| 1 | /* Copyright (C) 1996,1997,1998,1999,2000,2001, 2003, 2004, 2006, 2007, |
| 2 | * 2008, 2009, 2010, 2011, 2012, 2013, 2015 Free Software Foundation, Inc. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public License |
| 6 | * as published by the Free Software Foundation; either version 3 of |
| 7 | * the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 17 | * 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | \f |
| 21 | #ifdef HAVE_CONFIG_H |
| 22 | # include <config.h> |
| 23 | #endif |
| 24 | |
| 25 | #include <alloca.h> |
| 26 | #include <assert.h> |
| 27 | |
| 28 | #define SCM_BUILDING_DEPRECATED_CODE |
| 29 | |
| 30 | #include "libguile/_scm.h" |
| 31 | #include "libguile/async.h" |
| 32 | #include "libguile/chars.h" |
| 33 | #include "libguile/eval.h" |
| 34 | #include "libguile/alist.h" |
| 35 | #include "libguile/hashtab.h" |
| 36 | #include "libguile/ports.h" |
| 37 | #include "libguile/strings.h" |
| 38 | #include "libguile/srfi-13.h" |
| 39 | |
| 40 | #include "libguile/validate.h" |
| 41 | #include "libguile/struct.h" |
| 42 | |
| 43 | #include "libguile/eq.h" |
| 44 | |
| 45 | #ifdef HAVE_STRING_H |
| 46 | #include <string.h> |
| 47 | #endif |
| 48 | |
| 49 | #include "libguile/bdw-gc.h" |
| 50 | |
| 51 | \f |
| 52 | |
| 53 | /* A needlessly obscure test. */ |
| 54 | #define SCM_LAYOUT_TAILP(X) (((X) & 32) == 0) /* R, W or O */ |
| 55 | |
| 56 | static SCM required_vtable_fields = SCM_BOOL_F; |
| 57 | static SCM required_applicable_fields = SCM_BOOL_F; |
| 58 | static SCM required_applicable_with_setter_fields = SCM_BOOL_F; |
| 59 | SCM scm_applicable_struct_vtable_vtable; |
| 60 | SCM scm_applicable_struct_with_setter_vtable_vtable; |
| 61 | SCM scm_standard_vtable_vtable; |
| 62 | |
| 63 | |
| 64 | \f |
| 65 | SCM_DEFINE (scm_make_struct_layout, "make-struct-layout", 1, 0, 0, |
| 66 | (SCM fields), |
| 67 | "Return a new structure layout object.\n\n" |
| 68 | "@var{fields} must be a string made up of pairs of characters\n" |
| 69 | "strung together. The first character of each pair describes a field\n" |
| 70 | "type, the second a field protection. Allowed types are 'p' for\n" |
| 71 | "GC-protected Scheme data, 'u' for unprotected binary data, and 's' for\n" |
| 72 | "a field that points to the structure itself. Allowed protections\n" |
| 73 | "are 'w' for mutable fields, 'h' for hidden fields, 'r' for read-only\n" |
| 74 | "fields, and 'o' for opaque fields.\n\n" |
| 75 | "Hidden fields are writable, but they will not consume an initializer arg\n" |
| 76 | "passed to @code{make-struct}. They are useful to add slots to a struct\n" |
| 77 | "in a way that preserves backward-compatibility with existing calls to\n" |
| 78 | "@code{make-struct}, especially for derived vtables.\n\n" |
| 79 | "The last field protection specification may be capitalized to indicate\n" |
| 80 | "that the field is a tail-array.") |
| 81 | #define FUNC_NAME s_scm_make_struct_layout |
| 82 | { |
| 83 | SCM new_sym; |
| 84 | scm_t_wchar c; |
| 85 | |
| 86 | SCM_VALIDATE_STRING (1, fields); |
| 87 | |
| 88 | { /* scope */ |
| 89 | size_t len; |
| 90 | int x; |
| 91 | |
| 92 | len = scm_i_string_length (fields); |
| 93 | if (len % 2 == 1) |
| 94 | SCM_MISC_ERROR ("odd length field specification: ~S", |
| 95 | scm_list_1 (fields)); |
| 96 | |
| 97 | for (x = 0; x < len; x += 2) |
| 98 | { |
| 99 | switch (c = scm_i_string_ref (fields, x)) |
| 100 | { |
| 101 | case 'u': |
| 102 | case 'p': |
| 103 | #if 0 |
| 104 | case 'i': |
| 105 | case 'd': |
| 106 | #endif |
| 107 | case 's': |
| 108 | break; |
| 109 | default: |
| 110 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
| 111 | scm_list_1 (SCM_MAKE_CHAR (c))); |
| 112 | } |
| 113 | |
| 114 | switch (c = scm_i_string_ref (fields, x + 1)) |
| 115 | { |
| 116 | case 'w': |
| 117 | case 'h': |
| 118 | if (scm_i_string_ref (fields, x) == 's') |
| 119 | SCM_MISC_ERROR ("self fields not writable", SCM_EOL); |
| 120 | case 'r': |
| 121 | case 'o': |
| 122 | break; |
| 123 | case 'R': |
| 124 | case 'W': |
| 125 | case 'O': |
| 126 | if (scm_i_string_ref (fields, x) == 's') |
| 127 | SCM_MISC_ERROR ("self fields not allowed in tail array", |
| 128 | SCM_EOL); |
| 129 | if (x != len - 2) |
| 130 | SCM_MISC_ERROR ("tail array field must be last field in layout", |
| 131 | SCM_EOL); |
| 132 | break; |
| 133 | default: |
| 134 | SCM_MISC_ERROR ("unrecognized ref specification: ~S", |
| 135 | scm_list_1 (SCM_MAKE_CHAR (c))); |
| 136 | } |
| 137 | #if 0 |
| 138 | if (scm_i_string_ref (fields, x, 'd')) |
| 139 | { |
| 140 | if (!scm_i_string_ref (fields, x+2, '-')) |
| 141 | SCM_MISC_ERROR ("missing dash field at position ~A", |
| 142 | scm_list_1 (scm_from_int (x / 2))); |
| 143 | x += 2; |
| 144 | goto recheck_ref; |
| 145 | } |
| 146 | #endif |
| 147 | } |
| 148 | new_sym = scm_string_to_symbol (fields); |
| 149 | } |
| 150 | scm_remember_upto_here_1 (fields); |
| 151 | return new_sym; |
| 152 | } |
| 153 | #undef FUNC_NAME |
| 154 | |
| 155 | \f |
| 156 | /* Check whether VTABLE instances have a simple layout (i.e., either |
| 157 | only "pr" or only "pw" fields and no tail array) and update its flags |
| 158 | accordingly. */ |
| 159 | static void |
| 160 | set_vtable_layout_flags (SCM vtable) |
| 161 | { |
| 162 | size_t len, field; |
| 163 | SCM layout; |
| 164 | const char *c_layout; |
| 165 | scm_t_bits flags = SCM_VTABLE_FLAG_SIMPLE; |
| 166 | |
| 167 | layout = SCM_VTABLE_LAYOUT (vtable); |
| 168 | c_layout = scm_i_symbol_chars (layout); |
| 169 | len = scm_i_symbol_length (layout); |
| 170 | |
| 171 | assert (len % 2 == 0); |
| 172 | |
| 173 | /* Update FLAGS according to LAYOUT. */ |
| 174 | for (field = 0; |
| 175 | field < len && flags & SCM_VTABLE_FLAG_SIMPLE; |
| 176 | field += 2) |
| 177 | { |
| 178 | if (c_layout[field] != 'p') |
| 179 | flags = 0; |
| 180 | else |
| 181 | switch (c_layout[field + 1]) |
| 182 | { |
| 183 | case 'w': |
| 184 | if (field == 0) |
| 185 | flags |= SCM_VTABLE_FLAG_SIMPLE_RW; |
| 186 | break; |
| 187 | |
| 188 | case 'r': |
| 189 | flags &= ~SCM_VTABLE_FLAG_SIMPLE_RW; |
| 190 | break; |
| 191 | |
| 192 | default: |
| 193 | flags = 0; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | if (flags & SCM_VTABLE_FLAG_SIMPLE) |
| 198 | { |
| 199 | /* VTABLE is simple so update its flags and record the size of its |
| 200 | instances. */ |
| 201 | SCM_SET_VTABLE_FLAGS (vtable, flags); |
| 202 | SCM_STRUCT_DATA_SET (vtable, scm_vtable_index_size, len / 2); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | static int |
| 207 | scm_is_valid_vtable_layout (SCM layout) |
| 208 | { |
| 209 | size_t len, n; |
| 210 | const char *c_layout; |
| 211 | |
| 212 | c_layout = scm_i_symbol_chars (layout); |
| 213 | len = scm_i_symbol_length (layout); |
| 214 | |
| 215 | if (len % 2) |
| 216 | return 0; |
| 217 | |
| 218 | for (n = 0; n < len; n += 2) |
| 219 | switch (c_layout[n]) |
| 220 | { |
| 221 | case 'u': |
| 222 | case 'p': |
| 223 | case 's': |
| 224 | switch (c_layout[n+1]) |
| 225 | { |
| 226 | case 'W': |
| 227 | case 'R': |
| 228 | case 'O': |
| 229 | if (n + 2 != len) |
| 230 | return 0; |
| 231 | case 'w': |
| 232 | case 'h': |
| 233 | case 'r': |
| 234 | case 'o': |
| 235 | break; |
| 236 | default: |
| 237 | return 0; |
| 238 | } |
| 239 | break; |
| 240 | default: |
| 241 | return 0; |
| 242 | } |
| 243 | return 1; |
| 244 | } |
| 245 | |
| 246 | /* Have OBJ, a newly created vtable, inherit flags from VTABLE. VTABLE is a |
| 247 | vtable-vtable and OBJ is an instance of VTABLE. */ |
| 248 | void |
| 249 | scm_i_struct_inherit_vtable_magic (SCM vtable, SCM obj) |
| 250 | #define FUNC_NAME "%inherit-vtable-magic" |
| 251 | { |
| 252 | /* Verily, what is the deal here, you ask? Basically, we need to know a couple |
| 253 | of properties of structures at runtime. For example, "is this structure a |
| 254 | vtable of vtables (a metaclass)?"; also, "is this structure applicable?". |
| 255 | Both of these questions also imply a certain layout of the structure. So |
| 256 | instead of checking the layout at runtime, what we do is pre-verify the |
| 257 | layout -- so that at runtime we can just check the applicable flag and |
| 258 | dispatch directly to the Scheme procedure in slot 0. */ |
| 259 | SCM olayout; |
| 260 | |
| 261 | /* Verify that OBJ is a valid vtable. */ |
| 262 | if (! scm_is_valid_vtable_layout (SCM_VTABLE_LAYOUT (obj))) |
| 263 | SCM_MISC_ERROR ("invalid layout for new vtable: ~a", |
| 264 | scm_list_1 (SCM_VTABLE_LAYOUT (obj))); |
| 265 | |
| 266 | set_vtable_layout_flags (obj); |
| 267 | |
| 268 | /* If OBJ's vtable is compatible with the required vtable (class) layout, it |
| 269 | is a metaclass. */ |
| 270 | olayout = scm_symbol_to_string (SCM_VTABLE_LAYOUT (obj)); |
| 271 | if (scm_is_true (scm_leq_p (scm_string_length (required_vtable_fields), |
| 272 | scm_string_length (olayout))) |
| 273 | && scm_is_true (scm_string_eq (olayout, required_vtable_fields, |
| 274 | scm_from_size_t (0), |
| 275 | scm_string_length (required_vtable_fields), |
| 276 | scm_from_size_t (0), |
| 277 | scm_string_length (required_vtable_fields)))) |
| 278 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VTABLE); |
| 279 | |
| 280 | /* Finally, if OBJ is an applicable class, verify that its vtable is |
| 281 | compatible with the required applicable layout. */ |
| 282 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SETTER_VTABLE)) |
| 283 | { |
| 284 | if (scm_is_false (scm_string_eq (olayout, required_applicable_with_setter_fields, |
| 285 | scm_from_size_t (0), |
| 286 | scm_from_size_t (4), |
| 287 | scm_from_size_t (0), |
| 288 | scm_from_size_t (4)))) |
| 289 | SCM_MISC_ERROR ("invalid applicable-with-setter struct layout", |
| 290 | scm_list_1 (olayout)); |
| 291 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE | SCM_VTABLE_FLAG_SETTER); |
| 292 | } |
| 293 | else if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_APPLICABLE_VTABLE)) |
| 294 | { |
| 295 | if (scm_is_false (scm_string_eq (olayout, required_applicable_fields, |
| 296 | scm_from_size_t (0), |
| 297 | scm_from_size_t (2), |
| 298 | scm_from_size_t (0), |
| 299 | scm_from_size_t (2)))) |
| 300 | SCM_MISC_ERROR ("invalid applicable struct layout", |
| 301 | scm_list_1 (olayout)); |
| 302 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_APPLICABLE); |
| 303 | } |
| 304 | |
| 305 | SCM_SET_VTABLE_FLAGS (obj, SCM_VTABLE_FLAG_VALIDATED); |
| 306 | } |
| 307 | #undef FUNC_NAME |
| 308 | |
| 309 | |
| 310 | static void |
| 311 | scm_struct_init (SCM handle, SCM layout, size_t n_tail, |
| 312 | size_t n_inits, scm_t_bits *inits) |
| 313 | { |
| 314 | SCM vtable; |
| 315 | scm_t_bits *mem; |
| 316 | |
| 317 | vtable = SCM_STRUCT_VTABLE (handle); |
| 318 | mem = SCM_STRUCT_DATA (handle); |
| 319 | |
| 320 | if (SCM_UNPACK (vtable) != 0 |
| 321 | && SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE) |
| 322 | && n_tail == 0 |
| 323 | && n_inits == SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size)) |
| 324 | /* The fast path: HANDLE has N_INITS "p" fields. */ |
| 325 | memcpy (mem, inits, n_inits * sizeof (SCM)); |
| 326 | else |
| 327 | { |
| 328 | scm_t_wchar prot = 0; |
| 329 | int n_fields = scm_i_symbol_length (layout) / 2; |
| 330 | int tailp = 0; |
| 331 | int i; |
| 332 | size_t inits_idx = 0; |
| 333 | |
| 334 | i = -2; |
| 335 | while (n_fields) |
| 336 | { |
| 337 | if (!tailp) |
| 338 | { |
| 339 | i += 2; |
| 340 | prot = scm_i_symbol_ref (layout, i+1); |
| 341 | if (SCM_LAYOUT_TAILP (prot)) |
| 342 | { |
| 343 | tailp = 1; |
| 344 | prot = prot == 'R' ? 'r' : prot == 'W' ? 'w' : 'o'; |
| 345 | *mem++ = (scm_t_bits)n_tail; |
| 346 | n_fields += n_tail - 1; |
| 347 | if (n_fields == 0) |
| 348 | break; |
| 349 | } |
| 350 | } |
| 351 | switch (scm_i_symbol_ref (layout, i)) |
| 352 | { |
| 353 | case 'u': |
| 354 | if ((prot != 'r' && prot != 'w') || inits_idx == n_inits) |
| 355 | *mem = 0; |
| 356 | else |
| 357 | { |
| 358 | *mem = scm_to_ulong (SCM_PACK (inits[inits_idx])); |
| 359 | inits_idx++; |
| 360 | } |
| 361 | break; |
| 362 | |
| 363 | case 'p': |
| 364 | if ((prot != 'r' && prot != 'w') || inits_idx == n_inits) |
| 365 | *mem = SCM_UNPACK (SCM_BOOL_F); |
| 366 | else |
| 367 | { |
| 368 | *mem = inits[inits_idx]; |
| 369 | inits_idx++; |
| 370 | } |
| 371 | |
| 372 | break; |
| 373 | |
| 374 | case 's': |
| 375 | *mem = SCM_UNPACK (handle); |
| 376 | break; |
| 377 | } |
| 378 | |
| 379 | n_fields--; |
| 380 | mem++; |
| 381 | } |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | |
| 386 | SCM_DEFINE (scm_struct_p, "struct?", 1, 0, 0, |
| 387 | (SCM x), |
| 388 | "Return @code{#t} iff @var{x} is a structure object, else\n" |
| 389 | "@code{#f}.") |
| 390 | #define FUNC_NAME s_scm_struct_p |
| 391 | { |
| 392 | return scm_from_bool(SCM_STRUCTP (x)); |
| 393 | } |
| 394 | #undef FUNC_NAME |
| 395 | |
| 396 | SCM_DEFINE (scm_struct_vtable_p, "struct-vtable?", 1, 0, 0, |
| 397 | (SCM x), |
| 398 | "Return @code{#t} iff @var{x} is a vtable structure.") |
| 399 | #define FUNC_NAME s_scm_struct_vtable_p |
| 400 | { |
| 401 | if (!SCM_STRUCTP (x) |
| 402 | || !SCM_STRUCT_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VTABLE)) |
| 403 | return SCM_BOOL_F; |
| 404 | if (!SCM_VTABLE_FLAG_IS_SET (x, SCM_VTABLE_FLAG_VALIDATED)) |
| 405 | SCM_MISC_ERROR ("vtable has invalid layout: ~A", |
| 406 | scm_list_1 (SCM_VTABLE_LAYOUT (x))); |
| 407 | return SCM_BOOL_T; |
| 408 | } |
| 409 | #undef FUNC_NAME |
| 410 | |
| 411 | |
| 412 | /* Finalization: invoke the finalizer of the struct pointed to by PTR. */ |
| 413 | static void |
| 414 | struct_finalizer_trampoline (void *ptr, void *unused_data) |
| 415 | { |
| 416 | SCM obj = PTR2SCM (ptr); |
| 417 | scm_t_struct_finalize finalize = SCM_STRUCT_FINALIZER (obj); |
| 418 | |
| 419 | if (finalize) |
| 420 | finalize (obj); |
| 421 | } |
| 422 | |
| 423 | /* All struct data must be allocated at an address whose bottom three |
| 424 | bits are zero. This is because the tag for a struct lives in the |
| 425 | bottom three bits of the struct's car, and the upper bits point to |
| 426 | the data of its vtable, which is a struct itself. Thus, if the |
| 427 | address of that data doesn't end in three zeros, tagging it will |
| 428 | destroy the pointer. |
| 429 | |
| 430 | I suppose we should make it clear here that, the data must be 8-byte aligned, |
| 431 | *within* the struct, and the struct itself should be 8-byte aligned. In |
| 432 | practice we ensure this because the data starts two words into a struct. |
| 433 | |
| 434 | This function allocates an 8-byte aligned block of memory, whose first word |
| 435 | points to the given vtable data, then a data pointer, then n_words of data. |
| 436 | */ |
| 437 | SCM |
| 438 | scm_i_alloc_struct (scm_t_bits *vtable_data, int n_words) |
| 439 | { |
| 440 | SCM ret; |
| 441 | |
| 442 | ret = scm_words ((scm_t_bits)vtable_data | scm_tc3_struct, n_words + 2); |
| 443 | SCM_SET_CELL_WORD_1 (ret, (scm_t_bits)SCM_CELL_OBJECT_LOC (ret, 2)); |
| 444 | |
| 445 | /* vtable_data can be null when making a vtable vtable */ |
| 446 | if (vtable_data && vtable_data[scm_vtable_index_instance_finalize]) |
| 447 | /* Register a finalizer for the newly created instance. */ |
| 448 | scm_i_set_finalizer (SCM2PTR (ret), struct_finalizer_trampoline, NULL); |
| 449 | |
| 450 | return ret; |
| 451 | } |
| 452 | |
| 453 | \f |
| 454 | SCM |
| 455 | scm_c_make_structv (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits *init) |
| 456 | #define FUNC_NAME "make-struct" |
| 457 | { |
| 458 | SCM layout; |
| 459 | size_t basic_size; |
| 460 | SCM obj; |
| 461 | |
| 462 | SCM_VALIDATE_VTABLE (1, vtable); |
| 463 | |
| 464 | layout = SCM_VTABLE_LAYOUT (vtable); |
| 465 | basic_size = scm_i_symbol_length (layout) / 2; |
| 466 | |
| 467 | if (n_tail != 0) |
| 468 | { |
| 469 | SCM layout_str, last_char; |
| 470 | |
| 471 | if (basic_size == 0) |
| 472 | { |
| 473 | bad_tail: |
| 474 | SCM_MISC_ERROR ("tail array not allowed unless layout ends R, W, or O", SCM_EOL); |
| 475 | } |
| 476 | |
| 477 | layout_str = scm_symbol_to_string (layout); |
| 478 | last_char = scm_string_ref (layout_str, |
| 479 | scm_from_size_t (2 * basic_size - 1)); |
| 480 | if (! SCM_LAYOUT_TAILP (SCM_CHAR (last_char))) |
| 481 | goto bad_tail; |
| 482 | } |
| 483 | |
| 484 | obj = scm_i_alloc_struct (SCM_STRUCT_DATA (vtable), basic_size + n_tail); |
| 485 | |
| 486 | scm_struct_init (obj, layout, n_tail, n_init, init); |
| 487 | |
| 488 | /* If we're making a vtable, validate its layout and inherit |
| 489 | flags. However we allow for separation of allocation and |
| 490 | initialization, to humor GOOPS, so only validate if the layout was |
| 491 | passed as an initarg. */ |
| 492 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE) |
| 493 | && scm_is_true (SCM_VTABLE_LAYOUT (obj))) |
| 494 | scm_i_struct_inherit_vtable_magic (vtable, obj); |
| 495 | |
| 496 | return obj; |
| 497 | } |
| 498 | #undef FUNC_NAME |
| 499 | |
| 500 | SCM |
| 501 | scm_c_make_struct (SCM vtable, size_t n_tail, size_t n_init, scm_t_bits init, ...) |
| 502 | { |
| 503 | va_list foo; |
| 504 | scm_t_bits *v; |
| 505 | size_t i; |
| 506 | |
| 507 | v = alloca (sizeof (scm_t_bits) * n_init); |
| 508 | |
| 509 | va_start (foo, init); |
| 510 | for (i = 0; i < n_init; i++) |
| 511 | { |
| 512 | v[i] = init; |
| 513 | init = va_arg (foo, scm_t_bits); |
| 514 | } |
| 515 | va_end (foo); |
| 516 | |
| 517 | return scm_c_make_structv (vtable, n_tail, n_init, v); |
| 518 | } |
| 519 | |
| 520 | SCM_DEFINE (scm_allocate_struct, "allocate-struct", 2, 0, 0, |
| 521 | (SCM vtable, SCM nfields), |
| 522 | "Allocate a new structure with space for @var{nfields} fields.\n\n" |
| 523 | "@var{vtable} must be a vtable structure (@pxref{Vtables}).\n\n" |
| 524 | "@var{nfields} must be a non-negative integer. Strictly speaking\n" |
| 525 | "@var{nfields} is redundant, as the vtable carries the size\n" |
| 526 | "for its instances. However passing it is useful as a sanity\n" |
| 527 | "check, given that one module can inline a constructor in\n" |
| 528 | "another.\n\n" |
| 529 | "Fields will be initialized with their default values.") |
| 530 | #define FUNC_NAME s_scm_allocate_struct |
| 531 | { |
| 532 | SCM ret; |
| 533 | size_t c_nfields; |
| 534 | |
| 535 | SCM_VALIDATE_VTABLE (1, vtable); |
| 536 | c_nfields = scm_to_size_t (nfields); |
| 537 | |
| 538 | SCM_ASSERT (SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size) == c_nfields, |
| 539 | nfields, 2, FUNC_NAME); |
| 540 | |
| 541 | ret = scm_i_alloc_struct (SCM_STRUCT_DATA (vtable), c_nfields); |
| 542 | |
| 543 | if (SCM_LIKELY (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE))) |
| 544 | { |
| 545 | size_t n; |
| 546 | for (n = 0; n < c_nfields; n++) |
| 547 | SCM_STRUCT_DATA_SET (ret, n, SCM_UNPACK (SCM_BOOL_F)); |
| 548 | } |
| 549 | else |
| 550 | scm_struct_init (ret, SCM_VTABLE_LAYOUT (vtable), 0, 0, NULL); |
| 551 | |
| 552 | return ret; |
| 553 | } |
| 554 | #undef FUNC_NAME |
| 555 | |
| 556 | SCM_DEFINE (scm_make_struct, "make-struct", 2, 0, 1, |
| 557 | (SCM vtable, SCM tail_array_size, SCM init), |
| 558 | "Create a new structure.\n\n" |
| 559 | "@var{vtable} must be a vtable structure (@pxref{Vtables}).\n\n" |
| 560 | "@var{tail_array_size} must be a non-negative integer. If the layout\n" |
| 561 | "specification indicated by @var{vtable} includes a tail-array,\n" |
| 562 | "this is the number of elements allocated to that array.\n\n" |
| 563 | "The @var{init1}, @dots{} are optional arguments describing how\n" |
| 564 | "successive fields of the structure should be initialized. Only fields\n" |
| 565 | "with protection 'r' or 'w' can be initialized, except for fields of\n" |
| 566 | "type 's', which are automatically initialized to point to the new\n" |
| 567 | "structure itself. Fields with protection 'o' can not be initialized by\n" |
| 568 | "Scheme programs.\n\n" |
| 569 | "If fewer optional arguments than initializable fields are supplied,\n" |
| 570 | "fields of type 'p' get default value #f while fields of type 'u' are\n" |
| 571 | "initialized to 0.") |
| 572 | #define FUNC_NAME s_scm_make_struct |
| 573 | { |
| 574 | size_t i, n_init; |
| 575 | long ilen; |
| 576 | scm_t_bits *v; |
| 577 | |
| 578 | SCM_VALIDATE_VTABLE (1, vtable); |
| 579 | ilen = scm_ilength (init); |
| 580 | if (ilen < 0) |
| 581 | SCM_MISC_ERROR ("Rest arguments do not form a proper list.", SCM_EOL); |
| 582 | |
| 583 | n_init = (size_t)ilen; |
| 584 | |
| 585 | /* best to use alloca, but init could be big, so hack to avoid a possible |
| 586 | stack overflow */ |
| 587 | if (n_init < 64) |
| 588 | v = alloca (n_init * sizeof(scm_t_bits)); |
| 589 | else |
| 590 | v = scm_gc_malloc (n_init * sizeof(scm_t_bits), "struct"); |
| 591 | |
| 592 | for (i = 0; i < n_init; i++, init = SCM_CDR (init)) |
| 593 | v[i] = SCM_UNPACK (SCM_CAR (init)); |
| 594 | |
| 595 | return scm_c_make_structv (vtable, scm_to_size_t (tail_array_size), n_init, v); |
| 596 | } |
| 597 | #undef FUNC_NAME |
| 598 | |
| 599 | SCM |
| 600 | scm_i_make_vtable_vtable (SCM fields) |
| 601 | #define FUNC_NAME "make-vtable-vtable" |
| 602 | { |
| 603 | SCM layout, obj; |
| 604 | size_t basic_size; |
| 605 | scm_t_bits v; |
| 606 | |
| 607 | SCM_VALIDATE_STRING (1, fields); |
| 608 | |
| 609 | layout = scm_make_struct_layout (fields); |
| 610 | if (!scm_is_valid_vtable_layout (layout)) |
| 611 | SCM_MISC_ERROR ("invalid user fields", scm_list_1 (fields)); |
| 612 | |
| 613 | basic_size = scm_i_symbol_length (layout) / 2; |
| 614 | |
| 615 | obj = scm_i_alloc_struct (NULL, basic_size); |
| 616 | /* Make it so that the vtable of OBJ is itself. */ |
| 617 | SCM_SET_CELL_WORD_0 (obj, (scm_t_bits) SCM_STRUCT_DATA (obj) | scm_tc3_struct); |
| 618 | |
| 619 | v = SCM_UNPACK (layout); |
| 620 | scm_struct_init (obj, layout, 0, 1, &v); |
| 621 | SCM_SET_VTABLE_FLAGS (obj, |
| 622 | SCM_VTABLE_FLAG_VTABLE | SCM_VTABLE_FLAG_VALIDATED); |
| 623 | |
| 624 | return obj; |
| 625 | } |
| 626 | #undef FUNC_NAME |
| 627 | |
| 628 | SCM_DEFINE (scm_make_vtable, "make-vtable", 1, 1, 0, |
| 629 | (SCM fields, SCM printer), |
| 630 | "Create a vtable, for creating structures with the given\n" |
| 631 | "@var{fields}.\n" |
| 632 | "\n" |
| 633 | "The optional @var{printer} argument is a function to be called\n" |
| 634 | "@code{(@var{printer} struct port)} on the structures created.\n" |
| 635 | "It should look at @var{struct} and write to @var{port}.") |
| 636 | #define FUNC_NAME s_scm_make_vtable |
| 637 | { |
| 638 | if (SCM_UNBNDP (printer)) |
| 639 | printer = SCM_BOOL_F; |
| 640 | |
| 641 | return scm_make_struct (scm_standard_vtable_vtable, SCM_INUM0, |
| 642 | scm_list_2 (scm_make_struct_layout (fields), |
| 643 | printer)); |
| 644 | } |
| 645 | #undef FUNC_NAME |
| 646 | |
| 647 | |
| 648 | /* Return true if S1 and S2 are equal structures, i.e., if their vtable and |
| 649 | contents are the same. Field protections are honored. Thus, it is an |
| 650 | error to test the equality of structures that contain opaque fields. */ |
| 651 | SCM |
| 652 | scm_i_struct_equalp (SCM s1, SCM s2) |
