[webkit-help] jit for arm

[Jason Rukman]

Are these cti functions doing more than just jumping to JIT code?  The
routines seem to do more than just branch (at least in the ARM version I
was looking at) and I'd like to understand them more.

-----Original Message-----
From: webkit-help-bounces at lists.webkit.org
[mailto:webkit-help-bounces at lists.webkit.org] On Behalf Of Zoltan
Herczeg
Sent: Wednesday, November 04, 2009 9:55 AM
To: ll Jefferry
Cc: webkit-help at lists.webkit.org
Subject: Re: [webkit-help] jit for arm

Hi Jeff,

ctiTrampoline: wrapper (helper) function to call the JIT code from C++
ctiVMThrowTrampoline: wrapper (helper) function to call the cti_wmThrow
(exception handling function) from the JIT.
ctiOpThrowNotCaught: return to C++ if an exception is unhandled by the
JIT
code. Kinda side exit.

cacheFlush uses NAPI (new API) call style for Linux. The necessary
constant is defined by Linux kernel headers, but we would not want
WebKit
to depend those headers (hopefully they don't want to change it soon).

Zoltan

>> Hi,
>>
>
>
>> when i reading the jit for arm source code, i am not very clear the
>> functionality of the flowing functions:
>>         ctiTrampoline
>>         ctiVMThrowTrampoline
>>         ctiOpThrowNotCaught
>>
>> could you explain to me?
>> and another question is that:  in cacheFlush function, why the system
>> call
>> number is 0xf0002? if it is defined by the toolchain?
>>
>>
>> thanks!
>>
>> BR,
>> Jeff
>>
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