Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add a missing prototype

PR: 145232
Submitted by: gcooper
MFC after: 1 week

Update to FICL 3.03 (the last release before FICL4 rewrite).

The relevant changes for FreeBSD (excerpt from the release note):

* Newly implemented CORE EXT words: CASE, OF, ENDOF, and ENDCASE. Also
added FALLTHROUGH, which works like ENDOF but jumps to the instruction
just after the next OF.
* Bugfix: John-Hopkins locals syntax now accepts | and -- in the comment
(between the first -- and the }.)
* Bugfix: Changed vmGetWord0() to make Purify happier. The resulting
code is no slower, no larger, and slightly more robust.

Instead of just not defining a bunch of words when TESTMAIN is set, provide
stubs that at least handle the stack correctly. This makes it much easier to
experiment with loader scripts from userland.

Upgrade to FICL version 3.02. Anything wrong is my fault, everything right is
due Jon Mini.

PR: 36308
Submitted by: Jon Mini <mini@haikugeek.com>
MFC after: 4 weeks

Turn dictthreshold and dictincrease into cell-sized variables, so
they can be used with cell operators like !.

As I did this, I noticed the whole CELL thing might have problems with
big endian architectures with sizeof(int)!=sizeof(void*).

Bring in ficl 2.05.

This version has a step debugger, which now completely replaces the
old trace feature. Also, we moved all of the FreeBSD-specific MI
code to loader.c, reducing the diff between this and the official
FICL distribution.

Add the infrastructure necessary to handle PnP from a Forth script.

Also, export the file_findfile() function. Again, this is taken from
work in progress but frozen for the time being. Since it works, I'd
rather commit and remove any uglyness later than hide it on my tree.

Add setenv, getenv, setenv?, unsetenv, copyin and copyout to FICL.

Apply a number of fixes for the Alpha platform.

Add "int" sized manipulation words.

Bring in FICL 2.04. No bump of loader version is required by this
commit.

Lay the groundwork for on-demand dictionary expansion.

Implement a machine-independent (word size-independent) FICL_TRUE.

Bring in ficl version 2.03. No version bump for loader.

Remove dictHashSummary internal function; it used doubles.

Submitted by: Daniel C. Sobral <dcs@newsguy.com>

From the PR:

I added a FICL_TRACE-conditioned trace facility based on "see".
It is ugly because words' functions are almost all static, and ficlExec,
where the trace has to be located, can't get their pointers. So, #ifdef
this staticization, and add most of see's body into ficlExec. Duplication
of code, uglyness, etc. But it is cleanly #ifdef'ed, and works like a
charm.

It does not provide "step" facility, though, just trace. It is
tunable at run-time through "trace!". If anyone (most likely me :) ever
wants a step facility, I'll add it. Should be easy.

PR: bin/9652
Submitted by: "Daniel C. Sobral" <dcs@newsguy.com>

Add EXCEPTION word set.

Make TIB handling use buffer size to conform with ANS Forth.

Add ANS MEMORY-ALLOC word set.

See the PRs for extensive details.

PR: kern/9412 kern/9442 kern/9514
Submitted by: PRs from Daniel Sobral <dcs@newsguy.com>

Change counter-intuitive pc@ and pc! to inb and outb.

Submitted by: jkh

Add words "pc!" and "pc@" which allow to manipulate I/O ports. This can
be helpful when directly fiddling with PC hardware.

Also, define "arch-i386" appropriately, as suggested by Daniel C. Sobral.

Eliminate much code cruft by extending simple file I/O API to include
fopen and fclose.

Submit better fix to the prompt bug.

Don't not print the prompt string; not doing this has funny side-effects.
Make the prompt an empty string instead.

Add the Ficl (Forth Inspired Command Language) interpreter. If all goes well,
this will allow us to manage bloat in the loader by using a bytecoded HLL
rather than lots of C code. It also offers an opportunity for vendors
or others with special applications to significantly customise the boot
process without having to commit to a divergent code branch.

This early commit is to allow others to experiment with the most effective
mechanisms for integrating FICL with the loader as it currently stands.

Ficl is distributed with the following license conditions:

"Ficl is freeware. Use it in any way that you like, with the understanding
that the code is not supported."

All source files contain authorship attributions.

Obtained from: John Sadler (john_sadler@alum.mit.edu)