[Parser] Parse tags and throw #6126
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When branches target control flow structures other than blocks or loops, the IRBuilder wraps those control flow structures with an extra block for the branches to target in Binaryen IR. Usually that block has the same type as the control flow structure it wraps, but when the control flow structure is unreachable because all its bodies are unreachable, the wrapper block may still need to have a non-unreachable type if it is targeted by branches. Previously the wrapper block would also be unreachable in that case. Fix the bug by tracking whether the wrapper block will be targeted by any branches and use the control flow structure's original, non-unreachable type if so.
Also fix the parser to correctly error if an imported item appears after a non-imported item and make the corresponding fix to the test.
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ashleynh
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Nov 21, 2023
| ;; CHECK-NEXT: ) | ||
| ;; CHECK-NEXT: ) | ||
| (func $throw | ||
| throw 2 |
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How did throw de bruijn 2 become $1?
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talked offline: not a de bruijn idx, but a tag idx.
ashleynh
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Also fix the parser to correctly error if an imported item appears after a non-imported item and make the corresponding fix to the test.
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Also fix the parser to correctly error if an imported item appears after a
non-imported item and make the corresponding fix to the test.