1 files changed, 181 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_mac.cpp b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_mac.cpp
new file mode 100644
index 000000000000..813616467656
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_mac.cpp
@@ -0,0 +1,181 @@
+//===-- sanitizer_stoptheworld_mac.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
+//
+//===----------------------------------------------------------------------===//
+//
+// See sanitizer_stoptheworld.h for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_platform.h"
+
+#if SANITIZER_APPLE && (defined(__x86_64__) || defined(__aarch64__) || \
+                      defined(__i386))
+
+#include <mach/mach.h>
+#include <mach/thread_info.h>
+#include <pthread.h>
+
+#include "sanitizer_stoptheworld.h"
+
+namespace __sanitizer {
+typedef struct {
+  tid_t tid;
+  thread_t thread;
+} SuspendedThreadInfo;
+
+class SuspendedThreadsListMac final : public SuspendedThreadsList {
+ public:
+  SuspendedThreadsListMac() = default;
+
+  tid_t GetThreadID(uptr index) const override;
+  thread_t GetThread(uptr index) const;
+  uptr ThreadCount() const override;
+  bool ContainsThread(thread_t thread) const;
+  void Append(thread_t thread);
+
+  PtraceRegistersStatus GetRegistersAndSP(uptr index,
+                                          InternalMmapVector<uptr> *buffer,
+                                          uptr *sp) const override;
+
+ private:
+  InternalMmapVector<SuspendedThreadInfo> threads_;
+};
+
+struct RunThreadArgs {
+  StopTheWorldCallback callback;
+  void *argument;
+};
+
+void *RunThread(void *arg) {
+  struct RunThreadArgs *run_args = (struct RunThreadArgs *)arg;
+  SuspendedThreadsListMac suspended_threads_list;
+
+  thread_array_t threads;
+  mach_msg_type_number_t num_threads;
+  kern_return_t err = task_threads(mach_task_self(), &threads, &num_threads);
+  if (err != KERN_SUCCESS) {
+    VReport(1, "Failed to get threads for task (errno %d).\n", err);
+    return nullptr;
+  }
+
+  thread_t thread_self = mach_thread_self();
+  for (unsigned int i = 0; i < num_threads; ++i) {
+    if (threads[i] == thread_self) continue;
+
+    thread_suspend(threads[i]);
+    suspended_threads_list.Append(threads[i]);
+  }
+
+  run_args->callback(suspended_threads_list, run_args->argument);
+
+  uptr num_suspended = suspended_threads_list.ThreadCount();
+  for (unsigned int i = 0; i < num_suspended; ++i) {
+    thread_resume(suspended_threads_list.GetThread(i));
+  }
+  return nullptr;
+}
+
+void StopTheWorld(StopTheWorldCallback callback, void *argument) {
+  struct RunThreadArgs arg = {callback, argument};
+  pthread_t run_thread = (pthread_t)internal_start_thread(RunThread, &arg);
+  internal_join_thread(run_thread);
+}
+
+#if defined(__x86_64__)
+typedef x86_thread_state64_t regs_struct;
+#define regs_flavor x86_THREAD_STATE64
+
+#define SP_REG __rsp
+
+#elif defined(__aarch64__)
+typedef arm_thread_state64_t regs_struct;
+#define regs_flavor ARM_THREAD_STATE64
+
+# if __DARWIN_UNIX03
+#  define SP_REG __sp
+# else
+#  define SP_REG sp
+# endif
+
+#elif defined(__i386)
+typedef x86_thread_state32_t regs_struct;
+#define regs_flavor x86_THREAD_STATE32
+
+#define SP_REG __esp
+
+#else
+#error "Unsupported architecture"
+#endif
+
+tid_t SuspendedThreadsListMac::GetThreadID(uptr index) const {
+  CHECK_LT(index, threads_.size());
+  return threads_[index].tid;
+}
+
+thread_t SuspendedThreadsListMac::GetThread(uptr index) const {
+  CHECK_LT(index, threads_.size());
+  return threads_[index].thread;
+}
+
+uptr SuspendedThreadsListMac::ThreadCount() const {
+  return threads_.size();
+}
+
+bool SuspendedThreadsListMac::ContainsThread(thread_t thread) const {
+  for (uptr i = 0; i < threads_.size(); i++) {
+    if (threads_[i].thread == thread) return true;
+  }
+  return false;
+}
+
+void SuspendedThreadsListMac::Append(thread_t thread) {
+  thread_identifier_info_data_t info;
+  mach_msg_type_number_t info_count = THREAD_IDENTIFIER_INFO_COUNT;
+  kern_return_t err = thread_info(thread, THREAD_IDENTIFIER_INFO,
+                                  (thread_info_t)&info, &info_count);
+  if (err != KERN_SUCCESS) {
+    VReport(1, "Error - unable to get thread ident for a thread\n");
+    return;
+  }
+  threads_.push_back({info.thread_id, thread});
+}
+
+PtraceRegistersStatus SuspendedThreadsListMac::GetRegistersAndSP(
+    uptr index, InternalMmapVector<uptr> *buffer, uptr *sp) const {
+  thread_t thread = GetThread(index);
+  regs_struct regs;
+  int err;
+  mach_msg_type_number_t reg_count = sizeof(regs) / sizeof(natural_t);
+  err = thread_get_state(thread, regs_flavor, (thread_state_t)&regs,
+                         &reg_count);
+  if (err != KERN_SUCCESS) {
+    VReport(1, "Error - unable to get registers for a thread\n");
+    // MIG_ARRAY_TOO_LARGE, means that the state is too large, but it's
+    // still safe to proceed.
+    return err == MIG_ARRAY_TOO_LARGE ? REGISTERS_UNAVAILABLE
+                                      : REGISTERS_UNAVAILABLE_FATAL;
+  }
+
+  buffer->resize(RoundUpTo(sizeof(regs), sizeof(uptr)) / sizeof(uptr));
+  internal_memcpy(buffer->data(), &regs, sizeof(regs));
+#if defined(__aarch64__) && defined(arm_thread_state64_get_sp)
+  *sp = arm_thread_state64_get_sp(regs);
+#else
+  *sp = regs.SP_REG;
+#endif
+
+  // On x86_64 and aarch64, we must account for the stack redzone, which is 128
+  // bytes.
+  if (SANITIZER_WORDSIZE == 64) *sp -= 128;
+
+  return REGISTERS_AVAILABLE;
+}
+
+} // namespace __sanitizer
+
+#endif  // SANITIZER_APPLE && (defined(__x86_64__) || defined(__aarch64__)) ||
+        //                   defined(__i386))