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428
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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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793
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3 Copyright (C) 1995, 2000, 2001, 2002 Ben Wing.
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428
|
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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|
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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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872
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58 #include "console-impl.h"
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428
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59 #include "elhash.h"
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60
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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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66 Lisp_Object Qboundp, Qglobally_boundp, Qmakunbound;
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67 Lisp_Object Qsymbol_value, Qset, Qdefault_boundp, Qdefault_value;
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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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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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83 Lisp_Object follow_past_lisp_magic);
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84 static Lisp_Object *value_slot_past_magic (Lisp_Object sym);
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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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87
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88
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89 static Lisp_Object
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90 mark_symbol (Lisp_Object obj)
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91 {
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440
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92 Lisp_Symbol *sym = XSYMBOL (obj);
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428
|
93
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|
94 mark_object (sym->value);
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|
95 mark_object (sym->function);
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793
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96 mark_object (sym->name);
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428
|
97 if (!symbol_next (sym))
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98 return sym->plist;
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99 else
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100 {
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|
101 mark_object (sym->plist);
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102 /* Mark the rest of the symbols in the obarray hash-chain */
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103 sym = symbol_next (sym);
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793
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104 return wrap_symbol (sym);
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428
|
105 }
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106 }
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107
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108 static const struct lrecord_description symbol_description[] = {
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440
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109 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, next) },
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110 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, name) },
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111 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, value) },
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112 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, function) },
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113 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, plist) },
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428
|
114 { XD_END }
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115 };
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116
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442
|
117 /* Symbol plists are directly accessible, so we need to protect against
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118 invalid property list structure */
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119
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120 static Lisp_Object
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121 symbol_getprop (Lisp_Object symbol, Lisp_Object property)
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122 {
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123 return external_plist_get (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME);
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124 }
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125
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126 static int
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127 symbol_putprop (Lisp_Object symbol, Lisp_Object property, Lisp_Object value)
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128 {
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129 external_plist_put (&XSYMBOL (symbol)->plist, property, value, 0, ERROR_ME);
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130 return 1;
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131 }
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132
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133 static int
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134 symbol_remprop (Lisp_Object symbol, Lisp_Object property)
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135 {
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136 return external_remprop (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME);
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137 }
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138
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|
|
139 DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS ("symbol", symbol,
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140 mark_symbol, print_symbol,
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141 0, 0, 0, symbol_description,
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142 symbol_getprop,
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143 symbol_putprop,
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|
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144 symbol_remprop,
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|
145 Fsymbol_plist,
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|
|
146 Lisp_Symbol);
|
|
428
|
147
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|
|
148
|
|
|
149 /**********************************************************************/
|
|
|
150 /* Intern */
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|
|
151 /**********************************************************************/
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152
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|
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153 /* #### using a vector here is way bogus. Use a hash table instead. */
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154
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155 Lisp_Object Vobarray;
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156
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|
|
157 static Lisp_Object initial_obarray;
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158
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|
|
159 /* oblookup stores the bucket number here, for the sake of Funintern. */
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160
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|
|
161 static int oblookup_last_bucket_number;
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162
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|
|
163 static Lisp_Object
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164 check_obarray (Lisp_Object obarray)
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165 {
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|
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166 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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|
167 {
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|
|
168 /* If Vobarray is now invalid, force it to be valid. */
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|
169 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
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170
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171 obarray = wrong_type_argument (Qvectorp, obarray);
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172 }
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173 return obarray;
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174 }
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175
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|
|
176 Lisp_Object
|
|
867
|
177 intern_int (const Ibyte *str)
|
|
428
|
178 {
|
|
771
|
179 Bytecount len = qxestrlen (str);
|
|
428
|
180 Lisp_Object obarray = Vobarray;
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181
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|
|
182 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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|
183 obarray = check_obarray (obarray);
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|
184
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|
|
185 {
|
|
771
|
186 Lisp_Object tem = oblookup (obarray, str, len);
|
|
428
|
187 if (SYMBOLP (tem))
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|
188 return tem;
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|
189 }
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|
190
|
|
771
|
191 return Fintern (make_string (str, len), obarray);
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|
192 }
|
|
|
193
|
|
|
194 Lisp_Object
|
|
867
|
195 intern (const CIbyte *str)
|
|
771
|
196 {
|
|
867
|
197 return intern_int ((Ibyte *) str);
|
|
428
|
198 }
|
|
|
199
|
|
814
|
200 Lisp_Object
|
|
867
|
201 intern_converting_underscores_to_dashes (const CIbyte *str)
|
|
814
|
202 {
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|
|
203 Bytecount len = strlen (str);
|
|
867
|
204 CIbyte *tmp = alloca_extbytes (len + 1);
|
|
814
|
205 Bytecount i;
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|
|
206 strcpy (tmp, str);
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|
|
207 for (i = 0; i < len; i++)
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|
|
208 if (tmp[i] == '_')
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|
|
209 tmp[i] = '-';
|
|
867
|
210 return intern_int ((Ibyte *) tmp);
|
|
814
|
211 }
|
|
|
212
|
|
428
|
213 DEFUN ("intern", Fintern, 1, 2, 0, /*
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|
|
214 Return the canonical symbol whose name is STRING.
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|
|
215 If there is none, one is created by this function and returned.
|
|
444
|
216 Optional second argument OBARRAY specifies the obarray to use;
|
|
|
217 it defaults to the value of the variable `obarray'.
|
|
428
|
218 */
|
|
|
219 (string, obarray))
|
|
|
220 {
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|
|
221 Lisp_Object object, *ptr;
|
|
793
|
222 Lisp_Object symbol;
|
|
428
|
223 Bytecount len;
|
|
|
224
|
|
|
225 if (NILP (obarray)) obarray = Vobarray;
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|
|
226 obarray = check_obarray (obarray);
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|
|
227
|
|
|
228 CHECK_STRING (string);
|
|
|
229
|
|
|
230 len = XSTRING_LENGTH (string);
|
|
|
231 object = oblookup (obarray, XSTRING_DATA (string), len);
|
|
|
232 if (!INTP (object))
|
|
|
233 /* Found it */
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|
|
234 return object;
|
|
|
235
|
|
|
236 ptr = &XVECTOR_DATA (obarray)[XINT (object)];
|
|
|
237
|
|
|
238 object = Fmake_symbol (string);
|
|
793
|
239 symbol = object;
|
|
428
|
240
|
|
|
241 if (SYMBOLP (*ptr))
|
|
793
|
242 XSYMBOL_NEXT (symbol) = XSYMBOL (*ptr);
|
|
428
|
243 else
|
|
793
|
244 XSYMBOL_NEXT (symbol) = 0;
|
|
428
|
245 *ptr = object;
|
|
|
246
|
|
826
|
247 if (string_byte (XSYMBOL_NAME (symbol), 0) == ':' && EQ (obarray, Vobarray))
|
|
428
|
248 {
|
|
|
249 /* The LISP way is to put keywords in their own package, but we
|
|
|
250 don't have packages, so we do something simpler. Someday,
|
|
|
251 maybe we'll have packages and then this will be reworked.
|
|
|
252 --Stig. */
|
|
793
|
253 XSYMBOL_VALUE (symbol) = object;
|
|
428
|
254 }
|
|
|
255
|
|
|
256 return object;
|
|
|
257 }
|
|
|
258
|
|
|
259 DEFUN ("intern-soft", Fintern_soft, 1, 2, 0, /*
|
|
|
260 Return the canonical symbol named NAME, or nil if none exists.
|
|
|
261 NAME may be a string or a symbol. If it is a symbol, that exact
|
|
|
262 symbol is searched for.
|
|
444
|
263 Optional second argument OBARRAY specifies the obarray to use;
|
|
|
264 it defaults to the value of the variable `obarray'.
|
|
428
|
265 */
|
|
|
266 (name, obarray))
|
|
|
267 {
|
|
|
268 /* #### Bug! (intern-soft "nil") returns nil. Perhaps we should
|
|
|
269 add a DEFAULT-IF-NOT-FOUND arg, like in get. */
|
|
|
270 Lisp_Object tem;
|
|
793
|
271 Lisp_Object string;
|
|
428
|
272
|
|
|
273 if (NILP (obarray)) obarray = Vobarray;
|
|
|
274 obarray = check_obarray (obarray);
|
|
|
275
|
|
|
276 if (!SYMBOLP (name))
|
|
|
277 {
|
|
|
278 CHECK_STRING (name);
|
|
793
|
279 string = name;
|
|
428
|
280 }
|
|
|
281 else
|
|
|
282 string = symbol_name (XSYMBOL (name));
|
|
|
283
|
|
793
|
284 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string));
|
|
428
|
285 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem)))
|
|
|
286 return Qnil;
|
|
|
287 else
|
|
|
288 return tem;
|
|
|
289 }
|
|
|
290
|
|
|
291 DEFUN ("unintern", Funintern, 1, 2, 0, /*
|
|
|
292 Delete the symbol named NAME, if any, from OBARRAY.
|
|
|
293 The value is t if a symbol was found and deleted, nil otherwise.
|
|
|
294 NAME may be a string or a symbol. If it is a symbol, that symbol
|
|
|
295 is deleted, if it belongs to OBARRAY--no other symbol is deleted.
|
|
444
|
296 OBARRAY defaults to the value of the variable `obarray'.
|
|
428
|
297 */
|
|
|
298 (name, obarray))
|
|
|
299 {
|
|
|
300 Lisp_Object tem;
|
|
793
|
301 Lisp_Object string;
|
|
428
|
302 int hash;
|
|
|
303
|
|
|
304 if (NILP (obarray)) obarray = Vobarray;
|
|
|
305 obarray = check_obarray (obarray);
|
|
|
306
|
|
|
307 if (SYMBOLP (name))
|
|
|
308 string = symbol_name (XSYMBOL (name));
|
|
|
309 else
|
|
|
310 {
|
|
|
311 CHECK_STRING (name);
|
|
793
|
312 string = name;
|
|
428
|
313 }
|
|
|
314
|
|
793
|
315 tem = oblookup (obarray, XSTRING_DATA (string), XSTRING_LENGTH (string));
|
|
428
|
316 if (INTP (tem))
|
|
|
317 return Qnil;
|
|
|
318 /* If arg was a symbol, don't delete anything but that symbol itself. */
|
|
|
319 if (SYMBOLP (name) && !EQ (name, tem))
|
|
|
320 return Qnil;
|
|
|
321
|
|
|
322 hash = oblookup_last_bucket_number;
|
|
|
323
|
|
|
324 if (EQ (XVECTOR_DATA (obarray)[hash], tem))
|
|
|
325 {
|
|
|
326 if (XSYMBOL (tem)->next)
|
|
793
|
327 XVECTOR_DATA (obarray)[hash] = wrap_symbol (XSYMBOL (tem)->next);
|
|
428
|
328 else
|
|
|
329 XVECTOR_DATA (obarray)[hash] = Qzero;
|
|
|
330 }
|
|
|
331 else
|
|
|
332 {
|
|
|
333 Lisp_Object tail, following;
|
|
|
334
|
|
|
335 for (tail = XVECTOR_DATA (obarray)[hash];
|
|
|
336 XSYMBOL (tail)->next;
|
|
|
337 tail = following)
|
|
|
338 {
|
|
793
|
339 following = wrap_symbol (XSYMBOL (tail)->next);
|
|
428
|
340 if (EQ (following, tem))
|
|
|
341 {
|
|
|
342 XSYMBOL (tail)->next = XSYMBOL (following)->next;
|
|
|
343 break;
|
|
|
344 }
|
|
|
345 }
|
|
|
346 }
|
|
|
347 return Qt;
|
|
|
348 }
|
|
|
349
|
|
|
350 /* Return the symbol in OBARRAY whose names matches the string
|
|
|
351 of SIZE characters at PTR. If there is no such symbol in OBARRAY,
|
|
|
352 return the index into OBARRAY that the string hashes to.
|
|
|
353
|
|
|
354 Also store the bucket number in oblookup_last_bucket_number. */
|
|
|
355
|
|
|
356 Lisp_Object
|
|
867
|
357 oblookup (Lisp_Object obarray, const Ibyte *ptr, Bytecount size)
|
|
428
|
358 {
|
|
490
|
359 unsigned int hash, obsize;
|
|
440
|
360 Lisp_Symbol *tail;
|
|
428
|
361 Lisp_Object bucket;
|
|
|
362
|
|
|
363 if (!VECTORP (obarray) ||
|
|
|
364 (obsize = XVECTOR_LENGTH (obarray)) == 0)
|
|
|
365 {
|
|
|
366 obarray = check_obarray (obarray);
|
|
|
367 obsize = XVECTOR_LENGTH (obarray);
|
|
|
368 }
|
|
|
369 hash = hash_string (ptr, size) % obsize;
|
|
|
370 oblookup_last_bucket_number = hash;
|
|
|
371 bucket = XVECTOR_DATA (obarray)[hash];
|
|
|
372 if (ZEROP (bucket))
|
|
|
373 ;
|
|
|
374 else if (!SYMBOLP (bucket))
|
|
563
|
375 signal_error (Qinvalid_state, "Bad data in guts of obarray", Qunbound); /* Like CADR error message */
|
|
428
|
376 else
|
|
|
377 for (tail = XSYMBOL (bucket); ;)
|
|
|
378 {
|
|
793
|
379 if (XSTRING_LENGTH (tail->name) == size &&
|
|
|
380 !memcmp (XSTRING_DATA (tail->name), ptr, size))
|
|
428
|
381 {
|
|
793
|
382 return wrap_symbol (tail);
|
|
428
|
383 }
|
|
|
384 tail = symbol_next (tail);
|
|
|
385 if (!tail)
|
|
|
386 break;
|
|
|
387 }
|
|
|
388 return make_int (hash);
|
|
|
389 }
|
|
|
390
|
|
490
|
391 /* An excellent string hashing function.
|
|
|
392 Adapted from glib's g_str_hash().
|
|
|
393 Investigation by Karl Nelson <kenelson@ece.ucdavis.edu>.
|
|
|
394 Do a web search for "g_str_hash X31_HASH" if you want to know more. */
|
|
|
395 unsigned int
|
|
867
|
396 hash_string (const Ibyte *ptr, Bytecount len)
|
|
428
|
397 {
|
|
490
|
398 unsigned int hash;
|
|
|
399
|
|
|
400 for (hash = 0; len; len--, ptr++)
|
|
|
401 /* (31 * hash) will probably be optimized to ((hash << 5) - hash). */
|
|
|
402 hash = 31 * hash + *ptr;
|
|
|
403
|
|
|
404 return hash;
|
|
428
|
405 }
|
|
|
406
|
|
|
407 /* Map FN over OBARRAY. The mapping is stopped when FN returns a
|
|
|
408 non-zero value. */
|
|
|
409 void
|
|
|
410 map_obarray (Lisp_Object obarray,
|
|
|
411 int (*fn) (Lisp_Object, void *), void *arg)
|
|
|
412 {
|
|
|
413 REGISTER int i;
|
|
|
414
|
|
|
415 CHECK_VECTOR (obarray);
|
|
|
416 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--)
|
|
|
417 {
|
|
|
418 Lisp_Object tail = XVECTOR_DATA (obarray)[i];
|
|
|
419 if (SYMBOLP (tail))
|
|
|
420 while (1)
|
|
|
421 {
|
|
440
|
422 Lisp_Symbol *next;
|
|
428
|
423 if ((*fn) (tail, arg))
|
|
|
424 return;
|
|
|
425 next = symbol_next (XSYMBOL (tail));
|
|
|
426 if (!next)
|
|
|
427 break;
|
|
793
|
428 tail = wrap_symbol (next);
|
|
428
|
429 }
|
|
|
430 }
|
|
|
431 }
|
|
|
432
|
|
|
433 static int
|
|
|
434 mapatoms_1 (Lisp_Object sym, void *arg)
|
|
|
435 {
|
|
|
436 call1 (*(Lisp_Object *)arg, sym);
|
|
|
437 return 0;
|
|
|
438 }
|
|
|
439
|
|
|
440 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /*
|
|
|
441 Call FUNCTION on every symbol in OBARRAY.
|
|
|
442 OBARRAY defaults to the value of `obarray'.
|
|
|
443 */
|
|
|
444 (function, obarray))
|
|
|
445 {
|
|
442
|
446 struct gcpro gcpro1;
|
|
|
447
|
|
428
|
448 if (NILP (obarray))
|
|
|
449 obarray = Vobarray;
|
|
|
450 obarray = check_obarray (obarray);
|
|
|
451
|
|
442
|
452 GCPRO1 (obarray);
|
|
428
|
453 map_obarray (obarray, mapatoms_1, &function);
|
|
442
|
454 UNGCPRO;
|
|
428
|
455 return Qnil;
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
|
459 /**********************************************************************/
|
|
|
460 /* Apropos */
|
|
|
461 /**********************************************************************/
|
|
|
462
|
|
|
463 struct appropos_mapper_closure
|
|
|
464 {
|
|
|
465 Lisp_Object regexp;
|
|
|
466 Lisp_Object predicate;
|
|
|
467 Lisp_Object accumulation;
|
|
|
468 };
|
|
|
469
|
|
|
470 static int
|
|
|
471 apropos_mapper (Lisp_Object symbol, void *arg)
|
|
|
472 {
|
|
|
473 struct appropos_mapper_closure *closure =
|
|
|
474 (struct appropos_mapper_closure *) arg;
|
|
|
475 Bytecount match = fast_lisp_string_match (closure->regexp,
|
|
|
476 Fsymbol_name (symbol));
|
|
|
477
|
|
|
478 if (match >= 0 &&
|
|
|
479 (NILP (closure->predicate) ||
|
|
|
480 !NILP (call1 (closure->predicate, symbol))))
|
|
|
481 closure->accumulation = Fcons (symbol, closure->accumulation);
|
|
|
482
|
|
|
483 return 0;
|
|
|
484 }
|
|
|
485
|
|
|
486 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /*
|
|
444
|
487 Return a list of all symbols whose names contain match for REGEXP.
|
|
|
488 If optional 2nd arg PREDICATE is non-nil, only symbols for which
|
|
|
489 \(funcall PREDICATE SYMBOL) returns non-nil are returned.
|
|
428
|
490 */
|
|
|
491 (regexp, predicate))
|
|
|
492 {
|
|
|
493 struct appropos_mapper_closure closure;
|
|
442
|
494 struct gcpro gcpro1;
|
|
428
|
495
|
|
|
496 CHECK_STRING (regexp);
|
|
|
497
|
|
|
498 closure.regexp = regexp;
|
|
|
499 closure.predicate = predicate;
|
|
|
500 closure.accumulation = Qnil;
|
|
442
|
501 GCPRO1 (closure.accumulation);
|
|
428
|
502 map_obarray (Vobarray, apropos_mapper, &closure);
|
|
|
503 closure.accumulation = Fsort (closure.accumulation, Qstring_lessp);
|
|
442
|
504 UNGCPRO;
|
|
428
|
505 return closure.accumulation;
|
|
|
506 }
|
|
|
507
|
|
|
508
|
|
|
509 /* Extract and set components of symbols */
|
|
|
510
|
|
|
511 static void set_up_buffer_local_cache (Lisp_Object sym,
|
|
|
512 struct symbol_value_buffer_local *bfwd,
|
|
|
513 struct buffer *buf,
|
|
|
514 Lisp_Object new_alist_el,
|
|
|
515 int set_it_p);
|
|
|
516
|
|
|
517 DEFUN ("boundp", Fboundp, 1, 1, 0, /*
|
|
|
518 Return t if SYMBOL's value is not void.
|
|
|
519 */
|
|
|
520 (symbol))
|
|
|
521 {
|
|
|
522 CHECK_SYMBOL (symbol);
|
|
|
523 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt;
|
|
|
524 }
|
|
|
525
|
|
|
526 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /*
|
|
|
527 Return t if SYMBOL has a global (non-bound) value.
|
|
|
528 This is for the byte-compiler; you really shouldn't be using this.
|
|
|
529 */
|
|
|
530 (symbol))
|
|
|
531 {
|
|
|
532 CHECK_SYMBOL (symbol);
|
|
|
533 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt;
|
|
|
534 }
|
|
|
535
|
|
|
536 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /*
|
|
|
537 Return t if SYMBOL's function definition is not void.
|
|
|
538 */
|
|
|
539 (symbol))
|
|
|
540 {
|
|
|
541 CHECK_SYMBOL (symbol);
|
|
|
542 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt;
|
|
|
543 }
|
|
|
544
|
|
|
545 /* Return non-zero if SYM's value or function (the current contents of
|
|
|
546 which should be passed in as VAL) is constant, i.e. unsettable. */
|
|
|
547
|
|
|
548 static int
|
|
|
549 symbol_is_constant (Lisp_Object sym, Lisp_Object val)
|
|
|
550 {
|
|
|
551 /* #### - I wonder if it would be better to just have a new magic value
|
|
|
552 type and make nil, t, and all keywords have that same magic
|
|
|
553 constant_symbol value. This test is awfully specific about what is
|
|
|
554 constant and what isn't. --Stig */
|
|
|
555 if (EQ (sym, Qnil) ||
|
|
|
556 EQ (sym, Qt))
|
|
|
557 return 1;
|
|
|
558
|
|
|
559 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
560 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
561 {
|
|
|
562 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
563 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
564 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
565 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
566 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
567 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
568 return 1;
|
|
|
569 default: break; /* Warning suppression */
|
|
|
570 }
|
|
|
571
|
|
|
572 /* We don't return true for keywords here because they are handled
|
|
|
573 specially by reject_constant_symbols(). */
|
|
|
574 return 0;
|
|
|
575 }
|
|
|
576
|
|
|
577 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is
|
|
|
578 non-zero) to NEWVAL. Make sure this is allowed.
|
|
|
579 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past
|
|
|
580 symbol-value-lisp-magic objects. */
|
|
|
581
|
|
|
582 void
|
|
|
583 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p,
|
|
|
584 Lisp_Object follow_past_lisp_magic)
|
|
|
585 {
|
|
|
586 Lisp_Object val =
|
|
|
587 (function_p ? XSYMBOL (sym)->function
|
|
|
588 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic));
|
|
|
589
|
|
|
590 if (SYMBOL_VALUE_MAGIC_P (val) &&
|
|
|
591 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD)
|
|
563
|
592 invalid_change ("Use `set-specifier' to change a specifier's value",
|
|
|
593 sym);
|
|
428
|
594
|
|
|
595 if (symbol_is_constant (sym, val)
|
|
|
596 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)))
|
|
563
|
597 signal_error_1 (Qsetting_constant,
|
|
|
598 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval));
|
|
428
|
599 }
|
|
|
600
|
|
|
601 /* Verify that it's ok to make SYM buffer-local. This rejects
|
|
|
602 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC
|
|
|
603 specifies whether we delve into symbol-value-lisp-magic objects.
|
|
|
604 (Should be a symbol indicating what action is being taken; that way,
|
|
|
605 we don't delve if there's a handler for that action, but do otherwise.) */
|
|
|
606
|
|
|
607 static void
|
|
|
608 verify_ok_for_buffer_local (Lisp_Object sym,
|
|
|
609 Lisp_Object follow_past_lisp_magic)
|
|
|
610 {
|
|
|
611 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic);
|
|
|
612
|
|
|
613 if (symbol_is_constant (sym, val))
|
|
|
614 goto not_ok;
|
|
|
615 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
616 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
617 {
|
|
|
618 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
619 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
620 /* #### It's theoretically possible for it to be reasonable
|
|
|
621 to have both console-local and buffer-local variables,
|
|
|
622 but I don't want to consider that right now. */
|
|
|
623 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
624 goto not_ok;
|
|
|
625 default: break; /* Warning suppression */
|
|
|
626 }
|
|
|
627
|
|
|
628 return;
|
|
|
629
|
|
|
630 not_ok:
|
|
563
|
631 invalid_change ("Symbol may not be buffer-local", sym);
|
|
428
|
632 }
|
|
|
633
|
|
|
634 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /*
|
|
|
635 Make SYMBOL's value be void.
|
|
|
636 */
|
|
|
637 (symbol))
|
|
|
638 {
|
|
|
639 Fset (symbol, Qunbound);
|
|
|
640 return symbol;
|
|
|
641 }
|
|
|
642
|
|
|
643 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /*
|
|
|
644 Make SYMBOL's function definition be void.
|
|
|
645 */
|
|
|
646 (symbol))
|
|
|
647 {
|
|
|
648 CHECK_SYMBOL (symbol);
|
|
|
649 reject_constant_symbols (symbol, Qunbound, 1, Qt);
|
|
|
650 XSYMBOL (symbol)->function = Qunbound;
|
|
|
651 return symbol;
|
|
|
652 }
|
|
|
653
|
|
|
654 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /*
|
|
|
655 Return SYMBOL's function definition. Error if that is void.
|
|
|
656 */
|
|
|
657 (symbol))
|
|
|
658 {
|
|
|
659 CHECK_SYMBOL (symbol);
|
|
|
660 if (UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
661 signal_void_function_error (symbol);
|
|
|
662 return XSYMBOL (symbol)->function;
|
|
|
663 }
|
|
|
664
|
|
|
665 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /*
|
|
|
666 Return SYMBOL's property list.
|
|
|
667 */
|
|
|
668 (symbol))
|
|
|
669 {
|
|
|
670 CHECK_SYMBOL (symbol);
|
|
|
671 return XSYMBOL (symbol)->plist;
|
|
|
672 }
|
|
|
673
|
|
|
674 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /*
|
|
|
675 Return SYMBOL's name, a string.
|
|
|
676 */
|
|
|
677 (symbol))
|
|
|
678 {
|
|
|
679 CHECK_SYMBOL (symbol);
|
|
793
|
680 return XSYMBOL (symbol)->name;
|
|
428
|
681 }
|
|
|
682
|
|
|
683 DEFUN ("fset", Ffset, 2, 2, 0, /*
|
|
|
684 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
|
685 */
|
|
|
686 (symbol, newdef))
|
|
|
687 {
|
|
|
688 /* This function can GC */
|
|
|
689 CHECK_SYMBOL (symbol);
|
|
|
690 reject_constant_symbols (symbol, newdef, 1, Qt);
|
|
|
691 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
692 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function),
|
|
|
693 Vautoload_queue);
|
|
|
694 XSYMBOL (symbol)->function = newdef;
|
|
|
695 /* Handle automatic advice activation */
|
|
|
696 if (CONSP (XSYMBOL (symbol)->plist) &&
|
|
|
697 !NILP (Fget (symbol, Qad_advice_info, Qnil)))
|
|
|
698 {
|
|
|
699 call2 (Qad_activate, symbol, Qnil);
|
|
|
700 newdef = XSYMBOL (symbol)->function;
|
|
|
701 }
|
|
|
702 return newdef;
|
|
|
703 }
|
|
|
704
|
|
|
705 /* FSFmacs */
|
|
|
706 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /*
|
|
|
707 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
|
708 Associates the function with the current load file, if any.
|
|
|
709 */
|
|
|
710 (symbol, newdef))
|
|
|
711 {
|
|
|
712 /* This function can GC */
|
|
|
713 Ffset (symbol, newdef);
|
|
|
714 LOADHIST_ATTACH (symbol);
|
|
|
715 return newdef;
|
|
|
716 }
|
|
|
717
|
|
|
718
|
|
|
719 DEFUN ("setplist", Fsetplist, 2, 2, 0, /*
|
|
|
720 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST.
|
|
|
721 */
|
|
|
722 (symbol, newplist))
|
|
|
723 {
|
|
|
724 CHECK_SYMBOL (symbol);
|
|
|
725 #if 0 /* Inserted for debugging 6/28/1997 -slb */
|
|
|
726 /* Somebody is setting a property list of integer 0, who? */
|
|
|
727 /* Not this way apparently. */
|
|
|
728 if (EQ(newplist, Qzero)) abort();
|
|
|
729 #endif
|
|
|
730
|
|
|
731 XSYMBOL (symbol)->plist = newplist;
|
|
|
732 return newplist;
|
|
|
733 }
|
|
|
734
|
|
|
735
|
|
|
736 /**********************************************************************/
|
|
|
737 /* symbol-value */
|
|
|
738 /**********************************************************************/
|
|
|
739
|
|
|
740 /* If the contents of the value cell of a symbol is one of the following
|
|
|
741 three types of objects, then the symbol is "magic" in that setting
|
|
|
742 and retrieving its value doesn't just set or retrieve the raw
|
|
|
743 contents of the value cell. None of these objects can escape to
|
|
|
744 the user level, so there is no loss of generality.
|
|
|
745
|
|
|
746 If a symbol is "unbound", then the contents of its value cell is
|
|
|
747 Qunbound. Despite appearances, this is *not* a symbol, but is a
|
|
|
748 symbol-value-forward object. This is so that printing it results
|
|
|
749 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow.
|
|
|
750
|
|
|
751 Logically all of the following objects are "symbol-value-magic"
|
|
|
752 objects, and there are some games played w.r.t. this (#### this
|
|
|
753 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of
|
|
|
754 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of
|
|
|
755 symbol-value-magic object. There are more than three types
|
|
|
756 returned by this macro: in particular, symbol-value-forward
|
|
|
757 has eight subtypes, and symbol-value-buffer-local has two. See
|
|
|
758 symeval.h.
|
|
|
759
|
|
|
760 1. symbol-value-forward
|
|
|
761
|
|
|
762 symbol-value-forward is used for variables whose actual contents
|
|
|
763 are stored in a C variable of some sort, and for Qunbound. The
|
|
|
764 lcheader.next field (which is only used to chain together free
|
|
|
765 lcrecords) holds a pointer to the actual C variable. Included
|
|
|
766 in this type are "buffer-local" variables that are actually
|
|
|
767 stored in the buffer object itself; in this case, the "pointer"
|
|
|
768 is an offset into the struct buffer structure.
|
|
|
769
|
|
|
770 The subtypes are as follows:
|
|
|
771
|
|
|
772 SYMVAL_OBJECT_FORWARD:
|
|
|
773 (declare with DEFVAR_LISP)
|
|
|
774 The value of this variable is stored in a C variable of type
|
|
|
775 "Lisp_Object". Setting this variable sets the C variable.
|
|
|
776 Accessing this variable retrieves a value from the C variable.
|
|
|
777 These variables can be buffer-local -- in this case, the
|
|
|
778 raw symbol-value field gets converted into a
|
|
|
779 symbol-value-buffer-local, whose "current_value" slot contains
|
|
|
780 the symbol-value-forward. (See below.)
|
|
|
781
|
|
|
782 SYMVAL_FIXNUM_FORWARD:
|
|
458
|
783 (declare with DEFVAR_INT)
|
|
|
784 Similar to SYMVAL_OBJECT_FORWARD except that the C variable
|
|
|
785 is of type "Fixnum", a typedef for "EMACS_INT", and the corresponding
|
|
|
786 lisp variable is always the corresponding integer.
|
|
|
787
|
|
428
|
788 SYMVAL_BOOLEAN_FORWARD:
|
|
458
|
789 (declare with DEFVAR_BOOL)
|
|
428
|
790 Similar to SYMVAL_OBJECT_FORWARD except that the C variable
|
|
458
|
791 is of type "int" and is a boolean.
|
|
428
|
792
|
|
|
793 SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
794 SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
795 SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
796 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or
|
|
|
797 DEFVAR_CONST_BOOL)
|
|
|
798 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or
|
|
|
799 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot
|
|
|
800 be changed.
|
|
|
801
|
|
|
802 SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
803 (declare with DEFVAR_SPECIFIER)
|
|
440
|
804 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that the error
|
|
|
805 message you get when attempting to set the value says to use
|
|
428
|
806 `set-specifier' instead.
|
|
|
807
|
|
|
808 SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
809 (declare with DEFVAR_BUFFER_LOCAL)
|
|
|
810 This is used for built-in buffer-local variables -- i.e.
|
|
|
811 Lisp variables whose value is stored in the "struct buffer".
|
|
|
812 Variables of this sort always forward into C "Lisp_Object"
|
|
|
813 fields (although there's no reason in principle that other
|
|
|
814 types for ints and booleans couldn't be added). Note that
|
|
|
815 some of these variables are automatically local in each
|
|
|
816 buffer, while some are only local when they become set
|
|
|
817 (similar to `make-variable-buffer-local'). In these latter
|
|
|
818 cases, of course, the default value shows through in all
|
|
|
819 buffers in which the variable doesn't have a local value.
|
|
|
820 This is implemented by making sure the "struct buffer" field
|
|
|
821 always contains the correct value (whether it's local or
|
|
|
822 a default) and maintaining a mask in the "struct buffer"
|
|
|
823 indicating which fields are local. When `set-default' is
|
|
|
824 called on a variable that's not always local to all buffers,
|
|
|
825 it loops through each buffer and sets the corresponding
|
|
|
826 field in each buffer without a local value for the field,
|
|
|
827 according to the mask.
|
|
|
828
|
|
|
829 Calling `make-local-variable' on a variable of this sort
|
|
|
830 only has the effect of maybe changing the current buffer's mask.
|
|
|
831 Calling `make-variable-buffer-local' on a variable of this
|
|
|
832 sort has no effect at all.
|
|
|
833
|
|
|
834 SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
835 (declare with DEFVAR_CONST_BUFFER_LOCAL)
|
|
|
836 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the
|
|
|
837 value cannot be set.
|
|
|
838
|
|
|
839 SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
840 (declare with DEFVAR_BUFFER_DEFAULTS)
|
|
|
841 This is used for the Lisp variables that contain the
|
|
|
842 default values of built-in buffer-local variables. Setting
|
|
|
843 or referencing one of these variables forwards into a slot
|
|
|
844 in the special struct buffer Vbuffer_defaults.
|
|
|
845
|
|
|
846 SYMVAL_UNBOUND_MARKER:
|
|
|
847 This is used for only one object, Qunbound.
|
|
|
848
|
|
|
849 SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
850 (declare with DEFVAR_CONSOLE_LOCAL)
|
|
|
851 This is used for built-in console-local variables -- i.e.
|
|
|
852 Lisp variables whose value is stored in the "struct console".
|
|
|
853 These work just like built-in buffer-local variables.
|
|
|
854 However, calling `make-local-variable' or
|
|
|
855 `make-variable-buffer-local' on one of these variables
|
|
|
856 is currently disallowed because that would entail having
|
|
|
857 both console-local and buffer-local variables, which is
|
|
|
858 trickier to implement.
|
|
|
859
|
|
|
860 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
861 (declare with DEFVAR_CONST_CONSOLE_LOCAL)
|
|
|
862 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the
|
|
|
863 value cannot be set.
|
|
|
864
|
|
|
865 SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
866 (declare with DEFVAR_CONSOLE_DEFAULTS)
|
|
|
867 This is used for the Lisp variables that contain the
|
|
|
868 default values of built-in console-local variables. Setting
|
|
|
869 or referencing one of these variables forwards into a slot
|
|
|
870 in the special struct console Vconsole_defaults.
|
|
|
871
|
|
|
872
|
|
|
873 2. symbol-value-buffer-local
|
|
|
874
|
|
|
875 symbol-value-buffer-local is used for variables that have had
|
|
|
876 `make-local-variable' or `make-variable-buffer-local' applied
|
|
|
877 to them. This object contains an alist mapping buffers to
|
|
|
878 values. In addition, the object contains a "current value",
|
|
|
879 which is the value in some buffer. Whenever you access the
|
|
|
880 variable with `symbol-value' or set it with `set' or `setq',
|
|
|
881 things are switched around so that the "current value"
|
|
|
882 refers to the current buffer, if it wasn't already. This
|
|
|
883 way, repeated references to a variable in the same buffer
|
|
|
884 are almost as efficient as if the variable weren't buffer
|
|
|
885 local. Note that the alist may not be up-to-date w.r.t.
|
|
|
886 the buffer whose value is current, as the "current value"
|
|
|
887 cache is normally only flushed into the alist when the
|
|
|
888 buffer it refers to changes.
|
|
|
889
|
|
|
890 Note also that it is possible for `make-local-variable'
|
|
|
891 or `make-variable-buffer-local' to be called on a variable
|
|
|
892 that forwards into a C variable (i.e. a variable whose
|
|
|
893 value cell is a symbol-value-forward). In this case,
|
|
|
894 the value cell becomes a symbol-value-buffer-local (as
|
|
|
895 always), and the symbol-value-forward moves into
|
|
|
896 the "current value" cell in this object. Also, in
|
|
|
897 this case the "current value" *always* refers to the
|
|
|
898 current buffer, so that the values of the C variable
|
|
|
899 always is the correct value for the current buffer.
|
|
|
900 set_buffer_internal() automatically updates the current-value
|
|
|
901 cells of all buffer-local variables that forward into C
|
|
|
902 variables. (There is a list of all buffer-local variables
|
|
|
903 that is maintained for this and other purposes.)
|
|
|
904
|
|
|
905 Note that only certain types of `symbol-value-forward' objects
|
|
|
906 can find their way into the "current value" cell of a
|
|
|
907 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD,
|
|
|
908 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and
|
|
|
909 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot
|
|
|
910 be buffer-local because they are unsettable;
|
|
|
911 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that
|
|
|
912 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local
|
|
|
913 does not have much of an effect (it's already buffer-local); and
|
|
|
914 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because
|
|
|
915 that's not currently implemented.
|
|
|
916
|
|
|
917
|
|
|
918 3. symbol-value-varalias
|
|
|
919
|
|
|
920 A symbol-value-varalias object is used for variables that
|
|
|
921 are aliases for other variables. This object contains
|
|
|
922 the symbol that this variable is aliased to.
|
|
|
923 symbol-value-varalias objects cannot occur anywhere within
|
|
|
924 a symbol-value-buffer-local object, and most of the
|
|
|
925 low-level functions below do not accept them; you need
|
|
|
926 to call follow_varalias_pointers to get the actual
|
|
|
927 symbol to operate on. */
|
|
|
928
|
|
|
929 static Lisp_Object
|
|
|
930 mark_symbol_value_buffer_local (Lisp_Object obj)
|
|
|
931 {
|
|
|
932 struct symbol_value_buffer_local *bfwd;
|
|
|
933
|
|
800
|
934 #ifdef ERROR_CHECK_TYPES
|
|
428
|
935 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL ||
|
|
|
936 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
937 #endif
|
|
|
938
|
|
|
939 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj);
|
|
|
940 mark_object (bfwd->default_value);
|
|
|
941 mark_object (bfwd->current_value);
|
|
|
942 mark_object (bfwd->current_buffer);
|
|
|
943 return bfwd->current_alist_element;
|
|
|
944 }
|
|
|
945
|
|
|
946 static Lisp_Object
|
|
|
947 mark_symbol_value_lisp_magic (Lisp_Object obj)
|
|
|
948 {
|
|
|
949 struct symbol_value_lisp_magic *bfwd;
|
|
|
950 int i;
|
|
|
951
|
|
|
952 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC);
|
|
|
953
|
|
|
954 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj);
|
|
|
955 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
956 {
|
|
|
957 mark_object (bfwd->handler[i]);
|
|
|
958 mark_object (bfwd->harg[i]);
|
|
|
959 }
|
|
|
960 return bfwd->shadowed;
|
|
|
961 }
|
|
|
962
|
|
|
963 static Lisp_Object
|
|
|
964 mark_symbol_value_varalias (Lisp_Object obj)
|
|
|
965 {
|
|
|
966 struct symbol_value_varalias *bfwd;
|
|
|
967
|
|
|
968 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS);
|
|
|
969
|
|
|
970 bfwd = XSYMBOL_VALUE_VARALIAS (obj);
|
|
|
971 mark_object (bfwd->shadowed);
|
|
|
972 return bfwd->aliasee;
|
|
|
973 }
|
|
|
974
|
|
|
975 /* Should never, ever be called. (except by an external debugger) */
|
|
|
976 void
|
|
|
977 print_symbol_value_magic (Lisp_Object obj,
|
|
|
978 Lisp_Object printcharfun, int escapeflag)
|
|
|
979 {
|
|
800
|
980 write_fmt_string (printcharfun,
|
|
|
981 "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%lx>",
|
|
|
982 XRECORD_LHEADER_IMPLEMENTATION (obj)->name,
|
|
|
983 XSYMBOL_VALUE_MAGIC_TYPE (obj),
|
|
|
984 (long) XPNTR (obj));
|
|
428
|
985 }
|
|
|
986
|
|
|
987 static const struct lrecord_description symbol_value_forward_description[] = {
|
|
|
988 { XD_END }
|
|
|
989 };
|
|
|
990
|
|
|
991 static const struct lrecord_description symbol_value_buffer_local_description[] = {
|
|
446
|
992 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, default_value) },
|
|
|
993 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_value) },
|
|
|
994 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_buffer) },
|
|
|
995 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, current_alist_element) },
|
|
428
|
996 { XD_END }
|
|
|
997 };
|
|
|
998
|
|
|
999 static const struct lrecord_description symbol_value_lisp_magic_description[] = {
|
|
440
|
1000 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, handler), 2*MAGIC_HANDLER_MAX+1 },
|
|
428
|
1001 { XD_END }
|
|
|
1002 };
|
|
|
1003
|
|
|
1004 static const struct lrecord_description symbol_value_varalias_description[] = {
|
|
440
|
1005 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, aliasee) },
|
|
|
1006 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, shadowed) },
|
|
428
|
1007 { XD_END }
|
|
|
1008 };
|
|
|
1009
|
|
|
1010 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-forward",
|
|
|
1011 symbol_value_forward,
|
|
442
|
1012 0,
|
|
428
|
1013 print_symbol_value_magic, 0, 0, 0,
|
|
|
1014 symbol_value_forward_description,
|
|
|
1015 struct symbol_value_forward);
|
|
|
1016
|
|
|
1017 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-buffer-local",
|
|
|
1018 symbol_value_buffer_local,
|
|
|
1019 mark_symbol_value_buffer_local,
|
|
|
1020 print_symbol_value_magic, 0, 0, 0,
|
|
|
1021 symbol_value_buffer_local_description,
|
|
|
1022 struct symbol_value_buffer_local);
|
|
|
1023
|
|
|
1024 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-lisp-magic",
|
|
|
1025 symbol_value_lisp_magic,
|
|
|
1026 mark_symbol_value_lisp_magic,
|
|
|
1027 print_symbol_value_magic, 0, 0, 0,
|
|
|
1028 symbol_value_lisp_magic_description,
|
|
|
1029 struct symbol_value_lisp_magic);
|
|
|
1030
|
|
|
1031 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-varalias",
|
|
|
1032 symbol_value_varalias,
|
|
|
1033 mark_symbol_value_varalias,
|
|
|
1034 print_symbol_value_magic, 0, 0, 0,
|
|
|
1035 symbol_value_varalias_description,
|
|
|
1036 struct symbol_value_varalias);
|
|
|
1037
|
|
|
1038
|
|
|
1039 /* Getting and setting values of symbols */
|
|
|
1040
|
|
|
1041 /* Given the raw contents of a symbol value cell, return the Lisp value of
|
|
|
1042 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local,
|
|
|
1043 symbol-value-lisp-magic, or symbol-value-varalias.
|
|
|
1044
|
|
|
1045 BUFFER specifies a buffer, and is used for built-in buffer-local
|
|
|
1046 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD.
|
|
|
1047 Note that such variables are never encapsulated in a
|
|
|
1048 symbol-value-buffer-local structure.
|
|
|
1049
|
|
|
1050 CONSOLE specifies a console, and is used for built-in console-local
|
|
|
1051 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD.
|
|
|
1052 Note that such variables are (currently) never encapsulated in a
|
|
|
1053 symbol-value-buffer-local structure.
|
|
|
1054 */
|
|
|
1055
|
|
|
1056 static Lisp_Object
|
|
|
1057 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer,
|
|
|
1058 struct console *console)
|
|
|
1059 {
|
|
442
|
1060 const struct symbol_value_forward *fwd;
|
|
428
|
1061
|
|
|
1062 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1063 return valcontents;
|
|
|
1064
|
|
|
1065 fwd = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1066 switch (fwd->magic.type)
|
|
|
1067 {
|
|
|
1068 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1069 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
458
|
1070 return make_int (*((Fixnum *)symbol_value_forward_forward (fwd)));
|
|
428
|
1071
|
|
|
1072 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1073 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
1074 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil;
|
|
|
1075
|
|
|
1076 case SYMVAL_OBJECT_FORWARD:
|
|
|
1077 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
1078 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
1079 return *((Lisp_Object *)symbol_value_forward_forward (fwd));
|
|
|
1080
|
|
|
1081 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1082 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1083 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1084 - (char *)&buffer_local_flags))));
|
|
|
1085
|
|
|
1086
|
|
|
1087 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1088 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
1089 assert (buffer);
|
|
|
1090 return (*((Lisp_Object *)((char *)buffer
|
|
|
1091 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1092 - (char *)&buffer_local_flags))));
|
|
|
1093
|
|
|
1094 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1095 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1096 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1097 - (char *)&console_local_flags))));
|
|
|
1098
|
|
|
1099 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1100 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
1101 assert (console);
|
|
|
1102 return (*((Lisp_Object *)((char *)console
|
|
|
1103 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1104 - (char *)&console_local_flags))));
|
|
|
1105
|
|
|
1106 case SYMVAL_UNBOUND_MARKER:
|
|
|
1107 return valcontents;
|
|
|
1108
|
|
|
1109 default:
|
|
|
1110 abort ();
|
|
|
1111 }
|
|
|
1112 return Qnil; /* suppress compiler warning */
|
|
|
1113 }
|
|
|
1114
|
|
|
1115 /* Set the value of default-buffer-local variable SYM to VALUE. */
|
|
|
1116
|
|
|
1117 static void
|
|
|
1118 set_default_buffer_slot_variable (Lisp_Object sym,
|
|
|
1119 Lisp_Object value)
|
|
|
1120 {
|
|
|
1121 /* Handle variables like case-fold-search that have special slots in
|
|
|
1122 the buffer. Make them work apparently like buffer_local variables.
|
|
|
1123 */
|
|
|
1124 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1125 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1126 have already called it. */
|
|
|
1127 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
442
|
1128 const struct symbol_value_forward *fwd
|
|
428
|
1129 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1130 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
1131 - (char *) &buffer_local_flags);
|
|
|
1132 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1133 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1134 int flags) = symbol_value_forward_magicfun (fwd);
|
|
|
1135
|
|
|
1136 *((Lisp_Object *) (offset + (char *) XBUFFER (Vbuffer_defaults)))
|
|
|
1137 = value;
|
|
|
1138
|
|
|
1139 if (mask > 0) /* Not always per-buffer */
|
|
|
1140 {
|
|
|
1141 /* Set value in each buffer which hasn't shadowed the default */
|
|
|
1142 LIST_LOOP_2 (elt, Vbuffer_alist)
|
|
|
1143 {
|
|
|
1144 struct buffer *b = XBUFFER (XCDR (elt));
|
|
|
1145 if (!(b->local_var_flags & mask))
|
|
|
1146 {
|
|
|
1147 if (magicfun)
|
|
771
|
1148 magicfun (sym, &value, wrap_buffer (b), 0);
|
|
428
|
1149 *((Lisp_Object *) (offset + (char *) b)) = value;
|
|
|
1150 }
|
|
|
1151 }
|
|
|
1152 }
|
|
|
1153 }
|
|
|
1154
|
|
|
1155 /* Set the value of default-console-local variable SYM to VALUE. */
|
|
|
1156
|
|
|
1157 static void
|
|
|
1158 set_default_console_slot_variable (Lisp_Object sym,
|
|
|
1159 Lisp_Object value)
|
|
|
1160 {
|
|
|
1161 /* Handle variables like case-fold-search that have special slots in
|
|
|
1162 the console. Make them work apparently like console_local variables.
|
|
|
1163 */
|
|
|
1164 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1165 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1166 have already called it. */
|
|
|
1167 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
442
|
1168 const struct symbol_value_forward *fwd
|
|
428
|
1169 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1170 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
1171 - (char *) &console_local_flags);
|
|
|
1172 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1173 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1174 int flags) = symbol_value_forward_magicfun (fwd);
|
|
|
1175
|
|
|
1176 *((Lisp_Object *) (offset + (char *) XCONSOLE (Vconsole_defaults)))
|
|
|
1177 = value;
|
|
|
1178
|
|
|
1179 if (mask > 0) /* Not always per-console */
|
|
|
1180 {
|
|
|
1181 /* Set value in each console which hasn't shadowed the default */
|
|
|
1182 LIST_LOOP_2 (console, Vconsole_list)
|
|
|
1183 {
|
|
|
1184 struct console *d = XCONSOLE (console);
|
|
|
1185 if (!(d->local_var_flags & mask))
|
|
|
1186 {
|
|
|
1187 if (magicfun)
|
|
|
1188 magicfun (sym, &value, console, 0);
|
|
|
1189 *((Lisp_Object *) (offset + (char *) d)) = value;
|
|
|
1190 }
|
|
|
1191 }
|
|
|
1192 }
|
|
|
1193 }
|
|
|
1194
|
|
|
1195 /* Store NEWVAL into SYM.
|
|
|
1196
|
|
|
1197 SYM's value slot may *not* be types (5) or (6) above,
|
|
|
1198 i.e. no symbol-value-varalias objects. (You should have
|
|
|
1199 forwarded past all of these.)
|
|
|
1200
|
|
|
1201 SYM should not be an unsettable symbol or a symbol with
|
|
|
1202 a magic `set-value' handler (unless you want to explicitly
|
|
|
1203 ignore this handler).
|
|
|
1204
|
|
|
1205 OVALUE is the current value of SYM, but forwarded past any
|
|
|
1206 symbol-value-buffer-local and symbol-value-lisp-magic objects.
|
|
|
1207 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be
|
|
|
1208 the contents of its current-value cell.) NEWVAL may only be
|
|
|
1209 a simple value or Qunbound. If SYM is a symbol-value-buffer-local,
|
|
|
1210 this function will only modify its current-value cell, which should
|
|
|
1211 already be set up to point to the current buffer.
|
|
|
1212 */
|
|
|
1213
|
|
|
1214 static void
|
|
|
1215 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue,
|
|
|
1216 Lisp_Object newval)
|
|
|
1217 {
|
|
|
1218 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue))
|
|
|
1219 {
|
|
|
1220 Lisp_Object *store_pointer = value_slot_past_magic (sym);
|
|
|
1221
|
|
|
1222 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer))
|
|
|
1223 store_pointer =
|
|
|
1224 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value;
|
|
|
1225
|
|
|
1226 assert (UNBOUNDP (*store_pointer)
|
|
|
1227 || !SYMBOL_VALUE_MAGIC_P (*store_pointer));
|
|
|
1228 *store_pointer = newval;
|
|
|
1229 }
|
|
|
1230 else
|
|
|
1231 {
|
|
442
|
1232 const struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue);
|
|
428
|
1233 int (*magicfun) (Lisp_Object simm, Lisp_Object *val,
|
|
|
1234 Lisp_Object in_object, int flags)
|
|
|
1235 = symbol_value_forward_magicfun (fwd);
|
|
|
1236
|
|
|
1237 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue))
|
|
|
1238 {
|
|
|
1239 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1240 CHECK_INT (newval);
|
|
|
1241 if (magicfun)
|
|
|
1242 magicfun (sym, &newval, Qnil, 0);
|
|
458
|
1243 *((Fixnum *) symbol_value_forward_forward (fwd)) = XINT (newval);
|
|
428
|
1244 return;
|
|
|
1245
|
|
|
1246 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1247 if (magicfun)
|
|
|
1248 magicfun (sym, &newval, Qnil, 0);
|
|
|
1249 *((int *) symbol_value_forward_forward (fwd))
|
|
|
1250 = !NILP (newval);
|
|
|
1251 return;
|
|
|
1252
|
|
|
1253 case SYMVAL_OBJECT_FORWARD:
|
|
|
1254 if (magicfun)
|
|
|
1255 magicfun (sym, &newval, Qnil, 0);
|
|
|
1256 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval;
|
|
|
1257 return;
|
|
|
1258
|
|
|
1259 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1260 set_default_buffer_slot_variable (sym, newval);
|
|
|
1261 return;
|
|
|
1262
|
|
|
1263 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1264 if (magicfun)
|
|
771
|
1265 magicfun (sym, &newval, wrap_buffer (current_buffer), 0);
|
|
428
|
1266 *((Lisp_Object *) ((char *) current_buffer
|
|
|
1267 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1268 - (char *) &buffer_local_flags)))
|
|
|
1269 = newval;
|
|
|
1270 return;
|
|
|
1271
|
|
|
1272 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1273 set_default_console_slot_variable (sym, newval);
|
|
|
1274 return;
|
|
|
1275
|
|
|
1276 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1277 if (magicfun)
|
|
|
1278 magicfun (sym, &newval, Vselected_console, 0);
|
|
|
1279 *((Lisp_Object *) ((char *) XCONSOLE (Vselected_console)
|
|
|
1280 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1281 - (char *) &console_local_flags)))
|
|
|
1282 = newval;
|
|
|
1283 return;
|
|
|
1284
|
|
|
1285 default:
|
|
|
1286 abort ();
|
|
|
1287 }
|
|
|
1288 }
|
|
|
1289 }
|
|
|
1290
|
|
|
1291 /* Given a per-buffer variable SYMBOL and its raw value-cell contents
|
|
|
1292 BFWD, locate and return a pointer to the element in BUFFER's
|
|
|
1293 local_var_alist for SYMBOL. The return value will be Qnil if
|
|
|
1294 BUFFER does not have its own value for SYMBOL (i.e. the default
|
|
|
1295 value is seen in that buffer).
|
|
|
1296 */
|
|
|
1297
|
|
|
1298 static Lisp_Object
|
|
|
1299 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol,
|
|
|
1300 struct symbol_value_buffer_local *bfwd)
|
|
|
1301 {
|
|
|
1302 if (!NILP (bfwd->current_buffer) &&
|
|
|
1303 XBUFFER (bfwd->current_buffer) == buffer)
|
|
|
1304 /* This is just an optimization of the below. */
|
|
|
1305 return bfwd->current_alist_element;
|
|
|
1306 else
|
|
|
1307 return assq_no_quit (symbol, buffer->local_var_alist);
|
|
|
1308 }
|
|
|
1309
|
|
|
1310 /* [Remember that the slot that mirrors CURRENT-VALUE in the
|
|
|
1311 symbol-value-buffer-local of a per-buffer variable -- i.e. the
|
|
|
1312 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE
|
|
|
1313 slot -- may be out of date.]
|
|
|
1314
|
|
|
1315 Write out any cached value in buffer-local variable SYMBOL's
|
|
|
1316 buffer-local structure, which is passed in as BFWD.
|
|
|
1317 */
|
|
|
1318
|
|
|
1319 static void
|
|
|
1320 write_out_buffer_local_cache (Lisp_Object symbol,
|
|
|
1321 struct symbol_value_buffer_local *bfwd)
|
|
|
1322 {
|
|
|
1323 if (!NILP (bfwd->current_buffer))
|
|
|
1324 {
|
|
|
1325 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD
|
|
|
1326 uses it, and that type cannot be inside a symbol-value-buffer-local */
|
|
|
1327 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0);
|
|
|
1328 if (NILP (bfwd->current_alist_element))
|
|
|
1329 /* current_value may be updated more recently than default_value */
|
|
|
1330 bfwd->default_value = cval;
|
|
|
1331 else
|
|
|
1332 Fsetcdr (bfwd->current_alist_element, cval);
|
|
|
1333 }
|
|
|
1334 }
|
|
|
1335
|
|
|
1336 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure.
|
|
|
1337 Set up BFWD's cache for validity in buffer BUF. This assumes that
|
|
|
1338 the cache is currently in a consistent state (this can include
|
|
|
1339 not having any value cached, if BFWD->CURRENT_BUFFER is nil).
|
|
|
1340
|
|
|
1341 If the cache is already set up for BUF, this function does nothing
|
|
|
1342 at all.
|
|
|
1343
|
|
|
1344 Otherwise, if SYM forwards out to a C variable, this also forwards
|
|
|
1345 SYM's value in BUF out to the variable. Therefore, you generally
|
|
|
1346 only want to call this when BUF is, or is about to become, the
|
|
|
1347 current buffer.
|
|
|
1348
|
|
|
1349 (Otherwise, you can just retrieve the value without changing the
|
|
|
1350 cache, at the expense of slower retrieval.)
|
|
|
1351 */
|
|
|
1352
|
|
|
1353 static void
|
|
|
1354 set_up_buffer_local_cache (Lisp_Object sym,
|
|
|
1355 struct symbol_value_buffer_local *bfwd,
|
|
|
1356 struct buffer *buf,
|
|
|
1357 Lisp_Object new_alist_el,
|
|
|
1358 int set_it_p)
|
|
|
1359 {
|
|
|
1360 Lisp_Object new_val;
|
|
|
1361
|
|
|
1362 if (!NILP (bfwd->current_buffer)
|
|
|
1363 && buf == XBUFFER (bfwd->current_buffer))
|
|
|
1364 /* Cache is already set up. */
|
|
|
1365 return;
|
|
|
1366
|
|
|
1367 /* Flush out the old cache. */
|
|
|
1368 write_out_buffer_local_cache (sym, bfwd);
|
|
|
1369
|
|
|
1370 /* Retrieve the new alist element and new value. */
|
|
|
1371 if (NILP (new_alist_el)
|
|
|
1372 && set_it_p)
|
|
|
1373 new_alist_el = buffer_local_alist_element (buf, sym, bfwd);
|
|
|
1374
|
|
|
1375 if (NILP (new_alist_el))
|
|
|
1376 new_val = bfwd->default_value;
|
|
|
1377 else
|
|
|
1378 new_val = Fcdr (new_alist_el);
|
|
|
1379
|
|
|
1380 bfwd->current_alist_element = new_alist_el;
|
|
793
|
1381 bfwd->current_buffer = wrap_buffer (buf);
|
|
428
|
1382
|
|
|
1383 /* Now store the value into the current-value slot.
|
|
|
1384 We don't simply write it there, because the current-value
|
|
|
1385 slot might be a forwarding pointer, in which case we need
|
|
|
1386 to instead write the value into the C variable.
|
|
|
1387
|
|
|
1388 We might also want to call a magic function.
|
|
|
1389
|
|
|
1390 So instead, we call this function. */
|
|
|
1391 store_symval_forwarding (sym, bfwd->current_value, new_val);
|
|
|
1392 }
|
|
|
1393
|
|
446
|
1394
|
|
|
1395 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure.
|
|
|
1396 Flush the cache. BFWD->CURRENT_BUFFER will be nil after this operation.
|
|
|
1397 */
|
|
|
1398
|
|
|
1399 static void
|
|
|
1400 flush_buffer_local_cache (Lisp_Object sym,
|
|
|
1401 struct symbol_value_buffer_local *bfwd)
|
|
|
1402 {
|
|
|
1403 if (NILP (bfwd->current_buffer))
|
|
|
1404 /* Cache is already flushed. */
|
|
|
1405 return;
|
|
|
1406
|
|
|
1407 /* Flush out the old cache. */
|
|
|
1408 write_out_buffer_local_cache (sym, bfwd);
|
|
|
1409
|
|
|
1410 bfwd->current_alist_element = Qnil;
|
|
|
1411 bfwd->current_buffer = Qnil;
|
|
|
1412
|
|
|
1413 /* Now store default the value into the current-value slot.
|
|
|
1414 We don't simply write it there, because the current-value
|
|
|
1415 slot might be a forwarding pointer, in which case we need
|
|
|
1416 to instead write the value into the C variable.
|
|
|
1417
|
|
|
1418 We might also want to call a magic function.
|
|
|
1419
|
|
|
1420 So instead, we call this function. */
|
|
|
1421 store_symval_forwarding (sym, bfwd->current_value, bfwd->default_value);
|
|
|
1422 }
|
|
|
1423
|
|
|
1424 /* Flush all the buffer-local variable caches. Whoever has a
|
|
|
1425 non-interned buffer-local variable will be spanked. Whoever has a
|
|
|
1426 magic variable that interns or uninterns symbols... I don't even
|
|
|
1427 want to think about it.
|
|
|
1428 */
|
|
|
1429
|
|
|
1430 void
|
|
|
1431 flush_all_buffer_local_cache (void)
|
|
|
1432 {
|
|
|
1433 Lisp_Object *syms = XVECTOR_DATA (Vobarray);
|
|
|
1434 long count = XVECTOR_LENGTH (Vobarray);
|
|
|
1435 long i;
|
|
|
1436
|
|
|
1437 for (i=0; i<count; i++)
|
|
|
1438 {
|
|
|
1439 Lisp_Object sym = syms[i];
|
|
|
1440 Lisp_Object value;
|
|
|
1441
|
|
|
1442 if (!ZEROP (sym))
|
|
|
1443 for(;;)
|
|
|
1444 {
|
|
|
1445 Lisp_Symbol *next;
|
|
|
1446 assert (SYMBOLP (sym));
|
|
|
1447 value = fetch_value_maybe_past_magic (sym, Qt);
|
|
|
1448 if (SYMBOL_VALUE_BUFFER_LOCAL_P (value))
|
|
|
1449 flush_buffer_local_cache (sym, XSYMBOL_VALUE_BUFFER_LOCAL (value));
|
|
|
1450
|
|
|
1451 next = symbol_next (XSYMBOL (sym));
|
|
|
1452 if (!next)
|
|
|
1453 break;
|
|
793
|
1454 sym = wrap_symbol (next);
|
|
446
|
1455 }
|
|
|
1456 }
|
|
|
1457 }
|
|
|
1458
|
|
428
|
1459
|
|
|
1460 void
|
|
|
1461 kill_buffer_local_variables (struct buffer *buf)
|
|
|
1462 {
|
|
|
1463 Lisp_Object prev = Qnil;
|
|
|
1464 Lisp_Object alist;
|
|
|
1465
|
|
|
1466 /* Any which are supposed to be permanent,
|
|
|
1467 make local again, with the same values they had. */
|
|
|
1468
|
|
|
1469 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist))
|
|
|
1470 {
|
|
|
1471 Lisp_Object sym = XCAR (XCAR (alist));
|
|
|
1472 struct symbol_value_buffer_local *bfwd;
|
|
|
1473 /* Variables with a symbol-value-varalias should not be here
|
|
|
1474 (we should have forwarded past them) and there must be a
|
|
|
1475 symbol-value-buffer-local. If there's a symbol-value-lisp-magic,
|
|
|
1476 just forward past it; if the variable has a handler, it was
|
|
|
1477 already called. */
|
|
|
1478 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt);
|
|
|
1479
|
|
|
1480 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value));
|
|
|
1481 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value);
|
|
|
1482
|
|
|
1483 if (!NILP (Fget (sym, Qpermanent_local, Qnil)))
|
|
|
1484 /* prev points to the last alist element that is still
|
|
|
1485 staying around, so *only* update it now. This didn't
|
|
|
1486 used to be the case; this bug has been around since
|
|
|
1487 mly's rewrite two years ago! */
|
|
|
1488 prev = alist;
|
|
|
1489 else
|
|
|
1490 {
|
|
|
1491 /* Really truly kill it. */
|
|
|
1492 if (!NILP (prev))
|
|
|
1493 XCDR (prev) = XCDR (alist);
|
|
|
1494 else
|
|
|
1495 buf->local_var_alist = XCDR (alist);
|
|
|
1496
|
|
|
1497 /* We just effectively changed the value for this variable
|
|
|
1498 in BUF. So: */
|
|
|
1499
|
|
|
1500 /* (1) If the cache is caching BUF, invalidate the cache. */
|
|
|
1501 if (!NILP (bfwd->current_buffer) &&
|
|
|
1502 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1503 bfwd->current_buffer = Qnil;
|
|
|
1504
|
|
|
1505 /* (2) If we changed the value in current_buffer and this
|
|
|
1506 variable forwards to a C variable, we need to change the
|
|
|
1507 value of the C variable. set_up_buffer_local_cache()
|
|
|
1508 will do this. It doesn't hurt to do it whenever
|
|
|
1509 BUF == current_buffer, so just go ahead and do that. */
|
|
|
1510 if (buf == current_buffer)
|
|
|
1511 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0);
|
|
|
1512 }
|
|
|
1513 }
|
|
|
1514 }
|
|
|
1515
|
|
|
1516 static Lisp_Object
|
|
|
1517 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf,
|
|
|
1518 struct console *con, int swap_it_in,
|
|
|
1519 Lisp_Object symcons, int set_it_p)
|
|
|
1520 {
|
|
|
1521 Lisp_Object valcontents;
|
|
|
1522
|
|
|
1523 retry:
|
|
|
1524 valcontents = XSYMBOL (sym)->value;
|
|
|
1525
|
|
|
1526 retry_2:
|
|
|
1527 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1528 return valcontents;
|
|
|
1529
|
|
|
1530 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1531 {
|
|
|
1532 case SYMVAL_LISP_MAGIC:
|
|
|
1533 /* #### kludge */
|
|
|
1534 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1535 /* semi-change-o */
|
|
|
1536 goto retry_2;
|
|
|
1537
|
|
|
1538 case SYMVAL_VARALIAS:
|
|
|
1539 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1540 symcons = Qnil;
|
|
|
1541 /* presto change-o! */
|
|
|
1542 goto retry;
|
|
|
1543
|
|
|
1544 case SYMVAL_BUFFER_LOCAL:
|
|
|
1545 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1546 {
|
|
|
1547 struct symbol_value_buffer_local *bfwd
|
|
|
1548 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1549
|
|
|
1550 if (swap_it_in)
|
|
|
1551 {
|
|
|
1552 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p);
|
|
|
1553 valcontents = bfwd->current_value;
|
|
|
1554 }
|
|
|
1555 else
|
|
|
1556 {
|
|
|
1557 if (!NILP (bfwd->current_buffer) &&
|
|
|
1558 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1559 valcontents = bfwd->current_value;
|
|
|
1560 else if (NILP (symcons))
|
|
|
1561 {
|
|
|
1562 if (set_it_p)
|
|
|
1563 valcontents = assq_no_quit (sym, buf->local_var_alist);
|
|
|
1564 if (NILP (valcontents))
|
|
|
1565 valcontents = bfwd->default_value;
|
|
|
1566 else
|
|
|
1567 valcontents = XCDR (valcontents);
|
|
|
1568 }
|
|
|
1569 else
|
|
|
1570 valcontents = XCDR (symcons);
|
|
|
1571 }
|
|
|
1572 break;
|
|
|
1573 }
|
|
|
1574
|
|
|
1575 default:
|
|
|
1576 break;
|
|
|
1577 }
|
|
|
1578 return do_symval_forwarding (valcontents, buf, con);
|
|
|
1579 }
|
|
|
1580
|
|
|
1581
|
|
|
1582 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not
|
|
|
1583 bound. Note that it must not be possible to QUIT within this
|
|
|
1584 function. */
|
|
|
1585
|
|
|
1586 Lisp_Object
|
|
|
1587 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer)
|
|
|
1588 {
|
|
|
1589 struct buffer *buf;
|
|
|
1590
|
|
|
1591 CHECK_SYMBOL (sym);
|
|
|
1592
|
|
|
1593 if (NILP (buffer))
|
|
|
1594 buf = current_buffer;
|
|
|
1595 else
|
|
|
1596 {
|
|
|
1597 CHECK_BUFFER (buffer);
|
|
|
1598 buf = XBUFFER (buffer);
|
|
|
1599 }
|
|
|
1600
|
|
|
1601 return find_symbol_value_1 (sym, buf,
|
|
|
1602 /* If it bombs out at startup due to a
|
|
|
1603 Lisp error, this may be nil. */
|
|
|
1604 CONSOLEP (Vselected_console)
|
|
|
1605 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1);
|
|
|
1606 }
|
|
|
1607
|
|
|
1608 static Lisp_Object
|
|
|
1609 symbol_value_in_console (Lisp_Object sym, Lisp_Object console)
|
|
|
1610 {
|
|
|
1611 CHECK_SYMBOL (sym);
|
|
|
1612
|
|
|
1613 if (NILP (console))
|
|
|
1614 console = Vselected_console;
|
|
|
1615 else
|
|
|
1616 CHECK_CONSOLE (console);
|
|
|
1617
|
|
|
1618 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0,
|
|
|
1619 Qnil, 1);
|
|
|
1620 }
|
|
|
1621
|
|
|
1622 /* Return the current value of SYM. The difference between this function
|
|
|
1623 and calling symbol_value_in_buffer with a BUFFER of Qnil is that
|
|
|
1624 this updates the CURRENT_VALUE slot of buffer-local variables to
|
|
|
1625 point to the current buffer, while symbol_value_in_buffer doesn't. */
|
|
|
1626
|
|
|
1627 Lisp_Object
|
|
|
1628 find_symbol_value (Lisp_Object sym)
|
|
|
1629 {
|
|
|
1630 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1631 and Vselected_console is Qnil, early in initialization. */
|
|
|
1632 struct console *con;
|
|
|
1633 Lisp_Object valcontents;
|
|
|
1634
|
|
|
1635 CHECK_SYMBOL (sym);
|
|
|
1636
|
|
|
1637 valcontents = XSYMBOL (sym)->value;
|
|
|
1638 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1639 return valcontents;
|
|
|
1640
|
|
|
1641 if (CONSOLEP (Vselected_console))
|
|
|
1642 con = XCONSOLE (Vselected_console);
|
|
|
1643 else
|
|
|
1644 {
|
|
|
1645 /* This can also get called while we're preparing to shutdown.
|
|
|
1646 #### What should really happen in that case? Should we
|
|
|
1647 actually fix things so we can't get here in that case? */
|
|
|
1648 #ifndef PDUMP
|
|
|
1649 assert (!initialized || preparing_for_armageddon);
|
|
|
1650 #endif
|
|
|
1651 con = 0;
|
|
|
1652 }
|
|
|
1653
|
|
|
1654 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1);
|
|
|
1655 }
|
|
|
1656
|
|
|
1657 /* This is an optimized function for quick lookup of buffer local symbols
|
|
|
1658 by avoiding O(n) search. This will work when either:
|
|
|
1659 a) We have already found the symbol e.g. by traversing local_var_alist.
|
|
|
1660 or
|
|
|
1661 b) We know that the symbol will not be found in the current buffer's
|
|
|
1662 list of local variables.
|
|
|
1663 In the former case, find_it_p is 1 and symbol_cons is the element from
|
|
|
1664 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons
|
|
|
1665 is the symbol.
|
|
|
1666
|
|
|
1667 This function is called from set_buffer_internal which does both of these
|
|
|
1668 things. */
|
|
|
1669
|
|
|
1670 Lisp_Object
|
|
|
1671 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p)
|
|
|
1672 {
|
|
|
1673 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1674 and Vselected_console is Qnil, early in initialization. */
|
|
|
1675 struct console *con;
|
|
|
1676 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons;
|
|
|
1677
|
|
|
1678 CHECK_SYMBOL (sym);
|
|
|
1679 if (CONSOLEP (Vselected_console))
|
|
|
1680 con = XCONSOLE (Vselected_console);
|
|
|
1681 else
|
|
|
1682 {
|
|
|
1683 /* This can also get called while we're preparing to shutdown.
|
|
|
1684 #### What should really happen in that case? Should we
|
|
|
1685 actually fix things so we can't get here in that case? */
|
|
|
1686 #ifndef PDUMP
|
|
|
1687 assert (!initialized || preparing_for_armageddon);
|
|
|
1688 #endif
|
|
|
1689 con = 0;
|
|
|
1690 }
|
|
|
1691
|
|
|
1692 return find_symbol_value_1 (sym, current_buffer, con, 1,
|
|
|
1693 find_it_p ? symbol_cons : Qnil,
|
|
|
1694 find_it_p);
|
|
|
1695 }
|
|
|
1696
|
|
|
1697 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /*
|
|
|
1698 Return SYMBOL's value. Error if that is void.
|
|
|
1699 */
|
|
|
1700 (symbol))
|
|
|
1701 {
|
|
|
1702 Lisp_Object val = find_symbol_value (symbol);
|
|
|
1703
|
|
|
1704 if (UNBOUNDP (val))
|
|
|
1705 return Fsignal (Qvoid_variable, list1 (symbol));
|
|
|
1706 else
|
|
|
1707 return val;
|
|
|
1708 }
|
|
|
1709
|
|
|
1710 DEFUN ("set", Fset, 2, 2, 0, /*
|
|
|
1711 Set SYMBOL's value to NEWVAL, and return NEWVAL.
|
|
|
1712 */
|
|
|
1713 (symbol, newval))
|
|
|
1714 {
|
|
|
1715 REGISTER Lisp_Object valcontents;
|
|
440
|
1716 Lisp_Symbol *sym;
|
|
428
|
1717 /* remember, we're called by Fmakunbound() as well */
|
|
|
1718
|
|
|
1719 CHECK_SYMBOL (symbol);
|
|
|
1720
|
|
|
1721 retry:
|
|
|
1722 sym = XSYMBOL (symbol);
|
|
|
1723 valcontents = sym->value;
|
|
|
1724
|
|
|
1725 if (EQ (symbol, Qnil) ||
|
|
|
1726 EQ (symbol, Qt) ||
|
|
|
1727 SYMBOL_IS_KEYWORD (symbol))
|
|
|
1728 reject_constant_symbols (symbol, newval, 0,
|
|
|
1729 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1730
|
|
|
1731 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents))
|
|
|
1732 {
|
|
|
1733 sym->value = newval;
|
|
|
1734 return newval;
|
|
|
1735 }
|
|
|
1736
|
|
|
1737 reject_constant_symbols (symbol, newval, 0,
|
|
|
1738 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1739
|
|
|
1740 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1741 {
|
|
|
1742 case SYMVAL_LISP_MAGIC:
|
|
|
1743 {
|
|
|
1744 if (UNBOUNDP (newval))
|
|
440
|
1745 {
|
|
|
1746 maybe_call_magic_handler (symbol, Qmakunbound, 0);
|
|
|
1747 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = Qunbound;
|
|
|
1748 }
|
|
428
|
1749 else
|
|
440
|
1750 {
|
|
|
1751 maybe_call_magic_handler (symbol, Qset, 1, newval);
|
|
|
1752 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = newval;
|
|
|
1753 }
|
|
428
|
1754 }
|
|
|
1755
|
|
|
1756 case SYMVAL_VARALIAS:
|
|
|
1757 symbol = follow_varalias_pointers (symbol,
|
|
|
1758 UNBOUNDP (newval)
|
|
|
1759 ? Qmakunbound : Qset);
|
|
|
1760 /* presto change-o! */
|
|
|
1761 goto retry;
|
|
|
1762
|
|
|
1763 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1764 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1765 case SYMVAL_OBJECT_FORWARD:
|
|
|
1766 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1767 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1768 if (UNBOUNDP (newval))
|
|
563
|
1769 invalid_change ("Cannot makunbound", symbol);
|
|
428
|
1770 break;
|
|
|
1771
|
|
|
1772 /* case SYMVAL_UNBOUND_MARKER: break; */
|
|
|
1773
|
|
|
1774 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1775 {
|
|
442
|
1776 const struct symbol_value_forward *fwd
|
|
428
|
1777 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1778 int mask = XINT (*((Lisp_Object *)
|
|
|
1779 symbol_value_forward_forward (fwd)));
|
|
|
1780 if (mask > 0)
|
|
|
1781 /* Setting this variable makes it buffer-local */
|
|
|
1782 current_buffer->local_var_flags |= mask;
|
|
|
1783 break;
|
|
|
1784 }
|
|
|
1785
|
|
|
1786 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1787 {
|
|
442
|
1788 const struct symbol_value_forward *fwd
|
|
428
|
1789 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1790 int mask = XINT (*((Lisp_Object *)
|
|
|
1791 symbol_value_forward_forward (fwd)));
|
|
|
1792 if (mask > 0)
|
|
|
1793 /* Setting this variable makes it console-local */
|
|
|
1794 XCONSOLE (Vselected_console)->local_var_flags |= mask;
|
|
|
1795 break;
|
|
|
1796 }
|
|
|
1797
|
|
|
1798 case SYMVAL_BUFFER_LOCAL:
|
|
|
1799 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1800 {
|
|
|
1801 /* If we want to examine or set the value and
|
|
|
1802 CURRENT-BUFFER is current, we just examine or set
|
|
|
1803 CURRENT-VALUE. If CURRENT-BUFFER is not current, we
|
|
|
1804 store the current CURRENT-VALUE value into
|
|
|
1805 CURRENT-ALIST- ELEMENT, then find the appropriate alist
|
|
|
1806 element for the buffer now current and set up
|
|
|
1807 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out
|
|
|
1808 of that element, and store into CURRENT-BUFFER.
|
|
|
1809
|
|
|
1810 If we are setting the variable and the current buffer does
|
|
|
1811 not have an alist entry for this variable, an alist entry is
|
|
|
1812 created.
|
|
|
1813
|
|
|
1814 Note that CURRENT-VALUE can be a forwarding pointer.
|
|
|
1815 Each time it is examined or set, forwarding must be
|
|
|
1816 done. */
|
|
|
1817 struct symbol_value_buffer_local *bfwd
|
|
|
1818 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1819 int some_buffer_local_p =
|
|
|
1820 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
1821 /* What value are we caching right now? */
|
|
|
1822 Lisp_Object aelt = bfwd->current_alist_element;
|
|
|
1823
|
|
|
1824 if (!NILP (bfwd->current_buffer) &&
|
|
|
1825 current_buffer == XBUFFER (bfwd->current_buffer)
|
|
|
1826 && ((some_buffer_local_p)
|
|
|
1827 ? 1 /* doesn't automatically become local */
|
|
|
1828 : !NILP (aelt) /* already local */
|
|
|
1829 ))
|
|
|
1830 {
|
|
|
1831 /* Cache is valid */
|
|
|
1832 valcontents = bfwd->current_value;
|
|
|
1833 }
|
|
|
1834 else
|
|
|
1835 {
|
|
|
1836 /* If the current buffer is not the buffer whose binding is
|
|
|
1837 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and
|
|
|
1838 we're looking at the default value, the cache is invalid; we
|
|
|
1839 need to write it out, and find the new CURRENT-ALIST-ELEMENT
|
|
|
1840 */
|
|
|
1841
|
|
|
1842 /* Write out the cached value for the old buffer; copy it
|
|
|
1843 back to its alist element. This works if the current
|
|
|
1844 buffer only sees the default value, too. */
|
|
|
1845 write_out_buffer_local_cache (symbol, bfwd);
|
|
|
1846
|
|
|
1847 /* Find the new value for CURRENT-ALIST-ELEMENT. */
|
|
|
1848 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd);
|
|
|
1849 if (NILP (aelt))
|
|
|
1850 {
|
|
|
1851 /* This buffer is still seeing the default value. */
|
|
|
1852 if (!some_buffer_local_p)
|
|
|
1853 {
|
|
|
1854 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a
|
|
|
1855 new assoc for a local value and set
|
|
|
1856 CURRENT-ALIST-ELEMENT to point to that. */
|
|
|
1857 aelt =
|
|
|
1858 do_symval_forwarding (bfwd->current_value,
|
|
|
1859 current_buffer,
|
|
|
1860 XCONSOLE (Vselected_console));
|
|
|
1861 aelt = Fcons (symbol, aelt);
|
|
|
1862 current_buffer->local_var_alist
|
|
|
1863 = Fcons (aelt, current_buffer->local_var_alist);
|
|
|
1864 }
|
|
|
1865 else
|
|
|
1866 {
|
|
|
1867 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL,
|
|
|
1868 we're currently seeing the default value. */
|
|
|
1869 ;
|
|
|
1870 }
|
|
|
1871 }
|
|
|
1872 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */
|
|
|
1873 bfwd->current_alist_element = aelt;
|
|
|
1874 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */
|
|
793
|
1875 bfwd->current_buffer = wrap_buffer (current_buffer);
|
|
428
|
1876 valcontents = bfwd->current_value;
|
|
|
1877 }
|
|
|
1878 break;
|
|
|
1879 }
|
|
|
1880 default:
|
|
|
1881 abort ();
|
|
|
1882 }
|
|
|
1883 store_symval_forwarding (symbol, valcontents, newval);
|
|
|
1884
|
|
|
1885 return newval;
|
|
|
1886 }
|
|
|
1887
|
|
|
1888
|
|
|
1889 /* Access or set a buffer-local symbol's default value. */
|
|
|
1890
|
|
|
1891 /* Return the default value of SYM, but don't check for voidness.
|
|
|
1892 Return Qunbound if it is void. */
|
|
|
1893
|
|
|
1894 static Lisp_Object
|
|
|
1895 default_value (Lisp_Object sym)
|
|
|
1896 {
|
|
|
1897 Lisp_Object valcontents;
|
|
|
1898
|
|
|
1899 CHECK_SYMBOL (sym);
|
|
|
1900
|
|
|
1901 retry:
|
|
|
1902 valcontents = XSYMBOL (sym)->value;
|
|
|
1903
|
|
|
1904 retry_2:
|
|
|
1905 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1906 return valcontents;
|
|
|
1907
|
|
|
1908 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1909 {
|
|
|
1910 case SYMVAL_LISP_MAGIC:
|
|
|
1911 /* #### kludge */
|
|
|
1912 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1913 /* semi-change-o */
|
|
|
1914 goto retry_2;
|
|
|
1915
|
|
|
1916 case SYMVAL_VARALIAS:
|
|
|
1917 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1918 /* presto change-o! */
|
|
|
1919 goto retry;
|
|
|
1920
|
|
|
1921 case SYMVAL_UNBOUND_MARKER:
|
|
|
1922 return valcontents;
|
|
|
1923
|
|
|
1924 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1925 {
|
|
442
|
1926 const struct symbol_value_forward *fwd
|
|
428
|
1927 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1928 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1929 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1930 - (char *)&buffer_local_flags))));
|
|
|
1931 }
|
|
|
1932
|
|
|
1933 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1934 {
|
|
442
|
1935 const struct symbol_value_forward *fwd
|
|
428
|
1936 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1937 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1938 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1939 - (char *)&console_local_flags))));
|
|
|
1940 }
|
|
|
1941
|
|
|
1942 case SYMVAL_BUFFER_LOCAL:
|
|
|
1943 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1944 {
|
|
|
1945 struct symbol_value_buffer_local *bfwd =
|
|
|
1946 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1947
|
|
|
1948 /* Handle user-created local variables. */
|
|
|
1949 /* If var is set up for a buffer that lacks a local value for it,
|
|
|
1950 the current value is nominally the default value.
|
|
|
1951 But the current value slot may be more up to date, since
|
|
|
1952 ordinary setq stores just that slot. So use that. */
|
|
|
1953 if (NILP (bfwd->current_alist_element))
|
|
|
1954 return do_symval_forwarding (bfwd->current_value, current_buffer,
|
|
|
1955 XCONSOLE (Vselected_console));
|
|
|
1956 else
|
|
|
1957 return bfwd->default_value;
|
|
|
1958 }
|
|
|
1959 default:
|
|
|
1960 /* For other variables, get the current value. */
|
|
|
1961 return do_symval_forwarding (valcontents, current_buffer,
|
|
|
1962 XCONSOLE (Vselected_console));
|
|
|
1963 }
|
|
|
1964
|
|
|
1965 RETURN_NOT_REACHED (Qnil) /* suppress compiler warning */
|
|
|
1966 }
|
|
|
1967
|
|
|
1968 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /*
|
|
|
1969 Return t if SYMBOL has a non-void default value.
|
|
|
1970 This is the value that is seen in buffers that do not have their own values
|
|
|
1971 for this variable.
|
|
|
1972 */
|
|
|
1973 (symbol))
|
|
|
1974 {
|
|
|
1975 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt;
|
|
|
1976 }
|
|
|
1977
|
|
|
1978 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /*
|
|
|
1979 Return SYMBOL's default value.
|
|
|
1980 This is the value that is seen in buffers that do not have their own values
|
|
|
1981 for this variable. The default value is meaningful for variables with
|
|
|
1982 local bindings in certain buffers.
|
|
|
1983 */
|
|
|
1984 (symbol))
|
|
|
1985 {
|
|
|
1986 Lisp_Object value = default_value (symbol);
|
|
|
1987
|
|
|
1988 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value;
|
|
|
1989 }
|
|
|
1990
|
|
|
1991 DEFUN ("set-default", Fset_default, 2, 2, 0, /*
|
|
444
|
1992 Set SYMBOL's default value to VALUE. SYMBOL and VALUE are evaluated.
|
|
428
|
1993 The default value is seen in buffers that do not have their own values
|
|
|
1994 for this variable.
|
|
|
1995 */
|
|
|
1996 (symbol, value))
|
|
|
1997 {
|
|
|
1998 Lisp_Object valcontents;
|
|
|
1999
|
|
|
2000 CHECK_SYMBOL (symbol);
|
|
|
2001
|
|
|
2002 retry:
|
|
|
2003 valcontents = XSYMBOL (symbol)->value;
|
|
|
2004
|
|
|
2005 retry_2:
|
|
|
2006 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2007 return Fset (symbol, value);
|
|
|
2008
|
|
|
2009 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2010 {
|
|
|
2011 case SYMVAL_LISP_MAGIC:
|
|
|
2012 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1,
|
|
|
2013 value));
|
|
|
2014 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2015 /* semi-change-o */
|
|
|
2016 goto retry_2;
|
|
|
2017
|
|
|
2018 case SYMVAL_VARALIAS:
|
|
|
2019 symbol = follow_varalias_pointers (symbol, Qset_default);
|
|
|
2020 /* presto change-o! */
|
|
|
2021 goto retry;
|
|
|
2022
|
|
|
2023 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2024 set_default_buffer_slot_variable (symbol, value);
|
|
|
2025 return value;
|
|
|
2026
|
|
|
2027 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
2028 set_default_console_slot_variable (symbol, value);
|
|
|
2029 return value;
|
|
|
2030
|
|
|
2031 case SYMVAL_BUFFER_LOCAL:
|
|
|
2032 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2033 {
|
|
|
2034 /* Store new value into the DEFAULT-VALUE slot */
|
|
|
2035 struct symbol_value_buffer_local *bfwd
|
|
|
2036 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2037
|
|
|
2038 bfwd->default_value = value;
|
|
|
2039 /* If current-buffer doesn't shadow default_value,
|
|
|
2040 * we must set the CURRENT-VALUE slot too */
|
|
|
2041 if (NILP (bfwd->current_alist_element))
|
|
|
2042 store_symval_forwarding (symbol, bfwd->current_value, value);
|
|
|
2043 return value;
|
|
|
2044 }
|
|
|
2045
|
|
|
2046 default:
|
|
|
2047 return Fset (symbol, value);
|
|
|
2048 }
|
|
|
2049 }
|
|
|
2050
|
|
|
2051 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /*
|
|
|
2052 Set the default value of variable SYMBOL to VALUE.
|
|
|
2053 SYMBOL, the variable name, is literal (not evaluated);
|
|
|
2054 VALUE is an expression and it is evaluated.
|
|
|
2055 The default value of a variable is seen in buffers
|
|
|
2056 that do not have their own values for the variable.
|
|
|
2057
|
|
|
2058 More generally, you can use multiple variables and values, as in
|
|
|
2059 (setq-default SYMBOL VALUE SYMBOL VALUE...)
|
|
|
2060 This sets each SYMBOL's default value to the corresponding VALUE.
|
|
|
2061 The VALUE for the Nth SYMBOL can refer to the new default values
|
|
|
2062 of previous SYMBOLs.
|
|
|
2063 */
|
|
|
2064 (args))
|
|
|
2065 {
|
|
|
2066 /* This function can GC */
|
|
|
2067 Lisp_Object symbol, tail, val = Qnil;
|
|
|
2068 int nargs;
|
|
|
2069 struct gcpro gcpro1;
|
|
|
2070
|
|
|
2071 GET_LIST_LENGTH (args, nargs);
|
|
|
2072
|
|
|
2073 if (nargs & 1) /* Odd number of arguments? */
|
|
|
2074 Fsignal (Qwrong_number_of_arguments,
|
|
|
2075 list2 (Qsetq_default, make_int (nargs)));
|
|
|
2076
|
|
|
2077 GCPRO1 (val);
|
|
|
2078
|
|
|
2079 PROPERTY_LIST_LOOP (tail, symbol, val, args)
|
|
|
2080 {
|
|
|
2081 val = Feval (val);
|
|
|
2082 Fset_default (symbol, val);
|
|
|
2083 }
|
|
|
2084
|
|
|
2085 UNGCPRO;
|
|
|
2086 return val;
|
|
|
2087 }
|
|
|
2088
|
|
|
2089 /* Lisp functions for creating and removing buffer-local variables. */
|
|
|
2090
|
|
|
2091 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1,
|
|
|
2092 "vMake Variable Buffer Local: ", /*
|
|
|
2093 Make VARIABLE have a separate value for each buffer.
|
|
|
2094 At any time, the value for the current buffer is in effect.
|
|
|
2095 There is also a default value which is seen in any buffer which has not yet
|
|
|
2096 set its own value.
|
|
|
2097 Using `set' or `setq' to set the variable causes it to have a separate value
|
|
|
2098 for the current buffer if it was previously using the default value.
|
|
|
2099 The function `default-value' gets the default value and `set-default'
|
|
|
2100 sets it.
|
|
|
2101 */
|
|
|
2102 (variable))
|
|
|
2103 {
|
|
|
2104 Lisp_Object valcontents;
|
|
|
2105
|
|
|
2106 CHECK_SYMBOL (variable);
|
|
|
2107
|
|
|
2108 retry:
|
|
|
2109 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local);
|
|
|
2110
|
|
|
2111 valcontents = XSYMBOL (variable)->value;
|
|
|
2112
|
|
|
2113 retry_2:
|
|
|
2114 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2115 {
|
|
|
2116 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2117 {
|
|
|
2118 case SYMVAL_LISP_MAGIC:
|
|
|
2119 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2120 (variable, Qmake_variable_buffer_local, 0)))
|
|
|
2121 return variable;
|
|
|
2122 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2123 /* semi-change-o */
|
|
|
2124 goto retry_2;
|
|
|
2125
|
|
|
2126 case SYMVAL_VARALIAS:
|
|
|
2127 variable = follow_varalias_pointers (variable,
|
|
|
2128 Qmake_variable_buffer_local);
|
|
|
2129 /* presto change-o! */
|
|
|
2130 goto retry;
|
|
|
2131
|
|
|
2132 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2133 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2134 case SYMVAL_OBJECT_FORWARD:
|
|
|
2135 case SYMVAL_UNBOUND_MARKER:
|
|
|
2136 break;
|
|
|
2137
|
|
|
2138 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2139 case SYMVAL_BUFFER_LOCAL:
|
|
|
2140 /* Already per-each-buffer */
|
|
|
2141 return variable;
|
|
|
2142
|
|
|
2143 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2144 /* Transmogrify */
|
|
|
2145 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type =
|
|
|
2146 SYMVAL_BUFFER_LOCAL;
|
|
|
2147 return variable;
|
|
|
2148
|
|
|
2149 default:
|
|
|
2150 abort ();
|
|
|
2151 }
|
|
|
2152 }
|
|
|
2153
|
|
|
2154 {
|
|
|
2155 struct symbol_value_buffer_local *bfwd
|
|
|
2156 = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
|
2157 &lrecord_symbol_value_buffer_local);
|
|
|
2158 Lisp_Object foo;
|
|
452
|
2159 zero_lcrecord (&bfwd->magic);
|
|
428
|
2160 bfwd->magic.type = SYMVAL_BUFFER_LOCAL;
|
|
|
2161
|
|
|
2162 bfwd->default_value = find_symbol_value (variable);
|
|
|
2163 bfwd->current_value = valcontents;
|
|
|
2164 bfwd->current_alist_element = Qnil;
|
|
|
2165 bfwd->current_buffer = Fcurrent_buffer ();
|
|
793
|
2166 foo = wrap_symbol_value_magic (bfwd);
|
|
428
|
2167 *value_slot_past_magic (variable) = foo;
|
|
|
2168 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/
|
|
|
2169 /* This sets the default-value of any make-variable-buffer-local to nil.
|
|
|
2170 That just sucks. User can just use setq-default to effect that,
|
|
|
2171 but there's no way to do makunbound-default to undo this lossage. */
|
|
|
2172 if (UNBOUNDP (valcontents))
|
|
|
2173 bfwd->default_value = Qnil;
|
|
|
2174 #endif
|
|
|
2175 #if 0 /* #### Yuck! */
|
|
|
2176 /* This sets the value to nil in this buffer.
|
|
|
2177 User could use (setq variable nil) to do this.
|
|
|
2178 It isn't as egregious to do this automatically
|
|
|
2179 as it is to do so to the default-value, but it's
|
|
|
2180 still really dubious. */
|
|
|
2181 if (UNBOUNDP (valcontents))
|
|
|
2182 Fset (variable, Qnil);
|
|
|
2183 #endif
|
|
|
2184 return variable;
|
|
|
2185 }
|
|
|
2186 }
|
|
|
2187
|
|
|
2188 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1,
|
|
|
2189 "vMake Local Variable: ", /*
|
|
|
2190 Make VARIABLE have a separate value in the current buffer.
|
|
|
2191 Other buffers will continue to share a common default value.
|
|
|
2192 \(The buffer-local value of VARIABLE starts out as the same value
|
|
|
2193 VARIABLE previously had. If VARIABLE was void, it remains void.)
|
|
|
2194 See also `make-variable-buffer-local'.
|
|
|
2195
|
|
|
2196 If the variable is already arranged to become local when set,
|
|
|
2197 this function causes a local value to exist for this buffer,
|
|
|
2198 just as setting the variable would do.
|
|
|
2199
|
|
|
2200 Do not use `make-local-variable' to make a hook variable buffer-local.
|
|
|
2201 Use `make-local-hook' instead.
|
|
|
2202 */
|
|
|
2203 (variable))
|
|
|
2204 {
|
|
|
2205 Lisp_Object valcontents;
|
|
|
2206 struct symbol_value_buffer_local *bfwd;
|
|
|
2207
|
|
|
2208 CHECK_SYMBOL (variable);
|
|
|
2209
|
|
|
2210 retry:
|
|
|
2211 verify_ok_for_buffer_local (variable, Qmake_local_variable);
|
|
|
2212
|
|
|
2213 valcontents = XSYMBOL (variable)->value;
|
|
|
2214
|
|
|
2215 retry_2:
|
|
|
2216 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2217 {
|
|
|
2218 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2219 {
|
|
|
2220 case SYMVAL_LISP_MAGIC:
|
|
|
2221 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2222 (variable, Qmake_local_variable, 0)))
|
|
|
2223 return variable;
|
|
|
2224 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2225 /* semi-change-o */
|
|
|
2226 goto retry_2;
|
|
|
2227
|
|
|
2228 case SYMVAL_VARALIAS:
|
|
|
2229 variable = follow_varalias_pointers (variable, Qmake_local_variable);
|
|
|
2230 /* presto change-o! */
|
|
|
2231 goto retry;
|
|
|
2232
|
|
|
2233 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2234 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2235 case SYMVAL_OBJECT_FORWARD:
|
|
|
2236 case SYMVAL_UNBOUND_MARKER:
|
|
|
2237 break;
|
|
|
2238
|
|
|
2239 case SYMVAL_BUFFER_LOCAL:
|
|
|
2240 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2241 {
|
|
|
2242 /* Make sure the symbol has a local value in this particular
|
|
|
2243 buffer, by setting it to the same value it already has. */
|
|
|
2244 Fset (variable, find_symbol_value (variable));
|
|
|
2245 return variable;
|
|
|
2246 }
|
|
|
2247
|
|
|
2248 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2249 {
|
|
|
2250 if (!NILP (buffer_local_alist_element (current_buffer,
|
|
|
2251 variable,
|
|
|
2252 (XSYMBOL_VALUE_BUFFER_LOCAL
|
|
|
2253 (valcontents)))))
|
|
|
2254 goto already_local_to_current_buffer;
|
|
|
2255 else
|
|
|
2256 goto already_local_to_some_other_buffer;
|
|
|
2257 }
|
|
|
2258
|
|
|
2259 default:
|
|
|
2260 abort ();
|
|
|
2261 }
|
|
|
2262 }
|
|
|
2263
|
|
|
2264 /* Make sure variable is set up to hold per-buffer values */
|
|
|
2265 bfwd = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
|
2266 &lrecord_symbol_value_buffer_local);
|
|
452
|
2267 zero_lcrecord (&bfwd->magic);
|
|
428
|
2268 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL;
|
|
|
2269
|
|
|
2270 bfwd->current_buffer = Qnil;
|
|
|
2271 bfwd->current_alist_element = Qnil;
|
|
|
2272 bfwd->current_value = valcontents;
|
|
|
2273 /* passing 0 is OK because this should never be a
|
|
|
2274 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD
|
|
|
2275 variable. */
|
|
|
2276 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0);
|
|
|
2277
|
|
|
2278 #if 0
|
|
|
2279 if (UNBOUNDP (bfwd->default_value))
|
|
|
2280 bfwd->default_value = Qnil; /* Yuck! */
|
|
|
2281 #endif
|
|
|
2282
|
|
793
|
2283 valcontents = wrap_symbol_value_magic (bfwd);
|
|
428
|
2284 *value_slot_past_magic (variable) = valcontents;
|
|
|
2285
|
|
|
2286 already_local_to_some_other_buffer:
|
|
|
2287
|
|
|
2288 /* Make sure this buffer has its own value of variable */
|
|
|
2289 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2290
|
|
|
2291 if (UNBOUNDP (bfwd->default_value))
|
|
|
2292 {
|
|
|
2293 /* If default value is unbound, set local value to nil. */
|
|
793
|
2294 bfwd->current_buffer = wrap_buffer (current_buffer);
|
|
428
|
2295 bfwd->current_alist_element = Fcons (variable, Qnil);
|
|
|
2296 current_buffer->local_var_alist =
|
|
|
2297 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist);
|
|
|
2298 store_symval_forwarding (variable, bfwd->current_value, Qnil);
|
|
|
2299 return variable;
|
|
|
2300 }
|
|
|
2301
|
|
|
2302 current_buffer->local_var_alist
|
|
|
2303 = Fcons (Fcons (variable, bfwd->default_value),
|
|
|
2304 current_buffer->local_var_alist);
|
|
|
2305
|
|
|
2306 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2307 force it to look once again for this buffer's value */
|
|
|
2308 if (!NILP (bfwd->current_buffer) &&
|
|
|
2309 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2310 bfwd->current_buffer = Qnil;
|
|
|
2311
|
|
|
2312 already_local_to_current_buffer:
|
|
|
2313
|
|
|
2314 /* If the symbol forwards into a C variable, then swap in the
|
|
|
2315 variable for this buffer immediately. If C code modifies the
|
|
|
2316 variable before we swap in, then that new value will clobber the
|
|
|
2317 default value the next time we swap. */
|
|
|
2318 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2319 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value))
|
|
|
2320 {
|
|
|
2321 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value))
|
|
|
2322 {
|
|
|
2323 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2324 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2325 case SYMVAL_OBJECT_FORWARD:
|
|
|
2326 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
2327 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
|
2328 break;
|
|
|
2329
|
|
|
2330 case SYMVAL_UNBOUND_MARKER:
|
|
|
2331 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2332 break;
|
|
|
2333
|
|
|
2334 default:
|
|
|
2335 abort ();
|
|
|
2336 }
|
|
|
2337 }
|
|
|
2338
|
|
|
2339 return variable;
|
|
|
2340 }
|
|
|
2341
|
|
|
2342 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1,
|
|
|
2343 "vKill Local Variable: ", /*
|
|
|
2344 Make VARIABLE no longer have a separate value in the current buffer.
|
|
|
2345 From now on the default value will apply in this buffer.
|
|
|
2346 */
|
|
|
2347 (variable))
|
|
|
2348 {
|
|
|
2349 Lisp_Object valcontents;
|
|
|
2350
|
|
|
2351 CHECK_SYMBOL (variable);
|
|
|
2352
|
|
|
2353 retry:
|
|
|
2354 valcontents = XSYMBOL (variable)->value;
|
|
|
2355
|
|
|
2356 retry_2:
|
|
|
2357 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2358 return variable;
|
|
|
2359
|
|
|
2360 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2361 {
|
|
|
2362 case SYMVAL_LISP_MAGIC:
|
|
|
2363 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2364 (variable, Qkill_local_variable, 0)))
|
|
|
2365 return variable;
|
|
|
2366 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2367 /* semi-change-o */
|
|
|
2368 goto retry_2;
|
|
|
2369
|
|
|
2370 case SYMVAL_VARALIAS:
|
|
|
2371 variable = follow_varalias_pointers (variable, Qkill_local_variable);
|
|
|
2372 /* presto change-o! */
|
|
|
2373 goto retry;
|
|
|
2374
|
|
|
2375 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2376 {
|
|
442
|
2377 const struct symbol_value_forward *fwd
|
|
428
|
2378 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2379 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
2380 - (char *) &buffer_local_flags);
|
|
|
2381 int mask =
|
|
|
2382 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2383
|
|
|
2384 if (mask > 0)
|
|
|
2385 {
|
|
|
2386 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2387 Lisp_Object in_object, int flags) =
|
|
|
2388 symbol_value_forward_magicfun (fwd);
|
|
|
2389 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2390 (offset + (char *) XBUFFER (Vbuffer_defaults));
|
|
|
2391 if (magicfun)
|
|
771
|
2392 (magicfun) (variable, &oldval, wrap_buffer (current_buffer), 0);
|
|
428
|
2393 *(Lisp_Object *) (offset + (char *) current_buffer)
|
|
|
2394 = oldval;
|
|
|
2395 current_buffer->local_var_flags &= ~mask;
|
|
|
2396 }
|
|
|
2397 return variable;
|
|
|
2398 }
|
|
|
2399
|
|
|
2400 case SYMVAL_BUFFER_LOCAL:
|
|
|
2401 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2402 {
|
|
|
2403 /* Get rid of this buffer's alist element, if any */
|
|
|
2404 struct symbol_value_buffer_local *bfwd
|
|
|
2405 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2406 Lisp_Object alist = current_buffer->local_var_alist;
|
|
|
2407 Lisp_Object alist_element
|
|
|
2408 = buffer_local_alist_element (current_buffer, variable, bfwd);
|
|
|
2409
|
|
|
2410 if (!NILP (alist_element))
|
|
|
2411 current_buffer->local_var_alist = Fdelq (alist_element, alist);
|
|
|
2412
|
|
|
2413 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2414 force it to look once again for this buffer's value */
|
|
|
2415 if (!NILP (bfwd->current_buffer) &&
|
|
|
2416 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2417 bfwd->current_buffer = Qnil;
|
|
|
2418
|
|
|
2419 /* We just changed the value in the current_buffer. If this
|
|
|
2420 variable forwards to a C variable, we need to change the
|
|
|
2421 value of the C variable. set_up_buffer_local_cache()
|
|
|
2422 will do this. It doesn't hurt to do it always,
|
|
|
2423 so just go ahead and do that. */
|
|
|
2424 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
|
2425 }
|
|
|
2426 return variable;
|
|
|
2427
|
|
|
2428 default:
|
|
|
2429 return variable;
|
|
|
2430 }
|
|
|
2431 RETURN_NOT_REACHED(Qnil) /* suppress compiler warning */
|
|
|
2432 }
|
|
|
2433
|
|
|
2434
|
|
|
2435 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1,
|
|
|
2436 "vKill Console Local Variable: ", /*
|
|
|
2437 Make VARIABLE no longer have a separate value in the selected console.
|
|
|
2438 From now on the default value will apply in this console.
|
|
|
2439 */
|
|
|
2440 (variable))
|
|
|
2441 {
|
|
|
2442 Lisp_Object valcontents;
|
|
|
2443
|
|
|
2444 CHECK_SYMBOL (variable);
|
|
|
2445
|
|
|
2446 retry:
|
|
|
2447 valcontents = XSYMBOL (variable)->value;
|
|
|
2448
|
|
|
2449 retry_2:
|
|
|
2450 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2451 return variable;
|
|
|
2452
|
|
|
2453 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2454 {
|
|
|
2455 case SYMVAL_LISP_MAGIC:
|
|
|
2456 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2457 (variable, Qkill_console_local_variable, 0)))
|
|
|
2458 return variable;
|
|
|
2459 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2460 /* semi-change-o */
|
|
|
2461 goto retry_2;
|
|
|
2462
|
|
|
2463 case SYMVAL_VARALIAS:
|
|
|
2464 variable = follow_varalias_pointers (variable,
|
|
|
2465 Qkill_console_local_variable);
|
|
|
2466 /* presto change-o! */
|
|
|
2467 goto retry;
|
|
|
2468
|
|
|
2469 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
2470 {
|
|
442
|
2471 const struct symbol_value_forward *fwd
|
|
428
|
2472 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2473 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
2474 - (char *) &console_local_flags);
|
|
|
2475 int mask =
|
|
|
2476 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2477
|
|
|
2478 if (mask > 0)
|
|
|
2479 {
|
|
|
2480 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2481 Lisp_Object in_object, int flags) =
|
|
|
2482 symbol_value_forward_magicfun (fwd);
|
|
|
2483 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2484 (offset + (char *) XCONSOLE (Vconsole_defaults));
|
|
|
2485 if (magicfun)
|
|
|
2486 magicfun (variable, &oldval, Vselected_console, 0);
|
|
|
2487 *(Lisp_Object *) (offset + (char *) XCONSOLE (Vselected_console))
|
|
|
2488 = oldval;
|
|
|
2489 XCONSOLE (Vselected_console)->local_var_flags &= ~mask;
|
|
|
2490 }
|
|
|
2491 return variable;
|
|
|
2492 }
|
|
|
2493
|
|
|
2494 default:
|
|
|
2495 return variable;
|
|
|
2496 }
|
|
|
2497 }
|
|
|
2498
|
|
|
2499 /* Used by specbind to determine what effects it might have. Returns:
|
|
|
2500 * 0 if symbol isn't buffer-local, and wouldn't be after it is set
|
|
|
2501 * <0 if symbol isn't presently buffer-local, but set would make it so
|
|
|
2502 * >0 if symbol is presently buffer-local
|
|
|
2503 */
|
|
|
2504 int
|
|
|
2505 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer)
|
|
|
2506 {
|
|
|
2507 Lisp_Object valcontents;
|
|
|
2508
|
|
|
2509 retry:
|
|
|
2510 valcontents = XSYMBOL (symbol)->value;
|
|
|
2511
|
|
|
2512 retry_2:
|
|
|
2513 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2514 {
|
|
|
2515 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2516 {
|
|
|
2517 case SYMVAL_LISP_MAGIC:
|
|
|
2518 /* #### kludge */
|
|
|
2519 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2520 /* semi-change-o */
|
|
|
2521 goto retry_2;
|
|
|
2522
|
|
|
2523 case SYMVAL_VARALIAS:
|
|
|
2524 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */);
|
|
|
2525 /* presto change-o! */
|
|
|
2526 goto retry;
|
|
|
2527
|
|
|
2528 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2529 {
|
|
442
|
2530 const struct symbol_value_forward *fwd
|
|
428
|
2531 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2532 int mask = XINT (*((Lisp_Object *)
|
|
|
2533 symbol_value_forward_forward (fwd)));
|
|
|
2534 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask)))
|
|
|
2535 /* Already buffer-local */
|
|
|
2536 return 1;
|
|
|
2537 else
|
|
|
2538 /* Would be buffer-local after set */
|
|
|
2539 return -1;
|
|
|
2540 }
|
|
|
2541 case SYMVAL_BUFFER_LOCAL:
|
|
|
2542 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2543 {
|
|
|
2544 struct symbol_value_buffer_local *bfwd
|
|
|
2545 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2546 if (buffer
|
|
|
2547 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd)))
|
|
|
2548 return 1;
|
|
|
2549 else
|
|
|
2550 /* Automatically becomes local when set */
|
|
|
2551 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0;
|
|
|
2552 }
|
|
|
2553 default:
|
|
|
2554 return 0;
|
|
|
2555 }
|
|
|
2556 }
|
|
|
2557 return 0;
|
|
|
2558 }
|
|
|
2559
|
|
|
2560
|
|
|
2561 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /*
|
|
|
2562 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound.
|
|
|
2563 */
|
|
|
2564 (symbol, buffer, unbound_value))
|
|
|
2565 {
|
|
|
2566 Lisp_Object value;
|
|
|
2567 CHECK_SYMBOL (symbol);
|
|
|
2568 CHECK_BUFFER (buffer);
|
|
|
2569 value = symbol_value_in_buffer (symbol, buffer);
|
|
|
2570 return UNBOUNDP (value) ? unbound_value : value;
|
|
|
2571 }
|
|
|
2572
|
|
|
2573 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /*
|
|
|
2574 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound.
|
|
|
2575 */
|
|
|
2576 (symbol, console, unbound_value))
|
|
|
2577 {
|
|
|
2578 Lisp_Object value;
|
|
|
2579 CHECK_SYMBOL (symbol);
|
|
|
2580 CHECK_CONSOLE (console);
|
|
|
2581 value = symbol_value_in_console (symbol, console);
|
|
|
2582 return UNBOUNDP (value) ? unbound_value : value;
|
|
|
2583 }
|
|
|
2584
|
|
|
2585 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /*
|
|
|
2586 If SYMBOL is a built-in variable, return info about this; else return nil.
|
|
|
2587 The returned info will be a symbol, one of
|
|
|
2588
|
|
|
2589 `object' A simple built-in variable.
|
|
|
2590 `const-object' Same, but cannot be set.
|
|
|
2591 `integer' A built-in integer variable.
|
|
|
2592 `const-integer' Same, but cannot be set.
|
|
|
2593 `boolean' A built-in boolean variable.
|
|
|
2594 `const-boolean' Same, but cannot be set.
|
|
|
2595 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'.
|
|
|
2596 `current-buffer' A built-in buffer-local variable.
|
|
|
2597 `const-current-buffer' Same, but cannot be set.
|
|
|
2598 `default-buffer' Forwards to the default value of a built-in
|
|
|
2599 buffer-local variable.
|
|
|
2600 `selected-console' A built-in console-local variable.
|
|
|
2601 `const-selected-console' Same, but cannot be set.
|
|
|
2602 `default-console' Forwards to the default value of a built-in
|
|
|
2603 console-local variable.
|
|
|
2604 */
|
|
|
2605 (symbol))
|
|
|
2606 {
|
|
|
2607 REGISTER Lisp_Object valcontents;
|
|
|
2608
|
|
|
2609 CHECK_SYMBOL (symbol);
|
|
|
2610
|
|
|
2611 retry:
|
|
|
2612 valcontents = XSYMBOL (symbol)->value;
|
|
|
2613
|
|
|
2614 retry_2:
|
|
|
2615 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2616 return Qnil;
|
|
|
2617
|
|
|
2618 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2619 {
|
|
|
2620 case SYMVAL_LISP_MAGIC:
|
|
|
2621 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2622 /* semi-change-o */
|
|
|
2623 goto retry_2;
|
|
|
2624
|
|
|
2625 case SYMVAL_VARALIAS:
|
|
|
2626 symbol = follow_varalias_pointers (symbol, Qt);
|
|
|
2627 /* presto change-o! */
|
|
|
2628 goto retry;
|
|
|
2629
|
|
|
2630 case SYMVAL_BUFFER_LOCAL:
|
|
|
2631 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2632 valcontents =
|
|
|
2633 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value;
|
|
|
2634 /* semi-change-o */
|
|
|
2635 goto retry_2;
|
|
|
2636
|
|
|
2637 case SYMVAL_FIXNUM_FORWARD: return Qinteger;
|
|
|
2638 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer;
|
|
|
2639 case SYMVAL_BOOLEAN_FORWARD: return Qboolean;
|
|
|
2640 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean;
|
|
|
2641 case SYMVAL_OBJECT_FORWARD: return Qobject;
|
|
|
2642 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object;
|
|
|
2643 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier;
|
|
|
2644 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer;
|
|
|
2645 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer;
|
|
|
2646 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer;
|
|
|
2647 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console;
|
|
|
2648 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console;
|
|
|
2649 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console;
|
|
|
2650 case SYMVAL_UNBOUND_MARKER: return Qnil;
|
|
|
2651
|
|
|
2652 default:
|
|
|
2653 abort (); return Qnil;
|
|
|
2654 }
|
|
|
2655 }
|
|
|
2656
|
|
|
2657
|
|
|
2658 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /*
|
|
|
2659 Return t if SYMBOL's value is local to BUFFER.
|
|
444
|
2660 If optional third arg AFTER-SET is non-nil, return t if SYMBOL would be
|
|
428
|
2661 buffer-local after it is set, regardless of whether it is so presently.
|
|
|
2662 A nil value for BUFFER is *not* the same as (current-buffer), but means
|
|
|
2663 "no buffer". Specifically:
|
|
|
2664
|
|
|
2665 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that
|
|
|
2666 the variable is one of the special built-in variables that is always
|
|
|
2667 buffer-local. (This includes `buffer-file-name', `buffer-read-only',
|
|
|
2668 `buffer-undo-list', and others.)
|
|
|
2669
|
|
|
2670 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that
|
|
|
2671 the variable has had `make-variable-buffer-local' applied to it.
|
|
|
2672 */
|
|
|
2673 (symbol, buffer, after_set))
|
|
|
2674 {
|
|
|
2675 int local_info;
|
|
|
2676
|
|
|
2677 CHECK_SYMBOL (symbol);
|
|
|
2678 if (!NILP (buffer))
|
|
|
2679 {
|
|
|
2680 buffer = get_buffer (buffer, 1);
|
|
|
2681 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer));
|
|
|
2682 }
|
|
|
2683 else
|
|
|
2684 {
|
|
|
2685 local_info = symbol_value_buffer_local_info (symbol, 0);
|
|
|
2686 }
|
|
|
2687
|
|
|
2688 if (NILP (after_set))
|
|
|
2689 return local_info > 0 ? Qt : Qnil;
|
|
|
2690 else
|
|
|
2691 return local_info != 0 ? Qt : Qnil;
|
|
|
2692 }
|
|
|
2693
|
|
|
2694
|
|
|
2695 /*
|
|
|
2696 I've gone ahead and partially implemented this because it's
|
|
|
2697 super-useful for dealing with the compatibility problems in supporting
|
|
|
2698 the old pointer-shape variables, and preventing people from `setq'ing
|
|
|
2699 the new variables. Any other way of handling this problem is way
|
|
|
2700 ugly, likely to be slow, and generally not something I want to waste
|
|
|
2701 my time worrying about.
|
|
|
2702
|
|
|
2703 The interface and/or function name is sure to change before this
|
|
|
2704 gets into its final form. I currently like the way everything is
|
|
|
2705 set up and it has all the features I want it to have, except for
|
|
|
2706 one: I really want to be able to have multiple nested handlers,
|
|
|
2707 to implement an `advice'-like capability. This would allow,
|
|
|
2708 for example, a clean way of implementing `debug-if-set' or
|
|
|
2709 `debug-if-referenced' and such.
|
|
|
2710
|
|
|
2711 NOTE NOTE NOTE NOTE NOTE NOTE NOTE:
|
|
|
2712 ************************************************************
|
|
|
2713 **Only** the `set-value', `make-unbound', and `make-local'
|
|
|
2714 handler types are currently implemented. Implementing the
|
|
|
2715 get-value and bound-predicate handlers is somewhat tricky
|
|
|
2716 because there are lots of subfunctions (e.g. find_symbol_value()).
|
|
|
2717 find_symbol_value(), in fact, is called from outside of
|
|
|
2718 this module. You'd have to have it do this:
|
|
|
2719
|
|
|
2720 -- check for a `bound-predicate' handler, call that if so;
|
|
|
2721 if it returns nil, return Qunbound
|
|
|
2722 -- check for a `get-value' handler and call it and return
|
|
|
2723 that value
|
|
|
2724
|
|
|
2725 It gets even trickier when you have to deal with
|
|
|
2726 sub-subfunctions like find_symbol_value_1(), and esp.
|
|
|
2727 when you have to properly handle variable aliases, which
|
|
|
2728 can lead to lots of tricky situations. So I've just
|
|
|
2729 punted on this, since the interface isn't officially
|
|
|
2730 exported and we can get by with just a `set-value'
|
|
|
2731 handler.
|
|
|
2732
|
|
|
2733 Actions in unimplemented handler types will correctly
|
|
|
2734 ignore any handlers, and will not fuck anything up or
|
|
|
2735 go awry.
|
|
|
2736
|
|
|
2737 WARNING WARNING: If you do go and implement another
|
|
|
2738 type of handler, make *sure* to change
|
|
|
2739 would_be_magic_handled() so it knows about this,
|
|
|
2740 or dire things could result.
|
|
|
2741 ************************************************************
|
|
|
2742 NOTE NOTE NOTE NOTE NOTE NOTE NOTE
|
|
|
2743
|
|
|
2744 Real documentation is as follows.
|
|
|
2745
|
|
|
2746 Set a magic handler for VARIABLE.
|
|
|
2747 This allows you to specify arbitrary behavior that results from
|
|
|
2748 accessing or setting a variable. For example, retrieving the
|
|
|
2749 variable's value might actually retrieve the first element off of
|
|
|
2750 a list stored in another variable, and setting the variable's value
|
|
|
2751 might add an element to the front of that list. (This is how the
|
|
|
2752 obsolete variable `unread-command-event' is implemented.)
|
|
|
2753
|
|
|
2754 In general it is NOT good programming practice to use magic variables
|
|
|
2755 in a new package that you are designing. If you feel the need to
|
|
|
2756 do this, it's almost certainly a sign that you should be using a
|
|
|
2757 function instead of a variable. This facility is provided to allow
|
|
|
2758 a package to support obsolete variables and provide compatibility
|
|
|
2759 with similar packages with different variable names and semantics.
|
|
|
2760 By using magic handlers, you can cleanly provide obsoleteness and
|
|
|
2761 compatibility support and separate this support from the core
|
|
|
2762 routines in a package.
|
|
|
2763
|
|
|
2764 VARIABLE should be a symbol naming the variable for which the
|
|
|
2765 magic behavior is provided. HANDLER-TYPE is a symbol specifying
|
|
|
2766 which behavior is being controlled, and HANDLER is the function
|
|
|
2767 that will be called to control this behavior. HARG is a
|
|
|
2768 value that will be passed to HANDLER but is otherwise
|
|
|
2769 uninterpreted. KEEP-EXISTING specifies what to do with existing
|
|
|
2770 handlers of the same type; nil means "erase them all", t means
|
|
|
2771 "keep them but insert at the beginning", the list (t) means
|
|
|
2772 "keep them but insert at the end", a function means "keep
|
|
|
2773 them but insert before the specified function", a list containing
|
|
|
2774 a function means "keep them but insert after the specified
|
|
|
2775 function".
|
|
|
2776
|
|
|
2777 You can specify magic behavior for any type of variable at all,
|
|
|
2778 and for any handler types that are unspecified, the standard
|
|
|
2779 behavior applies. This allows you, for example, to use
|
|
|
2780 `defvaralias' in conjunction with this function. (For that
|
|
|
2781 matter, `defvaralias' could be implemented using this function.)
|
|
|
2782
|
|
|
2783 The behaviors that can be specified in HANDLER-TYPE are
|
|
|
2784
|
|
|
2785 get-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2786 This means that one of the functions `symbol-value',
|
|
|
2787 `default-value', `symbol-value-in-buffer', or
|
|
|
2788 `symbol-value-in-console' was called on SYM.
|
|
|
2789
|
|
|
2790 set-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2791 This means that one of the functions `set' or `set-default'
|
|
|
2792 was called on SYM.
|
|
|
2793
|
|
|
2794 bound-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2795 This means that one of the functions `boundp', `globally-boundp',
|
|
|
2796 or `default-boundp' was called on SYM.
|
|
|
2797
|
|
|
2798 make-unbound (SYM ARGS FUN HARG HANDLERS)
|
|
|
2799 This means that the function `makunbound' was called on SYM.
|
|
|
2800
|
|
|
2801 local-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2802 This means that the function `local-variable-p' was called
|
|
|
2803 on SYM.
|
|
|
2804
|
|
|
2805 make-local (SYM ARGS FUN HARG HANDLERS)
|
|
|
2806 This means that one of the functions `make-local-variable',
|
|
|
2807 `make-variable-buffer-local', `kill-local-variable',
|
|
|
2808 or `kill-console-local-variable' was called on SYM.
|
|
|
2809
|
|
|
2810 The meanings of the arguments are as follows:
|
|
|
2811
|
|
|
2812 SYM is the symbol on which the function was called, and is always
|
|
|
2813 the first argument to the function.
|
|
|
2814
|
|
|
2815 ARGS are the remaining arguments in the original call (i.e. all
|
|
|
2816 but the first). In the case of `set-value' in particular,
|
|
|
2817 the first element of ARGS is the value to which the variable
|
|
|
2818 is being set. In some cases, ARGS is sanitized from what was
|
|
|
2819 actually given. For example, whenever `nil' is passed to an
|
|
|
2820 argument and it means `current-buffer', the current buffer is
|
|
|
2821 substituted instead.
|
|
|
2822
|
|
|
2823 FUN is a symbol indicating which function is being called.
|
|
|
2824 For many of the functions, you can determine the corresponding
|
|
|
2825 function of a different class using
|
|
|
2826 `symbol-function-corresponding-function'.
|
|
|
2827
|
|
|
2828 HARG is the argument that was given in the call
|
|
|
2829 to `set-symbol-value-handler' for SYM and HANDLER-TYPE.
|
|
|
2830
|
|
|
2831 HANDLERS is a structure containing the remaining handlers
|
|
|
2832 for the variable; to call one of them, use
|
|
|
2833 `chain-to-symbol-value-handler'.
|
|
|
2834
|
|
|
2835 NOTE: You may *not* modify the list in ARGS, and if you want to
|
|
|
2836 keep it around after the handler function exits, you must make
|
|
|
2837 a copy using `copy-sequence'. (Same caveats for HANDLERS also.)
|
|
|
2838 */
|
|
|
2839
|
|
|
2840 static enum lisp_magic_handler
|
|
|
2841 decode_magic_handler_type (Lisp_Object symbol)
|
|
|
2842 {
|
|
|
2843 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE;
|
|
|
2844 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE;
|
|
|
2845 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2846 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2847 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2848 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2849
|
|
563
|
2850 invalid_constant ("Unrecognized symbol value handler type", symbol);
|
|
801
|
2851 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX)
|
|
428
|
2852 }
|
|
|
2853
|
|
|
2854 static enum lisp_magic_handler
|
|
|
2855 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found)
|
|
|
2856 {
|
|
|
2857 if (EQ (funsym, Qsymbol_value)
|
|
|
2858 || EQ (funsym, Qdefault_value)
|
|
|
2859 || EQ (funsym, Qsymbol_value_in_buffer)
|
|
|
2860 || EQ (funsym, Qsymbol_value_in_console))
|
|
|
2861 return MAGIC_HANDLER_GET_VALUE;
|
|
|
2862
|
|
|
2863 if (EQ (funsym, Qset)
|
|
|
2864 || EQ (funsym, Qset_default))
|
|
|
2865 return MAGIC_HANDLER_SET_VALUE;
|
|
|
2866
|
|
|
2867 if (EQ (funsym, Qboundp)
|
|
|
2868 || EQ (funsym, Qglobally_boundp)
|
|
|
2869 || EQ (funsym, Qdefault_boundp))
|
|
|
2870 return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2871
|
|
|
2872 if (EQ (funsym, Qmakunbound))
|
|
|
2873 return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2874
|
|
|
2875 if (EQ (funsym, Qlocal_variable_p))
|
|
|
2876 return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2877
|
|
|
2878 if (EQ (funsym, Qmake_variable_buffer_local)
|
|
|
2879 || EQ (funsym, Qmake_local_variable))
|
|
|
2880 return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2881
|
|
|
2882 if (abort_if_not_found)
|
|
|
2883 abort ();
|
|
563
|
2884 invalid_argument ("Unrecognized symbol-value function", funsym);
|
|
801
|
2885 RETURN_NOT_REACHED (MAGIC_HANDLER_MAX)
|
|
428
|
2886 }
|
|
|
2887
|
|
|
2888 static int
|
|
|
2889 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym)
|
|
|
2890 {
|
|
|
2891 /* does not take into account variable aliasing. */
|
|
|
2892 Lisp_Object valcontents = XSYMBOL (sym)->value;
|
|
|
2893 enum lisp_magic_handler slot;
|
|
|
2894
|
|
|
2895 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2896 return 0;
|
|
|
2897 slot = handler_type_from_function_symbol (funsym, 1);
|
|
|
2898 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND
|
|
|
2899 && slot != MAGIC_HANDLER_MAKE_LOCAL)
|
|
|
2900 /* #### temporary kludge because we haven't implemented
|
|
|
2901 lisp-magic variables completely */
|
|
|
2902 return 0;
|
|
|
2903 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]);
|
|
|
2904 }
|
|
|
2905
|
|
|
2906 static Lisp_Object
|
|
|
2907 fetch_value_maybe_past_magic (Lisp_Object sym,
|
|
|
2908 Lisp_Object follow_past_lisp_magic)
|
|
|
2909 {
|
|
|
2910 Lisp_Object value = XSYMBOL (sym)->value;
|
|
|
2911 if (SYMBOL_VALUE_LISP_MAGIC_P (value)
|
|
|
2912 && (EQ (follow_past_lisp_magic, Qt)
|
|
|
2913 || (!NILP (follow_past_lisp_magic)
|
|
|
2914 && !would_be_magic_handled (sym, follow_past_lisp_magic))))
|
|
|
2915 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed;
|
|
|
2916 return value;
|
|
|
2917 }
|
|
|
2918
|
|
|
2919 static Lisp_Object *
|
|
|
2920 value_slot_past_magic (Lisp_Object sym)
|
|
|
2921 {
|
|
|
2922 Lisp_Object *store_pointer = &XSYMBOL (sym)->value;
|
|
|
2923
|
|
|
2924 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer))
|
|
|
2925 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed;
|
|
|
2926 return store_pointer;
|
|
|
2927 }
|
|
|
2928
|
|
|
2929 static Lisp_Object
|
|
|
2930 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...)
|
|
|
2931 {
|
|
|
2932 va_list vargs;
|
|
|
2933 Lisp_Object args[20]; /* should be enough ... */
|
|
|
2934 int i;
|
|
|
2935 enum lisp_magic_handler htype;
|
|
|
2936 Lisp_Object legerdemain;
|
|
|
2937 struct symbol_value_lisp_magic *bfwd;
|
|
|
2938
|
|
440
|
2939 assert (nargs >= 0 && nargs < countof (args));
|
|
428
|
2940 legerdemain = XSYMBOL (sym)->value;
|
|
|
2941 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain));
|
|
|
2942 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain);
|
|
|
2943
|
|
|
2944 va_start (vargs, nargs);
|
|
|
2945 for (i = 0; i < nargs; i++)
|
|
|
2946 args[i] = va_arg (vargs, Lisp_Object);
|
|
|
2947 va_end (vargs);
|
|
|
2948
|
|
|
2949 htype = handler_type_from_function_symbol (funsym, 1);
|
|
|
2950 if (NILP (bfwd->handler[htype]))
|
|
|
2951 return Qunbound;
|
|
|
2952 /* #### should be reusing the arglist, not always consing anew.
|
|
|
2953 Repeated handler invocations should not cause repeated consing.
|
|
|
2954 Doesn't matter for now, because this is just a quick implementation
|
|
|
2955 for obsolescence support. */
|
|
|
2956 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym,
|
|
|
2957 bfwd->harg[htype], Qnil);
|
|
|
2958 }
|
|
|
2959
|
|
|
2960 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler,
|
|
|
2961 3, 5, 0, /*
|
|
|
2962 Don't you dare use this.
|
|
|
2963 If you do, suffer the wrath of Ben, who is likely to rename
|
|
|
2964 this function (or change the semantics of its arguments) without
|
|
|
2965 pity, thereby invalidating your code.
|
|
|
2966 */
|
|
|
2967 (variable, handler_type, handler, harg, keep_existing))
|
|
|
2968 {
|
|
|
2969 Lisp_Object valcontents;
|
|
|
2970 struct symbol_value_lisp_magic *bfwd;
|
|
|
2971 enum lisp_magic_handler htype;
|
|
|
2972 int i;
|
|
|
2973
|
|
|
2974 /* #### WARNING, only some handler types are implemented. See above.
|
|
|
2975 Actions of other types will ignore a handler if it's there.
|
|
|
2976
|
|
|
2977 #### Also, `chain-to-symbol-value-handler' and
|
|
|
2978 `symbol-function-corresponding-function' are not implemented. */
|
|
|
2979 CHECK_SYMBOL (variable);
|
|
|
2980 CHECK_SYMBOL (handler_type);
|
|
|
2981 htype = decode_magic_handler_type (handler_type);
|
|
|
2982 valcontents = XSYMBOL (variable)->value;
|
|
|
2983 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2984 {
|
|
|
2985 bfwd = alloc_lcrecord_type (struct symbol_value_lisp_magic,
|
|
|
2986 &lrecord_symbol_value_lisp_magic);
|
|
452
|
2987 zero_lcrecord (&bfwd->magic);
|
|
428
|
2988 bfwd->magic.type = SYMVAL_LISP_MAGIC;
|
|
|
2989 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2990 {
|
|
|
2991 bfwd->handler[i] = Qnil;
|
|
|
2992 bfwd->harg[i] = Qnil;
|
|
|
2993 }
|
|
|
2994 bfwd->shadowed = valcontents;
|
|
793
|
2995 XSYMBOL (variable)->value = wrap_symbol_value_magic (bfwd);
|
|
428
|
2996 }
|
|
|
2997 else
|
|
|
2998 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents);
|
|
|
2999 bfwd->handler[htype] = handler;
|
|
|
3000 bfwd->harg[htype] = harg;
|
|
|
3001
|
|
|
3002 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
3003 if (!NILP (bfwd->handler[i]))
|
|
|
3004 break;
|
|
|
3005
|
|
|
3006 if (i == MAGIC_HANDLER_MAX)
|
|
|
3007 /* there are no remaining handlers, so remove the structure. */
|
|
|
3008 XSYMBOL (variable)->value = bfwd->shadowed;
|
|
|
3009
|
|
|
3010 return Qnil;
|
|
|
3011 }
|
|
|
3012
|
|
|
3013
|
|
|
3014 /* functions for working with variable aliases. */
|
|
|
3015
|
|
|
3016 /* Follow the chain of variable aliases for SYMBOL. Return the
|
|
|
3017 resulting symbol, whose value cell is guaranteed not to be a
|
|
|
3018 symbol-value-varalias.
|
|
|
3019
|
|
|
3020 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias.
|
|
|
3021 If FUNSYM is t, always follow in such a case. If FUNSYM is nil,
|
|
|
3022 never follow; stop right there. Otherwise FUNSYM should be a
|
|
|
3023 recognized symbol-value function symbol; this means, follow
|
|
|
3024 unless there is a special handler for the named function.
|
|
|
3025
|
|
|
3026 OK, there is at least one reason why it's necessary for
|
|
|
3027 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we
|
|
|
3028 can always be sure to catch cyclic variable aliasing. If we never
|
|
|
3029 follow past Lisp magic, then if the following is done:
|
|
|
3030
|
|
|
3031 (defvaralias 'a 'b)
|
|
|
3032 add some magic behavior to a, but not a "get-value" handler
|
|
|
3033 (defvaralias 'b 'a)
|
|
|
3034
|
|
|
3035 then an attempt to retrieve a's or b's value would cause infinite
|
|
|
3036 looping in `symbol-value'.
|
|
|
3037
|
|
|
3038 We (of course) can't always follow past Lisp magic, because then
|
|
|
3039 we make any variable that is lisp-magic -> varalias behave as if
|
|
|
3040 the lisp-magic is not present at all.
|
|
|
3041 */
|
|
|
3042
|
|
|
3043 static Lisp_Object
|
|
|
3044 follow_varalias_pointers (Lisp_Object symbol,
|
|
|
3045 Lisp_Object follow_past_lisp_magic)
|
|
|
3046 {
|
|
|
3047 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16
|
|
|
3048 Lisp_Object tortoise, hare, val;
|
|
|
3049 int count;
|
|
|
3050
|
|
|
3051 /* quick out just in case */
|
|
|
3052 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value))
|
|
|
3053 return symbol;
|
|
|
3054
|
|
|
3055 /* Compare implementation of indirect_function(). */
|
|
|
3056 for (hare = tortoise = symbol, count = 0;
|
|
|
3057 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic),
|
|
|
3058 SYMBOL_VALUE_VARALIAS_P (val);
|
|
|
3059 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)),
|
|
|
3060 count++)
|
|
|
3061 {
|
|
|
3062 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue;
|
|
|
3063
|
|
|
3064 if (count & 1)
|
|
|
3065 tortoise = symbol_value_varalias_aliasee
|
|
|
3066 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic
|
|
|
3067 (tortoise, follow_past_lisp_magic)));
|
|
|
3068 if (EQ (hare, tortoise))
|
|
|
3069 return Fsignal (Qcyclic_variable_indirection, list1 (symbol));
|
|
|
3070 }
|
|
|
3071
|
|
|
3072 return hare;
|
|
|
3073 }
|
|
|
3074
|
|
|
3075 DEFUN ("defvaralias", Fdefvaralias, 2, 2, 0, /*
|
|
|
3076 Define a variable as an alias for another variable.
|
|
|
3077 Thenceforth, any operations performed on VARIABLE will actually be
|
|
|
3078 performed on ALIAS. Both VARIABLE and ALIAS should be symbols.
|
|
|
3079 If ALIAS is nil, remove any aliases for VARIABLE.
|
|
|
3080 ALIAS can itself be aliased, and the chain of variable aliases
|
|
|
3081 will be followed appropriately.
|
|
|
3082 If VARIABLE already has a value, this value will be shadowed
|
|
|
3083 until the alias is removed, at which point it will be restored.
|
|
|
3084 Currently VARIABLE cannot be a built-in variable, a variable that
|
|
|
3085 has a buffer-local value in any buffer, or the symbols nil or t.
|
|
|
3086 \(ALIAS, however, can be any type of variable.)
|
|
|
3087 */
|
|
|
3088 (variable, alias))
|
|
|
3089 {
|
|
|
3090 struct symbol_value_varalias *bfwd;
|
|
|
3091 Lisp_Object valcontents;
|
|
|
3092
|
|
|
3093 CHECK_SYMBOL (variable);
|
|
|
3094 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
3095
|
|
|
3096 valcontents = XSYMBOL (variable)->value;
|
|
|
3097
|
|
|
3098 if (NILP (alias))
|
|
|
3099 {
|
|
|
3100 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3101 {
|
|
|
3102 XSYMBOL (variable)->value =
|
|
|
3103 symbol_value_varalias_shadowed
|
|
|
3104 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3105 }
|
|
|
3106 return Qnil;
|
|
|
3107 }
|
|
|
3108
|
|
|
3109 CHECK_SYMBOL (alias);
|
|
|
3110 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3111 {
|
|
|
3112 /* transmogrify */
|
|
|
3113 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = alias;
|
|
|
3114 return Qnil;
|
|
|
3115 }
|
|
|
3116
|
|
|
3117 if (SYMBOL_VALUE_MAGIC_P (valcontents)
|
|
|
3118 && !UNBOUNDP (valcontents))
|
|
563
|
3119 invalid_change ("Variable is magic and cannot be aliased", variable);
|
|
428
|
3120 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
3121
|
|
|
3122 bfwd = alloc_lcrecord_type (struct symbol_value_varalias,
|
|
|
3123 &lrecord_symbol_value_varalias);
|
|
452
|
3124 zero_lcrecord (&bfwd->magic);
|
|
428
|
3125 bfwd->magic.type = SYMVAL_VARALIAS;
|
|
|
3126 bfwd->aliasee = alias;
|
|
|
3127 bfwd->shadowed = valcontents;
|
|
|
3128
|
|
793
|
3129 valcontents = wrap_symbol_value_magic (bfwd);
|
|
428
|
3130 XSYMBOL (variable)->value = valcontents;
|
|
|
3131 return Qnil;
|
|
|
3132 }
|
|
|
3133
|
|
|
3134 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /*
|
|
|
3135 If VARIABLE is aliased to another variable, return that variable.
|
|
|
3136 VARIABLE should be a symbol. If VARIABLE is not aliased, return nil.
|
|
|
3137 Variable aliases are created with `defvaralias'. See also
|
|
|
3138 `indirect-variable'.
|
|
|
3139 */
|
|
|
3140 (variable, follow_past_lisp_magic))
|
|
|
3141 {
|
|
|
3142 Lisp_Object valcontents;
|
|
|
3143
|
|
|
3144 CHECK_SYMBOL (variable);
|
|
|
3145 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3146 {
|
|
|
3147 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
|
3148 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
|
3149 }
|
|
|
3150
|
|
|
3151 valcontents = fetch_value_maybe_past_magic (variable,
|
|
|
3152 follow_past_lisp_magic);
|
|
|
3153
|
|
|
3154 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3155 return symbol_value_varalias_aliasee
|
|
|
3156 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3157 else
|
|
|
3158 return Qnil;
|
|
|
3159 }
|
|
|
3160
|
|
|
3161 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /*
|
|
|
3162 Return the variable at the end of OBJECT's variable-alias chain.
|
|
|
3163 If OBJECT is a symbol, follow all variable aliases and return
|
|
|
3164 the final (non-aliased) symbol. Variable aliases are created with
|
|
|
3165 the function `defvaralias'.
|
|
|
3166 If OBJECT is not a symbol, just return it.
|
|
|
3167 Signal a cyclic-variable-indirection error if there is a loop in the
|
|
|
3168 variable chain of symbols.
