| /* |
| * Copyright (c) 1997, 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_OOPS_ARRAYKLASS_HPP |
| #define SHARE_VM_OOPS_ARRAYKLASS_HPP |
| |
| #include "memory/universe.hpp" |
| #include "oops/klass.hpp" |
| |
| class fieldDescriptor; |
| class klassVtable; |
| |
| // ArrayKlass is the abstract baseclass for all array classes |
| |
| class ArrayKlass: public Klass { |
| friend class VMStructs; |
| private: |
| int _dimension; // This is n'th-dimensional array. |
| Klass* volatile _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). |
| Klass* volatile _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). |
| int _vtable_len; // size of vtable for this klass |
| oop _component_mirror; // component type, as a java/lang/Class |
| |
| protected: |
| // Constructors |
| // The constructor with the Symbol argument does the real array |
| // initialization, the other is a dummy |
| ArrayKlass(Symbol* name); |
| ArrayKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for cds"); } |
| |
| public: |
| // Testing operation |
| bool oop_is_array_slow() const { return true; } |
| |
| // Instance variables |
| int dimension() const { return _dimension; } |
| void set_dimension(int dimension) { _dimension = dimension; } |
| |
| Klass* higher_dimension() const { return _higher_dimension; } |
| void set_higher_dimension(Klass* k) { _higher_dimension = k; } |
| Klass** adr_higher_dimension() { return (Klass**)&this->_higher_dimension;} |
| |
| Klass* lower_dimension() const { return _lower_dimension; } |
| void set_lower_dimension(Klass* k) { _lower_dimension = k; } |
| Klass** adr_lower_dimension() { return (Klass**)&this->_lower_dimension;} |
| |
| // offset of first element, including any padding for the sake of alignment |
| int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } |
| int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } |
| // type of elements (T_OBJECT for both oop arrays and array-arrays) |
| BasicType element_type() const { return layout_helper_element_type(layout_helper()); } |
| |
| oop component_mirror() const { return _component_mirror; } |
| void set_component_mirror(oop m) { klass_oop_store(&_component_mirror, m); } |
| oop* adr_component_mirror() { return (oop*)&this->_component_mirror;} |
| |
| // Compiler/Interpreter offset |
| static ByteSize component_mirror_offset() { return in_ByteSize(offset_of(ArrayKlass, _component_mirror)); } |
| |
| virtual Klass* java_super() const;//{ return SystemDictionary::Object_klass(); } |
| |
| // Allocation |
| // Sizes points to the first dimension of the array, subsequent dimensions |
| // are always in higher memory. The callers of these set that up. |
| virtual oop multi_allocate(int rank, jint* sizes, TRAPS); |
| objArrayOop allocate_arrayArray(int n, int length, TRAPS); |
| |
| // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
| Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
| |
| // Lookup operations |
| Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const; |
| |
| // Casting from Klass* |
| static ArrayKlass* cast(Klass* k) { |
| assert(k->oop_is_array(), "cast to ArrayKlass"); |
| return (ArrayKlass*) k; |
| } |
| |
| GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots); |
| bool compute_is_subtype_of(Klass* k); |
| |
| // Sizing |
| static int header_size() { return sizeof(ArrayKlass)/HeapWordSize; } |
| static int static_size(int header_size); |
| |
| #if INCLUDE_SERVICES |
| virtual void collect_statistics(KlassSizeStats *sz) const { |
| Klass::collect_statistics(sz); |
| // Do nothing for now, but remember to modify if you add new |
| // stuff to ArrayKlass. |
| } |
| #endif |
| |
| // Java vtable |
| klassVtable* vtable() const; // return new klassVtable |
| int vtable_length() const { return _vtable_len; } |
| static int base_vtable_length() { return Universe::base_vtable_size(); } |
| void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } |
| protected: |
| inline intptr_t* start_of_vtable() const; |
| |
| public: |
| // Iterators |
| void array_klasses_do(void f(Klass* k)); |
| void array_klasses_do(void f(Klass* k, TRAPS), TRAPS); |
| |
| // GC support |
| virtual void oops_do(OopClosure* cl); |
| |
| // Return a handle. |
| static void complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS); |
| |
| |
| // jvm support |
| jint compute_modifier_flags(TRAPS) const; |
| |
| // JVMTI support |
| jint jvmti_class_status() const; |
| |
| // CDS support - remove and restore oops from metadata. Oops are not shared. |
| virtual void remove_unshareable_info(); |
| virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS); |
| |
| // Printing |
| void print_on(outputStream* st) const; |
| void print_value_on(outputStream* st) const; |
| |
| void oop_print_on(oop obj, outputStream* st); |
| |
| // Verification |
| void verify_on(outputStream* st); |
| |
| void oop_verify_on(oop obj, outputStream* st); |
| }; |
| |
| #endif // SHARE_VM_OOPS_ARRAYKLASS_HPP |