[PATCH] D146595: [clang] Add clang trampoline attribute

[David Blaikie via Phabricator via cfe-commits]

dblaikie added a comment.

So looking at the DWARF spec for this - I see what it's going for, but yeah, I wouldn't want to use a textual representation either at the source or bitcode level, ideally... - perhaps this should just be implemented in LLVM when something's being lowered to a trampoline we could emit DWARF that describes that, without needing source annotations? Or are there situations where it depends on how the user wrote the code as to how we want the debugger to dehave?

If it's the latter, then, yeah, some "transparent to debugger" source attribute might be appropriate - that lowers to a bit on the DISubprogram and instructs LLVM to, if the function definition ends up lowering to a trampoline, mark that for the debugger so it's transparent - and if it lowers to a trampoline but doesn't have the source attribute, you can then still step into the function separately from stepping into the subsequent function?


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