include/obstack.h

   1 /* obstack.h - object stack macros
   2    Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2008
   4    Free Software Foundation, Inc.
   5
   6
   7    NOTE: The canonical source of this file is maintained with the GNU C Library.
   8    Bugs can be reported to bug-glibc@gnu.org.
   9
  10    This program is free software; you can redistribute it and/or modify it
  11    under the terms of the GNU General Public License as published by the
  12    Free Software Foundation; either version 2, or (at your option) any
  13    later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
  23    USA.  */
  24
  25 /* Summary:
  26
  27 All the apparent functions defined here are macros. The idea
  28 is that you would use these pre-tested macros to solve a
  29 very specific set of problems, and they would run fast.
  30 Caution: no side-effects in arguments please!! They may be
  31 evaluated MANY times!!
  32
  33 These macros operate a stack of objects.  Each object starts life
  34 small, and may grow to maturity.  (Consider building a word syllable
  35 by syllable.)  An object can move while it is growing.  Once it has
  36 been "finished" it never changes address again.  So the "top of the
  37 stack" is typically an immature growing object, while the rest of the
  38 stack is of mature, fixed size and fixed address objects.
  39
  40 These routines grab large chunks of memory, using a function you
  41 supply, called `obstack_chunk_alloc'.  On occasion, they free chunks,
  42 by calling `obstack_chunk_free'.  You must define them and declare
  43 them before using any obstack macros.
  44
  45 Each independent stack is represented by a `struct obstack'.
  46 Each of the obstack macros expects a pointer to such a structure
  47 as the first argument.
  48
  49 One motivation for this package is the problem of growing char strings
  50 in symbol tables.  Unless you are "fascist pig with a read-only mind"
  51 --Gosper's immortal quote from HAKMEM item 154, out of context--you
  52 would not like to put any arbitrary upper limit on the length of your
  53 symbols.
  54
  55 In practice this often means you will build many short symbols and a
  56 few long symbols.  At the time you are reading a symbol you don't know
  57 how long it is.  One traditional method is to read a symbol into a
  58 buffer, realloc()ating the buffer every time you try to read a symbol
  59 that is longer than the buffer.  This is beaut, but you still will
  60 want to copy the symbol from the buffer to a more permanent
  61 symbol-table entry say about half the time.
  62
  63 With obstacks, you can work differently.  Use one obstack for all symbol
  64 names.  As you read a symbol, grow the name in the obstack gradually.
  65 When the name is complete, finalize it.  Then, if the symbol exists already,
  66 free the newly read name.
  67
  68 The way we do this is to take a large chunk, allocating memory from
  69 low addresses.  When you want to build a symbol in the chunk you just
  70 add chars above the current "high water mark" in the chunk.  When you
  71 have finished adding chars, because you got to the end of the symbol,
  72 you know how long the chars are, and you can create a new object.
  73 Mostly the chars will not burst over the highest address of the chunk,
  74 because you would typically expect a chunk to be (say) 100 times as
  75 long as an average object.
  76
  77 In case that isn't clear, when we have enough chars to make up
  78 the object, THEY ARE ALREADY CONTIGUOUS IN THE CHUNK (guaranteed)
  79 so we just point to it where it lies.  No moving of chars is
  80 needed and this is the second win: potentially long strings need
  81 never be explicitly shuffled. Once an object is formed, it does not
  82 change its address during its lifetime.
  83
  84 When the chars burst over a chunk boundary, we allocate a larger
  85 chunk, and then copy the partly formed object from the end of the old
  86 chunk to the beginning of the new larger chunk.  We then carry on
  87 accreting characters to the end of the object as we normally would.
  88
  89 A special macro is provided to add a single char at a time to a
  90 growing object.  This allows the use of register variables, which
  91 break the ordinary 'growth' macro.
  92
  93 Summary:
  94         We allocate large chunks.
  95         We carve out one object at a time from the current chunk.
  96         Once carved, an object never moves.
  97         We are free to append data of any size to the currently
  98           growing object.
  99         Exactly one object is growing in an obstack at any one time.
 100         You can run one obstack per control block.
 101         You may have as many control blocks as you dare.
 102         Because of the way we do it, you can `unwind' an obstack
 103           back to a previous state. (You may remove objects much
 104           as you would with a stack.)
 105 */
 106
 107
 108 /* Don't do the contents of this file more than once.  */
 109
 110 #ifndef _OBSTACK_H
 111 #define _OBSTACK_H 1
 112
 113 #ifdef __cplusplus
 114 extern "C" {
 115 #endif
 116 \f
 117 /* We use subtraction of (char *) 0 instead of casting to int
 118    because on word-addressable machines a simple cast to int
 119    may ignore the byte-within-word field of the pointer.  */
 120
 121 #ifndef __PTR_TO_INT
 122 # define __PTR_TO_INT(P) ((P) - (char *) 0)
 123 #endif
 124
 125 #ifndef __INT_TO_PTR
 126 # define __INT_TO_PTR(P) ((P) + (char *) 0)
 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), (char *)(From), (N))
 152 # else
 153 #  define _obstack_memcpy(To, From, N) bcopy ((char *)(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   /* These prototypes vary based on `use_extra_arg', and we use
 174      casts to the prototypeless function type in all assignments,
 175      but having prototypes here quiets -Wstrict-prototypes.  */
 176   struct _obstack_chunk *(*chunkfun) (void *, long);
 177   void (*freefun) (void *, struct _obstack_chunk *);
 178   void *extra_arg;              /* first arg for chunk alloc/dealloc funcs */
 179   unsigned use_extra_arg:1;     /* chunk alloc/dealloc funcs take extra arg */
 180   unsigned maybe_empty_object:1;/* There is a possibility that the current
 181                                    chunk contains a zero-length object.  This
 182                                    prevents freeing the chunk if we allocate
 183                                    a bigger chunk to replace it. */
 184   unsigned alloc_failed:1;      /* No longer used, as we now call the failed
 185                                    handler on error, but retained for binary
 186                                    compatibility.  */
 187 };
 188
 189 /* Declare the external functions we use; they are in obstack.c.  */
 190
 191 extern void _obstack_newchunk (struct obstack *, int);
 192 extern void _obstack_free (struct obstack *, void *);
 193 extern int _obstack_begin (struct obstack *, int, int,
 194                             void *(*) (long), void (*) (void *));
 195 extern int _obstack_begin_1 (struct obstack *, int, int,
 196                              void *(*) (void *, long),
 197                              void (*) (void *, void *), void *);
 198 extern int _obstack_memory_used (struct obstack *);
 199 \f
 200 /* Do the function-declarations after the structs
 201    but before defining the macros.  */
 202
 203 void obstack_init (struct obstack *obstack);
 204
 205 void * obstack_alloc (struct obstack *obstack, int size);
 206
 207 void * obstack_copy (struct obstack *obstack, void *address, int size);
 208 void * obstack_copy0 (struct obstack *obstack, void *address, int size);
 209
 210 void obstack_free (struct obstack *obstack, void *block);
 211
 212 void obstack_blank (struct obstack *obstack, int size);
 213
 214 void obstack_grow (struct obstack *obstack, void *data, int size);
 215 void obstack_grow0 (struct obstack *obstack, void *data, int size);
 216
 217 void obstack_1grow (struct obstack *obstack, int data_char);
 218 void obstack_ptr_grow (struct obstack *obstack, void *data);
 219 void obstack_int_grow (struct obstack *obstack, int data);
 220
 221 void * obstack_finish (struct obstack *obstack);
 222
 223 int obstack_object_size (struct obstack *obstack);
 224
 225 int obstack_room (struct obstack *obstack);
 226 void obstack_make_room (struct obstack *obstack, int size);
 227 void obstack_1grow_fast (struct obstack *obstack, int data_char);
 228 void obstack_ptr_grow_fast (struct obstack *obstack, void *data);
 229 void obstack_int_grow_fast (struct obstack *obstack, int data);
 230 void obstack_blank_fast (struct obstack *obstack, int size);
 231
 232 void * obstack_base (struct obstack *obstack);
 233 void * obstack_next_free (struct obstack *obstack);
 234 int obstack_alignment_mask (struct obstack *obstack);
 235 int obstack_chunk_size (struct obstack *obstack);
 236 int obstack_memory_used (struct obstack *obstack);
 237
 238 /* Error handler called when `obstack_chunk_alloc' failed to allocate
 239    more memory.  This can be set to a user defined function.  The
 240    default action is to print a message and abort.  */
 241 extern void (*obstack_alloc_failed_handler) (void);
 242
 243 /* Exit value used when `print_and_abort' is used.  */
 244 extern int obstack_exit_failure;
 245 \f
 246 /* Pointer to beginning of object being allocated or to be allocated next.
