1 files changed, 73 insertions, 0 deletions
diff --git a/src/mem/slicc/ast/PeekStatementAST.py b/src/mem/slicc/ast/PeekStatementAST.py
new file mode 100644
index 000000000..5186bf0d5
--- /dev/null
+++ b/src/mem/slicc/ast/PeekStatementAST.py
@@ -0,0 +1,73 @@
+# 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.StatementAST import StatementAST
+from slicc.symbols import Var
+
+class PeekStatementAST(StatementAST):
+    def __init__(self, slicc, queue_name, type_ast, statements, method):
+        super(PeekStatementAST, self).__init__(slicc)
+
+        self.queue_name = queue_name
+        self.type_ast = type_ast
+        self.statements = statements
+        self.method = method
+
+    def __repr__(self):
+        return "[PeekStatementAST: %r queue_name: %r type: %r %r]" % \
+               (self.method, self.queue_name, self.type_ast, self.statements)
+
+    def generate(self, code, return_type):
+        self.symtab.pushFrame()
+
+        msg_type = self.type_ast.type
+
+        # Add new local var to symbol table
+        var = Var(self.symtab, "in_msg", self.location, msg_type, "(*in_msg_ptr)",
+                  self.pairs)
+        self.symtab.newSymbol(var)
+
+        # Check the queue type
+        self.queue_name.assertType("InPort")
+
+        # Declare the new "in_msg_ptr" variable
+        mtid = msg_type.ident
+        qcode = self.queue_name.var.code
+        code('''
+{
+    const $mtid* in_msg_ptr;
+    in_msg_ptr = dynamic_cast<const $mtid *>(($qcode).${{self.method}}());
+    assert(in_msg_ptr != NULL);
+''')
+
+        # The other statements
+        self.statements.generate(code, return_type)
+        self.symtab.popFrame()
+        code("}")
+
+    def findResources(self, resources):
+        self.statements.findResources(resources)