160 lines
3.3 KiB
Markdown
160 lines
3.3 KiB
Markdown
Gir uses three types of IR, with and without offsets and flattened. Under
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each section each subsection shows the properties the command object of that
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type has in given IR
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Without offsets
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---------------
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This is produced by `parse`
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### add
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property | value
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---------|------
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type | `add`
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value | The number to add to current cell
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Generated on `+` and `-`
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### moveHead
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property | value
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---------|------
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type | `add`
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type | `moveHead`
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value | The number of steps to move the tape head right
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Generated on `<` and `>`
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### writeByte
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property | value
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---------|------
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type | `writeByte`
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Generated on `.`
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### readByte
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property | value
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---------|------
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type | `readByte`
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Generated on `,`
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### loop
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property | value
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---------|------
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type | `loop`
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contents | An array of the commands making up the loop body
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Generated on `[`…`]`
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### clear
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property | value
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---------|------
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type | `clear`
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Not generated by the parser directly, but generated by optimizations
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### writeInt
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property | value
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---------|------
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type | `writeInt`
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Generated on `:` if extensions are enabled
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### readInt
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property | value
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---------|------
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type | `readInt`
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Generated on `:` if extensions are enabled
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### breakPoint
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property | value
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---------|------
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type | `breakPoint`
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Generated on `#` if extensions are enabled
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With offsets
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------------
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This is produced by the optimization pass `addOffsetProperties`
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### add
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property | value
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---------|------
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type | `add`
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value | The number to add to the cell
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offfset | The location of the cell relative to current tape position
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### moveHead
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property | value
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---------|------
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type | `moveHead`
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value | The number of steps to move the tape head right
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### writeByte
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property | value
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---------|------
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type | `writeByte`
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offset | The location of the cell relative to current tape position
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### readByte
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property | value
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---------|------
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type | `readByte`
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offset | The location of the cell relative to current tape position
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### loop
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property | value
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-----------|------
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type | `loop`
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contents | An array of the commands making up the loop body
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isBalanced | Whether execution of the loop body ends in same cell it started in
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### clear
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property | value
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---------|------
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type | `clear`
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offset | The location of the cell relative to current tape position
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### multiply
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property | value
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---------|------
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type | `multiply`
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changes | Map of offsets to the number that should be added to those cells multiplies by the current cell
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### writeInt
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property | value
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---------|------
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type | `writeInt`
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offset | The location of the cell relative to current tape position
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### readInt
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property | value
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---------|------
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type | `readInt`
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offset | The location of the cell relative to current tape position
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### breakPoint
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property | value
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---------|------
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type | `breakPoint`
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Flattened
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---------
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This is produced by the optimization pass `flattenLoops`. `loop` doesn't
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exist in flattened IR, but all other unlisted commands are the same as in IR
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with offsets
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### jumpIfZero
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property | value
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---------|------
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type | `jumpIfZero`
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target | The index of the command to jump to if the current cell is zero
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### jumpIfNonZero
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property | value
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---------|------
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type | `jumpIfNonZero`
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target | The index of the command to jump to if the current cell is nonzero
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