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  17 <H1><A NAME="SEC51" HREF="suif1_toc.html#TOC51">Symbols</A></H1>
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  27 SUIF symbols are stored in the symbol tables (see section <A HREF="suif1_40.html#SEC40">Symbol Tables</A>) to
  28 represent variables, labels, and procedures.  The <CODE>sym_node</CODE> class
  29 is the base class for all SUIF symbols.  This is an abstract class so it
  30 cannot be used directly.  The library also defines the
  31 <CODE>sym_node_list</CODE> class for lists of pointers to symbols.  Classes
  32 are derived from the <CODE>sym_node</CODE> class for each kind of symbol.
  33 Given an arbitrary symbol, the <CODE>kind</CODE> method identifies the kind of
  34 symbol and thus the derived class to which it belongs.  This method
  35 returns a value from the <CODE>sym_kinds</CODE> enumerated type.  The
  36 following values are defined in that enumeration:
  37
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  39 <DL COMPACT>
  40
  41 <DT><CODE>SYM_VAR</CODE>
  42 <DD>
  43 Variable symbol.  The <CODE>var_sym</CODE> class represents variable symbols.
  44
  45 <DT><CODE>SYM_LABEL</CODE>
  46 <DD>
  47 Label symbol.  The <CODE>label_sym</CODE> class represents label symbols.
  48
  49 <DT><CODE>SYM_PROC</CODE>
  50 <DD>
  51 Procedure symbol.  The <CODE>proc_sym</CODE> class represents procedure symbols.
  52 </DL>
  53
  54 <P>
  55 All symbols share some common fields including the symbol names.  These
  56 are described in the first section below.  Each kind of symbol also uses
  57 additional fields that are specific to that kind.  For example, variable
  58 symbols specify the types of the variables.  The subsequent sections
  59 describe the specific features of each kind of symbol.
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  62 <P>
  63 The <TT>`symbols.h'</TT> and <TT>`symbols.cc'</TT> files contain the source
  64 code for SUIF symbols.
  65
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  67
  68 <UL>
  69 <LI><A HREF="suif1_52.html#SEC52">Symbol Features</A>: Basic features of all symbols.
  70 <LI><A HREF="suif1_53.html#SEC53">Procedure Symbols</A>: Procedures.
  71 <LI><A HREF="suif1_54.html#SEC54">Label Symbols</A>: Labels.
  72 <LI><A HREF="suif1_55.html#SEC55">Variable Symbols</A>: Variables.
  73 </UL>
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