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Symbols are used to refer to variables, labels, and procedures. Each
symbol is represented by a unique instance of a simple_sym
structure, which records the kind of symbol (VAR_SYM,
LABEL_SYM, or PROC_SYM) and the symbol name. For
variable symbols, the simple_sym structure includes another
field to record the type of the variable. Other information about
symbols is not accessible in Simple-SUIF but is recorded in the
underlying SUIF symbol structures pointed to by the suif_sym
fields in the simple_sym structures.
Rules for manipulating Simple-SUIF symbols are similar to those for
types. As the data in a simple_sym structure does not
uniquely define the symbol, always refer to symbols by the addresses of
their simple_sym structures and use these addresses to test
for equality. As with types, you cannot directly modify or create new
simple_sym structures. However, the library provides several
functions for creating new symbols. The new_label function
creates and returns a new label symbol. New local variables are
generated by the new_register function (see section Registers).
There is currently no way to create new global variables or procedure
symbols.
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