| /* |
| * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "classfile/symbolTable.hpp" |
| #include "classfile/systemDictionary.hpp" |
| #include "classfile/vmSymbols.hpp" |
| #include "gc/shared/gcLocker.inline.hpp" |
| #include "gc/shared/genCollectedHeap.hpp" |
| #include "gc/shared/vmGCOperations.hpp" |
| #include "memory/resourceArea.hpp" |
| #include "memory/universe.hpp" |
| #include "oops/objArrayKlass.hpp" |
| #include "oops/objArrayOop.inline.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "prims/jvm.h" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/jniHandles.hpp" |
| #include "runtime/os.hpp" |
| #include "runtime/reflectionUtils.hpp" |
| #include "runtime/vframe.hpp" |
| #include "runtime/vmThread.hpp" |
| #include "runtime/vm_operations.hpp" |
| #include "services/heapDumper.hpp" |
| #include "services/threadService.hpp" |
| #include "utilities/macros.hpp" |
| #include "utilities/ostream.hpp" |
| #if INCLUDE_ALL_GCS |
| #include "gc/parallel/parallelScavengeHeap.hpp" |
| #endif // INCLUDE_ALL_GCS |
| |
| /* |
| * HPROF binary format - description copied from: |
| * src/share/demo/jvmti/hprof/hprof_io.c |
| * |
| * |
| * header "JAVA PROFILE 1.0.2" (0-terminated) |
| * |
| * u4 size of identifiers. Identifiers are used to represent |
| * UTF8 strings, objects, stack traces, etc. They usually |
| * have the same size as host pointers. For example, on |
| * Solaris and Win32, the size is 4. |
| * u4 high word |
| * u4 low word number of milliseconds since 0:00 GMT, 1/1/70 |
| * [record]* a sequence of records. |
| * |
| * |
| * Record format: |
| * |
| * u1 a TAG denoting the type of the record |
| * u4 number of *microseconds* since the time stamp in the |
| * header. (wraps around in a little more than an hour) |
| * u4 number of bytes *remaining* in the record. Note that |
| * this number excludes the tag and the length field itself. |
| * [u1]* BODY of the record (a sequence of bytes) |
| * |
| * |
| * The following TAGs are supported: |
| * |
| * TAG BODY notes |
| *---------------------------------------------------------- |
| * HPROF_UTF8 a UTF8-encoded name |
| * |
| * id name ID |
| * [u1]* UTF8 characters (no trailing zero) |
| * |
| * HPROF_LOAD_CLASS a newly loaded class |
| * |
| * u4 class serial number (> 0) |
| * id class object ID |
| * u4 stack trace serial number |
| * id class name ID |
| * |
| * HPROF_UNLOAD_CLASS an unloading class |
| * |
| * u4 class serial_number |
| * |
| * HPROF_FRAME a Java stack frame |
| * |
| * id stack frame ID |
| * id method name ID |
| * id method signature ID |
| * id source file name ID |
| * u4 class serial number |
| * i4 line number. >0: normal |
| * -1: unknown |
| * -2: compiled method |
| * -3: native method |
| * |
| * HPROF_TRACE a Java stack trace |
| * |
| * u4 stack trace serial number |
| * u4 thread serial number |
| * u4 number of frames |
| * [id]* stack frame IDs |
| * |
| * |
| * HPROF_ALLOC_SITES a set of heap allocation sites, obtained after GC |
| * |
| * u2 flags 0x0001: incremental vs. complete |
| * 0x0002: sorted by allocation vs. live |
| * 0x0004: whether to force a GC |
| * u4 cutoff ratio |
| * u4 total live bytes |
| * u4 total live instances |
| * u8 total bytes allocated |
| * u8 total instances allocated |
| * u4 number of sites that follow |
| * [u1 is_array: 0: normal object |
| * 2: object array |
| * 4: boolean array |
| * 5: char array |
| * 6: float array |
| * 7: double array |
| * 8: byte array |
| * 9: short array |
| * 10: int array |
| * 11: long array |
| * u4 class serial number (may be zero during startup) |
| * u4 stack trace serial number |
| * u4 number of bytes alive |
| * u4 number of instances alive |
| * u4 number of bytes allocated |
| * u4]* number of instance allocated |
| * |
| * HPROF_START_THREAD a newly started thread. |
| * |
| * u4 thread serial number (> 0) |
| * id thread object ID |
| * u4 stack trace serial number |
| * id thread name ID |
| * id thread group name ID |
| * id thread group parent name ID |
| * |
| * HPROF_END_THREAD a terminating thread. |
| * |
| * u4 thread serial number |
| * |
| * HPROF_HEAP_SUMMARY heap summary |
| * |
| * u4 total live bytes |
| * u4 total live instances |
| * u8 total bytes allocated |
| * u8 total instances allocated |
| * |
| * HPROF_HEAP_DUMP denote a heap dump |
| * |
| * [heap dump sub-records]* |
| * |
| * There are four kinds of heap dump sub-records: |
| * |
| * u1 sub-record type |
| * |
| * HPROF_GC_ROOT_UNKNOWN unknown root |
| * |
| * id object ID |
| * |
| * HPROF_GC_ROOT_THREAD_OBJ thread object |
| * |
| * id thread object ID (may be 0 for a |
| * thread newly attached through JNI) |
| * u4 thread sequence number |
| * u4 stack trace sequence number |
| * |
| * HPROF_GC_ROOT_JNI_GLOBAL JNI global ref root |
| * |
| * id object ID |
| * id JNI global ref ID |
| * |
| * HPROF_GC_ROOT_JNI_LOCAL JNI local ref |
| * |
| * id object ID |
| * u4 thread serial number |
| * u4 frame # in stack trace (-1 for empty) |
| * |
| * HPROF_GC_ROOT_JAVA_FRAME Java stack frame |
| * |
| * id object ID |
| * u4 thread serial number |
| * u4 frame # in stack trace (-1 for empty) |
| * |
| * HPROF_GC_ROOT_NATIVE_STACK Native stack |
| * |
| * id object ID |
| * u4 thread serial number |
| * |
| * HPROF_GC_ROOT_STICKY_CLASS System class |
| * |
| * id object ID |
| * |
| * HPROF_GC_ROOT_THREAD_BLOCK Reference from thread block |
| * |
| * id object ID |
| * u4 thread serial number |
| * |
| * HPROF_GC_ROOT_MONITOR_USED Busy monitor |
| * |
| * id object ID |
| * |
| * HPROF_GC_CLASS_DUMP dump of a class object |
| * |
| * id class object ID |
| * u4 stack trace serial number |
| * id super class object ID |
| * id class loader object ID |
| * id signers object ID |
| * id protection domain object ID |
| * id reserved |
| * id reserved |
| * |
| * u4 instance size (in bytes) |
| * |
| * u2 size of constant pool |
| * [u2, constant pool index, |
| * ty, type |
| * 2: object |
| * 4: boolean |
| * 5: char |
| * 6: float |
| * 7: double |
| * 8: byte |
| * 9: short |
| * 10: int |
| * 11: long |
| * vl]* and value |
| * |
| * u2 number of static fields |
| * [id, static field name, |
| * ty, type, |
| * vl]* and value |
| * |
| * u2 number of inst. fields (not inc. super) |
| * [id, instance field name, |
| * ty]* type |
| * |
| * HPROF_GC_INSTANCE_DUMP dump of a normal object |
| * |
| * id object ID |
| * u4 stack trace serial number |
| * id class object ID |
| * u4 number of bytes that follow |
| * [vl]* instance field values (class, followed |
| * by super, super's super ...) |
| * |
| * HPROF_GC_OBJ_ARRAY_DUMP dump of an object array |
| * |
| * id array object ID |
| * u4 stack trace serial number |
| * u4 number of elements |
| * id array class ID |
| * [id]* elements |
| * |
| * HPROF_GC_PRIM_ARRAY_DUMP dump of a primitive array |
| * |
| * id array object ID |
| * u4 stack trace serial number |
| * u4 number of elements |
| * u1 element type |
| * 4: boolean array |
| * 5: char array |
| * 6: float array |
| * 7: double array |
| * 8: byte array |
| * 9: short array |
| * 10: int array |
| * 11: long array |
| * [u1]* elements |
| * |
| * HPROF_CPU_SAMPLES a set of sample traces of running threads |
| * |
| * u4 total number of samples |
| * u4 # of traces |
| * [u4 # of samples |
| * u4]* stack trace serial number |
| * |
| * HPROF_CONTROL_SETTINGS the settings of on/off switches |
| * |
| * u4 0x00000001: alloc traces on/off |
| * 0x00000002: cpu sampling on/off |
| * u2 stack trace depth |
| * |
| * |
| * When the header is "JAVA PROFILE 1.0.2" a heap dump can optionally |
| * be generated as a sequence of heap dump segments. This sequence is |
| * terminated by an end record. The additional tags allowed by format |
| * "JAVA PROFILE 1.0.2" are: |
| * |
| * HPROF_HEAP_DUMP_SEGMENT denote a heap dump segment |
| * |
| * [heap dump sub-records]* |
| * The same sub-record types allowed by HPROF_HEAP_DUMP |
| * |
| * HPROF_HEAP_DUMP_END denotes the end of a heap dump |
| * |
| */ |
| |
| |
| // HPROF tags |
| |
| typedef enum { |
| // top-level records |
| HPROF_UTF8 = 0x01, |
| HPROF_LOAD_CLASS = 0x02, |
| HPROF_UNLOAD_CLASS = 0x03, |
| HPROF_FRAME = 0x04, |
| HPROF_TRACE = 0x05, |
| HPROF_ALLOC_SITES = 0x06, |
| HPROF_HEAP_SUMMARY = 0x07, |
| HPROF_START_THREAD = 0x0A, |
| HPROF_END_THREAD = 0x0B, |
| HPROF_HEAP_DUMP = 0x0C, |
| HPROF_CPU_SAMPLES = 0x0D, |
| HPROF_CONTROL_SETTINGS = 0x0E, |
| |
| // 1.0.2 record types |
| HPROF_HEAP_DUMP_SEGMENT = 0x1C, |
| HPROF_HEAP_DUMP_END = 0x2C, |
| |
| // field types |
| HPROF_ARRAY_OBJECT = 0x01, |
| HPROF_NORMAL_OBJECT = 0x02, |
| HPROF_BOOLEAN = 0x04, |
| HPROF_CHAR = 0x05, |
| HPROF_FLOAT = 0x06, |
| HPROF_DOUBLE = 0x07, |
| HPROF_BYTE = 0x08, |
| HPROF_SHORT = 0x09, |
| HPROF_INT = 0x0A, |
| HPROF_LONG = 0x0B, |
| |
| // data-dump sub-records |
| HPROF_GC_ROOT_UNKNOWN = 0xFF, |
| HPROF_GC_ROOT_JNI_GLOBAL = 0x01, |
| HPROF_GC_ROOT_JNI_LOCAL = 0x02, |
| HPROF_GC_ROOT_JAVA_FRAME = 0x03, |
| HPROF_GC_ROOT_NATIVE_STACK = 0x04, |
| HPROF_GC_ROOT_STICKY_CLASS = 0x05, |
| HPROF_GC_ROOT_THREAD_BLOCK = 0x06, |
| HPROF_GC_ROOT_MONITOR_USED = 0x07, |
| HPROF_GC_ROOT_THREAD_OBJ = 0x08, |
| HPROF_GC_CLASS_DUMP = 0x20, |
| HPROF_GC_INSTANCE_DUMP = 0x21, |
| HPROF_GC_OBJ_ARRAY_DUMP = 0x22, |
| HPROF_GC_PRIM_ARRAY_DUMP = 0x23 |
| } hprofTag; |
| |
| // Default stack trace ID (used for dummy HPROF_TRACE record) |
| enum { |
| STACK_TRACE_ID = 1, |
| INITIAL_CLASS_COUNT = 200 |
| }; |
| |
| // Supports I/O operations on a dump file |
| |
| class DumpWriter : public StackObj { |
| private: |
| enum { |
| io_buffer_size = 8*M |
| }; |
| |
| int _fd; // file descriptor (-1 if dump file not open) |
| julong _bytes_written; // number of byte written to dump file |
| |
| char* _buffer; // internal buffer |
| size_t _size; |
| size_t _pos; |
| |
| jlong _dump_start; |
| |
| char* _error; // error message when I/O fails |
| |
| void set_file_descriptor(int fd) { _fd = fd; } |
| int file_descriptor() const { return _fd; } |
| |
| char* buffer() const { return _buffer; } |
| size_t buffer_size() const { return _size; } |
| size_t position() const { return _pos; } |
| void set_position(size_t pos) { _pos = pos; } |
| |
| void set_error(const char* error) { _error = (char*)os::strdup(error); } |
| |
| // all I/O go through this function |
| void write_internal(void* s, size_t len); |
| |
| public: |
| DumpWriter(const char* path); |
| ~DumpWriter(); |
| |
| void close(); |
| bool is_open() const { return file_descriptor() >= 0; } |
| void flush(); |
| |
| jlong dump_start() const { return _dump_start; } |
| void set_dump_start(jlong pos); |
| julong current_record_length(); |
| |
| // total number of bytes written to the disk |
| julong bytes_written() const { return _bytes_written; } |
| |
| // adjust the number of bytes written to disk (used to keep the count |
| // of the number of bytes written in case of rewrites) |
| void adjust_bytes_written(jlong n) { _bytes_written += n; } |
| |
| // number of (buffered) bytes as yet unwritten to the dump file |
| size_t bytes_unwritten() const { return position(); } |
| |
| char* error() const { return _error; } |
| |
| jlong current_offset(); |
| void seek_to_offset(jlong pos); |
| |
| // writer functions |
| void write_raw(void* s, size_t len); |
| void write_u1(u1 x) { write_raw((void*)&x, 1); } |
| void write_u2(u2 x); |
| void write_u4(u4 x); |
| void write_u8(u8 x); |
| void write_objectID(oop o); |
| void write_symbolID(Symbol* o); |
| void write_classID(Klass* k); |
| void write_id(u4 x); |
| }; |
| |
| DumpWriter::DumpWriter(const char* path) { |
| // try to allocate an I/O buffer of io_buffer_size. If there isn't |
| // sufficient memory then reduce size until we can allocate something. |
| _size = io_buffer_size; |
| do { |
| _buffer = (char*)os::malloc(_size, mtInternal); |
| if (_buffer == NULL) { |
| _size = _size >> 1; |
| } |
| } while (_buffer == NULL && _size > 0); |
| assert((_size > 0 && _buffer != NULL) || (_size == 0 && _buffer == NULL), "sanity check"); |
| _pos = 0; |
| _error = NULL; |
| _bytes_written = 0L; |
| _dump_start = (jlong)-1; |
| _fd = os::create_binary_file(path, false); // don't replace existing file |
| |
| // if the open failed we record the error |
| if (_fd < 0) { |
| _error = (char*)os::strdup(os::strerror(errno)); |
| } |
| } |
| |
| DumpWriter::~DumpWriter() { |
| // flush and close dump file |
| if (is_open()) { |
| close(); |
| } |
| if (_buffer != NULL) os::free(_buffer); |
| if (_error != NULL) os::free(_error); |
| } |
| |
| // closes dump file (if open) |
| void DumpWriter::close() { |
| // flush and close dump file |
| if (is_open()) { |
| flush(); |
| os::close(file_descriptor()); |
| set_file_descriptor(-1); |
| } |
| } |
| |
| // sets the dump starting position |
| void DumpWriter::set_dump_start(jlong pos) { |
| _dump_start = pos; |
| } |
| |
| julong DumpWriter::current_record_length() { |
| if (is_open()) { |
| // calculate the size of the dump record |
| julong dump_end = bytes_written() + bytes_unwritten(); |
| assert(dump_end == (size_t)current_offset(), "checking"); |
| julong dump_len = dump_end - dump_start() - 4; |
| return dump_len; |
| } |
| return 0; |
| } |
| |
| // write directly to the file |
| void DumpWriter::write_internal(void* s, size_t len) { |
| if (is_open()) { |
| const char* pos = (char*)s; |
| ssize_t n = 0; |
| while (len > 0) { |
| uint tmp = (uint)MIN2(len, (size_t)UINT_MAX); |
| n = os::write(file_descriptor(), pos, tmp); |
| |
| if (n < 0) { |
| // EINTR cannot happen here, os::write will take care of that |
| set_error(os::strerror(errno)); |
| os::close(file_descriptor()); |
| set_file_descriptor(-1); |
| return; |
| } |
| |
| _bytes_written += n; |
| pos += n; |
| len -= n; |
| } |
| } |
| } |
| |
| // write raw bytes |
| void DumpWriter::write_raw(void* s, size_t len) { |
| if (is_open()) { |
| // flush buffer to make room |
| if ((position() + len) >= buffer_size()) { |
| flush(); |
| } |
| |
| // buffer not available or too big to buffer it |
| if ((buffer() == NULL) || (len >= buffer_size())) { |
| write_internal(s, len); |
| } else { |
| // Should optimize this for u1/u2/u4/u8 sizes. |
| memcpy(buffer() + position(), s, len); |
| set_position(position() + len); |
| } |
| } |
| } |
| |
| // flush any buffered bytes to the file |
| void DumpWriter::flush() { |
| if (is_open() && position() > 0) { |
| write_internal(buffer(), position()); |
| set_position(0); |
| } |
| } |
| |
| jlong DumpWriter::current_offset() { |
| if (is_open()) { |
| // the offset is the file offset plus whatever we have buffered |
| jlong offset = os::current_file_offset(file_descriptor()); |
| assert(offset >= 0, "lseek failed"); |
| return offset + position(); |
| } else { |
| return (jlong)-1; |
| } |
| } |
| |
| void DumpWriter::seek_to_offset(jlong off) { |
| assert(off >= 0, "bad offset"); |
| |
| // need to flush before seeking |
| flush(); |
| |
| // may be closed due to I/O error |
| if (is_open()) { |
| jlong n = os::seek_to_file_offset(file_descriptor(), off); |
| assert(n >= 0, "lseek failed"); |
| } |
| } |
| |
| void DumpWriter::write_u2(u2 x) { |
| u2 v; |
| Bytes::put_Java_u2((address)&v, x); |
| write_raw((void*)&v, 2); |
| } |
| |
| void DumpWriter::write_u4(u4 x) { |
| u4 v; |
| Bytes::put_Java_u4((address)&v, x); |
| write_raw((void*)&v, 4); |
| } |
| |
| void DumpWriter::write_u8(u8 x) { |
| u8 v; |
| Bytes::put_Java_u8((address)&v, x); |
| write_raw((void*)&v, 8); |
| } |
| |
| void DumpWriter::write_objectID(oop o) { |
| address a = (address)o; |
| #ifdef _LP64 |
| write_u8((u8)a); |
| #else |
| write_u4((u4)a); |
| #endif |
| } |
| |
| void DumpWriter::write_symbolID(Symbol* s) { |
| address a = (address)((uintptr_t)s); |
| #ifdef _LP64 |
| write_u8((u8)a); |
| #else |
| write_u4((u4)a); |
| #endif |
| } |
| |
| void DumpWriter::write_id(u4 x) { |
| #ifdef _LP64 |
| write_u8((u8) x); |
| #else |
| write_u4(x); |
| #endif |
| } |
| |
| // We use java mirror as the class ID |
| void DumpWriter::write_classID(Klass* k) { |
| write_objectID(k->java_mirror()); |
| } |
| |
| |
| |
| // Support class with a collection of functions used when dumping the heap |
| |
| class DumperSupport : AllStatic { |
| public: |
| |
| // write a header of the given type |
| static void write_header(DumpWriter* writer, hprofTag tag, u4 len); |
| |
| // returns hprof tag for the given type signature |
| static hprofTag sig2tag(Symbol* sig); |
| // returns hprof tag for the given basic type |
| static hprofTag type2tag(BasicType type); |
| |
| // returns the size of the instance of the given class |
| static u4 instance_size(Klass* k); |
| |
| // dump a jfloat |
| static void dump_float(DumpWriter* writer, jfloat f); |
| // dump a jdouble |
| static void dump_double(DumpWriter* writer, jdouble d); |
| // dumps the raw value of the given field |
| static void dump_field_value(DumpWriter* writer, char type, address addr); |
| // dumps static fields of the given class |
| static void dump_static_fields(DumpWriter* writer, Klass* k); |
| // dump the raw values of the instance fields of the given object |
| static void dump_instance_fields(DumpWriter* writer, oop o); |
| // dumps the definition of the instance fields for a given class |
| static void dump_instance_field_descriptors(DumpWriter* writer, Klass* k); |
| // creates HPROF_GC_INSTANCE_DUMP record for the given object |
| static void dump_instance(DumpWriter* writer, oop o); |
| // creates HPROF_GC_CLASS_DUMP record for the given class and each of its |
| // array classes |
| static void dump_class_and_array_classes(DumpWriter* writer, Klass* k); |
| // creates HPROF_GC_CLASS_DUMP record for a given primitive array |
| // class (and each multi-dimensional array class too) |
| static void dump_basic_type_array_class(DumpWriter* writer, Klass* k); |
| |
| // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array |
| static void dump_object_array(DumpWriter* writer, objArrayOop array); |
| // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array |
| static void dump_prim_array(DumpWriter* writer, typeArrayOop array); |
| // create HPROF_FRAME record for the given method and bci |
| static void dump_stack_frame(DumpWriter* writer, int frame_serial_num, int class_serial_num, Method* m, int bci); |
| |
| // check if we need to truncate an array |
| static int calculate_array_max_length(DumpWriter* writer, arrayOop array, short header_size); |
| |
| // writes a HPROF_HEAP_DUMP_SEGMENT record |
| static void write_dump_header(DumpWriter* writer); |
| |
| // fixes up the length of the current dump record |
| static void write_current_dump_record_length(DumpWriter* writer); |
| |
| // fixes up the current dump record and writes HPROF_HEAP_DUMP_END record |
| static void end_of_dump(DumpWriter* writer); |
| }; |
| |
| // write a header of the given type |
| void DumperSupport:: write_header(DumpWriter* writer, hprofTag tag, u4 len) { |
| writer->write_u1((u1)tag); |
| writer->write_u4(0); // current ticks |
| writer->write_u4(len); |
| } |
| |
| // returns hprof tag for the given type signature |
| hprofTag DumperSupport::sig2tag(Symbol* sig) { |
| switch (sig->byte_at(0)) { |
| case JVM_SIGNATURE_CLASS : return HPROF_NORMAL_OBJECT; |
| case JVM_SIGNATURE_ARRAY : return HPROF_NORMAL_OBJECT; |
| case JVM_SIGNATURE_BYTE : return HPROF_BYTE; |
| case JVM_SIGNATURE_CHAR : return HPROF_CHAR; |
| case JVM_SIGNATURE_FLOAT : return HPROF_FLOAT; |
| case JVM_SIGNATURE_DOUBLE : return HPROF_DOUBLE; |
| case JVM_SIGNATURE_INT : return HPROF_INT; |
| case JVM_SIGNATURE_LONG : return HPROF_LONG; |
| case JVM_SIGNATURE_SHORT : return HPROF_SHORT; |
| case JVM_SIGNATURE_BOOLEAN : return HPROF_BOOLEAN; |
| default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; |
| } |
| } |
| |
| hprofTag DumperSupport::type2tag(BasicType type) { |
| switch (type) { |
| case T_BYTE : return HPROF_BYTE; |
| case T_CHAR : return HPROF_CHAR; |
| case T_FLOAT : return HPROF_FLOAT; |
| case T_DOUBLE : return HPROF_DOUBLE; |
| case T_INT : return HPROF_INT; |
| case T_LONG : return HPROF_LONG; |
| case T_SHORT : return HPROF_SHORT; |
| case T_BOOLEAN : return HPROF_BOOLEAN; |
| default : ShouldNotReachHere(); /* to shut up compiler */ return HPROF_BYTE; |
| } |
| } |
| |
| // dump a jfloat |
| void DumperSupport::dump_float(DumpWriter* writer, jfloat f) { |
| if (g_isnan(f)) { |
| writer->write_u4(0x7fc00000); // collapsing NaNs |
| } else { |
| union { |
| int i; |
| float f; |
| } u; |
| u.f = (float)f; |
| writer->write_u4((u4)u.i); |
| } |
| } |
| |
| // dump a jdouble |
| void DumperSupport::dump_double(DumpWriter* writer, jdouble d) { |
| union { |
| jlong l; |
| double d; |
| } u; |
| if (g_isnan(d)) { // collapsing NaNs |
| u.l = (jlong)(0x7ff80000); |
| u.l = (u.l << 32); |
| } else { |
| u.d = (double)d; |
| } |
| writer->write_u8((u8)u.l); |
| } |
| |
| // dumps the raw value of the given field |
| void DumperSupport::dump_field_value(DumpWriter* writer, char type, address addr) { |
| switch (type) { |
| case JVM_SIGNATURE_CLASS : |
| case JVM_SIGNATURE_ARRAY : { |
| oop o; |
| if (UseCompressedOops) { |
| o = oopDesc::load_decode_heap_oop((narrowOop*)addr); |
| } else { |
| o = oopDesc::load_decode_heap_oop((oop*)addr); |
| } |
| |
| // reflection and Unsafe classes may have a reference to a |
| // Klass* so filter it out. |
| assert(oopDesc::is_oop_or_null(o), "Expected an oop or NULL at " PTR_FORMAT, p2i(o)); |
| writer->write_objectID(o); |
| break; |
| } |
| case JVM_SIGNATURE_BYTE : { |
| jbyte* b = (jbyte*)addr; |
| writer->write_u1((u1)*b); |
| break; |
| } |
| case JVM_SIGNATURE_CHAR : { |
| jchar* c = (jchar*)addr; |
| writer->write_u2((u2)*c); |
| break; |
| } |
| case JVM_SIGNATURE_SHORT : { |
| jshort* s = (jshort*)addr; |
| writer->write_u2((u2)*s); |
| break; |
| } |
| case JVM_SIGNATURE_FLOAT : { |
| jfloat* f = (jfloat*)addr; |
| dump_float(writer, *f); |
| break; |
| } |
| case JVM_SIGNATURE_DOUBLE : { |
| jdouble* f = (jdouble*)addr; |
| dump_double(writer, *f); |
| break; |
| } |
| case JVM_SIGNATURE_INT : { |
| jint* i = (jint*)addr; |
| writer->write_u4((u4)*i); |
| break; |
| } |
| case JVM_SIGNATURE_LONG : { |
| jlong* l = (jlong*)addr; |
| writer->write_u8((u8)*l); |
| break; |
| } |
| case JVM_SIGNATURE_BOOLEAN : { |
| jboolean* b = (jboolean*)addr; |
| writer->write_u1((u1)*b); |
| break; |
| } |
| default : ShouldNotReachHere(); |
| } |
| } |
| |
| // returns the size of the instance of the given class |
| u4 DumperSupport::instance_size(Klass* k) { |
| HandleMark hm; |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| |
| u4 size = 0; |
| |
| for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) { |
| if (!fld.access_flags().is_static()) { |
| Symbol* sig = fld.signature(); |
| switch (sig->byte_at(0)) { |
| case JVM_SIGNATURE_CLASS : |
| case JVM_SIGNATURE_ARRAY : size += oopSize; break; |
| |
| case JVM_SIGNATURE_BYTE : |
| case JVM_SIGNATURE_BOOLEAN : size += 1; break; |
| |
| case JVM_SIGNATURE_CHAR : |
| case JVM_SIGNATURE_SHORT : size += 2; break; |
| |
| case JVM_SIGNATURE_INT : |
| case JVM_SIGNATURE_FLOAT : size += 4; break; |
| |
| case JVM_SIGNATURE_LONG : |
| case JVM_SIGNATURE_DOUBLE : size += 8; break; |
| |
| default : ShouldNotReachHere(); |
| } |
| } |
| } |
| return size; |
| } |
| |
| // dumps static fields of the given class |
| void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) { |
| HandleMark hm; |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| |
| // pass 1 - count the static fields |
| u2 field_count = 0; |
| for (FieldStream fldc(ik, true, true); !fldc.eos(); fldc.next()) { |
| if (fldc.access_flags().is_static()) field_count++; |
| } |
| |
| writer->write_u2(field_count); |
| |
| // pass 2 - dump the field descriptors and raw values |
| for (FieldStream fld(ik, true, true); !fld.eos(); fld.next()) { |
| if (fld.access_flags().is_static()) { |
| Symbol* sig = fld.signature(); |
| |
| writer->write_symbolID(fld.name()); // name |
| writer->write_u1(sig2tag(sig)); // type |
| |
| // value |
| int offset = fld.offset(); |
| address addr = (address)ik->java_mirror() + offset; |
| |
| dump_field_value(writer, sig->byte_at(0), addr); |
| } |
| } |
| } |
| |
| // dump the raw values of the instance fields of the given object |
| void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) { |
| HandleMark hm; |
| InstanceKlass* ik = InstanceKlass::cast(o->klass()); |
| |
| for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) { |
| if (!fld.access_flags().is_static()) { |
| Symbol* sig = fld.signature(); |
| address addr = (address)o + fld.offset(); |
| |
| dump_field_value(writer, sig->byte_at(0), addr); |
| } |
| } |
| } |
| |
| // dumps the definition of the instance fields for a given class |
| void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) { |
| HandleMark hm; |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| |
| // pass 1 - count the instance fields |
| u2 field_count = 0; |
| for (FieldStream fldc(ik, true, true); !fldc.eos(); fldc.next()) { |
| if (!fldc.access_flags().is_static()) field_count++; |
| } |
| |
| writer->write_u2(field_count); |
| |
| // pass 2 - dump the field descriptors |
| for (FieldStream fld(ik, true, true); !fld.eos(); fld.next()) { |
| if (!fld.access_flags().is_static()) { |
| Symbol* sig = fld.signature(); |
| |
| writer->write_symbolID(fld.name()); // name |
| writer->write_u1(sig2tag(sig)); // type |
| } |
| } |
| } |
| |
| // creates HPROF_GC_INSTANCE_DUMP record for the given object |
| void DumperSupport::dump_instance(DumpWriter* writer, oop o) { |
| Klass* k = o->klass(); |
| |
| writer->write_u1(HPROF_GC_INSTANCE_DUMP); |
| writer->write_objectID(o); |
| writer->write_u4(STACK_TRACE_ID); |
| |
| // class ID |
| writer->write_classID(k); |
| |
| // number of bytes that follow |
| writer->write_u4(instance_size(k) ); |
| |
| // field values |
| dump_instance_fields(writer, o); |
| } |
| |
| // creates HPROF_GC_CLASS_DUMP record for the given class and each of |
| // its array classes |
| void DumperSupport::dump_class_and_array_classes(DumpWriter* writer, Klass* k) { |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| |
| // We can safepoint and do a heap dump at a point where we have a Klass, |
| // but no java mirror class has been setup for it. So we need to check |
| // that the class is at least loaded, to avoid crash from a null mirror. |
| if (!ik->is_loaded()) { |
| return; |
| } |
| |
| writer->write_u1(HPROF_GC_CLASS_DUMP); |
| |
| // class ID |
| writer->write_classID(ik); |
| writer->write_u4(STACK_TRACE_ID); |
| |
| // super class ID |
| Klass* java_super = ik->java_super(); |
| if (java_super == NULL) { |
| writer->write_objectID(oop(NULL)); |
| } else { |
| writer->write_classID(java_super); |
| } |
| |
| writer->write_objectID(ik->class_loader()); |
| writer->write_objectID(ik->signers()); |
| writer->write_objectID(ik->protection_domain()); |
| |
| // reserved |
| writer->write_objectID(oop(NULL)); |
| writer->write_objectID(oop(NULL)); |
| |
| // instance size |
| writer->write_u4(DumperSupport::instance_size(k)); |
| |
| // size of constant pool - ignored by HAT 1.1 |
| writer->write_u2(0); |
| |
| // number of static fields |
| dump_static_fields(writer, k); |
| |
| // description of instance fields |
| dump_instance_field_descriptors(writer, k); |
| |
| // array classes |
| k = k->array_klass_or_null(); |
| while (k != NULL) { |
| Klass* klass = k; |
| assert(klass->is_objArray_klass(), "not an ObjArrayKlass"); |
| |
| writer->write_u1(HPROF_GC_CLASS_DUMP); |
| writer->write_classID(klass); |
| writer->write_u4(STACK_TRACE_ID); |
| |
| // super class of array classes is java.lang.Object |
| java_super = klass->java_super(); |
| assert(java_super != NULL, "checking"); |
| writer->write_classID(java_super); |
| |
| writer->write_objectID(ik->class_loader()); |
| writer->write_objectID(ik->signers()); |
| writer->write_objectID(ik->protection_domain()); |
| |
| writer->write_objectID(oop(NULL)); // reserved |
| writer->write_objectID(oop(NULL)); |
| writer->write_u4(0); // instance size |
| writer->write_u2(0); // constant pool |
| writer->write_u2(0); // static fields |
| writer->write_u2(0); // instance fields |
| |
| // get the array class for the next rank |
| k = klass->array_klass_or_null(); |
| } |
| } |
| |
| // creates HPROF_GC_CLASS_DUMP record for a given primitive array |
| // class (and each multi-dimensional array class too) |
| void DumperSupport::dump_basic_type_array_class(DumpWriter* writer, Klass* k) { |
| // array classes |
| while (k != NULL) { |
| Klass* klass = k; |
| |
| writer->write_u1(HPROF_GC_CLASS_DUMP); |
| writer->write_classID(klass); |
| writer->write_u4(STACK_TRACE_ID); |
| |
| // super class of array classes is java.lang.Object |
| Klass* java_super = klass->java_super(); |
| assert(java_super != NULL, "checking"); |
| writer->write_classID(java_super); |
| |
| writer->write_objectID(oop(NULL)); // loader |
| writer->write_objectID(oop(NULL)); // signers |
| writer->write_objectID(oop(NULL)); // protection domain |
| |
| writer->write_objectID(oop(NULL)); // reserved |
| writer->write_objectID(oop(NULL)); |
| writer->write_u4(0); // instance size |
| writer->write_u2(0); // constant pool |
| writer->write_u2(0); // static fields |
| writer->write_u2(0); // instance fields |
| |
| // get the array class for the next rank |
| k = klass->array_klass_or_null(); |
| } |
| } |
| |
| // Hprof uses an u4 as record length field, |
| // which means we need to truncate arrays that are too long. |
| int DumperSupport::calculate_array_max_length(DumpWriter* writer, arrayOop array, short header_size) { |
| BasicType type = ArrayKlass::cast(array->klass())->element_type(); |
| assert(type >= T_BOOLEAN && type <= T_OBJECT, "invalid array element type"); |
| |
| int length = array->length(); |
| |
| int type_size; |
| if (type == T_OBJECT) { |
| type_size = sizeof(address); |
| } else { |
| type_size = type2aelembytes(type); |
| } |
| |
| size_t length_in_bytes = (size_t)length * type_size; |
| |
| // Create a new record if the current record is non-empty and the array can't fit. |
| julong current_record_length = writer->current_record_length(); |
| if (current_record_length > 0 && |
| (current_record_length + header_size + length_in_bytes) > max_juint) { |
| write_current_dump_record_length(writer); |
| write_dump_header(writer); |
| |
| // We now have an empty record. |
| current_record_length = 0; |
| } |
| |
| // Calculate max bytes we can use. |
| uint max_bytes = max_juint - (header_size + current_record_length); |
| |
| // Array too long for the record? |
| // Calculate max length and return it. |
| if (length_in_bytes > max_bytes) { |
| length = max_bytes / type_size; |
| length_in_bytes = (size_t)length * type_size; |
| |
| warning("cannot dump array of type %s[] with length %d; truncating to length %d", |
| type2name_tab[type], array->length(), length); |
| } |
| return length; |
| } |
| |
| // creates HPROF_GC_OBJ_ARRAY_DUMP record for the given object array |
| void DumperSupport::dump_object_array(DumpWriter* writer, objArrayOop array) { |
| // sizeof(u1) + 2 * sizeof(u4) + sizeof(objectID) + sizeof(classID) |
| short header_size = 1 + 2 * 4 + 2 * sizeof(address); |
| |
| int length = calculate_array_max_length(writer, array, header_size); |
| |
| writer->write_u1(HPROF_GC_OBJ_ARRAY_DUMP); |
| writer->write_objectID(array); |
| writer->write_u4(STACK_TRACE_ID); |
| writer->write_u4(length); |
| |
| // array class ID |
| writer->write_classID(array->klass()); |
| |
| // [id]* elements |
| for (int index = 0; index < length; index++) { |
| oop o = array->obj_at(index); |
| writer->write_objectID(o); |
| } |
| } |
| |
| #define WRITE_ARRAY(Array, Type, Size, Length) \ |
| for (int i = 0; i < Length; i++) { writer->write_##Size((Size)Array->Type##_at(i)); } |
| |
| // creates HPROF_GC_PRIM_ARRAY_DUMP record for the given type array |
| void DumperSupport::dump_prim_array(DumpWriter* writer, typeArrayOop array) { |
| BasicType type = TypeArrayKlass::cast(array->klass())->element_type(); |
| |
| // 2 * sizeof(u1) + 2 * sizeof(u4) + sizeof(objectID) |
| short header_size = 2 * 1 + 2 * 4 + sizeof(address); |
| |
| int length = calculate_array_max_length(writer, array, header_size); |
| int type_size = type2aelembytes(type); |
| u4 length_in_bytes = (u4)length * type_size; |
| |
| writer->write_u1(HPROF_GC_PRIM_ARRAY_DUMP); |
| writer->write_objectID(array); |
| writer->write_u4(STACK_TRACE_ID); |
| writer->write_u4(length); |
| writer->write_u1(type2tag(type)); |
| |
| // nothing to copy |
| if (length == 0) { |
| return; |
| } |
| |
| // If the byte ordering is big endian then we can copy most types directly |
| |
| switch (type) { |
| case T_INT : { |
| if (Endian::is_Java_byte_ordering_different()) { |
| WRITE_ARRAY(array, int, u4, length); |
| } else { |
| writer->write_raw((void*)(array->int_at_addr(0)), length_in_bytes); |
| } |
| break; |
| } |
| case T_BYTE : { |
| writer->write_raw((void*)(array->byte_at_addr(0)), length_in_bytes); |
| break; |
| } |
| case T_CHAR : { |
| if (Endian::is_Java_byte_ordering_different()) { |
| WRITE_ARRAY(array, char, u2, length); |
| } else { |
| writer->write_raw((void*)(array->char_at_addr(0)), length_in_bytes); |
| } |
| break; |
| } |
| case T_SHORT : { |
| if (Endian::is_Java_byte_ordering_different()) { |
| WRITE_ARRAY(array, short, u2, length); |
| } else { |
| writer->write_raw((void*)(array->short_at_addr(0)), length_in_bytes); |
| } |
| break; |
| } |
| case T_BOOLEAN : { |
| if (Endian::is_Java_byte_ordering_different()) { |
| WRITE_ARRAY(array, bool, u1, length); |
| } else { |
| writer->write_raw((void*)(array->bool_at_addr(0)), length_in_bytes); |
| } |
| break; |
| } |
| case T_LONG : { |
| if (Endian::is_Java_byte_ordering_different()) { |
| WRITE_ARRAY(array, long, u8, length); |
| } else { |
| writer->write_raw((void*)(array->long_at_addr(0)), length_in_bytes); |
| } |
| break; |
| } |
| |
| // handle float/doubles in a special value to ensure than NaNs are |
| // written correctly. TO DO: Check if we can avoid this on processors that |
| // use IEEE 754. |
| |
| case T_FLOAT : { |
| for (int i = 0; i < length; i++) { |
| dump_float(writer, array->float_at(i)); |
| } |
| break; |
| } |
| case T_DOUBLE : { |
| for (int i = 0; i < length; i++) { |
| dump_double(writer, array->double_at(i)); |
| } |
| break; |
| } |
| default : ShouldNotReachHere(); |
| } |
| } |
| |
| // create a HPROF_FRAME record of the given Method* and bci |
| void DumperSupport::dump_stack_frame(DumpWriter* writer, |
| int frame_serial_num, |
| int class_serial_num, |
| Method* m, |
| int bci) { |
| int line_number; |
| if (m->is_native()) { |
| line_number = -3; // native frame |
| } else { |
| line_number = m->line_number_from_bci(bci); |
| } |
| |
| write_header(writer, HPROF_FRAME, 4*oopSize + 2*sizeof(u4)); |
| writer->write_id(frame_serial_num); // frame serial number |
| writer->write_symbolID(m->name()); // method's name |
| writer->write_symbolID(m->signature()); // method's signature |
| |
| assert(m->method_holder()->is_instance_klass(), "not InstanceKlass"); |
| writer->write_symbolID(m->method_holder()->source_file_name()); // source file name |
| writer->write_u4(class_serial_num); // class serial number |
| writer->write_u4((u4) line_number); // line number |
| } |
| |
| |
| // Support class used to generate HPROF_UTF8 records from the entries in the |
| // SymbolTable. |
| |
| class SymbolTableDumper : public SymbolClosure { |
| private: |
| DumpWriter* _writer; |
| DumpWriter* writer() const { return _writer; } |
| public: |
| SymbolTableDumper(DumpWriter* writer) { _writer = writer; } |
| void do_symbol(Symbol** p); |
| }; |
| |
| void SymbolTableDumper::do_symbol(Symbol** p) { |
| ResourceMark rm; |
| Symbol* sym = load_symbol(p); |
| int len = sym->utf8_length(); |
| if (len > 0) { |
| char* s = sym->as_utf8(); |
| DumperSupport::write_header(writer(), HPROF_UTF8, oopSize + len); |
| writer()->write_symbolID(sym); |
| writer()->write_raw(s, len); |
| } |
| } |
| |
| // Support class used to generate HPROF_GC_ROOT_JNI_LOCAL records |
| |
| class JNILocalsDumper : public OopClosure { |
| private: |
| DumpWriter* _writer; |
| u4 _thread_serial_num; |
| int _frame_num; |
| DumpWriter* writer() const { return _writer; } |
| public: |
| JNILocalsDumper(DumpWriter* writer, u4 thread_serial_num) { |
| _writer = writer; |
| _thread_serial_num = thread_serial_num; |
| _frame_num = -1; // default - empty stack |
| } |
| void set_frame_number(int n) { _frame_num = n; } |
| void do_oop(oop* obj_p); |
| void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| }; |
| |
| |
| void JNILocalsDumper::do_oop(oop* obj_p) { |
| // ignore null or deleted handles |
| oop o = *obj_p; |
| if (o != NULL && o != JNIHandles::deleted_handle()) { |
| writer()->write_u1(HPROF_GC_ROOT_JNI_LOCAL); |
| writer()->write_objectID(o); |
| writer()->write_u4(_thread_serial_num); |
| writer()->write_u4((u4)_frame_num); |
| } |
| } |
| |
| |
| // Support class used to generate HPROF_GC_ROOT_JNI_GLOBAL records |
| |
| class JNIGlobalsDumper : public OopClosure { |
| private: |
| DumpWriter* _writer; |
| DumpWriter* writer() const { return _writer; } |
| |
| public: |
| JNIGlobalsDumper(DumpWriter* writer) { |
| _writer = writer; |
| } |
| void do_oop(oop* obj_p); |
| void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| }; |
| |
| void JNIGlobalsDumper::do_oop(oop* obj_p) { |
| oop o = *obj_p; |
| |
| // ignore these |
| if (o == NULL || o == JNIHandles::deleted_handle()) return; |
| |
| // we ignore global ref to symbols and other internal objects |
| if (o->is_instance() || o->is_objArray() || o->is_typeArray()) { |
| writer()->write_u1(HPROF_GC_ROOT_JNI_GLOBAL); |
| writer()->write_objectID(o); |
| writer()->write_objectID((oopDesc*)obj_p); // global ref ID |
| } |
| }; |
| |
| |
| // Support class used to generate HPROF_GC_ROOT_MONITOR_USED records |
| |
| class MonitorUsedDumper : public OopClosure { |
| private: |
| DumpWriter* _writer; |
| DumpWriter* writer() const { return _writer; } |
| public: |
| MonitorUsedDumper(DumpWriter* writer) { |
| _writer = writer; |
| } |
| void do_oop(oop* obj_p) { |
| writer()->write_u1(HPROF_GC_ROOT_MONITOR_USED); |
| writer()->write_objectID(*obj_p); |
| } |
| void do_oop(narrowOop* obj_p) { ShouldNotReachHere(); } |
| }; |
| |
| |
| // Support class used to generate HPROF_GC_ROOT_STICKY_CLASS records |
| |
| class StickyClassDumper : public KlassClosure { |
| private: |
| DumpWriter* _writer; |
| DumpWriter* writer() const { return _writer; } |
| public: |
| StickyClassDumper(DumpWriter* writer) { |
| _writer = writer; |
| } |
| void do_klass(Klass* k) { |
| if (k->is_instance_klass()) { |
| InstanceKlass* ik = InstanceKlass::cast(k); |
| writer()->write_u1(HPROF_GC_ROOT_STICKY_CLASS); |
| writer()->write_classID(ik); |
| } |
| } |
| }; |
| |
| |
| class VM_HeapDumper; |
| |
| // Support class using when iterating over the heap. |
| |
| class HeapObjectDumper : public ObjectClosure { |
| private: |
| VM_HeapDumper* _dumper; |
| DumpWriter* _writer; |
| |
| VM_HeapDumper* dumper() { return _dumper; } |
| DumpWriter* writer() { return _writer; } |
| |
| // used to indicate that a record has been writen |
| void mark_end_of_record(); |
| |
| public: |
| HeapObjectDumper(VM_HeapDumper* dumper, DumpWriter* writer) { |
| _dumper = dumper; |
| _writer = writer; |
| } |
| |
| // called for each object in the heap |
| void do_object(oop o); |
| }; |
| |
| void HeapObjectDumper::do_object(oop o) { |
| // hide the sentinel for deleted handles |
| if (o == JNIHandles::deleted_handle()) return; |
| |
| // skip classes as these emitted as HPROF_GC_CLASS_DUMP records |
| if (o->klass() == SystemDictionary::Class_klass()) { |
| if (!java_lang_Class::is_primitive(o)) { |
| return; |
| } |
| } |
| |
| if (o->is_instance()) { |
| // create a HPROF_GC_INSTANCE record for each object |
| DumperSupport::dump_instance(writer(), o); |
| mark_end_of_record(); |
| } else if (o->is_objArray()) { |
| // create a HPROF_GC_OBJ_ARRAY_DUMP record for each object array |
| DumperSupport::dump_object_array(writer(), objArrayOop(o)); |
| mark_end_of_record(); |
| } else if (o->is_typeArray()) { |
| // create a HPROF_GC_PRIM_ARRAY_DUMP record for each type array |
| DumperSupport::dump_prim_array(writer(), typeArrayOop(o)); |
| mark_end_of_record(); |
| } |
| } |
| |
| // The VM operation that performs the heap dump |
| class VM_HeapDumper : public VM_GC_Operation { |
| private: |
| static VM_HeapDumper* _global_dumper; |
| static DumpWriter* _global_writer; |
| DumpWriter* _local_writer; |
| JavaThread* _oome_thread; |
| Method* _oome_constructor; |
| bool _gc_before_heap_dump; |
| GrowableArray<Klass*>* _klass_map; |
| ThreadStackTrace** _stack_traces; |
| int _num_threads; |
| |
| // accessors and setters |
| static VM_HeapDumper* dumper() { assert(_global_dumper != NULL, "Error"); return _global_dumper; } |
| static DumpWriter* writer() { assert(_global_writer != NULL, "Error"); return _global_writer; } |
| void set_global_dumper() { |
| assert(_global_dumper == NULL, "Error"); |
| _global_dumper = this; |
| } |
| void set_global_writer() { |
| assert(_global_writer == NULL, "Error"); |
| _global_writer = _local_writer; |
| } |
| void clear_global_dumper() { _global_dumper = NULL; } |
| void clear_global_writer() { _global_writer = NULL; } |
| |
| bool skip_operation() const; |
| |
| // writes a HPROF_LOAD_CLASS record |
| static void do_load_class(Klass* k); |
| |
| // writes a HPROF_GC_CLASS_DUMP record for the given class |
| // (and each array class too) |
| static void do_class_dump(Klass* k); |
| |
| // writes a HPROF_GC_CLASS_DUMP records for a given basic type |
| // array (and each multi-dimensional array too) |
| static void do_basic_type_array_class_dump(Klass* k); |
| |
| // HPROF_GC_ROOT_THREAD_OBJ records |
| int do_thread(JavaThread* thread, u4 thread_serial_num); |
| void do_threads(); |
| |
| void add_class_serial_number(Klass* k, int serial_num) { |
| _klass_map->at_put_grow(serial_num, k); |
| } |
| |
| // HPROF_TRACE and HPROF_FRAME records |
| void dump_stack_traces(); |
| |
| public: |
| VM_HeapDumper(DumpWriter* writer, bool gc_before_heap_dump, bool oome) : |
| VM_GC_Operation(0 /* total collections, dummy, ignored */, |
| GCCause::_heap_dump /* GC Cause */, |
| 0 /* total full collections, dummy, ignored */, |
| gc_before_heap_dump) { |
| _local_writer = writer; |
| _gc_before_heap_dump = gc_before_heap_dump; |
| _klass_map = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<Klass*>(INITIAL_CLASS_COUNT, true); |
| _stack_traces = NULL; |
| _num_threads = 0; |
| if (oome) { |
| assert(!Thread::current()->is_VM_thread(), "Dump from OutOfMemoryError cannot be called by the VMThread"); |
| // get OutOfMemoryError zero-parameter constructor |
| InstanceKlass* oome_ik = SystemDictionary::OutOfMemoryError_klass(); |
| _oome_constructor = oome_ik->find_method(vmSymbols::object_initializer_name(), |
| vmSymbols::void_method_signature()); |
| // get thread throwing OOME when generating the heap dump at OOME |
| _oome_thread = JavaThread::current(); |
| } else { |
| _oome_thread = NULL; |
| _oome_constructor = NULL; |
| } |
| } |
| ~VM_HeapDumper() { |
| if (_stack_traces != NULL) { |
| for (int i=0; i < _num_threads; i++) { |
| delete _stack_traces[i]; |
| } |
| FREE_C_HEAP_ARRAY(ThreadStackTrace*, _stack_traces); |
| } |
| delete _klass_map; |
| } |
| |
| VMOp_Type type() const { return VMOp_HeapDumper; } |
| // used to mark sub-record boundary |
| void check_segment_length(); |
| void doit(); |
| }; |
| |
| VM_HeapDumper* VM_HeapDumper::_global_dumper = NULL; |
| DumpWriter* VM_HeapDumper::_global_writer = NULL; |
| |
| bool VM_HeapDumper::skip_operation() const { |
| return false; |
| } |
| |
| // writes a HPROF_HEAP_DUMP_SEGMENT record |
| void DumperSupport::write_dump_header(DumpWriter* writer) { |
| if (writer->is_open()) { |
| writer->write_u1(HPROF_HEAP_DUMP_SEGMENT); |
| writer->write_u4(0); // current ticks |
| |
| // record the starting position for the dump (its length will be fixed up later) |
| writer->set_dump_start(writer->current_offset()); |
| writer->write_u4(0); |
| } |
| } |
| |
| // fixes up the length of the current dump record |
| void DumperSupport::write_current_dump_record_length(DumpWriter* writer) { |
| if (writer->is_open()) { |
| julong dump_end = writer->bytes_written() + writer->bytes_unwritten(); |
| julong dump_len = writer->current_record_length(); |
| |
| // record length must fit in a u4 |
| if (dump_len > max_juint) { |
| warning("record is too large"); |
| } |
| |
| // seek to the dump start and fix-up the length |
| assert(writer->dump_start() >= 0, "no dump start recorded"); |
| writer->seek_to_offset(writer->dump_start()); |
| writer->write_u4((u4)dump_len); |
| |
| // adjust the total size written to keep the bytes written correct. |
| writer->adjust_bytes_written(-((jlong) sizeof(u4))); |
| |
| // seek to dump end so we can continue |
| writer->seek_to_offset(dump_end); |
| |
| // no current dump record |
| writer->set_dump_start((jlong)-1); |
| } |
| } |
| |
| // used on a sub-record boundary to check if we need to start a |
| // new segment. |
| void VM_HeapDumper::check_segment_length() { |
| if (writer()->is_open()) { |
| julong dump_len = writer()->current_record_length(); |
| |
| if (dump_len > 2UL*G) { |
| DumperSupport::write_current_dump_record_length(writer()); |
| DumperSupport::write_dump_header(writer()); |
| } |
| } |
| } |
| |
| // fixes up the current dump record and writes HPROF_HEAP_DUMP_END record |
| void DumperSupport::end_of_dump(DumpWriter* writer) { |
| if (writer->is_open()) { |
| write_current_dump_record_length(writer); |
| |
| writer->write_u1(HPROF_HEAP_DUMP_END); |
| writer->write_u4(0); |
| writer->write_u4(0); |
| } |
| } |
| |
| // marks sub-record boundary |
| void HeapObjectDumper::mark_end_of_record() { |
| dumper()->check_segment_length(); |
| } |
| |
| // writes a HPROF_LOAD_CLASS record for the class (and each of its |
| // array classes) |
| void VM_HeapDumper::do_load_class(Klass* k) { |
| static u4 class_serial_num = 0; |
| |
| // len of HPROF_LOAD_CLASS record |
| u4 remaining = 2*oopSize + 2*sizeof(u4); |
| |
| // write a HPROF_LOAD_CLASS for the class and each array class |
| do { |
| DumperSupport::write_header(writer(), HPROF_LOAD_CLASS, remaining); |
| |
| // class serial number is just a number |
| writer()->write_u4(++class_serial_num); |
| |
| // class ID |
| Klass* klass = k; |
| writer()->write_classID(klass); |
| |
| // add the Klass* and class serial number pair |
| dumper()->add_class_serial_number(klass, class_serial_num); |
| |
| writer()->write_u4(STACK_TRACE_ID); |
| |
| // class name ID |
| Symbol* name = klass->name(); |
| writer()->write_symbolID(name); |
| |
| // write a LOAD_CLASS record for the array type (if it exists) |
| k = klass->array_klass_or_null(); |
| } while (k != NULL); |
| } |
| |
| // writes a HPROF_GC_CLASS_DUMP record for the given class |
| void VM_HeapDumper::do_class_dump(Klass* k) { |
| if (k->is_instance_klass()) { |
| DumperSupport::dump_class_and_array_classes(writer(), k); |
| } |
| } |
| |
| // writes a HPROF_GC_CLASS_DUMP records for a given basic type |
| // array (and each multi-dimensional array too) |
| void VM_HeapDumper::do_basic_type_array_class_dump(Klass* k) { |
| DumperSupport::dump_basic_type_array_class(writer(), k); |
| } |
| |
| // Walk the stack of the given thread. |
| // Dumps a HPROF_GC_ROOT_JAVA_FRAME record for each local |
| // Dumps a HPROF_GC_ROOT_JNI_LOCAL record for each JNI local |
| // |
| // It returns the number of Java frames in this thread stack |
| int VM_HeapDumper::do_thread(JavaThread* java_thread, u4 thread_serial_num) { |
| JNILocalsDumper blk(writer(), thread_serial_num); |
| |
| oop threadObj = java_thread->threadObj(); |
| assert(threadObj != NULL, "sanity check"); |
| |
| int stack_depth = 0; |
| if (java_thread->has_last_Java_frame()) { |
| |
| // vframes are resource allocated |
| Thread* current_thread = Thread::current(); |
| ResourceMark rm(current_thread); |
| HandleMark hm(current_thread); |
| |
| RegisterMap reg_map(java_thread); |
| frame f = java_thread->last_frame(); |
| vframe* vf = vframe::new_vframe(&f, ®_map, java_thread); |
| frame* last_entry_frame = NULL; |
| int extra_frames = 0; |
| |
| if (java_thread == _oome_thread && _oome_constructor != NULL) { |
| extra_frames++; |
| } |
| while (vf != NULL) { |
| blk.set_frame_number(stack_depth); |
| if (vf->is_java_frame()) { |
| |
| // java frame (interpreted, compiled, ...) |
| javaVFrame *jvf = javaVFrame::cast(vf); |
| if (!(jvf->method()->is_native())) { |
| StackValueCollection* locals = jvf->locals(); |
| for (int slot=0; slot<locals->size(); slot++) { |
| if (locals->at(slot)->type() == T_OBJECT) { |
| oop o = locals->obj_at(slot)(); |
| |
| if (o != NULL) { |
| writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); |
| writer()->write_objectID(o); |
| writer()->write_u4(thread_serial_num); |
| writer()->write_u4((u4) (stack_depth + extra_frames)); |
| } |
| } |
| } |
| StackValueCollection *exprs = jvf->expressions(); |
| for(int index = 0; index < exprs->size(); index++) { |
| if (exprs->at(index)->type() == T_OBJECT) { |
| oop o = exprs->obj_at(index)(); |
| if (o != NULL) { |
| writer()->write_u1(HPROF_GC_ROOT_JAVA_FRAME); |
| writer()->write_objectID(o); |
| writer()->write_u4(thread_serial_num); |
| writer()->write_u4((u4) (stack_depth + extra_frames)); |
| } |
| } |
| } |
| } else { |
| // native frame |
| if (stack_depth == 0) { |
| // JNI locals for the top frame. |
| java_thread->active_handles()->oops_do(&blk); |
| } else { |
| if (last_entry_frame != NULL) { |
| // JNI locals for the entry frame |
| assert(last_entry_frame->is_entry_frame(), "checking"); |
| last_entry_frame->entry_frame_call_wrapper()->handles()->oops_do(&blk); |
| } |
| } |
| } |
| // increment only for Java frames |
| stack_depth++; |
| last_entry_frame = NULL; |
| |
| } else { |
| // externalVFrame - if it's an entry frame then report any JNI locals |
| // as roots when we find the corresponding native javaVFrame |
| frame* fr = vf->frame_pointer(); |
| assert(fr != NULL, "sanity check"); |
| if (fr->is_entry_frame()) { |
| last_entry_frame = fr; |
| } |
| } |
| vf = vf->sender(); |
| } |
| } else { |
| // no last java frame but there may be JNI locals |
| java_thread->active_handles()->oops_do(&blk); |
| } |
| return stack_depth; |
| } |
| |
| |
| // write a HPROF_GC_ROOT_THREAD_OBJ record for each java thread. Then walk |
| // the stack so that locals and JNI locals are dumped. |
| void VM_HeapDumper::do_threads() { |
| for (int i=0; i < _num_threads; i++) { |
| JavaThread* thread = _stack_traces[i]->thread(); |
| oop threadObj = thread->threadObj(); |
| u4 thread_serial_num = i+1; |
| u4 stack_serial_num = thread_serial_num + STACK_TRACE_ID; |
| writer()->write_u1(HPROF_GC_ROOT_THREAD_OBJ); |
| writer()->write_objectID(threadObj); |
| writer()->write_u4(thread_serial_num); // thread number |
| writer()->write_u4(stack_serial_num); // stack trace serial number |
| int num_frames = do_thread(thread, thread_serial_num); |
| assert(num_frames == _stack_traces[i]->get_stack_depth(), |
| "total number of Java frames not matched"); |
| } |
| } |
| |
| |
| // The VM operation that dumps the heap. The dump consists of the following |
| // records: |
| // |
| // HPROF_HEADER |
| // [HPROF_UTF8]* |
| // [HPROF_LOAD_CLASS]* |
| // [[HPROF_FRAME]*|HPROF_TRACE]* |
| // [HPROF_GC_CLASS_DUMP]* |
| // [HPROF_HEAP_DUMP_SEGMENT]* |
| // HPROF_HEAP_DUMP_END |
| // |
| // The HPROF_TRACE records represent the stack traces where the heap dump |
| // is generated and a "dummy trace" record which does not include |
| // any frames. The dummy trace record is used to be referenced as the |
| // unknown object alloc site. |
| // |
| // Each HPROF_HEAP_DUMP_SEGMENT record has a length followed by sub-records. |
| // To allow the heap dump be generated in a single pass we remember the position |
| // of the dump length and fix it up after all sub-records have been written. |
| // To generate the sub-records we iterate over the heap, writing |
| // HPROF_GC_INSTANCE_DUMP, HPROF_GC_OBJ_ARRAY_DUMP, and HPROF_GC_PRIM_ARRAY_DUMP |
| // records as we go. Once that is done we write records for some of the GC |
| // roots. |
| |
| void VM_HeapDumper::doit() { |
| |
| HandleMark hm; |
| CollectedHeap* ch = Universe::heap(); |
| |
| ch->ensure_parsability(false); // must happen, even if collection does |
| // not happen (e.g. due to GCLocker) |
| |
| if (_gc_before_heap_dump) { |
| if (GCLocker::is_active()) { |
| warning("GC locker is held; pre-heapdump GC was skipped"); |
| } else { |
| ch->collect_as_vm_thread(GCCause::_heap_dump); |
| } |
| } |
| |
| // At this point we should be the only dumper active, so |
| // the following should be safe. |
| set_global_dumper(); |
| set_global_writer(); |
| |
| // Write the file header - we always use 1.0.2 |
| size_t used = ch->used(); |
| const char* header = "JAVA PROFILE 1.0.2"; |
| |
| // header is few bytes long - no chance to overflow int |
| writer()->write_raw((void*)header, (int)strlen(header)); |
| writer()->write_u1(0); // terminator |
| writer()->write_u4(oopSize); |
| writer()->write_u8(os::javaTimeMillis()); |
| |
| // HPROF_UTF8 records |
| SymbolTableDumper sym_dumper(writer()); |
| SymbolTable::symbols_do(&sym_dumper); |
| |
| // write HPROF_LOAD_CLASS records |
| ClassLoaderDataGraph::classes_do(&do_load_class); |
| Universe::basic_type_classes_do(&do_load_class); |
| |
| // write HPROF_FRAME and HPROF_TRACE records |
| // this must be called after _klass_map is built when iterating the classes above. |
| dump_stack_traces(); |
| |
| // write HPROF_HEAP_DUMP_SEGMENT |
| DumperSupport::write_dump_header(writer()); |
| |
| // Writes HPROF_GC_CLASS_DUMP records |
| ClassLoaderDataGraph::classes_do(&do_class_dump); |
| Universe::basic_type_classes_do(&do_basic_type_array_class_dump); |
| check_segment_length(); |
| |
| // writes HPROF_GC_INSTANCE_DUMP records. |
| // After each sub-record is written check_segment_length will be invoked |
| // to check if the current segment exceeds a threshold. If so, a new |
| // segment is started. |
| // The HPROF_GC_CLASS_DUMP and HPROF_GC_INSTANCE_DUMP are the vast bulk |
| // of the heap dump. |
| HeapObjectDumper obj_dumper(this, writer()); |
| Universe::heap()->safe_object_iterate(&obj_dumper); |
| |
| // HPROF_GC_ROOT_THREAD_OBJ + frames + jni locals |
| do_threads(); |
| check_segment_length(); |
| |
| // HPROF_GC_ROOT_MONITOR_USED |
| MonitorUsedDumper mon_dumper(writer()); |
| ObjectSynchronizer::oops_do(&mon_dumper); |
| check_segment_length(); |
| |
| // HPROF_GC_ROOT_JNI_GLOBAL |
| JNIGlobalsDumper jni_dumper(writer()); |
| JNIHandles::oops_do(&jni_dumper); |
| check_segment_length(); |
| |
| // HPROF_GC_ROOT_STICKY_CLASS |
| // These should be classes in the NULL class loader data, and not all classes |
| // if !ClassUnloading |
| StickyClassDumper class_dumper(writer()); |
| ClassLoaderData::the_null_class_loader_data()->classes_do(&class_dumper); |
| |
| // fixes up the length of the dump record and writes the HPROF_HEAP_DUMP_END record. |
| DumperSupport::end_of_dump(writer()); |
| |
| // Now we clear the global variables, so that a future dumper might run. |
| clear_global_dumper(); |
| clear_global_writer(); |
| } |
| |
| void VM_HeapDumper::dump_stack_traces() { |
| // write a HPROF_TRACE record without any frames to be referenced as object alloc sites |
| DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4)); |
| writer()->write_u4((u4) STACK_TRACE_ID); |
| writer()->write_u4(0); // thread number |
| writer()->write_u4(0); // frame count |
| |
| _stack_traces = NEW_C_HEAP_ARRAY(ThreadStackTrace*, Threads::number_of_threads(), mtInternal); |
