Tue, 18 Jun 2013 12:31:07 -0700
8015237: Parallelize string table scanning during strong root processing
Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti
1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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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.
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23 */
25 #ifndef SHARE_VM_CI_CIINSTANCEKLASS_HPP
26 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP
28 #include "ci/ciConstantPoolCache.hpp"
29 #include "ci/ciFlags.hpp"
30 #include "ci/ciKlass.hpp"
31 #include "ci/ciSymbol.hpp"
33 // ciInstanceKlass
34 //
35 // This class represents a Klass* in the HotSpot virtual machine
36 // whose Klass part is an InstanceKlass. It may or may not
37 // be loaded.
38 class ciInstanceKlass : public ciKlass {
39 CI_PACKAGE_ACCESS
40 friend class ciBytecodeStream;
41 friend class ciEnv;
42 friend class ciExceptionHandler;
43 friend class ciMethod;
44 friend class ciField;
46 private:
47 jobject _loader;
48 jobject _protection_domain;
50 InstanceKlass::ClassState _init_state; // state of class
51 bool _is_shared;
52 bool _has_finalizer;
53 bool _has_subklass;
54 bool _has_nonstatic_fields;
56 ciFlags _flags;
57 jint _nonstatic_field_size;
58 jint _nonstatic_oop_map_size;
60 // Lazy fields get filled in only upon request.
61 ciInstanceKlass* _super;
62 ciInstance* _java_mirror;
64 ciConstantPoolCache* _field_cache; // cached map index->field
65 GrowableArray<ciField*>* _nonstatic_fields;
67 // The possible values of the _implementor fall into following three cases:
68 // NULL: no implementor.
69 // A ciInstanceKlass that's not itself: one implementor.
70 // Itsef: more than one implementors.
71 ciInstanceKlass* _implementor;
73 GrowableArray<ciField*>* _non_static_fields;
75 protected:
76 ciInstanceKlass(KlassHandle h_k);
77 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
79 InstanceKlass* get_instanceKlass() const {
80 return (InstanceKlass*)get_Klass();
81 }
83 oop loader();
84 jobject loader_handle();
86 oop protection_domain();
87 jobject protection_domain_handle();
89 const char* type_string() { return "ciInstanceKlass"; }
91 bool is_in_package_impl(const char* packagename, int len);
93 void print_impl(outputStream* st);
95 ciConstantPoolCache* field_cache();
97 bool is_shared() { return _is_shared; }
99 void compute_shared_init_state();
100 bool compute_shared_has_subklass();
101 int compute_nonstatic_fields();
102 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
104 // Update the init_state for shared klasses
105 void update_if_shared(InstanceKlass::ClassState expected) {
106 if (_is_shared && _init_state != expected) {
107 if (is_loaded()) compute_shared_init_state();
108 }
109 }
111 public:
112 // Has this klass been initialized?
113 bool is_initialized() {
114 update_if_shared(InstanceKlass::fully_initialized);
115 return _init_state == InstanceKlass::fully_initialized;
116 }
117 // Is this klass being initialized?
118 bool is_being_initialized() {
119 update_if_shared(InstanceKlass::being_initialized);
120 return _init_state == InstanceKlass::being_initialized;
121 }
122 // Has this klass been linked?
123 bool is_linked() {
124 update_if_shared(InstanceKlass::linked);
125 return _init_state >= InstanceKlass::linked;
126 }
128 // General klass information.
129 ciFlags flags() {
130 assert(is_loaded(), "must be loaded");
131 return _flags;
132 }
133 bool has_finalizer() {
134 assert(is_loaded(), "must be loaded");
135 return _has_finalizer; }
136 bool has_subklass() {
137 assert(is_loaded(), "must be loaded");
138 if (_is_shared && !_has_subklass) {
139 if (flags().is_final()) {
140 return false;
141 } else {
142 return compute_shared_has_subklass();
143 }
144 }
145 return _has_subklass;
146 }
147 jint size_helper() {
148 return (Klass::layout_helper_size_in_bytes(layout_helper())
149 >> LogHeapWordSize);
150 }
151 jint nonstatic_field_size() {
152 assert(is_loaded(), "must be loaded");
153 return _nonstatic_field_size; }
154 jint has_nonstatic_fields() {
155 assert(is_loaded(), "must be loaded");
156 return _has_nonstatic_fields; }
157 jint nonstatic_oop_map_size() {
158 assert(is_loaded(), "must be loaded");
159 return _nonstatic_oop_map_size; }
160 ciInstanceKlass* super();
161 jint nof_implementors() {
162 ciInstanceKlass* impl;
163 assert(is_loaded(), "must be loaded");
164 impl = implementor();
165 if (impl == NULL) {
166 return 0;
167 } else if (impl != this) {
168 return 1;
169 } else {
170 return 2;
171 }
172 }
174 ciInstanceKlass* get_canonical_holder(int offset);
175 ciField* get_field_by_offset(int field_offset, bool is_static);
176 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
178 GrowableArray<ciField*>* non_static_fields();
180 // total number of nonstatic fields (including inherited):
181 int nof_nonstatic_fields() {
182 if (_nonstatic_fields == NULL)
183 return compute_nonstatic_fields();
184 else
185 return _nonstatic_fields->length();
186 }
187 // nth nonstatic field (presented by ascending address)
188 ciField* nonstatic_field_at(int i) {
189 assert(_nonstatic_fields != NULL, "");
190 return _nonstatic_fields->at(i);
191 }
193 ciInstanceKlass* unique_concrete_subklass();
194 bool has_finalizable_subclass();
196 bool contains_field_offset(int offset) {
197 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
198 }
200 // Get the instance of java.lang.Class corresponding to
201 // this klass. This instance is used for locking of
202 // synchronized static methods of this klass.
203 ciInstance* java_mirror();
205 // Java access flags
206 bool is_public () { return flags().is_public(); }
207 bool is_final () { return flags().is_final(); }
208 bool is_super () { return flags().is_super(); }
209 bool is_interface () { return flags().is_interface(); }
210 bool is_abstract () { return flags().is_abstract(); }
212 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
213 // Note: To find a method from name and type strings, use ciSymbol::make,
214 // but consider adding to vmSymbols.hpp instead.
216 bool is_leaf_type();
217 ciInstanceKlass* implementor();
219 // Is the defining class loader of this class the default loader?
220 bool uses_default_loader() const;
222 bool is_java_lang_Object() const;
224 BasicType box_klass_type() const;
225 bool is_box_klass() const;
226 bool is_boxed_value_offset(int offset) const;
228 // Is this klass in the given package?
229 bool is_in_package(const char* packagename) {
230 return is_in_package(packagename, (int) strlen(packagename));
231 }
232 bool is_in_package(const char* packagename, int len);
234 // What kind of ciObject is this?
235 bool is_instance_klass() const { return true; }
236 bool is_java_klass() const { return true; }
238 // Dump the current state of this klass for compilation replay.
239 virtual void dump_replay_data(outputStream* out);
240 };
242 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP