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Userland: static vs non-static constexpr variables

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Problem:
- `static` variables consume memory and sometimes are less
  optimizable.
- `static const` variables can be `constexpr`, usually.
- `static` function-local variables require an initialization check
  every time the function is run.

Solution:
- If a global `static` variable is only used in a single function then
  move it into the function and make it non-`static` and `constexpr`.
- Make all global `static` variables `constexpr` instead of `const`.
- Change function-local `static const[expr]` variables to be just
  `constexpr`.
This commit is contained in:
Lenny Maiorani 2021-05-19 09:32:07 -06:00 • committed by Linus Groh
parent 17ff895e1c
commit 800ea8ea96
38 changed files with 192 additions and 184 deletions
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35
Userland/Libraries/LibPthread/forward.cpp
View file

@ -6,25 +6,24 @@
#include <LibC/bits/pthread_forward.h>
static const PthreadFunctions s_functions = {
.pthread_mutex_trylock = pthread_mutex_trylock,
.pthread_mutex_destroy = pthread_mutex_destroy,
.pthread_mutexattr_init = pthread_mutexattr_init,
.pthread_mutexattr_settype = pthread_mutexattr_settype,
.pthread_mutexattr_destroy = pthread_mutexattr_destroy,
.pthread_once = pthread_once,
.pthread_cond_broadcast = pthread_cond_broadcast,
.pthread_cond_init = pthread_cond_init,
.pthread_cond_signal = pthread_cond_signal,
.pthread_cond_wait = pthread_cond_wait,
.pthread_cond_destroy = pthread_cond_destroy,
.pthread_cond_timedwait = pthread_cond_timedwait,
};
[[gnu::constructor]] static void forward_pthread_functions()
{
constexpr PthreadFunctions s_functions = {
.pthread_mutex_trylock = pthread_mutex_trylock,
.pthread_mutex_destroy = pthread_mutex_destroy,
.pthread_mutexattr_init = pthread_mutexattr_init,
.pthread_mutexattr_settype = pthread_mutexattr_settype,
.pthread_mutexattr_destroy = pthread_mutexattr_destroy,
.pthread_once = pthread_once,
.pthread_cond_broadcast = pthread_cond_broadcast,
.pthread_cond_init = pthread_cond_init,
.pthread_cond_signal = pthread_cond_signal,
.pthread_cond_wait = pthread_cond_wait,
.pthread_cond_destroy = pthread_cond_destroy,
.pthread_cond_timedwait = pthread_cond_timedwait,
};
__init_pthread_forward(s_functions);
}