| /* |
| * Copyright 1997-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| // The system dictionary stores all loaded classes and maps: |
| // |
| // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop |
| // |
| // 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; |
| class HashtableBucket; |
| class ResolutionErrorTable; |
| class SymbolPropertyTable; |
| |
| // 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(template) \ |
| /* well-known classes */ \ |
| template(object_klass, java_lang_Object, Pre) \ |
| template(string_klass, java_lang_String, Pre) \ |
| template(class_klass, java_lang_Class, Pre) \ |
| template(cloneable_klass, java_lang_Cloneable, Pre) \ |
| template(classloader_klass, java_lang_ClassLoader, Pre) \ |
| template(serializable_klass, java_io_Serializable, Pre) \ |
| template(system_klass, java_lang_System, Pre) \ |
| template(throwable_klass, java_lang_Throwable, Pre) \ |
| template(error_klass, java_lang_Error, Pre) \ |
| template(threaddeath_klass, java_lang_ThreadDeath, Pre) \ |
| template(exception_klass, java_lang_Exception, Pre) \ |
| template(runtime_exception_klass, java_lang_RuntimeException, Pre) \ |
| template(protectionDomain_klass, java_security_ProtectionDomain, Pre) \ |
| template(AccessControlContext_klass, java_security_AccessControlContext, Pre) \ |
| template(classNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \ |
| template(noClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre) \ |
| template(linkageError_klass, java_lang_LinkageError, Pre) \ |
| template(ClassCastException_klass, java_lang_ClassCastException, Pre) \ |
| template(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre) \ |
| template(virtualMachineError_klass, java_lang_VirtualMachineError, Pre) \ |
| template(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre) \ |
| template(StackOverflowError_klass, java_lang_StackOverflowError, Pre) \ |
| template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \ |
| template(reference_klass, java_lang_ref_Reference, Pre) \ |
| \ |
| /* Preload ref klasses and set reference types */ \ |
| template(soft_reference_klass, java_lang_ref_SoftReference, Pre) \ |
| template(weak_reference_klass, java_lang_ref_WeakReference, Pre) \ |
| template(final_reference_klass, java_lang_ref_FinalReference, Pre) \ |
| template(phantom_reference_klass, java_lang_ref_PhantomReference, Pre) \ |
| template(finalizer_klass, java_lang_ref_Finalizer, Pre) \ |
| \ |
| template(thread_klass, java_lang_Thread, Pre) \ |
| template(threadGroup_klass, java_lang_ThreadGroup, Pre) \ |
| template(properties_klass, java_util_Properties, Pre) \ |
| template(reflect_accessible_object_klass, java_lang_reflect_AccessibleObject, Pre) \ |
| template(reflect_field_klass, java_lang_reflect_Field, Pre) \ |
| template(reflect_method_klass, java_lang_reflect_Method, Pre) \ |
| template(reflect_constructor_klass, java_lang_reflect_Constructor, Pre) \ |
| \ |
| /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ |
| /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
| /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
| template(reflect_magic_klass, sun_reflect_MagicAccessorImpl, Opt) \ |
| template(reflect_method_accessor_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
| template(reflect_constructor_accessor_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
| template(reflect_delegating_classloader_klass, sun_reflect_DelegatingClassLoader, Opt) \ |
| template(reflect_constant_pool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15) \ |
| template(reflect_unsafe_static_field_accessor_impl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \ |
| \ |
| /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ |
| template(MethodHandle_klass, java_dyn_MethodHandle, Opt) \ |
| template(MemberName_klass, sun_dyn_MemberName, Opt) \ |
| template(MethodHandleImpl_klass, sun_dyn_MethodHandleImpl, Opt) \ |
| template(AdapterMethodHandle_klass, sun_dyn_AdapterMethodHandle, Opt) \ |
| template(BoundMethodHandle_klass, sun_dyn_BoundMethodHandle, Opt) \ |
| template(DirectMethodHandle_klass, sun_dyn_DirectMethodHandle, Opt) \ |
| template(MethodType_klass, java_dyn_MethodType, Opt) \ |
| template(MethodTypeForm_klass, java_dyn_MethodTypeForm, Opt) \ |
| template(WrongMethodTypeException_klass, java_dyn_WrongMethodTypeException, Opt) \ |
| template(Linkage_klass, java_dyn_Linkage, Opt) \ |
| template(CallSite_klass, java_dyn_CallSite, Opt) \ |
| template(CallSiteImpl_klass, sun_dyn_CallSiteImpl, Opt) \ |
| template(Dynamic_klass, java_dyn_Dynamic, Opt) \ |
| /* Note: MethodHandle must be first, and Dynamic last in group */ \ |
| \ |
| template(vector_klass, java_util_Vector, Pre) \ |
| template(hashtable_klass, java_util_Hashtable, Pre) \ |
| template(stringBuffer_klass, java_lang_StringBuffer, Pre) \ |
| \ |
| /* It's NULL in non-1.4 JDKs. */ \ |
| template(stackTraceElement_klass, java_lang_StackTraceElement, Opt) \ |
| /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ |
| /* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \ |
| template(java_nio_Buffer_klass, java_nio_Buffer, Opt) \ |
| \ |
| /* If this class isn't present, it won't be referenced. */ \ |
| template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl, Opt) \ |
| \ |
| template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \ |
| \ |
| /* Preload boxing klasses */ \ |
| template(boolean_klass, java_lang_Boolean, Pre) \ |
| template(char_klass, java_lang_Character, Pre) \ |
| template(float_klass, java_lang_Float, Pre) \ |
| template(double_klass, java_lang_Double, Pre) \ |
| template(byte_klass, java_lang_Byte, Pre) \ |
| template(short_klass, java_lang_Short, Pre) \ |
| template(int_klass, java_lang_Integer, Pre) \ |
| template(long_klass, java_lang_Long, Pre) \ |
| /*end*/ |
| |
| |
| class SystemDictionary : AllStatic { |
| friend class VMStructs; |
| friend class CompactingPermGenGen; |
| friend class SystemDictionaryHandles; |
| NOT_PRODUCT(friend class instanceKlassKlass;) |
| |
| public: |
| enum WKID { |
| NO_WKID = 0, |
| |
| #define WK_KLASS_ENUM(name, ignore_s, ignore_o) 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 |
| Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection |
| Opt_Only_JDK15, // preload tried; use only with JDK1.5+ |
| Opt_Kernel, // preload tried only #ifdef KERNEL |
| OPTION_LIMIT, |
| CEIL_LG_OPTION_LIMIT = 4 // 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 klassOop resolve_or_fail(symbolHandle class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS); |
| // Convenient call for null loader and protection domain. |
| static klassOop resolve_or_fail(symbolHandle class_name, bool throw_error, TRAPS); |
| private: |
| // handle error translation for resolve_or_null results |
| static klassOop handle_resolution_exception(symbolHandle class_name, Handle class_loader, Handle protection_domain, 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 klassOop resolve_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| // Version with null loader and protection domain |
| static klassOop resolve_or_null(symbolHandle 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 klassOop resolve_super_or_fail(symbolHandle child_name, |
| symbolHandle 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 klassOop parse_stream(symbolHandle 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 klassOop parse_stream(symbolHandle 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 klassOop resolve_from_stream(symbolHandle class_name, Handle class_loader, Handle protection_domain, ClassFileStream* st, TRAPS); |
| |
| // Lookup an already loaded class. If not found NULL is returned. |
| static klassOop find(symbolHandle 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 klassOop find_instance_or_array_klass(symbolHandle class_name, |
| Handle class_loader, |
| Handle protection_domain, |
| TRAPS); |
| |
| // If the given name is known to vmSymbols, return the well-know klass: |
| static klassOop find_well_known_klass(symbolOop class_name); |
| |
| // 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 klassOop find_constrained_instance_or_array_klass(symbolHandle 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(klassOop)); |
| // Added for initialize_itable_for_klass to handle exceptions |
| static void classes_do(void f(klassOop, TRAPS), TRAPS); |
| // All classes, and their class loaders |
| static void classes_do(void f(klassOop, oop)); |
