Mercurial > hg > truffle
annotate src/share/vm/ci/ciKlass.hpp @ 20278:2c6ef90f030a
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
| author | stefank |
|---|---|
| date | Mon, 07 Jul 2014 10:12:40 +0200 |
| parents | 55fb97c4c58d |
| children | 7848fc12602b |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1999, 2013, 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; | |
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44 friend class ciMethodData; |
| 0 | 45 friend class ciObjArrayKlass; |
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46 friend class ciReceiverTypeData; |
| 0 | 47 |
| 48 private: | |
| 49 ciSymbol* _name; | |
| 50 jint _layout_helper; | |
| 51 | |
| 52 protected: | |
| 53 ciKlass(KlassHandle k_h, ciSymbol* name); | |
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54 ciKlass(ciSymbol* name, BasicType bt); |
| 0 | 55 |
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56 Klass* get_Klass() const { |
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57 Klass* k = (Klass*)_metadata; |
| 0 | 58 assert(k != NULL, "illegal use of unloaded klass"); |
| 59 return k; | |
| 60 } | |
| 61 | |
| 62 // Certain subklasses have an associated class loader. | |
| 63 virtual oop loader() { return NULL; } | |
| 64 virtual jobject loader_handle() { return NULL; } | |
| 65 | |
| 66 virtual oop protection_domain() { return NULL; } | |
| 67 virtual jobject protection_domain_handle() { return NULL; } | |
| 68 | |
| 69 const char* type_string() { return "ciKlass"; } | |
| 70 | |
| 71 void print_impl(outputStream* st); | |
| 72 | |
| 73 public: | |
| 74 ciKlass(KlassHandle k_h); | |
| 75 | |
| 76 // What is the name of this klass? | |
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77 ciSymbol* name() const { return _name; } |
| 0 | 78 |
| 79 // What is its layout helper value? | |
| 80 jint layout_helper() { return _layout_helper; } | |
| 81 | |
| 82 bool is_subtype_of(ciKlass* klass); | |
| 83 bool is_subclass_of(ciKlass* klass); | |
| 84 juint super_depth(); | |
| 85 juint super_check_offset(); | |
| 86 ciKlass* super_of_depth(juint i); | |
| 87 bool can_be_primary_super(); | |
| 88 static juint primary_super_limit() { return Klass::primary_super_limit(); } | |
| 89 | |
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90 // Is this ciObject the ciInstanceKlass representing java.lang.Object()? |
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91 virtual bool is_java_lang_Object() const { return false; } |
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92 |
| 0 | 93 // Get the shared parent of two klasses. |
| 94 ciKlass* least_common_ancestor(ciKlass* k); | |
| 95 | |
| 96 virtual bool is_interface() { | |
| 97 return false; | |
| 98 } | |
| 99 | |
| 100 virtual bool is_abstract() { | |
| 101 return false; | |
| 102 } | |
| 103 | |
| 104 // Does this type (array, class, interface) have no subtypes? | |
| 105 virtual bool is_leaf_type() { | |
| 106 return false; | |
| 107 } | |
| 108 | |
| 109 // Attempt to get a klass using this ciKlass's loader. | |
| 110 ciKlass* find_klass(ciSymbol* klass_name); | |
| 111 // Note: To find a class from its name string, use ciSymbol::make, | |
| 112 // but consider adding to vmSymbols.hpp instead. | |
| 113 | |
| 114 // Get the instance of java.lang.Class corresponding to this klass. | |
| 115 ciInstance* java_mirror(); | |
| 116 | |
| 117 // Fetch Klass::modifier_flags. | |
| 118 jint modifier_flags(); | |
| 119 | |
| 120 // Fetch Klass::access_flags. | |
| 121 jint access_flags(); | |
| 122 | |
| 123 // What kind of ciObject is this? | |
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124 bool is_klass() const { return true; } |
| 0 | 125 |
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126 virtual ciKlass* exact_klass() = 0; |
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127 |
| 0 | 128 void print_name_on(outputStream* st); |
| 129 }; | |
| 1972 | 130 |
| 131 #endif // SHARE_VM_CI_CIKLASS_HPP |