1 /*
   2  * Copyright (c) 1997, 2013, 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  *
  23  */
  24 
  25 #ifndef SHARE_VM_CLASSFILE_JAVACLASSES_HPP
  26 #define SHARE_VM_CLASSFILE_JAVACLASSES_HPP
  27 
  28 #include "classfile/systemDictionary.hpp"
  29 #include "jvmtifiles/jvmti.h"
  30 #include "oops/oop.hpp"
  31 #include "runtime/os.hpp"
  32 #include "utilities/utf8.hpp"
  33 
  34 // Interface for manipulating the basic Java classes.
  35 //
  36 // All dependencies on layout of actual Java classes should be kept here.
  37 // If the layout of any of the classes above changes the offsets must be adjusted.
  38 //
  39 // For most classes we hardwire the offsets for performance reasons. In certain
  40 // cases (e.g. java.security.AccessControlContext) we compute the offsets at
  41 // startup since the layout here differs between JDK1.2 and JDK1.3.
  42 //
  43 // Note that fields (static and non-static) are arranged with oops before non-oops
  44 // on a per class basis. The offsets below have to reflect this ordering.
  45 //
  46 // When editing the layouts please update the check_offset verification code
  47 // correspondingly. The names in the enums must be identical to the actual field
  48 // names in order for the verification code to work.
  49 
  50 
  51 // Interface to java.lang.String objects
  52 
  53 class java_lang_String : AllStatic {
  54  private:
  55   static int value_offset;
  56   static int offset_offset;
  57   static int count_offset;
  58   static int hash_offset;
  59 
  60   static bool initialized;
  61 
  62   static Handle basic_create(int length, TRAPS);
  63 
  64   static void set_value( oop string, typeArrayOop buffer) {
  65     assert(initialized, "Must be initialized");
  66     string->obj_field_put(value_offset,  (oop)buffer);
  67   }
  68   static void set_offset(oop string, int offset) {
  69     assert(initialized, "Must be initialized");
  70     if (offset_offset > 0) {
  71       string->int_field_put(offset_offset, offset);
  72     }
  73   }
  74   static void set_count( oop string, int count) {
  75     assert(initialized, "Must be initialized");
  76     if (count_offset > 0) {
  77       string->int_field_put(count_offset,  count);
  78     }
  79   }
  80 
  81  public:
  82   static void compute_offsets();
  83 
  84   // Instance creation
  85   static Handle create_from_unicode(jchar* unicode, int len, TRAPS);
  86   static oop    create_oop_from_unicode(jchar* unicode, int len, TRAPS);
  87   static Handle create_from_str(const char* utf8_str, TRAPS);
  88   static oop    create_oop_from_str(const char* utf8_str, TRAPS);
  89   static Handle create_from_symbol(Symbol* symbol, TRAPS);
  90   static Handle create_from_platform_dependent_str(const char* str, TRAPS);
  91   static Handle char_converter(Handle java_string, jchar from_char, jchar to_char, TRAPS);
  92 
  93   static bool has_offset_field()  {
  94     assert(initialized, "Must be initialized");
  95     return (offset_offset > 0);
  96   }
  97 
  98   static bool has_count_field()  {
  99     assert(initialized, "Must be initialized");
 100     return (count_offset > 0);
 101   }
 102 
 103   static bool has_hash_field()  {
 104     assert(initialized, "Must be initialized");
 105     return (hash_offset > 0);
 106   }
 107 
 108   static int value_offset_in_bytes()  {
 109     assert(initialized && (value_offset > 0), "Must be initialized");
 110     return value_offset;
 111   }
 112   static int count_offset_in_bytes()  {
 113     assert(initialized && (count_offset > 0), "Must be initialized");
 114     return count_offset;
 115   }
 116   static int offset_offset_in_bytes() {
 117     assert(initialized && (offset_offset > 0), "Must be initialized");
 118     return offset_offset;
 119   }
 120   static int hash_offset_in_bytes()   {
 121     assert(initialized && (hash_offset > 0), "Must be initialized");
 122     return hash_offset;
 123   }
 124 
 125   // Accessors
 126   static typeArrayOop value(oop java_string) {
 127     assert(initialized && (value_offset > 0), "Must be initialized");
 128     assert(is_instance(java_string), "must be java_string");
 129     return (typeArrayOop) java_string->obj_field(value_offset);
 130   }
 131   static int offset(oop java_string) {
 132     assert(initialized, "Must be initialized");
 133     assert(is_instance(java_string), "must be java_string");
 134     if (offset_offset > 0) {
 135       return java_string->int_field(offset_offset);
 136     } else {
 137       return 0;
 138     }
 139   }
 140   static int length(oop java_string) {
 141     assert(initialized, "Must be initialized");
 142     assert(is_instance(java_string), "must be java_string");
 143     if (count_offset > 0) {
 144       return java_string->int_field(count_offset);
 145     } else {
 146       return ((typeArrayOop)java_string->obj_field(value_offset))->length();
 147     }
 148   }
 149   static int utf8_length(oop java_string);
 150 
 151   // String converters
 152   static char*  as_utf8_string(oop java_string);
 153   static char*  as_utf8_string(oop java_string, char* buf, int buflen);
 154   static char*  as_utf8_string(oop java_string, int start, int len);
 155   static char*  as_platform_dependent_str(Handle java_string, TRAPS);
 156   static jchar* as_unicode_string(oop java_string, int& length);
 157   // produce an ascii string with all other values quoted using \u####
 158   static char*  as_quoted_ascii(oop java_string);
 159 
 160   // Compute the hash value for a java.lang.String object which would
 161   // contain the characters passed in.
 162   //
 163   // As the hash value used by the String object itself, in
 164   // String.hashCode().  This value is normally calculated in Java code
 165   // in the String.hashCode method(), but is precomputed for String
 166   // objects in the shared archive file.
 167   // hash P(31) from Kernighan & Ritchie
 168   //
 169   // For this reason, THIS ALGORITHM MUST MATCH String.hashCode().
 170   template <typename T> static unsigned int hash_code(T* s, int len) {
 171     unsigned int h = 0;
 172     while (len-- > 0) {
 173       h = 31*h + (unsigned int) *s;
 174       s++;
 175     }
 176     return h;
 177   }
 178   static unsigned int hash_code(oop java_string);
 179 
 180   // This is the string hash code used by the StringTable, which may be
 181   // the same as String.hashCode or an alternate hash code.
