File: platform-win32.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: */
// Copyright (c) 2006-2011 The Chromium 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 with the
//    distribution.
//  * Neither the name of Google, Inc. nor the names of its contributors
//    may be used to endorse or promote products derived from this
//    software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.

#include <windows.h>
#include <mmsystem.h>
#include <process.h>

#ifdef __MINGW32__
#include <immintrin.h>  // for _mm_pause
#endif

#include "nsWindowsDllInterceptor.h"
#include "mozilla/StackWalk_windows.h"
#include "mozilla/WindowsVersion.h"

/* static */ int Thread::GetCurrentId() {
  DWORD threadId = GetCurrentThreadId();
  MOZ_ASSERT(threadId <= INT32_MAX, "native thread ID is > INT32_MAX");
  return int(threadId);
}

void* GetStackTop(void* aGuess) {
  PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
  return reinterpret_cast<void*>(pTib->StackBase);
}

static void PopulateRegsFromContext(Registers& aRegs, CONTEXT* aContext) {
#if defined(GP_ARCH_amd64)
  aRegs.mPC = reinterpret_cast<Address>(aContext->Rip);
  aRegs.mSP = reinterpret_cast<Address>(aContext->Rsp);
  aRegs.mFP = reinterpret_cast<Address>(aContext->Rbp);
#elif defined(GP_ARCH_x86)
  aRegs.mPC = reinterpret_cast<Address>(aContext->Eip);
  aRegs.mSP = reinterpret_cast<Address>(aContext->Esp);
  aRegs.mFP = reinterpret_cast<Address>(aContext->Ebp);
#else
#error "bad arch"
#endif
  aRegs.mLR = 0;
}

class PlatformData {
 public:
  // Get a handle to the calling thread. This is the thread that we are
  // going to profile. We need to make a copy of the handle because we are
  // going to use it in the sampler thread. Using GetThreadHandle() will
  // not work in this case. We're using OpenThread because DuplicateHandle
  // for some reason doesn't work in Chrome's sandbox.
  explicit PlatformData(int aThreadId)
      : mProfiledThread(OpenThread(THREAD_GET_CONTEXT | THREAD_SUSPEND_RESUME |
                                       THREAD_QUERY_INFORMATION,
                                   false, aThreadId)) {
    MOZ_COUNT_CTOR(PlatformData);
  }

  ~PlatformData() {
    if (mProfiledThread != nullptr) {
      CloseHandle(mProfiledThread);
      mProfiledThread = nullptr;
    }
    MOZ_COUNT_DTOR(PlatformData);
  }

  HANDLE ProfiledThread() { return mProfiledThread; }

 private:
  HANDLE mProfiledThread;
};

HANDLE
GetThreadHandle(PlatformData* aData) { return aData->ProfiledThread(); }

static const HANDLE kNoThread = INVALID_HANDLE_VALUE;

////////////////////////////////////////////////////////////////////////
// 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 Func& aProcessRegs) {
  HANDLE profiled_thread =
      aRegisteredThread.GetPlatformData()->ProfiledThread();
  if (profiled_thread == nullptr) {
    return;
  }

  // Context used for sampling the register state of the profiled thread.
  CONTEXT context;
  memset(&context, 0, sizeof(context));

  //----------------------------------------------------------------//
  // Suspend the samplee thread and get its context.

  static const DWORD kSuspendFailed = static_cast<DWORD>(-1);
  if (SuspendThread(profiled_thread) == kSuspendFailed) {
    return;
  }

    // SuspendThread is asynchronous, so the thread may still be running.
    // Call GetThreadContext first to ensure the thread is really suspended.
    // See https://blogs.msdn.microsoft.com/oldnewthing/20150205-00/?p=44743.

    // Using only CONTEXT_CONTROL is faster but on 64-bit it causes crashes in
    // RtlVirtualUnwind (see bug 1120126) so we set all the flags.
#if defined(GP_ARCH_amd64)
  context.ContextFlags = CONTEXT_FULL;
#else
  context.ContextFlags = CONTEXT_CONTROL;
#endif
  if (!GetThreadContext(profiled_thread, &context)) {
    ResumeThread(profiled_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.

  Registers regs;
  PopulateRegsFromContext(regs, &context);
  aProcessRegs(regs);

  //----------------------------------------------------------------//
  // Resume the target thread.

  ResumeThread(profiled_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 unsigned int __stdcall ThreadEntry(void* aArg) {
  auto thread = static_cast<SamplerThread*>(aArg);
  thread->Run();
  return 0;
}

SamplerThread::SamplerThread(PSLockRef aLock, uint32_t aActivityGeneration,
                             double aIntervalMilliseconds)
    : Sampler(aLock),
      mActivityGeneration(aActivityGeneration),
      mIntervalMicroseconds(
          std::max(1, int(floor(aIntervalMilliseconds * 1000 + 0.5)))) {
  // By default we'll not adjust the timer resolution which tends to be
  // around 16ms. However, if the requested interval is sufficiently low
  // we'll try to adjust the resolution to match.
  if (mIntervalMicroseconds < 10 * 1000) {
    ::timeBeginPeriod(mIntervalMicroseconds / 1000);
  }

  // Create a new thread. It is important to use _beginthreadex() instead of
  // the Win32 function CreateThread(), because the CreateThread() does not
  // initialize thread-specific structures in the C runtime library.
  mThread = reinterpret_cast<HANDLE>(_beginthreadex(nullptr,
                                                    /* stack_size */ 0,
                                                    ThreadEntry, this,
                                                    /* initflag */ 0, nullptr));
  if (mThread == 0) {
    MOZ_CRASH("_beginthreadex failed");
  }
}

SamplerThread::~SamplerThread() {
  WaitForSingleObject(mThread, INFINITE);

  // Close our own handle for the thread.
  if (mThread != kNoThread) {
    CloseHandle(mThread);
  }
}

void SamplerThread::SleepMicro(uint32_t aMicroseconds) {
  // For now, keep the old behaviour of minimum Sleep(1), even for
  // smaller-than-usual sleeps after an overshoot, unless the user has
  // explicitly opted into a sub-millisecond profiler interval.
  if (mIntervalMicroseconds >= 1000) {
    ::Sleep(std::max(1u, aMicroseconds / 1000));
  } else {
    TimeStamp start = TimeStamp::Now();
    TimeStamp end = start + TimeDuration::FromMicroseconds(aMicroseconds);

    // First, sleep for as many whole milliseconds as possible.
    if (aMicroseconds >= 1000) {
      ::Sleep(aMicroseconds / 1000);
    }

    // Then, spin until enough time has passed.
    while (TimeStamp::Now() < end) {
      _mm_pause();
    }
  }
}

void SamplerThread::Stop(PSLockRef aLock) {
  // Disable any timer resolution changes we've made. Do it now while
  // gPSMutex is locked, i.e. before any other SamplerThread can be created
  // and call ::timeBeginPeriod().
  //
  // It's safe to do this now even though this SamplerThread is still alive,
  // because the next time the main loop of Run() iterates it won't get past
  // the mActivityGeneration check, and so it won't make any more ::Sleep()
  // calls.
  if (mIntervalMicroseconds < 10 * 1000) {
    ::timeEndPeriod(mIntervalMicroseconds / 1000);
  }

  Sampler::Disable(aLock);
}

// END SamplerThread target specifics
////////////////////////////////////////////////////////////////////////

static void PlatformInit(PSLockRef aLock) {}

#if defined(HAVE_NATIVE_UNWIND)
void Registers::SyncPopulate() {
  CONTEXT context;
  RtlCaptureContext(&context);
  PopulateRegsFromContext(*this, &context);
}
#endif

#if defined(GP_PLAT_amd64_windows)
static WindowsDllInterceptor NtDllIntercept;

typedef NTSTATUS(NTAPI* LdrUnloadDll_func)(HMODULE module);
static LdrUnloadDll_func stub_LdrUnloadDll;

static NTSTATUS NTAPI patched_LdrUnloadDll(HMODULE module) {
  // Prevent the stack walker from suspending this thread when LdrUnloadDll
  // holds the RtlLookupFunctionEntry lock.
  AutoSuppressStackWalking suppress;
  return stub_LdrUnloadDll(module);
}

// These pointers are disguised as PVOID to avoid pulling in obscure headers
typedef PVOID(WINAPI* LdrResolveDelayLoadedAPI_func)(
    PVOID ParentModuleBase, PVOID DelayloadDescriptor, PVOID FailureDllHook,
    PVOID FailureSystemHook, PVOID ThunkAddress, ULONG Flags);
static LdrResolveDelayLoadedAPI_func stub_LdrResolveDelayLoadedAPI;

static PVOID WINAPI patched_LdrResolveDelayLoadedAPI(
    PVOID ParentModuleBase, PVOID DelayloadDescriptor, PVOID FailureDllHook,
    PVOID FailureSystemHook, PVOID ThunkAddress, ULONG Flags) {
  // Prevent the stack walker from suspending this thread when
  // LdrResolveDelayLoadAPI holds the RtlLookupFunctionEntry lock.
  AutoSuppressStackWalking suppress;
  return stub_LdrResolveDelayLoadedAPI(ParentModuleBase, DelayloadDescriptor,
                                       FailureDllHook, FailureSystemHook,
                                       ThunkAddress, Flags);
}

void InitializeWin64ProfilerHooks() {
  static bool initialized = false;
  if (initialized) {
    return;
  }
  initialized = true;

  NtDllIntercept.Init("ntdll.dll");
  NtDllIntercept.AddHook("LdrUnloadDll",
                         reinterpret_cast<intptr_t>(patched_LdrUnloadDll),
                         (void**)&stub_LdrUnloadDll);
  if (IsWin8OrLater()) {  // LdrResolveDelayLoadedAPI was introduced in Win8
    NtDllIntercept.AddHook(
        "LdrResolveDelayLoadedAPI",
        reinterpret_cast<intptr_t>(patched_LdrResolveDelayLoadedAPI),
        (void**)&stub_LdrResolveDelayLoadedAPI);
  }
}
#endif  // defined(GP_PLAT_amd64_windows)