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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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442
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3 Copyright (C) 1995, 2000 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.30. */
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23
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24 /* This file has been Mule-ized. */
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25
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26 /* NOTE:
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27
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28 The value cell of a symbol can contain a simple value or one of
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29 various symbol-value-magic objects. Some of these objects can
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30 chain into other kinds of objects. Here is a table of possibilities:
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31
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32 1a) simple value
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33 1b) Qunbound
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34 1c) symbol-value-forward, excluding Qunbound
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35 2) symbol-value-buffer-local -> 1a or 1b or 1c
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36 3) symbol-value-lisp-magic -> 1a or 1b or 1c
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37 4) symbol-value-lisp-magic -> symbol-value-buffer-local -> 1a or 1b or 1c
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38 5) symbol-value-varalias
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39 6) symbol-value-lisp-magic -> symbol-value-varalias
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40
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41 The "chain" of a symbol-value-buffer-local is its current_value slot.
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42
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43 The "chain" of a symbol-value-lisp-magic is its shadowed slot, which
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44 applies for handler types without associated handlers.
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45
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46 All other fields in all the structures (including the "shadowed" slot
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47 in a symbol-value-varalias) can *only* contain a simple value or Qunbound.
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48
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49 */
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50
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51 /* #### Ugh, though, this file does awful things with symbol-value-magic
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52 objects. This ought to be cleaned up. */
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53
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54 #include <config.h>
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55 #include "lisp.h"
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56
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57 #include "buffer.h" /* for Vbuffer_defaults */
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58 #include "console.h"
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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 Lisp_Object pname;
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94
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95 mark_object (sym->value);
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96 mark_object (sym->function);
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97 XSETSTRING (pname, sym->name);
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98 mark_object (pname);
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99 if (!symbol_next (sym))
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100 return sym->plist;
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101 else
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102 {
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103 mark_object (sym->plist);
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104 /* Mark the rest of the symbols in the obarray hash-chain */
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105 sym = symbol_next (sym);
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106 XSETSYMBOL (obj, sym);
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107 return obj;
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108 }
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109 }
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110
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111 static const struct lrecord_description symbol_description[] = {
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440
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112 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, next) },
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113 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, name) },
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114 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, value) },
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115 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, function) },
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116 { XD_LISP_OBJECT, offsetof (Lisp_Symbol, plist) },
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428
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117 { XD_END }
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118 };
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119
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442
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120 /* Symbol plists are directly accessible, so we need to protect against
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121 invalid property list structure */
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122
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123 static Lisp_Object
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124 symbol_getprop (Lisp_Object symbol, Lisp_Object property)
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125 {
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126 return external_plist_get (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME);
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127 }
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128
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129 static int
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130 symbol_putprop (Lisp_Object symbol, Lisp_Object property, Lisp_Object value)
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131 {
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132 external_plist_put (&XSYMBOL (symbol)->plist, property, value, 0, ERROR_ME);
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133 return 1;
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134 }
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135
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136 static int
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137 symbol_remprop (Lisp_Object symbol, Lisp_Object property)
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138 {
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139 return external_remprop (&XSYMBOL (symbol)->plist, property, 0, ERROR_ME);
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140 }
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141
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142 DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS ("symbol", symbol,
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143 mark_symbol, print_symbol,
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144 0, 0, 0, symbol_description,
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145 symbol_getprop,
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146 symbol_putprop,
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147 symbol_remprop,
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148 Fsymbol_plist,
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149 Lisp_Symbol);
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428
|
150
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151
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152 /**********************************************************************/
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153 /* Intern */
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154 /**********************************************************************/
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155
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156 /* #### using a vector here is way bogus. Use a hash table instead. */
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157
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158 Lisp_Object Vobarray;
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159
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160 static Lisp_Object initial_obarray;
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161
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162 /* oblookup stores the bucket number here, for the sake of Funintern. */
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163
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164 static int oblookup_last_bucket_number;
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165
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166 static Lisp_Object
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167 check_obarray (Lisp_Object obarray)
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168 {
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169 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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170 {
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171 /* If Vobarray is now invalid, force it to be valid. */
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172 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
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173
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174 obarray = wrong_type_argument (Qvectorp, obarray);
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175 }
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176 return obarray;
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|
177 }
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178
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179 Lisp_Object
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442
|
180 intern (const char *str)
|
|
428
|
181 {
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|
|
182 Bytecount len = strlen (str);
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442
|
183 const Bufbyte *buf = (const Bufbyte *) str;
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428
|
184 Lisp_Object obarray = Vobarray;
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185
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186 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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187 obarray = check_obarray (obarray);
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188
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189 {
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190 Lisp_Object tem = oblookup (obarray, buf, len);
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191 if (SYMBOLP (tem))
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192 return tem;
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193 }
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194
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195 return Fintern (make_string (buf, len), obarray);
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196 }
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197
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198 DEFUN ("intern", Fintern, 1, 2, 0, /*
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199 Return the canonical symbol whose name is STRING.
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|
200 If there is none, one is created by this function and returned.
|
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444
|
201 Optional second argument OBARRAY specifies the obarray to use;
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|
202 it defaults to the value of the variable `obarray'.
|
|
428
|
203 */
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204 (string, obarray))
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|
205 {
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|
|
206 Lisp_Object object, *ptr;
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440
|
207 Lisp_Symbol *symbol;
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428
|
208 Bytecount len;
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209
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|
|
210 if (NILP (obarray)) obarray = Vobarray;
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211 obarray = check_obarray (obarray);
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212
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|
|
213 CHECK_STRING (string);
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214
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215 len = XSTRING_LENGTH (string);
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|
216 object = oblookup (obarray, XSTRING_DATA (string), len);
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|
217 if (!INTP (object))
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|
|
218 /* Found it */
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|
219 return object;
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220
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|
|
221 ptr = &XVECTOR_DATA (obarray)[XINT (object)];
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222
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|
223 object = Fmake_symbol (string);
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|
224 symbol = XSYMBOL (object);
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225
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|
|
226 if (SYMBOLP (*ptr))
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227 symbol_next (symbol) = XSYMBOL (*ptr);
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|
228 else
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|
|
229 symbol_next (symbol) = 0;
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|
|
230 *ptr = object;
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231
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232 if (string_byte (symbol_name (symbol), 0) == ':' && EQ (obarray, Vobarray))
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|
233 {
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234 /* The LISP way is to put keywords in their own package, but we
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|
235 don't have packages, so we do something simpler. Someday,
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|
236 maybe we'll have packages and then this will be reworked.
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|
|
237 --Stig. */
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|
|
238 symbol_value (symbol) = object;
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|
|
239 }
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|
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240
|
|
|
241 return object;
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|
|
242 }
|
|
|
243
|
|
|
244 DEFUN ("intern-soft", Fintern_soft, 1, 2, 0, /*
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|
|
245 Return the canonical symbol named NAME, or nil if none exists.
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|
|
246 NAME may be a string or a symbol. If it is a symbol, that exact
|
|
|
247 symbol is searched for.
|
|
444
|
248 Optional second argument OBARRAY specifies the obarray to use;
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|
|
249 it defaults to the value of the variable `obarray'.
|
|
428
|
250 */
|
|
|
251 (name, obarray))
|
|
|
252 {
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|
|
253 /* #### Bug! (intern-soft "nil") returns nil. Perhaps we should
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|
|
254 add a DEFAULT-IF-NOT-FOUND arg, like in get. */
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|
|
255 Lisp_Object tem;
|
|
440
|
256 Lisp_String *string;
|
|
428
|
257
|
|
|
258 if (NILP (obarray)) obarray = Vobarray;
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|
|
259 obarray = check_obarray (obarray);
|
|
|
260
|
|
|
261 if (!SYMBOLP (name))
|
|
|
262 {
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|
|
263 CHECK_STRING (name);
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|
|
264 string = XSTRING (name);
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|
|
265 }
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|
|
266 else
|
|
|
267 string = symbol_name (XSYMBOL (name));
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|
|
268
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|
|
269 tem = oblookup (obarray, string_data (string), string_length (string));
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|
|
270 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem)))
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|
|
271 return Qnil;
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|
|
272 else
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|
|
273 return tem;
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|
|
274 }
|
|
|
275
|
|
|
276 DEFUN ("unintern", Funintern, 1, 2, 0, /*
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|
|
277 Delete the symbol named NAME, if any, from OBARRAY.
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|
|
278 The value is t if a symbol was found and deleted, nil otherwise.
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|
|
279 NAME may be a string or a symbol. If it is a symbol, that symbol
|
|
|
280 is deleted, if it belongs to OBARRAY--no other symbol is deleted.
|
|
444
|
281 OBARRAY defaults to the value of the variable `obarray'.
|
|
428
|
282 */
|
|
|
283 (name, obarray))
|
|
|
284 {
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|
|
285 Lisp_Object tem;
|
|
440
|
286 Lisp_String *string;
|
|
428
|
287 int hash;
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|
|
288
|
|
|
289 if (NILP (obarray)) obarray = Vobarray;
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|
|
290 obarray = check_obarray (obarray);
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|
|
291
|
|
|
292 if (SYMBOLP (name))
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|
|
293 string = symbol_name (XSYMBOL (name));
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|
|
294 else
|
|
|
295 {
|
|
|
296 CHECK_STRING (name);
|
|
|
297 string = XSTRING (name);
|
|
|
298 }
|
|
|
299
|
|
|
300 tem = oblookup (obarray, string_data (string), string_length (string));
|
|
|
301 if (INTP (tem))
|
|
|
302 return Qnil;
|
|
|
303 /* If arg was a symbol, don't delete anything but that symbol itself. */
|
|
|
304 if (SYMBOLP (name) && !EQ (name, tem))
|
|
|
305 return Qnil;
|
|
|
306
|
|
|
307 hash = oblookup_last_bucket_number;
|
|
|
308
|
|
|
309 if (EQ (XVECTOR_DATA (obarray)[hash], tem))
|
|
|
310 {
|
|
|
311 if (XSYMBOL (tem)->next)
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|
|
312 XSETSYMBOL (XVECTOR_DATA (obarray)[hash], XSYMBOL (tem)->next);
|
|
|
313 else
|
|
|
314 XVECTOR_DATA (obarray)[hash] = Qzero;
|
|
|
315 }
|
|
|
316 else
|
|
|
317 {
|
|
|
318 Lisp_Object tail, following;
|
|
|
319
|
|
|
320 for (tail = XVECTOR_DATA (obarray)[hash];
|
|
|
321 XSYMBOL (tail)->next;
|
|
|
322 tail = following)
|
|
|
323 {
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|
|
324 XSETSYMBOL (following, XSYMBOL (tail)->next);
|
|
|
325 if (EQ (following, tem))
|
|
|
326 {
|
|
|
327 XSYMBOL (tail)->next = XSYMBOL (following)->next;
|
|
|
328 break;
|
|
|
329 }
|
|
|
330 }
|
|
|
331 }
|
|
|
332 return Qt;
|
|
|
333 }
|
|
|
334
|
|
|
335 /* Return the symbol in OBARRAY whose names matches the string
|
|
|
336 of SIZE characters at PTR. If there is no such symbol in OBARRAY,
|
|
|
337 return the index into OBARRAY that the string hashes to.
|
|
|
338
|
|
|
339 Also store the bucket number in oblookup_last_bucket_number. */
|
|
|
340
|
|
|
341 Lisp_Object
|
|
442
|
342 oblookup (Lisp_Object obarray, const Bufbyte *ptr, Bytecount size)
|
|
428
|
343 {
|
|
|
344 int hash, obsize;
|
|
440
|
345 Lisp_Symbol *tail;
|
|
428
|
346 Lisp_Object bucket;
|
|
|
347
|
|
|
348 if (!VECTORP (obarray) ||
|
|
|
349 (obsize = XVECTOR_LENGTH (obarray)) == 0)
|
|
|
350 {
|
|
|
351 obarray = check_obarray (obarray);
|
|
|
352 obsize = XVECTOR_LENGTH (obarray);
|
|
|
353 }
|
|
|
354 hash = hash_string (ptr, size) % obsize;
|
|
|
355 oblookup_last_bucket_number = hash;
|
|
|
356 bucket = XVECTOR_DATA (obarray)[hash];
|
|
|
357 if (ZEROP (bucket))
|
|
|
358 ;
|
|
|
359 else if (!SYMBOLP (bucket))
|
|
|
360 error ("Bad data in guts of obarray"); /* Like CADR error message */
|
|
|
361 else
|
|
|
362 for (tail = XSYMBOL (bucket); ;)
|
|
|
363 {
|
|
|
364 if (string_length (tail->name) == size &&
|
|
|
365 !memcmp (string_data (tail->name), ptr, size))
|
|
|
366 {
|
|
|
367 XSETSYMBOL (bucket, tail);
|
|
|
368 return bucket;
|
|
|
369 }
|
|
|
370 tail = symbol_next (tail);
|
|
|
371 if (!tail)
|
|
|
372 break;
|
|
|
373 }
|
|
|
374 return make_int (hash);
|
|
|
375 }
|
|
|
376
|
|
|
377 #if 0 /* Emacs 19.34 */
|
|
|
378 int
|
|
442
|
379 hash_string (const Bufbyte *ptr, Bytecount len)
|
|
428
|
380 {
|
|
442
|
381 const Bufbyte *p = ptr;
|
|
|
382 const Bufbyte *end = p + len;
|
|
428
|
383 Bufbyte c;
|
|
|
384 int hash = 0;
|
|
|
385
|
|
|
386 while (p != end)
|
|
|
387 {
|
|
|
388 c = *p++;
|
|
|
389 if (c >= 0140) c -= 40;
|
|
|
390 hash = ((hash<<3) + (hash>>28) + c);
|
|
|
391 }
|
|
|
392 return hash & 07777777777;
|
|
|
393 }
|
|
|
394 #endif
|
|
|
395
|
|
|
396 /* derived from hashpjw, Dragon Book P436. */
|
|
|
397 int
|
|
442
|
398 hash_string (const Bufbyte *ptr, Bytecount len)
|
|
428
|
399 {
|
|
|
400 int hash = 0;
|
|
|
401
|
|
|
402 while (len-- > 0)
|
|
|
403 {
|
|
|
404 int g;
|
|
|
405 hash = (hash << 4) + *ptr++;
|
|
|
406 g = hash & 0xf0000000;
|
|
|
407 if (g)
|
|
|
408 hash = (hash ^ (g >> 24)) ^ g;
|
|
|
409 }
|
|
|
410 return hash & 07777777777;
|
|
|
411 }
|
|
|
412
|
|
|
413 /* Map FN over OBARRAY. The mapping is stopped when FN returns a
|
|
|
414 non-zero value. */
|
|
|
415 void
|
|
|
416 map_obarray (Lisp_Object obarray,
|
|
|
417 int (*fn) (Lisp_Object, void *), void *arg)
|
|
|
418 {
|
|
|
419 REGISTER int i;
|
|
|
420
|
|
|
421 CHECK_VECTOR (obarray);
|
|
|
422 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--)
|
|
|
423 {
|
|
|
424 Lisp_Object tail = XVECTOR_DATA (obarray)[i];
|
|
|
425 if (SYMBOLP (tail))
|
|
|
426 while (1)
|
|
|
427 {
|
|
440
|
428 Lisp_Symbol *next;
|
|
428
|
429 if ((*fn) (tail, arg))
|
|
|
430 return;
|
|
|
431 next = symbol_next (XSYMBOL (tail));
|
|
|
432 if (!next)
|
|
|
433 break;
|
|
|
434 XSETSYMBOL (tail, next);
|
|
|
435 }
|
|
|
436 }
|
|
|
437 }
|
|
|
438
|
|
|
439 static int
|
|
|
440 mapatoms_1 (Lisp_Object sym, void *arg)
|
|
|
441 {
|
|
|
442 call1 (*(Lisp_Object *)arg, sym);
|
|
|
443 return 0;
|
|
|
444 }
|
|
|
445
|
|
|
446 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /*
|
|
|
447 Call FUNCTION on every symbol in OBARRAY.
|
|
|
448 OBARRAY defaults to the value of `obarray'.
|
|
|
449 */
|
|
|
450 (function, obarray))
|
|
|
451 {
|
|
442
|
452 struct gcpro gcpro1;
|
|
|
453
|
|
428
|
454 if (NILP (obarray))
|
|
|
455 obarray = Vobarray;
|
|
|
456 obarray = check_obarray (obarray);
|
|
|
457
|
|
442
|
458 GCPRO1 (obarray);
|
|
428
|
459 map_obarray (obarray, mapatoms_1, &function);
|
|
442
|
460 UNGCPRO;
|
|
428
|
461 return Qnil;
|
|
|
462 }
|
|
|
463
|
|
|
464
|
|
|
465 /**********************************************************************/
|
|
|
466 /* Apropos */
|
|
|
467 /**********************************************************************/
|
|
|
468
|
|
|
469 struct appropos_mapper_closure
|
|
|
470 {
|
|
|
471 Lisp_Object regexp;
|
|
|
472 Lisp_Object predicate;
|
|
|
473 Lisp_Object accumulation;
|
|
|
474 };
|
|
|
475
|
|
|
476 static int
|
|
|
477 apropos_mapper (Lisp_Object symbol, void *arg)
|
|
|
478 {
|
|
|
479 struct appropos_mapper_closure *closure =
|
|
|
480 (struct appropos_mapper_closure *) arg;
|
|
|
481 Bytecount match = fast_lisp_string_match (closure->regexp,
|
|
|
482 Fsymbol_name (symbol));
|
|
|
483
|
|
|
484 if (match >= 0 &&
|
|
|
485 (NILP (closure->predicate) ||
|
|
|
486 !NILP (call1 (closure->predicate, symbol))))
|
|
|
487 closure->accumulation = Fcons (symbol, closure->accumulation);
|
|
|
488
|
|
|
489 return 0;
|
|
|
490 }
|
|
|
491
|
|
|
492 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /*
|
|
444
|
493 Return a list of all symbols whose names contain match for REGEXP.
|
|
|
494 If optional 2nd arg PREDICATE is non-nil, only symbols for which
|
|
|
495 \(funcall PREDICATE SYMBOL) returns non-nil are returned.
|
|
428
|
496 */
|
|
|
497 (regexp, predicate))
|
|
|
498 {
|
|
|
499 struct appropos_mapper_closure closure;
|
|
442
|
500 struct gcpro gcpro1;
|
|
428
|
501
|
|
|
502 CHECK_STRING (regexp);
|
|
|
503
|
|
|
504 closure.regexp = regexp;
|
|
|
505 closure.predicate = predicate;
|
|
|
506 closure.accumulation = Qnil;
|
|
442
|
507 GCPRO1 (closure.accumulation);
|
|
428
|
508 map_obarray (Vobarray, apropos_mapper, &closure);
|
|
|
509 closure.accumulation = Fsort (closure.accumulation, Qstring_lessp);
|
|
442
|
510 UNGCPRO;
|
|
428
|
511 return closure.accumulation;
|
|
|
512 }
|
|
|
513
|
|
|
514
|
|
|
515 /* Extract and set components of symbols */
|
|
|
516
|
|
|
517 static void set_up_buffer_local_cache (Lisp_Object sym,
|
|
|
518 struct symbol_value_buffer_local *bfwd,
|
|
|
519 struct buffer *buf,
|
|
|
520 Lisp_Object new_alist_el,
|
|
|
521 int set_it_p);
|
|
|
522
|
|
|
523 DEFUN ("boundp", Fboundp, 1, 1, 0, /*
|
|
|
524 Return t if SYMBOL's value is not void.
|
|
|
525 */
|
|
|
526 (symbol))
|
|
|
527 {
|
|
|
528 CHECK_SYMBOL (symbol);
|
|
|
529 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt;
|
|
|
530 }
|
|
|
531
|
|
|
532 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /*
|
|
|
533 Return t if SYMBOL has a global (non-bound) value.
|
|
|
534 This is for the byte-compiler; you really shouldn't be using this.
|
|
|
535 */
|
|
|
536 (symbol))
|
|
|
537 {
|
|
|
538 CHECK_SYMBOL (symbol);
|
|
|
539 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt;
|
|
|
540 }
|
|
|
541
|
|
|
542 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /*
|
|
|
543 Return t if SYMBOL's function definition is not void.
|
|
|
544 */
|
|
|
545 (symbol))
|
|
|
546 {
|
|
|
547 CHECK_SYMBOL (symbol);
|
|
|
548 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt;
|
|
|
549 }
|
|
|
550
|
|
|
551 /* Return non-zero if SYM's value or function (the current contents of
|
|
|
552 which should be passed in as VAL) is constant, i.e. unsettable. */
|
|
|
553
|
|
|
554 static int
|
|
|
555 symbol_is_constant (Lisp_Object sym, Lisp_Object val)
|
|
|
556 {
|
|
|
557 /* #### - I wonder if it would be better to just have a new magic value
|
|
|
558 type and make nil, t, and all keywords have that same magic
|
|
|
559 constant_symbol value. This test is awfully specific about what is
|
|
|
560 constant and what isn't. --Stig */
|
|
|
561 if (EQ (sym, Qnil) ||
|
|
|
562 EQ (sym, Qt))
|
|
|
563 return 1;
|
|
|
564
|
|
|
565 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
566 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
567 {
|
|
|
568 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
569 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
570 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
571 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
572 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
573 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
574 return 1;
|
|
|
575 default: break; /* Warning suppression */
|
|
|
576 }
|
|
|
577
|
|
|
578 /* We don't return true for keywords here because they are handled
|
|
|
579 specially by reject_constant_symbols(). */
|
|
|
580 return 0;
|
|
|
581 }
|
|
|
582
|
|
|
583 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is
|
|
|
584 non-zero) to NEWVAL. Make sure this is allowed.
|
|
|
585 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past
|
|
|
586 symbol-value-lisp-magic objects. */
|
|
|
587
|
|
|
588 void
|
|
|
589 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p,
|
|
|
590 Lisp_Object follow_past_lisp_magic)
|
|
|
591 {
|
|
|
592 Lisp_Object val =
|
|
|
593 (function_p ? XSYMBOL (sym)->function
|
|
|
594 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic));
|
|
|
595
|
|
|
596 if (SYMBOL_VALUE_MAGIC_P (val) &&
|
|
|
597 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD)
|
|
|
598 signal_simple_error ("Use `set-specifier' to change a specifier's value",
|
|
|
599 sym);
|
|
|
600
|
|
|
601 if (symbol_is_constant (sym, val)
|
|
|
602 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)))
|
|
|
603 signal_error (Qsetting_constant,
|
|
|
604 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval));
|
|
|
605 }
|
|
|
606
|
|
|
607 /* Verify that it's ok to make SYM buffer-local. This rejects
|
|
|
608 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC
|
|
|
609 specifies whether we delve into symbol-value-lisp-magic objects.
|
|
|
610 (Should be a symbol indicating what action is being taken; that way,
|
|
|
611 we don't delve if there's a handler for that action, but do otherwise.) */
|
|
|
612
|
|
|
613 static void
|
|
|
614 verify_ok_for_buffer_local (Lisp_Object sym,
|
|
|
615 Lisp_Object follow_past_lisp_magic)
|
|
|
616 {
|
|
|
617 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic);
|
|
|
618
|
|
|
619 if (symbol_is_constant (sym, val))
|
|
|
620 goto not_ok;
|
|
|
621 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
622 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
623 {
|
|
|
624 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
625 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
626 /* #### It's theoretically possible for it to be reasonable
|
|
|
627 to have both console-local and buffer-local variables,
|
|
|
628 but I don't want to consider that right now. */
|
|
|
629 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
630 goto not_ok;
|
|
|
631 default: break; /* Warning suppression */
|
|
|
632 }
|
|
|
633
|
|
|
634 return;
|
|
|
635
|
|
|
636 not_ok:
|
|
|
637 signal_error (Qerror,
|
|
|
638 list2 (build_string ("Symbol may not be buffer-local"), sym));
|
|
|
639 }
|
|
|
640
|
|
|
641 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /*
|
|
|
642 Make SYMBOL's value be void.
|
|
|
643 */
|
|
|
644 (symbol))
|
|
|
645 {
|
|
|
646 Fset (symbol, Qunbound);
|
|
|
647 return symbol;
|
|
|
648 }
|
|
|
649
|
|
|
650 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /*
|
|
|
651 Make SYMBOL's function definition be void.
|
|
|
652 */
|
|
|
653 (symbol))
|
|
|
654 {
|
|
|
655 CHECK_SYMBOL (symbol);
|
|
|
656 reject_constant_symbols (symbol, Qunbound, 1, Qt);
|
|
|
657 XSYMBOL (symbol)->function = Qunbound;
|
|
|
658 return symbol;
|
|
|
659 }
|
|
|
660
|
|
|
661 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /*
|
|
|
662 Return SYMBOL's function definition. Error if that is void.
|
|
|
663 */
|
|
|
664 (symbol))
|
|
|
665 {
|
|
|
666 CHECK_SYMBOL (symbol);
|
|
|
667 if (UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
668 signal_void_function_error (symbol);
|
|
|
669 return XSYMBOL (symbol)->function;
|
|
|
670 }
|
|
|
671
|
|
|
672 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /*
|
|
|
673 Return SYMBOL's property list.
|
|
|
674 */
|
|
|
675 (symbol))
|
|
|
676 {
|
|
|
677 CHECK_SYMBOL (symbol);
|
|
|
678 return XSYMBOL (symbol)->plist;
|
|
|
679 }
|
|
|
680
|
|
|
681 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /*
|
|
|
682 Return SYMBOL's name, a string.
|
|
|
683 */
|
|
|
684 (symbol))
|
|
|
685 {
|
|
|
686 Lisp_Object name;
|
|
|
687
|
|
|
688 CHECK_SYMBOL (symbol);
|
|
|
689 XSETSTRING (name, XSYMBOL (symbol)->name);
|
|
|
690 return name;
|
|
|
691 }
|
|
|
692
|
|
|
693 DEFUN ("fset", Ffset, 2, 2, 0, /*
|
|
|
694 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
|
695 */
|
|
|
696 (symbol, newdef))
|
|
|
697 {
|
|
|
698 /* This function can GC */
|
|
|
699 CHECK_SYMBOL (symbol);
|
|
|
700 reject_constant_symbols (symbol, newdef, 1, Qt);
|
|
|
701 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
702 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function),
|
|
|
703 Vautoload_queue);
|
|
|
704 XSYMBOL (symbol)->function = newdef;
|
|
|
705 /* Handle automatic advice activation */
|
|
|
706 if (CONSP (XSYMBOL (symbol)->plist) &&
|
|
|
707 !NILP (Fget (symbol, Qad_advice_info, Qnil)))
|
|
|
708 {
|
|
|
709 call2 (Qad_activate, symbol, Qnil);
|
|
|
710 newdef = XSYMBOL (symbol)->function;
|
|
|
711 }
|
|
|
712 return newdef;
|
|
|
713 }
|
|
|
714
|
|
|
715 /* FSFmacs */
|
|
|
716 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /*
|
|
|
717 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
|
718 Associates the function with the current load file, if any.
|
|
|
719 */
|
|
|
720 (symbol, newdef))
|
|
|
721 {
|
|
|
722 /* This function can GC */
|
|
|
723 Ffset (symbol, newdef);
|
|
|
724 LOADHIST_ATTACH (symbol);
|
|
|
725 return newdef;
|
|
|
726 }
|
|
|
727
|
|
|
728
|
|
|
729 DEFUN ("setplist", Fsetplist, 2, 2, 0, /*
|
|
|
730 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST.
|
|
|
731 */
|
|
|
732 (symbol, newplist))
|
|
|
733 {
|
|
|
734 CHECK_SYMBOL (symbol);
|
|
|
735 #if 0 /* Inserted for debugging 6/28/1997 -slb */
|
|
|
736 /* Somebody is setting a property list of integer 0, who? */
|
|
|
737 /* Not this way apparently. */
|
|
|
738 if (EQ(newplist, Qzero)) abort();
|
|
|
739 #endif
|
|
|
740
|
|
|
741 XSYMBOL (symbol)->plist = newplist;
|
|
|
742 return newplist;
|
|
|
743 }
|
|
|
744
|
|
|
745
|
|
|
746 /**********************************************************************/
|
|
|
747 /* symbol-value */
|
|
|
748 /**********************************************************************/
|
|
|
749
|
|
|
750 /* If the contents of the value cell of a symbol is one of the following
|
|
|
751 three types of objects, then the symbol is "magic" in that setting
|
|
|
752 and retrieving its value doesn't just set or retrieve the raw
|
|
|
753 contents of the value cell. None of these objects can escape to
|
|
|
754 the user level, so there is no loss of generality.
|
|
|
755
|
|
|
756 If a symbol is "unbound", then the contents of its value cell is
|
|
|
757 Qunbound. Despite appearances, this is *not* a symbol, but is a
|
|
|
758 symbol-value-forward object. This is so that printing it results
|
|
|
759 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow.
|
|
|
760
|
|
|
761 Logically all of the following objects are "symbol-value-magic"
|
|
|
762 objects, and there are some games played w.r.t. this (#### this
|
|
|
763 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of
|
|
|
764 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of
|
|
|
765 symbol-value-magic object. There are more than three types
|
|
|
766 returned by this macro: in particular, symbol-value-forward
|
|
|
767 has eight subtypes, and symbol-value-buffer-local has two. See
|
|
|
768 symeval.h.
|
|
|
769
|
|
|
770 1. symbol-value-forward
|
|
|
771
|
|
|
772 symbol-value-forward is used for variables whose actual contents
|
|
|
773 are stored in a C variable of some sort, and for Qunbound. The
|
|
|
774 lcheader.next field (which is only used to chain together free
|
|
|
775 lcrecords) holds a pointer to the actual C variable. Included
|
|
|
776 in this type are "buffer-local" variables that are actually
|
|
|
777 stored in the buffer object itself; in this case, the "pointer"
|
|
|
778 is an offset into the struct buffer structure.
|
|
|
779
|
|
|
780 The subtypes are as follows:
|
|
|
781
|
|
|
782 SYMVAL_OBJECT_FORWARD:
|
|
|
783 (declare with DEFVAR_LISP)
|
|
|
784 The value of this variable is stored in a C variable of type
|
|
|
785 "Lisp_Object". Setting this variable sets the C variable.
|
|
|
786 Accessing this variable retrieves a value from the C variable.
|
|
|
787 These variables can be buffer-local -- in this case, the
|
|
|
788 raw symbol-value field gets converted into a
|
|
|
789 symbol-value-buffer-local, whose "current_value" slot contains
|
|
|
790 the symbol-value-forward. (See below.)
|
|
|
791
|
|
|
792 SYMVAL_FIXNUM_FORWARD:
|
|
|
793 SYMVAL_BOOLEAN_FORWARD:
|
|
|
794 (declare with DEFVAR_INT or DEFVAR_BOOL)
|
|
|
795 Similar to SYMVAL_OBJECT_FORWARD except that the C variable
|
|
|
796 is of type "int" and is an integer or boolean, respectively.
|
|
|
797
|
|
|
798 SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
799 SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
800 SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
801 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or
|
|
|
802 DEFVAR_CONST_BOOL)
|
|
|
803 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or
|
|
|
804 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot
|
|
|
805 be changed.
|
|
|
806
|
|
|
807 SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
808 (declare with DEFVAR_SPECIFIER)
|
|
440
|
809 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that the error
|
|
|
810 message you get when attempting to set the value says to use
|
|
428
|
811 `set-specifier' instead.
|
|
|
812
|
|
|
813 SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
814 (declare with DEFVAR_BUFFER_LOCAL)
|
|
|
815 This is used for built-in buffer-local variables -- i.e.
|
|
|
816 Lisp variables whose value is stored in the "struct buffer".
|
|
|
817 Variables of this sort always forward into C "Lisp_Object"
|
|
|
818 fields (although there's no reason in principle that other
|
|
|
819 types for ints and booleans couldn't be added). Note that
|
|
|
820 some of these variables are automatically local in each
|
|
|
821 buffer, while some are only local when they become set
|
|
|
822 (similar to `make-variable-buffer-local'). In these latter
|
|
|
823 cases, of course, the default value shows through in all
|
|
|
824 buffers in which the variable doesn't have a local value.
|
|
|
825 This is implemented by making sure the "struct buffer" field
|
|
|
826 always contains the correct value (whether it's local or
|
|
|
827 a default) and maintaining a mask in the "struct buffer"
|
|
|
828 indicating which fields are local. When `set-default' is
|
|
|
829 called on a variable that's not always local to all buffers,
|
|
|
830 it loops through each buffer and sets the corresponding
|
|
|
831 field in each buffer without a local value for the field,
|
|
|
832 according to the mask.
|
|
|
833
|
|
|
834 Calling `make-local-variable' on a variable of this sort
|
|
|
835 only has the effect of maybe changing the current buffer's mask.
|
|
|
836 Calling `make-variable-buffer-local' on a variable of this
|
|
|
837 sort has no effect at all.
|
|
|
838
|
|
|
839 SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
840 (declare with DEFVAR_CONST_BUFFER_LOCAL)
|
|
|
841 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the
|
|
|
842 value cannot be set.
|
|
|
843
|
|
|
844 SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
845 (declare with DEFVAR_BUFFER_DEFAULTS)
|
|
|
846 This is used for the Lisp variables that contain the
|
|
|
847 default values of built-in buffer-local variables. Setting
|
|
|
848 or referencing one of these variables forwards into a slot
|
|
|
849 in the special struct buffer Vbuffer_defaults.
|
|
|
850
|
|
|
851 SYMVAL_UNBOUND_MARKER:
|
|
|
852 This is used for only one object, Qunbound.
|
|
|
853
|
|
|
854 SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
855 (declare with DEFVAR_CONSOLE_LOCAL)
|
|
|
856 This is used for built-in console-local variables -- i.e.
|
|
|
857 Lisp variables whose value is stored in the "struct console".
|
|
|
858 These work just like built-in buffer-local variables.
|
|
|
859 However, calling `make-local-variable' or
|
|
|
860 `make-variable-buffer-local' on one of these variables
|
|
|
861 is currently disallowed because that would entail having
|
|
|
862 both console-local and buffer-local variables, which is
|
|
|
863 trickier to implement.
|
|
|
864
|
|
|
865 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
866 (declare with DEFVAR_CONST_CONSOLE_LOCAL)
|
|
|
867 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the
|
|
|
868 value cannot be set.
|
|
|
869
|
|
|
870 SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
871 (declare with DEFVAR_CONSOLE_DEFAULTS)
|
|
|
872 This is used for the Lisp variables that contain the
|
|
|
873 default values of built-in console-local variables. Setting
|
|
|
874 or referencing one of these variables forwards into a slot
|
|
|
875 in the special struct console Vconsole_defaults.
|
|
|
876
|
|
|
877
|
|
|
878 2. symbol-value-buffer-local
|
|
|
879
|
|
|
880 symbol-value-buffer-local is used for variables that have had
|
|
|
881 `make-local-variable' or `make-variable-buffer-local' applied
|
|
|
882 to them. This object contains an alist mapping buffers to
|
|
|
883 values. In addition, the object contains a "current value",
|
|
|
884 which is the value in some buffer. Whenever you access the
|
|
|
885 variable with `symbol-value' or set it with `set' or `setq',
|
|
|
886 things are switched around so that the "current value"
|
|
|
887 refers to the current buffer, if it wasn't already. This
|
|
|
888 way, repeated references to a variable in the same buffer
|
|
|
889 are almost as efficient as if the variable weren't buffer
|
|
|
890 local. Note that the alist may not be up-to-date w.r.t.
|
|
|
891 the buffer whose value is current, as the "current value"
|
|
|
892 cache is normally only flushed into the alist when the
|
|
|
893 buffer it refers to changes.
|
|
|
894
|
|
|
895 Note also that it is possible for `make-local-variable'
|
|
|
896 or `make-variable-buffer-local' to be called on a variable
|
|
|
897 that forwards into a C variable (i.e. a variable whose
|
|
|
898 value cell is a symbol-value-forward). In this case,
|
|
|
899 the value cell becomes a symbol-value-buffer-local (as
|
|
|
900 always), and the symbol-value-forward moves into
|
|
|
901 the "current value" cell in this object. Also, in
|
|
|
902 this case the "current value" *always* refers to the
|
|
|
903 current buffer, so that the values of the C variable
|
|
|
904 always is the correct value for the current buffer.
|
|
|
905 set_buffer_internal() automatically updates the current-value
|
|
|
906 cells of all buffer-local variables that forward into C
|
|
|
907 variables. (There is a list of all buffer-local variables
|
|
|
908 that is maintained for this and other purposes.)
|
|
|
909
|
|
|
910 Note that only certain types of `symbol-value-forward' objects
|
|
|
911 can find their way into the "current value" cell of a
|
|
|
912 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD,
|
|
|
913 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and
|
|
|
914 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot
|
|
|
915 be buffer-local because they are unsettable;
|
|
|
916 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that
|
|
|
917 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local
|
|
|
918 does not have much of an effect (it's already buffer-local); and
|
|
|
919 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because
|
|
|
920 that's not currently implemented.
|
|
|
921
|
|
|
922
|
|
|
923 3. symbol-value-varalias
|
|
|
924
|
|
|
925 A symbol-value-varalias object is used for variables that
|
|
|
926 are aliases for other variables. This object contains
|
|
|
927 the symbol that this variable is aliased to.
|
|
|
928 symbol-value-varalias objects cannot occur anywhere within
|
|
|
929 a symbol-value-buffer-local object, and most of the
|
|
|
930 low-level functions below do not accept them; you need
|
|
|
931 to call follow_varalias_pointers to get the actual
|
|
|
932 symbol to operate on. */
|
|
|
933
|
|
|
934 static Lisp_Object
|
|
|
935 mark_symbol_value_buffer_local (Lisp_Object obj)
|
|
|
936 {
|
|
|
937 struct symbol_value_buffer_local *bfwd;
|
|
|
938
|
|
|
939 #ifdef ERROR_CHECK_TYPECHECK
|
|
|
940 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL ||
|
|
|
941 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
942 #endif
|
|
|
943
|
|
|
944 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj);
|
|
|
945 mark_object (bfwd->default_value);
|
|
|
946 mark_object (bfwd->current_value);
|
|
|
947 mark_object (bfwd->current_buffer);
|
|
|
948 return bfwd->current_alist_element;
|
|
|
949 }
|
|
|
950
|
|
|
951 static Lisp_Object
|
|
|
952 mark_symbol_value_lisp_magic (Lisp_Object obj)
|
|
|
953 {
|
|
|
954 struct symbol_value_lisp_magic *bfwd;
|
|
|
955 int i;
|
|
|
956
|
|
|
957 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC);
|
|
|
958
|
|
|
959 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj);
|
|
|
960 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
961 {
|
|
|
962 mark_object (bfwd->handler[i]);
|
|
|
963 mark_object (bfwd->harg[i]);
|
|
|
964 }
|
|
|
965 return bfwd->shadowed;
|
|
|
966 }
|
|
|
967
|
|
|
968 static Lisp_Object
|
|
|
969 mark_symbol_value_varalias (Lisp_Object obj)
|
|
|
970 {
|
|
|
971 struct symbol_value_varalias *bfwd;
|
|
|
972
|
|
|
973 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS);
|
|
|
974
|
|
|
975 bfwd = XSYMBOL_VALUE_VARALIAS (obj);
|
|
|
976 mark_object (bfwd->shadowed);
|
|
|
977 return bfwd->aliasee;
|
|
|
978 }
|
|
|
979
|
|
|
980 /* Should never, ever be called. (except by an external debugger) */
|
|
|
981 void
|
|
|
982 print_symbol_value_magic (Lisp_Object obj,
|
|
|
983 Lisp_Object printcharfun, int escapeflag)
|
|
|
984 {
|
|
|
985 char buf[200];
|
|
|
986 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%lx>",
|
|
|
987 XRECORD_LHEADER_IMPLEMENTATION (obj)->name,
|
|
|
988 XSYMBOL_VALUE_MAGIC_TYPE (obj),
|
|
|
989 (long) XPNTR (obj));
|
|
|
990 write_c_string (buf, printcharfun);
|
|
|
991 }
|
|
|
992
|
|
|
993 static const struct lrecord_description symbol_value_forward_description[] = {
|
|
|
994 { XD_END }
|
|
|
995 };
|
|
|
996
|
|
|
997 static const struct lrecord_description symbol_value_buffer_local_description[] = {
|
|
440
|
998 { XD_LISP_OBJECT, offsetof (struct symbol_value_buffer_local, default_value) },
|
|
|
999 { XD_LO_RESET_NIL, offsetof (struct symbol_value_buffer_local, current_value), 3 },
|
|
428
|
1000 { XD_END }
|
|
|
1001 };
|
|
|
1002
|
|
|
1003 static const struct lrecord_description symbol_value_lisp_magic_description[] = {
|
|
440
|
1004 { XD_LISP_OBJECT_ARRAY, offsetof (struct symbol_value_lisp_magic, handler), 2*MAGIC_HANDLER_MAX+1 },
|
|
428
|
1005 { XD_END }
|
|
|
1006 };
|
|
|
1007
|
|
|
1008 static const struct lrecord_description symbol_value_varalias_description[] = {
|
|
440
|
1009 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, aliasee) },
|
|
|
1010 { XD_LISP_OBJECT, offsetof (struct symbol_value_varalias, shadowed) },
|
|
428
|
1011 { XD_END }
|
|
|
1012 };
|
|
|
1013
|
|
|
1014 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-forward",
|
|
|
1015 symbol_value_forward,
|
|
442
|
1016 0,
|
|
428
|
1017 print_symbol_value_magic, 0, 0, 0,
|
|
|
1018 symbol_value_forward_description,
|
|
|
1019 struct symbol_value_forward);
|
|
|
1020
|
|
|
1021 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-buffer-local",
|
|
|
1022 symbol_value_buffer_local,
|
|
|
1023 mark_symbol_value_buffer_local,
|
|
|
1024 print_symbol_value_magic, 0, 0, 0,
|
|
|
1025 symbol_value_buffer_local_description,
|
|
|
1026 struct symbol_value_buffer_local);
|
|
|
1027
|
|
|
1028 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-lisp-magic",
|
|
|
1029 symbol_value_lisp_magic,
|
|
|
1030 mark_symbol_value_lisp_magic,
|
|
|
1031 print_symbol_value_magic, 0, 0, 0,
|
|
|
1032 symbol_value_lisp_magic_description,
|
|
|
1033 struct symbol_value_lisp_magic);
|
|
|
1034
|
|
|
1035 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-varalias",
|
|
|
1036 symbol_value_varalias,
|
|
|
1037 mark_symbol_value_varalias,
|
|
|
1038 print_symbol_value_magic, 0, 0, 0,
|
|
|
1039 symbol_value_varalias_description,
|
|
|
1040 struct symbol_value_varalias);
|
|
|
1041
|
|
|
1042
|
|
|
1043 /* Getting and setting values of symbols */
|
|
|
1044
|
|
|
1045 /* Given the raw contents of a symbol value cell, return the Lisp value of
|
|
|
1046 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local,
|
|
|
1047 symbol-value-lisp-magic, or symbol-value-varalias.
|
|
|
1048
|
|
|
1049 BUFFER specifies a buffer, and is used for built-in buffer-local
|
|
|
1050 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD.
|
|
|
1051 Note that such variables are never encapsulated in a
|
|
|
1052 symbol-value-buffer-local structure.
|
|
|
1053
|
|
|
1054 CONSOLE specifies a console, and is used for built-in console-local
|
|
|
1055 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD.
|
|
|
1056 Note that such variables are (currently) never encapsulated in a
|
|
|
1057 symbol-value-buffer-local structure.
|
|
|
1058 */
|
|
|
1059
|
|
|
1060 static Lisp_Object
|
|
|
1061 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer,
|
|
|
1062 struct console *console)
|
|
|
1063 {
|
|
442
|
1064 const struct symbol_value_forward *fwd;
|
|
428
|
1065
|
|
|
1066 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1067 return valcontents;
|
|
|
1068
|
|
|
1069 fwd = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1070 switch (fwd->magic.type)
|
|
|
1071 {
|
|
|
1072 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1073 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
1074 return make_int (*((int *)symbol_value_forward_forward (fwd)));
|
|
|
1075
|
|
|
1076 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1077 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
1078 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil;
|
|
|
1079
|
|
|
1080 case SYMVAL_OBJECT_FORWARD:
|
|
|
1081 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
1082 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
1083 return *((Lisp_Object *)symbol_value_forward_forward (fwd));
|
|
|
1084
|
|
|
1085 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1086 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1087 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1088 - (char *)&buffer_local_flags))));
|
|
|
1089
|
|
|
1090
|
|
|
1091 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1092 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
1093 assert (buffer);
|
|
|
1094 return (*((Lisp_Object *)((char *)buffer
|
|
|
1095 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1096 - (char *)&buffer_local_flags))));
|
|
|
1097
|
|
|
1098 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1099 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1100 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1101 - (char *)&console_local_flags))));
|
|
|
1102
|
|
|
1103 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1104 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
1105 assert (console);
|
|
|
1106 return (*((Lisp_Object *)((char *)console
|
|
|
1107 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1108 - (char *)&console_local_flags))));
|
|
|
1109
|
|
|
1110 case SYMVAL_UNBOUND_MARKER:
|
|
|
1111 return valcontents;
|
|
|
1112
|
|
|
1113 default:
|
|
|
1114 abort ();
|
|
|
1115 }
|
|
|
1116 return Qnil; /* suppress compiler warning */
|
|
|
1117 }
|
|
|
1118
|
|
|
1119 /* Set the value of default-buffer-local variable SYM to VALUE. */
|
|
|
1120
|
|
|
1121 static void
|
|
|
1122 set_default_buffer_slot_variable (Lisp_Object sym,
|
|
|
1123 Lisp_Object value)
|
|
|
1124 {
|
|
|
1125 /* Handle variables like case-fold-search that have special slots in
|
|
|
1126 the buffer. Make them work apparently like buffer_local variables.
|
|
|
1127 */
|
|
|
1128 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1129 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1130 have already called it. */
|
|
|
1131 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
442
|
1132 const struct symbol_value_forward *fwd
|
|
428
|
1133 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1134 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
1135 - (char *) &buffer_local_flags);
|
|
|
1136 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1137 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1138 int flags) = symbol_value_forward_magicfun (fwd);
|
|
|
1139
|
|
|
1140 *((Lisp_Object *) (offset + (char *) XBUFFER (Vbuffer_defaults)))
|
|
|
1141 = value;
|
|
|
1142
|
|
|
1143 if (mask > 0) /* Not always per-buffer */
|
|
|
1144 {
|
|
|
1145 /* Set value in each buffer which hasn't shadowed the default */
|
|
|
1146 LIST_LOOP_2 (elt, Vbuffer_alist)
|
|
|
1147 {
|
|
|
1148 struct buffer *b = XBUFFER (XCDR (elt));
|
|
|
1149 if (!(b->local_var_flags & mask))
|
|
|
1150 {
|
|
|
1151 if (magicfun)
|
|
|
1152 magicfun (sym, &value, make_buffer (b), 0);
|
|
|
1153 *((Lisp_Object *) (offset + (char *) b)) = value;
|
|
|
1154 }
|
|
|
1155 }
|
|
|
1156 }
|
|
|
1157 }
|
|
|
1158
|
|
|
1159 /* Set the value of default-console-local variable SYM to VALUE. */
|
|
|
1160
|
|
|
1161 static void
|
|
|
1162 set_default_console_slot_variable (Lisp_Object sym,
|
|
|
1163 Lisp_Object value)
|
|
|
1164 {
|
|
|
1165 /* Handle variables like case-fold-search that have special slots in
|
|
|
1166 the console. Make them work apparently like console_local variables.
|
|
|
1167 */
|
|
|
1168 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1169 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1170 have already called it. */
|
|
|
1171 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
442
|
1172 const struct symbol_value_forward *fwd
|
|
428
|
1173 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1174 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
1175 - (char *) &console_local_flags);
|
|
|
1176 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1177 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1178 int flags) = symbol_value_forward_magicfun (fwd);
|
|
|
1179
|
|
|
1180 *((Lisp_Object *) (offset + (char *) XCONSOLE (Vconsole_defaults)))
|
|
|
1181 = value;
|
|
|
1182
|
|
|
1183 if (mask > 0) /* Not always per-console */
|
|
|
1184 {
|
|
|
1185 /* Set value in each console which hasn't shadowed the default */
|
|
|
1186 LIST_LOOP_2 (console, Vconsole_list)
|
|
|
1187 {
|
|
|
1188 struct console *d = XCONSOLE (console);
|
|
|
1189 if (!(d->local_var_flags & mask))
|
|
|
1190 {
|
|
|
1191 if (magicfun)
|
|
|
1192 magicfun (sym, &value, console, 0);
|
|
|
1193 *((Lisp_Object *) (offset + (char *) d)) = value;
|
|
|
1194 }
|
|
|
1195 }
|
|
|
1196 }
|
|
|
1197 }
|
|
|
1198
|
|
|
1199 /* Store NEWVAL into SYM.
|
|
|
1200
|
|
|
1201 SYM's value slot may *not* be types (5) or (6) above,
|
|
|
1202 i.e. no symbol-value-varalias objects. (You should have
|
|
|
1203 forwarded past all of these.)
|
|
|
1204
|
|
|
1205 SYM should not be an unsettable symbol or a symbol with
|
|
|
1206 a magic `set-value' handler (unless you want to explicitly
|
|
|
1207 ignore this handler).
|
|
|
1208
|
|
|
1209 OVALUE is the current value of SYM, but forwarded past any
|
|
|
1210 symbol-value-buffer-local and symbol-value-lisp-magic objects.
|
|
|
1211 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be
|
|
|
1212 the contents of its current-value cell.) NEWVAL may only be
|
|
|
1213 a simple value or Qunbound. If SYM is a symbol-value-buffer-local,
|
|
|
1214 this function will only modify its current-value cell, which should
|
|
|
1215 already be set up to point to the current buffer.
|
|
|
1216 */
|
|
|
1217
|
|
|
1218 static void
|
|
|
1219 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue,
|
|
|
1220 Lisp_Object newval)
|
|
|
1221 {
|
|
|
1222 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue))
|
|
|
1223 {
|
|
|
1224 Lisp_Object *store_pointer = value_slot_past_magic (sym);
|
|
|
1225
|
|
|
1226 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer))
|
|
|
1227 store_pointer =
|
|
|
1228 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value;
|
|
|
1229
|
|
|
1230 assert (UNBOUNDP (*store_pointer)
|
|
|
1231 || !SYMBOL_VALUE_MAGIC_P (*store_pointer));
|
|
|
1232 *store_pointer = newval;
|
|
|
1233 }
|
|
|
1234 else
|
|
|
1235 {
|
|
442
|
1236 const struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue);
|
|
428
|
1237 int (*magicfun) (Lisp_Object simm, Lisp_Object *val,
|
|
|
1238 Lisp_Object in_object, int flags)
|
|
|
1239 = symbol_value_forward_magicfun (fwd);
|
|
|
1240
|
|
|
1241 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue))
|
|
|
1242 {
|
|
|
1243 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1244 CHECK_INT (newval);
|
|
|
1245 if (magicfun)
|
|
|
1246 magicfun (sym, &newval, Qnil, 0);
|
|
|
1247 *((int *) symbol_value_forward_forward (fwd)) = XINT (newval);
|
|
|
1248 return;
|
|
|
1249
|
|
|
1250 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1251 if (magicfun)
|
|
|
1252 magicfun (sym, &newval, Qnil, 0);
|
|
|
1253 *((int *) symbol_value_forward_forward (fwd))
|
|
|
1254 = !NILP (newval);
|
|
|
1255 return;
|
|
|
1256
|
|
|
1257 case SYMVAL_OBJECT_FORWARD:
|
|
|
1258 if (magicfun)
|
|
|
1259 magicfun (sym, &newval, Qnil, 0);
|
|
|
1260 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval;
|
|
|
1261 return;
|
|
|
1262
|
|
|
1263 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1264 set_default_buffer_slot_variable (sym, newval);
|
|
|
1265 return;
|
|
|
1266
|
|
|
1267 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1268 if (magicfun)
|
|
|
1269 magicfun (sym, &newval, make_buffer (current_buffer), 0);
|
|
|
1270 *((Lisp_Object *) ((char *) current_buffer
|
|
|
1271 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1272 - (char *) &buffer_local_flags)))
|
|
|
1273 = newval;
|
|
|
1274 return;
|
|
|
1275
|
|
|
1276 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1277 set_default_console_slot_variable (sym, newval);
|
|
|
1278 return;
|
|
|
1279
|
|
|
1280 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1281 if (magicfun)
|
|
|
1282 magicfun (sym, &newval, Vselected_console, 0);
|
|
|
1283 *((Lisp_Object *) ((char *) XCONSOLE (Vselected_console)
|
|
|
1284 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1285 - (char *) &console_local_flags)))
|
|
|
1286 = newval;
|
|
|
1287 return;
|
|
|
1288
|
|
|
1289 default:
|
|
|
1290 abort ();
|
|
|
1291 }
|
|
|
1292 }
|
|
|
1293 }
|
|
|
1294
|
|
|
1295 /* Given a per-buffer variable SYMBOL and its raw value-cell contents
|
|
|
1296 BFWD, locate and return a pointer to the element in BUFFER's
|
|
|
1297 local_var_alist for SYMBOL. The return value will be Qnil if
|
|
|
1298 BUFFER does not have its own value for SYMBOL (i.e. the default
|
|
|
1299 value is seen in that buffer).
|
|
|
1300 */
|
|
|
1301
|
|
|
1302 static Lisp_Object
|
|
|
1303 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol,
|
|
|
1304 struct symbol_value_buffer_local *bfwd)
|
|
|
1305 {
|
|
|
1306 if (!NILP (bfwd->current_buffer) &&
|
|
|
1307 XBUFFER (bfwd->current_buffer) == buffer)
|
|
|
1308 /* This is just an optimization of the below. */
|
|
|
1309 return bfwd->current_alist_element;
|
|
|
1310 else
|
|
|
1311 return assq_no_quit (symbol, buffer->local_var_alist);
|
|
|
1312 }
|
|
|
1313
|
|
|
1314 /* [Remember that the slot that mirrors CURRENT-VALUE in the
|
|
|
1315 symbol-value-buffer-local of a per-buffer variable -- i.e. the
|
|
|
1316 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE
|
|
|
1317 slot -- may be out of date.]
|
|
|
1318
|
|
|
1319 Write out any cached value in buffer-local variable SYMBOL's
|
|
|
1320 buffer-local structure, which is passed in as BFWD.
|
|
|
1321 */
|
|
|
1322
|
|
|
1323 static void
|
|
|
1324 write_out_buffer_local_cache (Lisp_Object symbol,
|
|
|
1325 struct symbol_value_buffer_local *bfwd)
|
|
|
1326 {
|
|
|
1327 if (!NILP (bfwd->current_buffer))
|
|
|
1328 {
|
|
|
1329 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD
|
|
|
1330 uses it, and that type cannot be inside a symbol-value-buffer-local */
|
|
|
1331 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0);
|
|
|
1332 if (NILP (bfwd->current_alist_element))
|
|
|
1333 /* current_value may be updated more recently than default_value */
|
|
|
1334 bfwd->default_value = cval;
|
|
|
1335 else
|
|
|
1336 Fsetcdr (bfwd->current_alist_element, cval);
|
|
|
1337 }
|
|
|
1338 }
|
|
|
1339
|
|
|
1340 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure.
|
|
|
1341 Set up BFWD's cache for validity in buffer BUF. This assumes that
|
|
|
1342 the cache is currently in a consistent state (this can include
|
|
|
1343 not having any value cached, if BFWD->CURRENT_BUFFER is nil).
|
|
|
1344
|
|
|
1345 If the cache is already set up for BUF, this function does nothing
|
|
|
1346 at all.
|
|
|
1347
|
|
|
1348 Otherwise, if SYM forwards out to a C variable, this also forwards
|
|
|
1349 SYM's value in BUF out to the variable. Therefore, you generally
|
|
|
1350 only want to call this when BUF is, or is about to become, the
|
|
|
1351 current buffer.
|
|
|
1352
|
|
|
1353 (Otherwise, you can just retrieve the value without changing the
|
|
|
1354 cache, at the expense of slower retrieval.)
|
|
|
1355 */
|
|
|
1356
|
|
|
1357 static void
|
|
|
1358 set_up_buffer_local_cache (Lisp_Object sym,
|
|
|
1359 struct symbol_value_buffer_local *bfwd,
|
|
|
1360 struct buffer *buf,
|
|
|
1361 Lisp_Object new_alist_el,
|
|
|
1362 int set_it_p)
|
|
|
1363 {
|
|
|
1364 Lisp_Object new_val;
|
|
|
1365
|
|
|
1366 if (!NILP (bfwd->current_buffer)
|
|
|
1367 && buf == XBUFFER (bfwd->current_buffer))
|
|
|
1368 /* Cache is already set up. */
|
|
|
1369 return;
|
|
|
1370
|
|
|
1371 /* Flush out the old cache. */
|
|
|
1372 write_out_buffer_local_cache (sym, bfwd);
|
|
|
1373
|
|
|
1374 /* Retrieve the new alist element and new value. */
|
|
|
1375 if (NILP (new_alist_el)
|
|
|
1376 && set_it_p)
|
|
|
1377 new_alist_el = buffer_local_alist_element (buf, sym, bfwd);
|
|
|
1378
|
|
|
1379 if (NILP (new_alist_el))
|
|
|
1380 new_val = bfwd->default_value;
|
|
|
1381 else
|
|
|
1382 new_val = Fcdr (new_alist_el);
|
|
|
1383
|
|
|
1384 bfwd->current_alist_element = new_alist_el;
|
|
|
1385 XSETBUFFER (bfwd->current_buffer, buf);
|
|
|
1386
|
|
|
1387 /* Now store the value into the current-value slot.
|
|
|
1388 We don't simply write it there, because the current-value
|
|
|
1389 slot might be a forwarding pointer, in which case we need
|
|
|
1390 to instead write the value into the C variable.
|
|
|
1391
|
|
|
1392 We might also want to call a magic function.
|
|
|
1393
|
|
|
1394 So instead, we call this function. */
|
|
|
1395 store_symval_forwarding (sym, bfwd->current_value, new_val);
|
|
|
1396 }
|
|
|
1397
|
|
|
1398
|
|
|
1399 void
|
|
|
1400 kill_buffer_local_variables (struct buffer *buf)
|
|
|
1401 {
|
|
|
1402 Lisp_Object prev = Qnil;
|
|
|
1403 Lisp_Object alist;
|
|
|
1404
|
|
|
1405 /* Any which are supposed to be permanent,
|
|
|
1406 make local again, with the same values they had. */
|
|
|
1407
|
|
|
1408 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist))
|
|
|
1409 {
|
|
|
1410 Lisp_Object sym = XCAR (XCAR (alist));
|
|
|
1411 struct symbol_value_buffer_local *bfwd;
|
|
|
1412 /* Variables with a symbol-value-varalias should not be here
|
|
|
1413 (we should have forwarded past them) and there must be a
|
|
|
1414 symbol-value-buffer-local. If there's a symbol-value-lisp-magic,
|
|
|
1415 just forward past it; if the variable has a handler, it was
|
|
|
1416 already called. */
|
|
|
1417 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt);
|
|
|
1418
|
|
|
1419 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value));
|
|
|
1420 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value);
|
|
|
1421
|
|
|
1422 if (!NILP (Fget (sym, Qpermanent_local, Qnil)))
|
|
|
1423 /* prev points to the last alist element that is still
|
|
|
1424 staying around, so *only* update it now. This didn't
|
|
|
1425 used to be the case; this bug has been around since
|
|
|
1426 mly's rewrite two years ago! */
|
|
|
1427 prev = alist;
|
|
|
1428 else
|
|
|
1429 {
|
|
|
1430 /* Really truly kill it. */
|
|
|
1431 if (!NILP (prev))
|
|
|
1432 XCDR (prev) = XCDR (alist);
|
|
|
1433 else
|
|
|
1434 buf->local_var_alist = XCDR (alist);
|
|
|
1435
|
|
|
1436 /* We just effectively changed the value for this variable
|
|
|
1437 in BUF. So: */
|
|
|
1438
|
|
|
1439 /* (1) If the cache is caching BUF, invalidate the cache. */
|
|
|
1440 if (!NILP (bfwd->current_buffer) &&
|
|
|
1441 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1442 bfwd->current_buffer = Qnil;
|
|
|
1443
|
|
|
1444 /* (2) If we changed the value in current_buffer and this
|
|
|
1445 variable forwards to a C variable, we need to change the
|
|
|
1446 value of the C variable. set_up_buffer_local_cache()
|
|
|
1447 will do this. It doesn't hurt to do it whenever
|
|
|
1448 BUF == current_buffer, so just go ahead and do that. */
|
|
|
1449 if (buf == current_buffer)
|
|
|
1450 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0);
|
|
|
1451 }
|
|
|
1452 }
|
|
|
1453 }
|
|
|
1454
|
|
|
1455 static Lisp_Object
|
|
|
1456 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf,
|
|
|
1457 struct console *con, int swap_it_in,
|
|
|
1458 Lisp_Object symcons, int set_it_p)
|
|
|
1459 {
|
|
|
1460 Lisp_Object valcontents;
|
|
|
1461
|
|
|
1462 retry:
|
|
|
1463 valcontents = XSYMBOL (sym)->value;
|
|
|
1464
|
|
|
1465 retry_2:
|
|
|
1466 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1467 return valcontents;
|
|
|
1468
|
|
|
1469 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1470 {
|
|
|
1471 case SYMVAL_LISP_MAGIC:
|
|
|
1472 /* #### kludge */
|
|
|
1473 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1474 /* semi-change-o */
|
|
|
1475 goto retry_2;
|
|
|
1476
|
|
|
1477 case SYMVAL_VARALIAS:
|
|
|
1478 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1479 symcons = Qnil;
|
|
|
1480 /* presto change-o! */
|
|
|
1481 goto retry;
|
|
|
1482
|
|
|
1483 case SYMVAL_BUFFER_LOCAL:
|
|
|
1484 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1485 {
|
|
|
1486 struct symbol_value_buffer_local *bfwd
|
|
|
1487 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1488
|
|
|
1489 if (swap_it_in)
|
|
|
1490 {
|
|
|
1491 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p);
|
|
|
1492 valcontents = bfwd->current_value;
|
|
|
1493 }
|
|
|
1494 else
|
|
|
1495 {
|
|
|
1496 if (!NILP (bfwd->current_buffer) &&
|
|
|
1497 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1498 valcontents = bfwd->current_value;
|
|
|
1499 else if (NILP (symcons))
|
|
|
1500 {
|
|
|
1501 if (set_it_p)
|
|
|
1502 valcontents = assq_no_quit (sym, buf->local_var_alist);
|
|
|
1503 if (NILP (valcontents))
|
|
|
1504 valcontents = bfwd->default_value;
|
|
|
1505 else
|
|
|
1506 valcontents = XCDR (valcontents);
|
|
|
1507 }
|
|
|
1508 else
|
|
|
1509 valcontents = XCDR (symcons);
|
|
|
1510 }
|
|
|
1511 break;
|
|
|
1512 }
|
|
|
1513
|
|
|
1514 default:
|
|
|
1515 break;
|
|
|
1516 }
|
|
|
1517 return do_symval_forwarding (valcontents, buf, con);
|
|
|
1518 }
|
|
|
1519
|
|
|
1520
|
|
|
1521 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not
|
|
|
1522 bound. Note that it must not be possible to QUIT within this
|
|
|
1523 function. */
|
|
|
1524
|
|
|
1525 Lisp_Object
|
|
|
1526 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer)
|
|
|
1527 {
|
|
|
1528 struct buffer *buf;
|
|
|
1529
|
|
|
1530 CHECK_SYMBOL (sym);
|
|
|
1531
|
|
|
1532 if (NILP (buffer))
|
|
|
1533 buf = current_buffer;
|
|
|
1534 else
|
|
|
1535 {
|
|
|
1536 CHECK_BUFFER (buffer);
|
|
|
1537 buf = XBUFFER (buffer);
|
|
|
1538 }
|
|
|
1539
|
|
|
1540 return find_symbol_value_1 (sym, buf,
|
|
|
1541 /* If it bombs out at startup due to a
|
|
|
1542 Lisp error, this may be nil. */
|
|
|
1543 CONSOLEP (Vselected_console)
|
|
|
1544 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1);
|
|
|
1545 }
|
|
|
1546
|
|
|
1547 static Lisp_Object
|
|
|
1548 symbol_value_in_console (Lisp_Object sym, Lisp_Object console)
|
|
|
1549 {
|
|
|
1550 CHECK_SYMBOL (sym);
|
|
|
1551
|
|
|
1552 if (NILP (console))
|
|
|
1553 console = Vselected_console;
|
|
|
1554 else
|
|
|
1555 CHECK_CONSOLE (console);
|
|
|
1556
|
|
|
1557 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0,
|
|
|
1558 Qnil, 1);
|
|
|
1559 }
|
|
|
1560
|
|
|
1561 /* Return the current value of SYM. The difference between this function
|
|
|
1562 and calling symbol_value_in_buffer with a BUFFER of Qnil is that
|
|
|
1563 this updates the CURRENT_VALUE slot of buffer-local variables to
|
|
|
1564 point to the current buffer, while symbol_value_in_buffer doesn't. */
|
|
|
1565
|
|
|
1566 Lisp_Object
|
|
|
1567 find_symbol_value (Lisp_Object sym)
|
|
|
1568 {
|
|
|
1569 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1570 and Vselected_console is Qnil, early in initialization. */
|
|
|
1571 struct console *con;
|
|
|
1572 Lisp_Object valcontents;
|
|
|
1573
|
|
|
1574 CHECK_SYMBOL (sym);
|
|
|
1575
|
|
|
1576 valcontents = XSYMBOL (sym)->value;
|
|
|
1577 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1578 return valcontents;
|
|
|
1579
|
|
|
1580 if (CONSOLEP (Vselected_console))
|
|
|
1581 con = XCONSOLE (Vselected_console);
|
|
|
1582 else
|
|
|
1583 {
|
|
|
1584 /* This can also get called while we're preparing to shutdown.
|
|
|
1585 #### What should really happen in that case? Should we
|
|
|
1586 actually fix things so we can't get here in that case? */
|
|
|
1587 #ifndef PDUMP
|
|
|
1588 assert (!initialized || preparing_for_armageddon);
|
|
|
1589 #endif
|
|
|
1590 con = 0;
|
|
|
1591 }
|
|
|
1592
|
|
|
1593 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1);
|
|
|
1594 }
|
|
|
1595
|
|
|
1596 /* This is an optimized function for quick lookup of buffer local symbols
|
|
|
1597 by avoiding O(n) search. This will work when either:
|
|
|
1598 a) We have already found the symbol e.g. by traversing local_var_alist.
|
|
|
1599 or
|
|
|
1600 b) We know that the symbol will not be found in the current buffer's
|
|
|
1601 list of local variables.
|
|
|
1602 In the former case, find_it_p is 1 and symbol_cons is the element from
|
|
|
1603 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons
|
|
|
1604 is the symbol.
|
|
|
1605
|
|
|
1606 This function is called from set_buffer_internal which does both of these
|
|
|
1607 things. */
|
|
|
1608
|
|
|
1609 Lisp_Object
|
|
|
1610 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p)
|
|
|
1611 {
|
|
|
1612 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1613 and Vselected_console is Qnil, early in initialization. */
|
|
|
1614 struct console *con;
|
|
|
1615 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons;
|
|
|
1616
|
|
|
1617 CHECK_SYMBOL (sym);
|
|
|
1618 if (CONSOLEP (Vselected_console))
|
|
|
1619 con = XCONSOLE (Vselected_console);
|
|
|
1620 else
|
|
|
1621 {
|
|
|
1622 /* This can also get called while we're preparing to shutdown.
|
|
|
1623 #### What should really happen in that case? Should we
|
|
|
1624 actually fix things so we can't get here in that case? */
|
|
|
1625 #ifndef PDUMP
|
|
|
1626 assert (!initialized || preparing_for_armageddon);
|
|
|
1627 #endif
|
|
|
1628 con = 0;
|
|
|
1629 }
|
|
|
1630
|
|
|
1631 return find_symbol_value_1 (sym, current_buffer, con, 1,
|
|
|
1632 find_it_p ? symbol_cons : Qnil,
|
|
|
1633 find_it_p);
|
|
|
1634 }
|
|
|
1635
|
|
|
1636 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /*
|
|
|
1637 Return SYMBOL's value. Error if that is void.
|
|
|
1638 */
|
|
|
1639 (symbol))
|
|
|
1640 {
|
|
|
1641 Lisp_Object val = find_symbol_value (symbol);
|
|
|
1642
|
|
|
1643 if (UNBOUNDP (val))
|
|
|
1644 return Fsignal (Qvoid_variable, list1 (symbol));
|
|
|
1645 else
|
|
|
1646 return val;
|
|
|
1647 }
|
|
|
1648
|
|
|
1649 DEFUN ("set", Fset, 2, 2, 0, /*
|
|
|
1650 Set SYMBOL's value to NEWVAL, and return NEWVAL.
|
|
|
1651 */
|
|
|
1652 (symbol, newval))
|
|
|
1653 {
|
|
|
1654 REGISTER Lisp_Object valcontents;
|
|
440
|
1655 Lisp_Symbol *sym;
|
|
428
|
1656 /* remember, we're called by Fmakunbound() as well */
|
|
|
1657
|
|
|
1658 CHECK_SYMBOL (symbol);
|
|
|
1659
|
|
|
1660 retry:
|
|
|
1661 sym = XSYMBOL (symbol);
|
|
|
1662 valcontents = sym->value;
|
|
|
1663
|
|
|
1664 if (EQ (symbol, Qnil) ||
|
|
|
1665 EQ (symbol, Qt) ||
|
|
|
1666 SYMBOL_IS_KEYWORD (symbol))
|
|
|
1667 reject_constant_symbols (symbol, newval, 0,
|
|
|
1668 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1669
|
|
|
1670 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents))
|
|
|
1671 {
|
|
|
1672 sym->value = newval;
|
|
|
1673 return newval;
|
|
|
1674 }
|
|
|
1675
|
|
|
1676 reject_constant_symbols (symbol, newval, 0,
|
|
|
1677 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1678
|
|
|
1679 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1680 {
|
|
|
1681 case SYMVAL_LISP_MAGIC:
|
|
|
1682 {
|
|
|
1683 if (UNBOUNDP (newval))
|
|
440
|
1684 {
|
|
|
1685 maybe_call_magic_handler (symbol, Qmakunbound, 0);
|
|
|
1686 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = Qunbound;
|
|
|
1687 }
|
|
428
|
1688 else
|
|
440
|
1689 {
|
|
|
1690 maybe_call_magic_handler (symbol, Qset, 1, newval);
|
|
|
1691 return XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed = newval;
|
|
|
1692 }
|
|
428
|
1693 }
|
|
|
1694
|
|
|
1695 case SYMVAL_VARALIAS:
|
|
|
1696 symbol = follow_varalias_pointers (symbol,
|
|
|
1697 UNBOUNDP (newval)
|
|
|
1698 ? Qmakunbound : Qset);
|
|
|
1699 /* presto change-o! */
|
|
|
1700 goto retry;
|
|
|
1701
|
|
|
1702 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1703 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1704 case SYMVAL_OBJECT_FORWARD:
|
|
|
1705 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1706 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1707 if (UNBOUNDP (newval))
|
|
|
1708 signal_error (Qerror,
|
|
|
1709 list2 (build_string ("Cannot makunbound"), symbol));
|
|
|
1710 break;
|
|
|
1711
|
|
|
1712 /* case SYMVAL_UNBOUND_MARKER: break; */
|
|
|
1713
|
|
|
1714 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1715 {
|
|
442
|
1716 const struct symbol_value_forward *fwd
|
|
428
|
1717 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1718 int mask = XINT (*((Lisp_Object *)
|
|
|
1719 symbol_value_forward_forward (fwd)));
|
|
|
1720 if (mask > 0)
|
|
|
1721 /* Setting this variable makes it buffer-local */
|
|
|
1722 current_buffer->local_var_flags |= mask;
|
|
|
1723 break;
|
|
|
1724 }
|
|
|
1725
|
|
|
1726 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1727 {
|
|
442
|
1728 const struct symbol_value_forward *fwd
|
|
428
|
1729 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1730 int mask = XINT (*((Lisp_Object *)
|
|
|
1731 symbol_value_forward_forward (fwd)));
|
|
|
1732 if (mask > 0)
|
|
|
1733 /* Setting this variable makes it console-local */
|
|
|
1734 XCONSOLE (Vselected_console)->local_var_flags |= mask;
|
|
|
1735 break;
|
|
|
1736 }
|
|
|
1737
|
|
|
1738 case SYMVAL_BUFFER_LOCAL:
|
|
|
1739 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1740 {
|
|
|
1741 /* If we want to examine or set the value and
|
|
|
1742 CURRENT-BUFFER is current, we just examine or set
|
|
|
1743 CURRENT-VALUE. If CURRENT-BUFFER is not current, we
|
|
|
1744 store the current CURRENT-VALUE value into
|
|
|
1745 CURRENT-ALIST- ELEMENT, then find the appropriate alist
|
|
|
1746 element for the buffer now current and set up
|
|
|
1747 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out
|
|
|
1748 of that element, and store into CURRENT-BUFFER.
|
|
|
1749
|
|
|
1750 If we are setting the variable and the current buffer does
|
|
|
1751 not have an alist entry for this variable, an alist entry is
|
|
|
1752 created.
|
|
|
1753
|
|
|
1754 Note that CURRENT-VALUE can be a forwarding pointer.
|
|
|
1755 Each time it is examined or set, forwarding must be
|
|
|
1756 done. */
|
|
|
1757 struct symbol_value_buffer_local *bfwd
|
|
|
1758 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1759 int some_buffer_local_p =
|
|
|
1760 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
1761 /* What value are we caching right now? */
|
|
|
1762 Lisp_Object aelt = bfwd->current_alist_element;
|
|
|
1763
|
|
|
1764 if (!NILP (bfwd->current_buffer) &&
|
|
|
1765 current_buffer == XBUFFER (bfwd->current_buffer)
|
|
|
1766 && ((some_buffer_local_p)
|
|
|
1767 ? 1 /* doesn't automatically become local */
|
|
|
1768 : !NILP (aelt) /* already local */
|
|
|
1769 ))
|
|
|
1770 {
|
|
|
1771 /* Cache is valid */
|
|
|
1772 valcontents = bfwd->current_value;
|
|
|
1773 }
|
|
|
1774 else
|
|
|
1775 {
|
|
|
1776 /* If the current buffer is not the buffer whose binding is
|
|
|
1777 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and
|
|
|
1778 we're looking at the default value, the cache is invalid; we
|
|
|
1779 need to write it out, and find the new CURRENT-ALIST-ELEMENT
|
|
|
1780 */
|
|
|
1781
|
|
|
1782 /* Write out the cached value for the old buffer; copy it
|
|
|
1783 back to its alist element. This works if the current
|
|
|
1784 buffer only sees the default value, too. */
|
|
|
1785 write_out_buffer_local_cache (symbol, bfwd);
|
|
|
1786
|
|
|
1787 /* Find the new value for CURRENT-ALIST-ELEMENT. */
|
|
|
1788 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd);
|
|
|
1789 if (NILP (aelt))
|
|
|
1790 {
|
|
|
1791 /* This buffer is still seeing the default value. */
|
|
|
1792 if (!some_buffer_local_p)
|
|
|
1793 {
|
|
|
1794 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a
|
|
|
1795 new assoc for a local value and set
|
|
|
1796 CURRENT-ALIST-ELEMENT to point to that. */
|
|
|
1797 aelt =
|
|
|
1798 do_symval_forwarding (bfwd->current_value,
|
|
|
1799 current_buffer,
|
|
|
1800 XCONSOLE (Vselected_console));
|
|
|
1801 aelt = Fcons (symbol, aelt);
|
|
|
1802 current_buffer->local_var_alist
|
|
|
1803 = Fcons (aelt, current_buffer->local_var_alist);
|
|
|
1804 }
|
|
|
1805 else
|
|
|
1806 {
|
|
|
1807 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL,
|
|
|
1808 we're currently seeing the default value. */
|
|
|
1809 ;
|
|
|
1810 }
|
|
|
1811 }
|
|
|
1812 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */
|
|
|
1813 bfwd->current_alist_element = aelt;
|
|
|
1814 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */
|
|
|
1815 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
1816 valcontents = bfwd->current_value;
|
|
|
1817 }
|
|
|
1818 break;
|
|
|
1819 }
|
|
|
1820 default:
|
|
|
1821 abort ();
|
|
|
1822 }
|
|
|
1823 store_symval_forwarding (symbol, valcontents, newval);
|
|
|
1824
|
|
|
1825 return newval;
|
|
|
1826 }
|
|
|
1827
|
|
|
1828
|
|
|
1829 /* Access or set a buffer-local symbol's default value. */
|
|
|
1830
|
|
|
1831 /* Return the default value of SYM, but don't check for voidness.
|
|
|
1832 Return Qunbound if it is void. */
|
|
|
1833
|
|
|
1834 static Lisp_Object
|
|
|
1835 default_value (Lisp_Object sym)
|
|
|
1836 {
|
|
|
1837 Lisp_Object valcontents;
|
|
|
1838
|
|
|
1839 CHECK_SYMBOL (sym);
|
|
|
1840
|
|
|
1841 retry:
|
|
|
1842 valcontents = XSYMBOL (sym)->value;
|
|
|
1843
|
|
|
1844 retry_2:
|
|
|
1845 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1846 return valcontents;
|
|
|
1847
|
|
|
1848 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1849 {
|
|
|
1850 case SYMVAL_LISP_MAGIC:
|
|
|
1851 /* #### kludge */
|
|
|
1852 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1853 /* semi-change-o */
|
|
|
1854 goto retry_2;
|
|
|
1855
|
|
|
1856 case SYMVAL_VARALIAS:
|
|
|
1857 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1858 /* presto change-o! */
|
|
|
1859 goto retry;
|
|
|
1860
|
|
|
1861 case SYMVAL_UNBOUND_MARKER:
|
|
|
1862 return valcontents;
|
|
|
1863
|
|
|
1864 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1865 {
|
|
442
|
1866 const struct symbol_value_forward *fwd
|
|
428
|
1867 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1868 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1869 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1870 - (char *)&buffer_local_flags))));
|
|
|
1871 }
|
|
|
1872
|
|
|
1873 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1874 {
|
|
442
|
1875 const struct symbol_value_forward *fwd
|
|
428
|
1876 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1877 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1878 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1879 - (char *)&console_local_flags))));
|
|
|
1880 }
|
|
|
1881
|
|
|
1882 case SYMVAL_BUFFER_LOCAL:
|
|
|
1883 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1884 {
|
|
|
1885 struct symbol_value_buffer_local *bfwd =
|
|
|
1886 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1887
|
|
|
1888 /* Handle user-created local variables. */
|
|
|
1889 /* If var is set up for a buffer that lacks a local value for it,
|
|
|
1890 the current value is nominally the default value.
