jdk8-mips64-public/hotspot: src/share/vm/oops/compiledICHolder.hpp@624a0741915c

     1 /*

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     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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    25 #ifndef SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

    26 #define SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

    28 #include "oops/oop.hpp"

    29 #include "oops/klass.hpp"

    30 #include "oops/method.hpp"

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

    33 // It holds:

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

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

    36 //

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

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

    39 // since they might be in use.

    40 //

    43 class CompiledICHolder : public CHeapObj<mtCompiler> {

    44   friend class VMStructs;

    45  private:

    46   static volatile int _live_count; // allocated

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

    48                                                // reachable by iterating over nmethods

    50   Metadata* _holder_metadata;

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

    52   CompiledICHolder* _next;

    53   bool _is_metadata_method;

    55  public:

    56   // Constructor

    57   CompiledICHolder(Metadata* metadata, Klass* klass, bool is_method = true)

    58       : _holder_metadata(metadata), _holder_klass(klass), _is_metadata_method(is_method) {

    59 #ifdef ASSERT

    60     Atomic::inc(&_live_count);

    61     Atomic::inc(&_live_not_claimed_count);

    62 #endif

    63   }

    65   ~CompiledICHolder() {

    66 #ifdef ASSERT

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

    68     Atomic::dec(&_live_count);

    69 #endif

    70   }

    72   static int live_count() { return _live_count; }

    73   static int live_not_claimed_count() { return _live_not_claimed_count; }

    75   // accessors

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

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

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

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

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

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

    85   CompiledICHolder* next()     { return _next; }

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

    88   inline bool is_loader_alive(BoolObjectClosure* is_alive) {

    89     Klass* k = _is_metadata_method ? ((Method*)_holder_metadata)->method_holder() : (Klass*)_holder_metadata;

    90     if (!k->is_loader_alive(is_alive)) {

    91       return false;

    92     }

    93     if (!_holder_klass->is_loader_alive(is_alive)) {

    94       return false;

    95     }

    96     return true;

    97   }

    99   // Verify

   100   void verify_on(outputStream* st);

   102   // Printing

   103   void print_on(outputStream* st) const;

   104   void print_value_on(outputStream* st) const;

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

   108   void claim() {

   109 #ifdef ASSERT

   110     Atomic::dec(&_live_not_claimed_count);

   111 #endif

   112   }

   113 };

   115 #endif // SHARE_VM_OOPS_COMPILEDICHOLDEROOP_HPP

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