1 /*
2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "gc_implementation/shared/vmGCOperations.hpp"
30 #include "memory/gcLocker.inline.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/objArrayKlass.hpp"
34 #include "runtime/javaCalls.hpp"
35 #include "runtime/jniHandles.hpp"
36 #include "runtime/os.hpp"
37 #include "runtime/reflectionUtils.hpp"
38 #include "runtime/vframe.hpp"
39 #include "runtime/vmThread.hpp"
40 #include "runtime/vm_operations.hpp"
41 #include "services/heapDumper.hpp"
42 #include "services/threadService.hpp"
43 #include "utilities/ostream.hpp"
44 #include "utilities/macros.hpp"
45 #if INCLUDE_ALL_GCS
46 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
47 #endif // INCLUDE_ALL_GCS
48
49 /*
50 * HPROF binary format - description copied from:
51 * src/share/demo/jvmti/hprof/hprof_io.c
52 *
53 *
54 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2"
55 * (0-terminated)
56 *
57 * u4 size of identifiers. Identifiers are used to represent
58 * UTF8 strings, objects, stack traces, etc. They usually
59 * have the same size as host pointers. For example, on
60 * Solaris and Win32, the size is 4.
61 * u4 high word
62 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70
63 * [record]* a sequence of records.
64 *
65 *
66 * Record format:
67 *
68 * u1 a TAG denoting the type of the record
69 * u4 number of *microseconds* since the time stamp in the
70 * header. (wraps around in a little more than an hour)
71 * u4 number of bytes *remaining* in the record. Note that
72 * this number excludes the tag and the length field itself.
73 * [u1]* BODY of the record (a sequence of bytes)
74 *
75 *
76 * The following TAGs are supported:
77 *
78 * TAG BODY notes
79 *----------------------------------------------------------
80 * HPROF_UTF8 a UTF8-encoded name
81 *
82 * id name ID
83 * [u1]* UTF8 characters (no trailing zero)
84 *
85 * HPROF_LOAD_CLASS a newly loaded class
86 *
87 * u4 class serial number (> 0)
88 * id class object ID
89 * u4 stack trace serial number
90 * id class name ID
91 *
92 * HPROF_UNLOAD_CLASS an unloading class
93 *
94 * u4 class serial_number
95 *
96 * HPROF_FRAME a Java stack frame
97 *
98 * id stack frame ID
99 * id method name ID
100 * id method signature ID
101 * id source file name ID
102 * u4 class serial number
103 * i4 line number. >0: normal
104 * -1: unknown
105 * -2: compiled method
106 * -3: native method
107 *
108 * HPROF_TRACE a Java stack trace
109 *
110 * u4 stack trace serial number
111 * u4 thread serial number
112 * u4 number of frames
113 * [id]* stack frame IDs
114 *
115 *
116 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC
117 *
118 * u2 flags 0x0001: incremental vs. complete
119 * 0x0002: sorted by allocation vs. live
120 * 0x0004: whether to force a GC
121 * u4 cutoff ratio
122 * u4 total live bytes
123 * u4 total live instances
124 * u8 total bytes allocated
125 * u8 total instances allocated
126 * u4 number of sites that follow
127 * [u1 is_array: 0: normal object
128 * 2: object array
129 * 4: boolean array
130 * 5: char array
131 * 6: float array
132 * 7: double array
133 * 8: byte array
134 * 9: short array
135 * 10: int array
136 * 11: long array
137 * u4 class serial number (may be zero during startup)
138 * u4 stack trace serial number
139 * u4 number of bytes alive
140 * u4 number of instances alive
141 * u4 number of bytes allocated
142 * u4]* number of instance allocated
143 *
144 * HPROF_START_THREAD a newly started thread.
145 *
146 * u4 thread serial number (> 0)
147 * id thread object ID
148 * u4 stack trace serial number
149 * id thread name ID
150 * id thread group name ID
151 * id thread group parent name ID
152 *
153 * HPROF_END_THREAD a terminating thread.
154 *
155 * u4 thread serial number
156 *
157 * HPROF_HEAP_SUMMARY heap summary
158 *
159 * u4 total live bytes
160 * u4 total live instances
161 * u8 total bytes allocated
162 * u8 total instances allocated
163 *
164 * HPROF_HEAP_DUMP denote a heap dump
165 *
166 * [heap dump sub-records]*
167 *
168 * There are four kinds of heap dump sub-records:
169 *
170 * u1 sub-record type
171 *
172 * HPROF_GC_ROOT_UNKNOWN unknown root
173 *
174 * id object ID
175 *
176 * HPROF_GC_ROOT_THREAD_OBJ thread object
177 *
178 * id thread object ID (may be 0 for a
179 * thread newly attached through JNI)
180 * u4 thread sequence number
181 * u4 stack trace sequence number
182 *
183 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root
184 *
185 * id object ID
186 * id JNI global ref ID
187 *
188 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref
189 *
190 * id object ID
191 * u4 thread serial number
192 * u4 frame # in stack trace (-1 for empty)
193 *
194 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame
195 *
196 * id object ID
197 * u4 thread serial number
198 * u4 frame # in stack trace (-1 for empty)
199 *
200 * HPROF_GC_ROOT_NATIVE_STACK Native stack
201 *
202 * id object ID
203 * u4 thread serial number
204 *
205 * HPROF_GC_ROOT_STICKY_CLASS System class
206 *
207 * id object ID
208 *
209 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block
210 *
211 * id object ID
212 * u4 thread serial number
213 *
214 * HPROF_GC_ROOT_MONITOR_USED Busy monitor
215 *
216 * id object ID
217 *
218 * HPROF_GC_CLASS_DUMP dump of a class object
219 *
220 * id class object ID
221 * u4 stack trace serial number
222 * id super class object ID
223 * id class loader object ID
224 * id signers object ID
225 * id protection domain object ID
226 * id reserved
227 * id reserved
228 *
229 * u4 instance size (in bytes)
230 *
231 * u2 size of constant pool
232 * [u2, constant pool index,
233 * ty, type
234 * 2: object
235 * 4: boolean
236 * 5: char
237 * 6: float
238 * 7: double
239 * 8: byte
240 * 9: short
241 * 10: int
242 * 11: long
243 * vl]* and value
244 *
245 * u2 number of static fields
246 * [id, static field name,
247 * ty, type,
248 * vl]* and value
249 *
250 * u2 number of inst. fields (not inc. super)
251 * [id, instance field name,
252 * ty]* type
253 *
254 * HPROF_GC_INSTANCE_DUMP dump of a normal object
255 *
256 * id object ID
257 * u4 stack trace serial number
258 * id class object ID
259 * u4 number of bytes that follow
260 * [vl]* instance field values (class, followed
261 * by super, super's super ...)
