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src/share/vm/classfile/systemDictionary.hpp@ac27a9c85bea (annotated)

src/share/vm/classfile/systemDictionary.hpp

Thu, 24 May 2018 18:41:44 +0800

author

aoqi

date

Thu, 24 May 2018 18:41:44 +0800

changeset 8856

ac27a9c85bea

parent 7535

7ae4e26cb1e0

child 9122

024be04bb151

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
aoqi@0	26	#define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
aoqi@0	27
aoqi@0	28	#include "classfile/classFileStream.hpp"
aoqi@0	29	#include "classfile/classLoader.hpp"
aoqi@0	30	#include "oops/objArrayOop.hpp"
aoqi@0	31	#include "oops/symbol.hpp"
aoqi@0	32	#include "runtime/java.hpp"
aoqi@0	33	#include "runtime/reflectionUtils.hpp"
aoqi@0	34	#include "utilities/hashtable.hpp"
aoqi@0	35	#include "utilities/hashtable.inline.hpp"
aoqi@0	36
aoqi@0	37
aoqi@0	38	// The system dictionary stores all loaded classes and maps:
aoqi@0	39	//
aoqi@0	40	// [class name,class loader] -> class i.e. [Symbol*,oop] -> Klass*
aoqi@0	41	//
aoqi@0	42	// Classes are loaded lazily. The default VM class loader is
aoqi@0	43	// represented as NULL.
aoqi@0	44
aoqi@0	45	// The underlying data structure is an open hash table with a fixed number
aoqi@0	46	// of buckets. During loading the loader object is locked, (for the VM loader
aoqi@0	47	// a private lock object is used). Class loading can thus be done concurrently,
aoqi@0	48	// but only by different loaders.
aoqi@0	49	//
aoqi@0	50	// During loading a placeholder (name, loader) is temporarily placed in
aoqi@0	51	// a side data structure, and is used to detect ClassCircularityErrors
aoqi@0	52	// and to perform verification during GC. A GC can occur in the midst
aoqi@0	53	// of class loading, as we call out to Java, have to take locks, etc.
aoqi@0	54	//
aoqi@0	55	// When class loading is finished, a new entry is added to the system
aoqi@0	56	// dictionary and the place holder is removed. Note that the protection
aoqi@0	57	// domain field of the system dictionary has not yet been filled in when
aoqi@0	58	// the "real" system dictionary entry is created.
aoqi@0	59	//
aoqi@0	60	// Clients of this class who are interested in finding if a class has
aoqi@0	61	// been completely loaded -- not classes in the process of being loaded --
aoqi@0	62	// can read the SystemDictionary unlocked. This is safe because
aoqi@0	63	// - entries are only deleted at safepoints
aoqi@0	64	// - readers cannot come to a safepoint while actively examining
aoqi@0	65	// an entry (an entry cannot be deleted from under a reader)
aoqi@0	66	// - entries must be fully formed before they are available to concurrent
aoqi@0	67	// readers (we must ensure write ordering)
aoqi@0	68	//
aoqi@0	69	// Note that placeholders are deleted at any time, as they are removed
aoqi@0	70	// when a class is completely loaded. Therefore, readers as well as writers
aoqi@0	71	// of placeholders must hold the SystemDictionary_lock.
aoqi@0	72	//
aoqi@0	73
aoqi@0	74	class Dictionary;
aoqi@0	75	class PlaceholderTable;
aoqi@0	76	class LoaderConstraintTable;
aoqi@0	77	template <MEMFLAGS F> class HashtableBucket;
aoqi@0	78	class ResolutionErrorTable;
aoqi@0	79	class SymbolPropertyTable;
aoqi@0	80	class Ticks;
aoqi@0	81
aoqi@0	82	// Certain classes are preloaded, such as java.lang.Object and java.lang.String.
aoqi@0	83	// They are all "well-known", in the sense that no class loader is allowed
aoqi@0	84	// to provide a different definition.
aoqi@0	85	//
aoqi@0	86	// These klasses must all have names defined in vmSymbols.
aoqi@0	87
aoqi@0	88	#define WK_KLASS_ENUM_NAME(kname) kname##_knum
aoqi@0	89
aoqi@0	90	// Each well-known class has a short klass name (like object_klass),
aoqi@0	91	// a vmSymbol name (like java_lang_Object), and a flag word
aoqi@0	92	// that makes some minor distinctions, like whether the klass
aoqi@0	93	// is preloaded, optional, release-specific, etc.
