libc: suppress lint warning for namespacing mismatch for _mcount

This is the last remaining instance of lint warning 215, which is about
implicitly defined functions. Since C99, these implicit declarations
have not been allowed anymore.

Don't warn about frame pointer use for clang either.

branches: 1.14.6;
use the pico objects if we are making a PIC profiled library.

branches: 1.13.2; 1.13.4;
copy the i386 workaround for amd64.

fixes for GCC 6:

- -Wstrict-prototypes is not available for C++, so don't try to
ignore it for C++.
- remove many _DIAGASSERT() checks against not NULL for functions
with arguments with nonnull attributes. in two cases, leave
code behind that should set defaults to "(null)".
- use -Wno-error=frame-address for i386 mcount, as it seems valid
to assume the caller will have a frame.fair

Use --no-warn only with GCC on MIPS.

Instead of testing for all mips variants, just use MACHINE_CPU.

branches: 1.9.2;
don't warn about mcount on mips64* as well.

XXX: someone really should fix mips profile.h's MCOUNT!

branches: 1.8.6; 1.8.12;
Disable assembler warnings on mipseb and mipsel for mcount.c
Workaround for PR#39192

branches: 1.7.26;
Make gmon / mcount work properly for threaded applications by keeping
thread-specific gmonparam structures and then merging them before dumping
the profile buffers.

Written by Nathan J. Williams, contributed by Wasabi Systems, Inc.

branches: 1.6.4;
We reference a monstartup(3), so let's actually make a link for it.

branches: 1.5.2;
Move the Alpha _mcount() into a .S file so that it can be
pre-processed, like other Alpha assembly files.

clean up Ids

specify man pages the new way.

rcsids. also, avoid floating point when picking scale value. doesn't
cost much, only done once.

branches: 1.1.1;
Initial revision

PR lib/56395
PR toolchain/56771

Fix profiling on CPUs that do not support unaligned memory access;
Allocate objects (referenced from struct gmonparam) with proper
alignments.

For monstartup(), objects are allocated on heap. Break is not
guaranteed to be aligned at all, unlike stack pointer.

For _m_gmon_alloc(), objects are allocated on anonymous memory.
p->tos is not aligned properly in general.

This fixes quasi-random crashes for *_profile tests, at least on
SH-4 and PowerPC 403 [1]. Also, no regression is observed for
others as far as I can see.

This change does not cause any ABI breakage, as long as application
uses proper pointers; use p->tos instead of evil pointer arithmetic
like (struct tostruct *)((char *)p->froms + p->fromssize) [2].

[1] Timeout should be increased for some tests. "pic" variants
still fail as expected. Dynamically-linked binaries also crash in
rtld for SH-4, but this seems different problem...

[2] This example did not work even before, since the order of
froms[] and tos[] is reversed depending on which of monstartup() or
_m_gmon_alloc() is used for allocation.

PR/56246: Yuichiro Naito: gprof(1) never show call graphs when profiling
multi-threaded application

make more descriptors that we open as close-on-exec

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

branches: 1.33.6;
Fix fdleak in #ifdef DEBUG. Found by cppcheck.

- KNF
- fix hertz()
- fix error and warning messages

Close log file handle after using it. Found by cppcheck.

sign-compare fixes

branches: 1.29.28;
fix incomplete initializers

don't include <sys/param.h> twice.

use rownddown/rowndup in sys/param.h instead of their now-deleted UC equivs
formerly in sys/gmon.h.

in _m_gmon_destructor(0 when traversing the list, add (void *) to the cast
chain.

fix debugging printf formats.

fix compilation with -DDEBUG

WARNS=4

Make gmon / mcount work properly for threaded applications by keeping
thread-specific gmonparam structures and then merging them before dumping
the profile buffers.

Written by Nathan J. Williams, contributed by Wasabi Systems, Inc.

branches: 1.21.2;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Use snprintf instead of hand crafted string copy and numeric conversion.
Avoids problems if/when the pid is greater than 999999.
(approved by christos)

Fix signed/unsigned comparison warnings.

disable profiling set{u,g}id binaries.

branches: 1.17.2;
convert from __progname to getprogname()

fix nested extern
fix sbrk casts

branches: 1.15.10;
* On architectures using ELF, and conditionally on those in transition, rename
_ASM_LABEL(cerror) and _ASM_LABEL(curbrk) to _C_LABEL(__cerror) and
_C_LABEL(__curbrk) (or their respective architecture-specific equivalents) to
avoid possible name clashes with identifiers used in user applications.
* Do the same for minbrk on all architectures to avoid a GCC-specific (and
on ELF architectures effectively useless) symbol reference renaming in MI code.

delint

bzero->memset, bcopy->memcpy, bcmp->memcmp

Prefer STDERR_FILENO over 2.

remove obsolete register declarations

Fix RCSID's
Use warn instead of perror()
Use "namespace.h"
Add missing prototypes

be safe with buffers. KNF.

