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1 /* The "lrecord" structure (header of a compound lisp object).
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2 Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
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3 Copyright (C) 1996 Ben Wing.
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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: Not in FSF. */
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23
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24 #ifndef _XEMACS_LRECORD_H_
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25 #define _XEMACS_LRECORD_H_
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26
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27 /* The "lrecord" type of Lisp object is used for all object types
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28 other than a few simple ones. This allows many types to be
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29 implemented but only a few bits required in a Lisp object for
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30 type information. (The tradeoff is that each object has its
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31 type marked in it, thereby increasing its size.) The first
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32 four bytes of all lrecords is a pointer to a struct
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33 lrecord_implementation, which contains methods describing
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34 how to process this object.
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35
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36 lrecords are of two types: straight lrecords, and lcrecords.
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37 Straight lrecords are used for those types of objects that
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38 have their own allocation routines (typically allocated out
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39 of 2K chunks of memory). These objects have a
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40 `struct lrecord_header' at the top, containing only the
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41 implementation pointer. There are special routines in alloc.c
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42 to deal with each such object type.
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43
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44 Lcrecords are used for less common sorts of objects that don't
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45 do their own allocation. Each such object is malloc()ed
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46 individually, and the objects are chained together through
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47 a `next' pointer. Lcrecords have a `struct lcrecord_header'
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48 at the top, which contains an implementation pointer and
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49 a `next' pointer, and are allocated using alloc_lcrecord().
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50
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51 Creating a new lcrecord type is fairly easy; just follow the
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52 lead of some existing type (e.g. hashtables). Note that you
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53 do not need to supply all the methods (see below); reasonable
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54 defaults are provided for many of them. Alternatively, if you're
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55 just looking for a way of encapsulating data (which possibly
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56 could contain Lisp_Objects in it), you may well be able to use
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57 the opaque type. */
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58
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59 struct lrecord_header
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60 {
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61 /* It would be better to put the mark-bit together with the
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62 * following datatype identification field in an 8- or 16-bit integer
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63 * rather than playing funny games with changing header->implementation
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64 * and "wasting" 32 bits on the below pointer.
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65 * The type-id would then be a 7 or 15
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66 * bit index into a table of lrecord-implementations rather than a
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67 * direct pointer. There would be 24 (or 16) bits left over for
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68 * datatype-specific per-instance flags.
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69 * The below is the simplest thing to do for the present,
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70 * and doesn't incur that much overhead as most Emacs records
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71 * are of such a size that the overhead isn't too bad.
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72 * (The marker datatype is the worst case.)
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73 * It also has the very very very slight advantage that type-checking
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74 * involves one memory read (of the "implementation" slot) and a
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75 * comparison against a link-time constant address rather than a
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76 * read and a comparison against a variable value. (Variable since
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77 * it is a very good idea to assign the indices into the hypothetical
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78 * type-code table dynamically rather that pre-defining them.)
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79 * I think I remember that Elk Lisp does something like this.
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80 * Gee, I wonder if some cretin has patented it?
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81 */
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82 CONST struct lrecord_implementation *implementation;
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83 };
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84 #define set_lheader_implementation(header,imp) (header)->implementation=(imp)
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85
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86 struct lcrecord_header
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87 {
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88 struct lrecord_header lheader;
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89 /* The "next" field is normally used to chain all lrecords together
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90 * so that the GC can find (and free) all of them.
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91 * "alloc_lcrecord" threads records together.
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92 * The "next" field may be used for other purposes as long as some
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93 * other mechanism is provided for letting the GC do its work.
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94 * (For example, the event and marker datatypes allocates members out
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95 * of memory chunks, and it are able to find all unmarked
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96 * events by sweeping through the elements of the list of chunks)
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97 */
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98 struct lcrecord_header *next;
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99 /* This is just for debugging/printing convenience.
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100 Having this slot doesn't hurt us much spacewise, since an lcrecord
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101 already has the above slots together with malloc overhead. */
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102 int uid :31;
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103 /* A flag that indicates whether this lcrecord is on a "free list".
