ThenInstruction.cpp

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/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive Then Parse Class                                                 */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "RexxActivation.hpp"
#include "ThenInstruction.hpp"
#include "ElseInstruction.hpp"
#include "IfInstruction.hpp"
#include "Token.hpp"
 
RexxInstructionThen::RexxInstructionThen(
    RexxToken         *token,          /* THEN keyword token                */
    RexxInstructionIf *_parent)        /* target parent IF or WHEN clause   */
/******************************************************************************/
/* Function:  Initialize a THEN object                                        */
/******************************************************************************/
{
    SourceLocation location;             /* clause token location             */
 
    OrefSet(this, this->parent, _parent); /* remember the parent IF instruction*/
    /* parent an IF instruction?         */
    if (this->parent->instructionType == KEYWORD_IF)
    {
        /* this is an IF ... THEN clause     */
        this->instructionType = KEYWORD_IFTHEN;
    }
    else                                 /* actually a WHEN                   */
    {
        this->instructionType = KEYWORD_WHENTHEN;
    }
    location = token->getLocation();     /* get the token location info       */
    this->setLocation(location);         /* set the clause location also      */
}
 
void  RexxInstructionThen::setEndInstruction(
    RexxInstructionEndIf *end_clause)  /* end of the IF/WHEN construct      */
/******************************************************************************/
/* Function:  Set the end target of an IF/WHEN construct                      */
/******************************************************************************/
{
                                       /* hook up with the parent object    */
  ((RexxInstructionIf *)this->parent)->setEndInstruction(end_clause);
}
 
void  RexxInstructionThen::setElse(
    RexxInstruction *else_clause)      /* else for an IF construct          */
/******************************************************************************/
/* Function:  Set an ELSE instruction location                                */
/******************************************************************************/
{
                                       /* hook up with the parent object    */
  ((RexxInstructionIf *)this->parent)->setEndInstruction((RexxInstructionEndIf *)else_clause);
                                       /* hook the else to the IF           */
  ((RexxInstructionElse *)else_clause)->setParent((RexxInstructionEndIf *)this->parent);
}
 
void RexxInstructionThen::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
  memory_mark(this->nextInstruction);  /* must be first one marked          */
  memory_mark(this->parent);
}
 
void RexxInstructionThen::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
                                       /* must be first one marked          */
  memory_mark_general(this->nextInstruction);
  memory_mark_general(this->parent);
}
 
void RexxInstructionThen::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
  setUpFlatten(RexxInstructionThen)
 
  flatten_reference(newThis->nextInstruction, envelope);
  flatten_reference(newThis->parent, envelope);
 
  cleanUpFlatten
}
 
void RexxInstructionThen::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX THEN instruction                               */
/****************************************************************************/
{
  context->indent();                   /* indent a bit                      */
  context->traceInstruction(this);     /* trace if necessary                */
  context->indent();                   /* indent a for the next one too     */
  return;                              /* just fall through to following    */
}