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1 //===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- 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 file provides useful services for TableGen backends...
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "llvm/TableGen/TableGenBackend.h"
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14 #include "llvm/ADT/Twine.h"
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15 #include "llvm/Support/raw_ostream.h"
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173
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16 #include <cassert>
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150
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17
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18 using namespace llvm;
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19
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20 const size_t MAX_LINE_LEN = 80U;
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21
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22 static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
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23 StringRef Suffix) {
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24 size_t Pos = (size_t)OS.tell();
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25 assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) &&
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26 "header line exceeds max limit");
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27 OS << Prefix;
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28 for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size();
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29 i < e; ++i)
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30 OS << Fill;
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31 OS << Suffix << '\n';
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32 }
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33
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34 void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
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35 printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
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36 StringRef Prefix("|* ");
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37 StringRef Suffix(" *|");
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38 printLine(OS, Prefix, ' ', Suffix);
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39 size_t PSLen = Prefix.size() + Suffix.size();
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40 assert(PSLen < MAX_LINE_LEN);
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41 size_t Pos = 0U;
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42 do {
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43 size_t Length = std::min(Desc.size() - Pos, MAX_LINE_LEN - PSLen);
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44 printLine(OS, Prefix + Desc.substr(Pos, Length), ' ', Suffix);
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45 Pos += Length;
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46 } while (Pos < Desc.size());
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47 printLine(OS, Prefix, ' ', Suffix);
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48 printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
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49 Suffix);
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50 printLine(OS, Prefix, ' ', Suffix);
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51 printLine(OS, "\\*===", '-', "===*/");
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52 OS << '\n';
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53 }
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