|
|
|
1891 But the current value slot may be more up to date, since
|
|
|
1892 ordinary setq stores just that slot. So use that. */
|
|
|
1893 if (NILP (bfwd->current_alist_element))
|
|
|
1894 return do_symval_forwarding (bfwd->current_value, current_buffer,
|
|
|
1895 XCONSOLE (Vselected_console));
|
|
|
1896 else
|
|
|
1897 return bfwd->default_value;
|
|
|
1898 }
|
|
|
1899 default:
|
|
|
1900 /* For other variables, get the current value. */
|
|
|
1901 return do_symval_forwarding (valcontents, current_buffer,
|
|
|
1902 XCONSOLE (Vselected_console));
|
|
|
1903 }
|
|
|
1904
|
|
|
1905 RETURN_NOT_REACHED (Qnil) /* suppress compiler warning */
|
|
|
1906 }
|
|
|
1907
|
|
|
1908 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /*
|
|
|
1909 Return t if SYMBOL has a non-void default value.
|
|
|
1910 This is the value that is seen in buffers that do not have their own values
|
|
|
1911 for this variable.
|
|
|
1912 */
|
|
|
1913 (symbol))
|
|
|
1914 {
|
|
|
1915 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt;
|
|
|
1916 }
|
|
|
1917
|
|
|
1918 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /*
|
|
|
1919 Return SYMBOL's default value.
|
|
|
1920 This is the value that is seen in buffers that do not have their own values
|
|
|
1921 for this variable. The default value is meaningful for variables with
|
|
|
1922 local bindings in certain buffers.
|
|
|
1923 */
|
|
|
1924 (symbol))
|
|
|
1925 {
|
|
|
1926 Lisp_Object value = default_value (symbol);
|
|
|
1927
|
|
|
1928 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value;
|
|
|
1929 }
|
|
|
1930
|
|
|
1931 DEFUN ("set-default", Fset_default, 2, 2, 0, /*
|
|
444
|
1932 Set SYMBOL's default value to VALUE. SYMBOL and VALUE are evaluated.
|
|
428
|
1933 The default value is seen in buffers that do not have their own values
|
|
|
1934 for this variable.
|
|
|
1935 */
|
|
|
1936 (symbol, value))
|
|
|
1937 {
|
|
|
1938 Lisp_Object valcontents;
|
|
|
1939
|
|
|
1940 CHECK_SYMBOL (symbol);
|
|
|
1941
|
|
|
1942 retry:
|
|
|
1943 valcontents = XSYMBOL (symbol)->value;
|
|
|
1944
|
|
|
1945 retry_2:
|
|
|
1946 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1947 return Fset (symbol, value);
|
|
|
1948
|
|
|
1949 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1950 {
|
|
|
1951 case SYMVAL_LISP_MAGIC:
|
|
|
1952 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1,
|
|
|
1953 value));
|
|
|
1954 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1955 /* semi-change-o */
|
|
|
1956 goto retry_2;
|
|
|
1957
|
|
|
1958 case SYMVAL_VARALIAS:
|
|
|
1959 symbol = follow_varalias_pointers (symbol, Qset_default);
|
|
|
1960 /* presto change-o! */
|
|
|
1961 goto retry;
|
|
|
1962
|
|
|
1963 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1964 set_default_buffer_slot_variable (symbol, value);
|
|
|
1965 return value;
|
|
|
1966
|
|
|
1967 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1968 set_default_console_slot_variable (symbol, value);
|
|
|
1969 return value;
|
|
|
1970
|
|
|
1971 case SYMVAL_BUFFER_LOCAL:
|
|
|
1972 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1973 {
|
|
|
1974 /* Store new value into the DEFAULT-VALUE slot */
|
|
|
1975 struct symbol_value_buffer_local *bfwd
|
|
|
1976 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1977
|
|
|
1978 bfwd->default_value = value;
|
|
|
1979 /* If current-buffer doesn't shadow default_value,
|
|
|
1980 * we must set the CURRENT-VALUE slot too */
|
|
|
1981 if (NILP (bfwd->current_alist_element))
|
|
|
1982 store_symval_forwarding (symbol, bfwd->current_value, value);
|
|
|
1983 return value;
|
|
|
1984 }
|
|
|
1985
|
|
|
1986 default:
|
|
|
1987 return Fset (symbol, value);
|
|
|
1988 }
|
|
|
1989 }
|
|
|
1990
|
|
|
1991 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /*
|
|
|
1992 Set the default value of variable SYMBOL to VALUE.
|
|
|
1993 SYMBOL, the variable name, is literal (not evaluated);
|
|
|
1994 VALUE is an expression and it is evaluated.
|
|
|
1995 The default value of a variable is seen in buffers
|
|
|
1996 that do not have their own values for the variable.
|
|
|
1997
|
|
|
1998 More generally, you can use multiple variables and values, as in
|
|
|
1999 (setq-default SYMBOL VALUE SYMBOL VALUE...)
|
|
|
2000 This sets each SYMBOL's default value to the corresponding VALUE.
|
|
|
2001 The VALUE for the Nth SYMBOL can refer to the new default values
|
|
|
2002 of previous SYMBOLs.
|
|
|
2003 */
|
|
|
2004 (args))
|
|
|
2005 {
|
|
|
2006 /* This function can GC */
|
|
|
2007 Lisp_Object symbol, tail, val = Qnil;
|
|
|
2008 int nargs;
|
|
|
2009 struct gcpro gcpro1;
|
|
|
2010
|
|
|
2011 GET_LIST_LENGTH (args, nargs);
|
|
|
2012
|
|
|
2013 if (nargs & 1) /* Odd number of arguments? */
|
|
|
2014 Fsignal (Qwrong_number_of_arguments,
|
|
|
2015 list2 (Qsetq_default, make_int (nargs)));
|
|
|
2016
|
|
|
2017 GCPRO1 (val);
|
|
|
2018
|
|
|
2019 PROPERTY_LIST_LOOP (tail, symbol, val, args)
|
|
|
2020 {
|
|
|
2021 val = Feval (val);
|
|
|
2022 Fset_default (symbol, val);
|
|
|
2023 }
|
|
|
2024
|
|
|
2025 UNGCPRO;
|
|
|
2026 return val;
|
|
|
2027 }
|
|
|
2028
|
|
|
2029 /* Lisp functions for creating and removing buffer-local variables. */
|
|
|
2030
|
|
|
2031 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1,
|
|
|
2032 "vMake Variable Buffer Local: ", /*
|
|
|
2033 Make VARIABLE have a separate value for each buffer.
|
|
|
2034 At any time, the value for the current buffer is in effect.
|
|
|
2035 There is also a default value which is seen in any buffer which has not yet
|
|
|
2036 set its own value.
|
|
|
2037 Using `set' or `setq' to set the variable causes it to have a separate value
|
|
|
2038 for the current buffer if it was previously using the default value.
|
|
|
2039 The function `default-value' gets the default value and `set-default'
|
|
|
2040 sets it.
|
|
|
2041 */
|
|
|
2042 (variable))
|
|
|
2043 {
|
|
|
2044 Lisp_Object valcontents;
|
|
|
2045
|
|
|
2046 CHECK_SYMBOL (variable);
|
|
|
2047
|
|
|
2048 retry:
|
|
|
2049 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local);
|
|
|
2050
|
|
|
2051 valcontents = XSYMBOL (variable)->value;
|
|
|
2052
|
|
|
2053 retry_2:
|
|
|
2054 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2055 {
|
|
|
2056 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2057 {
|
|
|
2058 case SYMVAL_LISP_MAGIC:
|
|
|
2059 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2060 (variable, Qmake_variable_buffer_local, 0)))
|
|
|
2061 return variable;
|
|
|
2062 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2063 /* semi-change-o */
|
|
|
2064 goto retry_2;
|
|
|
2065
|
|
|
2066 case SYMVAL_VARALIAS:
|
|
|
2067 variable = follow_varalias_pointers (variable,
|
|
|
2068 Qmake_variable_buffer_local);
|
|
|
2069 /* presto change-o! */
|
|
|
2070 goto retry;
|
|
|
2071
|
|
|
2072 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2073 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2074 case SYMVAL_OBJECT_FORWARD:
|
|
|
2075 case SYMVAL_UNBOUND_MARKER:
|
|
|
2076 break;
|
|
|
2077
|
|
|
2078 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2079 case SYMVAL_BUFFER_LOCAL:
|
|
|
2080 /* Already per-each-buffer */
|
|
|
2081 return variable;
|
|
|
2082
|
|
|
2083 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2084 /* Transmogrify */
|
|
|
2085 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type =
|
|
|
2086 SYMVAL_BUFFER_LOCAL;
|
|
|
2087 return variable;
|
|
|
2088
|
|
|
2089 default:
|
|
|
2090 abort ();
|
|
|
2091 }
|
|
|
2092 }
|
|
|
2093
|
|
|
2094 {
|
|
|
2095 struct symbol_value_buffer_local *bfwd
|
|
|
2096 = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
|
2097 &lrecord_symbol_value_buffer_local);
|
|
|
2098 Lisp_Object foo;
|
|
|
2099 bfwd->magic.type = SYMVAL_BUFFER_LOCAL;
|
|
|
2100
|
|
|
2101 bfwd->default_value = find_symbol_value (variable);
|
|
|
2102 bfwd->current_value = valcontents;
|
|
|
2103 bfwd->current_alist_element = Qnil;
|
|
|
2104 bfwd->current_buffer = Fcurrent_buffer ();
|
|
|
2105 XSETSYMBOL_VALUE_MAGIC (foo, bfwd);
|
|
|
2106 *value_slot_past_magic (variable) = foo;
|
|
|
2107 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/
|
|
|
2108 /* This sets the default-value of any make-variable-buffer-local to nil.
|
|
|
2109 That just sucks. User can just use setq-default to effect that,
|
|
|
2110 but there's no way to do makunbound-default to undo this lossage. */
|
|
|
2111 if (UNBOUNDP (valcontents))
|
|
|
2112 bfwd->default_value = Qnil;
|
|
|
2113 #endif
|
|
|
2114 #if 0 /* #### Yuck! */
|
|
|
2115 /* This sets the value to nil in this buffer.
|
|
|
2116 User could use (setq variable nil) to do this.
|
|
|
2117 It isn't as egregious to do this automatically
|
|
|
2118 as it is to do so to the default-value, but it's
|
|
|
2119 still really dubious. */
|
|
|
2120 if (UNBOUNDP (valcontents))
|
|
|
2121 Fset (variable, Qnil);
|
|
|
2122 #endif
|
|
|
2123 return variable;
|
|
|
2124 }
|
|
|
2125 }
|
|
|
2126
|
|
|
2127 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1,
|
|
|
2128 "vMake Local Variable: ", /*
|
|
|
2129 Make VARIABLE have a separate value in the current buffer.
|
|
|
2130 Other buffers will continue to share a common default value.
|
|
|
2131 \(The buffer-local value of VARIABLE starts out as the same value
|
|
|
2132 VARIABLE previously had. If VARIABLE was void, it remains void.)
|
|
|
2133 See also `make-variable-buffer-local'.
|
|
|
2134
|
|
|
2135 If the variable is already arranged to become local when set,
|
|
|
2136 this function causes a local value to exist for this buffer,
|
|
|
2137 just as setting the variable would do.
|
|
|
2138
|
|
|
2139 Do not use `make-local-variable' to make a hook variable buffer-local.
|
|
|
2140 Use `make-local-hook' instead.
|
|
|
2141 */
|
|
|
2142 (variable))
|
|
|
2143 {
|
|
|
2144 Lisp_Object valcontents;
|
|
|
2145 struct symbol_value_buffer_local *bfwd;
|
|
|
2146
|
|
|
2147 CHECK_SYMBOL (variable);
|
|
|
2148
|
|
|
2149 retry:
|
|
|
2150 verify_ok_for_buffer_local (variable, Qmake_local_variable);
|
|
|
2151
|
|
|
2152 valcontents = XSYMBOL (variable)->value;
|
|
|
2153
|
|
|
2154 retry_2:
|
|
|
2155 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2156 {
|
|
|
2157 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2158 {
|
|
|
2159 case SYMVAL_LISP_MAGIC:
|
|
|
2160 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2161 (variable, Qmake_local_variable, 0)))
|
|
|
2162 return variable;
|
|
|
2163 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2164 /* semi-change-o */
|
|
|
2165 goto retry_2;
|
|
|
2166
|
|
|
2167 case SYMVAL_VARALIAS:
|
|
|
2168 variable = follow_varalias_pointers (variable, Qmake_local_variable);
|
|
|
2169 /* presto change-o! */
|
|
|
2170 goto retry;
|
|
|
2171
|
|
|
2172 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2173 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2174 case SYMVAL_OBJECT_FORWARD:
|
|
|
2175 case SYMVAL_UNBOUND_MARKER:
|
|
|
2176 break;
|
|
|
2177
|
|
|
2178 case SYMVAL_BUFFER_LOCAL:
|
|
|
2179 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2180 {
|
|
|
2181 /* Make sure the symbol has a local value in this particular
|
|
|
2182 buffer, by setting it to the same value it already has. */
|
|
|
2183 Fset (variable, find_symbol_value (variable));
|
|
|
2184 return variable;
|
|
|
2185 }
|
|
|
2186
|
|
|
2187 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2188 {
|
|
|
2189 if (!NILP (buffer_local_alist_element (current_buffer,
|
|
|
2190 variable,
|
|
|
2191 (XSYMBOL_VALUE_BUFFER_LOCAL
|
|
|
2192 (valcontents)))))
|
|
|
2193 goto already_local_to_current_buffer;
|
|
|
2194 else
|
|
|
2195 goto already_local_to_some_other_buffer;
|
|
|
2196 }
|
|
|
2197
|
|
|
2198 default:
|
|
|
2199 abort ();
|
|
|
2200 }
|
|
|
2201 }
|
|
|
2202
|
|
|
2203 /* Make sure variable is set up to hold per-buffer values */
|
|
|
2204 bfwd = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
|
2205 &lrecord_symbol_value_buffer_local);
|
|
|
2206 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL;
|
|
|
2207
|
|
|
2208 bfwd->current_buffer = Qnil;
|
|
|
2209 bfwd->current_alist_element = Qnil;
|
|
|
2210 bfwd->current_value = valcontents;
|
|
|
2211 /* passing 0 is OK because this should never be a
|
|
|
2212 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD
|
|
|
2213 variable. */
|
|
|
2214 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0);
|
|
|
2215
|
|
|
2216 #if 0
|
|
|
2217 if (UNBOUNDP (bfwd->default_value))
|
|
|
2218 bfwd->default_value = Qnil; /* Yuck! */
|
|
|
2219 #endif
|
|
|
2220
|
|
|
2221 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
2222 *value_slot_past_magic (variable) = valcontents;
|
|
|
2223
|
|
|
2224 already_local_to_some_other_buffer:
|
|
|
2225
|
|
|
2226 /* Make sure this buffer has its own value of variable */
|
|
|
2227 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2228
|
|
|
2229 if (UNBOUNDP (bfwd->default_value))
|
|
|
2230 {
|
|
|
2231 /* If default value is unbound, set local value to nil. */
|
|
|
2232 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
2233 bfwd->current_alist_element = Fcons (variable, Qnil);
|
|
|
2234 current_buffer->local_var_alist =
|
|
|
2235 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist);
|
|
|
2236 store_symval_forwarding (variable, bfwd->current_value, Qnil);
|
|
|
2237 return variable;
|
|
|
2238 }
|
|
|
2239
|
|
|
2240 current_buffer->local_var_alist
|
|
|
2241 = Fcons (Fcons (variable, bfwd->default_value),
|
|
|
2242 current_buffer->local_var_alist);
|
|
|
2243
|
|
|
2244 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2245 force it to look once again for this buffer's value */
|
|
|
2246 if (!NILP (bfwd->current_buffer) &&
|
|
|
2247 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2248 bfwd->current_buffer = Qnil;
|
|
|
2249
|
|
|
2250 already_local_to_current_buffer:
|
|
|
2251
|
|
|
2252 /* If the symbol forwards into a C variable, then swap in the
|
|
|
2253 variable for this buffer immediately. If C code modifies the
|
|
|
2254 variable before we swap in, then that new value will clobber the
|
|
|
2255 default value the next time we swap. */
|
|
|
2256 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2257 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value))
|
|
|
2258 {
|
|
|
2259 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value))
|
|
|
2260 {
|
|
|
2261 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2262 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2263 case SYMVAL_OBJECT_FORWARD:
|
|
|
2264 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
2265 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
|
2266 break;
|
|
|
2267
|
|
|
2268 case SYMVAL_UNBOUND_MARKER:
|
|
|
2269 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2270 break;
|
|
|
2271
|
|
|
2272 default:
|
|
|
2273 abort ();
|
|
|
2274 }
|
|
|
2275 }
|
|
|
2276
|
|
|
2277 return variable;
|
|
|
2278 }
|
|
|
2279
|
|
|
2280 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1,
|
|
|
2281 "vKill Local Variable: ", /*
|
|
|
2282 Make VARIABLE no longer have a separate value in the current buffer.
|
|
|
2283 From now on the default value will apply in this buffer.
|
|
|
2284 */
|
|
|
2285 (variable))
|
|
|
2286 {
|
|
|
2287 Lisp_Object valcontents;
|
|
|
2288
|
|
|
2289 CHECK_SYMBOL (variable);
|
|
|
2290
|
|
|
2291 retry:
|
|
|
2292 valcontents = XSYMBOL (variable)->value;
|
|
|
2293
|
|
|
2294 retry_2:
|
|
|
2295 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2296 return variable;
|
|
|
2297
|
|
|
2298 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2299 {
|
|
|
2300 case SYMVAL_LISP_MAGIC:
|
|
|
2301 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2302 (variable, Qkill_local_variable, 0)))
|
|
|
2303 return variable;
|
|
|
2304 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2305 /* semi-change-o */
|
|
|
2306 goto retry_2;
|
|
|
2307
|
|
|
2308 case SYMVAL_VARALIAS:
|
|
|
2309 variable = follow_varalias_pointers (variable, Qkill_local_variable);
|
|
|
2310 /* presto change-o! */
|
|
|
2311 goto retry;
|
|
|
2312
|
|
|
2313 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2314 {
|
|
442
|
2315 const struct symbol_value_forward *fwd
|
|
428
|
2316 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2317 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
2318 - (char *) &buffer_local_flags);
|
|
|
2319 int mask =
|
|
|
2320 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2321
|
|
|
2322 if (mask > 0)
|
|
|
2323 {
|
|
|
2324 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2325 Lisp_Object in_object, int flags) =
|
|
|
2326 symbol_value_forward_magicfun (fwd);
|
|
|
2327 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2328 (offset + (char *) XBUFFER (Vbuffer_defaults));
|
|
|
2329 if (magicfun)
|
|
|
2330 (magicfun) (variable, &oldval, make_buffer (current_buffer), 0);
|
|
|
2331 *(Lisp_Object *) (offset + (char *) current_buffer)
|
|
|
2332 = oldval;
|
|
|
2333 current_buffer->local_var_flags &= ~mask;
|
|
|
2334 }
|
|
|
2335 return variable;
|
|
|
2336 }
|
|
|
2337
|
|
|
2338 case SYMVAL_BUFFER_LOCAL:
|
|
|
2339 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2340 {
|
|
|
2341 /* Get rid of this buffer's alist element, if any */
|
|
|
2342 struct symbol_value_buffer_local *bfwd
|
|
|
2343 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2344 Lisp_Object alist = current_buffer->local_var_alist;
|
|
|
2345 Lisp_Object alist_element
|
|
|
2346 = buffer_local_alist_element (current_buffer, variable, bfwd);
|
|
|
2347
|
|
|
2348 if (!NILP (alist_element))
|
|
|
2349 current_buffer->local_var_alist = Fdelq (alist_element, alist);
|
|
|
2350
|
|
|
2351 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2352 force it to look once again for this buffer's value */
|
|
|
2353 if (!NILP (bfwd->current_buffer) &&
|
|
|
2354 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2355 bfwd->current_buffer = Qnil;
|
|
|
2356
|
|
|
2357 /* We just changed the value in the current_buffer. If this
|
|
|
2358 variable forwards to a C variable, we need to change the
|
|
|
2359 value of the C variable. set_up_buffer_local_cache()
|
|
|
2360 will do this. It doesn't hurt to do it always,
|
|
|
2361 so just go ahead and do that. */
|
|
|
2362 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
|
2363 }
|
|
|
2364 return variable;
|
|
|
2365
|
|
|
2366 default:
|
|
|
2367 return variable;
|
|
|
2368 }
|
|
|
2369 RETURN_NOT_REACHED(Qnil) /* suppress compiler warning */
|
|
|
2370 }
|
|
|
2371
|
|
|
2372
|
|
|
2373 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1,
|
|
|
2374 "vKill Console Local Variable: ", /*
|
|
|
2375 Make VARIABLE no longer have a separate value in the selected console.
|
|
|
2376 From now on the default value will apply in this console.
|
|
|
2377 */
|
|
|
2378 (variable))
|
|
|
2379 {
|
|
|
2380 Lisp_Object valcontents;
|
|
|
2381
|
|
|
2382 CHECK_SYMBOL (variable);
|
|
|
2383
|
|
|
2384 retry:
|
|
|
2385 valcontents = XSYMBOL (variable)->value;
|
|
|
2386
|
|
|
2387 retry_2:
|
|
|
2388 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2389 return variable;
|
|
|
2390
|
|
|
2391 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2392 {
|
|
|
2393 case SYMVAL_LISP_MAGIC:
|
|
|
2394 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2395 (variable, Qkill_console_local_variable, 0)))
|
|
|
2396 return variable;
|
|
|
2397 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2398 /* semi-change-o */
|
|
|
2399 goto retry_2;
|
|
|
2400
|
|
|
2401 case SYMVAL_VARALIAS:
|
|
|
2402 variable = follow_varalias_pointers (variable,
|
|
|
2403 Qkill_console_local_variable);
|
|
|
2404 /* presto change-o! */
|
|
|
2405 goto retry;
|
|
|
2406
|
|
|
2407 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
2408 {
|
|
442
|
2409 const struct symbol_value_forward *fwd
|
|
428
|
2410 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2411 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
|
2412 - (char *) &console_local_flags);
|
|
|
2413 int mask =
|
|
|
2414 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2415
|
|
|
2416 if (mask > 0)
|
|
|
2417 {
|
|
|
2418 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2419 Lisp_Object in_object, int flags) =
|
|
|
2420 symbol_value_forward_magicfun (fwd);
|
|
|
2421 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2422 (offset + (char *) XCONSOLE (Vconsole_defaults));
|
|
|
2423 if (magicfun)
|
|
|
2424 magicfun (variable, &oldval, Vselected_console, 0);
|
|
|
2425 *(Lisp_Object *) (offset + (char *) XCONSOLE (Vselected_console))
|
|
|
2426 = oldval;
|
|
|
2427 XCONSOLE (Vselected_console)->local_var_flags &= ~mask;
|
|
|
2428 }
|
|
|
2429 return variable;
|
|
|
2430 }
|
|
|
2431
|
|
|
2432 default:
|
|
|
2433 return variable;
|
|
|
2434 }
|
|
|
2435 }
|
|
|
2436
|
|
|
2437 /* Used by specbind to determine what effects it might have. Returns:
|
|
|
2438 * 0 if symbol isn't buffer-local, and wouldn't be after it is set
|
|
|
2439 * <0 if symbol isn't presently buffer-local, but set would make it so
|
|
|
2440 * >0 if symbol is presently buffer-local
|
|
|
2441 */
|
|
|
2442 int
|
|
|
2443 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer)
|
|
|
2444 {
|
|
|
2445 Lisp_Object valcontents;
|
|
|
2446
|
|
|
2447 retry:
|
|
|
2448 valcontents = XSYMBOL (symbol)->value;
|
|
|
2449
|
|
|
2450 retry_2:
|
|
|
2451 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2452 {
|
|
|
2453 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2454 {
|
|
|
2455 case SYMVAL_LISP_MAGIC:
|
|
|
2456 /* #### kludge */
|
|
|
2457 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2458 /* semi-change-o */
|
|
|
2459 goto retry_2;
|
|
|
2460
|
|
|
2461 case SYMVAL_VARALIAS:
|
|
|
2462 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */);
|
|
|
2463 /* presto change-o! */
|
|
|
2464 goto retry;
|
|
|
2465
|
|
|
2466 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2467 {
|
|
442
|
2468 const struct symbol_value_forward *fwd
|
|
428
|
2469 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2470 int mask = XINT (*((Lisp_Object *)
|
|
|
2471 symbol_value_forward_forward (fwd)));
|
|
|
2472 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask)))
|
|
|
2473 /* Already buffer-local */
|
|
|
2474 return 1;
|
|
|
2475 else
|
|
|
2476 /* Would be buffer-local after set */
|
|
|
2477 return -1;
|
|
|
2478 }
|
|
|
2479 case SYMVAL_BUFFER_LOCAL:
|
|
|
2480 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2481 {
|
|
|
2482 struct symbol_value_buffer_local *bfwd
|
|
|
2483 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2484 if (buffer
|
|
|
2485 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd)))
|
|
|
2486 return 1;
|
|
|
2487 else
|
|
|
2488 /* Automatically becomes local when set */
|
|
|
2489 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0;
|
|
|
2490 }
|
|
|
2491 default:
|
|
|
2492 return 0;
|
|
|
2493 }
|
|
|
2494 }
|
|
|
2495 return 0;
|
|
|
2496 }
|
|
|
2497
|
|
|
2498
|
|
|
2499 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /*
|
|
|
2500 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound.
|
|
|
2501 */
|
|
|
2502 (symbol, buffer, unbound_value))
|
|
|
2503 {
|
|
|
2504 Lisp_Object value;
|
|
|
2505 CHECK_SYMBOL (symbol);
|
|
|
2506 CHECK_BUFFER (buffer);
|
|
|
2507 value = symbol_value_in_buffer (symbol, buffer);
|
|
|
2508 return UNBOUNDP (value) ? unbound_value : value;
|
|
|
2509 }
|
|
|
2510
|
|
|
2511 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /*
|
|
|
2512 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound.
|
|
|
2513 */
|
|
|
2514 (symbol, console, unbound_value))
|
|
|
2515 {
|
|
|
2516 Lisp_Object value;
|
|
|
2517 CHECK_SYMBOL (symbol);
|
|
|
2518 CHECK_CONSOLE (console);
|
|
|
2519 value = symbol_value_in_console (symbol, console);
|
|
|
2520 return UNBOUNDP (value) ? unbound_value : value;
|
|
|
2521 }
|
|
|
2522
|
|
|
2523 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /*
|
|
|
2524 If SYMBOL is a built-in variable, return info about this; else return nil.
|
|
|
2525 The returned info will be a symbol, one of
|
|
|
2526
|
|
|
2527 `object' A simple built-in variable.
|
|
|
2528 `const-object' Same, but cannot be set.
|
|
|
2529 `integer' A built-in integer variable.
|
|
|
2530 `const-integer' Same, but cannot be set.
|
|
|
2531 `boolean' A built-in boolean variable.
|
|
|
2532 `const-boolean' Same, but cannot be set.
|
|
|
2533 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'.
|
|
|
2534 `current-buffer' A built-in buffer-local variable.
|
|
|
2535 `const-current-buffer' Same, but cannot be set.
|
|
|
2536 `default-buffer' Forwards to the default value of a built-in
|
|
|
2537 buffer-local variable.
|
|
|
2538 `selected-console' A built-in console-local variable.
|
|
|
2539 `const-selected-console' Same, but cannot be set.
|
|
|
2540 `default-console' Forwards to the default value of a built-in
|
|
|
2541 console-local variable.
|
|
|
2542 */
|
|
|
2543 (symbol))
|
|
|
2544 {
|
|
|
2545 REGISTER Lisp_Object valcontents;
|
|
|
2546
|
|
|
2547 CHECK_SYMBOL (symbol);
|
|
|
2548
|
|
|
2549 retry:
|
|
|
2550 valcontents = XSYMBOL (symbol)->value;
|
|
|
2551
|
|
|
2552 retry_2:
|
|
|
2553 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2554 return Qnil;
|
|
|
2555
|
|
|
2556 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2557 {
|
|
|
2558 case SYMVAL_LISP_MAGIC:
|
|
|
2559 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2560 /* semi-change-o */
|
|
|
2561 goto retry_2;
|
|
|
2562
|
|
|
2563 case SYMVAL_VARALIAS:
|
|
|
2564 symbol = follow_varalias_pointers (symbol, Qt);
|
|
|
2565 /* presto change-o! */
|
|
|
2566 goto retry;
|
|
|
2567
|
|
|
2568 case SYMVAL_BUFFER_LOCAL:
|
|
|
2569 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2570 valcontents =
|
|
|
2571 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value;
|
|
|
2572 /* semi-change-o */
|
|
|
2573 goto retry_2;
|
|
|
2574
|
|
|
2575 case SYMVAL_FIXNUM_FORWARD: return Qinteger;
|
|
|
2576 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer;
|
|
|
2577 case SYMVAL_BOOLEAN_FORWARD: return Qboolean;
|
|
|
2578 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean;
|
|
|
2579 case SYMVAL_OBJECT_FORWARD: return Qobject;
|
|
|
2580 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object;
|
|
|
2581 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier;
|
|
|
2582 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer;
|
|
|
2583 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer;
|
|
|
2584 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer;
|
|
|
2585 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console;
|
|
|
2586 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console;
|
|
|
2587 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console;
|
|
|
2588 case SYMVAL_UNBOUND_MARKER: return Qnil;
|
|
|
2589
|
|
|
2590 default:
|
|
|
2591 abort (); return Qnil;
|
|
|
2592 }
|
|
|
2593 }
|
|
|
2594
|
|
|
2595
|
|
|
2596 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /*
|
|
|
2597 Return t if SYMBOL's value is local to BUFFER.
|
|
444
|
2598 If optional third arg AFTER-SET is non-nil, return t if SYMBOL would be
|
|
428
|
2599 buffer-local after it is set, regardless of whether it is so presently.
|
|
|
2600 A nil value for BUFFER is *not* the same as (current-buffer), but means
|
|
|
2601 "no buffer". Specifically:
|
|
|
2602
|
|
|
2603 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that
|
|
|
2604 the variable is one of the special built-in variables that is always
|
|
|
2605 buffer-local. (This includes `buffer-file-name', `buffer-read-only',
|
|
|
2606 `buffer-undo-list', and others.)
|
|
|
2607
|
|
|
2608 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that
|
|
|
2609 the variable has had `make-variable-buffer-local' applied to it.
|
|
|
2610 */
|
|
|
2611 (symbol, buffer, after_set))
|
|
|
2612 {
|
|
|
2613 int local_info;
|
|
|
2614
|
|
|
2615 CHECK_SYMBOL (symbol);
|
|
|
2616 if (!NILP (buffer))
|
|
|
2617 {
|
|
|
2618 buffer = get_buffer (buffer, 1);
|
|
|
2619 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer));
|
|
|
2620 }
|
|
|
2621 else
|
|
|
2622 {
|
|
|
2623 local_info = symbol_value_buffer_local_info (symbol, 0);
|
|
|
2624 }
|
|
|
2625
|
|
|
2626 if (NILP (after_set))
|
|
|
2627 return local_info > 0 ? Qt : Qnil;
|
|
|
2628 else
|
|
|
2629 return local_info != 0 ? Qt : Qnil;
|
|
|
2630 }
|
|
|
2631
|
|
|
2632
|
|
|
2633 /*
|
|
|
2634 I've gone ahead and partially implemented this because it's
|
|
|
2635 super-useful for dealing with the compatibility problems in supporting
|
|
|
2636 the old pointer-shape variables, and preventing people from `setq'ing
|
|
|
2637 the new variables. Any other way of handling this problem is way
|
|
|
2638 ugly, likely to be slow, and generally not something I want to waste
|
|
|
2639 my time worrying about.
|
|
|
2640
|
|
|
2641 The interface and/or function name is sure to change before this
|
|
|
2642 gets into its final form. I currently like the way everything is
|
|
|
2643 set up and it has all the features I want it to have, except for
|
|
|
2644 one: I really want to be able to have multiple nested handlers,
|
|
|
2645 to implement an `advice'-like capability. This would allow,
|
|
|
2646 for example, a clean way of implementing `debug-if-set' or
|
|
|
2647 `debug-if-referenced' and such.
|
|
|
2648
|
|
|
2649 NOTE NOTE NOTE NOTE NOTE NOTE NOTE:
|
|
|
2650 ************************************************************
|
|
|
2651 **Only** the `set-value', `make-unbound', and `make-local'
|
|
|
2652 handler types are currently implemented. Implementing the
|
|
|
2653 get-value and bound-predicate handlers is somewhat tricky
|
|
|
2654 because there are lots of subfunctions (e.g. find_symbol_value()).
|
|
|
2655 find_symbol_value(), in fact, is called from outside of
|
|
|
2656 this module. You'd have to have it do this:
|
|
|
2657
|
|
|
2658 -- check for a `bound-predicate' handler, call that if so;
|
|
|
2659 if it returns nil, return Qunbound
|
|
|
2660 -- check for a `get-value' handler and call it and return
|
|
|
2661 that value
|
|
|
2662
|
|
|
2663 It gets even trickier when you have to deal with
|
|
|
2664 sub-subfunctions like find_symbol_value_1(), and esp.
|
|
|
2665 when you have to properly handle variable aliases, which
|
|
|
2666 can lead to lots of tricky situations. So I've just
|
|
|
2667 punted on this, since the interface isn't officially
|
|
|
2668 exported and we can get by with just a `set-value'
|
|
|
2669 handler.
|
|
|
2670
|
|
|
2671 Actions in unimplemented handler types will correctly
|
|
|
2672 ignore any handlers, and will not fuck anything up or
|
|
|
2673 go awry.
|
|
|
2674
|
|
|
2675 WARNING WARNING: If you do go and implement another
|
|
|
2676 type of handler, make *sure* to change
|
|
|
2677 would_be_magic_handled() so it knows about this,
|
|
|
2678 or dire things could result.
|
|
|
2679 ************************************************************
|
|
|
2680 NOTE NOTE NOTE NOTE NOTE NOTE NOTE
|
|
|
2681
|
|
|
2682 Real documentation is as follows.
|
|
|
2683
|
|
|
2684 Set a magic handler for VARIABLE.
|
|
|
2685 This allows you to specify arbitrary behavior that results from
|
|
|
2686 accessing or setting a variable. For example, retrieving the
|
|
|
2687 variable's value might actually retrieve the first element off of
|
|
|
2688 a list stored in another variable, and setting the variable's value
|
|
|
2689 might add an element to the front of that list. (This is how the
|
|
|
2690 obsolete variable `unread-command-event' is implemented.)
|
|
|
2691
|
|
|
2692 In general it is NOT good programming practice to use magic variables
|
|
|
2693 in a new package that you are designing. If you feel the need to
|
|
|
2694 do this, it's almost certainly a sign that you should be using a
|
|
|
2695 function instead of a variable. This facility is provided to allow
|
|
|
2696 a package to support obsolete variables and provide compatibility
|
|
|
2697 with similar packages with different variable names and semantics.
|
|
|
2698 By using magic handlers, you can cleanly provide obsoleteness and
|
|
|
2699 compatibility support and separate this support from the core
|
|
|
2700 routines in a package.
|
|
|
2701
|
|
|
2702 VARIABLE should be a symbol naming the variable for which the
|
|
|
2703 magic behavior is provided. HANDLER-TYPE is a symbol specifying
|
|
|
2704 which behavior is being controlled, and HANDLER is the function
|
|
|
2705 that will be called to control this behavior. HARG is a
|
|
|
2706 value that will be passed to HANDLER but is otherwise
|
|
|
2707 uninterpreted. KEEP-EXISTING specifies what to do with existing
|
|
|
2708 handlers of the same type; nil means "erase them all", t means
|
|
|
2709 "keep them but insert at the beginning", the list (t) means
|
|
|
2710 "keep them but insert at the end", a function means "keep
|
|
|
2711 them but insert before the specified function", a list containing
|
|
|
2712 a function means "keep them but insert after the specified
|
|
|
2713 function".
|
|
|
2714
|
|
|
2715 You can specify magic behavior for any type of variable at all,
|
|
|
2716 and for any handler types that are unspecified, the standard
|
|
|
2717 behavior applies. This allows you, for example, to use
|
|
|
2718 `defvaralias' in conjunction with this function. (For that
|
|
|
2719 matter, `defvaralias' could be implemented using this function.)
|
|
|
2720
|
|
|
2721 The behaviors that can be specified in HANDLER-TYPE are
|
|
|
2722
|
|
|
2723 get-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2724 This means that one of the functions `symbol-value',
|
|
|
2725 `default-value', `symbol-value-in-buffer', or
|
|
|
2726 `symbol-value-in-console' was called on SYM.
|
|
|
2727
|
|
|
2728 set-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2729 This means that one of the functions `set' or `set-default'
|
|
|
2730 was called on SYM.
|
|
|
2731
|
|
|
2732 bound-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2733 This means that one of the functions `boundp', `globally-boundp',
|
|
|
2734 or `default-boundp' was called on SYM.
|
|
|
2735
|
|
|
2736 make-unbound (SYM ARGS FUN HARG HANDLERS)
|
|
|
2737 This means that the function `makunbound' was called on SYM.
|
|
|
2738
|
|
|
2739 local-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2740 This means that the function `local-variable-p' was called
|
|
|
2741 on SYM.
|
|
|
2742
|
|
|
2743 make-local (SYM ARGS FUN HARG HANDLERS)
|
|
|
2744 This means that one of the functions `make-local-variable',
|
|
|
2745 `make-variable-buffer-local', `kill-local-variable',
|
|
|
2746 or `kill-console-local-variable' was called on SYM.
|
|
|
2747
|
|
|
2748 The meanings of the arguments are as follows:
|
|
|
2749
|
|
|
2750 SYM is the symbol on which the function was called, and is always
|
|
|
2751 the first argument to the function.
|
|
|
2752
|
|
|
2753 ARGS are the remaining arguments in the original call (i.e. all
|
|
|
2754 but the first). In the case of `set-value' in particular,
|
|
|
2755 the first element of ARGS is the value to which the variable
|
|
|
2756 is being set. In some cases, ARGS is sanitized from what was
|
|
|
2757 actually given. For example, whenever `nil' is passed to an
|
|
|
2758 argument and it means `current-buffer', the current buffer is
|
|
|
2759 substituted instead.
|
|
|
2760
|
|
|
2761 FUN is a symbol indicating which function is being called.
|
|
|
2762 For many of the functions, you can determine the corresponding
|
|
|
2763 function of a different class using
|
|
|
2764 `symbol-function-corresponding-function'.
|
|
|
2765
|
|
|
2766 HARG is the argument that was given in the call
|
|
|
2767 to `set-symbol-value-handler' for SYM and HANDLER-TYPE.
|
|
|
2768
|
|
|
2769 HANDLERS is a structure containing the remaining handlers
|
|
|
2770 for the variable; to call one of them, use
|
|
|
2771 `chain-to-symbol-value-handler'.
