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symtab.h
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symtab.h
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/****************************************************/
/* File: symtab.h */
/* Symbol table interface for the TINY compiler */
/* (allows only one symbol table) */
/* Compiler Construction: Principles and Practice */
/* Kenneth C. Louden */
/****************************************************/
#ifndef _SYMTAB_H_
#define _SYMTAB_H_
#include "globals.h"
/* SIZE is the size of the hash table */
#define SIZE 211
/* 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;
ExpType type;
int isArray;
LineList lines;
int memloc ; /* memory location for variable */
struct BucketListRec * next;
} * BucketList;
/* The record for each scope,
* including name, its bucket,
* and parent scpoe.
*/
typedef struct ScopeListRec
{ char * name;
BucketList bucket[SIZE];
struct ScopeListRec * parent;
struct ScopeListRec * next;
} * ScopeList;
/* 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 * scope, char * name, ExpType type, int lineno, int loc, int isArray );
/* Function st_lookup returns the memory
* location of a variable or -1 if not found
*/
BucketList st_lookup ( char * scope, char * name );
BucketList st_lookup_excluding_parent ( char * scope, char * name );
int st_get_location( char * scope, char * name );
ScopeList getScope(char * scope);
int checkArray(char *scope, char *name);
/* Procedure printSymTab prints a formatted
* listing of the symbol table contents
* to the listing file
*/
void printSymTab(FILE * listing);
#endif