/
heapDumper.cpp
2101 lines (1833 loc) · 70.3 KB
/
heapDumper.cpp
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/*
* Copyright (c) 2005, 2021, 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 "jvm.h"
#include "classfile/classLoaderData.inline.hpp"
#include "classfile/classLoaderDataGraph.hpp"
#include "classfile/javaClasses.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "classfile/vmClasses.hpp"
#include "classfile/vmSymbols.hpp"
#include "gc/shared/gcLocker.hpp"
#include "gc/shared/gcVMOperations.hpp"
#include "gc/shared/workgroup.hpp"
#include "jfr/jfrEvents.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/resourceArea.hpp"
#include "memory/universe.hpp"
#include "oops/klass.inline.hpp"
#include "oops/objArrayKlass.hpp"
#include "oops/objArrayOop.inline.hpp"
#include "oops/oop.inline.hpp"
#include "oops/typeArrayOop.inline.hpp"
#include "runtime/frame.inline.hpp"
#include "runtime/handles.inline.hpp"
#include "runtime/javaCalls.hpp"
#include "runtime/jniHandles.hpp"
#include "runtime/os.hpp"
#include "runtime/reflectionUtils.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadSMR.hpp"
#include "runtime/vframe.hpp"
#include "runtime/vmThread.hpp"
#include "runtime/vmOperations.hpp"
#include "services/heapDumper.hpp"
#include "services/heapDumperCompression.hpp"
#include "services/threadService.hpp"
#include "utilities/macros.hpp"
#include "utilities/ostream.hpp"
/*
* 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 for a dump
class DumpWriter : public StackObj {
private:
enum {
io_buffer_max_size = 1*M,
io_buffer_max_waste = 10*K,
dump_segment_header_size = 9
};
char* _buffer; // internal buffer
size_t _size;
size_t _pos;
bool _in_dump_segment; // Are we currently in a dump segment?
bool _is_huge_sub_record; // Are we writing a sub-record larger than the buffer size?
DEBUG_ONLY(size_t _sub_record_left;) // The bytes not written for the current sub-record.
DEBUG_ONLY(bool _sub_record_ended;) // True if we have called the end_sub_record().
CompressionBackend _backend; // Does the actual writing.
void flush();
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; }
// Can be called if we have enough room in the buffer.
void write_fast(void* s, size_t len);
// Returns true if we have enough room in the buffer for 'len' bytes.
bool can_write_fast(size_t len);
public:
// Takes ownership of the writer and compressor.
DumpWriter(AbstractWriter* writer, AbstractCompressor* compressor);
~DumpWriter();
// total number of bytes written to the disk
julong bytes_written() const { return (julong) _backend.get_written(); }
char const* error() const { return _backend.error(); }
// writer functions
void write_raw(void* s, size_t len);
void write_u1(u1 x);
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);
// Start a new sub-record. Starts a new heap dump segment if needed.
void start_sub_record(u1 tag, u4 len);
// Ends the current sub-record.
void end_sub_record();
// Finishes the current dump segment if not already finished.
void finish_dump_segment();
// Called by threads used for parallel writing.
void writer_loop() { _backend.thread_loop(); }
// Called when finished to release the threads.
void deactivate() { flush(); _backend.deactivate(); }
};
// Check for error after constructing the object and destroy it in case of an error.
DumpWriter::DumpWriter(AbstractWriter* writer, AbstractCompressor* compressor) :
_buffer(NULL),
_size(0),
_pos(0),
_in_dump_segment(false),
_backend(writer, compressor, io_buffer_max_size, io_buffer_max_waste) {
flush();
}
DumpWriter::~DumpWriter() {
flush();
}
void DumpWriter::write_fast(void* s, size_t len) {
assert(!_in_dump_segment || (_sub_record_left >= len), "sub-record too large");
assert(buffer_size() - position() >= len, "Must fit");
debug_only(_sub_record_left -= len);
memcpy(buffer() + position(), s, len);
set_position(position() + len);
}
bool DumpWriter::can_write_fast(size_t len) {
return buffer_size() - position() >= len;
}
// write raw bytes
void DumpWriter::write_raw(void* s, size_t len) {
assert(!_in_dump_segment || (_sub_record_left >= len), "sub-record too large");
debug_only(_sub_record_left -= len);
// flush buffer to make room.
while (len > buffer_size() - position()) {
assert(!_in_dump_segment || _is_huge_sub_record,
"Cannot overflow in non-huge sub-record.");
size_t to_write = buffer_size() - position();
memcpy(buffer() + position(), s, to_write);
s = (void*) ((char*) s + to_write);
len -= to_write;
set_position(position() + to_write);
flush();
}
memcpy(buffer() + position(), s, len);
set_position(position() + len);
}
// flush any buffered bytes to the file
void DumpWriter::flush() {
_backend.get_new_buffer(&_buffer, &_pos, &_size);
}
// Makes sure we inline the fast write into the write_u* functions. This is a big speedup.
#define WRITE_KNOWN_TYPE(p, len) do { if (can_write_fast((len))) write_fast((p), (len)); \
else write_raw((p), (len)); } while (0)
void DumpWriter::write_u1(u1 x) {
WRITE_KNOWN_TYPE((void*) &x, 1);
}
void DumpWriter::write_u2(u2 x) {
u2 v;
Bytes::put_Java_u2((address)&v, x);
WRITE_KNOWN_TYPE((void*)&v, 2);
}
void DumpWriter::write_u4(u4 x) {
u4 v;
Bytes::put_Java_u4((address)&v, x);
WRITE_KNOWN_TYPE((void*)&v, 4);
}
void DumpWriter::write_u8(u8 x) {
u8 v;
Bytes::put_Java_u8((address)&v, x);
WRITE_KNOWN_TYPE((void*)&v, 8);
}
void DumpWriter::write_objectID(oop o) {
address a = cast_from_oop<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());
}
void DumpWriter::finish_dump_segment() {
if (_in_dump_segment) {
assert(_sub_record_left == 0, "Last sub-record not written completely");
assert(_sub_record_ended, "sub-record must have ended");
// Fix up the dump segment length if we haven't written a huge sub-record last
// (in which case the segment length was already set to the correct value initially).
if (!_is_huge_sub_record) {
assert(position() > dump_segment_header_size, "Dump segment should have some content");
Bytes::put_Java_u4((address) (buffer() + 5),
(u4) (position() - dump_segment_header_size));
}
flush();
_in_dump_segment = false;
}
}
void DumpWriter::start_sub_record(u1 tag, u4 len) {
if (!_in_dump_segment) {
if (position() > 0) {
flush();
}
assert(position() == 0, "Must be at the start");
write_u1(HPROF_HEAP_DUMP_SEGMENT);
write_u4(0); // timestamp
// Will be fixed up later if we add more sub-records. If this is a huge sub-record,
// this is already the correct length, since we don't add more sub-records.
write_u4(len);
_in_dump_segment = true;
_is_huge_sub_record = len > buffer_size() - dump_segment_header_size;
} else if (_is_huge_sub_record || (len > buffer_size() - position())) {
// This object will not fit in completely or the last sub-record was huge.
// Finish the current segement and try again.
finish_dump_segment();
start_sub_record(tag, len);
return;
}
debug_only(_sub_record_left = len);
debug_only(_sub_record_ended = false);
write_u1(tag);
}
void DumpWriter::end_sub_record() {
assert(_in_dump_segment, "must be in dump segment");
assert(_sub_record_left == 0, "sub-record not written completely");
assert(!_sub_record_ended, "Must not have ended yet");
debug_only(_sub_record_ended = true);
}
// 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 data to write.
static u4 sig2size(Symbol* sig);
// 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, oop obj, int offset);
// returns the size of the static fields; also counts the static fields
static u4 get_static_fields_size(InstanceKlass* ik, u2& field_count);
// 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);
// get the count of the instance fields for a given class
static u2 get_instance_fields_count(InstanceKlass* ik);
// 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);
// fixes up the current dump record and writes HPROF_HEAP_DUMP_END record
static void end_of_dump(DumpWriter* writer);
static oop mask_dormant_archived_object(oop o) {
if (o != NULL && o->klass()->java_mirror() == NULL) {
// Ignore this object since the corresponding java mirror is not loaded.
// Might be a dormant archive object.
return NULL;
} else {
return o;
}
}
};
// 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->char_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;
}
}
u4 DumperSupport::sig2size(Symbol* sig) {
switch (sig->char_at(0)) {
case JVM_SIGNATURE_CLASS:
case JVM_SIGNATURE_ARRAY: return sizeof(address);
case JVM_SIGNATURE_BOOLEAN:
case JVM_SIGNATURE_BYTE: return 1;
case JVM_SIGNATURE_SHORT:
case JVM_SIGNATURE_CHAR: return 2;
case JVM_SIGNATURE_INT:
case JVM_SIGNATURE_FLOAT: return 4;
case JVM_SIGNATURE_LONG:
case JVM_SIGNATURE_DOUBLE: return 8;
default: ShouldNotReachHere(); /* to shut up compiler */ return 0;
}
}
// 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, oop obj, int offset) {
switch (type) {
case JVM_SIGNATURE_CLASS :
case JVM_SIGNATURE_ARRAY : {
oop o = obj->obj_field_access<ON_UNKNOWN_OOP_REF | AS_NO_KEEPALIVE>(offset);
if (o != NULL && log_is_enabled(Debug, cds, heap) && mask_dormant_archived_object(o) == NULL) {
ResourceMark rm;
log_debug(cds, heap)("skipped dormant archived object " INTPTR_FORMAT " (%s) referenced by " INTPTR_FORMAT " (%s)",
p2i(o), o->klass()->external_name(),
p2i(obj), obj->klass()->external_name());
}
o = mask_dormant_archived_object(o);
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 = obj->byte_field(offset);
writer->write_u1((u1)b);
break;
}
case JVM_SIGNATURE_CHAR : {
jchar c = obj->char_field(offset);
writer->write_u2((u2)c);
break;
}
case JVM_SIGNATURE_SHORT : {
jshort s = obj->short_field(offset);
writer->write_u2((u2)s);
break;
}
