91 `alloc_lcrecord' threads records together.
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185
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92
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380
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93 The `next' field may be used for other purposes as long as some
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94 other mechanism is provided for letting the GC do its work.
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95
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96 For example, the event and marker object types allocate members
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97 out of memory chunks, and are able to find all unmarked members
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98 by sweeping through the elements of the list of chunks. */
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2
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99 struct lcrecord_header *next;
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380
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100
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101 /* The `uid' field is just for debugging/printing convenience.
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102 Having this slot doesn't hurt us much spacewise, since an
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103 lcrecord already has the above slots plus malloc overhead. */
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2
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104 unsigned int uid :31;
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380
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105
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106 /* The `free' field is a flag that indicates whether this lcrecord
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107 is on a "free list". Free lists are used to minimize the number
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108 of calls to malloc() when we're repeatedly allocating and freeing
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109 a number of the same sort of lcrecord. Lcrecords on a free list
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110 always get marked in a different fashion, so we can use this flag
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111 as a sanity check to make sure that free lists only have freed
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112 lcrecords and there are no freed lcrecords elsewhere. */
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2
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113 unsigned int free :1;
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114 };
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115
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116 /* Used for lcrecords in an lcrecord-list. */
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117 struct free_lcrecord_header
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2
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118 {
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119 struct lcrecord_header lcheader;
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120 Lisp_Object chain;
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121 };
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122
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412
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123 /* see alloc.c for an explanation */
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124 Lisp_Object this_one_is_unmarkable (Lisp_Object obj,
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125 void (*markobj) (Lisp_Object));
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126
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127 struct lrecord_implementation
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2
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128 {
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412
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129 CONST char *name;
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130 /* This function is called at GC time, to make sure that all Lisp_Objects
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2
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131 pointed to by this object get properly marked. It should call
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132 the mark_object function on all Lisp_Objects in the object. If
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133 the return value is non-nil, it should be a Lisp_Object to be
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134 marked (don't call the mark_object function explicitly on it,
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135 because the GC routines will do this). Doing it this way reduces
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136 recursion, so the object returned should preferably be the one
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137 with the deepest level of Lisp_Object pointers. This function
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138 can be NULL, meaning no GC marking is necessary. */
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412
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139 Lisp_Object (*marker) (Lisp_Object, void (*mark_object) (Lisp_Object));
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140 /* This can be NULL if the object is an lcrecord; the
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141 default_object_printer() in print.c will be used. */
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2
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142 void (*printer) (Lisp_Object, Lisp_Object printcharfun, int escapeflag);
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412
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143 /* This function is called at GC time when the object is about to
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2
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144 be freed, and at dump time (FOR_DISKSAVE will be non-zero in this
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145 case). It should perform any necessary cleanup (e.g. freeing
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412
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146 malloc()ed memory. This can be NULL, meaning no special
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147 finalization is necessary.
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185
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148
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412
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149 WARNING: remember that the finalizer is called at dump time even
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2
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150 though the object is not being freed. */
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151 void (*finalizer) (void *header, int for_disksave);
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152 /* This can be NULL, meaning compare objects with EQ(). */
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153 int (*equal) (Lisp_Object obj1, Lisp_Object obj2, int depth);
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412
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154 /* This can be NULL, meaning use the Lisp_Object itself as the hash;
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155 but *only* if the `equal' function is EQ (if two objects are
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156 `equal', they *must* hash to the same value or the hashing won't
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157 work). */
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2
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158 unsigned long (*hash) (Lisp_Object, int);
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159 Lisp_Object (*getprop) (Lisp_Object obj, Lisp_Object prop);
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160 int (*putprop) (Lisp_Object obj, Lisp_Object prop, Lisp_Object val);
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161 int (*remprop) (Lisp_Object obj, Lisp_Object prop);
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162 Lisp_Object (*plist) (Lisp_Object obj);
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0
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163
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412
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164 /* Only one of these is non-0. If both are 0, it means that this type
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165 is not instantiable by alloc_lcrecord(). */
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272
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166 size_t static_size;
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412
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167 size_t (*size_in_bytes_method) (CONST void *header);
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168 /* A unique subtag-code (dynamically) assigned to this datatype. */
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169 /* (This is a pointer so the rest of this structure can be read-only.) */
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170 int *lrecord_type_index;
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2
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171 /* A "basic" lrecord is any lrecord that's not an lcrecord, i.e.
