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gdb不知為何顯示2次析構

gdb不知為何顯示2次析構

(金慶的專欄 2016.11)

gdb 顯示2次 A::~A():

    (gdb) bt
    #0 A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    #1 0x0000000000400a96 in A::~A (this=0x602010, __in_chrg=<optimized out>)
        at main.cpp:12
    #2 0x00000000004009c0 in main () at main.cpp:18

代碼如下：

    class A
    {
    public:
        A() {}
        virtual ~A()
        {
            cout << "~A()" << endl;
        }
    };

    int main()
    {
        A* p = new A;
        delete p;
        return 0;
    }

打斷點顯示：2 locations:

    (gdb) b A::~A
    Breakpoint 1 at 0x400a40: A::~A. (2 locations)

完整的 gdb 輸出:

    g++ -g main.cpp
    [jinq@localhost test]$ gdb a.out
    GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
    Copyright (C) 2013 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law. Type "show copying"
    and "show warranty" for details.
    This GDB was configured as "x86_64-redhat-linux-gnu".
    For bug reporting instructions, please see:
    <http://www.gnu.org/software/gdb/bugs/>...
    Reading symbols from /home/jinq/test/a.out...done.
    (gdb) b A::~A
    Breakpoint 1 at 0x400a40: A::~A. (2 locations)
    (gdb) run
    Starting program: /home/jinq/test/a.out

    Breakpoint 1, A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:12
    12          }
    Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.8.x86_64 libgcc-4.8.5-4.el7.x86_64 libstdc++-4.8.5-4.el7.x86_64
    (gdb) bt
    #0 A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:12
    #1 0x00000000004009c0 in main () at main.cpp:18
    (gdb) s

    Breakpoint 1, A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    10          {
    (gdb) bt
    #0 A::~A (this=0x602010, __in_chrg=<optimized out>) at main.cpp:10
    #1 0x0000000000400a96 in A::~A (this=0x602010, __in_chrg=<optimized out>)
        at main.cpp:12
    #2 0x00000000004009c0 in main () at main.cpp:18
    (gdb) ^CQuit
    (gdb)

虛析構函數(shù)并且是delete才這樣。

Also see: http://lists.qt-project.org/pipermail/interest/2015-November/019691.html

已提交Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=20837

posted on 2016-11-18 16:19 金慶閱讀(872) 評論(0) 編輯收藏引用所屬分類: 1. C/C++

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