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/*
|| This file is part of Pike. For copyright information see COPYRIGHT.
|| Pike is distributed under GPL, LGPL and MPL. See the file COPYING
|| for more information.
*/
#ifndef MACROS_H
#define MACROS_H
#include "global.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include "pike_memory.h"
#define PTR_TO_INT(PTR) ((size_t) ((char *) (PTR) - (char *) NULL))
#if __GNUC__ >= 4
# define OFFSETOF(T,X) __builtin_offsetof(struct T,X)
# define ALIGNOF(X) __alignof__(X)
#else
# define OFFSETOF(T, X) PTR_TO_INT(& (((struct T *)NULL)->X))
# define ALIGNOF(X) OFFSETOF({ char ignored_; X fooo_;}, fooo_)
#endif
#define BASEOF(ptr, str_type, field) \
((struct str_type *)((char*)ptr - OFFSETOF(str_type, field)))
#define NELEM(a) (sizeof (a) / sizeof ((a)[0]))
#define ALLOC_STRUCT(X) ( (struct X *)xalloc(sizeof(struct X)) )
#define MINIMUM(X,Y) ((X)<(Y)?(X):(Y))
#define MAXIMUM(X,Y) ((X)>(Y)?(X):(Y))
PMOD_EXPORT extern const char Pike_is8bitalnum_vector[];
#define is8bitalnum(X) (Pike_is8bitalnum_vector[((unsigned)(X))&0xff] == '1')
#define isidchar(X) is8bitalnum(X)
#define DO_ALIGN(X,Y) (((size_t)(X)+((Y)-1)) & ~((Y)-1))
#define CONSTANT_STRLEN(X) (sizeof(X) - sizeof(""))
#define SET_NEXT_AND_FREE(p,free_item) do{ \
next=p->next; \
while(p->refs == 1 && (next=p->next)) \
{ \
add_ref(next); \
free_item(p); \
p=next; \
} \
free_item(p); \
}while(0)
/* This variant never leaves p pointing at a deallocated block, as the
* one above can do. I.e. it frees a ref to the item p points at, and
* sets p to the same or next item with references, or sets it to
* zero. */
/* how can SET_NEXT_AND_FREE leave *next* pointing to a deallocated block?
* -Hubbe
*/
/* Afaik it doesn't, but it leaves no value that is usable for the
* purposes this macro was made for. /mast */
#define FREE_AND_GET_REFERENCED(p, item_type, free_item) do { \
item_type *next; \
while (1) { \
if (p->refs > 1) { \
free_item(p); \
break; \
} \
if (!(next = p->next)) { \
free_item(p); \
p = 0; \
break; \
} \
add_ref(next); \
free_item(p); \
p = next; \
} \
} while (0)
#define DOUBLELINK(first_object, o) do { \
debug_malloc_touch(o); \
o->next=first_object; \
o->prev=0; \
if(first_object) first_object->prev=o; \
first_object=o; \
}while(0)
#define DOUBLEUNLINK(first_object,o) do{ \
debug_malloc_touch(o); \
if(o->prev) { \
o->prev->next=o->next; \
}else { \
DO_IF_DEBUG( \
if(first_object != o) { \
describe(o); \
Pike_fatal("Linked in wrong list!\n"); \
} \
) \
first_object=o->next; \
} \
\
if(o->next) o->next->prev=o->prev; \
}while(0)
#define PIKE_XCONCAT(X,Y) PIKE_CONCAT(X,Y)
#define PIKE_XCONCAT3(X,Y,Z) PIKE_CONCAT(X,Y,Z)
#define PIKE_XCONCAT4(X,Y,Z,Q) PIKE_CONCAT(X,Y,Z,Q)
/* Useful to get a literal comma in an argument to a macro. */
#define COMMA ,
/* Necessary to pass an empty argument to a macro for some preprocessors. */
#define NOTHING
#endif
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