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perf: IC 多态化 4 槽缓存（FIFO 滚动写回）消除多态场景 miss 重解析

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每条 IC 指令扩展字 3→8（4 槽 × [shape_id|proto_depth, slot]），命中槽 0
单态快路径零额外成本，槽 1..3 懒解码遍历，miss 写回 FIFO 滚动（新条目进
槽 0、最老丢弃）。修复原型链 IC 深度解析多走一步与 prop_forge 模板不匹配
不写回两个使缓存恒失效的问题。ic_cache 基准命中率 34.8%→78.9%，
耗时 -29%；单态 prop_access 因扩展字布局膨胀有 ~20% 取指回归（后续
side-table 方案可根除）。
This commit is contained in:
彭俊皓
2026-08-15 06:40:19 +08:00
parent 96da78e817
commit b62348eb5d
9 changed files with 388 additions and 112 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/oxide_vm/src/vm_props.rs
+10 -9
View File
@@ -337,20 +337,19 @@ impl Vm {
&mut self, obj: &JsObject, prop_name_si: u32, receiver: JsValue,
) -> Result<JsValue, String> {
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];
self.pc += 3;
let (cached_shape_id, cached_slot, cached_depth) =
crate::ic_helper::read_ic_slot0(&self.bytecode, &mut self.pc);
let ic_pc = self.pc;
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 let Some(v) = crate::ic_helper::ic_get_hit(obj, cached_shape_id, cached_slot, cached_depth) {
v
} else if let Some(v) =
crate::ic_helper::ic_get_hit_poly(obj, &self.bytecode, ic_pc - oxide_bytecode::opcode::IC_EXT_WORDS)
{
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)?
@@ -366,8 +365,10 @@ impl Vm {
Ok(val)
}
/// 执行 ordinary_get 并把 IC 按原型链深度写回。
fn proto_chain_ic_get(&mut self, obj: &JsObject, prop_name_si: u32, receiver: JsValue) -> Result<JsValue, String> {
/// 执行 ordinary_get 并把 IC 按原型链深度写回（own 属性 depth=0，原型链按层计数）。
pub(crate) fn proto_chain_ic_get(
&mut self, obj: &JsObject, prop_name_si: u32, receiver: JsValue,
) -> Result<JsValue, String> {
let ic_pc = self.pc;
let resolved = self.ordinary_get(obj, prop_name_si, receiver)?;
// 快路径：自身属性（depth=0）。