/* prmc.h: MUTATOR CONTEXT INTERFACE
 *
 * $Id: //info.ravenbrook.com/project/mps/master/code/prmc.h#7 $
 * 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 */


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