Move SystemInfo to rtc_base_approved and delete unused code.

webrtc/base/systeminfo.cc

 /*
  *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/base/systeminfo.h"
 
 #if defined(WEBRTC_WIN)
 #include <winsock2.h>
+#include <windows.h>
 #ifndef EXCLUDE_D3D9
 #include <d3d9.h>
 #endif
 #include <intrin.h>  // for __cpuid()
 #elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreServices/CoreServices.h>
 #elif defined(WEBRTC_LINUX)
 #include <unistd.h>
 #endif
 #if defined(WEBRTC_MAC)
 #include <sys/sysctl.h>
 #endif
 
-#if defined(WEBRTC_WIN)
-#include "webrtc/base/scoped_ptr.h"
-#include "webrtc/base/win32.h"
-#elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
-#include "webrtc/base/macconversion.h"
-#elif defined(WEBRTC_LINUX)
-#include "webrtc/base/linux.h"
-#endif
 #include "webrtc/base/common.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/stringutils.h"
 
 namespace rtc {
 
 // See Also: http://msdn.microsoft.com/en-us/library/ms683194(v=vs.85).aspx
-#if defined(WEBRTC_WIN)
-typedef BOOL (WINAPI *LPFN_GLPI)(
-    PSYSTEM_LOGICAL_PROCESSOR_INFORMATION,
-    PDWORD);
-
-static void GetProcessorInformation(int* physical_cpus, int* cache_size) {
-  // GetLogicalProcessorInformation() is available on Windows XP SP3 and beyond.
-  LPFN_GLPI glpi = reinterpret_cast<LPFN_GLPI>(GetProcAddress(
-      GetModuleHandle(L"kernel32"),
-      "GetLogicalProcessorInformation"));
-  if (NULL == glpi) {
-    return;
-  }
-  // Determine buffer size, allocate and get processor information.
-  // Size can change between calls (unlikely), so a loop is done.
-  DWORD return_length = 0;
-  scoped_ptr<SYSTEM_LOGICAL_PROCESSOR_INFORMATION[]> infos;
-  while (!glpi(infos.get(), &return_length)) {
-    if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
-      infos.reset(new SYSTEM_LOGICAL_PROCESSOR_INFORMATION[
-          return_length / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION)]);
-    } else {
-      return;
-    }
-  }
-  *physical_cpus = 0;
-  *cache_size = 0;
-  for (size_t i = 0;
-      i < return_length / sizeof(SYSTEM_LOGICAL_PROCESSOR_INFORMATION); ++i) {
-    if (infos[i].Relationship == RelationProcessorCore) {
-      ++*physical_cpus;
-    } else if (infos[i].Relationship == RelationCache) {
-      int next_cache_size = static_cast<int>(infos[i].Cache.Size);
-      if (next_cache_size >= *cache_size) {
-        *cache_size = next_cache_size;
-      }
-    }
-  }
-  return;
-}
-#else
+#if !defined(WEBRTC_WIN)
 // TODO(fbarchard): Use gcc 4.4 provided cpuid intrinsic
 // 32 bit fpic requires ebx be preserved
 #if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
 static inline void __cpuid(int cpu_info[4], int info_type) {
   __asm__ volatile (  // NOLINT
     "mov %%ebx, %%edi\n"
     "cpuid\n"
     "xchg %%edi, %%ebx\n"
     : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     : "a"(info_type)
   );  // NOLINT
 }
 #elif defined(__i386__) || defined(__x86_64__)
 static inline void __cpuid(int cpu_info[4], int info_type) {
   __asm__ volatile (  // NOLINT
     "cpuid\n"
     : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
     : "a"(info_type)
   );  // NOLINT
 }
 #endif
-#endif  // WEBRTC_WIN 
+#endif  // WEBRTC_WIN
 
