小笨狼与LLDB的故事

小笨狼与LLDB的故事

LLDB基础知识

LLDB控制台

LLDB语法

<command> [<subcommand> [<subcommand>...]] <action> [-options [option-value]] [argument [argument...]]

<command>

<subcommand>

<action>

<options>

<arguement>

[]

breakpoint set -n main

command

breakpoint

action

set

option

-n

arguement

mian

原始(raw)命令

--

expression

expression

(lldb) expression count
(int) $2 = 4

-O

--

(lldb) expression -O -- self
<ViewController: 0x7f9000f17660>

唯一匹配原则

breakpoint set -n main
br s -n main

~/.lldbinit

~/.lldbinit

~/.lldbinit

LLDB命令

expression

expression <cmd-options> -- <expr>

<cmd-options>

--

--

<expr>

expression

expression

// 改变颜色
(lldb) expression -- self.view.backgroundColor = [UIColor redColor]
// 刷新界面
(lldb) expression -- (void)[CATransaction flush]

expression

(lldb) expression -- self.view
(UIView *) $1 = 0x00007fe322c18a10

p & print & call

p

print

call

expression
--

--

原始(raw）命令

print

p

print

call

p

call

(lldb) expression -- self.view
(UIView *) $5 = 0x00007fb2a40344a0
(lldb) p self.view
(UIView *) $6 = 0x00007fb2a40344a0
(lldb) print self.view
(UIView *) $7 = 0x00007fb2a40344a0
(lldb) call self.view
(UIView *) $8 = 0x00007fb2a40344a0
(lldb) e self.view
(UIView *) $9 = 0x00007fb2a40344a0

e

expression

e

po

-O

expression
-O --

po

(lldb) expression -- self.view
(UIView *) $13 = 0x00007fb2a40344a0
(lldb) expression -O -- self.view
<UIView: 0x7fb2a40344a0; frame = (0 0; 375 667); autoresize = W+H; layer = <CALayer: 0x7fb2a4018c80>>
(lldb) po self.view
<UIView: 0x7fb2a40344a0; frame = (0 0; 375 667); autoresize = W+H; layer = <CALayer: 0x7fb2a4018c80>>

help
expression

thread

thread backtrace

& bt

thread backtrace

thread backtrace

thread backtrace [-c <count>] [-s <frame-index>] [-e <boolean>]

thread backtrace

-c

-s

-e

thread backtrace

(lldb) thread backtrace
* thread #1: tid = 0xdd42, 0x000000010afb380b libobjc.A.dylib`objc_msgSend + 11, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=EXC_I386_GPFLT)
frame #0: 0x000000010afb380b libobjc.A.dylib`objc_msgSend + 11
* frame #1: 0x000000010aa9f75e TLLDB`-[ViewController viewDidLoad](self=0x00007fa270e1f440, _cmd="viewDidLoad") + 174 at ViewController.m:23
frame #2: 0x000000010ba67f98 UIKit`-[UIViewController loadViewIfRequired] + 1198
frame #3: 0x000000010ba682e7 UIKit`-[UIViewController view] + 27
frame #4: 0x000000010b93eab0 UIKit`-[UIWindow addRootViewControllerViewIfPossible] + 61
frame #5: 0x000000010b93f199 UIKit`-[UIWindow _setHidden:forced:] + 282
frame #6: 0x000000010b950c2e UIKit`-[UIWindow makeKeyAndVisible] + 42

-[ViewController viewDidLoad]

bt

thread
backtrace

bt

(lldb) bt

thread return

thread
return

thread return [<expr>]

thread return

someMethod

(lldb) thread return NO

return NO;

c & n & s & finish

c

continue

thread
continue

n

next

thread
step-over

s

step

thread
step-in

finish

step-out

thread其他不常用的命令

help thread

thread jump

thread list

thread select

thread until

thread info

frame

bt

frame variable

frame variable

(lldb) frame variable
(ViewController *) self = 0x00007fa158526e60
(SEL) _cmd = "text:"
(BOOL) ret = YES
(int) a = 3

self

_cmd

ret

a

frame variable

(lldb) frame variable self->_string
(NSString *) self->_string = nil

frame variable

frame
variable self.string

self.string

string

getter

p

po

其他不常用命令

frame variable

frame info

(lldb) frame info
frame #0: 0x0000000101bf87d5 TLLDB`-[ViewController text:](self=0x00007fa158526e60, _cmd="text:", ret=YES) + 37 at ViewController.m:38

frame select

(lldb) frame select 1
frame #1: 0x0000000101bf872e TLLDB`-[ViewController viewDidLoad](self=0x00007fa158526e60, _cmd="viewDidLoad") + 78 at ViewController.m:23
20
21      - (void)viewDidLoad {
22          [super viewDidLoad];
-> 23          [self text:YES];
24          NSLog(@"1");
25          NSLog(@"2");
26          NSLog(@"3");

breakpoint

breakpoint set

breakpoint set

-n

viewWillAppear:

(lldb) breakpoint set -n viewWillAppear:
Breakpoint 13: 33 locations.

-f

ViewController.m

viewDidLoad

(lldb) breakpoint set -f ViewController.m -n viewDidLoad
Breakpoint 22: where = TLLDB`-[ViewController viewDidLoad] + 20 at ViewController.m:22, address = 0x000000010272a6f4

-l

ViewController.m

(lldb) breakpoint set -f ViewController.m -l 38
Breakpoint 23: where = TLLDB`-[ViewController text:] + 37 at ViewController.m:38, address = 0x000000010272a7d5

-c

text:

ret

ret
== YES

(lldb) breakpoint set -n text: -c ret == YES
Breakpoint 7: where = TLLDB`-[ViewController text:] + 30 at ViewController.m:37, address = 0x0000000105ef37ce

-o

(lldb) breakpoint set -n text: -o
'breakpoint 3': where = TLLDB`-[ViewController text:] + 30 at ViewController.m:37, address = 0x000000010b6f97ce

breakpoint command

self

po
self

po self

breakpoint command add

breakpoint command add

ViewController

viewDidLoad

self.view

-[ViewController viewDidLoad]

(lldb) breakpoint set -n "-[ViewController viewDidLoad]"
'breakpoint 3': where = TLLDB`-[ViewController viewDidLoad] + 20 at ViewController.m:23, address = 0x00000001055e6004

breakpoint

po
self.view

(lldb) breakpoint command add -o "po self.view" 3

-o

--one-liner

3

3

breakpoint

self.view

viewDidLoad

(lldb) breakpoint command add 3
Enter your debugger command(s).  Type 'DONE' to end.
> frame variable
> continue
> DONE

breakpoint command add 3

breakpoint command list

breakpoint command list

(lldb) breakpoint command list 3
'breakpoint 3':
Breakpoint commands:
frame variable
continue

frame variable

continue

breakpoint command delete

breakpoint command delete

(lldb) breakpoint command delete 3
(lldb) breakpoint command list 3
Breakpoint 3 does not have an associated command.

breakpoint list

breakpoint list

(lldb) breakpoint list
Current breakpoints:
4: name = '-[ViewController viewDidLoad]', locations = 1, resolved = 1, hit count = 0
4.1: where = TLLDB`-[ViewController viewDidLoad] + 20 at ViewController.m:23, address = 0x00000001055e6004, resolved, hit count = 0

-[ViewController viewDidLoad]

breakpoint disable/enable

breakpoint disable

(lldb) breakpoint disable 4
1 breakpoints disabled.

breakpoint enable

(lldb) breakpoint enable 4
1 breakpoints enabled.

breakpoint delete

breakpoint delete

(lldb) breakpoint delete 4
1 breakpoints deleted; 0 breakpoint locations disabled.

breakpoint delete

(lldb) breakpoint delete
About to delete all breakpoints, do you want to do that?: [Y/n] y
All breakpoints removed. (1 breakpoint)

Y

-f

(lldb) breakpoint delete -f
All breakpoints removed. (1 breakpoint)

breakpoint

watchpoint

breakpoint

watchpoint

breakpoint

watchpoint

watchpoint

watchpoint set

watchpoint set

watchpoint

watchpoint set variable

watchpoint set variable

self->_string

(lldb) watchpoint set variable self->_string
Watchpoint created: Watchpoint 1: addr = 0x7fcf3959c418 size = 8 state = enabled type = w
watchpoint spec = 'self->_string'
new value: 0x0000000000000000

watchpoint set variable

watchpoint
set variable self.string

watchpoint set expression

watchpoint set expression

(lldb) p &_model
(Modek **) $3 = 0x00007fe0dbf23280
(lldb) watchpoint set expression 0x00007fe0dbf23280
Watchpoint created: Watchpoint 1: addr = 0x7fe0dbf23280 size = 8 state = enabled type = w
new value: 0

watchpoint command

watchpoint command add

watchpoint

(lldb) watchpoint set variable _string
Watchpoint created: Watchpoint 1: addr = 0x7fe4e1444760 size = 8 state = enabled type = w
watchpoint spec = '_string'
new value: 0x0000000000000000

watchpoint command add -o

watchpoint command add -o 'bt' 1

(lldb) watchpoint command add 1
Enter your debugger command(s).  Type 'DONE' to end.
> bt
> continue
> DONE

watchpoint

breakpoint

watchpoint command list

watchpoint command list

watchpoint

command

(lldb) watchpoint command list 1
Watchpoint 1:
watchpoint commands:
bt
continue

watchpoint command delete

watchpoint command delete

watchpoint

command

(lldb) watchpoint command delete 1
(lldb) watchpoint command list 1
Watchpoint 1 does not have an associated command.

