malloc/obstack.h

   1 /* obstack.h - object stack macros
   2    Copyright (C) 1988,89,90,91,92,93,94,96,97,98,99 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.  Its master source is NOT part of
   4    the C library, however.  The master source lives in /gd/gnu/lib.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* Summary:
  22
  23 All the apparent functions defined here are macros. The idea
  24 is that you would use these pre-tested macros to solve a
  25 very specific set of problems, and they would run fast.
  26 Caution: no side-effects in arguments please!! They may be
  27 evaluated MANY times!!
  28
  29 These macros operate a stack of objects.  Each object starts life
  30 small, and may grow to maturity.  (Consider building a word syllable
  31 by syllable.)  An object can move while it is growing.  Once it has
  32 been "finished" it never changes address again.  So the "top of the
  33 stack" is typically an immature growing object, while the rest of the
  34 stack is of mature, fixed size and fixed address objects.
  35
  36 These routines grab large chunks of memory, using a function you
  37 supply, called `obstack_chunk_alloc'.  On occasion, they free chunks,
  38 by calling `obstack_chunk_free'.  You must define them and declare
  39 them before using any obstack macros.
  40
  41 Each independent stack is represented by a `struct obstack'.
  42 Each of the obstack macros expects a pointer to such a structure
  43 as the first argument.
  44
  45 One motivation for this package is the problem of growing char strings
  46 in symbol tables.  Unless you are "fascist pig with a read-only mind"
  47 --Gosper's immortal quote from HAKMEM item 154, out of context--you
  48 would not like to put any arbitrary upper limit on the length of your
  49 symbols.
  50
  51 In practice this often means you will build many short symbols and a
  52 few long symbols.  At the time you are reading a symbol you don't know
  53 how long it is.  One traditional method is to read a symbol into a
  54 buffer, realloc()ating the buffer every time you try to read a symbol
  55 that is longer than the buffer.  This is beaut, but you still will
  56 want to copy the symbol from the buffer to a more permanent
  57 symbol-table entry say about half the time.
  58
  59 With obstacks, you can work differently.  Use one obstack for all symbol
  60 names.  As you read a symbol, grow the name in the obstack gradually.
  61 When the name is complete, finalize it.  Then, if the symbol exists already,
  62 free the newly read name.
  63
  64 The way we do this is to take a large chunk, allocating memory from
  65 low addresses.  When you want to build a symbol in the chunk you just
  66 add chars above the current "high water mark" in the chunk.  When you
  67 have finished adding chars, because you got to the end of the symbol,
  68 you know how long the chars are, and you can create a new object.
  69 Mostly the chars will not burst over the highest address of the chunk,
  70 because you would typically expect a chunk to be (say) 100 times as
  71 long as an average object.
  72
  73 In case that isn't clear, when we have enough chars to make up
  74 the object, THEY ARE ALREADY CONTIGUOUS IN THE CHUNK (guaranteed)
  75 so we just point to it where it lies.  No moving of chars is
  76 needed and this is the second win: potentially long strings need
  77 never be explicitly shuffled. Once an object is formed, it does not
  78 change its address during its lifetime.
  79
  80 When the chars burst over a chunk boundary, we allocate a larger
  81 chunk, and then copy the partly formed object from the end of the old
  82 chunk to the beginning of the new larger chunk.  We then carry on
  83 accreting characters to the end of the object as we normally would.
  84
  85 A special macro is provided to add a single char at a time to a
  86 growing object.  This allows the use of register variables, which
  87 break the ordinary 'growth' macro.
  88
  89 Summary:
  90         We allocate large chunks.
  91         We carve out one object at a time from the current chunk.
  92         Once carved, an object never moves.
  93         We are free to append data of any size to the currently
  94           growing object.
  95         Exactly one object is growing in an obstack at any one time.
  96         You can run one obstack per control block.
  97         You may have as many control blocks as you dare.
  98         Because of the way we do it, you can `unwind' an obstack
  99           back to a previous state. (You may remove objects much
 100           as you would with a stack.)
