• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/classfile/systemDictionary.hpp@f90c822e73f8 (annotated)

src/share/vm/classfile/systemDictionary.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

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 ) \
aoqi@0	114	do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
aoqi@0	115	do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
aoqi@0	116	do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
aoqi@0	117	do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
aoqi@0	118	do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
aoqi@0	119	do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
aoqi@0	120	do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
aoqi@0	121	do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
aoqi@0	122	do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
aoqi@0	123	do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
aoqi@0	124	\
aoqi@0	125	/* Preload ref klasses and set reference types */ \
aoqi@0	126	do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
aoqi@0	127	do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
aoqi@0	128	do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
aoqi@0	129	do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
aoqi@0	130	do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
aoqi@0	131	\
aoqi@0	132	do_klass(Thread_klass, java_lang_Thread, Pre ) \
aoqi@0	133	do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
aoqi@0	134	do_klass(Properties_klass, java_util_Properties, Pre ) \
aoqi@0	135	do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
aoqi@0	136	do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
aoqi@0	137	do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter, Opt ) \
aoqi@0	138	do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
aoqi@0	139	do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
aoqi@0	140	\
aoqi@0	141	/* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
aoqi@0	142	/* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
aoqi@0	143	/* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
aoqi@0	144	do_klass(reflect_MagicAccessorImpl_klass, sun_reflect_MagicAccessorImpl, Opt ) \
aoqi@0	145	do_klass(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
aoqi@0	146	do_klass(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
aoqi@0	147	do_klass(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt ) \
aoqi@0	148	do_klass(reflect_ConstantPool_klass, sun_reflect_ConstantPool, Opt_Only_JDK15 ) \
aoqi@0	149	do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
aoqi@0	150	do_klass(reflect_CallerSensitive_klass, sun_reflect_CallerSensitive, Opt ) \
aoqi@0	151	\
aoqi@0	152	/* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
aoqi@0	153	do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle, Opt ) \
aoqi@0	154	do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
aoqi@0	155	do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
aoqi@0	156	do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
aoqi@0	157	do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
aoqi@0	158	do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
aoqi@0	159	do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
aoqi@0	160	do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
aoqi@0	161	do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
aoqi@0	162	do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
aoqi@0	163	do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
aoqi@0	164	/* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
aoqi@0	165	\
aoqi@0	166	do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
aoqi@0	167	do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
aoqi@0	168	do_klass(misc_Unsafe_klass, sun_misc_Unsafe, Pre ) \
aoqi@0	169	\
aoqi@0	170	/* It's NULL in non-1.4 JDKs. */ \
aoqi@0	171	do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
aoqi@0	172	/* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
aoqi@0	173	/* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
aoqi@0	174	do_klass(nio_Buffer_klass, java_nio_Buffer, Opt ) \
aoqi@0	175	\
aoqi@0	176	/* Preload boxing klasses */ \
aoqi@0	177	do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
aoqi@0	178	do_klass(Character_klass, java_lang_Character, Pre ) \
aoqi@0	179	do_klass(Float_klass, java_lang_Float, Pre ) \
aoqi@0	180	do_klass(Double_klass, java_lang_Double, Pre ) \
aoqi@0	181	do_klass(Byte_klass, java_lang_Byte, Pre ) \
aoqi@0	182	do_klass(Short_klass, java_lang_Short, Pre ) \
aoqi@0	183	do_klass(Integer_klass, java_lang_Integer, Pre ) \
aoqi@0	184	do_klass(Long_klass, java_lang_Long, Pre ) \
aoqi@0	185	/*end*/
aoqi@0	186
aoqi@0	187
aoqi@0	188	class SystemDictionary : AllStatic {
aoqi@0	189	friend class VMStructs;
aoqi@0	190	friend class SystemDictionaryHandles;
aoqi@0	191
aoqi@0	192	public:
aoqi@0	193	enum WKID {
aoqi@0	194	NO_WKID = 0,
aoqi@0	195
aoqi@0	196	#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	197	WK_KLASSES_DO(WK_KLASS_ENUM)
aoqi@0	198	#undef WK_KLASS_ENUM
aoqi@0	199
aoqi@0	200	WKID_LIMIT,
aoqi@0	201
aoqi@0	202	FIRST_WKID = NO_WKID + 1
aoqi@0	203	};
aoqi@0	204
aoqi@0	205	enum InitOption {
aoqi@0	206	Pre, // preloaded; error if not present
aoqi@0	207	Pre_JSR292, // preloaded if EnableInvokeDynamic
aoqi@0	208
aoqi@0	209	// Order is significant. Options before this point require resolve_or_fail.
