def classItselfImplementsSelector(klass, selector):
thisMethod = objc.class_getInstanceMethod(klass, selector)
if thisMethod == 0:
return False
superklass = objc.class_getSuperclass(klass)
superMethod = objc.class_getInstanceMethod(superklass, selector)
if thisMethod == superMethod:
return False
else:
return True
def run(self, arguments, options):
expression = arguments[0]
methodPattern = re.compile(
r"""
(?P<scope>[-+])?
\[
(?P<target>.*?)
(?P<category>\(.+\))?
\s+
(?P<selector>.*)
\]
""",
re.VERBOSE,
)
match = methodPattern.match(expression)
if not match:
print("Failed to parse expression. Do you even Objective-C?!")
return
expressionForSelf = objc.functionPreambleExpressionForSelf()
if not expressionForSelf:
arch = objc.currentArch()
print(
"Your architecture, {}, is truly fantastic. However, I don't currently support it."
.format(arch))
return
methodTypeCharacter = match.group("scope")
classNameOrExpression = match.group("target")
category = match.group("category")
selector = match.group("selector")
methodIsClassMethod = methodTypeCharacter == "+"
if not methodIsClassMethod:
# The default is instance method, and methodTypeCharacter
# may not actually be '-'.
methodTypeCharacter = "-"
targetIsClass = False
targetObject = fb.evaluateObjectExpression(
"({})".format(classNameOrExpression), False)
if not targetObject:
# If the expression didn't yield anything then it's likely a class.
# Assume it is. We will check again that the class does actually
# exist anyway.
targetIsClass = True
targetObject = fb.evaluateObjectExpression(
"[{} class]".format(classNameOrExpression), False)
targetClass = fb.evaluateObjectExpression(
"[{} class]".format(targetObject), False)
if not targetClass or int(targetClass, 0) == 0:
print(
'Couldn\'t find a class from the expression "{}". Did you typo?'
.format(classNameOrExpression))
return
if methodIsClassMethod:
targetClass = objc.object_getClass(targetClass)
found = False
nextClass = targetClass
while not found and int(nextClass, 0) > 0:
if classItselfImplementsSelector(nextClass, selector):
found = True
else:
nextClass = objc.class_getSuperclass(nextClass)
if not found:
print(
"There doesn't seem to be an implementation of {} in the class hierarchy. Made a boo boo with the selector name?"
.format(selector))
return
breakpointClassName = objc.class_getName(nextClass)
formattedCategory = category if category else ""
breakpointFullName = "{}[{}{} {}]".format(methodTypeCharacter,
breakpointClassName,
formattedCategory, selector)
if targetIsClass:
breakpointCondition = "(void*)object_getClass({}) == {}".format(
expressionForSelf, targetClass)
else:
breakpointCondition = "(void*){} == {}".format(
expressionForSelf, targetObject)
print("Setting a breakpoint at {} with condition {}".format(
breakpointFullName, breakpointCondition))
if category:
lldb.debugger.HandleCommand(
'breakpoint set --skip-prologue false --fullname "{}" --condition "{}"'
.format(breakpointFullName, breakpointCondition))
else:
breakpointPattern = r"{}\[{}(\(.+\))? {}\]".format(
methodTypeCharacter, breakpointClassName, selector)
lldb.debugger.HandleCommand(
'breakpoint set --skip-prologue false --func-regex "{}" --condition "{}"'
.format(breakpointPattern, breakpointCondition))