heapDumper.cpp revision 2062:3582bf76420e
1/* 2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "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/genCollectedHeap.hpp" 31#include "memory/universe.hpp" 32#include "oops/objArrayKlass.hpp" 33#include "runtime/javaCalls.hpp" 34#include "runtime/jniHandles.hpp" 35#include "runtime/reflectionUtils.hpp" 36#include "runtime/vframe.hpp" 37#include "runtime/vmThread.hpp" 38#include "runtime/vm_operations.hpp" 39#include "services/heapDumper.hpp" 40#include "services/threadService.hpp" 41#include "utilities/ostream.hpp" 42#ifndef SERIALGC 43#include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 44#endif 45 46/* 47 * HPROF binary format - description copied from: 48 * src/share/demo/jvmti/hprof/hprof_io.c 49 * 50 * 51 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2" 52 * (0-terminated) 53 * 54 * u4 size of identifiers. Identifiers are used to represent 55 * UTF8 strings, objects, stack traces, etc. They usually 56 * have the same size as host pointers. For example, on 57 * Solaris and Win32, the size is 4. 58 * u4 high word 59 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 60 * [record]* a sequence of records. 61 * 62 * 63 * Record format: 64 * 65 * u1 a TAG denoting the type of the record 66 * u4 number of *microseconds* since the time stamp in the 67 * header. (wraps around in a little more than an hour) 68 * u4 number of bytes *remaining* in the record. Note that 69 * this number excludes the tag and the length field itself. 70 * [u1]* BODY of the record (a sequence of bytes) 71 * 72 * 73 * The following TAGs are supported: 74 * 75 * TAG BODY notes 76 *---------------------------------------------------------- 77 * HPROF_UTF8 a UTF8-encoded name 78 * 79 * id name ID 80 * [u1]* UTF8 characters (no trailing zero) 81 * 82 * HPROF_LOAD_CLASS a newly loaded class 83 * 84 * u4 class serial number (> 0) 85 * id class object ID 86 * u4 stack trace serial number 87 * id class name ID 88 * 89 * HPROF_UNLOAD_CLASS an unloading class 90 * 91 * u4 class serial_number 92 * 93 * HPROF_FRAME a Java stack frame 94 * 95 * id stack frame ID 96 * id method name ID 97 * id method signature ID 98 * id source file name ID 99 * u4 class serial number 100 * i4 line number. >0: normal 101 * -1: unknown 102 * -2: compiled method 103 * -3: native method 104 * 105 * HPROF_TRACE a Java stack trace 106 * 107 * u4 stack trace serial number 108 * u4 thread serial number 109 * u4 number of frames 110 * [id]* stack frame IDs 111 * 112 * 113 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC 114 * 115 * u2 flags 0x0001: incremental vs. complete 116 * 0x0002: sorted by allocation vs. live 117 * 0x0004: whether to force a GC 118 * u4 cutoff ratio 119 * u4 total live bytes 120 * u4 total live instances 121 * u8 total bytes allocated 122 * u8 total instances allocated 123 * u4 number of sites that follow 124 * [u1 is_array: 0: normal object 125 * 2: object array 126 * 4: boolean array 127 * 5: char array 128 * 6: float array 129 * 7: double array 130 * 8: byte array 131 * 9: short array 132 * 10: int array 133 * 11: long array 134 * u4 class serial number (may be zero during startup) 135 * u4 stack trace serial number 136 * u4 number of bytes alive 137 * u4 number of instances alive 138 * u4 number of bytes allocated 139 * u4]* number of instance allocated 140 * 141 * HPROF_START_THREAD a newly started thread. 142 * 143 * u4 thread serial number (> 0) 144 * id thread object ID 145 * u4 stack trace serial number 146 * id thread name ID 147 * id thread group name ID 148 * id thread group parent name ID 149 * 150 * HPROF_END_THREAD a terminating thread. 151 * 152 * u4 thread serial number 153 * 154 * HPROF_HEAP_SUMMARY heap summary 155 * 156 * u4 total live bytes 157 * u4 total live instances 158 * u8 total bytes allocated 159 * u8 total instances allocated 160 * 161 * HPROF_HEAP_DUMP denote a heap dump 162 * 163 * [heap dump sub-records]* 164 * 165 * There are four kinds of heap dump sub-records: 166 * 167 * u1 sub-record type 168 * 169 * HPROF_GC_ROOT_UNKNOWN unknown root 170 * 171 * id object ID 172 * 173 * HPROF_GC_ROOT_THREAD_OBJ thread object 174 * 175 * id thread object ID (may be 0 for a 176 * thread newly attached through JNI) 177 * u4 thread sequence number 178 * u4 stack trace sequence number 179 * 180 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root 181 * 182 * id object ID 183 * id JNI global ref ID 184 * 185 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref 186 * 187 * id object ID 188 * u4 thread serial number 189 * u4 frame # in stack trace (-1 for empty) 190 * 191 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame 192 * 193 * id object ID 194 * u4 thread serial number 195 * u4 frame # in stack trace (-1 for empty) 196 * 197 * HPROF_GC_ROOT_NATIVE_STACK Native stack 198 * 199 * id object ID 200 * u4 thread serial number 201 * 202 * HPROF_GC_ROOT_STICKY_CLASS System class 203 * 204 * id object ID 205 * 206 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block 207 * 208 * id object ID 209 * u4 thread serial number 210 * 211 * HPROF_GC_ROOT_MONITOR_USED Busy monitor 212 * 213 * id object ID 214 * 215 * HPROF_GC_CLASS_DUMP dump of a class object 216 * 217 * id class object ID 218 * u4 stack trace serial number 219 * id super class object ID 220 * id class loader object ID 221 * id signers object ID 222 * id protection domain object ID 223 * id reserved 224 * id reserved 225 * 226 * u4 instance size (in bytes) 227 * 228 * u2 size of constant pool 229 * [u2, constant pool index, 230 * ty, type 231 * 2: object 232 * 4: boolean 233 * 5: char 234 * 6: float 235 * 7: double 236 * 8: byte 237 * 9: short 238 * 10: int 239 * 11: long 240 * vl]* and value 241 * 242 * u2 number of static fields 243 * [id, static field name, 244 * ty, type, 245 * vl]* and value 246 * 247 * u2 number of inst. fields (not inc. super) 248 * [id, instance field name, 249 * ty]* type 250 * 251 * HPROF_GC_INSTANCE_DUMP dump of a normal object 252 * 253 * id object ID 254 * u4 stack trace serial number 255 * id class object ID 256 * u4 number of bytes that follow 257 * [vl]* instance field values (class, followed 258 * by super, super's super ...) 259 * 260 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array 261 * 262 * id array object ID 263 * u4 stack trace serial number 264 * u4 number of elements 265 * id array class ID 266 * [id]* elements 267 * 268 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array 269 * 270 * id array object ID 271 * u4 stack trace serial number 272 * u4 number of elements 273 * u1 element type 274 * 4: boolean array 275 * 5: char array 276 * 6: float array 277 * 7: double array 278 * 8: byte array 279 * 9: short array 280 * 10: int array 281 * 11: long array 282 * [u1]* elements 283 * 284 * HPROF_CPU_SAMPLES a set of sample traces of running threads 285 * 286 * u4 total number of samples 287 * u4 # of traces 288 * [u4 # of samples 289 * u4]* stack trace serial number 290 * 291 * HPROF_CONTROL_SETTINGS the settings of on/off switches 292 * 293 * u4 0x00000001: alloc traces on/off 294 * 0x00000002: cpu sampling on/off 295 * u2 stack trace depth 296 * 297 * 298 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally 299 * be generated as a sequence of heap dump segments. This sequence is 300 * terminated by an end record. The additional tags allowed by format 301 * "JAVA PROFILE 1.0.2" are: 302 * 303 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment 304 * 305 * [heap dump sub-records]* 306 * The same sub-record types allowed by HPROF_HEAP_DUMP 307 * 308 * HPROF_HEAP_DUMP_END denotes the end of a heap dump 309 * 310 */ 311 312 313// HPROF tags 314 315typedef enum { 316 // top-level records 317 HPROF_UTF8 = 0x01, 318 HPROF_LOAD_CLASS = 0x02, 319 HPROF_UNLOAD_CLASS = 0x03, 320 HPROF_FRAME = 0x04, 321 HPROF_TRACE = 0x05, 322 HPROF_ALLOC_SITES = 0x06, 323 HPROF_HEAP_SUMMARY = 0x07, 324 HPROF_START_THREAD = 0x0A, 325 HPROF_END_THREAD = 0x0B, 326 HPROF_HEAP_DUMP = 0x0C, 327 HPROF_CPU_SAMPLES = 0x0D, 328 HPROF_CONTROL_SETTINGS = 0x0E, 329 330 // 1.0.2 record types 331 HPROF_HEAP_DUMP_SEGMENT = 0x1C, 332 HPROF_HEAP_DUMP_END = 0x2C, 333 334 // field types 335 HPROF_ARRAY_OBJECT = 0x01, 336 HPROF_NORMAL_OBJECT = 0x02, 337 HPROF_BOOLEAN = 0x04, 338 HPROF_CHAR = 0x05, 339 HPROF_FLOAT = 0x06, 340 HPROF_DOUBLE = 0x07, 341 HPROF_BYTE = 0x08, 342 HPROF_SHORT = 0x09, 343 HPROF_INT = 0x0A, 344 HPROF_LONG = 0x0B, 345 346 // data-dump sub-records 347 HPROF_GC_ROOT_UNKNOWN = 0xFF, 348 HPROF_GC_ROOT_JNI_GLOBAL = 0x01, 349 HPROF_GC_ROOT_JNI_LOCAL = 0x02, 350 HPROF_GC_ROOT_JAVA_FRAME = 0x03, 351 HPROF_GC_ROOT_NATIVE_STACK = 0x04, 352 HPROF_GC_ROOT_STICKY_CLASS = 0x05, 353 HPROF_GC_ROOT_THREAD_BLOCK = 0x06, 354 HPROF_GC_ROOT_MONITOR_USED = 0x07, 355 HPROF_GC_ROOT_THREAD_OBJ = 0x08, 356 HPROF_GC_CLASS_DUMP = 0x20, 357 HPROF_GC_INSTANCE_DUMP = 0x21, 358 HPROF_GC_OBJ_ARRAY_DUMP = 0x22, 359 HPROF_GC_PRIM_ARRAY_DUMP = 0x23 360} hprofTag; 361 362// Default stack trace ID (used for dummy HPROF_TRACE record) 363enum { 364 STACK_TRACE_ID = 1, 365 INITIAL_CLASS_COUNT = 200 366}; 367 368// Supports I/O operations on a dump file 369 370class DumpWriter : public StackObj { 371 private: 372 enum { 373 io_buffer_size = 8*M 374 }; 375 376 int _fd; // file descriptor (-1 if dump file not open) 377 jlong _bytes_written; // number of byte written to dump file 378 379 char* _buffer; // internal buffer 380 int _size; 381 int _pos; 382 383 char* _error; // error message when I/O fails 384 385 void set_file_descriptor(int fd) { _fd = fd; } 386 int file_descriptor() const { return _fd; } 387 388 char* buffer() const { return _buffer; } 389 int buffer_size() const { return _size; } 390 int position() const { return _pos; } 391 void set_position(int pos) { _pos = pos; } 392 393 void set_error(const char* error) { _error = (char*)os::strdup(error); } 394 395 // all I/O go through this function 396 void write_internal(void* s, int len); 397 398 public: 399 DumpWriter(const char* path); 400 ~DumpWriter(); 401 402 void close(); 403 bool is_open() const { return file_descriptor() >= 0; } 404 void flush(); 405 406 // total number of bytes written to the disk 407 jlong bytes_written() const { return _bytes_written; } 408 409 // adjust the number of bytes written to disk (used to keep the count 410 // of the number of bytes written in case of rewrites) 411 void adjust_bytes_written(jlong n) { _bytes_written += n; } 412 413 // number of (buffered) bytes as yet unwritten to the dump file 414 jlong bytes_unwritten() const { return (jlong)position(); } 415 416 char* error() const { return _error; } 417 418 jlong current_offset(); 419 void seek_to_offset(jlong pos); 420 421 // writer functions 422 void write_raw(void* s, int len); 423 void write_u1(u1 x) { write_raw((void*)&x, 1); } 424 void write_u2(u2 x); 425 void write_u4(u4 x); 426 void write_u8(u8 x); 427 void write_objectID(oop o); 428 void write_symbolID(Symbol* o); 429 void write_classID(Klass* k); 430 void write_id(u4 x); 431}; 432 433DumpWriter::DumpWriter(const char* path) { 434 // try to allocate an I/O buffer of io_buffer_size. If there isn't 435 // sufficient memory then reduce size until we can allocate something. 436 _size = io_buffer_size; 437 do { 438 _buffer = (char*)os::malloc(_size); 439 if (_buffer == NULL) { 440 _size = _size >> 1; 441 } 442 } while (_buffer == NULL && _size > 0); 443 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); 444 _pos = 0; 445 _error = NULL; 446 _bytes_written = 0L; 447 _fd = os::create_binary_file(path, false); // don't replace existing file 448 449 // if the open failed we record the error 450 if (_fd < 0) { 451 _error = (char*)os::strdup(strerror(errno)); 452 } 453} 454 455DumpWriter::~DumpWriter() { 456 // flush and close dump file 457 if (is_open()) { 458 close(); 459 } 460 if (_buffer != NULL) os::free(_buffer); 461 if (_error != NULL) os::free(_error); 462} 463 464// closes dump file (if open) 465void DumpWriter::close() { 466 // flush and close dump file 467 if (is_open()) { 468 flush(); 469 ::close(file_descriptor()); 470 set_file_descriptor(-1); 471 } 472} 473 474// write directly to the file 475void DumpWriter::write_internal(void* s, int len) { 476 if (is_open()) { 477 int n = ::write(file_descriptor(), s, len); 478 if (n > 0) { 479 _bytes_written += n; 480 } 481 if (n != len) { 482 if (n < 0) { 483 set_error(strerror(errno)); 484 } else { 485 set_error("file size limit"); 486 } 487 ::close(file_descriptor()); 488 set_file_descriptor(-1); 489 } 490 } 491} 492 493// write raw bytes 494void DumpWriter::write_raw(void* s, int len) { 495 if (is_open()) { 496 // flush buffer to make toom 497 if ((position()+ len) >= buffer_size()) { 498 flush(); 499 } 500 501 // buffer not available or too big to buffer it 502 if ((buffer() == NULL) || (len >= buffer_size())) { 503 write_internal(s, len); 504 } else { 505 // Should optimize this for u1/u2/u4/u8 sizes. 506 memcpy(buffer() + position(), s, len); 507 set_position(position() + len); 508 } 509 } 510} 511 512// flush any buffered bytes to the file 513void DumpWriter::flush() { 514 if (is_open() && position() > 0) { 515 write_internal(buffer(), position()); 516 set_position(0); 517 } 518} 519 520 521jlong DumpWriter::current_offset() { 522 if (is_open()) { 523 // the offset is the file offset plus whatever we have buffered 524 jlong offset = os::current_file_offset(file_descriptor()); 525 assert(offset >= 0, "lseek failed"); 526 return offset + (jlong)position(); 527 } else { 528 return (jlong)-1; 529 } 530} 531 532void DumpWriter::seek_to_offset(jlong off) { 533 assert(off >= 0, "bad offset"); 534 535 // need to flush before seeking 536 flush(); 537 538 // may be closed due to I/O error 539 if (is_open()) { 540 jlong n = os::seek_to_file_offset(file_descriptor(), off); 541 assert(n >= 0, "lseek failed"); 542 } 543} 544 545void DumpWriter::write_u2(u2 x) { 546 u2 v; 547 Bytes::put_Java_u2((address)&v, x); 548 write_raw((void*)&v, 2); 549} 550 551void DumpWriter::write_u4(u4 x) { 552 u4 v; 553 Bytes::put_Java_u4((address)&v, x); 554 write_raw((void*)&v, 4); 555} 556 557void DumpWriter::write_u8(u8 x) { 558 u8 v; 559 Bytes::put_Java_u8((address)&v, x); 560 write_raw((void*)&v, 8); 561} 562 563void DumpWriter::write_objectID(oop o) { 564 address a = (address)((uintptr_t)o); 565#ifdef _LP64 566 write_u8((u8)a); 567#else 568 write_u4((u4)a); 569#endif 570} 571 572void DumpWriter::write_symbolID(Symbol* s) { 573 address a = (address)((uintptr_t)s); 574#ifdef _LP64 575 write_u8((u8)a); 576#else 577 write_u4((u4)a); 578#endif 579} 580 581void DumpWriter::write_id(u4 x) { 582#ifdef _LP64 583 write_u8((u8) x); 584#else 585 write_u4(x); 586#endif 587} 588 589// We use java mirror as the class ID 590void DumpWriter::write_classID(Klass* k) { 591 write_objectID(k->java_mirror()); 592} 593 594 595 596// Support class with a collection of functions used when dumping the heap 597 598class DumperSupport : AllStatic { 599 public: 600 601 // write a header of the given type 602 static void write_header(DumpWriter* writer, hprofTag tag, u4 len); 603 604 // returns hprof tag for the given type signature 605 static hprofTag sig2tag(Symbol* sig); 606 // returns hprof tag for the given basic type 607 static hprofTag type2tag(BasicType type); 608 609 // returns the size of the instance of the given class 610 static u4 instance_size(klassOop k); 611 612 // dump a jfloat 613 static void dump_float(DumpWriter* writer, jfloat f); 614 // dump a jdouble 615 static void dump_double(DumpWriter* writer, jdouble d); 616 // dumps the raw value of the given field 617 static void dump_field_value(DumpWriter* writer, char type, address addr); 618 // dumps static fields of the given class 619 static void dump_static_fields(DumpWriter* writer, klassOop k); 620 // dump the raw values of the instance fields of the given object 621 static void dump_instance_fields(DumpWriter* writer, oop o); 622 // dumps the definition of the instance fields for a given class 623 static void dump_instance_field_descriptors(DumpWriter* writer, klassOop k); 624 // creates HPROF_GC_INSTANCE_DUMP record for the given object 625 static void dump_instance(DumpWriter* writer, oop o); 626 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its 627 // array classes 628 static void dump_class_and_array_classes(DumpWriter* writer, klassOop k); 629 // creates HPROF_GC_CLASS_DUMP record for a given primitive array 630 // class (and each multi-dimensional array class too) 631 static void dump_basic_type_array_class(DumpWriter* writer, klassOop k); 632 633 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 634 static void dump_object_array(DumpWriter* writer, objArrayOop array); 635 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 636 static void dump_prim_array(DumpWriter* writer, typeArrayOop array); 637 // create HPROF_FRAME record for the given method and bci 638 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, methodOop m, int bci); 639}; 640 641// write a header of the given type 642void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { 643 writer->write_u1((u1)tag); 644 writer->write_u4(0); // current ticks 645 writer->write_u4(len); 646} 647 648// returns hprof tag for the given type signature 649hprofTag DumperSupport::sig2tag(Symbol* sig) { 650 switch (sig->byte_at(0)) { 651 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; 652 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; 653 case JVM_SIGNATURE_BYTE : return HPROF_BYTE; 654 case JVM_SIGNATURE_CHAR : return HPROF_CHAR; 655 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; 656 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; 657 case JVM_SIGNATURE_INT : return HPROF_INT; 658 case JVM_SIGNATURE_LONG : return HPROF_LONG; 659 case JVM_SIGNATURE_SHORT : return HPROF_SHORT; 660 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; 661 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 662 } 663} 664 665hprofTag DumperSupport::type2tag(BasicType type) { 666 switch (type) { 667 case T_BYTE : return HPROF_BYTE; 668 case T_CHAR : return HPROF_CHAR; 669 case T_FLOAT : return HPROF_FLOAT; 670 case T_DOUBLE : return HPROF_DOUBLE; 671 case T_INT : return HPROF_INT; 672 case T_LONG : return HPROF_LONG; 673 case T_SHORT : return HPROF_SHORT; 674 case T_BOOLEAN : return HPROF_BOOLEAN; 675 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; 676 } 677} 678 679// dump a jfloat 680void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { 681 if (g_isnan(f)) { 682 writer->write_u4(0x7fc00000); // collapsing NaNs 683 } else { 684 union { 685 int i; 686 float f; 687 } u; 688 u.f = (float)f; 689 writer->write_u4((u4)u.i); 690 } 691} 692 693// dump a jdouble 694void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { 695 union { 696 jlong l; 697 double d; 698 } u; 699 if (g_isnan(d)) { // collapsing NaNs 700 u.l = (jlong)(0x7ff80000); 701 u.l = (u.l << 32); 702 } else { 703 u.d = (double)d; 704 } 705 writer->write_u8((u8)u.l); 706} 707 708// dumps the raw value of the given field 709void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { 710 switch (type) { 711 case JVM_SIGNATURE_CLASS : 712 case JVM_SIGNATURE_ARRAY : { 713 oop o; 714 if (UseCompressedOops) { 715 o = oopDesc::load_decode_heap_oop((narrowOop*)addr); 716 } else { 717 o = oopDesc::load_decode_heap_oop((oop*)addr); 718 } 719 720 // reflection and sun.misc.Unsafe classes may have a reference to a 721 // klassOop so filter it out. 722 if (o != NULL && o->is_klass()) { 723 o = NULL; 724 } 725 726 // FIXME: When sharing is enabled we don't emit field references to objects 727 // in shared spaces. We can remove this once we write records for the classes 728 // and strings that are shared. 729 if (o != NULL && o->is_shared()) { 730 o = NULL; 731 } 732 writer->write_objectID(o); 733 break; 734 } 735 case JVM_SIGNATURE_BYTE : { 736 jbyte* b = (jbyte*)addr; 737 writer->write_u1((u1)*b); 738 break; 739 } 740 case JVM_SIGNATURE_CHAR : { 741 jchar* c = (jchar*)addr; 742 writer->write_u2((u2)*c); 743 break; 744 } 745 case JVM_SIGNATURE_SHORT : { 746 jshort* s = (jshort*)addr; 747 writer->write_u2((u2)*s); 748 break; 749 } 750 case JVM_SIGNATURE_FLOAT : { 751 jfloat* f = (jfloat*)addr; 752 dump_float(writer, *f); 753 break; 754 } 755 case JVM_SIGNATURE_DOUBLE : { 756 jdouble* f = (jdouble*)addr; 757 dump_double(writer, *f); 758 break; 759 } 760 case JVM_SIGNATURE_INT : { 761 jint* i = (jint*)addr; 762 writer->write_u4((u4)*i); 763 break; 764 } 765 case JVM_SIGNATURE_LONG : { 766 jlong* l = (jlong*)addr; 767 writer->write_u8((u8)*l); 768 break; 769 } 770 case JVM_SIGNATURE_BOOLEAN : { 771 jboolean* b = (jboolean*)addr; 772 writer->write_u1((u1)*b); 773 break; 774 } 775 default : ShouldNotReachHere(); 776 } 777} 778 779// returns the size of the instance of the given class 780u4 DumperSupport::instance_size(klassOop k) { 781 HandleMark hm; 782 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 783 784 int size = 0; 785 786 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 787 if (!fld.access_flags().is_static()) { 788 Symbol* sig = fld.signature(); 789 switch (sig->byte_at(0)) { 790 case JVM_SIGNATURE_CLASS : 791 case JVM_SIGNATURE_ARRAY : size += oopSize; break; 792 793 case JVM_SIGNATURE_BYTE : 794 case JVM_SIGNATURE_BOOLEAN : size += 1; break; 795 796 case JVM_SIGNATURE_CHAR : 797 case JVM_SIGNATURE_SHORT : size += 2; break; 798 799 case JVM_SIGNATURE_INT : 800 case JVM_SIGNATURE_FLOAT : size += 4; break; 801 802 case JVM_SIGNATURE_LONG : 803 case JVM_SIGNATURE_DOUBLE : size += 8; break; 804 805 default : ShouldNotReachHere(); 806 } 807 } 808 } 809 return (u4)size; 810} 811 812// dumps static fields of the given class 813void DumperSupport::dump_static_fields(DumpWriter* writer, klassOop k) { 814 HandleMark hm; 815 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 816 817 // pass 1 - count the static fields 818 u2 field_count = 0; 819 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 820 if (fldc.access_flags().is_static()) field_count++; 821 } 822 823 writer->write_u2(field_count); 824 825 // pass 2 - dump the field descriptors and raw values 826 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 827 if (fld.access_flags().is_static()) { 828 Symbol* sig = fld.signature(); 829 830 writer->write_symbolID(fld.name()); // name 831 writer->write_u1(sig2tag(sig)); // type 832 833 // value 834 int offset = fld.offset(); 835 address addr = (address)k + offset; 836 837 dump_field_value(writer, sig->byte_at(0), addr); 838 } 839 } 840} 841 842// dump the raw values of the instance fields of the given object 843void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { 844 HandleMark hm; 845 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass()); 846 847 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) { 848 if (!fld.access_flags().is_static()) { 849 Symbol* sig = fld.signature(); 850 address addr = (address)o + fld.offset(); 851 852 dump_field_value(writer, sig->byte_at(0), addr); 853 } 854 } 855} 856 857// dumps the definition of the instance fields for a given class 858void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, klassOop k) { 859 HandleMark hm; 860 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k); 861 862 // pass 1 - count the instance fields 863 u2 field_count = 0; 864 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) { 865 if (!fldc.access_flags().is_static()) field_count++; 866 } 867 868 writer->write_u2(field_count); 869 870 // pass 2 - dump the field descriptors 871 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) { 872 if (!fld.access_flags().is_static()) { 873 Symbol* sig = fld.signature(); 874 875 writer->write_symbolID(fld.name()); // name 876 writer->write_u1(sig2tag(sig)); // type 877 } 878 } 879} 880 881// creates HPROF_GC_INSTANCE_DUMP record for the given object 882void DumperSupport::dump_instance(DumpWriter* writer, oop o) { 883 klassOop k = o->klass(); 884 885 writer->write_u1(HPROF_GC_INSTANCE_DUMP); 886 writer->write_objectID(o); 887 writer->write_u4(STACK_TRACE_ID); 888 889 // class ID 890 writer->write_classID(Klass::cast(k)); 891 892 // number of bytes that follow 893 writer->write_u4(instance_size(k) ); 894 895 // field values 896 dump_instance_fields(writer, o); 897} 898 899// creates HPROF_GC_CLASS_DUMP record for the given class and each of 900// its array classes 901void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, klassOop k) { 902 Klass* klass = Klass::cast(k); 903 assert(klass->oop_is_instance(), "not an instanceKlass"); 904 instanceKlass* ik = (instanceKlass*)klass; 905 906 writer->write_u1(HPROF_GC_CLASS_DUMP); 907 908 // class ID 909 writer->write_classID(ik); 910 writer->write_u4(STACK_TRACE_ID); 911 912 // super class ID 913 klassOop java_super = ik->java_super(); 914 if (java_super == NULL) { 915 writer->write_objectID(NULL); 916 } else { 917 writer->write_classID(Klass::cast(java_super)); 918 } 919 920 writer->write_objectID(ik->class_loader()); 921 writer->write_objectID(ik->signers()); 922 writer->write_objectID(ik->protection_domain()); 923 924 // reserved 925 writer->write_objectID(NULL); 926 writer->write_objectID(NULL); 927 928 // instance size 929 writer->write_u4(DumperSupport::instance_size(k)); 930 931 // size of constant pool - ignored by HAT 1.1 932 writer->write_u2(0); 933 934 // number of static fields 935 dump_static_fields(writer, k); 936 937 // description of instance fields 938 dump_instance_field_descriptors(writer, k); 939 940 // array classes 941 k = klass->array_klass_or_null(); 942 while (k != NULL) { 943 Klass* klass = Klass::cast(k); 944 assert(klass->oop_is_objArray(), "not an objArrayKlass"); 945 946 writer->write_u1(HPROF_GC_CLASS_DUMP); 947 writer->write_classID(klass); 948 writer->write_u4(STACK_TRACE_ID); 949 950 // super class of array classes is java.lang.Object 951 java_super = klass->java_super(); 952 assert(java_super != NULL, "checking"); 953 writer->write_classID(Klass::cast(java_super)); 954 955 writer->write_objectID(ik->class_loader()); 956 writer->write_objectID(ik->signers()); 957 writer->write_objectID(ik->protection_domain()); 958 959 writer->write_objectID(NULL); // reserved 960 writer->write_objectID(NULL); 961 writer->write_u4(0); // instance size 962 writer->write_u2(0); // constant pool 963 writer->write_u2(0); // static fields 964 writer->write_u2(0); // instance fields 965 966 // get the array class for the next rank 967 k = klass->array_klass_or_null(); 968 } 969} 970 971// creates HPROF_GC_CLASS_DUMP record for a given primitive array 972// class (and each multi-dimensional array class too) 973void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, klassOop k) { 974 // array classes 975 while (k != NULL) { 976 Klass* klass = Klass::cast(k); 977 978 writer->write_u1(HPROF_GC_CLASS_DUMP); 979 writer->write_classID(klass); 980 writer->write_u4(STACK_TRACE_ID); 981 982 // super class of array classes is java.lang.Object 983 klassOop java_super = klass->java_super(); 984 assert(java_super != NULL, "checking"); 985 writer->write_classID(Klass::cast(java_super)); 986 987 writer->write_objectID(NULL); // loader 988 writer->write_objectID(NULL); // signers 989 writer->write_objectID(NULL); // protection domain 990 991 writer->write_objectID(NULL); // reserved 992 writer->write_objectID(NULL); 993 writer->write_u4(0); // instance size 994 writer->write_u2(0); // constant pool 995 writer->write_u2(0); // static fields 996 writer->write_u2(0); // instance fields 997 998 // get the array class for the next rank 999 k = klass->array_klass_or_null(); 1000 } 1001} 1002 1003// creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array 1004void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { 1005 1006 // filter this 1007 if (array->klass() == Universe::systemObjArrayKlassObj()) return; 1008 1009 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); 1010 writer->write_objectID(array); 1011 writer->write_u4(STACK_TRACE_ID); 1012 writer->write_u4((u4)array->length()); 1013 1014 // array class ID 1015 writer->write_classID(Klass::cast(array->klass())); 1016 1017 // [id]* elements 1018 for (int index=0; index<array->length(); index++) { 1019 oop o = array->obj_at(index); 1020 writer->write_objectID(o); 1021 } 1022} 1023 1024#define WRITE_ARRAY(Array, Type, Size) \ 1025 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); } 1026 1027 1028// creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array 1029void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { 1030 BasicType type = typeArrayKlass::cast(array->klass())->element_type(); 1031 1032 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); 1033 writer->write_objectID(array); 1034 writer->write_u4(STACK_TRACE_ID); 1035 writer->write_u4((u4)array->length()); 1036 writer->write_u1(type2tag(type)); 1037 1038 // nothing to copy 1039 if (array->length() == 0) { 1040 return; 1041 } 1042 1043 // If the byte ordering is big endian then we can copy most types directly 1044 int length_in_bytes = array->length() * type2aelembytes(type); 1045 assert(length_in_bytes > 0, "nothing to copy"); 1046 1047 switch (type) { 1048 case T_INT : { 1049 if (Bytes::is_Java_byte_ordering_different()) { 1050 WRITE_ARRAY(array, int, u4); 1051 } else { 1052 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); 1053 } 1054 break; 1055 } 1056 case T_BYTE : { 1057 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); 1058 break; 1059 } 1060 case T_CHAR : { 1061 if (Bytes::is_Java_byte_ordering_different()) { 1062 WRITE_ARRAY(array, char, u2); 1063 } else { 1064 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); 1065 } 1066 break; 1067 } 1068 case T_SHORT : { 1069 if (Bytes::is_Java_byte_ordering_different()) { 1070 WRITE_ARRAY(array, short, u2); 1071 } else { 1072 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); 1073 } 1074 break; 1075 } 1076 case T_BOOLEAN : { 1077 if (Bytes::is_Java_byte_ordering_different()) { 1078 WRITE_ARRAY(array, bool, u1); 1079 } else { 1080 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); 1081 } 1082 break; 1083 } 1084 case T_LONG : { 1085 if (Bytes::is_Java_byte_ordering_different()) { 1086 WRITE_ARRAY(array, long, u8); 1087 } else { 1088 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); 1089 } 1090 break; 1091 } 1092 1093 // handle float/doubles in a special value to ensure than NaNs are 1094 // written correctly. TO DO: Check if we can avoid this on processors that 1095 // use IEEE 754. 1096 1097 case T_FLOAT : { 1098 for (int i=0; i<array->length(); i++) { 1099 dump_float( writer, array->float_at(i) ); 1100 } 1101 break; 1102 } 1103 case T_DOUBLE : { 1104 for (int i=0; i<array->length(); i++) { 1105 dump_double( writer, array->double_at(i) ); 1106 } 1107 break; 1108 } 1109 default : ShouldNotReachHere(); 1110 } 1111} 1112 1113// create a HPROF_FRAME record of the given methodOop and bci 1114void DumperSupport::dump_stack_frame(DumpWriter* writer, 1115 int frame_serial_num, 1116 int class_serial_num, 1117 methodOop m, 1118 int bci) { 1119 int line_number; 1120 if (m->is_native()) { 1121 line_number = -3; // native frame 1122 } else { 1123 line_number = m->line_number_from_bci(bci); 1124 } 1125 1126 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); 1127 writer->write_id(frame_serial_num); // frame serial number 1128 writer->write_symbolID(m->name()); // method's name 1129 writer->write_symbolID(m->signature()); // method's signature 1130 1131 assert(Klass::cast(m->method_holder())->oop_is_instance(), "not instanceKlass"); 1132 writer->write_symbolID(instanceKlass::cast(m->method_holder())->source_file_name()); // source file name 1133 writer->write_u4(class_serial_num); // class serial number 1134 writer->write_u4((u4) line_number); // line number 1135} 1136 1137 1138// Support class used to generate HPROF_UTF8 records from the entries in the 1139// SymbolTable. 1140 1141class SymbolTableDumper : public SymbolClosure { 1142 private: 1143 DumpWriter* _writer; 1144 DumpWriter* writer() const { return _writer; } 1145 public: 1146 SymbolTableDumper(DumpWriter* writer) { _writer = writer; } 1147 void do_symbol(Symbol** p); 1148}; 1149 1150void SymbolTableDumper::do_symbol(Symbol** p) { 1151 ResourceMark rm; 1152 Symbol* sym = load_symbol(p); 1153 int len = sym->utf8_length(); 1154 if (len > 0) { 1155 char* s = sym->as_utf8(); 1156 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); 1157 writer()->write_symbolID(sym); 1158 writer()->write_raw(s, len); 1159 } 1160} 1161 1162// Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records 1163 1164class JNILocalsDumper : public OopClosure { 1165 private: 1166 DumpWriter* _writer; 1167 u4 _thread_serial_num; 1168 int _frame_num; 1169 DumpWriter* writer() const { return _writer; } 1170 public: 1171 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { 1172 _writer = writer; 1173 _thread_serial_num = thread_serial_num; 1174 _frame_num = -1; // default - empty stack 1175 } 1176 void set_frame_number(int n) { _frame_num = n; } 1177 void do_oop(oop* obj_p); 1178 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1179}; 1180 1181 1182void JNILocalsDumper::do_oop(oop* obj_p) { 1183 // ignore null or deleted handles 1184 oop o = *obj_p; 1185 if (o != NULL && o != JNIHandles::deleted_handle()) { 1186 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); 1187 writer()->write_objectID(o); 1188 writer()->write_u4(_thread_serial_num); 1189 writer()->write_u4((u4)_frame_num); 1190 } 1191} 1192 1193 1194// Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records 1195 1196class JNIGlobalsDumper : public OopClosure { 1197 private: 1198 DumpWriter* _writer; 1199 DumpWriter* writer() const { return _writer; } 1200 1201 public: 1202 JNIGlobalsDumper(DumpWriter* writer) { 1203 _writer = writer; 1204 } 1205 void do_oop(oop* obj_p); 1206 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1207}; 1208 1209void JNIGlobalsDumper::do_oop(oop* obj_p) { 1210 oop o = *obj_p; 1211 1212 // ignore these 1213 if (o == NULL || o == JNIHandles::deleted_handle()) return; 1214 1215 // we ignore global ref to symbols and other internal objects 1216 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { 1217 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); 1218 writer()->write_objectID(o); 1219 writer()->write_objectID((oopDesc*)obj_p); // global ref ID 1220 } 1221}; 1222 1223 1224// Support class used to generate HPROF_GC_ROOT_MONITOR_USED records 1225 1226class MonitorUsedDumper : public OopClosure { 1227 private: 1228 DumpWriter* _writer; 1229 DumpWriter* writer() const { return _writer; } 1230 public: 1231 MonitorUsedDumper(DumpWriter* writer) { 1232 _writer = writer; 1233 } 1234 void do_oop(oop* obj_p) { 1235 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); 1236 writer()->write_objectID(*obj_p); 1237 } 1238 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1239}; 1240 1241 1242// Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records 1243 1244class StickyClassDumper : public OopClosure { 1245 private: 1246 DumpWriter* _writer; 1247 DumpWriter* writer() const { return _writer; } 1248 public: 1249 StickyClassDumper(DumpWriter* writer) { 1250 _writer = writer; 1251 } 1252 void do_oop(oop* obj_p); 1253 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } 1254}; 1255 1256void StickyClassDumper::do_oop(oop* obj_p) { 1257 if (*obj_p != NULL) { 1258 oop o = *obj_p; 1259 if (o->is_klass()) { 1260 klassOop k = klassOop(o); 1261 if (Klass::cast(k)->oop_is_instance()) { 1262 instanceKlass* ik = instanceKlass::cast(k); 1263 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); 1264 writer()->write_classID(ik); 1265 } 1266 } 1267 } 1268} 1269 1270 1271class VM_HeapDumper; 1272 1273// Support class using when iterating over the heap. 1274 1275class HeapObjectDumper : public ObjectClosure { 1276 private: 1277 VM_HeapDumper* _dumper; 1278 DumpWriter* _writer; 1279 1280 VM_HeapDumper* dumper() { return _dumper; } 1281 DumpWriter* writer() { return _writer; } 1282 1283 // used to indicate that a record has been writen 1284 void mark_end_of_record(); 1285 1286 public: 1287 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { 1288 _dumper = dumper; 1289 _writer = writer; 1290 } 1291 1292 // called for each object in the heap 1293 void do_object(oop o); 1294}; 1295 1296void HeapObjectDumper::do_object(oop o) { 1297 // hide the sentinel for deleted handles 1298 if (o == JNIHandles::deleted_handle()) return; 1299 1300 // ignore KlassKlass objects 1301 if (o->is_klass()) return; 1302 1303 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records 1304 if (o->klass() == SystemDictionary::Class_klass()) { 1305 if (!java_lang_Class::is_primitive(o)) { 1306 return; 1307 } 1308 } 1309 1310 // create a HPROF_GC_INSTANCE record for each object 1311 if (o->is_instance()) { 1312 DumperSupport::dump_instance(writer(), o); 1313 mark_end_of_record(); 1314 } else { 1315 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array 1316 if (o->is_objArray()) { 1317 DumperSupport::dump_object_array(writer(), objArrayOop(o)); 1318 mark_end_of_record(); 1319 } else { 1320 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array 1321 if (o->is_typeArray()) { 1322 DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); 1323 mark_end_of_record(); 1324 } 1325 } 1326 } 1327} 1328 1329// The VM operation that performs the heap dump 1330class VM_HeapDumper : public VM_GC_Operation { 1331 private: 1332 static VM_HeapDumper* _global_dumper; 1333 static DumpWriter* _global_writer; 1334 DumpWriter* _local_writer; 1335 JavaThread* _oome_thread; 1336 methodOop _oome_constructor; 1337 bool _gc_before_heap_dump; 1338 bool _is_segmented_dump; 1339 jlong _dump_start; 1340 GrowableArray<Klass*>* _klass_map; 1341 ThreadStackTrace** _stack_traces; 1342 int _num_threads; 1343 1344 // accessors and setters 1345 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } 1346 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } 1347 void set_global_dumper() { 1348 assert(_global_dumper == NULL, "Error"); 1349 _global_dumper = this; 1350 } 1351 void set_global_writer() { 1352 assert(_global_writer == NULL, "Error"); 1353 _global_writer = _local_writer; 1354 } 1355 void clear_global_dumper() { _global_dumper = NULL; } 1356 void clear_global_writer() { _global_writer = NULL; } 1357 1358 bool is_segmented_dump() const { return _is_segmented_dump; } 1359 void set_segmented_dump() { _is_segmented_dump = true; } 1360 jlong dump_start() const { return _dump_start; } 1361 void set_dump_start(jlong pos); 1362 1363 bool skip_operation() const; 1364 1365 // writes a HPROF_LOAD_CLASS record 1366 static void do_load_class(klassOop k); 1367 1368 // writes a HPROF_GC_CLASS_DUMP record for the given class 1369 // (and each array class too) 1370 static void do_class_dump(klassOop k); 1371 1372 // writes a HPROF_GC_CLASS_DUMP records for a given basic type 1373 // array (and each multi-dimensional array too) 1374 static void do_basic_type_array_class_dump(klassOop k); 1375 1376 // HPROF_GC_ROOT_THREAD_OBJ records 1377 int do_thread(JavaThread* thread, u4 thread_serial_num); 1378 void do_threads(); 1379 1380 void add_class_serial_number(Klass* k, int serial_num) { 1381 _klass_map->at_put_grow(serial_num, k); 1382 } 1383 1384 // HPROF_TRACE and HPROF_FRAME records 1385 void dump_stack_traces(); 1386 1387 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1388 void write_dump_header(); 1389 1390 // fixes up the length of the current dump record 1391 void write_current_dump_record_length(); 1392 1393 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1394 // record in the case of a segmented heap dump) 1395 void end_of_dump(); 1396 1397 public: 1398 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : 1399 VM_GC_Operation(0 /* total collections, dummy, ignored */, 1400 0 /* total full collections, dummy, ignored */, 1401 gc_before_heap_dump) { 1402 _local_writer = writer; 1403 _gc_before_heap_dump = gc_before_heap_dump; 1404 _is_segmented_dump = false; 1405 _dump_start = (jlong)-1; 1406 _klass_map = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); 1407 _stack_traces = NULL; 1408 _num_threads = 0; 1409 if (oome) { 1410 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); 1411 // get OutOfMemoryError zero-parameter constructor 1412 instanceKlass* oome_ik = instanceKlass::cast(SystemDictionary::OutOfMemoryError_klass()); 1413 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), 1414 vmSymbols::void_method_signature()); 1415 // get thread throwing OOME when generating the heap dump at OOME 1416 _oome_thread = JavaThread::current(); 1417 } else { 1418 _oome_thread = NULL; 1419 _oome_constructor = NULL; 1420 } 1421 } 1422 ~VM_HeapDumper() { 1423 if (_stack_traces != NULL) { 1424 for (int i=0; i < _num_threads; i++) { 1425 delete _stack_traces[i]; 1426 } 1427 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces); 1428 } 1429 delete _klass_map; 1430 } 1431 1432 VMOp_Type type() const { return VMOp_HeapDumper; } 1433 // used to mark sub-record boundary 1434 void check_segment_length(); 1435 void doit(); 1436}; 1437 1438VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; 1439DumpWriter* VM_HeapDumper::_global_writer = NULL; 1440 1441bool VM_HeapDumper::skip_operation() const { 1442 return false; 1443} 1444 1445// sets the dump starting position 1446void VM_HeapDumper::set_dump_start(jlong pos) { 1447 _dump_start = pos; 1448} 1449 1450 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record 1451void VM_HeapDumper::write_dump_header() { 1452 if (writer()->is_open()) { 1453 if (is_segmented_dump()) { 1454 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT); 1455 } else { 1456 writer()->write_u1(HPROF_HEAP_DUMP); 1457 } 1458 writer()->write_u4(0); // current ticks 1459 1460 // record the starting position for the dump (its length will be fixed up later) 1461 set_dump_start(writer()->current_offset()); 1462 writer()->write_u4(0); 1463 } 1464} 1465 1466// fixes up the length of the current dump record 1467void VM_HeapDumper::write_current_dump_record_length() { 1468 if (writer()->is_open()) { 1469 assert(dump_start() >= 0, "no dump start recorded"); 1470 1471 // calculate the size of the dump record 1472 jlong dump_end = writer()->current_offset(); 1473 jlong dump_len = (dump_end - dump_start() - 4); 1474 1475 // record length must fit in a u4 1476 if (dump_len > (jlong)(4L*(jlong)G)) { 1477 warning("record is too large"); 1478 } 1479 1480 // seek to the dump start and fix-up the length 1481 writer()->seek_to_offset(dump_start()); 1482 writer()->write_u4((u4)dump_len); 1483 1484 // adjust the total size written to keep the bytes written correct. 1485 writer()->adjust_bytes_written(-((long) sizeof(u4))); 1486 1487 // seek to dump end so we can continue 1488 writer()->seek_to_offset(dump_end); 1489 1490 // no current dump record 1491 set_dump_start((jlong)-1); 1492 } 1493} 1494 1495// used on a sub-record boundary to check if we need to start a 1496// new segment. 1497void VM_HeapDumper::check_segment_length() { 1498 if (writer()->is_open()) { 1499 if (is_segmented_dump()) { 1500 // don't use current_offset that would be too expensive on a per record basis 1501 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten(); 1502 assert(dump_end == writer()->current_offset(), "checking"); 1503 jlong dump_len = (dump_end - dump_start() - 4); 1504 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length"); 1505 1506 if (dump_len > (jlong)HeapDumpSegmentSize) { 1507 write_current_dump_record_length(); 1508 write_dump_header(); 1509 } 1510 } 1511 } 1512} 1513 1514// fixes up the current dump record )and writes HPROF_HEAP_DUMP_END 1515// record in the case of a segmented heap dump) 1516void VM_HeapDumper::end_of_dump() { 1517 if (writer()->is_open()) { 1518 write_current_dump_record_length(); 1519 1520 // for segmented dump we write the end record 1521 if (is_segmented_dump()) { 1522 writer()->write_u1(HPROF_HEAP_DUMP_END); 1523 writer()->write_u4(0); 1524 writer()->write_u4(0); 1525 } 1526 } 1527} 1528 1529// marks sub-record boundary 1530void HeapObjectDumper::mark_end_of_record() { 1531 dumper()->check_segment_length(); 1532} 1533 1534// writes a HPROF_LOAD_CLASS record for the class (and each of its 1535// array classes) 1536void VM_HeapDumper::do_load_class(klassOop k) { 1537 static u4 class_serial_num = 0; 1538 1539 // len of HPROF_LOAD_CLASS record 1540 u4 remaining = 2*oopSize + 2*sizeof(u4); 1541 1542 // write a HPROF_LOAD_CLASS for the class and each array class 1543 do { 1544 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); 1545 1546 // class serial number is just a number 1547 writer()->write_u4(++class_serial_num); 1548 1549 // class ID 1550 Klass* klass = Klass::cast(k); 1551 writer()->write_classID(klass); 1552 1553 // add the klassOop and class serial number pair 1554 dumper()->add_class_serial_number(klass, class_serial_num); 1555 1556 writer()->write_u4(STACK_TRACE_ID); 1557 1558 // class name ID 1559 Symbol* name = klass->name(); 1560 writer()->write_symbolID(name); 1561 1562 // write a LOAD_CLASS record for the array type (if it exists) 1563 k = klass->array_klass_or_null(); 1564 } while (k != NULL); 1565} 1566 1567// writes a HPROF_GC_CLASS_DUMP record for the given class 1568void VM_HeapDumper::do_class_dump(klassOop k) { 1569 DumperSupport::dump_class_and_array_classes(writer(), k); 1570} 1571 1572// writes a HPROF_GC_CLASS_DUMP records for a given basic type 1573// array (and each multi-dimensional array too) 1574void VM_HeapDumper::do_basic_type_array_class_dump(klassOop k) { 1575 DumperSupport::dump_basic_type_array_class(writer(), k); 1576} 1577 1578// Walk the stack of the given thread. 1579// Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local 1580// Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local 1581// 1582// It returns the number of Java frames in this thread stack 1583int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { 1584 JNILocalsDumper blk(writer(), thread_serial_num); 1585 1586 oop threadObj = java_thread->threadObj(); 1587 assert(threadObj != NULL, "sanity check"); 1588 1589 int stack_depth = 0; 1590 if (java_thread->has_last_Java_frame()) { 1591 1592 // vframes are resource allocated 1593 Thread* current_thread = Thread::current(); 1594 ResourceMark rm(current_thread); 1595 HandleMark hm(current_thread); 1596 1597 RegisterMap reg_map(java_thread); 1598 frame f = java_thread->last_frame(); 1599 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); 1600 frame* last_entry_frame = NULL; 1601 int extra_frames = 0; 1602 1603 if (java_thread == _oome_thread && _oome_constructor != NULL) { 1604 extra_frames++; 1605 } 1606 while (vf != NULL) { 1607 blk.set_frame_number(stack_depth); 1608 if (vf->is_java_frame()) { 1609 1610 // java frame (interpreted, compiled, ...) 1611 javaVFrame *jvf = javaVFrame::cast(vf); 1612 if (!(jvf->method()->is_native())) { 1613 StackValueCollection* locals = jvf->locals(); 1614 for (int slot=0; slot<locals->size(); slot++) { 1615 if (locals->at(slot)->type() == T_OBJECT) { 1616 oop o = locals->obj_at(slot)(); 1617 1618 if (o != NULL) { 1619 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); 1620 writer()->write_objectID(o); 1621 writer()->write_u4(thread_serial_num); 1622 writer()->write_u4((u4) (stack_depth + extra_frames)); 1623 } 1624 } 1625 } 1626 } else { 1627 // native frame 1628 if (stack_depth == 0) { 1629 // JNI locals for the top frame. 1630 java_thread->active_handles()->oops_do(&blk); 1631 } else { 1632 if (last_entry_frame != NULL) { 1633 // JNI locals for the entry frame 1634 assert(last_entry_frame->is_entry_frame(), "checking"); 1635 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); 1636 } 1637 } 1638 } 1639 // increment only for Java frames 1640 stack_depth++; 1641 last_entry_frame = NULL; 1642 1643 } else { 1644 // externalVFrame - if it's an entry frame then report any JNI locals 1645 // as roots when we find the corresponding native javaVFrame 1646 frame* fr = vf->frame_pointer(); 1647 assert(fr != NULL, "sanity check"); 1648 if (fr->is_entry_frame()) { 1649 last_entry_frame = fr; 1650 } 1651 } 1652 vf = vf->sender(); 1653 } 1654 } else { 1655 // no last java frame but there may be JNI locals 1656 java_thread->active_handles()->oops_do(&blk); 1657 } 1658 return stack_depth; 1659} 1660 1661 1662// write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk 1663// the stack so that locals and JNI locals are dumped. 1664void VM_HeapDumper::do_threads() { 1665 for (int i=0; i < _num_threads; i++) { 1666 JavaThread* thread = _stack_traces[i]->thread(); 1667 oop threadObj = thread->threadObj(); 1668 u4 thread_serial_num = i+1; 1669 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; 1670 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); 1671 writer()->write_objectID(threadObj); 1672 writer()->write_u4(thread_serial_num); // thread number 1673 writer()->write_u4(stack_serial_num); // stack trace serial number 1674 int num_frames = do_thread(thread, thread_serial_num); 1675 assert(num_frames == _stack_traces[i]->get_stack_depth(), 1676 "total number of Java frames not matched"); 1677 } 1678} 1679 1680 1681// The VM operation that dumps the heap. The dump consists of the following 1682// records: 1683// 1684// HPROF_HEADER 1685// [HPROF_UTF8]* 1686// [HPROF_LOAD_CLASS]* 1687// [[HPROF_FRAME]*|HPROF_TRACE]* 1688// [HPROF_GC_CLASS_DUMP]* 1689// HPROF_HEAP_DUMP 1690// 1691// The HPROF_TRACE records represent the stack traces where the heap dump 1692// is generated and a "dummy trace" record which does not include 1693// any frames. The dummy trace record is used to be referenced as the 1694// unknown object alloc site. 1695// 1696// The HPROF_HEAP_DUMP record has a length following by sub-records. To allow 1697// the heap dump be generated in a single pass we remember the position of 1698// the dump length and fix it up after all sub-records have been written. 1699// To generate the sub-records we iterate over the heap, writing 1700// HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP 1701// records as we go. Once that is done we write records for some of the GC 1702// roots. 1703 1704void VM_HeapDumper::doit() { 1705 1706 HandleMark hm; 1707 CollectedHeap* ch = Universe::heap(); 1708 if (_gc_before_heap_dump) { 1709 ch->collect_as_vm_thread(GCCause::_heap_dump); 1710 } else { 1711 // make the heap parsable (no need to retire TLABs) 1712 ch->ensure_parsability(false); 1713 } 1714 1715 // At this point we should be the only dumper active, so 1716 // the following should be safe. 1717 set_global_dumper(); 1718 set_global_writer(); 1719 1720 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1 1721 size_t used = ch->used(); 1722 const char* header; 1723 if (used > (size_t)SegmentedHeapDumpThreshold) { 1724 set_segmented_dump(); 1725 header = "JAVA PROFILE 1.0.2"; 1726 } else { 1727 header = "JAVA PROFILE 1.0.1"; 1728 } 1729 1730 // header is few bytes long - no chance to overflow int 1731 writer()->write_raw((void*)header, (int)strlen(header)); 1732 writer()->write_u1(0); // terminator 1733 writer()->write_u4(oopSize); 1734 writer()->write_u8(os::javaTimeMillis()); 1735 1736 // HPROF_UTF8 records 1737 SymbolTableDumper sym_dumper(writer()); 1738 SymbolTable::symbols_do(&sym_dumper); 1739 1740 // write HPROF_LOAD_CLASS records 1741 SystemDictionary::classes_do(&do_load_class); 1742 Universe::basic_type_classes_do(&do_load_class); 1743 1744 // write HPROF_FRAME and HPROF_TRACE records 1745 // this must be called after _klass_map is built when iterating the classes above. 1746 dump_stack_traces(); 1747 1748 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT 1749 write_dump_header(); 1750 1751 // Writes HPROF_GC_CLASS_DUMP records 1752 SystemDictionary::classes_do(&do_class_dump); 1753 Universe::basic_type_classes_do(&do_basic_type_array_class_dump); 1754 check_segment_length(); 1755 1756 // writes HPROF_GC_INSTANCE_DUMP records. 1757 // After each sub-record is written check_segment_length will be invoked. When 1758 // generated a segmented heap dump this allows us to check if the current 1759 // segment exceeds a threshold and if so, then a new segment is started. 1760 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk 1761 // of the heap dump. 1762 HeapObjectDumper obj_dumper(this, writer()); 1763 Universe::heap()->safe_object_iterate(&obj_dumper); 1764 1765 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals 1766 do_threads(); 1767 check_segment_length(); 1768 1769 // HPROF_GC_ROOT_MONITOR_USED 1770 MonitorUsedDumper mon_dumper(writer()); 1771 ObjectSynchronizer::oops_do(&mon_dumper); 1772 check_segment_length(); 1773 1774 // HPROF_GC_ROOT_JNI_GLOBAL 1775 JNIGlobalsDumper jni_dumper(writer()); 1776 JNIHandles::oops_do(&jni_dumper); 1777 check_segment_length(); 1778 1779 // HPROF_GC_ROOT_STICKY_CLASS 1780 StickyClassDumper class_dumper(writer()); 1781 SystemDictionary::always_strong_oops_do(&class_dumper); 1782 1783 // fixes up the length of the dump record. In the case of a segmented 1784 // heap then the HPROF_HEAP_DUMP_END record is also written. 