Quelle FrameID.c Sprache: C

/*
* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

#include "util.h"
#include "FrameID.h"
#include "threadControl.h"

/* FrameID: */

/* ------------------------------------------------------------ */
/* | thread frame generation (48 bits)| frame number (16 bits)| */
/* ------------------------------------------------------------ */

#define FNUM_BWIDTH 16
#define FNUM_BMASK ((1<<FNUM_BWIDTH)-1)

FrameID
createFrameID(jthread thread, FrameNumber fnum)
{
    FrameID frame;
    jlong frameGeneration;

    frameGeneration = threadControl_getFrameGeneration(thread);
    frame = (frameGeneration<<FNUM_BWIDTH) | (jlong)fnum;
    return frame;
}

FrameNumber
getFrameNumber(FrameID frame)
{
    /*LINTED*/
    return (FrameNumber)(((jint)frame) & FNUM_BMASK);
}

jdwpError
validateFrameID(jthread thread, FrameID frame)
{
    jlong frameGeneration;

    frameGeneration = threadControl_getFrameGeneration(thread);
    if ( frameGeneration != (frame>>FNUM_BWIDTH)  ) {
        return JDWP_ERROR(INVALID_FRAMEID);
    }
    return JDWP_ERROR(NONE);
}

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