aoqi@0	94	// The order of these definitions is significant; it is the order in which
aoqi@0	95	// preloading is actually performed by initialize_preloaded_classes.
aoqi@0	96
aoqi@0	97	#define WK_KLASSES_DO(do_klass) \
aoqi@0	98	/* well-known classes */ \
aoqi@0	99	do_klass(Object_klass, java_lang_Object, Pre ) \
aoqi@0	100	do_klass(String_klass, java_lang_String, Pre ) \
aoqi@0	101	do_klass(Class_klass, java_lang_Class, Pre ) \
aoqi@0	102	do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \
aoqi@0	103	do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \
aoqi@0	104	do_klass(Serializable_klass, java_io_Serializable, Pre ) \
aoqi@0	105	do_klass(System_klass, java_lang_System, Pre ) \
aoqi@0	106	do_klass(Throwable_klass, java_lang_Throwable, Pre ) \
aoqi@0	107	do_klass(Error_klass, java_lang_Error, Pre ) \
aoqi@0	108	do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \
aoqi@0	109	do_klass(Exception_klass, java_lang_Exception, Pre ) \
aoqi@0	110	do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \
aoqi@0	111	do_klass(SecurityManager_klass, java_lang_SecurityManager, Pre ) \
aoqi@0	112	do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \
aoqi@0	113	do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \
iklam@7089	114	do_klass(SecureClassLoader_klass, java_security_SecureClassLoader, Pre ) \
aoqi@0	115	do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
aoqi@0	116	do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
aoqi@0	117	do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
aoqi@0	118	do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
aoqi@0	119	do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
aoqi@0	120	do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
aoqi@0	121	do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
aoqi@0	122	do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
aoqi@0	123	do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
aoqi@0	124	do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
aoqi@0	125	\
aoqi@0	126	/* Preload ref klasses and set reference types */ \
aoqi@0	127	do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
aoqi@0	128	do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
aoqi@0	129	do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
aoqi@0	130	do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
jmasa@7469	131	do_klass(Cleaner_klass, sun_misc_Cleaner, Pre ) \
aoqi@0	132	do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
aoqi@0	133	\
aoqi@0	134	do_klass(Thread_klass, java_lang_Thread, Pre ) \
aoqi@0	135	do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
aoqi@0	136	do_klass(Properties_klass, java_util_Properties, Pre ) \
aoqi@0	137	do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
aoqi@0	138	do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
aoqi@0	139	do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \
aoqi@0	140	do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
aoqi@0	141	do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
aoqi@0	142	\
aoqi@0	143	/* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
aoqi@0	144	/* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
aoqi@0	145	/* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
aoqi@0	146	do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
aoqi@0	147	do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
aoqi@0	148	do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
aoqi@0	149	do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
aoqi@0	150	do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
aoqi@0	151	do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
aoqi@0	152	do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \
aoqi@0	153	\
aoqi@0	154	/* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
aoqi@0	155	do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \
aoqi@0	156	do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
aoqi@0	157	do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
aoqi@0	158	do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
aoqi@0	159	do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
aoqi@0	160	do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
aoqi@0	161	do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
aoqi@0	162	do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
aoqi@0	163	do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
aoqi@0	164	do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
aoqi@0	165	do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
aoqi@0	166	/* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
aoqi@0	167	\
aoqi@0	168	do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
aoqi@0	169	do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
aoqi@0	170	do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \
aoqi@0	171	\
iklam@7089	172	/* support for CDS */ \
iklam@7089	173	do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream, Pre ) \
iklam@7089	174	do_klass(File_klass, java_io_File, Pre ) \
iklam@7089	175	do_klass(URLClassLoader_klass, java_net_URLClassLoader, Pre ) \
iklam@7089	176	do_klass(URL_klass, java_net_URL, Pre ) \
iklam@7089	177	do_klass(Jar_Manifest_klass, java_util_jar_Manifest, Pre ) \
iklam@7089	178	do_klass(sun_misc_Launcher_klass, sun_misc_Launcher, Pre ) \
iklam@7322	179	do_klass(sun_misc_Launcher_AppClassLoader_klass, sun_misc_Launcher_AppClassLoader, Pre ) \
iklam@7322	180	do_klass(sun_misc_Launcher_ExtClassLoader_klass, sun_misc_Launcher_ExtClassLoader, Pre ) \
iklam@7089	181	do_klass(CodeSource_klass, java_security_CodeSource, Pre ) \
iklam@7089	182	\
aoqi@0	183	/* It's NULL in non-1.4 JDKs. */ \
aoqi@0	184	do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
aoqi@0	185	/* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
aoqi@0	186	/* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
aoqi@0	187	do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
aoqi@0	188	\
aoqi@0	189	/* Preload boxing klasses */ \
aoqi@0	190	do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
aoqi@0	191	do_klass(Character_klass, java_lang_Character, Pre ) \
aoqi@0	192	do_klass(Float_klass, java_lang_Float, Pre ) \
aoqi@0	193	do_klass(Double_klass, java_lang_Double, Pre ) \
aoqi@0	194	do_klass(Byte_klass, java_lang_Byte, Pre ) \
aoqi@0	195	do_klass(Short_klass, java_lang_Short, Pre ) \
aoqi@0	196	do_klass(Integer_klass, java_lang_Integer, Pre ) \
aoqi@0	197	do_klass(Long_klass, java_lang_Long, Pre ) \
aoqi@0	198	/*end*/
aoqi@0	199
aoqi@0	200
aoqi@0	201	class SystemDictionary : AllStatic {
aoqi@0	202	friend class VMStructs;
aoqi@0	203	friend class SystemDictionaryHandles;
aoqi@0	204
aoqi@0	205	public:
aoqi@0	206	enum WKID {
aoqi@0	207	NO_WKID = 0,
aoqi@0	208
aoqi@0	209	#define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
aoqi@0	210	WK_KLASSES_DO(WK_KLASS_ENUM)
aoqi@0	211	#undef WK_KLASS_ENUM
aoqi@0	212
aoqi@0	213	WKID_LIMIT,
aoqi@0	214
aoqi@0	215	FIRST_WKID = NO_WKID + 1
aoqi@0	216	};
aoqi@0	217
aoqi@0	218	enum InitOption {
aoqi@0	219	Pre, // preloaded; error if not present
aoqi@0	220	Pre_JSR292, // preloaded if EnableInvokeDynamic
aoqi@0	221
aoqi@0	222	// Order is significant. Options before this point require resolve_or_fail.
aoqi@0	223	// Options after this point will use resolve_or_null instead.
aoqi@0	224
aoqi@0	225	Opt, // preload tried; NULL if not present
aoqi@0	226	Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
aoqi@0	227	Opt_Only_JDK15, // preload tried; use only with JDK1.5+
aoqi@0	228	OPTION_LIMIT,
aoqi@0	229	CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
aoqi@0	230	};
aoqi@0	231
aoqi@0	232
aoqi@0	233	// Returns a class with a given class name and class loader. Loads the
aoqi@0	234	// class if needed. If not found a NoClassDefFoundError or a
aoqi@0	235	// ClassNotFoundException is thrown, depending on the value on the
aoqi@0	236	// throw_error flag. For most uses the throw_error argument should be set
aoqi@0	237	// to true.
aoqi@0	238
aoqi@0	239	static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
aoqi@0	240	// Convenient call for null loader and protection domain.
aoqi@0	241	static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
iklam@7089	242	protected:
aoqi@0	243	// handle error translation for resolve_or_null results
aoqi@0	244	static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
aoqi@0	245
aoqi@0	246	public:
aoqi@0	247
aoqi@0	248	// Returns a class with a given class name and class loader.
aoqi@0	249	// Loads the class if needed. If not found NULL is returned.
aoqi@0	250	static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	251	// Version with null loader and protection domain
aoqi@0	252	static Klass* resolve_or_null(Symbol* class_name, TRAPS);
aoqi@0	253
aoqi@0	254	// Resolve a superclass or superinterface. Called from ClassFileParser,
aoqi@0	255	// parse_interfaces, resolve_instance_class_or_null, load_shared_class
aoqi@0	256	// "child_name" is the class whose super class or interface is being resolved.
aoqi@0	257	static Klass* resolve_super_or_fail(Symbol* child_name,
aoqi@0	258	Symbol* class_name,
aoqi@0	259	Handle class_loader,
aoqi@0	260	Handle protection_domain,
aoqi@0	261	bool is_superclass,
aoqi@0	262	TRAPS);
aoqi@0	263
aoqi@0	264	// Parse new stream. This won't update the system dictionary or
aoqi@0	265	// class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
aoqi@0	266	static Klass* parse_stream(Symbol* class_name,
aoqi@0	267	Handle class_loader,
aoqi@0	268	Handle protection_domain,
aoqi@0	269	ClassFileStream* st,
aoqi@0	270	TRAPS) {
aoqi@0	271	KlassHandle nullHandle;
aoqi@0	272	return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
aoqi@0	273	}
aoqi@0	274	static Klass* parse_stream(Symbol* class_name,
aoqi@0	275	Handle class_loader,
aoqi@0	276	Handle protection_domain,
aoqi@0	277	ClassFileStream* st,
aoqi@0	278	KlassHandle host_klass,
aoqi@0	279	GrowableArray<Handle>* cp_patches,
aoqi@0	280	TRAPS);
aoqi@0	281
aoqi@0	282	// Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
aoqi@0	283	static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
aoqi@0	284	Handle protection_domain,
aoqi@0	285	ClassFileStream* st, bool verify, TRAPS);
aoqi@0	286
aoqi@0	287	// Lookup an already loaded class. If not found NULL is returned.
