Mercurial > hg > truffle
annotate src/share/vm/ci/ciObjArrayKlass.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 | 4ca6dc0799b6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
17467
55fb97c4c58d
8029233: Update copyright year to match last edit in jdk8 hotspot repository for 2013
mikael
parents:
12875
diff
changeset
|
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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
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 // | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
34 // This class represents a Klass* in the HotSpot virtual machine |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
35 // whose Klass part is an ObjArrayKlass. |
| 0 | 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"); | |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
43 Klass* element_Klass = get_ObjArrayKlass()->bottom_klass(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
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, | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
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; | |
|
6831
d8ce2825b193
8000213: NPG: Should have renamed arrayKlass and typeArrayKlass
coleenp
parents:
6725
diff
changeset
|
86 Klass* element_Klass = get_ObjArrayKlass()->element_klass(); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
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, | |
|
3785
ddd894528dbc
7056328: JSR 292 invocation sometimes fails in adapters for types not on boot class path
jrose
parents:
2426
diff
changeset
|
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 | |
|
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
1972
diff
changeset
|
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 | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
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 } | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
3785
diff
changeset
|
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 } | |
|
12875
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
182 |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
183 ciKlass* ciObjArrayKlass::exact_klass() { |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
184 ciType* base = base_element_type(); |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
185 if (base->is_instance_klass()) { |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
186 ciInstanceKlass* ik = base->as_instance_klass(); |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
187 if (ik->exact_klass() != NULL) { |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
188 return this; |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
189 } |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
190 } else if (base->is_primitive_type()) { |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
191 return this; |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
192 } |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
193 return NULL; |
|
d13d7aba8c12
8023657: New type profiling points: arguments to call
roland
parents:
6831
diff
changeset
|
194 } |