aoqi@0	210	// Options after this point will use resolve_or_null instead.
aoqi@0	211
aoqi@0	212	Opt, // preload tried; NULL if not present
aoqi@0	213	Opt_Only_JDK14NewRef, // preload tried; use only with NewReflection
aoqi@0	214	Opt_Only_JDK15, // preload tried; use only with JDK1.5+
aoqi@0	215	OPTION_LIMIT,
aoqi@0	216	CEIL_LG_OPTION_LIMIT = 4 // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
aoqi@0	217	};
aoqi@0	218
aoqi@0	219
aoqi@0	220	// Returns a class with a given class name and class loader. Loads the
aoqi@0	221	// class if needed. If not found a NoClassDefFoundError or a
aoqi@0	222	// ClassNotFoundException is thrown, depending on the value on the
aoqi@0	223	// throw_error flag. For most uses the throw_error argument should be set
aoqi@0	224	// to true.
aoqi@0	225
aoqi@0	226	static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
aoqi@0	227	// Convenient call for null loader and protection domain.
aoqi@0	228	static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
aoqi@0	229	private:
aoqi@0	230	// handle error translation for resolve_or_null results
aoqi@0	231	static Klass* handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
aoqi@0	232
aoqi@0	233	public:
aoqi@0	234
aoqi@0	235	// Returns a class with a given class name and class loader.
aoqi@0	236	// Loads the class if needed. If not found NULL is returned.
aoqi@0	237	static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	238	// Version with null loader and protection domain
aoqi@0	239	static Klass* resolve_or_null(Symbol* class_name, TRAPS);
aoqi@0	240
aoqi@0	241	// Resolve a superclass or superinterface. Called from ClassFileParser,
aoqi@0	242	// parse_interfaces, resolve_instance_class_or_null, load_shared_class
aoqi@0	243	// "child_name" is the class whose super class or interface is being resolved.
aoqi@0	244	static Klass* resolve_super_or_fail(Symbol* child_name,
aoqi@0	245	Symbol* class_name,
aoqi@0	246	Handle class_loader,
aoqi@0	247	Handle protection_domain,
aoqi@0	248	bool is_superclass,
aoqi@0	249	TRAPS);
aoqi@0	250
aoqi@0	251	// Parse new stream. This won't update the system dictionary or
aoqi@0	252	// class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
aoqi@0	253	static Klass* parse_stream(Symbol* class_name,
aoqi@0	254	Handle class_loader,
aoqi@0	255	Handle protection_domain,
aoqi@0	256	ClassFileStream* st,
aoqi@0	257	TRAPS) {
aoqi@0	258	KlassHandle nullHandle;
aoqi@0	259	return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
aoqi@0	260	}
aoqi@0	261	static Klass* parse_stream(Symbol* class_name,
aoqi@0	262	Handle class_loader,
aoqi@0	263	Handle protection_domain,
aoqi@0	264	ClassFileStream* st,
aoqi@0	265	KlassHandle host_klass,
aoqi@0	266	GrowableArray<Handle>* cp_patches,
aoqi@0	267	TRAPS);
aoqi@0	268
aoqi@0	269	// Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
aoqi@0	270	static Klass* resolve_from_stream(Symbol* class_name, Handle class_loader,
aoqi@0	271	Handle protection_domain,
aoqi@0	272	ClassFileStream* st, bool verify, TRAPS);
aoqi@0	273
aoqi@0	274	// Lookup an already loaded class. If not found NULL is returned.
aoqi@0	275	static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	276
aoqi@0	277	// Lookup an already loaded instance or array class.
aoqi@0	278	// Do not make any queries to class loaders; consult only the cache.
aoqi@0	279	// If not found NULL is returned.
aoqi@0	280	static Klass* find_instance_or_array_klass(Symbol* class_name,
aoqi@0	281	Handle class_loader,
aoqi@0	282	Handle protection_domain,
aoqi@0	283	TRAPS);
aoqi@0	284
aoqi@0	285	// Lookup an instance or array class that has already been loaded
aoqi@0	286	// either into the given class loader, or else into another class
aoqi@0	287	// loader that is constrained (via loader constraints) to produce
aoqi@0	288	// a consistent class. Do not take protection domains into account.
