View source for User:WF

Scratchpad for working on Foenijs. Feature requests are welcome

== Debugger Features ==
+ = implemented, - = unimplemented

=== Stepping ===
+ Step 1 cycle

- Step N cycles (easy, just not exposed now)

+ Step to next raster line

+ Step to next frame

+ Step to IRQ

+ Step to RTI

+ Step Out (run until stack shrinks from the starting point)

=== Breakpoints ===
+ Break on 16-bit PC (raw CPU PC)  <code>machine.cpu.breakpoints16[]</code>

+ Break on 24-bit PC (post-MMU resolved address) <code>machine.cpu.breakpoints24[]</code>

+ Break on 24-bit address read <code>machine.mmu.breakOnRead[]</code>

+ Break on 24-bit address write <code>machine.mmu.breakOnWrite[]</code>

+ Break on BRK <code>machine.cpu.breakOptions.breakOnBRK</code>

+ Break on IRQ/NMI <code>machine.cpu.breakOptions.breakOnIRQ</code>  <code>.breakOnNMI</code>

+ Break on undocumented NOP (eg unexpected bytes) <code>machine.cpu.breakOptions.breakOnBadNOP</code>

+ Break on RTI <code>machine.cpu.breakOptions.breakOnRTI</code>

+ Break on single-instruction infinite loop <code>machine.cpu.breakOptions.breakOnInfiniteLoop</code>

=== Printing/Logging/Viewing ===
+ Log IRQ <code>machine.cpu.breakOptions.logIRQ</code>

+ Log BRK (always on for now)

- Log SOF 

+ Capture CPU execution log, <code>machine.cpu.debug</code>  to enable, <code>machine.cpu.log(n)</code> to print, n is optional number of instructions

+ Live updated memory view (lame, scroll through full memory)

- Create any number of live memory views of different sizes & locations

=== Intelligent stack capture (TODO) ===
Every push should have an annotation as to what pushed it, display in a custom stack viewer:

* PC of push or JSR instruction. JSRs and IRQs should display as 16-bit values
* Last JSR/IRQ entry, shows which function/handler we're in. Support loading labels.
* Support bank switching, so each page used as stack retains its state.