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 /*

  * Copyright (c) 1999, 2012, 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

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  */

 #ifndef SHARE_VM_CI_CIINSTANCEKLASS_HPP

 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP

 #include "ci/ciConstantPoolCache.hpp"

 #include "ci/ciFlags.hpp"

 #include "ci/ciKlass.hpp"

 #include "ci/ciSymbol.hpp"

 // ciInstanceKlass

 //

 // This class represents a Klass* in the HotSpot virtual machine

 // whose Klass part is an InstanceKlass.  It may or may not

 // be loaded.

 class ciInstanceKlass : public ciKlass {

   CI_PACKAGE_ACCESS

   friend class ciBytecodeStream;

   friend class ciEnv;

   friend class ciExceptionHandler;

   friend class ciMethod;

   friend class ciField;

 private:

   jobject                _loader;

   jobject                _protection_domain;

   InstanceKlass::ClassState _init_state;           // state of class

   bool                   _is_shared;

   bool                   _has_finalizer;

   bool                   _has_subklass;

   bool                   _has_nonstatic_fields;

   ciFlags                _flags;

   jint                   _nonstatic_field_size;

   jint                   _nonstatic_oop_map_size;

   // Lazy fields get filled in only upon request.

   ciInstanceKlass*       _super;

   ciInstance*            _java_mirror;

   ciConstantPoolCache*   _field_cache;  // cached map index->field

   GrowableArray<ciField*>* _nonstatic_fields;

   // The possible values of the _implementor fall into following three cases:

   //   NULL: no implementor.

   //   A ciInstanceKlass that's not itself: one implementor.

   //   Itsef: more than one implementors.

   ciInstanceKlass*       _implementor;

   GrowableArray<ciField*>* _non_static_fields;

 protected:

   ciInstanceKlass(KlassHandle h_k);

   ciInstanceKlass(ciSymbol* name, jobject loader, jobject protection_domain);

   InstanceKlass* get_instanceKlass() const {

     return (InstanceKlass*)get_Klass();

   }

   oop loader();

   jobject loader_handle();

   oop protection_domain();

   jobject protection_domain_handle();

   const char* type_string() { return "ciInstanceKlass"; }

   bool is_in_package_impl(const char* packagename, int len);

   void print_impl(outputStream* st);

   ciConstantPoolCache* field_cache();

   bool is_shared() { return _is_shared; }

   void compute_shared_init_state();

   bool compute_shared_has_subklass();

   int  compute_nonstatic_fields();

   GrowableArray<ciField*>* compute_nonstatic_fields_impl(GrowableArray<ciField*>* super_fields);

   // Update the init_state for shared klasses

   void update_if_shared(InstanceKlass::ClassState expected) {

     if (_is_shared && _init_state != expected) {

       if (is_loaded()) compute_shared_init_state();

     }

   }

 public:

   // Has this klass been initialized?

   bool                   is_initialized() {

     update_if_shared(InstanceKlass::fully_initialized);

     return _init_state == InstanceKlass::fully_initialized;

   }

   // Is this klass being initialized?

   bool                   is_being_initialized() {

     update_if_shared(InstanceKlass::being_initialized);

     return _init_state == InstanceKlass::being_initialized;

   }

   // Has this klass been linked?

   bool                   is_linked() {

     update_if_shared(InstanceKlass::linked);

     return _init_state >= InstanceKlass::linked;

   }

   // General klass information.

   ciFlags                flags()          {

     assert(is_loaded(), "must be loaded");

     return _flags;

   }

   bool                   has_finalizer()  {

     assert(is_loaded(), "must be loaded");

     return _has_finalizer; }

   bool                   has_subklass()   {

     assert(is_loaded(), "must be loaded");

     if (_is_shared && !_has_subklass) {

       if (flags().is_final()) {

         return false;

       } else {

         return compute_shared_has_subklass();

       }

     }

     return _has_subklass;

   }

   jint                   size_helper()  {

     return (Klass::layout_helper_size_in_bytes(layout_helper())

             >> LogHeapWordSize);

   }

   jint                   nonstatic_field_size()  {

     assert(is_loaded(), "must be loaded");

     return _nonstatic_field_size; }

   jint                   has_nonstatic_fields()  {

     assert(is_loaded(), "must be loaded");

     return _has_nonstatic_fields; }

   jint                   nonstatic_oop_map_size()  {

     assert(is_loaded(), "must be loaded");

     return _nonstatic_oop_map_size; }

   ciInstanceKlass*       super();

   jint                   nof_implementors() {

     ciInstanceKlass* impl;

     assert(is_loaded(), "must be loaded");

     impl = implementor();

     if (impl == NULL) {

       return 0;

     } else if (impl != this) {

       return 1;

     } else {

       return 2;

     }

   }

   ciInstanceKlass* get_canonical_holder(int offset);

   ciField* get_field_by_offset(int field_offset, bool is_static);

   ciField* get_field_by_name(ciSymbol* name, ciSymbol* signature, bool is_static);

   GrowableArray<ciField*>* non_static_fields();

   // total number of nonstatic fields (including inherited):

   int nof_nonstatic_fields() {

     if (_nonstatic_fields == NULL)

       return compute_nonstatic_fields();

     else

       return _nonstatic_fields->length();

   }

   // nth nonstatic field (presented by ascending address)

   ciField* nonstatic_field_at(int i) {

     assert(_nonstatic_fields != NULL, "");

     return _nonstatic_fields->at(i);

   }

   ciInstanceKlass* unique_concrete_subklass();

   bool has_finalizable_subclass();

   bool contains_field_offset(int offset) {

     return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());

   }

   // Get the instance of java.lang.Class corresponding to

   // this klass.  This instance is used for locking of

   // synchronized static methods of this klass.

   ciInstance*            java_mirror();

   // Java access flags

   bool is_public      () { return flags().is_public(); }

   bool is_final       () { return flags().is_final(); }

   bool is_super       () { return flags().is_super(); }

   bool is_interface   () { return flags().is_interface(); }

   bool is_abstract    () { return flags().is_abstract(); }

   ciMethod* find_method(ciSymbol* name, ciSymbol* signature);

   // Note:  To find a method from name and type strings, use ciSymbol::make,

   // but consider adding to vmSymbols.hpp instead.

   bool is_leaf_type();

   ciInstanceKlass* implementor();

   // Is the defining class loader of this class the default loader?

   bool uses_default_loader() const;

   bool is_java_lang_Object() const;

   BasicType box_klass_type() const;

   bool is_box_klass() const;

   bool is_boxed_value_offset(int offset) const;

   // Is this klass in the given package?

   bool is_in_package(const char* packagename) {

     return is_in_package(packagename, (int) strlen(packagename));

   }

   bool is_in_package(const char* packagename, int len);

   // What kind of ciObject is this?

   bool is_instance_klass() const { return true; }

   bool is_java_klass() const     { return true; }

   virtual ciKlass* exact_klass() {

     if (is_loaded() && is_final() && !is_interface()) {

       return this;

     }

     return NULL;

   }

   // Dump the current state of this klass for compilation replay.

   virtual void dump_replay_data(outputStream* out);

 };

 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP