/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* https://www.oorexx.org/license.html                                        */
/*                                                                            */
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/* without modification, are permitted provided that the following            */
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/* notice, this list of conditions and the following disclaimer.              */
/* Redistributions in binary form must reproduce the above copyright          */
/* notice, this list of conditions and the following disclaimer in            */
/* the documentation and/or other materials provided with the distribution.   */
/*                                                                            */
/* Neither the name of Rexx Language Association nor the names                */
/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
/*                                                                            */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS        */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT          */
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/*                                                                            */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive Procedure Parse Class                                            */
/*                                                                            */
/******************************************************************************/
#include "RexxCore.h"
#include "QueueClass.hpp"
#include "RexxActivation.hpp"
#include "ProcedureInstruction.hpp"
#include "ExpressionBaseVariable.hpp"


/**
 * Initialize a PROCEDURE instruction.
 *
 * @param varCount The count of variables to expose.
 * @param variable_list
 *                 The queue holding the variables (held in reverse order
 *                 of appearance on the instruction).
 */
RexxInstructionProcedure::RexxInstructionProcedure(size_t varCount, QueueClass *variable_list)
{
    variableCount = varCount;
    // get all of the variable retrievers, in reverse order.
    initializeObjectArray(varCount, variables, RexxVariableBase, variable_list);
}


/**
 * Perform garbage collection on a live object.
 *
 * @param liveMark The current live mark.
 */
void RexxInstructionProcedure::live(size_t liveMark)
{
    // must be first object marked
    memory_mark(nextInstruction);
    memory_mark_array(variableCount, variables);
}


/**
 * Perform generalized live marking on an object.  This is
 * used when mark-and-sweep processing is needed for purposes
 * other than garbage collection.
 *
 * @param reason The reason for the marking call.
 */
void RexxInstructionProcedure::liveGeneral(MarkReason reason)
{
    // must be first object marked
    memory_mark_general(nextInstruction);
    memory_mark_general_array(variableCount, variables);
}


/**
 * Flatten a source object.
 *
 * @param envelope The envelope that will hold the flattened object.
 */
void RexxInstructionProcedure::flatten(Envelope *envelope)
{
    setUpFlatten(RexxInstructionProcedure)

    flattenRef(nextInstruction);
    flattenArrayRefs(variableCount, variables);

    cleanUpFlatten
}

/**
 * Execute a PROCEDURE instruction.
 *
 * @param context The current execution context.
 * @param stack   The current evaluation stack.
 */
void RexxInstructionProcedure::execute(RexxActivation *context, ExpressionStack *stack)
{
    context->traceInstruction(this);

    // the context does the heavy lifting here.
    context->procedureExpose(variables, variableCount);

    context->pauseInstruction();
}