src/mem/slicc/ast/AssignStatementAST.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
   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
  28 from slicc.ast.StatementAST import StatementAST
  29
  30 class AssignStatementAST(StatementAST):
  31     def __init__(self, slicc, lvalue, rvalue):
  32         super(AssignStatementAST, self).__init__(slicc)
  33         self.lvalue = lvalue
  34         self.rvalue = rvalue
  35
  36     def __repr__(self):
  37         return "[AssignStatementAST: %r := %r]" % (self.lvalue, self.rvalue)
  38
  39     def generate(self, code, return_type):
  40         lcode = self.slicc.codeFormatter()
  41         rcode = self.slicc.codeFormatter()
  42
  43         ltype = self.lvalue.generate(lcode)
  44         rtype = self.rvalue.generate(rcode)
  45
  46         code("$lcode = $rcode;")
  47
  48         if not (ltype == rtype or (ltype.isInterface and ltype['interface'] == rtype.ident)):
  49             # FIXME - beckmann
  50             # the following if statement is a hack to allow NetDest objects to
  51             # be assigned to Sets this allows for the previous Message
  52             # Destination 'Set class' to migrate to the new Message Destination
  53             # 'NetDest class'
  54             if str(ltype) != "NetDest" and str(rtype) != "Set":
  55                 self.error("Assignment type mismatch '%s' and '%s'",
  56                            ltype, rtype)