aoqi@0	289	// Do not make any queries to class loaders; consult only the cache.
aoqi@0	290	// Return NULL if the class is not found.
aoqi@0	291	//
aoqi@0	292	// This function is a strict superset of find_instance_or_array_klass.
aoqi@0	293	// This function (the unchecked version) makes a conservative prediction
aoqi@0	294	// of the result of the checked version, assuming successful lookup.
aoqi@0	295	// If both functions return non-null, they must return the same value.
aoqi@0	296	// Also, the unchecked version may sometimes be non-null where the
aoqi@0	297	// checked version is null. This can occur in several ways:
aoqi@0	298	// 1. No query has yet been made to the class loader.
aoqi@0	299	// 2. The class loader was queried, but chose not to delegate.
aoqi@0	300	// 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
aoqi@0	301	// 4. Loading was attempted, but there was a linkage error of some sort.
aoqi@0	302	// In all of these cases, the loader constraints on this type are
aoqi@0	303	// satisfied, and it is safe for classes in the given class loader
aoqi@0	304	// to manipulate strongly-typed values of the found class, subject
aoqi@0	305	// to local linkage and access checks.
aoqi@0	306	static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
aoqi@0	307	Handle class_loader,
aoqi@0	308	TRAPS);
aoqi@0	309
aoqi@0	310	// Iterate over all klasses in dictionary
aoqi@0	311	// Just the classes from defining class loaders
aoqi@0	312	static void classes_do(void f(Klass*));
aoqi@0	313	// Added for initialize_itable_for_klass to handle exceptions
aoqi@0	314	static void classes_do(void f(Klass*, TRAPS), TRAPS);
aoqi@0	315	// All classes, and their class loaders
aoqi@0	316	static void classes_do(void f(Klass*, ClassLoaderData*));
aoqi@0	317
aoqi@0	318	static void placeholders_do(void f(Symbol*));
aoqi@0	319
aoqi@0	320	// Iterate over all methods in all klasses in dictionary
aoqi@0	321	static void methods_do(void f(Method*));
aoqi@0	322
aoqi@0	323	// Garbage collection support
aoqi@0	324
aoqi@0	325	// This method applies "blk->do_oop" to all the pointers to "system"
aoqi@0	326	// classes and loaders.
aoqi@0	327	static void always_strong_oops_do(OopClosure* blk);
aoqi@0	328	static void always_strong_classes_do(KlassClosure* closure);
aoqi@0	329
aoqi@0	330	// Unload (that is, break root links to) all unmarked classes and
aoqi@0	331	// loaders. Returns "true" iff something was unloaded.
aoqi@0	332	static bool do_unloading(BoolObjectClosure* is_alive);
aoqi@0	333
aoqi@0	334	static int calculate_systemdictionary_size(int loadedclasses);
aoqi@0	335
aoqi@0	336	// Applies "f->do_oop" to all root oops in the system dictionary.
aoqi@0	337	static void oops_do(OopClosure* f);
aoqi@0	338
aoqi@0	339	// System loader lock
aoqi@0	340	static oop system_loader_lock() { return _system_loader_lock_obj; }
aoqi@0	341
aoqi@0	342	private:
aoqi@0	343	// Extended Redefine classes support (tbi)
aoqi@0	344	static void preloaded_classes_do(KlassClosure* f);
aoqi@0	345	static void lazily_loaded_classes_do(KlassClosure* f);
aoqi@0	346	public:
aoqi@0	347	// Sharing support.
aoqi@0	348	static void reorder_dictionary();
aoqi@0	349	static void copy_buckets(char** top, char* end);
aoqi@0	350	static void copy_table(char** top, char* end);
aoqi@0	351	static void reverse();
aoqi@0	352	static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
aoqi@0	353	int number_of_entries);
aoqi@0	354	// Printing
aoqi@0	355	static void print() PRODUCT_RETURN;
aoqi@0	356	static void print_class_statistics() PRODUCT_RETURN;
aoqi@0	357	static void print_method_statistics() PRODUCT_RETURN;
aoqi@0	358
aoqi@0	359	// Number of contained klasses
aoqi@0	360	// This is both fully loaded classes and classes in the process
aoqi@0	361	// of being loaded
aoqi@0	362	static int number_of_classes();
aoqi@0	363
aoqi@0	364	// Monotonically increasing counter which grows as classes are
aoqi@0	365	// loaded or modifications such as hot-swapping or setting/removing
aoqi@0	366	// of breakpoints are performed
aoqi@0	367	static inline int number_of_modifications() { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
aoqi@0	368	// Needed by evolution and breakpoint code
aoqi@0	369	static inline void notice_modification() { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications; }
aoqi@0	370
aoqi@0	371	// Verification
aoqi@0	372	static void verify();
aoqi@0	373
aoqi@0	374	#ifdef ASSERT
aoqi@0	375	static bool is_internal_format(Symbol* class_name);
aoqi@0	376	#endif
aoqi@0	377
aoqi@0	378	// Initialization
aoqi@0	379	static void initialize(TRAPS);
aoqi@0	380
aoqi@0	381	// Fast access to commonly used classes (preloaded)
aoqi@0	382	static Klass* check_klass(Klass* k) {
aoqi@0	383	assert(k != NULL, "preloaded klass not initialized");
aoqi@0	384	return k;
aoqi@0	385	}
aoqi@0	386
aoqi@0	387	static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
aoqi@0	388	static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
aoqi@0	389	static Klass* check_klass_Opt( Klass* k) { return k; }
aoqi@0	390	static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
aoqi@0	391	assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
aoqi@0	392	return k;
aoqi@0	393	}
aoqi@0	394	static Klass* check_klass_Opt_Only_JDK14NewRef(Klass* k) {
aoqi@0	395	assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
aoqi@0	396	// despite the optional loading, if you use this it must be present:
aoqi@0	397	return check_klass(k);
aoqi@0	398	}
aoqi@0	399
aoqi@0	400	static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
aoqi@0	401	static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
aoqi@0	402	static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
aoqi@0	403	int limit = (int)end_id + 1;
aoqi@0	404	initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
aoqi@0	405	}
aoqi@0	406
aoqi@0	407	public:
aoqi@0	408	#define WK_KLASS_DECLARE(name, symbol, option) \
aoqi@0	409	static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
aoqi@0	410	static Klass** name##_addr() { \
aoqi@0	411	return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
aoqi@0	412	}
aoqi@0	413	WK_KLASSES_DO(WK_KLASS_DECLARE);
aoqi@0	414	#undef WK_KLASS_DECLARE
aoqi@0	415
aoqi@0	416	static Klass* well_known_klass(WKID id) {
aoqi@0	417	assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
aoqi@0	418	return _well_known_klasses[id];
aoqi@0	419	}
aoqi@0	420
aoqi@0	421	static Klass** well_known_klass_addr(WKID id) {
aoqi@0	422	assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
aoqi@0	423	return &_well_known_klasses[id];
aoqi@0	424	}
aoqi@0	425
aoqi@0	426	// Local definition for direct access to the private array:
aoqi@0	427	#define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
aoqi@0	428
aoqi@0	429	static Klass* box_klass(BasicType t) {
aoqi@0	430	assert((uint)t < T_VOID+1, "range check");
aoqi@0	431	return check_klass(_box_klasses[t]);
aoqi@0	432	}
aoqi@0	433	static BasicType box_klass_type(Klass* k); // inverse of box_klass
aoqi@0	434
aoqi@0	435	// methods returning lazily loaded klasses
aoqi@0	436	// The corresponding method to load the class must be called before calling them.
aoqi@0	437	static Klass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
aoqi@0	438
aoqi@0	439	static void load_abstract_ownable_synchronizer_klass(TRAPS);
aoqi@0	440
aoqi@0	441	private:
aoqi@0	442	// Tells whether ClassLoader.loadClassInternal is present
aoqi@0	443	static bool has_loadClassInternal() { return _has_loadClassInternal; }
aoqi@0	444
aoqi@0	445	// Returns the class loader data to be used when looking up/updating the
aoqi@0	446	// system dictionary.
aoqi@0	447	static ClassLoaderData *class_loader_data(Handle class_loader) {
aoqi@0	448	return ClassLoaderData::class_loader_data(class_loader());
aoqi@0	449	}
aoqi@0	450
aoqi@0	451	public:
aoqi@0	452	// Tells whether ClassLoader.checkPackageAccess is present
aoqi@0	453	static bool has_checkPackageAccess() { return _has_checkPackageAccess; }
aoqi@0	454
aoqi@0	455	static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
aoqi@0	456	static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
aoqi@0	457	static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
aoqi@0	458	static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
aoqi@0	459	static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
aoqi@0	460
aoqi@0	461	// Returns default system loader
aoqi@0	462	static oop java_system_loader();
aoqi@0	463
aoqi@0	464	// Compute the default system loader
aoqi@0	465	static void compute_java_system_loader(TRAPS);
aoqi@0	466
aoqi@0	467	// Register a new class loader
aoqi@0	468	static ClassLoaderData* register_loader(Handle class_loader, TRAPS);
aoqi@0	469	private:
aoqi@0	470	// Mirrors for primitive classes (created eagerly)
aoqi@0	471	static oop check_mirror(oop m) {
aoqi@0	472	assert(m != NULL, "mirror not initialized");
aoqi@0	473	return m;
aoqi@0	474	}
aoqi@0	475
aoqi@0	476	public:
aoqi@0	477	// Note: java_lang_Class::primitive_type is the inverse of java_mirror
aoqi@0	478
aoqi@0	479	// Check class loader constraints
aoqi@0	480	static bool add_loader_constraint(Symbol* name, Handle loader1,
aoqi@0	481	Handle loader2, TRAPS);
aoqi@0	482	static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
aoqi@0	483	Handle loader2, bool is_method, TRAPS);
aoqi@0	484
aoqi@0	485	// JSR 292
aoqi@0	486	// find a java.lang.invoke.MethodHandle.invoke* method for a given signature
aoqi@0	487	// (asks Java to compute it if necessary, except in a compiler thread)
aoqi@0	488	static methodHandle find_method_handle_invoker(Symbol* name,
aoqi@0	489	Symbol* signature,
aoqi@0	490	KlassHandle accessing_klass,
aoqi@0	491	Handle *appendix_result,
aoqi@0	492	Handle *method_type_result,
aoqi@0	493	TRAPS);
aoqi@0	494	// for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
aoqi@0	495	// (does not ask Java, since this is a low-level intrinsic defined by the JVM)
aoqi@0	496	static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
aoqi@0	497	Symbol* signature,
aoqi@0	498	TRAPS);
aoqi@0	499	// find a java.lang.invoke.MethodType object for a given signature
aoqi@0	500	// (asks Java to compute it if necessary, except in a compiler thread)
aoqi@0	501	static Handle find_method_handle_type(Symbol* signature,
aoqi@0	502	KlassHandle accessing_klass,
aoqi@0	503	TRAPS);
aoqi@0	504
aoqi@0	505	// ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
aoqi@0	506	static Handle link_method_handle_constant(KlassHandle caller,
aoqi@0	507	int ref_kind, //e.g., JVM_REF_invokeVirtual
aoqi@0	508	KlassHandle callee,
aoqi@0	509	Symbol* name,
aoqi@0	510	Symbol* signature,
aoqi@0	511	TRAPS);
aoqi@0	512
aoqi@0	513	// ask Java to create a dynamic call site, while linking an invokedynamic op
aoqi@0	514	static methodHandle find_dynamic_call_site_invoker(KlassHandle caller,
aoqi@0	515	Handle bootstrap_method,
aoqi@0	516	Symbol* name,
aoqi@0	517	Symbol* type,
aoqi@0	518	Handle *appendix_result,
aoqi@0	519	Handle *method_type_result,
aoqi@0	520	TRAPS);
aoqi@0	521
aoqi@0	522	// Utility for printing loader "name" as part of tracing constraints
aoqi@0	523	static const char* loader_name(oop loader) {
aoqi@0	524	return ((loader) == NULL ? "<bootloader>" :
aoqi@0	525	InstanceKlass::cast((loader)->klass())->name()->as_C_string() );
aoqi@0	526	}
aoqi@0	527	static const char* loader_name(ClassLoaderData* loader_data) {
aoqi@0	528	return (loader_data->class_loader() == NULL ? "<bootloader>" :
aoqi@0	529	InstanceKlass::cast((loader_data->class_loader())->klass())->name()->as_C_string() );
aoqi@0	530	}
aoqi@0	531
aoqi@0	532	// Record the error when the first attempt to resolve a reference from a constant
aoqi@0	533	// pool entry to a class fails.
aoqi@0	534	static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
aoqi@0	535	static void delete_resolution_error(ConstantPool* pool);
aoqi@0	536	static Symbol* find_resolution_error(constantPoolHandle pool, int which);
aoqi@0	537
aoqi@0	538	private:
aoqi@0	539
aoqi@0	540	enum Constants {
aoqi@0	541	_loader_constraint_size = 107, // number of entries in constraint table
aoqi@0	542	_resolution_error_size = 107, // number of entries in resolution error table
aoqi@0	543	_invoke_method_size = 139, // number of entries in invoke method table
aoqi@0	544	_nof_buckets = 1009, // number of buckets in hash table for placeholders
aoqi@0	545	_old_default_sdsize = 1009, // backward compat for system dictionary size
aoqi@0	546	_prime_array_size = 8, // array of primes for system dictionary size
aoqi@0	547	_average_depth_goal = 3 // goal for lookup length
aoqi@0	548	};
aoqi@0	549
aoqi@0	550
aoqi@0	551	// Static variables
aoqi@0	552
aoqi@0	553	// hashtable sizes for system dictionary to allow growth
aoqi@0	554	// prime numbers for system dictionary size
aoqi@0	555	static int _sdgeneration;
aoqi@0	556	static const int _primelist[_prime_array_size];
aoqi@0	557
aoqi@0	558	// Hashtable holding loaded classes.
aoqi@0	559	static Dictionary* _dictionary;
aoqi@0	560
aoqi@0	561	// Hashtable holding placeholders for classes being loaded.
aoqi@0	562	static PlaceholderTable* _placeholders;
aoqi@0	563
aoqi@0	564	// Hashtable holding classes from the shared archive.
aoqi@0	565	static Dictionary* _shared_dictionary;
aoqi@0	566
aoqi@0	567	// Monotonically increasing counter which grows with
aoqi@0	568	// _number_of_classes as well as hot-swapping and breakpoint setting
aoqi@0	569	// and removal.
aoqi@0	570	static int _number_of_modifications;
aoqi@0	571
aoqi@0	572	// Lock object for system class loader
aoqi@0	573	static oop _system_loader_lock_obj;
aoqi@0	574
aoqi@0	575	// Constraints on class loaders
aoqi@0	576	static LoaderConstraintTable* _loader_constraints;
aoqi@0	577
aoqi@0	578	// Resolution errors
aoqi@0	579	static ResolutionErrorTable* _resolution_errors;
aoqi@0	580
aoqi@0	581	// Invoke methods (JSR 292)
aoqi@0	582	static SymbolPropertyTable* _invoke_method_table;
aoqi@0	583
aoqi@0	584	public:
aoqi@0	585	// for VM_CounterDecay iteration support
aoqi@0	586	friend class CounterDecay;
aoqi@0	587	static Klass* try_get_next_class();
aoqi@0	588
aoqi@0	589	private:
aoqi@0	590	static void validate_protection_domain(instanceKlassHandle klass,
aoqi@0	591	Handle class_loader,
aoqi@0	592	Handle protection_domain, TRAPS);
aoqi@0	593
aoqi@0	594	friend class VM_PopulateDumpSharedSpace;
aoqi@0	595	friend class TraversePlaceholdersClosure;
aoqi@0	596	static Dictionary* dictionary() { return _dictionary; }
aoqi@0	597	static Dictionary* shared_dictionary() { return _shared_dictionary; }
aoqi@0	598	static PlaceholderTable* placeholders() { return _placeholders; }
aoqi@0	599	static LoaderConstraintTable* constraints() { return _loader_constraints; }
aoqi@0	600	static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
aoqi@0	601	static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
aoqi@0	602
aoqi@0	603	// Basic loading operations
aoqi@0	604	static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	605	static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
aoqi@0	606	static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
aoqi@0	607	// Wait on SystemDictionary_lock; unlocks lockObject before
aoqi@0	608	// waiting; relocks lockObject with correct recursion count
aoqi@0	609	// after waiting, but before reentering SystemDictionary_lock
aoqi@0	610	// to preserve lock order semantics.
