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OxideJS-New/crates/oxide_vm/src/vm.rs
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#![allow(clippy::arc_with_non_send_sync)]
use std::sync::Arc;
use oxide_compiler::compiler::Constant;
use oxide_compiler::module::CompiledModule;
use oxide_compiler::opcode::{self, OpCode};
use crate::bindings;
pub use crate::bindings::init_kernel_builtins;
use crate::coercion;
use crate::native::NativeFn;
use oxide_kernel::kernel::{KernelConfig, OxideKernel};
use oxide_kernel::prop_forge::PropTemplate;
use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
use oxide_types::mem::{Epoch, P};
use oxide_types::object::JsObject;
use oxide_types::value::JsValue;
#[allow(unused_macros)]
macro_rules! throw_err {
($self:ident, Error, $msg:expr) => {{
let error = crate::builtins::error::create_error($self, $msg);
$self.exception_value = Some(error);
$self.pending_error_kind = Some("Error");
match $self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}};
($self:ident, TypeError, $msg:expr) => {{
let error = crate::builtins::error::create_type_error($self, $msg);
$self.exception_value = Some(error);
$self.pending_error_kind = Some("TypeError");
match $self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}};
($self:ident, ReferenceError, $msg:expr) => {{
let error = crate::builtins::error::create_reference_error($self, $msg);
$self.exception_value = Some(error);
$self.pending_error_kind = Some("ReferenceError");
match $self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}};
($self:ident, SyntaxError, $msg:expr) => {{
let error = crate::builtins::error::create_syntax_error($self, $msg);
$self.exception_value = Some(error);
$self.pending_error_kind = Some("SyntaxError");
match $self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}};
}
macro_rules! binary_arith {
($self:ident, $a:expr, $b:expr, $rd:expr, $op:tt) => {{
let l = coercion::to_number($self.regs[$a], $self.kernel.string_forge().as_ref());
let r = coercion::to_number($self.regs[$b], $self.kernel.string_forge().as_ref());
$self.regs[$rd] = JsValue::float(l $op r);
}}
}
macro_rules! compound_arith {
($self:ident, $rd:expr, $a:expr, $op:tt) => {{
let l = coercion::to_number($self.regs[$rd], $self.kernel.string_forge().as_ref());
let r = coercion::to_number($self.regs[$a], $self.kernel.string_forge().as_ref());
$self.regs[$rd] = JsValue::float(l $op r);
}}
}
macro_rules! set_or_create_prop {
($self:ident, $obj:expr, $prop_name_si:expr, $new_val:expr) => {{
if let Some(pos) = $self
.kernel
.shape_forge()
.lookup_position($obj.shape_id(), $prop_name_si)
{
$obj.set_prop_at(pos, $new_val);
} else {
let new_shape_id = $self
.kernel
.shape_forge()
.make_shape($obj.shape_id(), $prop_name_si);
$obj.set_shape_id(new_shape_id);
$obj.push_prop($new_val);
$obj.bump_generation();
}
}};
}
macro_rules! member_read_prop {
($self:ident, $obj:expr, $prop_name_si:expr) => {{
let ext0 = $self.bytecode[$self.pc];
let ext1 = $self.bytecode[$self.pc + 1];
let ext2 = $self.bytecode[$self.pc + 2];
$self.pc += 3;
let cached_shape_id = ext0 & 0x00FF_FFFF;
let cached_ptr = ((ext2 as u64) << 32) | (ext1 as u64);
if cached_shape_id != 0 && cached_shape_id == $obj.shape_id() && cached_ptr != 0 {
unsafe { *(cached_ptr as *const JsValue) }
} else if let Some(template) = $self.kernel.prop_forge().get_template($obj.shape_id()) {
if template.prop_name != $prop_name_si {
$self
.resolve_property($obj, $prop_name_si)
.unwrap_or(JsValue::undefined())
} else if let Some(ptr) = $self.template_prop_ptr($obj, &template) {
$self.bytecode[$self.pc - 3] = $obj.shape_id() & 0x00FF_FFFF;
$self.bytecode[$self.pc - 2] = ptr as u32;
$self.bytecode[$self.pc - 1] = (ptr as u64 >> 32) as u32;
unsafe { *ptr }
} else {
$self
.resolve_property($obj, $prop_name_si)
.unwrap_or(JsValue::undefined())
}
} else if let Some(val) = $self.resolve_property($obj, $prop_name_si) {
if let Some(pos) = $self
.kernel
.shape_forge()
.lookup_position($obj.shape_id(), $prop_name_si)
{
if let Some(ptr) = $obj.prop_ptr_at(pos) {
$self.bytecode[$self.pc - 3] = $obj.shape_id() & 0x00FF_FFFF;
$self.bytecode[$self.pc - 2] = ptr as u32;
$self.bytecode[$self.pc - 1] = (ptr as u64 >> 32) as u32;
}
}
val
} else {
JsValue::undefined()
}
}};
}
pub struct CallFrame {
pub return_addr: usize,
pub function_name: u32,
pub caller_reg_limit: u8,
pub saved_regs: Box<[JsValue]>,
pub saved_this: JsValue,
pub saved_new_target: JsValue,
}
pub struct ForInIter<'bump> {
pub keys: bumpalo::collections::Vec<'bump, JsValue>,
pub index: usize,
}
pub struct TryHandler {
pub catch_pc: Option<usize>,
pub finally_pc: Option<usize>,
pub frame_depth: usize,
}
pub struct Vm {
pub(crate) regs: [JsValue; 256],
pub(crate) pc: usize,
pub(crate) bytecode: Vec<opcode::Instr>,
pub(crate) constants: Vec<JsValue>,
pub(crate) frames: Vec<CallFrame>,
pub for_in_iters: Vec<*mut u8>,
pub(crate) kernel: Arc<OxideKernel>,
pub(crate) interned_strings: Vec<u32>,
pub epoch: Epoch,
pub object_prototype: P<JsObject>,
pub math_rng_state: u64,
pub(crate) sub_modules: Vec<CompiledModule>,
pub(crate) sub_module_constants: Vec<Vec<JsValue>>,
pub(crate) saved_bytecode_stack: Vec<Vec<opcode::Instr>>,
pub(crate) saved_constants_stack: Vec<Vec<JsValue>>,
pub(crate) try_stack: Vec<TryHandler>,
pub(crate) exception_value: Option<JsValue>,
pub(crate) pending_exception: Option<JsValue>,
pub(crate) pending_error_kind: Option<&'static str>,
pub(crate) symbol_counter: u32,
pub(crate) symbol_descriptions: Vec<String>,
#[allow(dead_code)]
pub(crate) for_of_iters: Vec<*mut u8>,
pub(crate) root_reg_limit: u8,
pub(crate) active_reg_limit: u8,
}
impl Vm {
pub fn new() -> Self {
let kernel = Arc::new(OxideKernel::new(KernelConfig::minimal()));
bindings::init_kernel_builtins(&kernel);
let obj_proto = P::clone(&kernel.builtin_world().object_proto);
Self {
regs: [JsValue::undefined(); 256],
pc: 0,
bytecode: Vec::new(),
constants: Vec::new(),
frames: Vec::with_capacity(128),
for_in_iters: Vec::new(),
kernel,
interned_strings: Vec::new(),
epoch: Epoch::new(),
object_prototype: obj_proto,
math_rng_state: 0,
sub_modules: Vec::new(),
sub_module_constants: Vec::new(),
saved_bytecode_stack: Vec::new(),
saved_constants_stack: Vec::new(),
try_stack: Vec::new(),
exception_value: None,
pending_exception: None,
pending_error_kind: None,
symbol_counter: 0,
symbol_descriptions: Vec::new(),
for_of_iters: Vec::new(),
root_reg_limit: 0,
active_reg_limit: 0,
}
}
pub fn with_kernel(kernel: Arc<OxideKernel>) -> Self {
let obj_proto = P::clone(&kernel.builtin_world().object_proto);
Self {
regs: [JsValue::undefined(); 256],
pc: 0,
bytecode: Vec::new(),
constants: Vec::new(),
frames: Vec::with_capacity(128),
for_in_iters: Vec::new(),
kernel,
interned_strings: Vec::new(),
epoch: Epoch::new(),
object_prototype: obj_proto,
math_rng_state: 0,
sub_modules: Vec::new(),
sub_module_constants: Vec::new(),
saved_bytecode_stack: Vec::new(),
saved_constants_stack: Vec::new(),
try_stack: Vec::new(),
exception_value: None,
pending_exception: None,
pending_error_kind: None,
symbol_counter: 0,
symbol_descriptions: Vec::new(),
for_of_iters: Vec::new(),
root_reg_limit: 0,
active_reg_limit: 0,
}
}
pub fn step_rng(&mut self) {
if self.math_rng_state == 0 {
self.math_rng_state = std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)
.unwrap_or_default()
.as_nanos() as u64;
}
self.math_rng_state = self
.math_rng_state
.wrapping_mul(6364136223846793005)
.wrapping_add(1442695040888963407);
}
pub fn math_rng_value(&self) -> f64 {
(self.math_rng_state >> 33) as f64 / (1u64 << 31) as f64
}
pub fn kernel(&self) -> &Arc<OxideKernel> {
&self.kernel
}
pub fn reg(&self, idx: u8) -> JsValue {
self.regs[idx as usize]
}
pub fn set_reg(&mut self, idx: u8, val: JsValue) {
self.regs[idx as usize] = val;
}
pub fn regs_mut(&mut self) -> &mut [JsValue; 256] {
&mut self.regs
}
pub fn epoch_mut(&mut self) -> &mut Epoch {
&mut self.epoch
}
pub fn epoch(&self) -> &Epoch {
&self.epoch
}
fn clear_execution_state(&mut self) {
self.regs = [JsValue::undefined(); 256];
self.pc = 0;
self.frames.clear();
self.for_in_iters.clear();
self.for_of_iters.clear();
self.saved_bytecode_stack.clear();
self.saved_constants_stack.clear();
self.try_stack.clear();
self.exception_value = None;
self.pending_exception = None;
self.pending_error_kind = None;
}
pub fn reset(&mut self) {
self.clear_execution_state();
self.bytecode.clear();
self.constants.clear();
self.epoch.reset();
self.interned_strings.clear();
self.root_reg_limit = 0;
self.active_reg_limit = 0;
}
pub fn intern(&mut self, s: &str) -> JsValue {
let (idx, hash) = self.kernel.string_forge().intern(s);
self.interned_strings.push(idx);
JsValue::string(idx, hash)
}
/// Create a function JsObject for a BytecodeFunc constant.
/// When `is_arrow` is true, captures the current `this` (regs[254])
/// for lexical this binding at call time (D-01).
fn create_function_object(&mut self, sub_idx: u32, is_arrow: bool) -> JsValue {
let func_proto_ptr = self.kernel.builtin_world().function_proto.as_ptr() as *mut JsObject;
let proto_val = JsValue::from_js_object(func_proto_ptr);
let mut obj = JsObject::new_empty(EMPTY_SHAPE_ID, proto_val);
obj.set_function(true);
obj.set_sub_module_index(sub_idx);
if is_arrow {
obj.set_arrow(true);
// Capture lexical `this` from the enclosing scope (regs[254]).
obj.set_captured_this(self.regs[254]);
}
let obj_ptr = self.epoch.alloc(obj);
JsValue::object(obj_ptr as *mut u8)
}
/// Convert a CompiledModule's constants into JsValue vec.
fn convert_constants(&mut self, module: &CompiledModule) -> Vec<JsValue> {
module
.constants
.iter()
.map(|c| match c {
Constant::Number(v) => JsValue::float(*v),
Constant::Int(v) => JsValue::int(*v),
Constant::String(s) => self.intern(s),
Constant::Boolean(b) => JsValue::bool(*b),
Constant::Null => JsValue::null(),
Constant::Undefined => JsValue::undefined(),
Constant::BytecodeFunc(idx) => {
// 1-indexed: idx 1 = sub_modules[0], idx 0 = sentinel
let sub_idx = *idx as usize;
let is_arrow = if sub_idx > 0 && sub_idx <= module.sub_modules.len() {
module.sub_modules[sub_idx - 1].is_arrow
} else {
false
};
self.create_function_object(*idx, is_arrow)
}
Constant::RegExp(pattern, flags) => {
let pat_si = self.kernel.string_forge().intern(pattern).0;
let flags_si = self.kernel.string_forge().intern(flags).0;
let pat_val = JsValue::string(pat_si, 0);
let flags_val = JsValue::string(flags_si, 0);
let native_fn =
self.kernel.builtin_world().regexp_constructor.as_ptr() as *mut JsObject;
let ctor = unsafe { &*native_fn };
let ctor_fn = ctor.native_fn();
if ctor_fn.is_none() {
return JsValue::undefined();
}
let saved_0 = self.regs[0];
let saved_1 = self.regs[1];
let saved_2 = self.regs[2];
self.regs[0] = JsValue::undefined();
self.regs[1] = pat_val;
self.regs[2] = flags_val;
let func: crate::native::NativeFn =
unsafe { std::mem::transmute(ctor_fn.unwrap()) };
let result = func(self, &[0, 1, 2]);
self.regs[0] = saved_0;
self.regs[1] = saved_1;
self.regs[2] = saved_2;
match result {
Ok(val) => val,
Err(_) => JsValue::undefined(),
}
}
})
.collect()
}
pub fn lookup_str(&self, val: JsValue) -> Option<String> {
if !val.is_string() {
return None;
}
self.kernel.string_forge().lookup(val.as_string_index())
}
fn thrown_error_kind(&self, val: JsValue) -> &'static str {
if !val.is_object() {
return "Error";
}
let name_si = self.kernel.string_forge().intern("name").0;
let obj = unsafe { &*val.as_js_object_ptr() };
let Some(name_val) = self.resolve_property(obj, name_si) else {
return "Error";
};
let Some(name) = self.lookup_str(name_val) else {
return "Error";
};
match name.as_str() {
"TypeError" => "TypeError",
"ReferenceError" => "ReferenceError",
"RangeError" => "RangeError",
"SyntaxError" => "SyntaxError",
"URIError" => "URIError",
"EvalError" => "EvalError",
"Error" => "Error",
_ => "Error",
}
}
fn property_key_si(&mut self, val: JsValue) -> u32 {
if val.is_string() {
return val.as_string_index();
}
let key = coercion::to_string(self.kernel.string_forge().as_ref(), val);
self.kernel.string_forge().intern(&key).0
}
fn template_prop_ptr(&self, obj: &JsObject, template: &PropTemplate) -> Option<*const JsValue> {
let pos = template.position as usize;
obj.hash_props_vec().and_then(|vec| {
if pos < vec.len() {
Some(&*vec[pos] as *const JsValue)
} else {
None
}
})
}
fn resolve_property(&self, obj: &JsObject, prop_name_si: u32) -> Option<JsValue> {
let length_si = self.kernel.string_forge().intern("length").0;
if obj.is_array() && prop_name_si == length_si {
return Some(JsValue::int(obj.prop_count() as i32));
}
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
let val = obj.get_prop_at(pos);
if !val.is_undefined() || obj.prop_vec_len() > pos as usize {
return Some(val);
}
}
let mut proto = obj.proto();
while proto.is_object() {
let proto_obj = unsafe { &*proto.as_js_object_ptr() };
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(proto_obj.shape_id(), prop_name_si)
{
let val = proto_obj.get_prop_at(pos);
if !val.is_undefined() || proto_obj.prop_vec_len() > pos as usize {
return Some(val);
}
}
proto = proto_obj.proto();
}
None
}
fn set_member_prop(
&mut self,
obj: &mut JsObject,
prop_name_si: u32,
val: JsValue,
) -> Result<(), String> {
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, val);
// IC write-back: 3 extension words (shape_id + ptr_lo + ptr_hi)
if let Some(ptr) = obj.prop_ptr_at(pos) {
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
}
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
let new_pos = obj.push_prop(val);
obj.bump_generation();
if let Some(ptr) = obj.prop_ptr_at(new_pos) {
self.bytecode[self.pc - 3] = new_shape_id & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
self.kernel.prop_forge().upsert(
new_shape_id,
PropTemplate {
shape_id: new_shape_id,
prop_name: prop_name_si,
position: new_pos,
generation: obj.generation(),
},
);
}
}
Ok(())
}
pub fn rerun(&mut self) -> Result<JsValue, String> {
self.clear_execution_state();
self.active_reg_limit = self.root_reg_limit;
self.clear_ic_caches();
self.dispatch()
}
fn clear_ic_caches(&mut self) {
let mut i = 0;
while i < self.bytecode.len() {
let op = opcode::opcode(self.bytecode[i]);
if op.has_ic_ext_words() {
if i + 3 < self.bytecode.len() {
self.bytecode[i + 1] = 0;
self.bytecode[i + 2] = 0;
self.bytecode[i + 3] = 0;
}
i += 4;
} else {
i += 1;
}
}
}
pub fn run(&mut self, module: &CompiledModule) -> Result<JsValue, String> {
self.clear_execution_state();
self.constants = self.convert_constants(module);
self.sub_modules = module.sub_modules.clone();
self.sub_module_constants = vec![Vec::new(); self.sub_modules.len()];
self.bytecode = module.bytecode.clone();
self.root_reg_limit = module.n_registers.max(1);
self.active_reg_limit = self.root_reg_limit;
for (name, reg) in &module.builtin_reg_map {
let si = self.kernel.string_forge().intern(name.as_str()).0;
let global = self.kernel.global_object();
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(global.shape_id(), si)
{
self.regs[*reg as usize] = global.get_prop_at(pos);
}
}
self.dispatch()
}
/// Call a bytecode function from native code (D-09).
/// Stub: sub_module storage not yet wired (plan 12.1-03).
#[allow(dead_code)]
pub fn call_bytecode_func(
&mut self,
_callback_obj: &JsObject,
_args_regs: &[u8],
) -> Result<JsValue, String> {
Err("bytecode function calls not yet supported".into())
}
pub(crate) fn unwind(&mut self) -> Result<(), String> {
while let Some(handler) = self.try_stack.pop() {
if let Some(finally_pc) = handler.finally_pc {
if self.pending_exception.is_none() {
self.pending_exception = self.exception_value.take();
}
self.try_stack.push(handler);
self.pc = finally_pc;
return Ok(());
}
if let Some(catch_pc) = handler.catch_pc {
let exc = self.exception_value.take().unwrap_or(JsValue::undefined());
self.regs[0] = exc;
self.pc = catch_pc;
return Ok(());
}
}
let exc = self.exception_value.take().unwrap_or(JsValue::undefined());
let kind_str = self.pending_error_kind.take().unwrap_or("Error");
let msg = format!("uncaught {kind_str}: {exc}");
Err(msg)
}
fn dispatch(&mut self) -> Result<JsValue, String> {
let mut steps: u64 = 0;
loop {
steps += 1;
if let Some(max_steps) = self.kernel.config.max_steps {
if steps > max_steps {
return Err(format!("VM step limit exceeded at pc={}", self.pc));
}
}
if self.pc >= self.bytecode.len() {
return Err("program counter out of bounds".into());
}
let instr = self.bytecode[self.pc];
let op = opcode::opcode(instr);
let rd = opcode::rd(instr) as usize;
let a = opcode::a(instr) as usize;
let b = opcode::b(instr) as usize;
self.pc += 1;
match op {
OpCode::NOP => {}
OpCode::HALT => return Ok(self.regs[0]),
OpCode::LOAD_CONST => {
self.dispatch_load_const(rd, instr)?;
}
OpCode::ADD => {
self.dispatch_add(rd, a, b);
}
OpCode::SUB => {
binary_arith!(self, a, b, rd, -);
}
OpCode::MUL => {
binary_arith!(self, a, b, rd, *);
}
OpCode::DIV => {
binary_arith!(self, a, b, rd, /);
}
OpCode::MOD => {
binary_arith!(self, a, b, rd, %);
}
OpCode::NEG => {
let v = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
self.regs[rd] = JsValue::float(-v);
}
OpCode::EQ => {
self.dispatch_eq(rd, a, b);
}
OpCode::NEQ => {
self.dispatch_neq(rd, a, b);
}
OpCode::LT => {
self.dispatch_lt(rd, a, b);
}
OpCode::GT => {
self.dispatch_gt(rd, a, b);
}
OpCode::LTE => {
self.dispatch_lte(rd, a, b);
}
OpCode::GTE => {
self.dispatch_gte(rd, a, b);
}
OpCode::STRICT_EQ => {
self.dispatch_strict_eq(rd, a, b);
}
OpCode::STRICT_NEQ => {
self.dispatch_strict_neq(rd, a, b);
}
OpCode::UNARY_PLUS => {
let v = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
self.regs[rd] = JsValue::float(v);
}
OpCode::JMP => {
let offset = opcode::offset16(instr) as isize;
self.pc = ((self.pc as isize) + offset - 1) as usize;
}
OpCode::JMP_IF_FALSE => {
let cond =
coercion::to_boolean(self.regs[rd], self.kernel.string_forge().as_ref());
if !cond {
let offset = opcode::offset16(instr) as isize;
self.pc = ((self.pc as isize) + offset - 1) as usize;
}
}
OpCode::JMP_IF_TRUE => {
let cond =
coercion::to_boolean(self.regs[rd], self.kernel.string_forge().as_ref());
if cond {
let offset = opcode::offset16(instr) as isize;
self.pc = ((self.pc as isize) + offset - 1) as usize;
}
}
OpCode::LOAD_VAR => {
self.regs[rd] = self.regs[a];
}
OpCode::STORE_VAR => {
if b != 0 {
// const guard: check if already initialized
if !self.regs[rd].is_undefined() {
throw_err!(self, TypeError, "Assignment to constant variable");
}
}
self.regs[rd] = self.regs[a];
}
OpCode::CALL => {
let callee_reg = rd;
let this_reg = a as u8;
let first_arg_reg = b as u8;
let callee = self.regs[callee_reg];
if callee.is_object() {
let obj_ptr = callee.as_js_object_ptr();
if !obj_ptr.is_null() {
let obj = unsafe { &*obj_ptr };
if obj.is_function() {
let ext = self.bytecode[self.pc];
self.pc += 1;
let arg_count = (ext & 0xFF) as usize;
if obj.native_fn().is_some() {
match self.dispatch_native_call(
obj,
callee,
this_reg,
first_arg_reg,
arg_count,
) {
Ok(()) => continue,
Err(e) => return Err(e),
}
} else if obj.sub_module_index() > 0 {
// 1-indexed sub_module_index (0 = not a bytecode function)
let sub_idx = obj.sub_module_index() as usize - 1;
if sub_idx >= self.sub_modules.len() {
return Err(format!(
"CALL: sub_module_index {} out of bounds (max {})",
sub_idx,
self.sub_modules.len()
));
}
if self.frames.len() >= self.kernel.config.max_call_depth {
return Err(
"RangeError: Maximum call stack size exceeded".into()
);
}
// Clone sub_module data before mutably borrowing self
let sub_bytecode = self.sub_modules[sub_idx].bytecode.clone();
let sub_n_args = self.sub_modules[sub_idx].n_args as usize;
let sub_n_registers = self.sub_modules[sub_idx].n_registers;
let sub_constants = self.sub_modules[sub_idx].constants.clone();
let sub_param_base =
self.sub_modules[sub_idx].param_base as usize;
let sub_is_arrow = self.sub_modules[sub_idx].is_arrow;
let caller_reg_limit = self.active_reg_limit.max(1);
let saved_regs = self.regs[..caller_reg_limit as usize]
.to_vec()
.into_boxed_slice();
let saved_this = self.regs[254];
let saved_new_target = self.regs[255];
// Copy args into the callee's parameter register window.
for i in 0..sub_n_args {
let src_reg = first_arg_reg.wrapping_add(i as u8) as usize;
self.regs[sub_param_base + i] = self.regs[src_reg];
}
// Set this (reg 254 convention).
// Arrow functions use captured lexical `this` (D-01).
self.regs[254] = if sub_is_arrow {
obj.captured_this()
} else {
callee
};
self.regs[255] = JsValue::undefined();
// Save current bytecode/constants
self.saved_bytecode_stack
.push(std::mem::take(&mut self.bytecode));
self.saved_constants_stack
.push(std::mem::take(&mut self.constants));
// Push call frame
self.frames.push(CallFrame {
return_addr: self.pc,
function_name: self.sub_modules[sub_idx]
.function_name
.as_deref()
.map(|name| self.kernel.string_forge().intern(name).0)
.unwrap_or(0),
caller_reg_limit,
saved_regs,
saved_this,
saved_new_target,
});
// Convert sub_module constants
self.bytecode = sub_bytecode;
self.constants = sub_constants
.iter()
.map(|c| match c {
Constant::Number(v) => JsValue::float(*v),
Constant::Int(v) => JsValue::int(*v),
Constant::String(s) => self.intern(s),
Constant::Boolean(b) => JsValue::bool(*b),
Constant::Null => JsValue::null(),
Constant::Undefined => JsValue::undefined(),
Constant::BytecodeFunc(idx) => {
let idx_usize = *idx as usize;
let nested_is_arrow = if idx_usize > 0
&& idx_usize <= self.sub_modules.len()
{
self.sub_modules[idx_usize - 1].is_arrow
} else {
false
};
self.create_function_object(*idx, nested_is_arrow)
}
Constant::RegExp(_, _) => JsValue::undefined(),
})
.collect();
// Pre-fill builtin registers from the global object
// (same as Vm::run does for the main module).
