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, 391 insertions, 0 deletions

diff --git a/contrib/libc++/src/experimental/filesystem/path.cpp b/contrib/libc++/src/experimental/filesystem/path.cpp
new file mode 100644
index 0000000..38c4498
--- /dev/null
+++ b/contrib/libc++/src/experimental/filesystem/path.cpp
@@ -0,0 +1,391 @@
+//===--------------------- filesystem/path.cpp ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "experimental/filesystem"
+#include "experimental/string_view"
+#include "utility"
+
+_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_FILESYSTEM
+
+_LIBCPP_CONSTEXPR path::value_type path::preferred_separator;
+
+namespace { namespace parser
+{
+
+using string_type = string_view;
+using value_type = path::value_type;
+
+using string_view_pair = pair<string_view, string_view>;
+
+// status reporting
+constexpr size_t npos = static_cast<size_t>(-1);
+
+inline bool good(size_t pos) { return pos != npos; }
+
+// lexical elements
+constexpr value_type preferred_separator = path::preferred_separator;
+constexpr value_type const * preferred_separator_str = "/";
+constexpr value_type const * dot = ".";
+
+// forward //
+bool is_separator(string_type const &, size_t);
+bool is_root_name(const string_type&, size_t);
+bool is_root_directory(string_type const &, size_t);
+bool is_trailing_separator(string_type const &, size_t);
+
+size_t start_of(string_type const &, size_t);
+size_t end_of(string_type const &, size_t);
+
+size_t root_name_start(const string_type& s);
+size_t root_name_end(const string_type&);
+
+size_t root_directory_start(string_type const &);
+size_t root_directory_end(string_type const &);
+
+string_view_pair separate_filename(string_type const &);
+string_view extract_raw(string_type const &, size_t);
+string_view extract_preferred(string_type const &, size_t);
+
+inline bool is_separator(const string_type& s, size_t pos) {
+    return (pos < s.size() && s[pos] == preferred_separator);
+}
+
+inline bool is_root_name(const string_type& s, size_t pos) {
+  return good(pos) && pos == 0 ? root_name_start(s) == pos : false;
+}
+
+inline bool is_root_directory(const string_type& s, size_t pos) {
+    return good(pos) ? root_directory_start(s) == pos : false;
+}
+
+inline bool is_trailing_separator(const string_type& s, size_t pos) {
+    return (pos < s.size() && is_separator(s, pos) &&
+            end_of(s, pos) == s.size()-1 &&
+            !is_root_directory(s, pos) && !is_root_name(s, pos));
+}
+
+size_t start_of(const string_type& s, size_t pos) {
+    if (pos >= s.size()) return npos;
+    bool in_sep = (s[pos] == preferred_separator);
+    while (pos - 1 < s.size() &&
+        (s[pos-1] == preferred_separator) == in_sep)
+    { --pos; }
+    if (pos == 2 && !in_sep && s[0] == preferred_separator &&
+        s[1] == preferred_separator)
+    { return 0; }
+    return pos;
+}
+
+size_t end_of(const string_type& s, size_t pos) {
+    if (pos >= s.size()) return npos;
+    // special case for root name
+    if (pos == 0 && is_root_name(s, pos)) return root_name_end(s);
+    bool in_sep = (s[pos] == preferred_separator);
+    while (pos + 1 < s.size() && (s[pos+1] == preferred_separator) == in_sep)
+    { ++pos; }
+    return pos;
+}
+
+inline size_t root_name_start(const string_type& s) {
+    return good(root_name_end(s)) ? 0 : npos;
+}
+
+size_t root_name_end(const string_type& s) {
+    if (s.size() < 2 || s[0] != preferred_separator
+        || s[1] != preferred_separator) {
+        return npos;
+    }
+    if (s.size() == 2) {
+        return 1;
+    }
+    size_t index = 2; // current position
+    if (s[index] == preferred_separator) {
+        return npos;
+    }
+    while (index + 1 < s.size() && s[index+1] != preferred_separator) {
+        ++index;
+    }
+    return index;
+}
+
+size_t root_directory_start(const string_type& s) {
+    size_t e = root_name_end(s);
+    if (!good(e))
+    return is_separator(s, 0) ? 0 : npos;
+    return is_separator(s, e + 1) ? e + 1 : npos;
+}
+
+size_t root_directory_end(const string_type& s) {
+    size_t st = root_directory_start(s);
+    if (!good(st)) return npos;
+    size_t index = st;
+    while (index + 1 < s.size() && s[index + 1] == preferred_separator)
+      { ++index; }
+    return index;
+}
+
+string_view_pair separate_filename(string_type const & s) {
+    if (s == "." || s == ".." || s.empty()) return string_view_pair{s, ""};
+    auto pos = s.find_last_of('.');
+    if (pos == string_type::npos) return string_view_pair{s, string_view{}};
+    return string_view_pair{s.substr(0, pos), s.substr(pos)};
+}
+
+inline string_view extract_raw(const string_type& s, size_t pos) {
+    size_t end_i = end_of(s, pos);
+    if (!good(end_i)) return string_view{};
+    return string_view(s).substr(pos, end_i - pos + 1);
+}
+
+string_view extract_preferred(const string_type& s, size_t pos) {
+    string_view raw = extract_raw(s, pos);
+    if (raw.empty())
+        return raw;
+    if (is_trailing_separator(s, pos))
+        return string_view{dot};
+    if (is_separator(s, pos) && !is_root_name(s, pos))
+        return string_view(preferred_separator_str);
+    return raw;
+}
+
+}} // namespace parser
+
+
+////////////////////////////////////////////////////////////////////////////////
+//                            path_view_iterator
+////////////////////////////////////////////////////////////////////////////////
+namespace {
+
+struct path_view_iterator {
+  const string_view __s_;
+  size_t __pos_;
+
+  explicit path_view_iterator(string_view const& __s) : __s_(__s), __pos_(__s_.empty() ? parser::npos : 0) {}
+  explicit path_view_iterator(string_view const& __s, size_t __p) : __s_(__s), __pos_(__p) {}
+
+  string_view operator*() const {
+    return parser::extract_preferred(__s_, __pos_);
+  }
+
+  path_view_iterator& operator++() {
+    increment();
+    return *this;
+  }
+
+  path_view_iterator& operator--() {
+    decrement();
+    return *this;
+  }
+
+  void increment() {
+    if (__pos_ == parser::npos) return;
+    while (! set_position(parser::end_of(__s_, __pos_)+1))
+        ;
+    return;
+  }
+
+  void decrement() {
+    if (__pos_ == 0) {
+      set_position(0);
+    }
+    else if (__pos_ == parser::npos) {
+      auto const str_size = __s_.size();
+      set_position(parser::start_of(
+          __s_, str_size != 0 ? str_size - 1 : str_size));
+    } else {
+      while (!set_position(parser::start_of(__s_, __pos_-1)))
+        ;
+    }
+  }
+
+  bool set_position(size_t pos) {
+    if (pos >= __s_.size()) {
+      __pos_ = parser::npos;
+    } else {
+      __pos_ = pos;
+    }
+    return valid_iterator_position();
+  }
+
+  bool valid_iterator_position() const {
+    if (__pos_ == parser::npos) return true; // end position is valid
+    return (!parser::is_separator      (__s_, __pos_) ||
+          parser::is_root_directory    (__s_, __pos_) ||
+          parser::is_trailing_separator(__s_, __pos_) ||
+          parser::is_root_name         (__s_, __pos_));
+  }
+
+  bool is_end() const { return __pos_ == parser::npos; }
+
+  inline bool operator==(path_view_iterator const& __p) {
+      return __pos_ == __p.__pos_;
+  }
+};
+
+path_view_iterator pbegin(path const& p) {
+    return path_view_iterator(p.native());
+}
+
+path_view_iterator pend(path const& p) {
+    path_view_iterator __p(p.native());
+    __p.__pos_ = parser::npos;
+    return __p;
+}
+
+} // end namespace
+///////////////////////////////////////////////////////////////////////////////
+//                            path definitions
+///////////////////////////////////////////////////////////////////////////////
+
+path & path::replace_extension(path const & replacement)
+{
+    path p = extension();
+    if (not p.empty()) {
+      __pn_.erase(__pn_.size() - p.native().size());
+    }
+    if (!replacement.empty()) {
+        if (replacement.native()[0] != '.') {
+            __pn_ += ".";
+        }
+        __pn_.append(replacement.__pn_);
+    }
+    return *this;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// path.decompose
+
+string_view path::__root_name() const
+{
+    return parser::is_root_name(__pn_, 0)
+      ? parser::extract_preferred(__pn_, 0)
+      : string_view{};
+}
+
+string_view path::__root_directory() const
+{
+    auto start_i = parser::root_directory_start(__pn_);
+    if(!parser::good(start_i)) {
+        return {};
+    }
+    return parser::extract_preferred(__pn_, start_i);
+}
+
+string_view path::__relative_path() const
+{
+    if (empty()) {
+        return {__pn_};
+    }
+    auto end_i = parser::root_directory_end(__pn_);
+    if (not parser::good(end_i)) {
+        end_i = parser::root_name_end(__pn_);
+    }
+    if (not parser::good(end_i)) {
+        return {__pn_};
+    }
+    return string_view(__pn_).substr(end_i+1);
+}
+
+string_view path::__parent_path() const
+{
+    if (empty() || pbegin(*this) == --pend(*this)) {
+        return {};
+    }
+    auto end_it = --(--pend(*this));
+    auto end_i = parser::end_of(__pn_, end_it.__pos_);
+    return string_view(__pn_).substr(0, end_i+1);
+}
+
+string_view path::__filename() const
+{
+    return empty() ? string_view{} : *--pend(*this);
+}
+
+string_view path::__stem() const
+{
+    return parser::separate_filename(__filename()).first;
+}
+
+string_view path::__extension() const
+{
+    return parser::separate_filename(__filename()).second;
+}
+
+////////////////////////////////////////////////////////////////////////////
+// path.comparisons
+int path::__compare(const value_type* __s) const {
+    path_view_iterator thisIter(this->native());
+    path_view_iterator sIter(__s);
+    while (!thisIter.is_end() && !sIter.is_end()) {
+        int res = (*thisIter).compare(*sIter);
+        if (res != 0) return res;
+        ++thisIter; ++sIter;
+    }
+    if (thisIter.is_end() && sIter.is_end())
+        return 0;
+    if (thisIter.is_end())
+        return -1;
+    return 1;
+}
+
+////////////////////////////////////////////////////////////////////////////
+// path.nonmembers
+size_t hash_value(const path& __p) _NOEXCEPT {
+  path_view_iterator thisIter(__p.native());
+  struct HashPairT {
+    size_t first;
+    size_t second;
+  };
+  HashPairT hp = {0, 0};
+  std::hash<string_view> hasher;
+  std::__scalar_hash<decltype(hp)> pair_hasher;
+  while (!thisIter.is_end()) {
+    hp.second = hasher(*thisIter);
+    hp.first = pair_hasher(hp);
+    ++thisIter;
+  }
+  return hp.first;
+}
+
+////////////////////////////////////////////////////////////////////////////
+// path.itr
+path::iterator path::begin() const
+{
+    path_view_iterator pit = pbegin(*this);
+    iterator it;
+    it.__path_ptr_ = this;
+    it.__pos_ = pit.__pos_;
+    it.__elem_.__assign_view(*pit);
+    return it;
+}
+
+path::iterator path::end() const
+{
+    iterator it{};
+    it.__path_ptr_ = this;
+    it.__pos_ = parser::npos;
+    return it;
+}
+
+path::iterator& path::iterator::__increment() {
+  path_view_iterator it(__path_ptr_->native(), __pos_);
+  it.increment();
+  __pos_ = it.__pos_;
+  __elem_.__assign_view(*it);
+  return *this;
+}
+
+path::iterator& path::iterator::__decrement() {
+  path_view_iterator it(__path_ptr_->native(), __pos_);
+  it.decrement();
+  __pos_ = it.__pos_;
+  __elem_.__assign_view(*it);
+  return *this;
+}
+
+_LIBCPP_END_NAMESPACE_EXPERIMENTAL_FILESYSTEM