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/*
* Copyright 2019 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.
*/
//
// Removes duplicate imports.
//
// TODO: non-function imports too
//
#include "ir/import-utils.h"
#include "opt-utils.h"
#include "pass.h"
#include "wasm.h"
namespace wasm {
struct DuplicateImportElimination : public Pass {
// This pass does not alter function contents.
bool requiresNonNullableLocalFixups() override { return false; }
void run(Module* module) override {
ImportInfo imports(*module);
std::map<Name, Name> replacements;
std::map<std::pair<Name, Name>, Name> seen;
std::vector<Name> toRemove;
for (auto* func : imports.importedFunctions) {
auto pair = std::pair{func->module, func->base};
auto iter = seen.find(pair);
if (iter != seen.end()) {
auto previousName = iter->second;
auto previousFunc = module->getFunction(previousName);
// It is ok to import the same thing with multiple types; we can only
// merge if the types match, of course.
if (previousFunc->type == func->type) {
replacements[func->name] = previousName;
toRemove.push_back(func->name);
continue;
}
}
seen[pair] = func->name;
}
if (!replacements.empty()) {
module->updateMaps();
OptUtils::replaceFunctions(getPassRunner(), *module, replacements);
for (auto name : toRemove) {
module->removeFunction(name);
}
}
}
};
Pass* createDuplicateImportEliminationPass() {
return new DuplicateImportElimination();
}
} // namespace wasm
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