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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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31 unsigned EMACS_INT type_mark: GCTYPEBITS + 1;
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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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35 unsigned EMACS_INT mark_type: GCTYPEBITS + 1;
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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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50 unsigned EMACS_INT markbit: 1;
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51 #if (!!defined (WORDS_BIGENDIAN) != !!defined (LOWTAGS))
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52 unsigned EMACS_INT val: VALBITS;
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53 #endif
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54 } gu;
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55 EMACS_INT i;
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56 /* GCC bites yet again. I fart in the general direction of
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57 the GCC authors.
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58
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59 This was formerly declared 'void *v' etc. but that causes
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60 GCC to accept any (yes, any) pointer as the argument of
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61 a function declared to accept a Lisp_Object. */
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62 struct __nosuchstruct__ *v;
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63 CONST struct __nosuchstruct__ *cv; /* C wanks */
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64 }
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65 Lisp_Object;
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66
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67 #ifndef XMAKE_LISP
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68 #if (__GNUC__ > 1)
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69 /* Use GCC's struct initializers feature */
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70 #define XMAKE_LISP(vartype,value) \
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71 ((union Lisp_Object) { gu: { markbit: 0, \
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72 type: (vartype), \
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73 val: ((unsigned EMACS_INT) value) } })
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74 #endif /* __GNUC__ */
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75 #endif /* !XMAKE_LISP */
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76
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77
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78 #ifdef XMAKE_LISP
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185
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79 #define Qzero (XMAKE_LISP (Lisp_Type_Int, 0))
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80 #define make_int(a) (XMAKE_LISP (Lisp_Type_Int, (a)))
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81 #else
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82 extern Lisp_Object Qzero;
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83 #endif
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84
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85
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86 #define EQ(x,y) ((x).v == (y).v)
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87 #define GC_EQ(x,y) ((x).gu.val == (y).gu.val && (x).gu.type == (y).gu.type)
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88
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89 #define XTYPE(a) ((enum Lisp_Type) (a).gu.type)
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90 #define XGCTYPE(a) XTYPE (a)
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91
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92 /* This was commented out a long time ago. I uncommented it, but it
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93 makes the Alpha crash, and that's the only system that would use
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94 this, so it stays commented out. */
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95 #if 0 /* EXPLICIT_SIGN_EXTEND */
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96 /* Make sure we sign-extend; compilers have been known to fail to do so. */
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97 #define XREALINT(a) (((a).i << ((LONGBITS) - (VALBITS))) >> ((LONGBITS) - (VALBITS)))
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98 #else
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99 #define XREALINT(a) ((a).s.val)
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100 #endif /* EXPLICIT_SIGN_EXTEND */
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101
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102 #define XUINT(a) ((a).gu.val)
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103 #ifdef HAVE_SHM
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104 /* In this representation, data is found in two widely separated segments. */
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105 extern int pure_size;
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106 # define XPNTR(a) \
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107 ((void *)(((a).gu.val) | ((a).gu.val > pure_size ? DATA_SEG_BITS : PURE_SEG_BITS)))
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108 #else /* not HAVE_SHM */
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109 # ifdef DATA_SEG_BITS
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110 /* This case is used for the rt-pc and hp-pa.
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111 In the diffs I was given, it checked for ptr = 0
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112 and did not adjust it in that case.
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113 But I don't think that zero should ever be found
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114 in a Lisp object whose data type says it points to something.
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115 */
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116 # define XPNTR(a) ((void *)(((a).gu.val) | DATA_SEG_BITS))
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117 # else /* not DATA_SEG_BITS */
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118 # define XPNTR(a) ((void *) ((a).gu.val))
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119 # endif /* not DATA_SEG_BITS */
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185
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120 #endif /* not HAVE_SHM */
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121 #define XSETINT(a, b) ((void) ((a) = make_int (b)))
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122
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123 #define XSETCHAR(a, b) ((void) ((a) = make_char (b)))
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124
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125 /* XSETOBJ was formerly named XSET. The name change was made to catch
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126 C code that attempts to use this macro. You should always use the
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127 individual settor macros (XSETCONS, XSETBUFFER, etc.) instead. */
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128
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129 #ifdef XMAKE_LISP
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185
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130 #define XSETOBJ(a, type, b) ((void) ((a) = XMAKE_LISP (type, b)))
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131 #else
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132 /* This is haired up to avoid evaluating var twice...
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133 This is necessary only in the "union" version.
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134 The "int" version has never done double evaluation.
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135 */
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136 /* XEmacs change: put the assignment to val first; otherwise you
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137 can trip up the error_check_*() stuff */
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185
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138 #define XSETOBJ(var, vartype, value) \
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139 do { \
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140 Lisp_Object *tmp_xset_var = &(var); \
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141 (*tmp_xset_var).s.val = ((EMACS_INT) (value)); \
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142 (*tmp_xset_var).gu.markbit = 0; \
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143 (*tmp_xset_var).gu.type = (vartype); \
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144 } while (0)
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145 #endif /* undefined XMAKE_LISP */
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146
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147 /* During garbage collection, XGCTYPE must be used for extracting types
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148 so that the mark bit is ignored. XMARKBIT access the markbit.
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149 Markbits are used only in particular slots of particular structure types.
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150 Other markbits are always zero.
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151 Outside of garbage collection, all mark bits are always zero. */
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152
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153 #define XMARKBIT(a) ((a).gu.markbit)
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185
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154 #define XMARK(a) ((void) (XMARKBIT (a) = 1))
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155 #define XUNMARK(a) ((void) (XMARKBIT (a) = 0))
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156
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157 /* Use this for turning a (void *) into a Lisp_Object, as when the
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158 Lisp_Object is passed into a toolkit callback function */
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159 #define VOID_TO_LISP(larg,varg) \
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185
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160 ((void) ((larg).v = (struct __nosuchstruct__ *) (varg)))
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161 #define CVOID_TO_LISP(larg,varg) \
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162 ((void) ((larg).cv = (CONST struct __nosuchstruct__ *) (varg)))
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163
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164 /* Use this for turning a Lisp_Object into a (void *), as when the
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165 Lisp_Object is passed into a toolkit callback function */
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166 #define LISP_TO_VOID(larg) ((void *) ((larg).v))
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167 #define LISP_TO_CVOID(larg) ((CONST void *) ((larg).cv))
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168
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169 /* Convert a Lisp_Object into something that can't be used as an
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170 lvalue. Useful for type-checking. */
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171 #if (__GNUC__ > 1)
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172 #define NON_LVALUE(larg) ({ (larg); })
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173 #else
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174 /* Well, you can't really do it without using a function call, and
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175 there's no real point in that; no-union-type is the rule, and that
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176 will catch errors. */
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177 #define NON_LVALUE(larg) (larg)
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178 #endif
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