gcc - GDB 的下一条命令向后跳转到作用域末尾的所有堆栈分配对象

问题描述

当我在一个范围内有堆栈分配的对象（大括号内的一组命令），并且我next在该范围的末尾使用时，gdb 会以相反的顺序跳回到每个堆栈分配的对象所在的位置。

这在调试过程中是令人不安的：当有很多堆栈分配的对象实例时，调试器会向后跳转到每个实例，并且只有在完成后才会继续前进。相反，我希望它在范围之后继续到下一行。

有没有办法将 gdb 配置为不这样做，或者这是我在构建时需要传递给 gcc 的一些标志？

起初，我以为是我在编译使用-O0什么的（GDB 以乱序方式跳到错误的行），但这里不是这种情况。

这是我的构建方式：

/opt/rh/devtoolset-6/root/usr/bin/c++  -MD -DDEBUG -g -ggdb -gstabs+  -fPIC  -Wall -Werror -Wsynth -Wno-comment -Wreturn-type   main.cpp -c -o main.o
/opt/rh/devtoolset-6/root/usr/bin/c++  -MD -DDEBUG -g -ggdb -gstabs+  -fPIC  -Wall -Werror -Wsynth -Wno-comment -Wreturn-type   main.o -L. -L/opt/rh/devtoolset-6/root/usr/lib64 -lstdc++  -o main.exe

下面是我在调试器中看到的。注意涉及的 GDB 版本：

bash-4.2$ gdb main.exe
GNU gdb (GDB) Red Hat Enterprise Linux 7.12.1-48.el6
Copyright (C) 2017 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".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from main.exe...done.
(gdb) b main
Breakpoint 1 at 0x400a27: file main.cpp, line 45.
(gdb) r
Starting program: /home/brentg/scratch_sandboxes/cxxminimal/main.exe 
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.192.el6.x86_64

Breakpoint 1, main (argc=1, argv=0x7fffffffeb38, envp=0x7fffffffeb48)
    at main.cpp:45
45    std::cout << __FILE__ << ":" << __LINE__ << ":" << "main begin" << std::endl;
Missing separate debuginfos, use: debuginfo-install libgcc-4.4.7-17.el6.x86_64 libstdc++-4.4.7-17.el6.x86_64
(gdb) l
40    std::cout << __FILE__ << ":" << __LINE__ << ":" << "printing some info 2" << std::endl;
41  }
42  
43  int main(int argc, char *argv[], char *const envp[])
44  {
45    std::cout << __FILE__ << ":" << __LINE__ << ":" << "main begin" << std::endl;
46    some_function_that_uses_Foo();
47    std::cout << __FILE__ << ":" << __LINE__ << ":" << "main end" << std::endl;
48    return 0;
49  } // end main
(gdb) n
main.cpp:45:main begin
46    some_function_that_uses_Foo();
(gdb) s
some_function_that_uses_Foo () at main.cpp:38
38    std::cout << __FILE__ << ":" << __LINE__ << ":" << "printing some info 1" << std::endl;
(gdb) n
main.cpp:38:printing some info 1
39    Foo the_foo1;
(gdb) n
40    std::cout << __FILE__ << ":" << __LINE__ << ":" << "printing some info 2" << std::endl;
(gdb) l
35  
36  void some_function_that_uses_Foo()
37  {
38    std::cout << __FILE__ << ":" << __LINE__ << ":" << "printing some info 1" << std::endl;
39    Foo the_foo1;
40    std::cout << __FILE__ << ":" << __LINE__ << ":" << "printing some info 2" << std::endl;
41  }
42  
43  int main(int argc, char *argv[], char *const envp[])
44  {
(gdb) n
main.cpp:40:printing some info 2
39    Foo the_foo1;

在这一点上，我想知道：为什么我现在又回到了第 39 行？当我在第 40 行时，输入“下一个”，然后它似乎向后跳。

查看“下一个”命令的 gdb 手册，我没有看到任何关于 C++ 构造函数/析构函数的内容。

标签： gccgdbstack-frame

gcc - GDB 的下一条命令向后跳转到作用域末尾的所有堆栈分配对象

问题描述

解决方案

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