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,
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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 from slicc.symbols.State import WildcardState
  30
  31 class Transition(Symbol):
  32     def __init__(self, table, machine, state, event, nextState, actions,
  33                  request_types, location):
  34         ident = "%s|%s" % (state, event)
  35         super(Transition, self).__init__(table, ident, location)
  36
  37         self.state = machine.states[state]
  38         self.event = machine.events[event]
  39         if nextState == '*':
  40             # check to make sure there is a getNextState function declared
  41             found = False
  42             for func in machine.functions:
  43                 if func.c_ident == 'getNextState':
  44                     found = True
  45                     break
  46             if found == False:
  47                 fatal("Machine uses a wildcard transition without getNextState defined")
  48             self.nextState = WildcardState(machine.symtab,
  49                                            '*', location)
  50         else:
  51             self.nextState = machine.states[nextState]
  52         self.actions = [ machine.actions[a] for a in actions ]
  53         self.request_types = [ machine.request_types[s] for s in request_types ]
  54         self.resources = {}
  55
  56         for action in self.actions:
  57             for var,value in action.resources.iteritems():
  58                 num = int(value)
  59                 if var in self.resources:
  60                     num += int(value)
  61                 self.resources[var] = str(num)
  62
  63     def __repr__(self):
  64       return "[Transition: (%r, %r) -> %r, %r]" % \
  65              (self.state, self.event, self.nextState, self.actions)
  66
  67     def getActionShorthands(self):
  68         assert self.actions
  69
  70         return ''.join(a.short for a in self.actions)
  71
  72 __all__ = [ "Transition" ]