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, 464 insertions, 0 deletions

diff --git a/contrib/llvm/lib/MC/MCCodeView.cpp b/contrib/llvm/lib/MC/MCCodeView.cpp
new file mode 100644
index 0000000..65cff41
--- /dev/null
+++ b/contrib/llvm/lib/MC/MCCodeView.cpp
@@ -0,0 +1,464 @@
+//===- MCCodeView.h - Machine Code CodeView support -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Holds state from .cv_file and .cv_loc directives for later emission.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCCodeView.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/DebugInfo/CodeView/CodeView.h"
+#include "llvm/DebugInfo/CodeView/Line.h"
+#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/COFF.h"
+#include "llvm/Support/EndianStream.h"
+
+using namespace llvm;
+using namespace llvm::codeview;
+
+CodeViewContext::CodeViewContext() {}
+
+CodeViewContext::~CodeViewContext() {
+  // If someone inserted strings into the string table but never actually
+  // emitted them somewhere, clean up the fragment.
+  if (!InsertedStrTabFragment)
+    delete StrTabFragment;
+}
+
+/// This is a valid number for use with .cv_loc if we've already seen a .cv_file
+/// for it.
+bool CodeViewContext::isValidFileNumber(unsigned FileNumber) const {
+  unsigned Idx = FileNumber - 1;
+  if (Idx < Filenames.size())
+    return !Filenames[Idx].empty();
+  return false;
+}
+
+bool CodeViewContext::addFile(unsigned FileNumber, StringRef Filename) {
+  assert(FileNumber > 0);
+  Filename = addToStringTable(Filename);
+  unsigned Idx = FileNumber - 1;
+  if (Idx >= Filenames.size())
+    Filenames.resize(Idx + 1);
+
+  if (Filename.empty())
+    Filename = "<stdin>";
+
+  if (!Filenames[Idx].empty())
+    return false;
+
+  // FIXME: We should store the string table offset of the filename, rather than
+  // the filename itself for efficiency.
+  Filename = addToStringTable(Filename);
+
+  Filenames[Idx] = Filename;
+  return true;
+}
+
+MCDataFragment *CodeViewContext::getStringTableFragment() {
+  if (!StrTabFragment) {
+    StrTabFragment = new MCDataFragment();
+    // Start a new string table out with a null byte.
+    StrTabFragment->getContents().push_back('\0');
+  }
+  return StrTabFragment;
+}
+
+StringRef CodeViewContext::addToStringTable(StringRef S) {
+  SmallVectorImpl<char> &Contents = getStringTableFragment()->getContents();
+  auto Insertion =
+      StringTable.insert(std::make_pair(S, unsigned(Contents.size())));
+  // Return the string from the table, since it is stable.
+  S = Insertion.first->first();
+  if (Insertion.second) {
+    // The string map key is always null terminated.
+    Contents.append(S.begin(), S.end() + 1);
+  }
+  return S;
+}
+
+unsigned CodeViewContext::getStringTableOffset(StringRef S) {
+  // A string table offset of zero is always the empty string.
+  if (S.empty())
+    return 0;
+  auto I = StringTable.find(S);
+  assert(I != StringTable.end());
+  return I->second;
+}
+
+void CodeViewContext::emitStringTable(MCObjectStreamer &OS) {
+  MCContext &Ctx = OS.getContext();
+  MCSymbol *StringBegin = Ctx.createTempSymbol("strtab_begin", false),
+           *StringEnd = Ctx.createTempSymbol("strtab_end", false);
+
+  OS.EmitIntValue(unsigned(ModuleSubstreamKind::StringTable), 4);
+  OS.emitAbsoluteSymbolDiff(StringEnd, StringBegin, 4);
+  OS.EmitLabel(StringBegin);
+
+  // Put the string table data fragment here, if we haven't already put it
+  // somewhere else. If somebody wants two string tables in their .s file, one
+  // will just be empty.
+  if (!InsertedStrTabFragment) {
+    OS.insert(getStringTableFragment());
+    InsertedStrTabFragment = true;
+  }
+
+  OS.EmitValueToAlignment(4, 0);
+
+  OS.EmitLabel(StringEnd);
+}
+
+void CodeViewContext::emitFileChecksums(MCObjectStreamer &OS) {
+  // Do nothing if there are no file checksums. Microsoft's linker rejects empty
+  // CodeView substreams.
