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, 107 insertions, 34 deletions

diff --git a/contrib/llvm/tools/clang/lib/Driver/Job.cpp b/contrib/llvm/tools/clang/lib/Driver/Job.cpp
index 2d99b1f..9fd8808 100644
--- a/contrib/llvm/tools/clang/lib/Driver/Job.cpp
+++ b/contrib/llvm/tools/clang/lib/Driver/Job.cpp
@@ -7,18 +7,20 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/Driver/Job.h"
 #include "InputInfo.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/DriverDiagnostic.h"
-#include "clang/Driver/Job.h"
 #include "clang/Driver/Tool.h"
 #include "clang/Driver/ToolChain.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cassert>
@@ -37,50 +39,62 @@ Command::Command(const Action &Source, const Tool &Creator,
       InputFilenames.push_back(II.getFilename());
 }
 
-static int skipArgs(const char *Flag, bool HaveCrashVFS) {
+/// @brief Check if the compiler flag in question should be skipped when
+/// emitting a reproducer. Also track how many arguments it has and if the
+/// option is some kind of include path.
+static bool skipArgs(const char *Flag, bool HaveCrashVFS, int &SkipNum,
+                     bool &IsInclude) {
+  SkipNum = 2;
   // These flags are all of the form -Flag <Arg> and are treated as two
   // arguments.  Therefore, we need to skip the flag and the next argument.
-  bool Res = llvm::StringSwitch<bool>(Flag)
+  bool ShouldSkip = llvm::StringSwitch<bool>(Flag)
     .Cases("-MF", "-MT", "-MQ", "-serialize-diagnostic-file", true)
     .Cases("-o", "-coverage-file", "-dependency-file", true)
-    .Cases("-fdebug-compilation-dir", "-idirafter", true)
-    .Cases("-include", "-include-pch", "-internal-isystem", true)
-    .Cases("-internal-externc-isystem", "-iprefix", "-iwithprefix", true)
-    .Cases("-iwithprefixbefore", "-isystem", "-iquote", true)
+    .Cases("-fdebug-compilation-dir", "-diagnostic-log-file", true)
     .Cases("-dwarf-debug-flags", "-ivfsoverlay", true)
-    .Cases("-header-include-file", "-diagnostic-log-file", true)
-    // Some include flags shouldn't be skipped if we have a crash VFS
-    .Cases("-isysroot", "-I", "-F", "-resource-dir", !HaveCrashVFS)
     .Default(false);
-
-  // Match found.
-  if (Res)
-    return 2;
+  if (ShouldSkip)
+    return true;
+
+  // Some include flags shouldn't be skipped if we have a crash VFS
+  IsInclude = llvm::StringSwitch<bool>(Flag)
+    .Cases("-include", "-header-include-file", true)
+    .Cases("-idirafter", "-internal-isystem", "-iwithprefix", true)
+    .Cases("-internal-externc-isystem", "-iprefix", true)
+    .Cases("-iwithprefixbefore", "-isystem", "-iquote", true)
+    .Cases("-isysroot", "-I", "-F", "-resource-dir", true)
+    .Cases("-iframework", "-include-pch", true)
+    .Default(false);
+  if (IsInclude)
+    return HaveCrashVFS ? false : true;
 
   // The remaining flags are treated as a single argument.
 
   // These flags are all of the form -Flag and have no second argument.
-  Res = llvm::StringSwitch<bool>(Flag)
+  ShouldSkip = llvm::StringSwitch<bool>(Flag)
     .Cases("-M", "-MM", "-MG", "-MP", "-MD", true)
     .Case("-MMD", true)
     .Default(false);
 
   // Match found.
-  if (Res)
-    return 1;
+  SkipNum = 1;
+  if (ShouldSkip)
+    return true;
 
   // These flags are treated as a single argument (e.g., -F<Dir>).
   StringRef FlagRef(Flag);
-  if ((!HaveCrashVFS &&
-       (FlagRef.startswith("-F") || FlagRef.startswith("-I"))) ||
-      FlagRef.startswith("-fmodules-cache-path="))
-    return 1;
-
-  return 0;
+  IsInclude = FlagRef.startswith("-F") || FlagRef.startswith("-I");
+  if (IsInclude)
+    return HaveCrashVFS ? false : true;
+  if (FlagRef.startswith("-fmodules-cache-path="))
+    return true;
+
+  SkipNum = 0;
+  return false;
 }
 
-void Command::printArg(raw_ostream &OS, const char *Arg, bool Quote) {
-  const bool Escape = std::strpbrk(Arg, "\"\\$");
+void Command::printArg(raw_ostream &OS, StringRef Arg, bool Quote) {
+  const bool Escape = Arg.find_first_of("\"\\$") != StringRef::npos;
 
   if (!Quote && !Escape) {
     OS << Arg;
@@ -89,7 +103,7 @@ void Command::printArg(raw_ostream &OS, const char *Arg, bool Quote) {
 
   // Quote and escape. This isn't really complete, but good enough.
   OS << '"';
-  while (const char c = *Arg++) {
+  for (const char c : Arg) {
     if (c == '"' || c == '\\' || c == '$')
       OS << '\\';
     OS << c;
@@ -152,6 +166,45 @@ void Command::buildArgvForResponseFile(
   }
 }
 
+/// @brief Rewrite relative include-like flag paths to absolute ones.
+static void
+rewriteIncludes(const llvm::ArrayRef<const char *> &Args, size_t Idx,
+                size_t NumArgs,
+                llvm::SmallVectorImpl<llvm::SmallString<128>> &IncFlags) {
+  using namespace llvm;
+  using namespace sys;
+  auto getAbsPath = [](StringRef InInc, SmallVectorImpl<char> &OutInc) -> bool {
+    if (path::is_absolute(InInc)) // Nothing to do here...
+      return false;
+    std::error_code EC = fs::current_path(OutInc);
+    if (EC)
+      return false;
+    path::append(OutInc, InInc);
+    return true;
+  };
+
+  SmallString<128> NewInc;
+  if (NumArgs == 1) {
+    StringRef FlagRef(Args[Idx + NumArgs - 1]);
+    assert((FlagRef.startswith("-F") || FlagRef.startswith("-I")) &&
+            "Expecting -I or -F");
+    StringRef Inc = FlagRef.slice(2, StringRef::npos);
+    if (getAbsPath(Inc, NewInc)) {
+      SmallString<128> NewArg(FlagRef.slice(0, 2));
+      NewArg += NewInc;
+      IncFlags.push_back(std::move(NewArg));
+    }
+    return;
+  }
+
+  assert(NumArgs == 2 && "Not expecting more than two arguments");
+  StringRef Inc(Args[Idx + NumArgs - 1]);
+  if (!getAbsPath(Inc, NewInc))
+    return;
+  IncFlags.push_back(SmallString<128>(Args[Idx]));
+  IncFlags.push_back(std::move(NewInc));
+}
+
 void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
                     CrashReportInfo *CrashInfo) const {
   // Always quote the exe.
@@ -170,10 +223,27 @@ void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
     const char *const Arg = Args[i];
 
     if (CrashInfo) {
-      if (int Skip = skipArgs(Arg, HaveCrashVFS)) {
-        i += Skip - 1;
+      int NumArgs = 0;
+      bool IsInclude = false;
+      if (skipArgs(Arg, HaveCrashVFS, NumArgs, IsInclude)) {
+        i += NumArgs - 1;
         continue;
       }
+
+      // Relative includes need to be expanded to absolute paths.
+      if (HaveCrashVFS && IsInclude) {
+        SmallVector<SmallString<128>, 2> NewIncFlags;
+        rewriteIncludes(Args, i, NumArgs, NewIncFlags);
+        if (!NewIncFlags.empty()) {
+          for (auto &F : NewIncFlags) {
+            OS << ' ';
+            printArg(OS, F.c_str(), Quote);
+          }
+          i += NumArgs - 1;
+          continue;
+        }
+      }
+
       auto Found = std::find_if(InputFilenames.begin(), InputFilenames.end(),
                                 [&Arg](StringRef IF) { return IF == Arg; });
       if (Found != InputFilenames.end() &&
@@ -181,7 +251,7 @@ void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
         // Replace the input file name with the crashinfo's file name.
         OS << ' ';
         StringRef ShortName = llvm::sys::path::filename(CrashInfo->Filename);
-        printArg(OS, ShortName.str().c_str(), Quote);
+        printArg(OS, ShortName.str(), Quote);
         continue;
       }
     }
@@ -194,19 +264,22 @@ void Command::Print(raw_ostream &OS, const char *Terminator, bool Quote,
     OS << ' ';
     printArg(OS, "-ivfsoverlay", Quote);
     OS << ' ';
-    printArg(OS, CrashInfo->VFSPath.str().c_str(), Quote);
+    printArg(OS, CrashInfo->VFSPath.str(), Quote);
 
-    // Insert -fmodules-cache-path and use the relative module directory
-    // <name>.cache/vfs/modules where we already dumped the modules.
+    // The leftover modules from the crash are stored in
+    //  <name>.cache/vfs/modules
+    // Leave it untouched for pcm inspection and provide a clean/empty dir
+    // path to contain the future generated module cache:
+    //  <name>.cache/vfs/repro-modules
     SmallString<128> RelModCacheDir = llvm::sys::path::parent_path(
         llvm::sys::path::parent_path(CrashInfo->VFSPath));
-    llvm::sys::path::append(RelModCacheDir, "modules");
+    llvm::sys::path::append(RelModCacheDir, "repro-modules");
 
     std::string ModCachePath = "-fmodules-cache-path=";
     ModCachePath.append(RelModCacheDir.c_str());
 
     OS << ' ';
-    printArg(OS, ModCachePath.c_str(), Quote);
+    printArg(OS, ModCachePath, Quote);
   }
 
   if (ResponseFile != nullptr) {