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Copy pathEELcompiler.py
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EELcompiler.py
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# coding: utf-8
# In[91]:
import sys
global lexout
global token
global lines
global cnt
global quads
global scopes
global nestingLevel
global offsetVal
global notSubProg #flag gia thn paragwgh H oxi tou C kwdika
global mainFrameLength
global asmFile
global labelCnt
global procLabel
notSubProg = True
quads = []
scopes = []
cnt = 0
nestingLevel = -1
offsetVal = 12
mainFrameLength = 0
lines = {}
count = 1
lineNum = 1
en = 0
labelCnt = 0
procLabel = {}
# In[2]:
def gnlvcode(var):
scope,offset,parMode = findDeclaration(var)
asmFile.write('lw $t0,-4($sp)\n')
for i in range(nestingLevel,scope+1,- 1):
asmFile.write('lw $t0,-4($t0)\n')
asmFile.write('add $t0,$t0,-'+ str(offset) +'\n')
# In[3]:
def findDeclaration(name):
for i in range(nestingLevel,-1,-1):
for j in range(len(scopes[i])):
if(name == scopes[i][j][0] and len(scopes[i][j]) == 2): #[name, offset]
return i, scopes[i][j][1], None
elif(name == scopes[i][j][0] and len(scopes[i][j]) == 3): #[name, offset, parMode]
return i, scopes[i][j][1], scopes[i][j][2]
elif(name == scopes[i][j][0] and len(scopes[i][j]) == 4): #[name,[...],startQuad,framelength]
return -1,scopes[i][j][3], i
print('error, variable/proc/func', name, ' is not defined')
print('line',lineNum,':',lines[lineNum])
exit()
# In[4]:
def removeLastScope():
global nestingLevel
global scopes
scopes.pop(nestingLevel)
nestingLevel -= 1
# In[5]:
def addScope():
global nestingLevel
global offsetVal
global scopes
scopes.append([])
offsetVal = 12
nestingLevel += 1
# In[6]:
def loadvr(v,r):
global asmFile
tr = '$t' + str(r)
if( v.isdigit() or v.lstrip('-').isdigit()): #an einai stathera
asmFile.write('li '+tr+','+v+'\n')
else:
scopeLvl, offset, parMode = findDeclaration(v)
if(scopeLvl == 0): #an einai dhlwmneh sthn main
asmFile.write('lw '+tr+',-'+str(offset)+'($s0)\n')
elif scopeLvl==nestingLevel: #an einai dhlwmneh se AUTO to scope
if(parMode == 'in' or parMode == None): #"parmode = in" H "t.m. ara parmode = None" H "T_i"
asmFile.write('lw '+tr+',-'+str(offset)+'($sp)\n')
elif(parMode == 'inout'): #"parmode = inout"
asmFile.write('lw $t0,-'+str(offset)+'($sp)\n')
asmFile.write('lw '+tr+',($t0)\n')
else: #an einai dhlwmneh se ALLO scope
if(parMode == 'in' or parMode == None): #"parmode = in" H "t.m. ara parmode = None"
gnlvcode(v)
asmFile.write('lw '+tr+',($t0)\n')
elif(parMode == 'inout'): #"parmode = inout"
gnlvcode(v)
asmFile.write('lw $t0,($t0)\n')
asmFile.write('lw '+tr+',($t0)\n')
# In[7]:
def storerv(r,v):
global asmFile
tr = '$t' + str(r)
scopeLvl, offset, parMode = findDeclaration(v)
if(scopeLvl == 0):
asmFile.write('sw '+tr+',-'+str(offset)+'($s0)\n')
elif(scopeLvl == nestingLevel):
if(parMode == 'in' or parMode == None or ('T_' in v)):
asmFile.write('sw '+tr+',-'+str(offset)+'($sp)\n')
elif(parMode == 'inout'):
asmFile.write('lw $t0,-'+str(offset)+'($sp)\n')
asmFile.write('sw '+tr+',($t0)\n')
else:
if(parMode == 'in' or parMode == None):
gnlvcode(v)
asmFile.write('sw '+tr+',($t0)\n')
elif(parMode == 'inout'):
gnlvcode(v)
asmFile.write('lw $t0,($t0)\n')
asmFile.write('sw '+tr+',($t0)\n')
# In[8]:
def toAsm(stQuad):
global labelCnt
parCnt = 0
asmFile.write('L'+str(labelCnt)+':\n')
procLabel[quads[stQuad][1]] = labelCnt
labelCnt += 1
if nestingLevel > 0:
asmFile.write('sw $ra,($sp)\n' )
elif nestingLevel == 0: #main
asmFile.write('Lmain: \n')
asmFile.write('add $sp,$sp,' + str(mainFrameLength) + '\n')
asmFile.write('move $s0,$sp\n')
for i in range(stQuad+1,len(quads)-1): #to +-1 einai gia na MHN pernoume to begin kai to end_block
#ta opoia ta diaxeirizomaste panw kai katw ap'to for antistoixa.
