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# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from slicc.ast.DeclAST import DeclAST
from slicc.ast.TypeAST import TypeAST
from slicc.symbols import Func, Type, Var
class InPortDeclAST(DeclAST):
def __init__(self, slicc, ident, msg_type, var_expr, pairs, statements):
super(InPortDeclAST, self).__init__(slicc, pairs)
self.ident = ident
self.msg_type = msg_type
self.var_expr = var_expr
self.statements = statements
self.queue_type = TypeAST(slicc, "InPort")
def __repr__(self):
return "[InPortDecl: %s]" % self.ident
def generate(self):
symtab = self.symtab
void_type = symtab.find("void", Type)
code = self.slicc.codeFormatter()
queue_type = self.var_expr.generate(code)
if not queue_type.isInPort:
self.error("The inport queue's type must have the 'inport' " + \
"attribute. Type '%s' does not have this attribute.",
queue_type)
type = self.queue_type.type
in_port = Var(self.symtab, self.ident, self.location, type, str(code),
self.pairs)
symtab.newSymbol(in_port)
symtab.pushFrame()
param_types = []
# Check for Event
type = symtab.find("Event", Type)
if type is None:
self.error("in_port decls require 'Event' enumeration defined")
param_types.append(type)
# Check for Address
type = symtab.find("Address", Type)
if type is None:
self.error("in_port decls require 'Address' type to be defined")
param_types.append(type)
# Add the trigger method - FIXME, this is a bit dirty
pairs = { "external" : "yes" }
func = Func(self.symtab, "trigger", self.location, void_type,
param_types, [], "", pairs, None)
symtab.newSymbol(func)
param_types = []
# Check for Event2
type = symtab.find("Event", Type)
if type is None:
self.error("in_port decls require 'Event' enumeration")
param_types.append(type)
# Check for Address2
type = symtab.find("Address", Type)
if type is None:
self.error("in_port decls require 'Address' type to be defined")
param_types.append(type)
# Add the doubleTrigger method - this hack supports tiggering
# two simulateous events
#
# The key is that the second transistion cannot fail because
# the first event cannot be undone therefore you must do some
# checks before calling double trigger to ensure that won't
# happen
func = Func(self.symtab, "doubleTrigger", self.location, void_type,
param_types, [], "", pairs, None)
symtab.newSymbol(func)
# Add the continueProcessing method - this hack supports
# messages that don't trigger events
func = Func(self.symtab, "continueProcessing", self.location,
void_type, [], [], "", pairs, None)
symtab.newSymbol(func)
if self.statements is not None:
rcode = self.slicc.codeFormatter()
rcode.indent()
rcode.indent()
self.statements.generate(rcode, None)
in_port["c_code_in_port"] = str(rcode)
symtab.popFrame()
# Add port to state machine
machine = symtab.state_machine
if machine is None:
self.error("InPort declaration not part of a machine.")
machine.addInPort(in_port)
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