[r120]: interpreter-3.x / trunk / kernel / instructions / UseInstruction.cpp  Maximize  Restore  History

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/*----------------------------------------------------------------------------*/
/* */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved. */
/* Copyright (c) 2005-2006 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: */
/* http://www.oorexx.org/license.html */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the following */
/* conditions are met: */
/* */
/* Redistributions of source code must retain the above copyright */
/* 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 */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS */
/* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED */
/* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY */
/* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator ProcedureInstruction.c */
/* */
/* Primitive Procedure Parse Class */
/* */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "ArrayClass.hpp"
#include "QueueClass.hpp"
#include "RexxActivation.hpp"
#include "UseInstruction.hpp"
#include "ExpressionBaseVariable.hpp"
RexxInstructionUse::RexxInstructionUse(
size_t variableCount, /* count of variables */
RexxQueue *variable_list) /* variables */
/******************************************************************************/
/* Function: Complete set up of a USE instruction object */
/******************************************************************************/
{
/* save the variable count */
use_variable_count = (USHORT)variableCount;
while (variableCount > 0) /* loop through the variable list */
/* copying each variable */
OrefSet(this, this->variables[--variableCount], (RexxVariableBase *)variable_list->pop());
}
void RexxInstructionUse::live()
/******************************************************************************/
/* Function: Normal garbage collection live marking */
/******************************************************************************/
{
size_t i; /* loop counter */
size_t count; /* argument count */
setUpMemoryMark
memory_mark(this->nextInstruction); /* must be first one marked */
for (i = 0, count = use_variable_count; i < count; i++)
memory_mark(this->variables[i]);
cleanUpMemoryMark
}
void RexxInstructionUse::liveGeneral()
/******************************************************************************/
/* Function: Generalized object marking */
/******************************************************************************/
{
size_t i; /* loop counter */
size_t count; /* argument count */
setUpMemoryMarkGeneral
/* must be first one marked */
memory_mark_general(this->nextInstruction);
for (i = 0, count = use_variable_count; i < count; i++)
memory_mark_general(this->variables[i]);
cleanUpMemoryMarkGeneral
}
void RexxInstructionUse::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function: Flatten an object */
/******************************************************************************/
{
size_t i; /* loop counter */
size_t count; /* argument count */
setUpFlatten(RexxInstructionUse)
flatten_reference(newThis->nextInstruction, envelope);
for (i = 0, count = use_variable_count; i < count; i++)
flatten_reference(newThis->variables[i], envelope);
cleanUpFlatten
}
void RexxInstructionUse::execute(
RexxActivation *context, /* current activation context */
RexxExpressionStack *stack) /* evaluation stack */
/******************************************************************************/
/* Function: Execute a REXX USE instruction */
/******************************************************************************/
{
size_t size; /* size of guard variables list */
size_t i; /* loop counter */
RexxObject **arglist; /* current argument list */
size_t argcount; /* count of arguments */
RexxVariableBase *variable; /* current variable */
RexxObject *argument; /* processed argument */
context->traceInstruction(this); /* trace if necessary */
/* get the current argument list */
arglist = context->getMethodArgumentList();
argcount = context->getMethodArgumentCount();
size = use_variable_count; /* get the variable list size */
for (i = 0; i < size; i++) { /* process each variable in the list */
variable = this->variables[i]; /* get the current retriever */
if (variable != OREF_NULL) { /* if we have a real entry */
if (i + 1 > argcount) /* no argument here? */
argument = OREF_NULL; /* set a null */
else
argument = arglist[i]; /* get an argument */
if (argument == OREF_NULL) /* no argument? */
/* drop the variable */
variable->drop(context);
else {
context->traceResult(argument);/* trace if necessary */
/* assign the value */
variable->assign(context, argument);
}
}
}
context->pauseInstruction(); /* do debug pause if necessary */
}