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      1 /*
      2  * Copyright (c) 2003, 2005, Oracle and/or its affiliates. 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.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * 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 }
     68