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symboltable.py
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#!/usr/bin/env python
from sys import argv
import sys
redf_flag=[]
ubdf_flag=[]
temp_sym=[]
lab_sym=[]
sym_val=[]
sym_def=['db','dw','dd','resb','resw','resd']
sym_udf=['global','extern','jmp','je','jne','jg','lge','lnge','jng','jl','jle','lnle','jnl','jz','jnz','loop']
sym_equ=['equ']
sym_err=[['1','symbol %r redefined']]
cnt=1
symb=[]
def constr(val2):
val3=','.join(val2)
val4=val3.split(',')
val5=[]
for i in range(len(val4)):
if(val4[i]=='0'):
for j in range(i):
val5.append(val4[j])
val6=','.join(val5)
val7=val6.replace(","," ")
val8=val7.replace('"','')
return val8
def find_size(val1,n):
ss=val1.split(',')
sn=len(ss)
return(sn*n)
def count_len(val1):
val2=val1.split('-')
temp=val2[1]
for i in range(len(sym_val)):
if temp in sym_val[i][1]:
return sym_val[i][5]
def check_size(val1,n,s):
val2=list(val1)
val3=ord(val2[0])
if val3 in range(48,58):
return ((int(val1))*s)
def find_val(val):
for i in range(len(sym_val)):
if val[i] in sym_val[i][1]:
return sym_val[i][6]
def find_sym(list2,n):
sym_num=[]
symbol=[]
values=[]
size =[]
line_no=[]
sym_type=[]
define_un=[]
section=[]
global cnt
for i in range(len(list2)):
if list2[i] in sym_def:
symbol.append(list2[i-1]) #append symbol name in symbol list
sym_num.append(cnt)
cnt+=1
if list2[i] in sym_def[:4]:
section.append('dat')
if list2[i] in sym_def[5:]:
section.append('bss')
if (list2[i]=='db'):
val1=[]
for j in range(i+1,len(list2)):
if(list2[j]!='0'):
val1.append(list2[j])
val2=constr(val1)
values.append(val2)
if (list2[i]=='dw' or list2[i]=='dd' or list2[i]=='dq' or list2[i]=='dt'):
values.append(list2[i+1])
if (list2[i]=='resb' or list2[i]=='resw' or list2[i]=='resd' or list2[i]=='resq' or list2[i]=='rest'):
values.append('-')
if list2[i] in sym_def:
define_un.append('D')
else:
define_un.append('U')
if list2[i]=='db':
size.append(len(val2))
if list2[i]=='dw':
siz=find_size(list2[i+1],2)
size.append(siz)
if list2[i]=='dd':
siz=find_size(list2[i+1],4)
size.append(siz)
if list2[i]=='resb':
siz=check_size(list2[i+1],n,1)
size.append(siz)
if list2[i]=='resw':
siz=check_size(list2[i+1],n,2)
size.append(siz)
if list2[i]=='resd':
siz=check_size(list2[i+1],n,4)
size.append(siz)
line_no.append(n)
sym_type.append(list2[i])
sym_val.append(line_no+symbol+define_un+sym_num+section+size+values+sym_type)
if list2[i] in sym_udf and len(list2)==2:
line_no.append(n)
section.append('txt')
if list2[i]=='global' or list2[i]=='extern':
symbol.append(list2[i+1])
sym_num.append(cnt)
cnt+=1
if list2[i] in sym_udf[2:]:
symbol.append(list2[i+1])
sym_num.append(cnt)
cnt+=1
if list2[i] in sym_udf:
define_un.append('U')
else:
define_un.append('D')
size.append('-')
values.append('-')
sym_type.append('-')
sym_val.append(line_no+symbol+define_un+sym_num+section+size+values+sym_type)
if list2[i] in sym_equ:
line_no.append(n)
section.append('dat')
symbol.append(list2[i-1])
sym_num.append(cnt)
cnt+=1
if list2[i] in sym_udf:
define_un.append('U')
else:
define_un.append('D')
temp=count_len(list2[i+1])
size.append(temp)
val1=list2[i+1].split('-')
val2=find_val(val1[1])
values.append(val2)
sym_type.append('-')
sym_val.append(line_no+symbol+define_un+sym_num+section+size+values+sym_type)
if list2[i] in sym_udf and len(list2)>=2:
temp=list2[i+1]
lab_sym.append(temp)
if list2==[]:
return
else:
val1=list2[0]
val2=list(val1)
for i in range(len(val2)):
if val2[i]==':':
val3=''.join(val2[:i])
temp_sym.append(val3)
def sym_table(f_name):
global filename
filename=f_name
op=open(f_name,"r")
l=op.read()
ll=l.split('\n')
ln=len(ll)
of=open(f_name,"r+")
for i in range(1,ln):
line1=of.readline()
list1=line1.split()
find_sym(list1,i)
if 0 in redf_flag:
sys.exit()
pf=open(f_name,"r+")
for j in range(1,ln):
line2=pf.readline()
list2=line2.split()
k=0
for k in range(len(sym_val)):
symb.append(sym_val[k][1])
def write_file():
fo=open("SymbolTable.txt","w+")
for i in range(len(sym_val)):
fo.write(str(sym_val[i][3])+'\t'+str(sym_val[i][0])+'\t'+sym_val[i][1]+'\t'+str(sym_val[i][4])+'\t'+str(sym_val[i][5])+'\t'+sym_val[i][6]+'\n')