case JVM_SIGNATURE_FLOAT : {
jfloat f = obj->float_field(offset);
dump_float(writer, f);
break;
}
case JVM_SIGNATURE_DOUBLE : {
jdouble d = obj->double_field(offset);
dump_double(writer, d);
break;
}
case JVM_SIGNATURE_INT : {
jint i = obj->int_field(offset);
writer->write_u4((u4)i);
break;
}
case JVM_SIGNATURE_LONG : {
jlong l = obj->long_field(offset);
writer->write_u8((u8)l);
break;
}
case JVM_SIGNATURE_BOOLEAN : {
jboolean b = obj->bool_field(offset);
writer->write_u1((u1)b);
break;
}
default : {
ShouldNotReachHere();
break;
}
}
}
// returns the size of the instance of the given class
u4 DumperSupport::instance_size(Klass* k) {
InstanceKlass* ik = InstanceKlass::cast(k);
u4 size = 0;
for (FieldStream fld(ik, false, false); !fld.eos(); fld.next()) {
if (!fld.access_flags().is_static()) {
size += sig2size(fld.signature());
}
}
return size;
}
u4 DumperSupport::get_static_fields_size(InstanceKlass* ik, u2& field_count) {
field_count = 0;
u4 size = 0;
for (FieldStream fldc(ik, true, true); !fldc.eos(); fldc.next()) {
if (fldc.access_flags().is_static()) {
field_count++;
size += sig2size(fldc.signature());
}
}
// Add in resolved_references which is referenced by the cpCache
// The resolved_references is an array per InstanceKlass holding the
// strings and other oops resolved from the constant pool.
oop resolved_references = ik->constants()->resolved_references_or_null();
if (resolved_references != NULL) {
field_count++;
size += sizeof(address);
// Add in the resolved_references of the used previous versions of the class
// in the case of RedefineClasses
InstanceKlass* prev = ik->previous_versions();
while (prev != NULL && prev->constants()->resolved_references_or_null() != NULL) {
field_count++;
size += sizeof(address);
prev = prev->previous_versions();
}
}
// Also provide a pointer to the init_lock if present, so there aren't unreferenced int[0]
// arrays.
oop init_lock = ik->init_lock();
if (init_lock != NULL) {
field_count++;
size += sizeof(address);
}
// We write the value itself plus a name and a one byte type tag per field.
return size + field_count * (sizeof(address) + 1);
}
// dumps static fields of the given class
void DumperSupport::dump_static_fields(DumpWriter* writer, Klass* k) {
InstanceKlass* ik = InstanceKlass::cast(k);
// 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
dump_field_value(writer, sig->char_at(0), ik->java_mirror(), fld.offset());
}
}
// Add resolved_references for each class that has them
oop resolved_references = ik->constants()->resolved_references_or_null();
if (resolved_references != NULL) {
writer->write_symbolID(vmSymbols::resolved_references_name()); // name
writer->write_u1(sig2tag(vmSymbols::object_array_signature())); // type
writer->write_objectID(resolved_references);
// Also write any previous versions
InstanceKlass* prev = ik->previous_versions();
while (prev != NULL && prev->constants()->resolved_references_or_null() != NULL) {
writer->write_symbolID(vmSymbols::resolved_references_name()); // name
writer->write_u1(sig2tag(vmSymbols::object_array_signature())); // type
writer->write_objectID(prev->constants()->resolved_references());
prev = prev->previous_versions();
}
}
// Add init lock to the end if the class is not yet initialized
oop init_lock = ik->init_lock();
if (init_lock != NULL) {
writer->write_symbolID(vmSymbols::init_lock_name()); // name
writer->write_u1(sig2tag(vmSymbols::int_array_signature())); // type
writer->write_objectID(init_lock);
}
}
// dump the raw values of the instance fields of the given object
void DumperSupport::dump_instance_fields(DumpWriter* writer, oop o) {
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();
dump_field_value(writer, sig->char_at(0), o, fld.offset());
}
}
}
// dumps the definition of the instance fields for a given class
u2 DumperSupport::get_instance_fields_count(InstanceKlass* ik) {
u2 field_count = 0;
for (FieldStream fldc(ik, true, true); !fldc.eos(); fldc.next()) {
if (!fldc.access_flags().is_static()) field_count++;
}
return field_count;
}
// dumps the definition of the instance fields for a given class
void DumperSupport::dump_instance_field_descriptors(DumpWriter* writer, Klass* k) {
InstanceKlass* ik = InstanceKlass::cast(k);
// 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) {
InstanceKlass* ik = InstanceKlass::cast(o->klass());
u4 is = instance_size(ik);
u4 size = 1 + sizeof(address) + 4 + sizeof(address) + 4 + is;
writer->start_sub_record(HPROF_GC_INSTANCE_DUMP, size);
writer->write_objectID(o);
writer->write_u4(STACK_TRACE_ID);
// class ID
writer->write_classID(ik);
// number of bytes that follow
writer->write_u4(is);
// field values
dump_instance_fields(writer, o);
writer->end_sub_record();
}
// 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;
}