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I am now going to Deep C

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I am now going to show you something cool!#include <stdio.h> $ cc foo.c && ./a.out 42void foo(void){ Nice! I love it! int a; printf("%dn", a); You now want me to explain about} execution stack or activation frames?void bar(void) I guess you have already demonstrated{ that you understand it. But what do you int a = 42; think might happen if we optimize this} code or use another compiler?int main(void){ A lot of things might happen when the optimizer kicks in. In bar(); this case I would guess that the call to bar() can be skipped as foo(); it does not have any side effects. Also, I would not be surprised} if the foo() is inlined in main(), ie no function call. (But since foo () has linker visibility the object code for the function must still be created just in case another object file wants to link with the function). Anyway, I suspect the value printed will be something else if you optimize the code.

Publicada em: Tecnologia
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