我正在跟随《用最笨的方法学C语言》,具体地说是关于Valgrind的章节。这一章提供了一个故意写错的程序,以展示Valgrind的工作原理。
当我在Valgrind下运行练习时,我的堆栈跟踪中没有行号,只有“(below main)”表示错误。
我肯定使用-g标志进行编译。
我的Valgrind输出如下:
djb@twin:~/projects/Learning/C$ valgrind ./ex4
==5190== Memcheck, a memory error detector
==5190== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==5190== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
==5190== Command: ./ex4
==5190==
==5190== Use of uninitialised value of size 4
==5190== at 0x4078B2B: _itoa_word (_itoa.c:195)
==5190== by 0x407CE55: vfprintf (vfprintf.c:1619)
==5190== by 0x40831DE: printf (printf.c:35)
==5190== by 0x4052112: (below main) (libc-start.c:226)
==5190==
==5190== Conditional jump or move depends on uninitialised value(s)
==5190== at 0x4078B33: _itoa_word (_itoa.c:195)
==5190== by 0x407CE55: vfprintf (vfprintf.c:1619)
==5190== by 0x40831DE: printf (printf.c:35)
==5190== by 0x4052112: (below main) (libc-start.c:226)
==5190==
==5190== Conditional jump or move depends on uninitialised value(s)
==5190== at 0x407CC10: vfprintf (vfprintf.c:1619)
==5190== by 0x40831DE: printf (printf.c:35)
==5190== by 0x4052112: (below main) (libc-start.c:226)
==5190==
==5190== Conditional jump or move depends on uninitialised value(s)
==5190== at 0x407C742: vfprintf (vfprintf.c:1619)
==5190== by 0x40831DE: printf (printf.c:35)
==5190== by 0x4052112: (below main) (libc-start.c:226)
==5190==
I am 0 years old.
I am 68882420 inches tall.
==5190==
==5190== HEAP SUMMARY:
==5190== in use at exit: 0 bytes in 0 blocks
==5190== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==5190==
==5190== All heap blocks were freed -- no leaks are possible
==5190==
==5190== For counts of detected and suppressed errors, rerun with: -v
==5190== Use --track-origins=yes to see where uninitialised values come from
==5190== ERROR SUMMARY: 22 errors from 4 contexts (suppressed: 11 from 6)
我在 VirtualBox VM 中使用的是 Ubuntu 11.10。
感谢任何帮助。
更新
看起来,如果我从 main()
调用一个函数并且该函数包含错误(例如未初始化的变量),那么我会获得一个跟踪到在 main()
中调用该函数的位置。然而,在 main()
中的错误仍未指定。请参见此粘贴板以获取示例。