1 /* |
1 /* |
2 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * |
4 * |
5 * This code is free software; you can redistribute it and/or modify it |
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 |
6 * under the terms of the GNU General Public License version 2 only, as |
7 * published by the Free Software Foundation. |
7 * published by the Free Software Foundation. |
38 friend class VMStructs; |
38 friend class VMStructs; |
39 |
39 |
40 public: |
40 public: |
41 PlaceholderTable(int table_size); |
41 PlaceholderTable(int table_size); |
42 |
42 |
43 PlaceholderEntry* new_entry(int hash, Symbol* name, oop loader, bool havesupername, Symbol* supername); |
43 PlaceholderEntry* new_entry(int hash, Symbol* name, ClassLoaderData* loader_data, bool havesupername, Symbol* supername); |
44 void free_entry(PlaceholderEntry* entry); |
44 void free_entry(PlaceholderEntry* entry); |
45 |
45 |
46 PlaceholderEntry* bucket(int i) { |
46 PlaceholderEntry* bucket(int i) { |
47 return (PlaceholderEntry*)Hashtable<Symbol*, mtClass>::bucket(i); |
47 return (PlaceholderEntry*)Hashtable<Symbol*, mtClass>::bucket(i); |
48 } |
48 } |
54 void add_entry(int index, PlaceholderEntry* new_entry) { |
54 void add_entry(int index, PlaceholderEntry* new_entry) { |
55 Hashtable<Symbol*, mtClass>::add_entry(index, (HashtableEntry<Symbol*, mtClass>*)new_entry); |
55 Hashtable<Symbol*, mtClass>::add_entry(index, (HashtableEntry<Symbol*, mtClass>*)new_entry); |
56 } |
56 } |
57 |
57 |
58 void add_entry(int index, unsigned int hash, Symbol* name, |
58 void add_entry(int index, unsigned int hash, Symbol* name, |
59 Handle loader, bool havesupername, Symbol* supername); |
59 ClassLoaderData* loader_data, bool havesupername, Symbol* supername); |
60 |
60 |
61 // This returns a Symbol* to match type for SystemDictionary |
61 // This returns a Symbol* to match type for SystemDictionary |
62 Symbol* find_entry(int index, unsigned int hash, |
62 Symbol* find_entry(int index, unsigned int hash, |
63 Symbol* name, Handle loader); |
63 Symbol* name, ClassLoaderData* loader_data); |
64 |
64 |
65 PlaceholderEntry* get_entry(int index, unsigned int hash, |
65 PlaceholderEntry* get_entry(int index, unsigned int hash, |
66 Symbol* name, Handle loader); |
66 Symbol* name, ClassLoaderData* loader_data); |
67 |
67 |
68 // caller to create a placeholder entry must enumerate an action |
68 // caller to create a placeholder entry must enumerate an action |
69 // caller claims ownership of that action |
69 // caller claims ownership of that action |
70 // For parallel classloading: |
70 // For parallel classloading: |
71 // multiple LOAD_INSTANCE threads can proceed in parallel |
71 // multiple LOAD_INSTANCE threads can proceed in parallel |
83 |
83 |
84 // find_and_add returns probe pointer - old or new |
84 // find_and_add returns probe pointer - old or new |
85 // If no entry exists, add a placeholder entry and push SeenThread |
85 // If no entry exists, add a placeholder entry and push SeenThread |
86 // If entry exists, reuse entry and push SeenThread for classloadAction |
86 // If entry exists, reuse entry and push SeenThread for classloadAction |
87 PlaceholderEntry* find_and_add(int index, unsigned int hash, |
87 PlaceholderEntry* find_and_add(int index, unsigned int hash, |
88 Symbol* name, Handle loader, |
88 Symbol* name, ClassLoaderData* loader_data, |
89 classloadAction action, Symbol* supername, |
89 classloadAction action, Symbol* supername, |
90 Thread* thread); |
90 Thread* thread); |
91 |
91 |
92 void remove_entry(int index, unsigned int hash, |
92 void remove_entry(int index, unsigned int hash, |
93 Symbol* name, Handle loader); |
93 Symbol* name, ClassLoaderData* loader_data); |
94 |
94 |
95 // Remove placeholder information |
95 // Remove placeholder information |
96 void find_and_remove(int index, unsigned int hash, |
96 void find_and_remove(int index, unsigned int hash, |
97 Symbol* name, Handle loader, Thread* thread); |
97 Symbol* name, ClassLoaderData* loader_data, Thread* thread); |
98 |
98 |
99 // GC support. |
99 // GC support. |
100 void oops_do(OopClosure* f); |
100 void classes_do(KlassClosure* f); |
101 |
101 |
102 // JVMTI support |
102 // JVMTI support |
103 void entries_do(void f(Symbol*, oop)); |
103 void entries_do(void f(Symbol*)); |
104 |
104 |
105 #ifndef PRODUCT |
105 #ifndef PRODUCT |
106 void print(); |
106 void print(); |
107 #endif |
107 #endif |
108 void verify(); |
108 void verify(); |
155 class PlaceholderEntry : public HashtableEntry<Symbol*, mtClass> { |
155 class PlaceholderEntry : public HashtableEntry<Symbol*, mtClass> { |
156 friend class VMStructs; |
156 friend class VMStructs; |
157 |
157 |
158 |
158 |
159 private: |
159 private: |
160 oop _loader; // initiating loader |
160 ClassLoaderData* _loader_data; // initiating loader |
161 bool _havesupername; // distinguish between null supername, and unknown |
161 bool _havesupername; // distinguish between null supername, and unknown |
162 Symbol* _supername; |
162 Symbol* _supername; |
163 Thread* _definer; // owner of define token |
163 Thread* _definer; // owner of define token |
164 klassOop _instanceKlass; // instanceKlass from successful define |
164 Klass* _instanceKlass; // InstanceKlass from successful define |
165 SeenThread* _superThreadQ; // doubly-linked queue of Threads loading a superclass for this class |
165 SeenThread* _superThreadQ; // doubly-linked queue of Threads loading a superclass for this class |
166 SeenThread* _loadInstanceThreadQ; // loadInstance thread |
166 SeenThread* _loadInstanceThreadQ; // loadInstance thread |
167 // can be multiple threads if classloader object lock broken by application |
167 // can be multiple threads if classloader object lock broken by application |
168 // or if classloader supports parallel classloading |
168 // or if classloader supports parallel classloading |
169 |
169 |
174 |
174 |
175 public: |
175 public: |
176 // Simple accessors, used only by SystemDictionary |
176 // Simple accessors, used only by SystemDictionary |
177 Symbol* klassname() const { return literal(); } |
177 Symbol* klassname() const { return literal(); } |
178 |
178 |
179 oop loader() const { return _loader; } |
179 ClassLoaderData* loader_data() const { return _loader_data; } |
180 void set_loader(oop loader) { _loader = loader; } |
180 void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } |
181 oop* loader_addr() { return &_loader; } |
|
182 |
181 |
183 bool havesupername() const { return _havesupername; } |
182 bool havesupername() const { return _havesupername; } |
184 void set_havesupername(bool havesupername) { _havesupername = havesupername; } |
183 void set_havesupername(bool havesupername) { _havesupername = havesupername; } |
185 |
184 |
186 Symbol* supername() const { return _supername; } |
185 Symbol* supername() const { return _supername; } |
190 } |
189 } |
191 |
190 |
192 Thread* definer() const {return _definer; } |
191 Thread* definer() const {return _definer; } |
193 void set_definer(Thread* definer) { _definer = definer; } |
192 void set_definer(Thread* definer) { _definer = definer; } |
194 |
193 |
195 klassOop instanceKlass() const {return _instanceKlass; } |
194 Klass* InstanceKlass() const {return _instanceKlass; } |
196 void set_instanceKlass(klassOop instanceKlass) { _instanceKlass = instanceKlass; } |
195 void set_instanceKlass(Klass* InstanceKlass) { _instanceKlass = InstanceKlass; } |
197 klassOop* instanceKlass_addr() { return &_instanceKlass; } |
|
198 |
196 |
199 SeenThread* superThreadQ() const { return _superThreadQ; } |
197 SeenThread* superThreadQ() const { return _superThreadQ; } |
200 void set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; } |
198 void set_superThreadQ(SeenThread* SeenThread) { _superThreadQ = SeenThread; } |
201 |
199 |
202 SeenThread* loadInstanceThreadQ() const { return _loadInstanceThreadQ; } |
200 SeenThread* loadInstanceThreadQ() const { return _loadInstanceThreadQ; } |
213 return (PlaceholderEntry**)HashtableEntry<Symbol*, mtClass>::next_addr(); |
211 return (PlaceholderEntry**)HashtableEntry<Symbol*, mtClass>::next_addr(); |
214 } |
212 } |
215 |
213 |
216 // Test for equality |
214 // Test for equality |
217 // Entries are unique for class/classloader name pair |
215 // Entries are unique for class/classloader name pair |
218 bool equals(Symbol* class_name, oop class_loader) const { |
216 bool equals(Symbol* class_name, ClassLoaderData* loader) const { |
219 return (klassname() == class_name && loader() == class_loader); |
217 return (klassname() == class_name && loader_data() == loader); |
220 } |
218 } |
221 |
219 |
222 SeenThread* actionToQueue(PlaceholderTable::classloadAction action) { |
220 SeenThread* actionToQueue(PlaceholderTable::classloadAction action) { |
223 SeenThread* queuehead; |
221 SeenThread* queuehead; |
224 switch (action) { |
222 switch (action) { |
329 return (actionToQueue(action) == NULL); |
327 return (actionToQueue(action) == NULL); |
330 } |
328 } |
331 |
329 |
332 // GC support |
330 // GC support |
333 // Applies "f->do_oop" to all root oops in the placeholder table. |
331 // Applies "f->do_oop" to all root oops in the placeholder table. |
334 void oops_do(OopClosure* blk); |
332 void classes_do(KlassClosure* closure); |
335 |
333 |
336 // Print method doesn't append a cr |
334 // Print method doesn't append a cr |
337 void print() const PRODUCT_RETURN; |
335 void print() const PRODUCT_RETURN; |
338 void verify() const; |
336 void verify() const; |
339 }; |
337 }; |