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wasi: use WasmMemoryObject handle for perf #43544

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Jun 25, 2022
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@devsnek devsnek commented Jun 23, 2022

Store WebAssembly.Memory handle as a WasmMemoryObject, which lets us directly grab the ArrayBuffer instead of doing a property lookup in this hot path.

@devsnek devsnek requested a review from cjihrig June 23, 2022 06:21
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Review requested:

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@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. needs-ci PRs that need a full CI run. labels Jun 23, 2022
@devsnek devsnek force-pushed the use-wasm-memory-object-type branch 3 times, most recently from 0424be9 to 49c3b76 Compare June 23, 2022 06:32
@devsnek devsnek force-pushed the use-wasm-memory-object-type branch 2 times, most recently from d7ead7a to 5a05d10 Compare June 23, 2022 13:53

Local<ArrayBuffer> ab = prop.As<ArrayBuffer>();
std::shared_ptr<BackingStore> backing_store = ab->GetBackingStore();
Local<WasmMemoryObject> memory = PersistentToLocal::Strong(this->memory_);
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tiny and very ignorable style nit:

Suggested change
Local<WasmMemoryObject> memory = PersistentToLocal::Strong(this->memory_);
Local<WasmMemoryObject> memory = PersistentToLocal::Strong(memory_);

More directly, why are we not going on step further and storing the std::shared_ptr<BackingStore> here? That should be even faster.

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the arraybuffer gets detached every time the wasm grows its memory. very annoying problem, maybe it will be fixed one day: https://github.com/tc39/proposal-resizablearraybuffer#sync-up-capability-with-webassembly-memorygrow

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@devsnek devsnek force-pushed the use-wasm-memory-object-type branch from c440735 to 98a1262 Compare June 25, 2022 07:03
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PR-URL: #43544
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@devsnek devsnek force-pushed the use-wasm-memory-object-type branch from 98a1262 to 4778831 Compare June 25, 2022 18:01
@devsnek devsnek merged commit d4eef14 into main Jun 25, 2022
@devsnek devsnek deleted the use-wasm-memory-object-type branch June 25, 2022 18:01
devsnek added a commit that referenced this pull request Jun 25, 2022
PR-URL: #43544
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
targos pushed a commit that referenced this pull request Jul 12, 2022
PR-URL: #43544
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
targos pushed a commit that referenced this pull request Jul 20, 2022
PR-URL: #43544
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
targos pushed a commit that referenced this pull request Jul 31, 2022
PR-URL: #43544
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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