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/* $Id: vmopen.c,v 1.1.1.1 2004/12/23 04:04:26 ellson Exp $ $Revision: 1.1.1.1 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
#include "vmhdr.h"
/* Opening a new region of allocation.
** Note that because of possible exotic memory types,
** all region data must be stored within the space given
** by the discipline.
**
** Written by Kiem-Phong Vo, kpv@research.att.com, 01/16/94.
*/
typedef struct _vminit_ {
Vmdata_t vd; /* space for the region itself */
Seg_t seg; /* space for segment */
Block_t block; /* space for a block */
Head_t head; /* space for the fake header */
char a[3 * ALIGN]; /* extra to fuss with alignment */
} Vminit_t;
#if __STD_C
Vmalloc_t *vmopen(Vmdisc_t * disc, Vmethod_t * meth, int mode)
#else
Vmalloc_t *vmopen(disc, meth, mode)
Vmdisc_t *disc; /* discipline to get segments */
Vmethod_t *meth; /* method to manage space */
int mode; /* type of region */
#endif
{
reg Vmalloc_t *vm;
reg Vmdata_t *vd;
reg size_t s, a, incr;
reg Block_t *b;
reg Seg_t *seg;
Vmuchar_t *addr;
reg Vmemory_f memoryf;
reg int e;
if (!meth || !disc || !(memoryf = disc->memoryf))
return NIL(Vmalloc_t *);
GETPAGESIZE(_Vmpagesize);
/* note that Vmalloc_t space must be local to process since that's
where the meth&disc function addresses are going to be stored */
if (!(vm = (Vmalloc_t *) vmalloc(Vmheap, sizeof(Vmalloc_t))))
return NIL(Vmalloc_t *);
vm->meth = *meth;
vm->disc = disc;
vm->file = NIL(char *);
vm->line = 0;
if (disc->exceptf) {
addr = NIL(Vmuchar_t *);
if ((e =
(*disc->exceptf) (vm, VM_OPEN, (Void_t *) (&addr),
disc)) != 0) {
if (e < 0 || !addr)
goto open_error;
/* align this address */
if ((a = (size_t) (VLONG(addr) % ALIGN)) != 0)
addr += ALIGN - a;
/* see if it's a valid region */
vd = (Vmdata_t *) addr;
if ((vd->mode & meth->meth) != 0) {
vm->data = vd;
return vm;
} else {
open_error:
vmfree(Vmheap, vm);
return NIL(Vmalloc_t *);
}
}
}
/* make sure vd->incr is properly rounded */
incr = disc->round <= 0 ? _Vmpagesize : disc->round;
incr = MULTIPLE(incr, ALIGN);
/* get space for region data */
s = ROUND(sizeof(Vminit_t), incr);
if (!(addr = (Vmuchar_t *) (*memoryf) (vm, NIL(Void_t *), 0, s, disc))) {
vmfree(Vmheap, vm);
return NIL(Vmalloc_t *);
}
/* make sure that addr is aligned */
if ((a = (size_t) (VLONG(addr) % ALIGN)) != 0)
addr += ALIGN - a;
/* initialize region */
vd = (Vmdata_t *) addr;
vd->mode = (mode & VM_FLAGS) | meth->meth;
vd->incr = incr;
vd->pool = 0;
vd->free = vd->wild = NIL(Block_t *);
if (vd->mode & (VM_TRACE | VM_MTDEBUG))
vd->mode &= ~VM_TRUST;
if (vd->mode & (VM_MTBEST | VM_MTDEBUG | VM_MTPROFILE)) {
vd->root = NIL(Block_t *);
for (e = S_TINY - 1; e >= 0; --e)
TINY(vd)[e] = NIL(Block_t *);
for (e = S_CACHE; e >= 0; --e)
CACHE(vd)[e] = NIL(Block_t *);
incr = sizeof(Vmdata_t);
} else
incr = OFFSET(Vmdata_t, root);
vd->seg = (Seg_t *) (addr + ROUND(incr, ALIGN));
/**/ ASSERT(VLONG(vd->seg) % ALIGN == 0);
seg = vd->seg;
seg->next = NIL(Seg_t *);
seg->vm = vm;
seg->addr = (Void_t *) (addr - (a ? ALIGN - a : 0));
seg->extent = s;
seg->baddr = addr + s - (a ? ALIGN : 0);
seg->size = s; /* this size is larger than usual so that the segment
will not be freed until the region is closed. */
seg->free = NIL(Block_t *);
/* make a data block out of the remainder */
b = SEGBLOCK(seg);
SEG(b) = seg;
SIZE(b) = seg->baddr - (Vmuchar_t *) b - 2 * sizeof(Head_t);
*SELF(b) = b;
/**/ ASSERT(SIZE(b) % ALIGN == 0);
/**/ ASSERT(VLONG(b) % ALIGN == 0);
/* make a fake header for next block in case of noncontiguous segments */
SEG(NEXT(b)) = seg;
SIZE(NEXT(b)) = BUSY | PFREE;
if (vd->mode & (VM_MTLAST | VM_MTPOOL))
seg->free = b;
else
vd->wild = b;
vm->data = vd;
/* put into linked list of regions */
vm->next = Vmheap->next;
Vmheap->next = vm;
return vm;
}
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