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yap-6.3/H/alloc.h
2001-05-03 17:13:18 +00:00

136 lines
2.8 KiB
C

/*************************************************************************
* *
* YAP Prolog %W% %G% *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: alloc.h *
* Last rev: *
* mods: *
* comments: allocating space *
* *
*************************************************************************/
/* Space Organization:
The data areas is divided in the following way:
Lower Addresses
HeapBase \
| Atom and code space
HeapTop-1 /
HeapTop \
| Free Space
AuxSp \
| Auxiliary stack
AuxTop /
GlobalBase-1/
GlobalBase \
| Global Stack
H /
ASP \
| Local stack
LocalBase /
TRBase /
TR \
| Trail
Higher Adresses
*/
/* definitions required by saver/restorer and memory manager */
typedef CELL YAP_SEG_SIZE;
typedef struct FREEB {
YAP_SEG_SIZE b_size;
struct FREEB *b_next;
struct FREEB *b_next_size;
} BlockHeader;
#define MinBlockSize (sizeof(BlockHeader)+sizeof(YAP_SEG_SIZE))
#define MaxBlockSize 0xffffff
#define InUseFlag 0x1000000
/* the following defines are machine dependant and are used to enforce
the correct alignment for allocated blocks */
#if SIZEOF_INT_P==4
#define YAP_ALIGN 3
#define YAP_ALIGNMASK 0xfffffffc
#else
#define YAP_ALIGN 7
#define YAP_ALIGNMASK 0xfffffff8L
#endif /* ALIGN_LONGS */
#define AdjustSize(X) ((X+YAP_ALIGN) & YAP_ALIGNMASK)
#define ALIGN_YAPTYPE(X,TYPE) (((CELL)(X)+(sizeof(TYPE)-1)) & ~(sizeof(TYPE)-1))
/* I'll assume page size is always a power of two */
#define AdjustPageSize(X) ((X) & (page_size-1) ? \
((X) + page_size) & (~(page_size-1)) : \
(X) )
#define BlockTrailer(b) ((YAP_SEG_SIZE *)b)[((BlockHeader *) b)->b_size]
#define FreeBlocks heap_regs->free_blocks
/* Operating system and architecture dependent page size */
extern int page_size;
void STD_PROTO(YAP_InitHeap, (void *));
#if USE_MMAP
#include <sys/types.h>
#include <sys/mman.h>
#elif USE_SHM
#elif USE_SBRK
#ifdef __svr4__
#include <unistd.h>
#elif sun
#include <sys/types.h>
#include <malloc.h>
void *sbrk(caddr_t);
typedef unsigned size_t;
MALLOC_T malloc(size_t);
void free(MALLOC_T);
MALLOC_T realloc(MALLOC_T,size_t);
MALLOC_T calloc(size_t,size_t);
#endif
#else
#endif
#if defined(YAPOR) || defined(THREADS)
#define HEAPTOP_OWNER(worker_id) ((worker_id) == HeapTopOwner)
#define HEAPTOP_OWN(worker_id) (HeapTopOwner = (worker_id))
#define HEAPTOP_DISOWN(worker_id) (HeapTopOwner = -1)
#else
#define HEAPTOP_OWNER(worker_id) (FALSE)
#define HEAPTOP_OWN(worker_id)
#define HEAPTOP_DISOWN(worker_id)
#endif