win: Add implementation of system_snapshot for Windows

snapshot/win/system_snapshot_win.cc

Index: snapshot/win/system_snapshot_win.cc
diff --git a/snapshot/win/system_snapshot_win.cc b/snapshot/win/system_snapshot_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5e24211a2ddb27cb70249dd2df0d0dca715051ed
--- /dev/null
+++ b/snapshot/win/system_snapshot_win.cc
@@ -0,0 +1,356 @@
+// Copyright 2015 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "snapshot/win/system_snapshot_win.h"
+
+#include <intrin.h>
+#include <powrprof.h>
+#include <windows.h>
+#include <winnt.h>
+
+#include <algorithm>
+#include <utility>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+
+namespace crashpad {
+
+namespace {
+
+//! \brief Gets a string representation for a VS_FIXEDFILEINFO.dwFileFlags
+//!     value.
+std::string GetStringForFileFlags(uint32_t file_flags) {
+  std::string result;
+  DCHECK_EQ(file_flags & VS_FF_INFOINFERRED, 0u);
+  if (file_flags & VS_FF_DEBUG)
+    result += "Debug,";
+  if (file_flags & VS_FF_PATCHED)
+    result += "Patched,";
+  if (file_flags & VS_FF_PRERELEASE)
+    result += "Prerelease,";
+  if (file_flags & VS_FF_PRIVATEBUILD)
+    result += "Private,";
+  if (file_flags & VS_FF_SPECIALBUILD)
+    result += "Special,";
+  if (!result.empty())
+    return result.substr(0, result.size() - 1);  // Remove trailing comma.
+  return result;
+}
+
+//! \brief Gets a string representation for a VS_FIXEDFILEINFO.dwFileOS value.
+std::string GetStringForFileOS(uint32_t file_os) {
+  // There are a variety of ancient things this could theoretically be. In
+  // practice, we're always going to get VOS_NT_WINDOWS32 here.
+  if ((file_os & VOS_NT_WINDOWS32) == VOS_NT_WINDOWS32)
+    return "Windows NT";
+  else
+    return "Unknown";
+}
+
+}  // namespace
+
+namespace internal {
+
+SystemSnapshotWin::SystemSnapshotWin()
+    : SystemSnapshot(),
+      os_version_full_(),
+      os_version_build_(),
+      process_reader_(nullptr),
+      os_version_major_(0),
+      os_version_minor_(0),
+      os_version_bugfix_(0),
+      os_server_(false),
+      initialized_() {
+}
+
+SystemSnapshotWin::~SystemSnapshotWin() {
+}
+
+void SystemSnapshotWin::Initialize(ProcessReaderWin* process_reader) {
+  INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
+
+  process_reader_ = process_reader;
+
+  // We use both GetVersionEx and VerQueryValue. GetVersionEx is not trustworthy
+  // after Windows 8 (depending on the application manifest) so its data is used
+  // only to fill the os_server_ field, and the rest comes from the version
+  // information stamped on kernel32.dll.
+  OSVERSIONINFOEX version_info = {sizeof(version_info)};
+  if (!GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info))) {
+    PLOG(WARNING) << "GetVersionEx";
+  } else {
+    const wchar_t kSystemDll[] = L"kernel32.dll";
+    DWORD size = GetFileVersionInfoSize(kSystemDll, nullptr);
+    if (!size) {
+      PLOG(WARNING) << "GetFileVersionInfoSize";
+    } else {
+      scoped_ptr<uint8_t[]> data(new uint8_t[size]);
+      if (!GetFileVersionInfo(kSystemDll, 0, size, data.get())) {
+        PLOG(WARNING) << "GetFileVersionInfo";
+      } else {
+        VS_FIXEDFILEINFO* fixed_file_info;
+        UINT size;
+        if (!VerQueryValue(data.get(),
+                           L"\\",
+                           reinterpret_cast<void**>(&fixed_file_info),
+                           &size)) {
+          PLOG(WARNING) << "VerQueryValue";
+        } else {
+          uint32_t valid_flags =
+              fixed_file_info->dwFileFlags & fixed_file_info->dwFileFlagsMask;
+          std::string flags_string = GetStringForFileFlags(valid_flags);
+          os_version_major_ =
+              (fixed_file_info->dwFileVersionMS & 0xffff0000) >> 16;
+          os_version_minor_ = fixed_file_info->dwFileVersionMS & 0xffff;
+          os_version_bugfix_ =
+              (fixed_file_info->dwFileVersionLS & 0xffff0000) >> 16;
+          os_version_build_ = base::StringPrintf(
+              "%d", fixed_file_info->dwFileVersionLS & 0xffff);