+  if (Filenames.empty())
+    return;
+
+  MCContext &Ctx = OS.getContext();
+  MCSymbol *FileBegin = Ctx.createTempSymbol("filechecksums_begin", false),
+           *FileEnd = Ctx.createTempSymbol("filechecksums_end", false);
+
+  OS.EmitIntValue(unsigned(ModuleSubstreamKind::FileChecksums), 4);
+  OS.emitAbsoluteSymbolDiff(FileEnd, FileBegin, 4);
+  OS.EmitLabel(FileBegin);
+
+  // Emit an array of FileChecksum entries. We index into this table using the
+  // user-provided file number. Each entry is currently 8 bytes, as we don't
+  // emit checksums.
+  for (StringRef Filename : Filenames) {
+    OS.EmitIntValue(getStringTableOffset(Filename), 4);
+    // Zero the next two fields and align back to 4 bytes. This indicates that
+    // no checksum is present.
+    OS.EmitIntValue(0, 4);
+  }
+
+  OS.EmitLabel(FileEnd);
+}
+
+void CodeViewContext::emitLineTableForFunction(MCObjectStreamer &OS,
+                                               unsigned FuncId,
+                                               const MCSymbol *FuncBegin,
+                                               const MCSymbol *FuncEnd) {
+  MCContext &Ctx = OS.getContext();
+  MCSymbol *LineBegin = Ctx.createTempSymbol("linetable_begin", false),
+           *LineEnd = Ctx.createTempSymbol("linetable_end", false);
+
+  OS.EmitIntValue(unsigned(ModuleSubstreamKind::Lines), 4);
+  OS.emitAbsoluteSymbolDiff(LineEnd, LineBegin, 4);
+  OS.EmitLabel(LineBegin);
+  OS.EmitCOFFSecRel32(FuncBegin);
+  OS.EmitCOFFSectionIndex(FuncBegin);
+
+  // Actual line info.
+  std::vector<MCCVLineEntry> Locs = getFunctionLineEntries(FuncId);
+  bool HaveColumns = any_of(Locs, [](const MCCVLineEntry &LineEntry) {
+    return LineEntry.getColumn() != 0;
+  });
+  OS.EmitIntValue(HaveColumns ? int(LineFlags::HaveColumns) : 0, 2);
+  OS.emitAbsoluteSymbolDiff(FuncEnd, FuncBegin, 4);
+
+  for (auto I = Locs.begin(), E = Locs.end(); I != E;) {
+    // Emit a file segment for the run of locations that share a file id.
+    unsigned CurFileNum = I->getFileNum();
+    auto FileSegEnd =
+        std::find_if(I, E, [CurFileNum](const MCCVLineEntry &Loc) {
+          return Loc.getFileNum() != CurFileNum;
+        });
+    unsigned EntryCount = FileSegEnd - I;
+    OS.AddComment("Segment for file '" + Twine(Filenames[CurFileNum - 1]) +
+                  "' begins");
+    OS.EmitIntValue(8 * (CurFileNum - 1), 4);
+    OS.EmitIntValue(EntryCount, 4);
+    uint32_t SegmentSize = 12;
+    SegmentSize += 8 * EntryCount;
+    if (HaveColumns)
+      SegmentSize += 4 * EntryCount;
+    OS.EmitIntValue(SegmentSize, 4);
+
+    for (auto J = I; J != FileSegEnd; ++J) {
+      OS.emitAbsoluteSymbolDiff(J->getLabel(), FuncBegin, 4);
+      unsigned LineData = J->getLine();
+      if (J->isStmt())
+        LineData |= LineInfo::StatementFlag;
+      OS.EmitIntValue(LineData, 4);
+    }
+    if (HaveColumns) {
+      for (auto J = I; J != FileSegEnd; ++J) {
+        OS.EmitIntValue(J->getColumn(), 2);
+        OS.EmitIntValue(0, 2);
+      }
+    }
+    I = FileSegEnd;
+  }
+  OS.EmitLabel(LineEnd);
+}
+
+static bool compressAnnotation(uint32_t Data, SmallVectorImpl<char> &Buffer) {
+  if (isUInt<7>(Data)) {
+    Buffer.push_back(Data);
+    return true;
+  }
+
+  if (isUInt<14>(Data)) {
+    Buffer.push_back((Data >> 8) | 0x80);
+    Buffer.push_back(Data & 0xff);
+    return true;
+  }
+
+  if (isUInt<29>(Data)) {
+    Buffer.push_back((Data >> 24) | 0xC0);
+    Buffer.push_back((Data >> 16) & 0xff);
+    Buffer.push_back((Data >> 8) & 0xff);
+    Buffer.push_back(Data & 0xff);
+    return true;
+  }
+
+  return false;
+}
+
+static bool compressAnnotation(BinaryAnnotationsOpCode Annotation,
+                               SmallVectorImpl<char> &Buffer) {
+  return compressAnnotation(static_cast<uint32_t>(Annotation), Buffer);
+}
+
+static uint32_t encodeSignedNumber(uint32_t Data) {
+  if (Data >> 31)
+    return ((-Data) << 1) | 1;
+  return Data << 1;
+}
+
+void CodeViewContext::emitInlineLineTableForFunction(
+    MCObjectStreamer &OS, unsigned PrimaryFunctionId, unsigned SourceFileId,
+    unsigned SourceLineNum, const MCSymbol *FnStartSym,
+    const MCSymbol *FnEndSym, ArrayRef<unsigned> SecondaryFunctionIds) {
+  // Create and insert a fragment into the current section that will be encoded
+  // later.
+  new MCCVInlineLineTableFragment(
+      PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym,
+      SecondaryFunctionIds, OS.getCurrentSectionOnly());
+}
+
+void CodeViewContext::emitDefRange(
+    MCObjectStreamer &OS,
+    ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
+    StringRef FixedSizePortion) {
+  // Create and insert a fragment into the current section that will be encoded
+  // later.
+  new MCCVDefRangeFragment(Ranges, FixedSizePortion,
+                           OS.getCurrentSectionOnly());
+}
+
+static unsigned computeLabelDiff(MCAsmLayout &Layout, const MCSymbol *Begin,
+                                 const MCSymbol *End) {
+  MCContext &Ctx = Layout.getAssembler().getContext();
+  MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+  const MCExpr *BeginRef = MCSymbolRefExpr::create(Begin, Variant, Ctx),
+               *EndRef = MCSymbolRefExpr::create(End, Variant, Ctx);
+  const MCExpr *AddrDelta =
+      MCBinaryExpr::create(MCBinaryExpr::Sub, EndRef, BeginRef, Ctx);
+  int64_t Result;
+  bool Success = AddrDelta->evaluateKnownAbsolute(Result, Layout);
+  assert(Success && "failed to evaluate label difference as absolute");
+  (void)Success;
+  assert(Result >= 0 && "negative label difference requested");
+  assert(Result < UINT_MAX && "label difference greater than 2GB");
+  return unsigned(Result);
+}
+
+void CodeViewContext::encodeInlineLineTable(MCAsmLayout &Layout,
+                                            MCCVInlineLineTableFragment &Frag) {
+  size_t LocBegin;
+  size_t LocEnd;
+  std::tie(LocBegin, LocEnd) = getLineExtent(Frag.SiteFuncId);
+  for (unsigned SecondaryId : Frag.SecondaryFuncs) {
+    auto Extent = getLineExtent(SecondaryId);
+    LocBegin = std::min(LocBegin, Extent.first);
+    LocEnd = std::max(LocEnd, Extent.second);
+  }
+  if (LocBegin >= LocEnd)
+    return;
+  ArrayRef<MCCVLineEntry> Locs = getLinesForExtent(LocBegin, LocEnd);
+  if (Locs.empty())
+    return;
+
+  SmallSet<unsigned, 8> InlinedFuncIds;
+  InlinedFuncIds.insert(Frag.SiteFuncId);
+  InlinedFuncIds.insert(Frag.SecondaryFuncs.begin(), Frag.SecondaryFuncs.end());
+
+  // Make an artificial start location using the function start and the inlinee
+  // lines start location information. All deltas start relative to this
+  // location.
