perf: typeof 改 js_type 单次提取并复用进程级静态字符串消除每次分配

crates/oxide_vm/src/dispatch/misc.rs

@@ -4,7 +4,7 @@ use oxide_bytecode::opcode;
 use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
 use oxide_types::object::{JsObject, PropAttributes};
 use oxide_types::private_key::make_int_key;
-use oxide_types::value::JsValue;
+use oxide_types::value::{JsType, JsValue};
 
 impl Vm {
     #[inline(always)]
@@ -25,31 +25,27 @@ impl Vm {
     pub(crate) fn dispatch_typeof(&mut self, rd: usize, a: usize) {
         vm_trace!("TYPEOF rd={} r{}={:?}", rd, a, self.regs[a]);
         let val = self.regs[a];
-        let result = if val.is_undefined() {
-            "undefined"
-        } else if val.is_null() {
-            "object"
-        } else if val.is_bool() {
-            "boolean"
-        } else if val.is_int() || val.is_double() {
-            "number"
-        } else if val.is_string() {
-            "string"
-        } else if val.is_symbol() {
-            "symbol"
-        } else if val.is_bigint() {
-            "bigint"
-        } else if val.is_object() {
-            let obj = unsafe { &*val.as_js_object_ptr() };
-            if obj.is_function() {
-                "function"
-            } else {
-                "object"
+        let kind = match val.js_type() {
+            JsType::Undefined => 0,
+            JsType::Null => 1,
+            JsType::Bool => 2,
+            JsType::Int | JsType::Double => 3,
+            JsType::String => 4,
+            JsType::Symbol => 5,
+            JsType::BigInt => 6,
+            JsType::Object => {
+                // 函数对象归为 "function"（语言类型是 object，typeof 有专属分支）。
+                let obj = unsafe { &*val.as_js_object_ptr() };
+                if obj.is_function() {
+                    7
+                } else {
+                    1
+                }
             }
-        } else {
-            "undefined"
         };
-        self.regs[rd] = self.new_string(result);
+        // 结果字符串复用进程级静态表（零分配、无锁、跨 VM 共享），
+        // 避免每次 typeof 新建 session 字符串。
+        self.regs[rd] = JsValue::string(oxide_kernel::string_forge::typeof_string_ptr(kind));
     }
 
     /// ToObject：rd 原地转换。对象直接返回；null/undefined 抛 TypeError；

crates/oxide_vm/tests/builtins_error_tests.rs

@@ -343,8 +343,12 @@ fn format_error_message_empty_name() {
 
 #[test]
 fn error_stack_is_string() {
-    let result = eval("typeof new Error().stack()").unwrap();
-    let vm = make_vm();
+    let allocator = oxide_parser::Allocator::default();
+    let program = oxide_parser::parse(&allocator, "typeof new Error().stack()").unwrap();
+    let module = Compiler::new().compile(&program).unwrap();
+    let mut vm = make_vm();
+    let result = vm.run(&module).unwrap();
+    // typeof 结果复用进程级静态串，同 VM 上读取（跨 VM 指针存活由实现保证，不做假设）。
     let s = vm.lookup_str(result);
     assert_eq!(s, Some("string".to_string()));
 }

crates/oxide_vm/tests/coercion_tests.rs

@@ -252,6 +252,40 @@ fn eval_signed_zero_object_is_and_array_methods() {
     assert_eq!(eval("[NaN].includes(NaN)"), "true");
 }
 
+// typeof 结果断言需要真实字符串内容，单独用 (Vm, JsValue) 形态的辅助。
+fn eval_ty(source: &str) -> Result<(Vm, JsValue), String> {
+    let allocator = oxide_parser::Allocator::default();
+    let program = oxide_parser::parse(&allocator, source).map_err(|e| format!("Parse error: {:?}", e))?;
+    let module = Compiler::new().compile(&program).map_err(|e| format!("Compile error: {}", e))?;
+    let mut vm = Vm::new();
+    let result = vm.run(&module)?;
+    Ok((vm, result))
+}
+
+// typeof：js_type 分派 + perm_string 的结果与语言类型一一对应。
+#[test]
+fn eval_typeof_all_kinds() {
+    let cases: &[(&str, &str)] = &[
+        ("typeof 1", "number"),
+        ("typeof 1.5", "number"),
+        ("typeof NaN", "number"),
+        ("typeof 's'", "string"),
+        ("typeof true", "boolean"),
+        ("typeof null", "object"),
+        ("typeof undefined", "undefined"),
+        ("typeof function(){}", "function"),
+        ("typeof Symbol('x')", "symbol"),
+        ("typeof 1n", "bigint"),
+        ("typeof {}", "object"),
+        ("typeof []", "object"),
+    ];
+    for (src, expected) in cases {
+        let (vm, result) = eval_ty(src).unwrap_or_else(|e| panic!("{src} failed: {e}"));
+        let actual = vm.lookup_str(result).unwrap_or_default();
+        assert_eq!(actual, *expected, "{src} 的 typeof 结果不符");
+    }
+}
+
 // 算术 +：对象操作数经 valueOf 强转。
 #[test]
 fn add_object_valueof_coercion() {

crates/oxide_vm/tests/function_length_tests.rs

@@ -20,9 +20,14 @@ fn run(module: &CompiledModule) -> JsValue {
 }
 
 fn eval_str(source: &str) -> String {
-    let v = eval(source);
+    let allocator = Allocator::default();
+    let program = oxide_parser::parse(&allocator, source).expect("parse failed");
+    let module = Compiler::new().compile(&program).expect("compile failed");
+    let mut vm = Vm::new();
+    let v = vm.run(&module).expect("vm run failed");
+    // 字符串结果须在同一 VM 上读：perm 串指向 VM 私有内核，VM drop 后指针悬垂。
     if v.is_string() {
-        oxide_runtime_api::to_string(v)
+        vm.lookup_str(v).unwrap_or_default()
     } else {
         format!("{v}")
     }

crates/oxide_vm/tests/property_array_fastpath_tests.rs

@@ -16,9 +16,10 @@ fn eval(source: &str) -> Result<(Vm, JsValue), String> {
 }
 
 fn eval_str(source: &str) -> Result<String, String> {
-    let (_vm, v) = eval(source)?;
+    let (vm, v) = eval(source)?;
+    // 字符串结果须在同一 VM 上读：perm 串指向 VM 私有内核，VM drop 后指针悬垂。
     if v.is_string() {
-        Ok(oxide_runtime_api::to_string(v))
+        Ok(vm.lookup_str(v).unwrap_or_default())
     } else {
         Ok(format!("{v}"))
     }

crates/oxide_vm/tests/rest_params_tests.rs

@@ -26,9 +26,14 @@ fn eval_int(source: &str) -> i32 {
 }
 
 fn eval_str(source: &str) -> String {
-    let v = eval(source);
+    let allocator = Allocator::default();
+    let program = oxide_parser::parse(&allocator, source).expect("parse failed");
+    let module = Compiler::new().compile(&program).expect("compile failed");
+    let mut vm = Vm::new();
+    let v = vm.run(&module).expect("vm run failed");
+    // 字符串结果须在同一 VM 上读：perm 串指向 VM 私有内核，VM drop 后指针悬垂。
     if v.is_string() {
-        oxide_runtime_api::to_string(v)
+        vm.lookup_str(v).unwrap_or_default()
     } else {
         format!("{v}")
     }