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perf: 属性键解析移出 IC 命中路径

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彭俊皓
2026-08-13 15:54:46 +08:00
parent 6b9371ed4a
commit 18a0732a91
1 changed files with 78 additions and 66 deletions
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crates/oxide_vm/src/dispatch/property.rs
+78 -66
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@@ -308,10 +308,11 @@ impl Vm {
}
let obj = unsafe { &*obj_ptr };
let prop_name_si = self.property_key_si(self.regs[b])?;
let (cached_shape_id, cached_slot, cached_depth) = ic_helper::read_ic_entry(&self.bytecode, &mut self.pc);
let ic_pc = self.pc;
if obj.has_prop_meta() {
// meta 对象整对象走慢路径，此时才解析键。
let prop_name_si = self.property_key_si(self.regs[b])?;
let val = self.ordinary_get_with_target(obj, prop_name_si, val, a as u8)?;
if self.accessor_frame_target_reg.take().is_none() {
self.regs[a] = val;
@@ -320,66 +321,73 @@ impl Vm {
}
if let Some(value) = ic_get_hit(obj, cached_shape_id, cached_slot, cached_depth) {
// 命中路径只比对 shape_id，不解析键。
self.regs[a] = value;
self.profiling.record_ic_hit();
ic_trace!("IC_GET hit shape={} slot={} depth={}", cached_shape_id, cached_slot, cached_depth);
} else if let Some(template) = self.kernel_core.prop_forge().get_template(obj.shape_id()) {
self.profiling.record_ic_miss();
prop_cache_miss();
if template.prop_name == prop_name_si {
if template.position < obj.prop_vec_len() as u32 {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, obj.shape_id(), template.position, 0);
ic_debug!(
"IC_GET propforge hit shape={} prop={} slot={}",
obj.shape_id(),
prop_name_si,
template.position
);
self.regs[a] = obj.get_prop_shape(template.position);
} else {
// miss 分支才解析键（IC 站点键恒为编译期字符串常量，延后解析无 ToPrimitive 副作用）。
let prop_name_si = self.property_key_si(self.regs[b])?;
if let Some(template) = self.kernel_core.prop_forge().get_template(obj.shape_id()) {
self.profiling.record_ic_miss();
prop_cache_miss();
if template.prop_name == prop_name_si {
if template.position < obj.prop_vec_len() as u32 {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, obj.shape_id(), template.position, 0);
ic_debug!(
"IC_GET propforge hit shape={} prop={} slot={}",
obj.shape_id(),
prop_name_si,
template.position
);
self.regs[a] = obj.get_prop_shape(template.position);
} else {
ic_debug!("IC_GET miss shape={} prop={}", obj.shape_id(), prop_name_si);
self.regs[a] = self.ordinary_get(obj, prop_name_si, val)?;
}
} else {
ic_debug!("IC_GET miss shape={} prop={}", obj.shape_id(), prop_name_si);
self.regs[a] = self.ordinary_get(obj, prop_name_si, val)?;
}
} else {
prop_cache_miss();
ic_debug!("IC_GET miss shape={} prop={}", obj.shape_id(), prop_name_si);
self.regs[a] = self.ordinary_get(obj, prop_name_si, val)?;
}
} else {
prop_cache_miss();
ic_debug!("IC_GET miss shape={} prop={}", obj.shape_id(), prop_name_si);
let resolved = self.ordinary_get(obj, prop_name_si, val)?;
// 先试自身属性（快路径，depth=0）。
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
if !obj.is_accessor_meta(pos) {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, obj.shape_id(), pos, 0);
ic_debug!("IC_GET write-back own shape={} slot={}", obj.shape_id(), pos);
}
} else {
// 沿原型链查找真正拥有该属性的对象。
let mut cursor = obj.proto().as_js_object_ptr();
let mut depth = 1u8;
while !cursor.is_null() {
let co_ref = unsafe { &*cursor };
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(co_ref.shape_id(), prop_name_si) {
if !co_ref.is_accessor_meta(pos) {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, co_ref.shape_id(), pos, depth);
ic_debug!(
"IC_GET write-back proto shape={} slot={} depth={}",
co_ref.shape_id(),
pos,
depth
);
let resolved = self.ordinary_get(obj, prop_name_si, val)?;
// 先试自身属性（快路径，depth=0）。
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
if !obj.is_accessor_meta(pos) {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, obj.shape_id(), pos, 0);
ic_debug!("IC_GET write-back own shape={} slot={}", obj.shape_id(), pos);
}
} else {
// 沿原型链查找真正拥有该属性的对象。
let mut cursor = obj.proto().as_js_object_ptr();
let mut depth = 1u8;
while !cursor.is_null() {
let co_ref = unsafe { &*cursor };
if let Some(pos) =
self.kernel_core.shape_forge().lookup_position(co_ref.shape_id(), prop_name_si)
{
if !co_ref.is_accessor_meta(pos) {
ic_helper::write_ic_back(self.bytecode_mut(), ic_pc, co_ref.shape_id(), pos, depth);
ic_debug!(
"IC_GET write-back proto shape={} slot={} depth={}",
co_ref.shape_id(),
pos,
depth
);
}
break;
}
break;
if !co_ref.proto().is_object() {
break;
}
cursor = co_ref.proto().as_js_object_ptr();
depth += 1;
}
if !co_ref.proto().is_object() {
break;
}
cursor = co_ref.proto().as_js_object_ptr();
depth += 1;
}
self.regs[a] = resolved;
}
self.regs[a] = resolved;
}
Ok(())
@@ -390,34 +398,38 @@ impl Vm {
return Ok(());
};
let prop_name_si = self.property_key_si(self.regs[b])?;
if self.kernel_core.perm_interner().lookup(prop_name_si) == Some("__proto__") {
let proto_value = self.promote_if_needed_for_write_ptr(obj_ptr, self.regs[a]);
if self.is_object_prototype(obj_ptr) && !proto_value.is_null() {
self.raise_type_error("Object.prototype.__proto__ is immutable")?;
self.pc += 3;
return Ok(());
}
let obj = unsafe { &mut *obj_ptr };
obj.set_proto(proto_value).map_err(|e| e.to_string())?;
self.pc += 3;
return Ok(());
}
// read_ic_entry 先消费 3 扩展字，命中路径无需解析键。
let (cached_shape_id, cached_slot, cached_depth) = ic_helper::read_ic_entry(&self.bytecode, &mut self.pc);
let ic_pc = self.pc;
let value = self.promote_if_needed_for_write_ptr(obj_ptr, self.regs[a]);
let receiver = self.regs[rd];
let obj = unsafe { &mut *obj_ptr };
// 命中路径零键零拦截：__proto__ 赋值从不写 IC，缓存槽必为数据槽。
if !obj.has_prop_meta() && ic_set_hit(obj, cached_shape_id, cached_slot, cached_depth, value) {
self.profiling.record_ic_hit();
ic_trace!("IC_SET hit shape={} slot={} depth={}", cached_shape_id, cached_slot, cached_depth);
return Ok(());
}
// 慢路径（has_prop_meta / miss）才解析键并拦截 __proto__ 赋值，须先于写槽，
// 防 __proto__ 落入数据槽。
let prop_name_si = self.property_key_si(self.regs[b])?;
if self.kernel_core.perm_interner().lookup(prop_name_si) == Some("__proto__") {
if self.is_object_prototype(obj_ptr) && !value.is_null() {
self.raise_type_error("Object.prototype.__proto__ is immutable")?;
return Ok(());
}
obj.set_proto(value).map_err(|e| e.to_string())?;
return Ok(());
}
if obj.has_prop_meta() {
self.ordinary_set_dispatch(obj, prop_name_si, value, receiver)?;
return Ok(());
}
if ic_set_hit(obj, cached_shape_id, cached_slot, cached_depth, value) {
self.profiling.record_ic_hit();
ic_trace!("IC_SET hit shape={} slot={} depth={}", cached_shape_id, cached_slot, cached_depth);
} else if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
self.profiling.record_ic_miss();
prop_cache_miss();
obj.set_prop_shape(pos, value);