- convert unsafe strcpy(), strcat() and sprintf() to the `n' versions.
- some KNF.

use __inline and __asm, rather than inline and asm. By default (without -g)
lint won't accept the latter two, but will accept the former two as valid.
As far as gcc's concerned, they're the same.

branches: 1.6.2;
use p->hashfraction when doing non-time-critical calculations, rather than
using HASHFRACTION directly. in time-critical calculations, if HASHFRACTION
is a power of two, check that p->hashfraction == HASHFRACTION and if so do
the calculation with the compiled-in value so that the compiler can optimize
out (potentially) expensive divisions. if p->hashfraction != HASHFRACTION,
actually do the division. This has the result that on machines with slow
division, the division can be optimized out of the common case, but that
if HASHFRACTION changes from the compiled-in value (for whatever reason),
profiling will still work. Changes suggested by Chris Torek.

branches: 1.5.4;
Add support for PROFDIR environment variable

kill a gratuitous cast of lowpc to an int

clean up Ids

branches: 1.2.4;
rcsids. also, avoid floating point when picking scale value. doesn't
cost much, only done once.

branches: 1.1.1;
Initial revision

Use reach-over sources from common/lib/libc

The __used__ change doesn't work on 2.95/vax. Put an #ifdef back in for vax and
reverted it to __unused__ as it was before

Remove unused, -- just used is enough. From uwe.

Add a __used__ attribute next to the __unused__ attribute, because we don't
want the optimizer to get rid of the whole code erroneously (which happens
with -O6 on sparc64).

Make gmon / mcount work properly for threaded applications by keeping
thread-specific gmonparam structures and then merging them before dumping
the profile buffers.

Written by Nathan J. Williams, contributed by Wasabi Systems, Inc.

branches: 1.13.2;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Move the Alpha _mcount() into a .S file so that it can be
pre-processed, like other Alpha assembly files.

delint

don't actually compile any code if building in a _STANDALONE environment
(e.g. libkern for boot blocks), since profiling support doesn't make
sense there.

remove obsolete register declarations

Fix RCSID's
Add unused attribute to _mcount, since it might be called from assembly.

prototype mcount (or, whatever function is declared by _MCOUNT_DECL;
typically mcount()) before it is defined or used.

Copy over from libkern:
> Prevent recursive invocation of mcount() while in kernel by setting profiling
> state to BUSY while in mcount(). This allows profiling to work when mcount()
> calls a profiled routine (for example, udiv on the SPARC).

use p->hashfraction when doing non-time-critical calculations, rather than
using HASHFRACTION directly. in time-critical calculations, if HASHFRACTION
is a power of two, check that p->hashfraction == HASHFRACTION and if so do
the calculation with the compiled-in value so that the compiler can optimize
out (potentially) expensive divisions. if p->hashfraction != HASHFRACTION,
actually do the division. This has the result that on machines with slow
division, the division can be optimized out of the common case, but that
if HASHFRACTION changes from the compiled-in value (for whatever reason),
profiling will still work. Changes suggested by Chris Torek.

s/KERNEL/_KERNEL/ to match libkern version.

branches: 1.3.6;
clean up Ids

rcsids. also, avoid floating point when picking scale value. doesn't
cost much, only done once.

branches: 1.1.1;
Initial revision

Fix markup.

branches: 1.9.42;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

New sentence, new line. Correct punctuation. Use more markup.

Remove some boring whitespace, sort sections.

branches: 1.6.2;
Document the PROFDIR environment variable.

Last of the .Os cleanups. .Os is defined in the tmac.doc-common file,
so we shouldn't override it with versions in the manpages. Wheee!

add LIBRARY section to man page

clean up Ids

rcsids. also, avoid floating point when picking scale value. doesn't
cost much, only done once.

branches: 1.1.1;
Initial revision