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// 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)