Merge llvm-project 12.0.1 release and follow-up fixes

Merge llvm-project main llvmorg-12-init-17869-g8e464dd76bef

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12-init-17869-g8e464dd76bef, the last commit before the
upstream release/12.x branch was created.

PR:		255570

(cherry picked from commit e8d8bef961a50d4dc22501cde4fb9fb0be1b2532)

Merge llvm-project 12.0.0 release

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.0-0-gd28af7c654d8, a.k.a. 12.0.0 release.

PR:		255570

(cherry picked from commit d409305fa3838fb39b38c26fc085fb729b8766d5)

Disable strict-fp for powerpcspe, as it does not work properly yet

Merge commit 5c18d1136665 from llvm git (by Qiu Chaofan)

  [SPE] Disable strict-fp for SPE by default

  As discussed in PR50385, strict-fp on PowerPC SPE has not been
  handled well. This patch disables it by default for SPE.

  Reviewed By: nemanjai, vit9696, jhibbits

  Differential Revision: https://reviews.llvm.org/D103235

PR:		255570

(cherry picked from commit 715df83abc049b23d9acddc81f2480bd4c056d64)

Apply upstream libc++ fix to allow building with devel/xxx-xtoolchain-gcc

Merge commit 52e9d80d5db2 from llvm git (by Jason Liu):

  [libc++] add `inline` for __open's definition in ifstream and ofstream

  Summary:

  When building with gcc on AIX, it seems that gcc does not like the
  `always_inline` without the `inline` keyword.
  So adding the inline keywords in for __open in ifstream and ofstream.
  That will also make it consistent with __open in basic_filebuf
  (it seems we added `inline` there before for gcc build as well).

  Differential Revision: https://reviews.llvm.org/D99422

PR:		255570

(cherry picked from commit d099db25464b826c5724cf2fb5b22292bbe15f6e)

Undefine HAVE_(DE)REGISTER_FRAME in llvm's config.h on arm

Otherwise, the lli tool (enable by WITH_CLANG_EXTRAS) won't link on arm,
stating that __register_frame is undefined. This function is normally
provided by libunwind, but explicitly not for the ARM Exception ABI.

Reported by:	oh
PR:		255570

(cherry picked from commit f336b45e943c7f9a90ffcea1a6c4c7039e54c73c)

Merge llvm-project 12.0.1 rc2

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.1-rc2-0-ge7dac564cd0e, a.k.a. 12.0.1 rc2.

PR:		255570

(cherry picked from commit 23408297fbf3089f0388a8873b02fa75ab3f5bb9)

Revert libunwind change to fix backtrace segfault on aarch64

Revert commit 22b615a96593 from llvm git (by Daniel Kiss):

  [libunwind] Support for leaf function unwinding.

  Unwinding leaf function is useful in cases when the backtrace finds a
  leaf function for example when it caused a signal.
  This patch also add the support for the DW_CFA_undefined because it marks
  the end of the frames.

  Ryan Prichard provided code for the tests.

  Reviewed By: #libunwind, mstorsjo

  Differential Revision: https://reviews.llvm.org/D83573

  Reland with limit the test to the x86_64-linux target.

Bisection has shown that this particular upstream commit causes programs
using backtrace(3) on aarch64 to segfault. This affects the lang/rust
port, for instance. Until we can upstream to fix this problem, revert
the commit for now.

Reported by:	mikael
PR:		256864

(cherry picked from commit 5866c369e4fd917c0d456f0f10b92ee354b82279)

Merge llvm-project 12.0.1 release

This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and
openmp to llvmorg-12.0.1-0-gfed41342a82f, a.k.a. 12.0.1 release.

PR:		255570

(cherry picked from commit 4652422eb477731f284b1345afeefef7f269da50)

compilert-rt: build out-of-line LSE atomics helpers for aarch64

Both clang >= 12 and gcc >= 10.1 now default to -moutline-atomics for
aarch64. This requires a bunch of helper functions in libcompiler_rt.a,
to avoid link errors like "undefined symbol: __aarch64_ldadd8_acq_rel".

