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[js-api] Throw in toResizableBuffer if memory has no max #1871

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[js-api] Throw in toResizableBuffer if memory has no max #1871

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7 changes: 3 additions & 4 deletions document/js-api/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -768,10 +768,9 @@ Immediately after a WebAssembly [=memory.grow=] instruction executes, perform th
1. Let |memaddr| be **this**.\[[Memory]].
1. Let |store| be the [=surrounding agent=]'s [=associated store=].
1. Let |memtype| be [=mem_type=](|store|, |memaddr|).
1. If |memtype| has a max,
1. Let |maxsize| be the max value in |memtype|.
1. Otherwise,
1. Let |maxsize| be 65536 × 65536.
1. If |memtype| does not have a max,
1. [=Throw=] a {{TypeError}} exception.
1. Let |maxsize| be the max value in |memtype|.
1. Let |resizableBuffer| be the result of [=create a resizable memory buffer|creating a resizable memory buffer=] from |memaddr| and |maxsize|.
1. Perform [=!=] [$DetachArrayBuffer$](|buffer|, "WebAssembly.Memory").
1. Set **this**.\[[BufferObject]] to |resizableBuffer|.
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