Metadata-Version: 2.1
Name: RASP-Machine
Version: 0.1.1
Summary: Emulator for the RASP machines proposed by Cook & Reckow in 1973
Home-page: https://github.com/fchauvel/rasp-machine
Author: Franck Chauvel
Author-email: franck.chauvel@gmail.com
License: UNKNOWN
Project-URL: Documentation, https://fchauvel.github.io/rasp-machine
Project-URL: Bug Tracker, https://github.com/fchauvel/rasp-machine/issues
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Environment :: Console
Classifier: Intended Audience :: Education
Classifier: License :: OSI Approved :: MIT License
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 3
Classifier: Topic :: Software Development :: Assemblers
Classifier: Topic :: System :: Emulators
Requires-Python: >=3.6
Description-Content-Type: text/markdown
Requires-Dist: argparse (==1.4.0)
Provides-Extra: dev
Requires-Dist: build (==0.3.1) ; extra == 'dev'
Requires-Dist: twine (==3.4.1) ; extra == 'dev'
Requires-Dist: pytest (==6.2.4) ; extra == 'dev'
Requires-Dist: coverage (==5.5) ; extra == 'dev'
Requires-Dist: pyyaml (==5.4.1) ; extra == 'dev'

# RASP Machines

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This is a small Python&nbsp;3 emulator for the random access stored
procedure machine (RASP) designed by Cook & Reckhow in 1973 below. I
developed this as a companion tool for a course in algorithms & data
structures, where it helps (I hope) to with understanding computation
models, growth orders and the applicability of the Big-O notation.

* Cook, Stephen A., and Robert A. Reckhow. "Time bounded random access
  machines." Journal of Computer and System Sciences 7, no. 4 (1973):
  354&ndash;375. [DOI](https://doi.org/10.1016/S0022-0000(73)80029-7)

In a nutshell, the RASP machine is a mini computer with eight
instructions, two registers (an accumulator and instruction pointer),
and an I/O device. As a computation model, it closely resembles an
actual computer, as opposed to a Turing machine for instance.

## How to install RASP?

The simplest way to install the latest version is to use PyPI as
follows:

```shell
  $ pip install rasp-machine
```

Please, refer to the [documentation](https://fchauvel.github.io/rasp-machine)
for a more comprehensive help!

## How to use the RASP machine?

### A Simple Program: Adding Two Integers

Let us consider a tiny program for the rasp machine. To simplify
writing programs, RASP provides a simple assembly language, as shown
below, with the code needed to read two integers from the I/O device
and to print their sum back onto it.

```
segment: data
    left     1       0
    right    1       0
    result   1       0

segment: code
    read     left      ;; left = user_input()
    read     right     ;; right = user_input()
    load     0
    add      left
    add      right
    store    result    ;; result = left + right
    print    result
    halt     -1
```

Provided we save the code above into a file named `addition.asm`, we
can get the associated machine code, using the following command
```shell-session
$ rasp assemble addition.asm
Machine code saved in 'addition.rx'
```

Note that the option `--debug` will yield machine code that contains
debugging information, useful when using the debugger.

### Debugging & Executing RASP

Now we have the machine code, we can execute it using the following commands:

```shell-session
$ rasp execute addition.rx
rasp? 10
rasp? 20
30
```

Note that you can extract some performance measure (CPU cycle, read,
writes, etc.) using the `--use-profiler` option.

Should there be any problem with the execution, we can start the
associated debugger with the command:
```shell-session
$ rasp debug addition.rx
RASP-Machine 0.1.0
 ┼ debug >
```



