1 /* 2 * Copyright (c) 2005, 2016, 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 "precompiled.hpp" 26 #include "classfile/symbolTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "gc/shared/gcLocker.inline.hpp" 30 #include "gc/shared/genCollectedHeap.hpp" 31 #include "gc/shared/vmGCOperations.hpp" 32 #include "memory/resourceArea.hpp" 33 #include "memory/universe.hpp" 34 #include "oops/objArrayKlass.hpp" 35 #include "oops/objArrayOop.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "runtime/javaCalls.hpp" 38 #include "runtime/jniHandles.hpp" 39 #include "runtime/os.hpp" 40 #include "runtime/reflectionUtils.hpp" 41 #include "runtime/vframe.hpp" 42 #include "runtime/vmThread.hpp" 43 #include "runtime/vm_operations.hpp" 44 #include "services/heapDumper.hpp" 45 #include "services/threadService.hpp" 46 #include "utilities/macros.hpp" 47 #include "utilities/ostream.hpp" 48 #if INCLUDE_ALL_GCS 49 #include "gc/parallel/parallelScavengeHeap.hpp" 50 #endif // INCLUDE_ALL_GCS 51 52 /* 53 * HPROF binary format - description copied from: 54 * src/share/demo/jvmti/hprof/hprof_io.c 55 * 56 * 57 * header "JAVA PROFILE 1.0.2" (0-terminated) 58 * 59 * u4 size of identifiers. Identifiers are used to represent 60 * UTF8 strings, objects, stack traces, etc. They usually 61 * have the same size as host pointers. For example, on 62 * Solaris and Win32, the size is 4. 63 * u4 high word 64 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 65 * [record]* a sequence of records. 66 * 67 * 68 * Record format: 69 * 70 * u1 a TAG denoting the type of the record 71 * u4 number of *microseconds* since the time stamp in the 72 * header. (wraps around in a little more than an hour) 73 * u4 number of bytes *remaining* in the record. Note that 74 * this number excludes the tag and the length field itself. 75 * [u1]* BODY of the record (a sequence of bytes) 76 * 77 * 78 * The following TAGs are supported: 79 * 80 * TAG BODY notes 81 *---------------------------------------------------------- 82 * HPROF_UTF8 a UTF8-encoded name 83 * 84 * id name ID 85 * [u1]* UTF8 characters (no trailing zero) 86 * 87 * HPROF_LOAD_CLASS a newly loaded class 88 * 89 * u4 class serial number (> 0) 90 * id class object ID 91 * u4 stack trace serial number 92 * id class name ID 93 * 94 * HPROF_UNLOAD_CLASS an unloading class 95 * 96 * u4 class serial_number 97 * 98 * HPROF_FRAME a Java stack frame 99 * 100 * id stack frame ID 101 * id method name ID 102 * id method signature ID 103 * id source file name ID 104 * u4 class serial number 105 * i4 line number. >0: normal 106 * -1: unknown 107 * -2: compiled method 108 * -3: native method 109 * 110 * HPROF_TRACE a Java stack trace 111 * 112 * u4 stack trace serial number 113 * u4 thread serial number 114 * u4 number of frames 115 * [id]* stack frame IDs 116 * 117 * 118 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC 119 * 120 * u2 flags 0x0001: incremental vs. complete 121 * 0x0002: sorted by allocation vs. live 122 * 0x0004: whether to force a GC 123 * u4 cutoff ratio 124 * u4 total live bytes 125 * u4 total live instances 126 * u8 total bytes allocated 127 * u8 total instances allocated 128 * u4 number of sites that follow 129 * [u1 is_array: 0: normal object 130 * 2: object array 131 * 4: boolean array 132 * 5: char array 133 * 6: float array 134 * 7: double array 135 * 8: byte array 136 * 9: short array 137 * 10: int array 138 * 11: long array 139 * u4 class serial number (may be zero during startup) 140 * u4 stack trace serial number 141 * u4 number of bytes alive 142 * u4 number of instances alive 143 * u4 number of bytes allocated 144 * u4]* number of instance allocated 145 * 146 * HPROF_START_THREAD a newly started thread. 147 * 148 * u4 thread serial number (> 0) 149 * id thread object ID 150 * u4 stack trace serial number 151 * id thread name ID 152 * id thread group name ID 153 * id thread group parent name ID 154 * 155 * HPROF_END_THREAD a terminating thread. 156 * 157 * u4 thread serial number 158 * 159 * HPROF_HEAP_SUMMARY heap summary 160 * 161 * u4 total live bytes 162 * u4 total live instances 163 * u8 total bytes allocated 164 * u8 total instances allocated 165 * 166 * HPROF_HEAP_DUMP denote a heap dump 167 * 168 * [heap dump sub-records]* 169 * 170 * There are four kinds of heap dump sub-records: 171 * 172 * u1 sub-record type 173 * 174 * HPROF_GC_ROOT_UNKNOWN unknown root 175 * 176 * id object ID 177 * 178 * HPROF_GC_ROOT_THREAD_OBJ thread object 179 * 180 * id thread object ID (may be 0 for a 181 * thread newly attached through JNI) 182 * u4 thread sequence number 183 * u4 stack trace sequence number 184 * 185 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root 186 * 187 * id object ID 188 * id JNI global ref ID 189 * 190 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref 191 * 192 * id object ID 193 * u4 thread serial number 194 * u4 frame # in stack trace (-1 for empty) 195 * 196 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame 197 * 198 * id object ID 199 * u4 thread serial number 200 * u4 frame # in stack trace (-1 for empty) 201 * 202 * HPROF_GC_ROOT_NATIVE_STACK Native stack 203 * 204 * id object ID 205 * u4 thread serial number 206 * 207 * HPROF_GC_ROOT_STICKY_CLASS System class 208 * 209 * id object ID 210 * 211 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block 212 * 213 * id object ID 214 * u4 thread serial number 215 * 216 * HPROF_GC_ROOT_MONITOR_USED Busy monitor 217 * 218 * id object ID 219 * 220 * HPROF_GC_CLASS_DUMP dump of a class object 221 * 222 * id class object ID 223 * u4 stack trace serial number 224 * id super class object ID 225 * id class loader object ID 226 * id signers object ID 227 * id protection domain object ID 228 * id reserved 229 * id reserved 230 * 231 * u4 instance size (in bytes) 232 * 233 * u2 size of constant pool 234 * [u2, constant pool index, 235 * ty, type 236 * 2: object 237 * 4: boolean 238 * 5: char 239 * 6: float 240 * 7: double 241 * 8: byte 242 * 9: short 243 * 10: int 244 * 11: long 245 * vl]* and value 246 * 247 * u2 number of static fields 248 * [id, static field name, 249 * ty, type, 250 * vl]* and value 251 * 252 * u2 number of inst. fields (not inc. super) 253 * [id, instance field name, 254 * ty]* type 255 * 256 * HPROF_GC_INSTANCE_DUMP dump of a normal object 257 * 258 * id object ID 259 * u4 stack trace serial number 260 * id class object ID 261 * u4 number of bytes that follow 262 * [vl]* instance field values (class, followed 263 * by super, super's super ...) 264 * 265 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array 266 * 267 * id array object ID 268 * u4 stack trace serial number 269 * u4 number of elements 270 * id array class ID 271 * [id]* elements 272 * 273 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array 274 * 275 * id array object ID 276 * u4 stack trace serial number 277 * u4 number of elements 278 * u1 element type 279 * 4: boolean array 280 * 5: char array 281 * 6: float array 282 * 7: double array 283 * 8: byte array 284 * 9: short array 285 * 10: int array 286 * 11: long array 287 * [u1]* elements 288 * 289 * HPROF_CPU_SAMPLES a set of sample traces of running threads 290 * 291 * u4 total number of samples 292 * u4 # of traces 293 * [u4 # of samples 294 * u4]* stack trace serial number 295 * 296 * HPROF_CONTROL_SETTINGS the settings of on/off switches 297 * 298 * u4 0x00000001: alloc traces on/off 299 * 0x00000002: cpu sampling on/off 300 * u2 stack trace depth 301 * 302 * 303 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally 304 * be generated as a sequence of heap dump segments. This sequence is 305 * terminated by an end record. The additional tags allowed by format 306 * "JAVA PROFILE 1.0.2" are: 307 * 308 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment 309 * 310 * [heap dump sub-records]* 311 * The same sub-record types allowed by HPROF_HEAP_DUMP 312 * 313 * HPROF_HEAP_DUMP_END denotes the end of a heap dump 314 * 315 */ 316 317 318 // HPROF tags 319 320 typedef enum { 321 // top-level records 322 HPROF_UTF8 = 0x01, 323 HPROF_LOAD_CLASS = 0x02, 324 HPROF_UNLOAD_CLASS = 0x03, 325 HPROF_FRAME = 0x04, 326 HPROF_TRACE = 0x05, 327 HPROF_ALLOC_SITES = 0x06, 328 HPROF_HEAP_SUMMARY = 0x07, 329 HPROF_START_THREAD = 0x0A, 330 HPROF_END_THREAD = 0x0B, 331 HPROF_HEAP_DUMP = 0x0C, 332 HPROF_CPU_SAMPLES = 0x0D, 333 HPROF_CONTROL_SETTINGS = 0x0E, 334 335 // 1.0.2 record types 336 HPROF_HEAP_DUMP_SEGMENT = 0x1C, 337 HPROF_HEAP_DUMP_END = 0x2C, 338 339 // field types 340 HPROF_ARRAY_OBJECT = 0x01, 341 HPROF_NORMAL_OBJECT = 0x02, 342 HPROF_BOOLEAN = 0x04, 343 HPROF_CHAR = 0x05, 344 HPROF_FLOAT = 0x06, 345 HPROF_DOUBLE = 0x07, 346 HPROF_BYTE = 0x08, 347 HPROF_SHORT = 0x09, 348 HPROF_INT = 0x0A, 349 HPROF_LONG = 0x0B, 350 351 // data-dump sub-records 352 HPROF_GC_ROOT_UNKNOWN = 0xFF, 353 HPROF_GC_ROOT_JNI_GLOBAL = 0x01, 354 HPROF_GC_ROOT_JNI_LOCAL = 0x02, 355 HPROF_GC_ROOT_JAVA_FRAME = 0x03, 356 HPROF_GC_ROOT_NATIVE_STACK = 0x04, 357 HPROF_GC_ROOT_STICKY_CLASS = 0x05, 358 HPROF_GC_ROOT_THREAD_BLOCK = 0x06, 359 HPROF_GC_ROOT_MONITOR_USED = 0x07, 360 HPROF_GC_ROOT_THREAD_OBJ = 0x08, 361 HPROF_GC_CLASS_DUMP = 0x20, 362 HPROF_GC_INSTANCE_DUMP = 0x21, 363 HPROF_GC_OBJ_ARRAY_DUMP = 0x22, 364 HPROF_GC_PRIM_ARRAY_DUMP = 0x23 365 } hprofTag; 366 367 // Default stack trace ID (used for dummy HPROF_TRACE record) 368 enum { 369 STACK_TRACE_ID = 1, 370 INITIAL_CLASS_COUNT = 200 371 }; 372 373 // Supports I/O operations on a dump file 374 375 class DumpWriter : public StackObj { 376 private: 377 enum { 378 io_buffer_size = 8*M 379 }; 380 381 int _fd; // file descriptor (-1 if dump file not open) 382 julong _bytes_written; // number of byte written to dump file 383 384 char* _buffer; // internal buffer 385 size_t _size; 386 size_t _pos; 387 388 jlong _dump_start; 389 390 char* _error; // error message when I/O fails 391 392 void set_file_descriptor(int fd) { _fd = fd; } 393 int file_descriptor() const { return _fd; } 394 395 char* buffer() const { return _buffer; } 396 size_t buffer_size() const { return _size; } 397 size_t position() const { return _pos; } 398 void set_position(size_t pos) { _pos = pos; } 399 400 void set_error(const char* error) { _error = (char*)os::strdup(error); } 401 402 // all I/O go through this function 403 void write_internal(void* s, size_t len); 404 405 public: 406 DumpWriter(const char* path); 407 ~DumpWriter(); 408 409 void close(); 410 bool is_open() const { return file_descriptor() >= 0; } 411 void flush(); 412 413 jlong dump_start() const { return _dump_start; } 414 void set_dump_start(jlong pos); 415 julong current_record_length(); 416 417 // total number of bytes written to the disk 418 julong bytes_written() const { return _bytes_written; } 419 420 // adjust the number of bytes written to disk (used to keep the count 421 // of the number of bytes written in case of rewrites) 422 void adjust_bytes_written(jlong n) { _bytes_written += n; } 423 424 // number of (buffered) bytes as yet unwritten to the dump file 425 size_t bytes_unwritten() const { return position(); } 426 427 char* error() const { return _error; } 428 429 jlong current_offset(); 430 void seek_to_offset(jlong pos); 431 432 // writer functions 433 void write_raw(void* s, size_t len); 434 void write_u1(u1 x) { write_raw((void*)&x, 1); } 435 void write_u2(u2 x); 436 void write_u4(u4 x); 437 void write_u8(u8 x); 438 void write_objectID(oop o); 439 void write_symbolID(Symbol* o); 440 void write_classID(Klass* k); 441 void write_id(u4 x); 442 }; 443 444 DumpWriter::DumpWriter(const char* path) { 445 // try to allocate an I/O buffer of io_buffer_size. If there isn't 446 // sufficient memory then reduce size until we can allocate something. 447 _size = io_buffer_size; 448 do { 449 _buffer = (char*)os::malloc(_size, mtInternal); 450 if (_buffer == NULL) { 451 _size = _size >> 1; 452 } 453 } while (_buffer == NULL && _size > 0); 454 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 455 _pos = 0; 456 _error = NULL; 457 _bytes_written = 0L; 458 _dump_start = (jlong)-1; 459 _fd = os::create_binary_file(path, false); // don't replace existing file 460 461 // if the open failed we record the error 462 if (_fd < 0) { 463 _error = (char*)os::strdup(os::strerror(errno)); 464 } 465 } 466 467 DumpWriter::~DumpWriter() { 468 // flush and close dump file 469 if (is_open()) { 470 close(); 471 } 472 if (_buffer != NULL) os::free(_buffer); 473 if (_error != NULL) os::free(_error); 474 } 475 476 // closes dump file (if open) 477 void DumpWriter::close() { 478 // flush and close dump file 479 if (is_open()) { 480 flush(); 481 os::close(file_descriptor()); 482 set_file_descriptor(-1); 483 } 484 } 485 486 // sets the dump starting position 487 void DumpWriter::set_dump_start(jlong pos) { 488 _dump_start = pos; 489 } 490 491 julong DumpWriter::current_record_length() { 492 if (is_open()) { 493 // calculate the size of the dump record 494 julong dump_end = bytes_written() + bytes_unwritten(); 495 assert(dump_end == (size_t)current_offset(), "checking"); 496 julong dump_len = dump_end - dump_start() - 4; 497 return dump_len; 498 } 499 return 0; 500 } 501 502 // write directly to the file 503 void DumpWriter::write_internal(void* s, size_t len) { 504 if (is_open()) { 505 const char* pos = (char*)s; 506 ssize_t n = 0; 507 while (len > 0) { 508 uint tmp = (uint)MIN2(len, (size_t)UINT_MAX); 509 n = os::write(file_descriptor(), pos, tmp); 510 511 if (n < 0) { 512 // EINTR cannot happen here, os::write will take care of that 513 set_error(os::strerror(errno)); 514 os::close(file_descriptor()); 515 set_file_descriptor(-1); 516 return; 517 } 518 519 _bytes_written += n; 520 pos += n; 521 len -= n; 522 } 523 } 524 } 525 526 // write raw bytes 527 void DumpWriter::write_raw(void* s, size_t len) { 528 if (is_open()) { 529 // flush buffer to make room 530 if ((position() + len) >= buffer_size()) { 531 flush(); 532 } 533 534 // buffer not available or too big to buffer it 535 if ((buffer() == NULL) || (len >= buffer_size())) { 536 write_internal(s, len); 537 } else { 538 // Should optimize this for u1/u2/u4/u8 sizes. 539 memcpy(buffer() + position(), s, len); 540 set_position(position() + len); 541 } 542 } 543 } 544 545 // flush any buffered bytes to the file 546 void DumpWriter::flush() { 547 if (is_open() && position() > 0) { 548 write_internal(buffer(), position()); 549 set_position(0); 550 } 551 } 552 553 jlong DumpWriter::current_offset() { 554 if (is_open()) { 555 // the offset is the file offset plus whatever we have buffered 556 jlong offset = os::current_file_offset(file_descriptor()); 557 assert(offset >= 0, "lseek failed"); 558 return offset + position(); 559 } else { 560 return (jlong)-1; 561 } 562 } 563 564 void DumpWriter::seek_to_offset(jlong off) { 565 assert(off >= 0, "bad offset"); 566 567 // need to flush before seeking 568 flush(); 569 570 // may be closed due to I/O error 571 if (is_open()) { 572 jlong n = os::seek_to_file_offset(file_descriptor(), off); 573 assert(n >= 0, "lseek failed"); 574 } 575 } 576 577 void DumpWriter::write_u2(u2 x) { 578 u2 v; 579 Bytes::put_Java_u2((address)&v, x); 580 write_raw((void*)&v, 2); 581 } 582 583 void DumpWriter::write_u4(u4 x) { 584 u4 v; 585 Bytes::put_Java_u4((address)&v, x); 586 write_raw((void*)&v, 4); 587 } 588 589 void DumpWriter::write_u8(u8 x) { 590 u8 v; 591 Bytes::put_Java_u8((address)&v, x); 592 write_raw((void*)&v, 8); 593 } 594 595 void DumpWriter::write_objectID(oop o) { 596 address a = (address)o; 597 #ifdef _LP64 598 write_u8((u8)a); 599 #else 600 write_u4((u4)a); 601 #endif 602 } 603 604 void DumpWriter::write_symbolID(Symbol* s) { 605 address a = (address)((uintptr_t)s); 606 #ifdef _LP64 607 write_u8((u8)a); 608 #else 609 write_u4((u4)a); 610 #endif 611 } 612 613 void DumpWriter::write_id(u4 x) { 614 #ifdef _LP64 615 write_u8((u8) x); 616 #else 617 write_u4(x); 618 #endif 619 } 