src/mem/slicc/symbols/Transition.py

# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# All rights reserved.
#
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from slicc.symbols.Symbol import Symbol
from slicc.symbols.State import WildcardState


class Transition(Symbol):
    def __init__(
        self,
        table,
        machine,
        state,
        event,
        nextState,
        actions,
        request_types,
        location,
    ):
        ident = "%s|%s" % (state, event)
        super().__init__(table, ident, location)

        self.state = machine.states[state]
        self.event = machine.events[event]
        if nextState == "*":
            # check to make sure there is a getNextState function declared
            found = False
            for func in machine.functions:
                if func.c_ident == "getNextState_Addr":
                    found = True
                    break
            if not found:
                fatal(
                    "Machine uses a wildcard transition without getNextState defined"
                )
            self.nextState = WildcardState(machine.symtab, "*", location)
        else:
            self.nextState = machine.states[nextState]
        self.actions = [machine.actions[a] for a in actions]
        self.request_types = [machine.request_types[s] for s in request_types]
        self.resources = {}

        for action in self.actions:
            for var, value in action.resources.items():
                num = int(value)
                if var in self.resources:
                    num += int(value)
                self.resources[var] = str(num)

    def __repr__(self):
        return "[Transition: (%r, %r) -> %r, %r]" % (
            self.state,
            self.event,
            self.nextState,
            self.actions,
        )

    def getActionShorthands(self):
        assert self.actions

        return "".join(a.short for a in self.actions)


__all__ = ["Transition"]