(Note: of course you can use -mno-outline-atomics as a workaround too,
but this would negate the potential performance benefit of the faster
LSE instructions.)

Bump __FreeBSD_version so ports maintainers can easily detect this.

PR:		257392

(cherry picked from commit cc55ee8009a550810d38777fd6ace9abf3a2f6b4)

1 files changed, 366 insertions, 0 deletions

diff --git a/contrib/llvm-project/compiler-rt/lib/memprof/memprof_interceptors.cpp b/contrib/llvm-project/compiler-rt/lib/memprof/memprof_interceptors.cpp
new file mode 100644
index 000000000000..caa629b9c474
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/memprof/memprof_interceptors.cpp
@@ -0,0 +1,366 @@
+//===-- memprof_interceptors.cpp -----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemProfiler, a memory profiler.
+//
+// Intercept various libc functions.
+//===----------------------------------------------------------------------===//
+
+#include "memprof_interceptors.h"
+#include "memprof_allocator.h"
+#include "memprof_internal.h"
+#include "memprof_mapping.h"
+#include "memprof_stack.h"
+#include "memprof_stats.h"
+#include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_posix.h"
+
+namespace __memprof {
+
+#define MEMPROF_READ_STRING(s, n) MEMPROF_READ_RANGE((s), (n))
+
+static inline uptr MaybeRealStrnlen(const char *s, uptr maxlen) {
+#if SANITIZER_INTERCEPT_STRNLEN
+  if (REAL(strnlen)) {
+    return REAL(strnlen)(s, maxlen);
+  }
+#endif
+  return internal_strnlen(s, maxlen);
+}
+
+void SetThreadName(const char *name) {
+  MemprofThread *t = GetCurrentThread();
+  if (t)
+    memprofThreadRegistry().SetThreadName(t->tid(), name);
+}
+
+int OnExit() {
+  // FIXME: ask frontend whether we need to return failure.
+  return 0;
+}
+
+} // namespace __memprof
+
+// ---------------------- Wrappers ---------------- {{{1
+using namespace __memprof;
+
+DECLARE_REAL_AND_INTERCEPTOR(void *, malloc, uptr)
+DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
+
+#define MEMPROF_INTERCEPTOR_ENTER(ctx, func)                                   \
+  ctx = 0;                                                                     \
+  (void)ctx;
+
+#define COMMON_INTERCEPT_FUNCTION(name) MEMPROF_INTERCEPT_FUNC(name)
+#define COMMON_INTERCEPT_FUNCTION_VER(name, ver)                               \
+  MEMPROF_INTERCEPT_FUNC_VER(name, ver)
+#define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                         \
+  MEMPROF_WRITE_RANGE(ptr, size)
+#define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                          \
+  MEMPROF_READ_RANGE(ptr, size)
+#define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)                               \
+  MEMPROF_INTERCEPTOR_ENTER(ctx, func);                                        \
+  do {                                                                         \
+    if (memprof_init_is_running)                                               \
+      return REAL(func)(__VA_ARGS__);                                          \
+    ENSURE_MEMPROF_INITED();                                                   \
+  } while (false)
+#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path)                              \
+  do {                                                                         \
+  } while (false)
+#define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd)                                 \
+  do {                                                                         \
+  } while (false)
+#define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd)                                 \
+  do {                                                                         \
+  } while (false)
+#define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd)                    \
