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| <title>LLDB to GDB Command Map</title> |
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| <div class="www_title"> |
| The <strong>LLDB</strong> Debugger |
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| <div class="post"> |
| |
| <h1 class ="postheader">GDB to LLDB Command Map</h1> |
| <div class="post"> |
| |
| <p>Below is a table of GDB commands with the LLDB counterparts. |
| The built in GDB-compatibility aliases in LLDB are also |
| listed. The full lldb command names are often long, but any |
| unique short form can be used. Instead of "<b>breakpoint set</b>", |
| "<b>br se</b>" is also acceptable.</p> |
| </div> |
| <div class="postfooter"></div> |
| |
| <h1 class ="postheader">Execution Commands</h1> |
| <div class="post"> |
| |
| <p> |
| |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Launch a process no arguments.</td></tr> |
| <td class="content"> |
| <b>(gdb)</b> run<br> |
| <b>(gdb)</b> r |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process launch<br> |
| <b>(lldb)</b> run<br> |
| <b>(lldb)</b> r |
| </td> |
| </tr> |
| |
| |
| <tr><td class="header" colspan="2">Launch a process with arguments <code><args></code>.</td></tr> |
| <td class="content"> |
| <b>(gdb)</b> run <args><br> |
| <b>(gdb)</b> r <args> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process launch -- <args><br> |
| <b>(lldb)</b> r <args> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Launch a process for with arguments <b><code>a.out 1 2 3</code></b> without having to supply the args every time.</td></tr> |
| <td class="content"> |
| <b>%</b> gdb --args a.out 1 2 3<br> |
| <b>(gdb)</b> run<br> |
| ...<br> |
| <b>(gdb)</b> run<br> |
| ...<br> |
| </td> |
| <td class="content"> |
| <b>%</b> lldb -- a.out 1 2 3<br> |
| <b>(lldb)</b> run<br> |
| ...<br> |
| <b>(lldb)</b> run<br> |
| ...<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Or:</td></tr> |
| <td class="content"> |
| <b>(gdb)</b> set args 1 2 3<br> |
| <b>(gdb)</b> run<br> |
| ...<br> |
| <b>(gdb)</b> run<br> |
| ...<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> settings set target.run-args 1 2 3<br> |
| <b>(lldb)</b> run<br> |
| ...<br> |
| <b>(lldb)</b> run<br> |
| ...<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Launch a process with arguments in new terminal window (Mac OS X only).</td></tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process launch --tty -- <args><br> |
| <b>(lldb)</b> pro la -t -- <args><br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Launch a process with arguments in existing terminal <cope>/dev/ttys006</code> (Mac OS X only).</td></tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process launch --tty=/dev/ttys006 -- <args><br> |
| <b>(lldb)</b> pro la -t/dev/ttys006 -- <args><br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set environment variables for process before launching.</td></tr> |
| <td class="content"> |
| <b>(gdb)</b> set env DEBUG 1<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> settings set target.env-vars DEBUG=1<br> |
| <b>(lldb)</b> set se target.env-vars DEBUG=1<br> |
| <b>(lldb)</b> env DEBUG=1<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the arguments that will be or were passed to the program when run.</td></tr> |
| <td class="content"> |
| <b>(gdb)</b> show args<br> |
| Argument list to give program being debugged when it is started is "1 2 3".<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> settings show target.run-args<br> |
| target.run-args (array of strings) =<br> |
| [0]: "1"<br> |
| [1]: "2"<br> |
| [2]: "3"<br> |
| </td> |
| </tr> |
| |
| |
| <tr><td class="header" colspan="2">Set environment variables for process and launch process in one command.</td></tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process launch -v DEBUG=1<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Attach to a process with process ID 123.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> attach 123 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process attach --pid 123<br> |
| <b>(lldb)</b> attach -p 123 |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Attach to a process named "a.out".</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> attach a.out |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process attach --name a.out<br> |
| <b>(lldb)</b> pro at -n a.out |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Wait for a process named "a.out" to launch and attach.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> attach -waitfor a.out |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> process attach --name a.out --waitfor<br> |
| <b>(lldb)</b> pro at -n a.out -w |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Attach to a remote gdb protocol server running on system "eorgadd", port 8000.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> target remote eorgadd:8000 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> gdb-remote eorgadd:8000 |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Attach to a remote gdb protocol server running on the local system, port 8000.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> target remote localhost:8000 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> gdb-remote 8000 |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Attach to a Darwin kernel in kdp mode on system "eorgadd".</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> kdp-reattach eorgadd |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> kdp-remote eorgadd |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Do a source level single step in the currently selected thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> step<br> |
| <b>(gdb)</b> s |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread step-in<br> |
| <b>(lldb)</b> step<br> |
| <b>(lldb)</b> s |
| </td> |
| </tr> |
| |
| |
| <tr><td class="header" colspan="2">Do a source level single step over in the currently selected thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> next<br> |
| <b>(gdb)</b> n |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread step-over<br> |
| <b>(lldb)</b> next<br> |
| <b>(lldb)</b> n<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Do an instruction level single step in the currently selected thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> stepi<br> |
| <b>(gdb)</b> si |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread step-inst<br> |
| <b>(lldb)</b> si<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Do an instruction level single step over in the currently selected thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> nexti<br> |
| <b>(gdb)</b> ni |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread step-inst-over<br> |
| <b>(lldb)</b> ni |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Step out of the currently selected frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> finish<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread step-out<br> |
| <b>(lldb)</b> finish<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Return immediately from the currently selected frame, with an optional return value.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> return <RETURN EXPRESSION><br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread return <RETURN EXPRESSION><br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Backtrace and disassemble every time you stop.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target stop-hook add<br> |
| Enter your stop hook command(s). Type 'DONE' to end.<br> |
| > bt<br> |
| > disassemble --pc<br> |
| > DONE<br> |
| Stop hook #1 added.<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| <div class="postfooter"></div> |
| |
| <h1 class ="postheader">Breakpoint Commands</h1> |
| <div class="post"> |
| |
| <p> |
| |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint at all functions named <b>main</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> break main |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --name main<br> |
| <b>(lldb)</b> br s -n main<br> |
| <b>(lldb)</b> b main |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint in file <b>test.c</b> at line <b>12</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> break test.c:12 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --file test.c --line 12<br> |
| <b>(lldb)</b> br s -f test.c -l 12<br> |
| <b>(lldb)</b> b test.c:12 |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint at all C++ methods whose basename is <b>main</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> break main<br> |
| <i>(Hope that there are no C funtions named <b>main</b>)</i>. |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --method main<br> |
| <b>(lldb)</b> br s -M main<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint at and object C function: <b>-[NSString stringWithFormat:]</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> break -[NSString stringWithFormat:]<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --name "-[NSString stringWithFormat:]"<br> |
| <b>(lldb)</b> b -[NSString stringWithFormat:]<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint at all Objective C methods whose selector is <b>count</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> break count<br> |
| <i>(Hope that there are no C or C++ funtions named <b>count</b>)</i>. |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --selector count<br> |
| <b>(lldb)</b> br s -S count<br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Set a breakpoint by regular expression on function name.</td></tr> |
| |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> rbreak regular-expression<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --func-regex regular-expression<br> |
| <b>(lldb)</b> br s -r regular-expression<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Ensure that breakpoints by file and line work for #included .c/.cpp/.m files.</td></tr> |
| |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> b foo.c:12<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> settings set target.inline-breakpoint-strategy always<br> |
| <b>(lldb)</b> br s -f foo.c -l 12<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a breakpoint by regular expression on source file contents.</td></tr> |
| |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> shell grep -e -n pattern source-file<br> |
| <b>(gdb)</b> break source-file:CopyLineNumbers<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint set --source-pattern regular-expression --file SourceFile<br> |
| <b>(lldb)</b> br s -p regular-expression -f file<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">List all breakpoints.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info break<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint list<br> |
| <b>(lldb)</b> br l<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Delete a breakpoint.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> delete 1<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> breakpoint delete 1<br> |
| <b>(lldb)</b> br del 1<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| <div class="postfooter"></div> |
| |
| <h1 class ="postheader">Watchpoint Commands</h1> |
| <div class="post"> |
| |
| <p> |
