def iter_instructions(self, f):
"""Iterate over instructions.
For each real instruction (not label or comment), call f,
which must return either None or a list of instruction. If it
returns None, nothing happens. If it returns a list, then the
instruction is replaced by this list.
"""
i = 0
while i < len(self._listIns):
old_i = self._listIns[i]
if not old_i.is_instruction():
i += 1
continue
new_i_list = f(old_i)
if new_i_list is None:
i += 1
continue
del self._listIns[i]
self._listIns.insert(i, Comment(str(old_i)))
i += 1
for new_i in new_i_list:
self._listIns.insert(i, new_i)
i += 1
self._listIns.insert(i, Comment("end " + str(old_i)))
i += 1
def addComment(self, s):
self.add_instruction(Comment(s))