ladybird/Userland/Libraries/LibJS/Bytecode/Op.cpp

/*
 * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <LibJS/AST.h>
#include <LibJS/Bytecode/Interpreter.h>
#include <LibJS/Bytecode/Op.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/ScriptFunction.h>
#include <LibJS/Runtime/Value.h>

namespace JS::Bytecode::Op {

void Load::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = m_value;
}

void Add::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = add(interpreter.global_object(), interpreter.reg(m_src1), interpreter.reg(m_src2));
}

void Sub::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = sub(interpreter.global_object(), interpreter.reg(m_src1), interpreter.reg(m_src2));
}

void LessThan::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = less_than(interpreter.global_object(), interpreter.reg(m_src1), interpreter.reg(m_src2));
}

void AbstractInequals::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = Value(!abstract_eq(interpreter.global_object(), interpreter.reg(m_src1), interpreter.reg(m_src2)));
}

void NewString::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = js_string(interpreter.vm(), m_string);
}

void NewObject::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = Object::create_empty(interpreter.global_object());
}

void GetVariable::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.reg(m_dst) = interpreter.vm().get_variable(m_identifier, interpreter.global_object());
}

void SetVariable::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.vm().set_variable(m_identifier, interpreter.reg(m_src), interpreter.global_object());
}

void GetById::execute(Bytecode::Interpreter& interpreter) const
{
    if (auto* object = interpreter.reg(m_base).to_object(interpreter.global_object()))
        interpreter.reg(m_dst) = object->get(m_property);
}

void PutById::execute(Bytecode::Interpreter& interpreter) const
{
    if (auto* object = interpreter.reg(m_base).to_object(interpreter.global_object()))
        object->put(m_property, interpreter.reg(m_src));
}

void Jump::execute(Bytecode::Interpreter& interpreter) const
{
    interpreter.jump(m_target);
}

void JumpIfFalse::execute(Bytecode::Interpreter& interpreter) const
{
    VERIFY(m_target.has_value());
    auto result = interpreter.reg(m_result);
    if (!result.as_bool())
        interpreter.jump(m_target.value());
}

void JumpIfTrue::execute(Bytecode::Interpreter& interpreter) const
{
    VERIFY(m_target.has_value());
    auto result = interpreter.reg(m_result);
    if (result.as_bool())
        interpreter.jump(m_target.value());
}

void EnterScope::execute(Bytecode::Interpreter& interpreter) const
{
    auto& vm = interpreter.vm();
    auto& global_object = interpreter.global_object();

    for (auto& declaration : m_scope_node.functions())
        vm.current_scope()->put_to_scope(declaration.name(), { js_undefined(), DeclarationKind::Var });

    for (auto& declaration : m_scope_node.functions()) {
        auto* function = ScriptFunction::create(global_object, declaration.name(), declaration.body(), declaration.parameters(), declaration.function_length(), vm.current_scope(), declaration.is_strict_mode());
        vm.set_variable(declaration.name(), function, global_object);
    }

    // FIXME: Process variable declarations.
    // FIXME: Whatever else JS::Interpreter::enter_scope() does.
}

String Load::to_string() const
{
    return String::formatted("Load dst:{}, value:{}", m_dst, m_value.to_string_without_side_effects());
}

String Add::to_string() const
{
    return String::formatted("Add dst:{}, src1:{}, src2:{}", m_dst, m_src1, m_src2);
}

String Sub::to_string() const
{
    return String::formatted("Sub dst:{}, src1:{}, src2:{}", m_dst, m_src1, m_src2);
}

String LessThan::to_string() const
{
    return String::formatted("LessThan dst:{}, src1:{}, src2:{}", m_dst, m_src1, m_src2);
}

String AbstractInequals::to_string() const
{
    return String::formatted("AbstractInequals dst:{}, src1:{}, src2:{}", m_dst, m_src1, m_src2);
}

String NewString::to_string() const
{
    return String::formatted("NewString dst:{}, string:\"{}\"", m_dst, m_string);
}

String NewObject::to_string() const
{
    return String::formatted("NewObject dst:{}", m_dst);
}

String GetVariable::to_string() const
{
    return String::formatted("GetVariable dst:{}, identifier:{}", m_dst, m_identifier);
}

String SetVariable::to_string() const
{
    return String::formatted("SetVariable identifier:{}, src:{}", m_identifier, m_src);
}

String PutById::to_string() const
{
    return String::formatted("PutById base:{}, property:{}, src:{}", m_base, m_property, m_src);
}

String GetById::to_string() const
{
    return String::formatted("GetById dst:{}, base:{}, property:{}", m_dst, m_base, m_property);
}

String Jump::to_string() const
{
    return String::formatted("Jump {}", m_target);
}

String JumpIfFalse::to_string() const
{
    if (m_target.has_value())
        return String::formatted("JumpIfFalse result:{}, target:{}", m_result, m_target.value());
    return String::formatted("JumpIfFalse result:{}, target:<empty>", m_result);
}

String JumpIfTrue::to_string() const
{
    if (m_target.has_value())
        return String::formatted("JumpIfTrue result:{}, target:{}", m_result, m_target.value());
    return String::formatted("JumpIfTrue result:{}, target:<empty>", m_result);
}

String EnterScope::to_string() const
{
    return "EnterScope";
}

}