1785 end_of_dump(); 1786 1787 // Now we clear the global variables, so that a future dumper might run. 1788 clear_global_dumper(); 1789 clear_global_writer(); 1790} 1791 1792void VM_HeapDumper::dump_stack_traces() { 1793 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites 1794 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); 1795 writer()->write_u4((u4) STACK_TRACE_ID); 1796 writer()->write_u4(0); // thread number 1797 writer()->write_u4(0); // frame count 1798 1799 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads()); 1800 int frame_serial_num = 0; 1801 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { 1802 oop threadObj = thread->threadObj(); 1803 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { 1804 // dump thread stack trace 1805 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); 1806 stack_trace->dump_stack_at_safepoint(-1); 1807 _stack_traces[_num_threads++] = stack_trace; 1808 1809 // write HPROF_FRAME records for this thread's stack trace 1810 int depth = stack_trace->get_stack_depth(); 1811 int thread_frame_start = frame_serial_num; 1812 int extra_frames = 0; 1813 // write fake frame that makes it look like the thread, which caused OOME, 1814 // is in the OutOfMemoryError zero-parameter constructor 1815 if (thread == _oome_thread && _oome_constructor != NULL) { 1816 int oome_serial_num = _klass_map->find(Klass::cast(_oome_constructor->method_holder())); 1817 // the class serial number starts from 1 1818 assert(oome_serial_num > 0, "OutOfMemoryError class not found"); 1819 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, 1820 _oome_constructor, 0); 1821 extra_frames++; 1822 } 1823 for (int j=0; j < depth; j++) { 1824 StackFrameInfo* frame = stack_trace->stack_frame_at(j); 1825 methodOop m = frame->method(); 1826 int class_serial_num = _klass_map->find(Klass::cast(m->method_holder())); 1827 // the class serial number starts from 1 1828 assert(class_serial_num > 0, "class not found"); 1829 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); 1830 } 1831 depth += extra_frames; 1832 1833 // write HPROF_TRACE record for one thread 1834 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); 1835 int stack_serial_num = _num_threads + STACK_TRACE_ID; 1836 writer()->write_u4(stack_serial_num); // stack trace serial number 1837 writer()->write_u4((u4) _num_threads); // thread serial number 1838 writer()->write_u4(depth); // frame count 1839 for (int j=1; j <= depth; j++) { 1840 writer()->write_id(thread_frame_start + j); 1841 } 1842 } 1843 } 1844} 1845 1846// dump the heap to given path. 1847int HeapDumper::dump(const char* path) { 1848 assert(path != NULL && strlen(path) > 0, "path missing"); 1849 1850 // print message in interactive case 1851 if (print_to_tty()) { 1852 tty->print_cr("Dumping heap to %s ...", path); 1853 timer()->start(); 1854 } 1855 1856 // create the dump writer. If the file can be opened then bail 1857 DumpWriter writer(path); 1858 if (!writer.is_open()) { 1859 set_error(writer.error()); 1860 if (print_to_tty()) { 1861 tty->print_cr("Unable to create %s: %s", path, 1862 (error() != NULL) ? error() : "reason unknown"); 1863 } 1864 return -1; 1865 } 1866 1867 // generate the dump 1868 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); 1869 if (Thread::current()->is_VM_thread()) { 1870 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); 1871 dumper.doit(); 1872 } else { 1873 VMThread::execute(&dumper); 1874 } 1875 1876 // close dump file and record any error that the writer may have encountered 1877 writer.close(); 1878 set_error(writer.error()); 1879 1880 // print message in interactive case 1881 if (print_to_tty()) { 1882 timer()->stop(); 1883 if (error() == NULL) { 1884 char msg[256]; 1885 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]", 1886 os::jlong_format_specifier(), timer()->seconds()); 1887 tty->print_cr(msg, writer.bytes_written()); 1888 } else { 1889 tty->print_cr("Dump file is incomplete: %s", writer.error()); 1890 } 1891 } 1892 1893 return (writer.error() == NULL) ? 0 : -1; 1894} 1895 1896// stop timer (if still active), and free any error string we might be holding 1897HeapDumper::~HeapDumper() { 1898 if (timer()->is_active()) { 1899 timer()->stop(); 1900 } 1901 set_error(NULL); 1902} 1903 1904 1905// returns the error string (resource allocated), or NULL 1906char* HeapDumper::error_as_C_string() const { 1907 if (error() != NULL) { 1908 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); 1909 strcpy(str, error()); 1910 return str; 1911 } else { 1912 return NULL; 1913 } 1914} 1915 1916// set the error string 1917void HeapDumper::set_error(char* error) { 1918 if (_error != NULL) { 1919 os::free(_error); 1920 } 1921 if (error == NULL) { 1922 _error = NULL; 1923 } else { 1924 _error = os::strdup(error); 1925 assert(_error != NULL, "allocation failure"); 1926 } 1927} 1928 1929// Called by out-of-memory error reporting by a single Java thread 1930// outside of a JVM safepoint 1931void HeapDumper::dump_heap_from_oome() { 1932 HeapDumper::dump_heap(true); 1933} 1934 1935// Called by error reporting by a single Java thread outside of a JVM safepoint, 1936// or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various 1937// callers are strictly serialized and guaranteed not to interfere below. For more 1938// general use, however, this method will need modification to prevent 1939// inteference when updating the static variables base_path and dump_file_seq below. 1940void HeapDumper::dump_heap() { 1941 HeapDumper::dump_heap(false); 1942} 1943 1944void HeapDumper::dump_heap(bool oome) { 1945 static char base_path[JVM_MAXPATHLEN] = {'\0'}; 1946 static uint dump_file_seq = 0; 1947 char* my_path; 1948 const int max_digit_chars = 20; 1949 1950 const char* dump_file_name = "java_pid"; 1951 const char* dump_file_ext = ".hprof"; 1952 1953 // The dump file defaults to java_pid<pid>.hprof in the current working 1954 // directory. HeapDumpPath=<file> can be used to specify an alternative 1955 // dump file name or a directory where dump file is created. 1956 if (dump_file_seq == 0) { // first time in, we initialize base_path 1957 // Calculate potentially longest base path and check if we have enough 1958 // allocated statically. 1959 const size_t total_length = 1960 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + 1961 strlen(os::file_separator()) + max_digit_chars + 1962 strlen(dump_file_name) + strlen(dump_file_ext) + 1; 1963 if (total_length > sizeof(base_path)) { 1964 warning("Cannot create heap dump file. HeapDumpPath is too long."); 1965 return; 1966 } 1967 1968 bool use_default_filename = true; 1969 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { 1970 // HeapDumpPath=<file> not specified 1971 } else { 1972 strncpy(base_path, HeapDumpPath, sizeof(base_path)); 1973 // check if the path is a directory (must exist) 1974 DIR* dir = os::opendir(base_path); 1975 if (dir == NULL) { 1976 use_default_filename = false; 1977 } else { 1978 // HeapDumpPath specified a directory. We append a file separator 1979 // (if needed). 1980 os::closedir(dir); 1981 size_t fs_len = strlen(os::file_separator()); 1982 if (strlen(base_path) >= fs_len) { 1983 char* end = base_path; 1984 end += (strlen(base_path) - fs_len); 1985 if (strcmp(end, os::file_separator()) != 0) { 1986 strcat(base_path, os::file_separator()); 1987 } 1988 } 1989 } 1990 } 1991 // If HeapDumpPath wasn't a file name then we append the default name 1992 if (use_default_filename) { 1993 const size_t dlen = strlen(base_path); // if heap dump dir specified 1994 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", 1995 dump_file_name, os::current_process_id(), dump_file_ext); 1996 } 1997 const size_t len = strlen(base_path) + 1; 1998 my_path = (char*)os::malloc(len); 1999 if (my_path == NULL) { 2000 warning("Cannot create heap dump file. Out of system memory."); 2001 return; 2002 } 2003 strncpy(my_path, base_path, len); 2004 } else { 2005 // Append a sequence number id for dumps following the first 2006 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 2007 my_path = (char*)os::malloc(len); 2008 if (my_path == NULL) { 2009 warning("Cannot create heap dump file. Out of system memory."); 2010 return; 2011 } 2012 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); 2013 } 2014 dump_file_seq++; // increment seq number for next time we dump 2015 2016 HeapDumper dumper(false /* no GC before heap dump */, 2017 true /* send to tty */, 2018 oome /* pass along out-of-memory-error flag */); 2019 dumper.dump(my_path); 2020 os::free(my_path); 2021} 2022