ExpressionStack.hpp

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/******************************************************************************/
/* REXX Kernel                                           ExpressionStack.hpp  */
/*                                                                            */
/* Primitive Expression Stack Class Definitions                               */
/*                                                                            */
/******************************************************************************/
 
#ifndef Included_RexxExpressionStack
#define Included_RexxExpressionStack
 
#include "ArrayClass.hpp"
 
class ProtectedObject;
class RexxActivity;
 
class RexxExpressionStack {
 public:
 
  inline void *operator new(size_t size, void *ptr) { return ptr;};
  RexxExpressionStack(RexxObject **frames, size_t items) { stack = frames; size = items; top = stack; }
  RexxExpressionStack() { stack = OREF_NULL; size = 0; top = stack; }
  void live(size_t);
  void liveGeneral(int reason);
  void flatten(RexxEnvelope *);
  void         expandArgs(size_t, size_t, size_t, const char *);
  RexxString * requiredStringArg(size_t);
  RexxString * optionalStringArg(size_t);
  RexxInteger *requiredIntegerArg(size_t, size_t, const char *);
  RexxInteger *optionalIntegerArg(size_t, size_t, const char *);
  RexxObject *requiredBigIntegerArg(size_t, size_t, const char *);
  RexxObject *optionalBigIntegerArg(size_t, size_t, const char *);
  void         migrate(RexxActivity *);
 
  inline void setFrame(RexxObject **frames, size_t items) { stack = frames; size = items; top = stack; *top = OREF_NULL; }
 
  inline void send(RexxString *message, RexxObject *scope, size_t count, ProtectedObject &result) {
                 (*(this->top - count))->messageSend(message, (RexxObject **)(this->top - count + 1), count, scope, result); };
  inline void send(RexxString *message, size_t count, ProtectedObject &result) {
                 (*(this->top - count))->messageSend(message, (RexxObject **)(this->top -count + 1), count, result); };
  inline void         push(RexxObject *value) { *(++this->top) = value; };
  inline RexxObject * pop() { return *(this->top--); };
  inline RexxObject * fastPop() { return *(this->top--); };
  inline RexxArray  * argumentArray(size_t count) { return (new (count, (RexxObject **)(this->top - (count - 1))) RexxArray); };
  inline RexxObject **arguments(size_t count) { return (RexxObject **)(this->top - (count - 1)); };
  inline void         replace(size_t offset, RexxObject *value) { *(this->top - offset) = value; };
  inline size_t       getSize() {return this->size;};
  inline RexxObject * getTop()  {return *(this->top);};
  inline void         operatorResult(RexxObject *value) { *(--this->top) = value; };
  inline void         prefixResult(RexxObject *value)   { *(this->top) = value; };
  inline void         popn(size_t c) {this->top -= c;};
  inline void         clear() {this->top = this->stack;};
  inline RexxObject * peek(size_t v) {return *(this->top - v);};
  inline RexxObject **pointer(size_t v) {return (this->top - v); };
  inline size_t       location() {return this->top - this->stack;};
  inline void         setTop(size_t v) {this->top = this->stack + v;};
  inline void         toss() { this->top--; };
  inline RexxObject **getFrame() { return stack; }
 
protected:
 
  size_t size;                         /* size of the expstack              */
  RexxObject **top;                    /* current expstack top location     */
  RexxObject **stack;                  /* actual stack values               */
};
#endif