1897809 - Enable JIT exit for JS PI

Status: RESOLVED FIXED

(Core :: JavaScript: WebAssembly, task, P2)

Description

[Yury Delendik (:yury)]

Currently, when Wasm JS Promise Integration is enabled, the JIT exit optimization is disabled. The main issue that we need to track if execution is happening on the main (not suspendable) stack, and switch stacks otherwise.

Comment 1

[Ryan Hunt [:rhunt]]

I think we'll need to expand our JIT exit code so that performs an optional stack switch to the main stack. It'd be nice if the masm/stubs code we add for this was general enough that we could re-use it for our interpreter exit code too. This would let us have remove the inline assembly and solve bug 1894759. I'm a little worried that inline assembly is going to be hard to maintain, as it requires us to duplicate a lot of logic that we already have in masm.

Comment 2

[Yury Delendik (:yury)]

Attachment: Bug 1897809 - Enable JIT exit for JSPI. r?rhunt

Comment 3

[Yury Delendik (:yury)]

Attachment: Bug 1897809 - Change namespace for X86 specific AssemblerBuffer. r?jandem

Avoids collision of two different js::jit::AssemblerBuffer's.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/309324abbc48
Change namespace for X86 specific AssemblerBuffer. r=jandem
https://hg.mozilla.org/integration/autoland/rev/fe319ced93e9
Enable JIT exit for JSPI. r=rhunt

Comment 5

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/309324abbc48
https://hg.mozilla.org/mozilla-central/rev/fe319ced93e9