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Nazz

栈扩容是内存安全的吗

  •   
  •   Nazz Sep 21, 2023 1820 views
    This topic created in 952 days ago, the information mentioned may be changed or developed.

    函数里面用了 unsafe.Pointer

  • Unsafe
  • pointer
  • 函数
  • 扩容
    5 replies    2023-09-21 17:10:16 +08:00
    CapNemo
        1
    CapNemo  
       Sep 21, 2023   1
    如果你没有打算使用 cgo ，是安全的。涉及 unsafe.Pointer 的对象会自动逃逸到堆上。
    如果要写 cgo 库，那就很复杂了。
    CapNemo
        2
    CapNemo  
       Sep 21, 2023
    抱歉，unsafe.Pointer 是会被自动追踪
    Nazz
        3
    Nazz  
    OP
       Sep 21, 2023
    @CapNemo 不涉及 uintptr 和 cgo. 是安全的, 那就不需要标注 go:nosplit 了
    CapNemo
        4
    CapNemo  
       Sep 21, 2023
    但是从 unsafe.Pointer 取 uint64 就不安全了
    Nazz
        5
    Nazz  
    OP
       Sep 21, 2023
    @CapNemo 只用了结构体指针首地址, 没计算偏移量
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