libguile/__scm.h

   1 /* classes: h_files */
   2
   3 #ifndef __SCMH
   4 #define __SCMH
   5 /*      Copyright (C) 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this software; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20  * Boston, MA 02111-1307 USA
  21  *
  22  * As a special exception, the Free Software Foundation gives permission
  23  * for additional uses of the text contained in its release of GUILE.
  24  *
  25  * The exception is that, if you link the GUILE library with other files
  26  * to produce an executable, this does not by itself cause the
  27  * resulting executable to be covered by the GNU General Public License.
  28  * Your use of that executable is in no way restricted on account of
  29  * linking the GUILE library code into it.
  30  *
  31  * This exception does not however invalidate any other reasons why
  32  * the executable file might be covered by the GNU General Public License.
  33  *
  34  * This exception applies only to the code released by the
  35  * Free Software Foundation under the name GUILE.  If you copy
  36  * code from other Free Software Foundation releases into a copy of
  37  * GUILE, as the General Public License permits, the exception does
  38  * not apply to the code that you add in this way.  To avoid misleading
  39  * anyone as to the status of such modified files, you must delete
  40  * this exception notice from them.
  41  *
  42  * If you write modifications of your own for GUILE, it is your choice
  43  * whether to permit this exception to apply to your modifications.
  44  * If you do not wish that, delete this exception notice.  */
  45 \f
  46
  47 /* "What's the difference between _scm.h and __scm.h?"
  48
  49    _scm.h is not installed; it's only visible to the libguile sources
  50    themselves.
  51
  52    __scm.h is installed, and is #included by <libguile.h>.  If both
  53    the client and libguile need some piece of information, and it
  54    doesn't fit well into the header file for any particular module, it
  55    should go in __scm.h.  */
  56
  57
  58 /* {Supported Options}
  59  *
  60  * These may be defined or undefined.
  61  */
  62
  63 /* Old async mechanism */
  64 /* #define GUILE_OLD_ASYNC_CLICK */
  65
  66 /* New scheme for garbage collection */
  67 #define GUILE_NEW_GC_SCHEME
  68
  69 /* #define GUILE_DEBUG_FREELIST */
  70
  71 /* If the compile FLAG `SCM_CAUTIOUS' is #defined then the number of
  72  * arguments is always checked for application of closures.  If the
  73  * compile FLAG `SCM_RECKLESS' is #defined then they are not checked.
  74  * Otherwise, number of argument checks for closures are made only when
  75  * the function position (whose value is the closure) of a combination is
  76  * not an ILOC or GLOC.  When the function position of a combination is a
  77  * symbol it will be checked only the first time it is evaluated because
  78  * it will then be replaced with an ILOC or GLOC.
  79  */
  80 #undef SCM_RECKLESS
  81 #define SCM_CAUTIOUS
  82
  83 /* After looking up a local for the first time, rewrite the
  84  * code graph, caching its position.
  85  */
  86 #define MEMOIZE_LOCALS
  87
  88 /* All the number support there is.
  89  */
  90 #define BIGNUMS
  91
  92 /* GC should relinquish empty cons-pair arenas.
  93  */
  94 #ifndef GUILE_NEW_GC_SCHEME
  95 #define GC_FREE_SEGMENTS
  96 #endif
  97
  98 /* Provide a scheme-accessible count-down timer that
  99  * generates a pseudo-interrupt.
 100  */
 101 #define TICKS
 102
 103
 104 /* Use engineering notation when converting numbers strings?
 105  */
 106 #undef ENGNOT
 107
 108 #undef SCM_CAREFUL_INTS
 109 \f
 110 /* {Unsupported Options}
 111  *
 112  * These must be defined as given here.
 113  */
 114
 115
 116 #define CCLO
 117
 118 /* Guile Scheme supports the #f/() distinction; Guile Lisp won't.  We
 119    have horrible plans for their unification.  */
 120 #undef SICP
 121
 122 \f
 123
 124 /* Random options (not yet supported or in final form). */
 125
 126 #define STACK_CHECKING
 127 #undef NO_CEVAL_STACK_CHECKING
 128
 129 \f
 130
 131 /* What did the configure script discover about the outside world?  */
 132 #include "libguile/scmconfig.h"
 133
 134 \f
 135
 136 /* {Debugging Options}
 137  *
 138  * These compile time options determine whether to include code that is only
 139  * useful for debugging guile itself or C level extensions to guile.  The
 140  * common prefix for all option macros of this kind is "SCM_DEBUG_".  It is
 141  * guaranteed that a macro named SCM_DEBUG_XXX is defined to be either 0 or 1,
 142  * i. e. there is no need to test for the undefined case.  This allows to use
 143  * these definitions comfortably in macro code, as in the following example:
 144  *   #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0)
 145  * Any sane compiler will remove the unused branch without any performance
 146  * penalty for the resulting code.
 147  *
 148  * Note:  Some SCM_DEBUG_XXX options are not settable at configure time.
 149  * To change the value of such options you will have to edit this header
 150  * file or give suitable options to make, like:
 151  *   make all CFLAGS="-DSCM_DEBUG_XXX=1 ..."
 152  */
 153
 154
 155 /* The value of SCM_DEBUG determines the default for most of the not yet
 156  * defined debugging options.  This allows, for example, to enable most of the
 157  * debugging options by simply defining SCM_DEBUG as 1.
 158  */
 159 #ifndef SCM_DEBUG
 160 #define SCM_DEBUG 0
 161 #endif
 162
 163 /* If SCM_DEBUG_DEPRECATED is set to 1, deprecated code is not compiled.  This
 164  * can be used by developers to get rid of references to deprecated code.
 165  */
 166 #ifndef SCM_DEBUG_DEPRECATED
 167 #define SCM_DEBUG_DEPRECATED SCM_DEBUG
 168 #endif
 169
 170 /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments
 171  * will check whether the rest arguments are actually passed as a proper list.
 172  * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest
 173  * arguments will take it for granted that these are passed as a proper list.
 174  */
 175 #ifndef SCM_DEBUG_REST_ARGUMENT
 176 #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG
 177 #endif
 178
 179 /* Use this for _compile time_ type checking only, since the compiled result
 180  * will be quite inefficient.  The right way to make use of this option is to
 181  * do a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=1', fix your
 182  * errors, and then do 'make clean; make'.
 183  */
 184 #ifndef SCM_DEBUG_TYPING_STRICTNESS
 185 #define SCM_DEBUG_TYPING_STRICTNESS 0
 186 #endif
 187
 188 \f
 189
 190 #ifdef HAVE_LONG_LONGS
 191
 192 /* Some auto-generated .h files contain unused prototypes
 193  * that need these typedefs.
 194  */
 195 typedef long long long_long;
 196 typedef unsigned long long ulong_long;
 197
 198 #endif /* HAVE_LONG_LONGS */
 199
 200 \f
 201
 202 /* Define
 203  *
 204  * SCM_CHAR_CODE_LIMIT          == UCHAR_MAX + 1
 205  * SCM_MOST_POSITIVE_FIXNUM     (LONG_MAX>>2)
 206  * SCM_MOST_NEGATIVE_FIXNUM     == SCM_SRS((long)LONG_MIN, 2)
 207  */
 208
 209 #ifdef HAVE_LIMITS_H
 210 # include <limits.h>
 211 # ifdef UCHAR_MAX
 212 #  define SCM_CHAR_CODE_LIMIT (UCHAR_MAX+1L)
 213 # else
 214 #  define SCM_CHAR_CODE_LIMIT 256L
 215 # endif /* def UCHAR_MAX */
 216 # define SCM_MOST_POSITIVE_FIXNUM (LONG_MAX>>2)
 217 # ifdef _UNICOS                 /* Stupid cray bug */
 218 #  define SCM_MOST_NEGATIVE_FIXNUM ((long)LONG_MIN/4)
 219 # else
 220 #  define SCM_MOST_NEGATIVE_FIXNUM SCM_SRS((long)LONG_MIN, 2)
 221 # endif                         /* UNICOS */
 222 #else
 223 # define SCM_CHAR_CODE_LIMIT 256L
 224 # define SCM_MOST_POSITIVE_FIXNUM ((long)((unsigned long)~0L>>3))
 225 # if (0 != ~0)
 226 #  define SCM_MOST_NEGATIVE_FIXNUM (-SCM_MOST_POSITIVE_FIXNUM-1)
 227 # else
 228 #  define SCM_MOST_NEGATIVE_FIXNUM (-SCM_MOST_POSITIVE_FIXNUM)
 229 # endif /*  (0 != ~0) */
 230 #endif /* def HAVE_LIMITS_H */
 231 \f
 232
 233 #ifdef STDC_HEADERS
 234 # include <stdlib.h>
 235 # ifdef AMIGA
 236 #  include <stddef.h>
 237 # endif /* def AMIGA */
 238 # define scm_sizet size_t
 239 #else
 240 # ifdef _SIZE_T
 241 #  define scm_sizet size_t
 242 # else
 243 #  define scm_sizet unsigned int
 244 # endif /* def _SIZE_T */
 245 #endif /* def STDC_HEADERS */
 246
 247 \f
 248
 249 #include "libguile/tags.h"
 250
 251 \f
 252 #ifdef vms
 253 # ifndef CHEAP_CONTINUATIONS
 254    typedef int jmp_buf[17];
 255    extern int setjump(jmp_buf env);
 256    extern int longjump(jmp_buf env, int ret);
 257 #  define setjmp setjump
 258 #  define longjmp longjump
 259 # else
 260 #  include <setjmp.h>
 261 # endif
 262 #else                           /* ndef vms */
 263 # ifdef _CRAY1
 264     typedef int jmp_buf[112];
 265     extern int setjump(jmp_buf env);
 266     extern int longjump(jmp_buf env, int ret);
 267 #  define setjmp setjump
 268 #  define longjmp longjump
 269 # else                          /* ndef _CRAY1 */
 270 #  include <setjmp.h>
 271 # endif                         /* ndef _CRAY1 */
 272 #endif                          /* ndef vms */
 273
 274 /* James Clark came up with this neat one instruction fix for
 275  * continuations on the SPARC.  It flushes the register windows so
 276  * that all the state of the process is contained in the stack.
 277  */
 278
 279 #ifdef sparc
 280 # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3")
 281 #else
 282 # define SCM_FLUSH_REGISTER_WINDOWS /* empty */
 283 #endif
 284
 285 /* If stack is not longword aligned then
 286  */
 287
 288 /* #define SHORT_ALIGN */
 289 #ifdef THINK_C
 290 # define SHORT_ALIGN
 291 #endif
 292 #ifdef MSDOS
 293 # define SHORT_ALIGN
 294 #endif
 295 #ifdef atarist
 296 # define SHORT_ALIGN
 297 #endif
 298
 299 #ifdef SHORT_ALIGN
 300 typedef short SCM_STACKITEM;
 301 #else
 302 typedef long SCM_STACKITEM;
 303 #endif
 304 \f
 305
 306 #ifndef USE_THREADS
 307 #define SCM_THREAD_DEFER
 308 #define SCM_THREAD_ALLOW
 309 #define SCM_THREAD_REDEFER
 310 #define SCM_THREAD_SWITCHING_CODE
 311 #endif
 312
 313 #ifdef GUILE_OLD_ASYNC_CLICK
 314 extern unsigned int scm_async_clock;
 315
 316 #define SCM_ASYNC_TICK \
 317 do { \
 318   if (0 == --scm_async_clock) \
 319     scm_async_click (); \
 320 } while(0)
 321 #else
 322 extern int scm_asyncs_pending_p;
 323
 324 #define SCM_ASYNC_TICK /*fixme* should change names */ \
 325 do { \
 326   if (scm_asyncs_pending_p) \
 327     scm_async_click (); \
 328 } while (0)
 329 #endif
 330
 331 #ifdef SCM_CAREFUL_INTS
 332 #define SCM_CHECK_NOT_DISABLED \
 333   if (scm_ints_disabled) \
 334     fputs("ints already disabled\n", stderr); \
 335
 336 #define SCM_CHECK_NOT_ENABLED \
 337   if (!scm_ints_disabled) \
 338     fputs("ints already enabled\n", stderr); \
 339
 340 #else
 341 #define SCM_CHECK_NOT_DISABLED
 342 #define SCM_CHECK_NOT_ENABLED
 343 #endif
 344
 345
 346 /* Anthony Green writes:
