ActivationFrame.hpp

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#ifndef ActivationFrame_Included
#define ActivationFrame_Included
 
#include "RexxActivity.hpp"
 
class RexxActivation;
class RexxNativeActivation;
class RexxMethod;
class StackFrameClass;
class RexxSource;
 
class ActivationFrame
{
friend class RexxActivity;
public:
    inline ActivationFrame(RexxActivity *a) : activity(a)
    {
        // it would be better to have the activity class do this, but because
        // we're doing this with inline methods, we run into a bit of a
        // circular reference problem
        next = activity->activationFrames;
        activity->activationFrames = this;
    }
 
    inline ~ActivationFrame()
    {
        // remove ourselves from the list and give this object a
        // little hold protection.
        activity->activationFrames = next;
    }
 
    virtual RexxString *messageName() = 0;
    virtual RexxMethod *method() = 0;
    virtual StackFrameClass *createStackFrame() = 0;
    virtual RexxSource *getSource() = 0;
 
protected:
    ActivationFrame *next;             // the next activation frame in the chain
    RexxActivity *activity;            // the activity we're running on
};
 
 
class RexxActivationFrame : public ActivationFrame
{
public:
    inline RexxActivationFrame(RexxActivity *a, RexxActivation *context) : ActivationFrame(a), activation(context) { }
 
    virtual RexxString *messageName();
    virtual RexxMethod *method();
    virtual StackFrameClass *createStackFrame();
    virtual RexxSource *getSource();
 
protected:
    RexxActivation *activation;        // the activation backing this frame
};
 
 
class NativeActivationFrame : public ActivationFrame
{
public:
    inline NativeActivationFrame(RexxActivity *a, RexxNativeActivation *context) : ActivationFrame(a), activation(context) { }
 
    virtual RexxString *messageName();
    virtual RexxMethod *method();
    virtual StackFrameClass *createStackFrame();
    virtual RexxSource *getSource();
 
protected:
    RexxNativeActivation *activation;        // the activation backing this frame
};
 
 
class InternalActivationFrame : public ActivationFrame
{
public:
    inline InternalActivationFrame(RexxActivity *a, RexxString *n, RexxObject *t, RexxMethod *m, RexxObject **args, size_t c, size_t nc)
        : ActivationFrame(a), name(n), target(t), frameMethod(m), argPtr(args), count(c), named_count(nc) { }
 
    virtual RexxString *messageName();
    virtual RexxMethod *method();
    virtual StackFrameClass *createStackFrame();
    virtual RexxSource *getSource();
 
protected:
    RexxString *name;                        // message name associated with the invocation
    RexxMethod *frameMethod;                 // the backing method object
    RexxObject *target;                      // method target
    RexxObject **argPtr;                     // arguments passed to this instance
    size_t       count;                      // count of positional arguments
    size_t       named_count;                // count of named arguments
};
 
 
class ParseActivationFrame : public ActivationFrame
{
public:
    inline ParseActivationFrame(RexxActivity *a, RexxSource *s) : ActivationFrame(a), source(s) { }
 
    virtual RexxString *messageName();
    virtual RexxMethod *method();
    virtual StackFrameClass *createStackFrame();
    virtual RexxSource *getSource();
 
protected:
    RexxSource *source;                      // the source object being parsed.
};
 
#endif