jdk8-mips64-public/hotspot: src/share/vm/classfile/systemDictionary.hpp@688202ef6306 (annotated)

src/share/vm/classfile/systemDictionary.hpp@688202ef6306 (annotated)

src/share/vm/classfile/systemDictionary.hpp

Thu, 12 May 2011 19:39:58 -0700

author: never
date: Thu, 12 May 2011 19:39:58 -0700
changeset 2905: 688202ef6306
parent 2742: ed69575596ac
child 2941: 60b8287df30e
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
 #include "classfile/classFileStream.hpp"
 #include "classfile/classLoader.hpp"
 #include "oops/objArrayOop.hpp"
 #include "oops/symbol.hpp"
 #include "runtime/java.hpp"
 #include "runtime/reflectionUtils.hpp"
 #include "utilities/hashtable.hpp"
 // The system dictionary stores all loaded classes and maps:
 //
 //   [class name,class loader] -> class   i.e.  [Symbol*,oop] -> klassOop
 //
 // Classes are loaded lazily. The default VM class loader is
 // represented as NULL.
 // The underlying data structure is an open hash table with a fixed number
 // of buckets. During loading the loader object is locked, (for the VM loader
 // a private lock object is used). Class loading can thus be done concurrently,
 // but only by different loaders.
 //
 // During loading a placeholder (name, loader) is temporarily placed in
 // a side data structure, and is used to detect ClassCircularityErrors
 // and to perform verification during GC.  A GC can occur in the midst
 // of class loading, as we call out to Java, have to take locks, etc.
 //
 // When class loading is finished, a new entry is added to the system
 // dictionary and the place holder is removed. Note that the protection
 // domain field of the system dictionary has not yet been filled in when
 // the "real" system dictionary entry is created.
 //
 // Clients of this class who are interested in finding if a class has
 // been completely loaded -- not classes in the process of being loaded --
 // can read the SystemDictionary unlocked. This is safe because
 //    - entries are only deleted at safepoints
 //    - readers cannot come to a safepoint while actively examining
 //         an entry  (an entry cannot be deleted from under a reader)
 //    - entries must be fully formed before they are available to concurrent
 //         readers (we must ensure write ordering)
 //
 // Note that placeholders are deleted at any time, as they are removed
 // when a class is completely loaded. Therefore, readers as well as writers
 // of placeholders must hold the SystemDictionary_lock.
 //
 class Dictionary;
 class PlaceholderTable;
 class LoaderConstraintTable;
 class HashtableBucket;
 class ResolutionErrorTable;
 class SymbolPropertyTable;
 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
 // They are all "well-known", in the sense that no class loader is allowed
 // to provide a different definition.
 //
 // These klasses must all have names defined in vmSymbols.
 #define WK_KLASS_ENUM_NAME(kname)    kname##_knum
 // Each well-known class has a short klass name (like object_klass),
 // a vmSymbol name (like java_lang_Object), and a flag word
 // that makes some minor distinctions, like whether the klass
 // is preloaded, optional, release-specific, etc.
 // The order of these definitions is significant; it is the order in which
 // preloading is actually performed by initialize_preloaded_classes.
 #define WK_KLASSES_DO(template)                                               \
   /* well-known classes */                                                    \
   template(Object_klass,                 java_lang_Object,               Pre) \
   template(String_klass,                 java_lang_String,               Pre) \
   template(Class_klass,                  java_lang_Class,                Pre) \
   template(Cloneable_klass,              java_lang_Cloneable,            Pre) \
   template(ClassLoader_klass,            java_lang_ClassLoader,          Pre) \
   template(Serializable_klass,           java_io_Serializable,           Pre) \
   template(System_klass,                 java_lang_System,               Pre) \
   template(Throwable_klass,              java_lang_Throwable,            Pre) \
   template(Error_klass,                  java_lang_Error,                Pre) \
   template(ThreadDeath_klass,            java_lang_ThreadDeath,          Pre) \
   template(Exception_klass,              java_lang_Exception,            Pre) \
   template(RuntimeException_klass,       java_lang_RuntimeException,     Pre) \
   template(ProtectionDomain_klass,       java_security_ProtectionDomain, Pre) \
   template(AccessControlContext_klass,   java_security_AccessControlContext, Pre) \
   template(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre) \
   template(NoClassDefFoundError_klass,   java_lang_NoClassDefFoundError, Pre) \
   template(LinkageError_klass,           java_lang_LinkageError,         Pre) \
   template(ClassCastException_klass,     java_lang_ClassCastException,   Pre) \
   template(ArrayStoreException_klass,    java_lang_ArrayStoreException,  Pre) \
   template(VirtualMachineError_klass,    java_lang_VirtualMachineError,  Pre) \
   template(OutOfMemoryError_klass,       java_lang_OutOfMemoryError,     Pre) \
   template(StackOverflowError_klass,     java_lang_StackOverflowError,   Pre) \
   template(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre) \
   template(Reference_klass,              java_lang_ref_Reference,        Pre) \
                                                                               \
   /* Preload ref klasses and set reference types */                           \
   template(SoftReference_klass,          java_lang_ref_SoftReference,    Pre) \
   template(WeakReference_klass,          java_lang_ref_WeakReference,    Pre) \
   template(FinalReference_klass,         java_lang_ref_FinalReference,   Pre) \
   template(PhantomReference_klass,       java_lang_ref_PhantomReference, Pre) \
   template(Finalizer_klass,              java_lang_ref_Finalizer,        Pre) \
                                                                               \
   template(Thread_klass,                 java_lang_Thread,               Pre) \
   template(ThreadGroup_klass,            java_lang_ThreadGroup,          Pre) \
   template(Properties_klass,             java_util_Properties,           Pre) \
   template(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre) \
   template(reflect_Field_klass,          java_lang_reflect_Field,        Pre) \
   template(reflect_Method_klass,         java_lang_reflect_Method,       Pre) \
   template(reflect_Constructor_klass,    java_lang_reflect_Constructor,  Pre) \
                                                                               \
   /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
   /* Universe::is_gte_jdk14x_version() is not set up by this point. */        \
   /* It's okay if this turns out to be NULL in non-1.4 JDKs. */               \
   template(reflect_MagicAccessorImpl_klass,          sun_reflect_MagicAccessorImpl,  Opt) \
   template(reflect_MethodAccessorImpl_klass, sun_reflect_MethodAccessorImpl, Opt_Only_JDK14NewRef) \
   template(reflect_ConstructorAccessorImpl_klass, sun_reflect_ConstructorAccessorImpl, Opt_Only_JDK14NewRef) \
   template(reflect_DelegatingClassLoader_klass, sun_reflect_DelegatingClassLoader, Opt) \
   template(reflect_ConstantPool_klass,  sun_reflect_ConstantPool,       Opt_Only_JDK15) \
   template(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15) \
                                                                               \
   /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
   template(MethodHandle_klass,           java_lang_invoke_MethodHandle,     Pre_JSR292) \
   template(MemberName_klass,             java_lang_invoke_MemberName,       Pre_JSR292) \
   template(MethodHandleNatives_klass,    java_lang_invoke_MethodHandleNatives, Pre_JSR292) \
   template(AdapterMethodHandle_klass,    java_lang_invoke_AdapterMethodHandle, Pre_JSR292) \
   template(BoundMethodHandle_klass,      java_lang_invoke_BoundMethodHandle, Pre_JSR292) \
   template(DirectMethodHandle_klass,     java_lang_invoke_DirectMethodHandle, Pre_JSR292) \
   template(MethodType_klass,             java_lang_invoke_MethodType,       Pre_JSR292) \
   template(MethodTypeForm_klass,         java_lang_invoke_MethodTypeForm,   Pre_JSR292) \
   template(WrongMethodTypeException_klass, java_lang_invoke_WrongMethodTypeException, Pre_JSR292) \
   template(CallSite_klass,               java_lang_invoke_CallSite,         Pre_JSR292) \
   /* Note: MethodHandle must be first, and CallSite last in group */          \
                                                                               \
   template(StringBuffer_klass,           java_lang_StringBuffer,         Pre) \
   template(StringBuilder_klass,          java_lang_StringBuilder,        Pre) \
                                                                               \
   /* It's NULL in non-1.4 JDKs. */                                            \
   template(StackTraceElement_klass,      java_lang_StackTraceElement,    Opt) \
   /* Universe::is_gte_jdk14x_version() is not set up by this point. */        \
   /* It's okay if this turns out to be NULL in non-1.4 JDKs. */               \
   template(java_nio_Buffer_klass,        java_nio_Buffer,                Opt) \
                                                                               \
   /* If this class isn't present, it won't be referenced. */                  \
   template(sun_misc_AtomicLongCSImpl_klass, sun_misc_AtomicLongCSImpl,   Opt) \
                                                                               \
   template(sun_jkernel_DownloadManager_klass, sun_jkernel_DownloadManager, Opt_Kernel) \
                                                                               \
   template(sun_misc_PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt)       \
                                                                               \
   /* Preload boxing klasses */                                                \
   template(Boolean_klass,                java_lang_Boolean,              Pre) \
   template(Character_klass,              java_lang_Character,            Pre) \
   template(Float_klass,                  java_lang_Float,                Pre) \
   template(Double_klass,                 java_lang_Double,               Pre) \
   template(Byte_klass,                   java_lang_Byte,                 Pre) \
   template(Short_klass,                  java_lang_Short,                Pre) \
   template(Integer_klass,                java_lang_Integer,              Pre) \
   template(Long_klass,                   java_lang_Long,                 Pre) \
   /*end*/
 class SystemDictionary : AllStatic {
   friend class VMStructs;
   friend class CompactingPermGenGen;
   friend class SystemDictionaryHandles;
   NOT_PRODUCT(friend class instanceKlassKlass;)
  public:
   enum WKID {
     NO_WKID = 0,
     #define WK_KLASS_ENUM(name, ignore_s, ignore_o) WK_KLASS_ENUM_NAME(name),
     WK_KLASSES_DO(WK_KLASS_ENUM)
     #undef WK_KLASS_ENUM
     WKID_LIMIT,
     FIRST_WKID = NO_WKID + 1
   };
   enum InitOption {
     Pre,                        // preloaded; error if not present
     Pre_JSR292,                 // preloaded if EnableInvokeDynamic
     // Order is significant.  Options before this point require resolve_or_fail.
     // Options after this point will use resolve_or_null instead.
     Opt,                        // preload tried; NULL if not present
     Opt_Only_JDK14NewRef,       // preload tried; use only with NewReflection
     Opt_Only_JDK15,             // preload tried; use only with JDK1.5+
     Opt_Kernel,                 // preload tried only #ifdef KERNEL
     OPTION_LIMIT,
     CEIL_LG_OPTION_LIMIT = 4    // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
   };
   // Returns a class with a given class name and class loader.  Loads the
   // class if needed. If not found a NoClassDefFoundError or a
   // ClassNotFoundException is thrown, depending on the value on the
   // throw_error flag.  For most uses the throw_error argument should be set
   // to true.
   static klassOop 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 klassOop resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
 private:
   // handle error translation for resolve_or_null results
   static klassOop handle_resolution_exception(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, KlassHandle klass_h, TRAPS);
 public:
   // Returns a class with a given class name and class loader.
   // Loads the class if needed. If not found NULL is returned.
   static klassOop resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
   // Version with null loader and protection domain
   static klassOop 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 klassOop resolve_super_or_fail(Symbol* child_name,
                                         Symbol* class_name,
                                         Handle class_loader,
                                         Handle protection_domain,
                                         bool is_superclass,
                                         TRAPS);
   // Parse new stream. This won't update the system dictionary or
   // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
   static klassOop parse_stream(Symbol* class_name,
                                Handle class_loader,
                                Handle protection_domain,
                                ClassFileStream* st,
                                TRAPS) {
     KlassHandle nullHandle;
     return parse_stream(class_name, class_loader, protection_domain, st, nullHandle, NULL, THREAD);
   }
   static klassOop parse_stream(Symbol* class_name,
                                Handle class_loader,
                                Handle protection_domain,
                                ClassFileStream* st,
                                KlassHandle host_klass,
                                GrowableArray<Handle>* cp_patches,
                                TRAPS);
   // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
   static klassOop resolve_from_stream(Symbol* class_name, Handle class_loader,
                                       Handle protection_domain,
                                       ClassFileStream* st, bool verify, TRAPS);
   // Lookup an already loaded class. If not found NULL is returned.
   static klassOop 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 klassOop find_instance_or_array_klass(Symbol* class_name,
                                                Handle class_loader,
                                                Handle protection_domain,
                                                TRAPS);
   // If the given name is known to vmSymbols, return the well-know klass:
   static klassOop find_well_known_klass(Symbol* class_name);
   // 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 klassOop find_constrained_instance_or_array_klass(Symbol* class_name,
                                                            Handle class_loader,
                                                            TRAPS);
   // Iterate over all klasses in dictionary
   //   Just the classes from defining class loaders
   static void classes_do(void f(klassOop));
   // Added for initialize_itable_for_klass to handle exceptions
   static void classes_do(void f(klassOop, TRAPS), TRAPS);
   //   All classes, and their class loaders
   static void classes_do(void f(klassOop, oop));
   //   All classes, and their class loaders
   //   (added for helpers that use HandleMarks and ResourceMarks)
   static void classes_do(void f(klassOop, oop, TRAPS), TRAPS);
   // All entries in the placeholder table and their class loaders
   static void placeholders_do(void f(Symbol*, oop));
   // Iterate over all methods in all klasses in dictionary
   static void methods_do(void f(methodOop));
   // Garbage collection support
   // This method applies "blk->do_oop" to all the pointers to "system"
   // classes and loaders.
   static void always_strong_oops_do(OopClosure* blk);
   static void always_strong_classes_do(OopClosure* blk);
   // This method applies "blk->do_oop" to all the placeholders.
   static void placeholders_do(OopClosure* blk);
   // Unload (that is, break root links to) all unmarked classes and
   // loaders.  Returns "true" iff something was unloaded.
   static bool do_unloading(BoolObjectClosure* is_alive);
   // Applies "f->do_oop" to all root oops in the system dictionary.
   static void oops_do(OopClosure* f);
   // System loader lock
   static oop system_loader_lock()           { return _system_loader_lock_obj; }
 private:
   //    Traverses preloaded oops: various system classes.  These are
   //    guaranteed to be in the perm gen.
   static void preloaded_oops_do(OopClosure* f);
   static void lazily_loaded_oops_do(OopClosure* f);
 public:
   // Sharing support.
   static void reorder_dictionary();
   static void copy_buckets(char** top, char* end);
   static void copy_table(char** top, char* end);
   static void reverse();
   static void set_shared_dictionary(HashtableBucket* t, int length,
                                     int number_of_entries);
   // Printing
   static void print()                   PRODUCT_RETURN;
   static void print_class_statistics()  PRODUCT_RETURN;
   static void print_method_statistics() PRODUCT_RETURN;
   // Number of contained klasses
   // This is both fully loaded classes and classes in the process
   // of being loaded
   static int number_of_classes();
   // Monotonically increasing counter which grows as classes are
   // loaded or modifications such as hot-swapping or setting/removing
   // of breakpoints are performed
   static inline int number_of_modifications()     { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
   // Needed by evolution and breakpoint code
   static inline void notice_modification()        { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications;      }
   // Verification
   static void verify();
 #ifdef ASSERT
   static bool is_internal_format(Symbol* class_name);
 #endif
   // Verify class is in dictionary
   static void verify_obj_klass_present(Handle obj,
                                        Symbol* class_name,
                                        Handle class_loader);
   // Initialization
   static void initialize(TRAPS);
   // Fast access to commonly used classes (preloaded)
   static klassOop check_klass(klassOop k) {
     assert(k != NULL, "preloaded klass not initialized");
     return k;
   }
   static klassOop check_klass_Pre(klassOop k) { return check_klass(k); }
   static klassOop check_klass_Pre_JSR292(klassOop k) { return EnableInvokeDynamic ? check_klass(k) : k; }
   static klassOop check_klass_Opt(klassOop k) { return k; }
   static klassOop check_klass_Opt_Kernel(klassOop k) { return k; } //== Opt
   static klassOop check_klass_Opt_Only_JDK15(klassOop k) {
     assert(JDK_Version::is_gte_jdk15x_version(), "JDK 1.5 only");
     return k;
   }
   static klassOop check_klass_Opt_Only_JDK14NewRef(klassOop k) {
     assert(JDK_Version::is_gte_jdk14x_version() && UseNewReflection, "JDK 1.4 only");
     // despite the optional loading, if you use this it must be present:
     return check_klass(k);
   }
   static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
   static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
   static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
     int limit = (int)end_id + 1;
     initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
   }
 public:
   #define WK_KLASS_DECLARE(name, ignore_symbol, option) \
     static klassOop name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); }
   WK_KLASSES_DO(WK_KLASS_DECLARE);
   #undef WK_KLASS_DECLARE
   // Local definition for direct access to the private array:
   #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
   static klassOop box_klass(BasicType t) {
     assert((uint)t < T_VOID+1, "range check");
     return check_klass(_box_klasses[t]);
   }
   static BasicType box_klass_type(klassOop k);  // inverse of box_klass
   // methods returning lazily loaded klasses
   // The corresponding method to load the class must be called before calling them.
