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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
createFrameID(jthread thread,FrameNumber fnum)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
getFrameNumber(FrameID frame)51 getFrameNumber(FrameID frame)
52 {
53     /*LINTED*/
54     return (FrameNumber)(((jint)frame) & FNUM_BMASK);
55 }
56 
57 jdwpError
validateFrameID(jthread thread,FrameID frame)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