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Simon Zünd authored
Doc: https://bit.ly/revive-restart-frame Context: https://crrev.com/c/3582395 (jumbo CL with the whole feature) This CL adds a new builtin called "RestartFrameTrampoline". This trampoline is relatively simple: It leaves the current frame and re-invokes the function. This essentially restarts the function and is one of the key components required to bring back the "Restart frame" DevTools debugging feature. The builtin is closely related to the "FrameDropperTrampoline" removed in the CL https://crrev.com/c/2854750. The key difference is that the "FrameDropperTrampoline" dropped to an "arbitrary" frame pointer before restarting the function (arbitrary in the sense that it was provided as an argument). This caused issues as the feature was implemented in a way that the frame pointer wasn't necessarily valid anymore. In comparison, the "RestartFrameTrampoline" relies on the V8 unwinder to drop it in the correct frame first and is then invoked via either the CEntry stub or the deoptimizer (see design doc for details). Bug: chromium:1303521 Change-Id: I7bd46620808f8694c2c776b8bcd267e525d5b581 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3585944 Commit-Queue: Simon Zünd <szuend@chromium.org> Reviewed-by: Tobias Tebbi <tebbi@chromium.org> Reviewed-by: Nico Hartmann <nicohartmann@chromium.org> Cr-Commit-Position: refs/heads/main@{#80254}
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