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0
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1 /* "intern" and friends -- moved here from lread.c and data.c
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2 Copyright (C) 1985-1989, 1992-1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Ben Wing.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.30. */
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23
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24 /* This file has been Mule-ized. */
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25
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26 /* NOTE:
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27
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28 The value cell of a symbol can contain a simple value or one of
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29 various symbol-value-magic objects. Some of these objects can
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30 chain into other kinds of objects. Here is a table of possibilities:
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31
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32 1a) simple value
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33 1b) Qunbound
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34 1c) symbol-value-forward, excluding Qunbound
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35 2) symbol-value-buffer-local -> 1a or 1b or 1c
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36 3) symbol-value-lisp-magic -> 1a or 1b or 1c
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37 4) symbol-value-lisp-magic -> symbol-value-buffer-local -> 1a or 1b or 1c
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38 5) symbol-value-varalias
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39 6) symbol-value-lisp-magic -> symbol-value-varalias
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40
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41 The "chain" of a symbol-value-buffer-local is its current_value slot.
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42
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43 The "chain" of a symbol-value-lisp-magic is its shadowed slot, which
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44 applies for handler types without associated handlers.
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45
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46 All other fields in all the structures (including the "shadowed" slot
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47 in a symbol-value-varalias) can *only* contain a simple value or Qunbound.
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48
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49 */
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50
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51 /* #### Ugh, though, this file does awful things with symbol-value-magic
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52 objects. This ought to be cleaned up. */
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53
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54 #include <config.h>
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55 #include "lisp.h"
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56
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57 #include "buffer.h" /* for Vbuffer_defaults */
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58 #include "console.h"
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380
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59 #include "elhash.h"
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247
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60
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0
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61 Lisp_Object Qad_advice_info, Qad_activate;
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62
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63 Lisp_Object Qget_value, Qset_value, Qbound_predicate, Qmake_unbound;
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64 Lisp_Object Qlocal_predicate, Qmake_local;
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65
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412
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66 Lisp_Object Qboundp, Qfboundp, Qglobally_boundp, Qmakunbound;
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0
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67 Lisp_Object Qsymbol_value, Qset, Qdefault_boundp, Qdefault_value;
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380
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68 Lisp_Object Qset_default, Qsetq_default;
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69 Lisp_Object Qmake_variable_buffer_local, Qmake_local_variable;
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0
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70 Lisp_Object Qkill_local_variable, Qkill_console_local_variable;
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71 Lisp_Object Qsymbol_value_in_buffer, Qsymbol_value_in_console;
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72 Lisp_Object Qlocal_variable_p;
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73
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74 Lisp_Object Qconst_integer, Qconst_boolean, Qconst_object;
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75 Lisp_Object Qconst_specifier;
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76 Lisp_Object Qdefault_buffer, Qcurrent_buffer, Qconst_current_buffer;
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77 Lisp_Object Qdefault_console, Qselected_console, Qconst_selected_console;
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78
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79 static Lisp_Object maybe_call_magic_handler (Lisp_Object sym,
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80 Lisp_Object funsym,
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81 int nargs, ...);
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82 static Lisp_Object fetch_value_maybe_past_magic (Lisp_Object sym,
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380
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83 Lisp_Object follow_past_lisp_magic);
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0
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84 static Lisp_Object *value_slot_past_magic (Lisp_Object sym);
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380
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85 static Lisp_Object follow_varalias_pointers (Lisp_Object symbol,
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86 Lisp_Object follow_past_lisp_magic);
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0
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87
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88
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89 static Lisp_Object
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412
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90 mark_symbol (Lisp_Object obj, void (*markobj) (Lisp_Object))
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0
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91 {
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412
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92 struct Lisp_Symbol *sym = XSYMBOL (obj);
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0
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93 Lisp_Object pname;
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94
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412
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95 markobj (sym->value);
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96 markobj (sym->function);
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0
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97 XSETSTRING (pname, sym->name);
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412
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98 markobj (pname);
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0
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99 if (!symbol_next (sym))
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173
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100 return sym->plist;
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0
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101 else
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102 {
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412
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103 markobj (sym->plist);
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0
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104 /* Mark the rest of the symbols in the obarray hash-chain */
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105 sym = symbol_next (sym);
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106 XSETSYMBOL (obj, sym);
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173
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107 return obj;
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0
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108 }
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109 }
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110
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412
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111 DEFINE_BASIC_LRECORD_IMPLEMENTATION ("symbol", symbol,
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112 mark_symbol, print_symbol, 0, 0, 0,
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113 struct Lisp_Symbol);
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0
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114
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115
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116 /**********************************************************************/
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117 /* Intern */
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118 /**********************************************************************/
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119
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120 /* #### using a vector here is way bogus. Use a hash table instead. */
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121
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122 Lisp_Object Vobarray;
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123
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124 static Lisp_Object initial_obarray;
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125
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126 /* oblookup stores the bucket number here, for the sake of Funintern. */
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127
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128 static int oblookup_last_bucket_number;
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129
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130 static Lisp_Object
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131 check_obarray (Lisp_Object obarray)
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132 {
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173
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133 while (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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0
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134 {
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135 /* If Vobarray is now invalid, force it to be valid. */
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136 if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
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137
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138 obarray = wrong_type_argument (Qvectorp, obarray);
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139 }
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140 return obarray;
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141 }
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142
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143 Lisp_Object
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412
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144 intern (CONST char *str)
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0
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145 {
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146 Bytecount len = strlen (str);
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412
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147 CONST Bufbyte *buf = (CONST Bufbyte *) str;
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0
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148 Lisp_Object obarray = Vobarray;
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380
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149
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173
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150 if (!VECTORP (obarray) || XVECTOR_LENGTH (obarray) == 0)
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0
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151 obarray = check_obarray (obarray);
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380
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152
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153 {
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154 Lisp_Object tem = oblookup (obarray, buf, len);
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155 if (SYMBOLP (tem))
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156 return tem;
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157 }
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158
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398
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159 return Fintern (make_string (buf, len), obarray);
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0
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160 }
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161
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20
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162 DEFUN ("intern", Fintern, 1, 2, 0, /*
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0
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163 Return the canonical symbol whose name is STRING.
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164 If there is none, one is created by this function and returned.
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165 A second optional argument specifies the obarray to use;
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166 it defaults to the value of `obarray'.
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20
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167 */
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380
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168 (string, obarray))
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0
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169 {
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398
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170 Lisp_Object object, *ptr;
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412
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171 struct Lisp_Symbol *symbol;
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0
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172 Bytecount len;
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173
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174 if (NILP (obarray)) obarray = Vobarray;
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175 obarray = check_obarray (obarray);
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176
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380
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177 CHECK_STRING (string);
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178
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179 len = XSTRING_LENGTH (string);
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398
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180 object = oblookup (obarray, XSTRING_DATA (string), len);
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181 if (!INTP (object))
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0
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182 /* Found it */
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398
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183 return object;
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184
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185 ptr = &XVECTOR_DATA (obarray)[XINT (object)];
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186
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187 object = Fmake_symbol (string);
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188 symbol = XSYMBOL (object);
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0
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189
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190 if (SYMBOLP (*ptr))
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398
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191 symbol_next (symbol) = XSYMBOL (*ptr);
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0
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192 else
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398
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193 symbol_next (symbol) = 0;
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194 *ptr = object;
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195
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196 if (string_byte (symbol_name (symbol), 0) == ':' && EQ (obarray, Vobarray))
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197 {
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198 /* The LISP way is to put keywords in their own package, but we
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199 don't have packages, so we do something simpler. Someday,
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200 maybe we'll have packages and then this will be reworked.
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201 --Stig. */
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202 symbol_value (symbol) = object;
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203 }
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204
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205 return object;
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0
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206 }
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207
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20
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208 DEFUN ("intern-soft", Fintern_soft, 1, 2, 0, /*
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398
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209 Return the canonical symbol named NAME, or nil if none exists.
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210 NAME may be a string or a symbol. If it is a symbol, that exact
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211 symbol is searched for.
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0
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212 A second optional argument specifies the obarray to use;
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213 it defaults to the value of `obarray'.
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20
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214 */
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398
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215 (name, obarray))
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0
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216 {
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398
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217 /* #### Bug! (intern-soft "nil") returns nil. Perhaps we should
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218 add a DEFAULT-IF-NOT-FOUND arg, like in get. */
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0
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219 Lisp_Object tem;
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412
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220 struct Lisp_String *string;
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0
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221
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222 if (NILP (obarray)) obarray = Vobarray;
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223 obarray = check_obarray (obarray);
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224
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398
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225 if (!SYMBOLP (name))
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226 {
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227 CHECK_STRING (name);
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228 string = XSTRING (name);
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229 }
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230 else
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231 string = symbol_name (XSYMBOL (name));
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232
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233 tem = oblookup (obarray, string_data (string), string_length (string));
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234 if (INTP (tem) || (SYMBOLP (name) && !EQ (name, tem)))
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235 return Qnil;
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236 else
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237 return tem;
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0
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238 }
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239
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20
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240 DEFUN ("unintern", Funintern, 1, 2, 0, /*
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0
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241 Delete the symbol named NAME, if any, from OBARRAY.
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242 The value is t if a symbol was found and deleted, nil otherwise.
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243 NAME may be a string or a symbol. If it is a symbol, that symbol
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244 is deleted, if it belongs to OBARRAY--no other symbol is deleted.
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245 OBARRAY defaults to the value of the variable `obarray'
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20
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246 */
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247 (name, obarray))
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0
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248 {
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398
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249 Lisp_Object tem;
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412
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250 struct Lisp_String *string;
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0
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251 int hash;
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252
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253 if (NILP (obarray)) obarray = Vobarray;
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254 obarray = check_obarray (obarray);
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255
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256 if (SYMBOLP (name))
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398
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257 string = symbol_name (XSYMBOL (name));
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0
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258 else
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259 {
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260 CHECK_STRING (name);
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398
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261 string = XSTRING (name);
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0
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262 }
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263
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398
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264 tem = oblookup (obarray, string_data (string), string_length (string));
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0
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265 if (INTP (tem))
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266 return Qnil;
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267 /* If arg was a symbol, don't delete anything but that symbol itself. */
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268 if (SYMBOLP (name) && !EQ (name, tem))
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269 return Qnil;
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270
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271 hash = oblookup_last_bucket_number;
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272
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173
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273 if (EQ (XVECTOR_DATA (obarray)[hash], tem))
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0
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274 {
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275 if (XSYMBOL (tem)->next)
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173
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276 XSETSYMBOL (XVECTOR_DATA (obarray)[hash], XSYMBOL (tem)->next);
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0
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277 else
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173
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278 XVECTOR_DATA (obarray)[hash] = Qzero;
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0
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279 }
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280 else
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281 {
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282 Lisp_Object tail, following;
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283
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173
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284 for (tail = XVECTOR_DATA (obarray)[hash];
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0
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285 XSYMBOL (tail)->next;
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286 tail = following)
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287 {
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288 XSETSYMBOL (following, XSYMBOL (tail)->next);
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289 if (EQ (following, tem))
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290 {
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291 XSYMBOL (tail)->next = XSYMBOL (following)->next;
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292 break;
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293 }
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294 }
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295 }
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296 return Qt;
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297 }
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298
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299 /* Return the symbol in OBARRAY whose names matches the string
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300 of SIZE characters at PTR. If there is no such symbol in OBARRAY,
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380
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301 return the index into OBARRAY that the string hashes to.
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0
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302
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303 Also store the bucket number in oblookup_last_bucket_number. */
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304
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305 Lisp_Object
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412
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306 oblookup (Lisp_Object obarray, CONST Bufbyte *ptr, Bytecount size)
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0
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307 {
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308 int hash, obsize;
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412
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309 struct Lisp_Symbol *tail;
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0
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310 Lisp_Object bucket;
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311
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312 if (!VECTORP (obarray) ||
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173
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313 (obsize = XVECTOR_LENGTH (obarray)) == 0)
|
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0
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314 {
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315 obarray = check_obarray (obarray);
|
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173
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316 obsize = XVECTOR_LENGTH (obarray);
|
|
0
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317 }
|
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380
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318 hash = hash_string (ptr, size) % obsize;
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319 oblookup_last_bucket_number = hash;
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173
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320 bucket = XVECTOR_DATA (obarray)[hash];
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0
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321 if (ZEROP (bucket))
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322 ;
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323 else if (!SYMBOLP (bucket))
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324 error ("Bad data in guts of obarray"); /* Like CADR error message */
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325 else
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326 for (tail = XSYMBOL (bucket); ;)
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327 {
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|
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328 if (string_length (tail->name) == size &&
|
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329 !memcmp (string_data (tail->name), ptr, size))
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|
330 {
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331 XSETSYMBOL (bucket, tail);
|
|
173
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332 return bucket;
|
|
0
|
333 }
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334 tail = symbol_next (tail);
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335 if (!tail)
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336 break;
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|
|
337 }
|
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173
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338 return make_int (hash);
|
|
0
|
339 }
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|
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340
|
|
100
|
341 #if 0 /* Emacs 19.34 */
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|
0
|
342 int
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|
412
|
343 hash_string (CONST Bufbyte *ptr, Bytecount len)
|
|
0
|
344 {
|
|
412
|
345 CONST Bufbyte *p = ptr;
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|
|
346 CONST Bufbyte *end = p + len;
|
|
0
|
347 Bufbyte c;
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|
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348 int hash = 0;
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349
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|
|
350 while (p != end)
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|
|
351 {
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352 c = *p++;
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|
|
353 if (c >= 0140) c -= 40;
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354 hash = ((hash<<3) + (hash>>28) + c);
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|
|
355 }
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|
356 return hash & 07777777777;
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|
|
357 }
|
|
100
|
358 #endif
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|
|
359
|
|
|
360 /* derived from hashpjw, Dragon Book P436. */
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|
|
361 int
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|
412
|
362 hash_string (CONST Bufbyte *ptr, Bytecount len)
|
|
100
|
363 {
|
|
272
|
364 int hash = 0;
|
|
|
365
|
|
|
366 while (len-- > 0)
|
|
100
|
367 {
|
|
272
|
368 int g;
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|
|
369 hash = (hash << 4) + *ptr++;
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|
|
370 g = hash & 0xf0000000;
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|
|
371 if (g)
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|
|
372 hash = (hash ^ (g >> 24)) ^ g;
|
|
100
|
373 }
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|
|
374 return hash & 07777777777;
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|
|
375 }
|
|
0
|
376
|
|
227
|
377 /* Map FN over OBARRAY. The mapping is stopped when FN returns a
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|
378 non-zero value. */
|
|
0
|
379 void
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|
|
380 map_obarray (Lisp_Object obarray,
|
|
227
|
381 int (*fn) (Lisp_Object, void *), void *arg)
|
|
0
|
382 {
|
|
|
383 REGISTER int i;
|
|
227
|
384
|
|
0
|
385 CHECK_VECTOR (obarray);
|
|
173
|
386 for (i = XVECTOR_LENGTH (obarray) - 1; i >= 0; i--)
|
|
0
|
387 {
|
|
272
|
388 Lisp_Object tail = XVECTOR_DATA (obarray)[i];
|
|
0
|
389 if (SYMBOLP (tail))
|
|
|
390 while (1)
|
|
|
391 {
|
|
412
|
392 struct Lisp_Symbol *next;
|
|
227
|
393 if ((*fn) (tail, arg))
|
|
|
394 return;
|
|
0
|
395 next = symbol_next (XSYMBOL (tail));
|
|
|
396 if (!next)
|
|
|
397 break;
|
|
|
398 XSETSYMBOL (tail, next);
|
|
|
399 }
|
|
|
400 }
|
|
|
401 }
|
|
|
402
|
|
227
|
403 static int
|
|
|
404 mapatoms_1 (Lisp_Object sym, void *arg)
|
|
0
|
405 {
|
|
227
|
406 call1 (*(Lisp_Object *)arg, sym);
|
|
|
407 return 0;
|
|
0
|
408 }
|
|
|
409
|
|
20
|
410 DEFUN ("mapatoms", Fmapatoms, 1, 2, 0, /*
|
|
0
|
411 Call FUNCTION on every symbol in OBARRAY.
|
|
|
412 OBARRAY defaults to the value of `obarray'.
|
|
20
|
413 */
|
|
|
414 (function, obarray))
|
|
0
|
415 {
|
|
|
416 if (NILP (obarray))
|
|
|
417 obarray = Vobarray;
|
|
|
418 obarray = check_obarray (obarray);
|
|
|
419
|
|
227
|
420 map_obarray (obarray, mapatoms_1, &function);
|
|
0
|
421 return Qnil;
|
|
|
422 }
|
|
|
423
|
|
|
424
|
|
|
425 /**********************************************************************/
|
|
|
426 /* Apropos */
|
|
|
427 /**********************************************************************/
|
|
|
428
|
|
272
|
429 struct appropos_mapper_closure
|
|
|
430 {
|
|
227
|
431 Lisp_Object regexp;
|
|
|
432 Lisp_Object predicate;
|
|
|
433 Lisp_Object accumulation;
|
|
|
434 };
|
|
|
435
|
|
|
436 static int
|
|
|
437 apropos_mapper (Lisp_Object symbol, void *arg)
|
|
0
|
438 {
|
|
227
|
439 struct appropos_mapper_closure *closure =
|
|
272
|
440 (struct appropos_mapper_closure *) arg;
|
|
227
|
441 Bytecount match = fast_lisp_string_match (closure->regexp,
|
|
|
442 Fsymbol_name (symbol));
|
|
272
|
443
|
|
|
444 if (match >= 0 &&
|
|
|
445 (NILP (closure->predicate) ||
|
|
|
446 !NILP (call1 (closure->predicate, symbol))))
|
|
227
|
447 closure->accumulation = Fcons (symbol, closure->accumulation);
|
|
272
|
448
|
|
227
|
449 return 0;
|
|
0
|
450 }
|
|
|
451
|
|
20
|
452 DEFUN ("apropos-internal", Fapropos_internal, 1, 2, 0, /*
|
|
0
|
453 Show all symbols whose names contain match for REGEXP.
|
|
241
|
454 If optional 2nd arg PREDICATE is non-nil, (funcall PREDICATE SYMBOL)
|
|
|
455 is done for each symbol and a symbol is mentioned only if that
|
|
|
456 returns non-nil.
|
|
0
|
457 Return list of symbols found.
|
|
20
|
458 */
|
|
227
|
459 (regexp, predicate))
|
|
0
|
460 {
|
|
227
|
461 struct appropos_mapper_closure closure;
|
|
|
462
|
|
|
463 CHECK_STRING (regexp);
|
|
|
464
|
|
|
465 closure.regexp = regexp;
|
|
|
466 closure.predicate = predicate;
|
|
|
467 closure.accumulation = Qnil;
|
|
|
468 map_obarray (Vobarray, apropos_mapper, &closure);
|
|
|
469 closure.accumulation = Fsort (closure.accumulation, Qstring_lessp);
|
|
|
470 return closure.accumulation;
|
|
0
|
471 }
|
|
|
472
|
|
|
473
|
|
|
474 /* Extract and set components of symbols */
|
|
|
475
|
|
173
|
476 static void set_up_buffer_local_cache (Lisp_Object sym,
|
|
0
|
477 struct symbol_value_buffer_local *bfwd,
|
|
82
|
478 struct buffer *buf,
|
|
|
479 Lisp_Object new_alist_el,
|
|
|
480 int set_it_p);
|
|
0
|
481
|
|
20
|
482 DEFUN ("boundp", Fboundp, 1, 1, 0, /*
|
|
272
|
483 Return t if SYMBOL's value is not void.
|
|
20
|
484 */
|
|
380
|
485 (symbol))
|
|
0
|
486 {
|
|
380
|
487 CHECK_SYMBOL (symbol);
|
|
|
488 return UNBOUNDP (find_symbol_value (symbol)) ? Qnil : Qt;
|
|
0
|
489 }
|
|
|
490
|
|
20
|
491 DEFUN ("globally-boundp", Fglobally_boundp, 1, 1, 0, /*
|
|
272
|
492 Return t if SYMBOL has a global (non-bound) value.
|
|
0
|
493 This is for the byte-compiler; you really shouldn't be using this.
|
|
20
|
494 */
|
|
380
|
495 (symbol))
|
|
0
|
496 {
|
|
380
|
497 CHECK_SYMBOL (symbol);
|
|
|
498 return UNBOUNDP (top_level_value (symbol)) ? Qnil : Qt;
|
|
0
|
499 }
|
|
|
500
|
|
20
|
501 DEFUN ("fboundp", Ffboundp, 1, 1, 0, /*
|
|
272
|
502 Return t if SYMBOL's function definition is not void.
|
|
20
|
503 */
|
|
380
|
504 (symbol))
|
|
0
|
505 {
|
|
380
|
506 CHECK_SYMBOL (symbol);
|
|
|
507 return UNBOUNDP (XSYMBOL (symbol)->function) ? Qnil : Qt;
|
|
0
|
508 }
|
|
|
509
|
|
|
510 /* Return non-zero if SYM's value or function (the current contents of
|
|
|
511 which should be passed in as VAL) is constant, i.e. unsettable. */
|
|
|
512
|
|
|
513 static int
|
|
|
514 symbol_is_constant (Lisp_Object sym, Lisp_Object val)
|
|
|
515 {
|
|
|
516 /* #### - I wonder if it would be better to just have a new magic value
|
|
|
517 type and make nil, t, and all keywords have that same magic
|
|
|
518 constant_symbol value. This test is awfully specific about what is
|
|
|
519 constant and what isn't. --Stig */
|
|
272
|
520 if (EQ (sym, Qnil) ||
|
|
|
521 EQ (sym, Qt))
|
|
|
522 return 1;
|
|
|
523
|
|
|
524 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
525 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
526 {
|
|
|
527 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
528 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
529 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
530 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
531 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
532 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
533 return 1;
|
|
284
|
534 default: break; /* Warning suppression */
|
|
272
|
535 }
|
|
|
536
|
|
|
537 /* We don't return true for keywords here because they are handled
|
|
380
|
538 specially by reject_constant_symbols(). */
|
|
272
|
539 return 0;
|
|
0
|
540 }
|
|
|
541
|
|
|
542 /* We are setting SYM's value slot (or function slot, if FUNCTION_P is
|
|
267
|
543 non-zero) to NEWVAL. Make sure this is allowed.
