duke@435: /*
xdono@631:  * Copyright 1999-2008 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/_ciInstanceKlass.cpp.incl"
duke@435: 
duke@435: // ciInstanceKlass
duke@435: //
duke@435: // This class represents a klassOop in the HotSpot virtual machine
duke@435: // whose Klass part in an instanceKlass.
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::ciInstanceKlass
duke@435: //
duke@435: // Loaded instance klass.
kvn@479: ciInstanceKlass::ciInstanceKlass(KlassHandle h_k) :
kvn@479:   ciKlass(h_k), _non_static_fields(NULL)
kvn@479: {
duke@435:   assert(get_Klass()->oop_is_instance(), "wrong type");
duke@435:   instanceKlass* ik = get_instanceKlass();
duke@435: 
duke@435:   AccessFlags access_flags = ik->access_flags();
duke@435:   _flags = ciFlags(access_flags);
duke@435:   _has_finalizer = access_flags.has_finalizer();
duke@435:   _has_subklass = ik->subklass() != NULL;
duke@435:   _is_initialized = ik->is_initialized();
duke@435:   // Next line must follow and use the result of the previous line:
duke@435:   _is_linked = _is_initialized || ik->is_linked();
duke@435:   _nonstatic_field_size = ik->nonstatic_field_size();
coleenp@548:   _has_nonstatic_fields = ik->has_nonstatic_fields();
duke@435:   _nonstatic_fields = NULL; // initialized lazily by compute_nonstatic_fields:
duke@435: 
duke@435:   _nof_implementors = ik->nof_implementors();
duke@435:   for (int i = 0; i < implementors_limit; i++) {
duke@435:     _implementors[i] = NULL;  // we will fill these lazily
duke@435:   }
duke@435: 
duke@435:   Thread *thread = Thread::current();
duke@435:   if (ciObjectFactory::is_initialized()) {
duke@435:     _loader = JNIHandles::make_local(thread, ik->class_loader());
duke@435:     _protection_domain = JNIHandles::make_local(thread,
duke@435:                                                 ik->protection_domain());
duke@435:     _is_shared = false;
duke@435:   } else {
duke@435:     Handle h_loader(thread, ik->class_loader());
duke@435:     Handle h_protection_domain(thread, ik->protection_domain());
duke@435:     _loader = JNIHandles::make_global(h_loader);
duke@435:     _protection_domain = JNIHandles::make_global(h_protection_domain);
duke@435:     _is_shared = true;
duke@435:   }
duke@435: 
duke@435:   // Lazy fields get filled in only upon request.
duke@435:   _super  = NULL;
duke@435:   _java_mirror = NULL;
duke@435: 
duke@435:   if (is_shared()) {
never@1577:     if (h_k() != SystemDictionary::Object_klass()) {
duke@435:       super();
duke@435:     }
duke@435:     java_mirror();
duke@435:     //compute_nonstatic_fields();  // done outside of constructor
duke@435:   }
duke@435: 
duke@435:   _field_cache = NULL;
duke@435: }
duke@435: 
duke@435: // Version for unloaded classes:
duke@435: ciInstanceKlass::ciInstanceKlass(ciSymbol* name,
duke@435:                                  jobject loader, jobject protection_domain)
duke@435:   : ciKlass(name, ciInstanceKlassKlass::make())
duke@435: {
duke@435:   assert(name->byte_at(0) != '[', "not an instance klass");
duke@435:   _is_initialized = false;
duke@435:   _is_linked = false;
duke@435:   _nonstatic_field_size = -1;
coleenp@548:   _has_nonstatic_fields = false;
duke@435:   _nonstatic_fields = NULL;
duke@435:   _nof_implementors = -1;
duke@435:   _loader = loader;
duke@435:   _protection_domain = protection_domain;
duke@435:   _is_shared = false;
duke@435:   _super = NULL;
duke@435:   _java_mirror = NULL;
duke@435:   _field_cache = NULL;
duke@435: }
duke@435: 
duke@435: 
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::compute_shared_is_initialized
duke@435: bool ciInstanceKlass::compute_shared_is_initialized() {
duke@435:   GUARDED_VM_ENTRY(
duke@435:     instanceKlass* ik = get_instanceKlass();
duke@435:     _is_initialized = ik->is_initialized();
duke@435:     return _is_initialized;
duke@435:   )
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::compute_shared_is_linked
duke@435: bool ciInstanceKlass::compute_shared_is_linked() {
duke@435:   GUARDED_VM_ENTRY(
duke@435:     instanceKlass* ik = get_instanceKlass();
duke@435:     _is_linked = ik->is_linked();
duke@435:     return _is_linked;
duke@435:   )
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::compute_shared_has_subklass
duke@435: bool ciInstanceKlass::compute_shared_has_subklass() {
duke@435:   GUARDED_VM_ENTRY(
duke@435:     instanceKlass* ik = get_instanceKlass();
duke@435:     _has_subklass = ik->subklass() != NULL;
duke@435:     return _has_subklass;
duke@435:   )
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::compute_shared_nof_implementors
duke@435: int ciInstanceKlass::compute_shared_nof_implementors() {
duke@435:   // We requery this property, since it is a very old ciObject.
duke@435:   GUARDED_VM_ENTRY(
duke@435:     instanceKlass* ik = get_instanceKlass();
duke@435:     _nof_implementors = ik->nof_implementors();
duke@435:     return _nof_implementors;
duke@435:   )
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::loader
duke@435: oop ciInstanceKlass::loader() {
duke@435:   ASSERT_IN_VM;
duke@435:   return JNIHandles::resolve(_loader);
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::loader_handle
duke@435: jobject ciInstanceKlass::loader_handle() {
duke@435:   return _loader;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::protection_domain
duke@435: oop ciInstanceKlass::protection_domain() {
duke@435:   ASSERT_IN_VM;
duke@435:   return JNIHandles::resolve(_protection_domain);
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::protection_domain_handle
duke@435: jobject ciInstanceKlass::protection_domain_handle() {
duke@435:   return _protection_domain;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::field_cache
duke@435: //
duke@435: // Get the field cache associated with this klass.
duke@435: ciConstantPoolCache* ciInstanceKlass::field_cache() {
duke@435:   if (is_shared()) {
duke@435:     return NULL;
duke@435:   }
duke@435:   if (_field_cache == NULL) {
duke@435:     assert(!is_java_lang_Object(), "Object has no fields");
duke@435:     Arena* arena = CURRENT_ENV->arena();
duke@435:     _field_cache = new (arena) ciConstantPoolCache(arena, 5);
duke@435:   }
duke@435:   return _field_cache;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::get_canonical_holder
duke@435: //
duke@435: ciInstanceKlass* ciInstanceKlass::get_canonical_holder(int offset) {
duke@435:   #ifdef ASSERT
duke@435:   if (!(offset >= 0 && offset < layout_helper())) {
duke@435:     tty->print("*** get_canonical_holder(%d) on ", offset);
duke@435:     this->print();
duke@435:     tty->print_cr(" ***");
duke@435:   };
duke@435:   assert(offset >= 0 && offset < layout_helper(), "offset must be tame");
duke@435:   #endif
duke@435: 
coleenp@548:   if (offset < instanceOopDesc::base_offset_in_bytes()) {
duke@435:     // All header offsets belong properly to java/lang/Object.
duke@435:     return CURRENT_ENV->Object_klass();
duke@435:   }
duke@435: 
duke@435:   ciInstanceKlass* self = this;
duke@435:   for (;;) {
duke@435:     assert(self->is_loaded(), "must be loaded to have size");
duke@435:     ciInstanceKlass* super = self->super();
coleenp@548:     if (super == NULL || super->nof_nonstatic_fields() == 0 ||
coleenp@548:         !super->contains_field_offset(offset)) {
duke@435:       return self;
duke@435:     } else {
duke@435:       self = super;  // return super->get_canonical_holder(offset)
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::is_java_lang_Object
duke@435: //
duke@435: // Is this klass java.lang.Object?
duke@435: bool ciInstanceKlass::is_java_lang_Object() {
duke@435:   return equals(CURRENT_ENV->Object_klass());
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::uses_default_loader
duke@435: bool ciInstanceKlass::uses_default_loader() {
twisti@1573:   // Note:  We do not need to resolve the handle or enter the VM
twisti@1573:   // in order to test null-ness.
twisti@1573:   return _loader == NULL;
twisti@1573: }
twisti@1573: 
twisti@1573: // ------------------------------------------------------------------
twisti@1573: // ciInstanceKlass::is_in_package
twisti@1573: //
twisti@1573: // Is this klass in the given package?
twisti@1573: bool ciInstanceKlass::is_in_package(const char* packagename, int len) {
twisti@1573:   // To avoid class loader mischief, this test always rejects application classes.
twisti@1573:   if (!uses_default_loader())
twisti@1573:     return false;
twisti@1573:   GUARDED_VM_ENTRY(
twisti@1573:     return is_in_package_impl(packagename, len);
twisti@1573:   )
twisti@1573: }
twisti@1573: 
twisti@1573: bool ciInstanceKlass::is_in_package_impl(const char* packagename, int len) {
twisti@1573:   ASSERT_IN_VM;
twisti@1573: 
twisti@1573:   // If packagename contains trailing '/' exclude it from the
twisti@1573:   // prefix-test since we test for it explicitly.
twisti@1573:   if (packagename[len - 1] == '/')
twisti@1573:     len--;
twisti@1573: 
twisti@1573:   if (!name()->starts_with(packagename, len))
twisti@1573:     return false;
twisti@1573: 
twisti@1573:   // Test if the class name is something like "java/lang".
twisti@1573:   if ((len + 1) > name()->utf8_length())
twisti@1573:     return false;
twisti@1573: 
twisti@1573:   // Test for trailing '/'
twisti@1573:   if ((char) name()->byte_at(len) != '/')
twisti@1573:     return false;
twisti@1573: 
twisti@1573:   // Make sure it's not actually in a subpackage:
twisti@1573:   if (name()->index_of_at(len+1, "/", 1) >= 0)
twisti@1573:     return false;
twisti@1573: 
twisti@1573:   return true;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::print_impl
duke@435: //
duke@435: // Implementation of the print method.
duke@435: void ciInstanceKlass::print_impl(outputStream* st) {
duke@435:   ciKlass::print_impl(st);
duke@435:   GUARDED_VM_ENTRY(st->print(" loader=0x%x", (address)loader());)
duke@435:   if (is_loaded()) {
duke@435:     st->print(" loaded=true initialized=%s finalized=%s subklass=%s size=%d flags=",
duke@435:               bool_to_str(is_initialized()),
duke@435:               bool_to_str(has_finalizer()),
duke@435:               bool_to_str(has_subklass()),
duke@435:               layout_helper());
duke@435: 
duke@435:     _flags.print_klass_flags();
duke@435: 
duke@435:     if (_super) {
duke@435:       st->print(" super=");
duke@435:       _super->print_name();
duke@435:     }
duke@435:     if (_java_mirror) {
duke@435:       st->print(" mirror=PRESENT");
duke@435:     }
duke@435:   } else {
duke@435:     st->print(" loaded=false");
duke@435:   }
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::super
duke@435: //
duke@435: // Get the superklass of this klass.
duke@435: ciInstanceKlass* ciInstanceKlass::super() {
duke@435:   assert(is_loaded(), "must be loaded");
duke@435:   if (_super == NULL && !is_java_lang_Object()) {
duke@435:     GUARDED_VM_ENTRY(
duke@435:       klassOop super_klass = get_instanceKlass()->super();
duke@435:       _super = CURRENT_ENV->get_object(super_klass)->as_instance_klass();
duke@435:     )
duke@435:   }
duke@435:   return _super;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::java_mirror
duke@435: //
duke@435: // Get the instance of java.lang.Class corresponding to this klass.
duke@435: ciInstance* ciInstanceKlass::java_mirror() {
duke@435:   assert(is_loaded(), "must be loaded");
duke@435:   if (_java_mirror == NULL) {
duke@435:     _java_mirror = ciKlass::java_mirror();
duke@435:   }
duke@435:   return _java_mirror;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::unique_concrete_subklass
duke@435: ciInstanceKlass* ciInstanceKlass::unique_concrete_subklass() {
duke@435:   if (!is_loaded())     return NULL; // No change if class is not loaded
duke@435:   if (!is_abstract())   return NULL; // Only applies to abstract classes.
duke@435:   if (!has_subklass())  return NULL; // Must have at least one subklass.
duke@435:   VM_ENTRY_MARK;
duke@435:   instanceKlass* ik = get_instanceKlass();
duke@435:   Klass* up = ik->up_cast_abstract();
duke@435:   assert(up->oop_is_instance(), "must be instanceKlass");
duke@435:   if (ik == up) {
duke@435:     return NULL;
duke@435:   }
duke@435:   return CURRENT_THREAD_ENV->get_object(up->as_klassOop())->as_instance_klass();
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::has_finalizable_subclass
duke@435: bool ciInstanceKlass::has_finalizable_subclass() {
duke@435:   if (!is_loaded())     return true;
duke@435:   VM_ENTRY_MARK;
duke@435:   return Dependencies::find_finalizable_subclass(get_instanceKlass()) != NULL;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::get_field_by_offset
duke@435: ciField* ciInstanceKlass::get_field_by_offset(int field_offset, bool is_static) {
duke@435:   if (!is_static) {
duke@435:     for (int i = 0, len = nof_nonstatic_fields(); i < len; i++) {
duke@435:       ciField* field = _nonstatic_fields->at(i);
duke@435:       int  field_off = field->offset_in_bytes();
duke@435:       if (field_off == field_offset)
duke@435:         return field;
duke@435:       if (field_off > field_offset)
duke@435:         break;
duke@435:       // could do binary search or check bins, but probably not worth it
duke@435:     }
duke@435:     return NULL;
duke@435:   }
duke@435:   VM_ENTRY_MARK;
duke@435:   instanceKlass* k = get_instanceKlass();
duke@435:   fieldDescriptor fd;
duke@435:   if (!k->find_field_from_offset(field_offset, is_static, &fd)) {
duke@435:     return NULL;
duke@435:   }
duke@435:   ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
duke@435:   return field;
duke@435: }
duke@435: 
kvn@479: // ------------------------------------------------------------------
never@1515: // ciInstanceKlass::get_field_by_name
never@1515: ciField* ciInstanceKlass::get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static) {
never@1515:   VM_ENTRY_MARK;
never@1515:   instanceKlass* k = get_instanceKlass();
never@1515:   fieldDescriptor fd;
never@1515:   klassOop def = k->find_field(name->get_symbolOop(), signature->get_symbolOop(), is_static, &fd);
never@1515:   if (def == NULL) {
never@1515:     return NULL;
never@1515:   }
never@1515:   ciField* field = new (CURRENT_THREAD_ENV->arena()) ciField(&fd);
never@1515:   return field;
never@1515: }
never@1515: 
never@1515: // ------------------------------------------------------------------
kvn@479: // ciInstanceKlass::non_static_fields.
kvn@479: 
kvn@479: class NonStaticFieldFiller: public FieldClosure {
kvn@479:   GrowableArray<ciField*>* _arr;
kvn@479:   ciEnv* _curEnv;
kvn@479: public:
kvn@479:   NonStaticFieldFiller(ciEnv* curEnv, GrowableArray<ciField*>* arr) :
kvn@479:     _curEnv(curEnv), _arr(arr)
kvn@479:   {}
kvn@479:   void do_field(fieldDescriptor* fd) {
kvn@479:     ciField* field = new (_curEnv->arena()) ciField(fd);
kvn@479:     _arr->append(field);
kvn@479:   }
kvn@479: };
kvn@479: 
kvn@479: GrowableArray<ciField*>* ciInstanceKlass::non_static_fields() {
kvn@479:   if (_non_static_fields == NULL) {
kvn@479:     VM_ENTRY_MARK;
kvn@479:     ciEnv* curEnv = ciEnv::current();
kvn@479:     instanceKlass* ik = get_instanceKlass();
kvn@479:     int max_n_fields = ik->fields()->length()/instanceKlass::next_offset;
kvn@479: 
kvn@479:     _non_static_fields =
kvn@479:       new (curEnv->arena()) GrowableArray<ciField*>(max_n_fields);
kvn@479:     NonStaticFieldFiller filler(curEnv, _non_static_fields);
kvn@479:     ik->do_nonstatic_fields(&filler);
kvn@479:   }
kvn@479:   return _non_static_fields;
kvn@479: }
kvn@479: 
duke@435: static int sort_field_by_offset(ciField** a, ciField** b) {
duke@435:   return (*a)->offset_in_bytes() - (*b)->offset_in_bytes();
duke@435:   // (no worries about 32-bit overflow...)
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::compute_nonstatic_fields
duke@435: int ciInstanceKlass::compute_nonstatic_fields() {
duke@435:   assert(is_loaded(), "must be loaded");
duke@435: 
duke@435:   if (_nonstatic_fields != NULL)
duke@435:     return _nonstatic_fields->length();
duke@435: 
coleenp@548:   if (!has_nonstatic_fields()) {
duke@435:     Arena* arena = CURRENT_ENV->arena();
duke@435:     _nonstatic_fields = new (arena) GrowableArray<ciField*>(arena, 0, 0, NULL);
duke@435:     return 0;
duke@435:   }
duke@435:   assert(!is_java_lang_Object(), "bootstrap OK");
duke@435: 
coleenp@548:   // Size in bytes of my fields, including inherited fields.
kvn@600:   int fsize = nonstatic_field_size() * heapOopSize;
coleenp@548: 
duke@435:   ciInstanceKlass* super = this->super();
duke@435:   GrowableArray<ciField*>* super_fields = NULL;
coleenp@548:   if (super != NULL && super->has_nonstatic_fields()) {
kvn@600:     int super_fsize  = super->nonstatic_field_size() * heapOopSize;
coleenp@548:     int super_flen   = super->nof_nonstatic_fields();
duke@435:     super_fields = super->_nonstatic_fields;
duke@435:     assert(super_flen == 0 || super_fields != NULL, "first get nof_fields");
coleenp@548:     // See if I am no larger than my super; if so, I can use his fields.
coleenp@548:     if (fsize == super_fsize) {
coleenp@548:       _nonstatic_fields = super_fields;
coleenp@548:       return super_fields->length();
coleenp@548:     }
duke@435:   }
duke@435: 
duke@435:   GrowableArray<ciField*>* fields = NULL;
duke@435:   GUARDED_VM_ENTRY({
duke@435:       fields = compute_nonstatic_fields_impl(super_fields);
duke@435:     });
duke@435: 
duke@435:   if (fields == NULL) {
duke@435:     // This can happen if this class (java.lang.Class) has invisible fields.
duke@435:     _nonstatic_fields = super_fields;
duke@435:     return super_fields->length();
duke@435:   }
duke@435: 
duke@435:   int flen = fields->length();
duke@435: 
duke@435:   // Now sort them by offset, ascending.
duke@435:   // (In principle, they could mix with superclass fields.)
duke@435:   fields->sort(sort_field_by_offset);
duke@435: #ifdef ASSERT
coleenp@548:   int last_offset = instanceOopDesc::base_offset_in_bytes();
duke@435:   for (int i = 0; i < fields->length(); i++) {
duke@435:     ciField* field = fields->at(i);
duke@435:     int offset = field->offset_in_bytes();
coleenp@548:     int size   = (field->_type == NULL) ? heapOopSize : field->size_in_bytes();
duke@435:     assert(last_offset <= offset, "no field overlap");
duke@435:     if (last_offset > (int)sizeof(oopDesc))
duke@435:       assert((offset - last_offset) < BytesPerLong, "no big holes");
duke@435:     // Note:  Two consecutive T_BYTE fields will be separated by wordSize-1
duke@435:     // padding bytes if one of them is declared by a superclass.
duke@435:     // This is a minor inefficiency classFileParser.cpp.
