ElseInstruction.cpp

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/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive Else Parse Class                                                 */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "RexxActivation.hpp"
#include "ElseInstruction.hpp"
#include "IfInstruction.hpp"
#include "Token.hpp"
 
RexxInstructionElse::RexxInstructionElse(
    RexxToken  *token)                 /* actual ELSE token                 */
/******************************************************************************/
/* Function:  Complete ELSE instruction initialization                        */
/******************************************************************************/
{
  SourceLocation location;             /* clause token location             */
 
  location = token->getLocation();     /* get the token location info       */
  this->setLocation(location);         /* set the clause location also      */
}
 
void  RexxInstructionElse::setParent(
    RexxInstructionEndIf *ifthen)      /* link back to associated then      */
/******************************************************************************/
/* Function:  Hook an ELSE instruction back to its parent IF                  */
/******************************************************************************/
{
                                       /* link up with the THEN             */
  OrefSet(this, this->parent, (RexxInstructionIf *)ifthen);
}
 
void  RexxInstructionElse::setEndInstruction(
    RexxInstructionEndIf *end_clause)
/******************************************************************************/
/* Function:  complete links between the IF, THEN, and ELSE constructs now    */
/*            that the full scoping has been resolved.                        */
/******************************************************************************/
{
                                       /* tell the THEN where to finish up  */
  this->parent->setEndInstruction(end_clause);
}
 
void RexxInstructionElse::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
  memory_mark(this->nextInstruction);  /* must be first one marked          */
  memory_mark(this->parent);
}
 
void RexxInstructionElse::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
                                       /* must be first one marked          */
  memory_mark_general(this->nextInstruction);
  memory_mark_general(this->parent);
}
 
void RexxInstructionElse::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
  setUpFlatten(RexxInstructionElse)
 
  flatten_reference(newThis->nextInstruction, envelope);
  flatten_reference(newThis->parent, envelope);
 
  cleanUpFlatten
}
 
void RexxInstructionElse::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX ELSE instruction                               */
/****************************************************************************/
{
  context->indent();                   /* indent a bit                      */
  context->traceInstruction(this);     /* trace if necessary                */
  context->indent();                   /* indent for the next one too       */
  return;                              /* just fall through to following    */
}