DropInstruction.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 Drop Parse Class                                                 */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "QueueClass.hpp"
#include "RexxActivation.hpp"
#include "DropInstruction.hpp"
#include "ExpressionBaseVariable.hpp"
#include "StackClass.hpp"
#include "RexxActivity.hpp"
#include "BufferClass.hpp"
 
RexxInstructionDrop::RexxInstructionDrop(
    size_t     varCount,               /* number of variables to process    */
    RexxQueue *variable_list)          /* list of variables to drop         */
/******************************************************************************/
/* Complete initialization of a DROP instruction                              */
/******************************************************************************/
{
    /* get the variable size             */
    variableCount = varCount;            /* save the variable count           */
    while (varCount > 0)                 /* loop through the variable list    */
    {
        /* copying each variable             */
        OrefSet(this, this->variables[--varCount], (RexxVariableBase *)variable_list->pop());
    }
}
 
void RexxInstructionDrop::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
    size_t i;                            /* loop counter                      */
    size_t count;                        /* argument count                    */
 
    memory_mark(this->nextInstruction);  /* must be first one marked          */
    for (i = 0, count = variableCount; i < count; i++)
    {
        memory_mark(this->variables[i]);
    }
}
 
void RexxInstructionDrop::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
    size_t i;                            /* loop counter                      */
    size_t count;                        /* argument count                    */
 
                                         /* must be first one marked          */
    memory_mark_general(this->nextInstruction);
    for (i = 0, count = variableCount; i < count; i++)
    {
        memory_mark_general(this->variables[i]);
    }
}
 
void RexxInstructionDrop::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
    size_t i;                            /* loop counter                      */
    size_t count;                        /* argument count                    */
 
    setUpFlatten(RexxInstructionDrop)
 
    flatten_reference(newThis->nextInstruction, envelope);
    for (i = 0, count = variableCount; i < count; i++)
    {
        flatten_reference(newThis->variables[i], envelope);
    }
 
    cleanUpFlatten
}
 
void RexxInstructionDrop::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack)        /* evaluation stack                  */
/******************************************************************************/
/* Function:  Execute a REXX DROP instruction                                 */
/**********************************************************************************/
{
    size_t      size;                    /* size of guard variables list      */
    size_t      i;                       /* loop counter                      */
 
    context->traceInstruction(this);     /* trace if necessary                */
                                         /* get the array size                */
    size = variableCount;                /* get the variable list size        */
 
    for (i = 0; i < size; i++)         /* loop through the variable list    */
    {
        /* have the variable drop itself */
        variables[i]->drop(context);
    }
    context->pauseInstruction();         /* do debug pause if necessary       */
}