620 621 // We use java mirror as the class ID 622 void DumpWriter::write_classID(Klass* k) { 623 write_objectID(k->java_mirror()); 624 } 625 626 627 628 // Support class with a collection of functions used when dumping the heap 629 630 class DumperSupport : AllStatic { 631 public: 632 633 // write a header of the given type 634 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 635 636 // returns hprof tag for the given type signature 637 static hprofTag sig2tag(Symbol* sig); 638 // returns hprof tag for the given basic type 639 static hprofTag type2tag(BasicType type); 640 641 // returns the size of the instance of the given class 642 static u4 instance_size(Klass* k); 643 644 // dump a jfloat 645 static void dump_float(DumpWriter* writer, jfloat f); 646 // dump a jdouble 647 static void dump_double(DumpWriter* writer, jdouble d); 648 // dumps the raw value of the given field 649 static void dump_field_value(DumpWriter* writer, char type, address addr); 650 // dumps static fields of the given class 651 static void dump_static_fields(DumpWriter* writer, Klass* k); 652 // dump the raw values of the instance fields of the given object 653 static void dump_instance_fields(DumpWriter* writer, oop o); 654 // dumps the definition of the instance fields for a given class 655 static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k); 656 // creates HPROF_GC_INSTANCE_DUMP record for the given object 657 static void dump_instance(DumpWriter* writer, oop o); 658 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 659 // array classes 660 static void dump_class_and_array_classes(DumpWriter* writer, Klass* k); 661 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 662 // class (and each multi-dimensional array class too) 663 static void dump_basic_type_array_class(DumpWriter* writer, Klass* k); 664 665 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 666 static void dump_object_array(DumpWriter* writer, objArrayOop array); 667 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 668 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 669 // create HPROF_FRAME record for the given method and bci 670 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci); 671 672 // check if we need to truncate an array 673 static int calculate_array_max_length(DumpWriter* writer, arrayOop array, short header_size); 674 675 // writes a HPROF_HEAP_DUMP_SEGMENT record 676 static void write_dump_header(DumpWriter* writer); 677 678 // fixes up the length of the current dump record 679 static void write_current_dump_record_length(DumpWriter* writer); 680 681 // fixes up the current dump record and writes HPROF_HEAP_DUMP_END record 682 static void end_of_dump(DumpWriter* writer); 683 }; 684 685 // write a header of the given type 686 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 687 writer->write_u1((u1)tag); 688 writer->write_u4(0); // current ticks 689 writer->write_u4(len); 690 } 691 692 // returns hprof tag for the given type signature 693 hprofTag DumperSupport::sig2tag(Symbol* sig) { 694 switch (sig->byte_at(0)) { 695 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 696 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 697 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 698 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 699 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 700 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 701 case JVM_SIGNATURE_INT : return HPROF_INT; 702 case JVM_SIGNATURE_LONG : return HPROF_LONG; 703 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 704 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 705 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 706 } 707 } 708 709 hprofTag DumperSupport::type2tag(BasicType type) { 710 switch (type) { 711 case T_BYTE : return HPROF_BYTE; 712 case T_CHAR : return HPROF_CHAR; 713 case T_FLOAT : return HPROF_FLOAT; 714 case T_DOUBLE : return HPROF_DOUBLE; 715 case T_INT : return HPROF_INT; 716 case T_LONG : return HPROF_LONG; 717 case T_SHORT : return HPROF_SHORT; 718 case T_BOOLEAN : return HPROF_BOOLEAN; 719 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 720 } 721 } 722 723 // dump a jfloat 724 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 725 if (g_isnan(f)) { 726 writer->write_u4(0x7fc00000); // collapsing NaNs 727 } else { 728 union { 729 int i; 730 float f; 731 } u; 732 u.f = (float)f; 733 writer->write_u4((u4)u.i); 734 } 735 } 736 737 // dump a jdouble 738 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 739 union { 740 jlong l; 741 double d; 742 } u; 743 if (g_isnan(d)) { // collapsing NaNs 744 u.l = (jlong)(0x7ff80000); 745 u.l = (u.l << 32); 746 } else { 747 u.d = (double)d; 748 } 749 writer->write_u8((u8)u.l); 750 } 751 752 // dumps the raw value of the given field 753 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 754 switch (type) { 755 case JVM_SIGNATURE_CLASS : 756 case JVM_SIGNATURE_ARRAY : { 757 oop o; 758 if (UseCompressedOops) { 759 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 760 } else { 761 o = oopDesc::load_decode_heap_oop((oop*)addr); 762 } 763 764 // reflection and Unsafe classes may have a reference to a 765 // Klass* so filter it out. 766 assert(o->is_oop_or_null(), "Expected an oop or NULL at " PTR_FORMAT, p2i(o)); 767 writer->write_objectID(o); 768 break; 769 } 770 case JVM_SIGNATURE_BYTE : { 771 jbyte* b = (jbyte*)addr; 772 writer->write_u1((u1)*b); 773 break; 774 } 775 case JVM_SIGNATURE_CHAR : { 776 jchar* c = (jchar*)addr; 777 writer->write_u2((u2)*c); 778 break; 779 } 780 case JVM_SIGNATURE_SHORT : { 781 jshort* s = (jshort*)addr; 782 writer->write_u2((u2)*s); 783 break; 784 } 785 case JVM_SIGNATURE_FLOAT : { 786 jfloat* f = (jfloat*)addr; 787 dump_float(writer, *f); 788 break; 789 } 790 case JVM_SIGNATURE_DOUBLE : { 791 jdouble* f = (jdouble*)addr; 792 dump_double(writer, *f); 793 break; 794 } 795 case JVM_SIGNATURE_INT : { 796 jint* i = (jint*)addr; 797 writer->write_u4((u4)*i); 798 break; 799 } 800 case JVM_SIGNATURE_LONG : { 801 jlong* l = (jlong*)addr; 802 writer->write_u8((u8)*l); 803 break; 804 } 805 case JVM_SIGNATURE_BOOLEAN : { 806 jboolean* b = (jboolean*)addr; 807 writer->write_u1((u1)*b); 808 break; 809 } 810 default : ShouldNotReachHere(); 811 } 812 } 813 814 // returns the size of the instance of the given class 815 u4 DumperSupport::instance_size(Klass* k) { 816 HandleMark hm; 817 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 818 819 u4 size = 0; 820 821 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 822 if (!fld.access_flags().is_static()) { 823 Symbol* sig = fld.signature(); 824 switch (sig->byte_at(0)) { 825 case JVM_SIGNATURE_CLASS : 826 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 827 828 case JVM_SIGNATURE_BYTE : 829 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 830 831 case JVM_SIGNATURE_CHAR : 832 case JVM_SIGNATURE_SHORT : size += 2; break; 833 834 case JVM_SIGNATURE_INT : 835 case JVM_SIGNATURE_FLOAT : size += 4; break; 836 837 case JVM_SIGNATURE_LONG : 838 case JVM_SIGNATURE_DOUBLE : size += 8; break; 839 840 default : ShouldNotReachHere(); 841 } 842 } 843 } 844 return size; 845 } 846 847 // dumps static fields of the given class 848 void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) { 849 HandleMark hm; 850 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 851 852 // pass 1 - count the static fields 853 u2 field_count = 0; 854 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 855 if (fldc.access_flags().is_static()) field_count++; 856 } 857 858 writer->write_u2(field_count); 859 860 // pass 2 - dump the field descriptors and raw values 861 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 862 if (fld.access_flags().is_static()) { 863 Symbol* sig = fld.signature(); 864 865 writer->write_symbolID(fld.name()); // name 866 writer->write_u1(sig2tag(sig)); // type 867 868 // value 869 int offset = fld.offset(); 870 address addr = (address)ikh->java_mirror() + offset; 871 872 dump_field_value(writer, sig->byte_at(0), addr); 873 } 874 } 875 } 876 877 // dump the raw values of the instance fields of the given object 878 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 879 HandleMark hm; 880 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 881 882 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 883 if (!fld.access_flags().is_static()) { 884 Symbol* sig = fld.signature(); 885 address addr = (address)o + fld.offset(); 886 887 dump_field_value(writer, sig->byte_at(0), addr); 888 } 889 } 890 } 891 892 // dumps the definition of the instance fields for a given class 893 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) { 894 HandleMark hm; 895 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 896 897 // pass 1 - count the instance fields 898 u2 field_count = 0; 899 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 900 if (!fldc.access_flags().is_static()) field_count++; 901 } 902 903 writer->write_u2(field_count); 904 905 // pass 2 - dump the field descriptors 906 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 907 if (!fld.access_flags().is_static()) { 908 Symbol* sig = fld.signature(); 909 910 writer->write_symbolID(fld.name()); // name 911 writer->write_u1(sig2tag(sig)); // type 912 } 913 } 914 } 915 916 // creates HPROF_GC_INSTANCE_DUMP record for the given object 917 void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 918 Klass* k = o->klass(); 919 920 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 921 writer->write_objectID(o); 922 writer->write_u4(STACK_TRACE_ID); 923 924 // class ID 925 writer->write_classID(k); 926 927 // number of bytes that follow 928 writer->write_u4(instance_size(k) ); 929 930 // field values 931 dump_instance_fields(writer, o); 932 } 933 934 // creates HPROF_GC_CLASS_DUMP record for the given class and each of 935 // its array classes 936 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) { 937 InstanceKlass* ik = InstanceKlass::cast(k); 938 939 // We can safepoint and do a heap dump at a point where we have a Klass, 940 // but no java mirror class has been setup for it. So we need to check 941 // that the class is at least loaded, to avoid crash from a null mirror. 942 if (!ik->is_loaded()) { 943 return; 944 } 945 946 writer->write_u1(HPROF_GC_CLASS_DUMP); 947 948 // class ID 949 writer->write_classID(ik); 950 writer->write_u4(STACK_TRACE_ID); 951 952 // super class ID 953 Klass* java_super = ik->java_super(); 954 if (java_super == NULL) { 955 writer->write_objectID(oop(NULL)); 956 } else { 957 writer->write_classID(java_super); 958 } 959 960 writer->write_objectID(ik->class_loader()); 961 writer->write_objectID(ik->signers()); 962 writer->write_objectID(ik->protection_domain()); 963 964 // reserved 965 writer->write_objectID(oop(NULL)); 966 writer->write_objectID(oop(NULL)); 967 968 // instance size 969 writer->write_u4(DumperSupport::instance_size(k)); 970 971 // size of constant pool - ignored by HAT 1.1 972 writer->write_u2(0); 973 974 // number of static fields 975 dump_static_fields(writer, k); 976 977 // description of instance fields 978 dump_instance_field_descriptors(writer, k); 979 980 // array classes 981 k = k->array_klass_or_null(); 982 while (k != NULL) { 983 Klass* klass = k; 984 assert(klass->is_objArray_klass(), "not an ObjArrayKlass"); 985 986 writer->write_u1(HPROF_GC_CLASS_DUMP); 987 writer->write_classID(klass); 988 writer->write_u4(STACK_TRACE_ID); 989 990 // super class of array classes is java.lang.Object 991 java_super = klass->java_super(); 992 assert(java_super != NULL, "checking"); 993 writer->write_classID(java_super); 994 995 writer->write_objectID(ik->class_loader()); 996 writer->write_objectID(ik->signers()); 997 writer->write_objectID(ik->protection_domain()); 998 999 writer->write_objectID(oop(NULL)); // reserved 1000 writer->write_objectID(oop(NULL)); 1001 writer->write_u4(0); // instance size 1002 writer->write_u2(0); // constant pool 1003 writer->write_u2(0); // static fields 1004 writer->write_u2(0); // instance fields 1005 1006 // get the array class for the next rank 1007 k = klass->array_klass_or_null(); 1008 } 1009 } 1010 1011 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 1012 // class (and each multi-dimensional array class too) 1013 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) { 1014 // array classes 1015 while (k != NULL) { 1016 Klass* klass = k; 1017 1018 writer->write_u1(HPROF_GC_CLASS_DUMP); 1019 writer->write_classID(klass); 1020 writer->write_u4(STACK_TRACE_ID); 1021 1022 // super class of array classes is java.lang.Object 1023 Klass* java_super = klass->java_super(); 1024 assert(java_super != NULL, "checking"); 1025 writer->write_classID(java_super); 1026 1027 writer->write_objectID(oop(NULL)); // loader 1028 writer->write_objectID(oop(NULL)); // signers 1029 writer->write_objectID(oop(NULL)); // protection domain 1030 1031 writer->write_objectID(oop(NULL)); // reserved 1032 writer->write_objectID(oop(NULL)); 1033 writer->write_u4(0); // instance size 1034 writer->write_u2(0); // constant pool 1035 writer->write_u2(0); // static fields 1036 writer->write_u2(0); // instance fields 1037 1038 // get the array class for the next rank 1039 k = klass->array_klass_or_null(); 1040 } 1041 } 1042 1043 // Hprof uses an u4 as record length field, 1044 // which means we need to truncate arrays that are too long. 1045 int DumperSupport::calculate_array_max_length(DumpWriter* writer, arrayOop array, short header_size) { 1046 BasicType type = ArrayKlass::cast(array->klass())->element_type(); 1047 assert(type >= T_BOOLEAN && type <= T_OBJECT, "invalid array element type"); 1048 1049 int length = array->length(); 1050 1051 int type_size; 1052 if (type == T_OBJECT) { 1053 type_size = sizeof(address); 1054 } else { 1055 type_size = type2aelembytes(type); 1056 } 1057 1058 size_t length_in_bytes = (size_t)length * type_size; 1059 1060 // Create a new record if the current record is non-empty and the array can't fit. 1061 julong current_record_length = writer->current_record_length(); 1062 if (current_record_length > 0 && 1063 (current_record_length + header_size + length_in_bytes) > max_juint) { 1064 write_current_dump_record_length(writer); 1065 write_dump_header(writer); 1066 1067 // We now have an empty record. 1068 current_record_length = 0; 1069 } 1070 1071 // Calculate max bytes we can use. 1072 uint max_bytes = max_juint - (header_size + current_record_length); 1073 1074 // Array too long for the record? 1075 // Calculate max length and return it. 1076 if (length_in_bytes > max_bytes) { 1077 length = max_bytes / type_size; 1078 length_in_bytes = (size_t)length * type_size; 1079 1080 warning("cannot dump array of type %s[] with length %d; truncating to length %d", 1081 type2name_tab[type], array->length(), length); 1082 } 1083 return length; 1084 } 1085 1086 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 1087 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 1088 // sizeof(u1) + 2 * sizeof(u4) + sizeof(objectID) + sizeof(classID) 1089 short header_size = 1 + 2 * 4 + 2 * sizeof(address); 1090 1091 int length = calculate_array_max_length(writer, array, header_size); 1092 1093 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 1094 writer->write_objectID(array); 1095 writer->write_u4(STACK_TRACE_ID); 1096 writer->write_u4(length); 1097 1098 // array class ID 1099 writer->write_classID(array->klass()); 1100 1101 // [id]* elements 1102 for (int index = 0; index < length; index++) { 1103 oop o = array->obj_at(index); 1104 writer->write_objectID(o); 1105 } 1106 } 1107 1108 #define WRITE_ARRAY(Array, Type, Size, Length) \ 1109 for (int i = 0; i < Length; i++) { writer->write_##Size((Size)Array->Type##_at(i)); } 1110 1111 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1112 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1113 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); 