#21549: Investigate wasm for linkability/fingerprintability/disk avoidance issues -------------------------------------------------+------------------------- Reporter: gk | Owner: tbb- | team Type: task | Status: new Priority: Very High | Milestone: Component: Applications/Tor Browser | Version: Severity: Normal | Resolution: Keywords: ff68-esr, tbb-9.0, | Actual Points: TorBrowserTeam201910 | Parent ID: | Points: 1 Reviewer: | Sponsor: | Sponsor44-can -------------------------------------------------+-------------------------
Comment (by sysrqb): Okay, I started from the beginning, and then worked backwards :) This was tedious because most of the initial patches were simply refactoring asmjs compiler code such that the code could be shared with wasm. Reading these patches was helpful except the code has significantly changed since four years ago (and wasm has mostly replaced asmjs in the codebase now). As an example, the compiler cached asmjs code until earlier this year. I'm taking a different approach now, but I'll post this anyway. The next comments will be based on the current implementation. https://bugzilla.mozilla.org/show_bug.cgi?id=1188259 - Meta ticket of implementing wasm https://bugzilla.mozilla.org/show_bug.cgi?id=1224389 - Odin: refactor in preparation for WebAssembly decoder Commits: - f7c5ebaa664b0dc07836fe06d3609e239ba7e71a - okay - Mostly refactoring - 4ef42db6e3cad192ccefaacc823aab012a57c6e5 - okay - Mostly code simplification - 28f2c8f11d211e30e1f0fb77902c9ba4d2a7d1c5 - - Check JS::AsmJSCache_QuotaExceeded, LookupAsmJSModuleInCache - https://bugzilla.mozilla.org/show_bug.cgi?id=1516697 - Remove the implementation of the asm.js caching mechanism. - masm.loadAsmJSHeapRegisterFromGlobalData is isolated? https://bugzilla.mozilla.org/show_bug.cgi?id=1232205 - wasm:Baseline JIT Commits: - 9e9fafcd38f7e3ec3db1d4508bf4230a2d4b3678 - okay - 8938a215ec16a20f9fa4f4156d9bd611e8fa8562 - okay - 5f37b8277391842f5e56c211c3ca4acd86237d72 - okay - 8ec23c07dd09da1e46bf17f05ecad83f8aa12e4e - okay - 9af7246a474bb824f39562b68e5f7fae0921a8d9 - okay - All refactoring and JIT impl, no caching - 136c1d78af1bf603c4bcd2fc2488d3c3f9661569 - okay - Adds mechanism for running baseline wasm tests - 65b0869d9e684d486c1ac4cf90c60bf3dfc22c82 - okay - Adds test directive - 2a5c7f48c92c2163b9f69ebc9f287c7ae8db7c7c - - Baseline JIT impl. - Pushes code onto masm stack? Is this masm stack isolated? - ffiCall? WasmTableCallPtrReg? - bd9aa07076b543051bcfbd8937c32a9ad2bec883 - okay - Add pref and jsshell runtime arg -- Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21549#comment:30> Tor Bug Tracker & Wiki <https://trac.torproject.org/> The Tor Project: anonymity online
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