Vendor import of llvm trunk r241361:

https://llvm.org/svn/llvm-project/llvm/trunk@241361

35 files changed, 261 insertions, 119 deletions

diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 48830e8..4b0a0e5 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -90,7 +90,7 @@ namespace llvm {
   const unsigned int maxPowerOfFiveExponent = maxExponent + maxPrecision - 1;
   const unsigned int maxPowerOfFiveParts = 2 + ((maxPowerOfFiveExponent * 815)
                                                 / (351 * integerPartWidth));
-} // namespace llvm
+}
 
 /* A bunch of private, handy routines.  */
 
@@ -3539,7 +3539,7 @@ namespace {
     exp += FirstSignificant;
     buffer.erase(&buffer[0], &buffer[FirstSignificant]);
   }
-} // namespace
+}
 
 void APFloat::toString(SmallVectorImpl<char> &Str,
                        unsigned FormatPrecision,
diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index aa026d4..23f89bb 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -2331,7 +2331,7 @@ namespace {
   {
     return findFirstSet(value, ZB_Max);
   }
-} // namespace
+}
 
 /* Sets the least significant part of a bignum to the input value, and
    zeroes out higher parts.  */
diff --git a/lib/Support/APSInt.cpp b/lib/Support/APSInt.cpp
index 73acafa..975457c 100644
--- a/lib/Support/APSInt.cpp
+++ b/lib/Support/APSInt.cpp
@@ -17,6 +17,25 @@
 
 using namespace llvm;
 
+APSInt::APSInt(StringRef Str) {
+  assert(!Str.empty() && "Invalid string length");
+
+  // (Over-)estimate the required number of bits.
+  unsigned NumBits = ((Str.size() * 64) / 19) + 2;
+  APInt Tmp(NumBits, Str, /*Radix=*/10);
+  if (Str[0] == '-') {
+    unsigned MinBits = Tmp.getMinSignedBits();
+    if (MinBits > 0 && MinBits < NumBits)
+      Tmp = Tmp.trunc(MinBits);
+    *this = APSInt(Tmp, /*IsUnsigned=*/false);
+    return;
+  }
+  unsigned ActiveBits = Tmp.getActiveBits();
+  if (ActiveBits > 0 && ActiveBits < NumBits)
+    Tmp = Tmp.trunc(ActiveBits);
+  *this = APSInt(Tmp, /*IsUnsigned=*/true);
+}
+
 void APSInt::Profile(FoldingSetNodeID& ID) const {
   ID.AddInteger((unsigned) (IsUnsigned ? 1 : 0));
   APInt::Profile(ID);
diff --git a/lib/Support/ARMBuildAttrs.cpp b/lib/Support/ARMBuildAttrs.cpp
index 9c8bb15..960a0f1 100644
--- a/lib/Support/ARMBuildAttrs.cpp
+++ b/lib/Support/ARMBuildAttrs.cpp
@@ -66,7 +66,7 @@ const struct {
   { ARMBuildAttrs::ABI_align_needed, "Tag_ABI_align8_needed" },
   { ARMBuildAttrs::ABI_align_preserved, "Tag_ABI_align8_preserved" },
 };
-} // namespace
+}
 
 namespace llvm {
 namespace ARMBuildAttrs {
@@ -90,6 +90,6 @@ int AttrTypeFromString(StringRef Tag) {
       return ARMAttributeTags[TI].Attr;
   return -1;
 }
-} // namespace ARMBuildAttrs
-} // namespace llvm
+}
+}
 
diff --git a/lib/Support/ARMWinEH.cpp b/lib/Support/ARMWinEH.cpp
index 8d21ca5..03c150f 100644
--- a/lib/Support/ARMWinEH.cpp
+++ b/lib/Support/ARMWinEH.cpp
@@ -32,7 +32,7 @@ std::pair<uint16_t, uint32_t> SavedRegisterMask(const RuntimeFunction &RF) {
 
   return std::make_pair(GPRMask, VFPMask);
 }
-} // namespace WinEH
-} // namespace ARM
-} // namespace llvm
+}
+}
+}
 
diff --git a/lib/Support/Allocator.cpp b/lib/Support/Allocator.cpp
index 021037a..f48edac 100644
--- a/lib/Support/Allocator.cpp
+++ b/lib/Support/Allocator.cpp
@@ -37,4 +37,4 @@ void PrintRecyclerStats(size_t Size,
          << "Number of elements free for recycling: " << FreeListSize << '\n';
 }
 
-} // namespace llvm
+}
diff --git a/lib/Support/CMakeLists.txt b/lib/Support/CMakeLists.txt
index eac189b..a8a4df5 100644
--- a/lib/Support/CMakeLists.txt
+++ b/lib/Support/CMakeLists.txt
@@ -1,7 +1,7 @@
 set(system_libs)
 if( NOT MSVC )
   if( MINGW )
-    set(system_libs ${system_libs} imagehlp psapi shell32 ole32)
+    set(system_libs ${system_libs} psapi shell32 ole32)
   elseif( CMAKE_HOST_UNIX )
     if( HAVE_LIBRT )
       set(system_libs ${system_libs} rt)
diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index 3638f0d..dcaacf6 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -61,8 +61,8 @@ TEMPLATE_INSTANTIATION(class opt<int>);
 TEMPLATE_INSTANTIATION(class opt<std::string>);
 TEMPLATE_INSTANTIATION(class opt<char>);
 TEMPLATE_INSTANTIATION(class opt<bool>);
-} // namespace cl
-} // namespace llvm
+}
+} // end namespace llvm::cl
 
 // Pin the vtables to this file.
 void GenericOptionValue::anchor() {}
diff --git a/lib/Support/CrashRecoveryContext.cpp b/lib/Support/CrashRecoveryContext.cpp
index 929f5da..aba0f1d 100644
--- a/lib/Support/CrashRecoveryContext.cpp
+++ b/lib/Support/CrashRecoveryContext.cpp
@@ -60,7 +60,7 @@ public:
   }
 };
 
