MC68000 Assembly Language Plugin

MC68000 Assembly Language Plugin is plugin for Jetbrains IDEs (CLion, IntelliJ, etc.).

Purpose

This plugin delivers support for MC68000 assembly language files (VAsm / DevPac-Style).

It adds a language parser with syntax highlighting, referencing and refactoring support, and a few more features.

I'm an Amiga retro democoder, and the lack of a plugin for M68k was the motivation to write one. Also, diving deep into custom language plugins has a steep learning curve.

When I started the plugin in July 2021, I was not aware of the M68k plugin efforts by Jetbrains employee Yann Cébron who has been working on the same topic for quite some time. At the time of writing, his plugin however, has not been release yet. Nevertheless, it has a lot of awesome features and is pretty advanced. Check it out. You can install both plugins at the same time and see what suits you more.

Big kudos to Yann -- a few features were inspired by his code.

My plugin, on the other hand, is still pretty basic and is the result of a few weeks of work. I released a really early first version it because I think it's " good enough" to get started, and I can return to demo coding with its current state.

Features

• Parser / Lexer for MC68000 (yes, only 68000 right now!) assembly language files in VAsm / DevPac style
• Inspection for validating the syntax of the 68000 ISA.
• Syntax highlighting and Color Settings Page (you should really modify the color settings to your likings!)
• Mnemonics code completion
• Symbols / Labels / Macros code completion
• References / Refactoring support for local and global labels, symbol assignments, and macros.
• Simple register usage flow (hover over register or press F1 for full flow)
• Brace matching
• Quote handler
• Goto Symbol support
• Structure view
• Documentation provider for symbol definitions and mnemonics (listing available addressing modes etc.).

Known issues

• Find Usages always shows "Unclassified" though it shouldn't (?)
• Macro invocations are not yet evaluated, thus no referencing to symbols defined via macros (e.g. STRUCT).
• No support for includes. Scoping is for global symbols and labels is currently the whole project.
• No support for register replacement (e.g. registers replaced by EQUR or EQURL will cause syntax errors)
• While the Lexer supports the -spaces option (where a space introduces a comment), this cannot be configured yet (default is off).
• No support for other processor instructions, FPU or 68020+ address modes.
• Unit Test coverage is not as good as it could be (ahem).
• opt keyword needs special treatment and will currently show a parsing error.
• Missing but planned features:
  • Macro evaluation on invocation
  • Folding
  • Semantic inspections
  • Quick fixes
  • Formatter + Code Style Settings
  • Register use analysis (but this only makes sense after macro evaluation)
  • Cycle counting

Recommendations

Currently, I would suggest using the fabulous Browse Word at Caret Plugin to highlight the same address and data registers while editing (see new View -> Highlight Word at Caret menu item).

Development notice

This plugin has been written in Kotlin 1.5 using Grammar-Kit.

It is probably the only plugin (besides Cajon from the same author) that uses JUnit 5 Jupiter for unit testing so far (or at least the only one I'm aware of ;) ). The IntelliJ framework actually uses the JUnit 3 TestCase for plugin testing, and it took me quite a while to make it work with JUnit 5. Feel free to use the code (in package de.platon42.intellij.jupiter) for your projects (with attribution).

Changelog

V0.5 (unreleased)

• Bugfix: movem ISA was wrong regarding the movem.w <ea>,<registerlist> (sign extends registers).
• Cosmetics: Changed Register Flow Documentation wording from reads to uses and from modifies to changes.
• Bugfix: Minor fix for andi/eori/ori to ccr which were not byte sized in ISA.
• Bugfix: Added alternate condition code tests HS (=CC) and LO (=CS).
• Performance: Optimized mnemonic lookup.
• Enhancement: Reworked Instruction Documentation provider, now shows condition codes.
• Bugfix: In ISA exg is no longer treated as setting a definitive value.
• New: Added inspection find dead writes to registers!

V0.4 (03-Aug-21)

• Notice: Due to major new API use, this plugin no longer works on IDEs >=2019.3.1, but rather requires >=2020.3.
• Enhancement: Added Structure View filters.
• New: Added inspection to validate the correctness of a MC68000 instruction regarding operation size and address modes.
• Bugfix: Added several missing assembler directives (opt, machine, etc.).
• Bugfix: Uppercase hexadecimal literals were not parsed (JFlex bug?).
• Bugfix: Interpretation of register lists was wrong in BNF.
• New: Added Documentation Provider for symbol definitions (shows assigned declaration).
• New: Added Documentation Provider for mnemonics (simple version, generated out of ISA information).
• Bugfix: Macro definitions with colons and without space supported (as found in P61a source).
• New: When asking for documentation on registers, a code flow analysis is done. Cool stuff!

V0.3 (28-Jul-21)

• Enhancement: Macro contents are no longer parsed, added syntax highlighting options for macros.
• Enhancement: Macro definitions are now word and stub indexed, macro calls reference to definition.
• New: Macro definition refactoring and find usages support.
• Enhancement: Structural View also shows macro definitions.
• Bugfix: Missing REPT and ENDR assembler directives added.
• Cosmetics: Changed or added some icons at various places.
• Performance: Reference search for global labels and symbols now uses stub index.
• Compatibility: Restored compatibility with IDE versions < 2021.1.
• Performance: Optimized lexer.

V0.2 (27-Jul-21)

• Cosmetics: Added (same) icon for plugin as for file type.
• Performance: Use Word-Index for global labels and symbols instead of iterating over the file.
• Performance: Use Stub-Index for global labels and symbols.
• Bugfix: No longer reports a syntax error when file lacks terminating End-Of-Line.
• Enhancement: Registers are now offered for code completion, making editing less annoying.

V0.1 (20-Jul-21)

• Initial public release.