duke@435: /*
duke@435:  * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_arrayKlass.cpp.incl"
duke@435: 
duke@435: int arrayKlass::object_size(int header_size) const {
duke@435:   // size of an array klass object
duke@435:   assert(header_size <= instanceKlass::header_size(), "bad header size");
duke@435:   // If this assert fails, see comments in base_create_array_klass.
duke@435:   header_size = instanceKlass::header_size();
duke@435: #ifdef _LP64
duke@435:   int size = header_size + align_object_offset(vtable_length());
duke@435: #else
duke@435:   int size = header_size + vtable_length();
duke@435: #endif
duke@435:   return align_object_size(size);
duke@435: }
duke@435: 
duke@435: 
duke@435: klassOop arrayKlass::java_super() const {
duke@435:   if (super() == NULL)  return NULL;  // bootstrap case
duke@435:   // Array klasses have primary supertypes which are not reported to Java.
duke@435:   // Example super chain:  String[][] -> Object[][] -> Object[] -> Object
duke@435:   return SystemDictionary::object_klass();
duke@435: }
duke@435: 
duke@435: 
duke@435: oop arrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
duke@435:   ShouldNotReachHere();
duke@435:   return NULL;
duke@435: }
duke@435: 
duke@435: methodOop arrayKlass::uncached_lookup_method(symbolOop name, symbolOop signature) const {
duke@435:   // There are no methods in an array klass but the super class (Object) has some
duke@435:   assert(super(), "super klass must be present");
duke@435:   return Klass::cast(super())->uncached_lookup_method(name, signature);
duke@435: }
duke@435: 
duke@435: 
duke@435: arrayKlassHandle arrayKlass::base_create_array_klass(
duke@435: const Klass_vtbl& cplusplus_vtbl, int header_size, KlassHandle klass, TRAPS) {
duke@435:   // Allocation
duke@435:   // Note: because the Java vtable must start at the same offset in all klasses,
duke@435:   // we must insert filler fields into arrayKlass to make it the same size as instanceKlass.
duke@435:   // If this assert fails, add filler to instanceKlass to make it bigger.
duke@435:   assert(header_size <= instanceKlass::header_size(),
duke@435:          "array klasses must be same size as instanceKlass");
duke@435:   header_size = instanceKlass::header_size();
duke@435:   // Arrays don't add any new methods, so their vtable is the same size as
duke@435:   // the vtable of klass Object.
duke@435:   int vtable_size = Universe::base_vtable_size();
duke@435:   arrayKlassHandle k;
duke@435:   KlassHandle base_klass = Klass::base_create_klass(klass,
duke@435:                                                  header_size + vtable_size,
duke@435:                                                  cplusplus_vtbl, CHECK_(k));
duke@435: 
duke@435:   // No safepoint should be possible until the handle's
duke@435:   // target below becomes parsable
duke@435:   No_Safepoint_Verifier no_safepoint;
duke@435:   k = arrayKlassHandle(THREAD, base_klass());
duke@435: 
duke@435:   assert(!k()->is_parsable(), "not expecting parsability yet.");
duke@435:   k->set_super(Universe::is_bootstrapping() ? (klassOop)NULL : SystemDictionary::object_klass());
duke@435:   k->set_layout_helper(Klass::_lh_neutral_value);
duke@435:   k->set_dimension(1);
duke@435:   k->set_higher_dimension(NULL);
duke@435:   k->set_lower_dimension(NULL);
duke@435:   k->set_component_mirror(NULL);
duke@435:   k->set_vtable_length(vtable_size);
duke@435:   k->set_is_cloneable(); // All arrays are considered to be cloneable (See JLS 20.1.5)
duke@435: 
duke@435:   assert(k()->is_parsable(), "should be parsable here.");
duke@435:   // Make sure size calculation is right
duke@435:   assert(k()->size() == align_object_size(header_size + vtable_size), "wrong size for object");
duke@435: 
duke@435:   return k;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Initialization of vtables and mirror object is done separatly from base_create_array_klass,
duke@435: // since a GC can happen. At this point all instance variables of the arrayKlass must be setup.
duke@435: void arrayKlass::complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS) {
duke@435:   ResourceMark rm(THREAD);
duke@435:   k->initialize_supers(super_klass(), CHECK);
duke@435:   k->vtable()->initialize_vtable(false, CHECK);
duke@435:   java_lang_Class::create_mirror(k, CHECK);
duke@435: }
duke@435: 
duke@435: objArrayOop arrayKlass::compute_secondary_supers(int num_extra_slots, TRAPS) {
duke@435:   // interfaces = { cloneable_klass, serializable_klass };
duke@435:   assert(num_extra_slots == 0, "sanity of primitive array type");
duke@435:   // Must share this for correct bootstrapping!
duke@435:   return Universe::the_array_interfaces_array();
duke@435: }
duke@435: 
duke@435: bool arrayKlass::compute_is_subtype_of(klassOop k) {
duke@435:   // An array is a subtype of Serializable, Clonable, and Object
duke@435:   return    k == SystemDictionary::object_klass()
duke@435:          || k == SystemDictionary::cloneable_klass()
duke@435:          || k == SystemDictionary::serializable_klass();
duke@435: }
duke@435: 
duke@435: 
duke@435: inline intptr_t* arrayKlass::start_of_vtable() const {
duke@435:   // all vtables start at the same place, that's why we use instanceKlass::header_size here
duke@435:   return ((intptr_t*)as_klassOop()) + instanceKlass::header_size();
duke@435: }
duke@435: 
duke@435: 
duke@435: klassVtable* arrayKlass::vtable() const {
duke@435:   KlassHandle kh(Thread::current(), as_klassOop());
duke@435:   return new klassVtable(kh, start_of_vtable(), vtable_length() / vtableEntry::size());
duke@435: }
duke@435: 
duke@435: 
duke@435: objArrayOop arrayKlass::allocate_arrayArray(int n, int length, TRAPS) {
duke@435:   if (length < 0) {
duke@435:     THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
duke@435:   }
duke@435:   if (length > arrayOopDesc::max_array_length(T_ARRAY)) {
duke@435:     THROW_OOP_0(Universe::out_of_memory_error_array_size());
duke@435:   }
duke@435:   int size = objArrayOopDesc::object_size(length);
duke@435:   klassOop k = array_klass(n+dimension(), CHECK_0);
duke@435:   arrayKlassHandle ak (THREAD, k);
duke@435:   objArrayOop o =
duke@435:     (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_0);
duke@435:   // initialization to NULL not necessary, area already cleared
duke@435:   return o;
duke@435: }
duke@435: 
duke@435: 
duke@435: void arrayKlass::array_klasses_do(void f(klassOop k)) {
duke@435:   klassOop k = as_klassOop();
duke@435:   // Iterate over this array klass and all higher dimensions
duke@435:   while (k != NULL) {
duke@435:     f(k);
duke@435:     k = arrayKlass::cast(k)->higher_dimension();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: void arrayKlass::with_array_klasses_do(void f(klassOop k)) {
duke@435:   array_klasses_do(f);
duke@435: }
duke@435: 
duke@435: // JVM support
duke@435: 
duke@435: jint arrayKlass::compute_modifier_flags(TRAPS) const {
duke@435:   return JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC;
duke@435: }
duke@435: 
duke@435: // JVMTI support
duke@435: 
duke@435: jint arrayKlass::jvmti_class_status() const {
duke@435:   return JVMTI_CLASS_STATUS_ARRAY;
duke@435: }
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: 
duke@435: // Printing
duke@435: 
duke@435: void arrayKlass::oop_print_on(oop obj, outputStream* st) {
duke@435:   assert(obj->is_array(), "must be array");
duke@435:   Klass::oop_print_on(obj, st);
duke@435:   st->print_cr(" - length: %d", arrayOop(obj)->length());
duke@435: }
duke@435: 
duke@435: #endif
duke@435: 
duke@435: // Verification
duke@435: 
duke@435: void arrayKlass::oop_verify_on(oop obj, outputStream* st) {
duke@435:   guarantee(obj->is_array(), "must be array");
duke@435:   arrayOop a = arrayOop(obj);
duke@435:   guarantee(a->length() >= 0, "array with negative length?");
duke@435: }