cpu_arm64.h

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// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
 
#ifndef RUNTIME_VM_CPU_ARM64_H_
#define RUNTIME_VM_CPU_ARM64_H_
 
#if !defined(RUNTIME_VM_CPU_H_)
#error Do not include cpu_arm64.h directly; use cpu.h instead.
#endif
 
#include "vm/allocation.h"
#include "vm/flags.h"
#include "vm/simulator.h"
 
namespace dart {
 
// TargetCPUFeatures gives CPU features for the architecture that we are
// generating code for. HostCPUFeatures gives the CPU features for the
// architecture that we are actually running on. When the architectures
// are the same, TargetCPUFeatures will query HostCPUFeatures. When they are
// different (i.e. we are running in a simulator), HostCPUFeatures will
// additionally mock the options needed for the target architecture so that
// they may be altered for testing.
 
class HostCPUFeatures : public AllStatic {
 public:
  static void Init();
  static void Cleanup();
  static const char* hardware() {
    DEBUG_ASSERT(initialized_);
    return hardware_;
  }
 
 private:
  static const char* hardware_;
#if defined(DEBUG)
  static bool initialized_;
#endif
};
 
class TargetCPUFeatures : public AllStatic {
 public:
  static void Init() { HostCPUFeatures::Init(); }
  static void Cleanup() { HostCPUFeatures::Cleanup(); }
  static const char* hardware() { return HostCPUFeatures::hardware(); }
  static bool double_truncate_round_supported() { return false; }
  static bool atomic_memory_supported() {
#if defined(DART_TARGET_OS_MACOS) && !defined(DART_TARGET_OS_MACOS_IOS)
    return true;  // Mac ARM64 starts at ARMv8.5.
#else
    return false;  // All else start at ARMv8.0.
#endif
  }
};
 
}  // namespace dart
 
#endif  // RUNTIME_VM_CPU_ARM64_H_