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