[英]Stopping the debugger when a NaN floating point number is produced without a code change
I read this and this . 我读到这个和这个 。 The quintessence is that one can throw a SIGFPE if a nan is produced by including fenv.h and enabling all floating point exceptions but
FE_INEXACT
by feenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT);
精髓是,如果一个南由包括fenv.h并启用所有浮点异常,但所产生的一个可以抛出SIGFPE
FE_INEXACT
通过feenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT);
Thus, the code changes form 因此,代码改变了形式
int main () {
double dirty = 0.0;
double nanvalue = 0.0/dirty;
return 0;
}
to 至
#include <fenv.h>
int main () {
feenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT); // Enable all floating point exceptions but FE_INEXACT
double dirty = 0.0;
double nanvalue = 0.0/dirty;
return 0;
}
This works fine, but you have to change the code. 这工作正常,但您必须更改代码。 I have the problem, that in a huge c and c++ code base, somewhere a nan is produced and I don't know where.
我有问题,在一个巨大的c和c ++代码库中,某个地方生成了一个nan,我不知道在哪里。 It is not an option to apply the above change to hunderts of files and track the error.
将上述更改应用于文件的hunderts并跟踪错误不是一种选择。
Is there a way to enable the all floating point exceptions, WITHOUT a code change? 有没有办法在没有代码更改的情况下启用所有浮点异常? Is there a compile option I am not aware of?
有没有我不知道的编译选项?
We use the intel icc version 15.0.3 compiler. 我们使用intel icc 15.0.3版编译器。
No matter how many files your code spans, you only need to add feenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT)
once only, at the first line of your main()
function. 无论你的代码有多少文件跨越,你只需要添加
feenableexcept(FE_ALL_EXCEPT & ~FE_INEXACT)
只有一次 ,你的第一行main()
函数。
It will enable the exceptions for your whole program until you disable the exceptions by calling another function such as fedisableexcept()
. 它将启用整个程序的异常,直到通过调用另一个函数(如
fedisableexcept()
禁用异常。
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