1 files changed, 53 insertions, 0 deletions
diff --git a/src/mem/slicc/ast/IsValidPtrExprAST.py b/src/mem/slicc/ast/IsValidPtrExprAST.py
new file mode 100644
index 000000000..850f45e96
--- /dev/null
+++ b/src/mem/slicc/ast/IsValidPtrExprAST.py
@@ -0,0 +1,53 @@
+#
+# 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