heapDumper.cpp revision 6412:53a41e7cbe05
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/reflectionUtils.hpp" 37#include "runtime/vframe.hpp" 38#include "runtime/vmThread.hpp" 39#include "runtime/vm_operations.hpp" 40#include "services/heapDumper.hpp" 41#include "services/threadService.hpp" 42#include "utilities/ostream.hpp" 43#include "utilities/macros.hpp" 44#if INCLUDE_ALL_GCS 45#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 46#endif // INCLUDE_ALL_GCS 47 48/* 49 * HPROF binary format - description copied from: 50 * src/share/demo/jvmti/hprof/hprof_io.c 51 * 52 * 53 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2" 54 * (0-terminated) 55 * 56 * u4 size of identifiers. Identifiers are used to represent 57 * UTF8 strings, objects, stack traces, etc. They usually 58 * have the same size as host pointers. For example, on 59 * Solaris and Win32, the size is 4. 60 * u4 high word 61 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 62 * [record]* a sequence of records. 63 * 64 * 65 * Record format: 66 * 67 * u1 a TAG denoting the type of the record 68 * u4 number of *microseconds* since the time stamp in the 69 * header. (wraps around in a little more than an hour) 70 * u4 number of bytes *remaining* in the record. Note that 71 * this number excludes the tag and the length field itself. 72 * [u1]* BODY of the record (a sequence of bytes) 73 * 74 * 75 * The following TAGs are supported: 76 * 77 * TAG BODY notes 78 *---------------------------------------------------------- 79 * HPROF_UTF8 a UTF8-encoded name 80 * 81 * id name ID 82 * [u1]* UTF8 characters (no trailing zero) 83 * 84 * HPROF_LOAD_CLASS a newly loaded class 85 * 86 * u4 class serial number (> 0) 87 * id class object ID 88 * u4 stack trace serial number 89 * id class name ID 90 * 91 * HPROF_UNLOAD_CLASS an unloading class 92 * 93 * u4 class serial_number 94 * 95 * HPROF_FRAME a Java stack frame 96 * 97 * id stack frame ID 98 * id method name ID 99 * id method signature ID 100 * id source file name ID 101 * u4 class serial number 102 * i4 line number. >0: normal 103 * -1: unknown 104 * -2: compiled method 105 * -3: native method 106 * 107 * HPROF_TRACE a Java stack trace 108 * 109 * u4 stack trace serial number 110 * u4 thread serial number 111 * u4 number of frames 112 * [id]* stack frame IDs 113 * 114 * 115 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC 116 * 117 * u2 flags 0x0001: incremental vs. complete 118 * 0x0002: sorted by allocation vs. live 119 * 0x0004: whether to force a GC 120 * u4 cutoff ratio 121 * u4 total live bytes 122 * u4 total live instances 123 * u8 total bytes allocated 124 * u8 total instances allocated 125 * u4 number of sites that follow 126 * [u1 is_array: 0: normal object 127 * 2: object array 128 * 4: boolean array 129 * 5: char array 130 * 6: float array 131 * 7: double array 132 * 8: byte array 133 * 9: short array 134 * 10: int array 135 * 11: long array 136 * u4 class serial number (may be zero during startup) 137 * u4 stack trace serial number 138 * u4 number of bytes alive 139 * u4 number of instances alive 140 * u4 number of bytes allocated 141 * u4]* number of instance allocated 142 * 143 * HPROF_START_THREAD a newly started thread. 144 * 145 * u4 thread serial number (> 0) 146 * id thread object ID 147 * u4 stack trace serial number 148 * id thread name ID 149 * id thread group name ID 150 * id thread group parent name ID 151 * 152 * HPROF_END_THREAD a terminating thread. 153 * 154 * u4 thread serial number 155 * 156 * HPROF_HEAP_SUMMARY heap summary 157 * 158 * u4 total live bytes 159 * u4 total live instances 160 * u8 total bytes allocated 161 * u8 total instances allocated 162 * 163 * HPROF_HEAP_DUMP denote a heap dump 164 * 165 * [heap dump sub-records]* 166 * 167 * There are four kinds of heap dump sub-records: 168 * 169 * u1 sub-record type 170 * 171 * HPROF_GC_ROOT_UNKNOWN unknown root 172 * 173 * id object ID 174 * 175 * HPROF_GC_ROOT_THREAD_OBJ thread object 176 * 177 * id thread object ID (may be 0 for a 178 * thread newly attached through JNI) 179 * u4 thread sequence number 180 * u4 stack trace sequence number 181 * 182 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root 183 * 184 * id object ID 185 * id JNI global ref ID 186 * 187 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref 188 * 189 * id object ID 190 * u4 thread serial number 191 * u4 frame # in stack trace (-1 for empty) 192 * 193 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame 194 * 195 * id object ID 196 * u4 thread serial number 197 * u4 frame # in stack trace (-1 for empty) 198 * 199 * HPROF_GC_ROOT_NATIVE_STACK Native stack 200 * 201 * id object ID 202 * u4 thread serial number 203 * 204 * HPROF_GC_ROOT_STICKY_CLASS System class 205 * 206 * id object ID 207 * 208 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block 209 * 210 * id object ID 211 * u4 thread serial number 212 * 213 * HPROF_GC_ROOT_MONITOR_USED Busy monitor 214 * 215 * id object ID 216 * 217 * HPROF_GC_CLASS_DUMP dump of a class object 218 * 219 * id class object ID 220 * u4 stack trace serial number 221 * id super class object ID 222 * id class loader object ID 223 * id signers object ID 224 * id protection domain object ID 225 * id reserved 226 * id reserved 227 * 228 * u4 instance size (in bytes) 229 * 230 * u2 size of constant pool 231 * [u2, constant pool index, 232 * ty, type 233 * 2: object 234 * 4: boolean 235 * 5: char 236 * 6: float 237 * 7: double 238 * 8: byte 239 * 9: short 240 * 10: int 241 * 11: long 242 * vl]* and value 243 * 244 * u2 number of static fields 245 * [id, static field name, 246 * ty, type, 247 * vl]* and value 248 * 249 * u2 number of inst. fields (not inc. super) 250 * [id, instance field name, 251 * ty]* type 252 * 253 * HPROF_GC_INSTANCE_DUMP dump of a normal object 254 * 255 * id object ID 256 * u4 stack trace serial number 257 * id class object ID 258 * u4 number of bytes that follow 259 * [vl]* instance field values (class, followed 260 * by super, super's super ...) 261 * 262 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array 263 * 264 * id array object ID 265 * u4 stack trace serial number 266 * u4 number of elements 267 * id array class ID 268 * [id]* elements 269 * 270 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array 271 * 272 * id array object ID 273 * u4 stack trace serial number 274 * u4 number of elements 275 * u1 element type 276 * 4: boolean array 277 * 5: char array 278 * 6: float array 279 * 7: double array 280 * 8: byte array 281 * 9: short array 282 * 10: int array 283 * 11: long array 284 * [u1]* elements 285 * 286 * HPROF_CPU_SAMPLES a set of sample traces of running threads 287 * 288 * u4 total number of samples 289 * u4 # of traces 290 * [u4 # of samples 291 * u4]* stack trace serial number 292 * 293 * HPROF_CONTROL_SETTINGS the settings of on/off switches 294 * 295 * u4 0x00000001: alloc traces on/off 296 * 0x00000002: cpu sampling on/off 297 * u2 stack trace depth 298 * 299 * 300 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally 301 * be generated as a sequence of heap dump segments. This sequence is 302 * terminated by an end record. The additional tags allowed by format 303 * "JAVA PROFILE 1.0.2" are: 304 * 305 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment 306 * 307 * [heap dump sub-records]* 308 * The same sub-record types allowed by HPROF_HEAP_DUMP 309 * 310 * HPROF_HEAP_DUMP_END denotes the end of a heap dump 311 * 312 */ 313 314 315// HPROF tags 316 317typedef enum { 318 // top-level records 319 HPROF_UTF8 = 0x01, 320 HPROF_LOAD_CLASS = 0x02, 321 HPROF_UNLOAD_CLASS = 0x03, 322 HPROF_FRAME = 0x04, 323 HPROF_TRACE = 0x05, 324 HPROF_ALLOC_SITES = 0x06, 325 HPROF_HEAP_SUMMARY = 0x07, 326 HPROF_START_THREAD = 0x0A, 327 HPROF_END_THREAD = 0x0B, 328 HPROF_HEAP_DUMP = 0x0C, 329 HPROF_CPU_SAMPLES = 0x0D, 330 HPROF_CONTROL_SETTINGS = 0x0E, 331 332 // 1.0.2 record types 333 HPROF_HEAP_DUMP_SEGMENT = 0x1C, 334 HPROF_HEAP_DUMP_END = 0x2C, 335 336 // field types 337 HPROF_ARRAY_OBJECT = 0x01, 338 HPROF_NORMAL_OBJECT = 0x02, 339 HPROF_BOOLEAN = 0x04, 340 HPROF_CHAR = 0x05, 341 HPROF_FLOAT = 0x06, 342 HPROF_DOUBLE = 0x07, 343 HPROF_BYTE = 0x08, 344 HPROF_SHORT = 0x09, 345 HPROF_INT = 0x0A, 346 HPROF_LONG = 0x0B, 347 348 // data-dump sub-records 349 HPROF_GC_ROOT_UNKNOWN = 0xFF, 350 HPROF_GC_ROOT_JNI_GLOBAL = 0x01, 351 HPROF_GC_ROOT_JNI_LOCAL = 0x02, 352 HPROF_GC_ROOT_JAVA_FRAME = 0x03, 353 HPROF_GC_ROOT_NATIVE_STACK = 0x04, 354 HPROF_GC_ROOT_STICKY_CLASS = 0x05, 355 HPROF_GC_ROOT_THREAD_BLOCK = 0x06, 356 HPROF_GC_ROOT_MONITOR_USED = 0x07, 357 HPROF_GC_ROOT_THREAD_OBJ = 0x08, 358 HPROF_GC_CLASS_DUMP = 0x20, 359 HPROF_GC_INSTANCE_DUMP = 0x21, 360 HPROF_GC_OBJ_ARRAY_DUMP = 0x22, 361 HPROF_GC_PRIM_ARRAY_DUMP = 0x23 362} hprofTag; 363 364// Default stack trace ID (used for dummy HPROF_TRACE record) 365enum { 366 STACK_TRACE_ID = 1, 367 INITIAL_CLASS_COUNT = 200 368}; 369 370// Supports I/O operations on a dump file 371 372class DumpWriter : public StackObj { 373 private: 374 enum { 375 io_buffer_size = 8*M 376 }; 377 378 int _fd; // file descriptor (-1 if dump file not open) 379 jlong _bytes_written; // number of byte written to dump file 380 381 char* _buffer; // internal buffer 382 int _size; 383 int _pos; 384 385 char* _error; // error message when I/O fails 386 387 void set_file_descriptor(int fd) { _fd = fd; } 388 int file_descriptor() const { return _fd; } 389 390 char* buffer() const { return _buffer; } 391 int buffer_size() const { return _size; } 392 int position() const { return _pos; } 393 void set_position(int pos) { _pos = pos; } 394 395 void set_error(const char* error) { _error = (char*)os::strdup(error); } 396 397 // all I/O go through this function 398 void write_internal(void* s, int len); 399 400 public: 401 DumpWriter(const char* path); 402 ~DumpWriter(); 403 404 void close(); 405 bool is_open() const { return file_descriptor() >= 0; } 406 void flush(); 407 408 // total number of bytes written to the disk 409 jlong bytes_written() const { return _bytes_written; } 410 411 // adjust the number of bytes written to disk (used to keep the count 412 // of the number of bytes written in case of rewrites) 413 void adjust_bytes_written(jlong n) { _bytes_written += n; } 414 415 // number of (buffered) bytes as yet unwritten to the dump file 416 jlong bytes_unwritten() const { return (jlong)position(); } 417 418 char* error() const { return _error; } 419 420 jlong current_offset(); 421 void seek_to_offset(jlong pos); 422 423 // writer functions 424 void write_raw(void* s, int len); 425 void write_u1(u1 x) { write_raw((void*)&x, 1); } 426 void write_u2(u2 x); 427 void write_u4(u4 x); 428 void write_u8(u8 x); 429 void write_objectID(oop o); 430 void write_symbolID(Symbol* o); 431 void write_classID(Klass* k); 432 void write_id(u4 x); 433}; 434 435DumpWriter::DumpWriter(const char* path) { 436 // try to allocate an I/O buffer of io_buffer_size. If there isn't 437 // sufficient memory then reduce size until we can allocate something. 438 _size = io_buffer_size; 439 do { 440 _buffer = (char*)os::malloc(_size, mtInternal); 441 if (_buffer == NULL) { 442 _size = _size >> 1; 443 } 444 } while (_buffer == NULL && _size > 0); 445 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 446 _pos = 0; 447 _error = NULL; 448 _bytes_written = 0L; 449 _fd = os::create_binary_file(path, false); // don't replace existing file 450 451 // if the open failed we record the error 452 if (_fd < 0) { 453 _error = (char*)os::strdup(strerror(errno)); 454 } 455} 456 457DumpWriter::~DumpWriter() { 458 // flush and close dump file 459 if (is_open()) { 460 close(); 461 } 462 if (_buffer != NULL) os::free(_buffer); 463 if (_error != NULL) os::free(_error); 464} 465 466// closes dump file (if open) 467void DumpWriter::close() { 468 // flush and close dump file 469 if (is_open()) { 470 flush(); 471 ::close(file_descriptor()); 472 set_file_descriptor(-1); 473 } 474} 475 476// write directly to the file 477void DumpWriter::write_internal(void* s, int len) { 478 if (is_open()) { 479 int n = ::write(file_descriptor(), s, len); 480 if (n > 0) { 481 _bytes_written += n; 482 } 483 if (n != len) { 484 if (n < 0) { 485 set_error(strerror(errno)); 486 } else { 487 set_error("file size limit"); 488 } 489 ::close(file_descriptor()); 490 set_file_descriptor(-1); 491 } 492 } 493} 494 495// write raw bytes 496void DumpWriter::write_raw(void* s, int len) { 497 if (is_open()) { 498 // flush buffer to make toom 499 if ((position()+ len) >= buffer_size()) { 500 flush(); 501 } 502 503 // buffer not available or too big to buffer it 504 if ((buffer() == NULL) || (len >= buffer_size())) { 505 write_internal(s, len); 506 } else { 507 // Should optimize this for u1/u2/u4/u8 sizes. 508 memcpy(buffer() + position(), s, len); 509 set_position(position() + len); 510 } 511 } 512} 513 514// flush any buffered bytes to the file 515void DumpWriter::flush() { 516 if (is_open() && position() > 0) { 517 write_internal(buffer(), position()); 518 set_position(0); 519 } 520} 521 522 523jlong DumpWriter::current_offset() { 524 if (is_open()) { 525 // the offset is the file offset plus whatever we have buffered 526 jlong offset = os::current_file_offset(file_descriptor()); 527 assert(offset >= 0, "lseek failed"); 528 return offset + (jlong)position(); 529 } else { 530 return (jlong)-1; 531 } 532} 533 534void DumpWriter::seek_to_offset(jlong off) { 535 assert(off >= 0, "bad offset"); 536 537 // need to flush before seeking 538 flush(); 539 540 // may be closed due to I/O error 541 if (is_open()) { 542 jlong n = os::seek_to_file_offset(file_descriptor(), off); 543 assert(n >= 0, "lseek failed"); 544 } 545} 546 547void DumpWriter::write_u2(u2 x) { 548 u2 v; 549 Bytes::put_Java_u2((address)&v, x); 550 write_raw((void*)&v, 2); 551} 552 553void DumpWriter::write_u4(u4 x) { 554 u4 v; 555 Bytes::put_Java_u4((address)&v, x); 556 write_raw((void*)&v, 4); 557} 558 559void DumpWriter::write_u8(u8 x) { 560 u8 v; 561 Bytes::put_Java_u8((address)&v, x); 562 write_raw((void*)&v, 8); 563} 564 565void DumpWriter::write_objectID(oop o) { 566 address a = (address)o; 567#ifdef _LP64 568 write_u8((u8)a); 569#else 570 write_u4((u4)a); 571#endif 572} 573 574void DumpWriter::write_symbolID(Symbol* s) { 575 address a = (address)((uintptr_t)s); 576#ifdef _LP64 577 write_u8((u8)a); 578#else 579 write_u4((u4)a); 580#endif 581} 582 583void DumpWriter::write_id(u4 x) { 584#ifdef _LP64 585 write_u8((u8) x); 586#else 587 write_u4(x); 588#endif 589} 590 591// We use java mirror as the class ID 592void DumpWriter::write_classID(Klass* k) { 593 write_objectID(k->java_mirror()); 594} 595 596 597 598// Support class with a collection of functions used when dumping the heap 599 600class DumperSupport : AllStatic { 601 public: 602 603 // write a header of the given type 604 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 605 606 // returns hprof tag for the given type signature 607 static hprofTag sig2tag(Symbol* sig); 608 // returns hprof tag for the given basic type 609 static hprofTag type2tag(BasicType type); 610 611 // returns the size of the instance of the given class 612 static u4 instance_size(Klass* k); 613 614 // dump a jfloat 615 static void dump_float(DumpWriter* writer, jfloat