< prev index next > src/hotspot/share/memory/heapShared.hpp
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// object sub-graphs can be accessed at runtime.
GrowableArray<Klass*>* _subgraph_object_klasses;
// A list of _k's static fields as the entry points of archived sub-graphs.
// For each entry field, it is a tuple of field_offset, field_value and
// is_closed_archive flag.
! GrowableArray<juint>* _subgraph_entry_fields;
bool _is_full_module_graph;
public:
KlassSubGraphInfo(Klass* k, bool is_full_module_graph) :
_k(k), _subgraph_object_klasses(NULL),
_subgraph_entry_fields(NULL),
! _is_full_module_graph(is_full_module_graph) {}
~KlassSubGraphInfo() {
if (_subgraph_object_klasses != NULL) {
delete _subgraph_object_klasses;
}
if (_subgraph_entry_fields != NULL) {
// object sub-graphs can be accessed at runtime.
GrowableArray<Klass*>* _subgraph_object_klasses;
// A list of _k's static fields as the entry points of archived sub-graphs.
// For each entry field, it is a tuple of field_offset, field_value and
// is_closed_archive flag.
! GrowableArray<int>* _subgraph_entry_fields;
+ // Does this KlassSubGraphInfo belong to the arcived full module graph
bool _is_full_module_graph;
+
+ // Does this KlassSubGraphInfo references any classes that were loaded while
+ // JvmtiExport::is_early_phase()!=true. If so, this KlassSubGraphInfo cannot be
+ // used at runtime if JVMTI ClassFileLoadHook is enabled.
+ bool _has_non_early_klasses;
+ static bool is_non_early_klass(Klass* k);
+
public:
KlassSubGraphInfo(Klass* k, bool is_full_module_graph) :
_k(k), _subgraph_object_klasses(NULL),
_subgraph_entry_fields(NULL),
! _is_full_module_graph(is_full_module_graph),
+ _has_non_early_klasses(false) {}
~KlassSubGraphInfo() {
if (_subgraph_object_klasses != NULL) {
delete _subgraph_object_klasses;
}
if (_subgraph_entry_fields != NULL) {
Klass* klass() { return _k; }
GrowableArray<Klass*>* subgraph_object_klasses() {
return _subgraph_object_klasses;
}
! GrowableArray<juint>* subgraph_entry_fields() {
return _subgraph_entry_fields;
}
void add_subgraph_entry_field(int static_field_offset, oop v,
bool is_closed_archive);
void add_subgraph_object_klass(Klass *orig_k, Klass *relocated_k);
int num_subgraph_object_klasses() {
return _subgraph_object_klasses == NULL ? 0 :
_subgraph_object_klasses->length();
}
bool is_full_module_graph() const { return _is_full_module_graph; }
};
// An archived record of object sub-graphs reachable from static
// fields within _k's mirror. The record is reloaded from the archive
// at runtime.
class ArchivedKlassSubGraphInfoRecord {
private:
Klass* _k;
bool _is_full_module_graph;
// contains pairs of field offset and value for each subgraph entry field
! Array<juint>* _entry_field_records;
// klasses of objects in archived sub-graphs referenced from the entry points
// (static fields) in the containing class
Array<Klass*>* _subgraph_object_klasses;
public:
ArchivedKlassSubGraphInfoRecord() :
_k(NULL), _entry_field_records(NULL), _subgraph_object_klasses(NULL) {}
void init(KlassSubGraphInfo* info);
Klass* klass() const { return _k; }
! Array<juint>* entry_field_records() const { return _entry_field_records; }
Array<Klass*>* subgraph_object_klasses() const { return _subgraph_object_klasses; }
bool is_full_module_graph() const { return _is_full_module_graph; }
};
#endif // INCLUDE_CDS_JAVA_HEAP
class HeapShared: AllStatic {
friend class VerifySharedOopClosure;
Klass* klass() { return _k; }
GrowableArray<Klass*>* subgraph_object_klasses() {
return _subgraph_object_klasses;
}
! GrowableArray<int>* subgraph_entry_fields() {
return _subgraph_entry_fields;
}
void add_subgraph_entry_field(int static_field_offset, oop v,
bool is_closed_archive);
void add_subgraph_object_klass(Klass *orig_k, Klass *relocated_k);
int num_subgraph_object_klasses() {
return _subgraph_object_klasses == NULL ? 0 :
_subgraph_object_klasses->length();
}
bool is_full_module_graph() const { return _is_full_module_graph; }
+ bool has_non_early_klasses() const { return _has_non_early_klasses; }
};
// An archived record of object sub-graphs reachable from static
// fields within _k's mirror. The record is reloaded from the archive
// at runtime.
class ArchivedKlassSubGraphInfoRecord {
private:
Klass* _k;
bool _is_full_module_graph;
+ bool _has_non_early_klasses;
// contains pairs of field offset and value for each subgraph entry field
! Array<int>* _entry_field_records;
// klasses of objects in archived sub-graphs referenced from the entry points
// (static fields) in the containing class
Array<Klass*>* _subgraph_object_klasses;
public:
ArchivedKlassSubGraphInfoRecord() :
_k(NULL), _entry_field_records(NULL), _subgraph_object_klasses(NULL) {}
void init(KlassSubGraphInfo* info);
Klass* klass() const { return _k; }
! Array<int>* entry_field_records() const { return _entry_field_records; }
Array<Klass*>* subgraph_object_klasses() const { return _subgraph_object_klasses; }
bool is_full_module_graph() const { return _is_full_module_graph; }
+ bool has_non_early_klasses() const { return _has_non_early_klasses; }
};
#endif // INCLUDE_CDS_JAVA_HEAP
class HeapShared: AllStatic {
friend class VerifySharedOopClosure;
static bool has_been_seen_during_subgraph_recording(oop obj);
static void set_has_been_seen_during_subgraph_recording(oop obj);
static void check_module_oop(oop orig_module_obj);
!
public:
static void reset_archived_object_states(TRAPS);
static void create_archived_object_cache() {
_archived_object_cache =
new (ResourceObj::C_HEAP, mtClass)ArchivedObjectCache();
static bool has_been_seen_during_subgraph_recording(oop obj);
static void set_has_been_seen_during_subgraph_recording(oop obj);
static void check_module_oop(oop orig_module_obj);
! static void copy_roots();
+
+ static void resolve_classes_for_subgraphs(ArchivableStaticFieldInfo fields[],
+ int num, TRAPS);
+ static void resolve_classes_for_subgraph_of(Klass* k, TRAPS);
+ static void clear_archived_roots_of(Klass* k);
+ static const ArchivedKlassSubGraphInfoRecord*
+ resolve_or_init_classes_for_subgraph_of(Klass* k, bool do_init, TRAPS);
+ static void resolve_or_init(Klass* k, bool do_init, TRAPS);
+ static void init_archived_fields_for(Klass* k, const ArchivedKlassSubGraphInfoRecord* record, TRAPS);
public:
static void reset_archived_object_states(TRAPS);
static void create_archived_object_cache() {
_archived_object_cache =
new (ResourceObj::C_HEAP, mtClass)ArchivedObjectCache();
bool is_closed_archive,
TRAPS);
static ResourceBitMap calculate_oopmap(MemRegion region);
static void add_to_dumped_interned_strings(oop string);
+
+ // We use the HeapShared::roots() array to make sure that objects stored in the
+ // archived heap regions are not prematurely collected. These roots include:
+ //
+ // - mirrors of classes that have not yet been loaded.
+ // - ConstantPool::resolved_references() of classes that have not yet been loaded.
+ // - ArchivedKlassSubGraphInfoRecords that have not been initialized
+ // - java.lang.Module objects that have not yet been added to the module graph
+ //
+ // When a mirror M becomes referenced by a newly loaded class K, M will be removed
+ // from HeapShared::roots() via clear_root(), and K will be responsible for
+ // keeping M alive.
+ //
+ // Other types of roots are also cleared similarly when they become referenced.
+
+ // Dump-time only. Returns the index of the root, which can be used at run time to read
+ // the root using get_root(index, ...).
+ static int append_root(oop obj);
+
+ // Dump-time and runtime
+ static objArrayOop roots();
+ static oop get_root(int index, bool clear=false);
+
+ // Run-time only
+ static void set_roots(narrowOop roots);
+ static void clear_root(int index);
#endif // INCLUDE_CDS_JAVA_HEAP
public:
static void run_full_gc_in_vm_thread() NOT_CDS_JAVA_HEAP_RETURN;
}
static bool open_archive_heap_region_mapped() {
CDS_JAVA_HEAP_ONLY(return _open_archive_heap_region_mapped);
NOT_CDS_JAVA_HEAP_RETURN_(false);
}
+ static bool is_mapped() {
+ return closed_archive_heap_region_mapped() && open_archive_heap_region_mapped();
+ }
static void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
inline static bool is_archived_object(oop p) NOT_CDS_JAVA_HEAP_RETURN_(false);
+ static void resolve_classes(TRAPS) NOT_CDS_JAVA_HEAP_RETURN;
static void initialize_from_archived_subgraph(Klass* k, TRAPS) NOT_CDS_JAVA_HEAP_RETURN;
// NarrowOops stored in the CDS archive may use a different encoding scheme
// than CompressedOops::{base,shift} -- see FileMapInfo::map_heap_regions_impl.
// To decode them, do not use CompressedOops::decode_not_null. Use this
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