BytecodeVM-Simple

A simple stack based Bytecode Interpreter / VM for Unity and C#

All in one file, but includes plenty comments on how things work. This isn't a fully fledged framework but it should give you a solid base to play around with bytecode machines.

Features / Included instructions

• Simple function call ( Hello World )
• Setting bytes to stack
• Simple function with two parameters ( Add )
• Printing a float using 4 bytes ( either using stack or without )
• Wait ( Pauses execution for a while )
• Repeat ( Jumps to first "code line" and clears the stack )

Code

        vm.Load(new byte[] {
                // Print Hello World
                (byte)VM.INST.PRINT_HELLO_WORLD,

                // Add(a,b) => push result,
                (byte)VM.INST.SET, (byte)2, // A
                (byte)VM.INST.SET, (byte)1, // B
                (byte)VM.INST.ADD,

                // Print float from 4 bytes (1234567 or 0x4996b438 or 49 96 b4 38)
                (byte)VM.INST.SET, 0x49,
                (byte)VM.INST.SET, 0x96,
                (byte)VM.INST.SET, 0xb4,
                (byte)VM.INST.SET, 0x38,
                (byte)VM.INST.PRINT_FLOAT,

                // Print float from 4 bytes WITHOUT USING STACK
                (byte)VM.INST.PRINT_FLOAT_NO_STACK, 0x49, 0x96, 0xb4, 0x38,

                // Wait using result from Add(a,b) since it's still in the stack
                (byte)VM.INST.WAIT,

                // Repeat
                (byte)VM.INST.REPEAT,
            });
        vm.Process(Time.time);

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This project is for all the poor souls who're looking for a simple scripting solution for Unity. Take it as an inspiration.

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