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Kernel: 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 08:35:09 -06:00 • committed by Linus Groh
parent 2b64d163cd
commit 5751327195
15 changed files with 30 additions and 37 deletions
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6
Kernel/Devices/HID/HIDManagement.cpp
View file

@ -16,7 +16,7 @@ Atomic<bool> g_caps_lock_remapped_to_ctrl;
static AK::Singleton<HIDManagement> s_the;
// clang-format off
static const Keyboard::CharacterMapData DEFAULT_CHARACTER_MAP =
static constexpr Keyboard::CharacterMapData DEFAULT_CHARACTER_MAP =
{
.map = {
0, '\033', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0x08,
@ -74,10 +74,6 @@ static const Keyboard::CharacterMapData DEFAULT_CHARACTER_MAP =
};
// clang-format on
KeyboardClient::~KeyboardClient()
{
}
size_t HIDManagement::generate_minor_device_number_for_mouse()
{
// FIXME: Lock this to prevent race conditions with hot-plugging devices!