262 *
263 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array
264 *
265 * id array object ID
266 * u4 stack trace serial number
267 * u4 number of elements
268 * id array class ID
269 * [id]* elements
270 *
271 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array
272 *
273 * id array object ID
274 * u4 stack trace serial number
275 * u4 number of elements
276 * u1 element type
277 * 4: boolean array
278 * 5: char array
279 * 6: float array
280 * 7: double array
281 * 8: byte array
282 * 9: short array
283 * 10: int array
284 * 11: long array
285 * [u1]* elements
286 *
287 * HPROF_CPU_SAMPLES a set of sample traces of running threads
288 *
289 * u4 total number of samples
290 * u4 # of traces
291 * [u4 # of samples
292 * u4]* stack trace serial number
293 *
294 * HPROF_CONTROL_SETTINGS the settings of on/off switches
295 *
296 * u4 0x00000001: alloc traces on/off
297 * 0x00000002: cpu sampling on/off
298 * u2 stack trace depth
299 *
300 *
301 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally
302 * be generated as a sequence of heap dump segments. This sequence is
303 * terminated by an end record. The additional tags allowed by format
304 * "JAVA PROFILE 1.0.2" are:
305 *
306 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment
307 *
308 * [heap dump sub-records]*
309 * The same sub-record types allowed by HPROF_HEAP_DUMP
310 *
311 * HPROF_HEAP_DUMP_END denotes the end of a heap dump
312 *
313 */
314
315
316 // HPROF tags
317
318 typedef enum {
319 // top-level records
320 HPROF_UTF8 = 0x01,
321 HPROF_LOAD_CLASS = 0x02,
322 HPROF_UNLOAD_CLASS = 0x03,
323 HPROF_FRAME = 0x04,
324 HPROF_TRACE = 0x05,
325 HPROF_ALLOC_SITES = 0x06,
326 HPROF_HEAP_SUMMARY = 0x07,
327 HPROF_START_THREAD = 0x0A,
328 HPROF_END_THREAD = 0x0B,
329 HPROF_HEAP_DUMP = 0x0C,
330 HPROF_CPU_SAMPLES = 0x0D,
331 HPROF_CONTROL_SETTINGS = 0x0E,
332
333 // 1.0.2 record types
334 HPROF_HEAP_DUMP_SEGMENT = 0x1C,
335 HPROF_HEAP_DUMP_END = 0x2C,
336
337 // field types
338 HPROF_ARRAY_OBJECT = 0x01,
339 HPROF_NORMAL_OBJECT = 0x02,
340 HPROF_BOOLEAN = 0x04,
341 HPROF_CHAR = 0x05,
342 HPROF_FLOAT = 0x06,
343 HPROF_DOUBLE = 0x07,
344 HPROF_BYTE = 0x08,
345 HPROF_SHORT = 0x09,
346 HPROF_INT = 0x0A,
347 HPROF_LONG = 0x0B,
348
349 // data-dump sub-records
350 HPROF_GC_ROOT_UNKNOWN = 0xFF,
351 HPROF_GC_ROOT_JNI_GLOBAL = 0x01,
352 HPROF_GC_ROOT_JNI_LOCAL = 0x02,
353 HPROF_GC_ROOT_JAVA_FRAME = 0x03,
354 HPROF_GC_ROOT_NATIVE_STACK = 0x04,
355 HPROF_GC_ROOT_STICKY_CLASS = 0x05,
356 HPROF_GC_ROOT_THREAD_BLOCK = 0x06,
357 HPROF_GC_ROOT_MONITOR_USED = 0x07,
358 HPROF_GC_ROOT_THREAD_OBJ = 0x08,
359 HPROF_GC_CLASS_DUMP = 0x20,
360 HPROF_GC_INSTANCE_DUMP = 0x21,
361 HPROF_GC_OBJ_ARRAY_DUMP = 0x22,
362 HPROF_GC_PRIM_ARRAY_DUMP = 0x23
363 } hprofTag;
364
365 // Default stack trace ID (used for dummy HPROF_TRACE record)
366 enum {
367 STACK_TRACE_ID = 1,
368 INITIAL_CLASS_COUNT = 200
369 };
370
371 // Supports I/O operations on a dump file
372
373 class DumpWriter : public StackObj {
374 private:
375 enum {
376 io_buffer_size = 8*M
377 };
378
379 int _fd; // file descriptor (-1 if dump file not open)
380 jlong _bytes_written; // number of byte written to dump file
381
382 char* _buffer; // internal buffer
383 int _size;
384 int _pos;
385
386 char* _error; // error message when I/O fails
387
388 void set_file_descriptor(int fd) { _fd = fd; }
389 int file_descriptor() const { return _fd; }
390
391 char* buffer() const { return _buffer; }
392 int buffer_size() const { return _size; }
393 int position() const { return _pos; }
394 void set_position(int pos) { _pos = pos; }
395
396 void set_error(const char* error) { _error = (char*)os::strdup(error); }
397
398 // all I/O go through this function
399 void write_internal(void* s, int len);
400
401 public:
402 DumpWriter(const char* path);
403 ~DumpWriter();
404
405 void close();
406 bool is_open() const { return file_descriptor() >= 0; }
407 void flush();
408
409 // total number of bytes written to the disk
410 jlong bytes_written() const { return _bytes_written; }
411
412 // adjust the number of bytes written to disk (used to keep the count
413 // of the number of bytes written in case of rewrites)
414 void adjust_bytes_written(jlong n) { _bytes_written += n; }
415
416 // number of (buffered) bytes as yet unwritten to the dump file
417 jlong bytes_unwritten() const { return (jlong)position(); }
418
419 char* error() const { return _error; }
420
421 jlong current_offset();
422 void seek_to_offset(jlong pos);
423
424 // writer functions
425 void write_raw(void* s, int len);
426 void write_u1(u1 x) { write_raw((void*)&x, 1); }
427 void write_u2(u2 x);
428 void write_u4(u4 x);
429 void write_u8(u8 x);
430 void write_objectID(oop o);
431 void write_symbolID(Symbol* o);
432 void write_classID(Klass* k);
433 void write_id(u4 x);
434 };
435
436 DumpWriter::DumpWriter(const char* path) {
437 // try to allocate an I/O buffer of io_buffer_size. If there isn't
438 // sufficient memory then reduce size until we can allocate something.
439 _size = io_buffer_size;
440 do {
441 _buffer = (char*)os::malloc(_size, mtInternal);
442 if (_buffer == NULL) {
443 _size = _size >> 1;
444 }
445 } while (_buffer == NULL && _size > 0);
446 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check");
447 _pos = 0;
448 _error = NULL;
449 _bytes_written = 0L;
450 _fd = os::create_binary_file(path, false); // don't replace existing file
451
452 // if the open failed we record the error
453 if (_fd < 0) {
454 _error = (char*)os::strdup(strerror(errno));
455 }
456 }
457
458 DumpWriter::~DumpWriter() {
459 // flush and close dump file
460 if (is_open()) {
461 close();
462 }
463 if (_buffer != NULL) os::free(_buffer);
464 if (_error != NULL) os::free(_error);
465 }
466
467 // closes dump file (if open)
468 void DumpWriter::close() {
469 // flush and close dump file
470 if (is_open()) {
471 flush();
472 ::close(file_descriptor());
473 set_file_descriptor(-1);
474 }
475 }
476
477 // write directly to the file
478 void DumpWriter::write_internal(void* s, int len) {
479 if (is_open()) {
480 int n = ::write(file_descriptor(), s, len);
481 if (n > 0) {
482 _bytes_written += n;
483 }
484 if (n != len) {
485 if (n < 0) {
486 set_error(strerror(errno));
487 } else {
488 set_error("file size limit");
489 }
490 ::close(file_descriptor());
491 set_file_descriptor(-1);
492 }
493 }
494 }
495
496 // write raw bytes
497 void DumpWriter::write_raw(void* s, int len) {
498 if (is_open()) {
499 // flush buffer to make toom
500 if ((position()+ len) >= buffer_size()) {
501 flush();
502 }
503
504 // buffer not available or too big to buffer it
505 if ((buffer() == NULL) || (len >= buffer_size())) {
506 write_internal(s, len);
507 } else {
508 // Should optimize this for u1/u2/u4/u8 sizes.
