631 lines
26 KiB
C++
631 lines
26 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@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 <AK/Enumerate.h>
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#include <LibWasm/AbstractMachine/AbstractMachine.h>
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#include <LibWasm/AbstractMachine/BytecodeInterpreter.h>
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#include <LibWasm/AbstractMachine/Configuration.h>
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#include <LibWasm/AbstractMachine/Interpreter.h>
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#include <LibWasm/AbstractMachine/Validator.h>
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#include <LibWasm/Types.h>
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namespace Wasm {
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Optional<FunctionAddress> Store::allocate(ModuleInstance& module, Module::Function const& function)
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{
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FunctionAddress address { m_functions.size() };
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if (function.type().value() > module.types().size())
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return {};
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auto& type = module.types()[function.type().value()];
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m_functions.empend(WasmFunction { type, module, function });
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return address;
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}
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Optional<FunctionAddress> Store::allocate(HostFunction&& function)
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{
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FunctionAddress address { m_functions.size() };
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m_functions.empend(HostFunction { move(function) });
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return address;
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}
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Optional<TableAddress> Store::allocate(TableType const& type)
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{
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TableAddress address { m_tables.size() };
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Vector<Reference> elements;
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elements.resize(type.limits().min());
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m_tables.empend(TableInstance { type, move(elements) });
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return address;
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}
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Optional<MemoryAddress> Store::allocate(MemoryType const& type)
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{
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MemoryAddress address { m_memories.size() };
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auto instance = MemoryInstance::create(type);
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if (instance.is_error())
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return {};
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m_memories.append(instance.release_value());
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return address;
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}
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Optional<GlobalAddress> Store::allocate(GlobalType const& type, Value value)
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{
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GlobalAddress address { m_globals.size() };
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m_globals.append(GlobalInstance { move(value), type.is_mutable() });
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return address;
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}
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Optional<DataAddress> Store::allocate_data(Vector<u8> initializer)
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{
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DataAddress address { m_datas.size() };
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m_datas.append(DataInstance { move(initializer) });
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return address;
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}
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Optional<ElementAddress> Store::allocate(ValueType const& type, Vector<Reference> references)
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{
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ElementAddress address { m_elements.size() };
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m_elements.append(ElementInstance { type, move(references) });
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return address;
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}
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FunctionInstance* Store::get(FunctionAddress address)
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{
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auto value = address.value();
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if (m_functions.size() <= value)
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return nullptr;
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return &m_functions[value];
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}
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TableInstance* Store::get(TableAddress address)
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{
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auto value = address.value();
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if (m_tables.size() <= value)
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return nullptr;
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return &m_tables[value];
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}
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MemoryInstance* Store::get(MemoryAddress address)
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{
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auto value = address.value();
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if (m_memories.size() <= value)
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return nullptr;
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return &m_memories[value];
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}
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GlobalInstance* Store::get(GlobalAddress address)
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{
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auto value = address.value();
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if (m_globals.size() <= value)
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return nullptr;
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return &m_globals[value];
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}
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ElementInstance* Store::get(ElementAddress address)
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{
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auto value = address.value();
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if (m_elements.size() <= value)
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return nullptr;
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return &m_elements[value];
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}
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DataInstance* Store::get(DataAddress address)
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{
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auto value = address.value();
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if (m_datas.size() <= value)
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return nullptr;
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return &m_datas[value];
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}
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ErrorOr<void, ValidationError> AbstractMachine::validate(Module& module)
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{
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if (module.validation_status() != Module::ValidationStatus::Unchecked) {
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if (module.validation_status() == Module::ValidationStatus::Valid)
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return {};
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return ValidationError { module.validation_error() };
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}
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auto result = Validator {}.validate(module);
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if (result.is_error()) {
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module.set_validation_error(result.error().error_string);
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return result.release_error();
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}
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return {};
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}
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InstantiationResult AbstractMachine::instantiate(Module const& module, Vector<ExternValue> externs)
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{
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if (auto result = validate(const_cast<Module&>(module)); result.is_error())
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return InstantiationError { ByteString::formatted("Validation failed: {}", result.error()) };
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auto main_module_instance_pointer = make<ModuleInstance>();
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auto& main_module_instance = *main_module_instance_pointer;
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Optional<InstantiationResult> instantiation_result;
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module.for_each_section_of_type<TypeSection>([&](TypeSection const& section) {
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main_module_instance.types() = section.types();
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});
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Vector<Value> global_values;
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Vector<Vector<Reference>> elements;
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ModuleInstance auxiliary_instance;
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module.for_each_section_of_type<ImportSection>([&](ImportSection const& section) {
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for (auto [i, import_] : enumerate(section.imports())) {
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auto extern_ = externs.at(i);
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auto is_valid = import_.description().visit(
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[&](MemoryType const& mem_type) -> bool {
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if (!extern_.has<MemoryAddress>())
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return false;
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auto other_mem_type = m_store.get(extern_.get<MemoryAddress>())->type();
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return other_mem_type.limits().is_subset_of(mem_type.limits());
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},
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[&](TableType const& table_type) -> bool {
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if (!extern_.has<TableAddress>())
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return false;
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auto other_table_type = m_store.get(extern_.get<TableAddress>())->type();
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return table_type.element_type() == other_table_type.element_type()
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&& other_table_type.limits().is_subset_of(table_type.limits());
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},
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[&](GlobalType const& global_type) -> bool {
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if (!extern_.has<GlobalAddress>())
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return false;
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auto other_global_type = m_store.get(extern_.get<GlobalAddress>())->type();
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return global_type.type() == other_global_type.type()
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&& global_type.is_mutable() == other_global_type.is_mutable();
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},
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[&](FunctionType const& type) -> bool {
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if (!extern_.has<FunctionAddress>())
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return false;
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auto other_type = m_store.get(extern_.get<FunctionAddress>())->visit([&](WasmFunction const& wasm_func) { return wasm_func.type(); }, [&](HostFunction const& host_func) { return host_func.type(); });
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return type.results() == other_type.results()
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&& type.parameters() == other_type.parameters();
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},
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[&](TypeIndex type_index) -> bool {
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if (!extern_.has<FunctionAddress>())
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return false;
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auto other_type = m_store.get(extern_.get<FunctionAddress>())->visit([&](WasmFunction const& wasm_func) { return wasm_func.type(); }, [&](HostFunction const& host_func) { return host_func.type(); });
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auto& type = module.type(type_index);
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return type.results() == other_type.results()
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&& type.parameters() == other_type.parameters();
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});
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if (!is_valid)
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instantiation_result = InstantiationError { "Import and extern do not match" };
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}
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});
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if (instantiation_result.has_value())
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return instantiation_result.release_value();
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for (auto& entry : externs) {
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if (auto* ptr = entry.get_pointer<GlobalAddress>())
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auxiliary_instance.globals().append(*ptr);
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}
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Vector<FunctionAddress> module_functions;
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module_functions.ensure_capacity(module.functions().size());
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for (auto& func : module.functions()) {
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auto address = m_store.allocate(main_module_instance, func);
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VERIFY(address.has_value());
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auxiliary_instance.functions().append(*address);
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module_functions.append(*address);
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}
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BytecodeInterpreter interpreter(m_stack_info);
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module.for_each_section_of_type<GlobalSection>([&](auto& global_section) {
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for (auto& entry : global_section.entries()) {
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Configuration config { m_store };
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if (m_should_limit_instruction_count)
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config.enable_instruction_count_limit();
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config.set_frame(Frame {
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auxiliary_instance,
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Vector<Value> {},
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entry.expression(),
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1,
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});
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auto result = config.execute(interpreter).assert_wasm_result();
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if (result.is_trap())
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instantiation_result = InstantiationError { ByteString::formatted("Global value construction trapped: {}", result.trap().reason) };
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else
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global_values.append(result.values().first());
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}
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});
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if (instantiation_result.has_value())
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return instantiation_result.release_value();
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if (auto result = allocate_all_initial_phase(module, main_module_instance, externs, global_values, module_functions); result.has_value())
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return result.release_value();
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module.for_each_section_of_type<ElementSection>([&](ElementSection const& section) {
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for (auto& segment : section.segments()) {
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Vector<Reference> references;
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for (auto& entry : segment.init) {
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Configuration config { m_store };
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if (m_should_limit_instruction_count)
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config.enable_instruction_count_limit();
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config.set_frame(Frame {
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main_module_instance,
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Vector<Value> {},
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entry,
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entry.instructions().size(),
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});
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auto result = config.execute(interpreter).assert_wasm_result();
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if (result.is_trap()) {
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instantiation_result = InstantiationError { ByteString::formatted("Element construction trapped: {}", result.trap().reason) };
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return IterationDecision::Continue;
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}
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for (auto& value : result.values()) {
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if (!value.type().is_reference()) {
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instantiation_result = InstantiationError { "Evaluated element entry is not a reference" };
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return IterationDecision::Continue;
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}
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auto reference = value.to<Reference>();
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if (!reference.has_value()) {
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instantiation_result = InstantiationError { "Evaluated element entry does not contain a reference" };
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return IterationDecision::Continue;
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}
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// FIXME: type-check the reference.
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references.prepend(reference.release_value());
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}
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}
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elements.append(move(references));
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}
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return IterationDecision::Continue;
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});
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if (instantiation_result.has_value())
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return instantiation_result.release_value();
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if (auto result = allocate_all_final_phase(module, main_module_instance, elements); result.has_value())
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return result.release_value();
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module.for_each_section_of_type<ElementSection>([&](ElementSection const& section) {
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size_t index = 0;
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for (auto& segment : section.segments()) {
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auto current_index = index;
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++index;
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auto active_ptr = segment.mode.get_pointer<ElementSection::Active>();
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if (!active_ptr)
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continue;
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Configuration config { m_store };
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if (m_should_limit_instruction_count)
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config.enable_instruction_count_limit();
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config.set_frame(Frame {
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main_module_instance,
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Vector<Value> {},
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active_ptr->expression,
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1,
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});
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auto result = config.execute(interpreter).assert_wasm_result();
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if (result.is_trap()) {
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instantiation_result = InstantiationError { ByteString::formatted("Element section initialisation trapped: {}", result.trap().reason) };
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return IterationDecision::Break;
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}
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auto d = result.values().first().to<i32>();
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if (!d.has_value()) {
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instantiation_result = InstantiationError { "Element section initialisation returned invalid table initial offset" };
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return IterationDecision::Break;
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}
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auto table_instance = m_store.get(main_module_instance.tables()[active_ptr->index.value()]);
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if (current_index >= main_module_instance.elements().size()) {
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instantiation_result = InstantiationError { "Invalid element referenced by active element segment" };
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return IterationDecision::Break;
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}
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auto elem_instance = m_store.get(main_module_instance.elements()[current_index]);
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if (!table_instance || !elem_instance) {
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instantiation_result = InstantiationError { "Invalid element referenced by active element segment" };
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return IterationDecision::Break;
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}
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Checked<size_t> total_size = elem_instance->references().size();
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total_size.saturating_add(d.value());
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if (total_size.value() > table_instance->elements().size()) {
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instantiation_result = InstantiationError { "Table instantiation out of bounds" };
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return IterationDecision::Break;
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}
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size_t i = 0;
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for (auto it = elem_instance->references().begin(); it < elem_instance->references().end(); ++i, ++it) {
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table_instance->elements()[i + d.value()] = *it;
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}
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}
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return IterationDecision::Continue;
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});
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if (instantiation_result.has_value())
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return instantiation_result.release_value();
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module.for_each_section_of_type<DataSection>([&](DataSection const& data_section) {
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for (auto& segment : data_section.data()) {
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segment.value().visit(
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[&](DataSection::Data::Active const& data) {
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Configuration config { m_store };
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if (m_should_limit_instruction_count)
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config.enable_instruction_count_limit();
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config.set_frame(Frame {
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main_module_instance,
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Vector<Value> {},
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data.offset,
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1,
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});
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auto result = config.execute(interpreter).assert_wasm_result();
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if (result.is_trap()) {
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instantiation_result = InstantiationError { ByteString::formatted("Data section initialisation trapped: {}", result.trap().reason) };
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return;
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}
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size_t offset = 0;
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result.values().first().value().visit(
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[&](auto const& value) { offset = value; },
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[&](u128 const&) { instantiation_result = InstantiationError { "Data segment offset returned a vector type"sv }; },
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[&](Reference const&) { instantiation_result = InstantiationError { "Data segment offset returned a reference"sv }; });
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if (instantiation_result.has_value() && instantiation_result->is_error())
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return;
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if (main_module_instance.memories().size() <= data.index.value()) {
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instantiation_result = InstantiationError {
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ByteString::formatted("Data segment referenced out-of-bounds memory ({}) of max {} entries",
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data.index.value(), main_module_instance.memories().size())
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};
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return;
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}
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auto maybe_data_address = m_store.allocate_data(data.init);
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if (!maybe_data_address.has_value()) {
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instantiation_result = InstantiationError { "Failed to allocate a data instance for an active data segment"sv };
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return;
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}
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main_module_instance.datas().append(*maybe_data_address);
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if (data.init.is_empty())
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return;
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auto address = main_module_instance.memories()[data.index.value()];
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auto instance = m_store.get(address);
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Checked<size_t> checked_offset = data.init.size();
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checked_offset += offset;
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if (checked_offset.has_overflow() || checked_offset > instance->size()) {
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instantiation_result = InstantiationError {
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ByteString::formatted("Data segment attempted to write to out-of-bounds memory ({}) in memory of size {}",
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offset, instance->size())
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};
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return;
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}
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instance->data().overwrite(offset, data.init.data(), data.init.size());
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},
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[&](DataSection::Data::Passive const& passive) {
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auto maybe_data_address = m_store.allocate_data(passive.init);
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if (!maybe_data_address.has_value()) {
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instantiation_result = InstantiationError { "Failed to allocate a data instance for a passive data segment"sv };
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return;
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}
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main_module_instance.datas().append(*maybe_data_address);
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});
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}
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});
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module.for_each_section_of_type<StartSection>([&](StartSection const& section) {
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auto& functions = main_module_instance.functions();
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auto index = section.function().index();
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if (functions.size() <= index.value()) {
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instantiation_result = InstantiationError { ByteString::formatted("Start section function referenced invalid index {} of max {} entries", index.value(), functions.size()) };
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return;
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}
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invoke(functions[index.value()], {});
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});
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if (instantiation_result.has_value())
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return instantiation_result.release_value();
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return InstantiationResult { move(main_module_instance_pointer) };
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}
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Optional<InstantiationError> AbstractMachine::allocate_all_initial_phase(Module const& module, ModuleInstance& module_instance, Vector<ExternValue>& externs, Vector<Value>& global_values, Vector<FunctionAddress>& own_functions)
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{
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Optional<InstantiationError> result;
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for (auto& entry : externs) {
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entry.visit(
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[&](FunctionAddress const& address) { module_instance.functions().append(address); },
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[&](TableAddress const& address) { module_instance.tables().append(address); },
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[&](MemoryAddress const& address) { module_instance.memories().append(address); },
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[&](GlobalAddress const& address) { module_instance.globals().append(address); });
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}
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module_instance.functions().extend(own_functions);
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// FIXME: What if this fails?
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module.for_each_section_of_type<TableSection>([&](TableSection const& section) {
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for (auto& table : section.tables()) {
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auto table_address = m_store.allocate(table.type());
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VERIFY(table_address.has_value());
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module_instance.tables().append(*table_address);
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}
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});
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module.for_each_section_of_type<MemorySection>([&](MemorySection const& section) {
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for (auto& memory : section.memories()) {
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auto memory_address = m_store.allocate(memory.type());
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VERIFY(memory_address.has_value());
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module_instance.memories().append(*memory_address);
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}
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});
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module.for_each_section_of_type<GlobalSection>([&](GlobalSection const& section) {
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size_t index = 0;
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for (auto& entry : section.entries()) {
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auto address = m_store.allocate(entry.type(), move(global_values[index]));
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VERIFY(address.has_value());
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module_instance.globals().append(*address);
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index++;
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}
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});
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module.for_each_section_of_type<ExportSection>([&](ExportSection const& section) {
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for (auto& entry : section.entries()) {
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Variant<FunctionAddress, TableAddress, MemoryAddress, GlobalAddress, Empty> address {};
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entry.description().visit(
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[&](FunctionIndex const& index) {
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if (module_instance.functions().size() > index.value())
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address = FunctionAddress { module_instance.functions()[index.value()] };
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else
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dbgln("Failed to export '{}', the exported address ({}) was out of bounds (min: 0, max: {})", entry.name(), index.value(), module_instance.functions().size());
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},
|
|
[&](TableIndex const& index) {
|
|
if (module_instance.tables().size() > index.value())
|
|
address = TableAddress { module_instance.tables()[index.value()] };
|
|
else
|
|
dbgln("Failed to export '{}', the exported address ({}) was out of bounds (min: 0, max: {})", entry.name(), index.value(), module_instance.tables().size());
|
|
},
|
|
[&](MemoryIndex const& index) {
|
|
if (module_instance.memories().size() > index.value())
|
|
address = MemoryAddress { module_instance.memories()[index.value()] };
|
|
else
|
|
dbgln("Failed to export '{}', the exported address ({}) was out of bounds (min: 0, max: {})", entry.name(), index.value(), module_instance.memories().size());
|
|
},
|
|
[&](GlobalIndex const& index) {
|
|
if (module_instance.globals().size() > index.value())
|
|
address = GlobalAddress { module_instance.globals()[index.value()] };
|
|
else
|
|
dbgln("Failed to export '{}', the exported address ({}) was out of bounds (min: 0, max: {})", entry.name(), index.value(), module_instance.globals().size());
|
|
});
|
|
|
|
if (address.has<Empty>()) {
|
|
result = InstantiationError { "An export could not be resolved" };
|
|
continue;
|
|
}
|
|
|
|
module_instance.exports().append(ExportInstance {
|
|
entry.name(),
|
|
move(address).downcast<FunctionAddress, TableAddress, MemoryAddress, GlobalAddress>(),
|
|
});
|
|
}
|
|
});
|
|
|
|
return result;
|
|
}
|
|
|
|
Optional<InstantiationError> AbstractMachine::allocate_all_final_phase(Module const& module, ModuleInstance& module_instance, Vector<Vector<Reference>>& elements)
|
|
{
|
|
module.for_each_section_of_type<ElementSection>([&](ElementSection const& section) {
|
|
size_t index = 0;
|
|
for (auto& segment : section.segments()) {
|
|
auto address = m_store.allocate(segment.type, move(elements[index]));
|
|
VERIFY(address.has_value());
|
|
module_instance.elements().append(*address);
|
|
index++;
|
|
}
|
|
});
|
|
|
|
return {};
|
|
}
|
|
|
|
Result AbstractMachine::invoke(FunctionAddress address, Vector<Value> arguments)
|
|
{
|
|
BytecodeInterpreter interpreter(m_stack_info);
|
|
return invoke(interpreter, address, move(arguments));
|
|
}
|
|
|
|
Result AbstractMachine::invoke(Interpreter& interpreter, FunctionAddress address, Vector<Value> arguments)
|
|
{
|
|
Configuration configuration { m_store };
|
|
if (m_should_limit_instruction_count)
|
|
configuration.enable_instruction_count_limit();
|
|
return configuration.call(interpreter, address, move(arguments));
|
|
}
|
|
|
|
void Linker::link(ModuleInstance const& instance)
|
|
{
|
|
populate();
|
|
if (m_unresolved_imports.is_empty())
|
|
return;
|
|
|
|
HashTable<Name> resolved_imports;
|
|
for (auto& import_ : m_unresolved_imports) {
|
|
auto it = instance.exports().find_if([&](auto& export_) { return export_.name() == import_.name; });
|
|
if (!it.is_end()) {
|
|
resolved_imports.set(import_);
|
|
m_resolved_imports.set(import_, it->value());
|
|
}
|
|
}
|
|
|
|
for (auto& entry : resolved_imports)
|
|
m_unresolved_imports.remove(entry);
|
|
}
|
|
|
|
void Linker::link(HashMap<Linker::Name, ExternValue> const& exports)
|
|
{
|
|
populate();
|
|
if (m_unresolved_imports.is_empty())
|
|
return;
|
|
|
|
if (exports.is_empty())
|
|
return;
|
|
|
|
HashTable<Name> resolved_imports;
|
|
for (auto& import_ : m_unresolved_imports) {
|
|
auto export_ = exports.get(import_);
|
|
if (export_.has_value()) {
|
|
resolved_imports.set(import_);
|
|
m_resolved_imports.set(import_, export_.value());
|
|
}
|
|
}
|
|
|
|
for (auto& entry : resolved_imports)
|
|
m_unresolved_imports.remove(entry);
|
|
}
|
|
|
|
AK::ErrorOr<Vector<ExternValue>, LinkError> Linker::finish()
|
|
{
|
|
populate();
|
|
if (!m_unresolved_imports.is_empty()) {
|
|
if (!m_error.has_value())
|
|
m_error = LinkError {};
|
|
for (auto& entry : m_unresolved_imports)
|
|
m_error->missing_imports.append(entry.name);
|
|
return *m_error;
|
|
}
|
|
|
|
if (m_error.has_value())
|
|
return *m_error;
|
|
|
|
// Result must be in the same order as the module imports
|
|
Vector<ExternValue> exports;
|
|
exports.ensure_capacity(m_ordered_imports.size());
|
|
for (auto& import_ : m_ordered_imports)
|
|
exports.unchecked_append(*m_resolved_imports.get(import_));
|
|
return exports;
|
|
}
|
|
|
|
void Linker::populate()
|
|
{
|
|
if (!m_ordered_imports.is_empty())
|
|
return;
|
|
|
|
// There better be at most one import section!
|
|
bool already_seen_an_import_section = false;
|
|
m_module.for_each_section_of_type<ImportSection>([&](ImportSection const& section) {
|
|
if (already_seen_an_import_section) {
|
|
if (!m_error.has_value())
|
|
m_error = LinkError {};
|
|
m_error->other_errors.append(LinkError::InvalidImportedModule);
|
|
return;
|
|
}
|
|
already_seen_an_import_section = true;
|
|
for (auto& import_ : section.imports()) {
|
|
m_ordered_imports.append({ import_.module(), import_.name(), import_.description() });
|
|
m_unresolved_imports.set(m_ordered_imports.last());
|
|
}
|
|
});
|
|
}
|
|
|
|
}
|