aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #include "precompiled.hpp"
aoqi@0: #include "classfile/javaClasses.hpp"
aoqi@0: #include "classfile/systemDictionary.hpp"
aoqi@0: #include "classfile/vmSymbols.hpp"
aoqi@0: #include "gc_interface/collectedHeap.inline.hpp"
aoqi@0: #include "jvmtifiles/jvmti.h"
aoqi@0: #include "memory/gcLocker.hpp"
aoqi@0: #include "memory/universe.inline.hpp"
aoqi@0: #include "oops/arrayKlass.hpp"
aoqi@0: #include "oops/arrayOop.hpp"
aoqi@0: #include "oops/instanceKlass.hpp"
aoqi@0: #include "oops/objArrayOop.hpp"
aoqi@0: #include "oops/oop.inline.hpp"
aoqi@0: 
aoqi@0: int ArrayKlass::static_size(int header_size) {
aoqi@0:   // size of an array klass object
aoqi@0:   assert(header_size <= InstanceKlass::header_size(), "bad header size");
aoqi@0:   // If this assert fails, see comments in base_create_array_klass.
aoqi@0:   header_size = InstanceKlass::header_size();
aoqi@0:   int vtable_len = Universe::base_vtable_size();
aoqi@0: #ifdef _LP64
aoqi@0:   int size = header_size + align_object_offset(vtable_len);
aoqi@0: #else
aoqi@0:   int size = header_size + vtable_len;
aoqi@0: #endif
aoqi@0:   return align_object_size(size);
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: Klass* ArrayKlass::java_super() const {
aoqi@0:   if (super() == NULL)  return NULL;  // bootstrap case
aoqi@0:   // Array klasses have primary supertypes which are not reported to Java.
aoqi@0:   // Example super chain:  String[][] -> Object[][] -> Object[] -> Object
aoqi@0:   return SystemDictionary::Object_klass();
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: oop ArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
aoqi@0:   ShouldNotReachHere();
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
aoqi@0: Klass* ArrayKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
aoqi@0:   // There are no fields in an array klass but look to the super class (Object)
aoqi@0:   assert(super(), "super klass must be present");
aoqi@0:   return super()->find_field(name, sig, fd);
aoqi@0: }
aoqi@0: 
aoqi@0: Method* ArrayKlass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const {
aoqi@0:   // There are no methods in an array klass but the super class (Object) has some
aoqi@0:   assert(super(), "super klass must be present");
aoqi@0:   return super()->uncached_lookup_method(name, signature, mode);
aoqi@0: }
aoqi@0: 
aoqi@0: ArrayKlass::ArrayKlass(Symbol* name) {
aoqi@0:   set_name(name);
aoqi@0: 
aoqi@0:   set_super(Universe::is_bootstrapping() ? (Klass*)NULL : SystemDictionary::Object_klass());
aoqi@0:   set_layout_helper(Klass::_lh_neutral_value);
aoqi@0:   set_dimension(1);
aoqi@0:   set_higher_dimension(NULL);
aoqi@0:   set_lower_dimension(NULL);
aoqi@0:   set_component_mirror(NULL);
aoqi@0:   // Arrays don't add any new methods, so their vtable is the same size as
aoqi@0:   // the vtable of klass Object.
aoqi@0:   int vtable_size = Universe::base_vtable_size();
aoqi@0:   set_vtable_length(vtable_size);
aoqi@0:   set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // Initialization of vtables and mirror object is done separatly from base_create_array_klass,
aoqi@0: // since a GC can happen. At this point all instance variables of the ArrayKlass must be setup.
aoqi@0: void ArrayKlass::complete_create_array_klass(ArrayKlass* k, KlassHandle super_klass, TRAPS) {
aoqi@0:   ResourceMark rm(THREAD);
aoqi@0:   k->initialize_supers(super_klass(), CHECK);
aoqi@0:   k->vtable()->initialize_vtable(false, CHECK);
aoqi@0:   java_lang_Class::create_mirror(k, Handle(NULL), CHECK);
aoqi@0: }
aoqi@0: 
aoqi@0: GrowableArray<Klass*>* ArrayKlass::compute_secondary_supers(int num_extra_slots) {
aoqi@0:   // interfaces = { cloneable_klass, serializable_klass };
aoqi@0:   assert(num_extra_slots == 0, "sanity of primitive array type");
aoqi@0:   // Must share this for correct bootstrapping!
aoqi@0:   set_secondary_supers(Universe::the_array_interfaces_array());
aoqi@0:   return NULL;
aoqi@0: }
aoqi@0: 
aoqi@0: bool ArrayKlass::compute_is_subtype_of(Klass* k) {
aoqi@0:   // An array is a subtype of Serializable, Clonable, and Object
aoqi@0:   return    k == SystemDictionary::Object_klass()
aoqi@0:          || k == SystemDictionary::Cloneable_klass()
aoqi@0:          || k == SystemDictionary::Serializable_klass();
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: inline intptr_t* ArrayKlass::start_of_vtable() const {
aoqi@0:   // all vtables start at the same place, that's why we use InstanceKlass::header_size here
aoqi@0:   return ((intptr_t*)this) + InstanceKlass::header_size();
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: klassVtable* ArrayKlass::vtable() const {
aoqi@0:   KlassHandle kh(Thread::current(), this);
aoqi@0:   return new klassVtable(kh, start_of_vtable(), vtable_length() / vtableEntry::size());
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: objArrayOop ArrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
aoqi@0:   if (length < 0) {
aoqi@0:     THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
aoqi@0:   }
aoqi@0:   if (length > arrayOopDesc::max_array_length(T_ARRAY)) {
aoqi@0:     report_java_out_of_memory("Requested array size exceeds VM limit");
aoqi@0:     JvmtiExport::post_array_size_exhausted();
aoqi@0:     THROW_OOP_0(Universe::out_of_memory_error_array_size());
aoqi@0:   }
aoqi@0:   int size = objArrayOopDesc::object_size(length);
aoqi@0:   Klass* k = array_klass(n+dimension(), CHECK_0);
aoqi@0:   ArrayKlass* ak = ArrayKlass::cast(k);
aoqi@0:   objArrayOop o =
aoqi@0:     (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0);
aoqi@0:   // initialization to NULL not necessary, area already cleared
aoqi@0:   return o;
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
aoqi@0:   Klass* k = this;
aoqi@0:   // Iterate over this array klass and all higher dimensions
aoqi@0:   while (k != NULL) {
aoqi@0:     f(k, CHECK);
aoqi@0:     k = ArrayKlass::cast(k)->higher_dimension();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::array_klasses_do(void f(Klass* k)) {
aoqi@0:   Klass* k = this;
aoqi@0:   // Iterate over this array klass and all higher dimensions
aoqi@0:   while (k != NULL) {
aoqi@0:     f(k);
aoqi@0:     k = ArrayKlass::cast(k)->higher_dimension();
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: // GC support
aoqi@0: 
aoqi@0: void ArrayKlass::oops_do(OopClosure* cl) {
aoqi@0:   Klass::oops_do(cl);
aoqi@0: 
aoqi@0:   cl->do_oop(adr_component_mirror());
aoqi@0: }
aoqi@0: 
aoqi@0: // JVM support
aoqi@0: 
aoqi@0: jint ArrayKlass::compute_modifier_flags(TRAPS) const {
aoqi@0:   return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
aoqi@0: }
aoqi@0: 
aoqi@0: // JVMTI support
aoqi@0: 
aoqi@0: jint ArrayKlass::jvmti_class_status() const {
aoqi@0:   return JVMTI_CLASS_STATUS_ARRAY;
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::remove_unshareable_info() {
aoqi@0:   Klass::remove_unshareable_info();
aoqi@0:   // Clear the java mirror
aoqi@0:   set_component_mirror(NULL);
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::restore_unshareable_info(TRAPS) {
aoqi@0:   Klass::restore_unshareable_info(CHECK);
aoqi@0:   // Klass recreates the component mirror also
aoqi@0: }
aoqi@0: 
aoqi@0: // Printing
aoqi@0: 
aoqi@0: void ArrayKlass::print_on(outputStream* st) const {
aoqi@0:   assert(is_klass(), "must be klass");
aoqi@0:   Klass::print_on(st);
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::print_value_on(outputStream* st) const {
aoqi@0:   assert(is_klass(), "must be klass");
aoqi@0:   for(int index = 0; index < dimension(); index++) {
aoqi@0:     st->print("[]");
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::oop_print_on(oop obj, outputStream* st) {
aoqi@0:   assert(obj->is_array(), "must be array");
aoqi@0:   Klass::oop_print_on(obj, st);
aoqi@0:   st->print_cr(" - length: %d", arrayOop(obj)->length());
aoqi@0: }
aoqi@0: 
aoqi@0: 
aoqi@0: // Verification
aoqi@0: 
aoqi@0: void ArrayKlass::verify_on(outputStream* st) {
aoqi@0:   Klass::verify_on(st);
aoqi@0: 
aoqi@0:   if (component_mirror() != NULL) {
aoqi@0:     guarantee(component_mirror()->klass() != NULL, "should have a class");
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: void ArrayKlass::oop_verify_on(oop obj, outputStream* st) {
aoqi@0:   guarantee(obj->is_array(), "must be array");
aoqi@0:   arrayOop a = arrayOop(obj);
aoqi@0:   guarantee(a->length() >= 0, "array with negative length?");
aoqi@0: }