This is a simulator for register machine. Register machine is a generic class of abstract machines used in a manner similar to a Turing machine. It operates on a tape of registers with a tape of commands. At the initial state, the first few registers contains the input and all other registers are set to 0, see Input/output conventions for more details.
| command | effect |
|---|---|
| z #i | set register i to be 0 |
| s #i | increase register i by 1 |
| j #i #j #k | if register i and j are the same, jump to the kth command |
Registers and commands are on different tapes in RM model.
Each command occupies a line.
| macro | effect |
|---|---|
| asn #i #j | copy the value of register j to register i |
- When the register machine starts, the k inputs are put on register 1 to k, all other registers are set to 0.
- When the register machine halts, the final value of register 1 is the result
- If the register machine failed to halt (for a certain number of runs), the result is set to infinite and the register machine will be forced to halt.
The first argument is the register machine file (tape of commands), and then follows the inputs to the RM.
python reg_machine example_rm 10The called register machine should be declared in the form # function_name before it's called. The declaration occupies a line but won't be put in the command list. A function call will be counted as one command. The register machine can be called in the form function_name #register_for_output #register_for_inputs