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104 Free lists are used to minimize the number of calls to malloc()
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105 when we're repeatedly allocating and freeing a number of the
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106 same sort of lcrecord. Lcrecords on a free list always get
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107 marked in a different fashion, so we can use this flag as a
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108 sanity check to make sure that free lists only have freed lcrecords
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109 and no freed lcrecords are elsewhere. */
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110 int free :1;
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111 };
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112
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113 /* Used for lcrecords in an lcrecord-list. */
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114 struct free_lcrecord_header
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115 {
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116 struct lcrecord_header lcheader;
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117 Lisp_Object chain;
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118 };
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119
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120 /* This as the value of lheader->implementation->finalizer
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121 * means that this record is already marked */
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122 extern void this_marks_a_marked_record (void *, int);
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123
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124 /* see alloc.c for an explanation */
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125 extern Lisp_Object this_one_is_unmarkable (Lisp_Object obj,
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126 void (*markobj) (Lisp_Object));
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127
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128 struct lrecord_implementation
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129 {
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130 CONST char *name;
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131 /* This function is called at GC time, to make sure that all Lisp_Objects
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132 pointed to by this object get properly marked. It should call
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133 the mark_object function on all Lisp_Objects in the object. If
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134 the return value is non-nil, it should be a Lisp_Object to be
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135 marked (don't call the mark_object function explicitly on it,
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136 because the GC routines will do this). Doing it this way reduces
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137 recursion, so the object returned should preferably be the one
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138 with the deepest level of Lisp_Object pointers. This function
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139 can be NULL, meaning no GC marking is necessary. */
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140 Lisp_Object (*marker) (Lisp_Object, void (*mark_object) (Lisp_Object));
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141 /* This can be NULL if the object is an lcrecord; the
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142 default_object_printer() in print.c will be used. */
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143 void (*printer) (Lisp_Object, Lisp_Object printcharfun, int escapeflag);
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144 /* This function is called at GC time when the object is about to
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145 be freed, and at dump time (FOR_DISKSAVE will be non-zero in this
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146 case). It should perform any necessary cleanup (e.g. freeing
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147 malloc()ed memory. This can be NULL, meaning no special
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148 finalization is necessary.
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149
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150 WARNING: remember that the finalizer is called at dump time even
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151 though the object is not being freed. */
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152 void (*finalizer) (void *header, int for_disksave);
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153 /* This can be NULL, meaning compare objects with EQ(). */
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154 int (*equal) (Lisp_Object obj1, Lisp_Object obj2, int depth);
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155 /* This can be NULL, meaning use the Lisp_Object itself as the hash;
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156 but *only* if the `equal' function is EQ (if two objects are
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157 `equal', they *must* hash to the same value or the hashing won't
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158 work). */
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159 unsigned long (*hash) (Lisp_Object, int);
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160 Lisp_Object (*getprop) (Lisp_Object obj, Lisp_Object prop);
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161 int (*putprop) (Lisp_Object obj, Lisp_Object prop, Lisp_Object val);
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162 int (*remprop) (Lisp_Object obj, Lisp_Object prop);
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163 Lisp_Object (*plist) (Lisp_Object obj);
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164
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165 /* Only one of these is non-0. If both are 0, it means that this type
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166 is not instantiable by alloc_lcrecord(). */
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167 unsigned int static_size;
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168 unsigned int (*size_in_bytes_method) (CONST void *header);
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169 /* A unique subtag-code (dynamically) assigned to this datatype. */
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170 /* (This is a pointer so the rest of this structure can be read-only.) */
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171 int *lrecord_type_index;
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172 /* A "basic" lrecord is any lrecord that's not an lcrecord, i.e.
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173 one that does not have an lcrecord_header at the front and which
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174 is (usually) allocated in frob blocks. We only use this flag
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175 for some consistency checking, and that only when error-checking
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176 is enabled. */
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177 int basic_p;
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178 };
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179
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180 extern int gc_in_progress;
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181
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182 #define MARKED_RECORD_P(obj) (gc_in_progress && \
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183 XRECORD_LHEADER (obj)->implementation->finalizer == \
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184 this_marks_a_marked_record)
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185
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186 /* Declaring the following structures as const puts them in the
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187 text (read-only) segment, which makes debugging inconvenient
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188 because this segment is not mapped when processing a core-
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189 dump file */
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190
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191 #ifdef DEBUG_XEMACS
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192 #define CONST_IF_NOT_DEBUG
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193 #else
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194 #define CONST_IF_NOT_DEBUG CONST
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195 #endif
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196
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197 /* DEFINE_LRECORD_IMPLEMENTATION is for objects with constant size.
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198 DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION is for objects whose size varies.
