--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/code/icBuffer.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,128 @@
+/*
+ * Copyright 1997-2003 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+//
+// For CompiledIC's:
+//
+// In cases where we do not have MT-safe state transformation,
+// we go to a transition state, using ICStubs. At a safepoint,
+// the inline caches are transferred from the transitional code:
+//
+//    instruction_address --> 01 set xxx_oop, Ginline_cache_klass
+//                            23 jump_to Gtemp, yyyy
+//                            4  nop
+
+class ICStub: public Stub {
+ private:
+  int                 _size;       // total size of the stub incl. code
+  address             _ic_site;    // points at call instruction of owning ic-buffer
+  /* stub code follows here */
+ protected:
+  friend class ICStubInterface;
+  // This will be called only by ICStubInterface
+  void    initialize(int size) { _size = size; _ic_site = NULL; }
+  void    finalize(); // called when a method is removed
+
+  // General info
+  int     size() const                           { return _size; }
+  static  int code_size_to_size(int code_size)   { return round_to(sizeof(ICStub), CodeEntryAlignment) + code_size; }
+
+ public:
+  // Creation
+  void set_stub(CompiledIC *ic, oop cached_value, address dest_addr);
+
+  // Code info
+  address code_begin() const                     { return (address)this + round_to(sizeof(ICStub), CodeEntryAlignment); }
+  address code_end() const                       { return (address)this + size(); }
+
+  // Call site info
+  address ic_site() const                        { return _ic_site; }
+  void    clear();
+  bool    is_empty() const                       { return _ic_site == NULL; }
+
+  // stub info
+  address destination() const;  // destination of jump instruction
+  oop     cached_oop() const;   // cached_oop for stub
+
+  // Debugging
+  void    verify()            PRODUCT_RETURN;
+  void    print()             PRODUCT_RETURN;
+
+  // Creation
+  friend ICStub* ICStub_from_destination_address(address destination_address);
+};
+
+// ICStub Creation
+inline ICStub* ICStub_from_destination_address(address destination_address) {
+  ICStub* stub = (ICStub*) (destination_address - round_to(sizeof(ICStub), CodeEntryAlignment));
+  #ifdef ASSERT
+  stub->verify();
+  #endif
+  return stub;
+}
+
+class InlineCacheBuffer: public AllStatic {
+ private:
+  // friends
+  friend class ICStub;
+
+  static int ic_stub_code_size();
+
+  static StubQueue* _buffer;
+  static ICStub*    _next_stub;
+
+  static StubQueue* buffer()                         { return _buffer;         }
+  static void       set_next_stub(ICStub* next_stub) { _next_stub = next_stub; }
+  static ICStub*    get_next_stub()                  { return _next_stub;      }
+
+  static void       init_next_stub();
+
+  static ICStub* new_ic_stub();
+
+
+  // Machine-dependent implementation of ICBuffer
+  static void    assemble_ic_buffer_code(address code_begin, oop cached_oop, address entry_point);
+  static address ic_buffer_entry_point  (address code_begin);
+  static oop     ic_buffer_cached_oop   (address code_begin);
+
+ public:
+
+    // Initialization; must be called before first usage
+  static void initialize();
+
+  // Access
+  static bool contains(address instruction_address);
+
+    // removes the ICStubs after backpatching
+  static void update_inline_caches();
+
+  // for debugging
+  static bool is_empty();
+
+
+  // New interface
+  static void    create_transition_stub(CompiledIC *ic, oop cached_oop, address entry);
+  static address ic_destination_for(CompiledIC *ic);
+  static oop     cached_oop_for(CompiledIC *ic);
+};