MFC r309124:

Upgrade our copies of clang, llvm, lldb, compiler-rt and libc++ to 3.9.0
release, and add lld 3.9.0.  Also completely revamp the build system for
clang, llvm, lldb and their related tools.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld are available here:
<http://llvm.org/releases/3.9.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/clang/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.9.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Bryan Drewery, Andrew Turner, Antoine Brodin and Jan
Beich for their help.

Relnotes:	yes

MFC r309147:

Pull in r282174 from upstream llvm trunk (by Krzysztof Parzyszek):

  [PPC] Set SP after loading data from stack frame, if no red zone is
  present

  Follow-up to r280705: Make sure that the SP is only restored after
  all data is loaded from the stack frame, if there is no red zone.

  This completes the fix for
  https://llvm.org/bugs/show_bug.cgi?id=26519.

  Differential Revision: https://reviews.llvm.org/D24466

Reported by:    Mark Millard
PR:             214433

MFC r309149:

Pull in r283060 from upstream llvm trunk (by Hal Finkel):

  [PowerPC] Refactor soft-float support, and enable PPC64 soft float

  This change enables soft-float for PowerPC64, and also makes
  soft-float disable all vector instruction sets for both 32-bit and
  64-bit modes. This latter part is necessary because the PPC backend
  canonicalizes many Altivec vector types to floating-point types, and
  so soft-float breaks scalarization support for many operations. Both
  for embedded targets and for operating-system kernels desiring
  soft-float support, it seems reasonable that disabling hardware
  floating-point also disables vector instructions (embedded targets
  without hardware floating point support are unlikely to have Altivec,
  etc. and operating system kernels desiring not to use floating-point
  registers to lower syscall cost are unlikely to want to use vector
  registers either). If someone needs this to work, we'll need to
  change the fact that we promote many Altivec operations to act on
  v4f32. To make it possible to disable Altivec when soft-float is
  enabled, hardware floating-point support needs to be expressed as a
  positive feature, like the others, and not a negative feature,
  because target features cannot have dependencies on the disabling of
  some other feature. So +soft-float has now become -hard-float.

  Fixes PR26970.

Pull in r283061 from upstream clang trunk (by Hal Finkel):

  [PowerPC] Enable soft-float for PPC64, and +soft-float -> -hard-float

  Enable soft-float support on PPC64, as the backend now supports it.
  Also, the backend now uses -hard-float instead of +soft-float, so set
  the target features accordingly.

  Fixes PR26970.

Reported by:	Mark Millard
PR:		214433

MFC r309212:

Add a few missed clang 3.9.0 files to OptionalObsoleteFiles.

MFC r309262:

Fix packaging for clang, lldb and lld 3.9.0

During the upgrade of clang/llvm etc to 3.9.0 in r309124, the PACKAGE
directive in the usr.bin/clang/*.mk files got dropped accidentally.

Restore it, with a few minor changes and additions:
* Correct license in clang.ucl to NCSA
* Add PACKAGE=clang for clang and most of the "ll" tools
* Put lldb in its own package
* Put lld in its own package

Reviewed by:	gjb, jmallett
Differential Revision: https://reviews.freebsd.org/D8666

MFC r309656:

During the bootstrap phase, when building the minimal llvm library on
PowerPC, add lib/Support/Atomic.cpp.  This is needed because upstream
llvm revision r271821 disabled the use of std::call_once, which causes
some fallback functions from Atomic.cpp to be used instead.

Reported by:	Mark Millard
PR:		214902

MFC r309835:

Tentatively apply https://reviews.llvm.org/D18730 to work around gcc PR
70528 (bogus error: constructor required before non-static data member).
This should fix buildworld with the external gcc package.

Reported by:	https://jenkins.freebsd.org/job/FreeBSD_HEAD_amd64_gcc/

MFC r310194:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
3.9.1 release.

Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/3.9.1/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/3.9.1/tools/lld/docs/ReleaseNotes.html>

Relnotes:	yes

1 files changed, 462 insertions, 0 deletions

diff --git a/contrib/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp b/contrib/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
new file mode 100644
index 0000000..3c0586c
--- /dev/null
+++ b/contrib/llvm/lib/DebugInfo/PDB/Raw/DbiStream.cpp
@@ -0,0 +1,462 @@
+//===- DbiStream.cpp - PDB Dbi Stream (Stream 3) Access -------------------===//
+//
+//                     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/Raw/DbiStream.h"
+
+#include "llvm/DebugInfo/CodeView/StreamArray.h"
+#include "llvm/DebugInfo/CodeView/StreamReader.h"
+#include "llvm/DebugInfo/CodeView/StreamWriter.h"
+#include "llvm/DebugInfo/PDB/Raw/ISectionContribVisitor.h"
+#include "llvm/DebugInfo/PDB/Raw/IndexedStreamData.h"
+#include "llvm/DebugInfo/PDB/Raw/InfoStream.h"
+#include "llvm/DebugInfo/PDB/Raw/ModInfo.h"
+#include "llvm/DebugInfo/PDB/Raw/NameHashTable.h"
+#include "llvm/DebugInfo/PDB/Raw/PDBFile.h"
+#include "llvm/DebugInfo/PDB/Raw/RawConstants.h"
+#include "llvm/DebugInfo/PDB/Raw/RawError.h"
+#include "llvm/DebugInfo/PDB/Raw/RawTypes.h"
+#include "llvm/Object/COFF.h"
+
+using namespace llvm;
+using namespace llvm::codeview;
+using namespace llvm::pdb;
+using namespace llvm::support;
+
+namespace {
+// Some of the values are stored in bitfields.  Since this needs to be portable
+// across compilers and architectures (big / little endian in particular) we
+// can't use the actual structures below, but must instead do the shifting
+// and masking ourselves.  The struct definitions are provided for reference.
+
+// struct DbiFlags {
+//  uint16_t IncrementalLinking : 1;  // True if linked incrementally
+//  uint16_t IsStripped : 1;          // True if private symbols were stripped.
+//  uint16_t HasCTypes : 1;           // True if linked with /debug:ctypes.
+//  uint16_t Reserved : 13;
+//};
+const uint16_t FlagIncrementalMask = 0x0001;
+const uint16_t FlagStrippedMask = 0x0002;
+const uint16_t FlagHasCTypesMask = 0x0004;
+
+// struct DbiBuildNo {
+//  uint16_t MinorVersion : 8;
+//  uint16_t MajorVersion : 7;
+//  uint16_t NewVersionFormat : 1;
+//};
+const uint16_t BuildMinorMask = 0x00FF;
+const uint16_t BuildMinorShift = 0;
+
+const uint16_t BuildMajorMask = 0x7F00;
+const uint16_t BuildMajorShift = 8;
+
+struct FileInfoSubstreamHeader {
+  ulittle16_t NumModules;     // Total # of modules, should match number of
+                              // records in the ModuleInfo substream.
+  ulittle16_t NumSourceFiles; // Total # of source files.  This value is not
+                              // accurate because PDB actually supports more
+                              // than 64k source files, so we ignore it and
+                              // compute the value from other stream fields.
+};
+}
+
+template <typename ContribType>
+static Error loadSectionContribs(FixedStreamArray<ContribType> &Output,
+                                 StreamReader &Reader) {
+  if (Reader.bytesRemaining() % sizeof(ContribType) != 0)
+    return make_error<RawError>(
+        raw_error_code::corrupt_file,
+        "Invalid number of bytes of section contributions");
+
+  uint32_t Count = Reader.bytesRemaining() / sizeof(ContribType);
+  if (auto EC = Reader.readArray(Output, Count))
+    return EC;
+  return Error::success();
+}
+
+DbiStream::DbiStream(PDBFile &File, std::unique_ptr<MappedBlockStream> Stream)
+    : Pdb(File), Stream(std::move(Stream)), Header(nullptr) {
+  static_assert(sizeof(HeaderInfo) == 64, "Invalid HeaderInfo size!");
+}
+
+DbiStream::~DbiStream() {}
+
+Error DbiStream::reload() {
+  StreamReader Reader(*Stream);
+
+  if (Stream->getLength() < sizeof(HeaderInfo))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI Stream does not contain a header.");
+  if (auto EC = Reader.readObject(Header))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI Stream does not contain a header.");
+
+  if (Header->VersionSignature != -1)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Invalid DBI version signature.");
+
+  // Require at least version 7, which should be present in all PDBs
+  // produced in the last decade and allows us to avoid having to
