1 /* 2 * Copyright (c) 2005, 2010, 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 # include "incls/_precompiled.incl" 26 # include "incls/_heapDumper.cpp.incl" 27 28 /* 29 * HPROF binary format - description copied from: 30 * src/share/demo/jvmti/hprof/hprof_io.c 31 * 32 * 33 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2" 34 * (0-terminated) 35 * 36 * u4 size of identifiers. Identifiers are used to represent 37 * UTF8 strings, objects, stack traces, etc. They usually 38 * have the same size as host pointers. For example, on 39 * Solaris and Win32, the size is 4. 40 * u4 high word 41 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 42 * [record]* a sequence of records. 43 * 44 * 45 * Record format: 46 * 47 * u1 a TAG denoting the type of the record 48 * u4 number of *microseconds* since the time stamp in the 49 * header. (wraps around in a little more than an hour) 50 * u4 number of bytes *remaining* in the record. Note that 51 * this number excludes the tag and the length field itself. 52 * [u1]* BODY of the record (a sequence of bytes) 53 * 54 * 55 * The following TAGs are supported: 56 * 57 * TAG BODY notes 58 *---------------------------------------------------------- 59 * HPROF_UTF8 a UTF8-encoded name 60 * 61 * id name ID 62 * [u1]* UTF8 characters (no trailing zero) 63 * 64 * HPROF_LOAD_CLASS a newly loaded class 65 * 66 * u4 class serial number (> 0) 67 * id class object ID 68 * u4 stack trace serial number 69 * id class name ID 70 * 71 * HPROF_UNLOAD_CLASS an unloading class 72 * 73 * u4 class serial_number 74 * 75 * HPROF_FRAME a Java stack frame 76 * 77 * id stack frame ID 78 * id method name ID 79 * id method signature ID 80 * id source file name ID 81 * u4 class serial number 82 * i4 line number. >0: normal 83 * -1: unknown 84 * -2: compiled method 85 * -3: native method 86 * 87 * HPROF_TRACE a Java stack trace 88 * 89 * u4 stack trace serial number 90 * u4 thread serial number 91 * u4 number of frames 92 * [id]* stack frame IDs 93 * 94 * 95 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC 96 * 97 * u2 flags 0x0001: incremental vs. complete 98 * 0x0002: sorted by allocation vs. live 99 * 0x0004: whether to force a GC 100 * u4 cutoff ratio 101 * u4 total live bytes 102 * u4 total live instances 103 * u8 total bytes allocated 104 * u8 total instances allocated 105 * u4 number of sites that follow 106 * [u1 is_array: 0: normal object 107 * 2: object array 108 * 4: boolean array 109 * 5: char array 110 * 6: float array 111 * 7: double array 112 * 8: byte array 113 * 9: short array 114 * 10: int array 115 * 11: long array 116 * u4 class serial number (may be zero during startup) 117 * u4 stack trace serial number 118 * u4 number of bytes alive 119 * u4 number of instances alive 120 * u4 number of bytes allocated 121 * u4]* number of instance allocated 122 * 123 * HPROF_START_THREAD a newly started thread. 124 * 125 * u4 thread serial number (> 0) 126 * id thread object ID 127 * u4 stack trace serial number 128 * id thread name ID 129 * id thread group name ID 130 * id thread group parent name ID 131 * 132 * HPROF_END_THREAD a terminating thread. 133 * 134 * u4 thread serial number 135 * 136 * HPROF_HEAP_SUMMARY heap summary 137 * 138 * u4 total live bytes 139 * u4 total live instances 140 * u8 total bytes allocated 141 * u8 total instances allocated 142 * 143 * HPROF_HEAP_DUMP denote a heap dump 144 * 145 * [heap dump sub-records]* 146 * 147 * There are four kinds of heap dump sub-records: 148 * 149 * u1 sub-record type 150 * 151 * HPROF_GC_ROOT_UNKNOWN unknown root 152 * 153 * id object ID 154 * 155 * HPROF_GC_ROOT_THREAD_OBJ thread object 156 * 157 * id thread object ID (may be 0 for a 158 * thread newly attached through JNI) 159 * u4 thread sequence number 160 * u4 stack trace sequence number 161 * 162 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root 163 * 164 * id object ID 165 * id JNI global ref ID 166 * 167 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref 168 * 169 * id object ID 170 * u4 thread serial number 171 * u4 frame # in stack trace (-1 for empty) 172 * 173 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame 174 * 175 * id object ID 176 * u4 thread serial number 177 * u4 frame # in stack trace (-1 for empty) 178 * 179 * HPROF_GC_ROOT_NATIVE_STACK Native stack 180 * 181 * id object ID 182 * u4 thread serial number 183 * 184 * HPROF_GC_ROOT_STICKY_CLASS System class 185 * 186 * id object ID 187 * 188 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block 189 * 190 * id object ID 191 * u4 thread serial number 192 * 193 * HPROF_GC_ROOT_MONITOR_USED Busy monitor 194 * 195 * id object ID 196 * 197 * HPROF_GC_CLASS_DUMP dump of a class object 198 * 199 * id class object ID 200 * u4 stack trace serial number 201 * id super class object ID 202 * id class loader object ID 203 * id signers object ID 204 * id protection domain object ID 205 * id reserved 206 * id reserved 207 * 208 * u4 instance size (in bytes) 209 * 210 * u2 size of constant pool 211 * [u2, constant pool index, 212 * ty, type 213 * 2: object 214 * 4: boolean 215 * 5: char 216 * 6: float 217 * 7: double 218 * 8: byte 219 * 9: short 220 * 10: int 221 * 11: long 222 * vl]* and value 223 * 224 * u2 number of static fields 225 * [id, static field name, 226 * ty, type, 227 * vl]* and value 228 * 229 * u2 number of inst. fields (not inc. super) 230 * [id, instance field name, 231 * ty]* type 232 * 233 * HPROF_GC_INSTANCE_DUMP dump of a normal object 234 * 235 * id object ID 236 * u4 stack trace serial number 237 * id class object ID 238 * u4 number of bytes that follow 239 * [vl]* instance field values (class, followed 240 * by super, super's super ...) 241 * 242 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array 243 * 244 * id array object ID 245 * u4 stack trace serial number 246 * u4 number of elements 247 * id array class ID 248 * [id]* elements 249 * 250 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array 251 * 252 * id array object ID 253 * u4 stack trace serial number 254 * u4 number of elements 255 * u1 element type 256 * 4: boolean array 257 * 5: char array 258 * 6: float array 259 * 7: double array 260 * 8: byte array 261 * 9: short array 262 * 10: int array 263 * 11: long array 264 * [u1]* elements 265 * 266 * HPROF_CPU_SAMPLES a set of sample traces of running threads 267 * 268 * u4 total number of samples 269 * u4 # of traces 270 * [u4 # of samples 271 * u4]* stack trace serial number 272 * 273 * HPROF_CONTROL_SETTINGS the settings of on/off switches 274 * 275 * u4 0x00000001: alloc traces on/off 276 * 0x00000002: cpu sampling on/off 277 * u2 stack trace depth 278 * 279 * 280 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally 281 * be generated as a sequence of heap dump segments. This sequence is 282 * terminated by an end record. The additional tags allowed by format 283 * "JAVA PROFILE 1.0.2" are: 284 * 285 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment 286 * 287 * [heap dump sub-records]* 288 * The same sub-record types allowed by HPROF_HEAP_DUMP 289 * 290 * HPROF_HEAP_DUMP_END denotes the end of a heap dump 291 * 292 */ 293 294 295 // HPROF tags 296 297 typedef enum { 298 // top-level records 299 HPROF_UTF8 = 0x01, 300 HPROF_LOAD_CLASS = 0x02, 301 HPROF_UNLOAD_CLASS = 0x03, 302 HPROF_FRAME = 0x04, 303 HPROF_TRACE = 0x05, 304 HPROF_ALLOC_SITES = 0x06, 305 HPROF_HEAP_SUMMARY = 0x07, 306 HPROF_START_THREAD = 0x0A, 307 HPROF_END_THREAD = 0x0B, 308 HPROF_HEAP_DUMP = 0x0C, 309 HPROF_CPU_SAMPLES = 0x0D, 310 HPROF_CONTROL_SETTINGS = 0x0E, 311 312 // 1.0.2 record types 313 HPROF_HEAP_DUMP_SEGMENT = 0x1C, 314 HPROF_HEAP_DUMP_END = 0x2C, 315 316 // field types 317 HPROF_ARRAY_OBJECT = 0x01, 318 HPROF_NORMAL_OBJECT = 0x02, 319 HPROF_BOOLEAN = 0x04, 320 HPROF_CHAR = 0x05, 321 HPROF_FLOAT = 0x06, 322 HPROF_DOUBLE = 0x07, 323 HPROF_BYTE = 0x08, 324 HPROF_SHORT = 0x09, 325 HPROF_INT = 0x0A, 326 HPROF_LONG = 0x0B, 327 328 // data-dump sub-records 329 HPROF_GC_ROOT_UNKNOWN = 0xFF, 330 HPROF_GC_ROOT_JNI_GLOBAL = 0x01, 331 HPROF_GC_ROOT_JNI_LOCAL = 0x02, 332 HPROF_GC_ROOT_JAVA_FRAME = 0x03, 333 HPROF_GC_ROOT_NATIVE_STACK = 0x04, 334 HPROF_GC_ROOT_STICKY_CLASS = 0x05, 335 HPROF_GC_ROOT_THREAD_BLOCK = 0x06, 336 HPROF_GC_ROOT_MONITOR_USED = 0x07, 337 HPROF_GC_ROOT_THREAD_OBJ = 0x08, 338 HPROF_GC_CLASS_DUMP = 0x20, 339 HPROF_GC_INSTANCE_DUMP = 0x21, 340 HPROF_GC_OBJ_ARRAY_DUMP = 0x22, 341 HPROF_GC_PRIM_ARRAY_DUMP = 0x23 342 } hprofTag; 343 344 // Default stack trace ID (used for dummy HPROF_TRACE record) 345 enum { 346 STACK_TRACE_ID = 1, 347 INITIAL_CLASS_COUNT = 200 348 }; 349 350 // Supports I/O operations on a dump file 351 352 class DumpWriter : public StackObj { 353 private: 354 enum { 355 io_buffer_size = 8*M 356 }; 357 358 int _fd; // file descriptor (-1 if dump file not open) 359 jlong _bytes_written; // number of byte written to dump file 360 361 char* _buffer; // internal buffer 362 int _size; 363 int _pos; 364 365 char* _error; // error message when I/O fails 366 367 void set_file_descriptor(int fd) { _fd = fd; } 368 int file_descriptor() const { return _fd; } 369 370 char* buffer() const { return _buffer; } 371 int buffer_size() const { return _size; } 372 int position() const { return _pos; } 373 void set_position(int pos) { _pos = pos; } 374 375 void set_error(const char* error) { _error = (char*)os::strdup(error); } 376 377 // all I/O go through this function 378 void write_internal(void* s, int len); 379 380 public: 381 DumpWriter(const char* path); 382 ~DumpWriter(); 383 384 void close(); 385 bool is_open() const { return file_descriptor() >= 0; } 386 void flush(); 387 388 // total number of bytes written to the disk 389 jlong bytes_written() const { return _bytes_written; } 390 391 // adjust the number of bytes written to disk (used to keep the count 392 // of the number of bytes written in case of rewrites) 393 void adjust_bytes_written(jlong n) { _bytes_written += n; } 394 395 // number of (buffered) bytes as yet unwritten to the dump file 396 jlong bytes_unwritten() const { return (jlong)position(); } 397 398 char* error() const { return _error; } 399 400 jlong current_offset(); 401 void seek_to_offset(jlong pos); 402 403 // writer functions 404 void write_raw(void* s, int len); 405 void write_u1(u1 x) { write_raw((void*)&x, 1); } 406 void write_u2(u2 x); 407 void write_u4(u4 x); 408 void write_u8(u8 x); 409 void write_objectID(oop o); 410 void write_classID(Klass* k); 411 void write_id(u4 x); 412 }; 413 414 DumpWriter::DumpWriter(const char* path) { 415 // try to allocate an I/O buffer of io_buffer_size. If there isn't 416 // sufficient memory then reduce size until we can allocate something. 417 _size = io_buffer_size; 418 do { 419 _buffer = (char*)os::malloc(_size); 420 if (_buffer == NULL) { 421 _size = _size >> 1; 422 } 423 } while (_buffer == NULL && _size > 0); 424 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 425 _pos = 0; 426 _error = NULL; 427 _bytes_written = 0L; 428 _fd = os::create_binary_file(path, false); // don't replace existing file 429 430 // if the open failed we record the error 431 if (_fd < 0) { 432 _error = (char*)os::strdup(strerror(errno)); 433 } 434 } 435 436 DumpWriter::~DumpWriter() { 437 // flush and close dump file 438 if (file_descriptor() >= 0) { 439 close(); 440 } 441 if (_buffer != NULL) os::free(_buffer); 442 if (_error != NULL) os::free(_error); 443 } 444 445 // closes dump file (if open) 446 void DumpWriter::close() { 447 // flush and close dump file 448 if (file_descriptor() >= 0) { 449 flush(); 450 ::close(file_descriptor()); 451 } 452 } 453 454 // write directly to the file 455 void DumpWriter::write_internal(void* s, int len) { 456 if (is_open()) { 457 int n = ::write(file_descriptor(), s, len); 458 if (n > 0) { 459 _bytes_written += n; 460 } 461 if (n != len) { 462 if (n < 0) { 463 set_error(strerror(errno)); 464 } else { 465 set_error("file size limit"); 466 } 467 ::close(file_descriptor()); 468 set_file_descriptor(-1); 469 } 470 } 471 } 472 473 // write raw bytes 474 void DumpWriter::write_raw(void* s, int len) { 475 if (is_open()) { 476 // flush buffer to make toom 477 if ((position()+ len) >= buffer_size()) { 478 flush(); 479 } 480 481 // buffer not available or too big to buffer it 482 if ((buffer() == NULL) || (len >= buffer_size())) { 483 write_internal(s, len); 484 } else { 485 // Should optimize this for u1/u2/u4/u8 sizes. 486 memcpy(buffer() + position(), s, len); 487 set_position(position() + len); 488 } 489 } 490 } 491 492 // flush any buffered bytes to the file 493 void DumpWriter::flush() { 494 if (is_open() && position() > 0) { 495 write_internal(buffer(), position()); 496 set_position(0); 497 } 498 } 499 500 501 jlong DumpWriter::current_offset() { 502 if (is_open()) { 503 // the offset is the file offset plus whatever we have buffered 504 jlong offset = os::current_file_offset(file_descriptor()); 505 assert(offset >= 0, "lseek failed"); 506 return offset + (jlong)position(); 507 } else { 508 return (jlong)-1; 509 } 510 } 511 512 void DumpWriter::seek_to_offset(jlong off) { 513 assert(off >= 0, "bad offset"); 514 515 // need to flush before seeking 516 flush(); 517 518 // may be closed due to I/O error 519 if (is_open()) { 520 jlong n = os::seek_to_file_offset(file_descriptor(), off); 521 assert(n >= 0, "lseek failed"); 522 } 523 } 524 525 void DumpWriter::write_u2(u2 x) { 526 u2 v; 527 Bytes::put_Java_u2((address)&v, x); 528 write_raw((void*)&v, 2); 529 } 530 531 void DumpWriter::write_u4(u4 x) { 532 u4 v; 533 Bytes::put_Java_u4((address)&v, x); 534 write_raw((void*)&v, 4); 535 } 536 537 void DumpWriter::write_u8(u8 x) { 538 u8 v; 539 Bytes::put_Java_u8((address)&v, x); 540 write_raw((void*)&v, 8); 541 } 542 543 void DumpWriter::write_objectID(oop o) { 544 address a = (address)((uintptr_t)o); 545 #ifdef _LP64 546 write_u8((u8)a); 547 #else 548 write_u4((u4)a); 549 #endif 550 } 551 552 void DumpWriter::write_id(u4 x) { 553 #ifdef _LP64 554 write_u8((u8) x); 555 #else 556 write_u4(x); 557 #endif 558 } 559 560 // We use java mirror as the class ID 561 void DumpWriter::write_classID(Klass* k) { 562 write_objectID(k->java_mirror()); 563 } 564 565 566 567 // Support class with a collection of functions used when dumping the heap 568 569 class DumperSupport : AllStatic { 570 public: 571 572 // write a header of the given type 573 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 574 575 // returns hprof tag for the given type signature 576 static hprofTag sig2tag(symbolOop sig); 577 // returns hprof tag for the given basic type 578 static hprofTag type2tag(BasicType type); 579 580 // returns the size of the instance of the given class 581 static u4 instance_size(klassOop k); 582 583 // dump a jfloat 584 static void dump_float(DumpWriter* writer, jfloat f); 585 // dump a jdouble 586 static void dump_double(DumpWriter* writer, jdouble d); 587 // dumps the raw value of the given field 588 static void dump_field_value(DumpWriter* writer, char type, address addr); 589 // dumps static fields