Mercurial > hg > truffle
annotate src/share/vm/ci/ciInstance.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 | 59982ff9e0ec |
| 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/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 { | |
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52 Klass* k = java_lang_Class::as_Klass(m); |
| 0 | 53 assert(k != NULL, ""); |
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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) { | |
| 63 assert(is_loaded() && | |
| 64 field->holder()->is_loaded() && | |
| 65 klass()->is_subclass_of(field->holder()), | |
| 66 "invalid access"); | |
| 67 VM_ENTRY_MARK; | |
| 68 ciConstant result; | |
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69 Handle obj = get_oop(); |
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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); | |
| 130 return field_value(field); | |
| 131 } | |
| 132 | |
| 133 // ------------------------------------------------------------------ | |
| 134 // ciInstance::print_impl | |
| 135 // | |
| 136 // Implementation of the print method. | |
| 137 void ciInstance::print_impl(outputStream* st) { | |
| 138 st->print(" type="); | |
| 139 klass()->print(st); | |
| 140 } | |
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141 |
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142 |
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143 ciKlass* ciInstance::java_lang_Class_klass() { |
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144 VM_ENTRY_MARK; |
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145 return CURRENT_ENV->get_metadata(java_lang_Class::as_Klass(get_oop()))->as_klass(); |
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146 } |