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AST.cpp
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AST.cpp
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/*
* Copyright (c) 2020, Andreas Kling <[email protected]>
* Copyright (c) 2020-2021, Linus Groh <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Demangle.h>
#include <AK/HashMap.h>
#include <AK/HashTable.h>
#include <AK/ScopeGuard.h>
#include <AK/StringBuilder.h>
#include <AK/TemporaryChange.h>
#include <LibCrypto/BigInt/SignedBigInteger.h>
#include <LibJS/AST.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Accessor.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/BigInt.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
#include <LibJS/Runtime/MarkedValueList.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/ScriptFunction.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/WithScope.h>
#include <typeinfo>
namespace JS {
class InterpreterNodeScope {
AK_MAKE_NONCOPYABLE(InterpreterNodeScope);
AK_MAKE_NONMOVABLE(InterpreterNodeScope);
public:
InterpreterNodeScope(Interpreter& interpreter, const ASTNode& node)
: m_interpreter(interpreter)
, m_chain_node { nullptr, node }
{
m_interpreter.vm().call_frame().current_node = &node;
m_interpreter.push_ast_node(m_chain_node);
}
~InterpreterNodeScope()
{
m_interpreter.pop_ast_node();
}
private:
Interpreter& m_interpreter;
ExecutingASTNodeChain m_chain_node;
};
String ASTNode::class_name() const
{
// NOTE: We strip the "JS::" prefix.
return demangle(typeid(*this).name()).substring(4);
}
static void update_function_name(Value value, const FlyString& name)
{
if (!value.is_function())
return;
auto& function = value.as_function();
if (is<ScriptFunction>(function) && function.name().is_empty())
static_cast<ScriptFunction&>(function).set_name(name);
}
static String get_function_name(GlobalObject& global_object, Value value)
{
if (value.is_symbol())
return String::formatted("[{}]", value.as_symbol().description());
if (value.is_string())
return value.as_string().string();
return value.to_string(global_object);
}
Value ScopeNode::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return interpreter.execute_statement(global_object, *this);
}
Value Program::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return interpreter.execute_statement(global_object, *this, ScopeType::Block);
}
Value FunctionDeclaration::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return {};
}
Value FunctionExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return ScriptFunction::create(global_object, name(), body(), parameters(), function_length(), interpreter.current_scope(), is_strict_mode() || interpreter.vm().in_strict_mode(), m_is_arrow_function);
}
Value ExpressionStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return m_expression->execute(interpreter, global_object);
}
CallExpression::ThisAndCallee CallExpression::compute_this_and_callee(Interpreter& interpreter, GlobalObject& global_object) const
{
auto& vm = interpreter.vm();
if (is<NewExpression>(*this)) {
// Computing |this| is irrelevant for "new" expression.
return { js_undefined(), m_callee->execute(interpreter, global_object) };
}
if (is<SuperExpression>(*m_callee)) {
// If we are calling super, |this| has not been initialized yet, and would not be meaningful to provide.
auto new_target = vm.get_new_target();
VERIFY(new_target.is_function());
return { js_undefined(), new_target };
}
if (is<MemberExpression>(*m_callee)) {
auto& member_expression = static_cast<const MemberExpression&>(*m_callee);
Value callee;
Object* this_value = nullptr;
if (is<SuperExpression>(member_expression.object())) {
auto super_base = interpreter.current_environment()->get_super_base();
if (super_base.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPrototypeNullOrUndefinedOnSuperPropertyAccess, super_base.to_string_without_side_effects());
return {};
}
auto property_name = member_expression.computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
auto reference = Reference(super_base, property_name);
callee = reference.get(global_object);
if (vm.exception())
return {};
this_value = &vm.this_value(global_object).as_object();
} else {
auto reference = member_expression.to_reference(interpreter, global_object);
if (vm.exception())
return {};
callee = reference.get(global_object);
if (vm.exception())
return {};
this_value = reference.base().to_object(global_object);
if (vm.exception())
return {};
}
return { this_value, callee };
}
return { &global_object, m_callee->execute(interpreter, global_object) };
}
Value CallExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
auto [this_value, callee] = compute_this_and_callee(interpreter, global_object);
if (vm.exception())
return {};
VERIFY(!callee.is_empty());
if (!callee.is_function()
|| (is<NewExpression>(*this) && (is<NativeFunction>(callee.as_object()) && !static_cast<NativeFunction&>(callee.as_object()).has_constructor()))) {
String error_message;
auto call_type = is<NewExpression>(*this) ? "constructor" : "function";
if (is<Identifier>(*m_callee) || is<MemberExpression>(*m_callee)) {
String expression_string;
if (is<Identifier>(*m_callee)) {
expression_string = static_cast<const Identifier&>(*m_callee).string();
} else {
expression_string = static_cast<const MemberExpression&>(*m_callee).to_string_approximation();
}
vm.throw_exception<TypeError>(global_object, ErrorType::IsNotAEvaluatedFrom, callee.to_string_without_side_effects(), call_type, expression_string);
} else {
vm.throw_exception<TypeError>(global_object, ErrorType::IsNotA, callee.to_string_without_side_effects(), call_type);
}
return {};
}
auto& function = callee.as_function();
MarkedValueList arguments(vm.heap());
arguments.ensure_capacity(m_arguments.size());
for (auto& argument : m_arguments) {
auto value = argument.value->execute(interpreter, global_object);
if (vm.exception())
return {};
if (argument.is_spread) {
get_iterator_values(global_object, value, [&](Value iterator_value) {
if (vm.exception())
return IterationDecision::Break;
arguments.append(iterator_value);
return IterationDecision::Continue;
});
if (vm.exception())
return {};
} else {
arguments.append(value);
}
}
vm.call_frame().current_node = interpreter.current_node();
Object* new_object = nullptr;
Value result;
if (is<NewExpression>(*this)) {
result = vm.construct(function, function, move(arguments), global_object);
if (result.is_object())
new_object = &result.as_object();
} else if (is<SuperExpression>(*m_callee)) {
// FIXME: This is merely a band-aid to make super() inside catch {} work (which constructs
// a new LexicalEnvironment without current function). Implement GetSuperConstructor()
// and subsequently GetThisEnvironment() instead.
auto* function_environment = interpreter.current_environment();
if (!function_environment->current_function())
function_environment = static_cast<LexicalEnvironment*>(function_environment->parent());
auto* super_constructor = function_environment->current_function()->prototype();
// FIXME: Functions should track their constructor kind.
if (!super_constructor || !super_constructor->is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, "Super constructor");
return {};
}
result = vm.construct(static_cast<Function&>(*super_constructor), function, move(arguments), global_object);
if (vm.exception())
return {};
function_environment->bind_this_value(global_object, result);
} else {
result = vm.call(function, this_value, move(arguments));
}
if (vm.exception())
return {};
if (is<NewExpression>(*this)) {
if (result.is_object())
return result;
return new_object;
}
return result;
}
Value ReturnStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto value = argument() ? argument()->execute(interpreter, global_object) : js_undefined();
if (interpreter.exception())
return {};
interpreter.vm().unwind(ScopeType::Function);
return value;
}
Value IfStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto predicate_result = m_predicate->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (predicate_result.to_boolean())
return interpreter.execute_statement(global_object, *m_consequent);
if (m_alternate)
return interpreter.execute_statement(global_object, *m_alternate);
return js_undefined();
}
Value WithStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto object_value = m_object->execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto* object = object_value.to_object(global_object);
if (interpreter.exception())
return {};
VERIFY(object);
auto* with_scope = interpreter.heap().allocate<WithScope>(global_object, *object, interpreter.vm().call_frame().scope);
TemporaryChange<ScopeObject*> scope_change(interpreter.vm().call_frame().scope, with_scope);
interpreter.execute_statement(global_object, m_body);
return {};
}
Value WhileStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto last_value = js_undefined();
for (;;) {
auto test_result = m_test->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!test_result.to_boolean())
break;
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
break;
} else {
return last_value;
}
}
}
return last_value;
}
Value DoWhileStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto last_value = js_undefined();
for (;;) {
if (interpreter.exception())
return {};
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
break;
} else {
return last_value;
}
}
auto test_result = m_test->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!test_result.to_boolean())
break;
}
return last_value;
}
Value ForStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
RefPtr<BlockStatement> wrapper;
if (m_init && is<VariableDeclaration>(*m_init) && static_cast<const VariableDeclaration&>(*m_init).declaration_kind() != DeclarationKind::Var) {
wrapper = create_ast_node<BlockStatement>(source_range());
NonnullRefPtrVector<VariableDeclaration> decls;
decls.append(*static_cast<const VariableDeclaration*>(m_init.ptr()));
wrapper->add_variables(decls);
interpreter.enter_scope(*wrapper, ScopeType::Block, global_object);
}
auto wrapper_cleanup = ScopeGuard([&] {
if (wrapper)
interpreter.exit_scope(*wrapper);
});
auto last_value = js_undefined();
if (m_init) {
m_init->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
if (m_test) {
while (true) {
auto test_result = m_test->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!test_result.to_boolean())
break;
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
break;
} else {
return last_value;
}
}
if (m_update) {
m_update->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
}
} else {
while (true) {
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
break;
} else {
return last_value;
}
}
if (m_update) {
m_update->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
}
}
return last_value;
}
static FlyString variable_from_for_declaration(Interpreter& interpreter, GlobalObject& global_object, const ASTNode& node, RefPtr<BlockStatement> wrapper)
{
FlyString variable_name;
if (is<VariableDeclaration>(node)) {
auto& variable_declaration = static_cast<const VariableDeclaration&>(node);
VERIFY(!variable_declaration.declarations().is_empty());
if (variable_declaration.declaration_kind() != DeclarationKind::Var) {
wrapper = create_ast_node<BlockStatement>(node.source_range());
interpreter.enter_scope(*wrapper, ScopeType::Block, global_object);
}
variable_declaration.execute(interpreter, global_object);
variable_name = variable_declaration.declarations().first().id().string();
} else if (is<Identifier>(node)) {
variable_name = static_cast<const Identifier&>(node).string();
} else {
VERIFY_NOT_REACHED();
}
return variable_name;
}
Value ForInStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
bool has_declaration = is<VariableDeclaration>(*m_lhs);
if (!has_declaration && !is<Identifier>(*m_lhs)) {
// FIXME: Implement "for (foo.bar in baz)", "for (foo[0] in bar)"
VERIFY_NOT_REACHED();
}
RefPtr<BlockStatement> wrapper;
auto variable_name = variable_from_for_declaration(interpreter, global_object, m_lhs, wrapper);
auto wrapper_cleanup = ScopeGuard([&] {
if (wrapper)
interpreter.exit_scope(*wrapper);
});
auto last_value = js_undefined();
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (rhs_result.is_nullish())
return {};
auto* object = rhs_result.to_object(global_object);
while (object) {
auto property_names = object->get_enumerable_own_property_names(Object::PropertyKind::Key);
for (auto& value : property_names) {
interpreter.vm().set_variable(variable_name, value, global_object, has_declaration);
if (interpreter.exception())
return {};
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
break;
} else {
return last_value;
}
}
}
object = object->prototype();
if (interpreter.exception())
return {};
}
return last_value;
}
Value ForOfStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
bool has_declaration = is<VariableDeclaration>(*m_lhs);
if (!has_declaration && !is<Identifier>(*m_lhs)) {
// FIXME: Implement "for (foo.bar of baz)", "for (foo[0] of bar)"
VERIFY_NOT_REACHED();
}
RefPtr<BlockStatement> wrapper;
auto variable_name = variable_from_for_declaration(interpreter, global_object, m_lhs, wrapper);
auto wrapper_cleanup = ScopeGuard([&] {
if (wrapper)
interpreter.exit_scope(*wrapper);
});
auto last_value = js_undefined();
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
get_iterator_values(global_object, rhs_result, [&](Value value) {
interpreter.vm().set_variable(variable_name, value, global_object, has_declaration);
last_value = interpreter.execute_statement(global_object, *m_body).value_or(last_value);
if (interpreter.exception())
return IterationDecision::Break;
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
interpreter.vm().stop_unwind();
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
return IterationDecision::Break;
} else {
return IterationDecision::Break;
}
}
return IterationDecision::Continue;
});
if (interpreter.exception())
return {};
return last_value;
}
Value BinaryExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
switch (m_op) {
case BinaryOp::Addition:
return add(global_object, lhs_result, rhs_result);
case BinaryOp::Subtraction:
return sub(global_object, lhs_result, rhs_result);
case BinaryOp::Multiplication:
return mul(global_object, lhs_result, rhs_result);
case BinaryOp::Division:
return div(global_object, lhs_result, rhs_result);
case BinaryOp::Modulo:
return mod(global_object, lhs_result, rhs_result);
case BinaryOp::Exponentiation:
return exp(global_object, lhs_result, rhs_result);
case BinaryOp::TypedEquals:
return Value(strict_eq(lhs_result, rhs_result));
case BinaryOp::TypedInequals:
return Value(!strict_eq(lhs_result, rhs_result));
case BinaryOp::AbstractEquals:
return Value(abstract_eq(global_object, lhs_result, rhs_result));
case BinaryOp::AbstractInequals:
return Value(!abstract_eq(global_object, lhs_result, rhs_result));
case BinaryOp::GreaterThan:
return greater_than(global_object, lhs_result, rhs_result);
case BinaryOp::GreaterThanEquals:
return greater_than_equals(global_object, lhs_result, rhs_result);
case BinaryOp::LessThan:
return less_than(global_object, lhs_result, rhs_result);
case BinaryOp::LessThanEquals:
return less_than_equals(global_object, lhs_result, rhs_result);
case BinaryOp::BitwiseAnd:
return bitwise_and(global_object, lhs_result, rhs_result);
case BinaryOp::BitwiseOr:
return bitwise_or(global_object, lhs_result, rhs_result);
case BinaryOp::BitwiseXor:
return bitwise_xor(global_object, lhs_result, rhs_result);
case BinaryOp::LeftShift:
return left_shift(global_object, lhs_result, rhs_result);
case BinaryOp::RightShift:
return right_shift(global_object, lhs_result, rhs_result);
case BinaryOp::UnsignedRightShift:
return unsigned_right_shift(global_object, lhs_result, rhs_result);
case BinaryOp::In:
return in(global_object, lhs_result, rhs_result);
case BinaryOp::InstanceOf:
return instance_of(global_object, lhs_result, rhs_result);
}
VERIFY_NOT_REACHED();
}
Value LogicalExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
switch (m_op) {
case LogicalOp::And:
if (lhs_result.to_boolean()) {
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
return rhs_result;
}
return lhs_result;
case LogicalOp::Or: {
if (lhs_result.to_boolean())
return lhs_result;
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
return rhs_result;
}
case LogicalOp::NullishCoalescing:
if (lhs_result.is_nullish()) {
auto rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
return rhs_result;
}
return lhs_result;
}
VERIFY_NOT_REACHED();
}
Reference Expression::to_reference(Interpreter&, GlobalObject&) const
{
return {};
}
Reference Identifier::to_reference(Interpreter& interpreter, GlobalObject&) const
{
return interpreter.vm().get_reference(string());
}
Reference MemberExpression::to_reference(Interpreter& interpreter, GlobalObject& global_object) const
{
auto object_value = m_object->execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto property_name = computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
return { object_value, property_name };
}
Value UnaryExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
if (m_op == UnaryOp::Delete) {
auto reference = m_lhs->to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
if (reference.is_unresolvable())
return Value(true);
// FIXME: Support deleting locals
VERIFY(!reference.is_local_variable());
if (reference.is_global_variable())
return Value(global_object.delete_property(reference.name()));
auto* base_object = reference.base().to_object(global_object);
if (!base_object)
return {};
return Value(base_object->delete_property(reference.name()));
}
Value lhs_result;
if (m_op == UnaryOp::Typeof && is<Identifier>(*m_lhs)) {
auto reference = m_lhs->to_reference(interpreter, global_object);
if (interpreter.exception()) {
return {};
}
// FIXME: standard recommends checking with is_unresolvable but it ALWAYS return false here
if (reference.is_local_variable() || reference.is_global_variable()) {
const auto& name = reference.name();
lhs_result = interpreter.vm().get_variable(name.to_string(), global_object).value_or(js_undefined());
if (interpreter.exception())
return {};
}
} else {
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
switch (m_op) {
case UnaryOp::BitwiseNot:
return bitwise_not(global_object, lhs_result);
case UnaryOp::Not:
return Value(!lhs_result.to_boolean());
case UnaryOp::Plus:
return unary_plus(global_object, lhs_result);
case UnaryOp::Minus:
return unary_minus(global_object, lhs_result);
case UnaryOp::Typeof:
return js_string(vm, lhs_result.typeof());
case UnaryOp::Void:
return js_undefined();
case UnaryOp::Delete:
VERIFY_NOT_REACHED();
}
VERIFY_NOT_REACHED();
}
Value SuperExpression::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// The semantics for SuperExpressions are handled in CallExpression::compute_this_and_callee()
VERIFY_NOT_REACHED();
}
Value ClassMethod::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return m_function->execute(interpreter, global_object);
}
Value ClassExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
Value class_constructor_value = m_constructor->execute(interpreter, global_object);
if (interpreter.exception())
return {};
update_function_name(class_constructor_value, m_name);
VERIFY(class_constructor_value.is_function() && is<ScriptFunction>(class_constructor_value.as_function()));
auto* class_constructor = static_cast<ScriptFunction*>(&class_constructor_value.as_function());
class_constructor->set_is_class_constructor();
Value super_constructor = js_undefined();
if (!m_super_class.is_null()) {
super_constructor = m_super_class->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!super_constructor.is_function() && !super_constructor.is_null()) {
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::ClassExtendsValueNotAConstructorOrNull, super_constructor.to_string_without_side_effects());
return {};
}
class_constructor->set_constructor_kind(Function::ConstructorKind::Derived);
Object* prototype = Object::create_empty(global_object);
Object* super_constructor_prototype = nullptr;
if (!super_constructor.is_null()) {
auto super_constructor_prototype_value = super_constructor.as_object().get(vm.names.prototype).value_or(js_undefined());
if (interpreter.exception())
return {};
if (!super_constructor_prototype_value.is_object() && !super_constructor_prototype_value.is_null()) {
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::ClassExtendsValueInvalidPrototype, super_constructor_prototype_value.to_string_without_side_effects());
return {};
}
if (super_constructor_prototype_value.is_object())
super_constructor_prototype = &super_constructor_prototype_value.as_object();
}
prototype->set_prototype(super_constructor_prototype);
prototype->define_property(vm.names.constructor, class_constructor, 0);
if (interpreter.exception())
return {};
class_constructor->define_property(vm.names.prototype, prototype, Attribute::Writable);
if (interpreter.exception())
return {};
class_constructor->set_prototype(super_constructor.is_null() ? global_object.function_prototype() : &super_constructor.as_object());
}
auto class_prototype = class_constructor->get(vm.names.prototype);
if (interpreter.exception())
return {};
if (!class_prototype.is_object()) {
interpreter.vm().throw_exception<TypeError>(global_object, ErrorType::NotAnObject, "Class prototype");
return {};
}
for (const auto& method : m_methods) {
auto method_value = method.execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto& method_function = method_value.as_function();
auto key = method.key().execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto& target = method.is_static() ? *class_constructor : class_prototype.as_object();
method_function.set_home_object(&target);
switch (method.kind()) {
case ClassMethod::Kind::Method:
target.define_property(StringOrSymbol::from_value(global_object, key), method_value);
break;
case ClassMethod::Kind::Getter:
update_function_name(method_value, String::formatted("get {}", get_function_name(global_object, key)));
target.define_accessor(StringOrSymbol::from_value(global_object, key), &method_function, nullptr, Attribute::Configurable | Attribute::Enumerable);
break;
case ClassMethod::Kind::Setter:
update_function_name(method_value, String::formatted("set {}", get_function_name(global_object, key)));
target.define_accessor(StringOrSymbol::from_value(global_object, key), nullptr, &method_function, Attribute::Configurable | Attribute::Enumerable);
break;
default:
VERIFY_NOT_REACHED();
}
if (interpreter.exception())
return {};
}
return class_constructor;
}
Value ClassDeclaration::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
Value class_constructor = m_class_expression->execute(interpreter, global_object);
if (interpreter.exception())
return {};
interpreter.current_scope()->put_to_scope(m_class_expression->name(), { class_constructor, DeclarationKind::Let });
return {};
}
static void print_indent(int indent)
{
out("{}", String::repeated(' ', indent * 2));
}
void ASTNode::dump(int indent) const
{
print_indent(indent);
outln("{}", class_name());
}
void ScopeNode::dump(int indent) const
{
ASTNode::dump(indent);
if (!m_variables.is_empty()) {
print_indent(indent + 1);
outln("(Variables)");
for (auto& variable : m_variables)
variable.dump(indent + 2);
}
if (!m_children.is_empty()) {
print_indent(indent + 1);
outln("(Children)");
for (auto& child : children())
child.dump(indent + 2);
}
}
void BinaryExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case BinaryOp::Addition:
op_string = "+";
break;
case BinaryOp::Subtraction:
op_string = "-";
break;
case BinaryOp::Multiplication:
op_string = "*";
break;
case BinaryOp::Division:
op_string = "/";
break;
case BinaryOp::Modulo:
op_string = "%";
break;
case BinaryOp::Exponentiation:
op_string = "**";
break;
case BinaryOp::TypedEquals:
op_string = "===";
break;
case BinaryOp::TypedInequals:
op_string = "!==";
break;
case BinaryOp::AbstractEquals:
op_string = "==";
break;
case BinaryOp::AbstractInequals:
op_string = "!=";
break;
case BinaryOp::GreaterThan:
op_string = ">";
break;
case BinaryOp::GreaterThanEquals:
op_string = ">=";
break;
case BinaryOp::LessThan:
op_string = "<";
break;
case BinaryOp::LessThanEquals:
op_string = "<=";
break;
case BinaryOp::BitwiseAnd:
op_string = "&";
break;
case BinaryOp::BitwiseOr:
op_string = "|";
break;
case BinaryOp::BitwiseXor:
op_string = "^";
break;
case BinaryOp::LeftShift:
op_string = "<<";
break;
case BinaryOp::RightShift:
op_string = ">>";
break;
case BinaryOp::UnsignedRightShift:
op_string = ">>>";
break;
case BinaryOp::In:
op_string = "in";
break;
case BinaryOp::InstanceOf:
op_string = "instanceof";
break;
}
print_indent(indent);
outln("{}", class_name());
m_lhs->dump(indent + 1);
print_indent(indent + 1);
outln("{}", op_string);
m_rhs->dump(indent + 1);
}
void LogicalExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case LogicalOp::And:
op_string = "&&";
break;
case LogicalOp::Or:
op_string = "||";
break;
case LogicalOp::NullishCoalescing:
op_string = "??";
break;
}
print_indent(indent);
outln("{}", class_name());
m_lhs->dump(indent + 1);
print_indent(indent + 1);
outln("{}", op_string);
m_rhs->dump(indent + 1);
}
void UnaryExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case UnaryOp::BitwiseNot:
op_string = "~";
break;
case UnaryOp::Not:
op_string = "!";
break;
case UnaryOp::Plus:
op_string = "+";
break;
case UnaryOp::Minus:
op_string = "-";
break;