javaClasses.hpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1997, 2012, 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 53class 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); 157 158 // Compute the hash value for a java.lang.String object which would 159 // contain the characters passed in. 160 // 161 // As the hash value used by the String object itself, in 162 // String.hashCode(). This value is normally calculated in Java code 163 // in the String.hashCode method(), but is precomputed for String 164 // objects in the shared archive file. 165 // hash P(31) from Kernighan & Ritchie 166 // 167 // For this reason, THIS ALGORITHM MUST MATCH String.toHash(). 168 template <typename T> static unsigned int to_hash(T* s, int len) { 169 unsigned int h = 0; 170 while (len-- > 0) { 171 h = 31*h + (unsigned int) *s; 172 s++; 173 } 174 return h; 175 } 176 static unsigned int to_hash(oop java_string); 177 178 // This is the string hash code used by the StringTable, which may be 179 // the same as String.toHash or an alternate hash code. 180 static unsigned int hash_string(oop java_string); 181 182 static bool equals(oop java_string, jchar* chars, int len); 183 184 // Conversion between '.' and '/' formats 185 static Handle externalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '/', '.', THREAD); } 186 static Handle internalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '.', '/', THREAD); } 187 188 // Conversion 189 static Symbol* as_symbol(Handle java_string, TRAPS); 190 static Symbol* as_symbol_or_null(oop java_string); 191 192 // Testers 193 static bool is_instance(oop obj) { 194 return obj != NULL && obj->klass() == SystemDictionary::String_klass(); 195 } 196 197 // Debugging 198 static void print(Handle java_string, outputStream* st); 199 friend class JavaClasses; 200}; 201 202 203// Interface to java.lang.Class objects 204 205#define CLASS_INJECTED_FIELDS(macro) \ 206 macro(java_lang_Class, klass, intptr_signature, false) \ 207 macro(java_lang_Class, resolved_constructor, intptr_signature, false) \ 208 macro(java_lang_Class, array_klass, intptr_signature, false) \ 209 macro(java_lang_Class, oop_size, int_signature, false) \ 210 macro(java_lang_Class, static_oop_field_count, int_signature, false) 211 212class java_lang_Class : AllStatic { 213 friend class VMStructs; 214 215 private: 216 // The fake offsets are added by the class loader when java.lang.Class is loaded 217 218 static int _klass_offset; 219 static int _resolved_constructor_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_NewInstance support 256 static Method* resolved_constructor(oop java_class); 257 static void set_resolved_constructor(oop java_class, Method* constructor); 258 // JVM_NewArray support 259 static Klass* array_klass(oop java_class); 260 static void set_array_klass(oop java_class, Klass* klass); 261 // compiler support for class operations 262 static int klass_offset_in_bytes() { return _klass_offset; } 263 static int resolved_constructor_offset_in_bytes() { return _resolved_constructor_offset; } 264 static int array_klass_offset_in_bytes() { return _array_klass_offset; } 265 // Support for classRedefinedCount field 266 static int classRedefinedCount(oop the_class_mirror); 267 static void set_classRedefinedCount(oop the_class_mirror, int value); 268 269 static int oop_size(oop java_class); 270 static void set_oop_size(oop java_class, int size); 271 static int static_oop_field_count(oop java_class); 272 static void set_static_oop_field_count(oop java_class, int size); 273 274 static GrowableArray<Klass*>* fixup_mirror_list() { 275 return _fixup_mirror_list; 276 } 277 static void set_fixup_mirror_list(GrowableArray<Klass*>* v) { 278 _fixup_mirror_list = v; 279 } 280 // Debugging 281 friend class JavaClasses; 282 friend class InstanceKlass; // verification code accesses offsets 283 friend class ClassFileParser; // access to number_of_fake_fields 284}; 285 286// Interface to java.lang.Thread objects 287 288class java_lang_Thread : AllStatic { 289 private: 290 // Note that for this class the layout changed between JDK1.2 and JDK1.3, 291 // so we compute the offsets at startup rather than hard-wiring them. 292 static int _name_offset; 293 static int _group_offset; 294 static int _contextClassLoader_offset; 295 static int _inheritedAccessControlContext_offset; 296 static int _priority_offset; 297 static int _eetop_offset; 298 static int _daemon_offset; 299 static int _stillborn_offset; 300 static int _stackSize_offset; 301 static int _tid_offset; 302 static int _thread_status_offset; 303 static int _park_blocker_offset; 304 static int _park_event_offset ; 305 306 static void compute_offsets(); 307 308 public: 309 // Instance creation 310 static oop create(); 311 // Returns the JavaThread associated with the thread obj 312 static JavaThread* thread(oop java_thread); 313 // Set JavaThread for instance 314 static void set_thread(oop java_thread, JavaThread* thread); 315 // Name 316 static typeArrayOop name(oop java_thread); 317 static void set_name(oop java_thread, typeArrayOop name); 318 // Priority 319 static ThreadPriority priority(oop java_thread); 320 static void set_priority(oop java_thread, ThreadPriority priority); 321 // Thread group 322 static oop threadGroup(oop java_thread); 323 // Stillborn 324 static bool is_stillborn(oop java_thread); 325 static void set_stillborn(oop java_thread); 326 // Alive (NOTE: this is not really a field, but provides the correct 327 // definition without doing a Java call) 328 static bool is_alive(oop java_thread); 329 // Daemon 330 static bool is_daemon(oop java_thread); 331 static void set_daemon(oop java_thread); 332 // Context ClassLoader 333 static oop context_class_loader(oop java_thread); 334 // Control context 335 static oop inherited_access_control_context(oop java_thread); 336 // Stack size hint 337 static jlong stackSize(oop java_thread); 338 // Thread ID 339 static jlong thread_id(oop java_thread); 340 341 // Blocker object responsible for thread parking 342 static oop park_blocker(oop java_thread); 343 344 // Pointer to type-stable park handler, encoded as jlong. 345 // Should be set when apparently null 346 // For details, see unsafe.cpp Unsafe_Unpark 347 static jlong park_event(oop java_thread); 348 static bool set_park_event(oop java_thread, jlong ptr); 349 350 // Java Thread Status for JVMTI and M&M use. 351 // This thread status info is saved in threadStatus field of 352 // java.lang.Thread java class. 353 enum ThreadStatus { 354 NEW = 0, 355 RUNNABLE = JVMTI_THREAD_STATE_ALIVE + // runnable / running 356 JVMTI_THREAD_STATE_RUNNABLE, 357 SLEEPING = JVMTI_THREAD_STATE_ALIVE + // Thread.sleep() 358 JVMTI_THREAD_STATE_WAITING + 359 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 360 JVMTI_THREAD_STATE_SLEEPING, 361 IN_OBJECT_WAIT = JVMTI_THREAD_STATE_ALIVE + // Object.wait() 362 JVMTI_THREAD_STATE_WAITING + 363 JVMTI_THREAD_STATE_WAITING_INDEFINITELY + 364 JVMTI_THREAD_STATE_IN_OBJECT_WAIT, 365 IN_OBJECT_WAIT_TIMED = JVMTI_THREAD_STATE_ALIVE + // Object.wait(long) 366 JVMTI_THREAD_STATE_WAITING + 367 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 368 JVMTI_THREAD_STATE_IN_OBJECT_WAIT, 369 PARKED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park() 370 JVMTI_THREAD_STATE_WAITING + 371 JVMTI_THREAD_STATE_WAITING_INDEFINITELY + 372 JVMTI_THREAD_STATE_PARKED, 373 PARKED_TIMED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park(long) 374 JVMTI_THREAD_STATE_WAITING + 375 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 376 JVMTI_THREAD_STATE_PARKED, 377 BLOCKED_ON_MONITOR_ENTER = JVMTI_THREAD_STATE_ALIVE + // (re-)entering a synchronization block 378 JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER, 379 TERMINATED = JVMTI_THREAD_STATE_TERMINATED 380 }; 381 // Write thread status info to threadStatus field of java.lang.Thread. 382 static void set_thread_status(oop java_thread_oop, ThreadStatus status); 383 // Read thread status info from threadStatus field of java.lang.Thread. 384 static ThreadStatus get_thread_status(oop java_thread_oop); 385 386 static const char* thread_status_name(oop java_thread_oop); 387 388 // Debugging 389 friend class JavaClasses; 390}; 391 392// Interface to java.lang.ThreadGroup objects 393 394class java_lang_ThreadGroup : AllStatic { 395 private: 396 static int _parent_offset; 397 static int _name_offset; 398 static int _threads_offset; 399 static int _groups_offset; 400 static int _maxPriority_offset; 401 static int _destroyed_offset; 402 static int _daemon_offset; 403 static int _vmAllowSuspension_offset; 404 static int _nthreads_offset; 405 static int _ngroups_offset; 406 407 static void compute_offsets(); 408 409 public: 410 // parent ThreadGroup 411 static oop parent(oop java_thread_group); 412 // name 413 static typeArrayOop name(oop java_thread_group); 414 // ("name as oop" accessor is not necessary) 415 // Number of threads in group 416 static int nthreads(oop java_thread_group); 417 // threads 418 static objArrayOop threads(oop java_thread_group); 419 // Number of threads in group 420 static int ngroups(oop java_thread_group); 421 // groups 422 static objArrayOop groups(oop java_thread_group); 423 // maxPriority in group 424 static ThreadPriority maxPriority(oop java_thread_group); 425 // Destroyed 426 static bool is_destroyed(oop java_thread_group); 427 // Daemon 428 static bool is_daemon(oop java_thread_group); 429 // vmAllowSuspension 430 static bool is_vmAllowSuspension(oop java_thread_group); 431 // Debugging 432 friend class JavaClasses; 433}; 434 435 436 437// Interface to java.lang.Throwable objects 438 439class java_lang_Throwable: AllStatic { 440 friend class BacktraceBuilder; 441 442 private: 443 // Offsets 444 enum { 445 hc_backtrace_offset = 0, 446 hc_detailMessage_offset = 1, 447 hc_cause_offset = 2, // New since 1.4 448 hc_stackTrace_offset = 3 // New since 1.4 449 }; 450 enum { 451 hc_static_unassigned_stacktrace_offset = 0 // New since 1.7 452 }; 453 // Trace constants 454 enum { 455 trace_methods_offset = 0, 456 trace_bcis_offset = 1, 457 trace_mirrors_offset = 2, 458 trace_next_offset = 3, 459 trace_size = 4, 460 trace_chunk_size = 32 461 }; 462 463 static int backtrace_offset; 464 static int detailMessage_offset; 465 static int cause_offset; 466 static int stackTrace_offset; 467 static int static_unassigned_stacktrace_offset; 468 469 // Printing 470 static char* print_stack_element_to_buffer(Method* method, int bci); 471 static void print_to_stream(Handle stream, const char* str); 472 // StackTrace (programmatic access, new since 1.4) 473 static void clear_stacktrace(oop throwable); 474 // No stack trace available 475 static const char* no_stack_trace_message(); 476 // Stacktrace (post JDK 1.7.0 to allow immutability protocol to be followed) 477 static void set_stacktrace(oop throwable, oop st_element_array); 478 static oop unassigned_stacktrace(); 479 480 public: 481 // Backtrace 482 static oop backtrace(oop throwable); 483 static void set_backtrace(oop throwable, oop value); 484 // Needed by JVMTI to filter out this internal field. 485 static int get_backtrace_offset() { return backtrace_offset;} 486 static int get_detailMessage_offset() { return detailMessage_offset;} 487 // Message 488 static oop message(oop throwable); 489 static oop message(Handle throwable); 490 static void set_message(oop throwable, oop value); 491 // Print stack trace stored in exception by call-back to Java 492 // Note: this is no longer used in Merlin, but we still suppport 493 // it for compatibility. 494 static void print_stack_trace(oop throwable, oop print_stream); 495 static void print_stack_element(Handle stream, Method* method, int bci); 496 static void print_stack_element(outputStream *st, Method* method, int bci); 497 static void print_stack_usage(Handle stream); 498 499 // Allocate space for backtrace (created but stack trace not filled in) 500 static void allocate_backtrace(Handle throwable, TRAPS); 501 // Fill in current stack trace for throwable with preallocated backtrace (no GC) 502 static void fill_in_stack_trace_of_preallocated_backtrace(Handle throwable); 503 // Fill in current stack trace, can cause GC 504 static void fill_in_stack_trace(Handle throwable, methodHandle method, TRAPS); 505 static void fill_in_stack_trace(Handle throwable, methodHandle method = methodHandle()); 506 // Programmatic access to stack trace 507 static oop get_stack_trace_element(oop throwable, int index, TRAPS); 508 static int get_stack_trace_depth(oop throwable, TRAPS); 509 // Printing 510 static void print(oop throwable, outputStream* st); 511 static void print(Handle throwable, outputStream* st); 512 static void print_stack_trace(oop throwable, outputStream* st); 513 // Debugging 514 friend class JavaClasses; 515}; 516 517 518// Interface to java.lang.reflect.AccessibleObject objects 519 520class java_lang_reflect_AccessibleObject: AllStatic { 521 private: 522 // Note that to reduce dependencies on the JDK we compute these 523 // offsets at run-time. 524 static int override_offset; 525 526 static void compute_offsets(); 527 528 public: 529 // Accessors 530 static jboolean override(oop reflect); 531 static void set_override(oop reflect, jboolean value); 532 533 // Debugging 534 friend class JavaClasses; 535}; 536 537 538// Interface to java.lang.reflect.Method objects 539 540class java_lang_reflect_Method : public java_lang_reflect_AccessibleObject { 541 private: 542 // Note that to reduce dependencies on the JDK we compute these 543 // offsets at run-time. 544 static int clazz_offset; 545 static int name_offset; 546 static int returnType_offset; 547 static int parameterTypes_offset; 548 static int exceptionTypes_offset; 549 static int slot_offset; 550 static int modifiers_offset; 551 static int signature_offset; 552 static int annotations_offset; 553 static int parameter_annotations_offset; 554 static int annotation_default_offset; 555 556 static void compute_offsets(); 557 558 public: 559 // Allocation 560 static Handle create(TRAPS); 561 562 // Accessors 563 static oop clazz(oop reflect); 564 static void set_clazz(oop reflect, oop value); 565 566 static oop name(oop method); 567 static void set_name(oop method, oop value); 568 569 static oop return_type(oop method); 570 static void set_return_type(oop method, oop value); 571 572 static oop parameter_types(oop method); 573 static void set_parameter_types(oop method, oop value); 574 575 static oop exception_types(oop method); 576 static void set_exception_types(oop method, oop value); 577 578 static int slot(oop reflect); 579 static void set_slot(oop reflect, int value); 580 581 static int modifiers(oop method); 582 static void set_modifiers(oop method, int value); 583 584 static bool has_signature_field(); 585 static oop signature(oop method); 586 static void set_signature(oop method, oop value); 587 588 static bool has_annotations_field(); 589 static oop annotations(oop method); 590 static void set_annotations(oop method, oop value); 591 592 static bool has_parameter_annotations_field(); 593 static oop parameter_annotations(oop method); 594 static void set_parameter_annotations(oop method, oop value); 595 596 static bool has_annotation_default_field(); 597 static oop annotation_default(oop method); 598 static void set_annotation_default(oop method, oop value); 599 600 // Debugging 601 friend class JavaClasses; 602}; 603 604 605// Interface to java.lang.reflect.Constructor objects 606 607class java_lang_reflect_Constructor : public java_lang_reflect_AccessibleObject { 608 private: 609 // Note that to reduce dependencies on the JDK we compute these 610 // offsets at run-time. 611 static int clazz_offset; 612 static int parameterTypes_offset; 613 static int exceptionTypes_offset; 614 static int slot_offset; 615 static int modifiers_offset; 616 static int signature_offset; 617 static int annotations_offset; 618 static int parameter_annotations_offset; 619 620 static void compute_offsets(); 621 622 public: 623 // Allocation 624 static Handle create(TRAPS); 625 626 // Accessors 627 static oop clazz(oop reflect); 628 static void set_clazz(oop reflect, oop value); 629 630 static oop parameter_types(oop constructor); 631 static void set_parameter_types(oop constructor, oop value); 632 633 static oop exception_types(oop constructor); 634 static void set_exception_types(oop constructor, oop value); 635 636 static int slot(oop reflect); 637 static void set_slot(oop reflect, int value); 638 639 static int modifiers(oop constructor); 640 static void set_modifiers(oop constructor, int value); 641 642 static bool has_signature_field(); 643 static oop signature(oop constructor); 644 static void set_signature(oop constructor, oop value); 645 646 static bool has_annotations_field(); 647 static oop annotations(oop constructor); 648 static void set_annotations(oop constructor, oop value); 649 650 static bool has_parameter_annotations_field(); 651 static oop parameter_annotations(oop method); 652 static void set_parameter_annotations(oop method, oop value); 653 654 // Debugging 655 friend class JavaClasses; 656}; 657 658 659// Interface to java.lang.reflect.Field objects 660 661class java_lang_reflect_Field : public java_lang_reflect_AccessibleObject { 662 private: 663 // Note that to reduce dependencies on the JDK we compute these 664 // offsets at run-time. 665 static int clazz_offset; 666 static int name_offset; 667 static int type_offset; 668 static int slot_offset; 669 static int modifiers_offset; 670 static int signature_offset; 671 static int annotations_offset; 672 673 static void compute_offsets(); 674 675 public: 676 // Allocation 677 static Handle create(TRAPS); 678 679 // Accessors 680 static oop clazz(oop reflect); 681 static void set_clazz(oop reflect, oop value); 682 683 static oop name(oop field); 684 static void set_name(oop field, oop value); 685 686 static oop type(oop field); 687 static void set_type(oop field, oop value); 688 689 static int slot(oop reflect); 690 static void set_slot(oop reflect, int value); 691 692 static int modifiers(oop field); 693 static void set_modifiers(oop field, int value); 694 695 static bool has_signature_field(); 696 static oop signature(oop constructor); 697 static void set_signature(oop constructor, oop value); 698 699 static bool has_annotations_field(); 700 static oop annotations(oop constructor); 701 static void set_annotations(oop constructor, oop value); 702 703 static bool has_parameter_annotations_field(); 704 static oop parameter_annotations(oop method); 705 static void set_parameter_annotations(oop method, oop value); 706 707 static bool has_annotation_default_field(); 708 static oop annotation_default(oop method); 709 static void set_annotation_default(oop method, oop value); 710 711 // Debugging 712 friend class JavaClasses; 713}; 714 715// Interface to sun.reflect.ConstantPool objects 716class sun_reflect_ConstantPool { 717 private: 718 // Note that to reduce dependencies on the JDK we compute these 719 // offsets at run-time. 720 static int _oop_offset; 721 722 static void compute_offsets(); 723 724 public: 725 // Allocation 726 static Handle create(TRAPS); 727 728 // Accessors 729 static void set_cp(oop reflect, ConstantPool* value); 730 static int oop_offset() { 731 return _oop_offset; 732 } 733 734 static ConstantPool* get_cp(oop reflect); 735 736 // Debugging 737 friend class JavaClasses; 738}; 739 740// Interface to sun.reflect.UnsafeStaticFieldAccessorImpl objects 741class sun_reflect_UnsafeStaticFieldAccessorImpl { 742 private: 743 static int _base_offset; 744 static void compute_offsets(); 745 746 public: 747 static int base_offset() { 748 return _base_offset; 749 } 750 751 // Debugging 752 friend class JavaClasses; 753}; 754 755// Interface to java.lang primitive type boxing objects: 756// - java.lang.Boolean 757// - java.lang.Character 758// - java.lang.Float 759// - java.lang.Double 760// - java.lang.Byte 761// - java.lang.Short 762// - java.lang.Integer 763// - java.lang.Long 764 765// This could be separated out into 8 individual classes. 766 767class java_lang_boxing_object: AllStatic { 768 private: 769 enum { 770 hc_value_offset = 0 771 }; 772 static int value_offset; 773 static int long_value_offset; 774 775 static oop initialize_and_allocate(BasicType type, TRAPS); 776 public: 777 // Allocation. Returns a boxed value, or NULL for invalid type. 778 static oop create(BasicType type, jvalue* value, TRAPS); 779 // Accessors. Returns the basic type being boxed, or T_ILLEGAL for invalid oop. 780 static BasicType get_value(oop box, jvalue* value); 781 static BasicType set_value(oop box, jvalue* value); 782 static BasicType basic_type(oop box); 783 static bool is_instance(oop box) { return basic_type(box) != T_ILLEGAL; } 784 static bool is_instance(oop box, BasicType type) { return basic_type(box) == type; } 785 static void print(oop box, outputStream* st) { jvalue value; print(get_value(box, &value), &value, st); } 786 static void print(BasicType type, jvalue* value, outputStream* st); 787 788 static int value_offset_in_bytes(BasicType type) { 789 return ( type == T_LONG || type == T_DOUBLE ) ? long_value_offset : 790 value_offset; 791 } 792 793 // Debugging 794 friend class JavaClasses; 795}; 796 797 798 799// Interface to java.lang.ref.Reference objects 800 801class java_lang_ref_Reference: AllStatic { 802 public: 803 enum { 804 hc_referent_offset = 0, 805 hc_queue_offset = 1, 806 hc_next_offset = 2, 807 hc_discovered_offset = 3 // Is not last, see SoftRefs. 808 }; 809 enum { 810 hc_static_lock_offset = 0, 811 hc_static_pending_offset = 1 812 }; 813 814 static int referent_offset; 815 static int queue_offset; 816 static int next_offset; 817 static int discovered_offset; 818 static int static_lock_offset; 819 static int static_pending_offset; 820 static int number_of_fake_oop_fields; 821 822 // Accessors 823 static oop referent(oop ref) { 824 return ref->obj_field(referent_offset); 825 } 826 static void set_referent(oop ref, oop value) { 827 ref->obj_field_put(referent_offset, value); 828 } 829 static void set_referent_raw(oop ref, oop value) { 830 ref->obj_field_put_raw(referent_offset, value); 831 } 832 static HeapWord* referent_addr(oop ref) { 833 return ref->obj_field_addr<HeapWord>(referent_offset); 834 } 835 static oop next(oop ref) { 836 return ref->obj_field(next_offset); 837 } 838 static void set_next(oop ref, oop value) { 839 ref->obj_field_put(next_offset, value); 840 } 841 static void set_next_raw(oop ref, oop value) { 842 ref->obj_field_put_raw(next_offset, value); 843 } 844 static HeapWord* next_addr(oop ref) { 845 return ref->obj_field_addr<HeapWord>(next_offset); 846 } 847 static oop discovered(oop ref) { 848 return ref->obj_field(discovered_offset); 849 } 850 static void set_discovered(oop ref, oop value) { 851 ref->obj_field_put(discovered_offset, value); 852 } 853 static void set_discovered_raw(oop ref, oop value) { 854 ref->obj_field_put_raw(discovered_offset, value); 855 } 856 static HeapWord* discovered_addr(oop ref) { 857 return ref->obj_field_addr<HeapWord>(discovered_offset); 858 } 859 // Accessors for statics 860 static oop pending_list_lock(); 861 static oop pending_list(); 862 863 static HeapWord* pending_list_lock_addr(); 864 static HeapWord* pending_list_addr(); 865}; 866 867 868// Interface to java.lang.ref.SoftReference objects 869 870class java_lang_ref_SoftReference: public java_lang_ref_Reference { 871 public: 872 enum { 873 // The timestamp is a long field and may need to be adjusted for alignment. 874 hc_timestamp_offset = hc_discovered_offset + 1 875 }; 876 enum { 877 hc_static_clock_offset = 0 878 }; 879 880 static int timestamp_offset; 881 static int static_clock_offset; 882 883 // Accessors 884 static jlong timestamp(oop ref); 885 886 // Accessors for statics 887 static jlong clock(); 888 static void set_clock(jlong value); 889}; 890 891 892// Interface to java.lang.invoke.MethodHandle objects 893 894class MethodHandleEntry; 895 896class java_lang_invoke_MethodHandle: AllStatic { 897 friend class JavaClasses; 898 899 private: 900 static int _type_offset; // the MethodType of this MH 901 static int _form_offset; // the LambdaForm of this MH 902 903 static void compute_offsets(); 904 905 public: 906 // Accessors 907 static oop type(oop mh); 908 static void set_type(oop mh, oop mtype); 909 910 static oop form(oop mh); 911 static void set_form(oop mh, oop lform); 912 913 // Testers 914 static bool is_subclass(Klass* klass) { 915 return Klass::cast(klass)->is_subclass_of(SystemDictionary::MethodHandle_klass()); 916 } 917 static bool is_instance(oop obj) { 918 return obj != NULL && is_subclass(obj->klass()); 919 } 920 921 // Accessors for code generation: 922 static int type_offset_in_bytes() { return _type_offset; } 923 static int form_offset_in_bytes() { return _form_offset; } 924}; 925 926// Interface to java.lang.invoke.LambdaForm objects 927// (These are a private interface for managing adapter code generation.) 928 929class java_lang_invoke_LambdaForm: AllStatic { 930 friend class JavaClasses; 931 932 private: 933 static int _vmentry_offset; // type is MemberName 934 935 static void compute_offsets(); 936 937 public: 938 // Accessors 939 static oop vmentry(oop lform); 940 static void set_vmentry(oop lform, oop invoker); 941 942 // Testers 943 static bool is_subclass(Klass* klass) { 944 return SystemDictionary::LambdaForm_klass() != NULL && 945 Klass::cast(klass)->is_subclass_of(SystemDictionary::LambdaForm_klass()); 946 } 947 static bool is_instance(oop obj) { 948 return obj != NULL && is_subclass(obj->klass()); 949 } 950 951 // Accessors for code generation: 952 static int vmentry_offset_in_bytes() { return _vmentry_offset; } 953}; 954 955 956// Interface to java.lang.invoke.MemberName objects 957// (These are a private interface for Java code to query the class hierarchy.) 958 959#define MEMBERNAME_INJECTED_FIELDS(macro) \ 960 macro(java_lang_invoke_MemberName, vmloader, object_signature, false) \ 961 macro(java_lang_invoke_MemberName, vmindex, intptr_signature, false) \ 962 macro(java_lang_invoke_MemberName, vmtarget, intptr_signature, false) 963 964class java_lang_invoke_MemberName: AllStatic { 965 friend class JavaClasses; 966 967 private: 968 // From java.lang.invoke.MemberName: 969 // private Class<?> clazz; // class in which the method is defined 970 // private String name; // may be null if not yet materialized 971 // private Object type; // may be null if not yet materialized 972 // private int flags; // modifier bits; see reflect.Modifier 973 // private intptr vmtarget; // VM-specific target value 974 // private intptr_t vmindex; // member index within class or interface 975 static int _clazz_offset; 976 static int _name_offset; 977 static int _type_offset; 978 static int _flags_offset; 979 static int _vmtarget_offset; 980 static int _vmloader_offset; 981 static int _vmindex_offset; 982 983 static void compute_offsets(); 984 985 public: 986 // Accessors 987 static oop clazz(oop mname); 988 static void set_clazz(oop mname, oop clazz); 989 990 static oop type(oop mname); 991 static void set_type(oop mname, oop type); 992 993 static oop name(oop mname); 994 static void set_name(oop mname, oop name); 995 996 static int flags(oop mname); 997 static void set_flags(oop mname, int flags); 998 999 static Metadata* vmtarget(oop mname); 1000 static void set_vmtarget(oop mname, Metadata* target); 1001 1002 static intptr_t vmindex(oop mname); 1003 static void set_vmindex(oop mname, intptr_t index); 1004 1005 // Testers 1006 static bool is_subclass(Klass* klass) { 1007 return Klass::cast(klass)->is_subclass_of(SystemDictionary::MemberName_klass()); 1008 } 1009 static bool is_instance(oop obj) { 1010 return obj != NULL && is_subclass(obj->klass()); 1011 } 1012 1013 // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants): 1014 enum { 1015 MN_IS_METHOD = 0x00010000, // method (not constructor) 1016 MN_IS_CONSTRUCTOR = 0x00020000, // constructor 1017 MN_IS_FIELD = 0x00040000, // field 1018 MN_IS_TYPE = 0x00080000, // nested type 1019 MN_REFERENCE_KIND_SHIFT = 24, // refKind 1020 MN_REFERENCE_KIND_MASK = 0x0F000000 >> MN_REFERENCE_KIND_SHIFT, 1021 // The SEARCH_* bits are not for MN.flags but for the matchFlags argument of MHN.getMembers: 1022 MN_SEARCH_SUPERCLASSES = 0x00100000, // walk super classes 1023 MN_SEARCH_INTERFACES = 0x00200000 // walk implemented interfaces 1024 }; 1025 1026 // Accessors for code generation: 1027 static int clazz_offset_in_bytes() { return _clazz_offset; } 1028 static int type_offset_in_bytes() { return _type_offset; } 1029 static int name_offset_in_bytes() { return _name_offset; } 1030 static int flags_offset_in_bytes() { return _flags_offset; } 1031 static int vmtarget_offset_in_bytes() { return _vmtarget_offset; } 1032 static int vmindex_offset_in_bytes() { return _vmindex_offset; } 1033}; 1034 1035 1036// Interface to java.lang.invoke.MethodType objects 1037 1038class java_lang_invoke_MethodType: AllStatic { 1039 friend class JavaClasses; 1040 1041 private: 1042 static int _rtype_offset; 1043 static int _ptypes_offset; 1044 1045 static void compute_offsets(); 1046 1047 public: 1048 // Accessors 1049 static oop rtype(oop mt); 1050 static objArrayOop ptypes(oop mt); 1051 1052 static oop ptype(oop mt, int index); 1053 static int ptype_count(oop mt); 1054 1055 static int ptype_slot_count(oop mt); // extra counts for long/double 1056 static int rtype_slot_count(oop mt); // extra counts for long/double 1057 1058 static Symbol* as_signature(oop mt, bool intern_if_not_found, TRAPS); 1059 static void print_signature(oop mt, outputStream* st); 1060 1061 static bool is_instance(oop obj) { 1062 return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass(); 1063 } 1064 1065 static bool equals(oop mt1, oop mt2); 1066 1067 // Accessors for code generation: 1068 static int rtype_offset_in_bytes() { return _rtype_offset; } 1069 static int ptypes_offset_in_bytes() { return _ptypes_offset; } 1070}; 1071 1072 1073// Interface to java.lang.invoke.CallSite objects 1074 1075class java_lang_invoke_CallSite: AllStatic { 1076 friend class JavaClasses; 1077 1078private: 1079 static int _target_offset; 1080 1081 static void compute_offsets(); 1082 1083public: 1084 // Accessors 1085 static oop target( oop site) { return site->obj_field( _target_offset); } 1086 static void set_target( oop site, oop target) { site->obj_field_put( _target_offset, target); } 1087 1088 static volatile oop target_volatile(oop site) { return site->obj_field_volatile( _target_offset); } 1089 static void set_target_volatile(oop site, oop target) { site->obj_field_put_volatile(_target_offset, target); } 1090 1091 // Testers 1092 static bool is_subclass(Klass* klass) { 1093 return Klass::cast(klass)->is_subclass_of(SystemDictionary::CallSite_klass()); 1094 } 1095 static bool is_instance(oop obj) { 1096 return obj != NULL && is_subclass(obj->klass()); 1097 } 1098 1099 // Accessors for code generation: 1100 static int target_offset_in_bytes() { return _target_offset; } 1101}; 1102 1103 1104// Interface to java.security.AccessControlContext objects 1105 1106class java_security_AccessControlContext: AllStatic { 1107 private: 1108 // Note that for this class the layout changed between JDK1.2 and JDK1.3, 1109 // so we compute the offsets at startup rather than hard-wiring them. 1110 static int _context_offset; 1111 static int _privilegedContext_offset; 1112 static int _isPrivileged_offset; 1113 1114 static void compute_offsets(); 1115 public: 1116 static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS); 1117 1118 // Debugging/initialization 1119 friend class JavaClasses; 1120}; 1121 1122 1123// Interface to java.lang.ClassLoader objects 1124 1125#define CLASSLOADER_INJECTED_FIELDS(macro) \ 1126 macro(java_lang_ClassLoader, loader_data, intptr_signature, false) \ 1127 macro(java_lang_ClassLoader, dependencies, object_signature, false) 1128 1129class java_lang_ClassLoader : AllStatic { 1130 private: 1131 // The fake offsets are added by the class loader when java.lang.Class is loaded 1132 enum { 1133 hc_parent_offset = 0 1134 }; 1135 static int _loader_data_offset; 1136 static int _dependencies_offset; 1137 static bool offsets_computed; 1138 static int parent_offset; 1139 static int parallelCapable_offset; 1140 1141 public: 1142 static void compute_offsets(); 1143 1144 static ClassLoaderData** loader_data_addr(oop loader); 1145 static ClassLoaderData* loader_data(oop loader); 1146 1147 static oop dependencies(oop loader); 1148 static HeapWord* dependencies_addr(oop loader); 1149 1150 static oop parent(oop loader); 1151 static bool isAncestor(oop loader, oop cl); 1152 1153 // Support for parallelCapable field 1154 static bool parallelCapable(oop the_class_mirror); 1155 1156 static bool is_trusted_loader(oop loader); 1157 1158 // Fix for 4474172 1159 static oop non_reflection_class_loader(oop loader); 1160 1161 // Testers 1162 static bool is_subclass(Klass* klass) { 1163 return Klass::cast(klass)->is_subclass_of(SystemDictionary::ClassLoader_klass()); 1164 } 1165 static bool is_instance(oop obj) { 1166 return obj != NULL && is_subclass(obj->klass()); 1167 } 1168 1169 // Debugging 1170 friend class JavaClasses; 1171 friend class ClassFileParser; // access to number_of_fake_fields 1172}; 1173 1174 1175// Interface to java.lang.System objects 1176 1177class java_lang_System : AllStatic { 1178 private: 1179 enum { 1180 hc_static_in_offset = 0, 1181 hc_static_out_offset = 1, 1182 hc_static_err_offset = 2 1183 }; 1184 1185 static int static_in_offset; 1186 static int static_out_offset; 1187 static int static_err_offset; 1188 1189 public: 1190 static int in_offset_in_bytes(); 1191 static int out_offset_in_bytes(); 1192 static int err_offset_in_bytes(); 1193 1194 // Debugging 1195 friend class JavaClasses; 1196}; 1197 1198 1199// Interface to java.lang.StackTraceElement objects 1200 1201class java_lang_StackTraceElement: AllStatic { 1202 private: 1203 enum { 1204 hc_declaringClass_offset = 0, 1205 hc_methodName_offset = 1, 1206 hc_fileName_offset = 2, 1207 hc_lineNumber_offset = 3 1208 }; 1209 1210 static int declaringClass_offset; 1211 static int methodName_offset; 1212 static int fileName_offset; 1213 static int lineNumber_offset; 1214 1215 public: 1216 // Setters 1217 static void set_declaringClass(oop element, oop value); 1218 static void set_methodName(oop element, oop value); 1219 static void set_fileName(oop element, oop value); 1220 static void set_lineNumber(oop element, int value); 1221 1222 // Create an instance of StackTraceElement 1223 static oop create(methodHandle m, int bci, TRAPS); 1224 1225 // Debugging 1226 friend class JavaClasses; 1227}; 1228 1229 1230// Interface to java.lang.AssertionStatusDirectives objects 1231 1232class java_lang_AssertionStatusDirectives: AllStatic { 1233 private: 1234 enum { 1235 hc_classes_offset, 1236 hc_classEnabled_offset, 1237 hc_packages_offset, 1238 hc_packageEnabled_offset, 1239 hc_deflt_offset 1240 }; 1241 1242 static int classes_offset; 1243 static int classEnabled_offset; 1244 static int packages_offset; 1245 static int packageEnabled_offset; 1246 static int deflt_offset; 1247 1248 public: 1249 // Setters 1250 static void set_classes(oop obj, oop val); 1251 static void set_classEnabled(oop obj, oop val); 1252 static void set_packages(oop obj, oop val); 1253 static void set_packageEnabled(oop obj, oop val); 1254 static void set_deflt(oop obj, bool val); 1255 // Debugging 1256 friend class JavaClasses; 1257}; 1258 1259 1260class java_nio_Buffer: AllStatic { 1261 private: 1262 static int _limit_offset; 1263 1264 public: 1265 static int limit_offset(); 1266 static void compute_offsets(); 1267}; 1268 1269class java_util_concurrent_locks_AbstractOwnableSynchronizer : AllStatic { 1270 private: 1271 static int _owner_offset; 1272 public: 1273 static void initialize(TRAPS); 1274 static oop get_owner_threadObj(oop obj); 1275}; 1276 1277// Use to declare fields that need to be injected into Java classes 1278// for the JVM to use. The name_index and signature_index are 1279// declared in vmSymbols. The may_be_java flag is used to declare 1280// fields that might already exist in Java but should be injected if 1281// they don't. Otherwise the field is unconditionally injected and 1282// the JVM uses the injected one. This is to ensure that name 1283// collisions don't occur. In general may_be_java should be false 1284// unless there's a good reason. 1285 1286class InjectedField { 1287 public: 1288 const SystemDictionary::WKID klass_id; 1289 const vmSymbols::SID name_index; 1290 const vmSymbols::SID signature_index; 1291 const bool may_be_java; 1292 1293 1294 Klass* klass() const { return SystemDictionary::well_known_klass(klass_id); } 1295 Symbol* name() const { return lookup_symbol(name_index); } 1296 Symbol* signature() const { return lookup_symbol(signature_index); } 1297 1298 int compute_offset(); 1299 1300 // Find the Symbol for this index 1301 static Symbol* lookup_symbol(int symbol_index) { 1302 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); 1303 } 1304}; 1305 1306#define DECLARE_INJECTED_FIELD_ENUM(klass, name, signature, may_be_java) \ 1307 klass##_##name##_enum, 1308 1309#define ALL_INJECTED_FIELDS(macro) \ 1310 CLASS_INJECTED_FIELDS(macro) \ 1311 CLASSLOADER_INJECTED_FIELDS(macro) \ 1312 MEMBERNAME_INJECTED_FIELDS(macro) 1313 1314// Interface to hard-coded offset checking 1315 1316class JavaClasses : AllStatic { 1317 private: 1318 1319 static InjectedField _injected_fields[]; 1320 1321 static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1322 static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1323 static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1324 1325 public: 1326 enum InjectedFieldID { 1327 ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM) 1328 MAX_enum 1329 }; 1330 1331 static int compute_injected_offset(InjectedFieldID id); 1332 1333 static void compute_hard_coded_offsets(); 1334 static void compute_offsets(); 1335 static void check_offsets() PRODUCT_RETURN; 1336 1337 static InjectedField* get_injected(Symbol* class_name, int* field_count); 1338}; 1339 1340#undef DECLARE_INJECTED_FIELD_ENUM 1341 1342#endif // SHARE_VM_CLASSFILE_JAVACLASSES_HPP 1343