jdk8-mips64-public/hotspot: src/share/vm/oops/fieldInfo.hpp@cc6a617fffd2

8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
Summary: Relocate functions with jsr's when rewriting so not repeated after reading shared archive
Reviewed-by: twisti, jrose

     1 /*

     2  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_OOPS_FIELDINFO_HPP

    26 #define SHARE_VM_OOPS_FIELDINFO_HPP

    28 #include "oops/constantPool.hpp"

    29 #include "oops/typeArrayOop.hpp"

    30 #include "classfile/vmSymbols.hpp"

    32 // This class represents the field information contained in the fields

    33 // array of an InstanceKlass.  Currently it's laid on top an array of

    34 // Java shorts but in the future it could simply be used as a real

    35 // array type.  FieldInfo generally shouldn't be used directly.

    36 // Fields should be queried either through InstanceKlass or through

    37 // the various FieldStreams.

    38 class FieldInfo VALUE_OBJ_CLASS_SPEC {

    39   friend class fieldDescriptor;

    40   friend class JavaFieldStream;

    41   friend class ClassFileParser;

    43  public:

    44   // fields

    45   // Field info extracted from the class file and stored

    46   // as an array of 7 shorts

    47   enum FieldOffset {

    48     access_flags_offset      = 0,

    49     name_index_offset        = 1,

    50     signature_index_offset   = 2,

    51     initval_index_offset     = 3,

    52     low_offset               = 4,

    53     high_offset              = 5,

    54     field_slots              = 6

    55   };

    57  private:

    58   u2 _shorts[field_slots];

    60   void set_name_index(u2 val)                    { _shorts[name_index_offset] = val;         }

    61   void set_signature_index(u2 val)               { _shorts[signature_index_offset] = val;    }

    62   void set_initval_index(u2 val)                 { _shorts[initval_index_offset] = val;      }

    64   u2 name_index() const                          { return _shorts[name_index_offset];        }

    65   u2 signature_index() const                     { return _shorts[signature_index_offset];   }

    66   u2 initval_index() const                       { return _shorts[initval_index_offset];     }

    68  public:

    69   static FieldInfo* from_field_array(Array<u2>* fields, int index) {

    70     return ((FieldInfo*)fields->adr_at(index * field_slots));

    71   }

    72   static FieldInfo* from_field_array(u2* fields, int index) {

    73     return ((FieldInfo*)(fields + index * field_slots));

    74   }

    76   void initialize(u2 access_flags,

    77                   u2 name_index,

    78                   u2 signature_index,

    79                   u2 initval_index,

    80                   u4 offset) {

    81     _shorts[access_flags_offset] = access_flags;

    82     _shorts[name_index_offset] = name_index;

    83     _shorts[signature_index_offset] = signature_index;

    84     _shorts[initval_index_offset] = initval_index;

    85     set_offset(offset);

    86   }

    88   u2 access_flags() const                        { return _shorts[access_flags_offset];            }

    89   u4 offset() const                              { return build_int_from_shorts(_shorts[low_offset], _shorts[high_offset]); }

    91   Symbol* name(constantPoolHandle cp) const {

    92     int index = name_index();

    93     if (is_internal()) {

    94       return lookup_symbol(index);

    95     }

    96     return cp->symbol_at(index);

    97   }

    99   Symbol* signature(constantPoolHandle cp) const {

   100     int index = signature_index();

   101     if (is_internal()) {

   102       return lookup_symbol(index);

   103     }

   104     return cp->symbol_at(index);

   105   }

   107   void set_access_flags(u2 val)                  { _shorts[access_flags_offset] = val;             }

   108   void set_offset(u4 val)                        {

   109     _shorts[low_offset] = extract_low_short_from_int(val);

   110     _shorts[high_offset] = extract_high_short_from_int(val);

   111   }

   113   bool is_internal() const {

   114     return (access_flags() & JVM_ACC_FIELD_INTERNAL) != 0;

   115   }

   117   Symbol* lookup_symbol(int symbol_index) const {

   118     assert(is_internal(), "only internal fields");

   119     return vmSymbols::symbol_at((vmSymbols::SID)symbol_index);

   120   }

   121 };

   123 #endif // SHARE_VM_OOPS_FIELDINFO_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/oops/fieldInfo.hpp@cc6a617fffd2

src/share/vm/oops/fieldInfo.hpp