bfd354492e
With this change, we now have ~1200 CellAllocators across both LibJS and LibWeb in a normal WebContent instance. This gives us a minimum heap size of 4.7 MiB in the scenario where we only have one cell allocated per type. Of course, in practice there will be many more of each type, so the effective overhead is quite a bit smaller than that in practice. I left a few types unconverted to this mechanism because I got tired of doing this. :^)
144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Realm.h>
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#include <LibJS/Runtime/VM.h>
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#include <LibWasm/Types.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/WebAssembly/Table.h>
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#include <LibWeb/WebAssembly/WebAssembly.h>
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namespace Web::WebAssembly {
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JS_DEFINE_ALLOCATOR(Table);
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static Wasm::ValueType table_kind_to_value_type(Bindings::TableKind kind)
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{
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switch (kind) {
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case Bindings::TableKind::Externref:
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return Wasm::ValueType { Wasm::ValueType::ExternReference };
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case Bindings::TableKind::Anyfunc:
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return Wasm::ValueType { Wasm::ValueType::FunctionReference };
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}
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VERIFY_NOT_REACHED();
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}
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static JS::ThrowCompletionOr<Wasm::Value> value_to_reference(JS::VM& vm, JS::Value value, Wasm::ValueType const& reference_type)
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{
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if (value.is_undefined())
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return Wasm::Value(reference_type, 0ull);
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return Detail::to_webassembly_value(vm, value, reference_type);
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}
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Table>> Table::construct_impl(JS::Realm& realm, TableDescriptor& descriptor, JS::Value value)
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{
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auto& vm = realm.vm();
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auto reference_type = table_kind_to_value_type(descriptor.element);
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auto reference_value = TRY(value_to_reference(vm, value, reference_type));
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Wasm::Limits limits { descriptor.initial, move(descriptor.maximum) };
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Wasm::TableType table_type { reference_type, move(limits) };
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auto address = Detail::s_abstract_machine.store().allocate(table_type);
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if (!address.has_value())
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return vm.throw_completion<JS::TypeError>("Wasm Table allocation failed"sv);
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auto const& reference = reference_value.value().get<Wasm::Reference>();
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auto& table = *Detail::s_abstract_machine.store().get(*address);
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for (auto& element : table.elements())
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element = reference;
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return vm.heap().allocate<Table>(realm, realm, *address);
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}
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Table::Table(JS::Realm& realm, Wasm::TableAddress address)
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: Bindings::PlatformObject(realm)
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, m_address(address)
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{
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}
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void Table::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::TablePrototype>(realm, "WebAssembly.Table"sv));
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}
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// https://webassembly.github.io/spec/js-api/#dom-table-grow
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WebIDL::ExceptionOr<u32> Table::grow(u32 delta, JS::Value value)
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{
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auto& vm = this->vm();
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auto* table = Detail::s_abstract_machine.store().get(address());
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if (!table)
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return vm.throw_completion<JS::RangeError>("Could not find the memory table to grow"sv);
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auto initial_size = table->elements().size();
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auto reference_value = TRY(value_to_reference(vm, value, table->type().element_type()));
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auto const& reference = reference_value.value().get<Wasm::Reference>();
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if (!table->grow(delta, reference))
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return vm.throw_completion<JS::RangeError>("Failed to grow table"sv);
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return initial_size;
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}
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// https://webassembly.github.io/spec/js-api/#dom-table-get
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WebIDL::ExceptionOr<JS::Value> Table::get(u32 index) const
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{
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auto& vm = this->vm();
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auto* table = Detail::s_abstract_machine.store().get(address());
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if (!table)
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return vm.throw_completion<JS::RangeError>("Could not find the memory table"sv);
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if (table->elements().size() <= index)
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return vm.throw_completion<JS::RangeError>("Table element index out of range"sv);
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auto& ref = table->elements()[index];
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if (!ref.has_value())
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return JS::js_undefined();
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Wasm::Value wasm_value { ref.value() };
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return Detail::to_js_value(vm, wasm_value);
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}
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// https://webassembly.github.io/spec/js-api/#dom-table-set
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WebIDL::ExceptionOr<void> Table::set(u32 index, JS::Value value)
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{
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auto& vm = this->vm();
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auto* table = Detail::s_abstract_machine.store().get(address());
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if (!table)
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return vm.throw_completion<JS::RangeError>("Could not find the memory table"sv);
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if (table->elements().size() <= index)
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return vm.throw_completion<JS::RangeError>("Table element index out of range"sv);
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auto reference_value = TRY(value_to_reference(vm, value, table->type().element_type()));
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auto const& reference = reference_value.value().get<Wasm::Reference>();
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table->elements()[index] = reference;
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return {};
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}
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// https://webassembly.github.io/spec/js-api/#dom-table-length
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WebIDL::ExceptionOr<u32> Table::length() const
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{
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auto& vm = this->vm();
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auto* table = Detail::s_abstract_machine.store().get(address());
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if (!table)
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return vm.throw_completion<JS::RangeError>("Could not find the memory table"sv);
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return table->elements().size();
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}
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}
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