duke@435: /*
duke@435:  * Copyright 1997-2003 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: //
duke@435: // For CompiledIC's:
duke@435: //
duke@435: // In cases where we do not have MT-safe state transformation,
duke@435: // we go to a transition state, using ICStubs. At a safepoint,
duke@435: // the inline caches are transferred from the transitional code:
duke@435: //
duke@435: //    instruction_address --> 01 set xxx_oop, Ginline_cache_klass
duke@435: //                            23 jump_to Gtemp, yyyy
duke@435: //                            4  nop
duke@435: 
duke@435: class ICStub: public Stub {
duke@435:  private:
duke@435:   int                 _size;       // total size of the stub incl. code
duke@435:   address             _ic_site;    // points at call instruction of owning ic-buffer
duke@435:   /* stub code follows here */
duke@435:  protected:
duke@435:   friend class ICStubInterface;
duke@435:   // This will be called only by ICStubInterface
duke@435:   void    initialize(int size) { _size = size; _ic_site = NULL; }
duke@435:   void    finalize(); // called when a method is removed
duke@435: 
duke@435:   // General info
duke@435:   int     size() const                           { return _size; }
duke@435:   static  int code_size_to_size(int code_size)   { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
duke@435: 
duke@435:  public:
duke@435:   // Creation
duke@435:   void set_stub(CompiledIC *ic, oop cached_value, address dest_addr);
duke@435: 
duke@435:   // Code info
duke@435:   address code_begin() const                     { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
duke@435:   address code_end() const                       { return (address)this + size(); }
duke@435: 
duke@435:   // Call site info
duke@435:   address ic_site() const                        { return _ic_site; }
duke@435:   void    clear();
duke@435:   bool    is_empty() const                       { return _ic_site == NULL; }
duke@435: 
duke@435:   // stub info
duke@435:   address destination() const;  // destination of jump instruction
duke@435:   oop     cached_oop() const;   // cached_oop for stub
duke@435: 
duke@435:   // Debugging
duke@435:   void    verify()            PRODUCT_RETURN;
duke@435:   void    print()             PRODUCT_RETURN;
duke@435: 
duke@435:   // Creation
duke@435:   friend ICStub* ICStub_from_destination_address(address destination_address);
duke@435: };
duke@435: 
duke@435: // ICStub Creation
duke@435: inline ICStub* ICStub_from_destination_address(address destination_address) {
duke@435:   ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
duke@435:   #ifdef ASSERT
duke@435:   stub->verify();
duke@435:   #endif
duke@435:   return stub;
duke@435: }
duke@435: 
duke@435: class InlineCacheBuffer: public AllStatic {
duke@435:  private:
duke@435:   // friends
duke@435:   friend class ICStub;
duke@435: 
duke@435:   static int ic_stub_code_size();
duke@435: 
duke@435:   static StubQueue* _buffer;
duke@435:   static ICStub*    _next_stub;
duke@435: 
duke@435:   static StubQueue* buffer()                         { return _buffer;         }
duke@435:   static void       set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
duke@435:   static ICStub*    get_next_stub()                  { return _next_stub;      }
duke@435: 
duke@435:   static void       init_next_stub();
duke@435: 
duke@435:   static ICStub* new_ic_stub();
duke@435: 
duke@435: 
duke@435:   // Machine-dependent implementation of ICBuffer
duke@435:   static void    assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);
duke@435:   static address ic_buffer_entry_point  (address code_begin);
duke@435:   static oop     ic_buffer_cached_oop   (address code_begin);
duke@435: 
duke@435:  public:
duke@435: 
duke@435:     // Initialization; must be called before first usage
duke@435:   static void initialize();
duke@435: 
duke@435:   // Access
duke@435:   static bool contains(address instruction_address);
duke@435: 
duke@435:     // removes the ICStubs after backpatching
duke@435:   static void update_inline_caches();
duke@435: 
duke@435:   // for debugging
duke@435:   static bool is_empty();
duke@435: 
duke@435: 
duke@435:   // New interface
duke@435:   static void    create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);
duke@435:   static address ic_destination_for(CompiledIC *ic);
duke@435:   static oop     cached_oop_for(CompiledIC *ic);
duke@435: };