Fix hashing of a use of a name without the context/target for it #3601
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tlively
approved these changes
Feb 24, 2021
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| static_assert(sizeof(Index) == sizeof(int32_t), | ||
| "wasm64 will need changes here"); |
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The data structure here is std::map<Name, Index> internalNames; so I think the idea in the assertion is that wasm64 might need something bigger than an Index if it has over 2^32 names? I agree it should be clarified.
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Before this we would assert on hashing e.g.
(br $x)by itself, without thecontext so we recognized the name
$x. Somehow that was not an issueuntil delegate, we just happened to not hash such things. I believe I remember
that @aheejin noticed this issue before, but given we didn't have a testcase,
we deferred fixing it - now is the time, I guess, as with delegate it is easy to
get e.g. CodeFolding to hash a Try with a delegate.
Issue found by emscripten-core/emscripten#13485