jdk8-mips64-public/hotspot: src/share/vm/classfile/dictionary.hpp@ede380e13960

8009763: Add WB test for String.intern()
Summary: Add convenience method in StringTable, add WhiteBox method and simple sanity test
Reviewed-by: mgerdin, zgu
Contributed-by: leonid.mesnik@oracle.com

     1 /*

     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.

     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  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP

    26 #define SHARE_VM_CLASSFILE_DICTIONARY_HPP

    28 #include "classfile/systemDictionary.hpp"

    29 #include "oops/instanceKlass.hpp"

    30 #include "oops/oop.hpp"

    31 #include "utilities/hashtable.hpp"

    33 class DictionaryEntry;

    34 class PSPromotionManager;

    36 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    37 // The data structure for the system dictionary (and the shared system

    38 // dictionary).

    40 class Dictionary : public TwoOopHashtable<Klass*, mtClass> {

    41   friend class VMStructs;

    42 private:

    43   // current iteration index.

    44   static int                    _current_class_index;

    45   // pointer to the current hash table entry.

    46   static DictionaryEntry*       _current_class_entry;

    48   DictionaryEntry* get_entry(int index, unsigned int hash,

    49                              Symbol* name, ClassLoaderData* loader_data);

    51   DictionaryEntry* bucket(int i) {

    52     return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i);

    53   }

    55   // The following method is not MT-safe and must be done under lock.

    56   DictionaryEntry** bucket_addr(int i) {

    57     return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i);

    58   }

    60   void add_entry(int index, DictionaryEntry* new_entry) {

    61     Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry);

    62   }

    64 public:

    65   Dictionary(int table_size);

    66   Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries);

    68   DictionaryEntry* new_entry(unsigned int hash, Klass* klass, ClassLoaderData* loader_data);

    70   DictionaryEntry* new_entry();

    72   void free_entry(DictionaryEntry* entry);

    74   void add_klass(Symbol* class_name, ClassLoaderData* loader_data,KlassHandle obj);

    76   Klass* find_class(int index, unsigned int hash,

    77                       Symbol* name, ClassLoaderData* loader_data);

    79   Klass* find_shared_class(int index, unsigned int hash, Symbol* name);

    81   // Compiler support

    82   Klass* try_get_next_class();

    84   // GC support

    85   void oops_do(OopClosure* f);

    86   void always_strong_oops_do(OopClosure* blk);

    88   void always_strong_classes_do(KlassClosure* closure);

    90   void classes_do(void f(Klass*));

    91   void classes_do(void f(Klass*, TRAPS), TRAPS);

    92   void classes_do(void f(Klass*, ClassLoaderData*));

    93   void classes_do(void f(Klass*, ClassLoaderData*, TRAPS), TRAPS);

    95   void methods_do(void f(Method*));

    98   // Classes loaded by the bootstrap loader are always strongly reachable.

    99   // If we're not doing class unloading, all classes are strongly reachable.

   100   static bool is_strongly_reachable(ClassLoaderData* loader_data, Klass* klass) {

   101     assert (klass != NULL, "should have non-null klass");

   102     return (loader_data->is_the_null_class_loader_data() || !ClassUnloading);

   103   }

   105   // Unload (that is, break root links to) all unmarked classes and

   106   // loaders.  Returns "true" iff something was unloaded.

   107   bool do_unloading();

   109   // Protection domains

   110   Klass* find(int index, unsigned int hash, Symbol* name,

   111                 ClassLoaderData* loader_data, Handle protection_domain, TRAPS);

   112   bool is_valid_protection_domain(int index, unsigned int hash,

   113                                   Symbol* name, ClassLoaderData* loader_data,

   114                                   Handle protection_domain);

   115   void add_protection_domain(int index, unsigned int hash,

   116                              instanceKlassHandle klass, ClassLoaderData* loader_data,

   117                              Handle protection_domain, TRAPS);

   119   // Sharing support

   120   void reorder_dictionary();

   123 #ifndef PRODUCT

   124   void print();

   125 #endif

   126   void verify();

   127 };

   129 // The following classes can be in dictionary.cpp, but we need these

   130 // to be in header file so that SA's vmStructs can access.

