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/*
* Copyright 2016 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.
*/
//
// Sorts locals by access frequency.
//
#include <memory>
#include <wasm.h>
#include <pass.h>
namespace wasm {
struct ReorderLocals : public WalkerPass<PostWalker<ReorderLocals>> {
std::map<Name, uint32_t> counts;
void visitFunction(Function *curr) {
auto& vars = curr->vars;
sort(vars.begin(), vars.end(), [this](NameType a, NameType b) -> bool {
if (this->counts[a.name] == this->counts[b.name]) {
return strcmp(a.name.str, b.name.str) > 0;
}
return this->counts[a.name] > this->counts[b.name];
});
// drop completely unused vars
while (vars.size() > 0 && counts[vars.back().name] == 0) {
vars.pop_back();
}
counts.clear();
}
void visitGetLocal(GetLocal *curr) {
counts[curr->name]++;
}
void visitSetLocal(SetLocal *curr) {
counts[curr->name]++;
}
};
static RegisterPass<ReorderLocals> registerPass("reorder-locals", "sorts locals by access frequency");
} // namespace wasm
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