rafaelescrich / foovm

A Simple Bytecode Runtime

FooVM

A Simple Bytecode Runtime

go get github.com/apkrieg/foovm

Description

This runtime was built at part of a contest with circle601 to see which runtime could run a set of example applications the fastest.

This runtime was the winner as it was the only runtime that could pass all the tests.

Hello World!

push 16        ; string heap index
push 0         ; string heap segment
push 12        ; string length
push 0         ; print call index
push 255       ; runtime call segment
call           ; call print
push 1         ; exit call index
push 255       ; runtime call segment
call           ; call exit
"Hello World!" ; "Hello World!" string

Bytecode Reference

Instruction	Mnemonic	Op Code	Description
Nil	nil	0x00	Nil pointer/no-op
Push	push	0x01	stack <- data
Pop	pop	0x02	<- stack
Load	load	0x03	Load data from heap to stack
Store	store	0x04	store data from stack to heap
Add	add	0x05	Add pop1 + pop2
Subtract	sub	0x06	Subtract pop1 - pop2
Multiply	mul	0x07	Multiply pop1 * pop2
Divide	div	0x08	Divide pop1 / pop2
Call	call	0x09	Call a function
Return	ret	0x0a	Return from function
Jump	jmp	0x0b	Jump to address
Compare	cmp	0x0c	Compare two values
Jump if Equal	jeq	0x0d	Jump if a == b
Jump if not Equal	jne	0x0e	Jump if a != b
Jump if Greater Than	jgt	0x0f	Jump if a > b
Jump if Less Than	jlt	0x10	Jump if a < b
Jump if Less Than or Equal	jle	0x11	Jump if a <= b
Jump if Greater Than or Equal	jge	0x12	Jump if a >= b