Inside the instance there are wasm globals (emscripten doesn't make heavy use of them but they exist) and the indirect function table.
On the JS there are a lot of potential things... but it sounds like you are planning to avoid them so maybe it won't be an issue for you. On Sat, Dec 17, 2022 at 1:58 PM Steve Dekorte <st...@dekorte.com> wrote: > > For my use case, I only want to use HTML/JS to start WASM and hand it a > canvas and events. Things like i/o contexts would have to be reconstructed > if possible. Is there anything else? > > On Dec 17, 2022, at 1:40 PM, 'Sam Clegg' via emscripten-discuss < > emscripten-discuss@googlegroups.com> wrote: > > > Neat! That might work for the linear memory, but as I said in an earlier > reply there is more to the state of a running module than just its memory. > > On Sat, Dec 17, 2022 at 10:40 AM Steve Dekorte <st...@dekorte.com> wrote: > >> >> Just for fun, I tried asking ChatGPT: >> >> [[Please write some Javascript code which stores the state of a >> WebAssembly instance to a byte array.]] >> >> // First, create a WebAssembly instance and obtain a reference to its >> memory object >> const wasmInstance = new WebAssembly.Instance(wasmModule); >> const memory = wasmInstance.exports.memory; >> >> // Next, create a JavaScript typed array to hold the contents of the >> memory object >> const memoryArray = new Uint8Array(memory.buffer); >> >> // Finally, use the copy method to copy the contents of the memory object >> to the typed array >> memory.copy(memoryArray); >> >> [[Thanks. Could you also write some Javascript code which creates a new >> WebAssembly instance and uses this byte array to restore the previous >> state?]] >> >> // First, create a WebAssembly module using the WebAssembly.compile >> function >> const wasmModule = await WebAssembly.compile(wasmCode); >> >> // Next, create a new WebAssembly instance and obtain a reference to its >> memory object >> const wasmInstance = new WebAssembly.Instance(wasmModule); >> const memory = wasmInstance.exports.memory; >> >> // Use the copy method to copy the contents of the byte array into the >> memory object of the WebAssembly instance >> memory.copy(byteArray); >> >> // Now, the WebAssembly instance has been restored to the previous state >> >> //...It is important to note that the byte array must be the same size as >> the memory object of the WebAssembly instance, and it must contain a valid >> snapshot of the state of the WebAssembly instance. If the byte array is not >> the correct size or does not contain a valid snapshot, the WebAssembly >> instance may not be restored correctly. >> >> I haven’t had a chance to give it a try yet. Does it look reasonable? >> >> Steve >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to emscripten-discuss+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/f1967bf2cf0d44dc90bd7557a64839f4%40smtp.hushmail.com >> . >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "emscripten-discuss" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/emscripten-discuss/-b2JbVbsfo4/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > emscripten-discuss+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/CAL_va28VFRxNwFGv2R6f2rDhYpTie0e8Pie%3Dt5hb4y2G5%3Dgzzw%40mail.gmail.com > <https://groups.google.com/d/msgid/emscripten-discuss/CAL_va28VFRxNwFGv2R6f2rDhYpTie0e8Pie%3Dt5hb4y2G5%3Dgzzw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to emscripten-discuss+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/305a50dba3817de2b1b876b9ca9a1a58%40smtp.hushmail.com > <https://groups.google.com/d/msgid/emscripten-discuss/305a50dba3817de2b1b876b9ca9a1a58%40smtp.hushmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to emscripten-discuss+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/CAL_va2_Uu4Ec6UdnnS2EBRUTEDbpu4%3Dk2VUUPq8d3mYTN6zcBg%40mail.gmail.com.
