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.

llvm-svn: 280732

1 files changed, 1 insertions, 4 deletions

diff --git a/llvm/test/tools/llvm-objdump/X86/macho-symbolized-disassembly.test b/llvm/test/tools/llvm-objdump/X86/macho-symbolized-disassembly.test
index 6f49b456227..699a416a983 100644
--- a/llvm/test/tools/llvm-objdump/X86/macho-symbolized-disassembly.test
+++ b/llvm/test/tools/llvm-objdump/X86/macho-symbolized-disassembly.test
@@ -31,10 +31,7 @@ ObjC-EXE: 0000000100000f1b	movq	0x10e(%rip), %rsi       ## Objc selector ref: da
 ObjC-EXE: 0000000100000f25	callq	0x100000f4a             ## Objc message: +[NSDate date]
 ObjC-EXE: 0000000100000f33	callq	0x100000f44             ## symbol stub for: _NSLog
 
-CXX-EXE: 00000001000014cb	callq	__ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_
-
-// FIXME: Demangler depends on host's <cxxabi.h>.
-// std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char)
+CXX-EXE: 00000001000014cb	callq	__ZNSt3__116__pad_and_outputIcNS_11char_traitsIcEEEENS_19ostreambuf_iteratorIT_T0_EES6_PKS4_S8_S8_RNS_8ios_baseES4_ ## std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> > std::__1::__pad_and_output<char, std::__1::char_traits<char> >(std::__1::ostreambuf_iterator<char, std::__1::char_traits<char> >, char const*, char const*, char const*, std::__1::ios_base&, char)
 
 i386-OBJ: 0000002f	calll	_printf