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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_int_h
#define wasm_analysis_lattices_int_h
#include <cstdint>
#include <limits>
#include "../lattice.h"
namespace wasm::analysis {
// The lattice of integers of the given type `T`, ordered by <. The min integer
// is the bottom element and the max integer is the top element.
#if __cplusplus >= 202002L
template<std::integral T>
#else
template<typename T>
#endif
struct Integer {
using Element = T;
Element getBottom() const noexcept { return std::numeric_limits<T>::min(); }
Element getTop() const noexcept { return std::numeric_limits<T>::max(); }
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;
}
};
using Int32 = Integer<int32_t>;
using UInt32 = Integer<uint32_t>;
using Int64 = Integer<int64_t>;
using UInt64 = Integer<uint64_t>;
#if __cplusplus >= 202002L
static_assert(FullLattice<Int32>);
static_assert(FullLattice<Int64>);
static_assert(FullLattice<UInt32>);
static_assert(FullLattice<UInt64>);
#endif // __cplusplus >= 202002L
} // namespace wasm::analysis
#endif // wasm_analysis_lattices_int_h
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