if(quads[i][0] == '' or quads[i][0] == 'halt'):
asmFile.write('L'+str(labelCnt)+':\n')
else:
asmFile.write('L'+str(labelCnt)+': ')
labelCnt += 1
if(quads[i][0] == ':='):
loadvr(quads[i][1],1)
storerv(1,quads[i][3])
elif(quads[i][0] == '+'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('add $t1,$t1,$t2\n' )
storerv(1,quads[i][3])
elif(quads[i][0] == '-'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('sub $t1,$t1,$t2\n' )
storerv(1,quads[i][3])
elif(quads[i][0] == '*'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('mul $t1,$t1,$t2\n' )
storerv(1,quads[i][3])
elif(quads[i][0] == '/'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('div $t1,$t1,$t2\n' )
storerv(1,quads[i][3])
elif(quads[i][0] == '<'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('blt $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif(quads[i][0] == '<=' ):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('ble $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif( quads[i][0] == '>' ):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('bgt $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif(quads[i][0] == '>='):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('bge $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif(quads[i][0] == '<>'):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('bne $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif(quads[i][0] == '='):
loadvr(quads[i][1],1)
loadvr(quads[i][2],2)
asmFile.write('beq $t1,$t2,L'+str(quads[i][3]) + '\n' )
elif(quads[i][0] == 'jump'):
asmFile.write('j L'+ str(quads[i][3]) + '\n' )
elif(quads[i][0] == 'print'):
asmFile.write('li $v0,1\n')
loadvr(quads[i][1],1)
asmFile.write('move $a0,$t1\n' )
asmFile.write('syscall\n' )
elif(quads[i][0] == 'input'):
asmFile.write('li $v0,5\n')
asmFile.write('syscall\n')
asmFile.write('move $t1,$v0\n')
storerv(1,quads[i][3])
elif(quads[i][0] == 'ret'):
loadvr(quads[i][1],1)
asmFile.write('lw $t0,-8($sp)\n')
asmFile.write('sw $t1,($t0)\n')
elif(quads[i][0] == 'ret'):
loadvr(quads[i][1],1)
asmFile.write('lw $t0,-8($sp)\n')
asmFile.write('sw $t1,($t0)\n')
elif(quads[i][0] == 'par'):
if(parCnt == 0):
for j in range (i,len(quads)):
if(quads[j][0] == 'call'):
typeOf, frameLength, nothing = findDeclaration(quads[j][1])
if(typeOf == -1):
asmFile.write('add $fp,$sp,'+ str(frameLength) +'\n')
break
if(quads[i][2] == 'in'):
loadvr(quads[i][1],0)
asmFile.write('sw $t0,-' + str(12+4*parCnt) + '($fp)\n')
elif(quads[i][2] == 'inout'):
scope, offset, parMode = findDeclaration(quads[i][1])
if scope == nestingLevel:
if parMode == 'in' or parMode == None:
asmFile.write('add $t0,$sp,-'+ str(offset) +'\n')
asmFile.write('sw $t0,-' + str(12+4*parCnt) + '($fp)\n')
elif parMode == 'inout':
asmFile.write('lw $t0,-'+ str(offset) +'($sp)\n')
asmFile.write('sw $t0,-' + str(12+4*parCnt) + '($fp)\n')
elif scope != nestingLevel:
if parMode == 'in' or parMode == None:
gnlvcode(quads[i][1])
asmFile.write('sw $t0,-' + str(12+4*parCnt) + '($fp)\n')
elif parMode == 'inout':
gnlvcode(quads[i][1])
asmFile.write('lw $t0,($t0)\n')
asmFile.write('sw $t0,-' + str(12+4*parCnt) + '($fp)\n')
elif(quads[i][2] == 'ret'):
scope , offset, nothing = findDeclaration(quads[i][1])
asmFile.write('add $t0,$sp,-'+ str(offset) +'\n')
asmFile.write('sw $t0,-8($fp)\n')
parCnt += 1
elif(quads[i][0] == 'call'):
parCnt = 0
typeOf, frameLength, scope = findDeclaration(quads[i][1])
if(scope == nestingLevel):
asmFile.write('lw $t0,-4($sp)\n')
asmFile.write('sw $t0,-4($fp)\n')
elif(scope != nestingLevel):
asmFile.write('sw $sp,-4($fp)\n')
asmFile.write('add $sp,$sp,'+ str(frameLength) +'\n')
asmFile.write('jal L' + str(procLabel[quads[i][1]]) + '\n')
asmFile.write('add $sp,$sp,-'+ str(frameLength) +'\n')
asmFile.write('L'+str(labelCnt)+':\n')
labelCnt += 1
if nestingLevel > 0:
asmFile.write('lw $ra,($sp)\n')
asmFile.write('jr $ra\n')
# In[9]:
def lex():
global lineNum
global en
global nextChar
global lastChar
if(en == 0):
nextChar = file.read(1)
else:
nextChar = lastChar
lastChar = state_0(nextChar)
# In[68]:
def state_0(nextChar):
global en
global lineNum
global lexout
global token
en = 0
endOfComm = True
while nextChar == " " or nextChar == "\t" or nextChar == "\n":
if(nextChar == '\n'):
lineNum += 1
nextChar = file.read(1)
if(nextChar.isalpha()):
en = 1
return (state_1(nextChar))
elif(nextChar.isdigit()):
en = 1
return (state_2(nextChar))
elif(nextChar == '+'):
lexout = '+'
token = 'plustk'
return()
elif(nextChar == '-'):
lexout = '-'
token = 'minustk'
return()
elif(nextChar == '*'):
lexout = '*'
token = 'multk'
return()
elif(nextChar == '/'):
nextChar = file.read(1)
if(nextChar == '*'):
lineOfCom = lineNum
nextChar = file.read(1)
while(endOfComm):
if(nextChar == '\n'):
nextChar = file.read(1)
lineNum += 1
elif(nextChar == '*'):
nextChar = file.read(1)
if(nextChar == '/'):
nextChar = file.read(1)
return(state_0(nextChar))
endOfComm = False
elif(nextChar == ''):
print('EOF error - comment started at line',
lineOfCom,'and never closed until End Of File.')
print('line',lineOfCom,':',lines[lineOfCom])
exit()
#termatismos tou programmatos ara kai ths loupas
else:
nextChar = file.read(1)
elif(nextChar == '/'):
nextChar = file.read(1)
while(nextChar != '\n' and nextChar != ''):
nextChar = file.read(1)
return(state_0(nextChar))
else:
lexout = '/'
token = 'divtk'
en = 1
return(nextChar)
return()
elif(nextChar == '='):
lexout = '='
token = 'equaltk'
return()
elif(nextChar == '<'):
nextChar = file.read(1)
if(nextChar == '>'):
lexout = '<>'
token = 'notequaltk'
return()
elif(nextChar == '='):
lexout = '<='
token = 'lessequaltk'
return()
else:
lexout = '<'
token = 'lesstk'
en = 1
return(nextChar)
elif(nextChar == '>'):
nextChar = file.read(1)
if(nextChar == '='):
lexout = '>='
token = 'greaterequaltk'
return()
else:
lexout = '>'
token = 'greatertk'
en = 1
return(nextChar)
elif(nextChar == ':'):
nextChar = file.read(1)
if(nextChar == '='):
lexout = ':='
token = 'assignmenttk'
return()
else:
en = 1
lexout = ':'
token = 'colontk'
return(nextChar)
elif(nextChar == ','):
lexout = ','
token = 'commatk'
return()
elif(nextChar == ';'):
lexout = ';'
token = 'qmarktk'
return()
elif(nextChar == '('):
lexout = '('
token = 'openbrackettk'
return()
elif(nextChar == ')'):
lexout = ')'
token = 'closebrackettk'
return()
elif(nextChar == ''):
#EOF
lexout = ''
token = ''
return('EOF')
elif(nextChar == '['):
lexout = '['
token = 'opensquarebrackettk'
return()
elif(nextChar == ']'):
lexout = ']'
token = 'closesquarebrackettk'
return()
else:
#error
print('wrong character',nextChar,' at line:',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
# In[69]:
def state_1(nextChar):
global lexout
global token
count = 0
strToken = ''
tks = ['program','endprogram','declare','enddeclare','if','then','else',
'endif','while','endwhile','repeat','endrepeat','exit',
'switch','case','endswitch','forcase','when','endforcase','procedure',
'endprocedure','function','endfunction','call','return','in',
'inout','and','or', 'not','true','false','input','print']
while(nextChar.isalpha() or nextChar.isdigit()):
if(count < 30):
strToken += nextChar
count += 1
nextChar = file.read(1)
token = 'idtk' #an den einai sth lista afou einai alfarithmitiko tha nai idtk
if(strToken in tks):
token = strToken+'tk'
lexout = strToken
return(nextChar)
# In[70]:
def state_2(nextChar):
global lexout
global token
constToken = ""
while(nextChar.isdigit()):
constToken += nextChar
nextChar = file.read(1)
token = 'consttk'
lexout = constToken
if(int(lexout) > 32767):
print('Variable out ouf bounds. Expected number between -32767 and 32767 but number'
,lexout,',line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
return(nextChar)
# In[71]:
def main():
global token
lex()
program()
# In[72]:
def program():
global token
if token == 'programtk':
lex()
if token == 'idtk':
addScope()
name = lexout
lineOfProgram = lineNum
lex()
block(name,1) # 1 : programBlock
if token == 'endprogramtk':
removeLastScope()
lineOfEnd = lineNum
lex()
if token != '':
print('End of program found at line'
,lineOfEnd,'but there is code below it')
print('line',lineOfEnd,':',lines[lineOfEnd])
exit()
else:
print('Found program at line',lineOfProgram,'but endprogram not found')
print('line',lineOfProgram,':',lines[lineOfProgram])
exit()
else:
print('Expected Id for program at line:', lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
else:
print('Start of program not found')
print('line',lineNum,':',lines[lineNum])
exit()
# In[73]:
def block(name,typeOfBlock):
global offsetVal
global mainFrameLength
foundRet = False
declarations()
buffLastOf = offsetVal
subprograms()
if(nestingLevel >= 1):
scopes[nestingLevel-1][ len(scopes[nestingLevel-1]) - 1 ].append(nextQuad())
startQ = nextQuad()
genQuad('begin_block',name,'','')
tempOffset = offsetVal
offsetVal = buffLastOf
statements()
if(nestingLevel >= 1):
scopes[nestingLevel-1][len(scopes[nestingLevel-1])-1].append(offsetVal)
else:
mainFrameLength = offsetVal
offsetVal = tempOffset
# typeOfBlock = 1 for main program / typeOfBlock = 2 for proc / typeOfBlock = 3 for func
# Only for main program:
if(typeOfBlock == 1):
genQuad('halt','','','')
elif(typeOfBlock == 2):
for i in range(startQ,len(quads)):
if(quads[i][0] == 'ret'):
print('Found return in procedure ' + quads[startQ][1] + '. Return is only allowed in function.')
# exit()
elif(typeOfBlock == 3):
for i in range(startQ,len(quads)):
if(quads[i][0] == 'ret'):
foundRet = True
if(foundRet == False):
print('Return not found in function ' + quads[startQ][1] + '. ALL functions must return a value')
exit()
genQuad('end_block',name,'','')
toAsm(startQ)
# In[74]:
def declarations():
global token
global offsetVal
if token == 'declaretk':
lineOfDec = lineNum
lex()
varlist()
if token == 'enddeclaretk':
lex()
else:
print('Started declare at line',lineOfDec,'but enddeclare not found')
print('line',lineOfDec,':',lines[lineOfDec])
exit()
# In[75]:
def varlist():
global offsetVal
tempIdList = []
if token == 'idtk':
scopes[nestingLevel].append([lexout,offsetVal])
offsetVal += 4
tempIdList.append(lexout)
lex()
while token == 'commatk':
lex()
if(token == 'idtk'):
if(lexout in tempIdList):
print('The variable ',lexout,' all ready exists in line ',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
tempIdList.append(lexout)
scopes[nestingLevel].append([lexout,offsetVal])
offsetVal += 4
lex()
if(token != 'enddeclaretk' and token != 'commatk'):
print('Expected comma "," after variable at line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
else:
print('variable not found after comma (",") in declarations at line :',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
# In[76]:
def subprograms():
global notSubProg
while(token == 'proceduretk' or token == 'functiontk'):
notSubProg = False #Flag to stop extract in .c for this file
procorfunc()
# In[77]:
def procorfunc():
if(token == 'proceduretk'):
lineOfProc = lineNum
lex()
if(token == 'idtk'):
addScope()
name = lexout
lex()
procorfuncbody(name,2) #passing the name and the type : procedure
if(token == 'endproceduretk'):
removeLastScope()
lex()
else:
print('Started procedure at line',lineOfProc,'but endprocedure not found')
print('line',lineOfProc,':',lines[lineOfProc])
exit()
else:
print('id not found after procedure declaration at line',lineOfProc)
print('line',lineOfProc,':',lines[lineOfProc])
exit()
elif(token == 'functiontk'):
lineOfFunc = lineNum
lex()
if(token == 'idtk'):
addScope()
name = lexout
lex()
procorfuncbody(name,3) #passing the name and the type : function
if(token == 'endfunctiontk'):
removeLastScope()
lex()
else:
print('Started procedure at line',lineOfFunc,'but endprocedure not found')
print('line',lineOfFunc,':',lines[lineOfFunc])
exit()
else:
print('variable not found after function declaration at line',lineOfFunc)
print('line',lineOfFunc,':',lines[lineOfFunc])
exit()
# In[78]:
def procorfuncbody(name,typeOf):
global nestingLevel
scopes[nestingLevel-1].append([name])
formalpars()
block(name,typeOf)
# In[79]:
def formalpars():
if(token == 'openbrackettk'):
lineOfBrack = lineNum
lex()
formalparlist()
if(token == 'closebrackettk'):
lex()
else:
print('Found open parenthesis "(" at line',lineOfBrack,'but close parenthesis ")" not found')
print('line',lineOfBrack,':',lines[lineOfBrack])
exit()
else:
print('Expected open parenthesis "(" at line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
# In[80]:
def formalparlist():
scopes[nestingLevel-1][ len(scopes[nestingLevel-1]) - 1 ].append([])
formalparitem()
while token == 'commatk':
lineOfComma = lineNum
lex()
if(token == 'intk' or token == 'inouttk'):
formalparitem()
else:
print('Expected in/inout after "," at line',lineOfComma)
print('line',lineOfComma,':',lines[lineOfComma])
exit()
# In[81]:
def formalparitem():
global offsetVal
if token == 'intk' or token == 'inouttk':
refBuffer = lexout
scopes[nestingLevel-1][ len(scopes[nestingLevel-1]) - 1 ][1].append(lexout)
lex()
if token == 'idtk':
scopes[nestingLevel].append([lexout,offsetVal,refBuffer])
offsetVal += 4
lex()
else:
print('Expected variable after in/inout at line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
# In[82]:
def statements():
exitList = []
if(token == 'exittk'):
exitList = makeList(nextQuad())
genQuad('jump','','','')
exitList3 = statement()
exitList = merge(exitList,exitList3)
while token == 'qmarktk':
lex()
if (token == 'idtk' or token == 'iftk'
or token == 'whiletk' or token == 'exittk'
or token == 'switchtk' or token == 'failuretk'
or token == 'calltk' or token == 'returntk'
or token == 'printtk' or token == 'inputtk'
or token == 'repeattk' or token == 'forcasetk'):
if(token == 'exittk'):
exitList2 = makeList(nextQuad())
