C++ 尽管有 g 标志，Valgrind 不显示行号(在 Ubuntu 11.10VirtualBox 上)

发布于03月05日

我正在学习"艰苦学习C"，特别是the chapter on Valgrind.本章为您提供了一个故意错误的程序来展示Valgrind的工作原理.

当我在Valgrind下运行这个练习时，我不会在堆栈跟踪中获得行号，只是针对错误的"(在main下方)".

我是definitely岁，带着-g旗.

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)

我正在VirtualBox虚拟机中使用Ubuntu11.10.

谢谢你的帮助.

Update

似乎如果我从main()调用一个函数，而该函数包含错误(例如，一个未初始化的变量)，那么我do就会跟踪到main()中调用该函数的位置.但是，main()内的错误仍未指定.有关示例，请参见this paste.

==17673== Memcheck, a memory error detector ==17673== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al. ==17673== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info ==17673== Command: ./ex4 ... ==17673== Use of uninitialised value of size 4 ==17673== at 0x805CA7B: _itoa_word (in /home/user/ex4) ==17673== by 0x8049D5F: printf (in /home/user/ex4) ==17673== by 0x8048ECD: main (ex4.c:8) ==17673== Uninitialised value was created by a stack allocation ==17673== at 0x8048EFA: bad_function (ex4.c:17) ... ==17673== Use of uninitialised value of size 4 ==17673== at 0x805CA7B: _itoa_word (in /home/user/ex4) ==17673== by 0x8049D5F: printf (in /home/user/ex4) ==17673== by 0x80490BE: (below main) (in /home/user/ex4) ==17673== Uninitialised value was created by a stack allocation ==17673== at 0x8048EBE: main (ex4.c:4) ... I am -1094375076 years old. ... I am -1094369310 inches tall. ... ==17673== ==17673== HEAP SUMMARY: ==17673== in use at exit: 0 bytes in 0 blocks ==17673== total heap usage: 0 allocs, 0 frees, 0 bytes allocated ==17673== ==17673== All heap blocks were freed -- no leaks are possible ==17673== ==17673== For counts of detected and suppressed errors, rerun with: -v ==17673== ERROR SUMMARY: 83 errors from 21 contexts (suppressed: 0 from 0)

1 #include <stdio.h> 2 3 int main() 4 { 5 int age = 10; 6 int height; 7 8 bad_function(); 9 10 printf("I am %d years old.\n"); 11 printf("I am %d inches tall.\n", height); 12 13 return 0; 14 } 15 16 int bad_function() 17 { 18 int x; 19 printf("%d\n", x); 20 }

C++ 尽管有 g 标志，Valgrind 不显示行号(在 Ubuntu 11.10VirtualBox 上)

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