rev 50307 : [mq]: cont

   1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
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  24 
  25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
  26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
  27 
  28 #include "classfile/classLoader.hpp"
  29 #include "jvmci/systemDictionary_jvmci.hpp"
  30 #include "oops/objArrayOop.hpp"
  31 #include "oops/symbol.hpp"
  32 #include "runtime/java.hpp"
  33 #include "runtime/reflectionUtils.hpp"
  34 #include "runtime/signature.hpp"
  35 #include "utilities/hashtable.hpp"
  36 
  37 // The dictionary in each ClassLoaderData stores all loaded classes, either
  38 // initiatied by its class loader or defined by its class loader:
  39 //
  40 //   class loader -> ClassLoaderData -> [class, protection domain set]
  41 //
  42 // Classes are loaded lazily. The default VM class loader is
  43 // represented as NULL.
  44 
  45 // The underlying data structure is an open hash table (Dictionary) per
  46 // ClassLoaderData with a fixed number of buckets. During loading the
  47 // class loader object is locked, (for the VM loader a private lock object is used).
  48 // The global SystemDictionary_lock is held for all additions into the ClassLoaderData
  49 // dictionaries.  TODO: fix lock granularity so that class loading can
  50 // be done concurrently, but only by different loaders.
  51 //
  52 // During loading a placeholder (name, loader) is temporarily placed in
  53 // a side data structure, and is used to detect ClassCircularityErrors
  54 // and to perform verification during GC.  A GC can occur in the midst
  55 // of class loading, as we call out to Java, have to take locks, etc.
  56 //
  57 // When class loading is finished, a new entry is added to the dictionary
  58 // of the class loader and the placeholder is removed. Note that the protection
  59 // domain field of the dictionary entry has not yet been filled in when
  60 // the "real" dictionary entry is created.
  61 //
  62 // Clients of this class who are interested in finding if a class has
  63 // been completely loaded -- not classes in the process of being loaded --
  64 // can read the dictionary unlocked. This is safe because
  65 //    - entries are only deleted at safepoints
  66 //    - readers cannot come to a safepoint while actively examining
  67 //         an entry  (an entry cannot be deleted from under a reader)
  68 //    - entries must be fully formed before they are available to concurrent
  69 //         readers (we must ensure write ordering)
  70 //
  71 // Note that placeholders are deleted at any time, as they are removed
  72 // when a class is completely loaded. Therefore, readers as well as writers
  73 // of placeholders must hold the SystemDictionary_lock.
  74 //
  75 
  76 class ClassFileStream;
  77 class Dictionary;
  78 class PlaceholderTable;
  79 class LoaderConstraintTable;
  80 template <MEMFLAGS F> class HashtableBucket;
  81 class ResolutionErrorTable;
  82 class SymbolPropertyTable;
  83 class ProtectionDomainCacheTable;
  84 class ProtectionDomainCacheEntry;
  85 class GCTimer;
  86 class OopStorage;
  87 
  88 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
  89 // They are all "well-known", in the sense that no class loader is allowed
  90 // to provide a different definition.
  91 //
  92 // These klasses must all have names defined in vmSymbols.
  93 
  94 #define WK_KLASS_ENUM_NAME(kname)    kname##_knum
  95 
  96 // Each well-known class has a short klass name (like object_klass),
  97 // a vmSymbol name (like java_lang_Object), and a flag word
  98 // that makes some minor distinctions, like whether the klass
  99 // is preloaded, optional, release-specific, etc.
 100 // The order of these definitions is significant; it is the order in which
 101 // preloading is actually performed by initialize_preloaded_classes.
 102 
 103 #define WK_KLASSES_DO(do_klass)                                                                                          \
 104   /* well-known classes */                                                                                               \
 105   do_klass(Object_klass,                                java_lang_Object,                          Pre                 ) \
 106   do_klass(String_klass,                                java_lang_String,                          Pre                 ) \
 107   do_klass(Class_klass,                                 java_lang_Class,                           Pre                 ) \
 108   do_klass(Cloneable_klass,                             java_lang_Cloneable,                       Pre                 ) \
 109   do_klass(ClassLoader_klass,                           java_lang_ClassLoader,                     Pre                 ) \
 110   do_klass(Serializable_klass,                          java_io_Serializable,                      Pre                 ) \
 111   do_klass(System_klass,                                java_lang_System,                          Pre                 ) \
 112   do_klass(Throwable_klass,                             java_lang_Throwable,                       Pre                 ) \
 113   do_klass(Error_klass,                                 java_lang_Error,                           Pre                 ) \
 114   do_klass(ThreadDeath_klass,                           java_lang_ThreadDeath,                     Pre                 ) \
 115   do_klass(Exception_klass,                             java_lang_Exception,                       Pre                 ) \
 116   do_klass(RuntimeException_klass,                      java_lang_RuntimeException,                Pre                 ) \
 117   do_klass(SecurityManager_klass,                       java_lang_SecurityManager,                 Pre                 ) \
 118   do_klass(ProtectionDomain_klass,                      java_security_ProtectionDomain,            Pre                 ) \
 119   do_klass(AccessControlContext_klass,                  java_security_AccessControlContext,        Pre                 ) \
 120   do_klass(SecureClassLoader_klass,                     java_security_SecureClassLoader,           Pre                 ) \
 121   do_klass(ClassNotFoundException_klass,                java_lang_ClassNotFoundException,          Pre                 ) \
 122   do_klass(NoClassDefFoundError_klass,                  java_lang_NoClassDefFoundError,            Pre                 ) \
 123   do_klass(LinkageError_klass,                          java_lang_LinkageError,                    Pre                 ) \
 124   do_klass(ClassCastException_klass,                    java_lang_ClassCastException,              Pre                 ) \
 125   do_klass(ArrayStoreException_klass,                   java_lang_ArrayStoreException,             Pre                 ) \
 126   do_klass(VirtualMachineError_klass,                   java_lang_VirtualMachineError,             Pre                 ) \
 127   do_klass(OutOfMemoryError_klass,                      java_lang_OutOfMemoryError,                Pre                 ) \
 128   do_klass(StackOverflowError_klass,                    java_lang_StackOverflowError,              Pre                 ) \
 129   do_klass(IllegalMonitorStateException_klass,          java_lang_IllegalMonitorStateException,    Pre                 ) \
 130   do_klass(Reference_klass,                             java_lang_ref_Reference,                   Pre                 ) \
 131                                                                                                                          \
 132   /* Preload ref klasses and set reference types */                                                                      \
 133   do_klass(SoftReference_klass,                         java_lang_ref_SoftReference,               Pre                 ) \
 134   do_klass(WeakReference_klass,                         java_lang_ref_WeakReference,               Pre                 ) \
 135   do_klass(FinalReference_klass,                        java_lang_ref_FinalReference,              Pre                 ) \
 136   do_klass(PhantomReference_klass,                      java_lang_ref_PhantomReference,            Pre                 ) \
 137   do_klass(Finalizer_klass,                             java_lang_ref_Finalizer,                   Pre                 ) \
 138                                                                                                                          \
 139   do_klass(Thread_klass,                                java_lang_Thread,                          Pre                 ) \
 140   do_klass(ThreadGroup_klass,                           java_lang_ThreadGroup,                     Pre                 ) \
 141   do_klass(Properties_klass,                            java_util_Properties,                      Pre                 ) \
 142   do_klass(Module_klass,                                java_lang_Module,                          Pre                 ) \
 143   do_klass(reflect_AccessibleObject_klass,              java_lang_reflect_AccessibleObject,        Pre                 ) \
 144   do_klass(reflect_Field_klass,                         java_lang_reflect_Field,                   Pre                 ) \
 145   do_klass(reflect_Parameter_klass,                     java_lang_reflect_Parameter,               Opt                 ) \
 146   do_klass(reflect_Method_klass,                        java_lang_reflect_Method,                  Pre                 ) \
 147   do_klass(reflect_Constructor_klass,                   java_lang_reflect_Constructor,             Pre                 ) \
 148                                                                                                                          \
 149   do_klass(Runnable_klass,                              java_lang_Runnable,                        Pre                 ) \
 150   do_klass(ContinuationScope_klass,                     java_lang_ContinuationScope,               Pre                 ) \
 151   do_klass(Continuation_klass,                          java_lang_Continuation,                    Pre                 ) \
 152                                                                                                                          \
 153   /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */                              \
 154   /* It's okay if this turns out to be NULL in non-1.4 JDKs. */                                                          \
 155   do_klass(reflect_MagicAccessorImpl_klass,             reflect_MagicAccessorImpl,                 Opt                 ) \
 156   do_klass(reflect_MethodAccessorImpl_klass,            reflect_MethodAccessorImpl,                Pre                 ) \
 157   do_klass(reflect_ConstructorAccessorImpl_klass,       reflect_ConstructorAccessorImpl,           Pre                 ) \
 158   do_klass(reflect_DelegatingClassLoader_klass,         reflect_DelegatingClassLoader,             Opt                 ) \
 159   do_klass(reflect_ConstantPool_klass,                  reflect_ConstantPool,                      Opt                 ) \
 160   do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, reflect_UnsafeStaticFieldAccessorImpl,     Opt                 ) \
 161   do_klass(reflect_CallerSensitive_klass,               reflect_CallerSensitive,                   Opt                 ) \
 162                                                                                                                          \
 163   /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */                                            \
 164   do_klass(DirectMethodHandle_klass,                    java_lang_invoke_DirectMethodHandle,       Opt                 ) \
 165   do_klass(MethodHandle_klass,                          java_lang_invoke_MethodHandle,             Pre                 ) \
 166   do_klass(VarHandle_klass,                             java_lang_invoke_VarHandle,                Pre                 ) \
 167   do_klass(MemberName_klass,                            java_lang_invoke_MemberName,               Pre                 ) \
 168   do_klass(ResolvedMethodName_klass,                    java_lang_invoke_ResolvedMethodName,       Pre                 ) \
 169   do_klass(MethodHandleNatives_klass,                   java_lang_invoke_MethodHandleNatives,      Pre                 ) \
 170   do_klass(LambdaForm_klass,                            java_lang_invoke_LambdaForm,               Opt                 ) \
 171   do_klass(MethodType_klass,                            java_lang_invoke_MethodType,               Pre                 ) \
 172   do_klass(BootstrapMethodError_klass,                  java_lang_BootstrapMethodError,            Pre                 ) \
 173   do_klass(CallSite_klass,                              java_lang_invoke_CallSite,                 Pre                 ) \
 174   do_klass(Context_klass,                               java_lang_invoke_MethodHandleNatives_CallSiteContext, Pre      ) \
 175   do_klass(ConstantCallSite_klass,                      java_lang_invoke_ConstantCallSite,         Pre                 ) \
 176   do_klass(MutableCallSite_klass,                       java_lang_invoke_MutableCallSite,          Pre                 ) \
 177   do_klass(VolatileCallSite_klass,                      java_lang_invoke_VolatileCallSite,         Pre                 ) \
 178   /* Note: MethodHandle must be first, and VolatileCallSite last in group */                                             \
 179                                                                                                                          \
 180   do_klass(AssertionStatusDirectives_klass,             java_lang_AssertionStatusDirectives,       Pre                 ) \
 181   do_klass(StringBuffer_klass,                          java_lang_StringBuffer,                    Pre                 ) \
 182   do_klass(StringBuilder_klass,                         java_lang_StringBuilder,                   Pre                 ) \
 183   do_klass(internal_Unsafe_klass,                       jdk_internal_misc_Unsafe,                  Pre                 ) \
 184   do_klass(module_Modules_klass,                        jdk_internal_module_Modules,               Pre                 ) \
 185                                                                                                                          \
 186   /* support for CDS */                                                                                                  \
 187   do_klass(ByteArrayInputStream_klass,                  java_io_ByteArrayInputStream,              Pre                 ) \
 188   do_klass(URL_klass,                                   java_net_URL,                              Pre                 ) \
 189   do_klass(Jar_Manifest_klass,                          java_util_jar_Manifest,                    Pre                 ) \
 190   do_klass(jdk_internal_loader_ClassLoaders_klass,      jdk_internal_loader_ClassLoaders,          Pre                 ) \
 191   do_klass(jdk_internal_loader_ClassLoaders_AppClassLoader_klass,      jdk_internal_loader_ClassLoaders_AppClassLoader,       Pre ) \
 192   do_klass(jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass, jdk_internal_loader_ClassLoaders_PlatformClassLoader,  Pre ) \
 193   do_klass(CodeSource_klass,                            java_security_CodeSource,                  Pre                 ) \
 194                                                                                                                          \
 195   do_klass(StackTraceElement_klass,                     java_lang_StackTraceElement,               Opt                 ) \
 196                                                                                                                          \
 197   /* It's okay if this turns out to be NULL in non-1.4 JDKs. */                                                          \
 198   do_klass(nio_Buffer_klass,                            java_nio_Buffer,                           Opt                 ) \
 199                                                                                                                          \
 200   /* Stack Walking */                                                                                                    \
 201   do_klass(StackWalker_klass,                           java_lang_StackWalker,                     Opt                 ) \
 202   do_klass(AbstractStackWalker_klass,                   java_lang_StackStreamFactory_AbstractStackWalker, Opt          ) \
 203   do_klass(StackFrameInfo_klass,                        java_lang_StackFrameInfo,                  Opt                 ) \
 204   do_klass(LiveStackFrameInfo_klass,                    java_lang_LiveStackFrameInfo,              Opt                 ) \
 205                                                                                                                          \
 206   /* Preload boxing klasses */                                                                                           \
 207   do_klass(Boolean_klass,                               java_lang_Boolean,                         Pre                 ) \
 208   do_klass(Character_klass,                             java_lang_Character,                       Pre                 ) \
 209   do_klass(Float_klass,                                 java_lang_Float,                           Pre                 ) \
 210   do_klass(Double_klass,                                java_lang_Double,                          Pre                 ) \
 211   do_klass(Byte_klass,                                  java_lang_Byte,                            Pre                 ) \
 212   do_klass(Short_klass,                                 java_lang_Short,                           Pre                 ) \
 213   do_klass(Integer_klass,                               java_lang_Integer,                         Pre                 ) \
 214   do_klass(Long_klass,                                  java_lang_Long,                            Pre                 ) \
 215                                                                                                                          \
 216   /* JVMCI classes. These are loaded on-demand. */                                                                       \
 217   JVMCI_WK_KLASSES_DO(do_klass)                                                                                          \
 218                                                                                                                          \
 219   /*end*/
 220 
 221 
 222 class SystemDictionary : AllStatic {
 223   friend class VMStructs;
 224   friend class SystemDictionaryHandles;
 225 
 226  public:
 227   enum WKID {
 228     NO_WKID = 0,
 229 
 230     #define WK_KLASS_ENUM(name, symbol, ignore_o) WK_KLASS_ENUM_NAME(name), WK_KLASS_ENUM_NAME(symbol) = WK_KLASS_ENUM_NAME(name),
 231     WK_KLASSES_DO(WK_KLASS_ENUM)
 232     #undef WK_KLASS_ENUM
 233 
 234     WKID_LIMIT,
 235 
 236 #if INCLUDE_JVMCI
 237     FIRST_JVMCI_WKID = WK_KLASS_ENUM_NAME(JVMCI_klass),
 238     LAST_JVMCI_WKID  = WK_KLASS_ENUM_NAME(Value_klass),
 239 #endif
 240 
 241     FIRST_WKID = NO_WKID + 1
 242   };
 243 
 244   enum InitOption {
 245     Pre,                        // preloaded; error if not present
 246 
 247     // Order is significant.  Options before this point require resolve_or_fail.
 248     // Options after this point will use resolve_or_null instead.
 249 
 250     Opt,                        // preload tried; NULL if not present
 251 #if INCLUDE_JVMCI
 252     Jvmci,                      // preload tried; error if not present if JVMCI enabled
 253 #endif
 254     OPTION_LIMIT,
 255     CEIL_LG_OPTION_LIMIT = 2    // OPTION_LIMIT <= (1<<CEIL_LG_OPTION_LIMIT)
 256   };
 257 
 258 
 259   // Returns a class with a given class name and class loader.  Loads the
 260   // class if needed. If not found a NoClassDefFoundError or a
 261   // ClassNotFoundException is thrown, depending on the value on the
 262   // throw_error flag.  For most uses the throw_error argument should be set
 263   // to true.
 264 
 265   static Klass* resolve_or_fail(Symbol* class_name, Handle class_loader, Handle protection_domain, bool throw_error, TRAPS);
 266   // Convenient call for null loader and protection domain.
 267   static Klass* resolve_or_fail(Symbol* class_name, bool throw_error, TRAPS);
 268 protected:
 269   // handle error translation for resolve_or_null results
 270   static Klass* handle_resolution_exception(Symbol* class_name, bool throw_error, Klass* klass, TRAPS);
 271 
 272 public:
 273 
 274   // Returns a class with a given class name and class loader.
 275   // Loads the class if needed. If not found NULL is returned.
 276   static Klass* resolve_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
 277   // Version with null loader and protection domain
 278   static Klass* resolve_or_null(Symbol* class_name, TRAPS);
 279 
 280   // Resolve a superclass or superinterface. Called from ClassFileParser,
 281   // parse_interfaces, resolve_instance_class_or_null, load_shared_class
 282   // "child_name" is the class whose super class or interface is being resolved.
 283   static Klass* resolve_super_or_fail(Symbol* child_name,
 284                                       Symbol* class_name,
 285                                       Handle class_loader,
 286                                       Handle protection_domain,
 287                                       bool is_superclass,
 288                                       TRAPS);
 289 
 290   // Parse new stream. This won't update the dictionary or
 291   // class hierarchy, simply parse the stream. Used by JVMTI RedefineClasses.
 292   // Also used by Unsafe_DefineAnonymousClass
 293   static InstanceKlass* parse_stream(Symbol* class_name,
 294                                      Handle class_loader,
 295                                      Handle protection_domain,
 296                                      ClassFileStream* st,
 297                                      TRAPS) {
 298     return parse_stream(class_name,
 299                         class_loader,
 300                         protection_domain,
 301                         st,
 302                         NULL, // host klass
 303                         NULL, // cp_patches
 304                         THREAD);
 305   }
 306   static InstanceKlass* parse_stream(Symbol* class_name,
 307                                      Handle class_loader,
 308                                      Handle protection_domain,
 309                                      ClassFileStream* st,
 310                                      const InstanceKlass* host_klass,
 311                                      GrowableArray<Handle>* cp_patches,
 312                                      TRAPS);
 313 
 314   // Resolve from stream (called by jni_DefineClass and JVM_DefineClass)
 315   static InstanceKlass* resolve_from_stream(Symbol* class_name,
 316                                             Handle class_loader,
 317                                             Handle protection_domain,
 318                                             ClassFileStream* st,
 319                                             TRAPS);
 320 
 321   // Lookup an already loaded class. If not found NULL is returned.
 322   static Klass* find(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
 323 
 324   // Lookup an already loaded instance or array class.
 325   // Do not make any queries to class loaders; consult only the cache.
 326   // If not found NULL is returned.
 327   static Klass* find_instance_or_array_klass(Symbol* class_name,
 328                                                Handle class_loader,
 329                                                Handle protection_domain,
 330                                                TRAPS);
 331 
 332   // Lookup an instance or array class that has already been loaded
 333   // either into the given class loader, or else into another class
 334   // loader that is constrained (via loader constraints) to produce
 335   // a consistent class.  Do not take protection domains into account.
 336   // Do not make any queries to class loaders; consult only the cache.
 337   // Return NULL if the class is not found.
 338   //
 339   // This function is a strict superset of find_instance_or_array_klass.
 340   // This function (the unchecked version) makes a conservative prediction
 341   // of the result of the checked version, assuming successful lookup.
 342   // If both functions return non-null, they must return the same value.
 343   // Also, the unchecked version may sometimes be non-null where the
 344   // checked version is null.  This can occur in several ways:
 345   //   1. No query has yet been made to the class loader.
 346   //   2. The class loader was queried, but chose not to delegate.
 347   //   3. ClassLoader.checkPackageAccess rejected a proposed protection domain.
 348   //   4. Loading was attempted, but there was a linkage error of some sort.
 349   // In all of these cases, the loader constraints on this type are
 350   // satisfied, and it is safe for classes in the given class loader
 351   // to manipulate strongly-typed values of the found class, subject
 352   // to local linkage and access checks.
 353   static Klass* find_constrained_instance_or_array_klass(Symbol* class_name,
 354                                                            Handle class_loader,
 355                                                            TRAPS);
 356 
 357   static void classes_do(MetaspaceClosure* it);
 358   // Iterate over all methods in all klasses
 359 
 360   static void methods_do(void f(Method*));
 361 
 362   // Garbage collection support
 363 
 364   // Unload (that is, break root links to) all unmarked classes and
 365   // loaders.  Returns "true" iff something was unloaded.
 366   static bool do_unloading(GCTimer* gc_timer,
 367                            bool do_cleaning = true);
 368 
 369   // Used by DumpSharedSpaces only to remove classes that failed verification
 370   static void remove_classes_in_error_state();
 371 
 372   static int calculate_systemdictionary_size(int loadedclasses);
 373 
 374   // Applies "f->do_oop" to all root oops in the system dictionary.
 375   static void oops_do(OopClosure* f);
 376 
 377   // System loader lock
 378   static oop system_loader_lock()           { return _system_loader_lock_obj; }
 379 
 380 public:
 381   // Sharing support.
 382   static void reorder_dictionary_for_sharing() NOT_CDS_RETURN;
 383   static void combine_shared_dictionaries();
 384   static size_t count_bytes_for_buckets();
 385   static size_t count_bytes_for_table();
 386   static void copy_buckets(char* top, char* end);
 387   static void copy_table(char* top, char* end);
 388   static void set_shared_dictionary(HashtableBucket<mtClass>* t, int length,
 389                                     int number_of_entries);
 390   // Printing
 391   static void print() { return print_on(tty); }
 392   static void print_on(outputStream* st);
 393   static void print_shared(outputStream* st);
 394   static void dump(outputStream* st, bool verbose);
 395 
 396   // Monotonically increasing counter which grows as classes are
 397   // loaded or modifications such as hot-swapping or setting/removing
 398   // of breakpoints are performed
 399   static inline int number_of_modifications()     { assert_locked_or_safepoint(Compile_lock); return _number_of_modifications; }
 400   // Needed by evolution and breakpoint code
 401   static inline void notice_modification()        { assert_locked_or_safepoint(Compile_lock); ++_number_of_modifications;      }
 402 
 403   // Verification
 404   static void verify();
 405 
 406   // Initialization
 407   static void initialize(TRAPS);
 408 
 409   // Checked fast access to commonly used classes - mostly preloaded
 410   static InstanceKlass* check_klass(InstanceKlass* k) {
 411     assert(k != NULL, "klass not loaded");
 412     return k;
 413   }
 414 
 415   static InstanceKlass* check_klass_Pre(InstanceKlass* k) { return check_klass(k); }
 416   static InstanceKlass* check_klass_Opt(InstanceKlass* k) { return k; }
 417 
 418   JVMCI_ONLY(static InstanceKlass* check_klass_Jvmci(InstanceKlass* k) { return k; })
 419 
 420   static bool initialize_wk_klass(WKID id, int init_opt, TRAPS);
 421   static void initialize_wk_klasses_until(WKID limit_id, WKID &start_id, TRAPS);
 422   static void initialize_wk_klasses_through(WKID end_id, WKID &start_id, TRAPS) {
 423     int limit = (int)end_id + 1;
 424     initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
 425   }
 426 
 427 public:
 428   #define WK_KLASS_DECLARE(name, symbol, option) \
 429     static InstanceKlass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \
 430     static InstanceKlass** name##_addr() {                                                                       \
 431       return &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)];           \
 432     }
 433   WK_KLASSES_DO(WK_KLASS_DECLARE);
 434   #undef WK_KLASS_DECLARE
 435 
 436   static InstanceKlass* well_known_klass(WKID id) {
 437     assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
 438     return _well_known_klasses[id];
 439   }
 440 
 441   static InstanceKlass** well_known_klass_addr(WKID id) {
 442     assert(id >= (int)FIRST_WKID && id < (int)WKID_LIMIT, "oob");
 443     return &_well_known_klasses[id];
 444   }
 445   static void well_known_klasses_do(MetaspaceClosure* it);
 446 
 447   // Local definition for direct access to the private array:
 448   #define WK_KLASS(name) _well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]
 449 
 450   static InstanceKlass* box_klass(BasicType t) {
 451     assert((uint)t < T_VOID+1, "range check");
 452     return check_klass(_box_klasses[t]);
 453   }
 454   static BasicType box_klass_type(Klass* k);  // inverse of box_klass
 455 
 456   // methods returning lazily loaded klasses
 457   // The corresponding method to load the class must be called before calling them.
 458   static InstanceKlass* abstract_ownable_synchronizer_klass() { return check_klass(_abstract_ownable_synchronizer_klass); }
 459 
 460   static void load_abstract_ownable_synchronizer_klass(TRAPS);
 461 
 462 protected:
 463   // Returns the class loader data to be used when looking up/updating the
 464   // system dictionary.
 465   static ClassLoaderData *class_loader_data(Handle class_loader) {
 466     return ClassLoaderData::class_loader_data(class_loader());
 467   }
 468 
 469 public:
 470   // Tells whether ClassLoader.checkPackageAccess is present
 471   static bool has_checkPackageAccess()      { return _has_checkPackageAccess; }
 472 
 473   static bool Parameter_klass_loaded()      { return WK_KLASS(reflect_Parameter_klass) != NULL; }
 474   static bool Class_klass_loaded()          { return WK_KLASS(Class_klass) != NULL; }
 475   static bool Cloneable_klass_loaded()      { return WK_KLASS(Cloneable_klass) != NULL; }
 476   static bool Object_klass_loaded()         { return WK_KLASS(Object_klass) != NULL; }
 477   static bool ClassLoader_klass_loaded()    { return WK_KLASS(ClassLoader_klass) != NULL; }
 478 
 479   // Returns java system loader
 480   static oop java_system_loader();
 481 
 482   // Returns java platform loader
 483   static oop java_platform_loader();
 484 
 485   // Compute the java system and platform loaders
 486   static void compute_java_loaders(TRAPS);
 487 
 488   // Register a new class loader
 489   static ClassLoaderData* register_loader(Handle class_loader);
 490 protected:
 491   // Mirrors for primitive classes (created eagerly)
 492   static oop check_mirror(oop m) {
 493     assert(m != NULL, "mirror not initialized");
 494     return m;
 495   }
 496 
 497 public:
 498   // Note:  java_lang_Class::primitive_type is the inverse of java_mirror
 499 
 500   // Check class loader constraints
 501   static bool add_loader_constraint(Symbol* name, Handle loader1,
 502                                     Handle loader2, TRAPS);
 503   static Symbol* check_signature_loaders(Symbol* signature, Handle loader1,
 504                                          Handle loader2, bool is_method, TRAPS);
 505 
 506   // JSR 292
 507   // find a java.lang.invoke.MethodHandle.invoke* method for a given signature
 508   // (asks Java to compute it if necessary, except in a compiler thread)
 509   static methodHandle find_method_handle_invoker(Klass* klass,
 510                                                  Symbol* name,
 511                                                  Symbol* signature,
 512                                                  Klass* accessing_klass,
 513                                                  Handle *appendix_result,
 514                                                  Handle *method_type_result,
 515                                                  TRAPS);
 516   // for a given signature, find the internal MethodHandle method (linkTo* or invokeBasic)
 517   // (does not ask Java, since this is a low-level intrinsic defined by the JVM)
 518   static methodHandle find_method_handle_intrinsic(vmIntrinsics::ID iid,
 519                                                    Symbol* signature,
 520                                                    TRAPS);
 521 
 522   // compute java_mirror (java.lang.Class instance) for a type ("I", "[[B", "LFoo;", etc.)
 523   // Either the accessing_klass or the CL/PD can be non-null, but not both.
 524   static Handle    find_java_mirror_for_type(Symbol* signature,
 525                                              Klass* accessing_klass,
 526                                              Handle class_loader,
 527                                              Handle protection_domain,
 528                                              SignatureStream::FailureMode failure_mode,
 529                                              TRAPS);
 530   static Handle    find_java_mirror_for_type(Symbol* signature,
 531                                              Klass* accessing_klass,
 532                                              SignatureStream::FailureMode failure_mode,
 533                                              TRAPS) {
 534     // callee will fill in CL/PD from AK, if they are needed
 535     return find_java_mirror_for_type(signature, accessing_klass, Handle(), Handle(),
 536                                      failure_mode, THREAD);
 537   }
 538 
 539 
 540   // fast short-cut for the one-character case:
 541   static oop       find_java_mirror_for_type(char signature_char);
 542 
 543   // find a java.lang.invoke.MethodType object for a given signature
 544   // (asks Java to compute it if necessary, except in a compiler thread)
 545   static Handle    find_method_handle_type(Symbol* signature,
 546                                            Klass* accessing_klass,
 547                                            TRAPS);
 548 
 549   // find a java.lang.Class object for a given signature
 550   static Handle    find_field_handle_type(Symbol* signature,
 551                                           Klass* accessing_klass,
 552                                           TRAPS);
 553 
 554   // ask Java to compute a java.lang.invoke.MethodHandle object for a given CP entry
 555   static Handle    link_method_handle_constant(Klass* caller,
 556                                                int ref_kind, //e.g., JVM_REF_invokeVirtual
 557                                                Klass* callee,
 558                                                Symbol* name,
 559                                                Symbol* signature,
 560                                                TRAPS);
 561 
 562   // ask Java to compute a constant by invoking a BSM given a Dynamic_info CP entry
 563   static Handle    link_dynamic_constant(Klass* caller,
 564                                          int condy_index,
 565                                          Handle bootstrap_specifier,
 566                                          Symbol* name,
 567                                          Symbol* type,
 568                                          TRAPS);
 569 
 570   // ask Java to create a dynamic call site, while linking an invokedynamic op
 571   static methodHandle find_dynamic_call_site_invoker(Klass* caller,
 572                                                      int indy_index,
 573                                                      Handle bootstrap_method,
 574                                                      Symbol* name,
 575                                                      Symbol* type,
 576                                                      Handle *appendix_result,
 577                                                      Handle *method_type_result,
 578                                                      TRAPS);
 579 
 580   // Utility for printing loader "name" as part of tracing constraints
 581   static const char* loader_name(const oop loader);
 582   static const char* loader_name(const ClassLoaderData* loader_data);
 583 
 584   // Record the error when the first attempt to resolve a reference from a constant
 585   // pool entry to a class fails.
 586   static void add_resolution_error(const constantPoolHandle& pool, int which, Symbol* error,
 587                                    Symbol* message);
 588   static void delete_resolution_error(ConstantPool* pool);
 589   static Symbol* find_resolution_error(const constantPoolHandle& pool, int which,
 590                                        Symbol** message);
 591 
 592 
 593   static ProtectionDomainCacheEntry* cache_get(Handle protection_domain);
 594 
 595  protected:
 596 
 597   enum Constants {
 598     _loader_constraint_size = 107,                     // number of entries in constraint table
 599     _resolution_error_size  = 107,                     // number of entries in resolution error table
 600     _invoke_method_size     = 139,                     // number of entries in invoke method table
 601     _shared_dictionary_size = 1009,                    // number of entries in shared dictionary
 602     _placeholder_table_size = 1009                     // number of entries in hash table for placeholders
 603   };
 604 
 605 
 606   // Static tables owned by the SystemDictionary
 607 
 608   // Hashtable holding placeholders for classes being loaded.
 609   static PlaceholderTable*       _placeholders;
 610 
 611   // Hashtable holding classes from the shared archive.
 612   static Dictionary*             _shared_dictionary;
 613 
 614   // Monotonically increasing counter which grows with
 615   // loading classes as well as hot-swapping and breakpoint setting
 616   // and removal.
 617   static int                     _number_of_modifications;
 618 
 619   // Lock object for system class loader
 620   static oop                     _system_loader_lock_obj;
 621 
 622   // Constraints on class loaders
 623   static LoaderConstraintTable*  _loader_constraints;
 624 
 625   // Resolution errors
 626   static ResolutionErrorTable*   _resolution_errors;
 627 
 628   // Invoke methods (JSR 292)
 629   static SymbolPropertyTable*    _invoke_method_table;
 630 
 631   // ProtectionDomain cache
 632   static ProtectionDomainCacheTable*   _pd_cache_table;
 633 
 634   // VM weak OopStorage object.
