c++ - basic_string.tcc 中的核心转储 - 优化了

Question

偶尔我会遇到一些核心转储，但我无法弄清楚它们为什么会发生。通常在将 av 值分配给字符串时会发生这种情况。下面是其中一个案例的回溯。核心转储似乎是由我的 C++ 代码中的这一行引起的:

m_strValue = "---";

我无法弄清楚在这种情况下发生了什么，我回家有人可以阐明这个问题。

下面是回溯

#0  0x40227ed4 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:67
#1  0x402293d0 in *__GI_abort () at abort.c:92
#2  0x4011a594 in __gnu_cxx::__verbose_terminate_handler () at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3/libstdc++-v3/libsupc++/vterminate.cc:93
#3  0x40118770 in __cxxabiv1::__terminate (handler=<optimized out>) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3/libstdc++-v3/libsupc++/eh_terminate.cc:39
#4  0x40118798 in std::terminate () at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3/libstdc++-v3/libsupc++/eh_terminate.cc:49
#5  0x40118914 in __cxxabiv1::__cxa_throw (obj=<optimized out>, tinfo=<optimized out>, dest=<optimized out>) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3/libstdc++-v3/libsupc++/eh_throw.cc:83
#6  0x400c8de8 in std::__throw_length_error (__s=<optimized out>) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3/libstdc++-v3/src/functexcept.cc:74
#7  0x400fe02c in std::string::_Rep::_S_create (__capacity=4294967293, __old_capacity=<optimized out>, __alloc=<optimized out>) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3-stage3/armv5l-linux-gnueabi/libstdc++-v3/include/bits/basic_string.tcc:552
#8  0x400fe260 in std::string::_M_mutate (this=0x7d3d78, __pos=0, __len1=9, __len2=3) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3-stage3/armv5l-linux-gnueabi/libstdc++-v3/include/bits/basic_string.tcc:479
#9  0x400fe3fc in std::string::_M_replace_safe (this=0x7d3d78, __pos1=0, __n1=<optimized out>, __s=0x62d708 "---", __n2=3) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3-stage3/armv5l-linux-gnueabi/libstdc++-v3/include/bits/basic_string.tcc:684
#10 0x400fe48c in std::string::assign (this=0x7d3d78, __s=<optimized out>, __n=3) at /home/habbjack/ssd/workspace/builder2/build_armv5l-linux-gnueabi/gcc-4.5.3/gcc-4.5.3-stage3/armv5l-linux-gnueabi/libstdc++-v3/include/bits/basic_string.tcc:264
#11 0x0026175c in CLCD_Wnd::Refresh (this=0x7d3d60) at ../../lib/src/HAL/LCD/CLCD_Wnd.cpp:49

Answer 1

第 7 行显示了 capacity=4294967293 的创建，紧接着是 throw_length_error。

另外，第 11 行的对象距离字符串只有 24 个字节，如果 CLCD_Wnd 需要比这更多的空间，这可能表明存在某种分配问题。