Help for JIT
tullmann at cs.utah.edu
Wed Aug 15 01:03:25 PDT 2001
> I'm looking into the JIT compiler of Kaffe. In the
> file "icode.c"( in kaffe/kaffevm/jit/icode.c ) there
You should look in the jit3/ directory for the most recent version of
the JIT code. Though I believe the code in jit/ still works.
The other critical file to look at is kaffevm/kaffe.def. That defines
the java bytecodes in terms of the macros you've already discovered.
The "sequence" struct is for generating machine instructions. It
contains data and a function for emitting the platform's instructions.
> The things to which these get defined do not seem to be function
> names though( example spill_Rxx, fspill_Rxx etc )!
Look at the define_insn() macro in kaffevm/jit*/funcs.c. This is what
converts the define_insn() macros in the config/* directories into
functions that the engine can invoke. I'm not sure what the point of
this macro is, it just defines a fixed function signature.
Note that this macro is different from the define_insn() used to
define the bytecodes (see the XXX in jit/funcs.c). (One is two arg,
one is single-arg).
> Would appreciate if someone could help..
Hope this helps.
----- ----- ---- --- --- -- - - - - -
Pat Tullmann tullmann at cs.utah.edu
"You can't have everything. Where would you put it?" -- S. Wright
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