C语言undefined behaviour未定义行为 C语言中的未定义行为(Undefined Behavior)是指C语言标准未做规定的行为。同时,标准也从没要求编译器判断未定义行为,所以这些行为有编译器自行处理,在不同的编译器可能会产生不同的结果,又或者如果程序调用未定义的行为,可能会成功编译,甚至一开始运行时没有错误,只会在另一个系统...
The C language standard precisely specifies theobservable behaviorof C language programs, except for the ones in the following categories: undefined behavior- there are no restrictions on the behavior of the program. Examples of undefined behavior are memory accesses outside of array bounds, signed ...
off, len and datalen are all signed 32-bit integers. The result of (off + len) is undefined in C if the result overflows, which can cause the exception not to be thrown. This causes testsuite failures on 32-bit Linux PowerPC on Fedora 10. ...
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115160 --- Comment #2 from Ra'anan Lori <raanan.lori at getnexar dot com> --- it's sad to see this response, since the major issue here is that a user that wants to use the undefined behaviour sanitizer in such a case will not only...
[Bug c++/115160] Enabling undefined behaviour sanitizer causes or'ed bit shift to report wrong result jakub at gcc dot gnu.org via Gcc-bugsMon, 20 May 2024 10:56:29 -0700 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115160 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |...
Incppreferenceit is an undefined behaviour: If either dest or src is aninvalid or null pointer, the behavior is undefined, even if count is zero. Although there're no mention in creference about having src and count both zero, I assume it's also an undefined behaviour. Steps to Reproduce...
CsmithGCCLLVMMSVCEmpirical Software Engineering - Compiler fuzzing techniques require a means of generating programs that are free from undefined behaviour (UB) to reliably reveal miscompilation bugs. Existing...doi:10.1007/s10664-022-10146-1Even-Mendoza, Karine...
Undefined behaviour in ./include/linux/time64.h:127:27 signed integer overflow: 17179869187 * 1000000000 cannot be represented in type 'long long int' Call Trace: timespec64_to_ns include/linux/time64.h:127 [inline] set_cpu_itimer+0x65c/0x880 kernel/time/itimer.c:180 ...
编译的时候加上-fsanitize=undefined选项，就可以找出一些代码中存在的ub的地方，例如整数溢出、空指针解...
浮点数 - GongYong C 库函数 - printf()