150 lines
6.1 KiB
C++
150 lines
6.1 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_INSTRUCTION_SET_FEATURES_H_
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#define ART_RUNTIME_ARCH_INSTRUCTION_SET_FEATURES_H_
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#include <iosfwd>
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#include <memory>
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#include <vector>
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#include "arch/instruction_set.h"
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#include "base/macros.h"
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namespace art {
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class ArmInstructionSetFeatures;
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class Arm64InstructionSetFeatures;
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class X86InstructionSetFeatures;
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class X86_64InstructionSetFeatures;
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// Abstraction used to describe features of a different instruction sets.
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class InstructionSetFeatures {
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public:
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// Process a CPU variant string for the given ISA and create an InstructionSetFeatures.
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static std::unique_ptr<const InstructionSetFeatures> FromVariant(InstructionSet isa,
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const std::string& variant,
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std::string* error_msg);
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// Parse a bitmap for the given isa and create an InstructionSetFeatures.
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static std::unique_ptr<const InstructionSetFeatures> FromBitmap(InstructionSet isa,
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uint32_t bitmap);
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// Turn C pre-processor #defines into the equivalent instruction set features for kRuntimeISA.
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static std::unique_ptr<const InstructionSetFeatures> FromCppDefines();
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// Check if run-time detection of instruction set features is supported.
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//
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// Return: true - if run-time detection is supported on a target device.
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// false - otherwise
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static bool IsRuntimeDetectionSupported() {
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return FromRuntimeDetection() != nullptr;
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}
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// Use run-time detection to get instruction set features.
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//
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// Return: a set of detected features or nullptr if runtime detection is not
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// supported on a target.
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static std::unique_ptr<const InstructionSetFeatures> FromRuntimeDetection();
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// Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures.
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static std::unique_ptr<const InstructionSetFeatures> FromCpuInfo();
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// Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce
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// InstructionSetFeatures.
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static std::unique_ptr<const InstructionSetFeatures> FromHwcap();
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// Use assembly tests of the current runtime (ie kRuntimeISA) to determine the
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// InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo.
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static std::unique_ptr<const InstructionSetFeatures> FromAssembly();
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// Use external cpu_features library.
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static std::unique_ptr<const InstructionSetFeatures> FromCpuFeatures();
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// Parse a string of the form "div,-atomic_ldrd_strd" adding and removing these features to
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// create a new InstructionSetFeatures.
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std::unique_ptr<const InstructionSetFeatures> AddFeaturesFromString(
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const std::string& feature_list, std::string* error_msg) const WARN_UNUSED;
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// Are these features the same as the other given features?
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virtual bool Equals(const InstructionSetFeatures* other) const = 0;
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// For testing purposes we want to make sure that the system we run on has at
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// least the options we claim it has. In this cases Equals() does not
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// suffice and will cause the test to fail, since the runtime cpu feature
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// detection claims more capabilities then statically specified from the
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// build system.
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//
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// A good example of this is the armv8 ART test target that declares
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// "CPU_VARIANT=generic". If the generic target is specified and the code
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// is run on a platform with enhanced capabilities, the
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// instruction_set_features test will fail if we resort to using Equals()
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// between statically defined cpu features and runtime cpu features.
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//
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// For now we default this to Equals() in case the architecture does not
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// provide it.
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virtual bool HasAtLeast(const InstructionSetFeatures* other) const {
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return Equals(other);
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}
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// Return the ISA these features relate to.
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virtual InstructionSet GetInstructionSet() const = 0;
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// Return a bitmap that represents the features. ISA specific.
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virtual uint32_t AsBitmap() const = 0;
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// Return a string of the form "div,lpae" or "none".
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virtual std::string GetFeatureString() const = 0;
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// Down cast this ArmInstructionFeatures.
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const ArmInstructionSetFeatures* AsArmInstructionSetFeatures() const;
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// Down cast this Arm64InstructionFeatures.
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const Arm64InstructionSetFeatures* AsArm64InstructionSetFeatures() const;
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// Down cast this X86InstructionFeatures.
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const X86InstructionSetFeatures* AsX86InstructionSetFeatures() const;
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// Down cast this X86_64InstructionFeatures.
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const X86_64InstructionSetFeatures* AsX86_64InstructionSetFeatures() const;
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virtual ~InstructionSetFeatures() {}
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protected:
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InstructionSetFeatures() {}
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// Returns true if variant appears in the array variants.
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static bool FindVariantInArray(const char* const variants[], size_t num_variants,
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const std::string& variant);
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// Add architecture specific features in sub-classes.
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virtual std::unique_ptr<const InstructionSetFeatures>
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AddFeaturesFromSplitString(const std::vector<std::string>& features,
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std::string* error_msg) const = 0;
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// Add run-time detected architecture specific features in sub-classes.
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virtual std::unique_ptr<const InstructionSetFeatures>
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AddRuntimeDetectedFeatures(const InstructionSetFeatures *features ATTRIBUTE_UNUSED) const;
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private:
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DISALLOW_COPY_AND_ASSIGN(InstructionSetFeatures);
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};
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std::ostream& operator<<(std::ostream& os, const InstructionSetFeatures& rhs);
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} // namespace art
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#endif // ART_RUNTIME_ARCH_INSTRUCTION_SET_FEATURES_H_
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