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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/TTY/PTYMultiplexer.cpp
View file

@ -14,7 +14,6 @@
namespace Kernel {
static const unsigned s_max_pty_pairs = 8;
static AK::Singleton<PTYMultiplexer> s_the;
PTYMultiplexer& PTYMultiplexer::the()
@ -25,8 +24,9 @@ PTYMultiplexer& PTYMultiplexer::the()
UNMAP_AFTER_INIT PTYMultiplexer::PTYMultiplexer()
: CharacterDevice(5, 2)
{
m_freelist.ensure_capacity(s_max_pty_pairs);
for (int i = s_max_pty_pairs; i > 0; --i)
constexpr unsigned max_pty_pairs = 8;
m_freelist.ensure_capacity(max_pty_pairs);
for (int i = max_pty_pairs; i > 0; --i)
m_freelist.unchecked_append(i - 1);
}