[kaffe] [PATCH] Add support for AMD64

[Dalibor Topic]

Salut Gwenole,

--- Gwenole Beauchesne <gbeauchesne at mandrakesoft.com> wrote:
> On Mon, 19 May 2003, Dalibor Topic wrote:
> 
> > > I planned to port JIT3 too by I hadn't got enough time recently to do so.
> 
> > > A few months ago, I implemented a run-time assembler though. It can
> handle 
> > > both IA-32 and AMD64 architectures with REX prefixes, SSE/SSE2 
> > > instructions.
> > 
> > I'm confused. What is a run-time assembler?
> 
> An assembler included in your program to assemble instructions at
> execution time (run-time). e.g. you write things like:
> 
>   MOVBrr(X86_BL, X86_DL);
>   MOVLmr(0, X86_NOREG, X86_RAX, 1, X86_EAX);
> 
> and you get the resulting opcodes in your buffer. This disassembles to:
> 
> 00000227: 88 da                 mov    %bl,%dl
> 00000229: 8b 04 05 00 00 00 8b  mov    0x0(,%rax,1),%eax
> 
> Otherwise, it's difficult to maintain if you hand-assemble things, and 
> this actually can be reused for other projects. ;-)

I see, I've browsed around a bit and turned up a few more runtime assemblers:

http://europa.spaceports.com/~schueler/asm/
(pentium, translates text at runtime into assembly)

http://www-sor.inria.fr/projects/vvm/realizations/ccg/ccg.html#toc1
(powerpc, sparc, pentium, translates C source code with assembler bits thrown
in at compile time into pure ANSI C. They have an example dynamic translator as
well)

http://www.pdos.lcs.mit.edu/~engler/pldi96-abstract.html
(mips, sparc, ... cross platform toolkit for dynamic code translation)

So what's the benefit of using a runtime-assembler? Cross-project jitters
(Basilisk II & kaffe ;)? That would be nice ...

cheers,
dalibor topic

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