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I don’t believe it is currently possible for a WebAssembly instance to access any buffer other than its own memory. You have to copy data in and out.
by panic 2y ago
I don’t believe it is currently possible for a WebAssembly instance to access any buffer other than its own memory. You have to copy data in and out.
- deathanatos 2y agoThe embedder could hand the module functions for manipulating external buffers via externrefs. (I'm not sure if that's a good idea, or not, just that it could.) But if the module wants to compute on the values in the buffer, at some level it would have to copy the data in/out.
- davexunit 2y agoUse the GC instructions and you can freely share heap references amongst other modules and the host.
- panic 2y agoHow do you access the contents of a heap reference from JavaScript in order to “send it to a <canvas> or similar”?
- davexunit 2y agoAssuming you're talking about reading binary data like (array i8), the GC MVP doesn't have a great answer right now. Have to call back into wasm to read the bytes. Something for the group to address in future proposals. Sharing between wasm modules is better right now.