168264 2017-02-13 16:14:09 -0800 WebAssembly: make code position independent 2017-04-13 19:12:02 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 169611 169773 170207 170210 170261 170312 170488 170573 170632 166480 166481 1 jfbastien saam fpizlo ggaren jfbastien keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1276424 0 jfbastien 2017-02-13 16:14:09 -0800 We'll want to be able to save a WebAssembly.Module's code in IndexDB (#166481) and postMessage (#166480) the WebAssembly.Module cheaply to other workers without having to patch pointers and duplicate physical pages used for code. This allows us to instantiate the same module waaayyy better. Right now our implementation has some pointers baked in: &VM.topInstance, and functions for back traces. We'll want to do away with this. The easiest and fastest thing is probably to store the topInstance in a TLS slot, and then change it when entering js->wasm, doing wasm->wasm calls, and when in a worker (nothing to do here really, it's the same mechanism). 1287325 1 jfbastien 2017-03-13 13:59:17 -0700 There's also code in the trap handling which needs to be updated. It has ([codebegin, codeend) + VM) structures, and the signal handlers have thunks. 1292644 2 webkit-bug-importer 2017-03-29 17:23:38 -0700 <rdar://problem/31335594> 1297272 3 saam 2017-04-13 19:12:02 -0700 This is done as of: https://trac.webkit.org/changeset/215353/webkit