[Parser] Replace Signedness with ternary Sign #4698
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Previously we were tracking whether integer tokens were signed but we did not differentiate between positive and negative signs. Unfortunately, without differentiating them, there's no way to tell the difference between an in-bounds negative integer and a wildly out-of-bounds positive integer when trying to perform bounds checks for s32 tokens. Fix the problem by tracking not only whether there is a sign on an integer token, but also what the sign is.
kripken
approved these changes
May 27, 2022
aheejin
reviewed
May 30, 2022
| }; | ||
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| enum Signedness { Unsigned, Signed }; | ||
| enum Sign { NoSign, Pos, Neg }; |
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Is there any reason we need to have both NoSign and Pos? Can't we make the default Pos, and change it to Neg only when we take -?
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Hmm nevermind. We need to distinguish u32 vs. s32...
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Previously we were tracking whether integer tokens were signed but we did not
differentiate between positive and negative signs. Unfortunately, without
differentiating them, there's no way to tell the difference between an in-bounds
negative integer and a wildly out-of-bounds positive integer when trying to
perform bounds checks for s32 tokens. Fix the problem by tracking not only
whether there is a sign on an integer token, but also what the sign is.