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 /*

  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2009 Red Hat, Inc.

  * 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

  * questions.

  *

  */

 #ifndef SHARE_VM_SHARK_SHARKNATIVEWRAPPER_HPP

 #define SHARE_VM_SHARK_SHARKNATIVEWRAPPER_HPP

 #include "runtime/handles.hpp"

 #include "shark/llvmHeaders.hpp"

 #include "shark/sharkBuilder.hpp"

 #include "shark/sharkContext.hpp"

 #include "shark/sharkInvariants.hpp"

 #include "shark/sharkStack.hpp"

 class SharkNativeWrapper : public SharkCompileInvariants {

   friend class SharkStackWithNativeFrame;

  public:

   static SharkNativeWrapper* build(SharkBuilder* builder,

                                    methodHandle  target,

                                    const char*   name,

                                    BasicType*    arg_types,

                                    BasicType     return_type) {

     return new SharkNativeWrapper(builder,

                                   target,

                                   name,

                                   arg_types,

                                   return_type);

   }

  private:

   SharkNativeWrapper(SharkBuilder* builder,

                      methodHandle  target,

                      const char*   name,

                      BasicType*    arg_types,

                      BasicType     return_type)

     : SharkCompileInvariants(NULL, builder),

       _target(target),

       _arg_types(arg_types),

       _return_type(return_type),

       _lock_slot_offset(0) { initialize(name); }

  private:

   void initialize(const char* name);

  private:

   methodHandle    _target;

   BasicType*      _arg_types;

   BasicType       _return_type;

   llvm::Function* _function;

   SharkStack*     _stack;

   llvm::Value*    _oop_tmp_slot;

   OopMapSet*      _oop_maps;

   int             _receiver_slot_offset;

   int             _lock_slot_offset;

   // The method being compiled.

  protected:

   methodHandle target() const {

     return _target;

   }

   // Properties of the method.

  protected:

   int arg_size() const {

     return target()->size_of_parameters();

   }

   BasicType arg_type(int i) const {

     return _arg_types[i];

   }

   BasicType return_type() const {

     return _return_type;

   }

   bool is_static() const {

     return target()->is_static();

   }

   bool is_synchronized() const {

     return target()->is_synchronized();

   }

   bool is_returning_oop() const {

     return target()->is_returning_oop();

   }

   // The LLVM function we are building.

  public:

   llvm::Function* function() const {

     return _function;

   }

   // The Zero stack and our frame on it.

  protected:

   SharkStack* stack() const {

     return _stack;

   }

   // Temporary oop storage.

  protected:

   llvm::Value* oop_tmp_slot() const {

     assert(is_static() || is_returning_oop(), "should be");

     return _oop_tmp_slot;

   }

   // Information required by nmethod::new_native_nmethod().

  public:

   int frame_size() const {

     return stack()->oopmap_frame_size();

   }

   ByteSize receiver_offset() const {

     return in_ByteSize(_receiver_slot_offset * wordSize);

   }

   ByteSize lock_offset() const {

     return in_ByteSize(_lock_slot_offset * wordSize);

   }

   OopMapSet* oop_maps() const {

     return _oop_maps;

   }

   // Helpers.

  private:

   llvm::BasicBlock* CreateBlock(const char* name = "") const {

     return llvm::BasicBlock::Create(SharkContext::current(), name, function());

   }

   llvm::Value* thread_state_address() const {

     return builder()->CreateAddressOfStructEntry(

       thread(), JavaThread::thread_state_offset(),

       llvm::PointerType::getUnqual(SharkType::jint_type()),

       "thread_state_address");

   }

   llvm::Value* pending_exception_address() const {

     return builder()->CreateAddressOfStructEntry(

       thread(), Thread::pending_exception_offset(),

       llvm::PointerType::getUnqual(SharkType::oop_type()),

       "pending_exception_address");

   }

   void CreateSetThreadState(JavaThreadState state) const {

     builder()->CreateStore(

       LLVMValue::jint_constant(state), thread_state_address());

   }

   void CreateWriteMemorySerializePage() const {

     builder()->CreateStore(

       LLVMValue::jint_constant(1),

       builder()->CreateIntToPtr(

         builder()->CreateAdd(

           LLVMValue::intptr_constant(

             (intptr_t) os::get_memory_serialize_page()),

           builder()->CreateAnd(

             builder()->CreateLShr(

               builder()->CreatePtrToInt(thread(), SharkType::intptr_type()),

               LLVMValue::intptr_constant(os::get_serialize_page_shift_count())),

             LLVMValue::intptr_constant(os::get_serialize_page_mask()))),

         llvm::PointerType::getUnqual(SharkType::jint_type())));

   }

   void CreateResetHandleBlock() const {

     llvm::Value *active_handles = builder()->CreateValueOfStructEntry(

       thread(),

       JavaThread::active_handles_offset(),

       SharkType::jniHandleBlock_type(),

       "active_handles");

     builder()->CreateStore(

       LLVMValue::intptr_constant(0),

       builder()->CreateAddressOfStructEntry(

         active_handles,

         in_ByteSize(JNIHandleBlock::top_offset_in_bytes()),

         llvm::PointerType::getUnqual(SharkType::intptr_type()),

         "top"));

   }

   llvm::LoadInst* CreateLoadPendingException() const {

     return builder()->CreateLoad(

       pending_exception_address(), "pending_exception");

   }

 };

 #endif // SHARE_VM_SHARK_SHARKNATIVEWRAPPER_HPP