MLRISC
MLRISC
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Basic Types
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Label Expressions
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Label Expressions


A label expression is a constant expression defined in terms of labels, or user defined constants. MLRISC uses the type labexp to represent label expressions. Label expressions are defined in the structure LabelExp.

The datatype labexp has the following definition:

   datatype labexp = 
       LABEL of Label.label
     | CONST of Constant.const
     | INT of int
     | PLUS of labexp * labexp
     | MINUS of labexp * labexp
     | MULT of labexp * labexp
     | DIV of labexp * labexp
     | LSHIFT of labexp * word
     | RSHIFT of labexp * word
     | AND of labexp * word
     | OR of labexp * word
 
In addition, the following functions are defined in labexp:
  • valueOf : labexp -> int -- Returns the value associated with a label expression
  • toString : labexp -> string -- Return the pretty printed representation of an expression
  • hash : labexp -> word -- Returns the hash value of an expression
  • == : labexp * labexp -> bool -- Tests whether two label expression are lexically identical

The type labexp is depends on client defined constants typed. The functor LabelExp is parameterized as follows.

    functor LabelExp(Constant : CONSTANT)
 

Lal George
Allen Leung
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Last modified: Thu Jan 9 19:38:15 EST 2003 by leunga@slinky