/*

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

 * Copyright 2008, 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.

 *

 */

#ifndef SHARE_VM_SHARK_SHARKINVARIANTS_HPP

#define SHARE_VM_SHARK_SHARKINVARIANTS_HPP

#include "ci/ciEnv.hpp"

#include "ci/ciInstanceKlass.hpp"

#include "ci/ciMethod.hpp"

#include "ci/ciTypeFlow.hpp"

#include "code/debugInfoRec.hpp"

#include "code/dependencies.hpp"

#include "memory/allocation.hpp"

#include "shark/llvmHeaders.hpp"

#include "shark/sharkBuilder.hpp"

// Base classes used to track various values through the compilation.

// SharkCompileInvariants is used to track values which remain the

// same for the top-level method and any inlined methods it may have

// (ie for the whole compilation).  SharkTargetInvariants is used to

// track values which differ between methods.

class SharkCompileInvariants : public ResourceObj {

 protected:

  SharkCompileInvariants(ciEnv* env, SharkBuilder* builder)

    : _env(env),

      _builder(builder),

      _thread(NULL) {}

  SharkCompileInvariants(const SharkCompileInvariants* parent)

    : _env(parent->_env),

      _builder(parent->_builder),

      _thread(parent->_thread) {}

 private:

  ciEnv*        _env;

  SharkBuilder* _builder;

  llvm::Value*  _thread;

  // Top-level broker for HotSpot's Compiler Interface.

  //

  // Its main purpose is to allow the various CI classes to access

  // oops in the VM without having to worry about safepointing.  In

  // addition to this it acts as a holder for various recorders and

  // memory allocators.

  //

  // Accessing this directly is kind of ugly, so it's private.  Add

  // new accessors below if you need something from it.

 protected:

  ciEnv* env() const {

    assert(_env != NULL, "env not available");

    return _env;

  }

  // The SharkBuilder that is used to build LLVM IR.

 protected:

  SharkBuilder* builder() const {

    return _builder;

  }

  // Pointer to this thread's JavaThread object.  This is not

  // available until a short way into SharkFunction creation

  // so a setter is required.  Assertions are used to enforce

  // invariance.

 protected:

  llvm::Value* thread() const {

    assert(_thread != NULL, "thread not available");

    return _thread;

  }

  void set_thread(llvm::Value* thread) {

    assert(_thread == NULL, "thread already set");

    _thread = thread;

  }

  // Objects that handle various aspects of the compilation.

 protected:

  DebugInformationRecorder* debug_info() const {

    return env()->debug_info();

  }

  SharkCodeBuffer* code_buffer() const {

    return builder()->code_buffer();

  }

 public:

  Dependencies* dependencies() const {

    return env()->dependencies();

  }

  // Commonly used classes

 protected:

  ciInstanceKlass* java_lang_Object_klass() const {

    return env()->Object_klass();

  }

  ciInstanceKlass* java_lang_Throwable_klass() const {

    return env()->Throwable_klass();

  }

};

class SharkTargetInvariants : public SharkCompileInvariants {

 protected:

  SharkTargetInvariants(ciEnv* env, SharkBuilder* builder, ciTypeFlow* flow)

    : SharkCompileInvariants(env, builder),

      _target(flow->method()),

      _flow(flow),

      _max_monitors(count_monitors()) {}

  SharkTargetInvariants(const SharkCompileInvariants* parent, ciMethod* target)

    : SharkCompileInvariants(parent),

      _target(target),

      _flow(NULL),

      _max_monitors(count_monitors()) {}

  SharkTargetInvariants(const SharkTargetInvariants* parent)

    : SharkCompileInvariants(parent),

      _target(parent->_target),

      _flow(parent->_flow),

      _max_monitors(parent->_max_monitors) {}

 private:

  int count_monitors();

 private:

  ciMethod*   _target;

  ciTypeFlow* _flow;

  int         _max_monitors;

  // The method being compiled.

 protected:

  ciMethod* target() const {

    return _target;

  }

  // Typeflow analysis of the method being compiled.

 protected:

  ciTypeFlow* flow() const {

    assert(_flow != NULL, "typeflow not available");

    return _flow;

  }

  // Properties of the method.

 protected:

  int max_locals() const {

    return target()->max_locals();

  }

  int max_stack() const {

    return target()->max_stack();

  }

  int max_monitors() const {

    return _max_monitors;

  }

  int arg_size() const {

    return target()->arg_size();

  }

  bool is_static() const {

    return target()->is_static();

  }

  bool is_synchronized() const {

    return target()->is_synchronized();

  }

};

#endif // SHARE_VM_SHARK_SHARKINVARIANTS_HPP