Implemented address region pre-labels. These are useful if the code is
relocating a block from address A to address B, because the code that
does the copying refers to both the "before" address and the "after"
address. Previously you'd give the block the "after" address and the
"before" would just appears as hex, because it's effectively an
external address.
Pre-labels are shown on screen with their address, but no other fields.
Showing the address makes it easy to see the label's value, which isn't
always obvious right before a .arstart. The labels are suppressed if the
address value evaluates to non-addressable.
This defines a new type of symbol, which is external and always global
in scope. Pre-labels affect label localization and must go through
the usual remapping to handle clashes with opcode mnemonics and the
use of leading underscores. Cross-references are computed, but are
associated with the file offset rather than the label line itself.
Added a new filter to the Symbols window ("PreL").
Implemented label input and checking in the address editor. Generally
added highlighting of relevant error labels.
Early data sheets listed BRK as one byte, but RTI after a BRK skips
the following byte, effectively making BRK a 2-byte instruction.
Sometimes, such as when diassembling Apple /// SOS code, it's handy
to treat it that way explicitly.
This change makes two-byte BRKs optional, controlled by a checkbox
in the project settings. In the system definitions it defaults to
true for Apple ///, false for all others.
ACME doesn't allow BRK to have an arg, and cc65 only allows it for
65816 code (?), so it's emitted as a hex blob for those assemblers.
Anyone wishing to target those assemblers should stick to 1-byte mode.
Extension scripts have to switch between formatting one byte of
inline data and formatting an instruction with a one-byte operand.
A helper function has been added to the plugin Util class.
To get some regression test coverage, 2022-extension-scripts has
been configured to use two-byte BRK.
Also, added/corrected some SOS constants.
See also issue #44.
We were providing platform symbols to plugins through the PlatSym
list, which allowed them to find constants and well-known addresses.
We now pass all project symbols and user labels in as well. The
name "PlatSym" is no longer accurate, so the class has been renamed.
Also, added a bunch of things to the problem list viewer, and
added some more info to the Info panel.
Also, added a minor test to 2011-hinting that does not affect the
output (which is the point).