 247    Note that this might not be the final address of the object
 248    because a new chunk might be needed to hold the final size.  */
 249
 250 #define obstack_base(h) ((h)->object_base)
 251
 252 /* Size for allocating ordinary chunks.  */
 253
 254 #define obstack_chunk_size(h) ((h)->chunk_size)
 255
 256 /* Pointer to next byte not yet allocated in current chunk.  */
 257
 258 #define obstack_next_free(h)    ((h)->next_free)
 259
 260 /* Mask specifying low bits that should be clear in address of an object.  */
 261
 262 #define obstack_alignment_mask(h) ((h)->alignment_mask)
 263
 264 /* To prevent prototype warnings provide complete argument list in
 265    standard C version.  */
 266 # define obstack_init(h) \
 267   _obstack_begin ((h), 0, 0, \
 268                   (void *(*) (long)) obstack_chunk_alloc, (void (*) (void *)) obstack_chunk_free)
 269
 270 # define obstack_begin(h, size) \
 271   _obstack_begin ((h), (size), 0, \
 272                   (void *(*) (long)) obstack_chunk_alloc, (void (*) (void *)) obstack_chunk_free)
 273
 274 # define obstack_specify_allocation(h, size, alignment, chunkfun, freefun) \
 275   _obstack_begin ((h), (size), (alignment), \
 276                     (void *(*) (long)) (chunkfun), (void (*) (void *)) (freefun))
 277
 278 # define obstack_specify_allocation_with_arg(h, size, alignment, chunkfun, freefun, arg) \
 279   _obstack_begin_1 ((h), (size), (alignment), \
 280                     (void *(*) (void *, long)) (chunkfun), \
 281                     (void (*) (void *, void *)) (freefun), (arg))
 282
 283 # define obstack_chunkfun(h, newchunkfun) \
 284   ((h) -> chunkfun = (struct _obstack_chunk *(*)(void *, long)) (newchunkfun))
 285
 286 # define obstack_freefun(h, newfreefun) \
 287   ((h) -> freefun = (void (*)(void *, struct _obstack_chunk *)) (newfreefun))
 288
 289 #define obstack_1grow_fast(h,achar) (*((h)->next_free)++ = (achar))
 290
 291 #define obstack_blank_fast(h,n) ((h)->next_free += (n))
 292
 293 #define obstack_memory_used(h) _obstack_memory_used (h)
 294 \f
 295 #if defined __GNUC__ && defined __STDC__ && __STDC__
 296 /* NextStep 2.0 cc is really gcc 1.93 but it defines __GNUC__ = 2 and
 297    does not implement __extension__.  But that compiler doesn't define
 298    __GNUC_MINOR__.  */
 299 # if __GNUC__ < 2 || (__NeXT__ && !__GNUC_MINOR__)
 300 #  define __extension__
 301 # endif
 302
 303 /* For GNU C, if not -traditional,
 304    we can define these macros to compute all args only once
 305    without using a global variable.
 306    Also, we can avoid using the `temp' slot, to make faster code.  */
 307
 308 # define obstack_object_size(OBSTACK)                                   \
 309   __extension__                                                         \
 310   ({ struct obstack *__o = (OBSTACK);                                   \
 311      (unsigned) (__o->next_free - __o->object_base); })
 312
 313 # define obstack_room(OBSTACK)                                          \
 314   __extension__                                                         \
 315   ({ struct obstack *__o = (OBSTACK);                                   \
 316      (unsigned) (__o->chunk_limit - __o->next_free); })
 317
 318 # define obstack_make_room(OBSTACK,length)                              \
 319 __extension__                                                           \
 320 ({ struct obstack *__o = (OBSTACK);                                     \
 321    int __len = (length);                                                \
 322    if (__o->chunk_limit - __o->next_free < __len)                       \
 323      _obstack_newchunk (__o, __len);                                    \
 324    (void) 0; })
 325
 326 # define obstack_empty_p(OBSTACK)                                       \
 327   __extension__                                                         \
 328   ({ struct obstack *__o = (OBSTACK);                                   \
 329      (__o->chunk->prev == 0 && __o->next_free - __o->chunk->contents == 0); })
 330
 331 # define obstack_grow(OBSTACK,where,length)                             \
 332 __extension__                                                           \
 333 ({ struct obstack *__o = (OBSTACK);                                     \
 334    int __len = (length);                                                \
 335    if (__o->next_free + __len > __o->chunk_limit)                       \
 336      _obstack_newchunk (__o, __len);                                    \
 337    _obstack_memcpy (__o->next_free, (where), __len);                    \
 338    __o->next_free += __len;                                             \
 339    (void) 0; })
 340
 341 # define obstack_grow0(OBSTACK,where,length)                            \
 342 __extension__                                                           \
 343 ({ struct obstack *__o = (OBSTACK);                                     \
 344    int __len = (length);                                                \
 345    if (__o->next_free + __len + 1 > __o->chunk_limit)                   \
 346      _obstack_newchunk (__o, __len + 1);                                \
 347    _obstack_memcpy (__o->next_free, (where), __len);                    \
 348    __o->next_free += __len;                                             \
 349    *(__o->next_free)++ = 0;                                             \
 350    (void) 0; })
 351
 352 # define obstack_1grow(OBSTACK,datum)                                   \
 353 __extension__                                                           \
 354 ({ struct obstack *__o = (OBSTACK);                                     \
 355    if (__o->next_free + 1 > __o->chunk_limit)                           \
 356      _obstack_newchunk (__o, 1);                                        \
 357    obstack_1grow_fast (__o, datum);                                     \
 358    (void) 0; })
 359
 360 /* These assume that the obstack alignment is good enough for pointers or ints,
 361    and that the data added so far to the current object
 362    shares that much alignment.  */
 363
 364 # define obstack_ptr_grow(OBSTACK,datum)                                \
 365 __extension__                                                           \
 366 ({ struct obstack *__o = (OBSTACK);                                     \
 367    if (__o->next_free + sizeof (void *) > __o->chunk_limit)             \
 368      _obstack_newchunk (__o, sizeof (void *));                          \
 369    obstack_ptr_grow_fast (__o, datum); })
 370
 371 # define obstack_int_grow(OBSTACK,datum)                                \
 372 __extension__                                                           \
 373 ({ struct obstack *__o = (OBSTACK);                                     \
 374    if (__o->next_free + sizeof (int) > __o->chunk_limit)                \
 375      _obstack_newchunk (__o, sizeof (int));                             \
 376    obstack_int_grow_fast (__o, datum); })
 377
 378 # define obstack_ptr_grow_fast(OBSTACK,aptr)                            \
 379 __extension__                                                           \