for (name, reg) in &self.sub_modules[sub_idx].builtin_reg_map {
let si = self.kernel.string_forge().intern(name.as_str()).0;
let global = self.kernel.global_object();
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(global.shape_id(), si)
{
self.regs[*reg as usize] = global.get_prop_at(pos);
}
}
self.active_reg_limit = sub_n_registers.max(1);
self.pc = 0;
continue;
}
}
}
}
throw_err!(self, TypeError, "CALL target is not callable");
}
OpCode::CALL_NATIVE => {
let callee_reg = rd;
let this_reg = a as u8;
let first_arg_reg = b as u8;
let callee = self.regs[callee_reg];
if !callee.is_object() {
throw_err!(self, TypeError, "CALL_NATIVE target is not an object");
}
let obj_ptr = callee.as_js_object_ptr();
if obj_ptr.is_null() {
throw_err!(self, TypeError, "CALL_NATIVE target is null");
}
let obj = unsafe { &*obj_ptr };
if !obj.is_function() || obj.native_fn().is_none() {
throw_err!(
self,
TypeError,
"CALL_NATIVE target is not a native function"
);
}
let ext = self.bytecode[self.pc];
self.pc += 1;
let arg_count = (ext & 0xFF) as usize;
self.dispatch_native_call(obj, callee, this_reg, first_arg_reg, arg_count)?;
}
OpCode::NEW_EXPRESSION => {
let constructor_reg = a;
let first_arg_reg = b as u8;
let constructor = self.regs[constructor_reg];
if !constructor.is_object() {
throw_err!(
self,
TypeError,
"NEW_EXPRESSION: constructor is not an object"
);
}
let ctor_ptr = constructor.as_js_object_ptr();
if ctor_ptr.is_null() {
throw_err!(self, TypeError, "NEW_EXPRESSION: constructor is null");
}
let ctor_obj = unsafe { &*ctor_ptr };
if !ctor_obj.is_function() {
throw_err!(
self,
TypeError,
"NEW_EXPRESSION: constructor is not a function"
);
}
// Arrow functions cannot be used as constructors (D-03)
if ctor_obj.is_arrow() {
throw_err!(
self,
TypeError,
"arrow functions cannot be used as constructors"
);
}
// Read extension word for arg_count
let ext = self.bytecode[self.pc];
self.pc += 1;
let arg_count = (ext & 0xFF) as usize;
// Create new empty object
let proto_ptr = &*self.object_prototype as *const JsObject as *mut JsObject;
let new_obj = self.epoch.alloc(JsObject::new_empty(
EMPTY_SHAPE_ID,
JsValue::from_js_object(proto_ptr),
));
// Look up constructor.prototype and set as proto of new object
let proto_si = self.kernel.string_forge().intern("prototype").0;
if let Some(proto_val) = self.resolve_property(ctor_obj, proto_si) {
if proto_val.is_object() {
let new_obj_mut = unsafe { &mut *new_obj };
let proto_obj_ptr = proto_val.as_js_object_ptr();
let _ = new_obj_mut.set_proto(JsValue::from_js_object(proto_obj_ptr));
}
}
// If constructor has native_fn, call it with this=new_obj
if ctor_obj.native_fn().is_some() {
let new_obj_val = JsValue::object(new_obj as *mut u8);
self.regs[255] = new_obj_val;
let mut args_buf = [0u8; 257];
args_buf[0] = 255u8;
for i in 0..arg_count.min(256) {
args_buf[i + 1] = first_arg_reg.wrapping_add(i as u8);
}
let args_slice = &args_buf[..arg_count + 1];
let func: NativeFn =
unsafe { std::mem::transmute(ctor_obj.native_fn().unwrap()) };
self.regs[254] = constructor;
match func(self, args_slice) {
Ok(val) => {
if val.is_object() {
self.regs[rd] = val;
} else {
self.regs[rd] = new_obj_val;
}
}
Err(err_val) => {
self.exception_value = Some(err_val);
self.pending_error_kind = Some("Error");
match self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}
}
} else {
let error = crate::builtins::error::create_error(
self,
"NEW_EXPRESSION: bytecode constructors not yet supported",
);
self.exception_value = Some(error);
self.pending_error_kind = Some("Error");
match self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}
}
OpCode::RETURN => {
let result = self.regs[rd];
if let Some(frame) = self.frames.pop() {
// Restore caller's saved bytecode and constants
if let Some(saved_bc) = self.saved_bytecode_stack.pop() {
self.bytecode = saved_bc;
}
if let Some(saved_consts) = self.saved_constants_stack.pop() {
self.constants = saved_consts;
}
let restore_len = frame.saved_regs.len();
self.regs[..restore_len].copy_from_slice(&frame.saved_regs);
self.regs[254] = frame.saved_this;
self.regs[255] = frame.saved_new_target;
self.active_reg_limit = frame.caller_reg_limit;
// Restore caller's pc and merge result into caller's regs[0].
self.pc = frame.return_addr;
self.regs[0] = result;
} else {
return Ok(result);
}
}
OpCode::IC_GET_PROP => {
let val = self.regs[a];
let obj_ptr = val.as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
if val.is_string() {
let proto_ptr =
self.kernel.builtin_world().string_proto.as_ptr() as *mut JsObject;
let proto = unsafe { &*proto_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
if let Some(resolved) = self.resolve_property(proto, prop_name_si) {
self.regs[a] = resolved;
self.pc += 3;
continue;
}
}
if val.is_int() || val.is_double() {
let proto_ptr =
self.kernel.builtin_world().number_proto.as_ptr() as *mut JsObject;
let proto = unsafe { &*proto_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
if let Some(resolved) = self.resolve_property(proto, prop_name_si) {
self.regs[a] = resolved;
self.pc += 3;
continue;
}
}
throw_err!(self, TypeError, "IC_GET_PROP on non-object");
}
let obj = unsafe { &*obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let ext0 = self.bytecode[self.pc];
let ext1 = self.bytecode[self.pc + 1];
let ext2 = self.bytecode[self.pc + 2];
self.pc += 3;
let cached_shape_id = ext0 & 0x00FF_FFFF;
let cached_ptr = ((ext2 as u64) << 32) | (ext1 as u64);
if cached_shape_id != 0 && cached_shape_id == obj.shape_id() && cached_ptr != 0
{
self.regs[a] = unsafe { *(cached_ptr as *const JsValue) };
} else if let Some(template) =
self.kernel.prop_forge().get_template(obj.shape_id())
{
if template.prop_name == prop_name_si {
let pos = template.position as usize;
if let Some(vec) = obj.hash_props_vec() {
if pos < vec.len() {
let ptr = &*vec[pos] as *const JsValue;
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
self.regs[a] = unsafe { *(ptr) };
} else {
self.regs[a] = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
}
} else {
self.regs[a] = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
}
} else {
self.regs[a] = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
}
