1 //===- TypeName.h -----------------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef LLVM_SUPPORT_TYPENAME_H
11 #define LLVM_SUPPORT_TYPENAME_H
12 
13 #include "llvm/ADT/StringRef.h"
14 
15 namespace llvm {
16 
17 /// We provide a function which tries to compute the (demangled) name of a type
18 /// statically.
19 ///
20 /// This routine may fail on some platforms or for particularly unusual types.
21 /// Do not use it for anything other than logging and debugging aids. It isn't
22 /// portable or dependendable in any real sense.
23 ///
24 /// The returned StringRef will point into a static storage duration string.
25 /// However, it may not be null terminated and may be some strangely aligned
26 /// inner substring of a larger string.
27 template <typename DesiredTypeName>
getTypeName()28 inline StringRef getTypeName() {
29 #if defined(__clang__) || defined(__GNUC__)
30   StringRef Name = __PRETTY_FUNCTION__;
31 
32   StringRef Key = "DesiredTypeName = ";
33   Name = Name.substr(Name.find(Key));
34   assert(!Name.empty() && "Unable to find the template parameter!");
35   Name = Name.drop_front(Key.size());
36 
37   assert(Name.endswith("]") && "Name doesn't end in the substitution key!");
38   return Name.drop_back(1);
39 #elif defined(_MSC_VER)
40   StringRef Name = __FUNCSIG__;
41 
42   StringRef Key = "getTypeName<";
43   Name = Name.substr(Name.find(Key));
44   assert(!Name.empty() && "Unable to find the function name!");
45   Name = Name.drop_front(Key.size());
46 
47   for (StringRef Prefix : {"class ", "struct ", "union ", "enum "})
48     if (Name.startswith(Prefix)) {
49       Name = Name.drop_front(Prefix.size());
50       break;
51     }
52 
53   auto AnglePos = Name.rfind('>');
54   assert(AnglePos != StringRef::npos && "Unable to find the closing '>'!");
55   return Name.substr(0, AnglePos);
56 #else
57   // No known technique for statically extracting a type name on this compiler.
58   // We return a string that is unlikely to look like any type in LLVM.
59   return "UNKNOWN_TYPE";
60 #endif
61 }
62 
63 }
64 
65 #endif
66