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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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800
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4 Copyright (C) 2002 Ben Wing.
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428
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Divergent from FSF. */
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24
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25 /* Definition of Lisp_Object type as a union.
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26 The declaration order of the objects within the struct members
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27 of the union is dependent on ENDIAN-ness.
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28 See lisp-disunion.h for more details. */
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29
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30 typedef
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31 union Lisp_Object
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32 {
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33 /* if non-valbits are at lower addresses */
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34 #ifdef WORDS_BIGENDIAN
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428
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35 struct
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36 {
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37 EMACS_UINT val : VALBITS;
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38 enum_field (Lisp_Type) type : GCTYPEBITS;
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39 } gu;
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40
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41 struct
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42 {
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43 signed EMACS_INT val : INT_VALBITS;
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44 unsigned int bits : INT_GCBITS;
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45 } s;
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46
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47 struct
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48 {
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49 EMACS_UINT val : INT_VALBITS;
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50 unsigned int bits : INT_GCBITS;
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51 } u;
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52 #else /* non-valbits are at higher addresses */
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53 struct
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54 {
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55 enum_field (Lisp_Type) type : GCTYPEBITS;
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56 EMACS_UINT val : VALBITS;
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57 } gu;
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58
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59 struct
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60 {
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61 unsigned int bits : INT_GCBITS;
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62 signed EMACS_INT val : INT_VALBITS;
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63 } s;
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64
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65 struct
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66 {
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67 unsigned int bits : INT_GCBITS;
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68 EMACS_UINT val : INT_VALBITS;
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69 } u;
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70
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71 #endif /* non-valbits are at higher addresses */
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72
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73 EMACS_UINT ui;
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74 signed EMACS_INT i;
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75
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76 /* This was formerly declared 'void *v' etc. but that causes
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77 GCC to accept any (yes, any) pointer as the argument of
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78 a function declared to accept a Lisp_Object. */
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79 struct nosuchstruct *v;
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80 const struct nosuchstruct *cv;
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428
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81 }
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82 Lisp_Object;
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83
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84 #define XCHARVAL(x) ((x).gu.val)
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85 # define XPNTRVAL(x) ((x).ui)
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86
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87 INLINE_HEADER Lisp_Object make_int (EMACS_INT val);
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88 INLINE_HEADER Lisp_Object
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89 make_int (EMACS_INT val)
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90 {
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91 Lisp_Object obj;
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92 obj.s.bits = 1;
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93 obj.s.val = val;
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94 return obj;
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95 }
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96
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97
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98 #ifdef __cplusplus
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99
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100 #define volatile_make_int(val) make_int (val)
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101
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102 #else
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103
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104 /* Ugh, need different definition to avoid compiler complaint in
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105 unix_send_process(). Furthermore, there's no way under C++, it seems,
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106 to declare something volatile and then return it. Perhaps I'd have to
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107 assign to something else instead? But in any case, the warnings about
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108 volatile clobbering doesn't occur in C++. I bet the thing is that C++
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109 already has a built-in system for dealing with non-local exits and such,
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110 in a smart way that doesn't clobber registers, and incorporates
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111 longjmp() into that. */
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112 INLINE_HEADER Lisp_Object volatile_make_int (EMACS_INT val);
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113 INLINE_HEADER Lisp_Object
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114 volatile_make_int (EMACS_INT val)
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115 {
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116 volatile Lisp_Object obj;
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117 obj.s.bits = 1;
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118 obj.s.val = val;
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119 return obj;
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120 }
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121
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122 #endif /* __cplusplus */
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123
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124
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125 INLINE_HEADER Lisp_Object make_char (Emchar val);
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126 INLINE_HEADER Lisp_Object
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127 make_char (Emchar val)
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128 {
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129 Lisp_Object obj;
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130 obj.gu.type = Lisp_Type_Char;
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131 obj.gu.val = val;
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132 return obj;
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133 }
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134
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135 INLINE_HEADER Lisp_Object wrap_pointer_1 (const void *ptr);
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136 INLINE_HEADER Lisp_Object
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137 wrap_pointer_1 (const void *ptr)
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138 {
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139 Lisp_Object obj;
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140 obj.ui = (EMACS_UINT) ptr;
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141 return obj;
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142 }
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143
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144 extern Lisp_Object Qnull_pointer, Qzero;
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145
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146 #define XREALINT(x) ((x).s.val)
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147 #define XUINT(x) ((x).u.val)
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148 #define XTYPE(x) ((x).gu.type)
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149 #define EQ(x,y) ((x).v == (y).v)
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150
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151 #define INTP(x) ((x).s.bits)
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152 #define INT_PLUS(x,y) make_int (XINT (x) + XINT (y))
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153 #define INT_MINUS(x,y) make_int (XINT (x) - XINT (y))
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154 #define INT_PLUS1(x) make_int (XINT (x) + 1)
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155 #define INT_MINUS1(x) make_int (XINT (x) - 1)
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156
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157 /* Convert between a (void *) and a Lisp_Object, as when the
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158 Lisp_Object is passed to a toolkit callback function */
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159 #define VOID_TO_LISP(larg,varg) \
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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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442
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162 ((void) ((larg).cv = (const struct nosuchstruct *) (varg)))
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428
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163 #define LISP_TO_VOID(larg) ((void *) ((larg).v))
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442
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164 #define LISP_TO_CVOID(larg) ((const void *) ((larg).cv))
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428
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165
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166 /* Convert a Lisp_Object into something that can't be used as an
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167 lvalue. Useful for type-checking. */
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168 #if (__GNUC__ > 1)
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169 #define NON_LVALUE(larg) ({ (larg); })
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170 #else
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171 /* Well, you can't really do it without using a function call, and
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172 there's no real point in that; no-union-type is the rule, and that
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173 will catch errors. */
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174 #define NON_LVALUE(larg) (larg)
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175 #endif
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