 182   static unsigned int hash_string(oop java_string);
 183 
 184   static bool equals(oop java_string, jchar* chars, int len);
 185 
 186   // Conversion between '.' and '/' formats
 187   static Handle externalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '/', '.', THREAD); }
 188   static Handle internalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '.', '/', THREAD); }
 189 
 190   // Conversion
 191   static Symbol* as_symbol(Handle java_string, TRAPS);
 192   static Symbol* as_symbol_or_null(oop java_string);
 193 
 194   // Testers
 195   static bool is_instance(oop obj) {
 196     return obj != NULL && obj->klass() == SystemDictionary::String_klass();
 197   }
 198 
 199   // Debugging
 200   static void print(Handle java_string, outputStream* st);
 201   friend class JavaClasses;
 202 };
 203 
 204 
 205 // Interface to java.lang.Class objects
 206 
 207 #define CLASS_INJECTED_FIELDS(macro)                                       \
 208   macro(java_lang_Class, klass,                  intptr_signature,  false) \
 209   macro(java_lang_Class, array_klass,            intptr_signature,  false) \
 210   macro(java_lang_Class, oop_size,               int_signature,     false) \
 211   macro(java_lang_Class, static_oop_field_count, int_signature,     false)
 212 
 213 class java_lang_Class : AllStatic {
 214   friend class VMStructs;
 215 
 216  private:
 217   // The fake offsets are added by the class loader when java.lang.Class is loaded
 218 
 219   static int _klass_offset;
 220   static int _array_klass_offset;
 221 
 222   static int _oop_size_offset;
 223   static int _static_oop_field_count_offset;
 224 
 225   static bool offsets_computed;
 226   static int classRedefinedCount_offset;
 227   static GrowableArray<Klass*>* _fixup_mirror_list;
 228 
 229  public:
 230   static void compute_offsets();
 231 
 232   // Instance creation
 233   static oop  create_mirror(KlassHandle k, TRAPS);
 234   static void fixup_mirror(KlassHandle k, TRAPS);
 235   static oop  create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS);
 236   // Conversion
 237   static Klass* as_Klass(oop java_class);
 238   static void set_klass(oop java_class, Klass* klass);
 239   static BasicType as_BasicType(oop java_class, Klass** reference_klass = NULL);
 240   static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) {
 241     Klass* refk_oop = NULL;
 242     BasicType result = as_BasicType(java_class, &refk_oop);
 243     (*reference_klass) = KlassHandle(refk_oop);
 244     return result;
 245   }
 246   static Symbol* as_signature(oop java_class, bool intern_if_not_found, TRAPS);
 247   static void print_signature(oop java_class, outputStream *st);
 248   // Testing
 249   static bool is_instance(oop obj) {
 250     return obj != NULL && obj->klass() == SystemDictionary::Class_klass();
 251   }
 252   static bool is_primitive(oop java_class);
 253   static BasicType primitive_type(oop java_class);
 254   static oop primitive_mirror(BasicType t);
 255   // JVM_NewArray support
 256   static Klass* array_klass(oop java_class);
 257   static void set_array_klass(oop java_class, Klass* klass);
 258   // compiler support for class operations
 259   static int klass_offset_in_bytes()                { return _klass_offset; }
 260   static int array_klass_offset_in_bytes()          { return _array_klass_offset; }
 261   // Support for classRedefinedCount field
 262   static int classRedefinedCount(oop the_class_mirror);
 263   static void set_classRedefinedCount(oop the_class_mirror, int value);
 264 
 265   static int oop_size(oop java_class);
 266   static void set_oop_size(oop java_class, int size);
 267   static int static_oop_field_count(oop java_class);
 268   static void set_static_oop_field_count(oop java_class, int size);
 269 
 270   static GrowableArray<Klass*>* fixup_mirror_list() {
 271     return _fixup_mirror_list;
 272   }
 273   static void set_fixup_mirror_list(GrowableArray<Klass*>* v) {
 274     _fixup_mirror_list = v;
 275   }
 276   // Debugging
 277   friend class JavaClasses;
 278   friend class InstanceKlass;   // verification code accesses offsets
 279   friend class ClassFileParser; // access to number_of_fake_fields
 280 };
 281 
 282 // Interface to java.lang.Thread objects
 283 
 284 class java_lang_Thread : AllStatic {
 285  private:
 286   // Note that for this class the layout changed between JDK1.2 and JDK1.3,
 287   // so we compute the offsets at startup rather than hard-wiring them.
 288   static int _name_offset;
 289   static int _group_offset;
 290   static int _contextClassLoader_offset;
 291   static int _inheritedAccessControlContext_offset;
 292   static int _priority_offset;
 293   static int _eetop_offset;
 294   static int _daemon_offset;
 295   static int _stillborn_offset;
 296   static int _stackSize_offset;
 297   static int _tid_offset;
 298   static int _thread_status_offset;
 299   static int _park_blocker_offset;
 300   static int _park_event_offset ;
 301 
 302   static void compute_offsets();
 303 
 304  public:
 305   // Instance creation
 306   static oop create();
 307   // Returns the JavaThread associated with the thread obj
 308   static JavaThread* thread(oop java_thread);
 309   // Set JavaThread for instance
 310   static void set_thread(oop java_thread, JavaThread* thread);
 311   // Name
 312   static typeArrayOop name(oop java_thread);
 313   static void set_name(oop java_thread, typeArrayOop name);
 314   // Priority
 315   static ThreadPriority priority(oop java_thread);
 316   static void set_priority(oop java_thread, ThreadPriority priority);
 317   // Thread group
 318   static oop  threadGroup(oop java_thread);
 319   // Stillborn
 320   static bool is_stillborn(oop java_thread);
 321   static void set_stillborn(oop java_thread);
 322   // Alive (NOTE: this is not really a field, but provides the correct
 323   // definition without doing a Java call)
 324   static bool is_alive(oop java_thread);
 325   // Daemon
 326   static bool is_daemon(oop java_thread);
 327   static void set_daemon(oop java_thread);
 328   // Context ClassLoader
 329   static oop context_class_loader(oop java_thread);
 330   // Control context
 331   static oop inherited_access_control_context(oop java_thread);
 332   // Stack size hint
 333   static jlong stackSize(oop java_thread);
 334   // Thread ID
 335   static jlong thread_id(oop java_thread);
 336 
 337   // Blocker object responsible for thread parking
 338   static oop park_blocker(oop java_thread);
 339 
 340   // Pointer to type-stable park handler, encoded as jlong.
