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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 /* Synched up with: FSF 19.30. Split out from lisp.h. */
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23
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24 typedef
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25 union Lisp_Object
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185
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26 {
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27 struct
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28 {
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185
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29 #if (!!defined (WORDS_BIGENDIAN) != !!defined (LOWTAGS))
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30 /* Big-endian lowtags, little-endian hightags */
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207
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31 unsigned EMACS_INT type_mark: GCTYPEBITS + GCMARKBITS;
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185
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32 signed EMACS_INT val: VALBITS;
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33 #else /* If WORDS_BIGENDIAN, or little-endian hightags */
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185
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34 signed EMACS_INT val: VALBITS;
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207
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35 unsigned EMACS_INT mark_type: GCTYPEBITS + GCMARKBITS;
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185
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36 #endif /* BIG/LITTLE_ENDIAN vs HIGH/LOWTAGS */
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37 } s;
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38 struct
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39 {
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185
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40 #if (!!defined (WORDS_BIGENDIAN) == !!defined (LOWTAGS))
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41 unsigned EMACS_INT val: VALBITS;
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42 #endif
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43 #ifdef __GNUC__ /* Non-ANSI extension */
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185
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44 enum Lisp_Type type: GCTYPEBITS;
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45 #else
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185
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46 unsigned EMACS_INT type: GCTYPEBITS;
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47 #endif /* __GNUC__ */
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185
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48 /* The markbit is not really part of the value of a Lisp_Object,
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49 and is always zero except during garbage collection. */
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207
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50 #if GCMARKBITS > 0
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51 unsigned EMACS_INT markbit: GCMARKBITS;
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52 #endif
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185
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53 #if (!!defined (WORDS_BIGENDIAN) != !!defined (LOWTAGS))
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54 unsigned EMACS_INT val: VALBITS;
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55 #endif
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56 } gu;
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207
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57 #ifdef USE_MINIMAL_TAGBITS
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58 struct
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59 {
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60 #if (!!defined (WORDS_BIGENDIAN) != !!defined (LOWTAGS))
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61 unsigned bit: GCTYPEBITS - 1;
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62 #endif
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63 signed EMACS_INT val: VALBITS + 1;
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64 #if (!!defined (WORDS_BIGENDIAN) == !!defined (LOWTAGS))
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65 unsigned bit: GCTYPEBITS - 1;
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66 #endif
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67 } si;
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68 #endif /* USE_MINIMAL_TAGBITS */
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69 EMACS_UINT ui;
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185
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70 EMACS_INT i;
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71 /* GCC bites yet again. I fart in the general direction of
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72 the GCC authors.
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73
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74 This was formerly declared 'void *v' etc. but that causes
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75 GCC to accept any (yes, any) pointer as the argument of
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76 a function declared to accept a Lisp_Object. */
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77 struct __nosuchstruct__ *v;
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78 CONST struct __nosuchstruct__ *cv; /* C wanks */
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79 }
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80 Lisp_Object;
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81
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207
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82 #ifndef USE_MINIMAL_TAGBITS
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83 #ifndef XMAKE_LISP
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84 #if (__GNUC__ > 1)
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85 /* Use GCC's struct initializers feature */
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185
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86 #define XMAKE_LISP(vartype,value) \
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87 ((union Lisp_Object) { gu: { markbit: 0, \
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88 type: (vartype), \
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89 val: ((unsigned EMACS_INT) value) } })
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90 #endif /* __GNUC__ */
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91 #endif /* !XMAKE_LISP */
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207
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92 #endif /* ! USE_MINIMAL_TAGBITS */
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93
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94 #ifdef XMAKE_LISP
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185
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95 #define Qzero (XMAKE_LISP (Lisp_Type_Int, 0))
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96 #define make_int(a) (XMAKE_LISP (Lisp_Type_Int, (a)))
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207
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97 #define make_char(a) (XMAKE_LISP (Lisp_Type_Char, (a)))
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98 #else
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99 extern Lisp_Object Qzero;
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100 #endif
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101
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207
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102 extern Lisp_Object Qnull_pointer;
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103
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104 #define EQ(x,y) ((x).v == (y).v)
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105 #define GC_EQ(x,y) ((x).gu.val == (y).gu.val && (x).gu.type == (y).gu.type)
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106
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107 #define XTYPE(a) ((enum Lisp_Type) (a).gu.type)
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108 #define XGCTYPE(a) XTYPE (a)
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109
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110 /* This was commented out a long time ago. I uncommented it, but it
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111 makes the Alpha crash, and that's the only system that would use
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112 this, so it stays commented out. */
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113 #if 0 /* EXPLICIT_SIGN_EXTEND */
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114 /* Make sure we sign-extend; compilers have been known to fail to do so. */
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115 #define XREALINT(a) (((a).i << ((LONGBITS) - (VALBITS))) >> ((LONGBITS) - (VALBITS)))
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116 #else
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207
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117 #ifdef USE_MINIMAL_TAGBITS
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118 # define XREALINT(a) ((a).si.val)
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119 #else
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120 # define XREALINT(a) ((a).s.val)
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121 #endif
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122 #endif /* EXPLICIT_SIGN_EXTEND */
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123
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207
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124 #ifdef USE_MINIMAL_TAGBITS
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125 # define XPNTRVAL(a) ((a).ui)
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126 # define XCHARVAL(a) ((a).gu.val)
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127 #else
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128 # define XPNTRVAL(a) ((a).gu.val)
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129 # define XCHARVAL(a) XPNTRVAL(a)
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130 #endif
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131
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132 #ifdef HAVE_SHM
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133 /* In this representation, data is found in two widely separated segments. */
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134 extern int pure_size;
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135 # define XPNTR(a) \
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136 ((void *)(XPNTRVAL(a)) | (XPNTRVAL(a) > pure_size ? DATA_SEG_BITS : PURE_SEG_BITS)))
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137 #else /* not HAVE_SHM */
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138 # ifdef DATA_SEG_BITS
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139 /* This case is used for the rt-pc and hp-pa.
