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 #include "llvm/TableGen/Record.h" 20 21 namespace llvm { 22 23 class RecordKeeper; 24 class raw_ostream; 25 26 namespace TableGen::Emitter { 27 using FnT = void (*)(RecordKeeper &Records, raw_ostream &OS); 28 29 struct OptCreatorT { 30 static void *call(); 31 }; 32 33 extern ManagedStatic<cl::opt<FnT>, OptCreatorT> Action; 34 35 struct Opt { 36 Opt(StringRef Name, FnT CB, StringRef Desc, bool ByDefault = false) { 37 if (ByDefault) 38 Action->setInitialValue(CB); 39 Action->getParser().addLiteralOption(Name, CB, Desc); 40 } 41 }; 42 43 template <class EmitterC> class OptClass : Opt { 44 static void run(RecordKeeper &RK, raw_ostream &OS) { EmitterC(RK).run(OS); } 45 46 public: 47 OptClass(StringRef Name, StringRef Desc) : Opt(Name, run, Desc) {} 48 }; 49 50 } // namespace TableGen::Emitter 51 52 /// emitSourceFileHeader - Output an LLVM style file header to the specified 53 /// raw_ostream. 54 void emitSourceFileHeader(StringRef Desc, raw_ostream &OS, 55 const RecordKeeper &Record = RecordKeeper()); 56 57 } // End llvm namespace 58 59 #endif 60