src/mem/slicc/ast/EnumExprAST.py

   1 # Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
   2 # Copyright (c) 2009 The Hewlett-Packard Development Company
   3 # All rights reserved.
   4 #
   5 # Redistribution and use in source and binary forms, with or without
   6 # modification, are permitted provided that the following conditions are
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   8 # notice, this list of conditions and the following disclaimer;
   9 # redistributions in binary form must reproduce the above copyright
  10 # notice, this list of conditions and the following disclaimer in the
  11 # documentation and/or other materials provided with the distribution;
  12 # neither the name of the copyright holders nor the names of its
  13 # contributors may be used to endorse or promote products derived from
  14 # this software without specific prior written permission.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  19 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  23 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  26 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27
  28 from slicc.ast.ExprAST import ExprAST
  29
  30 class EnumExprAST(ExprAST):
  31     def __init__(self, slicc, type_ast, value):
  32         super(EnumExprAST, self).__init__(slicc)
  33
  34         assert type_ast
  35         assert value
  36
  37         self.type_ast = type_ast
  38         self.value = value
  39
  40     def __repr__(self):
  41         return "[EnumExpr: %s:%s]" % (self.type_ast, self.value)
  42
  43     def generate(self, code):
  44         fix = code.nofix()
  45         code('${{self.type_ast.type.c_ident}}_${{self.value}}')
  46         code.fix(fix)
  47
  48         # Make sure the enumeration value exists
  49         if self.value not in self.type_ast.type.enums:
  50             self.error("Type '%s' does not have enumeration '%s'",
  51                        self.type_ast, self.value)
  52
  53         return self.type_ast.type