watchpoint list

watchpoint list

(lldb) watchpoint list
Number of supported hardware watchpoints: 4
Current watchpoints:
Watchpoint 1: addr = 0x7fe9f9f28e30 size = 8 state = enabled type = w
watchpoint spec = '_string'
old value: 0x0000000000000000
new value: 0x000000010128e0d0

watchpoint disable

watchpoint disable

(lldb) watchpoint disable 1
1 watchpoints disabled.

(lldb) watchpoint list
Number of supported hardware watchpoints: 4
Current watchpoints:
Watchpoint 1: addr = 0x7fe9f9f28e30 size = 8 state = disabled type = w
watchpoint spec = '_string'
old value: 0x0000000000000000
new value: 0x000000010128e0d0

watchpoint enable

watchpoint

watchpoint
enable

(lldb) watchpoint enable 1
1 watchpoints enabled.

watchpoint delete

watchpoint

watchpoint
delete

(lldb) watchpoint delete 1
1 watchpoints deleted.
(lldb) watchpoint list
Number of supported hardware watchpoints: 4
No watchpoints currently set.

watchpoint list

watchpoint1

(lldb) watchpoint delete
About to delete all watchpoints, do you want to do that?: [Y/n] y
All watchpoints removed. (2 watchpoints)

target

target modules lookup(image lookup)

target modules lookup

target
modules

image

image
lookup

image lookup --address

image lookup --address

image
lookup -a

2015-12-17 14:51:06.301 TLLDB[25086:246169] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 1 beyond bounds for empty NSArray'
*** First throw call stack:
(
0   CoreFoundation                      0x000000010accde65 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x000000010a746deb objc_exception_throw + 48
2   CoreFoundation                      0x000000010ac7c395 -[__NSArray0 objectAtIndex:] + 101
3   TLLDB                               0x000000010a1c3e36 -[ViewController viewDidLoad] + 86
4   UIKit                               0x000000010b210f98 -[UIViewController loadViewIfRequired] + 1198
5   UIKit                               0x000000010b2112e7 -[UIViewController view] + 27

-[__NSArray0 objectAtIndex:]:

objectAtIndex:

(lldb) image lookup -a 0x000000010a1c3e36
Address: TLLDB[0x0000000100000e36] (TLLDB.__TEXT.__text + 246)
Summary: TLLDB`-[ViewController viewDidLoad] + 86 at ViewController.m:32

0x000000010a1c3e36 -[ViewController viewDidLoad]

