|author||Nico Weber <email@example.com>||Tue Nov 13 16:10:37 2018 -0500|
|committer||Nico Weber <firstname.lastname@example.org>||Tue Nov 13 16:10:37 2018 -0500|
demumble demangles both POSIX and Visual Studio symbols. It runs on both POSIX and Windows.
$ demumble _Z4funcPci func(char*, int) $ demumble '?Fx_i@@YAHP6AHH@Z@Z' int __cdecl Fx_i(int (__cdecl *)(int))
There are prebuilt x64 binaries for Linux, Mac (10.9+), and Windows on the releases page.
It has several nice features that c++filt lacks (and lacks many of c++filt's features I never use).
Smart about underscores: C++ symbols have an additional leading underscore on OS X.
operator new is mangled as
_Znw on Linux but
__Znw on Mac. OS X‘s c++filt automatically strips one leading underscore, but Linux’s c++filt doesn't. So if you want to demangle a Linux symbol on OS X, you need to pass
-n to tell it to not strip the underscore, and if you want to demangle an OS X symbol on Linux you likewise need to pass
-_. demumble just does the right thing:
$ c++filt _Znw _Znw $ c++filt __Znw operator new $ demumble _Znw operator new $ demumble __Znw operator new
Smart about filtering: Both c++filt and demumble can work as a stdin filter. demumble only demangles function symbols (which never look like other words), while c++filt defaults to demangling type names too, which are likely to look like regular words. demumble does demangle types when they're passed as args:
$ echo 'I like Pi and _Znw' | c++filt I like int* and _Znw $ echo 'I like Pi and _Znw' | demumble I like Pi and operator new $ c++filt Pi int* $ demumble Pi int*
Cross-platform: demumble runs on Windows. demumble can demangle Windows-style symbols (also when running on non-Windows).
$ demumble '??2@YAPEAX_K@Z' void * __cdecl operator new(unsigned __int64) $ c++filt '??2@YAPEAX_K@Z' ??2@YAPEAX_K@Z
demumble also has a flag to make it print only things that look like symbols. For example, print demangled names of all functions defined in a bitcode file:
$ grep '^define' bitcode-win.ll | demumble -m | head -1 unsigned int __cdecl v8::RoundUpToPowerOfTwo32(unsigned int)
Use cmake to build:
cmake -G Ninja && ninja
Run tests after building:
cxa_demangle.cpp needs more C++11 than Visual Studio 2013 supports, so to build on Windows you need to use Visual Studion 2015 or use clang-cl as C++ compiler like so:
cmake -G Ninja -DCMAKE_CXX_COMPILER=path/to/llvm-build/bin/clang-cl.exe