pycxxfilt
Demangle C++ and Rust symbols using LLVM's demanglers.
pycxxfilt is a Python C extension that wraps LLVM's standalone demangle
engines. It handles three name-mangling schemes:
- the Itanium C++ ABI
(
_Z...), used by GCC (3.0+), Clang, and other compilers on most platforms - MSVC (Microsoft,
?...), the scheme used by the Visual C++ toolchain - Rust v0 (
_R...)
The demangler sources are shipped directly, so no external C++ libraries are required at build time or runtime.
The bundled demangler is from LLVM release 23.1.0.
Installation
pip install pycxxfilt
Wheels are available for Linux (x86_64, aarch64, ppc64le, s390x), macOS (x86_64, arm64), and Windows (AMD64). The extension uses the Python stable ABI (abi3), so a single wheel works with Python 3.11 and later.
Usage
Python API
import pycxxfilt
pycxxfilt.demangle("_Z3fooi") # 'foo(int)'
pycxxfilt.demangle("?foo@Tensor@at@@QEAAXXZ") # 'public: void __cdecl at::Tensor::foo(void)'
pycxxfilt.demangle("_RNvC6_123foo3bar") # '123foo::bar'
pycxxfilt.demangle("not_mangled") # None
demangle() auto-detects the flavor by prefix (? -> MSVC, _R -> Rust,
otherwise Itanium) and returns the demangled name, or None if the input is
not a valid mangled symbol. To force a specific engine, call
itanium_demangle(), msvc_demangle(), or rust_demangle() directly.
Since 1.2.0, demangle() accepts an Itanium symbol carrying a trailing GNU
symbol version (name@VERSION or the default name@@VERSION, as emitted by
nm/readelf); the version is split off and re-appended to the result:
pycxxfilt.demangle("_Z3fooi@@GLIBCXX_3.4") # 'foo(int)@@GLIBCXX_3.4'
This only applies to the auto-detecting demangle(). The flavor-specific
itanium_demangle() stays strict and rejects a @ suffix, and the suffix is
never stripped on the MSVC path, where @ is a structural separator.
All functions raise TypeError for non-string input and ValueError when the
input carries a flavor's prefix but fails to demangle. Because the demanglers
are NUL-terminated C APIs, a string containing an embedded NUL byte (\0) is
rejected with ValueError rather than being silently truncated.
Command line
$ python -m pycxxfilt _Z3fooi "?x@@3HA" _RNvC1a4main not_mangled
foo(int)
int x
a::main
not_mangled
Symbols that are not valid mangled names are printed as-is.
Supported formats
Two C++ ABIs are decoded — Itanium (_Z, GCC/Clang, itanium_demangle()) and
MSVC (?, msvc_demangle()). Coverage tracks the bundled LLVM version.
✅ supported, ❌ not decoded, n/a means the construct does not exist in that ABI.
| Standard | Itanium | MSVC | Feature |
|---|---|---|---|
| C++98/03 | ✅ | ✅ | namespaces, templates, operator overloads, ctors/dtors, vtables/RTTI |
| C++11 | ✅ | ✅ | lambdas, rvalue references, ref-qualifiers, variadic templates, user-defined literals |
| C++14 | ✅ | ✅ | decltype(auto) / deduced return types, variable and generic-lambda templates |
| C++17 | ✅ | ✅ | noexcept in the type system |
| C++20 | ✅ | ✅ | char8_t, operator<=>, co_await |
| C++20 | ✅ | ❌ | concepts / requires, modules, coroutines |
| C++23 | ✅ | ❌ | explicit object parameter ("deducing this") |
| C++26 | ✅ | ❌ | pack indexing (T...[N]) |
| Extension | ✅ | n/a | C23 _BitInt(N), extended FP (_Float16, __float128) |
| Extension | ✅ | n/a | Objective-C++ protocol qualifiers, GNU/Clang vector types |
| Extension | ✅ | n/a | ABI tags ([abi:...]), GCC symbol suffixes (.cold, .clone) |
| Extension | n/a | ✅ | all calling conventions (__cdecl, __stdcall, __vectorcall, ...) |
| Extension | n/a | ✅ | RTTI descriptors, vftables/vbtables, thunks |
| Extension | n/a | ✅ | encoded string literals, MD5-hashed names |
Rust (_R, rust_demangle()) decodes the v0 scheme
(RFC 2603):
crate paths, inherent/trait impls, trait definitions, closures/shims, generic
type/const/lifetime arguments, trait objects, const generics, punycode
identifiers, and backreferences. The legacy Rust mangling (_ZN...) is not
decoded as Rust; such names fall through to the Itanium demangler.
Stability
The public API is pycxxfilt.demangle(), the flavor-specific
itanium_demangle() / msvc_demangle() / rust_demangle(), and
pycxxfilt.LLVM_VERSION. From 1.0 onward it follows
semantic versioning: no breaking changes to these
without a major version bump.
Comparison with cxxfilt
The cxxfilt package uses ctypes to
call __cxa_demangle from the system's libstdc++.so. This means it
depends on a C++ runtime library being installed and available at runtime,
it is not available on Windows, and it only handles Itanium C++ names.
pycxxfilt takes a different approach: it ships vendored copies of LLVM's
demangle engines and compiles them into a C extension module. This makes it
self-contained with no runtime dependency on any system C++ library, it works
on Linux, macOS, and Windows, and it demangles MSVC and Rust names in addition
to Itanium C++.
License
The project code is licensed under the Apache License 2.0.
The vendored LLVM demangler is licensed under the Apache License 2.0 with LLVM Exceptions.
1 maintainer
Metadata
1 maintainer
Release files for pycxxfilt 1.2.0
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