-} // namespace
+}
 
 static ManagedStatic<sys::Mutex> gCrashRecoveryContextMutex;
 static bool gCrashRecoveryEnabled = false;
diff --git a/lib/Support/DAGDeltaAlgorithm.cpp b/lib/Support/DAGDeltaAlgorithm.cpp
index 0f44780..f1a334b 100644
--- a/lib/Support/DAGDeltaAlgorithm.cpp
+++ b/lib/Support/DAGDeltaAlgorithm.cpp
@@ -175,7 +175,7 @@ public:
       : DDAI(DDAI), Required(Required) {}
 };
 
-} // namespace
+}
 
 DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
     DAGDeltaAlgorithm &DDA, const changeset_ty &Changes,
diff --git a/lib/Support/DataStream.cpp b/lib/Support/DataStream.cpp
index ad05494..3b10fc5 100644
--- a/lib/Support/DataStream.cpp
+++ b/lib/Support/DataStream.cpp
@@ -72,7 +72,7 @@ public:
   }
 };
 
-} // namespace
+}
 
 std::unique_ptr<DataStreamer>
 llvm::getDataFileStreamer(const std::string &Filename, std::string *StrError) {
diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
index 2052662..47751fc 100644
--- a/lib/Support/Debug.cpp
+++ b/lib/Support/Debug.cpp
@@ -99,7 +99,7 @@ struct DebugOnlyOpt {
   }
 };
 
-} // namespace
+}
 
 static DebugOnlyOpt DebugOnlyOptLoc;
 
diff --git a/lib/Support/Dwarf.cpp b/lib/Support/Dwarf.cpp
index 6229825..13a4155 100644
--- a/lib/Support/Dwarf.cpp
+++ b/lib/Support/Dwarf.cpp
@@ -190,6 +190,9 @@ const char *llvm::dwarf::AttributeString(unsigned Attribute) {
   case DW_AT_APPLE_property_attribute:   return "DW_AT_APPLE_property_attribute";
   case DW_AT_APPLE_property:             return "DW_AT_APPLE_property";
   case DW_AT_APPLE_objc_complete_type:   return "DW_AT_APPLE_objc_complete_type";
+  case DW_AT_LLVM_include_path:          return "DW_AT_LLVM_include_path";
+  case DW_AT_LLVM_config_macros:         return "DW_AT_LLVM_config_macros";
+  case DW_AT_LLVM_isysroot:              return "DW_AT_LLVM_isysroot";
 
     // DWARF5 Fission Extension Attribute
   case DW_AT_GNU_dwo_name:               return "DW_AT_GNU_dwo_name";
diff --git a/lib/Support/FileOutputBuffer.cpp b/lib/Support/FileOutputBuffer.cpp
index 6f064c9..307ff09 100644
--- a/lib/Support/FileOutputBuffer.cpp
+++ b/lib/Support/FileOutputBuffer.cpp
@@ -109,4 +109,4 @@ std::error_code FileOutputBuffer::commit() {
   // Rename file to final name.
   return sys::fs::rename(Twine(TempPath), Twine(FinalPath));
 }
-} // namespace llvm
+} // namespace
diff --git a/lib/Support/GraphWriter.cpp b/lib/Support/GraphWriter.cpp
index 97aedc8..a9b0220 100644
--- a/lib/Support/GraphWriter.cpp
+++ b/lib/Support/GraphWriter.cpp
@@ -135,12 +135,12 @@ static const char *getProgramName(GraphProgram::Name program) {
 bool llvm::DisplayGraph(StringRef FilenameRef, bool wait,
                         GraphProgram::Name program) {
   std::string Filename = FilenameRef;
-  wait &= !ViewBackground;
   std::string ErrMsg;
   std::string ViewerPath;
   GraphSession S;
 
 #ifdef __APPLE__
+  wait &= !ViewBackground;
   if (S.TryFindProgram("open", ViewerPath)) {
     std::vector<const char *> args;
     args.push_back(ViewerPath.c_str());
diff --git a/lib/Support/LockFileManager.cpp b/lib/Support/LockFileManager.cpp
index d07c5f0..fb81d60 100644
--- a/lib/Support/LockFileManager.cpp
+++ b/lib/Support/LockFileManager.cpp
@@ -12,6 +12,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Signals.h"
 #include <sys/stat.h>
 #include <sys/types.h>
 #if LLVM_ON_WIN32
@@ -20,6 +21,16 @@
 #if LLVM_ON_UNIX
 #include <unistd.h>
 #endif
+
+#if defined(__APPLE__) && defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && (__MAC_OS_X_VERSION_MIN_REQUIRED > 1050)
+#define USE_OSX_GETHOSTUUID 1
+#else
+#define USE_OSX_GETHOSTUUID 0
+#endif
+
+#if USE_OSX_GETHOSTUUID
+#include <uuid/uuid.h>
+#endif
 using namespace llvm;
 
 /// \brief Attempt to read the lock file with the given name, if it exists.
@@ -55,20 +66,80 @@ LockFileManager::readLockFile(StringRef LockFileName) {
   return None;
 }
 