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172 one that does not have an lcrecord_header at the front and which
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173 is (usually) allocated in frob blocks. We only use this flag for
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174 some consistency checking, and that only when error-checking is
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175 enabled. */
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412
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176 int basic_p;
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2
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177 };
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0
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178
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412
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179 extern CONST struct lrecord_implementation *lrecord_implementations_table[];
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211
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180
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398
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181 #define XRECORD_LHEADER_IMPLEMENTATION(obj) \
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412
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182 (lrecord_implementations_table[XRECORD_LHEADER (obj)->type])
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183 #define LHEADER_IMPLEMENTATION(lh) (lrecord_implementations_table[(lh)->type])
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211
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184
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0
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185 extern int gc_in_progress;
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186
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412
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187 #define MARKED_RECORD_P(obj) (gc_in_progress && XRECORD_LHEADER (obj)->flags.mark)
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188 #define MARKED_RECORD_HEADER_P(lheader) ((lheader)->flags.mark)
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189 #define MARK_RECORD_HEADER(lheader) ((void) ((lheader)->flags.mark = 1))
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190 #define UNMARK_RECORD_HEADER(lheader) ((void) ((lheader)->flags.mark = 0))
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398
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191
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412
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192 #define UNMARKABLE_RECORD_HEADER_P(lheader) \
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193 (LHEADER_IMPLEMENTATION (lheader)->marker == this_one_is_unmarkable)
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398
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194
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412
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195 #define C_READONLY_RECORD_HEADER_P(lheader) ((lheader)->flags.c_readonly)
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196 #define LISP_READONLY_RECORD_HEADER_P(lheader) ((lheader)->flags.lisp_readonly)
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197 #define SET_C_READONLY_RECORD_HEADER(lheader) \
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198 ((void) ((lheader)->flags.c_readonly = (lheader)->flags.lisp_readonly = 1))
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199 #define SET_LISP_READONLY_RECORD_HEADER(lheader) \
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200 ((void) ((lheader)->flags.lisp_readonly = 1))
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398
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201
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412
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202 /* Declaring the following structures as const puts them in the
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203 text (read-only) segment, which makes debugging inconvenient
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204 because this segment is not mapped when processing a core-
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205 dump file */
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398
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206
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412
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207 #ifdef DEBUG_XEMACS
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208 #define CONST_IF_NOT_DEBUG
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209 #else
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210 #define CONST_IF_NOT_DEBUG CONST
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211 #endif
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398
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212
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0
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213 /* DEFINE_LRECORD_IMPLEMENTATION is for objects with constant size.
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214 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION is for objects whose size varies.
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215 */
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216
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217 #if defined (ERROR_CHECK_TYPECHECK)
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218 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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219 #else
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220 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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221 #endif
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222
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412
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223 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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224 DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,0,0,0,0,structtype)
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0
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225
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412
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226 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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227 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,sizeof(structtype),0,1,structtype)
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0
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228
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412
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229 #define DEFINE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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230 DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,0,0,0,0,structtype)
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398
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231
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412
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232 #define DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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233 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,sizeof (structtype),0,0,structtype)
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272
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234
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412
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235 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,sizer,structtype) \
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236 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,0,0,0,0,sizer,structtype)
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272
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237
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412
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238 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,sizer,structtype) \
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239 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,0,sizer,0,structtype) \
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400
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240
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412
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241 #define MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,size,sizer,basic_p,structtype) \
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242 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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243 static int lrecord_##c_name##_lrecord_type_index; \
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244 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name = \
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245 { name, marker, printer, nuker, equal, hash, \
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246 getprop, putprop, remprop, props, size, sizer, \
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247 &(lrecord_##c_name##_lrecord_type_index), basic_p } \
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400
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248
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412
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249 #define LRECORDP(a) (XTYPE ((a)) == Lisp_Type_Record)
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0
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250 #define XRECORD_LHEADER(a) ((struct lrecord_header *) XPNTR (a))
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211
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251
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398
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252 #define RECORD_TYPEP(x, ty) \
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412
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253 (LRECORDP (x) && \
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254 lrecord_implementations_table[XRECORD_LHEADER (x)->type] == (ty))
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0
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255
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256 /* NOTE: the DECLARE_LRECORD() must come before the associated
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257 DEFINE_LRECORD_*() or you will get compile errors.