duke@435:     last_offset = offset + size;
duke@435:   }
kvn@600:   assert(last_offset <= (int)instanceOopDesc::base_offset_in_bytes() + fsize, "no overflow");
duke@435: #endif
duke@435: 
duke@435:   _nonstatic_fields = fields;
duke@435:   return flen;
duke@435: }
duke@435: 
duke@435: GrowableArray<ciField*>*
duke@435: ciInstanceKlass::compute_nonstatic_fields_impl(GrowableArray<ciField*>*
duke@435:                                                super_fields) {
duke@435:   ASSERT_IN_VM;
duke@435:   Arena* arena = CURRENT_ENV->arena();
duke@435:   int flen = 0;
duke@435:   GrowableArray<ciField*>* fields = NULL;
duke@435:   instanceKlass* k = get_instanceKlass();
duke@435:   typeArrayOop fields_array = k->fields();
duke@435:   for (int pass = 0; pass <= 1; pass++) {
duke@435:     for (int i = 0, alen = fields_array->length(); i < alen; i += instanceKlass::next_offset) {
duke@435:       fieldDescriptor fd;
duke@435:       fd.initialize(k->as_klassOop(), i);
duke@435:       if (fd.is_static())  continue;
duke@435:       if (pass == 0) {
duke@435:         flen += 1;
duke@435:       } else {
duke@435:         ciField* field = new (arena) ciField(&fd);
duke@435:         fields->append(field);
duke@435:       }
duke@435:     }
duke@435: 
duke@435:     // Between passes, allocate the array:
duke@435:     if (pass == 0) {
duke@435:       if (flen == 0) {
duke@435:         return NULL;  // return nothing if none are locally declared
duke@435:       }
duke@435:       if (super_fields != NULL) {
duke@435:         flen += super_fields->length();
duke@435:       }
duke@435:       fields = new (arena) GrowableArray<ciField*>(arena, flen, 0, NULL);
duke@435:       if (super_fields != NULL) {
duke@435:         fields->appendAll(super_fields);
duke@435:       }
duke@435:     }
duke@435:   }
duke@435:   assert(fields->length() == flen, "sanity");
duke@435:   return fields;
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::find_method
duke@435: //
duke@435: // Find a method in this klass.
duke@435: ciMethod* ciInstanceKlass::find_method(ciSymbol* name, ciSymbol* signature) {
duke@435:   VM_ENTRY_MARK;
duke@435:   instanceKlass* k = get_instanceKlass();
duke@435:   symbolOop name_sym = name->get_symbolOop();
duke@435:   symbolOop sig_sym= signature->get_symbolOop();
duke@435: 
duke@435:   methodOop m = k->find_method(name_sym, sig_sym);
duke@435:   if (m == NULL)  return NULL;
duke@435: 
duke@435:   return CURRENT_THREAD_ENV->get_object(m)->as_method();
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::is_leaf_type
duke@435: bool ciInstanceKlass::is_leaf_type() {
duke@435:   assert(is_loaded(), "must be loaded");
duke@435:   if (is_shared()) {
duke@435:     return is_final();  // approximately correct
duke@435:   } else {
duke@435:     return !_has_subklass && (_nof_implementors == 0);
duke@435:   }
duke@435: }
duke@435: 
duke@435: // ------------------------------------------------------------------
duke@435: // ciInstanceKlass::implementor
duke@435: //
duke@435: // Report an implementor of this interface.
duke@435: // Returns NULL if exact information is not available.
duke@435: // Note that there are various races here, since my copy
duke@435: // of _nof_implementors might be out of date with respect
duke@435: // to results returned by instanceKlass::implementor.
duke@435: // This is OK, since any dependencies we decide to assert
duke@435: // will be checked later under the Compile_lock.
duke@435: ciInstanceKlass* ciInstanceKlass::implementor(int n) {
duke@435:   if (n > implementors_limit) {
duke@435:     return NULL;
duke@435:   }
duke@435:   ciInstanceKlass* impl = _implementors[n];
duke@435:   if (impl == NULL) {
duke@435:     if (_nof_implementors > implementors_limit) {
duke@435:       return NULL;
duke@435:     }
duke@435:     // Go into the VM to fetch the implementor.
duke@435:     {
duke@435:       VM_ENTRY_MARK;
duke@435:       klassOop k = get_instanceKlass()->implementor(n);
duke@435:       if (k != NULL) {
duke@435:         impl = CURRENT_THREAD_ENV->get_object(k)->as_instance_klass();
duke@435:       }
duke@435:     }
duke@435:     // Memoize this result.
duke@435:     if (!is_shared()) {
duke@435:       _implementors[n] = (impl == NULL)? this: impl;
duke@435:     }
duke@435:   } else if (impl == this) {
duke@435:     impl = NULL;  // memoized null result from a VM query
duke@435:   }
duke@435:   return impl;
duke@435: }