src/mem/slicc/symbols/Transition.py

   1 # Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
   2 # Copyright (c) 2009 The Hewlett-Packard Development Company
   3 # All rights reserved.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
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   8 # notice, this list of conditions and the following disclaimer;
   9 # redistributions in binary form must reproduce the above copyright
  10 # notice, this list of conditions and the following disclaimer in the
  11 # documentation and/or other materials provided with the distribution;
  12 # neither the name of the copyright holders nor the names of its
  13 # contributors may be used to endorse or promote products derived from
  14 # this software without specific prior written permission.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  19 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  26 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27
  28 from slicc.symbols.Symbol import Symbol
  29
  30 class Transition(Symbol):
  31     def __init__(self, table, machine, state, event, nextState, actions,
  32                  location, pairs):
  33         ident = "%s|%s" % (state, event)
  34         super(Transition, self).__init__(table, ident, location, pairs)
  35
  36         self.state = machine.states[state]
  37         self.event = machine.events[event]
  38         self.nextState = machine.states[nextState]
  39         self.actions = [ machine.actions[a] for a in actions ]
  40         self.resources = {}
  41
  42         for action in self.actions:
  43             for var,value in action.resources.iteritems():
  44                 if var.type.ident != "DNUCAStopTable":
  45                     num = int(value)
  46                     if var in self.resources:
  47                         num += int(value)
  48                     self.resources[var] = str(num)
  49                 else:
  50                     self.resources[var] = value
  51
  52     def __repr__(self):
  53       return "[Transition: (%r, %r) -> %r, %r]" % \
  54              (self.state, self.event, self.nextState, self.actions)
  55
  56     def getActionShorthands(self):
  57         assert self.actions
  58
  59         return ''.join(a.short for a in self.actions)
  60
  61 __all__ = [ "Transition" ]