EndIf.cpp

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/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive End-If Parse Class                                               */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "RexxActivation.hpp"
#include "IfInstruction.hpp"
#include "Token.hpp"
 
 
RexxInstructionEndIf::RexxInstructionEndIf(
    RexxInstructionIf *_parent)         /* base parent instruction (IF/WHEN) */
/******************************************************************************/
/* Function:  Complete initialization of a PARSE ENDIF object                 */
/******************************************************************************/
{
    this->setType(KEYWORD_ENDTHEN);      /* set the default type              */
    OrefSet(this, this->parent, _parent);/* remember parent IF/WHEN/ELSE      */
    parent->setEndInstruction(this);     /* hook up with the parent object    */
                                         /* is this the ELSE end?             */
    if (parent->instructionType == KEYWORD_ELSE)
    {
 
        this->setType(KEYWORD_ENDELSE);    /* change this into an ELSE end      */
    }
                                           /* is this the ELSE end?             */
    else if (parent->instructionType == KEYWORD_WHENTHEN)
    {
        this->setType(KEYWORD_ENDWHEN);    /* change this into an WHEN end      */
    }
}
 
void RexxInstructionEndIf::setEndInstruction(
    RexxInstructionEndIf *end_clause)  /* target end point                  */
/******************************************************************************/
/* Function:  Set the END skip point for the instruction                      */
/******************************************************************************/
{
                                       /* set the new location              */
  OrefSet(this, this->else_end, end_clause);
}
 
void RexxInstructionEndIf::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
  memory_mark(this->nextInstruction);  /* must be first one marked          */
  memory_mark(this->else_end);
  memory_mark(this->parent);
}
 
void RexxInstructionEndIf::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
                                       /* must be first one marked          */
  memory_mark_general(this->nextInstruction);
  memory_mark_general(this->else_end);
  memory_mark_general(this->parent);
}
 
 
void RexxInstructionEndIf::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
  setUpFlatten(RexxInstructionEndIf)
 
  flatten_reference(newThis->nextInstruction, envelope);
  flatten_reference(newThis->else_end, envelope);
  flatten_reference(newThis->parent, envelope);
 
  cleanUpFlatten
}
 
void RexxInstructionEndIf::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack)        /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX ENDIF instruction                              */
/****************************************************************************/
{
                                         /* this the end of a WHEN block?     */
    if (this->instructionType == KEYWORD_ENDWHEN)
    {
        // remove the select block and reset the indent
        context->terminateBlock();
                                           /* set the restart point             */
        context->setNext((this->else_end)->nextInstruction);
    }
    else
    {
        context->unindent();                 /* unindent the context              */
        context->unindent();                 /* unindent for the total            */
        if (this->else_end != OREF_NULL)     /* have to jump around an else?      */
        {
                                             /* set the restart point             */
            context->setNext((this->else_end)->nextInstruction);
        }
    }
}