Mercurial > hg > truffle
annotate src/share/vm/ci/ciInstance.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:
12190
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:
1142
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1142
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:
1142
diff
changeset
|
21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "ci/ciConstant.hpp" | |
| 27 #include "ci/ciField.hpp" | |
| 28 #include "ci/ciInstance.hpp" | |
| 29 #include "ci/ciInstanceKlass.hpp" | |
| 30 #include "ci/ciUtilities.hpp" | |
| 31 #include "classfile/systemDictionary.hpp" | |
| 32 #include "oops/oop.inline.hpp" | |
| 0 | 33 |
| 34 // ciInstance | |
| 35 // | |
| 36 // This class represents an instanceOop in the HotSpot virtual | |
| 37 // machine. | |
| 38 | |
| 39 // ------------------------------------------------------------------ | |
| 40 // ciObject::java_mirror_type | |
| 41 ciType* ciInstance::java_mirror_type() { | |
| 42 VM_ENTRY_MARK; | |
| 43 oop m = get_oop(); | |
| 44 // Return NULL if it is not java.lang.Class. | |
| 1142 | 45 if (m == NULL || m->klass() != SystemDictionary::Class_klass()) { |
| 0 | 46 return NULL; |
| 47 } | |
| 48 // Return either a primitive type or a klass. | |
| 49 if (java_lang_Class::is_primitive(m)) { | |
| 50 return ciType::make(java_lang_Class::primitive_type(m)); | |
| 51 } else { | |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2467
diff
changeset
|
52 Klass* k = java_lang_Class::as_Klass(m); |
| 0 | 53 assert(k != NULL, ""); |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2467
diff
changeset
|
54 return CURRENT_THREAD_ENV->get_klass(k); |
| 0 | 55 } |
| 56 } | |
| 57 | |
| 58 // ------------------------------------------------------------------ | |
| 59 // ciInstance::field_value | |
| 60 // | |
| 61 // Constant value of a field. | |
| 62 ciConstant ciInstance::field_value(ciField* field) { | |
|
12165
59982ff9e0ec
8022283: Assertion failed: assert(is_loaded() && field->holder()->is_loaded() && klass()->is_subclass_of (field->holder())) failed: invalid access
rbackman
parents:
6725
diff
changeset
|
63 assert(is_loaded(), "invalid access - must be loaded"); |
|
59982ff9e0ec
8022283: Assertion failed: assert(is_loaded() && field->holder()->is_loaded() && klass()->is_subclass_of (field->holder())) failed: invalid access
rbackman
parents:
6725
diff
changeset
|
64 assert(field->holder()->is_loaded(), "invalid access - holder must be loaded"); |
|
59982ff9e0ec
8022283: Assertion failed: assert(is_loaded() && field->holder()->is_loaded() && klass()->is_subclass_of (field->holder())) failed: invalid access
rbackman
parents:
6725
diff
changeset
|
65 assert(klass()->is_subclass_of(field->holder()), "invalid access - must be subclass"); |
|
59982ff9e0ec
8022283: Assertion failed: assert(is_loaded() && field->holder()->is_loaded() && klass()->is_subclass_of (field->holder())) failed: invalid access
rbackman
parents:
6725
diff
changeset
|
66 |
| 0 | 67 VM_ENTRY_MARK; |
| 68 ciConstant result; | |
|
2467
3fa3c7e4d4f3
7035161: assert(!o->is_null_object()) failed: null object not yet handled here.
never
parents:
2376
diff
changeset
|
69 Handle obj = get_oop(); |
|
3fa3c7e4d4f3
7035161: assert(!o->is_null_object()) failed: null object not yet handled here.
never
parents:
2376
diff
changeset
|
70 assert(!obj.is_null(), "bad oop"); |
| 0 | 71 BasicType field_btype = field->type()->basic_type(); |
| 72 int offset = field->offset(); | |
| 73 | |
| 74 switch(field_btype) { | |
| 75 case T_BYTE: | |
| 76 return ciConstant(field_btype, obj->byte_field(offset)); | |
| 77 break; | |
| 78 case T_CHAR: | |
| 79 return ciConstant(field_btype, obj->char_field(offset)); | |
| 80 break; | |
| 81 case T_SHORT: | |
| 82 return ciConstant(field_btype, obj->short_field(offset)); | |
| 83 break; | |
| 84 case T_BOOLEAN: | |
| 85 return ciConstant(field_btype, obj->bool_field(offset)); | |
| 86 break; | |
| 87 case T_INT: | |
| 88 return ciConstant(field_btype, obj->int_field(offset)); | |
| 89 break; | |
| 90 case T_FLOAT: | |
| 91 return ciConstant(obj->float_field(offset)); | |
| 92 break; | |
| 93 case T_DOUBLE: | |
| 94 return ciConstant(obj->double_field(offset)); | |
| 95 break; | |
| 96 case T_LONG: | |
| 97 return ciConstant(obj->long_field(offset)); | |
| 98 break; | |
| 99 case T_OBJECT: | |
| 100 case T_ARRAY: | |
| 101 { | |
| 102 oop o = obj->obj_field(offset); | |
| 103 | |
| 104 // A field will be "constant" if it is known always to be | |
| 105 // a non-null reference to an instance of a particular class, | |
| 106 // or to a particular array. This can happen even if the instance | |
| 107 // or array is not perm. In such a case, an "unloaded" ciArray | |
| 108 // or ciInstance is created. The compiler may be able to use | |
| 109 // information about the object's class (which is exact) or length. | |
| 110 | |
| 111 if (o == NULL) { | |
| 112 return ciConstant(field_btype, ciNullObject::make()); | |
| 113 } else { | |
| 114 return ciConstant(field_btype, CURRENT_ENV->get_object(o)); | |
| 115 } | |
| 116 } | |
| 117 } | |
| 118 ShouldNotReachHere(); | |
| 119 // to shut up the compiler | |
| 120 return ciConstant(); | |
| 121 } | |
| 122 | |
| 123 // ------------------------------------------------------------------ | |
| 124 // ciInstance::field_value_by_offset | |
| 125 // | |
| 126 // Constant value of a field at the specified offset. | |
| 127 ciConstant ciInstance::field_value_by_offset(int field_offset) { | |
| 128 ciInstanceKlass* ik = klass()->as_instance_klass(); | |
| 129 ciField* field = ik->get_field_by_offset(field_offset, false); | |
|
12190
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
12165
diff
changeset
|
130 if (field == NULL) |
|
edb5ab0f3fe5
8001107: @Stable annotation for constant folding of lazily evaluated variables
vlivanov
parents:
12165
diff
changeset
|
131 return ciConstant(); // T_ILLEGAL |
| 0 | 132 return field_value(field); |
| 133 } | |
| 134 | |
| 135 // ------------------------------------------------------------------ | |
| 136 // ciInstance::print_impl | |
| 137 // | |
| 138 // Implementation of the print method. | |
| 139 void ciInstance::print_impl(outputStream* st) { | |
| 140 st->print(" type="); | |
| 141 klass()->print(st); | |
| 142 } | |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
1972
diff
changeset
|
143 |
|
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
1972
diff
changeset
|
144 |
|
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
1972
diff
changeset
|
145 ciKlass* ciInstance::java_lang_Class_klass() { |
|
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
1972
diff
changeset
|
146 VM_ENTRY_MARK; |
|
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
2467
diff
changeset
|
147 return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass(); |
|
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
1972
diff
changeset
|
148 } |