jdk8-mips64-public/hotspot: src/share/vm/code/icBuffer.hpp@e9ff18c4ace7

     1 /*

     2  * Copyright (c) 1997, 2003, 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 //

    26 // For CompiledIC's:

    27 //

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

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

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

    31 //

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

    33 //                            23 jump_to Gtemp, yyyy

    34 //                            4  nop

    36 class ICStub: public Stub {

    37  private:

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

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

    40   /* stub code follows here */

    41  protected:

    42   friend class ICStubInterface;

    43   // This will be called only by ICStubInterface

    44   void    initialize(int size) { _size = size; _ic_site = NULL; }

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

    47   // General info

    48   int     size() const                           { return _size; }

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

    51  public:

    52   // Creation

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

    55   // Code info

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

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

    59   // Call site info

    60   address ic_site() const                        { return _ic_site; }

    61   void    clear();

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

    64   // stub info

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

    66   oop     cached_oop() const;   // cached_oop for stub

    68   // Debugging

    69   void    verify()            PRODUCT_RETURN;

    70   void    print()             PRODUCT_RETURN;

    72   // Creation

    73   friend ICStub* ICStub_from_destination_address(address destination_address);

    74 };

    76 // ICStub Creation

    77 inline ICStub* ICStub_from_destination_address(address destination_address) {

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

    79   #ifdef ASSERT

    80   stub->verify();

    81   #endif

    82   return stub;

    83 }

    85 class InlineCacheBuffer: public AllStatic {

    86  private:

    87   // friends

    88   friend class ICStub;

    90   static int ic_stub_code_size();

    92   static StubQueue* _buffer;

    93   static ICStub*    _next_stub;

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

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

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

    99   static void       init_next_stub();

   101   static ICStub* new_ic_stub();

   104   // Machine-dependent implementation of ICBuffer

   105   static void    assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);

   106   static address ic_buffer_entry_point  (address code_begin);

   107   static oop     ic_buffer_cached_oop   (address code_begin);

   109  public:

   111     // Initialization; must be called before first usage

   112   static void initialize();

   114   // Access

   115   static bool contains(address instruction_address);

   117     // removes the ICStubs after backpatching

   118   static void update_inline_caches();

   120   // for debugging

   121   static bool is_empty();

   124   // New interface

   125   static void    create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);

   126   static address ic_destination_for(CompiledIC *ic);

   127   static oop     cached_oop_for(CompiledIC *ic);

   128 };

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