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Aijaz Ansari

This document discusses using the jq command line tool and Python to filter and format JSON data within Xcode's debugger LLDB. It describes running jq filters on JSON strings extracted from variables, saving the filter and JSON to temporary files for jq to process instead of using stdin. A Python function is defined to run jq from LLDB and return the output.

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Advanced Debugging With XCode Extending LLDB Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Aijaz @_aijaz_
360|iDev
(Since 1982) 😱
Debug
Sample Project
360|iDev
360|iDev
Session id: String title: String? sessionDescription: String? startTime: Date endTime: Date speaker: Speaker? startDate: String init?(withId id: String) Speaker id: String name: String imagePath: String? bio: String? twitterHandle: String? website: String? sessions: [Session] init?(withId id: String) speaker sessions
Demo 1
Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
Let’s Recap
# In ~/.lldbinit, available to all LLDB sessions type summary add --summary-string "(${var._indexes[0]}, ${var._indexes[1]})" IndexPath type summary add --summary-string "${var.title} by ${var.speaker.name}" MyConf.Session Quick & Dirty Type Summaries
Summaries in Python
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format () sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
#!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
command script import …/sessionFormatter.py # Add things here, like type summaries, breakpoints # Even execute Swift or Objective-C code with 'expr' .lldbinit-MyConf
Project-Specific Loading in main() or application(_:didFinishLaunchingWithOptions:)
Any Questions?
{ "version": 1, "speakers": [ {"id": 3, "img": “chad.jpg", "name": “Chad Perk", "twitter": "chad", "blog": “www.example.com/chad”, "bio": "Chad is the co-author of…” },
jq
http://feelgrafix.com/data_images/out/28/973590-avatar-the-last-airbender.jpg
$ cat avatar.json [{"name":"Aang","sex":"M","born":-12,"died":153,"bending":["Air","Water","Earth","Fire","Energy"],"identity": {"nationality":"Southern Air Temple","ethnicity":"Air Nomad"},"spouse":"Katara","children":[{"sex":"M","name":"Bumi"}, {"sex":"F","name":"Kya"},{"sex":"M","name":"Tenzin"}]},{"name":"Katara","sex":"F","born":85,"died":null,"bending": ["Water","Blood"],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe"},"spouse":"Aang","children": [{"sex":"M","name":"Bumi"},{"sex":"F","name":"Kya"},{"sex":"M","name":"Tenzin"}]},{"name":"Sokka","sex":"M","born":84,"died": 164,"bending":[],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe"},"spouse":null,"children":[]}, {"name":"Toph Beifong","sex":"F","born":88,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Gaoling, Earth Kingdom","ethnicity":"Earth Kingdom"},"spouse":null,"children":[{"sex":"F","name":"Lin Beifong"},{"sex":"F","name":"Suyin Beifong"}]},{"name":"Iroh","sex":"M","born":null,"died":null,"bending":["Fire","Energy"],"identity":{"nationality":"Fire Nation Capital, Fire Nation","ethnicity":"Fire Nation"},"spouse":null,"children":[{"sex":"M","name":"Lu Ten"}]}, {"name":"Zuko","sex":"M","born":83,"died":null,"bending":["Fire","Energy"],"identity":{"nationality":"Fire Nation Capital, Fire Nation","ethnicity":"Fire Nation"},"spouse":null,"children":[{"sex":"F","name":"Izumi"}]}, {"name":"Kya","sex":"F","born":null,"died":null,"bending":["Water"],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children":[]}, {"name":"Bumi","sex":"M","born":null,"died":null,"bending":["Air"],"identity":{"nationality":"United Republic","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children":[]},{"name":"Tenzin","sex":"M","born":null,"died":null,"bending":["Air"],"identity": {"nationality":"Republic City, United Republic","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children": [{"sex":"F","name":"Jinora"},{"sex":"F","name":"Ikki"},{"sex":"M","name":"Meelo"},{"sex":"M","name":"Rohan"}]},{"name":"Lin Beifong","sex":"F","born":120,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Republic City, United Republic","ethnicity":"Earth Kingdom"},"spouse":null,"children":[]},{"name":"Suyin Beifong","sex":"F","born": 126,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Republic City, United Republic","ethnicity":"Earth Kingdom"},"spouse":null,"children":[{"sex":"M","name":"Bataar Jr."},{"sex":"F","name":"Opal"},{"sex":"M","name":"Wei"}, {"sex":"M","name":"Wing"},{"sex":"M","name":"Huan"}]}] $
# Pretty print the jq $ jq '.' avatar.json command input filefilter
# Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $
# Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $ # The ']' on the last line tells me this is an array
# Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $ # The ']' on the last line tells me this is an array # The '}' on the 2nd-last line tells me this is an array of objects
# List the keys of each object $ jq ' .[] | keys ' avatar.json foreach item in array print the keys of each object pipe the output of one filter into the input of the next
# List the keys of each object $ jq ' .[] | keys ' avatar.json [ "bending", "born", "children", "died", "identity", "name", "sex", "spouse" ] [ "bending", "born",… $
# The name of each character $ jq ' .[] | .name ' avatar.json foreach item in array extract the ‘name’ field
# The name of each character $ jq ‘.[] | .name’ avatar.json "Aang" "Katara" "Sokka" "Toph Beifong" "Iroh" "Zuko" "Kya" "Bumi" "Tenzin" "Lin Beifong" $
# The name of each female character $ jq ' .[] | select(.sex == "F") | .name ' avatar.json foreach item in array extract the ‘name’ field where sex is F
# The name of each female character $ jq ' .[] | select(.sex == "F") | .name ' avatar.json "Katara" "Toph Beifong" "Kya" "Lin Beifong" "Suyin Beifong” $
Demo 2
Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
(lldb) jq ‘.speakers[]|keys’ jsonString jq filter (program) String 1. Gather input 2. Run the jq filter on the string, saving the output 3. Print the output
#!/usr/bin/python import commands import lldb import shlex
#!/usr/bin/python import commands import lldb import shlex # The actual python function that is bound to the lldb command. def jq_command(debugger, command, result, dict):
def jq_command(debugger, command, result, dict):
def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget()
def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess()
def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess() thread = process.GetSelectedThread()
def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess() thread = process.GetSelectedThread() frame = thread.GetSelectedFrame()
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command)
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command)
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0]
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription())
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq"
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter"
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = “/tmp/jq_json"
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close()
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close()
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) )
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output Gather Input Run Command Print Output
def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output def __lldb_init_module(debugger, dict): # Add any commands contained in this module to LLDB command = 'command script add -f jq.jq_command jq' debugger.HandleCommand(command)
What have we learned?
Validate your hypothesis
(if you’re lucky enough to have a hypothesis.)
Observe
Analyze
Extend
Any Questions?
https://github.com/aijaz/lldbPythonScripts http://aijaz.net/2017/01/11/lldb-python/index.html https://github.com/facebook/chisel
LLDB: https://lldb.llvm.org/ A blog post from January, where I write about most of the same stuff: Extending LLDB: http://aijaz.net/2017/01/11/lldb-python/index.html JQ jq: https://stedolan.github.io/jq/ A Facebook library that adds a lot of cool extensions to LLDB Facebook Chisel: https://github.com/facebook/chisel WWDC Sessions: Debugging Tips and Tricks https://developer.apple.com/videos/play/wwdc2016/417/ What’s new in LLDB: https://developer.apple.com/videos/play/wwdc2015/402/ Introduction to LLDB and the Swift REPL https://developer.apple.com/videos/play/wwdc2014/409/ Advanced Swift Debugging in LLDB https://developer.apple.com/videos/play/wwdc2014/410/ Debugging in Xcode 6 https://developer.apple.com/videos/play/wwdc2014/413/ Debugging with Xcode https://developer.apple.com/videos/play/wwdc2013/407/ * Advanced Debugging with LLDB https://developer.apple.com/videos/play/wwdc2013/413/ * Debugging in Xcode https://developer.apple.com/videos/play/wwdc2012/412/ * Debugging with Xcode https://developer.apple.com/videos/play/wwdc2012/415/ *: Contains material related to this talk
Thank You! https://www.theodysseyonline.com/overthinking-spongebob @_aijaz_

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360|iDev

  • 1. Advanced Debugging With XCode Extending LLDB Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • 9. Session id: String title: String? sessionDescription: String? startTime: Date endTime: Date speaker: Speaker? startDate: String init?(withId id: String) Speaker id: String name: String imagePath: String? bio: String? twitterHandle: String? website: String? sessions: [Session] init?(withId id: String) speaker sessions
  • 11. Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • 13. # In ~/.lldbinit, available to all LLDB sessions type summary add --summary-string "(${var._indexes[0]}, ${var._indexes[1]})" IndexPath type summary add --summary-string "${var.title} by ${var.speaker.name}" MyConf.Session Quick & Dirty Type Summaries
  • 15. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') sessionFormatter.py
  • 16. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str sessionFormatter.py
  • 17. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str sessionFormatter.py
  • 18. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format () sessionFormatter.py
  • 19. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): sessionFormatter.py
  • 20. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) sessionFormatter.py
  • 21. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) sessionFormatter.py
  • 22. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
  • 23. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
  • 24. #!/usr/bin/python import re regex = re.compile('[^"]*"(.*)"n$') def stripQuotes(str): """Utility method to strip the first and last quote and anything outside them""" match = regex.match(str) if match : return match.group(1) return str def format (valobj,internal_dict): title = valobj.GetChildMemberWithName('title') name = valobj.GetChildMemberWithName(‘speaker’) .GetChildMemberWithName('name') return stripQuotes(title.GetObjectDescription()) + " by " + stripQuotes(name.GetObjectDescription()) def __lldb_init_module(debugger, dict): command = 'type summary add —-python-function sessionFormatter.format MyConf.Session' debugger.HandleCommand(command) sessionFormatter.py
  • 25. command script import …/sessionFormatter.py # Add things here, like type summaries, breakpoints # Even execute Swift or Objective-C code with 'expr' .lldbinit-MyConf
  • 26. Project-Specific Loading in main() or application(_:didFinishLaunchingWithOptions:)
  • 28. { "version": 1, "speakers": [ {"id": 3, "img": “chad.jpg", "name": “Chad Perk", "twitter": "chad", "blog": “www.example.com/chad”, "bio": "Chad is the co-author of…” },
  • 29. jq
  • 31. $ cat avatar.json [{"name":"Aang","sex":"M","born":-12,"died":153,"bending":["Air","Water","Earth","Fire","Energy"],"identity": {"nationality":"Southern Air Temple","ethnicity":"Air Nomad"},"spouse":"Katara","children":[{"sex":"M","name":"Bumi"}, {"sex":"F","name":"Kya"},{"sex":"M","name":"Tenzin"}]},{"name":"Katara","sex":"F","born":85,"died":null,"bending": ["Water","Blood"],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe"},"spouse":"Aang","children": [{"sex":"M","name":"Bumi"},{"sex":"F","name":"Kya"},{"sex":"M","name":"Tenzin"}]},{"name":"Sokka","sex":"M","born":84,"died": 164,"bending":[],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe"},"spouse":null,"children":[]}, {"name":"Toph Beifong","sex":"F","born":88,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Gaoling, Earth Kingdom","ethnicity":"Earth Kingdom"},"spouse":null,"children":[{"sex":"F","name":"Lin Beifong"},{"sex":"F","name":"Suyin Beifong"}]},{"name":"Iroh","sex":"M","born":null,"died":null,"bending":["Fire","Energy"],"identity":{"nationality":"Fire Nation Capital, Fire Nation","ethnicity":"Fire Nation"},"spouse":null,"children":[{"sex":"M","name":"Lu Ten"}]}, {"name":"Zuko","sex":"M","born":83,"died":null,"bending":["Fire","Energy"],"identity":{"nationality":"Fire Nation Capital, Fire Nation","ethnicity":"Fire Nation"},"spouse":null,"children":[{"sex":"F","name":"Izumi"}]}, {"name":"Kya","sex":"F","born":null,"died":null,"bending":["Water"],"identity":{"nationality":"Southern Water Tribe","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children":[]}, {"name":"Bumi","sex":"M","born":null,"died":null,"bending":["Air"],"identity":{"nationality":"United Republic","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children":[]},{"name":"Tenzin","sex":"M","born":null,"died":null,"bending":["Air"],"identity": {"nationality":"Republic City, United Republic","ethnicity":"Water Tribe, Air Nomad"},"spouse":null,"children": [{"sex":"F","name":"Jinora"},{"sex":"F","name":"Ikki"},{"sex":"M","name":"Meelo"},{"sex":"M","name":"Rohan"}]},{"name":"Lin Beifong","sex":"F","born":120,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Republic City, United Republic","ethnicity":"Earth Kingdom"},"spouse":null,"children":[]},{"name":"Suyin Beifong","sex":"F","born": 126,"died":null,"bending":["Earth","Metal"],"identity":{"nationality":"Republic City, United Republic","ethnicity":"Earth Kingdom"},"spouse":null,"children":[{"sex":"M","name":"Bataar Jr."},{"sex":"F","name":"Opal"},{"sex":"M","name":"Wei"}, {"sex":"M","name":"Wing"},{"sex":"M","name":"Huan"}]}] $
  • 32. # Pretty print the jq $ jq '.' avatar.json command input filefilter
  • 33. # Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $
  • 34. # Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $ # The ']' on the last line tells me this is an array
  • 35. # Pretty print the jq $ jq '.' avatar.json ... { "sex": "M", "name": "Huan" } ] } ] $ # The ']' on the last line tells me this is an array # The '}' on the 2nd-last line tells me this is an array of objects
  • 36. # List the keys of each object $ jq ' .[] | keys ' avatar.json foreach item in array print the keys of each object pipe the output of one filter into the input of the next
  • 37. # List the keys of each object $ jq ' .[] | keys ' avatar.json [ "bending", "born", "children", "died", "identity", "name", "sex", "spouse" ] [ "bending", "born",… $
  • 38. # The name of each character $ jq ' .[] | .name ' avatar.json foreach item in array extract the ‘name’ field
  • 39. # The name of each character $ jq ‘.[] | .name’ avatar.json "Aang" "Katara" "Sokka" "Toph Beifong" "Iroh" "Zuko" "Kya" "Bumi" "Tenzin" "Lin Beifong" $
  • 40. # The name of each female character $ jq ' .[] | select(.sex == "F") | .name ' avatar.json foreach item in array extract the ‘name’ field where sex is F
  • 41. # The name of each female character $ jq ' .[] | select(.sex == "F") | .name ' avatar.json "Katara" "Toph Beifong" "Kya" "Lin Beifong" "Suyin Beifong” $
  • 43. Image by Aijaz Ansari. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
  • 44. (lldb) jq ‘.speakers[]|keys’ jsonString jq filter (program) String 1. Gather input 2. Run the jq filter on the string, saving the output 3. Print the output
  • 46. #!/usr/bin/python import commands import lldb import shlex # The actual python function that is bound to the lldb command. def jq_command(debugger, command, result, dict):
  • 48. def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget()
  • 49. def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess()
  • 50. def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess() thread = process.GetSelectedThread()
  • 51. def jq_command(debugger, command, result, dict): target = debugger.GetSelectedTarget() process = target.GetProcess() thread = process.GetSelectedThread() frame = thread.GetSelectedFrame()
  • 52. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame()
  • 53. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command)
  • 54. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command)
  • 55. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0]
  • 56. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable
  • 57. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription())
  • 58. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq"
  • 59. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter"
  • 60. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>" command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = “/tmp/jq_json"
  • 61. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close()
  • 62. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close()
  • 63. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) )
  • 64. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output
  • 65. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output Gather Input Run Command Print Output
  • 66. def jq_command(debugger, command, result, dict): frame = debugger.GetSelectedTarget().GetProcess().GetSelectedThread().GetSelectedFrame() # The command is called like "jq <filter> <stringVar>” command_args = shlex.split(command) jq_filter = command_args[0] val = frame.var(command_args[1]) # access the variable val_string = eval(val.GetObjectDescription()) # path to the jq executable. jq_exe = "/Users/aijaz/local/bin/jq" # We save the filter to a file so that we don’t have to worry about escaping special characters. jq_filter_file = "/tmp/jq_filter" # the value of the NSString variable is saved in this file jq will be invoked on the file, not using stdin jq_json_file = "/tmp/jq_json" # write the json file and jq filter to temp files f = open(jq_json_file, 'w') f.write(val_string) f.close() f = open(jq_filter_file, 'w') f.write(jq_filter) f.close() # invoke jq and capture the output output = commands.getoutput("%s -f %s %s" % ( jq_exe, jq_filter_file, jq_json_file) ) print >>result, output def __lldb_init_module(debugger, dict): # Add any commands contained in this module to LLDB command = 'command script add -f jq.jq_command jq' debugger.HandleCommand(command)
  • 69. (if you’re lucky enough to have a hypothesis.)
  • 75. LLDB: https://lldb.llvm.org/ A blog post from January, where I write about most of the same stuff: Extending LLDB: http://aijaz.net/2017/01/11/lldb-python/index.html JQ jq: https://stedolan.github.io/jq/ A Facebook library that adds a lot of cool extensions to LLDB Facebook Chisel: https://github.com/facebook/chisel WWDC Sessions: Debugging Tips and Tricks https://developer.apple.com/videos/play/wwdc2016/417/ What’s new in LLDB: https://developer.apple.com/videos/play/wwdc2015/402/ Introduction to LLDB and the Swift REPL https://developer.apple.com/videos/play/wwdc2014/409/ Advanced Swift Debugging in LLDB https://developer.apple.com/videos/play/wwdc2014/410/ Debugging in Xcode 6 https://developer.apple.com/videos/play/wwdc2014/413/ Debugging with Xcode https://developer.apple.com/videos/play/wwdc2013/407/ * Advanced Debugging with LLDB https://developer.apple.com/videos/play/wwdc2013/413/ * Debugging in Xcode https://developer.apple.com/videos/play/wwdc2012/412/ * Debugging with Xcode https://developer.apple.com/videos/play/wwdc2012/415/ *: Contains material related to this talk