/*

 * 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.

 *

 */

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");

  }

};