refactor: Vm 状态分组、dispatch 拆分为分发表、IC 辅助函数独立成模块

crates/oxide_vm/src/dispatch/misc.rs

@@ -1,4 +1,8 @@
 use crate::vm::Vm;
+use oxide_bytecode::opcode;
+use oxide_kernel::shape_forge::EMPTY_SHAPE_ID;
+use oxide_types::object::JsObject;
+use oxide_types::value::JsValue;
 
 impl Vm {
     #[inline(always)]
@@ -40,4 +44,51 @@ impl Vm {
         };
         self.regs[rd] = self.new_string(result);
     }
+
+    pub(crate) fn dispatch_load_var(&mut self, rd: usize, a: usize) -> Result<bool, String> {
+        if a == 254
+            && self.frames.last().map(|frame| frame.is_derived_constructor).unwrap_or(false)
+            && self.regs[a].is_undefined()
+        {
+            self.raise_error_kind("ReferenceError", "must call super constructor before using 'this'")?;
+            return Ok(true);
+        }
+        self.regs[rd] = self.regs[a];
+        Ok(false)
+    }
+
+    pub(crate) fn dispatch_store_var(&mut self, rd: usize, a: usize, b: usize) -> Result<bool, String> {
+        if b != 0 {
+            // const guard: check if already initialized
+            if !self.regs[rd].is_undefined() {
+                self.raise_error_kind("TypeError", "Assignment to constant variable")?;
+                return Ok(true);
+            }
+        }
+        self.regs[rd] = self.regs[a];
+        Ok(false)
+    }
+
+    #[inline(always)]
+    pub(crate) fn dispatch_new_object(&mut self, rd: usize) {
+        let proto_ptr = &*self.object_prototype as *const JsObject as *mut JsObject;
+        let obj = self
+            .epoch
+            .alloc(JsObject::new_empty(EMPTY_SHAPE_ID, JsValue::from_js_object(proto_ptr)));
+        self.regs[rd] = JsValue::object(obj as *mut u8);
+    }
+
+    #[inline(always)]
+    pub(crate) fn dispatch_new_array(&mut self, rd: usize, instr: u32) {
+        let proto_ptr = self.session.builtin_world().array_proto.as_ptr() as *mut JsObject;
+        let n = opcode::imm16(instr) as usize;
+        let bump = self.epoch.bump();
+        let obj = self.alloc_object(JsObject::new_array(EMPTY_SHAPE_ID, JsValue::from_js_object(proto_ptr), n, bump));
+        self.regs[rd] = JsValue::object(obj as *mut u8);
+    }
+
+    #[inline(always)]
+    pub(crate) fn dispatch_void(&mut self, rd: usize) {
+        self.regs[rd] = JsValue::undefined();
+    }
 }