-bool LockFileManager::processStillExecuting(StringRef Hostname, int PID) {
+static std::error_code getHostID(SmallVectorImpl<char> &HostID) {
+  HostID.clear();
+
+#if USE_OSX_GETHOSTUUID
+  // On OS X, use the more stable hardware UUID instead of hostname.
+  struct timespec wait = {1, 0}; // 1 second.
+  uuid_t uuid;
+  if (gethostuuid(uuid, &wait) != 0)
+    return std::error_code(errno, std::system_category());
+
+  uuid_string_t UUIDStr;
+  uuid_unparse(uuid, UUIDStr);
+  StringRef UUIDRef(UUIDStr);
+  HostID.append(UUIDRef.begin(), UUIDRef.end());
+
+#elif LLVM_ON_UNIX
+  char HostName[256];
+  HostName[255] = 0;
+  HostName[0] = 0;
+  gethostname(HostName, 255);
+  StringRef HostNameRef(HostName);
+  HostID.append(HostNameRef.begin(), HostNameRef.end());
+
+#else
+  StringRef Dummy("localhost");
+  HostID.append(Dummy.begin(), Dummy.end());
+#endif
+
+  return std::error_code();
+}
+
+bool LockFileManager::processStillExecuting(StringRef HostID, int PID) {
 #if LLVM_ON_UNIX && !defined(__ANDROID__)
-  char MyHostname[256];
-  MyHostname[255] = 0;
-  MyHostname[0] = 0;
-  gethostname(MyHostname, 255);
+  SmallString<256> StoredHostID;
+  if (getHostID(StoredHostID))
+    return true; // Conservatively assume it's executing on error.
+
   // Check whether the process is dead. If so, we're done.
-  if (MyHostname == Hostname && getsid(PID) == -1 && errno == ESRCH)
+  if (StoredHostID == HostID && getsid(PID) == -1 && errno == ESRCH)
     return false;
 #endif
 
   return true;
 }
 
+namespace {
+/// An RAII helper object ensure that the unique lock file is removed.
+///
+/// Ensures that if there is an error or a signal before we finish acquiring the
+/// lock, the unique file will be removed. And if we successfully take the lock,
+/// the signal handler is left in place so that signals while the lock is held
+/// will remove the unique lock file. The caller should ensure there is a
+/// matching call to sys::DontRemoveFileOnSignal when the lock is released.
+class RemoveUniqueLockFileOnSignal {
+  StringRef Filename;
+  bool RemoveImmediately;
+public:
+  RemoveUniqueLockFileOnSignal(StringRef Name)
+  : Filename(Name), RemoveImmediately(true) {
+    sys::RemoveFileOnSignal(Filename, nullptr);
+  }
+  ~RemoveUniqueLockFileOnSignal() {
+    if (!RemoveImmediately) {
+      // Leave the signal handler enabled. It will be removed when the lock is
+      // released.
+      return;
+    }
+    sys::fs::remove(Filename);
+    sys::DontRemoveFileOnSignal(Filename);
+  }
+  void lockAcquired() { RemoveImmediately = false; }
+};
+} // end anonymous namespace
+
 LockFileManager::LockFileManager(StringRef FileName)
 {
   this->FileName = FileName;
@@ -96,17 +167,18 @@ LockFileManager::LockFileManager(StringRef FileName)
 
   // Write our process ID to our unique lock file.
   {
-    raw_fd_ostream Out(UniqueLockFileID, /*shouldClose=*/true);
+    SmallString<256> HostID;
+    if (auto EC = getHostID(HostID)) {
+      Error = EC;
+      return;
+    }
 
+    raw_fd_ostream Out(UniqueLockFileID, /*shouldClose=*/true);
+    Out << HostID << ' ';
 #if LLVM_ON_UNIX
-    // FIXME: move getpid() call into LLVM
-    char hostname[256];
-    hostname[255] = 0;
-    hostname[0] = 0;
-    gethostname(hostname, 255);
-    Out << hostname << ' ' << getpid();
+    Out << getpid();
 #else
-    Out << "localhost 1";
+    Out << "1";
 #endif
     Out.close();
 
@@ -119,12 +191,18 @@ LockFileManager::LockFileManager(StringRef FileName)
     }
   }
 
+  // Clean up the unique file on signal, which also releases the lock if it is
+  // held since the .lock symlink will point to a nonexistent file.
+  RemoveUniqueLockFileOnSignal RemoveUniqueFile(UniqueLockFileName);
+
   while (1) {
     // Create a link from the lock file name. If this succeeds, we're done.
     std::error_code EC =
         sys::fs::create_link(UniqueLockFileName, LockFileName);
-    if (!EC)
+    if (!EC) {
+      RemoveUniqueFile.lockAcquired();
       return;
+    }
 
     if (EC != errc::file_exists) {
       Error = EC;
@@ -171,6 +249,9 @@ LockFileManager::~LockFileManager() {
   // Since we own the lock, remove the lock file and our own unique lock file.
   sys::fs::remove(LockFileName);
   sys::fs::remove(UniqueLockFileName);
+  // The unique file is now gone, so remove it from the signal handler. This
+  // matches a sys::RemoveFileOnSignal() in LockFileManager().
+  sys::DontRemoveFileOnSignal(UniqueLockFileName);
 }
 
 LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
diff --git a/lib/Support/MD5.cpp b/lib/Support/MD5.cpp
index 6ed81fb..ceab580 100644
--- a/lib/Support/MD5.cpp
+++ b/lib/Support/MD5.cpp
@@ -283,4 +283,4 @@ void MD5::stringifyResult(MD5Result &Result, SmallString<32> &Str) {
     Res << format("%.2x", Result[i]);
 }
 
-} // namespace llvm
+}
diff --git a/lib/Support/MathExtras.cpp b/lib/Support/MathExtras.cpp
index 9265a43..ba09245 100644
--- a/lib/Support/MathExtras.cpp
+++ b/lib/Support/MathExtras.cpp
@@ -29,4 +29,4 @@ namespace llvm {
   const float huge_valf = HUGE_VALF;
 #endif
 
-} // namespace llvm
+}
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 1d69b96..98862e9 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -94,7 +94,7 @@ public:
     return MemoryBuffer_Malloc;
   }
 };
-} // namespace
+}
 
 static ErrorOr<std::unique_ptr<MemoryBuffer>>
 getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize, 
@@ -220,7 +220,7 @@ public:
     return MemoryBuffer_MMap;
   }
 };
-} // namespace
+}
 
 static ErrorOr<std::unique_ptr<MemoryBuffer>>
 getMemoryBufferForStream(int FD, const Twine &BufferName) {
diff --git a/lib/Support/Mutex.cpp b/lib/Support/Mutex.cpp
index 42867c9..c8d3844 100644
--- a/lib/Support/Mutex.cpp
+++ b/lib/Support/Mutex.cpp
@@ -110,7 +110,7 @@ MutexImpl::tryacquire()
   return errorcode == 0;
 }
 
-} // namespace llvm
+}
 
 #elif defined(LLVM_ON_UNIX)
 #include "Unix/Mutex.inc"
diff --git a/lib/Support/RWMutex.cpp b/lib/Support/RWMutex.cpp
index 21ba5a4..3b6309c 100644
--- a/lib/Support/RWMutex.cpp
+++ b/lib/Support/RWMutex.cpp
@@ -113,7 +113,7 @@ RWMutexImpl::writer_release()
   return errorcode == 0;
 }
 
-} // namespace llvm
+}
 
 #elif defined(LLVM_ON_UNIX)
 #include "Unix/RWMutex.inc"
diff --git a/lib/Support/Statistic.cpp b/lib/Support/Statistic.cpp
index 90f5fdb..56c3b0f 100644
--- a/lib/Support/Statistic.cpp
+++ b/lib/Support/Statistic.cpp
@@ -60,7 +60,7 @@ public:
     Stats.push_back(S);
   }
 };
-} // namespace
+}
 
 static ManagedStatic<StatisticInfo> StatInfo;
 static ManagedStatic<sys::SmartMutex<true> > StatLock;
diff --git a/lib/Support/StreamingMemoryObject.cpp b/lib/Support/StreamingMemoryObject.cpp
index 891aa66..5a44e62 100644
--- a/lib/Support/StreamingMemoryObject.cpp
+++ b/lib/Support/StreamingMemoryObject.cpp
@@ -129,4 +129,4 @@ StreamingMemoryObject::StreamingMemoryObject(
       BytesSkipped(0), ObjectSize(0), EOFReached(false) {
   BytesRead = this->Streamer->GetBytes(&Bytes[0], kChunkSize);
 }
-} // namespace llvm
+}
diff --git a/lib/Support/TargetParser.cpp b/lib/Support/TargetParser.cpp
index 760cdc1..4d4c041 100644
--- a/lib/Support/TargetParser.cpp
+++ b/lib/Support/TargetParser.cpp
@@ -25,31 +25,37 @@ namespace {
 // List of canonical FPU names (use getFPUSynonym) and which architectural
 // features they correspond to (use getFPUFeatures).
 // FIXME: TableGen this.
+// The entries must appear in the order listed in ARM::FPUKind for correct indexing
 struct {
   const char * Name;
   ARM::FPUKind ID;
-  unsigned FPUVersion; ///< Corresponds directly to the FP arch version number.
+  ARM::FPUVersion FPUVersion;
   ARM::NeonSupportLevel NeonSupport;
   ARM::FPURestriction Restriction;
 } FPUNames[] = {
-  { "invalid",       ARM::FK_INVALID,       0, ARM::NS_None,   ARM::FR_None},
-  { "none",          ARM::FK_NONE,          0, ARM::NS_None,   ARM::FR_None},
-  { "vfp",           ARM::FK_VFP,           2, ARM::NS_None,   ARM::FR_None},
-  { "vfpv2",         ARM::FK_VFPV2,         2, ARM::NS_None,   ARM::FR_None},
-  { "vfpv3",         ARM::FK_VFPV3,         3, ARM::NS_None,   ARM::FR_None},
-  { "vfpv3-d16",     ARM::FK_VFPV3_D16,     3, ARM::NS_None,   ARM::FR_D16},
-  { "vfpv4",         ARM::FK_VFPV4,         4, ARM::NS_None,   ARM::FR_None},
-  { "vfpv4-d16",     ARM::FK_VFPV4_D16,     4, ARM::NS_None,   ARM::FR_D16},
-  { "fpv4-sp-d16",   ARM::FK_FPV4_SP_D16,   4, ARM::NS_None,   ARM::FR_SP_D16},
-  { "fpv5-d16",      ARM::FK_FPV5_D16,      5, ARM::NS_None,   ARM::FR_D16},
-  { "fpv5-sp-d16",   ARM::FK_FPV5_SP_D16,   5, ARM::NS_None,   ARM::FR_SP_D16},
-  { "fp-armv8",      ARM::FK_FP_ARMV8,      5, ARM::NS_None,   ARM::FR_None},
-  { "neon",          ARM::FK_NEON,          3, ARM::NS_Neon,   ARM::FR_None},
-  { "neon-vfpv4",    ARM::FK_NEON_VFPV4,    4, ARM::NS_Neon,   ARM::FR_None},
-  { "neon-fp-armv8", ARM::FK_NEON_FP_ARMV8, 5, ARM::NS_Neon,   ARM::FR_None},
+  { "invalid",        ARM::FK_INVALID,        ARM::FV_NONE,       ARM::NS_None,   ARM::FR_None},
+  { "none",           ARM::FK_NONE,           ARM::FV_NONE,       ARM::NS_None,   ARM::FR_None},
+  { "vfp",            ARM::FK_VFP,            ARM::FV_VFPV2,      ARM::NS_None,   ARM::FR_None},
+  { "vfpv2",          ARM::FK_VFPV2,          ARM::FV_VFPV2,      ARM::NS_None,   ARM::FR_None},
+  { "vfpv3",          ARM::FK_VFPV3,          ARM::FV_VFPV3,      ARM::NS_None,   ARM::FR_None},
+  { "vfpv3-fp16",     ARM::FK_VFPV3_FP16,     ARM::FV_VFPV3_FP16, ARM::NS_None,   ARM::FR_None},
+  { "vfpv3-d16",      ARM::FK_VFPV3_D16,      ARM::FV_VFPV3,      ARM::NS_None,   ARM::FR_D16},
+  { "vfpv3-d16-fp16", ARM::FK_VFPV3_D16_FP16, ARM::FV_VFPV3_FP16, ARM::NS_None,   ARM::FR_D16},
+  { "vfpv3xd",        ARM::FK_VFPV3XD,        ARM::FV_VFPV3,      ARM::NS_None,   ARM::FR_SP_D16},
+  { "vfpv3xd-fp16",   ARM::FK_VFPV3XD_FP16,   ARM::FV_VFPV3_FP16, ARM::NS_None,   ARM::FR_SP_D16},
+  { "vfpv4",          ARM::FK_VFPV4,          ARM::FV_VFPV4,      ARM::NS_None,   ARM::FR_None},
+  { "vfpv4-d16",      ARM::FK_VFPV4_D16,      ARM::FV_VFPV4,      ARM::NS_None,   ARM::FR_D16},
+  { "fpv4-sp-d16",    ARM::FK_FPV4_SP_D16,    ARM::FV_VFPV4,      ARM::NS_None,   ARM::FR_SP_D16},
+  { "fpv5-d16",       ARM::FK_FPV5_D16,       ARM::FV_VFPV5,      ARM::NS_None,   ARM::FR_D16},
+  { "fpv5-sp-d16",    ARM::FK_FPV5_SP_D16,    ARM::FV_VFPV5,      ARM::NS_None,   ARM::FR_SP_D16},
+  { "fp-armv8",       ARM::FK_FP_ARMV8,       ARM::FV_VFPV5,      ARM::NS_None,   ARM::FR_None},
+  { "neon",           ARM::FK_NEON,           ARM::FV_VFPV3,      ARM::NS_Neon,   ARM::FR_None},
+  { "neon-fp16",      ARM::FK_NEON_FP16,      ARM::FV_VFPV3_FP16, ARM::NS_Neon,   ARM::FR_None},
+  { "neon-vfpv4",     ARM::FK_NEON_VFPV4,     ARM::FV_VFPV4,      ARM::NS_Neon,   ARM::FR_None},
+  { "neon-fp-armv8",  ARM::FK_NEON_FP_ARMV8,  ARM::FV_VFPV5,      ARM::NS_Neon,   ARM::FR_None},
   { "crypto-neon-fp-armv8",
-              ARM::FK_CRYPTO_NEON_FP_ARMV8, 5, ARM::NS_Crypto, ARM::FR_None},
-  { "softvfp",       ARM::FK_SOFTVFP,       0, ARM::NS_None,   ARM::FR_None},
+               ARM::FK_CRYPTO_NEON_FP_ARMV8,  ARM::FV_VFPV5,      ARM::NS_Crypto, ARM::FR_None},
+  { "softvfp",        ARM::FK_SOFTVFP,        ARM::FV_NONE,       ARM::NS_None,   ARM::FR_None},
 };
 
