1 //===- SkeletonEmitter.cpp - Skeleton TableGen backend -*- 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 // This Tablegen backend emits ... 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/ADT/DenseMapInfo.h" 14 #include "llvm/ADT/StringRef.h" 15 #include "llvm/TableGen/TableGenBackend.h" 16 17 #define DEBUG_TYPE "skeleton-emitter" 18 19 namespace llvm { 20 class RecordKeeper; 21 class raw_ostream; 22 } // namespace llvm 23 24 using namespace llvm; 25 26 namespace { 27 28 // Any helper data structures can be defined here. Some backends use 29 // structs to collect information from the records. 30 31 class SkeletonEmitter { 32 private: 33 RecordKeeper &Records; 34 35 public: 36 SkeletonEmitter(RecordKeeper &RK) : Records(RK) {} 37 38 void run(raw_ostream &OS); 39 }; // emitter class 40 41 } // anonymous namespace 42 43 void SkeletonEmitter::run(raw_ostream &OS) { 44 emitSourceFileHeader("Skeleton data structures", OS); 45 46 (void)Records; // To suppress unused variable warning; remove on use. 47 } 48 49 // Choose either option A or B. 50 51 //===----------------------------------------------------------------------===// 52 // Option A: Register the backed as class <SkeletonEmitter> 53 static TableGen::Emitter::OptClass<SkeletonEmitter> 54 X("gen-skeleton-class", "Generate example skeleton class"); 55 56 //===----------------------------------------------------------------------===// 57 // Option B: Register "EmitSkeleton" directly 58 // The emitter entry may be private scope. 59 static void EmitSkeleton(RecordKeeper &RK, raw_ostream &OS) { 60 // Instantiate the emitter class and invoke run(). 61 SkeletonEmitter(RK).run(OS); 62 } 63 64 static TableGen::Emitter::Opt Y("gen-skeleton-entry", EmitSkeleton, 65 "Generate example skeleton entry"); 66