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//===- TableGenBackend.cpp - Utilities for TableGen Backends ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides useful services for TableGen backends...
//
//===----------------------------------------------------------------------===//
#include "llvm/TableGen/TableGenBackend.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
const size_t MAX_LINE_LEN = 80U;
static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
StringRef Suffix) {
size_t Pos = (size_t)OS.tell();
assert((Prefix.str().size() + Suffix.size() <= MAX_LINE_LEN) &&
"header line exceeds max limit");
OS << Prefix;
for (size_t i = (size_t)OS.tell() - Pos, e = MAX_LINE_LEN - Suffix.size();
i < e; ++i)
OS << Fill;
OS << Suffix << '\n';
}
void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
StringRef Prefix("|* ");
StringRef Suffix(" *|");
printLine(OS, Prefix, ' ', Suffix);
size_t Pos = 0U;
do{
size_t PSLen = Suffix.size() + Prefix.size();
size_t PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ?
Desc.size() :
MAX_LINE_LEN - PSLen);
printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix);
Pos = PosE;
} while (Pos < Desc.size());
printLine(OS, Prefix, ' ', Suffix);
printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',
Suffix);
printLine(OS, Prefix, ' ', Suffix);
printLine(OS, "\\*===", '-', "===*/");
OS << '\n';
}
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