jdk8-mips64-public/hotspot: src/share/vm/code/icBuffer.hpp@e2509677809c

8023037: Race between ciEnv::register_method and nmethod::make_not_entrant_or_zombie
Reviewed-by: kvn, iveresov

     1 /*

     2  * Copyright (c) 1997, 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_CODE_ICBUFFER_HPP

    26 #define SHARE_VM_CODE_ICBUFFER_HPP

    28 #include "asm/codeBuffer.hpp"

    29 #include "code/stubs.hpp"

    30 #include "interpreter/bytecodes.hpp"

    31 #include "memory/allocation.hpp"

    33 //

    34 // For CompiledIC's:

    35 //

    36 // In cases where we do not have MT-safe state transformation,

    37 // we go to a transition state, using ICStubs. At a safepoint,

    38 // the inline caches are transferred from the transitional code:

    39 //

    40 //    instruction_address --> 01 set xxx_oop, Ginline_cache_klass

    41 //                            23 jump_to Gtemp, yyyy

    42 //                            4  nop

    44 class ICStub: public Stub {

    45  private:

    46   int                 _size;       // total size of the stub incl. code

    47   address             _ic_site;    // points at call instruction of owning ic-buffer

    48   /* stub code follows here */

    49  protected:

    50   friend class ICStubInterface;

    51   // This will be called only by ICStubInterface

    52   void    initialize(int size,

    53                      CodeStrings strings)        { _size = size; _ic_site = NULL; }

    54   void    finalize(); // called when a method is removed

    56   // General info

    57   int     size() const                           { return _size; }

    58   static  int code_size_to_size(int code_size)   { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }

    60  public:

    61   // Creation

    62   void set_stub(CompiledIC *ic, void* cached_value, address dest_addr);

    64   // Code info

    65   address code_begin() const                     { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }

    66   address code_end() const                       { return (address)this + size(); }

    68   // Call site info

    69   address ic_site() const                        { return _ic_site; }

    70   void    clear();

    71   bool    is_empty() const                       { return _ic_site == NULL; }

    73   // stub info

    74   address destination() const;  // destination of jump instruction

    75   void* cached_value() const;   // cached_value for stub

    77   // Debugging

    78   void    verify()            PRODUCT_RETURN;

    79   void    print()             PRODUCT_RETURN;

    81   // Creation

    82   friend ICStub* ICStub_from_destination_address(address destination_address);

    83 };

    85 // ICStub Creation

    86 inline ICStub* ICStub_from_destination_address(address destination_address) {

    87   ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));

    88   #ifdef ASSERT

    89   stub->verify();

    90   #endif

    91   return stub;

    92 }

    94 class InlineCacheBuffer: public AllStatic {

    95  private:

    96   // friends

    97   friend class ICStub;

    99   static int ic_stub_code_size();

   101   static StubQueue* _buffer;

   102   static ICStub*    _next_stub;

   104   static CompiledICHolder* _pending_released;

   105   static int _pending_count;

   107   static StubQueue* buffer()                         { return _buffer;         }

   108   static void       set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }

   109   static ICStub*    get_next_stub()                  { return _next_stub;      }

   111   static void       init_next_stub();

   113   static ICStub* new_ic_stub();

   116   // Machine-dependent implementation of ICBuffer

   117   static void    assemble_ic_buffer_code(address code_begin, void* cached_value, address entry_point);

   118   static address ic_buffer_entry_point  (address code_begin);

   119   static void*   ic_buffer_cached_value (address code_begin);

   121  public:

   123     // Initialization; must be called before first usage

   124   static void initialize();

   126   // Access

   127   static bool contains(address instruction_address);

   129     // removes the ICStubs after backpatching

   130   static void update_inline_caches();

   132   // for debugging

   133   static bool is_empty();

   135   static void release_pending_icholders();

   136   static void queue_for_release(CompiledICHolder* icholder);

   137   static int pending_icholder_count() { return _pending_count; }

   139   // New interface

   140   static void    create_transition_stub(CompiledIC *ic, void* cached_value, address entry);

   141   static address ic_destination_for(CompiledIC *ic);

   142   static void*   cached_value_for(CompiledIC *ic);

   143 };

   145 #endif // SHARE_VM_CODE_ICBUFFER_HPP

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