| /* |
| * 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 <MEMFLAGS F> class HashtableBucket; |
| class ResolutionErrorTable; |
| class SymbolPropertyTable; |
| class ProtectionDomainCacheTable; |
| class ProtectionDomainCacheEntry; |
| class GCTimer; |
| class OopStorage; |
| |
| // 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 resolve_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(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(Module_klass, java_lang_Module, 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, reflect_MagicAccessorImpl, Opt ) \ |
| do_klass(reflect_MethodAccessorImpl_klass, reflect_MethodAccessorImpl, Pre ) \ |
| do_klass(reflect_ConstructorAccessorImpl_klass, reflect_ConstructorAccessorImpl, Pre ) \ |
| do_klass(reflect_DelegatingClassLoader_klass, reflect_DelegatingClassLoader, Opt ) \ |
| do_klass(reflect_ConstantPool_klass, reflect_ConstantPool, Opt ) \ |
| do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl, Opt ) \ |
| do_klass(reflect_CallerSensitive_klass, 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(VarHandle_klass, java_lang_invoke_VarHandle, Pre ) \ |
| do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \ |
| do_klass(ResolvedMethodName_klass, java_lang_invoke_ResolvedMethodName, 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(Context_klass, java_lang_invoke_MethodHandleNatives_CallSiteContext, 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(AssertionStatusDirectives_klass, java_lang_AssertionStatusDirectives, Pre ) \ |
| do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \ |
| do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \ |
| do_klass(internal_Unsafe_klass, jdk_internal_misc_Unsafe, Pre ) \ |
| do_klass(module_Modules_klass, jdk_internal_module_Modules, Pre ) \ |
| \ |
| /* support for CDS */ \ |
| do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \ |
| do_klass(URL_klass, java_net_URL, Pre ) \ |
| do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \ |
| do_klass(jdk_internal_loader_ClassLoaders_klass, jdk_internal_loader_ClassLoaders, Pre ) \ |
| do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass, jdk_internal_loader_ClassLoaders_AppClassLoader, Pre ) \ |
| do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader, Pre ) \ |
| do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \ |
| \ |
| 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 ) \ |
| \ |
| /* Stack Walking */ \ |
| do_klass(StackWalker_klass, java_lang_StackWalker, Opt ) \ |
| do_klass(AbstractStackWalker_klass, java_lang_StackStreamFactory_AbstractStackWalker, Opt ) \ |
| do_klass(StackFrameInfo_klass, java_lang_StackFrameInfo, Opt ) \ |
| do_klass(LiveStackFrameInfo_klass, java_lang_LiveStackFrameInfo, Opt ) \ |
| \ |
| /* support for stack dump lock analysis */ \ |
| do_klass(java_util_concurrent_locks_AbstractOwnableSynchronizer_klass, java_util_concurrent_locks_AbstractOwnableSynchronizer, Pre ) \ |
| \ |
| /* 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 ) \ |
| \ |
| /* 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, 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, |
| |
| #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 |
| }; |
| |
| 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 |
| #if INCLUDE_JVMCI |
| Jvmci, // preload tried; error if not present if JVMCI enabled |
| #endif |
| 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, 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<Handle>* 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; } |
| |
| 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<mtClass>* 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 commonly used classes - mostly preloaded |
| static InstanceKlass* check_klass(InstanceKlass* k) { |
| assert(k != NULL, "klass not loaded"); |
| return k; |
| } |
| |
| static InstanceKlass* check_klass_Pre(InstanceKlass* k) { return check_klass(k); } |
| static InstanceKlass* check_klass_Opt(InstanceKlass* k) { return k; } |
| |
| JVMCI_ONLY(static InstanceKlass* check_klass_Jvmci(InstanceKlass* k) { return k; }) |
| |
| static bool resolve_wk_klass(WKID id, int init_opt, 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, option) \ |
| static InstanceKlass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ |
| static InstanceKlass** name##_addr() { \ |
| return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \ |
| } |
| 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 |
| |
| 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_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 InstanceKlass* load_shared_class(Symbol* class_name, |
| Handle class_loader, |
| TRAPS); |
| 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 preloaded classes so they can be used like SystemDictionary::String_klass() |
| static void resolve_preloaded_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); |
| |
| // Variables holding commonly used klasses (preloaded) |
| 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 |