+  MCCVLineEntry StartLoc(Frag.getFnStartSym(), MCCVLoc(Locs.front()));
+  StartLoc.setFileNum(Frag.StartFileId);
+  StartLoc.setLine(Frag.StartLineNum);
+  const MCCVLineEntry *LastLoc = &StartLoc;
+  bool HaveOpenRange = false;
+
+  SmallVectorImpl<char> &Buffer = Frag.getContents();
+  Buffer.clear(); // Clear old contents if we went through relaxation.
+  for (const MCCVLineEntry &Loc : Locs) {
+    if (!InlinedFuncIds.count(Loc.getFunctionId())) {
+      // We've hit a cv_loc not attributed to this inline call site. Use this
+      // label to end the PC range.
+      if (HaveOpenRange) {
+        unsigned Length =
+            computeLabelDiff(Layout, LastLoc->getLabel(), Loc.getLabel());
+        compressAnnotation(BinaryAnnotationsOpCode::ChangeCodeLength, Buffer);
+        compressAnnotation(Length, Buffer);
+      }
+      HaveOpenRange = false;
+      continue;
+    }
+
+    // If we've already opened the function and we're at an indirectly inlined
+    // location, continue until the next directly inlined location.
+    bool DirectlyInlined = Loc.getFunctionId() == Frag.SiteFuncId;
+    if (!DirectlyInlined && HaveOpenRange)
+      continue;
+    HaveOpenRange = true;
+
+    if (Loc.getFileNum() != LastLoc->getFileNum()) {
+      // File ids are 1 based, and each file checksum table entry is 8 bytes
+      // long. See emitFileChecksums above.
+      unsigned FileOffset = 8 * (Loc.getFileNum() - 1);
+      compressAnnotation(BinaryAnnotationsOpCode::ChangeFile, Buffer);
+      compressAnnotation(FileOffset, Buffer);
+    }
+
+    int LineDelta = Loc.getLine() - LastLoc->getLine();
+    if (LineDelta == 0)
+      continue;
+
+    unsigned EncodedLineDelta = encodeSignedNumber(LineDelta);
+    unsigned CodeDelta =
+        computeLabelDiff(Layout, LastLoc->getLabel(), Loc.getLabel());
+    if (CodeDelta == 0) {
+      compressAnnotation(BinaryAnnotationsOpCode::ChangeLineOffset, Buffer);
+      compressAnnotation(EncodedLineDelta, Buffer);
+    } else if (EncodedLineDelta < 0x8 && CodeDelta <= 0xf) {
+      // The ChangeCodeOffsetAndLineOffset combination opcode is used when the
+      // encoded line delta uses 3 or fewer set bits and the code offset fits
+      // in one nibble.
+      unsigned Operand = (EncodedLineDelta << 4) | CodeDelta;
+      compressAnnotation(BinaryAnnotationsOpCode::ChangeCodeOffsetAndLineOffset,
+                         Buffer);
+      compressAnnotation(Operand, Buffer);
+    } else {
+      // Otherwise use the separate line and code deltas.
+      compressAnnotation(BinaryAnnotationsOpCode::ChangeLineOffset, Buffer);
+      compressAnnotation(EncodedLineDelta, Buffer);
+      compressAnnotation(BinaryAnnotationsOpCode::ChangeCodeOffset, Buffer);
+      compressAnnotation(CodeDelta, Buffer);
+    }
+
+    LastLoc = &Loc;
+  }
+
+  assert(HaveOpenRange);
+
+  unsigned EndSymLength =
+      computeLabelDiff(Layout, LastLoc->getLabel(), Frag.getFnEndSym());
+  unsigned LocAfterLength = ~0U;
+  ArrayRef<MCCVLineEntry> LocAfter = getLinesForExtent(LocEnd, LocEnd + 1);
+  if (!LocAfter.empty()) {
+    // Only try to compute this difference if we're in the same section.
