修正了一些错误

includes/memhub.py

@@ -429,6 +429,13 @@ class MemBuddy(MemManager):
                     if block is not None:
                         c.DerefAs(block, t.CVoid(t.CUInt64T((order << 1) | 1), t.CPtr))
                         result = t.CVoid(t.CUInt64T(block) + MEMBUDDY_HEADER_SIZE, t.CPtr)
+        if result is None:
+            # 分配失败: 打印内存使用情况
+            fb: t.CSizeT = self.free_bytes()
+            ub: t.CSizeT = self.usable_size - fb
+            stdio.printf("[MEM-FAIL] alloc(%zu) failed: total=%zu used=%zu free=%zu free_blocks=%zu\n",
+                         size, self.usable_size, ub, fb, self.free_count())
+            stdio.fflush(0)
         self._unlock()
         return result
 
@@ -503,6 +510,32 @@ class MemBuddy(MemManager):
                 cur = t.CVoid(c.Deref(t.CUInt64T(cur, t.CPtr)), t.CPtr)
         return count
 
+    def free_bytes(self) -> t.CSizeT:
+        # 统计所有空闲块的总字节数
+        total: t.CSizeT = 0
+        i: t.CInt
+        for i in range(MEMBUDDY_MAX_ORDERS + 1):
+            head_val: t.CUInt64T = self.free_lists[i]
+            cur: t.CVoid | t.CPtr = t.CVoid(head_val, t.CPtr)
+            while t.CUInt64T(cur) != 0:
+                total += _block_size_at_order(i)
+                cur = t.CVoid(c.Deref(t.CUInt64T(cur, t.CPtr)), t.CPtr)
+        return total
+
+    def used_bytes(self) -> t.CSizeT:
+        # 已使用字节数 = 可用区总大小 - 空闲字节数
+        return self.usable_size - self.free_bytes()
+
+    def dump_stats(self, label: t.CChar | t.CPtr):
+        # 打印内存使用统计
+        fb: t.CSizeT = self.free_bytes()
+        ub: t.CSizeT = self.usable_size - fb
+        stdio.printf("[MEM] %s: total=%zu used=%zu (%zu%%) free=%zu free_blocks=%zu\n",
+                     label, self.usable_size, ub,
+                     (ub * 100) / self.usable_size if self.usable_size > 0 else 0,
+                     fb, self.free_count())
+        stdio.fflush(0)
+
     def self_check(self) -> t.CInt:
         # 验证伙伴分配器内部一致性，返回 0=OK，非 0=损坏
         if self.usable is None: