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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.
*/
//
// Make all types final or unfinal (open). A typical workflow might be to un-
// finalize all types, optimize a lot, and then finalize at the end.
//
#include "ir/module-utils.h"
#include "ir/subtypes.h"
#include "ir/type-updating.h"
#include "pass.h"
#include "wasm-type.h"
#include "wasm.h"
namespace wasm {
namespace {
struct TypeFinalizing : public Pass {
// Whether we should finalize or unfinalize types.
bool finalize;
// We will only modify types that we are allowed to.
std::unordered_set<HeapType> modifiableTypes;
TypeFinalizing(bool finalize) : finalize(finalize) {}
void run(Module* module) override {
if (!module->features.hasGC()) {
return;
}
// To make a type final, it must have no subtypes.
std::optional<SubTypes> subTypes;
if (finalize) {
subTypes = SubTypes(*module);
}
auto privateTypes = ModuleUtils::getPrivateHeapTypes(*module);
for (auto type : privateTypes) {
// If we are finalizing types then we can only do that to leaf types. If
// we are unfinalizing, we can do that unconditionally.
if (!finalize || subTypes->getImmediateSubTypes(type).empty()) {
modifiableTypes.insert(type);
}
}
class TypeRewriter : public GlobalTypeRewriter {
TypeFinalizing& parent;
public:
TypeRewriter(Module& wasm, TypeFinalizing& parent)
: GlobalTypeRewriter(wasm), parent(parent) {}
void modifyTypeBuilderEntry(TypeBuilder& typeBuilder,
Index i,
HeapType oldType) override {
if (parent.modifiableTypes.count(oldType)) {
typeBuilder[i].setOpen(!parent.finalize);
}
}
};
TypeRewriter(*module, *this).update();
}
};
} // anonymous namespace
Pass* createTypeFinalizingPass() { return new TypeFinalizing(true); }
Pass* createTypeUnFinalizingPass() { return new TypeFinalizing(false); }
} // namespace wasm
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