InPortDeclAST.py revision 6999
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 7# met: redistributions of source code must retain the above copyright 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 18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 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 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28from slicc.ast.DeclAST import DeclAST 29from slicc.ast.TypeAST import TypeAST 30from slicc.symbols import Func, Type, Var 31 32class InPortDeclAST(DeclAST): 33 def __init__(self, slicc, ident, msg_type, var_expr, pairs, statements): 34 super(InPortDeclAST, self).__init__(slicc, pairs) 35 36 self.ident = ident 37 self.msg_type = msg_type 38 self.var_expr = var_expr 39 self.statements = statements 40 self.queue_type = TypeAST(slicc, "InPort") 41 42 def __repr__(self): 43 return "[InPortDecl: %s]" % self.ident 44 45 def generate(self): 46 symtab = self.symtab 47 void_type = symtab.find("void", Type) 48 49 code = self.slicc.codeFormatter() 50 queue_type = self.var_expr.generate(code) 51 if not queue_type.isInPort: 52 self.error("The inport queue's type must have the 'inport' " + \ 53 "attribute. Type '%s' does not have this attribute.", 54 queue_type) 55 56 type = self.queue_type.type 57 in_port = Var(self.symtab, self.ident, self.location, type, str(code), 58 self.pairs) 59 symtab.newSymbol(in_port) 60 61 symtab.pushFrame() 62 param_types = [] 63 64 # Check for Event 65 type = symtab.find("Event", Type) 66 if type is None: 67 self.error("in_port decls require 'Event' enumeration defined") 68 param_types.append(type) 69 70 # Check for Address 71 type = symtab.find("Address", Type) 72 if type is None: 73 self.error("in_port decls require 'Address' type to be defined") 74 75 param_types.append(type) 76 77 # Add the trigger method - FIXME, this is a bit dirty 78 pairs = { "external" : "yes" } 79 func = Func(self.symtab, "trigger", self.location, void_type, 80 param_types, [], "", pairs, None) 81 symtab.newSymbol(func) 82 83 param_types = [] 84 # Check for Event2 85 type = symtab.find("Event", Type) 86 if type is None: 87 self.error("in_port decls require 'Event' enumeration") 88 89 param_types.append(type) 90 91 # Check for Address2 92 type = symtab.find("Address", Type) 93 if type is None: 94 self.error("in_port decls require 'Address' type to be defined") 95 96 param_types.append(type) 97 98 # Add the doubleTrigger method - this hack supports tiggering 99 # two simulateous events 100 # 101 # The key is that the second transistion cannot fail because 102 # the first event cannot be undone therefore you must do some 103 # checks before calling double trigger to ensure that won't 104 # happen 105 func = Func(self.symtab, "doubleTrigger", self.location, void_type, 106 param_types, [], "", pairs, None) 107 symtab.newSymbol(func) 108 109 # Add the continueProcessing method - this hack supports 110 # messages that don't trigger events 111 func = Func(self.symtab, "continueProcessing", self.location, 112 void_type, [], [], "", pairs, None) 113 symtab.newSymbol(func) 114 115 if self.statements is not None: 116 rcode = self.slicc.codeFormatter() 117 rcode.indent() 118 rcode.indent() 119 self.statements.generate(rcode, None) 120 in_port["c_code_in_port"] = str(rcode) 121 symtab.popFrame() 122 123 # Add port to state machine 124 machine = symtab.state_machine 125 if machine is None: 126 self.error("InPort declaration not part of a machine.") 127 128 machine.addInPort(in_port) 129