 347    When the compiler sees...
 348            DEFER_INTS;
 349            [critical code here]
 350            ALLOW_INTS;
 351    ...it doesn't actually promise to keep the critical code within the
 352    boundries of the DEFER/ALLOW_INTS instructions. It may very well
 353    schedule it outside of the magic defined in those macros.
 354
 355    However, GCC's volatile asm feature forms a barrier over which code is
 356    never moved. So if you add...
 357            asm ("");
 358    ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical
 359    code will always remain in place.  asm's without inputs or outputs
 360    are implicitly volatile. */
 361 #ifdef __GNUC__
 362 #define SCM_FENCE asm /* volatile */ ("")
 363 #else
 364 #define SCM_FENCE
 365 #endif
 366
 367 #define SCM_DEFER_INTS \
 368 do { \
 369   SCM_FENCE; \
 370   SCM_CHECK_NOT_DISABLED; \
 371   SCM_THREAD_DEFER; \
 372   SCM_FENCE; \
 373   scm_ints_disabled = 1; \
 374   SCM_FENCE; \
 375 } while (0)
 376
 377
 378 #define SCM_ALLOW_INTS_ONLY \
 379 do { \
 380   SCM_THREAD_ALLOW; \
 381   scm_ints_disabled = 0; \
 382 } while (0)
 383
 384
 385 #define SCM_ALLOW_INTS \
 386 do { \
 387   SCM_FENCE; \
 388   SCM_CHECK_NOT_ENABLED; \
 389   SCM_THREAD_SWITCHING_CODE; \
 390   SCM_FENCE; \
 391   scm_ints_disabled = 0; \
 392   SCM_FENCE; \
 393   SCM_THREAD_ALLOW; \
 394   SCM_FENCE; \
 395 } while (0)
 396
 397
 398 #define SCM_REDEFER_INTS  \
 399 do { \
 400   SCM_FENCE; \
 401   SCM_THREAD_REDEFER; \
 402   ++scm_ints_disabled; \
 403   SCM_FENCE; \
 404 } while (0)
 405
 406
 407 #define SCM_REALLOW_INTS \
 408 do { \
 409   SCM_FENCE; \
 410   SCM_THREAD_SWITCHING_CODE; \
 411   SCM_FENCE; \
 412   --scm_ints_disabled; \
 413   SCM_FENCE; \
 414 } while (0)
 415
 416
 417 #define SCM_TICK \
 418 do { \
 419   SCM_DEFER_INTS; \
 420   SCM_ALLOW_INTS; \
 421   SCM_ASYNC_TICK; \
 422 } while (0)
 423
 424 \f
 425
 426 /* Classification of critical sections
 427  *
 428  * When Guile moves to POSIX threads, it won't be possible to prevent
 429  * context switching.  In fact, the whole idea of context switching is
 430  * bogus if threads are run by different processors.  Therefore, we
 431  * must ultimately eliminate all critical sections or enforce them by
 432  * use of mutecis.
 433  *
 434  * All instances of SCM_DEFER_INTS and SCM_ALLOW_INTS should therefore
 435  * be classified and replaced by one of the delimiters below.  If you
 436  * understand what this is all about, I'd like to encourage you to
 437  * help with this task.  The set of classes below must of course be
 438  * incrementally augmented.
 439  *
 440  * MDJ 980419 <djurfeldt@nada.kth.se>
 441  */
 442
 443 /* A sections
 444  *
 445  * Allocation of a cell with type tag in the CAR.
 446  *
 447  * With POSIX threads, each thread will have a private pool of free
 448  * cells.  Therefore, this type of section can be removed.  But!  It
 449  * is important that the CDR is initialized first (with the CAR still
 450  * indicating a free cell) so that we can guarantee a consistent heap
 451  * at all times.
 452  */
 453
 454 #ifdef SCM_POSIX_THREADS
 455 #define SCM_ENTER_A_SECTION
 456 #define SCM_EXIT_A_SECTION
 457 #else
 458 #define SCM_ENTER_A_SECTION SCM_DEFER_INTS
 459 #define SCM_EXIT_A_SECTION SCM_ALLOW_INTS
 460 #endif
 461
 462 \f
 463
 464 /** SCM_ASSERT
 465  **
 466  **/
 467
 468
 469 #ifdef SCM_RECKLESS
 470 #define SCM_ASSERT(_cond, _arg, _pos, _subr)
 471 #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr)
 472 #define SCM_ASRTGO(_cond, _label)
 473 #else
 474 #define SCM_ASSERT(_cond, _arg, _pos, _subr) \
 475         if (!(_cond)) \
 476           scm_wta(_arg, (char *)(_pos), _subr)
 477 #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) \
 478         if (!(_cond)) \
 479           scm_wrong_type_arg_msg(_subr, _pos, _arg, _msg)
 480 #define SCM_ASRTGO(_cond, _label) \
 481         if (!(_cond)) \
 482           goto _label
 483 #endif
 484
 485 /*
 486  * SCM_WTA_DISPATCH
 487  */
 488
 489 /* Dirk:FIXME:: In all of the SCM_WTA_DISPATCH_* macros it is assumed that
 490  * 'gf' is zero if uninitialized.  It would be cleaner if some valid SCM value
 491  * like SCM_BOOL_F or SCM_UNDEFINED was chosen.
 492  */
 493
 494 extern SCM scm_call_generic_0 (SCM gf);
 495
 496 #define SCM_WTA_DISPATCH_0(gf, arg, pos, subr) \
 497   return (SCM_UNPACK (gf) \
 498           ? scm_call_generic_0 ((gf)) \
 499           : scm_wta ((arg), (char *) (pos), (subr)))
 500 #define SCM_GASSERT0(cond, gf, arg, pos, subr) \
 501   if (!(cond)) SCM_WTA_DISPATCH_0((gf), (arg), (pos), (subr))
 502
 503 extern SCM scm_call_generic_1 (SCM gf, SCM a1);
 504
 505 #define SCM_WTA_DISPATCH_1(gf, a1, pos, subr) \
 506   return (SCM_UNPACK (gf) \
 507           ? scm_call_generic_1 ((gf), (a1)) \
 508           : scm_wta ((a1), (char *) (pos), (subr)))
 509 #define SCM_GASSERT1(cond, gf, a1, pos, subr) \
 510   if (!(cond)) SCM_WTA_DISPATCH_1((gf), (a1), (pos), (subr))
 511
 512 extern SCM scm_call_generic_2 (SCM gf, SCM a1, SCM a2);
 513
 514 #define SCM_WTA_DISPATCH_2(gf, a1, a2, pos, subr) \
 515   return (SCM_UNPACK (gf) \
 516           ? scm_call_generic_2 ((gf), (a1), (a2)) \
 517           : scm_wta ((pos) == SCM_ARG1 ? (a1) : (a2), (char *) (pos), (subr)))
 518 #define SCM_GASSERT2(cond, gf, a1, a2, pos, subr) \
 519   if (!(cond)) SCM_WTA_DISPATCH_2((gf), (a1), (a2), (pos), (subr))
 520
 521 extern SCM scm_apply_generic (SCM gf, SCM args);
 522
 523 #define SCM_WTA_DISPATCH_n(gf, args, pos, subr) \
 524   return (SCM_UNPACK (gf) \
 525           ? scm_apply_generic ((gf), (args)) \
 526           : scm_wta (scm_list_ref ((args), SCM_MAKINUM ((pos) - 1)), \
 527                      (char *) (pos), \
 528                      (subr)))
 529 #define SCM_GASSERTn(cond, gf, args, pos, subr) \
 530   if (!(cond)) SCM_WTA_DISPATCH_n((gf), (args), (pos), (subr))
 531
 532 #ifndef SCM_MAGIC_SNARFER
 533 /* Let these macros pass through if
 534    we are snarfing;  thus we can tell the
 535    difference between the use of an actual
 536    number vs. the use of one of these macros --
 537    actual numbers in SCM_VALIDATE_* and SCM_ASSERT
 538    constructs must match the formal argument name,
 539    but using SCM_ARG* avoids the test */
 540
 541 #define SCM_ARGn                0
 542 #define SCM_ARG1                1
 543 #define SCM_ARG2                2
 544 #define SCM_ARG3                3
 545 #define SCM_ARG4                4
 546 #define SCM_ARG5                5
 547 #define SCM_ARG6                6
 548 #define SCM_ARG7                7
 549      /* #define SCM_ARGERR(X)           ((X) < SCM_WNA \
 550                                  ? (char *)(X) \
 551                                  : "wrong type argument")
 552                                  */
 553
 554 /* Following must match entry indexes in scm_errmsgs[].
