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refactor: 拆分剩余 dispatch 大分支并压缩 vm.rs

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This commit is contained in:
爱特每羊队
2026-06-14 00:35:41 +08:00
parent 2518b08be1
commit 2940d10a9e
3 changed files with 337 additions and 313 deletions
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crates/oxide_vm/src/lib.rs
+1
View File
@@ -7,6 +7,7 @@ mod dispatch;
pub mod native;
pub mod vm;
mod vm_dispatch_ctrl;
mod vm_dispatch_misc;
pub mod vm_pool;
mod vm_props;
mod vm_runtime;
crates/oxide_vm/src/vm.rs
+13 -313
View File
@@ -11,10 +11,9 @@ use crate::coercion;
use crate::native::{NativeFn, NativeResult};
use oxide_kernel::kernel::OxideKernel;
use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
use oxide_kernel::vm_debug;
use oxide_types::error::{JsError, JsErrorKind};
use oxide_types::mem::{Epoch, P};
use oxide_types::object::{JsObject, NativeFnPtr, PropAttributes};
use oxide_types::object::{JsObject, NativeFnPtr};
use oxide_types::value::JsValue;
/// Convert a `NativeFnPtr` to a callable `NativeFn`.
@@ -629,171 +628,11 @@ impl Vm {
self.dispatch_call_native(rd, a, b)?;
}
OpCode::NEW_EXPRESSION => {
let constructor_reg = a;
let first_arg_reg = b as u8;
vm_debug!("NEW_EXPRESSION rd={}", rd);
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];
// SAFETY: native_fn was set via set_native_fn with a valid NativeFn pointer;
// native_fn_ptr_to_fn is the single coercion point for NativeFnPtr → NativeFn.
let func: NativeFn = unsafe { native_fn_ptr_to_fn(ctor_obj.native_fn().unwrap()) };
self.regs[254] = constructor;
match func(self, args_slice) {
NativeResult::Ok(val) => {
if val.is_object() {
self.regs[rd] = val;
} else {
self.regs[rd] = new_obj_val;
}
}
NativeResult::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),
}
}
NativeResult::TailCall { .. } => {
throw_err!(self, TypeError, "constructor tail call not supported");
}
}
} else if ctor_obj.sub_module_index() > 0 {
let sub_idx = ctor_obj.sub_module_index() as usize - 1;
if sub_idx >= self.sub_modules.len() {
return Err(format!(
"NEW_EXPRESSION: 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());
}
let new_obj_val = JsValue::object(new_obj as *mut u8);
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 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];
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];
}
self.regs[254] = if ctor_obj.is_derived_constructor() {
JsValue::undefined()
} else {
new_obj_val
};
self.regs[255] = constructor;
let converted_sub_constants = self.convert_constants(&sub_constants)?;
self.saved_bytecode_stack.push(std::mem::take(&mut self.bytecode));
self.saved_constants_stack.push(std::mem::take(&mut self.constants));
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,
callee: constructor,
construct_result_reg: Some(rd as u8),
constructed_this: Some(new_obj_val),
is_derived_constructor: ctor_obj.is_derived_constructor(),
continuation: FrameContinuation::None,
});
self.bytecode = sub_bytecode;
self.constants = converted_sub_constants;
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;
} 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::NEW_EXPRESSION => match self.dispatch_new_expression(rd, a, b) {
Ok(true) => continue,
Ok(false) => {}
Err(e) => return Err(e),
},
OpCode::SUPER_CALL => {
let first_arg_reg = a as u8;
@@ -1079,42 +918,7 @@ impl Vm {
}
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);
self.dispatch_template_str(rd);
}
OpCode::DELETE_PROP_STATIC => {
@@ -1130,54 +934,11 @@ impl Vm {
}
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();
}
self.dispatch_instanceof(rd, a, b)?;
}
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);
self.dispatch_in(rd, a, b)?;
}
OpCode::NOT => {
@@ -1232,80 +993,19 @@ impl Vm {
}
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 enumerable = self
.kernel
.shape_forge()
.lookup_position(cur.shape_id(), shape.property_name)
.and_then(|pos| cur.prop_meta_at(pos))
.map(|meta| meta.attributes.enumerable())
.unwrap_or(PropAttributes::DEFAULT_DATA.enumerable());
if enumerable {
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 });
// SAFETY: ForInIter is arena-allocated and valid until `epoch.reset()`;
// dispatch clears `for_in_iters` before resetting the epoch.
