mirror of
https://github.com/pjh456/OxideJS.git
synced 2026-10-23 18:21:13 +08:00
1215 lines
58 KiB
Rust
1215 lines
58 KiB
Rust
use crate::native::NativeFn;
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use crate::vm::{native_fn_ptr_to_fn, FrameArgs, FrameContinuation, Vm};
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use crate::{vm_debug, vm_trace};
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use oxide_builtins::iterator::make_iterator_for_value;
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use oxide_builtins::{builtins_debug, builtins_trace};
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use oxide_bytecode::opcode;
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use oxide_runtime_api::{to_boolean, NativeResult};
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use oxide_types::object::{Cell, JsObject, PropAttributes};
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use oxide_types::value::JsValue;
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impl Vm {
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/// 把连续实参寄存器段与 this 寄存器打包成 native 调用下标表。
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///
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/// 返回 `([u8; 257], len)`：`buf[0]` 为 this 寄存器下标，其后依次为 `first_arg_reg`
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/// 起连续递增的实参寄存器下标。数组由调用方在栈上持有，供 native 函数按下标直读
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/// 共享寄存器窗口。
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///
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/// # 边界与前提
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/// - `arg_count` 截断为 256，超出部分不进入下标表（`len ≤ 257`）。
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/// - 实参寄存器下标按 `u8` 回绕，调用方须保证窗口内连续可用。
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#[inline(always)]
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pub(crate) fn build_native_args(first_arg_reg: u8, arg_count: usize, this_reg: u8) -> ([u8; 257], usize) {
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let mut args_buf = [0u8; 257];
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args_buf[0] = this_reg;
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let n = arg_count.min(256);
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for i in 0..n {
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args_buf[i + 1] = first_arg_reg.wrapping_add(i as u8);
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}
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(args_buf, n + 1)
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}
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/// native 函数调用收口：校验调用深度、打包实参、快照 callee 槽后执行实现并按三态回写结果。
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///
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/// native 与调用方共享扁平寄存器文件，故实现执行前把当前 callee 放进 `regs[254]`
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/// 供分发型 builtin（bind/call/apply）读取「当前 callee」，执行后恢复调用方 `this`。
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///
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/// # 步骤
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/// 1. 调用深度达上限抛 RangeError。
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/// 2. `build_native_args` 打包实参下标表。
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/// 3. 经 `native_fn_ptr_to_fn` 取得函数项并执行；执行前后快照/恢复 `regs[254]`。
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/// 4. 按 `NativeResult` 三态回写：`Ok` 写 `regs[0]`；`Err` 以原始值走 `unwind`；
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/// `TailCall` 目标为 native 时同步调用，否则压字节码帧。
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///
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/// # 边界与前提
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/// - 调用方须保证 `obj` 已是 native 函数：`native_fn()` 为空时此处 unwrap 失败。
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/// - `Err` 保留异常原值：用户回调 throw 的原始值经 catch 原样收到，不包装成 Error。
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///
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/// # 副作用
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/// - 修改 `native_call_depth`、`regs[0]`、`regs[254]`，普通调用形态清零
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/// `constructing_native`，可能压帧或触发异常展开。
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///
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/// # 注意事项
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/// - `native_fn_ptr_to_fn` 是 NativeFnPtr → NativeFn 的唯一强制转换点，SAFETY 前提
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/// 为 `native_fn` 由 `set_native_fn` 以合法函数项指针设置。
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#[inline(always)]
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pub(crate) fn dispatch_native_call(
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&mut self, obj: &JsObject, callee: JsValue, this_reg: u8, first_arg_reg: u8, arg_count: usize,
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) -> Result<(), String> {
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if self.native_call_depth >= self.kernel_core.config.max_call_depth {
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return self.raise_error_kind("RangeError", "Maximum call stack size exceeded");
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}
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let (args_buf, len) = Self::build_native_args(first_arg_reg, arg_count, this_reg);
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let args_slice = &args_buf[..len];
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builtins_debug!("native_call depth={} args={}", self.native_call_depth, arg_count);
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// SAFETY: native_fn 经 set_native_fn 以合法 NativeFn 指针设置；
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// native_fn_ptr_to_fn 是 NativeFnPtr → NativeFn 的唯一强制转换点。
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let func: NativeFn = unsafe { native_fn_ptr_to_fn(obj.native_fn().unwrap()) };
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// regs[254] 是调用方的 `this` 寄存器，同时充当分发型 builtin
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// （Function.prototype.bind/call/apply）读取的"当前 callee"槽。native 调用与
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// 调用方共享扁平寄存器文件，因此先快照调用方 `this`，在 native 执行期间暴露
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// callee，随后恢复——否则每次 native 调用都会把自己的函数对象留在调用方的
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// `this` 寄存器里。
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let saved_this = self.regs[254];
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self.regs[254] = callee;
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// 普通调用形态：清零构造形态标记，防止外层构造窗口残留误判
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// （成员式普通调用落在构造器帧内时 new.target 槽仍为类构造器）。
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self.constructing_native = false;
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self.native_call_depth += 1;
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let result = func(self, args_slice);
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self.native_call_depth -= 1;
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self.regs[254] = saved_this;
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match result {
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NativeResult::Ok(val) => {
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builtins_trace!("native_call ok depth={}", self.native_call_depth);
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self.regs[0] = val;
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Ok(())
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}
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NativeResult::Err(err_val) => {
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// 异常值原样保留：native 内部错误均为 Error 对象（走上方分支），
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// 非对象值来自用户回调 throw 的原始异常（经 last_uncaught_value
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// 恢复），按 ECMAScript 语义 catch 须收到原值，不得包装成 Error。
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let kind = self.thrown_error_kind(err_val);
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self.exception_value = Some(err_val);
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self.pending_error_kind = Some(kind);
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self.unwind()
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}
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NativeResult::TailCall { callee, this, args } => {
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if callee.is_object() {
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let obj = unsafe { &*callee.as_js_object_ptr() };
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// 不可调用目标（apply/call/bound 转发的 thisArg 不可调用等）抛
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// 可捕获 TypeError；落入 push_bytecode_frame 会产生引擎级错误，
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// 绕过 JS try/catch。
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if !obj.is_function() || (obj.native_fn().is_none() && obj.sub_module_index() == 0) {
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return self.raise_type_error("CALL target is not callable");
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}
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if obj.native_fn().is_some() {
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// 尾调用转发为普通调用形态。
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self.constructing_native = false;
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match self.call_function_sync(callee, this, &args) {
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Ok(val) => {
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self.regs[0] = val;
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return Ok(());
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}
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Err(e) => {
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// call_function_sync 已把 native 错误展平为 String，
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// 原始 JsValue 暂存在 last_uncaught_value——恢复为 JS 异常，
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// 使外围 try/catch 能捕获（而非作为引擎错误上抛）；
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// 无原值时从展平文本恢复 kind，泛型回退会把种类
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// 降级为普通 Error。
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let exc = self
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.last_uncaught_value
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.take()
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.unwrap_or_else(|| oxide_builtins::error::create_from_text(self, &e));
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let kind = self.thrown_error_kind(exc);
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self.exception_value = Some(exc);
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self.pending_error_kind = Some(kind);
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self.unwind()?;
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return Ok(());
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}
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}
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}
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} else {
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return self.raise_type_error("CALL target is not callable");
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}
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self.push_bytecode_frame(
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callee,
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this,
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FrameArgs::Slice(&args),
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None,
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None,
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JsValue::undefined(),
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FrameContinuation::None,
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0,
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)
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}
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}
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}
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}
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impl Vm {
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pub(crate) fn dispatch_create_closure(&mut self, rd: usize, instr: u32) -> Result<(), String> {
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let sub_idx = opcode::imm16(instr) as u32;
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vm_trace!("CREATE_CLOSURE rd={} sub_idx={}", rd, sub_idx);
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// 指令操作数是发射期 flat_id，口径为执行帧字节码所属代际的平表：跨 run
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// 调用在当前代际上下文执行旧代字节码，须按执行帧的表代际解析，按当前
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// 代际会悬空（表更短）或命中他代异模块（表足够长）。
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let table = self.active_table();
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if sub_idx == 0 || (sub_idx as usize) >= table.modules.len() {
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// sub_idx 超出执行帧代际平表：定义模块缺失或发射期编号错位——按
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// 运行时错误处理而非索引越界 panic。
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return Err(format!(
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"CREATE_CLOSURE: sub_module_index {} out of bounds (max {})",
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sub_idx,
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table.modules.len()
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));
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}
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let sub = &table.modules[sub_idx as usize];
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let is_arrow = sub.is_arrow;
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let is_class_constructor = sub.is_class_constructor;
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let is_derived_constructor = sub.is_derived_constructor;
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let needs_home_object = sub.needs_home_object;
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let upvalue_captures = sub.upvalue_captures.clone();
