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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "symbol-table.h"
#define TABLE_SIZE 256
static CcmmcSymbol *hash_table[TABLE_SIZE];
static int hash(char *str) {
int idx = 0;
while (*str) {
idx = idx << 1;
idx += *str;
str++;
}
return (idx & (TABLE_SIZE-1));
}
/* returns the symbol table entry if found else NULL */
CcmmcSymbol *ccmmc_symbol_table_lookup(char *name) {
int hash_key;
CcmmcSymbol *symptr;
if (!name)
return NULL;
hash_key = hash(name);
symptr = hash_table[hash_key];
while (symptr) {
if (!(strcmp(name, symptr->lexeme)))
return symptr;
symptr = symptr->front;
}
return NULL;
}
void ccmmc_symbol_table_insert_id(char *name, int line_number) {
int hash_key;
CcmmcSymbol *ptr;
CcmmcSymbol *symptr = malloc(sizeof(CcmmcSymbol));
hash_key = hash(name);
ptr = hash_table[hash_key];
if (ptr == NULL) {
/* first entry for this hash_key */
hash_table[hash_key] = symptr;
symptr->front = NULL;
symptr->back = symptr;
} else {
symptr->front = ptr;
ptr->back = symptr;
symptr->back = symptr;
hash_table[hash_key] = symptr;
}
strcpy(symptr->lexeme, name);
symptr->line = line_number;
symptr->counter = 1;
}
static void print_symbol(CcmmcSymbol *ptr) {
printf(" Name = %s \n", ptr->lexeme);
printf(" References = %d \n", ptr->counter);
}
void ccmmc_symbol_table_print(void) {
puts("----- Symbol Table ---------");
for (int i = 0; i < TABLE_SIZE; i++)
{
CcmmcSymbol *symptr;
symptr = hash_table[i];
while (symptr != NULL)
{
printf("====> index = %d\n", i);
print_symbol(symptr);
symptr = symptr->front;
}
}
}
CcmmcSymbol **ccmmc_symbol_table_tmp(int *len) {
int cnt = 0;
for (int i = 0; i < TABLE_SIZE; i++)
{
CcmmcSymbol *symptr = hash_table[i];
while (symptr != NULL)
{
cnt++;
symptr = symptr->front;
}
}
CcmmcSymbol **tp = malloc(sizeof(CcmmcSymbol*)*cnt);
cnt = 0;
for (int i = 0; i < TABLE_SIZE; i++)
{
CcmmcSymbol *symptr = hash_table[i];
while (symptr != NULL)
{
tp[cnt++] = symptr;
symptr = symptr->front;
}
}
*len = cnt;
return tp;
}
// vim: set sw=4 ts=4 sts=4 et:
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