def find_linear_terminator(ea, max_num=256):
"""Find the terminating instruction of a basic block, without actually
associating the instructions with the block. This scans linearly until
we find something that is definitely a basic block terminator. This does
not consider the case of intermediate blocks."""
prev_term = None
for i in xrange(max_num):
term_inst = get_instruction(ea)
if not term_inst:
log.warning(
"Unable to decode linear terminator at {:08x}".format(ea))
term_inst = prev_term
break
prev_term = term_inst
if term_inst.is_block_terminator() or not term_inst.is_valid():
break
ea = term_inst.next_ea
# The next instruction was already processed as part of some other scan.
if program.instruction_is_valid(ea) or instruction_is_referenced(ea):
break
if term_inst:
term_inst.mark_as_terminator()
return term_inst
def find_linear_terminator(ea, max_num=256):
"""Find the terminating instruction of a basic block, without actually
associating the instructions with the block. This scans linearly until
we find something that is definitely a basic block terminator. This does
not consider the case of intermediate blocks."""
prev_term = None
for i in xrange(max_num):
term_inst = get_instruction(ea)
if not term_inst:
log.warning("Unable to decode linear terminator at {:08x}".format(ea))
term_inst = prev_term
break
prev_term = term_inst
if term_inst.is_block_terminator() or not term_inst.is_valid():
break
ea = term_inst.next_ea
# The next instruction was already processed as part of some other scan.
if program.instruction_is_valid(ea) or instruction_is_referenced(ea):
break
if term_inst:
term_inst.mark_as_terminator()
return term_inst
def get_instruction(ea):
"""Gets the instruction located at `ea`. If we haven't initialized an
`Instruction` data structure for the instruction at `ea`, then we decode
the instruction and fill in the missing data."""
if program.has_instruction(ea):
return program.get_instruction(ea)
if program.instruction_is_valid(ea):
return None
decoded_inst, decoded_bytes = decode_instruction(ea)
if not decoded_inst:
log.error("Unable to decode instruction at {:08x}".format(ea))
return None
inst = program.get_instruction(ea)
if inst.is_valid():
return inst
inst.bytes = "".join(decoded_bytes)
inst.personality = get_instruction_personality(decoded_inst)
return inst
def get_instruction(ea):
"""Gets the instruction located at `ea`. If we haven't initialized an
`Instruction` data structure for the instruction at `ea`, then we decode
the instruction and fill in the missing data."""
if program.has_instruction(ea):
return program.get_instruction(ea)
if program.instruction_is_valid(ea):
return None
decoded_inst, decoded_bytes = decode_instruction(ea)
if not decoded_inst:
log.error("Unable to decode instruction at {:08x}".format(ea))
return None
inst = program.get_instruction(ea)
if inst.is_valid():
return inst
inst.bytes = "".join(decoded_bytes)
inst.personality = get_instruction_personality(decoded_inst)
return inst
