[LLVMdev] Adding function attributes
baldrick at free.fr
Mon Nov 5 00:03:43 PST 2012
> I am coding a ModulePass in which I want to add an AlwaysInline attribute to
> every function so that they can be later inlined by the -always-inline pass.
why not just do the inlining yourself. The always inliner code is at
lib/Transforms/IPO/InlineAlways.cpp, and it's pretty short.
> However, the changes to the function seem to be lost after exiting my pass
> because the AlwaysInline attribute is not in the output LLVM IR.
> Maybe the function iterator passed by the module object actually points to
> copies of the functions?
As far as I can see your code should work. Most likely it isn't being run
at all - did you check that your runOnModule method is actually being called?
> Any help is much appreciated
> virtual bool runOnModule(Module& m)
> Module* module = &m;
> for (Module::iterator functionIter = module->begin(); functionIter !=
> module->end(); functionIter++)
> return true;
> Command line
> clang -O0 -S -emit-llvm -o test.S test.c && opt -S -mem2reg -load <path to lib>
> -mypass < test.S > test_opt.S
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