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