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199 */
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200
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201 #if defined (ERROR_CHECK_TYPECHECK)
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202 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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203 #else
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204 # define DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype)
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205 #endif
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206
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207 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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208 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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209 static int lrecord_##c_name##_lrecord_type_index; \
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210 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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211 { { name, marker, printer, nuker, equal, hash, \
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212 0, 0, 0, 0, sizeof (structtype), 0, \
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213 &(lrecord_##c_name##_lrecord_type_index), 1 }, \
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214 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } }
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215
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216 #define DEFINE_BASIC_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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217 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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218 static int lrecord_##c_name##_lrecord_type_index; \
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219 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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220 { { name, marker, printer, nuker, equal, hash, \
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221 getprop, putprop, remprop, props, sizeof (structtype), 0, \
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222 &(lrecord_##c_name##_lrecord_type_index), 1 }, \
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223 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 } }
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224
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225 #define DEFINE_LRECORD_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,structtype) \
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226 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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227 static int lrecord_##c_name##_lrecord_type_index; \
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228 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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229 { { name, marker, printer, nuker, equal, hash, \
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230 0, 0, 0, 0, sizeof (structtype), 0, \
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231 &(lrecord_##c_name##_lrecord_type_index), 0 }, \
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232 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } }
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233
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234 #define DEFINE_LRECORD_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,structtype) \
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235 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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236 static int lrecord_##c_name##_lrecord_type_index; \
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237 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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238 { { name, marker, printer, nuker, equal, hash, \
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239 getprop, putprop, remprop, props, sizeof (structtype), 0, \
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240 &(lrecord_##c_name##_lrecord_type_index), 0 }, \
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241 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } }
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242
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243 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION(name,c_name,marker,printer,nuker,equal,hash,sizer,structtype) \
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244 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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245 static int lrecord_##c_name##_lrecord_type_index; \
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246 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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247 { { name, marker, printer, nuker, equal, hash, \
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248 0, 0, 0, 0, 0, sizer, \
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249 &(lrecord_##c_name##_lrecord_type_index), 0 }, \
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250 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } }
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251
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252 #define DEFINE_LRECORD_SEQUENCE_IMPLEMENTATION_WITH_PROPS(name,c_name,marker,printer,nuker,equal,hash,getprop,putprop,remprop,props,sizer,structtype) \
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253 DECLARE_ERROR_CHECK_TYPECHECK(c_name, structtype) \
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254 static int lrecord_##c_name##_lrecord_type_index; \
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255 CONST_IF_NOT_DEBUG struct lrecord_implementation lrecord_##c_name[2] = \
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256 { { name, marker, printer, nuker, equal, hash, \
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257 getprop, putprop, remprop, props, 0, sizer, \
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258 &(lrecord_##c_name##_lrecord_type_index), 0 }, \
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259 { 0, 0, 0, this_marks_a_marked_record, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } }
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260
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261 #define LRECORDP(a) (XTYPE ((a)) == Lisp_Record)
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262 #define XRECORD_LHEADER(a) ((struct lrecord_header *) XPNTR (a))
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263 #define RECORD_TYPEP(x, ty) \
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264 (LRECORDP (x) && XRECORD_LHEADER (x)->implementation == (ty))
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265
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266 /* NOTE: the DECLARE_LRECORD() must come before the associated
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267 DEFINE_LRECORD_*() or you will get compile errors.
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268
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269 Furthermore, you always need to put the DECLARE_LRECORD() in a header
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270 file, and make sure the header file is included in inline.c, even
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271 if the type is private to a particular file. Otherwise, you will
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272 get undefined references for the error_check_foo() inline function
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273 under GCC. */
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274
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275 #ifdef ERROR_CHECK_TYPECHECK
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276
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277 # define DECLARE_LRECORD(c_name, structtype) \
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278 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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279 lrecord_##c_name[]; \
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280 INLINE structtype *error_check_##c_name (Lisp_Object _obj); \
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281 INLINE structtype * \
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282 error_check_##c_name (Lisp_Object _obj) \
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283 { \
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284 XUNMARK (_obj); \
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285 assert (RECORD_TYPEP (_obj, lrecord_##c_name) || \
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286 MARKED_RECORD_P (_obj)); \
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287 return (structtype *) XPNTR (_obj); \
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288 } \
