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Github Improve debuginfo for closures and async functions on Windows MSVC by wes...
source link: https://github.com/rust-lang/rust/pull/83941
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The issue was that the resulting debuginfo was too complex for LLVM to
translate into CodeView records correctly. As a result, it simply
ignored the debuginfo which meant Windows debuggers could not display
any closed over variables when stepping inside a closure or async fn.
This fixes that by creating additional allocas on the stack so that
the resulting debuginfo is simple (just *my_variable.dbg.spill) and
LLVM can generate the correct CV records.
I also updated some of our existing tests to run in CDB to cover this case.
Before (closure):
After (closure):
Before (async):
After (async):
Fixes #83709
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