[LLVMdev] RFA: TREE_READONLY in LLVM-GCC

[Bill Wendling]

Hi LLVM-GCC hackers!

I have a global variable that I want to mark as "TREE_READONLY" so  
that it will become a "constant" in LLVM IR. This is for the new  
blocks-related stuff, but that's not necessarily important for this  
question. In particular, I want to mark the "block_holder" created in  
"build_block_literal_tmp()" as read-only.

My question to you is: Considering that LLVM-GCC uses only a small  
part of the GCC source base, what affect will marking the  
"block_holder" variable as TREE_READONLY have? Does LLVM-GCC run  
through code that looks at this flag and act differently before it  
generates the LLVM IR?

I know that this is a broad question and difficult to answer. I'm  
mostly looking for people's gut reactions to this proposal. My current  
plan is to "test it out and see if it works," but the testing might  
not be comprehensive enough to ferret out potential problems.

Thanks in advance!

-bw