def _fields(self):
oft = self.offset
cnt = (toint(self.bytes[oft + 0]) << 8) + toint(self.bytes[oft + 1])
self.offset += 2
oft = self.offset
for index in range(cnt):
flags = (toint(self.bytes[oft + 0]) << 8) + toint(
self.bytes[oft + 1])
nameidx = (toint(self.bytes[oft + 2]) << 8) + toint(
self.bytes[oft + 3])
descidx = (toint(self.bytes[oft + 4]) << 8) + toint(
self.bytes[oft + 5])
attrcnt = (toint(self.bytes[oft + 6]) << 8) + toint(
self.bytes[oft + 7])
desc = self.__resolve(descidx)
pytype = PyVMType['A'] if desc.startswith("L") else PyVMType[desc]
pyfield = PyField(self.klass, flags, self.__resolve(nameidx),
nameidx, pytype, descidx)
self.offset += 8
for attrix in range(attrcnt):
attribute = self.__parse_attribute(pyfield)
pyfield.attrs.append(attribute)
self.fields.append(pyfield)
def __parse_attribute(self, item):
oft = self.offset
nameIdx = (toint(self.bytes[oft + 0]) << 8) + toint(
self.bytes[oft + 1])
attrLen = (toint(self.bytes[oft + 2]) << 24) + \
(toint(self.bytes[oft + 3]) << 16) + \
(toint(self.bytes[oft + 4]) << 8) + \
(toint(self.bytes[oft + 5]) << 0)
endIndex = self.offset + attrLen + 6
self.offset += 6
entry = self.pool_items[nameIdx - 1]
if entry.string == "ConstantValue":
if isinstance(entry, PyMethod):
desc = "{}:{}".format(self.__resolve(item.nameidx),
self.__resolve(item.descidx))
raise PyIllegalArgumentException(
"Method {} cannot be constant".format(desc))
# TODO
self.offset += 2
elif entry.string == "Code":
# method expected here, it's code after all :D.
if isinstance(item, PyField):
desc = "{}:{}".format(self.__resolve(item.nameidx),
self.__resolve(item.descidx))
raise PyIllegalArgumentException(
"Field {} cannot contain code".format(desc))
self.offset += 4
oft = self.offset
codeLen = (toint(self.bytes[oft + 0]) << 24) + \
(toint(self.bytes[oft + 1]) << 16) + \
(toint(self.bytes[oft + 2]) << 8) + \
(toint(self.bytes[oft + 3]) << 0)
self.offset += 4
item.bytecode = self.bytes[self.offset:self.offset + codeLen]
elif entry.string == "Exceptions":
print("encountered exception handler in bytecode, skipping!")
else:
raise PyIllegalArgumentException("unhandled attribute type", entry)
self.offset = endIndex
return PyAttr(nameIdx)
def _basic_type_info(self):
oft = self.offset
self.flags = (toint(self.bytes[oft + 0]) << 8) + toint(
self.bytes[oft + 1])
self.klassIdx = (toint(self.bytes[oft + 2]) << 8) + toint(
self.bytes[oft + 3])
self.klass = self.__resolve(self.klassIdx)
self.superIdx = (toint(self.bytes[oft + 4]) << 8) + toint(
self.bytes[oft + 5])
self.super = self.__resolve(self.superIdx)
cnt = (toint(self.bytes[oft + 6]) << 8) + toint(self.bytes[oft + 7])
calc = lambda x: (toint(self.bytes[oft + x + 8]) << 8) + toint(
self.bytes[oft + x + 9])
self.interfaces = [calc(index) for index in range(cnt)]
self.offset += (4 * 2) + (cnt * 2)
def _methods(self):
oft = self.offset
cnt = (toint(self.bytes[oft + 0]) << 8) + toint(self.bytes[oft + 1])
self.offset += 2
for index in range(cnt):
oft = self.offset
flags = (toint(self.bytes[oft + 0]) << 8) + toint(
self.bytes[oft + 1])
nameIdx = (toint(self.bytes[oft + 2]) << 8) + toint(
self.bytes[oft + 3])
descIdx = (toint(self.bytes[oft + 4]) << 8) + toint(
self.bytes[oft + 5])
attrcnt = (toint(self.bytes[oft + 6]) << 8) + toint(
self.bytes[oft + 7])
pymethod = PyMethod(self.klass, flags, nameIdx,
self.__resolve(nameIdx), descIdx,
self.__resolve(descIdx))
self.offset += 8
for attrix in range(attrcnt):
attribute = self.__parse_attribute(pymethod)
pymethod.attrs.append(attribute)
self.methods.append(pymethod)
def _header(self):
bytes = self.bytes[:4]
header = [0xca, 0xfe, 0xba, 0xbe]
for actual, expected in zip(bytes, header):
actual = toint(actual)
if actual != expected:
raise Exception("invalid header. expected:%s found:%s" %
(expected, actual))
self.minor = (toint(self.bytes[4]) << 8) + toint(self.bytes[5])
self.major = (toint(self.bytes[6]) << 8) + toint(self.bytes[7])
self.pool_count = toint(self.bytes[8]) + toint(self.bytes[9])
self.pool_items = []
self.offset += 10
def _constant_pool(self):
for index in range(1, self.pool_count):
entry = toint(self.bytes[self.offset]) & 0xff
kptype = self.kptable[entry]
self.offset += 1
if kptype.type == "UTF8":
length = (toint(self.bytes[self.offset]) << 8) + toint(
self.bytes[self.offset + 1])
bytestr = tostring(self.bytes[self.offset + 2:self.offset + 2 +
length])
self.offset += 2 + length
self.pool_items.append(PyKPEntry(index, kptype, bytestr))
elif kptype.type == "INTEGER":
oft = self.offset
val = (toint(self.bytes[oft + 0]) << 24) \
+ (toint(self.bytes[oft + 1]) << 16) \
+ (toint(self.bytes[oft + 2]) << 8) \
+ (toint(self.bytes[oft + 3]))
self.offset += 4
self.pool_items.append(PyKPEntry(index, kptype, val))
elif kptype.type == "FLOAT":
oft = self.offset
val = (toint(self.bytes[oft + 0]) << 24) \
+ (toint(self.bytes[oft + 1]) << 16) \
+ (toint(self.bytes[oft + 2]) << 8) \
+ (toint(self.bytes[oft + 3]))
# todo: change to float.
self.offset += 4
self.pool_items.append(PyKPEntry(index, kptype, val))
elif kptype.type == "LONG":
oft = self.offset
val1 = (toint(self.bytes[oft + 0]) << 24) \
+ (toint(self.bytes[oft + 1]) << 16) \
+ (toint(self.bytes[oft + 2]) << 8) \
+ (toint(self.bytes[oft + 3]))
val2 = (toint(self.bytes[oft + 4]) << 24) \
+ (toint(self.bytes[oft + 5]) << 16) \
+ (toint(self.bytes[oft + 6]) << 8) \
+ (toint(self.bytes[oft + 7]))
val = (val1 << 32) + val2
# todo: change to long.
self.offset += 8
self.pool_items.append(PyKPEntry(index, kptype, val))
elif kptype.type == "DOUBLE":
oft = self.offset
val1 = (toint(self.bytes[oft + 0]) << 24) \
+ (toint(self.bytes[oft + 1]) << 16) \
+ (toint(self.bytes[oft + 2]) << 8) \
+ (toint(self.bytes[oft + 3]))
val2 = (toint(self.bytes[oft + 4]) << 24) \
+ (toint(self.bytes[oft + 5]) << 16) \
+ (toint(self.bytes[oft + 6]) << 8) \
+ (toint(self.bytes[oft + 7]))
val = (val1 << 32) + val2
# todo: change to long.
self.offset += 8
self.pool_items.append(PyKPEntry(index, kptype, val))
elif kptype.type == "CLASS":
klassRef = (toint(self.bytes[self.offset]) << 8) + toint(
self.bytes[self.offset + 1])
self.offset += 2
self.pool_items.append(
PyKPEntry(index, kptype, ref1=PyRef(klassRef)))
elif kptype.type == "STRING":
strRef = (toint(self.bytes[self.offset]) << 8) + toint(
self.bytes[self.offset + 1])
self.offset += 2
self.pool_items.append(
PyKPEntry(index, kptype, ref1=PyRef(strRef)))
elif kptype.type == "NAMEANDTYPE":
nameRef = (toint(self.bytes[self.offset + 0]) << 8) + toint(
self.bytes[self.offset + 1])
typeRef = (toint(self.bytes[self.offset + 2]) << 8) + toint(
self.bytes[self.offset + 3])
self.offset += 4
self.pool_items.append(
PyKPEntry(index,
kptype,
ref1=PyRef(nameRef),
ref2=PyRef(typeRef)))
elif kptype.type == "FIELDREF" \
or kptype.type == "METHODREF" \
or kptype.type == "INTERFACE_METHODREF":
kpIndex = (toint(self.bytes[self.offset + 0]) << 8) + toint(
self.bytes[self.offset + 1])
ntIndex = (toint(self.bytes[self.offset + 2]) << 8) + toint(
self.bytes[self.offset + 3])
self.offset += 4
self.pool_items.append(
PyKPEntry(index,
kptype,
ref1=PyRef(kpIndex),
ref2=PyRef(ntIndex)))
else:
raise PyKlassNotFoundException("class not found exception")
def execute(
self, method: PyVMMethod,
lvars: IntrptVars = IntrptVars()) -> PyVMValue:
klass = method.klass.name
bytecode = method.bytecode
evalstack = IntrptEvalStack()
description = method.name_type
print(bytecode)
offset = 0
while True:
byte = bytecode[offset]
offset += 1
opcode = self.opcodes[toint(byte) & 0xff]
if not opcode:
message = "invalid opcode:{} found at:{}, stopping.".format(
opcode, byte & 0xff)
raise PyIllegalOpcodeFound(message)
num = opcode.params
print("{} {} {}".format(offset - 1, toint(byte), byte))
if opcode.name == "ACONST_NULL":
print(">> ", opcode.name)
evalstack.aconst_null()
elif opcode.name == "ALOAD":
print(">> ", opcode.name)
index = toint(bytecode[offset])
evalstack.push(lvars.aload(index))
offset += 1
elif opcode.name == "ALOAD_0":
print(">> ", opcode.name)
evalstack.push(lvars.aload(0))
elif opcode.name == "ALOAD_1":
print(">> ", opcode.name)
evalstack.push(lvars.aload(1))
elif opcode.name == "ARETURN":
print(">> ", opcode.name)
evalstack.pop()
elif opcode.name == "ASTORE":
print(">> ", opcode.name)
index = toint(bytecode[offset])
lvars.astore(index, evalstack.pop())
offset += 1
elif opcode.name == "ASTORE_0":
print(">> ", opcode.name)
lvars.astore(0, evalstack.pop())
elif opcode.name == "ASTORE_1":
print(">> ", opcode.name)
lvars.astore(1, evalstack.pop())
elif opcode.name == "BIPUSH":
print(">> ", opcode.name)
evalstack.iconst(toint(bytecode[offset]))
offset += 1
elif opcode.name == "BREAKPOINT":
print(">> ", opcode.name)
elif opcode.name == "DADD":
print(">> ", opcode.name)
print(evalstack)
evalstack.dadd()
elif opcode.name == "DSUB":
print(">> ", opcode.name)
evalstack.dsub()
elif opcode.name == "DMUL":
print(">> ", opcode.name)
evalstack.dmul()
elif opcode.name == "DDIV":
print(">> ", opcode.name)
evalstack.ddiv()
elif opcode.name == "DNEG":
print(">> ", opcode.name)
evalstack.dneg()
elif opcode.name == "DREM":
print(">> ", opcode.name)
evalstack.drem()
elif opcode.name == "DCONST_0":
print(">> ", opcode.name)
evalstack.dconst(0)
elif opcode.name == "DCONST_1":
print(">> ", opcode.name)
evalstack.dconst(1)
elif opcode.name == "DLOAD":
print(">> ", opcode.name)
index = toint(bytecode[offset])
evalstack.push(lvars.dload(index))
offset += 1
elif opcode.name == "DLOAD_0":
print(">> ", opcode.name)
evalstack.push(lvars.dload(0))
elif opcode.name == "DLOAD_1":
print(">> ", opcode.name)
evalstack.push(lvars.dload(1))
elif opcode.name == "DLOAD_2":
print(">> ", opcode.name)
evalstack.push(lvars.dload(2))
elif opcode.name == "DLOAD_3":
print(">> ", opcode.name)
evalstack.push(lvars.dload(3))
elif opcode.name == "DRETURN":
print(">> ", opcode.name)
print(evalstack)
return evalstack.pop()
elif opcode.name == "DSTORE":
print(">> ", opcode.name)
index = toint(bytecode[offset])
lvars.store(index, evalstack.pop())
offset += 1
elif opcode.name == "DSTORE_0":
print(">> ", opcode.name)
lvars.store(0, evalstack.pop())
elif opcode.name == "DSTORE_1":
print(">> ", opcode.name)
lvars.store(1, evalstack.pop())
elif opcode.name == "DSTORE_2":
print(">> ", opcode.name)
lvars.store(2, evalstack.pop())
elif opcode.name == "DSTORE_3":
print(">> ", opcode.name)
lvars.store(3, evalstack.pop())
elif opcode.name == "DUP":
print(">> ", opcode.name)
evalstack.dup()
elif opcode.name == "DUP2":
print(">> ", opcode.name)
evalstack.dup2()
elif opcode.name == "DUP_X1":
print(">> ", opcode.name)
evalstack.dup_x1()
elif opcode.name == "GOTO":
print(">> ", opcode.name)
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump
elif opcode.name == "I2B":
print(">> ", opcode.name)
evalstack.i2b()
elif opcode.name == "I2C":
print(">> ", opcode.name)
evalstack.i2c()
elif opcode.name == "I2D":
print(">> ", opcode.name)
evalstack.i2d()
elif opcode.name == "I2F":
print(">> ", opcode.name)
evalstack.i2f()
elif opcode.name == "I2L":
print(">> ", opcode.name)
evalstack.i2l()
elif opcode.name == "I2S":
print(">> ", opcode.name)
evalstack.i2s()
elif opcode.name == "IADD":
