/*

 * Copyright (c) 1997, 2019, 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.

 *

 */

#include "memory/allocation.hpp"

#include "utilities/ostream.hpp"

// The BytecodeTracer is a helper class used by the interpreter for run-time

// bytecode tracing. If bytecode tracing is turned on, trace() will be called

// for each bytecode.

//

// By specialising the BytecodeClosure, all kinds of bytecode traces can

// be done.

// class BytecodeTracer is used by TraceBytecodes option and PrintMethodData

class methodHandle;

class BytecodeClosure;

class BytecodeTracer: AllStatic {

 private:

  static BytecodeClosure* _closure;

 public:

  static BytecodeClosure* std_closure();                        // a printing closure

  static BytecodeClosure* closure()                                                   { return _closure; }

  static void             set_closure(BytecodeClosure* closure) { _closure = closure; }

  static void             trace(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st = tty);

  static void             trace(const methodHandle& method, address bcp, outputStream* st = tty);

};

// For each bytecode, a BytecodeClosure's trace() routine will be called.

class BytecodeClosure {

 public:

  virtual void trace(const methodHandle& method, address bcp, uintptr_t tos, uintptr_t tos2, outputStream* st) = 0;

  virtual void trace(const methodHandle& method, address bcp, outputStream* st) = 0;

};