From 68fd92338ec22e17555dcee2b9a0364cd874bbd2 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Thu, 20 May 2004 06:49:52 +0000 Subject: Update from gnulib. --- lib/obstack.h | 130 +++++++++++++++++++++++----------------------------------- 1 file changed, 52 insertions(+), 78 deletions(-) (limited to 'lib/obstack.h') diff --git a/lib/obstack.h b/lib/obstack.h index 028dc166f..c4140ad29 100644 --- a/lib/obstack.h +++ b/lib/obstack.h @@ -113,19 +113,7 @@ Summary: extern "C" { #endif -/* We use subtraction of (char *) 0 instead of casting to int - because on word-addressable machines a simple cast to int - may ignore the byte-within-word field of the pointer. */ - -#ifndef __PTR_TO_INT -# define __PTR_TO_INT(P) ((P) - (char *) 0) -#endif - -#ifndef __INT_TO_PTR -# define __INT_TO_PTR(P) ((P) + (char *) 0) -#endif - -/* We need the type of the resulting object. If __PTRDIFF_TYPE__ is +/* We need the type of a pointer subtraction. If __PTRDIFF_TYPE__ is defined, as with GNU C, use that; that way we don't pollute the namespace with 's symbols. Otherwise, include and use ptrdiff_t. */ @@ -137,6 +125,23 @@ extern "C" { # define PTR_INT_TYPE ptrdiff_t #endif +/* If B is the base of an object addressed by P, return the result of + aligning P to the next multiple of A + 1. B and P must be of type + char *. A + 1 must be a power of 2. */ + +#define __BPTR_ALIGN(B, P, A) ((B) + (((P) - (B) + (A)) & ~(A))) + +/* Similiar to _BPTR_ALIGN (B, P, A), except optimize the common case + where pointers can be converted to integers, aligned as integers, + and converted back again. If PTR_INT_TYPE is narrower than a + pointer (e.g., the AS/400), play it safe and compute the alignment + relative to B. Otherwise, use the faster strategy of computing the + alignment relative to 0. */ + +#define __PTR_ALIGN(B, P, A) \ + __BPTR_ALIGN (sizeof (PTR_INT_TYPE) < sizeof (void *) ? (B) : (char *) 0, \ + P, A) + #include struct _obstack_chunk /* Lives at front of each chunk. */ @@ -153,7 +158,11 @@ struct obstack /* control current object in current chunk */ char *object_base; /* address of object we are building */ char *next_free; /* where to add next char to current object */ char *chunk_limit; /* address of char after current chunk */ - PTR_INT_TYPE temp; /* Temporary for some macros. */ + union + { + PTR_INT_TYPE tempint; + void *tempptr; + } temp; /* Temporary for some macros. */ int alignment_mask; /* Mask of alignment for each object. */ /* These prototypes vary based on `use_extra_arg', and we use casts to the prototypeless function type in all assignments, @@ -174,52 +183,16 @@ struct obstack /* control current object in current chunk */ /* Declare the external functions we use; they are in obstack.c. */ extern void _obstack_newchunk (struct obstack *, int); -extern void _obstack_free (struct obstack *, void *); extern int _obstack_begin (struct obstack *, int, int, void *(*) (long), void (*) (void *)); extern int _obstack_begin_1 (struct obstack *, int, int, void *(*) (void *, long), void (*) (void *, void *), void *); extern int _obstack_memory_used (struct obstack *); - -/* Do the function-declarations after the structs - but before defining the macros. */ - -void obstack_init (struct obstack *obstack); - -void * obstack_alloc (struct obstack *obstack, int size); - -void * obstack_copy (struct obstack *obstack, const void *address, int size); -void * obstack_copy0 (struct obstack *obstack, const void *address, int size); void obstack_free (struct obstack *obstack, void *block); -void obstack_blank (struct obstack *obstack, int size); - -void obstack_grow (struct obstack *obstack, const void *data, int size); -void obstack_grow0 (struct obstack *obstack, const void *data, int size); - -void obstack_1grow (struct obstack *obstack, int data_char); -void obstack_ptr_grow (struct obstack *obstack, const void *data); -void obstack_int_grow (struct obstack *obstack, int data); - -void * obstack_finish (struct obstack *obstack); - -int obstack_object_size (struct obstack *obstack); - -int obstack_room (struct obstack *obstack); -void obstack_make_room (struct obstack *obstack, int size); -void obstack_1grow_fast (struct obstack *obstack, int data_char); -void obstack_ptr_grow_fast (struct obstack *obstack, const void *data); -void obstack_int_grow_fast (struct obstack *obstack, int