 341   // Should be set when apparently null
 342   // For details, see unsafe.cpp Unsafe_Unpark
 343   static jlong park_event(oop java_thread);
 344   static bool set_park_event(oop java_thread, jlong ptr);
 345 
 346   // Java Thread Status for JVMTI and M&M use.
 347   // This thread status info is saved in threadStatus field of
 348   // java.lang.Thread java class.
 349   enum ThreadStatus {
 350     NEW                      = 0,
 351     RUNNABLE                 = JVMTI_THREAD_STATE_ALIVE +          // runnable / running
 352                                JVMTI_THREAD_STATE_RUNNABLE,
 353     SLEEPING                 = JVMTI_THREAD_STATE_ALIVE +          // Thread.sleep()
 354                                JVMTI_THREAD_STATE_WAITING +
 355                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 356                                JVMTI_THREAD_STATE_SLEEPING,
 357     IN_OBJECT_WAIT           = JVMTI_THREAD_STATE_ALIVE +          // Object.wait()
 358                                JVMTI_THREAD_STATE_WAITING +
 359                                JVMTI_THREAD_STATE_WAITING_INDEFINITELY +
 360                                JVMTI_THREAD_STATE_IN_OBJECT_WAIT,
 361     IN_OBJECT_WAIT_TIMED     = JVMTI_THREAD_STATE_ALIVE +          // Object.wait(long)
 362                                JVMTI_THREAD_STATE_WAITING +
 363                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 364                                JVMTI_THREAD_STATE_IN_OBJECT_WAIT,
 365     PARKED                   = JVMTI_THREAD_STATE_ALIVE +          // LockSupport.park()
 366                                JVMTI_THREAD_STATE_WAITING +
 367                                JVMTI_THREAD_STATE_WAITING_INDEFINITELY +
 368                                JVMTI_THREAD_STATE_PARKED,
 369     PARKED_TIMED             = JVMTI_THREAD_STATE_ALIVE +          // LockSupport.park(long)
 370                                JVMTI_THREAD_STATE_WAITING +
 371                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 372                                JVMTI_THREAD_STATE_PARKED,
 373     BLOCKED_ON_MONITOR_ENTER = JVMTI_THREAD_STATE_ALIVE +          // (re-)entering a synchronization block
 374                                JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER,
 375     TERMINATED               = JVMTI_THREAD_STATE_TERMINATED
 376   };
 377   // Write thread status info to threadStatus field of java.lang.Thread.
 378   static void set_thread_status(oop java_thread_oop, ThreadStatus status);
 379   // Read thread status info from threadStatus field of java.lang.Thread.
 380   static ThreadStatus get_thread_status(oop java_thread_oop);
 381 
 382   static const char*  thread_status_name(oop java_thread_oop);
 383 
 384   // Debugging
 385   friend class JavaClasses;
 386 };
 387 
 388 // Interface to java.lang.ThreadGroup objects
 389 
 390 class java_lang_ThreadGroup : AllStatic {
 391  private:
 392   static int _parent_offset;
 393   static int _name_offset;
 394   static int _threads_offset;
 395   static int _groups_offset;
 396   static int _maxPriority_offset;
 397   static int _destroyed_offset;
 398   static int _daemon_offset;
 399   static int _vmAllowSuspension_offset;
 400   static int _nthreads_offset;
 401   static int _ngroups_offset;
 402 
 403   static void compute_offsets();
 404 
 405  public:
 406   // parent ThreadGroup
 407   static oop  parent(oop java_thread_group);
 408   // name
 409   static typeArrayOop name(oop java_thread_group);
 410   // ("name as oop" accessor is not necessary)
 411   // Number of threads in group
 412   static int nthreads(oop java_thread_group);
 413   // threads
 414   static objArrayOop threads(oop java_thread_group);
 415   // Number of threads in group
 416   static int ngroups(oop java_thread_group);
 417   // groups
 418   static objArrayOop groups(oop java_thread_group);
 419   // maxPriority in group
 420   static ThreadPriority maxPriority(oop java_thread_group);
 421   // Destroyed
 422   static bool is_destroyed(oop java_thread_group);
 423   // Daemon
 424   static bool is_daemon(oop java_thread_group);
 425   // vmAllowSuspension
 426   static bool is_vmAllowSuspension(oop java_thread_group);
 427   // Debugging
 428   friend class JavaClasses;
 429 };
 430 
 431 
 432 
 433 // Interface to java.lang.Throwable objects
 434 
 435 class java_lang_Throwable: AllStatic {
 436   friend class BacktraceBuilder;
 437 
 438  private:
 439   // Offsets
 440   enum {
 441     hc_backtrace_offset     =  0,
 442     hc_detailMessage_offset =  1,
 443     hc_cause_offset         =  2,  // New since 1.4
 444     hc_stackTrace_offset    =  3   // New since 1.4
 445   };
 446   enum {
 447       hc_static_unassigned_stacktrace_offset = 0  // New since 1.7
 448   };
 449   // Trace constants
 450   enum {
 451     trace_methods_offset = 0,
 452     trace_bcis_offset    = 1,
 453     trace_mirrors_offset = 2,
 454     trace_next_offset    = 3,
 455     trace_size           = 4,
 456     trace_chunk_size     = 32
 457   };
 458 
 459   static int backtrace_offset;
 460   static int detailMessage_offset;
 461   static int cause_offset;
 462   static int stackTrace_offset;
 463   static int static_unassigned_stacktrace_offset;
 464 
 465   // Printing
 466   static char* print_stack_element_to_buffer(Handle mirror, int method, int version, int bci);
 467   // StackTrace (programmatic access, new since 1.4)
 468   static void clear_stacktrace(oop throwable);
 469   // No stack trace available
 470   static const char* no_stack_trace_message();
 471   // Stacktrace (post JDK 1.7.0 to allow immutability protocol to be followed)
 472   static void set_stacktrace(oop throwable, oop st_element_array);
 473   static oop unassigned_stacktrace();
 474 
 475  public:
 476   // Backtrace
 477   static oop backtrace(oop throwable);
 478   static void set_backtrace(oop throwable, oop value);
 479   // Needed by JVMTI to filter out this internal field.
 480   static int get_backtrace_offset() { return backtrace_offset;}
 481   static int get_detailMessage_offset() { return detailMessage_offset;}
 482   // Message
 483   static oop message(oop throwable);
 484   static oop message(Handle throwable);
 485   static void set_message(oop throwable, oop value);
 486   static void print_stack_element(outputStream *st, Handle mirror, int method,
 487                                   int version, int bci);
 488   static void print_stack_element(outputStream *st, methodHandle method, int bci);
 489   static void print_stack_usage(Handle stream);
 490 
 491   // Allocate space for backtrace (created but stack trace not filled in)
 492   static void allocate_backtrace(Handle throwable, TRAPS);
 493   // Fill in current stack trace for throwable with preallocated backtrace (no GC)
 494   static void fill_in_stack_trace_of_preallocated_backtrace(Handle throwable);
 495   // Fill in current stack trace, can cause GC
 496   static void fill_in_stack_trace(Handle throwable, methodHandle method, TRAPS);
 497   static void fill_in_stack_trace(Handle throwable, methodHandle method = methodHandle());
 498   // Programmatic access to stack trace
 499   static oop  get_stack_trace_element(oop throwable, int index, TRAPS);
 500   static int  get_stack_trace_depth(oop throwable, TRAPS);
 501   // Printing
 502   static void print(oop throwable, outputStream* st);
 503   static void print(Handle throwable, outputStream* st);
 504   static void print_stack_trace(oop throwable, outputStream* st);
 505   // Debugging
 506   friend class JavaClasses;
 507 };
 508 
 509 
 510 // Interface to java.lang.reflect.AccessibleObject objects
 511 
 512 class java_lang_reflect_AccessibleObject: AllStatic {
 513  private:
 514   // Note that to reduce dependencies on the JDK we compute these
 515   // offsets at run-time.
 516   static int override_offset;
 517 
 518   static void compute_offsets();
 519 
 520  public:
 521   // Accessors
 522   static jboolean override(oop reflect);
 523   static void set_override(oop reflect, jboolean value);
 524 
 525   // Debugging
 526   friend class JavaClasses;
 527 };
 528 
 529 
 530 // Interface to java.lang.reflect.Method objects
 531 
 532 class java_lang_reflect_Method : public java_lang_reflect_AccessibleObject {
 533  private:
 534   // Note that to reduce dependencies on the JDK we compute these
 535   // offsets at run-time.
 536   static int clazz_offset;
 537   static int name_offset;
 538   static int returnType_offset;
 539   static int parameterTypes_offset;
 540   static int exceptionTypes_offset;
 541   static int slot_offset;
 542   static int modifiers_offset;
 543   static int signature_offset;
 544   static int annotations_offset;
 545   static int parameter_annotations_offset;
 546   static int annotation_default_offset;
 547   static int type_annotations_offset;
 548 
 549   static void compute_offsets();
 550 
 551  public:
 552   // Allocation
 553   static Handle create(TRAPS);
 554 
 555   // Accessors
 556   static oop clazz(oop reflect);
 557   static void set_clazz(oop reflect, oop value);
 558 
 559   static oop name(oop method);
 560   static void set_name(oop method, oop value);
 561 
 562   static oop return_type(oop method);
 563   static void set_return_type(oop method, oop value);
 564 
 565   static oop parameter_types(oop method);
 566   static void set_parameter_types(oop method, oop value);
 567 
 568   static oop exception_types(oop method);
 569   static void set_exception_types(oop method, oop value);
 570 
 571   static int slot(oop reflect);
 572   static void set_slot(oop reflect, int value);
 573 
 574   static int modifiers(oop method);
 575   static void set_modifiers(oop method, int value);
 576 
 577   static bool has_signature_field();
 578   static oop signature(oop method);
 579   static void set_signature(oop method, oop value);
 580 
 581   static bool has_annotations_field();
 582   static oop annotations(oop method);
 583   static void set_annotations(oop method, oop value);
 584 
 585   static bool has_parameter_annotations_field();
 586   static oop parameter_annotations(oop method);
 587   static void set_parameter_annotations(oop method, oop value);
 588 
 589   static bool has_annotation_default_field();
 590   static oop annotation_default(oop method);
 591   static void set_annotation_default(oop method, oop value);
 592 
 593   static bool has_type_annotations_field();
 594   static oop type_annotations(oop method);
 595   static void set_type_annotations(oop method, oop value);
 596 
 597   // Debugging
 598   friend class JavaClasses;
 599 };
 600 
 601 
 602 // Interface to java.lang.reflect.Constructor objects
 603 
 604 class java_lang_reflect_Constructor : public java_lang_reflect_AccessibleObject {
 605  private:
 606   // Note that to reduce dependencies on the JDK we compute these
 607   // offsets at run-time.
 608   static int clazz_offset;
 609   static int parameterTypes_offset;
 610   static int exceptionTypes_offset;
 611   static int slot_offset;
 612   static int modifiers_offset;
 613   static int signature_offset;
 614   static int annotations_offset;
 615   static int parameter_annotations_offset;
 616   static int type_annotations_offset;
 617 
 618   static void compute_offsets();
 619 
 620  public:
 621   // Allocation
 622   static Handle create(TRAPS);
 623 
 624   // Accessors
 625   static oop clazz(oop reflect);
 626   static void set_clazz(oop reflect, oop value);
 627 
 628   static oop parameter_types(oop constructor);
 629   static void set_parameter_types(oop constructor, oop value);
 630 
 631   static oop exception_types(oop constructor);
 632   static void set_exception_types(oop constructor, oop value);
 633 
 634   static int slot(oop reflect);
 635   static void set_slot(oop reflect, int value);
 636 
 637   static int modifiers(oop constructor);
 638   static void set_modifiers(oop constructor, int value);
 639 
 640   static bool has_signature_field();
 641   static oop signature(oop constructor);
 642   static void set_signature(oop constructor, oop value);
 643 
 644   static bool has_annotations_field();
 645   static oop annotations(oop constructor);
 646   static void set_annotations(oop constructor, oop value);
 647 
 648   static bool has_parameter_annotations_field();
 649   static oop parameter_annotations(oop method);
 650   static void set_parameter_annotations(oop method, oop value);
 651 
 652   static bool has_type_annotations_field();
 653   static oop type_annotations(oop constructor);
 654   static void set_type_annotations(oop constructor, oop value);
 655 
 656   // Debugging
 657   friend class JavaClasses;
 658 };
 659 
 660 
 661 // Interface to java.lang.reflect.Field objects
 662 
 663 class java_lang_reflect_Field : public java_lang_reflect_AccessibleObject {
 664  private:
 665   // Note that to reduce dependencies on the JDK we compute these
 666   // offsets at run-time.
