fix: 修复 switch case 标签冲突与大 switch 寄存器回绕

2026-06-08 23:45:00 +08:00
parent afcc76a222
commit bf75fcd0c9
5 changed files with 50 additions and 3 deletions
@@ -299,6 +299,7 @@ impl Compiler {
                ctx.push_switch(end_label);

                let disc_reg = self.emit_expression(&sw.discriminant, ctx)?;
+                let compare_reg_checkpoint = ctx.reg_checkpoint();
                let cases = &sw.cases;

                for (case_idx, case) in cases.iter().enumerate() {
@@ -307,10 +308,11 @@ impl Compiler {
                        let eq_reg = ctx.alloc_reg();
                        ctx.emit(opcode::encode(OpCode::EQ, eq_reg, disc_reg, test_reg));

-                        let case_label = Label::SwitchCase(id * 256 + case_idx as u32);
+                        let case_label = Label::SwitchCase(id, case_idx as u32);
                        let body_pos = ctx.resolve_label(case_label)?;
                        let offset = (body_pos as isize) - (ctx.bytecode.len() as isize);
                        ctx.emit(opcode::encode_jmp_if_true(eq_reg, offset as i16));
+                        ctx.restore_reg_checkpoint(compare_reg_checkpoint);
                    }
                }