Remove the unused sampling profiler.

base/win/sampling_profiler.cc

Index: base/win/sampling_profiler.cc
diff --git a/base/win/sampling_profiler.cc b/base/win/sampling_profiler.cc
deleted file mode 100644
index 150452c447aefde8da10f71f145a3d3a21617af8..0000000000000000000000000000000000000000
--- a/base/win/sampling_profiler.cc
+++ /dev/null
@@ -1,238 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/win/sampling_profiler.h"
-
-#include <winternl.h>  // for NTSTATUS.
-
-#include "base/lazy_instance.h"
-
-// Copied from wdm.h in the WDK as we don't want to take
-// a dependency on the WDK.
-typedef enum _KPROFILE_SOURCE {
-    ProfileTime,
-    ProfileAlignmentFixup,
-    ProfileTotalIssues,
-    ProfilePipelineDry,
-    ProfileLoadInstructions,
-    ProfilePipelineFrozen,
-    ProfileBranchInstructions,
-    ProfileTotalNonissues,
-    ProfileDcacheMisses,
-    ProfileIcacheMisses,
-    ProfileCacheMisses,
-    ProfileBranchMispredictions,
-    ProfileStoreInstructions,
-    ProfileFpInstructions,
-    ProfileIntegerInstructions,
-    Profile2Issue,
-    Profile3Issue,
-    Profile4Issue,
-    ProfileSpecialInstructions,
-    ProfileTotalCycles,
-    ProfileIcacheIssues,
-    ProfileDcacheAccesses,
-    ProfileMemoryBarrierCycles,
-    ProfileLoadLinkedIssues,
-    ProfileMaximum
-} KPROFILE_SOURCE;
-
-
-namespace {
-
-// Signatures for the native functions we need to access the sampling profiler.
-typedef NTSTATUS (NTAPI *ZwSetIntervalProfileFunc)(ULONG, KPROFILE_SOURCE);
-typedef NTSTATUS (NTAPI *ZwQueryIntervalProfileFunc)(KPROFILE_SOURCE, PULONG);
-
-typedef NTSTATUS (NTAPI *ZwCreateProfileFunc)(PHANDLE profile,
-                                              HANDLE process,
-                                              PVOID code_start,
-                                              ULONG code_size,
-                                              ULONG eip_bucket_shift,
-                                              PULONG buckets,
-                                              ULONG buckets_byte_size,
-                                              KPROFILE_SOURCE source,
-                                              DWORD_PTR processor_mask);
-
-typedef NTSTATUS (NTAPI *ZwStartProfileFunc)(HANDLE);
-typedef NTSTATUS (NTAPI *ZwStopProfileFunc)(HANDLE);
-
-// This class is used to lazy-initialize pointers to the native
-// functions we need to access.
-class ProfilerFuncs {
- public:
-  ProfilerFuncs();
-
-  ZwSetIntervalProfileFunc ZwSetIntervalProfile;
-  ZwQueryIntervalProfileFunc ZwQueryIntervalProfile;
-  ZwCreateProfileFunc ZwCreateProfile;
-  ZwStartProfileFunc ZwStartProfile;
-  ZwStopProfileFunc ZwStopProfile;
-
-  // True iff all of the function pointers above were successfully initialized.
-  bool initialized_;
-};
-
-ProfilerFuncs::ProfilerFuncs()
-    : ZwSetIntervalProfile(NULL),
-      ZwQueryIntervalProfile(NULL),
-      ZwCreateProfile(NULL),
-      ZwStartProfile(NULL),
-      ZwStopProfile(NULL),
-      initialized_(false) {
-  HMODULE ntdll = ::GetModuleHandle(L"ntdll.dll");
-  if (ntdll != NULL) {
-    ZwSetIntervalProfile = reinterpret_cast<ZwSetIntervalProfileFunc>(
-        ::GetProcAddress(ntdll, "ZwSetIntervalProfile"));
-    ZwQueryIntervalProfile = reinterpret_cast<ZwQueryIntervalProfileFunc>(
-        ::GetProcAddress(ntdll, "ZwQueryIntervalProfile"));
-    ZwCreateProfile = reinterpret_cast<ZwCreateProfileFunc>(
-        ::GetProcAddress(ntdll, "ZwCreateProfile"));
-    ZwStartProfile = reinterpret_cast<ZwStartProfileFunc>(
-        ::GetProcAddress(ntdll, "ZwStartProfile"));
-    ZwStopProfile = reinterpret_cast<ZwStopProfileFunc>(
-        ::GetProcAddress(ntdll, "ZwStopProfile"));
-
-    if (ZwSetIntervalProfile &&
-        ZwQueryIntervalProfile &&
-        ZwCreateProfile &&
-        ZwStartProfile &&
-        ZwStopProfile) {
-      initialized_ = true;
-    }
-  }
-}
-
-base::LazyInstance<ProfilerFuncs>::Leaky funcs = LAZY_INSTANCE_INITIALIZER;
-
-}  // namespace
-
-
-namespace base {
-namespace win {
-
-SamplingProfiler::SamplingProfiler() : is_started_(false) {
-}
-
-SamplingProfiler::~SamplingProfiler() {
-  if (is_started_) {
-    CHECK(Stop()) <<
-        "Unable to stop sampling profiler, this will cause memory corruption.";
-  }
-}
-
-bool SamplingProfiler::Initialize(HANDLE process,
-                                  void* start,
-                                  size_t size,
-                                  size_t log2_bucket_size) {
-  // You only get to initialize each instance once.
-  DCHECK(!profile_handle_.IsValid());
-  DCHECK(!is_started_);
-  DCHECK(start != NULL);
-  DCHECK_NE(0U, size);
-  DCHECK_LE(2, log2_bucket_size);
-  DCHECK_GE(32, log2_bucket_size);
-
-  // Bail if the native functions weren't found.
-  if (!funcs.Get().initialized_)
-    return false;
-
-  size_t bucket_size = 1 << log2_bucket_size;
-  size_t num_buckets = (size + bucket_size - 1) / bucket_size;
-  DCHECK(num_buckets != 0);
-  buckets_.resize(num_buckets);
-
-  // Get our affinity mask for the call below.
-  DWORD_PTR process_affinity = 0;
-  DWORD_PTR system_affinity = 0;
-  if (!::GetProcessAffinityMask(process, &process_affinity, &system_affinity)) {
-    LOG(ERROR) << "Failed to get process affinity mask.";
-    return false;
-  }
-
-  HANDLE profile = NULL;
-  NTSTATUS status =
-      funcs.Get().ZwCreateProfile(&profile,
-                                  process,
-                                  start,
-                                  static_cast<ULONG>(size),
-                                  static_cast<ULONG>(log2_bucket_size),
-                                  &buckets_[0],
-                                  static_cast<ULONG>(
-                                      sizeof(buckets_[0]) * num_buckets),
-                                  ProfileTime,
-                                  process_affinity);
-
-  if (!NT_SUCCESS(status)) {
-    // Might as well deallocate the buckets.
-    buckets_.resize(0);
-    LOG(ERROR) << "Failed to create profile, error 0x" << std::hex << status;
-    return false;
-  }
-
-  DCHECK(profile != NULL);
-  profile_handle_.Set(profile);
-
-  return true;
-}
-
-bool SamplingProfiler::Start() {
-  DCHECK(profile_handle_.IsValid());
-  DCHECK(!is_started_);
-  DCHECK(funcs.Get().initialized_);
-
-  NTSTATUS status = funcs.Get().ZwStartProfile(profile_handle_.Get());
-  if (!NT_SUCCESS(status))
-    return false;
-
-  is_started_ = true;
-
-  return true;
-}
-
-bool SamplingProfiler::Stop() {
-  DCHECK(profile_handle_.IsValid());
-  DCHECK(is_started_);
-  DCHECK(funcs.Get().initialized_);
-
-  NTSTATUS status = funcs.Get().ZwStopProfile(profile_handle_.Get());
-  if (!NT_SUCCESS(status))
-    return false;
-  is_started_ = false;
-
-  return true;
-}
-
-bool SamplingProfiler::SetSamplingInterval(base::TimeDelta sampling_interval) {
-  if (!funcs.Get().initialized_)
-    return false;
-
-  // According to Nebbet, the sampling interval is in units of 100ns.
-  ULONG interval = sampling_interval.InMicroseconds() * 10;
-  NTSTATUS status = funcs.Get().ZwSetIntervalProfile(interval, ProfileTime);
-  if (!NT_SUCCESS(status))
-    return false;
-
-  return true;
-}
-
-bool SamplingProfiler::GetSamplingInterval(base::TimeDelta* sampling_interval) {
-  DCHECK(sampling_interval != NULL);
-
-  if (!funcs.Get().initialized_)
-    return false;
-
-  ULONG interval = 0;
-  NTSTATUS status = funcs.Get().ZwQueryIntervalProfile(ProfileTime, &interval);
-  if (!NT_SUCCESS(status))
-    return false;
-
-  // According to Nebbet, the sampling interval is in units of 100ns.
-  *sampling_interval = base::TimeDelta::FromMicroseconds(interval / 10);
-
-  return true;
-}
-
-}  // namespace win
-}  // namespace base