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0
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1 /* "intern" and friends -- moved here from lread.c and data.c
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2 Copyright (C) 1985-1989, 1992-1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995 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: FSF 19.30. */
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23
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24 /* This file has been Mule-ized. */
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25
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26 /* NOTE:
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27
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28 The value cell of a symbol can contain a simple value or one of
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29 various symbol-value-magic objects. Some of these objects can
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30 chain into other kinds of objects. Here is a table of possibilities:
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31
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32 1a) simple value
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33 1b) Qunbound
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34 1c) symbol-value-forward, excluding Qunbound
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35 2) symbol-value-buffer-local -> 1a or 1b or 1c
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36 3) symbol-value-lisp-magic -> 1a or 1b or 1c
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37 4) symbol-value-lisp-magic -> symbol-value-buffer-local -> 1a or 1b or 1c
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38 5) symbol-value-varalias
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39 6) symbol-value-lisp-magic -> symbol-value-varalias
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40
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41 The "chain" of a symbol-value-buffer-local is its current_value slot.
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42
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43 The "chain" of a symbol-value-lisp-magic is its shadowed slot, which
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44 applies for handler types without associated handlers.
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45
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46 All other fields in all the structures (including the "shadowed" slot
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47 in a symbol-value-varalias) can *only* contain a simple value or Qunbound.
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48
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49 */
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50
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51 /* #### Ugh, though, this file does awful things with symbol-value-magic
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52 objects. This ought to be cleaned up. */
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53
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54 #include <config.h>
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55 #include "lisp.h"
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56
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57 #include "buffer.h" /* for Vbuffer_defaults */
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58 #include "console.h"
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380
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59 #include "elhash.h"
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247
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60
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0
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61 Lisp_Object Qad_advice_info, Qad_activate;
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62
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63 Lisp_Object Qget_value, Qset_value, Qbound_predicate, Qmake_unbound;
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64 Lisp_Object Qlocal_predicate, Qmake_local;
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65
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412
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66 Lisp_Object Qboundp, Qfboundp, Qglobally_boundp, Qmakunbound;
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0
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67 Lisp_Object Qsymbol_value, Qset, Qdefault_boundp, Qdefault_value;
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380
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68 Lisp_Object Qset_default, Qsetq_default;
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69 Lisp_Object Qmake_variable_buffer_local, Qmake_local_variable;
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0
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70 Lisp_Object Qkill_local_variable, Qkill_console_local_variable;
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71 Lisp_Object Qsymbol_value_in_buffer, Qsymbol_value_in_console;
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72 Lisp_Object Qlocal_variable_p;
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73
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74 Lisp_Object Qconst_integer, Qconst_boolean, Qconst_object;
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75 Lisp_Object Qconst_specifier;
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76 Lisp_Object Qdefault_buffer, Qcurrent_buffer, Qconst_current_buffer;
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77 Lisp_Object Qdefault_console, Qselected_console, Qconst_selected_console;
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78
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79 static Lisp_Object maybe_call_magic_handler (Lisp_Object sym,
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80 Lisp_Object funsym,
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81 int nargs, ...);
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82 static Lisp_Object fetch_value_maybe_past_magic (Lisp_Object sym,
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380
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83 Lisp_Object follow_past_lisp_magic);
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0
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84 static Lisp_Object *value_slot_past_magic (Lisp_Object sym);
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380
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85 static Lisp_Object follow_varalias_pointers (Lisp_Object symbol,
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86 Lisp_Object follow_past_lisp_magic);
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0
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87
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88
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89 static Lisp_Object
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412
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90 mark_symbol (Lisp_Object obj, void (*markobj) (Lisp_Object))
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0
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91 {
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412
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92 struct Lisp_Symbol *sym = XSYMBOL (obj);
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0
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93 Lisp_Object pname;
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94
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412
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95 markobj (sym->value);
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96 markobj (sym->function);
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0
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97 XSETSTRING (pname, sym->name);
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412
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98 markobj (pname);
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0
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99 if (!symbol_next (sym))
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173
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100 return sym->plist;
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0
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101 else
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102 {
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412
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103 markobj (sym->plist);
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0
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104 /* Mark the rest of the symbols in the obarray hash-chain */
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105 sym = symbol_next (sym);
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106 XSETSYMBOL (obj, sym);
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173
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107 return obj;
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0
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108 }
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109 }
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110
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420
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111 static const struct lrecord_description symbol_description[] = {
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112 { XD_LISP_OBJECT, offsetof(struct Lisp_Symbol, next), 5 }
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113 };
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114
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412
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115 DEFINE_BASIC_LRECORD_IMPLEMENTATION ("symbol", symbol,
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116 mark_symbol, print_symbol, 0, 0, 0,
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420
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117 symbol_description, struct Lisp_Symbol);
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0
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118
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119
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120 /**********************************************************************/
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121 /* Intern */
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122 /**********************************************************************/
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123
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124 /* #### using a vector here is way bogus. Use a hash table instead. */
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125
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126 Lisp_Object Vobarray;
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127
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128 static Lisp_Object initial_obarray;
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129
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130 /* oblookup stores the bucket number here, for the sake of Funintern. */
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131
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132 static int oblookup_last_bucket_number;
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133
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134 static Lisp_Object
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135 check_obarray (Lisp_Object obarray)
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136 {
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173
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137 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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0
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138 {
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139 /* If Vobarray is now invalid, force it to be valid. */
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140 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
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141
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142 obarray = wrong_type_argument (Qvectorp, obarray);
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143 }
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144 return obarray;
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145 }
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146
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147 Lisp_Object
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412
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148 intern (CONST char *str)
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0
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149 {
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150 Bytecount len = strlen (str);
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412
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151 CONST Bufbyte *buf = (CONST Bufbyte *) str;
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0
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152 Lisp_Object obarray = Vobarray;
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380
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153
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173
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154 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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0
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155 obarray = check_obarray (obarray);
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380
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156
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157 {
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158 Lisp_Object tem = oblookup (obarray, buf, len);
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159 if (SYMBOLP (tem))
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160 return tem;
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161 }
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162
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398
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163 return Fintern (make_string (buf, len), obarray);
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0
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164 }
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165
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20
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166 DEFUN ("intern", Fintern, 1, 2, 0, /*
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0
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167 Return the canonical symbol whose name is STRING.
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168 If there is none, one is created by this function and returned.
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169 A second optional argument specifies the obarray to use;
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170 it defaults to the value of `obarray'.
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20
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171 */
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380
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172 (string, obarray))
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0
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173 {
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398
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174 Lisp_Object object, *ptr;
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412
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175 struct Lisp_Symbol *symbol;
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0
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176 Bytecount len;
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177
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178 if (NILP (obarray)) obarray = Vobarray;
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179 obarray = check_obarray (obarray);
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180
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380
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181 CHECK_STRING (string);
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182
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183 len = XSTRING_LENGTH (string);
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398
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184 object = oblookup (obarray, XSTRING_DATA (string), len);
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185 if (!INTP (object))
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0
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186 /* Found it */
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398
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187 return object;
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188
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189 ptr = &XVECTOR_DATA (obarray)[XINT (object)];
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190
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191 object = Fmake_symbol (string);
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192 symbol = XSYMBOL (object);
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0
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193
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194 if (SYMBOLP (*ptr))
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398
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195 symbol_next (symbol) = XSYMBOL (*ptr);
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0
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196 else
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398
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197 symbol_next (symbol) = 0;
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198 *ptr = object;
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199
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200 if (string_byte (symbol_name (symbol), 0) == ':' && EQ (obarray, Vobarray))
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201 {
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202 /* The LISP way is to put keywords in their own package, but we
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203 don't have packages, so we do something simpler. Someday,
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204 maybe we'll have packages and then this will be reworked.
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205 --Stig. */
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206 symbol_value (symbol) = object;
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207 }
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208
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209 return object;
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0
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210 }
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211
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20
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212 DEFUN ("intern-soft", Fintern_soft, 1, 2, 0, /*
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398
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213 Return the canonical symbol named NAME, or nil if none exists.
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214 NAME may be a string or a symbol. If it is a symbol, that exact
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215 symbol is searched for.
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0
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216 A second optional argument specifies the obarray to use;
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217 it defaults to the value of `obarray'.
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20
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218 */
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398
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219 (name, obarray))
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0
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220 {
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398
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221 /* #### Bug! (intern-soft "nil") returns nil. Perhaps we should
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222 add a DEFAULT-IF-NOT-FOUND arg, like in get. */
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0
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223 Lisp_Object tem;
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412
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224 struct Lisp_String *string;
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0
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225
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226 if (NILP (obarray)) obarray = Vobarray;
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227 obarray = check_obarray (obarray);
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228
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398
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229 if (!SYMBOLP (name))
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230 {
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231 CHECK_STRING (name);
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232 string = XSTRING (name);
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233 }
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234 else
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235 string = symbol_name (XSYMBOL (name));
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236
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237 tem = oblookup (obarray, string_data (string), string_length (string));
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238 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem)))
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239 return Qnil;
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240 else
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241 return tem;
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0
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242 }
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243
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20
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244 DEFUN ("unintern", Funintern, 1, 2, 0, /*
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0
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245 Delete the symbol named NAME, if any, from OBARRAY.
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246 The value is t if a symbol was found and deleted, nil otherwise.
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247 NAME may be a string or a symbol. If it is a symbol, that symbol
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248 is deleted, if it belongs to OBARRAY--no other symbol is deleted.
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249 OBARRAY defaults to the value of the variable `obarray'
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20
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250 */
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251 (name, obarray))
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0
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252 {
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398
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253 Lisp_Object tem;
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412
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254 struct Lisp_String *string;
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0
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255 int hash;
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256
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257 if (NILP (obarray)) obarray = Vobarray;
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258 obarray = check_obarray (obarray);
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259
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260 if (SYMBOLP (name))
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398
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261 string = symbol_name (XSYMBOL (name));
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0
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262 else
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263 {
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264 CHECK_STRING (name);
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398
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265 string = XSTRING (name);
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0
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266 }
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267
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398
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268 tem = oblookup (obarray, string_data (string), string_length (string));
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0
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269 if (INTP (tem))
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270 return Qnil;
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271 /* If arg was a symbol, don't delete anything but that symbol itself. */
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272 if (SYMBOLP (name) && !EQ (name, tem))
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273 return Qnil;
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274
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275 hash = oblookup_last_bucket_number;
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276
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173
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277 if (EQ (XVECTOR_DATA (obarray)[hash], tem))
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0
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278 {
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279 if (XSYMBOL (tem)->next)
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173
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280 XSETSYMBOL (XVECTOR_DATA (obarray)[hash], XSYMBOL (tem)->next);
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0
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281 else
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173
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282 XVECTOR_DATA (obarray)[hash] = Qzero;
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0
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283 }
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284 else
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285 {
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286 Lisp_Object tail, following;
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287
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173
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288 for (tail = XVECTOR_DATA (obarray)[hash];
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0
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289 XSYMBOL (tail)->next;
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290 tail = following)
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291 {
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292 XSETSYMBOL (following, XSYMBOL (tail)->next);
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293 if (EQ (following, tem))
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294 {
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295 XSYMBOL (tail)->next = XSYMBOL (following)->next;
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296 break;
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297 }
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298 }
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299 }
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300 return Qt;
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301 }
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302
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303 /* Return the symbol in OBARRAY whose names matches the string
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304 of SIZE characters at PTR. If there is no such symbol in OBARRAY,
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380
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305 return the index into OBARRAY that the string hashes to.
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0
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306
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307 Also store the bucket number in oblookup_last_bucket_number. */
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308
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309 Lisp_Object
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412
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310 oblookup (Lisp_Object obarray, CONST Bufbyte *ptr, Bytecount size)
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0
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311 {
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312 int hash, obsize;
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412
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313 struct Lisp_Symbol *tail;
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0
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314 Lisp_Object bucket;
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315
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316 if (!VECTORP (obarray) ||
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173
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317 (obsize = XVECTOR_LENGTH (obarray)) == 0)
|
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0
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318 {
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319 obarray = check_obarray (obarray);
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173
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320 obsize = XVECTOR_LENGTH (obarray);
|
|
0
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321 }
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380
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322 hash = hash_string (ptr, size) % obsize;
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323 oblookup_last_bucket_number = hash;
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173
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324 bucket = XVECTOR_DATA (obarray)[hash];
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0
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325 if (ZEROP (bucket))
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326 ;
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327 else if (!SYMBOLP (bucket))
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328 error ("Bad data in guts of obarray"); /* Like CADR error message */
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329 else
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330 for (tail = XSYMBOL (bucket); ;)
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331 {
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|
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332 if (string_length (tail->name) == size &&
|
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333 !memcmp (string_data (tail->name), ptr, size))
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334 {
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335 XSETSYMBOL (bucket, tail);
|
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173
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336 return bucket;
|
|
0
|
337 }
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338 tail = symbol_next (tail);
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339 if (!tail)
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340 break;
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|
|
341 }
|
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173
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342 return make_int (hash);
|
|
0
|
343 }
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344
|
|
100
|
345 #if 0 /* Emacs 19.34 */
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0
|
346 int
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412
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347 hash_string (CONST Bufbyte *ptr, Bytecount len)
|
|
0
|
348 {
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412
|
349 CONST Bufbyte *p = ptr;
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350 CONST Bufbyte *end = p + len;
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0
|
351 Bufbyte c;
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352 int hash = 0;
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353
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|
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354 while (p != end)
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355 {
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356 c = *p++;
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357 if (c >= 0140) c -= 40;
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358 hash = ((hash<<3) + (hash>>28) + c);
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|
|
359 }
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|
|
360 return hash & 07777777777;
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|
|
361 }
|
|
100
|
362 #endif
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|
|
363
|
|
|
364 /* derived from hashpjw, Dragon Book P436. */
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|
|
365 int
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|
412
|
366 hash_string (CONST Bufbyte *ptr, Bytecount len)
|
|
100
|
367 {
|
|
272
|
368 int hash = 0;
|
|
|
369
|
|
|
370 while (len-- > 0)
|
|
100
|
371 {
|
|
272
|
372 int g;
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|
|
373 hash = (hash << 4) + *ptr++;
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|
|
374 g = hash & 0xf0000000;
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|
|
375 if (g)
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|
|
376 hash = (hash ^ (g >> 24)) ^ g;
|
|
100
|
377 }
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|
|
378 return hash & 07777777777;
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|
|
379 }
|
|
0
|
380
|
|
227
|
381 /* Map FN over OBARRAY. The mapping is stopped when FN returns a
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|
|
382 non-zero value. */
|
|
0
|
383 void
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|
|
384 map_obarray (Lisp_Object obarray,
|
|
227
|
385 int (*fn) (Lisp_Object, void *), void *arg)
|
|
0
|
386 {
|
|
|
387 REGISTER int i;
|
|
227
|
388
|
|
0
|
389 CHECK_VECTOR (obarray);
|
|
173
|
390 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--)
|
|
0
|
391 {
|
|
272
|
392 Lisp_Object tail = XVECTOR_DATA (obarray)[i];
|
|
0
|
393 if (SYMBOLP (tail))
|
|
|
394 while (1)
|
|
|
395 {
|
|
412
|
396 struct Lisp_Symbol *next;
|
|
227
|
397 if ((*fn) (tail, arg))
|
|
|
398 return;
|
|
0
|
399 next = symbol_next (XSYMBOL (tail));
|
|
|
400 if (!next)
|
|
|
401 break;
|
|
|
402 XSETSYMBOL (tail, next);
|
|
|
403 }
|
|
|
404 }
|
|
|
405 }
|
|
|
406
|
|
227
|
407 static int
|
|
|
408 mapatoms_1 (Lisp_Object sym, void *arg)
|
|
0
|
409 {
|
|
227
|
410 call1 (*(Lisp_Object *)arg, sym);
|
|
|
411 return 0;
|
|
0
|
412 }
|
|
|
413
|
|
20
|
414 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /*
|
|
0
|
415 Call FUNCTION on every symbol in OBARRAY.
|
|
|
416 OBARRAY defaults to the value of `obarray'.
|
|
20
|
417 */
|
|
|
418 (function, obarray))
|
|
0
|
419 {
|
|
|
420 if (NILP (obarray))
|
|
|
421 obarray = Vobarray;
|
|
|
422 obarray = check_obarray (obarray);
|
|
|
423
|
|
227
|
424 map_obarray (obarray, mapatoms_1, &function);
|
|
0
|
425 return Qnil;
|
|
|
426 }
|
|
|
427
|
|
|
428
|
|
|
429 /**********************************************************************/
|
|
|
430 /* Apropos */
|
|
|
431 /**********************************************************************/
|
|
|
432
|
|
272
|
433 struct appropos_mapper_closure
|
|
|
434 {
|
|
227
|
435 Lisp_Object regexp;
|
|
|
436 Lisp_Object predicate;
|
|
|
437 Lisp_Object accumulation;
|
|
|
438 };
|
|
|
439
|
|
|
440 static int
|
|
|
441 apropos_mapper (Lisp_Object symbol, void *arg)
|
|
0
|
442 {
|
|
227
|
443 struct appropos_mapper_closure *closure =
|
|
272
|
444 (struct appropos_mapper_closure *) arg;
|
|
227
|
445 Bytecount match = fast_lisp_string_match (closure->regexp,
|
|
|
446 Fsymbol_name (symbol));
|
|
272
|
447
|
|
|
448 if (match >= 0 &&
|
|
|
449 (NILP (closure->predicate) ||
|
|
|
450 !NILP (call1 (closure->predicate, symbol))))
|
|
227
|
451 closure->accumulation = Fcons (symbol, closure->accumulation);
|
|
272
|
452
|
|
227
|
453 return 0;
|
|
0
|
454 }
|
|
|
455
|
|
20
|
456 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /*
|
|
0
|
457 Show all symbols whose names contain match for REGEXP.
|
|
241
|
458 If optional 2nd arg PREDICATE is non-nil, (funcall PREDICATE SYMBOL)
|
|
|
459 is done for each symbol and a symbol is mentioned only if that
|
|
|
460 returns non-nil.
