mirror of
https://github.com/RGBCube/serenity
synced 2025-05-14 14:24:57 +00:00
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. :^)
110 lines
3.5 KiB
C++
110 lines
3.5 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/Memory.h>
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#include <LibWeb/WebAssembly/WebAssembly.h>
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namespace Web::WebAssembly {
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JS_DEFINE_ALLOCATOR(Memory);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<Memory>> Memory::construct_impl(JS::Realm& realm, MemoryDescriptor& descriptor)
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{
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auto& vm = realm.vm();
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Wasm::Limits limits { descriptor.initial, move(descriptor.maximum) };
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Wasm::MemoryType memory_type { move(limits) };
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auto address = Detail::s_abstract_machine.store().allocate(memory_type);
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if (!address.has_value())
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return vm.throw_completion<JS::TypeError>("Wasm Memory allocation failed"sv);
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auto memory_object = vm.heap().allocate<Memory>(realm, realm, *address);
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Detail::s_abstract_machine.store().get(*address)->successful_grow_hook = [memory_object] {
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MUST(memory_object->reset_the_memory_buffer());
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};
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return memory_object;
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}
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Memory::Memory(JS::Realm& realm, Wasm::MemoryAddress 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 Memory::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::MemoryPrototype>(realm, "WebAssembly.Memory"sv));
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}
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// https://webassembly.github.io/spec/js-api/#dom-memory-grow
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WebIDL::ExceptionOr<u32> Memory::grow(u32 delta)
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{
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auto& vm = this->vm();
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auto* memory = Detail::s_abstract_machine.store().get(address());
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if (!memory)
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return vm.throw_completion<JS::RangeError>("Could not find the memory instance to grow"sv);
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auto previous_size = memory->size() / Wasm::Constants::page_size;
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if (!memory->grow(delta * Wasm::Constants::page_size, Wasm::MemoryInstance::InhibitGrowCallback::Yes))
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return vm.throw_completion<JS::RangeError>("Memory.grow() grows past the stated limit of the memory instance"sv);
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TRY(reset_the_memory_buffer());
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return previous_size;
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}
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// https://webassembly.github.io/spec/js-api/#reset-the-memory-buffer
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WebIDL::ExceptionOr<void> Memory::reset_the_memory_buffer()
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{
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if (!m_buffer)
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return {};
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auto& vm = this->vm();
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auto& realm = *vm.current_realm();
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MUST(JS::detach_array_buffer(vm, *m_buffer, JS::PrimitiveString::create(vm, "WebAssembly.Memory"_string)));
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auto buffer = TRY(create_a_memory_buffer(vm, realm, m_address));
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m_buffer = buffer;
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return {};
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}
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// https://webassembly.github.io/spec/js-api/#dom-memory-buffer
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::ArrayBuffer>> Memory::buffer() const
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{
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auto& vm = this->vm();
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auto& realm = *vm.current_realm();
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if (!m_buffer)
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m_buffer = TRY(create_a_memory_buffer(vm, realm, m_address));
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return JS::NonnullGCPtr(*m_buffer);
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}
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// https://webassembly.github.io/spec/js-api/#create-a-memory-buffer
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::ArrayBuffer>> Memory::create_a_memory_buffer(JS::VM& vm, JS::Realm& realm, Wasm::MemoryAddress address)
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{
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auto* memory = Detail::s_abstract_machine.store().get(address);
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if (!memory)
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return vm.throw_completion<JS::RangeError>("Could not find the memory instance"sv);
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auto array_buffer = JS::ArrayBuffer::create(realm, &memory->data());
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array_buffer->set_detach_key(JS::PrimitiveString::create(vm, "WebAssembly.Memory"_string));
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return JS::NonnullGCPtr(*array_buffer);
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}
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}
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