/*

 * Copyright (c) 2006, 2010, 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_CI_CIMETHODBLOCKS_HPP

#define SHARE_VM_CI_CIMETHODBLOCKS_HPP

#include "ci/ciMethod.hpp"

#include "memory/resourceArea.hpp"

#include "utilities/growableArray.hpp"

class ciBlock;

typedef short ciBlockIndex;

class ciMethodBlocks : public ResourceObj {

private:

  ciMethod *_method;

  Arena *_arena;

  GrowableArray<ciBlock *>  *_blocks;

  ciBlock  **_bci_to_block;

  int _num_blocks;

  int _code_size;

  void do_analysis();

public:

  ciMethodBlocks(Arena *arena, ciMethod *meth);

  ciBlock *block_containing(int bci);

  ciBlock *block(int index)  { return _blocks->at(index); }

  ciBlock *make_block_at(int bci);

  ciBlock *split_block_at(int bci);

  bool is_block_start(int bci);

  int num_blocks()  { return _num_blocks;}

  void clear_processed();

  ciBlock *make_dummy_block(); // a block not associated with a bci

#ifndef PRODUCT

  void dump();

#endif

};

class ciBlock : public ResourceObj {

private:

  int _idx;

  int _start_bci;

  int _limit_bci;

  int _control_bci;

  uint _flags;

  int _ex_start_bci;

  int _ex_limit_bci;

#ifndef PRODUCT

  ciMethod *_method;

#endif

  enum {

    Processed   = (1 << 0),

    Handler     = (1 << 1),

    MayThrow    = (1 << 2),

    DoesJsr     = (1 << 3),

    DoesRet     = (1 << 4),

    RetTarget   = (1 << 5),

    HasHandler  = (1 << 6)

  };

public:

  enum {

    fall_through_bci = -1

  };

  ciBlock(ciMethod *method, int index, int start_bci);

  int start_bci() const         { return _start_bci; }

  int limit_bci() const         { return _limit_bci; }

  int control_bci() const       { return _control_bci; }

  int index() const             { return _idx; }

  void set_start_bci(int bci)   { _start_bci = bci; }

  void set_limit_bci(int bci)   { _limit_bci = bci; }

  void set_control_bci(int bci) { _control_bci = bci;}

  void set_exception_range(int start_bci, int limit_bci);

  int ex_start_bci() const      { return _ex_start_bci; }

  int ex_limit_bci() const      { return _ex_limit_bci; }

  bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); }

  // flag handling

  bool  processed() const           { return (_flags & Processed) != 0; }

  bool  is_handler() const          { return (_flags & Handler) != 0; }

  bool  may_throw() const           { return (_flags & MayThrow) != 0; }

  bool  does_jsr() const            { return (_flags & DoesJsr) != 0; }

  bool  does_ret() const            { return (_flags & DoesRet) != 0; }

  bool  has_handler() const         { return (_flags & HasHandler) != 0; }

  bool  is_ret_target() const       { return (_flags & RetTarget) != 0; }

  void  set_processed()             { _flags |= Processed; }

  void  clear_processed()           { _flags &= ~Processed; }

  void  set_handler()               { _flags |= Handler; }

  void  set_may_throw()             { _flags |= MayThrow; }

  void  set_does_jsr()              { _flags |= DoesJsr; }

  void  clear_does_jsr()            { _flags &= ~DoesJsr; }

  void  set_does_ret()              { _flags |= DoesRet; }

  void  clear_does_ret()            { _flags &= ~DoesRet; }

  void  set_is_ret_target()         { _flags |= RetTarget; }

  void  set_has_handler()           { _flags |= HasHandler; }

  void  clear_exception_handler()   { _flags &= ~Handler; _ex_start_bci = -1; _ex_limit_bci = -1; }

#ifndef PRODUCT

  ciMethod *method() const          { return _method; }

  void dump();

  void print_on(outputStream* st) const  PRODUCT_RETURN;

#endif

};

#endif // SHARE_VM_CI_CIMETHODBLOCKS_HPP