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/*
* Copyright 2023 WebAssembly Community Group participants
*
* 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 wasm_analysis_lattices_bool_h
#define wasm_analysis_lattices_bool_h
#include "../lattice.h"
namespace wasm::analysis {
// A lattice with two elements: the top element is `true` and the bottom element
// is `false`.
struct Bool {
using Element = bool;
Element getBottom() const noexcept { return false; }
Element getTop() const noexcept { return true; }
LatticeComparison compare(Element a, Element b) const noexcept {
return a > b ? GREATER : a == b ? EQUAL : LESS;
}
bool join(Element& joinee, Element joiner) const noexcept {
if (!joinee && joiner) {
joinee = joiner;
return true;
}
return false;
}
bool meet(Element& meetee, Element meeter) const noexcept {
if (meetee && !meeter) {
meetee = meeter;
return true;
}
return false;
}
};
#if __cplusplus >= 202002L
static_assert(Lattice<Bool>);
#endif // __cplusplus >= 202002L
} // namespace wasm::analysis
#endif // wasm_analysis_lattices_bool_h
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