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valid: Improve forward declaration validation #2232
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The handle dependency validation code was using the handle's index directly while trying to erase the handle type. This would cause the validator to crash while processing the first handle of the arena since it would be trying to construct a `NonZeroU32` with a zero. This commit fixes the issue by adding 1 to the index which not only fixes this panic but also makes so that the created Handle is equal to the passed handle (minus the type that was erased) It also fixes the error message not including the subject's kind
This commit enforces the forward dependency rules on the IR across functions and their calls, this fixes a crash in a later stage of the validator.
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jimblandy
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Jan 31, 2023
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This PR fixes an issue with the dependency code and adds dependency validation to function calls.
The handle validator had an issue that caused it to try to build a handle with a zero based index while type erasing handles, this would crash because the index must be a
NonZeroU32and it would also not be correct since the handle would be off by one from the original handle.It also fixes the error message for the forward dependency not containing the subject's kind.
Lastly it adds a dependency check for function calls, to prevent forward declarations to pass to further stages and cause crashes (mitigates gfx-rs/wgpu#4477)