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428
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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
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37 #include <config.h>
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38 #include "lisp.h"
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39 #include "opaque.h"
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40
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41 Lisp_Object Vopaque_ptr_free_list;
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42
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43 /* Should never, ever be called. (except by an external debugger) */
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44 static void
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45 print_opaque (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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46 {
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442
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47 const Lisp_Opaque *p = XOPAQUE (obj);
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428
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48 char buf[200];
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49
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50 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (opaque, size=%lu) 0x%lx>",
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51 (long)(p->size), (unsigned long) p);
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52 write_c_string (buf, printcharfun);
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53 }
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54
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55 static size_t
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442
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56 sizeof_opaque (const void *header)
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428
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57 {
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442
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58 const Lisp_Opaque *p = (const Lisp_Opaque *) header;
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428
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59 return offsetof (Lisp_Opaque, data) + p->size;
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60 }
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61
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62 /* Return an opaque object of size SIZE.
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63 If DATA is OPAQUE_CLEAR, the object's data is memset to '\0' bytes.
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64 If DATA is OPAQUE_UNINIT, the object's data is uninitialized.
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65 Else the object's data is initialized by copying from DATA. */
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66 Lisp_Object
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442
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67 make_opaque (const void *data, size_t size)
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428
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68 {
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69 Lisp_Opaque *p = (Lisp_Opaque *)
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70 alloc_lcrecord (offsetof (Lisp_Opaque, data) + size, &lrecord_opaque);
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71 p->size = size;
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72
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73 if (data == OPAQUE_CLEAR)
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74 memset (p->data, '\0', size);
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75 else if (data == OPAQUE_UNINIT)
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76 DO_NOTHING;
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77 else
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78 memcpy (p->data, data, size);
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79
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80 {
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81 Lisp_Object val;
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82 XSETOPAQUE (val, p);
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83 return val;
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84 }
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85 }
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86
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87 /* This will not work correctly for opaques with subobjects! */
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88
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89 static int
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90 equal_opaque (Lisp_Object obj1, Lisp_Object obj2, int depth)
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91 {
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92 size_t size;
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93 return ((size = XOPAQUE_SIZE (obj1)) == XOPAQUE_SIZE (obj2) &&
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94 !memcmp (XOPAQUE_DATA (obj1), XOPAQUE_DATA (obj2), size));
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95 }
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96
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97 /* This will not work correctly for opaques with subobjects! */
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98
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99 static unsigned long
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100 hash_opaque (Lisp_Object obj, int depth)
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101 {
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102 if (XOPAQUE_SIZE (obj) == sizeof (unsigned long))
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103 return *((unsigned long *) XOPAQUE_DATA (obj));
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104 else
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105 return memory_hash (XOPAQUE_DATA (obj), XOPAQUE_SIZE (obj));
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106 }
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107
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108 static const struct lrecord_description opaque_description[] = {
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109 { XD_END }
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110 };
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111
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112 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION ("opaque", opaque,
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113 0, print_opaque, 0,
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114 equal_opaque, hash_opaque,
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115 opaque_description,
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116 sizeof_opaque, Lisp_Opaque);
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117
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118 /* stuff to handle opaque pointers */
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119
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120 /* Should never, ever be called. (except by an external debugger) */
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121 static void
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122 print_opaque_ptr (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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123 {
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442
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124 const Lisp_Opaque_Ptr *p = XOPAQUE_PTR (obj);
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428
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125 char buf[200];
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126
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442
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127 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (opaque-ptr, adr=0x%lx) 0x%lx>",
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428
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128 (long)(p->ptr), (unsigned long) p);
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129 write_c_string (buf, printcharfun);
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130 }
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131
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132 static int
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133 equal_opaque_ptr (Lisp_Object obj1, Lisp_Object obj2, int depth)
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134 {
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135 return (XOPAQUE_PTR (obj1)->ptr == XOPAQUE_PTR (obj2)->ptr);
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136 }
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137
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138 static unsigned long
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139 hash_opaque_ptr (Lisp_Object obj, int depth)
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140 {
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141 return (unsigned long) XOPAQUE_PTR (obj)->ptr;
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142 }
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143
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442
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144 DEFINE_LRECORD_IMPLEMENTATION ("opaque-ptr", opaque_ptr,
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428
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145 0, print_opaque_ptr, 0,
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146 equal_opaque_ptr, hash_opaque_ptr, 0,
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147 Lisp_Opaque_Ptr);
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148
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149 Lisp_Object
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150 make_opaque_ptr (void *val)
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151 {
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152 Lisp_Object res = allocate_managed_lcrecord(Vopaque_ptr_free_list);
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153 set_opaque_ptr (res, val);
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154 return res;
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155 }
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156
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157 /* Be very very careful with this. Same admonitions as with
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158 free_cons() apply. */
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159
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160 void
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161 free_opaque_ptr (Lisp_Object ptr)
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162 {
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163 free_managed_lcrecord (Vopaque_ptr_free_list, ptr);
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164 }
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165
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166 void
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167 reinit_opaque_once_early (void)
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168 {
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169 Vopaque_ptr_free_list = make_lcrecord_list (sizeof (Lisp_Opaque_Ptr), &lrecord_opaque_ptr);
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170 staticpro_nodump (&Vopaque_ptr_free_list);
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171 }
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172
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173 void
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174 init_opaque_once_early (void)
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175 {
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442
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176 INIT_LRECORD_IMPLEMENTATION (opaque);
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177 INIT_LRECORD_IMPLEMENTATION (opaque_ptr);
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178
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428
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179 reinit_opaque_once_early ();
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180 }
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