Add enable&disable breakpoints by rg-expression. #230

sunbohong · 2018-02-23T12:19:50Z

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kastiglione

Thanks for the contribution, this is a cool command.

kastiglione · 2018-02-26T18:23:19Z

commands/FBDebugCommands.py

+
+  br_list = listStr.splitlines()
+  expression_pattern = re.compile(r'{}'.format(expression),re.I)
+  id_pattern = re.compile(r'^\s*([1-9]\d*)(\.\d+)?',re.I)


What do you think about using the Python API, instead of parsing the output of breakpoint list?

For example, it would roughly look like:

for breakpoint in target.breakpoint_iter(): for location in breakpoint: if pattern.search(location.GetAddress().symbol.name): location.SetEnabled(False)

target = lldb.debugger.GetSelectedTarget() for breakpoint in target.breakpoint_iter(): for location in breakpoint: if expression_pattern.search('{}'.format(location)): location.SetEnabled(on)

What do you think about using location?
They have some different.

location 2.1: where = SunLigth`__66+[SUNNetService httpAsyncPostWithDictionary:completionBlock:]_block_invoke + 1984 at SUNNetService.m:37, address = 0x0000000104514dfc, unresolved, hit count = 0 Options: disabled address SunLigth`__66+[SUNNetService httpAsyncPostWithDictionary:completionBlock:]_block_invoke + 1984 at SUNNetService.m:37 symbol id = {0x00006db1}, range = [0x00000001001e063c-0x00000001001e0ec8), mangled="__66+[SUNNetService httpAsyncPostWithDictionary:completionBlock:]_block_invoke" name __66+[SUNNetService httpAsyncPostWithDictionary:completionBlock:]_block_invoke

So that,we can use benable disabled to switch all breakpoints to enable,and also as follow

#use `benable disabled` to switch all breakpoints to `enable` benable disabled * benable ***address*** benable 0x0000000104514dfc * benable ***filename*** benable SUNNetService.m * benable ***module*** benable UIKit benable SunLigth

Enabling/disabling via filename and module definitely seem useful!

kastiglione · 2018-02-26T18:26:19Z

commands/FBDebugCommands.py

+    return 'benable'
+
+  def description(self):
+    return "Enable a set of breakpoints for a relative expression"


typo: should be "regular", not "relative"

kastiglione · 2018-02-26T18:26:21Z

commands/FBDebugCommands.py

+
+class FBMethodBreakpointEnableCommand(fb.FBCommand):
+  def name(self):
+    return 'benable'


lldb has an alias command named rb for regex breakpoint. I think it makes sense to call this rbenable and rbdisable, what do you think?

kastiglione · 2018-02-28T21:53:26Z

commands/FBDebugCommands.py

@@ -189,6 +191,86 @@ def run(self, arguments, options):
    fb.evaluateEffect('[[UIApplication sharedApplication] performSelector:@selector(_performMemoryWarning)]')


+def switchBreakpointState(expression,on):
+  ci = lldb.debugger.GetCommandInterpreter()
+  res = lldb.SBCommandReturnObject()


These two lines are no longer used.

kastiglione · 2018-02-28T21:53:50Z

commands/FBDebugCommands.py

+  ci = lldb.debugger.GetCommandInterpreter()
+  res = lldb.SBCommandReturnObject()
+
+  expression_pattern = re.compile(r'{}'.format(expression),re.I)


This can be re.compile(expression, re.I)

kastiglione · 2018-02-28T21:55:37Z

commands/FBDebugCommands.py

+  target = lldb.debugger.GetSelectedTarget()
+  for breakpoint in target.breakpoint_iter():
+    for location in breakpoint:
+      if expression_pattern.search('{}'.format(location)):


This also doesn't need the format, I think it can be just .search(str(location)).

kastiglione · 2018-02-28T21:55:55Z

commands/FBDebugCommands.py

+  for breakpoint in target.breakpoint_iter():
+    for location in breakpoint:
+      if expression_pattern.search('{}'.format(location)):
+        print location


Nice addition 👍

kastiglione · 2018-02-28T21:57:02Z

commands/FBDebugCommands.py

+
+          #use `rbenable ***module(AppName)***` to switch all breakpoints in this module to `enable`
+          benable UIKit
+          benable Foundation 


This documentation block uses benable where it should be rbenable.

kastiglione · 2018-02-28T21:58:23Z

commands/FBDebugCommands.py

+    Examples:
+
+          #use `rbenable disabled` to switch all breakpoints to `enable`
+          benable disabled


This doesn't appear to be implemented. I don't think it's necessary to implement, since br dis (breakpoint disable) does this already.

since br dis (breakpoint disable)has already this.
Should we use location.GetAddress() to search?

location 57.1: where = libsystem_kernel.dylib`mach_msg_trap + 4, address = 0x00000001832ef564, resolved, hit count = 0 address libsystem_kernel.dylib`mach_msg_trap + 4 symbol id = {0x0000024e}, range = [0x000000018095b560-0x000000018095b56c), name="mach_msg_trap" name mach_msg_trap

when i set breakpoint at this address(0x0000024e),only symbol contain 0x0000024e.
So i want search address and symbol.How do you think?

What does id = {0x0000024e} represent? The address of the breakpoint is in the location: address = 0x00000001832ef564.

i am sorry.i mean that i want search 0x1832ef564 ,not 0x00000001832ef564

Do you mean you want rbdisable 0x1832ef564 to disable the breakpoint whose address is 0x00000001832ef564?

Maybe add special cased input handling. If the user's input expression matches 0x[[:xdigit:]], then when building the regex, add a 0* after the 0x. So 0x1832ef564 would become 0x0*1832ef564.

kastiglione · 2018-02-28T22:00:06Z

@sunbohong I have just a few more small comments. Once those are resolved, I will merge this pull request. Thanks again.

kastiglione · 2018-03-02T17:46:38Z

@sunbohong after thinking about it a little bit, I think benable and bdisable are good names for these commands. Disabling by address isn't really a regular expression, and I have an idea or two for extensions to this command, which are also not for regular expressions. One command I've built for myself in the past is to disable the current breakpoint when stopped, and I think bdisable is a good place to add that functionality.

kastiglione · 2018-03-06T13:30:21Z

commands/FBDebugCommands.py

+    Examples:
+
+          #use `benable disabled` to switch all breakpoints to `enable`
+          benable disabled


I don't think this should be documented. A builtin command already does this: breakpoint enable (or br en for short).

kastiglione · 2018-03-06T13:31:11Z

commands/FBDebugCommands.py

+    Examples:
+
+          #use `bdisable disabled` to switch all breakpoints to `disable`
+          bdisable disabled


Likewise, this is builtin.

ok,i will remove it

kastiglione · 2018-03-06T18:17:39Z

commands/FBDebugCommands.py

+  for breakpoint in target.breakpoint_iter():
+    if breakpoint.IsEnabled() != on and (expression_pattern.search(str(breakpoint))):
+      print str(breakpoint)
+      breakpoint.SetEnabled(on)      


Did you find this was necessary in your experience? I'm curious what are some example cases where these commands need to apply to the breakpoint itself instead of working only on the locations.

If we use br disable 41 to off 41,and benable 41 only enable locations's state.
The 41 41.1 will be ignore.

kastiglione · 2018-03-07T07:06:41Z

Thanks @sunbohong!

Add enable&disable breakpoints by rg-expression.

a21a3ca

facebook-github-bot added the CLA Signed label Feb 23, 2018

kastiglione reviewed Feb 26, 2018

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sunbohong added 2 commits February 28, 2018 14:26

Update rbdisable & rbenable

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Update rbdisable & rbenable

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kastiglione reviewed Feb 28, 2018

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Update rbdisable & rbenable

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kastiglione self-assigned this Mar 2, 2018

sunbohong added 2 commits March 6, 2018 17:52

Update rbdisable & rbenable

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Update bdisable&benable

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kastiglione reviewed Mar 6, 2018

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Update FBDebugCommands.py

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kastiglione reviewed Mar 6, 2018

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kastiglione merged commit 89297aa into facebook:master Mar 7, 2018

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Add enable&disable breakpoints by rg-expression. #230

Add enable&disable breakpoints by rg-expression. #230

sunbohong commented Feb 23, 2018

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kastiglione commented Mar 7, 2018

Add enable&disable breakpoints by rg-expression. #230

Add enable&disable breakpoints by rg-expression. #230

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