509 memcpy(buffer() + position(), s, len);
510 set_position(position() + len);
511 }
512 }
513 }
514
515 // flush any buffered bytes to the file
516 void DumpWriter::flush() {
517 if (is_open() && position() > 0) {
518 write_internal(buffer(), position());
519 set_position(0);
520 }
521 }
522
523
524 jlong DumpWriter::current_offset() {
525 if (is_open()) {
526 // the offset is the file offset plus whatever we have buffered
527 jlong offset = os::current_file_offset(file_descriptor());
528 assert(offset >= 0, "lseek failed");
529 return offset + (jlong)position();
530 } else {
531 return (jlong)-1;
532 }
533 }
534
535 void DumpWriter::seek_to_offset(jlong off) {
536 assert(off >= 0, "bad offset");
537
538 // need to flush before seeking
539 flush();
540
541 // may be closed due to I/O error
542 if (is_open()) {
543 jlong n = os::seek_to_file_offset(file_descriptor(), off);
544 assert(n >= 0, "lseek failed");
545 }
546 }
547
548 void DumpWriter::write_u2(u2 x) {
549 u2 v;
550 Bytes::put_Java_u2((address)&v, x);
551 write_raw((void*)&v, 2);
552 }
553
554 void DumpWriter::write_u4(u4 x) {
555 u4 v;
556 Bytes::put_Java_u4((address)&v, x);
557 write_raw((void*)&v, 4);
558 }
559
560 void DumpWriter::write_u8(u8 x) {
561 u8 v;
562 Bytes::put_Java_u8((address)&v, x);
563 write_raw((void*)&v, 8);
564 }
565
566 void DumpWriter::write_objectID(oop o) {
567 address a = (address)o;
568 #ifdef _LP64
569 write_u8((u8)a);
570 #else
571 write_u4((u4)a);
572 #endif
573 }
574
575 void DumpWriter::write_symbolID(Symbol* s) {
576 address a = (address)((uintptr_t)s);
577 #ifdef _LP64
578 write_u8((u8)a);
579 #else
580 write_u4((u4)a);
581 #endif
582 }
583
584 void DumpWriter::write_id(u4 x) {
585 #ifdef _LP64
586 write_u8((u8) x);
587 #else
588 write_u4(x);
589 #endif
590 }
591
592 // We use java mirror as the class ID
593 void DumpWriter::write_classID(Klass* k) {
594 write_objectID(k->java_mirror());
595 }
596
597
598
599 // Support class with a collection of functions used when dumping the heap
600
601 class DumperSupport : AllStatic {
602 public:
603
604 // write a header of the given type
605 static void write_header(DumpWriter* writer, hprofTag tag, u4 len);
606
607 // returns hprof tag for the given type signature
608 static hprofTag sig2tag(Symbol* sig);
609 // returns hprof tag for the given basic type
610 static hprofTag type2tag(BasicType type);
611
612 // returns the size of the instance of the given class
613 static u4 instance_size(Klass* k);
614
615 // dump a jfloat
616 static void dump_float(DumpWriter* writer, jfloat f);
617 // dump a jdouble
618 static void dump_double(DumpWriter* writer, jdouble d);
619 // dumps the raw value of the given field
620 static void dump_field_value(DumpWriter* writer, char type, address addr);
621 // dumps static fields of the given class
622 static void dump_static_fields(DumpWriter* writer, Klass* k);
623 // dump the raw values of the instance fields of the given object
624 static void dump_instance_fields(DumpWriter* writer, oop o);
625 // dumps the definition of the instance fields for a given class
626 static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k);
627 // creates HPROF_GC_INSTANCE_DUMP record for the given object
628 static void dump_instance(DumpWriter* writer, oop o);
629 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its
630 // array classes
631 static void dump_class_and_array_classes(DumpWriter* writer, Klass* k);
632 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
633 // class (and each multi-dimensional array class too)
634 static void dump_basic_type_array_class(DumpWriter* writer, Klass* k);
635
636 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
637 static void dump_object_array(DumpWriter* writer, objArrayOop array);
638 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
639 static void dump_prim_array(DumpWriter* writer, typeArrayOop array);
640 // create HPROF_FRAME record for the given method and bci
641 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci);
642 };
643
644 // write a header of the given type
645 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) {
646 writer->write_u1((u1)tag);
647 writer->write_u4(0); // current ticks
648 writer->write_u4(len);
649 }
650
651 // returns hprof tag for the given type signature
652 hprofTag DumperSupport::sig2tag(Symbol* sig) {
653 switch (sig->byte_at(0)) {
654 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT;
655 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT;
656 case JVM_SIGNATURE_BYTE : return HPROF_BYTE;
657 case JVM_SIGNATURE_CHAR : return HPROF_CHAR;
658 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT;
659 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE;
660 case JVM_SIGNATURE_INT : return HPROF_INT;
661 case JVM_SIGNATURE_LONG : return HPROF_LONG;
662 case JVM_SIGNATURE_SHORT : return HPROF_SHORT;
663 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN;
664 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
665 }
666 }
667
668 hprofTag DumperSupport::type2tag(BasicType type) {
669 switch (type) {
670 case T_BYTE : return HPROF_BYTE;
671 case T_CHAR : return HPROF_CHAR;
672 case T_FLOAT : return HPROF_FLOAT;
673 case T_DOUBLE : return HPROF_DOUBLE;
674 case T_INT : return HPROF_INT;
675 case T_LONG : return HPROF_LONG;
676 case T_SHORT : return HPROF_SHORT;
677 case T_BOOLEAN : return HPROF_BOOLEAN;
678 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
679 }
680 }
681
682 // dump a jfloat
683 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) {
684 if (g_isnan(f)) {
685 writer->write_u4(0x7fc00000); // collapsing NaNs
686 } else {
687 union {
688 int i;
689 float f;
690 } u;
691 u.f = (float)f;
692 writer->write_u4((u4)u.i);
693 }
694 }
695
696 // dump a jdouble
697 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) {
698 union {
699 jlong l;
700 double d;
701 } u;
702 if (g_isnan(d)) { // collapsing NaNs
703 u.l = (jlong)(0x7ff80000);
704 u.l = (u.l << 32);
705 } else {
706 u.d = (double)d;
707 }
708 writer->write_u8((u8)u.l);
709 }
710
711 // dumps the raw value of the given field
712 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) {
713 switch (type) {
714 case JVM_SIGNATURE_CLASS :
715 case JVM_SIGNATURE_ARRAY : {
716 oop o;
717 if (UseCompressedOops) {
718 o = oopDesc::load_decode_heap_oop((narrowOop*)addr);
719 } else {
720 o = oopDesc::load_decode_heap_oop((oop*)addr);
721 }
722
723 // reflection and sun.misc.Unsafe classes may have a reference to a
724 // Klass* so filter it out.
725 assert(o->is_oop_or_null(), "should always be an oop");
726 writer->write_objectID(o);
727 break;
728 }
729 case JVM_SIGNATURE_BYTE : {
730 jbyte* b = (jbyte*)addr;
731 writer->write_u1((u1)*b);
732 break;
733 }
734 case JVM_SIGNATURE_CHAR : {
735 jchar* c = (jchar*)addr;
736 writer->write_u2((u2)*c);
737 break;
738 }
739 case JVM_SIGNATURE_SHORT : {
740 jshort* s = (jshort*)addr;
741 writer->write_u2((u2)*s);
742 break;
743 }
744 case JVM_SIGNATURE_FLOAT : {
745 jfloat* f = (jfloat*)addr;
746 dump_float(writer, *f);
747 break;
748 }
749 case JVM_SIGNATURE_DOUBLE : {
750 jdouble* f = (jdouble*)addr;
751 dump_double(writer, *f);
752 break;
753 }
754 case JVM_SIGNATURE_INT : {
755 jint* i = (jint*)addr;
756 writer->write_u4((u4)*i);
757 break;
758 }
759 case JVM_SIGNATURE_LONG : {
760 jlong* l = (jlong*)addr;
761 writer->write_u8((u8)*l);
762 break;
763 }
764 case JVM_SIGNATURE_BOOLEAN : {
765 jboolean* b = (jboolean*)addr;
766 writer->write_u1((u1)*b);
767 break;
768 }
769 default : ShouldNotReachHere();
770 }
771 }
772
773 // returns the size of the instance of the given class
774 u4 DumperSupport::instance_size(Klass* k) {
775 HandleMark hm;
776 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
777
778 int size = 0;
779
780 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
781 if (!fld.access_flags().is_static()) {
782 Symbol* sig = fld.signature();
783 switch (sig->byte_at(0)) {
784 case JVM_SIGNATURE_CLASS :
785 case JVM_SIGNATURE_ARRAY : size += oopSize; break;
786
787 case JVM_SIGNATURE_BYTE :
788 case JVM_SIGNATURE_BOOLEAN : size += 1; break;
789
790 case JVM_SIGNATURE_CHAR :
791 case JVM_SIGNATURE_SHORT : size += 2; break;
792
793 case JVM_SIGNATURE_INT :
794 case JVM_SIGNATURE_FLOAT : size += 4; break;
795
796 case JVM_SIGNATURE_LONG :
797 case JVM_SIGNATURE_DOUBLE : size += 8; break;
798
799 default : ShouldNotReachHere();
800 }
801 }
802 }
803 return (u4)size;
804 }
805
806 // dumps static fields of the given class
807 void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) {
