hotspot/src/share/vm/ci/ciMethodBlocks.hpp
author duke
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/*
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 * Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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class ciBlock;
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typedef short ciBlockIndex;
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class ciMethodBlocks : public ResourceObj {
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private:
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  ciMethod *_method;
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  Arena *_arena;
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  GrowableArray<ciBlock *>  *_blocks;
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  ciBlock  **_bci_to_block;
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  int _num_blocks;
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  int _code_size;
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  void do_analysis();
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public:
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  ciMethodBlocks(Arena *arena, ciMethod *meth);
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  ciBlock *block_containing(int bci);
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  ciBlock *block(int index)  { return _blocks->at(index); }
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  ciBlock *make_block_at(int bci);
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  ciBlock *split_block_at(int bci);
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  bool is_block_start(int bci);
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  int num_blocks()  { return _num_blocks;}
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  void clear_processed();
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#ifndef PRODUCT
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  void dump();
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#endif
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};
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class ciBlock : public ResourceObj {
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private:
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  int _idx;
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  int _start_bci;
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  int _limit_bci;
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  int _control_bci;
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  uint _flags;
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  int _ex_start_bci;
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  int _ex_limit_bci;
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#ifndef PRODUCT
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  ciMethod *_method;
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#endif
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  enum {
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    Processed   = (1 << 0),
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    Handler     = (1 << 1),
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    MayThrow    = (1 << 2),
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    DoesJsr     = (1 << 3),
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    DoesRet     = (1 << 4),
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    RetTarget   = (1 << 5),
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    HasHandler  = (1 << 6)
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  };
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public:
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  enum {
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    fall_through_bci = -1
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  };
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  ciBlock(ciMethod *method, int index, ciMethodBlocks *mb, int start_bci);
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  int start_bci() const         { return _start_bci; }
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  int limit_bci() const         { return _limit_bci; }
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  int control_bci() const       { return _control_bci; }
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  int index() const             { return _idx; }
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  void set_start_bci(int bci)   { _start_bci = bci; }
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  void set_limit_bci(int bci)   { _limit_bci = bci; }
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  void set_control_bci(int bci) { _control_bci = bci;}
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  void set_exception_range(int start_bci, int limit_bci);
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  int ex_start_bci() const      { return _ex_start_bci; }
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  int ex_limit_bci() const      { return _ex_limit_bci; }
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  bool contains(int bci) const { return start_bci() <= bci && bci < limit_bci(); }
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  // flag handling
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  bool  processed() const           { return (_flags & Processed) != 0; }
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  bool  is_handler() const          { return (_flags & Handler) != 0; }
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  bool  may_throw() const           { return (_flags & MayThrow) != 0; }
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  bool  does_jsr() const            { return (_flags & DoesJsr) != 0; }
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  bool  does_ret() const            { return (_flags & DoesRet) != 0; }
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  bool  has_handler() const         { return (_flags & HasHandler) != 0; }
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  bool  is_ret_target() const       { return (_flags & RetTarget) != 0; }
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  void  set_processed()             { _flags |= Processed; }
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  void  clear_processed()           { _flags &= ~Processed; }
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  void  set_handler()               { _flags |= Handler; }
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  void  set_may_throw()             { _flags |= MayThrow; }
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  void  set_does_jsr()              { _flags |= DoesJsr; }
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  void  clear_does_jsr()            { _flags &= ~DoesJsr; }
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  void  set_does_ret()              { _flags |= DoesRet; }
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  void  clear_does_ret()            { _flags |= DoesRet; }
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  void  set_is_ret_target()         { _flags |= RetTarget; }
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  void  set_has_handler()           { _flags |= HasHandler; }
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#ifndef PRODUCT
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  ciMethod *method() const          { return _method; }
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  void dump();
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  void print_on(outputStream* st) const  PRODUCT_RETURN;
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#endif
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};