commit 381a7f9e76d5fd6ee78a45acf146ae5d29117792
author Ross McIlroy <rmcilroy@chromium.org> Wed Apr 24 09:20:56 2019
committer Commit Bot <commit-bot@chromium.org> Wed Apr 24 11:33:37 2019
tree 05c70c4fc0224115f110ce8a18ee287b394164c8
parent c5f5b93d9b05955a2c49dd970a7aa12b2717a88d

[Profiler] Ensure ticks in frameless bytecode handlers are interpreted frames.

On Arm/64 the last return address is stored in a link register instead of
being pushed to the top-of-stack like on x64/ia32. Extend the support in the
tick sampler to check for samples in a frameless bytecode handler with support
for checking the link register if it exists instead of top-of-stack. In addition,
make the x64/ia32 check more robust by ensuring we only apply the change if the
pc is a bytecode handler and the top frame isn't a bytecode handler (stub) frame.

BUG=v8:9162

Change-Id: I89d2e80ea8a0b84ff6a265d0e0e73f9fdd1daca8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1578464
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60976}