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/* prmc.h: MUTATOR CONTEXT INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/master/code/prmc.h#8 $
 * Copyright (c) 2016-2020 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) 2016-2020 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.
 */