 667   static int clazz_offset;
 668   static int name_offset;
 669   static int type_offset;
 670   static int slot_offset;
 671   static int modifiers_offset;
 672   static int signature_offset;
 673   static int annotations_offset;
 674   static int type_annotations_offset;
 675 
 676   static void compute_offsets();
 677 
 678  public:
 679   // Allocation
 680   static Handle create(TRAPS);
 681 
 682   // Accessors
 683   static oop clazz(oop reflect);
 684   static void set_clazz(oop reflect, oop value);
 685 
 686   static oop name(oop field);
 687   static void set_name(oop field, oop value);
 688 
 689   static oop type(oop field);
 690   static void set_type(oop field, oop value);
 691 
 692   static int slot(oop reflect);
 693   static void set_slot(oop reflect, int value);
 694 
 695   static int modifiers(oop field);
 696   static void set_modifiers(oop field, int value);
 697 
 698   static bool has_signature_field();
 699   static oop signature(oop constructor);
 700   static void set_signature(oop constructor, oop value);
 701 
 702   static bool has_annotations_field();
 703   static oop annotations(oop constructor);
 704   static void set_annotations(oop constructor, oop value);
 705 
 706   static bool has_parameter_annotations_field();
 707   static oop parameter_annotations(oop method);
 708   static void set_parameter_annotations(oop method, oop value);
 709 
 710   static bool has_annotation_default_field();
 711   static oop annotation_default(oop method);
 712   static void set_annotation_default(oop method, oop value);
 713 
 714   static bool has_type_annotations_field();
 715   static oop type_annotations(oop field);
 716   static void set_type_annotations(oop field, oop value);
 717 
 718   // Debugging
 719   friend class JavaClasses;
 720 };
 721 
 722 class java_lang_reflect_Parameter {
 723  private:
 724   // Note that to reduce dependencies on the JDK we compute these
 725   // offsets at run-time.
 726   static int name_offset;
 727   static int modifiers_offset;
 728   static int index_offset;
 729   static int executable_offset;
 730 
 731   static void compute_offsets();
 732 
 733  public:
 734   // Allocation
 735   static Handle create(TRAPS);
 736 
 737   // Accessors
 738   static oop name(oop field);
 739   static void set_name(oop field, oop value);
 740 
 741   static int index(oop reflect);
 742   static void set_index(oop reflect, int value);
 743 
 744   static int modifiers(oop reflect);
 745   static void set_modifiers(oop reflect, int value);
 746 
 747   static oop executable(oop constructor);
 748   static void set_executable(oop constructor, oop value);
 749 
 750   friend class JavaClasses;
 751 };
 752 
 753 // Interface to sun.reflect.ConstantPool objects
 754 class sun_reflect_ConstantPool {
 755  private:
 756   // Note that to reduce dependencies on the JDK we compute these
 757   // offsets at run-time.
 758   static int _oop_offset;
 759 
 760   static void compute_offsets();
 761 
 762  public:
 763   // Allocation
 764   static Handle create(TRAPS);
 765 
 766   // Accessors
 767   static void set_cp(oop reflect, ConstantPool* value);
 768   static int oop_offset() {
 769     return _oop_offset;
 770   }
 771 
 772   static ConstantPool* get_cp(oop reflect);
 773 
 774   // Debugging
 775   friend class JavaClasses;
 776 };
 777 
 778 // Interface to sun.reflect.UnsafeStaticFieldAccessorImpl objects
 779 class sun_reflect_UnsafeStaticFieldAccessorImpl {
 780  private:
 781   static int _base_offset;
 782   static void compute_offsets();
 783 
 784  public:
 785   static int base_offset() {
 786     return _base_offset;
 787   }
 788 
 789   // Debugging
 790   friend class JavaClasses;
 791 };
 792 
 793 // Interface to java.lang primitive type boxing objects:
 794 //  - java.lang.Boolean
 795 //  - java.lang.Character
 796 //  - java.lang.Float
 797 //  - java.lang.Double
 798 //  - java.lang.Byte
 799 //  - java.lang.Short
 800 //  - java.lang.Integer
 801 //  - java.lang.Long
 802 
 803 // This could be separated out into 8 individual classes.
 804 
 805 class java_lang_boxing_object: AllStatic {
 806  private:
 807   enum {
 808    hc_value_offset = 0
 809   };
 810   static int value_offset;
 811   static int long_value_offset;
 812 
 813   static oop initialize_and_allocate(BasicType type, TRAPS);
 814  public:
 815   // Allocation. Returns a boxed value, or NULL for invalid type.
 816   static oop create(BasicType type, jvalue* value, TRAPS);
 817   // Accessors. Returns the basic type being boxed, or T_ILLEGAL for invalid oop.
 818   static BasicType get_value(oop box, jvalue* value);
 819   static BasicType set_value(oop box, jvalue* value);
 820   static BasicType basic_type(oop box);
 821   static bool is_instance(oop box)                 { return basic_type(box) != T_ILLEGAL; }
 822   static bool is_instance(oop box, BasicType type) { return basic_type(box) == type; }
 823   static void print(oop box, outputStream* st)     { jvalue value;  print(get_value(box, &value), &value, st); }
 824   static void print(BasicType type, jvalue* value, outputStream* st);
 825 
 826   static int value_offset_in_bytes(BasicType type) {
 827     return ( type == T_LONG || type == T_DOUBLE ) ? long_value_offset :
 828                                                     value_offset;
 829   }
 830 
 831   // Debugging
 832   friend class JavaClasses;
 833 };
 834 
 835 
 836 
 837 // Interface to java.lang.ref.Reference objects
 838 
 839 class java_lang_ref_Reference: AllStatic {
 840  public:
 841   enum {
 842    hc_referent_offset   = 0,
 843    hc_queue_offset      = 1,
 844    hc_next_offset       = 2,
 845    hc_discovered_offset = 3  // Is not last, see SoftRefs.
