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Add an c++ itanium demangler to llvm.
Audit RequiredrL280732

Description

Add an c++ itanium demangler to llvm.

This adds a copy of the demangler in libcxxabi.

The code also has no dependencies on anything else in LLVM. To enforce
that I added it as another library. That way a BUILD_SHARED_LIBS will
fail if anyone adds an use of StringRef for example.

The no llvm dependency combined with the fact that this has to build
on linux, OS X and Windows required a few changes to the code. In
particular:

No constexpr.
No alignas

On OS X at least this library has only one global symbol:
__ZN4llvm16itanium_demangleEPKcPcPmPi

My current plan is:

Commit something like this
Change lld to use it
Change lldb to use it as the fallback

Add a few #ifdefs so that exactly the same file can be used in
libcxxabi to export abi::__cxa_demangle.

Once the fast demangler in lldb can handle any names this
implementation can be replaced with it and we will have the one true
demangler.

Details

Auditors
Bigcheese
Committed
rafaelSep 6 2016, 12:16 PM
Parents
rL280731: clang-format: [JS] whitespace required between ! and as.
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