gotfsvm

const (
	OpCode_UNKNOWN = 0

	// OpCode_Nat produces a 32 bit Nat from 24 bits of data stored in the instruction.
	OpCode_Nat = 32 << 24
)

const (

	// Input refers to a previoius commit by index
	// (index) -> (Root)
	// This Op reads from the entire input at the index.
	OpCode_Input
	// OpCode_Data loads from an index in the data table.
	// (index) -> (Value)
	OpCode_Data

	// Promote checks a segment for consistency and returns a root.
	// (Segment) -> Root
	OpCode_PROMOTE
)

const (

	// Select produces a segment from a Span within a Root
	// (Root, Span) -> (Segment)
	// This Op reads only from the Span within root.
	OpCode_SELECT

	// Concat takes 2 segments and concatenates them to produce a larger segment
	// ShiftOut shifts a segment out to a path
	// (Segment, Path) -> (Segment)
	OpCode_ShiftOut
	// ShiftIn shifts a segment by removing Path
	// It errors if not every path at that segment has Path as a prefix
	// (Segment, Path) -> (Segment)
	OpCode_ShiftIn
	// Pick produces a Root, taken from a specific path within another Root
	// (Root, Path) -> (Root)
	OpCode_PICK

	// (Segment, Segment) -> Segment
	OpCode_CONCAT
)

const (

	// Place takes a root, a path and a second root, and places the second root at that path in the first root.
	// The parent of that path must already exist in root.
	// (Root, Path, Root) -> Root
	OpCode_PLACE

	// MkdirAll creates the directory at path and any of its ancestors if necessary.
	// (Root, Path, FileMode) -> Root
	OpCode_MKDIRALL
)

const (
	Type_UNKNOWN = iota

	Type_Nat
	Type_Root
	Type_Segment
	Type_Span
	Type_Info
	Type_Extent
	Type_Path
	Type_FileMode
)

const ISize = 4