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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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272
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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 and USE_MINIMAL_TAGBITS.
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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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185
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31 {
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32 /* if non-valbits are at lower addresses */
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33 #if defined(WORDS_BIGENDIAN) == defined(USE_MINIMAL_TAGBITS)
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185
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34 struct
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35 {
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272
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36 EMACS_UINT val : VALBITS;
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37 #if GCMARKBITS > 0
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38 unsigned int markbit: GCMARKBITS;
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39 #endif
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40 enum_field (Lisp_Type) type : GCTYPEBITS;
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41 } gu;
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42
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43 struct
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44 {
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45 signed EMACS_INT val : INT_VALBITS;
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46 unsigned int bits : INT_GCBITS;
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185
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47 } s;
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272
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48
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49 struct
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50 {
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51 EMACS_UINT val : INT_VALBITS;
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52 unsigned int bits : INT_GCBITS;
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53 } u;
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54 #else /* non-valbits are at higher addresses */
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185
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55 struct
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56 {
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272
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57 enum_field (Lisp_Type) type : GCTYPEBITS;
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58 #if GCMARKBITS > 0
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59 unsigned int markbit: GCMARKBITS;
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185
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60 #endif
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272
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61 EMACS_UINT val : VALBITS;
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185
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62 } gu;
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272
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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 signed EMACS_INT val : INT_VALBITS;
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68 } s;
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69
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70 struct
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71 {
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72 unsigned int bits : INT_GCBITS;
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73 EMACS_UINT val : INT_VALBITS;
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74 } u;
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75
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76 #endif /* non-valbits are at higher addresses */
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77
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78 EMACS_UINT ui;
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272
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79 signed EMACS_INT i;
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80
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81 /* This was formerly declared 'void *v' etc. but that causes
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82 GCC to accept any (yes, any) pointer as the argument of
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83 a function declared to accept a Lisp_Object. */
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272
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84 struct nosuchstruct *v;
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85 CONST struct nosuchstruct *cv;
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185
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86 }
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87 Lisp_Object;
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88
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89 #define XCHARVAL(x) ((x).gu.val)
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90
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91 #ifdef USE_MINIMAL_TAGBITS
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92 # define XSETINT(var, value) do { \
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93 Lisp_Object *_xzx = &(var); \
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94 _xzx->s.val = (value); \
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95 _xzx->s.bits = 1; \
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96 } while (0)
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97 # define XSETCHAR(var, value) do { \
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98 Lisp_Object *_xzx = &(var); \
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99 _xzx->gu.val = (EMACS_UINT) (value); \
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100 _xzx->gu.type = Lisp_Type_Char; \
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101 } while (0)
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102 # define XSETOBJ(var, vartype, value) \
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103 ((void) ((var).ui = (EMACS_UINT) (value)))
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104 # define XPNTRVAL(x) ((x).ui)
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105 #else /* ! USE_MINIMAL_TAGBITS */
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106 # define XSETOBJ(var, vartype, value) do { \
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107 Lisp_Object *_xzx = &(var); \
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108 _xzx->gu.val = (EMACS_UINT) (value); \
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109 _xzx->gu.type = (vartype); \
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110 _xzx->gu.markbit = 0; \
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111 } while (0)
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112 # define XSETINT(var, value) XSETOBJ (var, Lisp_Type_Int, value)
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113 # define XSETCHAR(var, value) XSETOBJ (var, Lisp_Type_Char, value)
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114 # define XPNTRVAL(x) ((x).gu.val)
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115 #endif /* ! USE_MINIMAL_TAGBITS */
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116
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117 INLINE Lisp_Object make_int (EMACS_INT val);
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118 INLINE Lisp_Object
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119 make_int (EMACS_INT val)
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120 {
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121 Lisp_Object obj;
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122 XSETINT(obj, val);
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123 return obj;
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124 }
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125
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272
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126 INLINE Lisp_Object make_char (Emchar val);
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127 INLINE Lisp_Object
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128 make_char (Emchar val)
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129 {
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130 Lisp_Object obj;
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131 XSETCHAR(obj, val);
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132 return obj;
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133 }
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134
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272
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135 extern Lisp_Object Qnull_pointer, Qzero;
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136
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137 #define XREALINT(x) ((x).s.val)
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138 #define XUINT(x) ((x).u.val)
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139 #define XTYPE(x) ((x).gu.type)
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140 #define XGCTYPE(x) XTYPE (x)
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141 #define EQ(x,y) ((x).v == (y).v)
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142
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207
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143 #ifdef USE_MINIMAL_TAGBITS
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272
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144 #define INTP(x) ((x).s.bits)
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145 #define GC_EQ(x,y) EQ (x, y)
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259
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146 #else
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147 #define INTP(x) (XTYPE(x) == Lisp_Type_Int)
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148 #define GC_EQ(x,y) ((x).gu.val == (y).gu.val && XTYPE (x) == XTYPE (y))
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207
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149 #endif
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150
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272
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151 #if GCMARKBITS > 0
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152 /* XMARKBIT accesses the markbit. Markbits are used only in
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153 particular slots of particular structure types. Other markbits are
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154 always zero. Outside of garbage collection, all mark bits are
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155 always zero. */
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156 # define XMARKBIT(x) ((x).gu.markbit)
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157 # define XMARK(x) ((void) (XMARKBIT (x) = 1))
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158 # define XUNMARK(x) ((void) (XMARKBIT (x) = 0))
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207
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159 #else
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272
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160 # define XUNMARK(x) DO_NOTHING
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207
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161 #endif
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162
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272
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163 /* Convert between a (void *) and a Lisp_Object, as when the
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164 Lisp_Object is passed to a toolkit callback function */
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165 #define VOID_TO_LISP(larg,varg) \
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166 ((void) ((larg).v = (struct nosuchstruct *) (varg)))
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167 #define CVOID_TO_LISP(larg,varg) \
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168 ((void) ((larg).cv = (CONST struct nosuchstruct *) (varg)))
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169 #define LISP_TO_VOID(larg) ((void *) ((larg).v))
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170 #define LISP_TO_CVOID(larg) ((CONST void *) ((larg).cv))
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171
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172 /* Convert a Lisp_Object into something that can't be used as an
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173 lvalue. Useful for type-checking. */
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174 #if (__GNUC__ > 1)
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175 #define NON_LVALUE(larg) ({ (larg); })
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176 #else
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177 /* Well, you can't really do it without using a function call, and
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178 there's no real point in that; no-union-type is the rule, and that
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179 will catch errors. */
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180 #define NON_LVALUE(larg) (larg)
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181 #endif
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