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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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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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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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211
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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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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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211
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49 at the top, which contains a `struct lrecord_header' and
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0
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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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0
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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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62 /* It would be better to put the mark-bit together with the
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63 following datatype identification field in an 8- or 16-bit
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64 integer rather than playing funny games with changing
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65 header->implementation and "wasting" 32 bits on the below
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66 pointer. The type-id would then be a 7 or 15 bit index into a
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67 table of lrecord-implementations rather than a direct pointer.
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68 There would be 24 (or 16) bits left over for datatype-specific
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69 per-instance flags.
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185
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70
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2
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71 The below is the simplest thing to do for the present,
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72 and doesn't incur that much overhead as most Emacs records
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73 are of such a size that the overhead isn't too bad.
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74 (The marker datatype is the worst case.)
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185
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75
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2
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76 It also has the very very very slight advantage that type-checking
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77 involves one memory read (of the "implementation" slot) and a
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78 comparison against a link-time constant address rather than a
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79 read and a comparison against a variable value. (Variable since
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80 it is a very good idea to assign the indices into the hypothetical
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81 type-code table dynamically rather that pre-defining them.)
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82 I think I remember that Elk Lisp does something like this.
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83 Gee, I wonder if some cretin has patented it? */
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211
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84
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85 /*
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86 * If USE_INDEXED_LRECORD_IMPLEMENTATION is defined, we are
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87 * implementing the scheme described in the 'It would be better
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88 * ...' paragraph above.
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89 */
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90 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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91 /* index into lrecord_implementations_table[] */
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380
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92 unsigned char type;
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211
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93 /* 1 if the object is marked during GC, 0 otherwise. */
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380
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94 char mark;
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272
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95 /* 1 if the object resides in pure (read-only) space */
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380
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96 char pure;
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211
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97 #else
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2
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98 CONST struct lrecord_implementation *implementation;
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211
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99 #endif
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2
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100 };
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211
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101
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243
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102 struct lrecord_implementation;
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103 int lrecord_type_index (CONST struct lrecord_implementation *implementation);
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272
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104
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105 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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380
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106 # define set_lheader_implementation(header,imp) do { \
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107 struct lrecord_header* SLI_header = (header); \
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108 (SLI_header)->type = lrecord_type_index (imp); \
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109 (SLI_header)->mark = 0; \
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110 (SLI_header)->pure = 0; \
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272
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111 } while (0)
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112 #else
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211
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113 # define set_lheader_implementation(header,imp) \
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272
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114 ((void) ((header)->implementation = (imp)))
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211
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115 #endif
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0
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116
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117 struct lcrecord_header
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2
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118 {
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119 struct lrecord_header lheader;
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380
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120
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121 /* The `next' field is normally used to chain all lrecords together
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2
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122 so that the GC can find (and free) all of them.
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380
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123 `alloc_lcrecord' threads records together.
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185
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124
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380
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125 The `next' field may be used for other purposes as long as some
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126 other mechanism is provided for letting the GC do its work.
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127
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128 For example, the event and marker object types allocate members
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129 out of memory chunks, and are able to find all unmarked members
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130 by sweeping through the elements of the list of chunks. */
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2
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131 struct lcrecord_header *next;
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380
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132
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133 /* The `uid' field is just for debugging/printing convenience.
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134 Having this slot doesn't hurt us much spacewise, since an
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135 lcrecord already has the above slots plus malloc overhead. */
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2
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136 unsigned int uid :31;
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380
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137
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138 /* The `free' field is a flag that indicates whether this lcrecord
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139 is on a "free list". Free lists are used to minimize the number
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140 of calls to malloc() when we're repeatedly allocating and freeing
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141 a number of the same sort of lcrecord. Lcrecords on a free list
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142 always get marked in a different fashion, so we can use this flag
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143 as a sanity check to make sure that free lists only have freed
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144 lcrecords and there are no freed lcrecords elsewhere. */
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2
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145 unsigned int free :1;
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146 };
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0
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147
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148 /* Used for lcrecords in an lcrecord-list. */
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149 struct free_lcrecord_header
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2
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150 {
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151 struct lcrecord_header lcheader;
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152 Lisp_Object chain;
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153 };
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0
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154
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185
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155 /* This as the value of lheader->implementation->finalizer
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380
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156 means that this record is already marked */
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272
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157 void this_marks_a_marked_record (void *, int);
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0
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158
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159 /* see alloc.c for an explanation */
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272
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160 Lisp_Object this_one_is_unmarkable (Lisp_Object obj,
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161 void (*markobj) (Lisp_Object));
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0
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162
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163 struct lrecord_implementation
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2
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164 {
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165 CONST char *name;
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166 /* This function is called at GC time, to make sure that all Lisp_Objects
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167 pointed to by this object get properly marked. It should call
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168 the mark_object function on all Lisp_Objects in the object. If
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169 the return value is non-nil, it should be a Lisp_Object to be
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170 marked (don't call the mark_object function explicitly on it,
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171 because the GC routines will do this). Doing it this way reduces
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172 recursion, so the object returned should preferably be the one
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173 with the deepest level of Lisp_Object pointers. This function
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174 can be NULL, meaning no GC marking is necessary. */
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175 Lisp_Object (*marker) (Lisp_Object, void (*mark_object) (Lisp_Object));
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176 /* This can be NULL if the object is an lcrecord; the
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177 default_object_printer() in print.c will be used. */
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178 void (*printer) (Lisp_Object, Lisp_Object printcharfun, int escapeflag);
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179 /* This function is called at GC time when the object is about to
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180 be freed, and at dump time (FOR_DISKSAVE will be non-zero in this
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181 case). It should perform any necessary cleanup (e.g. freeing
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182 malloc()ed memory. This can be NULL, meaning no special
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183 finalization is necessary.
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185
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184
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2
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185 WARNING: remember that the finalizer is called at dump time even
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186 though the object is not being freed. */
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187 void (*finalizer) (void *header, int for_disksave);
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188 /* This can be NULL, meaning compare objects with EQ(). */
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189 int (*equal) (Lisp_Object obj1, Lisp_Object obj2, int depth);
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190 /* This can be NULL, meaning use the Lisp_Object itself as the hash;
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191 but *only* if the `equal' function is EQ (if two objects are
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192 `equal', they *must* hash to the same value or the hashing won't
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193 work). */
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194 unsigned long (*hash) (Lisp_Object, int);
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195 Lisp_Object (*getprop) (Lisp_Object obj, Lisp_Object prop);
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196 int (*putprop) (Lisp_Object obj, Lisp_Object prop, Lisp_Object val);
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197 int (*remprop) (Lisp_Object obj, Lisp_Object prop);
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198 Lisp_Object (*plist) (Lisp_Object obj);
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0
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199
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2
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200 /* Only one of these is non-0. If both are 0, it means that this type
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201 is not instantiable by alloc_lcrecord(). */
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272
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202 size_t static_size;
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203 size_t (*size_in_bytes_method) (CONST void *header);
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2
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204 /* A unique subtag-code (dynamically) assigned to this datatype. */
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205 /* (This is a pointer so the rest of this structure can be read-only.) */
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206 int *lrecord_type_index;
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207 /* A "basic" lrecord is any lrecord that's not an lcrecord, i.e.
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208 one that does not have an lcrecord_header at the front and which
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209 is (usually) allocated in frob blocks. We only use this flag for
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210 some consistency checking, and that only when error-checking is
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211 enabled. */
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212 int basic_p;
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213 };
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0
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214
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272
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215 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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211
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216 extern CONST struct lrecord_implementation *lrecord_implementations_table[];
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217
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218 # define XRECORD_LHEADER_IMPLEMENTATION(obj) \
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219 (lrecord_implementations_table[XRECORD_LHEADER (obj)->type])
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220 # define LHEADER_IMPLEMENTATION(lh) (lrecord_implementations_table[(lh)->type])
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221 #else
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222 # define XRECORD_LHEADER_IMPLEMENTATION(obj) \
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223 (XRECORD_LHEADER (obj)->implementation)
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224 # define LHEADER_IMPLEMENTATION(lh) ((lh)->implementation)
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225 #endif
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226
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0
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227 extern int gc_in_progress;
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228
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211
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229 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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230 # define MARKED_RECORD_P(obj) (gc_in_progress && XRECORD_LHEADER (obj)->mark)
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231 #else
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272
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232 # define MARKED_RECORD_P(obj) (gc_in_progress && \
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233 XRECORD_LHEADER (obj)->implementation->finalizer == \
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0
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234 this_marks_a_marked_record)
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211
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235 #endif
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0
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236
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211
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237 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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207
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238
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380
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239 # define MARKED_RECORD_HEADER_P(lheader) ((lheader)->mark)
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240 # define MARK_RECORD_HEADER(lheader) ((void) ((lheader)->mark = 1))
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241 # define UNMARK_RECORD_HEADER(lheader) ((void) ((lheader)->mark = 0))
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211
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242
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243 #else /* ! USE_INDEXED_LRECORD_IMPLEMENTATION */
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244
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245 # define MARKED_RECORD_HEADER_P(lheader) \
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380
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246 ((lheader)->implementation->finalizer == this_marks_a_marked_record)
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247 # define MARK_RECORD_HEADER(lheader) ((void) (((lheader)->implementation)++))
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248 # define UNMARK_RECORD_HEADER(lheader) ((void) (((lheader)->implementation)--))
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207
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249
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211
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250 #endif /* ! USE_INDEXED_LRECORD_IMPLEMENTATION */
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251
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252 #define UNMARKABLE_RECORD_HEADER_P(lheader) \
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380
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253 (LHEADER_IMPLEMENTATION (lheader)->marker == this_one_is_unmarkable)
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207
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254
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0
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255 /* Declaring the following structures as const puts them in the
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256 text (read-only) segment, which makes debugging inconvenient
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257 because this segment is not mapped when processing a core-
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258 dump file */
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259
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260 #ifdef DEBUG_XEMACS
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261 #define CONST_IF_NOT_DEBUG
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262 #else
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263 #define CONST_IF_NOT_DEBUG CONST
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264 #endif
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265
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266 /* DEFINE_LRECORD_IMPLEMENTATION is for objects with constant size.
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267 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION is for objects whose size varies.
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268 */
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269
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270 #if defined (ERROR_CHECK_TYPECHECK)
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271 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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272 #else
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273 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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274 #endif
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275
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276 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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272
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277 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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278
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279 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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272
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280 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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281
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282 #define DEFINE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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272
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283 DEFINE_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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284
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285 #define DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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272
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286 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,sizeof (structtype),0,0,structtype)
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0
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287
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288 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,sizer,structtype) \
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272
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289 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,0,0,0,0,sizer,structtype)
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290
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291 #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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292 MAKE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,0,sizer,0,structtype) \
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293
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294 #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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0
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295 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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296 static int lrecord_##c_name##_lrecord_type_index; \
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297 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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298 { { name, marker, printer, nuker, equal, hash, \
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272
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299 getprop, putprop, remprop, props, size, sizer, \
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300 &(lrecord_##c_name##_lrecord_type_index), basic_p }, \
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301 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, basic_p } }
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0
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302
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185
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303 #define LRECORDP(a) (XTYPE ((a)) == Lisp_Type_Record)
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0
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304 #define XRECORD_LHEADER(a) ((struct lrecord_header *) XPNTR (a))
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211
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305
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306 #ifdef USE_INDEXED_LRECORD_IMPLEMENTATION
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307 # define RECORD_TYPEP(x, ty) \
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308 (LRECORDP (x) && \
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309 lrecord_implementations_table[XRECORD_LHEADER (x)->type] == (ty))
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310 #else
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311 # define RECORD_TYPEP(x, ty) \
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0
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312 (LRECORDP (x) && XRECORD_LHEADER (x)->implementation == (ty))
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211
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313 #endif
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0
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314
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315 /* NOTE: the DECLARE_LRECORD() must come before the associated
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316 DEFINE_LRECORD_*() or you will get compile errors.
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317
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318 Furthermore, you always need to put the DECLARE_LRECORD() in a header
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319 file, and make sure the header file is included in inline.c, even
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320 if the type is private to a particular file. Otherwise, you will
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321 get undefined references for the error_check_foo() inline function
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322 under GCC. */
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323
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324 #ifdef ERROR_CHECK_TYPECHECK
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325
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2
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326 # define DECLARE_LRECORD(c_name, structtype) \
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327 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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328 lrecord_##c_name[]; \
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380
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329 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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2
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330 INLINE structtype * \
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380
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331 error_check_##c_name (Lisp_Object obj) \
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2
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332 { \
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380
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333 XUNMARK (obj); \
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334 assert (RECORD_TYPEP (obj, lrecord_##c_name) || \
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335 MARKED_RECORD_P (obj)); \
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336 return (structtype *) XPNTR (obj); \
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2
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337 } \
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0
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338 extern Lisp_Object Q##c_name##p
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339
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2
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340 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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380
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341 INLINE structtype *error_check_##c_name (Lisp_Object obj); \
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2
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342 INLINE structtype * \
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380
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343 error_check_##c_name (Lisp_Object obj) \
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2
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344 { \
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380
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345 XUNMARK (obj); \
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346 assert (XGCTYPE (obj) == type_enum); \
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347 return (structtype *) XPNTR (obj); \
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2
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348 } \
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0
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349 extern Lisp_Object Q##c_name##p
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350
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351 # define XRECORD(x, c_name, structtype) error_check_##c_name (x)
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352 # define XNONRECORD(x, c_name, type_enum, structtype) error_check_##c_name (x)
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353
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2
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354 # define XSETRECORD(var, p, c_name) do \
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355 { \
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185
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356 XSETOBJ (var, Lisp_Type_Record, p); \
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2
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357 assert (RECORD_TYPEP (var, lrecord_##c_name) || \
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358 MARKED_RECORD_P (var)); \
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0
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359 } while (0)
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360
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361 #else /* not ERROR_CHECK_TYPECHECK */
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362
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2
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363 # define DECLARE_LRECORD(c_name, structtype) \
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364 extern Lisp_Object Q##c_name##p; \
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365 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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0
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366 lrecord_##c_name[]
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2
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367 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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0
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368 extern Lisp_Object Q##c_name##p
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369 # define XRECORD(x, c_name, structtype) ((structtype *) XPNTR (x))
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2
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370 # define XNONRECORD(x, c_name, type_enum, structtype) \
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0
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371 ((structtype *) XPNTR (x))
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185
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372 # define XSETRECORD(var, p, c_name) XSETOBJ (var, Lisp_Type_Record, p)
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0
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373
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374 #endif /* not ERROR_CHECK_TYPECHECK */
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375
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376 #define RECORDP(x, c_name) RECORD_TYPEP (x, lrecord_##c_name)
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377 #define GC_RECORDP(x, c_name) gc_record_type_p (x, lrecord_##c_name)
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378
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379 /* Note: we now have two different kinds of type-checking macros.
