C :: B中的调试器。无法打开cygwin.S

Hi I just discovered a quite weird behaviour of the debugger when declaring a simple two-dimensional array. It looks like it can't open a file cygwin.S in the library.

嗨我刚刚在声明一个简单的二维数组时发现了一个非常奇怪的调试器行为。看起来它无法在库中打开文件cygwin.S。

Cannot open file: ../../../../../src/gcc-4.8.1/libgcc/config/i386/cygwin.S

无法打开文件：../../../../../src/gcc-4.8.1/libgcc/config/i386/cygwin.S

At ../../../../../src/gcc-4.8.1/libgcc/config/i386/cygwin.S:169

在../../../../../src/gcc-4.8.1/libgcc/config/i386/cygwin.S:169

An execution without debugging works fine. There is an example of the code:

没有调试的执行工作正常。有一个代码示例：

#include <stdio.h>
#include <stdlib.h>

int main()
{
    const int strNumTries = 15;
    const int strLength = 98;
    char strName[strLength][strNumTries];

    printf("Hello world!\n");

    return 0;
}

Debugger stops on the char array declaration using 'step in' method. So what's the problem it may be?

调试器使用'step in'方法停止char数组声明。那可能是什么问题呢？

2 个解决方案

#1

I suspect your seeing something like this:

我怀疑你看到这样的事情：

GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
Copyright (C) 2014 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-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 untitled...done.
(gdb) br main
Breakpoint 1 at 0x4005f1: file untitled.c, line 6.
(gdb) r
Starting program: /home/xxxx/untitled 
.
.
.

Breakpoint 1, main () at untitled.c:6
6       const int strNumTries = 15;
(gdb) s
7       const int strLength = 98;
(gdb) 
8       char strName[strLength][strNumTries];
(gdb) 
10      printf("Hello world!\n");
(gdb) 
_IO_puts (str=0x400794 "Hello world!") at ioputs.c:34
34  ioputs.c: No such file or directory.
(gdb) 
36  in ioputs.c
(gdb) 
strlen () at ../sysdeps/x86_64/strlen.S:66
66  ../sysdeps/x86_64/strlen.S: No such file or directory.
(gdb) 
67  in ../sysdeps/x86_64/strlen.S
(gdb) 
68  in ../sysdeps/x86_64/strlen.S

where that last line repeats many times before moving on to any other sub functions.

在移动到任何其他子功能之前，最后一行重复多次。

This is not an error, but rather part of the call to printf()

这不是错误，而是对printf（）的调用的一部分

the following is the only gdb output that has anything to do with the array declaration:

以下是唯一与数组声明有关的gdb输出：

8       char strName[strLength][strNumTries];

#2

Not sure if this will help your situation, but ...

不确定这是否有助于你的情况，但......

I had exactly the same errors from GDB, and GDB admitted it had failed and had a problem (see GDB listing below). I could reproduce this with GCC/gFortran 6.4 and 7.1 100% (running C::B under Win, with MingW).

我从GDB得到了完全相同的错误，并且GDB承认它已经失败并且遇到了问题（参见下面的GDB列表）。我可以用GCC / gFortran 6.4和7.1 100％（在Win下用MingW运行C :: B）重现这个。

Of course, I had not ever installed cygwin, and I only use seh and sjlj variants of the MingW64 compilers. Also, I don't have, and never had any of the dir's that GDB is complaining about (e.g. "/../src/gcc-7.1.0/") so it made no sense ... and the problem arose only after adding one more ostensibly similar s/r to my lib of thousands of s/r's (none of which ever complained about this).

当然，我还没有安装过cygwin，我只使用了MingW64编译器的seh和sjlj变体。另外，我没有，并且从来没有任何GDB抱怨的目录（例如“/../src/gcc-7.1.0/”）所以没有意义......问题只出现了在我的数千个s / r的lib中添加了一个表面上相似的s / r之后（没有人抱怨过这个）。

... to make a long story short, the problem turned out to be "out of stack space", as I had declared some (Automatic) arrays with large size. Changing either the array sizes (smaller) or changing the Automatic arrays to Allocatable arrays (the former goes on the stack, the later on the heap) fixed the problem.

...长话短说，问题结果是“堆栈空间不足”，因为我已经声明了一些大尺寸的（自动）数组。更改数组大小（更小）或将自动数组更改为可分配数组（前者进入堆栈，后者在堆上）修复了问题。

... so, GDB seems to have a bug, and its complaints had nothing to do with the actual error.

...所以，GDB似乎有一个bug，它的抱怨与实际错误无关。

---- for completeness, here is the relevant portion of my GDB listing:

----为了完整性，这是我的GDB列表的相关部分：

[debug][New Thread 740.0x9fc]
[debug]172      ../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S: No such file or directory.
[debug]Thread 1 received signal SIGSEGV, Segmentation fault.
[debug]__chkstk_ms () at ../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S:172
[debug]>>>>>>cb_gdb:
[debug]> info frame
[debug]Stack level 0, frame at 0x136f00:
[debug] eip = 0x664974bb in __chkstk_ms (../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S:172); saved eip = 0x664958b3
[debug] called by frame at 0x136f14
[debug] source language asm.
[debug] Arglist at 0x136ef8, args:
[debug] Locals at 0x136ef8, Previous frame's sp is 0x136f00
[debug] Saved registers:
[debug]  eax at 0x136ef4, ecx at 0x136ef8, eip at 0x136efc
[debug]>>>>>>cb_gdb:

Cannot open file: ../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S
At ../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S:172

[debug]> info locals
[debug]No locals.
[debug]>>>>>>cb_gdb:
[debug]> info args
[debug]No symbol table info available.
[debug]>>>>>>cb_gdb:
[debug]> bt 30
[debug]../../../../src/gdb-7.11.1/gdb/dwarf2loc.c:364: internal-error: dwarf_expr_frame_base: Assertion `framefunc != NULL' failed.
[debug]A problem internal to GDB has been detected,
[debug]further debugging may prove unreliable.
[debug]This is a bug, please report it.  For instructions, see:
[debug]<http://www.gnu.org/software/gdb/bugs/>.
[debug]This application has requested the Runtime to terminate it in an unusual way.
[debug]Please contact the application's support team for more information.
[debug]#0  __chkstk_ms () at ../../../../../src/gcc-7.1.0/libgcc/config/i386/cygwin.S:172
[debug]#1  0x664958b3 in fadcern_sixtrack_xl (

Debugger finished with status 1

#1