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f9a6a5bdd2
TEST=build Change-Id: I2834ef7cf7cb7c8770f8167a2438cbedcee5c623 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292063 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if !defined(DART_HOST_OS_MACOS)
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#include "vm/cpuid.h"
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#if defined(HOST_ARCH_IA32) || defined(HOST_ARCH_X64)
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// GetCpuId() on Windows, __get_cpuid() on Linux
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#if defined(DART_HOST_OS_WINDOWS)
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#include <intrin.h> // NOLINT
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#else
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#include <cpuid.h> // NOLINT
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#endif
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#endif
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namespace dart {
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bool CpuId::sse2_ = false;
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bool CpuId::sse41_ = false;
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bool CpuId::popcnt_ = false;
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bool CpuId::abm_ = false;
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const char* CpuId::id_string_ = nullptr;
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const char* CpuId::brand_string_ = nullptr;
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#if defined(HOST_ARCH_IA32) || defined(HOST_ARCH_X64)
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static void GetCpuId(int32_t level, uint32_t info[4]) {
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#if defined(DART_HOST_OS_WINDOWS)
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// The documentation for __cpuid is at:
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// http://msdn.microsoft.com/en-us/library/hskdteyh(v=vs.90).aspx
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__cpuid(reinterpret_cast<int*>(info), level);
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#else
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__get_cpuid(level, &info[0], &info[1], &info[2], &info[3]);
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#endif
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}
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void CpuId::Init() {
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uint32_t info[4] = {static_cast<uint32_t>(-1)};
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GetCpuId(0, info);
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char* id_string = reinterpret_cast<char*>(malloc(3 * sizeof(int32_t)));
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// Yes, these are supposed to be out of order.
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*reinterpret_cast<uint32_t*>(id_string) = info[1];
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*reinterpret_cast<uint32_t*>(id_string + 4) = info[3];
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*reinterpret_cast<uint32_t*>(id_string + 8) = info[2];
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CpuId::id_string_ = id_string;
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GetCpuId(1, info);
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CpuId::sse41_ = (info[2] & (1 << 19)) != 0;
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CpuId::sse2_ = (info[3] & (1 << 26)) != 0;
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CpuId::popcnt_ = (info[2] & (1 << 23)) != 0;
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GetCpuId(0x80000001, info);
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CpuId::abm_ = (info[2] & (1 << 5)) != 0;
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// Brand string returned by CPUID is expected to be nullptr-terminated,
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// however we have seen cases in the wild which violate this assumption.
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// To avoid going out of bounds when trying to print this string
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// we add null-terminator ourselves, just in case.
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//
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// See https://github.com/flutter/flutter/issues/114346
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char* brand_string = reinterpret_cast<char*>(calloc(3 * sizeof(info) + 1, 1));
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for (uint32_t i = 0; i < 2; i++) {
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GetCpuId(0x80000002U + i, info);
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memmove(&brand_string[i * sizeof(info)], &info, sizeof(info));
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}
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CpuId::brand_string_ = brand_string;
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}
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void CpuId::Cleanup() {
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ASSERT(id_string_ != nullptr);
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free(const_cast<char*>(id_string_));
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id_string_ = nullptr;
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ASSERT(brand_string_ != nullptr);
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free(const_cast<char*>(brand_string_));
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brand_string_ = nullptr;
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}
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const char* CpuId::id_string() {
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return Utils::StrDup(id_string_);
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}
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const char* CpuId::brand_string() {
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return Utils::StrDup(brand_string_);
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}
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const char* CpuId::field(CpuInfoIndices idx) {
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switch (idx) {
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case kCpuInfoProcessor:
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return id_string();
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case kCpuInfoModel:
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return brand_string();
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case kCpuInfoHardware:
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return brand_string();
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case kCpuInfoFeatures: {
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char buffer[100];
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char* p = buffer;
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const char* q = p + 100;
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*p = '\0';
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if (sse2()) {
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p += snprintf(p, q - p, "sse2 ");
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}
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if (sse41()) {
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p += snprintf(p, q - p, "sse4.1 ");
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}
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if (popcnt()) {
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p += snprintf(p, q - p, "popcnt ");
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}
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if (abm()) {
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p += snprintf(p, q - p, "abm ");
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}
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// Remove last space before returning string.
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if (p != buffer) *(p - 1) = '\0';
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return Utils::StrDup(buffer);
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}
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default: {
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UNREACHABLE();
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return nullptr;
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}
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}
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}
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#endif // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
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} // namespace dart
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#endif // !defined(DART_HOST_OS_MACOS)
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