Thu, 29 Mar 2012 22:18:56 -0400
7154670: The instanceKlass _implementors[] and _nof_implementors are not needed for non-interface klass.
Summary: Change implementor to embedded instanceKlass field.
Reviewed-by: sspitsyn, minqi, coleenp
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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).
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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/ciInstanceKlassKlass.hpp"
31 #include "ci/ciKlass.hpp"
32 #include "ci/ciSymbol.hpp"
34 // ciInstanceKlass
35 //
36 // This class represents a klassOop in the HotSpot virtual machine
37 // whose Klass part is an instanceKlass. It may or may not
38 // be loaded.
39 class ciInstanceKlass : public ciKlass {
40 CI_PACKAGE_ACCESS
41 friend class ciBytecodeStream;
42 friend class ciEnv;
43 friend class ciExceptionHandler;
44 friend class ciMethod;
45 friend class ciField;
47 private:
48 jobject _loader;
49 jobject _protection_domain;
51 instanceKlass::ClassState _init_state; // state of class
52 bool _is_shared;
53 bool _has_finalizer;
54 bool _has_subklass;
55 bool _has_nonstatic_fields;
57 ciFlags _flags;
58 jint _nonstatic_field_size;
59 jint _nonstatic_oop_map_size;
61 // Lazy fields get filled in only upon request.
62 ciInstanceKlass* _super;
63 ciInstance* _java_mirror;
65 ciConstantPoolCache* _field_cache; // cached map index->field
66 GrowableArray<ciField*>* _nonstatic_fields;
68 // The possible values of the _implementor fall into following three cases:
69 // NULL: no implementor.
70 // A ciInstanceKlass that's not itself: one implementor.
71 // Itsef: more than one implementors.
72 ciInstanceKlass* _implementor;
74 GrowableArray<ciField*>* _non_static_fields;
76 protected:
77 ciInstanceKlass(KlassHandle h_k);
78 ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);
80 instanceKlass* get_instanceKlass() const {
81 return (instanceKlass*)get_Klass();
82 }
84 oop loader();
85 jobject loader_handle();
87 oop protection_domain();
88 jobject protection_domain_handle();
90 const char* type_string() { return "ciInstanceKlass"; }
92 bool is_in_package_impl(const char* packagename, int len);
94 void print_impl(outputStream* st);
96 ciConstantPoolCache* field_cache();
98 bool is_shared() { return _is_shared; }
100 void compute_shared_init_state();
101 bool compute_shared_has_subklass();
102 int compute_nonstatic_fields();
103 GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);
105 // Update the init_state for shared klasses
106 void update_if_shared(instanceKlass::ClassState expected) {
107 if (_is_shared && _init_state != expected) {
108 if (is_loaded()) compute_shared_init_state();
109 }
110 }
112 public:
113 // Has this klass been initialized?
114 bool is_initialized() {
115 update_if_shared(instanceKlass::fully_initialized);
116 return _init_state == instanceKlass::fully_initialized;
117 }
118 // Is this klass being initialized?
119 bool is_being_initialized() {
120 update_if_shared(instanceKlass::being_initialized);
121 return _init_state == instanceKlass::being_initialized;
122 }
123 // Has this klass been linked?
124 bool is_linked() {
125 update_if_shared(instanceKlass::linked);
126 return _init_state >= instanceKlass::linked;
127 }
129 // General klass information.
130 ciFlags flags() {
131 assert(is_loaded(), "must be loaded");
132 return _flags;
133 }
134 bool has_finalizer() {
135 assert(is_loaded(), "must be loaded");
136 return _has_finalizer; }
137 bool has_subklass() {
138 assert(is_loaded(), "must be loaded");
139 if (_is_shared && !_has_subklass) {
140 if (flags().is_final()) {
141 return false;
142 } else {
143 return compute_shared_has_subklass();
144 }
145 }
146 return _has_subklass;
147 }
148 jint size_helper() {
149 return (Klass::layout_helper_size_in_bytes(layout_helper())
150 >> LogHeapWordSize);
151 }
152 jint nonstatic_field_size() {
153 assert(is_loaded(), "must be loaded");
154 return _nonstatic_field_size; }
155 jint has_nonstatic_fields() {
156 assert(is_loaded(), "must be loaded");
157 return _has_nonstatic_fields; }
158 jint nonstatic_oop_map_size() {
159 assert(is_loaded(), "must be loaded");
160 return _nonstatic_oop_map_size; }
161 ciInstanceKlass* super();
162 jint nof_implementors() {
163 ciInstanceKlass* impl;
164 assert(is_loaded(), "must be loaded");
165 impl = implementor();
166 if (impl == NULL) {
167 return 0;
168 } else if (impl != this) {
169 return 1;
170 } else {
171 return 2;
172 }
173 }
175 ciInstanceKlass* get_canonical_holder(int offset);
176 ciField* get_field_by_offset(int field_offset, bool is_static);
177 ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);
179 GrowableArray<ciField*>* non_static_fields();
181 // total number of nonstatic fields (including inherited):
182 int nof_nonstatic_fields() {
183 if (_nonstatic_fields == NULL)
184 return compute_nonstatic_fields();
185 else
186 return _nonstatic_fields->length();
187 }
188 // nth nonstatic field (presented by ascending address)
189 ciField* nonstatic_field_at(int i) {
190 assert(_nonstatic_fields != NULL, "");
191 return _nonstatic_fields->at(i);
192 }
194 ciInstanceKlass* unique_concrete_subklass();
195 bool has_finalizable_subclass();
197 bool contains_field_offset(int offset) {
198 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
199 }
201 // Get the instance of java.lang.Class corresponding to
202 // this klass. This instance is used for locking of
203 // synchronized static methods of this klass.
204 ciInstance* java_mirror();
206 // Java access flags
207 bool is_public () { return flags().is_public(); }
208 bool is_final () { return flags().is_final(); }
209 bool is_super () { return flags().is_super(); }
210 bool is_interface () { return flags().is_interface(); }
211 bool is_abstract () { return flags().is_abstract(); }
213 ciMethod* find_method(ciSymbol* name, ciSymbol* signature);
214 // Note: To find a method from name and type strings, use ciSymbol::make,
215 // but consider adding to vmSymbols.hpp instead.
217 bool is_leaf_type();
218 ciInstanceKlass* implementor();
220 // Is the defining class loader of this class the default loader?
221 bool uses_default_loader();
223 bool is_java_lang_Object();
225 // Is this klass in the given package?
226 bool is_in_package(const char* packagename) {
227 return is_in_package(packagename, (int) strlen(packagename));
228 }
229 bool is_in_package(const char* packagename, int len);
231 // What kind of ciObject is this?
232 bool is_instance_klass() { return true; }
233 bool is_java_klass() { return true; }
234 };
236 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP