/*

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

 * Copyright 2008, 2009, 2010, 2011 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_SHARKCOMPILER_HPP

#define SHARE_VM_SHARK_SHARKCOMPILER_HPP

#include "ci/ciEnv.hpp"

#include "ci/ciMethod.hpp"

#include "compiler/abstractCompiler.hpp"

#include "compiler/compileBroker.hpp"

#include "shark/llvmHeaders.hpp"

#include "shark/sharkMemoryManager.hpp"

class SharkContext;

class SharkCompiler : public AbstractCompiler {

 public:

  // Creation

  SharkCompiler();

  // Name of this compiler

  const char *name()     { return "shark"; }

  // Missing feature tests

  bool supports_native() { return true; }

  bool supports_osr()    { return true; }

  bool can_compile_method(methodHandle method)  {

    return ! (method->is_method_handle_intrinsic() || method->is_compiled_lambda_form());

  }

  // Customization

  bool needs_adapters()  { return false; }

  bool needs_stubs()     { return false; }

  // Initialization

  void initialize();

  // Compile a normal (bytecode) method and install it in the VM

  void compile_method(ciEnv* env, ciMethod* target, int entry_bci);

  // Generate a wrapper for a native (JNI) method

  nmethod* generate_native_wrapper(MacroAssembler* masm,

                                   methodHandle    target,

                                   int             compile_id,

                                   BasicType*      arg_types,

                                   BasicType       return_type);

  // Free compiled methods (and native wrappers)

  void free_compiled_method(address code);

  // Each thread generating IR needs its own context.  The normal

  // context is used for bytecode methods, and is protected from

  // multiple simultaneous accesses by being restricted to the

  // compiler thread.  The native context is used for JNI methods,

  // and is protected from multiple simultaneous accesses by the

  // adapter handler library lock.

 private:

  SharkContext* _normal_context;

  SharkContext* _native_context;

 public:

  SharkContext* context() const {

    if (JavaThread::current()->is_Compiler_thread()) {

      return _normal_context;

    }

    else {

      assert(AdapterHandlerLibrary_lock->owned_by_self(), "should be");

      return _native_context;

    }

  }

  // The LLVM execution engine is the JIT we use to generate native

  // code.  It is thread safe, but we need to protect it with a lock

  // of our own because otherwise LLVM's lock and HotSpot's locks

  // interleave and deadlock.  The SharkMemoryManager is not thread

  // safe, and is protected by the same lock as the execution engine.

 private:

  Monitor*               _execution_engine_lock;

  SharkMemoryManager*    _memory_manager;

  llvm::ExecutionEngine* _execution_engine;

 private:

  Monitor* execution_engine_lock() const {

    return _execution_engine_lock;

  }

  SharkMemoryManager* memory_manager() const {

    assert(execution_engine_lock()->owned_by_self(), "should be");

    return _memory_manager;

  }

  llvm::ExecutionEngine* execution_engine() const {

    assert(execution_engine_lock()->owned_by_self(), "should be");

    return _execution_engine;

  }

  // Global access

 public:

  static SharkCompiler* compiler() {

    AbstractCompiler *compiler =

      CompileBroker::compiler(CompLevel_full_optimization);

    assert(compiler->is_shark() && compiler->is_initialized(), "should be");

    return (SharkCompiler *) compiler;

  }

  // Helpers

 private:

  static const char* methodname(const char* klass, const char* method);

  void generate_native_code(SharkEntry*     entry,

                            llvm::Function* function,

                            const char*     name);

  void free_queued_methods();

};

#endif // SHARE_VM_SHARK_SHARKCOMPILER_HPP