I'm in the process of converting BASIC over to use this new assembler...
and have hit a few snags. I'm happy to patch, but don't know if this is
the Right Thing or not.
At 12:39 AM 6/1/2002 -0400, you wrote:
>Support for keyed parameters now exists. I need to change the name of
>the 'set_keyed' and 'get_keyed' operator to just 'set', since they
>should be relatively unambiguous. Anyway, here's the new syntax
>available at the assembly level:
Looks great. Converted over with little sweat, noted below.
>The next feature which Clinton used in his BASIC compiler but had to do
>by hand is a manifest constant. You can use the following syntax to
>define an assemble-time constant:
>
>..constant PerlHash 6 # Important, because the special names 'PerlHash'
This should actually be:
..constant PerlHash 6
Right?
I was doing a simple X for Y transformation using a pattern like this:
^.const\s+(\w+)\s+(.*)
This let me rename registers for sake of clarity. I'm missing that. It's
a simple hack, just add an elsif block that looks like:
} elsif(/^\.constant \s+
(\w+) \s+
([NISP]\d+)
/x) { # .constant {name} {string
$self->{constants}{$1} = $2;
}
Other things to note:
The assembler seems unhappy with multiple labels for the same
codepoint. This is no longer allowed:
NSORT:
COMBSORT:
operation....
To allow a bsr NSORT or a bsr COMBSORT to jump to the same instruction you
now have to write:
NSORT:
noop
COMBSORT:
operation....
And it works fine.
The keyed operators get_keyed, set_keyed are unhappy with constants:
get_keyed S0, P0[0]
For example. Writing them the old way still works.
After all this, and checking it in I still can't get BASIC to assemble
correctly. The last remaining error I get is:
C:\projects\parrot\parrot\languages\BASIC>..\..\parrot.exe basic.pbc
PackFile_Constant_clear: Unrecognized type ' ' during unpack!
PackFile_unpack: Error reading constant table segment!
Parrot VM: Can't unpack packfile basic.pbc.
BASIC's all checked in with the corrections noted above. I patched my
version of assemble.pl to allow register redefinition (.constant FOO
I0). But other than that, once this last error is found it's ready to
go. Suggestions?
