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 /*

  * Copyright (c) 1997, 2005, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

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  */

 //-----------------------------------------------------------------------------

 // The CompiledIC represents a compiled inline cache.

 //

 // In order to make patching of the inline cache MT-safe, we only allow the following

 // transitions (when not at a safepoint):

 //

 //

 //         [1] --<--  Clean -->---  [1]

 //            /       (null)      \

 //           /                     \      /-<-\

 //          /          [2]          \    /     \

 //      Interpreted  ---------> Monomorphic     | [3]

 //  (compiledICHolderOop)        (klassOop)     |

 //          \                        /   \     /

 //       [4] \                      / [4] \->-/

 //            \->-  Megamorphic -<-/

 //                  (methodOop)

 //

 // The text in paranteses () refere to the value of the inline cache receiver (mov instruction)

 //

 // The numbers in square brackets refere to the kind of transition:

 // [1]: Initial fixup. Receiver it found from debug information

 // [2]: Compilation of a method

 // [3]: Recompilation of a method (note: only entry is changed. The klassOop must stay the same)

 // [4]: Inline cache miss. We go directly to megamorphic call.

 //

 // The class automatically inserts transition stubs (using the InlineCacheBuffer) when an MT-unsafe

 // transition is made to a stub.

 //

 class CompiledIC;

 class CompiledICInfo {

   friend class CompiledIC;

  private:

   address _entry;              // entry point for call

   Handle  _cached_oop;         // Value of cached_oop (either in stub or inline cache)

   bool    _is_optimized;       // it is an optimized virtual call (i.e., can be statically bound)

   bool    _to_interpreter;     // Call it to interpreter

  public:

   address entry() const        { return _entry; }

   Handle  cached_oop() const   { return _cached_oop; }

   bool    is_optimized() const { return _is_optimized; }

 };

 class CompiledIC: public ResourceObj {

   friend class InlineCacheBuffer;

   friend class ICStub;

  private:

   NativeCall*   _ic_call;       // the call instruction

   oop*          _oop_addr;      // patchable oop cell for this IC

   RelocIterator _oops;          // iteration over any and all set-oop instructions

   bool          _is_optimized;  // an optimized virtual call (i.e., no compiled IC)

   CompiledIC(NativeCall* ic_call);

   CompiledIC(Relocation* ic_reloc);    // Must be of virtual_call_type/opt_virtual_call_type

   // low-level inline-cache manipulation. Cannot be accessed directly, since it might not be MT-safe

   // to change an inline-cache. These changes the underlying inline-cache directly. They *newer* make

   // changes to a transition stub.

   void set_ic_destination(address entry_point);

   void set_cached_oop(oop cache);

   // Reads the location of the transition stub. This will fail with an assertion, if no transition stub is

   // associated with the inline cache.

   address stub_address() const;

   bool is_in_transition_state() const;  // Use InlineCacheBuffer

  public:

   // conversion (machine PC to CompiledIC*)

   friend CompiledIC* CompiledIC_before(address return_addr);

   friend CompiledIC* CompiledIC_at(address call_site);

   friend CompiledIC* CompiledIC_at(Relocation* call_site);

   // Return the cached_oop/destination associated with this inline cache. If the cache currently points

   // to a transition stub, it will read the values from the transition stub.

   oop  cached_oop() const;

   address ic_destination() const;

   bool is_optimized() const   { return _is_optimized; }

   // State

   bool is_clean() const;

   bool is_megamorphic() const;

   bool is_call_to_compiled() const;

   bool is_call_to_interpreted() const;

   address end_of_call() { return  _ic_call->return_address(); }

   // MT-safe patching of inline caches. Note: Only safe to call is_xxx when holding the CompiledIC_ock

   // so you are guaranteed that no patching takes place. The same goes for verify.

   //

   // Note: We do not provide any direct access to the stub code, to prevent parts of the code

   // to manipulate the inline cache in MT-unsafe ways.

   //

   // They all takes a TRAP argument, since they can cause a GC if the inline-cache buffer is full.

