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54 lines
1.8 KiB
54 lines
1.8 KiB
4 months ago
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//===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- 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 file provides useful services for TableGen backends...
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/TableGen/TableGenBackend.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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using namespace llvm;
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const size_t MAX_LINE_LEN = 80U;
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static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
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StringRef Suffix) {
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size_t Pos = (size_t)OS.tell();
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assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) &&
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"header line exceeds max limit");
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OS << Prefix;
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for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size();
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i < e; ++i)
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OS << Fill;
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OS << Suffix << '\n';
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}
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void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
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printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
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StringRef Prefix("|* ");
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StringRef Suffix(" *|");
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printLine(OS, Prefix, ' ', Suffix);
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size_t PSLen = Prefix.size() + Suffix.size();
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assert(PSLen < MAX_LINE_LEN);
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size_t Pos = 0U;
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do {
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size_t Length = std::min(Desc.size() - Pos, MAX_LINE_LEN - PSLen);
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printLine(OS, Prefix + Desc.substr(Pos, Length), ' ', Suffix);
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Pos += Length;
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} while (Pos < Desc.size());
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printLine(OS, Prefix, ' ', Suffix);
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printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
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Suffix);
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printLine(OS, Prefix, ' ', Suffix);
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printLine(OS, "\\*===", '-', "===*/");
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OS << '\n';
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}
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