+    const MCCVLineEntry &Loc = LocAfter[0];
+    if (&Loc.getLabel()->getSection(false) ==
+        &LastLoc->getLabel()->getSection(false)) {
+      LocAfterLength =
+          computeLabelDiff(Layout, LastLoc->getLabel(), Loc.getLabel());
+    }
+  }
+
+  compressAnnotation(BinaryAnnotationsOpCode::ChangeCodeLength, Buffer);
+  compressAnnotation(std::min(EndSymLength, LocAfterLength), Buffer);
+}
+
+void CodeViewContext::encodeDefRange(MCAsmLayout &Layout,
+                                     MCCVDefRangeFragment &Frag) {
+  MCContext &Ctx = Layout.getAssembler().getContext();
+  SmallVectorImpl<char> &Contents = Frag.getContents();
+  Contents.clear();
+  SmallVectorImpl<MCFixup> &Fixups = Frag.getFixups();
+  Fixups.clear();
+  raw_svector_ostream OS(Contents);
+
+  // Write down each range where the variable is defined.
+  for (std::pair<const MCSymbol *, const MCSymbol *> Range : Frag.getRanges()) {
+    unsigned RangeSize = computeLabelDiff(Layout, Range.first, Range.second);
+    unsigned Bias = 0;
+    // We must split the range into chunks of MaxDefRange, this is a fundamental
+    // limitation of the file format.
+    do {
+      uint16_t Chunk = std::min((uint32_t)MaxDefRange, RangeSize);
+
+      const MCSymbolRefExpr *SRE = MCSymbolRefExpr::create(Range.first, Ctx);
+      const MCBinaryExpr *BE =
+          MCBinaryExpr::createAdd(SRE, MCConstantExpr::create(Bias, Ctx), Ctx);
+      MCValue Res;
+      BE->evaluateAsRelocatable(Res, &Layout, /*Fixup=*/nullptr);
+
+      // Each record begins with a 2-byte number indicating how large the record
+      // is.
+      StringRef FixedSizePortion = Frag.getFixedSizePortion();
+      // Our record is a fixed sized prefix and a LocalVariableAddrRange that we
+      // are artificially constructing.
+      size_t RecordSize =
+          FixedSizePortion.size() + sizeof(LocalVariableAddrRange);
+      // Write out the recrod size.
+      support::endian::Writer<support::little>(OS).write<uint16_t>(RecordSize);
+      // Write out the fixed size prefix.
+      OS << FixedSizePortion;
+      // Make space for a fixup that will eventually have a section relative
+      // relocation pointing at the offset where the variable becomes live.
+      Fixups.push_back(MCFixup::create(Contents.size(), BE, FK_SecRel_4));
+      Contents.resize(Contents.size() + 4); // Fixup for code start.
+      // Make space for a fixup that will record the section index for the code.
+      Fixups.push_back(MCFixup::create(Contents.size(), BE, FK_SecRel_2));
+      Contents.resize(Contents.size() + 2); // Fixup for section index.
+      // Write down the range's extent.
+      support::endian::Writer<support::little>(OS).write<uint16_t>(Chunk);
+
+      // Move on to the next range.
+      Bias += Chunk;
+      RangeSize -= Chunk;
+    } while (RangeSize > 0);
+  }
+}
+
+//
+// This is called when an instruction is assembled into the specified section
+// and if there is information from the last .cv_loc directive that has yet to have
+// a line entry made for it is made.
+//
+void MCCVLineEntry::Make(MCObjectStreamer *MCOS) {
+  if (!MCOS->getContext().getCVLocSeen())
+    return;
+
+  // Create a symbol at in the current section for use in the line entry.
+  MCSymbol *LineSym = MCOS->getContext().createTempSymbol();
+  // Set the value of the symbol to use for the MCCVLineEntry.
+  MCOS->EmitLabel(LineSym);
+
+  // Get the current .loc info saved in the context.
+  const MCCVLoc &CVLoc = MCOS->getContext().getCurrentCVLoc();
+
+  // Create a (local) line entry with the symbol and the current .loc info.
+  MCCVLineEntry LineEntry(LineSym, CVLoc);
+
+  // clear CVLocSeen saying the current .loc info is now used.
+  MCOS->getContext().clearCVLocSeen();
+
+  // Add the line entry to this section's entries.
+  MCOS->getContext().getCVContext().addLineEntry(LineEntry);
+}