Commit 5301f74
[CIR][Dialect] Remove 22 prefix and suffix from type aliases (#826)
We were previously printing the type alias for `struct S` as `!ty_22S22`
instead of just `!ty_S`. This was because our alias computation for a
StructType did the following:
os << "ty_" << structType.getName()
`structType.getName()` is a `StringAttr`, and writing a `StringAttr` to
an output stream adds double quotes around the actual string [1][2].
These double quotes then get hex-encoded as 22 [3].
We can fix this by writing the actual string value instead. Aliases that
would end in a number will now receive a trailing underscore because of
MLIR's alias sanitization not allowing a trailing digit [4] (which
ironically didn't kick in even though our aliases were always previously
ending with a number, which might be a bug in the sanitization logic).
Aliases containing other special characters (e.g. `::`) will still be
escaped as before. In other words:
```
struct S {};
// before: !ty_22S22 = ...
// after: !ty_S = ...
struct S1 {};
// before: !ty_22S122 = ...
// after: !ty_S1_ = ...
struct std::string {};
// before: !ty_22std3A3Astring22
// after: !ty_std3A3Astring
```
I'm not a big fan of the trailing underscore special-case, but I also
don't want to touch core MLIR logic, and I think the end result is still
nicer than before.
The tests were mechanically updated with the following command run
inside `clang/test/CIR`, and the same commands can be run to update the
tests for any in-flight patches. (These are for GNU sed; for macOS
change the `-i` to `-i ''`.)
find . -type f | xargs sed -i -E -e
's/ty_22([A-Za-z0-9_$]+[0-9])22/ty_\1_/g' -e
's/ty_22([A-Za-z0-9_$]+)22/ty_\1/g'
clang/test/CIR/CodeGen/stmtexpr-init.c needed an additional minor fix to
swap the expected order of two type aliases in the CIR output.
clang/test/CIR/CodeGen/coro-task.cpp needed some surgery because it was
searching for `22` to find the end of a type alias; I changed it to
search for the actual alias instead.
If you run into merge conflicts after this change, you can auto-resolve
them via
smeenai@715f061
[1]
https://github.com/llvm/llvm-project/blob/b3d2d5039b9b8aa10a86c593387f200b15c02aef/mlir/lib/IR/AsmPrinter.cpp#L2295
[2]
https://github.com/llvm/llvm-project/blob/b3d2d5039b9b8aa10a86c593387f200b15c02aef/mlir/lib/IR/AsmPrinter.cpp#L2763
[3]
https://github.com/llvm/llvm-project/blob/b3d2d5039b9b8aa10a86c593387f200b15c02aef/mlir/lib/IR/AsmPrinter.cpp#L1014
[4]
https://github.com/llvm/llvm-project/blob/b3d2d5039b9b8aa10a86c593387f200b15c02aef/mlir/lib/IR/AsmPrinter.cpp#L11541 parent 567b7af commit 5301f74
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+813
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lines changed- clang
- lib/CIR/Dialect/IR
- test/CIR
- CodeGen
- IR
- Lowering
- ThroughMLIR
- Transforms/Target/x86_64
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