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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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442
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3 Copyright (C) 2000 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: 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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34 SYMVAL_FIXNUM_FORWARD, /* Forward C "int" */
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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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73 struct symbol_value_magic
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74 {
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75 struct lcrecord_header lcheader;
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442
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76 void *value;
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428
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77 enum symbol_value_type type;
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78 };
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442
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79 #define SYMBOL_VALUE_MAGIC_P(x) \
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80 (LRECORDP (x) && \
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81 XRECORD_LHEADER (x)->type <= lrecord_type_max_symbol_value_magic)
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428
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82 #define XSYMBOL_VALUE_MAGIC_TYPE(v) \
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83 (((struct symbol_value_magic *) XPNTR (v))->type)
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442
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84 #define XSETSYMBOL_VALUE_MAGIC(s, p) XSETOBJ (s, p)
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428
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85 void print_symbol_value_magic (Lisp_Object, Lisp_Object, int);
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86
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87 /********** The various different symbol-value-magic types ***********/
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88
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89 /* 1. symbol-value-forward */
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90
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91 /* This type of symbol-value-magic is used for variables declared
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92 DEFVAR_LISP, DEFVAR_INT, DEFVAR_BOOL, DEFVAR_BUFFER_LOCAL,
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93 DEFVAR_BUFFER_DEFAULTS, DEFVAR_SPECIFIER, and for Qunbound.
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94
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95 Note that some of these types of variables can be made buffer-local.
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96 Then, the symbol's value field contains a symbol-value-buffer-local,
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97 whose CURRENT-VALUE field then contains a symbol-value-forward.
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98 */
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99
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100 struct symbol_value_forward
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101 {
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102 struct symbol_value_magic magic;
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103
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104 /* `magicfun' is a function controlling the magic behavior of this
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105 forward variable.
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106
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107 SYM is the symbol being operated on (read, set, etc.);
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108
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109 VAL is either the value to set or the value to be returned.
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110
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111 IN_OBJECT is the buffer or console that the value is read in
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112 or set in. A value of Qnil means that the current buffer
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113 and possibly other buffers are being set. (This value will
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114 never be passed for built-in buffer-local or console-local
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115 variables such as `truncate-lines'.) (Currently, a value of
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116 Qnil is always passed for DEFVAR_INT, DEFVAR_LISP, and
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117 DEFVAR_BOOL variables; the code isn't smart enough to figure
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118 out what buffers besides the current buffer are being
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119 affected. Because the magic function is called
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120 before the value is changed, it's not that easy
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121 to determine which buffers are getting changed.
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122 #### If this information is important, let me know
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123 and I will look into providing it.) (Remember also
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124 that the only console-local variables currently existing
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125 are built-in ones, because others can't be created.)
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126
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127 FLAGS gives more information about the operation being performed.
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128
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129 The return value indicates what the magic function actually did.
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130
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131 Currently FLAGS and the return value are not used. This
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132 function is only called when the value of a forward variable
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133 is about to be changed. Note that this can occur explicitly
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134 through a call to `set', `setq', `set-default', or `setq-default',
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135 or implicitly by the current buffer being changed. */
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136 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, Lisp_Object in_object,
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137 int flags);
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138 };
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139 DECLARE_LRECORD (symbol_value_forward, struct symbol_value_forward);
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140 #define XSYMBOL_VALUE_FORWARD(x) \
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141 XRECORD (x, symbol_value_forward, struct symbol_value_forward)
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442
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142 #define symbol_value_forward_forward(m) ((void *)((m)->magic.value))
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428
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143 #define symbol_value_forward_magicfun(m) ((m)->magicfun)
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144
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145 /* 2. symbol-value-buffer-local */
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146
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147 struct symbol_value_buffer_local
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148 {
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149 struct symbol_value_magic magic;
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150 /* Used in a symbol value cell when the symbol's value is per-buffer.