data); -void obstack_blank_fast (struct obstack *obstack, int size); - -void * obstack_base (struct obstack *obstack); -void * obstack_next_free (struct obstack *obstack); -int obstack_alignment_mask (struct obstack *obstack); -int obstack_chunk_size (struct obstack *obstack); -int obstack_memory_used (struct obstack *obstack); - + /* Error handler called when `obstack_chunk_alloc' failed to allocate more memory. This can be set to a user defined function which should either abort gracefully or use longjump - but shouldn't @@ -413,8 +386,8 @@ __extension__ \ if (__o1->next_free == __value) \ __o1->maybe_empty_object = 1; \ __o1->next_free \ - = __INT_TO_PTR ((__PTR_TO_INT (__o1->next_free)+__o1->alignment_mask)\ - & ~ (__o1->alignment_mask)); \ + = __PTR_ALIGN (__o1->object_base, __o1->next_free, \ + __o1->alignment_mask); \ if (__o1->next_free - (char *)__o1->chunk \ > __o1->chunk_limit - (char *)__o1->chunk) \ __o1->next_free = __o1->chunk_limit; \ @@ -447,23 +420,23 @@ __extension__ \ but some compilers won't accept it. */ # define obstack_make_room(h,length) \ -( (h)->temp = (length), \ - (((h)->next_free + (h)->temp > (h)->chunk_limit) \ - ? (_obstack_newchunk ((h), (h)->temp), 0) : 0)) +( (h)->temp.tempint = (length), \ + (((h)->next_free + (h)->temp.tempint > (h)->chunk_limit) \ + ? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0)) # define obstack_grow(h,where,length) \ -( (h)->temp = (length), \ - (((h)->next_free + (h)->temp > (h)->chunk_limit) \ - ? (_obstack_newchunk ((h), (h)->temp), 0) : 0), \ - memcpy ((h)->next_free, where, (h)->temp), \ - (h)->next_free += (h)->temp) +( (h)->temp.tempint = (length), \ + (((h)->next_free + (h)->temp.tempint > (h)->chunk_limit) \ + ? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0), \ + memcpy ((h)->next_free, where, (h)->temp.tempint), \ + (h)->next_free += (h)->temp.tempint) # define obstack_grow0(h,where,length) \ -( (h)->temp = (length), \ - (((h)->next_free + (h)->temp + 1 > (h)->chunk_limit) \ - ? (_obstack_newchunk ((h), (h)->temp + 1), 0) : 0), \ - memcpy ((h)->next_free, where, (h)->temp), \ - (h)->next_free += (h)->temp, \ +( (h)->temp.tempint = (length), \ + (((h)->next_free + (h)->temp.tempint + 1 > (h)->chunk_limit) \ + ? (_obstack_newchunk ((h), (h)->temp.tempint + 1), 0) : 0), \ + memcpy ((h)->next_free, where, (h)->temp.tempint), \ + (h)->next_free += (h)->temp.tempint, \ *((h)->next_free)++ = 0) # define obstack_1grow(h,datum) \ @@ -488,10 +461,10 @@ __extension__ \ (((int *) ((h)->next_free += sizeof (int)))[-1] = (aptr)) # define obstack_blank(h,length) \ -( (h)->temp = (length), \ - (((h)->chunk_limit - (h)->next_free < (h)->temp) \ - ? (_obstack_newchunk ((h), (h)->temp), 0) : 0), \ - obstack_blank_fast (h, (h)->temp)) +( (h)->temp.tempint = (length), \ + (((h)->chunk_limit - (h)->next_free < (h)->temp.tempint) \ + ? (_obstack_newchunk ((h), (h)->temp.tempint), 0) : 0), \ + obstack_blank_fast (h, (h)->temp.tempint)) # define obstack_alloc(h,length) \ (obstack_blank ((h), (length)), obstack_finish ((h))) @@ -506,22 +479,23 @@ __extension__ \ ( ((h)->next_free == (h)->object_base \ ? (((h)->maybe_empty_object = 1), 0) \ : 0), \ - (h)->temp = __PTR_TO_INT ((h)->object_base), \ + (h)->temp.tempptr = (h)->object_base, \ (h)->next_free \ - = __INT_TO_PTR ((__PTR_TO_INT ((h)->next_free)+(h)->alignment_mask) \ - & ~ ((h)->alignment_mask)), \ + = __PTR_ALIGN ((h)->object_base, (h)->next_free, \ + (h)->alignment_mask), \ (((h)->next_free - (char *) (h)->chunk \ > (h)->chunk_limit - (char *) (h)->chunk) \ ? ((h)->next_free = (h)->chunk_limit) : 0), \ (h)->object_base = (h)->next_free, \ - (void *) __INT_TO_PTR ((h)->temp)) + (h)->temp.tempptr) # define obstack_free(h,obj) \ -( (h)->temp = (char *) (obj) - (char *) (h)->chunk, \ - (((h)->temp > 0 && (h)->temp < (h)->chunk_limit - (char *) (h)->chunk)\ +( (h)->temp.tempint = (char *) (obj) - (char *) (h)->chunk, \ + ((((h)->temp.tempint > 0 \ + && (h)->temp.tempint < (h)->chunk_limit - (char *) (h)->chunk)) \ ? (int) ((h)->next_free = (h)->object_base \ - = (h)->temp + (char *) (h)->chunk) \ - : (((obstack_free) ((h), (h)->temp + (char *) (h)->chunk), 0), 0))) + = (h)->temp.tempint + (char *) (h)->chunk) \ + : (((obstack_free) ((h), (h)->temp.tempint + (char *) (h)->chunk), 0), 0))) #endif /* not __GNUC__ or not __STDC__ */ -- cgit v1.2.3-54-g00ecf