Another inline assembly question - Page 2

Johannes Bauer

Hi group,

inspired by the other inline assembly thread a question popped up in my
mind... Victor Bazarov mentioned in his response that the asm() clause
was covered by the C++ standard, subclause 7.3.. Well, I couldn't find
the C++ standard definition on the net, so I'm asking here:

Why is a thing like assembly covered by the standard at all? According
to Victor's response, it seems to be totally compiler dependent what's
done with the char* I pass on to asm(). If that were true, usage of
asm() would always yield undefined results (according to the standard).
Doesn't that totally defy the purpose of a standard in the first place?

And isn't usage of a highly object-oriented language mixed with
_assembly_, a language not only dependant on the running OS (like
implementation of system/library calls), but also to the very most
extent dependant on the hardware a little bit odd?

Well, just wondered... hope somebody can clear that up.
Greetings,
Johannes

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Jul 23 '05

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1621

Ioannis Vranos

E. Robert Tisdale wrote:

The JVM *is* available to other languages like C++.

May be I have missed that. May you provide more information on this? Is there a JVM C++
compiler?

--
Ioannis Vranos

http://www23.brinkster.com/noicys

Jul 23 '05 #11

Walter

"Ioannis Vranos" <iv*@remove.thi s.grad.com> wrote in message
news:1112809414 .369683@athnrd0 2...

Walter wrote:
And can't C++ just say that shorts are 16 bits? Does anyone care about
programming the PDP-10 in C++? (I personally have a big soft spot for
the -10, but let's face it, it's been obsolete for 20 years.) Anyone have 18 bit shorts on the CPU drawing table? I'd be shocked if there was. When people mention "Java" they are actually talking about two things. The

Java language (syntax) and the Java framework (JVM).
I'm talking about Java the language, of course, including its semantics as
well as syntax.
So in few words, C++ takes advantage of all facilities a system provides. If you target a virtual machine you get the type sizes and other facilities of the virtual machine, if you target a native machine you get the sizes of the native machine.

Are there any current or projected CPUs that have don't have 16 bit shorts?
Are there any current C++ compilers where shorts aren't 16 bits? Where chars
aren't 8 bits? Anyone have plans for one?

(BTW, Java targetting a VM rather than a native CPU is not what makes it
portable. What makes it portable is having more thoroughly defined semantics
of the language than C++ has. Java the language can, and has been,
implemented without a VM.)

Jul 23 '05 #12

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