Move *BSD and Solaris Sampler implementations into sampler.cc

src/platform-linux.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 50 matching lines @@
     defined(__arm__) && !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT)
 #include <asm/sigcontext.h>
 #endif
 
 #undef MAP_TYPE
 
 #include "v8.h"
 
 #include "platform-posix.h"
 #include "platform.h"
-#include "simulator.h"
 #include "v8threads.h"
 #include "vm-state-inl.h"
 
 
 namespace v8 {
 namespace internal {
 
 // 0 is never a valid thread id on Linux since tids and pids share a
 // name space and pid 0 is reserved (see man 2 kill).
 static const pthread_t kNoThread = (pthread_t) 0;
@@ skipping 903 matching lines @@
     CHECK(result == -1 && errno == EINTR);  // Signal caused spurious wakeup.
   }
 }
 
 
 Semaphore* OS::CreateSemaphore(int count) {
   return new LinuxSemaphore(count);
 }
 
 
-#if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T)
-
-// Not all versions of Android's C library provide ucontext_t.
-// Detect this and provide custom but compatible definitions. Note that these
-// follow the GLibc naming convention to access register values from
-// mcontext_t.
-//
-// See http://code.google.com/p/android/issues/detail?id=34784
-
-#if defined(__arm__)
-
-typedef struct sigcontext mcontext_t;
-
-typedef struct ucontext {
-  uint32_t uc_flags;
-  struct ucontext* uc_link;
-  stack_t uc_stack;
-  mcontext_t uc_mcontext;
-  // Other fields are not used by V8, don't define them here.
-} ucontext_t;
-
-#elif defined(__mips__)
-// MIPS version of sigcontext, for Android bionic.
-typedef struct {
-  uint32_t regmask;
-  uint32_t status;
-  uint64_t pc;
-  uint64_t gregs[32];
-  uint64_t fpregs[32];
-  uint32_t acx;
-  uint32_t fpc_csr;
-  uint32_t fpc_eir;
-  uint32_t used_math;
-  uint32_t dsp;
-  uint64_t mdhi;
-  uint64_t mdlo;
-  uint32_t hi1;
-  uint32_t lo1;
-  uint32_t hi2;
-  uint32_t lo2;
-  uint32_t hi3;
-  uint32_t lo3;
-} mcontext_t;
-
-typedef struct ucontext {
-  uint32_t uc_flags;
-  struct ucontext* uc_link;
-  stack_t uc_stack;
-  mcontext_t uc_mcontext;
-  // Other fields are not used by V8, don't define them here.
-} ucontext_t;
-
-#elif defined(__i386__)
-// x86 version for Android.
-typedef struct {
-  uint32_t gregs[19];
-  void* fpregs;
-  uint32_t oldmask;
-  uint32_t cr2;
-} mcontext_t;
-
-typedef uint32_t kernel_sigset_t[2];  // x86 kernel uses 64-bit signal masks
-typedef struct ucontext {
-  uint32_t uc_flags;
-  struct ucontext* uc_link;
-  stack_t uc_stack;
-  mcontext_t uc_mcontext;
-  // Other fields are not used by V8, don't define them here.
-} ucontext_t;
-enum { REG_EBP = 6, REG_ESP = 7, REG_EIP = 14 };
-#endif
-
-#endif  // __ANDROID__ && !defined(__BIONIC_HAVE_UCONTEXT_T)
-
-static int GetThreadID() {
-#if defined(__ANDROID__)
-  // Android's C library provides gettid(2).
-  return gettid();
-#else
-  // Glibc doesn't provide a wrapper for gettid(2).
-  return syscall(SYS_gettid);
-#endif
-}
-
-
-class Sampler::PlatformData : public Malloced {
- public:
-  PlatformData()
-      : vm_tid_(GetThreadID()),
-        profiled_thread_id_(ThreadId::Current()) {}
-
-  pthread_t vm_tid() const { return vm_tid_; }
-  ThreadId profiled_thread_id() { return profiled_thread_id_; }
-
- private:
-  pthread_t vm_tid_;
-  ThreadId profiled_thread_id_;
-};
-
-
-static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
-#if defined(__native_client__)
-  // As Native Client does not support signal handling, profiling
-  // is disabled.
-  return;
-#else
-  USE(info);
-  if (signal != SIGPROF) return;
-  Isolate* isolate = Isolate::UncheckedCurrent();
-  if (isolate == NULL || !isolate->IsInitialized() || !isolate->IsInUse()) {
-    // We require a fully initialized and entered isolate.
-    return;
-  }
-  if (v8::Locker::IsActive() &&
-      !isolate->thread_manager()->IsLockedByCurrentThread()) {
-    return;
-  }
-
-  Sampler* sampler = isolate->logger()->sampler();
-  if (sampler == NULL || !sampler->IsActive()) return;
-
-#if defined(USE_SIMULATOR)
-#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_MIPS
-  ThreadId thread_id = sampler->platform_data()->profiled_thread_id();
-  Isolate::PerIsolateThreadData* per_thread_data = isolate->
-      FindPerThreadDataForThread(thread_id);
-  if (!per_thread_data) return;
-  Simulator* sim = per_thread_data->simulator();
-  // Check if there is active simulator before allocating TickSample.
-  if (!sim) return;
-#endif
-#endif  // USE_SIMULATOR
-
-  TickSample sample_obj;
-  TickSample* sample = isolate->cpu_profiler()->TickSampleEvent();
-  if (sample == NULL) sample = &sample_obj;
-
-#if defined(USE_SIMULATOR)
-#if V8_TARGET_ARCH_ARM
-  sample->pc = reinterpret_cast<Address>(sim->get_register(Simulator::pc));
-  sample->sp = reinterpret_cast<Address>(sim->get_register(Simulator::sp));
-  sample->fp = reinterpret_cast<Address>(sim->get_register(Simulator::r11));
-#elif V8_TARGET_ARCH_MIPS
-  sample->pc = reinterpret_cast<Address>(sim->get_register(Simulator::pc));
-  sample->sp = reinterpret_cast<Address>(sim->get_register(Simulator::sp));
-  sample->fp = reinterpret_cast<Address>(sim->get_register(Simulator::fp));
-#endif
-#else
-  // Extracting the sample from the context is extremely machine dependent.
-  ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
-  mcontext_t& mcontext = ucontext->uc_mcontext;
-  sample->state = isolate->current_vm_state();
-#if V8_HOST_ARCH_IA32
-  sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]);
-  sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]);