aoqi@0	288	static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	289
aoqi@0	290	// Lookup an already loaded instance or array class.
aoqi@0	291	// Do not make any queries to class loaders; consult only the cache.
aoqi@0	292	// If not found NULL is returned.
aoqi@0	293	static Klass* find_instance_or_array_klass(Symbol* class_name,
aoqi@0	294	Handle class_loader,
aoqi@0	295	Handle protection_domain,
aoqi@0	296	TRAPS);
aoqi@0	297
aoqi@0	298	// Lookup an instance or array class that has already been loaded
aoqi@0	299	// either into the given class loader, or else into another class
aoqi@0	300	// loader that is constrained (via loader constraints) to produce
aoqi@0	301	// a consistent class. Do not take protection domains into account.
aoqi@0	302	// Do not make any queries to class loaders; consult only the cache.
aoqi@0	303	// Return NULL if the class is not found.
aoqi@0	304	//
aoqi@0	305	// This function is a strict superset of find_instance_or_array_klass.
aoqi@0	306	// This function (the unchecked version) makes a conservative prediction
aoqi@0	307	// of the result of the checked version, assuming successful lookup.
aoqi@0	308	// If both functions return non-null, they must return the same value.
aoqi@0	309	// Also, the unchecked version may sometimes be non-null where the
aoqi@0	310	// checked version is null. This can occur in several ways:
aoqi@0	311	// 1. No query has yet been made to the class loader.
aoqi@0	312	// 2. The class loader was queried, but chose not to delegate.
aoqi@0	313	// 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
aoqi@0	314	// 4. Loading was attempted, but there was a linkage error of some sort.
aoqi@0	315	// In all of these cases, the loader constraints on this type are
aoqi@0	316	// satisfied, and it is safe for classes in the given class loader
aoqi@0	317	// to manipulate strongly-typed values of the found class, subject
aoqi@0	318	// to local linkage and access checks.
aoqi@0	319	static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
aoqi@0	320	Handle class_loader,
aoqi@0	321	TRAPS);
aoqi@0	322
aoqi@0	323	// Iterate over all klasses in dictionary
aoqi@0	324	// Just the classes from defining class loaders
aoqi@0	325	static void classes_do(void f(Klass*));
aoqi@0	326	// Added for initialize_itable_for_klass to handle exceptions
aoqi@0	327	static void classes_do(void f(Klass*, TRAPS), TRAPS);
aoqi@0	328	// All classes, and their class loaders
aoqi@0	329	static void classes_do(void f(Klass*, ClassLoaderData*));
aoqi@0	330
aoqi@0	331	static void placeholders_do(void f(Symbol*));
aoqi@0	332
aoqi@0	333	// Iterate over all methods in all klasses in dictionary
aoqi@0	334	static void methods_do(void f(Method*));
aoqi@0	335
aoqi@0	336	// Garbage collection support
aoqi@0	337
aoqi@0	338	// This method applies "blk->do_oop" to all the pointers to "system"
aoqi@0	339	// classes and loaders.
aoqi@0	340	static void always_strong_oops_do(OopClosure* blk);
aoqi@0	341	static void always_strong_classes_do(KlassClosure* closure);
aoqi@0	342
aoqi@0	343	// Unload (that is, break root links to) all unmarked classes and
aoqi@0	344	// loaders. Returns "true" iff something was unloaded.
stefank@7333	345	static bool do_unloading(BoolObjectClosure* is_alive, bool clean_alive = true);
coleenp@6626	346
iklam@7089	347	// Used by DumpSharedSpaces only to remove classes that failed verification
iklam@7089	348	static void remove_classes_in_error_state();
aoqi@0	349
aoqi@0	350	static int calculate_systemdictionary_size(int loadedclasses);
aoqi@0	351
aoqi@0	352	// Applies "f->do_oop" to all root oops in the system dictionary.
