Mercurial > hg > truffle
annotate src/share/vm/ci/ciKlass.cpp @ 8733:9def4075da6d
8008079: G1: Add nextObject routine to CMBitMapRO and replace nextWord
Summary: Update the task local finger to the start of the next object when marking aborts, in order to avoid the redundant scanning of all 0's when the marking task restarts, if otherwise updating to the next word. In addition, reuse the routine nextObject() in routine iterate().
Reviewed-by: johnc, ysr
Contributed-by: tamao <tao.mao@oracle.com>
| author | tamao |
|---|---|
| date | Tue, 05 Mar 2013 15:36:56 -0800 |
| parents | da91efe96a93 |
| children | e522a00b91aa 6171eb9da4fd |
| 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/ciKlass.hpp" | |
| 27 #include "ci/ciSymbol.hpp" | |
| 28 #include "ci/ciUtilities.hpp" | |
| 29 #include "oops/oop.inline.hpp" | |
| 0 | 30 |
| 31 // ciKlass | |
| 32 // | |
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33 // This class represents a Klass* in the HotSpot virtual |
| 0 | 34 // machine. |
| 35 | |
| 36 // ------------------------------------------------------------------ | |
| 37 // ciKlass::ciKlass | |
| 38 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) { | |
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39 assert(get_Klass()->is_klass(), "wrong type"); |
| 0 | 40 Klass* k = get_Klass(); |
| 41 _layout_helper = k->layout_helper(); | |
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42 Symbol* klass_name = k->name(); |
| 0 | 43 assert(klass_name != NULL, "wrong ciKlass constructor"); |
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44 _name = CURRENT_ENV->get_symbol(klass_name); |
| 0 | 45 } |
| 46 | |
| 47 // ------------------------------------------------------------------ | |
| 48 // ciKlass::ciKlass | |
| 49 // | |
| 50 // Nameless klass variant. | |
| 51 ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) { | |
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52 assert(get_Klass()->is_klass(), "wrong type"); |
| 0 | 53 _name = name; |
| 54 _layout_helper = Klass::_lh_neutral_value; | |
| 55 } | |
| 56 | |
| 57 // ------------------------------------------------------------------ | |
| 58 // ciKlass::ciKlass | |
| 59 // | |
| 60 // Unloaded klass variant. | |
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61 ciKlass::ciKlass(ciSymbol* name, BasicType bt) : ciType(bt) { |
| 0 | 62 _name = name; |
| 63 _layout_helper = Klass::_lh_neutral_value; | |
| 64 } | |
| 65 | |
| 66 // ------------------------------------------------------------------ | |
| 67 // ciKlass::is_subtype_of | |
| 68 bool ciKlass::is_subtype_of(ciKlass* that) { | |
| 69 assert(is_loaded() && that->is_loaded(), "must be loaded"); | |
| 70 // Check to see if the klasses are identical. | |
| 71 if (this == that) { | |
| 72 return true; | |
| 73 } | |
| 74 | |
| 75 VM_ENTRY_MARK; | |
| 76 Klass* this_klass = get_Klass(); | |
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77 Klass* that_klass = that->get_Klass(); |
| 0 | 78 bool result = this_klass->is_subtype_of(that_klass); |
| 79 | |
| 80 return result; | |
| 81 } | |
| 82 | |
| 83 // ------------------------------------------------------------------ | |
| 84 // ciKlass::is_subclass_of | |
| 85 bool ciKlass::is_subclass_of(ciKlass* that) { | |
| 86 assert(is_loaded() && that->is_loaded(), "must be loaded"); | |
| 87 // Check to see if the klasses are identical. | |
| 88 | |
| 89 VM_ENTRY_MARK; | |
| 90 Klass* this_klass = get_Klass(); | |
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91 Klass* that_klass = that->get_Klass(); |
| 0 | 92 bool result = this_klass->is_subclass_of(that_klass); |
| 93 | |
| 94 return result; | |
| 95 } | |
| 96 | |
| 97 // ------------------------------------------------------------------ | |
| 98 // ciKlass::super_depth | |
| 99 juint ciKlass::super_depth() { | |
| 100 assert(is_loaded(), "must be loaded"); | |
| 101 | |
| 102 VM_ENTRY_MARK; | |
| 103 Klass* this_klass = get_Klass(); | |
| 104 return this_klass->super_depth(); | |
| 105 } | |
| 106 | |
| 107 // ------------------------------------------------------------------ | |
| 108 // ciKlass::super_check_offset | |
| 109 juint ciKlass::super_check_offset() { | |
| 110 assert(is_loaded(), "must be loaded"); | |
| 111 | |
| 112 VM_ENTRY_MARK; | |
| 113 Klass* this_klass = get_Klass(); | |
| 114 return this_klass->super_check_offset(); | |
| 115 } | |
| 116 | |
| 117 // ------------------------------------------------------------------ | |
| 118 // ciKlass::super_of_depth | |
| 119 ciKlass* ciKlass::super_of_depth(juint i) { | |
| 120 assert(is_loaded(), "must be loaded"); | |
| 121 | |
| 122 VM_ENTRY_MARK; | |
| 123 Klass* this_klass = get_Klass(); | |
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124 Klass* super = this_klass->primary_super_of_depth(i); |
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125 return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL; |
| 0 | 126 } |
| 127 | |
| 128 // ------------------------------------------------------------------ | |
| 129 // ciKlass::can_be_primary_super | |
| 130 bool ciKlass::can_be_primary_super() { | |
| 131 assert(is_loaded(), "must be loaded"); | |
| 132 | |
| 133 VM_ENTRY_MARK; | |
| 134 Klass* this_klass = get_Klass(); | |
| 135 return this_klass->can_be_primary_super(); | |
| 136 } | |
| 137 | |
| 138 // ------------------------------------------------------------------ | |
| 139 // ciKlass::least_common_ancestor | |
| 140 // | |
| 141 // Get the shared parent of two klasses. | |
| 142 // | |
| 143 // Implementation note: this method currently goes "over the wall" | |
| 144 // and does all of the work on the VM side. It could be rewritten | |
| 145 // to use the super() method and do all of the work (aside from the | |
| 146 // lazy computation of super()) in native mode. This may be | |
| 147 // worthwhile if the compiler is repeatedly requesting the same lca | |
| 148 // computation or possibly if most of the superklasses have already | |
| 149 // been created as ciObjects anyway. Something to think about... | |
| 150 ciKlass* | |
| 151 ciKlass::least_common_ancestor(ciKlass* that) { | |
| 152 assert(is_loaded() && that->is_loaded(), "must be loaded"); | |
| 153 // Check to see if the klasses are identical. | |
| 154 if (this == that) { | |
| 155 return this; | |
| 156 } | |
| 157 | |
| 158 VM_ENTRY_MARK; | |
| 159 Klass* this_klass = get_Klass(); | |
| 160 Klass* that_klass = that->get_Klass(); | |
| 161 Klass* lca = this_klass->LCA(that_klass); | |
| 162 | |
| 163 // Many times the LCA will be either this_klass or that_klass. | |
| 164 // Treat these as special cases. | |
| 165 if (lca == that_klass) { | |
| 166 return that; | |
| 167 } | |
| 168 if (this_klass == lca) { | |
| 169 return this; | |
| 170 } | |
| 171 | |
| 172 // Create the ciInstanceKlass for the lca. | |
| 173 ciKlass* result = | |
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174 CURRENT_THREAD_ENV->get_klass(lca); |
| 0 | 175 |
| 176 return result; | |
| 177 } | |
| 178 | |
| 179 // ------------------------------------------------------------------ | |
| 180 // ciKlass::find_klass | |
| 181 // | |
| 182 // Find a klass using this klass's class loader. | |
| 183 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { | |
| 184 assert(is_loaded(), "cannot find_klass through an unloaded klass"); | |
| 185 return CURRENT_ENV->get_klass_by_name(this, | |
| 186 klass_name, false); | |
| 187 } | |
| 188 | |
| 189 // ------------------------------------------------------------------ | |
| 190 // ciKlass::java_mirror | |
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191 // |
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192 // Get the instance of java.lang.Class corresponding to this klass. |
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193 // If it is an unloaded instance or array klass, return an unloaded |
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194 // mirror object of type Class. |
| 0 | 195 ciInstance* ciKlass::java_mirror() { |
| 196 GUARDED_VM_ENTRY( | |
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197 if (!is_loaded()) |
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198 return ciEnv::current()->get_unloaded_klass_mirror(this); |
| 0 | 199 oop java_mirror = get_Klass()->java_mirror(); |
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200 return CURRENT_ENV->get_instance(java_mirror); |
| 0 | 201 ) |
| 202 } | |
| 203 | |
| 204 // ------------------------------------------------------------------ | |
| 205 // ciKlass::modifier_flags | |
| 206 jint ciKlass::modifier_flags() { | |
| 207 assert(is_loaded(), "not loaded"); | |
| 208 GUARDED_VM_ENTRY( | |
| 209 return get_Klass()->modifier_flags(); | |
| 210 ) | |
| 211 } | |
| 212 | |
| 213 // ------------------------------------------------------------------ | |
| 214 // ciKlass::access_flags | |
| 215 jint ciKlass::access_flags() { | |
| 216 assert(is_loaded(), "not loaded"); | |
| 217 GUARDED_VM_ENTRY( | |
| 218 return get_Klass()->access_flags().as_int(); | |
| 219 ) | |
| 220 } | |
| 221 | |
| 222 // ------------------------------------------------------------------ | |
| 223 // ciKlass::print_impl | |
| 224 // | |
| 225 // Implementation of the print method | |
| 226 void ciKlass::print_impl(outputStream* st) { | |
| 227 st->print(" name="); | |
| 228 print_name_on(st); | |
| 229 } | |
| 230 | |
| 231 // ------------------------------------------------------------------ | |
| 232 // ciKlass::print_name | |
| 233 // | |
| 234 // Print the name of this klass | |
| 235 void ciKlass::print_name_on(outputStream* st) { | |
| 236 name()->print_symbol_on(st); | |
| 237 } |