src/hotspot/share/runtime/fieldDescriptor.hpp
author erikj
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/*
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 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
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#define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
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#include "oops/constantPool.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/fieldType.hpp"
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#include "utilities/accessFlags.hpp"
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#include "utilities/constantTag.hpp"
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// A fieldDescriptor describes the attributes of a single field (instance or class variable).
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// It needs the class constant pool to work (because it only holds indices into the pool
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// rather than the actual info).
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class fieldDescriptor VALUE_OBJ_CLASS_SPEC {
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  AccessFlags         _access_flags;
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  int                 _index; // the field index
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  constantPoolHandle  _cp;
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  // update the access_flags for the field in the klass
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  void update_klass_field_access_flag() {
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    InstanceKlass* ik = field_holder();
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    ik->field(index())->set_access_flags(_access_flags.as_short());
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  }
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  FieldInfo* field() const {
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    InstanceKlass* ik = field_holder();
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    return ik->field(_index);
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  }
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 public:
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  fieldDescriptor() {
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    DEBUG_ONLY(_index = badInt);
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  }
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  fieldDescriptor(InstanceKlass* ik, int index) {
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    DEBUG_ONLY(_index = badInt);
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    reinitialize(ik, index);
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  }
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  Symbol* name() const {
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    return field()->name(_cp());
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  }
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  Symbol* signature() const {
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    return field()->signature(_cp());
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  }
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  InstanceKlass* field_holder()   const    { return _cp->pool_holder(); }
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  ConstantPool* constants()       const    { return _cp(); }
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  AccessFlags access_flags()      const    { return _access_flags; }
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  oop loader()                    const;
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  // Offset (in words) of field from start of instanceOop / Klass*
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  int offset()                    const    { return field()->offset(); }
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  Symbol* generic_signature()     const;
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  int index()                     const    { return _index; }
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  AnnotationArray* annotations()  const;
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  AnnotationArray* type_annotations()  const;
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  // Initial field value
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  bool has_initial_value()        const    { return field()->initval_index() != 0; }
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  int initial_value_index()       const    { return field()->initval_index(); }
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  constantTag initial_value_tag() const;  // The tag will return true on one of is_int(), is_long(), is_single(), is_double()
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  jint int_initial_value()        const;
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  jlong long_initial_value()      const;
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  jfloat float_initial_value()    const;
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  jdouble double_initial_value()  const;
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  oop string_initial_value(TRAPS) const;
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  // Field signature type
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  BasicType field_type()          const    { return FieldType::basic_type(signature()); }
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  // Access flags
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  bool is_public()                const    { return access_flags().is_public(); }
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  bool is_private()               const    { return access_flags().is_private(); }
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  bool is_protected()             const    { return access_flags().is_protected(); }
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  bool is_package_private()       const    { return !is_public() && !is_private() && !is_protected(); }
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  bool is_static()                const    { return access_flags().is_static(); }
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  bool is_final()                 const    { return access_flags().is_final(); }
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  bool is_volatile()              const    { return access_flags().is_volatile(); }
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  bool is_transient()             const    { return access_flags().is_transient(); }
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  bool is_synthetic()             const    { return access_flags().is_synthetic(); }
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  bool is_field_access_watched()  const    { return access_flags().is_field_access_watched(); }
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  bool is_field_modification_watched() const
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                                           { return access_flags().is_field_modification_watched(); }
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  bool has_initialized_final_update() const { return access_flags().has_field_initialized_final_update(); }
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  bool has_generic_signature()    const    { return access_flags().field_has_generic_signature(); }
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  void set_is_field_access_watched(const bool value) {
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    _access_flags.set_is_field_access_watched(value);
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    update_klass_field_access_flag();
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  }
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  void set_is_field_modification_watched(const bool value) {
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    _access_flags.set_is_field_modification_watched(value);
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    update_klass_field_access_flag();
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  }
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  void set_has_initialized_final_update(const bool value) {
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    _access_flags.set_has_field_initialized_final_update(value);
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    update_klass_field_access_flag();
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  }
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  // Initialization
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  void reinitialize(InstanceKlass* ik, int index);
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  // Print
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  void print() { print_on(tty); }
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  void print_on(outputStream* st) const         PRODUCT_RETURN;
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  void print_on_for(outputStream* st, oop obj)  PRODUCT_RETURN;
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  void verify() const                           PRODUCT_RETURN;
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};
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#endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP