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/* pooln.c: NULL POOL CLASS
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*/
#include "pooln.h"
#include "mpm.h"
SRCID(pooln, "$Id$");
/* PoolNStruct -- the pool structure */
typedef struct PoolNStruct {
PoolStruct poolStruct; /* generic pool structure */
/* and that's it */
} PoolNStruct;
typedef PoolN NPool;
DECLARE_CLASS(Pool, NPool, AbstractPool);
/* PoolPoolN -- get the PoolN structure from generic Pool */
#define PoolPoolN(pool) PARENT(PoolNStruct, poolStruct, pool)
/* PoolPoolN -- get the generic pool structure from a PoolN */
#define PoolNPool(pooln) (&(poolN)->poolStruct)
/* NInit -- init method for class N */
static Res NInit(Pool pool, Arena arena, PoolClass klass, ArgList args)
{
PoolN poolN;
Res res;
AVER(pool != NULL);
AVERT(Arena, arena);
AVERT(ArgList, args);
UNUSED(klass); /* used for debug pools only */
res = NextMethod(Pool, NPool, init)(pool, arena, klass, args);
if (res != ResOK)
goto failNextInit;
poolN = CouldBeA(NPool, pool);
/* Initialize pool-specific structures. */
SetClassOfPoly(pool, CLASS(NPool));
AVERC(PoolN, poolN);
return ResOK;
failNextInit:
AVER(res != ResOK);
return res;
}
/* NFinish -- finish method for class N */
static void NFinish(Inst inst)
{
Pool pool = MustBeA(AbstractPool, inst);
PoolN poolN = MustBeA(NPool, pool);
/* Finish pool-specific structures. */
UNUSED(poolN);
NextMethod(Inst, NPool, finish)(inst);
}
/* NAlloc -- alloc method for class N */
static Res NAlloc(Addr *pReturn, Pool pool, Size size)
{
PoolN poolN = MustBeA(NPool, pool);
AVER(pReturn != NULL);
AVER(size > 0);
UNUSED(poolN);
return ResLIMIT; /* limit of nil blocks exceeded */
}
/* NFree -- free method for class N */
static void NFree(Pool pool, Addr old, Size size)
{
PoolN poolN = MustBeA(NPool, pool);
AVER(old != (Addr)0);
AVER(size > 0);
UNUSED(poolN);
NOTREACHED; /* can't allocate, should never free */
}
/* NBufferFill -- buffer fill method for class N */
static Res NBufferFill(Addr *baseReturn, Addr *limitReturn,
Pool pool, Buffer buffer, Size size)
{
PoolN poolN = MustBeA(NPool, pool);
AVER(baseReturn != NULL);
AVER(limitReturn != NULL);
AVERT(Buffer, buffer);
AVER(BufferIsReset(buffer));
AVER(size > 0);
UNUSED(poolN);
NOTREACHED; /* can't create buffers, so shouldn't fill them */
return ResUNIMPL;
}
/* NBufferEmpty -- buffer empty method for class N */
static void NBufferEmpty(Pool pool, Buffer buffer)
{
AVERT(Pool, pool);
AVERT(Buffer, buffer);
AVER(BufferIsReady(buffer));
NOTREACHED; /* can't create buffers, so they shouldn't trip */
}
/* NDescribe -- describe method for class N */
static Res NDescribe(Inst inst, mps_lib_FILE *stream, Count depth)
{
Pool pool = CouldBeA(AbstractPool, inst);
PoolN poolN = CouldBeA(NPool, pool);
Res res;
res = NextMethod(Inst, NPool, describe)(inst, stream, depth);
if (res != ResOK)
return res;
/* This is where you'd output some information about pool fields. */
UNUSED(poolN);
return ResOK;
}
/* NPoolClass -- pool class definition for N */
DEFINE_CLASS(Pool, NPool, klass)
{
INHERIT_CLASS(klass, NPool, AbstractPool);
klass->instClassStruct.describe = NDescribe;
klass->instClassStruct.finish = NFinish;
klass->size = sizeof(PoolNStruct);
klass->attr |= AttrGC;
klass->init = NInit;
klass->alloc = NAlloc;
klass->free = NFree;
klass->bufferFill = NBufferFill;
klass->bufferEmpty = NBufferEmpty;
AVERT(PoolClass, klass);
}
/* PoolClassN -- returns the PoolClass for the null pool class */
PoolClass PoolClassN(void)
{
return CLASS(NPool);
}
/* PoolNCheck -- check a pool of class N */
Bool PoolNCheck(PoolN poolN)
{
CHECKL(poolN != NULL);
CHECKD(Pool, PoolNPool(poolN));
CHECKC(NPool, poolN);
UNUSED(poolN); /* <code/mpm.c#check.unused> */
return TRUE;
}
/* 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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