demumble demangles both Itanium 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))
It can also demangle D, Rust, and Swift symbols.
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
macOS. operator new is mangled as _Znw on Linux but __Znw on Mac. macOS'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 macOS, 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 on macOS defaults to demangling type names too, which are likely
to look like regular words. demumble does demangle types when they're passed
as args without requiring the --types switch that c++filt needs on Linux:
# on macOS:
$ 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*
# on Linux:
$ c++filt Pi
Pi
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
Optionally print only demangled things: 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)
Optionally print both mangled and demangled names:
$ echo _ZN3fooC1Ev _ZN3fooC2Ev | ./demumble -b
"foo::foo()" (_ZN3fooC1Ev) "foo::foo()" (_ZN3fooC2Ev)
Use cmake to build: cmake -G Ninja . && ninja
Run tests after building: python demumble_test.py
cxa_demangle.cpp needs more C++11 than Visual Studio 2013 supports, so
to build on Windows you need to use Visual Studio 2015 or use clang-cl
as C++ compiler like so:
cmake -G Ninja -DCMAKE_CXX_COMPILER=path/to/llvm-build/bin/clang-cl.exe