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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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1743
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30 BEGIN_C_DECLS
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1650
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31
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428
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32 enum symbol_value_type
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33 {
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34 /* The following tags use the 'symbol_value_forward' structure
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35 and are strictly for variables DEFVARed on the C level. */
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458
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36 SYMVAL_FIXNUM_FORWARD, /* Forward C "Fixnum", really "EMACS_INT" */
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428
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37 SYMVAL_CONST_FIXNUM_FORWARD, /* Same, but can't be set */
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38 SYMVAL_BOOLEAN_FORWARD, /* Forward C boolean ("int") */
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39 SYMVAL_CONST_BOOLEAN_FORWARD, /* Same, but can't be set */
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40 SYMVAL_OBJECT_FORWARD, /* Forward C Lisp_Object */
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41 SYMVAL_CONST_OBJECT_FORWARD, /* Same, but can't be set */
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42 SYMVAL_CONST_SPECIFIER_FORWARD, /* Same, can't be set, but gives a
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43 different message when attempting to
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44 set that says "use set-specifier" */
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45 SYMVAL_DEFAULT_BUFFER_FORWARD, /* Forward Lisp_Object into Vbuffer_defaults */
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46 SYMVAL_CURRENT_BUFFER_FORWARD, /* Forward Lisp_Object into current_buffer */
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47 SYMVAL_CONST_CURRENT_BUFFER_FORWARD, /* Forward Lisp_Object into
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48 current_buffer, can't be set */
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49 SYMVAL_DEFAULT_CONSOLE_FORWARD, /* Forward Lisp_Object into
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50 Vconsole_defaults */
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51 SYMVAL_SELECTED_CONSOLE_FORWARD, /* Forward Lisp_Object into
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52 Vselected_console */
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53 SYMVAL_CONST_SELECTED_CONSOLE_FORWARD, /* Forward Lisp_Object into
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54 Vselected_console,
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55 can't be set */
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56 SYMVAL_UNBOUND_MARKER, /* Only Qunbound actually has this tag */
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57
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58 /* The following tags use the 'symbol_value_buffer_local' structure */
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59 SYMVAL_BUFFER_LOCAL, /* make-variable-buffer-local */
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60 SYMVAL_SOME_BUFFER_LOCAL, /* make-local-variable */
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61
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62 /* The following tag uses the 'symbol_value_lisp_magic' structure */
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63 SYMVAL_LISP_MAGIC, /* Forward to lisp callbacks */
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64
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65 /* The following tag uses the 'symbol_value_varalias' structure */
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66 SYMVAL_VARALIAS /* defvaralias */
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67
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68 #if 0
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69 /* NYI */
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70 SYMVAL_CONSTANT_SYMBOL, /* Self-evaluating symbol */
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71 /* NYI */
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72 #endif
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73 };
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74
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458
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75 /* Underlying C type used to implement DEFVAR_INT */
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76 typedef EMACS_INT Fixnum;
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77
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428
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78 struct symbol_value_magic
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79 {
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80 struct lcrecord_header lcheader;
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442
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81 void *value;
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428
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82 enum symbol_value_type type;
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83 };
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442
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84 #define SYMBOL_VALUE_MAGIC_P(x) \
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85 (LRECORDP (x) && \
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86 XRECORD_LHEADER (x)->type <= lrecord_type_max_symbol_value_magic)
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428
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87 #define XSYMBOL_VALUE_MAGIC_TYPE(v) \
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88 (((struct symbol_value_magic *) XPNTR (v))->type)
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793
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89 #define wrap_symbol_value_magic(p) wrap_pointer_1 (p)
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428
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90 void print_symbol_value_magic (Lisp_Object, Lisp_Object, int);
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91
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92 /********** The various different symbol-value-magic types ***********/
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93
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94 /* 1. symbol-value-forward */
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95
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96 /* This type of symbol-value-magic is used for variables declared
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97 DEFVAR_LISP, DEFVAR_INT, DEFVAR_BOOL, DEFVAR_BUFFER_LOCAL,
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98 DEFVAR_BUFFER_DEFAULTS, DEFVAR_SPECIFIER, and for Qunbound.
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99
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100 Note that some of these types of variables can be made buffer-local.
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101 Then, the symbol's value field contains a symbol-value-buffer-local,
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102 whose CURRENT-VALUE field then contains a symbol-value-forward.
