src/hotspot/share/oops/fieldInfo.hpp
author coleenp
Thu, 10 Jan 2019 15:13:51 -0500
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child 59056 15936b142f86
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8216167: Update include guards to reflect correct directories Summary: Use script and some manual fixup to fix directores names in include guards. Reviewed-by: lfoltan, eosterlund, kbarrett
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/*
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 * Copyright (c) 2011, 2019, 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_OOPS_FIELDINFO_HPP
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#define SHARE_OOPS_FIELDINFO_HPP
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#include "oops/constantPool.hpp"
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#include "oops/typeArrayOop.hpp"
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#include "classfile/vmSymbols.hpp"
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// This class represents the field information contained in the fields
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// array of an InstanceKlass.  Currently it's laid on top an array of
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// Java shorts but in the future it could simply be used as a real
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// array type.  FieldInfo generally shouldn't be used directly.
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// Fields should be queried either through InstanceKlass or through
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// the various FieldStreams.
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class FieldInfo {
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  friend class fieldDescriptor;
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  friend class JavaFieldStream;
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  friend class ClassFileParser;
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  // fields
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  // Field info extracted from the class file and stored
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  // as an array of 6 shorts.
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#define FIELDINFO_TAG_SIZE             2
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#define FIELDINFO_TAG_BLANK            0
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#define FIELDINFO_TAG_OFFSET           1
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#define FIELDINFO_TAG_TYPE_PLAIN       2
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#define FIELDINFO_TAG_TYPE_CONTENDED   3
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#define FIELDINFO_TAG_MASK             3
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  // Packed field has the tag, and can be either of:
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  //    hi bits <--------------------------- lo bits
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  //   |---------high---------|---------low---------|
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  //    ..........................................00  - blank
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  //    [------------------offset----------------]01  - real field offset
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  //    ......................[-------type-------]10  - plain field with type
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  //    [--contention_group--][-------type-------]11  - contended field with type and contention group
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  enum FieldOffset {
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    access_flags_offset      = 0,
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    name_index_offset        = 1,
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    signature_index_offset   = 2,
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    initval_index_offset     = 3,
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    low_packed_offset        = 4,
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    high_packed_offset       = 5,
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    field_slots              = 6
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  };
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 private:
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  u2 _shorts[field_slots];
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  void set_name_index(u2 val)                    { _shorts[name_index_offset] = val;         }
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  void set_signature_index(u2 val)               { _shorts[signature_index_offset] = val;    }
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  void set_initval_index(u2 val)                 { _shorts[initval_index_offset] = val;      }
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  u2 name_index() const                          { return _shorts[name_index_offset];        }
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  u2 signature_index() const                     { return _shorts[signature_index_offset];   }
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  u2 initval_index() const                       { return _shorts[initval_index_offset];     }
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  static FieldInfo* from_field_array(Array<u2>* fields, int index) {
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    return ((FieldInfo*)fields->adr_at(index * field_slots));
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  }
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  static FieldInfo* from_field_array(u2* fields, int index) {
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    return ((FieldInfo*)(fields + index * field_slots));
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  }
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  void initialize(u2 access_flags,
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                  u2 name_index,
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                  u2 signature_index,
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                  u2 initval_index) {
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    _shorts[access_flags_offset] = access_flags;
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    _shorts[name_index_offset] = name_index;
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    _shorts[signature_index_offset] = signature_index;
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    _shorts[initval_index_offset] = initval_index;
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    _shorts[low_packed_offset] = 0;
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    _shorts[high_packed_offset] = 0;
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  }
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  u2 access_flags() const                        { return _shorts[access_flags_offset];            }
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  u4 offset() const {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_OFFSET:
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        return build_int_from_shorts(_shorts[low_packed_offset], _shorts[high_packed_offset]) >> FIELDINFO_TAG_SIZE;
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#ifndef PRODUCT
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      case FIELDINFO_TAG_TYPE_PLAIN:
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        fatal("Asking offset for the plain type field");
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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        fatal("Asking offset for the contended type field");
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      case FIELDINFO_TAG_BLANK:
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        fatal("Asking offset for the blank field");
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#endif
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    }
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    ShouldNotReachHere();
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    return 0;
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  }
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  bool is_contended() const {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_TYPE_PLAIN:
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        return false;
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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        return true;
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#ifndef PRODUCT
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      case FIELDINFO_TAG_OFFSET:
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        fatal("Asking contended flag for the field with offset");
