This commit moves the implementation of getopt into AK, and converts its
API to understand and use StringView instead of char*.
Everything else is caught in the crossfire of making
Option::accept_value() take a StringView instead of a char const*.
With this, we must now pass a Span<StringView> to ArgsParser::parse(),
applications using LibMain are unaffected, but anything not using that
or taking its own argc/argv has to construct a Vector<StringView> for
this method.
We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
This changes this:
```sh
profile -c "python3 -m test test_dict"
```
to this:
```sh
profile -- python3 -m test test_dict
```
This should be less confusing, hopefully!
Replacement conditions for `requires_argument` have been chosen based
on what would be most convenient for implementing an eventual optional
argument mode.
StringView was used where possible. Some utilities still use libc
functions which expect null-terminated strings, so String objects were
used there instead.
This allows tracing the syscalls made by a thread through the kernel's
performance event framework, which is similar in principle to strace.
Currently, this merely logs a stack backtrace to the current thread's
performance event buffer whenever a syscall is made, if profiling is
enabled. Future improvements could include tracing the arguments and
the return value, for example.
Hook the kernel page fault handler and capture page fault events when
the fault has a current thread attached in TLS. We capture the eip and
ebp so we can unwind the stack and locate which pieces of code are
generating the most page faults.
Co-authored-by: Gunnar Beutner <gbeutner@serenityos.org>
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
Often you want to enable and then disable profiling after a period of time.
To make this slightly more ergonomic, add an option to wait for user
input after enabling profiling, this will disable profiling on exit
after the key press.