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258
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259 Furthermore, you always need to put the DECLARE_LRECORD() in a header
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260 file, and make sure the header file is included in inline.c, even
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261 if the type is private to a particular file. Otherwise, you will
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262 get undefined references for the error_check_foo() inline function
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263 under GCC. */
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264
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265 #ifdef ERROR_CHECK_TYPECHECK
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266
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2
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267 # define DECLARE_LRECORD(c_name, structtype) \
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412
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268 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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269 lrecord_##c_name; \
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270 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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271 INLINE structtype * \
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380
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272 error_check_##c_name (Lisp_Object obj) \
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2
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273 { \
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412
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274 assert (RECORD_TYPEP (obj, &lrecord_##c_name) || \
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275 MARKED_RECORD_P (obj)); \
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380
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276 return (structtype *) XPNTR (obj); \
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2
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277 } \
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0
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278 extern Lisp_Object Q##c_name##p
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279
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2
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280 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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412
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281 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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282 INLINE structtype * \
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380
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283 error_check_##c_name (Lisp_Object obj) \
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2
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284 { \
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412
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285 assert (XGCTYPE (obj) == type_enum); \
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380
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286 return (structtype *) XPNTR (obj); \
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2
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287 } \
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0
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288 extern Lisp_Object Q##c_name##p
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289
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290 # define XRECORD(x, c_name, structtype) error_check_##c_name (x)
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291 # define XNONRECORD(x, c_name, type_enum, structtype) error_check_##c_name (x)
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292
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2
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293 # define XSETRECORD(var, p, c_name) do \
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294 { \
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185
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295 XSETOBJ (var, Lisp_Type_Record, p); \
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412
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296 assert (RECORD_TYPEP (var, &lrecord_##c_name) || \
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297 MARKED_RECORD_P (var)); \
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0
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298 } while (0)
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299
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300 #else /* not ERROR_CHECK_TYPECHECK */
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301
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2
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302 # define DECLARE_LRECORD(c_name, structtype) \
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303 extern Lisp_Object Q##c_name##p; \
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412
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304 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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305 lrecord_##c_name
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2
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306 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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0
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307 extern Lisp_Object Q##c_name##p
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308 # define XRECORD(x, c_name, structtype) ((structtype *) XPNTR (x))
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2
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309 # define XNONRECORD(x, c_name, type_enum, structtype) \
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0
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310 ((structtype *) XPNTR (x))
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185
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311 # define XSETRECORD(var, p, c_name) XSETOBJ (var, Lisp_Type_Record, p)
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0
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312
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313 #endif /* not ERROR_CHECK_TYPECHECK */
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314
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412
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315 #define RECORDP(x, c_name) RECORD_TYPEP (x, &lrecord_##c_name)
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316 #define GC_RECORDP(x, c_name) gc_record_type_p (x, &lrecord_##c_name)
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0
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317
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318 /* Note: we now have two different kinds of type-checking macros.
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319 The "old" kind has now been renamed CONCHECK_foo. The reason for
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320 this is that the CONCHECK_foo macros signal a continuable error,
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185
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321 allowing the user (through debug-on-error) to substitute a different
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0
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322 value and return from the signal, which causes the lvalue argument
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323 to get changed. Quite a lot of code would crash if that happened,
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324 because it did things like
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325
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326 foo = XCAR (list);
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327 CHECK_STRING (foo);
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328
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329 and later on did XSTRING (XCAR (list)), assuming that the type
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330 is correct (when it might be wrong, if the user substituted a
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331 correct value in the debugger).
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332
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333 To get around this, I made all the CHECK_foo macros signal a
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334 non-continuable error. Places where a continuable error is OK
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335 (generally only when called directly on the argument of a Lisp
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336 primitive) should be changed to use CONCHECK().
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337
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338 FSF Emacs does not have this problem because RMS took the cheesy
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339 way out and disabled returning from a signal entirely. */
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340
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185
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341 #define CONCHECK_RECORD(x, c_name) do { \
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412
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342 if (!RECORD_TYPEP (x, &lrecord_##c_name)) \
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185
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343 x = wrong_type_argument (Q##c_name##p, x); \
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344 } while (0)
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345 #define CONCHECK_NONRECORD(x, lisp_enum, predicate) do {\
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346 if (XTYPE (x) != lisp_enum) \
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347 x = wrong_type_argument (predicate, x); \
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348 } while (0)
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349 #define CHECK_RECORD(x, c_name) do { \
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412
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350 if (!RECORD_TYPEP (x, &lrecord_##c_name)) \
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185
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351 dead_wrong_type_argument (Q##c_name##p, x); \
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352 } while (0)
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353 #define CHECK_NONRECORD(x, lisp_enum, predicate) do { \
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354 if (XTYPE (x) != lisp_enum) \
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355 dead_wrong_type_argument (predicate, x); \
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356 } while (0)
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0
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357
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412
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358 void *alloc_lcrecord (size_t size, CONST struct lrecord_implementation *);
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0
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359
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185
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360 #define alloc_lcrecord_type(type, lrecord_implementation) \
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361 ((type *) alloc_lcrecord (sizeof (type), lrecord_implementation))
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362
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412
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363 int gc_record_type_p (Lisp_Object frob,
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364 CONST struct lrecord_implementation *type);
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365
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0
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366 /* Copy the data from one lcrecord structure into another, but don't
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367 overwrite the header information. */
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368
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2
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369 #define copy_lcrecord(dst, src) \
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412
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370 memcpy ((char *) dst + sizeof (struct lcrecord_header), \
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371 (char *) src + sizeof (struct lcrecord_header), \
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372 sizeof (*dst) - sizeof (struct lcrecord_header))
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0
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373
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2
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374 #define zero_lcrecord(lcr) \
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412
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375 memset ((char *) lcr + sizeof (struct lcrecord_header), 0, \
|
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376 sizeof (*lcr) - sizeof (struct lcrecord_header))
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0
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377
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412
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378 #endif /* _XEMACS_LRECORD_H_ */
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