1 /* 2 * Copyright (c) 2005, 2015, 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/universe.hpp" 33 #include "oops/objArrayKlass.hpp" 34 #include "oops/objArrayOop.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "runtime/javaCalls.hpp" 37 #include "runtime/jniHandles.hpp" 38 #include "runtime/os.hpp" 39 #include "runtime/reflectionUtils.hpp" 40 #include "runtime/vframe.hpp" 41 #include "runtime/vmThread.hpp" 42 #include "runtime/vm_operations.hpp" 43 #include "services/heapDumper.hpp" 44 #include "services/threadService.hpp" 45 #include "utilities/macros.hpp" 46 #include "utilities/ostream.hpp" 47 #if INCLUDE_ALL_GCS 48 #include "gc/parallel/parallelScavengeHeap.hpp" 49 #endif // INCLUDE_ALL_GCS 50 51 /* 52 * HPROF binary format - description copied from: 53 * src/share/demo/jvmti/hprof/hprof_io.c 54 * 55 * 56 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2" 57 * (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 jlong _bytes_written; // number of byte written to dump file 383 384 char* _buffer; // internal buffer 385 int _size; 386 int _pos; 387 388 char* _error; // error message when I/O fails 389 390 void set_file_descriptor(int fd) { _fd = fd; } 391 int file_descriptor() const { return _fd; } 392 393 char* buffer() const { return _buffer; } 394 int buffer_size() const { return _size; } 395 int position() const { return _pos; } 396 void set_position(int pos) { _pos = pos; } 397 398 void set_error(const char* error) { _error = (char*)os::strdup(error); } 399 400 // all I/O go through this function 401 void write_internal(void* s, int len); 402 403 public: 404 DumpWriter(const char* path); 405 ~DumpWriter(); 406 407 void close(); 408 bool is_open() const { return file_descriptor() >= 0; } 409 void flush(); 410 411 // total number of bytes written to the disk 412 jlong bytes_written() const { return _bytes_written; } 413 414 // adjust the number of bytes written to disk (used to keep the count 415 // of the number of bytes written in case of rewrites) 416 void adjust_bytes_written(jlong n) { _bytes_written += n; } 417 418 // number of (buffered) bytes as yet unwritten to the dump file 419 jlong bytes_unwritten() const { return (jlong)position(); } 420 421 char* error() const { return _error; } 422 423 jlong current_offset(); 424 void seek_to_offset(jlong pos); 425 426 // writer functions 427 void write_raw(void* s, int len); 428 void write_u1(u1 x) { write_raw((void*)&x, 1); } 429 void write_u2(u2 x); 430 void write_u4(u4 x); 431 void write_u8(u8 x); 432 void write_objectID(oop o); 433 void write_symbolID(Symbol* o); 434 void write_classID(Klass* k); 435 void write_id(u4 x); 436 }; 437 438 DumpWriter::DumpWriter(const char* path) { 439 // try to allocate an I/O buffer of io_buffer_size. If there isn't 440 // sufficient memory then reduce size until we can allocate something. 441 _size = io_buffer_size; 442 do { 443 _buffer = (char*)os::malloc(_size, mtInternal); 444 if (_buffer == NULL) { 445 _size = _size >> 1; 446 } 447 } while (_buffer == NULL && _size > 0); 448 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 449 _pos = 0; 450 _error = NULL; 451 _bytes_written = 0L; 452 _fd = os::create_binary_file(path, false); // don't replace existing file 453 454 // if the open failed we record the error 455 if (_fd < 0) { 456 _error = (char*)os::strdup(strerror(errno)); 457 } 458 } 459 460 DumpWriter::~DumpWriter() { 461 // flush and close dump file 462 if (is_open()) { 463 close(); 464 } 465 if (_buffer != NULL) os::free(_buffer); 466 if (_error != NULL) os::free(_error); 467 } 468 469 // closes dump file (if open) 470 void DumpWriter::close() { 471 // flush and close dump file 472 if (is_open()) { 473 flush(); 474 ::close(file_descriptor()); 475 set_file_descriptor(-1); 476 } 477 } 478 479 // write directly to the file 480 void DumpWriter::write_internal(void* s, int len) { 481 if (is_open()) { 482 int n = ::write(file_descriptor(), s, len); 483 if (n > 0) { 484 _bytes_written += n; 485 } 486 if (n != len) { 487 if (n < 0) { 488 set_error(strerror(errno)); 489 } else { 490 set_error("file size limit"); 491 } 492 ::close(file_descriptor()); 493 set_file_descriptor(-1); 494 } 495 } 496 } 497 498 // write raw bytes 499 void DumpWriter::write_raw(void* s, int len) { 500 if (is_open()) { 501 // flush buffer to make toom 502 if ((position()+ len) >= buffer_size()) { 503 flush(); 504 } 505 506 // buffer not available or too big to buffer it 507 if ((buffer() == NULL) || (len >= buffer_size())) { 508 write_internal(s, len); 509 } else { 510 // Should optimize this for u1/u2/u4/u8 sizes. 511 memcpy(buffer() + position(), s, len); 512 set_position(position() + len); 513 } 514 } 515 } 516 517 // flush any buffered bytes to the file 518 void DumpWriter::flush() { 519 if (is_open() && position() > 0) { 520 write_internal(buffer(), position()); 521 set_position(0); 522 } 523 } 524 525 526 jlong DumpWriter::current_offset() { 527 if (is_open()) { 528 // the offset is the file offset plus whatever we have buffered 529 jlong offset = os::current_file_offset(file_descriptor()); 530 assert(offset >= 0, "lseek failed"); 531 return offset + (jlong)position(); 532 } else { 533 return (jlong)-1; 534 } 535 } 536 537 void DumpWriter::seek_to_offset(jlong off) { 538 assert(off >= 0, "bad offset"); 539 540 // need to flush before seeking 541 flush(); 542 543 // may be closed due to I/O error 544 if (is_open()) { 545 jlong n = os::seek_to_file_offset(file_descriptor(), off); 546 assert(n >= 0, "lseek failed"); 547 } 548 } 549 550 void DumpWriter::write_u2(u2 x) { 551 u2 v; 552 Bytes::put_Java_u2((address)&v, x); 553 write_raw((void*)&v, 2); 554 } 555 556 void DumpWriter::write_u4(u4 x) { 557 u4 v; 558 Bytes::put_Java_u4((address)&v, x); 559 write_raw((void*)&v, 4); 560 } 561 562 void DumpWriter::write_u8(u8 x) { 563 u8 v; 564 Bytes::put_Java_u8((address)&v, x); 565 write_raw((void*)&v, 8); 566 } 567 568 void DumpWriter::write_objectID(oop o) { 569 address a = (address)o; 570 #ifdef _LP64 571 write_u8((u8)a); 572 #else 573 write_u4((u4)a); 574 #endif 575 } 576 577 void DumpWriter::write_symbolID(Symbol* s) { 578 address a = (address)((uintptr_t)s); 579 #ifdef _LP64 580 write_u8((u8)a); 581 #else 582 write_u4((u4)a); 583 #endif 584 } 585 586 void DumpWriter::write_id(u4 x) { 587 #ifdef _LP64 588 write_u8((u8) x); 589 #else 590 write_u4(x); 591 #endif 592 } 593 594 // We use java mirror as the class ID 595 void DumpWriter::write_classID(Klass* k) { 596 write_objectID(k->java_mirror()); 597 } 598 599 600 601 // Support class with a collection of functions used when dumping the heap 602 603 class