Mercurial > hg > truffle
view src/share/vm/classfile/dictionary.hpp @ 1930:2d26b0046e0d
Merge.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Tue, 30 Nov 2010 14:53:30 +0100 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ class DictionaryEntry; //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // The data structure for the system dictionary (and the shared system // dictionary). class Dictionary : public TwoOopHashtable { friend class VMStructs; private: // current iteration index. static int _current_class_index; // pointer to the current hash table entry. static DictionaryEntry* _current_class_entry; DictionaryEntry* get_entry(int index, unsigned int hash, symbolHandle name, Handle loader); DictionaryEntry* bucket(int i) { return (DictionaryEntry*)Hashtable::bucket(i); } // The following method is not MT-safe and must be done under lock. DictionaryEntry** bucket_addr(int i) { return (DictionaryEntry**)Hashtable::bucket_addr(i); } void add_entry(int index, DictionaryEntry* new_entry) { Hashtable::add_entry(index, (HashtableEntry*)new_entry); } public: Dictionary(int table_size); Dictionary(int table_size, HashtableBucket* t, int number_of_entries); DictionaryEntry* new_entry(unsigned int hash, klassOop klass, oop loader); DictionaryEntry* new_entry(); void free_entry(DictionaryEntry* entry); void add_klass(symbolHandle class_name, Handle class_loader,KlassHandle obj); klassOop find_class(int index, unsigned int hash, symbolHandle name, Handle loader); klassOop find_shared_class(int index, unsigned int hash, symbolHandle name); // Compiler support klassOop try_get_next_class(); // GC support void oops_do(OopClosure* f); void always_strong_classes_do(OopClosure* blk); void classes_do(void f(klassOop)); void classes_do(void f(klassOop, TRAPS), TRAPS); void classes_do(void f(klassOop, oop)); void classes_do(void f(klassOop, oop, TRAPS), TRAPS); void methods_do(void f(methodOop)); // Classes loaded by the bootstrap loader are always strongly reachable. // If we're not doing class unloading, all classes are strongly reachable. static bool is_strongly_reachable(oop class_loader, oop klass) { assert (klass != NULL, "should have non-null klass"); return (class_loader == NULL || !ClassUnloading); } // Unload (that is, break root links to) all unmarked classes and // loaders. Returns "true" iff something was unloaded. bool do_unloading(BoolObjectClosure* is_alive); // Protection domains klassOop find(int index, unsigned int hash, symbolHandle name, Handle loader, Handle protection_domain, TRAPS); bool is_valid_protection_domain(int index, unsigned int hash, symbolHandle name, Handle class_loader, Handle protection_domain); void add_protection_domain(int index, unsigned int hash, instanceKlassHandle klass, Handle loader, Handle protection_domain, TRAPS); // Sharing support void dump(SerializeOopClosure* soc); void restore(SerializeOopClosure* soc); void reorder_dictionary(); #ifndef PRODUCT void print(); #endif void verify(); }; // The following classes can be in dictionary.cpp, but we need these // to be in header file so that SA's vmStructs can access. class ProtectionDomainEntry :public CHeapObj { friend class VMStructs; public: ProtectionDomainEntry* _next; oop _protection_domain; ProtectionDomainEntry(oop protection_domain, ProtectionDomainEntry* next) { _protection_domain = protection_domain; _next = next; } ProtectionDomainEntry* next() { return _next; } oop protection_domain() { return _protection_domain; } }; // An entry in the system dictionary, this describes a class as // { klassOop, loader, protection_domain }. class DictionaryEntry : public HashtableEntry { friend class VMStructs; private: // Contains the set of approved protection domains that can access // this system dictionary entry. ProtectionDomainEntry* _pd_set; oop _loader; public: // Tells whether a protection is in the approved set. bool contains_protection_domain(oop protection_domain) const; // Adds a protection domain to the approved set. void add_protection_domain(oop protection_domain); klassOop klass() const { return (klassOop)literal(); } klassOop* klass_addr() { return (klassOop*)literal_addr(); } DictionaryEntry* next() const { return (DictionaryEntry*)HashtableEntry::next(); } DictionaryEntry** next_addr() { return (DictionaryEntry**)HashtableEntry::next_addr(); } oop loader() const { return _loader; } void set_loader(oop loader) { _loader = loader; } oop* loader_addr() { return &_loader; } ProtectionDomainEntry* pd_set() const { return _pd_set; } void