Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

(NOTE: This does not yet consolidate all the llvm project sources under
contrib/llvm-project (e.g., MFC r355940), due to Subversion limitations.
It will be done in a follow-up MFC.)

MFC r348610 (by emaste):

build llvm-ar and llvm-nm with Clang (promote out of CLANG_EXTRAS)

To facilitate experimentation with LTO we require an ar that supports
LLVM IR, and to a lesser degree also an nm.  As a first step always
install llvm-ar and llvm-nm.

Sponsored by:	The FreeBSD Foundation

MFC r350467 (by luporl):

[PPC64] Backport fix for missing IRELATIVE relocations

This is a backport of LLVM commit 8331f61a51a7a0a1efbf5ed398e181593023d151,
llvm-svn: 353981:

ELF: Allow GOT relocs pointing to non-preemptable ifunc to resolve to an
IRELATIVE where possible.

This is needed in order to make ifuncs work correctly on PPC64.

It fixes an issue with lld, in which it would skip emitting necessary IRELATIVE
relocations.  Without this change, indirect calls to ifuncs would result in a
segmentation fault, in static binaries or when defined in the main binary
(outside shared libraries).

This change also reverts the local
"Preserve relocations against ifuncs when -zifunc-noplt" commit and
replaces it by its upstream version, as part of the merge.

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D21102

MFC r351662 (by emaste):

lldb: shorten thread names to make logs easier to follow

lldb prepends the thread name to log entries, and the existing thread
name for the FreeBSD ProcessMonitor thread was longer than the kernel's
supported thread name length, and so was truncated.  This made logs hard
to read, as the truncated thread name ran into the log message.  Shorten
"lldb.process.freebsd.operation" to just "freebsd.op" so that logs are
more readable.

(Upstreaming to lldb still to be done).

MFC r352095 (by emaste):

compiler-rt: use more __sanitizer_time_t on FreeBSD

A few structs were using long for time_t members.

Obtained from:	LLVM r370755

MFC r352096 (by emaste):

compiler-rt: use 64-bit time_t for all FreeBSD archs except i386

Obtained from:	LLVM r370756

MFC r352167 (by imp):

Remove dir empty since r276851

MFC r352168 (by imp):

Remove dirs empty since r280031

MFC r352169 (by imp):

Remove dir empty since r314564

MFC r352170 (by imp):

Remove dir empty since r327952

MFC r352171 (by imp):

Remove dirs (and their now-empty parents) empty since r344779

MFC r352792 (by emaste):

compiler-rt: correct RISC-V struct_kernel_stat64_sz

The value of struct_kernel_stat64_sz introduced by review D5021 for
RISC-V was incorrect.

Also add a __riscv_xlen == 64 conditional as the 32-bit ABI is not yet
finalized.

Submitted by:	Luís Marques
Differential Revision:	https://reviews.freebsd.org/D21684

MFC r353018 (by kevans):

clang: use -mxgot for 32-bit mips

Various bits in usr.bin/clang/* will fail to compile without -mxgot due to
truncated relocations. -mxgot entails a speed penalty, but I suspect we
don't care as much about compiler performance in 32-bit mips land.

Reviewed by:	arichardson
Differential Revision:	https://reviews.freebsd.org/D21698

MFC r353358:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
9.0.0 final release r372316.

Release notes for llvm, clang, lld and libc++ 9.0.0 are available here:

https://releases.llvm.org/9.0.0/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/clang/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/tools/lld/docs/ReleaseNotes.html
https://releases.llvm.org/9.0.0/projects/libcxx/docs/ReleaseNotes.html

PR:		240629

MFC r353363:

Put in a band-aid fix for lldb 9 exiting with "Expected<T> must be
checked before access or destruction" when launching executables, while
we sort this out with upstream.

Reported by:	jbeich
PR:		241137

MFC r353415:

Revert r353363 in preparation for applying upstream fix:

Put in a band-aid fix for lldb 9 exiting with "Expected<T> must be
checked before access or destruction" when launching executables, while
we sort this out with upstream.

PR:		241137

MFC r353416:

Pull in r374444 from upstream lldb trunk (by me):

  Fix process launch failure on FreeBSD after r365761

  Summary:
  After rLLDB365761, and with `LLVM_ENABLE_ABI_BREAKING_CHECKS`
  enabled, launching any process on FreeBSD crashes lldb with:

  ```
  Expected<T> must be checked before access or destruction.
  Expected<T> value was in success state. (Note: Expected<T> values in
  success mode must still be checked prior to being destroyed).
  ```

  This is because `m_operation_thread` and `m_monitor_thread` were
  wrapped in `llvm::Expected<>`, but this requires the objects to be
  correctly initialized before accessing them.

  To fix the crashes, use `llvm::Optional<>` for the members (as
  indicated by labath), and use local variables to store the return
  values of `LaunchThread` and `StartMonitoringChildProcess`.  Then,
  only assign to the member variables after checking if the return
  values indicated success.

  Reviewers: devnexen, emaste, MaskRay, mgorny

  Reviewed By: devnexen

  Subscribers: jfb, labath, krytarowski, lldb-commits

  Differential Revision: https://reviews.llvm.org/D68723

PR:		241137

MFC r353579 (by jhb):

Use __FreeBSD_version to determine if gets() has been removed.

GCC compilers set __FreeBSD__ statically to a build-time determined
targeted version (which in ports always matches the build host's
version).  This means that when building any version (12 or 13, etc.)
of riscv or some other architecture via GCC on a 12.x host,
__FreeBSD__ will always be set to 12.  As a result, __FreeBSD__ cannot
be used to reliably detect the target FreeBSD version being built.
Instead, __FreeBSD_version from either <sys/param.h> (in the kernel)
or <osreldate.h> (in userland) should be used.

This changes the gets() test in libc++ to use __FreeBSD_version from
<osreldate.h>.

Reported by:	jenkins (riscv64 and amd64-gcc)
Reviewed by:	dim, imp
Differential Revision:	https://reviews.freebsd.org/D22034

MFC r353711 (by mhorne):

Fix build of LLVM RISC-V backend

Reviewed by:	dim
MFC with:	r353358
Differential Revision:	https://reviews.freebsd.org/D21963

MFC r353738:

Pull in r372651 from upstream lld trunk (by Simon Atanasyan):

  [mips] Support elf32btsmipn32_fbsd / elf32ltsmipn32_fbsd emulations

  Patch by Kyle Evans.

Requested by:	kevans

MFC r353739:

Pull in r374154 from upstream clang trunk (by Simon Atanasyan):

  [mips] Set default float ABI to "soft" on FreeBSD

  Initial patch by Kyle Evans.

  Fix PR43596

Requested by:	kevans

MFC r353936:

Bump clang's default target CPU for the i386 architecture (aka "x86") to
i686, as per the discussion on the freebsd-arch mailing list.  Earlier
in r352030, I had already bumped it to i586, to work around missing
atomic 64 bit functions for the i386 architecture.

Relnotes:	yes

MFC r354097:

Pull in r372186 from upstream llvm trunk (by Eli Friedman):

  [ARM] VFPv2 only supports 16 D registers.

  r361845 changed the way we handle "D16" vs. "D32" targets; there used
  to be a negative "d16" which removed instructions from the
  instruction set, and now there's a "d32" feature which adds
  instructions to the instruction set.  This is good, but there was an
  oversight in the implementation: the behavior of VFPv2 was changed.
  In particular, the "vfp2" feature was changed to imply "d32". This is
  wrong: VFPv2 only supports 16 D registers.

  In practice, this means if you specify -mfpu=vfpv2, the compiler will
  generate illegal instructions.

  This patch gets rid of "vfp2d16" and "vfp2d16sp", and fixes "vfp2"
  and "vfp2sp" so they don't imply "d32".

  Differential Revision: https://reviews.llvm.org/D67375

Pull in r372187 from upstream clang trunk (by Eli Friedman):

  [ARM] Update clang for removal of vfp2d16 and vfp2d16sp

  Matching fix for https://reviews.llvm.org/D67375 (r372186).

  Differential Revision: https://reviews.llvm.org/D67467

This should fix clang generating invalid opcodes for floating point
operations on armv6.

