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
demangle(std::string_view MangledName)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
isItaniumEncoding(std::string_view S)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
isRustEncoding(std::string_view S)46 static bool isRustEncoding(std::string_view S) { return starts_with(S, "_R"); }
47
isDLangEncoding(std::string_view S)48 static bool isDLangEncoding(std::string_view S) { return starts_with(S, "_D"); }
49
nonMicrosoftDemangle(std::string_view MangledName,std::string & Result,bool CanHaveLeadingDot,bool ParseParams)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