 101 */
 102
 103
 104 /* Don't do the contents of this file more than once.  */
 105
 106 #ifndef _OBSTACK_H
 107 #define _OBSTACK_H 1
 108
 109 #ifdef __cplusplus
 110 extern "C" {
 111 #endif
 112 \f
 113 /* We use subtraction of (char *) 0 instead of casting to int
 114    because on word-addressable machines a simple cast to int
 115    may ignore the byte-within-word field of the pointer.  */
 116
 117 #ifndef __PTR_TO_INT
 118 # define __PTR_TO_INT(P) ((P) - (char *) 0)
 119 #endif
 120
 121 #ifndef __INT_TO_PTR
 122 #if defined __STDC__ && __STDC__
 123 # define __INT_TO_PTR(P) ((void *) ((P) + (char *) 0))
 124 #else
 125 # define __INT_TO_PTR(P) ((P) + (char *) 0)
 126 #endif
 127 #endif
 128
 129 /* We need the type of the resulting object.  If __PTRDIFF_TYPE__ is
 130    defined, as with GNU C, use that; that way we don't pollute the
 131    namespace with <stddef.h>'s symbols.  Otherwise, if <stddef.h> is
 132    available, include it and use ptrdiff_t.  In traditional C, long is
 133    the best that we can do.  */
 134
 135 #ifdef __PTRDIFF_TYPE__
 136 # define PTR_INT_TYPE __PTRDIFF_TYPE__
 137 #else
 138 # ifdef HAVE_STDDEF_H
 139 #  include <stddef.h>
 140 #  define PTR_INT_TYPE ptrdiff_t
 141 # else
 142 #  define PTR_INT_TYPE long
 143 # endif
 144 #endif
 145
 146 #if defined _LIBC || defined HAVE_STRING_H
 147 # include <string.h>
 148 # define _obstack_memcpy(To, From, N) memcpy ((To), (From), (N))
 149 #else
 150 # ifdef memcpy
 151 #  define _obstack_memcpy(To, From, N) memcpy ((To), (From), (N))
 152 # else
 153 #  define _obstack_memcpy(To, From, N) bcopy ((From), (To), (N))
 154 # endif
 155 #endif
 156
 157 struct _obstack_chunk           /* Lives at front of each chunk. */
 158 {
 159   char  *limit;                 /* 1 past end of this chunk */
 160   struct _obstack_chunk *prev;  /* address of prior chunk or NULL */
 161   char  contents[4];            /* objects begin here */
 162 };
 163
 164 struct obstack          /* control current object in current chunk */
 165 {
 166   long  chunk_size;             /* preferred size to allocate chunks in */
 167   struct _obstack_chunk *chunk; /* address of current struct obstack_chunk */
 168   char  *object_base;           /* address of object we are building */
 169   char  *next_free;             /* where to add next char to current object */
 170   char  *chunk_limit;           /* address of char after current chunk */
 171   PTR_INT_TYPE temp;            /* Temporary for some macros.  */
 172   int   alignment_mask;         /* Mask of alignment for each object. */
 173 #if defined __STDC__ && __STDC__
 174   /* These prototypes vary based on `use_extra_arg', and we use
 175      casts to the prototypeless function type in all assignments,
 176      but having prototypes here quiets -Wstrict-prototypes.  */
 177   struct _obstack_chunk *(*chunkfun) (void *, long);
 178   void (*freefun) (void *, struct _obstack_chunk *);
 179   void *extra_arg;              /* first arg for chunk alloc/dealloc funcs */
 180 #else
 181   struct _obstack_chunk *(*chunkfun) (); /* User's fcn to allocate a chunk.  */
 182   void (*freefun) ();           /* User's function to free a chunk.  */
 183   char *extra_arg;              /* first arg for chunk alloc/dealloc funcs */
 184 #endif
 185   unsigned use_extra_arg:1;     /* chunk alloc/dealloc funcs take extra arg */
 186   unsigned maybe_empty_object:1;/* There is a possibility that the current
 187                                    chunk contains a zero-length object.  This
 188                                    prevents freeing the chunk if we allocate