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140 In the diffs I was given, it checked for ptr = 0
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141 and did not adjust it in that case.
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142 But I don't think that zero should ever be found
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143 in a Lisp object whose data type says it points to something.
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144 */
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145 # define XPNTR(a) ((void *)((XPNTRVAL(a)) | DATA_SEG_BITS))
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146 # else /* not DATA_SEG_BITS */
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147 # define XPNTR(a) ((void *) (XPNTRVAL(a)))
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148 # endif /* not DATA_SEG_BITS */
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185
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149 #endif /* not HAVE_SHM */
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150
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207
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151 #ifdef USE_MINIMAL_TAGBITS
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152 # define XSETINT(a, b) \
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153 do { Lisp_Object *_xzx = &(a) ; \
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154 (*_xzx).si.val = (b) ; \
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155 (*_xzx).si.bit = 1; \
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156 } while (0)
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157 # define XSETCHAR(a, b) \
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158 do { Lisp_Object *_xzx = &(a) ; \
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159 (*_xzx).gu.val = (b) ; \
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160 (*_xzx).gu.type = Lisp_Type_Char; \
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161 } while (0)
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162 #else
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163 # define XSETINT(a, b) ((void) ((a) = make_int (b)))
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164 # define XSETCHAR(a, b) ((void) ((a) = make_char (b)))
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165 #endif
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166
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167 /* XSETOBJ was formerly named XSET. The name change was made to catch
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168 C code that attempts to use this macro. You should always use the
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169 individual settor macros (XSETCONS, XSETBUFFER, etc.) instead. */
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170
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207
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171 #ifdef USE_MINIMAL_TAGBITS
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172 # define XSETOBJ(var, vartype, value) \
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173 ((void) ((var).ui = (EMACS_UINT)(value)))
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174 #else
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175 # ifdef XMAKE_LISP
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176 # define XSETOBJ(a, type, b) ((void) ((a) = XMAKE_LISP (type, b)))
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177 # else
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178 /* This is haired up to avoid evaluating var twice...
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179 This is necessary only in the "union" version.
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180 The "int" version has never done double evaluation.
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181 */
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182 /* XEmacs change: put the assignment to val first; otherwise you
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183 can trip up the error_check_*() stuff */
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207
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184 # define XSETOBJ(var, vartype, value) \
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185
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185 do { \
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186 Lisp_Object *tmp_xset_var = &(var); \
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187 (*tmp_xset_var).s.val = ((EMACS_INT) (value)); \
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188 (*tmp_xset_var).gu.markbit = 0; \
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189 (*tmp_xset_var).gu.type = (vartype); \
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190 } while (0)
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191 # endif /* ! XMAKE_LISP */
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192 #endif /* ! USE_MINIMAL_TAGBITS */
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193
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207
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194 #if GCMARKBITS > 0
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195 /*
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196 * XMARKBIT access the markbit. Markbits are used only in particular
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197 * slots of particular structure types. Other markbits are always
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198 * zero. Outside of garbage collection, all mark bits are always
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199 * zero.
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200 */
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201 # define XMARKBIT(a) ((a).gu.markbit)
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202 # define XMARK(a) ((void) (XMARKBIT (a) = 1))
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203 # define XUNMARK(a) ((void) (XMARKBIT (a) = 0))
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213
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204 #else
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205 # define XUNMARK(a) DO_NOTHING
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207
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206 #endif
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207
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208 /* Use this for turning a (void *) into a Lisp_Object, as when the
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209 Lisp_Object is passed into a toolkit callback function */
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210 #define VOID_TO_LISP(larg,varg) \
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185
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211 ((void) ((larg).v = (struct __nosuchstruct__ *) (varg)))
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212 #define CVOID_TO_LISP(larg,varg) \
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213 ((void) ((larg).cv = (CONST struct __nosuchstruct__ *) (varg)))
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214
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215 /* Use this for turning a Lisp_Object into a (void *), as when the
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216 Lisp_Object is passed into a toolkit callback function */
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217 #define LISP_TO_VOID(larg) ((void *) ((larg).v))
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218 #define LISP_TO_CVOID(larg) ((CONST void *) ((larg).cv))
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219
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220 /* Convert a Lisp_Object into something that can't be used as an
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221 lvalue. Useful for type-checking. */
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222 #if (__GNUC__ > 1)
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223 #define NON_LVALUE(larg) ({ (larg); })
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224 #else
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225 /* Well, you can't really do it without using a function call, and
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226 there's no real point in that; no-union-type is the rule, and that
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227 will catch errors. */
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228 #define NON_LVALUE(larg) (larg)
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229 #endif
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