5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
365 lines
12 KiB
C++
365 lines
12 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/ScopeGuard.h>
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#include <AK/StringBuilder.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Reference.h>
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#include <LibJS/Runtime/ScriptFunction.h>
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#include <LibJS/Runtime/Symbol.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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NonnullRefPtr<VM> VM::create()
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{
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return adopt(*new VM);
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}
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VM::VM()
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: m_heap(*this)
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{
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m_empty_string = m_heap.allocate_without_global_object<PrimitiveString>(String::empty());
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for (size_t i = 0; i < 128; ++i) {
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m_single_ascii_character_strings[i] = m_heap.allocate_without_global_object<PrimitiveString>(String::formatted("{:c}", i));
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}
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m_scope_object_shape = m_heap.allocate_without_global_object<Shape>(Shape::ShapeWithoutGlobalObjectTag::Tag);
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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m_well_known_symbol_##snake_name = js_symbol(*this, "Symbol." #SymbolName, false);
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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}
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VM::~VM()
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{
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}
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Interpreter& VM::interpreter()
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{
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VERIFY(!m_interpreters.is_empty());
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return *m_interpreters.last();
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}
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Interpreter* VM::interpreter_if_exists()
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{
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if (m_interpreters.is_empty())
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return nullptr;
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return m_interpreters.last();
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}
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void VM::push_interpreter(Interpreter& interpreter)
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{
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m_interpreters.append(&interpreter);
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}
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void VM::pop_interpreter(Interpreter& interpreter)
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{
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VERIFY(!m_interpreters.is_empty());
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auto* popped_interpreter = m_interpreters.take_last();
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VERIFY(popped_interpreter == &interpreter);
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}
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VM::InterpreterExecutionScope::InterpreterExecutionScope(Interpreter& interpreter)
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: m_interpreter(interpreter)
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{
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m_interpreter.vm().push_interpreter(m_interpreter);
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}
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VM::InterpreterExecutionScope::~InterpreterExecutionScope()
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{
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m_interpreter.vm().pop_interpreter(m_interpreter);
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}
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void VM::gather_roots(HashTable<Cell*>& roots)
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{
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roots.set(m_empty_string);
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for (auto* string : m_single_ascii_character_strings)
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roots.set(string);
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roots.set(m_scope_object_shape);
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roots.set(m_exception);
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if (m_last_value.is_cell())
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roots.set(m_last_value.as_cell());
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for (auto& call_frame : m_call_stack) {
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if (call_frame->this_value.is_cell())
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roots.set(call_frame->this_value.as_cell());
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roots.set(call_frame->arguments_object);
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for (auto& argument : call_frame->arguments) {
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if (argument.is_cell())
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roots.set(argument.as_cell());
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}
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roots.set(call_frame->scope);
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}
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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roots.set(well_known_symbol_##snake_name());
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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for (auto& symbol : m_global_symbol_map)
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roots.set(symbol.value);
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}
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Symbol* VM::get_global_symbol(const String& description)
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{
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auto result = m_global_symbol_map.get(description);
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if (result.has_value())
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return result.value();
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auto new_global_symbol = js_symbol(*this, description, true);
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m_global_symbol_map.set(description, new_global_symbol);
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return new_global_symbol;
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}
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void VM::set_variable(const FlyString& name, Value value, GlobalObject& global_object, bool first_assignment)
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{
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if (m_call_stack.size()) {
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for (auto* scope = current_scope(); scope; scope = scope->parent()) {
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auto possible_match = scope->get_from_scope(name);
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if (possible_match.has_value()) {
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if (!first_assignment && possible_match.value().declaration_kind == DeclarationKind::Const) {
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throw_exception<TypeError>(global_object, ErrorType::InvalidAssignToConst);
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return;
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}
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scope->put_to_scope(name, { value, possible_match.value().declaration_kind });
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return;
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}
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}
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}
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global_object.put(move(name), move(value));
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}
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Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
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{
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if (m_call_stack.size()) {
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if (name == names.arguments) {
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// HACK: Special handling for the name "arguments":
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// If the name "arguments" is defined in the current scope, for example via
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// a function parameter, or by a local var declaration, we use that.
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// Otherwise, we return a lazily constructed Array with all the argument values.
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// FIXME: Do something much more spec-compliant.
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auto possible_match = current_scope()->get_from_scope(name);
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if (possible_match.has_value())
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return possible_match.value().value;
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if (!call_frame().arguments_object) {
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call_frame().arguments_object = Array::create(global_object);
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for (auto argument : call_frame().arguments) {
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call_frame().arguments_object->indexed_properties().append(argument);
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}
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}
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return call_frame().arguments_object;
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}
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for (auto* scope = current_scope(); scope; scope = scope->parent()) {
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auto possible_match = scope->get_from_scope(name);
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if (possible_match.has_value())
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return possible_match.value().value;
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}
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}
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auto value = global_object.get(name);
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if (m_underscore_is_last_value && name == "_" && value.is_empty())
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return m_last_value;
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return value;
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}
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Reference VM::get_reference(const FlyString& name)
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{
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if (m_call_stack.size()) {
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for (auto* scope = current_scope(); scope; scope = scope->parent()) {
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if (is<GlobalObject>(scope))
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break;
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auto possible_match = scope->get_from_scope(name);
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if (possible_match.has_value())
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return { Reference::LocalVariable, name };
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}
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}
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return { Reference::GlobalVariable, name };
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}
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Value VM::construct(Function& function, Function& new_target, Optional<MarkedValueList> arguments, GlobalObject& global_object)
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{
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CallFrame call_frame;
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call_frame.is_strict_mode = function.is_strict_mode();
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push_call_frame(call_frame, function.global_object());
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if (exception())
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return {};
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ArmedScopeGuard call_frame_popper = [&] {
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pop_call_frame();
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};
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call_frame.function_name = function.name();
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call_frame.arguments = function.bound_arguments();
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if (arguments.has_value())
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call_frame.arguments.append(arguments.value().values());
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auto* environment = function.create_environment();
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call_frame.scope = environment;
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environment->set_new_target(&new_target);
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Object* new_object = nullptr;
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if (function.constructor_kind() == Function::ConstructorKind::Base) {
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new_object = Object::create_empty(global_object);
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environment->bind_this_value(global_object, new_object);
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if (exception())
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return {};
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auto prototype = new_target.get(names.prototype);
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if (exception())
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return {};
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if (prototype.is_object()) {
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new_object->set_prototype(&prototype.as_object());
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if (exception())
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return {};
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}
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}
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// If we are a Derived constructor, |this| has not been constructed before super is called.
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Value this_value = function.constructor_kind() == Function::ConstructorKind::Base ? new_object : Value {};
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call_frame.this_value = this_value;
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auto result = function.construct(new_target);
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this_value = call_frame.scope->get_this_binding(global_object);
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pop_call_frame();
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call_frame_popper.disarm();
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// If we are constructing an instance of a derived class,
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// set the prototype on objects created by constructors that return an object (i.e. NativeFunction subclasses).
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if (function.constructor_kind() == Function::ConstructorKind::Base && new_target.constructor_kind() == Function::ConstructorKind::Derived && result.is_object()) {
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VERIFY(is<LexicalEnvironment>(current_scope()));
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static_cast<LexicalEnvironment*>(current_scope())->replace_this_binding(result);
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auto prototype = new_target.get(names.prototype);
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if (exception())
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return {};
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if (prototype.is_object()) {
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result.as_object().set_prototype(&prototype.as_object());
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if (exception())
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return {};
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}
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return result;
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}
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if (exception())
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return {};
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if (result.is_object())
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return result;
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return this_value;
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}
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void VM::throw_exception(Exception* exception)
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{
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if (should_log_exceptions() && exception->value().is_object() && is<Error>(exception->value().as_object())) {
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auto& error = static_cast<Error&>(exception->value().as_object());
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dbgln("Throwing JavaScript Error: {}, {}", error.name(), error.message());
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for (ssize_t i = m_call_stack.size() - 1; i >= 0; --i) {
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auto function_name = m_call_stack[i]->function_name;
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if (function_name.is_empty())
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function_name = "<anonymous>";
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dbgln(" {}", function_name);
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}
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}
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m_exception = exception;
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unwind(ScopeType::Try);
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}
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String VM::join_arguments() const
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{
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StringBuilder joined_arguments;
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for (size_t i = 0; i < argument_count(); ++i) {
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joined_arguments.append(argument(i).to_string_without_side_effects().characters());
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if (i != argument_count() - 1)
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joined_arguments.append(' ');
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}
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return joined_arguments.build();
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}
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Value VM::resolve_this_binding(GlobalObject& global_object) const
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{
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return find_this_scope()->get_this_binding(global_object);
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}
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const ScopeObject* VM::find_this_scope() const
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{
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// We will always return because the Global environment will always be reached, which has a |this| binding.
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for (auto* scope = current_scope(); scope; scope = scope->parent()) {
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if (scope->has_this_binding())
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return scope;
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}
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VERIFY_NOT_REACHED();
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}
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Value VM::get_new_target() const
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{
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VERIFY(is<LexicalEnvironment>(find_this_scope()));
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return static_cast<const LexicalEnvironment*>(find_this_scope())->new_target();
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}
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Value VM::call_internal(Function& function, Value this_value, Optional<MarkedValueList> arguments)
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{
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VERIFY(!exception());
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CallFrame call_frame;
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call_frame.is_strict_mode = function.is_strict_mode();
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call_frame.function_name = function.name();
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call_frame.this_value = function.bound_this().value_or(this_value);
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call_frame.arguments = function.bound_arguments();
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if (arguments.has_value())
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call_frame.arguments.append(move(arguments.release_value().values()));
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auto* environment = function.create_environment();
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call_frame.scope = environment;
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VERIFY(environment->this_binding_status() == LexicalEnvironment::ThisBindingStatus::Uninitialized);
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environment->bind_this_value(function.global_object(), call_frame.this_value);
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if (exception())
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return {};
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push_call_frame(call_frame, function.global_object());
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if (exception())
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return {};
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auto result = function.call();
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pop_call_frame();
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return result;
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}
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bool VM::in_strict_mode() const
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{
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if (call_stack().is_empty())
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return false;
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return call_frame().is_strict_mode;
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}
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}
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