# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
# Copyright (c) 2009 The Hewlett-Packard Development Company
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
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# this software without specific prior written permission.
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from slicc.ast.StatementAST import StatementAST

class CopyHeadStatementAST(StatementAST):
    def __init__(self, slicc, in_queue, out_queue, pairs):
        super(CopyHeadStatementAST, self).__init__(slicc, pairs)

        self.in_queue = in_queue
        self.out_queue_ptr = out_queue

    def __repr__(self):
        return "[CopyHeadStatementAst: %r %r]" % (self.in_queue,
                                                  self.out_queue)

    def generate(self, code, return_type):
        self.in_queue.assertType("InPort")
        self.out_queue.assertType("OutPort")

        out_code = self.out_queue.var.code
        in_code = self.in_queue.var.code
        latency = self.get("latency", "COPY_HEAD_LATENCY")
        code("$out_code.enqueue($in_code.getMsgPtrCopy(), $latency);")

    def findResources(self, resources):
        var = self.out_queue.var
        resources[var] = str(int(resources.get(var, "0")) + 1)