ACME has a "real" PC and a "pseudo" PC. The "real" PC determines the
initial position in a 64KB buffer used to hold assembler output. If
the amount of code generated runs off the end, the assembler fails
with "produced too much code".
The source code generator in SourceGen was outputting a "real" PC
for the first address range and "psuedo" PCs for any address ranges
that followed. This produced nice results for code with a single
range, but caused problems for multi-range sources if the initial
range was high in memory and a later range was lower in memory.
While the assembler isn't actually generating more than 64KB of code,
ACME's buffer management was detecting an overflow.
Now, if a source file has multiple address ranges, we set the "real"
PC to $0000 and use a "pseudo" PC for all ranges. Output for projects
with a single address range is unmodified.
These were being overlooked because they didn't actually cause
anything to happen (a no-op .ORG sets the address to what it would
already have been). The assembly source generator works in a way
that causes them to be skipped, so everybody was happy.
This seemed like the sort of thing that was likely to cause problems
down the road, however, so we now split regions correctly when a
no-op .ORG is encountered. This affects the uncategorized data
analyzer and selection grouping.
This changed the behavior of the 2004-numeric-types test, which was
visibly weird in the UI but generated correct output.
Added the 2024-ui-edge-cases test to provide a place to exercise
edge cases when testing the UI by hand. It has some value for the
automated regression test, so it's included there.
Also, changed the AddressMapEntry objects to be immutable. This
is handy when passing lists of them around.
The uncategorized data scanner isn't supposed to create strings or
".fill" directives that straddle labels, long comments, notes,
visualizations, or ORG directives. The test for crossing an ORG
directive is incomplete, and doesn't correctly handle no-op ORGs
(where the new address is the same as the old address).
The code generator doesn't output ORGs that are hidden inside other
things, so we're not generating bad code, but it looks funny on
screen and may cause problems later on. The 2004-numeric-types test
has the basic .align/.fill/.bulk directive tests, and now has an
extended set of tests for uncategorized data region splitting.
Sometimes there's a bunch of junk in the binary that isn't used for
anything. Often it's there to make things line up at the start of
a page boundary.
This adds a ".junk" directive that tells the disassembler that it
can safely disregard the contents of a region. If the region ends
on a power-of-two boundary, an alignment value can be specified.
The assembly source generators will output an alignment directive
when possible, a .fill directive when appropriate, and a .dense
directive when all else fails. Because we're required to regenerate
the original data file, it's not always possible to avoid generating
a hex dump.
There's no easy way to make non-zero-bank 65816 code work, so I'm
punting and just generating a whole-file hex dump for those. This
renders tests 2007 and 2009 useless, so I'm hesitant to claim that
ACME support is fully functional.