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Chris Dollin
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 Posted: Thu Oct 28, 2004 11:34 am Post subject: Re: [OT]Re: C to Java Byte Code |
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Galga wrote:
| Quote: | The product says it will compile into Java Byte Code, Not, I repeat,
NOT, Java Source; Those are two COMPLETELY seperate tasks. Get it right
or shut up Paul, because you're jsut diggering your own usenet grave
deeper and deeper.
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I must point out that Java bytecodes *that pass the bytecode verifier*
can almost always be back-translated to Java methods, and that the
exceptions (that I know of) are trivial [1] rather than interesting.
So, while Paul may be wrong, I don't think it's for that reason.
[1] I don't think the verifier complains about unreachable code, nor
about code-not-involving-this before the superconstructor gets
called; directly expressed in Java these provoke diagnostics.
--
Chris "electric hedgehog" Dollin
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Old Wolf
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| Posted: Thu Oct 28, 2004 7:52 pm Post subject: Re: [OT]Re: C to Java Byte Code |
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Chris Dollin <kers (AT) hpl (DOT) hp.com> wrote:
| Quote: | Galga wrote:
The product says it will compile into Java Byte Code, Not, I repeat,
NOT, Java Source; Those are two COMPLETELY seperate tasks.
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I should mention that this is not a particularly
odd thing to claim; MS's C++.net can compile C or C++
into a bytecode which I understand is not majorly different
to Java bytecode.
| Quote: | I must point out that Java bytecodes *that pass the bytecode verifier*
can almost always be back-translated to Java methods
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So if this compiler does what it claims, then we have a
method for transforming conforming C source into Java source
and it still runs correctly. I wonder if the converse is
possible? (converting a Java program to a conforming C
program that runs correctly).
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goose
Guest
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| Posted: Fri Oct 29, 2004 8:00 am Post subject: Re: [OT]Re: C to Java Byte Code |
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Chris Dollin <kers (AT) hpl (DOT) hp.com> wrote
| Quote: | Galga wrote:
The product says it will compile into Java Byte Code, Not, I repeat,
NOT, Java Source; Those are two COMPLETELY seperate tasks. Get it right
or shut up Paul, because you're jsut diggering your own usenet grave
deeper and deeper.
I must point out that Java bytecodes *that pass the bytecode verifier*
can almost always be back-translated to Java methods, and that the
exceptions (that I know of) are trivial [1] rather than interesting.
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<WARNING: Clueless about java bytecode>
ISTR that the mnemonics(sp?) that I've seen for java have
seperate instructions for working with different primitive
types.
So, assuming an "uc_push" and "uc_pop" instruction
for "push unsigned char on stack" and "pop unsigned char
from stack" respectively, and "f_push" and "f_pop" for
the floating point equivalents, it then follows that
the union code that paul posted can be trivially written
in java bytecode.
f_push 3.14
uc_pop first_byte
uc_pop secnd_byte
uc_pop third_byte
uc_pop forth_byte
Now I really am curious, is there anyone here (maybe the OP
who created the c->java bytecode product) who can verify
that the JVM does indeed work as I think it does?
| Quote: | So, while Paul may be wrong, I don't think it's for that reason.
[1] I don't think the verifier complains about unreachable code, nor
about code-not-involving-this before the superconstructor gets
called; directly expressed in Java these provoke diagnostics.
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Yes, but will it complain about code like above (if above
code is actually java bytecode).
goose,
WTH was this crossposted to alt.sex.gay?
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Joona I Palaste
Guest
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| Posted: Fri Oct 29, 2004 8:43 am Post subject: Re: [OT]Re: C to Java Byte Code |
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goose <ruse (AT) webmail (DOT) co.za> scribbled the following
on comp.lang.c:
| Quote: | goose,
WTH was this crossposted to alt.sex.gay?
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That was Galga's idea. He is apparently quite fixated on personally
insulting Paul Lutus.
--
/-- Joona Palaste (palaste (AT) cc (DOT) helsinki.fi) ------------- Finland --------
-------------------------------------------------------- rules! --------/
"It sure is cool having money and chicks."
- Beavis and Butt-head
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