为什么 Valgrind 不喜欢我对 glutCreateWindow 的使用？
我正在使用以下代码...
169: const char *title = Title.c_str();
170: glutCreateWindow(title);
... Valgrind 给了我以下内容...
==28841== Conditional jump or move depends on uninitialised value(s)
==28841== at 0x6FF7A4C: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x6FF81F7: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x7289B36: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x728A757: _nv000133gl (in /usr/lib64/libGLcore.so.180.44)
==28841== by 0x4EAB9E9: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EAEA81: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EB1D81: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EA782B: glXCreateNewContext (in /usr/lib64/libGL.so.180.44)
==28841== by 0x54DF9AA: fgOpenWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x54DE062: fgCreateWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x54DF300: glutCreateWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x4146CE: vimrid::glut::GlutApplication::Init() (GlutApplication.cpp:170)
但是什么是未初始化的？ title 变量用 Title.c_str() 的值初始化，Title 是一个类成员，在构造函数成员初始化列表中初始化......
class VimridApplication
{
// ...
public:
std::string Title;
// ...
}
VimridApplication::VimridApplication() :
Title("Untitled VimridApplication")
{
// ...
}
class GlutApplication : public VimridApplication
{
// ...
}
I'm using the following code...
169: const char *title = Title.c_str();
170: glutCreateWindow(title);
... Valgrind gives me the following ...
==28841== Conditional jump or move depends on uninitialised value(s)
==28841== at 0x6FF7A4C: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x6FF81F7: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x7289B36: (within /usr/lib64/libGLcore.so.180.44)
==28841== by 0x728A757: _nv000133gl (in /usr/lib64/libGLcore.so.180.44)
==28841== by 0x4EAB9E9: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EAEA81: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EB1D81: (within /usr/lib64/libGL.so.180.44)
==28841== by 0x4EA782B: glXCreateNewContext (in /usr/lib64/libGL.so.180.44)
==28841== by 0x54DF9AA: fgOpenWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x54DE062: fgCreateWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x54DF300: glutCreateWindow (in /usr/lib64/libglut.so.3.8.0)
==28841== by 0x4146CE: vimrid::glut::GlutApplication::Init() (GlutApplication.cpp:170)
But what is uninitialized? The title variable is initialized with the value of Title.c_str() and Title is a class member which is initialized in the constructor member initialization list...
class VimridApplication
{
// ...
public:
std::string Title;
// ...
}
VimridApplication::VimridApplication() :
Title("Untitled VimridApplication")
{
// ...
}
class GlutApplication : public VimridApplication
{
// ...
}
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Valgrind 带有一些默认的错误抑制功能，但这可能不包括 libCLcore。
您可以创建您自己知道的错误抑制与您的代码无关。
Valgrind comes with some default error suppression, but that probably does not cover libCLcore.
You can create your own error suppressions that you know are irrelevant to your code.
忽略这一点即可； 正如您所看到的，未初始化的值在 OpenGL 库中的代码下方使用，并且可能不是您的未初始化的数据。 您可能想深入研究它（它可能仍然是误报），但您最好不要管它。
Just ignore this; as you can see, the uninitialized value is used way below your code in the OpenGL library, and it's probably not your data that's uninitialized. You might want to dig into it (it may still be a false positive), but you might as well leave it alone.