review-mcode

Enter planning mode. Scan the codebase for MCode optimization opportunities. Use parallelism where possible.

MCode replaces AHK-interpreted tight loops with native C machine code embedded as base64. The project already has an MCode pipeline (tools/native_benchmark/native_src/) and a working example (src/gui/icon_alpha.ahk). Adding a new function to an existing MCode module is low cost — the infrastructure exists.

What Qualifies

All four must be true:

1. Hot path — called frequently OR scales with data (per-window, per-pixel, per-byte). Use query_function_visibility.ps1 to check call frequency — a loop called 1x/session vs 100x/sec changes the MCode ROI. Use query_callchain.ps1 <funcName> -Reverse to trace all invocation contexts. Use query_timers.ps1 to check if the candidate is inside a timer callback (hot path signal).
2. Pure buffer computation — operates on Buffer / NumGet / NumPut, not AHK objects
3. Interpreter-bound — the bottleneck is AHK loop overhead, not an underlying Win32/native call
4. Measurable — worst-case cost exceeds ~100μs (below that, DllCall overhead eats the savings)

What Does NOT Qualify

• AHK built-ins that already call native C — StrPut, InStr, SubStr, Sort, RegExMatch etc.
• Loops over AHK objects/Maps/Arrays — MCode can't read AHK objects without COM interop
• Functions where the expensive part is a DllCall — GDI+, Win32 API calls. The loop around them is not the bottleneck.
• Anything under ~100μs worst case — DllCall marshaling overhead cancels the gain

What to Look For

• NumGet / NumPut inside loops (pixel processing, binary protocol parsing, buffer scanning)
• Byte-by-byte or word-by-word buffer iteration
• Math-heavy loops with no AHK object interaction
• Any loop where removing the body makes it instant (= per-iteration AHK overhead dominates)

Reference

• src/gui/icon_alpha.ahk — template for MCode embedding (base64 → CryptStringToBinary → VirtualProtect)
• tools/native_benchmark/native_src/icon_alpha.c — reference C source (no CRT, no imports, pure computation)
• tools/native_benchmark/ — benchmark harness and native build pipeline

Explore Strategy

Focus on files with buffer/binary operations:

• src/gui/gui_paint.ahk — rendering, pixel manipulation
• src/core/ — icon extraction, process info, any binary data handling
• src/shared/ipc_pipe.ahk — binary pipe protocol parsing
• src/pump/ — icon resolution, bitmap processing
• Any file with NumGet or NumPut usage

Plan Format

For each candidate:

File	Function	Loop Description	Est. Worst Case	Qualifies?	Why
foo.ahk:42	ScanBuffer()	NumGet loop over 256KB icon bitmap, ~65k iterations	~65ms	Yes	Pure buffer, no AHK objects, scales with icon count
bar.ahk:100	ParseWindows()	Loop over window array calling WinGetTitle	~2ms	No	Bottleneck is Win32 calls, not AHK loop

For qualifying candidates, additionally note:

• Whether it fits into an existing MCode module (e.g., icon_alpha) or needs a new one
• The C function signature it would need
• Any complication (pointer to AHK string, callback needed, etc.)

Ignore any existing plans — create a fresh one.