   static klassOop abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
   static void load_abstract_ownable_synchronizer_klass(TRAPS);
 private:
   // Tells whether ClassLoader.loadClassInternal is present
   static bool has_loadClassInternal()       { return _has_loadClassInternal; }
 public:
   // Tells whether ClassLoader.checkPackageAccess is present
   static bool has_checkPackageAccess()      { return _has_checkPackageAccess; }
   static bool Class_klass_loaded()          { return WK_KLASS(Class_klass) != NULL; }
   static bool Cloneable_klass_loaded()      { return WK_KLASS(Cloneable_klass) != NULL; }
   // Returns default system loader
   static oop java_system_loader();
   // Compute the default system loader
   static void compute_java_system_loader(TRAPS);
 private:
   // 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 char* check_signature_loaders(Symbol* signature, Handle loader1,
                                        Handle loader2, bool is_method, TRAPS);
   // JSR 292
   // find the java.lang.invoke.MethodHandles::invoke method for a given signature
   static methodOop find_method_handle_invoke(Symbol* name,
                                              Symbol* signature,
                                              KlassHandle accessing_klass,
                                              TRAPS);
   // ask Java to compute a java.lang.invoke.MethodType object for a given signature
   static Handle    find_method_handle_type(Symbol* signature,
                                            KlassHandle accessing_klass,
                                            bool for_invokeGeneric,
                                            bool& return_bcp_flag,
                                            TRAPS);
   // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
   static Handle    link_method_handle_constant(KlassHandle caller,
                                                int ref_kind, //e.g., JVM_REF_invokeVirtual
                                                KlassHandle callee,
                                                Symbol* name,
                                                Symbol* signature,
                                                TRAPS);
   // ask Java to create a dynamic call site, while linking an invokedynamic op
   static Handle    make_dynamic_call_site(Handle bootstrap_method,
                                           // Callee information:
                                           Symbol* name,
                                           methodHandle signature_invoker,
                                           Handle info,
                                           // Caller information:
                                           methodHandle caller_method,
                                           int caller_bci,
                                           TRAPS);
   // coordinate with Java about bootstrap methods
   static Handle    find_bootstrap_method(methodHandle caller_method,
                                          int caller_bci,  // N.B. must be an invokedynamic
                                          int cache_index, // must be corresponding main_entry
                                          Handle &argument_info_result, // static BSM arguments, if any
                                          TRAPS);
   // Utility for printing loader "name" as part of tracing constraints
   static const char* loader_name(oop loader) {
     return ((loader) == NULL ? "<bootloader>" :
             instanceKlass::cast((loader)->klass())->name()->as_C_string() );
   }
   // Record the error when the first attempt to resolve a reference from a constant
   // pool entry to a class fails.
   static void add_resolution_error(constantPoolHandle pool, int which, Symbol* error);
   static Symbol* find_resolution_error(constantPoolHandle pool, int which);
  private:
   enum Constants {
     _loader_constraint_size = 107,                     // number of entries in constraint table
     _resolution_error_size  = 107,                     // number of entries in resolution error table
     _invoke_method_size     = 139,                     // number of entries in invoke method table
     _nof_buckets            = 1009                     // number of buckets in hash table
   };
   // Static variables
   // Hashtable holding loaded classes.
   static Dictionary*            _dictionary;
   // Hashtable holding placeholders for classes being loaded.
   static PlaceholderTable*       _placeholders;
   // Hashtable holding classes from the shared archive.
   static Dictionary*             _shared_dictionary;
   // Monotonically increasing counter which grows with
   // _number_of_classes as well as hot-swapping and breakpoint setting
   // and removal.
