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diff --git a/src/mem/slicc/ast/IsValidPtrExprAST.py b/src/mem/slicc/ast/IsValidPtrExprAST.py
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+#
+# Copyright (c) 2011 Mark D. Hill and David A. Wood
+# 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 IsValidPtrExprAST(ExprAST):
+ def __init__(self, slicc, variable, flag):
+ super(IsValidPtrExprAST, self).__init__(slicc)
+ self.variable = variable
+ self.flag = flag
+
+ def __repr__(self):
+ return "[IsValidPtrExprAST: %r]" % self.variable
+
+ def generate(self, code):
+ # Make sure the variable is valid
+ fix = code.nofix()
+ code("(")
+ var_type, var_code = self.variable.inline(True);
+ var_code_str = str(var_code).replace('*','')
+ if self.flag:
+ code("${var_code_str} != NULL)")
+ else:
+ code("${var_code_str} == NULL)")
+ code.fix(fix)
+ type = self.symtab.find("bool", Type)
+ return type