|
|
0
|
461 Return list of symbols found.
|
|
20
|
462 */
|
|
227
|
463 (regexp, predicate))
|
|
0
|
464 {
|
|
227
|
465 struct appropos_mapper_closure closure;
|
|
|
466
|
|
|
467 CHECK_STRING (regexp);
|
|
|
468
|
|
|
469 closure.regexp = regexp;
|
|
|
470 closure.predicate = predicate;
|
|
|
471 closure.accumulation = Qnil;
|
|
|
472 map_obarray (Vobarray, apropos_mapper, &closure);
|
|
|
473 closure.accumulation = Fsort (closure.accumulation, Qstring_lessp);
|
|
|
474 return closure.accumulation;
|
|
0
|
475 }
|
|
|
476
|
|
|
477
|
|
|
478 /* Extract and set components of symbols */
|
|
|
479
|
|
173
|
480 static void set_up_buffer_local_cache (Lisp_Object sym,
|
|
0
|
481 struct symbol_value_buffer_local *bfwd,
|
|
82
|
482 struct buffer *buf,
|
|
|
483 Lisp_Object new_alist_el,
|
|
|
484 int set_it_p);
|
|
0
|
485
|
|
20
|
486 DEFUN ("boundp", Fboundp, 1, 1, 0, /*
|
|
272
|
487 Return t if SYMBOL's value is not void.
|
|
20
|
488 */
|
|
380
|
489 (symbol))
|
|
0
|
490 {
|
|
380
|
491 CHECK_SYMBOL (symbol);
|
|
|
492 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt;
|
|
0
|
493 }
|
|
|
494
|
|
20
|
495 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /*
|
|
272
|
496 Return t if SYMBOL has a global (non-bound) value.
|
|
0
|
497 This is for the byte-compiler; you really shouldn't be using this.
|
|
20
|
498 */
|
|
380
|
499 (symbol))
|
|
0
|
500 {
|
|
380
|
501 CHECK_SYMBOL (symbol);
|
|
|
502 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt;
|
|
0
|
503 }
|
|
|
504
|
|
20
|
505 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /*
|
|
272
|
506 Return t if SYMBOL's function definition is not void.
|
|
20
|
507 */
|
|
380
|
508 (symbol))
|
|
0
|
509 {
|
|
380
|
510 CHECK_SYMBOL (symbol);
|
|
|
511 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt;
|
|
0
|
512 }
|
|
|
513
|
|
|
514 /* Return non-zero if SYM's value or function (the current contents of
|
|
|
515 which should be passed in as VAL) is constant, i.e. unsettable. */
|
|
|
516
|
|
|
517 static int
|
|
|
518 symbol_is_constant (Lisp_Object sym, Lisp_Object val)
|
|
|
519 {
|
|
|
520 /* #### - I wonder if it would be better to just have a new magic value
|
|
|
521 type and make nil, t, and all keywords have that same magic
|
|
|
522 constant_symbol value. This test is awfully specific about what is
|
|
|
523 constant and what isn't. --Stig */
|
|
272
|
524 if (EQ (sym, Qnil) ||
|
|
|
525 EQ (sym, Qt))
|
|
|
526 return 1;
|
|
|
527
|
|
|
528 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
529 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
530 {
|
|
|
531 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
532 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
533 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
534 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
535 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
536 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
537 return 1;
|
|
284
|
538 default: break; /* Warning suppression */
|
|
272
|
539 }
|
|
|
540
|
|
|
541 /* We don't return true for keywords here because they are handled
|
|
380
|
542 specially by reject_constant_symbols(). */
|
|
272
|
543 return 0;
|
|
0
|
544 }
|
|
|
545
|
|
|
546 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is
|
|
267
|
547 non-zero) to NEWVAL. Make sure this is allowed.
|
|
|
548 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past
|
|
|
549 symbol-value-lisp-magic objects. */
|
|
0
|
550
|
|
380
|
551 void
|
|
0
|
552 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p,
|
|
|
553 Lisp_Object follow_past_lisp_magic)
|
|
|
554 {
|
|
|
555 Lisp_Object val =
|
|
|
556 (function_p ? XSYMBOL (sym)->function
|
|
|
557 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic));
|
|
|
558
|
|
|
559 if (SYMBOL_VALUE_MAGIC_P (val) &&
|
|
80
|
560 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD)
|
|
0
|
561 signal_simple_error ("Use `set-specifier' to change a specifier's value",
|
|
|
562 sym);
|
|
|
563
|
|
267
|
564 if (symbol_is_constant (sym, val)
|
|
398
|
565 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)))
|
|
80
|
566 signal_error (Qsetting_constant,
|
|
|
567 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval));
|
|
0
|
568 }
|
|
|
569
|
|
|
570 /* Verify that it's ok to make SYM buffer-local. This rejects
|
|
|
571 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC
|
|
|
572 specifies whether we delve into symbol-value-lisp-magic objects.
|
|
|
573 (Should be a symbol indicating what action is being taken; that way,
|
|
|
574 we don't delve if there's a handler for that action, but do otherwise.) */
|
|
|
575
|
|
|
576 static void
|
|
|
577 verify_ok_for_buffer_local (Lisp_Object sym,
|
|
|
578 Lisp_Object follow_past_lisp_magic)
|
|
|
579 {
|
|
|
580 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic);
|
|
|
581
|
|
272
|
582 if (symbol_is_constant (sym, val))
|
|
|
583 goto not_ok;
|
|
|
584 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
585 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
586 {
|
|
|
587 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
588 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
589 /* #### It's theoretically possible for it to be reasonable
|
|
|
590 to have both console-local and buffer-local variables,
|
|
|
591 but I don't want to consider that right now. */
|
|
|
592 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
593 goto not_ok;
|
|
284
|
594 default: break; /* Warning suppression */
|
|
272
|
595 }
|
|
|
596
|
|
|
597 return;
|
|
|
598
|
|
|
599 not_ok:
|
|
|
600 signal_error (Qerror,
|
|
|
601 list2 (build_string ("Symbol may not be buffer-local"), sym));
|
|
0
|
602 }
|
|
|
603
|
|
20
|
604 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /*
|
|
0
|
605 Make SYMBOL's value be void.
|
|
20
|
606 */
|
|
380
|
607 (symbol))
|
|
0
|
608 {
|
|
380
|
609 Fset (symbol, Qunbound);
|
|
|
610 return symbol;
|
|
0
|
611 }
|
|
|
612
|
|
20
|
613 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /*
|
|
0
|
614 Make SYMBOL's function definition be void.
|
|
20
|
615 */
|
|
380
|
616 (symbol))
|
|
0
|
617 {
|
|
380
|
618 CHECK_SYMBOL (symbol);
|
|
|
619 reject_constant_symbols (symbol, Qunbound, 1, Qt);
|
|
|
620 XSYMBOL (symbol)->function = Qunbound;
|
|
|
621 return symbol;
|
|
0
|
622 }
|
|
|
623
|
|
20
|
624 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /*
|
|
272
|
625 Return SYMBOL's function definition. Error if that is void.
|
|
20
|
626 */
|
|
|
627 (symbol))
|
|
0
|
628 {
|
|
|
629 CHECK_SYMBOL (symbol);
|
|
|
630 if (UNBOUNDP (XSYMBOL (symbol)->function))
|
|
380
|
631 signal_void_function_error (symbol);
|
|
0
|
632 return XSYMBOL (symbol)->function;
|
|
|
633 }
|
|
|
634
|
|
20
|
635 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /*
|
|
0
|
636 Return SYMBOL's property list.
|
|
20
|
637 */
|
|
380
|
638 (symbol))
|
|
0
|
639 {
|
|
380
|
640 CHECK_SYMBOL (symbol);
|
|
|
641 return XSYMBOL (symbol)->plist;
|
|
0
|
642 }
|
|
|
643
|
|
20
|
644 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /*
|
|
0
|
645 Return SYMBOL's name, a string.
|
|
20
|
646 */
|
|
380
|
647 (symbol))
|
|
0
|
648 {
|
|
|
649 Lisp_Object name;
|
|
|
650
|
|
380
|
651 CHECK_SYMBOL (symbol);
|
|
|
652 XSETSTRING (name, XSYMBOL (symbol)->name);
|
|
0
|
653 return name;
|
|
|
654 }
|
|
|
655
|
|
20
|
656 DEFUN ("fset", Ffset, 2, 2, 0, /*
|
|
167
|
657 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
20
|
658 */
|
|
380
|
659 (symbol, newdef))
|
|
0
|
660 {
|
|
|
661 /* This function can GC */
|
|
380
|
662 CHECK_SYMBOL (symbol);
|
|
|
663 reject_constant_symbols (symbol, newdef, 1, Qt);
|
|
|
664 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
665 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function),
|
|
0
|
666 Vautoload_queue);
|
|
380
|
667 XSYMBOL (symbol)->function = newdef;
|
|
0
|
668 /* Handle automatic advice activation */
|
|
380
|
669 if (CONSP (XSYMBOL (symbol)->plist) &&
|
|
|
670 !NILP (Fget (symbol, Qad_advice_info, Qnil)))
|
|
0
|
671 {
|
|
380
|
672 call2 (Qad_activate, symbol, Qnil);
|
|
|
673 newdef = XSYMBOL (symbol)->function;
|
|
0
|
674 }
|
|
|
675 return newdef;
|
|
|
676 }
|
|
|
677
|
|
|
678 /* FSFmacs */
|
|
20
|
679 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /*
|
|
167
|
680 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
0
|
681 Associates the function with the current load file, if any.
|
|
20
|
682 */
|
|
380
|
683 (symbol, newdef))
|
|
0
|
684 {
|
|
|
685 /* This function can GC */
|
|
380
|
686 Ffset (symbol, newdef);
|
|
|
687 LOADHIST_ATTACH (symbol);
|
|
0
|
688 return newdef;
|
|
|
689 }
|
|
|
690
|
|
|
691
|
|
20
|
692 DEFUN ("setplist", Fsetplist, 2, 2, 0, /*
|
|
167
|
693 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST.
|
|
20
|
694 */
|
|
380
|
695 (symbol, newplist))
|
|
0
|
696 {
|
|
380
|
697 CHECK_SYMBOL (symbol);
|
|
167
|
698 #if 0 /* Inserted for debugging 6/28/1997 -slb */
|
|
|
699 /* Somebody is setting a property list of integer 0, who? */
|
|
|
700 /* Not this way apparently. */
|
|
|
701 if (EQ(newplist, Qzero)) abort();
|
|
|
702 #endif
|
|
|
703
|
|
380
|
704 XSYMBOL (symbol)->plist = newplist;
|
|
0
|
705 return newplist;
|
|
|
706 }
|
|
|
707
|
|
|
708
|
|
|
709 /**********************************************************************/
|
|
|
710 /* symbol-value */
|
|
|
711 /**********************************************************************/
|
|
|
712
|
|
|
713 /* If the contents of the value cell of a symbol is one of the following
|
|
|
714 three types of objects, then the symbol is "magic" in that setting
|
|
|
715 and retrieving its value doesn't just set or retrieve the raw
|
|
|
716 contents of the value cell. None of these objects can escape to
|
|
|
717 the user level, so there is no loss of generality.
|
|
|
718
|
|
|
719 If a symbol is "unbound", then the contents of its value cell is
|
|
284
|
720 Qunbound. Despite appearances, this is *not* a symbol, but is a
|
|
|
721 symbol-value-forward object. This is so that printing it results
|
|
380
|
722 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow.
|
|
0
|
723
|
|
|
724 Logically all of the following objects are "symbol-value-magic"
|
|
|
725 objects, and there are some games played w.r.t. this (#### this
|
|
|
726 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of
|
|
|
727 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of
|
|
|
728 symbol-value-magic object. There are more than three types
|
|
|
729 returned by this macro: in particular, symbol-value-forward
|
|
|
730 has eight subtypes, and symbol-value-buffer-local has two. See
|
|
|
731 symeval.h.
|
|
|
732
|
|
|
733 1. symbol-value-forward
|
|
|
734
|
|
|
735 symbol-value-forward is used for variables whose actual contents
|
|
|
736 are stored in a C variable of some sort, and for Qunbound. The
|
|
|
737 lcheader.next field (which is only used to chain together free
|
|
|
738 lcrecords) holds a pointer to the actual C variable. Included
|
|
|
739 in this type are "buffer-local" variables that are actually
|
|
|
740 stored in the buffer object itself; in this case, the "pointer"
|
|
|
741 is an offset into the struct buffer structure.
|
|
|
742
|
|
|
743 The subtypes are as follows:
|
|
|
744
|
|
|
745 SYMVAL_OBJECT_FORWARD:
|
|
|
746 (declare with DEFVAR_LISP)
|
|
|
747 The value of this variable is stored in a C variable of type
|
|
|
748 "Lisp_Object". Setting this variable sets the C variable.
|
|
|
749 Accessing this variable retrieves a value from the C variable.
|
|
|
750 These variables can be buffer-local -- in this case, the
|
|
|
751 raw symbol-value field gets converted into a
|
|
|
752 symbol-value-buffer-local, whose "current_value" slot contains
|
|
|
753 the symbol-value-forward. (See below.)
|
|
|
754
|
|
|
755 SYMVAL_FIXNUM_FORWARD:
|
|
|
756 SYMVAL_BOOLEAN_FORWARD:
|
|
|
757 (declare with DEFVAR_INT or DEFVAR_BOOL)
|
|
|
758 Similar to SYMVAL_OBJECT_FORWARD except that the C variable
|
|
2
|
759 is of type "int" and is an integer or boolean, respectively.
|
|
0
|
760
|
|
|
761 SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
762 SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
763 SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
764 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or
|
|
|
765 DEFVAR_CONST_BOOL)
|
|
|
766 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or
|
|
|
767 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot
|
|
|
768 be changed.
|
|
|
769
|
|
|
770 SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
771 (declare with DEFVAR_SPECIFIER)
|
|
412
|
772 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that error message
|
|
|
773 you get when attempting to set the value says to use
|
|
0
|
774 `set-specifier' instead.
|
|
|
775
|
|
|
776 SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
777 (declare with DEFVAR_BUFFER_LOCAL)
|
|
|
778 This is used for built-in buffer-local variables -- i.e.
|
|
|
779 Lisp variables whose value is stored in the "struct buffer".
|
|
|
780 Variables of this sort always forward into C "Lisp_Object"
|
|
|
781 fields (although there's no reason in principle that other
|
|
|
782 types for ints and booleans couldn't be added). Note that
|
|
|
783 some of these variables are automatically local in each
|
|
|
784 buffer, while some are only local when they become set
|
|
|
785 (similar to `make-variable-buffer-local'). In these latter
|
|
|
786 cases, of course, the default value shows through in all
|
|
|
787 buffers in which the variable doesn't have a local value.
|
|
|
788 This is implemented by making sure the "struct buffer" field
|
|
|
789 always contains the correct value (whether it's local or
|
|
|
790 a default) and maintaining a mask in the "struct buffer"
|
|
|
791 indicating which fields are local. When `set-default' is
|
|
|
792 called on a variable that's not always local to all buffers,
|
|
|
793 it loops through each buffer and sets the corresponding
|
|
|
794 field in each buffer without a local value for the field,
|
|
|
795 according to the mask.
|
|
|
796
|
|
|
797 Calling `make-local-variable' on a variable of this sort
|
|
|
798 only has the effect of maybe changing the current buffer's mask.
|
|
|
799 Calling `make-variable-buffer-local' on a variable of this
|
|
|
800 sort has no effect at all.
|
|
|
801
|
|
|
802 SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
803 (declare with DEFVAR_CONST_BUFFER_LOCAL)
|
|
|
804 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the
|
|
|
805 value cannot be set.
|
|
|
806
|
|
|
807 SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
808 (declare with DEFVAR_BUFFER_DEFAULTS)
|
|
|
809 This is used for the Lisp variables that contain the
|
|
|
810 default values of built-in buffer-local variables. Setting
|
|
|
811 or referencing one of these variables forwards into a slot
|
|
|
812 in the special struct buffer Vbuffer_defaults.
|
|
|
813
|
|
|
814 SYMVAL_UNBOUND_MARKER:
|
|
|
815 This is used for only one object, Qunbound.
|
|
|
816
|
|
|
817 SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
818 (declare with DEFVAR_CONSOLE_LOCAL)
|
|
|
819 This is used for built-in console-local variables -- i.e.
|
|
|
820 Lisp variables whose value is stored in the "struct console".
|
|
|
821 These work just like built-in buffer-local variables.
|
|
|
822 However, calling `make-local-variable' or
|
|
|
823 `make-variable-buffer-local' on one of these variables
|
|
|
824 is currently disallowed because that would entail having
|
|
|
825 both console-local and buffer-local variables, which is
|
|
|
826 trickier to implement.
|
|
173
|
827
|
|
0
|
828 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
829 (declare with DEFVAR_CONST_CONSOLE_LOCAL)
|
|
|
830 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the
|
|
|
831 value cannot be set.
|
|
|
832
|
|
|
833 SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
834 (declare with DEFVAR_CONSOLE_DEFAULTS)
|
|
|
835 This is used for the Lisp variables that contain the
|
|
|
836 default values of built-in console-local variables. Setting
|
|
|
837 or referencing one of these variables forwards into a slot
|
|
|
838 in the special struct console Vconsole_defaults.
|
|
|
839
|
|
|
840
|
|
|
841 2. symbol-value-buffer-local
|
|
|
842
|
|
|
843 symbol-value-buffer-local is used for variables that have had
|
|
|
844 `make-local-variable' or `make-variable-buffer-local' applied
|
|
|
845 to them. This object contains an alist mapping buffers to
|
|
|
846 values. In addition, the object contains a "current value",
|
|
|
847 which is the value in some buffer. Whenever you access the
|
|
|
848 variable with `symbol-value' or set it with `set' or `setq',
|
|
|
849 things are switched around so that the "current value"
|
|
|
850 refers to the current buffer, if it wasn't already. This
|
|
|
851 way, repeated references to a variable in the same buffer
|
|
|
852 are almost as efficient as if the variable weren't buffer
|
|
|
853 local. Note that the alist may not be up-to-date w.r.t.
|
|
|
854 the buffer whose value is current, as the "current value"
|
|
|
855 cache is normally only flushed into the alist when the
|
|
|
856 buffer it refers to changes.
|
|
|
857
|
|
|
858 Note also that it is possible for `make-local-variable'
|
|
|
859 or `make-variable-buffer-local' to be called on a variable
|
|
|
860 that forwards into a C variable (i.e. a variable whose
|
|
|
861 value cell is a symbol-value-forward). In this case,
|
|
|
862 the value cell becomes a symbol-value-buffer-local (as
|
|
|
863 always), and the symbol-value-forward moves into
|
|
|
864 the "current value" cell in this object. Also, in
|
|
|
865 this case the "current value" *always* refers to the
|
|
|
866 current buffer, so that the values of the C variable
|
|
|
867 always is the correct value for the current buffer.
|
|
|
868 set_buffer_internal() automatically updates the current-value
|
|
|
869 cells of all buffer-local variables that forward into C
|
|
|
870 variables. (There is a list of all buffer-local variables
|
|
|
871 that is maintained for this and other purposes.)
|
|
|
872
|
|
|
873 Note that only certain types of `symbol-value-forward' objects
|
|
|
874 can find their way into the "current value" cell of a
|
|
|
875 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD,
|
|
|
876 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and
|
|
|
877 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot
|
|
|
878 be buffer-local because they are unsettable;
|
|
|
879 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that
|
|
|
880 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local
|
|
|
881 does not have much of an effect (it's already buffer-local); and
|
|
|
882 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because
|
|
|
883 that's not currently implemented.
|
|
|
884
|
|
|
885
|
|
|
886 3. symbol-value-varalias
|
|
|
887
|
|
|
888 A symbol-value-varalias object is used for variables that
|
|
|
889 are aliases for other variables. This object contains
|
|
|
890 the symbol that this variable is aliased to.