|
|
|
2772
|
|
|
2773 NOTE: You may *not* modify the list in ARGS, and if you want to
|
|
|
2774 keep it around after the handler function exits, you must make
|
|
|
2775 a copy using `copy-sequence'. (Same caveats for HANDLERS also.)
|
|
|
2776 */
|
|
|
2777
|
|
|
2778 static enum lisp_magic_handler
|
|
|
2779 decode_magic_handler_type (Lisp_Object symbol)
|
|
|
2780 {
|
|
|
2781 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE;
|
|
|
2782 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE;
|
|
|
2783 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2784 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2785 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2786 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2787
|
|
|
2788 signal_simple_error ("Unrecognized symbol value handler type", symbol);
|
|
|
2789 abort ();
|
|
|
2790 return MAGIC_HANDLER_MAX;
|
|
|
2791 }
|
|
|
2792
|
|
|
2793 static enum lisp_magic_handler
|
|
|
2794 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found)
|
|
|
2795 {
|
|
|
2796 if (EQ (funsym, Qsymbol_value)
|
|
|
2797 || EQ (funsym, Qdefault_value)
|
|
|
2798 || EQ (funsym, Qsymbol_value_in_buffer)
|
|
|
2799 || EQ (funsym, Qsymbol_value_in_console))
|
|
|
2800 return MAGIC_HANDLER_GET_VALUE;
|
|
|
2801
|
|
|
2802 if (EQ (funsym, Qset)
|
|
|
2803 || EQ (funsym, Qset_default))
|
|
|
2804 return MAGIC_HANDLER_SET_VALUE;
|
|
|
2805
|
|
|
2806 if (EQ (funsym, Qboundp)
|
|
|
2807 || EQ (funsym, Qglobally_boundp)
|
|
|
2808 || EQ (funsym, Qdefault_boundp))
|
|
|
2809 return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2810
|
|
|
2811 if (EQ (funsym, Qmakunbound))
|
|
|
2812 return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2813
|
|
|
2814 if (EQ (funsym, Qlocal_variable_p))
|
|
|
2815 return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2816
|
|
|
2817 if (EQ (funsym, Qmake_variable_buffer_local)
|
|
|
2818 || EQ (funsym, Qmake_local_variable))
|
|
|
2819 return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2820
|
|
|
2821 if (abort_if_not_found)
|
|
|
2822 abort ();
|
|
|
2823 signal_simple_error ("Unrecognized symbol-value function", funsym);
|
|
|
2824 return MAGIC_HANDLER_MAX;
|
|
|
2825 }
|
|
|
2826
|
|
|
2827 static int
|
|
|
2828 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym)
|
|
|
2829 {
|
|
|
2830 /* does not take into account variable aliasing. */
|
|
|
2831 Lisp_Object valcontents = XSYMBOL (sym)->value;
|
|
|
2832 enum lisp_magic_handler slot;
|
|
|
2833
|
|
|
2834 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2835 return 0;
|
|
|
2836 slot = handler_type_from_function_symbol (funsym, 1);
|
|
|
2837 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND
|
|
|
2838 && slot != MAGIC_HANDLER_MAKE_LOCAL)
|
|
|
2839 /* #### temporary kludge because we haven't implemented
|
|
|
2840 lisp-magic variables completely */
|
|
|
2841 return 0;
|
|
|
2842 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]);
|
|
|
2843 }
|
|
|
2844
|
|
|
2845 static Lisp_Object
|
|
|
2846 fetch_value_maybe_past_magic (Lisp_Object sym,
|
|
|
2847 Lisp_Object follow_past_lisp_magic)
|
|
|
2848 {
|
|
|
2849 Lisp_Object value = XSYMBOL (sym)->value;
|
|
|
2850 if (SYMBOL_VALUE_LISP_MAGIC_P (value)
|
|
|
2851 && (EQ (follow_past_lisp_magic, Qt)
|
|
|
2852 || (!NILP (follow_past_lisp_magic)
|
|
|
2853 && !would_be_magic_handled (sym, follow_past_lisp_magic))))
|
|
|
2854 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed;
|
|
|
2855 return value;
|
|
|
2856 }
|
|
|
2857
|
|
|
2858 static Lisp_Object *
|
|
|
2859 value_slot_past_magic (Lisp_Object sym)
|
|
|
2860 {
|
|
|
2861 Lisp_Object *store_pointer = &XSYMBOL (sym)->value;
|
|
|
2862
|
|
|
2863 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer))
|
|
|
2864 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed;
|
|
|
2865 return store_pointer;
|
|
|
2866 }
|
|
|
2867
|
|
|
2868 static Lisp_Object
|
|
|
2869 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...)
|
|
|
2870 {
|
|
|
2871 va_list vargs;
|
|
|
2872 Lisp_Object args[20]; /* should be enough ... */
|
|
|
2873 int i;
|
|
|
2874 enum lisp_magic_handler htype;
|
|
|
2875 Lisp_Object legerdemain;
|
|
|
2876 struct symbol_value_lisp_magic *bfwd;
|
|
|
2877
|
|
440
|
2878 assert (nargs >= 0 && nargs < countof (args));
|
|
428
|
2879 legerdemain = XSYMBOL (sym)->value;
|
|
|
2880 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain));
|
|
|
2881 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain);
|
|
|
2882
|
|
|
2883 va_start (vargs, nargs);
|
|
|
2884 for (i = 0; i < nargs; i++)
|
|
|
2885 args[i] = va_arg (vargs, Lisp_Object);
|
|
|
2886 va_end (vargs);
|
|
|
2887
|
|
|
2888 htype = handler_type_from_function_symbol (funsym, 1);
|
|
|
2889 if (NILP (bfwd->handler[htype]))
|
|
|
2890 return Qunbound;
|
|
|
2891 /* #### should be reusing the arglist, not always consing anew.
|
|
|
2892 Repeated handler invocations should not cause repeated consing.
|
|
|
2893 Doesn't matter for now, because this is just a quick implementation
|
|
|
2894 for obsolescence support. */
|
|
|
2895 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym,
|
|
|
2896 bfwd->harg[htype], Qnil);
|
|
|
2897 }
|
|
|
2898
|
|
|
2899 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler,
|
|
|
2900 3, 5, 0, /*
|
|
|
2901 Don't you dare use this.
|
|
|
2902 If you do, suffer the wrath of Ben, who is likely to rename
|
|
|
2903 this function (or change the semantics of its arguments) without
|
|
|
2904 pity, thereby invalidating your code.
|
|
|
2905 */
|
|
|
2906 (variable, handler_type, handler, harg, keep_existing))
|
|
|
2907 {
|
|
|
2908 Lisp_Object valcontents;
|
|
|
2909 struct symbol_value_lisp_magic *bfwd;
|
|
|
2910 enum lisp_magic_handler htype;
|
|
|
2911 int i;
|
|
|
2912
|
|
|
2913 /* #### WARNING, only some handler types are implemented. See above.
|
|
|
2914 Actions of other types will ignore a handler if it's there.
|
|
|
2915
|
|
|
2916 #### Also, `chain-to-symbol-value-handler' and
|
|
|
2917 `symbol-function-corresponding-function' are not implemented. */
|
|
|
2918 CHECK_SYMBOL (variable);
|
|
|
2919 CHECK_SYMBOL (handler_type);
|
|
|
2920 htype = decode_magic_handler_type (handler_type);
|
|
|
2921 valcontents = XSYMBOL (variable)->value;
|
|
|
2922 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2923 {
|
|
|
2924 bfwd = alloc_lcrecord_type (struct symbol_value_lisp_magic,
|
|
|
2925 &lrecord_symbol_value_lisp_magic);
|
|
|
2926 bfwd->magic.type = SYMVAL_LISP_MAGIC;
|
|
|
2927 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2928 {
|
|
|
2929 bfwd->handler[i] = Qnil;
|
|
|
2930 bfwd->harg[i] = Qnil;
|
|
|
2931 }
|
|
|
2932 bfwd->shadowed = valcontents;
|
|
|
2933 XSETSYMBOL_VALUE_MAGIC (XSYMBOL (variable)->value, bfwd);
|
|
|
2934 }
|
|
|
2935 else
|
|
|
2936 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents);
|
|
|
2937 bfwd->handler[htype] = handler;
|
|
|
2938 bfwd->harg[htype] = harg;
|
|
|
2939
|
|
|
2940 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2941 if (!NILP (bfwd->handler[i]))
|
|
|
2942 break;
|
|
|
2943
|
|
|
2944 if (i == MAGIC_HANDLER_MAX)
|
|
|
2945 /* there are no remaining handlers, so remove the structure. */
|
|
|
2946 XSYMBOL (variable)->value = bfwd->shadowed;
|
|
|
2947
|
|
|
2948 return Qnil;
|
|
|
2949 }
|
|
|
2950
|
|
|
2951
|
|
|
2952 /* functions for working with variable aliases. */
|
|
|
2953
|
|
|
2954 /* Follow the chain of variable aliases for SYMBOL. Return the
|
|
|
2955 resulting symbol, whose value cell is guaranteed not to be a
|
|
|
2956 symbol-value-varalias.
|
|
|
2957
|
|
|
2958 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias.
|
|
|
2959 If FUNSYM is t, always follow in such a case. If FUNSYM is nil,
|
|
|
2960 never follow; stop right there. Otherwise FUNSYM should be a
|
|
|
2961 recognized symbol-value function symbol; this means, follow
|
|
|
2962 unless there is a special handler for the named function.
|
|
|
2963
|
|
|
2964 OK, there is at least one reason why it's necessary for
|
|
|
2965 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we
|
|
|
2966 can always be sure to catch cyclic variable aliasing. If we never
|
|
|
2967 follow past Lisp magic, then if the following is done:
|
|
|
2968
|
|
|
2969 (defvaralias 'a 'b)
|
|
|
2970 add some magic behavior to a, but not a "get-value" handler
|
|
|
2971 (defvaralias 'b 'a)
|
|
|
2972
|
|
|
2973 then an attempt to retrieve a's or b's value would cause infinite
|
|
|
2974 looping in `symbol-value'.
|
|
|
2975
|
|
|
2976 We (of course) can't always follow past Lisp magic, because then
|
|
|
2977 we make any variable that is lisp-magic -> varalias behave as if
|
|
|
2978 the lisp-magic is not present at all.
|
|
|
2979 */
|
|
|
2980
|
|
|
2981 static Lisp_Object
|
|
|
2982 follow_varalias_pointers (Lisp_Object symbol,
|
|
|
2983 Lisp_Object follow_past_lisp_magic)
|
|
|
2984 {
|
|
|
2985 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16
|
|
|
2986 Lisp_Object tortoise, hare, val;
|
|
|
2987 int count;
|
|
|
2988
|
|
|
2989 /* quick out just in case */
|
|
|
2990 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value))
|
|
|
2991 return symbol;
|
|
|
2992
|
|
|
2993 /* Compare implementation of indirect_function(). */
|
|
|
2994 for (hare = tortoise = symbol, count = 0;
|
|
|
2995 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic),
|
|
|
2996 SYMBOL_VALUE_VARALIAS_P (val);
|
|
|
2997 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)),
|
|
|
2998 count++)
|
|
|
2999 {
|
|
|
3000 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue;
|
|
|
3001
|
|
|
3002 if (count & 1)
|
|
|
3003 tortoise = symbol_value_varalias_aliasee
|
|
|
3004 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic
|
|
|
3005 (tortoise, follow_past_lisp_magic)));
|
|
|
3006 if (EQ (hare, tortoise))
|
|
|
3007 return Fsignal (Qcyclic_variable_indirection, list1 (symbol));
|
|
|
3008 }
|
|
|
3009
|
|
|
3010 return hare;
|
|
|
3011 }
|
|
|
3012
|
|
|
3013 DEFUN ("defvaralias", Fdefvaralias, 2, 2, 0, /*
|
|
|
3014 Define a variable as an alias for another variable.
|
|
|
3015 Thenceforth, any operations performed on VARIABLE will actually be
|
|
|
3016 performed on ALIAS. Both VARIABLE and ALIAS should be symbols.
|
|
|
3017 If ALIAS is nil, remove any aliases for VARIABLE.
|
|
|
3018 ALIAS can itself be aliased, and the chain of variable aliases
|
|
|
3019 will be followed appropriately.
|
|
|
3020 If VARIABLE already has a value, this value will be shadowed
|
|
|
3021 until the alias is removed, at which point it will be restored.
|
|
|
3022 Currently VARIABLE cannot be a built-in variable, a variable that
|
|
|
3023 has a buffer-local value in any buffer, or the symbols nil or t.
|
|
|
3024 \(ALIAS, however, can be any type of variable.)
|
|
|
3025 */
|
|
|
3026 (variable, alias))
|
|
|
3027 {
|
|
|
3028 struct symbol_value_varalias *bfwd;
|
|
|
3029 Lisp_Object valcontents;
|
|
|
3030
|
|
|
3031 CHECK_SYMBOL (variable);
|
|
|
3032 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
3033
|
|
|
3034 valcontents = XSYMBOL (variable)->value;
|
|
|
3035
|
|
|
3036 if (NILP (alias))
|
|
|
3037 {
|
|
|
3038 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3039 {
|
|
|
3040 XSYMBOL (variable)->value =
|
|
|
3041 symbol_value_varalias_shadowed
|
|
|
3042 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3043 }
|
|
|
3044 return Qnil;
|
|
|
3045 }
|
|
|
3046
|
|
|
3047 CHECK_SYMBOL (alias);
|
|
|
3048 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3049 {
|
|
|
3050 /* transmogrify */
|
|
|
3051 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = alias;
|
|
|
3052 return Qnil;
|
|
|
3053 }
|
|
|
3054
|
|
|
3055 if (SYMBOL_VALUE_MAGIC_P (valcontents)
|
|
|
3056 && !UNBOUNDP (valcontents))
|
|
|
3057 signal_simple_error ("Variable is magic and cannot be aliased", variable);
|
|
|
3058 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
3059
|
|
|
3060 bfwd = alloc_lcrecord_type (struct symbol_value_varalias,
|
|
|
3061 &lrecord_symbol_value_varalias);
|
|
|
3062 bfwd->magic.type = SYMVAL_VARALIAS;
|
|
|
3063 bfwd->aliasee = alias;
|
|
|
3064 bfwd->shadowed = valcontents;
|
|
|
3065
|
|
|
3066 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
3067 XSYMBOL (variable)->value = valcontents;
|
|
|
3068 return Qnil;
|
|
|
3069 }
|
|
|
3070
|
|
|
3071 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /*
|
|
|
3072 If VARIABLE is aliased to another variable, return that variable.
|
|
|
3073 VARIABLE should be a symbol. If VARIABLE is not aliased, return nil.
|
|
|
3074 Variable aliases are created with `defvaralias'. See also
|
|
|
3075 `indirect-variable'.
|
|
|
3076 */
|
|
|
3077 (variable, follow_past_lisp_magic))
|
|
|
3078 {
|
|
|
3079 Lisp_Object valcontents;
|
|
|
3080
|
|
|
3081 CHECK_SYMBOL (variable);
|
|
|
3082 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3083 {
|
|
|
3084 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
|
3085 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
|
3086 }
|
|
|
3087
|
|
|
3088 valcontents = fetch_value_maybe_past_magic (variable,
|
|
|
3089 follow_past_lisp_magic);
|
|
|
3090
|
|
|
3091 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3092 return symbol_value_varalias_aliasee
|
|
|
3093 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3094 else
|
|
|
3095 return Qnil;
|
|
|
3096 }
|
|
|
3097
|
|
|
3098 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /*
|
|
|
3099 Return the variable at the end of OBJECT's variable-alias chain.
|
|
|
3100 If OBJECT is a symbol, follow all variable aliases and return
|
|
|
3101 the final (non-aliased) symbol. Variable aliases are created with
|
|
|
3102 the function `defvaralias'.
|
|
|
3103 If OBJECT is not a symbol, just return it.
|
|
|
3104 Signal a cyclic-variable-indirection error if there is a loop in the
|
|
|
3105 variable chain of symbols.