   132 class ProtectionDomainEntry :public CHeapObj<mtClass> {

   133   friend class VMStructs;

   134  public:

   135   ProtectionDomainEntry* _next;

   136   oop                    _protection_domain;

   138   ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) {

   139     _protection_domain = protection_domain;

   140     _next              = next;

   141   }

   143   ProtectionDomainEntry* next() { return _next; }

   144   oop protection_domain() { return _protection_domain; }

   145 };

   147 // An entry in the system dictionary, this describes a class as

   148 // { Klass*, loader, protection_domain }.

   150 class DictionaryEntry : public HashtableEntry<Klass*, mtClass> {

   151   friend class VMStructs;

   152  private:

   153   // Contains the set of approved protection domains that can access

   154   // this system dictionary entry.

   155   ProtectionDomainEntry* _pd_set;

   156   ClassLoaderData*       _loader_data;

   158  public:

   159   // Tells whether a protection is in the approved set.

   160   bool contains_protection_domain(oop protection_domain) const;

   161   // Adds a protection domain to the approved set.

   162   void add_protection_domain(oop protection_domain);

   164   Klass* klass() const { return (Klass*)literal(); }

   165   Klass** klass_addr() { return (Klass**)literal_addr(); }

   167   DictionaryEntry* next() const {

   168     return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next();

   169   }

   171   DictionaryEntry** next_addr() {

   172     return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr();

   173   }

   175   ClassLoaderData* loader_data() const { return _loader_data; }

   176   void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; }

   178   ProtectionDomainEntry* pd_set() const { return _pd_set; }

   179   void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; }

   181   bool has_protection_domain() { return _pd_set != NULL; }

   183   // Tells whether the initiating class' protection can access the this _klass

   184   bool is_valid_protection_domain(Handle protection_domain) {

   185     if (!ProtectionDomainVerification) return true;

   186     if (!SystemDictionary::has_checkPackageAccess()) return true;

   188     return protection_domain() == NULL

   189          ? true

   190          : contains_protection_domain(protection_domain());

   191   }

   194   void protection_domain_set_oops_do(OopClosure* f) {

   195     for (ProtectionDomainEntry* current = _pd_set;

   196                                 current != NULL;

   197                                 current = current->_next) {

   198       f->do_oop(&(current->_protection_domain));

   199     }

   200   }

   202   void verify_protection_domain_set() {

   203     for (ProtectionDomainEntry* current = _pd_set;

   204                                 current != NULL;

   205                                 current = current->_next) {

   206       current->_protection_domain->verify();

   207     }

   208   }

   210   bool equals(Symbol* class_name, ClassLoaderData* loader_data) const {

   211     Klass* klass = (Klass*)literal();

   212     return (InstanceKlass::cast(klass)->name() == class_name &&

   213             _loader_data == loader_data);

   214   }

   216   void print() {

   217     int count = 0;

   218     for (ProtectionDomainEntry* current = _pd_set;

   219                                 current != NULL;

   220                                 current = current->_next) {

   221       count++;

   222     }

   223     tty->print_cr("pd set = #%d", count);

   224   }

   225 };

   227 // Entry in a SymbolPropertyTable, mapping a single Symbol*

   228 // to a managed and an unmanaged pointer.

   229 class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> {

   230   friend class VMStructs;

   231  private:

   232   intptr_t _symbol_mode;  // secondary key

   233   Method*   _method;

   234   oop       _method_type;

   236  public:

   237   Symbol* symbol() const            { return literal(); }

   239   intptr_t symbol_mode() const      { return _symbol_mode; }

   240   void set_symbol_mode(intptr_t m)  { _symbol_mode = m; }

   242   Method*        method() const     { return _method; }

   243   void set_method(Method* p)        { _method = p; }

   245   oop      method_type() const      { return _method_type; }

   246   oop*     method_type_addr()       { return &_method_type; }

   247   void set_method_type(oop p)       { _method_type = p; }

   249   SymbolPropertyEntry* next() const {

   250     return (SymbolPropertyEntry*)HashtableEntry<Symbol*, mtSymbol>::next();

   251   }

   253   SymbolPropertyEntry** next_addr() {

   254     return (SymbolPropertyEntry**)HashtableEntry<Symbol*, mtSymbol>::next_addr();

   255   }

   257   void print_on(outputStream* st) const {

   258     symbol()->print_value_on(st);

   259     st->print("/mode="INTX_FORMAT, symbol_mode());

   260     st->print(" -> ");

   261     bool printed = false;

   262     if (method() != NULL) {

   263       method()->print_value_on(st);

   264       printed = true;

   265     }

   266     if (method_type() != NULL) {

   267       if (printed)  st->print(" and ");

   268       st->print(INTPTR_FORMAT, method_type());

   269       printed = true;

   270     }

   271     st->print_cr(printed ? "" : "(empty)");

   272   }

   273 };

   275 // A system-internal mapping of symbols to pointers, both managed

   276 // and unmanaged.  Used to record the auto-generation of each method

   277 // MethodHandle.invoke(S)T, for all signatures (S)T.

   278 class SymbolPropertyTable : public Hashtable<Symbol*, mtSymbol> {

   279   friend class VMStructs;

   280 private:

   281   SymbolPropertyEntry* bucket(int i) {

   282     return (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::bucket(i);

   283   }

   285   // The following method is not MT-safe and must be done under lock.

   286   SymbolPropertyEntry** bucket_addr(int i) {

   287     return (SymbolPropertyEntry**) Hashtable<Symbol*, mtSymbol>::bucket_addr(i);

   288   }

   290   void add_entry(int index, SymbolPropertyEntry* new_entry) {

   291     ShouldNotReachHere();

   292   }

   293   void set_entry(int index, SymbolPropertyEntry* new_entry) {

   294     ShouldNotReachHere();

   295   }

   297   SymbolPropertyEntry* new_entry(unsigned int hash, Symbol* symbol, intptr_t symbol_mode) {

   298     SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::new_entry(hash, symbol);

   299     // Hashtable with Symbol* literal must increment and decrement refcount.

   300     symbol->increment_refcount();

   301     entry->set_symbol_mode(symbol_mode);

   302     entry->set_method(NULL);

   303     entry->set_method_type(NULL);

   304     return entry;

   305   }

   307 public:

   308   SymbolPropertyTable(int table_size);

   309   SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t, int number_of_entries);

   311   void free_entry(SymbolPropertyEntry* entry) {

   312     // decrement Symbol refcount here because hashtable doesn't.

   313     entry->literal()->decrement_refcount();

   314     Hashtable<Symbol*, mtSymbol>::free_entry(entry);

   315   }

   317   unsigned int compute_hash(Symbol* sym, intptr_t symbol_mode) {

   318     // Use the regular identity_hash.

   319     return Hashtable<Symbol*, mtSymbol>::compute_hash(sym) ^ symbol_mode;

   320   }

   322   int index_for(Symbol* name, intptr_t symbol_mode) {

   323     return hash_to_index(compute_hash(name, symbol_mode));

   324   }

   326   // need not be locked; no state change

   327   SymbolPropertyEntry* find_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode);

   329   // must be done under SystemDictionary_lock

   330   SymbolPropertyEntry* add_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode);

   332   // GC support

   333   void oops_do(OopClosure* f);

   335   void methods_do(void f(Method*));

   337   // Sharing support

   338   void reorder_dictionary();

   340 #ifndef PRODUCT

   341   void print();

   342 #endif

   343   void verify();

   344 };

   345 #endif // SHARE_VM_CLASSFILE_DICTIONARY_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/classfile/dictionary.hpp@ede380e13960

src/share/vm/classfile/dictionary.hpp