archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-21 19:44:41 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

8210289: ArchivedKlassSubGraphInfoRecord is incomplete

Browse source 
Reviewed-by: jiangli, ccheung
This commit is contained in:
Ioi Lam 2018-09-05 18:14:45 -07:00
parent 891765ee5e
commit e80b128db4
3 changed files with 368 additions and 154 deletions
Download patch file Download diff file Expand all files Collapse all files

453
src/hotspot/share/memory/heapShared.cpp
View file

@ -45,8 +45,6 @@ KlassSubGraphInfo* HeapShared::_subgraph_info_list = NULL;
int HeapShared::_num_archived_subgraph_info_records = 0;
Array<ArchivedKlassSubGraphInfoRecord>* HeapShared::_archived_subgraph_info_records = NULL;
// Currently there is only one class mirror (ArchivedModuleGraph) with archived
// sub-graphs.
KlassSubGraphInfo* HeapShared::find_subgraph_info(Klass* k) {
KlassSubGraphInfo* info = _subgraph_info_list;
while (info != NULL) {
@ -145,6 +143,13 @@ void KlassSubGraphInfo::add_subgraph_object_klass(Klass* orig_k, Klass *relocate
return;
}
if (log_is_enabled(Debug, cds, heap)) {
if (!_subgraph_object_klasses->contains(relocated_k)) {
ResourceMark rm;
log_debug(cds, heap)("Adding klass %s", orig_k->external_name());
}
}
_subgraph_object_klasses->append_if_missing(relocated_k);
}
@ -153,7 +158,7 @@ void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
_k = info->klass();
_next = NULL;
_entry_field_records = NULL;
_subgraph_klasses = NULL;
_subgraph_object_klasses = NULL;
// populate the entry fields
GrowableArray<juint>* entry_fields = info->subgraph_entry_fields();
@ -168,20 +173,20 @@ void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
}
// the Klasses of the objects in the sub-graphs
GrowableArray<Klass*>* subgraph_klasses = info->subgraph_object_klasses();
if (subgraph_klasses != NULL) {
int num_subgraphs_klasses = subgraph_klasses->length();
_subgraph_klasses =
GrowableArray<Klass*>* subgraph_object_klasses = info->subgraph_object_klasses();
if (subgraph_object_klasses != NULL) {
int num_subgraphs_klasses = subgraph_object_klasses->length();
_subgraph_object_klasses =
MetaspaceShared::new_ro_array<Klass*>(num_subgraphs_klasses);
for (int i = 0; i < num_subgraphs_klasses; i++) {
Klass* subgraph_k = subgraph_klasses->at(i);
Klass* subgraph_k = subgraph_object_klasses->at(i);
if (log_is_enabled(Info, cds, heap)) {
ResourceMark rm;
log_info(cds, heap)(
"Archived object klass (%d): %s in %s sub-graphs",
i, subgraph_k->external_name(), _k->external_name());
"Archived object klass %s (%2d) => %s",
_k->external_name(), i, subgraph_k->external_name());
}
_subgraph_klasses->at_put(i, subgraph_k);
_subgraph_object_klasses->at_put(i, subgraph_k);
}
}
}
@ -194,8 +199,7 @@ void ArchivedKlassSubGraphInfoRecord::init(KlassSubGraphInfo* info) {
// - A list of klasses that need to be loaded/initialized before archived
// java object sub-graph can be accessed at runtime.
//
// The records are saved in the archive file and reloaded at runtime. Currently
// there is only one class mirror (ArchivedModuleGraph) with archived sub-graphs.
// The records are saved in the archive file and reloaded at runtime.
//
// Layout of the archived subgraph info records:
//
@ -273,9 +277,8 @@ void HeapShared::initialize_from_archived_subgraph(Klass* k) {
return; // no subgraph info records
}
// Initialize from archived data. Currently only ArchivedModuleGraph
// has archived object subgraphs, which is used during VM initialization
// time when bootstraping the system modules. No lock is needed.
// Initialize from archived data. Currently this is done only
// during VM initialization time. No lock is needed.
Thread* THREAD = Thread::current();
for (int i = 0; i < _archived_subgraph_info_records->length(); i++) {
ArchivedKlassSubGraphInfoRecord* record = _archived_subgraph_info_records->adr_at(i);
@ -284,7 +287,7 @@ void HeapShared::initialize_from_archived_subgraph(Klass* k) {
// Found the archived subgraph info record for the requesting klass.
// Load/link/initialize the klasses of the objects in the subgraph.
// NULL class loader is used.
Array<Klass*>* klasses = record->subgraph_klasses();
Array<Klass*>* klasses = record->subgraph_object_klasses();
if (klasses != NULL) {
for (i = 0; i < klasses->length(); i++) {
Klass* obj_k = klasses->at(i);
@ -339,15 +342,19 @@ void HeapShared::initialize_from_archived_subgraph(Klass* k) {
class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
int _level;
bool _record_klasses_only;
KlassSubGraphInfo* _subgraph_info;
oop _orig_referencing_obj;
oop _archived_referencing_obj;
Thread* _thread;
public:
WalkOopAndArchiveClosure(int level, KlassSubGraphInfo* subgraph_info,
oop orig, oop archived) : _level(level),
_subgraph_info(subgraph_info),
_orig_referencing_obj(orig),
_archived_referencing_obj(archived) {}
WalkOopAndArchiveClosure(int level, bool record_klasses_only,
KlassSubGraphInfo* subgraph_info,
oop orig, oop archived, TRAPS) :
_level(level), _record_klasses_only(record_klasses_only),
_subgraph_info(subgraph_info),
_orig_referencing_obj(orig), _archived_referencing_obj(archived),
_thread(THREAD) {}
void do_oop(narrowOop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
void do_oop( oop *p) { WalkOopAndArchiveClosure::do_oop_work(p); }
@ -355,89 +362,105 @@ class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
template <class T> void do_oop_work(T *p) {
oop obj = RawAccess<>::oop_load(p);
if (!CompressedOops::is_null(obj)) {
// A java.lang.Class instance can not be included in an archived
// object sub-graph.
if (java_lang_Class::is_instance(obj)) {
log_error(cds, heap)("Unknown java.lang.Class object is in the archived sub-graph\n");
vm_exit(1);
}
assert(!MetaspaceShared::is_archive_object(obj),
"original objects must not point to archived objects");
LogTarget(Debug, cds, heap) log;
LogStream ls(log);
outputStream* out = &ls;
{
ResourceMark rm;
log.print("(%d) %s <--- referenced from: %s",
_level, obj->klass()->external_name(),
CompressedOops::is_null(_orig_referencing_obj) ?
"" : _orig_referencing_obj->klass()->external_name());
obj->print_on(out);
}
if (MetaspaceShared::is_archive_object(obj)) {
// The current oop is an archived oop, nothing needs to be done
log.print("--- object is already archived ---");
return;
}
size_t field_delta = pointer_delta(
p, _orig_referencing_obj, sizeof(char));
size_t field_delta = pointer_delta(p, _orig_referencing_obj, sizeof(char));
T* new_p = (T*)(address(_archived_referencing_obj) + field_delta);
oop archived = MetaspaceShared::find_archived_heap_object(obj);
if (archived != NULL) {
// There is an archived copy existing, update reference to point
// to the archived copy
RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
log.print(
"--- found existing archived copy, store archived " PTR_FORMAT " in " PTR_FORMAT,
p2i(archived), p2i(new_p));
return;
}
Thread* THREAD = _thread;
int l = _level + 1;
Thread* THREAD = Thread::current();
// Archive the current oop before iterating through its references
archived = MetaspaceShared::archive_heap_object(obj, THREAD);
if (archived == NULL) {
if (!_record_klasses_only && log_is_enabled(Debug, cds, heap)) {
ResourceMark rm;
LogTarget(Error, cds, heap) log_err;
LogStream ls_err(log_err);
outputStream* out_err = &ls_err;
log_err.print("Failed to archive %s object ("
PTR_FORMAT "), size[" SIZE_FORMAT "] in sub-graph",
obj->klass()->external_name(), p2i(obj), (size_t)obj->size());
obj->print_on(out_err);
vm_exit(1);
log_debug(cds, heap)("(%d) %s[" SIZE_FORMAT "] ==> " PTR_FORMAT " size %d %s", _level,
_orig_referencing_obj->klass()->external_name(), field_delta,
p2i(obj), obj->size() * HeapWordSize, obj->klass()->external_name());
LogTarget(Trace, cds, heap) log;
LogStream out(log);
obj->print_on(&out);
}
assert(MetaspaceShared::is_archive_object(archived), "must be archived");
log.print("=== archiving oop " PTR_FORMAT " ==> " PTR_FORMAT,
p2i(obj), p2i(archived));
// Following the references in the current oop and archive any
// encountered objects during the process
WalkOopAndArchiveClosure walker(l, _subgraph_info, obj, archived);
obj->oop_iterate(&walker);
oop archived = HeapShared::archive_reachable_objects_from(_level + 1, _subgraph_info, obj, THREAD);
assert(archived != NULL, "VM should have exited with unarchivable objects for _level > 1");
assert(MetaspaceShared::is_archive_object(archived), "must be");
// Update the reference in the archived copy of the referencing object
RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
log.print("=== store archived " PTR_FORMAT " in " PTR_FORMAT,
p2i(archived), p2i(new_p));
// Add the klass to the list of classes that need to be loaded before
// module system initialization
Klass *orig_k = obj->klass();
Klass *relocated_k = archived->klass();
_subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
if (!_record_klasses_only) {
// Update the reference in the archived copy of the referencing object.
log_debug(cds, heap)("(%d) updating oop @[" PTR_FORMAT "] " PTR_FORMAT " ==> " PTR_FORMAT,
_level, p2i(new_p), p2i(obj), p2i(archived));
RawAccess<IS_NOT_NULL>::oop_store(new_p, archived);
}
}
}
};
// (1) If orig_obj has not been archived yet, archive it.
// (2) If orig_obj has not been seen yet (since start_recording_subgraph() was called),
// trace all objects that are reachable from it, and make sure these objects are archived.
// (3) Record the klasses of all orig_obj and all reachable objects.
oop HeapShared::archive_reachable_objects_from(int level, KlassSubGraphInfo* subgraph_info, oop orig_obj, TRAPS) {
assert(orig_obj != NULL, "must be");
assert(!MetaspaceShared::is_archive_object(orig_obj), "sanity");
// java.lang.Class instances cannot be included in an archived
// object sub-graph.
if (java_lang_Class::is_instance(orig_obj)) {
log_error(cds, heap)("(%d) Unknown java.lang.Class object is in the archived sub-graph", level);
vm_exit(1);
}
oop archived_obj = MetaspaceShared::find_archived_heap_object(orig_obj);
if (java_lang_String::is_instance(orig_obj) && archived_obj != NULL) {
// To save time, don't walk strings that are already archived. They just contain
// pointers to a type array, whose klass doesn't need to be recorded.
return archived_obj;
}
if (has_been_seen_during_subgraph_recording(orig_obj)) {
// orig_obj has already been archived and traced. Nothing more to do.
return archived_obj;
} else {
set_has_been_seen_during_subgraph_recording(orig_obj);
}
bool record_klasses_only = (archived_obj != NULL);
if (archived_obj == NULL) {
++_num_new_archived_objs;
archived_obj = MetaspaceShared::archive_heap_object(orig_obj, THREAD);
if (archived_obj == NULL) {
// Skip archiving the sub-graph referenced from the current entry field.
ResourceMark rm;
log_error(cds, heap)(
"Cannot archive the sub-graph referenced from %s object ("
PTR_FORMAT ") size %d, skipped.",
orig_obj->klass()->external_name(), p2i(orig_obj), orig_obj->size() * HeapWordSize);
if (level == 1) {
// Don't archive a subgraph root that's too big. For archives static fields, that's OK
// as the Java code will take care of initializing this field dynamically.
return NULL;
} else {
// We don't know how to handle an object that has been archived, but some of its reachable
// objects cannot be archived. Bail out for now. We might need to fix this in the future if
// we have a real use case.
vm_exit(1);
}
}
}
assert(archived_obj != NULL, "must be");
Klass *orig_k = orig_obj->klass();
Klass *relocated_k = archived_obj->klass();
subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
WalkOopAndArchiveClosure walker(level, record_klasses_only, subgraph_info, orig_obj, archived_obj, THREAD);
orig_obj->oop_iterate(&walker);
return archived_obj;
}
//
// Start from the given static field in a java mirror and archive the
// complete sub-graph of java heap objects that are reached directly
// or indirectly from the starting object by following references.
// Currently, only ArchivedModuleGraph class instance (mirror) has archived
// object subgraphs. Sub-graph archiving restrictions (current):
// Sub-graph archiving restrictions (current):
//
// - All classes of objects in the archived sub-graph (including the
// entry class) must be boot class only.
@ -461,20 +484,19 @@ class WalkOopAndArchiveClosure: public BasicOopIterateClosure {
// archive the sub-graph of objects starting from each reference.