 555  * Also, SCM_WNA must follow the last SCM_ARGn in sequence.
 556  */
 557 #define SCM_WNA                 8
 558      /* #define SCM_OVSCM_FLOW          9 */
 559 #define SCM_OUTOFRANGE          10
 560 #define SCM_NALLOC              11
 561      /* #define SCM_STACK_OVFLOW        12 */
 562      /* #define SCM_EXIT                13 */
 563
 564 #endif /* SCM_MAGIC_SNARFER */
 565
 566 /* (...still matching scm_errmsgs)  These
 567  * are signals.  Signals may become errors
 568  * but are distinguished because they first
 569  * try to invoke a handler that can resume
 570  * the interrupted routine.
 571  */
 572 #define SCM_HUP_SIGNAL          14
 573 #define SCM_INT_SIGNAL          15
 574 #define SCM_FPE_SIGNAL          16
 575 #define SCM_BUS_SIGNAL          17
 576 #define SCM_SEGV_SIGNAL         18
 577 #define SCM_ALRM_SIGNAL         19
 578 #define SCM_GC_SIGNAL           20
 579 #define SCM_TICK_SIGNAL         21
 580
 581 #define SCM_SIG_ORD(X)          ((X) - SCM_HUP_SIGNAL)
 582 #define SCM_ORD_SIG(X)          ((X) + SCM_HUP_SIGNAL)
 583 #define SCM_NUM_SIGS            (SCM_SIG_ORD (SCM_TICK_SIGNAL) + 1)
 584
 585 #if 0
 586 struct errdesc
 587 {
 588   char *msg;
 589   char *s_response;
 590   short parent_err;
 591 };
 592
 593
 594 extern struct errdesc scm_errmsgs[];
 595 #endif
 596
 597 \f
 598
 599 /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors
 600  * were encountered.  SCM_EXIT_FAILURE is the default code to return from
 601  * SCM if errors were encountered.  The return code can be explicitly
 602  * specified in a SCM program with (scm_quit <n>).
 603  */
 604
 605 #ifndef SCM_EXIT_SUCCESS
 606 #ifdef vms
 607 #define SCM_EXIT_SUCCESS 1
 608 #else
 609 #define SCM_EXIT_SUCCESS 0
 610 #endif /* def vms */
 611 #endif /* ndef SCM_EXIT_SUCCESS */
 612 #ifndef SCM_EXIT_FAILURE
 613 #ifdef vms
 614 #define SCM_EXIT_FAILURE 2
 615 #else
 616 #define SCM_EXIT_FAILURE 1
 617 #endif /* def vms */
 618 #endif /* ndef SCM_EXIT_FAILURE */
 619
 620
 621
 622 \f
 623
 624 #endif  /* __SCMH */
 625
 626 /*
 627   Local Variables:
 628   c-file-style: "gnu"
 629   End:
 630 */