| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| #include "platform/globals.h" |
| #if defined(HOST_OS_MACOS) |
| |
| #include <assert.h> // NOLINT |
| #include <errno.h> // NOLINT |
| #include <stdbool.h> // NOLINT |
| #include <sys/sysctl.h> // NOLINT |
| #include <sys/types.h> // NOLINT |
| #include <unistd.h> // NOLINT |
| |
| #include "vm/flags.h" |
| #include "vm/os.h" |
| #include "vm/profiler.h" |
| #include "vm/signal_handler.h" |
| #include "vm/thread_interrupter.h" |
| |
| namespace dart { |
| |
| #ifndef PRODUCT |
| |
| DECLARE_FLAG(bool, trace_thread_interrupter); |
| |
| // Returns true if the current process is being debugged (either |
| // running under the debugger or has a debugger attached post facto). |
| // Code from https://developer.apple.com/library/content/qa/qa1361/_index.html |
| bool ThreadInterrupter::IsDebuggerAttached() { |
| struct kinfo_proc info; |
| // Initialize the flags so that, if sysctl fails for some bizarre |
| // reason, we get a predictable result. |
| info.kp_proc.p_flag = 0; |
| // Initialize mib, which tells sysctl the info we want, in this case |
| // we're looking for information about a specific process ID. |
| int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()}; |
| size_t size = sizeof(info); |
| |
| // Call sysctl. |
| size = sizeof(info); |
| int junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &size, NULL, 0); |
| ASSERT(junk == 0); |
| // We're being debugged if the P_TRACED flag is set. |
| return ((info.kp_proc.p_flag & P_TRACED) != 0); |
| } |
| |
| class ThreadInterrupterMacOS : public AllStatic { |
| public: |
| static void ThreadInterruptSignalHandler(int signal, |
| siginfo_t* info, |
| void* context_) { |
| if (signal != SIGPROF) { |
| return; |
| } |
| Thread* thread = Thread::Current(); |
| if (thread == NULL) { |
| return; |
| } |
| // Extract thread state. |
| ucontext_t* context = reinterpret_cast<ucontext_t*>(context_); |
| mcontext_t mcontext = context->uc_mcontext; |
| InterruptedThreadState its; |
| its.pc = SignalHandler::GetProgramCounter(mcontext); |
| its.fp = SignalHandler::GetFramePointer(mcontext); |
| its.csp = SignalHandler::GetCStackPointer(mcontext); |
| its.dsp = SignalHandler::GetDartStackPointer(mcontext); |
| its.lr = SignalHandler::GetLinkRegister(mcontext); |
| Profiler::SampleThread(thread, its); |
| } |
| }; |
| |
| void ThreadInterrupter::InterruptThread(OSThread* thread) { |
| if (FLAG_trace_thread_interrupter) { |
| OS::PrintErr("ThreadInterrupter interrupting %p\n", thread->id()); |
| } |
| int result = pthread_kill(thread->id(), SIGPROF); |
| ASSERT((result == 0) || (result == ESRCH)); |
| } |
| |
| void ThreadInterrupter::InstallSignalHandler() { |
| SignalHandler::Install< |
| ThreadInterrupterMacOS::ThreadInterruptSignalHandler>(); |
| } |
| |
| void ThreadInterrupter::RemoveSignalHandler() { |
| SignalHandler::Remove(); |
| } |
| |
| #endif // !PRODUCT |
| |
| } // namespace dart |
| |
| #endif // defined(HOST_OS_MACOS) |