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 "llvm/Demangle/StringViewExtras.h" 15 #include <cstdlib> 16 #include <string_view> 17 18 using llvm::itanium_demangle::starts_with; 19 20 std::string llvm::demangle(std::string_view MangledName) { 21 std::string Result; 22 23 if (nonMicrosoftDemangle(MangledName, Result)) 24 return Result; 25 26 if (starts_with(MangledName, '_') && 27 nonMicrosoftDemangle(MangledName.substr(1), Result, 28 /*CanHaveLeadingDot=*/false)) 29 return Result; 30 31 if (char *Demangled = microsoftDemangle(MangledName, nullptr, nullptr)) { 32 Result = Demangled; 33 std::free(Demangled); 34 } else { 35 Result = MangledName; 36 } 37 return Result; 38 } 39 40 static bool isItaniumEncoding(std::string_view S) { 41 // Itanium encoding requires 1 or 3 leading underscores, followed by 'Z'. 42 return starts_with(S, "_Z") || starts_with(S, "___Z"); 43 } 44 45 static bool isRustEncoding(std::string_view S) { return starts_with(S, "_R"); } 46 47 static bool isDLangEncoding(std::string_view S) { return starts_with(S, "_D"); } 48 49 bool llvm::nonMicrosoftDemangle(std::string_view MangledName, 50 std::string &Result, bool CanHaveLeadingDot) { 51 char *Demangled = nullptr; 52 53 // Do not consider the dot prefix as part of the demangled symbol name. 54 if (CanHaveLeadingDot && MangledName.size() > 0 && MangledName[0] == '.') { 55 MangledName.remove_prefix(1); 56 Result = "."; 57 } 58 59 if (isItaniumEncoding(MangledName)) 60 Demangled = itaniumDemangle(MangledName); 61 else if (isRustEncoding(MangledName)) 62 Demangled = rustDemangle(MangledName); 63 else if (isDLangEncoding(MangledName)) 64 Demangled = dlangDemangle(MangledName); 65 66 if (!Demangled) 67 return false; 68 69 Result += Demangled; 70 std::free(Demangled); 71 return true; 72 } 73