ircd::mods: Add cxx abi name demangling.

include/ircd/mods.h

@@ -129,6 +129,9 @@ struct import_shared
 	import_shared(const std::string &modname, const std::string &symname);
 };
 
+
+std::string demangle(const std::string &symbol);
+
 std::string postfixed(const std::string &name);
 std::string unpostfixed(const std::string &name);
 
@@ -158,6 +161,7 @@ namespace ircd {
 using mods::module;                              // Bring struct module into main ircd::
 using mods::import;
 using mods::import_shared;
+using mods::demangle;
 
 } // namespace ircd
 

ircd/mods.cc

@@ -24,6 +24,7 @@
  *  USA
  */
 
+#include <cxxabi.h>
 #include <boost/filesystem.hpp>
 #include <boost/dll.hpp>
 
@@ -582,6 +583,29 @@ ircd::mods::prefix_if_relative(const filesystem::path &path)
 	return path.is_relative()? (modroot / path) : path;
 }
 
+std::string
+ircd::mods::demangle(const std::string &symbol)
+{
+	size_t len;
+	int status;
+	const custom_ptr<char> buf
+	{
+		abi::__cxa_demangle(symbol.c_str(), nullptr, &len, &status),
+		std::free
+	};
+
+	switch(status)
+	{
+		case 0:   break;
+		case -1:  throw error("Demangle failed -1: memory allocation failure");
+		case -2:  throw error("Demangle failed -2: mangled name is not valid");
+		case -3:  throw error("Demangle failed -3: invalid argument");
+		default:  throw error("Demangle failed %d: unknown error", status);
+	}
+
+	return { buf.get(), len };
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 // mod (internal)