myvm

myvm is a small stack-based virtual machine implemented in C. The virtual machine implements a small set of instructions. This virtual machine is based on the virtual machine described in this book.

• Travis (https://travis-ci.org/ancailliau/myvm/)

In progress documentation

The first eight bits represents the opcode. The trailing bits represents the argument (or the arguments), as the following schema shows.

| 0        7 | 8                           32 |
|------------|--------------------------------|
|  opcode    |  arg1                          |
|------------|--------------------------------|

|<- 8 bits ->|<- 24 bits -------------------->|


| 0        7 | 8           20 | 21         32 |
|------------|----------------|---------------|
|  opcode    |  arg1          |  arg2         |
|------------|----------------|---------------|

|<- 8 bits ->|<- 12 bits ---->|<- 12 bits --->|

The following instructions are implemented

• hlt
• add
• sub
• mlt
• div
• mod
• minus
• and
• or
• not
• lt
• gt
• eq
• leq
• geq
• neq
• pushc
• pop
• swap
• dup
• say
• getlocal
• setlocal
• getparam
• save
• frame
• call
• reti
• retb
• retv
• ret

And the following instructions are not yet implemented

• getglob
• setglob
• getlit
• mkvec
• vref
• vset
• jmp
• jeq
• jne