On Wed, Mar 18, 2009 at 08:02:06AM +0100, Mike Hommey wrote: > On Tue, Mar 17, 2009 at 05:09:10PM -0700, Maciej Stachowiak wrote: > > > > On Mar 17, 2009, at 1:51 PM, Mike Hommey wrote: > > > >> Hi, > >> > >> I was taking a quick look at the JIT code and also gave a shot at > >> forcing a build of the x86-64 code under Linux. > >> > >> The main problem right now is the following: > >> ../JavaScriptCore/jit/JITArithmetic.cpp:664: error: cast from > >> 'JSC::Structure*' to 'unsigned int' loses precision > >> ../JavaScriptCore/jit/JITArithmetic.cpp:674: error: cast from > >> 'JSC::Structure*' to 'unsigned int' loses precision > >> ../JavaScriptCore/jit/JITArithmetic.cpp:714: error: cast from > >> 'JSC::Structure*' to 'unsigned int' loses precision > >> ../JavaScriptCore/jit/JITArithmetic.cpp:724: error: cast from > >> 'JSC::Structure*' to 'unsigned int' loses precision > >> > >> Looking at the code, it seems really too much x86-centric, and > >> depending on how the x86-64 ABI is under OSX. I don't know how things > >> are going to evolve with Snow-Leopard, as I hear the kernel will > >> finally > >> be 64-bits, but maybe the same issue will arise. > > > > The x86_64 ABI is standardized, so it should match between Linux and OS X > > for the things we care about. > > > >> Anyways, I'd need guidance from some people with JIT knowledge to help > >> me get it work on Linux. > > > > Sounds like either ALTERNATE_JSIMMEDIATE or JIT_OPTIMIZE_ARITHMETIC is > > not defined for you. It should be defined on x86_64. But it also sounds > > like a bug that pointers are being cast to unsigned in this code path. > > I'm not sure offhand how to fix it. But making sure those two > > preprocessor symbols are set should help. > > Oh thanks, that was it. I removed one PLATFORM(MAC) for ENABLE_JIT but > missed the one for ALTERNATE_JSIMMEDIATE. It built. I'll check if it > works (and will probably enable it in the debian packages, so that it is > mode widely tested)
FWIW, it crashes with a corrupted stack: (gdb) bt #0 0x00007fd115002c00 in ?? () #1 0x00007fd11f4f6d26 in JSC::JITStubs::cti_op_call_NotJSFunction (args=0x7fff27e13820) at ../JavaScriptCore/runtime/JSCell.h:206 #2 0x00007fd11fc55a3a in ?? () #3 0x0000000000000000 in ?? () I'll investigate later today. Mike _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org http://lists.webkit.org/mailman/listinfo.cgi/webkit-dev