|
|
|
3169 */
|
|
|
3170 (object, follow_past_lisp_magic))
|
|
|
3171 {
|
|
|
3172 if (!SYMBOLP (object))
|
|
|
3173 return object;
|
|
|
3174 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3175 {
|
|
|
3176 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
|
3177 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
|
3178 }
|
|
|
3179 return follow_varalias_pointers (object, follow_past_lisp_magic);
|
|
|
3180 }
|
|
|
3181
|
|
|
3182
|
|
|
3183 /************************************************************************/
|
|
|
3184 /* initialization */
|
|
|
3185 /************************************************************************/
|
|
|
3186
|
|
|
3187 /* A dumped XEmacs image has a lot more than 1511 symbols. Last
|
|
|
3188 estimate was that there were actually around 6300. So let's try
|
|
|
3189 making this bigger and see if we get better hashing behavior. */
|
|
|
3190 #define OBARRAY_SIZE 16411
|
|
|
3191
|
|
|
3192 #ifndef Qzero
|
|
|
3193 Lisp_Object Qzero;
|
|
|
3194 #endif
|
|
|
3195 #ifndef Qnull_pointer
|
|
|
3196 Lisp_Object Qnull_pointer;
|
|
|
3197 #endif
|
|
|
3198
|
|
|
3199 /* some losing systems can't have static vars at function scope... */
|
|
442
|
3200 static const struct symbol_value_magic guts_of_unbound_marker =
|
|
|
3201 { /* struct symbol_value_magic */
|
|
|
3202 { /* struct lcrecord_header */
|
|
|
3203 { /* struct lrecord_header */
|
|
|
3204 lrecord_type_symbol_value_forward, /* lrecord_type_index */
|
|
|
3205 1, /* mark bit */
|
|
|
3206 1, /* c_readonly bit */
|
|
|
3207 1, /* lisp_readonly bit */
|
|
|
3208 },
|
|
|
3209 0, /* next */
|
|
|
3210 0, /* uid */
|
|
|
3211 0, /* free */
|
|
|
3212 },
|
|
|
3213 0, /* value */
|
|
|
3214 SYMVAL_UNBOUND_MARKER
|
|
|
3215 };
|
|
428
|
3216
|
|
|
3217 void
|
|
|
3218 init_symbols_once_early (void)
|
|
|
3219 {
|
|
442
|
3220 INIT_LRECORD_IMPLEMENTATION (symbol);
|
|
|
3221 INIT_LRECORD_IMPLEMENTATION (symbol_value_forward);
|
|
|
3222 INIT_LRECORD_IMPLEMENTATION (symbol_value_buffer_local);
|
|
|
3223 INIT_LRECORD_IMPLEMENTATION (symbol_value_lisp_magic);
|
|
|
3224 INIT_LRECORD_IMPLEMENTATION (symbol_value_varalias);
|
|
|
3225
|
|
440
|
3226 reinit_symbols_once_early ();
|
|
428
|
3227
|
|
|
3228 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is
|
|
|
3229 called the first time. */
|
|
867
|
3230 Qnil = Fmake_symbol (make_string_nocopy ((const Ibyte *) "nil", 3));
|
|
793
|
3231 XSTRING_PLIST (XSYMBOL (Qnil)->name) = Qnil;
|
|
428
|
3232 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihil */
|
|
|
3233 XSYMBOL (Qnil)->plist = Qnil;
|
|
|
3234
|
|
|
3235 Vobarray = make_vector (OBARRAY_SIZE, Qzero);
|
|
|
3236 initial_obarray = Vobarray;
|
|
|
3237 staticpro (&initial_obarray);
|
|
|
3238 /* Intern nil in the obarray */
|
|
|
3239 {
|
|
793
|
3240 unsigned int hash = hash_string (XSTRING_DATA (XSYMBOL (Qnil)->name), 3);
|
|
428
|
3241 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil;
|
|
|
3242 }
|
|
|
3243
|
|
|
3244 {
|
|
|
3245 /* Required to get around a GCC syntax error on certain
|
|
|
3246 architectures */
|
|
442
|
3247 const struct symbol_value_magic *tem = &guts_of_unbound_marker;
|
|
428
|
3248
|
|
793
|
3249 Qunbound = wrap_symbol_value_magic (tem);
|
|
428
|
3250 }
|
|
|
3251
|
|
|
3252 XSYMBOL (Qnil)->function = Qunbound;
|
|
|
3253
|
|
563
|
3254 DEFSYMBOL (Qt);
|
|
444
|
3255 XSYMBOL (Qt)->value = Qt; /* Veritas aeterna */
|
|
428
|
3256 Vquit_flag = Qnil;
|
|
|
3257
|
|
452
|
3258 dump_add_root_object (&Qnil);
|
|
|
3259 dump_add_root_object (&Qunbound);
|
|
|
3260 dump_add_root_object (&Vquit_flag);
|
|
428
|
3261 }
|
|
|
3262
|
|
|
3263 void
|
|
440
|
3264 reinit_symbols_once_early (void)
|
|
|
3265 {
|
|
|
3266 }
|
|
|
3267
|
|
442
|
3268 static void
|
|
|
3269 defsymbol_massage_name_1 (Lisp_Object *location, const char *name, int dump_p,
|
|
|
3270 int multiword_predicate_p)
|
|
|
3271 {
|
|
|
3272 char temp[500];
|
|
|
3273 int len = strlen (name) - 1;
|
|
|
3274 int i;
|
|
|
3275
|
|
|
3276 if (multiword_predicate_p)
|
|
647
|
3277 assert (len + 1 < (int) sizeof (temp));
|
|
442
|
3278 else
|
|
647
|
3279 assert (len < (int) sizeof (temp));
|
|
442
|
3280 strcpy (temp, name + 1); /* Remove initial Q */
|
|
|
3281 if (multiword_predicate_p)
|
|
|
3282 {
|
|
|
3283 strcpy (temp + len - 1, "_p");
|
|
|
3284 len++;
|
|
|
3285 }
|
|
|
3286 for (i = 0; i < len; i++)
|
|
|
3287 if (temp[i] == '_')
|
|
|
3288 temp[i] = '-';
|
|
867
|
3289 *location = Fintern (make_string ((const Ibyte *) temp, len), Qnil);
|
|
442
|
3290 if (dump_p)
|
|
|
3291 staticpro (location);
|
|
|
3292 else
|
|
|
3293 staticpro_nodump (location);
|
|
|
3294 }
|
|
|
3295
|
|
440
|
3296 void
|
|
442
|
3297 defsymbol_massage_name_nodump (Lisp_Object *location, const char *name)
|
|
|
3298 {
|
|
|
3299 defsymbol_massage_name_1 (location, name, 0, 0);
|
|
|
3300 }
|
|
|
3301
|
|
|
3302 void
|
|
|
3303 defsymbol_massage_name (Lisp_Object *location, const char *name)
|
|
428
|
3304 {
|
|
442
|
3305 defsymbol_massage_name_1 (location, name, 1, 0);
|
|
|
3306 }
|
|
|
3307
|
|
|
3308 void
|
|
|
3309 defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location,
|
|
|
3310 const char *name)
|
|
|
3311 {
|
|
|
3312 defsymbol_massage_name_1 (location, name, 0, 1);
|
|
|
3313 }
|
|
|
3314
|
|
|
3315 void
|
|
|
3316 defsymbol_massage_multiword_predicate (Lisp_Object *location, const char *name)
|
|
|
3317 {
|
|
|
3318 defsymbol_massage_name_1 (location, name, 1, 1);
|
|
|
3319 }
|
|
|
3320
|
|
|
3321 void
|
|
|
3322 defsymbol_nodump (Lisp_Object *location, const char *name)
|
|
|
3323 {
|
|
867
|
3324 *location = Fintern (make_string_nocopy ((const Ibyte *) name,
|
|
428
|
3325 strlen (name)),
|
|
|
3326 Qnil);
|
|
|
3327 staticpro_nodump (location);
|
|
|
3328 }
|
|
|
3329
|
|
|
3330 void
|
|
442
|
3331 defsymbol (Lisp_Object *location, const char *name)
|
|
428
|
3332 {
|
|
867
|
3333 *location = Fintern (make_string_nocopy ((const Ibyte *) name,
|
|
428
|
3334 strlen (name)),
|
|
|
3335 Qnil);
|
|
|
3336 staticpro (location);
|
|
|
3337 }
|
|
|
3338
|
|
|
3339 void
|
|
442
|
3340 defkeyword (Lisp_Object *location, const char *name)
|
|
428
|
3341 {
|
|
|
3342 defsymbol (location, name);
|
|
|
3343 Fset (*location, *location);
|
|
|
3344 }
|
|
|
3345
|
|
442
|
3346 void
|
|
|
3347 defkeyword_massage_name (Lisp_Object *location, const char *name)
|
|
|
3348 {
|
|
|
3349 char temp[500];
|
|
|
3350 int len = strlen (name);
|
|
|
3351
|
|
647
|
3352 assert (len < (int) sizeof (temp));
|
|
442
|
3353 strcpy (temp, name);
|
|
|
3354 temp[1] = ':'; /* it's an underscore in the C variable */
|
|
|
3355
|
|
|
3356 defsymbol_massage_name (location, temp);
|
|
|
3357 Fset (*location, *location);
|
|
|
3358 }
|
|
|
3359
|
|
428
|
3360 #ifdef DEBUG_XEMACS
|
|
930
|
3361 /* Check that nobody spazzed writing a builtin (non-module) DEFUN. */
|
|
428
|
3362 static void
|
|
|
3363 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym)
|
|
|
3364 {
|
|
930
|
3365 if (!initialized) {
|
|
|
3366 assert (subr->min_args >= 0);
|
|
|
3367 assert (subr->min_args <= SUBR_MAX_ARGS);
|
|
|
3368
|
|
|
3369 if (subr->max_args != MANY &&
|
|
|
3370 subr->max_args != UNEVALLED)
|
|
|
3371 {
|
|
|
3372 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */
|
|
|
3373 assert (subr->max_args <= SUBR_MAX_ARGS);
|
|
|
3374 assert (subr->min_args <= subr->max_args);
|
|
|
3375 }
|
|
|
3376
|
|
|
3377 assert (UNBOUNDP (XSYMBOL (sym)->function));
|
|
|
3378 }
|
|
428
|
3379 }
|
|
|
3380 #else
|
|
|
3381 #define check_sane_subr(subr, sym) /* nothing */
|
|
|
3382 #endif
|
|
|
3383
|
|
|
3384 #ifdef HAVE_SHLIB
|
|
|
3385 /*
|
|
|
3386 * If we are not in a pure undumped Emacs, we need to make a duplicate of
|
|
|
3387 * the subr. This is because the only time this function will be called
|
|
|
3388 * in a running Emacs is when a dynamically loaded module is adding a
|
|
|
3389 * subr, and we need to make sure that the subr is in allocated, Lisp-
|
|
|
3390 * accessible memory. The address assigned to the static subr struct
|
|
|
3391 * in the shared object will be a trampoline address, so we need to create
|
|
|
3392 * a copy here to ensure that a real address is used.
|
|
|
3393 *
|
|
|
3394 * Once we have copied everything across, we re-use the original static
|
|
|
3395 * structure to store a pointer to the newly allocated one. This will be
|
|
|
3396 * used in emodules.c by emodules_doc_subr() to find a pointer to the
|
|
442
|
3397 * allocated object so that we can set its doc string properly.
|
|
428
|
3398 *
|
|
442
|
3399 * NOTE: We don't actually use the DOC pointer here any more, but we did
|
|
428
|
3400 * in an earlier implementation of module support. There is no harm in
|
|
|
3401 * setting it here in case we ever need it in future implementations.
|
|
|
3402 * subr->doc will point to the new subr structure that was allocated.
|
|
442
|
3403 * Code can then get this value from the static subr structure and use
|
|
428
|
3404 * it if required.
|
|
|
3405 *
|
|
442
|
3406 * FIXME: Should newsubr be staticpro()'ed? I don't think so but I need
|
|
428
|
3407 * a guru to check.
|
|
|
3408 */
|
|
930
|
3409 #define check_module_subr(subr) \
|
|
|
3410 do { \
|
|
|
3411 if (initialized) { \
|
|
|
3412 Lisp_Subr *newsubr; \
|
|
|
3413 Lisp_Object f; \
|
|
|
3414 \
|
|
|
3415 if (subr->min_args < 0) \
|
|
|
3416 signal_ferror (Qdll_error, "%s min_args (%hd) too small", \
|
|
|
3417 subr_name (subr), subr->min_args); \
|
|
|
3418 if (subr->min_args > SUBR_MAX_ARGS) \
|
|
|
3419 signal_ferror (Qdll_error, "%s min_args (%hd) too big (max = %d)", \
|
|
|
3420 subr_name (subr), subr->min_args, SUBR_MAX_ARGS); \
|
|
|
3421 \
|
|
|
3422 if (subr->max_args != MANY && \
|
|
|
3423 subr->max_args != UNEVALLED) \
|
|
|
3424 { \
|
|
|
3425 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */ \
|
|
|
3426 if (subr->max_args > SUBR_MAX_ARGS) \
|
|
|
3427 signal_ferror (Qdll_error, "%s max_args (%hd) too big (max = %d)", \
|
|
|
3428 subr_name (subr), subr->max_args, SUBR_MAX_ARGS); \
|
|
|
3429 if (subr->min_args > subr->max_args) \
|
|
|
3430 signal_ferror (Qdll_error, "%s min_args (%hd) > max_args (%hd)", \
|
|
|
3431 subr_name (subr), subr->min_args, subr->max_args); \
|
|
|
3432 } \
|
|
|
3433 \
|
|
|
3434 f = XSYMBOL (sym)->function; \
|
|
|
3435 if (!UNBOUNDP (f) && (!CONSP (f) || !EQ (XCAR (f), Qautoload))) \
|
|
|
3436 signal_ferror (Qdll_error, "Attempt to redefine %s", subr_name (subr)); \
|
|
|
3437 \
|
|
|
3438 newsubr = (Lisp_Subr *) xmalloc (sizeof (Lisp_Subr)); \
|
|
|
3439 memcpy (newsubr, subr, sizeof (Lisp_Subr)); \
|
|
|
3440 subr->doc = (const char *)newsubr; \
|
|
|
3441 subr = newsubr; \
|
|
|
3442 } \
|
|
428
|
3443 } while (0)
|
|
|
3444 #else /* ! HAVE_SHLIB */
|
|
930
|
3445 #define check_module_subr(subr)
|
|
428
|
3446 #endif
|
|
|
3447
|
|
|
3448 void
|
|
|
3449 defsubr (Lisp_Subr *subr)
|
|
|
3450 {
|
|
|
3451 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3452 Lisp_Object fun;
|
|
|
3453
|
|
|
3454 check_sane_subr (subr, sym);
|
|
930
|
3455 check_module_subr (subr);
|
|
428
|
3456
|
|
793
|
3457 fun = wrap_subr (subr);
|
|
428
|
3458 XSYMBOL (sym)->function = fun;
|
|
|
3459 }
|
|
|
3460
|
|
|
3461 /* Define a lisp macro using a Lisp_Subr. */
|
|
|
3462 void
|
|
|
3463 defsubr_macro (Lisp_Subr *subr)
|
|
|
3464 {
|
|
|
3465 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3466 Lisp_Object fun;
|
|
|
3467
|
|
|
3468 check_sane_subr (subr, sym);
|
|
930
|
3469 check_module_subr (subr);
|
|
428
|
3470
|
|
793
|
3471 fun = wrap_subr (subr);
|
|
428
|
3472 XSYMBOL (sym)->function = Fcons (Qmacro, fun);
|
|
|
3473 }
|
|
|
3474
|
|
442
|
3475 static void
|
|
|
3476 deferror_1 (Lisp_Object *symbol, const char *name, const char *messuhhj,
|
|
|
3477 Lisp_Object inherits_from, int massage_p)
|
|
428
|
3478 {
|
|
|
3479 Lisp_Object conds;
|
|
442
|
3480 if (massage_p)
|
|
|
3481 defsymbol_massage_name (symbol, name);
|
|
|
3482 else
|
|
|
3483 defsymbol (symbol, name);
|
|
428
|
3484
|
|
|
3485 assert (SYMBOLP (inherits_from));
|
|
|
3486 conds = Fget (inherits_from, Qerror_conditions, Qnil);
|
|
|
3487 Fput (*symbol, Qerror_conditions, Fcons (*symbol, conds));
|
|
771
|
3488 /* NOT build_msg_string (). This function is called at load time
|
|
428
|
3489 and the string needs to get translated at run time. (This happens
|
|
|
3490 in the function (display-error) in cmdloop.el.) */
|
|
771
|
3491 Fput (*symbol, Qerror_message, build_msg_string (messuhhj));
|
|
428
|
3492 }
|
|
|
3493
|
|
|
3494 void
|
|
442
|
3495 deferror (Lisp_Object *symbol, const char *name, const char *messuhhj,
|
|
|
3496 Lisp_Object inherits_from)
|
|
|
3497 {
|
|
|
3498 deferror_1 (symbol, name, messuhhj, inherits_from, 0);
|
|
|
3499 }
|
|
|
3500
|
|
|
3501 void
|
|
|
3502 deferror_massage_name (Lisp_Object *symbol, const char *name,
|
|
|
3503 const char *messuhhj, Lisp_Object inherits_from)
|
|
|
3504 {
|
|
|
3505 deferror_1 (symbol, name, messuhhj, inherits_from, 1);
|
|
|
3506 }
|
|
|
3507
|
|
|
3508 void
|
|
|
3509 deferror_massage_name_and_message (Lisp_Object *symbol, const char *name,
|
|
|
3510 Lisp_Object inherits_from)
|
|
|
3511 {
|
|
|
3512 char temp[500];
|
|
|
3513 int i;
|
|
|
3514 int len = strlen (name) - 1;
|
|
|
3515
|
|
647
|
3516 assert (len < (int) sizeof (temp));
|
|
442
|
3517 strcpy (temp, name + 1); /* Remove initial Q */
|
|
|
3518 temp[0] = toupper (temp[0]);
|
|
|
3519 for (i = 0; i < len; i++)
|
|
|
3520 if (temp[i] == '_')
|
|
|
3521 temp[i] = ' ';
|
|
|
3522
|
|
|
3523 deferror_1 (symbol, name, temp, inherits_from, 1);
|
|
|
3524 }
|
|
|
3525
|
|
|
3526 void
|
|
428
|
3527 syms_of_symbols (void)
|
|
|
3528 {
|
|
442
|
3529 DEFSYMBOL (Qvariable_documentation);
|
|
|
3530 DEFSYMBOL (Qvariable_domain); /* I18N3 */
|
|
|
3531 DEFSYMBOL (Qad_advice_info);
|
|
|
3532 DEFSYMBOL (Qad_activate);
|
|
|
3533
|
|
|
3534 DEFSYMBOL (Qget_value);
|
|
|
3535 DEFSYMBOL (Qset_value);
|
|
|
3536 DEFSYMBOL (Qbound_predicate);
|
|
|
3537 DEFSYMBOL (Qmake_unbound);
|
|
|
3538 DEFSYMBOL (Qlocal_predicate);
|
|
|
3539 DEFSYMBOL (Qmake_local);
|
|
|
3540
|
|
|
3541 DEFSYMBOL (Qboundp);
|
|
|
3542 DEFSYMBOL (Qglobally_boundp);
|
|
|
3543 DEFSYMBOL (Qmakunbound);
|
|
|
3544 DEFSYMBOL (Qsymbol_value);
|
|
|
3545 DEFSYMBOL (Qset);
|
|
|
3546 DEFSYMBOL (Qsetq_default);
|
|
|
3547 DEFSYMBOL (Qdefault_boundp);
|
|
|
3548 DEFSYMBOL (Qdefault_value);
|
|
|
3549 DEFSYMBOL (Qset_default);
|
|
|
3550 DEFSYMBOL (Qmake_variable_buffer_local);
|
|
|
3551 DEFSYMBOL (Qmake_local_variable);
|
|
|
3552 DEFSYMBOL (Qkill_local_variable);
|
|
|
3553 DEFSYMBOL (Qkill_console_local_variable);
|
|
|
3554 DEFSYMBOL (Qsymbol_value_in_buffer);
|
|
|
3555 DEFSYMBOL (Qsymbol_value_in_console);
|
|
|
3556 DEFSYMBOL (Qlocal_variable_p);
|
|
|
3557
|
|
|
3558 DEFSYMBOL (Qconst_integer);
|
|
|
3559 DEFSYMBOL (Qconst_boolean);
|
|
|
3560 DEFSYMBOL (Qconst_object);
|
|
|
3561 DEFSYMBOL (Qconst_specifier);
|
|
|
3562 DEFSYMBOL (Qdefault_buffer);
|
|
|
3563 DEFSYMBOL (Qcurrent_buffer);
|
|
|
3564 DEFSYMBOL (Qconst_current_buffer);
|
|
|
3565 DEFSYMBOL (Qdefault_console);
|
|
|
3566 DEFSYMBOL (Qselected_console);
|
|
|
3567 DEFSYMBOL (Qconst_selected_console);
|
|
428
|
3568
|
|
|
3569 DEFSUBR (Fintern);
|
|
|
3570 DEFSUBR (Fintern_soft);
|
|
|
3571 DEFSUBR (Funintern);
|
|
|
3572 DEFSUBR (Fmapatoms);
|
|
|
3573 DEFSUBR (Fapropos_internal);
|
|
|
3574
|
|
|
3575 DEFSUBR (Fsymbol_function);
|
|
|
3576 DEFSUBR (Fsymbol_plist);
|
|
|
3577 DEFSUBR (Fsymbol_name);
|
|
|
3578 DEFSUBR (Fmakunbound);
|
|
|
3579 DEFSUBR (Ffmakunbound);
|
|
|
3580 DEFSUBR (Fboundp);
|
|
|
3581 DEFSUBR (Fglobally_boundp);
|
|
|
3582 DEFSUBR (Ffboundp);
|
|
|
3583 DEFSUBR (Ffset);
|
|
|
3584 DEFSUBR (Fdefine_function);
|
|
|
3585 Ffset (intern ("defalias"), intern ("define-function"));
|
|
|
3586 DEFSUBR (Fsetplist);
|
|
|
3587 DEFSUBR (Fsymbol_value_in_buffer);
|
|
|
3588 DEFSUBR (Fsymbol_value_in_console);
|
|
|
3589 DEFSUBR (Fbuilt_in_variable_type);
|
|
|
3590 DEFSUBR (Fsymbol_value);
|
|
|
3591 DEFSUBR (Fset);
|
|
|
3592 DEFSUBR (Fdefault_boundp);
|
|
|
3593 DEFSUBR (Fdefault_value);
|
|
|
3594 DEFSUBR (Fset_default);
|
|
|
3595 DEFSUBR (Fsetq_default);
|
|
|
3596 DEFSUBR (Fmake_variable_buffer_local);
|
|
|
3597 DEFSUBR (Fmake_local_variable);
|
|
|
3598 DEFSUBR (Fkill_local_variable);
|
|
|
3599 DEFSUBR (Fkill_console_local_variable);
|
|
|
3600 DEFSUBR (Flocal_variable_p);
|
|
|
3601 DEFSUBR (Fdefvaralias);
|
|
|
3602 DEFSUBR (Fvariable_alias);
|
|
|
3603 DEFSUBR (Findirect_variable);
|
|
|
3604 DEFSUBR (Fdontusethis_set_symbol_value_handler);
|
|
|
3605 }
|
|
|
3606
|
|
|
3607 /* Create and initialize a Lisp variable whose value is forwarded to C data */
|
|
|
3608 void
|
|
442
|
3609 defvar_magic (const char *symbol_name, const struct symbol_value_forward *magic)
|
|
428
|
3610 {
|
|
442
|
3611 Lisp_Object sym;
|
|
428
|
3612
|
|
|
3613 #if defined(HAVE_SHLIB)
|
|
|
3614 /*
|
|
|
3615 * As with defsubr(), this will only be called in a dumped Emacs when
|
|
|
3616 * we are adding variables from a dynamically loaded module. That means
|
|
|
3617 * we can't use purespace. Take that into account.
|
|
|
3618 */
|
|
|
3619 if (initialized)
|
|
|
3620 sym = Fintern (build_string (symbol_name), Qnil);
|
|
|
3621 else
|
|
|
3622 #endif
|
|
867
|
3623 sym = Fintern (make_string_nocopy ((const Ibyte *) symbol_name,
|
|
428
|
3624 strlen (symbol_name)), Qnil);
|
|
|
3625
|
|
793
|
3626 XSYMBOL (sym)->value = wrap_pointer_1 (magic);
|
|
428
|
3627 }
|
|
|
3628
|
|
|
3629 void
|
|
|
3630 vars_of_symbols (void)
|
|
|
3631 {
|
|
|
3632 DEFVAR_LISP ("obarray", &Vobarray /*
|
|
|
3633 Symbol table for use by `intern' and `read'.
|
|
|
3634 It is a vector whose length ought to be prime for best results.
|
|
|
3635 The vector's contents don't make sense if examined from Lisp programs;
|
|
|
3636 to find all the symbols in an obarray, use `mapatoms'.
|
|
|
3637 */ );
|
|
|
3638 /* obarray has been initialized long before */
|
|
|
3639 }
|
