1 /*
   2  * Copyright (c) 1997, 2011, 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   enum {
  56     hc_value_offset  = 0,
  57     hc_offset_offset = 1
  58     //hc_count_offset = 2  -- not a word-scaled offset
  59     //hc_hash_offset  = 3  -- not a word-scaled offset
  60   };
  61 
  62   static int value_offset;
  63   static int offset_offset;
  64   static int count_offset;
  65   static int hash_offset;
  66 
  67   static Handle basic_create(int length, bool tenured, TRAPS);
  68   static Handle basic_create_from_unicode(jchar* unicode, int length, bool tenured, TRAPS);
  69 
  70   static void set_value( oop string, typeArrayOop buffer) { string->obj_field_put(value_offset,  (oop)buffer); }
  71   static void set_offset(oop string, int offset)          { string->int_field_put(offset_offset, offset); }
  72   static void set_count( oop string, int count)           { string->int_field_put(count_offset,  count);  }
  73 
  74  public:
  75   // Instance creation
  76   static Handle create_from_unicode(jchar* unicode, int len, TRAPS);
  77   static Handle create_tenured_from_unicode(jchar* unicode, int len, TRAPS);
  78   static oop    create_oop_from_unicode(jchar* unicode, int len, TRAPS);
  79   static Handle create_from_str(const char* utf8_str, TRAPS);
  80   static oop    create_oop_from_str(const char* utf8_str, TRAPS);
  81   static Handle create_from_symbol(Symbol* symbol, TRAPS);
  82   static Handle create_from_platform_dependent_str(const char* str, TRAPS);
  83   static Handle char_converter(Handle java_string, jchar from_char, jchar to_char, TRAPS);
  84 
  85   static int value_offset_in_bytes()  { return value_offset;  }
  86   static int count_offset_in_bytes()  { return count_offset;  }
  87   static int offset_offset_in_bytes() { return offset_offset; }
  88   static int hash_offset_in_bytes()   { return hash_offset;   }
  89 
  90   // Accessors
  91   static typeArrayOop value(oop java_string) {
  92     assert(is_instance(java_string), "must be java_string");
  93     return (typeArrayOop) java_string->obj_field(value_offset);
  94   }
  95   static int offset(oop java_string) {
  96     assert(is_instance(java_string), "must be java_string");
  97     return java_string->int_field(offset_offset);
  98   }
  99   static int length(oop java_string) {
 100     assert(is_instance(java_string), "must be java_string");
 101     return java_string->int_field(count_offset);
 102   }
 103   static int utf8_length(oop java_string);
 104 
 105   // String converters
 106   static char*  as_utf8_string(oop java_string);
 107   static char*  as_utf8_string(oop java_string, char* buf, int buflen);
 108   static char*  as_utf8_string(oop java_string, int start, int len);
 109   static char*  as_platform_dependent_str(Handle java_string, TRAPS);
 110   static jchar* as_unicode_string(oop java_string, int& length);
 111 
 112   // Compute the hash value for a java.lang.String object which would
 113   // contain the characters passed in. This hash value is used for at
 114   // least two purposes.
 115   //
 116   // (a) As the hash value used by the StringTable for bucket selection
 117   //     and comparison (stored in the HashtableEntry structures).  This
 118   //     is used in the String.intern() method.
 119   //
 120   // (b) As the hash value used by the String object itself, in
 121   //     String.hashCode().  This value is normally calculate in Java code
 122   //     in the String.hashCode method(), but is precomputed for String
 123   //     objects in the shared archive file.
 124   //
 125   //     For this reason, THIS ALGORITHM MUST MATCH String.hashCode().
 126   static unsigned int hash_string(jchar* s, int len) {
 127     unsigned int h = 0;
 128     while (len-- > 0) {
 129       h = 31*h + (unsigned int) *s;
 130       s++;
 131     }
 132     return h;
 133   }
 134   static unsigned int hash_string(oop java_string);
 135 
 136   static bool equals(oop java_string, jchar* chars, int len);
 137 
 138   // Conversion between '.' and '/' formats
 139   static Handle externalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '/', '.', THREAD); }
 140   static Handle internalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '.', '/', THREAD); }
 141 
 142   // Conversion
 143   static Symbol* as_symbol(Handle java_string, TRAPS);
 144   static Symbol* as_symbol_or_null(oop java_string);
 145 
 146   // Testers
 147   static bool is_instance(oop obj) {
 148     return obj != NULL && obj->klass() == SystemDictionary::String_klass();
 149   }
 150 
 151   // Debugging
 152   static void print(Handle java_string, outputStream* st);
 153   friend class JavaClasses;
 154 };
 155 
 156 
 157 // Interface to java.lang.Class objects
 158 
 159 class java_lang_Class : AllStatic {
 160    friend class VMStructs;
 161  private:
 162   // The fake offsets are added by the class loader when java.lang.Class is loaded
 163 
 164   enum {
 165     hc_number_of_fake_oop_fields   = 3,
 166     hc_number_of_fake_int_fields   = 2
 167   };
 168 
 169   static int klass_offset;
 170   static int resolved_constructor_offset;
 171   static int array_klass_offset;
 172   static int number_of_fake_oop_fields;
 173 
 174   static int oop_size_offset;
 175   static int static_oop_field_count_offset;
 176 
 177   static void compute_offsets();
 178   static bool offsets_computed;
 179   static int classRedefinedCount_offset;
 180   static int parallelCapable_offset;
 181 
 182  public:
 183   // Instance creation
 184   static oop  create_mirror(KlassHandle k, TRAPS);
 185   static void fixup_mirror(KlassHandle k, TRAPS);
 186   static oop  create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS);
 187   // Conversion
 188   static klassOop as_klassOop(oop java_class);
 189   static BasicType as_BasicType(oop java_class, klassOop* reference_klass = NULL);
 190   static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) {
 191     klassOop refk_oop = NULL;
 192     BasicType result = as_BasicType(java_class, &refk_oop);
 193     (*reference_klass) = KlassHandle(refk_oop);
 194     return result;
 195   }
 196   static Symbol* as_signature(oop java_class, bool intern_if_not_found, TRAPS);
 197   static void print_signature(oop java_class, outputStream *st);
 198   // Testing
 199   static bool is_instance(oop obj) {
 200     return obj != NULL && obj->klass() == SystemDictionary::Class_klass();
 201   }
 202   static bool is_primitive(oop java_class);
 203   static BasicType primitive_type(oop java_class);
 204   static oop primitive_mirror(BasicType t);
 205   // JVM_NewInstance support
 206   static methodOop resolved_constructor(oop java_class);
 207   static void set_resolved_constructor(oop java_class, methodOop constructor);
 208   // JVM_NewArray support
 209   static klassOop array_klass(oop java_class);
 210   static void set_array_klass(oop java_class, klassOop klass);
 211   // compiler support for class operations
 212   static int klass_offset_in_bytes() { return klass_offset; }
 213   static int resolved_constructor_offset_in_bytes() { return resolved_constructor_offset; }
 214   static int array_klass_offset_in_bytes() { return array_klass_offset; }
 215   // Support for classRedefinedCount field
 216   static int classRedefinedCount(oop the_class_mirror);
 217   static void set_classRedefinedCount(oop the_class_mirror, int value);
 218   // Support for parallelCapable field
 219   static bool parallelCapable(oop the_class_mirror);
 220 
 221   static int oop_size(oop java_class);
 222   static void set_oop_size(oop java_class, int size);
 223   static int static_oop_field_count(oop java_class);
 224   static void set_static_oop_field_count(oop java_class, int size);
 225 
 226   // Debugging
 227   friend class JavaClasses;
 228   friend class instanceKlass;   // verification code accesses offsets
 229   friend class ClassFileParser; // access to number_of_fake_fields
 230 };
 231 
 232 // Interface to java.lang.Thread objects
 233 
 234 class java_lang_Thread : AllStatic {
 235  private:
 236   // Note that for this class the layout changed between JDK1.2 and JDK1.3,
 237   // so we compute the offsets at startup rather than hard-wiring them.
 238   static int _name_offset;
 239   static int _group_offset;
 240   static int _contextClassLoader_offset;
 241   static int _inheritedAccessControlContext_offset;
 242   static int _priority_offset;
 243   static int _eetop_offset;
 244   static int _daemon_offset;
 245   static int _stillborn_offset;
 246   static int _stackSize_offset;
 247   static int _tid_offset;
 248   static int _thread_status_offset;
 249   static int _park_blocker_offset;
 250   static int _park_event_offset ;
 251 
 252   static void compute_offsets();
 253 
 254  public:
 255   // Instance creation
 256   static oop create();
 257   // Returns the JavaThread associated with the thread obj
 258   static JavaThread* thread(oop java_thread);
 259   // Set JavaThread for instance
 260   static void set_thread(oop java_thread, JavaThread* thread);
 261   // Name
 262   static typeArrayOop name(oop java_thread);
 263   static void set_name(oop java_thread, typeArrayOop name);
 264   // Priority
 265   static ThreadPriority priority(oop java_thread);
 266   static void set_priority(oop java_thread, ThreadPriority priority);
 267   // Thread group
 268   static oop  threadGroup(oop java_thread);
 269   // Stillborn
 270   static bool is_stillborn(oop java_thread);
 271   static void set_stillborn(oop java_thread);
 272   // Alive (NOTE: this is not really a field, but provides the correct
 273   // definition without doing a Java call)
 274   static bool is_alive(oop java_thread);
 275   // Daemon
 276   static bool is_daemon(oop java_thread);
 277   static void set_daemon(oop java_thread);
 278   // Context ClassLoader
 279   static oop context_class_loader(oop java_thread);
 280   // Control context
 281   static oop inherited_access_control_context(oop java_thread);
 282   // Stack size hint
 283   static jlong stackSize(oop java_thread);
 284   // Thread ID
 285   static jlong thread_id(oop java_thread);
 286 
 287   // Blocker object responsible for thread parking
 288   static oop park_blocker(oop java_thread);
 289 
 290   // Pointer to type-stable park handler, encoded as jlong.
 291   // Should be set when apparently null
 292   // For details, see unsafe.cpp Unsafe_Unpark
 293   static jlong park_event(oop java_thread);
 294   static bool set_park_event(oop java_thread, jlong ptr);
 295 
 296   // Java Thread Status for JVMTI and M&M use.
 297   // This thread status info is saved in threadStatus field of
 298   // java.lang.Thread java class.
 299   enum ThreadStatus {
 300     NEW                      = 0,
 301     RUNNABLE                 = JVMTI_THREAD_STATE_ALIVE +          // runnable / running
 302                                JVMTI_THREAD_STATE_RUNNABLE,
 303     SLEEPING                 = JVMTI_THREAD_STATE_ALIVE +          // Thread.sleep()
 304                                JVMTI_THREAD_STATE_WAITING +
 305                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 306                                JVMTI_THREAD_STATE_SLEEPING,
 307     IN_OBJECT_WAIT           = JVMTI_THREAD_STATE_ALIVE +          // Object.wait()
 308                                JVMTI_THREAD_STATE_WAITING +
 309                                JVMTI_THREAD_STATE_WAITING_INDEFINITELY +
 310                                JVMTI_THREAD_STATE_IN_OBJECT_WAIT,
 311     IN_OBJECT_WAIT_TIMED     = JVMTI_THREAD_STATE_ALIVE +          // Object.wait(long)
 312                                JVMTI_THREAD_STATE_WAITING +
 313                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 314                                JVMTI_THREAD_STATE_IN_OBJECT_WAIT,
 315     PARKED                   = JVMTI_THREAD_STATE_ALIVE +          // LockSupport.park()
 316                                JVMTI_THREAD_STATE_WAITING +
 317                                JVMTI_THREAD_STATE_WAITING_INDEFINITELY +
 318                                JVMTI_THREAD_STATE_PARKED,
 319     PARKED_TIMED             = JVMTI_THREAD_STATE_ALIVE +          // LockSupport.park(long)
 320                                JVMTI_THREAD_STATE_WAITING +
 321                                JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT +
 322                                JVMTI_THREAD_STATE_PARKED,
 323     BLOCKED_ON_MONITOR_ENTER = JVMTI_THREAD_STATE_ALIVE +          // (re-)entering a synchronization block
 324                                JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER,
 325     TERMINATED               = JVMTI_THREAD_STATE_TERMINATED
 326   };
 327   // Write thread status info to threadStatus field of java.lang.Thread.
 328   static void set_thread_status(oop java_thread_oop, ThreadStatus status);
 329   // Read thread status info from threadStatus field of java.lang.Thread.
 330   static ThreadStatus get_thread_status(oop java_thread_oop);
 331 
 332   static const char*  thread_status_name(oop java_thread_oop);
 333 
 334   // Debugging
 335   friend class JavaClasses;
 336 };
 337 
 338 // Interface to java.lang.ThreadGroup objects
 339 
 340 class java_lang_ThreadGroup : AllStatic {
 341  private:
 342   static int _parent_offset;
 343   static int _name_offset;
 344   static int _threads_offset;
 345   static int _groups_offset;
 346   static int _maxPriority_offset;
 347   static int _destroyed_offset;
 348   static int _daemon_offset;
 349   static int _vmAllowSuspension_offset;
 350   static int _nthreads_offset;
 351   static int _ngroups_offset;
 352 
 353   static void compute_offsets();
 354 
 355  public:
 356   // parent ThreadGroup
 357   static oop  parent(oop java_thread_group);
 358   // name
 359   static typeArrayOop name(oop java_thread_group);
 360   // ("name as oop" accessor is not necessary)
 361   // Number of threads in group
 362   static int nthreads(oop java_thread_group);
 363   // threads
 364   static objArrayOop threads(oop java_thread_group);
 365   // Number of threads in group
 366   static int ngroups(oop java_thread_group);
 367   // groups
 368   static objArrayOop groups(oop java_thread_group);
 369   // maxPriority in group
 370   static ThreadPriority maxPriority(oop java_thread_group);
 371   // Destroyed
 372   static bool is_destroyed(oop java_thread_group);
 373   // Daemon
 374   static bool is_daemon(oop java_thread_group);
 375   // vmAllowSuspension
 376   static bool is_vmAllowSuspension(oop java_thread_group);
 377   // Debugging
 378   friend class JavaClasses;
 379 };
 380 
 381 
 382 
 383 // Interface to java.lang.Throwable objects
 384 
 385 class java_lang_Throwable: AllStatic {
 386   friend class BacktraceBuilder;
 387 
 388  private:
 389   // Offsets
 390   enum {
 391     hc_backtrace_offset     =  0,
 392     hc_detailMessage_offset =  1,
 393     hc_cause_offset         =  2,  // New since 1.4
 394     hc_stackTrace_offset    =  3   // New since 1.4
 395   };
 396   enum {
 397       hc_static_unassigned_stacktrace_offset = 0  // New since 1.7
 398   };
 399   // Trace constants
 400   enum {
 401     trace_methods_offset = 0,
 402     trace_bcis_offset    = 1,
 403     trace_next_offset    = 2,
 404     trace_size           = 3,
 405     trace_chunk_size     = 32
 406   };
 407 
 408   static int backtrace_offset;
 409   static int detailMessage_offset;
 410   static int cause_offset;
 411   static int stackTrace_offset;
 412   static int static_unassigned_stacktrace_offset;
 413 
 414   // Printing
 415   static char* print_stack_element_to_buffer(methodOop method, int bci);
 416   static void print_to_stream(Handle stream, const char* str);
 417   // StackTrace (programmatic access, new since 1.4)
 418   static void clear_stacktrace(oop throwable);
 419   // No stack trace available
 420   static const char* no_stack_trace_message();
 421   // Stacktrace (post JDK 1.7.0 to allow immutability protocol to be followed)
 422   static void set_stacktrace(oop throwable, oop st_element_array);
 423   static oop unassigned_stacktrace();
 424 
 425  public:
 426   // Backtrace
 427   static oop backtrace(oop throwable);
 428   static void set_backtrace(oop throwable, oop value);
 429   // Needed by JVMTI to filter out this internal field.
 430   static int get_backtrace_offset() { return backtrace_offset;}
 431   static int get_detailMessage_offset() { return detailMessage_offset;}
 432   // Message
 433   static oop message(oop throwable);
 434   static oop message(Handle throwable);
 435   static void set_message(oop throwable, oop value);
 436   // Print stack trace stored in exception by call-back to Java
 437   // Note: this is no longer used in Merlin, but we still suppport
 438   // it for compatibility.
 439   static void print_stack_trace(oop throwable, oop print_stream);
 440   static void print_stack_element(Handle stream, methodOop method, int bci);
 441   static void print_stack_element(outputStream *st, methodOop method, int bci);
 442   static void print_stack_usage(Handle stream);
 443 
 444   // Allocate space for backtrace (created but stack trace not filled in)
 445   static void allocate_backtrace(Handle throwable, TRAPS);
 446   // Fill in current stack trace for throwable with preallocated backtrace (no GC)
 447   static void fill_in_stack_trace_of_preallocated_backtrace(Handle throwable);
 448   // Fill in current stack trace, can cause GC
 449   static void fill_in_stack_trace(Handle throwable, methodHandle method, TRAPS);
 450   static void fill_in_stack_trace(Handle throwable, methodHandle method = methodHandle());
 451   // Programmatic access to stack trace
 452   static oop  get_stack_trace_element(oop throwable, int index, TRAPS);
 453   static int  get_stack_trace_depth(oop throwable, TRAPS);
 454   // Printing
 455   static void print(oop throwable, outputStream* st);
 456   static void print(Handle throwable, outputStream* st);
 457   static void print_stack_trace(oop throwable, outputStream* st);
 458   // Debugging
 459   friend class JavaClasses;
 460 };
 461 
 462 
 463 // Interface to java.lang.reflect.AccessibleObject objects
 464 
 465 class java_lang_reflect_AccessibleObject: AllStatic {
 466  private:
 467   // Note that to reduce dependencies on the JDK we compute these
 468   // offsets at run-time.
 469   static int override_offset;
 470 
 471   static void compute_offsets();
 472 
 473  public:
 474   // Accessors
 475   static jboolean override(oop reflect);
 476   static void set_override(oop reflect, jboolean value);
 477 
 478   // Debugging
 479   friend class JavaClasses;
 480 };
 481 
 482 
 483 // Interface to java.lang.reflect.Method objects
 484 
 485 class java_lang_reflect_Method : public java_lang_reflect_AccessibleObject {
 486  private:
 487   // Note that to reduce dependencies on the JDK we compute these
 488   // offsets at run-time.
 489   static int clazz_offset;
 490   static int name_offset;
 491   static int returnType_offset;
 492   static int parameterTypes_offset;
 493   static int exceptionTypes_offset;
 494   static int slot_offset;
 495   static int modifiers_offset;
 496   static int signature_offset;
 497   static int annotations_offset;
 498   static int parameter_annotations_offset;
 499   static int annotation_default_offset;
 500 
 501   static void compute_offsets();
 502 
 503  public:
 504   // Allocation
 505   static Handle create(TRAPS);
 506 
 507   // Accessors
 508   static oop clazz(oop reflect);
 509   static void set_clazz(oop reflect, oop value);
 510 
 511   static oop name(oop method);
 512   static void set_name(oop method, oop value);
 513 
 514   static oop return_type(oop method);
 515   static void set_return_type(oop method, oop value);
 516 
 517   static oop parameter_types(oop method);
 518   static void set_parameter_types(oop method, oop value);
 519 
 520   static oop exception_types(oop method);
 521   static void set_exception_types(oop method, oop value);
 522 
 523   static int slot(oop reflect);
 524   static void set_slot(oop reflect, int value);
 525 
 526   static int modifiers(oop method);
 527   static void set_modifiers(oop method, int value);
 528 
 529   static bool has_signature_field();
 530   static oop signature(oop method);
 531   static void set_signature(oop method, oop value);
 532 
 533   static bool has_annotations_field();
 534   static oop annotations(oop method);
 535   static void set_annotations(oop method, oop value);
 536 
 537   static bool has_parameter_annotations_field();
 538   static oop parameter_annotations(oop method);
 539   static void set_parameter_annotations(oop method, oop value);
 540 
 541   static bool has_annotation_default_field();
 542   static oop annotation_default(oop method);
 543   static void set_annotation_default(oop method, oop value);
 544 
 545   // Debugging
 546   friend class JavaClasses;
 547 };
 548 
 549 
 550 // Interface to java.lang.reflect.Constructor objects
 551 
 552 class java_lang_reflect_Constructor : public java_lang_reflect_AccessibleObject {
 553  private:
 554   // Note that to reduce dependencies on the JDK we compute these
 555   // offsets at run-time.
 556   static int clazz_offset;
 557   static int parameterTypes_offset;
 558   static int exceptionTypes_offset;
 559   static int slot_offset;
 560   static int modifiers_offset;
 561   static int signature_offset;
 562   static int annotations_offset;
 563   static int parameter_annotations_offset;
 564 
 565   static void compute_offsets();
 566 
 567  public:
 568   // Allocation
 569   static Handle create(TRAPS);
 570 
 571   // Accessors
 572   static oop clazz(oop reflect);
 573   static void set_clazz(oop reflect, oop value);
 574 
 575   static oop parameter_types(oop constructor);
 576   static void set_parameter_types(oop constructor, oop value);
 577 
 578   static oop exception_types(oop constructor);
 579   static void set_exception_types(oop constructor, oop value);
 580 
 581   static int slot(oop reflect);
 582   static void set_slot(oop reflect, int value);
 583 
 584   static int modifiers(oop constructor);
 585   static void set_modifiers(oop constructor, int value);
 586 
 587   static bool has_signature_field();
 588   static oop signature(oop constructor);
 589   static void set_signature(oop constructor, oop value);
 590 
 591   static bool has_annotations_field();
 592   static oop annotations(oop constructor);
 593   static void set_annotations(oop constructor, oop value);
 594 
 595   static bool has_parameter_annotations_field();
 596   static oop parameter_annotations(oop method);
 597   static void set_parameter_annotations(oop method, oop value);
 598 
 599   // Debugging
 600   friend class JavaClasses;
 601 };
 602 
 603 
 604 // Interface to java.lang.reflect.Field objects
 605 
 606 class java_lang_reflect_Field : public java_lang_reflect_AccessibleObject {
 607  private:
 608   // Note that to reduce dependencies on the JDK we compute these
 609   // offsets at run-time.
 610   static int clazz_offset;
 611   static int name_offset;
 612   static int type_offset;
 613   static int slot_offset;
 614   static int modifiers_offset;
 615   static int signature_offset;
 616   static int 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 name(oop field);
 629   static void set_name(oop field, oop value);
 630 
 631   static oop type(oop field);
 632   static void set_type(oop field, oop value);
 633 
 634   static int slot(oop reflect);
 635   static void set_slot(oop reflect, int value);
 636 
 637   static int modifiers(oop field);
 638   static void set_modifiers(oop field, 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_annotation_default_field();
 653   static oop annotation_default(oop method);
 654   static void set_annotation_default(oop method, oop value);
 655 
 656   // Debugging
 657   friend class JavaClasses;
 658 };
 659 
 660 // Interface to sun.reflect.ConstantPool objects
 661 class sun_reflect_ConstantPool {
 662  private:
 663   // Note that to reduce dependencies on the JDK we compute these
 664   // offsets at run-time.
 665   static int _cp_oop_offset;
 666 
 667   static void compute_offsets();
 668 
 669  public:
 670   // Allocation
 671   static Handle create(TRAPS);
 672 
 673   // Accessors
 674   static oop cp_oop(oop reflect);
 675   static void set_cp_oop(oop reflect, oop value);
 676   static int cp_oop_offset() {
 677     return _cp_oop_offset;
 678   }
 679 
 680   // Debugging
 681   friend class JavaClasses;
 682 };
 683 
 684 // Interface to sun.reflect.UnsafeStaticFieldAccessorImpl objects
 685 class sun_reflect_UnsafeStaticFieldAccessorImpl {
 686  private:
 687   static int _base_offset;
 688   static void compute_offsets();
 689 
 690  public:
 691   static int base_offset() {
 692     return _base_offset;
 693   }
 694 
 695   // Debugging
 696   friend class JavaClasses;
 697 };
 698 
 699 // Interface to java.lang primitive type boxing objects:
 700 //  - java.lang.Boolean
 701 //  - java.lang.Character
 702 //  - java.lang.Float
 703 //  - java.lang.Double
 704 //  - java.lang.Byte
 705 //  - java.lang.Short
 706 //  - java.lang.Integer
 707 //  - java.lang.Long
 708 
 709 // This could be separated out into 8 individual classes.
 710 
 711 class java_lang_boxing_object: AllStatic {
 712  private:
 713   enum {
 714    hc_value_offset = 0
 715   };
 716   static int value_offset;
 717   static int long_value_offset;
 718 
 719   static oop initialize_and_allocate(BasicType type, TRAPS);
 720  public:
 721   // Allocation. Returns a boxed value, or NULL for invalid type.
 722   static oop create(BasicType type, jvalue* value, TRAPS);
 723   // Accessors. Returns the basic type being boxed, or T_ILLEGAL for invalid oop.
 724   static BasicType get_value(oop box, jvalue* value);
 725   static BasicType set_value(oop box, jvalue* value);
 726   static BasicType basic_type(oop box);
 727   static bool is_instance(oop box)                 { return basic_type(box) != T_ILLEGAL; }
 728   static bool is_instance(oop box, BasicType type) { return basic_type(box) == type; }
 729   static void print(oop box, outputStream* st)     { jvalue value;  print(get_value(box, &value), &value, st); }
 730   static void print(BasicType type, jvalue* value, outputStream* st);
 731 
 732   static int value_offset_in_bytes(BasicType type) {
 733     return ( type == T_LONG || type == T_DOUBLE ) ? long_value_offset :
 734                                                     value_offset;
 735   }
 736 
 737   // Debugging
 738   friend class JavaClasses;
 739 };
 740 
 741 
 742 
 743 // Interface to java.lang.ref.Reference objects
 744 
 745 class java_lang_ref_Reference: AllStatic {
 746  public:
 747   enum {
 748    hc_referent_offset   = 0,
 749    hc_queue_offset      = 1,
 750    hc_next_offset       = 2,
 751    hc_discovered_offset = 3  // Is not last, see SoftRefs.
 752   };
 753   enum {
 754    hc_static_lock_offset    = 0,
 755    hc_static_pending_offset = 1
 756   };
 757 
 758   static int referent_offset;
 759   static int queue_offset;
 760   static int next_offset;
 761   static int discovered_offset;
 762   static int static_lock_offset;
 763   static int static_pending_offset;
 764   static int number_of_fake_oop_fields;
 765 
 766   // Accessors
 767   static oop referent(oop ref) {
 768     return ref->obj_field(referent_offset);
 769   }
 770   static void set_referent(oop ref, oop value) {
 771     ref->obj_field_put(referent_offset, value);
 772   }
 773   static void set_referent_raw(oop ref, oop value) {
 774     ref->obj_field_raw_put(referent_offset, value);
 775   }
 776   static HeapWord* referent_addr(oop ref) {
 777     return ref->obj_field_addr<HeapWord>(referent_offset);
 778   }
 779   static oop next(oop ref) {
 780     return ref->obj_field(next_offset);
 781   }
 782   static void set_next(oop ref, oop value) {
 783     ref->obj_field_put(next_offset, value);
 784   }
 785   static void set_next_raw(oop ref, oop value) {
 786     ref->obj_field_raw_put(next_offset, value);
 787   }
 788   static HeapWord* next_addr(oop ref) {
 789     return ref->obj_field_addr<HeapWord>(next_offset);
 790   }
 791   static oop discovered(oop ref) {
 792     return ref->obj_field(discovered_offset);
 793   }
 794   static void set_discovered(oop ref, oop value) {
 795     ref->obj_field_put(discovered_offset, value);
 796   }
 797   static void set_discovered_raw(oop ref, oop value) {
 798     ref->obj_field_raw_put(discovered_offset, value);
 799   }
 800   static HeapWord* discovered_addr(oop ref) {
 801     return ref->obj_field_addr<HeapWord>(discovered_offset);
 802   }
 803   // Accessors for statics
 804   static oop  pending_list_lock();
 805   static oop  pending_list();
 806 
 807   static HeapWord*  pending_list_addr();
 808 };
 809 
 810 
 811 // Interface to java.lang.ref.SoftReference objects
 812 
 813 class java_lang_ref_SoftReference: public java_lang_ref_Reference {
 814  public:
 815   enum {
 816    // The timestamp is a long field and may need to be adjusted for alignment.
 817    hc_timestamp_offset  = hc_discovered_offset + 1
 818   };
 819   enum {
 820    hc_static_clock_offset = 0
 821   };
 822 
 823   static int timestamp_offset;
 824   static int static_clock_offset;
 825 
 826   // Accessors
 827   static jlong timestamp(oop ref);
 828 
 829   // Accessors for statics
 830   static jlong clock();
 831   static void set_clock(jlong value);
 832 };
 833 
 834 
 835 // Interface to java.lang.invoke.MethodHandle objects
 836 
 837 class MethodHandleEntry;
 838 
 839 class java_lang_invoke_MethodHandle: AllStatic {
 840   friend class JavaClasses;
 841 
 842  private:
 843   static int _vmentry_offset;           // assembly code trampoline for MH
 844   static int _vmtarget_offset;          // class-specific target reference
 845   static int _type_offset;              // the MethodType of this MH
 846   static int _vmslots_offset;           // OPTIONAL hoisted type.form.vmslots
 847 
 848   static void compute_offsets();
 849 
 850  public:
 851   // Accessors
 852   static oop            type(oop mh);
 853   static void       set_type(oop mh, oop mtype);
 854 
 855   static oop            vmtarget(oop mh);
 856   static void       set_vmtarget(oop mh, oop target);
 857 
 858   static MethodHandleEntry* vmentry(oop mh);
 859   static void       set_vmentry(oop mh, MethodHandleEntry* data);
 860 
 861   static int            vmslots(oop mh);
 862   static void      init_vmslots(oop mh);
 863   static int    compute_vmslots(oop mh);
 864 
 865   // Testers
 866   static bool is_subclass(klassOop klass) {
 867     return Klass::cast(klass)->is_subclass_of(SystemDictionary::MethodHandle_klass());
 868   }
 869   static bool is_instance(oop obj) {
 870     return obj != NULL && is_subclass(obj->klass());
 871   }
 872 
 873   // Accessors for code generation:
 874   static int type_offset_in_bytes()             { return _type_offset; }
 875   static int vmtarget_offset_in_bytes()         { return _vmtarget_offset; }
 876   static int vmentry_offset_in_bytes()          { return _vmentry_offset; }
 877   static int vmslots_offset_in_bytes()          { return _vmslots_offset; }
 878 };
 879 
 880 class java_lang_invoke_DirectMethodHandle: public java_lang_invoke_MethodHandle {
 881   friend class JavaClasses;
 882 
 883  private:
 884   //         _vmtarget_offset;          // method   or class      or interface
 885   static int _vmindex_offset;           // negative or vtable idx or itable idx
 886   static void compute_offsets();
 887 
 888  public:
 889   // Accessors
 890   static int            vmindex(oop mh);
 891   static void       set_vmindex(oop mh, int index);
 892 
 893   // Testers
 894   static bool is_subclass(klassOop klass) {
 895     return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_klass());
 896   }
 897   static bool is_instance(oop obj) {
 898     return obj != NULL && is_subclass(obj->klass());
 899   }
 900 
 901   // Accessors for code generation:
 902   static int vmindex_offset_in_bytes()          { return _vmindex_offset; }
 903 };
 904 
 905 class java_lang_invoke_BoundMethodHandle: public java_lang_invoke_MethodHandle {
 906   friend class JavaClasses;
 907 
 908  private:
 909   static int _argument_offset;          // argument value bound into this MH
 910   static int _vmargslot_offset;         // relevant argument slot (<= vmslots)
 911   static void compute_offsets();
 912 
 913 public:
 914   static oop            argument(oop mh);
 915   static void       set_argument(oop mh, oop ref);
 916 
 917   static jint           vmargslot(oop mh);
 918   static void       set_vmargslot(oop mh, jint slot);
 919 
 920   // Testers
 921   static bool is_subclass(klassOop klass) {
 922     return Klass::cast(klass)->is_subclass_of(SystemDictionary::BoundMethodHandle_klass());
 923   }
 924   static bool is_instance(oop obj) {
 925     return obj != NULL && is_subclass(obj->klass());
 926   }
 927 
 928   static int argument_offset_in_bytes()         { return _argument_offset; }
 929   static int vmargslot_offset_in_bytes()        { return _vmargslot_offset; }
 930 };
 931 
 932 class java_lang_invoke_AdapterMethodHandle: public java_lang_invoke_BoundMethodHandle {
 933   friend class JavaClasses;
 934 
 935  private:
 936   static int _conversion_offset;        // type of conversion to apply
 937   static void compute_offsets();
 938 
 939  public:
 940   static int            conversion(oop mh);
 941   static void       set_conversion(oop mh, int conv);
 942 
 943   // Testers
 944   static bool is_subclass(klassOop klass) {
 945     return Klass::cast(klass)->is_subclass_of(SystemDictionary::AdapterMethodHandle_klass());
 946   }
 947   static bool is_instance(oop obj) {
 948     return obj != NULL && is_subclass(obj->klass());
 949   }
 950 
 951   // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants):
 952   enum {
 953     OP_RETYPE_ONLY   = 0x0, // no argument changes; straight retype
 954     OP_RETYPE_RAW    = 0x1, // straight retype, trusted (void->int, Object->T)
 955     OP_CHECK_CAST    = 0x2, // ref-to-ref conversion; requires a Class argument
 956     OP_PRIM_TO_PRIM  = 0x3, // converts from one primitive to another
 957     OP_REF_TO_PRIM   = 0x4, // unboxes a wrapper to produce a primitive
 958     OP_PRIM_TO_REF   = 0x5, // boxes a primitive into a wrapper
 959     OP_SWAP_ARGS     = 0x6, // swap arguments (vminfo is 2nd arg)
 960     OP_ROT_ARGS      = 0x7, // rotate arguments (vminfo is displaced arg)
 961     OP_DUP_ARGS      = 0x8, // duplicates one or more arguments (at TOS)
 962     OP_DROP_ARGS     = 0x9, // remove one or more argument slots
 963     OP_COLLECT_ARGS  = 0xA, // combine arguments using an auxiliary function
 964     OP_SPREAD_ARGS   = 0xB, // expand in place a varargs array (of known size)
 965     OP_FOLD_ARGS     = 0xC, // combine but do not remove arguments; prepend result
 966     //OP_UNUSED_13   = 0xD, // unused code, perhaps for reified argument lists
 967     CONV_OP_LIMIT    = 0xE, // limit of CONV_OP enumeration
 968 
 969     CONV_OP_MASK     = 0xF00, // this nybble contains the conversion op field
 970     CONV_TYPE_MASK   = 0x0F,  // fits T_ADDRESS and below
 971     CONV_VMINFO_MASK = 0x0FF, // LSB is reserved for JVM use
 972     CONV_VMINFO_SHIFT     =  0, // position of bits in CONV_VMINFO_MASK
 973     CONV_OP_SHIFT         =  8, // position of bits in CONV_OP_MASK
 974     CONV_DEST_TYPE_SHIFT  = 12, // byte 2 has the adapter BasicType (if needed)
 975     CONV_SRC_TYPE_SHIFT   = 16, // byte 2 has the source BasicType (if needed)
 976     CONV_STACK_MOVE_SHIFT = 20, // high 12 bits give signed SP change
 977     CONV_STACK_MOVE_MASK  = (1 << (32 - CONV_STACK_MOVE_SHIFT)) - 1
 978   };
 979 
 980   static int conversion_offset_in_bytes()       { return _conversion_offset; }
 981 };
 982 
 983 
 984 // A simple class that maintains an invocation count
 985 class java_lang_invoke_CountingMethodHandle: public java_lang_invoke_MethodHandle {
 986   friend class JavaClasses;
 987 
 988  private:
 989   static int _vmcount_offset;
 990   static void compute_offsets();
 991 
 992  public:
 993   // Accessors
 994   static int            vmcount(oop mh);
 995   static void       set_vmcount(oop mh, int count);
 996 
 997   // Testers
 998   static bool is_subclass(klassOop klass) {
 999     return SystemDictionary::CountingMethodHandle_klass() != NULL &&
1000       Klass::cast(klass)->is_subclass_of(SystemDictionary::CountingMethodHandle_klass());
1001   }
1002   static bool is_instance(oop obj) {
1003     return obj != NULL && is_subclass(obj->klass());
1004   }
1005 
1006   // Accessors for code generation:
1007   static int vmcount_offset_in_bytes()          { return _vmcount_offset; }
1008 };
1009 
1010 
1011 
1012 // Interface to java.lang.invoke.MemberName objects
1013 // (These are a private interface for Java code to query the class hierarchy.)
1014 
1015 class java_lang_invoke_MemberName: AllStatic {
1016   friend class JavaClasses;
1017 
1018  private:
1019   // From java.lang.invoke.MemberName:
1020   //    private Class<?>   clazz;       // class in which the method is defined
1021   //    private String     name;        // may be null if not yet materialized
1022   //    private Object     type;        // may be null if not yet materialized
1023   //    private int        flags;       // modifier bits; see reflect.Modifier
1024   //    private Object     vmtarget;    // VM-specific target value
1025   //    private int        vmindex;     // method index within class or interface
1026   static int _clazz_offset;
1027   static int _name_offset;
1028   static int _type_offset;
1029   static int _flags_offset;
1030   static int _vmtarget_offset;
1031   static int _vmindex_offset;
1032 
1033   static void compute_offsets();
1034 
1035  public:
1036   // Accessors
1037   static oop            clazz(oop mname);
1038   static void       set_clazz(oop mname, oop clazz);
1039 
1040   static oop            type(oop mname);
1041   static void       set_type(oop mname, oop type);
1042 
1043   static oop            name(oop mname);
1044   static void       set_name(oop mname, oop name);
1045 
1046   static int            flags(oop mname);
1047   static void       set_flags(oop mname, int flags);
1048 
1049   static int            modifiers(oop mname) { return (u2) flags(mname); }
1050   static void       set_modifiers(oop mname, int mods)
1051                                 { set_flags(mname, (flags(mname) &~ (u2)-1) | (u2)mods); }
1052 
1053   static oop            vmtarget(oop mname);
1054   static void       set_vmtarget(oop mname, oop target);
1055 
1056   static int            vmindex(oop mname);
1057   static void       set_vmindex(oop mname, int index);
1058 
1059   // Testers
1060   static bool is_subclass(klassOop klass) {
1061     return Klass::cast(klass)->is_subclass_of(SystemDictionary::MemberName_klass());
1062   }
1063   static bool is_instance(oop obj) {
1064     return obj != NULL && is_subclass(obj->klass());
1065   }
1066 
1067   // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants):
1068   enum {
1069     MN_IS_METHOD           = 0x00010000, // method (not constructor)
1070     MN_IS_CONSTRUCTOR      = 0x00020000, // constructor
1071     MN_IS_FIELD            = 0x00040000, // field
1072     MN_IS_TYPE             = 0x00080000, // nested type
1073     MN_SEARCH_SUPERCLASSES = 0x00100000, // for MHN.getMembers
1074     MN_SEARCH_INTERFACES   = 0x00200000, // for MHN.getMembers
1075     VM_INDEX_UNINITIALIZED = -99
1076   };
1077 
1078   // Accessors for code generation:
1079   static int clazz_offset_in_bytes()            { return _clazz_offset; }
1080   static int type_offset_in_bytes()             { return _type_offset; }
1081   static int name_offset_in_bytes()             { return _name_offset; }
1082   static int flags_offset_in_bytes()            { return _flags_offset; }
1083   static int vmtarget_offset_in_bytes()         { return _vmtarget_offset; }
1084   static int vmindex_offset_in_bytes()          { return _vmindex_offset; }
1085 };
1086 
1087 
1088 // Interface to java.lang.invoke.MethodType objects
1089 
1090 class java_lang_invoke_MethodType: AllStatic {
1091   friend class JavaClasses;
1092 
1093  private:
1094   static int _rtype_offset;
1095   static int _ptypes_offset;
1096   static int _form_offset;
1097 
1098   static void compute_offsets();
1099 
1100  public:
1101   // Accessors
1102   static oop            rtype(oop mt);
1103   static objArrayOop    ptypes(oop mt);
1104   static oop            form(oop mt);
1105 
1106   static oop            ptype(oop mt, int index);
1107   static int            ptype_count(oop mt);
1108 
1109   static Symbol*        as_signature(oop mt, bool intern_if_not_found, TRAPS);
1110   static void           print_signature(oop mt, outputStream* st);
1111 
1112   static bool is_instance(oop obj) {
1113     return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass();
1114   }
1115 
1116   static bool equals(oop mt1, oop mt2);
1117 
1118   // Accessors for code generation:
1119   static int rtype_offset_in_bytes()            { return _rtype_offset; }
1120   static int ptypes_offset_in_bytes()           { return _ptypes_offset; }
1121   static int form_offset_in_bytes()             { return _form_offset; }
1122 };
1123 
1124 class java_lang_invoke_MethodTypeForm: AllStatic {
1125   friend class JavaClasses;
1126 
1127  private:
1128   static int _vmslots_offset;           // number of argument slots needed
1129   static int _vmlayout_offset;          // object describing internal calling sequence
1130   static int _erasedType_offset;        // erasedType = canonical MethodType
1131   static int _genericInvoker_offset;    // genericInvoker = adapter for invokeGeneric
1132 
1133   static void compute_offsets();
1134 
1135  public:
1136   // Accessors
1137   static int            vmslots(oop mtform);
1138   static oop            erasedType(oop mtform);
1139   static oop            genericInvoker(oop mtform);
1140 
1141   static oop            vmlayout(oop mtform);
1142   static oop       init_vmlayout(oop mtform, oop cookie);
1143 
1144   // Accessors for code generation:
1145   static int vmslots_offset_in_bytes()          { return _vmslots_offset; }
1146   static int vmlayout_offset_in_bytes()         { return _vmlayout_offset; }
1147   static int erasedType_offset_in_bytes()       { return _erasedType_offset; }
1148   static int genericInvoker_offset_in_bytes()   { return _genericInvoker_offset; }
1149 };
1150 
1151 
1152 // Interface to java.lang.invoke.CallSite objects
1153 
1154 class java_lang_invoke_CallSite: AllStatic {
1155   friend class JavaClasses;
1156 
1157 private:
1158   static int _target_offset;
1159   static int _caller_method_offset;
1160   static int _caller_bci_offset;
1161 
1162   static void compute_offsets();
1163 
1164 public:
1165   // Accessors
1166   static oop            target(oop site);
1167   static void       set_target(oop site, oop target);
1168 
1169   static oop            caller_method(oop site);
1170   static void       set_caller_method(oop site, oop ref);
1171 
1172   static jint           caller_bci(oop site);
1173   static void       set_caller_bci(oop site, jint bci);
1174 
1175   // Testers
1176   static bool is_subclass(klassOop klass) {
1177     return Klass::cast(klass)->is_subclass_of(SystemDictionary::CallSite_klass());
1178   }
1179   static bool is_instance(oop obj) {
1180     return obj != NULL && is_subclass(obj->klass());
1181   }
1182 
1183   // Accessors for code generation:
1184   static int target_offset_in_bytes()           { return _target_offset; }
1185   static int caller_method_offset_in_bytes()    { return _caller_method_offset; }
1186   static int caller_bci_offset_in_bytes()       { return _caller_bci_offset; }
1187 };
1188 
1189 
1190 // Interface to java.security.AccessControlContext objects
1191 
1192 class java_security_AccessControlContext: AllStatic {
1193  private:
1194   // Note that for this class the layout changed between JDK1.2 and JDK1.3,
1195   // so we compute the offsets at startup rather than hard-wiring them.
1196   static int _context_offset;
1197   static int _privilegedContext_offset;
1198   static int _isPrivileged_offset;
1199 
1200   static void compute_offsets();
1201  public:
1202   static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS);
1203 
1204   // Debugging/initialization
1205   friend class JavaClasses;
1206 };
1207 
1208 
1209 // Interface to java.lang.ClassLoader objects
1210 
1211 class java_lang_ClassLoader : AllStatic {
1212  private:
1213   enum {
1214    hc_parent_offset = 0
1215   };
1216 
1217   static int parent_offset;
1218 
1219  public:
1220   static oop parent(oop loader);
1221 
1222   static bool is_trusted_loader(oop loader);
1223 
1224   // Fix for 4474172
1225   static oop  non_reflection_class_loader(oop loader);
1226 
1227   // Debugging
1228   friend class JavaClasses;
1229 };
1230 
1231 
1232 // Interface to java.lang.System objects
1233 
1234 class java_lang_System : AllStatic {
1235  private:
1236   enum {
1237    hc_static_in_offset  = 0,
1238    hc_static_out_offset = 1,
1239    hc_static_err_offset = 2
1240   };
1241 
1242   static int  static_in_offset;
1243   static int static_out_offset;
1244   static int static_err_offset;
1245 
1246  public:
1247   static int  in_offset_in_bytes();
1248   static int out_offset_in_bytes();
1249   static int err_offset_in_bytes();
1250 
1251   // Debugging
1252   friend class JavaClasses;
1253 };
1254 
1255 
1256 // Interface to java.lang.StackTraceElement objects
1257 
1258 class java_lang_StackTraceElement: AllStatic {
1259  private:
1260   enum {
1261     hc_declaringClass_offset  = 0,
1262     hc_methodName_offset = 1,
1263     hc_fileName_offset   = 2,
1264     hc_lineNumber_offset = 3
1265   };
1266 
1267   static int declaringClass_offset;
1268   static int methodName_offset;
1269   static int fileName_offset;
1270   static int lineNumber_offset;
1271 
1272  public:
1273   // Setters
1274   static void set_declaringClass(oop element, oop value);
1275   static void set_methodName(oop element, oop value);
1276   static void set_fileName(oop element, oop value);
1277   static void set_lineNumber(oop element, int value);
1278 
1279   // Create an instance of StackTraceElement
1280   static oop create(methodHandle m, int bci, TRAPS);
1281 
1282   // Debugging
1283   friend class JavaClasses;
1284 };
1285 
1286 
1287 // Interface to java.lang.AssertionStatusDirectives objects
1288 
1289 class java_lang_AssertionStatusDirectives: AllStatic {
1290  private:
1291   enum {
1292     hc_classes_offset,
1293     hc_classEnabled_offset,
1294     hc_packages_offset,
1295     hc_packageEnabled_offset,
1296     hc_deflt_offset
1297   };
1298 
1299   static int classes_offset;
1300   static int classEnabled_offset;
1301   static int packages_offset;
1302   static int packageEnabled_offset;
1303   static int deflt_offset;
1304 
1305  public:
1306   // Setters
1307   static void set_classes(oop obj, oop val);
1308   static void set_classEnabled(oop obj, oop val);
1309   static void set_packages(oop obj, oop val);
1310   static void set_packageEnabled(oop obj, oop val);
1311   static void set_deflt(oop obj, bool val);
1312   // Debugging
1313   friend class JavaClasses;
1314 };
1315 
1316 
1317 class java_nio_Buffer: AllStatic {
1318  private:
1319   static int _limit_offset;
1320 
1321  public:
1322   static int  limit_offset();
1323   static void compute_offsets();
1324 };
1325 
1326 class sun_misc_AtomicLongCSImpl: AllStatic {
1327  private:
1328   static int _value_offset;
1329 
1330  public:
1331   static int  value_offset();
1332   static void compute_offsets();
1333 };
1334 
1335 class java_util_concurrent_locks_AbstractOwnableSynchronizer : AllStatic {
1336  private:
1337   static int  _owner_offset;
1338  public:
1339   static void initialize(TRAPS);
1340   static oop  get_owner_threadObj(oop obj);
1341 };
1342 
1343 // Interface to hard-coded offset checking
1344 
1345 class JavaClasses : AllStatic {
1346  private:
1347   static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1348   static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1349   static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0;
1350  public:
1351   static void compute_hard_coded_offsets();
1352   static void compute_offsets();
1353   static void check_offsets() PRODUCT_RETURN;
1354 };
1355 
1356 #endif // SHARE_VM_CLASSFILE_JAVACLASSES_HPP