| author | jmasa |
| Fri, 26 Sep 2014 17:48:10 -0400 | |
| changeset 28510 | 4f1d3611e0bc |
| parent 27247 | 99db666dbe8e |
| child 29576 | c223b0a9872e |
| permissions | -rw-r--r-- |
/* * Copyright (c) 1997, 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_SYSTEMDICTIONARY_HPP #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP #include "classfile/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "oops/objArrayOop.hpp" #include "oops/symbol.hpp" #include "runtime/java.hpp" #include "runtime/reflectionUtils.hpp" #include "utilities/hashtable.hpp" #include "utilities/hashtable.inline.hpp" // The system dictionary stores all loaded classes and maps: // // [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass* // // Classes are loaded lazily. The default VM class loader is // represented as NULL. // The underlying data structure is an open hash table with a fixed number // of buckets. During loading the loader object is locked, (for the VM loader // a private lock object is used). Class loading can thus be done concurrently, // but only by different loaders. // // During loading a placeholder (name, loader) is temporarily placed in // a side data structure, and is used to detect ClassCircularityErrors // and to perform verification during GC. A GC can occur in the midst // of class loading, as we call out to Java, have to take locks, etc. // // When class loading is finished, a new entry is added to the system // dictionary and the place holder is removed. Note that the protection // domain field of the system dictionary has not yet been filled in when // the "real" system dictionary entry is created. // // Clients of this class who are interested in finding if a class has // been completely loaded -- not classes in the process of being loaded -- // can read the SystemDictionary unlocked. This is safe because // - entries are only deleted at safepoints // - readers cannot come to a safepoint while actively examining // an entry (an entry cannot be deleted from under a reader) // - entries must be fully formed before they are available to concurrent // readers (we must ensure write ordering) // // Note that placeholders are deleted at any time, as they are removed // when a class is completely loaded. Therefore, readers as well as writers // of placeholders must hold the SystemDictionary_lock. // class Dictionary; class PlaceholderTable; class LoaderConstraintTable; template <MEMFLAGS F> class HashtableBucket; class ResolutionErrorTable; class SymbolPropertyTable; class Ticks; // Certain classes are preloaded, such as java.lang.Object and java.lang.String. // They are all "well-known", in the sense that no class loader is allowed // to provide a different definition. // // These klasses must all have names defined in vmSymbols. #define WK_KLASS_ENUM_NAME(kname) kname##_knum // Each well-known class has a short klass name (like object_klass), // a vmSymbol name (like java_lang_Object), and a flag word // that makes some minor distinctions, like whether the klass // is preloaded, optional, release-specific, etc. // The order of these definitions is significant; it is the order in which // preloading is actually performed by initialize_preloaded_classes. #define WK_KLASSES_DO(do_klass) \ /* well-known classes */ \ do_klass(Object_klass, java_lang_Object, Pre ) \ do_klass(String_klass, java_lang_String, Pre ) \ do_klass(Class_klass, java_lang_Class, Pre ) \ do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \ do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \ do_klass(Serializable_klass, java_io_Serializable, Pre ) \ do_klass(System_klass, java_lang_System, Pre ) \ do_klass(Throwable_klass, java_lang_Throwable, Pre ) \ do_klass(Error_klass, java_lang_Error, Pre ) \ do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \ do_klass(Exception_klass, java_lang_Exception, Pre ) \ do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \ do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \ do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \ do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \ do_klass(SecureClassLoader_klass, java_security_SecureClassLoader, Pre ) \ do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \ do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \ do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \ do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \ do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \ do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \ do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \ do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \ do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \ do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \ \ /* Preload ref klasses and set reference types */ \ do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \ do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \ do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \ do_klass(Cleaner_klass, sun_misc_Cleaner, Pre ) \ do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ \ do_klass(Thread_klass, java_lang_Thread, Pre ) \ do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \ do_klass(Properties_klass, java_util_Properties, Pre ) \ do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \ do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \ do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \ do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \ do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \ \ /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Pre ) \ do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Pre ) \ do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt ) \ do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt ) \ do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \ \ /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \ do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre ) \ do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \ do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre ) \ do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre ) \ do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre ) \ do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre ) \ do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre ) \ do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre ) \ do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre ) \ /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ \ do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \ \ /* support for CDS */ \ do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \ do_klass(File_klass, java_io_File, Pre ) \ do_klass(URLClassLoader_klass, java_net_URLClassLoader, Pre ) \ do_klass(URL_klass, java_net_URL, Pre ) \ do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \ do_klass(sun_misc_Launcher_klass, sun_misc_Launcher, Pre ) \ do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \ \ /* It's NULL in non-1.4 JDKs. */ \ do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \ \ /* Preload boxing klasses */ \ do_klass(Boolean_klass, java_lang_Boolean, Pre ) \ do_klass(Character_klass, java_lang_Character, Pre ) \ do_klass(Float_klass, java_lang_Float, Pre ) \ do_klass(Double_klass, java_lang_Double, Pre ) \ do_klass(Byte_klass, java_lang_Byte, Pre ) \ do_klass(Short_klass, java_lang_Short, Pre ) \ do_klass(Integer_klass, java_lang_Integer, Pre ) \ do_klass(Long_klass, java_lang_Long, Pre ) \ /*end*/ class SystemDictionary : AllStatic { friend class VMStructs; friend class SystemDictionaryHandles; public: enum WKID { NO_WKID = 0, #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name), WK_KLASSES_DO(WK_KLASS_ENUM) #undef WK_KLASS_ENUM WKID_LIMIT, FIRST_WKID = NO_WKID + 1 }; enum InitOption { Pre, // preloaded; error if not present // Order is significant. Options before this point require resolve_or_fail. // Options after this point will use resolve_or_null instead. Opt, // preload tried; NULL if not present OPTION_LIMIT, CEIL_LG_OPTION_LIMIT = 2 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT) }; // Returns a class with a given class name and class loader. Loads the // class if needed. If not found a NoClassDefFoundError or a // ClassNotFoundException is thrown, depending on the value on the // throw_error flag. For most uses the throw_error argument should be set // to true. static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); // Convenient call for null loader and protection domain. static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS); protected: // handle error translation for resolve_or_null results static Klass* handle_resolution_exception(Symbol* class_name, bool throw_error, KlassHandle klass_h, TRAPS); public: // Returns a class with a given class name and class loader. // Loads the class if needed. If not found NULL is returned. static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); // Version with null loader and protection domain static Klass* resolve_or_null(Symbol* class_name, TRAPS); // Resolve a superclass or superinterface. Called from ClassFileParser, // parse_interfaces, resolve_instance_class_or_null, load_shared_class // "child_name" is the class whose super class or interface is being resolved. static Klass* resolve_super_or_fail(Symbol* child_name, Symbol* class_name, Handle class_loader, Handle protection_domain, bool is_superclass, TRAPS); // Parse new stream. This won't update the system dictionary or // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. static Klass* parse_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS) { KlassHandle nullHandle; return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD); } static Klass* parse_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, KlassHandle host_klass, GrowableArray<Handle>* cp_patches, TRAPS); // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, bool verify, TRAPS); // Lookup an already loaded class. If not found NULL is