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NameTypes.cpp

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NameTypes.cpp

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/*
* Copyright 2021 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 "ir/module-utils.h"
#include "pass.h"
#include "wasm.h"
//
// Ensures each type has a name. This can be useful for debugging.
//
namespace wasm {
// An arbitrary limit, above which we rename types.
static const size_t NameLenLimit = 20;
struct NameTypes : public Pass {
bool requiresNonNullableLocalFixups() override { return false; }
void run(Module* module) override {
// Find all the types.
std::vector<HeapType> types = ModuleUtils::collectHeapTypes(*module);
std::unordered_set<Name> used;
// Ensure simple names. If a name already exists, and is short enough, keep
// it.
size_t i = 0;
for (auto& type : types) {
if (!module->typeNames.contains(type) ||
module->typeNames[type].name.size() >= NameLenLimit) {
module->typeNames[type].name = "type_" + std::to_string(i++);
}
used.insert(module->typeNames[type].name);
}
// "Lint" the names a little. In particular a name with a "_7" or such
// suffix, as TypeSSA creates, can be removed if it does not cause a
// collision. This keeps the names unique while removing 'noise.'
//
// Note we must iterate in a deterministic order here, so do it on |types|.
for (auto& type : types) {
auto& names = module->typeNames[type];
std::string name = names.name.toString();
while (name.size() > 1 && isdigit(name.back())) {
name.pop_back();
}
if (name.size() > 1 && name.back() == '_') {
name.pop_back();
if (!used.contains(name)) {
names.name = name;
used.insert(name);
}
}
}
}
};
Pass* createNameTypesPass() { return new NameTypes(); }
} // namespace wasm
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