set_pd_set(ProtectionDomainEntry* pd_set) { _pd_set = pd_set; } bool has_protection_domain() { return _pd_set != NULL; } // Tells whether the initiating class' protection can access the this _klass bool is_valid_protection_domain(Handle protection_domain) { if (!ProtectionDomainVerification) return true; if (!SystemDictionary::has_checkPackageAccess()) return true; return protection_domain() == NULL ? true : contains_protection_domain(protection_domain()); } void protection_domain_set_oops_do(OopClosure* f) { for (ProtectionDomainEntry* current = _pd_set; current != NULL; current = current->_next) { f->do_oop(&(current->_protection_domain)); } } void verify_protection_domain_set() { for (ProtectionDomainEntry* current = _pd_set; current != NULL; current = current->_next) { current->_protection_domain->verify(); } } bool equals(symbolOop class_name, oop class_loader) const { klassOop klass = (klassOop)literal(); return (instanceKlass::cast(klass)->name() == class_name && _loader == class_loader); } void print() { int count = 0; for (ProtectionDomainEntry* current = _pd_set; current != NULL; current = current->_next) { count++; } tty->print_cr("pd set = #%d", count); } }; // Entry in a SymbolPropertyTable, mapping a single symbolOop // to a managed and an unmanaged pointer. class SymbolPropertyEntry : public HashtableEntry { friend class VMStructs; private: intptr_t _symbol_mode; // secondary key oop _property_oop; address _property_data; public: symbolOop symbol() const { return (symbolOop) literal(); } intptr_t symbol_mode() const { return _symbol_mode; } void set_symbol_mode(intptr_t m) { _symbol_mode = m; } oop property_oop() const { return _property_oop; } void set_property_oop(oop p) { _property_oop = p; } address property_data() const { return _property_data; } void set_property_data(address p) { _property_data = p; } SymbolPropertyEntry* next() const { return (SymbolPropertyEntry*)HashtableEntry::next(); } SymbolPropertyEntry** next_addr() { return (SymbolPropertyEntry**)HashtableEntry::next_addr(); } oop* symbol_addr() { return literal_addr(); } oop* property_oop_addr() { return &_property_oop; } void print_on(outputStream* st) const { symbol()->print_value_on(st); st->print("/mode="INTX_FORMAT, symbol_mode()); st->print(" -> "); bool printed = false; if (property_oop() != NULL) { property_oop()->print_value_on(st); printed = true; } if (property_data() != NULL) { if (printed) st->print(" and "); st->print(INTPTR_FORMAT, property_data()); printed = true; } st->print_cr(printed ? "" : "(empty)"); } }; // A system-internal mapping of symbols to pointers, both managed // and unmanaged. Used to record the auto-generation of each method // MethodHandle.invoke(S)T, for all signatures (S)T. class SymbolPropertyTable : public Hashtable { friend class VMStructs; private: SymbolPropertyEntry* bucket(int i) { return (SymbolPropertyEntry*) Hashtable::bucket(i); } // The following method is not MT-safe and must be done under lock. SymbolPropertyEntry** bucket_addr(int i) { return (SymbolPropertyEntry**) Hashtable::bucket_addr(i); } void add_entry(int index, SymbolPropertyEntry* new_entry) { ShouldNotReachHere(); } void set_entry(int index, SymbolPropertyEntry* new_entry) { ShouldNotReachHere(); } SymbolPropertyEntry* new_entry(unsigned int hash, symbolOop symbol, intptr_t symbol_mode) { SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable::new_entry(hash, symbol); entry->set_symbol_mode(symbol_mode); entry->set_property_oop(NULL); entry->set_property_data(NULL); return entry; } public: SymbolPropertyTable(int table_size); SymbolPropertyTable(int table_size, HashtableBucket* t, int number_of_entries); void free_entry(SymbolPropertyEntry* entry) { Hashtable::free_entry(entry); } unsigned int compute_hash(symbolHandle sym, intptr_t symbol_mode) { // Use the regular identity_hash. return Hashtable::compute_hash(sym) ^ symbol_mode; } int index_for(symbolHandle name, intptr_t symbol_mode) { return hash_to_index(compute_hash(name, symbol_mode)); } // need not be locked; no state change SymbolPropertyEntry* find_entry(int index, unsigned int hash, symbolHandle name, intptr_t name_mode); // must be done under SystemDictionary_lock SymbolPropertyEntry* add_entry(int index, unsigned int hash, symbolHandle name, intptr_t name_mode); // GC support void oops_do(OopClosure* f); void methods_do(void f(methodOop)); // Sharing support void dump(SerializeOopClosure* soc); void restore(SerializeOopClosure* soc); void reorder_dictionary(); #ifndef PRODUCT void print(); #endif void verify(); };