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380 The "old" kind has now been renamed CONCHECK_foo. The reason for
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381 this is that the CONCHECK_foo macros signal a continuable error,
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185
|
382 allowing the user (through debug-on-error) to substitute a different
|
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0
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383 value and return from the signal, which causes the lvalue argument
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384 to get changed. Quite a lot of code would crash if that happened,
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385 because it did things like
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386
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387 foo = XCAR (list);
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388 CHECK_STRING (foo);
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389
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390 and later on did XSTRING (XCAR (list)), assuming that the type
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391 is correct (when it might be wrong, if the user substituted a
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|
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392 correct value in the debugger).
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393
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394 To get around this, I made all the CHECK_foo macros signal a
|
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395 non-continuable error. Places where a continuable error is OK
|
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396 (generally only when called directly on the argument of a Lisp
|
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397 primitive) should be changed to use CONCHECK().
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|
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398
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|
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399 FSF Emacs does not have this problem because RMS took the cheesy
|
|
|
400 way out and disabled returning from a signal entirely. */
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401
|
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185
|
402 #define CONCHECK_RECORD(x, c_name) do { \
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|
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403 if (!RECORD_TYPEP (x, lrecord_##c_name)) \
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404 x = wrong_type_argument (Q##c_name##p, x); \
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|
|
405 } while (0)
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|
|
406 #define CONCHECK_NONRECORD(x, lisp_enum, predicate) do {\
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|
|
407 if (XTYPE (x) != lisp_enum) \
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|
|
408 x = wrong_type_argument (predicate, x); \
|
|
|
409 } while (0)
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|
|
410 #define CHECK_RECORD(x, c_name) do { \
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|
|
411 if (!RECORD_TYPEP (x, lrecord_##c_name)) \
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|
|
412 dead_wrong_type_argument (Q##c_name##p, x); \
|
|
|
413 } while (0)
|
|
|
414 #define CHECK_NONRECORD(x, lisp_enum, predicate) do { \
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|
|
415 if (XTYPE (x) != lisp_enum) \
|
|
|
416 dead_wrong_type_argument (predicate, x); \
|
|
|
417 } while (0)
|
|
0
|
418
|
|
272
|
419 void *alloc_lcrecord (size_t size, CONST struct lrecord_implementation *);
|
|
0
|
420
|
|
185
|
421 #define alloc_lcrecord_type(type, lrecord_implementation) \
|
|
|
422 ((type *) alloc_lcrecord (sizeof (type), lrecord_implementation))
|
|
|
423
|
|
0
|
424 int gc_record_type_p (Lisp_Object frob,
|
|
|
425 CONST struct lrecord_implementation *type);
|
|
|
426
|
|
|
427 /* Copy the data from one lcrecord structure into another, but don't
|
|
|
428 overwrite the header information. */
|
|
|
429
|
|
2
|
430 #define copy_lcrecord(dst, src) \
|
|
|
431 memcpy ((char *) dst + sizeof (struct lcrecord_header), \
|
|
|
432 (char *) src + sizeof (struct lcrecord_header), \
|
|
0
|
433 sizeof (*dst) - sizeof (struct lcrecord_header))
|
|
|
434
|
|
2
|
435 #define zero_lcrecord(lcr) \
|
|
|
436 memset ((char *) lcr + sizeof (struct lcrecord_header), 0, \
|
|
0
|
437 sizeof (*lcr) - sizeof (struct lcrecord_header))
|
|
|
438
|
|
|
439 #endif /* _XEMACS_LRECORD_H_ */
|
