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/*
* Copyright (C) 2015 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
#define ART_RUNTIME_EXPERIMENTAL_FLAGS_H_
#include <ostream>
namespace art {
// Possible experimental features that might be enabled.
struct ExperimentalFlags {
// The actual flag values.
enum {
kNone = 0x0000,
kMethodHandles = 0x0004, // 0b00000100
};
constexpr ExperimentalFlags() : value_(0x0000) {}
constexpr ExperimentalFlags(decltype(kNone) t) // NOLINT, implicit
: value_(static_cast<uint32_t>(t)) {}
constexpr operator decltype(kNone)() const {
return static_cast<decltype(kNone)>(value_);
}
constexpr explicit operator bool() const {
return value_ != kNone;
}
constexpr ExperimentalFlags operator|(const decltype(kNone)& b) const {
return static_cast<decltype(kNone)>(value_ | static_cast<uint32_t>(b));
}
constexpr ExperimentalFlags operator|(const ExperimentalFlags& b) const {
return static_cast<decltype(kNone)>(value_ | b.value_);
}
constexpr ExperimentalFlags operator&(const ExperimentalFlags& b) const {
return static_cast<decltype(kNone)>(value_ & b.value_);
}
constexpr ExperimentalFlags operator&(const decltype(kNone)& b) const {
return static_cast<decltype(kNone)>(value_ & static_cast<uint32_t>(b));
}
constexpr bool operator==(const ExperimentalFlags& b) const {
return value_ == b.value_;
}
private:
uint32_t value_;
};
inline std::ostream& operator<<(std::ostream& stream, const ExperimentalFlags& e) {
bool started = false;
if (e & ExperimentalFlags::kMethodHandles) {
stream << (started ? "|" : "") << "kMethodHandles";
started = true;
}
if (!started) {
stream << "kNone";
}
return stream;
}
inline std::ostream& operator<<(std::ostream& stream, const decltype(ExperimentalFlags::kNone)& e) {
return stream << ExperimentalFlags(e);
}
} // namespace art
#endif // ART_RUNTIME_EXPERIMENTAL_FLAGS_H_