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bytecode.py
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204 lines (169 loc) · 6.39 KB
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# alias to keep the 'bytecode' variable free
import sys
import bytecode as _bytecode
from bytecode.instr import UNSET, Label, SetLineno, Instr
from bytecode.flags import infer_flags
class BaseBytecode:
def __init__(self):
self.argcount = 0
if sys.version_info > (3, 8):
self.posonlyargcount = 0
self.kwonlyargcount = 0
self.first_lineno = 1
self.name = "<module>"
self.filename = "<string>"
self.docstring = UNSET
self.cellvars = []
# we cannot recreate freevars from instructions because of super()
# special-case
self.freevars = []
self._flags = _bytecode.CompilerFlags(0)
def _copy_attr_from(self, bytecode):
self.argcount = bytecode.argcount
if sys.version_info > (3, 8):
self.posonlyargcount = bytecode.posonlyargcount
self.kwonlyargcount = bytecode.kwonlyargcount
self.flags = bytecode.flags
self.first_lineno = bytecode.first_lineno
self.name = bytecode.name
self.filename = bytecode.filename
self.docstring = bytecode.docstring
self.cellvars = list(bytecode.cellvars)
self.freevars = list(bytecode.freevars)
def __eq__(self, other):
if type(self) != type(other):
return False
if self.argcount != other.argcount:
return False
if sys.version_info > (3, 8):
if self.posonlyargcount != other.posonlyargcount:
return False
if self.kwonlyargcount != other.kwonlyargcount:
return False
if self.flags != other.flags:
return False
if self.first_lineno != other.first_lineno:
return False
if self.filename != other.filename:
return False
if self.name != other.name:
return False
if self.docstring != other.docstring:
return False
if self.cellvars != other.cellvars:
return False
if self.freevars != other.freevars:
return False
if self.compute_stacksize() != other.compute_stacksize():
return False
return True
@property
def flags(self):
return self._flags
@flags.setter
def flags(self, value):
if not isinstance(value, _bytecode.CompilerFlags):
value = _bytecode.CompilerFlags(value)
self._flags = value
def update_flags(self, *, is_async=None):
self.flags = infer_flags(self, is_async)
class _BaseBytecodeList(BaseBytecode, list):
"""List subclass providing type stable slicing and copying."""
def __getitem__(self, index):
value = super().__getitem__(index)
if isinstance(index, slice):
value = type(self)(value)
value._copy_attr_from(self)
return value
def copy(self):
new = type(self)(super().copy())
new._copy_attr_from(self)
return new
def legalize(self):
"""Check that all the element of the list are valid and remove SetLineno."""
lineno_pos = []
set_lineno = None
current_lineno = self.first_lineno
for pos, instr in enumerate(self):
if isinstance(instr, SetLineno):
set_lineno = instr.lineno
lineno_pos.append(pos)
continue
# Filter out Labels
if not isinstance(instr, Instr):
continue
if set_lineno is not None:
instr.lineno = set_lineno
elif instr.lineno is None:
instr.lineno = current_lineno
else:
current_lineno = instr.lineno
for i in reversed(lineno_pos):
del self[i]
def __iter__(self):
instructions = super().__iter__()
for instr in instructions:
self._check_instr(instr)
yield instr
def _check_instr(self, instr):
raise NotImplementedError()
class _InstrList(list):
def _flat(self):
instructions = []
labels = {}
jumps = []
offset = 0
for index, instr in enumerate(self):
if isinstance(instr, Label):
instructions.append("label_instr%s" % index)
labels[instr] = offset
else:
if isinstance(instr, Instr) and isinstance(instr.arg, Label):
target_label = instr.arg
instr = _bytecode.ConcreteInstr(instr.name, 0, lineno=instr.lineno)
jumps.append((target_label, instr))
instructions.append(instr)
offset += 1
for target_label, instr in jumps:
instr.arg = labels[target_label]
return instructions
def __eq__(self, other):
if not isinstance(other, _InstrList):
other = _InstrList(other)
return self._flat() == other._flat()
class Bytecode(_InstrList, _BaseBytecodeList):
def __init__(self, instructions=()):
BaseBytecode.__init__(self)
self.argnames = []
for instr in instructions:
self._check_instr(instr)
self.extend(instructions)
def __iter__(self):
instructions = super().__iter__()
for instr in instructions:
self._check_instr(instr)
yield instr
def _check_instr(self, instr):
if not isinstance(instr, (Label, SetLineno, Instr)):
raise ValueError(
"Bytecode must only contain Label, "
"SetLineno, and Instr objects, "
"but %s was found" % type(instr).__name__
)
def _copy_attr_from(self, bytecode):
super()._copy_attr_from(bytecode)
if isinstance(bytecode, Bytecode):
self.argnames = bytecode.argnames
@staticmethod
def from_code(code):
concrete = _bytecode.ConcreteBytecode.from_code(code)
return concrete.to_bytecode()
def compute_stacksize(self):
cfg = _bytecode.ControlFlowGraph.from_bytecode(self)
return cfg.compute_stacksize()
def to_code(self, compute_jumps_passes=None, stacksize=None):
bc = self.to_concrete_bytecode(compute_jumps_passes=compute_jumps_passes)
return bc.to_code(stacksize=stacksize)
def to_concrete_bytecode(self, compute_jumps_passes=None):
converter = _bytecode._ConvertBytecodeToConcrete(self)
return converter.to_concrete_bytecode(compute_jumps_passes=compute_jumps_passes)