src/mem/slicc/ast/MemberExprAST.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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  22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  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 MemberExprAST(ExprAST):
  31     def __init__(self, slicc, expr_ast, field):
  32         super(MemberExprAST, self).__init__(slicc)
  33
  34         self.expr_ast = expr_ast
  35         self.field = field
  36
  37     def __repr__(self):
  38         return "[MemberExprAST: %r.%r]" % (self.expr_ast, self.field)
  39
  40     def generate(self, code):
  41         return_type, gcode = self.expr_ast.inline(True)
  42         fix = code.nofix()
  43
  44         if str(return_type) == "TBE" or ("interface" in return_type and return_type["interface"] == "AbstractCacheEntry"):
  45             code("(*$gcode).m_${{self.field}}")
  46         else:
  47             code("($gcode).m_${{self.field}}")
  48
  49         code.fix(fix)
  50
  51         # Verify that this is a valid field name for this type
  52         if self.field not in return_type.data_members:
  53             self.error("Invalid object field: " +
  54                        "Type '%s' does not have data member %s" % \
  55                        (return_type, self.field))
  56
  57         # Return the type of the field
  58         return return_type.data_members[self.field].type