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38dfd04633
Many other parsers call it with this name. Also Type can be confusing in this context since the DeclarationType is not the type (number, string, etc.) of the variables that are being declared by the VariableDeclaration.
240 lines
8 KiB
C++
240 lines
8 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/Badge.h>
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#include <LibJS/AST.h>
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/ArrayPrototype.h>
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#include <LibJS/Runtime/BooleanPrototype.h>
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#include <LibJS/Runtime/DatePrototype.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/ErrorPrototype.h>
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#include <LibJS/Runtime/FunctionPrototype.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NativeFunction.h>
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#include <LibJS/Runtime/NumberPrototype.h>
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#include <LibJS/Runtime/Object.h>
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#include <LibJS/Runtime/ObjectPrototype.h>
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#include <LibJS/Runtime/Shape.h>
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#include <LibJS/Runtime/StringPrototype.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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Interpreter::Interpreter()
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: m_heap(*this)
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{
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m_empty_object_shape = heap().allocate<Shape>();
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m_object_prototype = heap().allocate<ObjectPrototype>();
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m_function_prototype = heap().allocate<FunctionPrototype>();
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m_string_prototype = heap().allocate<StringPrototype>();
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m_array_prototype = heap().allocate<ArrayPrototype>();
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m_error_prototype = heap().allocate<ErrorPrototype>();
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m_date_prototype = heap().allocate<DatePrototype>();
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m_number_prototype = heap().allocate<NumberPrototype>();
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m_boolean_prototype = heap().allocate<BooleanPrototype>();
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}
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Interpreter::~Interpreter()
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{
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}
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Value Interpreter::run(const Statement& statement, ArgumentVector arguments, ScopeType scope_type)
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{
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if (!statement.is_scope_node())
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return statement.execute(*this);
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auto& block = static_cast<const ScopeNode&>(statement);
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enter_scope(block, move(arguments), scope_type);
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m_last_value = js_undefined();
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for (auto& node : block.children()) {
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m_last_value = node.execute(*this);
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if (m_unwind_until != ScopeType::None)
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break;
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}
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bool did_return = m_unwind_until == ScopeType::Function;
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if (m_unwind_until == scope_type)
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m_unwind_until = ScopeType::None;
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exit_scope(block);
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return did_return ? m_last_value : js_undefined();
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}
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void Interpreter::enter_scope(const ScopeNode& scope_node, ArgumentVector arguments, ScopeType scope_type)
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{
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HashMap<FlyString, Variable> scope_variables_with_declaration_kind;
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for (auto& argument : arguments) {
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scope_variables_with_declaration_kind.set(argument.name, { argument.value, DeclarationKind::Var });
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}
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m_scope_stack.append({ scope_type, scope_node, move(scope_variables_with_declaration_kind) });
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}
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void Interpreter::exit_scope(const ScopeNode& scope_node)
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{
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while (!m_scope_stack.is_empty()) {
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auto popped_scope = m_scope_stack.take_last();
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if (popped_scope.scope_node.ptr() == &scope_node)
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break;
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}
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// If we unwind all the way, just reset m_unwind_until so that future "return" doesn't break.
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if (m_scope_stack.is_empty())
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m_unwind_until = ScopeType::None;
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}
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void Interpreter::declare_variable(const FlyString& name, DeclarationKind declaration_kind)
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{
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switch (declaration_kind) {
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case DeclarationKind::Var:
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for (ssize_t i = m_scope_stack.size() - 1; i >= 0; --i) {
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auto& scope = m_scope_stack.at(i);
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if (scope.type == ScopeType::Function) {
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if (scope.variables.get(name).has_value() && scope.variables.get(name).value().declaration_kind != DeclarationKind::Var)
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ASSERT_NOT_REACHED();
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scope.variables.set(move(name), { js_undefined(), declaration_kind });
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return;
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}
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}
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global_object().put(move(name), js_undefined());
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break;
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case DeclarationKind::Let:
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case DeclarationKind::Const:
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if (m_scope_stack.last().variables.get(name).has_value())
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ASSERT_NOT_REACHED();
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m_scope_stack.last().variables.set(move(name), { js_undefined(), declaration_kind });
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break;
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}
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}
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void Interpreter::set_variable(const FlyString& name, Value value, bool first_assignment)
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{
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for (ssize_t i = m_scope_stack.size() - 1; i >= 0; --i) {
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auto& scope = m_scope_stack.at(i);
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auto possible_match = scope.variables.get(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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ASSERT_NOT_REACHED();
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scope.variables.set(move(name), { move(value), possible_match.value().declaration_kind });
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return;
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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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Optional<Value> Interpreter::get_variable(const FlyString& name)
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{
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if (name == "this")
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return this_value();
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for (ssize_t i = m_scope_stack.size() - 1; i >= 0; --i) {
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auto& scope = m_scope_stack.at(i);
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auto value = scope.variables.get(name);
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if (value.has_value())
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return value.value().value;
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}
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return global_object().get(name);
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}
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void Interpreter::gather_roots(Badge<Heap>, HashTable<Cell*>& roots)
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{
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roots.set(m_empty_object_shape);
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roots.set(m_global_object);
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roots.set(m_string_prototype);
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roots.set(m_object_prototype);
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roots.set(m_array_prototype);
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roots.set(m_error_prototype);
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roots.set(m_date_prototype);
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roots.set(m_function_prototype);
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roots.set(m_number_prototype);
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roots.set(m_boolean_prototype);
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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& scope : m_scope_stack) {
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for (auto& it : scope.variables) {
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if (it.value.value.is_cell())
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roots.set(it.value.value.as_cell());
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}
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}
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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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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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}
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}
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Value Interpreter::call(Function* function, Value this_value, const Vector<Value>& arguments)
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{
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auto& call_frame = push_call_frame();
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call_frame.this_value = this_value;
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call_frame.arguments = arguments;
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auto result = function->call(*this);
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pop_call_frame();
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return result;
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}
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Value Interpreter::throw_exception(Exception* exception)
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{
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if (exception->value().is_object() && exception->value().as_object().is_error()) {
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auto& error = static_cast<Error&>(exception->value().as_object());
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dbg() << "Throwing JavaScript Error: " << error.name() << ", " << error.message();
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}
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m_exception = exception;
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unwind(ScopeType::Try);
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return {};
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}
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GlobalObject& Interpreter::global_object()
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{
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return static_cast<GlobalObject&>(*m_global_object);
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}
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const GlobalObject& Interpreter::global_object() const
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{
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return static_cast<const GlobalObject&>(*m_global_object);
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}
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}
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