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/* prmc.h: MUTATOR CONTEXT INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/prmc.h#1 $
 * Copyright (c) 2016 Ravenbrook Limited.  See end of file for license.
 *
 * See <design/prmc/> for the design of the generic interface including
 * the contracts for these functions.
 *
 * This interface has several different implementations, typically one
 * per platform, see <code/prmc*.c> for the various implementations.
 */

#ifndef prmc_h
#define prmc_h

#include "mpmtypes.h"

#define MutatorContextSig ((Sig)0x519302C0) /* SIGnature MUTator COntext */

enum {
  MutatorContextFAULT, /* Context of thread stopped by protection fault. */
  MutatorContextTHREAD, /* Context of thread stopped by thread manager. */
  MutatorContextLIMIT
};

typedef unsigned MutatorContextVar;

extern Bool MutatorContextCheck(MutatorContext context);
extern Bool MutatorContextCanStepInstruction(MutatorContext context);
extern Res MutatorContextStepInstruction(MutatorContext context);
extern Addr MutatorContextSP(MutatorContext context);
extern Res MutatorContextScan(ScanState ss, MutatorContext context,
                              mps_area_scan_t scan, void *closure);


#endif /* prmc_h */


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2016 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * 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.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * 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, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND 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.
 */