/* * Copyright (c) 1997, 2018, 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/classLoader.hpp" #include "jvmci/systemDictionary_jvmci.hpp" #include "oops/objArrayOop.hpp" #include "oops/symbol.hpp" #include "runtime/java.hpp" #include "runtime/reflectionUtils.hpp" #include "runtime/signature.hpp" #include "utilities/hashtable.hpp" // The dictionary in each ClassLoaderData stores all loaded classes, either // initiatied by its class loader or defined by its class loader: // // class loader -> ClassLoaderData -> [class, protection domain set] // // Classes are loaded lazily. The default VM class loader is // represented as NULL. // The underlying data structure is an open hash table (Dictionary) per // ClassLoaderData with a fixed number of buckets. During loading the // class loader object is locked, (for the VM loader a private lock object is used). // The global SystemDictionary_lock is held for all additions into the ClassLoaderData // dictionaries. TODO: fix lock granularity so that class loading can // 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 dictionary // of the class loader and the placeholder is removed. Note that the protection // domain field of the dictionary entry has not yet been filled in when // the "real" 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 dictionary 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 ClassFileStream; class Dictionary; class PlaceholderTable; class LoaderConstraintTable; template class HashtableBucket; class ResolutionErrorTable; class SymbolPropertyTable; class ProtectionDomainCacheTable; class ProtectionDomainCacheEntry; class GCTimer; class OopStorage; #define WK_KLASS_ENUM_NAME(kname) kname##_knum // Certain classes, such as java.lang.Object and java.lang.String, // are "well-known", in the sense that no class loader is allowed // to provide a different definition. // // Each well-known class has a short klass name (like object_klass), // and a vmSymbol name (like java_lang_Object). // // The order of these definitions is significant: the classes are // resolved during early VM start-up by resolve_well_known_classes // in this order. Changing the order may require careful restructuring // of the VM start-up sequence. // #define WK_KLASSES_DO(do_klass) \ /* well-known classes */ \ do_klass(Object_klass, java_lang_Object ) \ do_klass(String_klass, java_lang_String ) \ do_klass(Class_klass, java_lang_Class ) \ do_klass(Cloneable_klass, java_lang_Cloneable ) \ do_klass(ClassLoader_klass, java_lang_ClassLoader ) \ do_klass(Serializable_klass, java_io_Serializable ) \ do_klass(System_klass, java_lang_System ) \ do_klass(Throwable_klass, java_lang_Throwable ) \ do_klass(Error_klass, java_lang_Error ) \ do_klass(ThreadDeath_klass, java_lang_ThreadDeath ) \ do_klass(Exception_klass, java_lang_Exception ) \ do_klass(RuntimeException_klass, java_lang_RuntimeException ) \ do_klass(SecurityManager_klass, java_lang_SecurityManager ) \ do_klass(ProtectionDomain_klass, java_security_ProtectionDomain ) \ do_klass(AccessControlContext_klass, java_security_AccessControlContext ) \ do_klass(AccessController_klass, java_security_AccessController ) \ do_klass(SecureClassLoader_klass, java_security_SecureClassLoader ) \ do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException ) \ do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError ) \ do_klass(LinkageError_klass, java_lang_LinkageError ) \ do_klass(ClassCastException_klass, java_lang_ClassCastException ) \ do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException ) \ do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError ) \ do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError ) \ do_klass(StackOverflowError_klass, java_lang_StackOverflowError ) \ do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException ) \ do_klass(Reference_klass, java_lang_ref_Reference ) \ \ /* ref klasses and set reference types */ \ do_klass(SoftReference_klass, java_lang_ref_SoftReference ) \ do_klass(WeakReference_klass, java_lang_ref_WeakReference ) \ do_klass(FinalReference_klass, java_lang_ref_FinalReference ) \ do_klass(PhantomReference_klass, java_lang_ref_PhantomReference ) \ do_klass(Finalizer_klass, java_lang_ref_Finalizer ) \ \ do_klass(Thread_klass, java_lang_Thread ) \ do_klass(ThreadGroup_klass, java_lang_ThreadGroup ) \ do_klass(Properties_klass, java_util_Properties ) \ do_klass(Module_klass, java_lang_Module ) \ do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject ) \ do_klass(reflect_Field_klass, java_lang_reflect_Field ) \ do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter ) \ do_klass(reflect_Method_klass, java_lang_reflect_Method ) \ do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor ) \ \ /* 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, reflect_MagicAccessorImpl ) \ do_klass(reflect_MethodAccessorImpl_klass, reflect_MethodAccessorImpl ) \ do_klass(reflect_ConstructorAccessorImpl_klass, reflect_ConstructorAccessorImpl ) \ do_klass(reflect_DelegatingClassLoader_klass, reflect_DelegatingClassLoader ) \ do_klass(reflect_ConstantPool_klass, reflect_ConstantPool ) \ do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl ) \ do_klass(reflect_CallerSensitive_klass, reflect_CallerSensitive ) \ \ /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle ) \ do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle ) \ do_klass(VarHandle_klass, java_lang_invoke_VarHandle ) \ do_klass(MemberName_klass, java_lang_invoke_MemberName ) \ do_klass(ResolvedMethodName_klass, java_lang_invoke_ResolvedMethodName ) \ do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives ) \ do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm ) \ do_klass(MethodType_klass, java_lang_invoke_MethodType ) \ do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError ) \ do_klass(CallSite_klass, java_lang_invoke_CallSite ) \ do_klass(Context_klass, java_lang_invoke_MethodHandleNatives_CallSiteContext ) \ do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite ) \ do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite ) \ do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite ) \ /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ \ do_klass(AssertionStatusDirectives_klass, java_lang_AssertionStatusDirectives ) \ do_klass(StringBuffer_klass, java_lang_StringBuffer ) \ do_klass(StringBuilder_klass, java_lang_StringBuilder ) \ do_klass(internal_Unsafe_klass, jdk_internal_misc_Unsafe ) \ do_klass(module_Modules_klass, jdk_internal_module_Modules ) \ \ /* support for CDS */ \ do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream ) \ do_klass(URL_klass, java_net_URL ) \ do_klass(Jar_Manifest_klass, java_util_jar_Manifest ) \ do_klass(jdk_internal_loader_ClassLoaders_klass, jdk_internal_loader_ClassLoaders ) \ do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass, jdk_internal_loader_ClassLoaders_AppClassLoader) \ do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader) \ do_klass(CodeSource_klass, java_security_CodeSource ) \ \ do_klass(StackTraceElement_klass, java_lang_StackTraceElement ) \ \ /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ do_klass(nio_Buffer_klass, java_nio_Buffer ) \ \ /* Stack Walking */ \ do_klass(StackWalker_klass, java_lang_StackWalker ) \ do_klass(AbstractStackWalker_klass, java_lang_StackStreamFactory_AbstractStackWalker ) \ do_klass(StackFrameInfo_klass, java_lang_StackFrameInfo ) \ do_klass(LiveStackFrameInfo_klass, java_lang_LiveStackFrameInfo ) \ \ /* support for stack dump lock analysis */ \ do_klass(java_util_concurrent_locks_AbstractOwnableSynchronizer_klass, java_util_concurrent_locks_AbstractOwnableSynchronizer) \ \ /* boxing klasses */ \ do_klass(Boolean_klass, java_lang_Boolean ) \ do_klass(Character_klass, java_lang_Character ) \ do_klass(Float_klass, java_lang_Float ) \ do_klass(Double_klass, java_lang_Double ) \ do_klass(Byte_klass, java_lang_Byte ) \ do_klass(Short_klass, java_lang_Short ) \ do_klass(Integer_klass, java_lang_Integer ) \ do_klass(Long_klass, java_lang_Long ) \ \ /* JVMCI classes. These are loaded on-demand. */ \ JVMCI_WK_KLASSES_DO(do_klass) \ \ /*end*/ class SystemDictionary : AllStatic { friend class VMStructs; friend class SystemDictionaryHandles; public: enum WKID { NO_WKID = 0, #define WK_KLASS_ENUM(name, symbol) 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, #if INCLUDE_JVMCI FIRST_JVMCI_WKID = WK_KLASS_ENUM_NAME(JVMCI_klass), LAST_JVMCI_WKID = WK_KLASS_ENUM_NAME(Value_klass), #endif FIRST_WKID = NO_WKID + 1 }; // 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, Klass* klass, 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 InstanceKlass* 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 dictionary or // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses. // Also used by Unsafe_DefineAnonymousClass static InstanceKlass* parse_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS) { return parse_stream(class_name, class_loader, protection_domain, st, NULL, // unsafe_anonymous_host NULL, // cp_patches THREAD); } static InstanceKlass* parse_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, const InstanceKlass* unsafe_anonymous_host, GrowableArray* cp_patches, TRAPS); // Resolve from stream (called by jni_DefineClass and JVM_DefineClass) static InstanceKlass* resolve_from_stream(Symbol* class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, 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); static void classes_do(MetaspaceClosure* it); // Iterate over all methods in all klasses static void methods_do(void f(Method*)); // Garbage collection support // Unload (that is, break root links to) all unmarked classes and // loaders. Returns "true" iff something was unloaded. static bool do_unloading(GCTimer* gc_timer, bool do_cleaning = 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); // System loader lock static oop system_loader_lock() { return _system_loader_lock_obj; } // Protection Domain Table static ProtectionDomainCacheTable* pd_cache_table() { return _pd_cache_table; } public: // Sharing support. static void reorder_dictionary_for_sharing() NOT_CDS_RETURN; static void combine_shared_dictionaries(); static size_t count_bytes_for_buckets(); static size_t count_bytes_for_table(); static void copy_buckets(char* top, char* end); static void copy_table(char* top, char* end); static void set_shared_dictionary(HashtableBucket* t, int length, int number_of_entries); // Printing static void print() { return print_on(tty); } static void print_on(outputStream* st); static void print_shared(outputStream* st); static void dump(outputStream* st, bool verbose); // 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(); // Initialization static void initialize(TRAPS); // Checked fast access to the well-known classes -- so that you don't try to use them // before they are resolved. static InstanceKlass* check_klass(InstanceKlass* k) { assert(k != NULL, "klass not loaded"); return k; } static bool resolve_wk_klass(WKID id, TRAPS); static void resolve_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS); static void resolve_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) { int limit = (int)end_id + 1; resolve_wk_klasses_until((WKID) limit, start_id, THREAD); } public: #define WK_KLASS_DECLARE(name, symbol) \ static InstanceKlass* name() { return check_klass(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ static InstanceKlass** name##_addr() { \ return &_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ } \ static bool name##_is_loaded() { \ return _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] != NULL; \ } WK_KLASSES_DO(WK_KLASS_DECLARE); #undef WK_KLASS_DECLARE static InstanceKlass* well_known_klass(WKID id) { assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); return _well_known_klasses[id]; } static InstanceKlass** well_known_klass_addr(WKID id) { assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob"); return &_well_known_klasses[id]; } static void well_known_klasses_do(MetaspaceClosure* it); // Local definition for direct access to the private array: #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] static InstanceKlass* 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 #ifdef ASSERT static bool is_well_known_klass(Klass* k) { return is_well_known_klass(k->name()); } static bool is_well_known_klass(Symbol* class_name); #endif protected: // 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 java system loader static oop java_system_loader(); // Returns java platform loader static oop java_platform_loader(); // Compute the java system and platform loaders static void compute_java_loaders(TRAPS); // Register a new class loader static ClassLoaderData* register_loader(Handle class_loader); 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(Klass* klass, Symbol* name, Symbol* signature, Klass* 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); // compute java_mirror (java.lang.Class instance) for a type ("I", "[[B", "LFoo;", etc.) // Either the accessing_klass or the CL/PD can be non-null, but not both. static Handle find_java_mirror_for_type(Symbol* signature, Klass* accessing_klass, Handle class_loader, Handle protection_domain, SignatureStream::FailureMode failure_mode, TRAPS); static Handle find_java_mirror_for_type(Symbol* signature, Klass* accessing_klass, SignatureStream::FailureMode failure_mode, TRAPS) { // callee will fill in CL/PD from AK, if they are needed return find_java_mirror_for_type(signature, accessing_klass, Handle(), Handle(), failure_mode, THREAD); } // fast short-cut for the one-character case: static oop find_java_mirror_for_type(char signature_char); // 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, Klass* accessing_klass, TRAPS); // find a java.lang.Class object for a given signature static Handle find_field_handle_type(Symbol* signature, Klass* accessing_klass, TRAPS); // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry static Handle link_method_handle_constant(Klass* caller, int ref_kind, //e.g., JVM_REF_invokeVirtual Klass* callee, Symbol* name, Symbol* signature, TRAPS); // ask Java to compute a constant by invoking a BSM given a Dynamic_info CP entry static Handle link_dynamic_constant(Klass* caller, int condy_index, Handle bootstrap_specifier, Symbol* name, Symbol* type, TRAPS); // ask Java to create a dynamic call site, while linking an invokedynamic op static methodHandle find_dynamic_call_site_invoker(Klass* caller, int indy_index, Handle bootstrap_method, Symbol* name, Symbol* type, Handle *appendix_result, Handle *method_type_result, TRAPS); // 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(const constantPoolHandle& pool, int which, Symbol* error, Symbol* message); static void delete_resolution_error(ConstantPool* pool); static Symbol* find_resolution_error(const constantPoolHandle& pool, int which, Symbol** message); static ProtectionDomainCacheEntry* cache_get(Handle protection_domain); 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 _shared_dictionary_size = 1009, // number of entries in shared dictionary _placeholder_table_size = 1009 // number of entries in hash table for placeholders }; // Static tables owned by the SystemDictionary // 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 // loading 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; // ProtectionDomain cache static ProtectionDomainCacheTable* _pd_cache_table; // VM weak OopStorage object. static OopStorage* _vm_weak_oop_storage; protected: static void validate_protection_domain(InstanceKlass* klass, Handle class_loader, Handle protection_domain, TRAPS); friend class VM_PopulateDumpSharedSpace; friend class TraversePlaceholdersClosure; 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 InstanceKlass* resolve_instance_class_or_null_helper(Symbol* name, Handle class_loader, Handle protection_domain, TRAPS); static InstanceKlass* 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 InstanceKlass* 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(InstanceKlass* k, TRAPS); static InstanceKlass* find_or_define_instance_class(Symbol* class_name, Handle class_loader, InstanceKlass* k, TRAPS); static bool is_shared_class_visible(Symbol* class_name, InstanceKlass* ik, Handle class_loader, TRAPS); static InstanceKlass* load_shared_class(InstanceKlass* ik, Handle class_loader, Handle protection_domain, TRAPS); static InstanceKlass* load_shared_boot_class(Symbol* class_name, TRAPS); static InstanceKlass* 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 bool is_system_class_loader(oop class_loader); static bool is_platform_class_loader(oop class_loader); static void clear_invoke_method_table(); // Returns TRUE if the method is a non-public member of class java.lang.Object. static bool is_nonpublic_Object_method(Method* m) { assert(m != NULL, "Unexpected NULL Method*"); return !m->is_public() && m->method_holder() == SystemDictionary::Object_klass(); } static void initialize_oop_storage(); static OopStorage* vm_weak_oop_storage(); protected: static InstanceKlass* find_shared_class(Symbol* class_name); // Setup link to hierarchy static void add_to_hierarchy(InstanceKlass* k, TRAPS); // Basic find on loaded classes static InstanceKlass* find_class(unsigned int hash, Symbol* name, Dictionary* dictionary); static InstanceKlass* 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); // 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); // Resolve well-known classes so they can be used like SystemDictionary::String_klass() static void resolve_well_known_classes(TRAPS); // Class loader constraints static void check_constraints(unsigned int hash, InstanceKlass* k, Handle loader, bool defining, TRAPS); static void update_dictionary(unsigned int d_hash, int p_index, unsigned int p_hash, InstanceKlass* k, Handle loader, TRAPS); static InstanceKlass* _well_known_klasses[]; // table of box klasses (int_klass, etc.) static InstanceKlass* _box_klasses[T_VOID+1]; private: static oop _java_system_loader; static oop _java_platform_loader; static bool _has_checkPackageAccess; }; #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP