deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3 #25429

bcoe · 2019-01-10T08:34:26Z

merge patches related to test coverage:

v8/v8@aac2f8c
v8/v8@9365d09
v8/v8@47d34a3

this should correct some of the oddities seen by @mhdawson in #25157

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
commit message follows commit guidelines

nodejs-github-bot · 2019-01-10T08:34:28Z

@bcoe build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/2218/pipeline

bcoe · 2019-01-10T08:36:25Z

CC: @schuay

mhdawson · 2019-01-10T21:05:42Z

You also need to update 'v8_embedder_string': '-node.10', in common.gypi. Which we bump with each commit backported. I think but I'm not sure that it should actually be bumped twice in the PR once for each of the commits backported but @hashseed can confirm as he does this regularly.

bcoe · 2019-01-12T22:47:50Z

👋 flagged a couple folks who I saw reviewing v8 backports recently (CC: @BridgeAR, @TimothyGu).

This is an attempt to back port some of the work that @hashseed, @schuay, and myself have done in v8 related to test coverage -- the patch didn't apply perfectly, so would love an extra set of eyes to make sure I made reasonable decisions when back porting.

bcoe · 2019-01-12T22:50:38Z

deps/v8/src/ast/source-range-ast-visitor.cc

+
+void SourceRangeAstVisitor::MaybeRemoveLastContinuationRange(
+    ZonePtrList<Statement>* statements) {
+  if (statements == nullptr || statements->is_empty()) return;


statements is sometimes a nullptr, which was leading to a segfault. This does not seem to be possible in the mainline v8; my guess is that a patch that has not been back-ported eliminated the possibility of expr->body() returning a nullptr. It felt like a reasonable stop gap (until we land a fully updated v8) to add the check statements == nullptr.

I think this is the relevant change.

mhdawson · 2019-01-14T23:04:27Z

@hashseed would be great to get your review on this since you made some of the original changes.

mhdawson · 2019-01-14T23:06:34Z

New coverage build with this PR integrated: https://ci.nodejs.org/view/All/job/node-test-commit-linux-coverage-new/3/

hashseed

lgtm!

BridgeAR · 2019-01-15T15:45:19Z

@mhdawson seems like your test build did not start properly. Could you please have another look at it?

addaleax · 2019-01-23T18:51:42Z

Should this be backported to v11.x-staging? If yes please follow the guide and raise a backport PR, if not let me know or add the dont-land-on label.

bcoe · 2019-01-23T19:08:46Z

@addaleax I think this would be worth back-porting; I honestly wonder if we could get away with landing it on v10.x, which would improve the coverage story for it.

addaleax · 2019-01-23T19:09:57Z

@bcoe In that case you or somebody from the V8 team would need to do the work to backport these patches manually (they have merge conflicts on v11.x).

bcoe · 2019-01-23T19:11:55Z

@addaleax okay, I'll make an effort to do so after my block of meetings frees up later this afternoon; will update this conversation here if it looks like the back-port is possible.

Original commit message 9365d09: [coverage] Rework continuation counter handling This changes a few bits about how continuation counters are handled. It introduces a new mechanism that allows removal of a continuation range after it has been created. If coverage is enabled, we run a first post-processing pass on the AST immediately after parsing, which removes problematic continuation ranges in two situations: 1. nested continuation counters - only the outermost stays alive. 2. trailing continuation counters within a block-like structure are removed if the containing structure itself has a continuation. [email protected], [email protected], [email protected] Bug: v8:8381, v8:8539 Change-Id: I6bcaea5060d8c481d7bae099f6db9f993cc30ee3 Reviewed-on: https://chromium-review.googlesource.com/c/1339119 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Leszek Swirski <[email protected]> Reviewed-by: Georg Neis <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#58443} Refs: v8/v8@9365d09 Original commit message aac2f8c: [coverage] Filter out singleton ranges that alias full ranges Block coverage is based on a system of ranges that can either have both a start and end position, or only a start position (so-called singleton ranges). When formatting coverage information, singletons are expanded until the end of the immediate full parent range. E.g. in: {0, 10} // Full range. {5, -1} // Singleton range. the singleton range is expanded to {5, 10}. Singletons are produced mostly for continuation counters that track whether we execute past a specific language construct. Unfortunately, continuation counters can turn up in spots that confuse our post-processing. For example: if (true) { ... block1 ... } else { ... block2 ... } If block1 produces a continuation counter, it could end up with the same start position as the else-branch counter. Since we merge identical blocks, the else-branch could incorrectly end up with an execution count of one. We need to avoid merging such cases. A full range should always take precedence over a singleton range; a singleton range should never expand to completely fill a full range. An additional post-processing pass ensures this. Bug: v8:8237 Change-Id: Idb3ec7b2feddc0585313810b9c8be1e9f4ec64bf Reviewed-on: https://chromium-review.googlesource.com/c/1273095 Reviewed-by: Georg Neis <[email protected]> Reviewed-by: Yang Guo <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#56531} Refs: v8/v8@aac2f8c deps: V8: backport 47d34a3 Original commit message: Revert "[coverage] change block range to avoid ambiguity." This reverts commit 471fef0469d04d7c487f3a08e81f3d77566a2f50. Reason for revert: A more general fix incoming at https://crrev.com/c/1273095. Original change's description: > [coverage] change block range to avoid ambiguity. > > By moving the block range end to left of closing bracket, > we can avoid ambiguity where an open-ended singleton range > could be both interpreted as inside the parent range, or > next to it. > > R=<U+200B>[email protected] > > Bug: v8:8237 > Change-Id: Ibc9412b31efe900b6d8bff0d8fa8c52ddfbf460a > Reviewed-on: https://chromium-review.googlesource.com/1254127 > Reviewed-by: Georg Neis <[email protected]> > Commit-Queue: Yang Guo <[email protected]> > Cr-Commit-Position: refs/heads/master@{#56347} [email protected],[email protected],[email protected] # Not skipping CQ checks because original CL landed > 1 day ago. Bug: v8:8237 Change-Id: I39310cf3c2f06a0d98ff314740aaeefbfffc0834 Reviewed-on: https://chromium-review.googlesource.com/c/1273096 Reviewed-by: Jakob Gruber <[email protected]> Reviewed-by: Toon Verwaest <[email protected]> Reviewed-by: Yang Guo <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#56513} Refs: v8/v8@47d34a3 PR-URL: nodejs#25429 Backport-PR-URL: nodejs#25728 Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Michael Dawson <[email protected]>

Original commit message 9365d09: [coverage] Rework continuation counter handling This changes a few bits about how continuation counters are handled. It introduces a new mechanism that allows removal of a continuation range after it has been created. If coverage is enabled, we run a first post-processing pass on the AST immediately after parsing, which removes problematic continuation ranges in two situations: 1. nested continuation counters - only the outermost stays alive. 2. trailing continuation counters within a block-like structure are removed if the containing structure itself has a continuation. [email protected], [email protected], [email protected] Bug: v8:8381, v8:8539 Change-Id: I6bcaea5060d8c481d7bae099f6db9f993cc30ee3 Reviewed-on: https://chromium-review.googlesource.com/c/1339119 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Leszek Swirski <[email protected]> Reviewed-by: Georg Neis <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#58443} Refs: v8/v8@9365d09 Original commit message aac2f8c: [coverage] Filter out singleton ranges that alias full ranges Block coverage is based on a system of ranges that can either have both a start and end position, or only a start position (so-called singleton ranges). When formatting coverage information, singletons are expanded until the end of the immediate full parent range. E.g. in: {0, 10} // Full range. {5, -1} // Singleton range. the singleton range is expanded to {5, 10}. Singletons are produced mostly for continuation counters that track whether we execute past a specific language construct. Unfortunately, continuation counters can turn up in spots that confuse our post-processing. For example: if (true) { ... block1 ... } else { ... block2 ... } If block1 produces a continuation counter, it could end up with the same start position as the else-branch counter. Since we merge identical blocks, the else-branch could incorrectly end up with an execution count of one. We need to avoid merging such cases. A full range should always take precedence over a singleton range; a singleton range should never expand to completely fill a full range. An additional post-processing pass ensures this. Bug: v8:8237 Change-Id: Idb3ec7b2feddc0585313810b9c8be1e9f4ec64bf Reviewed-on: https://chromium-review.googlesource.com/c/1273095 Reviewed-by: Georg Neis <[email protected]> Reviewed-by: Yang Guo <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#56531} Refs: v8/v8@aac2f8c deps: V8: backport 47d34a3 Original commit message: Revert "[coverage] change block range to avoid ambiguity." This reverts commit 471fef0469d04d7c487f3a08e81f3d77566a2f50. Reason for revert: A more general fix incoming at https://crrev.com/c/1273095. Original change's description: > [coverage] change block range to avoid ambiguity. > > By moving the block range end to left of closing bracket, > we can avoid ambiguity where an open-ended singleton range > could be both interpreted as inside the parent range, or > next to it. > > R=<U+200B>[email protected] > > Bug: v8:8237 > Change-Id: Ibc9412b31efe900b6d8bff0d8fa8c52ddfbf460a > Reviewed-on: https://chromium-review.googlesource.com/1254127 > Reviewed-by: Georg Neis <[email protected]> > Commit-Queue: Yang Guo <[email protected]> > Cr-Commit-Position: refs/heads/master@{#56347} [email protected],[email protected],[email protected] # Not skipping CQ checks because original CL landed > 1 day ago. Bug: v8:8237 Change-Id: I39310cf3c2f06a0d98ff314740aaeefbfffc0834 Reviewed-on: https://chromium-review.googlesource.com/c/1273096 Reviewed-by: Jakob Gruber <[email protected]> Reviewed-by: Toon Verwaest <[email protected]> Reviewed-by: Yang Guo <[email protected]> Commit-Queue: Jakob Gruber <[email protected]> Cr-Commit-Position: refs/heads/master@{#56513} Refs: v8/v8@47d34a3 PR-URL: #25429 Backport-PR-URL: #25728 Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Michael Dawson <[email protected]> Reviewed-By: Anna Henningsen <[email protected]>

bcoe added the c++ Issues and PRs that require attention from people who are familiar with C++. label Jan 10, 2019

bcoe requested review from addaleax and mhdawson January 10, 2019 08:34

nodejs-github-bot added the v8 engine Issues and PRs related to the V8 dependency. label Jan 10, 2019

bcoe removed the c++ Issues and PRs that require attention from people who are familiar with C++. label Jan 10, 2019

bcoe requested a review from hashseed January 10, 2019 08:36

bcoe changed the title ~~deps: V8: backport 9365d09, aac2f8c~~ [WIP] deps: V8: backport 9365d09, aac2f8c Jan 10, 2019

bcoe force-pushed the float-coverage-patch branch from 62941f8 to 56aaecc Compare January 12, 2019 01:30

bcoe changed the title ~~[WIP] deps: V8: backport 9365d09, aac2f8c~~ deps: V8: backport 9365d09, aac2f8c Jan 12, 2019

bcoe force-pushed the float-coverage-patch branch from 56aaecc to d4577e4 Compare January 12, 2019 22:37

bcoe requested review from BridgeAR and TimothyGu January 12, 2019 22:41

bcoe commented Jan 12, 2019

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bcoe force-pushed the float-coverage-patch branch from d4577e4 to 28ccf19 Compare January 13, 2019 02:37

bcoe changed the title ~~deps: V8: backport 9365d09, aac2f8c~~ deps: cherry-pick 9365d09, aac2f8c from upstream V8 Jan 13, 2019

bcoe changed the title ~~deps: cherry-pick 9365d09, aac2f8c from upstream V8~~ deps: cherry-pick 9365d09, aac2f8c from V8 Jan 13, 2019

bcoe changed the title ~~deps: cherry-pick 9365d09, aac2f8c from V8~~ deps: cherry-pick 9365d09, aac2f8c from v8 Jan 13, 2019

bcoe changed the title ~~deps: cherry-pick 9365d09, aac2f8c from v8~~ deps: cherry-pick 9365d09, aac2f8c from V8 Jan 13, 2019

bcoe added the test Issues and PRs related to the tests. label Jan 13, 2019

bcoe force-pushed the float-coverage-patch branch 2 times, most recently from a6d6939 to 8b58ffe Compare January 14, 2019 21:48

hashseed approved these changes Jan 15, 2019

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bcoe force-pushed the float-coverage-patch branch from 8b58ffe to 7657903 Compare January 15, 2019 20:00

sam-github mentioned this pull request Jan 18, 2019

V8 test failure on PPC - recent backport? #25540

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addaleax added the backport-requested-v11.x label Jan 23, 2019

bcoe mentioned this pull request Jan 26, 2019

[v11.x backport] deps: v8, cherry-pick 9365d09 #25728

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targos added backported-to-v11.x and removed backport-requested-v11.x labels Jan 30, 2019

targos mentioned this pull request Feb 14, 2019

v11.10.0 proposal #26098

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bcoe mentioned this pull request Mar 14, 2019

[v10.x backport] deps: v8, backport coverage fixes #26579

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[Snyk] Security upgrade gatsby from 2.18.18 to 2.23.20 Rednickle/node-1#4

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deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3 #25429

deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3 #25429

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deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3 #25429

deps: v8, cherry-pick 9365d09, aac2f8c, 47d34a3 #25429

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