symtab.h

/****************************************************/
/* File: symtab.h                                   */
/* Symbol table interface for the TINY compiler     */
/* (allows only one symbol table)                   */
/* C- Compiler Project				    */
/* ZEBRA 	                                    */
/****************************************************/

#ifndef _SYMTAB_H_
#define _SYMTAB_H_

/* SIZE is the size of the hash table */
#define SIZE 211

/* MAX_SCOPE is maximum allowed scope can be changed for larger programs*/
#define MAX_SCOPE 8

/* the list of line numbers of the source 
 * code in which a variable is referenced
 */
typedef struct LineListRec
   { int lineno;
     struct LineListRec * next;
   } * LineList;

/* The record in the bucket lists for
 * each variable, including name, 
 * assigned memory location, and
 * the list of line numbers in which
 * it appears in the source code
 */
typedef struct BucketListRec
   { char * name;
     LineList lines;
     int memloc ; /* memory location for variable */
     int scope;   /* scope of the variable */
     int isParam;  /* param */
     int fun_start; /*function start location */
     struct BucketListRec * next;
   } * BucketList;

/* the hash table */
//static BucketList hashTable[SIZE];

static struct ScopeList{

	 BucketList hashTable[SIZE];
} Scope[MAX_SCOPE];


/* Procedure st_insert inserts line numbers and
 * memory locations into the symbol table
 * loc = memory location is inserted only the
 * first time, otherwise ignored
 */
void st_insert( char * name, int lineno, int loc ,int scope,int isparam);

/* Function st_lookup returns the memory 
 * location of a variable or -1 if not found
 */
int st_lookup ( char * name,int scope );

/* Function fun_lookup returns the  bucket 
 * location of a funtion or NULL if not found
 */
BucketList  fun_lookup ( char * name ,int sp);

/* Function var_lookup returns the  bucket 
 * location of a var or NULL if not found
 */
BucketList  var_lookup ( char * name ,int sp);

/* Procedure printSymTab prints a formatted 
 * listing of the symbol table contents 
 * to the listing file
 */
void printSymTab(FILE * listing);

#endif