|
|
|
891 symbol-value-varalias objects cannot occur anywhere within
|
|
|
892 a symbol-value-buffer-local object, and most of the
|
|
|
893 low-level functions below do not accept them; you need
|
|
|
894 to call follow_varalias_pointers to get the actual
|
|
284
|
895 symbol to operate on. */
|
|
0
|
896
|
|
|
897 static Lisp_Object
|
|
412
|
898 mark_symbol_value_buffer_local (Lisp_Object obj,
|
|
|
899 void (*markobj) (Lisp_Object))
|
|
0
|
900 {
|
|
|
901 struct symbol_value_buffer_local *bfwd;
|
|
|
902
|
|
380
|
903 #ifdef ERROR_CHECK_TYPECHECK
|
|
0
|
904 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL ||
|
|
|
905 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL);
|
|
380
|
906 #endif
|
|
0
|
907
|
|
|
908 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj);
|
|
412
|
909 markobj (bfwd->default_value);
|
|
|
910 markobj (bfwd->current_value);
|
|
|
911 markobj (bfwd->current_buffer);
|
|
173
|
912 return bfwd->current_alist_element;
|
|
0
|
913 }
|
|
|
914
|
|
|
915 static Lisp_Object
|
|
412
|
916 mark_symbol_value_lisp_magic (Lisp_Object obj,
|
|
|
917 void (*markobj) (Lisp_Object))
|
|
0
|
918 {
|
|
|
919 struct symbol_value_lisp_magic *bfwd;
|
|
|
920 int i;
|
|
|
921
|
|
|
922 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC);
|
|
|
923
|
|
|
924 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj);
|
|
|
925 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
926 {
|
|
412
|
927 markobj (bfwd->handler[i]);
|
|
|
928 markobj (bfwd->harg[i]);
|
|
0
|
929 }
|
|
173
|
930 return bfwd->shadowed;
|
|
0
|
931 }
|
|
|
932
|
|
|
933 static Lisp_Object
|
|
412
|
934 mark_symbol_value_varalias (Lisp_Object obj,
|
|
|
935 void (*markobj) (Lisp_Object))
|
|
0
|
936 {
|
|
|
937 struct symbol_value_varalias *bfwd;
|
|
|
938
|
|
|
939 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS);
|
|
|
940
|
|
|
941 bfwd = XSYMBOL_VALUE_VARALIAS (obj);
|
|
412
|
942 markobj (bfwd->shadowed);
|
|
173
|
943 return bfwd->aliasee;
|
|
0
|
944 }
|
|
|
945
|
|
|
946 /* Should never, ever be called. (except by an external debugger) */
|
|
|
947 void
|
|
173
|
948 print_symbol_value_magic (Lisp_Object obj,
|
|
0
|
949 Lisp_Object printcharfun, int escapeflag)
|
|
|
950 {
|
|
|
951 char buf[200];
|
|
380
|
952 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%lx>",
|
|
272
|
953 XRECORD_LHEADER_IMPLEMENTATION (obj)->name,
|
|
|
954 XSYMBOL_VALUE_MAGIC_TYPE (obj),
|
|
380
|
955 (long) XPNTR (obj));
|
|
0
|
956 write_c_string (buf, printcharfun);
|
|
|
957 }
|
|
|
958
|
|
420
|
959 static const struct lrecord_description symbol_value_buffer_local_description[] = {
|
|
|
960 { XD_LISP_OBJECT, offsetof(struct symbol_value_buffer_local, default_value), 4 },
|
|
|
961 { XD_END }
|
|
|
962 };
|
|
|
963
|
|
|
964 static const struct lrecord_description symbol_value_lisp_magic_description[] = {
|
|
|
965 { XD_LISP_OBJECT, offsetof(struct symbol_value_lisp_magic, handler), 2*MAGIC_HANDLER_MAX+1 },
|
|
|
966 { XD_END }
|
|
|
967 };
|
|
|
968
|
|
|
969 static const struct lrecord_description symbol_value_varalias_description[] = {
|
|
|
970 { XD_LISP_OBJECT, offsetof(struct symbol_value_varalias, aliasee), 2 },
|
|
|
971 { XD_END }
|
|
|
972 };
|
|
|
973
|
|
272
|
974 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-forward",
|
|
|
975 symbol_value_forward,
|
|
412
|
976 this_one_is_unmarkable,
|
|
420
|
977 print_symbol_value_magic, 0, 0, 0, 0,
|
|
272
|
978 struct symbol_value_forward);
|
|
|
979
|
|
|
980 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-buffer-local",
|
|
|
981 symbol_value_buffer_local,
|
|
|
982 mark_symbol_value_buffer_local,
|
|
|
983 print_symbol_value_magic, 0, 0, 0,
|
|
420
|
984 symbol_value_buffer_local_description,
|
|
272
|
985 struct symbol_value_buffer_local);
|
|
|
986
|
|
|
987 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-lisp-magic",
|
|
|
988 symbol_value_lisp_magic,
|
|
|
989 mark_symbol_value_lisp_magic,
|
|
|
990 print_symbol_value_magic, 0, 0, 0,
|
|
420
|
991 symbol_value_lisp_magic_description,
|
|
272
|
992 struct symbol_value_lisp_magic);
|
|
|
993
|
|
|
994 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-varalias",
|
|
|
995 symbol_value_varalias,
|
|
|
996 mark_symbol_value_varalias,
|
|
|
997 print_symbol_value_magic, 0, 0, 0,
|
|
420
|
998 symbol_value_varalias_description,
|
|
272
|
999 struct symbol_value_varalias);
|
|
|
1000
|
|
0
|
1001
|
|
|
1002 /* Getting and setting values of symbols */
|
|
|
1003
|
|
|
1004 /* Given the raw contents of a symbol value cell, return the Lisp value of
|
|
|
1005 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local,
|
|
|
1006 symbol-value-lisp-magic, or symbol-value-varalias.
|
|
|
1007
|
|
|
1008 BUFFER specifies a buffer, and is used for built-in buffer-local
|
|
|
1009 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD.
|
|
|
1010 Note that such variables are never encapsulated in a
|
|
|
1011 symbol-value-buffer-local structure.
|
|
|
1012
|
|
|
1013 CONSOLE specifies a console, and is used for built-in console-local
|
|
|
1014 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD.
|
|
|
1015 Note that such variables are (currently) never encapsulated in a
|
|
|
1016 symbol-value-buffer-local structure.
|
|
|
1017 */
|
|
|
1018
|
|
|
1019 static Lisp_Object
|
|
|
1020 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer,
|
|
|
1021 struct console *console)
|
|
|
1022 {
|
|
412
|
1023 CONST struct symbol_value_forward *fwd;
|
|
0
|
1024
|
|
|
1025 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1026 return valcontents;
|
|
0
|
1027
|
|
|
1028 fwd = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1029 switch (fwd->magic.type)
|
|
|
1030 {
|
|
|
1031 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1032 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
173
|
1033 return make_int (*((int *)symbol_value_forward_forward (fwd)));
|
|
0
|
1034
|
|
|
1035 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1036 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
173
|
1037 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil;
|
|
0
|
1038
|
|
|
1039 case SYMVAL_OBJECT_FORWARD:
|
|
|
1040 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
1041 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
173
|
1042 return *((Lisp_Object *)symbol_value_forward_forward (fwd));
|
|
0
|
1043
|
|
|
1044 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1045 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1046 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1047 - (char *)&buffer_local_flags))));
|
|
|
1048
|
|
|
1049
|
|
|
1050 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1051 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
1052 assert (buffer);
|
|
|
1053 return (*((Lisp_Object *)((char *)buffer
|
|
|
1054 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1055 - (char *)&buffer_local_flags))));
|
|
|
1056
|
|
|
1057 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1058 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1059 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1060 - (char *)&console_local_flags))));
|
|
|
1061
|
|
|
1062 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1063 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
1064 assert (console);
|
|
|
1065 return (*((Lisp_Object *)((char *)console
|
|
|
1066 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1067 - (char *)&console_local_flags))));
|
|
|
1068
|
|
|
1069 case SYMVAL_UNBOUND_MARKER:
|
|
173
|
1070 return valcontents;
|
|
0
|
1071
|
|
|
1072 default:
|
|
|
1073 abort ();
|
|
|
1074 }
|
|
|
1075 return Qnil; /* suppress compiler warning */
|
|
|
1076 }
|
|
|
1077
|
|
|
1078 /* Set the value of default-buffer-local variable SYM to VALUE. */
|
|
|
1079
|
|
|
1080 static void
|
|
|
1081 set_default_buffer_slot_variable (Lisp_Object sym,
|
|
|
1082 Lisp_Object value)
|
|
|
1083 {
|
|
|
1084 /* Handle variables like case-fold-search that have special slots in
|
|
|
1085 the buffer. Make them work apparently like buffer_local variables.
|
|
|
1086 */
|
|
|
1087 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1088 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1089 have already called it. */
|
|
|
1090 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
412
|
1091 CONST struct symbol_value_forward *fwd
|
|
0
|
1092 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
1093 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
1094 - (char *) &buffer_local_flags);
|
|
|
1095 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1096 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1097 int flags) = symbol_value_forward_magicfun (fwd);
|
|
173
|
1098
|
|
0
|
1099 *((Lisp_Object *) (offset + (char *) XBUFFER (Vbuffer_defaults)))
|
|
|
1100 = value;
|
|
173
|
1101
|
|
0
|
1102 if (mask > 0) /* Not always per-buffer */
|
|
|
1103 {
|
|
380
|
1104 Lisp_Object elt;
|
|
173
|
1105
|
|
0
|
1106 /* Set value in each buffer which hasn't shadowed the default */
|
|
380
|
1107 LIST_LOOP_2 (elt, Vbuffer_alist)
|
|
0
|
1108 {
|
|
380
|
1109 struct buffer *b = XBUFFER (XCDR (elt));
|
|
0
|
1110 if (!(b->local_var_flags & mask))
|
|
|
1111 {
|
|
|
1112 if (magicfun)
|
|
380
|
1113 magicfun (sym, &value, make_buffer (b), 0);
|
|
173
|
1114 *((Lisp_Object *) (offset + (char *) b)) = value;
|
|
0
|
1115 }
|
|
|
1116 }
|
|
|
1117 }
|
|
|
1118 }
|
|
|
1119
|
|
|
1120 /* Set the value of default-console-local variable SYM to VALUE. */
|
|
|
1121
|
|
|
1122 static void
|
|
|
1123 set_default_console_slot_variable (Lisp_Object sym,
|
|
|
1124 Lisp_Object value)
|
|
|
1125 {
|
|
|
1126 /* Handle variables like case-fold-search that have special slots in
|
|
|
1127 the console. Make them work apparently like console_local variables.
|
|
|
1128 */
|
|
|
1129 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1130 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1131 have already called it. */
|
|
|
1132 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
412
|
1133 CONST struct symbol_value_forward *fwd
|
|
0
|
1134 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
1135 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
1136 - (char *) &console_local_flags);
|
|
|
1137 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1138 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1139 int flags) = symbol_value_forward_magicfun (fwd);
|
|
173
|
1140
|
|
0
|
1141 *((Lisp_Object *) (offset + (char *) XCONSOLE (Vconsole_defaults)))
|
|
|
1142 = value;
|
|
173
|
1143
|
|
0
|
1144 if (mask > 0) /* Not always per-console */
|
|
|
1145 {
|
|
380
|
1146 Lisp_Object console;
|
|
173
|
1147
|
|
0
|
1148 /* Set value in each console which hasn't shadowed the default */
|
|
380
|
1149 LIST_LOOP_2 (console, Vconsole_list)
|
|
0
|
1150 {
|
|
380
|
1151 struct console *d = XCONSOLE (console);
|
|
0
|
1152 if (!(d->local_var_flags & mask))
|
|
|
1153 {
|
|
|
1154 if (magicfun)
|
|
380
|
1155 magicfun (sym, &value, console, 0);
|
|
173
|
1156 *((Lisp_Object *) (offset + (char *) d)) = value;
|
|
0
|
1157 }
|
|
|
1158 }
|
|
|
1159 }
|
|
|
1160 }
|
|
|
1161
|
|
|
1162 /* Store NEWVAL into SYM.
|
|
|
1163
|
|
|
1164 SYM's value slot may *not* be types (5) or (6) above,
|
|
|
1165 i.e. no symbol-value-varalias objects. (You should have
|
|
|
1166 forwarded past all of these.)
|
|
|
1167
|
|
|
1168 SYM should not be an unsettable symbol or a symbol with
|
|
|
1169 a magic `set-value' handler (unless you want to explicitly
|
|
|
1170 ignore this handler).
|
|
|
1171
|
|
|
1172 OVALUE is the current value of SYM, but forwarded past any
|
|
|
1173 symbol-value-buffer-local and symbol-value-lisp-magic objects.
|
|
|
1174 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be
|
|
|
1175 the contents of its current-value cell.) NEWVAL may only be
|
|
|
1176 a simple value or Qunbound. If SYM is a symbol-value-buffer-local,
|
|
|
1177 this function will only modify its current-value cell, which should
|
|
|
1178 already be set up to point to the current buffer.
|
|
|
1179 */
|
|
|
1180
|
|
|
1181 static void
|
|
|
1182 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue,
|
|
|
1183 Lisp_Object newval)
|
|
|
1184 {
|
|
|
1185 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue))
|
|
|
1186 {
|
|
|
1187 Lisp_Object *store_pointer = value_slot_past_magic (sym);
|
|
|
1188
|
|
|
1189 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer))
|
|
|
1190 store_pointer =
|
|
|
1191 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value;
|
|
|
1192
|
|
|
1193 assert (UNBOUNDP (*store_pointer)
|
|
|
1194 || !SYMBOL_VALUE_MAGIC_P (*store_pointer));
|
|
|
1195 *store_pointer = newval;
|
|
|
1196 }
|
|
|
1197 else
|
|
|
1198 {
|
|
412
|
1199 CONST struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue);
|
|
0
|
1200 int (*magicfun) (Lisp_Object simm, Lisp_Object *val,
|
|
380
|
1201 Lisp_Object in_object, int flags)
|
|
|
1202 = symbol_value_forward_magicfun (fwd);
|
|
|
1203
|
|
|
1204 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue))
|
|
0
|
1205 {
|
|
|
1206 case SYMVAL_FIXNUM_FORWARD:
|
|
380
|
1207 CHECK_INT (newval);
|
|
|
1208 if (magicfun)
|
|
|
1209 magicfun (sym, &newval, Qnil, 0);
|
|
|
1210 *((int *) symbol_value_forward_forward (fwd)) = XINT (newval);
|
|
|
1211 return;
|
|
0
|
1212
|
|
|
1213 case SYMVAL_BOOLEAN_FORWARD:
|
|
380
|
1214 if (magicfun)
|
|
|
1215 magicfun (sym, &newval, Qnil, 0);
|
|
|
1216 *((int *) symbol_value_forward_forward (fwd))
|
|
412
|
1217 = ((NILP (newval)) ? 0 : 1);
|
|
380
|
1218 return;
|
|
0
|
1219
|
|
|
1220 case SYMVAL_OBJECT_FORWARD:
|
|
380
|
1221 if (magicfun)
|
|
|
1222 magicfun (sym, &newval, Qnil, 0);
|
|
|
1223 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval;
|
|
|
1224 return;
|
|
173
|
1225
|
|
0
|
1226 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
380
|
1227 set_default_buffer_slot_variable (sym, newval);
|
|
|
1228 return;
|
|
0
|
1229
|
|
|
1230 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
380
|
1231 if (magicfun)
|
|
|
1232 magicfun (sym, &newval, make_buffer (current_buffer), 0);
|
|
|
1233 *((Lisp_Object *) ((char *) current_buffer
|
|
|
1234 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1235 - (char *) &buffer_local_flags)))
|
|
|
1236 = newval;
|
|
|
1237 return;
|
|
0
|
1238
|
|
|
1239 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
380
|
1240 set_default_console_slot_variable (sym, newval);
|
|
|
1241 return;
|
|
0
|
1242
|
|
|
1243 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
380
|
1244 if (magicfun)
|
|
|
1245 magicfun (sym, &newval, Vselected_console, 0);
|
|
|
1246 *((Lisp_Object *) ((char *) XCONSOLE (Vselected_console)
|
|
|
1247 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1248 - (char *) &console_local_flags)))
|
|
|
1249 = newval;
|
|
|
1250 return;
|
|
0
|
1251
|
|
|
1252 default:
|
|
|
1253 abort ();
|
|
|
1254 }
|
|
|
1255 }
|
|
|
1256 }
|
|
|
1257
|
|
|
1258 /* Given a per-buffer variable SYMBOL and its raw value-cell contents
|
|
|
1259 BFWD, locate and return a pointer to the element in BUFFER's
|
|
|
1260 local_var_alist for SYMBOL. The return value will be Qnil if
|
|
|
1261 BUFFER does not have its own value for SYMBOL (i.e. the default
|
|
|
1262 value is seen in that buffer).
|
|
|
1263 */
|
|
|
1264
|
|
|
1265 static Lisp_Object
|
|
|
1266 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol,
|
|
|
1267 struct symbol_value_buffer_local *bfwd)
|
|
|
1268 {
|
|
|
1269 if (!NILP (bfwd->current_buffer) &&
|
|
|
1270 XBUFFER (bfwd->current_buffer) == buffer)
|
|
|
1271 /* This is just an optimization of the below. */
|
|
173
|
1272 return bfwd->current_alist_element;
|
|
0
|
1273 else
|
|
173
|
1274 return assq_no_quit (symbol, buffer->local_var_alist);
|
|
0
|
1275 }
|
|
|
1276
|
|
|
1277 /* [Remember that the slot that mirrors CURRENT-VALUE in the
|
|
|
1278 symbol-value-buffer-local of a per-buffer variable -- i.e. the
|
|
|
1279 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE
|
|
|
1280 slot -- may be out of date.]
|
|
|
1281
|
|
|
1282 Write out any cached value in buffer-local variable SYMBOL's
|
|
|
1283 buffer-local structure, which is passed in as BFWD.
|
|
|
1284 */
|
|
|
1285
|
|
|
1286 static void
|
|
|
1287 write_out_buffer_local_cache (Lisp_Object symbol,
|
|
|
1288 struct symbol_value_buffer_local *bfwd)
|
|
|
1289 {
|
|
|
1290 if (!NILP (bfwd->current_buffer))
|
|
|
1291 {
|
|
|
1292 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD
|
|
|
1293 uses it, and that type cannot be inside a symbol-value-buffer-local */
|
|
|
1294 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0);
|
|
|
1295 if (NILP (bfwd->current_alist_element))
|
|
|
1296 /* current_value may be updated more recently than default_value */
|
|
|
1297 bfwd->default_value = cval;
|
|
|
1298 else
|
|
|
1299 Fsetcdr (bfwd->current_alist_element, cval);
|
|
|
1300 }
|
|
|
1301 }
|
|
|
1302
|
|
|
1303 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure.
|
|
|
1304 Set up BFWD's cache for validity in buffer BUF. This assumes that
|
|
|
1305 the cache is currently in a consistent state (this can include
|
|
|
1306 not having any value cached, if BFWD->CURRENT_BUFFER is nil).
|
|
|
1307
|
|
|
1308 If the cache is already set up for BUF, this function does nothing
|
|
|
1309 at all.
|
|
|
1310
|
|
|
1311 Otherwise, if SYM forwards out to a C variable, this also forwards
|
|
|
1312 SYM's value in BUF out to the variable. Therefore, you generally
|
|
|
1313 only want to call this when BUF is, or is about to become, the
|
|
|
1314 current buffer.
|
|
|
1315
|
|
|
1316 (Otherwise, you can just retrieve the value without changing the
|
|
|
1317 cache, at the expense of slower retrieval.)
|
|
|
1318 */
|
|
|
1319
|
|
|
1320 static void
|
|
173
|
1321 set_up_buffer_local_cache (Lisp_Object sym,
|
|
0
|
1322 struct symbol_value_buffer_local *bfwd,
|
|
82
|
1323 struct buffer *buf,
|
|
|
1324 Lisp_Object new_alist_el,
|
|
|
1325 int set_it_p)
|
|
0
|
1326 {
|
|
82
|
1327 Lisp_Object new_val;
|
|
0
|
1328
|
|
|
1329 if (!NILP (bfwd->current_buffer)
|
|
|
1330 && buf == XBUFFER (bfwd->current_buffer))
|
|
|
1331 /* Cache is already set up. */
|
|
|
1332 return;
|
|
|
1333
|
|
|
1334 /* Flush out the old cache. */
|
|
|
1335 write_out_buffer_local_cache (sym, bfwd);
|
|
|
1336
|
|
|
1337 /* Retrieve the new alist element and new value. */
|
|
82
|
1338 if (NILP (new_alist_el)
|
|
|
1339 && set_it_p)
|
|
380
|
1340 new_alist_el = buffer_local_alist_element (buf, sym, bfwd);
|
|
82
|
1341
|
|
0
|
1342 if (NILP (new_alist_el))
|
|
|
1343 new_val = bfwd->default_value;
|
|
|
1344 else
|
|
|
1345 new_val = Fcdr (new_alist_el);
|
|
|
1346
|
|
|
1347 bfwd->current_alist_element = new_alist_el;
|
|
|
1348 XSETBUFFER (bfwd->current_buffer, buf);
|
|
|
1349
|
|
|
1350 /* Now store the value into the current-value slot.
|
|
|
1351 We don't simply write it there, because the current-value
|
|
|
1352 slot might be a forwarding pointer, in which case we need
|
|
|
1353 to instead write the value into the C variable.
|
|
|
1354
|
|
|
1355 We might also want to call a magic function.
|
|
|
1356
|
|
|
1357 So instead, we call this function. */
|
|
|
1358 store_symval_forwarding (sym, bfwd->current_value, new_val);
|
|
|
1359 }
|
|
|
1360
|
|
|
1361
|
|
|
1362 void
|
|
|
1363 kill_buffer_local_variables (struct buffer *buf)
|
|
|
1364 {
|
|
|
1365 Lisp_Object prev = Qnil;
|
|
|
1366 Lisp_Object alist;
|
|
|
1367
|
|
|
1368 /* Any which are supposed to be permanent,
|
|
|
1369 make local again, with the same values they had. */
|
|
173
|
1370
|
|
0
|
1371 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist))
|
|
|
1372 {
|
|
|
1373 Lisp_Object sym = XCAR (XCAR (alist));
|
|
|
1374 struct symbol_value_buffer_local *bfwd;
|
|
|
1375 /* Variables with a symbol-value-varalias should not be here
|
|
|
1376 (we should have forwarded past them) and there must be a
|
|
|
1377 symbol-value-buffer-local. If there's a symbol-value-lisp-magic,
|
|
|
1378 just forward past it; if the variable has a handler, it was
|
|
|
1379 already called. */
|
|
|
1380 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt);
|
|
|
1381
|
|
|
1382 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value));
|
|
|
1383 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value);
|
|
|
1384
|
|
|
1385 if (!NILP (Fget (sym, Qpermanent_local, Qnil)))
|
|
|
1386 /* prev points to the last alist element that is still
|
|
|
1387 staying around, so *only* update it now. This didn't
|
|
|
1388 used to be the case; this bug has been around since
|
|
|
1389 mly's rewrite two years ago! */
|
|
|
1390 prev = alist;
|
|
|
1391 else
|
|
|
1392 {
|
|
|
1393 /* Really truly kill it. */
|
|
|
1394 if (!NILP (prev))
|
|
|
1395 XCDR (prev) = XCDR (alist);
|
|
|
1396 else
|
|
|
1397 buf->local_var_alist = XCDR (alist);
|
|
|
1398
|
|
|
1399 /* We just effectively changed the value for this variable
|
|
|
1400 in BUF. So: */
|
|
|
1401
|
|
|
1402 /* (1) If the cache is caching BUF, invalidate the cache. */
|
|
|
1403 if (!NILP (bfwd->current_buffer) &&
|
|
|
1404 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1405 bfwd->current_buffer = Qnil;
|
|
|
1406
|
|
|
1407 /* (2) If we changed the value in current_buffer and this
|
|
|
1408 variable forwards to a C variable, we need to change the
|
|
|
1409 value of the C variable. set_up_buffer_local_cache()
|
|
|
1410 will do this. It doesn't hurt to do it whenever
|
|
|
1411 BUF == current_buffer, so just go ahead and do that. */
|
|
|
1412 if (buf == current_buffer)
|
|
82
|
1413 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0);
|
|
0
|
1414 }
|
|
|
1415 }
|
|
|
1416 }
|
|
|
1417
|
|
|
1418 static Lisp_Object
|
|
|
1419 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf,
|
|
82
|
1420 struct console *con, int swap_it_in,
|
|
|
1421 Lisp_Object symcons, int set_it_p)
|
|
0
|
1422 {
|
|
|
1423 Lisp_Object valcontents;
|
|
|
1424
|
|
|
1425 retry:
|
|
|
1426 valcontents = XSYMBOL (sym)->value;
|
|
|
1427
|
|
|
1428 retry_2:
|
|
|
1429 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1430 return valcontents;
|
|
0
|
1431
|
|
|
1432 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1433 {
|
|
|
1434 case SYMVAL_LISP_MAGIC:
|
|
|
1435 /* #### kludge */
|
|
|
1436 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1437 /* semi-change-o */
|
|
|
1438 goto retry_2;
|
|
|
1439
|
|
|
1440 case SYMVAL_VARALIAS:
|
|
|
1441 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
82
|
1442 symcons = Qnil;
|
|
0
|
1443 /* presto change-o! */
|
|
|
1444 goto retry;
|
|
|
1445
|
|
|
1446 case SYMVAL_BUFFER_LOCAL:
|
|
|
1447 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1448 {
|
|
|
1449 struct symbol_value_buffer_local *bfwd
|
|
|
1450 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1451
|
|
|
1452 if (swap_it_in)
|
|
|
1453 {
|
|
82
|
1454 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p);
|
|
0
|
1455 valcontents = bfwd->current_value;
|
|
|
1456 }
|
|
|
1457 else
|
|
|
1458 {
|
|
|
1459 if (!NILP (bfwd->current_buffer) &&
|
|
|
1460 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1461 valcontents = bfwd->current_value;
|
|
82
|
1462 else if (NILP (symcons))
|
|
0
|
1463 {
|
|
82
|
1464 if (set_it_p)
|
|
380
|
1465 valcontents = assq_no_quit (sym, buf->local_var_alist);
|
|
0
|
1466 if (NILP (valcontents))
|
|
|
1467 valcontents = bfwd->default_value;
|
|
|
1468 else
|
|
82
|
1469 valcontents = XCDR (valcontents);
|
|
0
|
1470 }
|
|
82
|
1471 else
|
|
|
1472 valcontents = XCDR (symcons);
|
|
0
|
1473 }
|
|
|
1474 break;
|
|
|
1475 }
|
|
173
|
1476
|
|
0
|
1477 default:
|
|
|
1478 break;
|
|
|
1479 }
|
|
173
|
1480 return do_symval_forwarding (valcontents, buf, con);
|
|
0
|
1481 }
|
|
|
1482
|
|
|
1483
|
|
|
1484 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not
|
|
|
1485 bound. Note that it must not be possible to QUIT within this
|
|
|
1486 function. */
|
|
|
1487
|
|
|
1488 Lisp_Object
|
|
|
1489 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer)
|
|
|
1490 {
|
|
|
1491 struct buffer *buf;
|
|
|
1492
|
|
|
1493 CHECK_SYMBOL (sym);
|
|
|
1494
|
|
380
|
1495 if (NILP (buffer))
|
|
|
1496 buf = current_buffer;
|
|
|
1497 else
|
|
0
|
1498 {
|
|
|
1499 CHECK_BUFFER (buffer);
|
|
|
1500 buf = XBUFFER (buffer);
|
|
|
1501 }
|
|
|
1502
|
|
|
1503 return find_symbol_value_1 (sym, buf,
|
|
|
1504 /* If it bombs out at startup due to a
|
|
|
1505 Lisp error, this may be nil. */
|
|
|
1506 CONSOLEP (Vselected_console)
|
|
82
|
1507 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1);
|
|
0
|
1508 }
|
|
|
1509
|
|
|
1510 static Lisp_Object
|
|
|
1511 symbol_value_in_console (Lisp_Object sym, Lisp_Object console)
|
|
|
1512 {
|
|
|
1513 CHECK_SYMBOL (sym);
|
|
|
1514
|
|
380
|
1515 if (NILP (console))
|
|
|
1516 console = Vselected_console;
|
|
|
1517 else
|
|
0
|
1518 CHECK_CONSOLE (console);
|
|
|
1519
|
|
82
|
1520 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0,
|
|
|
1521 Qnil, 1);
|
|
0
|
1522 }
|
|
|
1523
|
|
|
1524 /* Return the current value of SYM. The difference between this function
|
|
|
1525 and calling symbol_value_in_buffer with a BUFFER of Qnil is that
|
|
|
1526 this updates the CURRENT_VALUE slot of buffer-local variables to
|
|
|
1527 point to the current buffer, while symbol_value_in_buffer doesn't. */
|
|
|
1528
|
|
|
1529 Lisp_Object
|
|
|
1530 find_symbol_value (Lisp_Object sym)
|
|
|
1531 {
|
|
|
1532 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1533 and Vselected_console is Qnil, early in initialization. */
|
|
380
|
1534 struct console *con;
|
|
195
|
1535 Lisp_Object valcontents;
|
|
0
|
1536
|
|
|
1537 CHECK_SYMBOL (sym);
|
|
195
|
1538
|
|
|
1539 valcontents = XSYMBOL (sym)->value;
|
|
|
1540 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1541 return valcontents;
|
|
|
1542
|
|
0
|
1543 if (CONSOLEP (Vselected_console))
|
|
380
|
1544 con = XCONSOLE (Vselected_console);
|
|
0
|
1545 else
|
|
|
1546 {
|
|
|
1547 /* This can also get called while we're preparing to shutdown.
|
|
|
1548 #### What should really happen in that case? Should we
|
|
|
1549 actually fix things so we can't get here in that case? */
|
|
|
1550 assert (!initialized || preparing_for_armageddon);
|
|
380
|
1551 con = 0;
|
|
0
|
1552 }
|
|
|
1553
|
|
380
|
1554 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1);
|
|
82
|
1555 }
|
|
|
1556
|
|
|
1557 /* This is an optimized function for quick lookup of buffer local symbols
|
|
|
1558 by avoiding O(n) search. This will work when either:
|
|
|
1559 a) We have already found the symbol e.g. by traversing local_var_alist.
|
|
|
1560 or
|
|
|
1561 b) We know that the symbol will not be found in the current buffer's
|
|
|
1562 list of local variables.
|
|
|
1563 In the former case, find_it_p is 1 and symbol_cons is the element from
|
|
|
1564 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons
|
|
|
1565 is the symbol.
|
|
|
1566
|
|
|
1567 This function is called from set_buffer_internal which does both of these
|
|
|
1568 things. */
|
|
|
1569
|
|
|
1570 Lisp_Object
|
|
|
1571 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p)
|
|
|
1572 {
|
|
|
1573 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1574 and Vselected_console is Qnil, early in initialization. */
|
|
380
|
1575 struct console *con;
|
|
82
|
1576 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons;
|
|
173
|
1577
|
|
82
|
1578 CHECK_SYMBOL (sym);
|
|
|
1579 if (CONSOLEP (Vselected_console))
|
|
380
|
1580 con = XCONSOLE (Vselected_console);
|
|
82
|
1581 else
|
|
|
1582 {
|
|
|
1583 /* This can also get called while we're preparing to shutdown.
|
|
|
1584 #### What should really happen in that case? Should we
|
|
|
1585 actually fix things so we can't get here in that case? */
|
|
|
1586 assert (!initialized || preparing_for_armageddon);
|
|
380
|
1587 con = 0;
|
|
82
|
1588 }
|
|
|
1589
|
|
380
|
1590 return find_symbol_value_1 (sym, current_buffer, con, 1,
|
|
82
|
1591 find_it_p ? symbol_cons : Qnil,
|
|
|
1592 find_it_p);
|
|
0
|
1593 }
|
|
|
1594
|
|
20
|
1595 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /*
|
|
0
|
1596 Return SYMBOL's value. Error if that is void.
|
|
20
|
1597 */
|
|
380
|
1598 (symbol))
|
|
0
|
1599 {
|
|
380
|
1600 Lisp_Object val = find_symbol_value (symbol);
|
|
0
|
1601
|
|
|
1602 if (UNBOUNDP (val))
|
|
380
|
1603 return Fsignal (Qvoid_variable, list1 (symbol));
|
|
0
|
1604 else
|
|
|
1605 return val;
|
|
|
1606 }
|
|
|
1607
|
|
20
|
1608 DEFUN ("set", Fset, 2, 2, 0, /*
|
|
0
|
1609 Set SYMBOL's value to NEWVAL, and return NEWVAL.
|
|
20
|
1610 */
|
|
380
|
1611 (symbol, newval))
|
|
0
|
1612 {
|
|
|
1613 REGISTER Lisp_Object valcontents;
|
|
412
|
1614 struct Lisp_Symbol *sym;
|
|
0
|
1615 /* remember, we're called by Fmakunbound() as well */
|
|
|
1616
|
|
380
|
1617 CHECK_SYMBOL (symbol);
|
|
0
|
1618
|
|
|
1619 retry:
|
|
380
|
1620 sym = XSYMBOL (symbol);
|
|
|
1621 valcontents = sym->value;
|
|
|
1622
|
|
|
1623 if (EQ (symbol, Qnil) ||
|
|
|
1624 EQ (symbol, Qt) ||
|
|
|
1625 SYMBOL_IS_KEYWORD (symbol))
|
|
|
1626 reject_constant_symbols (symbol, newval, 0,
|
|
195
|
1627 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
380
|
1628
|
|
|
1629 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents))
|
|
195
|
1630 {
|
|
380
|
1631 sym->value = newval;
|
|
195
|
1632 return newval;
|
|
|
1633 }
|
|
|
1634
|
|
380
|
1635 reject_constant_symbols (symbol, newval, 0,
|
|
|
1636 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1637
|
|
412
|
1638 retry_2:
|
|
|
1639
|
|
380
|
1640 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
0
|
1641 {
|
|
380
|
1642 case SYMVAL_LISP_MAGIC:
|
|
|
1643 {
|
|
412
|
1644 Lisp_Object retval;
|
|
|
1645
|
|
380
|
1646 if (UNBOUNDP (newval))
|
|
412
|
1647 retval = maybe_call_magic_handler (symbol, Qmakunbound, 0);
|
|
380
|
1648 else
|
|
412
|
1649 retval = maybe_call_magic_handler (symbol, Qset, 1, newval);
|
|
|
1650 if (!UNBOUNDP (retval))
|
|
|
1651 return newval;
|
|
|
1652 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1653 /* semi-change-o */
|
|
|
1654 goto retry_2;
|
|
380
|
1655 }
|
|
|
1656
|
|
|
1657 case SYMVAL_VARALIAS:
|
|
|
1658 symbol = follow_varalias_pointers (symbol,
|
|
|
1659 UNBOUNDP (newval)
|
|
|
1660 ? Qmakunbound : Qset);
|
|
|
1661 /* presto change-o! */
|
|
|
1662 goto retry;
|
|
|
1663
|
|
|
1664 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1665 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1666 case SYMVAL_OBJECT_FORWARD:
|
|
|
1667 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1668 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1669 if (UNBOUNDP (newval))
|
|
|
1670 signal_error (Qerror,
|
|
|
1671 list2 (build_string ("Cannot makunbound"), symbol));
|
|
|
1672 break;
|
|
|
1673
|
|
|
1674 /* case SYMVAL_UNBOUND_MARKER: break; */
|
|
|
1675
|
|
|
1676 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1677 {
|
|
412
|
1678 CONST struct symbol_value_forward *fwd
|
|
380
|
1679 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1680 int mask = XINT (*((Lisp_Object *)
|
|
|
1681 symbol_value_forward_forward (fwd)));
|
|
|
1682 if (mask > 0)
|
|
|
1683 /* Setting this variable makes it buffer-local */
|
|
|
1684 current_buffer->local_var_flags |= mask;
|
|
|
1685 break;
|
|
|
1686 }
|
|
|
1687
|
|
|
1688 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1689 {
|
|
412
|
1690 CONST struct symbol_value_forward *fwd
|
|
380
|
1691 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1692 int mask = XINT (*((Lisp_Object *)
|
|
|
1693 symbol_value_forward_forward (fwd)));
|
|
|
1694 if (mask > 0)
|
|
|
1695 /* Setting this variable makes it console-local */
|
|
|
1696 XCONSOLE (Vselected_console)->local_var_flags |= mask;
|
|
|
1697 break;
|
|
|
1698 }
|
|
|
1699
|
|
|
1700 case SYMVAL_BUFFER_LOCAL:
|
|
|
1701 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1702 {
|
|
|
1703 /* If we want to examine or set the value and
|
|
|
1704 CURRENT-BUFFER is current, we just examine or set
|
|
|
1705 CURRENT-VALUE. If CURRENT-BUFFER is not current, we
|
|
|
1706 store the current CURRENT-VALUE value into
|
|
|
1707 CURRENT-ALIST- ELEMENT, then find the appropriate alist
|
|
|
1708 element for the buffer now current and set up
|
|
|
1709 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out
|
|
|
1710 of that element, and store into CURRENT-BUFFER.
|
|
|
1711
|
|
|
1712 If we are setting the variable and the current buffer does
|
|
|
1713 not have an alist entry for this variable, an alist entry is
|
|
|
1714 created.
|
|
|
1715
|
|
|
1716 Note that CURRENT-VALUE can be a forwarding pointer.
|
|
|
1717 Each time it is examined or set, forwarding must be
|
|
|
1718 done. */
|
|
|
1719 struct symbol_value_buffer_local *bfwd
|
|
|
1720 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1721 int some_buffer_local_p =
|
|
|
1722 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
1723 /* What value are we caching right now? */
|
|
|
1724 Lisp_Object aelt = bfwd->current_alist_element;
|
|
|
1725
|
|
|
1726 if (!NILP (bfwd->current_buffer) &&
|
|
|
1727 current_buffer == XBUFFER (bfwd->current_buffer)
|
|
|
1728 && ((some_buffer_local_p)
|
|
|
1729 ? 1 /* doesn't automatically become local */
|
|
|
1730 : !NILP (aelt) /* already local */
|
|
|
1731 ))
|
|
0
|
1732 {
|
|
380
|
1733 /* Cache is valid */
|
|
|
1734 valcontents = bfwd->current_value;
|
|
|
1735 }
|
|
|
1736 else
|
|
|
1737 {
|
|
|
1738 /* If the current buffer is not the buffer whose binding is
|
|
|
1739 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and
|
|
|
1740 we're looking at the default value, the cache is invalid; we
|
|
|
1741 need to write it out, and find the new CURRENT-ALIST-ELEMENT
|
|
|
1742 */
|
|
|
1743
|
|
|
1744 /* Write out the cached value for the old buffer; copy it
|
|
|
1745 back to its alist element. This works if the current
|
|
|
1746 buffer only sees the default value, too. */
|
|
|
1747 write_out_buffer_local_cache (symbol, bfwd);
|
|
|
1748
|
|
|
1749 /* Find the new value for CURRENT-ALIST-ELEMENT. */
|
|
|
1750 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd);
|
|
|
1751 if (NILP (aelt))
|
|
0
|
1752 {
|
|
380
|
1753 /* This buffer is still seeing the default value. */
|
|
|
1754 if (!some_buffer_local_p)
|
|
|
1755 {
|
|
|
1756 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a
|
|
|
1757 new assoc for a local value and set
|
|
|
1758 CURRENT-ALIST-ELEMENT to point to that. */
|
|
|
1759 aelt =
|
|
|
1760 do_symval_forwarding (bfwd->current_value,
|
|
|
1761 current_buffer,
|
|
|
1762 XCONSOLE (Vselected_console));
|
|
|
1763 aelt = Fcons (symbol, aelt);
|
|
|
1764 current_buffer->local_var_alist
|
|
|
1765 = Fcons (aelt, current_buffer->local_var_alist);
|
|
|
1766 }
|
|
|
1767 else
|
|
0
|
1768 {
|
|
380
|
1769 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL,
|
|
|
1770 we're currently seeing the default value. */
|
|
|
1771 ;
|
|
0
|
1772 }
|
|
|
1773 }
|
|
380
|
1774 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */
|
|
|
1775 bfwd->current_alist_element = aelt;
|
|
|
1776 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */
|
|
|
1777 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
1778 valcontents = bfwd->current_value;
|
|
0
|
1779 }
|
|
380
|
1780 break;
|
|
|
1781 }
|
|
|
1782 default:
|
|
|
1783 abort ();
|
|
0
|
1784 }
|
|
380
|
1785 store_symval_forwarding (symbol, valcontents, newval);
|
|
0
|
1786
|
|
173
|
1787 return newval;
|
|
0
|
1788 }
|
|
|
1789
|
|
|
1790
|
|
|
1791 /* Access or set a buffer-local symbol's default value. */
|
|
|
1792
|
|
|
1793 /* Return the default value of SYM, but don't check for voidness.
|
|
|
1794 Return Qunbound if it is void. */
|
|
|
1795
|
|
|
1796 static Lisp_Object
|
|
|
1797 default_value (Lisp_Object sym)
|
|
|
1798 {
|
|
|
1799 Lisp_Object valcontents;
|
|
|
1800
|
|
|
1801 CHECK_SYMBOL (sym);
|
|
|
1802
|
|
|
1803 retry:
|
|
|
1804 valcontents = XSYMBOL (sym)->value;
|
|
|
1805
|
|
|
1806 retry_2:
|
|
|
1807 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1808 return valcontents;
|
|
|
1809
|
|
0
|
1810 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1811 {
|
|
|
1812 case SYMVAL_LISP_MAGIC:
|
|
|
1813 /* #### kludge */
|
|
|
1814 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1815 /* semi-change-o */
|
|
|
1816 goto retry_2;
|
|
|
1817
|
|
|
1818 case SYMVAL_VARALIAS:
|
|
|
1819 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1820 /* presto change-o! */
|
|
|
1821 goto retry;
|
|
|
1822
|
|
|
1823 case SYMVAL_UNBOUND_MARKER:
|
|
|
1824 return valcontents;
|
|
|
1825
|
|
|
1826 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1827 {
|
|
412
|
1828 CONST struct symbol_value_forward *fwd
|
|
0
|
1829 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1830 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1831 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1832 - (char *)&buffer_local_flags))));
|
|
|
1833 }
|
|
|
1834
|
|
|
1835 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1836 {
|
|
412
|
1837 CONST struct symbol_value_forward *fwd
|
|
0
|
1838 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1839 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1840 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1841 - (char *)&console_local_flags))));
|
|
|
1842 }
|
|
|
1843
|
|
|
1844 case SYMVAL_BUFFER_LOCAL:
|
|
|
1845 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1846 {
|
|
173
|
1847 struct symbol_value_buffer_local *bfwd =
|
|
0
|
1848 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1849
|
|
|
1850 /* Handle user-created local variables. */
|
|
|
1851 /* If var is set up for a buffer that lacks a local value for it,
|
|
|
1852 the current value is nominally the default value.
|
|
|
1853 But the current value slot may be more up to date, since
|
|
|
1854 ordinary setq stores just that slot. So use that. */
|
|
|
1855 if (NILP (bfwd->current_alist_element))
|
|
173
|
1856 return do_symval_forwarding (bfwd->current_value, current_buffer,
|
|
|
1857 XCONSOLE (Vselected_console));
|
|
0
|
1858 else
|
|
173
|
1859 return bfwd->default_value;
|
|
0
|
1860 }
|
|
|
1861 default:
|
|
|
1862 /* For other variables, get the current value. */
|
|
173
|
1863 return do_symval_forwarding (valcontents, current_buffer,
|
|
|
1864 XCONSOLE (Vselected_console));
|
|
0
|
1865 }
|
|
173
|
1866
|
|
380
|
1867 RETURN_NOT_REACHED (Qnil) /* suppress compiler warning */
|
|
0
|
1868 }
|
|
|
1869
|
|
20
|
1870 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /*
|
|
272
|
1871 Return t if SYMBOL has a non-void default value.
|
|
0
|
1872 This is the value that is seen in buffers that do not have their own values
|
|
|
1873 for this variable.
|
|
20
|
1874 */
|
|
380
|
1875 (symbol))
|
|
0
|
1876 {
|
|
380
|
1877 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt;
|
|
0
|
1878 }
|
|
|
1879
|
|
20
|
1880 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /*
|
|
0
|
1881 Return SYMBOL's default value.
|
|
|
1882 This is the value that is seen in buffers that do not have their own values
|
|
|
1883 for this variable. The default value is meaningful for variables with
|
|
|
1884 local bindings in certain buffers.
|
|
20
|
1885 */
|
|
380
|
1886 (symbol))
|
|
0
|
1887 {
|
|
380
|
1888 Lisp_Object value = default_value (symbol);
|
|
|
1889
|
|
|
1890 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value;
|
|
0
|
1891 }
|
|
|
1892
|
|
20
|
1893 DEFUN ("set-default", Fset_default, 2, 2, 0, /*
|
|
0
|
1894 Set SYMBOL's default value to VAL. SYMBOL and VAL are evaluated.
|
|
|
1895 The default value is seen in buffers that do not have their own values
|
|
|
1896 for this variable.
|
|
20
|
1897 */
|
|
380
|
1898 (symbol, value))
|
|
0
|
1899 {
|
|
|
1900 Lisp_Object valcontents;
|
|
|
1901
|
|
380
|
1902 CHECK_SYMBOL (symbol);
|
|
0
|
1903
|
|
|
1904 retry:
|
|
380
|
1905 valcontents = XSYMBOL (symbol)->value;
|
|
0
|
1906
|
|
|
1907 retry_2:
|
|
|
1908 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
380
|
1909 return Fset (symbol, value);
|
|
0
|
1910
|
|
|
1911 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1912 {
|
|
|
1913 case SYMVAL_LISP_MAGIC:
|
|
380
|
1914 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1,
|
|
0
|
1915 value));
|
|
|
1916 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1917 /* semi-change-o */
|
|
|
1918 goto retry_2;
|
|
173
|
1919
|
|
0
|
1920 case SYMVAL_VARALIAS:
|
|
380
|
1921 symbol = follow_varalias_pointers (symbol, Qset_default);
|
|
0
|
1922 /* presto change-o! */
|
|
|
1923 goto retry;
|
|
|
1924
|
|
|
1925 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
380
|
1926 set_default_buffer_slot_variable (symbol, value);
|
|
173
|
1927 return value;
|
|
0
|
1928
|
|
|
1929 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
380
|
1930 set_default_console_slot_variable (symbol, value);
|
|
173
|
1931 return value;
|
|
0
|
1932
|
|
|
1933 case SYMVAL_BUFFER_LOCAL:
|
|
|
1934 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1935 {
|
|
|
1936 /* Store new value into the DEFAULT-VALUE slot */
|
|
|
1937 struct symbol_value_buffer_local *bfwd
|
|
|
1938 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1939
|
|
|
1940 bfwd->default_value = value;
|
|
|
1941 /* If current-buffer doesn't shadow default_value,
|
|
|
1942 * we must set the CURRENT-VALUE slot too */
|
|
|
1943 if (NILP (bfwd->current_alist_element))
|
|
380
|
1944 store_symval_forwarding (symbol, bfwd->current_value, value);
|
|
173
|
1945 return value;
|
|
0
|
1946 }
|
|
|
1947
|
|
|
1948 default:
|
|
380
|
1949 return Fset (symbol, value);
|
|
0
|
1950 }
|
|
|
1951 }
|
|
|
1952
|
|
380
|
1953 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /*
|
|
|
1954 Set the default value of variable SYMBOL to VALUE.
|
|
|
1955 SYMBOL, the variable name, is literal (not evaluated);
|
|
0
|
1956 VALUE is an expression and it is evaluated.
|
|
|
1957 The default value of a variable is seen in buffers
|
|
|
1958 that do not have their own values for the variable.
|
|
|
1959
|
|
|
1960 More generally, you can use multiple variables and values, as in
|
|
380
|
1961 (setq-default SYMBOL VALUE SYMBOL VALUE...)
|
|
|
1962 This sets each SYMBOL's default value to the corresponding VALUE.
|
|
|
1963 The VALUE for the Nth SYMBOL can refer to the new default values
|
|
|
1964 of previous SYMBOLs.
|
|
20
|
1965 */
|
|
|
1966 (args))
|
|
0
|
1967 {
|
|
|
1968 /* This function can GC */
|
|
380
|
1969 Lisp_Object symbol, tail, val = Qnil;
|
|
|
1970 int nargs;
|
|
0
|
1971 struct gcpro gcpro1;
|
|
|
1972
|
|
380
|
1973 GET_LIST_LENGTH (args, nargs);
|
|
|
1974
|
|
|
1975 if (nargs & 1) /* Odd number of arguments? */
|
|
|
1976 Fsignal (Qwrong_number_of_arguments,
|
|
|
1977 list2 (Qsetq_default, make_int (nargs)));
|
|
|
1978
|
|
|
1979 GCPRO1 (val);
|
|
|
1980
|
|
|
1981 PROPERTY_LIST_LOOP (tail, symbol, val, args)
|
|
0
|
1982 {
|
|
380
|
1983 val = Feval (val);
|
|
|
1984 Fset_default (symbol, val);
|
|
0
|
1985 }
|
|
|
1986
|
|
|
1987 UNGCPRO;
|
|
|
1988 return val;
|
|
|
1989 }
|
|
|
1990
|
|
|
1991 /* Lisp functions for creating and removing buffer-local variables. */
|
|
|
1992
|
|
20
|
1993 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1,
|
|
|
1994 "vMake Variable Buffer Local: ", /*
|
|
0
|
1995 Make VARIABLE have a separate value for each buffer.
|
|
|
1996 At any time, the value for the current buffer is in effect.
|
|
|
1997 There is also a default value which is seen in any buffer which has not yet
|
|
|
1998 set its own value.
|
|
|
1999 Using `set' or `setq' to set the variable causes it to have a separate value
|
|
|
2000 for the current buffer if it was previously using the default value.
|
|
|
2001 The function `default-value' gets the default value and `set-default'
|
|
|
2002 sets it.
|
|
20
|
2003 */
|
|
|
2004 (variable))
|
|
0
|
2005 {
|
|
|
2006 Lisp_Object valcontents;
|
|
|
2007
|
|
|
2008 CHECK_SYMBOL (variable);
|
|
|
2009
|
|
|
2010 retry:
|
|
|
2011 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local);
|
|
|
2012
|
|
|
2013 valcontents = XSYMBOL (variable)->value;
|
|
|
2014
|
|
|
2015 retry_2:
|
|
|
2016 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2017 {
|
|
|
2018 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2019 {
|
|
|
2020 case SYMVAL_LISP_MAGIC:
|
|
|
2021 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2022 (variable, Qmake_variable_buffer_local, 0)))
|
|
|
2023 return variable;
|
|
|
2024 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2025 /* semi-change-o */
|
|
|
2026 goto retry_2;
|
|
|
2027
|
|
|
2028 case SYMVAL_VARALIAS:
|
|
|
2029 variable = follow_varalias_pointers (variable,
|
|
|
2030 Qmake_variable_buffer_local);
|
|
|
2031 /* presto change-o! */
|
|
|
2032 goto retry;
|
|
|
2033
|
|
|
2034 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2035 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2036 case SYMVAL_OBJECT_FORWARD:
|
|
|
2037 case SYMVAL_UNBOUND_MARKER:
|
|
|
2038 break;
|
|
|
2039
|
|
|
2040 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2041 case SYMVAL_BUFFER_LOCAL:
|
|
|
2042 /* Already per-each-buffer */
|
|
173
|
2043 return variable;
|
|
0
|
2044
|
|
|
2045 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2046 /* Transmogrify */
|
|
|
2047 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type =
|
|
|
2048 SYMVAL_BUFFER_LOCAL;
|
|
173
|
2049 return variable;
|
|
0
|
2050
|
|
|
2051 default:
|
|
|
2052 abort ();
|
|
|
2053 }
|
|
|
2054 }
|
|
173
|
2055
|
|
0
|
2056 {
|
|
|
2057 struct symbol_value_buffer_local *bfwd
|
|
185
|
2058 = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
398
|
2059 &lrecord_symbol_value_buffer_local);
|
|
272
|
2060 Lisp_Object foo;
|
|
0
|
2061 bfwd->magic.type = SYMVAL_BUFFER_LOCAL;
|
|
|
2062
|
|
|
2063 bfwd->default_value = find_symbol_value (variable);
|
|
|
2064 bfwd->current_value = valcontents;
|
|
|
2065 bfwd->current_alist_element = Qnil;
|
|
|
2066 bfwd->current_buffer = Fcurrent_buffer ();
|
|
|
2067 XSETSYMBOL_VALUE_MAGIC (foo, bfwd);
|
|
|
2068 *value_slot_past_magic (variable) = foo;
|
|
|
2069 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/
|
|
|
2070 /* This sets the default-value of any make-variable-buffer-local to nil.
|
|
|
2071 That just sucks. User can just use setq-default to effect that,
|
|
|
2072 but there's no way to do makunbound-default to undo this lossage. */
|
|
|
2073 if (UNBOUNDP (valcontents))
|
|
|
2074 bfwd->default_value = Qnil;
|
|
|
2075 #endif
|
|
|
2076 #if 0 /* #### Yuck! */
|
|
|
2077 /* This sets the value to nil in this buffer.
|
|
|
2078 User could use (setq variable nil) to do this.
|
|
|
2079 It isn't as egregious to do this automatically
|
|
|
2080 as it is to do so to the default-value, but it's
|
|
|
2081 still really dubious. */
|
|
|
2082 if (UNBOUNDP (valcontents))
|
|
|
2083 Fset (variable, Qnil);
|
|
|
2084 #endif
|
|
272
|
2085 return variable;
|
|
0
|
2086 }
|
|
|
2087 }
|
|
|
2088
|
|
272
|
2089 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1,
|
|
|
2090 "vMake Local Variable: ", /*
|
|
0
|
2091 Make VARIABLE have a separate value in the current buffer.
|
|
|
2092 Other buffers will continue to share a common default value.
|
|
|
2093 \(The buffer-local value of VARIABLE starts out as the same value
|
|
|
2094 VARIABLE previously had. If VARIABLE was void, it remains void.)
|
|
|
2095 See also `make-variable-buffer-local'.
|
|
|
2096
|
|
|
2097 If the variable is already arranged to become local when set,
|
|
|
2098 this function causes a local value to exist for this buffer,
|
|
|
2099 just as setting the variable would do.
|
|
|
2100
|
|
|
2101 Do not use `make-local-variable' to make a hook variable buffer-local.
|
|
|
2102 Use `make-local-hook' instead.
|
|
20
|
2103 */
|
|
|
2104 (variable))
|
|
0
|
2105 {
|
|
|
2106 Lisp_Object valcontents;
|
|
|
2107 struct symbol_value_buffer_local *bfwd;
|
|
|
2108
|
|
|
2109 CHECK_SYMBOL (variable);
|
|
|
2110
|
|
|
2111 retry:
|
|
|
2112 verify_ok_for_buffer_local (variable, Qmake_local_variable);
|
|
|
2113
|
|
|
2114 valcontents = XSYMBOL (variable)->value;
|
|
|
2115
|
|
|
2116 retry_2:
|
|
|
2117 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2118 {
|
|
|
2119 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2120 {
|
|
|
2121 case SYMVAL_LISP_MAGIC:
|
|
|
2122 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2123 (variable, Qmake_local_variable, 0)))
|
|
|
2124 return variable;
|
|
|
2125 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2126 /* semi-change-o */
|
|
|
2127 goto retry_2;
|
|
|
2128
|
|
|
2129 case SYMVAL_VARALIAS:
|
|
|
2130 variable = follow_varalias_pointers (variable, Qmake_local_variable);
|
|
|
2131 /* presto change-o! */
|
|
|
2132 goto retry;
|
|
|
2133
|
|
|
2134 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2135 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2136 case SYMVAL_OBJECT_FORWARD:
|
|
|
2137 case SYMVAL_UNBOUND_MARKER:
|
|
|
2138 break;
|
|
|
2139
|
|
|
2140 case SYMVAL_BUFFER_LOCAL:
|
|
|
2141 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2142 {
|
|
|
2143 /* Make sure the symbol has a local value in this particular
|
|
|
2144 buffer, by setting it to the same value it already has. */
|
|
|
2145 Fset (variable, find_symbol_value (variable));
|
|
173
|
2146 return variable;
|
|
0
|
2147 }
|
|
|
2148
|
|
|
2149 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2150 {
|
|
|
2151 if (!NILP (buffer_local_alist_element (current_buffer,
|
|
|
2152 variable,
|
|
|
2153 (XSYMBOL_VALUE_BUFFER_LOCAL
|
|
|
2154 (valcontents)))))
|
|
|
2155 goto already_local_to_current_buffer;
|
|
|
2156 else
|
|
|
2157 goto already_local_to_some_other_buffer;
|
|
|
2158 }
|
|
|
2159
|
|
|
2160 default:
|
|
|
2161 abort ();
|
|
|
2162 }
|
|
|
2163 }
|
|
|
2164
|
|
|
2165 /* Make sure variable is set up to hold per-buffer values */
|
|
185
|
2166 bfwd = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
398
|
2167 &lrecord_symbol_value_buffer_local);
|
|
0
|
2168 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL;
|
|
|
2169
|
|
|
2170 bfwd->current_buffer = Qnil;
|
|
|
2171 bfwd->current_alist_element = Qnil;
|
|
|
2172 bfwd->current_value = valcontents;
|
|
|
2173 /* passing 0 is OK because this should never be a
|
|
|
2174 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD
|
|
|
2175 variable. */
|
|
|
2176 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0);
|
|
|
2177
|
|
|
2178 #if 0
|
|
|
2179 if (UNBOUNDP (bfwd->default_value))
|
|
|
2180 bfwd->default_value = Qnil; /* Yuck! */
|
|
|
2181 #endif
|
|
|
2182
|
|
|
2183 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
2184 *value_slot_past_magic (variable) = valcontents;
|
|
|
2185
|
|
|
2186 already_local_to_some_other_buffer:
|
|
|
2187
|
|
|
2188 /* Make sure this buffer has its own value of variable */
|
|
|
2189 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2190
|
|
|
2191 if (UNBOUNDP (bfwd->default_value))
|
|
|
2192 {
|
|
|
2193 /* If default value is unbound, set local value to nil. */
|
|
|
2194 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
2195 bfwd->current_alist_element = Fcons (variable, Qnil);
|
|
|
2196 current_buffer->local_var_alist =
|
|
|
2197 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist);
|
|
|
2198 store_symval_forwarding (variable, bfwd->current_value, Qnil);
|
|
173
|
2199 return variable;
|
|
0
|
2200 }
|
|
|
2201
|
|
|
2202 current_buffer->local_var_alist
|
|
|
2203 = Fcons (Fcons (variable, bfwd->default_value),
|
|
|
2204 current_buffer->local_var_alist);
|
|
|
2205
|
|
|
2206 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2207 force it to look once again for this buffer's value */
|
|
|
2208 if (!NILP (bfwd->current_buffer) &&
|
|
|
2209 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2210 bfwd->current_buffer = Qnil;
|
|
|
2211
|
|
|
2212 already_local_to_current_buffer:
|
|
|
2213
|
|
|
2214 /* If the symbol forwards into a C variable, then swap in the
|
|
|
2215 variable for this buffer immediately. If C code modifies the
|
|
|
2216 variable before we swap in, then that new value will clobber the
|
|
|
2217 default value the next time we swap. */
|
|
|
2218 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2219 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value))
|
|
|
2220 {
|
|
|
2221 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value))
|
|
|
2222 {
|
|
|
2223 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2224 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2225 case SYMVAL_OBJECT_FORWARD:
|
|
|
2226 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
82
|
2227 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
0
|
2228 break;
|
|
|
2229
|
|
|
2230 case SYMVAL_UNBOUND_MARKER:
|
|
|
2231 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2232 break;
|
|
|
2233
|
|
|
2234 default:
|
|
|
2235 abort ();
|
|
|
2236 }
|
|
|
2237 }
|
|
|
2238
|
|
173
|
2239 return variable;
|
|
0
|
2240 }
|
|
|
2241
|
|
272
|
2242 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1,
|
|
|
2243 "vKill Local Variable: ", /*
|
|
0
|
2244 Make VARIABLE no longer have a separate value in the current buffer.
|
|
|
2245 From now on the default value will apply in this buffer.
|
|
20
|
2246 */
|
|
|
2247 (variable))
|
|
0
|
2248 {
|
|
|
2249 Lisp_Object valcontents;
|
|
|
2250
|
|
|
2251 CHECK_SYMBOL (variable);
|
|
|
2252
|
|
|
2253 retry:
|
|
|
2254 valcontents = XSYMBOL (variable)->value;
|
|
|
2255
|
|
|
2256 retry_2:
|
|
|
2257 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
2258 return variable;
|
|
0
|
2259
|
|
|
2260 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2261 {
|
|
|
2262 case SYMVAL_LISP_MAGIC:
|
|
|
2263 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2264 (variable, Qkill_local_variable, 0)))
|
|
|
2265 return variable;
|
|
|
2266 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2267 /* semi-change-o */
|
|
|
2268 goto retry_2;
|
|
|
2269
|
|
|
2270 case SYMVAL_VARALIAS:
|
|
|
2271 variable = follow_varalias_pointers (variable, Qkill_local_variable);
|
|
|
2272 /* presto change-o! */
|
|
|
2273 goto retry;
|
|
|
2274
|
|
|
2275 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2276 {
|
|
412
|
2277 CONST struct symbol_value_forward *fwd
|
|
0
|
2278 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
2279 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
2280 - (char *) &buffer_local_flags);
|
|
|
2281 int mask =
|
|
|
2282 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2283
|
|
|
2284 if (mask > 0)
|
|
|
2285 {
|
|
|
2286 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2287 Lisp_Object in_object, int flags) =
|
|
|
2288 symbol_value_forward_magicfun (fwd);
|
|
|
2289 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2290 (offset + (char *) XBUFFER (Vbuffer_defaults));
|
|
|
2291 if (magicfun)
|
|
|
2292 (magicfun) (variable, &oldval, make_buffer (current_buffer), 0);
|
|
|
2293 *(Lisp_Object *) (offset + (char *) current_buffer)
|
|
|
2294 = oldval;
|
|
|
2295 current_buffer->local_var_flags &= ~mask;
|
|
|
2296 }
|
|
173
|
2297 return variable;
|
|
0
|
2298 }
|
|
|
2299
|
|
|
2300 case SYMVAL_BUFFER_LOCAL:
|
|
|
2301 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2302 {
|
|
|
2303 /* Get rid of this buffer's alist element, if any */
|
|
|
2304 struct symbol_value_buffer_local *bfwd
|
|
|
2305 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2306 Lisp_Object alist = current_buffer->local_var_alist;
|
|
|
2307 Lisp_Object alist_element
|
|
|
2308 = buffer_local_alist_element (current_buffer, variable, bfwd);
|
|
|
2309
|
|
|
2310 if (!NILP (alist_element))
|
|
|
2311 current_buffer->local_var_alist = Fdelq (alist_element, alist);
|
|
|
2312
|
|
|
2313 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2314 force it to look once again for this buffer's value */
|
|
|
2315 if (!NILP (bfwd->current_buffer) &&
|
|
|
2316 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2317 bfwd->current_buffer = Qnil;
|
|
|
2318
|
|
|
2319 /* We just changed the value in the current_buffer. If this
|
|
|
2320 variable forwards to a C variable, we need to change the
|
|
|
2321 value of the C variable. set_up_buffer_local_cache()
|
|
|
2322 will do this. It doesn't hurt to do it always,
|
|
|
2323 so just go ahead and do that. */
|
|
82
|
2324 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
0
|
2325 }
|
|
173
|
2326 return variable;
|
|
0
|
2327
|
|
|
2328 default:
|
|
173
|
2329 return variable;
|
|
0
|
2330 }
|
|
|
2331 RETURN_NOT_REACHED(Qnil) /* suppress compiler warning */
|
|
|
2332 }
|
|
|
2333
|
|
|
2334
|
|
272
|
2335 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1,
|
|
|
2336 "vKill Console Local Variable: ", /*
|
|
0
|
2337 Make VARIABLE no longer have a separate value in the selected console.
|
|
|
2338 From now on the default value will apply in this console.
|
|
20
|
2339 */
|
|
|
2340 (variable))
|
|
0
|
2341 {
|
|
|
2342 Lisp_Object valcontents;
|
|
|
2343
|
|
|
2344 CHECK_SYMBOL (variable);
|
|
|
2345
|
|
|
2346 retry:
|
|
|
2347 valcontents = XSYMBOL (variable)->value;
|
|
|
2348
|
|
|
2349 retry_2:
|
|
|
2350 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
2351 return variable;
|
|
0
|
2352
|
|
|
2353 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2354 {
|
|
|
2355 case SYMVAL_LISP_MAGIC:
|
|
|
2356 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2357 (variable, Qkill_console_local_variable, 0)))
|
|
|
2358 return variable;
|
|
|
2359 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2360 /* semi-change-o */
|
|
|
2361 goto retry_2;
|
|
|
2362
|
|
|
2363 case SYMVAL_VARALIAS:
|
|
|
2364 variable = follow_varalias_pointers (variable,
|
|
|
2365 Qkill_console_local_variable);
|
|
|
2366 /* presto change-o! */
|
|
|
2367 goto retry;
|
|
|
2368
|
|
|
2369 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
2370 {
|
|
412
|
2371 CONST struct symbol_value_forward *fwd
|
|
0
|
2372 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
2373 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
2374 - (char *) &console_local_flags);
|
|
|
2375 int mask =
|
|
|
2376 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2377
|
|
|
2378 if (mask > 0)
|
|
|
2379 {
|
|
|
2380 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2381 Lisp_Object in_object, int flags) =
|
|
|
2382 symbol_value_forward_magicfun (fwd);
|
|
|
2383 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2384 (offset + (char *) XCONSOLE (Vconsole_defaults));
|
|
|
2385 if (magicfun)
|
|
380
|
2386 magicfun (variable, &oldval, Vselected_console, 0);
|
|
0
|
2387 *(Lisp_Object *) (offset + (char *) XCONSOLE (Vselected_console))
|
|
|
2388 = oldval;
|
|
|
2389 XCONSOLE (Vselected_console)->local_var_flags &= ~mask;
|
|
|
2390 }
|
|
173
|
2391 return variable;
|
|
0
|
2392 }
|
|
|
2393
|
|
|
2394 default:
|
|
173
|
2395 return variable;
|
|
0
|
2396 }
|
|
|
2397 }
|
|
|
2398
|
|
|
2399 /* Used by specbind to determine what effects it might have. Returns:
|
|
|
2400 * 0 if symbol isn't buffer-local, and wouldn't be after it is set
|
|
|
2401 * <0 if symbol isn't presently buffer-local, but set would make it so
|
|
|
2402 * >0 if symbol is presently buffer-local
|
|
|
2403 */
|
|
|
2404 int
|
|
|
2405 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer)
|
|
|
2406 {
|
|
|
2407 Lisp_Object valcontents;
|
|
|
2408
|
|
|
2409 retry:
|
|
|
2410 valcontents = XSYMBOL (symbol)->value;
|
|
|
2411
|
|
|
2412 retry_2:
|
|
|
2413 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2414 {
|
|
|
2415 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2416 {
|
|
|
2417 case SYMVAL_LISP_MAGIC:
|
|
|
2418 /* #### kludge */
|
|
|
2419 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2420 /* semi-change-o */
|
|
|
2421 goto retry_2;
|
|
|
2422
|
|
|
2423 case SYMVAL_VARALIAS:
|
|
|
2424 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */);
|
|
|
2425 /* presto change-o! */
|
|
|
2426 goto retry;
|
|
|
2427
|
|
|
2428 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2429 {
|
|
412
|
2430 CONST struct symbol_value_forward *fwd
|
|
0
|
2431 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2432 int mask = XINT (*((Lisp_Object *)
|
|
|
2433 symbol_value_forward_forward (fwd)));
|
|
|
2434 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask)))
|
|
|
2435 /* Already buffer-local */
|
|
173
|
2436 return 1;
|
|
0
|
2437 else
|
|
|
2438 /* Would be buffer-local after set */
|
|
173
|
2439 return -1;
|
|
0
|
2440 }
|
|
|
2441 case SYMVAL_BUFFER_LOCAL:
|
|
|
2442 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2443 {
|
|
|
2444 struct symbol_value_buffer_local *bfwd
|
|
|
2445 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2446 if (buffer
|
|
|
2447 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd)))
|
|
173
|
2448 return 1;
|
|
0
|
2449 else
|
|
173
|
2450 /* Automatically becomes local when set */
|
|
|
2451 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0;
|
|
0
|
2452 }
|
|
|
2453 default:
|
|
173
|
2454 return 0;
|
|
0
|
2455 }
|
|
|
2456 }
|
|
173
|
2457 return 0;
|
|
0
|
2458 }
|
|
|
2459
|
|
|
2460
|
|
20
|
2461 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /*
|
|
0
|
2462 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound.
|
|
20
|
2463 */
|
|
|
2464 (symbol, buffer, unbound_value))
|
|
0
|
2465 {
|
|
|
2466 Lisp_Object value;
|
|
|
2467 CHECK_SYMBOL (symbol);
|
|
|
2468 CHECK_BUFFER (buffer);
|
|
|
2469 value = symbol_value_in_buffer (symbol, buffer);
|
|
380
|
2470 return UNBOUNDP (value) ? unbound_value : value;
|
|
0
|
2471 }
|
|
|
2472
|
|
20
|
2473 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /*
|
|
0
|
2474 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound.
|
|
20
|
2475 */
|
|
|
2476 (symbol, console, unbound_value))
|
|
0
|
2477 {
|
|
|
2478 Lisp_Object value;
|
|
|
2479 CHECK_SYMBOL (symbol);
|
|
|
2480 CHECK_CONSOLE (console);
|
|
|
2481 value = symbol_value_in_console (symbol, console);
|
|
380
|
2482 return UNBOUNDP (value) ? unbound_value : value;
|
|
0
|
2483 }
|
|
|
2484
|
|
20
|
2485 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /*
|
|
380
|
2486 If SYMBOL is a built-in variable, return info about this; else return nil.
|
|
0
|
2487 The returned info will be a symbol, one of
|
|
|
2488
|
|
|
2489 `object' A simple built-in variable.
|
|
|
2490 `const-object' Same, but cannot be set.
|
|
|
2491 `integer' A built-in integer variable.
|
|
|
2492 `const-integer' Same, but cannot be set.
|
|
|
2493 `boolean' A built-in boolean variable.
|
|
|
2494 `const-boolean' Same, but cannot be set.
|
|
|
2495 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'.
|
|
|
2496 `current-buffer' A built-in buffer-local variable.
|
|
|
2497 `const-current-buffer' Same, but cannot be set.
|
|
|
2498 `default-buffer' Forwards to the default value of a built-in
|
|
|
2499 buffer-local variable.
|
|
|
2500 `selected-console' A built-in console-local variable.
|
|
|
2501 `const-selected-console' Same, but cannot be set.
|
|
|
2502 `default-console' Forwards to the default value of a built-in
|
|
|
2503 console-local variable.
|
|
20
|
2504 */
|
|
380
|
2505 (symbol))
|
|
0
|
2506 {
|
|
|
2507 REGISTER Lisp_Object valcontents;
|
|
|
2508
|
|
380
|
2509 CHECK_SYMBOL (symbol);
|
|
0
|
2510
|
|
|
2511 retry:
|
|
380
|
2512 valcontents = XSYMBOL (symbol)->value;
|
|
|
2513
|
|
0
|
2514 retry_2:
|
|
380
|
2515 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2516 return Qnil;
|
|
|
2517
|
|
|
2518 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
0
|
2519 {
|
|
380
|
2520 case SYMVAL_LISP_MAGIC:
|
|
|
2521 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2522 /* semi-change-o */
|
|
|
2523 goto retry_2;
|
|
|
2524
|
|
|
2525 case SYMVAL_VARALIAS:
|
|
|
2526 symbol = follow_varalias_pointers (symbol, Qt);
|
|
|
2527 /* presto change-o! */
|
|
|
2528 goto retry;
|
|
|
2529
|
|
|
2530 case SYMVAL_BUFFER_LOCAL:
|
|
|
2531 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2532 valcontents =
|
|
|
2533 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value;
|
|
|
2534 /* semi-change-o */
|
|
|
2535 goto retry_2;
|
|
|
2536
|
|
|
2537 case SYMVAL_FIXNUM_FORWARD: return Qinteger;
|
|
|
2538 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer;
|
|
|
2539 case SYMVAL_BOOLEAN_FORWARD: return Qboolean;
|
|
|
2540 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean;
|
|
|
2541 case SYMVAL_OBJECT_FORWARD: return Qobject;
|
|
|
2542 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object;
|
|
|
2543 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier;
|
|
|
2544 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer;
|
|
|
2545 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer;
|
|
|
2546 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer;
|
|
|
2547 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console;
|
|
|
2548 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console;
|
|
|
2549 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console;
|
|
|
2550 case SYMVAL_UNBOUND_MARKER: return Qnil;
|
|
|
2551
|
|
|
2552 default:
|
|
|
2553 abort (); return Qnil;
|
|
0
|
2554 }
|
|
|
2555 }
|
|
|
2556
|
|
|
2557
|
|
20
|
2558 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /*
|
|
0
|
2559 Return t if SYMBOL's value is local to BUFFER.
|
|
|
2560 If optional third arg AFTER-SET is true, return t if SYMBOL would be
|
|
|
2561 buffer-local after it is set, regardless of whether it is so presently.
|
|
|
2562 A nil value for BUFFER is *not* the same as (current-buffer), but means
|
|
|
2563 "no buffer". Specifically:
|
|
|
2564
|
|
|
2565 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that
|
|
|
2566 the variable is one of the special built-in variables that is always
|
|
|
2567 buffer-local. (This includes `buffer-file-name', `buffer-read-only',
|
|
|
2568 `buffer-undo-list', and others.)
|
|
|
2569
|
|
|
2570 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that
|
|
|
2571 the variable has had `make-variable-buffer-local' applied to it.
|
|
20
|
2572 */
|
|
|
2573 (symbol, buffer, after_set))
|
|
0
|
2574 {
|
|
|
2575 int local_info;
|
|
173
|
2576
|
|
0
|
2577 CHECK_SYMBOL (symbol);
|
|
|
2578 if (!NILP (buffer))
|
|
|
2579 {
|
|
|
2580 buffer = get_buffer (buffer, 1);
|
|
|
2581 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer));
|
|
|
2582 }
|
|
|
2583 else
|
|
|
2584 {
|
|
|
2585 local_info = symbol_value_buffer_local_info (symbol, 0);
|
|
|
2586 }
|
|
173
|
2587
|
|
0
|
2588 if (NILP (after_set))
|
|
173
|
2589 return local_info > 0 ? Qt : Qnil;
|
|
0
|
2590 else
|
|
173
|
2591 return local_info != 0 ? Qt : Qnil;
|
|
0
|
2592 }
|
|
|
2593
|
|
|
2594
|
|
173
|
2595 /*
|
|
0
|
2596 I've gone ahead and partially implemented this because it's
|
|
|
2597 super-useful for dealing with the compatibility problems in supporting
|
|
|
2598 the old pointer-shape variables, and preventing people from `setq'ing
|
|
|
2599 the new variables. Any other way of handling this problem is way
|
|
|
2600 ugly, likely to be slow, and generally not something I want to waste
|
|
|
2601 my time worrying about.
|
|
|
2602
|
|
|
2603 The interface and/or function name is sure to change before this
|
|
|
2604 gets into its final form. I currently like the way everything is
|
|
|
2605 set up and it has all the features I want it to have, except for
|
|
|
2606 one: I really want to be able to have multiple nested handlers,
|
|
380
|
2607 to implement an `advice'-like capability. This would allow,
|
|
0
|
2608 for example, a clean way of implementing `debug-if-set' or
|
|
|
2609 `debug-if-referenced' and such.
|
|
|
2610
|
|
|
2611 NOTE NOTE NOTE NOTE NOTE NOTE NOTE:
|
|
|
2612 ************************************************************
|
|
|
2613 **Only** the `set-value', `make-unbound', and `make-local'
|
|
|
2614 handler types are currently implemented. Implementing the
|
|
|
2615 get-value and bound-predicate handlers is somewhat tricky
|
|
|
2616 because there are lots of subfunctions (e.g. find_symbol_value()).
|
|
|
2617 find_symbol_value(), in fact, is called from outside of
|
|
|
2618 this module. You'd have to have it do this:
|
|
|
2619
|
|
|
2620 -- check for a `bound-predicate' handler, call that if so;
|
|
|
2621 if it returns nil, return Qunbound
|
|
|
2622 -- check for a `get-value' handler and call it and return
|
|
|
2623 that value
|
|
|
2624
|
|
|
2625 It gets even trickier when you have to deal with
|
|
|
2626 sub-subfunctions like find_symbol_value_1(), and esp.
|
|
|
2627 when you have to properly handle variable aliases, which
|
|
|
2628 can lead to lots of tricky situations. So I've just
|
|
|
2629 punted on this, since the interface isn't officially
|
|
|
2630 exported and we can get by with just a `set-value'
|
|
|
2631 handler.
|
|
|
2632
|
|
|
2633 Actions in unimplemented handler types will correctly
|
|
|
2634 ignore any handlers, and will not fuck anything up or
|
|
|
2635 go awry.
|
|
|
2636
|
|
|
2637 WARNING WARNING: If you do go and implement another
|
|
|
2638 type of handler, make *sure* to change
|
|
|
2639 would_be_magic_handled() so it knows about this,
|
|
|
2640 or dire things could result.
|
|
|
2641 ************************************************************
|
|
|
2642 NOTE NOTE NOTE NOTE NOTE NOTE NOTE
|
|
|
2643
|
|
173
|
2644 Real documentation is as follows.
|
|
0
|
2645
|
|
|
2646 Set a magic handler for VARIABLE.
|
|
|
2647 This allows you to specify arbitrary behavior that results from
|
|
|
2648 accessing or setting a variable. For example, retrieving the
|
|
|
2649 variable's value might actually retrieve the first element off of
|
|
|
2650 a list stored in another variable, and setting the variable's value
|
|
|
2651 might add an element to the front of that list. (This is how the
|
|
|
2652 obsolete variable `unread-command-event' is implemented.)
|
|
|
2653
|
|
|
2654 In general it is NOT good programming practice to use magic variables
|
|
|
2655 in a new package that you are designing. If you feel the need to
|
|
|
2656 do this, it's almost certainly a sign that you should be using a
|
|
|
2657 function instead of a variable. This facility is provided to allow
|
|
|
2658 a package to support obsolete variables and provide compatibility
|
|
|
2659 with similar packages with different variable names and semantics.
|
|
|
2660 By using magic handlers, you can cleanly provide obsoleteness and
|
|
|
2661 compatibility support and separate this support from the core
|
|
|
2662 routines in a package.
