1 /* 2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/symbolTable.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "gc_implementation/shared/vmGCOperations.hpp" 30 #include "memory/gcLocker.inline.hpp" 31 #include "memory/genCollectedHeap.hpp" 32 #include "memory/universe.hpp" 33 #include "oops/objArrayKlass.hpp" 34 #include "runtime/javaCalls.hpp" 35 #include "runtime/jniHandles.hpp" 36 #include "runtime/os.hpp" 37 #include "runtime/reflectionUtils.hpp" 38 #include "runtime/vframe.hpp" 39 #include "runtime/vmThread.hpp" 40 #include "runtime/vm_operations.hpp" 41 #include "services/heapDumper.hpp" 42 #include "services/threadService.hpp" 43 #include "utilities/ostream.hpp" 44 #include "utilities/macros.hpp" 45 #if INCLUDE_ALL_GCS 46 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 47 #endif // INCLUDE_ALL_GCS 48 49 /* 50 * HPROF binary format - description copied from: 51 * src/share/demo/jvmti/hprof/hprof_io.c 52 * 53 * 54 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2" 55 * (0-terminated) 56 * 57 * u4 size of identifiers. Identifiers are used to represent 58 * UTF8 strings, objects, stack traces, etc. They usually 59 * have the same size as host pointers. For example, on 60 * Solaris and Win32, the size is 4. 61 * u4 high word 62 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 63 * [record]* a sequence of records. 64 * 65 * 66 * Record format: 67 * 68 * u1 a TAG denoting the type of the record 69 * u4 number of *microseconds* since the time stamp in the 70 * header. (wraps around in a little more than an hour) 71 * u4 number of bytes *remaining* in the record. Note that 72 * this number excludes the tag and the length field itself. 73 * [u1]* BODY of the record (a sequence of bytes) 74 * 75 * 76 * The following TAGs are supported: 77 * 78 * TAG BODY notes 79 *---------------------------------------------------------- 80 * HPROF_UTF8 a UTF8-encoded name 81 * 82 * id name ID 83 * [u1]* UTF8 characters (no trailing zero) 84 * 85 * HPROF_LOAD_CLASS a newly loaded class 86 * 87 * u4 class serial number (> 0) 88 * id class object ID 89 * u4 stack trace serial number 90 * id class name ID 91 * 92 * HPROF_UNLOAD_CLASS an unloading class 93 * 94 * u4 class serial_number 95 * 96 * HPROF_FRAME a Java stack frame 97 * 98 * id stack frame ID 99 * id method name ID 100 * id method signature ID 101 * id source file name ID 102 * u4 class serial number 103 * i4 line number. >0: normal 104 * -1: unknown 105 * -2: compiled method 106 * -3: native method 107 * 108 * HPROF_TRACE a Java stack trace 109 * 110 * u4 stack trace serial number 111 * u4 thread serial number 112 * u4 number of frames 113 * [id]* stack frame IDs 114 * 115 * 116 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC 117 * 118 * u2 flags 0x0001: incremental vs. complete 119 * 0x0002: sorted by allocation vs. live 120 * 0x0004: whether to force a GC 121 * u4 cutoff ratio 122 * u4 total live bytes 123 * u4 total live instances 124 * u8 total bytes allocated 125 * u8 total instances allocated 126 * u4 number of sites that follow 127 * [u1 is_array: 0: normal object 128 * 2: object array 129 * 4: boolean array 130 * 5: char array 131 * 6: float array 132 * 7: double array 133 * 8: byte array 134 * 9: short array 135 * 10: int array 136 * 11: long array 137 * u4 class serial number (may be zero during startup) 138 * u4 stack trace serial number 139 * u4 number of bytes alive 140 * u4 number of instances alive 141 * u4 number of bytes allocated 142 * u4]* number of instance allocated 143 * 144 * HPROF_START_THREAD a newly started thread. 145 * 146 * u4 thread serial number (> 0) 147 * id thread object ID 148 * u4 stack trace serial number 149 * id thread name ID 150 * id thread group name ID 151 * id thread group parent name ID 152 * 153 * HPROF_END_THREAD a terminating thread. 154 * 155 * u4 thread serial number 156 * 157 * HPROF_HEAP_SUMMARY heap summary 158 * 159 * u4 total live bytes 160 * u4 total live instances 161 * u8 total bytes allocated 162 * u8 total instances allocated 163 * 164 * HPROF_HEAP_DUMP denote a heap dump 165 * 166 * [heap dump sub-records]* 167 * 168 * There are four kinds of heap dump sub-records: 169 * 170 * u1 sub-record type 171 * 172 * HPROF_GC_ROOT_UNKNOWN unknown root 173 * 174 * id object ID 175 * 176 * HPROF_GC_ROOT_THREAD_OBJ thread object 177 * 178 * id thread object ID (may be 0 for a 179 * thread newly attached through JNI) 180 * u4 thread sequence number 181 * u4 stack trace sequence number 182 * 183 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root 184 * 185 * id object ID 186 * id JNI global ref ID 187 * 188 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref 189 * 190 * id object ID 191 * u4 thread serial number 192 * u4 frame # in stack trace (-1 for empty) 193 * 194 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame 195 * 196 * id object ID 197 * u4 thread serial number 198 * u4 frame # in stack trace (-1 for empty) 199 * 200 * HPROF_GC_ROOT_NATIVE_STACK Native stack 201 * 202 * id object ID 203 * u4 thread serial number 204 * 205 * HPROF_GC_ROOT_STICKY_CLASS System class 206 * 207 * id object ID 208 * 209 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block 210 * 211 * id object ID 212 * u4 thread serial number 213 * 214 * HPROF_GC_ROOT_MONITOR_USED Busy monitor 215 * 216 * id object ID 217 * 218 * HPROF_GC_CLASS_DUMP dump of a class object 219 * 220 * id class object ID 221 * u4 stack trace serial number 222 * id super class object ID 223 * id class loader object ID 224 * id signers object ID 225 * id protection domain object ID 226 * id reserved 227 * id reserved 228 * 229 * u4 instance size (in bytes) 230 * 231 * u2 size of constant pool 232 * [u2, constant pool index, 233 * ty, type 234 * 2: object 235 * 4: boolean 236 * 5: char 237 * 6: float 238 * 7: double 239 * 8: byte 240 * 9: short 241 * 10: int 242 * 11: long 243 * vl]* and value 244 * 245 * u2 number of static fields 246 * [id, static field name, 247 * ty, type, 248 * vl]* and value 249 * 250 * u2 number of inst. fields (not inc. super) 251 * [id, instance field name, 252 * ty]* type 253 * 254 * HPROF_GC_INSTANCE_DUMP dump of a normal object 255 * 256 * id object ID 257 * u4 stack trace serial number 258 * id class object ID 259 * u4 number of bytes that follow 260 * [vl]* instance field values (class, followed 261 * by super, super's super ...) 262 * 263 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array 264 * 265 * id array object ID 266 * u4 stack trace serial number 267 * u4 number of elements 268 * id array class ID 269 * [id]* elements 270 * 271 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array 272 * 273 * id array object ID 274 * u4 stack trace serial number 275 * u4 number of elements 276 * u1 element type 277 * 4: boolean array 278 * 5: char array 279 * 6: float array 280 * 7: double array 281 * 8: byte array 282 * 9: short array 283 * 10: int array 284 * 11: long array 285 * [u1]* elements 286 * 287 * HPROF_CPU_SAMPLES a set of sample traces of running threads 288 * 289 * u4 total number of samples 290 * u4 # of traces 291 * [u4 # of samples 292 * u4]* stack trace serial number 293 * 294 * HPROF_CONTROL_SETTINGS the settings of on/off switches 295 * 296 * u4 0x00000001: alloc traces on/off 297 * 0x00000002: cpu sampling on/off 298 * u2 stack trace depth 299 * 300 * 301 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally 302 * be generated as a sequence of heap dump segments. This sequence is 303 * terminated by an end record. The additional tags allowed by format 304 * "JAVA PROFILE 1.0.2" are: 305 * 306 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment 307 * 308 * [heap dump sub-records]* 309 * The same sub-record types allowed by HPROF_HEAP_DUMP 310 * 311 * HPROF_HEAP_DUMP_END denotes the end of a heap dump 312 * 313 */ 314 315 316 // HPROF tags 317 318 typedef enum { 319 // top-level records 320 HPROF_UTF8 = 0x01, 321 HPROF_LOAD_CLASS = 0x02, 322 HPROF_UNLOAD_CLASS = 0x03, 323 HPROF_FRAME = 0x04, 324 HPROF_TRACE = 0x05, 325 HPROF_ALLOC_SITES = 0x06, 326 HPROF_HEAP_SUMMARY = 0x07, 327 HPROF_START_THREAD = 0x0A, 328 HPROF_END_THREAD = 0x0B, 329 HPROF_HEAP_DUMP = 0x0C, 330 HPROF_CPU_SAMPLES = 0x0D, 331 HPROF_CONTROL_SETTINGS = 0x0E, 332 333 // 1.0.2 record types 334 HPROF_HEAP_DUMP_SEGMENT = 0x1C, 335 HPROF_HEAP_DUMP_END = 0x2C, 336 337 // field types 338 HPROF_ARRAY_OBJECT = 0x01, 339 HPROF_NORMAL_OBJECT = 0x02, 340 HPROF_BOOLEAN = 0x04, 341 HPROF_CHAR = 0x05, 342 HPROF_FLOAT = 0x06, 343 HPROF_DOUBLE = 0x07, 344 HPROF_BYTE = 0x08, 345 HPROF_SHORT = 0x09, 346 HPROF_INT = 0x0A, 347 HPROF_LONG = 0x0B, 348 349 // data-dump sub-records 350 HPROF_GC_ROOT_UNKNOWN = 0xFF, 351 HPROF_GC_ROOT_JNI_GLOBAL = 0x01, 352 HPROF_GC_ROOT_JNI_LOCAL = 0x02, 353 HPROF_GC_ROOT_JAVA_FRAME = 0x03, 354 HPROF_GC_ROOT_NATIVE_STACK = 0x04, 355 HPROF_GC_ROOT_STICKY_CLASS = 0x05, 356 HPROF_GC_ROOT_THREAD_BLOCK = 0x06, 357 HPROF_GC_ROOT_MONITOR_USED = 0x07, 358 HPROF_GC_ROOT_THREAD_OBJ = 0x08, 359 HPROF_GC_CLASS_DUMP = 0x20, 360 HPROF_GC_INSTANCE_DUMP = 0x21, 361 HPROF_GC_OBJ_ARRAY_DUMP = 0x22, 362 HPROF_GC_PRIM_ARRAY_DUMP = 0x23 363 } hprofTag; 364 365 // Default stack trace ID (used for dummy HPROF_TRACE record) 366 enum { 367 STACK_TRACE_ID = 1, 368 INITIAL_CLASS_COUNT = 200 369 }; 370 371 // Supports I/O operations on a dump file 372 373 class DumpWriter : public StackObj { 374 private: 375 enum { 376 io_buffer_size = 8*M 377 }; 378 379 int _fd; // file descriptor (-1 if dump file not open) 380 jlong _bytes_written; // number of byte written to dump file 381 382 char* _buffer; // internal buffer 383 int _size; 384 int _pos; 385 386 char* _error; // error message when I/O fails 387 388 void set_file_descriptor(int fd) { _fd = fd; } 389 int file_descriptor() const { return _fd; } 390 391 char* buffer() const { return _buffer; } 392 int buffer_size() const { return _size; } 393 int position() const { return _pos; } 394 void set_position(int pos) { _pos = pos; } 395 396 void set_error(const char* error) { _error = (char*)os::strdup(error); } 397 398 // all I/O go through this function 399 void write_internal(void* s, int len); 400 401 public: 402 DumpWriter(const char* path); 403 ~DumpWriter(); 404 405 void close(); 406 bool is_open() const { return file_descriptor() >= 0; } 407 void flush(); 408 409 // total number of bytes written to the disk 410 jlong bytes_written() const { return _bytes_written; } 411 412 // adjust the number of bytes written to disk (used to keep the count 413 // of the number of bytes written in case of rewrites) 414 void adjust_bytes_written(jlong n) { _bytes_written += n; } 415 416 // number of (buffered) bytes as yet unwritten to the dump file 417 jlong bytes_unwritten() const { return (jlong)position(); } 418 419 char* error() const { return _error; } 420 421 jlong current_offset(); 422 void seek_to_offset(jlong pos); 423 424 // writer functions 425 void write_raw(void* s, int len); 426 void write_u1(u1 x) { write_raw((void*)&x, 1); } 427 void write_u2(u2 x); 428 void write_u4(u4 x); 429 void write_u8(u8 x); 430 void write_objectID(oop o); 431 void write_symbolID(Symbol* o); 432 void write_classID(Klass* k); 433 void write_id(u4 x); 434 }; 435 436 DumpWriter::DumpWriter(const char* path) { 437 // try to allocate an I/O buffer of io_buffer_size. If there isn't 438 // sufficient memory then reduce size until we can allocate something. 439 _size = io_buffer_size; 440 do { 441 _buffer = (char*)os::malloc(_size, mtInternal); 442 if (_buffer == NULL) { 443 _size = _size >> 1; 444 } 445 } while (_buffer == NULL && _size > 0); 446 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 447 _pos = 0; 448 _error = NULL; 449 _bytes_written = 0L; 450 _fd = os::create_binary_file(path, false); // don't replace existing file 451 452 // if the open failed we record the error 453 if (_fd < 0) { 454 _error = (char*)os::strdup(strerror(errno)); 455 } 456 } 457 458 DumpWriter::~DumpWriter() { 459 // flush and close dump file 460 if (is_open()) { 461 close(); 462 } 463 if (_buffer != NULL) os::free(_buffer); 464 if (_error != NULL) os::free(_error); 465 } 466 467 // closes dump file (if open) 468 void DumpWriter::close() { 469 // flush and close dump file 470 if (is_open()) { 471 flush(); 472 ::close(file_descriptor()); 473 set_file_descriptor(-1); 474 } 475 } 476 477 // write directly to the file 478 void DumpWriter::write_internal(void* s, int len) { 479 if (is_open()) { 480 int n = ::write(file_descriptor(), s, len); 481 if (n > 0) { 482 _bytes_written += n; 483 } 484 if (n != len) { 485 if (n < 0) { 486 set_error(strerror(errno)); 487 } else { 488 set_error("file size limit"); 489 } 490 ::close(file_descriptor()); 491 set_file_descriptor(-1); 492 } 493 } 494 } 495 496 // write raw bytes 497 void DumpWriter::write_raw(void* s, int len) { 498 if (is_open()) { 499 // flush buffer to make toom 500 if ((position()+ len) >= buffer_size()) { 501 flush(); 502 } 503 504 // buffer not available or too big to buffer it 505 if ((buffer() == NULL) || (len >= buffer_size())) { 506 write_internal(s, len); 507 } else { 508 // Should optimize this for u1/u2/u4/u8 sizes. 509 memcpy(buffer() + position(), s, len); 510 set_position(position() + len); 511 } 512 } 513 } 514 515 // flush any buffered bytes to the file 516 void DumpWriter::flush() { 517 if (is_open() && position() > 0) { 518 write_internal(buffer(), position()); 519 set_position(0); 520 } 521 } 522 523 524 jlong DumpWriter::current_offset() { 525 if (is_open()) { 526 // the offset is the file offset plus whatever we have buffered 527 jlong offset = os::current_file_offset(file_descriptor()); 528 assert(offset >= 0, "lseek failed"); 529 return offset + (jlong)position(); 530 } else { 531 return (jlong)-1; 532 } 533 } 534 535 void DumpWriter::seek_to_offset(jlong off) { 536 assert(off >= 0, "bad offset"); 537 538 // need to flush before seeking 539 flush(); 540 541 // may be closed due to I/O error 542 if (is_open()) { 543 jlong n = os::seek_to_file_offset(file_descriptor(), off); 544 assert(n >= 0, "lseek failed"); 545 } 546 } 547 548 void DumpWriter::write_u2(u2 x) { 549 u2 v; 550 Bytes::put_Java_u2((address)&v, x); 551 write_raw((void*)&v, 2); 552 } 553 554 void DumpWriter::write_u4(u4 x) { 555 u4 v; 556 Bytes::put_Java_u4((address)&v, x); 557 write_raw((void*)&v, 4); 558 } 559 560 void DumpWriter::write_u8(u8 x) { 561 u8 v; 562 Bytes::put_Java_u8((address)&v, x); 563 write_raw((void*)&v, 8); 564 } 565 566 void DumpWriter::write_objectID(oop o) { 567 address a = (address)o; 568 #ifdef _LP64 569 write_u8((u8)a); 570 #else 571 write_u4((u4)a); 572 #endif 573 } 574 575 void DumpWriter::write_symbolID(Symbol* s) { 576 address a = (address)((uintptr_t)s); 577 #ifdef _LP64 578 write_u8((u8)a); 579 #else 580 write_u4((u4)a); 581 #endif 582 } 583 584 void DumpWriter::write_id(u4 x) { 585 #ifdef _LP64 586 write_u8((u8) x); 587 #else 588 write_u4(x); 589 #endif 590 } 591 592 // We use java mirror as the class ID 593 void DumpWriter::write_classID(Klass* k) { 594 write_objectID(k->java_mirror()); 595 } 596 597 598 599 // Support class with a collection of functions used when dumping the heap 600 601 class DumperSupport : AllStatic { 602 public: 603 604 // write a header of the given type 605 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 606 607 // returns hprof tag for the given type signature 608 static hprofTag sig2tag(Symbol* sig); 609 // returns hprof tag for the given basic type 610 static hprofTag type2tag(BasicType type); 611 612 // returns the size of the instance of the given class 613 static u4 instance_size(Klass* k); 614 615 // dump a jfloat 616 static void dump_float(DumpWriter* writer, jfloat f); 617 // dump a jdouble 618 static void dump_double(DumpWriter* writer, jdouble d); 619 // dumps the raw value of the given field 620 static void dump_field_value(DumpWriter* writer, char type, address addr); 621 // dumps static fields of the given class 622 static void dump_static_fields(DumpWriter* writer, Klass* k); 623 // dump the raw values of the instance fields of the given object 624 static void dump_instance_fields(DumpWriter* writer, oop o); 625 // dumps the definition of the instance fields for a given class 626 static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k); 627 // creates HPROF_GC_INSTANCE_DUMP record for the given object 628 static void dump_instance(DumpWriter* writer, oop o); 629 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 630 // array classes 631 static void dump_class_and_array_classes(DumpWriter* writer, Klass* k); 632 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 633 // class (and each multi-dimensional array class too) 634 static void dump_basic_type_array_class(DumpWriter* writer, Klass* k); 635 636 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 637 static void dump_object_array(DumpWriter* writer, objArrayOop array); 638 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 639 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 640 // create HPROF_FRAME record for the given method and bci 641 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci); 642 }; 643 644 // write a header of the given type 645 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 646 writer->write_u1((u1)tag); 647 writer->write_u4(0); // current ticks 648 writer->write_u4(len); 649 } 650 651 // returns hprof tag for the given type signature 652 hprofTag DumperSupport::sig2tag(Symbol* sig) { 653 switch (sig->byte_at(0)) { 654 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 655 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 656 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 657 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 658 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 659 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 660 case JVM_SIGNATURE_INT : return HPROF_INT; 661 case JVM_SIGNATURE_LONG : return HPROF_LONG; 662 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 663 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 664 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 665 } 666 } 667 668 hprofTag DumperSupport::type2tag(BasicType type) { 669 switch (type) { 670 case T_BYTE : return HPROF_BYTE; 671 case T_CHAR : return HPROF_CHAR; 672 case T_FLOAT : return HPROF_FLOAT; 673 case T_DOUBLE : return HPROF_DOUBLE; 674 case T_INT : return HPROF_INT; 675 case T_LONG : return HPROF_LONG; 676 case T_SHORT : return HPROF_SHORT; 677 case T_BOOLEAN : return HPROF_BOOLEAN; 678 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 679 } 680 } 681 682 // dump a jfloat 683 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 684 if (g_isnan(f)) { 685 writer->write_u4(0x7fc00000); // collapsing NaNs 686 } else { 687 union { 688 int i; 689 float f; 690 } u; 691 u.f = (float)f; 692 writer->write_u4((u4)u.i); 693 } 694 } 695 696 // dump a jdouble 697 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 698 union { 699 jlong l; 700 double d; 701 } u; 702 if (g_isnan(d)) { // collapsing NaNs 703 u.l = (jlong)(0x7ff80000); 704 u.l = (u.l << 32); 705 } else { 706 u.d = (double)d; 707 } 708 writer->write_u8((u8)u.l); 709 } 710 711 // dumps the raw value of the given field 712 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 713 switch (type) { 714 case JVM_SIGNATURE_CLASS : 715 case JVM_SIGNATURE_ARRAY : { 716 oop o; 717 if (UseCompressedOops) { 718 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 719 } else { 720 o = oopDesc::load_decode_heap_oop((oop*)addr); 721 } 722 723 // reflection and sun.misc.Unsafe classes may have a reference to a 724 // Klass* so filter it out. 725 assert(o->is_oop_or_null(), "should always be an oop"); 726 writer->write_objectID(o); 727 break; 728 } 729 case JVM_SIGNATURE_BYTE : { 730 jbyte* b = (jbyte*)addr; 731 writer->write_u1((u1)*b); 732 break; 733 } 734 case JVM_SIGNATURE_CHAR : { 735 jchar* c = (jchar*)addr; 736 writer->write_u2((u2)*c); 737 break; 738 } 739 case JVM_SIGNATURE_SHORT : { 740 jshort* s = (jshort*)addr; 741 writer->write_u2((u2)*s); 742 break; 743 } 744 case JVM_SIGNATURE_FLOAT : { 745 jfloat* f = (jfloat*)addr; 746 dump_float(writer, *f); 747 break; 748 } 749 case JVM_SIGNATURE_DOUBLE : { 750 jdouble* f = (jdouble*)addr; 751 dump_double(writer, *f); 752 break; 753 } 754 case JVM_SIGNATURE_INT : { 755 jint* i = (jint*)addr; 756 writer->write_u4((u4)*i); 757 break; 758 } 759 case JVM_SIGNATURE_LONG : { 760 jlong* l = (jlong*)addr; 761 writer->write_u8((u8)*l); 762 break; 763 } 764 case JVM_SIGNATURE_BOOLEAN : { 765 jboolean* b = (jboolean*)addr; 766 writer->write_u1((u1)*b); 767 break; 768 } 769 default : ShouldNotReachHere(); 770 } 771 } 772 773 // returns the size of the instance of the given class 774 u4 DumperSupport::instance_size(Klass* k) { 775 HandleMark hm; 776 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 777 778 int size = 0; 779 780 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 781 if (!fld.access_flags().is_static()) { 782 Symbol* sig = fld.signature(); 783 switch (sig->byte_at(0)) { 784 case JVM_SIGNATURE_CLASS : 785 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 786 787 case JVM_SIGNATURE_BYTE : 788 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 789 790 case JVM_SIGNATURE_CHAR : 791 case JVM_SIGNATURE_SHORT : size += 2; break; 792 793 case JVM_SIGNATURE_INT : 794 case JVM_SIGNATURE_FLOAT : size += 4; break; 795 796 case JVM_SIGNATURE_LONG : 797 case JVM_SIGNATURE_DOUBLE : size += 8; break; 798 799 default : ShouldNotReachHere(); 800 } 801 } 802 } 803 return (u4)size; 804 } 805 806 // dumps static fields of the given class 807 void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) { 808 HandleMark hm; 809 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 810 811 // pass 1 - count the static fields 812 u2 field_count = 0; 813 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 814 if (fldc.access_flags().is_static()) field_count++; 815 } 816 817 writer->write_u2(field_count); 818 819 // pass 2 - dump the field descriptors and raw values 820 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 821 if (fld.access_flags().is_static()) { 822 Symbol* sig = fld.signature(); 823 824 writer->write_symbolID(fld.name()); // name 825 writer->write_u1(sig2tag(sig)); // type 826 827 // value 828 int offset = fld.offset(); 829 address addr = (address)ikh->java_mirror() + offset; 830 831 dump_field_value(writer, sig->byte_at(0), addr); 832 } 833 } 834 } 835 836 // dump the raw values of the instance fields of the given object 837 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 838 HandleMark hm; 839 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 840 841 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 842 if (!fld.access_flags().is_static()) { 843 Symbol* sig = fld.signature(); 844 address addr = (address)o + fld.offset(); 845 846 dump_field_value(writer, sig->byte_at(0), addr); 847 } 848 } 849 } 850 851 // dumps the definition of the instance fields for a given class 852 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) { 