+  // special case all kinds of complicated arcane formats.
+  if (Header->VersionHeader < PdbDbiV70)
+    return make_error<RawError>(raw_error_code::feature_unsupported,
+                                "Unsupported DBI version.");
+
+  auto IS = Pdb.getPDBInfoStream();
+  if (!IS)
+    return IS.takeError();
+
+  if (Header->Age != IS->getAge())
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI Age does not match PDB Age.");
+
+  if (Stream->getLength() !=
+      sizeof(HeaderInfo) + Header->ModiSubstreamSize +
+          Header->SecContrSubstreamSize + Header->SectionMapSize +
+          Header->FileInfoSize + Header->TypeServerSize +
+          Header->OptionalDbgHdrSize + Header->ECSubstreamSize)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI Length does not equal sum of substreams.");
+
+  // Only certain substreams are guaranteed to be aligned.  Validate
+  // them here.
+  if (Header->ModiSubstreamSize % sizeof(uint32_t) != 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI MODI substream not aligned.");
+  if (Header->SecContrSubstreamSize % sizeof(uint32_t) != 0)
+    return make_error<RawError>(
+        raw_error_code::corrupt_file,
+        "DBI section contribution substream not aligned.");
+  if (Header->SectionMapSize % sizeof(uint32_t) != 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI section map substream not aligned.");
+  if (Header->FileInfoSize % sizeof(uint32_t) != 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI file info substream not aligned.");
+  if (Header->TypeServerSize % sizeof(uint32_t) != 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "DBI type server substream not aligned.");
+
+  // Since each ModInfo in the stream is a variable length, we have to iterate
+  // them to know how many there actually are.
+  VarStreamArray<ModInfo> ModInfoArray;
+  if (auto EC = Reader.readArray(ModInfoArray, Header->ModiSubstreamSize))
+    return EC;
+  for (auto &Info : ModInfoArray) {
+    ModuleInfos.emplace_back(Info);
+  }
+
+  if (auto EC = Reader.readStreamRef(SecContrSubstream,
+                                     Header->SecContrSubstreamSize))
+    return EC;
+  if (auto EC = Reader.readStreamRef(SecMapSubstream, Header->SectionMapSize))
+    return EC;
+  if (auto EC = Reader.readStreamRef(FileInfoSubstream, Header->FileInfoSize))
+    return EC;
+  if (auto EC =
+          Reader.readStreamRef(TypeServerMapSubstream, Header->TypeServerSize))
+    return EC;
+  if (auto EC = Reader.readStreamRef(ECSubstream, Header->ECSubstreamSize))
+    return EC;
+  if (auto EC = Reader.readArray(DbgStreams, Header->OptionalDbgHdrSize /
+                                                 sizeof(ulittle16_t)))
+    return EC;
+
+  if (auto EC = initializeSectionContributionData())
+    return EC;
+  if (auto EC = initializeSectionHeadersData())
+    return EC;
+  if (auto EC = initializeSectionMapData())
+    return EC;
+  if (auto EC = initializeFileInfo())
+    return EC;
+  if (auto EC = initializeFpoRecords())
+    return EC;
+
+  if (Reader.bytesRemaining() > 0)
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Found unexpected bytes in DBI Stream.");
+
+  if (ECSubstream.getLength() > 0) {
+    StreamReader ECReader(ECSubstream);
+    if (auto EC = ECNames.load(ECReader))
+      return EC;
+  }
+
+  return Error::success();
+}
+
+PdbRaw_DbiVer DbiStream::getDbiVersion() const {
+  uint32_t Value = Header->VersionHeader;
+  return static_cast<PdbRaw_DbiVer>(Value);
+}
+
+uint32_t DbiStream::getAge() const { return Header->Age; }
+
+uint16_t DbiStream::getPublicSymbolStreamIndex() const {
+  return Header->PublicSymbolStreamIndex;
+}
+
+uint16_t DbiStream::getGlobalSymbolStreamIndex() const {
+  return Header->GlobalSymbolStreamIndex;
+}
+
+uint16_t DbiStream::getFlags() const { return Header->Flags; }
+
+bool DbiStream::isIncrementallyLinked() const {
+  return (Header->Flags & FlagIncrementalMask) != 0;
+}
+
+bool DbiStream::hasCTypes() const {
+  return (Header->Flags & FlagHasCTypesMask) != 0;
+}
+
+bool DbiStream::isStripped() const {
+  return (Header->Flags & FlagStrippedMask) != 0;
+}
+
+uint16_t DbiStream::getBuildNumber() const { return Header->BuildNumber; }
+
+uint16_t DbiStream::getBuildMajorVersion() const {
+  return (Header->BuildNumber & BuildMajorMask) >> BuildMajorShift;
+}
+
+uint16_t DbiStream::getBuildMinorVersion() const {
+  return (Header->BuildNumber & BuildMinorMask) >> BuildMinorShift;
+}
+
+uint16_t DbiStream::getPdbDllRbld() const { return Header->PdbDllRbld; }
+
+uint32_t DbiStream::getPdbDllVersion() const { return Header->PdbDllVersion; }
+
+uint32_t DbiStream::getSymRecordStreamIndex() const {
+  return Header->SymRecordStreamIndex;
+}
+
+PDB_Machine DbiStream::getMachineType() const {
+  uint16_t Machine = Header->MachineType;
+  return static_cast<PDB_Machine>(Machine);
+}
+
+codeview::FixedStreamArray<object::coff_section>
+DbiStream::getSectionHeaders() {
+  return SectionHeaders;
+}
+
+codeview::FixedStreamArray<object::FpoData> DbiStream::getFpoRecords() {
+  return FpoRecords;
+}
+
+ArrayRef<ModuleInfoEx> DbiStream::modules() const { return ModuleInfos; }
+codeview::FixedStreamArray<SecMapEntry> DbiStream::getSectionMap() const {
+  return SectionMap;
+}
+
+void llvm::pdb::DbiStream::visitSectionContributions(
+    ISectionContribVisitor &Visitor) const {
+  if (SectionContribVersion == DbiSecContribVer60) {
+    for (auto &SC : SectionContribs)
+      Visitor.visit(SC);
+  } else if (SectionContribVersion == DbiSecContribV2) {
+    for (auto &SC : SectionContribs2)
+      Visitor.visit(SC);
+  }
+}
+
+Error DbiStream::initializeSectionContributionData() {
+  if (SecContrSubstream.getLength() == 0)
+    return Error::success();
+
+  StreamReader SCReader(SecContrSubstream);
+  if (auto EC = SCReader.readEnum(SectionContribVersion))
+    return EC;
+
+  if (SectionContribVersion == DbiSecContribVer60)
+    return loadSectionContribs<SectionContrib>(SectionContribs, SCReader);
+  if (SectionContribVersion == DbiSecContribV2)
+    return loadSectionContribs<SectionContrib2>(SectionContribs2, SCReader);
+
+  return make_error<RawError>(raw_error_code::feature_unsupported,
+                              "Unsupported DBI Section Contribution version");
+}
+
+// Initializes this->SectionHeaders.
+Error DbiStream::initializeSectionHeadersData() {
+  if (DbgStreams.size() == 0)
+    return Error::success();
+
+  uint32_t StreamNum = getDebugStreamIndex(DbgHeaderType::SectionHdr);
+  if (StreamNum >= Pdb.getNumStreams())
+    return make_error<RawError>(raw_error_code::no_stream);
+
+  auto SHS = MappedBlockStream::createIndexedStream(StreamNum, Pdb);
+  if (!SHS)
+    return SHS.takeError();
+
+  size_t StreamLen = (*SHS)->getLength();
+  if (StreamLen % sizeof(object::coff_section))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Corrupted section header stream.");
+
+  size_t NumSections = StreamLen / sizeof(object::coff_section);
+  codeview::StreamReader Reader(**SHS);
+  if (auto EC = Reader.readArray(SectionHeaders, NumSections))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Could not read a bitmap.");
+
+  SectionHeaderStream = std::move(*SHS);
+  return Error::success();
+}
+
+// Initializes this->Fpos.
+Error DbiStream::initializeFpoRecords() {
+  if (DbgStreams.size() == 0)
+    return Error::success();
+
+  uint32_t StreamNum = getDebugStreamIndex(DbgHeaderType::NewFPO);
+
+  // This means there is no FPO data.
+  if (StreamNum == InvalidStreamIndex)
+    return Error::success();
+
+  if (StreamNum >= Pdb.getNumStreams())
+    return make_error<RawError>(raw_error_code::no_stream);
+
+  auto FS = MappedBlockStream::createIndexedStream(StreamNum, Pdb);
+  if (!FS)
+    return FS.takeError();
+
+  size_t StreamLen = (*FS)->getLength();
+  if (StreamLen % sizeof(object::FpoData))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Corrupted New FPO stream.");
+
+  size_t NumRecords = StreamLen / sizeof(object::FpoData);
+  codeview::StreamReader Reader(**FS);
+  if (auto EC = Reader.readArray(FpoRecords, NumRecords))
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Corrupted New FPO stream.");
+  FpoStream = std::move(*FS);
+  return Error::success();
+}
+
+Error DbiStream::initializeSectionMapData() {
+  if (SecMapSubstream.getLength() == 0)
+    return Error::success();
+
+  StreamReader SMReader(SecMapSubstream);
+  const SecMapHeader *Header;
+  if (auto EC = SMReader.readObject(Header))
+    return EC;
+  if (auto EC = SMReader.readArray(SectionMap, Header->SecCount))
+    return EC;
+  return Error::success();
+}
+
+Error DbiStream::initializeFileInfo() {
+  // The layout of the FileInfoSubstream is like this:
+  // struct {
+  //   ulittle16_t NumModules;
+  //   ulittle16_t NumSourceFiles;
+  //   ulittle16_t ModIndices[NumModules];
+  //   ulittle16_t ModFileCounts[NumModules];
+  //   ulittle32_t FileNameOffsets[NumSourceFiles];
+  //   char Names[][NumSourceFiles];
+  // };
+  // with the caveat that `NumSourceFiles` cannot be trusted, so
+  // it is computed by summing `ModFileCounts`.
+  //
+  if (FileInfoSubstream.getLength() == 0)
+    return Error::success();
+
+  const FileInfoSubstreamHeader *FH;
+  StreamReader FISR(FileInfoSubstream);
+  if (auto EC = FISR.readObject(FH))
+    return EC;
+
+  // The number of modules in the stream should be the same as reported by
+  // the FileInfoSubstreamHeader.
+  if (FH->NumModules != ModuleInfos.size())
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "FileInfo substream count doesn't match DBI.");
+
+  FixedStreamArray<ulittle16_t> ModIndexArray;
+  FixedStreamArray<ulittle16_t> ModFileCountArray;
+
+  // First is an array of `NumModules` module indices.  This is not used for the
+  // same reason that `NumSourceFiles` is not used.  It's an array of uint16's,
+  // but it's possible there are more than 64k source files, which would imply
+  // more than 64k modules (e.g. object files) as well.  So we ignore this
+  // field.
+  if (auto EC = FISR.readArray(ModIndexArray, ModuleInfos.size()))
+    return EC;
+  if (auto EC = FISR.readArray(ModFileCountArray, ModuleInfos.size()))
+    return EC;
+
+  // Compute the real number of source files.
+  uint32_t NumSourceFiles = 0;
+  for (auto Count : ModFileCountArray)
+    NumSourceFiles += Count;
+
+  // This is the array that in the reference implementation corresponds to
+  // `ModInfo::FileLayout::FileNameOffs`, which is commented there as being a
+  // pointer. Due to the mentioned problems of pointers causing difficulty
+  // when reading from the file on 64-bit systems, we continue to ignore that
+  // field in `ModInfo`, and instead build a vector of StringRefs and stores
+  // them in `ModuleInfoEx`.  The value written to and read from the file is
+  // not used anyway, it is only there as a way to store the offsets for the
+  // purposes of later accessing the names at runtime.
+  if (auto EC = FISR.readArray(FileNameOffsets, NumSourceFiles))
+    return EC;
+
+  if (auto EC = FISR.readStreamRef(NamesBuffer))
+    return EC;
+
+  // We go through each ModuleInfo, determine the number N of source files for
+  // that module, and then get the next N offsets from the Offsets array, using
+  // them to get the corresponding N names from the Names buffer and associating
+  // each one with the corresponding module.
+  uint32_t NextFileIndex = 0;
+  for (size_t I = 0; I < ModuleInfos.size(); ++I) {
+    uint32_t NumFiles = ModFileCountArray[I];
+    ModuleInfos[I].SourceFiles.resize(NumFiles);
+    for (size_t J = 0; J < NumFiles; ++J, ++NextFileIndex) {
+      auto ThisName = getFileNameForIndex(NextFileIndex);
+      if (!ThisName)
+        return ThisName.takeError();
+      ModuleInfos[I].SourceFiles[J] = *ThisName;
+    }
+  }
+
+  return Error::success();
+}
+
+uint32_t DbiStream::getDebugStreamIndex(DbgHeaderType Type) const {
+  return DbgStreams[static_cast<uint16_t>(Type)];
+}
+
+Expected<StringRef> DbiStream::getFileNameForIndex(uint32_t Index) const {
+  StreamReader Names(NamesBuffer);
+  if (Index >= FileNameOffsets.size())
+    return make_error<RawError>(raw_error_code::index_out_of_bounds);
+
+  uint32_t FileOffset = FileNameOffsets[Index];
+  Names.setOffset(FileOffset);
+  StringRef Name;
+  if (auto EC = Names.readZeroString(Name))
+    return std::move(EC);
+  return Name;
+}
+
+Error DbiStream::commit() {
+  StreamWriter Writer(*Stream);
+  if (auto EC = Writer.writeObject(*Header))
+    return EC;
+
+  return Error::success();
+}