llvm/llvm/lib/TableGen/TableGenBackend.cpp

//===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides useful services for TableGen backends...
//
//===----------------------------------------------------------------------===//

#include "llvm/TableGen/TableGenBackend.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstddef>

usingnamespacellvm;
usingnamespaceTableGen::Emitter;

const size_t MAX_LINE_LEN = …;

// CommandLine options of class type are not directly supported with some
// specific exceptions like std::string which are safe to copy. In our case,
// the `FnT` function_ref object is also safe to copy. So provide a
// specialization of `OptionValue` for `FnT` type that stores it as a copy.
// This is essentially similar to OptionValue<std::string> specialization for
// strings.
template <> struct cl::OptionValue<FnT> final : cl::OptionValueCopy<FnT> { … };

namespace {
struct OptCreatorT { … };
} // namespace

static ManagedStatic<cl::opt<FnT>, OptCreatorT> CallbackFunction;

Opt::Opt(StringRef Name, FnT CB, StringRef Desc, bool ByDefault) { … }

/// Apply callback specified on the command line. Returns true if no callback
/// was applied.
bool llvm::TableGen::Emitter::ApplyCallback(RecordKeeper &Records,
                                            raw_ostream &OS) { … }

static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
                      StringRef Suffix) { … }

void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS,
                                const RecordKeeper &Record) { … }