1 //=== RegistryParser.h - Linker-supported plugin registries -----*- 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 // Defines a command-line parser for a registry. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_SUPPORT_REGISTRY_PARSER_H 15 #define LLVM_SUPPORT_REGISTRY_PARSER_H 16 17 #include "llvm/Support/CommandLine.h" 18 #include "llvm/Support/Registry.h" 19 20 namespace llvm { 21 22 /// A command-line parser for a registry. Use like such: 23 /// 24 /// static cl::opt<Registry<Collector>::entry, false, 25 /// RegistryParser<Collector> > 26 /// GCOpt("gc", cl::desc("Garbage collector to use."), 27 /// cl::value_desc()); 28 /// 29 /// To make use of the value: 30 /// 31 /// Collector *TheCollector = GCOpt->instantiate(); 32 /// 33 template <typename T, typename U = RegistryTraits<T> > 34 class RegistryParser : 35 public cl::parser<const typename U::entry*>, 36 public Registry<T, U>::listener { 37 typedef U traits; 38 typedef typename U::entry entry; 39 typedef typename Registry<T, U>::listener listener; 40 41 protected: 42 void registered(const entry &E) { 43 addLiteralOption(traits::nameof(E), &E, traits::descof(E)); 44 } 45 46 public: 47 void initialize(cl::Option &O) { 48 listener::init(); 49 cl::parser<const typename U::entry*>::initialize(O); 50 } 51 }; 52 53 } 54 55 #endif // LLVM_SUPPORT_REGISTRY_PARSER_H 56
