Mercurial > hg > truffle
annotate src/share/vm/runtime/vmStructs.hpp @ 4945:cfdfbeac0a5b
7145345: Code cache sweeper must cooperate with safepoints
Summary: Safepoint in the sweeper loop in necessary
Reviewed-by: kvn, never
author | iveresov |
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date | Wed, 15 Feb 2012 12:32:03 -0800 |
parents | 1d1603768966 |
children | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, 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 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_VMSTRUCTS_HPP |
26 #define SHARE_VM_RUNTIME_VMSTRUCTS_HPP | |
27 | |
28 #ifndef VM_STRUCTS_KERNEL | |
29 #include "utilities/debug.hpp" | |
30 #endif | |
31 #ifdef COMPILER1 | |
32 #include "c1/c1_Runtime1.hpp" | |
33 #endif | |
34 | |
0 | 35 // This table encapsulates the debugging information required by the |
36 // serviceability agent in order to run. Specifically, we need to | |
37 // understand the layout of certain C data structures (offsets, in | |
38 // bytes, of their fields.) | |
39 // | |
40 // There are alternatives for the design of this mechanism, including | |
41 // parsing platform-specific debugging symbols from a debug build into | |
42 // a program database. While this current mechanism can be considered | |
43 // to be a workaround for the inability to debug arbitrary C and C++ | |
44 // programs at the present time, it does have certain advantages. | |
45 // First, it is platform-independent, which will vastly simplify the | |
46 // initial bringup of the system both now and on future platforms. | |
47 // Second, it is embedded within the VM, as opposed to being in a | |
48 // separate program database; experience has shown that whenever | |
49 // portions of a system are decoupled, version skew is problematic. | |
50 // Third, generating a program database, for example for a product | |
51 // build, would probably require two builds to be done: the desired | |
52 // product build as well as an intermediary build with the PRODUCT | |
53 // flag turned on but also compiled with -g, leading to a doubling of | |
54 // the time required to get a serviceability agent-debuggable product | |
55 // build. Fourth, and very significantly, this table probably | |
56 // preserves more information about field types than stabs do; for | |
57 // example, it preserves the fact that a field is a "jlong" rather | |
58 // than transforming the type according to the typedef in jni_md.h, | |
59 // which allows the Java-side code to identify "Java-sized" fields in | |
60 // C++ data structures. If the symbol parsing mechanism was redone | |
61 // using stabs, it might still be necessary to have a table somewhere | |
62 // containing this information. | |
63 // | |
64 // Do not change the sizes or signedness of the integer values in | |
65 // these data structures; they are fixed over in the serviceability | |
66 // agent's Java code (for bootstrapping). | |
67 | |
68 typedef struct { | |
69 const char* typeName; // The type name containing the given field (example: "Klass") | |
70 const char* fieldName; // The field name within the type (example: "_name") | |
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71 const char* typeString; // Quoted name of the type of this field (example: "Symbol*"; |
0 | 72 // parsed in Java to ensure type correctness |
73 int32_t isStatic; // Indicates whether following field is an offset or an address | |
74 uint64_t offset; // Offset of field within structure; only used for nonstatic fields | |
75 void* address; // Address of field; only used for static fields | |
76 // ("offset" can not be reused because of apparent SparcWorks compiler bug | |
77 // in generation of initializer data) | |
78 } VMStructEntry; | |
79 | |
80 typedef struct { | |
81 const char* typeName; // Type name (example: "methodOopDesc") | |
82 const char* superclassName; // Superclass name, or null if none (example: "oopDesc") | |
83 int32_t isOopType; // Does this type represent an oop typedef? (i.e., "methodOop" or | |
84 // "klassOop", but NOT "methodOopDesc") | |
85 int32_t isIntegerType; // Does this type represent an integer type (of arbitrary size)? | |
86 int32_t isUnsigned; // If so, is it unsigned? | |
87 uint64_t size; // Size, in bytes, of the type | |
88 } VMTypeEntry; | |
89 | |
90 typedef struct { | |
91 const char* name; // Name of constant (example: "_thread_in_native") | |
92 int32_t value; // Value of constant | |
93 } VMIntConstantEntry; | |
94 | |
95 typedef struct { | |
96 const char* name; // Name of constant (example: "_thread_in_native") | |
97 uint64_t value; // Value of constant | |
98 } VMLongConstantEntry; | |
99 | |
100 // This class is a friend of most classes, to be able to access | |
101 // private fields | |
102 class VMStructs { | |
103 public: | |
104 // The last entry is identified over in the serviceability agent by | |
105 // the fact that it has a NULL fieldName | |
106 static VMStructEntry localHotSpotVMStructs[]; | |
107 | |
108 // The last entry is identified over in the serviceability agent by | |
109 // the fact that it has a NULL typeName | |
110 static VMTypeEntry localHotSpotVMTypes[]; | |
111 | |
112 // Table of integer constants required by the serviceability agent. | |
113 // The last entry is identified over in the serviceability agent by | |
114 // the fact that it has a NULL typeName | |
115 static VMIntConstantEntry localHotSpotVMIntConstants[]; | |
116 | |
117 // Table of long constants required by the serviceability agent. | |
118 // The last entry is identified over in the serviceability agent by | |
119 // the fact that it has a NULL typeName | |
120 static VMLongConstantEntry localHotSpotVMLongConstants[]; | |
121 | |
122 // This is used to run any checking code necessary for validation of | |
123 // the data structure (debug build only) | |
124 static void init(); | |
125 | |
126 private: | |
127 // Look up a type in localHotSpotVMTypes using strcmp() (debug build only). | |
128 // Returns 1 if found, 0 if not. | |
129 // debug_only(static int findType(const char* typeName);) | |
130 static int findType(const char* typeName); | |
131 }; | |
1972 | 132 |
133 #endif // SHARE_VM_RUNTIME_VMSTRUCTS_HPP |