Mercurial > hg > truffle
annotate agent/src/os/win32/Message.hpp @ 3917:eca1193ca245
4965777: GC changes to support use of discovered field for pending references
Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose.
Reviewed-by: jcoomes, mchung, stefank
author | ysr |
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date | Wed, 07 Sep 2011 13:55:42 -0700 |
parents | c18cbe5936b8 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2001, Oracle and/or its affiliates. All rights reserved. |
0 | 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. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #ifndef _MESSAGE_ | |
26 #define _MESSAGE_ | |
27 | |
28 // These are the commands sent from the server to the child processes | |
29 // over the child processes' stdin pipes. A subset of the commands | |
30 // understood by the overall system, these require responses from the | |
31 // child process. Having a data structure rather than sending text | |
32 // simplifies parsing on the child side. The child replies by sending | |
33 // back fully-formatted replies which are copied by the server process | |
34 // to the clients' sockets. | |
35 | |
36 struct PeekArg { | |
37 DWORD address; | |
38 DWORD numBytes; | |
39 }; | |
40 | |
41 // NOTE: when sending a PokeArg to the child process, we handle the | |
42 // buffer specially | |
43 struct PokeArg { | |
44 DWORD address; | |
45 DWORD numBytes; | |
46 void* data; | |
47 }; | |
48 | |
49 // Used for continueevent | |
50 struct BoolArg { | |
51 bool val; | |
52 }; | |
53 | |
54 // Used for duphandle, closehandle, and getcontext | |
55 struct HandleArg { | |
56 HANDLE handle; | |
57 }; | |
58 | |
59 // Used for setcontext | |
60 const int NUM_REGS_IN_CONTEXT = 22; | |
61 struct SetContextArg { | |
62 HANDLE handle; | |
63 DWORD Eax; | |
64 DWORD Ebx; | |
65 DWORD Ecx; | |
66 DWORD Edx; | |
67 DWORD Esi; | |
68 DWORD Edi; | |
69 DWORD Ebp; | |
70 DWORD Esp; | |
71 DWORD Eip; | |
72 DWORD Ds; | |
73 DWORD Es; | |
74 DWORD Fs; | |
75 DWORD Gs; | |
76 DWORD Cs; | |
77 DWORD Ss; | |
78 DWORD EFlags; | |
79 DWORD Dr0; | |
80 DWORD Dr1; | |
81 DWORD Dr2; | |
82 DWORD Dr3; | |
83 DWORD Dr6; | |
84 DWORD Dr7; | |
85 }; | |
86 | |
87 // Used for selectorentry | |
88 struct SelectorEntryArg { | |
89 HANDLE handle; | |
90 DWORD selector; | |
91 }; | |
92 | |
93 struct Message { | |
94 typedef enum { | |
95 ATTACH, | |
96 DETACH, | |
97 LIBINFO, | |
98 PEEK, | |
99 POKE, | |
100 THREADLIST, | |
101 DUPHANDLE, | |
102 CLOSEHANDLE, | |
103 GETCONTEXT, | |
104 SETCONTEXT, | |
105 SELECTORENTRY, | |
106 SUSPEND, | |
107 RESUME, | |
108 POLLEVENT, | |
109 CONTINUEEVENT | |
110 } Type; | |
111 | |
112 Type type; | |
113 union { | |
114 PeekArg peekArg; | |
115 PokeArg pokeArg; | |
116 BoolArg boolArg; | |
117 HandleArg handleArg; | |
118 SetContextArg setContextArg; | |
119 SelectorEntryArg selectorArg; | |
120 }; | |
121 }; | |
122 | |
123 #endif // #defined _MESSAGE_ |