f); 616 // dump a jdouble 617 static void dump_double(DumpWriter* writer, jdouble d); 618 // dumps the raw value of the given field 619 static void dump_field_value(DumpWriter* writer, char type, address addr); 620 // dumps static fields of the given class 621 static void dump_static_fields(DumpWriter* writer, Klass* k); 622 // dump the raw values of the instance fields of the given object 623 static void dump_instance_fields(DumpWriter* writer, oop o); 624 // dumps the definition of the instance fields for a given class 625 static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k); 626 // creates HPROF_GC_INSTANCE_DUMP record for the given object 627 static void dump_instance(DumpWriter* writer, oop o); 628 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 629 // array classes 630 static void dump_class_and_array_classes(DumpWriter* writer, Klass* k); 631 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 632 // class (and each multi-dimensional array class too) 633 static void dump_basic_type_array_class(DumpWriter* writer, Klass* k); 634 635 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 636 static void dump_object_array(DumpWriter* writer, objArrayOop array); 637 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 638 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 639 // create HPROF_FRAME record for the given method and bci 640 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci); 641}; 642 643// write a header of the given type 644void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 645 writer->write_u1((u1)tag); 646 writer->write_u4(0); // current ticks 647 writer->write_u4(len); 648} 649 650// returns hprof tag for the given type signature 651hprofTag DumperSupport::sig2tag(Symbol* sig) { 652 switch (sig->byte_at(0)) { 653 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 654 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 655 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 656 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 657 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 658 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 659 case JVM_SIGNATURE_INT : return HPROF_INT; 660 case JVM_SIGNATURE_LONG : return HPROF_LONG; 661 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 662 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 663 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 664 } 665} 666 667hprofTag DumperSupport::type2tag(BasicType type) { 668 switch (type) { 669 case T_BYTE : return HPROF_BYTE; 670 case T_CHAR : return HPROF_CHAR; 671 case T_FLOAT : return HPROF_FLOAT; 672 case T_DOUBLE : return HPROF_DOUBLE; 673 case T_INT : return HPROF_INT; 674 case T_LONG : return HPROF_LONG; 675 case T_SHORT : return HPROF_SHORT; 676 case T_BOOLEAN : return HPROF_BOOLEAN; 677 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 678 } 679} 680 681// dump a jfloat 682void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 683 if (g_isnan(f)) { 684 writer->write_u4(0x7fc00000); // collapsing NaNs 685 } else { 686 union { 687 int i; 688 float f; 689 } u; 690 u.f = (float)f; 691 writer->write_u4((u4)u.i); 692 } 693} 694 695// dump a jdouble 696void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 697 union { 698 jlong l; 699 double d; 700 } u; 701 if (g_isnan(d)) { // collapsing NaNs 702 u.l = (jlong)(0x7ff80000); 703 u.l = (u.l << 32); 704 } else { 705 u.d = (double)d; 706 } 707 writer->write_u8((u8)u.l); 708} 709 710// dumps the raw value of the given field 711void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 712 switch (type) { 713 case JVM_SIGNATURE_CLASS : 714 case JVM_SIGNATURE_ARRAY : { 715 oop o; 716 if (UseCompressedOops) { 717 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 718 } else { 719 o = oopDesc::load_decode_heap_oop((oop*)addr); 720 } 721 722 // reflection and sun.misc.Unsafe classes may have a reference to a 723 // Klass* so filter it out. 724 assert(o->is_oop_or_null(), "should always be an oop"); 725 writer->write_objectID(o); 726 break; 727 } 728 case JVM_SIGNATURE_BYTE : { 729 jbyte* b = (jbyte*)addr; 730 writer->write_u1((u1)*b); 731 break; 732 } 733 case JVM_SIGNATURE_CHAR : { 734 jchar* c = (jchar*)addr; 735 writer->write_u2((u2)*c); 736 break; 737 } 738 case JVM_SIGNATURE_SHORT : { 739 jshort* s = (jshort*)addr; 740 writer->write_u2((u2)*s); 741 break; 742 } 743 case JVM_SIGNATURE_FLOAT : { 744 jfloat* f = (jfloat*)addr; 745 dump_float(writer, *f); 746 break; 747 } 748 case JVM_SIGNATURE_DOUBLE : { 749 jdouble* f = (jdouble*)addr; 750 dump_double(writer, *f); 751 break; 752 } 753 case JVM_SIGNATURE_INT : { 754 jint* i = (jint*)addr; 755 writer->write_u4((u4)*i); 756 break; 757 } 758 case JVM_SIGNATURE_LONG : { 759 jlong* l = (jlong*)addr; 760 writer->write_u8((u8)*l); 761 break; 762 } 763 case JVM_SIGNATURE_BOOLEAN : { 764 jboolean* b = (jboolean*)addr; 765 writer->write_u1((u1)*b); 766 break; 767 } 768 default : ShouldNotReachHere(); 769 } 770} 771 772// returns the size of the instance of the given class 773u4 DumperSupport::instance_size(Klass* k) { 774 HandleMark hm; 775 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 776 777 int size = 0; 778 779 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 780 if (!fld.access_flags().is_static()) { 781 Symbol* sig = fld.signature(); 782 switch (sig->byte_at(0)) { 783 case JVM_SIGNATURE_CLASS : 784 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 785 786 case JVM_SIGNATURE_BYTE : 787 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 788 789 case JVM_SIGNATURE_CHAR : 790 case JVM_SIGNATURE_SHORT : size += 2; break; 791 792 case JVM_SIGNATURE_INT : 793 case JVM_SIGNATURE_FLOAT : size += 4; break; 794 795 case JVM_SIGNATURE_LONG : 796 case JVM_SIGNATURE_DOUBLE : size += 8; break; 797 798 default : ShouldNotReachHere(); 799 } 800 } 801 } 802 return (u4)size; 803} 804 805// dumps static fields of the given class 806void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) { 807 HandleMark hm; 808 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 809 810 // pass 1 - count the static fields 811 u2 field_count = 0; 812 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 813 if (fldc.access_flags().is_static()) field_count++; 814 } 815 816 writer->write_u2(field_count); 817 818 // pass 2 - dump the field descriptors and raw values 819 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 820 if (fld.access_flags().is_static()) { 821 Symbol* sig = fld.signature(); 822 823 writer->write_symbolID(fld.name()); // name 824 writer->write_u1(sig2tag(sig)); // type 825 826 // value 827 int offset = fld.offset(); 828 address addr = (address)ikh->java_mirror() + offset; 829 830 dump_field_value(writer, sig->byte_at(0), addr); 831 } 832 } 833} 834 835// dump the raw values of the instance fields of the given object 836void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 837 HandleMark hm; 838 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 839 840 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 841 if (!fld.access_flags().is_static()) { 842 Symbol* sig = fld.signature(); 843 address addr = (address)o + fld.offset(); 844 845 dump_field_value(writer, sig->byte_at(0), addr); 846 } 847 } 848} 849 850// dumps the definition of the instance fields for a given class 851void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) { 852 HandleMark hm; 853 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 854 855 // pass 1 - count the instance fields 856 u2 field_count = 0; 857 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 858 if (!fldc.access_flags().is_static()) field_count++; 