问题描述

我有一段代码如下:

TAxis *axis = 0;
if (dynamic_cast<MonitorObjectH1C*>(obj))
   axis = (dynamic_cast<MonitorObjectH1C*>(obj))->GetXaxis();

有时会崩溃:

Thread 1 (Thread -1208658240 (LWP 11400)):
#0  0x0019e7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x048c67fb in __waitpid_nocancel () from /lib/tls/libc.so.6
#2  0x04870649 in do_system () from /lib/tls/libc.so.6
#3  0x048709c1 in system () from /lib/tls/libc.so.6
#4  0x001848bd in system () from /lib/tls/libpthread.so.0
#5  0x0117a5bb in TUnixSystem::Exec () from /opt/root/lib/libCore.so.5.21
#6  0x01180045 in TUnixSystem::StackTrace () from /opt/root/lib/libCore.so.5.21
#7  0x0117cc8a in TUnixSystem::DispatchSignals ()
   from /opt/root/lib/libCore.so.5.21
#8  0x0117cd18 in SigHandler () from /opt/root/lib/libCore.so.5.21
#9  0x0117bf5d in sighandler () from /opt/root/lib/libCore.so.5.21
#10 <signal handler called>
#11 0x0533ddf4 in __dynamic_cast () from /usr/lib/libstdc++.so.6

我不知道它为什么会崩溃.obj 不为空(如果是这样就没有问题，是吗?).

I have no clue why it crashes. obj is not null (and if it was it would not be a problem, would it ?).

动态转换崩溃的原因可能是什么?

What could be the reason for a dynamic cast to crash ?

如果它不能强制转换，它应该只返回 NULL 否?

If it can't cast, it should just return NULL no ?

推荐答案

崩溃的一些可能原因:

• obj 指向具有非多态类型的对象(没有虚拟方法的类或结构，或基本类型).
• obj 指向一个已经被释放的对象.
• obj 指向未映射的内存，或已映射的内存以在访问时产生异常的方式(例如保护页或不可访问的页).
• obj 指向具有多态类型的对象，但该类型是在禁用 RTTI 的情况下编译的外部库中定义的.

• obj points to an object with a non-polymorphic type (a class or struct with no virtual methods, or a fundamental type).
• obj points to an object that has been freed.
• obj points to unmapped memory, or memory that has been mapped in such a way as to generate an exception when accessed (such as a guard page or inaccessible page).
• obj points to an object with a polymorphic type, but that type was defined in an external library that was compiled with RTTI disabled.

并非所有这些问题都会在所有情况下导致崩溃.

Not all of these problems necessarily cause a crash in all situations.

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