 // List of canonical arch names (use getArchSynonym).
@@ -279,27 +285,33 @@ bool ARMTargetParser::getFPUFeatures(unsigned FPUKind,
   // higher. We also have to make sure to disable fp16 when vfp4 is disabled,
   // as +vfp4 implies +fp16 but -vfp4 does not imply -fp16.
   switch (FPUNames[FPUKind].FPUVersion) {
-  case 5:
+  case ARM::FV_VFPV5:
     Features.push_back("+fp-armv8");
     break;
-  case 4:
+  case ARM::FV_VFPV4:
     Features.push_back("+vfp4");
     Features.push_back("-fp-armv8");
     break;
-  case 3:
+  case ARM::FV_VFPV3_FP16:
+    Features.push_back("+vfp3");
+    Features.push_back("+fp16");
+    Features.push_back("-vfp4");
+    Features.push_back("-fp-armv8");
+    break;
+  case ARM::FV_VFPV3:
     Features.push_back("+vfp3");
     Features.push_back("-fp16");
     Features.push_back("-vfp4");
     Features.push_back("-fp-armv8");
     break;
-  case 2:
+  case ARM::FV_VFPV2:
     Features.push_back("+vfp2");
     Features.push_back("-vfp3");
     Features.push_back("-fp16");
     Features.push_back("-vfp4");
     Features.push_back("-fp-armv8");
     break;
-  case 0:
+  case ARM::FV_NONE:
     Features.push_back("-vfp2");
     Features.push_back("-vfp3");
     Features.push_back("-fp16");
diff --git a/lib/Support/TimeValue.cpp b/lib/Support/TimeValue.cpp
index caa5b5a..136b93e 100644
--- a/lib/Support/TimeValue.cpp
+++ b/lib/Support/TimeValue.cpp
@@ -45,7 +45,7 @@ TimeValue::normalize( void ) {
   }
 }
 
-} // namespace llvm
+}
 
 /// Include the platform-specific portion of TimeValue class
 #ifdef LLVM_ON_UNIX
diff --git a/lib/Support/Timer.cpp b/lib/Support/Timer.cpp
index 0ad253b..d7b6515 100644
--- a/lib/Support/Timer.cpp
+++ b/lib/Support/Timer.cpp
@@ -50,7 +50,7 @@ namespace {
   InfoOutputFilename("info-output-file", cl::value_desc("filename"),
                      cl::desc("File to append -stats and -timer output to"),
                    cl::Hidden, cl::location(getLibSupportInfoOutputFilename()));
-} // namespace
+}
 
 // CreateInfoOutputFile - Return a file stream to print our output on.
 raw_ostream *llvm::CreateInfoOutputFile() {
@@ -218,7 +218,7 @@ public:
   }
 };
 
-} // namespace
+}
 
 static ManagedStatic<Name2TimerMap> NamedTimers;
 static ManagedStatic<Name2PairMap> NamedGroupedTimers;
diff --git a/lib/Support/Triple.cpp b/lib/Support/Triple.cpp
index 072d4a0..92be0e0 100644
--- a/lib/Support/Triple.cpp
+++ b/lib/Support/Triple.cpp
@@ -60,6 +60,8 @@ const char *Triple::getArchTypeName(ArchType Kind) {
   case spir64:      return "spir64";
   case kalimba:     return "kalimba";
   case shave:       return "shave";
+  case wasm32:      return "wasm32";
+  case wasm64:      return "wasm64";
   }
 
   llvm_unreachable("Invalid ArchType!");
@@ -122,6 +124,8 @@ const char *Triple::getArchTypePrefix(ArchType Kind) {
   case spir64:      return "spir";
   case kalimba:     return "kalimba";
   case shave:       return "shave";
+  case wasm32:      return "wasm32";
+  case wasm64:      return "wasm64";
   }
 }
 
@@ -255,6 +259,8 @@ Triple::ArchType Triple::getArchTypeForLLVMName(StringRef Name) {
     .Case("spir64", spir64)
     .Case("kalimba", kalimba)
     .Case("shave", shave)
+    .Case("wasm32", wasm32)
+    .Case("wasm64", wasm64)
     .Default(UnknownArch);
 }
 
@@ -360,6 +366,8 @@ static Triple::ArchType parseArch(StringRef ArchName) {
     .Case("spir64", Triple::spir64)
     .StartsWith("kalimba", Triple::kalimba)
     .Case("shave", Triple::shave)
+    .Case("wasm32", Triple::wasm32)
+    .Case("wasm64", Triple::wasm64)
     .Default(Triple::UnknownArch);
 }
 
@@ -1009,6 +1017,7 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::spir:
   case llvm::Triple::kalimba:
   case llvm::Triple::shave:
+  case llvm::Triple::wasm32:
     return 32;
 
   case llvm::Triple::aarch64:
@@ -1028,6 +1037,7 @@ static unsigned getArchPointerBitWidth(llvm::Triple::ArchType Arch) {
   case llvm::Triple::amdil64:
   case llvm::Triple::hsail64:
   case llvm::Triple::spir64:
+  case llvm::Triple::wasm64:
     return 64;
   }
   llvm_unreachable("Invalid architecture value");
@@ -1081,6 +1091,7 @@ Triple Triple::get32BitArchVariant() const {
   case Triple::x86:
   case Triple::xcore:
   case Triple::shave:
+  case Triple::wasm32:
     // Already 32-bit.
     break;
 
@@ -1094,6 +1105,7 @@ Triple Triple::get32BitArchVariant() const {
   case Triple::amdil64:   T.setArch(Triple::amdil);   break;
   case Triple::hsail64:   T.setArch(Triple::hsail);   break;
   case Triple::spir64:    T.setArch(Triple::spir);    break;
+  case Triple::wasm64:    T.setArch(Triple::wasm32);  break;
   }
   return T;
 }
@@ -1134,6 +1146,7 @@ Triple Triple::get64BitArchVariant() const {
   case Triple::sparcv9:
   case Triple::systemz:
   case Triple::x86_64:
+  case Triple::wasm64:
     // Already 64-bit.
     break;
 
@@ -1147,6 +1160,7 @@ Triple Triple::get64BitArchVariant() const {
   case Triple::amdil:   T.setArch(Triple::amdil64);   break;
   case Triple::hsail:   T.setArch(Triple::hsail64);   break;
   case Triple::spir:    T.setArch(Triple::spir64);    break;
+  case Triple::wasm32:  T.setArch(Triple::wasm64);    break;
   }
   return T;
 }
diff --git a/lib/Support/Unix/Process.inc b/lib/Support/Unix/Process.inc
index b15cedd..df13bd2 100644
--- a/lib/Support/Unix/Process.inc
+++ b/lib/Support/Unix/Process.inc
@@ -205,7 +205,7 @@ private:
   int &FD;
   bool KeepOpen;
 };
-} // namespace
+}
 
 std::error_code Process::FixupStandardFileDescriptors() {
   int NullFD = -1;
diff --git a/lib/Support/Unix/Program.inc b/lib/Support/Unix/Program.inc
index dc633ab..8947b62 100644
--- a/lib/Support/Unix/Program.inc
+++ b/lib/Support/Unix/Program.inc
@@ -176,7 +176,7 @@ static void SetMemoryLimits (unsigned size)
 #endif
 }
 
-} // namespace llvm
+}
 
 static bool Execute(ProcessInfo &PI, StringRef Program, const char **args,
                     const char **envp, const StringRef **redirects,
@@ -473,4 +473,4 @@ bool llvm::sys::argumentsFitWithinSystemLimits(ArrayRef<const char*> Args) {
   }
   return true;
 }
-} // namespace llvm
+}
diff --git a/lib/Support/Unix/ThreadLocal.inc b/lib/Support/Unix/ThreadLocal.inc
index a04dd3e..31c3f38 100644
--- a/lib/Support/Unix/ThreadLocal.inc
+++ b/lib/Support/Unix/ThreadLocal.inc
@@ -56,7 +56,7 @@ void ThreadLocalImpl::removeInstance() {
   setInstance(nullptr);
 }
 
-} // namespace llvm
+}
 #else
 namespace llvm {
 using namespace sys;
diff --git a/lib/Support/Unix/TimeValue.inc b/lib/Support/Unix/TimeValue.inc
index 2c4f04c..042e0da 100644
--- a/lib/Support/Unix/TimeValue.inc
+++ b/lib/Support/Unix/TimeValue.inc
@@ -51,4 +51,4 @@ TimeValue TimeValue::now() {
       NANOSECONDS_PER_MICROSECOND ) );
 }
 
-} // namespace llvm
+}
diff --git a/lib/Support/Unix/Watchdog.inc b/lib/Support/Unix/Watchdog.inc
index 9e335aa..5d89c0e 100644
--- a/lib/Support/Unix/Watchdog.inc
+++ b/lib/Support/Unix/Watchdog.inc
@@ -28,5 +28,5 @@ namespace llvm {
       alarm(0);
 #endif
     }
-  } // namespace sys
-} // namespace llvm
+  }
+}
diff --git a/lib/Support/Windows/DynamicLibrary.inc b/lib/Support/Windows/DynamicLibrary.inc
index 79d5f79..d38f197 100644
--- a/lib/Support/Windows/DynamicLibrary.inc
+++ b/lib/Support/Windows/DynamicLibrary.inc
@@ -23,14 +23,6 @@
  #include <ntverp.h>
 #endif
 