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289 extern Lisp_Object Q##c_name##p
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290
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291 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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292 INLINE structtype *error_check_##c_name (Lisp_Object _obj); \
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293 INLINE structtype * \
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294 error_check_##c_name (Lisp_Object _obj) \
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295 { \
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296 XUNMARK (_obj); \
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297 assert (XGCTYPE (_obj) == type_enum); \
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298 return (structtype *) XPNTR (_obj); \
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299 } \
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300 extern Lisp_Object Q##c_name##p
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301
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302 # define XRECORD(x, c_name, structtype) error_check_##c_name (x)
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303 # define XNONRECORD(x, c_name, type_enum, structtype) error_check_##c_name (x)
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304
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305 # define XSETRECORD(var, p, c_name) do \
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306 { \
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307 XSETOBJ (var, Lisp_Record, p); \
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308 assert (RECORD_TYPEP (var, lrecord_##c_name) || \
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309 MARKED_RECORD_P (var)); \
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310 } while (0)
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311
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312 #else /* not ERROR_CHECK_TYPECHECK */
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313
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314 # define DECLARE_LRECORD(c_name, structtype) \
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315 extern Lisp_Object Q##c_name##p; \
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316 extern CONST_IF_NOT_DEBUG struct lrecord_implementation \
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317 lrecord_##c_name[]
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318 # define DECLARE_NONRECORD(c_name, type_enum, structtype) \
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319 extern Lisp_Object Q##c_name##p
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320 # define XRECORD(x, c_name, structtype) ((structtype *) XPNTR (x))
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321 # define XNONRECORD(x, c_name, type_enum, structtype) \
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322 ((structtype *) XPNTR (x))
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323 # define XSETRECORD(var, p, c_name) XSETOBJ (var, Lisp_Record, p)
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324
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325 #endif /* not ERROR_CHECK_TYPECHECK */
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326
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327 #define RECORDP(x, c_name) RECORD_TYPEP (x, lrecord_##c_name)
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328 #define GC_RECORDP(x, c_name) gc_record_type_p (x, lrecord_##c_name)
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329
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330 /* Note: we now have two different kinds of type-checking macros.
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331 The "old" kind has now been renamed CONCHECK_foo. The reason for
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332 this is that the CONCHECK_foo macros signal a continuable error,
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333 allowing the user (through debug-on-error) to subsitute a different
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334 value and return from the signal, which causes the lvalue argument
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335 to get changed. Quite a lot of code would crash if that happened,
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336 because it did things like
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337
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338 foo = XCAR (list);
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339 CHECK_STRING (foo);
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340
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341 and later on did XSTRING (XCAR (list)), assuming that the type
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342 is correct (when it might be wrong, if the user substituted a
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343 correct value in the debugger).
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344
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345 To get around this, I made all the CHECK_foo macros signal a
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346 non-continuable error. Places where a continuable error is OK
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347 (generally only when called directly on the argument of a Lisp
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348 primitive) should be changed to use CONCHECK().
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349
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350 FSF Emacs does not have this problem because RMS took the cheesy
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351 way out and disabled returning from a signal entirely. */
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352
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353 #define CONCHECK_RECORD(x, c_name) do \
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354 { if (!RECORD_TYPEP (x, lrecord_##c_name)) \
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355 x = wrong_type_argument (Q##c_name##p, x); } \
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356 while (0)
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357 #define CONCHECK_NONRECORD(x, lisp_enum, predicate) do \
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358 { if (XTYPE (x) != lisp_enum) \
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359 x = wrong_type_argument (predicate, x); } \
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360 while (0)
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361 #define CHECK_RECORD(x, c_name) do \
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362 { if (!RECORD_TYPEP (x, lrecord_##c_name)) \
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363 dead_wrong_type_argument (Q##c_name##p, x); } \
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364 while (0)
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365 #define CHECK_NONRECORD(x, lisp_enum, predicate) do \
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366 { if (XTYPE (x) != lisp_enum) \
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367 dead_wrong_type_argument (predicate, x); } \
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368 while (0)
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369
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370 void *alloc_lcrecord (int size, CONST struct lrecord_implementation *);
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371
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372 int gc_record_type_p (Lisp_Object frob,
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373 CONST struct lrecord_implementation *type);
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374
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375 /* Copy the data from one lcrecord structure into another, but don't
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376 overwrite the header information. */
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377
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378 #define copy_lcrecord(dst, src) \
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379 memcpy ((char *) dst + sizeof (struct lcrecord_header), \
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380 (char *) src + sizeof (struct lcrecord_header), \
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381 sizeof (*dst) - sizeof (struct lcrecord_header))
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382
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383 #define zero_lcrecord(lcr) \
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384 memset ((char *) lcr + sizeof (struct lcrecord_header), 0, \
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385 sizeof (*lcr) - sizeof (struct lcrecord_header))
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386
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387 #endif /* _XEMACS_LRECORD_H_ */
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