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fix: const 声明 STORE_VAR 恒 b=0 致寄存器复用误抛

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彭俊皓
2026-08-06 16:03:09 +08:00
parent be91604fef
commit 5988696f5b
2 changed files with 57 additions and 1 deletions
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crates/oxide_emit/src/shared/binding.rs
+5 -1
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@@ -49,7 +49,11 @@ impl Emitter {
if let Some(&cell_idx) = ctx.captured_bindings.get(name) {
ctx.inst(Inst::new(OpCode::MAKE_CELL, Operand::Reg(src_reg as u32), Operand::Imm(cell_idx as u16), Operand::None));
} else {
ctx.inst(Inst::new(OpCode::STORE_VAR, Operand::Reg(target_reg as u32), Operand::Reg(src_reg as u32), Operand::Imm(if is_const { 1 } else { 0 })));
// B011: const 声明路径 STORE_VAR 恒 b=0，不查运行时 guard。
// guard 读 regs[rd] 判断槽是否已初始化，依赖槽初始为 undefined；
// 声明冗余检查由编译期 declare() 完成（重复声明编译报错），
// 运行时 guard 只服务"对 const 再赋值"（赋值路径，见 emit_assign_target）。
ctx.inst(Inst::new(OpCode::STORE_VAR, Operand::Reg(target_reg as u32), Operand::Reg(src_reg as u32), Operand::Imm(0)));
}
ctx.init_var(name);
Ok(())