Thanks for answer!! But what you mean when say 32_64 value representation? Do you mean it must work for 32 bit architecture??
On Fri, Feb 17, 2012 at 10:47 AM, Filip Pizlo <[email protected]> wrote: > The JIT class is quite large, and so its implementation is broken up into > multiple files. The manner in which it is broken up is somewhat arbitrary, > with the main goal being to not have any outrageously large .cpp files. > Here's the intuition I use for finding what I want: > > JIT.cpp: the harness that runs the JIT and a few utility functions that > are not related to any particular bytecode opcode. > JITArithmetic.cpp: implementation of arithmetic instructions. > JITCall.cpp: implementation of calling convention, including call > instructions. > JITPropertyAccess.cpp: implementation of heap access instructions. > JITOpcodes.cpp: implementation of miscellaneous instructions that don't > fit into the above. > > But there is also a second split: the JIT can either be generating code > that uses the 32_64 value representation, or the 64-bit value > representation. These two representations require two completely different > code generators and most of the code in the JIT is specialized on one or > the other. Hence any file that is marked 32_64 (like JITArithmetic32_64) > contains implementations for the 32_64 value representation, whereas files > that do not have "32_64" in them are implementing either the 64-bit value > representation, or code that is agnostic towards value representation. > > -Filip > > > > On Feb 17, 2012, at 7:02 AM, wingoog moon wrote: > > > HI All. > > Can't understand difference between jit/JITArithmetic32_64 and > jit/JITArithmetic. > > Both of them are implementing JIT class. So when program calls functions > from JITArithmetic and when JITArithmetic32_64. > > > > I also noticed that that there is JITOpcodes class, which is also > implementing JIT class. Why we need this class. > > > > P.s > > Sorry for bad English > > thanks for answers. > > _______________________________________________ > > webkit-dev mailing list > > [email protected] > > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > >
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