1 //===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides useful services for TableGen backends...
12 //===----------------------------------------------------------------------===//
14 #include "llvm/TableGen/TableGenBackend.h"
15 #include "llvm/ADT/Twine.h"
16 #include "llvm/Support/raw_ostream.h"
20 const size_t MAX_LINE_LEN = 80U;
22 static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
24 size_t Pos = (size_t)OS.tell();
25 assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) &&
26 "header line exceeds max limit");
28 for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size();
34 void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
35 printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
36 StringRef Prefix("|* ");
37 StringRef Suffix(" *|");
38 printLine(OS, Prefix, ' ', Suffix);
41 size_t PSLen = Suffix.size() + Prefix.size();
42 size_t PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ?
44 MAX_LINE_LEN - PSLen);
45 printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix);
47 } while (Pos < Desc.size());
48 printLine(OS, Prefix, ' ', Suffix);
49 printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
51 printLine(OS, Prefix, ' ', Suffix);
52 printLine(OS, "\\*===", '-', "===*/");