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fix: 不可写全局内置（undefined/NaN/Infinity）寄存器镜像写编译期拦截——sloppy 静默 no-op、strict 抛 TypeError

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This commit is contained in:
彭俊皓
2026-09-09 23:17:01 +08:00
parent 2457f283fe
commit b77a9322e5
9 changed files with 394 additions and 33 deletions
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crates/oxide_emit/src/expr/operator/mod.rs
+34 -1
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@@ -506,6 +506,10 @@ impl Emitter {
/// 标识符自增/自减的静态路径：upvalue / 被捕获 cell 走显式读-增减-写回，
/// 普通槽用 INC_PRE/POST 或 DEC_PRE/POST。返回结果寄存器。
///
/// # 边界与前提
/// - 不可写全局内置槽：值照算（前缀返回新值、后缀返回旧值）但跳过槽写；
/// strict 抛 TypeError。局部遮蔽绑定不受影响。
fn emit_identifier_update_static(
&self, name: &str, update: &oxide_parser::UpdateExpression, ctx: &mut CompileCtx,
) -> Result<u32, String> {
@@ -522,13 +526,24 @@ impl Emitter {
// update 写寄存器供下一迭代 fresh 拷贝，不污染本迭代闭包捕获的 cell）。
if ctx.register_update_names.iter().any(|n| n == name) {
if let Some(reg) = ctx.scopes.symbols.lookup_any(name) {
let result_reg = ctx.alloc_reg();
let op = match (update.operator, update.prefix) {
(UpdateOperator::Increment, true) => OpCode::INC_PRE,
(UpdateOperator::Increment, false) => OpCode::INC_POST,
(UpdateOperator::Decrement, true) => OpCode::DEC_PRE,
(UpdateOperator::Decrement, false) => OpCode::DEC_POST,
};
if ctx.targets_readonly_builtin(name, reg) {
if ctx.is_strict {
return self.emit_throw_error("TypeError", "cannot assign to read-only property", ctx);
}
// 全局不可写内置：值照算（前缀返回新值、后缀返回旧值），跳过槽写。
let tmp_reg = ctx.alloc_reg();
ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(tmp_reg), Operand::Reg(reg), Operand::None));
let result_reg = ctx.alloc_reg();
ctx.inst(Inst::new(op, Operand::Reg(tmp_reg), Operand::Reg(result_reg), Operand::Reg(result_reg)));
return Ok(result_reg);
}
let result_reg = ctx.alloc_reg();
ctx.inst(Inst::new(op, Operand::Reg(reg), Operand::Reg(result_reg), Operand::Reg(result_reg)));
return Ok(result_reg);
}
@@ -599,6 +614,24 @@ impl Emitter {
Ok(if update.prefix { new_reg } else { old_reg })
} else {
let var_reg = ctx.lookup_or_global(name);
if ctx.targets_readonly_builtin(name, var_reg) {
// 全局不可写内置槽：strict 抛 TypeError（put 失败）；sloppy 值照算
// （前缀返回新值、后缀返回旧值），跳过槽写。
if ctx.is_strict {
return self.emit_throw_error("TypeError", "cannot assign to read-only property", ctx);
}
let tmp_reg = ctx.alloc_reg();
ctx.inst(Inst::new(OpCode::LOAD_VAR, Operand::Reg(tmp_reg), Operand::Reg(var_reg), Operand::None));
let result_reg = ctx.alloc_reg();
let op = match (update.operator, update.prefix) {
(UpdateOperator::Increment, true) => OpCode::INC_PRE,
(UpdateOperator::Increment, false) => OpCode::INC_POST,
(UpdateOperator::Decrement, true) => OpCode::DEC_PRE,
(UpdateOperator::Decrement, false) => OpCode::DEC_POST,
};
ctx.inst(Inst::new(op, Operand::Reg(tmp_reg), Operand::Reg(result_reg), Operand::Reg(result_reg)));
return Ok(result_reg);
}
let is_implicit = ctx.implicit_global_writes.contains(&var_reg);
if is_implicit && ctx.is_strict {
// 严格模式未声明更新写：值无关抛 ReferenceError。