# 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
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from slicc.ast.StatementAST import StatementAST
from slicc.symbols import Var

class EnqueueStatementAST(StatementAST):
    def __init__(self, slicc, queue_name, type_ast, lexpr, statements):
        super(EnqueueStatementAST, self).__init__(slicc)

        self.queue_name = queue_name
        self.type_ast = type_ast
        self.latexpr = lexpr
        self.statements = statements

    def __repr__(self):
        return "[EnqueueStatementAst: %s %s %s]" % \
               (self.queue_name, self.type_ast.ident, self.statements)

    def generate(self, code, return_type):
        code("{")
        code.indent()
        self.symtab.pushFrame()

        msg_type = self.type_ast.type

        # Add new local var to symbol table
        v = Var(self.symtab, "out_msg", self.location, msg_type, "*out_msg",
                self.pairs)
        self.symtab.newSymbol(v)

        # Declare message
        code("${{msg_type.ident}} *out_msg = "\
             "new ${{msg_type.ident}}(clockEdge());")

        # The other statements
        t = self.statements.generate(code, None)
        self.queue_name.assertType("OutPort")

        if self.latexpr != None:
            ret_type, rcode = self.latexpr.inline(True)
            code("(${{self.queue_name.var.code}}).enqueue(" \
                 "out_msg, Cycles($rcode));")
        else:
            code("(${{self.queue_name.var.code}}).enqueue(out_msg);")

        # End scope
        self.symtab.popFrame()
        code.dedent()
        code("}")

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