feat: 支持对象进行完整 ES 属性解析

crates/oxide_vm/src/coercion.rs

@@ -1,3 +1,5 @@
+use crate::object::JsObject;
+use crate::shape::EMPTY_SHAPE_ID;
 use crate::value::JsValue;
 use crate::vm::Vm;
 
@@ -184,6 +186,25 @@ pub fn string_concat(lhs: &str, rhs: &str) -> String {
     s
 }
 
-fn panic_to_object() {
-    panic!("ToObject not yet implemented (Phase 6)")
+fn panic_to_object() -> ! {
+    panic!("ToObject failed: null or undefined cannot be converted to object")
+}
+
+pub fn to_object(val: JsValue, vm: &mut Vm) -> Result<JsValue, &'static str> {
+    if val.is_object() {
+        return Ok(val);
+    }
+    if val.is_null() || val.is_undefined() {
+        return Err("TypeError: Cannot convert null or undefined to object");
+    }
+    let proto_ptr = &*vm.object_prototype as *const JsObject as *mut JsObject;
+    let proto_val = JsValue::from_js_object(proto_ptr);
+    let obj = vm
+        .epoch
+        .alloc(JsObject::new_empty(EMPTY_SHAPE_ID, proto_val));
+    let obj_val = JsValue::from_js_object(obj);
+    let obj_ref = unsafe { &mut *obj };
+    obj_ref.set_inline_prop(0, val);
+    obj_ref.set_prop_count(1);
+    Ok(obj_val)
 }

crates/oxide_vm/src/object.rs

@@ -142,9 +142,28 @@ impl JsObject {
         self.proto
     }
 
-    pub fn set_proto(&mut self, proto: JsValue) {
+    pub fn set_proto(&mut self, proto: JsValue) -> Result<(), &'static str> {
+        if proto.is_null() {
             self.proto = proto;
             self.generation = self.generation.wrapping_add(1);
+            return Ok(());
+        }
+        if !proto.is_object() {
+            return Err("__proto__ must be an object or null");
+        }
+        let mut cursor = proto;
+        let self_ptr = self as *const JsObject;
+        while cursor.is_object() {
+            let cursor_ptr = cursor.as_js_object_ptr();
+            if cursor_ptr == self_ptr as *mut JsObject {
+                return Err("cyclic __proto__ value");
+            }
+            let obj = unsafe { &*cursor_ptr };
+            cursor = obj.proto;
+        }
+        self.proto = proto;
+        self.generation = self.generation.wrapping_add(1);
+        Ok(())
     }
 
     pub fn generation(&self) -> u32 {

crates/oxide_vm/src/vm.rs

@@ -61,6 +61,21 @@ impl Vm {
         self.string_reverse.get(idx).map(|s| s.as_str())
     }
 
+    fn resolve_property(&self, obj: &JsObject, prop_name_si: u32) -> Option<JsValue> {
+        if let Some(offset) = shape::lookup_offset(obj.shape_id(), prop_name_si) {
+            return Some(obj.get_prop(offset));
+        }
+        let mut proto = obj.proto();
+        while proto.is_object() {
+            let proto_obj = unsafe { &*proto.as_js_object_ptr() };
+            if let Some(offset) = shape::lookup_offset(proto_obj.shape_id(), prop_name_si) {
+                return Some(proto_obj.get_prop(offset));
+            }
+            proto = proto_obj.proto();
+        }
+        None
+    }
+
     pub fn run(&mut self, module: &CompiledModule) -> Result<JsValue, String> {
         self.string_table.clear();
         self.string_reverse.clear();
@@ -265,16 +280,16 @@ impl Vm {
 
                     if cached_shape_id != 0 && cached_shape_id == obj.shape_id() {
                         self.regs[a] = obj.get_prop(cached_offset);
-                    } else {
-                        if let Some(offset) = shape::lookup_offset(obj.shape_id(), prop_name_si) {
+                    } else if let Some(val) = self.resolve_property(obj, prop_name_si) {
+                        let offset =
+                            shape::lookup_offset(obj.shape_id(), prop_name_si).unwrap_or(0);
                         let new_ext = (obj.shape_id() & 0x00FF_FFFF) | ((offset as u32) << 24);
                         self.bytecode[self.pc - 1] = new_ext;
-                            self.regs[a] = obj.get_prop(offset);
+                        self.regs[a] = val;
                     } else {
                         self.regs[a] = JsValue::undefined();
                     }
                 }
-                }
 
                 OpCode::IC_SET_PROP => {
                     let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
@@ -316,13 +331,10 @@ impl Vm {
                     }
                     let obj = unsafe { &*obj_ptr };
                     let prop_name_si = self.regs[b].as_string_index();
-                    if let Some(offset) = shape::lookup_offset(obj.shape_id(), prop_name_si) {
-                        self.regs[a] = obj.get_prop(offset);
-                    } else {
-                        self.regs[a] = JsValue::undefined();
+                    self.regs[a] = self
+                        .resolve_property(obj, prop_name_si)
+                        .unwrap_or(JsValue::undefined());
                 }
-                }
-
                 OpCode::SET_PROP => {
                     let obj_ptr = self.regs[rd].as_object_ptr() as *mut JsObject;
                     if obj_ptr.is_null() {
@@ -353,11 +365,9 @@ impl Vm {
                         return Err("GET_PROP_DYNAMIC key not a string".into());
                     }
                     let prop_name_si = key_val.as_string_index();
-                    if let Some(offset) = shape::lookup_offset(obj.shape_id(), prop_name_si) {
-                        self.regs[b] = obj.get_prop(offset);
-                    } else {
-                        self.regs[b] = JsValue::undefined();
-                    }
+                    self.regs[b] = self
+                        .resolve_property(obj, prop_name_si)
+                        .unwrap_or(JsValue::undefined());
                 }
 
                 OpCode::SET_PROP_DYNAMIC => {