+          os_server_ = version_info.wProductType != VER_NT_WORKSTATION;
+          std::string os_name = GetStringForFileOS(fixed_file_info->dwFileOS);
+          os_version_full_ = base::StringPrintf(
+              "%s %d.%d.%d.%s%s",
+              os_name.c_str(),
+              os_version_major_,
+              os_version_minor_,
+              os_version_bugfix_,
+              os_version_build_.c_str(),
+              flags_string.empty() ? "" : (std::string(" (") + flags_string +
+                                           ")").c_str());
+        }
+      }
+    }
+  }
+
+  INITIALIZATION_STATE_SET_VALID(initialized_);
+}
+
+CPUArchitecture SystemSnapshotWin::GetCPUArchitecture() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  return process_reader_->Is64Bit() ? kCPUArchitectureX86_64
+                                    : kCPUArchitectureX86;
+}
+
+uint32_t SystemSnapshotWin::CPURevision() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  uint32_t raw = CPUX86Signature();
+  uint8_t stepping = raw & 0xf;
+  uint8_t model = (raw & 0xf0) >> 4;
+  uint8_t family = (raw & 0xf00) >> 8;
+  uint8_t extended_model = static_cast<uint8_t>((raw & 0xf0000) >> 16);
+  uint16_t extended_family = (raw & 0xff00000) >> 20;
+
+  // For families before 15, extended_family are simply reserved bits.
+  if (family < 15)
+    extended_family = 0;
+  // extended_model is only used for families 6 and 15.
+  if (family != 6 && family != 15)
+    extended_model = 0;
+
+  uint16_t adjusted_family = family + extended_family;
+  uint8_t adjusted_model = model + (extended_model << 4);
+  return (adjusted_family << 16) | (adjusted_model << 8) | stepping;
+}
+
+uint8_t SystemSnapshotWin::CPUCount() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  SYSTEM_INFO system_info;
+  GetSystemInfo(&system_info);
+  if (!base::IsValueInRangeForNumericType<uint8_t>(
+          system_info.dwNumberOfProcessors)) {
+    LOG(WARNING) << "dwNumberOfProcessors exceeds uint8_t storage";
+  }
+  return base::saturated_cast<uint8_t>(system_info.dwNumberOfProcessors);
+}
+
+std::string SystemSnapshotWin::CPUVendor() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int cpu_info[4];
+  __cpuid(cpu_info, 0);
+  char vendor[12];
+  *reinterpret_cast<int*>(vendor) = cpu_info[1];
+  *reinterpret_cast<int*>(vendor + 4) = cpu_info[3];
+  *reinterpret_cast<int*>(vendor + 8) = cpu_info[2];
+  return std::string(vendor, sizeof(vendor));
+}
+
+void SystemSnapshotWin::CPUFrequency(uint64_t* current_hz,
+                                     uint64_t* max_hz) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int num_cpus = CPUCount();
+  DCHECK_GT(num_cpus, 0);
+  std::vector<PROCESSOR_POWER_INFORMATION> info(num_cpus);
+  if (CallNtPowerInformation(ProcessorInformation,
+                             nullptr,
+                             0,
+                             &info[0],
+                             sizeof(PROCESSOR_POWER_INFORMATION) * num_cpus) !=
+      0) {
+    *current_hz = 0;
+    *max_hz = 0;
+    return;
+  }
+  const uint64_t kMhzToHz = static_cast<uint64_t>(1E6);
+  *current_hz = std::max_element(info.begin(),
+                                 info.end(),
+                                 [](const PROCESSOR_POWER_INFORMATION& a,
+                                    const PROCESSOR_POWER_INFORMATION& b) {
+                                   return a.CurrentMhz < b.CurrentMhz;
+                                 })->CurrentMhz *
+                kMhzToHz;
+  *max_hz = std::max_element(info.begin(),
+                             info.end(),
+                             [](const PROCESSOR_POWER_INFORMATION& a,
+                                const PROCESSOR_POWER_INFORMATION& b) {
+                               return a.MaxMhz < b.MaxMhz;
+                             })->MaxMhz *
+            kMhzToHz;
+}
+
+uint32_t SystemSnapshotWin::CPUX86Signature() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int cpu_info[4];
+  // We will never run on any processors that don't support at least function 1.
+  __cpuid(cpu_info, 1);
+  return cpu_info[0];
+}
+
+uint64_t SystemSnapshotWin::CPUX86Features() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int cpu_info[4];
+  // We will never run on any processors that don't support at least function 1.
+  __cpuid(cpu_info, 1);
+  return (static_cast<uint64_t>(cpu_info[2]) << 32) |
+         static_cast<uint64_t>(cpu_info[3]);
+}
+
+uint64_t SystemSnapshotWin::CPUX86ExtendedFeatures() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int cpu_info[4];
+  // We will never run on any processors that don't support at least extended
+  // function 1.
+  __cpuid(cpu_info, 0x80000001);
+  return (static_cast<uint64_t>(cpu_info[2]) << 32) |
+         static_cast<uint64_t>(cpu_info[3]);
+}
+
+uint32_t SystemSnapshotWin::CPUX86Leaf7Features() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  int cpu_info[4];
+
+  // Make sure leaf 7 can be called.
+  __cpuid(cpu_info, 0);
+  if (cpu_info[0] < 7)
+    return 0;
+
+  __cpuidex(cpu_info, 7, 0);
+  return cpu_info[1];
+}
+
+bool SystemSnapshotWin::CPUX86SupportsDAZ() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+
+  // The correct way to check for denormals-as-zeros (DAZ) support is to examine
+  // mxcsr mask, which can be done with fxsave. See Intel Software Developer's
+  // Manual, Volume 1: Basic Architecture (253665-051), 11.6.3 "Checking for the
+  // DAZ Flag in the MXCSR Register". Note that since this function tests for
+  // DAZ support in the CPU, it checks the mxcsr mask. Testing mxcsr would
+  // indicate whether DAZ is actually enabled, which is a per-thread context
+  // concern.
+
+  // Test for fxsave support.
+  uint64_t features = CPUX86Features();
+  if (!(features & (UINT64_C(1) << 24))) {
+    return false;
+  }
+
+  // Call fxsave.
+  __declspec(align(16)) uint32_t extended_registers[128];
+  _fxsave(&extended_registers);
+  uint32_t mxcsr_mask = extended_registers[7];
+
+  // Test the DAZ bit.
+  return mxcsr_mask & (1 << 6);
+}
+
+SystemSnapshot::OperatingSystem SystemSnapshotWin::GetOperatingSystem() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return kOperatingSystemWindows;
+}
+
+bool SystemSnapshotWin::OSServer() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return os_server_;
+}
+
+void SystemSnapshotWin::OSVersion(int* major,
+                                  int* minor,
+                                  int* bugfix,
+                                  std::string* build) const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  *major = os_version_major_;
+  *minor = os_version_minor_;
+  *bugfix = os_version_bugfix_;
+  build->assign(os_version_build_);
+}
+
+std::string SystemSnapshotWin::OSVersionFull() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return os_version_full_;
+}
+
+std::string SystemSnapshotWin::MachineDescription() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  // TODO(scottmg): Not sure if there's anything sensible to put here.
+  return std::string();
+}
+
+bool SystemSnapshotWin::NXEnabled() const {
+  INITIALIZATION_STATE_DCHECK_VALID(initialized_);
+  return IsProcessorFeaturePresent(PF_NX_ENABLED);
+}
+
+void SystemSnapshotWin::TimeZone(DaylightSavingTimeStatus* dst_status,
+                                 int* standard_offset_seconds,
+                                 int* daylight_offset_seconds,
+                                 std::string* standard_name,
+                                 std::string* daylight_name) const {
+  // This returns the current time zone status rather than the status at the
+  // time of the snapshot. This differs from the Mac implementation.
+  TIME_ZONE_INFORMATION time_zone_information;
+  *dst_status = static_cast<DaylightSavingTimeStatus>(
+      GetTimeZoneInformation(&time_zone_information));
+  *standard_offset_seconds =
+      (time_zone_information.Bias + time_zone_information.StandardBias) * -60;
+  *daylight_offset_seconds =
+      (time_zone_information.Bias + time_zone_information.DaylightBias) * -60;
+  *standard_name = base::UTF16ToUTF8(time_zone_information.StandardName);
+  *daylight_name = base::UTF16ToUTF8(time_zone_information.DaylightName);
+}
+
+}  // namespace internal
+}  // namespace crashpad