//
// 4) Updates the pointer in the archived copy of referencing object to
// point to the current archived object.
// point to the current archived object.
//
// 5) The Klass of the current java object is added to the list of Klasses
// for loading and initialzing before any object in the archived graph can
// be accessed at runtime.
//
void HeapShared::archive_reachable_objects_from_static_field(Klass *k,
void HeapShared::archive_reachable_objects_from_static_field(InstanceKlass *k,
const char* klass_name,
int field_offset,
BasicType field_type,
const char* field_name,
TRAPS) {
assert(DumpSharedSpaces, "dump time only");
assert(k->is_instance_klass(), "sanity");
assert(InstanceKlass::cast(k)->is_shared_boot_class(),
"must be boot class");
assert(k->is_shared_boot_class(), "must be boot class");
oop m = k->java_mirror();
oop archived_m = MetaspaceShared::find_archived_heap_object(m);
@ -482,58 +504,160 @@ void HeapShared::archive_reachable_objects_from_static_field(Klass *k,
return;
}
if (field_type == T_OBJECT || field_type == T_ARRAY) {
// obtain k's subGraph Info
KlassSubGraphInfo* subgraph_info = get_subgraph_info(k);
KlassSubGraphInfo* subgraph_info = get_subgraph_info(k);
oop f = m->obj_field(field_offset);
// get the object referenced by the field
oop f = m->obj_field(field_offset);
if (!CompressedOops::is_null(f)) {
LogTarget(Debug, cds, heap) log;
LogStream ls(log);
outputStream* out = &ls;
log.print("Start from: ");
f->print_on(out);
log_debug(cds, heap)("Start archiving from: %s::%s (" PTR_FORMAT ")", klass_name, field_name, p2i(f));
// get the archived copy of the field referenced object
oop af = MetaspaceShared::archive_heap_object(f, THREAD);
if (af == NULL) {
// Skip archiving the sub-graph referenced from the current entry field.
ResourceMark rm;
log_info(cds, heap)(
"Cannot archive the sub-graph referenced from %s object ("
PTR_FORMAT ") size[" SIZE_FORMAT "], skipped.",
f->klass()->external_name(), p2i(f), (size_t)f->size());
return;
}
if (!MetaspaceShared::is_archive_object(f)) {
WalkOopAndArchiveClosure walker(1, subgraph_info, f, af);
f->oop_iterate(&walker);
}
if (!CompressedOops::is_null(f)) {
if (log_is_enabled(Trace, cds, heap)) {
LogTarget(Trace, cds, heap) log;
LogStream out(log);
f->print_on(&out);
}
// The field value is not preserved in the archived mirror.
oop af = archive_reachable_objects_from(1, subgraph_info, f, CHECK);
if (af == NULL) {
log_error(cds, heap)("Archiving failed %s::%s (some reachable objects cannot be archived)",
klass_name, field_name);
} else {
// Note: the field value is not preserved in the archived mirror.
// Record the field as a new subGraph entry point. The recorded
// information is restored from the archive at runtime.
subgraph_info->add_subgraph_entry_field(field_offset, af);
Klass *relocated_k = af->klass();
Klass *orig_k = f->klass();
subgraph_info->add_subgraph_object_klass(orig_k, relocated_k);
ResourceMark rm;
log_info(cds, heap)(
"Archived the sub-graph referenced from %s object " PTR_FORMAT,
f->klass()->external_name(), p2i(f));
} else {
// The field contains null, we still need to record the entry point,
// so it can be restored at runtime.
subgraph_info->add_subgraph_entry_field(field_offset, NULL);
log_info(cds, heap)("Archived field %s::%s => " PTR_FORMAT, klass_name, field_name, p2i(af));
}
} else {
ShouldNotReachHere();
// The field contains null, we still need to record the entry point,
// so it can be restored at runtime.
