array-forth-0.2.1.4: A simple interpreter for arrayForth, the language used on GreenArrays chips.

Safe HaskellSafe-Inferred
LanguageHaskell98

Language.ArrayForth.Opcode

Synopsis

Documentation

type F18Word = Word18 Source

The 18-bit word type used by Greenarrays chips.

data Opcode Source

Each F18A instruction, ordered by opcode.

Constructors

Ret 
Exec 
Jmp 
Call 
Unext 
Next 
If 
MinusIf 
FetchP 
FetchPlus 
FetchB 
Fetch 
StoreP 
StorePlus 
StoreB 
Store 
MultiplyStep 
Times2 
Div2 
Not 
Plus 
And 
Or 
Drop 
Dup 
Pop 
Over 
ReadA 
Nop 
Push 
SetB 
SetA 

Instances

names :: [String] Source

The names of the different instructions, ordered by opcode.

opcodes :: [Opcode] Source

All of the opcodes, in order.

readOpcode :: String -> Either ParseError Opcode Source

Tries to read a given string as an opcode from the list of names.

toOpcode :: F18Word -> Opcode Source

Converts a word to an opcode. The word has to be < 32.

fromOpcode :: Opcode -> F18Word Source

Converts an Opcode to its 18-bit word representation.

isJump :: Opcode -> Bool Source

Returns whether the given opcode is a jump instruction expecting an address.

slot3 :: Opcode -> Bool Source

Can the given opcode go in the last slot?

opcodeTime :: Opcode -> Double Source

Estimates how long a given opcode will take to execute. Normal opcodes take 1.5 nanoseconds where ones that access the memory take 5 nanoseconds.