|
|
|
3106 */
|
|
|
3107 (object, follow_past_lisp_magic))
|
|
|
3108 {
|
|
|
3109 if (!SYMBOLP (object))
|
|
|
3110 return object;
|
|
|
3111 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3112 {
|
|
|
3113 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
|
3114 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
|
3115 }
|
|
|
3116 return follow_varalias_pointers (object, follow_past_lisp_magic);
|
|
|
3117 }
|
|
|
3118
|
|
|
3119
|
|
|
3120 /************************************************************************/
|
|
|
3121 /* initialization */
|
|
|
3122 /************************************************************************/
|
|
|
3123
|
|
|
3124 /* A dumped XEmacs image has a lot more than 1511 symbols. Last
|
|
|
3125 estimate was that there were actually around 6300. So let's try
|
|
|
3126 making this bigger and see if we get better hashing behavior. */
|
|
|
3127 #define OBARRAY_SIZE 16411
|
|
|
3128
|
|
|
3129 #ifndef Qzero
|
|
|
3130 Lisp_Object Qzero;
|
|
|
3131 #endif
|
|
|
3132 #ifndef Qnull_pointer
|
|
|
3133 Lisp_Object Qnull_pointer;
|
|
|
3134 #endif
|
|
|
3135
|
|
|
3136 /* some losing systems can't have static vars at function scope... */
|
|
442
|
3137 static const struct symbol_value_magic guts_of_unbound_marker =
|
|
|
3138 { /* struct symbol_value_magic */
|
|
|
3139 { /* struct lcrecord_header */
|
|
|
3140 { /* struct lrecord_header */
|
|
|
3141 lrecord_type_symbol_value_forward, /* lrecord_type_index */
|
|
|
3142 1, /* mark bit */
|
|
|
3143 1, /* c_readonly bit */
|
|
|
3144 1, /* lisp_readonly bit */
|
|
|
3145 },
|
|
|
3146 0, /* next */
|
|
|
3147 0, /* uid */
|
|
|
3148 0, /* free */
|
|
|
3149 },
|
|
|
3150 0, /* value */
|
|
|
3151 SYMVAL_UNBOUND_MARKER
|
|
|
3152 };
|
|
428
|
3153
|
|
|
3154 void
|
|
|
3155 init_symbols_once_early (void)
|
|
|
3156 {
|
|
442
|
3157 INIT_LRECORD_IMPLEMENTATION (symbol);
|
|
|
3158 INIT_LRECORD_IMPLEMENTATION (symbol_value_forward);
|
|
|
3159 INIT_LRECORD_IMPLEMENTATION (symbol_value_buffer_local);
|
|
|
3160 INIT_LRECORD_IMPLEMENTATION (symbol_value_lisp_magic);
|
|
|
3161 INIT_LRECORD_IMPLEMENTATION (symbol_value_varalias);
|
|
|
3162
|
|
440
|
3163 reinit_symbols_once_early ();
|
|
428
|
3164
|
|
|
3165 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is
|
|
|
3166 called the first time. */
|
|
442
|
3167 Qnil = Fmake_symbol (make_string_nocopy ((const Bufbyte *) "nil", 3));
|
|
428
|
3168 XSYMBOL (Qnil)->name->plist = Qnil;
|
|
|
3169 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihil */
|
|
|
3170 XSYMBOL (Qnil)->plist = Qnil;
|
|
|
3171
|
|
|
3172 Vobarray = make_vector (OBARRAY_SIZE, Qzero);
|
|
|
3173 initial_obarray = Vobarray;
|
|
|
3174 staticpro (&initial_obarray);
|
|
|
3175 /* Intern nil in the obarray */
|
|
|
3176 {
|
|
|
3177 int hash = hash_string (string_data (XSYMBOL (Qnil)->name), 3);
|
|
|
3178 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil;
|
|
|
3179 }
|
|
|
3180
|
|
|
3181 {
|
|
|
3182 /* Required to get around a GCC syntax error on certain
|
|
|
3183 architectures */
|
|
442
|
3184 const struct symbol_value_magic *tem = &guts_of_unbound_marker;
|
|
428
|
3185
|
|
|
3186 XSETSYMBOL_VALUE_MAGIC (Qunbound, tem);
|
|
|
3187 }
|
|
|
3188
|
|
|
3189 XSYMBOL (Qnil)->function = Qunbound;
|
|
|
3190
|
|
|
3191 defsymbol (&Qt, "t");
|
|
444
|
3192 XSYMBOL (Qt)->value = Qt; /* Veritas aeterna */
|
|
428
|
3193 Vquit_flag = Qnil;
|
|
|
3194
|
|
|
3195 pdump_wire (&Qnil);
|
|
|
3196 pdump_wire (&Qunbound);
|
|
|
3197 pdump_wire (&Vquit_flag);
|
|
|
3198 }
|
|
|
3199
|
|
|
3200 void
|
|
440
|
3201 reinit_symbols_once_early (void)
|
|
|
3202 {
|
|
|
3203 #ifndef Qzero
|
|
|
3204 Qzero = make_int (0); /* Only used if Lisp_Object is a union type */
|
|
|
3205 #endif
|
|
|
3206
|
|
|
3207 #ifndef Qnull_pointer
|
|
|
3208 /* C guarantees that Qnull_pointer will be initialized to all 0 bits,
|
|
|
3209 so the following is actually a no-op. */
|
|
442
|
3210 XSETOBJ (Qnull_pointer, 0);
|
|
440
|
3211 #endif
|
|
|
3212 }
|
|
|
3213
|
|
442
|
3214 static void
|
|
|
3215 defsymbol_massage_name_1 (Lisp_Object *location, const char *name, int dump_p,
|
|
|
3216 int multiword_predicate_p)
|
|
|
3217 {
|
|
|
3218 char temp[500];
|
|
|
3219 int len = strlen (name) - 1;
|
|
|
3220 int i;
|
|
|
3221
|
|
|
3222 if (multiword_predicate_p)
|
|
|
3223 assert (len + 1 < sizeof (temp));
|
|
|
3224 else
|
|
|
3225 assert (len < sizeof (temp));
|
|
|
3226 strcpy (temp, name + 1); /* Remove initial Q */
|
|
|
3227 if (multiword_predicate_p)
|
|
|
3228 {
|
|
|
3229 strcpy (temp + len - 1, "_p");
|
|
|
3230 len++;
|
|
|
3231 }
|
|
|
3232 for (i = 0; i < len; i++)
|
|
|
3233 if (temp[i] == '_')
|
|
|
3234 temp[i] = '-';
|
|
|
3235 *location = Fintern (make_string ((const Bufbyte *) temp, len), Qnil);
|
|
|
3236 if (dump_p)
|
|
|
3237 staticpro (location);
|
|
|
3238 else
|
|
|
3239 staticpro_nodump (location);
|
|
|
3240 }
|
|
|
3241
|
|
440
|
3242 void
|
|
442
|
3243 defsymbol_massage_name_nodump (Lisp_Object *location, const char *name)
|
|
|
3244 {
|
|
|
3245 defsymbol_massage_name_1 (location, name, 0, 0);
|
|
|
3246 }
|
|
|
3247
|
|
|
3248 void
|
|
|
3249 defsymbol_massage_name (Lisp_Object *location, const char *name)
|
|
428
|
3250 {
|
|
442
|
3251 defsymbol_massage_name_1 (location, name, 1, 0);
|
|
|
3252 }
|
|
|
3253
|
|
|
3254 void
|
|
|
3255 defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location,
|
|
|
3256 const char *name)
|
|
|
3257 {
|
|
|
3258 defsymbol_massage_name_1 (location, name, 0, 1);
|
|
|
3259 }
|
|
|
3260
|
|
|
3261 void
|
|
|
3262 defsymbol_massage_multiword_predicate (Lisp_Object *location, const char *name)
|
|
|
3263 {
|
|
|
3264 defsymbol_massage_name_1 (location, name, 1, 1);
|
|
|
3265 }
|
|
|
3266
|
|
|
3267 void
|
|
|
3268 defsymbol_nodump (Lisp_Object *location, const char *name)
|
|
|
3269 {
|
|
|
3270 *location = Fintern (make_string_nocopy ((const Bufbyte *) name,
|
|
428
|
3271 strlen (name)),
|
|
|
3272 Qnil);
|
|
|
3273 staticpro_nodump (location);
|
|
|
3274 }
|
|
|
3275
|
|
|
3276 void
|
|
442
|
3277 defsymbol (Lisp_Object *location, const char *name)
|
|
428
|
3278 {
|
|
442
|
3279 *location = Fintern (make_string_nocopy ((const Bufbyte *) name,
|
|
428
|
3280 strlen (name)),
|
|
|
3281 Qnil);
|
|
|
3282 staticpro (location);
|
|
|
3283 }
|
|
|
3284
|
|
|
3285 void
|
|
442
|
3286 defkeyword (Lisp_Object *location, const char *name)
|
|
428
|
3287 {
|
|
|
3288 defsymbol (location, name);
|
|
|
3289 Fset (*location, *location);
|
|
|
3290 }
|
|
|
3291
|
|
442
|
3292 void
|
|
|
3293 defkeyword_massage_name (Lisp_Object *location, const char *name)
|
|
|
3294 {
|
|
|
3295 char temp[500];
|
|
|
3296 int len = strlen (name);
|
|
|
3297
|
|
|
3298 assert (len < sizeof (temp));
|
|
|
3299 strcpy (temp, name);
|
|
|
3300 temp[1] = ':'; /* it's an underscore in the C variable */
|
|
|
3301
|
|
|
3302 defsymbol_massage_name (location, temp);
|
|
|
3303 Fset (*location, *location);
|
|
|
3304 }
|
|
|
3305
|
|
428
|
3306 #ifdef DEBUG_XEMACS
|
|
|
3307 /* Check that nobody spazzed writing a DEFUN. */
|
|
|
3308 static void
|
|
|
3309 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym)
|
|
|
3310 {
|
|
|
3311 assert (subr->min_args >= 0);
|
|
|
3312 assert (subr->min_args <= SUBR_MAX_ARGS);
|
|
|
3313
|
|
|
3314 if (subr->max_args != MANY &&
|
|
|
3315 subr->max_args != UNEVALLED)
|
|
|
3316 {
|
|
|
3317 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */
|
|
|
3318 assert (subr->max_args <= SUBR_MAX_ARGS);
|
|
|
3319 assert (subr->min_args <= subr->max_args);
|
|
|
3320 }
|
|
|
3321
|
|
|
3322 assert (UNBOUNDP (XSYMBOL (sym)->function));
|
|
|
3323 }
|
|
|
3324 #else
|
|
|
3325 #define check_sane_subr(subr, sym) /* nothing */
|
|
|
3326 #endif
|
|
|
3327
|
|
|
3328 #ifdef HAVE_SHLIB
|
|
|
3329 /*
|
|
|
3330 * If we are not in a pure undumped Emacs, we need to make a duplicate of
|
|
|
3331 * the subr. This is because the only time this function will be called
|
|
|
3332 * in a running Emacs is when a dynamically loaded module is adding a
|
|
|
3333 * subr, and we need to make sure that the subr is in allocated, Lisp-
|
|
|
3334 * accessible memory. The address assigned to the static subr struct
|
|
|
3335 * in the shared object will be a trampoline address, so we need to create
|
|
|
3336 * a copy here to ensure that a real address is used.
|
|
|
3337 *
|
|
|
3338 * Once we have copied everything across, we re-use the original static
|
|
|
3339 * structure to store a pointer to the newly allocated one. This will be
|
|
|
3340 * used in emodules.c by emodules_doc_subr() to find a pointer to the
|
|
442
|
3341 * allocated object so that we can set its doc string properly.
|
|
428
|
3342 *
|
|
442
|
3343 * NOTE: We don't actually use the DOC pointer here any more, but we did
|
|
428
|
3344 * in an earlier implementation of module support. There is no harm in
|
|
|
3345 * setting it here in case we ever need it in future implementations.
|
|
|
3346 * subr->doc will point to the new subr structure that was allocated.
|
|
442
|
3347 * Code can then get this value from the static subr structure and use
|
|
428
|
3348 * it if required.
|
|
|
3349 *
|
|
442
|
3350 * FIXME: Should newsubr be staticpro()'ed? I don't think so but I need
|
|
428
|
3351 * a guru to check.
|
|
|
3352 */
|
|
440
|
3353 #define check_module_subr() \
|
|
|
3354 do { \
|
|
|
3355 if (initialized) { \
|
|
|
3356 Lisp_Subr *newsubr = (Lisp_Subr *) xmalloc (sizeof (Lisp_Subr)); \
|
|
|
3357 memcpy (newsubr, subr, sizeof (Lisp_Subr)); \
|
|
442
|
3358 subr->doc = (const char *)newsubr; \
|
|
440
|
3359 subr = newsubr; \
|
|
|
3360 } \
|
|
428
|
3361 } while (0)
|
|
|
3362 #else /* ! HAVE_SHLIB */
|
|
|
3363 #define check_module_subr()
|
|
|
3364 #endif
|
|
|
3365
|
|
|
3366 void
|
|
|
3367 defsubr (Lisp_Subr *subr)
|
|
|
3368 {
|
|
|
3369 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3370 Lisp_Object fun;
|
|
|
3371
|
|
|
3372 check_sane_subr (subr, sym);
|
|
|
3373 check_module_subr ();
|
|
|
3374
|
|
|
3375 XSETSUBR (fun, subr);
|
|
|
3376 XSYMBOL (sym)->function = fun;
|
|
|
3377 }
|
|
|
3378
|
|
|
3379 /* Define a lisp macro using a Lisp_Subr. */
|
|
|
3380 void
|
|
|
3381 defsubr_macro (Lisp_Subr *subr)
|
|
|
3382 {
|
|
|
3383 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3384 Lisp_Object fun;
|
|
|
3385
|
|
|
3386 check_sane_subr (subr, sym);
|
|
|
3387 check_module_subr();
|
|
|
3388
|
|
|
3389 XSETSUBR (fun, subr);
|
|
|
3390 XSYMBOL (sym)->function = Fcons (Qmacro, fun);
|
|
|
3391 }
|
|
|
3392
|
|
442
|
3393 static void
|
|
|
3394 deferror_1 (Lisp_Object *symbol, const char *name, const char *messuhhj,
|
|
|
3395 Lisp_Object inherits_from, int massage_p)
|
|
428
|
3396 {
|
|
|
3397 Lisp_Object conds;
|
|
442
|
3398 if (massage_p)
|
|
|
3399 defsymbol_massage_name (symbol, name);
|
|
|
3400 else
|
|
|
3401 defsymbol (symbol, name);
|
|
428
|
3402
|
|
|
3403 assert (SYMBOLP (inherits_from));
|
|
|
3404 conds = Fget (inherits_from, Qerror_conditions, Qnil);
|
|
|
3405 Fput (*symbol, Qerror_conditions, Fcons (*symbol, conds));
|
|
|
3406 /* NOT build_translated_string (). This function is called at load time
|
|
|
3407 and the string needs to get translated at run time. (This happens
|
|
|
3408 in the function (display-error) in cmdloop.el.) */
|
|
|
3409 Fput (*symbol, Qerror_message, build_string (messuhhj));
|
|
|
3410 }
|
|
|
3411
|
|
|
3412 void
|
|
442
|
3413 deferror (Lisp_Object *symbol, const char *name, const char *messuhhj,
|
|
|
3414 Lisp_Object inherits_from)
|
|
|
3415 {
|
|
|
3416 deferror_1 (symbol, name, messuhhj, inherits_from, 0);
|
|
|
3417 }
|
|
|
3418
|
|
|
3419 void
|
|
|
3420 deferror_massage_name (Lisp_Object *symbol, const char *name,
|
|
|
3421 const char *messuhhj, Lisp_Object inherits_from)
|
|
|
3422 {
|
|
|
3423 deferror_1 (symbol, name, messuhhj, inherits_from, 1);
|
|
|
3424 }
|
|
|
3425
|
|
|
3426 void
|
|
|
3427 deferror_massage_name_and_message (Lisp_Object *symbol, const char *name,
|
|
|
3428 Lisp_Object inherits_from)
|
|
|
3429 {
|
|
|
3430 char temp[500];
|
|
|
3431 int i;
|
|
|
3432 int len = strlen (name) - 1;
|
|
|
3433
|
|
|
3434 assert (len < sizeof (temp));
|
|
|
3435 strcpy (temp, name + 1); /* Remove initial Q */
|
|
|
3436 temp[0] = toupper (temp[0]);
|
|
|
3437 for (i = 0; i < len; i++)
|
|
|
3438 if (temp[i] == '_')
|
|
|
3439 temp[i] = ' ';
|
|
|
3440
|
|
|
3441 deferror_1 (symbol, name, temp, inherits_from, 1);
|
|
|
3442 }
|
|
|
3443
|
|
|
3444 void
|
|
428
|
3445 syms_of_symbols (void)
|
|
|
3446 {
|
|
442
|
3447 DEFSYMBOL (Qvariable_documentation);
|
|
|
3448 DEFSYMBOL (Qvariable_domain); /* I18N3 */
|
|
|
3449 DEFSYMBOL (Qad_advice_info);
|
|
|
3450 DEFSYMBOL (Qad_activate);
|
|
|
3451
|
|
|
3452 DEFSYMBOL (Qget_value);
|
|
|
3453 DEFSYMBOL (Qset_value);
|
|
|
3454 DEFSYMBOL (Qbound_predicate);
|
|
|
3455 DEFSYMBOL (Qmake_unbound);
|
|
|
3456 DEFSYMBOL (Qlocal_predicate);
|
|
|
3457 DEFSYMBOL (Qmake_local);
|
|
|
3458
|
|
|
3459 DEFSYMBOL (Qboundp);
|
|
|
3460 DEFSYMBOL (Qglobally_boundp);
|
|
|
3461 DEFSYMBOL (Qmakunbound);
|
|
|
3462 DEFSYMBOL (Qsymbol_value);
|
|
|
3463 DEFSYMBOL (Qset);
|
|
|
3464 DEFSYMBOL (Qsetq_default);
|
|
|
3465 DEFSYMBOL (Qdefault_boundp);
|
|
|
3466 DEFSYMBOL (Qdefault_value);
|
|
|
3467 DEFSYMBOL (Qset_default);
|
|
|
3468 DEFSYMBOL (Qmake_variable_buffer_local);
|
|
|
3469 DEFSYMBOL (Qmake_local_variable);
|
|
|
3470 DEFSYMBOL (Qkill_local_variable);
|
|
|
3471 DEFSYMBOL (Qkill_console_local_variable);
|
|
|
3472 DEFSYMBOL (Qsymbol_value_in_buffer);
|
|
|
3473 DEFSYMBOL (Qsymbol_value_in_console);
|
|
|
3474 DEFSYMBOL (Qlocal_variable_p);
|
|
|
3475
|
|
|
3476 DEFSYMBOL (Qconst_integer);
|
|
|
3477 DEFSYMBOL (Qconst_boolean);
|
|
|
3478 DEFSYMBOL (Qconst_object);
|
|
|
3479 DEFSYMBOL (Qconst_specifier);
|
|
|
3480 DEFSYMBOL (Qdefault_buffer);
|
|
|
3481 DEFSYMBOL (Qcurrent_buffer);
|
|
|
3482 DEFSYMBOL (Qconst_current_buffer);
|
|
|
3483 DEFSYMBOL (Qdefault_console);
|
|
|
3484 DEFSYMBOL (Qselected_console);
|
|
|
3485 DEFSYMBOL (Qconst_selected_console);
|
|
428
|
3486
|
|
|
3487 DEFSUBR (Fintern);
|
|
|
3488 DEFSUBR (Fintern_soft);
|
|
|
3489 DEFSUBR (Funintern);
|
|
|
3490 DEFSUBR (Fmapatoms);
|
|
|
3491 DEFSUBR (Fapropos_internal);
|
|
|
3492
|
|
|
3493 DEFSUBR (Fsymbol_function);
|
|
|
3494 DEFSUBR (Fsymbol_plist);
|
|
|
3495 DEFSUBR (Fsymbol_name);
|
|
|
3496 DEFSUBR (Fmakunbound);
|
|
|
3497 DEFSUBR (Ffmakunbound);
|
|
|
3498 DEFSUBR (Fboundp);
|
|
|
3499 DEFSUBR (Fglobally_boundp);
|
|
|
3500 DEFSUBR (Ffboundp);
|
|
|
3501 DEFSUBR (Ffset);
|
|
|
3502 DEFSUBR (Fdefine_function);
|
|
|
3503 Ffset (intern ("defalias"), intern ("define-function"));
|
|
|
3504 DEFSUBR (Fsetplist);
|
|
|
3505 DEFSUBR (Fsymbol_value_in_buffer);
|
|
|
3506 DEFSUBR (Fsymbol_value_in_console);
|
|
|
3507 DEFSUBR (Fbuilt_in_variable_type);
|
|
|
3508 DEFSUBR (Fsymbol_value);
|
|
|
3509 DEFSUBR (Fset);
|
|
|
3510 DEFSUBR (Fdefault_boundp);
|
|
|
3511 DEFSUBR (Fdefault_value);
|
|
|
3512 DEFSUBR (Fset_default);
|
|
|
3513 DEFSUBR (Fsetq_default);
|
|
|
3514 DEFSUBR (Fmake_variable_buffer_local);
|
|
|
3515 DEFSUBR (Fmake_local_variable);
|
|
|
3516 DEFSUBR (Fkill_local_variable);
|
|
|
3517 DEFSUBR (Fkill_console_local_variable);
|
|
|
3518 DEFSUBR (Flocal_variable_p);
|
|
|
3519 DEFSUBR (Fdefvaralias);
|
|
|
3520 DEFSUBR (Fvariable_alias);
|
|
|
3521 DEFSUBR (Findirect_variable);
|
|
|
3522 DEFSUBR (Fdontusethis_set_symbol_value_handler);
|
|
|
3523 }
|
|
|
3524
|
|
|
3525 /* Create and initialize a Lisp variable whose value is forwarded to C data */
|
|
|
3526 void
|
|
442
|
3527 defvar_magic (const char *symbol_name, const struct symbol_value_forward *magic)
|
|
428
|
3528 {
|
|
442
|
3529 Lisp_Object sym;
|
|
428
|
3530
|
|
|
3531 #if defined(HAVE_SHLIB)
|
|
|
3532 /*
|
|
|
3533 * As with defsubr(), this will only be called in a dumped Emacs when
|
|
|
3534 * we are adding variables from a dynamically loaded module. That means
|
|
|
3535 * we can't use purespace. Take that into account.
|
|
|
3536 */
|
|
|
3537 if (initialized)
|
|
|
3538 sym = Fintern (build_string (symbol_name), Qnil);
|
|
|
3539 else
|
|
|
3540 #endif
|
|
442
|
3541 sym = Fintern (make_string_nocopy ((const Bufbyte *) symbol_name,
|
|
428
|
3542 strlen (symbol_name)), Qnil);
|
|
|
3543
|
|
442
|
3544 XSETOBJ (XSYMBOL (sym)->value, magic);
|
|
428
|
3545 }
|
|
|
3546
|
|
|
3547 void
|
|
|
3548 vars_of_symbols (void)
|
|
|
3549 {
|
|
|
3550 DEFVAR_LISP ("obarray", &Vobarray /*
|
|
|
3551 Symbol table for use by `intern' and `read'.
|
|
|
3552 It is a vector whose length ought to be prime for best results.
|
|
|
3553 The vector's contents don't make sense if examined from Lisp programs;
|
|
|
3554 to find all the symbols in an obarray, use `mapatoms'.
|
|
|
3555 */ );
|
|
|
3556 /* obarray has been initialized long before */
|
|
|
3557 }
|