Requested by:	mmel

MFC r354146:

Pull in r373338 from upstream llvm trunk (by Simon Pilgrim):

  Revert rL349624 : Let TableGen write output only if it changed,
  instead of doing so in cmake, attempt 2

  Differential Revision: https://reviews.llvm.org/D55842
  -----------------
  As discussed on PR43385 this is causing Visual Studio msbuilds to
  perpetually rebuild all tablegen generated files

Pull in r373664 from upstream llvm trunk (by Nico Weber):

  Reland r349624: Let TableGen write output only if it changed, instead
  of doing so in cmake

  Move the write-if-changed logic behind a flag and don't pass it with
  the MSVC generator. msbuild doesn't have a restat optimization, so
  not doing write-if-change there doesn't have a cost, and it should
  fix whatever causes PR43385.

This should fix the scenario where an incremental build from before
r353358 (the clang 9.0.0 upgrade) to r353358 or later fails to update
the timestamp of the generated lib/clang/headers/arm_fp16.h header.

After such a build, installing world from read-only source and object
directories would attempt to generate the header again, leading to
"clang-tblgen: error opening arm_fp16.h.d:Read-only file system".

Reported by:	avg, np
PR:		241402

MFC r354339:

Merge commit 97e362607 from llvm git (by Nemanja Ivanovic):

  [PowerPC] Do not emit HW loop if the body contains calls to
  lrint/lround

  These two intrinsics are lowered to calls so should prevent the
  formation of CTR loops. In a subsequent patch, we will handle all
  currently known intrinsics and prevent the formation of HW loops if
  any unknown intrinsics are encountered.

  Differential revision: https://reviews.llvm.org/D68841

This should fix an "invalid CRT loop" assertion when building the
www/node port for powerpc64.

Requested by:	Alfredo Dal'Ava Júnior <alfredo.junior@eldorado.org.br>

MFC r354347 (by cem):

Fix llvm-libunwind userspace build on ARM

GCC's libgcc exports a few ARM-specific symbols for ARM EABI, AEABI, or
EHABI or whatever it's called.  Export the same ones from LLVM-libunwind's
libgcc_s, on ARM.  As part of this, convert libgcc_s from a direct
Version.map to one constructed from component Symbol.map files.  This allows
the ARM-specific Symbol.map to be included only on ARM.

Fix ARM-only oddities in struct name/aliases in LLVM-libunwind to match
non-ARM definitions and ARM-specific expectations in libcxxrt /
libcompiler_rt.

No functional change intended for non-ARM architectures.

This commit does not actually flip the switch for ARM defaults from libgcc
to llvm-libunwind, but makes it possible (to compile, anyway).

MFC r354418 (by cem):

clang: Enable unwind tables on !amd64

There doesn't seem to be much sense in defaulting "on" unwind tables on
amd64 and not on other arches.  It causes surprising differences between
platforms, such as the PR below.

Prior to this change, FreeBSD inherited the default implementation of the
method from the Gnu.h Generic_Elf => Generic_GCC parent class, which
returned true only for amd64 targets.  Override that and opt on always,
similar to, e.g., NetBSD.

PR:		241562
Reported by:	lwhsu
Reviewed by:	dim
Discussed with:	emaste
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D22252

MFC r354429:

Merge commit 8e34dd941 from llvm git (by Sanjay Patel):

  [x86] avoid crashing when splitting AVX stores with non-simple type
  (PR43916)

  The store splitting transform was assuming a simple type (MVT), but
  that's not necessarily the case as shown in the test.

This should fix 'Assertion failed: (isSimple() && "Expected a
SimpleValueType!")' when building the security/openssl111 port targeting
a CPU that supports AVX, but not AVX2, such as sandybridge.

PR:		241747

MFC r354469:

Merge commit f596f4507 from llvm git (by Sam Elliott):

  [RISCV] Add Custom Parser for Atomic Memory Operands

  Summary:
  GCC Accepts both (reg) and 0(reg) for atomic instruction memory
  operands. These instructions do not allow for an offset in their
  encoding, so in the latter case, the 0 is silently dropped.

  Due to how we have structured the RISCVAsmParser, the easiest way to
  add support for parsing this offset is to add a custom AsmOperand and
  parser. This parser drops all the parens, and just keeps the
  register.

