Rewrite the way LLVM JIT does memory allocation to allow use of more than one contiguous segment

[rajkosto]

I don't see why not ? Is this low area of memory used for anything else ?
Avoids LLVM out of memory fatal error when too many PPU modules get compiled and linked in.

[Nekotekina]

Because this is not a reliable solution

[rajkosto]

Would just changing s_memory_size to a larger value be more "reliable" ?

[Nekotekina]

No, need to eliminate this approach to allocation completely.

[rajkosto]

I've thought about writing a simple page-sized allocator into the space that's already there but since theres no deallocateCodeSection/deallocateDataSection functions that will ever be called anyway that would be a bit pointless, unless the allocator would just be there to allow usage of another memory region when the first one is exausted ?

[rajkosto]

I have written a new LLVM JIT memory allocator to take advantage of multiple segments so there really should be no way to get LLVM out of memory now (unless actual alloc call fails). Because LLVM can never deallocate JIT memory as it is now, I see no better way.

[zombie167]

Thank you very much! It works like a charm in MG4. I have encountered an unsolved PPU cache 137 modules compilation error before .The cache is compiled successfully with this build.

[Hopefullyidontgetbanned]

this could fix Elveon not running on rpcs3, using llvm

[Nekotekina]

Well, this approach can work for now. Although I don't get the point of calling reserve/reset instead of allocating all possible segments at startup.

[rajkosto]

Everything accessible in the low <2GB area is already reserved at startup.
The reserveAllocationSpace override is there so that we don't switch allocation segments mid-module (otherwise trampoline stuff, whose code path was never actually used before, can break).

[Nekotekina]

I meant emulator startup. Code under MAP_32BIT path doesn't seem to do it.

[rajkosto]

Ok, I've changed the MAP_32BIT path to greedy reserve as much as it can as well.

[tamarindojuice]

@rajkosto Hey you over here, i know you from Nintendo Switch scene ;)

(Sorry for the offtopic)