1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_CLASSFILE_JAVACLASSES_HPP 26 #define SHARE_VM_CLASSFILE_JAVACLASSES_HPP 27 28 #include "classfile/systemDictionary.hpp" 29 #include "jvmtifiles/jvmti.h" 30 #include "oops/oop.hpp" 31 #include "runtime/os.hpp" 32 #include "utilities/utf8.hpp" 33 34 // Interface for manipulating the basic Java classes. 35 // 36 // All dependencies on layout of actual Java classes should be kept here. 37 // If the layout of any of the classes above changes the offsets must be adjusted. 38 // 39 // For most classes we hardwire the offsets for performance reasons. In certain 40 // cases (e.g. java.security.AccessControlContext) we compute the offsets at 41 // startup since the layout here differs between JDK1.2 and JDK1.3. 42 // 43 // Note that fields (static and non-static) are arranged with oops before non-oops 44 // on a per class basis. The offsets below have to reflect this ordering. 45 // 46 // When editing the layouts please update the check_offset verification code 47 // correspondingly. The names in the enums must be identical to the actual field 48 // names in order for the verification code to work. 49 50 51 // Interface to java.lang.String objects 52 53 class java_lang_String : AllStatic { 54 private: 55 static int value_offset; 56 static int offset_offset; 57 static int count_offset; 58 static int hash_offset; 59 60 static bool initialized; 61 62 static Handle basic_create(int length, bool tenured, TRAPS); 63 static Handle basic_create_from_unicode(jchar* unicode, int length, bool tenured, TRAPS); 64 65 static void set_value( oop string, typeArrayOop buffer) { 66 assert(initialized, "Must be initialized"); 67 string->obj_field_put(value_offset, (oop)buffer); 68 } 69 static void set_offset(oop string, int offset) { 70 assert(initialized, "Must be initialized"); 71 if (offset_offset > 0) { 72 string->int_field_put(offset_offset, offset); 73 } 74 } 75 static void set_count( oop string, int count) { 76 assert(initialized, "Must be initialized"); 77 if (count_offset > 0) { 78 string->int_field_put(count_offset, count); 79 } 80 } 81 82 public: 83 static void compute_offsets(); 84 85 // Instance creation 86 static Handle create_from_unicode(jchar* unicode, int len, TRAPS); 87 static Handle create_tenured_from_unicode(jchar* unicode, int len, TRAPS); 88 static oop create_oop_from_unicode(jchar* unicode, int len, TRAPS); 89 static Handle create_from_str(const char* utf8_str, TRAPS); 90 static oop create_oop_from_str(const char* utf8_str, TRAPS); 91 static Handle create_from_symbol(Symbol* symbol, TRAPS); 92 static Handle create_from_platform_dependent_str(const char* str, TRAPS); 93 static Handle char_converter(Handle java_string, jchar from_char, jchar to_char, TRAPS); 94 95 static bool has_offset_field() { 96 assert(initialized, "Must be initialized"); 97 return (offset_offset > 0); 98 } 99 100 static bool has_count_field() { 101 assert(initialized, "Must be initialized"); 102 return (count_offset > 0); 103 } 104 105 static bool has_hash_field() { 106 assert(initialized, "Must be initialized"); 107 return (hash_offset > 0); 108 } 109 110 static int value_offset_in_bytes() { 111 assert(initialized && (value_offset > 0), "Must be initialized"); 112 return value_offset; 113 } 114 static int count_offset_in_bytes() { 115 assert(initialized && (count_offset > 0), "Must be initialized"); 116 return count_offset; 117 } 118 static int offset_offset_in_bytes() { 119 assert(initialized && (offset_offset > 0), "Must be initialized"); 120 return offset_offset; 121 } 122 static int hash_offset_in_bytes() { 123 assert(initialized && (hash_offset > 0), "Must be initialized"); 124 return hash_offset; 125 } 126 127 // Accessors 128 static typeArrayOop value(oop java_string) { 129 assert(initialized && (value_offset > 0), "Must be initialized"); 130 assert(is_instance(java_string), "must be java_string"); 131 return (typeArrayOop) java_string->obj_field(value_offset); 132 } 133 static int offset(oop java_string) { 134 assert(initialized, "Must be initialized"); 135 assert(is_instance(java_string), "must be java_string"); 136 if (offset_offset > 0) { 137 return java_string->int_field(offset_offset); 138 } else { 139 return 0; 140 } 141 } 142 static int length(oop java_string) { 143 assert(initialized, "Must be initialized"); 144 assert(is_instance(java_string), "must be java_string"); 145 if (count_offset > 0) { 146 return java_string->int_field(count_offset); 147 } else { 148 return ((typeArrayOop)java_string->obj_field(value_offset))->length(); 149 } 150 } 151 static int utf8_length(oop java_string); 152 153 // String converters 154 static char* as_utf8_string(oop java_string); 155 static char* as_utf8_string(oop java_string, char* buf, int buflen); 156 static char* as_utf8_string(oop java_string, int start, int len); 157 static char* as_platform_dependent_str(Handle java_string, TRAPS); 158 static jchar* as_unicode_string(oop java_string, int& length); 159 160 // Compute the hash value for a java.lang.String object which would 161 // contain the characters passed in. 162 // 163 // As the hash value used by the String object itself, in 164 // String.hashCode(). This value is normally calculated in Java code 165 // in the String.hashCode method(), but is precomputed for String 166 // objects in the shared archive file. 167 // hash P(31) from Kernighan & Ritchie 168 // 169 // For this reason, THIS ALGORITHM MUST MATCH String.toHash(). 170 template <typename T> static unsigned int to_hash(T* s, int len) { 171 unsigned int h = 0; 172 while (len-- > 0) { 173 h = 31*h + (unsigned int) *s; 174 s++; 175 } 176 return h; 177 } 178 static unsigned int to_hash(oop java_string); 179 180 // This is the string hash code used by the StringTable, which may be 181 // the same as String.toHash or an alternate hash code. 182 static unsigned int hash_string(oop java_string); 183 184 static bool equals(oop java_string, jchar* chars, int len); 185 186 // Conversion between '.' and '/' formats 187 static Handle externalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '/', '.', THREAD); } 188 static Handle internalize_classname(Handle java_string, TRAPS) { return char_converter(java_string, '.', '/', THREAD); } 189 190 // Conversion 191 static Symbol* as_symbol(Handle java_string, TRAPS); 192 static Symbol* as_symbol_or_null(oop java_string); 193 194 // Testers 195 static bool is_instance(oop obj) { 196 return obj != NULL && obj->klass() == SystemDictionary::String_klass(); 197 } 198 199 // Debugging 200 static void print(Handle java_string, outputStream* st); 201 friend class JavaClasses; 202 }; 203 204 205 // Interface to java.lang.Class objects 206 207 #define CLASS_INJECTED_FIELDS(macro) \ 208 macro(java_lang_Class, klass, object_signature, false) \ 209 macro(java_lang_Class, resolved_constructor, object_signature, false) \ 210 macro(java_lang_Class, array_klass, object_signature, false) \ 211 macro(java_lang_Class, oop_size, int_signature, false) \ 212 macro(java_lang_Class, static_oop_field_count, int_signature, false) 213 214 class java_lang_Class : AllStatic { 215 friend class VMStructs; 216 217 private: 218 // The fake offsets are added by the class loader when java.lang.Class is loaded 219 220 static int _klass_offset; 221 static int _resolved_constructor_offset; 222 static int _array_klass_offset; 223 224 static int _oop_size_offset; 225 static int _static_oop_field_count_offset; 226 227 static int _class_loader_offset; 228 229 static bool offsets_computed; 230 static int classRedefinedCount_offset; 231 232 static void set_class_loader(oop java_class, oop class_loader); 233 public: 234 static void compute_offsets(); 235 236 // Instance creation 237 static oop create_mirror(KlassHandle k, Handle class_loader, TRAPS); 238 static oop create_mirror(KlassHandle k, TRAPS) { 239 return create_mirror(k, Handle(), THREAD); 240 } 241 242 static void fixup_mirror(KlassHandle k, TRAPS); 243 static oop create_basic_type_mirror(const char* basic_type_name, BasicType type, TRAPS); 244 // Conversion 245 static klassOop as_klassOop(oop java_class); 246 static void set_klass(oop java_class, klassOop klass); 247 static BasicType as_BasicType(oop java_class, klassOop* reference_klass = NULL); 248 static BasicType as_BasicType(oop java_class, KlassHandle* reference_klass) { 249 klassOop refk_oop = NULL; 250 BasicType result = as_BasicType(java_class, &refk_oop); 251 (*reference_klass) = KlassHandle(refk_oop); 252 return result; 253 } 254 static Symbol* as_signature(oop java_class, bool intern_if_not_found, TRAPS); 255 static void print_signature(oop java_class, outputStream *st); 256 // Testing 257 static bool is_instance(oop obj) { 258 return obj != NULL && obj->klass() == SystemDictionary::Class_klass(); 259 } 260 static bool is_primitive(oop java_class); 261 static BasicType primitive_type(oop java_class); 262 static oop primitive_mirror(BasicType t); 263 // JVM_NewInstance support 264 static methodOop resolved_constructor(oop java_class); 265 static void set_resolved_constructor(oop java_class, methodOop constructor); 266 // JVM_NewArray support 267 static klassOop array_klass(oop java_class); 268 static void set_array_klass(oop java_class, klassOop klass); 269 // compiler support for class operations 270 static int klass_offset_in_bytes() { return _klass_offset; } 271 static int resolved_constructor_offset_in_bytes() { return _resolved_constructor_offset; } 272 static int array_klass_offset_in_bytes() { return _array_klass_offset; } 273 // Support for classRedefinedCount field 274 static int classRedefinedCount(oop the_class_mirror); 275 static void set_classRedefinedCount(oop the_class_mirror, int value); 276 277 static oop class_loader(oop java_class); 278 279 static int oop_size(oop java_class); 280 static void set_oop_size(oop java_class, int size); 281 static int static_oop_field_count(oop java_class); 282 static void set_static_oop_field_count(oop java_class, int size); 283 284 // Debugging 285 friend class JavaClasses; 286 friend class instanceKlass; // verification code accesses offsets 287 friend class ClassFileParser; // access to number_of_fake_fields 288 }; 289 290 // Interface to java.lang.Thread objects 291 292 class java_lang_Thread : AllStatic { 293 private: 294 // Note that for this class the layout changed between JDK1.2 and JDK1.3, 295 // so we compute the offsets at startup rather than hard-wiring them. 296 static int _name_offset; 297 static int _group_offset; 298 static int _contextClassLoader_offset; 299 static int _inheritedAccessControlContext_offset; 300 static int _priority_offset; 301 static int _eetop_offset; 302 static int _daemon_offset; 303 static int _stillborn_offset; 304 static int _stackSize_offset; 305 static int _tid_offset; 306 static int _thread_status_offset; 307 static int _park_blocker_offset; 308 static int _park_event_offset ; 309 310 static void compute_offsets(); 311 312 public: 313 // Instance creation 314 static oop create(); 315 // Returns the JavaThread associated with the thread obj 316 static JavaThread* thread(oop java_thread); 317 // Set JavaThread for instance 318 static void set_thread(oop java_thread, JavaThread* thread); 319 // Name 320 static typeArrayOop name(oop java_thread); 321 static void set_name(oop java_thread, typeArrayOop name); 322 // Priority 323 static ThreadPriority priority(oop java_thread); 324 static void set_priority(oop java_thread, ThreadPriority priority); 325 // Thread group 326 static oop threadGroup(oop java_thread); 327 // Stillborn 328 static bool is_stillborn(oop java_thread); 329 static void set_stillborn(oop java_thread); 330 // Alive (NOTE: this is not really a field, but provides the correct 331 // definition without doing a Java call) 332 static bool is_alive(oop java_thread); 333 // Daemon 334 static bool is_daemon(oop java_thread); 335 static void set_daemon(oop java_thread); 336 // Context ClassLoader 337 static oop context_class_loader(oop java_thread); 338 // Control context 339 static oop inherited_access_control_context(oop java_thread); 340 // Stack size hint 341 static jlong stackSize(oop java_thread); 342 // Thread ID 343 static jlong thread_id(oop java_thread); 344 345 // Blocker object responsible for thread parking 346 static oop park_blocker(oop java_thread); 347 348 // Pointer to type-stable park handler, encoded as jlong. 349 // Should be set when apparently null 350 // For details, see unsafe.cpp Unsafe_Unpark 351 static jlong park_event(oop java_thread); 352 static bool set_park_event(oop java_thread, jlong ptr); 353 354 // Java Thread Status for JVMTI and M&M use. 355 // This thread status info is saved in threadStatus field of 356 // java.lang.Thread java class. 357 enum ThreadStatus { 358 NEW = 0, 359 RUNNABLE = JVMTI_THREAD_STATE_ALIVE + // runnable / running 360 JVMTI_THREAD_STATE_RUNNABLE, 361 SLEEPING = JVMTI_THREAD_STATE_ALIVE + // Thread.sleep() 362 JVMTI_THREAD_STATE_WAITING + 363 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 364 JVMTI_THREAD_STATE_SLEEPING, 365 IN_OBJECT_WAIT = JVMTI_THREAD_STATE_ALIVE + // Object.wait() 366 JVMTI_THREAD_STATE_WAITING + 367 JVMTI_THREAD_STATE_WAITING_INDEFINITELY + 368 JVMTI_THREAD_STATE_IN_OBJECT_WAIT, 369 IN_OBJECT_WAIT_TIMED = JVMTI_THREAD_STATE_ALIVE + // Object.wait(long) 370 JVMTI_THREAD_STATE_WAITING + 371 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 372 JVMTI_THREAD_STATE_IN_OBJECT_WAIT, 373 PARKED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park() 374 JVMTI_THREAD_STATE_WAITING + 375 JVMTI_THREAD_STATE_WAITING_INDEFINITELY + 376 JVMTI_THREAD_STATE_PARKED, 377 PARKED_TIMED = JVMTI_THREAD_STATE_ALIVE + // LockSupport.park(long) 378 JVMTI_THREAD_STATE_WAITING + 379 JVMTI_THREAD_STATE_WAITING_WITH_TIMEOUT + 380 JVMTI_THREAD_STATE_PARKED, 381 BLOCKED_ON_MONITOR_ENTER = JVMTI_THREAD_STATE_ALIVE + // (re-)entering a synchronization block 382 JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER, 383 TERMINATED = JVMTI_THREAD_STATE_TERMINATED 384 }; 385 // Write thread status info to threadStatus field of java.lang.Thread. 386 static void set_thread_status(oop java_thread_oop, ThreadStatus status); 387 // Read thread status info from threadStatus field of java.lang.Thread. 388 static ThreadStatus get_thread_status(oop java_thread_oop); 389 390 static const char* thread_status_name(oop java_thread_oop); 391 392 // Debugging 393 friend class JavaClasses; 394 }; 395 396 // Interface to java.lang.ThreadGroup objects 397 398 class java_lang_ThreadGroup : AllStatic { 399 private: 400 static int _parent_offset; 401 static int _name_offset; 402 static int _threads_offset; 403 static int _groups_offset; 404 static int _maxPriority_offset; 405 static int _destroyed_offset; 406 static int _daemon_offset; 407 static int _vmAllowSuspension_offset; 408 static int _nthreads_offset; 409 static int _ngroups_offset; 410 411 static void compute_offsets(); 412 413 public: 414 // parent ThreadGroup 415 static oop parent(oop java_thread_group); 416 // name 417 static typeArrayOop name(oop java_thread_group); 418 // ("name as oop" accessor is not necessary) 419 // Number of threads in group 420 static int nthreads(oop java_thread_group); 421 // threads 422 static objArrayOop threads(oop java_thread_group); 423 // Number of threads in group 424 static int ngroups(oop java_thread_group); 425 // groups 426 static objArrayOop groups(oop java_thread_group); 427 // maxPriority in group 428 static ThreadPriority maxPriority(oop java_thread_group); 429 // Destroyed 430 static bool is_destroyed(oop java_thread_group); 431 // Daemon 432 static bool is_daemon(oop java_thread_group); 433 // vmAllowSuspension 434 static bool is_vmAllowSuspension(oop java_thread_group); 435 // Debugging 436 friend class JavaClasses; 437 }; 438 439 440 441 // Interface to java.lang.Throwable objects 442 443 class java_lang_Throwable: AllStatic { 444 friend class BacktraceBuilder; 445 446 private: 447 // Offsets 448 enum { 449 hc_backtrace_offset = 0, 450 hc_detailMessage_offset = 1, 451 hc_cause_offset = 2, // New since 1.4 452 hc_stackTrace_offset = 3 // New since 1.4 453 }; 454 enum { 455 hc_static_unassigned_stacktrace_offset = 0 // New since 1.7 456 }; 457 // Trace constants 458 enum { 459 trace_methods_offset = 0, 460 trace_bcis_offset = 1, 461 trace_next_offset = 2, 462 trace_size = 3, 463 trace_chunk_size = 32 464 }; 465 466 static int backtrace_offset; 467 static int detailMessage_offset; 468 static int cause_offset; 469 static int stackTrace_offset; 470 static int static_unassigned_stacktrace_offset; 471 472 // Printing 473 static char* print_stack_element_to_buffer(methodOop method, int bci); 474 static void print_to_stream(Handle stream, const char* str); 475 // StackTrace (programmatic access, new since 1.4) 476 static void clear_stacktrace(oop throwable); 477 // No stack trace available 478 static const char* no_stack_trace_message(); 479 // Stacktrace (post JDK 1.7.0 to allow immutability protocol to be followed) 480 static void set_stacktrace(oop throwable, oop st_element_array); 481 static oop unassigned_stacktrace(); 482 483 public: 484 // Backtrace 485 static oop backtrace(oop throwable); 486 static void set_backtrace(oop throwable, oop value); 487 // Needed by JVMTI to filter out this internal field. 488 static int get_backtrace_offset() { return backtrace_offset;} 489 static int get_detailMessage_offset() { return detailMessage_offset;} 490 // Message 491 static oop message(oop throwable); 492 static oop message(Handle throwable); 493 static void set_message(oop throwable, oop value); 494 // Print stack trace stored in exception by call-back to Java 495 // Note: this is no longer used in Merlin, but we still suppport 496 // it for compatibility. 497 static void print_stack_trace(oop throwable, oop print_stream); 498 static void print_stack_element(Handle stream, methodOop method, int bci); 499 static void print_stack_element(outputStream *st, methodOop method, int bci); 500 static void print_stack_usage(Handle stream); 501 502 // Allocate space for backtrace (created but stack trace not filled in) 503 static void allocate_backtrace(Handle throwable, TRAPS); 504 // Fill in current stack trace for throwable with preallocated backtrace (no GC) 505 static void fill_in_stack_trace_of_preallocated_backtrace(Handle throwable); 506 // Fill in current stack trace, can cause GC 507 static void fill_in_stack_trace(Handle throwable, methodHandle method, TRAPS); 508 static void fill_in_stack_trace(Handle throwable, methodHandle method = methodHandle()); 509 // Programmatic access to stack trace 510 static oop get_stack_trace_element(oop throwable, int index, TRAPS); 511 static int get_stack_trace_depth(oop throwable, TRAPS); 512 // Printing 513 static void print(oop throwable, outputStream* st); 514 static void print(Handle throwable, outputStream* st); 515 static void print_stack_trace(oop throwable, outputStream* st); 516 // Debugging 517 friend class JavaClasses; 518 }; 519 520 521 // Interface to java.lang.reflect.AccessibleObject objects 522 523 class java_lang_reflect_AccessibleObject: AllStatic { 524 private: 525 // Note that to reduce dependencies on the JDK we compute these 526 // offsets at run-time. 527 static int override_offset; 528 529 static void compute_offsets(); 530 531 public: 532 // Accessors 533 static jboolean override(oop reflect); 534 static void set_override(oop reflect, jboolean value); 535 536 // Debugging 537 friend class JavaClasses; 538 }; 539 540 541 // Interface to java.lang.reflect.Method objects 542 543 class java_lang_reflect_Method : public java_lang_reflect_AccessibleObject { 544 private: 545 // Note that to reduce dependencies on the JDK we compute these 546 // offsets at run-time. 547 static int clazz_offset; 548 static int name_offset; 549 static int returnType_offset; 550 static int parameterTypes_offset; 551 static int exceptionTypes_offset; 552 static int slot_offset; 553 static int modifiers_offset; 554 static int signature_offset; 555 static int annotations_offset; 556 static int parameter_annotations_offset; 557 static int annotation_default_offset; 558 559 static void compute_offsets(); 560 561 public: 562 // Allocation 563 static Handle create(TRAPS); 564 565 // Accessors 566 static oop clazz(oop reflect); 567 static void set_clazz(oop reflect, oop value); 568 569 static oop name(oop method); 570 static void set_name(oop method, oop value); 571 572 static oop return_type(oop method); 573 static void set_return_type(oop method, oop value); 574 575 static oop parameter_types(oop method); 576 static void set_parameter_types(oop method, oop value); 577 578 static oop exception_types(oop method); 579 static void set_exception_types(oop method, oop value); 580 581 static int slot(oop reflect); 582 static void set_slot(oop reflect, int value); 583 584 static int modifiers(oop method); 585 static void set_modifiers(oop method, int value); 586 587 static bool has_signature_field(); 588 static oop signature(oop method); 589 static void set_signature(oop method, oop value); 590 591 static bool has_annotations_field(); 592 static oop annotations(oop method); 593 static void set_annotations(oop method, 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 static bool has_annotation_default_field(); 600 static oop annotation_default(oop method); 601 static void set_annotation_default(oop method, oop value); 602 603 // Debugging 604 friend class JavaClasses; 605 }; 606 607 608 // Interface to java.lang.reflect.Constructor objects 609 610 class java_lang_reflect_Constructor : public java_lang_reflect_AccessibleObject { 611 private: 612 // Note that to reduce dependencies on the JDK we compute these 613 // offsets at run-time. 614 static int clazz_offset; 615 static int parameterTypes_offset; 616 static int exceptionTypes_offset; 617 static int slot_offset; 618 static int modifiers_offset; 619 static int signature_offset; 620 static int annotations_offset; 621 static int parameter_annotations_offset; 622 623 static void compute_offsets(); 624 625 public: 626 // Allocation 627 static Handle create(TRAPS); 628 629 // Accessors 630 static oop clazz(oop reflect); 631 static void set_clazz(oop reflect, oop value); 632 633 static oop parameter_types(oop constructor); 634 static void set_parameter_types(oop constructor, oop value); 635 636 static oop exception_types(oop constructor); 637 static void set_exception_types(oop constructor, oop value); 638 639 static int slot(oop reflect); 640 static void set_slot(oop reflect, int value); 641 642 static int modifiers(oop constructor); 643 static void set_modifiers(oop constructor, int value); 644 645 static bool has_signature_field(); 646 static oop signature(oop constructor); 647 static void set_signature(oop constructor, oop value); 648 649 static bool has_annotations_field(); 650 static oop annotations(oop constructor); 651 static void set_annotations(oop constructor, oop value); 652 653 static bool has_parameter_annotations_field(); 654 static oop parameter_annotations(oop method); 655 static void set_parameter_annotations(oop method, oop value); 656 657 // Debugging 658 friend class JavaClasses; 659 }; 660 661 662 // Interface to java.lang.reflect.Field objects 663 664 class java_lang_reflect_Field : public java_lang_reflect_AccessibleObject { 665 private: 666 // Note that to reduce dependencies on the JDK we compute these 667 // offsets at run-time. 668 static int clazz_offset; 669 static int name_offset; 670 static int type_offset; 671 static int slot_offset; 672 static int modifiers_offset; 673 static int signature_offset; 674 static int annotations_offset; 675 676 static void compute_offsets(); 677 678 public: 679 // Allocation 680 static Handle create(TRAPS); 681 682 // Accessors 683 static oop clazz(oop reflect); 684 static void set_clazz(oop reflect, oop value); 685 686 static oop name(oop field); 687 static void set_name(oop field, oop value); 688 689 static oop type(oop field); 690 static void set_type(oop field, oop value); 691 692 static int slot(oop reflect); 693 static void set_slot(oop reflect, int value); 694 695 static int modifiers(oop field); 696 static void set_modifiers(oop field, int value); 697 698 static bool has_signature_field(); 699 static oop signature(oop constructor); 700 static void set_signature(oop constructor, oop value); 701 702 static bool has_annotations_field(); 703 static oop annotations(oop constructor); 704 static void set_annotations(oop constructor, oop value); 705 706 static bool has_parameter_annotations_field(); 707 static oop parameter_annotations(oop method); 708 static void set_parameter_annotations(oop method, oop value); 709 710 static bool has_annotation_default_field(); 711 static oop annotation_default(oop method); 712 static void set_annotation_default(oop method, oop value); 713 714 // Debugging 715 friend class JavaClasses; 716 }; 717 718 // Interface to sun.reflect.ConstantPool objects 719 class sun_reflect_ConstantPool { 720 private: 721 // Note that to reduce dependencies on the JDK we compute these 722 // offsets at run-time. 723 static int _cp_oop_offset; 724 725 static void compute_offsets(); 726 727 public: 728 // Allocation 729 static Handle create(TRAPS); 730 731 // Accessors 732 static oop cp_oop(oop reflect); 733 static void set_cp_oop(oop reflect, oop value); 734 static int cp_oop_offset() { 735 return _cp_oop_offset; 736 } 737 738 // Debugging 739 friend class JavaClasses; 740 }; 741 742 // Interface to sun.reflect.UnsafeStaticFieldAccessorImpl objects 743 class sun_reflect_UnsafeStaticFieldAccessorImpl { 744 private: 745 static int _base_offset; 746 static void compute_offsets(); 747 748 public: 749 static int base_offset() { 750 return _base_offset; 751 } 752 753 // Debugging 754 friend class JavaClasses; 755 }; 756 757 // Interface to java.lang primitive type boxing objects: 758 // - java.lang.Boolean 759 // - java.lang.Character 760 // - java.lang.Float 761 // - java.lang.Double 762 // - java.lang.Byte 763 // - java.lang.Short 764 // - java.lang.Integer 765 // - java.lang.Long 766 767 // This could be separated out into 8 individual classes. 768 769 class java_lang_boxing_object: AllStatic { 770 private: 771 enum { 772 hc_value_offset = 0 773 }; 774 static int value_offset; 775 static int long_value_offset; 776 777 static oop initialize_and_allocate(BasicType type, TRAPS); 778 public: 779 // Allocation. Returns a boxed value, or NULL for invalid type. 780 static oop create(BasicType type, jvalue* value, TRAPS); 781 // Accessors. Returns the basic type being boxed, or T_ILLEGAL for invalid oop. 782 static BasicType get_value(oop box, jvalue* value); 783 static BasicType set_value(oop box, jvalue* value); 784 static BasicType basic_type(oop box); 785 static bool is_instance(oop box) { return basic_type(box) != T_ILLEGAL; } 786 static bool is_instance(oop box, BasicType type) { return basic_type(box) == type; } 787 static void print(oop box, outputStream* st) { jvalue value; print(get_value(box, &value), &value, st); } 788 static void print(BasicType type, jvalue* value, outputStream* st); 789 790 static int value_offset_in_bytes(BasicType type) { 791 return ( type == T_LONG || type == T_DOUBLE ) ? long_value_offset : 792 value_offset; 793 } 794 795 // Debugging 796 friend class JavaClasses; 797 }; 798 799 800 801 // Interface to java.lang.ref.Reference objects 802 803 class java_lang_ref_Reference: AllStatic { 804 public: 805 enum { 806 hc_referent_offset = 0, 807 hc_queue_offset = 1, 808 hc_next_offset = 2, 809 hc_discovered_offset = 3 // Is not last, see SoftRefs. 810 }; 811 enum { 812 hc_static_lock_offset = 0, 813 hc_static_pending_offset = 1 814 }; 815 816 static int referent_offset; 817 static int queue_offset; 818 static int next_offset; 819 static int discovered_offset; 820 static int static_lock_offset; 821 static int static_pending_offset; 822 static int number_of_fake_oop_fields; 823 824 // Accessors 825 static oop referent(oop ref) { 826 return ref->obj_field(referent_offset); 827 } 828 static void set_referent(oop ref, oop value) { 829 ref->obj_field_put(referent_offset, value); 830 } 831 static void set_referent_raw(oop ref, oop value) { 832 ref->obj_field_put_raw(referent_offset, value); 833 } 834 static HeapWord* referent_addr(oop ref) { 835 return ref->obj_field_addr<HeapWord>(referent_offset); 836 } 837 static oop next(oop ref) { 838 return ref->obj_field(next_offset); 839 } 840 static void set_next(oop ref, oop value) { 841 ref->obj_field_put(next_offset, value); 842 } 843 static void set_next_raw(oop ref, oop value) { 844 ref->obj_field_put_raw(next_offset, value); 845 } 846 static HeapWord* next_addr(oop ref) { 847 return ref->obj_field_addr<HeapWord>(next_offset); 848 } 849 static oop discovered(oop ref) { 850 return ref->obj_field(discovered_offset); 851 } 852 static void set_discovered(oop ref, oop value) { 853 ref->obj_field_put(discovered_offset, value); 854 } 855 static void set_discovered_raw(oop ref, oop value) { 856 ref->obj_field_put_raw(discovered_offset, value); 857 } 858 static HeapWord* discovered_addr(oop ref) { 859 return ref->obj_field_addr<HeapWord>(discovered_offset); 860 } 861 // Accessors for statics 862 static oop pending_list_lock(); 863 static oop pending_list(); 864 865 static HeapWord* pending_list_addr(); 866 }; 867 868 869 // Interface to java.lang.ref.SoftReference objects 870 871 class java_lang_ref_SoftReference: public java_lang_ref_Reference { 872 public: 873 enum { 874 // The timestamp is a long field and may need to be adjusted for alignment. 875 hc_timestamp_offset = hc_discovered_offset + 1 876 }; 877 enum { 878 hc_static_clock_offset = 0 879 }; 880 881 static int timestamp_offset; 882 static int static_clock_offset; 883 884 // Accessors 885 static jlong timestamp(oop ref); 886 887 // Accessors for statics 888 static jlong clock(); 889 static void set_clock(jlong value); 890 }; 891 892 893 // Interface to java.lang.invoke.MethodHandle objects 894 895 class MethodHandleEntry; 896 897 class java_lang_invoke_MethodHandle: AllStatic { 898 friend class JavaClasses; 899 900 private: 901 static int _type_offset; // the MethodType of this MH 902 static int _form_offset; // the LambdaForm of this MH 903 904 static void compute_offsets(); 905 906 public: 907 // Accessors 908 static oop type(oop mh); 909 static void set_type(oop mh, oop mtype); 910 911 static oop form(oop mh); 912 static void set_form(oop mh, oop lform); 913 914 // Testers 915 static bool is_subclass(klassOop klass) { 916 return Klass::cast(klass)->is_subclass_of(SystemDictionary::MethodHandle_klass()); 917 } 918 static bool is_instance(oop obj) { 919 return obj != NULL && is_subclass(obj->klass()); 920 } 921 922 // Accessors for code generation: 923 static int type_offset_in_bytes() { return _type_offset; } 924 static int form_offset_in_bytes() { return _form_offset; } 925 }; 926 927 // Interface to java.lang.invoke.DirectMethodHandle objects 928 929 class java_lang_invoke_DirectMethodHandle: AllStatic { 930 friend class JavaClasses; 931 932 private: 933 static int _member_offset; // the MemberName of this DMH 934 935 static void compute_offsets(); 936 937 public: 938 // Accessors 939 static oop member(oop mh); 940 941 // Testers 942 static bool is_subclass(klassOop klass) { 943 return Klass::cast(klass)->is_subclass_of(SystemDictionary::DirectMethodHandle_klass()); 944 } 945 static bool is_instance(oop obj) { 946 return obj != NULL && is_subclass(obj->klass()); 947 } 948 949 // Accessors for code generation: 950 static int member_offset_in_bytes() { return _member_offset; } 951 }; 952 953 // Interface to java.lang.invoke.LambdaForm objects 954 // (These are a private interface for managing adapter code generation.) 955 956 class java_lang_invoke_LambdaForm: AllStatic { 957 friend class JavaClasses; 958 959 private: 960 static int _vmentry_offset; // type is MemberName 961 962 static void compute_offsets(); 963 964 public: 965 // Accessors 966 static oop vmentry(oop lform); 967 static void set_vmentry(oop lform, oop invoker); 968 969 // Testers 970 static bool is_subclass(klassOop klass) { 971 return SystemDictionary::LambdaForm_klass() != NULL && 972 Klass::cast(klass)->is_subclass_of(SystemDictionary::LambdaForm_klass()); 973 } 974 static bool is_instance(oop obj) { 975 return obj != NULL && is_subclass(obj->klass()); 976 } 977 978 // Accessors for code generation: 979 static int vmentry_offset_in_bytes() { return _vmentry_offset; } 980 }; 981 982 983 // Interface to java.lang.invoke.MemberName objects 984 // (These are a private interface for Java code to query the class hierarchy.) 985 986 #define MEMBERNAME_INJECTED_FIELDS(macro) \ 987 macro(java_lang_invoke_MemberName, vmindex, intptr_signature, false) \ 988 macro(java_lang_invoke_MemberName, vmtarget, object_signature, false) 989 990 class java_lang_invoke_MemberName: AllStatic { 991 friend class JavaClasses; 992 993 private: 994 // From java.lang.invoke.MemberName: 995 // private Class<?> clazz; // class in which the method is defined 996 // private String name; // may be null if not yet materialized 997 // private Object type; // may be null if not yet materialized 998 // private int flags; // modifier bits; see reflect.Modifier 999 // private Object vmtarget; // VM-specific target value 1000 // private intptr_t vmindex; // member index within class or interface 1001 static int _clazz_offset; 1002 static int _name_offset; 1003 static int _type_offset; 1004 static int _flags_offset; 1005 static int _vmtarget_offset; 1006 static int _vmindex_offset; 1007 1008 static void compute_offsets(); 1009 1010 public: 1011 // Accessors 1012 static oop clazz(oop mname); 1013 static void set_clazz(oop mname, oop clazz); 1014 1015 static oop type(oop mname); 1016 static void set_type(oop mname, oop type); 1017 1018 static oop name(oop mname); 1019 static void set_name(oop mname, oop name); 1020 1021 static int flags(oop mname); 1022 static void set_flags(oop mname, int flags); 1023 1024 static oop vmtarget(oop mname); 1025 static void set_vmtarget(oop mname, oop target); 1026 static void adjust_vmtarget(oop mname, oop target); 1027 1028 static intptr_t vmindex(oop mname); 1029 static void set_vmindex(oop mname, intptr_t index); 1030 1031 // Testers 1032 static bool is_subclass(klassOop klass) { 1033 return Klass::cast(klass)->is_subclass_of(SystemDictionary::MemberName_klass()); 1034 } 1035 static bool is_instance(oop obj) { 1036 return obj != NULL && is_subclass(obj->klass()); 1037 } 1038 1039 // Relevant integer codes (keep these in synch. with MethodHandleNatives.Constants): 1040 enum { 1041 MN_IS_METHOD = 0x00010000, // method (not constructor) 1042 MN_IS_CONSTRUCTOR = 0x00020000, // constructor 1043 MN_IS_FIELD = 0x00040000, // field 1044 MN_IS_TYPE = 0x00080000, // nested type 1045 MN_REFERENCE_KIND_SHIFT = 24, // refKind 1046 MN_REFERENCE_KIND_MASK = 0x0F000000 >> MN_REFERENCE_KIND_SHIFT, 1047 // The SEARCH_* bits are not for MN.flags but for the matchFlags argument of MHN.getMembers: 1048 MN_SEARCH_SUPERCLASSES = 0x00100000, // walk super classes 1049 MN_SEARCH_INTERFACES = 0x00200000 // walk implemented interfaces 1050 }; 1051 1052 // Accessors for code generation: 1053 static int clazz_offset_in_bytes() { return _clazz_offset; } 1054 static int type_offset_in_bytes() { return _type_offset; } 1055 static int name_offset_in_bytes() { return _name_offset; } 1056 static int flags_offset_in_bytes() { return _flags_offset; } 1057 static int vmtarget_offset_in_bytes() { return _vmtarget_offset; } 1058 static int vmindex_offset_in_bytes() { return _vmindex_offset; } 1059 }; 1060 1061 1062 // Interface to java.lang.invoke.MethodType objects 1063 1064 class java_lang_invoke_MethodType: AllStatic { 1065 friend class JavaClasses; 1066 1067 private: 1068 static int _rtype_offset; 1069 static int _ptypes_offset; 1070 1071 static void compute_offsets(); 1072 1073 public: 1074 // Accessors 1075 static oop rtype(oop mt); 1076 static objArrayOop ptypes(oop mt); 1077 1078 static oop ptype(oop mt, int index); 1079 static int ptype_count(oop mt); 1080 1081 static int ptype_slot_count(oop mt); // extra counts for long/double 1082 static int rtype_slot_count(oop mt); // extra counts for long/double 1083 1084 static Symbol* as_signature(oop mt, bool intern_if_not_found, TRAPS); 1085 static void print_signature(oop mt, outputStream* st); 1086 1087 static bool is_instance(oop obj) { 1088 return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass(); 1089 } 1090 1091 static bool equals(oop mt1, oop mt2); 1092 1093 // Accessors for code generation: 1094 static int rtype_offset_in_bytes() { return _rtype_offset; } 1095 static int ptypes_offset_in_bytes() { return _ptypes_offset; } 1096 }; 1097 1098 1099 // Interface to java.lang.invoke.CallSite objects 1100 1101 class java_lang_invoke_CallSite: AllStatic { 1102 friend class JavaClasses; 1103 1104 private: 1105 static int _target_offset; 1106 1107 static void compute_offsets(); 1108 1109 public: 1110 // Accessors 1111 static oop target( oop site) { return site->obj_field( _target_offset); } 1112 static void set_target( oop site, oop target) { site->obj_field_put( _target_offset, target); } 1113 1114 static volatile oop target_volatile(oop site) { return site->obj_field_volatile( _target_offset); } 1115 static void set_target_volatile(oop site, oop target) { site->obj_field_put_volatile(_target_offset, target); } 1116 1117 // Testers 1118 static bool is_subclass(klassOop klass) { 1119 return Klass::cast(klass)->is_subclass_of(SystemDictionary::CallSite_klass()); 1120 } 1121 static bool is_instance(oop obj) { 1122 return obj != NULL && is_subclass(obj->klass()); 1123 } 1124 1125 // Accessors for code generation: 1126 static int target_offset_in_bytes() { return _target_offset; } 1127 }; 1128 1129 1130 // Interface to java.security.AccessControlContext objects 1131 1132 class java_security_AccessControlContext: AllStatic { 1133 private: 1134 // Note that for this class the layout changed between JDK1.2 and JDK1.3, 1135 // so we compute the offsets at startup rather than hard-wiring them. 1136 static int _context_offset; 1137 static int _privilegedContext_offset; 1138 static int _isPrivileged_offset; 1139 static int _isAuthorized_offset; 1140 1141 static void compute_offsets(); 1142 public: 1143 static oop create(objArrayHandle context, bool isPrivileged, Handle privileged_context, TRAPS); 1144 1145 static bool is_authorized(Handle context); 1146 1147 // Debugging/initialization 1148 friend class JavaClasses; 1149 }; 1150 1151 1152 // Interface to java.lang.ClassLoader objects 1153 1154 class java_lang_ClassLoader : AllStatic { 1155 private: 1156 enum { 1157 hc_parent_offset = 0 1158 }; 1159 1160 static bool offsets_computed; 1161 static int parent_offset; 1162 static int parallelCapable_offset; 1163 1164 static void compute_offsets(); 1165 1166 public: 1167 static oop parent(oop loader); 1168 static bool isAncestor(oop loader, oop cl); 1169 1170 // Support for parallelCapable field 1171 static bool parallelCapable(oop the_class_mirror); 1172 1173 static bool is_trusted_loader(oop loader); 1174 1175 // Fix for 4474172 1176 static oop non_reflection_class_loader(oop loader); 1177 1178 // Testers 1179 static bool is_subclass(klassOop klass) { 1180 return Klass::cast(klass)->is_subclass_of(SystemDictionary::ClassLoader_klass()); 1181 } 1182 static bool is_instance(oop obj) { 1183 return obj != NULL && is_subclass(obj->klass()); 1184 } 1185 1186 // Debugging 1187 friend class JavaClasses; 1188 }; 1189 1190 1191 // Interface to java.lang.System objects 1192 1193 class java_lang_System : AllStatic { 1194 private: 1195 enum { 1196 hc_static_in_offset = 0, 1197 hc_static_out_offset = 1, 1198 hc_static_err_offset = 2, 1199 hc_static_security_offset = 3 1200 }; 1201 1202 static int static_in_offset; 1203 static int static_out_offset; 1204 static int static_err_offset; 1205 static int static_security_offset; 1206 1207 public: 1208 static int in_offset_in_bytes(); 1209 static int out_offset_in_bytes(); 1210 static int err_offset_in_bytes(); 1211 1212 static bool has_security_manager(); 1213 1214 // Debugging 1215 friend class JavaClasses; 1216 }; 1217 1218 1219 // Interface to java.lang.StackTraceElement objects 1220 1221 class java_lang_StackTraceElement: AllStatic { 1222 private: 1223 enum { 1224 hc_declaringClass_offset = 0, 1225 hc_methodName_offset = 1, 1226 hc_fileName_offset = 2, 1227 hc_lineNumber_offset = 3 1228 }; 1229 1230 static int declaringClass_offset; 1231 static int methodName_offset; 1232 static int fileName_offset; 1233 static int lineNumber_offset; 1234 1235 public: 1236 // Setters 1237 static void set_declaringClass(oop element, oop value); 1238 static void set_methodName(oop element, oop value); 1239 static void set_fileName(oop element, oop value); 1240 static void set_lineNumber(oop element, int value); 1241 1242 // Create an instance of StackTraceElement 1243 static oop create(methodHandle m, int bci, TRAPS); 1244 1245 // Debugging 1246 friend class JavaClasses; 1247 }; 1248 1249 1250 // Interface to java.lang.AssertionStatusDirectives objects 1251 1252 class java_lang_AssertionStatusDirectives: AllStatic { 1253 private: 1254 enum { 1255 hc_classes_offset, 1256 hc_classEnabled_offset, 1257 hc_packages_offset, 1258 hc_packageEnabled_offset, 1259 hc_deflt_offset 1260 }; 1261 1262 static int classes_offset; 1263 static int classEnabled_offset; 1264 static int packages_offset; 1265 static int packageEnabled_offset; 1266 static int deflt_offset; 1267 1268 public: 1269 // Setters 1270 static void set_classes(oop obj, oop val); 1271 static void set_classEnabled(oop obj, oop val); 1272 static void set_packages(oop obj, oop val); 1273 static void set_packageEnabled(oop obj, oop val); 1274 static void set_deflt(oop obj, bool val); 1275 // Debugging 1276 friend class JavaClasses; 1277 }; 1278 1279 1280 class java_nio_Buffer: AllStatic { 1281 private: 1282 static int _limit_offset; 1283 1284 public: 1285 static int limit_offset(); 1286 static void compute_offsets(); 1287 }; 1288 1289 class java_util_concurrent_locks_AbstractOwnableSynchronizer : AllStatic { 1290 private: 1291 static int _owner_offset; 1292 public: 1293 static void initialize(TRAPS); 1294 static oop get_owner_threadObj(oop obj); 1295 }; 1296 1297 // Use to declare fields that need to be injected into Java classes 1298 // for the JVM to use. The name_index and signature_index are 1299 // declared in vmSymbols. The may_be_java flag is used to declare 1300 // fields that might already exist in Java but should be injected if 1301 // they don't. Otherwise the field is unconditionally injected and 1302 // the JVM uses the injected one. This is to ensure that name 1303 // collisions don't occur. In general may_be_java should be false 1304 // unless there's a good reason. 1305 1306 class InjectedField { 1307 public: 1308 const SystemDictionary::WKID klass_id; 1309 const vmSymbols::SID name_index; 1310 const vmSymbols::SID signature_index; 1311 const bool may_be_java; 1312 1313 1314 klassOop klass() const { return SystemDictionary::well_known_klass(klass_id); } 1315 Symbol* name() const { return lookup_symbol(name_index); } 1316 Symbol* signature() const { return lookup_symbol(signature_index); } 1317 1318 int compute_offset(); 1319 1320 // Find the Symbol for this index 1321 static Symbol* lookup_symbol(int symbol_index) { 1322 return vmSymbols::symbol_at((vmSymbols::SID)symbol_index); 1323 } 1324 }; 1325 1326 #define DECLARE_INJECTED_FIELD_ENUM(klass, name, signature, may_be_java) \ 1327 klass##_##name##_enum, 1328 1329 #define ALL_INJECTED_FIELDS(macro) \ 1330 CLASS_INJECTED_FIELDS(macro) \ 1331 MEMBERNAME_INJECTED_FIELDS(macro) 1332 1333 // Interface to hard-coded offset checking 1334 1335 class JavaClasses : AllStatic { 1336 private: 1337 1338 static InjectedField _injected_fields[]; 1339 1340 static bool check_offset(const char *klass_name, int offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1341 static bool check_static_offset(const char *klass_name, int hardcoded_offset, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1342 static bool check_constant(const char *klass_name, int constant, const char *field_name, const char* field_sig) PRODUCT_RETURN0; 1343 1344 public: 1345 enum InjectedFieldID { 1346 ALL_INJECTED_FIELDS(DECLARE_INJECTED_FIELD_ENUM) 1347 MAX_enum 1348 }; 1349 1350 static int compute_injected_offset(InjectedFieldID id); 1351 1352 static void compute_hard_coded_offsets(); 1353 static void compute_offsets(); 1354 static void check_offsets() PRODUCT_RETURN; 1355 1356 static InjectedField* get_injected(Symbol* class_name, int* field_count); 1357 }; 1358 1359 #undef DECLARE_INJECTED_FIELD_ENUM 1360 1361 #endif // SHARE_VM_CLASSFILE_JAVACLASSES_HPP