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let function_name = sub.function_name.clone();
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let function_length = sub.function_length;
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// 新闭包盖执行帧代际：sub_idx 与 gen 同域，跨 run 调用时新闭包仍解析
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// 回定义模块所在的原表。
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let result = self.create_function_object(
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sub_idx,
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self.active_table_gen,
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is_arrow,
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is_class_constructor,
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is_derived_constructor,
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needs_home_object,
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);
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// 函数名推断：emit 端在变量声明/对象属性赋值点设置 function_name。
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let func_obj = unsafe { &mut *result.as_js_object_ptr() };
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let length_si = self.length_si;
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let name_si = self.kernel_core.perm_interner().intern("name").0;
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// length/name 描述符均为不可写、不可枚举、可配置（SetFunctionLength /
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// SetFunctionName 语义）；length 先于 name 定义保证属性序 [prototype, length, name]。
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let attrs = PropAttributes::new(false, false, true);
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let length_val = JsValue::int(function_length as i32);
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self.define_data_property(func_obj, length_si, length_val, attrs)?;
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let name_val = function_name
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.as_deref()
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.map(|n| self.new_string(n))
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.unwrap_or_else(|| self.new_string(""));
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self.define_data_property(func_obj, name_si, name_val, attrs)?;
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if !upvalue_captures.is_empty() {
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// 链式捕获（parent_uv_idx）：从父闭包（创建者）的 upvalues 取 cell。
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let parent_upvalues: Vec<*mut Cell> = match self.current_callee() {
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Some(callee) if callee.is_object() => unsafe { &*callee.as_js_object_ptr() }.upvalues_slice().to_vec(),
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_ => Vec::new(),
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};
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if let Some(current_cells) = self.cell_stack.last_mut() {
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let mut upvals = Box::new(Vec::with_capacity(upvalue_captures.len()));
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for capture in &upvalue_captures {
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let cell_ptr = if let Some(puv) = capture.parent_uv_idx {
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match parent_upvalues.get(puv as usize) {
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Some(&ptr) => ptr,
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// parent_uv_idx 由编译期按父 upvalue 表位置计算，越界即
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// 捕获编码错位——Err 早暴露，避免落惰性路径读到错层 cell。
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None => {
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return Err(format!(
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"CREATE_CLOSURE: parent upvalue index {} out of bounds (parent has {})",
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puv,
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parent_upvalues.len()
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));
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}
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}
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} else {
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let cell_idx = capture.cell_idx as usize;
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if cell_idx >= current_cells.len() {
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current_cells.resize(cell_idx + 1, std::ptr::null_mut());
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}
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// cell 可能尚未 MAKE_CELL（hoisting 顺序：CREATE_CLOSURE 先于
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// MAKE_CELL）——建占位 Cell，后续 MAKE_CELL 更新同一 Cell 的值，
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// 保证 upvalue 始终指向定义方表里的稳定 cell（而非调用方表）。
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if current_cells[cell_idx].is_null() {
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// 占位 Cell 保持未初始化（TDZ）直到 MAKE_CELL 置位；
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// 若绑定为 var 则其初始化 MAKE_CELL 在函数序言先于任何读取执行。
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current_cells[cell_idx] = self.realm.gc.borrow().alloc_cell(JsValue::undefined(), false);
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}
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current_cells[cell_idx]
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};
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upvals.push(cell_ptr);
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}
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let func_obj = unsafe { &mut *result.as_js_object_ptr() };
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func_obj.set_upvalues(upvals);
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}
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}
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self.regs[rd] = result;
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Ok(())
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}
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/// 初始化（或复用）当前帧调用环境的 cell：按 a 槽下标写入 `cell_stack`，b 槽决定初始化标志。
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///
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/// # 步骤
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/// 1. 取 a 槽为 cell 下标，按需扩容 `cell_stack` 至可容纳该下标。
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/// 2. b 槽为 0 表示已初始化，非 0 为 TDZ（读写抛 ReferenceError，用于 for-in/for-of
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/// 词法头环境建模）。
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/// 3. 槽位为空时新建 cell；TDZ 占位遇已初始化 cell 恒新建替换（循环体每迭代
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/// 重执行不得把上一迭代已被闭包捕获的 cell 原位翻回未初始化）；其余情形
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/// 原位更新值与标志，使闭包 upvalue 指向的同一 cell 跟随初始化。
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///
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/// # 边界与前提
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/// - `cell_stack` 为空时 `last_mut()` unwrap 失败；调用前须已压入当前帧环境层。
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///