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      case FIELDINFO_TAG_BLANK:
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        fatal("Asking contended flag for the blank field");
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#endif
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    }
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    ShouldNotReachHere();
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    return false;
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  }
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  u2 contended_group() const {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_TYPE_PLAIN:
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        return 0;
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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        return _shorts[high_packed_offset];
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#ifndef PRODUCT
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      case FIELDINFO_TAG_OFFSET:
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        fatal("Asking the contended group for the field with offset");
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      case FIELDINFO_TAG_BLANK:
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        fatal("Asking the contended group for the blank field");
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#endif
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    }
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    ShouldNotReachHere();
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    return 0;
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 }
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  u2 allocation_type() const {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_TYPE_PLAIN:
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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        return (lo >> FIELDINFO_TAG_SIZE);
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#ifndef PRODUCT
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      case FIELDINFO_TAG_OFFSET:
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        fatal("Asking the field type for field with offset");
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      case FIELDINFO_TAG_BLANK:
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        fatal("Asking the field type for the blank field");
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#endif
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    }
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    ShouldNotReachHere();
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    return 0;
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  }
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  bool is_offset_set() const {
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    return (_shorts[low_packed_offset] & FIELDINFO_TAG_MASK) == FIELDINFO_TAG_OFFSET;
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  }
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  Symbol* name(const constantPoolHandle& cp) const {
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    int index = name_index();
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    if (is_internal()) {
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      return lookup_symbol(index);
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    }
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    return cp->symbol_at(index);
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  }
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  Symbol* signature(const constantPoolHandle& cp) const {
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    int index = signature_index();
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    if (is_internal()) {
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      return lookup_symbol(index);
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    }
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    return cp->symbol_at(index);
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  }
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  void set_access_flags(u2 val)                  { _shorts[access_flags_offset] = val;             }
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  void set_offset(u4 val)                        {
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    val = val << FIELDINFO_TAG_SIZE; // make room for tag
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    _shorts[low_packed_offset] = extract_low_short_from_int(val) | FIELDINFO_TAG_OFFSET;
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    _shorts[high_packed_offset] = extract_high_short_from_int(val);
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  }
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  void set_allocation_type(int type) {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_BLANK:
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        _shorts[low_packed_offset] = ((type << FIELDINFO_TAG_SIZE)) & 0xFFFF;
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        _shorts[low_packed_offset] &= ~FIELDINFO_TAG_MASK;
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        _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_PLAIN;
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        return;
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#ifndef PRODUCT
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      case FIELDINFO_TAG_TYPE_PLAIN:
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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      case FIELDINFO_TAG_OFFSET:
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        fatal("Setting the field type with overwriting");
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#endif
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    }
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    ShouldNotReachHere();
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  }
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  void set_contended_group(u2 val) {
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    u2 lo = _shorts[low_packed_offset];
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    switch(lo & FIELDINFO_TAG_MASK) {
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      case FIELDINFO_TAG_TYPE_PLAIN:
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        _shorts[low_packed_offset] |= FIELDINFO_TAG_TYPE_CONTENDED;
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        _shorts[high_packed_offset] = val;
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        return;
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#ifndef PRODUCT
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      case FIELDINFO_TAG_TYPE_CONTENDED:
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        fatal("Overwriting contended group");
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      case FIELDINFO_TAG_BLANK:
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        fatal("Setting contended group for the blank field");
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      case FIELDINFO_TAG_OFFSET:
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        fatal("Setting contended group for field with offset");
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#endif
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    }
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    ShouldNotReachHere();
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  }
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  bool is_internal() const {
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    return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0;
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  }
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  bool is_stable() const {
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    return (access_flags() & JVM_ACC_FIELD_STABLE) != 0;
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  }
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  void set_stable(bool z) {
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    if (z) _shorts[access_flags_offset] |=  JVM_ACC_FIELD_STABLE;
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    else   _shorts[access_flags_offset] &= ~JVM_ACC_FIELD_STABLE;
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  }
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  Symbol* lookup_symbol(int symbol_index) const {
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    assert(is_internal(), "only internal fields");
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    return vmSymbols::symbol_at((vmSymbols::SID)symbol_index);
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  }
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};
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#endif // SHARE_OOPS_FIELDINFO_HPP