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Add cppdemangle in druntime #3002

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Add cppdemangle in druntime #3002

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Commits on Apr 22, 2020

  1. Add cppdemangle in druntime 

    Having a C++ symbol demangler is very useful, with this it will
be possible to implement the C++ symbol demangle in the stacktrace.

The demangling is done in Posix platform by function __cxa_demangle
presents in Itanium C++ ABI (https://itanium-cxx-abi.github.io/cxx-abi/abi.html#demangler).

Itanium C++ ABI is used practically in all modern C++ compilers on Posix,
however old compilers (like GCC < 3.0) used a different name mangling,
this is not a problem because DMD in fact only supports Itanium C++ ABI on Posix.

For Windows instead the implementation it is provided by the UnDecorateSymbolName
function present in the Debug Help Library.
(https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-undecoratesymbolname)

Signed-off-by: Ernesto Castellotti <[email protected]>
    Ernesto Castellotti committed Apr 22, 2020
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