of the given class 590 static void dump_static_fields(DumpWriter* writer, klassOop k); 591 // dump the raw values of the instance fields of the given object 592 static void dump_instance_fields(DumpWriter* writer, oop o); 593 // dumps the definition of the instance fields for a given class 594 static void dump_instance_field_descriptors(DumpWriter* writer, klassOop k); 595 // creates HPROF_GC_INSTANCE_DUMP record for the given object 596 static void dump_instance(DumpWriter* writer, oop o); 597 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 598 // array classes 599 static void dump_class_and_array_classes(DumpWriter* writer, klassOop k); 600 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 601 // class (and each multi-dimensional array class too) 602 static void dump_basic_type_array_class(DumpWriter* writer, klassOop k); 603 604 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 605 static void dump_object_array(DumpWriter* writer, objArrayOop array); 606 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 607 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 608 // create HPROF_FRAME record for the given method and bci 609 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, methodOop m, int bci); 610 }; 611 612 // write a header of the given type 613 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 614 writer->write_u1((u1)tag); 615 writer->write_u4(0); // current ticks 616 writer->write_u4(len); 617 } 618 619 // returns hprof tag for the given type signature 620 hprofTag DumperSupport::sig2tag(symbolOop sig) { 621 switch (sig->byte_at(0)) { 622 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 623 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 624 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 625 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 626 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 627 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 628 case JVM_SIGNATURE_INT : return HPROF_INT; 629 case JVM_SIGNATURE_LONG : return HPROF_LONG; 630 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 631 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 632 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 633 } 634 } 635 636 hprofTag DumperSupport::type2tag(BasicType type) { 637 switch (type) { 638 case T_BYTE : return HPROF_BYTE; 639 case T_CHAR : return HPROF_CHAR; 640 case T_FLOAT : return HPROF_FLOAT; 641 case T_DOUBLE : return HPROF_DOUBLE; 642 case T_INT : return HPROF_INT; 643 case T_LONG : return HPROF_LONG; 644 case T_SHORT : return HPROF_SHORT; 645 case T_BOOLEAN : return HPROF_BOOLEAN; 646 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 647 } 648 } 649 650 // dump a jfloat 651 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 652 if (g_isnan(f)) { 653 writer->write_u4(0x7fc00000); // collapsing NaNs 654 } else { 655 union { 656 int i; 657 float f; 658 } u; 659 u.f = (float)f; 660 writer->write_u4((u4)u.i); 661 } 662 } 663 664 // dump a jdouble 665 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 666 union { 667 jlong l; 668 double d; 669 } u; 670 if (g_isnan(d)) { // collapsing NaNs 671 u.l = (jlong)(0x7ff80000); 672 u.l = (u.l << 32); 673 } else { 674 u.d = (double)d; 675 } 676 writer->write_u8((u8)u.l); 677 } 678 679 // dumps the raw value of the given field 680 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 681 switch (type) { 682 case JVM_SIGNATURE_CLASS : 683 case JVM_SIGNATURE_ARRAY : { 684 oop o; 685 if (UseCompressedOops) { 686 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 687 } else { 688 o = oopDesc::load_decode_heap_oop((oop*)addr); 689 } 690 691 // reflection and sun.misc.Unsafe classes may have a reference to a 692 // klassOop so filter it out. 693 if (o != NULL && o->is_klass()) { 694 o = NULL; 695 } 696 697 // FIXME: When sharing is enabled we don't emit field references to objects 698 // in shared spaces. We can remove this once we write records for the classes 699 // and strings that are shared. 700 if (o != NULL && o->is_shared()) { 701 o = NULL; 702 } 703 writer->write_objectID(o); 704 break; 705 } 706 case JVM_SIGNATURE_BYTE : { 707 jbyte* b = (jbyte*)addr; 708 writer->write_u1((u1)*b); 709 break; 710 } 711 case JVM_SIGNATURE_CHAR : { 712 jchar* c = (jchar*)addr; 713 writer->write_u2((u2)*c); 714 break; 715 } 716 case JVM_SIGNATURE_SHORT : { 717 jshort* s = (jshort*)addr; 718 writer->write_u2((u2)*s); 719 break; 720 } 721 case JVM_SIGNATURE_FLOAT : { 722 jfloat* f = (jfloat*)addr; 723 dump_float(writer, *f); 724 break; 725 } 726 case JVM_SIGNATURE_DOUBLE : { 727 jdouble* f = (jdouble*)addr; 728 dump_double(writer, *f); 729 break; 730 } 731 case JVM_SIGNATURE_INT : { 732 jint* i = (jint*)addr; 733 writer->write_u4((u4)*i); 734 break; 735 } 736 case JVM_SIGNATURE_LONG : { 737 jlong* l = (jlong*)addr; 738 writer->write_u8((u8)*l); 739 break; 740 } 741 case JVM_SIGNATURE_BOOLEAN : { 742 jboolean* b = (jboolean*)addr; 743 writer->write_u1((u1)*b); 744 break; 745 } 746 default : ShouldNotReachHere(); 747 } 748 } 749 750 // returns the size of the instance of the given class 751 u4 DumperSupport::instance_size(klassOop k) { 752 HandleMark hm; 753 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 754 755 int size = 0; 756 757 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 758 if (!fld.access_flags().is_static()) { 759 symbolOop sig = fld.signature(); 760 switch (sig->byte_at(0)) { 761 case JVM_SIGNATURE_CLASS : 762 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 763 764 case JVM_SIGNATURE_BYTE : 765 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 766 767 case JVM_SIGNATURE_CHAR : 768 case JVM_SIGNATURE_SHORT : size += 2; break; 769 770 case JVM_SIGNATURE_INT : 771 case JVM_SIGNATURE_FLOAT : size += 4; break; 772 773 case JVM_SIGNATURE_LONG : 774 case JVM_SIGNATURE_DOUBLE : size += 8; break; 775 776 default : ShouldNotReachHere(); 777 } 778 } 779 } 780 return (u4)size; 781 } 782 783 // dumps static fields of the given class 784 void DumperSupport::dump_static_fields(DumpWriter* writer, klassOop k) { 785 HandleMark hm; 786 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 787 788 // pass 1 - count the static fields 789 u2 field_count = 0; 790 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 791 if (fldc.access_flags().is_static()) field_count++; 792 } 793 794 writer->write_u2(field_count); 795 796 // pass 2 - dump the field descriptors and raw values 797 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 798 if (fld.access_flags().is_static()) { 799 symbolOop sig = fld.signature(); 800 801 writer->write_objectID(fld.name()); // name 802 writer->write_u1(sig2tag(sig)); // type 803 804 // value 805 int offset = fld.offset(); 806 address addr = (address)k + offset; 807 808 dump_field_value(writer, sig->byte_at(0), addr); 809 } 810 } 811 } 812 813 // dump the raw values of the instance fields of the given object 814 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 815 HandleMark hm; 816 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 817 818 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 819 if (!fld.access_flags().is_static()) { 820 symbolOop sig = fld.signature(); 821 address addr = (address)o + fld.offset(); 822 823 dump_field_value(writer, sig->byte_at(0), addr); 824 } 825 } 826 } 827 828 // dumps the definition of the instance fields for a given class 829 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, klassOop k) { 830 HandleMark hm; 831 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 832 833 // pass 1 - count the instance fields 834 u2 field_count = 0; 835 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 836 if (!fldc.access_flags().is_static()) field_count++; 837 } 838 839 writer->write_u2(field_count); 840 841 // pass 2 - dump the field descriptors 842 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 843 if (!fld.access_flags().is_static()) { 844 symbolOop sig = fld.signature(); 845 846 writer->write_objectID(fld.name()); // name 847 writer->write_u1(sig2tag(sig)); // type 848 } 849 } 850 } 851 852 // creates HPROF_GC_INSTANCE_DUMP record for the given object 853 void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 854 klassOop k = o->klass(); 855 856 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 857 writer->write_objectID(o); 858 writer->write_u4(STACK_TRACE_ID); 859 860 // class ID 861 writer->write_classID(Klass::cast(k)); 862 863 // number of bytes that follow 864 writer->write_u4(instance_size(k) ); 865 866 // field values 867 dump_instance_fields(writer, o); 868 } 869 870 // creates HPROF_GC_CLASS_DUMP record for the given class and each of 871 // its array classes 872 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, klassOop k) { 873 Klass* klass = Klass::cast(k); 874 assert(klass->oop_is_instance(), "not an instanceKlass"); 875 instanceKlass* ik = (instanceKlass*)klass; 876 877 writer->write_u1(HPROF_GC_CLASS_DUMP); 878 879 // class ID 880 writer->write_classID(ik); 881 writer->write_u4(STACK_TRACE_ID); 882 883 // super class ID 884 klassOop java_super = ik->java_super(); 885 if (java_super == NULL) { 886 writer->write_objectID(NULL); 887 } else { 888 writer->write_classID(Klass::cast(java_super)); 889 } 890 891 writer->write_objectID(ik->class_loader()); 892 writer->write_objectID(ik->signers()); 893 writer->write_objectID(ik->protection_domain()); 894 895 // reserved 896 writer->write_objectID(NULL); 897 writer->write_objectID(NULL); 898 899 // instance size 900 writer->write_u4(DumperSupport::instance_size(k)); 901 902 // size of constant pool - ignored by HAT 1.1 903 writer->write_u2(0); 904 905 // number of static fields 906 dump_static_fields(writer, k); 907 908 // description of instance fields 909 dump_instance_field_descriptors(writer, k); 910 911 // array classes 912 k = klass->array_klass_or_null(); 913 while (k != NULL) { 914 Klass* klass = Klass::cast(k); 915 assert(klass->oop_is_objArray(), "not an objArrayKlass"); 916 917 writer->write_u1(HPROF_GC_CLASS_DUMP); 918 writer->write_classID(klass); 919 writer->write_u4(STACK_TRACE_ID); 920 921 // super class of array classes is java.lang.Object 922 java_super = klass->java_super(); 923 assert(java_super != NULL, "checking"); 924 writer->write_classID(Klass::cast(java_super)); 925 926 writer->write_objectID(ik->class_loader()); 927 writer->write_objectID(ik->signers()); 928 writer->write_objectID(ik->protection_domain()); 929 930 writer->write_objectID(NULL); // reserved 931 writer->write_objectID(NULL); 932 writer->write_u4(0); // instance size 933 writer->write_u2(0); // constant pool 934 writer->write_u2(0); // static fields 935 writer->write_u2(0); // instance fields 936 937 // get the array class for the next rank 938 k = klass->array_klass_or_null(); 939 } 940 } 941 942 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 943 // class (and each multi-dimensional array class too) 944 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, klassOop k) { 945 // array classes 946 while (k != NULL) { 947 Klass* klass = Klass::cast(k); 948 949 writer->write_u1(HPROF_GC_CLASS_DUMP); 950 writer->write_classID(klass); 951 writer->write_u4(STACK_TRACE_ID); 952 953 // super class of array classes is java.lang.Object 954 klassOop java_super = klass->java_super(); 955 assert(java_super != NULL, "checking"); 956 writer->write_classID(Klass::cast(java_super)); 957 958 writer->write_objectID(NULL); // loader 959 writer->write_objectID(NULL); // signers 960 writer->write_objectID(NULL); // protection domain 961 962 writer->write_objectID(NULL); // reserved 963 writer->write_objectID(NULL); 964 writer->write_u4(0); // instance size 965 writer->write_u2(0); // constant pool 966 writer->write_u2(0); // static fields 967 writer->write_u2(0); // instance fields 968 969 // get the array class for the next rank 970 k = klass->array_klass_or_null(); 971 } 972 } 973 974 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 975 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 976 977 // filter this 978 if (array->klass() == Universe::systemObjArrayKlassObj()) return; 979 980 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 981 writer->write_objectID(array); 982 writer->write_u4(STACK_TRACE_ID); 983 writer->write_u4((u4)array->length()); 984 985 // array class ID 986 writer->write_classID(Klass::cast(array->klass())); 987 988 // [id]* elements 989 for (int index=0; index<array->length(); index++) { 990 oop o = array->obj_at(index); 991 writer->write_objectID(o); 992 } 993 } 994 995 #define WRITE_ARRAY(Array, Type, Size) \ 996 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); } 997 998 999 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1000 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1001 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); 1002 1003 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1004 writer->write_objectID(array); 1005 writer->write_u4(STACK_TRACE_ID); 1006 writer->write_u4((u4)array->length()); 1007 writer->write_u1(type2tag(type)); 1008 1009 // nothing to copy 1010 if (array->length() == 0) { 1011 return; 1012 } 1013 1014 // If the byte ordering is big endian then we can copy most types directly 1015 int length_in_bytes = array->length() * type2aelembytes(type); 1016 assert(length_in_bytes > 0, "nothing to copy"); 1017 1018 switch (type) { 1019 case T_INT : { 1020 if (Bytes::is_Java_byte_ordering_different()) { 1021 WRITE_ARRAY(array, int, u4); 1022 } else { 1023 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1024 } 1025 break; 1026 } 1027 case T_BYTE : { 1028 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1029 break; 1030 } 1031 case T_CHAR : { 1032 if (Bytes::is_Java_byte_ordering_different()) { 1033 WRITE_ARRAY(array, char, u2); 1034 } else { 1035 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1036 } 1037 break; 1038 } 1039 case T_SHORT : { 1040 if (Bytes::is_Java_byte_ordering_different()) { 1041 WRITE_ARRAY(array, short, u2); 1042 } else { 1043 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1044 } 1045 break; 1046 } 1047 case T_BOOLEAN : { 1048 if (Bytes::is_Java_byte_ordering_different()) { 1049 WRITE_ARRAY(array, bool, u1); 1050 } else { 1051 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1052 } 1053 break; 1054 } 1055 case T_LONG : { 1056 if (Bytes::is_Java_byte_ordering_different()) { 1057 WRITE_ARRAY(array, long, u8); 1058 } else { 1059 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1060 } 1061 break; 1062 } 1063 1064 // handle float/doubles in a special value to ensure than NaNs are 1065 // written correctly. TO DO: Check if we can avoid this on processors that 1066 // use IEEE 754. 