Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/services/heapDumper.cpp@2ceafe3ceb65
src/share/vm/services/heapDumper.cpp
Wed, 16 Nov 2011 16:27:29 -0800
- author
- poonam
- date
- Wed, 16 Nov 2011 16:27:29 -0800
- changeset 3272
- 2ceafe3ceb65
- parent 2895
- 167b70ff3abc
- child 3900
- d2a62e0f25eb
- permissions
- -rw-r--r--
7110428: Crash during HeapDump operation
Reviewed-by: ysr, dholmes
1 /*
2 * Copyright (c) 2005, 2011, 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 */
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 #ifndef SERIALGC
44 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
45 #endif
47 /*
48 * HPROF binary format - description copied from:
49 * src/share/demo/jvmti/hprof/hprof_io.c
50 *
51 *
52 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2"
53 * (0-terminated)
54 *
55 * u4 size of identifiers. Identifiers are used to represent
56 * UTF8 strings, objects, stack traces, etc. They usually
57 * have the same size as host pointers. For example, on
58 * Solaris and Win32, the size is 4.
59 * u4 high word
60 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70
61 * [record]* a sequence of records.
62 *
63 *
64 * Record format:
65 *
66 * u1 a TAG denoting the type of the record
67 * u4 number of *microseconds* since the time stamp in the
68 * header. (wraps around in a little more than an hour)
69 * u4 number of bytes *remaining* in the record. Note that
70 * this number excludes the tag and the length field itself.
71 * [u1]* BODY of the record (a sequence of bytes)
72 *
73 *
74 * The following TAGs are supported:
75 *
76 * TAG BODY notes
77 *----------------------------------------------------------
78 * HPROF_UTF8 a UTF8-encoded name
79 *
80 * id name ID
81 * [u1]* UTF8 characters (no trailing zero)
82 *
83 * HPROF_LOAD_CLASS a newly loaded class
84 *
85 * u4 class serial number (> 0)
86 * id class object ID
87 * u4 stack trace serial number
88 * id class name ID
89 *
90 * HPROF_UNLOAD_CLASS an unloading class
91 *
92 * u4 class serial_number
93 *
94 * HPROF_FRAME a Java stack frame
95 *
96 * id stack frame ID
97 * id method name ID
98 * id method signature ID
99 * id source file name ID
100 * u4 class serial number
101 * i4 line number. >0: normal
102 * -1: unknown
103 * -2: compiled method
104 * -3: native method
105 *
106 * HPROF_TRACE a Java stack trace
107 *
108 * u4 stack trace serial number
109 * u4 thread serial number
110 * u4 number of frames
111 * [id]* stack frame IDs
112 *
113 *
114 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC
115 *
116 * u2 flags 0x0001: incremental vs. complete
117 * 0x0002: sorted by allocation vs. live
118 * 0x0004: whether to force a GC
119 * u4 cutoff ratio
120 * u4 total live bytes
121 * u4 total live instances
122 * u8 total bytes allocated
123 * u8 total instances allocated
124 * u4 number of sites that follow
125 * [u1 is_array: 0: normal object
126 * 2: object array
127 * 4: boolean array
128 * 5: char array
129 * 6: float array
130 * 7: double array
131 * 8: byte array
132 * 9: short array
133 * 10: int array
134 * 11: long array
135 * u4 class serial number (may be zero during startup)
136 * u4 stack trace serial number
137 * u4 number of bytes alive
138 * u4 number of instances alive
139 * u4 number of bytes allocated
140 * u4]* number of instance allocated
141 *
142 * HPROF_START_THREAD a newly started thread.
143 *
144 * u4 thread serial number (> 0)
145 * id thread object ID
146 * u4 stack trace serial number
147 * id thread name ID
148 * id thread group name ID
149 * id thread group parent name ID
150 *
151 * HPROF_END_THREAD a terminating thread.
152 *
153 * u4 thread serial number
154 *
155 * HPROF_HEAP_SUMMARY heap summary
156 *
157 * u4 total live bytes
158 * u4 total live instances
159 * u8 total bytes allocated
160 * u8 total instances allocated
161 *
162 * HPROF_HEAP_DUMP denote a heap dump
163 *
164 * [heap dump sub-records]*
165 *
166 * There are four kinds of heap dump sub-records:
167 *
168 * u1 sub-record type
169 *
170 * HPROF_GC_ROOT_UNKNOWN unknown root
171 *
172 * id object ID
173 *
174 * HPROF_GC_ROOT_THREAD_OBJ thread object
175 *
176 * id thread object ID (may be 0 for a
177 * thread newly attached through JNI)
178 * u4 thread sequence number
179 * u4 stack trace sequence number
180 *
181 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root
182 *
183 * id object ID
184 * id JNI global ref ID
185 *
186 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref
187 *
188 * id object ID
189 * u4 thread serial number
190 * u4 frame # in stack trace (-1 for empty)
191 *
192 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame
193 *
194 * id object ID
195 * u4 thread serial number
196 * u4 frame # in stack trace (-1 for empty)
197 *
198 * HPROF_GC_ROOT_NATIVE_STACK Native stack
199 *
200 * id object ID
201 * u4 thread serial number
202 *
203 * HPROF_GC_ROOT_STICKY_CLASS System class
204 *
205 * id object ID
206 *
207 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block
208 *
209 * id object ID
210 * u4 thread serial number
211 *
212 * HPROF_GC_ROOT_MONITOR_USED Busy monitor
213 *
214 * id object ID
215 *
216 * HPROF_GC_CLASS_DUMP dump of a class object
217 *
218 * id class object ID
219 * u4 stack trace serial number
220 * id super class object ID
221 * id class loader object ID
222 * id signers object ID
223 * id protection domain object ID
224 * id reserved
225 * id reserved
226 *
227 * u4 instance size (in bytes)
228 *
229 * u2 size of constant pool
230 * [u2, constant pool index,
231 * ty, type
232 * 2: object
233 * 4: boolean
234 * 5: char
235 * 6: float
236 * 7: double
237 * 8: byte
238 * 9: short
239 * 10: int
240 * 11: long
241 * vl]* and value
242 *
243 * u2 number of static fields
244 * [id, static field name,
245 * ty, type,
246 * vl]* and value
247 *
248 * u2 number of inst. fields (not inc. super)
249 * [id, instance field name,
250 * ty]* type
251 *
252 * HPROF_GC_INSTANCE_DUMP dump of a normal object
253 *
254 * id object ID
255 * u4 stack trace serial number
256 * id class object ID
257 * u4 number of bytes that follow
258 * [vl]* instance field values (class, followed
259 * by super, super's super ...)
260 *
261 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array
262 *
263 * id array object ID
264 * u4 stack trace serial number
265 * u4 number of elements
266 * id array class ID
267 * [id]* elements
268 *
269 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array
270 *
271 * id array object ID
272 * u4 stack trace serial number
273 * u4 number of elements
274 * u1 element type
275 * 4: boolean array
276 * 5: char array
277 * 6: float array
278 * 7: double array
279 * 8: byte array
280 * 9: short array
281 * 10: int array
282 * 11: long array
283 * [u1]* elements
284 *
285 * HPROF_CPU_SAMPLES a set of sample traces of running threads
286 *
287 * u4 total number of samples
288 * u4 # of traces
289 * [u4 # of samples
290 * u4]* stack trace serial number
291 *
292 * HPROF_CONTROL_SETTINGS the settings of on/off switches
293 *
294 * u4 0x00000001: alloc traces on/off
295 * 0x00000002: cpu sampling on/off
296 * u2 stack trace depth
297 *
298 *
299 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally
300 * be generated as a sequence of heap dump segments. This sequence is
301 * terminated by an end record. The additional tags allowed by format
302 * "JAVA PROFILE 1.0.2" are:
303 *
304 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment
305 *
306 * [heap dump sub-records]*
307 * The same sub-record types allowed by HPROF_HEAP_DUMP
308 *
309 * HPROF_HEAP_DUMP_END denotes the end of a heap dump
310 *
311 */
314 // HPROF tags
316 typedef enum {
317 // top-level records
318 HPROF_UTF8 = 0x01,
319 HPROF_LOAD_CLASS = 0x02,
320 HPROF_UNLOAD_CLASS = 0x03,
321 HPROF_FRAME = 0x04,
322 HPROF_TRACE = 0x05,
323 HPROF_ALLOC_SITES = 0x06,
324 HPROF_HEAP_SUMMARY = 0x07,
325 HPROF_START_THREAD = 0x0A,
326 HPROF_END_THREAD = 0x0B,
327 HPROF_HEAP_DUMP = 0x0C,
328 HPROF_CPU_SAMPLES = 0x0D,
329 HPROF_CONTROL_SETTINGS = 0x0E,
331 // 1.0.2 record types
332 HPROF_HEAP_DUMP_SEGMENT = 0x1C,
333 HPROF_HEAP_DUMP_END = 0x2C,
335 // field types
336 HPROF_ARRAY_OBJECT = 0x01,
337 HPROF_NORMAL_OBJECT = 0x02,
338 HPROF_BOOLEAN = 0x04,
339 HPROF_CHAR = 0x05,
340 HPROF_FLOAT = 0x06,
341 HPROF_DOUBLE = 0x07,
342 HPROF_BYTE = 0x08,
343 HPROF_SHORT = 0x09,
344 HPROF_INT = 0x0A,
345 HPROF_LONG = 0x0B,
347 // data-dump sub-records
348 HPROF_GC_ROOT_UNKNOWN = 0xFF,
349 HPROF_GC_ROOT_JNI_GLOBAL = 0x01,
350 HPROF_GC_ROOT_JNI_LOCAL = 0x02,
351 HPROF_GC_ROOT_JAVA_FRAME = 0x03,
352 HPROF_GC_ROOT_NATIVE_STACK = 0x04,
353 HPROF_GC_ROOT_STICKY_CLASS = 0x05,
354 HPROF_GC_ROOT_THREAD_BLOCK = 0x06,
355 HPROF_GC_ROOT_MONITOR_USED = 0x07,
356 HPROF_GC_ROOT_THREAD_OBJ = 0x08,
357 HPROF_GC_CLASS_DUMP = 0x20,
358 HPROF_GC_INSTANCE_DUMP = 0x21,
359 HPROF_GC_OBJ_ARRAY_DUMP = 0x22,
360 HPROF_GC_PRIM_ARRAY_DUMP = 0x23
361 } hprofTag;
363 // Default stack trace ID (used for dummy HPROF_TRACE record)
364 enum {
365 STACK_TRACE_ID = 1,
366 INITIAL_CLASS_COUNT = 200
367 };
369 // Supports I/O operations on a dump file
371 class DumpWriter : public StackObj {
372 private:
373 enum {
374 io_buffer_size = 8*M
375 };
377 int _fd; // file descriptor (-1 if dump file not open)
378 jlong _bytes_written; // number of byte written to dump file
380 char* _buffer; // internal buffer
381 int _size;
382 int _pos;
384 char* _error; // error message when I/O fails
386 void set_file_descriptor(int fd) { _fd = fd; }
387 int file_descriptor() const { return _fd; }
389 char* buffer() const { return _buffer; }
390 int buffer_size() const { return _size; }
391 int position() const { return _pos; }
392 void set_position(int pos) { _pos = pos; }
394 void set_error(const char* error) { _error = (char*)os::strdup(error); }
396 // all I/O go through this function
397 void write_internal(void* s, int len);
399 public:
400 DumpWriter(const char* path);
401 ~DumpWriter();
403 void close();
404 bool is_open() const { return file_descriptor() >= 0; }
405 void flush();
407 // total number of bytes written to the disk
408 jlong bytes_written() const { return _bytes_written; }
410 // adjust the number of bytes written to disk (used to keep the count
411 // of the number of bytes written in case of rewrites)
412 void adjust_bytes_written(jlong n) { _bytes_written += n; }
414 // number of (buffered) bytes as yet unwritten to the dump file
415 jlong bytes_unwritten() const { return (jlong)position(); }
417 char* error() const { return _error; }
419 jlong current_offset();
420 void seek_to_offset(jlong pos);
422 // writer functions
423 void write_raw(void* s, int len);
424 void write_u1(u1 x) { write_raw((void*)&x, 1); }
425 void write_u2(u2 x);
426 void write_u4(u4 x);
427 void write_u8(u8 x);
428 void write_objectID(oop o);
429 void write_symbolID(Symbol* o);
430 void write_classID(Klass* k);
431 void write_id(u4 x);
432 };
434 DumpWriter::DumpWriter(const char* path) {
435 // try to allocate an I/O buffer of io_buffer_size. If there isn't
436 // sufficient memory then reduce size until we can allocate something.
437 _size = io_buffer_size;
438 do {
439 _buffer = (char*)os::malloc(_size);
440 if (_buffer == NULL) {
441 _size = _size >> 1;
442 }
443 } while (_buffer == NULL && _size > 0);
444 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check");
445 _pos = 0;
446 _error = NULL;
447 _bytes_written = 0L;
448 _fd = os::create_binary_file(path, false); // don't replace existing file
450 // if the open failed we record the error
451 if (_fd < 0) {
452 _error = (char*)os::strdup(strerror(errno));
453 }
454 }
456 DumpWriter::~DumpWriter() {
457 // flush and close dump file
458 if (is_open()) {
459 close();
460 }
461 if (_buffer != NULL) os::free(_buffer);
462 if (_error != NULL) os::free(_error);
463 }
465 // closes dump file (if open)
466 void DumpWriter::close() {
467 // flush and close dump file
468 if (is_open()) {
469 flush();
470 ::close(file_descriptor());
471 set_file_descriptor(-1);
472 }
473 }
475 // write directly to the file
476 void DumpWriter::write_internal(void* s, int len) {
477 if (is_open()) {
478 int n = ::write(file_descriptor(), s, len);
479 if (n > 0) {
480 _bytes_written += n;
481 }
482 if (n != len) {
483 if (n < 0) {
484 set_error(strerror(errno));
485 } else {
486 set_error("file size limit");
487 }
488 ::close(file_descriptor());
489 set_file_descriptor(-1);
490 }
491 }
492 }
494 // write raw bytes
495 void DumpWriter::write_raw(void* s, int len) {
496 if (is_open()) {
497 // flush buffer to make toom
498 if ((position()+ len) >= buffer_size()) {
499 flush();
500 }
502 // buffer not available or too big to buffer it
503 if ((buffer() == NULL) || (len >= buffer_size())) {
504 write_internal(s, len);
505 } else {
506 // Should optimize this for u1/u2/u4/u8 sizes.
507 memcpy(buffer() + position(), s, len);
508 set_position(position() + len);
509 }
510 }
511 }
513 // flush any buffered bytes to the file
514 void DumpWriter::flush() {
515 if (is_open() && position() > 0) {
516 write_internal(buffer(), position());
517 set_position(0);
518 }
519 }
522 jlong DumpWriter::current_offset() {
523 if (is_open()) {
524 // the offset is the file offset plus whatever we have buffered
525 jlong offset = os::current_file_offset(file_descriptor());
526 assert(offset >= 0, "lseek failed");
527 return offset + (jlong)position();
528 } else {
529 return (jlong)-1;
530 }
531 }
533 void DumpWriter::seek_to_offset(jlong off) {
534 assert(off >= 0, "bad offset");
536 // need to flush before seeking
537 flush();
539 // may be closed due to I/O error
540 if (is_open()) {
541 jlong n = os::seek_to_file_offset(file_descriptor(), off);
542 assert(n >= 0, "lseek failed");
543 }
544 }
546 void DumpWriter::write_u2(u2 x) {
547 u2 v;
548 Bytes::put_Java_u2((address)&v, x);
549 write_raw((void*)&v, 2);
550 }
552 void DumpWriter::write_u4(u4 x) {
553 u4 v;
554 Bytes::put_Java_u4((address)&v, x);
555 write_raw((void*)&v, 4);
556 }
558 void DumpWriter::write_u8(u8 x) {
559 u8 v;
560 Bytes::put_Java_u8((address)&v, x);
561 write_raw((void*)&v, 8);
562 }
564 void DumpWriter::write_objectID(oop o) {
565 address a = (address)((uintptr_t)o);
566 #ifdef _LP64
567 write_u8((u8)a);
568 #else
569 write_u4((u4)a);
570 #endif
571 }
573 void DumpWriter::write_symbolID(Symbol* s) {
574 address a = (address)((uintptr_t)s);
575 #ifdef _LP64
576 write_u8((u8)a);
577 #else
578 write_u4((u4)a);
579 #endif
580 }
582 void DumpWriter::write_id(u4 x) {
583 #ifdef _LP64
584 write_u8((u8) x);
585 #else
586 write_u4(x);
587 #endif
588 }
590 // We use java mirror as the class ID
591 void DumpWriter::write_classID(Klass* k) {
592 write_objectID(k->java_mirror());
593 }
597 // Support class with a collection of functions used when dumping the heap
599 class DumperSupport : AllStatic {
600 public:
602 // write a header of the given type
603 static void write_header(DumpWriter* writer, hprofTag tag, u4 len);
605 // returns hprof tag for the given type signature
606 static hprofTag sig2tag(Symbol* sig);
607 // returns hprof tag for the given basic type
608 static hprofTag type2tag(BasicType type);
610 // returns the size of the instance of the given class
611 static u4 instance_size(klassOop k);
613 // dump a jfloat
614 static void dump_float(DumpWriter* writer, jfloat f);
615 // dump a jdouble
616 static void dump_double(DumpWriter* writer, jdouble d);
617 // dumps the raw value of the given field
618 static void dump_field_value(DumpWriter* writer, char type, address addr);
619 // dumps static fields of the given class
620 static void dump_static_fields(DumpWriter* writer, klassOop k);
621 // dump the raw values of the instance fields of the given object
622 static void dump_instance_fields(DumpWriter* writer, oop o);
623 // dumps the definition of the instance fields for a given class
624 static void dump_instance_field_descriptors(DumpWriter* writer, klassOop k);
625 // creates HPROF_GC_INSTANCE_DUMP record for the given object
626 static void dump_instance(DumpWriter* writer, oop o);
627 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its
628 // array classes
629 static void dump_class_and_array_classes(DumpWriter* writer, klassOop k);
630 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
631 // class (and each multi-dimensional array class too)
632 static void dump_basic_type_array_class(DumpWriter* writer, klassOop k);
634 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
635 static void dump_object_array(DumpWriter* writer, objArrayOop array);
636 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
637 static void dump_prim_array(DumpWriter* writer, typeArrayOop array);
638 // create HPROF_FRAME record for the given method and bci
639 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, methodOop m, int bci);
640 };
642 // write a header of the given type
643 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) {
644 writer->write_u1((u1)tag);
645 writer->write_u4(0); // current ticks
646 writer->write_u4(len);
647 }
649 // returns hprof tag for the given type signature
650 hprofTag DumperSupport::sig2tag(Symbol* sig) {
651 switch (sig->byte_at(0)) {
652 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT;
653 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT;
654 case JVM_SIGNATURE_BYTE : return HPROF_BYTE;
655 case JVM_SIGNATURE_CHAR : return HPROF_CHAR;
656 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT;
657 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE;
658 case JVM_SIGNATURE_INT : return HPROF_INT;
659 case JVM_SIGNATURE_LONG : return HPROF_LONG;
660 case JVM_SIGNATURE_SHORT : return HPROF_SHORT;
661 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN;
662 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
663 }
664 }
666 hprofTag DumperSupport::type2tag(BasicType type) {
667 switch (type) {
668 case T_BYTE : return HPROF_BYTE;
669 case T_CHAR : return HPROF_CHAR;
670 case T_FLOAT : return HPROF_FLOAT;
671 case T_DOUBLE : return HPROF_DOUBLE;
672 case T_INT : return HPROF_INT;
673 case T_LONG : return HPROF_LONG;
674 case T_SHORT : return HPROF_SHORT;
675 case T_BOOLEAN : return HPROF_BOOLEAN;
676 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
677 }
678 }
680 // dump a jfloat
681 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) {
682 if (g_isnan(f)) {
683 writer->write_u4(0x7fc00000); // collapsing NaNs
684 } else {
685 union {
686 int i;
687 float f;
688 } u;
689 u.f = (float)f;
690 writer->write_u4((u4)u.i);
691 }
692 }
694 // dump a jdouble
695 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) {
696 union {
697 jlong l;
698 double d;
699 } u;
700 if (g_isnan(d)) { // collapsing NaNs
701 u.l = (jlong)(0x7ff80000);
702 u.l = (u.l << 32);
703 } else {
704 u.d = (double)d;
705 }
706 writer->write_u8((u8)u.l);
707 }
709 // dumps the raw value of the given field
710 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) {
711 switch (type) {
712 case JVM_SIGNATURE_CLASS :
713 case JVM_SIGNATURE_ARRAY : {
714 oop o;
715 if (UseCompressedOops) {
716 o = oopDesc::load_decode_heap_oop((narrowOop*)addr);
717 } else {
718 o = oopDesc::load_decode_heap_oop((oop*)addr);
719 }
721 // reflection and sun.misc.Unsafe classes may have a reference to a
722 // klassOop so filter it out.
723 if (o != NULL && o->is_klass()) {
724 o = NULL;
725 }
727 // FIXME: When sharing is enabled we don't emit field references to objects
728 // in shared spaces. We can remove this once we write records for the classes
729 // and strings that are shared.
730 if (o != NULL && o->is_shared()) {
731 o = NULL;
732 }
733 writer->write_objectID(o);
734 break;
735 }
736 case JVM_SIGNATURE_BYTE : {
737 jbyte* b = (jbyte*)addr;
738 writer->write_u1((u1)*b);
739 break;
740 }
741 case JVM_SIGNATURE_CHAR : {
742 jchar* c = (jchar*)addr;
743 writer->write_u2((u2)*c);
744 break;
745 }
746 case JVM_SIGNATURE_SHORT : {
747 jshort* s = (jshort*)addr;
748 writer->write_u2((u2)*s);
749 break;
750 }
751 case JVM_SIGNATURE_FLOAT : {
752 jfloat* f = (jfloat*)addr;
753 dump_float(writer, *f);
754 break;
755 }
756 case JVM_SIGNATURE_DOUBLE : {
757 jdouble* f = (jdouble*)addr;
758 dump_double(writer, *f);
759 break;
760 }
761 case JVM_SIGNATURE_INT : {
762 jint* i = (jint*)addr;
763 writer->write_u4((u4)*i);
764 break;
765 }
766 case JVM_SIGNATURE_LONG : {
767 jlong* l = (jlong*)addr;
768 writer->write_u8((u8)*l);
769 break;
770 }
771 case JVM_SIGNATURE_BOOLEAN : {
772 jboolean* b = (jboolean*)addr;
773 writer->write_u1((u1)*b);
774 break;
775 }
776 default : ShouldNotReachHere();
777 }
778 }
780 // returns the size of the instance of the given class
781 u4 DumperSupport::instance_size(klassOop k) {
782 HandleMark hm;
783 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
785 int size = 0;
787 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
788 if (!fld.access_flags().is_static()) {
789 Symbol* sig = fld.signature();
790 switch (sig->byte_at(0)) {
791 case JVM_SIGNATURE_CLASS :
792 case JVM_SIGNATURE_ARRAY : size += oopSize; break;
794 case JVM_SIGNATURE_BYTE :
795 case JVM_SIGNATURE_BOOLEAN : size += 1; break;
797 case JVM_SIGNATURE_CHAR :
798 case JVM_SIGNATURE_SHORT : size += 2; break;
800 case JVM_SIGNATURE_INT :
801 case JVM_SIGNATURE_FLOAT : size += 4; break;
803 case JVM_SIGNATURE_LONG :
804 case JVM_SIGNATURE_DOUBLE : size += 8; break;
806 default : ShouldNotReachHere();
807 }
808 }
809 }
810 return (u4)size;
811 }
813 // dumps static fields of the given class
814 void DumperSupport::dump_static_fields(DumpWriter* writer, klassOop k) {
815 HandleMark hm;
816 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
818 // pass 1 - count the static fields
819 u2 field_count = 0;
820 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
821 if (fldc.access_flags().is_static()) field_count++;
822 }
824 writer->write_u2(field_count);
826 // pass 2 - dump the field descriptors and raw values
827 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) {
828 if (fld.access_flags().is_static()) {
829 Symbol* sig = fld.signature();
831 writer->write_symbolID(fld.name()); // name
832 writer->write_u1(sig2tag(sig)); // type
834 // value
835 int offset = fld.offset();
836 address addr = (address)ikh->java_mirror() + offset;
838 dump_field_value(writer, sig->byte_at(0), addr);
839 }
840 }
841 }
843 // dump the raw values of the instance fields of the given object
844 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) {
845 HandleMark hm;
846 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass());
848 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
849 if (!fld.access_flags().is_static()) {
850 Symbol* sig = fld.signature();
851 address addr = (address)o + fld.offset();
853 dump_field_value(writer, sig->byte_at(0), addr);
854 }
855 }
856 }
858 // dumps the definition of the instance fields for a given class
859 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, klassOop k) {
860 HandleMark hm;
861 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
863 // pass 1 - count the instance fields
864 u2 field_count = 0;
865 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
866 if (!fldc.access_flags().is_static()) field_count++;
867 }
869 writer->write_u2(field_count);
871 // pass 2 - dump the field descriptors
872 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) {
873 if (!fld.access_flags().is_static()) {
874 Symbol* sig = fld.signature();
876 writer->write_symbolID(fld.name()); // name
877 writer->write_u1(sig2tag(sig)); // type
878 }
879 }
880 }
882 // creates HPROF_GC_INSTANCE_DUMP record for the given object
883 void DumperSupport::dump_instance(DumpWriter* writer, oop o) {
884 klassOop k = o->klass();
886 writer->write_u1(HPROF_GC_INSTANCE_DUMP);
887 writer->write_objectID(o);
888 writer->write_u4(STACK_TRACE_ID);
890 // class ID
891 writer->write_classID(Klass::cast(k));
893 // number of bytes that follow
894 writer->write_u4(instance_size(k) );
896 // field values
897 dump_instance_fields(writer, o);
898 }
900 // creates HPROF_GC_CLASS_DUMP record for the given class and each of
901 // its array classes
902 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, klassOop k) {
903 Klass* klass = Klass::cast(k);
904 assert(klass->oop_is_instance(), "not an instanceKlass");
905 instanceKlass* ik = (instanceKlass*)klass;
907 writer->write_u1(HPROF_GC_CLASS_DUMP);
909 // class ID
910 writer->write_classID(ik);
911 writer->write_u4(STACK_TRACE_ID);
913 // super class ID
914 klassOop java_super = ik->java_super();
915 if (java_super == NULL) {
916 writer->write_objectID(NULL);
917 } else {
918 writer->write_classID(Klass::cast(java_super));
919 }
921 writer->write_objectID(ik->class_loader());
922 writer->write_objectID(ik->signers());
923 writer->write_objectID(ik->protection_domain());
925 // reserved
926 writer->write_objectID(NULL);
927 writer->write_objectID(NULL);
929 // instance size
930 writer->write_u4(DumperSupport::instance_size(k));
932 // size of constant pool - ignored by HAT 1.1
933 writer->write_u2(0);
935 // number of static fields
936 dump_static_fields(writer, k);
938 // description of instance fields
939 dump_instance_field_descriptors(writer, k);
941 // array classes
942 k = klass->array_klass_or_null();
943 while (k != NULL) {
944 Klass* klass = Klass::cast(k);
945 assert(klass->oop_is_objArray(), "not an objArrayKlass");
947 writer->write_u1(HPROF_GC_CLASS_DUMP);
948 writer->write_classID(klass);
949 writer->write_u4(STACK_TRACE_ID);
951 // super class of array classes is java.lang.Object
952 java_super = klass->java_super();
953 assert(java_super != NULL, "checking");
954 writer->write_classID(Klass::cast(java_super));
956 writer->write_objectID(ik->class_loader());
957 writer->write_objectID(ik->signers());
958 writer->write_objectID(ik->protection_domain());
960 writer->write_objectID(NULL); // reserved
961 writer->write_objectID(NULL);
962 writer->write_u4(0); // instance size
963 writer->write_u2(0); // constant pool
964 writer->write_u2(0); // static fields
965 writer->write_u2(0); // instance fields
967 // get the array class for the next rank
968 k = klass->array_klass_or_null();
969 }
970 }
972 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
973 // class (and each multi-dimensional array class too)
974 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, klassOop k) {
975 // array classes
976 while (k != NULL) {
977 Klass* klass = Klass::cast(k);
979 writer->write_u1(HPROF_GC_CLASS_DUMP);
980 writer->write_classID(klass);
981 writer->write_u4(STACK_TRACE_ID);
983 // super class of array classes is java.lang.Object
984 klassOop java_super = klass->java_super();
985 assert(java_super != NULL, "checking");
986 writer->write_classID(Klass::cast(java_super));
988 writer->write_objectID(NULL); // loader
989 writer->write_objectID(NULL); // signers
990 writer->write_objectID(NULL); // protection domain
992 writer->write_objectID(NULL); // reserved
993 writer->write_objectID(NULL);
994 writer->write_u4(0); // instance size
995 writer->write_u2(0); // constant pool
996 writer->write_u2(0); // static fields
997 writer->write_u2(0); // instance fields
999 // get the array class for the next rank
1000 k = klass->array_klass_or_null();
1001 }
1002 }
1004 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
1005 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) {
1007 // filter this
1008 if (array->klass() == Universe::systemObjArrayKlassObj()) return;
1010 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP);
1011 writer->write_objectID(array);
1012 writer->write_u4(STACK_TRACE_ID);
1013 writer->write_u4((u4)array->length());
1015 // array class ID
1016 writer->write_classID(Klass::cast(array->klass()));
1018 // [id]* elements
1019 for (int index=0; index<array->length(); index++) {
1020 oop o = array->obj_at(index);
1021 writer->write_objectID(o);
1022 }
1023 }
1025 #define WRITE_ARRAY(Array, Type, Size) \
1026 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); }
1029 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
1030 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) {
1031 BasicType type = typeArrayKlass::cast(array->klass())->element_type();
1033 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP);
1034 writer->write_objectID(array);
1035 writer->write_u4(STACK_TRACE_ID);
1036 writer->write_u4((u4)array->length());
1037 writer->write_u1(type2tag(type));
1039 // nothing to copy
1040 if (array->length() == 0) {
1041 return;
1042 }
1044 // If the byte ordering is big endian then we can copy most types directly
1045 int length_in_bytes = array->length() * type2aelembytes(type);
1046 assert(length_in_bytes > 0, "nothing to copy");
1048 switch (type) {
1049 case T_INT : {
1050 if (Bytes::is_Java_byte_ordering_different()) {
1051 WRITE_ARRAY(array, int, u4);
1052 } else {
1053 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes);
1054 }
1055 break;
1056 }
1057 case T_BYTE : {
1058 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes);
1059 break;
1060 }
1061 case T_CHAR : {
1062 if (Bytes::is_Java_byte_ordering_different()) {
1063 WRITE_ARRAY(array, char, u2);
1064 } else {
1065 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes);
1066 }
1067 break;
1068 }
1069 case T_SHORT : {
1070 if (Bytes::is_Java_byte_ordering_different()) {
1071 WRITE_ARRAY(array, short, u2);
1072 } else {
1073 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes);
1074 }
1075 break;
1076 }
1077 case T_BOOLEAN : {
1078 if (Bytes::is_Java_byte_ordering_different()) {
1079 WRITE_ARRAY(array, bool, u1);
1080 } else {
1081 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes);
1082 }
1083 break;
1084 }
1085 case T_LONG : {
1086 if (Bytes::is_Java_byte_ordering_different()) {
1087 WRITE_ARRAY(array, long, u8);
1088 } else {
1089 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes);
1090 }
1091 break;
1092 }
1094 // handle float/doubles in a special value to ensure than NaNs are
1095 // written correctly. TO DO: Check if we can avoid this on processors that
1096 // use IEEE 754.
1098 case T_FLOAT : {
1099 for (int i=0; i<array->length(); i++) {
1100 dump_float( writer, array->float_at(i) );
1101 }
1102 break;
1103 }
1104 case T_DOUBLE : {
1105 for (int i=0; i<array->length(); i++) {
1106 dump_double( writer, array->double_at(i) );
1107 }
1108 break;
1109 }
1110 default : ShouldNotReachHere();
1111 }
1112 }
1114 // create a HPROF_FRAME record of the given methodOop and bci
1115 void DumperSupport::dump_stack_frame(DumpWriter* writer,
1116 int frame_serial_num,
1117 int class_serial_num,
1118 methodOop m,
1119 int bci) {
1120 int line_number;
1121 if (m->is_native()) {
1122 line_number = -3; // native frame
1123 } else {
1124 line_number = m->line_number_from_bci(bci);
1125 }
1127 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4));
1128 writer->write_id(frame_serial_num); // frame serial number
1129 writer->write_symbolID(m->name()); // method's name
1130 writer->write_symbolID(m->signature()); // method's signature
1132 assert(Klass::cast(m->method_holder())->oop_is_instance(), "not instanceKlass");
1133 writer->write_symbolID(instanceKlass::cast(m->method_holder())->source_file_name()); // source file name
1134 writer->write_u4(class_serial_num); // class serial number
1135 writer->write_u4((u4) line_number); // line number
1136 }
1139 // Support class used to generate HPROF_UTF8 records from the entries in the
1140 // SymbolTable.
1142 class SymbolTableDumper : public SymbolClosure {
1143 private:
1144 DumpWriter* _writer;
1145 DumpWriter* writer() const { return _writer; }
1146 public:
1147 SymbolTableDumper(DumpWriter* writer) { _writer = writer; }
1148 void do_symbol(Symbol** p);
1149 };
1151 void SymbolTableDumper::do_symbol(Symbol** p) {
1152 ResourceMark rm;
1153 Symbol* sym = load_symbol(p);
1154 int len = sym->utf8_length();
1155 if (len > 0) {
1156 char* s = sym->as_utf8();
1157 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len);
1158 writer()->write_symbolID(sym);
1159 writer()->write_raw(s, len);
1160 }
1161 }
1163 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records
1165 class JNILocalsDumper : public OopClosure {
1166 private:
1167 DumpWriter* _writer;
1168 u4 _thread_serial_num;
1169 int _frame_num;
1170 DumpWriter* writer() const { return _writer; }
1171 public:
1172 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) {
1173 _writer = writer;
1174 _thread_serial_num = thread_serial_num;
1175 _frame_num = -1; // default - empty stack
1176 }
1177 void set_frame_number(int n) { _frame_num = n; }
1178 void do_oop(oop* obj_p);
1179 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1180 };
1183 void JNILocalsDumper::do_oop(oop* obj_p) {
1184 // ignore null or deleted handles
1185 oop o = *obj_p;
1186 if (o != NULL && o != JNIHandles::deleted_handle()) {
1187 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL);
1188 writer()->write_objectID(o);
1189 writer()->write_u4(_thread_serial_num);
1190 writer()->write_u4((u4)_frame_num);
1191 }
1192 }
1195 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records
1197 class JNIGlobalsDumper : public OopClosure {
1198 private:
1199 DumpWriter* _writer;
1200 DumpWriter* writer() const { return _writer; }
1202 public:
1203 JNIGlobalsDumper(DumpWriter* writer) {
1204 _writer = writer;
1205 }
1206 void do_oop(oop* obj_p);
1207 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1208 };
1210 void JNIGlobalsDumper::do_oop(oop* obj_p) {
1211 oop o = *obj_p;
1213 // ignore these
1214 if (o == NULL || o == JNIHandles::deleted_handle()) return;
1216 // we ignore global ref to symbols and other internal objects
1217 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) {
1218 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL);
1219 writer()->write_objectID(o);
1220 writer()->write_objectID((oopDesc*)obj_p); // global ref ID
1221 }
1222 };
1225 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records
1227 class MonitorUsedDumper : public OopClosure {
1228 private:
1229 DumpWriter* _writer;
1230 DumpWriter* writer() const { return _writer; }
1231 public:
1232 MonitorUsedDumper(DumpWriter* writer) {
1233 _writer = writer;
1234 }
1235 void do_oop(oop* obj_p) {
1236 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED);
1237 writer()->write_objectID(*obj_p);
1238 }
1239 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1240 };
1243 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records
1245 class StickyClassDumper : public OopClosure {
1246 private:
1247 DumpWriter* _writer;
1248 DumpWriter* writer() const { return _writer; }
1249 public:
1250 StickyClassDumper(DumpWriter* writer) {
1251 _writer = writer;
1252 }
1253 void do_oop(oop* obj_p);
1254 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1255 };
1257 void StickyClassDumper::do_oop(oop* obj_p) {
1258 if (*obj_p != NULL) {
1259 oop o = *obj_p;
1260 if (o->is_klass()) {
1261 klassOop k = klassOop(o);
1262 if (Klass::cast(k)->oop_is_instance()) {
1263 instanceKlass* ik = instanceKlass::cast(k);
1264 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS);
1265 writer()->write_classID(ik);
1266 }
1267 }
1268 }
1269 }
1272 class VM_HeapDumper;
1274 // Support class using when iterating over the heap.
1276 class HeapObjectDumper : public ObjectClosure {
1277 private:
1278 VM_HeapDumper* _dumper;
1279 DumpWriter* _writer;
1281 VM_HeapDumper* dumper() { return _dumper; }
1282 DumpWriter* writer() { return _writer; }
1284 // used to indicate that a record has been writen
1285 void mark_end_of_record();
1287 public:
1288 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) {
1289 _dumper = dumper;
1290 _writer = writer;
1291 }
1293 // called for each object in the heap
1294 void do_object(oop o);
1295 };
1297 void HeapObjectDumper::do_object(oop o) {
1298 // hide the sentinel for deleted handles
1299 if (o == JNIHandles::deleted_handle()) return;
1301 // ignore KlassKlass objects
1302 if (o->is_klass()) return;
1304 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records
1305 if (o->klass() == SystemDictionary::Class_klass()) {
1306 if (!java_lang_Class::is_primitive(o)) {
1307 return;
1308 }
1309 }
1311 // create a HPROF_GC_INSTANCE record for each object
1312 if (o->is_instance()) {
1313 DumperSupport::dump_instance(writer(), o);
1314 mark_end_of_record();
1315 } else {
1316 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array
1317 if (o->is_objArray()) {
1318 DumperSupport::dump_object_array(writer(), objArrayOop(o));
1319 mark_end_of_record();
1320 } else {
1321 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array
1322 if (o->is_typeArray()) {
1323 DumperSupport::dump_prim_array(writer(), typeArrayOop(o));
1324 mark_end_of_record();
1325 }
1326 }
1327 }
1328 }
1330 // The VM operation that performs the heap dump
1331 class VM_HeapDumper : public VM_GC_Operation {
1332 private:
1333 static VM_HeapDumper* _global_dumper;
1334 static DumpWriter* _global_writer;
1335 DumpWriter* _local_writer;
1336 JavaThread* _oome_thread;
1337 methodOop _oome_constructor;
1338 bool _gc_before_heap_dump;
1339 bool _is_segmented_dump;
1340 jlong _dump_start;
1341 GrowableArray<Klass*>* _klass_map;
1342 ThreadStackTrace** _stack_traces;
1343 int _num_threads;
1345 // accessors and setters
1346 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; }
1347 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; }
1348 void set_global_dumper() {
1349 assert(_global_dumper == NULL, "Error");
1350 _global_dumper = this;
1351 }
1352 void set_global_writer() {
1353 assert(_global_writer == NULL, "Error");
1354 _global_writer = _local_writer;
1355 }
1356 void clear_global_dumper() { _global_dumper = NULL; }
1357 void clear_global_writer() { _global_writer = NULL; }
1359 bool is_segmented_dump() const { return _is_segmented_dump; }
1360 void set_segmented_dump() { _is_segmented_dump = true; }
1361 jlong dump_start() const { return _dump_start; }
1362 void set_dump_start(jlong pos);
1364 bool skip_operation() const;
1366 // writes a HPROF_LOAD_CLASS record
1367 static void do_load_class(klassOop k);
1369 // writes a HPROF_GC_CLASS_DUMP record for the given class
1370 // (and each array class too)
1371 static void do_class_dump(klassOop k);
1373 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1374 // array (and each multi-dimensional array too)
1375 static void do_basic_type_array_class_dump(klassOop k);
1377 // HPROF_GC_ROOT_THREAD_OBJ records
1378 int do_thread(JavaThread* thread, u4 thread_serial_num);
1379 void do_threads();
1381 void add_class_serial_number(Klass* k, int serial_num) {
1382 _klass_map->at_put_grow(serial_num, k);
1383 }
1385 // HPROF_TRACE and HPROF_FRAME records
1386 void dump_stack_traces();
1388 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1389 void write_dump_header();
1391 // fixes up the length of the current dump record
1392 void write_current_dump_record_length();
1394 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1395 // record in the case of a segmented heap dump)
1396 void end_of_dump();
1398 public:
1399 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) :
1400 VM_GC_Operation(0 /* total collections, dummy, ignored */,
1401 GCCause::_heap_dump /* GC Cause */,
1402 0 /* total full collections, dummy, ignored */,
1403 gc_before_heap_dump) {
1404 _local_writer = writer;
1405 _gc_before_heap_dump = gc_before_heap_dump;
1406 _is_segmented_dump = false;
1407 _dump_start = (jlong)-1;
1408 _klass_map = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true);
1409 _stack_traces = NULL;
1410 _num_threads = 0;
1411 if (oome) {
1412 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread");
1413 // get OutOfMemoryError zero-parameter constructor
1414 instanceKlass* oome_ik = instanceKlass::cast(SystemDictionary::OutOfMemoryError_klass());
1415 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(),
1416 vmSymbols::void_method_signature());
1417 // get thread throwing OOME when generating the heap dump at OOME
1418 _oome_thread = JavaThread::current();
1419 } else {
1420 _oome_thread = NULL;
1421 _oome_constructor = NULL;
1422 }
1423 }
1424 ~VM_HeapDumper() {
1425 if (_stack_traces != NULL) {
1426 for (int i=0; i < _num_threads; i++) {
1427 delete _stack_traces[i];
1428 }
1429 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces);
1430 }
1431 delete _klass_map;
1432 }
1434 VMOp_Type type() const { return VMOp_HeapDumper; }
1435 // used to mark sub-record boundary
1436 void check_segment_length();
1437 void doit();
1438 };
1440 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL;
1441 DumpWriter* VM_HeapDumper::_global_writer = NULL;
1443 bool VM_HeapDumper::skip_operation() const {
1444 return false;
1445 }
1447 // sets the dump starting position
1448 void VM_HeapDumper::set_dump_start(jlong pos) {
1449 _dump_start = pos;
1450 }
1452 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1453 void VM_HeapDumper::write_dump_header() {
1454 if (writer()->is_open()) {
1455 if (is_segmented_dump()) {
1456 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT);
1457 } else {
1458 writer()->write_u1(HPROF_HEAP_DUMP);
1459 }
1460 writer()->write_u4(0); // current ticks
1462 // record the starting position for the dump (its length will be fixed up later)
1463 set_dump_start(writer()->current_offset());
1464 writer()->write_u4(0);
1465 }
1466 }
1468 // fixes up the length of the current dump record
1469 void VM_HeapDumper::write_current_dump_record_length() {
1470 if (writer()->is_open()) {
1471 assert(dump_start() >= 0, "no dump start recorded");
1473 // calculate the size of the dump record
1474 jlong dump_end = writer()->current_offset();
1475 jlong dump_len = (dump_end - dump_start() - 4);
1477 // record length must fit in a u4
1478 if (dump_len > (jlong)(4L*(jlong)G)) {
1479 warning("record is too large");
1480 }
1482 // seek to the dump start and fix-up the length
1483 writer()->seek_to_offset(dump_start());
1484 writer()->write_u4((u4)dump_len);
1486 // adjust the total size written to keep the bytes written correct.
1487 writer()->adjust_bytes_written(-((long) sizeof(u4)));
1489 // seek to dump end so we can continue
1490 writer()->seek_to_offset(dump_end);
1492 // no current dump record
1493 set_dump_start((jlong)-1);
1494 }
1495 }
1497 // used on a sub-record boundary to check if we need to start a
1498 // new segment.
1499 void VM_HeapDumper::check_segment_length() {
1500 if (writer()->is_open()) {
1501 if (is_segmented_dump()) {
1502 // don't use current_offset that would be too expensive on a per record basis
1503 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten();
1504 assert(dump_end == writer()->current_offset(), "checking");
1505 jlong dump_len = (dump_end - dump_start() - 4);
1506 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length");
1508 if (dump_len > (jlong)HeapDumpSegmentSize) {
1509 write_current_dump_record_length();
1510 write_dump_header();
1511 }
1512 }
1513 }
1514 }
1516 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1517 // record in the case of a segmented heap dump)
1518 void VM_HeapDumper::end_of_dump() {
1519 if (writer()->is_open()) {
1520 write_current_dump_record_length();
1522 // for segmented dump we write the end record
1523 if (is_segmented_dump()) {
1524 writer()->write_u1(HPROF_HEAP_DUMP_END);
1525 writer()->write_u4(0);
1526 writer()->write_u4(0);
1527 }
1528 }
1529 }
1531 // marks sub-record boundary
1532 void HeapObjectDumper::mark_end_of_record() {
1533 dumper()->check_segment_length();
1534 }
1536 // writes a HPROF_LOAD_CLASS record for the class (and each of its
1537 // array classes)
1538 void VM_HeapDumper::do_load_class(klassOop k) {
1539 static u4 class_serial_num = 0;
1541 // len of HPROF_LOAD_CLASS record
1542 u4 remaining = 2*oopSize + 2*sizeof(u4);
1544 // write a HPROF_LOAD_CLASS for the class and each array class
1545 do {
1546 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining);
1548 // class serial number is just a number
1549 writer()->write_u4(++class_serial_num);
1551 // class ID
1552 Klass* klass = Klass::cast(k);
1553 writer()->write_classID(klass);
1555 // add the klassOop and class serial number pair
1556 dumper()->add_class_serial_number(klass, class_serial_num);
1558 writer()->write_u4(STACK_TRACE_ID);
1560 // class name ID
1561 Symbol* name = klass->name();
1562 writer()->write_symbolID(name);
1564 // write a LOAD_CLASS record for the array type (if it exists)
1565 k = klass->array_klass_or_null();
1566 } while (k != NULL);
1567 }
1569 // writes a HPROF_GC_CLASS_DUMP record for the given class
1570 void VM_HeapDumper::do_class_dump(klassOop k) {
1571 DumperSupport::dump_class_and_array_classes(writer(), k);
1572 }
1574 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1575 // array (and each multi-dimensional array too)
1576 void VM_HeapDumper::do_basic_type_array_class_dump(klassOop k) {
1577 DumperSupport::dump_basic_type_array_class(writer(), k);
1578 }
1580 // Walk the stack of the given thread.
1581 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local
1582 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local
1583 //
1584 // It returns the number of Java frames in this thread stack
1585 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) {
1586 JNILocalsDumper blk(writer(), thread_serial_num);
1588 oop threadObj = java_thread->threadObj();
1589 assert(threadObj != NULL, "sanity check");
1591 int stack_depth = 0;
1592 if (java_thread->has_last_Java_frame()) {
1594 // vframes are resource allocated
1595 Thread* current_thread = Thread::current();
1596 ResourceMark rm(current_thread);
1597 HandleMark hm(current_thread);
1599 RegisterMap reg_map(java_thread);
1600 frame f = java_thread->last_frame();
1601 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
1602 frame* last_entry_frame = NULL;
1603 int extra_frames = 0;
1605 if (java_thread == _oome_thread && _oome_constructor != NULL) {
1606 extra_frames++;
1607 }
1608 while (vf != NULL) {
1609 blk.set_frame_number(stack_depth);
1610 if (vf->is_java_frame()) {
1612 // java frame (interpreted, compiled, ...)
1613 javaVFrame *jvf = javaVFrame::cast(vf);
1614 if (!(jvf->method()->is_native())) {
1615 StackValueCollection* locals = jvf->locals();
1616 for (int slot=0; slot<locals->size(); slot++) {
1617 if (locals->at(slot)->type() == T_OBJECT) {
1618 oop o = locals->obj_at(slot)();
1620 if (o != NULL) {
1621 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME);
1622 writer()->write_objectID(o);
1623 writer()->write_u4(thread_serial_num);
1624 writer()->write_u4((u4) (stack_depth + extra_frames));
1625 }
1626 }
1627 }
1628 } else {
1629 // native frame
1630 if (stack_depth == 0) {
1631 // JNI locals for the top frame.
1632 java_thread->active_handles()->oops_do(&blk);
1633 } else {
1634 if (last_entry_frame != NULL) {
1635 // JNI locals for the entry frame
1636 assert(last_entry_frame->is_entry_frame(), "checking");
1637 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk);
1638 }
1639 }
1640 }
1641 // increment only for Java frames
1642 stack_depth++;
1643 last_entry_frame = NULL;
1645 } else {
1646 // externalVFrame - if it's an entry frame then report any JNI locals
1647 // as roots when we find the corresponding native javaVFrame
1648 frame* fr = vf->frame_pointer();
1649 assert(fr != NULL, "sanity check");
1650 if (fr->is_entry_frame()) {
1651 last_entry_frame = fr;
1652 }
1653 if (fr->is_ricochet_frame()) {
1654 fr->oops_ricochet_do(&blk, vf->register_map());
1655 }
1656 }
1657 vf = vf->sender();
1658 }
1659 } else {
1660 // no last java frame but there may be JNI locals
1661 java_thread->active_handles()->oops_do(&blk);
1662 }
1663 return stack_depth;
1664 }
1667 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk
1668 // the stack so that locals and JNI locals are dumped.
1669 void VM_HeapDumper::do_threads() {
1670 for (int i=0; i < _num_threads; i++) {
1671 JavaThread* thread = _stack_traces[i]->thread();
1672 oop threadObj = thread->threadObj();
1673 u4 thread_serial_num = i+1;
1674 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID;
1675 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ);
1676 writer()->write_objectID(threadObj);
1677 writer()->write_u4(thread_serial_num); // thread number
1678 writer()->write_u4(stack_serial_num); // stack trace serial number
1679 int num_frames = do_thread(thread, thread_serial_num);
1680 assert(num_frames == _stack_traces[i]->get_stack_depth(),
1681 "total number of Java frames not matched");
1682 }
1683 }
1686 // The VM operation that dumps the heap. The dump consists of the following
1687 // records:
1688 //
1689 // HPROF_HEADER
1690 // [HPROF_UTF8]*
1691 // [HPROF_LOAD_CLASS]*
1692 // [[HPROF_FRAME]*|HPROF_TRACE]*
1693 // [HPROF_GC_CLASS_DUMP]*
1694 // HPROF_HEAP_DUMP
1695 //
1696 // The HPROF_TRACE records represent the stack traces where the heap dump
1697 // is generated and a "dummy trace" record which does not include
1698 // any frames. The dummy trace record is used to be referenced as the
1699 // unknown object alloc site.
1700 //
1701 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow
1702 // the heap dump be generated in a single pass we remember the position of
1703 // the dump length and fix it up after all sub-records have been written.
1704 // To generate the sub-records we iterate over the heap, writing
1705 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP
1706 // records as we go. Once that is done we write records for some of the GC
1707 // roots.
1709 void VM_HeapDumper::doit() {
1711 HandleMark hm;
1712 CollectedHeap* ch = Universe::heap();
1714 ch->ensure_parsability(false); // must happen, even if collection does
1715 // not happen (e.g. due to GC_locker)
1717 if (_gc_before_heap_dump) {
1718 if (GC_locker::is_active()) {
1719 warning("GC locker is held; pre-heapdump GC was skipped");
1720 } else {
1721 ch->collect_as_vm_thread(GCCause::_heap_dump);
1722 }
1723 }
1725 // At this point we should be the only dumper active, so
1726 // the following should be safe.
1727 set_global_dumper();
1728 set_global_writer();
1730 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1
1731 size_t used = ch->used();
1732 const char* header;
1733 if (used > (size_t)SegmentedHeapDumpThreshold) {
1734 set_segmented_dump();
1735 header = "JAVA PROFILE 1.0.2";
1736 } else {
1737 header = "JAVA PROFILE 1.0.1";
1738 }
1740 // header is few bytes long - no chance to overflow int
1741 writer()->write_raw((void*)header, (int)strlen(header));
1742 writer()->write_u1(0); // terminator
1743 writer()->write_u4(oopSize);
1744 writer()->write_u8(os::javaTimeMillis());
1746 // HPROF_UTF8 records
1747 SymbolTableDumper sym_dumper(writer());
1748 SymbolTable::symbols_do(&sym_dumper);
1750 // write HPROF_LOAD_CLASS records
1751 SystemDictionary::classes_do(&do_load_class);
1752 Universe::basic_type_classes_do(&do_load_class);
1754 // write HPROF_FRAME and HPROF_TRACE records
1755 // this must be called after _klass_map is built when iterating the classes above.
1756 dump_stack_traces();
1758 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT
1759 write_dump_header();
1761 // Writes HPROF_GC_CLASS_DUMP records
1762 SystemDictionary::classes_do(&do_class_dump);
1763 Universe::basic_type_classes_do(&do_basic_type_array_class_dump);
1764 check_segment_length();
1766 // writes HPROF_GC_INSTANCE_DUMP records.
1767 // After each sub-record is written check_segment_length will be invoked. When
1768 // generated a segmented heap dump this allows us to check if the current
1769 // segment exceeds a threshold and if so, then a new segment is started.
1770 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk
1771 // of the heap dump.
1772 HeapObjectDumper obj_dumper(this, writer());
1773 Universe::heap()->safe_object_iterate(&obj_dumper);
1775 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals
1776 do_threads();
1777 check_segment_length();
1779 // HPROF_GC_ROOT_MONITOR_USED
1780 MonitorUsedDumper mon_dumper(writer());
1781 ObjectSynchronizer::oops_do(&mon_dumper);
1782 check_segment_length();
1784 // HPROF_GC_ROOT_JNI_GLOBAL
1785 JNIGlobalsDumper jni_dumper(writer());
1786 JNIHandles::oops_do(&jni_dumper);
1787 check_segment_length();
1789 // HPROF_GC_ROOT_STICKY_CLASS
1790 StickyClassDumper class_dumper(writer());
1791 SystemDictionary::always_strong_oops_do(&class_dumper);
1793 // fixes up the length of the dump record. In the case of a segmented
1794 // heap then the HPROF_HEAP_DUMP_END record is also written.
1795 end_of_dump();
1797 // Now we clear the global variables, so that a future dumper might run.
