64da05a96d
This implements the memory object cache and its "reset on grow" semantics, as the web depends on the exact behaviour.
110 lines
3.6 KiB
C++
110 lines
3.6 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/Memory.h>
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#include <LibWeb/WebAssembly/WebAssembly.h>
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namespace Web::WebAssembly {
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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 = MUST_OR_THROW_OOM(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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JS::ThrowCompletionOr<void> Memory::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Base::initialize(realm));
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set_prototype(&Bindings::ensure_web_prototype<Bindings::MemoryPrototype>(realm, "WebAssembly.Memory"sv));
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return {};
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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, MUST_OR_THROW_OOM(JS::PrimitiveString::create(vm, "WebAssembly.Memory"sv))));
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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(MUST_OR_THROW_OOM(JS::PrimitiveString::create(vm, "WebAssembly.Memory"sv)));
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return JS::NonnullGCPtr(*array_buffer);
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}
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}
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