[LLVMdev] JIT question about resolving unknown function calls
clattner at apple.com
Mon Jun 29 10:18:49 PDT 2009
On Jun 29, 2009, at 3:37 AM, Carter Cheng wrote:
> My understanding is that the JIT system allows during the running of
> the system resolution of call instructions to undefined functions to
> be trapped and then patched with the correct address (is this true?).
> The question I have is does the current system also allow for
> repatching? for a certain OO system I am working on this could be
> desirable when an object/class is updated and replaced- making it
> possible in certain cases to update the call point as the code is
You can repatch a function that was hitted with the
ExecutionEngine::recompileAndRelinkFunction method. If you have a
symbol that isn't JIT'd that you want to move around, just define a
global that holds the pointer, and change the pointer as you wish.
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