register machine¶ ↑

a simple register machine, written in ruby (code is not optimized or even clean ;), but it works)

Instructions¶ ↑

Instruction		Description
CLOAD a		Load value a to register 1
LOAD r		Load value from register r to register 1
STORE r		Save value from register 1 to register r
CADD a		Add value a to value in register 1
ADD r			Add value in register r to value in register 1
CSUB a		Substract value a from value in register 1
SUB r			Substract value in register r from value in register 1
CMULT a		multiply value in register 1 with a
MULT r		multiply value in register 1 with value in register r
CDIV a		divide value in register 1 by a
DIV r			divide value in register 1 by value in register r
GOTO a		jump to line a
IF r1=0 GOTO a	jump to line a, if value in register 1 is equal to 0
END			exit the machine

the registers can only store natural integers and 0 (CSUB & SUB will at least result in 0, CDIV & DIV will result in integers, means 5/3=1)

unknown instructions will raise Exceptions

lines beginning with # are comments

the interpreter will always quit (on success) with a line similar to the following

[0, 1] in line 5 after 20 steps

this shows the register ([0, 1]), the last executed line, and the total number of steps

Usage¶ ↑

regmachine.rb [-t] [-c COUNT] [-a LIST] <file>
    -t, --trace                      trace commands
    -c, --count COUNT                register count
    -a, --assignment ASSIGNMENT      register assignment, format is: 1,2,3

For example:

regmachine -c 2 -a 5,1 samples/test.mch

this will start the interpreter with 2 registers, the two are filled with the values 5 and 1 (the sample will then count down to 0)

License¶ ↑

Creative Commons by-nc-sa 3.0

creativecommons.org/licenses/by-nc-sa/3.0/

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