src/share/vm/oops/instanceMirrorKlass.hpp

Thu, 26 Sep 2013 10:25:02 -0400

author
hseigel
date
Thu, 26 Sep 2013 10:25:02 -0400
changeset 5784
190899198332
parent 4542
db9981fd3124
child 6876
710a3c8b516e
permissions
-rw-r--r--

7195622: CheckUnhandledOops has limited usefulness now
Summary: Enable CHECK_UNHANDLED_OOPS in fastdebug builds across all supported platforms.
Reviewed-by: coleenp, hseigel, dholmes, stefank, twisti, ihse, rdurbin
Contributed-by: lois.foltan@oracle.com

     1 /*
     2  * Copyright (c) 2011, 2013, 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
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    22  *
    23  */
    25 #ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
    26 #define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
    28 #include "classfile/systemDictionary.hpp"
    29 #include "oops/instanceKlass.hpp"
    30 #include "runtime/handles.hpp"
    31 #include "utilities/macros.hpp"
    33 // An InstanceMirrorKlass is a specialized InstanceKlass for
    34 // java.lang.Class instances.  These instances are special because
    35 // they contain the static fields of the class in addition to the
    36 // normal fields of Class.  This means they are variable sized
    37 // instances and need special logic for computing their size and for
    38 // iteration of their oops.
    41 class InstanceMirrorKlass: public InstanceKlass {
    42   friend class VMStructs;
    43   friend class InstanceKlass;
    45  private:
    46   static int _offset_of_static_fields;
    48   // Constructor
    49   InstanceMirrorKlass(int vtable_len, int itable_len, int static_field_size, int nonstatic_oop_map_size, ReferenceType rt, AccessFlags access_flags,  bool is_anonymous)
    50     : InstanceKlass(vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt, access_flags, is_anonymous) {}
    52  public:
    53   InstanceMirrorKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
    54   // Type testing
    55   bool oop_is_instanceMirror() const             { return true; }
    57   // Casting from Klass*
    58   static InstanceMirrorKlass* cast(Klass* k) {
    59     assert(k->oop_is_instanceMirror(), "cast to InstanceMirrorKlass");
    60     return (InstanceMirrorKlass*) k;
    61   }
    63   // Returns the size of the instance including the extra static fields.
    64   virtual int oop_size(oop obj) const;
    66   // Static field offset is an offset into the Heap, should be converted by
    67   // based on UseCompressedOop for traversal
    68   static HeapWord* start_of_static_fields(oop obj) {
    69     return (HeapWord*)(cast_from_oop<intptr_t>(obj) + offset_of_static_fields());
    70   }
    72   static void init_offset_of_static_fields() {
    73     // Cache the offset of the static fields in the Class instance
    74     assert(_offset_of_static_fields == 0, "once");
    75     _offset_of_static_fields = InstanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
    76   }
    78   static int offset_of_static_fields() {
    79     return _offset_of_static_fields;
    80   }
    82   int compute_static_oop_field_count(oop obj);
    84   // Given a Klass return the size of the instance
    85   int instance_size(KlassHandle k);
    87   // allocation
    88   instanceOop allocate_instance(KlassHandle k, TRAPS);
    90   // Garbage collection
    91   int  oop_adjust_pointers(oop obj);
    92   void oop_follow_contents(oop obj);
    94   // Parallel Scavenge and Parallel Old
    95   PARALLEL_GC_DECLS
    97   int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
    98     return oop_oop_iterate_v(obj, blk);
    99   }
   100   int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
   101     return oop_oop_iterate_v_m(obj, blk, mr);
   102   }
   104 #define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)           \
   105   int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                       \
   106   int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
   108   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
   109   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
   111 #if INCLUDE_ALL_GCS
   112 #define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
   113   int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
   115   ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
   116   ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
   117 #endif // INCLUDE_ALL_GCS
   118 };
   120 #endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP

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