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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.ExprAST import ExprAST
from slicc.symbols import Type
class InfixOperatorExprAST(ExprAST):
def __init__(self, slicc, left, op, right):
super(InfixOperatorExprAST, self).__init__(slicc)
self.left = left
self.op = op
self.right = right
def __repr__(self):
return "[InfixExpr: %r %s %r]" % (self.left, self.op, self.right)
def generate(self, code):
lcode = self.slicc.codeFormatter()
rcode = self.slicc.codeFormatter()
ltype = self.left.generate(lcode)
rtype = self.right.generate(rcode)
# Figure out what the input and output types should be
if self.op in ("==", "!="):
output = "bool"
if (ltype != rtype):
self.error("Type mismatch: left and right operands of " +
"operator '%s' must be the same type. " +
"left: '%s', right: '%s'",
self.op, ltype, rtype)
else:
if self.op in ("&&", "||"):
# boolean inputs and output
inputs = "bool"
output = "bool"
elif self.op in ("==", "!=", ">=", "<=", ">", "<"):
# Integer inputs, boolean output
inputs = "int"
output = "bool"
else:
# integer inputs and output
inputs = "int"
output = "int"
inputs_type = self.symtab.find(inputs, Type)
if inputs_type != ltype:
self.left.error("Type mismatch: left operand of operator " +
"'%s' expects type '%s', actual was '%s'",
self.op, inputs, ltype)
if inputs_type != rtype:
self.right.error("Type mismatch: right operand of operator " +
"'%s' expects type '%s', actual was '%s'",
self.op, inputs, rtype)
# All is well
fix = code.nofix()
code("($lcode ${{self.op}} $rcode)")
code.fix(fix)
return self.symtab.find(output, Type)
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