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/// # 副作用
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/// - 写入/更新/替换堆上 `Cell`（可能触发分配），改动闭包 upvalue 可见值。
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///
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/// # 注意事项
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/// - 手写 IR 路径保留的指令，常规编译不发射，故标 `#[allow(dead_code)]`。
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#[allow(dead_code)]
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pub(crate) fn dispatch_make_cell(&mut self, rd: usize, instr: u32) -> Result<(), String> {
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// a 槽为 cell 索引；b 槽承载未初始化标志（1 = 绑定永不被初始化，
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// 读写抛 ReferenceError，for-in/for-of 词法头 TDZ 环境建模用）。
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let cell_idx = opcode::a(instr) as usize;
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let initialized = opcode::b(instr) == 0;
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let value = self.regs[rd];
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let current = self.cell_stack.last_mut().unwrap();
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while current.len() <= cell_idx {
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current.push(std::ptr::null_mut());
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}
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if current[cell_idx].is_null() {
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// 无占位 cell：新建。
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current[cell_idx] = self.realm.gc.borrow().alloc_cell(value, initialized);
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} else {
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let existing_initialized = unsafe { &*current[cell_idx] }.is_initialized();
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if !initialized && existing_initialized {
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// TDZ 占位而槽内是已初始化 cell：新建替换。循环体每迭代重执行
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// 的 TDZ 占位不得原位翻新迭代 cell（已被本迭代前闭包捕获）；
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// 已初始化 cell 保持身份，闭包 upvalue 保值。
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current[cell_idx] = self.realm.gc.borrow().alloc_cell(value, initialized);
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} else {
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// 更新占位 cell（CREATE_CLOSURE 已建），使闭包 upvalue 指向的
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// cell 值跟随初始化；初始化标志随指令 b 槽。
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unsafe {
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let cell = &mut *current[cell_idx];
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cell.value = value;
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cell.set_initialized(initialized);
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}
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}
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}
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Ok(())
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}
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/// 无条件新建 cell 并替换 cell_stack[cell_idx]，值为 `regs[rd]`。
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///
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/// 循环每迭代绑定用：把当前迭代值拷入新 cell，本迭代创建的闭包经
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/// CREATE_CLOSURE 捕获新 cell（旧闭包仍指向旧 cell，值保持）。与
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/// `dispatch_make_cell` 的唯一区别是恒新建、不复用占位 cell。
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#[allow(dead_code)]
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pub(crate) fn dispatch_make_cell_fresh(&mut self, rd: usize, instr: u32) -> Result<(), String> {
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let cell_idx = opcode::imm16(instr) as usize;
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let value = self.regs[rd];
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let current = self.cell_stack.last_mut().unwrap();
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while current.len() <= cell_idx {
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current.push(std::ptr::null_mut());
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}
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current[cell_idx] = self.realm.gc.borrow().alloc_cell(value, true);
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Ok(())
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}
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/// 读取当前帧 cell：空槽惰性建 cell，未初始化（TDZ）抛 ReferenceError，否则写 `regs[rd]`。
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///
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/// # 步骤
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/// 1. 取 b 槽为 cell 下标，按需扩容 `cell_stack`。
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/// 2. 槽位为空时以 `regs[a]` 为初值新建已初始化 cell（`CREATE_CLOSURE` 占位缺失路径）。
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/// 3. cell 未初始化抛 ReferenceError；否则值写入 `regs[rd]`。
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///
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/// # 边界与前提
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/// - cell 下标越界按需扩容，不报错。
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///
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/// # 注意事项
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/// - 手写 IR 保留指令（同 `dispatch_make_cell`）。
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#[allow(dead_code)]
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pub(crate) fn dispatch_cell_get(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
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let cell_idx = b;
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let current = self.cell_stack.last_mut().unwrap();
|
||
while current.len() <= cell_idx {
|
||
current.push(std::ptr::null_mut());
|
||
}
|
||
if current[cell_idx].is_null() {
|
||
let val = self.regs[a];
|
||
current[cell_idx] = self.realm.gc.borrow().alloc_cell(val, true);
|
||
}
|
||
let c = unsafe { &*current[cell_idx] };
|
||
if !c.is_initialized() {
|
||
return self.raise_error_kind("ReferenceError", &Self::tdz_message(self.tdz_binding_name(cell_idx, false)));
|
||
}
|
||
self.regs[rd] = c.value;
|
||
Ok(())
|
||
}
|
||
|
||
/// 写入当前帧 cell：越界或空槽静默 no-op，TDZ 写检查后写值并置已初始化。
|
||
///
|
||
/// # 步骤
|
||
/// 1. b 槽为 cell 下标；下标越界直接返回（不建槽）。
|
||
/// 2. 槽位为空（尚无 `CREATE_CLOSURE`/`MAKE_CELL`）静默返回，不改状态。
|
||
/// 3. cell 未初始化（声明点前）抛 ReferenceError。
|
||
/// 4. 写入 `regs[a]` 并置 initialized。
|
||
///
|
||
/// # 边界与前提
|
||
/// - 空槽/越界均为 no-op，与读路径的惰性建 cell 不对称：写方无可用源值建槽。
|
||
///
|
||
/// # 副作用
|
||
/// - 修改堆上 `Cell` 值与初始化标志。
|
||
///
|
||
/// # 注意事项
|
||
/// - 手写 IR 保留指令（同 `dispatch_make_cell`）。
|
||
#[allow(dead_code)]
|
||
pub(crate) fn dispatch_cell_set(&mut self, a: usize, b: usize) -> Result<(), String> {
|
||
let cell_idx = b;
|
||
let src_val = self.regs[a];
|
||
let current = self.cell_stack.last_mut().unwrap();
|
||
if cell_idx >= current.len() {
|
||
return Ok(());
|
||
}
|
||
let cell_ptr = current[cell_idx];
|
||
if cell_ptr.is_null() {