|
|
|
2663
|
|
|
2664 VARIABLE should be a symbol naming the variable for which the
|
|
|
2665 magic behavior is provided. HANDLER-TYPE is a symbol specifying
|
|
|
2666 which behavior is being controlled, and HANDLER is the function
|
|
|
2667 that will be called to control this behavior. HARG is a
|
|
|
2668 value that will be passed to HANDLER but is otherwise
|
|
|
2669 uninterpreted. KEEP-EXISTING specifies what to do with existing
|
|
185
|
2670 handlers of the same type; nil means "erase them all", t means
|
|
|
2671 "keep them but insert at the beginning", the list (t) means
|
|
|
2672 "keep them but insert at the end", a function means "keep
|
|
|
2673 them but insert before the specified function", a list containing
|
|
|
2674 a function means "keep them but insert after the specified
|
|
|
2675 function".
|
|
0
|
2676
|
|
|
2677 You can specify magic behavior for any type of variable at all,
|
|
|
2678 and for any handler types that are unspecified, the standard
|
|
|
2679 behavior applies. This allows you, for example, to use
|
|
|
2680 `defvaralias' in conjunction with this function. (For that
|
|
|
2681 matter, `defvaralias' could be implemented using this function.)
|
|
|
2682
|
|
|
2683 The behaviors that can be specified in HANDLER-TYPE are
|
|
|
2684
|
|
|
2685 get-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2686 This means that one of the functions `symbol-value',
|
|
|
2687 `default-value', `symbol-value-in-buffer', or
|
|
|
2688 `symbol-value-in-console' was called on SYM.
|
|
|
2689
|
|
|
2690 set-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2691 This means that one of the functions `set' or `set-default'
|
|
|
2692 was called on SYM.
|
|
|
2693
|
|
|
2694 bound-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2695 This means that one of the functions `boundp', `globally-boundp',
|
|
|
2696 or `default-boundp' was called on SYM.
|
|
|
2697
|
|
|
2698 make-unbound (SYM ARGS FUN HARG HANDLERS)
|
|
|
2699 This means that the function `makunbound' was called on SYM.
|
|
|
2700
|
|
|
2701 local-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2702 This means that the function `local-variable-p' was called
|
|
|
2703 on SYM.
|
|
|
2704
|
|
|
2705 make-local (SYM ARGS FUN HARG HANDLERS)
|
|
|
2706 This means that one of the functions `make-local-variable',
|
|
|
2707 `make-variable-buffer-local', `kill-local-variable',
|
|
|
2708 or `kill-console-local-variable' was called on SYM.
|
|
|
2709
|
|
|
2710 The meanings of the arguments are as follows:
|
|
|
2711
|
|
|
2712 SYM is the symbol on which the function was called, and is always
|
|
|
2713 the first argument to the function.
|
|
173
|
2714
|
|
0
|
2715 ARGS are the remaining arguments in the original call (i.e. all
|
|
|
2716 but the first). In the case of `set-value' in particular,
|
|
|
2717 the first element of ARGS is the value to which the variable
|
|
|
2718 is being set. In some cases, ARGS is sanitized from what was
|
|
|
2719 actually given. For example, whenever `nil' is passed to an
|
|
|
2720 argument and it means `current-buffer', the current buffer is
|
|
|
2721 substituted instead.
|
|
173
|
2722
|
|
0
|
2723 FUN is a symbol indicating which function is being called.
|
|
|
2724 For many of the functions, you can determine the corresponding
|
|
|
2725 function of a different class using
|
|
|
2726 `symbol-function-corresponding-function'.
|
|
173
|
2727
|
|
0
|
2728 HARG is the argument that was given in the call
|
|
|
2729 to `set-symbol-value-handler' for SYM and HANDLER-TYPE.
|
|
173
|
2730
|
|
0
|
2731 HANDLERS is a structure containing the remaining handlers
|
|
|
2732 for the variable; to call one of them, use
|
|
|
2733 `chain-to-symbol-value-handler'.
|
|
|
2734
|
|
|
2735 NOTE: You may *not* modify the list in ARGS, and if you want to
|
|
|
2736 keep it around after the handler function exits, you must make
|
|
|
2737 a copy using `copy-sequence'. (Same caveats for HANDLERS also.)
|
|
|
2738 */
|
|
|
2739
|
|
|
2740 static enum lisp_magic_handler
|
|
|
2741 decode_magic_handler_type (Lisp_Object symbol)
|
|
|
2742 {
|
|
173
|
2743 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE;
|
|
|
2744 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE;
|
|
|
2745 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2746 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2747 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2748 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2749
|
|
0
|
2750 signal_simple_error ("Unrecognized symbol value handler type", symbol);
|
|
|
2751 abort ();
|
|
|
2752 return MAGIC_HANDLER_MAX;
|
|
|
2753 }
|
|
|
2754
|
|
|
2755 static enum lisp_magic_handler
|
|
|
2756 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found)
|
|
|
2757 {
|
|
|
2758 if (EQ (funsym, Qsymbol_value)
|
|
|
2759 || EQ (funsym, Qdefault_value)
|
|
|
2760 || EQ (funsym, Qsymbol_value_in_buffer)
|
|
|
2761 || EQ (funsym, Qsymbol_value_in_console))
|
|
|
2762 return MAGIC_HANDLER_GET_VALUE;
|
|
|
2763
|
|
|
2764 if (EQ (funsym, Qset)
|
|
|
2765 || EQ (funsym, Qset_default))
|
|
|
2766 return MAGIC_HANDLER_SET_VALUE;
|
|
|
2767
|
|
|
2768 if (EQ (funsym, Qboundp)
|
|
|
2769 || EQ (funsym, Qglobally_boundp)
|
|
|
2770 || EQ (funsym, Qdefault_boundp))
|
|
|
2771 return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2772
|
|
|
2773 if (EQ (funsym, Qmakunbound))
|
|
|
2774 return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2775
|
|
|
2776 if (EQ (funsym, Qlocal_variable_p))
|
|
|
2777 return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2778
|
|
|
2779 if (EQ (funsym, Qmake_variable_buffer_local)
|
|
|
2780 || EQ (funsym, Qmake_local_variable))
|
|
|
2781 return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2782
|
|
|
2783 if (abort_if_not_found)
|
|
|
2784 abort ();
|
|
|
2785 signal_simple_error ("Unrecognized symbol-value function", funsym);
|
|
|
2786 return MAGIC_HANDLER_MAX;
|
|
|
2787 }
|
|
|
2788
|
|
|
2789 static int
|
|
|
2790 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym)
|
|
|
2791 {
|
|
|
2792 /* does not take into account variable aliasing. */
|
|
|
2793 Lisp_Object valcontents = XSYMBOL (sym)->value;
|
|
|
2794 enum lisp_magic_handler slot;
|
|
|
2795
|
|
|
2796 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2797 return 0;
|
|
|
2798 slot = handler_type_from_function_symbol (funsym, 1);
|
|
|
2799 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND
|
|
|
2800 && slot != MAGIC_HANDLER_MAKE_LOCAL)
|
|
|
2801 /* #### temporary kludge because we haven't implemented
|
|
|
2802 lisp-magic variables completely */
|
|
|
2803 return 0;
|
|
|
2804 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]);
|
|
|
2805 }
|
|
|
2806
|
|
|
2807 static Lisp_Object
|
|
|
2808 fetch_value_maybe_past_magic (Lisp_Object sym,
|
|
|
2809 Lisp_Object follow_past_lisp_magic)
|
|
|
2810 {
|
|
|
2811 Lisp_Object value = XSYMBOL (sym)->value;
|
|
|
2812 if (SYMBOL_VALUE_LISP_MAGIC_P (value)
|
|
|
2813 && (EQ (follow_past_lisp_magic, Qt)
|
|
|
2814 || (!NILP (follow_past_lisp_magic)
|
|
|
2815 && !would_be_magic_handled (sym, follow_past_lisp_magic))))
|
|
|
2816 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed;
|
|
|
2817 return value;
|
|
|
2818 }
|
|
|
2819
|
|
|
2820 static Lisp_Object *
|
|
|
2821 value_slot_past_magic (Lisp_Object sym)
|
|
|
2822 {
|
|
|
2823 Lisp_Object *store_pointer = &XSYMBOL (sym)->value;
|
|
|
2824
|
|
|
2825 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer))
|
|
|
2826 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed;
|
|
|
2827 return store_pointer;
|
|
|
2828 }
|
|
|
2829
|
|
|
2830 static Lisp_Object
|
|
|
2831 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...)
|
|
|
2832 {
|
|
|
2833 va_list vargs;
|
|
|
2834 Lisp_Object args[20]; /* should be enough ... */
|
|
|
2835 int i;
|
|
|
2836 enum lisp_magic_handler htype;
|
|
|
2837 Lisp_Object legerdemain;
|
|
|
2838 struct symbol_value_lisp_magic *bfwd;
|
|
|
2839
|
|
412
|
2840 assert (nargs >= 0 && nargs < 20);
|
|
0
|
2841 legerdemain = XSYMBOL (sym)->value;
|
|
|
2842 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain));
|
|
|
2843 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain);
|
|
|
2844
|
|
|
2845 va_start (vargs, nargs);
|
|
|
2846 for (i = 0; i < nargs; i++)
|
|
|
2847 args[i] = va_arg (vargs, Lisp_Object);
|
|
|
2848 va_end (vargs);
|
|
|
2849
|
|
|
2850 htype = handler_type_from_function_symbol (funsym, 1);
|
|
|
2851 if (NILP (bfwd->handler[htype]))
|
|
|
2852 return Qunbound;
|
|
|
2853 /* #### should be reusing the arglist, not always consing anew.
|
|
|
2854 Repeated handler invocations should not cause repeated consing.
|
|
|
2855 Doesn't matter for now, because this is just a quick implementation
|
|
|
2856 for obsolescence support. */
|
|
|
2857 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym,
|
|
|
2858 bfwd->harg[htype], Qnil);
|
|
|
2859 }
|
|
|
2860
|
|
280
|
2861 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler,
|
|
|
2862 3, 5, 0, /*
|
|
0
|
2863 Don't you dare use this.
|
|
|
2864 If you do, suffer the wrath of Ben, who is likely to rename
|
|
|
2865 this function (or change the semantics of its arguments) without
|
|
|
2866 pity, thereby invalidating your code.
|
|
20
|
2867 */
|
|
|
2868 (variable, handler_type, handler, harg, keep_existing))
|
|
0
|
2869 {
|
|
|
2870 Lisp_Object valcontents;
|
|
|
2871 struct symbol_value_lisp_magic *bfwd;
|
|
|
2872 enum lisp_magic_handler htype;
|
|
|
2873 int i;
|
|
|
2874
|
|
|
2875 /* #### WARNING, only some handler types are implemented. See above.
|
|
|
2876 Actions of other types will ignore a handler if it's there.
|
|
|
2877
|
|
|
2878 #### Also, `chain-to-symbol-value-handler' and
|
|
|
2879 `symbol-function-corresponding-function' are not implemented. */
|
|
|
2880 CHECK_SYMBOL (variable);
|
|
|
2881 CHECK_SYMBOL (handler_type);
|
|
|
2882 htype = decode_magic_handler_type (handler_type);
|
|
|
2883 valcontents = XSYMBOL (variable)->value;
|
|
|
2884 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2885 {
|
|
185
|
2886 bfwd = alloc_lcrecord_type (struct symbol_value_lisp_magic,
|
|
398
|
2887 &lrecord_symbol_value_lisp_magic);
|
|
0
|
2888 bfwd->magic.type = SYMVAL_LISP_MAGIC;
|
|
|
2889 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2890 {
|
|
|
2891 bfwd->handler[i] = Qnil;
|
|
|
2892 bfwd->harg[i] = Qnil;
|
|
|
2893 }
|
|
|
2894 bfwd->shadowed = valcontents;
|
|
|
2895 XSETSYMBOL_VALUE_MAGIC (XSYMBOL (variable)->value, bfwd);
|
|
|
2896 }
|
|
|
2897 else
|
|
|
2898 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents);
|
|
|
2899 bfwd->handler[htype] = handler;
|
|
|
2900 bfwd->harg[htype] = harg;
|
|
|
2901
|
|
|
2902 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2903 if (!NILP (bfwd->handler[i]))
|
|
|
2904 break;
|
|
|
2905
|
|
|
2906 if (i == MAGIC_HANDLER_MAX)
|
|
|
2907 /* there are no remaining handlers, so remove the structure. */
|
|
|
2908 XSYMBOL (variable)->value = bfwd->shadowed;
|
|
|
2909
|
|
|
2910 return Qnil;
|
|
|
2911 }
|
|
|
2912
|
|
|
2913
|
|
|
2914 /* functions for working with variable aliases. */
|
|
|
2915
|
|
380
|
2916 /* Follow the chain of variable aliases for SYMBOL. Return the
|
|
0
|
2917 resulting symbol, whose value cell is guaranteed not to be a
|
|
|
2918 symbol-value-varalias.
|
|
|
2919
|
|
|
2920 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias.
|
|
|
2921 If FUNSYM is t, always follow in such a case. If FUNSYM is nil,
|
|
|
2922 never follow; stop right there. Otherwise FUNSYM should be a
|
|
|
2923 recognized symbol-value function symbol; this means, follow
|
|
|
2924 unless there is a special handler for the named function.
|
|
|
2925
|
|
|
2926 OK, there is at least one reason why it's necessary for
|
|
|
2927 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we
|
|
|
2928 can always be sure to catch cyclic variable aliasing. If we never
|
|
|
2929 follow past Lisp magic, then if the following is done:
|
|
|
2930
|
|
|
2931 (defvaralias 'a 'b)
|
|
|
2932 add some magic behavior to a, but not a "get-value" handler
|
|
|
2933 (defvaralias 'b 'a)
|
|
|
2934
|
|
|
2935 then an attempt to retrieve a's or b's value would cause infinite
|
|
|
2936 looping in `symbol-value'.
|
|
|
2937
|
|
|
2938 We (of course) can't always follow past Lisp magic, because then
|
|
|
2939 we make any variable that is lisp-magic -> varalias behave as if
|
|
|
2940 the lisp-magic is not present at all.
|
|
|
2941 */
|
|
|
2942
|
|
|
2943 static Lisp_Object
|
|
380
|
2944 follow_varalias_pointers (Lisp_Object symbol,
|
|
0
|
2945 Lisp_Object follow_past_lisp_magic)
|
|
|
2946 {
|
|
380
|
2947 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16
|
|
|
2948 Lisp_Object tortoise, hare, val;
|
|
|
2949 int count;
|
|
0
|
2950
|
|
|
2951 /* quick out just in case */
|
|
380
|
2952 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value))
|
|
|
2953 return symbol;
|
|
|
2954
|
|
|
2955 /* Compare implementation of indirect_function(). */
|
|
|
2956 for (hare = tortoise = symbol, count = 0;
|
|
|
2957 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic),
|
|
|
2958 SYMBOL_VALUE_VARALIAS_P (val);
|
|
|
2959 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)),
|
|
|
2960 count++)
|
|
0
|
2961 {
|
|
380
|
2962 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue;
|
|
|
2963
|
|
|
2964 if (count & 1)
|
|
|
2965 tortoise = symbol_value_varalias_aliasee
|
|
|
2966 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic
|
|
|
2967 (tortoise, follow_past_lisp_magic)));
|
|
0
|
2968 if (EQ (hare, tortoise))
|
|
380
|
2969 return Fsignal (Qcyclic_variable_indirection, list1 (symbol));
|
|
0
|
2970 }
|
|
|
2971
|
|
|
2972 return hare;
|
|
|
2973 }
|
|
|
2974
|
|
20
|
2975 DEFUN ("defvaralias", Fdefvaralias, 2, 2, 0, /*
|
|
0
|
2976 Define a variable as an alias for another variable.
|
|
|
2977 Thenceforth, any operations performed on VARIABLE will actually be
|
|
|
2978 performed on ALIAS. Both VARIABLE and ALIAS should be symbols.
|
|
|
2979 If ALIAS is nil, remove any aliases for VARIABLE.
|
|
|
2980 ALIAS can itself be aliased, and the chain of variable aliases
|
|
|
2981 will be followed appropriately.
|
|
|
2982 If VARIABLE already has a value, this value will be shadowed
|
|
|
2983 until the alias is removed, at which point it will be restored.
|
|
|
2984 Currently VARIABLE cannot be a built-in variable, a variable that
|
|
|
2985 has a buffer-local value in any buffer, or the symbols nil or t.
|
|
272
|
2986 \(ALIAS, however, can be any type of variable.)
|
|
20
|
2987 */
|
|
|
2988 (variable, alias))
|
|
0
|
2989 {
|
|
|
2990 struct symbol_value_varalias *bfwd;
|
|
|
2991 Lisp_Object valcontents;
|
|
|
2992
|
|
|
2993 CHECK_SYMBOL (variable);
|
|
|
2994 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
2995
|
|
|
2996 valcontents = XSYMBOL (variable)->value;
|
|
|
2997
|
|
|
2998 if (NILP (alias))
|
|
|
2999 {
|
|
|
3000 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3001 {
|
|
|
3002 XSYMBOL (variable)->value =
|
|
|
3003 symbol_value_varalias_shadowed
|
|
|
3004 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3005 }
|
|
|
3006 return Qnil;
|
|
|
3007 }
|
|
173
|
3008
|
|
0
|
3009 CHECK_SYMBOL (alias);
|
|
|
3010 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3011 {
|
|
|
3012 /* transmogrify */
|
|
|
3013 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = alias;
|
|
|
3014 return Qnil;
|
|
|
3015 }
|
|
|
3016
|
|
|
3017 if (SYMBOL_VALUE_MAGIC_P (valcontents)
|
|
|
3018 && !UNBOUNDP (valcontents))
|
|
|
3019 signal_simple_error ("Variable is magic and cannot be aliased", variable);
|
|
|
3020 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
3021
|
|
185
|
3022 bfwd = alloc_lcrecord_type (struct symbol_value_varalias,
|
|
398
|
3023 &lrecord_symbol_value_varalias);
|
|
0
|
3024 bfwd->magic.type = SYMVAL_VARALIAS;
|
|
|
3025 bfwd->aliasee = alias;
|
|
|
3026 bfwd->shadowed = valcontents;
|
|
173
|
3027
|
|
0
|
3028 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
3029 XSYMBOL (variable)->value = valcontents;
|
|
|
3030 return Qnil;
|
|
|
3031 }
|
|
|
3032
|
|
20
|
3033 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /*
|
|
0
|
3034 If VARIABLE is aliased to another variable, return that variable.
|
|
|
3035 VARIABLE should be a symbol. If VARIABLE is not aliased, return nil.
|
|
|
3036 Variable aliases are created with `defvaralias'. See also
|
|
|
3037 `indirect-variable'.
|
|
20
|
3038 */
|
|
|
3039 (variable, follow_past_lisp_magic))
|
|
0
|
3040 {
|
|
|
3041 Lisp_Object valcontents;
|
|
|
3042
|
|
|
3043 CHECK_SYMBOL (variable);
|
|
|
3044 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3045 {
|
|
|
3046 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
183
|
3047 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
0
|
3048 }
|
|
|
3049
|
|
|
3050 valcontents = fetch_value_maybe_past_magic (variable,
|
|
|
3051 follow_past_lisp_magic);
|
|
|
3052
|
|
|
3053 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3054 return symbol_value_varalias_aliasee
|
|
|
3055 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3056 else
|
|
|
3057 return Qnil;
|
|
|
3058 }
|
|
|
3059
|
|
20
|
3060 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /*
|
|
0
|
3061 Return the variable at the end of OBJECT's variable-alias chain.
|
|
|
3062 If OBJECT is a symbol, follow all variable aliases and return
|
|
|
3063 the final (non-aliased) symbol. Variable aliases are created with
|
|
|
3064 the function `defvaralias'.