 380 ({ struct obstack *__o1 = (OBSTACK);                                    \
 381    *(const void **) __o1->next_free = (aptr);                           \
 382    __o1->next_free += sizeof (const void *);                            \
 383    (void) 0; })
 384
 385 # define obstack_int_grow_fast(OBSTACK,aint)                            \
 386 __extension__                                                           \
 387 ({ struct obstack *__o1 = (OBSTACK);                                    \
 388    *(int *) __o1->next_free = (aint);                                   \
 389    __o1->next_free += sizeof (int);                                     \
 390    (void) 0; })
 391
 392 # define obstack_blank(OBSTACK,length)                                  \
 393 __extension__                                                           \
 394 ({ struct obstack *__o = (OBSTACK);                                     \
 395    int __len = (length);                                                \
 396    if (__o->chunk_limit - __o->next_free < __len)                       \
 397      _obstack_newchunk (__o, __len);                                    \
 398    obstack_blank_fast (__o, __len);                                     \
 399    (void) 0; })
 400
 401 # define obstack_alloc(OBSTACK,length)                                  \
 402 __extension__                                                           \
 403 ({ struct obstack *__h = (OBSTACK);                                     \
 404    obstack_blank (__h, (length));                                       \
 405    obstack_finish (__h); })
 406
 407 # define obstack_copy(OBSTACK,where,length)                             \
 408 __extension__                                                           \
 409 ({ struct obstack *__h = (OBSTACK);                                     \
 410    obstack_grow (__h, (where), (length));                               \
 411    obstack_finish (__h); })
 412
 413 # define obstack_copy0(OBSTACK,where,length)                            \
 414 __extension__                                                           \
 415 ({ struct obstack *__h = (OBSTACK);                                     \
 416    obstack_grow0 (__h, (where), (length));                              \
 417    obstack_finish (__h); })
 418
 419 /* The local variable is named __o1 to avoid a name conflict
 420    when obstack_blank is called.  */
 421 # define obstack_finish(OBSTACK)                                        \
 422 __extension__                                                           \
 423 ({ struct obstack *__o1 = (OBSTACK);                                    \
 424    void *value;                                                         \
 425    value = (void *) __o1->object_base;                                  \
 426    if (__o1->next_free == value)                                        \
 427      __o1->maybe_empty_object = 1;                                      \
 428    __o1->next_free                                                      \
 429      = __INT_TO_PTR ((__PTR_TO_INT (__o1->next_free)+__o1->alignment_mask)\
 430                      & ~ (__o1->alignment_mask));                       \
 431    if (__o1->next_free - (char *)__o1->chunk                            \
 432        > __o1->chunk_limit - (char *)__o1->chunk)                       \
 433      __o1->next_free = __o1->chunk_limit;                               \
 434    __o1->object_base = __o1->next_free;                                 \
 435    value; })
 436
 437 # define obstack_free(OBSTACK, OBJ)                                     \
 438 __extension__                                                           \
 439 ({ struct obstack *__o = (OBSTACK);                                     \
 440    void *__obj = (void *) (OBJ);                                        \
 441    if (__obj > (void *)__o->chunk && __obj < (void *)__o->chunk_limit)  \
 442      __o->next_free = __o->object_base = (char *) __obj;                \
 443    else (obstack_free) (__o, __obj); })
 444 \f
 445 #else /* not __GNUC__ or not __STDC__ */
 446
 447 # define obstack_object_size(h) \
 448  (unsigned) ((h)->next_free - (h)->object_base)
 449
 450 # define obstack_room(h)                \
 451  (unsigned) ((h)->chunk_limit - (h)->next_free)
 452
 453 # define obstack_empty_p(h) \
 454  ((h)->chunk->prev == 0 && (h)->next_free - (h)->chunk->contents == 0)
 455
 456 /* Note that the call to _obstack_newchunk is enclosed in (..., 0)
 457    so that we can avoid having void expressions
 458    in the arms of the conditional expression.