DumperSupport : AllStatic { 604 public: 605 606 // write a header of the given type 607 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 608 609 // returns hprof tag for the given type signature 610 static hprofTag sig2tag(Symbol* sig); 611 // returns hprof tag for the given basic type 612 static hprofTag type2tag(BasicType type); 613 614 // returns the size of the instance of the given class 615 static u4 instance_size(Klass* k); 616 617 // dump a jfloat 618 static void dump_float(DumpWriter* writer, jfloat f); 619 // dump a jdouble 620 static void dump_double(DumpWriter* writer, jdouble d); 621 // dumps the raw value of the given field 622 static void dump_field_value(DumpWriter* writer, char type, address addr); 623 // dumps static fields of the given class 624 static void dump_static_fields(DumpWriter* writer, Klass* k); 625 // dump the raw values of the instance fields of the given object 626 static void dump_instance_fields(DumpWriter* writer, oop o); 627 // dumps the definition of the instance fields for a given class 628 static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k); 629 // creates HPROF_GC_INSTANCE_DUMP record for the given object 630 static void dump_instance(DumpWriter* writer, oop o); 631 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 632 // array classes 633 static void dump_class_and_array_classes(DumpWriter* writer, Klass* k); 634 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 635 // class (and each multi-dimensional array class too) 636 static void dump_basic_type_array_class(DumpWriter* writer, Klass* k); 637 638 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 639 static void dump_object_array(DumpWriter* writer, objArrayOop array); 640 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 641 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 642 // create HPROF_FRAME record for the given method and bci 643 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci); 644 }; 645 646 // write a header of the given type 647 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 648 writer->write_u1((u1)tag); 649 writer->write_u4(0); // current ticks 650 writer->write_u4(len); 651 } 652 653 // returns hprof tag for the given type signature 654 hprofTag DumperSupport::sig2tag(Symbol* sig) { 655 switch (sig->byte_at(0)) { 656 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 657 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 658 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 659 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 660 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 661 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 662 case JVM_SIGNATURE_INT : return HPROF_INT; 663 case JVM_SIGNATURE_LONG : return HPROF_LONG; 664 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 665 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 666 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 667 } 668 } 669 670 hprofTag DumperSupport::type2tag(BasicType type) { 671 switch (type) { 672 case T_BYTE : return HPROF_BYTE; 673 case T_CHAR : return HPROF_CHAR; 674 case T_FLOAT : return HPROF_FLOAT; 675 case T_DOUBLE : return HPROF_DOUBLE; 676 case T_INT : return HPROF_INT; 677 case T_LONG : return HPROF_LONG; 678 case T_SHORT : return HPROF_SHORT; 679 case T_BOOLEAN : return HPROF_BOOLEAN; 680 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 681 } 682 } 683 684 // dump a jfloat 685 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 686 if (g_isnan(f)) { 687 writer->write_u4(0x7fc00000); // collapsing NaNs 688 } else { 689 union { 690 int i; 691 float f; 692 } u; 693 u.f = (float)f; 694 writer->write_u4((u4)u.i); 695 } 696 } 697 698 // dump a jdouble 699 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 700 union { 701 jlong l; 702 double d; 703 } u; 704 if (g_isnan(d)) { // collapsing NaNs 705 u.l = (jlong)(0x7ff80000); 706 u.l = (u.l << 32); 707 } else { 708 u.d = (double)d; 709 } 710 writer->write_u8((u8)u.l); 711 } 712 713 // dumps the raw value of the given field 714 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 715 switch (type) { 716 case JVM_SIGNATURE_CLASS : 717 case JVM_SIGNATURE_ARRAY : { 718 oop o; 719 if (UseCompressedOops) { 720 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 721 } else { 722 o = oopDesc::load_decode_heap_oop((oop*)addr); 723 } 724 725 // reflection and sun.misc.Unsafe classes may have a reference to a 726 // Klass* so filter it out. 727 assert(o->is_oop_or_null(), err_msg("Expected an oop or NULL at " PTR_FORMAT, p2i(o))); 728 writer->write_objectID(o); 729 break; 730 } 731 case JVM_SIGNATURE_BYTE : { 732 jbyte* b = (jbyte*)addr; 733 writer->write_u1((u1)*b); 734 break; 735 } 736 case JVM_SIGNATURE_CHAR : { 737 jchar* c = (jchar*)addr; 738 writer->write_u2((u2)*c); 739 break; 740 } 741 case JVM_SIGNATURE_SHORT : { 742 jshort* s = (jshort*)addr; 743 writer->write_u2((u2)*s); 744 break; 745 } 746 case JVM_SIGNATURE_FLOAT : { 747 jfloat* f = (jfloat*)addr; 748 dump_float(writer, *f); 749 break; 750 } 751 case JVM_SIGNATURE_DOUBLE : { 752 jdouble* f = (jdouble*)addr; 753 dump_double(writer, *f); 754 break; 755 } 756 case JVM_SIGNATURE_INT : { 757 jint* i = (jint*)addr; 758 writer->write_u4((u4)*i); 759 break; 760 } 761 case JVM_SIGNATURE_LONG : { 762 jlong* l = (jlong*)addr; 763 writer->write_u8((u8)*l); 764 break; 765 } 766 case JVM_SIGNATURE_BOOLEAN : { 767 jboolean* b = (jboolean*)addr; 768 writer->write_u1((u1)*b); 769 break; 770 } 771 default : ShouldNotReachHere(); 772 } 773 } 774 775 // returns the size of the instance of the given class 776 u4 DumperSupport::instance_size(Klass* k) { 777 HandleMark hm; 778 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 779 780 int size = 0; 781 782 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 783 if (!fld.access_flags().is_static()) { 784 Symbol* sig = fld.signature(); 785 switch (sig->byte_at(0)) { 786 case JVM_SIGNATURE_CLASS : 787 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 788 789 case JVM_SIGNATURE_BYTE : 790 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 791 792 case JVM_SIGNATURE_CHAR : 793 case JVM_SIGNATURE_SHORT : size += 2; break; 794 795 case JVM_SIGNATURE_INT : 796 case JVM_SIGNATURE_FLOAT : size += 4; break; 797 798 case JVM_SIGNATURE_LONG : 799 case JVM_SIGNATURE_DOUBLE : size += 8; break; 800 801 default : ShouldNotReachHere(); 802 } 803 } 804 } 805 return (u4)size; 806 } 807 808 // dumps static fields of the given class 809 void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) { 810 HandleMark hm; 811 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 812 