self.for_in_iters.push(iter.cast::<ForInIter<'static>>());
self.dispatch_for_in_init(a)?;
}
OpCode::FOR_IN_NEXT => {
let iter_ptr = self.for_in_iters.last().copied().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();
}
self.dispatch_for_in_next(rd)?;
}
OpCode::FOR_IN_DONE => {
let iter_ptr = self.for_in_iters.last().copied().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());
}
self.dispatch_for_in_done(rd);
}
OpCode::FOR_IN_CLEANUP => {
self.for_in_iters.pop();
self.dispatch_for_in_cleanup();
}
OpCode::FOR_OF_INIT => {
crates/oxide_vm/src/vm_dispatch_misc.rs
+323
View File
@@ -0,0 +1,323 @@
use crate::native::{NativeFn, NativeResult};
use crate::vm::{native_fn_ptr_to_fn, CallFrame, ForInIter, FrameContinuation, Vm};
use oxide_types::object::{JsObject, PropAttributes};
use oxide_types::value::JsValue;
impl Vm {
pub(crate) fn dispatch_new_expression(&mut self, rd: usize, a: usize, b: usize) -> Result<bool, String> {
let constructor_reg = a;
let first_arg_reg = b as u8;
oxide_kernel::vm_debug!("NEW_EXPRESSION rd={}", rd);
let constructor = self.regs[constructor_reg];
if !constructor.is_object() {
return self
.raise_type_error("NEW_EXPRESSION: constructor is not an object")
.map(|_| true);
}
let ctor_ptr = constructor.as_js_object_ptr();
if ctor_ptr.is_null() {
return self.raise_type_error("NEW_EXPRESSION: constructor is null").map(|_| true);
}
let ctor_obj = unsafe { &*ctor_ptr };
if !ctor_obj.is_function() {
return self
.raise_type_error("NEW_EXPRESSION: constructor is not a function")
.map(|_| true);
}
if ctor_obj.is_arrow() {
return self
.raise_type_error("arrow functions cannot be used as constructors")
.map(|_| true);
}
let ext = self.bytecode[self.pc];
self.pc += 1;
let arg_count = (ext & 0xFF) as usize;
let proto_ptr = &*self.object_prototype as *const JsObject as *mut JsObject;
let new_obj = self.epoch.alloc(JsObject::new_empty(
oxide_kernel::shape_forge::EMPTY_SHAPE_ID,
JsValue::from_js_object(proto_ptr),
));
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 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 { native_fn_ptr_to_fn(ctor_obj.native_fn().unwrap()) };
self.regs[254] = constructor;
match func(self, args_slice) {
NativeResult::Ok(val) => {
self.regs[rd] = if val.is_object() { val } else { new_obj_val };
Ok(false)
}
NativeResult::Err(err_val) => {
self.exception_value = Some(err_val);
self.pending_error_kind = Some("Error");
self.unwind().map(|_| true)
}
NativeResult::TailCall { .. } => {
self.raise_type_error("constructor tail call not supported").map(|_| true)
}
}
} else if ctor_obj.sub_module_index() > 0 {
let sub_idx = ctor_obj.sub_module_index() as usize - 1;
if sub_idx >= self.sub_modules.len() {
return Err(format!(
"NEW_EXPRESSION: 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());
}
let new_obj_val = JsValue::object(new_obj as *mut u8);
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 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];
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];
}
self.regs[254] = if ctor_obj.is_derived_constructor() {
JsValue::undefined()
} else {
new_obj_val
};
self.regs[255] = constructor;
let converted_sub_constants = self.convert_constants(&sub_constants)?;
self.saved_bytecode_stack.push(std::mem::take(&mut self.bytecode));
self.saved_constants_stack.push(std::mem::take(&mut self.constants));
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,
callee: constructor,
construct_result_reg: Some(rd as u8),
constructed_this: Some(new_obj_val),
is_derived_constructor: ctor_obj.is_derived_constructor(),
continuation: FrameContinuation::None,
});
self.bytecode = sub_bytecode;
self.constants = converted_sub_constants;
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;
Ok(true)
} 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");
self.unwind().map(|_| true)
}
}
pub(crate) fn dispatch_template_str(&mut self, rd: usize) {
let header = self.bytecode[self.pc];
self.pc += 1;
let segment_count = (header >> 16) as usize;
let len_hint = (header & 0xFFFF) as usize;
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 {
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 {
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);
}
pub(crate) fn dispatch_instanceof(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
let lhs_val = self.regs[a];
let rhs_val = self.regs[b];
if !rhs_val.is_object() {
return self.raise_type_error("INSTANCEOF right-hand side is not callable");
}
if !lhs_val.is_object() {
self.regs[rd] = JsValue::bool(false);
return Ok(());
}
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);
return Ok(());
}
};
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();
}
Ok(())
}
pub(crate) fn dispatch_in(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
let key_val = self.regs[a];
let obj_ptr = self.regs[b].as_object_ptr() as *mut JsObject;
if obj_ptr.is_null() {
return self.raise_type_error("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);
Ok(())
}
pub(crate) fn dispatch_for_in_init(&mut self, a: usize) -> Result<(), String> {
let obj_val = self.regs[a];
if !obj_val.is_object() {
return self.raise_type_error("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 == oxide_kernel::shape_forge::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 enumerable = self
.kernel
.shape_forge()
.lookup_position(cur.shape_id(), shape.property_name)
.and_then(|pos| cur.prop_meta_at(pos))
.map(|meta| meta.attributes.enumerable())
.unwrap_or(PropAttributes::DEFAULT_DATA.enumerable());
if enumerable {
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.cast::<ForInIter<'static>>());
Ok(())
}
pub(crate) fn dispatch_for_in_next(&mut self, rd: usize) -> Result<(), String> {
let iter_ptr = self.for_in_iters.last().copied().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();
}
Ok(())
}
pub(crate) fn dispatch_for_in_done(&mut self, rd: usize) {
let iter_ptr = self.for_in_iters.last().copied().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());
}
}
pub(crate) fn dispatch_for_in_cleanup(&mut self) {
self.for_in_iters.pop();
}
}