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 demangler supports prefixes with 1-4 underscores. 42 const size_t Pos = S.find_first_not_of('_'); 43 return Pos > 0 && Pos <= 4 && S[Pos] == 'Z'; 44 } 45 46 static bool isRustEncoding(std::string_view S) { return starts_with(S, "_R"); } 47 48 static bool isDLangEncoding(std::string_view S) { return starts_with(S, "_D"); } 49 50 bool llvm::nonMicrosoftDemangle(std::string_view MangledName, 51 std::string &Result, bool CanHaveLeadingDot, 52 bool ParseParams) { 53 char *Demangled = nullptr; 54 55 // Do not consider the dot prefix as part of the demangled symbol name. 56 if (CanHaveLeadingDot && MangledName.size() > 0 && MangledName[0] == '.') { 57 MangledName.remove_prefix(1); 58 Result = "."; 59 } 60 61 if (isItaniumEncoding(MangledName)) 62 Demangled = itaniumDemangle(MangledName, ParseParams); 63 else if (isRustEncoding(MangledName)) 64 Demangled = rustDemangle(MangledName); 65 else if (isDLangEncoding(MangledName)) 66 Demangled = dlangDemangle(MangledName); 67 68 if (!Demangled) 69 return false; 70 71 Result += Demangled; 72 std::free(Demangled); 73 return true; 74 } 75