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add dynamic cfe & cfs #471

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merged 4 commits into from
Mar 17, 2023
Merged

add dynamic cfe & cfs #471

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574c29c
add register based cfe
Voxelot Mar 17, 2023
42ba074
add dynamic CFS
Voxelot Mar 17, 2023
9ad0b57
fix link
Voxelot Mar 17, 2023
b072de3
lint
Voxelot Mar 17, 2023
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add dynamic CFS
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@Voxelot
Voxelot committed Mar 17, 2023
commit 42ba074af6f8f17213e20741feb40b6edaaf53a3
19 changes: 18 additions & 1 deletion src/vm/instruction_set.md
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Expand Up @@ -42,8 42,9 @@
- [RET: Return from context](#ret-return-from-context)
- [Memory Instructions](#memory-instructions)
- [ALOC: Allocate memory](#aloc-allocate-memory)
- [CFEI: Extend call frame](#cfe-extend-call-frame)
- [CFE: Extend call frame](#cfe-extend-call-frame)
- [CFEI: Extend call frame immediate](#cfei-extend-call-frame-immediate)
- [CFS: Shrink call frame](#cfsi-shrink-call-frame)
- [CFSI: Shrink call frame immediate](#cfsi-shrink-call-frame-immediate)
- [LB: Load byte](#lb-load-byte)
- [LW: Load word](#lw-load-word)
Expand Down Expand Up @@ -838,6 839,22 @@ Panic if:
- `$sp imm` overflows
- `$sp imm > $hp`

### CFS: Shrink call frame

| | |
|-------------|----------------------------------------|
| Description | Shrink the current call frame's stack. |
| Operation | ```$sp = $sp - $rA``` |
| Syntax | `cfs $rA` |
| Encoding | `0x00 $rA - - -` |
| Notes | Does not clear memory. |

Panic if:

- `$sp - $rA` underflows
- `$sp - $rA < $ssp`


### CFSI: Shrink call frame immediate

| | |
Expand Down