  This commit also adds a custom printer for these operands, which
  matches the GCC canonical printer, printing both `(a0)` and `0(a0)`
  as `(a0)`.

  Reviewers: asb, lewis-revill

  Reviewed By: asb

  Subscribers: s.egerton, hiraditya, rbar, johnrusso, simoncook,
  apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, MaskRay,
  zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o,
  rkruppe, jfb, PkmX, jocewei, psnobl, benna, Jim, llvm-commits

  Tags: #llvm

  Differential Revision: https://reviews.llvm.org/D65205

  llvm-svn: 367553

Merge commit f596f4507 from llvm git (by Sam Elliott):

  [RISCV] Add FreeBSD targets

  Reviewers: asb

  Reviewed By: asb

  Subscribers: simoncook, s.egerton, lenary, psnobl, benna, mhorne,
  emaste, kito-cheng, shiva0217, rogfer01, rkruppe, cfe-commits

  Tags: #clang

  Differential Revision: https://reviews.llvm.org/D57795

  Patch by James Clarke (jrtc27)

  llvm-svn: 367557

Merge commit f596f4507 from llvm git (by Hsiangkai Wang):

  [DebugInfo] Generate fixups as emitting DWARF .debug_frame/.eh_frame.

  It is necessary to generate fixups in .debug_frame or .eh_frame as
  relaxation is enabled due to the address delta may be changed after
  relaxation.

  There is an opcode with 6-bits data in debug frame encoding. So, we
  also need 6-bits fixup types.

  Differential Revision: https://reviews.llvm.org/D58335

  llvm-svn: 366524

Merge commit f596f4507 from llvm git (by Hsiangkai Wang):

  [DebugInfo] Some fields do not need relocations even relax is enabled.

  In debug frame information, some fields, e.g., Length in CIE/FDE and
  Offset in FDE are attributes to describe the structure of CIE/FDE.
  They are not related to the relaxed code. However, these attributes
  are symbol differences. So, in current design, these attributes will
  be filled as zero and LLVM generates relocations for them.

  We only need to generate relocations for symbols in executable
  sections.  So, if the symbols are not located in executable sections,
  we still evaluate their values under relaxation.

  Differential Revision: https://reviews.llvm.org/D61584

  llvm-svn: 366531

Merge commit f596f4507 from llvm git (by Alex Bradbury):

  [RISCV] Don't force absolute FK_Data_X fixups to relocs

  The current behavior of shouldForceRelocation forces relocations for
  the majority of fixups when relaxation is enabled. This makes sense
  for fixups which incorporate symbols but is unnecessary for simple
  data fixups where the fixup target is already resolved to an absolute
  value.

  Differential Revision: https://reviews.llvm.org/D63404
  Patch by Edward Jones.

  llvm-svn: 369257

Merge commit f596f4507 from llvm git (by Alex Bradbury):

  [RISCV] Implement getExprForFDESymbol to ensure RISCV_32_PCREL is
  used for the FDE location

  Follow binutils in using RISCV_32_PCREL for the FDE initial location.
  As explained in the relevant binutils commit
  <https://github.com/riscv/riscv-binutils-gdb/commit/a6cbf936e3dce68114d28cdf60d510a3f78a6d40>,
  the ADD/SUB pair of relocations is problematic in the presence of
  linker relaxation.

  This patch has the same end goal as D64715 but includes test changes
  and avoids adding a new global VariantKind to MCExpr.h (preferring
  RISCVMCExpr VKs like the rest of the RISC-V backend).

  Differential Revision: https://reviews.llvm.org/D66419

  llvm-svn: 369375

This series of merges will permit riscv64 kernels and riscv64sf worlds
to build with clang instead of gcc (but still using the bfd linker).

Requested by:	jhb
Obtained from:	https://github.com/freebsd/freebsd/compare/master...bsdjhb:riscv_clang

MFC r354662 (by jhb):

Sync target triple generation with the version in Makefile.inc1.

Reviewed by:	dim
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D22333

MFC r354692 (by emaste):

llvm: use AT_EXECPATH from ELF auxiliary vectors for getExecutablePath

/proc/curproc/file and the KERN_PROC_PATHNAME sysctl may not return the
desired path if there are multiple hardlinks to the file.

PR:		241932
Tested by:	ler
Sponsored by:	The FreeBSD Foundation

MFC r354707 (by emaste):

llvm: use elf_aux_info to get executable's path, if available

Obtained from:	LLVM a0a38b81ea
MFC with:	r354692
Sponsored by:	The FreeBSD Foundation

MFC r354979:

Merge commit 7bed381ea from llvm git (by Simon Atanasyan):

  [mips] Implement Octeon+ `saa` and `saad` instructions

  `saa` and `saad` are 32-bit and 64-bit store atomic add instructions.

     memory[base] = memory[base] + rt

  These instructions are available for "Octeon+" CPU. The patch adds
  support for both instructions to MIPS assembler and diassembler and
  introduces new CPU type - "octeon+".

  Next patches will implement `.set arch=octeon+` directive and
  `AFL_EXT_OCTEONP` ISA extension flag support.

  Differential Revision: https://reviews.llvm.org/D69849

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354980:

Merge commit 3718102d4 from llvm git (by Simon Atanasyan):

  [mips] Support `octeon+` CPU in the `.set arch=` directive

  Differential Revision: https://reviews.llvm.org/D69850

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354981:

Merge commit bf996f761 from llvm git (by Simon Atanasyan):

  [mips] Write `AFL_EXT_OCTEONP` flag to the `.MIPS.abiflags` section

  Differential Revision: https://reviews.llvm.org/D69851

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354982:

Merge commit 3552d3e0f from llvm git (by Simon Atanasyan):

  [mips] Add `octeon+` to the list of CPUs accepted by the driver

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354983:

Merge commit e578d0fd2 from llvm git (by Simon Atanasyan):

  [mips] Fix `__mips_isa_rev` macros value for Octeon CPU

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354984:

Merge commit 0d14656b9 from llvm git (by Simon Atanasyan):

  [mips] Set __OCTEON__ macros

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r354985:

Merge commit a751f557d from llvm git (by Simon Atanasyan):

  [mips] Set macros for Octeon+ CPU

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans

MFC r355397:

Merge commit 241cbf201 from llvm git (by Nemanja Ivanovic):

  [PowerPC] Fix crash in peephole optimization

  When converting reg+reg shifts to reg+imm rotates, we neglect to
  consider the CodeGenOnly versions of the 32-bit shift mnemonics. This
  means we produce a rotate with missing operands which causes a crash.

  Committing this fix without review since it is non-controversial that
  the list of mnemonics to consider should include the 64-bit aliases
  for the exact mnemonics.

  Fixes PR44183.

This should fix "Assertion failed: (idx < size()), function operator[],
file /usr/src/contrib/llvm/include/llvm/ADT/SmallVector.h, line 153"
when building the graphics/mesa-dri port for the PowerPC64 ELFv2 ABI.

Reported by:	Alfredo Dal'Ava Júnior <alfredo.junior@eldorado.org.br>

MFC r355602:

Add a few missed source files to libllvm, for the MK_LLVM_TARGET_BPF=yes
case.  Otherwise, linking of clang and other llvm based executables
would complain about missing symbols.

Reported by:	rstone

MFC r355645 (by cem):

arm: libgcc_s: Fix ABI breakage introduced in r354347

Provide the symbol version for llvm-libunwind's _Unwind_Backtrace that libgcc
has historically provided on arm, in addition to the (default) standard version
used on all other arch.

Reported by:	mmel

MFC r355803 (by mmel):

Fix LLVM libunwnwind _Unwind_Backtrace symbol version for ARM.
In original  GNU libgcc, _Unwind_Backtrace is published with GCC_3.3 version
for all architectures but ARM. For ARM should be publishes with GCC_4.3.0
version. This was originally omitted in r255095, fixed in r318024 and omitted
aging in LLVM libunwind implementation in r354347.

For ARM _Unwind_Backtrace should be published as default with GCC_4.3.0
version , (because this is right original version) and again as
normal(not-default) with GCC_3.3 version (to maintain ABI compatibility
compiled/linked with wrong pre r318024 libgcc)

PR:	233664