From 35fdb25d273dfc1e456b5663d930c72824c44cd1 Mon Sep 17 00:00:00 2001
From: Luke <luke.k.xu@hotmail.com>
Date: Fri, 29 Aug 2025 18:22:31 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E5=AE=9E=E7=8E=B0=E6=95=B0=E7=BB=84?=
 =?UTF-8?q?=E8=87=AA=E5=8A=A8=E6=89=A9=E5=AE=B9=E5=8A=9F=E8=83=BD?=
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- 在 SyscallCommand 类中的列表操作中增加了自动扩容逻辑
- 当访问的索引超过当前列表大小时，自动将列表大小扩展到该索引
- 这种实现允许在 append操作时直接使用 set 方法，而不需要额外判断
---
 .../commands/system/control/SyscallCommand.java   | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/jcnc/snow/vm/commands/system/control/SyscallCommand.java b/src/main/java/org/jcnc/snow/vm/commands/system/control/SyscallCommand.java
index 80428fa..2bdd5fe 100644
--- a/src/main/java/org/jcnc/snow/vm/commands/system/control/SyscallCommand.java
+++ b/src/main/java/org/jcnc/snow/vm/commands/system/control/SyscallCommand.java
@@ -400,9 +400,20 @@ public class SyscallCommand implements Command {
                         // 必须是可变 List
                         @SuppressWarnings("unchecked")
                         java.util.List<Object> mlist = (java.util.List<Object>) list;
-                        if (idx < 0 || idx >= mlist.size())
+                        if (idx < 0) {
                             throw new IndexOutOfBoundsException("数组下标越界: " + idx + " (长度 " + mlist.size() + ")");
-                        mlist.set(idx, value);
+                        }
+                        // 允许自动扩容：当 idx == size 时等价于 append；当 idx > size 时以 null 填充到 idx-1，再 set(idx, value)
+                        if (idx >= mlist.size()) {
+                            // 以 null 填充直到 size == idx
+                            while (mlist.size() < idx) {
+                                mlist.add(null);
+                            }
+                            // 此时 size == idx，直接追加
+                            mlist.add(value);
+                        } else {
+                            mlist.set(idx, value);
+                        }
                     } else if (arrObj != null && arrObj.getClass().isArray()) {
                         int len = java.lang.reflect.Array.getLength(arrObj);
                         if (idx < 0 || idx >= len)