ActivationApiContexts.hpp

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/******************************************************************************/
/* REXX Kernel                                                                */
/*                                                                            */
/* Definition of contexts used for API call vector states.                    */
/*                                                                            */
/******************************************************************************/
#ifndef ActivationApiContexts_Included
#define ActivationApiContexts_Included
 
#include "RexxCore.h"
 
class RexxActivity;
class RexxNativeActivation;
class InterpreterInstance;
 
// structure used to hand out a thread context structure for this
// activity.  This stucture contains a RexxThreadContext structure
// followed by a self-referential pointer back to the containing
// activity.  This gives us a quick mapping back to the activity
// associated with the thread context.
 
typedef struct
{
    RexxInstance instanceContext;           // externalized instance context
    InterpreterInstance *instance;          // the instance this represents
} InstanceContext;
 
typedef struct
{
    RexxThreadContext threadContext;        // the thread context structure used for the API
    RexxActivity *owningActivity;           // a pointer back to the owning activity
} ActivityContext;
 
// and similar structures for other API context structures
typedef struct
{
    RexxMethodContext threadContext;        // the thread context structure used for the API
    RexxNativeActivation *context;          // a pointer back to the owning activation
} MethodContext;
 
typedef struct
{
    RexxCallContext   threadContext;        // the thread context structure used for the API
    RexxNativeActivation *context;          // a pointer back to the owning activation
} CallContext;
 
typedef struct
{
    RexxExitContext   threadContext;        // the thread context structure used for the API
    RexxNativeActivation *context;          // a pointer back to the owning activation
} ExitContext;
 
 
/**
 * Convert a context into the activity the context is associated with.
 *
 * @param c      The calling thread context.
 *
 * @return The activity object the context is associated with.
 */
inline RexxActivity *contextToActivity(RexxThreadContext *c)
{
    return ((ActivityContext *)c)->owningActivity;
}
 
 
/**
 * Convert a context into the activity the context is associated with.
 *
 * @param c      The calling thread context.
 *
 * @return The activity object the context is associated with.
 */
inline RexxActivity *contextToActivity(RexxCallContext *c)
{
    return ((ActivityContext *)(c->threadContext))->owningActivity;
}
 
 
/**
 * Convert a context into the activity the context is associated with.
 *
 * @param c      The calling thread context.
 *
 * @return The activity object the context is associated with.
 */
inline RexxActivity *contextToActivity(RexxMethodContext *c)
{
    return ((ActivityContext *)(c->threadContext))->owningActivity;
}
 
 
/**
 * Convert a context into the activity the context is associated with.
 *
 * @param c      The calling thread context.
 *
 * @return The activity object the context is associated with.
 */
inline RexxActivity *contextToActivity(RexxExitContext *c)
{
    return ((ActivityContext *)(c->threadContext))->owningActivity;
}
 
#endif