JDK14/Java14源码在线阅读
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* This code is free software; you can redistribute it and/or modify it
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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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#ifndef SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
#define SHARE_CLASSFILE_SYSTEMDICTIONARY_HPP
#include "classfile/classLoaderData.hpp"
#include "oops/objArrayOop.hpp"
#include "oops/symbol.hpp"
#include "runtime/java.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/reflectionUtils.hpp"
#include "runtime/signature.hpp"
#include "utilities/hashtable.hpp"
// The dictionary in each ClassLoaderData stores all loaded classes, either
// initiatied by its class loader or defined by its class loader:
//
// class loader -> ClassLoaderData -> [class, protection domain set]
//
// Classes are loaded lazily. The default VM class loader is
// represented as NULL.
// The underlying data structure is an open hash table (Dictionary) per
// ClassLoaderData with a fixed number of buckets. During loading the
// class loader object is locked, (for the VM loader a private lock object is used).
// The global SystemDictionary_lock is held for all additions into the ClassLoaderData
// dictionaries. TODO: fix lock granularity so that class loading can
// be done concurrently, but only by different loaders.
//
// During loading a placeholder (name, loader) is temporarily placed in
// a side data structure, and is used to detect ClassCircularityErrors
// and to perform verification during GC. A GC can occur in the midst
// of class loading, as we call out to Java, have to take locks, etc.
//
// When class loading is finished, a new entry is added to the dictionary
// of the class loader and the placeholder is removed. Note that the protection
// domain field of the dictionary entry has not yet been filled in when
// the "real" dictionary entry is created.
//
// Clients of this class who are interested in finding if a class has
// been completely loaded -- not classes in the process of being loaded --
// can read the dictionary unlocked. This is safe because
// - entries are only deleted at safepoints
// - readers cannot come to a safepoint while actively examining
// an entry (an entry cannot be deleted from under a reader)
// - entries must be fully formed before they are available to concurrent
// readers (we must ensure write ordering)
//
// Note that placeholders are deleted at any time, as they are removed
// when a class is completely loaded. Therefore, readers as well as writers
// of placeholders must hold the SystemDictionary_lock.
//
class BootstrapInfo;
class ClassFileStream;
class Dictionary;
class PlaceholderTable;
class LoaderConstraintTable;
template <MEMFLAGS F> class HashtableBucket;
class ResolutionErrorTable;
class SymbolPropertyTable;
class ProtectionDomainCacheTable;
class ProtectionDomainCacheEntry;
class GCTimer;
#define WK_KLASS_ENUM_NAME(kname) kname##_knum
// Certain classes, such as java.lang.Object and java.lang.String,
// are "well-known", in the sense that no class loader is allowed
// to provide a different definition.
//
// Each well-known class has a short klass name (like object_klass),
// and a vmSymbol name (like java_lang_Object).
//
// The order of these definitions is significant: the classes are
// resolved during early VM start-up by resolve_well_known_classes
// in this order. Changing the order may require careful restructuring
// of the VM start-up sequence.
