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annotate src/share/vm/oops/arrayKlass.hpp @ 21836:b517d3a9aebf jdk8u31-b31
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date | Thu, 18 Dec 2014 14:30:02 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP |
26 #define SHARE_VM_OOPS_ARRAYKLASS_HPP | |
27 | |
28 #include "memory/universe.hpp" | |
29 #include "oops/klass.hpp" | |
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30 |
18046 | 31 class fieldDescriptor; |
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32 class klassVtable; |
1972 | 33 |
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34 // ArrayKlass is the abstract baseclass for all array classes |
0 | 35 |
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36 class ArrayKlass: public Klass { |
0 | 37 friend class VMStructs; |
38 private: | |
39 int _dimension; // This is n'th-dimensional array. | |
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40 Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). |
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41 Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). |
0 | 42 int _vtable_len; // size of vtable for this klass |
43 oop _component_mirror; // component type, as a java/lang/Class | |
44 | |
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45 protected: |
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46 // Constructors |
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47 // The constructor with the Symbol argument does the real array |
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48 // initialization, the other is a dummy |
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49 ArrayKlass(Symbol* name); |
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50 ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); } |
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51 |
0 | 52 public: |
53 // Testing operation | |
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54 bool oop_is_array_slow() const { return true; } |
0 | 55 |
56 // Instance variables | |
57 int dimension() const { return _dimension; } | |
58 void set_dimension(int dimension) { _dimension = dimension; } | |
59 | |
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60 Klass* higher_dimension() const { return _higher_dimension; } |
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61 void set_higher_dimension(Klass* k) { _higher_dimension = k; } |
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62 Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;} |
0 | 63 |
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64 Klass* lower_dimension() const { return _lower_dimension; } |
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65 void set_lower_dimension(Klass* k) { _lower_dimension = k; } |
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66 Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;} |
0 | 67 |
68 // offset of first element, including any padding for the sake of alignment | |
69 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } | |
70 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } | |
71 // type of elements (T_OBJECT for both oop arrays and array-arrays) | |
72 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } | |
73 | |
74 oop component_mirror() const { return _component_mirror; } | |
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75 void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); } |
0 | 76 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;} |
77 | |
78 // Compiler/Interpreter offset | |
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79 static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); } |
0 | 80 |
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81 virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } |
0 | 82 |
83 // Allocation | |
84 // Sizes points to the first dimension of the array, subsequent dimensions | |
85 // are always in higher memory. The callers of these set that up. | |
86 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); | |
87 objArrayOop allocate_arrayArray(int n, int length, TRAPS); | |
88 | |
18046 | 89 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
90 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; | |
91 | |
0 | 92 // Lookup operations |
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93 Method* uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const; |
0 | 94 |
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95 // Casting from Klass* |
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96 static ArrayKlass* cast(Klass* k) { |
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97 assert(k->oop_is_array(), "cast to ArrayKlass"); |
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98 return (ArrayKlass*) k; |
0 | 99 } |
100 | |
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101 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
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102 bool compute_is_subtype_of(Klass* k); |
0 | 103 |
104 // Sizing | |
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105 static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; } |
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106 static int static_size(int header_size); |
0 | 107 |
7956 | 108 #if INCLUDE_SERVICES |
109 virtual void collect_statistics(KlassSizeStats *sz) const { | |
110 Klass::collect_statistics(sz); | |
111 // Do nothing for now, but remember to modify if you add new | |
112 // stuff to ArrayKlass. | |
113 } | |
114 #endif | |
115 | |
0 | 116 // Java vtable |
117 klassVtable* vtable() const; // return new klassVtable | |
118 int vtable_length() const { return _vtable_len; } | |
119 static int base_vtable_length() { return Universe::base_vtable_size(); } | |
120 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } | |
121 protected: | |
122 inline intptr_t* start_of_vtable() const; | |
123 | |
124 public: | |
125 // Iterators | |
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126 void array_klasses_do(void f(Klass* k)); |
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127 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); |
0 | 128 |
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129 // GC support |
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130 virtual void oops_do(OopClosure* cl); |
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131 |
0 | 132 // Return a handle. |
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133 static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS); |
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134 |
0 | 135 |
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136 // jvm support |
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137 jint compute_modifier_flags(TRAPS) const; |
0 | 138 |
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139 // JVMTI support |
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140 jint jvmti_class_status() const; |
0 | 141 |
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142 // CDS support - remove and restore oops from metadata. Oops are not shared. |
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143 virtual void remove_unshareable_info(); |
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144 virtual void restore_unshareable_info(TRAPS); |
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145 |
0 | 146 // Printing |
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147 void print_on(outputStream* st) const; |
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148 void print_value_on(outputStream* st) const; |
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149 |
0 | 150 void oop_print_on(oop obj, outputStream* st); |
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151 |
0 | 152 // Verification |
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153 void verify_on(outputStream* st); |
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154 |
0 | 155 void oop_verify_on(oop obj, outputStream* st); |
156 }; | |
1972 | 157 |
158 #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP |