[LLVMdev] multiple LLVMContext or just one?

[Lang Hames]

Hi,

LLVMContext was designed to support multithreading by holding the
compilation context for each thread in a separate LLVMContext. If you're
building modules in parallel you definitely need one LLVMContext per thread.

If you're talking about compiling multiple modules sequentially with a
single context I believe that should work, though I don't know how well
tested it is. I think our tools usually create an LLVMContext for each
Module to be compiled.

The llvm-link tool links multiple modules that share an LLVMContext (see
tools/llvm-link/llvm-link.cpp), so that use case has at least been tested.

- Lang.


On Wed, Jan 30, 2013 at 10:20 PM, edA-qa mort-ora-y <eda-qa at disemia.com>wrote:

> When building multiple modules should I be using multiple LLVMContext's
> or just one of them shared between the modules?
>
> I'm a little bit uncertain in regards to how the types work. The IR type
> checking appears to check exact ptrs for equality so how would multiple
> contexts actually work?  Or is the type checking limited to within a
> given module?
>
> --
> edA-qa mort-ora-y
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