| 653 | #define FUNC_NAME "scm_i_struct_equalp" |
| 654 | { |
| 655 | SCM vtable1, vtable2, layout; |
| 656 | size_t struct_size, field_num; |
| 657 | |
| 658 | SCM_VALIDATE_STRUCT (1, s1); |
| 659 | SCM_VALIDATE_STRUCT (2, s2); |
| 660 | |
| 661 | vtable1 = SCM_STRUCT_VTABLE (s1); |
| 662 | vtable2 = SCM_STRUCT_VTABLE (s2); |
| 663 | |
| 664 | if (!scm_is_eq (vtable1, vtable2)) |
| 665 | return SCM_BOOL_F; |
| 666 | |
| 667 | layout = SCM_STRUCT_LAYOUT (s1); |
| 668 | struct_size = scm_i_symbol_length (layout) / 2; |
| 669 | |
| 670 | for (field_num = 0; field_num < struct_size; field_num++) |
| 671 | { |
| 672 | SCM s_field_num; |
| 673 | SCM field1, field2; |
| 674 | |
| 675 | /* We have to use `scm_struct_ref ()' here so that fields are accessed |
| 676 | consistently, notably wrt. field types and access rights. */ |
| 677 | s_field_num = scm_from_size_t (field_num); |
| 678 | field1 = scm_struct_ref (s1, s_field_num); |
| 679 | field2 = scm_struct_ref (s2, s_field_num); |
| 680 | |
| 681 | /* Self-referencing fields (type `s') must be skipped to avoid infinite |
| 682 | recursion. */ |
| 683 | if (!(scm_is_eq (field1, s1) && (scm_is_eq (field2, s2)))) |
| 684 | if (scm_is_false (scm_equal_p (field1, field2))) |
| 685 | return SCM_BOOL_F; |
| 686 | } |
| 687 | |
| 688 | /* FIXME: Tail elements should be tested for equality. */ |
| 689 | |
| 690 | return SCM_BOOL_T; |
| 691 | } |
| 692 | #undef FUNC_NAME |
| 693 | |
| 694 | |
| 695 | \f |
| 696 | |
| 697 | |
| 698 | SCM_DEFINE (scm_struct_ref, "struct-ref", 2, 0, 0, |
| 699 | (SCM handle, SCM pos), |
| 700 | "Access the @var{pos}th field of struct associated with\n" |
| 701 | "@var{handle}.\n" |
| 702 | "\n" |
| 703 | "If the field is of type 'p', then it can be set to an arbitrary\n" |
| 704 | "value.\n" |
| 705 | "\n" |
| 706 | "If the field is of type 'u', then it can only be set to a\n" |
| 707 | "non-negative integer value small enough to fit in one machine\n" |
| 708 | "word.") |
| 709 | #define FUNC_NAME s_scm_struct_ref |
| 710 | { |
| 711 | SCM vtable, answer = SCM_UNDEFINED; |
| 712 | scm_t_bits *data; |
| 713 | size_t p; |
| 714 | |
| 715 | SCM_VALIDATE_STRUCT (1, handle); |
| 716 | |
| 717 | vtable = SCM_STRUCT_VTABLE (handle); |
| 718 | data = SCM_STRUCT_DATA (handle); |
| 719 | p = scm_to_size_t (pos); |
| 720 | |
| 721 | if (SCM_LIKELY (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE) |
| 722 | && p < SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size))) |
| 723 | /* The fast path: HANDLE is a struct with only "p" fields. */ |
| 724 | answer = SCM_PACK (data[p]); |
| 725 | else |
| 726 | { |
| 727 | SCM layout; |
| 728 | size_t layout_len, n_fields; |
| 729 | scm_t_wchar field_type = 0; |
| 730 | |
| 731 | layout = SCM_STRUCT_LAYOUT (handle); |
| 732 | layout_len = scm_i_symbol_length (layout); |
| 733 | n_fields = layout_len / 2; |
| 734 | |
| 735 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) |
| 736 | n_fields += data[n_fields - 1]; |
| 737 | |
| 738 | SCM_ASSERT_RANGE (1, pos, p < n_fields); |
| 739 | |
| 740 | if (p * 2 < layout_len) |
| 741 | { |
| 742 | scm_t_wchar ref; |
| 743 | field_type = scm_i_symbol_ref (layout, p * 2); |
| 744 | ref = scm_i_symbol_ref (layout, p * 2 + 1); |
| 745 | if ((ref != 'r') && (ref != 'w') && (ref != 'h')) |
| 746 | { |
| 747 | if ((ref == 'R') || (ref == 'W')) |
| 748 | field_type = 'u'; |
| 749 | else |
| 750 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
| 751 | } |
| 752 | } |
| 753 | else if (scm_i_symbol_ref (layout, layout_len - 1) != 'O') |
| 754 | field_type = scm_i_symbol_ref(layout, layout_len - 2); |
| 755 | else |
| 756 | SCM_MISC_ERROR ("ref denied for field ~A", scm_list_1 (pos)); |
| 757 | |
| 758 | switch (field_type) |
| 759 | { |
| 760 | case 'u': |
| 761 | answer = scm_from_ulong (data[p]); |
| 762 | break; |
| 763 | |
| 764 | #if 0 |
| 765 | case 'i': |
| 766 | answer = scm_from_long (data[p]); |
| 767 | break; |
| 768 | |
| 769 | case 'd': |
| 770 | answer = scm_make_real (*((double *)&(data[p]))); |
| 771 | break; |
| 772 | #endif |
| 773 | |
| 774 | case 's': |
| 775 | case 'p': |
| 776 | answer = SCM_PACK (data[p]); |
| 777 | break; |
| 778 | |
| 779 | |
| 780 | default: |
| 781 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
| 782 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | return answer; |
| 787 | } |
| 788 | #undef FUNC_NAME |
| 789 | |
| 790 | |
| 791 | SCM_DEFINE (scm_struct_set_x, "struct-set!", 3, 0, 0, |
| 792 | (SCM handle, SCM pos, SCM val), |
| 793 | "Set the slot of the structure @var{handle} with index @var{pos}\n" |
| 794 | "to @var{val}. Signal an error if the slot can not be written\n" |
