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Add support for static_assert

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Add C11's _Static_assert and static_assert macro.

This is like #error, but is handled at a later stage
of translation, so it is possible to check sizes of
types, values of enums, etc.

https://en.cppreference.com/w/c/language/_Static_assert
https://port70.net/~nsz/c/c11/n1570.html#6.7.10
This commit is contained in:
Jesse Rosenstock
2020-07-26 22:16:47 +02:00
committed by Oliver Schmidt
parent c72fa735b9
commit 3df6c383c0
10 changed files with 274 additions and 0 deletions
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70
test/val/staticassert.c Normal file
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/*
Copyright 2020 Google LLC
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
/*
** Tests of passing _Static_asserts.
**/
#include <assert.h>
_Static_assert (1, "1 should be true.");
_Static_assert (!0, "!0 should be true.");
_Static_assert (1 == 1, "1 == 1 should be true.");
_Static_assert (1 == 1L, "1 == 1L should be true.");
_Static_assert (1 != 0, "1 != 0 should be true.");
_Static_assert (sizeof (char) == 1, "sizeof (char) should be 1.");
_Static_assert (sizeof (int) == 2, "sizeof (int) should be 2.");
/* Make sure we can also do structs. */
struct sc { char a; };
_Static_assert (sizeof (struct sc) == 1, "sizeof (struct sc) should be 1.");
struct si { int a; };
_Static_assert (sizeof (struct si) == 2, "sizeof (struct si) should be 2.");
/* Try enums. */
enum { k = 1 };
_Static_assert (k == 1, "k should be 1.");
/* Just test the macro version once. */
static_assert (1, "1 should be true.");
/* _Static_assert can appear anywhere a declaration can. */
void f (void)
{
_Static_assert (1, "1 should still be true.");
if (1) {
_Static_assert (1, "1 should still be true.");
}
}
/* _Static_assert can also appear in structs. */
struct S {
int a;
_Static_assert (1, "1 should still be true.");
int b;
};
int main (void)
{
return 0;
}