pycxxfilt

Demangle C++ symbols using LLVM's IA-64 C++ ABI demangler.

pycxxfilt is a Python C extension that wraps the C++ name demangler from LLVM's libcxxabi. It handles the name mangling scheme defined by the Itanium C++ ABI, which is the standard used by GCC (3.0+), Clang (1.0+), and other compilers on most platforms. The demangler source is 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("_ZN3Foo3barEv")    # 'Foo::bar()'
pycxxfilt.demangle("_ZSt4cout")        # 'std::cout'
pycxxfilt.demangle("not_mangled")      # None

demangle() returns the demangled name as a string, or None if the input is not a valid mangled symbol.

Command line

$ python -m pycxxfilt _Z3fooi _ZN3Foo3barEv _ZSt4cout not_mangled
foo(int)
Foo::bar()
std::cout
not_mangled

Symbols that are not valid mangled names are printed as-is.

Supported standards

The demangler decodes any symbol produced by a conforming Itanium C++ ABI compiler (GCC, Clang). Coverage tracks the bundled LLVM version and currently includes:

Standard	Covered constructs
C++98/03	namespaces, templates, operator overloads, ctors/dtors, vtables/RTTI, dynamic exception specs
C++11	lambdas, variadic templates, rvalue references, `decltype`, user-defined literals, `noexcept`
C++14	`decltype(auto)`, variable and generic-lambda templates
C++17	fold expressions, structured bindings, `noexcept` in the type system
C++20	concepts / `requires`, modules, coroutines, `char8_t`, `<=>`
C++23	explicit object parameter ("deducing this")
C++26	pack indexing (`T...[N]`)

Beyond C++, it also handles C23 _BitInt(N) and extended floating-point types (_Float16, __float128), Objective-C++ protocol qualifiers, GNU/Clang vector types, ABI tags ([abi:...]), and GCC symbol suffixes (.cold, .clone).

Stability

The public API is pycxxfilt.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, and it is not available on Windows.

pycxxfilt takes a different approach: it ships a vendored copy of LLVM's __cxa_demangle implementation and compiles it into a C extension module. This makes it self-contained with no runtime dependency on any system C++ library, and it works on Linux, macOS, and Windows.

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.

Release files for pycxxfilt 1.0.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for pycxxfilt 1.0.0
File	Size	Uploaded
pycxxfilt-1.0.0.tar.gz	660.3 kB	Sep 1, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for pycxxfilt 1.0.0
File	Interpreter	ABI	Platform	Reset
pycxxfilt-1.0.0-cp314-cp314t-win_amd64.whl 63.5 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Windows x86-64	Details
pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl 1.1 MB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ x86-64	Details
pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_s390x.whl 1.3 MB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ IBM System/390x	Details
pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_ppc64le.whl 1.1 MB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ PowerPC 64-le	Details
pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl 1.1 MB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux musl 1.2+ ARM64	Details
pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 82.0 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_s390x.manylinux_2_28_s390x.whl 87.6 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.28+ IBM System/390x, Linux glibc 2.24+ IBM System/390x	Details
pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_ppc64le.manylinux_2_28_ppc64le.whl 87.3 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.28+ PowerPC 64-le, Linux glibc 2.24+ PowerPC 64-le	Details
pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 80.0 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64	Details
pycxxfilt-1.0.0-cp314-cp314t-macosx_11_0_arm64.whl 70.5 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 11.0+ ARM64	Details
pycxxfilt-1.0.0-cp314-cp314t-macosx_10_15_x86_64.whl 72.2 kB Sep 1, 2026	CPython 3.14	CPython 3.14 free-threading	macOS 10.15+ x86-64	Details
pycxxfilt-1.0.0-cp311-abi3-win_amd64.whl 62.2 kB Sep 1, 2026	CPython 3.11	abi3	Windows x86-64	Details
pycxxfilt-1.0.0-cp311-abi3-musllinux_1_2_x86_64.whl 1.1 MB Sep 1, 2026	CPython 3.11	abi3	Linux musl 1.2+ x86-64	Details
pycxxfilt-1.0.0-cp311-abi3-musllinux_1_2_s390x.whl 1.3 MB Sep 1, 2026	CPython 3.11	abi3	Linux musl 1.2+ IBM System/390x	Details
pycxxfilt-1.0.0-cp311-abi3-musllinux_1_2_ppc64le.whl 1.1 MB Sep 1, 2026	CPython 3.11	abi3	Linux musl 1.2+ PowerPC 64-le	Details
pycxxfilt-1.0.0-cp311-abi3-musllinux_1_2_aarch64.whl 1.1 MB Sep 1, 2026	CPython 3.11	abi3	Linux musl 1.2+ ARM64	Details
pycxxfilt-1.0.0-cp311-abi3-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl 81.8 kB Sep 1, 2026	CPython 3.11	abi3	Linux glibc 2.28+ x86-64, Linux glibc 2.24+ x86-64	Details
pycxxfilt-1.0.0-cp311-abi3-manylinux_2_24_s390x.manylinux_2_28_s390x.whl 87.4 kB Sep 1, 2026	CPython 3.11	abi3	Linux glibc 2.24+ IBM System/390x, Linux glibc 2.28+ IBM System/390x	Details
pycxxfilt-1.0.0-cp311-abi3-manylinux_2_24_ppc64le.manylinux_2_28_ppc64le.whl 87.1 kB Sep 1, 2026	CPython 3.11	abi3	Linux glibc 2.28+ PowerPC 64-le, Linux glibc 2.24+ PowerPC 64-le	Details
pycxxfilt-1.0.0-cp311-abi3-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl 79.9 kB Sep 1, 2026	CPython 3.11	abi3	Linux glibc 2.24+ ARM64, Linux glibc 2.28+ ARM64	Details
pycxxfilt-1.0.0-cp311-abi3-macosx_11_0_arm64.whl 70.4 kB Sep 1, 2026	CPython 3.11	abi3	macOS 11.0+ ARM64	Details
pycxxfilt-1.0.0-cp311-abi3-macosx_10_9_x86_64.whl 71.8 kB Sep 1, 2026	CPython 3.11	abi3	macOS 10.9+ x86-64	Details

Total release size: 10.9 MB

Release files / pycxxfilt-1.0.0.tar.gz

Download URL	pycxxfilt-1.0.0.tar.gz
Size	660.3 kB
Tags	Source
SHA-256 checksum How to use checksums	`e89dea4d20a3ec94d8cac3a746502154e7a62f2ddea3534c8dbf2fb9b1a37802`
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-win_amd64.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-win_amd64.whl
Size	63.5 kB
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Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_x86_64.whl
Size	1.1 MB
Tags	CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ x86-64
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Release files / pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_s390x.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_s390x.whl
Size	1.3 MB
Tags	CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ IBM System/390x
SHA-256 checksum How to use checksums	`986ef32c717626f88381c16117cd02802aac0a72b743d035132d2c31594a8c09`
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_ppc64le.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_ppc64le.whl
Size	1.1 MB
Tags	CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ PowerPC 64-le
SHA-256 checksum How to use checksums	`ca3fed552744277f22462e750667e8f6635353642784c47c5d850d96829dacfe`
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Publishing platform: GitHub Actions
Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-musllinux_1_2_aarch64.whl
Size	1.1 MB
Tags	CPython 3.14 CPython 3.14 free-threading Linux musl 1.2+ ARM64
SHA-256 checksum How to use checksums	`50c5da69f498bcf1215957699b9b0fb54e735473b316e23fc39d6b13921745c8`
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Publishing repository: github.com/tiran/pycxxfilt
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Release files / pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
Size	82.0 kB
Tags	CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ x86-64 Linux glibc 2.28+ x86-64
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Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_s390x.manylinux_2_28_s390x.whl

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Size	87.6 kB
Tags	CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ IBM System/390x Linux glibc 2.28+ IBM System/390x
SHA-256 checksum How to use checksums	`8ef4029a962c538e706813175b7f28ba993fc4cb48a9a28872993051f7d35108`
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Publishing repository: github.com/tiran/pycxxfilt
Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_ppc64le.manylinux_2_28_ppc64le.whl

Download URL	pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_ppc64le.manylinux_2_28_ppc64le.whl
Size	87.3 kB
Tags	CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ PowerPC 64-le Linux glibc 2.28+ PowerPC 64-le
SHA-256 checksum How to use checksums	`64530313a7182471f5895aa7459b5f953ccb593b2c7731103aa8ee3f609f6021`
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Publishing repository: github.com/tiran/pycxxfilt
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Download URL	pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl
Size	80.0 kB
Tags	CPython 3.14 CPython 3.14 free-threading Linux glibc 2.24+ ARM64 Linux glibc 2.28+ ARM64
SHA-256 checksum How to use checksums	`e7e55a5ee0fca9f360328f2aac417c69be39b2cf9fcb152f6616493ab8be6f5a`
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release files / pycxxfilt-1.0.0-cp311-abi3-macosx_11_0_arm64.whl

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Release files / pycxxfilt-1.0.0-cp311-abi3-macosx_10_9_x86_64.whl

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Publishing commit: github.com/tiran/pycxxfilt/tree/f5d522d191f6051638b77c1ad50c7651b9883fee

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Release history Release notifications | RSS feed

1.1.0

Sep 21, 2026 23 release files

This release

1.0.0 This release

Sep 1, 2026 23 release files

0.2.0

Aug 31, 2026 23 release files

0.1.0

Apr 19, 2026 12 release files

pycxxfilt 1.0.0

pycxxfilt

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Release files / pycxxfilt-1.0.0-cp314-cp314t-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl

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