4178ef43b2
`Opt(flag, func, desc)` registers an option into `Action`. `OptClass<EmitterC>` is also available if `EmitterC(RK).run(OS)` is capable. `Action` is defined as `ManagedStatic<cl::opt>` to guarantee to be created when each registration of emitter is invoked. `llvm::TableGenMain(argv0, MainFn)` invokes `Action` instead of `MainFn` Differential Revision: https://reviews.llvm.org/D144351
66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
//===- SkeletonEmitter.cpp - Skeleton TableGen backend -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This Tablegen backend emits ...
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/DenseMapInfo.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/TableGen/TableGenBackend.h"
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#define DEBUG_TYPE "skeleton-emitter"
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namespace llvm {
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class RecordKeeper;
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class raw_ostream;
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} // namespace llvm
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using namespace llvm;
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namespace {
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// Any helper data structures can be defined here. Some backends use
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// structs to collect information from the records.
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class SkeletonEmitter {
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private:
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RecordKeeper &Records;
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public:
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SkeletonEmitter(RecordKeeper &RK) : Records(RK) {}
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void run(raw_ostream &OS);
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}; // emitter class
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} // anonymous namespace
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void SkeletonEmitter::run(raw_ostream &OS) {
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emitSourceFileHeader("Skeleton data structures", OS);
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(void)Records; // To suppress unused variable warning; remove on use.
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}
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// Choose either option A or B.
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//===----------------------------------------------------------------------===//
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// Option A: Register the backed as class <SkeletonEmitter>
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static TableGen::Emitter::OptClass<SkeletonEmitter>
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X("gen-skeleton-class", "Generate example skeleton class");
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//===----------------------------------------------------------------------===//
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// Option B: Register "EmitSkeleton" directly
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// The emitter entry may be private scope.
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static void EmitSkeleton(RecordKeeper &RK, raw_ostream &OS) {
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// Instantiate the emitter class and invoke run().
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SkeletonEmitter(RK).run(OS);
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}
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static TableGen::Emitter::Opt Y("gen-skeleton-entry", EmitSkeleton,
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"Generate example skeleton entry");
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