} else if let Some(val) = self.resolve_property(obj, prop_name_si) {
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
if let Some(ptr) = obj.prop_ptr_at(pos) {
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
}
}
self.regs[a] = val;
} else {
self.regs[a] = JsValue::undefined();
}
}
OpCode::IC_SET_PROP => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "IC_SET_PROP on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let ext0 = self.bytecode[self.pc];
let ext1 = self.bytecode[self.pc + 1];
let ext2 = self.bytecode[self.pc + 2];
self.pc += 3;
let cached_shape_id = ext0 & 0x00FF_FFFF;
let cached_ptr = ((ext2 as u64) << 32) | (ext1 as u64);
if cached_shape_id != 0 && cached_shape_id == obj.shape_id() && cached_ptr != 0
{
unsafe {
*(cached_ptr as *mut JsValue) = self.regs[a];
}
} else {
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, self.regs[a]);
if let Some(ptr) = obj.prop_ptr_at(pos) {
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
}
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
let new_pos = obj.push_prop(self.regs[a]);
obj.bump_generation();
if let Some(ptr) = obj.prop_ptr_at(new_pos) {
self.bytecode[self.pc - 3] = new_shape_id & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
self.kernel.prop_forge().upsert(
new_shape_id,
PropTemplate {
shape_id: new_shape_id,
prop_name: prop_name_si,
position: new_pos,
generation: obj.generation(),
},
);
}
}
}
}
OpCode::GET_PROP => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "GET_PROP on non-object");
}
let obj = unsafe { &*obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
self.regs[a] = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
}
OpCode::SET_PROP => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "SET_PROP on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, self.regs[a]);
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
obj.push_prop(self.regs[a]);
obj.bump_generation();
}
}
OpCode::GET_PROP_DYNAMIC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "GET_PROP_DYNAMIC on non-object");
}
let obj = unsafe { &*obj_ptr };
let key_val = self.regs[a];
let prop_name_si = self.property_key_si(key_val);
self.regs[b] = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
}
OpCode::SET_PROP_DYNAMIC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "SET_PROP_DYNAMIC on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let key_val = self.regs[a];
let prop_name_si = self.property_key_si(key_val);
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, self.regs[b]);
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
obj.push_prop(self.regs[b]);
obj.bump_generation();
}
}
OpCode::NEW_OBJECT => {
let proto_ptr = &*self.object_prototype as *const JsObject as *mut JsObject;
let obj = self.epoch.alloc(JsObject::new_empty(
EMPTY_SHAPE_ID,
JsValue::from_js_object(proto_ptr),
));
self.regs[rd] = JsValue::object(obj as *mut u8);
}
OpCode::NEW_ARRAY => {
let proto_ptr =
self.kernel.builtin_world().array_proto.as_ptr() as *mut JsObject;
let n = opcode::imm16(instr) as usize;
let bump = self.epoch.bump();
let obj = self.epoch.alloc(JsObject::new_array(
EMPTY_SHAPE_ID,
JsValue::from_js_object(proto_ptr),
n,
bump,
));
self.regs[rd] = JsValue::object(obj as *mut u8);
}
OpCode::SET_ELEM => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "SET_ELEM on non-object");
}
let idx = self.regs[a].as_int().max(0) as u32;
let obj = unsafe { &mut *obj_ptr };
obj.set_prop_at(idx, self.regs[b]);
}
OpCode::COMPOUND_ADD => {
let lhs = self.regs[rd];
let rhs = self.regs[a];
if lhs.is_string() || rhs.is_string() {
let ls = coercion::to_string(self.kernel.string_forge().as_ref(), lhs);
let rs = coercion::to_string(self.kernel.string_forge().as_ref(), rhs);
let concat = format!("{ls}{rs}");
self.regs[rd] = self.intern(&concat);
} else {
let ln = coercion::to_number(lhs, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(rhs, self.kernel.string_forge().as_ref());
self.regs[rd] = JsValue::float(ln + rn);
}
}
OpCode::COMPOUND_SUB => {
compound_arith!(self, rd, a, -);
}
OpCode::COMPOUND_MUL => {
compound_arith!(self, rd, a, *);
}
OpCode::COMPOUND_DIV => {
compound_arith!(self, rd, a, /);
}
OpCode::COMPOUND_MOD => {
compound_arith!(self, rd, a, %);
}
OpCode::COMPOUND_EXP => {
let l = coercion::to_number(self.regs[rd], self.kernel.string_forge().as_ref());
let r = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
self.regs[rd] = JsValue::float(l.powf(r));
}
OpCode::TYPEOF => {
self.dispatch_typeof(rd, a);
}
OpCode::VOID => {
self.regs[rd] = JsValue::undefined();
}
OpCode::TEMPLATE_STR => {
// Read header ext word: (segment_count << 16) | (total_len_hint & 0xFFFF)
let header = self.bytecode[self.pc];
self.pc += 1;
let segment_count = (header >> 16) as usize;
let len_hint = (header & 0xFFFF) as usize;
// Build result string
let mut result = String::with_capacity(len_hint.max(16));
for _ in 0..segment_count {
let seg = self.bytecode[self.pc];
self.pc += 1;
if (seg >> 31) == 1 {
// Expression: register value
let reg = (seg & 0x7F) as u8;
let val = self.regs[reg as usize];
let s = if val.is_string() {
self.kernel()
.string_forge()
.lookup(val.as_string_index())
.unwrap_or_default()
} else {
format!("{}", val)
};
result.push_str(&s);
} else {
// Quasi: constant string
let const_idx = (seg & 0x7FFF_FFFF) as usize;
if const_idx < self.constants.len() {
let val = self.constants[const_idx];
if val.is_string() {
let s = self
.kernel()
.string_forge()
.lookup(val.as_string_index())
.unwrap_or_default();
result.push_str(&s);
}
}
}
}
let si = self.kernel.string_forge().intern(&result).0;
self.regs[rd] = JsValue::string(si, 0);
}
OpCode::DELETE_PROP_STATIC => {
let obj_val = self.regs[a];
if !obj_val.is_object() {
self.regs[rd] = JsValue::bool(true);
} else {
let obj_ptr = obj_val.as_js_object_ptr();
let obj = unsafe { &mut *obj_ptr };
let ext = self.bytecode[self.pc];
self.pc += 1;
let const_idx = ext as usize;
let prop_name_val = self.constants[const_idx];
if !prop_name_val.is_string() {
self.regs[rd] = JsValue::bool(true);
continue;
}
let prop_name_si = prop_name_val.as_string_index();
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, JsValue::undefined());
}
self.regs[rd] = JsValue::bool(true);
}
}
OpCode::DELETE_PROP_DYNAMIC => {
let obj_val = self.regs[a];
if !obj_val.is_object() {
self.regs[rd] = JsValue::bool(true);
} else {
let key_val = self.regs[b];
let prop_name_si = self.property_key_si(key_val);
let obj_ptr = obj_val.as_js_object_ptr();
let obj = unsafe { &mut *obj_ptr };
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, JsValue::undefined());
}
self.regs[rd] = JsValue::bool(true);
}
}
OpCode::INSTANCEOF => {
let lhs_val = self.regs[a];
let rhs_val = self.regs[b];
if !rhs_val.is_object() {
throw_err!(
self,
TypeError,
"INSTANCEOF right-hand side is not callable"
);
}
if !lhs_val.is_object() {
self.regs[rd] = JsValue::bool(false);
continue;
}
let rhs_obj = unsafe { &*rhs_val.as_js_object_ptr() };
let proto_si = self.kernel.string_forge().intern("prototype").0;
let ctor_proto = self.resolve_property(rhs_obj, proto_si);
let ctor_proto_ptr = match ctor_proto {
Some(v) if v.is_object() => v.as_js_object_ptr(),
_ => {
self.regs[rd] = JsValue::bool(false);
continue;
}
};
let mut proto = unsafe { &*lhs_val.as_js_object_ptr() }.proto();
loop {
if !proto.is_object() {
self.regs[rd] = JsValue::bool(false);
break;
}
let proto_ptr = proto.as_js_object_ptr();
if proto_ptr == ctor_proto_ptr {
self.regs[rd] = JsValue::bool(true);
break;
}
proto = unsafe { &*proto_ptr }.proto();
}
}
OpCode::IN => {
let key_val = self.regs[a];
let obj_ptr = self.regs[b].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "IN right-hand side is not an object");
}
let obj = unsafe { &*obj_ptr };
let prop_name_si = self.property_key_si(key_val);
let found = self.resolve_property(obj, prop_name_si).is_some();
self.regs[rd] = JsValue::bool(found);
}
OpCode::NOT => {
self.dispatch_not(rd, a);
}
OpCode::AND => {
self.dispatch_and(rd, a, b);
}
OpCode::OR => {
self.dispatch_or(rd, a, b);
}
OpCode::INC_PRE => {
let n = coercion::to_number(self.regs[rd], self.kernel.string_forge().as_ref());
let result = JsValue::float(n + 1.0);
self.regs[rd] = result;
self.regs[a] = result;
}
OpCode::INC_POST => {
let n = coercion::to_number(self.regs[rd], self.kernel.string_forge().as_ref());
self.regs[a] = JsValue::float(n);
self.regs[rd] = JsValue::float(n + 1.0);
}
OpCode::DEC_PRE => {
let n = coercion::to_number(self.regs[rd], self.kernel.string_forge().as_ref());
let result = JsValue::float(n - 1.0);
self.regs[rd] = result;
self.regs[a] = result;
}
OpCode::DEC_POST => {
let n = coercion::to_number(self.regs[rd], self.kernel.string_forge().as_ref());
self.regs[a] = JsValue::float(n);
self.regs[rd] = JsValue::float(n - 1.0);
}
OpCode::MEMBER_INC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "MEMBER_INC on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let n = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let new_val = JsValue::float(n + 1.0);
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, new_val);
if let Some(ptr) = obj.prop_ptr_at(pos) {
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
}
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
let new_pos = obj.push_prop(new_val);
obj.bump_generation();
if let Some(ptr) = obj.prop_ptr_at(new_pos) {
self.bytecode[self.pc - 3] = new_shape_id & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
self.kernel.prop_forge().upsert(
new_shape_id,
PropTemplate {
shape_id: new_shape_id,
prop_name: prop_name_si,
position: new_pos,
generation: obj.generation(),
},
);
}
self.regs[a] = new_val;
continue;
};
self.regs[a] = new_val;
}
OpCode::MEMBER_DEC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "MEMBER_DEC on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let n = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let new_val = JsValue::float(n - 1.0);
if let Some(pos) = self
.kernel
.shape_forge()
.lookup_position(obj.shape_id(), prop_name_si)
{
obj.set_prop_at(pos, new_val);
if let Some(ptr) = obj.prop_ptr_at(pos) {
self.bytecode[self.pc - 3] = obj.shape_id() & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
}
} else {
let new_shape_id = self
.kernel
.shape_forge()
.make_shape(obj.shape_id(), prop_name_si);
obj.set_shape_id(new_shape_id);
let new_pos = obj.push_prop(new_val);
obj.bump_generation();
if let Some(ptr) = obj.prop_ptr_at(new_pos) {
self.bytecode[self.pc - 3] = new_shape_id & 0x00FF_FFFF;
self.bytecode[self.pc - 2] = ptr as u32;
self.bytecode[self.pc - 1] = (ptr as u64 >> 32) as u32;
self.kernel.prop_forge().upsert(
new_shape_id,
PropTemplate {
shape_id: new_shape_id,
prop_name: prop_name_si,
position: new_pos,
generation: obj.generation(),
},
);
}
self.regs[a] = new_val;
continue;
};
self.regs[a] = new_val;
}
OpCode::DYN_MEMBER_INC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "DYN_MEMBER_INC on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let key_val = self.regs[a];
let prop_name_si = self.property_key_si(key_val);
let prop_val = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
let n = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let new_val = JsValue::float(n + 1.0);
set_or_create_prop!(self, obj, prop_name_si, new_val);
self.regs[b] = new_val;
}
OpCode::DYN_MEMBER_DEC => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "DYN_MEMBER_DEC on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let key_val = self.regs[a];
let prop_name_si = self.property_key_si(key_val);
let prop_val = self
.resolve_property(obj, prop_name_si)
.unwrap_or(JsValue::undefined());
let n = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let new_val = JsValue::float(n - 1.0);
set_or_create_prop!(self, obj, prop_name_si, new_val);
self.regs[b] = new_val;
}
OpCode::COMPOUND_MEMBER_ADD => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_ADD on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let rhs = self.regs[a];
let new_val = if prop_val.is_string() || rhs.is_string() {
let ls = coercion::to_string(self.kernel.string_forge().as_ref(), prop_val);
let rs = coercion::to_string(self.kernel.string_forge().as_ref(), rhs);
let concat = format!("{ls}{rs}");
self.intern(&concat)
} else {
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(rhs, self.kernel.string_forge().as_ref());
JsValue::float(ln + rn)
};
self.set_member_prop(obj, prop_name_si, new_val)?;
self.regs[a] = new_val;
}
OpCode::COMPOUND_MEMBER_SUB => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_SUB on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
let new_val = JsValue::float(ln - rn);
self.regs[a] = new_val;
self.set_member_prop(obj, prop_name_si, new_val)?;
}
OpCode::COMPOUND_MEMBER_MUL => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_MUL on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
let new_val = JsValue::float(ln * rn);
self.regs[a] = new_val;
self.set_member_prop(obj, prop_name_si, new_val)?;
}
OpCode::COMPOUND_MEMBER_DIV => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_DIV on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
let new_val = JsValue::float(ln / rn);
self.regs[a] = new_val;
self.set_member_prop(obj, prop_name_si, new_val)?;
}
OpCode::COMPOUND_MEMBER_MOD => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_MOD on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
let new_val = JsValue::float(ln % rn);
self.regs[a] = new_val;
self.set_member_prop(obj, prop_name_si, new_val)?;
}
OpCode::COMPOUND_MEMBER_EXP => {
let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
throw_err!(self, TypeError, "COMPOUND_MEMBER_EXP on non-object");
}
let obj = unsafe { &mut *obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b]);
let prop_val = member_read_prop!(self, obj, prop_name_si);
let ln = coercion::to_number(prop_val, self.kernel.string_forge().as_ref());
let rn = coercion::to_number(self.regs[a], self.kernel.string_forge().as_ref());
let new_val = JsValue::float(ln.powf(rn));
self.regs[a] = new_val;
self.set_member_prop(obj, prop_name_si, new_val)?;
}
OpCode::FOR_IN_INIT => {
let obj_val = self.regs[a];
if !obj_val.is_object() {
throw_err!(self, TypeError, "for-in right-hand side is not an object");
}
let mut keys_vec = bumpalo::collections::Vec::new_in(self.epoch.bump());
let mut seen = std::collections::HashSet::new();
let mut current = obj_val;
loop {
if !current.is_object() {
break;
}
let cur = unsafe { &*current.as_js_object_ptr() };
let mut cursor = Some(cur.shape_id());
while let Some(id) = cursor {
if id == EMPTY_SHAPE_ID {
break;
}
if let Some(shape) = self.kernel.shape_forge().get_shape(id) {
if shape.property_name != u32::MAX
&& seen.insert(shape.property_name)
{
let hash = self
.kernel
.string_forge()
.get_hash(shape.property_name)
.unwrap_or(0);
keys_vec.push(JsValue::string(shape.property_name, hash));
}
cursor = shape.parent;
} else {
break;
}
}
current = cur.proto();
}
let iter = self.epoch.alloc(ForInIter {
keys: keys_vec,
index: 0,
});
self.for_in_iters.push(iter as *mut u8);
}
OpCode::FOR_IN_NEXT => {
let iter_ptr = self
.for_in_iters
.last()
.copied()
.map(|p| p as *mut ForInIter)
.unwrap_or(std::ptr::null_mut());
if iter_ptr.is_null() {
return Err("FOR_IN_NEXT without active iterator".into());
}
let iter = unsafe { &mut *iter_ptr };
if iter.index < iter.keys.len() {
self.regs[rd] = iter.keys[iter.index];
iter.index += 1;
} else {
self.regs[rd] = JsValue::undefined();
}
}
OpCode::FOR_IN_DONE => {
let iter_ptr = self
.for_in_iters
.last()
.copied()
.map(|p| p as *mut ForInIter)
.unwrap_or(std::ptr::null_mut());
if iter_ptr.is_null() {
self.regs[rd] = JsValue::bool(true);
} else {
let iter = unsafe { &*iter_ptr };
self.regs[rd] = JsValue::bool(iter.index >= iter.keys.len());
}
}
OpCode::FOR_IN_CLEANUP => {
self.for_in_iters.pop();
}
OpCode::FOR_OF_INIT => {}
OpCode::FOR_OF_NEXT => {}
OpCode::FOR_OF_DONE => {}
OpCode::FOR_OF_CLOSE => {}
OpCode::THROW => {
let exc_value = self.regs[rd];
self.exception_value = Some(exc_value);
self.pending_error_kind = Some(self.thrown_error_kind(exc_value));
match self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}
OpCode::TRY_BEGIN => {
let offset = opcode::offset16(instr) as isize;
let catch_pc = if offset == 0 {
None
} else {
Some(((self.pc as isize) + offset - 1) as usize)
};
self.try_stack.push(TryHandler {
catch_pc,
finally_pc: None,
frame_depth: self.frames.len(),
});
}
OpCode::TRY_END => {
self.try_stack.pop();
}
OpCode::TRY_FINALLY_BEGIN => {
let offset = opcode::offset16(instr) as isize;
let finally_pc = ((self.pc as isize) + offset - 1) as usize;
self.try_stack.push(TryHandler {
catch_pc: None,
finally_pc: Some(finally_pc),
frame_depth: self.frames.len(),
});
}
OpCode::TRY_FINALLY_END => {
self.try_stack.pop();
if self.pending_exception.is_some() && self.exception_value.is_none() {
self.exception_value = self.pending_exception.take();
match self.unwind() {
Ok(()) => continue,
Err(e) => return Err(e),
}
}
self.pending_exception = None;
}
_ => {
if !op.is_implemented() {
return Ok(JsValue::undefined());
}
return Err(format!("opcode {op} not yet implemented"));
}
}
}
}
}
impl Default for Vm {
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
mod tests {
use super::{opcode, JsValue, TryHandler, Vm};
#[test]
fn reset_clears_runtime_state_like_rerun() {
let mut vm = Vm::new();
vm.regs[1] = JsValue::int(7);
vm.pc = 3;
vm.frames.push(super::CallFrame {
return_addr: 1,
function_name: 0,
caller_reg_limit: 2,
saved_regs: vec![JsValue::undefined()].into_boxed_slice(),
saved_this: JsValue::undefined(),
saved_new_target: JsValue::undefined(),
});
vm.for_in_iters.push(std::ptr::dangling_mut::<u8>());
vm.for_of_iters.push(std::ptr::dangling_mut::<u8>());
vm.saved_bytecode_stack
.push(vec![opcode::encode(opcode::OpCode::HALT, 0, 0, 0)]);
vm.saved_constants_stack.push(vec![JsValue::int(1)]);
vm.try_stack.push(TryHandler {
catch_pc: Some(1),
finally_pc: None,
frame_depth: 0,
});
vm.exception_value = Some(JsValue::int(2));
vm.pending_exception = Some(JsValue::int(3));
vm.pending_error_kind = Some("TypeError");
vm.reset();
assert_eq!(vm.pc, 0);
assert!(vm.frames.is_empty());
assert!(vm.for_in_iters.is_empty());
assert!(vm.for_of_iters.is_empty());
assert!(vm.saved_bytecode_stack.is_empty());
assert!(vm.saved_constants_stack.is_empty());
assert!(vm.try_stack.is_empty());
assert!(vm.exception_value.is_none());
assert!(vm.pending_exception.is_none());
assert!(vm.pending_error_kind.is_none());
assert!(vm.bytecode.is_empty());
assert!(vm.constants.is_empty());
}
}
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