subgraph_info->add_subgraph_entry_field(field_offset, NULL);
}
}
#ifndef PRODUCT
class VerifySharedOopClosure: public BasicOopIterateClosure {
private:
bool _is_archived;
public:
VerifySharedOopClosure(bool is_archived) : _is_archived(is_archived) {}
void do_oop(narrowOop *p) { VerifySharedOopClosure::do_oop_work(p); }
void do_oop( oop *p) { VerifySharedOopClosure::do_oop_work(p); }
protected:
template <class T> void do_oop_work(T *p) {
oop obj = RawAccess<>::oop_load(p);
if (!CompressedOops::is_null(obj)) {
HeapShared::verify_reachable_objects_from(obj, _is_archived);
}
}
};
void HeapShared::verify_subgraph_from_static_field(InstanceKlass* k, int field_offset) {
assert(DumpSharedSpaces, "dump time only");
assert(k->is_shared_boot_class(), "must be boot class");
oop m = k->java_mirror();
oop archived_m = MetaspaceShared::find_archived_heap_object(m);
if (CompressedOops::is_null(archived_m)) {
return;
}
oop f = m->obj_field(field_offset);
if (!CompressedOops::is_null(f)) {
verify_subgraph_from(f);
}
}
void HeapShared::verify_subgraph_from(oop orig_obj) {
oop archived_obj = MetaspaceShared::find_archived_heap_object(orig_obj);
if (archived_obj == NULL) {
// It's OK for the root of a subgraph to be not archived. See comments in
// archive_reachable_objects_from().
return;
}
// Verify that all objects reachable from orig_obj are archived.
init_seen_objects_table();
verify_reachable_objects_from(orig_obj, false);
delete_seen_objects_table();
// Note: we could also verify that all objects reachable from the archived
// copy of orig_obj can only point to archived objects, with:
// init_seen_objects_table();
// verify_reachable_objects_from(archived_obj, true);
// init_seen_objects_table();
// but that's already done in G1HeapVerifier::verify_archive_regions so we
// won't do it here.
}
void HeapShared::verify_reachable_objects_from(oop obj, bool is_archived) {
_num_total_verifications ++;
if (!has_been_seen_during_subgraph_recording(obj)) {
set_has_been_seen_during_subgraph_recording(obj);
if (is_archived) {
assert(MetaspaceShared::is_archive_object(obj), "must be");
assert(MetaspaceShared::find_archived_heap_object(obj) == NULL, "must be");
} else {
assert(!MetaspaceShared::is_archive_object(obj), "must be");
assert(MetaspaceShared::find_archived_heap_object(obj) != NULL, "must be");
}
VerifySharedOopClosure walker(is_archived);
obj->oop_iterate(&walker);
}
}
#endif
HeapShared::SeenObjectsTable* HeapShared::_seen_objects_table = NULL;
int HeapShared::_num_new_walked_objs;
int HeapShared::_num_new_archived_objs;
int HeapShared::_num_old_recorded_klasses;
int HeapShared::_num_total_subgraph_recordings = 0;
int HeapShared::_num_total_walked_objs = 0;
int HeapShared::_num_total_archived_objs = 0;
int HeapShared::_num_total_recorded_klasses = 0;
int HeapShared::_num_total_verifications = 0;
bool HeapShared::has_been_seen_during_subgraph_recording(oop obj) {
return _seen_objects_table->get(obj) != NULL;
}
void HeapShared::set_has_been_seen_during_subgraph_recording(oop obj) {
assert(!has_been_seen_during_subgraph_recording(obj), "sanity");
_seen_objects_table->put(obj, true);
++ _num_new_walked_objs;
}
void HeapShared::start_recording_subgraph(InstanceKlass *k, const char* class_name) {
log_info(cds, heap)("Start recording subgraph(s) for archived fields in %s", class_name);
init_seen_objects_table();
_num_new_walked_objs = 0;
_num_new_archived_objs = 0;
_num_old_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses();
}
void HeapShared::done_recording_subgraph(InstanceKlass *k, const char* class_name) {
int num_new_recorded_klasses = get_subgraph_info(k)->num_subgraph_object_klasses() -
_num_old_recorded_klasses;
log_info(cds, heap)("Done recording subgraph(s) for archived fields in %s: "
"walked %d objs, archived %d new objs, recorded %d classes",
class_name, _num_new_walked_objs, _num_new_archived_objs,
num_new_recorded_klasses);
delete_seen_objects_table();
_num_total_subgraph_recordings ++;
_num_total_walked_objs += _num_new_walked_objs;
_num_total_archived_objs += _num_new_archived_objs;
_num_total_recorded_klasses += num_new_recorded_klasses;
}
struct ArchivableStaticFieldInfo {
const char* class_name;
const char* klass_name;
const char* field_name;
InstanceKlass* klass;
int offset;
@ -553,39 +677,37 @@ static ArchivableStaticFieldInfo archivable_static_fields[] = {
{"java/lang/module/Configuration", "EMPTY_CONFIGURATION"},
};
const static int num_archivable_static_fields = sizeof(archivable_static_fields) / sizeof(ArchivableStaticFieldInfo);
const static int num_archivable_static_fields =
sizeof(archivable_static_fields) / sizeof(ArchivableStaticFieldInfo);
class ArchivableStaticFieldFinder: public FieldClosure {
InstanceKlass* _ik;
Symbol* _field_name;
bool _found;
int _offset;
BasicType _type;
public:
ArchivableStaticFieldFinder(InstanceKlass* ik, Symbol* field_name) :
_ik(ik), _field_name(field_name), _found(false), _offset(-1), _type(T_ILLEGAL) {}
_ik(ik), _field_name(field_name), _found(false), _offset(-1) {}
virtual void do_field(fieldDescriptor* fd) {
if (fd->name() == _field_name) {
assert(!_found, "fields cannot be overloaded");
assert(fd->field_type() == T_OBJECT || fd->field_type() == T_ARRAY, "can archive only obj or array fields");
_found = true;
_offset = fd->offset();
_type = fd->field_type();
assert(_type == T_OBJECT || _type == T_ARRAY, "can archive only obj or array fields");
}
}
bool found() { return _found; }
int offset() { return _offset; }
BasicType type() { return _type; }
};
void HeapShared::init_archivable_static_fields(Thread* THREAD) {
for (int i = 0; i < num_archivable_static_fields; i++) {
ArchivableStaticFieldInfo* info = &archivable_static_fields[i];
TempNewSymbol class_name = SymbolTable::new_symbol(info->class_name, THREAD);
TempNewSymbol klass_name = SymbolTable::new_symbol(info->klass_name, THREAD);
TempNewSymbol field_name = SymbolTable::new_symbol(info->field_name, THREAD);
Klass* k = SystemDictionary::resolve_or_null(class_name, THREAD);
Klass* k = SystemDictionary::resolve_or_null(klass_name, THREAD);
assert(k != NULL && !HAS_PENDING_EXCEPTION, "class must exist");
InstanceKlass* ik = InstanceKlass::cast(k);
@ -595,15 +717,50 @@ void HeapShared::init_archivable_static_fields(Thread* THREAD) {
info->klass = ik;
info->offset = finder.offset();
info->type = finder.type();
}
}
void HeapShared::archive_module_graph_objects(Thread* THREAD) {
for (int i = 0; i < num_archivable_static_fields; i++) {
void HeapShared::archive_static_fields(Thread* THREAD) {
// For each class X that has one or more archived fields:
// [1] Dump the subgraph of each archived field
// [2] Create a list of all the class of the objects that can be reached
// by any of these static fields.
// At runtime, these classes are initialized before X's archived fields
// are restored by HeapShared::initialize_from_archived_subgraph().
int i;
for (i = 0; i < num_archivable_static_fields; ) {
ArchivableStaticFieldInfo* info = &archivable_static_fields[i];
archive_reachable_objects_from_static_field(info->klass, info->offset, info->type, CHECK);
const char* klass_name = info->klass_name;
start_recording_subgraph(info->klass, klass_name);
// If you have specified consecutive fields of the same klass in
// archivable_static_fields[], these will be archived in the same
// {start_recording_subgraph ... done_recording_subgraph} pass to
// save time.
for (; i < num_archivable_static_fields; i++) {
ArchivableStaticFieldInfo* f = &archivable_static_fields[i];
if (f->klass_name != klass_name) {
break;
}
archive_reachable_objects_from_static_field(f->klass, f->klass_name,
f->offset, f->field_name, CHECK);
}
done_recording_subgraph(info->klass, klass_name);
}
log_info(cds, heap)("Performed subgraph records = %d times", _num_total_subgraph_recordings);
log_info(cds, heap)("Walked %d objects", _num_total_walked_objs);
log_info(cds, heap)("Archived %d objects", _num_total_archived_objs);
log_info(cds, heap)("Recorded %d klasses", _num_total_recorded_klasses);
#ifndef PRODUCT
for (int i = 0; i < num_archivable_static_fields; i++) {
ArchivableStaticFieldInfo* f = &archivable_static_fields[i];
verify_subgraph_from_static_field(f->klass, f->offset);
}
log_info(cds, heap)("Verified %d references", _num_total_verifications);
#endif
}
// At dump-time, find the location of all the non-null oop pointers in an archived heap