Hi, seems the original mail was sent to both webkit-dev and webkit-help. My reply was on webkit-help, and the discussion continued there.
https://lists.webkit.org/pipermail/webkit-help/2009-November/000380.html Perhaps we should clarify better the purpose of these mailing lists, since if people can't decide which list is better for them, they do double posts. Zoltan > On Nov 4, 2009, at 8:37 AM, ll Jefferry wrote: > >> Hi, >> >> when i reading the jit for arm source code, i am not very clear the >> functionality of the flowing functions: >> ctiTrampoline > > This code is used when entering from the C runtime into JIT generated > code. JIT generated code does not necessarily respect C calling > conventions, so this routine sets up the stack frame, preserves > registers, etc, as necessary to allow the JIT code to be run. > >> ctiVMThrowTrampoline > > To perform certain operations the JIT will call back into C code. > Usually the C callback can just return in a perfectly normal fashion > and continue execution once it has completed, however in the case that > an exception is thrown special handling is required to change the > control flow. The return address of the C callback is instead changed > to point to this, and this piece of code handles looking up the > exception handler at which execution will be resumed. > >> ctiOpThrowNotCaught > > This is used to from within cti_op_throw, which implements the 'throw' > keyword in JavaScript. The cti_op_throw method will attempt to look > up a handler routine that catches the exception. However if the > exception is not caught it is necessary to force an early termination > of JIT execution. The cti_op_throw C callback always modifies its > return address, either to point to the code for the appropriate > exception handler to catch the exception, or to ctiOpThrowNotCaught if > no handler is found. > >> >> 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? > > Zoltan, Gabor? > >> >> >> thanks! >> >> BR, >> Jeff >> >> _______________________________________________ >> webkit-dev mailing list >> webkit-dev@lists.webkit.org >> http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > > _______________________________________________ > webkit-dev mailing list > webkit-dev@lists.webkit.org > http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev > _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev