69577b2454
This adds supports for the new EH instructions (`try_table` and
`throw_ref`) to the type checker.
One thing I'd like to improve on is the locations in the errors for
`catch_***` clauses. Currently they just point to the starting column of
`try_table` instruction itself. But to figure out where catch clauses
start you need to traverse `OperandVector` and check
`WebAssemblyOperand::isCatchList` on them to see which one is the catch
list operand, but `WebAssemblyOperand` class is in AsmParser and
AsmTypeCheck does not have access to it:
cdfdc857cb/llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp (L43-L204)
And even if AsmTypeCheck has access to it, currently it treats the list
of catch clauses as a single `WebAssemblyOperand` so there is no way to
get the starting location of each `catch_***` clause in the current
structure.
This also renames `valTypeToStackType` to `valTypesToStackTypes`, given
that it takes two type lists.
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