feat: 增加 CreateClosure 字节码,函数字面量每次执行创建新闭包

crates/oxide_bytecode/src/opcode.rs

@@ -90,6 +90,7 @@ pub enum OpCode {
     SUPER_STATIC_GET_PROP = 0x46,
     SET_HOME_OBJECT = 0x47,
     DEFINE_ACCESSOR = 0x48,
+    CREATE_CLOSURE = 0x4A,
 
     // ── Object Property (0x50-0x5F) ──
     IC_GET_PROP = 0x50,
@@ -238,6 +239,7 @@ impl TryFrom<u8> for OpCode {
             0x46 => Ok(OpCode::SUPER_STATIC_GET_PROP),
             0x47 => Ok(OpCode::SET_HOME_OBJECT),
             0x48 => Ok(OpCode::DEFINE_ACCESSOR),
+            0x4A => Ok(OpCode::CREATE_CLOSURE),
             0x50 => Ok(OpCode::IC_GET_PROP),
             0x51 => Ok(OpCode::IC_SET_PROP),
             0x52 => Ok(OpCode::GET_PROP),
@@ -357,6 +359,7 @@ impl fmt::Display for OpCode {
             OpCode::SUPER_STATIC_GET_PROP => "SUPER_STATIC_GET_PROP",
             OpCode::SET_HOME_OBJECT => "SET_HOME_OBJECT",
             OpCode::DEFINE_ACCESSOR => "DEFINE_ACCESSOR",
+            OpCode::CREATE_CLOSURE => "CREATE_CLOSURE",
             OpCode::IC_GET_PROP => "IC_GET_PROP",
             OpCode::IC_SET_PROP => "IC_SET_PROP",
             OpCode::GET_PROP => "GET_PROP",

crates/oxide_compiler/src/compiler.rs

@@ -254,6 +254,11 @@ impl CompileCtx {
         self.emit(opcode::encode(OpCode::LOAD_CONST, reg, (idx & 0xFF) as u8, ((idx >> 8) & 0xFF) as u8));
     }
 
+    pub(crate) fn emit_create_closure(&mut self, reg: u8, sub_idx: u32) {
+        let idx = sub_idx as u16;
+        self.emit(opcode::encode(OpCode::CREATE_CLOSURE, reg, (idx & 0xFF) as u8, ((idx >> 8) & 0xFF) as u8));
+    }
+
     pub(crate) fn count_word(&mut self) {
         self.projected_pc += 1;
     }

crates/oxide_compiler/src/emitter/expr/function.rs

@@ -37,9 +37,8 @@ impl Compiler {
         // 1-indexed: 0 = no sub_module (sentinel)
         let sub_idx = ctx.sub_modules.len() as u32;
 
-        let const_idx = ctx.add_constant(Constant::BytecodeFunc(sub_idx));
         let r = ctx.alloc_reg();
-        ctx.emit_load_const(r, const_idx);
+        ctx.emit_create_closure(r, sub_idx);
         Ok(r)
     }
 
@@ -72,9 +71,8 @@ impl Compiler {
         // 1-indexed: 0 = no sub_module (sentinel)
         let sub_idx = ctx.sub_modules.len() as u32;
 
-        let const_idx = ctx.add_constant(Constant::BytecodeFunc(sub_idx));
         let r = ctx.alloc_reg();
-        ctx.emit_load_const(r, const_idx);
+        ctx.emit_create_closure(r, sub_idx);
         Ok(r)
     }
 

crates/oxide_compiler/src/emitter/mod.rs

@@ -811,8 +811,7 @@ impl Compiler {
         ctor_module.function_name = ctor_name.clone();
         ctx.sub_modules.push(ctor_module);
 
-        let ctor_idx = ctx.add_constant(Constant::BytecodeFunc(ctx.sub_modules.len() as u32));
-        ctx.emit_load_const(ctor_reg, ctor_idx);
+        ctx.emit_create_closure(ctor_reg, ctx.sub_modules.len() as u32);
         ctx.emit(opcode::encode(OpCode::NEW_OBJECT, proto_reg, 0, 0));
 
         if let Some(super_reg) = super_reg {
@@ -947,9 +946,8 @@ impl Compiler {
         method_module.needs_home_object = true;
         ctx.sub_modules.push(method_module);
 
-        let method_idx = ctx.add_constant(Constant::BytecodeFunc(ctx.sub_modules.len() as u32));
         let method_reg = ctx.alloc_reg();
-        ctx.emit_load_const(method_reg, method_idx);
+        ctx.emit_create_closure(method_reg, ctx.sub_modules.len() as u32);
         ctx.emit(opcode::encode(OpCode::SET_HOME_OBJECT, method_reg, home_reg, 0));
         Ok(method_reg)
     }

crates/oxide_compiler/src/emitter/stmt/declaration.rs

@@ -77,8 +77,7 @@ impl Compiler {
 
         let var_reg = ctx.lookup(&name)?;
         ctx.reserve_reg(var_reg);
-        let const_idx = ctx.add_constant(Constant::BytecodeFunc(sub_idx));
-        ctx.emit_load_const(var_reg, const_idx);
+        ctx.emit_create_closure(var_reg, sub_idx);
         ctx.emit(opcode::encode(OpCode::STORE_VAR, var_reg, var_reg, 0));
 
         Ok(None)

crates/oxide_vm/src/vm.rs

@@ -739,6 +739,20 @@ impl Vm {
                     self.dispatch_load_const(rd, instr)?;
                 }
 
+                OpCode::CREATE_CLOSURE => {
+                    let sub_idx = opcode::imm16(instr) as u32;
+                    debug_assert!(sub_idx > 0 && (sub_idx as usize) <= self.sub_modules.len());
+                    let sub = &self.sub_modules[sub_idx as usize - 1];
+                    let result = self.create_function_object(
+                        sub_idx,
+                        sub.is_arrow,
+                        sub.is_class_constructor,
+                        sub.is_derived_constructor,
+                        sub.needs_home_object,
+                    );
+                    self.regs[rd] = result;
+                }
+
                 OpCode::ADD => {
                     self.dispatch_add(rd, a, b)?;
                 }

crates/oxide_vm/src/vm_runtime.rs

@@ -158,8 +158,7 @@ impl Vm {
             }
         }
 
-        let global_ptr = self.session.global_object().as_ptr() as *mut JsObject;
-        self.regs[254] = JsValue::from_js_object(global_ptr);
+        self.regs[254] = JsValue::undefined();
 
         self.dispatch()
     }

crates/oxide_vm/src/vm_support.rs

@@ -235,7 +235,7 @@ impl Vm {
     /// Create a function JsObject for a BytecodeFunc constant.
     /// When `is_arrow` is true, captures the current `this` (regs[254])
     /// for lexical this binding at call time.
-    fn create_function_object(
+    pub(crate) fn create_function_object(
         &mut self, sub_idx: u32, is_arrow: bool, is_class_constructor: bool, is_derived_constructor: bool,
         needs_home_object: bool,
     ) -> JsValue {