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85 lines
2.5 KiB
85 lines
2.5 KiB
/*
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* Copyright (C) 2015 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_EXPERIMENTAL_FLAGS_H_
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#define ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
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#include <ostream>
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namespace art {
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// Possible experimental features that might be enabled.
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struct ExperimentalFlags {
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// The actual flag values.
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enum {
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kNone = 0x0000,
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kMethodHandles = 0x0004, // 0b00000100
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};
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constexpr ExperimentalFlags() : value_(0x0000) {}
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constexpr ExperimentalFlags(decltype(kNone) t) // NOLINT [runtime/explicit]
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: value_(static_cast<uint32_t>(t)) {}
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constexpr operator decltype(kNone)() const {
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return static_cast<decltype(kNone)>(value_);
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}
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constexpr explicit operator bool() const {
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return value_ != kNone;
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}
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constexpr ExperimentalFlags operator|(const decltype(kNone)& b) const {
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return static_cast<decltype(kNone)>(value_ | static_cast<uint32_t>(b));
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}
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constexpr ExperimentalFlags operator|(const ExperimentalFlags& b) const {
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return static_cast<decltype(kNone)>(value_ | b.value_);
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}
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constexpr ExperimentalFlags operator&(const ExperimentalFlags& b) const {
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return static_cast<decltype(kNone)>(value_ & b.value_);
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}
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constexpr ExperimentalFlags operator&(const decltype(kNone)& b) const {
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return static_cast<decltype(kNone)>(value_ & static_cast<uint32_t>(b));
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}
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constexpr bool operator==(const ExperimentalFlags& b) const {
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return value_ == b.value_;
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}
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private:
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uint32_t value_;
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};
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inline std::ostream& operator<<(std::ostream& stream, const ExperimentalFlags& e) {
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bool started = false;
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if (e & ExperimentalFlags::kMethodHandles) {
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stream << (started ? "|" : "") << "kMethodHandles";
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started = true;
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}
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if (!started) {
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stream << "kNone";
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}
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return stream;
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}
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inline std::ostream& operator<<(std::ostream& stream, const decltype(ExperimentalFlags::kNone)& e) {
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return stream << ExperimentalFlags(e);
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}
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} // namespace art
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#endif // ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
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