| // All classes, and their class loaders |
| // (added for helpers that use HandleMarks and ResourceMarks) |
| static void classes_do(void f(klassOop, oop, TRAPS), TRAPS); |
| // All entries in the placeholder table and their class loaders |
| static void placeholders_do(void f(symbolOop, oop)); |
| |
| // Iterate over all methods in all klasses in dictionary |
| static void methods_do(void f(methodOop)); |
| |
| // 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(OopClosure* blk); |
| // This method applies "blk->do_oop" to all the placeholders. |
| static void placeholders_do(OopClosure* blk); |
| |
| // 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); |
| |
| // 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; } |
| |
| private: |
| // Traverses preloaded oops: various system classes. These are |
| // guaranteed to be in the perm gen. |
| static void preloaded_oops_do(OopClosure* f); |
| static void lazily_loaded_oops_do(OopClosure* 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* t, int length, |
| int number_of_entries); |
| // Printing |
| static void print() PRODUCT_RETURN; |
| 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(symbolHandle class_name); |
| #endif |
| |
| // Verify class is in dictionary |
| static void verify_obj_klass_present(Handle obj, |
| symbolHandle class_name, |
| Handle class_loader); |
| |
| // Initialization |
| static void initialize(TRAPS); |
| |
| // Fast access to commonly used classes (preloaded) |
| static klassOop check_klass(klassOop k) { |
| assert(k != NULL, "preloaded klass not initialized"); |
| return k; |
| } |
| |
| static klassOop check_klass_Pre(klassOop k) { return check_klass(k); } |
| static klassOop check_klass_Opt(klassOop k) { return k; } |
| static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt |
| static klassOop check_klass_Opt_Only_JDK15(klassOop k) { |
| assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
| return k; |
| } |
| static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) { |
| assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only"); |
| // despite the optional loading, if you use this it must be present: |
| return check_klass(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, ignore_symbol, option) \ |
| static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } |
| WK_KLASSES_DO(WK_KLASS_DECLARE); |
| #undef WK_KLASS_DECLARE |
| |
| // Local definition for direct access to the private array: |
| #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] |
| |
| static klassOop box_klass(BasicType t) { |
| assert((uint)t < T_VOID+1, "range check"); |
| return check_klass(_box_klasses[t]); |
| } |
| static BasicType box_klass_type(klassOop k); // inverse of box_klass |
| |
| // methods returning lazily loaded klasses |
| // The corresponding method to load the class must be called before calling them. |
| static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); } |
| |
| static void load_abstract_ownable_synchronizer_klass(TRAPS); |
| |
| private: |
| // Tells whether ClassLoader.loadClassInternal is present |
| static bool has_loadClassInternal() { return _has_loadClassInternal; } |
| |
| public: |
| // Tells whether ClassLoader.checkPackageAccess is present |
| static bool has_checkPackageAccess() { return _has_checkPackageAccess; } |
| |
| static bool class_klass_loaded() { return WK_KLASS(class_klass) != NULL; } |
| static bool cloneable_klass_loaded() { return WK_KLASS(cloneable_klass) != NULL; } |
| |
| // Returns default system loader |
| static oop java_system_loader(); |
| |
| // Compute the default system loader |
| static void compute_java_system_loader(TRAPS); |
| |
| private: |
| // 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(symbolHandle name, Handle loader1, |
| Handle loader2, TRAPS); |
| static char* check_signature_loaders(symbolHandle signature, Handle loader1, |
| Handle loader2, bool is_method, TRAPS); |
| |
| // JSR 292 |
| // find the java.dyn.MethodHandles::invoke method for a given signature |
| static methodOop find_method_handle_invoke(symbolHandle signature, |
| Handle class_loader, |
| Handle protection_domain, |
| TRAPS); |
| // ask Java to compute the java.dyn.MethodType object for a given signature |
| static Handle compute_method_handle_type(symbolHandle signature, |
| Handle class_loader, |
| Handle protection_domain, |
| TRAPS); |
| // ask Java to create a dynamic call site, while linking an invokedynamic op |
| static Handle make_dynamic_call_site(KlassHandle caller, |
| int caller_method_idnum, |
| int caller_bci, |
| symbolHandle name, |
| methodHandle mh_invoke, |
| TRAPS); |
| |
| // coordinate with Java about bootstrap methods |
| static Handle find_bootstrap_method(KlassHandle caller, |
| // This argument is non-null only when a |
| // classfile attribute has been found: |
| KlassHandle search_bootstrap_klass, |
| 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() ); |
| } |
| |
| // 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, symbolHandle error); |
| static symbolOop find_resolution_error(constantPoolHandle pool, int which); |
| |
| private: |
| |
| 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 |
| }; |
| |
| |
| // Static variables |
| |
| // 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 klassOop try_get_next_class(); |
| |
| private: |
| 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 klassOop resolve_instance_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| static klassOop resolve_array_class_or_null(symbolHandle class_name, Handle class_loader, Handle protection_domain, TRAPS); |
| static instanceKlassHandle handle_parallel_super_load(symbolHandle class_name, symbolHandle 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(symbolHandle class_name, |
| Handle class_loader, |
| instanceKlassHandle k, TRAPS); |
| static instanceKlassHandle load_shared_class(symbolHandle class_name, |
| Handle class_loader, TRAPS); |
| static instanceKlassHandle load_shared_class(instanceKlassHandle ik, |
| Handle class_loader, TRAPS); |
| static instanceKlassHandle load_instance_class(symbolHandle 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 klassOop find_shared_class(symbolHandle class_name); |
| |
| // Setup link to hierarchy |
| static void add_to_hierarchy(instanceKlassHandle k, TRAPS); |
| |
| private: |
| // We pass in the hashtable index so we can calculate it outside of |
| // the SystemDictionary_lock. |
| |
| // Basic find on loaded classes |
| static klassOop find_class(int index, unsigned int hash, |
| symbolHandle name, Handle loader); |
| |
| // Basic find on classes in the midst of being loaded |
| static symbolOop find_placeholder(int index, unsigned int hash, |
| symbolHandle name, Handle loader); |
| |
| // Basic find operation of loaded classes and classes in the midst |
| // of loading; used for assertions and verification only. |
| static oop find_class_or_placeholder(symbolHandle class_name, |
| Handle class_loader); |
| |
| // Updating entry in dictionary |
| // Add a completely loaded class |
| static void add_klass(int index, symbolHandle class_name, |
| Handle class_loader, KlassHandle obj); |
| |
| // Add a placeholder for a class being loaded |
| static void add_placeholder(int index, |
| symbolHandle class_name, |
| Handle class_loader); |
| static void remove_placeholder(int index, |
| symbolHandle class_name, |
| Handle class_loader); |
| |
| // 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(symbolHandle class_name, |
| Handle class_loader, |
| 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 klassOop _well_known_klasses[]; |
| |
| // Lazily loaded klasses |
| static volatile klassOop _abstract_ownable_synchronizer_klass; |
| |
| // table of box klasses (int_klass, etc.) |
| static klassOop _box_klasses[T_VOID+1]; |
| |
| static oop _java_system_loader; |
| |
| static bool _has_loadClassInternal; |
| static bool _has_checkPackageAccess; |
| }; |
| |
| // Cf. vmSymbols vs. vmSymbolHandles |
| class SystemDictionaryHandles : AllStatic { |
| public: |
| #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \ |
| static KlassHandle name() { \ |
| SystemDictionary::name(); \ |
| klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
| return KlassHandle(loc, true); \ |
| } |
| WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE); |
| #undef WK_KLASS_HANDLE_DECLARE |
| |
| static KlassHandle box_klass(BasicType t); |
| }; |