-#ifdef __MINGW32__
- #if (HAVE_LIBIMAGEHLP != 1)
-  #error "libimagehlp.a should be present"
- #endif
-#else
- #pragma comment(lib, "dbghelp.lib")
-#endif
-
 namespace llvm {
 using namespace sys;
 
@@ -39,10 +31,21 @@ using namespace sys;
 //===          and must not be UNIX code.
 //===----------------------------------------------------------------------===//
 
+typedef BOOL (WINAPI *fpEnumerateLoadedModules)(HANDLE,PENUMLOADED_MODULES_CALLBACK64,PVOID);
+static fpEnumerateLoadedModules fEnumerateLoadedModules;
 static DenseSet<HMODULE> *OpenedHandles;
 
+static bool loadDebugHelp(void) {
+  HMODULE hLib = ::LoadLibraryW(L"Dbghelp.dll");
+  if (hLib) {
+    fEnumerateLoadedModules = (fpEnumerateLoadedModules)
+      ::GetProcAddress(hLib, "EnumerateLoadedModules64");
+  }
+  return fEnumerateLoadedModules != 0;
+}
+
 static BOOL CALLBACK
-ELM_Callback(WIN32_ELMCB_PCSTR ModuleName, ULONG_PTR ModuleBase,
+ELM_Callback(WIN32_ELMCB_PCSTR ModuleName, DWORD64 ModuleBase,
              ULONG ModuleSize, PVOID UserContext) {
   OpenedHandles->insert((HMODULE)ModuleBase);
   return TRUE;
@@ -57,7 +60,14 @@ DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
     if (OpenedHandles == 0)
       OpenedHandles = new DenseSet<HMODULE>();
 
-    EnumerateLoadedModules(GetCurrentProcess(), ELM_Callback, 0);
+    if (!fEnumerateLoadedModules) {
+      if (!loadDebugHelp()) {
+        assert(false && "These APIs should always be available");
+        return DynamicLibrary();
+      }
+    }
+
+    fEnumerateLoadedModules(GetCurrentProcess(), ELM_Callback, 0);
     // Dummy library that represents "search all handles".
     // This is mostly to ensure that the return value still shows up as "valid".
     return DynamicLibrary(&OpenedHandles);
diff --git a/lib/Support/Windows/Signals.inc b/lib/Support/Windows/Signals.inc
index 6006499..5c8c239 100644
--- a/lib/Support/Windows/Signals.inc
+++ b/lib/Support/Windows/Signals.inc
@@ -31,10 +31,9 @@
 
 #ifdef _MSC_VER
  #pragma comment(lib, "psapi.lib")
- #pragma comment(lib, "dbghelp.lib")
 #elif __MINGW32__
- #if ((HAVE_LIBIMAGEHLP != 1) || (HAVE_LIBPSAPI != 1))
-  #error "libimagehlp.a & libpsapi.a should be present"
+ #if (HAVE_LIBPSAPI != 1)
+  #error "libpsapi.a should be present"
  #endif
  // The version of g++ that comes with MinGW does *not* properly understand
  // the ll format specifier for printf. However, MinGW passes the format
@@ -103,6 +102,8 @@
    DWORD64     Reserved[3];
    KDHELP64    KdHelp;
  } STACKFRAME64, *LPSTACKFRAME64;
+ #endif // !defined(__MINGW64_VERSION_MAJOR)
+#endif // __MINGW32__
 
 typedef BOOL (__stdcall *PREAD_PROCESS_MEMORY_ROUTINE64)(HANDLE hProcess,
                       DWORD64 qwBaseAddress, PVOID lpBuffer, DWORD nSize,
@@ -122,40 +123,46 @@ typedef BOOL (WINAPI *fpStackWalk64)(DWORD, HANDLE, HANDLE, LPSTACKFRAME64,
                       PFUNCTION_TABLE_ACCESS_ROUTINE64,
                       PGET_MODULE_BASE_ROUTINE64,
                       PTRANSLATE_ADDRESS_ROUTINE64);
-static fpStackWalk64 StackWalk64;
+static fpStackWalk64 fStackWalk64;
 
 typedef DWORD64 (WINAPI *fpSymGetModuleBase64)(HANDLE, DWORD64);
-static fpSymGetModuleBase64 SymGetModuleBase64;
+static fpSymGetModuleBase64 fSymGetModuleBase64;
 
 typedef BOOL (WINAPI *fpSymGetSymFromAddr64)(HANDLE, DWORD64,
                       PDWORD64, PIMAGEHLP_SYMBOL64);
-static fpSymGetSymFromAddr64 SymGetSymFromAddr64;
+static fpSymGetSymFromAddr64 fSymGetSymFromAddr64;
 
 typedef BOOL (WINAPI *fpSymGetLineFromAddr64)(HANDLE, DWORD64,
                       PDWORD, PIMAGEHLP_LINE64);
-static fpSymGetLineFromAddr64 SymGetLineFromAddr64;
+static fpSymGetLineFromAddr64 fSymGetLineFromAddr64;
 
 typedef PVOID (WINAPI *fpSymFunctionTableAccess64)(HANDLE, DWORD64);
-static fpSymFunctionTableAccess64 SymFunctionTableAccess64;
+static fpSymFunctionTableAccess64 fSymFunctionTableAccess64;
+
+typedef DWORD (WINAPI *fpSymSetOptions)(DWORD);
+static fpSymSetOptions fSymSetOptions;
+
+typedef BOOL (WINAPI *fpSymInitialize)(HANDLE, PCSTR, BOOL);
+static fpSymInitialize fSymInitialize;
 
 static bool load64BitDebugHelp(void) {
   HMODULE hLib = ::LoadLibraryW(L"Dbghelp.dll");
   if (hLib) {
-    StackWalk64 = (fpStackWalk64)
+    fStackWalk64 = (fpStackWalk64)
                       ::GetProcAddress(hLib, "StackWalk64");
-    SymGetModuleBase64 = (fpSymGetModuleBase64)
+    fSymGetModuleBase64 = (fpSymGetModuleBase64)
                       ::GetProcAddress(hLib, "SymGetModuleBase64");
-    SymGetSymFromAddr64 = (fpSymGetSymFromAddr64)
+    fSymGetSymFromAddr64 = (fpSymGetSymFromAddr64)
                       ::GetProcAddress(hLib, "SymGetSymFromAddr64");
-    SymGetLineFromAddr64 = (fpSymGetLineFromAddr64)
+    fSymGetLineFromAddr64 = (fpSymGetLineFromAddr64)
                       ::GetProcAddress(hLib, "SymGetLineFromAddr64");
-    SymFunctionTableAccess64 = (fpSymFunctionTableAccess64)
+    fSymFunctionTableAccess64 = (fpSymFunctionTableAccess64)
                      ::GetProcAddress(hLib, "SymFunctionTableAccess64");
+    fSymSetOptions = (fpSymSetOptions)::GetProcAddress(hLib, "SymSetOptions");
+    fSymInitialize = (fpSymInitialize)::GetProcAddress(hLib, "SymInitialize");
   }
-  return StackWalk64 != NULL;
+  return fStackWalk64 && fSymInitialize && fSymSetOptions;
 }
- #endif // !defined(__MINGW64_VERSION_MAJOR)
-#endif // __MINGW32__
 
 // Forward declare.
 static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep);
@@ -187,12 +194,12 @@ static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
 #endif
 
   // Initialize the symbol handler.
-  SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_LOAD_LINES);
-  SymInitialize(hProcess, NULL, TRUE);
+  fSymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_LOAD_LINES);
+  fSymInitialize(hProcess, NULL, TRUE);
 
   while (true) {
-    if (!StackWalk64(machineType, hProcess, hThread, &StackFrame, Context, NULL,
-                     SymFunctionTableAccess64, SymGetModuleBase64, NULL)) {
+    if (!fStackWalk64(machineType, hProcess, hThread, &StackFrame, Context, 0,
+                      fSymFunctionTableAccess64, fSymGetModuleBase64, 0)) {
       break;
     }
 
@@ -221,7 +228,7 @@ static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
             static_cast<DWORD>(StackFrame.Params[3]));
 #endif
     // Verify the PC belongs to a module in this process.
-    if (!SymGetModuleBase64(hProcess, PC)) {
+    if (!fSymGetModuleBase64(hProcess, PC)) {
       OS << " <unknown module>\n";
       continue;
     }
@@ -234,7 +241,7 @@ static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
     symbol->MaxNameLength = 512 - sizeof(IMAGEHLP_SYMBOL64);
 
     DWORD64 dwDisp;
-    if (!SymGetSymFromAddr64(hProcess, PC, &dwDisp, symbol)) {
+    if (!fSymGetSymFromAddr64(hProcess, PC, &dwDisp, symbol)) {
       OS << '\n';
       continue;
     }
@@ -250,7 +257,7 @@ static void PrintStackTraceForThread(llvm::raw_ostream &OS, HANDLE hProcess,
     IMAGEHLP_LINE64 line = {};
     DWORD dwLineDisp;
     line.SizeOfStruct = sizeof(line);
-    if (SymGetLineFromAddr64(hProcess, PC, &dwLineDisp, &line)) {
+    if (fSymGetLineFromAddr64(hProcess, PC, &dwLineDisp, &line)) {
       OS << format(", %s, line %lu", line.FileName, line.LineNumber);
       if (dwLineDisp > 0)
         OS << format(" + 0x%lX byte(s)", dwLineDisp);
@@ -301,17 +308,13 @@ static void InitializeThreading() {
 }
 
 static void RegisterHandler() {
-#if __MINGW32__ && !defined(__MINGW64_VERSION_MAJOR)
-  // On MinGW.org, we need to load up the symbols explicitly, because the
-  // Win32 framework they include does not have support for the 64-bit
-  // versions of the APIs we need.  If we cannot load up the APIs (which
-  // would be unexpected as they should exist on every version of Windows
-  // we support), we will bail out since there would be nothing to report.
+  // If we cannot load up the APIs (which would be unexpected as they should
+  // exist on every version of Windows we support), we will bail out since
+  // there would be nothing to report.
   if (!load64BitDebugHelp()) {
     assert(false && "These APIs should always be available");
     return;
   }
-#endif
 
   if (RegisteredUnhandledExceptionFilter) {
     EnterCriticalSection(&CriticalSection);
diff --git a/lib/Support/YAMLParser.cpp b/lib/Support/YAMLParser.cpp
index 5ca28a0..d55da5e 100644
--- a/lib/Support/YAMLParser.cpp
+++ b/lib/Support/YAMLParser.cpp
@@ -144,8 +144,8 @@ struct Token : ilist_node<Token> {
 
   Token() : Kind(TK_Error) {}
 };
-} // namespace yaml
-} // namespace llvm
+}
+}
 
 namespace llvm {
 template<>
@@ -178,7 +178,7 @@ struct ilist_node_traits<Token> {
 
   BumpPtrAllocator Alloc;
 };
-} // namespace llvm
+}
 
 typedef ilist<Token> TokenQueueT;
 
@@ -203,7 +203,7 @@ struct SimpleKey {
     return Tok == Other.Tok;
   }
 };
-} // namespace
+}
 
 /// @brief The Unicode scalar value of a UTF-8 minimal well-formed code unit
 ///        subsequence and the subsequence's length in code units (uint8_t).