Pass actual stack pointers around instead of address 8 #2249
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This commit updates the implementation of passing return pointers from JS to wasm to actually modify the wasm's shadow stack pointer instead of manufacturing the arbitrary address of 8. The purpose of this is to correctly handle threaded scenarios where each thread will write to its own area instead of everyone trying to compete at address 8. The implementation here will lazily, if necessary, export the stack pointer we find the module and modify it as necessary. Closes rustwasm#2218
fitzgen
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Ah, this is awesome! Thanks @alexcrichton for implementing this. I totally did not get around it and had too much on my plate. Sorry I couldn't get involved earlier and work on a PR. When do you cut the next version of wasm-bindgen that includes this fix? |
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No worries! I basically do releases when requested, no schedule currently. Would you like a release to be made? |
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Yep, that would be amazing, so I could bumped the version in my project and make sure the js binding is thread safe. |
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Ok, I'm doing the bump at #2256 |
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This commit updates the implementation of passing return pointers from
JS to wasm to actually modify the wasm's shadow stack pointer instead of
manufacturing the arbitrary address of 8. The purpose of this is to
correctly handle threaded scenarios where each thread will write to its
own area instead of everyone trying to compete at address 8.
The implementation here will lazily, if necessary, export the stack
pointer we find the module and modify it as necessary.
Closes #2218