MAC is a really simple virtual machine. It's written in C and is [as of writing this] only one small C file.
This is the more advanced version, it has more instructions and
you can pass it files, for instance this file is test.mac:
1 5 1 1
3 11 1 9
1 0
Which is passed as an argument to the program ./mac test.mac and it will
execute the program. Note that there could be more error checks on memory,
etc. But these are not accounted for for simplicity and brevity.
register purpose
-------------------------------
A general purpose
B general purpose
C general purpose
D general purpose
E general purpose
F general purpose
EX extra
EXA extra
IP instruction pointer
SP stack pointer
op val usage function
---------------------------------------------------------------------
HLT 0 hlt halts program
PSH 1 psh val pushes <val> to stack
POP 2 pop pops value from stack
ADD 3 add adds top two vals on stack
MUL 4 mul multiplies top two vals on stack
DIV 5 div divides top two vals on stack
SUB 6 sub subtracts top two vals on stack
MOV 7 mov reg_a, reg_b movs the value in reg_a to reg_b
SET 8 set reg, val sets the reg to value
LOG 9 log a prints out a
IF 10 if reg val ip if the register == val branch to the ip
IFN 11 ifn reg val ip if the register != val branch to the ip
GLD 10 gld reg loads a register to the stack
GPT 11 gpt reg pushes top of stack to the given register
NOP 12 nop nothing