 189                                    a bigger chunk to replace it. */
 190   unsigned alloc_failed:1;      /* No longer used, as we now call the failed
 191                                    handler on error, but retained for binary
 192                                    compatibility.  */
 193 };
 194
 195 /* Declare the external functions we use; they are in obstack.c.  */
 196
 197 #if defined __STDC__ && __STDC__
 198 extern void _obstack_newchunk (struct obstack *, int);
 199 extern void _obstack_free (struct obstack *, void *);
 200 extern int _obstack_begin (struct obstack *, int, int,
 201                             void *(*) (long), void (*) (void *));
 202 extern int _obstack_begin_1 (struct obstack *, int, int,
 203                              void *(*) (void *, long),
 204                              void (*) (void *, void *), void *);
 205 extern int _obstack_memory_used (struct obstack *);
 206 #else
 207 extern void _obstack_newchunk ();
 208 extern void _obstack_free ();
 209 extern int _obstack_begin ();
 210 extern int _obstack_begin_1 ();
 211 extern int _obstack_memory_used ();
 212 #endif
 213 \f
 214 #if defined __STDC__ && __STDC__
 215
 216 /* Do the function-declarations after the structs
 217    but before defining the macros.  */
 218
 219 void obstack_init (struct obstack *obstack);
 220
 221 void * obstack_alloc (struct obstack *obstack, int size);
 222
 223 void * obstack_copy (struct obstack *obstack, const void *address, int size);
 224 void * obstack_copy0 (struct obstack *obstack, const void *address, int size);
 225
 226 void obstack_free (struct obstack *obstack, void *block);
 227
 228 void obstack_blank (struct obstack *obstack, int size);
 229
 230 void obstack_grow (struct obstack *obstack, const void *data, int size);
 231 void obstack_grow0 (struct obstack *obstack, const void *data, int size);
 232
 233 void obstack_1grow (struct obstack *obstack, int data_char);
 234 void obstack_ptr_grow (struct obstack *obstack, const void *data);
 235 void obstack_int_grow (struct obstack *obstack, int data);
 236
 237 void * obstack_finish (struct obstack *obstack);
 238
 239 int obstack_object_size (struct obstack *obstack);
 240
 241 int obstack_room (struct obstack *obstack);
 242 void obstack_make_room (struct obstack *obstack, int size);
 243 void obstack_1grow_fast (struct obstack *obstack, int data_char);
 244 void obstack_ptr_grow_fast (struct obstack *obstack, const void *data);
 245 void obstack_int_grow_fast (struct obstack *obstack, int data);
 246 void obstack_blank_fast (struct obstack *obstack, int size);
 247
 248 void * obstack_base (struct obstack *obstack);
 249 void * obstack_next_free (struct obstack *obstack);
 250 int obstack_alignment_mask (struct obstack *obstack);
 251 int obstack_chunk_size (struct obstack *obstack);
 252 int obstack_memory_used (struct obstack *obstack);
 253
 254 #endif /* __STDC__ */
 255
 256 /* Non-ANSI C cannot really support alternative functions for these macros,
 257    so we do not declare them.  */
 258
 259 /* Error handler called when `obstack_chunk_alloc' failed to allocate
 260    more memory.  This can be set to a user defined function which
 261    should either abort gracefully or use longjump - but shouldn't
 262    return.  The default action is to print a message and abort.  */
 263 #if defined __STDC__ && __STDC__
 264 extern void (*obstack_alloc_failed_handler) (void);
 265 #else
 266 extern void (*obstack_alloc_failed_handler) ();
 267 #endif
 268
 269 /* Exit value used when `print_and_abort' is used.  */
 270 extern int obstack_exit_failure;
 271 \f
 272 /* Pointer to beginning of object being allocated or to be allocated next.
 273    Note that this might not be the final address of the object
 274    because a new chunk might be needed to hold the final size.  */
 275
 276 #define obstack_base(h) ((h)->object_base)
 277
 278 /* Size for allocating ordinary chunks.  */
 279
 280 #define obstack_chunk_size(h) ((h)->chunk_size)
 281
 282 /* Pointer to next byte not yet allocated in current chunk.  */
 283
 284 #define obstack_next_free(h)    ((h)->next_free)
 285
 286 /* Mask specifying low bits that should be clear in address of an object.  */
 287
 288 #define obstack_alignment_mask(h) ((h)->alignment_mask)
 289
 290 /* To prevent prototype warnings provide complete argument list in
 291    standard C version.  */
 292 #if defined __STDC__ && __STDC__
 293
 294 # define obstack_init(h)                                        \
 295   _obstack_begin ((h), 0, 0,                                    \
 296                   (void *(*) (long)) obstack_chunk_alloc,       \
 297                   (void (*) (void *)) obstack_chunk_free)
 298
 299 # define obstack_begin(h, size)                                 \
 300   _obstack_begin ((h), (size), 0,                               \
 301                   (void *(*) (long)) obstack_chunk_alloc,       \
 302                   (void (*) (void *)) obstack_chunk_free)
 303
 304 # define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \
 305   _obstack_begin ((h), (size), (alignment),                                \
 306                   (void *(*) (long)) (chunkfun),                           \
 307                   (void (*) (void *)) (freefun))
 308
 309 # define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \
 310   _obstack_begin_1 ((h), (size), (alignment),                           \
 311                     (void *(*) (void *, long)) (chunkfun),              \
 312                     (void (*) (void *, void *)) (freefun), (arg))
 313
 314 # define obstack_chunkfun(h, newchunkfun) \
 315   ((h) -> chunkfun = (struct _obstack_chunk *(*)(void *, long)) (newchunkfun))
 316
 317 # define obstack_freefun(h, newfreefun) \
 318   ((h) -> freefun = (void (*)(void *, struct _obstack_chunk *)) (newfreefun))
 319
 320 #else
 321
 322 # define obstack_init(h)                                                \
 323   _obstack_begin ((h), 0, 0,                                            \
 324                   (void *(*) ()) obstack_chunk_alloc,                   \
 325                   (void (*) ()) obstack_chunk_free)
 326
 327 # define obstack_begin(h, size)                                         \
 328   _obstack_begin ((h), (size), 0,                                       \
 329                   (void *(*) ()) obstack_chunk_alloc,                   \
 330                   (void (*) ()) obstack_chunk_free)
 331
 332 # define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \
 333   _obstack_begin ((h), (size), (alignment),                                \
 334                   (void *(*) ()) (chunkfun),                               \
 335                   (void (*) ()) (freefun))
 336
 337 # define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \
 338   _obstack_begin_1 ((h), (size), (alignment),                           \
 339                     (void *(*) ()) (chunkfun),                          \
 340                     (void (*) ()) (freefun), (arg))
 341
 342 # define obstack_chunkfun(h, newchunkfun) \
 343   ((h) -> chunkfun = (struct _obstack_chunk *(*)()) (newchunkfun))
 344
 345 # define obstack_freefun(h, newfreefun) \
 346   ((h) -> freefun = (void (*)()) (newfreefun))
 347
 348 #endif
 349
 350 #define obstack_1grow_fast(h,achar) (*((h)->next_free)++ = achar)
 351
 352 #define obstack_blank_fast(h,n) ((h)->next_free += (n))
 353
 354 #define obstack_memory_used(h) _obstack_memory_used (h)
 355 \f
 356 #if defined __GNUC__ && defined __STDC__ && __STDC__
 357 /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
 358    does not implement __extension__.  But that compiler doesn't define
 359    __GNUC_MINOR__.  */
 360 # if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
 361 #  define __extension__
 362 # endif
 363
 364 /* For GNU C, if not -traditional,
 365    we can define these macros to compute all args only once
 366    without using a global variable.
 367    Also, we can avoid using the `temp' slot, to make faster code.  */
 368
 369 # define obstack_object_size(OBSTACK)                                   \
 370   __extension__                                                         \
 371   ({ struct obstack *__o = (OBSTACK);                                   \
 372      (unsigned) (__o->next_free - __o->object_base); })
 373
 374 # define obstack_room(OBSTACK)                                          \
 375   __extension__                                                         \
 376   ({ struct obstack *__o = (OBSTACK);                                   \
 377      (unsigned) (__o->chunk_limit - __o->next_free); })
 378
 379 # define obstack_make_room(OBSTACK,length)                              \
 380 __extension__                                                           \
 381 ({ struct obstack *__o = (OBSTACK);                                     \
 382    int __len = (length);                                                \
 383    if (__o->chunk_limit - __o->next_free < __len)                       \
 384      _obstack_newchunk (__o, __len);                                    \
 385    (void) 0; })
 386
 387 # define obstack_empty_p(OBSTACK)                                       \
 388   __extension__                                                         \
 389   ({ struct obstack *__o = (OBSTACK);                                   \
 390      (__o->chunk->prev == 0 && __o->next_free - __o->chunk->contents == 0); })
 391
 392 # define obstack_grow(OBSTACK,where,length)                             \
 393 __extension__                                                           \
 394 ({ struct obstack *__o = (OBSTACK);                                     \
 395    int __len = (length);                                                \
 396    if (__o->next_free + __len > __o->chunk_limit)                       \
 397      _obstack_newchunk (__o, __len);                                    \
 398    _obstack_memcpy (__o->next_free, (where), __len);                    \
 399    __o->next_free += __len;                                             \
 400    (void) 0; })
 401
 402 # define obstack_grow0(OBSTACK,where,length)                            \
 403 __extension__                                                           \
 404 ({ struct obstack *__o = (OBSTACK);                                     \
 405    int __len = (length);                                                \
 406    if (__o->next_free + __len + 1 > __o->chunk_limit)                   \
 407      _obstack_newchunk (__o, __len + 1);                                \
 408    _obstack_memcpy (__o->next_free, (where), __len);                    \
 409    __o->next_free += __len;                                             \
 410    *(__o->next_free)++ = 0;                                             \
 411    (void) 0; })
 412
 413 # define obstack_1grow(OBSTACK,datum)                                   \
 414 __extension__                                                           \
 415 ({ struct obstack *__o = (OBSTACK);                                     \
 416    if (__o->next_free + 1 > __o->chunk_limit)                           \
 417      _obstack_newchunk (__o, 1);                                        \
 418    *(__o->next_free)++ = (datum);                                       \
 419    (void) 0; })
 420
 421 /* These assume that the obstack alignment is good enough for pointers
 422    or ints, and that the data added so far to the current object
 423    shares that much alignment.  */
 424
 425 # define obstack_ptr_grow(OBSTACK,datum)                                \
 426 __extension__                                                           \
 427 ({ struct obstack *__o = (OBSTACK);                                     \
 428    if (__o->next_free + sizeof (void *) > __o->chunk_limit)             \
 429      _obstack_newchunk (__o, sizeof (void *));                          \
 430    *((void **)__o->next_free)++ = (datum);                              \
 431    (void) 0; })
 432
 433 # define obstack_int_grow(OBSTACK,datum)                                \
 434 __extension__                                                           \
 435 ({ struct obstack *__o = (OBSTACK);                                     \
 436    if (__o->next_free + sizeof (int) > __o->chunk_limit)                \
 437      _obstack_newchunk (__o, sizeof (int));                             \
 438    *((int *)__o->next_free)++ = (datum);                                \
 439    (void) 0; })
 440
 441 # define obstack_ptr_grow_fast(h,aptr)                                  \
 442   (*((void **) (h)->next_free)++ = (aptr))
 443
 444 # define obstack_int_grow_fast(h,aint)                                  \
 445   (*((int *) (h)->next_free)++ = (aint))
 446
 447 # define obstack_blank(OBSTACK,length)                                  \
 448 __extension__                                                           \
 449 ({ struct obstack *__o = (OBSTACK);                                     \
 450    int __len = (length);                                                \
 451    if (__o->chunk_limit - __o->next_free < __len)                       \
 452      _obstack_newchunk (__o, __len);                                    \
 453    __o->next_free += __len;                                             \
 454    (void) 0; })
 455
 456 # define obstack_alloc(OBSTACK,length)                                  \
 457 __extension__                                                           \
 458 ({ struct obstack *__h = (OBSTACK);                                     \
 459    obstack_blank (__h, (length));                                       \
 460    obstack_finish (__h); })
 461
 462 # define obstack_copy(OBSTACK,where,length)                             \
 463 __extension__                                                           \
 464 ({ struct obstack *__h = (OBSTACK);                                     \
 465    obstack_grow (__h, (where), (length));                               \
 466    obstack_finish (__h); })
 467
 468 # define obstack_copy0(OBSTACK,where,length)                            \
 469 __extension__                                                           \
 470 ({ struct obstack *__h = (OBSTACK);                                     \
 471    obstack_grow0 (__h, (where), (length));                              \
 472    obstack_finish (__h); })
 473
 474 /* The local variable is named __o1 to avoid a name conflict
 475    when obstack_blank is called.  */
 476 # define obstack_finish(OBSTACK)                                        \
 477 __extension__                                                           \
 478 ({ struct obstack *__o1 = (OBSTACK);                                    \
 479    void *value;                                                         \
 480    value = (void *) __o1->object_base;                                  \
 481    if (__o1->next_free == value)                                        \
 482      __o1->maybe_empty_object = 1;                                      \
 483    __o1->next_free                                                      \
 484      = __INT_TO_PTR ((__PTR_TO_INT (__o1->next_free)+__o1->alignment_mask)\
 485                      & ~ (__o1->alignment_mask));                       \
 486    if (__o1->next_free - (char *)__o1->chunk                            \
 487        > __o1->chunk_limit - (char *)__o1->chunk)                       \
 488      __o1->next_free = __o1->chunk_limit;                               \
 489    __o1->object_base = __o1->next_free;                                 \
 490    value; })
 491
 492 # define obstack_free(OBSTACK, OBJ)                                     \
 493 __extension__                                                           \
 494 ({ struct obstack *__o = (OBSTACK);                                     \
 495    void *__obj = (OBJ);                                                 \
 496    if (__obj > (void *)__o->chunk && __obj < (void *)__o->chunk_limit)  \
 497      __o->next_free = __o->object_base = (char *)__obj;                 \
 498    else (obstack_free) (__o, __obj); })
 499 \f
 500 #else /* not __GNUC__ or not __STDC__ */
 501
 502 # define obstack_object_size(h) \
 503  (unsigned) ((h)->next_free - (h)->object_base)
 504
 505 # define obstack_room(h)                \
 506  (unsigned) ((h)->chunk_limit - (h)->next_free)
 507
 508 # define obstack_empty_p(h) \
 509  ((h)->chunk->prev == 0 && (h)->next_free - (h)->chunk->contents == 0)
 510
 511 /* Note that the call to _obstack_newchunk is enclosed in (..., 0)
 512    so that we can avoid having void expressions
 513    in the arms of the conditional expression.