853 HandleMark hm; 854 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 855 856 // pass 1 - count the instance fields 857 u2 field_count = 0; 858 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 859 if (!fldc.access_flags().is_static()) field_count++; 860 } 861 862 writer->write_u2(field_count); 863 864 // pass 2 - dump the field descriptors 865 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 866 if (!fld.access_flags().is_static()) { 867 Symbol* sig = fld.signature(); 868 869 writer->write_symbolID(fld.name()); // name 870 writer->write_u1(sig2tag(sig)); // type 871 } 872 } 873 } 874 875 // creates HPROF_GC_INSTANCE_DUMP record for the given object 876 void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 877 Klass* k = o->klass(); 878 879 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 880 writer->write_objectID(o); 881 writer->write_u4(STACK_TRACE_ID); 882 883 // class ID 884 writer->write_classID(k); 885 886 // number of bytes that follow 887 writer->write_u4(instance_size(k) ); 888 889 // field values 890 dump_instance_fields(writer, o); 891 } 892 893 // creates HPROF_GC_CLASS_DUMP record for the given class and each of 894 // its array classes 895 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) { 896 Klass* klass = k; 897 assert(klass->oop_is_instance(), "not an InstanceKlass"); 898 InstanceKlass* ik = (InstanceKlass*)klass; 899 900 writer->write_u1(HPROF_GC_CLASS_DUMP); 901 902 // class ID 903 writer->write_classID(ik); 904 writer->write_u4(STACK_TRACE_ID); 905 906 // super class ID 907 Klass* java_super = ik->java_super(); 908 if (java_super == NULL) { 909 writer->write_objectID(oop(NULL)); 910 } else { 911 writer->write_classID(java_super); 912 } 913 914 writer->write_objectID(ik->class_loader()); 915 writer->write_objectID(ik->signers()); 916 writer->write_objectID(ik->protection_domain()); 917 918 // reserved 919 writer->write_objectID(oop(NULL)); 920 writer->write_objectID(oop(NULL)); 921 922 // instance size 923 writer->write_u4(DumperSupport::instance_size(k)); 924 925 // size of constant pool - ignored by HAT 1.1 926 writer->write_u2(0); 927 928 // number of static fields 929 dump_static_fields(writer, k); 930 931 // description of instance fields 932 dump_instance_field_descriptors(writer, k); 933 934 // array classes 935 k = klass->array_klass_or_null(); 936 while (k != NULL) { 937 Klass* klass = k; 938 assert(klass->oop_is_objArray(), "not an ObjArrayKlass"); 939 940 writer->write_u1(HPROF_GC_CLASS_DUMP); 941 writer->write_classID(klass); 942 writer->write_u4(STACK_TRACE_ID); 943 944 // super class of array classes is java.lang.Object 945 java_super = klass->java_super(); 946 assert(java_super != NULL, "checking"); 947 writer->write_classID(java_super); 948 949 writer->write_objectID(ik->class_loader()); 950 writer->write_objectID(ik->signers()); 951 writer->write_objectID(ik->protection_domain()); 952 953 writer->write_objectID(oop(NULL)); // reserved 954 writer->write_objectID(oop(NULL)); 955 writer->write_u4(0); // instance size 956 writer->write_u2(0); // constant pool 957 writer->write_u2(0); // static fields 958 writer->write_u2(0); // instance fields 959 960 // get the array class for the next rank 961 k = klass->array_klass_or_null(); 962 } 963 } 964 965 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 966 // class (and each multi-dimensional array class too) 967 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) { 968 // array classes 969 while (k != NULL) { 970 Klass* klass = k; 971 972 writer->write_u1(HPROF_GC_CLASS_DUMP); 973 writer->write_classID(klass); 974 writer->write_u4(STACK_TRACE_ID); 975 976 // super class of array classes is java.lang.Object 977 Klass* java_super = klass->java_super(); 978 assert(java_super != NULL, "checking"); 979 writer->write_classID(java_super); 980 981 writer->write_objectID(oop(NULL)); // loader 982 writer->write_objectID(oop(NULL)); // signers 983 writer->write_objectID(oop(NULL)); // protection domain 984 985 writer->write_objectID(oop(NULL)); // reserved 986 writer->write_objectID(oop(NULL)); 987 writer->write_u4(0); // instance size 988 writer->write_u2(0); // constant pool 989 writer->write_u2(0); // static fields 990 writer->write_u2(0); // instance fields 991 992 // get the array class for the next rank 993 k = klass->array_klass_or_null(); 994 } 995 } 996 997 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 998 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 999 1000 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 1001 writer->write_objectID(array); 1002 writer->write_u4(STACK_TRACE_ID); 1003 writer->write_u4((u4)array->length()); 1004 1005 // array class ID 1006 writer->write_classID(array->klass()); 1007 1008 // [id]* elements 1009 for (int index=0; index<array->length(); index++) { 1010 oop o = array->obj_at(index); 1011 writer->write_objectID(o); 1012 } 1013 } 1014 1015 #define WRITE_ARRAY(Array, Type, Size) \ 1016 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); } 1017 1018 1019 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1020 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1021 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); 1022 1023 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1024 writer->write_objectID(array); 1025 writer->write_u4(STACK_TRACE_ID); 1026 writer->write_u4((u4)array->length()); 1027 writer->write_u1(type2tag(type)); 1028 1029 // nothing to copy 1030 if (array->length() == 0) { 1031 return; 1032 } 1033 1034 // If the byte ordering is big endian then we can copy most types directly 1035 int length_in_bytes = array->length() * type2aelembytes(type); 1036 assert(length_in_bytes > 0, "nothing to copy"); 1037 1038 switch (type) { 1039 case T_INT : { 1040 if (Bytes::is_Java_byte_ordering_different()) { 1041 WRITE_ARRAY(array, int, u4); 1042 } else { 1043 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1044 } 1045 break; 1046 } 1047 case T_BYTE : { 1048 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1049 break; 1050 } 1051 case T_CHAR : { 1052 if (Bytes::is_Java_byte_ordering_different()) { 1053 WRITE_ARRAY(array, char, u2); 1054 } else { 1055 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1056 } 1057 break; 1058 } 1059 case T_SHORT : { 1060 if (Bytes::is_Java_byte_ordering_different()) { 1061 WRITE_ARRAY(array, short, u2); 1062 } else { 1063 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1064 } 1065 break; 1066 } 1067 case T_BOOLEAN : { 1068 if (Bytes::is_Java_byte_ordering_different()) { 1069 WRITE_ARRAY(array, bool, u1); 1070 } else { 1071 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1072 } 1073 break; 1074 } 1075 case T_LONG : { 1076 if (Bytes::is_Java_byte_ordering_different()) { 1077 WRITE_ARRAY(array, long, u8); 1078 } else { 1079 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1080 } 1081 break; 1082 } 1083 1084 // handle float/doubles in a special value to ensure than NaNs are 1085 // written correctly. TO DO: Check if we can avoid this on processors that 1086 // use IEEE 754. 