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> 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