|
|
|
544 FOLLOW_PAST_LISP_MAGIC specifies whether we delve past
|
|
|
545 symbol-value-lisp-magic objects. */
|
|
0
|
546
|
|
380
|
547 void
|
|
0
|
548 reject_constant_symbols (Lisp_Object sym, Lisp_Object newval, int function_p,
|
|
|
549 Lisp_Object follow_past_lisp_magic)
|
|
|
550 {
|
|
|
551 Lisp_Object val =
|
|
|
552 (function_p ? XSYMBOL (sym)->function
|
|
|
553 : fetch_value_maybe_past_magic (sym, follow_past_lisp_magic));
|
|
|
554
|
|
|
555 if (SYMBOL_VALUE_MAGIC_P (val) &&
|
|
80
|
556 XSYMBOL_VALUE_MAGIC_TYPE (val) == SYMVAL_CONST_SPECIFIER_FORWARD)
|
|
0
|
557 signal_simple_error ("Use `set-specifier' to change a specifier's value",
|
|
|
558 sym);
|
|
|
559
|
|
267
|
560 if (symbol_is_constant (sym, val)
|
|
398
|
561 || (SYMBOL_IS_KEYWORD (sym) && !EQ (newval, sym)))
|
|
80
|
562 signal_error (Qsetting_constant,
|
|
|
563 UNBOUNDP (newval) ? list1 (sym) : list2 (sym, newval));
|
|
0
|
564 }
|
|
|
565
|
|
|
566 /* Verify that it's ok to make SYM buffer-local. This rejects
|
|
|
567 constants and default-buffer-local variables. FOLLOW_PAST_LISP_MAGIC
|
|
|
568 specifies whether we delve into symbol-value-lisp-magic objects.
|
|
|
569 (Should be a symbol indicating what action is being taken; that way,
|
|
|
570 we don't delve if there's a handler for that action, but do otherwise.) */
|
|
|
571
|
|
|
572 static void
|
|
|
573 verify_ok_for_buffer_local (Lisp_Object sym,
|
|
|
574 Lisp_Object follow_past_lisp_magic)
|
|
|
575 {
|
|
|
576 Lisp_Object val = fetch_value_maybe_past_magic (sym, follow_past_lisp_magic);
|
|
|
577
|
|
272
|
578 if (symbol_is_constant (sym, val))
|
|
|
579 goto not_ok;
|
|
|
580 if (SYMBOL_VALUE_MAGIC_P (val))
|
|
|
581 switch (XSYMBOL_VALUE_MAGIC_TYPE (val))
|
|
|
582 {
|
|
|
583 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
584 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
585 /* #### It's theoretically possible for it to be reasonable
|
|
|
586 to have both console-local and buffer-local variables,
|
|
|
587 but I don't want to consider that right now. */
|
|
|
588 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
589 goto not_ok;
|
|
284
|
590 default: break; /* Warning suppression */
|
|
272
|
591 }
|
|
|
592
|
|
|
593 return;
|
|
|
594
|
|
|
595 not_ok:
|
|
|
596 signal_error (Qerror,
|
|
|
597 list2 (build_string ("Symbol may not be buffer-local"), sym));
|
|
0
|
598 }
|
|
|
599
|
|
20
|
600 DEFUN ("makunbound", Fmakunbound, 1, 1, 0, /*
|
|
0
|
601 Make SYMBOL's value be void.
|
|
20
|
602 */
|
|
380
|
603 (symbol))
|
|
0
|
604 {
|
|
380
|
605 Fset (symbol, Qunbound);
|
|
|
606 return symbol;
|
|
0
|
607 }
|
|
|
608
|
|
20
|
609 DEFUN ("fmakunbound", Ffmakunbound, 1, 1, 0, /*
|
|
0
|
610 Make SYMBOL's function definition be void.
|
|
20
|
611 */
|
|
380
|
612 (symbol))
|
|
0
|
613 {
|
|
380
|
614 CHECK_SYMBOL (symbol);
|
|
|
615 reject_constant_symbols (symbol, Qunbound, 1, Qt);
|
|
|
616 XSYMBOL (symbol)->function = Qunbound;
|
|
|
617 return symbol;
|
|
0
|
618 }
|
|
|
619
|
|
20
|
620 DEFUN ("symbol-function", Fsymbol_function, 1, 1, 0, /*
|
|
272
|
621 Return SYMBOL's function definition. Error if that is void.
|
|
20
|
622 */
|
|
|
623 (symbol))
|
|
0
|
624 {
|
|
|
625 CHECK_SYMBOL (symbol);
|
|
|
626 if (UNBOUNDP (XSYMBOL (symbol)->function))
|
|
380
|
627 signal_void_function_error (symbol);
|
|
0
|
628 return XSYMBOL (symbol)->function;
|
|
|
629 }
|
|
|
630
|
|
20
|
631 DEFUN ("symbol-plist", Fsymbol_plist, 1, 1, 0, /*
|
|
0
|
632 Return SYMBOL's property list.
|
|
20
|
633 */
|
|
380
|
634 (symbol))
|
|
0
|
635 {
|
|
380
|
636 CHECK_SYMBOL (symbol);
|
|
|
637 return XSYMBOL (symbol)->plist;
|
|
0
|
638 }
|
|
|
639
|
|
20
|
640 DEFUN ("symbol-name", Fsymbol_name, 1, 1, 0, /*
|
|
0
|
641 Return SYMBOL's name, a string.
|
|
20
|
642 */
|
|
380
|
643 (symbol))
|
|
0
|
644 {
|
|
|
645 Lisp_Object name;
|
|
|
646
|
|
380
|
647 CHECK_SYMBOL (symbol);
|
|
|
648 XSETSTRING (name, XSYMBOL (symbol)->name);
|
|
0
|
649 return name;
|
|
|
650 }
|
|
|
651
|
|
20
|
652 DEFUN ("fset", Ffset, 2, 2, 0, /*
|
|
167
|
653 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
20
|
654 */
|
|
380
|
655 (symbol, newdef))
|
|
0
|
656 {
|
|
|
657 /* This function can GC */
|
|
380
|
658 CHECK_SYMBOL (symbol);
|
|
|
659 reject_constant_symbols (symbol, newdef, 1, Qt);
|
|
|
660 if (!NILP (Vautoload_queue) && !UNBOUNDP (XSYMBOL (symbol)->function))
|
|
|
661 Vautoload_queue = Fcons (Fcons (symbol, XSYMBOL (symbol)->function),
|
|
0
|
662 Vautoload_queue);
|
|
380
|
663 XSYMBOL (symbol)->function = newdef;
|
|
0
|
664 /* Handle automatic advice activation */
|
|
380
|
665 if (CONSP (XSYMBOL (symbol)->plist) &&
|
|
|
666 !NILP (Fget (symbol, Qad_advice_info, Qnil)))
|
|
0
|
667 {
|
|
380
|
668 call2 (Qad_activate, symbol, Qnil);
|
|
|
669 newdef = XSYMBOL (symbol)->function;
|
|
0
|
670 }
|
|
|
671 return newdef;
|
|
|
672 }
|
|
|
673
|
|
|
674 /* FSFmacs */
|
|
20
|
675 DEFUN ("define-function", Fdefine_function, 2, 2, 0, /*
|
|
167
|
676 Set SYMBOL's function definition to NEWDEF, and return NEWDEF.
|
|
0
|
677 Associates the function with the current load file, if any.
|
|
20
|
678 */
|
|
380
|
679 (symbol, newdef))
|
|
0
|
680 {
|
|
|
681 /* This function can GC */
|
|
380
|
682 Ffset (symbol, newdef);
|
|
|
683 LOADHIST_ATTACH (symbol);
|
|
0
|
684 return newdef;
|
|
|
685 }
|
|
|
686
|
|
|
687
|
|
20
|
688 DEFUN ("setplist", Fsetplist, 2, 2, 0, /*
|
|
167
|
689 Set SYMBOL's property list to NEWPLIST, and return NEWPLIST.
|
|
20
|
690 */
|
|
380
|
691 (symbol, newplist))
|
|
0
|
692 {
|
|
380
|
693 CHECK_SYMBOL (symbol);
|
|
167
|
694 #if 0 /* Inserted for debugging 6/28/1997 -slb */
|
|
|
695 /* Somebody is setting a property list of integer 0, who? */
|
|
|
696 /* Not this way apparently. */
|
|
|
697 if (EQ(newplist, Qzero)) abort();
|
|
|
698 #endif
|
|
|
699
|
|
380
|
700 XSYMBOL (symbol)->plist = newplist;
|
|
0
|
701 return newplist;
|
|
|
702 }
|
|
|
703
|
|
|
704
|
|
|
705 /**********************************************************************/
|
|
|
706 /* symbol-value */
|
|
|
707 /**********************************************************************/
|
|
|
708
|
|
|
709 /* If the contents of the value cell of a symbol is one of the following
|
|
|
710 three types of objects, then the symbol is "magic" in that setting
|
|
|
711 and retrieving its value doesn't just set or retrieve the raw
|
|
|
712 contents of the value cell. None of these objects can escape to
|
|
|
713 the user level, so there is no loss of generality.
|
|
|
714
|
|
|
715 If a symbol is "unbound", then the contents of its value cell is
|
|
284
|
716 Qunbound. Despite appearances, this is *not* a symbol, but is a
|
|
|
717 symbol-value-forward object. This is so that printing it results
|
|
380
|
718 in "INTERNAL OBJECT (XEmacs bug?)", in case it leaks to Lisp, somehow.
|
|
0
|
719
|
|
|
720 Logically all of the following objects are "symbol-value-magic"
|
|
|
721 objects, and there are some games played w.r.t. this (#### this
|
|
|
722 should be cleaned up). SYMBOL_VALUE_MAGIC_P is true for all of
|
|
|
723 the object types. XSYMBOL_VALUE_MAGIC_TYPE returns the type of
|
|
|
724 symbol-value-magic object. There are more than three types
|
|
|
725 returned by this macro: in particular, symbol-value-forward
|
|
|
726 has eight subtypes, and symbol-value-buffer-local has two. See
|
|
|
727 symeval.h.
|
|
|
728
|
|
|
729 1. symbol-value-forward
|
|
|
730
|
|
|
731 symbol-value-forward is used for variables whose actual contents
|
|
|
732 are stored in a C variable of some sort, and for Qunbound. The
|
|
|
733 lcheader.next field (which is only used to chain together free
|
|
|
734 lcrecords) holds a pointer to the actual C variable. Included
|
|
|
735 in this type are "buffer-local" variables that are actually
|
|
|
736 stored in the buffer object itself; in this case, the "pointer"
|
|
|
737 is an offset into the struct buffer structure.
|
|
|
738
|
|
|
739 The subtypes are as follows:
|
|
|
740
|
|
|
741 SYMVAL_OBJECT_FORWARD:
|
|
|
742 (declare with DEFVAR_LISP)
|
|
|
743 The value of this variable is stored in a C variable of type
|
|
|
744 "Lisp_Object". Setting this variable sets the C variable.
|
|
|
745 Accessing this variable retrieves a value from the C variable.
|
|
|
746 These variables can be buffer-local -- in this case, the
|
|
|
747 raw symbol-value field gets converted into a
|
|
|
748 symbol-value-buffer-local, whose "current_value" slot contains
|
|
|
749 the symbol-value-forward. (See below.)
|
|
|
750
|
|
|
751 SYMVAL_FIXNUM_FORWARD:
|
|
|
752 SYMVAL_BOOLEAN_FORWARD:
|
|
|
753 (declare with DEFVAR_INT or DEFVAR_BOOL)
|
|
|
754 Similar to SYMVAL_OBJECT_FORWARD except that the C variable
|
|
2
|
755 is of type "int" and is an integer or boolean, respectively.
|
|
0
|
756
|
|
|
757 SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
758 SYMVAL_CONST_FIXNUM_FORWARD:
|
|
|
759 SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
|
760 (declare with DEFVAR_CONST_LISP, DEFVAR_CONST_INT, or
|
|
|
761 DEFVAR_CONST_BOOL)
|
|
|
762 Similar to SYMVAL_OBJECT_FORWARD, SYMVAL_FIXNUM_FORWARD, or
|
|
|
763 SYMVAL_BOOLEAN_FORWARD, respectively, except that the value cannot
|
|
|
764 be changed.
|
|
|
765
|
|
|
766 SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
|
767 (declare with DEFVAR_SPECIFIER)
|
|
412
|
768 Exactly like SYMVAL_CONST_OBJECT_FORWARD except that error message
|
|
|
769 you get when attempting to set the value says to use
|
|
0
|
770 `set-specifier' instead.
|
|
|
771
|
|
|
772 SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
773 (declare with DEFVAR_BUFFER_LOCAL)
|
|
|
774 This is used for built-in buffer-local variables -- i.e.
|
|
|
775 Lisp variables whose value is stored in the "struct buffer".
|
|
|
776 Variables of this sort always forward into C "Lisp_Object"
|
|
|
777 fields (although there's no reason in principle that other
|
|
|
778 types for ints and booleans couldn't be added). Note that
|
|
|
779 some of these variables are automatically local in each
|
|
|
780 buffer, while some are only local when they become set
|
|
|
781 (similar to `make-variable-buffer-local'). In these latter
|
|
|
782 cases, of course, the default value shows through in all
|
|
|
783 buffers in which the variable doesn't have a local value.
|
|
|
784 This is implemented by making sure the "struct buffer" field
|
|
|
785 always contains the correct value (whether it's local or
|
|
|
786 a default) and maintaining a mask in the "struct buffer"
|
|
|
787 indicating which fields are local. When `set-default' is
|
|
|
788 called on a variable that's not always local to all buffers,
|
|
|
789 it loops through each buffer and sets the corresponding
|
|
|
790 field in each buffer without a local value for the field,
|
|
|
791 according to the mask.
|
|
|
792
|
|
|
793 Calling `make-local-variable' on a variable of this sort
|
|
|
794 only has the effect of maybe changing the current buffer's mask.
|
|
|
795 Calling `make-variable-buffer-local' on a variable of this
|
|
|
796 sort has no effect at all.
|
|
|
797
|
|
|
798 SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
799 (declare with DEFVAR_CONST_BUFFER_LOCAL)
|
|
|
800 Same as SYMVAL_CURRENT_BUFFER_FORWARD except that the
|
|
|
801 value cannot be set.
|
|
|
802
|
|
|
803 SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
804 (declare with DEFVAR_BUFFER_DEFAULTS)
|
|
|
805 This is used for the Lisp variables that contain the
|
|
|
806 default values of built-in buffer-local variables. Setting
|
|
|
807 or referencing one of these variables forwards into a slot
|
|
|
808 in the special struct buffer Vbuffer_defaults.
|
|
|
809
|
|
|
810 SYMVAL_UNBOUND_MARKER:
|
|
|
811 This is used for only one object, Qunbound.
|
|
|
812
|
|
|
813 SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
814 (declare with DEFVAR_CONSOLE_LOCAL)
|
|
|
815 This is used for built-in console-local variables -- i.e.
|
|
|
816 Lisp variables whose value is stored in the "struct console".
|
|
|
817 These work just like built-in buffer-local variables.
|
|
|
818 However, calling `make-local-variable' or
|
|
|
819 `make-variable-buffer-local' on one of these variables
|
|
|
820 is currently disallowed because that would entail having
|
|
|
821 both console-local and buffer-local variables, which is
|
|
|
822 trickier to implement.
|
|
173
|
823
|
|
0
|
824 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
825 (declare with DEFVAR_CONST_CONSOLE_LOCAL)
|
|
|
826 Same as SYMVAL_SELECTED_CONSOLE_FORWARD except that the
|
|
|
827 value cannot be set.
|
|
|
828
|
|
|
829 SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
830 (declare with DEFVAR_CONSOLE_DEFAULTS)
|
|
|
831 This is used for the Lisp variables that contain the
|
|
|
832 default values of built-in console-local variables. Setting
|
|
|
833 or referencing one of these variables forwards into a slot
|
|
|
834 in the special struct console Vconsole_defaults.
|
|
|
835
|
|
|
836
|
|
|
837 2. symbol-value-buffer-local
|
|
|
838
|
|
|
839 symbol-value-buffer-local is used for variables that have had
|
|
|
840 `make-local-variable' or `make-variable-buffer-local' applied
|
|
|
841 to them. This object contains an alist mapping buffers to
|
|
|
842 values. In addition, the object contains a "current value",
|
|
|
843 which is the value in some buffer. Whenever you access the
|
|
|
844 variable with `symbol-value' or set it with `set' or `setq',
|
|
|
845 things are switched around so that the "current value"
|
|
|
846 refers to the current buffer, if it wasn't already. This
|
|
|
847 way, repeated references to a variable in the same buffer
|
|
|
848 are almost as efficient as if the variable weren't buffer
|
|
|
849 local. Note that the alist may not be up-to-date w.r.t.
|
|
|
850 the buffer whose value is current, as the "current value"
|
|
|
851 cache is normally only flushed into the alist when the
|
|
|
852 buffer it refers to changes.
|
|
|
853
|
|
|
854 Note also that it is possible for `make-local-variable'
|
|
|
855 or `make-variable-buffer-local' to be called on a variable
|
|
|
856 that forwards into a C variable (i.e. a variable whose
|
|
|
857 value cell is a symbol-value-forward). In this case,
|
|
|
858 the value cell becomes a symbol-value-buffer-local (as
|
|
|
859 always), and the symbol-value-forward moves into
|
|
|
860 the "current value" cell in this object. Also, in
|
|
|
861 this case the "current value" *always* refers to the
|
|
|
862 current buffer, so that the values of the C variable
|
|
|
863 always is the correct value for the current buffer.
|
|
|
864 set_buffer_internal() automatically updates the current-value
|
|
|
865 cells of all buffer-local variables that forward into C
|
|
|
866 variables. (There is a list of all buffer-local variables
|
|
|
867 that is maintained for this and other purposes.)
|
|
|
868
|
|
|
869 Note that only certain types of `symbol-value-forward' objects
|
|
|
870 can find their way into the "current value" cell of a
|
|
|
871 `symbol-value-buffer-local' object: SYMVAL_OBJECT_FORWARD,
|
|
|
872 SYMVAL_FIXNUM_FORWARD, SYMVAL_BOOLEAN_FORWARD, and
|
|
|
873 SYMVAL_UNBOUND_MARKER. The SYMVAL_CONST_*_FORWARD cannot
|
|
|
874 be buffer-local because they are unsettable;
|
|
|
875 SYMVAL_DEFAULT_*_FORWARD cannot be buffer-local because that
|
|
|
876 makes no sense; making SYMVAL_CURRENT_BUFFER_FORWARD buffer-local
|
|
|
877 does not have much of an effect (it's already buffer-local); and
|
|
|
878 SYMVAL_SELECTED_CONSOLE_FORWARD cannot be buffer-local because
|
|
|
879 that's not currently implemented.
|
|
|
880
|
|
|
881
|
|
|
882 3. symbol-value-varalias
|
|
|
883
|
|
|
884 A symbol-value-varalias object is used for variables that
|
|
|
885 are aliases for other variables. This object contains
|
|
|
886 the symbol that this variable is aliased to.
|
|
|
887 symbol-value-varalias objects cannot occur anywhere within
|
|
|
888 a symbol-value-buffer-local object, and most of the
|
|
|
889 low-level functions below do not accept them; you need
|
|
|
890 to call follow_varalias_pointers to get the actual
|
|
284
|
891 symbol to operate on. */
|
|
0
|
892
|
|
|
893 static Lisp_Object
|
|
412
|
894 mark_symbol_value_buffer_local (Lisp_Object obj,
|
|
|
895 void (*markobj) (Lisp_Object))
|
|
0
|
896 {
|
|
|
897 struct symbol_value_buffer_local *bfwd;
|
|
|
898
|
|
380
|
899 #ifdef ERROR_CHECK_TYPECHECK
|
|
0
|
900 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_BUFFER_LOCAL ||
|
|
|
901 XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_SOME_BUFFER_LOCAL);
|
|
380
|
902 #endif
|
|
0
|
903
|
|
|
904 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (obj);
|
|
412
|
905 markobj (bfwd->default_value);
|
|
|
906 markobj (bfwd->current_value);
|
|
|
907 markobj (bfwd->current_buffer);
|
|
173
|
908 return bfwd->current_alist_element;
|
|
0
|
909 }
|
|
|
910
|
|
|
911 static Lisp_Object
|
|
412
|
912 mark_symbol_value_lisp_magic (Lisp_Object obj,
|
|
|
913 void (*markobj) (Lisp_Object))
|
|
0
|
914 {
|
|
|
915 struct symbol_value_lisp_magic *bfwd;
|
|
|
916 int i;
|
|
|
917
|
|
|
918 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_LISP_MAGIC);
|
|
|
919
|
|
|
920 bfwd = XSYMBOL_VALUE_LISP_MAGIC (obj);
|
|
|
921 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
922 {
|
|
412
|
923 markobj (bfwd->handler[i]);
|
|
|
924 markobj (bfwd->harg[i]);
|
|
0
|
925 }
|
|
173
|
926 return bfwd->shadowed;
|
|
0
|
927 }
|
|
|
928
|
|
|
929 static Lisp_Object
|
|
412
|
930 mark_symbol_value_varalias (Lisp_Object obj,
|
|
|
931 void (*markobj) (Lisp_Object))
|
|
0
|
932 {
|
|
|
933 struct symbol_value_varalias *bfwd;
|
|
|
934
|
|
|
935 assert (XSYMBOL_VALUE_MAGIC_TYPE (obj) == SYMVAL_VARALIAS);
|
|
|
936
|
|
|
937 bfwd = XSYMBOL_VALUE_VARALIAS (obj);
|
|
412
|
938 markobj (bfwd->shadowed);
|
|
173
|
939 return bfwd->aliasee;
|
|
0
|
940 }
|
|
|
941
|
|
|
942 /* Should never, ever be called. (except by an external debugger) */
|
|
|
943 void
|
|
173
|
944 print_symbol_value_magic (Lisp_Object obj,
|
|
0
|
945 Lisp_Object printcharfun, int escapeflag)
|
|
|
946 {
|
|
|
947 char buf[200];
|
|
380
|
948 sprintf (buf, "#<INTERNAL OBJECT (XEmacs bug?) (%s type %d) 0x%lx>",
|
|
272
|
949 XRECORD_LHEADER_IMPLEMENTATION (obj)->name,
|
|
|
950 XSYMBOL_VALUE_MAGIC_TYPE (obj),
|
|
380
|
951 (long) XPNTR (obj));
|
|
0
|
952 write_c_string (buf, printcharfun);
|
|
|
953 }
|
|
|
954
|
|
272
|
955 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-forward",
|
|
|
956 symbol_value_forward,
|
|
412
|
957 this_one_is_unmarkable,
|
|
272
|
958 print_symbol_value_magic, 0, 0, 0,
|
|
|
959 struct symbol_value_forward);
|
|
|
960
|
|
|
961 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-buffer-local",
|
|
|
962 symbol_value_buffer_local,
|
|
|
963 mark_symbol_value_buffer_local,
|
|
|
964 print_symbol_value_magic, 0, 0, 0,
|
|
|
965 struct symbol_value_buffer_local);
|
|
|
966
|
|
|
967 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-lisp-magic",
|
|
|
968 symbol_value_lisp_magic,
|
|
|
969 mark_symbol_value_lisp_magic,
|
|
|
970 print_symbol_value_magic, 0, 0, 0,
|
|
|
971 struct symbol_value_lisp_magic);
|
|
|
972
|
|
|
973 DEFINE_LRECORD_IMPLEMENTATION ("symbol-value-varalias",
|
|
|
974 symbol_value_varalias,
|
|
|
975 mark_symbol_value_varalias,
|
|
|
976 print_symbol_value_magic, 0, 0, 0,
|
|
|
977 struct symbol_value_varalias);
|
|
|
978
|
|
0
|
979
|
|
|
980 /* Getting and setting values of symbols */
|
|
|
981
|
|
|
982 /* Given the raw contents of a symbol value cell, return the Lisp value of
|
|
|
983 the symbol. However, VALCONTENTS cannot be a symbol-value-buffer-local,
|
|
|
984 symbol-value-lisp-magic, or symbol-value-varalias.
|
|
|
985
|
|
|
986 BUFFER specifies a buffer, and is used for built-in buffer-local
|
|
|
987 variables, which are of type SYMVAL_CURRENT_BUFFER_FORWARD.
|
|
|
988 Note that such variables are never encapsulated in a
|
|
|
989 symbol-value-buffer-local structure.
|
|
|
990
|
|
|
991 CONSOLE specifies a console, and is used for built-in console-local
|
|
|
992 variables, which are of type SYMVAL_SELECTED_CONSOLE_FORWARD.
|
|
|
993 Note that such variables are (currently) never encapsulated in a
|
|
|
994 symbol-value-buffer-local structure.
|
|
|
995 */
|
|
|
996
|
|
|
997 static Lisp_Object
|
|
|
998 do_symval_forwarding (Lisp_Object valcontents, struct buffer *buffer,
|
|
|
999 struct console *console)
|
|
|
1000 {
|
|
412
|
1001 CONST struct symbol_value_forward *fwd;
|
|
0
|
1002
|
|
|
1003 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1004 return valcontents;
|
|
0
|
1005
|
|
|
1006 fwd = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1007 switch (fwd->magic.type)
|
|
|
1008 {
|
|
|
1009 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1010 case SYMVAL_CONST_FIXNUM_FORWARD:
|
|
173
|
1011 return make_int (*((int *)symbol_value_forward_forward (fwd)));
|
|
0
|
1012
|
|
|
1013 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1014 case SYMVAL_CONST_BOOLEAN_FORWARD:
|
|
173
|
1015 return *((int *)symbol_value_forward_forward (fwd)) ? Qt : Qnil;
|
|
0
|
1016
|
|
|
1017 case SYMVAL_OBJECT_FORWARD:
|
|
|
1018 case SYMVAL_CONST_OBJECT_FORWARD:
|
|
|
1019 case SYMVAL_CONST_SPECIFIER_FORWARD:
|
|
173
|
1020 return *((Lisp_Object *)symbol_value_forward_forward (fwd));
|
|
0
|
1021
|
|
|
1022 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1023 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1024 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1025 - (char *)&buffer_local_flags))));
|
|
|
1026
|
|
|
1027
|
|
|
1028 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1029 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD:
|
|
|
1030 assert (buffer);
|
|
|
1031 return (*((Lisp_Object *)((char *)buffer
|
|
|
1032 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1033 - (char *)&buffer_local_flags))));
|
|
|
1034
|
|
|
1035 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1036 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1037 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1038 - (char *)&console_local_flags))));
|
|
|
1039
|
|
|
1040 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1041 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD:
|
|
|
1042 assert (console);
|
|
|
1043 return (*((Lisp_Object *)((char *)console
|
|
|
1044 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1045 - (char *)&console_local_flags))));
|
|
|
1046
|
|
|
1047 case SYMVAL_UNBOUND_MARKER:
|
|
173
|
1048 return valcontents;
|
|
0
|
1049
|
|
|
1050 default:
|
|
|
1051 abort ();
|
|
|
1052 }
|
|
|
1053 return Qnil; /* suppress compiler warning */
|
|
|
1054 }
|
|
|
1055
|
|
|
1056 /* Set the value of default-buffer-local variable SYM to VALUE. */
|
|
|
1057
|
|
|
1058 static void
|
|
|
1059 set_default_buffer_slot_variable (Lisp_Object sym,
|
|
|
1060 Lisp_Object value)
|
|
|
1061 {
|
|
|
1062 /* Handle variables like case-fold-search that have special slots in
|
|
|
1063 the buffer. Make them work apparently like buffer_local variables.
|
|
|
1064 */
|
|
|
1065 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1066 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1067 have already called it. */
|
|
|
1068 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
412
|
1069 CONST struct symbol_value_forward *fwd
|
|
0
|
1070 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
1071 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
1072 - (char *) &buffer_local_flags);
|
|
|
1073 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1074 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1075 int flags) = symbol_value_forward_magicfun (fwd);
|
|
173
|
1076
|
|
0
|
1077 *((Lisp_Object *) (offset + (char *) XBUFFER (Vbuffer_defaults)))
|
|
|
1078 = value;
|
|
173
|
1079
|
|
0
|
1080 if (mask > 0) /* Not always per-buffer */
|
|
|
1081 {
|
|
380
|
1082 Lisp_Object elt;
|
|
173
|
1083
|
|
0
|
1084 /* Set value in each buffer which hasn't shadowed the default */
|
|
380
|
1085 LIST_LOOP_2 (elt, Vbuffer_alist)
|
|
0
|
1086 {
|
|
380
|
1087 struct buffer *b = XBUFFER (XCDR (elt));
|
|
0
|
1088 if (!(b->local_var_flags & mask))
|
|
|
1089 {
|
|
|
1090 if (magicfun)
|
|
380
|
1091 magicfun (sym, &value, make_buffer (b), 0);
|
|
173
|
1092 *((Lisp_Object *) (offset + (char *) b)) = value;
|
|
0
|
1093 }
|
|
|
1094 }
|
|
|
1095 }
|
|
|
1096 }
|
|
|
1097
|
|
|
1098 /* Set the value of default-console-local variable SYM to VALUE. */
|
|
|
1099
|
|
|
1100 static void
|
|
|
1101 set_default_console_slot_variable (Lisp_Object sym,
|
|
|
1102 Lisp_Object value)
|
|
|
1103 {
|
|
|
1104 /* Handle variables like case-fold-search that have special slots in
|
|
|
1105 the console. Make them work apparently like console_local variables.
|
|
|
1106 */
|
|
|
1107 /* At this point, the value cell may not contain a symbol-value-varalias
|
|
|
1108 or symbol-value-buffer-local, and if there's a handler, we should
|
|
|
1109 have already called it. */
|
|
|
1110 Lisp_Object valcontents = fetch_value_maybe_past_magic (sym, Qt);
|
|
412
|
1111 CONST struct symbol_value_forward *fwd
|
|
0
|
1112 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
1113 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
1114 - (char *) &console_local_flags);
|
|
|
1115 int mask = XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
1116 int (*magicfun) (Lisp_Object simm, Lisp_Object *val, Lisp_Object in_object,
|
|
|
1117 int flags) = symbol_value_forward_magicfun (fwd);
|
|
173
|
1118
|
|
0
|
1119 *((Lisp_Object *) (offset + (char *) XCONSOLE (Vconsole_defaults)))
|
|
|
1120 = value;
|
|
173
|
1121
|
|
0
|
1122 if (mask > 0) /* Not always per-console */
|
|
|
1123 {
|
|
380
|
1124 Lisp_Object console;
|
|
173
|
1125
|
|
0
|
1126 /* Set value in each console which hasn't shadowed the default */
|
|
380
|
1127 LIST_LOOP_2 (console, Vconsole_list)
|
|
0
|
1128 {
|
|
380
|
1129 struct console *d = XCONSOLE (console);
|
|
0
|
1130 if (!(d->local_var_flags & mask))
|
|
|
1131 {
|
|
|
1132 if (magicfun)
|
|
380
|
1133 magicfun (sym, &value, console, 0);
|
|
173
|
1134 *((Lisp_Object *) (offset + (char *) d)) = value;
|
|
0
|
1135 }
|
|
|
1136 }
|
|
|
1137 }
|
|
|
1138 }
|
|
|
1139
|
|
|
1140 /* Store NEWVAL into SYM.
|
|
|
1141
|
|
|
1142 SYM's value slot may *not* be types (5) or (6) above,
|
|
|
1143 i.e. no symbol-value-varalias objects. (You should have
|
|
|
1144 forwarded past all of these.)
|
|
|
1145
|
|
|
1146 SYM should not be an unsettable symbol or a symbol with
|
|
|
1147 a magic `set-value' handler (unless you want to explicitly
|
|
|
1148 ignore this handler).
|
|
|
1149
|
|
|
1150 OVALUE is the current value of SYM, but forwarded past any
|
|
|
1151 symbol-value-buffer-local and symbol-value-lisp-magic objects.
|
|
|
1152 (i.e. if SYM is a symbol-value-buffer-local, OVALUE should be
|
|
|
1153 the contents of its current-value cell.) NEWVAL may only be
|
|
|
1154 a simple value or Qunbound. If SYM is a symbol-value-buffer-local,
|
|
|
1155 this function will only modify its current-value cell, which should
|
|
|
1156 already be set up to point to the current buffer.
|
|
|
1157 */
|
|
|
1158
|
|
|
1159 static void
|
|
|
1160 store_symval_forwarding (Lisp_Object sym, Lisp_Object ovalue,
|
|
|
1161 Lisp_Object newval)
|
|
|
1162 {
|
|
|
1163 if (!SYMBOL_VALUE_MAGIC_P (ovalue) || UNBOUNDP (ovalue))
|
|
|
1164 {
|
|
|
1165 Lisp_Object *store_pointer = value_slot_past_magic (sym);
|
|
|
1166
|
|
|
1167 if (SYMBOL_VALUE_BUFFER_LOCAL_P (*store_pointer))
|
|
|
1168 store_pointer =
|
|
|
1169 &XSYMBOL_VALUE_BUFFER_LOCAL (*store_pointer)->current_value;
|
|
|
1170
|
|
|
1171 assert (UNBOUNDP (*store_pointer)
|
|
|
1172 || !SYMBOL_VALUE_MAGIC_P (*store_pointer));
|
|
|
1173 *store_pointer = newval;
|
|
|
1174 }
|
|
|
1175 else
|
|
|
1176 {
|
|
412
|
1177 CONST struct symbol_value_forward *fwd = XSYMBOL_VALUE_FORWARD (ovalue);
|
|
0
|
1178 int (*magicfun) (Lisp_Object simm, Lisp_Object *val,
|
|
380
|
1179 Lisp_Object in_object, int flags)
|
|
|
1180 = symbol_value_forward_magicfun (fwd);
|
|
|
1181
|
|
|
1182 switch (XSYMBOL_VALUE_MAGIC_TYPE (ovalue))
|
|
0
|
1183 {
|
|
|
1184 case SYMVAL_FIXNUM_FORWARD:
|
|
380
|
1185 CHECK_INT (newval);
|
|
|
1186 if (magicfun)
|
|
|
1187 magicfun (sym, &newval, Qnil, 0);
|
|
|
1188 *((int *) symbol_value_forward_forward (fwd)) = XINT (newval);
|
|
|
1189 return;
|
|
0
|
1190
|
|
|
1191 case SYMVAL_BOOLEAN_FORWARD:
|
|
380
|
1192 if (magicfun)
|
|
|
1193 magicfun (sym, &newval, Qnil, 0);
|
|
|
1194 *((int *) symbol_value_forward_forward (fwd))
|
|
412
|
1195 = ((NILP (newval)) ? 0 : 1);
|
|
380
|
1196 return;
|
|
0
|
1197
|
|
|
1198 case SYMVAL_OBJECT_FORWARD:
|
|
380
|
1199 if (magicfun)
|
|
|
1200 magicfun (sym, &newval, Qnil, 0);
|
|
|
1201 *((Lisp_Object *) symbol_value_forward_forward (fwd)) = newval;
|
|
|
1202 return;
|
|
173
|
1203
|
|
0
|
1204 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
380
|
1205 set_default_buffer_slot_variable (sym, newval);
|
|
|
1206 return;
|
|
0
|
1207
|
|
|
1208 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
380
|
1209 if (magicfun)
|
|
|
1210 magicfun (sym, &newval, make_buffer (current_buffer), 0);
|
|
|
1211 *((Lisp_Object *) ((char *) current_buffer
|
|
|
1212 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1213 - (char *) &buffer_local_flags)))
|
|
|
1214 = newval;
|
|
|
1215 return;
|
|
0
|
1216
|
|
|
1217 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
380
|
1218 set_default_console_slot_variable (sym, newval);
|
|
|
1219 return;
|
|
0
|
1220
|
|
|
1221 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
380
|
1222 if (magicfun)
|
|
|
1223 magicfun (sym, &newval, Vselected_console, 0);
|
|
|
1224 *((Lisp_Object *) ((char *) XCONSOLE (Vselected_console)
|
|
|
1225 + ((char *) symbol_value_forward_forward (fwd)
|
|
|
1226 - (char *) &console_local_flags)))
|
|
|
1227 = newval;
|
|
|
1228 return;
|
|
0
|
1229
|
|
|
1230 default:
|
|
|
1231 abort ();
|
|
|
1232 }
|
|
|
1233 }
|
|
|
1234 }
|
|
|
1235
|
|
|
1236 /* Given a per-buffer variable SYMBOL and its raw value-cell contents
|
|
|
1237 BFWD, locate and return a pointer to the element in BUFFER's
|
|
|
1238 local_var_alist for SYMBOL. The return value will be Qnil if
|
|
|
1239 BUFFER does not have its own value for SYMBOL (i.e. the default
|
|
|
1240 value is seen in that buffer).
|
|
|
1241 */
|
|
|
1242
|
|
|
1243 static Lisp_Object
|
|
|
1244 buffer_local_alist_element (struct buffer *buffer, Lisp_Object symbol,
|
|
|
1245 struct symbol_value_buffer_local *bfwd)
|
|
|
1246 {
|
|
|
1247 if (!NILP (bfwd->current_buffer) &&
|
|
|
1248 XBUFFER (bfwd->current_buffer) == buffer)
|
|
|
1249 /* This is just an optimization of the below. */
|
|
173
|
1250 return bfwd->current_alist_element;
|
|
0
|
1251 else
|
|
173
|
1252 return assq_no_quit (symbol, buffer->local_var_alist);
|
|
0
|
1253 }
|
|
|
1254
|
|
|
1255 /* [Remember that the slot that mirrors CURRENT-VALUE in the
|
|
|
1256 symbol-value-buffer-local of a per-buffer variable -- i.e. the
|
|
|
1257 slot in CURRENT-BUFFER's local_var_alist, or the DEFAULT-VALUE
|
|
|
1258 slot -- may be out of date.]
|
|
|
1259
|
|
|
1260 Write out any cached value in buffer-local variable SYMBOL's
|
|
|
1261 buffer-local structure, which is passed in as BFWD.
|
|
|
1262 */
|
|
|
1263
|
|
|
1264 static void
|
|
|
1265 write_out_buffer_local_cache (Lisp_Object symbol,
|
|
|
1266 struct symbol_value_buffer_local *bfwd)
|
|
|
1267 {
|
|
|
1268 if (!NILP (bfwd->current_buffer))
|
|
|
1269 {
|
|
|
1270 /* We pass 0 for BUFFER because only SYMVAL_CURRENT_BUFFER_FORWARD
|
|
|
1271 uses it, and that type cannot be inside a symbol-value-buffer-local */
|
|
|
1272 Lisp_Object cval = do_symval_forwarding (bfwd->current_value, 0, 0);
|
|
|
1273 if (NILP (bfwd->current_alist_element))
|
|
|
1274 /* current_value may be updated more recently than default_value */
|
|
|
1275 bfwd->default_value = cval;
|
|
|
1276 else
|
|
|
1277 Fsetcdr (bfwd->current_alist_element, cval);
|
|
|
1278 }
|
|
|
1279 }
|
|
|
1280
|
|
|
1281 /* SYM is a buffer-local variable, and BFWD is its buffer-local structure.
|
|
|
1282 Set up BFWD's cache for validity in buffer BUF. This assumes that
|
|
|
1283 the cache is currently in a consistent state (this can include
|
|
|
1284 not having any value cached, if BFWD->CURRENT_BUFFER is nil).
|
|
|
1285
|
|
|
1286 If the cache is already set up for BUF, this function does nothing
|
|
|
1287 at all.
|
|
|
1288
|
|
|
1289 Otherwise, if SYM forwards out to a C variable, this also forwards
|
|
|
1290 SYM's value in BUF out to the variable. Therefore, you generally
|
|
|
1291 only want to call this when BUF is, or is about to become, the
|
|
|
1292 current buffer.
|
|
|
1293
|
|
|
1294 (Otherwise, you can just retrieve the value without changing the
|
|
|
1295 cache, at the expense of slower retrieval.)
|
|
|
1296 */
|
|
|
1297
|
|
|
1298 static void
|
|
173
|
1299 set_up_buffer_local_cache (Lisp_Object sym,
|
|
0
|
1300 struct symbol_value_buffer_local *bfwd,
|
|
82
|
1301 struct buffer *buf,
|
|
|
1302 Lisp_Object new_alist_el,
|
|
|
1303 int set_it_p)
|
|
0
|
1304 {
|
|
82
|
1305 Lisp_Object new_val;
|
|
0
|
1306
|
|
|
1307 if (!NILP (bfwd->current_buffer)
|
|
|
1308 && buf == XBUFFER (bfwd->current_buffer))
|
|
|
1309 /* Cache is already set up. */
|
|
|
1310 return;
|
|
|
1311
|
|
|
1312 /* Flush out the old cache. */
|
|
|
1313 write_out_buffer_local_cache (sym, bfwd);
|
|
|
1314
|
|
|
1315 /* Retrieve the new alist element and new value. */
|
|
82
|
1316 if (NILP (new_alist_el)
|
|
|
1317 && set_it_p)
|
|
380
|
1318 new_alist_el = buffer_local_alist_element (buf, sym, bfwd);
|
|
82
|
1319
|
|
0
|
1320 if (NILP (new_alist_el))
|
|
|
1321 new_val = bfwd->default_value;
|
|
|
1322 else
|
|
|
1323 new_val = Fcdr (new_alist_el);
|
|
|
1324
|
|
|
1325 bfwd->current_alist_element = new_alist_el;
|
|
|
1326 XSETBUFFER (bfwd->current_buffer, buf);
|
|
|
1327
|
|
|
1328 /* Now store the value into the current-value slot.
|
|
|
1329 We don't simply write it there, because the current-value
|
|
|
1330 slot might be a forwarding pointer, in which case we need
|
|
|
1331 to instead write the value into the C variable.
|
|
|
1332
|
|
|
1333 We might also want to call a magic function.
|
|
|
1334
|
|
|
1335 So instead, we call this function. */
|
|
|
1336 store_symval_forwarding (sym, bfwd->current_value, new_val);
|
|
|
1337 }
|
|
|
1338
|
|
|
1339
|
|
|
1340 void
|
|
|
1341 kill_buffer_local_variables (struct buffer *buf)
|
|
|
1342 {
|
|
|
1343 Lisp_Object prev = Qnil;
|
|
|
1344 Lisp_Object alist;
|
|
|
1345
|
|
|
1346 /* Any which are supposed to be permanent,
|
|
|
1347 make local again, with the same values they had. */
|
|
173
|
1348
|
|
0
|
1349 for (alist = buf->local_var_alist; !NILP (alist); alist = XCDR (alist))
|
|
|
1350 {
|
|
|
1351 Lisp_Object sym = XCAR (XCAR (alist));
|
|
|
1352 struct symbol_value_buffer_local *bfwd;
|
|
|
1353 /* Variables with a symbol-value-varalias should not be here
|
|
|
1354 (we should have forwarded past them) and there must be a
|
|
|
1355 symbol-value-buffer-local. If there's a symbol-value-lisp-magic,
|
|
|
1356 just forward past it; if the variable has a handler, it was
|
|
|
1357 already called. */
|
|
|
1358 Lisp_Object value = fetch_value_maybe_past_magic (sym, Qt);
|
|
|
1359
|
|
|
1360 assert (SYMBOL_VALUE_BUFFER_LOCAL_P (value));
|
|
|
1361 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (value);
|
|
|
1362
|
|
|
1363 if (!NILP (Fget (sym, Qpermanent_local, Qnil)))
|
|
|
1364 /* prev points to the last alist element that is still
|
|
|
1365 staying around, so *only* update it now. This didn't
|
|
|
1366 used to be the case; this bug has been around since
|
|
|
1367 mly's rewrite two years ago! */
|
|
|
1368 prev = alist;
|
|
|
1369 else
|
|
|
1370 {
|
|
|
1371 /* Really truly kill it. */
|
|
|
1372 if (!NILP (prev))
|
|
|
1373 XCDR (prev) = XCDR (alist);
|
|
|
1374 else
|
|
|
1375 buf->local_var_alist = XCDR (alist);
|
|
|
1376
|
|
|
1377 /* We just effectively changed the value for this variable
|
|
|
1378 in BUF. So: */
|
|
|
1379
|
|
|
1380 /* (1) If the cache is caching BUF, invalidate the cache. */
|
|
|
1381 if (!NILP (bfwd->current_buffer) &&
|
|
|
1382 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1383 bfwd->current_buffer = Qnil;
|
|
|
1384
|
|
|
1385 /* (2) If we changed the value in current_buffer and this
|
|
|
1386 variable forwards to a C variable, we need to change the
|
|
|
1387 value of the C variable. set_up_buffer_local_cache()
|
|
|
1388 will do this. It doesn't hurt to do it whenever
|
|
|
1389 BUF == current_buffer, so just go ahead and do that. */
|
|
|
1390 if (buf == current_buffer)
|
|
82
|
1391 set_up_buffer_local_cache (sym, bfwd, buf, Qnil, 0);
|
|
0
|
1392 }
|
|
|
1393 }
|
|
|
1394 }
|
|
|
1395
|
|
|
1396 static Lisp_Object
|
|
|
1397 find_symbol_value_1 (Lisp_Object sym, struct buffer *buf,
|
|
82
|
1398 struct console *con, int swap_it_in,
|
|
|
1399 Lisp_Object symcons, int set_it_p)
|
|
0
|
1400 {
|
|
|
1401 Lisp_Object valcontents;
|
|
|
1402
|
|
|
1403 retry:
|
|
|
1404 valcontents = XSYMBOL (sym)->value;
|
|
|
1405
|
|
|
1406 retry_2:
|
|
|
1407 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1408 return valcontents;
|
|
0
|
1409
|
|
|
1410 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1411 {
|
|
|
1412 case SYMVAL_LISP_MAGIC:
|
|
|
1413 /* #### kludge */
|
|
|
1414 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1415 /* semi-change-o */
|
|
|
1416 goto retry_2;
|
|
|
1417
|
|
|
1418 case SYMVAL_VARALIAS:
|
|
|
1419 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
82
|
1420 symcons = Qnil;
|
|
0
|
1421 /* presto change-o! */
|
|
|
1422 goto retry;
|
|
|
1423
|
|
|
1424 case SYMVAL_BUFFER_LOCAL:
|
|
|
1425 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1426 {
|
|
|
1427 struct symbol_value_buffer_local *bfwd
|
|
|
1428 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1429
|
|
|
1430 if (swap_it_in)
|
|
|
1431 {
|
|
82
|
1432 set_up_buffer_local_cache (sym, bfwd, buf, symcons, set_it_p);
|
|
0
|
1433 valcontents = bfwd->current_value;
|
|
|
1434 }
|
|
|
1435 else
|
|
|
1436 {
|
|
|
1437 if (!NILP (bfwd->current_buffer) &&
|
|
|
1438 buf == XBUFFER (bfwd->current_buffer))
|
|
|
1439 valcontents = bfwd->current_value;
|
|
82
|
1440 else if (NILP (symcons))
|
|
0
|
1441 {
|
|
82
|
1442 if (set_it_p)
|
|
380
|
1443 valcontents = assq_no_quit (sym, buf->local_var_alist);
|
|
0
|
1444 if (NILP (valcontents))
|
|
|
1445 valcontents = bfwd->default_value;
|
|
|
1446 else
|
|
82
|
1447 valcontents = XCDR (valcontents);
|
|
0
|
1448 }
|
|
82
|
1449 else
|
|
|
1450 valcontents = XCDR (symcons);
|
|
0
|
1451 }
|
|
|
1452 break;
|
|
|
1453 }
|
|
173
|
1454
|
|
0
|
1455 default:
|
|
|
1456 break;
|
|
|
1457 }
|
|
173
|
1458 return do_symval_forwarding (valcontents, buf, con);
|
|
0
|
1459 }
|
|
|
1460
|
|
|
1461
|
|
|
1462 /* Find the value of a symbol in BUFFER, returning Qunbound if it's not
|
|
|
1463 bound. Note that it must not be possible to QUIT within this
|
|
|
1464 function. */
|
|
|
1465
|
|
|
1466 Lisp_Object
|
|
|
1467 symbol_value_in_buffer (Lisp_Object sym, Lisp_Object buffer)
|
|
|
1468 {
|
|
|
1469 struct buffer *buf;
|
|
|
1470
|
|
|
1471 CHECK_SYMBOL (sym);
|
|
|
1472
|
|
380
|
1473 if (NILP (buffer))
|
|
|
1474 buf = current_buffer;
|
|
|
1475 else
|
|
0
|
1476 {
|
|
|
1477 CHECK_BUFFER (buffer);
|
|
|
1478 buf = XBUFFER (buffer);
|
|
|
1479 }
|
|
|
1480
|
|
|
1481 return find_symbol_value_1 (sym, buf,
|
|
|
1482 /* If it bombs out at startup due to a
|
|
|
1483 Lisp error, this may be nil. */
|
|
|
1484 CONSOLEP (Vselected_console)
|
|
82
|
1485 ? XCONSOLE (Vselected_console) : 0, 0, Qnil, 1);
|
|
0
|
1486 }
|
|
|
1487
|
|
|
1488 static Lisp_Object
|
|
|
1489 symbol_value_in_console (Lisp_Object sym, Lisp_Object console)
|
|
|
1490 {
|
|
|
1491 CHECK_SYMBOL (sym);
|
|
|
1492
|
|
380
|
1493 if (NILP (console))
|
|
|
1494 console = Vselected_console;
|
|
|
1495 else
|
|
0
|
1496 CHECK_CONSOLE (console);
|
|
|
1497
|
|
82
|
1498 return find_symbol_value_1 (sym, current_buffer, XCONSOLE (console), 0,
|
|
|
1499 Qnil, 1);
|
|
0
|
1500 }
|
|
|
1501
|
|
|
1502 /* Return the current value of SYM. The difference between this function
|
|
|
1503 and calling symbol_value_in_buffer with a BUFFER of Qnil is that
|
|
|
1504 this updates the CURRENT_VALUE slot of buffer-local variables to
|
|
|
1505 point to the current buffer, while symbol_value_in_buffer doesn't. */
|
|
|
1506
|
|
|
1507 Lisp_Object
|
|
|
1508 find_symbol_value (Lisp_Object sym)
|
|
|
1509 {
|
|
|
1510 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1511 and Vselected_console is Qnil, early in initialization. */
|
|
380
|
1512 struct console *con;
|
|
195
|
1513 Lisp_Object valcontents;
|
|
0
|
1514
|
|
|
1515 CHECK_SYMBOL (sym);
|
|
195
|
1516
|
|
|
1517 valcontents = XSYMBOL (sym)->value;
|
|
|
1518 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1519 return valcontents;
|
|
|
1520
|
|
0
|
1521 if (CONSOLEP (Vselected_console))
|
|
380
|
1522 con = XCONSOLE (Vselected_console);
|
|
0
|
1523 else
|
|
|
1524 {
|
|
|
1525 /* This can also get called while we're preparing to shutdown.
|
|
|
1526 #### What should really happen in that case? Should we
|
|
|
1527 actually fix things so we can't get here in that case? */
|
|
|
1528 assert (!initialized || preparing_for_armageddon);
|
|
380
|
1529 con = 0;
|
|
0
|
1530 }
|
|
|
1531
|
|
380
|
1532 return find_symbol_value_1 (sym, current_buffer, con, 1, Qnil, 1);
|
|
82
|
1533 }
|
|
|
1534
|
|
|
1535 /* This is an optimized function for quick lookup of buffer local symbols
|
|
|
1536 by avoiding O(n) search. This will work when either:
|
|
|
1537 a) We have already found the symbol e.g. by traversing local_var_alist.
|
|
|
1538 or
|
|
|
1539 b) We know that the symbol will not be found in the current buffer's
|
|
|
1540 list of local variables.
|
|
|
1541 In the former case, find_it_p is 1 and symbol_cons is the element from
|
|
|
1542 local_var_alist. In the latter case, find_it_p is 0 and symbol_cons
|
|
|
1543 is the symbol.
|
|
|
1544
|
|
|
1545 This function is called from set_buffer_internal which does both of these
|
|
|
1546 things. */
|
|
|
1547
|
|
|
1548 Lisp_Object
|
|
|
1549 find_symbol_value_quickly (Lisp_Object symbol_cons, int find_it_p)
|
|
|
1550 {
|
|
|
1551 /* WARNING: This function can be called when current_buffer is 0
|
|
|
1552 and Vselected_console is Qnil, early in initialization. */
|
|
380
|
1553 struct console *con;
|
|
82
|
1554 Lisp_Object sym = find_it_p ? XCAR (symbol_cons) : symbol_cons;
|
|
173
|
1555
|
|
82
|
1556 CHECK_SYMBOL (sym);
|
|
|
1557 if (CONSOLEP (Vselected_console))
|
|
380
|
1558 con = XCONSOLE (Vselected_console);
|
|
82
|
1559 else
|
|
|
1560 {
|
|
|
1561 /* This can also get called while we're preparing to shutdown.
|
|
|
1562 #### What should really happen in that case? Should we
|
|
|
1563 actually fix things so we can't get here in that case? */
|
|
|
1564 assert (!initialized || preparing_for_armageddon);
|
|
380
|
1565 con = 0;
|
|
82
|
1566 }
|
|
|
1567
|
|
380
|
1568 return find_symbol_value_1 (sym, current_buffer, con, 1,
|
|
82
|
1569 find_it_p ? symbol_cons : Qnil,
|
|
|
1570 find_it_p);
|
|
0
|
1571 }
|
|
|
1572
|
|
20
|
1573 DEFUN ("symbol-value", Fsymbol_value, 1, 1, 0, /*
|
|
0
|
1574 Return SYMBOL's value. Error if that is void.
|
|
20
|
1575 */
|
|
380
|
1576 (symbol))
|
|
0
|
1577 {
|
|
380
|
1578 Lisp_Object val = find_symbol_value (symbol);
|
|
0
|
1579
|
|
|
1580 if (UNBOUNDP (val))
|
|
380
|
1581 return Fsignal (Qvoid_variable, list1 (symbol));
|
|
0
|
1582 else
|
|
|
1583 return val;
|
|
|
1584 }
|
|
|
1585
|
|
20
|
1586 DEFUN ("set", Fset, 2, 2, 0, /*
|
|
0
|
1587 Set SYMBOL's value to NEWVAL, and return NEWVAL.
|
|
20
|
1588 */
|
|
380
|
1589 (symbol, newval))
|
|
0
|
1590 {
|
|
|
1591 REGISTER Lisp_Object valcontents;
|
|
412
|
1592 struct Lisp_Symbol *sym;
|
|
0
|
1593 /* remember, we're called by Fmakunbound() as well */
|
|
|
1594
|
|
380
|
1595 CHECK_SYMBOL (symbol);
|
|
0
|
1596
|
|
|
1597 retry:
|
|
380
|
1598 sym = XSYMBOL (symbol);
|
|
|
1599 valcontents = sym->value;
|
|
|
1600
|
|
|
1601 if (EQ (symbol, Qnil) ||
|
|
|
1602 EQ (symbol, Qt) ||
|
|
|
1603 SYMBOL_IS_KEYWORD (symbol))
|
|
|
1604 reject_constant_symbols (symbol, newval, 0,
|
|
195
|
1605 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
380
|
1606
|
|
|
1607 if (!SYMBOL_VALUE_MAGIC_P (valcontents) || UNBOUNDP (valcontents))
|
|
195
|
1608 {
|
|
380
|
1609 sym->value = newval;
|
|
195
|
1610 return newval;
|
|
|
1611 }
|
|
|
1612
|
|
380
|
1613 reject_constant_symbols (symbol, newval, 0,
|
|
|
1614 UNBOUNDP (newval) ? Qmakunbound : Qset);
|
|
|
1615
|
|
412
|
1616 retry_2:
|
|
|
1617
|
|
380
|
1618 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
0
|
1619 {
|
|
380
|
1620 case SYMVAL_LISP_MAGIC:
|
|
|
1621 {
|
|
412
|
1622 Lisp_Object retval;
|
|
|
1623
|
|
380
|
1624 if (UNBOUNDP (newval))
|
|
412
|
1625 retval = maybe_call_magic_handler (symbol, Qmakunbound, 0);
|
|
380
|
1626 else
|
|
412
|
1627 retval = maybe_call_magic_handler (symbol, Qset, 1, newval);
|
|
|
1628 if (!UNBOUNDP (retval))
|
|
|
1629 return newval;
|
|
|
1630 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1631 /* semi-change-o */
|
|
|
1632 goto retry_2;
|
|
380
|
1633 }
|
|
|
1634
|
|
|
1635 case SYMVAL_VARALIAS:
|
|
|
1636 symbol = follow_varalias_pointers (symbol,
|
|
|
1637 UNBOUNDP (newval)
|
|
|
1638 ? Qmakunbound : Qset);
|
|
|
1639 /* presto change-o! */
|
|
|
1640 goto retry;
|
|
|
1641
|
|
|
1642 case SYMVAL_FIXNUM_FORWARD:
|
|
|
1643 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
1644 case SYMVAL_OBJECT_FORWARD:
|
|
|
1645 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
|
1646 case SYMVAL_DEFAULT_CONSOLE_FORWARD:
|
|
|
1647 if (UNBOUNDP (newval))
|
|
|
1648 signal_error (Qerror,
|
|
|
1649 list2 (build_string ("Cannot makunbound"), symbol));
|
|
|
1650 break;
|
|
|
1651
|
|
|
1652 /* case SYMVAL_UNBOUND_MARKER: break; */
|
|
|
1653
|
|
|
1654 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1655 {
|
|
412
|
1656 CONST struct symbol_value_forward *fwd
|
|
380
|
1657 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1658 int mask = XINT (*((Lisp_Object *)
|
|
|
1659 symbol_value_forward_forward (fwd)));
|
|
|
1660 if (mask > 0)
|
|
|
1661 /* Setting this variable makes it buffer-local */
|
|
|
1662 current_buffer->local_var_flags |= mask;
|
|
|
1663 break;
|
|
|
1664 }
|
|
|
1665
|
|
|
1666 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1667 {
|
|
412
|
1668 CONST struct symbol_value_forward *fwd
|
|
380
|
1669 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1670 int mask = XINT (*((Lisp_Object *)
|
|
|
1671 symbol_value_forward_forward (fwd)));
|
|
|
1672 if (mask > 0)
|
|
|
1673 /* Setting this variable makes it console-local */
|
|
|
1674 XCONSOLE (Vselected_console)->local_var_flags |= mask;
|
|
|
1675 break;
|
|
|
1676 }
|
|
|
1677
|
|
|
1678 case SYMVAL_BUFFER_LOCAL:
|
|
|
1679 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1680 {
|
|
|
1681 /* If we want to examine or set the value and
|
|
|
1682 CURRENT-BUFFER is current, we just examine or set
|
|
|
1683 CURRENT-VALUE. If CURRENT-BUFFER is not current, we
|
|
|
1684 store the current CURRENT-VALUE value into
|
|
|
1685 CURRENT-ALIST- ELEMENT, then find the appropriate alist
|
|
|
1686 element for the buffer now current and set up
|
|
|
1687 CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE out
|
|
|
1688 of that element, and store into CURRENT-BUFFER.
|
|
|
1689
|
|
|
1690 If we are setting the variable and the current buffer does
|
|
|
1691 not have an alist entry for this variable, an alist entry is
|
|
|
1692 created.
|
|
|
1693
|
|
|
1694 Note that CURRENT-VALUE can be a forwarding pointer.
|
|
|
1695 Each time it is examined or set, forwarding must be
|
|
|
1696 done. */
|
|
|
1697 struct symbol_value_buffer_local *bfwd
|
|
|
1698 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1699 int some_buffer_local_p =
|
|
|
1700 (bfwd->magic.type == SYMVAL_SOME_BUFFER_LOCAL);
|
|
|
1701 /* What value are we caching right now? */
|
|
|
1702 Lisp_Object aelt = bfwd->current_alist_element;
|
|
|
1703
|
|
|
1704 if (!NILP (bfwd->current_buffer) &&
|
|
|
1705 current_buffer == XBUFFER (bfwd->current_buffer)
|
|
|
1706 && ((some_buffer_local_p)
|
|
|
1707 ? 1 /* doesn't automatically become local */
|
|
|
1708 : !NILP (aelt) /* already local */
|
|
|
1709 ))
|
|
0
|
1710 {
|
|
380
|
1711 /* Cache is valid */
|
|
|
1712 valcontents = bfwd->current_value;
|
|
|
1713 }
|
|
|
1714 else
|
|
|
1715 {
|
|
|
1716 /* If the current buffer is not the buffer whose binding is
|
|
|
1717 currently cached, or if it's a SYMVAL_BUFFER_LOCAL and
|
|
|
1718 we're looking at the default value, the cache is invalid; we
|
|
|
1719 need to write it out, and find the new CURRENT-ALIST-ELEMENT
|
|
|
1720 */
|
|
|
1721
|
|
|
1722 /* Write out the cached value for the old buffer; copy it
|
|
|
1723 back to its alist element. This works if the current
|
|
|
1724 buffer only sees the default value, too. */
|
|
|
1725 write_out_buffer_local_cache (symbol, bfwd);
|
|
|
1726
|
|
|
1727 /* Find the new value for CURRENT-ALIST-ELEMENT. */
|
|
|
1728 aelt = buffer_local_alist_element (current_buffer, symbol, bfwd);
|
|
|
1729 if (NILP (aelt))
|
|
0
|
1730 {
|
|
380
|
1731 /* This buffer is still seeing the default value. */
|
|
|
1732 if (!some_buffer_local_p)
|
|
|
1733 {
|
|
|
1734 /* If it's a SYMVAL_BUFFER_LOCAL, give this buffer a
|
|
|
1735 new assoc for a local value and set
|
|
|
1736 CURRENT-ALIST-ELEMENT to point to that. */
|
|
|
1737 aelt =
|
|
|
1738 do_symval_forwarding (bfwd->current_value,
|
|
|
1739 current_buffer,
|
|
|
1740 XCONSOLE (Vselected_console));
|
|
|
1741 aelt = Fcons (symbol, aelt);
|
|
|
1742 current_buffer->local_var_alist
|
|
|
1743 = Fcons (aelt, current_buffer->local_var_alist);
|
|
|
1744 }
|
|
|
1745 else
|
|
0
|
1746 {
|
|
380
|
1747 /* If the variable is a SYMVAL_SOME_BUFFER_LOCAL,
|
|
|
1748 we're currently seeing the default value. */
|
|
|
1749 ;
|
|
0
|
1750 }
|
|
|
1751 }
|
|
380
|
1752 /* Cache the new buffer's assoc in CURRENT-ALIST-ELEMENT. */
|
|
|
1753 bfwd->current_alist_element = aelt;
|
|
|
1754 /* Set BUFFER, now that CURRENT-ALIST-ELEMENT is accurate. */
|
|
|
1755 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
1756 valcontents = bfwd->current_value;
|
|
0
|
1757 }
|
|
380
|
1758 break;
|
|
|
1759 }
|
|
|
1760 default:
|
|
|
1761 abort ();
|
|
0
|
1762 }
|
|
380
|
1763 store_symval_forwarding (symbol, valcontents, newval);
|
|
0
|
1764
|
|
173
|
1765 return newval;
|
|
0
|
1766 }
|
|
|
1767
|
|
|
1768
|
|
|
1769 /* Access or set a buffer-local symbol's default value. */
|
|
|
1770
|
|
|
1771 /* Return the default value of SYM, but don't check for voidness.
|
|
|
1772 Return Qunbound if it is void. */
|
|
|
1773
|
|
|
1774 static Lisp_Object
|
|
|
1775 default_value (Lisp_Object sym)
|
|
|
1776 {
|
|
|
1777 Lisp_Object valcontents;
|
|
|
1778
|
|
|
1779 CHECK_SYMBOL (sym);
|
|
|
1780
|
|
|
1781 retry:
|
|
|
1782 valcontents = XSYMBOL (sym)->value;
|
|
|
1783
|
|
|
1784 retry_2:
|
|
|
1785 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
1786 return valcontents;
|
|
|
1787
|
|
0
|
1788 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1789 {
|
|
|
1790 case SYMVAL_LISP_MAGIC:
|
|
|
1791 /* #### kludge */
|
|
|
1792 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1793 /* semi-change-o */
|
|
|
1794 goto retry_2;
|
|
|
1795
|
|
|
1796 case SYMVAL_VARALIAS:
|
|
|
1797 sym = follow_varalias_pointers (sym, Qt /* #### kludge */);
|
|
|
1798 /* presto change-o! */
|
|
|
1799 goto retry;
|
|
|
1800
|
|
|
1801 case SYMVAL_UNBOUND_MARKER:
|
|
|
1802 return valcontents;
|
|
|
1803
|
|
|
1804 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
1805 {
|
|
412
|
1806 CONST struct symbol_value_forward *fwd
|
|
0
|
1807 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1808 return (*((Lisp_Object *)((char *) XBUFFER (Vbuffer_defaults)
|
|
|
1809 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1810 - (char *)&buffer_local_flags))));
|
|
|
1811 }
|
|
|
1812
|
|
|
1813 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
1814 {
|
|
412
|
1815 CONST struct symbol_value_forward *fwd
|
|
0
|
1816 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
1817 return (*((Lisp_Object *)((char *) XCONSOLE (Vconsole_defaults)
|
|
|
1818 + ((char *)symbol_value_forward_forward (fwd)
|
|
|
1819 - (char *)&console_local_flags))));
|
|
|
1820 }
|
|
|
1821
|
|
|
1822 case SYMVAL_BUFFER_LOCAL:
|
|
|
1823 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1824 {
|
|
173
|
1825 struct symbol_value_buffer_local *bfwd =
|
|
0
|
1826 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1827
|
|
|
1828 /* Handle user-created local variables. */
|
|
|
1829 /* If var is set up for a buffer that lacks a local value for it,
|
|
|
1830 the current value is nominally the default value.
|
|
|
1831 But the current value slot may be more up to date, since
|
|
|
1832 ordinary setq stores just that slot. So use that. */
|
|
|
1833 if (NILP (bfwd->current_alist_element))
|
|
173
|
1834 return do_symval_forwarding (bfwd->current_value, current_buffer,
|
|
|
1835 XCONSOLE (Vselected_console));
|
|
0
|
1836 else
|
|
173
|
1837 return bfwd->default_value;
|
|
0
|
1838 }
|
|
|
1839 default:
|
|
|
1840 /* For other variables, get the current value. */
|
|
173
|
1841 return do_symval_forwarding (valcontents, current_buffer,
|
|
|
1842 XCONSOLE (Vselected_console));
|
|
0
|
1843 }
|
|
173
|
1844
|
|
380
|
1845 RETURN_NOT_REACHED (Qnil) /* suppress compiler warning */
|
|
0
|
1846 }
|
|
|
1847
|
|
20
|
1848 DEFUN ("default-boundp", Fdefault_boundp, 1, 1, 0, /*
|
|
272
|
1849 Return t if SYMBOL has a non-void default value.
|
|
0
|
1850 This is the value that is seen in buffers that do not have their own values
|
|
|
1851 for this variable.
|
|
20
|
1852 */
|
|
380
|
1853 (symbol))
|
|
0
|
1854 {
|
|
380
|
1855 return UNBOUNDP (default_value (symbol)) ? Qnil : Qt;
|
|
0
|
1856 }
|
|
|
1857
|
|
20
|
1858 DEFUN ("default-value", Fdefault_value, 1, 1, 0, /*
|
|
0
|
1859 Return SYMBOL's default value.
|
|
|
1860 This is the value that is seen in buffers that do not have their own values
|
|
|
1861 for this variable. The default value is meaningful for variables with
|
|
|
1862 local bindings in certain buffers.
|
|
20
|
1863 */
|
|
380
|
1864 (symbol))
|
|
0
|
1865 {
|
|
380
|
1866 Lisp_Object value = default_value (symbol);
|
|
|
1867
|
|
|
1868 return UNBOUNDP (value) ? Fsignal (Qvoid_variable, list1 (symbol)) : value;
|
|
0
|
1869 }
|
|
|
1870
|
|
20
|
1871 DEFUN ("set-default", Fset_default, 2, 2, 0, /*
|
|
0
|
1872 Set SYMBOL's default value to VAL. SYMBOL and VAL are evaluated.
|
|
|
1873 The default value is seen in buffers that do not have their own values
|
|
|
1874 for this variable.
|
|
20
|
1875 */
|
|
380
|
1876 (symbol, value))
|
|
0
|
1877 {
|
|
|
1878 Lisp_Object valcontents;
|
|
|
1879
|
|
380
|
1880 CHECK_SYMBOL (symbol);
|
|
0
|
1881
|
|
|
1882 retry:
|
|
380
|
1883 valcontents = XSYMBOL (symbol)->value;
|
|
0
|
1884
|
|
|
1885 retry_2:
|
|
|
1886 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
380
|
1887 return Fset (symbol, value);
|
|
0
|
1888
|
|
|
1889 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1890 {
|
|
|
1891 case SYMVAL_LISP_MAGIC:
|
|
380
|
1892 RETURN_IF_NOT_UNBOUND (maybe_call_magic_handler (symbol, Qset_default, 1,
|
|
0
|
1893 value));
|
|
|
1894 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
1895 /* semi-change-o */
|
|
|
1896 goto retry_2;
|
|
173
|
1897
|
|
0
|
1898 case SYMVAL_VARALIAS:
|
|
380
|
1899 symbol = follow_varalias_pointers (symbol, Qset_default);
|
|
0
|
1900 /* presto change-o! */
|
|
|
1901 goto retry;
|
|
|
1902
|
|
|
1903 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
380
|
1904 set_default_buffer_slot_variable (symbol, value);
|
|
173
|
1905 return value;
|
|
0
|
1906
|
|
|
1907 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
380
|
1908 set_default_console_slot_variable (symbol, value);
|
|
173
|
1909 return value;
|
|
0
|
1910
|
|
|
1911 case SYMVAL_BUFFER_LOCAL:
|
|
|
1912 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
1913 {
|
|
|
1914 /* Store new value into the DEFAULT-VALUE slot */
|
|
|
1915 struct symbol_value_buffer_local *bfwd
|
|
|
1916 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
1917
|
|
|
1918 bfwd->default_value = value;
|
|
|
1919 /* If current-buffer doesn't shadow default_value,
|
|
|
1920 * we must set the CURRENT-VALUE slot too */
|
|
|
1921 if (NILP (bfwd->current_alist_element))
|
|
380
|
1922 store_symval_forwarding (symbol, bfwd->current_value, value);
|
|
173
|
1923 return value;
|
|
0
|
1924 }
|
|
|
1925
|
|
|
1926 default:
|
|
380
|
1927 return Fset (symbol, value);
|
|
0
|
1928 }
|
|
|
1929 }
|
|
|
1930
|
|
380
|
1931 DEFUN ("setq-default", Fsetq_default, 0, UNEVALLED, 0, /*
|
|
|
1932 Set the default value of variable SYMBOL to VALUE.
|
|
|
1933 SYMBOL, the variable name, is literal (not evaluated);
|
|
0
|
1934 VALUE is an expression and it is evaluated.
|
|
|
1935 The default value of a variable is seen in buffers
|
|
|
1936 that do not have their own values for the variable.
|
|
|
1937
|
|
|
1938 More generally, you can use multiple variables and values, as in
|
|
380
|
1939 (setq-default SYMBOL VALUE SYMBOL VALUE...)
|
|
|
1940 This sets each SYMBOL's default value to the corresponding VALUE.
|
|
|
1941 The VALUE for the Nth SYMBOL can refer to the new default values
|
|
|
1942 of previous SYMBOLs.
|
|
20
|
1943 */
|
|
|
1944 (args))
|
|
0
|
1945 {
|
|
|
1946 /* This function can GC */
|
|
380
|
1947 Lisp_Object symbol, tail, val = Qnil;
|
|
|
1948 int nargs;
|
|
0
|
1949 struct gcpro gcpro1;
|
|
|
1950
|
|
380
|
1951 GET_LIST_LENGTH (args, nargs);
|
|
|
1952
|
|
|
1953 if (nargs & 1) /* Odd number of arguments? */
|
|
|
1954 Fsignal (Qwrong_number_of_arguments,
|
|
|
1955 list2 (Qsetq_default, make_int (nargs)));
|
|
|
1956
|
|
|
1957 GCPRO1 (val);
|
|
|
1958
|
|
|
1959 PROPERTY_LIST_LOOP (tail, symbol, val, args)
|
|
0
|
1960 {
|
|
380
|
1961 val = Feval (val);
|
|
|
1962 Fset_default (symbol, val);
|
|
0
|
1963 }
|
|
|
1964
|
|
|
1965 UNGCPRO;
|
|
|
1966 return val;
|
|
|
1967 }
|
|
|
1968
|
|
|
1969 /* Lisp functions for creating and removing buffer-local variables. */
|
|
|
1970
|
|
20
|
1971 DEFUN ("make-variable-buffer-local", Fmake_variable_buffer_local, 1, 1,
|
|
|
1972 "vMake Variable Buffer Local: ", /*
|
|
0
|
1973 Make VARIABLE have a separate value for each buffer.
|
|
|
1974 At any time, the value for the current buffer is in effect.
|
|
|
1975 There is also a default value which is seen in any buffer which has not yet
|
|
|
1976 set its own value.
|
|
|
1977 Using `set' or `setq' to set the variable causes it to have a separate value
|
|
|
1978 for the current buffer if it was previously using the default value.
|
|
|
1979 The function `default-value' gets the default value and `set-default'
|
|
|
1980 sets it.
|
|
20
|
1981 */
|
|
|
1982 (variable))
|
|
0
|
1983 {
|
|
|
1984 Lisp_Object valcontents;
|
|
|
1985
|
|
|
1986 CHECK_SYMBOL (variable);
|
|
|
1987
|
|
|
1988 retry:
|
|
|
1989 verify_ok_for_buffer_local (variable, Qmake_variable_buffer_local);
|
|
|
1990
|
|
|
1991 valcontents = XSYMBOL (variable)->value;
|
|
|
1992
|
|
|
1993 retry_2:
|
|
|
1994 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
1995 {
|
|
|
1996 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
1997 {
|
|
|
1998 case SYMVAL_LISP_MAGIC:
|
|
|
1999 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2000 (variable, Qmake_variable_buffer_local, 0)))
|
|
|
2001 return variable;
|
|
|
2002 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2003 /* semi-change-o */
|
|
|
2004 goto retry_2;
|
|
|
2005
|
|
|
2006 case SYMVAL_VARALIAS:
|
|
|
2007 variable = follow_varalias_pointers (variable,
|
|
|
2008 Qmake_variable_buffer_local);
|
|
|
2009 /* presto change-o! */
|
|
|
2010 goto retry;
|
|
|
2011
|
|
|
2012 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2013 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2014 case SYMVAL_OBJECT_FORWARD:
|
|
|
2015 case SYMVAL_UNBOUND_MARKER:
|
|
|
2016 break;
|
|
|
2017
|
|
|
2018 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2019 case SYMVAL_BUFFER_LOCAL:
|
|
|
2020 /* Already per-each-buffer */
|
|
173
|
2021 return variable;
|
|
0
|
2022
|
|
|
2023 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2024 /* Transmogrify */
|
|
|
2025 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->magic.type =
|
|
|
2026 SYMVAL_BUFFER_LOCAL;
|
|
173
|
2027 return variable;
|
|
0
|
2028
|
|
|
2029 default:
|
|
|
2030 abort ();
|
|
|
2031 }
|
|
|
2032 }
|
|
173
|
2033
|
|
0
|
2034 {
|
|
|
2035 struct symbol_value_buffer_local *bfwd
|
|
185
|
2036 = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
398
|
2037 &lrecord_symbol_value_buffer_local);
|
|
272
|
2038 Lisp_Object foo;
|
|
0
|
2039 bfwd->magic.type = SYMVAL_BUFFER_LOCAL;
|
|
|
2040
|
|
|
2041 bfwd->default_value = find_symbol_value (variable);
|
|
|
2042 bfwd->current_value = valcontents;
|
|
|
2043 bfwd->current_alist_element = Qnil;
|
|
|
2044 bfwd->current_buffer = Fcurrent_buffer ();
|
|
|
2045 XSETSYMBOL_VALUE_MAGIC (foo, bfwd);
|
|
|
2046 *value_slot_past_magic (variable) = foo;
|
|
|
2047 #if 1 /* #### Yuck! FSFmacs bug-compatibility*/
|
|
|
2048 /* This sets the default-value of any make-variable-buffer-local to nil.
|
|
|
2049 That just sucks. User can just use setq-default to effect that,
|
|
|
2050 but there's no way to do makunbound-default to undo this lossage. */
|
|
|
2051 if (UNBOUNDP (valcontents))
|
|
|
2052 bfwd->default_value = Qnil;
|
|
|
2053 #endif
|
|
|
2054 #if 0 /* #### Yuck! */
|
|
|
2055 /* This sets the value to nil in this buffer.
|
|
|
2056 User could use (setq variable nil) to do this.
|
|
|
2057 It isn't as egregious to do this automatically
|
|
|
2058 as it is to do so to the default-value, but it's
|
|
|
2059 still really dubious. */
|
|
|
2060 if (UNBOUNDP (valcontents))
|
|
|
2061 Fset (variable, Qnil);
|
|
|
2062 #endif
|
|
272
|
2063 return variable;
|
|
0
|
2064 }
|
|
|
2065 }
|
|
|
2066
|
|
272
|
2067 DEFUN ("make-local-variable", Fmake_local_variable, 1, 1,
|
|
|
2068 "vMake Local Variable: ", /*
|
|
0
|
2069 Make VARIABLE have a separate value in the current buffer.
|
|
|
2070 Other buffers will continue to share a common default value.
|
|
|
2071 \(The buffer-local value of VARIABLE starts out as the same value
|
|
|
2072 VARIABLE previously had. If VARIABLE was void, it remains void.)
|
|
|
2073 See also `make-variable-buffer-local'.
|
|
|
2074
|
|
|
2075 If the variable is already arranged to become local when set,
|
|
|
2076 this function causes a local value to exist for this buffer,
|
|
|
2077 just as setting the variable would do.
|
|
|
2078
|
|
|
2079 Do not use `make-local-variable' to make a hook variable buffer-local.
|
|
|
2080 Use `make-local-hook' instead.
|
|
20
|
2081 */
|
|
|
2082 (variable))
|
|
0
|
2083 {
|
|
|
2084 Lisp_Object valcontents;
|
|
|
2085 struct symbol_value_buffer_local *bfwd;
|
|
|
2086
|
|
|
2087 CHECK_SYMBOL (variable);
|
|
|
2088
|
|
|
2089 retry:
|
|
|
2090 verify_ok_for_buffer_local (variable, Qmake_local_variable);
|
|
|
2091
|
|
|
2092 valcontents = XSYMBOL (variable)->value;
|
|
|
2093
|
|
|
2094 retry_2:
|
|
|
2095 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2096 {
|
|
|
2097 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2098 {
|
|
|
2099 case SYMVAL_LISP_MAGIC:
|
|
|
2100 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2101 (variable, Qmake_local_variable, 0)))
|
|
|
2102 return variable;
|
|
|
2103 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2104 /* semi-change-o */
|
|
|
2105 goto retry_2;
|
|
|
2106
|
|
|
2107 case SYMVAL_VARALIAS:
|
|
|
2108 variable = follow_varalias_pointers (variable, Qmake_local_variable);
|
|
|
2109 /* presto change-o! */
|
|
|
2110 goto retry;
|
|
|
2111
|
|
|
2112 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2113 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2114 case SYMVAL_OBJECT_FORWARD:
|
|
|
2115 case SYMVAL_UNBOUND_MARKER:
|
|
|
2116 break;
|
|
|
2117
|
|
|
2118 case SYMVAL_BUFFER_LOCAL:
|
|
|
2119 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2120 {
|
|
|
2121 /* Make sure the symbol has a local value in this particular
|
|
|
2122 buffer, by setting it to the same value it already has. */
|
|
|
2123 Fset (variable, find_symbol_value (variable));
|
|
173
|
2124 return variable;
|
|
0
|
2125 }
|
|
|
2126
|
|
|
2127 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2128 {
|
|
|
2129 if (!NILP (buffer_local_alist_element (current_buffer,
|
|
|
2130 variable,
|
|
|
2131 (XSYMBOL_VALUE_BUFFER_LOCAL
|
|
|
2132 (valcontents)))))
|
|
|
2133 goto already_local_to_current_buffer;
|
|
|
2134 else
|
|
|
2135 goto already_local_to_some_other_buffer;
|
|
|
2136 }
|
|
|
2137
|
|
|
2138 default:
|
|
|
2139 abort ();
|
|
|
2140 }
|
|
|
2141 }
|
|
|
2142
|
|
|
2143 /* Make sure variable is set up to hold per-buffer values */
|
|
185
|
2144 bfwd = alloc_lcrecord_type (struct symbol_value_buffer_local,
|
|
398
|
2145 &lrecord_symbol_value_buffer_local);
|
|
0
|
2146 bfwd->magic.type = SYMVAL_SOME_BUFFER_LOCAL;
|
|
|
2147
|
|
|
2148 bfwd->current_buffer = Qnil;
|
|
|
2149 bfwd->current_alist_element = Qnil;
|
|
|
2150 bfwd->current_value = valcontents;
|
|
|
2151 /* passing 0 is OK because this should never be a
|
|
|
2152 SYMVAL_CURRENT_BUFFER_FORWARD or SYMVAL_SELECTED_CONSOLE_FORWARD
|
|
|
2153 variable. */
|
|
|
2154 bfwd->default_value = do_symval_forwarding (valcontents, 0, 0);
|
|
|
2155
|
|
|
2156 #if 0
|
|
|
2157 if (UNBOUNDP (bfwd->default_value))
|
|
|
2158 bfwd->default_value = Qnil; /* Yuck! */
|
|
|
2159 #endif
|
|
|
2160
|
|
|
2161 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
2162 *value_slot_past_magic (variable) = valcontents;
|
|
|
2163
|
|
|
2164 already_local_to_some_other_buffer:
|
|
|
2165
|
|
|
2166 /* Make sure this buffer has its own value of variable */
|
|
|
2167 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2168
|
|
|
2169 if (UNBOUNDP (bfwd->default_value))
|
|
|
2170 {
|
|
|
2171 /* If default value is unbound, set local value to nil. */
|
|
|
2172 XSETBUFFER (bfwd->current_buffer, current_buffer);
|
|
|
2173 bfwd->current_alist_element = Fcons (variable, Qnil);
|
|
|
2174 current_buffer->local_var_alist =
|
|
|
2175 Fcons (bfwd->current_alist_element, current_buffer->local_var_alist);
|
|
|
2176 store_symval_forwarding (variable, bfwd->current_value, Qnil);
|
|
173
|
2177 return variable;
|
|
0
|
2178 }
|
|
|
2179
|
|
|
2180 current_buffer->local_var_alist
|
|
|
2181 = Fcons (Fcons (variable, bfwd->default_value),
|
|
|
2182 current_buffer->local_var_alist);
|
|
|
2183
|
|
|
2184 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2185 force it to look once again for this buffer's value */
|
|
|
2186 if (!NILP (bfwd->current_buffer) &&
|
|
|
2187 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2188 bfwd->current_buffer = Qnil;
|
|
|
2189
|
|
|
2190 already_local_to_current_buffer:
|
|
|
2191
|
|
|
2192 /* If the symbol forwards into a C variable, then swap in the
|
|
|
2193 variable for this buffer immediately. If C code modifies the
|
|
|
2194 variable before we swap in, then that new value will clobber the
|
|
|
2195 default value the next time we swap. */
|
|
|
2196 bfwd = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2197 if (SYMBOL_VALUE_MAGIC_P (bfwd->current_value))
|
|
|
2198 {
|
|
|
2199 switch (XSYMBOL_VALUE_MAGIC_TYPE (bfwd->current_value))
|
|
|
2200 {
|
|
|
2201 case SYMVAL_FIXNUM_FORWARD:
|
|
|
2202 case SYMVAL_BOOLEAN_FORWARD:
|
|
|
2203 case SYMVAL_OBJECT_FORWARD:
|
|
|
2204 case SYMVAL_DEFAULT_BUFFER_FORWARD:
|
|
82
|
2205 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
0
|
2206 break;
|
|
|
2207
|
|
|
2208 case SYMVAL_UNBOUND_MARKER:
|
|
|
2209 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2210 break;
|
|
|
2211
|
|
|
2212 default:
|
|
|
2213 abort ();
|
|
|
2214 }
|
|
|
2215 }
|
|
|
2216
|
|
173
|
2217 return variable;
|
|
0
|
2218 }
|
|
|
2219
|
|
272
|
2220 DEFUN ("kill-local-variable", Fkill_local_variable, 1, 1,
|
|
|
2221 "vKill Local Variable: ", /*
|
|
0
|
2222 Make VARIABLE no longer have a separate value in the current buffer.
|
|
|
2223 From now on the default value will apply in this buffer.
|
|
20
|
2224 */
|
|
|
2225 (variable))
|
|
0
|
2226 {
|
|
|
2227 Lisp_Object valcontents;
|
|
|
2228
|
|
|
2229 CHECK_SYMBOL (variable);
|
|
|
2230
|
|
|
2231 retry:
|
|
|
2232 valcontents = XSYMBOL (variable)->value;
|
|
|
2233
|
|
|
2234 retry_2:
|
|
|
2235 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
2236 return variable;
|
|
0
|
2237
|
|
|
2238 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2239 {
|
|
|
2240 case SYMVAL_LISP_MAGIC:
|
|
|
2241 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2242 (variable, Qkill_local_variable, 0)))
|
|
|
2243 return variable;
|
|
|
2244 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2245 /* semi-change-o */
|
|
|
2246 goto retry_2;
|
|
|
2247
|
|
|
2248 case SYMVAL_VARALIAS:
|
|
|
2249 variable = follow_varalias_pointers (variable, Qkill_local_variable);
|
|
|
2250 /* presto change-o! */
|
|
|
2251 goto retry;
|
|
|
2252
|
|
|
2253 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2254 {
|
|
412
|
2255 CONST struct symbol_value_forward *fwd
|
|
0
|
2256 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
2257 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
2258 - (char *) &buffer_local_flags);
|
|
|
2259 int mask =
|
|
|
2260 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2261
|
|
|
2262 if (mask > 0)
|
|
|
2263 {
|
|
|
2264 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2265 Lisp_Object in_object, int flags) =
|
|
|
2266 symbol_value_forward_magicfun (fwd);
|
|
|
2267 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2268 (offset + (char *) XBUFFER (Vbuffer_defaults));
|
|
|
2269 if (magicfun)
|
|
|
2270 (magicfun) (variable, &oldval, make_buffer (current_buffer), 0);
|
|
|
2271 *(Lisp_Object *) (offset + (char *) current_buffer)
|
|
|
2272 = oldval;
|
|
|
2273 current_buffer->local_var_flags &= ~mask;
|
|
|
2274 }
|
|
173
|
2275 return variable;
|
|
0
|
2276 }
|
|
|
2277
|
|
|
2278 case SYMVAL_BUFFER_LOCAL:
|
|
|
2279 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2280 {
|
|
|
2281 /* Get rid of this buffer's alist element, if any */
|
|
|
2282 struct symbol_value_buffer_local *bfwd
|
|
|
2283 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2284 Lisp_Object alist = current_buffer->local_var_alist;
|
|
|
2285 Lisp_Object alist_element
|
|
|
2286 = buffer_local_alist_element (current_buffer, variable, bfwd);
|
|
|
2287
|
|
|
2288 if (!NILP (alist_element))
|
|
|
2289 current_buffer->local_var_alist = Fdelq (alist_element, alist);
|
|
|
2290
|
|
|
2291 /* Make sure symbol does not think it is set up for this buffer;
|
|
|
2292 force it to look once again for this buffer's value */
|
|
|
2293 if (!NILP (bfwd->current_buffer) &&
|
|
|
2294 current_buffer == XBUFFER (bfwd->current_buffer))
|
|
|
2295 bfwd->current_buffer = Qnil;
|
|
|
2296
|
|
|
2297 /* We just changed the value in the current_buffer. If this
|
|
|
2298 variable forwards to a C variable, we need to change the
|
|
|
2299 value of the C variable. set_up_buffer_local_cache()
|
|
|
2300 will do this. It doesn't hurt to do it always,
|
|
|
2301 so just go ahead and do that. */
|
|
82
|
2302 set_up_buffer_local_cache (variable, bfwd, current_buffer, Qnil, 1);
|
|
0
|
2303 }
|
|
173
|
2304 return variable;
|
|
0
|
2305
|
|
|
2306 default:
|
|
173
|
2307 return variable;
|
|
0
|
2308 }
|
|
|
2309 RETURN_NOT_REACHED(Qnil) /* suppress compiler warning */
|
|
|
2310 }
|
|
|
2311
|
|
|
2312
|
|
272
|
2313 DEFUN ("kill-console-local-variable", Fkill_console_local_variable, 1, 1,
|
|
|
2314 "vKill Console Local Variable: ", /*
|
|
0
|
2315 Make VARIABLE no longer have a separate value in the selected console.
|
|
|
2316 From now on the default value will apply in this console.
|
|
20
|
2317 */
|
|
|
2318 (variable))
|
|
0
|
2319 {
|
|
|
2320 Lisp_Object valcontents;
|
|
|
2321
|
|
|
2322 CHECK_SYMBOL (variable);
|
|
|
2323
|
|
|
2324 retry:
|
|
|
2325 valcontents = XSYMBOL (variable)->value;
|
|
|
2326
|
|
|
2327 retry_2:
|
|
|
2328 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
173
|
2329 return variable;
|
|
0
|
2330
|
|
|
2331 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2332 {
|
|
|
2333 case SYMVAL_LISP_MAGIC:
|
|
|
2334 if (!UNBOUNDP (maybe_call_magic_handler
|
|
|
2335 (variable, Qkill_console_local_variable, 0)))
|
|
|
2336 return variable;
|
|
|
2337 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2338 /* semi-change-o */
|
|
|
2339 goto retry_2;
|
|
|
2340
|
|
|
2341 case SYMVAL_VARALIAS:
|
|
|
2342 variable = follow_varalias_pointers (variable,
|
|
|
2343 Qkill_console_local_variable);
|
|
|
2344 /* presto change-o! */
|
|
|
2345 goto retry;
|
|
|
2346
|
|
|
2347 case SYMVAL_SELECTED_CONSOLE_FORWARD:
|
|
|
2348 {
|
|
412
|
2349 CONST struct symbol_value_forward *fwd
|
|
0
|
2350 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
173
|
2351 int offset = ((char *) symbol_value_forward_forward (fwd)
|
|
0
|
2352 - (char *) &console_local_flags);
|
|
|
2353 int mask =
|
|
|
2354 XINT (*((Lisp_Object *) symbol_value_forward_forward (fwd)));
|
|
|
2355
|
|
|
2356 if (mask > 0)
|
|
|
2357 {
|
|
|
2358 int (*magicfun) (Lisp_Object sym, Lisp_Object *val,
|
|
|
2359 Lisp_Object in_object, int flags) =
|
|
|
2360 symbol_value_forward_magicfun (fwd);
|
|
|
2361 Lisp_Object oldval = * (Lisp_Object *)
|
|
|
2362 (offset + (char *) XCONSOLE (Vconsole_defaults));
|
|
|
2363 if (magicfun)
|
|
380
|
2364 magicfun (variable, &oldval, Vselected_console, 0);
|
|
0
|
2365 *(Lisp_Object *) (offset + (char *) XCONSOLE (Vselected_console))
|
|
|
2366 = oldval;
|
|
|
2367 XCONSOLE (Vselected_console)->local_var_flags &= ~mask;
|
|
|
2368 }
|
|
173
|
2369 return variable;
|
|
0
|
2370 }
|
|
|
2371
|
|
|
2372 default:
|
|
173
|
2373 return variable;
|
|
0
|
2374 }
|
|
|
2375 }
|
|
|
2376
|
|
|
2377 /* Used by specbind to determine what effects it might have. Returns:
|
|
|
2378 * 0 if symbol isn't buffer-local, and wouldn't be after it is set
|
|
|
2379 * <0 if symbol isn't presently buffer-local, but set would make it so
|
|
|
2380 * >0 if symbol is presently buffer-local
|
|
|
2381 */
|
|
|
2382 int
|
|
|
2383 symbol_value_buffer_local_info (Lisp_Object symbol, struct buffer *buffer)
|
|
|
2384 {
|
|
|
2385 Lisp_Object valcontents;
|
|
|
2386
|
|
|
2387 retry:
|
|
|
2388 valcontents = XSYMBOL (symbol)->value;
|
|
|
2389
|
|
|
2390 retry_2:
|
|
|
2391 if (SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2392 {
|
|
|
2393 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
|
2394 {
|
|
|
2395 case SYMVAL_LISP_MAGIC:
|
|
|
2396 /* #### kludge */
|
|
|
2397 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2398 /* semi-change-o */
|
|
|
2399 goto retry_2;
|
|
|
2400
|
|
|
2401 case SYMVAL_VARALIAS:
|
|
|
2402 symbol = follow_varalias_pointers (symbol, Qt /* #### kludge */);
|
|
|
2403 /* presto change-o! */
|
|
|
2404 goto retry;
|
|
|
2405
|
|
|
2406 case SYMVAL_CURRENT_BUFFER_FORWARD:
|
|
|
2407 {
|
|
412
|
2408 CONST struct symbol_value_forward *fwd
|
|
0
|
2409 = XSYMBOL_VALUE_FORWARD (valcontents);
|
|
|
2410 int mask = XINT (*((Lisp_Object *)
|
|
|
2411 symbol_value_forward_forward (fwd)));
|
|
|
2412 if ((mask <= 0) || (buffer && (buffer->local_var_flags & mask)))
|
|
|
2413 /* Already buffer-local */
|
|
173
|
2414 return 1;
|
|
0
|
2415 else
|
|
|
2416 /* Would be buffer-local after set */
|
|
173
|
2417 return -1;
|
|
0
|
2418 }
|
|
|
2419 case SYMVAL_BUFFER_LOCAL:
|
|
|
2420 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2421 {
|
|
|
2422 struct symbol_value_buffer_local *bfwd
|
|
|
2423 = XSYMBOL_VALUE_BUFFER_LOCAL (valcontents);
|
|
|
2424 if (buffer
|
|
|
2425 && !NILP (buffer_local_alist_element (buffer, symbol, bfwd)))
|
|
173
|
2426 return 1;
|
|
0
|
2427 else
|
|
173
|
2428 /* Automatically becomes local when set */
|
|
|
2429 return bfwd->magic.type == SYMVAL_BUFFER_LOCAL ? -1 : 0;
|
|
0
|
2430 }
|
|
|
2431 default:
|
|
173
|
2432 return 0;
|
|
0
|
2433 }
|
|
|
2434 }
|
|
173
|
2435 return 0;
|
|
0
|
2436 }
|
|
|
2437
|
|
|
2438
|
|
20
|
2439 DEFUN ("symbol-value-in-buffer", Fsymbol_value_in_buffer, 2, 3, 0, /*
|
|
0
|
2440 Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound.
|
|
20
|
2441 */
|
|
|
2442 (symbol, buffer, unbound_value))
|
|
0
|
2443 {
|
|
|
2444 Lisp_Object value;
|
|
|
2445 CHECK_SYMBOL (symbol);
|
|
|
2446 CHECK_BUFFER (buffer);
|
|
|
2447 value = symbol_value_in_buffer (symbol, buffer);
|
|
380
|
2448 return UNBOUNDP (value) ? unbound_value : value;
|
|
0
|
2449 }
|
|
|
2450
|
|
20
|
2451 DEFUN ("symbol-value-in-console", Fsymbol_value_in_console, 2, 3, 0, /*
|
|
0
|
2452 Return the value of SYMBOL in CONSOLE, or UNBOUND-VALUE if it is unbound.
|
|
20
|
2453 */
|
|
|
2454 (symbol, console, unbound_value))
|
|
0
|
2455 {
|
|
|
2456 Lisp_Object value;
|
|
|
2457 CHECK_SYMBOL (symbol);
|
|
|
2458 CHECK_CONSOLE (console);
|
|
|
2459 value = symbol_value_in_console (symbol, console);
|
|
380
|
2460 return UNBOUNDP (value) ? unbound_value : value;
|
|
0
|
2461 }
|
|
|
2462
|
|
20
|
2463 DEFUN ("built-in-variable-type", Fbuilt_in_variable_type, 1, 1, 0, /*
|
|
380
|
2464 If SYMBOL is a built-in variable, return info about this; else return nil.
|
|
0
|
2465 The returned info will be a symbol, one of
|
|
|
2466
|
|
|
2467 `object' A simple built-in variable.
|
|
|
2468 `const-object' Same, but cannot be set.
|
|
|
2469 `integer' A built-in integer variable.
|
|
|
2470 `const-integer' Same, but cannot be set.
|
|
|
2471 `boolean' A built-in boolean variable.
|
|
|
2472 `const-boolean' Same, but cannot be set.
|
|
|
2473 `const-specifier' Always contains a specifier; e.g. `has-modeline-p'.
|
|
|
2474 `current-buffer' A built-in buffer-local variable.
|
|
|
2475 `const-current-buffer' Same, but cannot be set.
|
|
|
2476 `default-buffer' Forwards to the default value of a built-in
|
|
|
2477 buffer-local variable.
|
|
|
2478 `selected-console' A built-in console-local variable.
|
|
|
2479 `const-selected-console' Same, but cannot be set.
|
|
|
2480 `default-console' Forwards to the default value of a built-in
|
|
|
2481 console-local variable.
|
|
20
|
2482 */
|
|
380
|
2483 (symbol))
|
|
0
|
2484 {
|
|
|
2485 REGISTER Lisp_Object valcontents;
|
|
|
2486
|
|
380
|
2487 CHECK_SYMBOL (symbol);
|
|
0
|
2488
|
|
|
2489 retry:
|
|
380
|
2490 valcontents = XSYMBOL (symbol)->value;
|
|
|
2491
|
|
0
|
2492 retry_2:
|
|
380
|
2493 if (!SYMBOL_VALUE_MAGIC_P (valcontents))
|
|
|
2494 return Qnil;
|
|
|
2495
|
|
|
2496 switch (XSYMBOL_VALUE_MAGIC_TYPE (valcontents))
|
|
0
|
2497 {
|
|
380
|
2498 case SYMVAL_LISP_MAGIC:
|
|
|
2499 valcontents = XSYMBOL_VALUE_LISP_MAGIC (valcontents)->shadowed;
|
|
|
2500 /* semi-change-o */
|
|
|
2501 goto retry_2;
|
|
|
2502
|
|
|
2503 case SYMVAL_VARALIAS:
|
|
|
2504 symbol = follow_varalias_pointers (symbol, Qt);
|
|
|
2505 /* presto change-o! */
|
|
|
2506 goto retry;
|
|
|
2507
|
|
|
2508 case SYMVAL_BUFFER_LOCAL:
|
|
|
2509 case SYMVAL_SOME_BUFFER_LOCAL:
|
|
|
2510 valcontents =
|
|
|
2511 XSYMBOL_VALUE_BUFFER_LOCAL (valcontents)->current_value;
|
|
|
2512 /* semi-change-o */
|
|
|
2513 goto retry_2;
|
|
|
2514
|
|
|
2515 case SYMVAL_FIXNUM_FORWARD: return Qinteger;
|
|
|
2516 case SYMVAL_CONST_FIXNUM_FORWARD: return Qconst_integer;
|
|
|
2517 case SYMVAL_BOOLEAN_FORWARD: return Qboolean;
|
|
|
2518 case SYMVAL_CONST_BOOLEAN_FORWARD: return Qconst_boolean;
|
|
|
2519 case SYMVAL_OBJECT_FORWARD: return Qobject;
|
|
|
2520 case SYMVAL_CONST_OBJECT_FORWARD: return Qconst_object;
|
|
|
2521 case SYMVAL_CONST_SPECIFIER_FORWARD: return Qconst_specifier;
|
|
|
2522 case SYMVAL_DEFAULT_BUFFER_FORWARD: return Qdefault_buffer;
|
|
|
2523 case SYMVAL_CURRENT_BUFFER_FORWARD: return Qcurrent_buffer;
|
|
|
2524 case SYMVAL_CONST_CURRENT_BUFFER_FORWARD: return Qconst_current_buffer;
|
|
|
2525 case SYMVAL_DEFAULT_CONSOLE_FORWARD: return Qdefault_console;
|
|
|
2526 case SYMVAL_SELECTED_CONSOLE_FORWARD: return Qselected_console;
|
|
|
2527 case SYMVAL_CONST_SELECTED_CONSOLE_FORWARD: return Qconst_selected_console;
|
|
|
2528 case SYMVAL_UNBOUND_MARKER: return Qnil;
|
|
|
2529
|
|
|
2530 default:
|
|
|
2531 abort (); return Qnil;
|
|
0
|
2532 }
|
|
|
2533 }
|
|
|
2534
|
|
|
2535
|
|
20
|
2536 DEFUN ("local-variable-p", Flocal_variable_p, 2, 3, 0, /*
|
|
0
|
2537 Return t if SYMBOL's value is local to BUFFER.
|
|
|
2538 If optional third arg AFTER-SET is true, return t if SYMBOL would be
|
|
|
2539 buffer-local after it is set, regardless of whether it is so presently.
|
|
|
2540 A nil value for BUFFER is *not* the same as (current-buffer), but means
|
|
|
2541 "no buffer". Specifically:
|
|
|
2542
|
|
|
2543 -- If BUFFER is nil and AFTER-SET is nil, a return value of t indicates that
|
|
|
2544 the variable is one of the special built-in variables that is always
|
|
|
2545 buffer-local. (This includes `buffer-file-name', `buffer-read-only',
|
|
|
2546 `buffer-undo-list', and others.)
|
|
|
2547
|
|
|
2548 -- If BUFFER is nil and AFTER-SET is t, a return value of t indicates that
|
|
|
2549 the variable has had `make-variable-buffer-local' applied to it.
|
|
20
|
2550 */
|
|
|
2551 (symbol, buffer, after_set))
|
|
0
|
2552 {
|
|
|
2553 int local_info;
|
|
173
|
2554
|
|
0
|
2555 CHECK_SYMBOL (symbol);
|
|
|
2556 if (!NILP (buffer))
|
|
|
2557 {
|
|
|
2558 buffer = get_buffer (buffer, 1);
|
|
|
2559 local_info = symbol_value_buffer_local_info (symbol, XBUFFER (buffer));
|
|
|
2560 }
|
|
|
2561 else
|
|
|
2562 {
|
|
|
2563 local_info = symbol_value_buffer_local_info (symbol, 0);
|
|
|
2564 }
|
|
173
|
2565
|
|
0
|
2566 if (NILP (after_set))
|
|
173
|
2567 return local_info > 0 ? Qt : Qnil;
|
|
0
|
2568 else
|
|
173
|
2569 return local_info != 0 ? Qt : Qnil;
|
|
0
|
2570 }
|
|
|
2571
|
|
|
2572
|
|
173
|
2573 /*
|
|
0
|
2574 I've gone ahead and partially implemented this because it's
|
|
|
2575 super-useful for dealing with the compatibility problems in supporting
|
|
|
2576 the old pointer-shape variables, and preventing people from `setq'ing
|
|
|
2577 the new variables. Any other way of handling this problem is way
|
|
|
2578 ugly, likely to be slow, and generally not something I want to waste
|
|
|
2579 my time worrying about.
|
|
|
2580
|
|
|
2581 The interface and/or function name is sure to change before this
|
|
|
2582 gets into its final form. I currently like the way everything is
|
|
|
2583 set up and it has all the features I want it to have, except for
|
|
|
2584 one: I really want to be able to have multiple nested handlers,
|
|
380
|
2585 to implement an `advice'-like capability. This would allow,
|
|
0
|
2586 for example, a clean way of implementing `debug-if-set' or
|
|
|
2587 `debug-if-referenced' and such.
|
|
|
2588
|
|
|
2589 NOTE NOTE NOTE NOTE NOTE NOTE NOTE:
|
|
|
2590 ************************************************************
|
|
|
2591 **Only** the `set-value', `make-unbound', and `make-local'
|
|
|
2592 handler types are currently implemented. Implementing the
|
|
|
2593 get-value and bound-predicate handlers is somewhat tricky
|
|
|
2594 because there are lots of subfunctions (e.g. find_symbol_value()).
|
|
|
2595 find_symbol_value(), in fact, is called from outside of
|
|
|
2596 this module. You'd have to have it do this:
|
|
|
2597
|
|
|
2598 -- check for a `bound-predicate' handler, call that if so;
|
|
|
2599 if it returns nil, return Qunbound
|
|
|
2600 -- check for a `get-value' handler and call it and return
|
|
|
2601 that value
|
|
|
2602
|
|
|
2603 It gets even trickier when you have to deal with
|
|
|
2604 sub-subfunctions like find_symbol_value_1(), and esp.
|
|
|
2605 when you have to properly handle variable aliases, which
|
|
|
2606 can lead to lots of tricky situations. So I've just
|
|
|
2607 punted on this, since the interface isn't officially
|
|
|
2608 exported and we can get by with just a `set-value'
|
|
|
2609 handler.
|
|
|
2610
|
|
|
2611 Actions in unimplemented handler types will correctly
|
|
|
2612 ignore any handlers, and will not fuck anything up or
|
|
|
2613 go awry.
|
|
|
2614
|
|
|
2615 WARNING WARNING: If you do go and implement another
|
|
|
2616 type of handler, make *sure* to change
|
|
|
2617 would_be_magic_handled() so it knows about this,
|
|
|
2618 or dire things could result.
|
|
|
2619 ************************************************************
|
|
|
2620 NOTE NOTE NOTE NOTE NOTE NOTE NOTE
|
|
|
2621
|
|
173
|
2622 Real documentation is as follows.
|
|
0
|
2623
|
|
|
2624 Set a magic handler for VARIABLE.
|
|
|
2625 This allows you to specify arbitrary behavior that results from
|
|
|
2626 accessing or setting a variable. For example, retrieving the
|
|
|
2627 variable's value might actually retrieve the first element off of
|
|
|
2628 a list stored in another variable, and setting the variable's value
|
|
|
2629 might add an element to the front of that list. (This is how the
|
|
|
2630 obsolete variable `unread-command-event' is implemented.)
|
|
|
2631
|
|
|
2632 In general it is NOT good programming practice to use magic variables
|
|
|
2633 in a new package that you are designing. If you feel the need to
|
|
|
2634 do this, it's almost certainly a sign that you should be using a
|
|
|
2635 function instead of a variable. This facility is provided to allow
|
|
|
2636 a package to support obsolete variables and provide compatibility
|
|
|
2637 with similar packages with different variable names and semantics.