+  do {                                                                         \
+  } while (false)
+#define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name) SetThreadName(name)
+// Should be memprofThreadRegistry().SetThreadNameByUserId(thread, name)
+// But memprof does not remember UserId's for threads (pthread_t);
+// and remembers all ever existed threads, so the linear search by UserId
+// can be slow.
+#define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name)                 \
+  do {                                                                         \
+  } while (false)
+#define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
+#define COMMON_INTERCEPTOR_ON_DLOPEN(filename, flag)                           \
+  do {                                                                         \
+    CheckNoDeepBind(filename, flag);                                           \
+  } while (false)
+#define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
+#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle)
+#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED()
+#define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!memprof_inited)
+#define COMMON_INTERCEPTOR_GET_TLS_RANGE(begin, end)                           \
+  if (MemprofThread *t = GetCurrentThread()) {                                 \
+    *begin = t->tls_begin();                                                   \
+    *end = t->tls_end();                                                       \
+  } else {                                                                     \
+    *begin = *end = 0;                                                         \
+  }
+
+#define COMMON_INTERCEPTOR_MEMMOVE_IMPL(ctx, to, from, size)                   \
+  do {                                                                         \
+    MEMPROF_INTERCEPTOR_ENTER(ctx, memmove);                                   \
+    MEMPROF_MEMMOVE_IMPL(to, from, size);                                      \
+  } while (false)
+
+#define COMMON_INTERCEPTOR_MEMCPY_IMPL(ctx, to, from, size)                    \
+  do {                                                                         \
+    MEMPROF_INTERCEPTOR_ENTER(ctx, memcpy);                                    \
+    MEMPROF_MEMCPY_IMPL(to, from, size);                                       \
+  } while (false)
+
+#define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size)                    \
+  do {                                                                         \
+    MEMPROF_INTERCEPTOR_ENTER(ctx, memset);                                    \
+    MEMPROF_MEMSET_IMPL(block, c, size);                                       \
+  } while (false)
+
+#include "sanitizer_common/sanitizer_common_interceptors.inc"
+
+#define COMMON_SYSCALL_PRE_READ_RANGE(p, s) MEMPROF_READ_RANGE(p, s)
+#define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) MEMPROF_WRITE_RANGE(p, s)
+#define COMMON_SYSCALL_POST_READ_RANGE(p, s)                                   \
+  do {                                                                         \
+    (void)(p);                                                                 \
+    (void)(s);                                                                 \
+  } while (false)
+#define COMMON_SYSCALL_POST_WRITE_RANGE(p, s)                                  \
+  do {                                                                         \
+    (void)(p);                                                                 \
+    (void)(s);                                                                 \
+  } while (false)
+#include "sanitizer_common/sanitizer_common_syscalls.inc"
+
+struct ThreadStartParam {
+  atomic_uintptr_t t;
+  atomic_uintptr_t is_registered;
+};
+
+static thread_return_t THREAD_CALLING_CONV memprof_thread_start(void *arg) {
+  ThreadStartParam *param = reinterpret_cast<ThreadStartParam *>(arg);
+  MemprofThread *t = nullptr;
+  while ((t = reinterpret_cast<MemprofThread *>(
+              atomic_load(&param->t, memory_order_acquire))) == nullptr)
+    internal_sched_yield();
+  SetCurrentThread(t);
+  return t->ThreadStart(GetTid(), &param->is_registered);
+}
+
+INTERCEPTOR(int, pthread_create, void *thread, void *attr,
+            void *(*start_routine)(void *), void *arg) {
+  EnsureMainThreadIDIsCorrect();
+  GET_STACK_TRACE_THREAD;
+  int detached = 0;
+  if (attr)
+    REAL(pthread_attr_getdetachstate)(attr, &detached);
+  ThreadStartParam param;
+  atomic_store(&param.t, 0, memory_order_relaxed);
+  atomic_store(&param.is_registered, 0, memory_order_relaxed);
+  int result;
+  {
+    // Ignore all allocations made by pthread_create: thread stack/TLS may be
+    // stored by pthread for future reuse even after thread destruction, and
+    // the linked list it's stored in doesn't even hold valid pointers to the
+    // objects, the latter are calculated by obscure pointer arithmetic.
+    result = REAL(pthread_create)(thread, attr, memprof_thread_start, &param);
+  }
+  if (result == 0) {
+    u32 current_tid = GetCurrentTidOrInvalid();
+    MemprofThread *t = MemprofThread::Create(start_routine, arg, current_tid,
+                                             &stack, detached);
+    atomic_store(&param.t, reinterpret_cast<uptr>(t), memory_order_release);
+    // Wait until the MemprofThread object is initialized and the
+    // ThreadRegistry entry is in "started" state.
+    while (atomic_load(&param.is_registered, memory_order_acquire) == 0)
+      internal_sched_yield();
+  }
+  return result;
+}
+
+INTERCEPTOR(int, pthread_join, void *t, void **arg) {
+  return real_pthread_join(t, arg);
+}
+
+DEFINE_REAL_PTHREAD_FUNCTIONS
+
+INTERCEPTOR(char *, index, const char *string, int c)
+ALIAS(WRAPPER_NAME(strchr));
+
+// For both strcat() and strncat() we need to check the validity of |to|
+// argument irrespective of the |from| length.
+INTERCEPTOR(char *, strcat, char *to, const char *from) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strcat);
+  ENSURE_MEMPROF_INITED();
+  uptr from_length = REAL(strlen)(from);
+  MEMPROF_READ_RANGE(from, from_length + 1);
+  uptr to_length = REAL(strlen)(to);
+  MEMPROF_READ_STRING(to, to_length);
+  MEMPROF_WRITE_RANGE(to + to_length, from_length + 1);
+  return REAL(strcat)(to, from);
+}
+
+INTERCEPTOR(char *, strncat, char *to, const char *from, uptr size) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strncat);
+  ENSURE_MEMPROF_INITED();
+  uptr from_length = MaybeRealStrnlen(from, size);
+  uptr copy_length = Min(size, from_length + 1);
+  MEMPROF_READ_RANGE(from, copy_length);
+  uptr to_length = REAL(strlen)(to);
+  MEMPROF_READ_STRING(to, to_length);
+  MEMPROF_WRITE_RANGE(to + to_length, from_length + 1);
+  return REAL(strncat)(to, from, size);
+}
+
+INTERCEPTOR(char *, strcpy, char *to, const char *from) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strcpy);
+  if (memprof_init_is_running) {
+    return REAL(strcpy)(to, from);
+  }
+  ENSURE_MEMPROF_INITED();
+  uptr from_size = REAL(strlen)(from) + 1;
+  MEMPROF_READ_RANGE(from, from_size);
+  MEMPROF_WRITE_RANGE(to, from_size);
+  return REAL(strcpy)(to, from);
+}
+
+INTERCEPTOR(char *, strdup, const char *s) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strdup);
+  if (UNLIKELY(!memprof_inited))
+    return internal_strdup(s);
+  ENSURE_MEMPROF_INITED();
+  uptr length = REAL(strlen)(s);
+  MEMPROF_READ_RANGE(s, length + 1);
+  GET_STACK_TRACE_MALLOC;
+  void *new_mem = memprof_malloc(length + 1, &stack);
+  REAL(memcpy)(new_mem, s, length + 1);
+  return reinterpret_cast<char *>(new_mem);
+}
+
+INTERCEPTOR(char *, __strdup, const char *s) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strdup);
+  if (UNLIKELY(!memprof_inited))
+    return internal_strdup(s);
+  ENSURE_MEMPROF_INITED();
+  uptr length = REAL(strlen)(s);
+  MEMPROF_READ_RANGE(s, length + 1);
+  GET_STACK_TRACE_MALLOC;
+  void *new_mem = memprof_malloc(length + 1, &stack);
+  REAL(memcpy)(new_mem, s, length + 1);
+  return reinterpret_cast<char *>(new_mem);
+}
+
+INTERCEPTOR(char *, strncpy, char *to, const char *from, uptr size) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strncpy);
+  ENSURE_MEMPROF_INITED();
+  uptr from_size = Min(size, MaybeRealStrnlen(from, size) + 1);
+  MEMPROF_READ_RANGE(from, from_size);
+  MEMPROF_WRITE_RANGE(to, size);
+  return REAL(strncpy)(to, from, size);
+}
+
+INTERCEPTOR(long, strtol, const char *nptr, char **endptr, int base) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strtol);
+  ENSURE_MEMPROF_INITED();
+  char *real_endptr;
+  long result = REAL(strtol)(nptr, &real_endptr, base);
+  StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
+  return result;
+}
+
+INTERCEPTOR(int, atoi, const char *nptr) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, atoi);
+  ENSURE_MEMPROF_INITED();
+  char *real_endptr;
+  // "man atoi" tells that behavior of atoi(nptr) is the same as
+  // strtol(nptr, 0, 10), i.e. it sets errno to ERANGE if the
+  // parsed integer can't be stored in *long* type (even if it's
+  // different from int). So, we just imitate this behavior.
+  int result = REAL(strtol)(nptr, &real_endptr, 10);
+  FixRealStrtolEndptr(nptr, &real_endptr);
+  MEMPROF_READ_STRING(nptr, (real_endptr - nptr) + 1);
+  return result;
+}
+
+INTERCEPTOR(long, atol, const char *nptr) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, atol);
+  ENSURE_MEMPROF_INITED();
+  char *real_endptr;
+  long result = REAL(strtol)(nptr, &real_endptr, 10);
+  FixRealStrtolEndptr(nptr, &real_endptr);
+  MEMPROF_READ_STRING(nptr, (real_endptr - nptr) + 1);
+  return result;
+}
+
+INTERCEPTOR(long long, strtoll, const char *nptr, char **endptr, int base) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, strtoll);
+  ENSURE_MEMPROF_INITED();
+  char *real_endptr;
+  long long result = REAL(strtoll)(nptr, &real_endptr, base);
+  StrtolFixAndCheck(ctx, nptr, endptr, real_endptr, base);
+  return result;
+}
+
+INTERCEPTOR(long long, atoll, const char *nptr) {
+  void *ctx;
+  MEMPROF_INTERCEPTOR_ENTER(ctx, atoll);
+  ENSURE_MEMPROF_INITED();
+  char *real_endptr;
+  long long result = REAL(strtoll)(nptr, &real_endptr, 10);
+  FixRealStrtolEndptr(nptr, &real_endptr);
+  MEMPROF_READ_STRING(nptr, (real_endptr - nptr) + 1);
+  return result;
+}
+
+// ---------------------- InitializeMemprofInterceptors ---------------- {{{1
+namespace __memprof {
+void InitializeMemprofInterceptors() {
+  static bool was_called_once;
+  CHECK(!was_called_once);
+  was_called_once = true;
+  InitializeCommonInterceptors();
+
+  // Intercept str* functions.
+  MEMPROF_INTERCEPT_FUNC(strcat);
+  MEMPROF_INTERCEPT_FUNC(strcpy);
+  MEMPROF_INTERCEPT_FUNC(strncat);
+  MEMPROF_INTERCEPT_FUNC(strncpy);
+  MEMPROF_INTERCEPT_FUNC(strdup);
+  MEMPROF_INTERCEPT_FUNC(__strdup);
+  MEMPROF_INTERCEPT_FUNC(index);
+
+  MEMPROF_INTERCEPT_FUNC(atoi);
+  MEMPROF_INTERCEPT_FUNC(atol);
+  MEMPROF_INTERCEPT_FUNC(strtol);
+  MEMPROF_INTERCEPT_FUNC(atoll);
+  MEMPROF_INTERCEPT_FUNC(strtoll);
+
+  // Intercept threading-related functions
+  MEMPROF_INTERCEPT_FUNC(pthread_create);
+  MEMPROF_INTERCEPT_FUNC(pthread_join);
+
+  InitializePlatformInterceptors();
+
+  VReport(1, "MemProfiler: libc interceptors initialized\n");
+}
+
+} // namespace __memprof