| 795 | "to.") |
| 796 | #define FUNC_NAME s_scm_struct_set_x |
| 797 | { |
| 798 | SCM vtable; |
| 799 | scm_t_bits *data; |
| 800 | size_t p; |
| 801 | |
| 802 | SCM_VALIDATE_STRUCT (1, handle); |
| 803 | |
| 804 | vtable = SCM_STRUCT_VTABLE (handle); |
| 805 | data = SCM_STRUCT_DATA (handle); |
| 806 | p = scm_to_size_t (pos); |
| 807 | |
| 808 | if (SCM_LIKELY (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE) |
| 809 | && SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_SIMPLE_RW) |
| 810 | && p < SCM_STRUCT_DATA_REF (vtable, scm_vtable_index_size))) |
| 811 | /* The fast path: HANDLE is a struct with only "pw" fields. */ |
| 812 | data[p] = SCM_UNPACK (val); |
| 813 | else |
| 814 | { |
| 815 | SCM layout; |
| 816 | size_t layout_len, n_fields; |
| 817 | scm_t_wchar field_type = 0; |
| 818 | |
| 819 | layout = SCM_STRUCT_LAYOUT (handle); |
| 820 | layout_len = scm_i_symbol_length (layout); |
| 821 | n_fields = layout_len / 2; |
| 822 | |
| 823 | if (SCM_LAYOUT_TAILP (scm_i_symbol_ref (layout, layout_len - 1))) |
| 824 | n_fields += data[n_fields - 1]; |
| 825 | |
| 826 | SCM_ASSERT_RANGE (1, pos, p < n_fields); |
| 827 | |
| 828 | if (p * 2 < layout_len) |
| 829 | { |
| 830 | char set_x; |
| 831 | field_type = scm_i_symbol_ref (layout, p * 2); |
| 832 | set_x = scm_i_symbol_ref (layout, p * 2 + 1); |
| 833 | if (set_x != 'w' && set_x != 'h') |
| 834 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
| 835 | } |
| 836 | else if (scm_i_symbol_ref (layout, layout_len - 1) == 'W') |
| 837 | field_type = scm_i_symbol_ref (layout, layout_len - 2); |
| 838 | else |
| 839 | SCM_MISC_ERROR ("set! denied for field ~A", scm_list_1 (pos)); |
| 840 | |
| 841 | switch (field_type) |
| 842 | { |
| 843 | case 'u': |
| 844 | data[p] = SCM_NUM2ULONG (3, val); |
| 845 | break; |
| 846 | |
| 847 | #if 0 |
| 848 | case 'i': |
| 849 | data[p] = SCM_NUM2LONG (3, val); |
| 850 | break; |
| 851 | |
| 852 | case 'd': |
| 853 | *((double *)&(data[p])) = scm_num2dbl (val, (char *)SCM_ARG3); |
| 854 | break; |
| 855 | #endif |
| 856 | |
| 857 | case 'p': |
| 858 | data[p] = SCM_UNPACK (val); |
| 859 | break; |
| 860 | |
| 861 | case 's': |
| 862 | SCM_MISC_ERROR ("self fields immutable", SCM_EOL); |
| 863 | |
| 864 | default: |
| 865 | SCM_MISC_ERROR ("unrecognized field type: ~S", |
| 866 | scm_list_1 (SCM_MAKE_CHAR (field_type))); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | return val; |
| 871 | } |
| 872 | #undef FUNC_NAME |
| 873 | |
| 874 | |
| 875 | SCM_DEFINE (scm_struct_vtable, "struct-vtable", 1, 0, 0, |
| 876 | (SCM handle), |
| 877 | "Return the vtable structure that describes the type of struct\n" |
| 878 | "associated with @var{handle}.") |
| 879 | #define FUNC_NAME s_scm_struct_vtable |
| 880 | { |
| 881 | SCM_VALIDATE_STRUCT (1, handle); |
| 882 | return SCM_STRUCT_VTABLE (handle); |
| 883 | } |
| 884 | #undef FUNC_NAME |
| 885 | |
| 886 | |
| 887 | /* {Associating names and classes with vtables} |
| 888 | * |
| 889 | * The name of a vtable should probably be stored as a slot. This is |
| 890 | * a backward compatible solution until agreement has been achieved on |
| 891 | * how to associate names with vtables. |
| 892 | */ |
| 893 | |
| 894 | unsigned long |
| 895 | scm_struct_ihashq (SCM obj, unsigned long n, void *closure) |
| 896 | { |
| 897 | /* The length of the hash table should be a relative prime it's not |
| 898 | necessary to shift down the address. */ |
| 899 | return SCM_UNPACK (obj) % n; |
| 900 | } |
| 901 | |
| 902 | SCM_DEFINE (scm_struct_vtable_name, "struct-vtable-name", 1, 0, 0, |
| 903 | (SCM vtable), |
| 904 | "Return the name of the vtable @var{vtable}.") |
| 905 | #define FUNC_NAME s_scm_struct_vtable_name |
| 906 | { |
| 907 | SCM_VALIDATE_VTABLE (1, vtable); |
| 908 | return SCM_VTABLE_NAME (vtable); |
| 909 | } |
| 910 | #undef FUNC_NAME |
| 911 | |
| 912 | SCM_DEFINE (scm_set_struct_vtable_name_x, "set-struct-vtable-name!", 2, 0, 0, |
| 913 | (SCM vtable, SCM name), |
| 914 | "Set the name of the vtable @var{vtable} to @var{name}.") |
| 915 | #define FUNC_NAME s_scm_set_struct_vtable_name_x |
| 916 | { |
| 917 | SCM_VALIDATE_VTABLE (1, vtable); |
| 918 | SCM_VALIDATE_SYMBOL (2, name); |
| 919 | SCM_SET_VTABLE_NAME (vtable, name); |
| 920 | /* FIXME: remove this, and implement proper struct classes instead. |
| 921 | (Vtables *are* classes.) */ |
| 922 | scm_i_define_class_for_vtable (vtable); |
| 923 | return SCM_UNSPECIFIED; |
| 924 | } |
| 925 | #undef FUNC_NAME |
| 926 | |
| 927 | |
| 928 | \f |
| 929 | |
| 930 | void |
| 931 | scm_print_struct (SCM exp, SCM port, scm_print_state *pstate) |
| 932 | { |
| 933 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PRINTER (exp)))) |
| 934 | scm_printer_apply (SCM_STRUCT_PRINTER (exp), exp, port, pstate); |
| 935 | else |
| 936 | { |
| 937 | SCM vtable = SCM_STRUCT_VTABLE (exp); |
| 938 | SCM name = scm_struct_vtable_name (vtable); |
| 939 | scm_puts_unlocked ("#<", port); |
| 940 | if (scm_is_true (name)) |
| 941 | { |
| 942 | scm_display (name, port); |
| 943 | scm_putc_unlocked (' ', port); |
| 944 | } |
| 945 | else |
| 946 | { |
| 947 | if (SCM_VTABLE_FLAG_IS_SET (vtable, SCM_VTABLE_FLAG_VTABLE)) |
| 948 | scm_puts_unlocked ("vtable:", port); |
| 949 | else |
| 950 | scm_puts_unlocked ("struct:", port); |
| 951 | scm_uintprint (SCM_UNPACK (vtable), 16, port); |
| 952 | scm_putc_unlocked (' ', port); |
| 953 | scm_write (SCM_VTABLE_LAYOUT (vtable), port); |
| 954 | scm_putc_unlocked (' ', port); |
| 955 | } |
| 956 | scm_uintprint (SCM_UNPACK (exp), 16, port); |
| 957 | /* hackety hack */ |
| 958 | if (SCM_STRUCT_APPLICABLE_P (exp)) |
| 959 | { |
| 960 | if (scm_is_true (SCM_STRUCT_PROCEDURE (exp))) |
| 961 | { |
| 962 | scm_puts_unlocked (" proc: ", port); |
| 963 | if (scm_is_true (scm_procedure_p (SCM_STRUCT_PROCEDURE (exp)))) |
| 964 | scm_write (SCM_STRUCT_PROCEDURE (exp), port); |
| 965 | else |
| 966 | scm_puts_unlocked ("(not a procedure?)", port); |
| 967 | } |
| 968 | if (SCM_STRUCT_SETTER_P (exp)) |
| 969 | { |
| 970 | scm_puts_unlocked (" setter: ", port); |
| 971 | scm_write (SCM_STRUCT_SETTER (exp), port); |
| 972 | } |
| 973 | } |
| 974 | scm_putc_unlocked ('>', port); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | void |
| 979 | scm_init_struct () |
| 980 | { |
| 981 | SCM name; |
| 982 | |
| 983 | /* The first word of a struct is equal to `SCM_STRUCT_DATA (vtable) + |
| 984 | scm_tc3_struct', and `SCM_STRUCT_DATA (vtable)' is 2 words after VTABLE by |
| 985 | default. */ |
| 986 | GC_REGISTER_DISPLACEMENT (2 * sizeof (scm_t_bits) + scm_tc3_struct); |
| 987 | |
| 988 | /* In the general case, `SCM_STRUCT_DATA (obj)' points 2 words after the |
| 989 | beginning of a GC-allocated region; that region is different from that of |
| 990 | OBJ once OBJ has undergone class redefinition. */ |
| 991 | GC_REGISTER_DISPLACEMENT (2 * sizeof (scm_t_bits)); |
| 992 | |
| 993 | required_vtable_fields = scm_from_locale_string (SCM_VTABLE_BASE_LAYOUT); |
| 994 | scm_c_define ("standard-vtable-fields", required_vtable_fields); |
| 995 | required_applicable_fields = scm_from_locale_string (SCM_APPLICABLE_BASE_LAYOUT); |
| 996 | required_applicable_with_setter_fields = scm_from_locale_string (SCM_APPLICABLE_WITH_SETTER_BASE_LAYOUT); |
| 997 | |
| 998 | scm_standard_vtable_vtable = |
| 999 | scm_i_make_vtable_vtable (required_vtable_fields); |
| 1000 | name = scm_from_utf8_symbol ("<standard-vtable>"); |
| 1001 | scm_set_struct_vtable_name_x (scm_standard_vtable_vtable, name); |
| 1002 | scm_define (name, scm_standard_vtable_vtable); |
| 1003 | |
| 1004 | scm_applicable_struct_vtable_vtable = |
| 1005 | scm_make_struct (scm_standard_vtable_vtable, SCM_INUM0, |
| 1006 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); |
| 1007 | name = scm_from_utf8_symbol ("<applicable-struct-vtable>"); |
| 1008 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_vtable_vtable, |
| 1009 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE); |
| 1010 | scm_set_struct_vtable_name_x (scm_applicable_struct_vtable_vtable, name); |
| 1011 | scm_define (name, scm_applicable_struct_vtable_vtable); |
| 1012 | |
| 1013 | scm_applicable_struct_with_setter_vtable_vtable = |
| 1014 | scm_make_struct (scm_standard_vtable_vtable, SCM_INUM0, |
| 1015 | scm_list_1 (scm_make_struct_layout (required_vtable_fields))); |
| 1016 | name = scm_from_utf8_symbol ("<applicable-struct-with-setter-vtable>"); |
| 1017 | scm_set_struct_vtable_name_x (scm_applicable_struct_with_setter_vtable_vtable, name); |
| 1018 | SCM_SET_VTABLE_FLAGS (scm_applicable_struct_with_setter_vtable_vtable, |
| 1019 | SCM_VTABLE_FLAG_APPLICABLE_VTABLE | SCM_VTABLE_FLAG_SETTER_VTABLE); |
| 1020 | scm_define (name, scm_applicable_struct_with_setter_vtable_vtable); |
| 1021 | |
| 1022 | scm_c_define ("vtable-index-layout", scm_from_int (scm_vtable_index_layout)); |
| 1023 | scm_c_define ("vtable-index-printer", |
| 1024 | scm_from_int (scm_vtable_index_instance_printer)); |
| 1025 | scm_c_define ("vtable-offset-user", scm_from_int (scm_vtable_offset_user)); |
| 1026 | #include "libguile/struct.x" |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | Local Variables: |
| 1031 | c-file-style: "gnu" |
| 1032 | End: |
| 1033 | */ |