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* Copyright (C) 2011 The Android Open Source Project
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <ostream>
#include <vector>
#include "base/macros.h"
#include "instruction_set.h"
namespace art {
class ArmInstructionSetFeatures;
class Arm64InstructionSetFeatures;
class MipsInstructionSetFeatures;
class Mips64InstructionSetFeatures;
class X86InstructionSetFeatures;
class X86_64InstructionSetFeatures;
// Abstraction used to describe features of a different instruction sets.
class InstructionSetFeatures {
// Process a CPU variant string for the given ISA and create an InstructionSetFeatures.
static const InstructionSetFeatures* FromVariant(InstructionSet isa,
const std::string& variant,
std::string* error_msg);
// Parse a bitmap for the given isa and create an InstructionSetFeatures.
static const InstructionSetFeatures* FromBitmap(InstructionSet isa, uint32_t bitmap);
// Turn C pre-processor #defines into the equivalent instruction set features for kRuntimeISA.
static const InstructionSetFeatures* FromCppDefines();
// Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
static const InstructionSetFeatures* FromCpuInfo();
// Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
// InstructionSetFeatures.
static const InstructionSetFeatures* FromHwcap();
// Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
// InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
static const InstructionSetFeatures* FromAssembly();
// Parse a string of the form "div,-atomic_ldrd_strd" adding and removing these features to
// create a new InstructionSetFeatures.
const InstructionSetFeatures* AddFeaturesFromString(const std::string& feature_list,
std::string* error_msg) const WARN_UNUSED;
// Are these features the same as the other given features?
virtual bool Equals(const InstructionSetFeatures* other) const = 0;
// Return the ISA these features relate to.
virtual InstructionSet GetInstructionSet() const = 0;
// Return a bitmap that represents the features. ISA specific.
virtual uint32_t AsBitmap() const = 0;
// Return a string of the form "div,lpae" or "none".
virtual std::string GetFeatureString() const = 0;
// Does the instruction set variant require instructions for correctness with SMP?
bool IsSmp() const {
return smp_;
// Down cast this ArmInstructionFeatures.
const ArmInstructionSetFeatures* AsArmInstructionSetFeatures() const;
// Down cast this Arm64InstructionFeatures.
const Arm64InstructionSetFeatures* AsArm64InstructionSetFeatures() const;
// Down cast this MipsInstructionFeatures.
const MipsInstructionSetFeatures* AsMipsInstructionSetFeatures() const;
// Down cast this Mips64InstructionFeatures.
const Mips64InstructionSetFeatures* AsMips64InstructionSetFeatures() const;
// Down cast this X86InstructionFeatures.
const X86InstructionSetFeatures* AsX86InstructionSetFeatures() const;
// Down cast this X86_64InstructionFeatures.
const X86_64InstructionSetFeatures* AsX86_64InstructionSetFeatures() const;
virtual ~InstructionSetFeatures() {}
explicit InstructionSetFeatures(bool smp) : smp_(smp) {}
// Returns true if variant appears in the array variants.
static bool FindVariantInArray(const char* const variants[], size_t num_variants,
const std::string& variant);
// Add architecture specific features in sub-classes.
virtual const InstructionSetFeatures*
AddFeaturesFromSplitString(bool smp, const std::vector<std::string>& features,
std::string* error_msg) const = 0;
const bool smp_;
std::ostream& operator<<(std::ostream& os, const InstructionSetFeatures& rhs);
} // namespace art