jdk8-mips64-public/hotspot: src/share/vm/ci/ciInstanceKlass.hpp@49036505ab5f (annotated)

src/share/vm/ci/ciInstanceKlass.hpp@49036505ab5f (annotated)

src/share/vm/ci/ciInstanceKlass.hpp

Thu, 29 Mar 2012 22:18:56 -0400

author: jiangli
date: Thu, 29 Mar 2012 22:18:56 -0400
changeset 3701: 49036505ab5f
parent 2314: f95d63e2154a
child 4037: da91efe96a93
permissions: -rw-r--r--

7154670: The instanceKlass _implementors[] and _nof_implementors are not needed for non-interface klass.
Summary: Change implementor to embedded instanceKlass field.
Reviewed-by: sspitsyn, minqi, coleenp

 /*
  * 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
  * questions.
  *
  */
 #ifndef SHARE_VM_CI_CIINSTANCEKLASS_HPP
 #define SHARE_VM_CI_CIINSTANCEKLASS_HPP
 #include "ci/ciConstantPoolCache.hpp"
 #include "ci/ciFlags.hpp"
 #include "ci/ciInstanceKlassKlass.hpp"
 #include "ci/ciKlass.hpp"
 #include "ci/ciSymbol.hpp"
 // ciInstanceKlass
 //
 // This class represents a klassOop 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();
   bool is_java_lang_Object();
   // 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() { return true; }
   bool is_java_klass()     { return true; }
 };
 #endif // SHARE_VM_CI_CIINSTANCEKLASS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/ci/ciInstanceKlass.hpp@49036505ab5f (annotated)

src/share/vm/ci/ciInstanceKlass.hpp