| int frame_serial_num = 0; |
| for (JavaThread* thread = Threads::first(); thread != NULL ; thread = thread->next()) { |
| oop threadObj = thread->threadObj(); |
| if (threadObj != NULL && !thread->is_exiting() && !thread->is_hidden_from_external_view()) { |
| // dump thread stack trace |
| ThreadStackTrace* stack_trace = new ThreadStackTrace(thread, false); |
| stack_trace->dump_stack_at_safepoint(-1); |
| _stack_traces[_num_threads++] = stack_trace; |
| |
| // write HPROF_FRAME records for this thread's stack trace |
| int depth = stack_trace->get_stack_depth(); |
| int thread_frame_start = frame_serial_num; |
| int extra_frames = 0; |
| // write fake frame that makes it look like the thread, which caused OOME, |
| // is in the OutOfMemoryError zero-parameter constructor |
| if (thread == _oome_thread && _oome_constructor != NULL) { |
| int oome_serial_num = _klass_map->find(_oome_constructor->method_holder()); |
| // the class serial number starts from 1 |
| assert(oome_serial_num > 0, "OutOfMemoryError class not found"); |
| DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, oome_serial_num, |
| _oome_constructor, 0); |
| extra_frames++; |
| } |
| for (int j=0; j < depth; j++) { |
| StackFrameInfo* frame = stack_trace->stack_frame_at(j); |
| Method* m = frame->method(); |
| int class_serial_num = _klass_map->find(m->method_holder()); |
| // the class serial number starts from 1 |
| assert(class_serial_num > 0, "class not found"); |
| DumperSupport::dump_stack_frame(writer(), ++frame_serial_num, class_serial_num, m, frame->bci()); |
| } |
| depth += extra_frames; |
| |
| // write HPROF_TRACE record for one thread |
| DumperSupport::write_header(writer(), HPROF_TRACE, 3*sizeof(u4) + depth*oopSize); |
| int stack_serial_num = _num_threads + STACK_TRACE_ID; |
| writer()->write_u4(stack_serial_num); // stack trace serial number |
| writer()->write_u4((u4) _num_threads); // thread serial number |
| writer()->write_u4(depth); // frame count |
| for (int j=1; j <= depth; j++) { |
| writer()->write_id(thread_frame_start + j); |
| } |
| } |
| } |
| } |
| |
| // dump the heap to given path. |
| int HeapDumper::dump(const char* path) { |
| assert(path != NULL && strlen(path) > 0, "path missing"); |
| |
| // print message in interactive case |
| if (print_to_tty()) { |
| tty->print_cr("Dumping heap to %s ...", path); |
| timer()->start(); |
| } |
| |
| // create the dump writer. If the file can be opened then bail |
| DumpWriter writer(path); |
| if (!writer.is_open()) { |
| set_error(writer.error()); |
| if (print_to_tty()) { |
| tty->print_cr("Unable to create %s: %s", path, |
| (error() != NULL) ? error() : "reason unknown"); |
| } |
| return -1; |
| } |
| |
| // generate the dump |
| VM_HeapDumper dumper(&writer, _gc_before_heap_dump, _oome); |
| if (Thread::current()->is_VM_thread()) { |
| assert(SafepointSynchronize::is_at_safepoint(), "Expected to be called at a safepoint"); |
| dumper.doit(); |
| } else { |
| VMThread::execute(&dumper); |
| } |
| |
| // close dump file and record any error that the writer may have encountered |
| writer.close(); |
| set_error(writer.error()); |
| |
| // print message in interactive case |
| if (print_to_tty()) { |
| timer()->stop(); |
| if (error() == NULL) { |
| tty->print_cr("Heap dump file created [" JULONG_FORMAT " bytes in %3.3f secs]", |
| writer.bytes_written(), timer()->seconds()); |
| } else { |
| tty->print_cr("Dump file is incomplete: %s", writer.error()); |
| } |
| } |
| |
| return (writer.error() == NULL) ? 0 : -1; |
| } |
| |
| // stop timer (if still active), and free any error string we might be holding |
| HeapDumper::~HeapDumper() { |
| if (timer()->is_active()) { |
| timer()->stop(); |
| } |
| set_error(NULL); |
| } |
| |
| |
| // returns the error string (resource allocated), or NULL |
| char* HeapDumper::error_as_C_string() const { |
| if (error() != NULL) { |
| char* str = NEW_RESOURCE_ARRAY(char, strlen(error())+1); |
| strcpy(str, error()); |
| return str; |
| } else { |
| return NULL; |
| } |
| } |
| |
| // set the error string |
| void HeapDumper::set_error(char* error) { |
| if (_error != NULL) { |
| os::free(_error); |
| } |
| if (error == NULL) { |
| _error = NULL; |
| } else { |
| _error = os::strdup(error); |
| assert(_error != NULL, "allocation failure"); |
| } |
| } |
| |
| // Called by out-of-memory error reporting by a single Java thread |
| // outside of a JVM safepoint |
| void HeapDumper::dump_heap_from_oome() { |
| HeapDumper::dump_heap(true); |
| } |
| |
| // Called by error reporting by a single Java thread outside of a JVM safepoint, |
| // or by heap dumping by the VM thread during a (GC) safepoint. Thus, these various |
| // callers are strictly serialized and guaranteed not to interfere below. For more |
| // general use, however, this method will need modification to prevent |
| // inteference when updating the static variables base_path and dump_file_seq below. |
| void HeapDumper::dump_heap() { |
| HeapDumper::dump_heap(false); |
| } |
| |
| void HeapDumper::dump_heap(bool oome) { |
| static char base_path[JVM_MAXPATHLEN] = {'\0'}; |
| static uint dump_file_seq = 0; |
| char* my_path; |
| const int max_digit_chars = 20; |
| |
| const char* dump_file_name = "java_pid"; |
| const char* dump_file_ext = ".hprof"; |
| |
| // The dump file defaults to java_pid<pid>.hprof in the current working |
| // directory. HeapDumpPath=<file> can be used to specify an alternative |
| // dump file name or a directory where dump file is created. |
| if (dump_file_seq == 0) { // first time in, we initialize base_path |
| // Calculate potentially longest base path and check if we have enough |
| // allocated statically. |
| const size_t total_length = |
| (HeapDumpPath == NULL ? 0 : strlen(HeapDumpPath)) + |
| strlen(os::file_separator()) + max_digit_chars + |
| strlen(dump_file_name) + strlen(dump_file_ext) + 1; |
| if (total_length > sizeof(base_path)) { |
| warning("Cannot create heap dump file. HeapDumpPath is too long."); |
| return; |
| } |
| |
| bool use_default_filename = true; |
| if (HeapDumpPath == NULL || HeapDumpPath[0] == '\0') { |
| // HeapDumpPath=<file> not specified |
| } else { |
| strcpy(base_path, HeapDumpPath); |
| // check if the path is a directory (must exist) |
| DIR* dir = os::opendir(base_path); |
| if (dir == NULL) { |
| use_default_filename = false; |
| } else { |
| // HeapDumpPath specified a directory. We append a file separator |
| // (if needed). |
| os::closedir(dir); |
| size_t fs_len = strlen(os::file_separator()); |
| if (strlen(base_path) >= fs_len) { |
| char* end = base_path; |
| end += (strlen(base_path) - fs_len); |
| if (strcmp(end, os::file_separator()) != 0) { |
| strcat(base_path, os::file_separator()); |
| } |
| } |
| } |
| } |
| // If HeapDumpPath wasn't a file name then we append the default name |
| if (use_default_filename) { |
| const size_t dlen = strlen(base_path); // if heap dump dir specified |
| jio_snprintf(&base_path[dlen], sizeof(base_path)-dlen, "%s%d%s", |
| dump_file_name, os::current_process_id(), dump_file_ext); |
| } |
| const size_t len = strlen(base_path) + 1; |
| my_path = (char*)os::malloc(len, mtInternal); |
| if (my_path == NULL) { |
| warning("Cannot create heap dump file. Out of system memory."); |
| return; |
| } |
| strncpy(my_path, base_path, len); |
| } else { |
| // Append a sequence number id for dumps following the first |
| const size_t len = strlen(base_path) + max_digit_chars + 2; // for '.' and \0 |
| my_path = (char*)os::malloc(len, mtInternal); |
| if (my_path == NULL) { |
| warning("Cannot create heap dump file. Out of system memory."); |
| return; |
| } |
| jio_snprintf(my_path, len, "%s.%d", base_path, dump_file_seq); |
| } |
| dump_file_seq++; // increment seq number for next time we dump |
| |
| HeapDumper dumper(false /* no GC before heap dump */, |
| true /* send to tty */, |
| oome /* pass along out-of-memory-error flag */); |
| dumper.dump(my_path); |
| os::free(my_path); |
| } |