|
||
return Ok(());
|
||
}
|
||
unsafe {
|
||
let cell = &mut *cell_ptr;
|
||
// TDZ 写检查：cell 未初始化（捕获绑定声明点前）写抛 ReferenceError。
|
||
if !cell.is_initialized() {
|
||
return self
|
||
.raise_error_kind("ReferenceError", &Self::tdz_message(self.tdz_binding_name(cell_idx, false)));
|
||
}
|
||
cell.value = src_val;
|
||
cell.set_initialized(true);
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// 当前执行函数的闭包对象：普通路径取 frames 栈顶帧，inline（sync 回调）路径
|
||
/// frames 被隔离为空，取 `inline_callee`。
|
||
pub(crate) fn current_callee(&self) -> Option<JsValue> {
|
||
self.frames.last().map(|f| f.callee).or(self.inline_callee)
|
||
}
|
||
|
||
/// TDZ 消息的绑定名：解析当前函数对象的编译模块，按站点类型取名
|
||
/// （upvalue 站点查 upvalue_captures，own cell 站点查 cell_names）。
|
||
///
|
||
/// # 边界
|
||
/// - 无当前函数对象（顶层脚本直读）、非对象 callee、模块解析缺失或下标
|
||
/// 越界时返回 None，调用方回退通用文本。
|
||
fn tdz_binding_name(&self, idx: usize, is_upvalue: bool) -> Option<&str> {
|
||
let callee = self.current_callee()?;
|
||
if !callee.is_object() {
|
||
return None;
|
||
}
|
||
// callee 是 GC 根，对象在取名期间稳定。
|
||
let obj = unsafe { &*callee.as_js_object_ptr() };
|
||
let module = self.callee_module(obj)?;
|
||
if is_upvalue {
|
||
module.upvalue_captures.get(idx).map(|c| c.name.as_str())
|
||
} else {
|
||
module.cell_names.get(idx).filter(|n| !n.is_empty()).map(|n| n.as_str())
|
||
}
|
||
}
|
||
|
||
/// TDZ 消息：取到绑定名时用 `Cannot access 'x' before initialization` 形态，
|
||
/// 取不到时回退通用文本。
|
||
fn tdz_message(name: Option<&str>) -> String {
|
||
match name {
|
||
Some(n) => format!("Cannot access '{n}' before initialization"),
|
||
None => String::from("Cannot access variable before initialization"),
|
||
}
|
||
}
|
||
|
||
/// 读取当前闭包的 upvalue：命中 cell 判初始化后取值，未命中委托惰性建 cell。
|
||
///
|
||
/// # 步骤
|
||
/// 1. 取 imm16 为 upvalue 下标；直接索引活动镜像表（当前执行函数的表，
|
||
/// 非闭包为 null 空切片）。
|
||
/// 2. 命中且非空：未初始化（TDZ）抛 ReferenceError，否则值写入 `regs[rd]`。
|
||
/// 3. 未命中/空槽（`CREATE_CLOSURE` 早于 `MAKE_CELL`）：委托
|
||
/// `lazy_create_upvalue_cell` 建 cell。
|
||
///
|
||
/// # 边界与前提
|
||
/// - `uv_idx` 越界或当前无 callee 时同样走惰性路径，最终回退 undefined。
|
||
/// - 镜像指针跨 GC 恒有效：callee 对象是 GC 根，`upvalues` Box
|
||
/// 创建后不替换。
|
||
pub(crate) fn dispatch_load_upvalue(&mut self, rd: usize, instr: u32) -> Result<(), String> {
|
||
let uv_idx = opcode::imm16(instr) as usize;
|
||
// 活动镜像是当前执行函数的表（压帧/内联/弹帧/挂起恢复边界置位）：
|
||
// 直接解引用安全（callee 是 GC 根、Box 创建后不替换）。
|
||
let upvals = unsafe { &*self.active_upvalues };
|
||
if uv_idx < upvals.len() {
|
||
let cell = upvals[uv_idx];
|
||
if !cell.is_null() {
|
||
let c = unsafe { &*cell };
|
||
if !c.is_initialized() {
|
||
return self
|
||
.raise_error_kind("ReferenceError", &Self::tdz_message(self.tdz_binding_name(uv_idx, true)));
|
||
}
|
||
self.regs[rd] = c.value;
|
||
return Ok(());
|
||
}
|
||
}
|
||
// cell 尚未创建（hoisting 顺序：CREATE_CLOSURE 先于 MAKE_CELL），
|
||
// 用调用方寄存器值惰性创建 cell。
|
||
self.lazy_create_upvalue_cell(rd, uv_idx)
|
||
}
|
||
|
||
/// 为当前闭包惰性创建 upvalue cell：初值优先取调用方 cell 表（`cell_stack` 倒数
|
||
/// 第二层）同下标 cell 的值，缺失时取 `regs[rd]`。
|
||
///
|
||
/// 服务于 `CREATE_CLOSURE` 早于 `MAKE_CELL` 的 hoisting 顺序。cell 建好后写回闭包
|
||
/// `upvalues[uv_idx]` 并把值读回 `regs[rd]`；无 callee 或下标越界时 `regs[rd]` 置 undefined。
|
||
fn lazy_create_upvalue_cell(&mut self, rd: usize, uv_idx: usize) -> Result<(), String> {
|
||
if let Some(callee) = self.current_callee() {
|
||
if callee.is_object() {
|
||
let obj = unsafe { &mut *callee.as_js_object_ptr() };
|
||
let upvals = obj.upvalues_slice_mut();
|
||
if uv_idx < upvals.len() {
|
||
// 尝试从调用方 cell 表取初值（MAKE_CELL 在 CREATE_CLOSURE 之后执行）。
|
||
let val = if self.cell_stack.len() >= 2 {
|
||
let caller_cells = &self.cell_stack[self.cell_stack.len() - 2];
|
||
if uv_idx < caller_cells.len() && !caller_cells[uv_idx].is_null() {
|
||
unsafe { (*caller_cells[uv_idx]).value }
|
||
} else {
|
||
self.regs[rd]
|
||
}
|
||
} else {
|
||
self.regs[rd]
|
||
};
|
||
upvals[uv_idx] = self.realm.gc.borrow().alloc_cell(val, true);
|
||
self.regs[rd] = unsafe { (*upvals[uv_idx]).value };
|
||
return Ok(());
|
||
}
|
||
}
|
||
}
|
||
self.regs[rd] = JsValue::undefined();
|
||
Ok(())
|
||
}
|
||
|
||
/// 写入当前闭包的 upvalue：空槽惰性建 cell，TDZ/const 检查后写值置已初始化。
|
||
///
|
||
/// # 步骤
|
||
/// 1. b 槽为 upvalue 下标，源值为 `regs[a]`；`rd` 复用为 const 标志。
|
||
/// 2. 命中活动镜像表且非空：未初始化（TDZ）抛 ReferenceError，const 标志非 0
|
||
/// 抛 TypeError，否则写值置 initialized。
|
||
/// 3. 槽位为空（尚未建 cell）以源值新建已初始化 cell；下标越界或无 callee 静默返回。
|
||
///
|
||
/// # 边界与前提
|
||
/// - const 检查在 TDZ 检查之后，两者均先于写值。
|
||
///
|
||
/// # 注意事项
|
||
/// - 手写 IR 保留指令（同 `dispatch_make_cell`）。
|
||
#[allow(dead_code)]
|
||
pub(crate) fn dispatch_store_upvalue(&mut self, rd: usize, a: usize, b: usize) -> Result<(), String> {
|
||
let const_flag = rd;
|
||
let uv_idx = b;
|
||
let src_val = self.regs[a];
|
||
// 活动镜像是当前执行函数的表（非闭包为 null 空切片）：经 *mut 转可变
|
||
// 切片，与 upvalues_slice_mut 同口径（callee 是 GC 根、Box 单所有权）。
|
||
let upvals = unsafe { &mut *(self.active_upvalues as *mut [*mut Cell]) };
|
||
if uv_idx < upvals.len() {
|
||
if !upvals[uv_idx].is_null() {
|
||
unsafe {
|
||
let cell = &mut *upvals[uv_idx];
|
||
// TDZ 写检查：cell 未初始化（捕获绑定声明点前）写抛 ReferenceError。
|
||
if !cell.is_initialized() {
|
||
self.raise_error_kind(
|
||
"ReferenceError",
|
||
&Self::tdz_message(self.tdz_binding_name(uv_idx, true)),
|
||
)?;
|
||
return Ok(());
|
||
}
|
||
// const guard：TDZ 检查后 cell 必已初始化（存在性判定，与值无关），
|
||
// const 初始值为 undefined 时再赋值同样抛。
|
||
if const_flag != 0 {
|
||
self.raise_error_kind("TypeError", "Assignment to constant variable")?;
|
||
return Ok(());
|
||
}
|
||
cell.value = src_val;
|
||
cell.set_initialized(true);
|
||
}
|
||
vm_debug!("STORE_UPVALUE len={} wrote existing", upvals.len());
|
||
} else {
|
||
upvals[uv_idx] = self.realm.gc.borrow().alloc_cell(src_val, true);
|
||
}
|
||
}
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
impl Vm {
|
||
pub(crate) fn dispatch_create_regexp(&mut self, rd: usize, a: usize, b: usize) -> Result<Option<JsValue>, String> {
|
||
vm_trace!("CREATE_REGEXP rd={}", rd);
|
||
let pat_val = self.regs[a];
|
||
let flags_val = self.regs[b];
|
||
let ctor_ptr = self.realm.session.borrow().builtin_world().regexp_constructor.as_ptr() as *mut JsObject;
|
||
let ctor = unsafe { &*ctor_ptr };
|
||
let Some(native_fn) = ctor.native_fn() else {
|
||
self.raise_error_kind("TypeError", "RegExp constructor unavailable")?;
|
||
return Ok(Some(JsValue::undefined()));
|
||
};
|
||
let saved_0 = self.regs[0];
|
||
let saved_1 = self.regs[1];
|
||
let saved_2 = self.regs[2];
|
||
self.regs[0] = JsValue::undefined();
|
||
self.regs[1] = pat_val;
|
||
self.regs[2] = flags_val;
|
||
let func = unsafe { native_fn_ptr_to_fn(native_fn) };
|
||
let result = match func(self, &[0, 1, 2]) {
|
||
NativeResult::Ok(v) => v,
|
||
NativeResult::Err(e) => {
|
||
// 保留原始错误对象与类型（非法正则字面量须抛 SyntaxError，非 TypeError）。
|
||
self.exception_value = Some(e);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(e));
|
||
return self.unwind().map(|_| None);
|
||
}
|
||
NativeResult::TailCall { .. } => {
|
||
return Err(self.error_message_text("TypeError", "unexpected tail call"));
|
||
}
|
||
};
|
||
self.regs[0] = saved_0;
|
||
self.regs[1] = saved_1;
|
||
self.regs[2] = saved_2;
|
||
self.regs[rd] = result;
|
||
Ok(None)
|
||
}
|
||
|
||
pub(crate) fn dispatch_super_call(&mut self, rd: usize, a: usize) -> Result<bool, String> {
|
||