image
lookup --address

ViewController.m

image lookup --name

image lookup --name

image
lookup -n

image lookup -n

(lldb) image lookup -n dictionaryWithXMLString:
2 matches found in /Users/jiangliancheng/Library/Developer/Xcode/DerivedData/VideoIphone-aivsnqmlwjhxapdlvmdmrubbdxpq/Build/Products/Debug-iphoneos/BaiduIphoneVideo.app/BaiduIphoneVideo:
Address: BaiduIphoneVideo[0x00533a7c] (BaiduIphoneVideo.__TEXT.__text + 5414908)
Summary: BaiduIphoneVideo`+[NSDictionary(SAPIXmlDictionary) dictionaryWithXMLString:] at XmlDictionary.m
Module: file = "/Users/jiangliancheng/Library/Developer/Xcode/DerivedData/VideoIphone-aivsnqmlwjhxapdlvmdmrubbdxpq/Build/Products/Debug-iphoneos/BaiduIphoneVideo.app/BaiduIphoneVideo", arch = "armv7"
CompileUnit: id = {0x00000000}, file = "/Users/jiangliancheng/Development/Work/iOS_ShareLib/SharedLib/Srvcs/BDPassport4iOS/BDPassport4iOS/SAPI/Extensive/ThirdParty/XMLDictionary/XmlDictionary.m", language = "Objective-C"
Function: id = {0x23500000756}, name = "+[NSDictionary(SAPIXmlDictionary) dictionaryWithXMLString:]", range = [0x005a6a7c-0x005a6b02)
FuncType: id = {0x23500000756}, decl = XmlDictionary.m:189, clang_type = "NSDictionary *(NSString *)"
Blocks: id = {0x23500000756}, range = [0x005a6a7c-0x005a6b02)
LineEntry: [0x005a6a7c-0x005a6a98): /Users/jiangliancheng/Development/Work/iOS_ShareLib/SharedLib/Srvcs/BDPassport4iOS/BDPassport4iOS/SAPI/Extensive/ThirdParty/XMLDictionary/XmlDictionary.m
Symbol: id = {0x0000f2d5}, range = [0x005a6a7c-0x005a6b04), name="+[NSDictionary(SAPIXmlDictionary) dictionaryWithXMLString:]"
Variable: id = {0x23500000771}, name = "self", type = "Class", location =  [sp+32], decl =
Variable: id = {0x2350000077e}, name = "_cmd", type = "SEL", location =  [sp+28], decl =
Variable: id = {0x2350000078b}, name = "string", type = "NSString *", location =  [sp+24], decl = XmlDictionary.m:189
Variable: id = {0x23500000799}, name = "data", type = "NSData *", location =  [sp+20], decl = XmlDictionary.m:192
Address: BaiduIphoneVideo[0x012ee160] (BaiduIphoneVideo.__TEXT.__text + 19810016)
Summary: BaiduIphoneVideo`+[NSDictionary(XMLDictionary) dictionaryWithXMLString:] at XMLDictionary.m
Module: file = "/Users/jiangliancheng/Library/Developer/Xcode/DerivedData/VideoIphone-aivsnqmlwjhxapdlvmdmrubbdxpq/Build/Products/Debug-iphoneos/BaiduIphoneVideo.app/BaiduIphoneVideo", arch = "armv7"
CompileUnit: id = {0x00000000}, file = "/Users/wingle/Workspace/qqlive4iphone/iphone_4.0_fabu_20150601/Common_Proj/mobileTAD/VIDEO/Library/Third Party/XMLDictionary/XMLDictionary.m", language = "Objective-C"
Function: id = {0x79900000b02}, name = "+[NSDictionary(XMLDictionary) dictionaryWithXMLString:]", range = [0x01361160-0x0136119a)
FuncType: id = {0x79900000b02}, decl = XMLDictionary.m:325, clang_type = "NSDictionary *(NSString *)"
Blocks: id = {0x79900000b02}, range = [0x01361160-0x0136119a)
LineEntry: [0x01361160-0x01361164): /Users/wingle/Workspace/qqlive4iphone/iphone_4.0_fabu_20150601/Common_Proj/mobileTAD/VIDEO/Library/Third Party/XMLDictionary/XMLDictionary.m
Symbol: id = {0x0003a1e9}, range = [0x01361160-0x0136119c), name="+[NSDictionary(XMLDictionary) dictionaryWithXMLString:]"
Variable: id = {0x79900000b1e}, name = "self", type = "Class", location =  r0, decl =
Variable: id = {0x79900000b2c}, name = "_cmd", type = "SEL", location =  r1, decl =
Variable: id = {0x79900000b3a}, name = "string", type = "NSString *", location =  r2, decl = XMLDictionary.m:325
Variable: id = {0x79900000b4a}, name = "data", type = "NSData *", location =  r2, decl = XMLDictionary.m:327

CompileUnit: id = {0x00000000}, file = "/Users/jiangliancheng/Development/Work/iOS_ShareLib/SharedLib/Srvcs/BDPassport4iOS/BDPassport4iOS/SAPI/Extensive/ThirdParty/XMLDictionary/XmlDictionary.m", language = "Objective-C"
CompileUnit: id = {0x00000000}, file = "/Users/wingle/Workspace/qqlive4iphone/iphone_4.0_fabu_20150601/Common_Proj/mobileTAD/VIDEO/Library/Third Party/XMLDictionary/XMLDictionary.m", language = "Objective-C"

image lookup --type

image lookup --type

image
lookup -t

(lldb) image lookup -t Model
Best match found in /Users/jiangliancheng/Library/Developer/Xcode/DerivedData/TLLDB-beqoowskwzbttrejseahdoaivpgq/Build/Products/Debug-iphonesimulator/TLLDB.app/TLLDB:
id = {0x30000002f}, name = "Model", byte-size = 32, decl = Modek.h:11, clang_type = "@interface Model : NSObject{
NSString * _bb;
NSString * _cc;
NSString * _name;
}
@property ( getter = name,setter = setName:,readwrite,nonatomic ) NSString * name;
@end
"

image
lookup -t

target stop-hook

breakpoint

watchpoint

target stop-hook

target stop-hook

breakpoint

watchpoint

pause

debug
view hierarchy

target stop-hook add & display

(lldb) target stop-hook add -o "frame variable"
Stop hook #4 added.

target stop-hook add

-o

--one-liner

- Hook 1 (frame variable)
(ViewController *) self = 0x00007fd55b12e380
(SEL) _cmd = "viewDidLoad"
(NSMutableURLRequest *) request = 0x00007fd55b1010c0

frame variable

target stop-hook add
-o "p xxx"

display

(lldb) target stop-hook add -o "p self.view"
(lldb) display self.view

display

p

e

expression

target stop-hook list

stop-hook

stop-hook
list

(lldb) target stop-hook list
Hook: 4
State: enabled
Commands:
frame variable

Hook: 5
State: enabled
Commands:
expression self.view

Hook: 6
State: enabled
Commands:
expr -- self.view

stop-hook

stop-hook

target stop-hook delete & undisplay

target stop-hook delete

stop-hook

undisplay

(lldb) target stop-hook delete 4
(lldb) undisplay 5

target stop-hook delete

undisplay

stop-hook

target stop-hook disable/enable

stop-hook

target
stop-hook disable

(lldb) target stop-hook disable 8

stop-hook

stop-hook

(lldb) target stop-hook disable

disable

enable

stop-hook

target
stop-hook enable

(lldb) target stop-hook enable 8

stop-hook

(lldb) target stop-hook enable

Extension

@import UIKit

(lldb) p self.view.frame
error: property 'frame' not found on object of type 'UIView *'
error: 1 errors parsing expression
(lldb) e @import UIKit
(lldb) p self.view.frame
(CGRect) $0 = (origin = (x = 0, y = 0), size = (width = 375, height = 667))

e @import UIKit

e @import
UIKit

e @import
UIKit

UIKit

import
UIKit

e
@import UIKit

stop-hook

stop-hook

p
frame

stop-hook

display @import UIKit
target stop-hook add -o "target stop-hook disable"

display

@import
UIKit

@import UIKit

target
stop-hook disable

stop-hook

pause

debug
view hierarchy

stop-hook

@import
UIKit

target symbols add(add-dsym)

target symbols add

add-dsym

add-dsym

add-dsym ~/.../XXX.dSYM

help & apropos

help

apropos

help

(lldb) help
Debugger commands:

apropos           -- Find a list of debugger commands related to a particular
word/subject.
breakpoint        -- A set of commands for operating on breakpoints. Also see
_regexp-break.
help              -- Show a list of all debugger commands, or give details
about specific commands.
script            -- Pass an expression to the script interpreter for
evaluation and return the results. Drop into the
interactive interpreter if no expression is given.
settings          -- A set of commands for manipulating internal settable
debugger variables.
source            -- A set of commands for accessing source file information
target            -- A set of commands for operating on debugger targets.
thread            -- A set of commands for operating on one or more threads
within a running process.
type              -- A set of commands for operating on the type system
version           -- Show version of LLDB debugger.
watchpoint        -- A set of commands for operating on watchpoints.
....(东西太多，只截取了一部分)

help <command-name>

watchpoint

(lldb) help watchpoint
The following subcommands are supported:

command -- A set of commands for adding, removing and examining bits of
code to be executed when the watchpoint is hit (watchpoint
'commmands').
delete  -- Delete the specified watchpoint(s).  If no watchpoints are
specified, delete them all.
disable -- Disable the specified watchpoint(s) without removing it/them.
If no watchpoints are specified, disable them all.
enable  -- Enable the specified disabled watchpoint(s). If no watchpoints
are specified, enable all of them.
ignore  -- Set ignore count on the specified watchpoint(s).  If no
watchpoints are specified, set them all.
list    -- List all watchpoints at configurable levels of detail.
modify  -- Modify the options on a watchpoint or set of watchpoints in
the executable.  If no watchpoint is specified, act on the
last created watchpoint.  Passing an empty argument clears the
modification.
set     -- A set of commands for setting a watchpoint.

apropos

apropos

stop-hook

stop-hook

(lldb) apropos stop-hook
The following built-in commands may relate to 'stop-hook':
_regexp-display          -- Add an expression evaluation stop-hook.
_regexp-undisplay        -- Remove an expression evaluation stop-hook.
target stop-hook         -- A set of commands for operating on debugger
target stop-hooks.
target stop-hook add     -- Add a hook to be executed when the target stops.
target stop-hook delete  -- Delete a stop-hook.
target stop-hook disable -- Disable a stop-hook.
target stop-hook enable  -- Enable a stop-hook.
target stop-hook list    -- List all stop-hooks.

apropos stop-hook

stop-hook

常用的Debug快捷键

End

help

apropos

Reference