| /* |
| * 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 */ \ |
| /* 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. */ \ |
| do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \ |
| do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \ |
| do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \ |
| do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \ |
| do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \ |
| do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ |
| 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_JSR292 ) \ |
| do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \ |
| do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \ |
| do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ |
| do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \ |
| do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \ |
| do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \ |
| do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \ |
| do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \ |
| do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \ |
| /* 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(sun_misc_Launcher_AppClassLoader_klass, sun_misc_Launcher_AppClassLoader, Pre ) \ |
| do_klass(sun_misc_Launcher_ExtClassLoader_klass, sun_misc_Launcher_ExtClassLoader, 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 ) \ |
| /* 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. */ \ |
| 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 |
| Pre_JSR292, // preloaded if EnableInvokeDynamic |
| |
| // 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+ |
| 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 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, 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 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_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; } |
| static Klass* check_klass_Opt( Klass* k) { return k; } |
| static Klass* check_klass_Opt_Only_JDK15(Klass* k) { |
| assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only"); |
| return k; |
| } |
| static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* 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, 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); |
| static void delete_resolution_error(ConstantPool* pool); |
| static Symbol* find_resolution_error(constantPoolHandle pool, int which); |
| |
| 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 |
