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/ADT/Twine.h" 15 #include "llvm/Support/raw_ostream.h" 16 #include "llvm/TableGen/TableGenBackend.h" 17 #include <algorithm> 18 19 using namespace llvm; 20 21 const size_t MAX_LINE_LEN = 80U; 22 23 static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill, 24 StringRef Suffix) { 25 size_t Pos = (size_t)OS.tell(); 26 assert((MAX_LINE_LEN - Prefix.str().size() - Suffix.size() > 0) && 27 "header line exceeds max limit"); 28 OS << Prefix; 29 const size_t e = MAX_LINE_LEN - Suffix.size(); 30 for (size_t i = (size_t)OS.tell() - Pos; i < e; ++i) 31 OS << Fill; 32 OS << Suffix << '\n'; 33 } 34 35 void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) { 36 printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\"); 37 printLine(OS, "|*", ' ', "*|"); 38 size_t Pos = 0U; 39 size_t PosE; 40 StringRef Prefix("|*"); 41 StringRef Suffix(" *|"); 42 do{ 43 size_t PSLen = Suffix.size() + Prefix.size(); 44 PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ? 45 Desc.size() : 46 MAX_LINE_LEN - PSLen); 47 printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix); 48 Pos = PosE; 49 } while(Pos < Desc.size()); 50 printLine(OS, Prefix, ' ', Suffix); 51 printLine(OS, Prefix + " Automatically generated file, do not edit!", ' ', 52 Suffix); 53 printLine(OS, Prefix, ' ', Suffix); 54 printLine(OS, "\\*===", '-', "===*/"); 55 OS << '\n'; 56 } 57
