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1 /* Opaque Lisp objects.
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2 Copyright (C) 1993, 1994, 1995 Sun Microsystems, Inc.
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3 Copyright (C) 1995, 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 /* Written by Ben Wing, October 1993. */
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25
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26 /* "Opaque" is used internally to hold keep track of allocated memory
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27 so it gets GC'd properly, and to store arbitrary data in places
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28 where a Lisp_Object is required and which may get GC'd. (e.g. as
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29 the argument to record_unwind_protect()). Once created in C,
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30 opaque objects cannot be resized.
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31
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32 OPAQUE OBJECTS SHOULD NEVER ESCAPE TO THE LISP LEVEL. Some code
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33 depends on this. As such, opaque objects are a generalization
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34 of the Qunbound marker.
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35
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36 "Opaque lists" are used to keep track of lots of opaque objects
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37 of a particular size so that they can be efficiently "freed" and
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38 re-used again without actually entering the Lisp allocation system
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39 (and consequently doing a malloc()).
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40 */
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41
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42 #include <config.h>
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43 #include "lisp.h"
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44 #include "opaque.h"
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45
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46 Lisp_Object Qopaquep;
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47
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48 static int in_opaque_list_marking;
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49
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50 /* Holds freed opaque objects created with make_opaque_ptr().
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51 We do this quite often so it's a noticeable win if we don't
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52 create GC junk. */
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53 Lisp_Object Vopaque_ptr_free_list;
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54
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55 static Lisp_Object mark_opaque (Lisp_Object, void (*) (Lisp_Object));
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56 static unsigned int sizeof_opaque (CONST void *header);
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57 static void print_opaque (Lisp_Object obj, Lisp_Object printcharfun,
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58 int escapeflag);
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59 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("opaque", opaque,
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60 mark_opaque, print_opaque, 0, 0, 0,
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61 sizeof_opaque, struct Lisp_Opaque);
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62
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63 static Lisp_Object
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64 mark_opaque (Lisp_Object obj, void (*markobj) (Lisp_Object))
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65 {
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66 #ifdef ERROR_CHECK_GC
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67 if (!in_opaque_list_marking)
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68 /* size is non-int for objects on an opaque free list. We sure
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69 as hell better not be marking any of these objects unless
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70 we're marking an opaque list. */
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71 assert (INTP (XOPAQUE (obj)->size_or_chain));
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72 else
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73 /* marking an opaque on the free list doesn't do any recursive
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74 markings, so we better not have non-freed opaques on a free
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75 list. */
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76 assert (!INTP (XOPAQUE (obj)->size_or_chain));
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77 #endif
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78 if (INTP (XOPAQUE (obj)->size_or_chain) && XOPAQUE_MARKFUN (obj))
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79 return (XOPAQUE_MARKFUN (obj)) (obj, markobj);
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80 else
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81 return XOPAQUE (obj)->size_or_chain;
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82 }
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83
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84 /* Should never, ever be called. (except by an external debugger) */
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85 static void
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86 print_opaque (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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87 {
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88 char buf[200];
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89 if (INTP (XOPAQUE (obj)->size_or_chain))
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90 sprintf (buf, "#<INTERNAL EMACS BUG (opaque, size=%d) 0x%x>",
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91 (EMACS_INT) XOPAQUE_SIZE (obj),
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92 (EMACS_INT) XPNTR (obj));
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93 else
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94 sprintf (buf, "#<INTERNAL EMACS BUG (opaque, freed) 0x%x>",
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95 (EMACS_INT) XPNTR (obj));
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96 write_c_string (buf, printcharfun);
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97 }
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98
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99 static unsigned int
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100 sizeof_opaque (CONST void *header)
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101 {
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102 CONST struct Lisp_Opaque *p = (CONST struct Lisp_Opaque *) header;
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103 if (!INTP (p->size_or_chain))
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104 return sizeof (*p);
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105 return sizeof (*p) + XINT (p->size_or_chain) - sizeof (int);
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106 }
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107
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108 Lisp_Object
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109 make_opaque (int size, CONST void *data)
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110 {
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111 struct Lisp_Opaque *p = alloc_lcrecord (sizeof (*p) + size - sizeof (int),
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112 lrecord_opaque);
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113 Lisp_Object val;
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114
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115 p->markfun = 0;
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116 p->size_or_chain = make_int (size);
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117 if (data)
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118 memcpy (p->data, data, size);
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119 else
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120 memset (p->data, 0, size);
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121 XSETOPAQUE (val, p);
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122 return val;
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123 }
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124
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125 static Lisp_Object mark_opaque_list (Lisp_Object, void (*) (Lisp_Object));
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126 DEFINE_LRECORD_IMPLEMENTATION ("opaque-list", opaque_list,
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127 mark_opaque_list, internal_object_printer,
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128 0, 0, 0, struct Lisp_Opaque_List);
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129
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130 static Lisp_Object
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131 mark_opaque_list (Lisp_Object obj, void (*markobj) (Lisp_Object))
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132 {
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133 in_opaque_list_marking++;
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134 (markobj) (XOPAQUE_LIST (obj)->free);
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135 in_opaque_list_marking--;
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136 return Qnil;
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137 }
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138
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139 Lisp_Object
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140 make_opaque_list (int size,
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141 Lisp_Object (*markfun) (Lisp_Object obj,
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142 void (*markobj) (Lisp_Object)))
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143 {
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144 struct Lisp_Opaque_List *p = alloc_lcrecord (sizeof (*p),
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145 lrecord_opaque_list);
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146 Lisp_Object val = Qnil;
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147
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148 p->markfun = markfun;
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149 p->size = size;
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150 p->free = Qnil;
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151 XSETOPAQUE_LIST (val, p);
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152 return val;
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153 }
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154
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155 Lisp_Object
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156 allocate_managed_opaque (Lisp_Object opaque_list, CONST void *data)
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157 {
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158 struct Lisp_Opaque_List *li = XOPAQUE_LIST (opaque_list);
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159 Lisp_Object val;
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160
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161 if (!NILP (li->free))
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162 {
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163 val = li->free;
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164 li->free = XOPAQUE (val)->size_or_chain;
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165 #ifdef ERROR_CHECK_GC
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166 assert (NILP (li->free) || OPAQUEP (li->free));
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167 #endif
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168 XOPAQUE (val)->size_or_chain = make_int (li->size);
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169 if (data)
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170 memcpy (XOPAQUE (val)->data, data, li->size);
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171 else
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172 memset (XOPAQUE (val)->data, 0, li->size);
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173 }
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174 else
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175 val = make_opaque (li->size, data);
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176 XOPAQUE (val)->markfun = li->markfun;
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177 return val;
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178 }
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179
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180 void
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181 free_managed_opaque (Lisp_Object opaque_list, Lisp_Object opaque)
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182 {
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183 struct Lisp_Opaque_List *li = XOPAQUE_LIST (opaque_list);
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184
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185 #ifdef ERROR_CHECK_GC
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186 assert (INTP (XOPAQUE (opaque)->size_or_chain));
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187 #endif
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188 XOPAQUE (opaque)->size_or_chain = li->free;
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189 li->free = opaque;
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190 }
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191
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192 /* stuff to handle opaque pointers */
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193
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194 Lisp_Object
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195 make_opaque_ptr (CONST void *val)
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196 {
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197 return allocate_managed_opaque (Vopaque_ptr_free_list,
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198 (CONST void *) &val);
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199 }
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200
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201 /* Be wery wery careful with this. Same admonitions as with
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202 free_cons() apply. */
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203
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204 void
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205 free_opaque_ptr (Lisp_Object ptr)
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206 {
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207 free_managed_opaque (Vopaque_ptr_free_list, ptr);
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208 }
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209
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210 Lisp_Object
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211 make_opaque_long (long val)
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212 {
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213 return make_opaque (sizeof (val), (void *) &val);
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214 }
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215
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216 void
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217 init_opaque_once_early (void)
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218 {
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219 Vopaque_ptr_free_list = make_opaque_list (sizeof (void *), 0);
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220 staticpro (&Vopaque_ptr_free_list);
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221 }
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