17839Snilay@cs.wisc.edu#
27839Snilay@cs.wisc.edu# Copyright (c) 2011 Mark D. Hill and David A. Wood
37839Snilay@cs.wisc.edu# All rights reserved.
47839Snilay@cs.wisc.edu#
57839Snilay@cs.wisc.edu# Redistribution and use in source and binary forms, with or without
67839Snilay@cs.wisc.edu# modification, are permitted provided that the following conditions are
77839Snilay@cs.wisc.edu# met: redistributions of source code must retain the above copyright
87839Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer;
97839Snilay@cs.wisc.edu# redistributions in binary form must reproduce the above copyright
107839Snilay@cs.wisc.edu# notice, this list of conditions and the following disclaimer in the
117839Snilay@cs.wisc.edu# documentation and/or other materials provided with the distribution;
127839Snilay@cs.wisc.edu# neither the name of the copyright holders nor the names of its
137839Snilay@cs.wisc.edu# contributors may be used to endorse or promote products derived from
147839Snilay@cs.wisc.edu# this software without specific prior written permission.
157839Snilay@cs.wisc.edu#
167839Snilay@cs.wisc.edu# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
177839Snilay@cs.wisc.edu# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
187839Snilay@cs.wisc.edu# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
197839Snilay@cs.wisc.edu# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
207839Snilay@cs.wisc.edu# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
217839Snilay@cs.wisc.edu# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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257839Snilay@cs.wisc.edu# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
267839Snilay@cs.wisc.edu# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
277839Snilay@cs.wisc.edu#
287839Snilay@cs.wisc.edu
297839Snilay@cs.wisc.edufrom slicc.ast.ExprAST import ExprAST
307839Snilay@cs.wisc.edufrom slicc.symbols import Type
317839Snilay@cs.wisc.edu
327839Snilay@cs.wisc.educlass IsValidPtrExprAST(ExprAST):
337839Snilay@cs.wisc.edu    def __init__(self, slicc, variable, flag):
347839Snilay@cs.wisc.edu        super(IsValidPtrExprAST, self).__init__(slicc)
357839Snilay@cs.wisc.edu        self.variable = variable
367839Snilay@cs.wisc.edu        self.flag = flag
377839Snilay@cs.wisc.edu
387839Snilay@cs.wisc.edu    def __repr__(self):
397839Snilay@cs.wisc.edu        return "[IsValidPtrExprAST: %r]" % self.variable
407839Snilay@cs.wisc.edu
417839Snilay@cs.wisc.edu    def generate(self, code):
427839Snilay@cs.wisc.edu        # Make sure the variable is valid
437839Snilay@cs.wisc.edu        fix = code.nofix()
447839Snilay@cs.wisc.edu        code("(")
457839Snilay@cs.wisc.edu        var_type, var_code = self.variable.inline(True);
467839Snilay@cs.wisc.edu        if self.flag:
478192SLisa.Hsu@amd.com            code("${var_code} != NULL)")
487839Snilay@cs.wisc.edu        else:
498192SLisa.Hsu@amd.com            code("${var_code} == NULL)")
507839Snilay@cs.wisc.edu        code.fix(fix)
517839Snilay@cs.wisc.edu        type = self.symtab.find("bool", Type)
527839Snilay@cs.wisc.edu        return type
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