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0229e2b96e
When the first parameter (‘Desc’) is more than 80 characters long, it will result the header line that contains the description to be more Than (4GB!) long. Not only it takes forever to produce, the output file cannot be open, since its ginormous. Patch by Elior Malul. llvm-svn: 173672
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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