jdk8-mips64-public/hotspot: src/share/vm/oops/compiledICHolder.hpp@f8a45a60bc6b

8174962: Better interface invocations
Reviewed-by: jrose, coleenp, ahgross, acorn, vlivanov

     1 /*

     2  * Copyright (c) 1998, 2017, 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_COMPILEDICHOLDEROOP_HPP

    26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

    28 #include "oops/oop.hpp"

    30 // A CompiledICHolder* is a helper object for the inline cache implementation.

    31 // It holds:

    32 //   (1) (method+klass pair) when converting from compiled to an interpreted call

    33 //   (2) (klass+klass pair) when calling itable stub from megamorphic compiled call

    34 //

    35 // These are always allocated in the C heap and are freed during a

    36 // safepoint by the ICBuffer logic.  It's unsafe to free them earlier

    37 // since they might be in use.

    38 //

    41 class CompiledICHolder : public CHeapObj<mtCompiler> {

    42   friend class VMStructs;

    43  private:

    44   static volatile int _live_count; // allocated

    45   static volatile int _live_not_claimed_count; // allocated but not yet in use so not

    46                                                // reachable by iterating over nmethods

    48   Metadata* _holder_metadata;

    49   Klass*    _holder_klass;    // to avoid name conflict with oopDesc::_klass

    50   CompiledICHolder* _next;

    52  public:

    53   // Constructor

    54   CompiledICHolder(Metadata* metadata, Klass* klass)

    55       : _holder_metadata(metadata), _holder_klass(klass) {

    56 #ifdef ASSERT

    57     Atomic::inc(&_live_count);

    58     Atomic::inc(&_live_not_claimed_count);

    59 #endif

    60   }

    62   ~CompiledICHolder() {

    63 #ifdef ASSERT

    64     assert(_live_count > 0, "underflow");

    65     Atomic::dec(&_live_count);

    66 #endif

    67   }

    69   static int live_count() { return _live_count; }

    70   static int live_not_claimed_count() { return _live_not_claimed_count; }

    72   // accessors

    73   Klass*    holder_klass()  const     { return _holder_klass; }

    74   Metadata* holder_metadata() const   { return _holder_metadata; }

    76   void set_holder_metadata(Metadata* m) { _holder_metadata = m; }

    77   void set_holder_klass(Klass* k)     { _holder_klass = k; }

    79   static int holder_metadata_offset() { return offset_of(CompiledICHolder, _holder_metadata); }

    80   static int holder_klass_offset()    { return offset_of(CompiledICHolder, _holder_klass); }

    82   CompiledICHolder* next()     { return _next; }

    83   void set_next(CompiledICHolder* n) { _next = n; }

    85   bool is_loader_alive(BoolObjectClosure* is_alive);

    87   // Verify

    88   void verify_on(outputStream* st);

    90   // Printing

    91   void print_on(outputStream* st) const;

    92   void print_value_on(outputStream* st) const;

    94   const char* internal_name() const { return "{compiledICHolder}"; }

    96   void claim() {

    97 #ifdef ASSERT

    98     Atomic::dec(&_live_not_claimed_count);

    99 #endif

   100   }

   101 };

   103 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

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