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Java example source code file (abstractCompiler.hpp)

This example Java source code file (abstractCompiler.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

cheapobj, compiler1, compiler2, share_vm_compiler_abstractcompiler_hpp, shark, shouldnotreachhere, tiered

The abstractCompiler.hpp Java example source code

/*
 * Copyright (c) 1999, 2013, 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

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