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/*
* Copyright 2017 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_ast_hashed_h
#include "support/hash.h"
#include "wasm.h"
#include "ast_utils.h"
namespace wasm {
// An expression with a cached hash value
struct HashedExpression {
Expression* expr;
size_t hash;
HashedExpression(Expression* expr) : expr(expr) {
if (expr) {
hash = ExpressionAnalyzer::hash(expr);
}
}
HashedExpression(const HashedExpression& other) : expr(other.expr), hash(other.hash) {}
};
struct ExpressionHasher {
size_t operator()(const HashedExpression value) const {
return value.hash;
}
};
struct ExpressionComparer {
bool operator()(const HashedExpression a, const HashedExpression b) const {
if (a.hash != b.hash) return false;
return ExpressionAnalyzer::equal(a.expr, b.expr);
}
};
template<typename T>
class HashedExpressionMap : public std::unordered_map<HashedExpression, T, ExpressionHasher, ExpressionComparer> {
};
} // namespace wasm
#endif // _wasm_ast_hashed_h
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