Mercurial > hg > truffle
annotate src/share/vm/ci/ciKlass.cpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
| author | tschatzl |
|---|---|
| date | Fri, 10 Oct 2014 15:51:58 +0200 |
| parents | 55fb97c4c58d |
| children | d8041d695d19 |
| 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 #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) { | |
| 12871 | 69 assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii())); |
| 70 assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii())); | |
| 71 | |
| 0 | 72 // Check to see if the klasses are identical. |
| 73 if (this == that) { | |
| 74 return true; | |
| 75 } | |
| 76 | |
| 77 VM_ENTRY_MARK; | |
| 78 Klass* this_klass = get_Klass(); | |
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79 Klass* that_klass = that->get_Klass(); |
| 0 | 80 bool result = this_klass->is_subtype_of(that_klass); |
| 81 | |
| 82 return result; | |
| 83 } | |
| 84 | |
| 85 // ------------------------------------------------------------------ | |
| 86 // ciKlass::is_subclass_of | |
| 87 bool ciKlass::is_subclass_of(ciKlass* that) { | |
| 12871 | 88 assert(this->is_loaded(), err_msg("must be loaded: %s", this->name()->as_quoted_ascii())); |
| 89 assert(that->is_loaded(), err_msg("must be loaded: %s", that->name()->as_quoted_ascii())); | |
| 0 | 90 |
| 91 VM_ENTRY_MARK; | |
| 92 Klass* this_klass = get_Klass(); | |
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93 Klass* that_klass = that->get_Klass(); |
| 0 | 94 bool result = this_klass->is_subclass_of(that_klass); |
| 95 | |
| 96 return result; | |
| 97 } | |
| 98 | |
| 99 // ------------------------------------------------------------------ | |
| 100 // ciKlass::super_depth | |
| 101 juint ciKlass::super_depth() { | |
| 102 assert(is_loaded(), "must be loaded"); | |
| 103 | |
| 104 VM_ENTRY_MARK; | |
| 105 Klass* this_klass = get_Klass(); | |
| 106 return this_klass->super_depth(); | |
| 107 } | |
| 108 | |
| 109 // ------------------------------------------------------------------ | |
| 110 // ciKlass::super_check_offset | |
| 111 juint ciKlass::super_check_offset() { | |
| 112 assert(is_loaded(), "must be loaded"); | |
| 113 | |
| 114 VM_ENTRY_MARK; | |
| 115 Klass* this_klass = get_Klass(); | |
| 116 return this_klass->super_check_offset(); | |
| 117 } | |
| 118 | |
| 119 // ------------------------------------------------------------------ | |
| 120 // ciKlass::super_of_depth | |
| 121 ciKlass* ciKlass::super_of_depth(juint i) { | |
| 122 assert(is_loaded(), "must be loaded"); | |
| 123 | |
| 124 VM_ENTRY_MARK; | |
| 125 Klass* this_klass = get_Klass(); | |
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126 Klass* super = this_klass->primary_super_of_depth(i); |
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127 return (super != NULL) ? CURRENT_THREAD_ENV->get_klass(super) : NULL; |
| 0 | 128 } |
| 129 | |
| 130 // ------------------------------------------------------------------ | |
| 131 // ciKlass::can_be_primary_super | |
| 132 bool ciKlass::can_be_primary_super() { | |
| 133 assert(is_loaded(), "must be loaded"); | |
| 134 | |
| 135 VM_ENTRY_MARK; | |
| 136 Klass* this_klass = get_Klass(); | |
| 137 return this_klass->can_be_primary_super(); | |
| 138 } | |
| 139 | |
| 140 // ------------------------------------------------------------------ | |
| 141 // ciKlass::least_common_ancestor | |
| 142 // | |
| 143 // Get the shared parent of two klasses. | |
| 144 // | |
| 145 // Implementation note: this method currently goes "over the wall" | |
| 146 // and does all of the work on the VM side. It could be rewritten | |
| 147 // to use the super() method and do all of the work (aside from the | |
| 148 // lazy computation of super()) in native mode. This may be | |
| 149 // worthwhile if the compiler is repeatedly requesting the same lca | |
| 150 // computation or possibly if most of the superklasses have already | |
| 151 // been created as ciObjects anyway. Something to think about... | |
| 152 ciKlass* | |
| 153 ciKlass::least_common_ancestor(ciKlass* that) { | |
| 154 assert(is_loaded() && that->is_loaded(), "must be loaded"); | |
| 155 // Check to see if the klasses are identical. | |
| 156 if (this == that) { | |
| 157 return this; | |
| 158 } | |
| 159 | |
| 160 VM_ENTRY_MARK; | |
| 161 Klass* this_klass = get_Klass(); | |
| 162 Klass* that_klass = that->get_Klass(); | |
| 163 Klass* lca = this_klass->LCA(that_klass); | |
| 164 | |
| 165 // Many times the LCA will be either this_klass or that_klass. | |
| 166 // Treat these as special cases. | |
| 167 if (lca == that_klass) { | |
| 168 return that; | |
| 169 } | |
| 170 if (this_klass == lca) { | |
| 171 return this; | |
| 172 } | |
| 173 | |
| 174 // Create the ciInstanceKlass for the lca. | |
| 175 ciKlass* result = | |
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176 CURRENT_THREAD_ENV->get_klass(lca); |
| 0 | 177 |
| 178 return result; | |
| 179 } | |
| 180 | |
| 181 // ------------------------------------------------------------------ | |
| 182 // ciKlass::find_klass | |
| 183 // | |
| 184 // Find a klass using this klass's class loader. | |
| 185 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) { | |
| 186 assert(is_loaded(), "cannot find_klass through an unloaded klass"); | |
| 187 return CURRENT_ENV->get_klass_by_name(this, | |
| 188 klass_name, false); | |
| 189 } | |
| 190 | |
| 191 // ------------------------------------------------------------------ | |
| 192 // ciKlass::java_mirror | |
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193 // |
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194 // Get the instance of java.lang.Class corresponding to this klass. |
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195 // If it is an unloaded instance or array klass, return an unloaded |
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196 // mirror object of type Class. |
| 0 | 197 ciInstance* ciKlass::java_mirror() { |
| 198 GUARDED_VM_ENTRY( | |
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199 if (!is_loaded()) |
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200 return ciEnv::current()->get_unloaded_klass_mirror(this); |
| 0 | 201 oop java_mirror = get_Klass()->java_mirror(); |
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202 return CURRENT_ENV->get_instance(java_mirror); |
| 0 | 203 ) |
| 204 } | |
| 205 | |
| 206 // ------------------------------------------------------------------ | |
| 207 // ciKlass::modifier_flags | |
| 208 jint ciKlass::modifier_flags() { | |
| 209 assert(is_loaded(), "not loaded"); | |
| 210 GUARDED_VM_ENTRY( | |
| 211 return get_Klass()->modifier_flags(); | |
| 212 ) | |
| 213 } | |
| 214 | |
| 215 // ------------------------------------------------------------------ | |
| 216 // ciKlass::access_flags | |
| 217 jint ciKlass::access_flags() { | |
| 218 assert(is_loaded(), "not loaded"); | |
| 219 GUARDED_VM_ENTRY( | |
| 220 return get_Klass()->access_flags().as_int(); | |
| 221 ) | |
| 222 } | |
| 223 | |
| 224 // ------------------------------------------------------------------ | |
| 225 // ciKlass::print_impl | |
| 226 // | |
| 227 // Implementation of the print method | |
| 228 void ciKlass::print_impl(outputStream* st) { | |
| 229 st->print(" name="); | |
| 230 print_name_on(st); | |
| 231 } | |
| 232 | |
| 233 // ------------------------------------------------------------------ | |
| 234 // ciKlass::print_name | |
| 235 // | |
| 236 // Print the name of this klass | |
| 237 void ciKlass::print_name_on(outputStream* st) { | |
| 238 name()->print_symbol_on(st); | |
| 239 } |