> These days, almost every C++ compiler uses the Itanium C++ ABI’s name mangling rules. The notable exception is MSVC, which uses a completely different format.

You stay classy, Microsoft.

> Its not just the grammar that’s huge, the symbols themselves are too. Here is a pretty big mangled C++ symbol from SpiderMonkey [...] That’s 355 bytes!

Here's a >4kB symbol I encountered while liberating some ebooks from an abandoned DRM app:

tetraphilia::transient_ptrs<tetraphilia::imaging_model::PixelProducer<T3AppTraits> >::ptr_type tetraphilia::imaging_model::MakeIdealPixelProducer<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 1ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 0ul> > > >, tetraphilia::TypeList<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 0ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 0ul> > > >, tetraphilia::TypeList<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 1ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> > > >, tetraphilia::Terminal> >, T3AppTraits, tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, tetraphilia::imaging_model::SeparableOperation<tetraphilia::imaging_model::ClipOperation<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> > > >(tetraphilia::ArgType<tetraphilia::TypeList<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 1ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 0ul> > > >, tetraphilia::TypeList<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 0ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::OneXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 0ul> > > >, tetraphilia::TypeList<tetraphilia::imaging_model::XWalkerCluster<tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalkerList3<tetraphilia::imaging_model::const_UnifiedGraphicXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits>, 0ul, 0, 1ul, 0ul, 0, 0ul, 0ul, 0, 0ul, 1ul>, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> >, tetraphilia::imaging_model::GraphicXWalker<tetraphilia::imaging_model::const_IgnoredRasterXWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 0ul, 0, 1ul, 1ul>, tetraphilia::imaging_model::const_SpecializedRasterXWalker<unsigned char, 2ul, -1, 3ul, 3ul> > > >, tetraphilia::Terminal> > > >, T3AppTraits::context_type&, tetraphilia::imaging_model::Constraints<T3AppTraits> const&, tetraphilia::imaging_model::SeparableOperation<tetraphilia::imaging_model::ClipOperation<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> > >, tetraphilia::imaging_model::const_GraphicYWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> > const*, tetraphilia::imaging_model::const_GraphicYWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> > const*, tetraphilia::imaging_model::const_GraphicYWalker<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> > const*, tetraphilia::imaging_model::SegmentFactory<tetraphilia::imaging_model::ByteSignalTraits<T3AppTraits> >*)