Limit --对您自己的代码执行memcheck

Question

假设我使用的是一个使用glibc的库。当我通过Valgrind运行程序时退出程序时，Valgrind会检测到所有类型的内存泄漏。我百分之百地确定，没有一个泄漏与我刚刚编写的几行代码明确相关。有没有一种方法可以抑制其他库的泄漏，并将泄漏检测限制在您的即时代码上？

例如：

valgrind --tool=memcheck --leak-check=full --leak-resolution=high \
    --log-file=vgdump ./Main

其中可执行文件是从以下来源构建的：

// Include header files for application components.
#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget window;
    window.resize( 320,240 );
    window.setWindowTitle(
        QApplication::translate( "toplevel", "Top-level Widget" ) );
    window.show( );

    QPushButton button(                   
        QApplication::translate( "childwidget", "Press me"), &window );
    button.move( 100, 100 );
    button.show( );
    int status = app.exec();
    return status;
}

有一个日志文件，其中报告了以下内容(删除了大部分内容)：

   ==12803== Memcheck, a memory error detector
   ==12803== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
   ==12803== Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyright info
   ==12803== Command: ./Main
   ==12803== Parent PID: 12700
   ==12803==
   ==12803==
   ==12803== HEAP SUMMARY:
   ==12803==     in use at exit: 937,411 bytes in 8,741 blocks
   ==12803==   total heap usage: 38,227 allocs, 29,486 frees, 5,237,254 bytes allocated
   ==12803==
   ==12803== 1 bytes in 1 blocks are possibly lost in loss record 1 of 4,557
   ==12803==    at 0x402577E: malloc (vg_replace_malloc.c:195)
   ==12803==    by 0xA1DFA4: g_malloc (in /lib/libglib-2.0.so.0.2600.0)
   ==12803==    by 0xA37F29: g_strdup (in /lib/libglib-2.0.so.0.2600.0)
   ==12803==    by 0xB2A6FA: g_param_spec_string (in /lib/libgobject-2.0.so.0.2600.0)
   ==12803==    by 0x41F36473: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
   ==12803==    by 0xB3D237: g_type_class_ref (in /lib/libgobject-2.0.so.0.2600.0)
   ==12803==    by 0xB20B38: g_object_newv (in /lib/libgobject-2.0.so.0.2600.0)
   ==12803==    by 0xB212EF: g_object_new (in /lib/libgobject-2.0.so.0.2600.0)
   ==12803==    by 0x41F34857: gtk_settings_get_for_screen (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
   ==12803==    by 0x41ED0CB6: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
   ==12803==    by 0xB377C7: g_cclosure_marshal_VOID__OBJECT (in /lib/libgobject-2.0.so.0.2600.0)
   ==12803==    by 0xB1ABE2: g_closure_invoke (in /lib/libgobject-2.0.so.0.2600.0)
    ...

    ==12803== 53,244 bytes in 29 blocks are possibly lost in loss record 4,557 of 4,557
    ==12803==    at 0x402577E: malloc (vg_replace_malloc.c:195)
    ==12803==    by 0xA1DFA4: g_malloc (in /lib/libglib-2.0.so.0.2600.0)
    ==12803==    by 0xA36050: g_slice_alloc (in /lib/libglib-2.0.so.0.2600.0)
    ==12803==    by 0xA36315: g_slice_alloc0 (in /lib/libglib-2.0.so.0.2600.0)
    ==12803==    by 0xB40077: g_type_create_instance (in /lib/libgobject-2.0.so.0.2600.0)
    ==12803==    by 0xB1CE35: ??? (in /lib/libgobject-2.0.so.0.2600.0)
    ==12803==    by 0xB205C6: g_object_newv (in /lib/libgobject-2.0.so.0.2600.0)
    ==12803==    by 0xB212EF: g_object_new (in /lib/libgobject-2.0.so.0.2600.0)
    ==12803==    by 0x6180FA3: ??? (in /usr/lib/gtk-2.0/2.10.0/engines/libclearlooks.so)
    ==12803==    by 0x41F0CDDD: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
    ==12803==    by 0x41F11C24: gtk_rc_get_style (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
    ==12803==    by 0x4200A81F: ??? (in /usr/lib/libgtk-x11-2.0.so.0.2200.0)
    ==12803==
    ==12803== LEAK SUMMARY:
    ==12803==    definitely lost: 2,296 bytes in 8 blocks
    ==12803==    indirectly lost: 7,720 bytes in 382 blocks
    ==12803==      possibly lost: 509,894 bytes in 2,908 blocks
    ==12803==    still reachable: 417,501 bytes in 5,443 blocks
    ==12803==         suppressed: 0 bytes in 0 blocks
    ==12803== Reachable blocks (those to which a pointer was found) are not shown.
    ==12803== To see them, rerun with: --leak-check=full --show-reachable=yes
    ==12803==
    ==12803== For counts of detected and suppressed errors, rerun with: -v
    ==12803== ERROR SUMMARY: 1364 errors from 1364 contexts (suppressed: 122 from 11)

Answer 1

要忽略任何lib目录(/lib、/lib64、/usr/lib、/usr/lib64等)下的所有共享库中的泄漏错误，请将此代码放入一个文件中，并使用--suppressions=*FILENAME*将其传递给valgrind

{
   ignore_unversioned_libs
   Memcheck:Leak
   ...
   obj:*/lib*/lib*.so
}
{
   ignore_versioned_libs
   Memcheck:Leak
   ...
   obj:*/lib*/lib*.so.*
}

这可能足以将memcheck报告仅限于您自己的代码。但是，要注意，这将忽略由库调用的任何回调所导致的错误。在这些回调中捕获错误几乎可以用以下方法完成：

{
   ignore_unversioned_libs
   Memcheck:Leak
   obj:*/lib*/lib*.so
   ...
   obj:*/lib*/lib*.so
}
{
   ignore_versioned_libs
   Memcheck:Leak
   obj:*/lib*/lib*.so.*
   ...
   obj:*/lib*/lib*.so.*
}

..。但这揭示了使用Valgrind malloc的库调用中的错误。由于valgrind malloc是直接注入到程序文本中的--而不是作为动态库加载的--它在堆栈中的显示方式与您自己的代码相同。这允许Valgrind跟踪分配，但也使它更难准确地执行您所要求的操作。

仅供参考:我使用的是valgrind 3.5。

上面是对这个问题正文中提出的一个较旧的、略有不同的问题的答案的摘录(因此标题有点不足)：

• Is it possible to make valgrind ignore certain libraries?

Answer 2

在Valgrind网站上查找suppressions主题；您希望抑制来自第三方库的错误。