808 HandleMark hm;
809 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
810
811 // pass 1 - count the static fields
812 u2 field_count = 0;
813 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
814 if (fldc.access_flags().is_static()) field_count++;
815 }
816
817 oop resolved_references = ((InstanceKlass*)k)->constants()->resolved_references();
818
819 if (resolved_references != NULL) {
820 ++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)ikh->java_mirror() + offset;
836
837 dump_field_value(writer, sig->byte_at(0), addr);
838 }
839 }
840
841 if (resolved_references != NULL) {
842 writer->write_symbolID(vmSymbols::resolved_references_name());
843 writer->write_u1(HPROF_NORMAL_OBJECT);
844 writer->write_objectID(resolved_references);
845 }
846 }
847
848 // dump the raw values of the instance fields of the given object
849 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) {
850 HandleMark hm;
851 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass());
852
853 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
854 if (!fld.access_flags().is_static()) {
855 Symbol* sig = fld.signature();
856 address addr = (address)o + fld.offset();
857
858 dump_field_value(writer, sig->byte_at(0), addr);
859 }
860 }
861 }
862
863 // dumps the definition of the instance fields for a given class
864 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) {
865 HandleMark hm;
866 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
867
868 // pass 1 - count the instance fields
869 u2 field_count = 0;
870 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
871 if (!fldc.access_flags().is_static()) field_count++;
872 }
873
874 writer->write_u2(field_count);
875
876 // pass 2 - dump the field descriptors
877 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) {
878 if (!fld.access_flags().is_static()) {
879 Symbol* sig = fld.signature();
880
881 writer->write_symbolID(fld.name()); // name
882 writer->write_u1(sig2tag(sig)); // type
883 }
884 }
885 }
886
887 // creates HPROF_GC_INSTANCE_DUMP record for the given object
888 void DumperSupport::dump_instance(DumpWriter* writer, oop o) {
889 Klass* k = o->klass();
890
891 writer->write_u1(HPROF_GC_INSTANCE_DUMP);
892 writer->write_objectID(o);
893 writer->write_u4(STACK_TRACE_ID);
894
895 // class ID
896 writer->write_classID(k);
897
898 // number of bytes that follow
899 writer->write_u4(instance_size(k) );
900
901 // field values
902 dump_instance_fields(writer, o);
903 }
904
905 // creates HPROF_GC_CLASS_DUMP record for the given class and each of
906 // its array classes
907 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) {
908 Klass* klass = k;
909 assert(klass->oop_is_instance(), "not an InstanceKlass");
910 InstanceKlass* ik = (InstanceKlass*)klass;
911
912 writer->write_u1(HPROF_GC_CLASS_DUMP);
913
914 // class ID
915 writer->write_classID(ik);
916 writer->write_u4(STACK_TRACE_ID);
917
918 // super class ID
919 Klass* java_super = ik->java_super();
920 if (java_super == NULL) {
921 writer->write_objectID(oop(NULL));
922 } else {
923 writer->write_classID(java_super);
924 }
925
926 writer->write_objectID(ik->class_loader());
927 writer->write_objectID(ik->signers());
928 writer->write_objectID(ik->protection_domain());
929
930 // reserved
931 writer->write_objectID(oop(NULL));
932 writer->write_objectID(oop(NULL));
933
934 // instance size
935 writer->write_u4(DumperSupport::instance_size(k));
936
937 // size of constant pool - ignored by HAT 1.1
938 writer->write_u2(0);
939
940 // number of static fields
941 dump_static_fields(writer, k);
942
943 // description of instance fields
944 dump_instance_field_descriptors(writer, k);
945
946 // array classes
947 k = klass->array_klass_or_null();
948 while (k != NULL) {
949 Klass* klass = k;
950 assert(klass->oop_is_objArray(), "not an ObjArrayKlass");
951
952 writer->write_u1(HPROF_GC_CLASS_DUMP);
953 writer->write_classID(klass);
954 writer->write_u4(STACK_TRACE_ID);
955
956 // super class of array classes is java.lang.Object
957 java_super = klass->java_super();
958 assert(java_super != NULL, "checking");
959 writer->write_classID(java_super);
960
961 writer->write_objectID(ik->class_loader());
962 writer->write_objectID(ik->signers());
963 writer->write_objectID(ik->protection_domain());
964
965 writer->write_objectID(oop(NULL)); // reserved
966 writer->write_objectID(oop(NULL));
967 writer->write_u4(0); // instance size
968 writer->write_u2(0); // constant pool
969 writer->write_u2(0); // static fields
970 writer->write_u2(0); // instance fields
971
972 // get the array class for the next rank
973 k = klass->array_klass_or_null();
974 }
975 }
976
977 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
978 // class (and each multi-dimensional array class too)
979 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) {
980 // array classes
981 while (k != NULL) {
982 Klass* klass = k;
983
984 writer->write_u1(HPROF_GC_CLASS_DUMP);
985 writer->write_classID(klass);
986 writer->write_u4(STACK_TRACE_ID);
987
988 // super class of array classes is java.lang.Object
989 Klass* java_super = klass->java_super();
990 assert(java_super != NULL, "checking");
991 writer->write_classID(java_super);
992
993 writer->write_objectID(oop(NULL)); // loader
994 writer->write_objectID(oop(NULL)); // signers
995 writer->write_objectID(oop(NULL)); // protection domain
996
997 writer->write_objectID(oop(NULL)); // reserved
998 writer->write_objectID(oop(NULL));
999 writer->write_u4(0); // instance size
1000 writer->write_u2(0); // constant pool
1001 writer->write_u2(0); // static fields
1002 writer->write_u2(0); // instance fields
1003
1004 // get the array class for the next rank
1005 k = klass->array_klass_or_null();
1006 }
1007 }
1008
1009 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
1010 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) {
1011
1012 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP);
1013 writer->write_objectID(array);
1014 writer->write_u4(STACK_TRACE_ID);
1015 writer->write_u4((u4)array->length());
1016
1017 // array class ID
1018 writer->write_classID(array->klass());
1019
1020 // [id]* elements
1021 for (int index=0; index<array->length(); index++) {
1022 oop o = array->obj_at(index);
1023 writer->write_objectID(o);
1024 }
1025 }
1026
1027 #define WRITE_ARRAY(Array, Type, Size) \
1028 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); }
1029
1030
1031 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
1032 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) {
1033 BasicType type = TypeArrayKlass::cast(array->klass())->element_type();
1034
1035 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP);
1036 writer->write_objectID(array);
1037 writer->write_u4(STACK_TRACE_ID);
1038 writer->write_u4((u4)array->length());
1039 writer->write_u1(type2tag(type));
1040
1041 // nothing to copy
1042 if (array->length() == 0) {
1043 return;
1044 }
1045
1046 // If the byte ordering is big endian then we can copy most types directly
1047 int length_in_bytes = array->length() * type2aelembytes(type);
1048 assert(length_in_bytes > 0, "nothing to copy");
1049
1050 switch (type) {
1051 case T_INT : {
1052 if (Bytes::is_Java_byte_ordering_different()) {
1053 WRITE_ARRAY(array, int, u4);
1054 } else {
1055 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes);
1056 }
1057 break;
1058 }
1059 case T_BYTE : {
1060 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes);
1061 break;
1062 }
1063 case T_CHAR : {
1064 if (Bytes::is_Java_byte_ordering_different()) {
1065 WRITE_ARRAY(array, char, u2);
1066 } else {
1067 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes);
1068 }
1069 break;
1070 }
1071 case T_SHORT : {
1072 if (Bytes::is_Java_byte_ordering_different()) {
1073 WRITE_ARRAY(array, short, u2);
1074 } else {
1075 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes);
1076 }
1077 break;
1078 }
1079 case T_BOOLEAN : {
1080 if (Bytes::is_Java_byte_ordering_different()) {
1081 WRITE_ARRAY(array, bool, u1);
1082 } else {
1083 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes);
1084 }
1085 break;
1086 }
1087 case T_LONG : {
1088 if (Bytes::is_Java_byte_ordering_different()) {
1089 WRITE_ARRAY(array, long, u8);
1090 } else {
1091 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes);
1092 }
1093 break;
1094 }
1095
1096 // handle float/doubles in a special value to ensure than NaNs are
1097 // written correctly. TO DO: Check if we can avoid this on processors that
1098 // use IEEE 754.
1099
1100 case T_FLOAT : {
1101 for (int i=0; i<array->length(); i++) {
1102 dump_float( writer, array->float_at(i) );
1103 }
1104 break;
1105 }
1106 case T_DOUBLE : {
1107 for (int i=0; i<array->length(); i++) {
1108 dump_double( writer, array->double_at(i) );
1109 }
1110 break;
1111 }
1112 default : ShouldNotReachHere();
1113 }
1114 }
1115
1116 // create a HPROF_FRAME record of the given Method* and bci
1117 void DumperSupport::dump_stack_frame(DumpWriter* writer,
1118 int frame_serial_num,
1119 int class_serial_num,
1120 Method* m,
1121 int bci) {
1122 int line_number;
1123 if (m->is_native()) {
1124 line_number = -3; // native frame
1125 } else {
1126 line_number = m->line_number_from_bci(bci);
1127 }
1128
1129 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4));
1130 writer->write_id(frame_serial_num); // frame serial number
1131 writer->write_symbolID(m->name()); // method's name
1132 writer->write_symbolID(m->signature()); // method's signature
1133
1134 assert(m->method_holder()->oop_is_instance(), "not InstanceKlass");
1135 writer->write_symbolID(m->method_holder()->source_file_name()); // source file name
1136 writer->write_u4(class_serial_num); // class serial number
1137 writer->write_u4((u4) line_number); // line number
1138 }
1139
1140
1141 // Support class used to generate HPROF_UTF8 records from the entries in the
1142 // SymbolTable.
1143
1144 class SymbolTableDumper : public SymbolClosure {
1145 private:
1146 DumpWriter* _writer;
1147 DumpWriter* writer() const { return _writer; }
1148 public:
1149 SymbolTableDumper(DumpWriter* writer) { _writer = writer; }
1150 void do_symbol(Symbol** p);
1151 };
1152
1153 void SymbolTableDumper::do_symbol(Symbol** p) {
1154 ResourceMark rm;
1155 Symbol* sym = load_symbol(p);
1156 int len = sym->utf8_length();
1157 if (len > 0) {
1158 char* s = sym->as_utf8();
1159 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len);
1160 writer()->write_symbolID(sym);
1161 writer()->write_raw(s, len);
1162 }
1163 }
1164
1165 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records
1166
1167 class JNILocalsDumper : public OopClosure {
1168 private:
1169 DumpWriter* _writer;
1170 u4 _thread_serial_num;
1171 int _frame_num;
1172 DumpWriter* writer() const { return _writer; }
1173 public:
1174 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) {
1175 _writer = writer;
1176 _thread_serial_num = thread_serial_num;
1177 _frame_num = -1; // default - empty stack
1178 }
1179 void set_frame_number(int n) { _frame_num = n; }
1180 void do_oop(oop* obj_p);
1181 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1182 };
1183
1184
1185 void JNILocalsDumper::do_oop(oop* obj_p) {
1186 // ignore null or deleted handles
1187 oop o = *obj_p;
1188 if (o != NULL && o != JNIHandles::deleted_handle()) {
1189 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL);
1190 writer()->write_objectID(o);
1191 writer()->write_u4(_thread_serial_num);
1192 writer()->write_u4((u4)_frame_num);
1193 }
1194 }
1195
1196
1197 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records
1198
1199 class JNIGlobalsDumper : public OopClosure {
1200 private:
1201 DumpWriter* _writer;
1202 DumpWriter* writer() const { return _writer; }
1203
1204 public:
1205 JNIGlobalsDumper(DumpWriter* writer) {
1206 _writer = writer;
1207 }
1208 void do_oop(oop* obj_p);
1209 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1210 };
1211
1212 void JNIGlobalsDumper::do_oop(oop* obj_p) {
1213 oop o = *obj_p;
1214
1215 // ignore these
1216 if (o == NULL || o == JNIHandles::deleted_handle()) return;
1217
1218 // we ignore global ref to symbols and other internal objects
1219 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) {
1220 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL);
1221 writer()->write_objectID(o);
1222 writer()->write_objectID((oopDesc*)obj_p); // global ref ID
1223 }
1224 };
1225
1226
1227 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records
1228
1229 class MonitorUsedDumper : public OopClosure {
1230 private:
1231 DumpWriter* _writer;
1232 DumpWriter* writer() const { return _writer; }
1233 public:
1234 MonitorUsedDumper(DumpWriter* writer) {
1235 _writer = writer;
1236 }
1237 void do_oop(oop* obj_p) {
1238 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED);
1239 writer()->write_objectID(*obj_p);
1240 }
1241 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1242 };
1243
1244
1245 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records
1246
1247 class StickyClassDumper : public KlassClosure {
1248 private:
1249 DumpWriter* _writer;
1250 DumpWriter* writer() const { return _writer; }
1251 public:
1252 StickyClassDumper(DumpWriter* writer) {
1253 _writer = writer;
1254 }
1255 void do_klass(Klass* k) {
1256 if (k->oop_is_instance()) {
1257 InstanceKlass* ik = InstanceKlass::cast(k);
1258 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS);
1259 writer()->write_classID(ik);
1260 }
1261 }
1262 };
1263
1264
1265 class VM_HeapDumper;
1266
1267 // Support class using when iterating over the heap.
1268
1269 class HeapObjectDumper : public ObjectClosure {
1270 private:
1271 VM_HeapDumper* _dumper;
1272 DumpWriter* _writer;
1273
1274 VM_HeapDumper* dumper() { return _dumper; }
1275 DumpWriter* writer() { return _writer; }
1276
1277 // used to indicate that a record has been writen
1278 void mark_end_of_record();
1279
1280 public:
1281 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) {
1282 _dumper = dumper;
1283 _writer = writer;
1284 }
1285
1286 // called for each object in the heap
1287 void do_object(oop o);
1288 };
1289
1290 void HeapObjectDumper::do_object(oop o) {
1291 // hide the sentinel for deleted handles
1292 if (o == JNIHandles::deleted_handle()) return;
1293
1294 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records
1295 if (o->klass() == SystemDictionary::Class_klass()) {
1296 if (!java_lang_Class::is_primitive(o)) {
1297 return;
1298 }
1299 }
1300
1301 // create a HPROF_GC_INSTANCE record for each object
1302 if (o->is_instance()) {
1303 DumperSupport::dump_instance(writer(), o);
1304 mark_end_of_record();
1305 } else {
1306 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array
1307 if (o->is_objArray()) {
1308 DumperSupport::dump_object_array(writer(), objArrayOop(o));
1309 mark_end_of_record();
1310 } else {
1311 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array
1312 if (o->is_typeArray()) {
1313 DumperSupport::dump_prim_array(writer(), typeArrayOop(o));
1314 mark_end_of_record();
1315 }
1316 }
1317 }
1318 }
1319
1320 // The VM operation that performs the heap dump
1321 class VM_HeapDumper : public VM_GC_Operation {
1322 private:
1323 static VM_HeapDumper* _global_dumper;
1324 static DumpWriter* _global_writer;
1325 DumpWriter* _local_writer;
1326 JavaThread* _oome_thread;
1327 Method* _oome_constructor;
1328 bool _gc_before_heap_dump;
1329 bool _is_segmented_dump;
1330 jlong _dump_start;
1331 GrowableArray<Klass*>* _klass_map;
1332 ThreadStackTrace** _stack_traces;
1333 int _num_threads;
1334
1335 // accessors and setters
1336 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; }
1337 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; }
1338 void set_global_dumper() {
1339 assert(_global_dumper == NULL, "Error");
1340 _global_dumper = this;
1341 }
1342 void set_global_writer() {
1343 assert(_global_writer == NULL, "Error");
1344 _global_writer = _local_writer;
1345 }
1346 void clear_global_dumper() { _global_dumper = NULL; }
1347 void clear_global_writer() { _global_writer = NULL; }
1348
1349 bool is_segmented_dump() const { return _is_segmented_dump; }
1350 void set_segmented_dump() { _is_segmented_dump = true; }
1351 jlong dump_start() const { return _dump_start; }
1352 void set_dump_start(jlong pos);
1353
1354 bool skip_operation() const;
1355
1356 // writes a HPROF_LOAD_CLASS record
1357 static void do_load_class(Klass* k);
1358
1359 // writes a HPROF_GC_CLASS_DUMP record for the given class
1360 // (and each array class too)
1361 static void do_class_dump(Klass* k);
1362
1363 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1364 // array (and each multi-dimensional array too)
1365 static void do_basic_type_array_class_dump(Klass* k);
1366
1367 // HPROF_GC_ROOT_THREAD_OBJ records
1368 int do_thread(JavaThread* thread, u4 thread_serial_num);
1369 void do_threads();
1370
1371 void add_class_serial_number(Klass* k, int serial_num) {
1372 _klass_map->at_put_grow(serial_num, k);
1373 }
1374
1375 // HPROF_TRACE and HPROF_FRAME records
1376 void dump_stack_traces();
1377
1378 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1379 void write_dump_header();
1380
1381 // fixes up the length of the current dump record
1382 void write_current_dump_record_length();
1383
1384 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1385 // record in the case of a segmented heap dump)
1386 void end_of_dump();
1387
1388 public:
1389 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) :
1390 VM_GC_Operation(0 /* total collections, dummy, ignored */,
1391 GCCause::_heap_dump /* GC Cause */,
1392 0 /* total full collections, dummy, ignored */,
1393 gc_before_heap_dump) {
1394 _local_writer = writer;
1395 _gc_before_heap_dump = gc_before_heap_dump;
1396 _is_segmented_dump = false;
1397 _dump_start = (jlong)-1;
1398 _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true);
1399 _stack_traces = NULL;
1400 _num_threads = 0;
1401 if (oome) {
1402 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread");
1403 // get OutOfMemoryError zero-parameter constructor
1404 InstanceKlass* oome_ik = InstanceKlass::cast(SystemDictionary::OutOfMemoryError_klass());
1405 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(),
1406 vmSymbols::void_method_signature());
1407 // get thread throwing OOME when generating the heap dump at OOME
1408 _oome_thread = JavaThread::current();
1409 } else {
1410 _oome_thread = NULL;
1411 _oome_constructor = NULL;
1412 }
1413 }
1414 ~VM_HeapDumper() {
1415 if (_stack_traces != NULL) {
1416 for (int i=0; i < _num_threads; i++) {
1417 delete _stack_traces[i];
1418 }
1419 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces, mtInternal);
1420 }
1421 delete _klass_map;
1422 }
1423
1424 VMOp_Type type() const { return VMOp_HeapDumper; }
1425 // used to mark sub-record boundary
1426 void check_segment_length();
1427 void doit();
1428 };
1429
1430 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL;
1431 DumpWriter* VM_HeapDumper::_global_writer = NULL;
1432
1433 bool VM_HeapDumper::skip_operation() const {
1434 return false;
1435 }
1436
1437 // sets the dump starting position
1438 void VM_HeapDumper::set_dump_start(jlong pos) {
1439 _dump_start = pos;
1440 }
1441
1442 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1443 void VM_HeapDumper::write_dump_header() {
1444 if (writer()->is_open()) {
1445 if (is_segmented_dump()) {
1446 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT);
1447 } else {
1448 writer()->write_u1(HPROF_HEAP_DUMP);
1449 }
1450 writer()->write_u4(0); // current ticks
1451
1452 // record the starting position for the dump (its length will be fixed up later)
1453 set_dump_start(writer()->current_offset());
1454 writer()->write_u4(0);
1455 }
1456 }
1457
1458 // fixes up the length of the current dump record
1459 void VM_HeapDumper::write_current_dump_record_length() {
1460 if (writer()->is_open()) {
1461 assert(dump_start() >= 0, "no dump start recorded");
1462
1463 // calculate the size of the dump record
1464 jlong dump_end = writer()->current_offset();
1465 jlong dump_len = (dump_end - dump_start() - 4);
1466
1467 // record length must fit in a u4
1468 if (dump_len > (jlong)(4L*(jlong)G)) {
1469 warning("record is too large");
1470 }
1471
1472 // seek to the dump start and fix-up the length
1473 writer()->seek_to_offset(dump_start());
1474 writer()->write_u4((u4)dump_len);
1475
1476 // adjust the total size written to keep the bytes written correct.
1477 writer()->adjust_bytes_written(-((long) sizeof(u4)));
1478
1479 // seek to dump end so we can continue
1480 writer()->seek_to_offset(dump_end);
1481
1482 // no current dump record
1483 set_dump_start((jlong)-1);
1484 }
1485 }
1486
1487 // used on a sub-record boundary to check if we need to start a
1488 // new segment.
1489 void VM_HeapDumper::check_segment_length() {
1490 if (writer()->is_open()) {
1491 if (is_segmented_dump()) {
1492 // don't use current_offset that would be too expensive on a per record basis
1493 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten();
1494 assert(dump_end == writer()->current_offset(), "checking");
1495 jlong dump_len = (dump_end - dump_start() - 4);
1496 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length");
1497
1498 if (dump_len > (jlong)HeapDumpSegmentSize) {
1499 write_current_dump_record_length();
1500 write_dump_header();
1501 }
1502 }
1503 }
1504 }
1505
1506 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1507 // record in the case of a segmented heap dump)
1508 void VM_HeapDumper::end_of_dump() {
1509 if (writer()->is_open()) {
1510 write_current_dump_record_length();
1511
1512 // for segmented dump we write the end record
1513 if (is_segmented_dump()) {
1514 writer()->write_u1(HPROF_HEAP_DUMP_END);
1515 writer()->write_u4(0);
1516 writer()->write_u4(0);
1517 }
1518 }
1519 }
1520
1521 // marks sub-record boundary
1522 void HeapObjectDumper::mark_end_of_record() {
1523 dumper()->check_segment_length();
1524 }
1525
1526 // writes a HPROF_LOAD_CLASS record for the class (and each of its
1527 // array classes)
1528 void VM_HeapDumper::do_load_class(Klass* k) {
1529 static u4 class_serial_num = 0;
1530
1531 // len of HPROF_LOAD_CLASS record
1532 u4 remaining = 2*oopSize + 2*sizeof(u4);
1533
1534 // write a HPROF_LOAD_CLASS for the class and each array class
1535 do {
1536 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining);
1537
1538 // class serial number is just a number
1539 writer()->write_u4(++class_serial_num);
1540
1541 // class ID
1542 Klass* klass = k;
1543 writer()->write_classID(klass);
1544
1545 // add the Klass* and class serial number pair
1546 dumper()->add_class_serial_number(klass, class_serial_num);
1547
1548 writer()->write_u4(STACK_TRACE_ID);
1549
1550 // class name ID
1551 Symbol* name = klass->name();
1552 writer()->write_symbolID(name);
1553
1554 // write a LOAD_CLASS record for the array type (if it exists)
1555 k = klass->array_klass_or_null();
1556 } while (k != NULL);
1557 }
1558
1559 // writes a HPROF_GC_CLASS_DUMP record for the given class
1560 void VM_HeapDumper::do_class_dump(Klass* k) {
1561 if (k->oop_is_instance()) {
1562 DumperSupport::dump_class_and_array_classes(writer(), k);
1563 }
1564 }
1565
1566 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1567 // array (and each multi-dimensional array too)
1568 void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) {
1569 DumperSupport::dump_basic_type_array_class(writer(), k);
1570 }
1571
1572 // Walk the stack of the given thread.
1573 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local
1574 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local
1575 //
1576 // It returns the number of Java frames in this thread stack
1577 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) {
1578 JNILocalsDumper blk(writer(), thread_serial_num);
1579
1580 oop threadObj = java_thread->threadObj();
1581 assert(threadObj != NULL, "sanity check");
1582
1583 int stack_depth = 0;
1584 if (java_thread->has_last_Java_frame()) {
1585
1586 // vframes are resource allocated
1587 Thread* current_thread = Thread::current();
1588 ResourceMark rm(current_thread);
1589 HandleMark hm(current_thread);
1590
1591 RegisterMap reg_map(java_thread);
1592 frame f = java_thread->last_frame();
1593 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
1594 frame* last_entry_frame = NULL;
1595 int extra_frames = 0;
1596
1597 if (java_thread == _oome_thread && _oome_constructor != NULL) {
1598 extra_frames++;
1599 }
1600 while (vf != NULL) {
1601 blk.set_frame_number(stack_depth);
1602 if (vf->is_java_frame()) {
1603
1604 // java frame (interpreted, compiled, ...)
