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path: root/src/mem/slicc/ast/InfixOperatorExprAST.py
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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:
            expected_types = []
            output = None

            if self.op in ("&&", "||"):
                # boolean inputs and output
                expected_types = [("bool", "bool", "bool")]
            elif self.op in ("<<", ">>"):
                expected_types = [("int", "int", "int"),
                                  ("Cycles", "int", "Cycles")]
            elif self.op in ("+", "-", "*", "/"):
                expected_types = [("int", "int", "int"),
                                  ("Time", "Time", "Time"),
                                  ("Cycles", "Cycles", "Cycles"),
                                  ("Cycles", "int", "Cycles"),
                                  ("int", "Cycles", "Cycles")]
            else:
                self.error("No operator matched with {0}!" .format(self.op))

            for expected_type in expected_types:
                left_input_type = self.symtab.find(expected_type[0], Type)
                right_input_type = self.symtab.find(expected_type[1], Type)

                if (left_input_type == ltype) and (right_input_type == rtype):
                    output = expected_type[2]

            if output == None:
                self.error("Type mismatch: operands ({0}, {1}) for operator " \
                           "'{2}' failed to match with the expected types" .
                           format(ltype, rtype, self.op))

        # All is well
        fix = code.nofix()
        code("($lcode ${{self.op}} $rcode)")
        code.fix(fix)
        return self.symtab.find(output, Type)