vm_debug!("SUPER_CALL depth={}", self.frames.len());
|
||
let first_arg_reg = a as u8;
|
||
let ext = self.bytecode[self.pc];
|
||
self.pc += 1;
|
||
let arg_count = (ext & 0xFF) as usize;
|
||
// ext 高 8 位 = 调用点存活上界（0 = 未编码/全量），压帧窗口按此截断。
|
||
let call_window = (ext >> 8) as u8;
|
||
|
||
let Some(frame) = self.frames.last() else {
|
||
self.raise_error_kind("ReferenceError", "super() used outside class constructor")?;
|
||
return Ok(true);
|
||
};
|
||
if !frame.is_derived_constructor {
|
||
self.raise_error_kind("ReferenceError", "super() used outside derived constructor")?;
|
||
return Ok(true);
|
||
}
|
||
if frame.super_called {
|
||
self.raise_error_kind("ReferenceError", "super() called more than once")?;
|
||
return Ok(true);
|
||
}
|
||
let Some(derived_this) = frame.constructed_this else {
|
||
self.raise_error_kind("ReferenceError", "super() without derived this")?;
|
||
return Ok(true);
|
||
};
|
||
let callee = frame.callee;
|
||
|
||
let new_target = self.regs[255];
|
||
if !new_target.is_object() {
|
||
self.raise_error_kind("TypeError", "super() new.target is not an object")?;
|
||
return Ok(true);
|
||
}
|
||
let new_target_obj = unsafe { &*new_target.as_js_object_ptr() };
|
||
// super 构造器取当前帧 callee（执行中的 derived 构造器）的原型，而非 newTarget：
|
||
// newTarget 跨 SUPER_CALL 压帧保持为最外层类，取其原型在中间 derived 层会
|
||
// 解析回同一父类，导致父帧被反复压入（多层继承栈溢出）。
|
||
if !callee.is_object() {
|
||
self.raise_error_kind("TypeError", "super() without constructor callee")?;
|
||
return Ok(true);
|
||
}
|
||
let callee_obj = unsafe { &*callee.as_js_object_ptr() };
|
||
let super_ctor = callee_obj.proto();
|
||
if !super_ctor.is_object() {
|
||
self.raise_error_kind("TypeError", "super constructor is not an object")?;
|
||
return Ok(true);
|
||
}
|
||
let super_obj = unsafe { &*super_ctor.as_js_object_ptr() };
|
||
if !super_obj.is_function() {
|
||
self.raise_error_kind("TypeError", "super constructor is not a function")?;
|
||
return Ok(true);
|
||
}
|
||
|
||
if super_obj.native_fn().is_some() {
|
||
// 实参先物化再走同步调用收口：native 调用协议把 253/254 槽固定为
|
||
// receiver/callee，实参寄存器（颜色 ≤253）占位 253 时裸引用会被覆写
|
||
// （与 SUPER_CALL_SPREAD 路径同形）。
|
||
let args: Vec<JsValue> = (0..arg_count)
|
||
.map(|i| self.regs[first_arg_reg.wrapping_add(i as u8) as usize])
|
||
.collect();
|
||
// 构造形态标记夹持（SUPER native 臂不写 reg255，new.target 继承
|
||
// 外层类构造器帧，形态判定只能靠本标记）。
|
||
let saved_constructing = self.constructing_native;
|
||
self.constructing_native = true;
|
||
let result = self.call_function_sync(super_ctor, derived_this, &args);
|
||
self.constructing_native = saved_constructing;
|
||
match result {
|
||
Ok(val) => {
|
||
// super() 返回实例的 [[Prototype]] 须设为 new.target.prototype
|
||
//（native 构造器不知道 new.target，由调用方设置）。
|
||
let instance = if val.is_object() { val } else { derived_this };
|
||
if instance.is_object() {
|
||
self.set_constructed_proto(instance, new_target_obj)?;
|
||
}
|
||
self.regs[254] = instance;
|
||
self.regs[rd] = self.regs[254];
|
||
self.mark_super_called();
|
||
}
|
||
Err(_) => {
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_error(self, "super() call failed"));
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
match self.unwind() {
|
||
Ok(()) => return Ok(true),
|
||
Err(e) => return Err(e),
|
||
}
|
||
}
|
||
}
|
||
} else if super_obj.sub_module_index() > 0 {
|
||
let sub_idx = super_obj.sub_module_index() as usize;
|
||
if self.callee_module(super_obj).is_none() {
|
||
// 上界取 super 目标自身代际平表长度（跨 run 调用时可异于当前代际）。
|
||
return Err(format!(
|
||
"SUPER_CALL: sub_module_index {} out of bounds (max {})",
|
||
sub_idx,
|
||
self.tables.get(&super_obj.table_gen()).map(|t| t.modules.len()).unwrap_or(0)
|
||
));
|
||
}
|
||
// 收敛到统一压帧入口：this = derived_this（super() 把实例交予父构造器），
|
||
// new.target 保持外层类；构造结果写回 regs[254]。
|
||
self.push_bytecode_frame(
|
||
super_ctor,
|
||
derived_this,
|
||
FrameArgs::RegRange {
|
||
first: first_arg_reg,
|
||
count: arg_count,
|
||
},
|
||
Some(254),
|
||
Some(derived_this),
|
||
new_target,
|
||
FrameContinuation::None,
|
||
call_window,
|
||
)?;
|
||
return Ok(true);
|
||
} else {
|
||
self.raise_error_kind("TypeError", "super constructor is not callable")?;
|
||
return Ok(true);
|
||
}
|
||
Ok(false)
|
||
}
|
||
|
||
/// super() 返回的构造实例其 [[Prototype]] 设为 new.target.prototype。
|
||
fn set_constructed_proto(&mut self, instance: JsValue, new_target_obj: &JsObject) -> Result<(), String> {
|
||
let proto_si = self.kernel_core.perm_interner().intern("prototype").0;
|
||
if let Some(proto_val) = self.resolve_property(new_target_obj, proto_si) {
|
||
if proto_val.is_object() {
|
||
let obj = unsafe { &mut *instance.as_js_object_ptr() };
|
||
obj.set_proto(proto_val).map_err(|e| e.to_string())?;
|
||
}
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// 置位当前 derived 帧的 super_called：native super 构造器同步返回后标记
|
||
/// super() 已成功调用（字节码父构造器路径由 do_return 在返回时置位）。
|
||
fn mark_super_called(&mut self) {
|
||
if let Some(frame) = self.frames.last_mut() {
|
||
if frame.is_derived_constructor {
|
||
frame.super_called = true;
|
||
}
|
||
}
|
||
}
|
||
|
||
pub(crate) fn dispatch_super_get_prop(&mut self, rd: usize, a: usize, b: usize) -> Result<bool, String> {
|
||
vm_trace!("SUPER_GET_PROP rd={} a={} b={}", rd, a, b);
|
||
let key_val = self.regs[b];
|
||
let prop_name_si = self.property_key_si(key_val)?;
|
||
let Some(frame) = self.frames.last() else {
|
||
self.raise_error_kind("ReferenceError", "super property used outside function")?;
|
||
return Ok(true);
|
||
};
|
||
if !frame.callee.is_object() {
|
||
self.raise_error_kind("ReferenceError", "super property has no home object")?;
|
||
return Ok(true);
|
||
}
|
||
let callee_obj = unsafe { &*frame.callee.as_js_object_ptr() };
|
||
let home_object = callee_obj.home_object();
|
||
if !home_object.is_object() {
|
||
self.raise_error_kind("ReferenceError", "super property has no home object")?;
|
||
return Ok(true);
|
||
}
|
||
let home_obj = unsafe { &*home_object.as_js_object_ptr() };
|
||
let super_base = home_obj.proto();
|
||
if !super_base.is_object() {
|
||
self.regs[rd] = JsValue::undefined();
|
||
} else {
|
||
let super_obj = unsafe { &*super_base.as_js_object_ptr() };
|
||
let val = self.ordinary_get_with_target(super_obj, prop_name_si, self.regs[a], rd as u8)?;
|
||
if self.accessor_frame_target_reg.take().is_none() {
|
||
self.regs[rd] = val;
|
||
}
|
||
}
|
||
Ok(false)
|
||
}
|
||
|
||
pub(crate) fn dispatch_set_home_object(&mut self, rd: usize, a: usize) -> Result<bool, String> {
|
||
vm_trace!("SET_HOME_OBJECT rd={} a={}", rd, a);
|
||
let func_val = self.regs[rd];
|
||
let home_val = self.regs[a];
|
||
if !func_val.is_object() || !home_val.is_object() {
|
||
self.raise_error_kind("TypeError", "SET_HOME_OBJECT expects function and object")?;
|
||
return Ok(true);
|
||
}
|
||
let func_obj = unsafe { &mut *func_val.as_js_object_ptr() };
|
||
if !func_obj.is_function() {
|
||
self.raise_error_kind("TypeError", "SET_HOME_OBJECT target is not a function")?;
|
||
return Ok(true);
|
||
}
|
||
func_obj.set_home_object(home_val);
|
||
Ok(false)
|
||
}
|
||
}
|
||
|
||
impl Vm {
|
||
/// 解析 spread 调用系 ext：读走 `nstatic | (nspread<<8)` 首字与 `nstatic+nspread`
|
||
/// 个有序实参字（静态字 = 寄存器号，spread 字高位标记）。
|
||
fn read_spread_ext(&mut self) -> Vec<usize> {
|
||
let header = self.bytecode[self.pc];
|
||
self.pc += 1;
|
||
