libguile/__scm.h

   1 /* classes: h_files */
   2
   3 #ifndef SCM___SCM_H
   4 #define SCM___SCM_H
   5
   6 /* Copyright (C) 1995,1996,1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2, or (at your option)
  11  * any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this software; see the file COPYING.  If not, write to
  20  * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  21  * Boston, MA 02111-1307 USA
  22  *
  23  * As a special exception, the Free Software Foundation gives permission
  24  * for additional uses of the text contained in its release of GUILE.
  25  *
  26  * The exception is that, if you link the GUILE library with other files
  27  * to produce an executable, this does not by itself cause the
  28  * resulting executable to be covered by the GNU General Public License.
  29  * Your use of that executable is in no way restricted on account of
  30  * linking the GUILE library code into it.
  31  *
  32  * This exception does not however invalidate any other reasons why
  33  * the executable file might be covered by the GNU General Public License.
  34  *
  35  * This exception applies only to the code released by the
  36  * Free Software Foundation under the name GUILE.  If you copy
  37  * code from other Free Software Foundation releases into a copy of
  38  * GUILE, as the General Public License permits, the exception does
  39  * not apply to the code that you add in this way.  To avoid misleading
  40  * anyone as to the status of such modified files, you must delete
  41  * this exception notice from them.
  42  *
  43  * If you write modifications of your own for GUILE, it is your choice
  44  * whether to permit this exception to apply to your modifications.
  45  * If you do not wish that, delete this exception notice.  */
  46
  47 \f
  48
  49 /**********************************************************************
  50  This file is Guile's central public header.
  51
  52  When included by other files, this file should preceed any include
  53  other than __scm.h.
  54
  55  Under *NO* circumstances should new items be added to the global
  56  namespace (via adding #define, typedef, or similar to this file) with
  57  generic names.  This usually means that any new names should be
  58  prefixed by either SCM_ or GUILE_.  i.e. do *not* #define HAVE_FOO or
  59  SIZEOF_BAR.  See configure.in, gen-scmconfig.h.in, and
  60  gen-scmconfig.c for examples of how to properly handle this issue.
  61  The main documentation is in gen-scmconfig.c.
  62
  63  "What's the difference between _scm.h and __scm.h?"
  64
  65    _scm.h is not installed; it's only visible to the libguile sources
  66    themselves, and it includes config.h, the private config header.
  67
  68    __scm.h is installed, and is #included by <libguile.h>.  If both
  69    the client and libguile need some piece of information, and it
  70    doesn't fit well into the header file for any particular module, it
  71    should go in __scm.h.  __scm.h includes scmconfig.h, the public
  72    config header.
  73  **********************************************************************/
  74
  75 /* What did the configure script discover about the outside world?  */
  76 #include "libguile/scmconfig.h"
  77
  78 \f
  79
  80 /* {Compiler hints}
  81  *
  82  * The following macros are used to provide additional information for the
  83  * compiler, which may help to do better error checking and code
  84  * optimization.  A second benefit of these macros is, that they also provide
  85  * additional information to the developers.
  86  */
  87
  88 /* The macro SCM_NORETURN indicates that a function will never return.
  89  * Examples:
  90  *   1) int foo (char arg) SCM_NORETURN;
  91  */
  92 #ifdef __GNUC__
  93 #define SCM_NORETURN __attribute__ ((noreturn))
  94 #else
  95 #define SCM_NORETURN
  96 #endif
  97
  98 /* The macro SCM_UNUSED indicates that a function, function argument or
  99  * variable may potentially be unused.
 100  * Examples:
 101  *   1) static int unused_function (char arg) SCM_UNUSED;
 102  *   2) int foo (char unused_argument SCM_UNUSED);
 103  *   3) int unused_variable SCM_UNUSED;
 104  */
 105 #ifdef __GNUC__
 106 #define SCM_UNUSED __attribute__ ((unused))
 107 #else
 108 #define SCM_UNUSED
 109 #endif
 110
 111
 112 /* {Supported Options}
 113  *
 114  * These may be defined or undefined.
 115  */
 116
 117 /* #define GUILE_DEBUG_FREELIST */
 118
 119 /* All the number support there is.
 120  */
 121 #define BIGNUMS
 122
 123 /* GC should relinquish empty cons-pair arenas. */
 124 /* cmm:FIXME look at this after done mangling the GC */
 125 /* #define GC_FREE_SEGMENTS */
 126
 127 /* Provide a scheme-accessible count-down timer that
 128  * generates a pseudo-interrupt.
 129  */
 130 #define TICKS
 131
 132
 133 /* Use engineering notation when converting numbers strings?
 134  */
 135 #undef ENGNOT
 136
 137 \f
 138 /* {Unsupported Options}
 139  *
 140  * These must be defined as given here.
 141  */
 142
 143
 144 #define CCLO
 145
 146 /* Guile Scheme supports the #f/() distinction; Guile Lisp won't.  We
 147    have horrible plans for their unification.  */
 148 #undef SICP
 149
 150 \f
 151
 152 /* Random options (not yet supported or in final form). */
 153
 154 #define STACK_CHECKING
 155 #undef NO_CEVAL_STACK_CHECKING
 156
 157 \f
 158
 159 /* SCM_API is a macro prepended to all function and data definitions
 160    which should be exported or imported in the resulting dynamic link
 161    library (DLL) in the Win32 port. */
 162
 163 #if defined (SCM_IMPORT)
 164 # define SCM_API __declspec (dllimport) extern
 165 #elif defined (SCM_EXPORT) || defined (DLL_EXPORT)
 166 # define SCM_API __declspec (dllexport) extern
 167 #else
 168 # define SCM_API extern
 169 #endif
 170
 171 \f
 172
 173 /* {Debugging Options}
 174  *
 175  * These compile time options determine whether to include code that is only
 176  * useful for debugging guile itself or C level extensions to guile.  The
 177  * common prefix for all option macros of this kind is "SCM_DEBUG_".  It is
 178  * guaranteed that a macro named SCM_DEBUG_XXX is always defined (typically to
 179  * either 0 or 1), i. e. there is no need to test for the undefined case.
 180  * This allows to use these definitions comfortably within code, as in the
 181  * following example:
 182  *   #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0)
 183  * Any sane compiler will remove the unused branch without any performance
 184  * penalty for the resulting code.
 185  *
 186  * Note:  Some SCM_DEBUG_XXX options are not settable at configure time.
 187  * To change the value of such options you will have to edit this header
 188  * file or give suitable options to make, like:
 189  *   make all CFLAGS="-DSCM_DEBUG_XXX=1 ..."
 190  */
 191
 192
 193 /* The value of SCM_DEBUG determines the default for most of the not yet
 194  * defined debugging options.  This allows, for example, to enable most of the
 195  * debugging options by simply defining SCM_DEBUG as 1.
 196  */
 197 #ifndef SCM_DEBUG
 198 #define SCM_DEBUG 0
 199 #endif
 200
 201 /* If SCM_DEBUG_CELL_ACCESSES is set to 1, cell accesses will perform
 202  * exhaustive parameter checking:  It will be verified that cell parameters
 203  * actually point to a valid heap cell.  Note:  If this option is enabled,
 204  * guile will run about ten times slower than normally.
 205  */
 206 #ifndef SCM_DEBUG_CELL_ACCESSES
 207 #define SCM_DEBUG_CELL_ACCESSES SCM_DEBUG
 208 #endif
 209
 210 /* If SCM_DEBUG_INTERRUPTS is set to 1, with every deferring and allowing of
 211  * interrupts a consistency check will be performed.
 212  */
 213 #ifndef SCM_DEBUG_INTERRUPTS
 214 #define SCM_DEBUG_INTERRUPTS SCM_DEBUG
 215 #endif
 216
 217 /* If SCM_DEBUG_PAIR_ACCESSES is set to 1, accesses to cons cells will be
 218  * exhaustively checked.  Note:  If this option is enabled, guile will run
 219  * slower than normally.
 220  */
 221 #ifndef SCM_DEBUG_PAIR_ACCESSES
 222 #define SCM_DEBUG_PAIR_ACCESSES SCM_DEBUG
 223 #endif
 224
 225 /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments
 226  * will check whether the rest arguments are actually passed as a proper list.
 227  * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest
 228  * arguments will take it for granted that these are passed as a proper list.
 229  */
 230 #ifndef SCM_DEBUG_REST_ARGUMENT
 231 #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG
 232 #endif
 233
 234 /* The macro SCM_DEBUG_TYPING_STRICTNESS indicates what level of type checking
 235  * shall be performed with respect to the use of the SCM datatype.  The macro
 236  * may be defined to one of the values 0, 1 and 2.
 237  *
 238  * A value of 0 means that there will be no compile time type checking, since
 239  * the SCM datatype will be declared as an integral type.  This setting should
 240  * only be used on systems, where casting from integral types to pointers may
 241  * lead to loss of bit information.
 242  *
 243  * A value of 1 means that there will an intermediate level of compile time
 244  * type checking, since the SCM datatype will be declared as a pointer to an
 245  * undefined struct.  This setting is the default, since it does not cost
 246  * anything in terms of performance or code size.
 247  *
 248  * A value of 2 provides a maximum level of compile time type checking since
 249  * the SCM datatype will be declared as a struct.  This setting should be used
 250  * for _compile time_ type checking only, since the compiled result is likely
 251  * to be quite inefficient.  The right way to make use of this option is to do
 252  * a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=2', fix your
 253  * errors, and then do 'make clean; make'.
 254  */
 255 #ifndef SCM_DEBUG_TYPING_STRICTNESS
 256 #define SCM_DEBUG_TYPING_STRICTNESS 1
 257 #endif
 258
 259 /* If SCM_DEBUG_DEBUGGING_SUPPORT is set to 1, guile will provide a set of
 260  * special functions that support debugging with a debugger like gdb or
 261  * debugging of guile internals on the scheme level.  The behaviour of guile
 262  * is not changed by this macro, only the set of functions that are available
 263  * will differ.  All functions that are introduced this way have the prefix
 264  * 'scm_dbg_' on the C level and the prefix 'dbg-' on the scheme level.  This
 265  * allows to easily determine the set of support functions, given that your
 266  * debugger or repl provide automatic name completion.  Note that these
 267  * functions are intended to be used during interactive debugging sessions
 268  * only.  They are not considered part of guile's official API.  They may
 269  * change or disappear without notice or deprecation phase.
 270  */
 271 #ifndef SCM_DEBUG_DEBUGGING_SUPPORT
 272 #define SCM_DEBUG_DEBUGGING_SUPPORT SCM_DEBUG
 273 #endif
 274
 275 \f
 276
 277 /* {Feature Options}
 278  *
 279  * These compile time options determine whether code for certain features
 280  * should be compiled into guile.  The common prefix for all option macros
 281  * of this kind is "SCM_ENABLE_".  It is guaranteed that a macro named
 282  * SCM_ENABLE_XXX is defined to be either 0 or 1, i. e. there is no need to
 283  * test for the undefined case.  This allows to use these definitions
 284  * comfortably within code, as in the following example:
 285  *   #define FOO do { if (SCM_ENABLE_XXX) bar(); else baz(); } while (0)
 286  * Any sane compiler will remove the unused branch without any performance
 287  * penalty for the resulting code.
 288  *
 289  * Note:  Some SCM_ENABLE_XXX options are not settable at configure time.
 290  * To change the value of such options you will have to edit this header
 291  * file or give suitable options to make, like:
 292  *   make all CFLAGS="-DSCM_ENABLE_XXX=1 ..."
 293  */
 294
 295 /* If SCM_ENABLE_DEPRECATED is set to 1, deprecated code will be included in
 296  * guile, as well as some functions to issue run-time warnings about uses of
 297  * deprecated functions.
 298  */
 299 #ifndef SCM_ENABLE_DEPRECATED
 300 #define SCM_ENABLE_DEPRECATED 0
 301 #endif
 302
 303 \f
 304
 305 /* {Architecture and compiler properties}
 306  *
 307  * Guile as of today can only work on systems which fulfill at least the
 308  * following requirements:
 309  *
 310  * - scm_t_bits and SCM variables have at least 32 bits.
 311  *   Guile's type system is based on this assumption.
 312  *
 313  * - sizeof (scm_t_bits) >= sizeof (void*) and sizeof (SCM) >= sizeof (void*)
 314  *   Guile's type system is based on this assumption, since it must be
 315  *   possible to store pointers to cells on the heap in scm_t_bits and SCM
 316  *   variables.
 317  *
 318  * - sizeof (scm_t_bits) >= 4 and sizeof (scm_t_bits) is a power of 2.
 319  *   Guile's type system is based on this assumption.  In particular, it is
 320  *   assumed that cells, i. e. pairs of scm_t_bits variables, are eight
 321  *   character aligned.  This is because three bits of a scm_t_bits variable
 322  *   that is holding a pointer to a cell on the heap must be available for
 323  *   storing type data.
 324  *
 325  * - sizeof (scm_t_bits) <= sizeof (void*) and sizeof (SCM) <= sizeof (void*)
 326  *   In some parts of guile, scm_t_bits and SCM variables are passed to
 327  *   functions as void* arguments.  Together with the requirement above, this
 328  *   requires a one-to-one correspondence between the size of a void* and the
 329  *   sizes of scm_t_bits and SCM variables.
 330  *
 331  * - numbers are encoded using two's complement.
 332  *   The implementation of the bitwise scheme level operations is based on
 333  *   this assumption.
 334  *
 335  * - ... add more
 336  */
 337
 338 #ifdef CHAR_BIT
 339 # define SCM_CHAR_BIT CHAR_BIT
 340 #else
 341 # define SCM_CHAR_BIT 8
 342 #endif
 343
 344 #ifdef LONG_BIT
 345 # define SCM_LONG_BIT LONG_BIT
 346 #else
 347 # define SCM_LONG_BIT (SCM_CHAR_BIT * sizeof (long) / sizeof (char))
 348 #endif
 349
 350 #ifdef UCHAR_MAX
 351 # define SCM_CHAR_CODE_LIMIT (UCHAR_MAX + 1L)
 352 #else
 353 # define SCM_CHAR_CODE_LIMIT 256L
 354 #endif
 355
 356 \f
 357
 358 #include "libguile/tags.h"
 359
 360 \f
 361 #ifdef vms
 362 # ifndef CHEAP_CONTINUATIONS
 363    typedef int jmp_buf[17];
 364    extern int setjump(jmp_buf env);
 365    extern int longjump(jmp_buf env, int ret);
 366 #  define setjmp setjump
 367 #  define longjmp longjump
 368 # else
 369 #  include <setjmp.h>
 370 # endif
 371 #else                           /* ndef vms */
 372 # ifdef _CRAY1
 373     typedef int jmp_buf[112];
 374     extern int setjump(jmp_buf env);
 375     extern int longjump(jmp_buf env, int ret);
 376 #  define setjmp setjump
 377 #  define longjmp longjump
 378 # else                          /* ndef _CRAY1 */
 379 #  include <setjmp.h>
 380 # endif                         /* ndef _CRAY1 */
 381 #endif                          /* ndef vms */
 382
 383 /* James Clark came up with this neat one instruction fix for
 384  * continuations on the SPARC.  It flushes the register windows so
 385  * that all the state of the process is contained in the stack.
 386  */
 387
 388 #if defined (sparc) || defined (__sparc__) || defined (__sparc)
 389 # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3")
 390 #else
 391 # define SCM_FLUSH_REGISTER_WINDOWS /* empty */
 392 #endif
 393
 394 /* If stack is not longword aligned then
 395  */
 396
 397 /* #define SHORT_ALIGN */
 398 #ifdef THINK_C
 399 # define SHORT_ALIGN
 400 #endif
 401 #ifdef MSDOS
 402 # define SHORT_ALIGN
 403 #endif
 404 #ifdef atarist
 405 # define SHORT_ALIGN
 406 #endif
 407
 408 #ifdef SHORT_ALIGN
 409 typedef short SCM_STACKITEM;
 410 #else
 411 typedef long SCM_STACKITEM;
 412 #endif
 413
 414 /* Cast pointer through (void *) in order to avoid compiler warnings
 415    when strict aliasing is enabled */
 416 #define SCM_STACK_PTR(ptr) ((SCM_STACKITEM *) (void *) (ptr))
 417 \f
 418
 419 #define SCM_ASYNC_TICK /*fixme* should change names */ \
 420 do { \
 421   if (scm_root->pending_asyncs) \
 422     scm_async_click (); \
 423 } while (0)
 424
 425
 426 /* Anthony Green writes:
 427    When the compiler sees...
 428            DEFER_INTS;
 429            [critical code here]
 430            ALLOW_INTS;
 431    ...it doesn't actually promise to keep the critical code within the
 432    boundries of the DEFER/ALLOW_INTS instructions. It may very well
 433    schedule it outside of the magic defined in those macros.
 434
 435    However, GCC's volatile asm feature forms a barrier over which code is
 436    never moved. So if you add...
