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diff --git a/mozglue/baseprofiler/core/platform-macos.cpp b/mozglue/baseprofiler/core/platform-macos.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <unistd.h>
+#include <sys/mman.h>
+#include <mach/mach_init.h>
+#include <mach-o/getsect.h>
+
+#include <AvailabilityMacros.h>
+
+#include <pthread.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <libkern/OSAtomic.h>
+#include <mach/mach.h>
+#include <mach/semaphore.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+#include <mach/vm_statistics.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <math.h>
+
+// this port is based off of v8 svn revision 9837
+
+namespace mozilla {
+namespace baseprofiler {
+
+static int64_t MicrosecondsSince1970() {
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ return int64_t(tv.tv_sec) * 1000000 + int64_t(tv.tv_usec);
+}
+
+void* GetStackTop(void* aGuess) {
+ pthread_t thread = pthread_self();
+ return pthread_get_stackaddr_np(thread);
+}
+
+class PlatformData {
+ public:
+ explicit PlatformData(BaseProfilerThreadId aThreadId)
+ : mProfiledThread(mach_thread_self()) {}
+
+ ~PlatformData() {
+ // Deallocate Mach port for thread.
+ mach_port_deallocate(mach_task_self(), mProfiledThread);
+ }
+
+ thread_act_t ProfiledThread() { return mProfiledThread; }
+
+ private:
+ // Note: for mProfiledThread Mach primitives are used instead of pthread's
+ // because the latter doesn't provide thread manipulation primitives required.
+ // For details, consult "Mac OS X Internals" book, Section 7.3.
+ thread_act_t mProfiledThread;
+};
+
+////////////////////////////////////////////////////////////////////////
+// BEGIN Sampler target specifics
+
+Sampler::Sampler(PSLockRef aLock) {}
+
+void Sampler::Disable(PSLockRef aLock) {}
+
+template <typename Func>
+void Sampler::SuspendAndSampleAndResumeThread(
+ PSLockRef aLock, const RegisteredThread& aRegisteredThread,
+ const TimeStamp& aNow, const Func& aProcessRegs) {
+ thread_act_t samplee_thread =
+ aRegisteredThread.GetPlatformData()->ProfiledThread();
+
+ //----------------------------------------------------------------//
+ // Suspend the samplee thread and get its context.
+
+ // We're using thread_suspend on OS X because pthread_kill (which is what we
+ // at one time used on Linux) has less consistent performance and causes
+ // strange crashes, see bug 1166778 and bug 1166808. thread_suspend
+ // is also just a lot simpler to use.
+
+ if (KERN_SUCCESS != thread_suspend(samplee_thread)) {
+ return;
+ }
+
+ //----------------------------------------------------------------//
+ // Sample the target thread.
+
+ // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+ //
+ // The profiler's "critical section" begins here. We must be very careful
+ // what we do here, or risk deadlock. See the corresponding comment in
+ // platform-linux-android.cpp for details.
+
+#if defined(__x86_64__)
+ thread_state_flavor_t flavor = x86_THREAD_STATE64;
+ x86_thread_state64_t state;
+ mach_msg_type_number_t count = x86_THREAD_STATE64_COUNT;
+# if __DARWIN_UNIX03
+# define REGISTER_FIELD(name) __r##name
+# else
+# define REGISTER_FIELD(name) r##name
+# endif // __DARWIN_UNIX03
+#elif defined(__aarch64__)
+ thread_state_flavor_t flavor = ARM_THREAD_STATE64;
+ arm_thread_state64_t state;
+ mach_msg_type_number_t count = ARM_THREAD_STATE64_COUNT;
+# if __DARWIN_UNIX03
+# define REGISTER_FIELD(name) __##name
+# else
+# define REGISTER_FIELD(name) name
+# endif // __DARWIN_UNIX03
+#else
+# error "unknown architecture"
+#endif
+
+ if (thread_get_state(samplee_thread, flavor,
+ reinterpret_cast<natural_t*>(&state),
+ &count) == KERN_SUCCESS) {
+ Registers regs;
+#if defined(__x86_64__)
+ regs.mPC = reinterpret_cast<Address>(state.REGISTER_FIELD(ip));
+ regs.mSP = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
+ regs.mFP = reinterpret_cast<Address>(state.REGISTER_FIELD(bp));
+ regs.mLR = 0;
+#elif defined(__aarch64__)
+ regs.mPC = reinterpret_cast<Address>(state.REGISTER_FIELD(pc));
+ regs.mSP = reinterpret_cast<Address>(state.REGISTER_FIELD(sp));
+ regs.mFP = reinterpret_cast<Address>(state.REGISTER_FIELD(fp));
+ regs.mLR = reinterpret_cast<Address>(state.REGISTER_FIELD(lr));
+#else
+# error "unknown architecture"
+#endif
+
+ aProcessRegs(regs, aNow);
+ }
+
+#undef REGISTER_FIELD
+
+ //----------------------------------------------------------------//
+ // Resume the target thread.
+
+ thread_resume(samplee_thread);
+
+ // The profiler's critical section ends here.
+ //
+ // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
+}
+
+// END Sampler target specifics
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+// BEGIN SamplerThread target specifics
+
+static void* ThreadEntry(void* aArg) {
+ auto thread = static_cast<SamplerThread*>(aArg);
+ thread->Run();
+ return nullptr;
+}
+
+SamplerThread::SamplerThread(PSLockRef aLock, uint32_t aActivityGeneration,
+ double aIntervalMilliseconds, uint32_t aFeatures)
+ : mSampler(aLock),
+ mActivityGeneration(aActivityGeneration),
+ mIntervalMicroseconds(
+ std::max(1, int(floor(aIntervalMilliseconds * 1000 + 0.5)))),
+ mThread{nullptr} {
+ pthread_attr_t* attr_ptr = nullptr;
+ if (pthread_create(&mThread, attr_ptr, ThreadEntry, this) != 0) {
+ MOZ_CRASH("pthread_create failed");
+ }
+}
+
+SamplerThread::~SamplerThread() { pthread_join(mThread, nullptr); }
+
+void SamplerThread::SleepMicro(uint32_t aMicroseconds) {
+ usleep(aMicroseconds);
+ // FIXME: the OSX 10.12 page for usleep says "The usleep() function is
+ // obsolescent. Use nanosleep(2) instead." This implementation could be
+ // merged with the linux-android version. Also, this doesn't handle the
+ // case where the usleep call is interrupted by a signal.
+}
+
+void SamplerThread::Stop(PSLockRef aLock) { mSampler.Disable(aLock); }
+
+// END SamplerThread target specifics
+////////////////////////////////////////////////////////////////////////
+
+static void PlatformInit(PSLockRef aLock) {}
+
+// clang-format off
+#if defined(HAVE_NATIVE_UNWIND)
+// Derive the stack pointer from the frame pointer. The 0x10 offset is
+// 8 bytes for the previous frame pointer and 8 bytes for the return
+// address both stored on the stack after at the beginning of the current
+// frame.
+# define REGISTERS_SYNC_POPULATE(regs) \
+ regs.mSP = reinterpret_cast<Address>(__builtin_frame_address(0)) + 0x10; \
+ _Pragma("GCC diagnostic push") \
+ _Pragma("GCC diagnostic ignored \"-Wframe-address\"") \
+ regs.mFP = reinterpret_cast<Address>(__builtin_frame_address(1)); \
+ _Pragma("GCC diagnostic pop") \
+ regs.mPC = reinterpret_cast<Address>( \
+ __builtin_extract_return_addr(__builtin_return_address(0))); \
+ regs.mLR = 0;
+#endif
+// clang-format on
+
+} // namespace baseprofiler
+} // namespace mozilla
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