|
|
|
2638 By using magic handlers, you can cleanly provide obsoleteness and
|
|
|
2639 compatibility support and separate this support from the core
|
|
|
2640 routines in a package.
|
|
|
2641
|
|
|
2642 VARIABLE should be a symbol naming the variable for which the
|
|
|
2643 magic behavior is provided. HANDLER-TYPE is a symbol specifying
|
|
|
2644 which behavior is being controlled, and HANDLER is the function
|
|
|
2645 that will be called to control this behavior. HARG is a
|
|
|
2646 value that will be passed to HANDLER but is otherwise
|
|
|
2647 uninterpreted. KEEP-EXISTING specifies what to do with existing
|
|
185
|
2648 handlers of the same type; nil means "erase them all", t means
|
|
|
2649 "keep them but insert at the beginning", the list (t) means
|
|
|
2650 "keep them but insert at the end", a function means "keep
|
|
|
2651 them but insert before the specified function", a list containing
|
|
|
2652 a function means "keep them but insert after the specified
|
|
|
2653 function".
|
|
0
|
2654
|
|
|
2655 You can specify magic behavior for any type of variable at all,
|
|
|
2656 and for any handler types that are unspecified, the standard
|
|
|
2657 behavior applies. This allows you, for example, to use
|
|
|
2658 `defvaralias' in conjunction with this function. (For that
|
|
|
2659 matter, `defvaralias' could be implemented using this function.)
|
|
|
2660
|
|
|
2661 The behaviors that can be specified in HANDLER-TYPE are
|
|
|
2662
|
|
|
2663 get-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2664 This means that one of the functions `symbol-value',
|
|
|
2665 `default-value', `symbol-value-in-buffer', or
|
|
|
2666 `symbol-value-in-console' was called on SYM.
|
|
|
2667
|
|
|
2668 set-value (SYM ARGS FUN HARG HANDLERS)
|
|
|
2669 This means that one of the functions `set' or `set-default'
|
|
|
2670 was called on SYM.
|
|
|
2671
|
|
|
2672 bound-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2673 This means that one of the functions `boundp', `globally-boundp',
|
|
|
2674 or `default-boundp' was called on SYM.
|
|
|
2675
|
|
|
2676 make-unbound (SYM ARGS FUN HARG HANDLERS)
|
|
|
2677 This means that the function `makunbound' was called on SYM.
|
|
|
2678
|
|
|
2679 local-predicate (SYM ARGS FUN HARG HANDLERS)
|
|
|
2680 This means that the function `local-variable-p' was called
|
|
|
2681 on SYM.
|
|
|
2682
|
|
|
2683 make-local (SYM ARGS FUN HARG HANDLERS)
|
|
|
2684 This means that one of the functions `make-local-variable',
|
|
|
2685 `make-variable-buffer-local', `kill-local-variable',
|
|
|
2686 or `kill-console-local-variable' was called on SYM.
|
|
|
2687
|
|
|
2688 The meanings of the arguments are as follows:
|
|
|
2689
|
|
|
2690 SYM is the symbol on which the function was called, and is always
|
|
|
2691 the first argument to the function.
|
|
173
|
2692
|
|
0
|
2693 ARGS are the remaining arguments in the original call (i.e. all
|
|
|
2694 but the first). In the case of `set-value' in particular,
|
|
|
2695 the first element of ARGS is the value to which the variable
|
|
|
2696 is being set. In some cases, ARGS is sanitized from what was
|
|
|
2697 actually given. For example, whenever `nil' is passed to an
|
|
|
2698 argument and it means `current-buffer', the current buffer is
|
|
|
2699 substituted instead.
|
|
173
|
2700
|
|
0
|
2701 FUN is a symbol indicating which function is being called.
|
|
|
2702 For many of the functions, you can determine the corresponding
|
|
|
2703 function of a different class using
|
|
|
2704 `symbol-function-corresponding-function'.
|
|
173
|
2705
|
|
0
|
2706 HARG is the argument that was given in the call
|
|
|
2707 to `set-symbol-value-handler' for SYM and HANDLER-TYPE.
|
|
173
|
2708
|
|
0
|
2709 HANDLERS is a structure containing the remaining handlers
|
|
|
2710 for the variable; to call one of them, use
|
|
|
2711 `chain-to-symbol-value-handler'.
|
|
|
2712
|
|
|
2713 NOTE: You may *not* modify the list in ARGS, and if you want to
|
|
|
2714 keep it around after the handler function exits, you must make
|
|
|
2715 a copy using `copy-sequence'. (Same caveats for HANDLERS also.)
|
|
|
2716 */
|
|
|
2717
|
|
|
2718 static enum lisp_magic_handler
|
|
|
2719 decode_magic_handler_type (Lisp_Object symbol)
|
|
|
2720 {
|
|
173
|
2721 if (EQ (symbol, Qget_value)) return MAGIC_HANDLER_GET_VALUE;
|
|
|
2722 if (EQ (symbol, Qset_value)) return MAGIC_HANDLER_SET_VALUE;
|
|
|
2723 if (EQ (symbol, Qbound_predicate)) return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2724 if (EQ (symbol, Qmake_unbound)) return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2725 if (EQ (symbol, Qlocal_predicate)) return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2726 if (EQ (symbol, Qmake_local)) return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2727
|
|
0
|
2728 signal_simple_error ("Unrecognized symbol value handler type", symbol);
|
|
|
2729 abort ();
|
|
|
2730 return MAGIC_HANDLER_MAX;
|
|
|
2731 }
|
|
|
2732
|
|
|
2733 static enum lisp_magic_handler
|
|
|
2734 handler_type_from_function_symbol (Lisp_Object funsym, int abort_if_not_found)
|
|
|
2735 {
|
|
|
2736 if (EQ (funsym, Qsymbol_value)
|
|
|
2737 || EQ (funsym, Qdefault_value)
|
|
|
2738 || EQ (funsym, Qsymbol_value_in_buffer)
|
|
|
2739 || EQ (funsym, Qsymbol_value_in_console))
|
|
|
2740 return MAGIC_HANDLER_GET_VALUE;
|
|
|
2741
|
|
|
2742 if (EQ (funsym, Qset)
|
|
|
2743 || EQ (funsym, Qset_default))
|
|
|
2744 return MAGIC_HANDLER_SET_VALUE;
|
|
|
2745
|
|
|
2746 if (EQ (funsym, Qboundp)
|
|
|
2747 || EQ (funsym, Qglobally_boundp)
|
|
|
2748 || EQ (funsym, Qdefault_boundp))
|
|
|
2749 return MAGIC_HANDLER_BOUND_PREDICATE;
|
|
|
2750
|
|
|
2751 if (EQ (funsym, Qmakunbound))
|
|
|
2752 return MAGIC_HANDLER_MAKE_UNBOUND;
|
|
|
2753
|
|
|
2754 if (EQ (funsym, Qlocal_variable_p))
|
|
|
2755 return MAGIC_HANDLER_LOCAL_PREDICATE;
|
|
|
2756
|
|
|
2757 if (EQ (funsym, Qmake_variable_buffer_local)
|
|
|
2758 || EQ (funsym, Qmake_local_variable))
|
|
|
2759 return MAGIC_HANDLER_MAKE_LOCAL;
|
|
|
2760
|
|
|
2761 if (abort_if_not_found)
|
|
|
2762 abort ();
|
|
|
2763 signal_simple_error ("Unrecognized symbol-value function", funsym);
|
|
|
2764 return MAGIC_HANDLER_MAX;
|
|
|
2765 }
|
|
|
2766
|
|
|
2767 static int
|
|
|
2768 would_be_magic_handled (Lisp_Object sym, Lisp_Object funsym)
|
|
|
2769 {
|
|
|
2770 /* does not take into account variable aliasing. */
|
|
|
2771 Lisp_Object valcontents = XSYMBOL (sym)->value;
|
|
|
2772 enum lisp_magic_handler slot;
|
|
|
2773
|
|
|
2774 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2775 return 0;
|
|
|
2776 slot = handler_type_from_function_symbol (funsym, 1);
|
|
|
2777 if (slot != MAGIC_HANDLER_SET_VALUE && slot != MAGIC_HANDLER_MAKE_UNBOUND
|
|
|
2778 && slot != MAGIC_HANDLER_MAKE_LOCAL)
|
|
|
2779 /* #### temporary kludge because we haven't implemented
|
|
|
2780 lisp-magic variables completely */
|
|
|
2781 return 0;
|
|
|
2782 return !NILP (XSYMBOL_VALUE_LISP_MAGIC (valcontents)->handler[slot]);
|
|
|
2783 }
|
|
|
2784
|
|
|
2785 static Lisp_Object
|
|
|
2786 fetch_value_maybe_past_magic (Lisp_Object sym,
|
|
|
2787 Lisp_Object follow_past_lisp_magic)
|
|
|
2788 {
|
|
|
2789 Lisp_Object value = XSYMBOL (sym)->value;
|
|
|
2790 if (SYMBOL_VALUE_LISP_MAGIC_P (value)
|
|
|
2791 && (EQ (follow_past_lisp_magic, Qt)
|
|
|
2792 || (!NILP (follow_past_lisp_magic)
|
|
|
2793 && !would_be_magic_handled (sym, follow_past_lisp_magic))))
|
|
|
2794 value = XSYMBOL_VALUE_LISP_MAGIC (value)->shadowed;
|
|
|
2795 return value;
|
|
|
2796 }
|
|
|
2797
|
|
|
2798 static Lisp_Object *
|
|
|
2799 value_slot_past_magic (Lisp_Object sym)
|
|
|
2800 {
|
|
|
2801 Lisp_Object *store_pointer = &XSYMBOL (sym)->value;
|
|
|
2802
|
|
|
2803 if (SYMBOL_VALUE_LISP_MAGIC_P (*store_pointer))
|
|
|
2804 store_pointer = &XSYMBOL_VALUE_LISP_MAGIC (sym)->shadowed;
|
|
|
2805 return store_pointer;
|
|
|
2806 }
|
|
|
2807
|
|
|
2808 static Lisp_Object
|
|
|
2809 maybe_call_magic_handler (Lisp_Object sym, Lisp_Object funsym, int nargs, ...)
|
|
|
2810 {
|
|
|
2811 va_list vargs;
|
|
|
2812 Lisp_Object args[20]; /* should be enough ... */
|
|
|
2813 int i;
|
|
|
2814 enum lisp_magic_handler htype;
|
|
|
2815 Lisp_Object legerdemain;
|
|
|
2816 struct symbol_value_lisp_magic *bfwd;
|
|
|
2817
|
|
412
|
2818 assert (nargs >= 0 && nargs < 20);
|
|
0
|
2819 legerdemain = XSYMBOL (sym)->value;
|
|
|
2820 assert (SYMBOL_VALUE_LISP_MAGIC_P (legerdemain));
|
|
|
2821 bfwd = XSYMBOL_VALUE_LISP_MAGIC (legerdemain);
|
|
|
2822
|
|
|
2823 va_start (vargs, nargs);
|
|
|
2824 for (i = 0; i < nargs; i++)
|
|
|
2825 args[i] = va_arg (vargs, Lisp_Object);
|
|
|
2826 va_end (vargs);
|
|
|
2827
|
|
|
2828 htype = handler_type_from_function_symbol (funsym, 1);
|
|
|
2829 if (NILP (bfwd->handler[htype]))
|
|
|
2830 return Qunbound;
|
|
|
2831 /* #### should be reusing the arglist, not always consing anew.
|
|
|
2832 Repeated handler invocations should not cause repeated consing.
|
|
|
2833 Doesn't matter for now, because this is just a quick implementation
|
|
|
2834 for obsolescence support. */
|
|
|
2835 return call5 (bfwd->handler[htype], sym, Flist (nargs, args), funsym,
|
|
|
2836 bfwd->harg[htype], Qnil);
|
|
|
2837 }
|
|
|
2838
|
|
280
|
2839 DEFUN ("dontusethis-set-symbol-value-handler", Fdontusethis_set_symbol_value_handler,
|
|
|
2840 3, 5, 0, /*
|
|
0
|
2841 Don't you dare use this.
|
|
|
2842 If you do, suffer the wrath of Ben, who is likely to rename
|
|
|
2843 this function (or change the semantics of its arguments) without
|
|
|
2844 pity, thereby invalidating your code.
|
|
20
|
2845 */
|
|
|
2846 (variable, handler_type, handler, harg, keep_existing))
|
|
0
|
2847 {
|
|
|
2848 Lisp_Object valcontents;
|
|
|
2849 struct symbol_value_lisp_magic *bfwd;
|
|
|
2850 enum lisp_magic_handler htype;
|
|
|
2851 int i;
|
|
|
2852
|
|
|
2853 /* #### WARNING, only some handler types are implemented. See above.
|
|
|
2854 Actions of other types will ignore a handler if it's there.
|
|
|
2855
|
|
|
2856 #### Also, `chain-to-symbol-value-handler' and
|
|
|
2857 `symbol-function-corresponding-function' are not implemented. */
|
|
|
2858 CHECK_SYMBOL (variable);
|
|
|
2859 CHECK_SYMBOL (handler_type);
|
|
|
2860 htype = decode_magic_handler_type (handler_type);
|
|
|
2861 valcontents = XSYMBOL (variable)->value;
|
|
|
2862 if (!SYMBOL_VALUE_LISP_MAGIC_P (valcontents))
|
|
|
2863 {
|
|
185
|
2864 bfwd = alloc_lcrecord_type (struct symbol_value_lisp_magic,
|
|
398
|
2865 &lrecord_symbol_value_lisp_magic);
|
|
0
|
2866 bfwd->magic.type = SYMVAL_LISP_MAGIC;
|
|
|
2867 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2868 {
|
|
|
2869 bfwd->handler[i] = Qnil;
|
|
|
2870 bfwd->harg[i] = Qnil;
|
|
|
2871 }
|
|
|
2872 bfwd->shadowed = valcontents;
|
|
|
2873 XSETSYMBOL_VALUE_MAGIC (XSYMBOL (variable)->value, bfwd);
|
|
|
2874 }
|
|
|
2875 else
|
|
|
2876 bfwd = XSYMBOL_VALUE_LISP_MAGIC (valcontents);
|
|
|
2877 bfwd->handler[htype] = handler;
|
|
|
2878 bfwd->harg[htype] = harg;
|
|
|
2879
|
|
|
2880 for (i = 0; i < MAGIC_HANDLER_MAX; i++)
|
|
|
2881 if (!NILP (bfwd->handler[i]))
|
|
|
2882 break;
|
|
|
2883
|
|
|
2884 if (i == MAGIC_HANDLER_MAX)
|
|
|
2885 /* there are no remaining handlers, so remove the structure. */
|
|
|
2886 XSYMBOL (variable)->value = bfwd->shadowed;
|
|
|
2887
|
|
|
2888 return Qnil;
|
|
|
2889 }
|
|
|
2890
|
|
|
2891
|
|
|
2892 /* functions for working with variable aliases. */
|
|
|
2893
|
|
380
|
2894 /* Follow the chain of variable aliases for SYMBOL. Return the
|
|
0
|
2895 resulting symbol, whose value cell is guaranteed not to be a
|
|
|
2896 symbol-value-varalias.
|
|
|
2897
|
|
|
2898 Also maybe follow past symbol-value-lisp-magic -> symbol-value-varalias.
|
|
|
2899 If FUNSYM is t, always follow in such a case. If FUNSYM is nil,
|
|
|
2900 never follow; stop right there. Otherwise FUNSYM should be a
|
|
|
2901 recognized symbol-value function symbol; this means, follow
|
|
|
2902 unless there is a special handler for the named function.
|
|
|
2903
|
|
|
2904 OK, there is at least one reason why it's necessary for
|
|
|
2905 FOLLOW-PAST-LISP-MAGIC to be specified correctly: So that we
|
|
|
2906 can always be sure to catch cyclic variable aliasing. If we never
|
|
|
2907 follow past Lisp magic, then if the following is done:
|
|
|
2908
|
|
|
2909 (defvaralias 'a 'b)
|
|
|
2910 add some magic behavior to a, but not a "get-value" handler
|
|
|
2911 (defvaralias 'b 'a)
|
|
|
2912
|
|
|
2913 then an attempt to retrieve a's or b's value would cause infinite
|
|
|
2914 looping in `symbol-value'.
|
|
|
2915
|
|
|
2916 We (of course) can't always follow past Lisp magic, because then
|
|
|
2917 we make any variable that is lisp-magic -> varalias behave as if
|
|
|
2918 the lisp-magic is not present at all.
|
|
|
2919 */
|
|
|
2920
|
|
|
2921 static Lisp_Object
|
|
380
|
2922 follow_varalias_pointers (Lisp_Object symbol,
|
|
0
|
2923 Lisp_Object follow_past_lisp_magic)
|
|
|
2924 {
|
|
380
|
2925 #define VARALIAS_INDIRECTION_SUSPICION_LENGTH 16
|
|
|
2926 Lisp_Object tortoise, hare, val;
|
|
|
2927 int count;
|
|
0
|
2928
|
|
|
2929 /* quick out just in case */
|
|
380
|
2930 if (!SYMBOL_VALUE_MAGIC_P (XSYMBOL (symbol)->value))
|
|
|
2931 return symbol;
|
|
|
2932
|
|
|
2933 /* Compare implementation of indirect_function(). */
|
|
|
2934 for (hare = tortoise = symbol, count = 0;
|
|
|
2935 val = fetch_value_maybe_past_magic (hare, follow_past_lisp_magic),
|
|
|
2936 SYMBOL_VALUE_VARALIAS_P (val);
|
|
|
2937 hare = symbol_value_varalias_aliasee (XSYMBOL_VALUE_VARALIAS (val)),
|
|
|
2938 count++)
|
|
0
|
2939 {
|
|
380
|
2940 if (count < VARALIAS_INDIRECTION_SUSPICION_LENGTH) continue;
|
|
|
2941
|
|
|
2942 if (count & 1)
|
|
|
2943 tortoise = symbol_value_varalias_aliasee
|
|
|
2944 (XSYMBOL_VALUE_VARALIAS (fetch_value_maybe_past_magic
|
|
|
2945 (tortoise, follow_past_lisp_magic)));
|
|
0
|
2946 if (EQ (hare, tortoise))
|
|
380
|
2947 return Fsignal (Qcyclic_variable_indirection, list1 (symbol));
|
|
0
|
2948 }
|
|
|
2949
|
|
|
2950 return hare;
|
|
|
2951 }
|
|
|
2952
|
|
20
|
2953 DEFUN ("defvaralias", Fdefvaralias, 2, 2, 0, /*
|
|
0
|
2954 Define a variable as an alias for another variable.
|
|
|
2955 Thenceforth, any operations performed on VARIABLE will actually be
|
|
|
2956 performed on ALIAS. Both VARIABLE and ALIAS should be symbols.
|
|
|
2957 If ALIAS is nil, remove any aliases for VARIABLE.
|
|
|
2958 ALIAS can itself be aliased, and the chain of variable aliases
|
|
|
2959 will be followed appropriately.
|
|
|
2960 If VARIABLE already has a value, this value will be shadowed
|
|
|
2961 until the alias is removed, at which point it will be restored.
|
|
|
2962 Currently VARIABLE cannot be a built-in variable, a variable that
|
|
|
2963 has a buffer-local value in any buffer, or the symbols nil or t.
|
|
272
|
2964 \(ALIAS, however, can be any type of variable.)
|
|
20
|
2965 */
|
|
|
2966 (variable, alias))
|
|
0
|
2967 {
|
|
|
2968 struct symbol_value_varalias *bfwd;
|
|
|
2969 Lisp_Object valcontents;
|
|
|
2970
|
|
|
2971 CHECK_SYMBOL (variable);
|
|
|
2972 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
2973
|
|
|
2974 valcontents = XSYMBOL (variable)->value;
|
|
|
2975
|
|
|
2976 if (NILP (alias))
|
|
|
2977 {
|
|
|
2978 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
2979 {
|
|
|
2980 XSYMBOL (variable)->value =
|
|
|
2981 symbol_value_varalias_shadowed
|
|
|
2982 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
2983 }
|
|
|
2984 return Qnil;
|
|
|
2985 }
|
|
173
|
2986
|
|
0
|
2987 CHECK_SYMBOL (alias);
|
|
|
2988 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
2989 {
|
|
|
2990 /* transmogrify */
|
|
|
2991 XSYMBOL_VALUE_VARALIAS (valcontents)->aliasee = alias;
|
|
|
2992 return Qnil;
|
|
|
2993 }
|
|
|
2994
|
|
|
2995 if (SYMBOL_VALUE_MAGIC_P (valcontents)
|
|
|
2996 && !UNBOUNDP (valcontents))
|
|
|
2997 signal_simple_error ("Variable is magic and cannot be aliased", variable);
|
|
|
2998 reject_constant_symbols (variable, Qunbound, 0, Qt);
|
|
|
2999
|
|
185
|
3000 bfwd = alloc_lcrecord_type (struct symbol_value_varalias,
|
|
398
|
3001 &lrecord_symbol_value_varalias);
|
|
0
|
3002 bfwd->magic.type = SYMVAL_VARALIAS;
|
|
|
3003 bfwd->aliasee = alias;
|
|
|
3004 bfwd->shadowed = valcontents;
|
|
173
|
3005
|
|
0
|
3006 XSETSYMBOL_VALUE_MAGIC (valcontents, bfwd);
|
|
|
3007 XSYMBOL (variable)->value = valcontents;
|
|
|
3008 return Qnil;
|
|
|
3009 }
|
|
|
3010
|
|
20
|
3011 DEFUN ("variable-alias", Fvariable_alias, 1, 2, 0, /*
|
|
0
|
3012 If VARIABLE is aliased to another variable, return that variable.
|
|
|
3013 VARIABLE should be a symbol. If VARIABLE is not aliased, return nil.
|
|
|
3014 Variable aliases are created with `defvaralias'. See also
|
|
|
3015 `indirect-variable'.
|
|
20
|
3016 */
|
|
|
3017 (variable, follow_past_lisp_magic))
|
|
0
|
3018 {
|
|
|
3019 Lisp_Object valcontents;
|
|
|
3020
|
|
|
3021 CHECK_SYMBOL (variable);
|
|
|
3022 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3023 {
|
|
|
3024 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
183
|
3025 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
0
|
3026 }
|
|
|
3027
|
|
|
3028 valcontents = fetch_value_maybe_past_magic (variable,
|
|
|
3029 follow_past_lisp_magic);
|
|
|
3030
|
|
|
3031 if (SYMBOL_VALUE_VARALIAS_P (valcontents))
|
|
|
3032 return symbol_value_varalias_aliasee
|
|
|
3033 (XSYMBOL_VALUE_VARALIAS (valcontents));
|
|
|
3034 else
|
|
|
3035 return Qnil;
|
|
|
3036 }
|
|
|
3037
|
|
20
|
3038 DEFUN ("indirect-variable", Findirect_variable, 1, 2, 0, /*
|
|
0
|
3039 Return the variable at the end of OBJECT's variable-alias chain.
|
|
|
3040 If OBJECT is a symbol, follow all variable aliases and return
|
|
|
3041 the final (non-aliased) symbol. Variable aliases are created with
|
|
|
3042 the function `defvaralias'.
|
|
|
3043 If OBJECT is not a symbol, just return it.
|
|
|
3044 Signal a cyclic-variable-indirection error if there is a loop in the
|
|
|
3045 variable chain of symbols.
|
|
20
|
3046 */
|
|
|
3047 (object, follow_past_lisp_magic))
|
|
0
|
3048 {
|
|
|
3049 if (!SYMBOLP (object))
|
|
|
3050 return object;
|
|
|
3051 if (!NILP (follow_past_lisp_magic) && !EQ (follow_past_lisp_magic, Qt))
|
|
|
3052 {
|
|
|
3053 CHECK_SYMBOL (follow_past_lisp_magic);
|
|
183
|
3054 handler_type_from_function_symbol (follow_past_lisp_magic, 0);
|
|
0
|
3055 }
|
|
|
3056 return follow_varalias_pointers (object, follow_past_lisp_magic);
|
|
|
3057 }
|
|
|
3058
|
|
|
3059
|
|
|
3060 /************************************************************************/
|
|
|
3061 /* initialization */
|
|
|
3062 /************************************************************************/
|
|
|
3063
|
|
|
3064 /* A dumped XEmacs image has a lot more than 1511 symbols. Last
|
|
|
3065 estimate was that there were actually around 6300. So let's try
|
|
|
3066 making this bigger and see if we get better hashing behavior. */
|
|
|
3067 #define OBARRAY_SIZE 16411
|
|
|
3068
|
|
|
3069 #ifndef Qzero
|
|
|
3070 Lisp_Object Qzero;
|
|
|
3071 #endif
|
|
207
|
3072 #ifndef Qnull_pointer
|
|
|
3073 Lisp_Object Qnull_pointer;
|
|
|
3074 #endif
|
|
0
|
3075
|
|
|
3076 /* some losing systems can't have static vars at function scope... */
|
|
412
|
3077 static struct symbol_value_magic guts_of_unbound_marker =
|
|
|
3078 { { symbol_value_forward_lheader_initializer, 0, 69},
|
|
|
3079 SYMVAL_UNBOUND_MARKER };
|
|
247
|
3080
|
|
0
|
3081 void
|
|
|
3082 init_symbols_once_early (void)
|
|
|
3083 {
|
|
412
|
3084 #ifndef Qzero
|
|
|
3085 Qzero = make_int (0); /* Only used if Lisp_Object is a union type */
|
|
|
3086 #endif
|
|
|
3087
|
|
|
3088 #ifndef Qnull_pointer
|
|
|
3089 /* C guarantees that Qnull_pointer will be initialized to all 0 bits,
|
|
|
3090 so the following is actually a no-op. */
|
|
|
3091 XSETOBJ (Qnull_pointer, (enum Lisp_Type) 0, 0);
|
|
|
3092 #endif
|
|
398
|
3093
|
|
|
3094 /* Bootstrapping problem: Qnil isn't set when make_string_nocopy is
|
|
0
|
3095 called the first time. */
|
|
412
|
3096 Qnil = Fmake_symbol (make_string_nocopy ((CONST Bufbyte *) "nil", 3));
|
|
0
|
3097 XSYMBOL (Qnil)->name->plist = Qnil;
|
|
|
3098 XSYMBOL (Qnil)->value = Qnil; /* Nihil ex nihil */
|
|
|
3099 XSYMBOL (Qnil)->plist = Qnil;
|
|
173
|
3100
|
|
0
|
3101 Vobarray = make_vector (OBARRAY_SIZE, Qzero);
|
|
|
3102 initial_obarray = Vobarray;
|
|
|
3103 staticpro (&initial_obarray);
|
|
|
3104 /* Intern nil in the obarray */
|
|
|
3105 {
|
|
272
|
3106 int hash = hash_string (string_data (XSYMBOL (Qnil)->name), 3);
|
|
|
3107 XVECTOR_DATA (Vobarray)[hash % OBARRAY_SIZE] = Qnil;
|
|
0
|
3108 }
|
|
173
|
3109
|
|
0
|
3110 {
|
|
|
3111 /* Required to get around a GCC syntax error on certain
|
|
|
3112 architectures */
|
|
412
|
3113 struct symbol_value_magic *tem = &guts_of_unbound_marker;
|
|
173
|
3114
|
|
0
|
3115 XSETSYMBOL_VALUE_MAGIC (Qunbound, tem);
|
|
|
3116 }
|
|
412
|
3117 if ((CONST void *) XPNTR (Qunbound) !=
|
|
|
3118 (CONST void *)&guts_of_unbound_marker)
|
|
|
3119 {
|
|
|
3120 /* This might happen on DATA_SEG_BITS machines. */
|
|
|
3121 /* abort (); */
|
|
|
3122 /* Can't represent a pointer to constant C data using a Lisp_Object.
|
|
|
3123 So heap-allocate it. */
|
|
|
3124 struct symbol_value_magic *urk = xnew (struct symbol_value_magic);
|
|
|
3125 memcpy (urk, &guts_of_unbound_marker, sizeof (*urk));
|
|
|
3126 XSETSYMBOL_VALUE_MAGIC (Qunbound, urk);
|
|
|
3127 }
|
|
173
|
3128
|
|
0
|
3129 XSYMBOL (Qnil)->function = Qunbound;
|
|
173
|
3130
|
|
0
|
3131 defsymbol (&Qt, "t");
|
|
|
3132 XSYMBOL (Qt)->value = Qt; /* Veritas aetera */
|
|
|
3133 Vquit_flag = Qnil;
|
|
|
3134 }
|
|
|
3135
|
|
|
3136 void
|
|
412
|
3137 defsymbol (Lisp_Object *location, CONST char *name)
|
|
0
|
3138 {
|
|
412
|
3139 *location = Fintern (make_string_nocopy ((CONST Bufbyte *) name,
|
|
398
|
3140 strlen (name)),
|
|
0
|
3141 Qnil);
|
|
|
3142 staticpro (location);
|
|
|
3143 }
|
|
|
3144
|
|
|
3145 void
|
|
412
|
3146 defkeyword (Lisp_Object *location, CONST char *name)
|
|
0
|
3147 {
|
|
|
3148 defsymbol (location, name);
|
|
|
3149 Fset (*location, *location);
|
|
|
3150 }
|
|
|
3151
|
|
380
|
3152 #ifdef DEBUG_XEMACS
|
|
|
3153 /* Check that nobody spazzed writing a DEFUN. */
|
|
|
3154 static void
|
|
|
3155 check_sane_subr (Lisp_Subr *subr, Lisp_Object sym)
|
|
0
|
3156 {
|
|
16
|
3157 assert (subr->min_args >= 0);
|
|
|
3158 assert (subr->min_args <= SUBR_MAX_ARGS);
|
|
|
3159
|
|
380
|
3160 if (subr->max_args != MANY &&
|
|
|
3161 subr->max_args != UNEVALLED)
|
|
0
|
3162 {
|
|
16
|
3163 /* Need to fix lisp.h and eval.c if SUBR_MAX_ARGS too small */
|
|
|
3164 assert (subr->max_args <= SUBR_MAX_ARGS);
|
|
|
3165 assert (subr->min_args <= subr->max_args);
|
|
0
|
3166 }
|
|
173
|
3167
|
|
16
|
3168 assert (UNBOUNDP (XSYMBOL (sym)->function));
|
|
380
|
3169 }
|
|
|
3170 #else
|
|
|
3171 #define check_sane_subr(subr, sym) /* nothing */
|
|
|
3172 #endif
|
|
|
3173
|
|
388
|
3174 #ifdef HAVE_SHLIB
|
|
|
3175 /*
|
|
|
3176 * If we are not in a pure undumped Emacs, we need to make a duplicate of
|
|
|
3177 * the subr. This is because the only time this function will be called
|
|
|
3178 * in a running Emacs is when a dynamically loaded module is adding a
|
|
|
3179 * subr, and we need to make sure that the subr is in allocated, Lisp-
|
|
|
3180 * accessible memory. The address assigned to the static subr struct
|
|
|
3181 * in the shared object will be a trampoline address, so we need to create
|
|
|
3182 * a copy here to ensure that a real address is used.
|
|
|
3183 *
|
|
|
3184 * Once we have copied everything across, we re-use the original static
|
|
|
3185 * structure to store a pointer to the newly allocated one. This will be
|
|
|
3186 * used in emodules.c by emodules_doc_subr() to find a pointer to the
|
|
|
3187 * allocated object so that we can set its doc string propperly.
|
|
|
3188 *
|
|
|
3189 * NOTE: We dont actually use the DOC pointer here any more, but we did
|
|
|
3190 * in an earlier implementation of module support. There is no harm in
|
|
|
3191 * setting it here in case we ever need it in future implementations.
|
|
|
3192 * subr->doc will point to the new subr structure that was allocated.
|
|
|
3193 * Code can then get this value from the statis subr structure and use
|
|
|
3194 * it if required.
|
|
|
3195 *
|
|
|
3196 * FIXME: Should newsubr be staticpro()'ed? I dont think so but I need
|
|
|
3197 * a guru to check.
|
|
|
3198 */
|
|
412
|
3199 #define check_module_subr() \
|
|
|
3200 do { \
|
|
|
3201 if (initialized) { \
|
|
|
3202 struct Lisp_Subr *newsubr; \
|
|
|
3203 newsubr = (Lisp_Subr *)xmalloc(sizeof(struct Lisp_Subr)); \
|
|
|
3204 memcpy (newsubr, subr, sizeof(struct Lisp_Subr)); \
|
|
|
3205 subr->doc = (CONST char *)newsubr; \
|
|
|
3206 subr = newsubr; \
|
|
|
3207 } \
|
|
388
|
3208 } while (0)
|
|
|
3209 #else /* ! HAVE_SHLIB */
|
|
|
3210 #define check_module_subr()
|
|
|
3211 #endif
|
|
|
3212
|
|
380
|
3213 void
|
|
|
3214 defsubr (Lisp_Subr *subr)
|
|
|
3215 {
|
|
|
3216 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3217 Lisp_Object fun;
|
|
|
3218
|
|
|
3219 check_sane_subr (subr, sym);
|
|
388
|
3220 check_module_subr ();
|
|
380
|
3221
|
|
|
3222 XSETSUBR (fun, subr);
|
|
|
3223 XSYMBOL (sym)->function = fun;
|
|
|
3224 }
|
|
|
3225
|
|
|
3226 /* Define a lisp macro using a Lisp_Subr. */
|
|
|
3227 void
|
|
|
3228 defsubr_macro (Lisp_Subr *subr)
|
|
|
3229 {
|
|
|
3230 Lisp_Object sym = intern (subr_name (subr));
|
|
|
3231 Lisp_Object fun;
|
|
|
3232
|
|
|
3233 check_sane_subr (subr, sym);
|
|
388
|
3234 check_module_subr();
|
|
380
|
3235
|
|
|
3236 XSETSUBR (fun, subr);
|
|
|
3237 XSYMBOL (sym)->function = Fcons (Qmacro, fun);
|
|
0
|
3238 }
|
|
|
3239
|
|
|
3240 void
|
|
412
|
3241 deferror (Lisp_Object *symbol, CONST char *name, CONST char *messuhhj,
|
|
0
|
3242 Lisp_Object inherits_from)
|
|
|
3243 {
|
|
|
3244 Lisp_Object conds;
|
|
|
3245 defsymbol (symbol, name);
|
|
|
3246
|
|
|
3247 assert (SYMBOLP (inherits_from));
|
|
|
3248 conds = Fget (inherits_from, Qerror_conditions, Qnil);
|
|
412
|
3249 pure_put (*symbol, Qerror_conditions, Fcons (*symbol, conds));
|
|
0
|
3250 /* NOT build_translated_string (). This function is called at load time
|
|
|
3251 and the string needs to get translated at run time. (This happens
|
|
|
3252 in the function (display-error) in cmdloop.el.) */
|
|
412
|
3253 pure_put (*symbol, Qerror_message, build_string (messuhhj));
|
|
0
|
3254 }
|
|
|
3255
|
|
|
3256 void
|
|
|
3257 syms_of_symbols (void)
|
|
|
3258 {
|
|
|
3259 defsymbol (&Qvariable_documentation, "variable-documentation");
|
|
|
3260 defsymbol (&Qvariable_domain, "variable-domain"); /* I18N3 */
|
|
|
3261 defsymbol (&Qad_advice_info, "ad-advice-info");
|
|
|
3262 defsymbol (&Qad_activate, "ad-activate");
|
|
|
3263
|
|
|
3264 defsymbol (&Qget_value, "get-value");
|
|
|
3265 defsymbol (&Qset_value, "set-value");
|
|
|
3266 defsymbol (&Qbound_predicate, "bound-predicate");
|
|
|
3267 defsymbol (&Qmake_unbound, "make-unbound");
|
|
|
3268 defsymbol (&Qlocal_predicate, "local-predicate");
|
|
|
3269 defsymbol (&Qmake_local, "make-local");
|
|
|
3270
|
|
|
3271 defsymbol (&Qboundp, "boundp");
|
|
412
|
3272 defsymbol (&Qfboundp, "fboundp");
|
|
0
|
3273 defsymbol (&Qglobally_boundp, "globally-boundp");
|
|
|
3274 defsymbol (&Qmakunbound, "makunbound");
|
|
|
3275 defsymbol (&Qsymbol_value, "symbol-value");
|
|
|
3276 defsymbol (&Qset, "set");
|
|
380
|
3277 defsymbol (&Qsetq_default, "setq-default");
|
|
0
|
3278 defsymbol (&Qdefault_boundp, "default-boundp");
|
|
|
3279 defsymbol (&Qdefault_value, "default-value");
|
|
|
3280 defsymbol (&Qset_default, "set-default");
|
|
|
3281 defsymbol (&Qmake_variable_buffer_local, "make-variable-buffer-local");
|
|
|
3282 defsymbol (&Qmake_local_variable, "make-local-variable");
|
|
|
3283 defsymbol (&Qkill_local_variable, "kill-local-variable");
|
|
|
3284 defsymbol (&Qkill_console_local_variable, "kill-console-local-variable");
|
|
|
3285 defsymbol (&Qsymbol_value_in_buffer, "symbol-value-in-buffer");
|
|
|
3286 defsymbol (&Qsymbol_value_in_console, "symbol-value-in-console");
|
|
|
3287 defsymbol (&Qlocal_variable_p, "local-variable-p");
|
|
|
3288
|
|
|
3289 defsymbol (&Qconst_integer, "const-integer");
|
|
|
3290 defsymbol (&Qconst_boolean, "const-boolean");
|
|
|
3291 defsymbol (&Qconst_object, "const-object");
|
|
|
3292 defsymbol (&Qconst_specifier, "const-specifier");
|
|
|
3293 defsymbol (&Qdefault_buffer, "default-buffer");
|
|
|
3294 defsymbol (&Qcurrent_buffer, "current-buffer");
|
|
|
3295 defsymbol (&Qconst_current_buffer, "const-current-buffer");
|
|
|
3296 defsymbol (&Qdefault_console, "default-console");
|
|
|
3297 defsymbol (&Qselected_console, "selected-console");
|
|
|
3298 defsymbol (&Qconst_selected_console, "const-selected-console");
|
|
|
3299
|
|
20
|
3300 DEFSUBR (Fintern);
|
|
|
3301 DEFSUBR (Fintern_soft);
|
|
|
3302 DEFSUBR (Funintern);
|
|
|
3303 DEFSUBR (Fmapatoms);
|
|
|
3304 DEFSUBR (Fapropos_internal);
|
|
|
3305
|
|
|
3306 DEFSUBR (Fsymbol_function);
|
|
|
3307 DEFSUBR (Fsymbol_plist);
|
|
|
3308 DEFSUBR (Fsymbol_name);
|
|
|
3309 DEFSUBR (Fmakunbound);
|
|
|
3310 DEFSUBR (Ffmakunbound);
|
|
|
3311 DEFSUBR (Fboundp);
|
|
|
3312 DEFSUBR (Fglobally_boundp);
|
|
|
3313 DEFSUBR (Ffboundp);
|
|
|
3314 DEFSUBR (Ffset);
|
|
|
3315 DEFSUBR (Fdefine_function);
|
|
380
|
3316 Ffset (intern ("defalias"), intern ("define-function"));
|
|
20
|
3317 DEFSUBR (Fsetplist);
|
|
|
3318 DEFSUBR (Fsymbol_value_in_buffer);
|
|
|
3319 DEFSUBR (Fsymbol_value_in_console);
|
|
|
3320 DEFSUBR (Fbuilt_in_variable_type);
|
|
|
3321 DEFSUBR (Fsymbol_value);
|
|
|
3322 DEFSUBR (Fset);
|
|
|
3323 DEFSUBR (Fdefault_boundp);
|
|
|
3324 DEFSUBR (Fdefault_value);
|
|
|
3325 DEFSUBR (Fset_default);
|
|
|
3326 DEFSUBR (Fsetq_default);
|
|
|
3327 DEFSUBR (Fmake_variable_buffer_local);
|
|
|
3328 DEFSUBR (Fmake_local_variable);
|
|
|
3329 DEFSUBR (Fkill_local_variable);
|
|
|
3330 DEFSUBR (Fkill_console_local_variable);
|
|
|
3331 DEFSUBR (Flocal_variable_p);
|
|
|
3332 DEFSUBR (Fdefvaralias);
|
|
|
3333 DEFSUBR (Fvariable_alias);
|
|
|
3334 DEFSUBR (Findirect_variable);
|
|
|
3335 DEFSUBR (Fdontusethis_set_symbol_value_handler);
|
|
0
|
3336 }
|
|
|
3337
|
|
380
|
3338 /* Create and initialize a Lisp variable whose value is forwarded to C data */
|
|
0
|
3339 void
|
|
412
|
3340 defvar_magic (CONST char *symbol_name, CONST struct symbol_value_forward *magic)
|
|
0
|
3341 {
|
|
412
|
3342 Lisp_Object sym, kludge;
|
|
|
3343
|
|
|
3344 /* Check that `magic' points somewhere we can represent as a Lisp pointer */
|
|
|
3345 XSETOBJ (kludge, Lisp_Type_Record, magic);
|
|
|
3346 if ((void *)magic != (void*) XPNTR (kludge))
|
|
|
3347 {
|
|
|
3348 /* This might happen on DATA_SEG_BITS machines. */
|
|
|
3349 /* abort (); */
|
|
|
3350 /* Copy it to somewhere which is representable. */
|
|
|
3351 struct symbol_value_forward *p = xnew (struct symbol_value_forward);
|
|
|
3352 memcpy (p, magic, sizeof *magic);
|
|
|
3353 magic = p;
|
|
|
3354 }
|
|
380
|
3355
|
|
388
|
3356 #if defined(HAVE_SHLIB)
|
|
|
3357 /*
|
|
|
3358 * As with defsubr(), this will only be called in a dumped Emacs when
|
|
|
3359 * we are adding variables from a dynamically loaded module. That means
|
|
|
3360 * we can't use purespace. Take that into account.
|
|
|
3361 */
|
|
|
3362 if (initialized)
|
|
|
3363 sym = Fintern (build_string (symbol_name), Qnil);
|
|
|
3364 else
|
|
|
3365 #endif
|
|
412
|
3366 sym = Fintern (make_string_nocopy ((CONST Bufbyte *) symbol_name,
|
|
398
|
3367 strlen (symbol_name)), Qnil);
|
|
388
|
3368
|
|
380
|
3369 XSETOBJ (XSYMBOL (sym)->value, Lisp_Type_Record, magic);
|
|
0
|
3370 }
|
|
|
3371
|
|
|
3372 void
|
|
|
3373 vars_of_symbols (void)
|
|
|
3374 {
|
|
|
3375 DEFVAR_LISP ("obarray", &Vobarray /*
|
|
|
3376 Symbol table for use by `intern' and `read'.
|
|
|
3377 It is a vector whose length ought to be prime for best results.
|
|
|
3378 The vector's contents don't make sense if examined from Lisp programs;
|
|
|
3379 to find all the symbols in an obarray, use `mapatoms'.
|
|
|
3380 */ );
|
|
|
3381 /* obarray has been initialized long before */
|
|
|
3382 }
|
