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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.
*/
#include "stringify-walker.h"
namespace wasm {
size_t StringifyHasher::operator()(Expression* curr) const {
if (Properties::isControlFlowStructure(curr)) {
if (auto* iff = curr->dynCast<If>()) {
size_t digest = wasm::hash(iff->_id);
rehash(digest, ExpressionAnalyzer::hash(iff->ifTrue));
if (iff->ifFalse) {
rehash(digest, ExpressionAnalyzer::hash(iff->ifFalse));
}
return digest;
}
return ExpressionAnalyzer::hash(curr);
}
return ExpressionAnalyzer::shallowHash(curr);
}
bool StringifyEquator::operator()(Expression* lhs, Expression* rhs) const {
if (Properties::isControlFlowStructure(lhs) &&
Properties::isControlFlowStructure(rhs)) {
auto* iffl = lhs->dynCast<If>();
auto* iffr = rhs->dynCast<If>();
if (iffl && iffr) {
return ExpressionAnalyzer::equal(iffl->ifTrue, iffr->ifTrue) &&
ExpressionAnalyzer::equal(iffl->ifFalse, iffr->ifFalse);
}
return ExpressionAnalyzer::equal(lhs, rhs);
}
return ExpressionAnalyzer::shallowEqual(lhs, rhs);
}
void HashStringifyWalker::addUniqueSymbol() {
// Use a negative value to distinguish symbols for separators from symbols
// for Expressions
assert((uint32_t)nextSeparatorVal >= nextVal);
hashString.push_back((uint32_t)nextSeparatorVal);
nextSeparatorVal--;
}
void HashStringifyWalker::visitExpression(Expression* curr) {
auto [it, inserted] = exprToCounter.insert({curr, nextVal});
hashString.push_back(it->second);
if (inserted) {
nextVal++;
}
}
} // namespace wasm
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