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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_transfer_function_h
#define wasm_analysis_transfer_function_h
#if __cplusplus >= 202002L
#include <concepts>
#include <iterator>
#include <ranges>
#endif
#include <queue>
#include "cfg.h"
#include "lattice.h"
namespace wasm::analysis {
#if __cplusplus >= 202002L
template<typename T>
concept BasicBlockInputRange =
std::ranges::input_range<T> &&
std::is_same<std::ranges::range_value_t<T>, BasicBlock>::value;
template<typename TxFn, typename L>
concept TransferFunctionImpl = requires(TxFn& txfn,
const CFG& cfg,
BasicBlock* bb,
typename L::Element& elem,
std::queue<const BasicBlock*>& bbq) {
// Apply the transfer function to update a lattice element with information
// from a basic block.
{ txfn.transfer(bb, elem) } noexcept -> std::same_as<void>;
// Initializes the worklist of basic blocks, which can affect performance
// depending on the direction of the analysis. TODO: Unlock performance
// benefits while exposing fewer implementation details.
{ txfn.enqueueWorklist(cfg, bbq) } noexcept -> std::same_as<void>;
// Get a range over the basic blocks that depend on the given block.
{ txfn.getDependents(bb) } noexcept -> BasicBlockInputRange;
};
#define TransferFunction TransferFunctionImpl<L>
#else
#define TransferFunction typename
#endif // __cplusplus >= 202002L
} // namespace wasm::analysis
#endif // wasm_analysis_transfer_function_h
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