returned. static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); // Lookup an already loaded instance or array class. // Do not make any queries to class loaders; consult only the cache. // If not found NULL is returned. static Klass* find_instance_or_array_klass(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); // Lookup an instance or array class that has already been loaded // either into the given class loader, or else into another class // loader that is constrained (via loader constraints) to produce // a consistent class. Do not take protection domains into account. // Do not make any queries to class loaders; consult only the cache. // Return NULL if the class is not found. // // This function is a strict superset of find_instance_or_array_klass. // This function (the unchecked version) makes a conservative prediction // of the result of the checked version, assuming successful lookup. // If both functions return non-null, they must return the same value. // Also, the unchecked version may sometimes be non-null where the // checked version is null. This can occur in several ways: // 1. No query has yet been made to the class loader. // 2. The class loader was queried, but chose not to delegate. // 3. ClassLoader.checkPackageAccess rejected a proposed protection domain. // 4. Loading was attempted, but there was a linkage error of some sort. // In all of these cases, the loader constraints on this type are // satisfied, and it is safe for classes in the given class loader // to manipulate strongly-typed values of the found class, subject // to local linkage and access checks. static Klass* find_constrained_instance_or_array_klass(Symbol* class_name, Handle class_loader, TRAPS); // Iterate over all klasses in dictionary // Just the classes from defining class loaders static void classes_do(void f(Klass*)); // Added for initialize_itable_for_klass to handle exceptions static void classes_do(void f(Klass*, TRAPS), TRAPS); // All classes, and their class loaders static void classes_do(void f(Klass*, ClassLoaderData*)); static void placeholders_do(void f(Symbol*)); // Iterate over all methods in all klasses in dictionary static void methods_do(void f(Method*)); // Garbage collection support // This method applies "blk->do_oop" to all the pointers to "system" // classes and loaders. static void always_strong_oops_do(OopClosure* blk); static void always_strong_classes_do(KlassClosure* closure); // Unload (that is, break root links to) all unmarked classes and // loaders. Returns "true" iff something was unloaded. static bool do_unloading(BoolObjectClosure* is_alive, bool clean_alive = true); // Used by DumpSharedSpaces only to remove classes that failed verification static void remove_classes_in_error_state(); static int calculate_systemdictionary_size(int loadedclasses); // Applies "f->do_oop" to all root oops in the system dictionary. static void oops_do(OopClosure* f); static void roots_oops_do(OopClosure* strong, OopClosure* weak); // System loader lock static oop system_loader_lock() { return _system_loader_lock_obj; } protected: // Extended Redefine classes support (tbi) static void preloaded_classes_do(KlassClosure* f); static void lazily_loaded_classes_do(KlassClosure* f); public: // Sharing support. static void reorder_dictionary(); static void copy_buckets(char** top, char* end); static void copy_table(char** top, char* end); static void reverse(); static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length, int number_of_entries); // Printing static void print(bool details = true); static void print_shared(bool details = true); static void print_class_statistics() PRODUCT_RETURN; static void print_method_statistics() PRODUCT_RETURN; // Number of contained klasses // This is both fully loaded classes and classes in the process // of being loaded static int number_of_classes(); // Monotonically increasing counter which grows as classes are // loaded or modifications such as hot-swapping or setting/removing // of breakpoints are performed static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; } // Needed by evolution and breakpoint code static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; } // Verification static void verify(); #ifdef ASSERT static bool is_internal_format(Symbol* class_name); #endif // Initialization static void initialize(TRAPS); // Fast access to commonly used classes (preloaded) static Klass* check_klass(Klass* k) { assert(k != NULL, "preloaded klass not initialized"); return k; } static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } static Klass* check_klass_Opt( Klass* k) { return k; } static bool initialize_wk_klass(WKID id, int init_opt, TRAPS); static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { int limit = (int)end_id + 1; initialize_wk_klasses_until((WKID) limit, start_id, THREAD); } public: #define WK_KLASS_DECLARE(name, symbol, option) \ static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ static Klass** name##_addr() { \ return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ } WK_KLASSES_DO(WK_KLASS_DECLARE); #undef WK_KLASS_DECLARE static Klass* well_known_klass(WKID id) { assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); return _well_known_klasses[id]; } static Klass** well_known_klass_addr(WKID id) { assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); return &_well_known_klasses[id]; } // Local definition for direct access to the private array: #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] static Klass* box_klass(BasicType t) { assert((uint)t < T_VOID+1, "range check"); return check_klass(_box_klasses[t]); } static BasicType box_klass_type(Klass* k); // inverse of box_klass // methods returning lazily loaded klasses // The corresponding method to load the class must be called before calling them. static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } static void load_abstract_ownable_synchronizer_klass(TRAPS); protected: // Tells whether ClassLoader.loadClassInternal is present static bool has_loadClassInternal() { return _has_loadClassInternal; } // Returns the class loader data to be used when looking up/updating the // system dictionary. static ClassLoaderData *class_loader_data(Handle class_loader) { return ClassLoaderData::class_loader_data(class_loader()); } public: // Tells whether ClassLoader.checkPackageAccess is present static bool has_checkPackageAccess() { return _has_checkPackageAccess; } static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; } static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; } static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; } static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; } static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; } // Returns default system loader static oop java_system_loader(); // Compute the default system loader static void compute_java_system_loader(TRAPS); // Register a new class loader static ClassLoaderData* register_loader(Handle class_loader, TRAPS); protected: // Mirrors for primitive classes (created eagerly) static oop check_mirror(oop m) { assert(m != NULL, "mirror not initialized"); return m; } public: // Note: java_lang_Class::primitive_type is the inverse of java_mirror // Check class loader constraints static bool add_loader_constraint(Symbol* name, Handle loader1, Handle loader2, TRAPS); static Symbol* check_signature_loaders(Symbol* signature, Handle loader1, Handle loader2, bool is_method, TRAPS); // JSR 292 // find a java.lang.invoke.MethodHandle.invoke* method for a given signature // (asks Java to compute it if necessary, except in a compiler thread) static methodHandle find_method_handle_invoker(Symbol* name, Symbol* signature, KlassHandle accessing_klass, Handle *appendix_result, Handle *method_type_result, TRAPS); // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic) // (does not ask Java, since this is a low-level intrinsic defined by the JVM) static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid, Symbol* signature, TRAPS); // find a java.lang.invoke.MethodType object for a given signature // (asks Java to compute it if necessary, except in a compiler thread) static Handle find_method_handle_type(Symbol* signature, KlassHandle accessing_klass, TRAPS); // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry static Handle link_method_handle_constant(KlassHandle caller, int ref_kind, //e.g., JVM_REF_invokeVirtual KlassHandle callee, Symbol* name, Symbol* signature, TRAPS); // ask Java to create a dynamic call site, while linking an invokedynamic op static methodHandle find_dynamic_call_site_invoker(KlassHandle caller, Handle bootstrap_method, Symbol* name, Symbol* type, Handle *appendix_result, Handle *method_type_result, TRAPS); // Utility for printing loader "name" as part of tracing constraints static const char* loader_name(oop loader) { return ((loader) == NULL ? "<bootloader>" : InstanceKlass::cast((loader)->klass())->name()->as_C_string() ); } static const char* loader_name(ClassLoaderData* loader_data) { return (loader_data->class_loader() == NULL ? "<bootloader>" : InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() ); } // Record the error when the first attempt to resolve a reference from a constant // pool entry to a class fails. static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error, Symbol* message); static void delete_resolution_error(ConstantPool* pool); static Symbol* find_resolution_error(constantPoolHandle pool, int which, Symbol** message); protected: enum Constants { _loader_constraint_size = 107, // number of entries in constraint table _resolution_error_size = 107, // number of entries in resolution error table _invoke_method_size = 139, // number of entries in invoke method table _nof_buckets = 1009, // number of buckets in hash table for placeholders _old_default_sdsize = 1009, // backward compat for system dictionary size _prime_array_size = 8, // array of primes for system dictionary size _average_depth_goal = 3 // goal for lookup length }; // Static variables // hashtable sizes for system dictionary to allow growth // prime numbers for system dictionary size static int _sdgeneration; static const int _primelist[_prime_array_size]; // Hashtable holding loaded classes. static Dictionary* _dictionary; // Hashtable holding placeholders for classes being loaded. static PlaceholderTable* _placeholders; // Hashtable holding classes from the shared archive. static Dictionary* _shared_dictionary; // Monotonically increasing counter which grows with // _number_of_classes as well as hot-swapping and breakpoint setting // and removal. static int _number_of_modifications; // Lock object for system class loader static oop _system_loader_lock_obj; // Constraints on class loaders static LoaderConstraintTable* _loader_constraints; // Resolution errors static ResolutionErrorTable* _resolution_errors; // Invoke methods (JSR 292) static SymbolPropertyTable* _invoke_method_table; public: // for VM_CounterDecay iteration support friend class CounterDecay; static Klass* try_get_next_class(); protected: static void validate_protection_domain(instanceKlassHandle klass, Handle class_loader, Handle protection_domain, TRAPS); friend class VM_PopulateDumpSharedSpace; friend class TraversePlaceholdersClosure; static Dictionary* dictionary() { return _dictionary; } static Dictionary* shared_dictionary() { return _shared_dictionary; } static PlaceholderTable* placeholders() { return _placeholders; } static LoaderConstraintTable* constraints() { return _loader_constraints; } static ResolutionErrorTable* resolution_errors() { return _resolution_errors; } static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; } // Basic loading operations static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS); static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS); // Wait on SystemDictionary_lock; unlocks lockObject before // waiting; relocks lockObject with correct recursion count // after waiting, but before reentering SystemDictionary_lock // to preserve lock order semantics. static void double_lock_wait(Handle lockObject, TRAPS); static void define_instance_class(instanceKlassHandle k, TRAPS); static instanceKlassHandle find_or_define_instance_class(Symbol* class_name, Handle class_loader, instanceKlassHandle k, TRAPS); static instanceKlassHandle load_shared_class(instanceKlassHandle ik, Handle class_loader, Handle protection_domain, TRAPS); static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS); static Handle compute_loader_lock_object(Handle class_loader, TRAPS); static void check_loader_lock_contention(Handle loader_lock, TRAPS); static bool is_parallelCapable(Handle class_loader); static bool is_parallelDefine(Handle class_loader); public: static instanceKlassHandle load_shared_class(Symbol* class_name, Handle class_loader, TRAPS); static bool is_ext_class_loader(Handle class_loader); protected: static Klass* find_shared_class(Symbol* class_name); // Setup link to hierarchy static void add_to_hierarchy(instanceKlassHandle k, TRAPS); // event based tracing static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k, Handle initiating_loader); // We pass in the hashtable index so we can calculate it outside of // the SystemDictionary_lock. // Basic find on loaded classes static Klass* find_class(int index, unsigned int hash, Symbol* name, ClassLoaderData* loader_data); static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data); // Basic find on classes in the midst of being loaded static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data); // Updating entry in dictionary // Add a completely loaded class static void add_klass(int index, Symbol* class_name, ClassLoaderData* loader_data, KlassHandle obj); // Add a placeholder for a class being loaded static void add_placeholder(int index, Symbol* class_name, ClassLoaderData* loader_data); static void remove_placeholder(int index, Symbol* class_name, ClassLoaderData* loader_data); // Performs cleanups after resolve_super_or_fail. This typically needs // to be called on failure. // Won't throw, but can block. static void resolution_cleanups(Symbol* class_name, ClassLoaderData* loader_data, TRAPS); // Initialization static void initialize_preloaded_classes(TRAPS); // Class loader constraints static void check_constraints(int index, unsigned int hash, instanceKlassHandle k, Handle loader, bool defining, TRAPS); static void update_dictionary(int d_index, unsigned int d_hash, int p_index, unsigned int p_hash, instanceKlassHandle k, Handle loader, TRAPS); // Variables holding commonly used klasses (preloaded) static Klass* _well_known_klasses[]; // Lazily loaded klasses static Klass* volatile _abstract_ownable_synchronizer_klass; // table of box klasses (int_klass, etc.) static Klass* _box_klasses[T_VOID+1]; static oop _java_system_loader; static bool _has_loadClassInternal; static bool _has_checkPackageAccess; }; #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP