[LLVMdev] Can LLVM jitter emit the native code in continuous memory addresses ?

[Reid Kleckner]

It is possible to subclass JITMemoryManager and pass in a custom memory
manager, but I don't believe you'll be able to convince the JIT to emit PIC
code without hacking on LLVM a bit.

Reid

On Sun, Jun 26, 2011 at 4:21 AM, Mohammed Ag <admirer4 at gmail.com> wrote:

>    **
>
> I have question relating to LLVM Jitter: Can i obligue the LLVM Jitter to
> emit the native code in continuous memory addresses ? and to be PIC ? what i
> want to do is to move the JIT code to another process in order to execute
> it, my approach is to save the JIT code in buffer i will save it to file and
> pass it to the execution process.
>
> what i mean by "load" is to simply read the bits from file into buffer i
> don't want to generate elf or something like this.
>
> Here's an example: suppose i have C source file which contain:
>
> Global variables
> ----------------
> Function Foo()
> ----------------
> Function Too()
>
> when i request the JIT code i want the JIT to be in continuous memory
> addresses (with 4-bytes aligment):
>
> 0x100: Global Vars (take 16 Byte)
> 0x110: Foo() Code (take 32 Byte)
> 0x130: Too() Code (take 32 Byte)
> 0x150: end.
>
> So i can save the JIT code (form 0x100 -> 0x150) and i can load it in the execution process in any virtual address,
> assume (0x300 -> 0x350) and execute it by jump to the ep.
>
>
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