Mercurial > hg > truffle
annotate src/share/vm/runtime/vmStructs.hpp @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
| author | coleenp |
|---|---|
| date | Sat, 01 Sep 2012 13:25:18 -0400 |
| parents | 1d1603768966 |
| children | 7c15faa95ce7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2426
diff
changeset
|
2 * Copyright (c) 2000, 2012, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
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") | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1972
diff
changeset
|
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 { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2426
diff
changeset
|
81 const char* typeName; // Type name (example: "Method") |
| 0 | 82 const char* superclassName; // Superclass name, or null if none (example: "oopDesc") |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2426
diff
changeset
|
83 int32_t isOopType; // Does this type represent an oop typedef? (i.e., "Method*" or |
|
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2426
diff
changeset
|
84 // "Klass*", but NOT "Method") |
| 0 | 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 |