1 //===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file provides useful services for TableGen backends... 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/TableGen/TableGenBackend.h" 15 #include "llvm/ADT/Twine.h" 16 #include "llvm/Support/raw_ostream.h" 17 18 using namespace llvm; 19 20 const size_t MAX_LINE_LEN = 80U; 21 22 static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill, 23 StringRef Suffix) { 24 size_t Pos = (size_t)OS.tell(); 25 assert((MAX_LINE_LEN - Prefix.str().size() - Suffix.size() > 0) && 26 "header line exceeds max limit"); 27 OS << Prefix; 28 const size_t e = MAX_LINE_LEN - Suffix.size(); 29 for (size_t i = (size_t)OS.tell() - Pos; i < e; ++i) 30 OS << Fill; 31 OS << Suffix << '\n'; 32 } 33 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); 39 size_t Pos = 0U; 40 do{ 41 size_t PSLen = Suffix.size() + Prefix.size(); 42 size_t PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ? 43 Desc.size() : 44 MAX_LINE_LEN - PSLen); 45 printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix); 46 Pos = PosE; 47 } while (Pos < Desc.size()); 48 printLine(OS, Prefix, ' ', Suffix); 49 printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ', 50 Suffix); 51 printLine(OS, Prefix, ' ', Suffix); 52 printLine(OS, "\\*===", '-', "===*/"); 53 OS << '\n'; 54 } 55