Parser:
- debug.log(expr, ...) and debug.assert(cond) syntax
- parse_debug_statement() handles both methods
- New AST variants: Statement::DebugLog and Statement::DebugAssert
Codegen:
- CodeGen::with_debug(bool) to toggle debug instrumentation
- DebugLog writes each expression to $4800 (Mesen debug port)
- DebugAssert evaluates condition; on false, writes $FF to $4800 + BRK
- Both are stripped entirely when debug_mode = false (release builds)
CLI:
- --debug flag now wired through to CodeGen
- Without --debug, all debug statements produce zero bytes
Analyzer:
- Type-checks DebugAssert condition as bool
- Walks DebugLog args for reads (used_vars tracking)
IR lowering:
- DebugLog/DebugAssert are no-ops (codegen handles them directly)
254 tests (5 new: 3 parser + 2 codegen).
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
Parser:
- p1.button.X and p2.button.X syntax
- Emits Expr::ButtonRead with Some(Player::P1) or Some(Player::P2)
- Plain button.X still works (defaults to P1)
- Removed #[allow(dead_code)] from Player::P1 and Player::P2
Runtime:
- NMI handler now reads both $4016 (JOY1) and $4017 (JOY2) in
the same loop, shifting 8 bits into ZP_INPUT_P1 ($01) and
ZP_INPUT_P2 ($08) simultaneously
- JOY2 register constant added
Codegen:
- Button reads select correct ZP address based on Player variant
- gen_condition and gen_expr both handle P1/P2 dispatching
Tests: 245 (3 new parser tests: p1/p2 button read + shift-assign)
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
Sprite/asset pipeline:
- Linker::link_with_assets() places sprite CHR data in ROM at correct tile
- assets::resolve_sprites() walks Program for inline sprite bytes
- CodeGen::with_sprites() maps sprite names to tile indices
- gen_draw() uses correct tile index from sprite declarations
- main.rs wires the full resolution pipeline
Shift-assign operators (<<= and >>=):
- AssignOp::ShiftLeftAssign and ShiftRightAssign variants
- Parser handles in both statement and array index contexts
- Codegen emits ASL A / LSR A
- IR lowering maps to ShiftLeft/ShiftRight ops
Unreachable state warning (W0104):
- BFS from start state finds reachable states via transitions
- States not reached produce W0104 warning
Error polish helpers:
- suggest_var_name() for "did you mean" suggestions
- emit_undefined_var() for E0502 with typo hints
- Used by analyzer for better diagnostics
242 tests pass, clippy clean.
https://claude.ai/code/session_01W6eQFStA66EuMKHUFo2rx3
