Rewrite the macros so that they take a parameter. Consumers use it to signal
how much room in the buffer they need; this lets them do that once when
required space is known instead of doing the check once every loop step.
Also take the parameter value into consideration when resizing the buffer;
the requested space may be larger than the constant 400 bytes that the
previous version used - now it's the sum of those two values.
On the consumer side, don't copy strings byte by byte - use memcpy().
Deduplicate code that copied base 2, base 8 and base 16 literals.
Don't advance the e_token pointer once the token has been copied into
s_token. This allows easy calculation of the token's length.
The troff output in indent was invented at Sun and the online documentation
for some post-SunOS operating system includes this:
The usual way to get a troffed listing is with the command
indent -troff program.c | troff -mindent
The indent manual page in FreeBSD 1.0 already lacks that information and
troff -mindent complains about not being able to find the macro file.
It seems that the file did exist on SunOS and was supposed to be imported
into 4.3BSD together with the feature, but that has never happened.
Removal of troff output support simplifies a lot of indent's code.
vgrind(1) seems to be a promising replacement.
It was a shorthand for checking if ps.procname is a non-empty string; the
same can be done with ps.procname[0] which avoids the need for updating
is_procname after every call to lexi().
The trick is to copy everything from the start of the line into the buffer
that stores newlines and comments until indent finds a brace or an else.
pr_comment() will use that information to calculate the original indentation
of the boxed comment.
This requires storing two pieces of information: the real start of the
buffer (sc_buf) and the start of the comment (save_com).
lexi() reads the input stream and categorizes the next token. indent will
sometimes buffer up a sequence of tokens in order rearrange them. That is
needed for properly cuddling else or placing braces correctly according to
the chosen style (KNF vs Allman) when comments are around. The loop that
buffers tokens up uses lexi() to decide if it's time to stop buffering. Then
the temporary buffer is used to feed lexi() the same tokens again, this time
for normal processing.
The problem is that lexi() apart from recognizing the token, can change
a lot of information about the current state, for example ps.last_nl,
ps.keyword, buf_ptr. It also abandons leading whitespace, which is needed
mainly for comment-related considerations. So the call to lexi() while
tokens are buffered up and categorized can change the state before they're
read again for normal processing which may easily result in changing
interpretation of the current state and lead to incorrect output.
To work around the problems:
1) copy the whitespace into the save_com buffer so that it will be read
again when processed
2) trick lexi() into modifying a temporary copy of the parser state instead
of the original.
"while (...)" and "else" or "{"
* Don't flush newlines - there can be multiple of them and they can happen
before a token that isn't else or {. Instead, always store them in save_com.
* Don't dump the buffer's contents on newline assuming that there is only
one comment before else or {.
* Avoid producing surplus newlines, especially before else when -ce is on.
* When -bl is on, don't treat { as a comment (was implemented by falling
through "case lbrace:" to "case comment:").
This commit fixes the above, but exposes another bug and thus breaks several
other tests. Another commit will make them pass again.
In fixing issues with uid > INT_MAX, I broke the uid without username
case. The latter is more important so return the old state.
Discussed with: allanjude
One of the downsides of using numeric WARNS is that if we only have a
single type of issue we get no protection from other changes. For
example, we got no warning for missing variable declaration, due to
the issues with "const".
For this utility, explicitly list out the warnings which are failing.
They should still be fixed, so only reduce them to warning instead of
error.
Tested with: clang base (amd64, i386), gcc6, gcc7, gcc9, gcc base (mips)
Even though there do appear to be more artificial frames, with 12, stack
traces no longer list at all. Revert until a better, more stable value can
be determined.
- use bool instead of int [0]
- use calloc correctly [0]
(this also caught an incorrect sizeof argument) [1]
- use size_t over int [2]
- correct style
Reported by: pfg [0], scan-build [1], gcc [2]
Plenty of allocation sites pass M_ZERO and sizes which are small and known
at compilation time. Handling them internally in malloc loses this information
and results in avoidable calls to memset.
Instead, let the compiler take the advantage of it whenever possible.
Discussed with: jeff
- Prefer calloc over malloc. This is more predicable and we're not in a
performance sensitive context. [1]
- Remove bogus comment (obsolete from prior commit). [2]
- Remove void casts and type casts of NULL
- Remove redundant declaration of 'quit'
- Add additional const
Reported by: kib [1], vangyzen [2]
Summary: Included VSX registers in powerpc core dumps (both kernel and gcore)
Submitted by: Luis Pires
Differential Revision: https://reviews.freebsd.org/D15512
Currently all the primitives are waiting for a rewrite, tidy them up in the
meantime.
Vast majority of cases pass sizes which are multiple of 8. Which means the
following rep stosb/movb has nothing to do. Turns out testing first if there
is anything to do is a big win across the board (cpus with and without ERMS,
Intel and AMD) while not pessimizing the case where there is work to do.
Sample results for zeroing 64 bytes (ops/second):
Ryzen Threadripper 1950X 91433212 -> 147265741
Intel(R) Xeon(R) CPU X5675 @ 3.07GHz 90714044 -> 121992888
bzero and bcopy are on their way out and were not modified. Nothing in the
tree uses them.
Summary:
Added ptrace support for getting/setting the remaining part of the VSX registers
(the part that's not already covered by FPR or VR registers).
This is necessary to add support for VSX registers in debuggers.
Submitted by: Luis Pires
Differential Revision: https://reviews.freebsd.org/D15458
Some of the routines were using artificially limited builtin already,
drop the explicit limit.
The use of builtins allows quite often allows the compiler to elide the call
or most zeroing to begin with. For instance, if the target object is 32 bytes
in size and gets zeroed + has 16 bytes initialized, the compiler can just
add code to zero out the rest.
Note not all the primites have asm variants and some of the existing ones
are not optimized. Maintaines are strongly encourage to take a look
(regardless of this change).
1. Remove special-casing of 0 as it just results in an extra function call.
This is clearly pessimal.
2. Drop the inline stuff. For the most part it is much better served with
__builtin_memset (coming later).
3. Move the declaration to systm.h to match other funcs.
Archs are encouraged to implement the variant for their own platform so that
this implementation can be dropped.
without a RANDOM parameter but with a CHUNKS or HMAC-ALGO parameter.
Please note that sending this combination violates the specification.
Thnanks to Ronald E. Crane for reporting the issue for the userland
stack.
MFC after: 3 days
Allow to show only a single process specified by PID. This could
be done either by running top like 'top -p PID' or using the 'p' command
inside top.
Reviewed by: eadler
Approved by: eadler
Obtained from: OpenBSD
Differential Revision: https://reviews.freebsd.org/D15501
or 4 CPUs. Add a compile-time option SC_KERNEL_CONS_ATTRS to control the
defaults.
Default to color numbers in reverse order to CPU numbers (instead of
in the same order with white first and wrapping to dark grey), so that
the brightest bright colors are used first. Don't use dark grey at all;
replace it by dark green.
Syscons has too many compile-time options, but this one is needed in
in case the defaults give something like white on white, or the user
really hates this feature and can't wait to turn it off in rc.
MFC after: next release?
The per-CPU ts is not initialized early, so the global kernel ts is used
early, but it ony has 1 (normal) attribute. Switch this to the per-CPU
attribute.
The difference is most visible with EARLY_AP_STARTUP.
Change to using the curcpu macro instead of PCPU_GET(cpuid) in 2 places for
the above and in 1 other place in my old code in syscons. The function-like
spelling is perhaps better for indicating that curcpu is volatile (unlike
curthread), but for CPU attributes volatility is a feature.
The SCHEDULER_STOPPED() hack breaks locking generally, and
mtx_trylock_*() especially. When mtx_trylock_*() returns nonzero,
naive code version here trusts it to have worked. But when
SCHEDULER_STOPPED() is true, mtx_trylock_*() returns 1 without doing
anything. Then mtx_unlock_*() crashes especially badly attempting to
unlock iff the error is detected, since mutex unlocking functions don't
check SCHEDULER_STOPPED().
syscons already didn't trust mtx_trylock_spin(), but it was missing the
logic to turn on sp->kdb_locked when turning off sp->mtx_locked during
panics. It also used panicstr instead of SCHEDULER_LOCKED because I
thought that panicstr was more fragile. They only differ for a window
of lines in panic(), and in broken cases where stop_cpus_hard() in panic()
didn't work.
file in /sys/conf, so was unavailable in configurations that don't use
modules, and was not testable or notable in NOTES. Its normal
configuration (not using a module) is still silently deprecated in
aout(4) by not mentioning it there.
Update i386 NOTES for COMPAT_AOUT. It is not i386-only, or even very MD.
Sort its entry better.
Finish gzip configuration (but not support) for amd64. gzip is really
gzipped aout. It is currently broken even for i386 (a call to vm fails).
amd64 has always attempted to configure and test it, but it depends on
COMPAT_AOUT (as noted). The bug that it depends on unconfigured files
was not detected since it is configured as a device. All other optional
image activators are configured properly using an option.