aoqi@0	353	static void oops_do(OopClosure* f);
stefank@6992	354	static void roots_oops_do(OopClosure* strong, OopClosure* weak);
aoqi@0	355
aoqi@0	356	// System loader lock
aoqi@0	357	static oop system_loader_lock() { return _system_loader_lock_obj; }
aoqi@0	358
iklam@7089	359	protected:
aoqi@0	360	// Extended Redefine classes support (tbi)
aoqi@0	361	static void preloaded_classes_do(KlassClosure* f);
aoqi@0	362	static void lazily_loaded_classes_do(KlassClosure* f);
aoqi@0	363	public:
aoqi@0	364	// Sharing support.
aoqi@0	365	static void reorder_dictionary();
aoqi@0	366	static void copy_buckets(char** top, char* end);
aoqi@0	367	static void copy_table(char** top, char* end);
aoqi@0	368	static void reverse();
aoqi@0	369	static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
aoqi@0	370	int number_of_entries);
aoqi@0	371	// Printing
iklam@7089	372	static void print(bool details = true);
iklam@7089	373	static void print_shared(bool details = true);
aoqi@0	374	static void print_class_statistics() PRODUCT_RETURN;
aoqi@0	375	static void print_method_statistics() PRODUCT_RETURN;
aoqi@0	376
aoqi@0	377	// Number of contained klasses
aoqi@0	378	// This is both fully loaded classes and classes in the process
aoqi@0	379	// of being loaded
aoqi@0	380	static int number_of_classes();
aoqi@0	381
aoqi@0	382	// Monotonically increasing counter which grows as classes are
aoqi@0	383	// loaded or modifications such as hot-swapping or setting/removing
aoqi@0	384	// of breakpoints are performed
aoqi@0	385	static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
aoqi@0	386	// Needed by evolution and breakpoint code
aoqi@0	387	static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
aoqi@0	388
aoqi@0	389	// Verification
aoqi@0	390	static void verify();
aoqi@0	391
aoqi@0	392	#ifdef ASSERT
aoqi@0	393	static bool is_internal_format(Symbol* class_name);
aoqi@0	394	#endif
aoqi@0	395
aoqi@0	396	// Initialization
aoqi@0	397	static void initialize(TRAPS);
aoqi@0	398
aoqi@0	399	// Fast access to commonly used classes (preloaded)
aoqi@0	400	static Klass* check_klass(Klass* k) {
aoqi@0	401	assert(k != NULL, "preloaded klass not initialized");
aoqi@0	402	return k;
aoqi@0	403	}
aoqi@0	404
aoqi@0	405	static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
aoqi@0	406	static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
aoqi@0	407	static Klass* check_klass_Opt( Klass* k) { return k; }
aoqi@0	408	static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
aoqi@0	409	assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
aoqi@0	410	return k;
aoqi@0	411	}
aoqi@0	412	static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
aoqi@0	413	assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
aoqi@0	414	// despite the optional loading, if you use this it must be present:
aoqi@0	415	return check_klass(k);
aoqi@0	416	}
aoqi@0	417
aoqi@0	418	static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
aoqi@0	419	static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
aoqi@0	420	static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
aoqi@0	421	int limit = (int)end_id + 1;
aoqi@0	422	initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
aoqi@0	423	}
aoqi@0	424
aoqi@0	425	public:
aoqi@0	426	#define WK_KLASS_DECLARE(name, symbol, option) \
aoqi@0	427	static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
aoqi@0	428	static Klass** name##_addr() { \
aoqi@0	429	return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
aoqi@0	430	}
aoqi@0	431	WK_KLASSES_DO(WK_KLASS_DECLARE);
aoqi@0	432	#undef WK_KLASS_DECLARE
aoqi@0	433
aoqi@0	434	static Klass* well_known_klass(WKID id) {
aoqi@0	435	assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
aoqi@0	436	return _well_known_klasses[id];
aoqi@0	437	}
aoqi@0	438
aoqi@0	439	static Klass** well_known_klass_addr(WKID id) {
aoqi@0	440	assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
aoqi@0	441	return &_well_known_klasses[id];
aoqi@0	442	}
aoqi@0	443
aoqi@0	444	// Local definition for direct access to the private array:
aoqi@0	445	#define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
aoqi@0	446
aoqi@0	447	static Klass* box_klass(BasicType t) {
aoqi@0	448	assert((uint)t < T_VOID+1, "range check");
aoqi@0	449	return check_klass(_box_klasses[t]);
aoqi@0	450	}
aoqi@0	451	static BasicType box_klass_type(Klass* k); // inverse of box_klass
aoqi@0	452
aoqi@0	453	// methods returning lazily loaded klasses
aoqi@0	454	// The corresponding method to load the class must be called before calling them.
aoqi@0	455	static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
aoqi@0	456
aoqi@0	457	static void load_abstract_ownable_synchronizer_klass(TRAPS);
aoqi@0	458
iklam@7089	459	protected:
aoqi@0	460	// Tells whether ClassLoader.loadClassInternal is present
aoqi@0	461	static bool has_loadClassInternal() { return _has_loadClassInternal; }
aoqi@0	462
aoqi@0	463	// Returns the class loader data to be used when looking up/updating the
aoqi@0	464	// system dictionary.
aoqi@0	465	static ClassLoaderData *class_loader_data(Handle class_loader) {
aoqi@0	466	return ClassLoaderData::class_loader_data(class_loader());
aoqi@0	467	}
aoqi@0	468
aoqi@0	469	public:
aoqi@0	470	// Tells whether ClassLoader.checkPackageAccess is present
aoqi@0	471	static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
aoqi@0	472
aoqi@0	473	static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
aoqi@0	474	static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
aoqi@0	475	static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
aoqi@0	476	static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
aoqi@0	477	static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
aoqi@0	478
aoqi@0	479	// Returns default system loader
aoqi@0	480	static oop java_system_loader();
aoqi@0	481
aoqi@0	482	// Compute the default system loader
aoqi@0	483	static void compute_java_system_loader(TRAPS);
aoqi@0	484
aoqi@0	485	// Register a new class loader
aoqi@0	486	static ClassLoaderData* register_loader(Handle class_loader, TRAPS);
iklam@7089	487	protected:
aoqi@0	488	// Mirrors for primitive classes (created eagerly)
aoqi@0	489	static oop check_mirror(oop m) {
aoqi@0	490	assert(m != NULL, "mirror not initialized");
aoqi@0	491	return m;
aoqi@0	492	}
aoqi@0	493
aoqi@0	494	public:
aoqi@0	495	// Note: java_lang_Class::primitive_type is the inverse of java_mirror
aoqi@0	496
aoqi@0	497	// Check class loader constraints
aoqi@0	498	static bool add_loader_constraint(Symbol* name, Handle loader1,
aoqi@0	499	Handle loader2, TRAPS);
aoqi@0	500	static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
aoqi@0	501	Handle loader2, bool is_method, TRAPS);
aoqi@0	502
aoqi@0	503	// JSR 292
aoqi@0	504	// find a java.lang.invoke.MethodHandle.invoke* method for a given signature
aoqi@0	505	// (asks Java to compute it if necessary, except in a compiler thread)
aoqi@0	506	static methodHandle find_method_handle_invoker(Symbol* name,
aoqi@0	507	Symbol* signature,
aoqi@0	508	KlassHandle accessing_klass,
aoqi@0	509	Handle *appendix_result,
aoqi@0	510	Handle *method_type_result,
aoqi@0	511	TRAPS);
aoqi@0	512	// for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
aoqi@0	513	// (does not ask Java, since this is a low-level intrinsic defined by the JVM)
aoqi@0	514	static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
aoqi@0	515	Symbol* signature,
aoqi@0	516	TRAPS);
aoqi@0	517	// find a java.lang.invoke.MethodType object for a given signature
aoqi@0	518	// (asks Java to compute it if necessary, except in a compiler thread)
aoqi@0	519	static Handle find_method_handle_type(Symbol* signature,
aoqi@0	520	KlassHandle accessing_klass,
aoqi@0	521	TRAPS);
aoqi@0	522
aoqi@0	523	// ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
aoqi@0	524	static Handle link_method_handle_constant(KlassHandle caller,
aoqi@0	525	int ref_kind, //e.g., JVM_REF_invokeVirtual
aoqi@0	526	KlassHandle callee,
aoqi@0	527	Symbol* name,
aoqi@0	528	Symbol* signature,
aoqi@0	529	TRAPS);
aoqi@0	530
aoqi@0	531	// ask Java to create a dynamic call site, while linking an invokedynamic op
aoqi@0	532	static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
aoqi@0	533	Handle bootstrap_method,
aoqi@0	534	Symbol* name,
aoqi@0	535	Symbol* type,
aoqi@0	536	Handle *appendix_result,
aoqi@0	537	Handle *method_type_result,
aoqi@0	538	TRAPS);
aoqi@0	539
aoqi@0	540	// Utility for printing loader "name" as part of tracing constraints
aoqi@0	541	static const char* loader_name(oop loader) {
aoqi@0	542	return ((loader) == NULL ? "<bootloader>" :
aoqi@0	543	InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
aoqi@0	544	}
aoqi@0	545	static const char* loader_name(ClassLoaderData* loader_data) {
aoqi@0	546	return (loader_data->class_loader() == NULL ? "<bootloader>" :
aoqi@0	547	InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
aoqi@0	548	}
aoqi@0	549
aoqi@0	550	// Record the error when the first attempt to resolve a reference from a constant
aoqi@0	551	// pool entry to a class fails.
aoqi@0	552	static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
aoqi@0	553	static void delete_resolution_error(ConstantPool* pool);
aoqi@0	554	static Symbol* find_resolution_error(constantPoolHandle pool, int which);
aoqi@0	555
iklam@7089	556	protected:
aoqi@0	557
aoqi@0	558	enum Constants {
aoqi@0	559	_loader_constraint_size = 107, // number of entries in constraint table
aoqi@0	560	_resolution_error_size = 107, // number of entries in resolution error table
aoqi@0	561	_invoke_method_size = 139, // number of entries in invoke method table
aoqi@0	562	_nof_buckets = 1009, // number of buckets in hash table for placeholders
aoqi@0	563	_old_default_sdsize = 1009, // backward compat for system dictionary size
aoqi@0	564	_prime_array_size = 8, // array of primes for system dictionary size
aoqi@0	565	_average_depth_goal = 3 // goal for lookup length
aoqi@0	566	};
aoqi@0	567
aoqi@0	568
aoqi@0	569	// Static variables
aoqi@0	570
aoqi@0	571	// hashtable sizes for system dictionary to allow growth
aoqi@0	572	// prime numbers for system dictionary size
aoqi@0	573	static int _sdgeneration;
aoqi@0	574	static const int _primelist[_prime_array_size];
aoqi@0	575
aoqi@0	576	// Hashtable holding loaded classes.
aoqi@0	577	static Dictionary* _dictionary;
aoqi@0	578
aoqi@0	579	// Hashtable holding placeholders for classes being loaded.
aoqi@0	580	static PlaceholderTable* _placeholders;
aoqi@0	581
aoqi@0	582	// Hashtable holding classes from the shared archive.
aoqi@0	583	static Dictionary* _shared_dictionary;
aoqi@0	584
aoqi@0	585	// Monotonically increasing counter which grows with
aoqi@0	586	// _number_of_classes as well as hot-swapping and breakpoint setting
aoqi@0	587	// and removal.
aoqi@0	588	static int _number_of_modifications;
aoqi@0	589
aoqi@0	590	// Lock object for system class loader
aoqi@0	591	static oop _system_loader_lock_obj;
aoqi@0	592
aoqi@0	593	// Constraints on class loaders
aoqi@0	594	static LoaderConstraintTable* _loader_constraints;
aoqi@0	595
aoqi@0	596	// Resolution errors
aoqi@0	597	static ResolutionErrorTable* _resolution_errors;
aoqi@0	598
aoqi@0	599	// Invoke methods (JSR 292)
aoqi@0	600	static SymbolPropertyTable* _invoke_method_table;
aoqi@0	601
aoqi@0	602	public:
aoqi@0	603	// for VM_CounterDecay iteration support
aoqi@0	604	friend class CounterDecay;
aoqi@0	605	static Klass* try_get_next_class();
aoqi@0	606
iklam@7089	607	protected:
aoqi@0	608	static void validate_protection_domain(instanceKlassHandle klass,
aoqi@0	609	Handle class_loader,
aoqi@0	610	Handle protection_domain, TRAPS);
aoqi@0	611
aoqi@0	612	friend class VM_PopulateDumpSharedSpace;
aoqi@0	613	friend class TraversePlaceholdersClosure;
aoqi@0	614	static Dictionary* dictionary() { return _dictionary; }
aoqi@0	615	static Dictionary* shared_dictionary() { return _shared_dictionary; }
aoqi@0	616	static PlaceholderTable* placeholders() { return _placeholders; }
aoqi@0	617	static LoaderConstraintTable* constraints() { return _loader_constraints; }
aoqi@0	618	static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
aoqi@0	619	static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
aoqi@0	620
aoqi@0	621	// Basic loading operations
aoqi@0	622	static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	623	static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	624	static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
aoqi@0	625	// Wait on SystemDictionary_lock; unlocks lockObject before
aoqi@0	626	// waiting; relocks lockObject with correct recursion count
aoqi@0	627	// after waiting, but before reentering SystemDictionary_lock
aoqi@0	628	// to preserve lock order semantics.
