[webkit-dev] Non JS Function call.
oliver at apple.com
Tue Jul 24 14:05:01 PDT 2012
op_call_NotJSFunction is only referenced during the final linking phase.
Actual compilation requires two distinct operations: 1) planting the call instruction and 2) linking the call target after the code has been relocated. Here is the (64-bit) version of the call + link logic:
Call callCallNotJSFunction = call(); <-- here is the call
patchBuffer.link(callCallNotJSFunction, FunctionPtr(cti_op_call_NotJSFunction)); <-- here is us linking the call
On Jul 24, 2012, at 1:45 PM, vahe vardanyan wrote:
> Grep gives nothing, there is only one mention of op_call_NotJSFunction in privateCompileCTIMachineTrampolines(JITOpcodes.cpp), but I don't see any call instruction there.
> Still can't understand how calls orgonized in SXF.
> On 24 July 2012 20:07, Filip Pizlo <fpizlo at apple.com> wrote:
> On Jul 24, 2012, at 5:51 AM, vahe vardanyan <vahagner at gmail.com> wrote:
> > Hi all.
> > As I understand in SFX all non JS functions calls go trough JITStubs:op_call_NotJSFunction function.
> > But in which point, where, the op_call_NotJSFunction function is called?
> It's called from code generated by the JIT. I would start by running a command called "grep" on the code in the "jit" directory to search for mentions of NotJSFunction.
> > Can anyone please explain how function calls are implemented in SFX(simple jit).
> > Thanks for attention
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