# 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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# this software without specific prior written permission.
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from m5.util import code_formatter

from slicc.ast.ExprAST import ExprAST

class MemberExprAST(ExprAST):
    def __init__(self, slicc, expr_ast, field):
        super(MemberExprAST, self).__init__(slicc)

        self.expr_ast = expr_ast
        self.field = field

    def __repr__(self):
        return "[MemberExprAST: %r.%r]" % (self.expr_ast, self.field)

    def generate(self, code):
        return_type, gcode = self.expr_ast.inline(True)
        fix = code.nofix()
        code("($gcode).m_${{self.field}}")
        code.fix(fix)

        # Verify that this is a valid field name for this type
        if self.field not in return_type.data_members:
            error("Invalid object field: " +
                  "Type '%s' does not have data member %s" % \
                  (return_type, self.field))

        # Return the type of the field
        return return_type.data_members[self.field].type