Reset trunk to 3.24.35.4

src/a64/cpu-a64.h

-// Copyright 2013 the V8 project 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.
-
-#ifndef V8_A64_CPU_A64_H_
-#define V8_A64_CPU_A64_H_
-
-#include <stdio.h>
-#include "serialize.h"
-#include "cpu.h"
-
-namespace v8 {
-namespace internal {
-
-
-// CpuFeatures keeps track of which features are supported by the target CPU.
-// Supported features must be enabled by a CpuFeatureScope before use.
-class CpuFeatures : public AllStatic {
- public:
-  // Detect features of the target CPU. Set safe defaults if the serializer
-  // is enabled (snapshots must be portable).
-  static void Probe();
-
-  // Check whether a feature is supported by the target CPU.
-  static bool IsSupported(CpuFeature f) {
-    ASSERT(initialized_);
-    // There are no optional features for A64.
-    return false;
-  };
-
-  static bool IsFoundByRuntimeProbingOnly(CpuFeature f) {
-    ASSERT(initialized_);
-    // There are no optional features for A64.
-    return false;
-  }
-
-  static bool IsSafeForSnapshot(CpuFeature f) {
-    return (IsSupported(f) &&
-            (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f)));
-  }
-
-  // I and D cache line size in bytes.
-  static unsigned dcache_line_size();
-  static unsigned icache_line_size();
-
-  static unsigned supported_;
-
-  static bool VerifyCrossCompiling() {
-    // There are no optional features for A64.
-    ASSERT(cross_compile_ == 0);
-    return true;
-  }
-
-  static bool VerifyCrossCompiling(CpuFeature f) {
-    // There are no optional features for A64.
-    USE(f);
-    ASSERT(cross_compile_ == 0);
-    return true;
-  }
-
- private:
-  // Return the content of the cache type register.
-  static uint32_t GetCacheType();
-
-  // I and D cache line size in bytes.
-  static unsigned icache_line_size_;
-  static unsigned dcache_line_size_;
-
-#ifdef DEBUG
-  static bool initialized_;
-#endif
-
-  // This isn't used (and is always 0), but it is required by V8.
-  static unsigned found_by_runtime_probing_only_;
-
-  static unsigned cross_compile_;
-
-  friend class PlatformFeatureScope;
-  DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
-};
-
-} }  // namespace v8::internal
-
-#endif  // V8_A64_CPU_A64_H_