There is a new project at:
This is libc++abi, and is meant to be the low-level, Itanium ABI (http://www.codesourcery.com/public/cxx-abi/) implementation for libc++. There isn't much in there right now (additions welcome!). So far all that is in there is a demangler (__cxa_demangle).
The demangler has been split into three lower-level API's:
__demangle(const char* mangled_name, char* buf, size_t bs)
__demangle(const char* mangled_name);
__demangle(__demangle_tree dmg_tree, char* buf, size_t* n, int* status);
The first two functions take a mangled name as input and output a __demangle_tree. This is the "parsing part" of demangling. The reason for two functions here is so that you can optionally pass in a buffer, which if large enough, will be used instead of allocating memory for the __demangle_tree.
The third function takes the __demangle_tree, and outputs an unmangled name.
Using this low-level API, __cxa_demangle becomes a trivial wrapper above this API:
__cxa_demangle(const char* mangled_name, char* buf, size_t* n, int* status)
if (mangled_name == NULL || (buf != NULL && n == NULL))
*status = __libcxxabi::invalid_args;
const size_t bs = 64 * 1024;
buf = __libcxxabi::__demangle(__libcxxabi::__demangle(mangled_name,
buf, n, status);
It is expected that some tools (compilers, debuggers) will want to make use of an API on __demangle_tree that has yet to be developed. E.g. how many function arguments and what are they? How many template arguments and what are they? etc.