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428
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1 /* Definitions of symbol-value forwarding for XEmacs Lisp interpreter.
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2 Copyright (C) 1985, 1986, 1987, 1992, 1993 Free Software Foundation, Inc.
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793
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3 Copyright (C) 2000, 2001, 2002 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* Fsymbol_value checks whether XSYMBOL (sym)->value is one of these,
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25 * and does weird magic stuff if so */
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26
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440
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27 #ifndef INCLUDED_symeval_h_
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28 #define INCLUDED_symeval_h_
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428
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29
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30 enum symbol_value_type
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31 {
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32 /* The following tags use the 'symbol_value_forward' structure
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33 and are strictly for variables DEFVARed on the C level. */
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458
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34 SYMVAL_FIXNUM_FORWARD, /* Forward C "Fixnum", really "EMACS_INT" */
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428
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35 SYMVAL_CONST_FIXNUM_FORWARD, /* Same, but can't be set */
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36 SYMVAL_BOOLEAN_FORWARD, /* Forward C boolean ("int") */
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37 SYMVAL_CONST_BOOLEAN_FORWARD, /* Same, but can't be set */
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38 SYMVAL_OBJECT_FORWARD, /* Forward C Lisp_Object */
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39 SYMVAL_CONST_OBJECT_FORWARD, /* Same, but can't be set */
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40 SYMVAL_CONST_SPECIFIER_FORWARD, /* Same, can't be set, but gives a
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41 different message when attempting to
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42 set that says "use set-specifier" */
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43 SYMVAL_DEFAULT_BUFFER_FORWARD, /* Forward Lisp_Object into Vbuffer_defaults */
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44 SYMVAL_CURRENT_BUFFER_FORWARD, /* Forward Lisp_Object into current_buffer */
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45 SYMVAL_CONST_CURRENT_BUFFER_FORWARD, /* Forward Lisp_Object into
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46 current_buffer, can't be set */
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47 SYMVAL_DEFAULT_CONSOLE_FORWARD, /* Forward Lisp_Object into
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48 Vconsole_defaults */
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49 SYMVAL_SELECTED_CONSOLE_FORWARD, /* Forward Lisp_Object into
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50 Vselected_console */
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51 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD, /* Forward Lisp_Object into
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52 Vselected_console,
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53 can't be set */
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54 SYMVAL_UNBOUND_MARKER, /* Only Qunbound actually has this tag */
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55
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56 /* The following tags use the 'symbol_value_buffer_local' structure */
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57 SYMVAL_BUFFER_LOCAL, /* make-variable-buffer-local */
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58 SYMVAL_SOME_BUFFER_LOCAL, /* make-local-variable */
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59
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60 /* The following tag uses the 'symbol_value_lisp_magic' structure */
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61 SYMVAL_LISP_MAGIC, /* Forward to lisp callbacks */
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62
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63 /* The following tag uses the 'symbol_value_varalias' structure */
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64 SYMVAL_VARALIAS /* defvaralias */
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65
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66 #if 0
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67 /* NYI */
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68 SYMVAL_CONSTANT_SYMBOL, /* Self-evaluating symbol */
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69 /* NYI */
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70 #endif
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71 };
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72
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458
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73 /* Underlying C type used to implement DEFVAR_INT */
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74 typedef EMACS_INT Fixnum;
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75
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428
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76 struct symbol_value_magic
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77 {
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78 struct lcrecord_header lcheader;
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442
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79 void *value;
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428
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80 enum symbol_value_type type;
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81 };
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442
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82 #define SYMBOL_VALUE_MAGIC_P(x) \
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83 (LRECORDP (x) && \
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84 XRECORD_LHEADER (x)->type <= lrecord_type_max_symbol_value_magic)
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428
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85 #define XSYMBOL_VALUE_MAGIC_TYPE(v) \
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86 (((struct symbol_value_magic *) XPNTR (v))->type)
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793
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87 #define wrap_symbol_value_magic(p) wrap_pointer_1 (p)
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428
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88 void print_symbol_value_magic (Lisp_Object, Lisp_Object, int);
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89
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90 /********** The various different symbol-value-magic types ***********/
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91
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92 /* 1. symbol-value-forward */
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93
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94 /* This type of symbol-value-magic is used for variables declared
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95 DEFVAR_LISP, DEFVAR_INT, DEFVAR_BOOL, DEFVAR_BUFFER_LOCAL,
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96 DEFVAR_BUFFER_DEFAULTS, DEFVAR_SPECIFIER, and for Qunbound.
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97
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98 Note that some of these types of variables can be made buffer-local.
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99 Then, the symbol's value field contains a symbol-value-buffer-local,
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100 whose CURRENT-VALUE field then contains a symbol-value-forward.
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101 */
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102
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103 struct symbol_value_forward
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104 {
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105 struct symbol_value_magic magic;
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106
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107 /* `magicfun' is a function controlling the magic behavior of this
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108 forward variable.
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109
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110 SYM is the symbol being operated on (read, set, etc.);
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111
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112 VAL is either the value to set or the value to be returned.
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113
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114 IN_OBJECT is the buffer or console that the value is read in
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115 or set in. A value of Qnil means that the current buffer
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116 and possibly other buffers are being set. (This value will
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117 never be passed for built-in buffer-local or console-local
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118 variables such as `truncate-lines'.) (Currently, a value of
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119 Qnil is always passed for DEFVAR_INT, DEFVAR_LISP, and
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120 DEFVAR_BOOL variables; the code isn't smart enough to figure
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121 out what buffers besides the current buffer are being
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122 affected. Because the magic function is called
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123 before the value is changed, it's not that easy
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124 to determine which buffers are getting changed.
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125 #### If this information is important, let me know
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126 and I will look into providing it.) (Remember also
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127 that the only console-local variables currently existing
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128 are built-in ones, because others can't be created.)
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129
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130 FLAGS gives more information about the operation being performed.
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131
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132 The return value indicates what the magic function actually did.
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133
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134 Currently FLAGS and the return value are not used. This
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135 function is only called when the value of a forward variable
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136 is about to be changed. Note that this can occur explicitly
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137 through a call to `set', `setq', `set-default', or `setq-default',
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138 or implicitly by the current buffer being changed. */
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139 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, Lisp_Object in_object,
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140 int flags);
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141 };
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142 DECLARE_LRECORD (symbol_value_forward, struct symbol_value_forward);
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143 #define XSYMBOL_VALUE_FORWARD(x) \
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144 XRECORD (x, symbol_value_forward, struct symbol_value_forward)
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442
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145 #define symbol_value_forward_forward(m) ((void *)((m)->magic.value))
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428
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146 #define symbol_value_forward_magicfun(m) ((m)->magicfun)
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147
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148 /* 2. symbol-value-buffer-local */
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149
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150 struct symbol_value_buffer_local
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151 {
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152 struct symbol_value_magic magic;
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153 /* Used in a symbol value cell when the symbol's value is per-buffer.
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154
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155 The type of the symbol-value-magic will be either
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156 SYMVAL_BUFFER_LOCAL (i.e. `make-variable-buffer-local' was called)
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157 or SYMVAL_SOME_BUFFER_LOCAL (i.e. `make-local-variable' was called).
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158 The only difference between the two is that when setting the
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159 former kind of variable, an implicit `make-local-variable' is
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160 called.
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161
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162 A buffer-local variable logically has
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163
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164 -- a default value
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165 -- local values in some buffers
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166
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167 The primary place where the local values are stored is in each
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168 buffer's local_var_alist slot.
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169
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170 In the simplest implementation, all that this structure needs to
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171 keep track of is the default value; to retrieve the value in
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172 a buffer, look in that buffer's local_var_alist, and use the
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173 default value if there is no local value. To implement
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174 `make-local-variable' in a buffer, look in the buffer's
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175 local_var_alist, and if no element exists for this symbol,
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176 add one, copying the value from the default value. When setting
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177 the value in a buffer, look in the buffer's local_var_alist, and set
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178 the value in that list if an element exists for this symbol;
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179 otherwise, set the default. (Remember that SYMVAL_BUFFER_LOCAL
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180 variables implicitly call `make-local-variable' first, so when
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181 setting a value, there will always be an entry in the buffer's
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182 local_var_alist to set.)
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183
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184 However, this operation is potentially slow. To speed it up,
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185 we cache the value in one buffer in this structure.
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186
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187 NOTE: This is *not* a write-through cache. I.e. when setting
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188 the value in the buffer that is cached, we *only* change the
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189 cache and don't write the value through to either the buffer's
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190 local_var_alist or the default value. Therefore, when retrieving
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191 a value in a buffer, you must *always* look in the cache to see if
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192 it refers to that buffer.
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193
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194 The cache consists of
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195
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196 -- a buffer, or nil if the cache has not been set up
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197 -- the value in that buffer
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198 -- the element (a cons) from the buffer's local_var_alist, or
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199 nil if there is no local value in the buffer
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200
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201 These slots are called CURRENT-BUFFER, CURRENT-VALUE, and
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202 CURRENT-ALIST-ELEMENT, respectively.
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203
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204 If we want to examine or set the value in BUFFER and CURRENT-BUFFER
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205 equals BUFFER, we just examine or set CURRENT-VALUE. Otherwise,
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206 we store CURRENT-VALUE value into CURRENT-ALIST-ELEMENT (or maybe
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207 into DEFAULT-VALUE), then find the appropriate alist element for
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208 BUFFER and set up CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE
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209 out of that element (or maybe out of DEFAULT-VALUE), and store
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210 BUFFER into CURRENT-BUFFER.
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211
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212 If we are setting the variable and the current buffer does not have
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213 an alist entry for this variable, an alist entry is created.
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214
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215 Note that CURRENT-BUFFER's local_var_alist value for this variable
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216 might be out-of-date (the correct value is stored in CURRENT-VALUE).
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217 Similarly, if CURRENT-BUFFER sees the default value, then
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218 DEFAULT-VALUE might be out-of-date.
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219
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220 Note that CURRENT-VALUE (but not DEFAULT-VALUE) can be a
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221 forwarding pointer. Each time it is examined or set,
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222 forwarding must be done.
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223 */
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224 Lisp_Object default_value;
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225 Lisp_Object current_value;
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226 Lisp_Object current_buffer;
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227 Lisp_Object current_alist_element;
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228 };
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229 DECLARE_LRECORD (symbol_value_buffer_local, struct symbol_value_buffer_local);
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230 #define XSYMBOL_VALUE_BUFFER_LOCAL(x) \
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231 XRECORD (x, symbol_value_buffer_local, struct symbol_value_buffer_local)
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232 #define SYMBOL_VALUE_BUFFER_LOCAL_P(x) RECORDP (x, symbol_value_buffer_local)
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233
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234 /* 3. symbol-value-lisp-magic */
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235
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236 enum lisp_magic_handler
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237 {
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238 MAGIC_HANDLER_GET_VALUE,
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239 MAGIC_HANDLER_SET_VALUE,
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240 MAGIC_HANDLER_BOUND_PREDICATE,
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241 MAGIC_HANDLER_MAKE_UNBOUND,
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242 MAGIC_HANDLER_LOCAL_PREDICATE,
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243 MAGIC_HANDLER_MAKE_LOCAL,
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244 MAGIC_HANDLER_MAX
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245 };
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246
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247 struct symbol_value_lisp_magic
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248 {
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249 struct symbol_value_magic magic;
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250 Lisp_Object handler[MAGIC_HANDLER_MAX];
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251 Lisp_Object harg[MAGIC_HANDLER_MAX];
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252 Lisp_Object shadowed;
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253 };
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254 DECLARE_LRECORD (symbol_value_lisp_magic, struct symbol_value_lisp_magic);
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255 #define XSYMBOL_VALUE_LISP_MAGIC(x) \
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256 XRECORD (x, symbol_value_lisp_magic, struct symbol_value_lisp_magic)
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257 #define SYMBOL_VALUE_LISP_MAGIC_P(x) RECORDP (x, symbol_value_lisp_magic)
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258
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259 /* 4. symbol-value-varalias */
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260
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261 struct symbol_value_varalias
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262 {
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263 struct symbol_value_magic magic;
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264 Lisp_Object aliasee;
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265 Lisp_Object shadowed;
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266 };
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267 DECLARE_LRECORD (symbol_value_varalias, struct symbol_value_varalias);
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268 #define XSYMBOL_VALUE_VARALIAS(x) \
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269 XRECORD (x, symbol_value_varalias, struct symbol_value_varalias)
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270 #define SYMBOL_VALUE_VARALIAS_P(x) RECORDP (x, symbol_value_varalias)
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271 #define symbol_value_varalias_aliasee(m) ((m)->aliasee)
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272 #define symbol_value_varalias_shadowed(m) ((m)->shadowed)
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273
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274 /* To define a Lisp primitive function using a C function `Fname', do this:
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275 DEFUN ("name, Fname, ...); // at top level in foo.c
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276 DEFSUBR (Fname); // in syms_of_foo();
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277 */
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278 void defsubr (Lisp_Subr *);
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279 #define DEFSUBR(Fname) defsubr (&S##Fname)
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280
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281 /* To define a Lisp primitive macro using a C function `Fname', do this:
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282 DEFUN ("name, Fname, ...); // at top level in foo.c
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283 DEFSUBR_MACRO (Fname); // in syms_of_foo();
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284 */
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285 void defsubr_macro (Lisp_Subr *);
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286 #define DEFSUBR_MACRO(Fname) defsubr_macro (&S##Fname)
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287
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442
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288 void defsymbol_massage_name (Lisp_Object *location, const char *name);
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289 void defsymbol_massage_name_nodump (Lisp_Object *location, const char *name);
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290 void defsymbol_massage_multiword_predicate (Lisp_Object *location,
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291 const char *name);
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292 void defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location,
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293 const char *name);
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294 void defsymbol (Lisp_Object *location, const char *name);
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295 void defsymbol_nodump (Lisp_Object *location, const char *name);
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296
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563
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297 /* Defining symbols:
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298
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299 (1) A standard symbol is defined with DEFSYMBOL. That means that
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300 the symbol's print name can be derived from the symbol's variable
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301 name by removing the initial Q and replacing underscores with hyphens.
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302 (2) A keyword symbol is defined with DEFKEYWORD. That means that
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303 the symbol's print name can be derived from the symbol's variable
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304 name by removing the initial Q and replacing underscores with hyphens,
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305 except that the initial underscore, which comes directly after the Q,
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306 is replaced by a colon.
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307 (3) DEFSYMBOL_MULTIWORD_PREDICATE is used for the predicates that are
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308 associated with a particular type of Lisp Object. Because of the
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309 limitations of C macros, they're always given a predicate symbol
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310 whose C name simply appends `p' to the type name, modulo hyphen/
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311 underscore conversion. Properly, however, the Lisp name should have
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312 `-p' if there is more than one word in the type name.
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313 DEFSYMBOL_MULTIWORD_PREDICATE is for these weird symbols -- the
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314 C name as supplied to the macro should end with a `p' with no
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315 underscore before it, and the macro will insert a hyphen there in
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316 the Lisp name.
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317 (4) In case you have some weird symbol where the equivalence between
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318 the C and Lisp names is more complicated (e.g. the Lisp symbol has
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319 non-alphabetic, non-numeric characters in it), you can just call
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320 defsymbol() (the lowercase version) directly.
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321 */
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322
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442
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323 #define DEFSYMBOL(name) defsymbol_massage_name (&name, #name)
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324 #define DEFSYMBOL_NO_DUMP(name) defsymbol_massage_name_nodump (&name, #name)
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325 #define DEFSYMBOL_MULTIWORD_PREDICATE(name) \
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326 defsymbol_massage_multiword_predicate (&name, #name)
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327 #define DEFSYMBOL_MULTIWORD_PREDICATE_NO_DUMP(name) \
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328 defsymbol_massage_multiword_predicate_nodump (&name, #name)
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428
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329
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442
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330 void defkeyword (Lisp_Object *location, const char *name);
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331 void defkeyword_massage_name (Lisp_Object *location, const char *name);
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332 #define DEFKEYWORD(name) defkeyword_massage_name (&name, #name)
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428
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333
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442
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334 void deferror (Lisp_Object *symbol, const char *name,
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335 const char *message, Lisp_Object inherits_from);
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336 void deferror_massage_name (Lisp_Object *symbol, const char *name,
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337 const char *message, Lisp_Object inherits_from);
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338 void deferror_massage_name_and_message (Lisp_Object *symbol, const char *name,
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339 Lisp_Object inherits_from);
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340 #define DEFERROR(name, message, inherits_from) \
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341 deferror_massage_name (&name, #name, message, inherits_from)
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342 /* In this case, the error message is the same as the name, modulo some
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343 prettifying */
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344 #define DEFERROR_STANDARD(name, inherits_from) \
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345 deferror_massage_name_and_message (&name, #name, inherits_from)
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428
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346
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347 /* Macros we use to define forwarded Lisp variables.
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348 These are used in the syms_of_FILENAME functions. */
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349
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771
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350 void defvar_magic (const char *symbol_name,
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351 const struct symbol_value_forward *magic);
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428
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352
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771
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353 #define DEFVAR_SYMVAL_FWD(lname, c_location, forward_type, magicfun) \
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354 do \
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355 { \
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356 static const struct symbol_value_forward I_hate_C = \
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357 { /* struct symbol_value_forward */ \
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358 { /* struct symbol_value_magic */ \
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359 { /* struct lcrecord_header */ \
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360 { /* struct lrecord_header */ \
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361 lrecord_type_symbol_value_forward, /* lrecord_type_index */ \
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362 1, /* mark bit */ \
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363 1, /* c_readonly bit */ \
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364 1 /* lisp_readonly bit */ \
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365 }, \
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366 0, /* next */ \
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367 0, /* uid */ \
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368 0 /* free */ \
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369 }, \
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370 c_location, \
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371 forward_type \
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372 }, \
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373 magicfun \
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374 }; \
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375 defvar_magic ((lname), &I_hate_C); \
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428
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376 } while (0)
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377
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771
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378 #define DEFVAR_SYMVAL_FWD_INT(lname, c_location, forward_type, magicfun) \
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379 do \
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380 { \
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381 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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382 dump_add_opaque_int (c_location); \
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458
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383 } while (0)
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384
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771
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385 #define DEFVAR_SYMVAL_FWD_FIXNUM(lname, c_location, forward_type, magicfun) \
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386 do \
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387 { \
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388 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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389 dump_add_opaque_fixnum (c_location); \
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442
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390 } while (0)
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391
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771
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392 #define DEFVAR_SYMVAL_FWD_OBJECT(lname, c_location, forward_type, magicfun) \
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393 do \
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394 { \
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395 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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396 { \
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397 Lisp_Object *DSF_location = c_location; /* Type check */ \
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398 staticpro (DSF_location); \
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399 if (EQ (*DSF_location, Qnull_pointer)) *DSF_location = Qnil; \
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400 } \
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428
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401 } while (0)
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402
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403 #define DEFVAR_LISP(lname, c_location) \
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404 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, 0)
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405 #define DEFVAR_CONST_LISP(lname, c_location) \
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406 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_OBJECT_FORWARD, 0)
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407 #define DEFVAR_SPECIFIER(lname, c_location) \
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408 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_SPECIFIER_FORWARD, 0)
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409 #define DEFVAR_INT(lname, c_location) \
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458
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410 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_FIXNUM_FORWARD, 0)
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428
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411 #define DEFVAR_CONST_INT(lname, c_location) \
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458
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412 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_CONST_FIXNUM_FORWARD, 0)
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428
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413 #define DEFVAR_BOOL(lname, c_location) \
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442
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414 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, 0)
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428
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415 #define DEFVAR_CONST_BOOL(lname, c_location) \
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442
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416 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_CONST_BOOLEAN_FORWARD, 0)
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428
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417 #define DEFVAR_LISP_MAGIC(lname, c_location, magicfun) \
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440
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418 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, magicfun)
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428
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419 #define DEFVAR_INT_MAGIC(lname, c_location, magicfun) \
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458
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420 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_FIXNUM_FORWARD, magicfun)
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428
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421 #define DEFVAR_BOOL_MAGIC(lname, c_location, magicfun) \
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442
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422 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, magicfun)
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428
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423
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446
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424 void flush_all_buffer_local_cache (void);
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425
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440
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426 #endif /* INCLUDED_symeval_h_ */
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