859 } 860 861 writer->write_u2(field_count); 862 863 // pass 2 - dump the field descriptors 864 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 865 if (!fld.access_flags().is_static()) { 866 Symbol* sig = fld.signature(); 867 868 writer->write_symbolID(fld.name()); // name 869 writer->write_u1(sig2tag(sig)); // type 870 } 871 } 872} 873 874// creates HPROF_GC_INSTANCE_DUMP record for the given object 875void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 876 Klass* k = o->klass(); 877 878 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 879 writer->write_objectID(o); 880 writer->write_u4(STACK_TRACE_ID); 881 882 // class ID 883 writer->write_classID(k); 884 885 // number of bytes that follow 886 writer->write_u4(instance_size(k) ); 887 888 // field values 889 dump_instance_fields(writer, o); 890} 891 892// creates HPROF_GC_CLASS_DUMP record for the given class and each of 893// its array classes 894void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) { 895 Klass* klass = k; 896 assert(klass->oop_is_instance(), "not an InstanceKlass"); 897 InstanceKlass* ik = (InstanceKlass*)klass; 898 899 writer->write_u1(HPROF_GC_CLASS_DUMP); 900 901 // class ID 902 writer->write_classID(ik); 903 writer->write_u4(STACK_TRACE_ID); 904 905 // super class ID 906 Klass* java_super = ik->java_super(); 907 if (java_super == NULL) { 908 writer->write_objectID(oop(NULL)); 909 } else { 910 writer->write_classID(java_super); 911 } 912 913 writer->write_objectID(ik->class_loader()); 914 writer->write_objectID(ik->signers()); 915 writer->write_objectID(ik->protection_domain()); 916 917 // reserved 918 writer->write_objectID(oop(NULL)); 919 writer->write_objectID(oop(NULL)); 920 921 // instance size 922 writer->write_u4(DumperSupport::instance_size(k)); 923 924 // size of constant pool - ignored by HAT 1.1 925 writer->write_u2(0); 926 927 // number of static fields 928 dump_static_fields(writer, k); 929 930 // description of instance fields 931 dump_instance_field_descriptors(writer, k); 932 933 // array classes 934 k = klass->array_klass_or_null(); 935 while (k != NULL) { 936 Klass* klass = k; 937 assert(klass->oop_is_objArray(), "not an ObjArrayKlass"); 938 939 writer->write_u1(HPROF_GC_CLASS_DUMP); 940 writer->write_classID(klass); 941 writer->write_u4(STACK_TRACE_ID); 942 943 // super class of array classes is java.lang.Object 944 java_super = klass->java_super(); 945 assert(java_super != NULL, "checking"); 946 writer->write_classID(java_super); 947 948 writer->write_objectID(ik->class_loader()); 949 writer->write_objectID(ik->signers()); 950 writer->write_objectID(ik->protection_domain()); 951 952 writer->write_objectID(oop(NULL)); // reserved 953 writer->write_objectID(oop(NULL)); 954 writer->write_u4(0); // instance size 955 writer->write_u2(0); // constant pool 956 writer->write_u2(0); // static fields 957 writer->write_u2(0); // instance fields 958 959 // get the array class for the next rank 960 k = klass->array_klass_or_null(); 961 } 962} 963 964// creates HPROF_GC_CLASS_DUMP record for a given primitive array 965// class (and each multi-dimensional array class too) 966void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) { 967 // array classes 968 while (k != NULL) { 969 Klass* klass = k; 970 971 writer->write_u1(HPROF_GC_CLASS_DUMP); 972 writer->write_classID(klass); 973 writer->write_u4(STACK_TRACE_ID); 974 975 // super class of array classes is java.lang.Object 976 Klass* java_super = klass->java_super(); 977 assert(java_super != NULL, "checking"); 978 writer->write_classID(java_super); 979 980 writer->write_objectID(oop(NULL)); // loader 981 writer->write_objectID(oop(NULL)); // signers 982 writer->write_objectID(oop(NULL)); // protection domain 983 984 writer->write_objectID(oop(NULL)); // reserved 985 writer->write_objectID(oop(NULL)); 986 writer->write_u4(0); // instance size 987 writer->write_u2(0); // constant pool 988 writer->write_u2(0); // static fields 989 writer->write_u2(0); // instance fields 990 991 // get the array class for the next rank 992 k = klass->array_klass_or_null(); 993 } 994} 995 996// creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 997void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 998 999 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 1000 writer->write_objectID(array); 1001 writer->write_u4(STACK_TRACE_ID); 1002 writer->write_u4((u4)array->length()); 1003 1004 // array class ID 1005 writer->write_classID(array->klass()); 1006 1007 // [id]* elements 1008 for (int index=0; index<array->length(); index++) { 1009 oop o = array->obj_at(index); 1010 writer->write_objectID(o); 1011 } 1012} 1013 1014#define WRITE_ARRAY(Array, Type, Size) \ 1015 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); } 1016 1017 1018// creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1019void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1020 BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); 1021 1022 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1023 writer->write_objectID(array); 1024 writer->write_u4(STACK_TRACE_ID); 1025 writer->write_u4((u4)array->length()); 1026 writer->write_u1(type2tag(type)); 1027 1028 // nothing to copy 1029 if (array->length() == 0) { 1030 return; 1031 } 1032 1033 // If the byte ordering is big endian then we can copy most types directly 1034 int length_in_bytes = array->length() * type2aelembytes(type); 1035 assert(length_in_bytes > 0, "nothing to copy"); 1036 1037 switch (type) { 1038 case T_INT : { 1039 if (Bytes::is_Java_byte_ordering_different()) { 1040 WRITE_ARRAY(array, int, u4); 1041 } else { 1042 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1043 } 1044 break; 1045 } 1046 case T_BYTE : { 1047 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1048 break; 1049 } 1050 case T_CHAR : { 1051 if (Bytes::is_Java_byte_ordering_different()) { 1052 WRITE_ARRAY(array, char, u2); 1053 } else { 1054 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1055 } 1056 break; 1057 } 1058 case T_SHORT : { 1059 if (Bytes::is_Java_byte_ordering_different()) { 1060 WRITE_ARRAY(array, short, u2); 1061 } else { 1062 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1063 } 1064 break; 1065 } 1066 case T_BOOLEAN : { 1067 if (Bytes::is_Java_byte_ordering_different()) { 1068 WRITE_ARRAY(array, bool, u1); 1069 } else { 1070 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1071 } 1072 break; 1073 } 1074 case T_LONG : { 1075 if (Bytes::is_Java_byte_ordering_different()) { 1076 WRITE_ARRAY(array, long, u8); 1077 } else { 1078 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1079 } 1080 break; 1081 } 1082 1083 // handle float/doubles in a special value to ensure than NaNs are 1084 // written correctly. TO DO: Check if we can avoid this on processors that 1085 // use IEEE 754. 1086 1087 case T_FLOAT : { 1088 for (int i=0; i<array->length(); i++) { 1089 dump_float( writer, array->float_at(i) ); 1090 } 1091 break; 1092 } 1093 case T_DOUBLE : { 1094 for (int i=0; i<array->length(); i++) { 1095 dump_double( writer, array->double_at(i) ); 1096 } 1097 break; 1098 } 1099 default : ShouldNotReachHere(); 1100 } 1101} 1102 1103// create a HPROF_FRAME record of the given Method* and bci 1104void DumperSupport::dump_stack_frame(DumpWriter* writer, 1105 int frame_serial_num, 1106 int class_serial_num, 1107 Method* m, 1108 int bci) { 1109 int line_number; 1110 if (m->is_native()) { 1111 line_number = -3; // native frame 1112 } else { 1113 line_number = m->line_number_from_bci(bci); 1114 } 1115 1116 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1117 writer->write_id(frame_serial_num); // frame serial number 1118 writer->write_symbolID(m->name()); // method's name 1119 writer->write_symbolID(m->signature()); // method's signature 1120 1121 assert(m->method_holder()->oop_is_instance(), "not InstanceKlass"); 1122 writer->write_symbolID(m->method_holder()->source_file_name()); // source file name 1123 writer->write_u4(class_serial_num); // class serial number 1124 writer->write_u4((u4) line_number); // line number 1125} 1126 1127 1128// Support class used to generate HPROF_UTF8 records from the entries in the 1129// SymbolTable. 