1087 1088 case T_FLOAT : { 1089 for (int i=0; i<array->length(); i++) { 1090 dump_float( writer, array->float_at(i) ); 1091 } 1092 break; 1093 } 1094 case T_DOUBLE : { 1095 for (int i=0; i<array->length(); i++) { 1096 dump_double( writer, array->double_at(i) ); 1097 } 1098 break; 1099 } 1100 default : ShouldNotReachHere(); 1101 } 1102 } 1103 1104 // create a HPROF_FRAME record of the given Method* and bci 1105 void DumperSupport::dump_stack_frame(DumpWriter* writer, 1106 int frame_serial_num, 1107 int class_serial_num, 1108 Method* m, 1109 int bci) { 1110 int line_number; 1111 if (m->is_native()) { 1112 line_number = -3; // native frame 1113 } else { 1114 line_number = m->line_number_from_bci(bci); 1115 } 1116 1117 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1118 writer->write_id(frame_serial_num); // frame serial number 1119 writer->write_symbolID(m->name()); // method's name 1120 writer->write_symbolID(m->signature()); // method's signature 1121 1122 assert(m->method_holder()->oop_is_instance(), "not InstanceKlass"); 1123 writer->write_symbolID(m->method_holder()->source_file_name()); // source file name 1124 writer->write_u4(class_serial_num); // class serial number 1125 writer->write_u4((u4) line_number); // line number 1126 } 1127 1128 1129 // Support class used to generate HPROF_UTF8 records from the entries in the 1130 // SymbolTable. 1131 1132 class SymbolTableDumper : public SymbolClosure { 1133 private: 1134 DumpWriter* _writer; 1135 DumpWriter* writer() const { return _writer; } 1136 public: 1137 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1138 void do_symbol(Symbol** p); 1139 }; 1140 1141 void SymbolTableDumper::do_symbol(Symbol** p) { 1142 ResourceMark rm; 1143 Symbol* sym = load_symbol(p); 1144 int len = sym->utf8_length(); 1145 if (len > 0) { 1146 char* s = sym->as_utf8(); 1147 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1148 writer()->write_symbolID(sym); 1149 writer()->write_raw(s, len); 1150 } 1151 } 1152 1153 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1154 1155 class JNILocalsDumper : public OopClosure { 1156 private: 1157 DumpWriter* _writer; 1158 u4 _thread_serial_num; 1159 int _frame_num; 1160 DumpWriter* writer() const { return _writer; } 1161 public: 1162 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1163 _writer = writer; 1164 _thread_serial_num = thread_serial_num; 1165 _frame_num = -1; // default - empty stack 1166 } 1167 void set_frame_number(int n) { _frame_num = n; } 1168 void do_oop(oop* obj_p); 1169 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1170 }; 1171 1172 1173 void JNILocalsDumper::do_oop(oop* obj_p) { 1174 // ignore null or deleted handles 1175 oop o = *obj_p; 1176 if (o != NULL && o != JNIHandles::deleted_handle()) { 1177 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1178 writer()->write_objectID(o); 1179 writer()->write_u4(_thread_serial_num); 1180 writer()->write_u4((u4)_frame_num); 1181 } 1182 } 1183 1184 1185 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1186 1187 class JNIGlobalsDumper : public OopClosure { 1188 private: 1189 DumpWriter* _writer; 1190 DumpWriter* writer() const { return _writer; } 1191 1192 public: 1193 JNIGlobalsDumper(DumpWriter* writer) { 1194 _writer = writer; 1195 } 1196 void do_oop(oop* obj_p); 1197 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1198 }; 1199 1200 void JNIGlobalsDumper::do_oop(oop* obj_p) { 1201 oop o = *obj_p; 1202 1203 // ignore these 1204 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1205 1206 // we ignore global ref to symbols and other internal objects 1207 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1208 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1209 writer()->write_objectID(o); 1210 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1211 } 1212 }; 1213 1214 1215 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1216 1217 class MonitorUsedDumper : public OopClosure { 1218 private: 1219 DumpWriter* _writer; 1220 DumpWriter* writer() const { return _writer; } 1221 public: 1222 MonitorUsedDumper(DumpWriter* writer) { 1223 _writer = writer; 1224 } 1225 void do_oop(oop* obj_p) { 1226 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1227 writer()->write_objectID(*obj_p); 1228 } 1229 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1230 }; 1231 1232 1233 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1234 1235 class StickyClassDumper : public KlassClosure { 1236 private: 1237 DumpWriter* _writer; 1238 DumpWriter* writer() const { return _writer; } 1239 public: 1240 StickyClassDumper(DumpWriter* writer) { 1241 _writer = writer; 1242 } 1243 void do_klass(Klass* k) { 1244 if (k->oop_is_instance()) { 1245 InstanceKlass* ik = InstanceKlass::cast(k); 1246 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1247 writer()->write_classID(ik); 1248 } 1249 } 1250 }; 1251 1252 1253 class VM_HeapDumper; 1254 1255 // Support class using when iterating over the heap. 1256 1257 class HeapObjectDumper : public ObjectClosure { 1258 private: 1259 VM_HeapDumper* _dumper; 1260 DumpWriter* _writer; 1261 1262 VM_HeapDumper* dumper() { return _dumper; } 1263 DumpWriter* writer() { return _writer; } 1264 1265 // used to indicate that a record has been writen 1266 void mark_end_of_record(); 1267 1268 public: 1269 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1270 _dumper = dumper; 1271 _writer = writer; 1272 } 1273 1274 // called for each object in the heap 1275 void do_object(oop o); 1276 }; 1277 1278 void HeapObjectDumper::do_object(oop o) { 1279 // hide the sentinel for deleted handles 1280 if (o == JNIHandles::deleted_handle()) return; 1281 1282 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1283 if (o->klass() == SystemDictionary::Class_klass()) { 1284 if (!java_lang_Class::is_primitive(o)) { 1285 return; 1286 } 1287 } 1288 1289 // create a HPROF_GC_INSTANCE record for each object 1290 if (o->is_instance()) { 1291 DumperSupport::dump_instance(writer(), o); 1292 mark_end_of_record(); 1293 } else { 1294 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1295 if (o->is_objArray()) { 1296 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1297 mark_end_of_record(); 1298 } else { 1299 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1300 if (o->is_typeArray()) { 1301 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1302 mark_end_of_record(); 1303 } 1304 } 1305 } 1306 } 1307 1308 // The VM operation that performs the heap dump 1309 class VM_HeapDumper : public VM_GC_Operation { 1310 private: 1311 static VM_HeapDumper* _global_dumper; 1312 static DumpWriter* _global_writer; 1313 DumpWriter* _local_writer; 1314 JavaThread* _oome_thread; 1315 Method* _oome_constructor; 1316 bool _gc_before_heap_dump; 1317 bool _is_segmented_dump; 1318 jlong _dump_start; 1319 GrowableArray<Klass*>* _klass_map; 1320 ThreadStackTrace** _stack_traces; 1321 int _num_threads; 1322 1323 // accessors and setters 1324 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1325 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1326 void set_global_dumper() { 1327 assert(_global_dumper == NULL, "Error"); 1328 _global_dumper = this; 1329 } 1330 void set_global_writer() { 1331 assert(_global_writer == NULL, "Error"); 1332 _global_writer = _local_writer; 1333 } 1334 void clear_global_dumper() { _global_dumper = NULL; } 1335 void clear_global_writer() { _global_writer = NULL; } 1336 1337 bool is_segmented_dump() const { return _is_segmented_dump; } 1338 void set_segmented_dump() { _is_segmented_dump = true; } 1339 jlong dump_start() const { return _dump_start; } 1340 void set_dump_start(jlong pos); 1341 1342 bool skip_operation() const; 1343 1344 // writes a HPROF_LOAD_CLASS record 1345 static void do_load_class(Klass* k); 1346 1347 // writes a HPROF_GC_CLASS_DUMP record for the given class 1348 // (and each array class too) 1349 static void do_class_dump(Klass* k); 1350 1351 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1352 // array (and each multi-dimensional array too) 1353 static void do_basic_type_array_class_dump(Klass* k); 1354 1355 // HPROF_GC_ROOT_THREAD_OBJ records 1356 int do_thread(JavaThread* thread, u4 thread_serial_num); 1357 void do_threads(); 1358 1359 void add_class_serial_number(Klass* k, int serial_num) { 1360 _klass_map->at_put_grow(serial_num, k); 1361 } 1362 1363 // HPROF_TRACE and HPROF_FRAME records 1364 void dump_stack_traces(); 1365 1366 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1367 void write_dump_header(); 1368 1369 // fixes up the length of the current dump record 1370 void write_current_dump_record_length(); 1371 1372 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1373 // record in the case of a segmented heap dump) 1374 void end_of_dump(); 1375 1376 public: 1377 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1378 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1379 GCCause::_heap_dump /* GC Cause */, 1380 0 /* total full collections, dummy, ignored */, 1381 gc_before_heap_dump) { 1382 _local_writer = writer; 1383 _gc_before_heap_dump = gc_before_heap_dump; 1384 _is_segmented_dump = false; 1385 _dump_start = (jlong)-1; 1386 _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1387 _stack_traces = NULL; 1388 _num_threads = 0; 1389 if (oome) { 1390 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1391 // get OutOfMemoryError zero-parameter constructor 1392 InstanceKlass* oome_ik = InstanceKlass::cast(SystemDictionary::OutOfMemoryError_klass()); 1393 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1394 vmSymbols::void_method_signature()); 1395 // get thread throwing OOME when generating the heap dump at OOME 1396 _oome_thread = JavaThread::current(); 1397 } else { 1398 _oome_thread = NULL; 1399 _oome_constructor = NULL; 1400 } 1401 } 1402 ~VM_HeapDumper() { 1403 if (_stack_traces != NULL) { 1404 for (int i=0; i < _num_threads; i++) { 1405 delete _stack_traces[i]; 1406 } 1407 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces, mtInternal); 1408 } 1409 delete _klass_map; 1410 } 1411 1412 VMOp_Type type() const { return VMOp_HeapDumper; } 1413 // used to mark sub-record boundary 1414 void check_segment_length(); 1415 void doit(); 1416 }; 1417 1418 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1419 DumpWriter* VM_HeapDumper::_global_writer = NULL; 1420 1421 bool VM_HeapDumper::skip_operation() const { 1422 return false; 1423 } 1424 1425 // sets the dump starting position 1426 void VM_HeapDumper::set_dump_start(jlong pos) { 1427 _dump_start = pos; 1428 } 1429 1430 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1431 void VM_HeapDumper::write_dump_header() { 1432 if (writer()->is_open()) { 1433 if (is_segmented_dump()) { 1434 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1435 } else { 1436 writer()->write_u1(HPROF_HEAP_DUMP); 1437 } 1438 writer()->write_u4(0); // current ticks 1439 1440 // record the starting position for the dump (its length will be fixed up later) 1441 set_dump_start(writer()->current_offset()); 1442 writer()->write_u4(0); 1443 } 1444 } 1445 1446 // fixes up the length of the current dump record 1447 void VM_HeapDumper::write_current_dump_record_length() { 1448 if (writer()->is_open()) { 1449 assert(dump_start() >= 0, "no dump start recorded"); 1450 1451 // calculate the size of the dump record 1452 jlong dump_end = writer()->current_offset(); 1453 jlong dump_len = (dump_end - dump_start() - 4); 1454 1455 // record length must fit in a u4 1456 if (dump_len > (jlong)(4L*(jlong)G)) { 1457 warning("record is too large"); 1458 } 1459 1460 // seek to the dump start and fix-up the length 1461 writer()->seek_to_offset(dump_start()); 1462 writer()->write_u4((u4)dump_len); 1463 1464 // adjust the total size written to keep the bytes written correct. 1465 writer()->adjust_bytes_written(-((long) sizeof(u4))); 1466 1467 // seek to dump end so we can continue 1468 writer()->seek_to_offset(dump_end); 1469 1470 // no current dump record 1471 set_dump_start((jlong)-1); 1472 } 1473 } 1474 1475 // used on a sub-record boundary to check if we need to start a 1476 // new segment. 1477 void VM_HeapDumper::check_segment_length() { 1478 if (writer()->is_open()) { 1479 if (is_segmented_dump()) { 1480 // don't use current_offset that would be too expensive on a per record basis 1481 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten(); 1482 assert(dump_end == writer()->current_offset(), "checking"); 1483 jlong dump_len = (dump_end - dump_start() - 4); 1484 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length"); 1485 1486 if (dump_len > (jlong)HeapDumpSegmentSize) { 1487 write_current_dump_record_length(); 1488 write_dump_header(); 1489 } 1490 } 1491 } 1492 } 1493 1494 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1495 // record in the case of a segmented heap dump) 1496 void VM_HeapDumper::end_of_dump() { 1497 if (writer()->is_open()) { 1498 write_current_dump_record_length(); 1499 1500 // for segmented dump we write the end record 1501 if (is_segmented_dump()) { 1502 writer()->write_u1(HPROF_HEAP_DUMP_END); 1503 writer()->write_u4(0); 1504 writer()->write_u4(0); 1505 } 1506 } 1507 } 1508 1509 // marks sub-record boundary 1510 void HeapObjectDumper::mark_end_of_record() { 1511 dumper()->check_segment_length(); 1512 } 1513 1514 // writes a HPROF_LOAD_CLASS record for the class (and each of its 1515 // array classes) 1516 void VM_HeapDumper::do_load_class(Klass* k) { 1517 static u4 class_serial_num = 0; 1518 1519 // len of HPROF_LOAD_CLASS record 1520 u4 remaining = 2*oopSize + 2*sizeof(u4); 1521 1522 // write a HPROF_LOAD_CLASS for the class and each array class 1523 do { 1524 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1525 1526 // class serial number is just a number 1527 writer()->write_u4(++class_serial_num); 1528 1529 // class ID 1530 Klass* klass = k; 1531 writer()->write_classID(klass); 1532 1533 // add the Klass* and class serial number pair 1534 dumper()->add_class_serial_number(klass, class_serial_num); 1535 1536 writer()->write_u4(STACK_TRACE_ID); 1537 1538 // class name ID 1539 Symbol* name = klass->name(); 1540 writer()->write_symbolID(name); 1541 1542 // write a LOAD_CLASS record for the array type (if it exists) 1543 k = klass->array_klass_or_null(); 1544 } while (k != NULL); 1545 } 1546 1547 // writes a HPROF_GC_CLASS_DUMP record for the given class 1548 void VM_HeapDumper::do_class_dump(Klass* k) { 1549 if (k->oop_is_instance()) { 1550 DumperSupport::dump_class_and_array_classes(writer(), k); 1551 } 1552 } 1553 1554 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1555 // array (and each multi-dimensional array too) 1556 void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) { 1557 DumperSupport::dump_basic_type_array_class(writer(), k); 1558 } 1559 1560 // Walk the stack of the given thread. 1561 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1562 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1563 // 1564 // It returns the number of Java frames in this thread stack 1565 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1566 JNILocalsDumper blk(writer(), thread_serial_num); 1567 1568 oop threadObj = java_thread->threadObj(); 1569 assert(threadObj != NULL, "sanity check"); 1570 1571 int stack_depth = 0; 1572 if (java_thread->has_last_Java_frame()) { 1573 1574 // vframes are resource allocated 1575 Thread* current_thread = Thread::current(); 1576 ResourceMark rm(current_thread); 1577 HandleMark hm(current_thread); 1578 1579 RegisterMap reg_map(java_thread); 1580 frame f = java_thread->last_frame(); 1581 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1582 frame* last_entry_frame = NULL; 1583 int extra_frames = 0; 1584 1585 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1586 extra_frames++; 1587 } 1588 while (vf != NULL) { 1589 blk.set_frame_number(stack_depth); 1590 if (vf->is_java_frame()) { 1591 1592 // java frame (interpreted, compiled, ...) 1593 javaVFrame *jvf = javaVFrame::cast(vf); 1594 if (!(jvf->method()->is_native())) { 1595 StackValueCollection* locals = jvf->locals(); 1596 for (int slot=0; slot<locals->size(); slot++) { 1597 if (locals->at(slot)->type() == T_OBJECT) { 1598 oop o = locals->obj_at(slot)(); 1599 1600 if (o != NULL) { 1601 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1602 writer()->write_objectID(o); 1603 writer()->write_u4(thread_serial_num); 1604 writer()->write_u4((u4) (stack_depth + extra_frames)); 1605 } 1606 } 1607 } 1608 StackValueCollection *exprs = jvf->expressions(); 1609 for(int index = 0; index < exprs->size(); index++) { 1610 if (exprs->at(index)->type() == T_OBJECT) { 1611 oop o = exprs->obj_at(index)(); 1612 if (o != NULL) { 1613 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1614 writer()->write_objectID(o); 1615 writer()->write_u4(thread_serial_num); 1616 writer()->write_u4((u4) (stack_depth + extra_frames)); 1617 } 1618 } 1619 } 1620 } else { 1621 // native frame 1622 if (stack_depth == 0) { 1623 // JNI locals for the top frame. 1624 java_thread->active_handles()->oops_do(&blk); 1625 } else { 1626 if (last_entry_frame != NULL) { 1627 // JNI locals for the entry frame 1628 assert(last_entry_frame->is_entry_frame(), "checking"); 1629 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1630 } 1631 } 1632 } 1633 // increment only for Java frames 1634 stack_depth++; 1635 last_entry_frame = NULL; 1636 1637 } else { 1638 // externalVFrame - if it's an entry frame then report any JNI locals 1639 // as roots when we find the corresponding native javaVFrame 1640 frame* fr = vf->frame_pointer(); 1641 assert(fr != NULL, "sanity check"); 1642 if (fr->is_entry_frame()) { 1643 last_entry_frame = fr; 1644 } 1645 } 1646 vf = vf->sender(); 1647 } 1648 } else { 1649 // no last java frame but there may be JNI locals 1650 java_thread->active_handles()->oops_do(&blk); 1651 } 1652 return stack_depth; 1653 } 1654 1655 1656 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1657 // the stack so that locals and JNI locals are dumped. 1658 void VM_HeapDumper::do_threads() { 1659 for (int i=0; i < _num_threads; i++) { 1660 JavaThread* thread = _stack_traces[i]->thread(); 1661 oop threadObj = thread->threadObj(); 1662 u4 thread_serial_num = i+1; 1663 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1664 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1665 writer()->write_objectID(threadObj); 1666 writer()->write_u4(thread_serial_num); // thread number 1667 writer()->write_u4(stack_serial_num); // stack trace serial number 1668 int num_frames = do_thread(thread, thread_serial_num); 1669 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1670 "total number of Java frames not matched"); 1671 } 1672 } 1673 1674 1675 // The VM operation that dumps the heap. The dump consists of the following 1676 // records: 1677 // 1678 // HPROF_HEADER 1679 // [HPROF_UTF8]* 1680 // [HPROF_LOAD_CLASS]* 1681 // [[HPROF_FRAME]*|HPROF_TRACE]* 1682 // [HPROF_GC_CLASS_DUMP]* 1683 // HPROF_HEAP_DUMP 1684 // 1685 // The HPROF_TRACE records represent the stack traces where the heap dump 1686 // is generated and a "dummy trace" record which does not include 1687 // any frames. The dummy trace record is used to be referenced as the 1688 // unknown object alloc site. 1689 // 1690 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow 1691 // the heap dump be generated in a single pass we remember the position of 1692 // the dump length and fix it up after all sub-records have been written. 1693 // To generate the sub-records we iterate over the heap, writing 1694 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1695 // records as we go. Once that is done we write records for some of the GC 1696 // roots. 1697 1698 void VM_HeapDumper::doit() { 1699 1700 HandleMark hm; 1701 CollectedHeap* ch = Universe::heap(); 1702 1703 ch->ensure_parsability(false); // must happen, even if collection does 1704 // not happen (e.g. due to GC_locker) 1705 1706 if (_gc_before_heap_dump) { 1707 if (GC_locker::is_active()) { 1708 warning("GC locker is held; pre-heapdump GC was skipped"); 1709 } else { 1710 ch->collect_as_vm_thread(GCCause::_heap_dump); 1711 } 1712 } 1713 1714 // At this point we should be the only dumper active, so 1715 // the following should be safe. 1716 set_global_dumper(); 1717 set_global_writer(); 1718 1719 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1 1720 size_t used = ch->used(); 1721 const char* header; 1722 if (used > (size_t)SegmentedHeapDumpThreshold) { 1723 set_segmented_dump(); 1724 header = "JAVA PROFILE 1.0.2"; 1725 } else { 1726 header = "JAVA PROFILE 1.0.1"; 1727 } 1728 1729 // header is few bytes long - no chance to overflow int 1730 writer()->write_raw((void*)header, (int)strlen(header)); 1731 writer()->write_u1(0); // terminator 1732 writer()->write_u4(oopSize); 1733 writer()->write_u8(os::javaTimeMillis()); 1734 1735 // HPROF_UTF8 records 1736 SymbolTableDumper sym_dumper(writer()); 1737 SymbolTable::symbols_do(&sym_dumper); 1738 1739 // write HPROF_LOAD_CLASS records 1740 ClassLoaderDataGraph::classes_do(&do_load_class); 1741 Universe::basic_type_classes_do(&do_load_class); 1742 1743 // write HPROF_FRAME and HPROF_TRACE records 1744 // this must be called after _klass_map is built when iterating the classes above. 1745 dump_stack_traces(); 1746 1747 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT 1748 write_dump_header(); 1749 1750 // Writes HPROF_GC_CLASS_DUMP records 1751 ClassLoaderDataGraph::classes_do(&do_class_dump); 1752 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1753 check_segment_length(); 1754 1755 // writes HPROF_GC_INSTANCE_DUMP records. 1756 // After each sub-record is written check_segment_length will be invoked. When 1757 // generated a segmented heap dump this allows us to check if the current 1758 // segment exceeds a threshold and if so, then a new segment is started. 1759 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1760 // of the heap dump. 1761 HeapObjectDumper obj_dumper(this, writer()); 1762 Universe::heap()->safe_object_iterate(&obj_dumper); 1763 1764 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1765 do_threads(); 1766 check_segment_length(); 1767 1768 // HPROF_GC_ROOT_MONITOR_USED 1769 MonitorUsedDumper mon_dumper(writer()); 1770 ObjectSynchronizer::oops_do(&mon_dumper); 1771 check_segment_length(); 1772 1773 // HPROF_GC_ROOT_JNI_GLOBAL 1774 JNIGlobalsDumper jni_dumper(writer()); 1775 JNIHandles::oops_do(&jni_dumper); 1776 check_segment_length(); 1777 1778 // HPROF_GC_ROOT_STICKY_CLASS 1779 StickyClassDumper class_dumper(writer()); 1780 SystemDictionary::always_strong_classes_do(&class_dumper); 1781 1782 // fixes up the length of the dump record. In the case of a segmented 1783 // heap then the HPROF_HEAP_DUMP_END record is also written. 1784 end_of_dump(); 1785 1786 // Now we clear the global variables, so that a future dumper might run. 1787 clear_global_dumper(); 1788 clear_global_writer(); 1789 } 1790 1791 void VM_HeapDumper::dump_stack_traces() { 1792 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1793 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1794 writer()->write_u4((u4) STACK_TRACE_ID); 1795 writer()->write_u4(0); // thread number 1796 writer()->write_u4(0); // frame count 1797 1798 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal); 1799 int frame_serial_num = 0; 1800 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1801 oop threadObj = thread->threadObj(); 1802 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1803 // dump thread stack trace 1804 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1805 stack_trace->dump_stack_at_safepoint(-1); 1806 _stack_traces[_num_threads++] = stack_trace; 1807 1808 // write HPROF_FRAME records for this thread's stack trace 1809 int depth = stack_trace->get_stack_depth(); 1810 int thread_frame_start = frame_serial_num; 1811 int extra_frames = 0; 1812 // write fake frame that makes it look like the thread, which caused OOME, 1813 // is in the OutOfMemoryError zero-parameter constructor 1814 if (thread == _oome_thread && _oome_constructor != NULL) { 1815 int oome_serial_num = _klass_map->find(_oome_constructor->method_holder()); 1816 // the class serial number starts from 1 1817 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1818 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1819 _oome_constructor, 0); 1820 extra_frames++; 1821 } 1822 for (int j=0; j < depth; j++) { 1823 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1824 Method* m = frame->method(); 1825 int class_serial_num = _klass_map->find(m->method_holder()); 1826 // the class serial number starts from 1 1827 assert(class_serial_num > 0, "class not found"); 1828 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1829 } 1830 depth += extra_frames; 1831 1832 // write HPROF_TRACE record for one thread 1833 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1834 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1835 writer()->write_u4(stack_serial_num); // stack trace serial number 1836 writer()->write_u4((u4) _num_threads); // thread serial number 1837 writer()->write_u4(depth); // frame count 1838 for (int j=1; j <= depth; j++) { 1839 writer()->write_id(thread_frame_start + j); 1840 } 1841 } 1842 } 1843 } 1844 1845 // dump the heap to given path. 1846 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL 1847 int HeapDumper::dump(const char* path) { 1848 assert(path != NULL && strlen(path) > 0, "path missing"); 1849 1850 // print message in interactive case 1851 if (print_to_tty()) { 1852 tty->print_cr("Dumping heap to %s ...", path); 1853 timer()->start(); 1854 } 1855 1856 // create the dump writer. If the file can be opened then bail 1857 DumpWriter writer(path); 1858 if (!writer.is_open()) { 1859 set_error(writer.error()); 1860 if (print_to_tty()) { 1861 tty->print_cr("Unable to create %s: %s", path, 1862 (error() != NULL) ? error() : "reason unknown"); 1863 } 1864 return -1; 1865 } 1866 1867 // generate the dump 1868 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1869 if (Thread::current()->is_VM_thread()) { 1870 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1871 dumper.doit(); 1872 } else { 1873 VMThread::execute(&dumper); 1874 } 1875 1876 // close dump file and record any error that the writer may have encountered 1877 writer.close(); 1878 set_error(writer.error()); 1879 1880 // print message in interactive case 1881 if (print_to_tty()) { 1882 timer()->stop(); 1883 if (error() == NULL) { 1884 char msg[256]; 1885 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]", 1886 JLONG_FORMAT, timer()->seconds()); 1887 PRAGMA_DIAG_PUSH 1888 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL 1889 tty->print_cr(msg, writer.bytes_written()); 1890 PRAGMA_DIAG_POP 1891 } else { 1892 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1893 } 1894 } 1895 1896 return (writer.error() == NULL) ? 0 : -1; 1897 } 1898 1899 // stop timer (if still active), and free any error string we might be holding 1900 HeapDumper::~HeapDumper() { 1901 if (timer()->is_active()) { 1902 timer()->stop(); 1903 } 1904 set_error(NULL); 1905 } 1906 1907 1908 // returns the error string (resource allocated), or NULL 1909 char* HeapDumper::error_as_C_string() const { 1910 if (error() != NULL) { 1911 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1912 strcpy(str, error()); 1913 return str; 1914 } else { 1915 return NULL; 1916 } 1917 } 1918 1919 // set the error string 1920 void HeapDumper::set_error(char* error) { 1921 if (_error != NULL) { 1922 os::free(_error); 1923 } 1924 if (error == NULL) { 1925 _error = NULL; 1926 } else { 1927 _error = os::strdup(error); 1928 assert(_error != NULL, "allocation failure"); 1929 } 1930 } 1931 1932 // Called by out-of-memory error reporting by a single Java thread 1933 // outside of a JVM safepoint 1934 void HeapDumper::dump_heap_from_oome() { 1935 HeapDumper::dump_heap(true); 1936 } 1937 1938 // Called by error reporting by a single Java thread outside of a JVM safepoint, 1939 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1940 // callers are strictly serialized and guaranteed not to interfere below. For more 1941 // general use, however, this method will need modification to prevent 1942 // inteference when updating the static variables base_path and dump_file_seq below. 1943 void HeapDumper::dump_heap() { 1944 HeapDumper::dump_heap(false); 1945 } 1946 1947 void HeapDumper::dump_heap(bool oome) { 1948 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1949 static uint dump_file_seq = 0; 1950 char* my_path; 1951 const int max_digit_chars = 20; 1952 1953 const char* dump_file_name = "java_pid"; 1954 const char* dump_file_ext = ".hprof"; 1955 1956 // The dump file defaults to java_pid<pid>.hprof in the current working 1957 // directory. HeapDumpPath=<file> can be used to specify an alternative 1958 // dump file name or a directory where dump file is created. 1959 if (dump_file_seq == 0) { // first time in, we initialize base_path 1960 // Calculate potentially longest base path and check if we have enough 1961 // allocated statically. 1962 const size_t total_length = 1963 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + 1964 strlen(os::file_separator()) + max_digit_chars + 1965 strlen(dump_file_name) + strlen(dump_file_ext) + 1; 1966 if (total_length > sizeof(base_path)) { 1967 warning("Cannot create heap dump file. HeapDumpPath is too long."); 1968 return; 1969 } 1970 1971 bool use_default_filename = true; 1972 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 1973 // HeapDumpPath=<file> not specified 1974 } else { 1975 strncpy(base_path, HeapDumpPath, sizeof(base_path)); 1976 // check if the path is a directory (must exist) 1977 DIR* dir = os::opendir(base_path); 1978 if (dir == NULL) { 1979 use_default_filename = false; 1980 } else { 1981 // HeapDumpPath specified a directory. We append a file separator 1982 // (if needed). 1983 os::closedir(dir); 1984 size_t fs_len = strlen(os::file_separator()); 1985 if (strlen(base_path) >= fs_len) { 1986 char* end = base_path; 1987 end += (strlen(base_path) - fs_len); 1988 if (strcmp(end, os::file_separator()) != 0) { 1989 strcat(base_path, os::file_separator()); 1990 } 1991 } 1992 } 1993 } 1994 // If HeapDumpPath wasn't a file name then we append the default name 1995 if (use_default_filename) { 1996 const size_t dlen = strlen(base_path); // if heap dump dir specified 1997 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", 1998 dump_file_name, os::current_process_id(), dump_file_ext); 1999 } 2000 const size_t len = strlen(base_path) + 1; 2001 my_path = (char*)os::malloc(len, mtInternal); 2002 if (my_path == NULL) { 2003 warning("Cannot create heap dump file. Out of system memory."); 2004 return; 2005 } 2006 strncpy(my_path, base_path, len); 2007 } else { 2008 // Append a sequence number id for dumps following the first 2009 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 2010 my_path = (char*)os::malloc(len, mtInternal); 2011 if (my_path == NULL) { 2012 warning("Cannot create heap dump file. Out of system memory."); 2013 return; 2014 } 2015 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); 2016 } 2017 dump_file_seq++; // increment seq number for next time we dump 2018 2019 HeapDumper dumper(false /* no GC before heap dump */, 2020 true /* send to tty */, 2021 oome /* pass along out-of-memory-error flag */); 2022 dumper.dump(my_path); 2023 os::free(my_path); 2024 }