Stop debugger by loosely matching a stack frame

stackpoint.py

import lldb
"""
NOTE:
LLDB print adds a bunch of other stuff to the string like in this example
(lldb) script
-- ENTERED PYTHON REPL
>>> print lldb.frame.GetDisplayFunctionName()
::-[ASLayoutTransition applySubnodeInsertionsAndMoves]()
"""

"""
REMEMBER: This is the FILO callstack. It should match the same visual order
that you see in the debugger.
"""
matchingCallStack = [
'-[_ASDisplayLayer layoutSublayers]'
]
initializedParams = False
def stop_matching_stack(debugger, command, result, internal_dict):
    global matchingCallStack
    global initializedParams
    if not initializedParams:
        debugger.HandleCommand('expr BOOL $matchedStack = 0x0')
    target = debugger.GetSelectedTarget()
    process = target.GetProcess()
    thread = process.GetSelectedThread()
    callStack = [frame.GetFunctionName() for frame in thread.frames]
    print callStack
    matchingCallStackCopy = list(matchingCallStack)
    matchedSignatures = 0
    for signature in callStack:
        found = False
        for requirement in matchingCallStackCopy:
            if requirement in signature:
                found = True
                break
        if found:
            matchingCallStackCopy = matchingCallStackCopy[1:]
            matchedSignatures = matchedSignatures + 1
    if matchedSignatures == len(matchingCallStack):
        print "Stack Matcher: Matched Stack!"
        debugger.HandleCommand('expr $matchedStack = 0x1')
        return True
    elif matchedSignatures > 0:
        print "Stack Matcher: Partial Match: " + str(matchedSignatures)
    print process
    debugger.HandleCommand('expr $matchedStack = 0x0')

def __lldb_init_module(debugger, internal_dict):
    debugger.HandleCommand('command script add -f stackpoint.stop_matching_stack stop_matching_stack')
    print 'The "stop_matching_stack" python command has been installed and is ready for use.'