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Add memory allocation opcode. #18

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Dec 17, 2020
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Add memory allocation opcode. #18

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11 changes: 11 additions & 0 deletions opcodes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@
- [CFS: Shrink call frame](#cfs-shrink-call-frame)
- [LB: Load byte](#lb-load-byte)
- [LW: Load word](#lw-load-word)
- [MALLOC: Allocate memory](#malloc-allocate-memory)
- [SB: Store byte](#sb-store-byte)
- [SW: Store word](#sw-store-word)
- [Contract Opcodes](#contract-opcodes)
Expand Down Expand Up @@ -413,6 +414,16 @@ All these opcodes advance the program counter `$pc` by `4` after performing thei
| Encoding | `00010110 rd rs i i` |
| Notes | |

### MALLOC: Allocate memory

| | |
| ----------- | ---------------------------------------------------------- |
| Description | Allocate a number of bytes from the heap. |
| Operation | ```alloc MEM[$hp - $rs, $rs];```<br>```$hp = $hp - $rs;``` |
| Syntax | `malloc $rs` |
| Encoding | `00000000 rs - - -` |
| Notes | Does not initialize memory. |

### SB: Store byte

| | |
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