print(">> ", opcode.name)
evalstack.iadd()
elif opcode.name == "IAND":
print(">> ", opcode.name)
evalstack.iand()
elif opcode.name == "ICONST_M1":
print(">> ", opcode.name)
evalstack.iconst(-1)
elif opcode.name == "ICONST_0":
print(">> ", opcode.name)
evalstack.iconst(0)
elif opcode.name == "ICONST_1":
print(">> ", opcode.name)
evalstack.iconst(1)
elif opcode.name == "ICONST_2":
print(">> ", opcode.name)
evalstack.iconst(2)
elif opcode.name == "ICONST_3":
print(">> ", opcode.name)
evalstack.iconst(3)
elif opcode.name == "ICONST_4":
print(">> ", opcode.name)
evalstack.iconst(4)
elif opcode.name == "ICONST_5":
print(">> ", opcode.name)
evalstack.iconst(5)
elif opcode.name == "IDIV":
print(">> ", opcode.name)
evalstack.idiv()
elif opcode.name == "IF_ICMPEQ":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1])
if (val1 == val2): offset += (jump - 1)
offset += 2
elif opcode.name == "IF_ICMPNE":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 != val2) else 2
elif opcode.name == "IF_ICMPLT":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 < val2) else 2
elif opcode.name == "IF_ICMPGE":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 >= val2) else 2
elif opcode.name == "IF_ICMPGT":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 > val2) else 2
elif opcode.name == "IF_ICMPLE":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 <= val2) else 2
elif opcode.name == "IF_ICMPEQ":
print(">> ", opcode.name)
val1 = evalstack.pop()
val2 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if (val1 == val2) else 2
elif opcode.name == "IFEQ":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 == PyVMValue.pyint(0) else 2
elif opcode.name == "IFGE":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 >= PyVMValue.pyint(0) else 2
elif opcode.name == "IFGT":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 > PyVMValue.pyint(0) else 2
elif opcode.name == "IFLE":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 <= PyVMValue.pyint(0) else 2
elif opcode.name == "IFLT":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 < PyVMValue.pyint(0) else 2
elif opcode.name == "IFNE":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 != PyVMValue.pyint(0) else 2
elif opcode.name == "IFNONNULL":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
#TODO: assert for reference type.
offset += jump if val1 != PyVMValue.pyint(0) else 2
elif opcode.name == "IFNULL":
print(">> ", opcode.name)
val1 = evalstack.pop()
jump = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1]) - 1
offset += jump if val1 == PyVMValue.pyint(0) else 2
elif opcode.name == "IINC":
print(">> ", opcode.name)
lvars.iinc(toint(bytecode[offset + 0]),
toint(bytecode[offset + 1]))
offset += 2
elif opcode.name == "ILOAD":
print(">> ", opcode.name)
index = toint(bytecode[offset])
evalstack.push(lvars.iload(index))
offset += 1
elif opcode.name == "ILOAD_0":
print(">> ", opcode.name)
evalstack.push(lvars.iload(0))
elif opcode.name == "ILOAD_1":
print(">> ", opcode.name)
evalstack.push(lvars.iload(1))
elif opcode.name == "ILOAD_2":
print(">> ", opcode.name)
evalstack.push(lvars.iload(2))
elif opcode.name == "ILOAD_3":
print(">> ", opcode.name)
evalstack.push(lvars.iload(3))
elif opcode.name == "IMPDEP1":
print(">> ", opcode.name)
elif opcode.name == "IMPDEP2":
print(">> ", opcode.name)
elif opcode.name == "IMUL":
print(">> ", opcode.name)
evalstack.imul()
elif opcode.name == "INEG":
print(">> ", opcode.name)
evalstack.ineg()
elif opcode.name == "INVOKESPECIAL":
print(">> ", opcode.name, offset)
index = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1])
function = self.repo.lookupMethodExact(klass, index)
self.dispatch_invoke(function, evalstack)
offset += 2
elif opcode.name == "INVOKESTATIC":
print(">> ", opcode.name, offset)
index = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1])
function = self.repo.lookupMethodExact(klass, index)
self.dispatch_invoke(function, evalstack)
offset += 2
elif opcode.name == "INVOKEVIRTUAL":
print(">> ", opcode.name, offset)
index = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1])
function = self.repo.lookupMethodVirtual(klass, index)
self.dispatch_invoke(function, evalstack)
offset += 2
elif opcode.name == "IOR":
print(">> ", opcode.name)
evalstack.ior()
elif opcode.name == "IREM":
print(">> ", opcode.name)
evalstack.irem()
elif opcode.name == "IRETURN":
print(">> ", opcode.name)
print(evalstack)
return evalstack.pop()
elif opcode.name == "ISTORE":
print(">> ", opcode.name)
index = toint(bytecode[offset])
lvars.store(index, evalstack.pop())
offset += 1
elif opcode.name == "ISTORE_0":
print(">> ", opcode.name)
lvars.store(0, evalstack.pop())
elif opcode.name == "ISTORE_1":
print(">> ", opcode.name)
lvars.store(1, evalstack.pop())
elif opcode.name == "ISTORE_2":
print(">> ", opcode.name)
lvars.store(2, evalstack.pop())
elif opcode.name == "ISTORE_3":
print(">> ", opcode.name)
lvars.store(3, evalstack.pop())
elif opcode.name == "ISUB":
print(">> ", opcode.name)
evalstack.isub()
elif opcode.name == "MONITOREXIT":
print(">> ", opcode.name)
#TODO: synchronized section end
evalstack.pop()
elif opcode.name == "MONITORENTER":
print(">> ", opcode.name)
#TODO: synchronized section start
evalstack.pop()
elif opcode.name == "NEW":
print(">> ", opcode.name)
index = (toint(bytecode[offset]) << 8) + toint(
bytecode[offset + 1])
klazz = self.repo.lookupKlass(klass, index)
value = PyVMValue.pyref(self.heap.allocate(klazz))
evalstack.push(value)
elif opcode.name == "JSR":
print(">> ", opcode.name)
pass
elif opcode.name == "JSR_W":
print(">> ", opcode.name)
pass
elif opcode.name == "LDC":
print(">> ", opcode.name)
pass
elif opcode.name == "NOP":
print(">> ", opcode.name)
elif opcode.name == "POP":
print(">> ", opcode.name)
evalstack.pop()
elif opcode.name == "POP2":
print(">> ", opcode.name)
val1 = evalstack.pop()
if (val1.type == PyVMType.D) or (val1.type == PyVMType.J):
continue
evalstack.pop()
elif opcode.name == "GETFIELD":
print(">> ", opcode.name)
index = (toint(bytecode[offset]) << 8) + toint(
bytecode[offset + 1])
field = self.repo.lookupField(klass, index)
receiver = evalstack.pop()
pyobject = self.heap.find(receiver.value)
evalstack.push(pyobject.get_field(field))
offset += 2
elif opcode.name == "PUTFIELD":
print(">> ", opcode.name)
index = (toint(bytecode[offset]) << 8) + toint(
bytecode[offset + 1])
field = self.repo.lookupField(klass, index)
value = evalstack.pop()
receiver = evalstack.pop()
pyobject = self.heap.find(receiver.value)
pyobject.set_field(field, value)
elif opcode.name == "GETSTATIC":
print(">> ", opcode.name)
index = (toint(bytecode[offset]) << 8) + toint(
bytecode[offset + 1])
field = self.repo.lookupField(klass, index)
klazz = field.klass
evalstack.push(klazz.get_static_field(field))
offset += 2
elif opcode.name == "PUTSTATIC":
print(">> ", opcode.name)
index = (toint(bytecode[offset]) << 8) + toint(
bytecode[offset + 1])
field = self.repo.lookupField(klass, index)
value = evalstack.pop()
fklazz = field.klass
fklazz.set_static_field(field.name, value)
elif opcode.name == "RET":
print(">> ", opcode.name)
pass
elif opcode.name == "RETURN":
print(">> ", opcode.name)
return None
elif opcode.name == "SIPUSH":
print(">> ", opcode.name)
val = (toint(bytecode[offset + 0]) << 8) + toint(
bytecode[offset + 1])
evalstack.iconst(val)
elif opcode.name == "SWAP":
print(">> ", opcode.name)
evalstack.swap()
return None