 514    Casting the third operand to void was tried before,
 515    but some compilers won't accept it.  */
 516
 517 # define obstack_make_room(h,length)                                    \
 518 ( (h)->temp = (length),                                                 \
 519   (((h)->next_free + (h)->temp > (h)->chunk_limit)                      \
 520    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0))
 521
 522 # define obstack_grow(h,where,length)                                   \
 523 ( (h)->temp = (length),                                                 \
 524   (((h)->next_free + (h)->temp > (h)->chunk_limit)                      \
 525    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0),                      \
 526   _obstack_memcpy ((h)->next_free, (where), (h)->temp),                 \
 527   (h)->next_free += (h)->temp)
 528
 529 # define obstack_grow0(h,where,length)                                  \
 530 ( (h)->temp = (length),                                                 \
 531   (((h)->next_free + (h)->temp + 1 > (h)->chunk_limit)                  \
 532    ? (_obstack_newchunk ((h), (h)->temp + 1), 0) : 0),                  \
 533   _obstack_memcpy ((h)->next_free, (where), (h)->temp),                 \
 534   (h)->next_free += (h)->temp,                                          \
 535   *((h)->next_free)++ = 0)
 536
 537 # define obstack_1grow(h,datum)                                         \
 538 ( (((h)->next_free + 1 > (h)->chunk_limit)                              \
 539    ? (_obstack_newchunk ((h), 1), 0) : 0),                              \
 540   (*((h)->next_free)++ = (datum)))
 541
 542 # define obstack_ptr_grow(h,datum)                                      \
 543 ( (((h)->next_free + sizeof (char *) > (h)->chunk_limit)                \
 544    ? (_obstack_newchunk ((h), sizeof (char *)), 0) : 0),                \
 545   (*((const char **) (((h)->next_free+=sizeof(char *))-sizeof(char *))) = (datum)))
 546
 547 # define obstack_int_grow(h,datum)                                      \
 548 ( (((h)->next_free + sizeof (int) > (h)->chunk_limit)                   \
 549    ? (_obstack_newchunk ((h), sizeof (int)), 0) : 0),                   \
 550   (*((int *) (((h)->next_free+=sizeof(int))-sizeof(int))) = (datum)))
 551
 552 # define obstack_ptr_grow_fast(h,aptr)                                  \
 553   (*((const char **) (h)->next_free)++ = (aptr))
 554
 555 # define obstack_int_grow_fast(h,aint)                                  \
 556   (*((int *) (h)->next_free)++ = (aint))
 557
 558 # define obstack_blank(h,length)                                        \
 559 ( (h)->temp = (length),                                                 \
 560   (((h)->chunk_limit - (h)->next_free < (h)->temp)                      \
 561    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0),                      \
 562   ((h)->next_free += (h)->temp))
 563
 564 # define obstack_alloc(h,length)                                        \
 565  (obstack_blank ((h), (length)), obstack_finish ((h)))
 566
 567 # define obstack_copy(h,where,length)                                   \
 568  (obstack_grow ((h), (where), (length)), obstack_finish ((h)))
 569
 570 # define obstack_copy0(h,where,length)                                  \
 571  (obstack_grow0 ((h), (where), (length)), obstack_finish ((h)))
 572
 573 # define obstack_finish(h)                                              \
 574 ( ((h)->next_free == (h)->object_base                                   \
 575    ? (((h)->maybe_empty_object = 1), 0)                                 \
 576    : 0),                                                                \
 577   (h)->temp = __PTR_TO_INT ((h)->object_base),                          \
 578   (h)->next_free                                                        \
 579     = __INT_TO_PTR ((__PTR_TO_INT ((h)->next_free)+(h)->alignment_mask) \
 580                     & ~ ((h)->alignment_mask)),                         \
 581   (((h)->next_free - (char *) (h)->chunk                                \
 582     > (h)->chunk_limit - (char *) (h)->chunk)                           \
 583    ? ((h)->next_free = (h)->chunk_limit) : 0),                          \
 584   (h)->object_base = (h)->next_free,                                    \
 585   __INT_TO_PTR ((h)->temp))
 586
 587 # if defined __STDC__ && __STDC__
 588 #  define obstack_free(h,obj)                                           \
 589 ( (h)->temp = (char *) (obj) - (char *) (h)->chunk,                     \
 590   (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\
 591    ? (int) ((h)->next_free = (h)->object_base                           \
 592             = (h)->temp + (char *) (h)->chunk)                          \
 593    : (((obstack_free) ((h), (h)->temp + (char *) (h)->chunk), 0), 0)))
 594 # else
 595 #  define obstack_free(h,obj)                                           \
 596 ( (h)->temp = (char *) (obj) - (char *) (h)->chunk,                     \
 597   (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\
 598    ? (int) ((h)->next_free = (h)->object_base                           \
 599             = (h)->temp + (char *) (h)->chunk)                          \
 600    : (_obstack_free ((h), (h)->temp + (char *) (h)->chunk), 0)))
 601 # endif
 602
 603 #endif /* not __GNUC__ or not __STDC__ */
 604
 605 #ifdef __cplusplus
 606 }       /* C++ */
 607 #endif
 608
 609 #endif /* obstack.h */