Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release:

MFC r309142 (by emaste):

Add WITH_LLD_AS_LD build knob

If set it installs LLD as /usr/bin/ld.  LLD (as of version 3.9) is not
capable of linking the world and kernel, but can self-host and link many
substantial applications. GNU ld continues to be used for the world and
kernel build, regardless of how this knob is set.

It is on by default for arm64, and off for all other CPU architectures.

Sponsored by:	The FreeBSD Foundation

MFC r310840:

Reapply 310775, now it also builds correctly if lldb is disabled:

Move llvm-objdump from CLANG_EXTRAS to installed by default

We currently install three tools from binutils 2.17.50: as, ld, and
objdump. Work is underway to migrate to a permissively-licensed
tool-chain, with one goal being the retirement of binutils 2.17.50.

LLVM's llvm-objdump is intended to be compatible with GNU objdump
although it is currently missing some options and may have formatting
differences. Enable it by default for testing and further investigation.
It may later be changed to install as /usr/bin/objdump, it becomes a
fully viable replacement.

Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D8879

MFC r312855 (by emaste):

Rename LLD_AS_LD to LLD_IS_LD, for consistency with CLANG_IS_CC

Reported by:	Dan McGregor <dan.mcgregor usask.ca>

MFC r313559 | glebius | 2017-02-10 18:34:48 +0100 (Fri, 10 Feb 2017) | 5 lines

Don't check struct rtentry on FreeBSD, it is an internal kernel structure.
On other systems it may be API structure for SIOCADDRT/SIOCDELRT.

Reviewed by:	emaste, dim

MFC r314152 (by jkim):

Remove an assembler flag, which is redundant since r309124.  The upstream
took care of it by introducing a macro NO_EXEC_STACK_DIRECTIVE.

http://llvm.org/viewvc/llvm-project?rev=273500&view=rev

Reviewed by:	dim

MFC r314564:

Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
4.0.0 (branches/release_40 296509).  The release will follow soon.

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

Also note that as of 4.0.0, lld should be able to link the base system
on amd64 and aarch64.  See the WITH_LLD_IS_LLD setting in src.conf(5).
Though please be aware that this is work in progress.

Release notes for llvm, clang and lld will be available here:
<http://releases.llvm.org/4.0.0/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/clang/docs/ReleaseNotes.html>
<http://releases.llvm.org/4.0.0/tools/lld/docs/ReleaseNotes.html>

Thanks to Ed Maste, Jan Beich, Antoine Brodin and Eric Fiselier for
their help.

Relnotes:	yes
Exp-run:	antoine
PR:		215969, 216008

MFC r314708:

For now, revert r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

This commit is the cause of excessive compile times on skein_block.c
(and possibly other files) during kernel builds on amd64.

We never saw the problematic behavior described in this upstream commit,
so for now it is better to revert it.  An upstream bug has been filed
here: https://bugs.llvm.org/show_bug.cgi?id=32142

Reported by:	mjg

MFC r314795:

Reapply r287232 from upstream llvm trunk (by Daniil Fukalov):

  [SCEV] limit recursion depth of CompareSCEVComplexity

  Summary:
  CompareSCEVComplexity goes too deep (50+ on a quite a big unrolled
  loop) and runs almost infinite time.

  Added cache of "equal" SCEV pairs to earlier cutoff of further
  estimation. Recursion depth limit was also introduced as a parameter.

  Reviewers: sanjoy

  Subscribers: mzolotukhin, tstellarAMD, llvm-commits

  Differential Revision: https://reviews.llvm.org/D26389

Pull in r296992 from upstream llvm trunk (by Sanjoy Das):

  [SCEV] Decrease the recursion threshold for CompareValueComplexity

  Fixes PR32142.

  r287232 accidentally increased the recursion threshold for
  CompareValueComplexity from 2 to 32.  This change reverses that
  change by introducing a separate flag for CompareValueComplexity's
  threshold.

The latter revision fixes the excessive compile times for skein_block.c.

MFC r314907 | mmel | 2017-03-08 12:40:27 +0100 (Wed, 08 Mar 2017) | 7 lines

Unbreak ARMv6 world.

The new compiler_rt library imported with clang 4.0.0 have several fatal
issues (non-functional __udivsi3 for example) with ARM specific instrict
functions. As temporary workaround, until upstream solve these problems,
disable all thumb[1][2] related feature.

MFC r315016:

Update clang, llvm, lld, lldb, compiler-rt and libc++ to 4.0.0 release.
We were already very close to the last release candidate, so this is a
pretty minor update.

Relnotes:	yes

MFC r316005:

Revert r314907, and pull in r298713 from upstream compiler-rt trunk (by
Weiming Zhao):

  builtins: Select correct code fragments when compiling for Thumb1/Thum2/ARM ISA.

  Summary:
  Value of __ARM_ARCH_ISA_THUMB isn't based on the actual compilation
  mode (-mthumb, -marm), it reflect's capability of given CPU.

  Due to this:
   - use  __tbumb__ and __thumb2__ insteand of __ARM_ARCH_ISA_THUMB
   - use '.thumb' directive consistently  in all affected files
   - decorate all thumb functions using
     DEFINE_COMPILERRT_THUMB_FUNCTION()

  ---------
  Note: This patch doesn't fix broken Thumb1 variant of __udivsi3 !

  Reviewers: weimingz, rengolin, compnerd

  Subscribers: aemerson, dim

  Differential Revision: https://reviews.llvm.org/D30938

Discussed with:	mmel

1 files changed, 127 insertions, 159 deletions

diff --git a/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.h b/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.h
index 888e2a9..cd38989 100644
--- a/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.h
+++ b/contrib/llvm/tools/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.h
@@ -1,4 +1,5 @@
-//===-- ProcessFreeBSD.h ------------------------------------------*- C++ -*-===//
+//===-- ProcessFreeBSD.h ------------------------------------------*- C++
+//-*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -18,233 +19,200 @@
 #include <set>
 
 // Other libraries and framework includes
+#include "ProcessFreeBSD.h"
+#include "ProcessMessage.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/ThreadList.h"
-#include "ProcessMessage.h"
-#include "ProcessFreeBSD.h"
 
 class ProcessMonitor;
 class FreeBSDThread;
 
-class ProcessFreeBSD :
-    public lldb_private::Process
-{
+class ProcessFreeBSD : public lldb_private::Process {
 
 public:
-    //------------------------------------------------------------------
-    // Static functions.
-    //------------------------------------------------------------------
-    static lldb::ProcessSP
-    CreateInstance(lldb::TargetSP target_sp,
-                   lldb::ListenerSP listener_sp,
-                   const lldb_private::FileSpec *crash_file_path);
+  //------------------------------------------------------------------
+  // Static functions.
+  //------------------------------------------------------------------
+  static lldb::ProcessSP
+  CreateInstance(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
+                 const lldb_private::FileSpec *crash_file_path);
 
-    static void
-    Initialize();
+  static void Initialize();
 
-    static void
-    Terminate();
+  static void Terminate();
 
-    static lldb_private::ConstString
-    GetPluginNameStatic();
+  static lldb_private::ConstString GetPluginNameStatic();
 
-    static const char *
-    GetPluginDescriptionStatic();
+  static const char *GetPluginDescriptionStatic();
 
-    //------------------------------------------------------------------
-    // Constructors and destructors
-    //------------------------------------------------------------------
-    ProcessFreeBSD(lldb::TargetSP target_sp,
-                   lldb::ListenerSP listener_sp,
-                   lldb::UnixSignalsSP &unix_signals_sp);
+  //------------------------------------------------------------------
+  // Constructors and destructors
+  //------------------------------------------------------------------
+  ProcessFreeBSD(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
+                 lldb::UnixSignalsSP &unix_signals_sp);
 
-    ~ProcessFreeBSD();
+  ~ProcessFreeBSD();
 
-    virtual lldb_private::Error
-    WillResume() override;
+  virtual lldb_private::Error WillResume() override;
 
-    //------------------------------------------------------------------
-    // PluginInterface protocol
-    //------------------------------------------------------------------
-    virtual lldb_private::ConstString
-    GetPluginName() override;
+  //------------------------------------------------------------------
+  // PluginInterface protocol
+  //------------------------------------------------------------------
+  virtual lldb_private::ConstString GetPluginName() override;
 
-    virtual uint32_t
-    GetPluginVersion() override;
+  virtual uint32_t GetPluginVersion() override;
 
 public:
-    //------------------------------------------------------------------
-    // Process protocol.
-    //------------------------------------------------------------------
-    void
-    Finalize() override;
+  //------------------------------------------------------------------
+  // Process protocol.
+  //------------------------------------------------------------------
+  void Finalize() override;
 
-    bool
-    CanDebug(lldb::TargetSP target_sp, bool plugin_specified_by_name) override;
+  bool CanDebug(lldb::TargetSP target_sp,
+                bool plugin_specified_by_name) override;
 
-    lldb_private::Error
-    WillLaunch(lldb_private::Module *module) override;
+  lldb_private::Error WillLaunch(lldb_private::Module *module) override;
 
-    lldb_private::Error
-    DoAttachToProcessWithID (lldb::pid_t pid, const lldb_private::ProcessAttachInfo &attach_info) override;
+  lldb_private::Error DoAttachToProcessWithID(
+      lldb::pid_t pid,
+      const lldb_private::ProcessAttachInfo &attach_info) override;
 
-    lldb_private::Error
-    DoLaunch (lldb_private::Module *exe_module,
-              lldb_private::ProcessLaunchInfo &launch_info) override;
+  lldb_private::Error
+  DoLaunch(lldb_private::Module *exe_module,
+           lldb_private::ProcessLaunchInfo &launch_info) override;
 
-    void
-    DidLaunch() override;
+  void DidLaunch() override;
 
-    lldb_private::Error
-    DoResume() override;
+  lldb_private::Error DoResume() override;
 
-    lldb_private::Error
-    DoHalt(bool &caused_stop) override;
+  lldb_private::Error DoHalt(bool &caused_stop) override;
 
-    lldb_private::Error
-    DoDetach(bool keep_stopped) override;
+  lldb_private::Error DoDetach(bool keep_stopped) override;
 
-    lldb_private::Error
-    DoSignal(int signal) override;
+  lldb_private::Error DoSignal(int signal) override;
 
-    lldb_private::Error
-    DoDestroy() override;
+  lldb_private::Error DoDestroy() override;
 
-    void
-    DoDidExec() override;
+  void DoDidExec() override;
 
-    void
-    RefreshStateAfterStop() override;
+  void RefreshStateAfterStop() override;
 
-    bool
-    IsAlive() override;
+  bool IsAlive() override;
 
-    size_t
-    DoReadMemory(lldb::addr_t vm_addr,
-                 void *buf,
-                 size_t size,
-                 lldb_private::Error &error) override;
+  size_t DoReadMemory(lldb::addr_t vm_addr, void *buf, size_t size,
+                      lldb_private::Error &error) override;
 
-    size_t
-    DoWriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,
-                  lldb_private::Error &error) override;
+  size_t DoWriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size,
+                       lldb_private::Error &error) override;
 
-    lldb::addr_t
-    DoAllocateMemory(size_t size, uint32_t permissions,
-                     lldb_private::Error &error) override;
+  lldb::addr_t DoAllocateMemory(size_t size, uint32_t permissions,
+                                lldb_private::Error &error) override;
 
-    lldb_private::Error
-    DoDeallocateMemory(lldb::addr_t ptr) override;
+  lldb_private::Error DoDeallocateMemory(lldb::addr_t ptr) override;
 
-    virtual size_t
-    GetSoftwareBreakpointTrapOpcode(lldb_private::BreakpointSite* bp_site);
+  virtual size_t
+  GetSoftwareBreakpointTrapOpcode(lldb_private::BreakpointSite *bp_site);
 
-    lldb_private::Error
-    EnableBreakpointSite(lldb_private::BreakpointSite *bp_site) override;
+  lldb_private::Error
+  EnableBreakpointSite(lldb_private::BreakpointSite *bp_site) override;
 
-    lldb_private::Error
-    DisableBreakpointSite(lldb_private::BreakpointSite *bp_site) override;
+  lldb_private::Error
+  DisableBreakpointSite(lldb_private::BreakpointSite *bp_site) override;
 
-    lldb_private::Error
-    EnableWatchpoint(lldb_private::Watchpoint *wp, bool notify = true) override;
+  lldb_private::Error EnableWatchpoint(lldb_private::Watchpoint *wp,
+                                       bool notify = true) override;
 
-    lldb_private::Error
-    DisableWatchpoint(lldb_private::Watchpoint *wp, bool notify = true) override;
+  lldb_private::Error DisableWatchpoint(lldb_private::Watchpoint *wp,
+                                        bool notify = true) override;
 
-    lldb_private::Error
-    GetWatchpointSupportInfo(uint32_t &num) override;
+  lldb_private::Error GetWatchpointSupportInfo(uint32_t &num) override;
 
-    lldb_private::Error
-    GetWatchpointSupportInfo(uint32_t &num, bool &after) override;
+  lldb_private::Error GetWatchpointSupportInfo(uint32_t &num,
+                                               bool &after) override;
 
-    virtual uint32_t
-    UpdateThreadListIfNeeded();
+  virtual uint32_t UpdateThreadListIfNeeded();
 
-    bool
-    UpdateThreadList(lldb_private::ThreadList &old_thread_list,
-                     lldb_private::ThreadList &new_thread_list) override;
+  bool UpdateThreadList(lldb_private::ThreadList &old_thread_list,
+                        lldb_private::ThreadList &new_thread_list) override;
 
-    virtual lldb::ByteOrder
-    GetByteOrder() const;
+  virtual lldb::ByteOrder GetByteOrder() const;
 
-    lldb::addr_t
-    GetImageInfoAddress() override;
+  lldb::addr_t GetImageInfoAddress() override;
 
-    size_t
-    PutSTDIN(const char *buf, size_t len, lldb_private::Error &error) override;
+  size_t PutSTDIN(const char *buf, size_t len,
+                  lldb_private::Error &error) override;
 
-    const lldb::DataBufferSP
-    GetAuxvData () override;
+  const lldb::DataBufferSP GetAuxvData() override;
 
-    //--------------------------------------------------------------------------
-    // ProcessFreeBSD internal API.
+  //--------------------------------------------------------------------------
+  // ProcessFreeBSD internal API.
 
-    /// Registers the given message with this process.
-    virtual void
-    SendMessage(const ProcessMessage &message);
+  /// Registers the given message with this process.
+  virtual void SendMessage(const ProcessMessage &message);
 
-    ProcessMonitor &
-    GetMonitor() { assert(m_monitor); return *m_monitor; }
+  ProcessMonitor &GetMonitor() {
+    assert(m_monitor);
+    return *m_monitor;
+  }
 
-    lldb_private::FileSpec
-    GetFileSpec(const lldb_private::FileAction *file_action,
-                const lldb_private::FileSpec &default_file_spec,
-                const lldb_private::FileSpec &dbg_pts_file_spec);
+  lldb_private::FileSpec
+  GetFileSpec(const lldb_private::FileAction *file_action,
+              const lldb_private::FileSpec &default_file_spec,
+              const lldb_private::FileSpec &dbg_pts_file_spec);
 
-    /// Adds the thread to the list of threads for which we have received the initial stopping signal.
-    /// The \p stop_tid parameter indicates the thread which the stop happened for.
-    bool
-    AddThreadForInitialStopIfNeeded(lldb::tid_t stop_tid);
+  /// Adds the thread to the list of threads for which we have received the
+  /// initial stopping signal.
+  /// The \p stop_tid parameter indicates the thread which the stop happened
+  /// for.
+  bool AddThreadForInitialStopIfNeeded(lldb::tid_t stop_tid);
 
-    bool
-    WaitingForInitialStop(lldb::tid_t stop_tid);
+  bool WaitingForInitialStop(lldb::tid_t stop_tid);
 
-    virtual FreeBSDThread *
-    CreateNewFreeBSDThread(lldb_private::Process &process, lldb::tid_t tid);
+  virtual FreeBSDThread *CreateNewFreeBSDThread(lldb_private::Process &process,
+                                                lldb::tid_t tid);
 
 protected:
-    /// Target byte order.
-    lldb::ByteOrder m_byte_order;
-
-    /// Process monitor;
-    ProcessMonitor *m_monitor;
+  /// Target byte order.
+  lldb::ByteOrder m_byte_order;
 
-    /// The module we are executing.
-    lldb_private::Module *m_module;
+  /// Process monitor;
+  ProcessMonitor *m_monitor;
 
-    /// Message queue notifying this instance of inferior process state changes.
-    std::recursive_mutex m_message_mutex;
-    std::queue<ProcessMessage> m_message_queue;
+  /// The module we are executing.
+  lldb_private::Module *m_module;
 
-    /// Drive any exit events to completion.
-    bool m_exit_now;
+  /// Message queue notifying this instance of inferior process state changes.
+  std::recursive_mutex m_message_mutex;
+  std::queue<ProcessMessage> m_message_queue;
 
-    /// Returns true if the process has exited.
-    bool HasExited();
+  /// Drive any exit events to completion.
+  bool m_exit_now;
 
-    /// Returns true if the process is stopped.
-    bool IsStopped();
+  /// Returns true if the process has exited.
+  bool HasExited();
 
-    /// Returns true if at least one running is currently running
-    bool IsAThreadRunning();
+  /// Returns true if the process is stopped.
+  bool IsStopped();
 
-    typedef std::map<lldb::addr_t, lldb::addr_t> MMapMap;
-    MMapMap m_addr_to_mmap_size;
+  /// Returns true if at least one running is currently running
+  bool IsAThreadRunning();
 
-    typedef std::set<lldb::tid_t> ThreadStopSet;
-    /// Every thread begins with a stop signal. This keeps track
-    /// of the threads for which we have received the stop signal.
-    ThreadStopSet m_seen_initial_stop;
+  typedef std::map<lldb::addr_t, lldb::addr_t> MMapMap;
+  MMapMap m_addr_to_mmap_size;
 
-    friend class FreeBSDThread;
+  typedef std::set<lldb::tid_t> ThreadStopSet;
+  /// Every thread begins with a stop signal. This keeps track
+  /// of the threads for which we have received the stop signal.
+  ThreadStopSet m_seen_initial_stop;
 
-    typedef std::vector<lldb::tid_t> tid_collection;
-    tid_collection m_suspend_tids;
-    tid_collection m_run_tids;
-    tid_collection m_step_tids;
+  friend class FreeBSDThread;
 
-    int m_resume_signo;
+  typedef std::vector<lldb::tid_t> tid_collection;
+  tid_collection m_suspend_tids;
+  tid_collection m_run_tids;
+  tid_collection m_step_tids;
 
+  int m_resume_signo;
 };
 
-#endif  // liblldb_ProcessFreeBSD_H_
+#endif // liblldb_ProcessFreeBSD_H_