   static int                     _number_of_modifications;
   // Lock object for system class loader
   static oop                     _system_loader_lock_obj;
   // Constraints on class loaders
   static LoaderConstraintTable*  _loader_constraints;
   // Resolution errors
   static ResolutionErrorTable*   _resolution_errors;
   // Invoke methods (JSR 292)
   static SymbolPropertyTable*    _invoke_method_table;
 public:
   // for VM_CounterDecay iteration support
   friend class CounterDecay;
   static klassOop try_get_next_class();
 private:
   static void validate_protection_domain(instanceKlassHandle klass,
                                          Handle class_loader,
                                          Handle protection_domain, TRAPS);
   friend class VM_PopulateDumpSharedSpace;
   friend class TraversePlaceholdersClosure;
   static Dictionary*         dictionary() { return _dictionary; }
   static Dictionary*         shared_dictionary() { return _shared_dictionary; }
   static PlaceholderTable*   placeholders() { return _placeholders; }
   static LoaderConstraintTable* constraints() { return _loader_constraints; }
   static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
   static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
   // Basic loading operations
   static klassOop resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
   static klassOop resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
   static instanceKlassHandle handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
   // Wait on SystemDictionary_lock; unlocks lockObject before
   // waiting; relocks lockObject with correct recursion count
   // after waiting, but before reentering SystemDictionary_lock
   // to preserve lock order semantics.
   static void double_lock_wait(Handle lockObject, TRAPS);
   static void define_instance_class(instanceKlassHandle k, TRAPS);
   static instanceKlassHandle find_or_define_instance_class(Symbol* class_name,
                                                 Handle class_loader,
                                                 instanceKlassHandle k, TRAPS);
   static instanceKlassHandle load_shared_class(Symbol* class_name,
                                                Handle class_loader, TRAPS);
   static instanceKlassHandle load_shared_class(instanceKlassHandle ik,
                                                Handle class_loader, TRAPS);
   static instanceKlassHandle load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
   static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
   static void check_loader_lock_contention(Handle loader_lock, TRAPS);
   static bool is_parallelCapable(Handle class_loader);
   static bool is_parallelDefine(Handle class_loader);
   static klassOop find_shared_class(Symbol* class_name);
   // Setup link to hierarchy
   static void add_to_hierarchy(instanceKlassHandle k, TRAPS);
 private:
   // We pass in the hashtable index so we can calculate it outside of
   // the SystemDictionary_lock.
   // Basic find on loaded classes
   static klassOop find_class(int index, unsigned int hash,
                              Symbol* name, Handle loader);
   static klassOop find_class(Symbol* class_name, Handle class_loader);
   // Basic find on classes in the midst of being loaded
   static Symbol* find_placeholder(Symbol* name, Handle loader);
   // Updating entry in dictionary
   // Add a completely loaded class
   static void add_klass(int index, Symbol* class_name,
                         Handle class_loader, KlassHandle obj);
   // Add a placeholder for a class being loaded
   static void add_placeholder(int index,
                               Symbol* class_name,
                               Handle class_loader);
   static void remove_placeholder(int index,
                                  Symbol* class_name,
                                  Handle class_loader);
   // Performs cleanups after resolve_super_or_fail. This typically needs
   // to be called on failure.
   // Won't throw, but can block.
   static void resolution_cleanups(Symbol* class_name,
                                   Handle class_loader,
                                   TRAPS);
   // Initialization
   static void initialize_preloaded_classes(TRAPS);
   // Class loader constraints
   static void check_constraints(int index, unsigned int hash,
                                 instanceKlassHandle k, Handle loader,
                                 bool defining, TRAPS);
   static void update_dictionary(int d_index, unsigned int d_hash,
                                 int p_index, unsigned int p_hash,
                                 instanceKlassHandle k, Handle loader, TRAPS);
   // Variables holding commonly used klasses (preloaded)
   static klassOop _well_known_klasses[];
   // Lazily loaded klasses
   static volatile klassOop _abstract_ownable_synchronizer_klass;
   // table of box klasses (int_klass, etc.)
   static klassOop _box_klasses[T_VOID+1];
   static oop  _java_system_loader;
   static bool _has_loadClassInternal;
   static bool _has_checkPackageAccess;
 };
 class SystemDictionaryHandles : AllStatic {
 public:
   #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
     static KlassHandle name() { \
       SystemDictionary::name(); \
       klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
       return KlassHandle(loc, true); \
     }
   WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
   #undef WK_KLASS_HANDLE_DECLARE
   static KlassHandle box_klass(BasicType t);
 };
 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/classfile/systemDictionary.hpp@688202ef6306 (annotated)

src/share/vm/classfile/systemDictionary.hpp