 459    Casting the third operand to void was tried before,
 460    but some compilers won't accept it.  */
 461
 462 # define obstack_make_room(h,length)                                    \
 463 ( (h)->temp = (length),                                                 \
 464   (((h)->next_free + (h)->temp > (h)->chunk_limit)                      \
 465    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0))
 466
 467 # define obstack_grow(h,where,length)                                   \
 468 ( (h)->temp = (length),                                                 \
 469   (((h)->next_free + (h)->temp > (h)->chunk_limit)                      \
 470    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0),                      \
 471   _obstack_memcpy ((h)->next_free, (where), (h)->temp),                 \
 472   (h)->next_free += (h)->temp)
 473
 474 # define obstack_grow0(h,where,length)                                  \
 475 ( (h)->temp = (length),                                                 \
 476   (((h)->next_free + (h)->temp + 1 > (h)->chunk_limit)                  \
 477    ? (_obstack_newchunk ((h), (h)->temp + 1), 0) : 0),                  \
 478   _obstack_memcpy ((h)->next_free, (where), (h)->temp),                 \
 479   (h)->next_free += (h)->temp,                                          \
 480   *((h)->next_free)++ = 0)
 481
 482 # define obstack_1grow(h,datum)                                         \
 483 ( (((h)->next_free + 1 > (h)->chunk_limit)                              \
 484    ? (_obstack_newchunk ((h), 1), 0) : 0),                              \
 485   obstack_1grow_fast (h, datum))
 486
 487 # define obstack_ptr_grow(h,datum)                                      \
 488 ( (((h)->next_free + sizeof (char *) > (h)->chunk_limit)                \
 489    ? (_obstack_newchunk ((h), sizeof (char *)), 0) : 0),                \
 490   obstack_ptr_grow_fast (h, datum))
 491
 492 # define obstack_int_grow(h,datum)                                      \
 493 ( (((h)->next_free + sizeof (int) > (h)->chunk_limit)                   \
 494    ? (_obstack_newchunk ((h), sizeof (int)), 0) : 0),                   \
 495   obstack_int_grow_fast (h, datum))
 496
 497 # define obstack_ptr_grow_fast(h,aptr)                                  \
 498   (((const void **) ((h)->next_free += sizeof (void *)))[-1] = (aptr))
 499
 500 # define obstack_int_grow_fast(h,aint)                                  \
 501   (((int *) ((h)->next_free += sizeof (int)))[-1] = (aptr))
 502
 503 # define obstack_blank(h,length)                                        \
 504 ( (h)->temp = (length),                                                 \
 505   (((h)->chunk_limit - (h)->next_free < (h)->temp)                      \
 506    ? (_obstack_newchunk ((h), (h)->temp), 0) : 0),                      \
 507   obstack_blank_fast (h, (h)->temp))
 508
 509 # define obstack_alloc(h,length)                                        \
 510  (obstack_blank ((h), (length)), obstack_finish ((h)))
 511
 512 # define obstack_copy(h,where,length)                                   \
 513  (obstack_grow ((h), (where), (length)), obstack_finish ((h)))
 514
 515 # define obstack_copy0(h,where,length)                                  \
 516  (obstack_grow0 ((h), (where), (length)), obstack_finish ((h)))
 517
 518 # define obstack_finish(h)                                              \
 519 ( ((h)->next_free == (h)->object_base                                   \
 520    ? (((h)->maybe_empty_object = 1), 0)                                 \
 521    : 0),                                                                \
 522   (h)->temp = __PTR_TO_INT ((h)->object_base),                          \
 523   (h)->next_free                                                        \
 524     = __INT_TO_PTR ((__PTR_TO_INT ((h)->next_free)+(h)->alignment_mask) \
 525                     & ~ ((h)->alignment_mask)),                         \
 526   (((h)->next_free - (char *) (h)->chunk                                \
 527     > (h)->chunk_limit - (char *) (h)->chunk)                           \
 528    ? ((h)->next_free = (h)->chunk_limit) : 0),                          \
 529   (h)->object_base = (h)->next_free,                                    \
 530   (void *) __INT_TO_PTR ((h)->temp))
 531
 532 # define obstack_free(h,obj)                                            \
 533 ( (h)->temp = (char *) (obj) - (char *) (h)->chunk,                     \
 534   (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\
 535    ? (((h)->next_free = (h)->object_base                                \
 536             = (h)->temp + (char *) (h)->chunk), 0)                      \
 537    : ((obstack_free) ((h), (h)->temp + (char *) (h)->chunk), 0)))
 538
 539 #endif /* not __GNUC__ or not __STDC__ */
 540
 541 #ifdef __cplusplus
 542 }       /* C++ */
 543 #endif
 544
 545 #endif /* obstack.h */