I think you would be pleased to see the current parser implementation.
The parsing table is transposed, so that each part of speech indicates
which lines of the parse table it matches. This fits into 8 bits, so
the information for the 4 columns of the parse table fit into a single
32-bit word, which is what is stored on the stack.
The search through the parsing table, formerly a time-consuming loop, is
now performed in a single C expression which expands to 13 machine
instructions with no branches.
Henry Rich
On 3/9/2019 7:55 PM, Roger Hui wrote:
It is unusual to make assignment an array with an internal datatype. But
it was all driven by the needs of the parser (see Dictionary, Section
II.E), and the J interpreter is built around the parser.
See file t.c, and search for ASGN, CASGN, and CGASGN. (The latter two in
the value parts, instead of the 0 and 1 that I said.)
On Sat, Mar 9, 2019 at 4:10 PM Henry Rich <henryhr...@gmail.com> wrote:
I never knew that. I was relying on the ID byte.
I now use upper flag bits of the type to distinguish ASGN as
private/public, and to-name/to-noun.
I needed to distinguish named private assignments in explicit
definitions, because I preallocate symbols for them in a symbol table
that I also preallocate, and point each reference to them to the
preallocated symbol to avoid the name search during execution.
Henry Rich
On 3/9/2019 6:59 PM, Roger Hui wrote:
ASGN is an internal type; in the value part (the ravel) of a scalar with
that type, there is a 0 or 1, indicating whether is local assignment (=.)
or global assignment (=:).
On Sat, Mar 9, 2019 at 2:52 PM Henry Rich <henryhr...@gmail.com> wrote:
Aaaghh, you caught me. That was one of the first changes I made when I
was learning the J Engine. I knew it would print wrong, but I didn't
know how to make it right, and I hoped no one would ever notice.
I guess I have to go back and fix it, but I understand the system better
now, so maybe I can figure out how to do it properly.
Henry Rich
On 3/9/2019 2:05 PM, Joey K Tuttle wrote:
jkt@set1:~$ /usr/local/lib/j64-801/bin/jconsole
JVERSION
Engine: j701/2011-01-10/11:25
Library: 8.01.028
Platform: Linux 64
Installer: j801 install
InstallPath: /usr/local/lib/j64-801
+a=.'huh'
|domain error
| +a=.'huh'
exit 0
jkt@set1:~$ ja
JVERSION
Engine: j807/j64nonavx/linux
Release-c: commercial/2019-02-24T10:44:44
Library: 8.07.22
Platform: Linux 64
Installer: J807 install
InstallPath: /usr/local/lib/j64-807
Contact: www.jsoftware.com
+a=.'huh'
|domain error
| +a=:'huh'
NB. Curious -- why is =. changed to =: for error reports in recent
versions?
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