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[v10.x-staging] v8: fix load elimination liveness checks #31613

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This commit back-ports the implementations of IsRename() and MayAlias()
from the upstream 8.0 branch wholesale. Fixes several bugs where V8's
load elimination pass considered values to be alive when they weren't.

Fixes: #31484

Supersedes #31507.

This commit back-ports the implementations of IsRename() and MayAlias()
from the upstream 8.0 branch wholesale. Fixes several bugs where V8's
load elimination pass considered values to be alive when they weren't.

Fixes: nodejs#31484
@nodejs-github-bot nodejs-github-bot added v10.x v8 engine Issues and PRs related to the V8 dependency. labels Feb 2, 2020
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bnoordhuis commented Feb 2, 2020

https://ci.nodejs.org/job/node-test-commit-v8-linux/2835/ - although previous runs suggest the V8 in v10.x doesn't build standalone on all buildbots anymore. To be clear: not caused by this PR.

https://ci.nodejs.org/job/node-test-commit-v8-linux/2836/ - v10.x-staging, for comparison.

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As the reporter of #31484 I tried out this patch and I am no longer seeing crashes.

@bnoordhuis bnoordhuis added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 18, 2020
BethGriggs pushed a commit that referenced this pull request Feb 26, 2020
This commit back-ports the implementations of IsRename() and MayAlias()
from the upstream 8.0 branch wholesale. Fixes several bugs where V8's
load elimination pass considered values to be alive when they weren't.

Fixes: #31484

PR-URL: #31613
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Beth Griggs <[email protected]>
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Landed in dc61e09

@BethGriggs BethGriggs closed this Feb 26, 2020
@BethGriggs BethGriggs mentioned this pull request Mar 12, 2020
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5 participants