The line that is pointed by the arrow is the next line will be executed.
Short commands
r: run
c: continue
b: break
n: next
Enter: repeat last command
s(step): step into a function
q: quit
How to use LLDB
-
Generate source-level debug information
$ gcc -g hello.c -
run the lldb on the executable
$ lldb a.out -
then run the program
(lldb) run
Setting Breakpoints
(lldb) break set -f demo.cpp -l #lineNum
(lldb) br s -f demo.cpp -l #
(lldb) b demo.cpp : #
Breakpoints with Symbols
On a function
(lldb) b square(int)
On a class method
(lldb) b Demo::demo()
Inside a namespace
(lldb) b LLDBDemo::add(int,int)
Manipulating Breakpoints
Listing breakpoints
(lldb) br list
Deleting breakpoints
(lldb) br del #
(lldb) br del
Stepping Around
Step over
(lldb) next
(lldb) n
Step into
(lldb) step or (lldb) s
Continue
(lldb) c
Inspecting Variables
Print Variable Contents
(lldb) p varname
Frame Variables(see all seeable vars)
(lldb) frame variable or fr v
Current Line
(lldb) frame select
Backtrace and Frames
Backtrace
(lldb) bt
Switching Frames
(lldb) frame select 0
(lldb) f 2
Using Watchpoints
Program must be running in order to set watchpoints.
Global variable
(lldb) watchpoint set variable globalVariable
(lldb) watchpoint set variable -w read | write | read_write globalVariable
Member variable
(lldb) b main
(lldb) w s v d.memberVar
Terminating
Kill process
(lldb) kill
Exiting
(lldb) quit
Others
repeat the last command
press Enter
breakpoint at a functon
b main or b func_name
look at the variable
print [var_name]
print all variables
fr v