--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/systemDictionary.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,708 @@
+/*
+ * Copyright (c) 1997, 2017, 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 "classfile/systemDictionary_ext.hpp"
+#include "jvmci/systemDictionary_jvmci.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 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;
+
+// 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(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(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(File_klass, java_io_File, 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_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(ParseUtil_klass, sun_net_www_ParseUtil, 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 ) \
+ \
+ /* 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 ) \
+ \
+ /* Extensions */ \
+ WK_KLASSES_DO_EXT(do_klass) \
+ /* JVMCI classes. These are loaded on-demand. */ \
+ JVMCI_WK_KLASSES_DO(do_klass) \
+ \
+ /*end*/
+
+
+class SystemDictionary : AllStatic {
+ friend class VMStructs;
+ friend class SystemDictionaryHandles;
+ friend class SharedClassUtil;
+
+ 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 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 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, // host klass
+ NULL, // cp_patches
+ THREAD);
+ }
+ static InstanceKlass* parse_stream(Symbol* class_name,
+ Handle class_loader,
+ Handle protection_domain,
+ ClassFileStream* st,
+ const InstanceKlass* host_klass,
+ 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
+
+ // This method applies "blk->do_oop" to all the pointers to "system"
+ // classes and loaders.
+ static void always_strong_oops_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,
+ 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);
+ static void roots_oops_do(OopClosure* strong, OopClosure* weak);
+
+ // System loader lock
+ static oop system_loader_lock() { return _system_loader_lock_obj; }
+
+public:
+ // Sharing support.
+ static void reorder_dictionary_for_sharing();
+ 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 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 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
+
+ // methods returning lazily loaded klasses
+ // The corresponding method to load the class must be called before calling them.
+ static InstanceKlass* 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(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);
+ // 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);
+
+ // 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 create a dynamic call site, while linking an invokedynamic op
+ static methodHandle find_dynamic_call_site_invoker(Klass* 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(const oop loader);
+ static const char* loader_name(const ClassLoaderData* loader_data);
+
+ // 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;
+
+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 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 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();
+
+protected:
+ static InstanceKlass* find_shared_class(Symbol* class_name);
+
+ // Setup link to hierarchy
+ static void add_to_hierarchy(InstanceKlass* k, TRAPS);
+
+ // We pass in the hashtable index so we can calculate it outside of
+ // the SystemDictionary_lock.
+
+ // Basic find on loaded classes
+ static InstanceKlass* find_class(int index, 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);
+
+ // Initialization
+ static void initialize_preloaded_classes(TRAPS);
+
+ // Class loader constraints
+ static void check_constraints(int index, unsigned int hash,
+ InstanceKlass* k, Handle loader,
+ bool defining, TRAPS);
+ static void update_dictionary(int d_index, 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[];
+
+ // Lazily loaded klasses
+ static InstanceKlass* volatile _abstract_ownable_synchronizer_klass;
+
+ // table of box klasses (int_klass, etc.)
+ static InstanceKlass* _box_klasses[T_VOID+1];
+
+ static oop _java_system_loader;
+
+ static bool _has_loadClassInternal;
+ static bool _has_checkPackageAccess;
+};
+
+#endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP