1 /*

     2  * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 #include "util.h"

    27 #include "FrameID.h"

    28 #include "threadControl.h"

    29 

    30 /* FrameID: */

    31 

    32 /* ------------------------------------------------------------ */

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

    34 /* ------------------------------------------------------------ */

    35 

    36 #define FNUM_BWIDTH 16

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

    38 

    39 FrameID

    40 createFrameID(jthread thread, FrameNumber fnum)

    41 {

    42     FrameID frame;

    43     jlong frameGeneration;

    44 

    45     frameGeneration = threadControl_getFrameGeneration(thread);

    46     frame = (frameGeneration<<FNUM_BWIDTH) | (jlong)fnum;

    47     return frame;

    48 }

    49 

    50 FrameNumber

    51 getFrameNumber(FrameID frame)

    52 {

    53     /*LINTED*/

    54     return (FrameNumber)(((jint)frame) & FNUM_BMASK);

    55 }

    56 

    57 jdwpError

    58 validateFrameID(jthread thread, FrameID frame)

    59 {

    60     jlong frameGeneration;

    61 

    62     frameGeneration = threadControl_getFrameGeneration(thread);

    63     if ( frameGeneration != (frame>>FNUM_BWIDTH)  ) {

    64         return JDWP_ERROR(INVALID_FRAMEID);

    65     }

    66     return JDWP_ERROR(NONE);

    67 }