/* prmcxc.c: MUTATOR CONTEXT (macOS)
*
* $Id: //info.ravenbrook.com/project/mps/master/code/prmcxc.c#8 $
* Copyright (c) 2016-2020 Ravenbrook Limited. See end of file for license.
*
* .purpose: Implement the mutator context module. <design/prmc>.
*
*
* ASSUMPTIONS
*
* .context.regroots: The root registers are assumed to be recorded in
* the context at pointer-aligned boundaries.
*/
#include "prmcxc.h"
SRCID(prmcxc, "$Id: //info.ravenbrook.com/project/mps/master/code/prmcxc.c#8 $");
#if !defined(MPS_OS_XC)
#error "prmcxc.c is specific to MPS_OS_XC"
#endif
Bool MutatorContextCheck(MutatorContext context)
{
CHECKS(MutatorContext, context);
CHECKL(sizeof *context->threadState == sizeof(THREAD_STATE_S));
CHECKL(NONNEGATIVE(context->var));
CHECKL(context->var < MutatorContextLIMIT);
CHECKL((context->var == MutatorContextTHREAD) == (context->address == NULL));
CHECKL(context->threadState != NULL);
return TRUE;
}
void MutatorContextInitFault(MutatorContext context, Addr address,
THREAD_STATE_S *threadState)
{
AVER(context != NULL);
AVER(address != NULL);
AVER(threadState != NULL);
context->var = MutatorContextFAULT;
context->address = address;
context->threadState = threadState;
context->sig = MutatorContextSig;
AVERT(MutatorContext, context);
}
void MutatorContextInitThread(MutatorContext context,
THREAD_STATE_S *threadState)
{
AVER(context != NULL);
AVER(threadState != NULL);
context->var = MutatorContextTHREAD;
context->address = NULL;
context->threadState = threadState;
context->sig = MutatorContextSig;
AVERT(MutatorContext, context);
}
Res MutatorContextScan(ScanState ss, MutatorContext context,
mps_area_scan_t scan_area, void *closure)
{
THREAD_STATE_S *mc;
Res res;
AVERT(ScanState, ss);
AVERT(MutatorContext, context);
AVER(context->var == MutatorContextTHREAD);
/* This scans the root registers (.context.regroots). It also
unnecessarily scans the rest of the context. The optimisation
to scan only relevant parts would be architecture dependent. */
mc = context->threadState;
res = TraceScanArea(ss,
(Word *)mc,
(Word *)((char *)mc + sizeof(*mc)),
scan_area, closure);
return res;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2016-2020 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.
*/