# 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
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from slicc.ast.StatementAST import StatementAST

class ReturnStatementAST(StatementAST):
    def __init__(self, slicc, expr_ast):
        super(ReturnStatementAST, self).__init__(slicc)

        self.expr_ast = expr_ast

    def __repr__(self):
        return "[ReturnStatementAST: %r]" % self.expr_ast

    def generate(self, code, return_type):
        actual_type, ecode = self.expr_ast.inline(True)
        code('return $ecode;')

        # Is return valid here?
        if return_type is None:
            error("Invalid 'return' statement")

        # The return type must match
        if return_type != actual_type:
            self.expr_ast.error("Return type miss-match, expected return " +
                                "type is '%s', actual is '%s'",
                                return_type, actual_type)

    def findResources(self, resources):
        self.expr_ast.findResources(resources)