 437            asm ("");
 438    ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical
 439    code will always remain in place.  asm's without inputs or outputs
 440    are implicitly volatile. */
 441 #ifdef __GNUC__
 442 #define SCM_FENCE asm /* volatile */ ("")
 443 #elif defined (__INTEL_COMPILER) && defined (__ia64)
 444 #define SCM_FENCE __memory_barrier()
 445 #else
 446 #define SCM_FENCE
 447 #endif
 448
 449 #define SCM_DEFER_INTS scm_rec_mutex_lock (&scm_i_defer_mutex);
 450
 451 #define SCM_ALLOW_INTS scm_rec_mutex_unlock (&scm_i_defer_mutex);
 452
 453 #define SCM_REDEFER_INTS SCM_DEFER_INTS
 454
 455 #define SCM_REALLOW_INTS SCM_ALLOW_INTS
 456
 457 #define SCM_TICK \
 458 do { \
 459   SCM_ASYNC_TICK; \
 460   SCM_THREAD_SWITCHING_CODE; \
 461 } while (0)
 462
 463 \f
 464
 465 /* Note: The following needs updating. */
 466
 467 /* Classification of critical sections
 468  *
 469  * When Guile moves to POSIX threads, it won't be possible to prevent
 470  * context switching.  In fact, the whole idea of context switching is
 471  * bogus if threads are run by different processors.  Therefore, we
 472  * must ultimately eliminate all critical sections or enforce them by
 473  * use of mutecis.
 474  *
 475  * All instances of SCM_DEFER_INTS and SCM_ALLOW_INTS should therefore
 476  * be classified and replaced by one of the delimiters below.  If you
 477  * understand what this is all about, I'd like to encourage you to
 478  * help with this task.  The set of classes below must of course be
 479  * incrementally augmented.
 480  *
 481  * MDJ 980419 <djurfeldt@nada.kth.se>
 482  */
 483
 484 /* A sections
 485  *
 486  * Allocation of a cell with type tag in the CAR.
 487  *
 488  * With POSIX threads, each thread will have a private pool of free
 489  * cells.  Therefore, this type of section can be removed.  But!  It
 490  * is important that the CDR is initialized first (with the CAR still
 491  * indicating a free cell) so that we can guarantee a consistent heap
 492  * at all times.
 493  */
 494
 495 #define SCM_ENTER_A_SECTION SCM_CRITICAL_SECTION_START
 496 #define SCM_EXIT_A_SECTION SCM_CRITICAL_SECTION_END
 497
 498 \f
 499
 500 /** SCM_ASSERT
 501  **
 502  **/
 503
 504
 505 #ifdef SCM_RECKLESS
 506 #define SCM_ASSERT(_cond, _arg, _pos, _subr)
 507 #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg)
 508 #define SCM_ASRTGO(_cond, _label)
 509 #else
 510 #define SCM_ASSERT(_cond, _arg, _pos, _subr) \
 511         do { if (!(_cond)) \
 512           scm_wrong_type_arg (_subr, _pos, _arg); } while (0)
 513 #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) \
 514         do { if (!(_cond)) \
 515           scm_wrong_type_arg_msg(_subr, _pos, _arg, _msg);  } while (0)
 516 #define SCM_ASRTGO(_cond, _label) \
 517         do {  if (!(_cond)) \
 518           goto _label; } while (0)
 519 #endif
 520
 521 /*
 522  * SCM_WTA_DISPATCH
 523  */
 524
 525 /* Dirk:FIXME:: In all of the SCM_WTA_DISPATCH_* macros it is assumed that
 526  * 'gf' is zero if uninitialized.  It would be cleaner if some valid SCM value
 527  * like SCM_BOOL_F or SCM_UNDEFINED was chosen.
 528  */
 529
 530 SCM_API SCM scm_call_generic_0 (SCM gf);
 531
 532 #define SCM_WTA_DISPATCH_0(gf, subr)                            \
 533   return (SCM_UNPACK (gf)                                       \
 534           ? scm_call_generic_0 ((gf))                           \
 535           : (scm_error_num_args_subr ((subr)), SCM_UNSPECIFIED))
 536 #define SCM_GASSERT0(cond, gf, subr) \
 537   if (!(cond)) SCM_WTA_DISPATCH_0((gf), (subr))
 538
 539 SCM_API SCM scm_call_generic_1 (SCM gf, SCM a1);
 540
 541 #define SCM_WTA_DISPATCH_1(gf, a1, pos, subr)                   \
 542   return (SCM_UNPACK (gf)                                       \
 543           ? scm_call_generic_1 ((gf), (a1))                     \
 544           : (scm_wrong_type_arg ((subr), (pos), (a1)), SCM_UNSPECIFIED))
 545 #define SCM_GASSERT1(cond, gf, a1, pos, subr) \
 546   if (!(cond)) SCM_WTA_DISPATCH_1((gf), (a1), (pos), (subr))
 547
 548 SCM_API SCM scm_call_generic_2 (SCM gf, SCM a1, SCM a2);
 549
 550 #define SCM_WTA_DISPATCH_2(gf, a1, a2, pos, subr)                       \
 551   return (SCM_UNPACK (gf)                                               \
 552           ? scm_call_generic_2 ((gf), (a1), (a2))                       \
 553           : (scm_wrong_type_arg ((subr), (pos),                         \
 554                                  (pos) == SCM_ARG1 ? (a1) : (a2)),      \
 555              SCM_UNSPECIFIED))
 556 #define SCM_GASSERT2(cond, gf, a1, a2, pos, subr) \
 557   if (!(cond)) SCM_WTA_DISPATCH_2((gf), (a1), (a2), (pos), (subr))
 558
 559 SCM_API SCM scm_apply_generic (SCM gf, SCM args);
 560
 561 #define SCM_WTA_DISPATCH_n(gf, args, pos, subr)                           \
 562   return (SCM_UNPACK (gf)                                                 \
 563           ? scm_apply_generic ((gf), (args))                              \
 564           : (scm_wrong_type_arg ((subr), (pos),                           \
 565                                  scm_list_ref ((args),                    \
 566                                                scm_from_int ((pos) - 1))), \
 567              SCM_UNSPECIFIED))
 568 #define SCM_GASSERTn(cond, gf, args, pos, subr) \
 569   if (!(cond)) SCM_WTA_DISPATCH_n((gf), (args), (pos), (subr))
 570
 571 #ifndef SCM_MAGIC_SNARFER
 572 /* Let these macros pass through if
 573    we are snarfing;  thus we can tell the
 574    difference between the use of an actual
 575    number vs. the use of one of these macros --
 576    actual numbers in SCM_VALIDATE_* and SCM_ASSERT
 577    constructs must match the formal argument name,
 578    but using SCM_ARG* avoids the test */
 579
 580 #define SCM_ARGn                0
 581 #define SCM_ARG1                1
 582 #define SCM_ARG2                2
 583 #define SCM_ARG3                3
 584 #define SCM_ARG4                4
 585 #define SCM_ARG5                5
 586 #define SCM_ARG6                6
 587 #define SCM_ARG7                7
 588
 589 #endif /* SCM_MAGIC_SNARFER */
 590
 591 \f
 592
 593 /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors
 594  * were encountered.  SCM_EXIT_FAILURE is the default code to return from
 595  * SCM if errors were encountered.  The return code can be explicitly
 596  * specified in a SCM program with (scm_quit <n>).
 597  */
 598
 599 #ifndef SCM_EXIT_SUCCESS
 600 #ifdef vms
 601 #define SCM_EXIT_SUCCESS 1
 602 #else
 603 #define SCM_EXIT_SUCCESS 0
 604 #endif /* def vms */
 605 #endif /* ndef SCM_EXIT_SUCCESS */
 606 #ifndef SCM_EXIT_FAILURE
 607 #ifdef vms
 608 #define SCM_EXIT_FAILURE 2
 609 #else
 610 #define SCM_EXIT_FAILURE 1
 611 #endif /* def vms */
 612 #endif /* ndef SCM_EXIT_FAILURE */
 613
 614 /* Define SCM_C_INLINE_KEYWORD so that it can be used as a replacement
 615    for the "inline" keyword, expanding to nothing when "inline" is not
 616    available.
 617 */
 618
 619 #ifdef SCM_C_INLINE
 620 #define SCM_C_INLINE_KEYWORD SCM_C_INLINE
 621 #else
 622 #define SCM_C_INLINE_KEYWORD
 623 #endif
 624
 625 #endif  /* SCM___SCM_H */
 626
 627 /*
 628   Local Variables:
 629   c-file-style: "gnu"
 630   End:
 631 */