1114 1115 // 2 * sizeof(u1) + 2 * sizeof(u4) + sizeof(objectID) 1116 short header_size = 2 * 1 + 2 * 4 + sizeof(address); 1117 1118 int length = calculate_array_max_length(writer, array, header_size); 1119 int type_size = type2aelembytes(type); 1120 u4 length_in_bytes = (u4)length * type_size; 1121 1122 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1123 writer->write_objectID(array); 1124 writer->write_u4(STACK_TRACE_ID); 1125 writer->write_u4(length); 1126 writer->write_u1(type2tag(type)); 1127 1128 // nothing to copy 1129 if (length == 0) { 1130 return; 1131 } 1132 1133 // If the byte ordering is big endian then we can copy most types directly 1134 1135 switch (type) { 1136 case T_INT : { 1137 if (Bytes::is_Java_byte_ordering_different()) { 1138 WRITE_ARRAY(array, int, u4, length); 1139 } else { 1140 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1141 } 1142 break; 1143 } 1144 case T_BYTE : { 1145 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1146 break; 1147 } 1148 case T_CHAR : { 1149 if (Bytes::is_Java_byte_ordering_different()) { 1150 WRITE_ARRAY(array, char, u2, length); 1151 } else { 1152 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1153 } 1154 break; 1155 } 1156 case T_SHORT : { 1157 if (Bytes::is_Java_byte_ordering_different()) { 1158 WRITE_ARRAY(array, short, u2, length); 1159 } else { 1160 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1161 } 1162 break; 1163 } 1164 case T_BOOLEAN : { 1165 if (Bytes::is_Java_byte_ordering_different()) { 1166 WRITE_ARRAY(array, bool, u1, length); 1167 } else { 1168 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1169 } 1170 break; 1171 } 1172 case T_LONG : { 1173 if (Bytes::is_Java_byte_ordering_different()) { 1174 WRITE_ARRAY(array, long, u8, length); 1175 } else { 1176 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1177 } 1178 break; 1179 } 1180 1181 // handle float/doubles in a special value to ensure than NaNs are 1182 // written correctly. TO DO: Check if we can avoid this on processors that 1183 // use IEEE 754. 1184 1185 case T_FLOAT : { 1186 for (int i = 0; i < length; i++) { 1187 dump_float(writer, array->float_at(i)); 1188 } 1189 break; 1190 } 1191 case T_DOUBLE : { 1192 for (int i = 0; i < length; i++) { 1193 dump_double(writer, array->double_at(i)); 1194 } 1195 break; 1196 } 1197 default : ShouldNotReachHere(); 1198 } 1199 } 1200 1201 // create a HPROF_FRAME record of the given Method* and bci 1202 void DumperSupport::dump_stack_frame(DumpWriter* writer, 1203 int frame_serial_num, 1204 int class_serial_num, 1205 Method* m, 1206 int bci) { 1207 int line_number; 1208 if (m->is_native()) { 1209 line_number = -3; // native frame 1210 } else { 1211 line_number = m->line_number_from_bci(bci); 1212 } 1213 1214 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1215 writer->write_id(frame_serial_num); // frame serial number 1216 writer->write_symbolID(m->name()); // method's name 1217 writer->write_symbolID(m->signature()); // method's signature 1218 1219 assert(m->method_holder()->is_instance_klass(), "not InstanceKlass"); 1220 writer->write_symbolID(m->method_holder()->source_file_name()); // source file name 1221 writer->write_u4(class_serial_num); // class serial number 1222 writer->write_u4((u4) line_number); // line number 1223 } 1224 1225 1226 // Support class used to generate HPROF_UTF8 records from the entries in the 1227 // SymbolTable. 1228 1229 class SymbolTableDumper : public SymbolClosure { 1230 private: 1231 DumpWriter* _writer; 1232 DumpWriter* writer() const { return _writer; } 1233 public: 1234 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1235 void do_symbol(Symbol** p); 1236 }; 1237 1238 void SymbolTableDumper::do_symbol(Symbol** p) { 1239 ResourceMark rm; 1240 Symbol* sym = load_symbol(p); 1241 int len = sym->utf8_length(); 1242 if (len > 0) { 1243 char* s = sym->as_utf8(); 1244 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1245 writer()->write_symbolID(sym); 1246 writer()->write_raw(s, len); 1247 } 1248 } 1249 1250 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1251 1252 class JNILocalsDumper : public OopClosure { 1253 private: 1254 DumpWriter* _writer; 1255 u4 _thread_serial_num; 1256 int _frame_num; 1257 DumpWriter* writer() const { return _writer; } 1258 public: 1259 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1260 _writer = writer; 1261 _thread_serial_num = thread_serial_num; 1262 _frame_num = -1; // default - empty stack 1263 } 1264 void set_frame_number(int n) { _frame_num = n; } 1265 void do_oop(oop* obj_p); 1266 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1267 }; 1268 1269 1270 void JNILocalsDumper::do_oop(oop* obj_p) { 1271 // ignore null or deleted handles 1272 oop o = *obj_p; 1273 if (o != NULL && o != JNIHandles::deleted_handle()) { 1274 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1275 writer()->write_objectID(o); 1276 writer()->write_u4(_thread_serial_num); 1277 writer()->write_u4((u4)_frame_num); 1278 } 1279 } 1280 1281 1282 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1283 1284 class JNIGlobalsDumper : public OopClosure { 1285 private: 1286 DumpWriter* _writer; 1287 DumpWriter* writer() const { return _writer; } 1288 1289 public: 1290 JNIGlobalsDumper(DumpWriter* writer) { 1291 _writer = writer; 1292 } 1293 void do_oop(oop* obj_p); 1294 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1295 }; 1296 1297 void JNIGlobalsDumper::do_oop(oop* obj_p) { 1298 oop o = *obj_p; 1299 1300 // ignore these 1301 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1302 1303 // we ignore global ref to symbols and other internal objects 1304 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1305 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1306 writer()->write_objectID(o); 1307 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1308 } 1309 }; 1310 1311 1312 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1313 1314 class MonitorUsedDumper : public OopClosure { 1315 private: 1316 DumpWriter* _writer; 1317 DumpWriter* writer() const { return _writer; } 1318 public: 1319 MonitorUsedDumper(DumpWriter* writer) { 1320 _writer = writer; 1321 } 1322 void do_oop(oop* obj_p) { 1323 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1324 writer()->write_objectID(*obj_p); 1325 } 1326 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1327 }; 1328 1329 1330 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1331 1332 class StickyClassDumper : public KlassClosure { 1333 private: 1334 DumpWriter* _writer; 1335 DumpWriter* writer() const { return _writer; } 1336 public: 1337 StickyClassDumper(DumpWriter* writer) { 1338 _writer = writer; 1339 } 1340 void do_klass(Klass* k) { 1341 if (k->is_instance_klass()) { 1342 InstanceKlass* ik = InstanceKlass::cast(k); 1343 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1344 writer()->write_classID(ik); 1345 } 1346 } 1347 }; 1348 1349 1350 class VM_HeapDumper; 1351 1352 // Support class using when iterating over the heap. 1353 1354 class HeapObjectDumper : public ObjectClosure { 1355 private: 1356 VM_HeapDumper* _dumper; 1357 DumpWriter* _writer; 1358 1359 VM_HeapDumper* dumper() { return _dumper; } 1360 DumpWriter* writer() { return _writer; } 1361 1362 // used to indicate that a record has been writen 1363 void mark_end_of_record(); 1364 1365 public: 1366 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1367 _dumper = dumper; 1368 _writer = writer; 1369 } 1370 1371 // called for each object in the heap 1372 void do_object(oop o); 1373 }; 1374 1375 void HeapObjectDumper::do_object(oop o) { 1376 // hide the sentinel for deleted handles 1377 if (o == JNIHandles::deleted_handle()) return; 1378 1379 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1380 if (o->klass() == SystemDictionary::Class_klass()) { 1381 if (!java_lang_Class::is_primitive(o)) { 1382 return; 1383 } 1384 } 1385 1386 if (o->is_instance()) { 1387 // create a HPROF_GC_INSTANCE record for each object 1388 DumperSupport::dump_instance(writer(), o); 1389 mark_end_of_record(); 1390 } else if (o->is_objArray()) { 1391 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1392 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1393 mark_end_of_record(); 1394 } else if (o->is_typeArray()) { 1395 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1396 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1397 mark_end_of_record(); 1398 } 1399 } 1400 1401 // The VM operation that performs the heap dump 1402 class VM_HeapDumper : public VM_GC_Operation { 1403 private: 1404 static VM_HeapDumper* _global_dumper; 1405 static DumpWriter* _global_writer; 1406 DumpWriter* _local_writer; 1407 JavaThread* _oome_thread; 1408 Method* _oome_constructor; 1409 bool _gc_before_heap_dump; 1410 GrowableArray<Klass*>* _klass_map; 1411 ThreadStackTrace** _stack_traces; 1412 int _num_threads; 1413 1414 // accessors and setters 1415 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1416 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1417 void set_global_dumper() { 1418 assert(_global_dumper == NULL, "Error"); 1419 _global_dumper = this; 1420 } 1421 void set_global_writer() { 1422 assert(_global_writer == NULL, "Error"); 1423 _global_writer = _local_writer; 1424 } 1425 void clear_global_dumper() { _global_dumper = NULL; } 1426 void clear_global_writer() { _global_writer = NULL; } 1427 1428 bool skip_operation() const; 1429 1430 // writes a HPROF_LOAD_CLASS record 1431 static void do_load_class(Klass* k); 1432 1433 // writes a HPROF_GC_CLASS_DUMP record for the given class 1434 // (and each array class too) 1435 static void do_class_dump(Klass* k); 1436 1437 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1438 // array (and each multi-dimensional array too) 1439 static void do_basic_type_array_class_dump(Klass* k); 1440 1441 // HPROF_GC_ROOT_THREAD_OBJ records 1442 int do_thread(JavaThread* thread, u4 thread_serial_num); 1443 void do_threads(); 1444 1445 void add_class_serial_number(Klass* k, int serial_num) { 1446 _klass_map->at_put_grow(serial_num, k); 1447 } 1448 1449 // HPROF_TRACE and HPROF_FRAME records 1450 void dump_stack_traces(); 1451 1452 public: 1453 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1454 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1455 GCCause::_heap_dump /* GC Cause */, 1456 0 /* total full collections, dummy, ignored */, 1457 gc_before_heap_dump) { 1458 _local_writer = writer; 1459 _gc_before_heap_dump = gc_before_heap_dump; 1460 _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1461 _stack_traces = NULL; 1462 _num_threads = 0; 1463 if (oome) { 1464 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1465 // get OutOfMemoryError zero-parameter constructor 1466 InstanceKlass* oome_ik = SystemDictionary::OutOfMemoryError_klass(); 1467 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1468 vmSymbols::void_method_signature()); 1469 // get thread throwing OOME when generating the heap dump at OOME 1470 _oome_thread = JavaThread::current(); 1471 } else { 1472 _oome_thread = NULL; 1473 _oome_constructor = NULL; 1474 } 1475 } 1476 ~VM_HeapDumper() { 1477 if (_stack_traces != NULL) { 1478 for (int i=0; i < _num_threads; i++) { 1479 delete _stack_traces[i]; 1480 } 1481 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces); 1482 } 1483 delete _klass_map; 1484 } 1485 1486 VMOp_Type type() const { return VMOp_HeapDumper; } 1487 // used to mark sub-record boundary 1488 void check_segment_length(); 1489 void doit(); 1490 }; 1491 1492 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1493 DumpWriter* VM_HeapDumper::_global_writer = NULL; 1494 1495 bool VM_HeapDumper::skip_operation() const { 1496 return false; 1497 } 1498 1499 // writes a HPROF_HEAP_DUMP_SEGMENT record 1500 void DumperSupport::write_dump_header(DumpWriter* writer) { 1501 if (writer->is_open()) { 1502 writer->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1503 writer->write_u4(0); // current ticks 1504 1505 // record the starting position for the dump (its length will be fixed up later) 1506 writer->set_dump_start(writer->current_offset()); 1507 writer->write_u4(0); 1508 } 1509 } 1510 1511 // fixes up the length of the current dump record 1512 void DumperSupport::write_current_dump_record_length(DumpWriter* writer) { 1513 if (writer->is_open()) { 1514 julong dump_end = writer->bytes_written() + writer->bytes_unwritten(); 1515 julong dump_len = writer->current_record_length(); 1516 1517 // record length must fit in a u4 1518 if (dump_len > max_juint) { 1519 warning("record is too large"); 1520 } 1521 1522 // seek to the dump start and fix-up the length 1523 assert(writer->dump_start() >= 0, "no dump start recorded"); 1524 writer->seek_to_offset(writer->dump_start()); 1525 writer->write_u4((u4)dump_len); 1526 1527 // adjust the total size written to keep the bytes written correct. 1528 writer->adjust_bytes_written(-((jlong) sizeof(u4))); 1529 1530 // seek to dump end so we can continue 1531 writer->seek_to_offset(dump_end); 1532 1533 // no current dump record 1534 writer->set_dump_start((jlong)-1); 1535 } 1536 } 1537 1538 // used on a sub-record boundary to check if we need to start a 1539 // new segment. 1540 void VM_HeapDumper::check_segment_length() { 1541 if (writer()->is_open()) { 1542 julong dump_len = writer()->current_record_length(); 1543 1544 if (dump_len > 2UL*G) { 1545 DumperSupport::write_current_dump_record_length(writer()); 1546 DumperSupport::write_dump_header(writer()); 1547 } 1548 } 1549 } 1550 1551 // fixes up the current dump record and writes HPROF_HEAP_DUMP_END record 1552 void DumperSupport::end_of_dump(DumpWriter* writer) { 1553 if (writer->is_open()) { 1554 write_current_dump_record_length(writer); 1555 1556 writer->write_u1(HPROF_HEAP_DUMP_END); 1557 writer->write_u4(0); 1558 writer->write_u4(0); 1559 } 1560 } 1561 1562 // marks sub-record boundary 1563 void HeapObjectDumper::mark_end_of_record() { 1564 dumper()->check_segment_length(); 1565 } 1566 1567 // writes a HPROF_LOAD_CLASS record for the class (and each of its 1568 // array classes) 1569 void VM_HeapDumper::do_load_class(Klass* k) { 1570 static u4 class_serial_num = 0; 1571 1572 // len of HPROF_LOAD_CLASS record 1573 u4 remaining = 2*oopSize + 2*sizeof(u4); 1574 1575 // write a HPROF_LOAD_CLASS for the class and each array class 1576 do { 1577 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1578 1579 // class serial number is just a number 1580 writer()->write_u4(++class_serial_num); 1581 1582 // class ID 1583 Klass* klass = k; 1584 writer()->write_classID(klass); 1585 1586 // add the Klass* and class serial number pair 1587 dumper()->add_class_serial_number(klass, class_serial_num); 1588 1589 writer()->write_u4(STACK_TRACE_ID); 1590 1591 // class name ID 1592 Symbol* name = klass->name(); 1593 writer()->write_symbolID(name); 1594 1595 // write a LOAD_CLASS record for the array type (if it exists) 1596 k = klass->array_klass_or_null(); 1597 } while (k != NULL); 1598 } 1599 1600 // writes a HPROF_GC_CLASS_DUMP record for the given class 1601 void VM_HeapDumper::do_class_dump(Klass* k) { 1602 if (k->is_instance_klass()) { 1603 DumperSupport::dump_class_and_array_classes(writer(), k); 1604 } 1605 } 1606 1607 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1608 // array (and each multi-dimensional array too) 1609 void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) { 1610 DumperSupport::dump_basic_type_array_class(writer(), k); 1611 } 1612 1613 // Walk the stack of the given thread. 1614 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1615 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1616 // 1617 // It returns the number of Java frames in this thread stack 1618 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1619 JNILocalsDumper blk(writer(), thread_serial_num); 1620 1621 oop threadObj = java_thread->threadObj(); 1622 assert(threadObj != NULL, "sanity check"); 1623 1624 int stack_depth = 0; 1625 if (java_thread->has_last_Java_frame()) { 1626 1627 // vframes are resource allocated 1628 Thread* current_thread = Thread::current(); 1629 ResourceMark rm(current_thread); 1630 HandleMark hm(current_thread); 1631 1632 RegisterMap reg_map(java_thread); 1633 frame f = java_thread->last_frame(); 1634 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1635 frame* last_entry_frame = NULL; 1636 int extra_frames = 0; 1637 1638 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1639 extra_frames++; 1640 } 1641 while (vf != NULL) { 1642 blk.set_frame_number(stack_depth); 1643 if (vf->is_java_frame()) { 1644 1645 // java frame (interpreted, compiled, ...) 1646 javaVFrame *jvf = javaVFrame::cast(vf); 1647 if (!(jvf->method()->is_native())) { 1648 StackValueCollection* locals = jvf->locals(); 1649 for (int slot=0; slot<locals->size(); slot++) { 1650 if (locals->at(slot)->type() == T_OBJECT) { 1651 oop o = locals->obj_at(slot)(); 1652 1653 if (o != NULL) { 1654 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1655 writer()->write_objectID(o); 1656 writer()->write_u4(thread_serial_num); 1657 writer()->write_u4((u4) (stack_depth + extra_frames)); 1658 } 1659 } 1660 } 1661 StackValueCollection *exprs = jvf->expressions(); 1662 for(int index = 0; index < exprs->size(); index++) { 1663 if (exprs->at(index)->type() == T_OBJECT) { 1664 oop o = exprs->obj_at(index)(); 1665 if (o != NULL) { 1666 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1667 writer()->write_objectID(o); 1668 writer()->write_u4(thread_serial_num); 1669 writer()->write_u4((u4) (stack_depth + extra_frames)); 1670 } 1671 } 1672 } 1673 } else { 1674 // native frame 1675 if (stack_depth == 0) { 1676 // JNI locals for the top frame. 1677 java_thread->active_handles()->oops_do(&blk); 1678 } else { 1679 if (last_entry_frame != NULL) { 1680 // JNI locals for the entry frame 1681 assert(last_entry_frame->is_entry_frame(), "checking"); 1682 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1683 } 1684 } 1685 } 1686 // increment only for Java frames 1687 stack_depth++; 1688 last_entry_frame = NULL; 1689 1690 } else { 1691 // externalVFrame - if it's an entry frame then report any JNI locals 1692 // as roots when we find the corresponding native javaVFrame 1693 frame* fr = vf->frame_pointer(); 1694 assert(fr != NULL, "sanity check"); 1695 if (fr->is_entry_frame()) { 1696 last_entry_frame = fr; 1697 } 1698 } 1699 vf = vf->sender(); 1700 } 1701 } else { 1702 // no last java frame but there may be JNI locals 1703 java_thread->active_handles()->oops_do(&blk); 1704 } 1705 return stack_depth; 1706 } 1707 1708 1709 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1710 // the stack so that locals and JNI locals are dumped. 1711 void VM_HeapDumper::do_threads() { 1712 for (int i=0; i < _num_threads; i++) { 1713 JavaThread* thread = _stack_traces[i]->thread(); 1714 oop threadObj = thread->threadObj(); 1715 u4 thread_serial_num = i+1; 1716 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1717 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1718 writer()->write_objectID(threadObj); 1719 writer()->write_u4(thread_serial_num); // thread number 1720 writer()->write_u4(stack_serial_num); // stack trace serial number 1721 int num_frames = do_thread(thread, thread_serial_num); 1722 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1723 "total number of Java frames not matched"); 1724 } 1725 } 1726 1727 1728 // The VM operation that dumps the heap. The dump consists of the following 1729 // records: 1730 // 1731 // HPROF_HEADER 1732 // [HPROF_UTF8]* 1733 // [HPROF_LOAD_CLASS]* 1734 // [[HPROF_FRAME]*|HPROF_TRACE]* 1735 // [HPROF_GC_CLASS_DUMP]* 1736 // [HPROF_HEAP_DUMP_SEGMENT]* 1737 // HPROF_HEAP_DUMP_END 1738 // 1739 // The HPROF_TRACE records represent the stack traces where the heap dump 1740 // is generated and a "dummy trace" record which does not include 1741 // any frames. The dummy trace record is used to be referenced as the 1742 // unknown object alloc site. 1743 // 1744 // Each HPROF_HEAP_DUMP_SEGMENT record has a length followed by sub-records. 1745 // To allow the heap dump be generated in a single pass we remember the position 1746 // of the dump length and fix it up after all sub-records have been written. 1747 // To generate the sub-records we iterate over the heap, writing 1748 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1749 // records as we go. Once that is done we write records for some of the GC 1750 // roots. 1751 1752 void VM_HeapDumper::doit() { 1753 1754 HandleMark hm; 1755 CollectedHeap* ch = Universe::heap(); 1756 1757 ch->ensure_parsability(false); // must happen, even if collection does 1758 // not happen (e.g. due to GCLocker) 1759 1760 if (_gc_before_heap_dump) { 1761 if (GCLocker::is_active()) { 1762 warning("GC locker is held; pre-heapdump GC was skipped"); 1763 } else { 1764 ch->collect_as_vm_thread(GCCause::_heap_dump); 1765 } 1766 } 1767 1768 // At this point we should be the only dumper active, so 1769 // the following should be safe. 1770 set_global_dumper(); 1771 set_global_writer(); 1772 1773 // Write the file header - we always use 1.0.2 1774 size_t used = ch->used(); 1775 const char* header = "JAVA PROFILE 1.0.2"; 1776 1777 // header is few bytes long - no chance to overflow int 1778 writer()->write_raw((void*)header, (int)strlen(header)); 1779 writer()->write_u1(0); // terminator 1780 writer()->write_u4(oopSize); 1781 writer()->write_u8(os::javaTimeMillis()); 1782 1783 // HPROF_UTF8 records 1784 SymbolTableDumper sym_dumper(writer()); 1785 SymbolTable::symbols_do(&sym_dumper); 1786 1787 // write HPROF_LOAD_CLASS records 1788 ClassLoaderDataGraph::classes_do(&do_load_class); 1789 Universe::basic_type_classes_do(&do_load_class); 1790 1791 // write HPROF_FRAME and HPROF_TRACE records 1792 // this must be called after _klass_map is built when iterating the classes above. 1793 dump_stack_traces(); 1794 1795 // write HPROF_HEAP_DUMP_SEGMENT 1796 DumperSupport::write_dump_header(writer()); 1797 1798 // Writes HPROF_GC_CLASS_DUMP records 1799 ClassLoaderDataGraph::classes_do(&do_class_dump); 1800 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1801 check_segment_length(); 1802 1803 // writes HPROF_GC_INSTANCE_DUMP records. 1804 // After each sub-record is written check_segment_length will be invoked 1805 // to check if the current segment exceeds a threshold. If so, a new 1806 // segment is started. 1807 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1808 // of the heap dump. 1809 HeapObjectDumper obj_dumper(this, writer()); 1810 Universe::heap()->safe_object_iterate(&obj_dumper); 1811 1812 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1813 do_threads(); 1814 check_segment_length(); 1815 1816 // HPROF_GC_ROOT_MONITOR_USED 1817 MonitorUsedDumper mon_dumper(writer()); 1818 ObjectSynchronizer::oops_do(&mon_dumper); 1819 check_segment_length(); 1820 1821 // HPROF_GC_ROOT_JNI_GLOBAL 1822 JNIGlobalsDumper jni_dumper(writer()); 1823 JNIHandles::oops_do(&jni_dumper); 1824 check_segment_length(); 1825 1826 // HPROF_GC_ROOT_STICKY_CLASS 1827 StickyClassDumper class_dumper(writer()); 1828 ClassLoaderData::the_null_class_loader_data()->classes_do(&class_dumper); 1829 //SystemDictionary::always_strong_classes_do(&class_dumper); 1830 1831 // fixes up the length of the dump record and writes the HPROF_HEAP_DUMP_END record. 1832 DumperSupport::end_of_dump(writer()); 1833 1834 // Now we clear the global variables, so that a future dumper might run. 1835 clear_global_dumper(); 1836 clear_global_writer(); 1837 } 1838 1839 void VM_HeapDumper::dump_stack_traces() { 1840 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1841 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1842 writer()->write_u4((u4) STACK_TRACE_ID); 1843 writer()->write_u4(0); // thread number 1844 writer()->write_u4(0); // frame count 1845 1846 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal); 1847 int frame_serial_num = 0; 1848 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1849 oop threadObj = thread->threadObj(); 1850 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1851 // dump thread stack trace 1852 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1853 stack_trace->dump_stack_at_safepoint(-1); 1854 _stack_traces[_num_threads++] = stack_trace; 1855 1856 // write HPROF_FRAME records for this thread's stack trace 1857 int depth = stack_trace->get_stack_depth(); 1858 int thread_frame_start = frame_serial_num; 1859 int extra_frames = 0; 1860 // write fake frame that makes it look like the thread, which caused OOME, 1861 // is in the OutOfMemoryError zero-parameter constructor 1862 if (thread == _oome_thread && _oome_constructor != NULL) { 1863 int oome_serial_num = _klass_map->find(_oome_constructor->method_holder()); 1864 // the class serial number starts from 1 1865 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1866 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1867 _oome_constructor, 0); 1868 extra_frames++; 1869 } 1870 for (int j=0; j < depth; j++) { 1871 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1872 Method* m = frame->method(); 1873 int class_serial_num = _klass_map->find(m->method_holder()); 1874 // the class serial number starts from 1 1875 assert(class_serial_num > 0, "class not found"); 1876 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1877 } 1878 depth += extra_frames; 1879 1880 // write HPROF_TRACE record for one thread 1881 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1882 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1883 writer()->write_u4(stack_serial_num); // stack trace serial number 1884 writer()->write_u4((u4) _num_threads); // thread serial number 1885 writer()->write_u4(depth); // frame count 1886 for (int j=1; j <= depth; j++) { 1887 writer()->write_id(thread_frame_start + j); 1888 } 1889 } 1890 } 1891 } 1892 1893 // dump the heap to given path. 1894 int HeapDumper::dump(const char* path) { 1895 assert(path != NULL && strlen(path) > 0, "path missing"); 1896 1897 // print message in interactive case 1898 if (print_to_tty()) { 1899 tty->print_cr("Dumping heap to %s ...", path); 1900 timer()->start(); 1901 } 1902 1903 // create the dump writer. If the file can be opened then bail 1904 DumpWriter writer(path); 1905 if (!writer.is_open()) { 1906 set_error(writer.error()); 1907 if (print_to_tty()) { 1908 tty->print_cr("Unable to create %s: %s", path, 1909 (error() != NULL) ? error() : "reason unknown"); 1910 } 1911 return -1; 1912 } 1913 1914 // generate the dump 1915 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1916 if (Thread::current()->is_VM_thread()) { 1917 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1918 dumper.doit(); 1919 } else { 1920 VMThread::execute(&dumper); 1921 } 1922 1923 // close dump file and record any error that the writer may have encountered 1924 writer.close(); 1925 set_error(writer.error()); 1926 1927 // print message in interactive case 1928 if (print_to_tty()) { 1929 timer()->stop(); 1930 if (error() == NULL) { 1931 tty->print_cr("Heap dump file created [" JULONG_FORMAT " bytes in %3.3f secs]", 1932 writer.bytes_written(), timer()->seconds()); 1933 } else { 1934 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1935 } 1936 } 1937 1938 return (writer.error() == NULL) ? 0 : -1; 1939 } 1940 1941 // stop timer (if still active), and free any error string we might be holding 1942 HeapDumper::~HeapDumper() { 1943 if (timer()->is_active()) { 1944 timer()->stop(); 1945 } 1946 set_error(NULL); 1947 } 1948 1949 1950 // returns the error string (resource allocated), or NULL 1951 char* HeapDumper::error_as_C_string() const { 1952 if (error() != NULL) { 1953 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1954 strcpy(str, error()); 1955 return str; 1956 } else { 1957 return NULL; 1958 } 1959 } 1960 1961 // set the error string 1962 void HeapDumper::set_error(char* error) { 1963 if (_error != NULL) { 1964 os::free(_error); 1965 } 1966 if (error == NULL) { 1967 _error = NULL; 1968 } else { 1969 _error = os::strdup(error); 1970 assert(_error != NULL, "allocation failure"); 1971 } 1972 } 1973 1974 // Called by out-of-memory error reporting by a single Java thread 1975 // outside of a JVM safepoint 1976 void HeapDumper::dump_heap_from_oome() { 1977 HeapDumper::dump_heap(true); 1978 } 1979 1980 // Called by error reporting by a single Java thread outside of a JVM safepoint, 1981 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1982 // callers are strictly serialized and guaranteed not to interfere below. For more 1983 // general use, however, this method will need modification to prevent 1984 // inteference when updating the static variables base_path and dump_file_seq below. 1985 void HeapDumper::dump_heap() { 1986 HeapDumper::dump_heap(false); 1987 } 1988 1989 void HeapDumper::dump_heap(bool oome) { 1990 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1991 static uint dump_file_seq = 0; 1992 char* my_path; 1993 const int max_digit_chars = 20; 1994 1995 const char* dump_file_name = "java_pid"; 1996 const char* dump_file_ext = ".hprof"; 1997 1998 // The dump file defaults to java_pid<pid>.hprof in the current working 1999 // directory. HeapDumpPath=<file> can be used to specify an alternative 2000 // dump file name or a directory where dump file is created. 2001 if (dump_file_seq == 0) { // first time in, we initialize base_path 2002 // Calculate potentially longest base path and check if we have enough 2003 // allocated statically. 2004 const size_t total_length = 2005 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + 2006 strlen(os::file_separator()) + max_digit_chars + 2007 strlen(dump_file_name) + strlen(dump_file_ext) + 1; 2008 if (total_length > sizeof(base_path)) { 2009 warning("Cannot create heap dump file. HeapDumpPath is too long."); 2010 return; 2011 } 2012 2013 bool use_default_filename = true; 2014 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 2015 // HeapDumpPath=<file> not specified 2016 } else { 2017 strcpy(base_path, HeapDumpPath); 2018 // check if the path is a directory (must exist) 2019 DIR* dir = os::opendir(base_path); 2020 if (dir == NULL) { 2021 use_default_filename = false; 2022 } else { 2023 // HeapDumpPath specified a directory. We append a file separator 2024 // (if needed). 2025 os::closedir(dir); 2026 size_t fs_len = strlen(os::file_separator()); 2027 if (strlen(base_path) >= fs_len) { 2028 char* end = base_path; 2029 end += (strlen(base_path) - fs_len); 2030 if (strcmp(end, os::file_separator()) != 0) { 2031 strcat(base_path, os::file_separator()); 2032 } 2033 } 2034 } 2035 } 2036 // If HeapDumpPath wasn't a file name then we append the default name 2037 if (use_default_filename) { 2038 const size_t dlen = strlen(base_path); // if heap dump dir specified 2039 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", 2040 dump_file_name, os::current_process_id(), dump_file_ext); 2041 } 2042 const size_t len = strlen(base_path) + 1; 2043 my_path = (char*)os::malloc(len, mtInternal); 2044 if (my_path == NULL) { 2045 warning("Cannot create heap dump file. Out of system memory."); 2046 return; 2047 } 2048 strncpy(my_path, base_path, len); 2049 } else { 2050 // Append a sequence number id for dumps following the first 2051 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 2052 my_path = (char*)os::malloc(len, mtInternal); 2053 if (my_path == NULL) { 2054 warning("Cannot create heap dump file. Out of system memory."); 2055 return; 2056 } 2057 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); 2058 } 2059 dump_file_seq++; // increment seq number for next time we dump 2060 2061 HeapDumper dumper(false /* no GC before heap dump */, 2062 true /* send to tty */, 2063 oome /* pass along out-of-memory-error flag */); 2064 dumper.dump(my_path); 2065 os::free(my_path); 2066 }