|
|
|
3065 If OBJECT is not a symbol, just return it.
|
|
|
3066 Signal a cyclic-variable-indirection error if there is a loop in the
|
|
|
3067 variable chain of symbols.
|
|
20
|
3068 */
|
|
|
3069 (object, follow_past_lisp_magic))
|
|
0
|
3070 {
|
|
|
3071 if (!SYMBOLP (object))
|
|
|
3072 return object;
|
|
|
3073 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3074 {
|
|
|
3075 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
183
|
3076 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
0
|
3077 }
|
|
|
3078 return follow_varalias_pointers (object, follow_past_lisp_magic);
|
|
|
3079 }
|
|
|
3080
|
|
|
3081
|
|
|
3082 /************************************************************************/
|
|
|
3083 /* initialization */
|
|
|
3084 /************************************************************************/
|
|
|
3085
|
|
|
3086 /* A dumped XEmacs image has a lot more than 1511 symbols. Last
|
|
|
3087 estimate was that there were actually around 6300. So let's try
|
|
|
3088 making this bigger and see if we get better hashing behavior. */
|
|
|
3089 #define OBARRAY_SIZE 16411
|
|
|
3090
|
|
|
3091 #ifndef Qzero
|
|
|
3092 Lisp_Object Qzero;
|
|
|
3093 #endif
|
|
207
|
3094 #ifndef Qnull_pointer
|
|
|
3095 Lisp_Object Qnull_pointer;
|
|
|
3096 #endif
|
|
0
|
3097
|
|
|
3098 /* some losing systems can't have static vars at function scope... */
|
|
412
|
3099 static struct symbol_value_magic guts_of_unbound_marker =
|
|
|
3100 { { symbol_value_forward_lheader_initializer, 0, 69},
|
|
|
3101 SYMVAL_UNBOUND_MARKER };
|
|
247
|
3102
|
|
0
|
3103 void
|
|
|
3104 init_symbols_once_early (void)
|
|
|
3105 {
|
|
412
|
3106 #ifndef Qzero
|
|
|
3107 Qzero = make_int (0); /* Only used if Lisp_Object is a union type */
|
|
|
3108 #endif
|
|
|
3109
|
|
|
3110 #ifndef Qnull_pointer
|
|
|
3111 /* C guarantees that Qnull_pointer will be initialized to all 0 bits,
|
|
|
3112 so the following is actually a no-op. */
|
|
|
3113 XSETOBJ (Qnull_pointer, (enum Lisp_Type) 0, 0);
|
|
|
3114 #endif
|
|
398
|
3115
|
|
|
3116 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is
|
|
0
|
3117 called the first time. */
|
|
412
|
3118 Qnil = Fmake_symbol (make_string_nocopy ((CONST Bufbyte *) "nil", 3));
|
|
0
|
3119 XSYMBOL (Qnil)->name->plist = Qnil;
|
|
|
3120 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihil */
|
|
|
3121 XSYMBOL (Qnil)->plist = Qnil;
|
|
173
|
3122
|
|
0
|
3123 Vobarray = make_vector (OBARRAY_SIZE, Qzero);
|
|
|
3124 initial_obarray = Vobarray;
|
|
|
3125 staticpro (&initial_obarray);
|
|
|
3126 /* Intern nil in the obarray */
|
|
|
3127 {
|
|
272
|
3128 int hash = hash_string (string_data (XSYMBOL (Qnil)->name), 3);
|
|
|
3129 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil;
|
|
0
|
3130 }
|
|
173
|
3131
|
|
0
|
3132 {
|
|
|
3133 /* Required to get around a GCC syntax error on certain
|
|
|
3134 architectures */
|
|
412
|
3135 struct symbol_value_magic *tem = &guts_of_unbound_marker;
|
|
173
|
3136
|
|
0
|
3137 XSETSYMBOL_VALUE_MAGIC (Qunbound, tem);
|
|
|
3138 }
|
|
412
|
3139 if ((CONST void *) XPNTR (Qunbound) !=
|
|
|
3140 (CONST void *)&guts_of_unbound_marker)
|
|
|
3141 {
|
|
|
3142 /* This might happen on DATA_SEG_BITS machines. */
|
|
|
3143 /* abort (); */
|
|
|
3144 /* Can't represent a pointer to constant C data using a Lisp_Object.
|
|
|
3145 So heap-allocate it. */
|
|
|
3146 struct symbol_value_magic *urk = xnew (struct symbol_value_magic);
|
|
|
3147 memcpy (urk, &guts_of_unbound_marker, sizeof (*urk));
|
|
|
3148 XSETSYMBOL_VALUE_MAGIC (Qunbound, urk);
|
|
|
3149 }
|
|
173
|
3150
|
|
0
|
3151 XSYMBOL (Qnil)->function = Qunbound;
|
|
173
|
3152
|
|
0
|
3153 defsymbol (&Qt, "t");
|
|
|
3154 XSYMBOL (Qt)->value = Qt; /* Veritas aetera */
|
|
|
3155 Vquit_flag = Qnil;
|
|
|
3156 }
|
|
|
3157
|
|
|
3158 void
|
|
412
|
3159 defsymbol (Lisp_Object *location, CONST char *name)
|
|
0
|
3160 {
|
|
412
|
3161 *location = Fintern (make_string_nocopy ((CONST Bufbyte *) name,
|
|
398
|
3162 strlen (name)),
|
|
0
|
3163 Qnil);
|
|
|
3164 staticpro (location);
|
|
|
3165 }
|
|
|
3166
|
|
|
3167 void
|
|
412
|
3168 defkeyword (Lisp_Object *location, CONST char *name)
|
|
0
|
3169 {
|
|
|
3170 defsymbol (location, name);
|
|
|
3171 Fset (*location, *location);
|
|
|
3172 }
|
|
|
3173
|
|
380
|
3174 #ifdef DEBUG_XEMACS
|
|
|
3175 /* Check that nobody spazzed writing a DEFUN. */
|
|
|
3176 static void
|
|
|
3177 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym)
|
|
0
|
3178 {
|
|
16
|
3179 assert (subr->min_args >= 0);
|
|
|
3180 assert (subr->min_args <= SUBR_MAX_ARGS);
|
|
|
3181
|
|
380
|
3182 if (subr->max_args != MANY &&
|
|
|
3183 subr->max_args != UNEVALLED)
|
|
0
|
3184 {
|
|
16
|
3185 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */
|
|
|
3186 assert (subr->max_args <= SUBR_MAX_ARGS);
|
|
|
3187 assert (subr->min_args <= subr->max_args);
|
|
0
|
3188 }
|
|
173
|
3189
|
|
16
|
3190 assert (UNBOUNDP (XSYMBOL (sym)->function));
|
|
380
|
3191 }
|
|
|
3192 #else
|
|
|
3193 #define check_sane_subr(subr, sym) /* nothing */
|
|
|
3194 #endif
|
|
|
3195
|
|
388
|
3196 #ifdef HAVE_SHLIB
|
|
|
3197 /*
|
|
|
3198 * If we are not in a pure undumped Emacs, we need to make a duplicate of
|
|
|
3199 * the subr. This is because the only time this function will be called
|
|
|
3200 * in a running Emacs is when a dynamically loaded module is adding a
|
|
|
3201 * subr, and we need to make sure that the subr is in allocated, Lisp-
|
|
|
3202 * accessible memory. The address assigned to the static subr struct
|
|
|
3203 * in the shared object will be a trampoline address, so we need to create
|
|
|
3204 * a copy here to ensure that a real address is used.
|
|
|
3205 *
|
|
|
3206 * Once we have copied everything across, we re-use the original static
|
|
|
3207 * structure to store a pointer to the newly allocated one. This will be
|
|
|
3208 * used in emodules.c by emodules_doc_subr() to find a pointer to the
|
|
|
3209 * allocated object so that we can set its doc string propperly.
|
|
|
3210 *
|
|
|
3211 * NOTE: We dont actually use the DOC pointer here any more, but we did
|
|
|
3212 * in an earlier implementation of module support. There is no harm in
|
|
|
3213 * setting it here in case we ever need it in future implementations.
|
|
|
3214 * subr->doc will point to the new subr structure that was allocated.
|
|
|
3215 * Code can then get this value from the statis subr structure and use
|
|
|
3216 * it if required.
|
|
|
3217 *
|
|
|
3218 * FIXME: Should newsubr be staticpro()'ed? I dont think so but I need
|
|
|
3219 * a guru to check.
|
|
|
3220 */
|
|
412
|
3221 #define check_module_subr() \
|
|
|
3222 do { \
|
|
|
3223 if (initialized) { \
|
|
|
3224 struct Lisp_Subr *newsubr; \
|
|
|
3225 newsubr = (Lisp_Subr *)xmalloc(sizeof(struct Lisp_Subr)); \
|
|
|
3226 memcpy (newsubr, subr, sizeof(struct Lisp_Subr)); \
|
|
|
3227 subr->doc = (CONST char *)newsubr; \
|
|
|
3228 subr = newsubr; \
|
|
|
3229 } \
|
|
388
|
3230 } while (0)
|
|
|
3231 #else /* ! HAVE_SHLIB */
|
|
|
3232 #define check_module_subr()
|
|
|
3233 #endif
|
|
|
3234
|
|
380
|
3235 void
|
|
|
3236 defsubr (Lisp_Subr *subr)
|
|
|
3237 {
|
|
|
3238 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3239 Lisp_Object fun;
|
|
|
3240
|
|
|
3241 check_sane_subr (subr, sym);
|
|
388
|
3242 check_module_subr ();
|
|
380
|
3243
|
|
|
3244 XSETSUBR (fun, subr);
|
|
|
3245 XSYMBOL (sym)->function = fun;
|
|
|
3246 }
|
|
|
3247
|
|
|
3248 /* Define a lisp macro using a Lisp_Subr. */
|
|
|
3249 void
|
|
|
3250 defsubr_macro (Lisp_Subr *subr)
|
|
|
3251 {
|
|
|
3252 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3253 Lisp_Object fun;
|
|
|
3254
|
|
|
3255 check_sane_subr (subr, sym);
|
|
388
|
3256 check_module_subr();
|
|
380
|
3257
|
|
|
3258 XSETSUBR (fun, subr);
|
|
|
3259 XSYMBOL (sym)->function = Fcons (Qmacro, fun);
|
|
0
|
3260 }
|
|
|
3261
|
|
|
3262 void
|
|
412
|
3263 deferror (Lisp_Object *symbol, CONST char *name, CONST char *messuhhj,
|
|
0
|
3264 Lisp_Object inherits_from)
|
|
|
3265 {
|
|
|
3266 Lisp_Object conds;
|
|
|
3267 defsymbol (symbol, name);
|
|
|
3268
|
|
|
3269 assert (SYMBOLP (inherits_from));
|
|
|
3270 conds = Fget (inherits_from, Qerror_conditions, Qnil);
|
|
412
|
3271 pure_put (*symbol, Qerror_conditions, Fcons (*symbol, conds));
|
|
0
|
3272 /* NOT build_translated_string (). This function is called at load time
|
|
|
3273 and the string needs to get translated at run time. (This happens
|
|
|
3274 in the function (display-error) in cmdloop.el.) */
|
|
412
|
3275 pure_put (*symbol, Qerror_message, build_string (messuhhj));
|
|
0
|
3276 }
|
|
|
3277
|
|
|
3278 void
|
|
|
3279 syms_of_symbols (void)
|
|
|
3280 {
|
|
|
3281 defsymbol (&Qvariable_documentation, "variable-documentation");
|
|
|
3282 defsymbol (&Qvariable_domain, "variable-domain"); /* I18N3 */
|
|
|
3283 defsymbol (&Qad_advice_info, "ad-advice-info");
|
|
|
3284 defsymbol (&Qad_activate, "ad-activate");
|
|
|
3285
|
|
|
3286 defsymbol (&Qget_value, "get-value");
|
|
|
3287 defsymbol (&Qset_value, "set-value");
|
|
|
3288 defsymbol (&Qbound_predicate, "bound-predicate");
|
|
|
3289 defsymbol (&Qmake_unbound, "make-unbound");
|
|
|
3290 defsymbol (&Qlocal_predicate, "local-predicate");
|
|
|
3291 defsymbol (&Qmake_local, "make-local");
|
|
|
3292
|
|
|
3293 defsymbol (&Qboundp, "boundp");
|
|
412
|
3294 defsymbol (&Qfboundp, "fboundp");
|
|
0
|
3295 defsymbol (&Qglobally_boundp, "globally-boundp");
|
|
|
3296 defsymbol (&Qmakunbound, "makunbound");
|
|
|
3297 defsymbol (&Qsymbol_value, "symbol-value");
|
|
|
3298 defsymbol (&Qset, "set");
|
|
380
|
3299 defsymbol (&Qsetq_default, "setq-default");
|
|
0
|
3300 defsymbol (&Qdefault_boundp, "default-boundp");
|
|
|
3301 defsymbol (&Qdefault_value, "default-value");
|
|
|
3302 defsymbol (&Qset_default, "set-default");
|
|
|
3303 defsymbol (&Qmake_variable_buffer_local, "make-variable-buffer-local");
|
|
|
3304 defsymbol (&Qmake_local_variable, "make-local-variable");
|
|
|
3305 defsymbol (&Qkill_local_variable, "kill-local-variable");
|
|
|
3306 defsymbol (&Qkill_console_local_variable, "kill-console-local-variable");
|
|
|
3307 defsymbol (&Qsymbol_value_in_buffer, "symbol-value-in-buffer");
|
|
|
3308 defsymbol (&Qsymbol_value_in_console, "symbol-value-in-console");
|
|
|
3309 defsymbol (&Qlocal_variable_p, "local-variable-p");
|
|
|
3310
|
|
|
3311 defsymbol (&Qconst_integer, "const-integer");
|
|
|
3312 defsymbol (&Qconst_boolean, "const-boolean");
|
|
|
3313 defsymbol (&Qconst_object, "const-object");
|
|
|
3314 defsymbol (&Qconst_specifier, "const-specifier");
|
|
|
3315 defsymbol (&Qdefault_buffer, "default-buffer");
|
|
|
3316 defsymbol (&Qcurrent_buffer, "current-buffer");
|
|
|
3317 defsymbol (&Qconst_current_buffer, "const-current-buffer");
|
|
|
3318 defsymbol (&Qdefault_console, "default-console");
|
|
|
3319 defsymbol (&Qselected_console, "selected-console");
|
|
|
3320 defsymbol (&Qconst_selected_console, "const-selected-console");
|
|
|
3321
|
|
20
|
3322 DEFSUBR (Fintern);
|
|
|
3323 DEFSUBR (Fintern_soft);
|
|
|
3324 DEFSUBR (Funintern);
|
|
|
3325 DEFSUBR (Fmapatoms);
|
|
|
3326 DEFSUBR (Fapropos_internal);
|
|
|
3327
|
|
|
3328 DEFSUBR (Fsymbol_function);
|
|
|
3329 DEFSUBR (Fsymbol_plist);
|
|
|
3330 DEFSUBR (Fsymbol_name);
|
|
|
3331 DEFSUBR (Fmakunbound);
|
|
|
3332 DEFSUBR (Ffmakunbound);
|
|
|
3333 DEFSUBR (Fboundp);
|
|
|
3334 DEFSUBR (Fglobally_boundp);
|
|
|
3335 DEFSUBR (Ffboundp);
|
|
|
3336 DEFSUBR (Ffset);
|
|
|
3337 DEFSUBR (Fdefine_function);
|
|
380
|
3338 Ffset (intern ("defalias"), intern ("define-function"));
|
|
20
|
3339 DEFSUBR (Fsetplist);
|
|
|
3340 DEFSUBR (Fsymbol_value_in_buffer);
|
|
|
3341 DEFSUBR (Fsymbol_value_in_console);
|
|
|
3342 DEFSUBR (Fbuilt_in_variable_type);
|
|
|
3343 DEFSUBR (Fsymbol_value);
|
|
|
3344 DEFSUBR (Fset);
|
|
|
3345 DEFSUBR (Fdefault_boundp);
|
|
|
3346 DEFSUBR (Fdefault_value);
|
|
|
3347 DEFSUBR (Fset_default);
|
|
|
3348 DEFSUBR (Fsetq_default);
|
|
|
3349 DEFSUBR (Fmake_variable_buffer_local);
|
|
|
3350 DEFSUBR (Fmake_local_variable);
|
|
|
3351 DEFSUBR (Fkill_local_variable);
|
|
|
3352 DEFSUBR (Fkill_console_local_variable);
|
|
|
3353 DEFSUBR (Flocal_variable_p);
|
|
|
3354 DEFSUBR (Fdefvaralias);
|
|
|
3355 DEFSUBR (Fvariable_alias);
|
|
|
3356 DEFSUBR (Findirect_variable);
|
|
|
3357 DEFSUBR (Fdontusethis_set_symbol_value_handler);
|
|
0
|
3358 }
|
|
|
3359
|
|
380
|
3360 /* Create and initialize a Lisp variable whose value is forwarded to C data */
|
|
0
|
3361 void
|
|
412
|
3362 defvar_magic (CONST char *symbol_name, CONST struct symbol_value_forward *magic)
|
|
0
|
3363 {
|
|
412
|
3364 Lisp_Object sym, kludge;
|
|
|
3365
|
|
|
3366 /* Check that `magic' points somewhere we can represent as a Lisp pointer */
|
|
|
3367 XSETOBJ (kludge, Lisp_Type_Record, magic);
|
|
|
3368 if ((void *)magic != (void*) XPNTR (kludge))
|
|
|
3369 {
|
|
|
3370 /* This might happen on DATA_SEG_BITS machines. */
|
|
|
3371 /* abort (); */
|
|
|
3372 /* Copy it to somewhere which is representable. */
|
|
|
3373 struct symbol_value_forward *p = xnew (struct symbol_value_forward);
|
|
|
3374 memcpy (p, magic, sizeof *magic);
|
|
|
3375 magic = p;
|
|
|
3376 }
|
|
380
|
3377
|
|
388
|
3378 #if defined(HAVE_SHLIB)
|
|
|
3379 /*
|
|
|
3380 * As with defsubr(), this will only be called in a dumped Emacs when
|
|
|
3381 * we are adding variables from a dynamically loaded module. That means
|
|
|
3382 * we can't use purespace. Take that into account.
|
|
|
3383 */
|
|
|
3384 if (initialized)
|
|
|
3385 sym = Fintern (build_string (symbol_name), Qnil);
|
|
|
3386 else
|
|
|
3387 #endif
|
|
412
|
3388 sym = Fintern (make_string_nocopy ((CONST Bufbyte *) symbol_name,
|
|
398
|
3389 strlen (symbol_name)), Qnil);
|
|
388
|
3390
|
|
380
|
3391 XSETOBJ (XSYMBOL (sym)->value, Lisp_Type_Record, magic);
|
|
0
|
3392 }
|
|
|
3393
|
|
|
3394 void
|
|
|
3395 vars_of_symbols (void)
|
|
|
3396 {
|
|
|
3397 DEFVAR_LISP ("obarray", &Vobarray /*
|
|
|
3398 Symbol table for use by `intern' and `read'.
|
|
|
3399 It is a vector whose length ought to be prime for best results.
|
|
|
3400 The vector's contents don't make sense if examined from Lisp programs;
|
|
|
3401 to find all the symbols in an obarray, use `mapatoms'.
|
|
|
3402 */ );
|
|
|
3403 /* obarray has been initialized long before */
|
|
|
3404 }
|
