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428
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1 /* Fundamental definitions for XEmacs Lisp interpreter -- union objects.
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2 Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994
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3 Free Software Foundation, Inc.
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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 /* Divergent from FSF. */
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23
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24 /* Definition of Lisp_Object type as a union.
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25 The declaration order of the objects within the struct members
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26 of the union is dependent on ENDIAN-ness.
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27 See lisp-disunion.h for more details. */
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28
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29 typedef
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30 union Lisp_Object
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31 {
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32 /* if non-valbits are at lower addresses */
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442
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33 #ifdef WORDS_BIGENDIAN
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428
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34 struct
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35 {
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36 EMACS_UINT val : VALBITS;
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37 enum_field (Lisp_Type) type : GCTYPEBITS;
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38 } gu;
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39
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40 struct
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41 {
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42 signed EMACS_INT val : INT_VALBITS;
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43 unsigned int bits : INT_GCBITS;
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44 } s;
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45
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46 struct
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47 {
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48 EMACS_UINT val : INT_VALBITS;
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49 unsigned int bits : INT_GCBITS;
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50 } u;
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51 #else /* non-valbits are at higher addresses */
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52 struct
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53 {
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54 enum_field (Lisp_Type) type : GCTYPEBITS;
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55 EMACS_UINT val : VALBITS;
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56 } gu;
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57
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58 struct
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59 {
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60 unsigned int bits : INT_GCBITS;
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61 signed EMACS_INT val : INT_VALBITS;
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62 } s;
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63
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64 struct
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65 {
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66 unsigned int bits : INT_GCBITS;
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67 EMACS_UINT val : INT_VALBITS;
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68 } u;
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69
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70 #endif /* non-valbits are at higher addresses */
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71
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72 EMACS_UINT ui;
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73 signed EMACS_INT i;
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74
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75 /* This was formerly declared 'void *v' etc. but that causes
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76 GCC to accept any (yes, any) pointer as the argument of
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77 a function declared to accept a Lisp_Object. */
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78 struct nosuchstruct *v;
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442
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79 const struct nosuchstruct *cv;
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428
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80 }
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81 Lisp_Object;
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82
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83 #define XCHARVAL(x) ((x).gu.val)
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84
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85 # define XSETINT(var, value) do { \
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86 EMACS_INT xset_value = (value); \
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87 Lisp_Object *xset_var = &(var); \
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88 xset_var->s.bits = 1; \
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89 xset_var->s.val = xset_value; \
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90 } while (0)
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91 # define XSETCHAR(var, value) do { \
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92 Emchar xset_value = (value); \
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93 Lisp_Object *xset_var = &(var); \
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94 xset_var->gu.type = Lisp_Type_Char; \
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95 xset_var->gu.val = xset_value; \
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96 } while (0)
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442
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97 # define XSETOBJ(var, value) do { \
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428
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98 EMACS_UINT xset_value = (EMACS_UINT) (value); \
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99 (var).ui = xset_value; \
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100 } while (0)
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101 # define XPNTRVAL(x) ((x).ui)
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102
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442
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103 INLINE_HEADER Lisp_Object make_int (EMACS_INT val);
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104 INLINE_HEADER Lisp_Object
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428
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105 make_int (EMACS_INT val)
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106 {
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107 Lisp_Object obj;
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442
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108 XSETINT (obj, val);
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428
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109 return obj;
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110 }
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111
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442
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112 INLINE_HEADER Lisp_Object make_char (Emchar val);
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113 INLINE_HEADER Lisp_Object
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428
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114 make_char (Emchar val)
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115 {
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116 Lisp_Object obj;
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442
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117 XSETCHAR (obj, val);
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118 return obj;
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119 }
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120
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121 INLINE_HEADER Lisp_Object wrap_object (void *ptr);
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122 INLINE_HEADER Lisp_Object
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123 wrap_object (void *ptr)
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124 {
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125 Lisp_Object obj;
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126 XSETOBJ (obj, ptr);
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428
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127 return obj;
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128 }
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129
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130 extern Lisp_Object Qnull_pointer, Qzero;
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131
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132 #define XREALINT(x) ((x).s.val)
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133 #define XUINT(x) ((x).u.val)
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134 #define XTYPE(x) ((x).gu.type)
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135 #define EQ(x,y) ((x).v == (y).v)
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136
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137 #define INTP(x) ((x).s.bits)
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138 #define INT_PLUS(x,y) make_int (XINT (x) + XINT (y))
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139 #define INT_MINUS(x,y) make_int (XINT (x) - XINT (y))
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140 #define INT_PLUS1(x) make_int (XINT (x) + 1)
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141 #define INT_MINUS1(x) make_int (XINT (x) - 1)
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142
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143 /* Convert between a (void *) and a Lisp_Object, as when the
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144 Lisp_Object is passed to a toolkit callback function */
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145 #define VOID_TO_LISP(larg,varg) \
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146 ((void) ((larg).v = (struct nosuchstruct *) (varg)))
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147 #define CVOID_TO_LISP(larg,varg) \
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442
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148 ((void) ((larg).cv = (const struct nosuchstruct *) (varg)))
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428
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149 #define LISP_TO_VOID(larg) ((void *) ((larg).v))
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442
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150 #define LISP_TO_CVOID(larg) ((const void *) ((larg).cv))
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428
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151
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152 /* Convert a Lisp_Object into something that can't be used as an
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153 lvalue. Useful for type-checking. */
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154 #if (__GNUC__ > 1)
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155 #define NON_LVALUE(larg) ({ (larg); })
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156 #else
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157 /* Well, you can't really do it without using a function call, and
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158 there's no real point in that; no-union-type is the rule, and that
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159 will catch errors. */
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160 #define NON_LVALUE(larg) (larg)
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161 #endif
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