-// Note(fbarchard):
-// Family and model are extended family and extended model.  8 bits each.
-SystemInfo::SystemInfo()
-    : physical_cpus_(1), logical_cpus_(1), cache_size_(0),
-      cpu_family_(0), cpu_model_(0), cpu_stepping_(0),
-      cpu_speed_(0), memory_(0) {
-  // Initialize the basic information.
-#if defined(__arm__) || defined(_M_ARM)
-  cpu_arch_ = SI_ARCH_ARM;
-#elif defined(__x86_64__) || defined(_M_X64)
-  cpu_arch_ = SI_ARCH_X64;
-#elif defined(__i386__) || defined(_M_IX86)
-  cpu_arch_ = SI_ARCH_X86;
-#else
-  cpu_arch_ = SI_ARCH_UNKNOWN;
-#endif
+static int DetectNumberOfCores() {
+  // We fall back on assuming a single core in case of errors.
+  int number_of_cores = 1;
 
 #if defined(WEBRTC_WIN)
   SYSTEM_INFO si;
   GetSystemInfo(&si);
-  logical_cpus_ = si.dwNumberOfProcessors;
-  GetProcessorInformation(&physical_cpus_, &cache_size_);
-  if (physical_cpus_ <= 0) {
-    physical_cpus_ = logical_cpus_;
+  number_of_cores = static_cast<int>(si.dwNumberOfProcessors);
+#elif defined(WEBRTC_LINUX) || defined(WEBRTC_ANDROID)
+  number_of_cores = static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
+#elif defined(WEBRTC_MAC)
+  int name[] = {CTL_HW, HW_AVAILCPU};
+  size_t size = sizeof(number_of_cores);
+  if (0 != sysctl(name, 2, &number_of_cores, &size, NULL, 0)) {
+    LOG(LS_ERROR) << "Failed to get number of cores";
+    number_of_cores = 1;
   }
-  cpu_family_ = si.wProcessorLevel;
-  cpu_model_ = si.wProcessorRevision >> 8;
-  cpu_stepping_ = si.wProcessorRevision & 0xFF;
-#elif defined(WEBRTC_MAC)
-  uint32_t sysctl_value;
-  size_t length = sizeof(sysctl_value);
-  if (!sysctlbyname("hw.physicalcpu_max", &sysctl_value, &length, NULL, 0)) {
-    physical_cpus_ = static_cast<int>(sysctl_value);
-  }
-  length = sizeof(sysctl_value);
-  if (!sysctlbyname("hw.logicalcpu_max", &sysctl_value, &length, NULL, 0)) {
-    logical_cpus_ = static_cast<int>(sysctl_value);
-  }
-  uint64_t sysctl_value64;
-  length = sizeof(sysctl_value64);
-  if (!sysctlbyname("hw.l3cachesize", &sysctl_value64, &length, NULL, 0)) {
-    cache_size_ = static_cast<int>(sysctl_value64);
-  }
-  if (!cache_size_) {
-    length = sizeof(sysctl_value64);
-    if (!sysctlbyname("hw.l2cachesize", &sysctl_value64, &length, NULL, 0)) {
-      cache_size_ = static_cast<int>(sysctl_value64);
-    }
-  }
-  length = sizeof(sysctl_value);
-  if (!sysctlbyname("machdep.cpu.family", &sysctl_value, &length, NULL, 0)) {
-    cpu_family_ = static_cast<int>(sysctl_value);
-  }
-  length = sizeof(sysctl_value);
-  if (!sysctlbyname("machdep.cpu.model", &sysctl_value, &length, NULL, 0)) {
-    cpu_model_ = static_cast<int>(sysctl_value);
-  }
-  length = sizeof(sysctl_value);
-  if (!sysctlbyname("machdep.cpu.stepping", &sysctl_value, &length, NULL, 0)) {
-    cpu_stepping_ = static_cast<int>(sysctl_value);
-  }
-#elif defined(__native_client__)
-  // TODO(ryanpetrie): Implement this via PPAPI when it's available.
-#else  // WEBRTC_LINUX
-  ProcCpuInfo proc_info;
-  if (proc_info.LoadFromSystem()) {
-    proc_info.GetNumCpus(&logical_cpus_);
-    proc_info.GetNumPhysicalCpus(&physical_cpus_);
-    proc_info.GetCpuFamily(&cpu_family_);
-#if defined(CPU_X86)
-    // These values only apply to x86 systems.
-    proc_info.GetSectionIntValue(0, "model", &cpu_model_);
-    proc_info.GetSectionIntValue(0, "stepping", &cpu_stepping_);
-    proc_info.GetSectionIntValue(0, "cpu MHz", &cpu_speed_);
-    proc_info.GetSectionIntValue(0, "cache size", &cache_size_);
-    cache_size_ *= 1024;
+#else
+  LOG(LS_ERROR) << "No function to get number of cores";
 #endif
-  }
-  // ProcCpuInfo reads cpu speed from "cpu MHz" under /proc/cpuinfo.
-  // But that number is a moving target which can change on-the-fly according to
-  // many factors including system workload.
-  // See /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors.
-  // The one in /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq is more
-  // accurate. We use it as our cpu speed when it is available.
-  // cpuinfo_max_freq is measured in KHz and requires conversion to MHz.
-  int max_freq = rtc::ReadCpuMaxFreq();
-  if (max_freq > 0) {
-    cpu_speed_ = max_freq / 1000;
-  }
-#endif
-// For L2 CacheSize see also
-// http://www.flounder.com/cpuid_explorer2.htm#CPUID(0x800000006)
-#ifdef CPU_X86
-  if (cache_size_ == 0) {
-    int cpu_info[4];
-    __cpuid(cpu_info, 0x80000000);  // query maximum extended cpuid function.
-    if (static_cast<uint32>(cpu_info[0]) >= 0x80000006) {
-      __cpuid(cpu_info, 0x80000006);
-      cache_size_ = (cpu_info[2] >> 16) * 1024;
-    }
-  }
-#endif
+
+  LOG(LS_INFO) << "Available number of cores: " << number_of_cores;
+
+  return number_of_cores;
+}
+
+// Statically cache the number of system cores available since if the process
+// is running in a sandbox, we may only be able to read the value once (before
+// the sandbox is initialized) and not thereafter.
+// For more information see crbug.com/176522.
+int SystemInfo::logical_cpus_ = 0;
+
+SystemInfo::SystemInfo() {
 }
 
 // Return the number of cpu threads available to the system.
+// static
 int SystemInfo::GetMaxCpus() {
+  if (!logical_cpus_)
+    logical_cpus_ = DetectNumberOfCores();
   return logical_cpus_;
 }
 
-// Return the number of cpu cores available to the system.
-int SystemInfo::GetMaxPhysicalCpus() {
-  return physical_cpus_;
-}
-
 // Return the number of cpus available to the process.  Since affinity can be
 // changed on the fly, do not cache this value.
 // Can be affected by heat.
 int SystemInfo::GetCurCpus() {
-  int cur_cpus;
+  int cur_cpus = 0;
 #if defined(WEBRTC_WIN)
-  DWORD_PTR process_mask, system_mask;
+  DWORD_PTR process_mask = 0;
+  DWORD_PTR system_mask = 0;
   ::GetProcessAffinityMask(::GetCurrentProcess(), &process_mask, &system_mask);
-  for (cur_cpus = 0; process_mask; ++cur_cpus) {
-    // Sparse-ones algorithm. There are slightly faster methods out there but
-    // they are unintuitive and won't make a difference on a single dword.
-    process_mask &= (process_mask - 1);
+  for (int i = 0; i < sizeof(DWORD_PTR) * 8; ++i) {
+    if (process_mask & 1)
+      ++cur_cpus;
+    process_mask >>= 1;
   }
 #elif defined(WEBRTC_MAC)
   uint32_t sysctl_value;
   size_t length = sizeof(sysctl_value);
   int error = sysctlbyname("hw.ncpu", &sysctl_value, &length, NULL, 0);
   cur_cpus = !error ? static_cast<int>(sysctl_value) : 1;
 #else
   // Linux, Solaris, WEBRTC_ANDROID
-  cur_cpus = static_cast<int>(sysconf(_SC_NPROCESSORS_ONLN));
+  cur_cpus = GetMaxCpus();
 #endif
   return cur_cpus;
 }
 
 // Return the type of this CPU.
 SystemInfo::Architecture SystemInfo::GetCpuArchitecture() {
-  return cpu_arch_;
+#if defined(__arm__) || defined(_M_ARM)
+  return SI_ARCH_ARM;
+#elif defined(__x86_64__) || defined(_M_X64)
+  return SI_ARCH_X64;
+#elif defined(__i386__) || defined(_M_IX86)
+  return SI_ARCH_X86;
+#else
+  return SI_ARCH_UNKNOWN;
+#endif
 }
 
 // Returns the vendor string from the cpu, e.g. "GenuineIntel", "AuthenticAMD".
 // See "Intel Processor Identification and the CPUID Instruction"
 // (Intel document number: 241618)
 std::string SystemInfo::GetCpuVendor() {
-  if (cpu_vendor_.empty()) {
 #if defined(CPU_X86)
-    int cpu_info[4];
-    __cpuid(cpu_info, 0);
-    cpu_info[0] = cpu_info[1];  // Reorder output
-    cpu_info[1] = cpu_info[3];
-    // cpu_info[2] = cpu_info[2];  // Avoid -Werror=self-assign
-    cpu_info[3] = 0;
-    cpu_vendor_ = std::string(reinterpret_cast<char*>(&cpu_info[0]));
+  int cpu_info[4];
+  __cpuid(cpu_info, 0);
+  cpu_info[0] = cpu_info[1];  // Reorder output
+  cpu_info[1] = cpu_info[3];
+  // cpu_info[2] = cpu_info[2];  // Avoid -Werror=self-assign
+  cpu_info[3] = 0;
+  return std::string(reinterpret_cast<char*>(&cpu_info[0]));
 #elif defined(CPU_ARM)
-    cpu_vendor_ = std::string("ARM");
+  return "ARM";
 #else
-    cpu_vendor_ = std::string("Undefined");
-#endif
-  }
-  return cpu_vendor_;
-}
-
-int SystemInfo::GetCpuCacheSize() {
-  return cache_size_;
-}
-
-// Return the "family" of this CPU.
-int SystemInfo::GetCpuFamily() {
-  return cpu_family_;
-}
-
-// Return the "model" of this CPU.
-int SystemInfo::GetCpuModel() {
-  return cpu_model_;
-}
-
-// Return the "stepping" of this CPU.
-int SystemInfo::GetCpuStepping() {
-  return cpu_stepping_;
-}
-
-// Return the clockrate of the primary processor in Mhz.  This value can be
-// cached.  Returns -1 on error.
-int SystemInfo::GetMaxCpuSpeed() {
-  if (cpu_speed_) {
-    return cpu_speed_;
-  }
-#if defined(WEBRTC_WIN)
-  HKEY key;
-  static const WCHAR keyName[] =
-      L"HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0";
-
-  if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyName , 0, KEY_QUERY_VALUE, &key)
-      == ERROR_SUCCESS) {
-    DWORD data, len;
-    len = sizeof(data);
-
-    if (RegQueryValueEx(key, L"~Mhz", 0, 0, reinterpret_cast<LPBYTE>(&data),
-                        &len) == ERROR_SUCCESS) {
-      cpu_speed_ = data;
-    } else {
-      LOG(LS_WARNING) << "Failed to query registry value HKLM\\" << keyName
-                      << "\\~Mhz";
-      cpu_speed_ = -1;
-    }
-
-    RegCloseKey(key);
-  } else {
-    LOG(LS_WARNING) << "Failed to open registry key HKLM\\" << keyName;
-    cpu_speed_ = -1;
-  }
-#elif defined(WEBRTC_MAC)
-  uint64_t sysctl_value;
-  size_t length = sizeof(sysctl_value);
-  int error = sysctlbyname("hw.cpufrequency_max", &sysctl_value, &length,
-                           NULL, 0);
-  cpu_speed_ = !error ? static_cast<int>(sysctl_value/1000000) : -1;
-#else
-  // TODO(fbarchard): Implement using proc/cpuinfo
-  cpu_speed_ = 0;
-#endif
-  return cpu_speed_;
-}
-
-// Dynamically check the current clockrate, which could be reduced because of
-// powersaving profiles.  Eventually for windows we want to query WMI for
-// root\WMI::ProcessorPerformance.InstanceName="Processor_Number_0".frequency
-int SystemInfo::GetCurCpuSpeed() {
-#if defined(WEBRTC_WIN)
-  // TODO(fbarchard): Add WMI check, requires COM initialization
-  // NOTE(fbarchard): Testable on Sandy Bridge.
-  return GetMaxCpuSpeed();
-#elif defined(WEBRTC_MAC)
-  uint64_t sysctl_value;
-  size_t length = sizeof(sysctl_value);
-  int error = sysctlbyname("hw.cpufrequency", &sysctl_value, &length, NULL, 0);
-  return !error ? static_cast<int>(sysctl_value/1000000) : GetMaxCpuSpeed();
-#else  // WEBRTC_LINUX
-  // TODO(fbarchard): Use proc/cpuinfo for Cur speed on Linux.
-  return GetMaxCpuSpeed();
+  return "Undefined";
 #endif
 }
 
 // Returns the amount of installed physical memory in Bytes.  Cacheable.
 // Returns -1 on error.
 int64 SystemInfo::GetMemorySize() {
-  if (memory_) {
-    return memory_;
-  }
+  int64 memory = -1;
 
 #if defined(WEBRTC_WIN)
   MEMORYSTATUSEX status = {0};
   status.dwLength = sizeof(status);
 
   if (GlobalMemoryStatusEx(&status)) {
-    memory_ = status.ullTotalPhys;
+    memory = status.ullTotalPhys;
   } else {
     LOG_GLE(LS_WARNING) << "GlobalMemoryStatusEx failed.";
-    memory_ = -1;
   }
 
 #elif defined(WEBRTC_MAC)
-  size_t len = sizeof(memory_);
-  int error = sysctlbyname("hw.memsize", &memory_, &len, NULL, 0);
-  if (error || memory_ == 0) {
-    memory_ = -1;
-  }
+  size_t len = sizeof(memory);
+  int error = sysctlbyname("hw.memsize", &memory, &len, NULL, 0);
+  if (error || memory == 0)
+    memory = -1;
 #else  // WEBRTC_LINUX
-  memory_ = static_cast<int64>(sysconf(_SC_PHYS_PAGES)) *
+  memory = static_cast<int64>(sysconf(_SC_PHYS_PAGES)) *
       static_cast<int64>(sysconf(_SC_PAGESIZE));
-  if (memory_ < 0) {
+  if (memory < 0) {
     LOG(LS_WARNING) << "sysconf(_SC_PHYS_PAGES) failed."
                     << "sysconf(_SC_PHYS_PAGES) " << sysconf(_SC_PHYS_PAGES)
                     << "sysconf(_SC_PAGESIZE) " << sysconf(_SC_PAGESIZE);
-    memory_ = -1;
+    memory = -1;
   }
 #endif
 
-  return memory_;
+  return memory;
 }
 
-
 // Return the name of the machine model we are currently running on.
 // This is a human readable string that consists of the name and version
 // number of the hardware, i.e 'MacBookAir1,1'. Returns an empty string if
-// model can not be determined. The string is cached for subsequent calls.
+// model can not be determined.
 std::string SystemInfo::GetMachineModel() {
-  if (!machine_model_.empty()) {
-    return machine_model_;
-  }
-
 #if defined(WEBRTC_MAC)
   char buffer[128];
   size_t length = sizeof(buffer);
   int error = sysctlbyname("hw.model", buffer, &length, NULL, 0);
-  if (!error) {
-    machine_model_.assign(buffer, length - 1);
-  } else {
-    machine_model_.clear();
-  }
+  if (!error)
+    return std::string(buffer, length - 1);
+  return std::string();
 #else
-  machine_model_ = "Not available";
+  return "Not available";
 #endif
-
-  return machine_model_;
 }
 
-#if defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
-// Helper functions to query IOKit for video hardware properties.
-static CFTypeRef SearchForProperty(io_service_t port, CFStringRef name) {
-  return IORegistryEntrySearchCFProperty(port, kIOServicePlane,
-      name, kCFAllocatorDefault,
-      kIORegistryIterateRecursively | kIORegistryIterateParents);
-}
-
-static void GetProperty(io_service_t port, CFStringRef name, int* value) {
-  if (!value) return;
-  CFTypeRef ref = SearchForProperty(port, name);
-  if (ref) {
-    CFTypeID refType = CFGetTypeID(ref);
-    if (CFNumberGetTypeID() == refType) {
-      CFNumberRef number = reinterpret_cast<CFNumberRef>(ref);
-      p_convertCFNumberToInt(number, value);
-    } else if (CFDataGetTypeID() == refType) {
-      CFDataRef data = reinterpret_cast<CFDataRef>(ref);
-      if (CFDataGetLength(data) == sizeof(UInt32)) {
-        *value = *reinterpret_cast<const UInt32*>(CFDataGetBytePtr(data));
-      }
-    }
-    CFRelease(ref);
-  }
-}
-
-static void GetProperty(io_service_t port, CFStringRef name,
-                        std::string* value) {
-  if (!value) return;
-  CFTypeRef ref = SearchForProperty(port, name);
-  if (ref) {
-    CFTypeID refType = CFGetTypeID(ref);
-    if (CFStringGetTypeID() == refType) {
-      CFStringRef stringRef = reinterpret_cast<CFStringRef>(ref);
-      p_convertHostCFStringRefToCPPString(stringRef, *value);
-    } else if (CFDataGetTypeID() == refType) {
-      CFDataRef dataRef = reinterpret_cast<CFDataRef>(ref);
-      *value = std::string(reinterpret_cast<const char*>(
-          CFDataGetBytePtr(dataRef)), CFDataGetLength(dataRef));
-    }
-    CFRelease(ref);
-  }
-}
-#endif
-
-SystemInfo::GpuInfo::GpuInfo() : vendor_id(0), device_id(0) {
-}
-
-SystemInfo::GpuInfo::~GpuInfo() = default;
-
-// Fills a struct with information on the graphics adapater and returns true
-// iff successful.
-bool SystemInfo::GetGpuInfo(GpuInfo *info) {
-  if (!info) return false;
-#if defined(WEBRTC_WIN) && !defined(EXCLUDE_D3D9)
-  D3DADAPTER_IDENTIFIER9 identifier;
-  HRESULT hr = E_FAIL;
-  HINSTANCE d3d_lib = LoadLibrary(L"d3d9.dll");
-
-  if (d3d_lib) {
-    typedef IDirect3D9* (WINAPI *D3DCreate9Proc)(UINT);
-    D3DCreate9Proc d3d_create_proc = reinterpret_cast<D3DCreate9Proc>(
-        GetProcAddress(d3d_lib, "Direct3DCreate9"));
-    if (d3d_create_proc) {
-      IDirect3D9* d3d = d3d_create_proc(D3D_SDK_VERSION);
-      if (d3d) {
-        hr = d3d->GetAdapterIdentifier(D3DADAPTER_DEFAULT, 0, &identifier);
-        d3d->Release();
-      }
-    }
-    FreeLibrary(d3d_lib);
-  }
-
-  if (hr != D3D_OK) {
-    LOG(LS_ERROR) << "Failed to access Direct3D9 information.";
-    return false;
-  }
-
-  info->device_name = identifier.DeviceName;
-  info->description = identifier.Description;
-  info->vendor_id = identifier.VendorId;
-  info->device_id = identifier.DeviceId;
-  info->driver = identifier.Driver;
-  // driver_version format: product.version.subversion.build
-  std::stringstream ss;
-  ss << HIWORD(identifier.DriverVersion.HighPart) << "."
-     << LOWORD(identifier.DriverVersion.HighPart) << "."
-     << HIWORD(identifier.DriverVersion.LowPart) << "."
-     << LOWORD(identifier.DriverVersion.LowPart);
-  info->driver_version = ss.str();
-  return true;
-#elif defined(WEBRTC_MAC) && !defined(WEBRTC_IOS)
-  // We'll query the IOKit for the gpu of the main display.
-  io_service_t display_service_port = CGDisplayIOServicePort(
-      kCGDirectMainDisplay);
-  GetProperty(display_service_port, CFSTR("vendor-id"), &info->vendor_id);
-  GetProperty(display_service_port, CFSTR("device-id"), &info->device_id);
-  GetProperty(display_service_port, CFSTR("model"), &info->description);
-  return true;
-#else  // WEBRTC_LINUX
-  // TODO(fbarchard): Implement this on Linux
-  return false;
-#endif
-}
 }  // namespace rtc