1067 1068 case T_FLOAT : { 1069 for (int i=0; i<array->length(); i++) { 1070 dump_float( writer, array->float_at(i) ); 1071 } 1072 break; 1073 } 1074 case T_DOUBLE : { 1075 for (int i=0; i<array->length(); i++) { 1076 dump_double( writer, array->double_at(i) ); 1077 } 1078 break; 1079 } 1080 default : ShouldNotReachHere(); 1081 } 1082 } 1083 1084 // create a HPROF_FRAME record of the given methodOop and bci 1085 void DumperSupport::dump_stack_frame(DumpWriter* writer, 1086 int frame_serial_num, 1087 int class_serial_num, 1088 methodOop m, 1089 int bci) { 1090 int line_number; 1091 if (m->is_native()) { 1092 line_number = -3; // native frame 1093 } else { 1094 line_number = m->line_number_from_bci(bci); 1095 } 1096 1097 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1098 writer->write_id(frame_serial_num); // frame serial number 1099 writer->write_objectID(m->name()); // method's name 1100 writer->write_objectID(m->signature()); // method's signature 1101 1102 assert(Klass::cast(m->method_holder())->oop_is_instance(), "not instanceKlass"); 1103 writer->write_objectID(instanceKlass::cast(m->method_holder())->source_file_name()); // source file name 1104 writer->write_u4(class_serial_num); // class serial number 1105 writer->write_u4((u4) line_number); // line number 1106 } 1107 1108 // Support class used to generate HPROF_UTF8 records from the entries in the 1109 // SymbolTable. 1110 1111 class SymbolTableDumper : public OopClosure { 1112 private: 1113 DumpWriter* _writer; 1114 DumpWriter* writer() const { return _writer; } 1115 public: 1116 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1117 void do_oop(oop* obj_p); 1118 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1119 }; 1120 1121 void SymbolTableDumper::do_oop(oop* obj_p) { 1122 ResourceMark rm; 1123 symbolOop sym = (symbolOop)*obj_p; 1124 1125 int len = sym->utf8_length(); 1126 if (len > 0) { 1127 char* s = sym->as_utf8(); 1128 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1129 writer()->write_objectID(sym); 1130 writer()->write_raw(s, len); 1131 } 1132 } 1133 1134 1135 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1136 1137 class JNILocalsDumper : public OopClosure { 1138 private: 1139 DumpWriter* _writer; 1140 u4 _thread_serial_num; 1141 int _frame_num; 1142 DumpWriter* writer() const { return _writer; } 1143 public: 1144 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1145 _writer = writer; 1146 _thread_serial_num = thread_serial_num; 1147 _frame_num = -1; // default - empty stack 1148 } 1149 void set_frame_number(int n) { _frame_num = n; } 1150 void do_oop(oop* obj_p); 1151 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1152 }; 1153 1154 1155 void JNILocalsDumper::do_oop(oop* obj_p) { 1156 // ignore null or deleted handles 1157 oop o = *obj_p; 1158 if (o != NULL && o != JNIHandles::deleted_handle()) { 1159 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1160 writer()->write_objectID(o); 1161 writer()->write_u4(_thread_serial_num); 1162 writer()->write_u4((u4)_frame_num); 1163 } 1164 } 1165 1166 1167 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1168 1169 class JNIGlobalsDumper : public OopClosure { 1170 private: 1171 DumpWriter* _writer; 1172 DumpWriter* writer() const { return _writer; } 1173 1174 public: 1175 JNIGlobalsDumper(DumpWriter* writer) { 1176 _writer = writer; 1177 } 1178 void do_oop(oop* obj_p); 1179 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1180 }; 1181 1182 void JNIGlobalsDumper::do_oop(oop* obj_p) { 1183 oop o = *obj_p; 1184 1185 // ignore these 1186 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1187 1188 // we ignore global ref to symbols and other internal objects 1189 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1190 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1191 writer()->write_objectID(o); 1192 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1193 } 1194 }; 1195 1196 1197 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1198 1199 class MonitorUsedDumper : public OopClosure { 1200 private: 1201 DumpWriter* _writer; 1202 DumpWriter* writer() const { return _writer; } 1203 public: 1204 MonitorUsedDumper(DumpWriter* writer) { 1205 _writer = writer; 1206 } 1207 void do_oop(oop* obj_p) { 1208 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1209 writer()->write_objectID(*obj_p); 1210 } 1211 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1212 }; 1213 1214 1215 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1216 1217 class StickyClassDumper : public OopClosure { 1218 private: 1219 DumpWriter* _writer; 1220 DumpWriter* writer() const { return _writer; } 1221 public: 1222 StickyClassDumper(DumpWriter* writer) { 1223 _writer = writer; 1224 } 1225 void do_oop(oop* obj_p); 1226 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1227 }; 1228 1229 void StickyClassDumper::do_oop(oop* obj_p) { 1230 if (*obj_p != NULL) { 1231 oop o = *obj_p; 1232 if (o->is_klass()) { 1233 klassOop k = klassOop(o); 1234 if (Klass::cast(k)->oop_is_instance()) { 1235 instanceKlass* ik = instanceKlass::cast(k); 1236 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1237 writer()->write_classID(ik); 1238 } 1239 } 1240 } 1241 } 1242 1243 1244 class VM_HeapDumper; 1245 1246 // Support class using when iterating over the heap. 1247 1248 class HeapObjectDumper : public ObjectClosure { 1249 private: 1250 VM_HeapDumper* _dumper; 1251 DumpWriter* _writer; 1252 1253 VM_HeapDumper* dumper() { return _dumper; } 1254 DumpWriter* writer() { return _writer; } 1255 1256 // used to indicate that a record has been writen 1257 void mark_end_of_record(); 1258 1259 public: 1260 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1261 _dumper = dumper; 1262 _writer = writer; 1263 } 1264 1265 // called for each object in the heap 1266 void do_object(oop o); 1267 }; 1268 1269 void HeapObjectDumper::do_object(oop o) { 1270 // hide the sentinel for deleted handles 1271 if (o == JNIHandles::deleted_handle()) return; 1272 1273 // ignore KlassKlass objects 1274 if (o->is_klass()) return; 1275 1276 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1277 if (o->klass() == SystemDictionary::Class_klass()) { 1278 if (!java_lang_Class::is_primitive(o)) { 1279 return; 1280 } 1281 } 1282 1283 // create a HPROF_GC_INSTANCE record for each object 1284 if (o->is_instance()) { 1285 DumperSupport::dump_instance(writer(), o); 1286 mark_end_of_record(); 1287 } else { 1288 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1289 if (o->is_objArray()) { 1290 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1291 mark_end_of_record(); 1292 } else { 1293 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1294 if (o->is_typeArray()) { 1295 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1296 mark_end_of_record(); 1297 } 1298 } 1299 } 1300 } 1301 1302 // The VM operation that performs the heap dump 1303 class VM_HeapDumper : public VM_GC_Operation { 1304 private: 1305 static VM_HeapDumper* _global_dumper; 1306 static DumpWriter* _global_writer; 1307 DumpWriter* _local_writer; 1308 JavaThread* _oome_thread; 1309 methodOop _oome_constructor; 1310 bool _gc_before_heap_dump; 1311 bool _is_segmented_dump; 1312 jlong _dump_start; 1313 GrowableArray<Klass*>* _klass_map; 1314 ThreadStackTrace** _stack_traces; 1315 int _num_threads; 1316 1317 // accessors and setters 1318 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1319 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1320 void set_global_dumper() { 1321 assert(_global_dumper == NULL, "Error"); 1322 _global_dumper = this; 1323 } 1324 void set_global_writer() { 1325 assert(_global_writer == NULL, "Error"); 1326 _global_writer = _local_writer; 1327 } 1328 void clear_global_dumper() { _global_dumper = NULL; } 1329 void clear_global_writer() { _global_writer = NULL; } 1330 1331 bool is_segmented_dump() const { return _is_segmented_dump; } 1332 void set_segmented_dump() { _is_segmented_dump = true; } 1333 jlong dump_start() const { return _dump_start; } 1334 void set_dump_start(jlong pos); 1335 1336 bool skip_operation() const; 1337 1338 // writes a HPROF_LOAD_CLASS record 1339 static void do_load_class(klassOop k); 1340 1341 // writes a HPROF_GC_CLASS_DUMP record for the given class 1342 // (and each array class too) 1343 static void do_class_dump(klassOop k); 1344 1345 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1346 // array (and each multi-dimensional array too) 1347 static void do_basic_type_array_class_dump(klassOop k); 1348 1349 // HPROF_GC_ROOT_THREAD_OBJ records 1350 int do_thread(JavaThread* thread, u4 thread_serial_num); 1351 void do_threads(); 1352 1353 void add_class_serial_number(Klass* k, int serial_num) { 1354 _klass_map->at_put_grow(serial_num, k); 1355 } 1356 1357 // HPROF_TRACE and HPROF_FRAME records 1358 void dump_stack_traces(); 1359 1360 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1361 void write_dump_header(); 1362 1363 // fixes up the length of the current dump record 1364 void write_current_dump_record_length(); 1365 1366 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1367 // record in the case of a segmented heap dump) 1368 void end_of_dump(); 1369 1370 public: 1371 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1372 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1373 0 /* total full collections, dummy, ignored */, 1374 gc_before_heap_dump) { 1375 _local_writer = writer; 1376 _gc_before_heap_dump = gc_before_heap_dump; 1377 _is_segmented_dump = false; 1378 _dump_start = (jlong)-1; 1379 _klass_map = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1380 _stack_traces = NULL; 1381 _num_threads = 0; 1382 if (oome) { 1383 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1384 // get OutOfMemoryError zero-parameter constructor 1385 instanceKlass* oome_ik = instanceKlass::cast(SystemDictionary::OutOfMemoryError_klass()); 1386 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1387 vmSymbols::void_method_signature()); 1388 // get thread throwing OOME when generating the heap dump at OOME 1389 _oome_thread = JavaThread::current(); 1390 } else { 1391 _oome_thread = NULL; 1392 _oome_constructor = NULL; 1393 } 1394 } 1395 ~VM_HeapDumper() { 1396 if (_stack_traces != NULL) { 1397 for (int i=0; i < _num_threads; i++) { 1398 delete _stack_traces[i]; 1399 } 1400 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces); 1401 } 1402 delete _klass_map; 1403 } 1404 1405 VMOp_Type type() const { return VMOp_HeapDumper; } 1406 // used to mark sub-record boundary 1407 void check_segment_length(); 1408 void doit(); 1409 }; 1410 1411 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1412 DumpWriter* VM_HeapDumper::_global_writer = NULL; 1413 1414 bool VM_HeapDumper::skip_operation() const { 1415 return false; 1416 } 1417 1418 // sets the dump starting position 1419 void VM_HeapDumper::set_dump_start(jlong pos) { 1420 _dump_start = pos; 1421 } 1422 1423 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1424 void VM_HeapDumper::write_dump_header() { 1425 if (writer()->is_open()) { 1426 if (is_segmented_dump()) { 1427 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1428 } else { 1429 writer()->write_u1(HPROF_HEAP_DUMP); 1430 } 1431 writer()->write_u4(0); // current ticks 1432 1433 // record the starting position for the dump (its length will be fixed up later) 1434 set_dump_start(writer()->current_offset()); 1435 writer()->write_u4(0); 1436 } 1437 } 1438 1439 // fixes up the length of the current dump record 1440 void VM_HeapDumper::write_current_dump_record_length() { 1441 if (writer()->is_open()) { 1442 assert(dump_start() >= 0, "no dump start recorded"); 1443 1444 // calculate the size of the dump record 1445 jlong dump_end = writer()->current_offset(); 1446 jlong dump_len = (dump_end - dump_start() - 4); 1447 1448 // record length must fit in a u4 1449 if (dump_len > (jlong)(4L*(jlong)G)) { 1450 warning("record is too large"); 1451 } 1452 1453 // seek to the dump start and fix-up the length 1454 writer()->seek_to_offset(dump_start()); 1455 writer()->write_u4((u4)dump_len); 1456 1457 // adjust the total size written to keep the bytes written correct. 1458 writer()->adjust_bytes_written(-((long) sizeof(u4))); 1459 1460 // seek to dump end so we can continue 1461 writer()->seek_to_offset(dump_end); 1462 1463 // no current dump record 1464 set_dump_start((jlong)-1); 1465 } 1466 } 1467 1468 // used on a sub-record boundary to check if we need to start a 1469 // new segment. 1470 void VM_HeapDumper::check_segment_length() { 1471 if (writer()->is_open()) { 1472 if (is_segmented_dump()) { 1473 // don't use current_offset that would be too expensive on a per record basis 1474 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten(); 1475 assert(dump_end == writer()->current_offset(), "checking"); 1476 jlong dump_len = (dump_end - dump_start() - 4); 1477 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length"); 1478 1479 if (dump_len > (jlong)HeapDumpSegmentSize) { 1480 write_current_dump_record_length(); 1481 write_dump_header(); 1482 } 1483 } 1484 } 1485 } 1486 1487 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1488 // record in the case of a segmented heap dump) 1489 void VM_HeapDumper::end_of_dump() { 1490 if (writer()->is_open()) { 1491 write_current_dump_record_length(); 1492 1493 // for segmented dump we write the end record 1494 if (is_segmented_dump()) { 1495 writer()->write_u1(HPROF_HEAP_DUMP_END); 1496 writer()->write_u4(0); 1497 writer()->write_u4(0); 1498 } 1499 } 1500 } 1501 1502 // marks sub-record boundary 1503 void HeapObjectDumper::mark_end_of_record() { 1504 dumper()->check_segment_length(); 1505 } 1506 1507 // writes a HPROF_LOAD_CLASS record for the class (and each of its 1508 // array classes) 1509 void VM_HeapDumper::do_load_class(klassOop k) { 1510 static u4 class_serial_num = 0; 1511 1512 // len of HPROF_LOAD_CLASS record 1513 u4 remaining = 2*oopSize + 2*sizeof(u4); 1514 1515 // write a HPROF_LOAD_CLASS for the class and each array class 1516 do { 1517 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1518 1519 // class serial number is just a number 1520 writer()->write_u4(++class_serial_num); 1521 1522 // class ID 1523 Klass* klass = Klass::cast(k); 1524 writer()->write_classID(klass); 1525 1526 // add the klassOop and class serial number pair 1527 dumper()->add_class_serial_number(klass, class_serial_num); 1528 1529 writer()->write_u4(STACK_TRACE_ID); 1530 1531 // class name ID 1532 symbolOop name = klass->name(); 1533 writer()->write_objectID(name); 1534 1535 // write a LOAD_CLASS record for the array type (if it exists) 1536 k = klass->array_klass_or_null(); 1537 } while (k != NULL); 1538 } 1539 1540 // writes a HPROF_GC_CLASS_DUMP record for the given class 1541 void VM_HeapDumper::do_class_dump(klassOop k) { 1542 DumperSupport::dump_class_and_array_classes(writer(), k); 1543 } 1544 1545 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1546 // array (and each multi-dimensional array too) 1547 void VM_HeapDumper::do_basic_type_array_class_dump(klassOop k) { 1548 DumperSupport::dump_basic_type_array_class(writer(), k); 1549 } 1550 1551 // Walk the stack of the given thread. 1552 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1553 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1554 // 1555 // It returns the number of Java frames in this thread stack 1556 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1557 JNILocalsDumper blk(writer(), thread_serial_num); 1558 1559 oop threadObj = java_thread->threadObj(); 1560 assert(threadObj != NULL, "sanity check"); 1561 1562 int stack_depth = 0; 1563 if (java_thread->has_last_Java_frame()) { 1564 1565 // vframes are resource allocated 1566 Thread* current_thread = Thread::current(); 1567 ResourceMark rm(current_thread); 1568 HandleMark hm(current_thread); 1569 1570 RegisterMap reg_map(java_thread); 1571 frame f = java_thread->last_frame(); 1572 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1573 frame* last_entry_frame = NULL; 1574 int extra_frames = 0; 1575 1576 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1577 extra_frames++; 1578 } 1579 while (vf != NULL) { 1580 blk.set_frame_number(stack_depth); 1581 if (vf->is_java_frame()) { 1582 1583 // java frame (interpreted, compiled, ...) 1584 javaVFrame *jvf = javaVFrame::cast(vf); 1585 if (!(jvf->method()->is_native())) { 1586 StackValueCollection* locals = jvf->locals(); 1587 for (int slot=0; slot<locals->size(); slot++) { 1588 if (locals->at(slot)->type() == T_OBJECT) { 1589 oop o = locals->obj_at(slot)(); 1590 1591 if (o != NULL) { 1592 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1593 writer()->write_objectID(o); 1594 writer()->write_u4(thread_serial_num); 1595 writer()->write_u4((u4) (stack_depth + extra_frames)); 1596 } 1597 } 1598 } 1599 } else { 1600 // native frame 1601 if (stack_depth == 0) { 1602 // JNI locals for the top frame. 1603 java_thread->active_handles()->oops_do(&blk); 1604 } else { 1605 if (last_entry_frame != NULL) { 1606 // JNI locals for the entry frame 1607 assert(last_entry_frame->is_entry_frame(), "checking"); 1608 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1609 } 1610 } 1611 } 1612 // increment only for Java frames 1613 stack_depth++; 1614 last_entry_frame = NULL; 1615 1616 } else { 1617 // externalVFrame - if it's an entry frame then report any JNI locals 1618 // as roots when we find the corresponding native javaVFrame 1619 frame* fr = vf->frame_pointer(); 1620 assert(fr != NULL, "sanity check"); 1621 if (fr->is_entry_frame()) { 1622 last_entry_frame = fr; 1623 } 1624 } 1625 vf = vf->sender(); 1626 } 1627 } else { 1628 // no last java frame but there may be JNI locals 1629 java_thread->active_handles()->oops_do(&blk); 1630 } 1631 return stack_depth; 1632 } 1633 1634 1635 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1636 // the stack so that locals and JNI locals are dumped. 1637 void VM_HeapDumper::do_threads() { 1638 for (int i=0; i < _num_threads; i++) { 1639 JavaThread* thread = _stack_traces[i]->thread(); 1640 oop threadObj = thread->threadObj(); 1641 u4 thread_serial_num = i+1; 1642 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1643 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1644 writer()->write_objectID(threadObj); 1645 writer()->write_u4(thread_serial_num); // thread number 1646 writer()->write_u4(stack_serial_num); // stack trace serial number 1647 int num_frames = do_thread(thread, thread_serial_num); 1648 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1649 "total number of Java frames not matched"); 1650 } 1651 } 1652 1653 1654 // The VM operation that dumps the heap. The dump consists of the following 1655 // records: 1656 // 1657 // HPROF_HEADER 1658 // [HPROF_UTF8]* 1659 // [HPROF_LOAD_CLASS]* 1660 // [[HPROF_FRAME]*|HPROF_TRACE]* 1661 // [HPROF_GC_CLASS_DUMP]* 1662 // HPROF_HEAP_DUMP 1663 // 1664 // The HPROF_TRACE records represent the stack traces where the heap dump 1665 // is generated and a "dummy trace" record which does not include 1666 // any frames. The dummy trace record is used to be referenced as the 1667 // unknown object alloc site. 1668 // 1669 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow 1670 // the heap dump be generated in a single pass we remember the position of 1671 // the dump length and fix it up after all sub-records have been written. 1672 // To generate the sub-records we iterate over the heap, writing 1673 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1674 // records as we go. Once that is done we write records for some of the GC 1675 // roots. 1676 1677 void VM_HeapDumper::doit() { 1678 1679 HandleMark hm; 1680 CollectedHeap* ch = Universe::heap(); 1681 if (_gc_before_heap_dump) { 1682 ch->collect_as_vm_thread(GCCause::_heap_dump); 1683 } else { 1684 // make the heap parsable (no need to retire TLABs) 1685 ch->ensure_parsability(false); 1686 } 1687 1688 // At this point we should be the only dumper active, so 1689 // the following should be safe. 1690 set_global_dumper(); 1691 set_global_writer(); 1692 1693 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1 1694 size_t used = ch->used(); 1695 const char* header; 1696 if (used > (size_t)SegmentedHeapDumpThreshold) { 1697 set_segmented_dump(); 1698 header = "JAVA PROFILE 1.0.2"; 1699 } else { 1700 header = "JAVA PROFILE 1.0.1"; 1701 } 1702 1703 // header is few bytes long - no chance to overflow int 1704 writer()->write_raw((void*)header, (int)strlen(header)); 1705 writer()->write_u1(0); // terminator 1706 writer()->write_u4(oopSize); 1707 writer()->write_u8(os::javaTimeMillis()); 1708 1709 // HPROF_UTF8 records 1710 SymbolTableDumper sym_dumper(writer()); 1711 SymbolTable::oops_do(&sym_dumper); 1712 1713 // write HPROF_LOAD_CLASS records 1714 SystemDictionary::classes_do(&do_load_class); 1715 Universe::basic_type_classes_do(&do_load_class); 1716 1717 // write HPROF_FRAME and HPROF_TRACE records 1718 // this must be called after _klass_map is built when iterating the classes above. 1719 dump_stack_traces(); 1720 1721 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT 1722 write_dump_header(); 1723 1724 // Writes HPROF_GC_CLASS_DUMP records 1725 SystemDictionary::classes_do(&do_class_dump); 1726 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1727 check_segment_length(); 1728 1729 // writes HPROF_GC_INSTANCE_DUMP records. 1730 // After each sub-record is written check_segment_length will be invoked. When 1731 // generated a segmented heap dump this allows us to check if the current 1732 // segment exceeds a threshold and if so, then a new segment is started. 1733 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1734 // of the heap dump. 1735 HeapObjectDumper obj_dumper(this, writer()); 1736 Universe::heap()->safe_object_iterate(&obj_dumper); 1737 1738 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1739 do_threads(); 1740 check_segment_length(); 1741 1742 // HPROF_GC_ROOT_MONITOR_USED 1743 MonitorUsedDumper mon_dumper(writer()); 1744 ObjectSynchronizer::oops_do(&mon_dumper); 1745 check_segment_length(); 1746 1747 // HPROF_GC_ROOT_JNI_GLOBAL 1748 JNIGlobalsDumper jni_dumper(writer()); 1749 JNIHandles::oops_do(&jni_dumper); 1750 check_segment_length(); 1751 1752 // HPROF_GC_ROOT_STICKY_CLASS 1753 StickyClassDumper class_dumper(writer()); 1754 SystemDictionary::always_strong_oops_do(&class_dumper); 1755 1756 // fixes up the length of the dump record. In the case of a segmented 1757 // heap then the HPROF_HEAP_DUMP_END record is also written. 1758 end_of_dump(); 1759 1760 // Now we clear the global variables, so that a future dumper might run. 1761 clear_global_dumper(); 1762 clear_global_writer(); 1763 } 1764 1765 void VM_HeapDumper::dump_stack_traces() { 1766 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1767 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1768 writer()->write_u4((u4) STACK_TRACE_ID); 1769 writer()->write_u4(0); // thread number 1770 writer()->write_u4(0); // frame count 1771 1772 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads()); 1773 int frame_serial_num = 0; 1774 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1775 oop threadObj = thread->threadObj(); 1776 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1777 // dump thread stack trace 1778 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1779 stack_trace->dump_stack_at_safepoint(-1); 1780 _stack_traces[_num_threads++] = stack_trace; 1781 1782 // write HPROF_FRAME records for this thread's stack trace 1783 int depth = stack_trace->get_stack_depth(); 1784 int thread_frame_start = frame_serial_num; 1785 int extra_frames = 0; 1786 // write fake frame that makes it look like the thread, which caused OOME, 1787 // is in the OutOfMemoryError zero-parameter constructor 1788 if (thread == _oome_thread && _oome_constructor != NULL) { 1789 int oome_serial_num = _klass_map->find(Klass::cast(_oome_constructor->method_holder())); 1790 // the class serial number starts from 1 1791 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1792 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1793 _oome_constructor, 0); 1794 extra_frames++; 1795 } 1796 for (int j=0; j < depth; j++) { 1797 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1798 methodOop m = frame->method(); 1799 int class_serial_num = _klass_map->find(Klass::cast(m->method_holder())); 1800 // the class serial number starts from 1 1801 assert(class_serial_num > 0, "class not found"); 1802 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1803 } 1804 depth += extra_frames; 1805 1806 // write HPROF_TRACE record for one thread 1807 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1808 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1809 writer()->write_u4(stack_serial_num); // stack trace serial number 1810 writer()->write_u4((u4) _num_threads); // thread serial number 1811 writer()->write_u4(depth); // frame count 1812 for (int j=1; j <= depth; j++) { 1813 writer()->write_id(thread_frame_start + j); 1814 } 1815 } 1816 } 1817 } 1818 1819 // dump the heap to given path. 1820 int HeapDumper::dump(const char* path) { 1821 assert(path != NULL && strlen(path) > 0, "path missing"); 1822 1823 // print message in interactive case 1824 if (print_to_tty()) { 1825 tty->print_cr("Dumping heap to %s ...", path); 1826 timer()->start(); 1827 } 1828 1829 // create the dump writer. If the file can be opened then bail 1830 DumpWriter writer(path); 1831 if (!writer.is_open()) { 1832 set_error(writer.error()); 1833 if (print_to_tty()) { 1834 tty->print_cr("Unable to create %s: %s", path, 1835 (error() != NULL) ? error() : "reason unknown"); 1836 } 1837 return -1; 1838 } 1839 1840 // generate the dump 1841 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1842 if (Thread::current()->is_VM_thread()) { 1843 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1844 dumper.doit(); 1845 } else { 1846 VMThread::execute(&dumper); 1847 } 1848 1849 // close dump file and record any error that the writer may have encountered 1850 writer.close(); 1851 set_error(writer.error()); 1852 1853 // print message in interactive case 1854 if (print_to_tty()) { 1855 timer()->stop(); 1856 if (error() == NULL) { 1857 char msg[256]; 1858 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]", 1859 os::jlong_format_specifier(), timer()->seconds()); 1860 tty->print_cr(msg, writer.bytes_written()); 1861 } else { 1862 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1863 } 1864 } 1865 1866 return (writer.error() == NULL) ? 0 : -1; 1867 } 1868 1869 // stop timer (if still active), and free any error string we might be holding 1870 HeapDumper::~HeapDumper() { 1871 if (timer()->is_active()) { 1872 timer()->stop(); 1873 } 1874 set_error(NULL); 1875 } 1876 1877 1878 // returns the error string (resource allocated), or NULL 1879 char* HeapDumper::error_as_C_string() const { 1880 if (error() != NULL) { 1881 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1882 strcpy(str, error()); 1883 return str; 1884 } else { 1885 return NULL; 1886 } 1887 } 1888 1889 // set the error string 1890 void HeapDumper::set_error(char* error) { 1891 if (_error != NULL) { 1892 os::free(_error); 1893 } 1894 if (error == NULL) { 1895 _error = NULL; 1896 } else { 1897 _error = os::strdup(error); 1898 assert(_error != NULL, "allocation failure"); 1899 } 1900 } 1901 1902 // Called by out-of-memory error reporting by a single Java thread 1903 // outside of a JVM safepoint 1904 void HeapDumper::dump_heap_from_oome() { 1905 HeapDumper::dump_heap(true); 1906 } 1907 1908 // Called by error reporting by a single Java thread outside of a JVM safepoint, 1909 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1910 // callers are strictly serialized and guaranteed not to interfere below. For more 1911 // general use, however, this method will need modification to prevent 1912 // inteference when updating the static variables base_path and dump_file_seq below. 1913 void HeapDumper::dump_heap() { 1914 HeapDumper::dump_heap(false); 1915 } 1916 1917 void HeapDumper::dump_heap(bool oome) { 1918 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1919 static uint dump_file_seq = 0; 1920 char my_path[JVM_MAXPATHLEN] = {'\0'}; 1921 1922 // The dump file defaults to java_pid<pid>.hprof in the current working 1923 // directory. HeapDumpPath=<file> can be used to specify an alternative 1924 // dump file name or a directory where dump file is created. 1925 if (dump_file_seq == 0) { // first time in, we initialize base_path 1926 bool use_default_filename = true; 1927 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 1928 // HeapDumpPath=<file> not specified 1929 } else { 1930 assert(strlen(HeapDumpPath) < sizeof(base_path), "HeapDumpPath too long"); 1931 strcpy(base_path, HeapDumpPath); 1932 // check if the path is a directory (must exist) 1933 DIR* dir = os::opendir(base_path); 1934 if (dir == NULL) { 1935 use_default_filename = false; 1936 } else { 1937 // HeapDumpPath specified a directory. We append a file separator 1938 // (if needed). 1939 os::closedir(dir); 1940 size_t fs_len = strlen(os::file_separator()); 1941 if (strlen(base_path) >= fs_len) { 1942 char* end = base_path; 1943 end += (strlen(base_path) - fs_len); 1944 if (strcmp(end, os::file_separator()) != 0) { 1945 assert(strlen(base_path) + strlen(os::file_separator()) < sizeof(base_path), 1946 "HeapDumpPath too long"); 1947 strcat(base_path, os::file_separator()); 1948 } 1949 } 1950 } 1951 } 1952 // If HeapDumpPath wasn't a file name then we append the default name 1953 if (use_default_filename) { 1954 char fn[32]; 1955 sprintf(fn, "java_pid%d", os::current_process_id()); 1956 assert(strlen(base_path) + strlen(fn) + strlen(".hprof") < sizeof(base_path), "HeapDumpPath too long"); 1957 strcat(base_path, fn); 1958 strcat(base_path, ".hprof"); 1959 } 1960 assert(strlen(base_path) < sizeof(my_path), "Buffer too small"); 1961 strcpy(my_path, base_path); 1962 } else { 1963 // Append a sequence number id for dumps following the first 1964 char fn[33]; 1965 sprintf(fn, ".%d", dump_file_seq); 1966 assert(strlen(base_path) + strlen(fn) < sizeof(my_path), "HeapDumpPath too long"); 1967 strcpy(my_path, base_path); 1968 strcat(my_path, fn); 1969 } 1970 dump_file_seq++; // increment seq number for next time we dump 1971 1972 HeapDumper dumper(false /* no GC before heap dump */, 1973 true /* send to tty */, 1974 oome /* pass along out-of-memory-error flag */); 1975 dumper.dump(my_path); 1976 }