1 //===- llvm/TableGen/TableGenBackend.h - Backend utilities ------*- C++ -*-===// 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 // Useful utilities for TableGen backends. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_TABLEGEN_TABLEGENBACKEND_H 14 #define LLVM_TABLEGEN_TABLEGENBACKEND_H 15 16 #include "llvm/ADT/StringRef.h" 17 #include "llvm/Support/CommandLine.h" 18 #include "llvm/Support/ManagedStatic.h" 19 20 namespace llvm { 21 22 class RecordKeeper; 23 class raw_ostream; 24 25 namespace TableGen::Emitter { 26 using FnT = void (*)(RecordKeeper &Records, raw_ostream &OS); 27 28 struct OptCreatorT { 29 static void *call(); 30 }; 31 32 extern ManagedStatic<cl::opt<FnT>, OptCreatorT> Action; 33 34 struct Opt { 35 Opt(StringRef Name, FnT CB, StringRef Desc, bool ByDefault = false) { 36 if (ByDefault) 37 Action->setInitialValue(CB); 38 Action->getParser().addLiteralOption(Name, CB, Desc); 39 } 40 }; 41 42 template <class EmitterC> class OptClass : Opt { 43 static void run(RecordKeeper &RK, raw_ostream &OS) { EmitterC(RK).run(OS); } 44 45 public: 46 OptClass(StringRef Name, StringRef Desc) : Opt(Name, run, Desc) {} 47 }; 48 49 } // namespace TableGen::Emitter 50 51 /// emitSourceFileHeader - Output an LLVM style file header to the specified 52 /// raw_ostream. 53 void emitSourceFileHeader(StringRef Desc, raw_ostream &OS); 54 55 } // End llvm namespace 56 57 #endif 58