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ladybird/Userland/Libraries/LibJS/AST.cpp
Andreas Kling dc8817638e LibJS: Only update anonymous function names when necessary 
Previously we would generate function names for anonymous functions
on every AssignmentExpression, even if we weren't assigning a function.

We were also setting names of anonymous functions in arrays, which is
apparently a SpiderMonkey specific behavior not supported by V8, JSC
or required by ECMA262. This patch removes that behavior.

This is a huge performance improvement on the CanvasCycle demo! :^)
2021-03-21 21:39:39 +01:00

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#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_node(node)
{
m_interpreter.enter_node(m_node);
}
~InterpreterNodeScope()
{
m_interpreter.exit_node(m_node);
}
private:
Interpreter& m_interpreter;
const ASTNode& m_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);
bool is_super_property_lookup = is<SuperExpression>(member_expression.object());
auto lookup_target = is_super_property_lookup ? interpreter.current_environment()->get_super_base() : member_expression.object().execute(interpreter, global_object);
if (vm.exception())
return {};
if (is_super_property_lookup && lookup_target.is_nullish()) {
vm.throw_exception<TypeError>(global_object, ErrorType::ObjectPrototypeNullOrUndefinedOnSuperPropertyAccess, lookup_target.to_string_without_side_effects());
return {};
}
auto* this_value = is_super_property_lookup ? &vm.this_value(global_object).as_object() : lookup_target.to_object(global_object);
if (vm.exception())
return {};
auto property_name = member_expression.computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
auto callee = lookup_target.to_object(global_object)->get(property_name).value_or(js_undefined());
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)) {
auto* super_constructor = interpreter.current_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 {};
interpreter.current_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 {};
auto* object = rhs_result.to_object(global_object);
while (object) {
auto property_names = object->get_own_properties(*object, Object::PropertyKind::Key, true);
for (auto& property_name : property_names.as_object().indexed_properties()) {
interpreter.vm().set_variable(variable_name, property_name.value_and_attributes(object).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 global_object.delete_property(reference.name());
auto* base_object = reference.base().to_object(global_object);
if (!base_object)
return {};
return 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:
switch (lhs_result.type()) {
case Value::Type::Empty:
VERIFY_NOT_REACHED();
return {};
case Value::Type::Undefined:
return js_string(vm, "undefined");
case Value::Type::Null:
// yes, this is on purpose. yes, this is how javascript works.
// yes, it's silly.
return js_string(vm, "object");
case Value::Type::Number:
return js_string(vm, "number");
case Value::Type::String:
return js_string(vm, "string");
case Value::Type::Object:
if (lhs_result.is_function())
return js_string(vm, "function");
return js_string(vm, "object");
case Value::Type::Boolean:
return js_string(vm, "boolean");
case Value::Type::Symbol:
return js_string(vm, "symbol");
case Value::Type::BigInt:
return js_string(vm, "bigint");
default:
VERIFY_NOT_REACHED();
}
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);
if (method.kind() == ClassMethod::Kind::Method) {
target.define_property(StringOrSymbol::from_value(global_object, key), method_value);
} else {
String accessor_name = [&] {
switch (method.kind()) {
case ClassMethod::Kind::Getter:
return String::formatted("get {}", get_function_name(global_object, key));
case ClassMethod::Kind::Setter:
return String::formatted("set {}", get_function_name(global_object, key));
default:
VERIFY_NOT_REACHED();
}
}();
update_function_name(method_value, accessor_name);
target.define_accessor(StringOrSymbol::from_value(global_object, key), method_function, method.kind() == ClassMethod::Kind::Getter, Attribute::Configurable | Attribute::Enumerable);
}
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;
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 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);
}
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 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 FunctionNode::dump(int indent, const String& class_name) const
{
print_indent(indent);
outln("{} '{}'", class_name, name());
if (!m_parameters.is_empty()) {
print_indent(indent + 1);
outln("(Parameters)\n");
for (auto& parameter : m_parameters) {
print_indent(indent + 2);
if (parameter.is_rest)
out("...");
outln("{}", parameter.name);
if (parameter.default_value)
parameter.default_value->dump(indent + 3);
}
}
if (!m_variables.is_empty()) {
print_indent(indent + 1);
outln("(Variables)");
for (auto& variable : m_variables)
variable.dump(indent + 2);
}
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 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 (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_AND_RHS() \
do { \
lhs_result = m_lhs->execute(interpreter, global_object); \
if (interpreter.exception()) \
return {}; \
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:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::OrAssignment:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (lhs_result.to_boolean())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
case AssignmentOp::NullishAssignment:
lhs_result = m_lhs->execute(interpreter, global_object);
if (interpreter.exception())
return {};
if (!lhs_result.is_nullish())
return lhs_result;
rhs_result = m_rhs->execute(interpreter, global_object);
break;
}
if (interpreter.exception())
return {};
auto reference = m_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 {};
}
// FIXME: We should also check if the LHS is an identifier reference.
if (rhs_result.is_function())
update_function_name(rhs_result, get_function_name(global_object, reference.name().to_value(interpreter.vm())));
reference.put(global_object, rhs_result);
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(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(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->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 initalizer_result = init->execute(interpreter, global_object);
if (interpreter.exception())
return {};
auto variable_name = declarator.id().string();
update_function_name(initalizer_result, variable_name);
interpreter.vm().set_variable(variable_name, initalizer_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_id->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_empty(global_object);
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_array()) {
auto& array_to_spread = static_cast<Array&>(key.as_object());
for (auto& entry : array_to_spread.indexed_properties()) {
object->indexed_properties().put(object, entry.index(), entry.value_and_attributes(&array_to_spread).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_property(it.key, obj_to_spread.get(it.key));
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_property(i, js_string(interpreter.heap(), str_to_spread.substring(i, 1)));
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);
if (property.type() == ObjectProperty::Type::Getter || property.type() == ObjectProperty::Type::Setter) {
VERIFY(value.is_function());
object->define_accessor(PropertyName::from_value(global_object, key), value.as_function(), property.type() == ObjectProperty::Type::Getter, Attribute::Configurable | Attribute::Enumerable);
if (interpreter.exception())
return {};
} else {
object->define_property(PropertyName::from_value(global_object, key), value);
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()) {
VERIFY(is<Identifier>(*m_property));
return static_cast<const 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<const Identifier&>(*m_object).string();
if (is_computed())
return String::formatted("{}[<computed>]", object_string);
VERIFY(is<Identifier>(*m_property));
return String::formatted("{}.{}", object_string, static_cast<const Identifier&>(*m_property).string());
}
Value MemberExpression::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_result = object_value.to_object(global_object);
if (interpreter.exception())
return {};
auto property_name = computed_property_name(interpreter, global_object);
if (!property_name.is_valid())
return {};
return object_result->get(property_name).value_or(js_undefined());
}
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 };
return js_bigint(interpreter.heap(), Crypto::SignedBigInteger::from_base10(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(), content(), flags());
}
Value RegExpLiteral::execute(Interpreter& interpreter, GlobalObject& global_object) const
{
InterpreterNodeScope node_scope { interpreter, *this };
return RegExpObject::create(global_object, content(), 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);
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().append(iterator_value);
return IterationDecision::Continue;
});
if (interpreter.exception())
return {};
continue;
}
}
array->indexed_properties().append(value);
}
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);
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);
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_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);
if (m_parameter.is_null())
outln("CatchClause");
else
outln("CatchClause ({})", m_parameter);
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 };
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;
parameters.set(m_handler->parameter(), Variable { exception->value(), DeclarationKind::Var });
auto* catch_scope = interpreter.heap().allocate<LexicalEnvironment>(global_object, move(parameters), interpreter.vm().call_frame().scope);
TemporaryChange<ScopeObject*> scope_change(interpreter.vm().call_frame().scope, catch_scope);
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();
interpreter.vm().stop_unwind();
m_finalizer->execute(interpreter, global_object);
// If we previously had an exception and the finalizer didn't
// throw a new one, restore the old one.
// FIXME: This will print debug output in throw_exception() for
// a seconds time with m_should_log_exceptions enabled.
if (previous_exception && !interpreter.exception())
interpreter.vm().throw_exception(previous_exception);
}
return 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;
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 last_value = statement.execute(interpreter, global_object);
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 {};
} else if (interpreter.vm().should_unwind_until(ScopeType::Breakable, m_label)) {
interpreter.vm().stop_unwind();
return {};
} else {
return last_value;
}
}
}
}
return js_undefined();
}
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
{
interpreter.enter_node(*this);
ScopeGuard exit_node { [&] { interpreter.exit_node(*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.append(move(variables));
}
void ScopeNode::add_functions(NonnullRefPtrVector<FunctionDeclaration> functions)
{
m_functions.append(move(functions));
}
}
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