Line data    Source code

       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        1967 : static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
      23             :                       StringRef Suffix) {
      24             :   size_t Pos = (size_t)OS.tell();
      25             :   assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) &&
      26             :          "header line exceeds max limit");
      27             :   OS << Prefix;
      28      116363 :   for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size();
      29      114396 :          i < e; ++i)
      30             :     OS << Fill;
      31        1967 :   OS << Suffix << '\n';
      32        1967 : }
      33             : 
      34         281 : void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
      35         281 :   printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
      36             :   StringRef Prefix("|* ");
      37             :   StringRef Suffix(" *|");
      38         281 :   printLine(OS, Prefix, ' ', Suffix);
      39         281 :   size_t PSLen = Prefix.size() + Suffix.size();
      40             :   assert(PSLen < MAX_LINE_LEN);
      41             :   size_t Pos = 0U;
      42             :   do {
      43         562 :     size_t Length = std::min(Desc.size() - Pos, MAX_LINE_LEN - PSLen);
      44         281 :     printLine(OS, Prefix + Desc.substr(Pos, Length), ' ', Suffix);
      45         281 :     Pos += Length;
      46         281 :   } while (Pos < Desc.size());
      47         281 :   printLine(OS, Prefix, ' ', Suffix);
      48         281 :   printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
      49             :     Suffix);
      50         281 :   printLine(OS, Prefix, ' ', Suffix);
      51         281 :   printLine(OS, "\\*===", '-', "===*/");
      52             :   OS << '\n';
      53         281 : }