1605 javaVFrame *jvf = javaVFrame::cast(vf);
1606 if (!(jvf->method()->is_native())) {
1607 StackValueCollection* locals = jvf->locals();
1608 for (int slot=0; slot<locals->size(); slot++) {
1609 if (locals->at(slot)->type() == T_OBJECT) {
1610 oop o = locals->obj_at(slot)();
1611
1612 if (o != NULL) {
1613 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME);
1614 writer()->write_objectID(o);
1615 writer()->write_u4(thread_serial_num);
1616 writer()->write_u4((u4) (stack_depth + extra_frames));
1617 }
1618 }
1619 }
1620 StackValueCollection *exprs = jvf->expressions();
1621 for(int index = 0; index < exprs->size(); index++) {
1622 if (exprs->at(index)->type() == T_OBJECT) {
1623 oop o = exprs->obj_at(index)();
1624 if (o != NULL) {
1625 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME);
1626 writer()->write_objectID(o);
1627 writer()->write_u4(thread_serial_num);
1628 writer()->write_u4((u4) (stack_depth + extra_frames));
1629 }
1630 }
1631 }
1632 } else {
1633 // native frame
1634 if (stack_depth == 0) {
1635 // JNI locals for the top frame.
1636 java_thread->active_handles()->oops_do(&blk);
1637 } else {
1638 if (last_entry_frame != NULL) {
1639 // JNI locals for the entry frame
1640 assert(last_entry_frame->is_entry_frame(), "checking");
1641 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk);
1642 }
1643 }
1644 }
1645 // increment only for Java frames
1646 stack_depth++;
1647 last_entry_frame = NULL;
1648
1649 } else {
1650 // externalVFrame - if it's an entry frame then report any JNI locals
1651 // as roots when we find the corresponding native javaVFrame
1652 frame* fr = vf->frame_pointer();
1653 assert(fr != NULL, "sanity check");
1654 if (fr->is_entry_frame()) {
1655 last_entry_frame = fr;
1656 }
1657 }
1658 vf = vf->sender();
1659 }
1660 } else {
1661 // no last java frame but there may be JNI locals
1662 java_thread->active_handles()->oops_do(&blk);
1663 }
1664 return stack_depth;
1665 }
1666
1667
1668 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk
1669 // the stack so that locals and JNI locals are dumped.
1670 void VM_HeapDumper::do_threads() {
1671 for (int i=0; i < _num_threads; i++) {
1672 JavaThread* thread = _stack_traces[i]->thread();
1673 oop threadObj = thread->threadObj();
1674 u4 thread_serial_num = i+1;
1675 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID;
1676 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ);
1677 writer()->write_objectID(threadObj);
1678 writer()->write_u4(thread_serial_num); // thread number
1679 writer()->write_u4(stack_serial_num); // stack trace serial number
1680 int num_frames = do_thread(thread, thread_serial_num);
1681 assert(num_frames == _stack_traces[i]->get_stack_depth(),
1682 "total number of Java frames not matched");
1683 }
1684 }
1685
1686
1687 // The VM operation that dumps the heap. The dump consists of the following
1688 // records:
1689 //
1690 // HPROF_HEADER
1691 // [HPROF_UTF8]*
1692 // [HPROF_LOAD_CLASS]*
1693 // [[HPROF_FRAME]*|HPROF_TRACE]*
1694 // [HPROF_GC_CLASS_DUMP]*
1695 // HPROF_HEAP_DUMP
1696 //
1697 // The HPROF_TRACE records represent the stack traces where the heap dump
1698 // is generated and a "dummy trace" record which does not include
1699 // any frames. The dummy trace record is used to be referenced as the
1700 // unknown object alloc site.
1701 //
1702 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow
1703 // the heap dump be generated in a single pass we remember the position of
1704 // the dump length and fix it up after all sub-records have been written.
1705 // To generate the sub-records we iterate over the heap, writing
1706 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP
1707 // records as we go. Once that is done we write records for some of the GC
1708 // roots.
1709
1710 void VM_HeapDumper::doit() {
1711
1712 HandleMark hm;
1713 CollectedHeap* ch = Universe::heap();
1714
1715 ch->ensure_parsability(false); // must happen, even if collection does
1716 // not happen (e.g. due to GC_locker)
1717
1718 if (_gc_before_heap_dump) {
1719 if (GC_locker::is_active()) {
1720 warning("GC locker is held; pre-heapdump GC was skipped");
1721 } else {
1722 ch->collect_as_vm_thread(GCCause::_heap_dump);
1723 }
1724 }
1725
1726 // At this point we should be the only dumper active, so
1727 // the following should be safe.
1728 set_global_dumper();
1729 set_global_writer();
1730
1731 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1
1732 size_t used = ch->used();
1733 const char* header;
1734 if (used > (size_t)SegmentedHeapDumpThreshold) {
1735 set_segmented_dump();
1736 header = "JAVA PROFILE 1.0.2";
1737 } else {
1738 header = "JAVA PROFILE 1.0.1";
1739 }
1740
1741 // header is few bytes long - no chance to overflow int
1742 writer()->write_raw((void*)header, (int)strlen(header));
1743 writer()->write_u1(0); // terminator
1744 writer()->write_u4(oopSize);
1745 writer()->write_u8(os::javaTimeMillis());
1746
1747 // HPROF_UTF8 records
1748 SymbolTableDumper sym_dumper(writer());
1749 SymbolTable::symbols_do(&sym_dumper);
1750
1751 // write HPROF_LOAD_CLASS records
1752 ClassLoaderDataGraph::classes_do(&do_load_class);
1753 Universe::basic_type_classes_do(&do_load_class);
1754
1755 // write HPROF_FRAME and HPROF_TRACE records
1756 // this must be called after _klass_map is built when iterating the classes above.
1757 dump_stack_traces();
1758
1759 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT
1760 write_dump_header();
1761
1762 // Writes HPROF_GC_CLASS_DUMP records
1763 ClassLoaderDataGraph::classes_do(&do_class_dump);
1764 Universe::basic_type_classes_do(&do_basic_type_array_class_dump);
1765 check_segment_length();
1766
1767 // writes HPROF_GC_INSTANCE_DUMP records.
1768 // After each sub-record is written check_segment_length will be invoked. When
1769 // generated a segmented heap dump this allows us to check if the current
1770 // segment exceeds a threshold and if so, then a new segment is started.
1771 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk
1772 // of the heap dump.
1773 HeapObjectDumper obj_dumper(this, writer());
1774 Universe::heap()->safe_object_iterate(&obj_dumper);
1775
1776 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals
1777 do_threads();
1778 check_segment_length();
1779
1780 // HPROF_GC_ROOT_MONITOR_USED
1781 MonitorUsedDumper mon_dumper(writer());
1782 ObjectSynchronizer::oops_do(&mon_dumper);
1783 check_segment_length();
1784
1785 // HPROF_GC_ROOT_JNI_GLOBAL
1786 JNIGlobalsDumper jni_dumper(writer());
1787 JNIHandles::oops_do(&jni_dumper);
1788 check_segment_length();
1789
1790 // HPROF_GC_ROOT_STICKY_CLASS
1791 StickyClassDumper class_dumper(writer());
1792 SystemDictionary::always_strong_classes_do(&class_dumper);
1793
1794 // fixes up the length of the dump record. In the case of a segmented
1795 // heap then the HPROF_HEAP_DUMP_END record is also written.
1796 end_of_dump();
1797
1798 // Now we clear the global variables, so that a future dumper might run.
1799 clear_global_dumper();
1800 clear_global_writer();
1801 }
1802
1803 void VM_HeapDumper::dump_stack_traces() {
1804 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites
1805 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4));
1806 writer()->write_u4((u4) STACK_TRACE_ID);
1807 writer()->write_u4(0); // thread number
1808 writer()->write_u4(0); // frame count
1809
1810 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal);
1811 int frame_serial_num = 0;
1812 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) {
1813 oop threadObj = thread->threadObj();
1814 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) {
1815 // dump thread stack trace
1816 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false);
1817 stack_trace->dump_stack_at_safepoint(-1);
1818 _stack_traces[_num_threads++] = stack_trace;
1819
1820 // write HPROF_FRAME records for this thread's stack trace
1821 int depth = stack_trace->get_stack_depth();
1822 int thread_frame_start = frame_serial_num;
1823 int extra_frames = 0;
1824 // write fake frame that makes it look like the thread, which caused OOME,
1825 // is in the OutOfMemoryError zero-parameter constructor
1826 if (thread == _oome_thread && _oome_constructor != NULL) {
1827 int oome_serial_num = _klass_map->find(_oome_constructor->method_holder());
1828 // the class serial number starts from 1
1829 assert(oome_serial_num > 0, "OutOfMemoryError class not found");
1830 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num,
1831 _oome_constructor, 0);
1832 extra_frames++;
1833 }
1834 for (int j=0; j < depth; j++) {
1835 StackFrameInfo* frame = stack_trace->stack_frame_at(j);
1836 Method* m = frame->method();
1837 int class_serial_num = _klass_map->find(m->method_holder());
1838 // the class serial number starts from 1
1839 assert(class_serial_num > 0, "class not found");
1840 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci());
1841 }
1842 depth += extra_frames;
1843
1844 // write HPROF_TRACE record for one thread
1845 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize);
1846 int stack_serial_num = _num_threads + STACK_TRACE_ID;
1847 writer()->write_u4(stack_serial_num); // stack trace serial number
1848 writer()->write_u4((u4) _num_threads); // thread serial number
1849 writer()->write_u4(depth); // frame count
1850 for (int j=1; j <= depth; j++) {
1851 writer()->write_id(thread_frame_start + j);
1852 }
1853 }
1854 }
1855 }
1856
1857 // dump the heap to given path.
1858 PRAGMA_FORMAT_NONLITERAL_IGNORED_EXTERNAL
1859 int HeapDumper::dump(const char* path) {
1860 assert(path != NULL && strlen(path) > 0, "path missing");
1861
1862 // print message in interactive case
1863 if (print_to_tty()) {
1864 tty->print_cr("Dumping heap to %s ...", path);
1865 timer()->start();
1866 }
1867
1868 // create the dump writer. If the file can be opened then bail
1869 DumpWriter writer(path);
1870 if (!writer.is_open()) {
1871 set_error(writer.error());
1872 if (print_to_tty()) {
1873 tty->print_cr("Unable to create %s: %s", path,
1874 (error() != NULL) ? error() : "reason unknown");
1875 }
1876 return -1;
1877 }
1878
1879 // generate the dump
1880 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome);
1881 if (Thread::current()->is_VM_thread()) {
1882 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint");
1883 dumper.doit();
1884 } else {
1885 VMThread::execute(&dumper);
1886 }
1887
1888 // close dump file and record any error that the writer may have encountered
1889 writer.close();
1890 set_error(writer.error());
1891
1892 // print message in interactive case
1893 if (print_to_tty()) {
1894 timer()->stop();
1895 if (error() == NULL) {
1896 char msg[256];
1897 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]",
1898 JLONG_FORMAT, timer()->seconds());
1899 PRAGMA_DIAG_PUSH
1900 PRAGMA_FORMAT_NONLITERAL_IGNORED_INTERNAL
1901 tty->print_cr(msg, writer.bytes_written());
1902 PRAGMA_DIAG_POP
1903 } else {
1904 tty->print_cr("Dump file is incomplete: %s", writer.error());
1905 }
1906 }
1907
1908 return (writer.error() == NULL) ? 0 : -1;
1909 }
1910
1911 // stop timer (if still active), and free any error string we might be holding
1912 HeapDumper::~HeapDumper() {
1913 if (timer()->is_active()) {
1914 timer()->stop();
1915 }
1916 set_error(NULL);
1917 }
1918
1919
1920 // returns the error string (resource allocated), or NULL
1921 char* HeapDumper::error_as_C_string() const {
1922 if (error() != NULL) {
1923 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1);
1924 strcpy(str, error());
1925 return str;
1926 } else {
1927 return NULL;
1928 }
1929 }
1930
1931 // set the error string
1932 void HeapDumper::set_error(char* error) {
1933 if (_error != NULL) {
1934 os::free(_error);
1935 }
1936 if (error == NULL) {
1937 _error = NULL;
1938 } else {
1939 _error = os::strdup(error);
1940 assert(_error != NULL, "allocation failure");
1941 }
1942 }
1943
1944 // Called by out-of-memory error reporting by a single Java thread
1945 // outside of a JVM safepoint
1946 void HeapDumper::dump_heap_from_oome() {
1947 HeapDumper::dump_heap(true);
1948 }
1949
1950 // Called by error reporting by a single Java thread outside of a JVM safepoint,
1951 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various
1952 // callers are strictly serialized and guaranteed not to interfere below. For more
1953 // general use, however, this method will need modification to prevent
1954 // inteference when updating the static variables base_path and dump_file_seq below.
1955 void HeapDumper::dump_heap() {
1956 HeapDumper::dump_heap(false);
1957 }
1958
1959 void HeapDumper::dump_heap(bool oome) {
1960 static char base_path[JVM_MAXPATHLEN] = {'\0'};
1961 static uint dump_file_seq = 0;
1962 char* my_path;
1963 const int max_digit_chars = 20;
1964
1965 const char* dump_file_name = "java_pid";
1966 const char* dump_file_ext = ".hprof";
1967
1968 // The dump file defaults to java_pid<pid>.hprof in the current working
1969 // directory. HeapDumpPath=<file> can be used to specify an alternative
1970 // dump file name or a directory where dump file is created.
1971 if (dump_file_seq == 0) { // first time in, we initialize base_path
1972 // Calculate potentially longest base path and check if we have enough
1973 // allocated statically.
1974 const size_t total_length =
1975 (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) +
1976 strlen(os::file_separator()) + max_digit_chars +
1977 strlen(dump_file_name) + strlen(dump_file_ext) + 1;
1978 if (total_length > sizeof(base_path)) {
1979 warning("Cannot create heap dump file. HeapDumpPath is too long.");
1980 return;
1981 }
1982
1983 bool use_default_filename = true;
1984 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') {
1985 // HeapDumpPath=<file> not specified
1986 } else {
1987 strncpy(base_path, HeapDumpPath, sizeof(base_path));
1988 // check if the path is a directory (must exist)
1989 DIR* dir = os::opendir(base_path);
1990 if (dir == NULL) {
1991 use_default_filename = false;
1992 } else {
1993 // HeapDumpPath specified a directory. We append a file separator
1994 // (if needed).
1995 os::closedir(dir);
1996 size_t fs_len = strlen(os::file_separator());
1997 if (strlen(base_path) >= fs_len) {
1998 char* end = base_path;
1999 end += (strlen(base_path) - fs_len);
2000 if (strcmp(end, os::file_separator()) != 0) {
2001 strcat(base_path, os::file_separator());
2002 }
2003 }
2004 }
2005 }
2006 // If HeapDumpPath wasn't a file name then we append the default name
2007 if (use_default_filename) {
2008 const size_t dlen = strlen(base_path); // if heap dump dir specified
2009 jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s",
2010 dump_file_name, os::current_process_id(), dump_file_ext);
2011 }
2012 const size_t len = strlen(base_path) + 1;
2013 my_path = (char*)os::malloc(len, mtInternal);
2014 if (my_path == NULL) {
2015 warning("Cannot create heap dump file. Out of system memory.");
2016 return;
2017 }
2018 strncpy(my_path, base_path, len);
2019 } else {
2020 // Append a sequence number id for dumps following the first
2021 const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0
2022 my_path = (char*)os::malloc(len, mtInternal);
2023 if (my_path == NULL) {
2024 warning("Cannot create heap dump file. Out of system memory.");
2025 return;
2026 }
2027 jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq);
2028 }
2029 dump_file_seq++; // increment seq number for next time we dump
2030
2031 HeapDumper dumper(false /* no GC before heap dump */,
2032 true /* send to tty */,
2033 oome /* pass along out-of-memory-error flag */);
2034 dumper.dump(my_path);
2035 os::free(my_path);
2036 }