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/* boot.c: BOOTSTRAP ALLOCATOR
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* .overview: A structure and protocols for allocating memory from a
* given block. Very simple, it basically just increments a pointer.
*
* .boot.c: The Bootstrap Allocator is used to allocate C structures
* for use in the implementation, not client objects. Therefore,
* we use "C types" (void *, size_t) not "client types" (Addr, Size).
*/
#include "boot.h"
#include "mpm.h"
SRCID(boot, "$Id$");
#define BootBlockSig ((Sig)0x519B002B) /* SIGnature BOOT Block */
/* BootBlockCheck -- check a BootBlock structure */
Bool BootBlockCheck(BootBlock boot)
{
CHECKS(BootBlock, boot);
CHECKL(boot->base != NULL);
CHECKL(boot->alloc != NULL);
CHECKL(boot->limit != NULL);
CHECKL(boot->base <= boot->alloc);
CHECKL(boot->alloc <= boot->limit);
CHECKL(boot->base < boot->limit);
return TRUE;
}
/* BootBlockInit -- initialize a BootBlock
*
* boot: a pointer to the structure to be initialized
* (must have been allocated by the caller, probably on the stack).
* base: a pointer to the base of the memory to be allocated from
* from (the memory need not be committed)
* limit: a pointer to the limit of the memory to be allocated from
*/
Res BootBlockInit(BootBlockStruct *boot, void *base, void *limit)
{
/* Can't check boot as we are supposed to be initializing it */
AVER(boot != NULL);
AVER(base != NULL);
AVER(limit != NULL);
AVER(base < limit);
boot->base = base;
boot->alloc = base;
boot->limit = limit;
boot->sig = BootBlockSig;
AVERT(BootBlock, boot);
return ResOK;
}
/* BootBlockFinish -- finish a BootBlock structure */
void BootBlockFinish(BootBlock boot)
{
AVERT(BootBlock, boot);
boot->base = boot->alloc = boot->limit = NULL;
boot->sig = SigInvalid;
}
/* BootAllocated
*
* Returns the total amount allocated using this descriptor
*/
size_t BootAllocated(BootBlock boot)
{
AVERT(BootBlock, boot);
return PointerOffset(boot->base, boot->alloc);
}
/* BootAlloc -- allocate from BootBlock structure
*
* preturn: The returned pointer, see .boot.c.
* boot: must have been initialized with BootBlockInit().
* size: size of requested object, see .boot.c.
* align: required alignment of object, see .boot.c.
*/
Res BootAlloc(void **pReturn, BootBlock boot, size_t size, size_t align)
{
void *blockBase, *blockLimit; /* base, limit of candidate block */
AVER(pReturn != NULL);
AVERT(BootBlock, boot);
AVER(size > 0);
AVERT(Align, (Align)align);
/* Align alloc pointer up and bounds check. */
blockBase = PointerAlignUp(boot->alloc, align);
if(boot->limit <= blockBase || blockBase < boot->alloc) {
return ResMEMORY;
}
blockLimit = PointerAdd(blockBase, size);
/* Following checks that the ordering constraint holds: */
/* boot->alloc <= blockBase < blockLimit <= boot->limit */
/* (if it doesn't hold then something overallocated/wrapped round) */
if(blockBase < boot->alloc ||
blockLimit <= blockBase ||
boot->limit < blockLimit) {
return ResMEMORY;
}
/* Fits! So allocate it */
boot->alloc = blockLimit;
*pReturn = blockBase;
return ResOK;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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