-  sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]);
-#elif V8_HOST_ARCH_X64
-  sample->pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]);
-  sample->sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]);
-  sample->fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]);
-#elif V8_HOST_ARCH_ARM
-#if defined(__GLIBC__) && !defined(__UCLIBC__) && \
-    (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
-  // Old GLibc ARM versions used a gregs[] array to access the register
-  // values from mcontext_t.
-  sample->pc = reinterpret_cast<Address>(mcontext.gregs[R15]);
-  sample->sp = reinterpret_cast<Address>(mcontext.gregs[R13]);
-  sample->fp = reinterpret_cast<Address>(mcontext.gregs[R11]);
-#else
-  sample->pc = reinterpret_cast<Address>(mcontext.arm_pc);
-  sample->sp = reinterpret_cast<Address>(mcontext.arm_sp);
-  sample->fp = reinterpret_cast<Address>(mcontext.arm_fp);
-#endif  // defined(__GLIBC__) && !defined(__UCLIBC__) &&
-        // (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
-#elif V8_HOST_ARCH_MIPS
-  sample->pc = reinterpret_cast<Address>(mcontext.pc);
-  sample->sp = reinterpret_cast<Address>(mcontext.gregs[29]);
-  sample->fp = reinterpret_cast<Address>(mcontext.gregs[30]);
-#endif  // V8_HOST_ARCH_*
-#endif  // USE_SIMULATOR
-  sampler->SampleStack(sample);
-  sampler->Tick(sample);
-#endif  // __native_client__
-}
-
-
-class SignalSender : public Thread {
- public:
-  static const int kSignalSenderStackSize = 64 * KB;
-
-  explicit SignalSender(int interval)
-      : Thread(Thread::Options("SignalSender", kSignalSenderStackSize)),
-        vm_tgid_(getpid()),
-        interval_(interval) {}
-
-  static void SetUp() { if (!mutex_) mutex_ = OS::CreateMutex(); }
-  static void TearDown() { delete mutex_; }
-
-  static void InstallSignalHandler() {
-    struct sigaction sa;
-    sa.sa_sigaction = ProfilerSignalHandler;
-    sigemptyset(&sa.sa_mask);
-    sa.sa_flags = SA_RESTART | SA_SIGINFO;
-    signal_handler_installed_ =
-        (sigaction(SIGPROF, &sa, &old_signal_handler_) == 0);
-  }
-
-  static void RestoreSignalHandler() {
-    if (signal_handler_installed_) {
-      sigaction(SIGPROF, &old_signal_handler_, 0);
-      signal_handler_installed_ = false;
-    }
-  }
-
-  static void AddActiveSampler(Sampler* sampler) {
-    ScopedLock lock(mutex_);
-    SamplerRegistry::AddActiveSampler(sampler);
-    if (instance_ == NULL) {
-      // Start a thread that will send SIGPROF signal to VM threads,
-      // when CPU profiling will be enabled.
-      instance_ = new SignalSender(sampler->interval());
-      instance_->StartSynchronously();
-    } else {
-      ASSERT(instance_->interval_ == sampler->interval());
-    }
-  }
-
-  static void RemoveActiveSampler(Sampler* sampler) {
-    ScopedLock lock(mutex_);
-    SamplerRegistry::RemoveActiveSampler(sampler);
-    if (SamplerRegistry::GetState() == SamplerRegistry::HAS_NO_SAMPLERS) {
-      instance_->Join();
-      delete instance_;
-      instance_ = NULL;
-      RestoreSignalHandler();
-    }
-  }
-
-  // Implement Thread::Run().
-  virtual void Run() {
-    SamplerRegistry::State state;
-    while ((state = SamplerRegistry::GetState()) !=
-           SamplerRegistry::HAS_NO_SAMPLERS) {
-      // When CPU profiling is enabled both JavaScript and C++ code is
-      // profiled. We must not suspend.
-      if (state == SamplerRegistry::HAS_CPU_PROFILING_SAMPLERS) {
-        if (!signal_handler_installed_) InstallSignalHandler();
-        SamplerRegistry::IterateActiveSamplers(&DoCpuProfile, this);
-      } else {
-        if (signal_handler_installed_) RestoreSignalHandler();
-      }
-      Sleep();  // TODO(svenpanne) Figure out if OS:Sleep(interval_) is enough.
-    }
-  }
-
-  static void DoCpuProfile(Sampler* sampler, void* raw_sender) {
-    if (!sampler->IsProfiling()) return;
-    SignalSender* sender = reinterpret_cast<SignalSender*>(raw_sender);
-    sender->SendProfilingSignal(sampler->platform_data()->vm_tid());
-  }
-
-  void SendProfilingSignal(int tid) {
-    if (!signal_handler_installed_) return;
-    // Glibc doesn't provide a wrapper for tgkill(2).
-#if defined(ANDROID)
-    syscall(__NR_tgkill, vm_tgid_, tid, SIGPROF);
-#else
-    int result = syscall(SYS_tgkill, vm_tgid_, tid, SIGPROF);
-    USE(result);
-    ASSERT(result == 0);
-#endif
-  }
-
-  void Sleep() {
-    // Convert ms to us and subtract 100 us to compensate delays
-    // occuring during signal delivery.
-    useconds_t interval = interval_ * 1000 - 100;
-#if defined(ANDROID)
-    usleep(interval);
-#else
-    int result = usleep(interval);
-#ifdef DEBUG
-    if (result != 0 && errno != EINTR) {
-      fprintf(stderr,
-              "SignalSender usleep error; interval = %u, errno = %d\n",
-              interval,
-              errno);
-      ASSERT(result == 0 || errno == EINTR);
-    }
-#endif  // DEBUG
-    USE(result);
-#endif  // ANDROID
-  }
-
-  const int vm_tgid_;
-  const int interval_;
-
-  // Protects the process wide state below.
-  static Mutex* mutex_;
-  static SignalSender* instance_;
-  static bool signal_handler_installed_;
-  static struct sigaction old_signal_handler_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SignalSender);
-};
-
-
-Mutex* SignalSender::mutex_ = NULL;
-SignalSender* SignalSender::instance_ = NULL;
-struct sigaction SignalSender::old_signal_handler_;
-bool SignalSender::signal_handler_installed_ = false;
-
-
 void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
   limit_mutex = CreateMutex();
 
 #ifdef __arm__
   // When running on ARM hardware check that the EABI used by V8 and
   // by the C code is the same.
   bool hard_float = OS::ArmUsingHardFloat();
   if (hard_float) {
 #if !USE_EABI_HARDFLOAT
     PrintF("ERROR: Binary compiled with -mfloat-abi=hard but without "
            "-DUSE_EABI_HARDFLOAT\n");
     exit(1);
 #endif
   } else {
 #if USE_EABI_HARDFLOAT
     PrintF("ERROR: Binary not compiled with -mfloat-abi=hard but with "
            "-DUSE_EABI_HARDFLOAT\n");
     exit(1);
 #endif
   }
 #endif
-  SignalSender::SetUp();
 }
 
 
 void OS::TearDown() {
-  SignalSender::TearDown();
   delete limit_mutex;
 }
 
 
-Sampler::Sampler(Isolate* isolate, int interval)
-    : isolate_(isolate),
-      interval_(interval),
-      profiling_(false),
-      active_(false),
-      samples_taken_(0) {
-  data_ = new PlatformData;
-}
-
-
-Sampler::~Sampler() {
-  ASSERT(!IsActive());
-  delete data_;
-}
-
-
-void Sampler::Start() {
-  ASSERT(!IsActive());
-  SetActive(true);
-  SignalSender::AddActiveSampler(this);
-}
-
-
-void Sampler::Stop() {
-  ASSERT(IsActive());
-  SignalSender::RemoveActiveSampler(this);
-  SetActive(false);
-}
-
-
 } }  // namespace v8::internal