src/mem/slicc/ast/VarExprAST.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;
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  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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  26 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27
  28 from slicc.ast.ExprAST import ExprAST
  29 from slicc.symbols import Type, Var
  30
  31 class VarExprAST(ExprAST):
  32     def __init__(self, slicc, var):
  33         super(VarExprAST, self).__init__(slicc)
  34         self._var = var
  35
  36     def __repr__(self):
  37         return "[VarExprAST: %r]" % self._var
  38
  39     @property
  40     def name(self):
  41         return str(self._var)
  42
  43     @property
  44     def var(self):
  45         var = self.symtab.find(self._var, Var)
  46         if not var:
  47             self.error("Unrecognized variable: %s", self._var)
  48         return var
  49
  50     def assertType(self, type_ident):
  51         expected_type = self.symtab.find(type_ident, Type)
  52
  53         if not expected_type:
  54             self.error("There must be a type '%s' declared in this scope",
  55                        type_ident)
  56
  57         if self.var.type != expected_type:
  58             self.error("Incorrect type: " + \
  59                        "'%s' is expected to be type '%s' not '%s'",
  60                        self.var.ident, expected_type, self.var.type)
  61
  62     def generate(self, code):
  63         fix = code.nofix()
  64         code("${{self.var.code}}")
  65         code.fix(fix)
  66         return self.var.type