Mercurial > hg > truffle
annotate src/share/vm/ci/ciKlass.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 | f95d63e2154a |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6725
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2 * Copyright (c) 1999, 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 * | |
|
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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_CI_CIKLASS_HPP |
| 26 #define SHARE_VM_CI_CIKLASS_HPP | |
| 27 | |
| 28 #include "ci/ciType.hpp" | |
| 29 | |
| 0 | 30 // ciKlass |
| 31 // | |
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32 // This class and its subclasses represent Klass*s in the |
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33 // HotSpot virtual machine. In the vm, each Klass* contains an |
| 0 | 34 // embedded Klass object. ciKlass is subclassed to explicitly |
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35 // represent the kind of Klass embedded in the Klass*. For |
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36 // example, a Klass* with an embedded objArrayKlass object is |
| 0 | 37 // represented in the ciObject hierarchy by the class |
| 38 // ciObjArrayKlass. | |
| 39 class ciKlass : public ciType { | |
| 40 CI_PACKAGE_ACCESS | |
| 41 friend class ciEnv; | |
| 42 friend class ciField; | |
| 43 friend class ciMethod; | |
| 44 friend class ciObjArrayKlass; | |
| 45 | |
| 46 private: | |
| 47 ciSymbol* _name; | |
| 48 jint _layout_helper; | |
| 49 | |
| 50 protected: | |
| 51 ciKlass(KlassHandle k_h, ciSymbol* name); | |
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52 ciKlass(ciSymbol* name, BasicType bt); |
| 0 | 53 |
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54 Klass* get_Klass() const { |
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55 Klass* k = (Klass*)_metadata; |
| 0 | 56 assert(k != NULL, "illegal use of unloaded klass"); |
| 57 return k; | |
| 58 } | |
| 59 | |
| 60 // Certain subklasses have an associated class loader. | |
| 61 virtual oop loader() { return NULL; } | |
| 62 virtual jobject loader_handle() { return NULL; } | |
| 63 | |
| 64 virtual oop protection_domain() { return NULL; } | |
| 65 virtual jobject protection_domain_handle() { return NULL; } | |
| 66 | |
| 67 const char* type_string() { return "ciKlass"; } | |
| 68 | |
| 69 void print_impl(outputStream* st); | |
| 70 | |
| 71 public: | |
| 72 ciKlass(KlassHandle k_h); | |
| 73 | |
| 74 // What is the name of this klass? | |
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75 ciSymbol* name() const { return _name; } |
| 0 | 76 |
| 77 // What is its layout helper value? | |
| 78 jint layout_helper() { return _layout_helper; } | |
| 79 | |
| 80 bool is_subtype_of(ciKlass* klass); | |
| 81 bool is_subclass_of(ciKlass* klass); | |
| 82 juint super_depth(); | |
| 83 juint super_check_offset(); | |
| 84 ciKlass* super_of_depth(juint i); | |
| 85 bool can_be_primary_super(); | |
| 86 static juint primary_super_limit() { return Klass::primary_super_limit(); } | |
| 87 | |
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88 // Is this ciObject the ciInstanceKlass representing java.lang.Object()? |
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89 virtual bool is_java_lang_Object() const { return false; } |
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90 |
| 0 | 91 // Get the shared parent of two klasses. |
| 92 ciKlass* least_common_ancestor(ciKlass* k); | |
| 93 | |
| 94 virtual bool is_interface() { | |
| 95 return false; | |
| 96 } | |
| 97 | |
| 98 virtual bool is_abstract() { | |
| 99 return false; | |
| 100 } | |
| 101 | |
| 102 // Does this type (array, class, interface) have no subtypes? | |
| 103 virtual bool is_leaf_type() { | |
| 104 return false; | |
| 105 } | |
| 106 | |
| 107 // Attempt to get a klass using this ciKlass's loader. | |
| 108 ciKlass* find_klass(ciSymbol* klass_name); | |
| 109 // Note: To find a class from its name string, use ciSymbol::make, | |
| 110 // but consider adding to vmSymbols.hpp instead. | |
| 111 | |
| 112 // Get the instance of java.lang.Class corresponding to this klass. | |
| 113 ciInstance* java_mirror(); | |
| 114 | |
| 115 // Fetch Klass::modifier_flags. | |
| 116 jint modifier_flags(); | |
| 117 | |
| 118 // Fetch Klass::access_flags. | |
| 119 jint access_flags(); | |
| 120 | |
| 121 // What kind of ciObject is this? | |
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122 bool is_klass() const { return true; } |
| 0 | 123 |
| 124 void print_name_on(outputStream* st); | |
| 125 }; | |
| 1972 | 126 |
| 127 #endif // SHARE_VM_CI_CIKLASS_HPP |