valgrind - 将 --memcheck 限制为您自己的代码

Question

假设我正在使用一个使用 glibc 的库。当我在通过 Valgrind 运行程序时退出程序时，Valgrind 会检测到各种内存泄漏。我 100% 确定没有任何泄漏与我刚刚编写的几行代码明确相关。有没有办法抑制其他库的泄漏，并将泄漏检测限制在您的直接代码中？

例如:

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

可执行文件是从以下源构建的:

// 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，报告以下内容(删除了大部分):

   ==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

忽略任何 lib 目录(/lib、/lib64、/usr/lib、/usr/lib64、...)，将其放入文件中并使用 将其传递给 valgrind --suppressions=*FILENAME*:

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

这可能足以限制 memcheck 仅向您自己的代码报告。但是，请注意，这将忽略由您编写的库调用的任何回调引起的错误。捕获这些回调中的错误几乎可以通过以下方式完成:

{
   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 直接注入(inject)到程序文本中(而不是作为动态库加载)，因此它在堆栈中的显示方式与您自己的代码相同。这使得 Valgrind 能够跟踪分配情况，但也使得准确执行您所要求的操作变得更加困难。

仅供引用:我正在使用 valgrind 3.5。

上面是对这个问题的正文中提出的一个稍有不同的旧问题的回答摘录(因此标题有点不够):

• Is it possible to make valgrind ignore certain libraries?