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<title>highlight.gdb</title>
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GNU gdb (GDB) 8.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from your_application...done.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">break</span><span style="color:#644a9b"> main</span>
<span style="color:#898887"># this is a comment</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">run</span><span style="color:#644a9b"> <arguments for your application></span>
...
Breakpoint 1 at 0x400b56: file yourmain.cpp, line 3
3: int main(int argc, char* argv[])
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">continue</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">backtrace</span>
#0 0x7f59e39bf18d in <span style="color:#644a9b;font-weight:bold">poll</span> () from<span style="color:#0057ae"> /usr/lib/libc.so.6</span>
#1 0x7f59df6c8c7c in <span style="color:#644a9b;font-weight:bold">??</span> () from<span style="color:#0057ae"> /usr/lib/libglib-2.0.so.0</span>
#2 0x7f59df6c8d8c in <span style="color:#644a9b;font-weight:bold">g_main_context_iteration</span> () from<span style="color:#0057ae"> /usr/lib/libglib-2.0.so.0</span>
#3 0x7f59e480b23f in <span style="color:#006e28">QEventDispatcherGlib::</span><span style="color:#644a9b;font-weight:bold">processEvents</span>(...)
from<span style="color:#0057ae"> /usr/lib/libQt5Core.so.5</span>
...
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">where</span>
#0 <span style="color:#644a9b;font-weight:bold">main</span> (argc=1, argv=0x7fffffffca88) at<span style="color:#0057ae"> ../../debugging/ex_debugger/main.cpp</span>:11
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">list</span>
10 bool run = true;
11 while (run) {
12 // infinite loop! can you make it quit?
13 }
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">info</span><span style="color:#644a9b"> locals</span>
app = <incomplete type>
run = true
complexData = {{d = 0x61d430, e = 0x61d430}}
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">info</span><span style="color:#644a9b"> scope main.cpp:12</span>
Scope for main.cpp:12:
Symbol argc is a variable at frame base reg $rbp offset 0+-8, length 4.
Symbol argv is a variable at frame base reg $rbp offset 0+-16, length 8.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">ptype</span><span style="color:#644a9b"> run</span>
type = bool
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> run</span>
run = true
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">set</span><span style="color:#644a9b"> run = false</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> run</span>
run = false
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> myString.size()</span>
42
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">ptype</span><span style="color:#644a9b"> MyType</span>
type = class MyType {
private:
int foo;
public:
int foo() const;
...
}
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">break</span><span style="color:#644a9b"> QMessageLogger::warning</span>
Breakpoint 1 at 0x7ffff6f143f0 (8 locations)
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">command</span><span style="color:#644a9b"> 1</span>
Type commands for breakpoint(s) 1, one per line.
End with a line saying just \"end\".
<span style="color:#644a9b">> </span><span style="font-weight:bold">backtrace</span>
<span style="color:#644a9b">> </span><span style="font-weight:bold">continue</span>
<span style="color:#644a9b">> </span><span style="font-weight:bold">end</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">catch</span><span style="color:#644a9b"> throw </span><span style="color:#898887"># or when an exception is thrown</span>
Catchpoint 2 (throw)
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">break</span><span style="color:#644a9b"> main.cpp:12 </span><span style="color:#898887"># or when certain code is executed</span>
Breakpoint 3 at 0x401216: file ../../debugging/ex_debugger/main.cpp, line 12.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">info</span><span style="color:#644a9b"> breakpoints</span>
Num Type Disp Enb Address What
1 breakpoint keep y <MULTIPLE>
1.1 y 0x7ffff6f143f0 <QMessageLogger::warning(char const*, …
...
2 breakpoint keep y 0x7ffff66d9b90 exception throw
3 breakpoint keep y 0x000000401216 in main(int, char**)
at debugging/ex_debugger/main.cpp:12
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">condition</span><span style="color:#644a9b"> 3 argc > 5</span>
<span style="color:#898887"># ^-- breakpoint id, see `info breakpoints` above</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">call</span><span style="color:#644a9b"> myFunction()</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">set</span><span style="color:#644a9b"> pagination off</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">set</span><span style="color:#644a9b"> logging file /tmp/warnings.log</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">set</span><span style="color:#644a9b"> logging on</span>
Copying output to /tmp/warnings.log.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">info</span><span style="color:#644a9b"> threads</span>
Id Target Id Frame
2 Thread 0x7fffe10e1700 (LWP 7271) \"QXcbEventReader\"
0x7ffff0b6718d in poll () from /usr/lib/libc.so.6
* 1 Thread 0x7ffff7edd840 (LWP 7267) \"kwrite\"
0x7ffff0b6718d in poll () from /usr/lib/libc.so.6
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">thread</span>
<span style="color:#b08000">[Current thread is 1 (Thread 0x7ffff7edd840 (LWP 7267))]</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">thread</span><span style="color:#644a9b"> 2</span>
[Switching to thread 2 (Thread 0x7fffe10e1700 (LWP 9765))]
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">thread</span><span style="color:#644a9b"> apply all backtrace</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">info</span><span style="color:#644a9b"> sharedlibrary</span>
From To Syms Read Shared Object Library
0x7ffff7ddbb80 0x7ffff7df5610 Yes (*) /lib64/ld-linux-x86-64.so.2
0x7ffff7690460 0x7ffff7ab723c Yes /opt/qt/5.5/gcc_64/lib/libQt5Gui.so.5
0x7ffff6efdb80 0x7ffff71af318 Yes /opt/qt/5.5/gcc_64/lib/libQt5Core.so.5
0x7ffff6c02f60 0x7ffff6c5f852 Yes (*) /usr/lib/libGL.so.1
0x7ffff69d3ac0 0x7ffff69e0931 Yes (*) /usr/lib/libpthread.so.0
0x7ffff66d5fa0 0x7ffff6781d89 Yes /usr/lib/libstdc++.so.6
0x7ffff6353510 0x7ffff63bb33a Yes (*) /usr/lib/libm.so.6
...
(*): Shared library is missing debugging information.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">list</span><span style="color:#644a9b"> 64</span>
59 * If no red can be seen, then the cached implementation is \"good enough\".
60 */
61 void paintEvent(QPaintEvent *event)
62 {
63 const QRect rect = event->rect();
64
65 QPainter painter(this);
66 painter.setRenderHint(QPainter::Antialiasing);
67 painter.fillRect(rect, Qt::black);
68
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">dprintf</span><span style="color:#644a9b"> main.cpp:64,\"paint rect(w=%d,h=%d)\\n\",rect.width(),rect.height()</span>
Dprintf 1 at 0x403a1e: file path/to/main.cpp, line 64.
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">continue</span>
Continuing.
paint rect(w=202,h=200)
paint rect(w=213,h=203)
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">target</span><span style="color:#644a9b"> remote <device ip>:<port></span>
Remote debugging using <device ip>:<port>
Reading /lib64/ld-linux-x86-64.so.2 from remote target...
warning: File transfers from remote targets can be slow.
Use \"set sysroot\"to access files locally instead.
...
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">set</span><span style="color:#644a9b"> sysroot /path/to/sysroot</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> myMap</span>
$1 = QMap<QString, int> = {
[\"bar\"] = 1,
[\"foo\"] = 2
}
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> money</span>
$1 {
{value = 1.20000005, currency = Money::Euro},
{value = 3.4000001, currency = Money::Dollar}
}
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">python</span>
<span style="color:#ca60ca">></span> <span style="color:#ff5500">import</span> sys
<span style="color:#ca60ca">></span> sys.path.insert(<span style="color:#b08000">0</span>, <span style="color:#bf0303">'/path/to/addon/debugging/ex_gdb_pretty_printer'</span>)
<span style="color:#ca60ca">></span> <span style="color:#ff5500">import</span> money_printer
<span style="color:#ca60ca">></span> <span style="font-weight:bold">end</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">print</span><span style="color:#644a9b"> money</span>
$2 = {
\"1.200000 Euro\",
\"3.400000 Dollar\"
}
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">continue</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">detach</span>
<span style="color:#644a9b">(gdb) </span><span style="font-weight:bold">quit</span>
</pre></body></html>
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