Mercurial > hg > truffle
annotate src/share/vm/ci/ciObjArrayKlass.cpp @ 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 | ddd894528dbc |
| children | d8ce2825b193 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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 #include "precompiled.hpp" |
| 26 #include "ci/ciInstanceKlass.hpp" | |
| 27 #include "ci/ciObjArrayKlass.hpp" | |
| 28 #include "ci/ciSymbol.hpp" | |
| 29 #include "ci/ciUtilities.hpp" | |
| 30 #include "oops/objArrayKlass.hpp" | |
| 0 | 31 |
| 32 // ciObjArrayKlass | |
| 33 // | |
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34 // This class represents a Klass* in the HotSpot virtual machine |
| 0 | 35 // whose Klass part is an objArrayKlass. |
| 36 | |
| 37 // ------------------------------------------------------------------ | |
| 38 // ciObjArrayKlass::ciObjArrayKlass | |
| 39 // | |
| 40 // Constructor for loaded object array klasses. | |
| 41 ciObjArrayKlass::ciObjArrayKlass(KlassHandle h_k) : ciArrayKlass(h_k) { | |
| 42 assert(get_Klass()->oop_is_objArray(), "wrong type"); | |
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43 Klass* element_Klass = get_objArrayKlass()->bottom_klass(); |
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44 _base_element_klass = CURRENT_ENV->get_klass(element_Klass); |
| 0 | 45 assert(_base_element_klass->is_instance_klass() || |
| 46 _base_element_klass->is_type_array_klass(), "bad base klass"); | |
| 47 if (dimension() == 1) { | |
| 48 _element_klass = _base_element_klass; | |
| 49 } else { | |
| 50 _element_klass = NULL; | |
| 51 } | |
| 52 if (!ciObjectFactory::is_initialized()) { | |
| 53 assert(_element_klass->is_java_lang_Object(), "only arrays of object are shared"); | |
| 54 } | |
| 55 } | |
| 56 | |
| 57 // ------------------------------------------------------------------ | |
| 58 // ciObjArrayKlass::ciObjArrayKlass | |
| 59 // | |
| 60 // Constructor for unloaded object array klasses. | |
| 61 ciObjArrayKlass::ciObjArrayKlass(ciSymbol* array_name, | |
| 62 ciKlass* base_element_klass, | |
| 63 int dimension) | |
| 64 : ciArrayKlass(array_name, | |
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65 dimension, T_OBJECT) { |
| 0 | 66 _base_element_klass = base_element_klass; |
| 67 assert(_base_element_klass->is_instance_klass() || | |
| 68 _base_element_klass->is_type_array_klass(), "bad base klass"); | |
| 69 if (dimension == 1) { | |
| 70 _element_klass = base_element_klass; | |
| 71 } else { | |
| 72 _element_klass = NULL; | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 // ------------------------------------------------------------------ | |
| 77 // ciObjArrayKlass::element_klass | |
| 78 // | |
| 79 // What is the one-level element type of this array? | |
| 80 ciKlass* ciObjArrayKlass::element_klass() { | |
| 81 if (_element_klass == NULL) { | |
| 82 assert(dimension() > 1, "_element_klass should not be NULL"); | |
| 83 // Produce the element klass. | |
| 84 if (is_loaded()) { | |
| 85 VM_ENTRY_MARK; | |
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86 Klass* element_Klass = get_objArrayKlass()->element_klass(); |
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87 _element_klass = CURRENT_THREAD_ENV->get_klass(element_Klass); |
| 0 | 88 } else { |
| 89 VM_ENTRY_MARK; | |
| 90 // We are an unloaded array klass. Attempt to fetch our | |
| 91 // element klass by name. | |
| 92 _element_klass = CURRENT_THREAD_ENV->get_klass_by_name_impl( | |
| 93 this, | |
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94 constantPoolHandle(), |
| 0 | 95 construct_array_name(base_element_klass()->name(), |
| 96 dimension() - 1), | |
| 97 false); | |
| 98 } | |
| 99 } | |
| 100 return _element_klass; | |
| 101 } | |
| 102 | |
| 103 // ------------------------------------------------------------------ | |
| 104 // ciObjArrayKlass::construct_array_name | |
| 105 // | |
| 106 // Build an array name from an element name and a dimension. | |
| 107 ciSymbol* ciObjArrayKlass::construct_array_name(ciSymbol* element_name, | |
| 108 int dimension) { | |
| 109 EXCEPTION_CONTEXT; | |
| 110 int element_len = element_name->utf8_length(); | |
| 111 | |
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112 Symbol* base_name_sym = element_name->get_symbol(); |
| 0 | 113 char* name; |
| 114 | |
| 115 if (base_name_sym->byte_at(0) == '[' || | |
| 116 (base_name_sym->byte_at(0) == 'L' && // watch package name 'Lxx' | |
| 117 base_name_sym->byte_at(element_len-1) == ';')) { | |
| 118 | |
| 119 int new_len = element_len + dimension + 1; // for the ['s and '\0' | |
| 120 name = CURRENT_THREAD_ENV->name_buffer(new_len); | |
| 121 | |
| 122 int pos = 0; | |
| 123 for ( ; pos < dimension; pos++) { | |
| 124 name[pos] = '['; | |
| 125 } | |
| 126 strncpy(name+pos, (char*)element_name->base(), element_len); | |
| 127 name[new_len-1] = '\0'; | |
| 128 } else { | |
| 129 int new_len = 3 // for L, ;, and '\0' | |
| 130 + dimension // for ['s | |
| 131 + element_len; | |
| 132 | |
| 133 name = CURRENT_THREAD_ENV->name_buffer(new_len); | |
| 134 int pos = 0; | |
| 135 for ( ; pos < dimension; pos++) { | |
| 136 name[pos] = '['; | |
| 137 } | |
| 138 name[pos++] = 'L'; | |
| 139 strncpy(name+pos, (char*)element_name->base(), element_len); | |
| 140 name[new_len-2] = ';'; | |
| 141 name[new_len-1] = '\0'; | |
| 142 } | |
| 143 return ciSymbol::make(name); | |
| 144 } | |
| 145 | |
| 146 // ------------------------------------------------------------------ | |
| 147 // ciObjArrayKlass::make_impl | |
| 148 // | |
| 149 // Implementation of make. | |
| 150 ciObjArrayKlass* ciObjArrayKlass::make_impl(ciKlass* element_klass) { | |
| 151 | |
| 152 if (element_klass->is_loaded()) { | |
| 153 EXCEPTION_CONTEXT; | |
| 154 // The element klass is loaded | |
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155 Klass* array = element_klass->get_Klass()->array_klass(THREAD); |
| 0 | 156 if (HAS_PENDING_EXCEPTION) { |
| 157 CLEAR_PENDING_EXCEPTION; | |
| 158 CURRENT_THREAD_ENV->record_out_of_memory_failure(); | |
| 159 return ciEnv::unloaded_ciobjarrayklass(); | |
| 160 } | |
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161 return CURRENT_THREAD_ENV->get_obj_array_klass(array); |
| 0 | 162 } |
| 163 | |
| 164 // The array klass was unable to be made or the element klass was | |
| 165 // not loaded. | |
| 166 ciSymbol* array_name = construct_array_name(element_klass->name(), 1); | |
| 167 if (array_name == ciEnv::unloaded_cisymbol()) { | |
| 168 return ciEnv::unloaded_ciobjarrayklass(); | |
| 169 } | |
| 170 return | |
| 171 CURRENT_ENV->get_unloaded_klass(element_klass, array_name) | |
| 172 ->as_obj_array_klass(); | |
| 173 } | |
| 174 | |
| 175 // ------------------------------------------------------------------ | |
| 176 // ciObjArrayKlass::make | |
| 177 // | |
| 178 // Make an array klass corresponding to the specified primitive type. | |
| 179 ciObjArrayKlass* ciObjArrayKlass::make(ciKlass* element_klass) { | |
| 180 GUARDED_VM_ENTRY(return make_impl(element_klass);) | |
| 181 } |