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8209645: Split ClassLoaderData and ClassLoaderDataGraph into separate files

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Reviewed-by: iklam, stuefe
This commit is contained in:
Coleen Phillimore 2018-09-28 16:07:39 -04:00
parent 3a0b2d59ad
commit 7ef28cb2bc
51 changed files with 1014 additions and 872 deletions
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160
src/hotspot/share/classfile/classLoaderData.hpp
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@ -53,9 +53,8 @@
// ClassLoaderData are stored in the runtime representation of classes,
// and provides iterators for root tracing and other GC operations.
class ClassLoaderData;
class ClassLoaderDataGraph;
class JNIMethodBlock;
class Metadebug;
class ModuleEntry;
class PackageEntry;
class ModuleEntryTable;
@ -63,136 +62,6 @@ class PackageEntryTable;
class DictionaryEntry;
class Dictionary;
// GC root for walking class loader data created
class ClassLoaderDataGraph : public AllStatic {
friend class ClassLoaderData;
friend class ClassLoaderDataGraphMetaspaceIterator;
friend class ClassLoaderDataGraphKlassIteratorAtomic;
friend class ClassLoaderDataGraphKlassIteratorStatic;
friend class ClassLoaderDataGraphIterator;
friend class VMStructs;
private:
// All CLDs (except the null CLD) can be reached by walking _head->_next->...
static ClassLoaderData* _head;
static ClassLoaderData* _unloading;
// CMS support.
static ClassLoaderData* _saved_head;
static ClassLoaderData* _saved_unloading;
static bool _should_purge;
// Set if there's anything to purge in the deallocate lists or previous versions
// during a safepoint after class unloading in a full GC.
static bool _should_clean_deallocate_lists;
static bool _safepoint_cleanup_needed;
// OOM has been seen in metaspace allocation. Used to prevent some
// allocations until class unloading
static bool _metaspace_oom;
static volatile size_t _num_instance_classes;
static volatile size_t _num_array_classes;
static ClassLoaderData* add_to_graph(Handle class_loader, bool is_unsafe_anonymous);
static ClassLoaderData* add(Handle class_loader, bool is_unsafe_anonymous);
public:
static ClassLoaderData* find_or_create(Handle class_loader);
static void clean_module_and_package_info();
static void purge();
static void clear_claimed_marks();
// Iteration through CLDG inside a safepoint; GC support
static void cld_do(CLDClosure* cl);
static void cld_unloading_do(CLDClosure* cl);
static void roots_cld_do(CLDClosure* strong, CLDClosure* weak);
static void always_strong_cld_do(CLDClosure* cl);
// klass do
// Walking classes through the ClassLoaderDataGraph include array classes. It also includes
// classes that are allocated but not loaded, classes that have errors, and scratch classes
// for redefinition. These classes are removed during the next class unloading.
// Walking the ClassLoaderDataGraph also includes unsafe anonymous classes.
static void classes_do(KlassClosure* klass_closure);
static void classes_do(void f(Klass* const));
static void methods_do(void f(Method*));
static void modules_do(void f(ModuleEntry*));
static void modules_unloading_do(void f(ModuleEntry*));
static void packages_do(void f(PackageEntry*));
static void packages_unloading_do(void f(PackageEntry*));
static void loaded_classes_do(KlassClosure* klass_closure);
static void unlocked_loaded_classes_do(KlassClosure* klass_closure);
static void classes_unloading_do(void f(Klass* const));
static bool do_unloading(bool do_cleaning);
// Expose state to avoid logging overhead in safepoint cleanup tasks.
static inline bool should_clean_metaspaces_and_reset();
static void set_should_clean_deallocate_lists() { _should_clean_deallocate_lists = true; }
static void clean_deallocate_lists(bool purge_previous_versions);
static void walk_metadata_and_clean_metaspaces();
// dictionary do
// Iterate over all klasses in dictionary, but
// just the classes from defining class loaders.
static void dictionary_classes_do(void f(InstanceKlass*));
// Added for initialize_itable_for_klass to handle exceptions.
static void dictionary_classes_do(void f(InstanceKlass*, TRAPS), TRAPS);
// VM_CounterDecay iteration support
static InstanceKlass* try_get_next_class();
static void verify_dictionary();
static void print_dictionary(outputStream* st);
static void print_dictionary_statistics(outputStream* st);
// CMS support.
static void remember_new_clds(bool remember) { _saved_head = (remember ? _head : NULL); }
static GrowableArray<ClassLoaderData*>* new_clds();
static void set_should_purge(bool b) { _should_purge = b; }
static void purge_if_needed() {
// Only purge the CLDG for CMS if concurrent sweep is complete.
if (_should_purge) {
purge();
// reset for next time.
set_should_purge(false);
}
}
static int resize_if_needed();
static bool has_metaspace_oom() { return _metaspace_oom; }
static void set_metaspace_oom(bool value) { _metaspace_oom = value; }
static void print_on(outputStream * const out) PRODUCT_RETURN;
static void print() { print_on(tty); }
static void verify();
// instance and array class counters
static inline size_t num_instance_classes();
static inline size_t num_array_classes();
static inline void inc_instance_classes(size_t count);
static inline void dec_instance_classes(size_t count);
static inline void inc_array_classes(size_t count);
static inline void dec_array_classes(size_t count);
#ifndef PRODUCT
static bool contains_loader_data(ClassLoaderData* loader_data);
#endif
};
class LockedClassesDo : public KlassClosure {
typedef void (*classes_do_func_t)(Klass*);
classes_do_func_t _function;
public:
LockedClassesDo(); // For callers who provide their own do_klass
LockedClassesDo(classes_do_func_t function);
~LockedClassesDo();
void do_klass(Klass* k) {
(*_function)(k);
}
};
// ClassLoaderData class
class ClassLoaderData : public CHeapObj<mtClass> {
@ -448,31 +317,4 @@ class ClassLoaderData : public CHeapObj<mtClass> {
JFR_ONLY(DEFINE_TRACE_ID_METHODS;)
};
// An iterator that distributes Klasses to parallel worker threads.
class ClassLoaderDataGraphKlassIteratorAtomic : public StackObj {
Klass* volatile _next_klass;
public:
ClassLoaderDataGraphKlassIteratorAtomic();
Klass* next_klass();
private:
static Klass* next_klass_in_cldg(Klass* klass);
};
class ClassLoaderDataGraphMetaspaceIterator : public StackObj {
ClassLoaderData* _data;
public:
ClassLoaderDataGraphMetaspaceIterator();
~ClassLoaderDataGraphMetaspaceIterator();
bool repeat() { return _data != NULL; }
ClassLoaderMetaspace* get_next() {
assert(_data != NULL, "Should not be NULL in call to the iterator");
ClassLoaderMetaspace* result = _data->metaspace_or_null();
_data = _data->next();
// This result might be NULL for class loaders without metaspace
// yet. It would be nice to return only non-null results but
// there is no guarantee that there will be a non-null result
// down the list so the caller is going to have to check.
return result;
}
};
#endif // SHARE_VM_CLASSFILE_CLASSLOADERDATA_HPP