xref: /freebsd/contrib/llvm-project/llvm/lib/Demangle/Demangle.cpp (revision 093cf790569775b80662926efea6d9d3464bde94)
1 //===-- Demangle.cpp - Common demangling functions ------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file This file contains definitions of common demangling functions.
10 ///
11 //===----------------------------------------------------------------------===//
12 
13 #include "llvm/Demangle/Demangle.h"
14 #include <cstdlib>
15 
16 static bool isItaniumEncoding(const std::string &MangledName) {
17   size_t Pos = MangledName.find_first_not_of('_');
18   // A valid Itanium encoding requires 1-4 leading underscores, followed by 'Z'.
19   return Pos > 0 && Pos <= 4 && MangledName[Pos] == 'Z';
20 }
21 
22 static bool isRustEncoding(const std::string &MangledName) {
23   return MangledName.size() >= 2 && MangledName[0] == '_' &&
24          MangledName[1] == 'R';
25 }
26 
27 std::string llvm::demangle(const std::string &MangledName) {
28   char *Demangled;
29   if (isItaniumEncoding(MangledName))
30     Demangled = itaniumDemangle(MangledName.c_str(), nullptr, nullptr, nullptr);
31   else if (isRustEncoding(MangledName))
32     Demangled = rustDemangle(MangledName.c_str(), nullptr, nullptr, nullptr);
33   else
34     Demangled = microsoftDemangle(MangledName.c_str(), nullptr, nullptr,
35                                   nullptr, nullptr);
36 
37   if (!Demangled)
38     return MangledName;
39 
40   std::string Ret = Demangled;
41   std::free(Demangled);
42   return Ret;
43 }
44