[Parser] Use unreachables to fulfill tuple requirements #6488
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This was referenced Apr 11, 2024
kripken
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Apr 11, 2024
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| auto* ret = scope.exprStack.back(); | ||
| if (ret->type.size() == size) { | ||
| if (ret->type.size() == size || ret->type == Type::unreachable) { |
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From your description I thought this was for tuples, but ret->type.size() == size can be the case for non-tuples too, can't it? (when size == 1)
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Yes, but since we report the size of Type::unreachable as 1, this code path was already taken for singular unreachable popped values.
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I see, thanks. Maybe worth a comment?
When we need to pop a tuple and the top value on the stack is unreachable, just pop the unreachable rather than producing a tuple.make. This always produces valid IR since an unreachable is always valid where a tuple would otherwise be expected. It also avoids bloating the parsed IR, since we would previously parse a `tuple.make` where all the children were unreachable in this case.
kripken
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When we need to pop a tuple and the top value on the stack is unreachable, just
pop the unreachable rather than producing a tuple.make. This always produces
valid IR since an unreachable is always valid where a tuple would otherwise be
expected. It also avoids bloating the parsed IR, since we would previously parse
a
tuple.makewhere all the children were unreachable in this case.