Mercurial > hg > truffle
view src/share/vm/classfile/dictionary.hpp @ 18164:53afdc71b311
Truffle: added PrimitiveValueProfile.
author | Chris Seaton <chris.seaton@oracle.com> |
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date | Fri, 24 Oct 2014 22:50:04 +0100 |
parents | 78bbf4d43a14 |
children | 2c6ef90f030a |
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/* * Copyright (c) 2003, 2014, 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. * */ #ifndef SHARE_VM_CLASSFILE_DICTIONARY_HPP #define SHARE_VM_CLASSFILE_DICTIONARY_HPP #include "classfile/systemDictionary.hpp" #include "oops/instanceKlass.hpp" #include "oops/oop.inline.hpp" #include "utilities/hashtable.hpp" class DictionaryEntry; class PSPromotionManager; class ProtectionDomainCacheTable; class ProtectionDomainCacheEntry; class BoolObjectClosure; //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // The data structure for the system dictionary (and the shared system // dictionary). class Dictionary : public TwoOopHashtable<Klass*, mtClass> { friend class VMStructs; private: // current iteration index. static int _current_class_index; // pointer to the current hash table entry. static DictionaryEntry* _current_class_entry; ProtectionDomainCacheTable* _pd_cache_table; DictionaryEntry* get_entry(int index, unsigned int hash, Symbol* name, ClassLoaderData* loader_data); DictionaryEntry* bucket(int i) { return (DictionaryEntry*)Hashtable<Klass*, mtClass>::bucket(i); } // The following method is not MT-safe and must be done under lock. DictionaryEntry** bucket_addr(int i) { return (DictionaryEntry**)Hashtable<Klass*, mtClass>::bucket_addr(i); } void add_entry(int index, DictionaryEntry* new_entry) { Hashtable<Klass*, mtClass>::add_entry(index, (HashtableEntry<Klass*, mtClass>*)new_entry); } public: Dictionary(int table_size); Dictionary(int table_size, HashtableBucket<mtClass>* t, int number_of_entries); DictionaryEntry* new_entry(unsigned int hash, Klass* klass, ClassLoaderData* loader_data); DictionaryEntry* new_entry(); void free_entry(DictionaryEntry* entry); void add_klass(Symbol* class_name, ClassLoaderData* loader_data,KlassHandle obj); Klass* find_class(int index, unsigned int hash, Symbol* name, ClassLoaderData* loader_data); Klass* find_shared_class(int index, unsigned int hash, Symbol* name); // Compiler support Klass* try_get_next_class(); // GC support void oops_do(OopClosure* f); void always_strong_oops_do(OopClosure* blk); void always_strong_classes_do(KlassClosure* closure); void classes_do(void f(Klass*)); void classes_do(void f(Klass*, TRAPS), TRAPS); void classes_do(void f(Klass*, ClassLoaderData*)); void methods_do(void f(Method*)); void unlink(BoolObjectClosure* is_alive); // 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(ClassLoaderData* loader_data, Klass* klass) { assert (klass != NULL, "should have non-null klass"); return (loader_data->is_the_null_class_loader_data() || !ClassUnloading); } // Unload (that is, break root links to) all unmarked classes and // loaders. Returns "true" iff something was unloaded. bool do_unloading(); // Protection domains Klass* find(int index, unsigned int hash, Symbol* name, ClassLoaderData* loader_data, Handle protection_domain, TRAPS); bool is_valid_protection_domain(int index, unsigned int hash, Symbol* name, ClassLoaderData* loader_data, Handle protection_domain); void add_protection_domain(int index, unsigned int hash, instanceKlassHandle klass, ClassLoaderData* loader_data, Handle protection_domain, TRAPS); // Sharing support void reorder_dictionary(); ProtectionDomainCacheEntry* cache_get(oop protection_domain); #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 them. class ProtectionDomainCacheEntry : public HashtableEntry<oop, mtClass> { friend class VMStructs; private: // Flag indicating whether this protection domain entry is strongly reachable. // Used during iterating over the system dictionary to remember oops that need // to be updated. bool _strongly_reachable; public: oop protection_domain() { return literal(); } void init() { _strongly_reachable = false; } ProtectionDomainCacheEntry* next() { return (ProtectionDomainCacheEntry*)HashtableEntry<oop, mtClass>::next(); } ProtectionDomainCacheEntry** next_addr() { return (ProtectionDomainCacheEntry**)HashtableEntry<oop, mtClass>::next_addr(); } void oops_do(OopClosure* f) { f->do_oop(literal_addr()); } void set_strongly_reachable() { _strongly_reachable = true; } bool is_strongly_reachable() { return _strongly_reachable; } void reset_strongly_reachable() { _strongly_reachable = false; } void print() PRODUCT_RETURN; void verify(); }; // The ProtectionDomainCacheTable contains all protection domain oops. The system // dictionary entries reference its entries instead of having references to oops // directly. // This is used to speed up system dictionary iteration: the oops in the // protection domain are the only ones referring the Java heap. So when there is // need to update these, instead of going over every entry of the system dictionary, // we only need to iterate over this set. // The amount of different protection domains used is typically magnitudes smaller // than the number of system dictionary entries (loaded classes). class ProtectionDomainCacheTable : public Hashtable<oop, mtClass> { friend class VMStructs; private: ProtectionDomainCacheEntry* bucket(int i) { return (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::bucket(i); } // The following method is not MT-safe and must be done under lock. ProtectionDomainCacheEntry** bucket_addr(int i) { return (ProtectionDomainCacheEntry**) Hashtable<oop, mtClass>::bucket_addr(i); } ProtectionDomainCacheEntry* new_entry(unsigned int hash, oop protection_domain) { ProtectionDomainCacheEntry* entry = (ProtectionDomainCacheEntry*) Hashtable<oop, mtClass>::new_entry(hash, protection_domain); entry->init(); return entry; } static unsigned int compute_hash(oop protection_domain) { return (unsigned int)(protection_domain->identity_hash()); } int index_for(oop protection_domain) { return hash_to_index(compute_hash(protection_domain)); } ProtectionDomainCacheEntry* add_entry(int index, unsigned int hash, oop protection_domain); ProtectionDomainCacheEntry* find_entry(int index, oop protection_domain); public: ProtectionDomainCacheTable(int table_size); ProtectionDomainCacheEntry* get(oop protection_domain); void free(ProtectionDomainCacheEntry* entry); void unlink(BoolObjectClosure* cl); // GC support void oops_do(OopClosure* f); void always_strong_oops_do(OopClosure* f); static uint bucket_size(); void print() PRODUCT_RETURN; void verify(); }; class ProtectionDomainEntry :public CHeapObj<mtClass> { friend class VMStructs; public: ProtectionDomainEntry* _next; ProtectionDomainCacheEntry* _pd_cache; ProtectionDomainEntry(ProtectionDomainCacheEntry* pd_cache, ProtectionDomainEntry* next) { _pd_cache = pd_cache; _next = next; } ProtectionDomainEntry* next() { return _next; } oop protection_domain() { return _pd_cache->protection_domain(); } }; // An entry in the system dictionary, this describes a class as // { Klass*, loader, protection_domain }. class DictionaryEntry : public HashtableEntry<Klass*, mtClass> { friend class VMStructs; private: // Contains the set of approved protection domains that can access // this system dictionary entry. // // This protection domain set is a set of tuples: // // (InstanceKlass C, initiating class loader ICL, Protection Domain PD) // // [Note that C.protection_domain(), which is stored in the java.lang.Class // mirror of C, is NOT the same as PD] // // If such an entry (C, ICL, PD) exists in the table, it means that // it is okay for a class Foo to reference C, where // // Foo.protection_domain() == PD, and // Foo's defining class loader == ICL // // The usage of the PD set can be seen in SystemDictionary::validate_protection_domain() // It is essentially a cache to avoid repeated Java up-calls to // ClassLoader.checkPackageAccess(). // ProtectionDomainEntry* _pd_set; ClassLoaderData* _loader_data; 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(Dictionary* dict, oop protection_domain); Klass* klass() const { return (Klass*)literal(); } Klass** klass_addr() { return (Klass**)literal_addr(); } DictionaryEntry* next() const { return (DictionaryEntry*)HashtableEntry<Klass*, mtClass>::next(); } DictionaryEntry** next_addr() { return (DictionaryEntry**)HashtableEntry<Klass*, mtClass>::next_addr(); } ClassLoaderData* loader_data() const { return _loader_data; } void set_loader_data(ClassLoaderData* loader_data) { _loader_data = loader_data; } 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 set_strongly_reachable() { for (ProtectionDomainEntry* current = _pd_set; current != NULL; current = current->_next) { current->_pd_cache->set_strongly_reachable(); } } void verify_protection_domain_set() { for (ProtectionDomainEntry* current = _pd_set; current != NULL; current = current->_next) { current->_pd_cache->protection_domain()->verify(); } } bool equals(Symbol* class_name, ClassLoaderData* loader_data) const { Klass* klass = (Klass*)literal(); return (InstanceKlass::cast(klass)->name() == class_name && _loader_data == loader_data); } 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 Symbol* // to a managed and an unmanaged pointer. class SymbolPropertyEntry : public HashtableEntry<Symbol*, mtSymbol> { friend class VMStructs; private: intptr_t _symbol_mode; // secondary key Method* _method; oop _method_type; public: Symbol* symbol() const { return literal(); } intptr_t symbol_mode() const { return _symbol_mode; } void set_symbol_mode(intptr_t m) { _symbol_mode = m; } Method* method() const { return _method; } void set_method(Method* p) { _method = p; } oop method_type() const { return _method_type; } oop* method_type_addr() { return &_method_type; } void set_method_type(oop p) { _method_type = p; } SymbolPropertyEntry* next() const { return (SymbolPropertyEntry*)HashtableEntry<Symbol*, mtSymbol>::next(); } SymbolPropertyEntry** next_addr() { return (SymbolPropertyEntry**)HashtableEntry<Symbol*, mtSymbol>::next_addr(); } void print_on(outputStream* st) const { symbol()->print_value_on(st); st->print("/mode="INTX_FORMAT, symbol_mode()); st->print(" -> "); bool printed = false; if (method() != NULL) { method()->print_value_on(st); printed = true; } if (method_type() != NULL) { if (printed) st->print(" and "); st->print(INTPTR_FORMAT, p2i((void *)method_type())); 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<Symbol*, mtSymbol> { friend class VMStructs; private: SymbolPropertyEntry* bucket(int i) { return (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::bucket(i); } // The following method is not MT-safe and must be done under lock. SymbolPropertyEntry** bucket_addr(int i) { return (SymbolPropertyEntry**) Hashtable<Symbol*, mtSymbol>::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, Symbol* symbol, intptr_t symbol_mode) { SymbolPropertyEntry* entry = (SymbolPropertyEntry*) Hashtable<Symbol*, mtSymbol>::new_entry(hash, symbol); // Hashtable with Symbol* literal must increment and decrement refcount. symbol->increment_refcount(); entry->set_symbol_mode(symbol_mode); entry->set_method(NULL); entry->set_method_type(NULL); return entry; } public: SymbolPropertyTable(int table_size); SymbolPropertyTable(int table_size, HashtableBucket<mtSymbol>* t, int number_of_entries); void free_entry(SymbolPropertyEntry* entry) { // decrement Symbol refcount here because hashtable doesn't. entry->literal()->decrement_refcount(); Hashtable<Symbol*, mtSymbol>::free_entry(entry); } unsigned int compute_hash(Symbol* sym, intptr_t symbol_mode) { // Use the regular identity_hash. return Hashtable<Symbol*, mtSymbol>::compute_hash(sym) ^ symbol_mode; } int index_for(Symbol* 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, Symbol* name, intptr_t name_mode); // must be done under SystemDictionary_lock SymbolPropertyEntry* add_entry(int index, unsigned int hash, Symbol* name, intptr_t name_mode); // GC support void oops_do(OopClosure* f); void methods_do(void f(Method*)); // Sharing support void reorder_dictionary(); #ifndef PRODUCT void print(); #endif void verify(); }; #endif // SHARE_VM_CLASSFILE_DICTIONARY_HPP