 635   static OopStorage*             _vm_weak_oop_storage;
 636 
 637 protected:
 638   static void validate_protection_domain(InstanceKlass* klass,
 639                                          Handle class_loader,
 640                                          Handle protection_domain, TRAPS);
 641 
 642   friend class VM_PopulateDumpSharedSpace;
 643   friend class TraversePlaceholdersClosure;
 644   static Dictionary*         shared_dictionary() { return _shared_dictionary; }
 645   static PlaceholderTable*   placeholders() { return _placeholders; }
 646   static LoaderConstraintTable* constraints() { return _loader_constraints; }
 647   static ResolutionErrorTable* resolution_errors() { return _resolution_errors; }
 648   static SymbolPropertyTable* invoke_method_table() { return _invoke_method_table; }
 649 
 650   // Basic loading operations
 651   static Klass* resolve_instance_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
 652   static Klass* resolve_array_class_or_null(Symbol* class_name, Handle class_loader, Handle protection_domain, TRAPS);
 653   static InstanceKlass* handle_parallel_super_load(Symbol* class_name, Symbol* supername, Handle class_loader, Handle protection_domain, Handle lockObject, TRAPS);
 654   // Wait on SystemDictionary_lock; unlocks lockObject before
 655   // waiting; relocks lockObject with correct recursion count
 656   // after waiting, but before reentering SystemDictionary_lock
 657   // to preserve lock order semantics.
 658   static void double_lock_wait(Handle lockObject, TRAPS);
 659   static void define_instance_class(InstanceKlass* k, TRAPS);
 660   static InstanceKlass* find_or_define_instance_class(Symbol* class_name,
 661                                                 Handle class_loader,
 662                                                 InstanceKlass* k, TRAPS);
 663   static bool is_shared_class_visible(Symbol* class_name, InstanceKlass* ik,
 664                                       Handle class_loader, TRAPS);
 665   static InstanceKlass* load_shared_class(InstanceKlass* ik,
 666                                           Handle class_loader,
 667                                           Handle protection_domain,
 668                                           TRAPS);
 669   static InstanceKlass* load_instance_class(Symbol* class_name, Handle class_loader, TRAPS);
 670   static Handle compute_loader_lock_object(Handle class_loader, TRAPS);
 671   static void check_loader_lock_contention(Handle loader_lock, TRAPS);
 672   static bool is_parallelCapable(Handle class_loader);
 673   static bool is_parallelDefine(Handle class_loader);
 674 
 675 public:
 676   static InstanceKlass* load_shared_class(Symbol* class_name,
 677                                           Handle class_loader,
 678                                           TRAPS);
 679   static bool is_system_class_loader(oop class_loader);
 680   static bool is_platform_class_loader(oop class_loader);
 681   static void clear_invoke_method_table();
 682 
 683   // Returns TRUE if the method is a non-public member of class java.lang.Object.
 684   static bool is_nonpublic_Object_method(Method* m) {
 685     assert(m != NULL, "Unexpected NULL Method*");
 686     return !m->is_public() && m->method_holder() == SystemDictionary::Object_klass();
 687   }
 688 
 689   static void initialize_oop_storage();
 690   static OopStorage* vm_weak_oop_storage();
 691 
 692 protected:
 693   static InstanceKlass* find_shared_class(Symbol* class_name);
 694 
 695   // Setup link to hierarchy
 696   static void add_to_hierarchy(InstanceKlass* k, TRAPS);
 697 
 698   // Basic find on loaded classes
 699   static InstanceKlass* find_class(unsigned int hash,
 700                                    Symbol* name, Dictionary* dictionary);
 701   static InstanceKlass* find_class(Symbol* class_name, ClassLoaderData* loader_data);
 702 
 703   // Basic find on classes in the midst of being loaded
 704   static Symbol* find_placeholder(Symbol* name, ClassLoaderData* loader_data);
 705 
 706   // Add a placeholder for a class being loaded
 707   static void add_placeholder(int index,
 708                               Symbol* class_name,
 709                               ClassLoaderData* loader_data);
 710   static void remove_placeholder(int index,
 711                                  Symbol* class_name,
 712                                  ClassLoaderData* loader_data);
 713 
 714   // Performs cleanups after resolve_super_or_fail. This typically needs
 715   // to be called on failure.
 716   // Won't throw, but can block.
 717   static void resolution_cleanups(Symbol* class_name,
 718                                   ClassLoaderData* loader_data,
 719                                   TRAPS);
 720 
 721   // Initialization
 722   static void initialize_preloaded_classes(TRAPS);
 723 
 724   // Class loader constraints
 725   static void check_constraints(unsigned int hash,
 726                                 InstanceKlass* k, Handle loader,
 727                                 bool defining, TRAPS);
 728   static void update_dictionary(unsigned int d_hash,
 729                                 int p_index, unsigned int p_hash,
 730                                 InstanceKlass* k, Handle loader,
 731                                 TRAPS);
 732 
 733   // Variables holding commonly used klasses (preloaded)
 734   static InstanceKlass* _well_known_klasses[];
 735 
 736   // Lazily loaded klasses
 737   static InstanceKlass* volatile _abstract_ownable_synchronizer_klass;
 738 
 739   // table of box klasses (int_klass, etc.)
 740   static InstanceKlass* _box_klasses[T_VOID+1];
 741 
 742 private:
 743   static oop  _java_system_loader;
 744   static oop  _java_platform_loader;
 745 
 746   static bool _has_checkPackageAccess;
 747 };
 748 
 749 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
--- EOF ---