/*

 * Copyright (c) 1999, 2012, 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

 * questions.

 *

 */

#ifndef SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP

#define SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP

#include "ci/compilerInterface.hpp"

class AbstractCompiler : public CHeapObj<mtCompiler> {

 private:

  volatile int _num_compiler_threads;

 protected:

  volatile int _compiler_state;

  // Used for tracking global state of compiler runtime initialization

  enum { uninitialized, initializing, initialized, failed, shut_down };

  // This method returns true for the first compiler thread that reaches that methods.

  // This thread will initialize the compiler runtime.

  bool should_perform_init();

 public:

  AbstractCompiler() : _compiler_state(uninitialized), _num_compiler_threads(0) {}

  // This function determines the compiler thread that will perform the

  // shutdown of the corresponding compiler runtime.

  bool should_perform_shutdown();

  // Name of this compiler

  virtual const char* name() = 0;

  // Missing feature tests

  virtual bool supports_native()                 { return true; }

  virtual bool supports_osr   ()                 { return true; }

  virtual bool can_compile_method(methodHandle method)  { return true; }

#if defined(TIERED) || ( !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK))

  virtual bool is_c1   ()                        { return false; }

  virtual bool is_c2   ()                        { return false; }

  virtual bool is_shark()                        { return false; }

#else

#ifdef COMPILER1

  bool is_c1   ()                                { return true; }

  bool is_c2   ()                                { return false; }

  bool is_shark()                                { return false; }

#endif // COMPILER1

#ifdef COMPILER2

  bool is_c1   ()                                { return false; }

  bool is_c2   ()                                { return true; }

  bool is_shark()                                { return false; }

#endif // COMPILER2

#ifdef SHARK

  bool is_c1   ()                                { return false; }

  bool is_c2   ()                                { return false; }

  bool is_shark()                                { return true; }

#endif // SHARK

#endif // TIERED

  // Customization

  virtual void initialize () = 0;

  void set_num_compiler_threads(int num) { _num_compiler_threads = num;  }

  int num_compiler_threads()             { return _num_compiler_threads; }

  // Get/set state of compiler objects

  bool is_initialized()           { return _compiler_state == initialized; }

  bool is_failed     ()           { return _compiler_state == failed;}

  void set_state     (int state);

  void set_shut_down ()           { set_state(shut_down); }

  // Compilation entry point for methods

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

    ShouldNotReachHere();

  }

  // Print compilation timers and statistics

  virtual void print_timers() {

    ShouldNotReachHere();

  }

};

#endif // SHARE_VM_COMPILER_ABSTRACTCOMPILER_HPP