genQuad('jump','','','')
exitList = merge(exitList,exitList2)
exitList3 = statement()
exitList = merge(exitList,exitList3)
if (token == 'idtk' or token == 'iftk'
or token == 'whiletk' or token == 'exittk'
or token == 'switchtk' or token == 'failuretk'
or token == 'calltk' or token == 'returntk'
or token == 'printtk' or token == 'inputtk' or token == 'repeattk' or token == 'forcasetk'):
print('expected ";" between statements at line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
return(exitList)
# In[83]:
def statement():
if(token == 'idtk'):
assignmentStat()
elif(token == 'iftk'):
return ifStat()
elif(token == 'whiletk'):
return whileStat()
elif(token == 'exittk'):
exitStat()
elif(token == 'switchtk'):
return switchStat()
#failureStat()
elif(token == 'calltk'):
callStat()
elif(token == 'forcasetk'):
return forCaseStat()
elif(token == 'returntk'):
returnStat()
elif(token == 'repeattk'):
repeatStat()
elif(token == 'printtk'):
printStat()
elif(token == 'inputtk'):
inputStat()
# In[84]:
def assignmentStat():
if(token == 'idtk'):
var = lexout
lex()
if(token == 'assignmenttk'):
lex()
output = expression()
genQuad(':=',output,'',var)
return output
else:
print('expression expected after ":=" at line',lineNum)
print('line',lineNum,':',lines[lineNum])
exit()
# In[85]:
def ifStat():
if(token == 'iftk'):
lineOfIf = lineNum
lex()
bTrue,bFalse = condition()
if(token == 'thentk'):
backpatch(bTrue,nextQuad())
lex()
exitList = statements()
ifList = makeList(nextQuad())
genQuad('jump','','','')
backpatch(bFalse,nextQuad())
exitList2 = elsePart()
exitList = merge(exitList,exitList2)
backpatch(ifList,nextQuad())
if(token == 'endiftk'):
lex()
else:
print('Found if statement at line',lineOfIf,'but endif not found')
print('line',lineOfIf,':',lines[lineOfIf])
exit()
else:
print('Expected "then" after if statement at line',lineOfIf)
print('line',lineOfIf,':',lines[lineOfIf])
exit()
return(exitList)
# In[86]:
def elsePart():
if(token == 'elsetk'):
lex()
exitList = statements()
return(exitList)
#pou tha ginei to epomeno lex? ---> mesa sto statement pou tha vrei
# In[29]:
def repeatStat():
if(token == 'repeattk'):
sQuad = nextQuad()
lineOfRep = lineNum
lex()
exitList = statements()
if(token == 'endrepeattk'):
genQuad('jump','','',sQuad)
backpatch(exitList,nextQuad())
lex()
else:
print('Found repeat statement at line',lineOfRep,'but endrepeat not found',)
print('line',lineOfRep,':',lines[lineOfRep])
exit()
# In[30]:
def exitStat():
if(token == 'exittk'):
lex()
# In[31]:
def whileStat():
if(token == 'whiletk'):
bQuad = nextQuad()
lineOfWhile = lineNum
lex()
bTrue,bFalse = condition()
backpatch(bTrue,nextQuad())
exitList = statements()
genQuad('jump','','',bQuad)
backpatch(bFalse,nextQuad())
if(token == 'endwhiletk'):
lex()
else:
print('Found while statement at line',lineOfWhile,'but endwhile not found',)
print('line',lineOfWhile,':',lines[lineOfWhile])
exit()
return(exitList)
# In[32]:
def switchStat():
if(token == 'switchtk'):
lineOfSwitch = lineNum
lex()
ePlace1 = expression()
if(token == 'casetk'):
lineOfCase = lineNum
lex()
ePlace2 = expression()
if(token == 'colontk'):
switchTrueList = makeList(nextQuad())
genQuad('=',ePlace1,ePlace2,'')
switchFalseList = makeList(nextQuad())
genQuad('jump','','','')
backpatch(switchTrueList,nextQuad())
lex()
exitList = statements()
switchList = makeList(nextQuad())
genQuad('jump','','','')
backpatch(switchFalseList,nextQuad())
else:
print('Expected ":" after expression in case at line',lineOfCase)
print('line',lineOfCase,':',lines[lineOfCase])
exit()
else:
print('At least one case needed for switch at line',lineOfSwitch)
print('line',lineOfSwitch,':',lines[lineOfSwitch])
exit()
while(token == 'casetk'):
lineOfCase = lineNum
lex()
ePlace2 = expression()
if(token == 'colontk'):
switchTrueList = makeList(nextQuad())
genQuad('=',ePlace1,ePlace2,'')
switchFalseList = makeList(nextQuad())
genQuad('jump','','','')
backpatch(switchTrueList,nextQuad())
lex()
exitList2 = statements()
switchList2 = makeList(nextQuad())
genQuad('jump','','','')
backpatch(switchFalseList,nextQuad())
switchList = merge(switchList,switchList2)
exitList = merge(exitList,exitList2)
else:
print('Expected ":" after expression in case at line',lineOfCase)
print('line',lineOfCase,':',lines[lineOfCase])
exit()
if(token == 'endswitchtk'):
backpatch(switchList,nextQuad())