| 1 | //===- SkeletonEmitter.cpp - Skeleton TableGen backend -*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This Tablegen backend emits ... |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "llvm/ADT/StringRef.h" |
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| 14 | #include "llvm/TableGen/TableGenBackend.h" |
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| 15 | |
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| 16 | #define DEBUG_TYPE "skeleton-emitter" |
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| 17 | |
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| 18 | namespace llvm { |
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| 19 | class RecordKeeper; |
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| 20 | class raw_ostream; |
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| 21 | } // namespace llvm |
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| 22 | |
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| 23 | using namespace llvm; |
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| 24 | |
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| 25 | namespace { |
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| 26 | |
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| 27 | // Any helper data structures can be defined here. Some backends use |
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| 28 | // structs to collect information from the records. |
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| 29 | |
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| 30 | class SkeletonEmitter { |
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| 31 | private: |
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| 32 | RecordKeeper &Records; |
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| 33 | |
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| 34 | public: |
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| 35 | SkeletonEmitter(RecordKeeper &RK) : Records(RK) {} |
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| 36 | |
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| 37 | void run(raw_ostream &OS); |
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| 38 | }; // emitter class |
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| 39 | |
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| 40 | } // anonymous namespace |
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| 41 | |
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| 42 | void SkeletonEmitter::run(raw_ostream &OS) { |
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| 43 | emitSourceFileHeader(Desc: "Skeleton data structures" , OS); |
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| 44 | |
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| 45 | (void)Records; // To suppress unused variable warning; remove on use. |
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| 46 | } |
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| 47 | |
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| 48 | // Choose either option A or B. |
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| 49 | |
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| 50 | //===----------------------------------------------------------------------===// |
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| 51 | // Option A: Register the backed as class <SkeletonEmitter> |
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| 52 | static TableGen::Emitter::OptClass<SkeletonEmitter> |
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| 53 | X("gen-skeleton-class" , "Generate example skeleton class" ); |
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| 54 | |
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| 55 | //===----------------------------------------------------------------------===// |
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| 56 | // Option B: Register "EmitSkeleton" directly |
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| 57 | // The emitter entry may be private scope. |
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| 58 | static void EmitSkeleton(RecordKeeper &RK, raw_ostream &OS) { |
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| 59 | // Instantiate the emitter class and invoke run(). |
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| 60 | SkeletonEmitter(RK).run(OS); |
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| 61 | } |
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| 62 | |
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| 63 | static TableGen::Emitter::Opt Y("gen-skeleton-entry" , EmitSkeleton, |
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| 64 | "Generate example skeleton entry" ); |
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| 65 | |
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