aoqi@0	611	static void double_lock_wait(Handle lockObject, TRAPS);
aoqi@0	612	static void define_instance_class(instanceKlassHandle k, TRAPS);
aoqi@0	613	static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
aoqi@0	614	Handle class_loader,
aoqi@0	615	instanceKlassHandle k, TRAPS);
aoqi@0	616	static instanceKlassHandle load_shared_class(Symbol* class_name,
aoqi@0	617	Handle class_loader, TRAPS);
aoqi@0	618	static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
aoqi@0	619	Handle class_loader, TRAPS);
aoqi@0	620	static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
aoqi@0	621	static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
aoqi@0	622	static void check_loader_lock_contention(Handle loader_lock, TRAPS);
aoqi@0	623	static bool is_parallelCapable(Handle class_loader);
aoqi@0	624	static bool is_parallelDefine(Handle class_loader);
aoqi@0	625
aoqi@0	626	public:
aoqi@0	627	static bool is_ext_class_loader(Handle class_loader);
aoqi@0	628
aoqi@0	629	private:
aoqi@0	630	static Klass* find_shared_class(Symbol* class_name);
aoqi@0	631
aoqi@0	632	// Setup link to hierarchy
aoqi@0	633	static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
aoqi@0	634
aoqi@0	635	// event based tracing
aoqi@0	636	static void post_class_load_event(const Ticks& start_time, instanceKlassHandle k,
aoqi@0	637	Handle initiating_loader);
aoqi@0	638	// We pass in the hashtable index so we can calculate it outside of
aoqi@0	639	// the SystemDictionary_lock.
aoqi@0	640
aoqi@0	641	// Basic find on loaded classes
aoqi@0	642	static Klass* find_class(int index, unsigned int hash,
aoqi@0	643	Symbol* name, ClassLoaderData* loader_data);
aoqi@0	644	static Klass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
aoqi@0	645
aoqi@0	646	// Basic find on classes in the midst of being loaded
aoqi@0	647	static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
aoqi@0	648
aoqi@0	649	// Updating entry in dictionary
aoqi@0	650	// Add a completely loaded class
aoqi@0	651	static void add_klass(int index, Symbol* class_name,
aoqi@0	652	ClassLoaderData* loader_data, KlassHandle obj);
aoqi@0	653
aoqi@0	654	// Add a placeholder for a class being loaded
aoqi@0	655	static void add_placeholder(int index,
aoqi@0	656	Symbol* class_name,
aoqi@0	657	ClassLoaderData* loader_data);
aoqi@0	658	static void remove_placeholder(int index,
aoqi@0	659	Symbol* class_name,
aoqi@0	660	ClassLoaderData* loader_data);
aoqi@0	661
aoqi@0	662	// Performs cleanups after resolve_super_or_fail. This typically needs
aoqi@0	663	// to be called on failure.
aoqi@0	664	// Won't throw, but can block.
aoqi@0	665	static void resolution_cleanups(Symbol* class_name,
aoqi@0	666	ClassLoaderData* loader_data,
aoqi@0	667	TRAPS);
aoqi@0	668
aoqi@0	669	// Initialization
aoqi@0	670	static void initialize_preloaded_classes(TRAPS);
aoqi@0	671
aoqi@0	672	// Class loader constraints
aoqi@0	673	static void check_constraints(int index, unsigned int hash,
aoqi@0	674	instanceKlassHandle k, Handle loader,
aoqi@0	675	bool defining, TRAPS);
aoqi@0	676	static void update_dictionary(int d_index, unsigned int d_hash,
aoqi@0	677	int p_index, unsigned int p_hash,
aoqi@0	678	instanceKlassHandle k, Handle loader,
aoqi@0	679	TRAPS);
aoqi@0	680
aoqi@0	681	// Variables holding commonly used klasses (preloaded)
aoqi@0	682	static Klass* _well_known_klasses[];
aoqi@0	683
aoqi@0	684	// Lazily loaded klasses
aoqi@0	685	static Klass* volatile _abstract_ownable_synchronizer_klass;
aoqi@0	686
aoqi@0	687	// table of box klasses (int_klass, etc.)
aoqi@0	688	static Klass* _box_klasses[T_VOID+1];
aoqi@0	689
aoqi@0	690	static oop _java_system_loader;
aoqi@0	691
aoqi@0	692	static bool _has_loadClassInternal;
aoqi@0	693	static bool _has_checkPackageAccess;
aoqi@0	694	};
aoqi@0	695
aoqi@0	696	#endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP