gir/ir.md

Gir uses two types of IR, with and without offsets

Without offsets
---------------
This is produced by `parse`. Each subsection shows the properties the
command object of that type has in IR without offsets

### add
property | value
---------|------
type     | `add`
value    | The number to add to current cell

Generated on `+` and `-`

### moveHead
property | value
---------|------
type     | `add`
type     | `moveHead`
value    | The number of steps to move the tape head right

Generated on `<` and `>`

### writeByte
property | value
---------|------
type     | `writeByte`

Generated on `.`

### readByte
property | value
---------|------
type     | `readByte`

Generated on `,`

### loop
property | value
---------|------
type     | `loop`
contents | An array of the commands making up the loop body

Generated on `[`…`]`

### clear
property | value
---------|------
type     | `clear`

Not generated by the parser directly, but generated by optimizations


With offsets
------------
This is produced by the optimization pass `addOffsetProperties`. Each
subsection shows the properties the command object of that type has in IR
with offsets

### add
property | value
---------|------
type     | `add`
value    | The number to add to the cell
offfset  | The location of the cell relative to current tape position

### moveHead
property | value
---------|------
type     | `moveHead`
value    | The number of steps to move the tape head right

### writeByte
property | value
---------|------
type     | `writeByte`
offset   | The location of the cell relative to current tape position

### readByte
property | value
---------|------
type     | `readByte`
offset   | The location of the cell relative to current tape position

### loop
property   | value
-----------|------
type       | `loop`
contents   | An array of the commands making up the loop body
isBalanced | Whether execution of the loop body ends in same cell it started in

### clear
property | value
---------|------
type     | `clear`
offset   | The location of the cell relative to current tape position