 846   };
 847   enum {
 848    hc_static_lock_offset    = 0,
 849    hc_static_pending_offset = 1
 850   };
 851 
 852   static int referent_offset;
 853   static int queue_offset;
 854   static int next_offset;
 855   static int discovered_offset;
 856   static int static_lock_offset;
 857   static int static_pending_offset;
 858   static int number_of_fake_oop_fields;
 859 
 860   // Accessors
 861   static oop referent(oop ref) {
 862     return ref->obj_field(referent_offset);
 863   }
 864   static void set_referent(oop ref, oop value) {
 865     ref->obj_field_put(referent_offset, value);
 866   }
 867   static void set_referent_raw(oop ref, oop value) {
 868     ref->obj_field_put_raw(referent_offset, value);
 869   }
 870   static HeapWord* referent_addr(oop ref) {
 871     return ref->obj_field_addr<HeapWord>(referent_offset);
 872   }
 873   static oop next(oop ref) {
 874     return ref->obj_field(next_offset);
 875   }
 876   static void set_next(oop ref, oop value) {
 877     ref->obj_field_put(next_offset, value);
 878   }
 879   static void set_next_raw(oop ref, oop value) {
 880     ref->obj_field_put_raw(next_offset, value);
 881   }
 882   static HeapWord* next_addr(oop ref) {
 883     return ref->obj_field_addr<HeapWord>(next_offset);
 884   }
 885   static oop discovered(oop ref) {
 886     return ref->obj_field(discovered_offset);
 887   }
 888   static void set_discovered(oop ref, oop value) {
 889     ref->obj_field_put(discovered_offset, value);
 890   }
 891   static void set_discovered_raw(oop ref, oop value) {
 892     ref->obj_field_put_raw(discovered_offset, value);
 893   }
 894   static HeapWord* discovered_addr(oop ref) {
 895     return ref->obj_field_addr<HeapWord>(discovered_offset);
 896   }
 897   // Accessors for statics
 898   static oop  pending_list_lock();
 899   static oop  pending_list();
 900 
 901   static HeapWord*  pending_list_lock_addr();
 902   static HeapWord*  pending_list_addr();
 903 };
 904 
 905 
 906 // Interface to java.lang.ref.SoftReference objects
 907 
 908 class java_lang_ref_SoftReference: public java_lang_ref_Reference {
 909  public:
 910   enum {
 911    // The timestamp is a long field and may need to be adjusted for alignment.
 912    hc_timestamp_offset  = hc_discovered_offset + 1
 913   };
 914   enum {
 915    hc_static_clock_offset = 0
 916   };
 917 
 918   static int timestamp_offset;
 919   static int static_clock_offset;
 920 
 921   // Accessors
 922   static jlong timestamp(oop ref);
 923 
 924   // Accessors for statics
 925   static jlong clock();
 926   static void set_clock(jlong value);
 927 };
 928 
 929 
 930 // Interface to java.lang.invoke.MethodHandle objects
 931 
 932 class MethodHandleEntry;
 933 
 934 class java_lang_invoke_MethodHandle: AllStatic {
 935   friend class JavaClasses;
 936 
 937  private:
 938   static int _type_offset;               // the MethodType of this MH
 939   static int _form_offset;               // the LambdaForm of this MH
 940 
 941   static void compute_offsets();
 942 
 943  public:
 944   // Accessors
 945   static oop            type(oop mh);
 946   static void       set_type(oop mh, oop mtype);
 947 
 948   static oop            form(oop mh);
 949   static void       set_form(oop mh, oop lform);
 950 
 951   // Testers
 952   static bool is_subclass(Klass* klass) {
 953     return klass->is_subclass_of(SystemDictionary::MethodHandle_klass());
 954   }
 955   static bool is_instance(oop obj) {
 956     return obj != NULL && is_subclass(obj->klass());
 957   }
 958 
 959   // Accessors for code generation:
 960   static int type_offset_in_bytes()             { return _type_offset; }
 961   static int form_offset_in_bytes()             { return _form_offset; }
 962 };
 963 
 964 // Interface to java.lang.invoke.LambdaForm objects
 965 // (These are a private interface for managing adapter code generation.)
 966 
 967 class java_lang_invoke_LambdaForm: AllStatic {
 968   friend class JavaClasses;
 969 
 970  private:
 971   static int _vmentry_offset;  // type is MemberName
 972 
 973   static void compute_offsets();
 974 
 975  public:
 976   // Accessors
 977   static oop            vmentry(oop lform);
 978   static void       set_vmentry(oop lform, oop invoker);
 979 
 980   // Testers
 981   static bool is_subclass(Klass* klass) {
 982     return SystemDictionary::LambdaForm_klass() != NULL &&
 983       klass->is_subclass_of(SystemDictionary::LambdaForm_klass());
 984   }
 985   static bool is_instance(oop obj) {
 986     return obj != NULL && is_subclass(obj->klass());
 987   }
 988 
 989   // Accessors for code generation:
 990   static int vmentry_offset_in_bytes()          { return _vmentry_offset; }
 991 };
 992 
 993 
 994 // Interface to java.lang.invoke.MemberName objects
 995 // (These are a private interface for Java code to query the class hierarchy.)
 996 
 997 #define MEMBERNAME_INJECTED_FIELDS(macro)                               \
 998   macro(java_lang_invoke_MemberName, vmloader, object_signature, false) \
 999   macro(java_lang_invoke_MemberName, vmindex,  intptr_signature, false) \
1000   macro(java_lang_invoke_MemberName, vmtarget, intptr_signature, false)
1001 
1002 class java_lang_invoke_MemberName: AllStatic {
1003   friend class JavaClasses;
1004 
1005  private:
1006   // From java.lang.invoke.MemberName:
1007   //    private Class<?>   clazz;       // class in which the method is defined
1008   //    private String     name;        // may be null if not yet materialized
1009   //    private Object     type;        // may be null if not yet materialized
1010   //    private int        flags;       // modifier bits; see reflect.Modifier
1011   //    private intptr     vmtarget;    // VM-specific target value
1012   //    private intptr_t   vmindex;     // member index within class or interface
1013   static int _clazz_offset;
1014   static int _name_offset;
1015   static int _type_offset;
1016   static int _flags_offset;
1017   static int _vmtarget_offset;
1018   static int _vmloader_offset;
1019   static int _vmindex_offset;
1020 
1021   static void compute_offsets();
1022 
1023  public:
1024   // Accessors
1025   static oop            clazz(oop mname);
1026   static void       set_clazz(oop mname, oop clazz);
1027 
1028   static oop            type(oop mname);
1029   static void       set_type(oop mname, oop type);
1030 
1031   static oop            name(oop mname);
1032   static void       set_name(oop mname, oop name);
1033 
1034   static int            flags(oop mname);
1035   static void       set_flags(oop mname, int flags);
1036 
1037   static Metadata*      vmtarget(oop mname);
1038   static void       set_vmtarget(oop mname, Metadata* target);
1039 
1040   static intptr_t       vmindex(oop mname);
1041   static void       set_vmindex(oop mname, intptr_t index);
1042 
1043   // Testers
1044   static bool is_subclass(Klass* klass) {
1045     return klass->is_subclass_of(SystemDictionary::MemberName_klass());
1046   }
1047   static bool is_instance(oop obj) {
1048     return obj != NULL && is_subclass(obj->klass());
1049   }
1050 
1051   // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants):
1052   enum {
1053     MN_IS_METHOD            = 0x00010000, // method (not constructor)
1054     MN_IS_CONSTRUCTOR       = 0x00020000, // constructor
1055     MN_IS_FIELD             = 0x00040000, // field
1056     MN_IS_TYPE              = 0x00080000, // nested type
1057     MN_CALLER_SENSITIVE     = 0x00100000, // @CallerSensitive annotation detected
1058     MN_REFERENCE_KIND_SHIFT = 24, // refKind
1059     MN_REFERENCE_KIND_MASK  = 0x0F000000 >> MN_REFERENCE_KIND_SHIFT,
1060     // The SEARCH_* bits are not for MN.flags but for the matchFlags argument of MHN.getMembers:
1061     MN_SEARCH_SUPERCLASSES  = 0x00100000, // walk super classes
1062     MN_SEARCH_INTERFACES    = 0x00200000  // walk implemented interfaces
1063   };
1064 
1065   // Accessors for code generation:
1066   static int clazz_offset_in_bytes()            { return _clazz_offset; }
1067   static int type_offset_in_bytes()             { return _type_offset; }
1068   static int name_offset_in_bytes()             { return _name_offset; }
1069   static int flags_offset_in_bytes()            { return _flags_offset; }
1070   static int vmtarget_offset_in_bytes()         { return _vmtarget_offset; }
1071   static int vmindex_offset_in_bytes()          { return _vmindex_offset; }
1072 };
1073 
1074 
1075 // Interface to java.lang.invoke.MethodType objects
1076 
1077 class java_lang_invoke_MethodType: AllStatic {
1078   friend class JavaClasses;
1079 
1080  private:
1081   static int _rtype_offset;
1082   static int _ptypes_offset;
1083 
1084   static void compute_offsets();
1085 
1086  public:
1087   // Accessors
1088   static oop            rtype(oop mt);
1089   static objArrayOop    ptypes(oop mt);
1090 
1091   static oop            ptype(oop mt, int index);
1092   static int            ptype_count(oop mt);
1093 
1094   static int            ptype_slot_count(oop mt);  // extra counts for long/double
1095   static int            rtype_slot_count(oop mt);  // extra counts for long/double
1096 
1097   static Symbol*        as_signature(oop mt, bool intern_if_not_found, TRAPS);
1098   static void           print_signature(oop mt, outputStream* st);
1099 
1100   static bool is_instance(oop obj) {
1101     return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass();
1102   }
1103 
1104   static bool equals(oop mt1, oop mt2);
1105 
1106   // Accessors for code generation:
1107   static int rtype_offset_in_bytes()            { return _rtype_offset; }
1108   static int ptypes_offset_in_bytes()           { return _ptypes_offset; }
1109 };
1110 
1111 
1112 // Interface to java.lang.invoke.CallSite objects
1113 
1114 class java_lang_invoke_CallSite: AllStatic {
1115   friend class JavaClasses;
1116 
1117 private:
1118   static int _target_offset;
1119 
1120   static void compute_offsets();
1121 
1122 public:
1123   // Accessors
1124   static oop              target(         oop site)             { return site->obj_field(             _target_offset);         }
1125   static void         set_target(         oop site, oop target) {        site->obj_field_put(         _target_offset, target); }
1126 
1127   static volatile oop     target_volatile(oop site)             { return site->obj_field_volatile(    _target_offset);         }
1128   static void         set_target_volatile(oop site, oop target) {        site->obj_field_put_volatile(_target_offset, target); }
1129 
1130   // Testers
1131   static bool is_subclass(Klass* klass) {
1132     return klass->is_subclass_of(SystemDictionary::CallSite_klass());
1133   }
1134   static bool is_instance(oop obj) {
1135     return obj != NULL && is_subclass(obj->klass());
1136   }
1137 
1138   // Accessors for code generation:
1139   static int target_offset_in_bytes()           { return _target_offset; }
1140 };
1141 
1142 
1143 // Interface to java.security.AccessControlContext objects
1144 
1145 class java_security_AccessControlContext: AllStatic {
1146  private:
1147   // Note that for this class the layout changed between JDK1.2 and JDK1.3,
1148   // so we compute the offsets at startup rather than hard-wiring them.
1149   static int _context_offset;
1150   static int _privilegedContext_offset;
1151   static int _isPrivileged_offset;
1152 
1153   static void compute_offsets();
1154  public:
1155   static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS);
1156 
1157   // Debugging/initialization
1158   friend class JavaClasses;
1159 };
1160 
1161 
1162 // Interface to java.lang.ClassLoader objects
1163 
1164 #define CLASSLOADER_INJECTED_FIELDS(macro)                            \
1165   macro(java_lang_ClassLoader, loader_data,  intptr_signature, false)
1166 
1167 class java_lang_ClassLoader : AllStatic {
1168  private:
1169   // The fake offsets are added by the class loader when java.lang.Class is loaded
1170   enum {
1171    hc_parent_offset = 0
1172   };
1173   static int _loader_data_offset;
1174   static bool offsets_computed;
1175   static int parent_offset;
1176   static int parallelCapable_offset;
1177 
1178  public:
1179   static void compute_offsets();
1180 
1181   static ClassLoaderData** loader_data_addr(oop loader);
1182   static ClassLoaderData* loader_data(oop loader);
1183 
1184   static oop parent(oop loader);
1185   static bool isAncestor(oop loader, oop cl);
1186 
1187   // Support for parallelCapable field
1188   static bool parallelCapable(oop the_class_mirror);
1189 
1190   static bool is_trusted_loader(oop loader);
1191 
1192   // Fix for 4474172
1193   static oop  non_reflection_class_loader(oop loader);
1194 
1195   // Testers
1196   static bool is_subclass(Klass* klass) {
1197     return klass->is_subclass_of(SystemDictionary::ClassLoader_klass());
1198   }
1199   static bool is_instance(oop obj) {
1200     return obj != NULL && is_subclass(obj->klass());
1201   }
1202 
1203   // Debugging
1204   friend class JavaClasses;
1205   friend class ClassFileParser; // access to number_of_fake_fields
1206 };
1207 
1208 
1209 // Interface to java.lang.System objects
1210 
1211 class java_lang_System : AllStatic {
1212  private:
1213   enum {
1214    hc_static_in_offset  = 0,
1215    hc_static_out_offset = 1,
1216    hc_static_err_offset = 2
1217   };
1218 
1219   static int  static_in_offset;
1220   static int static_out_offset;
1221   static int static_err_offset;
1222 
1223  public:
1224   static int  in_offset_in_bytes();
1225   static int out_offset_in_bytes();
1226   static int err_offset_in_bytes();
1227 
1228   // Debugging
1229   friend class JavaClasses;
1230 };
1231 
1232 
1233 // Interface to java.lang.StackTraceElement objects
1234 
1235 class java_lang_StackTraceElement: AllStatic {
1236  private:
1237   enum {
1238     hc_declaringClass_offset  = 0,
1239     hc_methodName_offset = 1,
1240     hc_fileName_offset   = 2,
1241     hc_lineNumber_offset = 3
1242   };
1243 
1244   static int declaringClass_offset;
1245   static int methodName_offset;
1246   static int fileName_offset;
1247   static int lineNumber_offset;
1248 
1249  public:
1250   // Setters
1251   static void set_declaringClass(oop element, oop value);
1252   static void set_methodName(oop element, oop value);
1253   static void set_fileName(oop element, oop value);
1254   static void set_lineNumber(oop element, int value);
1255 
1256   // Create an instance of StackTraceElement
1257   static oop create(Handle mirror, int method, int version, int bci, TRAPS);
1258   static oop create(methodHandle method, int bci, TRAPS);
1259 
1260   // Debugging
1261   friend class JavaClasses;
1262 };
1263 
1264 
1265 // Interface to java.lang.AssertionStatusDirectives objects
1266 
1267 class java_lang_AssertionStatusDirectives: AllStatic {
1268  private:
1269   enum {
1270     hc_classes_offset,
1271     hc_classEnabled_offset,
1272     hc_packages_offset,
1273     hc_packageEnabled_offset,
1274     hc_deflt_offset
1275   };
1276 
1277   static int classes_offset;
1278   static int classEnabled_offset;
1279   static int packages_offset;
1280   static int packageEnabled_offset;
1281   static int deflt_offset;
1282 
1283  public:
1284   // Setters
1285   static void set_classes(oop obj, oop val);
1286   static void set_classEnabled(oop obj, oop val);
1287   static void set_packages(oop obj, oop val);
1288   static void set_packageEnabled(oop obj, oop val);
1289   static void set_deflt(oop obj, bool val);
1290   // Debugging
1291   friend class JavaClasses;
1292 };
1293 
1294 
1295 class java_nio_Buffer: AllStatic {
1296  private:
1297   static int _limit_offset;
1298 
1299  public:
1300   static int  limit_offset();
1301   static void compute_offsets();
1302 };
1303 
1304 class java_util_concurrent_locks_AbstractOwnableSynchronizer : AllStatic {
1305  private:
1306   static int  _owner_offset;
1307  public:
1308   static void initialize(TRAPS);
1309   static oop  get_owner_threadObj(oop obj);
1310 };
1311 
1312 // Use to declare fields that need to be injected into Java classes
1313 // for the JVM to use.  The name_index and signature_index are
1314 // declared in vmSymbols.  The may_be_java flag is used to declare
1315 // fields that might already exist in Java but should be injected if
1316 // they don't.  Otherwise the field is unconditionally injected and
1317 // the JVM uses the injected one.  This is to ensure that name
1318 // collisions don't occur.  In general may_be_java should be false
1319 // unless there's a good reason.
1320 
1321 class InjectedField {
1322  public:
1323   const SystemDictionary::WKID klass_id;
1324   const vmSymbols::SID name_index;
1325   const vmSymbols::SID signature_index;
1326   const bool           may_be_java;
1327 
1328 
1329   Klass* klass() const    { return SystemDictionary::well_known_klass(klass_id); }
1330   Symbol* name() const      { return lookup_symbol(name_index); }
1331   Symbol* signature() const { return lookup_symbol(signature_index); }
1332 
1333   int compute_offset();
1334 
1335   // Find the Symbol for this index
1336   static Symbol* lookup_symbol(int symbol_index) {
1337     return vmSymbols::symbol_at((vmSymbols::SID)symbol_index);
1338   }
1339 };
1340 
1341 #define DECLARE_INJECTED_FIELD_ENUM(klass, name, signature, may_be_java) \
1342   klass##_##name##_enum,
1343 
1344 #define ALL_INJECTED_FIELDS(macro)          \
1345   CLASS_INJECTED_FIELDS(macro)              \
1346   CLASSLOADER_INJECTED_FIELDS(macro)        \
1347   MEMBERNAME_INJECTED_FIELDS(macro)
1348 
1349 // Interface to hard-coded offset checking
1350 
1351 class JavaClasses : AllStatic {
1352  private:
1353 
1354   static InjectedField _injected_fields[];
1355 
1356   static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1357   static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1358   static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1359 
1360  public:
1361   enum InjectedFieldID {
1362     ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM)
1363     MAX_enum
1364   };
1365 
1366   static int compute_injected_offset(InjectedFieldID id);
1367 
1368   static void compute_hard_coded_offsets();
1369   static void compute_offsets();
1370   static void check_offsets() PRODUCT_RETURN;
1371 
1372   static InjectedField* get_injected(Symbol* class_name, int* field_count);
1373 };
1374 
1375 #undef DECLARE_INJECTED_FIELD_ENUM
1376 
1377 #endif // SHARE_VM_CLASSFILE_JAVACLASSES_HPP