1798 clear_global_dumper();
1799 clear_global_writer();
1800 }
1802 void VM_HeapDumper::dump_stack_traces() {
1803 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites
1804 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4));
1805 writer()->write_u4((u4) STACK_TRACE_ID);
1806 writer()->write_u4(0); // thread number
1807 writer()->write_u4(0); // frame count
1809 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads());
1810 int frame_serial_num = 0;
1811 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) {
1812 oop threadObj = thread->threadObj();
1813 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) {
1814 // dump thread stack trace
1815 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false);
1816 stack_trace->dump_stack_at_safepoint(-1);
1817 _stack_traces[_num_threads++] = stack_trace;
1819 // write HPROF_FRAME records for this thread's stack trace
1820 int depth = stack_trace->get_stack_depth();
1821 int thread_frame_start = frame_serial_num;
1822 int extra_frames = 0;
1823 // write fake frame that makes it look like the thread, which caused OOME,
1824 // is in the OutOfMemoryError zero-parameter constructor
1825 if (thread == _oome_thread && _oome_constructor != NULL) {
1826 int oome_serial_num = _klass_map->find(Klass::cast(_oome_constructor->method_holder()));
1827 // the class serial number starts from 1
1828 assert(oome_serial_num > 0, "OutOfMemoryError class not found");
1829 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num,
1830 _oome_constructor, 0);
1831 extra_frames++;
1832 }
1833 for (int j=0; j < depth; j++) {
1834 StackFrameInfo* frame = stack_trace->stack_frame_at(j);
1835 methodOop m = frame->method();
1836 int class_serial_num = _klass_map->find(Klass::cast(m->method_holder()));
1837 // the class serial number starts from 1
1838 assert(class_serial_num > 0, "class not found");
1839 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci());
1840 }
1841 depth += extra_frames;
1843 // write HPROF_TRACE record for one thread
1844 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize);
1845 int stack_serial_num = _num_threads + STACK_TRACE_ID;
1846 writer()->write_u4(stack_serial_num); // stack trace serial number
1847 writer()->write_u4((u4) _num_threads); // thread serial number
1848 writer()->write_u4(depth); // frame count
1849 for (int j=1; j <= depth; j++) {
1850 writer()->write_id(thread_frame_start + j);
1851 }
1852 }
1853 }
1854 }
1856 // dump the heap to given path.
1857 int HeapDumper::dump(const char* path) {
1858 assert(path != NULL && strlen(path) > 0, "path missing");
1860 // print message in interactive case
1861 if (print_to_tty()) {
1862 tty->print_cr("Dumping heap to %s ...", path);
1863 timer()->start();
1864 }
1866 // create the dump writer. If the file can be opened then bail
1867 DumpWriter writer(path);
1868 if (!writer.is_open()) {
1869 set_error(writer.error());
1870 if (print_to_tty()) {
1871 tty->print_cr("Unable to create %s: %s", path,
1872 (error() != NULL) ? error() : "reason unknown");
1873 }
1874 return -1;
1875 }
1877 // generate the dump
1878 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome);
1879 if (Thread::current()->is_VM_thread()) {
1880 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint");
1881 dumper.doit();
1882 } else {
1883 VMThread::execute(&dumper);
1884 }
1886 // close dump file and record any error that the writer may have encountered
1887 writer.close();
1888 set_error(writer.error());
1890 // print message in interactive case
1891 if (print_to_tty()) {
1892 timer()->stop();
1893 if (error() == NULL) {
1894 char msg[256];
1895 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]",
1896 os::jlong_format_specifier(), timer()->seconds());
1897 tty->print_cr(msg, writer.bytes_written());
1898 } else {
1899 tty->print_cr("Dump file is incomplete: %s", writer.error());
1900 }
1901 }
1903 return (writer.error() == NULL) ? 0 : -1;
1904 }
1906 // stop timer (if still active), and free any error string we might be holding
1907 HeapDumper::~HeapDumper() {
1908 if (timer()->is_active()) {
1909 timer()->stop();
1910 }
1911 set_error(NULL);
1912 }
1915 // returns the error string (resource allocated), or NULL
1916 char* HeapDumper::error_as_C_string() const {
1917 if (error() != NULL) {
1918 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1);
1919 strcpy(str, error());
1920 return str;
1921 } else {
1922 return NULL;
1923 }
1924 }
1926 // set the error string
1927 void HeapDumper::set_error(char* error) {
1928 if (_error != NULL) {
1929 os::free(_error);
1930 }
1931 if (error == NULL) {
1932 _error = NULL;
1933 } else {
1934 _error = os::strdup(error);
1935 assert(_error != NULL, "allocation failure");
1936 }
1937 }
1939 // Called by out-of-memory error reporting by a single Java thread
1940 // outside of a JVM safepoint
1941 void HeapDumper::dump_heap_from_oome() {
1942 HeapDumper::dump_heap(true);
1943 }
1945 // Called by error reporting by a single Java thread outside of a JVM safepoint,
1946 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various
1947 // callers are strictly serialized and guaranteed not to interfere below. For more
1948 // general use, however, this method will need modification to prevent
1949 // inteference when updating the static variables base_path and dump_file_seq below.
1950 void HeapDumper::dump_heap() {
1951 HeapDumper::dump_heap(false);
1952 }
1954 void HeapDumper::dump_heap(bool oome) {
1955 static char base_path[JVM_MAXPATHLEN] = {'\0'};
1956 static uint dump_file_seq = 0;
1957 char* my_path;
1958 const int max_digit_chars = 20;
1960 const char* dump_file_name = "java_pid";
1961 const char* dump_file_ext = ".hprof";
1963 // The dump file defaults to java_pid<pid>.hprof in the current working
1964 // directory. HeapDumpPath=<file> can be used to specify an alternative
1965 // dump file name or a directory where dump file is created.
1966 if (dump_file_seq == 0) { // first time in, we initialize base_path
1967 // Calculate potentially longest base path and check if we have enough
1968 // allocated statically.
1969 const size_t total_length =
1970 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) +
1971 strlen(os::file_separator()) + max_digit_chars +
1972 strlen(dump_file_name) + strlen(dump_file_ext) + 1;
1973 if (total_length > sizeof(base_path)) {
1974 warning("Cannot create heap dump file. HeapDumpPath is too long.");
1975 return;
1976 }
1978 bool use_default_filename = true;
1979 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') {
1980 // HeapDumpPath=<file> not specified
1981 } else {
1982 strncpy(base_path, HeapDumpPath, sizeof(base_path));
1983 // check if the path is a directory (must exist)
1984 DIR* dir = os::opendir(base_path);
1985 if (dir == NULL) {
1986 use_default_filename = false;
1987 } else {
1988 // HeapDumpPath specified a directory. We append a file separator
1989 // (if needed).
1990 os::closedir(dir);
1991 size_t fs_len = strlen(os::file_separator());
1992 if (strlen(base_path) >= fs_len) {
1993 char* end = base_path;
1994 end += (strlen(base_path) - fs_len);
1995 if (strcmp(end, os::file_separator()) != 0) {
1996 strcat(base_path, os::file_separator());
1997 }
1998 }
1999 }
2000 }
2001 // If HeapDumpPath wasn't a file name then we append the default name
2002 if (use_default_filename) {
2003 const size_t dlen = strlen(base_path); // if heap dump dir specified
2004 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s",
2005 dump_file_name, os::current_process_id(), dump_file_ext);
2006 }
2007 const size_t len = strlen(base_path) + 1;
2008 my_path = (char*)os::malloc(len);
2009 if (my_path == NULL) {
2010 warning("Cannot create heap dump file. Out of system memory.");
2011 return;
2012 }
2013 strncpy(my_path, base_path, len);
2014 } else {
2015 // Append a sequence number id for dumps following the first
2016 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0
2017 my_path = (char*)os::malloc(len);
2018 if (my_path == NULL) {
2019 warning("Cannot create heap dump file. Out of system memory.");
2020 return;
2021 }
2022 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq);
2023 }
2024 dump_file_seq++; // increment seq number for next time we dump
2026 HeapDumper dumper(false /* no GC before heap dump */,
2027 true /* send to tty */,
2028 oome /* pass along out-of-memory-error flag */);
2029 dumper.dump(my_path);
2030 os::free(my_path);
2031 }
