[LLVMdev] First steps with LLVM and partial evaluation

Nick Lewycky nicholas at mxc.ca
Wed Jul 6 10:39:08 PDT 2011

Martin Apel wrote:
> static LLVMContext context;

That's your bug.

Here's the situation that contexts help with. Suppose you write a 
library that uses LLVM under the hood (graphics, let's say), and I write 
another one that uses LLVM and does audio processing. Someone then 
decides to write a video game that uses both of our libraries. As long 
as we each use a separate context, everything about llvm will stay 
entirely and completely segregated and we'll never interfere with each 

The module and the function your pass runs on and all of the types in it 
were created with a certain LLVMContext, but then you tried to mix your 
own LLVMContext in there. Don't do that, always pull the context from 
the IR that you're given. llvm::Value has a getContext() method on it.


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