1130 1131class SymbolTableDumper : public SymbolClosure { 1132 private: 1133 DumpWriter* _writer; 1134 DumpWriter* writer() const { return _writer; } 1135 public: 1136 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1137 void do_symbol(Symbol** p); 1138}; 1139 1140void SymbolTableDumper::do_symbol(Symbol** p) { 1141 ResourceMark rm; 1142 Symbol* sym = load_symbol(p); 1143 int len = sym->utf8_length(); 1144 if (len > 0) { 1145 char* s = sym->as_utf8(); 1146 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1147 writer()->write_symbolID(sym); 1148 writer()->write_raw(s, len); 1149 } 1150} 1151 1152// Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1153 1154class JNILocalsDumper : public OopClosure { 1155 private: 1156 DumpWriter* _writer; 1157 u4 _thread_serial_num; 1158 int _frame_num; 1159 DumpWriter* writer() const { return _writer; } 1160 public: 1161 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1162 _writer = writer; 1163 _thread_serial_num = thread_serial_num; 1164 _frame_num = -1; // default - empty stack 1165 } 1166 void set_frame_number(int n) { _frame_num = n; } 1167 void do_oop(oop* obj_p); 1168 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1169}; 1170 1171 1172void JNILocalsDumper::do_oop(oop* obj_p) { 1173 // ignore null or deleted handles 1174 oop o = *obj_p; 1175 if (o != NULL && o != JNIHandles::deleted_handle()) { 1176 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1177 writer()->write_objectID(o); 1178 writer()->write_u4(_thread_serial_num); 1179 writer()->write_u4((u4)_frame_num); 1180 } 1181} 1182 1183 1184// Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1185 1186class JNIGlobalsDumper : public OopClosure { 1187 private: 1188 DumpWriter* _writer; 1189 DumpWriter* writer() const { return _writer; } 1190 1191 public: 1192 JNIGlobalsDumper(DumpWriter* writer) { 1193 _writer = writer; 1194 } 1195 void do_oop(oop* obj_p); 1196 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1197}; 1198 1199void JNIGlobalsDumper::do_oop(oop* obj_p) { 1200 oop o = *obj_p; 1201 1202 // ignore these 1203 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1204 1205 // we ignore global ref to symbols and other internal objects 1206 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1207 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1208 writer()->write_objectID(o); 1209 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1210 } 1211}; 1212 1213 1214// Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1215 1216class MonitorUsedDumper : public OopClosure { 1217 private: 1218 DumpWriter* _writer; 1219 DumpWriter* writer() const { return _writer; } 1220 public: 1221 MonitorUsedDumper(DumpWriter* writer) { 1222 _writer = writer; 1223 } 1224 void do_oop(oop* obj_p) { 1225 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1226 writer()->write_objectID(*obj_p); 1227 } 1228 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1229}; 1230 1231 1232// Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1233 1234class StickyClassDumper : public KlassClosure { 1235 private: 1236 DumpWriter* _writer; 1237 DumpWriter* writer() const { return _writer; } 1238 public: 1239 StickyClassDumper(DumpWriter* writer) { 1240 _writer = writer; 1241 } 1242 void do_klass(Klass* k) { 1243 if (k->oop_is_instance()) { 1244 InstanceKlass* ik = InstanceKlass::cast(k); 1245 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1246 writer()->write_classID(ik); 1247 } 1248 } 1249}; 1250 1251 1252class VM_HeapDumper; 1253 1254// Support class using when iterating over the heap. 1255 1256class HeapObjectDumper : public ObjectClosure { 1257 private: 1258 VM_HeapDumper* _dumper; 1259 DumpWriter* _writer; 1260 1261 VM_HeapDumper* dumper() { return _dumper; } 1262 DumpWriter* writer() { return _writer; } 1263 1264 // used to indicate that a record has been writen 1265 void mark_end_of_record(); 1266 1267 public: 1268 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1269 _dumper = dumper; 1270 _writer = writer; 1271 } 1272 1273 // called for each object in the heap 1274 void do_object(oop o); 1275}; 1276 1277void HeapObjectDumper::do_object(oop o) { 1278 // hide the sentinel for deleted handles 1279 if (o == JNIHandles::deleted_handle()) return; 1280 1281 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1282 if (o->klass() == SystemDictionary::Class_klass()) { 1283 if (!java_lang_Class::is_primitive(o)) { 1284 return; 1285 } 1286 } 1287 1288 // create a HPROF_GC_INSTANCE record for each object 1289 if (o->is_instance()) { 1290 DumperSupport::dump_instance(writer(), o); 1291 mark_end_of_record(); 1292 } else { 1293 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1294 if (o->is_objArray()) { 1295 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1296 mark_end_of_record(); 1297 } else { 1298 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1299 if (o->is_typeArray()) { 1300 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1301 mark_end_of_record(); 1302 } 1303 } 1304 } 1305} 1306 1307// The VM operation that performs the heap dump 1308class VM_HeapDumper : public VM_GC_Operation { 1309 private: 1310 static VM_HeapDumper* _global_dumper; 1311 static DumpWriter* _global_writer; 1312 DumpWriter* _local_writer; 1313 JavaThread* _oome_thread; 1314 Method* _oome_constructor; 1315 bool _gc_before_heap_dump; 1316 bool _is_segmented_dump; 1317 jlong _dump_start; 1318 GrowableArray<Klass*>* _klass_map; 1319 ThreadStackTrace** _stack_traces; 1320 int _num_threads; 1321 1322 // accessors and setters 1323 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1324 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1325 void set_global_dumper() { 1326 assert(_global_dumper == NULL, "Error"); 1327 _global_dumper = this; 1328 } 1329 void set_global_writer() { 1330 assert(_global_writer == NULL, "Error"); 1331 _global_writer = _local_writer; 1332 } 1333 void clear_global_dumper() { _global_dumper = NULL; } 1334 void clear_global_writer() { _global_writer = NULL; } 1335 1336 bool is_segmented_dump() const { return _is_segmented_dump; } 1337 void set_segmented_dump() { _is_segmented_dump = true; } 1338 jlong dump_start() const { return _dump_start; } 1339 void set_dump_start(jlong pos); 1340 1341 bool skip_operation() const; 1342 1343 // writes a HPROF_LOAD_CLASS record 1344 static void do_load_class(Klass* k); 1345 1346 // writes a HPROF_GC_CLASS_DUMP record for the given class 1347 // (and each array class too) 1348 static void do_class_dump(Klass* k); 1349 1350 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1351 // array (and each multi-dimensional array too) 1352 static void do_basic_type_array_class_dump(Klass* k); 1353 1354 // HPROF_GC_ROOT_THREAD_OBJ records 1355 int do_thread(JavaThread* thread, u4 thread_serial_num); 1356 void do_threads(); 1357 1358 void add_class_serial_number(Klass* k, int serial_num) { 1359 _klass_map->at_put_grow(serial_num, k); 1360 } 1361 1362 // HPROF_TRACE and HPROF_FRAME records 1363 void dump_stack_traces(); 1364 1365 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1366 void write_dump_header(); 1367 1368 // fixes up the length of the current dump record 1369 void write_current_dump_record_length(); 1370 1371 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1372 // record in the case of a segmented heap dump) 1373 void end_of_dump(); 1374 1375 public: 1376 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1377 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1378 GCCause::_heap_dump /* GC Cause */, 1379 0 /* total full collections, dummy, ignored */, 1380 gc_before_heap_dump) { 1381 _local_writer = writer; 1382 _gc_before_heap_dump = gc_before_heap_dump; 1383 _is_segmented_dump = false; 1384 _dump_start = (jlong)-1; 1385 _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1386 _stack_traces = NULL; 1387 _num_threads = 0; 1388 if (oome) { 1389 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1390 // get OutOfMemoryError zero-parameter constructor 1391 InstanceKlass* oome_ik = InstanceKlass::cast(SystemDictionary::OutOfMemoryError_klass()); 1392 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1393 vmSymbols::void_method_signature()); 1394 // get thread throwing OOME when generating the heap dump at OOME 1395 _oome_thread = JavaThread::current(); 1396 } else { 1397 _oome_thread = NULL; 1398 _oome_constructor = NULL; 1399 } 1400 } 1401 ~VM_HeapDumper() { 1402 if (_stack_traces != NULL) { 1403 for (int i=0; i < _num_threads; i++) { 1404 delete _stack_traces[i]; 1405 } 1406 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces, mtInternal); 1407 } 1408 delete _klass_map; 1409 } 1410 1411 VMOp_Type type() const { return VMOp_HeapDumper; } 1412 // used to mark sub-record boundary 1413 void check_segment_length(); 1414 void doit(); 1415}; 1416 1417VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1418DumpWriter* VM_HeapDumper::_global_writer = NULL; 1419 1420bool VM_HeapDumper::skip_operation() const { 1421 return false; 1422} 1423 1424// sets the dump starting position 1425void VM_HeapDumper::set_dump_start(jlong pos) { 1426 _dump_start = pos; 1427} 1428 1429 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1430void VM_HeapDumper::write_dump_header() { 1431 if (writer()->is_open()) { 1432 if (is_segmented_dump()) { 1433 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1434 } else { 1435 writer()->write_u1(HPROF_HEAP_DUMP); 1436 } 1437 writer()->write_u4(0); // current ticks 1438 1439 // record the starting position for the dump (its length will be fixed up later) 1440 set_dump_start(writer()->current_offset()); 1441 writer()->write_u4(0); 1442 } 1443} 1444 1445// fixes up the length of the current dump record 1446void VM_HeapDumper::write_current_dump_record_length() { 1447 if (writer()->is_open()) { 1448 assert(dump_start() >= 0, "no dump start recorded"); 1449 1450 // calculate the size of the dump record 1451 jlong dump_end = writer()->current_offset(); 1452 jlong dump_len = (dump_end - dump_start() - 4); 1453 1454 // record length must fit in a u4 1455 if (dump_len > (jlong)(4L*(jlong)G)) { 1456 warning("record is too large"); 1457 } 1458 1459 // seek to the dump start and fix-up the length 1460 writer()->seek_to_offset(dump_start()); 1461 writer()->write_u4((u4)dump_len); 1462 1463 // adjust the total size written to keep the bytes written correct. 1464 writer()->adjust_bytes_written(-((long) sizeof(u4))); 1465 1466 // seek to dump end so we can continue 1467 writer()->seek_to_offset(dump_end); 1468 1469 // no current dump record 1470 set_dump_start((jlong)-1); 1471 } 1472} 1473 1474// used on a sub-record boundary to check if we need to start a 1475// new segment. 1476void VM_HeapDumper::check_segment_length() { 1477 if (writer()->is_open()) { 1478 if (is_segmented_dump()) { 1479 // don't use current_offset that would be too expensive on a per record basis 1480 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten(); 1481 assert(dump_end == writer()->current_offset(), "checking"); 1482 jlong dump_len = (dump_end - dump_start() - 4); 1483 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length"); 1484 1485 if (dump_len > (jlong)HeapDumpSegmentSize) { 1486 write_current_dump_record_length(); 1487 write_dump_header(); 1488 } 1489 } 1490 } 1491} 1492 1493// fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1494// record in the case of a segmented heap dump) 1495void VM_HeapDumper::end_of_dump() { 1496 if (writer()->is_open()) { 1497 write_current_dump_record_length(); 1498 1499 // for segmented dump we write the end record 1500 if (is_segmented_dump()) { 1501 writer()->write_u1(HPROF_HEAP_DUMP_END); 1502 writer()->write_u4(0); 1503 writer()->write_u4(0); 1504 } 1505 } 1506} 1507 1508// marks sub-record boundary 1509void HeapObjectDumper::mark_end_of_record() { 1510 dumper()->check_segment_length(); 1511} 1512 1513// writes a HPROF_LOAD_CLASS record for the class (and each of its 1514// array classes) 1515void VM_HeapDumper::do_load_class(Klass* k) { 1516 static u4 class_serial_num = 0; 1517 1518 // len of HPROF_LOAD_CLASS record 1519 u4 remaining = 2*oopSize + 2*sizeof(u4); 1520 1521 // write a HPROF_LOAD_CLASS for the class and each array class 1522 do { 1523 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1524 1525 // class serial number is just a number 1526 writer()->write_u4(++class_serial_num); 1527 1528 // class ID 1529 Klass* klass = k; 1530 writer()->write_classID(klass); 1531 1532 // add the Klass* and class serial number pair 1533 dumper()->add_class_serial_number(klass, class_serial_num); 1534 1535 writer()->write_u4(STACK_TRACE_ID); 1536 1537 // class name ID 1538 Symbol* name = klass->name(); 1539 writer()->write_symbolID(name); 1540 1541 // write a LOAD_CLASS record for the array type (if it exists) 1542 k = klass->array_klass_or_null(); 1543 } while (k != NULL); 1544} 1545 1546// writes a HPROF_GC_CLASS_DUMP record for the given class 1547void VM_HeapDumper::do_class_dump(Klass* k) { 1548 if (k->oop_is_instance()) { 1549 DumperSupport::dump_class_and_array_classes(writer(), k); 1550 } 1551} 1552 1553// writes a HPROF_GC_CLASS_DUMP records for a given basic type 1554// array (and each multi-dimensional array too) 1555void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) { 1556 DumperSupport::dump_basic_type_array_class(writer(), k); 1557} 1558 1559// Walk the stack of the given thread. 1560// Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1561// Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1562// 1563// It returns the number of Java frames in this thread stack 1564int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1565 JNILocalsDumper blk(writer(), thread_serial_num); 1566 1567 oop threadObj = java_thread->threadObj(); 1568 assert(threadObj != NULL, "sanity check"); 1569 1570 int stack_depth = 0; 1571 if (java_thread->has_last_Java_frame()) { 1572 1573 // vframes are resource allocated 1574 Thread* current_thread = Thread::current(); 1575 ResourceMark rm(current_thread); 1576 HandleMark hm(current_thread); 1577 1578 RegisterMap reg_map(java_thread); 1579 frame f = java_thread->last_frame(); 1580 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1581 frame* last_entry_frame = NULL; 1582 int extra_frames = 0; 1583 1584 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1585 extra_frames++; 1586 } 1587 while (vf != NULL) { 1588 blk.set_frame_number(stack_depth); 1589 if (vf->is_java_frame()) { 1590 1591 // java frame (interpreted, compiled, ...) 1592 javaVFrame *jvf = javaVFrame::cast(vf); 1593 if (!(jvf->method()->is_native())) { 1594 StackValueCollection* locals = jvf->locals(); 1595 for (int slot=0; slot<locals->size(); slot++) { 1596 if (locals->at(slot)->type() == T_OBJECT) { 1597 oop o = locals->obj_at(slot)(); 1598 1599 if (o != NULL) { 1600 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1601 writer()->write_objectID(o); 1602 writer()->write_u4(thread_serial_num); 1603 writer()->write_u4((u4) (stack_depth + extra_frames)); 1604 } 1605 } 1606 } 1607 StackValueCollection *exprs = jvf->expressions(); 1608 for(int index = 0; index < exprs->size(); index++) { 1609 if (exprs->at(index)->type() == T_OBJECT) { 1610 oop o = exprs->obj_at(index)(); 1611 if (o != NULL) { 1612 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1613 writer()->write_objectID(o); 1614 writer()->write_u4(thread_serial_num); 1615 writer()->write_u4((u4) (stack_depth + extra_frames)); 1616 } 1617 } 1618 } 1619 } else { 1620 // native frame 1621 if (stack_depth == 0) { 1622 // JNI locals for the top frame. 1623 java_thread->active_handles()->oops_do(&blk); 1624 } else { 1625 if (last_entry_frame != NULL) { 1626 // JNI locals for the entry frame 1627 assert(last_entry_frame->is_entry_frame(), "checking"); 1628 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1629 } 1630 } 1631 } 1632 // increment only for Java frames 1633 stack_depth++; 1634 last_entry_frame = NULL; 1635 1636 } else { 1637 // externalVFrame - if it's an entry frame then report any JNI locals 1638 // as roots when we find the corresponding native javaVFrame 1639 frame* fr = vf->frame_pointer(); 1640 assert(fr != NULL, "sanity check"); 1641 if (fr->is_entry_frame()) { 1642 last_entry_frame = fr; 1643 } 1644 } 1645 vf = vf->sender(); 1646 } 1647 } else { 1648 // no last java frame but there may be JNI locals 1649 java_thread->active_handles()->oops_do(&blk); 1650 } 1651 return stack_depth; 1652} 1653 1654 1655// write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1656// the stack so that locals and JNI locals are dumped. 1657void VM_HeapDumper::do_threads() { 1658 for (int i=0; i < _num_threads; i++) { 1659 JavaThread* thread = _stack_traces[i]->thread(); 1660 oop threadObj = thread->threadObj(); 1661 u4 thread_serial_num = i+1; 1662 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1663 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1664 writer()->write_objectID(threadObj); 1665 writer()->write_u4(thread_serial_num); // thread number 1666 writer()->write_u4(stack_serial_num); // stack trace serial number 1667 int num_frames = do_thread(thread, thread_serial_num); 1668 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1669 "total number of Java frames not matched"); 1670 } 1671} 1672 1673 1674// The VM operation that dumps the heap. The dump consists of the following 1675// records: 1676// 1677// HPROF_HEADER 1678// [HPROF_UTF8]* 1679// [HPROF_LOAD_CLASS]* 1680// [[HPROF_FRAME]*|HPROF_TRACE]* 1681// [HPROF_GC_CLASS_DUMP]* 1682// HPROF_HEAP_DUMP 1683// 1684// The HPROF_TRACE records represent the stack traces where the heap dump 1685// is generated and a "dummy trace" record which does not include 1686// any frames. The dummy trace record is used to be referenced as the 1687// unknown object alloc site. 1688// 1689// The HPROF_HEAP_DUMP record has a length following by sub-records. To allow 1690// the heap dump be generated in a single pass we remember the position of 1691// the dump length and fix it up after all sub-records have been written. 1692// To generate the sub-records we iterate over the heap, writing 1693// HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1694// records as we go. Once that is done we write records for some of the GC 1695// roots. 1696 1697void VM_HeapDumper::doit() { 1698 1699 HandleMark hm; 1700 CollectedHeap* ch = Universe::heap(); 1701 1702 ch->ensure_parsability(false); // must happen, even if collection does 1703 // not happen (e.g. due to GC_locker) 1704 1705 if (_gc_before_heap_dump) { 1706 if (GC_locker::is_active()) { 1707 warning("GC locker is held; pre-heapdump GC was skipped"); 1708 } else { 1709 ch->collect_as_vm_thread(GCCause::_heap_dump); 1710 } 1711 } 1712 1713 // At this point we should be the only dumper active, so 1714 // the following should be safe. 1715 set_global_dumper(); 1716 set_global_writer(); 1717 1718 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1 1719 size_t used = ch->used(); 1720 const char* header; 1721 if (used > (size_t)SegmentedHeapDumpThreshold) { 1722 set_segmented_dump(); 1723 header = "JAVA PROFILE 1.0.2"; 1724 } else { 1725 header = "JAVA PROFILE 1.0.1"; 1726 } 1727 1728 // header is few bytes long - no chance to overflow int 1729 writer()->write_raw((void*)header, (int)strlen(header)); 1730 writer()->write_u1(0); // terminator 1731 writer()->write_u4(oopSize); 1732 writer()->write_u8(os::javaTimeMillis()); 1733 1734 // HPROF_UTF8 records 1735 SymbolTableDumper sym_dumper(writer()); 1736 SymbolTable::symbols_do(&sym_dumper); 1737 1738 // write HPROF_LOAD_CLASS records 1739 ClassLoaderDataGraph::classes_do(&do_load_class); 1740 Universe::basic_type_classes_do(&do_load_class); 1741 1742 // write HPROF_FRAME and HPROF_TRACE records 1743 // this must be called after _klass_map is built when iterating the classes above. 1744 dump_stack_traces(); 1745 1746 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT 1747 write_dump_header(); 1748 1749 // Writes HPROF_GC_CLASS_DUMP records 1750 ClassLoaderDataGraph::classes_do(&do_class_dump); 1751 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1752 check_segment_length(); 1753 1754 // writes HPROF_GC_INSTANCE_DUMP records. 1755 // After each sub-record is written check_segment_length will be invoked. When 1756 // generated a segmented heap dump this allows us to check if the current 1757 // segment exceeds a threshold and if so, then a new segment is started. 1758 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1759 // of the heap dump. 1760 HeapObjectDumper obj_dumper(this, writer()); 1761 Universe::heap()->safe_object_iterate(&obj_dumper); 1762 1763 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1764 do_threads(); 1765 check_segment_length(); 1766 1767 // HPROF_GC_ROOT_MONITOR_USED 1768 MonitorUsedDumper mon_dumper(writer()); 1769 ObjectSynchronizer::oops_do(&mon_dumper); 1770 check_segment_length(); 1771 1772 // HPROF_GC_ROOT_JNI_GLOBAL 1773 JNIGlobalsDumper jni_dumper(writer()); 1774 JNIHandles::oops_do(&jni_dumper); 1775 check_segment_length(); 1776 1777 // HPROF_GC_ROOT_STICKY_CLASS 1778 StickyClassDumper class_dumper(writer()); 1779 SystemDictionary::always_strong_classes_do(&class_dumper); 1780 1781 // fixes up the length of the dump record. In the case of a segmented 1782 // heap then the HPROF_HEAP_DUMP_END record is also written. 1783 end_of_dump(); 1784 1785 // Now we clear the global variables, so that a future dumper might run. 1786 clear_global_dumper(); 1787 clear_global_writer(); 1788} 1789 1790void VM_HeapDumper::dump_stack_traces() { 1791 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1792 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1793 writer()->write_u4((u4) STACK_TRACE_ID); 1794 writer()->write_u4(0); // thread number 1795 writer()->write_u4(0); // frame count 1796 1797 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal); 1798 int frame_serial_num = 0; 1799 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1800 oop threadObj = thread->threadObj(); 1801 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1802 // dump thread stack trace 1803 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1804 stack_trace->dump_stack_at_safepoint(-1); 1805 _stack_traces[_num_threads++] = stack_trace; 1806 1807 // write HPROF_FRAME records for this thread's stack trace 1808 int depth = stack_trace->get_stack_depth(); 1809 int thread_frame_start = frame_serial_num; 1810 int extra_frames = 0; 1811 // write fake frame that makes it look like the thread, which caused OOME, 1812 // is in the OutOfMemoryError zero-parameter constructor 1813 if (thread == _oome_thread && _oome_constructor != NULL) { 1814 int oome_serial_num = _klass_map->find(_oome_constructor->method_holder()); 1815 // the class serial number starts from 1 1816 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1817 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1818 _oome_constructor, 0); 1819 extra_frames++; 1820 } 1821 for (int j=0; j < depth; j++) { 1822 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1823 Method* m = frame->method(); 1824 int class_serial_num = _klass_map->find(m->method_holder()); 1825 // the class serial number starts from 1 1826 assert(class_serial_num > 0, "class not found"); 1827 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1828 } 1829 depth += extra_frames; 1830 1831 // write HPROF_TRACE record for one thread 1832 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1833 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1834 writer()->write_u4(stack_serial_num); // stack trace serial number 1835 writer()->write_u4((u4) _num_threads); // thread serial number 1836 writer()->write_u4(depth); // frame count 1837 for (int j=1; j <= depth; j++) { 1838 writer()->write_id(thread_frame_start + j); 1839 } 1840 } 1841 } 1842} 1843 1844// dump the heap to given path. 1845PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL 1846int HeapDumper::dump(const char* path) { 1847 assert(path != NULL && strlen(path) > 0, "path missing"); 1848 1849 // print message in interactive case 1850 if (print_to_tty()) { 1851 tty->print_cr("Dumping heap to %s ...", path); 1852 timer()->start(); 1853 } 1854 1855 // create the dump writer. If the file can be opened then bail 1856 DumpWriter writer(path); 1857 if (!writer.is_open()) { 1858 set_error(writer.error()); 1859 if (print_to_tty()) { 1860 tty->print_cr("Unable to create %s: %s", path, 1861 (error() != NULL) ? error() : "reason unknown"); 1862 } 1863 return -1; 1864 } 1865 1866 // generate the dump 1867 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1868 if (Thread::current()->is_VM_thread()) { 1869 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1870 dumper.doit(); 1871 } else { 1872 VMThread::execute(&dumper); 1873 } 1874 1875 // close dump file and record any error that the writer may have encountered 1876 writer.close(); 1877 set_error(writer.error()); 1878 1879 // print message in interactive case 1880 if (print_to_tty()) { 1881 timer()->stop(); 1882 if (error() == NULL) { 1883 char msg[256]; 1884 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]", 1885 JLONG_FORMAT, timer()->seconds()); 1886PRAGMA_DIAG_PUSH 1887PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL 1888 tty->print_cr(msg, writer.bytes_written()); 1889PRAGMA_DIAG_POP 1890 } else { 1891 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1892 } 1893 } 1894 1895 return (writer.error() == NULL) ? 0 : -1; 1896} 1897 1898// stop timer (if still active), and free any error string we might be holding 1899HeapDumper::~HeapDumper() { 1900 if (timer()->is_active()) { 1901 timer()->stop(); 1902 } 1903 set_error(NULL); 1904} 1905 1906 1907// returns the error string (resource allocated), or NULL 1908char* HeapDumper::error_as_C_string() const { 1909 if (error() != NULL) { 1910 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1911 strcpy(str, error()); 1912 return str; 1913 } else { 1914 return NULL; 1915 } 1916} 1917 1918// set the error string 1919void HeapDumper::set_error(char* error) { 1920 if (_error != NULL) { 1921 os::free(_error); 1922 } 1923 if (error == NULL) { 1924 _error = NULL; 1925 } else { 1926 _error = os::strdup(error); 1927 assert(_error != NULL, "allocation failure"); 1928 } 1929} 1930 1931// Called by out-of-memory error reporting by a single Java thread 1932// outside of a JVM safepoint 1933void HeapDumper::dump_heap_from_oome() { 1934 HeapDumper::dump_heap(true); 1935} 1936 1937// Called by error reporting by a single Java thread outside of a JVM safepoint, 1938// or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1939// callers are strictly serialized and guaranteed not to interfere below. For more 1940// general use, however, this method will need modification to prevent 1941// inteference when updating the static variables base_path and dump_file_seq below. 1942void HeapDumper::dump_heap() { 1943 HeapDumper::dump_heap(false); 1944} 1945 1946void HeapDumper::dump_heap(bool oome) { 1947 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1948 static uint dump_file_seq = 0; 1949 char* my_path; 1950 const int max_digit_chars = 20; 1951 1952 const char* dump_file_name = "java_pid"; 1953 const char* dump_file_ext = ".hprof"; 1954 1955 // The dump file defaults to java_pid<pid>.hprof in the current working 1956 // directory. HeapDumpPath=<file> can be used to specify an alternative 1957 // dump file name or a directory where dump file is created. 1958 if (dump_file_seq == 0) { // first time in, we initialize base_path 1959 // Calculate potentially longest base path and check if we have enough 1960 // allocated statically. 1961 const size_t total_length = 1962 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + 1963 strlen(os::file_separator()) + max_digit_chars + 1964 strlen(dump_file_name) + strlen(dump_file_ext) + 1; 1965 if (total_length > sizeof(base_path)) { 1966 warning("Cannot create heap dump file. HeapDumpPath is too long."); 1967 return; 1968 } 1969 1970 bool use_default_filename = true; 1971 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 1972 // HeapDumpPath=<file> not specified 1973 } else { 1974 strncpy(base_path, HeapDumpPath, sizeof(base_path)); 1975 // check if the path is a directory (must exist) 1976 DIR* dir = os::opendir(base_path); 1977 if (dir == NULL) { 1978 use_default_filename = false; 1979 } else { 1980 // HeapDumpPath specified a directory. We append a file separator 1981 // (if needed). 1982 os::closedir(dir); 1983 size_t fs_len = strlen(os::file_separator()); 1984 if (strlen(base_path) >= fs_len) { 1985 char* end = base_path; 1986 end += (strlen(base_path) - fs_len); 1987 if (strcmp(end, os::file_separator()) != 0) { 1988 strcat(base_path, os::file_separator()); 1989 } 1990 } 1991 } 1992 } 1993 // If HeapDumpPath wasn't a file name then we append the default name 1994 if (use_default_filename) { 1995 const size_t dlen = strlen(base_path); // if heap dump dir specified 1996 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", 1997 dump_file_name, os::current_process_id(), dump_file_ext); 1998 } 1999 const size_t len = strlen(base_path) + 1; 2000 my_path = (char*)os::malloc(len, mtInternal); 2001 if (my_path == NULL) { 2002 warning("Cannot create heap dump file. Out of system memory."); 2003 return; 2004 } 2005 strncpy(my_path, base_path, len); 2006 } else { 2007 // Append a sequence number id for dumps following the first 2008 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 2009 my_path = (char*)os::malloc(len, mtInternal); 2010 if (my_path == NULL) { 2011 warning("Cannot create heap dump file. Out of system memory."); 2012 return; 2013 } 2014 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); 2015 } 2016 dump_file_seq++; // increment seq number for next time we dump 2017 2018 HeapDumper dumper(false /* no GC before heap dump */, 2019 true /* send to tty */, 2020 oome /* pass along out-of-memory-error flag */); 2021 dumper.dump(my_path); 2022 os::free(my_path); 2023} 2024