How to "decrypt" linker method names?

Question

I'm using backtrace to print application's stack trace and I'm getting something like

libQtCore.so.4(_ZN11QMetaObject8activateEP7QObjectPKS_iPPv+0x843) [0x7f889d20cf33]
libQtGui.so.4(_ZN7QAction9triggeredEb+0x32) [0x7f889d76c2f2]
libQtGui.so.4(_ZN7QAction8activateENS_11ActionEventE+0xb0) [0x7f889d76d670]
libQtGui.so.4(+0x6242f4) [0x7f889db862f4]

Is there any way to convert "linker-names" to "source-names" and get code line numbers from offsets?

I want to have backtrace, looking like this:

libQtCore.so.4 (QMetaObject::activate(QObject):1022)
libQtGui.so.4  (QAction::triggered()::47)

UPD.

I understand, this technique may work or not work or work bad because of compiler specifics. I want to "demangle" linker symbols at least in gcc and visual c++.

@fjardon , can I use this method from source code? Is there any char * s = cpp_filt(MyStackString); — Arenim, Dec 08 '11 at 16:11
@fjardon, c++filt will only work with gcc names, while MSVS or any other compiler may use different rules. — Sergiy Belozorov, Dec 08 '11 at 16:14
@Arenim, c++filt is a command line tool for Linux. It is not a function. — Sergiy Belozorov, Dec 08 '11 at 16:17
Yes, i see. It works for me, but I'm sure, it uses some library, capable for usage in application, right? — Arenim, Dec 08 '11 at 16:18
@Arenim: I'd look into source code if you need it that badly :). — Sergiy Belozorov, Dec 13 '11 at 22:34
"it uses some library, capable for usage in application" I think what you want is this: https://stackoverflow.com/a/4779945/1422630 — Aquarius Power, Jul 11 '18 at 16:00

score 6 · Accepted Answer · answered Dec 08 '11 at 16:30

6

Under gcc you can use c++filt to decipher the mangling.
Under Visual studio you can undname

Once you have the function name you at least on Windows you can use DIA SDK to get the source file line numbers etc

answered Dec 08 '11 at 16:30

parapura rajkumar

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score 2 · Answer 2 · answered Dec 08 '11 at 16:12

2

This is called name mangling. Read the article on Wikipedia please, since citing it here would be too much for an answer.

answered Dec 08 '11 at 16:12

Sergiy Belozorov

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How to "decrypt" linker method names?

2 Answers2