1 /*
   2  * Copyright (c) 1999, 2005, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // ciExceptionHandler
  26 //
  27 // This class represents an exception handler for a method.
  28 class ciExceptionHandler : public ResourceObj {
  29 private:
  30   friend class ciMethod;
  31 
  32   // The loader to be used for resolving the exception
  33   // klass.
  34   ciInstanceKlass* _loading_klass;
  35 
  36   // Handler data.
  37   int _start;
  38   int _limit;
  39   int _handler_bci;
  40   int _catch_klass_index;
  41 
  42   // The exception klass that this handler catches.
  43   ciInstanceKlass* _catch_klass;
  44 
  45 public:
  46   ciExceptionHandler(ciInstanceKlass* loading_klass,
  47                      int start, int limit,
  48                      int handler_bci, int klass_index) {
  49     _loading_klass = loading_klass;
  50     _start  = start;
  51     _limit  = limit;
  52     _handler_bci = handler_bci;
  53     _catch_klass_index = klass_index;
  54     _catch_klass = NULL;
  55   }
  56 
  57   int       start()             { return _start; }
  58   int       limit()             { return _limit; }
  59   int       handler_bci()       { return _handler_bci; }
  60   int       catch_klass_index() { return _catch_klass_index; }
  61 
  62   // Get the exception klass that this handler catches.
  63   ciInstanceKlass* catch_klass();
  64 
  65   bool      is_catch_all() { return catch_klass_index() == 0; }
  66   bool      is_in_range(int bci) {
  67     return start() <= bci && bci < limit();
  68   }
  69   bool      catches(ciInstanceKlass *exc) {
  70     return is_catch_all() || exc->is_subtype_of(catch_klass());
  71   }
  72   bool      is_rethrow() { return handler_bci() == -1; }
  73 
  74   void      print();
  75 };