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151
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152 The type of the symbol-value-magic will be either
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153 SYMVAL_BUFFER_LOCAL (i.e. `make-variable-buffer-local' was called)
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154 or SYMVAL_SOME_BUFFER_LOCAL (i.e. `make-local-variable' was called).
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155 The only difference between the two is that when setting the
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156 former kind of variable, an implicit `make-local-variable' is
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157 called.
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158
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159 A buffer-local variable logically has
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160
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161 -- a default value
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162 -- local values in some buffers
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163
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164 The primary place where the local values are stored is in each
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165 buffer's local_var_alist slot.
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166
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167 In the simplest implementation, all that this structure needs to
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168 keep track of is the default value; to retrieve the value in
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169 a buffer, look in that buffer's local_var_alist, and use the
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170 default value if there is no local value. To implement
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171 `make-local-variable' in a buffer, look in the buffer's
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172 local_var_alist, and if no element exists for this symbol,
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173 add one, copying the value from the default value. When setting
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174 the value in a buffer, look in the buffer's local_var_alist, and set
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175 the value in that list if an element exists for this symbol;
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176 otherwise, set the default. (Remember that SYMVAL_BUFFER_LOCAL
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177 variables implicitly call `make-local-variable' first, so when
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178 setting a value, there will always be an entry in the buffer's
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179 local_var_alist to set.)
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180
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181 However, this operation is potentially slow. To speed it up,
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182 we cache the value in one buffer in this structure.
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183
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184 NOTE: This is *not* a write-through cache. I.e. when setting
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185 the value in the buffer that is cached, we *only* change the
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186 cache and don't write the value through to either the buffer's
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187 local_var_alist or the default value. Therefore, when retrieving
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188 a value in a buffer, you must *always* look in the cache to see if
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189 it refers to that buffer.
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190
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191 The cache consists of
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192
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193 -- a buffer, or nil if the cache has not been set up
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194 -- the value in that buffer
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195 -- the element (a cons) from the buffer's local_var_alist, or
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196 nil if there is no local value in the buffer
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197
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198 These slots are called CURRENT-BUFFER, CURRENT-VALUE, and
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199 CURRENT-ALIST-ELEMENT, respectively.
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200
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201 If we want to examine or set the value in BUFFER and CURRENT-BUFFER
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202 equals BUFFER, we just examine or set CURRENT-VALUE. Otherwise,
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203 we store CURRENT-VALUE value into CURRENT-ALIST-ELEMENT (or maybe
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204 into DEFAULT-VALUE), then find the appropriate alist element for
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205 BUFFER and set up CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE
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206 out of that element (or maybe out of DEFAULT-VALUE), and store
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207 BUFFER into CURRENT-BUFFER.
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208
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209 If we are setting the variable and the current buffer does not have
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210 an alist entry for this variable, an alist entry is created.
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211
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212 Note that CURRENT-BUFFER's local_var_alist value for this variable
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213 might be out-of-date (the correct value is stored in CURRENT-VALUE).
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214 Similarly, if CURRENT-BUFFER sees the default value, then
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215 DEFAULT-VALUE might be out-of-date.
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216
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217 Note that CURRENT-VALUE (but not DEFAULT-VALUE) can be a
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218 forwarding pointer. Each time it is examined or set,
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219 forwarding must be done.
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220 */
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221 Lisp_Object default_value;
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222 Lisp_Object current_value;
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223 Lisp_Object current_buffer;
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224 Lisp_Object current_alist_element;
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225 };
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226 DECLARE_LRECORD (symbol_value_buffer_local, struct symbol_value_buffer_local);
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227 #define XSYMBOL_VALUE_BUFFER_LOCAL(x) \
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228 XRECORD (x, symbol_value_buffer_local, struct symbol_value_buffer_local)
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229 #define SYMBOL_VALUE_BUFFER_LOCAL_P(x) RECORDP (x, symbol_value_buffer_local)
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230
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231 /* 3. symbol-value-lisp-magic */
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232
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233 enum lisp_magic_handler
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234 {
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235 MAGIC_HANDLER_GET_VALUE,
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236 MAGIC_HANDLER_SET_VALUE,
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237 MAGIC_HANDLER_BOUND_PREDICATE,
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238 MAGIC_HANDLER_MAKE_UNBOUND,
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239 MAGIC_HANDLER_LOCAL_PREDICATE,
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240 MAGIC_HANDLER_MAKE_LOCAL,
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241 MAGIC_HANDLER_MAX
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242 };
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243
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244 struct symbol_value_lisp_magic
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245 {
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246 struct symbol_value_magic magic;
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247 Lisp_Object handler[MAGIC_HANDLER_MAX];
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248 Lisp_Object harg[MAGIC_HANDLER_MAX];
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249 Lisp_Object shadowed;
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250 };
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251 DECLARE_LRECORD (symbol_value_lisp_magic, struct symbol_value_lisp_magic);
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252 #define XSYMBOL_VALUE_LISP_MAGIC(x) \
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253 XRECORD (x, symbol_value_lisp_magic, struct symbol_value_lisp_magic)
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254 #define SYMBOL_VALUE_LISP_MAGIC_P(x) RECORDP (x, symbol_value_lisp_magic)
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255
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256 /* 4. symbol-value-varalias */
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257
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258 struct symbol_value_varalias
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259 {
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260 struct symbol_value_magic magic;
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261 Lisp_Object aliasee;
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262 Lisp_Object shadowed;
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263 };
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264 DECLARE_LRECORD (symbol_value_varalias, struct symbol_value_varalias);
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265 #define XSYMBOL_VALUE_VARALIAS(x) \
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266 XRECORD (x, symbol_value_varalias, struct symbol_value_varalias)
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267 #define SYMBOL_VALUE_VARALIAS_P(x) RECORDP (x, symbol_value_varalias)
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268 #define symbol_value_varalias_aliasee(m) ((m)->aliasee)
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269 #define symbol_value_varalias_shadowed(m) ((m)->shadowed)
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270
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271 /* To define a Lisp primitive function using a C function `Fname', do this:
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272 DEFUN ("name, Fname, ...); // at top level in foo.c
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273 DEFSUBR (Fname); // in syms_of_foo();
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274 */
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275 void defsubr (Lisp_Subr *);
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276 #define DEFSUBR(Fname) defsubr (&S##Fname)
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277
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278 /* To define a Lisp primitive macro using a C function `Fname', do this:
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279 DEFUN ("name, Fname, ...); // at top level in foo.c
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280 DEFSUBR_MACRO (Fname); // in syms_of_foo();
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281 */
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282 void defsubr_macro (Lisp_Subr *);
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283 #define DEFSUBR_MACRO(Fname) defsubr_macro (&S##Fname)
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284
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442
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285 void defsymbol_massage_name (Lisp_Object *location, const char *name);
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286 void defsymbol_massage_name_nodump (Lisp_Object *location, const char *name);
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287 void defsymbol_massage_multiword_predicate (Lisp_Object *location,
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288 const char *name);
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289 void defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location,
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290 const char *name);
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291 void defsymbol (Lisp_Object *location, const char *name);
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292 void defsymbol_nodump (Lisp_Object *location, const char *name);
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293
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294 #define DEFSYMBOL(name) defsymbol_massage_name (&name, #name)
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295 #define DEFSYMBOL_NO_DUMP(name) defsymbol_massage_name_nodump (&name, #name)
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296 #define DEFSYMBOL_MULTIWORD_PREDICATE(name) \
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297 defsymbol_massage_multiword_predicate (&name, #name)
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298 #define DEFSYMBOL_MULTIWORD_PREDICATE_NO_DUMP(name) \
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299 defsymbol_massage_multiword_predicate_nodump (&name, #name)
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428
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300
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442
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301 void defkeyword (Lisp_Object *location, const char *name);
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302 void defkeyword_massage_name (Lisp_Object *location, const char *name);
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303 #define DEFKEYWORD(name) defkeyword_massage_name (&name, #name)
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428
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304
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442
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305 void deferror (Lisp_Object *symbol, const char *name,
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306 const char *message, Lisp_Object inherits_from);
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307 void deferror_massage_name (Lisp_Object *symbol, const char *name,
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308 const char *message, Lisp_Object inherits_from);
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309 void deferror_massage_name_and_message (Lisp_Object *symbol, const char *name,
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310 Lisp_Object inherits_from);
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311 #define DEFERROR(name, message, inherits_from) \
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312 deferror_massage_name (&name, #name, message, inherits_from)
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313 /* In this case, the error message is the same as the name, modulo some
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314 prettifying */
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315 #define DEFERROR_STANDARD(name, inherits_from) \
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316 deferror_massage_name_and_message (&name, #name, inherits_from)
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428
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317
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318 /* Macros we use to define forwarded Lisp variables.
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319 These are used in the syms_of_FILENAME functions. */
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320
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442
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321 void defvar_magic (const char *symbol_name, const struct symbol_value_forward *magic);
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428
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322
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323 #define DEFVAR_SYMVAL_FWD(lname, c_location, forward_type, magicfun) do { \
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442
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324 static const struct symbol_value_forward I_hate_C = \
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325 { /* struct symbol_value_forward */ \
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326 { /* struct symbol_value_magic */ \
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327 { /* struct lcrecord_header */ \
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328 { /* struct lrecord_header */ \
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329 lrecord_type_symbol_value_forward, /* lrecord_type_index */ \
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330 1, /* mark bit */ \
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331 1, /* c_readonly bit */ \
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332 1 /* lisp_readonly bit */ \
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333 }, \
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334 0, /* next */ \
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335 0, /* uid */ \
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336 0 /* free */ \
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337 }, \
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338 c_location, \
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339 forward_type \
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340 }, \
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341 magicfun \
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342 }; \
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428
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343 defvar_magic ((lname), &I_hate_C); \
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344 } while (0)
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345
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442
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346 #define DEFVAR_SYMVAL_FWD_INT(lname, c_location, forward_type, magicfun) do{ \
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347 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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348 dumpopaque (c_location, sizeof(int)); \
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349 } while (0)
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350
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428
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351 #define DEFVAR_SYMVAL_FWD_OBJECT(lname, c_location, forward_type, magicfun) do{ \
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352 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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353 staticpro (c_location); \
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354 if (EQ (*c_location, Qnull_pointer)) *c_location = Qnil; \
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355 } while (0)
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356
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357 #define DEFVAR_LISP(lname, c_location) \
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358 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, 0)
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359 #define DEFVAR_CONST_LISP(lname, c_location) \
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360 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_OBJECT_FORWARD, 0)
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361 #define DEFVAR_SPECIFIER(lname, c_location) \
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362 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_SPECIFIER_FORWARD, 0)
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363 #define DEFVAR_INT(lname, c_location) \
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442
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364 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_FIXNUM_FORWARD, 0)
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428
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365 #define DEFVAR_CONST_INT(lname, c_location) \
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442
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366 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_CONST_FIXNUM_FORWARD, 0)
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428
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367 #define DEFVAR_BOOL(lname, c_location) \
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442
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368 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, 0)
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428
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369 #define DEFVAR_CONST_BOOL(lname, c_location) \
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442
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370 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_CONST_BOOLEAN_FORWARD, 0)
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428
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371 #define DEFVAR_LISP_MAGIC(lname, c_location, magicfun) \
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440
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372 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, magicfun)
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428
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373 #define DEFVAR_INT_MAGIC(lname, c_location, magicfun) \
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442
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374 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_FIXNUM_FORWARD, magicfun)
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428
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375 #define DEFVAR_BOOL_MAGIC(lname, c_location, magicfun) \
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442
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376 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, magicfun)
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428
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377
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446
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378 void flush_all_buffer_local_cache (void);
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379
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440
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380 #endif /* INCLUDED_symeval_h_ */
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