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runTimeCode.py
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174 lines (154 loc) · 6.46 KB
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class RunTimeCode:
def __init__(self, ST, TAC):
self.code = dict()
self.ST = ST
self.TAC = TAC
self.currentFunction = ''
self.registersCount = 1
self.labelCount = -1
self.labelBase = 'label'
self.resetRegisters()
def resetRegisters(self):
self.registerDescriptor = {
'$t0' : None, '$t1' : None, '$t2' : None, '$t3' : None, '$t4' : None, '$t5' : None,
'$t6' : None, '$t7' : None, '$t8' : None, '$t9' : None, '$s0' : None, '$s1' : None,
'$s2' : None, '$s3' : None, '$s4' : None }
self.freeRegisters = []
for register in self.registerDescriptor.keys():
self.freeRegisters.append(register)
self.busyRegisters = []
def fixLabels(self):
# convert jump line numbers to labels. MIPS supports labels
for function in self.TAC.code:
unresolvedLabels = {}
for line in self.TAC.code[function]:
if line[3] in ['COND_GOTO', 'GOTO']:
if line[2] in unresolvedLabels:
label = unresolvedLabels[line[2]]
else:
label = self.nameLabel()
unresolvedLabels[line[2]] = label
line[2] = label
lineNumber = -1
count = 0
for line in range(len(self.TAC.code[function])):
lineNumber += 1
if lineNumber in unresolvedLabels.keys():
effectiveLineNumber = lineNumber + count
self.TAC.code[function].insert(effectiveLineNumber, ['LABEL', unresolvedLabels[lineNumber], '', ''])
count += 1
del unresolvedLabels[lineNumber]
def nameLabel(self):
self.labelCount += 1
return self.labelBase + str(self.labelCount)
def putAbsoluteAddressInRegister(self, level, offset):
self.addLineToCode(['la', '$s5', '__myspace__', ''])
self.addLineToCode(['li', '$s6', level, ''])
self.addLineToCode(['sll', '$s6', '$s6', 2]) # 4x
self.addLineToCode(['add', '$s7', '$s5', '$s6'])
self.addLineToCode(['lw', '$s5', '0($s7)', ''])
self.addLineToCode(['li', '$s6', offset/4, ''])
self.addLineToCode(['sll', '$s6', '$s6', 2]) # 4x
self.addLineToCode(['add', '$s7', '$s5', '$s6']) # add offset
def addLineToCode(self, line):
self.code[self.currentFunction].append(line)
def addFunction(self, function):
self.currentFunction = function
self.code[function] = []
def getRegister(self, temp):
if temp in self.registerDescriptor.values():
register = self.ST.addressDescriptor[temp]['register']
else:
if len(self.freeRegisters) == 0:
register = self.busyRegisters.pop(0)
tempReg = self.registerDescriptor[register]
self.ST.addressDescriptor[tempReg]['register'] = None
self.registerDescriptor[register] = temp
if self.ST.addressDescriptor[tempReg]['memory'] != None:
(level, offset) = self.ST.addressDescriptor[tempReg]['memory']
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['sw', register, '0($s7)', ''])
self.ST.addressDescriptor[tempReg]['store'] = True
if self.ST.addressDescriptor[temp]['memory'] != None:
(level, offset) = self.ST.addressDescriptor[temp]['memory']
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['lw', register, '0($s7)', ''])
else:
register = self.freeRegisters.pop()
if self.ST.addressDescriptor[temp]['memory'] != None and self.ST.addressDescriptor[temp]['store']:
(level, offset) = self.ST.addressDescriptor[temp]['memory']
# print (level, offset)
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['lw', register, '0($s7)', ''])
self.ST.addressDescriptor[temp]['register'] = register
self.busyRegisters.append(register)
self.registerDescriptor[register] = temp
return register
def reloadParentRegisters(self, level, function):
for temp in self.ST.addressDescriptor:
tempEntry = self.ST.addressDescriptor[temp]
if tempEntry['memory'] != None and tempEntry['scope'] == function:
if tempEntry['memory'][0] <= level and tempEntry['register'] != None:
(level, offset) = tempEntry['memory']
register = tempEntry['register']
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['lw', register, '0($s7)', ''])
self.ST.addressDescriptor[temp]['store'] = True
def flushRegisters(self, level, function):
for temp in self.ST.addressDescriptor:
tempEntry = self.ST.addressDescriptor[temp]
if temp['memory'] != None and tempEntry['scope'] == function:
if temp['memory'][0] <= level and temp['register'] != None:
(level, offset) = tempEntry['memory']
register = tempEntry['register']
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['sw', register, '0($s7)', ''])
tempEntry['store'] = True
tempEntry['register'] = None
self.registerDescriptor[register] = None
self.freeRegisters.append(register)
self.busyRegisters.pop(self.busyRegisters.index(register))
def flushTemporary(self, temp):
tempEntry = self.ST.addressDescriptor[temp]
register = tempEntry['register']
if tempEntry['memory'] != None and tempEntry['register'] != None:
(level, offset) = tempEntry['memory']
register = tempEntry['register']
self.putAbsoluteAddressInRegister(level, offset)
self.addLineToCode(['sw', register, '0($s7)', ''])
tempEntry['store'] = True
tempEntry['register'] = None
self.registerDescriptor[register] = None
self.freeRegisters.append(register)
self.busyRegisters.pop(self.busyRegisters.index(register))
elif tempEntry['register'] != None:
self.registerDescriptor[register] = None
self.freeRegisters.append(register)
self.busyRegisters.pop(self.busyRegisters.index(register))
def printCode(self, fileName=''):
f = open('build/' + fileName + '.s', 'w')
data = open('lib/data.s').read()
f.write(data)
for functionName in self.TAC.code:
functionEntry = self.ST.functionlist[functionName]
for stringEntry in functionEntry['stringList']:
f.write('\t%s:\t.asciiz\t"%s"\n' %(stringEntry[0], stringEntry[1]))
f.write('\n.text\n')
for functionName in self.code.keys():
f.write("\n%s:\n" %functionName)
for i in range(len(self.code[functionName])):
codePoint = self.code[functionName][i]
if codePoint[0] == 'LABEL':
f.write("%s:\n" %codePoint[1])
elif codePoint[1] == '':
f.write("\t%s\n" %codePoint[0])
elif codePoint[2] == '':
f.write("\t%s\t\t%s\n" %(codePoint[0], codePoint[1]))
elif codePoint[3] == '':
f.write("\t%s\t\t%s,\t%s\n" %(codePoint[0], codePoint[1], codePoint[2]))
else:
f.write("\t%s\t\t%s,\t%s,\t%s\n" %(codePoint[0], codePoint[1], codePoint[2], codePoint[3]))
# labels for printing etc
data = open('lib/code.s').read()
f.write(data)
f.close()