hotspot/src/share/vm/ci/ciExceptionHandler.hpp
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Fri, 02 Jun 2017 13:48:01 +0200
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8177044: Remove _scan_top from HeapRegion Summary: Remove the _scan_top member from HeapRegion using a per-gc pre-calculated table of scan limits that also subsumes other checks. Reviewed-by: sangheki, kbarrett, ehelin
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/*
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 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_CI_CIEXCEPTIONHANDLER_HPP
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#define SHARE_VM_CI_CIEXCEPTIONHANDLER_HPP
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#include "ci/ciClassList.hpp"
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#include "ci/ciInstanceKlass.hpp"
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// ciExceptionHandler
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//
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// This class represents an exception handler for a method.
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class ciExceptionHandler : public ResourceObj {
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private:
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  friend class ciMethod;
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  // The loader to be used for resolving the exception
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  // klass.
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  ciInstanceKlass* _loading_klass;
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  // Handler data.
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  int _start;
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  int _limit;
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  int _handler_bci;
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  int _catch_klass_index;
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  // The exception klass that this handler catches.
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  ciInstanceKlass* _catch_klass;
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public:
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  ciExceptionHandler(ciInstanceKlass* loading_klass,
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                     int start, int limit,
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                     int handler_bci, int klass_index) {
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    _loading_klass = loading_klass;
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    _start  = start;
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    _limit  = limit;
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    _handler_bci = handler_bci;
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    _catch_klass_index = klass_index;
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    _catch_klass = NULL;
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  }
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  int       start()             { return _start; }
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  int       limit()             { return _limit; }
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  int       handler_bci()       { return _handler_bci; }
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  int       catch_klass_index() { return _catch_klass_index; }
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  // Get the exception klass that this handler catches.
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  ciInstanceKlass* catch_klass();
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  bool      is_catch_all() { return catch_klass_index() == 0; }
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  bool      is_in_range(int bci) {
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    return start() <= bci && bci < limit();
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  }
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  bool      catches(ciInstanceKlass *exc) {
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    return is_catch_all() || exc->is_subtype_of(catch_klass());
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  }
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  bool      is_rethrow() { return handler_bci() == -1; }
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  void      print();
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};
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#endif // SHARE_VM_CI_CIEXCEPTIONHANDLER_HPP