Bootstrapping Forth on JVM, .NET CLR, etc.

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  • 1. [newbie] return stack commands
    Can someone tell me the 'standard' words for dealing with the return stack pointer? RSP@ ( -- address) This command gives the starting address of the return stack (the address it was intialised to at start-up)? Correct? (I don't like to use 'top' of the stack, because it depends which way your stack grows). RSP! (address -- ) This will SET the return stack pointer to the address? Correct? So, to re-set the return stack at the beginning of a QUIT loop, I can just do RSP@ RSP! Is there a command to see where the return stack is currently pointing? Is it even necessary? I ask, because I am slightly confused over word nomenclature, and which words are more prevalent/accepted. I am also seeing references elsewhere on the web to RS0, R0, and S0. Any information greatfully recieved. Thank you Mark.
  • 2. Dijkstra's guarded commands
    Gerry < XXXX@XXXXX.COM > writes Re: Dijkstra's guarded commands [..] > Given the if guarded command written as (using a different > syntax to avoid overloading IF) > if[ <boolean1> ==> <statement1> > [] <boolean2> ==> <statement2> > ... > [] <booleann> ==> <statementn> > ]then > where the <boolean>s and <statements> are just a sequence of Forth > words. The question is what to compile and how to introduce non- > deterministic selection if more than 1 <boolean> evaluates true. Instead of testing which number m of these n statements is true, and then jump-executing the "m choose"-th one, why not visit the n statements in random order and jump to the first that is true? A random number generator based on a feedback shiftregister does this, but you may want to implement Floyd's algorithm as described in 'More Programming Pearls' by Jon Bentley (column 13, page 141). This algorithm needs only m "choose" calls to build a set of m numbers. Still another way is to generate the next permutation of the n statements on each new if[ call and again jump to the first statement that tests true. This is not random, but probably good enough. Downside: you need a global variable per case to remember the last permutation. -marcel

Bootstrapping Forth on JVM, .NET CLR, etc.

Postby joel reymont » Tue, 07 Aug 2007 14:38:01 GMT

Folks,

Suppose I wanted to bootstrap a Forth on a JVM, .NET CLR or another
existing VM.

Where would I start?

I'm learning Forth on a Mac (gForth) and don't want to use Windows.

My goal is to create a network link from my Mac to the target VM for
interactive development with cross-compilation and debugging happening
locally.

    Thanks, Joel


Re: Bootstrapping Forth on JVM, .NET CLR, etc.

Postby joel reymont » Tue, 07 Aug 2007 15:53:42 GMT

To be more precise... Suppose I started up gforth and I'm at the
interpreter prompt.

I want EXECUTE to generate the appropriate bytecode and run it on the
linked VM.

How do I make sure that EXECUTE is not the one that gforth supplies?

Do I hack at the gforth source code to build the cross-compiled Forth
and if so then is gforth the right Forth to start with?

I see no reason to re-implement the "outer interpreter" (right
expression?) and would like to let gforth parse my Forth code. I can't
envision how I would replace the code generation part, though.

    Thanks, Joel



Re: Bootstrapping Forth on JVM, .NET CLR, etc.

Postby Dmitry Ponyatov » Fri, 10 Aug 2007 03:01:27 GMT

You can use your own byte-code interpreter (a.k.a. inner interpreter =
engine = virtual machine) written in Java/C#, and cross-compiler
written in FORTH which generates byte-code from Forth-like language


Re: Bootstrapping Forth on JVM, .NET CLR, etc.

Postby Dmitry Ponyatov » Fri, 10 Aug 2007 03:04:52 GMT

at  http://www.**--****.com/ 
build upon this principle -- simple virtual forth machine in C with
some C++ elements and cross-compiler for SP-FORTH (I still now
understand vocabularies and use lower-cased words for FVM commands and
some non-standard language elements like { } var const buffer)


Similar Threads:

1.JVM vs CLR

2.Micro Focus COBOL runtime, /clr:pure, etc.

Pete raised this issue in another thread, and coincidentally I ran
smack up against it yesterday.

A .NET application compiled using the Micro Focus Net Express add-in
for Visual Studio will not run on a system which lacks the Micro Focus
COBOL runtime DLLs. I infer from the reference to accountants, that
the cost per seat to license the runtime is high. This rules out
redistribution on my part.

Interested developers could just download and install the same free
tools as I've already used to create my non-commercial project. I've
posted instructions on the Barbarian's CodePlex page, which explain
how to acquire and install these tools: Net Express 5.1 Personal
Edition, and the Visual Studio Shell which is its minimal requirement
for installation.

Granted, nobody should do this while on the clock. My application is a
toy.

Tell me, though, does the Micro Focus COBOL compiler have any command
line option similar to /crl:pure? This compiler option for Visual C++
2008 generates assemblies which run with nothing more than the .NET
runtime.

One last technical question. When working with other languages, the
command line arguments for the compiler are displayed in Visual
Studio's project properties. Does the Micro Focus add-in provide this
feature somewhere?

If I've violated the Net Express Personal Edition license agreement by
releasing a Micro Focus-dependent EXE to CodePlex, somebody please
tell me, so I can kill that project now.

Thanks.

 - Matt Fisher

3.a tutorial on bootstrapping forth?

For a while now I've been trying to find a good tutorial on implementing a
forth system from scratch.  I haven't found one yet so I decided to ask here
and see if anybody knows of one.

From my research I've learned about the inner/outer interpreters.  I've even
heard that some people have written extremely basic forth compilers in
assembly that support only a handful of words (e.g. get/set a byte, colon,
semicolon and a few others) and then they "cross-compile" forth code for
the two interpreters into full featured Forth system.

Does anybody know what the minimal set of words would be for the
"cross-compile" bootstrapping method?  Does anybody know of forth source for
an inner and outer interpeter combo?

Thanks,
Dave



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7. Fw: Using Forth to send a windows message to a MS application (spell checking etc)

8. cat-v.org FORTH v GO plan9 etc



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