llvm/llvm/lib/MC/GOFFObjectWriter.cpp

//===- lib/MC/GOFFObjectWriter.cpp - GOFF File Writer ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements GOFF object file writer information.
//
//===----------------------------------------------------------------------===//

#include "llvm/BinaryFormat/GOFF.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCGOFFObjectWriter.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"

usingnamespacellvm;

#define DEBUG_TYPE …

namespace {

// The standard System/390 convention is to name the high-order (leftmost) bit
// in a byte as bit zero. The Flags type helps to set bits in a byte according
// to this numeration order.
class Flags { … };

// Common flag values on records.

// Flag: This record is continued.
constexpr uint8_t RecContinued = …;

// Flag: This record is a continuation.
constexpr uint8_t RecContinuation = …;

// The GOFFOstream is responsible to write the data into the fixed physical
// records of the format. A user of this class announces the start of a new
// logical record and the size of its content. While writing the content, the
// physical records are created for the data. Possible fill bytes at the end of
// a physical record are written automatically. In principle, the GOFFOstream
// is agnostic of the endianness of the content. However, it also supports
// writing data in big endian byte order.
class GOFFOstream : public raw_ostream { … };

void GOFFOstream::writeRecordPrefix(raw_ostream &OS, GOFF::RecordType Type,
                                    size_t RemainingSize, uint8_t Flags) { … }

void GOFFOstream::newRecord(GOFF::RecordType Type, size_t Size) { … }

void GOFFOstream::fillRecord() { … }

// This function is called from the raw_ostream implementation if:
// - The internal buffer is full. Size is excactly the size of the buffer.
// - Data larger than the internal buffer is written. Size is a multiple of the
//   buffer size.
// - flush() has been called. Size is at most the buffer size.
// The GOFFOstream implementation ensures that flush() is called before a new
// logical record begins. Therefore it is sufficient to check for a new block
// only once.
void GOFFOstream::write_impl(const char *Ptr, size_t Size) { … }

class GOFFObjectWriter : public MCObjectWriter { … };
} // end anonymous namespace

void GOFFObjectWriter::writeHeader() { … }

void GOFFObjectWriter::writeEnd() { … }

uint64_t GOFFObjectWriter::writeObject(MCAssembler &Asm) { … }

std::unique_ptr<MCObjectWriter>
llvm::createGOFFObjectWriter(std::unique_ptr<MCGOFFObjectTargetWriter> MOTW,
                             raw_pwrite_stream &OS) { … }