| |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a watchpoint on a variable when it is written to.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> watch global_var |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> watchpoint set variable global_var<br> |
| <b>(lldb)</b> wa s v global_var<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a watchpoint on a memory location when it is written into. The size of the region to watch for defaults to the pointer size if no '-x byte_size' is specified. |
| This command takes raw input, evaluated as an expression returning an unsigned integer pointing to the start of the region, after the '--' option terminator.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> watch -location g_char_ptr |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> watchpoint set expression -- my_ptr<br> |
| <b>(lldb)</b> wa s e -- my_ptr<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Set a condition on a watchpoint</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> watch set var global<br> |
| <b>(lldb)</b> watchpoint modify -c '(global==5)'<br> |
| <b>(lldb)</b> c<br> |
| ...<br> |
| <b>(lldb)</b> bt<br> |
| * thread #1: tid = 0x1c03, 0x0000000100000ef5 a.out`modify + 21 at main.cpp:16, stop reason = watchpoint 1<br> |
| frame #0: 0x0000000100000ef5 a.out`modify + 21 at main.cpp:16<br> |
| frame #1: 0x0000000100000eac a.out`main + 108 at main.cpp:25<br> |
| frame #2: 0x00007fff8ac9c7e1 libdyld.dylib`start + 1<br> |
| <b>(lldb)</b> frame var global<br> |
| (int32_t) global = 5<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">List all watchpoints.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info break<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> watchpoint list<br> |
| <b>(lldb)</b> watch l<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Delete a watchpoint.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> delete 1<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> watchpoint delete 1<br> |
| <b>(lldb)</b> watch del 1<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| |
| <div class="postfooter"></div> |
| <h1 class ="postheader">Examining Variables</h1> |
| <div class="post"> |
| <p> |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the arguments and local variables for the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info args<br> |
| and<br> |
| <b>(gdb)</b> info locals<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame variable<br> |
| <b>(lldb)</b> fr v<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the local variables for the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info locals<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame variable --no-args<br> |
| <b>(lldb)</b> fr v -a<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the contents of local variable "bar".</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> p bar<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame variable bar <br> |
| <b>(lldb)</b> fr v bar <br> |
| <b>(lldb)</b> p bar <br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the contents of local variable "bar" formatted as hex.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> p/x bar<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame variable --format x bar <br> |
| <b>(lldb)</b> fr v -f x bar <br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the contents of global variable "baz".</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> p baz<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target variable baz <br> |
| <b>(lldb)</b> ta v baz <br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the global/static variables defined in the current source file.</td></tr> |
| <tr> |
| <td class="content"> |
| n/a<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target variable <br> |
| <b>(lldb)</b> ta v <br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Display a the variable "argc" and "argv" every time you stop.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> display argc<br> |
| <b>(gdb)</b> display argv<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target stop-hook add --one-liner "frame variable argc argv"<br> |
| <b>(lldb)</b> ta st a -o "fr v argc argv"<br> |
| <b>(lldb)</b> display argc<br> |
| <b>(lldb)</b> display argv<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Display a the variable "argc" and "argv" only when you stop in the function named <b>main</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target stop-hook add --name main --one-liner "frame variable argc argv"<br> |
| <b>(lldb)</b> ta st a -n main -o "fr v argc argv"<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Display the variable "*this" only when you stop in c class named <b>MyClass</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> target stop-hook add --classname MyClass --one-liner "frame variable *this"<br> |
| <b>(lldb)</b> ta st a -c MyClass -o "fr v *this"<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| |
| |
| |
| |
| <h1 class ="postheader">Evaluating expressions</h1> |
| <div class="post"> |
| <p> |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Evaluating a generalized expression in the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> print (int) printf ("Print nine: %d.", 4 + 5)<br> |
| or if you don't want to see void returns: <br> |
| <b>(gdb)</b> call (int) printf ("Print nine: %d.", 4 + 5)<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> expr (int) printf ("Print nine: %d.", 4 + 5)<br> |
| or using the print alias:<br> |
| <b>(lldb)</b> print (int) printf ("Print nine: %d.", 4 + 5)<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Creating and assigning a value to a convenience variable.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set $foo = 5<br> |
| <b>(gdb)</b> set variable $foo = 5<br> |
| or using the print command <br> |
| <b>(gdb)</b> print $foo = 5<br> |
| or using the call command <br> |
| <b>(gdb)</b> call $foo = 5<br> |
| and if you want to specify the type of the variable: |
| <b>(gdb)</b> set $foo = (unsigned int) 5<br> |
| |
| </td> |
| <td class="content"> |
| In lldb you evaluate a variable declaration expression as you would write it in C:<br> |
| <b>(lldb)</b> expr unsigned int $foo = 5<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Printing the ObjC "description" of an object.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> po [SomeClass returnAnObject]<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> expr -o -- [SomeClass returnAnObject]<br> |
| or using the po alias:<br> |
| <b>(lldb)</b> po [SomeClass returnAnObject]<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Print the dynamic type of the result of an expression.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set print object 1<br> |
| <b>(gdb)</b> p someCPPObjectPtrOrReference<br> |
| only works for C++ objects.<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> expr -d 1 -- [SomeClass returnAnObject]<br> |
| <b>(lldb)</b> expr -d 1 -- someCPPObjectPtrOrReference<br> |
| or set dynamic type printing to be the default: |
| <b>(lldb)</b> settings set target.prefer-dynamic run-target<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Calling a function so you can stop at a breakpoint in the function.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set unwindonsignal 0<br> |
| <b>(gdb)</b> p function_with_a_breakpoint()<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> expr -i 0 -- function_with_a_breakpoint()<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Calling a function that crashes, and stopping when the function crashes.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set unwindonsignal 0<br> |
| <b>(gdb)</b> p function_which_crashes()<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> expr -u 0 -- function_which_crashes()<br> |
| </td> |
| </tr> |
| |
| |
| </table> |
| <p> |
| </div> |
| |
| <h1 class ="postheader">Examining Thread State</h1> |
| <div class="post"> |
| <p> |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| |
| <tr><td class="header" colspan="2">Show the stack backtrace for the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> bt<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread backtrace<br> |
| <b>(lldb)</b> bt<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the stack backtraces for all threads.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> thread apply all bt |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread backtrace all<br> |
| <b>(lldb)</b> bt all |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Backtrace the first five frames of the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> bt 5 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> thread backtrace -c 5<br> |
| <b>(lldb)</b> bt 5 (<i>lldb-169 and later</i>)<br> |
| <b>(lldb)</b> bt -c 5 (<i>lldb-168 and earlier</i>) |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Select a different stack frame by index for the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> frame 12 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame select 12<br> |
| <b>(lldb)</b> fr s 12<br> |
| <b>(lldb)</b> f 12<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">List information about the currently selected frame in the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame info<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Select the stack frame that called the current stack frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> up |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> up<br> |
| <b>(lldb)</b> frame select --relative=1<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Select the stack frame that is called by the current stack frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> down |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> down<br> |
| <b>(lldb)</b> frame select --relative=-1<br> |
| <b>(lldb)</b> fr s -r-1<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Select a different stack frame using a relative offset.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> up 2<br> |
| <b>(gdb)</b> down 3<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> frame select --relative 2<br> |
| <b>(lldb)</b> fr s -r2<br> |
| <br> |
| <b>(lldb)</b> frame select --relative -3<br> |
| <b>(lldb)</b> fr s -r-3<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the general purpose registers for the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info registers<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register read<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Write a new decimal value '123' to the current thread register 'rax'.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> p $rax = 123<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register write rax 123<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Skip 8 bytes ahead of the current program counter (instruction pointer). Note that we use backticks to evaluate an expression and insert the scalar result in LLDB.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> jump *$pc+8<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register write pc `$pc+8`<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the general purpose registers for the current thread formatted as <b>signed decimal</b>. LLDB tries to use |
| the same format characters as <b>printf(3)</b> when possible. Type "help format" to see the full list of format specifiers.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register read --format i<br> |
| <b>(lldb)</b> re r -f i<br> |
| <br> |
| <i>LLDB now supports the GDB shorthand format syntax but there can't be space after the command:</i><br> |
| <b>(lldb)</b> register read/d<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show all registers in all register sets for the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info all-registers<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register read --all<br> |
| <b>(lldb)</b> re r -a<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the values for the registers named "rax", "rsp" and "rbp" in the current thread.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info all-registers rax rsp rbp<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register read rax rsp rbp<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show the values for the register named "rax" in the current thread formatted as <b>binary</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> p/t $rax<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> register read --format binary rax<br> |
| <b>(lldb)</b> re r -f b rax<br> |
| <br> |
| <i>LLDB now supports the GDB shorthand format syntax but there can't be space after the command:</i><br> |
| <b>(lldb)</b> register read/t rax<br> |
| <b>(lldb)</b> p/t $rax<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Read memory from address 0xbffff3c0 and show 4 hex uint32_t values.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> x/4xw 0xbffff3c0<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> memory read --size 4 --format x --count 4 0xbffff3c0<br> |
| <b>(lldb)</b> me r -s4 -fx -c4 0xbffff3c0<br> |
| <b>(lldb)</b> x -s4 -fx -c4 0xbffff3c0<br> |
| <br> |
| <i>LLDB now supports the GDB shorthand format syntax but there can't be space after the command:</i><br> |
| <b>(lldb)</b> memory read/4xw 0xbffff3c0<br> |
| <b>(lldb)</b> x/4xw 0xbffff3c0<br> |
| <b>(lldb)</b> memory read --gdb-format 4xw 0xbffff3c0<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Read memory starting at the expression "argv[0]".</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> x argv[0]<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> memory read `argv[0]`<br> |
| <i><b>NOTE:</b> any command can inline a scalar expression result (as long as the target is stopped) using backticks around any expression:</i><br> |
| <b>(lldb)</b> memory read --size `sizeof(int)` `argv[0]`<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Read 512 bytes of memory from address 0xbffff3c0 and save results to a local file as <b>text</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set logging on<br> |
| <b>(gdb)</b> set logging file /tmp/mem.txt<br> |
| <b>(gdb)</b> x/512bx 0xbffff3c0<br> |
| <b>(gdb)</b> set logging off<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> memory read --outfile /tmp/mem.txt --count 512 0xbffff3c0<br> |
| <b>(lldb)</b> me r -o/tmp/mem.txt -c512 0xbffff3c0<br> |
| <b>(lldb)</b> x/512bx -o/tmp/mem.txt 0xbffff3c0<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Save binary memory data starting at 0x1000 and ending at 0x2000 to a file.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> dump memory /tmp/mem.bin 0x1000 0x2000 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> memory read --outfile /tmp/mem.bin --binary 0x1000 0x1200<br> |
| <b>(lldb)</b> me r -o /tmp/mem.bin -b 0x1000 0x1200<br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Get information about a specific heap allocation (available on Mac OS X only).</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info malloc 0x10010d680 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> command script import lldb.macosx.heap<br> |
| <b>(lldb)</b> process launch --environment MallocStackLogging=1 -- [ARGS]<br> |
| <b>(lldb)</b> malloc_info --stack-history 0x10010d680<br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Get information about a specific heap allocation and cast the result to any dynamic type that can be deduced (available on Mac OS X only)</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> command script import lldb.macosx.heap<br> |
| <b>(lldb)</b> malloc_info --type 0x10010d680<br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Find all heap blocks that contain a pointer specified by an expression EXPR (available on Mac OS X only).</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> command script import lldb.macosx.heap<br> |
| <b>(lldb)</b> ptr_refs EXPR <br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Find all heap blocks that contain a C string anywhere in the block (available on Mac OS X only).</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> command script import lldb.macosx.heap<br> |
| <b>(lldb)</b> cstr_refs CSTRING<br> |
| </td> |
| </tr> |
| <tr><td class="header" colspan="2">Disassemble the current function for the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> disassemble |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --frame<br> |
| <b>(lldb)</b> di -f |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Disassemble any functions named <b>main</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> disassemble main |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --name main<br> |
| <b>(lldb)</b> di -n main |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Disassemble an address range.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> disassemble 0x1eb8 0x1ec3 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --start-address 0x1eb8 --end-address 0x1ec3<br> |
| <b>(lldb)</b> di -s 0x1eb8 -e 0x1ec3<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Disassemble 20 instructions from a given address.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> x/20i 0x1eb8 |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --start-address 0x1eb8 --count 20<br> |
| <b>(lldb)</b> di -s 0x1eb8 -c 20<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Show mixed source and disassembly for the current function for the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| n/a |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --frame --mixed<br> |
| <b>(lldb)</b> di -f -m |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Disassemble the current function for the current frame and show the opcode bytes.</td></tr> |
| <tr> |
| <td class="content"> |
| n/a |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --frame --bytes<br> |
| <b>(lldb)</b> di -f -b |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Disassemble the current source line for the current frame.</td></tr> |
| <tr> |
| <td class="content"> |
| n/a |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> disassemble --line<br> |
| <b>(lldb)</b> di -l |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| <div class="postfooter"></div> |
| |
| <h1 class ="postheader">Executable and Shared Library Query Commands</h1> |
| <div class="post"> |
| |
| <p> |
| |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| |
| <tr><td class="header" colspan="2">List the main executable and all dependent shared libraries.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info shared<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image list<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Look up information for a raw address in the executable or any shared libraries.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info symbol 0x1ec4<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image lookup --address 0x1ec4<br> |
| <b>(lldb)</b> im loo -a 0x1ec4<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Look up functions matching a regular expression in a binary.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info function <FUNC_REGEX><br> |
| </td> |
| <td class="content"> |
| This one finds debug symbols:<br> |
| <b>(lldb)</b> image lookup -r -n <FUNC_REGEX><br><br> |
| This one finds non-debug symbols:<br> |
| <b>(lldb)</b> image lookup -r -s <FUNC_REGEX><br><br> |
| Provide a list of binaries as arguments to limit the search. |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Find full souce line information.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> info line 0x1ec4<br> |
| </td> |
| <td class="content"> |
| This one is a bit messy at present. Do:<br><br> |
| <b>(lldb)</b> image lookup -v --address 0x1ec4<br><br> |
| and look for the LineEntry line, which will have the full source path and |
| line range information.<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Look up information for an address in <b>a.out</b> only.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image lookup --address 0x1ec4 a.out<br> |
| <b>(lldb)</b> im loo -a 0x1ec4 a.out<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Look up information for for a type <code>Point</code> by name.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> ptype Point<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image lookup --type Point<br> |
| <b>(lldb)</b> im loo -t Point<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Dump all sections from the main executable and any shared libraries.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> maintenance info sections<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image dump sections<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Dump all sections in the <b>a.out</b> module.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image dump sections a.out<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Dump all symbols from the main executable and any shared libraries.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image dump symtab<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Dump all symbols in <b>a.out</b> and <b>liba.so</b>.</td></tr> |
| <tr> |
| <td class="content"> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> image dump symtab a.out liba.so<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| <div class="postfooter"></div> |
| <h1 class ="postheader">Miscellaneous</h1> |
| <div class="post"> |
| <p> |
| <table class="stats" width="620" cellspacing="0"> |
| <tr> |
| <td class="hed" width="50%">GDB</td> |
| <td class="hed" width="50%">LLDB</td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Echo text to the screen.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> echo Here is some text\n<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> script print "Here is some text"<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Remap source file pathnames for the debug session. If your source files are no longer located in the same location as when the program was built --- maybe the program was built on a different computer --- you need to tell the debugger how to find the sources at their local file path instead of the build system's file path.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> set pathname-substitutions /buildbot/path /my/path<br> |
| </td> |
| <td class="content"> |
| <b>(lldb)</b> settings set target.source-map /buildbot/path /my/path<br> |
| </td> |
| </tr> |
| |
| <tr><td class="header" colspan="2">Supply a catchall directory to search for source files in.</td></tr> |
| <tr> |
| <td class="content"> |
| <b>(gdb)</b> directory /my/path<br> |
| </td> |
| <td class="content"> |
| (<i>No equivalent command - use the source-map instead.)<br> |
| </td> |
| </tr> |
| |
| </table> |
| <p> |
| </div> |
| |
| <div class="postfooter"></div> |
| |
| <p> |
| |
| |
| </div> |
| </div> |
| </div> |
| </div> |
| </body> |
| </html> |
