Java example source code file (ciInstanceKlass.hpp)

This example Java source code file (ciInstanceKlass.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basictype, ci_package_access, growablearray, instanceklass\*, instanceklass\:\:being_initialized, instanceklass\:\:classstate, instanceklass\:\:fully_initialized, instanceklass\:\:linked, klass::layout_helper_size_in_bytes, logheapwordsize, null, share_vm_ci_ciinstanceklass_hpp

The ciInstanceKlass.hpp Java example source code

/*
 * Copyright (c) 1999, 2013, 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/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;
  bool                   _has_default_methods;

  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* 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;
    }
  }

  bool has_default_methods()  {
    assert(is_loaded(), "must be loaded");
    return _has_default_methods;
  }

  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