| | | Identifier Descriptors |
Identifier
descriptors are actually quite simple. There is one such descriptor
for each distinct identifier used in the program.3 A C language
structure specification for the type identdesc used to store
identifier descriptors is shown in figure *.
typedef struct iddesc {
char *name; /* The character string for the identifier */
struct iddesc *hashlink; /* Link for hash chains used by scanner */
union dcldesc *declstack; /* Head pointer for stack of declarations */
/* in open scopes. */
} identdesc;
Declaration for Type `identdesc'
The name field is just a pointer to the characters that form
the identifier. The hashlink field is used to maintain lists of
identifier with the same hash value when building the hash table used
by the scanner. It will not be of concern to you when doing semantic
processing. The declstack component is to be used as a pointer
to the head of the linked list representing the stack of declarations
of the identifier found in scopes that are still open. The scanner
initializes this field to NULL.
| | | Identifier Descriptors |