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perf: 优化调用原型链的 IC 命中加速

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爱特每羊队
2026-06-30 21:41:05 +08:00
parent b6ce0f95bf
commit 7291fb237e
4 changed files with 145 additions and 50 deletions
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crates/oxide_vm/src/vm_props.rs
+38 -22
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@@ -209,38 +209,54 @@ impl Vm {
vm_trace!("read_member_prop: shape_id={} prop_name_si={}", obj.shape_id(), prop_name_si);
let ext0 = self.bytecode[self.pc];
let ext1 = self.bytecode[self.pc + 1];
let _ext2 = self.bytecode[self.pc + 2];
let ext2 = self.bytecode[self.pc + 2];
self.pc += 3;
if obj.has_prop_meta() {
return self.ordinary_get(obj, prop_name_si, receiver);
}
let cached_shape_id = ext0 & 0x00FF_FFFF;
let cached_slot = ext1;
let cached_depth = (ext2 & 0xFF) as u8;
let val =
if cached_shape_id != 0 && cached_shape_id == obj.shape_id() && cached_slot < obj.prop_vec_len() as u32 {
obj.get_prop_at(cached_slot)
} else if let Some(template) = self.kernel_core.prop_forge().get_template(obj.shape_id()) {
if template.prop_name != prop_name_si {
self.ordinary_get(obj, prop_name_si, receiver)?
} else if template.position < obj.prop_vec_len() as u32 {
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, obj.shape_id(), template.position);
obj.get_prop_at(template.position)
} else {
self.ordinary_get(obj, prop_name_si, receiver)?
}
let val = if let Some(v) = crate::ic_helper::ic_get_hit(obj, cached_shape_id, cached_slot, cached_depth) {
v
} else if let Some(template) = self.kernel_core.prop_forge().get_template(obj.shape_id()) {
if template.prop_name != prop_name_si {
self.proto_chain_ic_get(obj, prop_name_si, receiver)?
} else if template.position < obj.prop_vec_len() as u32 {
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, obj.shape_id(), template.position, 0);
obj.get_prop_at(template.position)
} else {
let resolved = self.ordinary_get(obj, prop_name_si, receiver)?;
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(obj.shape_id(), prop_name_si) {
if !obj.is_accessor_meta(pos) {
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, obj.shape_id(), pos);
}
}
resolved
};
self.proto_chain_ic_get(obj, prop_name_si, receiver)?
}
} else {
self.proto_chain_ic_get(obj, prop_name_si, receiver)?
};
Ok(val)
}
/// Perform ordinary_get and write back IC with proto chain depth.
fn proto_chain_ic_get(&mut self, obj: &JsObject, prop_name_si: u32, receiver: JsValue) -> Result<JsValue, String> {
let resolved = self.ordinary_get(obj, prop_name_si, receiver)?;
let mut cursor: *mut JsObject = obj as *const JsObject as *mut JsObject;
let mut depth = 0u8;
loop {
let co = unsafe { &*cursor };
if let Some(pos) = self.kernel_core.shape_forge().lookup_position(co.shape_id(), prop_name_si) {
if !co.is_accessor_meta(pos) {
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, co.shape_id(), pos, depth);
}
break;
}
if !co.proto().is_object() {
break;
}
cursor = co.proto().as_js_object_ptr();
depth += 1;
}
Ok(resolved)
}
pub(crate) fn set_member_prop(
&mut self, obj: &mut JsObject, prop_name_si: u32, val: JsValue, receiver: JsValue,
) -> Result<(), String> {
@@ -252,7 +268,7 @@ impl Vm {
return Ok(());
}
obj.set_prop_at(pos, val);
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, obj.shape_id(), pos);
crate::ic_helper::write_ic_back(&mut self.bytecode, self.pc, obj.shape_id(), pos, 0);
} else {
self.ordinary_set(obj, prop_name_si, val, receiver)?;
}