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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 461b18fa05
commit 54b6955f6b
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/dispatch/property.rs
+30 -26
View File
@@ -1,5 +1,5 @@
use crate::{ic_debug, ic_trace, vm_trace};
use oxide_bytecode::opcode::OpCode;
use oxide_bytecode::opcode::{OpCode, IC_EXT_WORDS};
use oxide_kernel::prop_forge::PropTemplate;
use oxide_runtime_api as coercion;
use oxide_types::object::JsObject;
@@ -296,7 +296,7 @@ impl Vm {
let prop_name_si = self.property_key_si(self.regs[b])?;
if let Some(resolved) = self.primitive_property_get(val, prop_name_si)? {
self.regs[a] = resolved;
self.pc += 3;
self.pc += IC_EXT_WORDS;
return Ok(());
}
self.raise_type_error("IC_GET_PROP on non-object")?;
@@ -309,7 +309,7 @@ impl Vm {
}
let obj = unsafe { &*obj_ptr };
let (cached_shape_id, cached_slot, cached_depth) = ic_helper::read_ic_entry(&self.bytecode, &mut self.pc);
let (cached_shape_id, cached_slot, cached_depth) = ic_helper::read_ic_slot0(&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。
@@ -322,36 +322,38 @@ 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。
// 槽 0 单态命中：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(value) = ic_helper::ic_get_hit_poly(obj, &self.bytecode, ic_pc - IC_EXT_WORDS) {
// 多态槽（1..3）命中。
self.regs[a] = value;
self.profiling.record_ic_hit();
ic_trace!("IC_GET poly hit pc={} shape={}", ic_pc, obj.shape_id());
} 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])?;
self.profiling.record_ic_miss();
prop_cache_miss();
// 模板快路径：prop_forge 只缓存每 shape 最后新增的属性，恰好覆盖该属性时直取槽位。
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)?;
}
if template.prop_name == prop_name_si && 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 {
// 模板不覆盖该属性（读非末位属性）：走通用 miss 路径并写回，
// 否则该 shape 的缓存条目永远学不到。
ic_debug!("IC_GET miss shape={} prop={}", obj.shape_id(), prop_name_si);
self.regs[a] = self.ordinary_get(obj, prop_name_si, val)?;
self.regs[a] = self.proto_chain_ic_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）。
@@ -399,15 +401,18 @@ impl Vm {
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);
// read_ic_slot0 先消费全部扩展字，命中路径无需解析键。
let (cached_shape_id, cached_slot, cached_depth) = ic_helper::read_ic_slot0(&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) {
if !obj.has_prop_meta()
&& (ic_set_hit(obj, cached_shape_id, cached_slot, cached_depth, value)
|| ic_helper::ic_set_hit_poly(obj, &self.bytecode, ic_pc - IC_EXT_WORDS, value))
{
self.profiling.record_ic_hit();
ic_trace!("IC_SET hit shape={} slot={} depth={}", cached_shape_id, cached_slot, cached_depth);
return Ok(());
@@ -438,7 +443,6 @@ impl Vm {
ic_debug!("IC_SET write-back shape={} slot={}", obj.shape_id(), pos);
} else {
self.profiling.record_ic_miss();
prop_cache_miss();
let old_shape = obj.shape_id();
self.ordinary_set_dispatch(obj, prop_name_si, value, receiver)?;
if old_shape != obj.shape_id() {