jdk8-mips64-public/hotspot: src/share/vm/oops/fieldInfo.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/fieldInfo.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/fieldInfo.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/fieldInfo.hpp@f90c822e73f8 (annotated)

src/share/vm/oops/fieldInfo.hpp