aoqi@0	629	static void double_lock_wait(Handle lockObject, TRAPS);
aoqi@0	630	static void define_instance_class(instanceKlassHandle k, TRAPS);
aoqi@0	631	static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
aoqi@0	632	Handle class_loader,
aoqi@0	633	instanceKlassHandle k, TRAPS);
aoqi@0	634	static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
iklam@7089	635	Handle class_loader,
iklam@7089	636	Handle protection_domain,
iklam@7089	637	TRAPS);
aoqi@0	638	static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
aoqi@0	639	static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
aoqi@0	640	static void check_loader_lock_contention(Handle loader_lock, TRAPS);
aoqi@0	641	static bool is_parallelCapable(Handle class_loader);
aoqi@0	642	static bool is_parallelDefine(Handle class_loader);
aoqi@0	643
aoqi@0	644	public:
iklam@7089	645	static instanceKlassHandle load_shared_class(Symbol* class_name,
iklam@7089	646	Handle class_loader,
iklam@7089	647	TRAPS);
aoqi@0	648	static bool is_ext_class_loader(Handle class_loader);
aoqi@0	649
iklam@7089	650	protected:
aoqi@0	651	static Klass* find_shared_class(Symbol* class_name);
aoqi@0	652
aoqi@0	653	// Setup link to hierarchy
aoqi@0	654	static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
aoqi@0	655
aoqi@0	656	// event based tracing
aoqi@0	657	static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
aoqi@0	658	Handle initiating_loader);
aoqi@0	659	// We pass in the hashtable index so we can calculate it outside of
aoqi@0	660	// the SystemDictionary_lock.
aoqi@0	661
aoqi@0	662	// Basic find on loaded classes
aoqi@0	663	static Klass* find_class(int index, unsigned int hash,
aoqi@0	664	Symbol* name, ClassLoaderData* loader_data);
aoqi@0	665	static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
aoqi@0	666
aoqi@0	667	// Basic find on classes in the midst of being loaded
aoqi@0	668	static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
aoqi@0	669
aoqi@0	670	// Updating entry in dictionary
aoqi@0	671	// Add a completely loaded class
aoqi@0	672	static void add_klass(int index, Symbol* class_name,
aoqi@0	673	ClassLoaderData* loader_data, KlassHandle obj);
aoqi@0	674
aoqi@0	675	// Add a placeholder for a class being loaded
aoqi@0	676	static void add_placeholder(int index,
aoqi@0	677	Symbol* class_name,
aoqi@0	678	ClassLoaderData* loader_data);
aoqi@0	679	static void remove_placeholder(int index,
aoqi@0	680	Symbol* class_name,
aoqi@0	681	ClassLoaderData* loader_data);
aoqi@0	682
aoqi@0	683	// Performs cleanups after resolve_super_or_fail. This typically needs
aoqi@0	684	// to be called on failure.
aoqi@0	685	// Won't throw, but can block.
aoqi@0	686	static void resolution_cleanups(Symbol* class_name,
aoqi@0	687	ClassLoaderData* loader_data,
aoqi@0	688	TRAPS);
aoqi@0	689
aoqi@0	690	// Initialization
aoqi@0	691	static void initialize_preloaded_classes(TRAPS);
aoqi@0	692
aoqi@0	693	// Class loader constraints
aoqi@0	694	static void check_constraints(int index, unsigned int hash,
aoqi@0	695	instanceKlassHandle k, Handle loader,
aoqi@0	696	bool defining, TRAPS);
aoqi@0	697	static void update_dictionary(int d_index, unsigned int d_hash,
aoqi@0	698	int p_index, unsigned int p_hash,
aoqi@0	699	instanceKlassHandle k, Handle loader,
aoqi@0	700	TRAPS);
aoqi@0	701
aoqi@0	702	// Variables holding commonly used klasses (preloaded)
aoqi@0	703	static Klass* _well_known_klasses[];
aoqi@0	704
aoqi@0	705	// Lazily loaded klasses
aoqi@0	706	static Klass* volatile _abstract_ownable_synchronizer_klass;
aoqi@0	707
aoqi@0	708	// table of box klasses (int_klass, etc.)
aoqi@0	709	static Klass* _box_klasses[T_VOID+1];
aoqi@0	710
aoqi@0	711	static oop _java_system_loader;
aoqi@0	712
aoqi@0	713	static bool _has_loadClassInternal;
aoqi@0	714	static bool _has_checkPackageAccess;
aoqi@0	715	};
aoqi@0	716
aoqi@0	717	#endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP