Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/services/heapDumper.cpp@30f67acf635d
src/share/vm/services/heapDumper.cpp
Sat, 11 Sep 2010 08:18:31 +0200
- author
- thurka
- date
- Sat, 11 Sep 2010 08:18:31 +0200
- changeset 2130
- 30f67acf635d
- parent 1907
- c18cbe5936b8
- child 2314
- f95d63e2154a
- permissions
- -rw-r--r--
6765718: Indicate which thread throwing OOME when generating the heap dump at OOME
Summary: Emit a fake frame that makes it look like the thread is in the OutOfMemoryError zero-parameter constructor
Reviewed-by: dcubed
1 /*
2 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 # include "incls/_precompiled.incl"
26 # include "incls/_heapDumper.cpp.incl"
28 /*
29 * HPROF binary format - description copied from:
30 * src/share/demo/jvmti/hprof/hprof_io.c
31 *
32 *
33 * header "JAVA PROFILE 1.0.1" or "JAVA PROFILE 1.0.2"
34 * (0-terminated)
35 *
36 * u4 size of identifiers. Identifiers are used to represent
37 * UTF8 strings, objects, stack traces, etc. They usually
38 * have the same size as host pointers. For example, on
39 * Solaris and Win32, the size is 4.
40 * u4 high word
41 * u4 low word number of milliseconds since 0:00 GMT, 1/1/70
42 * [record]* a sequence of records.
43 *
44 *
45 * Record format:
46 *
47 * u1 a TAG denoting the type of the record
48 * u4 number of *microseconds* since the time stamp in the
49 * header. (wraps around in a little more than an hour)
50 * u4 number of bytes *remaining* in the record. Note that
51 * this number excludes the tag and the length field itself.
52 * [u1]* BODY of the record (a sequence of bytes)
53 *
54 *
55 * The following TAGs are supported:
56 *
57 * TAG BODY notes
58 *----------------------------------------------------------
59 * HPROF_UTF8 a UTF8-encoded name
60 *
61 * id name ID
62 * [u1]* UTF8 characters (no trailing zero)
63 *
64 * HPROF_LOAD_CLASS a newly loaded class
65 *
66 * u4 class serial number (> 0)
67 * id class object ID
68 * u4 stack trace serial number
69 * id class name ID
70 *
71 * HPROF_UNLOAD_CLASS an unloading class
72 *
73 * u4 class serial_number
74 *
75 * HPROF_FRAME a Java stack frame
76 *
77 * id stack frame ID
78 * id method name ID
79 * id method signature ID
80 * id source file name ID
81 * u4 class serial number
82 * i4 line number. >0: normal
83 * -1: unknown
84 * -2: compiled method
85 * -3: native method
86 *
87 * HPROF_TRACE a Java stack trace
88 *
89 * u4 stack trace serial number
90 * u4 thread serial number
91 * u4 number of frames
92 * [id]* stack frame IDs
93 *
94 *
95 * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC
96 *
97 * u2 flags 0x0001: incremental vs. complete
98 * 0x0002: sorted by allocation vs. live
99 * 0x0004: whether to force a GC
100 * u4 cutoff ratio
101 * u4 total live bytes
102 * u4 total live instances
103 * u8 total bytes allocated
104 * u8 total instances allocated
105 * u4 number of sites that follow
106 * [u1 is_array: 0: normal object
107 * 2: object array
108 * 4: boolean array
109 * 5: char array
110 * 6: float array
111 * 7: double array
112 * 8: byte array
113 * 9: short array
114 * 10: int array
115 * 11: long array
116 * u4 class serial number (may be zero during startup)
117 * u4 stack trace serial number
118 * u4 number of bytes alive
119 * u4 number of instances alive
120 * u4 number of bytes allocated
121 * u4]* number of instance allocated
122 *
123 * HPROF_START_THREAD a newly started thread.
124 *
125 * u4 thread serial number (> 0)
126 * id thread object ID
127 * u4 stack trace serial number
128 * id thread name ID
129 * id thread group name ID
130 * id thread group parent name ID
131 *
132 * HPROF_END_THREAD a terminating thread.
133 *
134 * u4 thread serial number
135 *
136 * HPROF_HEAP_SUMMARY heap summary
137 *
138 * u4 total live bytes
139 * u4 total live instances
140 * u8 total bytes allocated
141 * u8 total instances allocated
142 *
143 * HPROF_HEAP_DUMP denote a heap dump
144 *
145 * [heap dump sub-records]*
146 *
147 * There are four kinds of heap dump sub-records:
148 *
149 * u1 sub-record type
150 *
151 * HPROF_GC_ROOT_UNKNOWN unknown root
152 *
153 * id object ID
154 *
155 * HPROF_GC_ROOT_THREAD_OBJ thread object
156 *
157 * id thread object ID (may be 0 for a
158 * thread newly attached through JNI)
159 * u4 thread sequence number
160 * u4 stack trace sequence number
161 *
162 * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root
163 *
164 * id object ID
165 * id JNI global ref ID
166 *
167 * HPROF_GC_ROOT_JNI_LOCAL JNI local ref
168 *
169 * id object ID
170 * u4 thread serial number
171 * u4 frame # in stack trace (-1 for empty)
172 *
173 * HPROF_GC_ROOT_JAVA_FRAME Java stack frame
174 *
175 * id object ID
176 * u4 thread serial number
177 * u4 frame # in stack trace (-1 for empty)
178 *
179 * HPROF_GC_ROOT_NATIVE_STACK Native stack
180 *
181 * id object ID
182 * u4 thread serial number
183 *
184 * HPROF_GC_ROOT_STICKY_CLASS System class
185 *
186 * id object ID
187 *
188 * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block
189 *
190 * id object ID
191 * u4 thread serial number
192 *
193 * HPROF_GC_ROOT_MONITOR_USED Busy monitor
194 *
195 * id object ID
196 *
197 * HPROF_GC_CLASS_DUMP dump of a class object
198 *
199 * id class object ID
200 * u4 stack trace serial number
201 * id super class object ID
202 * id class loader object ID
203 * id signers object ID
204 * id protection domain object ID
205 * id reserved
206 * id reserved
207 *
208 * u4 instance size (in bytes)
209 *
210 * u2 size of constant pool
211 * [u2, constant pool index,
212 * ty, type
213 * 2: object
214 * 4: boolean
215 * 5: char
216 * 6: float
217 * 7: double
218 * 8: byte
219 * 9: short
220 * 10: int
221 * 11: long
222 * vl]* and value
223 *
224 * u2 number of static fields
225 * [id, static field name,
226 * ty, type,
227 * vl]* and value
228 *
229 * u2 number of inst. fields (not inc. super)
230 * [id, instance field name,
231 * ty]* type
232 *
233 * HPROF_GC_INSTANCE_DUMP dump of a normal object
234 *
235 * id object ID
236 * u4 stack trace serial number
237 * id class object ID
238 * u4 number of bytes that follow
239 * [vl]* instance field values (class, followed
240 * by super, super's super ...)
241 *
242 * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array
243 *
244 * id array object ID
245 * u4 stack trace serial number
246 * u4 number of elements
247 * id array class ID
248 * [id]* elements
249 *
250 * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array
251 *
252 * id array object ID
253 * u4 stack trace serial number
254 * u4 number of elements
255 * u1 element type
256 * 4: boolean array
257 * 5: char array
258 * 6: float array
259 * 7: double array
260 * 8: byte array
261 * 9: short array
262 * 10: int array
263 * 11: long array
264 * [u1]* elements
265 *
266 * HPROF_CPU_SAMPLES a set of sample traces of running threads
267 *
268 * u4 total number of samples
269 * u4 # of traces
270 * [u4 # of samples
271 * u4]* stack trace serial number
272 *
273 * HPROF_CONTROL_SETTINGS the settings of on/off switches
274 *
275 * u4 0x00000001: alloc traces on/off
276 * 0x00000002: cpu sampling on/off
277 * u2 stack trace depth
278 *
279 *
280 * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally
281 * be generated as a sequence of heap dump segments. This sequence is
282 * terminated by an end record. The additional tags allowed by format
283 * "JAVA PROFILE 1.0.2" are:
284 *
285 * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment
286 *
287 * [heap dump sub-records]*
288 * The same sub-record types allowed by HPROF_HEAP_DUMP
289 *
290 * HPROF_HEAP_DUMP_END denotes the end of a heap dump
291 *
292 */
295 // HPROF tags
297 typedef enum {
298 // top-level records
299 HPROF_UTF8 = 0x01,
300 HPROF_LOAD_CLASS = 0x02,
301 HPROF_UNLOAD_CLASS = 0x03,
302 HPROF_FRAME = 0x04,
303 HPROF_TRACE = 0x05,
304 HPROF_ALLOC_SITES = 0x06,
305 HPROF_HEAP_SUMMARY = 0x07,
306 HPROF_START_THREAD = 0x0A,
307 HPROF_END_THREAD = 0x0B,
308 HPROF_HEAP_DUMP = 0x0C,
309 HPROF_CPU_SAMPLES = 0x0D,
310 HPROF_CONTROL_SETTINGS = 0x0E,
312 // 1.0.2 record types
313 HPROF_HEAP_DUMP_SEGMENT = 0x1C,
314 HPROF_HEAP_DUMP_END = 0x2C,
316 // field types
317 HPROF_ARRAY_OBJECT = 0x01,
318 HPROF_NORMAL_OBJECT = 0x02,
319 HPROF_BOOLEAN = 0x04,
320 HPROF_CHAR = 0x05,
321 HPROF_FLOAT = 0x06,
322 HPROF_DOUBLE = 0x07,
323 HPROF_BYTE = 0x08,
324 HPROF_SHORT = 0x09,
325 HPROF_INT = 0x0A,
326 HPROF_LONG = 0x0B,
328 // data-dump sub-records
329 HPROF_GC_ROOT_UNKNOWN = 0xFF,
330 HPROF_GC_ROOT_JNI_GLOBAL = 0x01,
331 HPROF_GC_ROOT_JNI_LOCAL = 0x02,
332 HPROF_GC_ROOT_JAVA_FRAME = 0x03,
333 HPROF_GC_ROOT_NATIVE_STACK = 0x04,
334 HPROF_GC_ROOT_STICKY_CLASS = 0x05,
335 HPROF_GC_ROOT_THREAD_BLOCK = 0x06,
336 HPROF_GC_ROOT_MONITOR_USED = 0x07,
337 HPROF_GC_ROOT_THREAD_OBJ = 0x08,
338 HPROF_GC_CLASS_DUMP = 0x20,
339 HPROF_GC_INSTANCE_DUMP = 0x21,
340 HPROF_GC_OBJ_ARRAY_DUMP = 0x22,
341 HPROF_GC_PRIM_ARRAY_DUMP = 0x23
342 } hprofTag;
344 // Default stack trace ID (used for dummy HPROF_TRACE record)
345 enum {
346 STACK_TRACE_ID = 1,
347 INITIAL_CLASS_COUNT = 200
348 };
350 // Supports I/O operations on a dump file
352 class DumpWriter : public StackObj {
353 private:
354 enum {
355 io_buffer_size = 8*M
356 };
358 int _fd; // file descriptor (-1 if dump file not open)
359 jlong _bytes_written; // number of byte written to dump file
361 char* _buffer; // internal buffer
362 int _size;
363 int _pos;
365 char* _error; // error message when I/O fails
367 void set_file_descriptor(int fd) { _fd = fd; }
368 int file_descriptor() const { return _fd; }
370 char* buffer() const { return _buffer; }
371 int buffer_size() const { return _size; }
372 int position() const { return _pos; }
373 void set_position(int pos) { _pos = pos; }
375 void set_error(const char* error) { _error = (char*)os::strdup(error); }
377 // all I/O go through this function
378 void write_internal(void* s, int len);
380 public:
381 DumpWriter(const char* path);
382 ~DumpWriter();
384 void close();
385 bool is_open() const { return file_descriptor() >= 0; }
386 void flush();
388 // total number of bytes written to the disk
389 jlong bytes_written() const { return _bytes_written; }
391 // adjust the number of bytes written to disk (used to keep the count
392 // of the number of bytes written in case of rewrites)
393 void adjust_bytes_written(jlong n) { _bytes_written += n; }
395 // number of (buffered) bytes as yet unwritten to the dump file
396 jlong bytes_unwritten() const { return (jlong)position(); }
398 char* error() const { return _error; }
400 jlong current_offset();
401 void seek_to_offset(jlong pos);
403 // writer functions
404 void write_raw(void* s, int len);
405 void write_u1(u1 x) { write_raw((void*)&x, 1); }
406 void write_u2(u2 x);
407 void write_u4(u4 x);
408 void write_u8(u8 x);
409 void write_objectID(oop o);
410 void write_classID(Klass* k);
411 void write_id(u4 x);
412 };
414 DumpWriter::DumpWriter(const char* path) {
415 // try to allocate an I/O buffer of io_buffer_size. If there isn't
416 // sufficient memory then reduce size until we can allocate something.
417 _size = io_buffer_size;
418 do {
419 _buffer = (char*)os::malloc(_size);
420 if (_buffer == NULL) {
421 _size = _size >> 1;
422 }
423 } while (_buffer == NULL && _size > 0);
424 assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check");
425 _pos = 0;
426 _error = NULL;
427 _bytes_written = 0L;
428 _fd = os::create_binary_file(path, false); // don't replace existing file
430 // if the open failed we record the error
431 if (_fd < 0) {
432 _error = (char*)os::strdup(strerror(errno));
433 }
434 }
436 DumpWriter::~DumpWriter() {
437 // flush and close dump file
438 if (file_descriptor() >= 0) {
439 close();
440 }
441 if (_buffer != NULL) os::free(_buffer);
442 if (_error != NULL) os::free(_error);
443 }
445 // closes dump file (if open)
446 void DumpWriter::close() {
447 // flush and close dump file
448 if (file_descriptor() >= 0) {
449 flush();
450 ::close(file_descriptor());
451 }
452 }
454 // write directly to the file
455 void DumpWriter::write_internal(void* s, int len) {
456 if (is_open()) {
457 int n = ::write(file_descriptor(), s, len);
458 if (n > 0) {
459 _bytes_written += n;
460 }
461 if (n != len) {
462 if (n < 0) {
463 set_error(strerror(errno));
464 } else {
465 set_error("file size limit");
466 }
467 ::close(file_descriptor());
468 set_file_descriptor(-1);
469 }
470 }
471 }
473 // write raw bytes
474 void DumpWriter::write_raw(void* s, int len) {
475 if (is_open()) {
476 // flush buffer to make toom
477 if ((position()+ len) >= buffer_size()) {
478 flush();
479 }
481 // buffer not available or too big to buffer it
482 if ((buffer() == NULL) || (len >= buffer_size())) {
483 write_internal(s, len);
484 } else {
485 // Should optimize this for u1/u2/u4/u8 sizes.
486 memcpy(buffer() + position(), s, len);
487 set_position(position() + len);
488 }
489 }
490 }
492 // flush any buffered bytes to the file
493 void DumpWriter::flush() {
494 if (is_open() && position() > 0) {
495 write_internal(buffer(), position());
496 set_position(0);
497 }
498 }
501 jlong DumpWriter::current_offset() {
502 if (is_open()) {
503 // the offset is the file offset plus whatever we have buffered
504 jlong offset = os::current_file_offset(file_descriptor());
505 assert(offset >= 0, "lseek failed");
506 return offset + (jlong)position();
507 } else {
508 return (jlong)-1;
509 }
510 }
512 void DumpWriter::seek_to_offset(jlong off) {
513 assert(off >= 0, "bad offset");
515 // need to flush before seeking
516 flush();
518 // may be closed due to I/O error
519 if (is_open()) {
520 jlong n = os::seek_to_file_offset(file_descriptor(), off);
521 assert(n >= 0, "lseek failed");
522 }
523 }
525 void DumpWriter::write_u2(u2 x) {
526 u2 v;
527 Bytes::put_Java_u2((address)&v, x);
528 write_raw((void*)&v, 2);
529 }
531 void DumpWriter::write_u4(u4 x) {
532 u4 v;
533 Bytes::put_Java_u4((address)&v, x);
534 write_raw((void*)&v, 4);
535 }
537 void DumpWriter::write_u8(u8 x) {
538 u8 v;
539 Bytes::put_Java_u8((address)&v, x);
540 write_raw((void*)&v, 8);
541 }
543 void DumpWriter::write_objectID(oop o) {
544 address a = (address)((uintptr_t)o);
545 #ifdef _LP64
546 write_u8((u8)a);
547 #else
548 write_u4((u4)a);
549 #endif
550 }
552 void DumpWriter::write_id(u4 x) {
553 #ifdef _LP64
554 write_u8((u8) x);
555 #else
556 write_u4(x);
557 #endif
558 }
560 // We use java mirror as the class ID
561 void DumpWriter::write_classID(Klass* k) {
562 write_objectID(k->java_mirror());
563 }
567 // Support class with a collection of functions used when dumping the heap
569 class DumperSupport : AllStatic {
570 public:
572 // write a header of the given type
573 static void write_header(DumpWriter* writer, hprofTag tag, u4 len);
575 // returns hprof tag for the given type signature
576 static hprofTag sig2tag(symbolOop sig);
577 // returns hprof tag for the given basic type
578 static hprofTag type2tag(BasicType type);
580 // returns the size of the instance of the given class
581 static u4 instance_size(klassOop k);
583 // dump a jfloat
584 static void dump_float(DumpWriter* writer, jfloat f);
585 // dump a jdouble
586 static void dump_double(DumpWriter* writer, jdouble d);
587 // dumps the raw value of the given field
588 static void dump_field_value(DumpWriter* writer, char type, address addr);
589 // dumps static fields of the given class
590 static void dump_static_fields(DumpWriter* writer, klassOop k);
591 // dump the raw values of the instance fields of the given object
592 static void dump_instance_fields(DumpWriter* writer, oop o);
593 // dumps the definition of the instance fields for a given class
594 static void dump_instance_field_descriptors(DumpWriter* writer, klassOop k);
595 // creates HPROF_GC_INSTANCE_DUMP record for the given object
596 static void dump_instance(DumpWriter* writer, oop o);
597 // creates HPROF_GC_CLASS_DUMP record for the given class and each of its
598 // array classes
599 static void dump_class_and_array_classes(DumpWriter* writer, klassOop k);
600 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
601 // class (and each multi-dimensional array class too)
602 static void dump_basic_type_array_class(DumpWriter* writer, klassOop k);
604 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
605 static void dump_object_array(DumpWriter* writer, objArrayOop array);
606 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
607 static void dump_prim_array(DumpWriter* writer, typeArrayOop array);
608 // create HPROF_FRAME record for the given method and bci
609 static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, methodOop m, int bci);
610 };
612 // write a header of the given type
613 void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) {
614 writer->write_u1((u1)tag);
615 writer->write_u4(0); // current ticks
616 writer->write_u4(len);
617 }
619 // returns hprof tag for the given type signature
620 hprofTag DumperSupport::sig2tag(symbolOop sig) {
621 switch (sig->byte_at(0)) {
622 case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT;
623 case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT;
624 case JVM_SIGNATURE_BYTE : return HPROF_BYTE;
625 case JVM_SIGNATURE_CHAR : return HPROF_CHAR;
626 case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT;
627 case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE;
628 case JVM_SIGNATURE_INT : return HPROF_INT;
629 case JVM_SIGNATURE_LONG : return HPROF_LONG;
630 case JVM_SIGNATURE_SHORT : return HPROF_SHORT;
631 case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN;
632 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
633 }
634 }
636 hprofTag DumperSupport::type2tag(BasicType type) {
637 switch (type) {
638 case T_BYTE : return HPROF_BYTE;
639 case T_CHAR : return HPROF_CHAR;
640 case T_FLOAT : return HPROF_FLOAT;
641 case T_DOUBLE : return HPROF_DOUBLE;
642 case T_INT : return HPROF_INT;
643 case T_LONG : return HPROF_LONG;
644 case T_SHORT : return HPROF_SHORT;
645 case T_BOOLEAN : return HPROF_BOOLEAN;
646 default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE;
647 }
648 }
650 // dump a jfloat
651 void DumperSupport::dump_float(DumpWriter* writer, jfloat f) {
652 if (g_isnan(f)) {
653 writer->write_u4(0x7fc00000); // collapsing NaNs
654 } else {
655 union {
656 int i;
657 float f;
658 } u;
659 u.f = (float)f;
660 writer->write_u4((u4)u.i);
661 }
662 }
664 // dump a jdouble
665 void DumperSupport::dump_double(DumpWriter* writer, jdouble d) {
666 union {
667 jlong l;
668 double d;
669 } u;
670 if (g_isnan(d)) { // collapsing NaNs
671 u.l = (jlong)(0x7ff80000);
672 u.l = (u.l << 32);
673 } else {
674 u.d = (double)d;
675 }
676 writer->write_u8((u8)u.l);
677 }
679 // dumps the raw value of the given field
680 void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) {
681 switch (type) {
682 case JVM_SIGNATURE_CLASS :
683 case JVM_SIGNATURE_ARRAY : {
684 oop o;
685 if (UseCompressedOops) {
686 o = oopDesc::load_decode_heap_oop((narrowOop*)addr);
687 } else {
688 o = oopDesc::load_decode_heap_oop((oop*)addr);
689 }
691 // reflection and sun.misc.Unsafe classes may have a reference to a
692 // klassOop so filter it out.
693 if (o != NULL && o->is_klass()) {
694 o = NULL;
695 }
697 // FIXME: When sharing is enabled we don't emit field references to objects
698 // in shared spaces. We can remove this once we write records for the classes
699 // and strings that are shared.
700 if (o != NULL && o->is_shared()) {
701 o = NULL;
702 }
703 writer->write_objectID(o);
704 break;
705 }
706 case JVM_SIGNATURE_BYTE : {
707 jbyte* b = (jbyte*)addr;
708 writer->write_u1((u1)*b);
709 break;
710 }
711 case JVM_SIGNATURE_CHAR : {
712 jchar* c = (jchar*)addr;
713 writer->write_u2((u2)*c);
714 break;
715 }
716 case JVM_SIGNATURE_SHORT : {
717 jshort* s = (jshort*)addr;
718 writer->write_u2((u2)*s);
719 break;
720 }
721 case JVM_SIGNATURE_FLOAT : {
722 jfloat* f = (jfloat*)addr;
723 dump_float(writer, *f);
724 break;
725 }
726 case JVM_SIGNATURE_DOUBLE : {
727 jdouble* f = (jdouble*)addr;
728 dump_double(writer, *f);
729 break;
730 }
731 case JVM_SIGNATURE_INT : {
732 jint* i = (jint*)addr;
733 writer->write_u4((u4)*i);
734 break;
735 }
736 case JVM_SIGNATURE_LONG : {
737 jlong* l = (jlong*)addr;
738 writer->write_u8((u8)*l);
739 break;
740 }
741 case JVM_SIGNATURE_BOOLEAN : {
742 jboolean* b = (jboolean*)addr;
743 writer->write_u1((u1)*b);
744 break;
745 }
746 default : ShouldNotReachHere();
747 }
748 }
750 // returns the size of the instance of the given class
751 u4 DumperSupport::instance_size(klassOop k) {
752 HandleMark hm;
753 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
755 int size = 0;
757 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
758 if (!fld.access_flags().is_static()) {
759 symbolOop sig = fld.signature();
760 switch (sig->byte_at(0)) {
761 case JVM_SIGNATURE_CLASS :
762 case JVM_SIGNATURE_ARRAY : size += oopSize; break;
764 case JVM_SIGNATURE_BYTE :
765 case JVM_SIGNATURE_BOOLEAN : size += 1; break;
767 case JVM_SIGNATURE_CHAR :
768 case JVM_SIGNATURE_SHORT : size += 2; break;
770 case JVM_SIGNATURE_INT :
771 case JVM_SIGNATURE_FLOAT : size += 4; break;
773 case JVM_SIGNATURE_LONG :
774 case JVM_SIGNATURE_DOUBLE : size += 8; break;
776 default : ShouldNotReachHere();
777 }
778 }
779 }
780 return (u4)size;
781 }
783 // dumps static fields of the given class
784 void DumperSupport::dump_static_fields(DumpWriter* writer, klassOop k) {
785 HandleMark hm;
786 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
788 // pass 1 - count the static fields
789 u2 field_count = 0;
790 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
791 if (fldc.access_flags().is_static()) field_count++;
792 }
794 writer->write_u2(field_count);
796 // pass 2 - dump the field descriptors and raw values
797 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) {
798 if (fld.access_flags().is_static()) {
799 symbolOop sig = fld.signature();
801 writer->write_objectID(fld.name()); // name
802 writer->write_u1(sig2tag(sig)); // type
804 // value
805 int offset = fld.offset();
806 address addr = (address)k + offset;
808 dump_field_value(writer, sig->byte_at(0), addr);
809 }
810 }
811 }
813 // dump the raw values of the instance fields of the given object
814 void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) {
815 HandleMark hm;
816 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), o->klass());
818 for (FieldStream fld(ikh, false, false); !fld.eos(); fld.next()) {
819 if (!fld.access_flags().is_static()) {
820 symbolOop sig = fld.signature();
821 address addr = (address)o + fld.offset();
823 dump_field_value(writer, sig->byte_at(0), addr);
824 }
825 }
826 }
828 // dumps the definition of the instance fields for a given class
829 void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, klassOop k) {
830 HandleMark hm;
831 instanceKlassHandle ikh = instanceKlassHandle(Thread::current(), k);
833 // pass 1 - count the instance fields
834 u2 field_count = 0;
835 for (FieldStream fldc(ikh, true, true); !fldc.eos(); fldc.next()) {
836 if (!fldc.access_flags().is_static()) field_count++;
837 }
839 writer->write_u2(field_count);
841 // pass 2 - dump the field descriptors
842 for (FieldStream fld(ikh, true, true); !fld.eos(); fld.next()) {
843 if (!fld.access_flags().is_static()) {
844 symbolOop sig = fld.signature();
846 writer->write_objectID(fld.name()); // name
847 writer->write_u1(sig2tag(sig)); // type
848 }
849 }
850 }
852 // creates HPROF_GC_INSTANCE_DUMP record for the given object
853 void DumperSupport::dump_instance(DumpWriter* writer, oop o) {
854 klassOop k = o->klass();
856 writer->write_u1(HPROF_GC_INSTANCE_DUMP);
857 writer->write_objectID(o);
858 writer->write_u4(STACK_TRACE_ID);
860 // class ID
861 writer->write_classID(Klass::cast(k));
863 // number of bytes that follow
864 writer->write_u4(instance_size(k) );
866 // field values
867 dump_instance_fields(writer, o);
868 }
870 // creates HPROF_GC_CLASS_DUMP record for the given class and each of
871 // its array classes
872 void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, klassOop k) {
873 Klass* klass = Klass::cast(k);
874 assert(klass->oop_is_instance(), "not an instanceKlass");
875 instanceKlass* ik = (instanceKlass*)klass;
877 writer->write_u1(HPROF_GC_CLASS_DUMP);
879 // class ID
880 writer->write_classID(ik);
881 writer->write_u4(STACK_TRACE_ID);
883 // super class ID
884 klassOop java_super = ik->java_super();
885 if (java_super == NULL) {
886 writer->write_objectID(NULL);
887 } else {
888 writer->write_classID(Klass::cast(java_super));
889 }
891 writer->write_objectID(ik->class_loader());
892 writer->write_objectID(ik->signers());
893 writer->write_objectID(ik->protection_domain());
895 // reserved
896 writer->write_objectID(NULL);
897 writer->write_objectID(NULL);
899 // instance size
900 writer->write_u4(DumperSupport::instance_size(k));
902 // size of constant pool - ignored by HAT 1.1
903 writer->write_u2(0);
905 // number of static fields
906 dump_static_fields(writer, k);
908 // description of instance fields
909 dump_instance_field_descriptors(writer, k);
911 // array classes
912 k = klass->array_klass_or_null();
913 while (k != NULL) {
914 Klass* klass = Klass::cast(k);
915 assert(klass->oop_is_objArray(), "not an objArrayKlass");
917 writer->write_u1(HPROF_GC_CLASS_DUMP);
918 writer->write_classID(klass);
919 writer->write_u4(STACK_TRACE_ID);
921 // super class of array classes is java.lang.Object
922 java_super = klass->java_super();
923 assert(java_super != NULL, "checking");
924 writer->write_classID(Klass::cast(java_super));
926 writer->write_objectID(ik->class_loader());
927 writer->write_objectID(ik->signers());
928 writer->write_objectID(ik->protection_domain());
930 writer->write_objectID(NULL); // reserved
931 writer->write_objectID(NULL);
932 writer->write_u4(0); // instance size
933 writer->write_u2(0); // constant pool
934 writer->write_u2(0); // static fields
935 writer->write_u2(0); // instance fields
937 // get the array class for the next rank
938 k = klass->array_klass_or_null();
939 }
940 }
942 // creates HPROF_GC_CLASS_DUMP record for a given primitive array
943 // class (and each multi-dimensional array class too)
944 void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, klassOop k) {
945 // array classes
946 while (k != NULL) {
947 Klass* klass = Klass::cast(k);
949 writer->write_u1(HPROF_GC_CLASS_DUMP);
950 writer->write_classID(klass);
951 writer->write_u4(STACK_TRACE_ID);
953 // super class of array classes is java.lang.Object
954 klassOop java_super = klass->java_super();
955 assert(java_super != NULL, "checking");
956 writer->write_classID(Klass::cast(java_super));
958 writer->write_objectID(NULL); // loader
959 writer->write_objectID(NULL); // signers
960 writer->write_objectID(NULL); // protection domain
962 writer->write_objectID(NULL); // reserved
963 writer->write_objectID(NULL);
964 writer->write_u4(0); // instance size
965 writer->write_u2(0); // constant pool
966 writer->write_u2(0); // static fields
967 writer->write_u2(0); // instance fields
969 // get the array class for the next rank
970 k = klass->array_klass_or_null();
971 }
972 }
974 // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array
975 void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) {
977 // filter this
978 if (array->klass() == Universe::systemObjArrayKlassObj()) return;
980 writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP);
981 writer->write_objectID(array);
982 writer->write_u4(STACK_TRACE_ID);
983 writer->write_u4((u4)array->length());
985 // array class ID
986 writer->write_classID(Klass::cast(array->klass()));
988 // [id]* elements
989 for (int index=0; index<array->length(); index++) {
990 oop o = array->obj_at(index);
991 writer->write_objectID(o);
992 }
993 }
995 #define WRITE_ARRAY(Array, Type, Size) \
996 for (int i=0; i<Array->length(); i++) { writer->write_##Size((Size)array->Type##_at(i)); }
999 // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array
1000 void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) {
1001 BasicType type = typeArrayKlass::cast(array->klass())->element_type();
1003 writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP);
1004 writer->write_objectID(array);
1005 writer->write_u4(STACK_TRACE_ID);
1006 writer->write_u4((u4)array->length());
1007 writer->write_u1(type2tag(type));
1009 // nothing to copy
1010 if (array->length() == 0) {
1011 return;
1012 }
1014 // If the byte ordering is big endian then we can copy most types directly
1015 int length_in_bytes = array->length() * type2aelembytes(type);
1016 assert(length_in_bytes > 0, "nothing to copy");
1018 switch (type) {
1019 case T_INT : {
1020 if (Bytes::is_Java_byte_ordering_different()) {
1021 WRITE_ARRAY(array, int, u4);
1022 } else {
1023 writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes);
1024 }
1025 break;
1026 }
1027 case T_BYTE : {
1028 writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes);
1029 break;
1030 }
1031 case T_CHAR : {
1032 if (Bytes::is_Java_byte_ordering_different()) {
1033 WRITE_ARRAY(array, char, u2);
1034 } else {
1035 writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes);
1036 }
1037 break;
1038 }
1039 case T_SHORT : {
1040 if (Bytes::is_Java_byte_ordering_different()) {
1041 WRITE_ARRAY(array, short, u2);
1042 } else {
1043 writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes);
1044 }
1045 break;
1046 }
1047 case T_BOOLEAN : {
1048 if (Bytes::is_Java_byte_ordering_different()) {
1049 WRITE_ARRAY(array, bool, u1);
1050 } else {
1051 writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes);
1052 }
1053 break;
1054 }
1055 case T_LONG : {
1056 if (Bytes::is_Java_byte_ordering_different()) {
1057 WRITE_ARRAY(array, long, u8);
1058 } else {
1059 writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes);
1060 }
1061 break;
1062 }
1064 // handle float/doubles in a special value to ensure than NaNs are
1065 // written correctly. TO DO: Check if we can avoid this on processors that
1066 // use IEEE 754.
1068 case T_FLOAT : {
1069 for (int i=0; i<array->length(); i++) {
1070 dump_float( writer, array->float_at(i) );
1071 }
1072 break;
1073 }
1074 case T_DOUBLE : {
1075 for (int i=0; i<array->length(); i++) {
1076 dump_double( writer, array->double_at(i) );
1077 }
1078 break;
1079 }
1080 default : ShouldNotReachHere();
1081 }
1082 }
1084 // create a HPROF_FRAME record of the given methodOop and bci
1085 void DumperSupport::dump_stack_frame(DumpWriter* writer,
1086 int frame_serial_num,
1087 int class_serial_num,
1088 methodOop m,
1089 int bci) {
1090 int line_number;
1091 if (m->is_native()) {
1092 line_number = -3; // native frame
1093 } else {
1094 line_number = m->line_number_from_bci(bci);
1095 }
1097 write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4));
1098 writer->write_id(frame_serial_num); // frame serial number
1099 writer->write_objectID(m->name()); // method's name
1100 writer->write_objectID(m->signature()); // method's signature
1102 assert(Klass::cast(m->method_holder())->oop_is_instance(), "not instanceKlass");
1103 writer->write_objectID(instanceKlass::cast(m->method_holder())->source_file_name()); // source file name
1104 writer->write_u4(class_serial_num); // class serial number
1105 writer->write_u4((u4) line_number); // line number
1106 }
1108 // Support class used to generate HPROF_UTF8 records from the entries in the
1109 // SymbolTable.
1111 class SymbolTableDumper : public OopClosure {
1112 private:
1113 DumpWriter* _writer;
1114 DumpWriter* writer() const { return _writer; }
1115 public:
1116 SymbolTableDumper(DumpWriter* writer) { _writer = writer; }
1117 void do_oop(oop* obj_p);
1118 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1119 };
1121 void SymbolTableDumper::do_oop(oop* obj_p) {
1122 ResourceMark rm;
1123 symbolOop sym = (symbolOop)*obj_p;
1125 int len = sym->utf8_length();
1126 if (len > 0) {
1127 char* s = sym->as_utf8();
1128 DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len);
1129 writer()->write_objectID(sym);
1130 writer()->write_raw(s, len);
1131 }
1132 }
1135 // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records
1137 class JNILocalsDumper : public OopClosure {
1138 private:
1139 DumpWriter* _writer;
1140 u4 _thread_serial_num;
1141 int _frame_num;
1142 DumpWriter* writer() const { return _writer; }
1143 public:
1144 JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) {
1145 _writer = writer;
1146 _thread_serial_num = thread_serial_num;
1147 _frame_num = -1; // default - empty stack
1148 }
1149 void set_frame_number(int n) { _frame_num = n; }
1150 void do_oop(oop* obj_p);
1151 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1152 };
1155 void JNILocalsDumper::do_oop(oop* obj_p) {
1156 // ignore null or deleted handles
1157 oop o = *obj_p;
1158 if (o != NULL && o != JNIHandles::deleted_handle()) {
1159 writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL);
1160 writer()->write_objectID(o);
1161 writer()->write_u4(_thread_serial_num);
1162 writer()->write_u4((u4)_frame_num);
1163 }
1164 }
1167 // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records
1169 class JNIGlobalsDumper : public OopClosure {
1170 private:
1171 DumpWriter* _writer;
1172 DumpWriter* writer() const { return _writer; }
1174 public:
1175 JNIGlobalsDumper(DumpWriter* writer) {
1176 _writer = writer;
1177 }
1178 void do_oop(oop* obj_p);
1179 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1180 };
1182 void JNIGlobalsDumper::do_oop(oop* obj_p) {
1183 oop o = *obj_p;
1185 // ignore these
1186 if (o == NULL || o == JNIHandles::deleted_handle()) return;
1188 // we ignore global ref to symbols and other internal objects
1189 if (o->is_instance() || o->is_objArray() || o->is_typeArray()) {
1190 writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL);
1191 writer()->write_objectID(o);
1192 writer()->write_objectID((oopDesc*)obj_p); // global ref ID
1193 }
1194 };
1197 // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records
1199 class MonitorUsedDumper : public OopClosure {
1200 private:
1201 DumpWriter* _writer;
1202 DumpWriter* writer() const { return _writer; }
1203 public:
1204 MonitorUsedDumper(DumpWriter* writer) {
1205 _writer = writer;
1206 }
1207 void do_oop(oop* obj_p) {
1208 writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED);
1209 writer()->write_objectID(*obj_p);
1210 }
1211 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1212 };
1215 // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records
1217 class StickyClassDumper : public OopClosure {
1218 private:
1219 DumpWriter* _writer;
1220 DumpWriter* writer() const { return _writer; }
1221 public:
1222 StickyClassDumper(DumpWriter* writer) {
1223 _writer = writer;
1224 }
1225 void do_oop(oop* obj_p);
1226 void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); }
1227 };
1229 void StickyClassDumper::do_oop(oop* obj_p) {
1230 if (*obj_p != NULL) {
1231 oop o = *obj_p;
1232 if (o->is_klass()) {
1233 klassOop k = klassOop(o);
1234 if (Klass::cast(k)->oop_is_instance()) {
1235 instanceKlass* ik = instanceKlass::cast(k);
1236 writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS);
1237 writer()->write_classID(ik);
1238 }
1239 }
1240 }
1241 }
1244 class VM_HeapDumper;
1246 // Support class using when iterating over the heap.
1248 class HeapObjectDumper : public ObjectClosure {
1249 private:
1250 VM_HeapDumper* _dumper;
1251 DumpWriter* _writer;
1253 VM_HeapDumper* dumper() { return _dumper; }
1254 DumpWriter* writer() { return _writer; }
1256 // used to indicate that a record has been writen
1257 void mark_end_of_record();
1259 public:
1260 HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) {
1261 _dumper = dumper;
1262 _writer = writer;
1263 }
1265 // called for each object in the heap
1266 void do_object(oop o);
1267 };
1269 void HeapObjectDumper::do_object(oop o) {
1270 // hide the sentinel for deleted handles
1271 if (o == JNIHandles::deleted_handle()) return;
1273 // ignore KlassKlass objects
1274 if (o->is_klass()) return;
1276 // skip classes as these emitted as HPROF_GC_CLASS_DUMP records
1277 if (o->klass() == SystemDictionary::Class_klass()) {
1278 if (!java_lang_Class::is_primitive(o)) {
1279 return;
1280 }
1281 }
1283 // create a HPROF_GC_INSTANCE record for each object
1284 if (o->is_instance()) {
1285 DumperSupport::dump_instance(writer(), o);
1286 mark_end_of_record();
1287 } else {
1288 // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array
1289 if (o->is_objArray()) {
1290 DumperSupport::dump_object_array(writer(), objArrayOop(o));
1291 mark_end_of_record();
1292 } else {
1293 // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array
1294 if (o->is_typeArray()) {
1295 DumperSupport::dump_prim_array(writer(), typeArrayOop(o));
1296 mark_end_of_record();
1297 }
1298 }
1299 }
1300 }
1302 // The VM operation that performs the heap dump
1303 class VM_HeapDumper : public VM_GC_Operation {
1304 private:
1305 static VM_HeapDumper* _global_dumper;
1306 static DumpWriter* _global_writer;
1307 DumpWriter* _local_writer;
1308 JavaThread* _oome_thread;
1309 methodOop _oome_constructor;
1310 bool _gc_before_heap_dump;
1311 bool _is_segmented_dump;
1312 jlong _dump_start;
1313 GrowableArray<Klass*>* _klass_map;
1314 ThreadStackTrace** _stack_traces;
1315 int _num_threads;
1317 // accessors and setters
1318 static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; }
1319 static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; }
1320 void set_global_dumper() {
1321 assert(_global_dumper == NULL, "Error");
1322 _global_dumper = this;
1323 }
1324 void set_global_writer() {
1325 assert(_global_writer == NULL, "Error");
1326 _global_writer = _local_writer;
1327 }
1328 void clear_global_dumper() { _global_dumper = NULL; }
1329 void clear_global_writer() { _global_writer = NULL; }
1331 bool is_segmented_dump() const { return _is_segmented_dump; }
1332 void set_segmented_dump() { _is_segmented_dump = true; }
1333 jlong dump_start() const { return _dump_start; }
1334 void set_dump_start(jlong pos);
1336 bool skip_operation() const;
1338 // writes a HPROF_LOAD_CLASS record
1339 static void do_load_class(klassOop k);
1341 // writes a HPROF_GC_CLASS_DUMP record for the given class
1342 // (and each array class too)
1343 static void do_class_dump(klassOop k);
1345 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1346 // array (and each multi-dimensional array too)
1347 static void do_basic_type_array_class_dump(klassOop k);
1349 // HPROF_GC_ROOT_THREAD_OBJ records
1350 int do_thread(JavaThread* thread, u4 thread_serial_num);
1351 void do_threads();
1353 void add_class_serial_number(Klass* k, int serial_num) {
1354 _klass_map->at_put_grow(serial_num, k);
1355 }
1357 // HPROF_TRACE and HPROF_FRAME records
1358 void dump_stack_traces();
1360 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1361 void write_dump_header();
1363 // fixes up the length of the current dump record
1364 void write_current_dump_record_length();
1366 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1367 // record in the case of a segmented heap dump)
1368 void end_of_dump();
1370 public:
1371 VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) :
1372 VM_GC_Operation(0 /* total collections, dummy, ignored */,
1373 0 /* total full collections, dummy, ignored */,
1374 gc_before_heap_dump) {
1375 _local_writer = writer;
1376 _gc_before_heap_dump = gc_before_heap_dump;
1377 _is_segmented_dump = false;
1378 _dump_start = (jlong)-1;
1379 _klass_map = new (ResourceObj::C_HEAP) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true);
1380 _stack_traces = NULL;
1381 _num_threads = 0;
1382 if (oome) {
1383 assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread");
1384 // get OutOfMemoryError zero-parameter constructor
1385 instanceKlass* oome_ik = instanceKlass::cast(SystemDictionary::OutOfMemoryError_klass());
1386 _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(),
1387 vmSymbols::void_method_signature());
1388 // get thread throwing OOME when generating the heap dump at OOME
1389 _oome_thread = JavaThread::current();
1390 } else {
1391 _oome_thread = NULL;
1392 _oome_constructor = NULL;
1393 }
1394 }
1395 ~VM_HeapDumper() {
1396 if (_stack_traces != NULL) {
1397 for (int i=0; i < _num_threads; i++) {
1398 delete _stack_traces[i];
1399 }
1400 FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces);
1401 }
1402 delete _klass_map;
1403 }
1405 VMOp_Type type() const { return VMOp_HeapDumper; }
1406 // used to mark sub-record boundary
1407 void check_segment_length();
1408 void doit();
1409 };
1411 VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL;
1412 DumpWriter* VM_HeapDumper::_global_writer = NULL;
1414 bool VM_HeapDumper::skip_operation() const {
1415 return false;
1416 }
1418 // sets the dump starting position
1419 void VM_HeapDumper::set_dump_start(jlong pos) {
1420 _dump_start = pos;
1421 }
1423 // writes a HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT record
1424 void VM_HeapDumper::write_dump_header() {
1425 if (writer()->is_open()) {
1426 if (is_segmented_dump()) {
1427 writer()->write_u1(HPROF_HEAP_DUMP_SEGMENT);
1428 } else {
1429 writer()->write_u1(HPROF_HEAP_DUMP);
1430 }
1431 writer()->write_u4(0); // current ticks
1433 // record the starting position for the dump (its length will be fixed up later)
1434 set_dump_start(writer()->current_offset());
1435 writer()->write_u4(0);
1436 }
1437 }
1439 // fixes up the length of the current dump record
1440 void VM_HeapDumper::write_current_dump_record_length() {
1441 if (writer()->is_open()) {
1442 assert(dump_start() >= 0, "no dump start recorded");
1444 // calculate the size of the dump record
1445 jlong dump_end = writer()->current_offset();
1446 jlong dump_len = (dump_end - dump_start() - 4);
1448 // record length must fit in a u4
1449 if (dump_len > (jlong)(4L*(jlong)G)) {
1450 warning("record is too large");
1451 }
1453 // seek to the dump start and fix-up the length
1454 writer()->seek_to_offset(dump_start());
1455 writer()->write_u4((u4)dump_len);
1457 // adjust the total size written to keep the bytes written correct.
1458 writer()->adjust_bytes_written(-((long) sizeof(u4)));
1460 // seek to dump end so we can continue
1461 writer()->seek_to_offset(dump_end);
1463 // no current dump record
1464 set_dump_start((jlong)-1);
1465 }
1466 }
1468 // used on a sub-record boundary to check if we need to start a
1469 // new segment.
1470 void VM_HeapDumper::check_segment_length() {
1471 if (writer()->is_open()) {
1472 if (is_segmented_dump()) {
1473 // don't use current_offset that would be too expensive on a per record basis
1474 jlong dump_end = writer()->bytes_written() + writer()->bytes_unwritten();
1475 assert(dump_end == writer()->current_offset(), "checking");
1476 jlong dump_len = (dump_end - dump_start() - 4);
1477 assert(dump_len >= 0 && dump_len <= max_juint, "bad dump length");
1479 if (dump_len > (jlong)HeapDumpSegmentSize) {
1480 write_current_dump_record_length();
1481 write_dump_header();
1482 }
1483 }
1484 }
1485 }
1487 // fixes up the current dump record )and writes HPROF_HEAP_DUMP_END
1488 // record in the case of a segmented heap dump)
1489 void VM_HeapDumper::end_of_dump() {
1490 if (writer()->is_open()) {
1491 write_current_dump_record_length();
1493 // for segmented dump we write the end record
1494 if (is_segmented_dump()) {
1495 writer()->write_u1(HPROF_HEAP_DUMP_END);
1496 writer()->write_u4(0);
1497 writer()->write_u4(0);
1498 }
1499 }
1500 }
1502 // marks sub-record boundary
1503 void HeapObjectDumper::mark_end_of_record() {
1504 dumper()->check_segment_length();
1505 }
1507 // writes a HPROF_LOAD_CLASS record for the class (and each of its
1508 // array classes)
1509 void VM_HeapDumper::do_load_class(klassOop k) {
1510 static u4 class_serial_num = 0;
1512 // len of HPROF_LOAD_CLASS record
1513 u4 remaining = 2*oopSize + 2*sizeof(u4);
1515 // write a HPROF_LOAD_CLASS for the class and each array class
1516 do {
1517 DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining);
1519 // class serial number is just a number
1520 writer()->write_u4(++class_serial_num);
1522 // class ID
1523 Klass* klass = Klass::cast(k);
1524 writer()->write_classID(klass);
1526 // add the klassOop and class serial number pair
1527 dumper()->add_class_serial_number(klass, class_serial_num);
1529 writer()->write_u4(STACK_TRACE_ID);
1531 // class name ID
1532 symbolOop name = klass->name();
1533 writer()->write_objectID(name);
1535 // write a LOAD_CLASS record for the array type (if it exists)
1536 k = klass->array_klass_or_null();
1537 } while (k != NULL);
1538 }
1540 // writes a HPROF_GC_CLASS_DUMP record for the given class
1541 void VM_HeapDumper::do_class_dump(klassOop k) {
1542 DumperSupport::dump_class_and_array_classes(writer(), k);
1543 }
1545 // writes a HPROF_GC_CLASS_DUMP records for a given basic type
1546 // array (and each multi-dimensional array too)
1547 void VM_HeapDumper::do_basic_type_array_class_dump(klassOop k) {
1548 DumperSupport::dump_basic_type_array_class(writer(), k);
1549 }
1551 // Walk the stack of the given thread.
1552 // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local
1553 // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local
1554 //
1555 // It returns the number of Java frames in this thread stack
1556 int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) {
1557 JNILocalsDumper blk(writer(), thread_serial_num);
1559 oop threadObj = java_thread->threadObj();
1560 assert(threadObj != NULL, "sanity check");
1562 int stack_depth = 0;
1563 if (java_thread->has_last_Java_frame()) {
1565 // vframes are resource allocated
1566 Thread* current_thread = Thread::current();
1567 ResourceMark rm(current_thread);
1568 HandleMark hm(current_thread);
1570 RegisterMap reg_map(java_thread);
1571 frame f = java_thread->last_frame();
1572 vframe* vf = vframe::new_vframe(&f, ®_map, java_thread);
1573 frame* last_entry_frame = NULL;
1574 int extra_frames = 0;
1576 if (java_thread == _oome_thread && _oome_constructor != NULL) {
1577 extra_frames++;
1578 }
1579 while (vf != NULL) {
1580 blk.set_frame_number(stack_depth);
1581 if (vf->is_java_frame()) {
1583 // java frame (interpreted, compiled, ...)
1584 javaVFrame *jvf = javaVFrame::cast(vf);
1585 if (!(jvf->method()->is_native())) {
1586 StackValueCollection* locals = jvf->locals();
1587 for (int slot=0; slot<locals->size(); slot++) {
1588 if (locals->at(slot)->type() == T_OBJECT) {
1589 oop o = locals->obj_at(slot)();
1591 if (o != NULL) {
1592 writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME);
1593 writer()->write_objectID(o);
1594 writer()->write_u4(thread_serial_num);
1595 writer()->write_u4((u4) (stack_depth + extra_frames));
1596 }
1597 }
1598 }
1599 } else {
1600 // native frame
1601 if (stack_depth == 0) {
1602 // JNI locals for the top frame.
1603 java_thread->active_handles()->oops_do(&blk);
1604 } else {
1605 if (last_entry_frame != NULL) {
1606 // JNI locals for the entry frame
1607 assert(last_entry_frame->is_entry_frame(), "checking");
1608 last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk);
1609 }
1610 }
1611 }
1612 // increment only for Java frames
1613 stack_depth++;
1614 last_entry_frame = NULL;
1616 } else {
1617 // externalVFrame - if it's an entry frame then report any JNI locals
1618 // as roots when we find the corresponding native javaVFrame
1619 frame* fr = vf->frame_pointer();
1620 assert(fr != NULL, "sanity check");
1621 if (fr->is_entry_frame()) {
1622 last_entry_frame = fr;
1623 }
1624 }
1625 vf = vf->sender();
1626 }
1627 } else {
1628 // no last java frame but there may be JNI locals
1629 java_thread->active_handles()->oops_do(&blk);
1630 }
1631 return stack_depth;
1632 }
1635 // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk
1636 // the stack so that locals and JNI locals are dumped.
1637 void VM_HeapDumper::do_threads() {
1638 for (int i=0; i < _num_threads; i++) {
1639 JavaThread* thread = _stack_traces[i]->thread();
1640 oop threadObj = thread->threadObj();
1641 u4 thread_serial_num = i+1;
1642 u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID;
1643 writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ);
1644 writer()->write_objectID(threadObj);
1645 writer()->write_u4(thread_serial_num); // thread number
1646 writer()->write_u4(stack_serial_num); // stack trace serial number
1647 int num_frames = do_thread(thread, thread_serial_num);
1648 assert(num_frames == _stack_traces[i]->get_stack_depth(),
1649 "total number of Java frames not matched");
1650 }
1651 }
1654 // The VM operation that dumps the heap. The dump consists of the following
1655 // records:
1656 //
1657 // HPROF_HEADER
1658 // [HPROF_UTF8]*
1659 // [HPROF_LOAD_CLASS]*
1660 // [[HPROF_FRAME]*|HPROF_TRACE]*
1661 // [HPROF_GC_CLASS_DUMP]*
1662 // HPROF_HEAP_DUMP
1663 //
1664 // The HPROF_TRACE records represent the stack traces where the heap dump
1665 // is generated and a "dummy trace" record which does not include
1666 // any frames. The dummy trace record is used to be referenced as the
1667 // unknown object alloc site.
1668 //
1669 // The HPROF_HEAP_DUMP record has a length following by sub-records. To allow
1670 // the heap dump be generated in a single pass we remember the position of
1671 // the dump length and fix it up after all sub-records have been written.
1672 // To generate the sub-records we iterate over the heap, writing
1673 // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP
1674 // records as we go. Once that is done we write records for some of the GC
1675 // roots.
1677 void VM_HeapDumper::doit() {
1679 HandleMark hm;
1680 CollectedHeap* ch = Universe::heap();
1681 if (_gc_before_heap_dump) {
1682 ch->collect_as_vm_thread(GCCause::_heap_dump);
1683 } else {
1684 // make the heap parsable (no need to retire TLABs)
1685 ch->ensure_parsability(false);
1686 }
1688 // At this point we should be the only dumper active, so
1689 // the following should be safe.
1690 set_global_dumper();
1691 set_global_writer();
1693 // Write the file header - use 1.0.2 for large heaps, otherwise 1.0.1
1694 size_t used = ch->used();
1695 const char* header;
1696 if (used > (size_t)SegmentedHeapDumpThreshold) {
1697 set_segmented_dump();
1698 header = "JAVA PROFILE 1.0.2";
1699 } else {
1700 header = "JAVA PROFILE 1.0.1";
1701 }
1703 // header is few bytes long - no chance to overflow int
1704 writer()->write_raw((void*)header, (int)strlen(header));
1705 writer()->write_u1(0); // terminator
1706 writer()->write_u4(oopSize);
1707 writer()->write_u8(os::javaTimeMillis());
1709 // HPROF_UTF8 records
1710 SymbolTableDumper sym_dumper(writer());
1711 SymbolTable::oops_do(&sym_dumper);
1713 // write HPROF_LOAD_CLASS records
1714 SystemDictionary::classes_do(&do_load_class);
1715 Universe::basic_type_classes_do(&do_load_class);
1717 // write HPROF_FRAME and HPROF_TRACE records
1718 // this must be called after _klass_map is built when iterating the classes above.
1719 dump_stack_traces();
1721 // write HPROF_HEAP_DUMP or HPROF_HEAP_DUMP_SEGMENT
1722 write_dump_header();
1724 // Writes HPROF_GC_CLASS_DUMP records
1725 SystemDictionary::classes_do(&do_class_dump);
1726 Universe::basic_type_classes_do(&do_basic_type_array_class_dump);
1727 check_segment_length();
1729 // writes HPROF_GC_INSTANCE_DUMP records.
1730 // After each sub-record is written check_segment_length will be invoked. When
1731 // generated a segmented heap dump this allows us to check if the current
1732 // segment exceeds a threshold and if so, then a new segment is started.
1733 // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk
1734 // of the heap dump.
1735 HeapObjectDumper obj_dumper(this, writer());
1736 Universe::heap()->safe_object_iterate(&obj_dumper);
1738 // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals
1739 do_threads();
1740 check_segment_length();
1742 // HPROF_GC_ROOT_MONITOR_USED
1743 MonitorUsedDumper mon_dumper(writer());
1744 ObjectSynchronizer::oops_do(&mon_dumper);
1745 check_segment_length();
1747 // HPROF_GC_ROOT_JNI_GLOBAL
1748 JNIGlobalsDumper jni_dumper(writer());
1749 JNIHandles::oops_do(&jni_dumper);
1750 check_segment_length();
1752 // HPROF_GC_ROOT_STICKY_CLASS
1753 StickyClassDumper class_dumper(writer());
1754 SystemDictionary::always_strong_oops_do(&class_dumper);
1756 // fixes up the length of the dump record. In the case of a segmented
1757 // heap then the HPROF_HEAP_DUMP_END record is also written.
1758 end_of_dump();
1760 // Now we clear the global variables, so that a future dumper might run.
1761 clear_global_dumper();
1762 clear_global_writer();
1763 }
1765 void VM_HeapDumper::dump_stack_traces() {
1766 // write a HPROF_TRACE record without any frames to be referenced as object alloc sites
1767 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4));
1768 writer()->write_u4((u4) STACK_TRACE_ID);
1769 writer()->write_u4(0); // thread number
1770 writer()->write_u4(0); // frame count
1772 _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads());
1773 int frame_serial_num = 0;
1774 for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) {
1775 oop threadObj = thread->threadObj();
1776 if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) {
1777 // dump thread stack trace
1778 ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false);
1779 stack_trace->dump_stack_at_safepoint(-1);
1780 _stack_traces[_num_threads++] = stack_trace;
1782 // write HPROF_FRAME records for this thread's stack trace
1783 int depth = stack_trace->get_stack_depth();
1784 int thread_frame_start = frame_serial_num;
1785 int extra_frames = 0;
1786 // write fake frame that makes it look like the thread, which caused OOME,
1787 // is in the OutOfMemoryError zero-parameter constructor
1788 if (thread == _oome_thread && _oome_constructor != NULL) {
1789 int oome_serial_num = _klass_map->find(Klass::cast(_oome_constructor->method_holder()));
1790 // the class serial number starts from 1
1791 assert(oome_serial_num > 0, "OutOfMemoryError class not found");
1792 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num,
1793 _oome_constructor, 0);
1794 extra_frames++;
1795 }
1796 for (int j=0; j < depth; j++) {
1797 StackFrameInfo* frame = stack_trace->stack_frame_at(j);
1798 methodOop m = frame->method();
1799 int class_serial_num = _klass_map->find(Klass::cast(m->method_holder()));
1800 // the class serial number starts from 1
1801 assert(class_serial_num > 0, "class not found");
1802 DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci());
1803 }
1804 depth += extra_frames;
1806 // write HPROF_TRACE record for one thread
1807 DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize);
1808 int stack_serial_num = _num_threads + STACK_TRACE_ID;
1809 writer()->write_u4(stack_serial_num); // stack trace serial number
1810 writer()->write_u4((u4) _num_threads); // thread serial number
1811 writer()->write_u4(depth); // frame count
1812 for (int j=1; j <= depth; j++) {
1813 writer()->write_id(thread_frame_start + j);
1814 }
1815 }
1816 }
1817 }
1819 // dump the heap to given path.
1820 int HeapDumper::dump(const char* path) {
1821 assert(path != NULL && strlen(path) > 0, "path missing");
1823 // print message in interactive case
1824 if (print_to_tty()) {
1825 tty->print_cr("Dumping heap to %s ...", path);
1826 timer()->start();
1827 }
1829 // create the dump writer. If the file can be opened then bail
1830 DumpWriter writer(path);
1831 if (!writer.is_open()) {
1832 set_error(writer.error());
1833 if (print_to_tty()) {
1834 tty->print_cr("Unable to create %s: %s", path,
1835 (error() != NULL) ? error() : "reason unknown");
1836 }
1837 return -1;
1838 }
1840 // generate the dump
1841 VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome);
1842 if (Thread::current()->is_VM_thread()) {
1843 assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint");
1844 dumper.doit();
1845 } else {
1846 VMThread::execute(&dumper);
1847 }
1849 // close dump file and record any error that the writer may have encountered
1850 writer.close();
1851 set_error(writer.error());
1853 // print message in interactive case
1854 if (print_to_tty()) {
1855 timer()->stop();
1856 if (error() == NULL) {
1857 char msg[256];
1858 sprintf(msg, "Heap dump file created [%s bytes in %3.3f secs]",
1859 os::jlong_format_specifier(), timer()->seconds());
1860 tty->print_cr(msg, writer.bytes_written());
1861 } else {
1862 tty->print_cr("Dump file is incomplete: %s", writer.error());
1863 }
1864 }
1866 return (writer.error() == NULL) ? 0 : -1;
1867 }
1869 // stop timer (if still active), and free any error string we might be holding
1870 HeapDumper::~HeapDumper() {
1871 if (timer()->is_active()) {
1872 timer()->stop();
1873 }
1874 set_error(NULL);
1875 }
1878 // returns the error string (resource allocated), or NULL
1879 char* HeapDumper::error_as_C_string() const {
1880 if (error() != NULL) {
1881 char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1);
1882 strcpy(str, error());
1883 return str;
1884 } else {
1885 return NULL;
1886 }
1887 }
1889 // set the error string
1890 void HeapDumper::set_error(char* error) {
1891 if (_error != NULL) {
1892 os::free(_error);
1893 }
1894 if (error == NULL) {
1895 _error = NULL;
1896 } else {
1897 _error = os::strdup(error);
1898 assert(_error != NULL, "allocation failure");
1899 }
1900 }
1902 // Called by out-of-memory error reporting by a single Java thread
1903 // outside of a JVM safepoint
1904 void HeapDumper::dump_heap_from_oome() {
1905 HeapDumper::dump_heap(true);
1906 }
1908 // Called by error reporting by a single Java thread outside of a JVM safepoint,
1909 // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various
1910 // callers are strictly serialized and guaranteed not to interfere below. For more
1911 // general use, however, this method will need modification to prevent
1912 // inteference when updating the static variables base_path and dump_file_seq below.
1913 void HeapDumper::dump_heap() {
1914 HeapDumper::dump_heap(false);
1915 }
1917 void HeapDumper::dump_heap(bool oome) {
1918 static char base_path[JVM_MAXPATHLEN] = {'\0'};
1919 static uint dump_file_seq = 0;
1920 char my_path[JVM_MAXPATHLEN] = {'\0'};
1922 // The dump file defaults to java_pid<pid>.hprof in the current working
1923 // directory. HeapDumpPath=<file> can be used to specify an alternative
1924 // dump file name or a directory where dump file is created.
1925 if (dump_file_seq == 0) { // first time in, we initialize base_path
1926 bool use_default_filename = true;
1927 if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') {
1928 // HeapDumpPath=<file> not specified
1929 } else {
1930 assert(strlen(HeapDumpPath) < sizeof(base_path), "HeapDumpPath too long");
1931 strcpy(base_path, HeapDumpPath);
1932 // check if the path is a directory (must exist)
1933 DIR* dir = os::opendir(base_path);
1934 if (dir == NULL) {
1935 use_default_filename = false;
1936 } else {
1937 // HeapDumpPath specified a directory. We append a file separator
1938 // (if needed).
1939 os::closedir(dir);
1940 size_t fs_len = strlen(os::file_separator());
1941 if (strlen(base_path) >= fs_len) {
1942 char* end = base_path;
1943 end += (strlen(base_path) - fs_len);
1944 if (strcmp(end, os::file_separator()) != 0) {
1945 assert(strlen(base_path) + strlen(os::file_separator()) < sizeof(base_path),
1946 "HeapDumpPath too long");
1947 strcat(base_path, os::file_separator());
1948 }
1949 }
1950 }
1951 }
1952 // If HeapDumpPath wasn't a file name then we append the default name
1953 if (use_default_filename) {
1954 char fn[32];
1955 sprintf(fn, "java_pid%d", os::current_process_id());
1956 assert(strlen(base_path) + strlen(fn) + strlen(".hprof") < sizeof(base_path), "HeapDumpPath too long");
1957 strcat(base_path, fn);
1958 strcat(base_path, ".hprof");
1959 }
1960 assert(strlen(base_path) < sizeof(my_path), "Buffer too small");
1961 strcpy(my_path, base_path);
1962 } else {
1963 // Append a sequence number id for dumps following the first
1964 char fn[33];
1965 sprintf(fn, ".%d", dump_file_seq);
1966 assert(strlen(base_path) + strlen(fn) < sizeof(my_path), "HeapDumpPath too long");
1967 strcpy(my_path, base_path);
1968 strcat(my_path, fn);
1969 }
1970 dump_file_seq++; // increment seq number for next time we dump
1972 HeapDumper dumper(false /* no GC before heap dump */,
1973 true /* send to tty */,
1974 oome /* pass along out-of-memory-error flag */);
1975 dumper.dump(my_path);
1976 }