//
#define WK_KLASSES_DO(do_klass) \
/* well-known classes */ \
do_klass(Object_klass, java_lang_Object ) \
do_klass(String_klass, java_lang_String ) \
do_klass(Class_klass, java_lang_Class ) \
do_klass(Cloneable_klass, java_lang_Cloneable ) \
do_klass(ClassLoader_klass, java_lang_ClassLoader ) \
do_klass(Serializable_klass, java_io_Serializable ) \
do_klass(System_klass, java_lang_System ) \
do_klass(Throwable_klass, java_lang_Throwable ) \
do_klass(Error_klass, java_lang_Error ) \
do_klass(ThreadDeath_klass, java_lang_ThreadDeath ) \
do_klass(Exception_klass, java_lang_Exception ) \
do_klass(RuntimeException_klass, java_lang_RuntimeException ) \
do_klass(SecurityManager_klass, java_lang_SecurityManager ) \
do_klass(ProtectionDomain_klass, java_security_ProtectionDomain ) \
do_klass(AccessControlContext_klass, java_security_AccessControlContext ) \
do_klass(AccessController_klass, java_security_AccessController ) \
do_klass(SecureClassLoader_klass, java_security_SecureClassLoader ) \
do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException ) \
do_klass(Record_klass, java_lang_Record ) \
do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError ) \
do_klass(LinkageError_klass, java_lang_LinkageError ) \
do_klass(ClassCastException_klass, java_lang_ClassCastException ) \
do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException ) \
do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError ) \
do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError ) \
do_klass(StackOverflowError_klass, java_lang_StackOverflowError ) \
do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException ) \
do_klass(Reference_klass, java_lang_ref_Reference ) \
\
/* ref klasses and set reference types */ \
do_klass(SoftReference_klass, java_lang_ref_SoftReference ) \
do_klass(WeakReference_klass, java_lang_ref_WeakReference ) \
do_klass(FinalReference_klass, java_lang_ref_FinalReference ) \
do_klass(PhantomReference_klass, java_lang_ref_PhantomReference ) \
do_klass(Finalizer_klass, java_lang_ref_Finalizer ) \
\
do_klass(Thread_klass, java_lang_Thread ) \
do_klass(ThreadGroup_klass, java_lang_ThreadGroup ) \
do_klass(Properties_klass, java_util_Properties ) \
do_klass(Module_klass, java_lang_Module ) \
do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject ) \
do_klass(reflect_Field_klass, java_lang_reflect_Field ) \
do_klass(reflect_Parameter_klass, java_lang_reflect_Parameter ) \
do_klass(reflect_Method_klass, java_lang_reflect_Method ) \
do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor ) \
\
/* 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 ) \
do_klass(reflect_MethodAccessorImpl_klass, reflect_MethodAccessorImpl ) \
do_klass(reflect_ConstructorAccessorImpl_klass, reflect_ConstructorAccessorImpl ) \
do_klass(reflect_DelegatingClassLoader_klass, reflect_DelegatingClassLoader ) \
do_klass(reflect_ConstantPool_klass, reflect_ConstantPool ) \
do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl ) \
do_klass(reflect_CallerSensitive_klass, reflect_CallerSensitive ) \
do_klass(reflect_NativeConstructorAccessorImpl_klass, reflect_NativeConstructorAccessorImpl ) \
\
/* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
do_klass(DirectMethodHandle_klass, java_lang_invoke_DirectMethodHandle ) \
do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle ) \
do_klass(VarHandle_klass, java_lang_invoke_VarHandle ) \
do_klass(MemberName_klass, java_lang_invoke_MemberName ) \
do_klass(ResolvedMethodName_klass, java_lang_invoke_ResolvedMethodName ) \
do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives ) \
do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm ) \
do_klass(MethodType_klass, java_lang_invoke_MethodType ) \
do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError ) \
do_klass(CallSite_klass, java_lang_invoke_CallSite ) \
do_klass(Context_klass, java_lang_invoke_MethodHandleNatives_CallSiteContext ) \
do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite ) \
do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite ) \
do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite ) \
/* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
\
do_klass(AssertionStatusDirectives_klass, java_lang_AssertionStatusDirectives ) \
do_klass(StringBuffer_klass, java_lang_StringBuffer ) \
do_klass(StringBuilder_klass, java_lang_StringBuilder ) \
do_klass(UnsafeConstants_klass, jdk_internal_misc_UnsafeConstants ) \
do_klass(internal_Unsafe_klass, jdk_internal_misc_Unsafe ) \
do_klass(module_Modules_klass, jdk_internal_module_Modules ) \
\
/* support for CDS */ \
do_klass(ByteArrayInputStream_klass, java_io_ByteArrayInputStream ) \
do_klass(URL_klass, java_net_URL ) \
do_klass(Jar_Manifest_klass, java_util_jar_Manifest ) \
do_klass(jdk_internal_loader_ClassLoaders_klass, jdk_internal_loader_ClassLoaders ) \
do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass, jdk_internal_loader_ClassLoaders_AppClassLoader) \
do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader) \
do_klass(CodeSource_klass, java_security_CodeSource ) \
\
do_klass(StackTraceElement_klass, java_lang_StackTraceElement ) \
\
/* It's okay if this turns out to be NULL in non-1.4 JDKs. */ \
do_klass(nio_Buffer_klass, java_nio_Buffer ) \
\
/* Stack Walking */ \
do_klass(StackWalker_klass, java_lang_StackWalker ) \
do_klass(AbstractStackWalker_klass, java_lang_StackStreamFactory_AbstractStackWalker ) \
do_klass(StackFrameInfo_klass, java_lang_StackFrameInfo ) \
do_klass(LiveStackFrameInfo_klass, java_lang_LiveStackFrameInfo ) \
\
/* support for stack dump lock analysis */ \
do_klass(java_util_concurrent_locks_AbstractOwnableSynchronizer_klass, java_util_concurrent_locks_AbstractOwnableSynchronizer) \
\
/* boxing klasses */ \
do_klass(Boolean_klass, java_lang_Boolean ) \
do_klass(Character_klass, java_lang_Character ) \
do_klass(Float_klass, java_lang_Float ) \
do_klass(Double_klass, java_lang_Double ) \
do_klass(Byte_klass, java_lang_Byte ) \
do_klass(Short_klass, java_lang_Short ) \
do_klass(Integer_klass, java_lang_Integer ) \
do_klass(Long_klass, java_lang_Long ) \
\
/* force inline of iterators */ \
do_klass(Iterator_klass, java_util_Iterator ) \
\
/* support for records */ \
do_klass(RecordComponent_klass, java_lang_reflect_RecordComponent ) \
\
/*end*/
class SystemDictionary : AllStatic {
friend class BootstrapInfo;
friend class VMStructs;
friend class SystemDictionaryHandles;
public:
enum WKID {
NO_WKID = 0,
#define WK_KLASS_ENUM(name, symbol) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
WK_KLASSES_DO(WK_KLASS_ENUM)
#undef WK_KLASS_ENUM
WKID_LIMIT,
FIRST_WKID = NO_WKID + 1
};
// Returns a class with a given class name and class loader. Loads the
// class if needed. If not found a NoClassDefFoundError or a
// ClassNotFoundException is thrown, depending on the value on the
// throw_error flag. For most uses the throw_error argument should be set
// to true.
static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
// Convenient call for null loader and protection domain.
static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
protected:
// handle error translation for resolve_or_null results
static Klass* handle_resolution_exception(Symbol* class_name, bool throw_error, Klass* klass, TRAPS);
public:
// Returns a class with a given class name and class loader.
// Loads the class if needed. If not found NULL is returned.
static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
// Version with null loader and protection domain
static Klass* resolve_or_null(Symbol* class_name, TRAPS);
// Resolve a superclass or superinterface. Called from ClassFileParser,
// parse_interfaces, resolve_instance_class_or_null, load_shared_class
// "child_name" is the class whose super class or interface is being resolved.
static InstanceKlass* resolve_super_or_fail(Symbol* child_name,
Symbol* class_name,
Handle class_loader,
Handle protection_domain,
bool is_superclass,
TRAPS);
// Parse new stream. This won't update the dictionary or
// class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
// Also used by Unsafe_DefineAnonymousClass
static InstanceKlass* parse_stream(Symbol* class_name,
Handle class_loader,
Handle protection_domain,
ClassFileStream* st,
TRAPS) {
return parse_stream(class_name,
class_loader,
protection_domain,
st,
NULL, // unsafe_anonymous_host
NULL, // cp_patches
THREAD);
}
static InstanceKlass* parse_stream(Symbol* class_name,
Handle class_loader,
Handle protection_domain,
ClassFileStream* st,
const InstanceKlass* unsafe_anonymous_host,
GrowableArray<Handle>* cp_patches,
TRAPS);
// Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
static InstanceKlass* resolve_from_stream(Symbol* class_name,
Handle class_loader,
Handle protection_domain,
ClassFileStream* st,
TRAPS);
// Lookup an already loaded class. If not found NULL is returned.
static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
// Lookup an already loaded instance or array class.
// Do not make any queries to class loaders; consult only the cache.
// If not found NULL is returned.
static Klass* find_instance_or_array_klass(Symbol* class_name,
Handle class_loader,
Handle protection_domain,
TRAPS);
// Lookup an instance or array class that has already been loaded
// either into the given class loader, or else into another class
// loader that is constrained (via loader constraints) to produce
// a consistent class. Do not take protection domains into account.
// Do not make any queries to class loaders; consult only the cache.
// Return NULL if the class is not found.
//
// This function is a strict superset of find_instance_or_array_klass.
// This function (the unchecked version) makes a conservative prediction
// of the result of the checked version, assuming successful lookup.
// If both functions return non-null, they must return the same value.
// Also, the unchecked version may sometimes be non-null where the
// checked version is null. This can occur in several ways:
// 1. No query has yet been made to the class loader.
// 2. The class loader was queried, but chose not to delegate.
// 3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
// 4. Loading was attempted, but there was a linkage error of some sort.
// In all of these cases, the loader constraints on this type are
// satisfied, and it is safe for classes in the given class loader
// to manipulate strongly-typed values of the found class, subject
// to local linkage and access checks.
static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
Handle class_loader,
TRAPS);
static void classes_do(MetaspaceClosure* it);
// Iterate over all methods in all klasses
static void methods_do(void f(Method*));
// Garbage collection support
// Unload (that is, break root links to) all unmarked classes and
// loaders. Returns "true" iff something was unloaded.
static bool do_unloading(GCTimer* gc_timer);
// Applies "f->do_oop" to all root oops in the system dictionary.
// If include_handles is true (the default), then the handles in the
// vm_global OopStorage object are included.
static void oops_do(OopClosure* f, bool include_handles = true);
// System loader lock
static oop system_loader_lock() { return _system_loader_lock_obj; }
// Protection Domain Table
static ProtectionDomainCacheTable* pd_cache_table() { return _pd_cache_table; }
public:
// Printing
static void print();
static void print_on(outputStream* st);
static void dump(outputStream* st, bool verbose);
// Verification
static void verify();
// Initialization
static void initialize(TRAPS);
// Checked fast access to the well-known classes -- so that you don't try to use them
// before they are resolved.
static InstanceKlass* check_klass(InstanceKlass* k) {
assert(k != NULL, "klass not loaded");
return k;
}
static bool resolve_wk_klass(WKID id, TRAPS);
static void resolve_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
static void resolve_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
int limit = (int)end_id + 1;
resolve_wk_klasses_until((WKID) limit, start_id, THREAD);
}
public:
#define WK_KLASS_DECLARE(name, symbol) \
static InstanceKlass* name() { return check_klass(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
static InstanceKlass** name##_addr() { \
return &_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
} \
static bool name##_is_loaded() { \
return _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)] != NULL; \
}
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
#ifdef ASSERT
static bool is_well_known_klass(Klass* k) {
return is_well_known_klass(k->name());
}
static bool is_well_known_klass(Symbol* class_name);
#endif
protected:
// Returns the class loader data to be used when looking up/updating the
// system dictionary.
static ClassLoaderData *class_loader_data(Handle class_loader) {
return ClassLoaderData::class_loader_data(class_loader());
}
public:
static bool Parameter_klass_loaded() { return WK_KLASS(reflect_Parameter_klass) != NULL; }
static bool Class_klass_loaded() { return WK_KLASS(Class_klass) != NULL; }
static bool Cloneable_klass_loaded() { return WK_KLASS(Cloneable_klass) != NULL; }
static bool Object_klass_loaded() { return WK_KLASS(Object_klass) != NULL; }
static bool ClassLoader_klass_loaded() { return WK_KLASS(ClassLoader_klass) != NULL; }
// Returns java system loader
static oop java_system_loader();
// Returns java platform loader
static oop java_platform_loader();
// Compute the java system and platform loaders
static void compute_java_loaders(TRAPS);
// Register a new class loader
static ClassLoaderData* register_loader(Handle class_loader);
protected:
// Mirrors for primitive classes (created eagerly)
static oop check_mirror(oop m) {
assert(m != NULL, "mirror not initialized");
return m;
}
public:
// Note: java_lang_Class::primitive_type is the inverse of java_mirror
// Check class loader constraints
static bool add_loader_constraint(Symbol* name, Handle loader1,
Handle loader2, TRAPS);
static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
Handle loader2, bool is_method, TRAPS);
// JSR 292
// find a java.lang.invoke.MethodHandle.invoke* method for a given signature
// (asks Java to compute it if necessary, except in a compiler thread)
static Method* find_method_handle_invoker(Klass* klass,
Symbol* name,
Symbol* signature,
Klass* accessing_klass,
Handle *appendix_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 Method* find_method_handle_intrinsic(vmIntrinsics::ID iid,
Symbol* signature,
TRAPS);
// compute java_mirror (java.lang.Class instance) for a type ("I", "[[B", "LFoo;", etc.)
// Either the accessing_klass or the CL/PD can be non-null, but not both.
static Handle find_java_mirror_for_type(Symbol* signature,
Klass* accessing_klass,
Handle class_loader,
Handle protection_domain,
SignatureStream::FailureMode failure_mode,
TRAPS);
static Handle find_java_mirror_for_type(Symbol* signature,
Klass* accessing_klass,
SignatureStream::FailureMode failure_mode,
TRAPS) {
// callee will fill in CL/PD from AK, if they are needed
return find_java_mirror_for_type(signature, accessing_klass, Handle(), Handle(),
failure_mode, THREAD);
}
// fast short-cut for the one-character case:
static oop find_java_mirror_for_type(char signature_char);
// find a java.lang.invoke.MethodType object for a given signature
// (asks Java to compute it if necessary, except in a compiler thread)
static Handle find_method_handle_type(Symbol* signature,
Klass* accessing_klass,
TRAPS);
// find a java.lang.Class object for a given signature
static Handle find_field_handle_type(Symbol* signature,
Klass* accessing_klass,
TRAPS);
// ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
static Handle link_method_handle_constant(Klass* caller,
int ref_kind, //e.g., JVM_REF_invokeVirtual
Klass* callee,
Symbol* name,
Symbol* signature,
TRAPS);
// ask Java to compute a constant by invoking a BSM given a Dynamic_info CP entry
static void invoke_bootstrap_method(BootstrapInfo& bootstrap_specifier, TRAPS);
// Record the error when the first attempt to resolve a reference from a constant
// pool entry to a class fails.
static void add_resolution_error(const constantPoolHandle& pool, int which, Symbol* error,
Symbol* message);
static void delete_resolution_error(ConstantPool* pool);
static Symbol* find_resolution_error(const constantPoolHandle& pool, int which,
Symbol** message);
static ProtectionDomainCacheEntry* cache_get(Handle protection_domain);
protected:
enum Constants {
_loader_constraint_size = 107, // number of entries in constraint table
_resolution_error_size = 107, // number of entries in resolution error table
_invoke_method_size = 139, // number of entries in invoke method table
_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;
// 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 PlaceholderTable* placeholders() { return _placeholders; }
static LoaderConstraintTable* constraints() { return _loader_constraints; }
static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
// Basic loading operations
static InstanceKlass* resolve_instance_class_or_null_helper(Symbol* name,
Handle class_loader,
Handle protection_domain,
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