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103 */
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104
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105 struct symbol_value_forward
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106 {
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107 struct symbol_value_magic magic;
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108
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109 /* `magicfun' is a function controlling the magic behavior of this
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110 forward variable.
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111
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112 SYM is the symbol being operated on (read, set, etc.);
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113
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114 VAL is either the value to set or the value to be returned.
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115
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116 IN_OBJECT is the buffer or console that the value is read in
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117 or set in. A value of Qnil means that the current buffer
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118 and possibly other buffers are being set. (This value will
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119 never be passed for built-in buffer-local or console-local
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120 variables such as `truncate-lines'.) (Currently, a value of
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121 Qnil is always passed for DEFVAR_INT, DEFVAR_LISP, and
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122 DEFVAR_BOOL variables; the code isn't smart enough to figure
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123 out what buffers besides the current buffer are being
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124 affected. Because the magic function is called
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125 before the value is changed, it's not that easy
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126 to determine which buffers are getting changed.
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127 #### If this information is important, let me know
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128 and I will look into providing it.) (Remember also
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129 that the only console-local variables currently existing
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130 are built-in ones, because others can't be created.)
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131
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132 FLAGS gives more information about the operation being performed.
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133
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134 The return value indicates what the magic function actually did.
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135
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136 Currently FLAGS and the return value are not used. This
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137 function is only called when the value of a forward variable
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138 is about to be changed. Note that this can occur explicitly
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139 through a call to `set', `setq', `set-default', or `setq-default',
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140 or implicitly by the current buffer being changed. */
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141 int (*magicfun) (Lisp_Object sym, Lisp_Object *val, Lisp_Object in_object,
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142 int flags);
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143 };
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144 DECLARE_LRECORD (symbol_value_forward, struct symbol_value_forward);
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145 #define XSYMBOL_VALUE_FORWARD(x) \
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146 XRECORD (x, symbol_value_forward, struct symbol_value_forward)
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442
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147 #define symbol_value_forward_forward(m) ((void *)((m)->magic.value))
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428
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148 #define symbol_value_forward_magicfun(m) ((m)->magicfun)
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149
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150 /* 2. symbol-value-buffer-local */
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151
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152 struct symbol_value_buffer_local
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153 {
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154 struct symbol_value_magic magic;
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155 /* Used in a symbol value cell when the symbol's value is per-buffer.
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156
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157 The type of the symbol-value-magic will be either
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158 SYMVAL_BUFFER_LOCAL (i.e. `make-variable-buffer-local' was called)
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159 or SYMVAL_SOME_BUFFER_LOCAL (i.e. `make-local-variable' was called).
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160 The only difference between the two is that when setting the
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161 former kind of variable, an implicit `make-local-variable' is
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162 called.
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163
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164 A buffer-local variable logically has
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165
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166 -- a default value
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167 -- local values in some buffers
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168
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169 The primary place where the local values are stored is in each
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170 buffer's local_var_alist slot.
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171
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172 In the simplest implementation, all that this structure needs to
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173 keep track of is the default value; to retrieve the value in
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174 a buffer, look in that buffer's local_var_alist, and use the
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175 default value if there is no local value. To implement
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176 `make-local-variable' in a buffer, look in the buffer's
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177 local_var_alist, and if no element exists for this symbol,
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178 add one, copying the value from the default value. When setting
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179 the value in a buffer, look in the buffer's local_var_alist, and set
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180 the value in that list if an element exists for this symbol;
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181 otherwise, set the default. (Remember that SYMVAL_BUFFER_LOCAL
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182 variables implicitly call `make-local-variable' first, so when
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183 setting a value, there will always be an entry in the buffer's
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184 local_var_alist to set.)
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185
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186 However, this operation is potentially slow. To speed it up,
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187 we cache the value in one buffer in this structure.
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188
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189 NOTE: This is *not* a write-through cache. I.e. when setting
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190 the value in the buffer that is cached, we *only* change the
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191 cache and don't write the value through to either the buffer's
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192 local_var_alist or the default value. Therefore, when retrieving
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193 a value in a buffer, you must *always* look in the cache to see if
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194 it refers to that buffer.
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195
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196 The cache consists of
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197
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198 -- a buffer, or nil if the cache has not been set up
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199 -- the value in that buffer
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200 -- the element (a cons) from the buffer's local_var_alist, or
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201 nil if there is no local value in the buffer
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202
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203 These slots are called CURRENT-BUFFER, CURRENT-VALUE, and
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204 CURRENT-ALIST-ELEMENT, respectively.
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205
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206 If we want to examine or set the value in BUFFER and CURRENT-BUFFER
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207 equals BUFFER, we just examine or set CURRENT-VALUE. Otherwise,
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208 we store CURRENT-VALUE value into CURRENT-ALIST-ELEMENT (or maybe
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209 into DEFAULT-VALUE), then find the appropriate alist element for
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210 BUFFER and set up CURRENT-ALIST-ELEMENT. Then we set CURRENT-VALUE
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211 out of that element (or maybe out of DEFAULT-VALUE), and store
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212 BUFFER into CURRENT-BUFFER.
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213
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214 If we are setting the variable and the current buffer does not have
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215 an alist entry for this variable, an alist entry is created.
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216
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217 Note that CURRENT-BUFFER's local_var_alist value for this variable
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218 might be out-of-date (the correct value is stored in CURRENT-VALUE).
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219 Similarly, if CURRENT-BUFFER sees the default value, then
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220 DEFAULT-VALUE might be out-of-date.
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221
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222 Note that CURRENT-VALUE (but not DEFAULT-VALUE) can be a
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223 forwarding pointer. Each time it is examined or set,
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224 forwarding must be done.
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225 */
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226 Lisp_Object default_value;
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227 Lisp_Object current_value;
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228 Lisp_Object current_buffer;
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229 Lisp_Object current_alist_element;
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230 };
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231 DECLARE_LRECORD (symbol_value_buffer_local, struct symbol_value_buffer_local);
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232 #define XSYMBOL_VALUE_BUFFER_LOCAL(x) \
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233 XRECORD (x, symbol_value_buffer_local, struct symbol_value_buffer_local)
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234 #define SYMBOL_VALUE_BUFFER_LOCAL_P(x) RECORDP (x, symbol_value_buffer_local)
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235
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236 /* 3. symbol-value-lisp-magic */
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237
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238 enum lisp_magic_handler
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239 {
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240 MAGIC_HANDLER_GET_VALUE,
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241 MAGIC_HANDLER_SET_VALUE,
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242 MAGIC_HANDLER_BOUND_PREDICATE,
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243 MAGIC_HANDLER_MAKE_UNBOUND,
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244 MAGIC_HANDLER_LOCAL_PREDICATE,
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245 MAGIC_HANDLER_MAKE_LOCAL,
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246 MAGIC_HANDLER_MAX
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247 };
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248
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249 struct symbol_value_lisp_magic
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250 {
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251 struct symbol_value_magic magic;
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252 Lisp_Object handler[MAGIC_HANDLER_MAX];
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253 Lisp_Object harg[MAGIC_HANDLER_MAX];
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254 Lisp_Object shadowed;
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255 };
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256 DECLARE_LRECORD (symbol_value_lisp_magic, struct symbol_value_lisp_magic);
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257 #define XSYMBOL_VALUE_LISP_MAGIC(x) \
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258 XRECORD (x, symbol_value_lisp_magic, struct symbol_value_lisp_magic)
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259 #define SYMBOL_VALUE_LISP_MAGIC_P(x) RECORDP (x, symbol_value_lisp_magic)
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260
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261 /* 4. symbol-value-varalias */
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262
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263 struct symbol_value_varalias
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264 {
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265 struct symbol_value_magic magic;
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266 Lisp_Object aliasee;
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267 Lisp_Object shadowed;
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268 };
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269 DECLARE_LRECORD (symbol_value_varalias, struct symbol_value_varalias);
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270 #define XSYMBOL_VALUE_VARALIAS(x) \
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271 XRECORD (x, symbol_value_varalias, struct symbol_value_varalias)
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272 #define SYMBOL_VALUE_VARALIAS_P(x) RECORDP (x, symbol_value_varalias)
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273 #define symbol_value_varalias_aliasee(m) ((m)->aliasee)
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274 #define symbol_value_varalias_shadowed(m) ((m)->shadowed)
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275
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276 /* To define a Lisp primitive function using a C function `Fname', do this:
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277 DEFUN ("name, Fname, ...); // at top level in foo.c
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278 DEFSUBR (Fname); // in syms_of_foo();
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279 */
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1632
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280 MODULE_API void defsubr (Lisp_Subr *);
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428
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281 #define DEFSUBR(Fname) defsubr (&S##Fname)
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282
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283 /* To define a Lisp primitive macro using a C function `Fname', do this:
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284 DEFUN ("name, Fname, ...); // at top level in foo.c
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285 DEFSUBR_MACRO (Fname); // in syms_of_foo();
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286 */
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1632
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287 MODULE_API void defsubr_macro (Lisp_Subr *);
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428
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288 #define DEFSUBR_MACRO(Fname) defsubr_macro (&S##Fname)
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289
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1632
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290 MODULE_API void defsymbol_massage_name (Lisp_Object *location,
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291 const char *name);
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292 MODULE_API void defsymbol_massage_name_nodump (Lisp_Object *location,
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293 const char *name);
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294 MODULE_API void defsymbol_massage_multiword_predicate (Lisp_Object *location,
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295 const char *name);
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296 MODULE_API void
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297 defsymbol_massage_multiword_predicate_nodump (Lisp_Object *location,
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298 const char *name);
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299 MODULE_API void defsymbol (Lisp_Object *location, const char *name);
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300 MODULE_API void defsymbol_nodump (Lisp_Object *location, const char *name);
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442
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301
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563
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302 /* Defining symbols:
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303
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304 (1) A standard symbol is defined with DEFSYMBOL. That means that
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305 the symbol's print name can be derived from the symbol's variable
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306 name by removing the initial Q and replacing underscores with hyphens.
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307 (2) A keyword symbol is defined with DEFKEYWORD. That means that
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308 the symbol's print name can be derived from the symbol's variable
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309 name by removing the initial Q and replacing underscores with hyphens,
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310 except that the initial underscore, which comes directly after the Q,
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311 is replaced by a colon.
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312 (3) DEFSYMBOL_MULTIWORD_PREDICATE is used for the predicates that are
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313 associated with a particular type of Lisp Object. Because of the
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314 limitations of C macros, they're always given a predicate symbol
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315 whose C name simply appends `p' to the type name, modulo hyphen/
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316 underscore conversion. Properly, however, the Lisp name should have
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317 `-p' if there is more than one word in the type name.
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318 DEFSYMBOL_MULTIWORD_PREDICATE is for these weird symbols -- the
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319 C name as supplied to the macro should end with a `p' with no
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320 underscore before it, and the macro will insert a hyphen there in
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321 the Lisp name.
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322 (4) In case you have some weird symbol where the equivalence between
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323 the C and Lisp names is more complicated (e.g. the Lisp symbol has
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324 non-alphabetic, non-numeric characters in it), you can just call
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325 defsymbol() (the lowercase version) directly.
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326 */
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327
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442
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328 #define DEFSYMBOL(name) defsymbol_massage_name (&name, #name)
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329 #define DEFSYMBOL_NO_DUMP(name) defsymbol_massage_name_nodump (&name, #name)
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330 #define DEFSYMBOL_MULTIWORD_PREDICATE(name) \
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331 defsymbol_massage_multiword_predicate (&name, #name)
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332 #define DEFSYMBOL_MULTIWORD_PREDICATE_NO_DUMP(name) \
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333 defsymbol_massage_multiword_predicate_nodump (&name, #name)
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428
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334
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1632
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335 MODULE_API void defkeyword (Lisp_Object *location, const char *name);
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336 MODULE_API void defkeyword_massage_name (Lisp_Object *location,
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337 const char *name);
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442
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338 #define DEFKEYWORD(name) defkeyword_massage_name (&name, #name)
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428
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339
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1632
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340 MODULE_API void deferror (Lisp_Object *symbol, const char *name,
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341 const char *message, Lisp_Object inherits_from);
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342 MODULE_API void deferror_massage_name (Lisp_Object *symbol, const char *name,
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343 const char *message,
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344 Lisp_Object inherits_from);
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345 MODULE_API void deferror_massage_name_and_message (Lisp_Object *symbol,
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346 const char *name,
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347 Lisp_Object inherits_from);
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442
|
348 #define DEFERROR(name, message, inherits_from) \
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349 deferror_massage_name (&name, #name, message, inherits_from)
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350 /* In this case, the error message is the same as the name, modulo some
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351 prettifying */
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352 #define DEFERROR_STANDARD(name, inherits_from) \
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353 deferror_massage_name_and_message (&name, #name, inherits_from)
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428
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354
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355 /* Macros we use to define forwarded Lisp variables.
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356 These are used in the syms_of_FILENAME functions. */
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357
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1632
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358 MODULE_API void defvar_magic (const char *symbol_name,
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359 const struct symbol_value_forward *magic);
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428
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360
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771
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361 #define DEFVAR_SYMVAL_FWD(lname, c_location, forward_type, magicfun) \
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362 do \
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363 { \
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364 static const struct symbol_value_forward I_hate_C = \
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365 { /* struct symbol_value_forward */ \
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366 { /* struct symbol_value_magic */ \
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367 { /* struct lcrecord_header */ \
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368 { /* struct lrecord_header */ \
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369 lrecord_type_symbol_value_forward, /* lrecord_type_index */ \
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370 1, /* mark bit */ \
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371 1, /* c_readonly bit */ \
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1111
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372 1, /* lisp_readonly bit */ \
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373 0 /* unused */ \
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771
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374 }, \
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375 0, /* next */ \
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376 0, /* uid */ \
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377 0 /* free */ \
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378 }, \
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379 c_location, \
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380 forward_type \
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381 }, \
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382 magicfun \
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383 }; \
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384 defvar_magic ((lname), &I_hate_C); \
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428
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385 } while (0)
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386
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771
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387 #define DEFVAR_SYMVAL_FWD_INT(lname, c_location, forward_type, magicfun) \
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388 do \
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389 { \
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390 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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391 dump_add_opaque_int (c_location); \
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458
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392 } while (0)
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393
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771
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394 #define DEFVAR_SYMVAL_FWD_FIXNUM(lname, c_location, forward_type, magicfun) \
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395 do \
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396 { \
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397 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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398 dump_add_opaque_fixnum (c_location); \
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442
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399 } while (0)
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400
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771
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401 #define DEFVAR_SYMVAL_FWD_OBJECT(lname, c_location, forward_type, magicfun) \
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402 do \
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403 { \
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404 DEFVAR_SYMVAL_FWD (lname, c_location, forward_type, magicfun); \
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405 { \
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406 Lisp_Object *DSF_location = c_location; /* Type check */ \
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407 staticpro (DSF_location); \
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408 if (EQ (*DSF_location, Qnull_pointer)) *DSF_location = Qnil; \
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409 } \
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428
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410 } while (0)
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411
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412 #define DEFVAR_LISP(lname, c_location) \
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413 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, 0)
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414 #define DEFVAR_CONST_LISP(lname, c_location) \
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415 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_OBJECT_FORWARD, 0)
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416 #define DEFVAR_SPECIFIER(lname, c_location) \
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417 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_CONST_SPECIFIER_FORWARD, 0)
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418 #define DEFVAR_INT(lname, c_location) \
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458
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419 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_FIXNUM_FORWARD, 0)
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428
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420 #define DEFVAR_CONST_INT(lname, c_location) \
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458
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421 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_CONST_FIXNUM_FORWARD, 0)
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428
|
422 #define DEFVAR_BOOL(lname, c_location) \
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442
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423 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, 0)
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428
|
424 #define DEFVAR_CONST_BOOL(lname, c_location) \
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442
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425 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_CONST_BOOLEAN_FORWARD, 0)
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428
|
426 #define DEFVAR_LISP_MAGIC(lname, c_location, magicfun) \
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440
|
427 DEFVAR_SYMVAL_FWD_OBJECT (lname, c_location, SYMVAL_OBJECT_FORWARD, magicfun)
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428
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428 #define DEFVAR_INT_MAGIC(lname, c_location, magicfun) \
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458
|
429 DEFVAR_SYMVAL_FWD_FIXNUM (lname, c_location, SYMVAL_FIXNUM_FORWARD, magicfun)
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428
|
430 #define DEFVAR_BOOL_MAGIC(lname, c_location, magicfun) \
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442
|
431 DEFVAR_SYMVAL_FWD_INT (lname, c_location, SYMVAL_BOOLEAN_FORWARD, magicfun)
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428
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432
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446
|
433 void flush_all_buffer_local_cache (void);
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434
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1743
|
435 END_C_DECLS
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|
1650
|
436
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440
|
437 #endif /* INCLUDED_symeval_h_ */
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