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<title>LLDB Goals</title>
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<div class="www_title">
The <strong>LLDB</strong> Debugger
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<div class="post">
<h1 class ="postheader">LLDB to GDB Command Map</h1>
<div class="post">
<p>Below is a table of LLDB commands with the GDB counterparts.
The built in GDB compatability aliases in GDB are also
listed.</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%">LLDB</td>
<td class="hed" width="50%">GDB</td>
</tr>
<tr><td class="header" colspan="2">Launch a process no arguments.</td></tr>
<td class="content">
<b>(lldb)</b> process launch<br>
<b>(lldb)</b> run<br>
<b>(lldb)</b> r
</td>
<td class="content">
<b>(gdb)</b> run<br>
<b>(gdb)</b> r
</td>
</tr>
<tr><td class="header" colspan="2">Launch a process with arguments <code>&lt;args&gt;</code>.</td></tr>
<td class="content">
<b>(lldb)</b> process launch -- &lt;args&gt;<br>
<b>(lldb)</b> run -- &lt;args&gt;<br>
<b>(lldb)</b> r &lt;args&gt;
</td>
<td class="content">
<b>(gdb)</b> run &lt;args&gt;<br>
<b>(gdb)</b> r &lt;args&gt;
</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> lldb a.out 1 2 3<br>
<b>(lldb)</b> run<br>
...<br>
<b>(lldb)</b> run<br>
...<br>
</td>
<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>
</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">
<b>(lldb)</b> process launch --tty -- &lt;args&gt;<br>
<b>(lldb)</b> process launch -t -- &lt;args&gt;<br>
</td>
<td class="content">
</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">
<b>(lldb)</b> process launch --tty=/dev/ttys006 -- &lt;args&gt;<br>
<b>(lldb)</b> process launch -t/dev/ttys006 -- &lt;args&gt;<br>
</td>
<td class="content">
</td>
</tr>
<tr><td class="header" colspan="2">Attach to a process with process ID 123.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> process attach --pid 123<br>
<b>(lldb)</b> attach -p 123
</td>
<td class="content">
<b>(gdb)</b> attach 123
</td>
</tr>
<tr><td class="header" colspan="2">Attach to a process named "a.out".</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> process attach --name a.out<br>
<b>(lldb)</b> process attach -n a.out
</td>
<td class="content">
<b>(gdb)</b> attach 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>(lldb)</b> process attach --name a.out --waitfor<br>
<b>(lldb)</b> process attach -n a.out -w
</td>
<td class="content">
<b>(gdb)</b> attach -waitfor a.out
</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>(lldb)</b> thread step-in<br>
<b>(lldb)</b> step<br>
<b>(lldb)</b> s
</td>
<td class="content">
<b>(gdb)</b> step<br>
<b>(gdb)</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>(lldb)</b> thread step-over<br>
<b>(lldb)</b> next<br>
<b>(lldb)</b> n<br>
</td>
<td class="content">
<b>(gdb)</b> next<br>
<b>(gdb)</b> n
</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>(lldb)</b> thread step-inst<br>
<b>(lldb)</b> si<br>
</td>
<td class="content">
<b>(gdb)</b> stepi<br>
<b>(gdb)</b> si
</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>(lldb)</b> thread step-inst-over<br>
</td>
<td class="content">
<b>(gdb)</b> nexti<br>
<b>(gdb)</b> ni
</td>
</tr>
<tr><td class="header" colspan="2">Step out of the currently selected frame.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> thread step-out<br>
<b>(lldb)</b> finish<br>
</td>
<td class="content">
<b>(gdb)</b> finish<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%">LLDB</td>
<td class="hed" width="50%">GDB</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>(lldb)</b> breakpoint set --name main<br>
<b>(lldb)</b> breakpoint set -n main<br>
<b>(lldb)</b> b main
</td>
<td class="content">
<b>(lldb)</b> break 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>(lldb)</b> breakpoint set --file test.c --line 12<br>
<b>(lldb)</b> breakpoint set -f test.c -l 12<br>
<b>(lldb)</b> b test.c:12
</td>
<td class="content">
<b>(lldb)</b> break 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>(lldb)</b> breakpoint set --method main<br>
<b>(lldb)</b> breakpoint set -M main<br>
</td>
<td class="content">
<b>(lldb)</b> break main<br>
<i>(Hope that there are no C funtions named <b>main</b>)</i>.
</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>(lldb)</b> breakpoint set --selector count<br>
<b>(lldb)</b> breakpoint set -S count<br>
</td>
<td class="content">
<b>(lldb)</b> break count<br>
<i>(Hope that there are no C or C++ funtions named <b>count</b>)</i>.
</td>
</tr>
</table>
<p>
</div>
<div class="postfooter"></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%">LLDB</td>
<td class="hed" width="50%">GDB</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>(lldb)</b> frame variable<br>
</td>
<td class="content">
<b>(gdb)</b> info args<br>
and<br>
<b>(gdb)</b> info locals<br>
</td>
</tr>
<tr><td class="header" colspan="2">Show the stack backtrace for the current thread.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> thread backtrace<br>
<b>(lldb)</b> bt<br>
</td>
<td class="content">
<b>(gdb)</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>(lldb)</b> thread backtrace all<br>
<b>(lldb)</b> bt all
</td>
<td class="content">
<b>(gdb)</b> thread apply all bt
</td>
</tr>
<tr><td class="header" colspan="2">Show all thread registers.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> register read
</td>
<td class="content">
<b>(gdb)</b> info all-registers
</td>
</tr>
<tr><td class="header" colspan="2">Show the values for the thread registers name "rax", "rsp" and "rbp".</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> register read rax rsp rbp
</td>
<td class="content">
<b>(gdb)</b> info all-registers rax rsp rbp
</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>(lldb)</b> memory read --size 4 --format x --count 4 0xbffff3c0<br>
<b>(lldb)</b> memory read -s4 -fx -c4 0xbffff3c0<br>
<b>(lldb)</b> x -s4 -fx -c4 0xbffff3c0
</td>
<td class="content">
<b>(gdb)</b> x/4xw 0xbffff3c0
</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" colspan=2>
<b>(lldb)</b> memory read --outfile /tmp/mem.txt --count 512 0xbffff3c0<br>
<b>(lldb)</b> memory read -o/tmp/mem.txt -c512 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"colspan=2>
<b>(lldb)</b> memory read --outfile /tmp/mem.bin --binary 0x1000 0x1200<br>
<b>(lldb)</b> memory read -o /tmp/mem.bin -b 0x1000 0x1200<br>
</td>
</tr>
<tr><td class="header" colspan="2">Disassemble the current function for the current frame.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> disassemble --frame<br>
<b>(lldb)</b> disassemble -f
</td>
<td class="content">
<b>(gdb)</b> disassemble
</td>
</tr>
<tr><td class="header" colspan="2">Disassemble any functions named <b>main</b>.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> disassemble --name main<br>
<b>(lldb)</b> disassemble -n main
</td>
<td class="content">
<b>(gdb)</b> disassemble main
</td>
</tr>
<tr><td class="header" colspan="2">Disassemble an address range.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> disassemble --start-address 0x1eb8 --end-address 0x1ec3<br>
<b>(lldb)</b> disassemble -s 0x1eb8 -e 0x1ec3<br>
</td>
<td class="content">
<b>(gdb)</b> disassemble 0x1eb8 0x1ec3
</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">
<b>(lldb)</b> disassemble --frame --mixed<br>
<b>(lldb)</b> disassemble -f -m
</td>
<td class="content">
n/a
</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">
<b>(lldb)</b> disassemble --frame --bytes<br>
<b>(lldb)</b> disassemble -f -b
</td>
<td class="content">
n/a
</td>
</tr>
<tr><td class="header" colspan="2">Disassemble the current source line for the current frame.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> disassemble --line<br>
<b>(lldb)</b> disassemble -l
</td>
<td class="content">
n/a
</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%">LLDB</td>
<td class="hed" width="50%">GDB</td>
</tr>
<tr><td class="header" colspan="2">List the main executable and all dependent shared libraries.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> image list<br>
</td>
<td class="content">
<b>(gdb)</b> info shared<br>
</td>
</tr>
<tr><td class="header" colspan="2">Lookup information for a raw address in the executable or any shared libraries.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> image lookup --address 0x1ec4<br>
<b>(lldb)</b> image lookup -a 0x1ec4<br>
</td>
<td class="content">
<b>(gdb)</b> info symbol 0x1ec4<br>
</td>
</tr>
<tr><td class="header" colspan="2">Lookup information for an address in <b>a.out</a> only.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> image lookup --address 0x1ec4 a.out<br>
<b>(lldb)</b> image lookup -a 0x1ec4 a.out<br>
</td>
<td class="content">
</td>
</tr>
<tr><td class="header" colspan="2">Lookup information for for a type <code>Point</code> by name.</td></tr>
<tr>
<td class="content">
<b>(lldb)</b> image lookup --type Point<br>
<b>(lldb)</b> image lookup -t Point<br>
</td>
<td class="content">
<b>(lldb)</b> ptype 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>(lldb)</b> image dump sections<br>
</td>
<td class="content">
<b>(gdb)</b> maintenance info 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">
<b>(lldb)</b> image dump sections a.out<br>
</td>
<td class="content">
</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">
<b>(lldb)</b> image dump symtab<br>
</td>
<td class="content">
</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">
<b>(lldb)</b> image dump symtab a.out liba.so<br>
</td>
<td class="content">
</td>
</tr>
</table>
<p>
</div>
<div class="postfooter"></div>
<p>
</div>
</div>
</div>
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