   //

   void set_to_clean();  // Can only be called during a safepoint operation

   void set_to_monomorphic(const CompiledICInfo& info);

   void set_to_megamorphic(CallInfo* call_info, Bytecodes::Code bytecode, TRAPS);

   static void compute_monomorphic_entry(methodHandle method, KlassHandle receiver_klass,

                                         bool is_optimized, bool static_bound, CompiledICInfo& info, TRAPS);

   // Location

   address instruction_address() const { return _ic_call->instruction_address(); }

   // Misc

   void print()             PRODUCT_RETURN;

   void print_compiled_ic() PRODUCT_RETURN;

   void verify()            PRODUCT_RETURN;

 };

 inline CompiledIC* CompiledIC_before(address return_addr) {

   CompiledIC* c_ic = new CompiledIC(nativeCall_before(return_addr));

   c_ic->verify();

   return c_ic;

 }

 inline CompiledIC* CompiledIC_at(address call_site) {

   CompiledIC* c_ic = new CompiledIC(nativeCall_at(call_site));

   c_ic->verify();

   return c_ic;

 }

 inline CompiledIC* CompiledIC_at(Relocation* call_site) {

   CompiledIC* c_ic = new CompiledIC(call_site);

   c_ic->verify();

   return c_ic;

 }

 //-----------------------------------------------------------------------------

 // The CompiledStaticCall represents a call to a static method in the compiled

 //

 // Transition diagram of a static call site is somewhat simpler than for an inlined cache:

 //

 //

 //           -----<----- Clean ----->-----

 //          /                             \

 //         /                               \

 //    compilled code <------------> interpreted code

 //

 //  Clean:            Calls directly to runtime method for fixup

 //  Compiled code:    Calls directly to compiled code

 //  Interpreted code: Calls to stub that set methodOop reference

 //

 //

 class CompiledStaticCall;

 class StaticCallInfo {

  private:

   address      _entry;          // Entrypoint

   methodHandle _callee;         // Callee (used when calling interpreter)

   bool         _to_interpreter; // call to interpreted method (otherwise compiled)

   friend class CompiledStaticCall;

  public:

   address      entry() const    { return _entry;  }

   methodHandle callee() const   { return _callee; }

 };

 class CompiledStaticCall: public NativeCall {

   friend class CompiledIC;

   // Also used by CompiledIC

   void set_to_interpreted(methodHandle callee, address entry);

   bool is_optimized_virtual();

  public:

   friend CompiledStaticCall* compiledStaticCall_before(address return_addr);

   friend CompiledStaticCall* compiledStaticCall_at(address native_call);

   friend CompiledStaticCall* compiledStaticCall_at(Relocation* call_site);

   // State

   bool is_clean() const;

   bool is_call_to_compiled() const;

   bool is_call_to_interpreted() const;

   // Clean static call (will force resolving on next use)

   void set_to_clean();

   // Set state. The entry must be the same, as computed by compute_entry.

   // Computation and setting is split up, since the actions are separate during

   // a OptoRuntime::resolve_xxx.

   void set(const StaticCallInfo& info);

   // Compute entry point given a method

   static void compute_entry(methodHandle m, StaticCallInfo& info);

   // Stub support

   address find_stub();

   static void set_stub_to_clean(static_stub_Relocation* static_stub);

   // Misc.

   void print()  PRODUCT_RETURN;

   void verify() PRODUCT_RETURN;

 };

 inline CompiledStaticCall* compiledStaticCall_before(address return_addr) {

   CompiledStaticCall* st = (CompiledStaticCall*)nativeCall_before(return_addr);

   st->verify();

   return st;

 }

 inline CompiledStaticCall* compiledStaticCall_at(address native_call) {

   CompiledStaticCall* st = (CompiledStaticCall*)native_call;

   st->verify();

   return st;

 }

 inline CompiledStaticCall* compiledStaticCall_at(Relocation* call_site) {

   return compiledStaticCall_at(call_site->addr());

 }