From 3ab3b3214c6468b388c8eff8a96948a585ec6567 Mon Sep 17 00:00:00 2001
From: sql-hkr <sql.hkr@gmail.com>
Date: Thu, 13 Nov 2025 00:10:34 +0900
Subject: [PATCH] fix: terminal highlight (#30)

---
 src/tiny8/cpu.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/tiny8/cpu.py b/src/tiny8/cpu.py
index 82aa267..447752c 100644
--- a/src/tiny8/cpu.py
+++ b/src/tiny8/cpu.py
@@ -353,6 +353,7 @@ def step(self) -> bool:
             self.running = False
             return False
 
+        pre_exec_pc = self.pc
         instr, operands = self.program[self.pc]
 
         # Build textual form of the instruction for tracing (uppercase mnemonic
@@ -396,11 +397,12 @@ def fmt_op(o):
 
         # record step trace after execution (post-state)
         self.step_count += 1
-        source_line = self.pc_to_line.get(self.pc, -1)
+
+        source_line = self.pc_to_line.get(pre_exec_pc, -1)
         self.step_trace.append(
             {
                 "step": self.step_count,
-                "pc": self.pc,
+                "pc": pre_exec_pc,
                 "instr": instr_text,
                 "regs": regs_snapshot,
                 "mem": mem_snapshot,