1*0b57cec5SDimitry Andric //===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file provides useful services for TableGen backends... 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #include "llvm/TableGen/TableGenBackend.h" 14*0b57cec5SDimitry Andric #include "llvm/ADT/Twine.h" 15*0b57cec5SDimitry Andric #include "llvm/Support/raw_ostream.h" 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric using namespace llvm; 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric const size_t MAX_LINE_LEN = 80U; 20*0b57cec5SDimitry Andric 21*0b57cec5SDimitry Andric static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill, 22*0b57cec5SDimitry Andric StringRef Suffix) { 23*0b57cec5SDimitry Andric size_t Pos = (size_t)OS.tell(); 24*0b57cec5SDimitry Andric assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) && 25*0b57cec5SDimitry Andric "header line exceeds max limit"); 26*0b57cec5SDimitry Andric OS << Prefix; 27*0b57cec5SDimitry Andric for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size(); 28*0b57cec5SDimitry Andric i < e; ++i) 29*0b57cec5SDimitry Andric OS << Fill; 30*0b57cec5SDimitry Andric OS << Suffix << '\n'; 31*0b57cec5SDimitry Andric } 32*0b57cec5SDimitry Andric 33*0b57cec5SDimitry Andric void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) { 34*0b57cec5SDimitry Andric printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\"); 35*0b57cec5SDimitry Andric StringRef Prefix("|* "); 36*0b57cec5SDimitry Andric StringRef Suffix(" *|"); 37*0b57cec5SDimitry Andric printLine(OS, Prefix, ' ', Suffix); 38*0b57cec5SDimitry Andric size_t PSLen = Prefix.size() + Suffix.size(); 39*0b57cec5SDimitry Andric assert(PSLen < MAX_LINE_LEN); 40*0b57cec5SDimitry Andric size_t Pos = 0U; 41*0b57cec5SDimitry Andric do { 42*0b57cec5SDimitry Andric size_t Length = std::min(Desc.size() - Pos, MAX_LINE_LEN - PSLen); 43*0b57cec5SDimitry Andric printLine(OS, Prefix + Desc.substr(Pos, Length), ' ', Suffix); 44*0b57cec5SDimitry Andric Pos += Length; 45*0b57cec5SDimitry Andric } while (Pos < Desc.size()); 46*0b57cec5SDimitry Andric printLine(OS, Prefix, ' ', Suffix); 47*0b57cec5SDimitry Andric printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ', 48*0b57cec5SDimitry Andric Suffix); 49*0b57cec5SDimitry Andric printLine(OS, Prefix, ' ', Suffix); 50*0b57cec5SDimitry Andric printLine(OS, "\\*===", '-', "===*/"); 51*0b57cec5SDimitry Andric OS << '\n'; 52*0b57cec5SDimitry Andric } 53