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[js-api] Throw consistent exns in "read the imports" #523
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Instead of allowing ToWebAssemblyValue to throw a TypeError, explicitly catch any exceptions and throw a WebAssembly.LinkError.
Instead of allowing ToWebAssemblyValue to throw a TypeError, explicitly catch any exceptions and throw a WebAssembly.LinkError.
rossberg
approved these changes
Feb 15, 2024
document/js-api/index.bs
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| @@ -370,7 +370,7 @@ A {{Module}} object represents a single WebAssembly module. Each {{Module}} obje | |||
| 1. Throw a {{LinkError}} exception. | |||
| 1. If |valtype| is [=v128=], | |||
| 1. Throw a {{LinkError}} exception. | |||
| 1. Let |value| be [=ToWebAssemblyValue=](|v|, |valtype|). | |||
| 1. Let |value| be [=ToWebAssemblyValue=](|v|, |valtype|). If this operation throws an exception, catch it, and throw a {{LinkError}} exception. | |||
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I wonder if we should be specific to TypeError here. If there is any chance that TWAV could throw another exception (now or in the future), should that also become a LinkError? (Probably not.)
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I think it could make sense to be specific to TypeError, so I pushed that change. I think in practice it shouldn't be possible for TWAV to throw other exceptions at this particular call site currently.
For example, TWAV can throw a SyntaxError if BigInt conversion fails on a string but it should be guarded by the conditions here. But that property isn't immediately apparent either.
rossberg
approved these changes
Feb 16, 2024
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Fixes #521. Goes along with #498.