let nstatic = (header & 0xFF) as usize;
|
||
let nspread = (header >> 8) as usize;
|
||
let mut words = Vec::with_capacity(nstatic + nspread);
|
||
for _ in 0..nstatic + nspread {
|
||
words.push(self.bytecode[self.pc] as usize);
|
||
self.pc += 1;
|
||
}
|
||
words
|
||
}
|
||
|
||
/// 按源码求值序物化完整实参 Vec：静态字直接读寄存器，spread 字迭代展开。
|
||
///
|
||
/// # 步骤
|
||
/// 1. 静态实参逐个从寄存器读入；spread 源经 `make_iterator_for_value` 迭代追加。
|
||
/// 2. 迭代中途抛错 → 当前迭代器经 return() 关闭（IteratorClose），异常恢复为 JS
|
||
/// 异常后 unwind。
|
||
/// 3. 展开总数超过 u16 上限（arguments_count 字段）→ RangeError。
|
||
///
|
||
/// # 返回值
|
||
/// - `Ok(Some(vec))` 成功；
|
||
/// - `Ok(None)` 异常已展开（调用方按 continue 处理）；
|
||
/// - `Err` 引擎错误直接传播。
|
||
fn materialize_spread_args(&mut self, words: &[usize]) -> Result<Option<Vec<JsValue>>, String> {
|
||
let mut args = Vec::with_capacity(words.len());
|
||
let next_si = self.kernel_core.perm_interner().intern("next").0;
|
||
let done_si = self.kernel_core.perm_interner().intern("done").0;
|
||
let value_si = self.kernel_core.perm_interner().intern("value").0;
|
||
for &w in words {
|
||
if w >> 31 == 1 {
|
||
let value = self.regs[w & 0x7FFF_FFFF];
|
||
let iterator = match make_iterator_for_value(self, value) {
|
||
Ok(it) => it,
|
||
Err(err) => {
|
||
self.exception_value = Some(err);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(err));
|
||
return self.unwind().map(|_| None);
|
||
}
|
||
};
|
||
loop {
|
||
let iter_obj = unsafe { &*iterator.as_js_object_ptr() };
|
||
let next_fn = match self.ordinary_get(iter_obj, next_si, iterator) {
|
||
Ok(v) => v,
|
||
Err(e) => return self.spread_iter_error(iterator, e, "Error"),
|
||
};
|
||
let result = match self.call_function_sync(next_fn, iterator, &[]) {
|
||
Ok(v) => v,
|
||
Err(e) => return self.spread_iter_error(iterator, e, "Error"),
|
||
};
|
||
if !result.is_object() {
|
||
return self.spread_iter_error(
|
||
iterator,
|
||
self.error_message_text("TypeError", "iterator result is not an object"),
|
||
"TypeError",
|
||
);
|
||
}
|
||
let result_obj = unsafe { &*result.as_js_object_ptr() };
|
||
let done = match self.ordinary_get(result_obj, done_si, result) {
|
||
Ok(v) => to_boolean(v),
|
||
Err(e) => return self.spread_iter_error(iterator, e, "Error"),
|
||
};
|
||
if done {
|
||
break;
|
||
}
|
||
let val = match self.ordinary_get(result_obj, value_si, result) {
|
||
Ok(v) => v,
|
||
Err(e) => return self.spread_iter_error(iterator, e, "Error"),
|
||
};
|
||
args.push(val);
|
||
if args.len() > u16::MAX as usize {
|
||
self.raise_error_kind("RangeError", "Too many arguments in function call")?;
|
||
return Ok(None);
|
||
}
|
||
}
|
||
} else {
|
||
args.push(self.regs[w]);
|
||
if args.len() > u16::MAX as usize {
|
||
self.raise_error_kind("RangeError", "Too many arguments in function call")?;
|
||
return Ok(None);
|
||
}
|
||
}
|
||
}
|
||
Ok(Some(args))
|
||
}
|
||
|
||
/// spread 迭代中途异常：先关闭当前迭代器（suppress return 自身错误，保留在途异常），
|
||
/// 再把原异常（native 错误经 last_uncaught_value 恢复）重新抛出并展开。
|
||
fn spread_iter_error(
|
||
&mut self, iterator: JsValue, msg: String, fallback_kind: &'static str,
|
||
) -> Result<Option<Vec<JsValue>>, String> {
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_kind_error(self, fallback_kind, &msg));
|
||
self.close_for_of_iterator(iterator, true)?;
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
self.unwind().map(|_| None)
|
||
}
|
||
|
||
/// CALL_SPREAD：运行期物化完整实参后按目标分派（native 走值传递，字节码走帧）。
|
||
pub(crate) fn dispatch_call_spread(&mut self, rd: usize, a: usize, _b: usize) -> Result<bool, String> {
|
||
let callee = self.regs[rd];
|
||
let this_value = self.regs[a];
|
||
let words = self.read_spread_ext();
|
||
let args = match self.materialize_spread_args(&words)? {
|
||
Some(args) => args,
|
||
None => return Ok(true),
|
||
};
|
||
if callee.is_object() {
|
||
let obj_ptr = callee.as_js_object_ptr();
|
||
if !obj_ptr.is_null() {
|
||
let obj = unsafe { &*obj_ptr };
|
||
if obj.is_function() {
|
||
if obj.is_class_constructor() {
|
||
return self
|
||
.raise_type_error("class constructor cannot be invoked without 'new'")
|
||
.map(|_| true);
|
||
}
|
||
if obj.native_fn().is_some() {
|
||
// spread 普通调用形态：清零构造形态标记。
|
||
self.constructing_native = false;
|
||
match self.call_function_sync(callee, this_value, &args) {
|
||
Ok(v) => {
|
||
self.regs[0] = v;
|
||
return Ok(false);
|
||
}
|
||
Err(_) => {
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_error(self, "call failed"));
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
return self.unwind().map(|_| true);
|
||
}
|
||
}
|
||
} else if obj.sub_module_index() > 0 {
|
||
// 按函数对象自身记录的表代际解析：表缺失（已回收）时落
|
||
// 普通压帧路径，由 push_bytecode_frame 按自身口径报错。
|
||
let sub = self.callee_module(obj);
|
||
// 异步生成器函数调用返回异步生成器迭代器对象。
|
||
if matches!(sub, Some(m) if m.is_generator && m.is_async) {
|
||
let gen_pc = self.pc;
|
||
let gen = self.create_async_generator_object(callee, this_value, &args)?;
|
||
// 参数初始化抛错已就地展开（unwind 改写 pc 至 catch）：异常值已
|
||
// 写入 catch 参数，再写结果寄存器会覆盖之——仅在初始化成功（pc 未动）
|
||
// 时交付生成器对象。
|
||
if self.pc == gen_pc {
|
||
self.regs[0] = gen;
|
||
}
|
||
return Ok(false);
|
||
}
|
||
// 生成器函数调用返回迭代器对象，不执行函数体。
|
||
if matches!(sub, Some(m) if m.is_generator) {
|
||
let gen_pc = self.pc;
|
||
let gen = self.create_generator_object(callee, this_value, &args)?;
|
||
// 参数初始化抛错已就地展开时不得覆盖 catch 参数（同上）。
|
||
if self.pc == gen_pc {
|
||
self.regs[0] = gen;
|
||
}
|
||
return Ok(false);
|
||
}
|
||
// 异步函数调用返回 capability promise，立即同步执行 body 到首个 await。
|
||
if matches!(sub, Some(m) if m.is_async) {
|
||
let promise = self.create_async_object(callee, this_value, &args)?;
|
||
self.regs[0] = promise;
|
||
return Ok(false);
|
||
}
|
||
self.push_bytecode_frame(
|
||
callee,
|
||
this_value,
|
||
FrameArgs::Slice(&args),
|
||
None,
|
||
None,
|
||
JsValue::undefined(),
|
||
FrameContinuation::None,
|
||
0,
|
||
)?;
|
||
return Ok(true);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
self.raise_type_error("CALL target is not callable").map(|_| true)
|
||
}
|
||
|
||
/// NEW_EXPRESSION_SPREAD：物化实参后按构造函数目标分派（native 走值传递，字节码走帧）。
|
||
pub(crate) fn dispatch_new_expression_spread(&mut self, rd: usize, a: usize, _b: usize) -> Result<bool, String> {
|
||
let constructor_reg = a;
|
||
let constructor = self.regs[constructor_reg];
|
||
|
||
if !constructor.is_object() {
|
||
return self
|
||
.raise_type_error("NEW_EXPRESSION: constructor is not an object")
|
||
.map(|_| true);
|
||
}
|
||
let ctor_ptr = constructor.as_js_object_ptr();
|
||
if ctor_ptr.is_null() {
|
||
return self.raise_type_error("NEW_EXPRESSION: constructor is null").map(|_| true);
|
||
}
|
||
let ctor_obj = unsafe { &*ctor_ptr };
|
||
if !ctor_obj.is_function() {
|
||
return self
|
||
.raise_type_error("NEW_EXPRESSION: constructor is not a function")
|
||
.map(|_| true);
|
||
}
|
||
if ctor_obj.is_arrow() {
|
||
return self
|
||
.raise_type_error("arrow functions cannot be used as constructors")
|
||
.map(|_| true);
|
||
}
|
||
// native 方法（非构造器）不可 new；bound 包装除外（其构造语义转发到 target）。
|
||
if ctor_obj.native_fn().is_some()
|
||
&& ctor_obj.type_tag != oxide_types::object::JsObject::OBJ_TYPE_CONSTRUCTOR
|
||
&& ctor_obj.type_tag != oxide_types::object::JsObject::OBJ_TYPE_BOUND
|
||
{
|
||
return self.raise_type_error("object is not a constructor").map(|_| true);
|
||
}
|
||
|
||
let words = self.read_spread_ext();
|
||
let args = match self.materialize_spread_args(&words)? {
|
||
Some(args) => args,
|
||
None => return Ok(true),
|
||
};
|
||
|
||
// bound 包装：解包链后转发到最内层 target（[[Construct]] 语义）。
|
||
if ctor_obj.type_tag == oxide_types::object::JsObject::OBJ_TYPE_BOUND {
|
||
let proto_ptr = self.realm.object_prototype.borrow().as_ptr() as *mut JsObject;
|
||
let new_obj = self.alloc_object(JsObject::new_empty(
|
||
oxide_kernel::shape_forge::EMPTY_SHAPE_ID,
|
||
JsValue::from_js_object(proto_ptr),
|
||
));
|
||
return self.dispatch_new_bound(rd, constructor, new_obj, args, 0);
|
||
}
|
||
|
||
let proto_ptr = self.realm.object_prototype.borrow().as_ptr() as *mut JsObject;
|
||
let new_obj = self.alloc_object(JsObject::new_empty(
|
||
oxide_kernel::shape_forge::EMPTY_SHAPE_ID,
|
||
JsValue::from_js_object(proto_ptr),
|
||
));
|
||
// GpFC 按构造器种类分读形：native 构造器保持裸存储读（占位 receiver
|
||
// 不可观测，构造体自重读覆盖可观测面）；字节码构造器走传播读（getter
|
||
// 异常原值上抛，非对象结果回落 Object.prototype）。
|
||
let proto_si = self.kernel_core.perm_interner().intern("prototype").0;
|
||
let proto_val = if ctor_obj.native_fn().is_some() {
|
||
self.resolve_property(ctor_obj, proto_si)
|
||
} else {
|
||
let pc_before = self.pc;
|
||
match self.ordinary_get(ctor_obj, proto_si, constructor) {
|
||
Ok(v) if self.pc == pc_before => Some(v),
|
||
Ok(_) => {
|
||
// getter 抛且已有 catch/finally 接手：展开已跳到落点，停构造流。
|
||
return Ok(true);
|
||
}
|
||
Err(err) => {
|
||
// 无处理器（或重入在途异常）：恢复原值走异常通道。
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_from_text(self, &err));
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
return self.unwind().map(|_| true);
|
||
}
|
||
}
|
||
};
|
||
if let Some(v) = proto_val {
|
||
if v.is_object() {
|
||
let new_obj_mut = unsafe { &mut *new_obj };
|
||
let proto_obj_ptr = v.as_js_object_ptr();
|
||
let _ = new_obj_mut.set_proto(JsValue::from_js_object(proto_obj_ptr));
|
||
}
|
||
}
|
||
let new_obj_val = JsValue::object(new_obj as *mut u8);
|
||
|
||
if ctor_obj.native_fn().is_some() {
|
||
// native 构造器：receiver 为新对象，值传递调用。newTarget 快照后置入
|
||
// reg(255) 暴露给 native 构造器（调用后恢复原值）；构造形态标记同窗
|
||
// 夹持（调用返回即恢复，先于结果分派，异常结局不残留）。
|
||
let saved_new_target = self.regs[255];
|
||
let saved_constructing = self.constructing_native;
|
||
self.regs[255] = constructor;
|
||
self.constructing_native = true;
|
||
let result = self.call_function_sync(constructor, new_obj_val, &args);
|
||
self.constructing_native = saved_constructing;
|
||
self.regs[255] = saved_new_target;
|
||
match result {
|
||
Ok(v) => {
|
||
self.regs[rd] = if v.is_object() { v } else { new_obj_val };
|
||
Ok(false)
|
||
}
|
||
Err(_) => {
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_error(self, "constructor call failed"));
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
self.unwind().map(|_| true)
|
||
}
|
||
}
|
||
} else if ctor_obj.sub_module_index() > 0 {
|
||
// 按构造器自身记录的表代际解析。
|
||
let sub = self.callee_module(ctor_obj);
|
||
// 生成器函数不是构造器：`new g()` 抛 TypeError。
|
||
if matches!(sub, Some(m) if m.is_generator) {
|
||
return self.raise_type_error("g is not a constructor").map(|_| true);
|
||
}
|
||
// 异步函数不是构造器：`new f()` 抛 TypeError。
|
||
if matches!(sub, Some(m) if m.is_async) {
|
||
return self.raise_type_error("g is not a constructor").map(|_| true);
|
||
}
|
||
let this_value = if ctor_obj.is_derived_constructor() {
|
||
JsValue::undefined()
|
||
} else {
|
||
new_obj_val
|
||
};
|
||
self.push_bytecode_frame(
|
||
constructor,
|
||
this_value,
|
||
FrameArgs::Slice(&args),
|
||
Some(rd as u8),
|
||
Some(new_obj_val),
|
||
constructor,
|
||
FrameContinuation::None,
|
||
0,
|
||
)?;
|
||
Ok(true)
|
||
} else {
|
||
let error =
|
||
oxide_builtins::error::create_error(self, "NEW_EXPRESSION: bytecode constructors not yet supported");
|
||
self.exception_value = Some(error);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(error));
|
||
self.unwind().map(|_| true)
|
||
}
|
||
}
|
||
|
||
/// SUPER_CALL_SPREAD：物化实参后按父构造器目标分派（native 走值传递，字节码走帧）。
|
||
pub(crate) fn dispatch_super_call_spread(&mut self, rd: usize, _a: usize) -> Result<bool, String> {
|
||
let words = self.read_spread_ext();
|
||
|
||
let Some(frame) = self.frames.last() else {
|
||
self.raise_error_kind("ReferenceError", "super() used outside class constructor")?;
|
||
return Ok(true);
|
||
};
|
||
if !frame.is_derived_constructor {
|
||
self.raise_error_kind("ReferenceError", "super() used outside derived constructor")?;
|
||
return Ok(true);
|
||
}
|
||
if frame.super_called {
|
||
self.raise_error_kind("ReferenceError", "super() called more than once")?;
|
||
return Ok(true);
|
||
}
|
||
let Some(derived_this) = frame.constructed_this else {
|
||
self.raise_error_kind("ReferenceError", "super() without derived this")?;
|
||
return Ok(true);
|
||
};
|
||
let callee = frame.callee;
|
||
|
||
let new_target = self.regs[255];
|
||
if !new_target.is_object() {
|
||
self.raise_error_kind("TypeError", "super() new.target is not an object")?;
|
||
return Ok(true);
|
||
}
|
||
let new_target_obj = unsafe { &*new_target.as_js_object_ptr() };
|
||
// 同 dispatch_super_call：super 构造器取当前帧 callee 的原型（newTarget
|
||
// 保持为最外层类，取其原型在中间 derived 层会反复压入同一父帧）。
|
||
if !callee.is_object() {
|
||
self.raise_error_kind("TypeError", "super() without constructor callee")?;
|
||
return Ok(true);
|
||
}
|
||
let callee_obj = unsafe { &*callee.as_js_object_ptr() };
|
||
let super_ctor = callee_obj.proto();
|
||
if !super_ctor.is_object() {
|
||
self.raise_error_kind("TypeError", "super constructor is not an object")?;
|
||
return Ok(true);
|
||
}
|
||
let super_obj = unsafe { &*super_ctor.as_js_object_ptr() };
|
||
if !super_obj.is_function() {
|
||
self.raise_error_kind("TypeError", "super constructor is not a function")?;
|
||
return Ok(true);
|
||
}
|
||
|
||
let args = match self.materialize_spread_args(&words)? {
|
||
Some(args) => args,
|
||
None => return Ok(true),
|
||
};
|
||
|
||
if super_obj.native_fn().is_some() {
|
||
// 构造形态标记夹持（SUPER native 臂不写 reg255，new.target 继承
|
||
// 外层类构造器帧，形态判定只能靠本标记）。
|
||
let saved_constructing = self.constructing_native;
|
||
self.constructing_native = true;
|
||
let result = self.call_function_sync(super_ctor, derived_this, &args);
|
||
self.constructing_native = saved_constructing;
|
||
match result {
|
||
Ok(val) => {
|
||
// super() 返回实例的 [[Prototype]] 须设为 new.target.prototype
|
||
let instance = if val.is_object() { val } else { derived_this };
|
||
if instance.is_object() {
|
||
self.set_constructed_proto(instance, new_target_obj)?;
|
||
}
|
||
self.regs[254] = instance;
|
||
self.regs[rd] = instance;
|
||
self.mark_super_called();
|
||
}
|
||
Err(_) => {
|
||
let exc = self
|
||
.last_uncaught_value
|
||
.take()
|
||
.unwrap_or_else(|| oxide_builtins::error::create_error(self, "super() call failed"));
|
||
self.exception_value = Some(exc);
|
||
self.pending_error_kind = Some(self.thrown_error_kind(exc));
|
||
self.unwind().map(|_| true)?;
|
||
}
|
||
}
|
||
Ok(false)
|
||
} else if super_obj.sub_module_index() > 0 {
|
||
self.push_bytecode_frame(
|
||
super_ctor,
|
||
derived_this,
|
||
FrameArgs::Slice(&args),
|
||
Some(254),
|
||
Some(derived_this),
|
||
new_target,
|
||
FrameContinuation::None,
|
||
0,
|
||
)?;
|
||
Ok(true)
|
||
} else {
|
||
self.raise_error_kind("TypeError", "super constructor is not callable")?;
|
||
Ok(true)
|
||
}
|
||
}
|
||
}
|