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//===- PDBFileBuilder.cpp - PDB File Creation -------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "llvm/DebugInfo/PDB/Native/PDBFileBuilder.h"

#include "llvm/ADT/BitVector.h"

#include "llvm/DebugInfo/MSF/MSFBuilder.h"
#include "llvm/DebugInfo/PDB/GenericError.h"
#include "llvm/DebugInfo/PDB/Native/DbiStream.h"
#include "llvm/DebugInfo/PDB/Native/DbiStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/GSIStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/InfoStream.h"
#include "llvm/DebugInfo/PDB/Native/InfoStreamBuilder.h"
#include "llvm/DebugInfo/PDB/Native/PDBStringTableBuilder.h"
#include "llvm/DebugInfo/PDB/Native/RawError.h"
#include "llvm/DebugInfo/PDB/Native/TpiStream.h"
#include "llvm/DebugInfo/PDB/Native/TpiStreamBuilder.h"
#include "llvm/Support/BinaryStream.h"
#include "llvm/Support/BinaryStreamWriter.h"

using namespace llvm;
using namespace llvm::codeview;
using namespace llvm::msf;
using namespace llvm::pdb;
using namespace llvm::support;

PDBFileBuilder::PDBFileBuilder(BumpPtrAllocator &Allocator)
    : Allocator(Allocator) {}

PDBFileBuilder::~PDBFileBuilder() {}

Error PDBFileBuilder::initialize(uint32_t BlockSize) {
  auto ExpectedMsf = MSFBuilder::create(Allocator, BlockSize);
  if (!ExpectedMsf)
    return ExpectedMsf.takeError();
  Msf = llvm::make_unique<MSFBuilder>(std::move(*ExpectedMsf));
  return Error::success();
}

MSFBuilder &PDBFileBuilder::getMsfBuilder() { return *Msf; }

InfoStreamBuilder &PDBFileBuilder::getInfoBuilder() {
  if (!Info)
    Info = llvm::make_unique<InfoStreamBuilder>(*Msf, NamedStreams);
  return *Info;
}

DbiStreamBuilder &PDBFileBuilder::getDbiBuilder() {
  if (!Dbi)
    Dbi = llvm::make_unique<DbiStreamBuilder>(*Msf);
  return *Dbi;
}

TpiStreamBuilder &PDBFileBuilder::getTpiBuilder() {
  if (!Tpi)
    Tpi = llvm::make_unique<TpiStreamBuilder>(*Msf, StreamTPI);
  return *Tpi;
}

TpiStreamBuilder &PDBFileBuilder::getIpiBuilder() {
  if (!Ipi)
    Ipi = llvm::make_unique<TpiStreamBuilder>(*Msf, StreamIPI);
  return *Ipi;
}

PDBStringTableBuilder &PDBFileBuilder::getStringTableBuilder() {
  return Strings;
}

GSIStreamBuilder &PDBFileBuilder::getGsiBuilder() {
  if (!Gsi)
    Gsi = llvm::make_unique<GSIStreamBuilder>(*Msf);
  return *Gsi;
}

Error PDBFileBuilder::addNamedStream(StringRef Name, uint32_t Size) {
  auto ExpectedStream = Msf->addStream(Size);
  if (!ExpectedStream)
    return ExpectedStream.takeError();
  NamedStreams.set(Name, *ExpectedStream);
  return Error::success();
}

Expected<msf::MSFLayout> PDBFileBuilder::finalizeMsfLayout() {

  if (Ipi && Ipi->getRecordCount() > 0) {
    // In theory newer PDBs always have an ID stream, but by saying that we're
    // only going to *really* have an ID stream if there is at least one ID
    // record, we leave open the opportunity to test older PDBs such as those
    // that don't have an ID stream.
    auto &Info = getInfoBuilder();
    Info.addFeature(PdbRaw_FeatureSig::VC140);
  }

  uint32_t StringsLen = Strings.calculateSerializedSize();

  if (auto EC = addNamedStream("/names", StringsLen))
    return std::move(EC);
  if (auto EC = addNamedStream("/LinkInfo", 0))
    return std::move(EC);

  if (Info) {
    if (auto EC = Info->finalizeMsfLayout())
      return std::move(EC);
  }
  if (Dbi) {
    if (auto EC = Dbi->finalizeMsfLayout())
      return std::move(EC);
  }
  if (Tpi) {
    if (auto EC = Tpi->finalizeMsfLayout())
      return std::move(EC);
  }
  if (Ipi) {
    if (auto EC = Ipi->finalizeMsfLayout())
      return std::move(EC);
  }
  if (Gsi) {
    if (auto EC = Gsi->finalizeMsfLayout())
      return std::move(EC);
    if (Dbi) {
      Dbi->setPublicsStreamIndex(Gsi->getPublicsStreamIndex());
      Dbi->setGlobalsStreamIndex(Gsi->getGlobalsStreamIndex());
      Dbi->setSymbolRecordStreamIndex(Gsi->getRecordStreamIdx());
    }
  }

  return Msf->build();
}

Expected<uint32_t> PDBFileBuilder::getNamedStreamIndex(StringRef Name) const {
  uint32_t SN = 0;
  if (!NamedStreams.get(Name, SN))
    return llvm::make_error<pdb::RawError>(raw_error_code::no_stream);
  return SN;
}

void PDBFileBuilder::commitFpm(WritableBinaryStream &MsfBuffer,
                               const MSFLayout &Layout) {
  auto FpmStream =
      WritableMappedBlockStream::createFpmStream(Layout, MsfBuffer, Allocator);

  // We only need to create the alt fpm stream so that it gets initialized.
  WritableMappedBlockStream::createFpmStream(Layout, MsfBuffer, Allocator,
                                             true);

  uint32_t BI = 0;
  BinaryStreamWriter FpmWriter(*FpmStream);
  while (BI < Layout.SB->NumBlocks) {
    uint8_t ThisByte = 0;
    for (uint32_t I = 0; I < 8; ++I) {
      bool IsFree =
          (BI < Layout.SB->NumBlocks) ? Layout.FreePageMap.test(BI) : true;
      uint8_t Mask = uint8_t(IsFree) << I;
      ThisByte |= Mask;
      ++BI;
    }
    cantFail(FpmWriter.writeObject(ThisByte));
  }
  assert(FpmWriter.bytesRemaining() == 0);
}

Error PDBFileBuilder::commit(StringRef Filename) {
  assert(!Filename.empty());
  auto ExpectedLayout = finalizeMsfLayout();
  if (!ExpectedLayout)
    return ExpectedLayout.takeError();
  auto &Layout = *ExpectedLayout;

  uint64_t Filesize = Layout.SB->BlockSize * Layout.SB->NumBlocks;
  auto OutFileOrError = FileOutputBuffer::create(Filename, Filesize);
  if (auto E = OutFileOrError.takeError())
    return E;
  FileOutputBuffer *FOB = OutFileOrError->get();

  FileBufferByteStream Buffer(std::move(*OutFileOrError),
                              llvm::support::little);
  BinaryStreamWriter Writer(Buffer);

  if (auto EC = Writer.writeObject(*Layout.SB))
    return EC;

  commitFpm(Buffer, Layout);

  uint32_t BlockMapOffset =
      msf::blockToOffset(Layout.SB->BlockMapAddr, Layout.SB->BlockSize);
  Writer.setOffset(BlockMapOffset);
  if (auto EC = Writer.writeArray(Layout.DirectoryBlocks))
    return EC;

  auto DirStream = WritableMappedBlockStream::createDirectoryStream(
      Layout, Buffer, Allocator);
  BinaryStreamWriter DW(*DirStream);
  if (auto EC = DW.writeInteger<uint32_t>(Layout.StreamSizes.size()))
    return EC;

  if (auto EC = DW.writeArray(Layout.StreamSizes))
    return EC;

  for (const auto &Blocks : Layout.StreamMap) {
    if (auto EC = DW.writeArray(Blocks))
      return EC;
  }

  auto ExpectedSN = getNamedStreamIndex("/names");
  if (!ExpectedSN)
    return ExpectedSN.takeError();

  auto NS = WritableMappedBlockStream::createIndexedStream(
      Layout, Buffer, *ExpectedSN, Allocator);
  BinaryStreamWriter NSWriter(*NS);
  if (auto EC = Strings.commit(NSWriter))
    return EC;

  if (Info) {
    if (auto EC = Info->commit(Layout, Buffer))
      return EC;
  }

  if (Dbi) {
    if (auto EC = Dbi->commit(Layout, Buffer))
      return EC;
  }

  if (Tpi) {
    if (auto EC = Tpi->commit(Layout, Buffer))
      return EC;
  }

  if (Ipi) {
    if (auto EC = Ipi->commit(Layout, Buffer))
      return EC;
  }

  if (Gsi) {
    if (auto EC = Gsi->commit(Layout, Buffer))
      return EC;
  }

  auto InfoStreamBlocks = Layout.StreamMap[StreamPDB];
  assert(!InfoStreamBlocks.empty());
  uint64_t InfoStreamFileOffset =
      blockToOffset(InfoStreamBlocks.front(), Layout.SB->BlockSize);
  InfoStreamHeader *H = reinterpret_cast<InfoStreamHeader *>(
      FOB->getBufferStart() + InfoStreamFileOffset);

  // Set the build id at the very end, after every other byte of the PDB
  // has been written.
  // FIXME: Use a hash of the PDB rather than time(nullptr) for the signature.
  H->Age = Info->getAge();
  H->Guid = Info->getGuid();
  Optional<uint32_t> Sig = Info->getSignature();
  H->Signature = Sig.hasValue() ? *Sig : time(nullptr);

  return Buffer.commit();
}