OperatorExprAST.py revision 6657
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 m5.util import code_formatter 29 30from slicc.ast.ExprAST import ExprAST 31from slicc.symbols import Type 32 33class InfixOperatorExprAST(ExprAST): 34 def __init__(self, slicc, left, op, right): 35 super(InfixOperatorExprAST, self).__init__(slicc) 36 37 self.left = left 38 self.op = op 39 self.right = right 40 41 def __repr__(self): 42 return "[InfixExpr: %r %s %r]" % (self.left, self.op, self.right) 43 44 def generate(self, code): 45 lcode = code_formatter() 46 rcode = code_formatter() 47 48 ltype = self.left.generate(lcode) 49 rtype = self.right.generate(rcode) 50 51 # Figure out what the input and output types should be 52 if self.op in ("==", "!="): 53 output = "bool" 54 if (ltype != rtype): 55 self.error("Type mismatch: left and right operands of " + 56 "operator '%s' must be the same type. " + 57 "left: '%s', right: '%s'", 58 self.op, ltype, rtype) 59 else: 60 if self.op in ("&&", "||"): 61 # boolean inputs and output 62 inputs = "bool" 63 output = "bool" 64 elif self.op in ("==", "!=", ">=", "<=", ">", "<"): 65 # Integer inputs, boolean output 66 inputs = "int" 67 output = "bool" 68 else: 69 # integer inputs and output 70 inputs = "int" 71 output = "int" 72 73 inputs_type = self.symtab.find(inputs, Type) 74 75 if inputs_type != ltype: 76 self.left.error("Type mismatch: left operand of operator " + 77 "'%s' expects type '%s', actual was '%s'", 78 self.op, inputs, ltype) 79 80 if inputs_type != rtype: 81 self.right.error("Type mismatch: right operand of operator " + 82 "'%s' expects type '%s', actual was '%s'", 83 self.op, inputs, rtype) 84 85 # All is well 86 fix = code.nofix() 87 code("($lcode ${{self.op}} $rcode)") 88 code.fix(fix) 89 return self.symtab.find(output, Type) 90