813 // pass 1 - count the static fields 814 u2 field_count = 0; 815 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 816 if (fldc.access_flags().is_static()) field_count++; 817 } 818 819 writer->write_u2(field_count); 820 821 // pass 2 - dump the field descriptors and raw values 822 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 823 if (fld.access_flags().is_static()) { 824 Symbol* sig = fld.signature(); 825 826 writer->write_symbolID(fld.name()); // name 827 writer->write_u1(sig2tag(sig)); // type 828 829 // value 830 int offset = fld.offset(); 831 address addr = (address)ikh->java_mirror() + offset; 832 833 dump_field_value(writer, sig->byte_at(0), addr); 834 } 835 } 836 } 837 838 // dump the raw values of the instance fields of the given object 839 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 840 HandleMark hm; 841 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 842 843 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 844 if (!fld.access_flags().is_static()) { 845 Symbol* sig = fld.signature(); 846 address addr = (address)o + fld.offset(); 847 848 dump_field_value(writer, sig->byte_at(0), addr); 849 } 850 } 851 } 852 853 // dumps the definition of the instance fields for a given class 854 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) { 855 HandleMark hm; 856 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 857 858 // pass 1 - count the instance fields 859 u2 field_count = 0; 860 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 861 if (!fldc.access_flags().is_static()) field_count++; 862 } 863 864 writer->write_u2(field_count); 865 866 // pass 2 - dump the field descriptors 867 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 868 if (!fld.access_flags().is_static()) { 869 Symbol* sig = fld.signature(); 870 871 writer->write_symbolID(fld.name()); // name 872 writer->write_u1(sig2tag(sig)); // type 873 } 874 } 875 } 876 877 // creates HPROF_GC_INSTANCE_DUMP record for the given object 878 void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 879 Klass* k = o->klass(); 880 881 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 882 writer->write_objectID(o); 883 writer->write_u4(STACK_TRACE_ID); 884 885 // class ID 886 writer->write_classID(k); 887 888 // number of bytes that follow 889 writer->write_u4(instance_size(k) ); 890 891 // field values 892 dump_instance_fields(writer, o); 893 } 894 895 // creates HPROF_GC_CLASS_DUMP record for the given class and each of 896 // its array classes 897 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) { 898 Klass* klass = k; 899 assert(klass->oop_is_instance(), "not an InstanceKlass"); 900 InstanceKlass* ik = (InstanceKlass*)klass; 901 902 writer->write_u1(HPROF_GC_CLASS_DUMP); 903 904 // class ID 905 writer->write_classID(ik); 906 writer->write_u4(STACK_TRACE_ID); 907 908 // super class ID 909 Klass* java_super = ik->java_super(); 910 if (java_super == NULL) { 911 writer->write_objectID(oop(NULL)); 912 } else { 913 writer->write_classID(java_super); 914 } 915 916 writer->write_objectID(ik->class_loader()); 917 writer->write_objectID(ik->signers()); 918 writer->write_objectID(ik->protection_domain()); 919 920 // reserved 921 writer->write_objectID(oop(NULL)); 922 writer->write_objectID(oop(NULL)); 923 924 // instance size 925 writer->write_u4(DumperSupport::instance_size(k)); 926 927 // size of constant pool - ignored by HAT 1.1 928 writer->write_u2(0); 929 930 // number of static fields 931 dump_static_fields(writer, k); 932 933 // description of instance fields 934 dump_instance_field_descriptors(writer, k); 935 936 // array classes 937 k = klass->array_klass_or_null(); 938 while (k != NULL) { 939 Klass* klass = k; 940 assert(klass->oop_is_objArray(), "not an ObjArrayKlass"); 941 942 writer->write_u1(HPROF_GC_CLASS_DUMP); 943 writer->write_classID(klass); 944 writer->write_u4(STACK_TRACE_ID); 945 946 // super class of array classes is java.lang.Object 947 java_super = klass->java_super(); 948 assert(java_super != NULL, "checking"); 949 writer->write_classID(java_super); 950 951 writer->write_objectID(ik->class_loader()); 952 writer->write_objectID(ik->signers()); 953 writer->write_objectID(ik->protection_domain()); 954 955 writer->write_objectID(oop(NULL)); // reserved 956 writer->write_objectID(oop(NULL)); 957 writer->write_u4(0); // instance size 958 writer->write_u2(0); // constant pool 959 writer->write_u2(0); // static fields 960 writer->write_u2(0); // instance fields 961 962 // get the array class for the next rank 963 k = klass->array_klass_or_null(); 964 } 965 } 966 967 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 968 // class (and each multi-dimensional array class too) 969 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) { 970 // array classes 971 while (k != NULL) { 972 Klass* klass = k; 973 974 writer->write_u1(HPROF_GC_CLASS_DUMP); 975 writer->write_classID(klass); 976 writer->write_u4(STACK_TRACE_ID); 977 978 // super class of array classes is java.lang.Object 979 Klass* java_super = klass->java_super(); 980 assert(java_super != NULL, "checking"); 981 writer->write_classID(java_super); 982 983 writer->write_objectID(oop(NULL)); // loader 984 writer->write_objectID(oop(NULL)); // signers 985 writer->write_objectID(oop(NULL)); // protection domain 986 987 writer->write_objectID(oop(NULL)); // reserved 988 writer->write_objectID(oop(NULL)); 989 writer->write_u4(0); // instance size 990 writer->write_u2(0); // constant pool 991 writer->write_u2(0); // static fields 992 writer->write_u2(0); // instance fields 993 994 // get the array class for the next rank 995 k = klass->array_klass_or_null(); 996 } 997 } 998 999 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 1000 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 1001 1002 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 1003 writer->write_objectID(array); 1004 writer->write_u4(STACK_TRACE_ID); 1005 writer->write_u4((u4)array->length()); 1006 1007 // array class ID 1008 writer->write_classID(array->klass()); 1009 1010 // [id]* elements 1011 for (int index=0; index<array->length(); index++) { 1012 oop o = array->obj_at(index); 1013 writer->write_objectID(o); 1014 } 1015 } 1016 1017 #define WRITE_ARRAY(Array, Type, Size) \ 1018 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); } 1019 1020 1021 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1022 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1023 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); 1024 1025 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1026 writer->write_objectID(array); 1027 writer->write_u4(STACK_TRACE_ID); 1028 writer->write_u4((u4)array->length()); 1029 writer->write_u1(type2tag(type)); 1030 1031 // nothing to copy 1032 if (array->length() == 0) { 1033 return; 1034 } 1035 1036 // If the byte ordering is big endian then we can copy most types directly 1037 int length_in_bytes = array->length() * type2aelembytes(type); 1038 assert(length_in_bytes > 0, "nothing to copy"); 1039 1040 switch (type) { 1041 case T_INT : { 1042 if (Bytes::is_Java_byte_ordering_different()) { 1043 WRITE_ARRAY(array, int, u4); 1044 } else { 1045 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1046 } 1047 break; 1048 } 1049 case T_BYTE : { 1050 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1051 break; 1052 } 1053 case T_CHAR : { 1054 if (Bytes::is_Java_byte_ordering_different()) { 1055 WRITE_ARRAY(array, char, u2); 1056 } else { 1057 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1058 } 1059 break; 1060 } 1061 case T_SHORT : { 1062 if (Bytes::is_Java_byte_ordering_different()) { 1063 WRITE_ARRAY(array, short, u2); 1064 } else { 1065 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1066 } 1067 break; 1068 } 1069 case T_BOOLEAN : { 1070 if (Bytes::is_Java_byte_ordering_different()) { 1071 WRITE_ARRAY(array, bool, u1); 1072 } else { 1073 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1074 } 1075 break; 1076 } 1077 case T_LONG : { 1078 if (Bytes::is_Java_byte_ordering_different()) { 1079 WRITE_ARRAY(array, long, u8); 1080 } else { 1081 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1082 } 1083 break; 1084 } 1085 1086 // handle float/doubles in a special value to ensure than NaNs are 1087 // written correctly. TO DO: Check if we can avoid this on processors that 1088 // use IEEE 754. 1089 1090 case T_FLOAT : { 1091 for (int i=0; i<array->length(); i++) { 1092 dump_float( writer, array->float_at(i) ); 1093 } 1094 break; 1095 } 1096 case T_DOUBLE : { 1097 for (int i=0; i<array->length(); i++) { 1098 dump_double( writer, array->double_at(i) ); 1099 } 1100 break; 1101 } 1102 default : ShouldNotReachHere(); 1103 } 1104 } 1105 1106 // create a HPROF_FRAME record of the given Method* and bci 1107 void DumperSupport::dump_stack_frame(DumpWriter* writer, 1108 int frame_serial_num, 1109 int class_serial_num, 1110 Method* m, 1111 int bci) { 1112 int line_number; 1113 if (m->is_native()) { 1114 line_number = -3; // native frame 1115 } else { 1116 line_number = m->line_number_from_bci(bci); 1117 } 1118 1119 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1120 writer->write_id(frame_serial_num); // frame serial number 1121 writer->write_symbolID(m->name()); // method's name 1122 writer->write_symbolID(m->signature()); // method's signature 1123 1124 assert(m->method_holder()->oop_is_instance(), "not InstanceKlass"); 1125 writer->write_symbolID(m->method_holder()->source_file_name()); // source file name 1126 writer->write_u4(class_serial_num); // class serial number 1127 writer->write_u4((u4) line_number); // line number 1128 } 1129 1130 1131 // Support class used to generate HPROF_UTF8 records from the entries in the 1132 // SymbolTable. 1133 1134 class SymbolTableDumper : public SymbolClosure { 1135 private: 1136 DumpWriter* _writer; 1137 DumpWriter* writer() const { return _writer; } 1138 public: 1139 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1140 void do_symbol(Symbol** p); 1141 }; 1142 1143 void SymbolTableDumper::do_symbol(Symbol** p) { 1144 ResourceMark rm; 1145 Symbol* sym = load_symbol(p); 1146 int len = sym->utf8_length(); 1147 if (len > 0) { 1148 char* s = sym->as_utf8(); 1149 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1150 writer()->write_symbolID(sym); 1151 writer()->write_raw(s, len); 1152 } 1153 } 1154 1155 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1156 1157 class JNILocalsDumper : public OopClosure { 1158 private: 1159 DumpWriter* _writer; 1160 u4 _thread_serial_num; 1161 int _frame_num; 1162 DumpWriter* writer() const { return _writer; } 1163 public: 1164 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1165 _writer = writer; 1166 _thread_serial_num = thread_serial_num; 1167 _frame_num = -1; // default - empty stack 1168 } 1169 void set_frame_number(int n) { _frame_num = n; } 1170 void do_oop(oop* obj_p); 1171 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1172 }; 1173 1174 1175 void JNILocalsDumper::do_oop(oop* obj_p) { 1176 // ignore null or deleted handles 1177 oop o = *obj_p; 1178 if (o != NULL && o != JNIHandles::deleted_handle()) { 1179 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1180 writer()->write_objectID(o); 1181 writer()->write_u4(_thread_serial_num); 1182 writer()->write_u4((u4)_frame_num); 1183 } 1184 } 1185 1186 1187 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1188 1189 class JNIGlobalsDumper : public OopClosure { 1190 private: 1191 DumpWriter* _writer; 1192 DumpWriter* writer() const { return _writer; } 1193 1194 public: 1195 JNIGlobalsDumper(DumpWriter* writer) { 1196 _writer = writer; 1197 } 1198 void do_oop(oop* obj_p); 1199 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1200 }; 1201 1202 void JNIGlobalsDumper::do_oop(oop* obj_p) { 1203 oop o = *obj_p; 1204 1205 // ignore these 1206 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1207 1208 // we ignore global ref to symbols and other internal objects 1209 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1210 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1211 writer()->write_objectID(o); 1212 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1213 } 1214 }; 1215 1216 1217 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1218 1219 class MonitorUsedDumper : public OopClosure { 1220 private: 1221 DumpWriter* _writer; 1222 DumpWriter* writer() const { return _writer; } 1223 public: 1224 MonitorUsedDumper(DumpWriter* writer) { 1225 _writer = writer; 1226 } 1227 void do_oop(oop* obj_p) { 1228 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1229 writer()->write_objectID(*obj_p); 1230 } 1231 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1232 }; 1233 1234 1235 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1236 1237 class StickyClassDumper : public KlassClosure { 1238 private: 1239 DumpWriter* _writer; 1240 DumpWriter* writer() const { return _writer; } 1241 public: 1242 StickyClassDumper(DumpWriter* writer) { 1243 _writer = writer; 1244 } 1245 void do_klass(Klass* k) { 1246 if (k->oop_is_instance()) { 1247 InstanceKlass* ik = InstanceKlass::cast(k); 1248 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1249 writer()->write_classID(ik); 1250 } 1251 } 1252 }; 1253 1254 1255 class VM_HeapDumper; 1256 1257 // Support class using when iterating over the heap. 1258 1259 class HeapObjectDumper : public ObjectClosure { 1260 private: 1261 VM_HeapDumper* _dumper; 1262 DumpWriter* _writer; 1263 1264 VM_HeapDumper* dumper() { return _dumper; } 1265 DumpWriter* writer() { return _writer; } 1266 1267 // used to indicate that a record has been writen 1268 void mark_end_of_record(); 1269 1270 public: 1271 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1272 _dumper = dumper; 1273 _writer = writer; 1274 } 1275 1276 // called for each object in the heap 1277 void do_object(oop o); 1278 }; 1279 1280 void HeapObjectDumper::do_object(oop o) { 1281 // hide the sentinel for deleted handles 1282 if (o == JNIHandles::deleted_handle()) return; 1283 1284 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1285 if (o->klass() == SystemDictionary::Class_klass()) { 1286 if (!java_lang_Class::is_primitive(o)) { 1287 return; 1288 } 1289 } 1290 1291 // create a HPROF_GC_INSTANCE record for each object 1292 if (o->is_instance()) { 1293 DumperSupport::dump_instance(writer(), o); 1294 mark_end_of_record(); 1295 } else { 1296 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1297 if (o->is_objArray()) { 1298 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1299 mark_end_of_record(); 1300 } else { 1301 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1302 if (o->is_typeArray()) { 1303 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1304 mark_end_of_record(); 1305 } 1306 } 1307 } 1308 } 1309 1310 // The VM operation that performs the heap dump 1311 class VM_HeapDumper : public VM_GC_Operation { 1312 private: 1313 static VM_HeapDumper* _global_dumper; 1314 static DumpWriter* _global_writer; 1315 DumpWriter* _local_writer; 1316 JavaThread* _oome_thread; 1317 Method* _oome_constructor; 1318 bool _gc_before_heap_dump; 1319 bool _is_segmented_dump; 1320 jlong _dump_start; 1321 GrowableArray<Klass*>* _klass_map; 1322 ThreadStackTrace** _stack_traces; 1323 int _num_threads; 1324 1325 // accessors and setters 1326 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1327 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1328 void set_global_dumper() { 1329 assert(_global_dumper == NULL, "Error"); 1330 _global_dumper = this; 1331 } 1332 void set_global_writer() { 1333 assert(_global_writer == NULL, "Error"); 1334 _global_writer = _local_writer; 1335 } 1336 void clear_global_dumper() { _global_dumper = NULL; } 1337 void clear_global_writer() { _global_writer = NULL; } 1338 1339 bool is_segmented_dump() const { return _is_segmented_dump; } 1340 void set_segmented_dump() { _is_segmented_dump = true; } 1341 jlong dump_start() const { return _dump_start; } 1342 void set_dump_start(jlong pos); 1343 1344 bool skip_operation() const; 1345 1346 // writes a HPROF_LOAD_CLASS record 1347 static void do_load_class(Klass* k); 1348 1349 // writes a HPROF_GC_CLASS_DUMP record for the given class 1350 // (and each array class too) 1351 static void do_class_dump(Klass* k); 1352 1353 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1354 // array (and each multi-dimensional array too) 1355 static void do_basic_type_array_class_dump(Klass* k); 1356 1357 // HPROF_GC_ROOT_THREAD_OBJ records 1358 int do_thread(JavaThread* thread, u4 thread_serial_num); 1359 void do_threads(); 1360 1361 void add_class_serial_number(Klass* k, int serial_num) { 1362 _klass_map->at_put_grow(serial_num, k); 1363 } 1364 1365 // HPROF_TRACE and HPROF_FRAME records 1366 void dump_stack_traces(); 1367 1368 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1369 void write_dump_header(); 1370 1371 // fixes up the length of the current dump record 1372 void write_current_dump_record_length(); 1373 1374 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1375 // record in the case of a segmented heap dump) 1376 void end_of_dump(); 1377 1378 public: 1379 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1380 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1381 GCCause::_heap_dump /* GC Cause */, 1382 0 /* total full collections, dummy, ignored */, 1383 gc_before_heap_dump) { 1384 _local_writer = writer; 1385 _gc_before_heap_dump = gc_before_heap_dump; 1386 _is_segmented_dump = false; 1387 _dump_start = (jlong)-1; 1388 _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1389 _stack_traces = NULL; 1390 _num_threads = 0; 1391 if (oome) { 1392 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1393 // get OutOfMemoryError zero-parameter constructor 1394 InstanceKlass* oome_ik = InstanceKlass::cast(SystemDictionary::OutOfMemoryError_klass()); 1395 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1396 vmSymbols::void_method_signature()); 1397 // get thread throwing OOME when generating the heap dump at OOME 1398 _oome_thread = JavaThread::current(); 1399 } else { 1400 _oome_thread = NULL; 1401 _oome_constructor = NULL; 1402 } 1403 } 1404 ~VM_HeapDumper() { 1405 if (_stack_traces != NULL) { 1406 for (int i=0; i < _num_threads; i++) { 1407 delete _stack_traces[i]; 1408 } 1409 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces); 1410 } 1411 delete _klass_map; 1412 } 1413 1414 VMOp_Type type() const { return VMOp_HeapDumper; } 1415 // used to mark sub-record boundary 1416 void check_segment_length(); 1417 void doit(); 1418 }; 1419 1420 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1421 DumpWriter* VM_HeapDumper::_global_writer = NULL; 1422 1423 bool VM_HeapDumper::skip_operation() const { 1424 return false; 1425 } 1426 1427 // sets the dump starting position 1428 void VM_HeapDumper::set_dump_start(jlong pos) { 1429 _dump_start = pos; 1430 } 1431 1432 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1433 void VM_HeapDumper::write_dump_header() { 1434 if (writer()->is_open()) { 1435 if (is_segmented_dump()) { 1436 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1437 } else { 1438 writer()->write_u1(HPROF_HEAP_DUMP); 1439 } 1440 writer()->write_u4(0); // current ticks 1441 1442 // record the starting position for the dump (its length will be fixed up later) 1443 set_dump_start(writer()->current_offset()); 1444 writer()->write_u4(0); 1445 } 1446 } 1447 1448 // fixes up the length of the current dump record 1449 void VM_HeapDumper::write_current_dump_record_length() { 1450 if (writer()->is_open()) { 1451 assert(dump_start() >= 0, "no dump start recorded"); 1452 1453 // calculate the size of the dump record 1454 jlong dump_end = writer()->current_offset(); 1455 jlong dump_len = (dump_end - dump_start() - 4); 1456 1457 // record length must fit in a u4 1458 if (dump_len > (jlong)(4L*(jlong)G)) { 1459 warning("record is too large"); 1460 } 1461 1462 // seek to the dump start and fix-up the length 1463 writer()->seek_to_offset(dump_start()); 1464 writer()->write_u4((u4)dump_len); 1465 1466 // adjust the total size written to keep the bytes written correct. 1467 writer()->adjust_bytes_written(-((long) sizeof(u4))); 1468 1469 // seek to dump end so we can continue 1470 writer()->seek_to_offset(dump_end); 1471 1472 // no current dump record 1473 set_dump_start((jlong)-1); 1474 } 1475 } 1476 1477 // used on a sub-record boundary to check if we need to start a 1478 // new segment. 1479 void VM_HeapDumper::check_segment_length() { 1480 if (writer()->is_open()) { 1481 if (is_segmented_dump()) { 1482 // don't use current_offset that would be too expensive on a per record basis 1483 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten(); 1484 assert(dump_end == writer()->current_offset(), "checking"); 1485 jlong dump_len = (dump_end - dump_start() - 4); 1486 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length"); 1487 1488 if (dump_len > (jlong)HeapDumpSegmentSize) { 1489 write_current_dump_record_length(); 1490 write_dump_header(); 1491 } 1492 } 1493 } 1494 } 1495 1496 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1497 // record in the case of a segmented heap dump) 1498 void VM_HeapDumper::end_of_dump() { 1499 if (writer()->is_open()) { 1500 write_current_dump_record_length(); 1501 1502 // for segmented dump we write the end record 1503 if (is_segmented_dump()) { 1504 writer()->write_u1(HPROF_HEAP_DUMP_END); 1505 writer()->write_u4(0); 1506 writer()->write_u4(0); 1507 } 1508 } 1509 } 1510 1511 // marks sub-record boundary 1512 void HeapObjectDumper::mark_end_of_record() { 1513 dumper()->check_segment_length(); 1514 } 1515 1516 // writes a HPROF_LOAD_CLASS record for the class (and each of its 1517 // array classes) 1518 void VM_HeapDumper::do_load_class(Klass* k) { 1519 static u4 class_serial_num = 0; 1520 1521 // len of HPROF_LOAD_CLASS record 1522 u4 remaining = 2*oopSize + 2*sizeof(u4); 1523 1524 // write a HPROF_LOAD_CLASS for the class and each array class 1525 do { 1526 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1527 1528 // class serial number is just a number 1529 writer()->write_u4(++class_serial_num); 1530 1531 // class ID 1532 Klass* klass = k; 1533 writer()->write_classID(klass); 1534 1535 // add the Klass* and class serial number pair 1536 dumper()->add_class_serial_number(klass, class_serial_num); 1537 1538 writer()->write_u4(STACK_TRACE_ID); 1539 1540 // class name ID 1541 Symbol* name = klass->name(); 1542 writer()->write_symbolID(name); 1543 1544 // write a LOAD_CLASS record for the array type (if it exists) 1545 k = klass->array_klass_or_null(); 1546 } while (k != NULL); 1547 } 1548 1549 // writes a HPROF_GC_CLASS_DUMP record for the given class 1550 void VM_HeapDumper::do_class_dump(Klass* k) { 1551 if (k->oop_is_instance()) { 1552 DumperSupport::dump_class_and_array_classes(writer(), k); 1553 } 1554 } 1555 1556 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1557 // array (and each multi-dimensional array too) 1558 void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) { 1559 DumperSupport::dump_basic_type_array_class(writer(), k); 1560 } 1561 1562 // Walk the stack of the given thread. 1563 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1564 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1565 // 1566 // It returns the number of Java frames in this thread stack 1567 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1568 JNILocalsDumper blk(writer(), thread_serial_num); 1569 1570 oop threadObj = java_thread->threadObj(); 1571 assert(threadObj != NULL, "sanity check"); 1572 1573 int stack_depth = 0; 1574 if (java_thread->has_last_Java_frame()) { 1575 1576 // vframes are resource allocated 1577 Thread* current_thread = Thread::current(); 1578 ResourceMark rm(current_thread); 1579 HandleMark hm(current_thread); 1580 1581 RegisterMap reg_map(java_thread); 1582 frame f = java_thread->last_frame(); 1583 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1584 frame* last_entry_frame = NULL; 1585 int extra_frames = 0; 1586 1587 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1588 extra_frames++; 1589 } 1590 while (vf != NULL) { 1591 blk.set_frame_number(stack_depth); 1592 if (vf->is_java_frame()) { 1593 1594 // java frame (interpreted, compiled, ...) 1595 javaVFrame *jvf = javaVFrame::cast(vf); 1596 if (!(jvf->method()->is_native())) { 1597 StackValueCollection* locals = jvf->locals(); 1598 for (int slot=0; slot<locals->size(); slot++) { 1599 if (locals->at(slot)->type() == T_OBJECT) { 1600 oop o = locals->obj_at(slot)(); 1601 1602 if (o != NULL) { 1603 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1604 writer()->write_objectID(o); 1605 writer()->write_u4(thread_serial_num); 1606 writer()->write_u4((u4) (stack_depth + extra_frames)); 1607 } 1608 } 1609 } 1610 StackValueCollection *exprs = jvf->expressions(); 1611 for(int index = 0; index < exprs->size(); index++) { 1612 if (exprs->at(index)->type() == T_OBJECT) { 1613 oop o = exprs->obj_at(index)(); 1614 if (o != NULL) { 1615 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1616 writer()->write_objectID(o); 1617 writer()->write_u4(thread_serial_num); 1618 writer()->write_u4((u4) (stack_depth + extra_frames)); 1619 } 1620 } 1621 } 1622 } else { 1623 // native frame 1624 if (stack_depth == 0) { 1625 // JNI locals for the top frame. 1626 java_thread->active_handles()->oops_do(&blk); 1627 } else { 1628 if (last_entry_frame != NULL) { 1629 // JNI locals for the entry frame 1630 assert(last_entry_frame->is_entry_frame(), "checking"); 1631 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1632 } 1633 } 1634 } 1635 // increment only for Java frames 1636 stack_depth++; 1637 last_entry_frame = NULL; 1638 1639 } else { 1640 // externalVFrame - if it's an entry frame then report any JNI locals 1641 // as roots when we find the corresponding native javaVFrame 1642 frame* fr = vf->frame_pointer(); 1643 assert(fr != NULL, "sanity check"); 1644 if (fr->is_entry_frame()) { 1645 last_entry_frame = fr; 1646 } 1647 } 1648 vf = vf->sender(); 1649 } 1650 } else { 1651 // no last java frame but there may be JNI locals 1652 java_thread->active_handles()->oops_do(&blk); 1653 } 1654 return stack_depth; 1655 } 1656 1657 1658 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1659 // the stack so that locals and JNI locals are dumped. 1660 void VM_HeapDumper::do_threads() { 1661 for (int i=0; i < _num_threads; i++) { 1662 JavaThread* thread = _stack_traces[i]->thread(); 1663 oop threadObj = thread->threadObj(); 1664 u4 thread_serial_num = i+1; 1665 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1666 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1667 writer()->write_objectID(threadObj); 1668 writer()->write_u4(thread_serial_num); // thread number 1669 writer()->write_u4(stack_serial_num); // stack trace serial number 1670 int num_frames = do_thread(thread, thread_serial_num); 1671 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1672 "total number of Java frames not matched"); 1673 } 1674 } 1675 1676 1677 // The VM operation that dumps the heap. The dump consists of the following 1678 // records: 1679 // 1680 // HPROF_HEADER 1681 // [HPROF_UTF8]* 1682 // [HPROF_LOAD_CLASS]* 1683 // [[HPROF_FRAME]*|HPROF_TRACE]* 1684 // [HPROF_GC_CLASS_DUMP]* 1685 // HPROF_HEAP_DUMP 1686 // 1687 // The HPROF_TRACE records represent the stack traces where the heap dump 1688 // is generated and a "dummy trace" record which does not include 1689 // any frames. The dummy trace record is used to be referenced as the 1690 // unknown object alloc site. 1691 // 1692 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow 1693 // the heap dump be generated in a single pass we remember the position of 1694 // the dump length and fix it up after all sub-records have been written. 1695 // To generate the sub-records we iterate over the heap, writing 1696 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1697 // records as we go. Once that is done we write records for some of the GC 1698 // roots. 1699 1700 void VM_HeapDumper::doit() { 1701 1702 HandleMark hm; 1703 CollectedHeap* ch = Universe::heap(); 1704 1705 ch->ensure_parsability(false); // must happen, even if collection does 1706 // not happen (e.g. due to GC_locker) 1707 1708 if (_gc_before_heap_dump) { 1709 if (GC_locker::is_active()) { 1710 warning("GC locker is held; pre-heapdump GC was skipped"); 1711 } else { 1712 ch->collect_as_vm_thread(GCCause::_heap_dump); 1713 } 1714 } 1715 1716 // At this point we should be the only dumper active, so 1717 // the following should be safe. 1718 set_global_dumper(); 1719 set_global_writer(); 1720 1721 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1 1722 size_t used = ch->used(); 1723 const char* header; 1724 if (used > SegmentedHeapDumpThreshold) { 1725 set_segmented_dump(); 1726 header = "JAVA PROFILE 1.0.2"; 1727 } else { 1728 header = "JAVA PROFILE 1.0.1"; 1729 } 1730 1731 // header is few bytes long - no chance to overflow int 1732 writer()->write_raw((void*)header, (int)strlen(header)); 1733 writer()->write_u1(0); // terminator 1734 writer()->write_u4(oopSize); 1735 writer()->write_u8(os::javaTimeMillis()); 1736 1737 // HPROF_UTF8 records 1738 SymbolTableDumper sym_dumper(writer()); 1739 SymbolTable::symbols_do(&sym_dumper); 1740 1741 // write HPROF_LOAD_CLASS records 1742 ClassLoaderDataGraph::classes_do(&do_load_class); 1743 Universe::basic_type_classes_do(&do_load_class); 1744 1745 // write HPROF_FRAME and HPROF_TRACE records 1746 // this must be called after _klass_map is built when iterating the classes above. 1747 dump_stack_traces(); 1748 1749 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT 1750 write_dump_header(); 1751 1752 // Writes HPROF_GC_CLASS_DUMP records 1753 ClassLoaderDataGraph::classes_do(&do_class_dump); 1754 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1755 check_segment_length(); 1756 1757 // writes HPROF_GC_INSTANCE_DUMP records. 1758 // After each sub-record is written check_segment_length will be invoked. When 1759 // generated a segmented heap dump this allows us to check if the current 1760 // segment exceeds a threshold and if so, then a new segment is started. 1761 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1762 // of the heap dump. 1763 HeapObjectDumper obj_dumper(this, writer()); 1764 Universe::heap()->safe_object_iterate(&obj_dumper); 1765 1766 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1767 do_threads(); 1768 check_segment_length(); 1769 1770 // HPROF_GC_ROOT_MONITOR_USED 1771 MonitorUsedDumper mon_dumper(writer()); 1772 ObjectSynchronizer::oops_do(&mon_dumper); 1773 check_segment_length(); 1774 1775 // HPROF_GC_ROOT_JNI_GLOBAL 1776 JNIGlobalsDumper jni_dumper(writer()); 1777 JNIHandles::oops_do(&jni_dumper); 1778 check_segment_length(); 1779 1780 // HPROF_GC_ROOT_STICKY_CLASS 1781 StickyClassDumper class_dumper(writer()); 1782 SystemDictionary::always_strong_classes_do(&class_dumper); 1783 1784 // fixes up the length of the dump record. In the case of a segmented 1785 // heap then the HPROF_HEAP_DUMP_END record is also written. 1786 end_of_dump(); 1787 1788 // Now we clear the global variables, so that a future dumper might run. 1789 clear_global_dumper(); 1790 clear_global_writer(); 1791 } 1792 1793 void VM_HeapDumper::dump_stack_traces() { 1794 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1795 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1796 writer()->write_u4((u4) STACK_TRACE_ID); 1797 writer()->write_u4(0); // thread number 1798 writer()->write_u4(0); // frame count 1799 1800 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal); 1801 int frame_serial_num = 0; 1802 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1803 oop threadObj = thread->threadObj(); 1804 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1805 // dump thread stack trace 1806 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1807 stack_trace->dump_stack_at_safepoint(-1); 1808 _stack_traces[_num_threads++] = stack_trace; 1809 1810 // write HPROF_FRAME records for this thread's stack trace 1811 int depth = stack_trace->get_stack_depth(); 1812 int thread_frame_start = frame_serial_num; 1813 int extra_frames = 0; 1814 // write fake frame that makes it look like the thread, which caused OOME, 1815 // is in the OutOfMemoryError zero-parameter constructor 1816 if (thread == _oome_thread && _oome_constructor != NULL) { 1817 int oome_serial_num = _klass_map->find(_oome_constructor->method_holder()); 1818 // the class serial number starts from 1 1819 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1820 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1821 _oome_constructor, 0); 1822 extra_frames++; 1823 } 1824 for (int j=0; j < depth; j++) { 1825 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1826 Method* m = frame->method(); 1827 int class_serial_num = _klass_map->find(m->method_holder()); 1828 // the class serial number starts from 1 1829 assert(class_serial_num > 0, "class not found"); 1830 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1831 } 1832 depth += extra_frames; 1833 1834 // write HPROF_TRACE record for one thread 1835 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1836 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1837 writer()->write_u4(stack_serial_num); // stack trace serial number 1838 writer()->write_u4((u4) _num_threads); // thread serial number 1839 writer()->write_u4(depth); // frame count 1840 for (int j=1; j <= depth; j++) { 1841 writer()->write_id(thread_frame_start + j); 1842 } 1843 } 1844 } 1845 } 1846 1847 // dump the heap to given path. 1848 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL 1849 int HeapDumper::dump(const char* path) { 1850 assert(path != NULL && strlen(path) > 0, "path missing"); 1851 1852 // print message in interactive case 1853 if (print_to_tty()) { 1854 tty->print_cr("Dumping heap to %s ...", path); 1855 timer()->start(); 1856 } 1857 1858 // create the dump writer. If the file can be opened then bail 1859 DumpWriter writer(path); 1860 if (!writer.is_open()) { 1861 set_error(writer.error()); 1862 if (print_to_tty()) { 1863 tty->print_cr("Unable to create %s: %s", path, 1864 (error() != NULL) ? error() : "reason unknown"); 1865 } 1866 return -1; 1867 } 1868 1869 // generate the dump 1870 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1871 if (Thread::current()->is_VM_thread()) { 1872 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1873 dumper.doit(); 1874 } else { 1875 VMThread::execute(&dumper); 1876 } 1877 1878 // close dump file and record any error that the writer may have encountered 1879 writer.close(); 1880 set_error(writer.error()); 1881 1882 // print message in interactive case 1883 if (print_to_tty()) { 1884 timer()->stop(); 1885 if (error() == NULL) { 1886 char msg[256]; 1887 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]", 1888 JLONG_FORMAT, timer()->seconds()); 1889 PRAGMA_DIAG_PUSH 1890 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL 1891 tty->print_cr(msg, writer.bytes_written()); 1892 PRAGMA_DIAG_POP 1893 } else { 1894 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1895 } 1896 } 1897 1898 return (writer.error() == NULL) ? 0 : -1; 1899 } 1900 1901 // stop timer (if still active), and free any error string we might be holding 1902 HeapDumper::~HeapDumper() { 1903 if (timer()->is_active()) { 1904 timer()->stop(); 1905 } 1906 set_error(NULL); 1907 } 1908 1909 1910 // returns the error string (resource allocated), or NULL 1911 char* HeapDumper::error_as_C_string() const { 1912 if (error() != NULL) { 1913 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1914 strcpy(str, error()); 1915 return str; 1916 } else { 1917 return NULL; 1918 } 1919 } 1920 1921 // set the error string 1922 void HeapDumper::set_error(char* error) { 1923 if (_error != NULL) { 1924 os::free(_error); 1925 } 1926 if (error == NULL) { 1927 _error = NULL; 1928 } else { 1929 _error = os::strdup(error); 1930 assert(_error != NULL, "allocation failure"); 1931 } 1932 } 1933 1934 // Called by out-of-memory error reporting by a single Java thread 1935 // outside of a JVM safepoint 1936 void HeapDumper::dump_heap_from_oome() { 1937 HeapDumper::dump_heap(true); 1938 } 1939 1940 // Called by error reporting by a single Java thread outside of a JVM safepoint, 1941 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1942 // callers are strictly serialized and guaranteed not to interfere below. For more 1943 // general use, however, this method will need modification to prevent 1944 // inteference when updating the static variables base_path and dump_file_seq below. 1945 void HeapDumper::dump_heap() { 1946 HeapDumper::dump_heap(false); 1947 } 1948 1949 void HeapDumper::dump_heap(bool oome) { 1950 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1951 static uint dump_file_seq = 0; 1952 char* my_path; 1953 const int max_digit_chars = 20; 1954 1955 const char* dump_file_name = "java_pid"; 1956 const char* dump_file_ext = ".hprof"; 1957 1958 // The dump file defaults to java_pid<pid>.hprof in the current working 1959 // directory. HeapDumpPath=<file> can be used to specify an alternative 1960 // dump file name or a directory where dump file is created. 1961 if (dump_file_seq == 0) { // first time in, we initialize base_path 1962 // Calculate potentially longest base path and check if we have enough 1963 // allocated statically. 1964 const size_t total_length = 1965 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + 1966 strlen(os::file_separator()) + max_digit_chars + 1967 strlen(dump_file_name) + strlen(dump_file_ext) + 1; 1968 if (total_length > sizeof(base_path)) { 1969 warning("Cannot create heap dump file. HeapDumpPath is too long."); 1970 return; 1971 } 1972 1973 bool use_default_filename = true; 1974 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 1975 // HeapDumpPath=<file> not specified 1976 } else { 1977 strncpy(base_path, HeapDumpPath, sizeof(base_path)); 1978 // check if the path is a directory (must exist) 1979 DIR* dir = os::opendir(base_path); 1980 if (dir == NULL) { 1981 use_default_filename = false; 1982 } else { 1983 // HeapDumpPath specified a directory. We append a file separator 1984 // (if needed). 1985 os::closedir(dir); 1986 size_t fs_len = strlen(os::file_separator()); 1987 if (strlen(base_path) >= fs_len) { 1988 char* end = base_path; 1989 end += (strlen(base_path) - fs_len); 1990 if (strcmp(end, os::file_separator()) != 0) { 1991 strcat(base_path, os::file_separator()); 1992 } 1993 } 1994 } 1995 } 1996 // If HeapDumpPath wasn't a file name then we append the default name 1997 if (use_default_filename) { 1998 const size_t dlen = strlen(base_path); // if heap dump dir specified 1999 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", 2000 dump_file_name, os::current_process_id(), dump_file_ext); 2001 } 2002 const size_t len = strlen(base_path) + 1; 2003 my_path = (char*)os::malloc(len, mtInternal); 2004 if (my_path == NULL) { 2005 warning("Cannot create heap dump file. Out of system memory."); 2006 return; 2007 } 2008 strncpy(my_path, base_path, len); 2009 } else { 2010 // Append a sequence number id for dumps following the first 2011 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 2012 my_path = (char*)os::malloc(len, mtInternal); 2013 if (my_path == NULL) { 2014 warning("Cannot create heap dump file. Out of system memory."); 2015 return; 2016 } 2017 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); 2018 } 2019 dump_file_seq++; // increment seq number for next time we dump 2020 2021 HeapDumper dumper(false /* no GC before heap dump */, 2022 true /* send to tty */, 2023 oome /* pass along out-of-memory-error flag */); 2024 dumper.dump(my_path); 2025 os::free(my_path); 2026 }