[HLSL] Add support for user semantics #153424
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This is the first PR to implement the semantics proposal: https://github.com/llvm/wg-hlsl/blob/main/proposals/0031-semantics.md This PR focuses on the changes required to handle user semantics, but tried to be almost NFC. What changes is the error messages as the semantics case is not kept when reporting error messages. You might notice the SV_GroupIndex semantic is not properly validated as are others. This is an existing behavior that we'll need to fix, but wanted to keep this separated from this rewrite to stay as-close as an NFC as possible. The next PR will add support on the different kinds of I/O we can have using semantics (input, inout param, structs).
This commit adds the support for semantics annotations on structs, but
only for inputs. Due to the current semantics implemented, we cannot
test much more than nesting/shadowing.
Once user semantics are implemented, we'll be able to test arrays in
structs and more complex cases.
As-is, this commit has one weakness vs DXC: semantics type validation is
not looking at the inner-most type, but the outermost type:
```hlsl
struct Inner {
uint tid;
};
Inner inner : SV_GroupID
```
This sample would fail today because `SV_GroupID` require the type to be
an integer. This works in DXC as the inner type is a integer.
Because GroupIndex is not correctly validated, I uses this semantic to
test the inheritance/shadowing. But this will need to be fixed in a
later commit.
Requires llvm#152537
This commit depends on llvm#152537 and llvm#153224 This commit adds support for HLSL input semantics. User semantics are all semantics not starting with `SV_`.
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This commit depends on #152537 and #153224
This commit adds support for HLSL input semantics. User semantics are
all semantics not starting with
SV_.Those semantics ends up with a Location assignment in SPIR-V.
Note: user semantics means Location, but the opposite is not true. Depending on the stage, some system semantics can rely on a Location index. This is not implemented in this PR.