/*
* Copyright (c) 2020-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
*
* 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/AbstractOperations.h>
#include <LibJS/Runtime/Accessor.h>
#include <LibJS/Runtime/Array.h>
#include <LibJS/Runtime/BigInt.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/FunctionEnvironment.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/IteratorOperations.h>
#include <LibJS/Runtime/MarkedValueList.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/ObjectEnvironment.h>
#include <LibJS/Runtime/OrdinaryFunctionObject.h>
#include <LibJS/Runtime/PrimitiveString.h>
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/RegExpObject.h>
#include <LibJS/Runtime/Shape.h>
#include <typeinfo>
namespace JS {
class InterpreterNodeScope {
AK_MAKE_NONCOPYABLE(InterpreterNodeScope);
AK_MAKE_NONMOVABLE(InterpreterNodeScope);
public:
InterpreterNodeScope(Interpreter& interpreter, ASTNode const& node)
: m_interpreter(interpreter)
, m_chain_node { nullptr, node }
{
m_interpreter.vm().running_execution_context().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, FlyString const& name)
{
if (!value.is_function())
return;
auto& function = value.as_function();
if (is<OrdinaryFunctionObject>(function) && function.name().is_empty())
static_cast<OrdinaryFunctionObject&>(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 {};
}
// 15.2.5 Runtime Semantics: InstantiateOrdinaryFunctionExpression, https://tc39.es/ecma262/#sec-runtime-semantics-instantiateordinaryfunctionexpression
Value FunctionExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto* func_env = interpreter.lexical_environment();
bool has_identifier = !name().is_empty() && !is_auto_renamed();
if (has_identifier) {
func_env = interpreter.heap().allocate<DeclarativeEnvironment>(global_object, func_env);
func_env->create_immutable_binding(global_object, name(), false);
}
auto closure = OrdinaryFunctionObject::create(global_object, name(), body(), parameters(), function_length(), func_env, kind(), is_strict_mode(), is_arrow_function());
if (has_identifier)
func_env->initialize_binding(global_object, name(), closure);
return closure;
}
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, Reference const& callee_reference) const
{
auto& vm = interpreter.vm();
if (callee_reference.is_property_reference()) {
auto this_value = callee_reference.get_this_value();
auto callee = callee_reference.get_value(global_object);
if (vm.exception())
return {};
return { this_value, callee };
}
// [[Call]] will handle that in non-strict mode the this value becomes the global object
return {
js_undefined(),
callee_reference.is_unresolvable()
? m_callee->execute(interpreter, global_object)
: callee_reference.get_value(global_object)
};
}
// 13.3.8.1 Runtime Semantics: ArgumentListEvaluation, https://tc39.es/ecma262/#sec-runtime-semantics-argumentlistevaluation
static void argument_list_evaluation(Interpreter& interpreter, GlobalObject& global_object, Vector<CallExpression::Argument> const& arguments, MarkedValueList& list)
{
auto& vm = global_object.vm();
list.ensure_capacity(arguments.size());
for (auto& argument : 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;
list.append(iterator_value);
return IterationDecision::Continue;
});
if (vm.exception())
return;
} else {
list.append(value);
}
}
}
Value NewExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
auto callee_value = m_callee->execute(interpreter, global_object);
if (vm.exception())
return {};
if (!callee_value.is_function() || (is<NativeFunction>(callee_value.as_object()) && !static_cast<NativeFunction&>(callee_value.as_object()).has_constructor())) {
throw_type_error_for_callee(interpreter, global_object, callee_value, "constructor"sv);
return {};
}
MarkedValueList arg_list(vm.heap());
argument_list_evaluation(interpreter, global_object, m_arguments, arg_list);
if (interpreter.exception())
return {};
auto& function = callee_value.as_function();
return vm.construct(function, function, move(arg_list));
}
void CallExpression::throw_type_error_for_callee(Interpreter& interpreter, GlobalObject& global_object, Value callee_value, StringView call_type) const
{
auto& vm = interpreter.vm();
if (is<Identifier>(*m_callee) || is<MemberExpression>(*m_callee)) {
String expression_string;
if (is<Identifier>(*m_callee)) {
expression_string = static_cast<Identifier const&>(*m_callee).string();
} else {
expression_string = static_cast<MemberExpression const&>(*m_callee).to_string_approximation();
}
vm.throw_exception<TypeError>(global_object, ErrorType::IsNotAEvaluatedFrom, callee_value.to_string_without_side_effects(), call_type, expression_string);
} else {
vm.throw_exception<TypeError>(global_object, ErrorType::IsNotA, callee_value.to_string_without_side_effects(), call_type);
}
}
Value CallExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
auto callee_reference = m_callee->to_reference(interpreter, global_object);
if (vm.exception())
return {};
auto [this_value, callee] = compute_this_and_callee(interpreter, global_object, callee_reference);
if (vm.exception())
return {};
VERIFY(!callee.is_empty());
MarkedValueList arg_list(vm.heap());
argument_list_evaluation(interpreter, global_object, m_arguments, arg_list);
if (interpreter.exception())
return {};
if (!callee.is_function()) {
throw_type_error_for_callee(interpreter, global_object, callee, "function"sv);
return {};
}
auto& function = callee.as_function();
if (&function == global_object.eval_function()
&& callee_reference.is_environment_reference()
&& callee_reference.name().is_string()
&& callee_reference.name().as_string() == vm.names.eval.as_string()) {
auto script_value = arg_list.size() == 0 ? js_undefined() : arg_list[0];
return perform_eval(script_value, global_object, vm.in_strict_mode() ? CallerMode::Strict : CallerMode::NonStrict, EvalMode::Direct);
}
return vm.call(function, this_value, move(arg_list));
}
// 13.3.7.1 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
// SuperCall : super Arguments
Value SuperCall::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
// 1. Let newTarget be GetNewTarget().
auto new_target = vm.get_new_target();
if (vm.exception())
return {};
// 2. Assert: Type(newTarget) is Object.
VERIFY(new_target.is_function());
// 3. Let func be ! GetSuperConstructor().
auto* func = get_super_constructor(interpreter.vm());
VERIFY(!vm.exception());
// 4. Let argList be ? ArgumentListEvaluation of Arguments.
MarkedValueList arg_list(vm.heap());
argument_list_evaluation(interpreter, global_object, m_arguments, arg_list);
if (interpreter.exception())
return {};
// 5. If IsConstructor(func) is false, throw a TypeError exception.
// FIXME: This check is non-conforming.
if (!func || !func->is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAConstructor, "Super constructor");
return {};
}
// 6. Let result be ? Construct(func, argList, newTarget).
auto& function = new_target.as_function();
auto result = vm.construct(static_cast<FunctionObject&>(*func), function, move(arg_list));
if (vm.exception())
return {};
// 7. Let thisER be GetThisEnvironment().
auto& this_er = verify_cast<FunctionEnvironment>(get_this_environment(interpreter.vm()));
// 8. Perform ? thisER.BindThisValue(result).
this_er.bind_this_value(global_object, result);
if (vm.exception())
return {};
// 9. Let F be thisER.[[FunctionObject]].
// 10. Assert: F is an ECMAScript function object. (NOTE: This is implied by the strong C++ type.)
[[maybe_unused]] auto& f = this_er.function_object();
// 11. Perform ? InitializeInstanceElements(result, F).
VERIFY(result.is_object());
vm.initialize_instance_elements(result.as_object(), f);
// 12. Return result.
return result;
}
Value YieldExpression::execute(Interpreter&, GlobalObject&) const
{
// This should be transformed to a return.
VERIFY_NOT_REACHED();
}
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();
}
// 14.11.2 Runtime Semantics: Evaluation, https://tc39.es/ecma262/#sec-with-statement-runtime-semantics-evaluation
// WithStatement : with ( Expression ) Statement
Value WithStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// 1. Let value be the result of evaluating Expression.
auto value = m_object->execute(interpreter, global_object);
if (interpreter.exception())
return {};
// 2. Let obj be ? ToObject(? GetValue(value)).
auto* object = value.to_object(global_object);
if (interpreter.exception())
return {};
// 3. Let oldEnv be the running execution context's LexicalEnvironment.
auto* old_environment = interpreter.vm().running_execution_context().lexical_environment;
// 4. Let newEnv be NewObjectEnvironment(obj, true, oldEnv).
auto* new_environment = new_object_environment(*object, true, old_environment);
if (interpreter.exception())
return {};
// 5. Set the running execution context's LexicalEnvironment to newEnv.
interpreter.vm().running_execution_context().lexical_environment = new_environment;
// 6. Let C be the result of evaluating Statement.
auto result = interpreter.execute_statement(global_object, m_body).value_or(js_undefined());
// 7. Set the running execution context's LexicalEnvironment to oldEnv.
interpreter.vm().running_execution_context().lexical_environment = old_environment;
if (interpreter.exception())
return {};
// 8. Return Completion(UpdateEmpty(C, undefined)).
return result;
}
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<VariableDeclaration const&>(*m_init).declaration_kind() != DeclarationKind::Var) {
wrapper = create_ast_node<BlockStatement>(source_range());
NonnullRefPtrVector<VariableDeclaration> decls;
decls.append(*static_cast<VariableDeclaration const*>(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 Variant<NonnullRefPtr<Identifier>, NonnullRefPtr<BindingPattern>> variable_from_for_declaration(Interpreter& interpreter, GlobalObject& global_object, ASTNode const& node, RefPtr<BlockStatement> wrapper)
{
if (is<VariableDeclaration>(node)) {
auto& variable_declaration = static_cast<VariableDeclaration const&>(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);
return variable_declaration.declarations().first().target();
}
if (is<Identifier>(node)) {
return NonnullRefPtr(static_cast<Identifier const&>(node));
}
VERIFY_NOT_REACHED();
}
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 target = 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->enumerable_own_property_names(Object::PropertyKind::Key);
for (auto& value : property_names) {
interpreter.vm().assign(target, 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->internal_get_prototype_of();
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 target = 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().assign(target, 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().resolve_binding(string());
}
Reference MemberExpression::to_reference(Interpreter& interpreter, GlobalObject& global_object) const
{
// 13.3.7.1 Runtime Semantics: Evaluation
// SuperProperty : super [ Expression ]
// SuperProperty : super . IdentifierName
// https://tc39.es/ecma262/#sec-super-keyword-runtime-semantics-evaluation
if (is<SuperExpression>(object())) {
// 1. Let env be GetThisEnvironment().
auto& environment = get_this_environment(interpreter.vm());
// 2. Let actualThis be ? env.GetThisBinding().
auto actual_this = environment.get_this_binding(global_object);
StringOrSymbol property_key;
if (is_computed()) {
// SuperProperty : super [ Expression ]
// 3. Let propertyNameReference be the result of evaluating Expression.
// 4. Let propertyNameValue be ? GetValue(propertyNameReference).
auto property_name_value = m_property->execute(interpreter, global_object);
if (interpreter.exception())
return {};
// 5. Let propertyKey be ? ToPropertyKey(propertyNameValue).
property_key = property_name_value.to_property_key(global_object);
} else {
// SuperProperty : super . IdentifierName
// 3. Let propertyKey be StringValue of IdentifierName.
VERIFY(is<Identifier>(property()));
property_key = static_cast<Identifier const&>(property()).string();
}
// 6. If the code matched by this SuperProperty is strict mode code, let strict be true; else let strict be false.
bool strict = interpreter.vm().in_strict_mode();
// 7. Return ? MakeSuperPropertyReference(actualThis, propertyKey, strict).
return make_super_property_reference(global_object, actual_this, property_key, strict);
}
auto object_value = m_object->execute(interpreter, global_object);
if (interpreter.exception())
return {};
// From here on equivalent to
// 13.3.4 EvaluatePropertyAccessWithIdentifierKey ( baseValue, identifierName, strict ), https://tc39.es/ecma262/#sec-evaluate-property-access-with-identifier-key
object_value = TRY_OR_DISCARD(require_object_coercible(global_object, object_value));
auto property_name = computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return Reference {};
auto strict = interpreter.vm().in_strict_mode();
return Reference { object_value, move(property_name), {}, strict };
}
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 {};
return Value(reference.delete_(global_object));
}
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 {};
}
if (reference.is_unresolvable()) {
lhs_result = js_undefined();
} else {
lhs_result = reference.get_value(global_object, false);
}
} 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&, GlobalObject&) const
{
// The semantics for SuperExpression are handled in CallExpression and SuperCall.
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 ClassField::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return {};
}
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<OrdinaryFunctionObject>(class_constructor_value.as_function()));
auto* class_constructor = static_cast<OrdinaryFunctionObject*>(&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(FunctionObject::ConstructorKind::Derived);
Object* super_constructor_prototype = nullptr;
if (!super_constructor.is_null()) {
auto super_constructor_prototype_value = super_constructor.as_object().get(vm.names.prototype);
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();
}
auto* prototype = Object::create(global_object, super_constructor_prototype);
prototype->define_direct_property(vm.names.constructor, class_constructor, 0);
if (interpreter.exception())
return {};
class_constructor->define_direct_property(vm.names.prototype, prototype, Attribute::Writable);
if (interpreter.exception())
return {};
class_constructor->internal_set_prototype_of(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 (auto const& 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 property_key = key.to_property_key(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_or_throw(property_key, { .value = method_value, .writable = true, .enumerable = false, .configurable = true });
break;
case ClassMethod::Kind::Getter:
update_function_name(method_value, String::formatted("get {}", get_function_name(global_object, key)));
target.define_property_or_throw(property_key, { .get = &method_function, .enumerable = true, .configurable = true });
break;
case ClassMethod::Kind::Setter:
update_function_name(method_value, String::formatted("set {}", get_function_name(global_object, key)));
target.define_property_or_throw(property_key, { .set = &method_function, .enumerable = true, .configurable = true });
break;
default:
VERIFY_NOT_REACHED();
}
if (interpreter.exception())
return {};
}
for (auto& field : m_fields) {
auto key = field.key().execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto property_key = key.to_property_key(global_object);
if (interpreter.exception())
return {};
FunctionObject* initializer = nullptr;
if (field.initializer()) {
auto copy_initializer = field.initializer();
auto body = create_ast_node<ExpressionStatement>(field.initializer()->source_range(), copy_initializer.release_nonnull());
// FIXME: A potential optimization is not creating the functions here since these are never directly accessible.
initializer = OrdinaryFunctionObject::create(interpreter.global_object(), property_key.to_display_string(), *body, {}, 0, interpreter.lexical_environment(), FunctionKind::Regular, false);
initializer->set_home_object(field.is_static() ? class_constructor : &class_prototype.as_object());
}
if (field.is_static()) {
Value field_value = js_undefined();
if (initializer) {
field_value = interpreter.vm().call(*initializer, class_constructor_value);
if (interpreter.exception())
return {};
}
class_constructor->create_data_property_or_throw(property_key, field_value);
if (interpreter.exception())
return {};
} else {
class_constructor->add_field(property_key, initializer);
}
}
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.lexical_environment()->put_into_environment(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;
case UnaryOp::Typeof:
op_string = "typeof ";
break;
case UnaryOp::Void:
op_string = "void ";
break;
case UnaryOp::Delete:
op_string = "delete ";
break;
}
print_indent(indent);
outln("{}", class_name());
print_indent(indent + 1);
outln("{}", op_string);
m_lhs->dump(indent + 1);
}
void CallExpression::dump(int indent) const
{
print_indent(indent);
if (is<NewExpression>(*this))
outln("CallExpression [new]");
else
outln("CallExpression");
m_callee->dump(indent + 1);
for (auto& argument : m_arguments)
argument.value->dump(indent + 1);
}
void SuperCall::dump(int indent) const
{
print_indent(indent);
outln("SuperCall");
for (auto& argument : m_arguments)
argument.value->dump(indent + 1);
}
void ClassDeclaration::dump(int indent) const
{
ASTNode::dump(indent);
m_class_expression->dump(indent + 1);
}
void ClassExpression::dump(int indent) const
{
print_indent(indent);
outln("ClassExpression: \"{}\"", m_name);
print_indent(indent);
outln("(Constructor)");
m_constructor->dump(indent + 1);
if (!m_super_class.is_null()) {
print_indent(indent);
outln("(Super Class)");
m_super_class->dump(indent + 1);
}
print_indent(indent);
outln("(Methods)");
for (auto& method : m_methods)
method.dump(indent + 1);
print_indent(indent);
outln("(Fields)");
for (auto& field : m_fields)
field.dump(indent + 1);
}
void ClassMethod::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("(Key)");
m_key->dump(indent + 1);
const char* kind_string = nullptr;
switch (m_kind) {
case Kind::Method:
kind_string = "Method";
break;
case Kind::Getter:
kind_string = "Getter";
break;
case Kind::Setter:
kind_string = "Setter";
break;
}
print_indent(indent);
outln("Kind: {}", kind_string);
print_indent(indent);
outln("Static: {}", m_is_static);
print_indent(indent);
outln("(Function)");
m_function->dump(indent + 1);
}
void ClassField::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("(Key)");
m_key->dump(indent + 1);
print_indent(indent);
outln("Static: {}", m_is_static);
if (m_initializer) {
print_indent(indent);
outln("(Initializer)");
m_initializer->dump(indent + 1);
}
}
void StringLiteral::dump(int indent) const
{
print_indent(indent);
outln("StringLiteral \"{}\"", m_value);
}
void SuperExpression::dump(int indent) const
{
print_indent(indent);
outln("super");
}
void NumericLiteral::dump(int indent) const
{
print_indent(indent);
outln("NumericLiteral {}", m_value);
}
void BigIntLiteral::dump(int indent) const
{
print_indent(indent);
outln("BigIntLiteral {}", m_value);
}
void BooleanLiteral::dump(int indent) const
{
print_indent(indent);
outln("BooleanLiteral {}", m_value);
}
void NullLiteral::dump(int indent) const
{
print_indent(indent);
outln("null");
}
void BindingPattern::dump(int indent) const
{
print_indent(indent);
outln("BindingPattern {}", kind == Kind::Array ? "Array" : "Object");
for (auto& entry : entries) {
print_indent(indent + 1);
outln("(Property)");
if (kind == Kind::Object) {
print_indent(indent + 2);
outln("(Identifier)");
if (entry.name.has<NonnullRefPtr<Identifier>>()) {
entry.name.get<NonnullRefPtr<Identifier>>()->dump(indent + 3);
} else {
entry.name.get<NonnullRefPtr<Expression>>()->dump(indent + 3);
}
} else if (entry.is_elision()) {
print_indent(indent + 2);
outln("(Elision)");
continue;
}
print_indent(indent + 2);
outln("(Pattern{})", entry.is_rest ? " rest=true" : "");
if (entry.alias.has<NonnullRefPtr<Identifier>>()) {
entry.alias.get<NonnullRefPtr<Identifier>>()->dump(indent + 3);
} else if (entry.alias.has<NonnullRefPtr<BindingPattern>>()) {
entry.alias.get<NonnullRefPtr<BindingPattern>>()->dump(indent + 3);
} else {
print_indent(indent + 3);
outln("<empty>");
}
if (entry.initializer) {
print_indent(indent + 2);
outln("(Initializer)");
entry.initializer->dump(indent + 3);
}
}
}
void FunctionNode::dump(int indent, String const& class_name) const
{
print_indent(indent);
outln("{}{} '{}'", class_name, m_kind == FunctionKind::Generator ? "*" : "", name());
if (!m_parameters.is_empty()) {
print_indent(indent + 1);
outln("(Parameters)");
for (auto& parameter : m_parameters) {
print_indent(indent + 2);
if (parameter.is_rest)
out("...");
parameter.binding.visit(
[&](FlyString const& name) {
outln("{}", name);
},
[&](BindingPattern const& pattern) {
pattern.dump(indent + 2);
});
if (parameter.default_value)
parameter.default_value->dump(indent + 3);
}
}
print_indent(indent + 1);
outln("(Body)");
body().dump(indent + 2);
}
void FunctionDeclaration::dump(int indent) const
{
FunctionNode::dump(indent, class_name());
}
void FunctionExpression::dump(int indent) const
{
FunctionNode::dump(indent, class_name());
}
void YieldExpression::dump(int indent) const
{
ASTNode::dump(indent);
if (argument())
argument()->dump(indent + 1);
}
void ReturnStatement::dump(int indent) const
{
ASTNode::dump(indent);
if (argument())
argument()->dump(indent + 1);
}
void IfStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("If");
predicate().dump(indent + 1);
consequent().dump(indent + 1);
if (alternate()) {
print_indent(indent);
outln("Else");
alternate()->dump(indent + 1);
}
}
void WhileStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("While");
test().dump(indent + 1);
body().dump(indent + 1);
}
void WithStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
outln("Object");
object().dump(indent + 2);
print_indent(indent + 1);
outln("Body");
body().dump(indent + 2);
}
void DoWhileStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("DoWhile");
test().dump(indent + 1);
body().dump(indent + 1);
}
void ForStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("For");
if (init())
init()->dump(indent + 1);
if (test())
test()->dump(indent + 1);
if (update())
update()->dump(indent + 1);
body().dump(indent + 1);
}
void ForInStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("ForIn");
lhs().dump(indent + 1);
rhs().dump(indent + 1);
body().dump(indent + 1);
}
void ForOfStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("ForOf");
lhs().dump(indent + 1);
rhs().dump(indent + 1);
body().dump(indent + 1);
}
Value Identifier::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto value = interpreter.vm().get_variable(string(), global_object);
if (interpreter.exception())
return {};
if (value.is_empty()) {
interpreter.vm().throw_exception<ReferenceError>(global_object, ErrorType::UnknownIdentifier, string());
return {};
}
return value;
}
void Identifier::dump(int indent) const
{
print_indent(indent);
outln("Identifier \"{}\"", m_string);
}
void SpreadExpression::dump(int indent) const
{
ASTNode::dump(indent);
m_target->dump(indent + 1);
}
Value SpreadExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return m_target->execute(interpreter, global_object);
}
Value ThisExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return interpreter.vm().resolve_this_binding(global_object);
}
void ThisExpression::dump(int indent) const
{
ASTNode::dump(indent);
}
Value AssignmentExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
#define EXECUTE_LHS() \
do { \
if (auto* ptr = m_lhs.get_pointer<NonnullRefPtr<Expression>>()) { \
lhs_result = (*ptr)->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
} \
} while (0)
#define EXECUTE_LHS_AND_RHS() \
do { \
EXECUTE_LHS(); \
rhs_result = m_rhs->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
} while (0)
Value lhs_result;
Value rhs_result;
switch (m_op) {
case AssignmentOp::Assignment:
break;
case AssignmentOp::AdditionAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = add(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::SubtractionAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = sub(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::MultiplicationAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = mul(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::DivisionAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = div(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::ModuloAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = mod(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::ExponentiationAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = exp(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::BitwiseAndAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = bitwise_and(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::BitwiseOrAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = bitwise_or(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::BitwiseXorAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = bitwise_xor(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::LeftShiftAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = left_shift(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::RightShiftAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = right_shift(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::UnsignedRightShiftAssignment:
EXECUTE_LHS_AND_RHS();
rhs_result = unsigned_right_shift(global_object, lhs_result, rhs_result);
break;
case AssignmentOp::AndAssignment:
EXECUTE_LHS();
if (!lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::OrAssignment:
EXECUTE_LHS();
if (lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::NullishAssignment:
EXECUTE_LHS();
if (!lhs_result.is_nullish())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
}
if (interpreter.exception())
return {};
return m_lhs.visit(
[&](NonnullRefPtr<Expression>& lhs) -> JS::Value {
auto reference = lhs->to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
if (m_op == AssignmentOp::Assignment) {
rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
if (reference.is_unresolvable()) {
interpreter.vm().throw_exception<ReferenceError>(global_object, ErrorType::InvalidLeftHandAssignment);
return {};
}
reference.put_value(global_object, rhs_result);
if (interpreter.exception())
return {};
return rhs_result;
},
[&](NonnullRefPtr<BindingPattern>& pattern) -> JS::Value {
VERIFY(m_op == AssignmentOp::Assignment);
rhs_result = m_rhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
interpreter.vm().assign(pattern, rhs_result, global_object);
if (interpreter.exception())
return {};
return rhs_result;
});
}
Value UpdateExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto reference = m_argument->to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
auto old_value = reference.get_value(global_object);
if (interpreter.exception())
return {};
old_value = old_value.to_numeric(global_object);
if (interpreter.exception())
return {};
Value new_value;
switch (m_op) {
case UpdateOp::Increment:
if (old_value.is_number())
new_value = Value(old_value.as_double() + 1);
else
new_value = js_bigint(interpreter.heap(), old_value.as_bigint().big_integer().plus(Crypto::SignedBigInteger { 1 }));
break;
case UpdateOp::Decrement:
if (old_value.is_number())
new_value = Value(old_value.as_double() - 1);
else
new_value = js_bigint(interpreter.heap(), old_value.as_bigint().big_integer().minus(Crypto::SignedBigInteger { 1 }));
break;
default:
VERIFY_NOT_REACHED();
}
reference.put_value(global_object, new_value);
if (interpreter.exception())
return {};
return m_prefixed ? new_value : old_value;
}
void AssignmentExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case AssignmentOp::Assignment:
op_string = "=";
break;
case AssignmentOp::AdditionAssignment:
op_string = "+=";
break;
case AssignmentOp::SubtractionAssignment:
op_string = "-=";
break;
case AssignmentOp::MultiplicationAssignment:
op_string = "*=";
break;
case AssignmentOp::DivisionAssignment:
op_string = "/=";
break;
case AssignmentOp::ModuloAssignment:
op_string = "%=";
break;
case AssignmentOp::ExponentiationAssignment:
op_string = "**=";
break;
case AssignmentOp::BitwiseAndAssignment:
op_string = "&=";
break;
case AssignmentOp::BitwiseOrAssignment:
op_string = "|=";
break;
case AssignmentOp::BitwiseXorAssignment:
op_string = "^=";
break;
case AssignmentOp::LeftShiftAssignment:
op_string = "<<=";
break;
case AssignmentOp::RightShiftAssignment:
op_string = ">>=";
break;
case AssignmentOp::UnsignedRightShiftAssignment:
op_string = ">>>=";
break;
case AssignmentOp::AndAssignment:
op_string = "&&=";
break;
case AssignmentOp::OrAssignment:
op_string = "||=";
break;
case AssignmentOp::NullishAssignment:
op_string = "\?\?=";
break;
}
ASTNode::dump(indent);
print_indent(indent + 1);
outln("{}", op_string);
m_lhs.visit([&](auto& lhs) { lhs->dump(indent + 1); });
m_rhs->dump(indent + 1);
}
void UpdateExpression::dump(int indent) const
{
const char* op_string = nullptr;
switch (m_op) {
case UpdateOp::Increment:
op_string = "++";
break;
case UpdateOp::Decrement:
op_string = "--";
break;
}
ASTNode::dump(indent);
if (m_prefixed) {
print_indent(indent + 1);
outln("{}", op_string);
}
m_argument->dump(indent + 1);
if (!m_prefixed) {
print_indent(indent + 1);
outln("{}", op_string);
}
}
Value VariableDeclaration::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
for (auto& declarator : m_declarations) {
if (auto* init = declarator.init()) {
auto initializer_result = init->execute(interpreter, global_object);
if (interpreter.exception())
return {};
declarator.target().visit(
[&](NonnullRefPtr<Identifier> const& id) {
auto variable_name = id->string();
if (is<ClassExpression>(*init))
update_function_name(initializer_result, variable_name);
interpreter.vm().set_variable(variable_name, initializer_result, global_object, true);
},
[&](NonnullRefPtr<BindingPattern> const& pattern) {
interpreter.vm().assign(pattern, initializer_result, global_object, true);
});
}
}
return {};
}
Value VariableDeclarator::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// NOTE: VariableDeclarator execution is handled by VariableDeclaration.
VERIFY_NOT_REACHED();
}
void VariableDeclaration::dump(int indent) const
{
const char* declaration_kind_string = nullptr;
switch (m_declaration_kind) {
case DeclarationKind::Let:
declaration_kind_string = "Let";
break;
case DeclarationKind::Var:
declaration_kind_string = "Var";
break;
case DeclarationKind::Const:
declaration_kind_string = "Const";
break;
}
ASTNode::dump(indent);
print_indent(indent + 1);
outln("{}", declaration_kind_string);
for (auto& declarator : m_declarations)
declarator.dump(indent + 1);
}
void VariableDeclarator::dump(int indent) const
{
ASTNode::dump(indent);
m_target.visit([indent](const auto& value) { value->dump(indent + 1); });
if (m_init)
m_init->dump(indent + 1);
}
void ObjectProperty::dump(int indent) const
{
ASTNode::dump(indent);
m_key->dump(indent + 1);
m_value->dump(indent + 1);
}
void ObjectExpression::dump(int indent) const
{
ASTNode::dump(indent);
for (auto& property : m_properties) {
property.dump(indent + 1);
}
}
void ExpressionStatement::dump(int indent) const
{
ASTNode::dump(indent);
m_expression->dump(indent + 1);
}
Value ObjectProperty::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// NOTE: ObjectProperty execution is handled by ObjectExpression.
VERIFY_NOT_REACHED();
}
Value ObjectExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto* object = Object::create(global_object, global_object.object_prototype());
for (auto& property : m_properties) {
auto key = property.key().execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (property.type() == ObjectProperty::Type::Spread) {
if (key.is_object() && is<Array>(key.as_object())) {
auto& array_to_spread = static_cast<Array&>(key.as_object());
for (auto& entry : array_to_spread.indexed_properties()) {
auto value = array_to_spread.get(entry.index());
if (interpreter.exception())
return {};
object->indexed_properties().put(entry.index(), value);
if (interpreter.exception())
return {};
}
} else if (key.is_object()) {
auto& obj_to_spread = key.as_object();
for (auto& it : obj_to_spread.shape().property_table_ordered()) {
if (it.value.attributes.is_enumerable()) {
object->define_direct_property(it.key, obj_to_spread.get(it.key), JS::default_attributes);
if (interpreter.exception())
return {};
}
}
} else if (key.is_string()) {
auto& str_to_spread = key.as_string().string();
for (size_t i = 0; i < str_to_spread.length(); i++) {
object->define_direct_property(i, js_string(interpreter.heap(), str_to_spread.substring(i, 1)), JS::default_attributes);
if (interpreter.exception())
return {};
}
}
continue;
}
auto value = property.value().execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (value.is_function() && property.is_method())
value.as_function().set_home_object(object);
String name = get_function_name(global_object, key);
if (property.type() == ObjectProperty::Type::Getter) {
name = String::formatted("get {}", name);
} else if (property.type() == ObjectProperty::Type::Setter) {
name = String::formatted("set {}", name);
}
update_function_name(value, name);
switch (property.type()) {
case ObjectProperty::Type::Getter:
VERIFY(value.is_function());
object->define_direct_accessor(PropertyName::from_value(global_object, key), &value.as_function(), nullptr, Attribute::Configurable | Attribute::Enumerable);
break;
case ObjectProperty::Type::Setter:
VERIFY(value.is_function());
object->define_direct_accessor(PropertyName::from_value(global_object, key), nullptr, &value.as_function(), Attribute::Configurable | Attribute::Enumerable);
break;
case ObjectProperty::Type::KeyValue:
object->define_direct_property(PropertyName::from_value(global_object, key), value, JS::default_attributes);
break;
case ObjectProperty::Type::Spread:
default:
VERIFY_NOT_REACHED();
}
if (interpreter.exception())
return {};
}
return object;
}
void MemberExpression::dump(int indent) const
{
print_indent(indent);
outln("{}(computed={})", class_name(), is_computed());
m_object->dump(indent + 1);
m_property->dump(indent + 1);
}
PropertyName MemberExpression::computed_property_name(Interpreter& interpreter, GlobalObject& global_object) const
{
if (!is_computed())
return verify_cast<Identifier>(*m_property).string();
auto value = m_property->execute(interpreter, global_object);
if (interpreter.exception())
return {};
VERIFY(!value.is_empty());
return PropertyName::from_value(global_object, value);
}
String MemberExpression::to_string_approximation() const
{
String object_string = "<object>";
if (is<Identifier>(*m_object))
object_string = static_cast<Identifier const&>(*m_object).string();
if (is_computed())
return String::formatted("{}[<computed>]", object_string);
return String::formatted("{}.{}", object_string, verify_cast<Identifier>(*m_property).string());
}
Value MemberExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto reference = to_reference(interpreter, global_object);
if (interpreter.exception())
return {};
return reference.get_value(global_object);
}
void OptionalChain::dump(int indent) const
{
print_indent(indent);
outln("{}", class_name());
m_base->dump(indent + 1);
for (auto& reference : m_references) {
reference.visit(
[&](Call const& call) {
print_indent(indent + 1);
outln("Call({})", call.mode == Mode::Optional ? "Optional" : "Not Optional");
for (auto& argument : call.arguments)
argument.value->dump(indent + 2);
},
[&](ComputedReference const& ref) {
print_indent(indent + 1);
outln("ComputedReference({})", ref.mode == Mode::Optional ? "Optional" : "Not Optional");
ref.expression->dump(indent + 2);
},
[&](MemberReference const& ref) {
print_indent(indent + 1);
outln("MemberReference({})", ref.mode == Mode::Optional ? "Optional" : "Not Optional");
ref.identifier->dump(indent + 2);
});
}
}
Optional<OptionalChain::ReferenceAndValue> OptionalChain::to_reference_and_value(JS::Interpreter& interpreter, JS::GlobalObject& global_object) const
{
// Note: This is wrapped in an optional to allow base_reference = ...
Optional<JS::Reference> base_reference = m_base->to_reference(interpreter, global_object);
auto base = base_reference->is_unresolvable() ? m_base->execute(interpreter, global_object) : base_reference->get_value(global_object);
if (interpreter.exception())
return {};
for (auto& reference : m_references) {
auto is_optional = reference.visit([](auto& ref) { return ref.mode; }) == Mode::Optional;
if (is_optional && base.is_nullish())
return ReferenceAndValue { {}, js_undefined() };
auto expression = reference.visit(
[&](Call const& call) -> NonnullRefPtr<Expression> {
return create_ast_node<CallExpression>(source_range(),
create_ast_node<SyntheticReferenceExpression>(source_range(), *base_reference, base),
call.arguments);
},
[&](ComputedReference const& ref) -> NonnullRefPtr<Expression> {
return create_ast_node<MemberExpression>(source_range(),
create_ast_node<SyntheticReferenceExpression>(source_range(), *base_reference, base),
ref.expression,
true);
},
[&](MemberReference const& ref) -> NonnullRefPtr<Expression> {
return create_ast_node<MemberExpression>(source_range(),
create_ast_node<SyntheticReferenceExpression>(source_range(), *base_reference, base),
ref.identifier,
false);
});
if (is<CallExpression>(*expression)) {
base_reference = JS::Reference {};
base = expression->execute(interpreter, global_object);
} else {
base_reference = expression->to_reference(interpreter, global_object);
base = base_reference->get_value(global_object);
}
if (interpreter.exception())
return {};
}
return ReferenceAndValue { base_reference.release_value(), base };
}
Value OptionalChain::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
if (auto result = to_reference_and_value(interpreter, global_object); result.has_value())
return result.release_value().value;
return {};
}
JS::Reference OptionalChain::to_reference(Interpreter& interpreter, GlobalObject& global_object) const
{
if (auto result = to_reference_and_value(interpreter, global_object); result.has_value())
return result.release_value().reference;
return {};
}
void MetaProperty::dump(int indent) const
{
String name;
if (m_type == MetaProperty::Type::NewTarget)
name = "new.target";
else if (m_type == MetaProperty::Type::ImportMeta)
name = "import.meta";
else
VERIFY_NOT_REACHED();
print_indent(indent);
outln("{} {}", class_name(), name);
}
Value MetaProperty::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
if (m_type == MetaProperty::Type::NewTarget)
return interpreter.vm().get_new_target().value_or(js_undefined());
if (m_type == MetaProperty::Type::ImportMeta)
TODO();
VERIFY_NOT_REACHED();
}
Value StringLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return js_string(interpreter.heap(), m_value);
}
Value NumericLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return Value(m_value);
}
Value BigIntLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
Crypto::SignedBigInteger integer;
if (m_value[0] == '0' && m_value.length() >= 3) {
if (m_value[1] == 'x' || m_value[1] == 'X') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base(16, m_value.substring(2, m_value.length() - 3)));
} else if (m_value[1] == 'o' || m_value[1] == 'O') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base(8, m_value.substring(2, m_value.length() - 3)));
} else if (m_value[1] == 'b' || m_value[1] == 'B') {
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base(2, m_value.substring(2, m_value.length() - 3)));
}
}
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base(10, m_value.substring(0, m_value.length() - 1)));
}
Value BooleanLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return Value(m_value);
}
Value NullLiteral::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return js_null();
}
void RegExpLiteral::dump(int indent) const
{
print_indent(indent);
outln("{} (/{}/{})", class_name(), pattern(), flags());
}
Value RegExpLiteral::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
Regex<ECMA262> regex(parsed_regex(), parsed_pattern(), parsed_flags());
return RegExpObject::create(global_object, move(regex), pattern(), flags());
}
void ArrayExpression::dump(int indent) const
{
ASTNode::dump(indent);
for (auto& element : m_elements) {
if (element) {
element->dump(indent + 1);
} else {
print_indent(indent + 1);
outln("<empty>");
}
}
}
Value ArrayExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto* array = Array::create(global_object, 0);
array->indexed_properties();
size_t index = 0;
for (auto& element : m_elements) {
auto value = Value();
if (element) {
value = element->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (is<SpreadExpression>(*element)) {
get_iterator_values(global_object, value, [&](Value iterator_value) {
array->indexed_properties().put(index++, iterator_value, default_attributes);
return IterationDecision::Continue;
});
if (interpreter.exception())
return {};
continue;
}
}
array->indexed_properties().put(index++, value, default_attributes);
}
return array;
}
void TemplateLiteral::dump(int indent) const
{
ASTNode::dump(indent);
for (auto& expression : m_expressions)
expression.dump(indent + 1);
}
Value TemplateLiteral::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
StringBuilder string_builder;
for (auto& expression : m_expressions) {
auto expr = expression.execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto string = expr.to_string(global_object);
if (interpreter.exception())
return {};
string_builder.append(string);
}
return js_string(interpreter.heap(), string_builder.build());
}
void TaggedTemplateLiteral::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
outln("(Tag)");
m_tag->dump(indent + 2);
print_indent(indent + 1);
outln("(Template Literal)");
m_template_literal->dump(indent + 2);
}
Value TaggedTemplateLiteral::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto& vm = interpreter.vm();
auto tag = m_tag->execute(interpreter, global_object);
if (vm.exception())
return {};
if (!tag.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, tag.to_string_without_side_effects());
return {};
}
auto& tag_function = tag.as_function();
auto& expressions = m_template_literal->expressions();
auto* strings = Array::create(global_object, 0);
MarkedValueList arguments(vm.heap());
arguments.append(strings);
for (size_t i = 0; i < expressions.size(); ++i) {
auto value = expressions[i].execute(interpreter, global_object);
if (vm.exception())
return {};
// tag`${foo}` -> "", foo, "" -> tag(["", ""], foo)
// tag`foo${bar}baz${qux}` -> "foo", bar, "baz", qux, "" -> tag(["foo", "baz", ""], bar, qux)
if (i % 2 == 0) {
strings->indexed_properties().append(value);
} else {
arguments.append(value);
}
}
auto* raw_strings = Array::create(global_object, 0);
for (auto& raw_string : m_template_literal->raw_strings()) {
auto value = raw_string.execute(interpreter, global_object);
if (vm.exception())
return {};
raw_strings->indexed_properties().append(value);
}
strings->define_direct_property(vm.names.raw, raw_strings, 0);
return vm.call(tag_function, js_undefined(), move(arguments));
}
void TryStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent);
outln("(Block)");
block().dump(indent + 1);
if (handler()) {
print_indent(indent);
outln("(Handler)");
handler()->dump(indent + 1);
}
if (finalizer()) {
print_indent(indent);
outln("(Finalizer)");
finalizer()->dump(indent + 1);
}
}
void CatchClause::dump(int indent) const
{
print_indent(indent);
m_parameter.visit(
[&](FlyString const& parameter) {
if (parameter.is_null())
outln("CatchClause");
else
outln("CatchClause ({})", parameter);
},
[&](NonnullRefPtr<BindingPattern> const& pattern) {
outln("CatchClause");
print_indent(indent);
outln("(Parameter)");
pattern->dump(indent + 2);
});
body().dump(indent + 1);
}
void ThrowStatement::dump(int indent) const
{
ASTNode::dump(indent);
argument().dump(indent + 1);
}
Value TryStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto result = interpreter.execute_statement(global_object, m_block, ScopeType::Try);
if (auto* exception = interpreter.exception()) {
if (m_handler) {
interpreter.vm().clear_exception();
HashMap<FlyString, Variable> parameters;
m_handler->parameter().visit(
[&](FlyString const& parameter) {
parameters.set(parameter, Variable { exception->value(), DeclarationKind::Var });
},
[&](NonnullRefPtr<BindingPattern> const& pattern) {
pattern->for_each_bound_name([&](auto& name) {
parameters.set(name, Variable { Value {}, DeclarationKind::Var });
});
});
auto* catch_scope = interpreter.heap().allocate<DeclarativeEnvironment>(global_object, move(parameters), interpreter.vm().running_execution_context().lexical_environment);
TemporaryChange<Environment*> scope_change(interpreter.vm().running_execution_context().lexical_environment, catch_scope);
if (auto* pattern = m_handler->parameter().get_pointer<NonnullRefPtr<BindingPattern>>())
interpreter.vm().assign(*pattern, exception->value(), global_object, true);
if (interpreter.exception())
result = js_undefined();
else
result = interpreter.execute_statement(global_object, m_handler->body());
}
}
if (m_finalizer) {
// Keep, if any, and then clear the current exception so we can
// execute() the finalizer without an exception in our way.
auto* previous_exception = interpreter.exception();
interpreter.vm().clear_exception();
// Remember what scope type we were unwinding to, and temporarily
// clear it as well (e.g. return from handler).
auto unwind_until = interpreter.vm().unwind_until();
interpreter.vm().stop_unwind();
auto finalizer_result = m_finalizer->execute(interpreter, global_object);
if (interpreter.vm().should_unwind()) {
// This was NOT a 'normal' completion (e.g. return from finalizer).
result = finalizer_result;
} else {
// Continue unwinding to whatever we found ourselves unwinding
// to when the finalizer was entered (e.g. return from handler,
// which is unaffected by normal completion from finalizer).
interpreter.vm().unwind(unwind_until);
// If we previously had an exception and the finalizer didn't
// throw a new one, restore the old one.
if (previous_exception && !interpreter.exception())
interpreter.vm().set_exception(*previous_exception);
}
}
return result.value_or(js_undefined());
}
Value CatchClause::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// NOTE: CatchClause execution is handled by TryStatement.
VERIFY_NOT_REACHED();
return {};
}
Value ThrowStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto value = m_argument->execute(interpreter, global_object);
if (interpreter.vm().exception())
return {};
interpreter.vm().throw_exception(global_object, value);
return {};
}
Value SwitchStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto discriminant_result = m_discriminant->execute(interpreter, global_object);
if (interpreter.exception())
return {};
bool falling_through = false;
auto last_value = js_undefined();
for (auto& switch_case : m_cases) {
if (!falling_through && switch_case.test()) {
auto test_result = switch_case.test()->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!strict_eq(discriminant_result, test_result))
continue;
}
falling_through = true;
for (auto& statement : switch_case.consequent()) {
auto value = statement.execute(interpreter, global_object);
if (!value.is_empty())
last_value = value;
if (interpreter.exception())
return {};
if (interpreter.vm().should_unwind()) {
if (interpreter.vm().should_unwind_until(ScopeType::Continuable, m_label)) {
// No stop_unwind(), the outer loop will handle that - we just need to break out of the switch/case.
return last_value;
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
return last_value;
} else {
return last_value;
}
}
}
}
return last_value;
}
Value SwitchCase::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// NOTE: SwitchCase execution is handled by SwitchStatement.
VERIFY_NOT_REACHED();
return {};
}
Value BreakStatement::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
interpreter.vm().unwind(ScopeType::Breakable, m_target_label);
return {};
}
Value ContinueStatement::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
interpreter.vm().unwind(ScopeType::Continuable, m_target_label);
return {};
}
void SwitchStatement::dump(int indent) const
{
ASTNode::dump(indent);
m_discriminant->dump(indent + 1);
for (auto& switch_case : m_cases) {
switch_case.dump(indent + 1);
}
}
void SwitchCase::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
if (m_test) {
outln("(Test)");
m_test->dump(indent + 2);
} else {
outln("(Default)");
}
print_indent(indent + 1);
outln("(Consequent)");
for (auto& statement : m_consequent)
statement.dump(indent + 2);
}
Value ConditionalExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
auto test_result = m_test->execute(interpreter, global_object);
if (interpreter.exception())
return {};
Value result;
if (test_result.to_boolean()) {
result = m_consequent->execute(interpreter, global_object);
} else {
result = m_alternate->execute(interpreter, global_object);
}
if (interpreter.exception())
return {};
return result;
}
void ConditionalExpression::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
outln("(Test)");
m_test->dump(indent + 2);
print_indent(indent + 1);
outln("(Consequent)");
m_consequent->dump(indent + 2);
print_indent(indent + 1);
outln("(Alternate)");
m_alternate->dump(indent + 2);
}
void SequenceExpression::dump(int indent) const
{
ASTNode::dump(indent);
for (auto& expression : m_expressions)
expression.dump(indent + 1);
}
Value SequenceExpression::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
Value last_value;
for (auto& expression : m_expressions) {
last_value = expression.execute(interpreter, global_object);
if (interpreter.exception())
return {};
}
return last_value;
}
Value DebuggerStatement::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
// Sorry, no JavaScript debugger available (yet)!
return {};
}
void ScopeNode::add_variables(NonnullRefPtrVector<VariableDeclaration> variables)
{
m_variables.extend(move(variables));
}
void ScopeNode::add_functions(NonnullRefPtrVector<FunctionDeclaration> functions)
{
m_functions.extend(move(functions));
}
void ScopeNode::add_hoisted_function(NonnullRefPtr<FunctionDeclaration> hoisted_function)
{
m_hoisted_functions.append(hoisted_function);
}
Value ImportStatement::execute(Interpreter& interpreter, GlobalObject&) const
{
InterpreterNodeScope node_scope { interpreter, *this };
dbgln("Modules are not fully supported yet!");
TODO();
return {};
}
Value ExportStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
if (m_statement)
return m_statement->execute(interpreter, global_object);
return {};
}
void ExportStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
outln("(ExportEntries)");
auto string_or_null = [](String const& string) -> String {
if (string.is_empty()) {
return "null";
}
return String::formatted("\"{}\"", string);
};
for (auto& entry : m_entries) {
print_indent(indent + 2);
outln("ModuleRequest: {}, ImportName: {}, LocalName: {}, ExportName: {}", string_or_null(entry.module_request), entry.kind == ExportEntry::ModuleRequest ? string_or_null(entry.local_or_import_name) : "null", entry.kind != ExportEntry::ModuleRequest ? string_or_null(entry.local_or_import_name) : "null", string_or_null(entry.export_name));
}
}
void ImportStatement::dump(int indent) const
{
ASTNode::dump(indent);
print_indent(indent + 1);
if (m_entries.is_empty()) {
// direct from "module" import
outln("Entire module '{}'", m_module_request);
} else {
outln("(ExportEntries) from {}", m_module_request);
for (auto& entry : m_entries) {
print_indent(indent + 2);
outln("ImportName: {}, LocalName: {}", entry.import_name, entry.local_name);
}
}
}
bool ExportStatement::has_export(StringView export_name) const
{
return any_of(m_entries.begin(), m_entries.end(), [&](auto& entry) {
return entry.export_name == export_name;
});
}
bool ImportStatement::has_bound_name(StringView name) const
{
return any_of(m_entries.begin(), m_entries.end(), [&](auto& entry) {
return entry.local_name == name;
});
}
}