EndInstruction.cpp

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/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive End Parse Class                                                  */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "StringClass.hpp"
#include "RexxActivation.hpp"
#include "EndInstruction.hpp"
#include "DoInstruction.hpp"
#include "DoBlock.hpp"
 
RexxInstructionEnd::RexxInstructionEnd(
    RexxString *_name)                  /* The END instruction name          */
/****************************************************************************/
/* Function:  Set the name of an END instruction                            */
/****************************************************************************/
{
  OrefSet(this, this->name, _name);
}
 
void RexxInstructionEnd::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
  memory_mark(this->nextInstruction);  /* must be first one marked          */
  memory_mark(this->name);
}
 
void RexxInstructionEnd::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
                                       /* must be first one marked          */
  memory_mark_general(this->nextInstruction);
  memory_mark_general(this->name);
}
 
void RexxInstructionEnd::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
  setUpFlatten(RexxInstructionEnd)
 
  flatten_reference(newThis->nextInstruction, envelope);
  flatten_reference(newThis->name, envelope);
 
  cleanUpFlatten
}
 
void RexxInstructionEnd::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX END instruction                                */
/****************************************************************************/
{
    RexxDoBlock       *doBlock;          /* target DO block                   */
 
    if (!context->hasActiveBlocks())     /* no possible blocks?               */
    {
        context->traceInstruction(this);     /* trace if necessary                */
                                         /* this is an error                  */
        reportException(Error_Unexpected_end_nodo);
    }
 
    switch (this->getStyle())
    {          /* process each loop type            */
 
        case LOOP_BLOCK:                   /* is this a loop?                   */
            doBlock = context->topBlock();   /* get the top DO block              */
                                             /* reset the indentation             */
            context->setIndent(doBlock->getIndent());
            context->traceInstruction(this);     /* trace if necessary                */
            /* pass on the reexecution           */
            ((RexxInstructionDo *)(doBlock->getParent()))->reExecute(context, stack, doBlock);
            break;
 
        case SELECT_BLOCK:                 /* END of a select block             */
            context->unindent();                 /* remove indentation                */
            context->traceInstruction(this);     /* trace if necessary                */
            /* looking for a WHEN match          */
            /* this is an error                  */
            reportException(Error_When_expected_nootherwise);
            break;
 
            // for labeled BLOCK types, we need to remove the active marker.
        case OTHERWISE_BLOCK:
        case LABELED_OTHERWISE_BLOCK:
        case LABELED_DO_BLOCK:
            context->terminateBlock();
            context->traceInstruction(this);     /* trace if necessary                */
            break;
 
        default:                                 /* all others                        */
            context->unindent();                 /* remove indentation                */
            context->removeBlock();              /* just step back next level         */
            context->traceInstruction(this);     /* trace if necessary                */
            break;
    }
}