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Possible bug: instanceof evaluates to true in Node 4 but not Node 6 #7592

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ghost opened this issue Jul 7, 2016 · 11 comments
Closed

Possible bug: instanceof evaluates to true in Node 4 but not Node 6 #7592

ghost opened this issue Jul 7, 2016 · 11 comments
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v8 engine Issues and PRs related to the V8 dependency.

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@ghost
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ghost commented Jul 7, 2016 •
edited by ghost
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  • Version: 6.3.0:
  • Platform: Darwin 15.5.0 Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64 x86_64:
  • Subsystem:

In Node 4, the last statement evaluates to true, but in Node 6 it evaluates to false. Is this a bug?

F = () => {};
F.prototype = {};
Object.create(F.prototype) instanceof F;

Another user verified the behavior on their Windows system: http://stackoverflow.com/questions/38253656/instanceof-evaluates-to-true-in-node-4-but-not-node-6
@mscdex mscdex added the v8 engine Issues and PRs related to the V8 dependency. label Jul 7, 2016
@mscdex
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mscdex commented Jul 7, 2016

/cc @nodejs/v8

@mscdex
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mscdex commented Jul 7, 2016

I should note that it returns true in master.

@bnoordhuis
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Looks like a bug to me. v7.0.0-pre (V8 5.1) returns true, which is what I would expect.

@Trott
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Trott commented Jul 7, 2016

All Node.js version 6.x releases that I tried returned the surprising false including 6.0.0.

Version 5.12.0 returned true.

So this would seem to be either a bug in the V8 that shipped with Node.js v6.x or (less likely, I imagine, but still possible) a bug in a patch that we are only floating in v6.x. (I'm not even sure there are any that are in 6.x but not in 5.x or current master.)

@fhinkel
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fhinkel commented Jul 7, 2016

In d8 version 5.0.71.54 it returns false. So not related to floating patches.

@fhinkel
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fhinkel commented Jul 8, 2016

This is the commit that fixed it: https://codereview.chromium.org/1810953002/

The patch applies clean on v6.x and fixes this issue. Do we want to float the patch on v6.x or just wait because it's fixed in V8 5.1 anyways?

@Trott
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Trott commented Jul 8, 2016

/cc @nodejs/lts Not strictly an LTS question/issue, but I suspect they'll have an opinion on @fhinkel's question.

@MylesBorins
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Another patch was recently back ported to 5.1 by @bnoordhuis

There is going to be a discussion about maintaining lts release streams directly from V8 to avoid floating patches. Aiming for 6 am estwif anyone wants to join.

@bnoordhuis
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I'm all for back-porting patches that apply cleanly or with minimal wedging.

@fhinkel I see you've done the work already. If you file a pull request and cc me, I'll review it.

@fhinkel fhinkel mentioned this issue Jul 9, 2016
Closed
3 tasks
fhinkel added a commit to fhinkel/node that referenced this issue Jul 21, 2016
@fhinkel
deps: cherry-pick 2aa070be from V8 upstream
ca51390 
Original commit message:

    InstanceOfStub incorrectly interprets the hole as a prototype.

    Repair this to match what the runtime correctly does, by first
    checking if the function is a constructor before we access the
    prototype.

    R=verwaest@chromium.org

    BUG=

    Committed: https://crrev.com/2aa070be4fd2960df98905b254f12ed801ef26cd

    Cr-Commit-Position: refs/heads/master@{nodejs#34863}

This fixes the behavior of instanceof when the second parameter is not a
constructor.

Fixes: nodejs#7592
fhinkel added a commit to fhinkel/node that referenced this issue Jul 21, 2016
@fhinkel
deps: cherry-pick 3a903c4 for PPC from V8 upstream
e06e255 
Original commit message:

    PPC: InstanceOfStub incorrectly interprets the hole as a prototype.
    Port 2aa070b

    Original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
    michael_dawson@ca.ibm.com

    BUG=

    Review URL: https://codereview.chromium.org/1811013002

    Cr-Commit-Position: refs/heads/master@{nodejs#34869}

Fixes: nodejs#7592 for PPC
fhinkel added a commit to fhinkel/node that referenced this issue Jul 21, 2016
@fhinkel
deps: cherry-pick 5b5d24b for X87 from V8 upstream
f007c0a 
Original commit message:

    port 2aa070b (r34863)

    original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    BUG=

    Review URL: https://codereview.chromium.org/1809333002

    Cr-Commit-Position: refs/heads/master@{nodejs#34880}

Fixes: nodejs#7592 for X87
fhinkel added a commit to fhinkel/node that referenced this issue Jul 21, 2016
@fhinkel
test: add regression test for instanceof
ef9092b 
See issue nodejs#7592.
evanlucas pushed a commit that referenced this issue Jul 21, 2016
@fhinkel @evanlucas
deps: cherry-pick 2aa070be from V8 upstream
e239045 
Original commit message:

    InstanceOfStub incorrectly interprets the hole as a prototype.

    Repair this to match what the runtime correctly does, by first
    checking if the function is a constructor before we access the
    prototype.

    R=verwaest@chromium.org

    BUG=

    Committed: https://crrev.com/2aa070be4fd2960df98905b254f12ed801ef26cd

    Cr-Commit-Position: refs/heads/master@{#34863}

This fixes the behavior of instanceof when the second parameter is not a
constructor.

Fixes: #7592
PR-URL: #7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
evanlucas pushed a commit that referenced this issue Jul 21, 2016
@fhinkel @evanlucas
deps: cherry-pick 3a903c4 for PPC from V8 upstream
e5cce7a 
Original commit message:

    PPC: InstanceOfStub incorrectly interprets the hole as a prototype.
    Port 2aa070b

    Original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
    michael_dawson@ca.ibm.com

    BUG=

    Review URL: https://codereview.chromium.org/1811013002

    Cr-Commit-Position: refs/heads/master@{#34869}

Fixes: #7592 for PPC
PR-URL: #7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
evanlucas pushed a commit that referenced this issue Jul 21, 2016
@fhinkel @evanlucas
deps: cherry-pick 5b5d24b for X87 from V8 upstream
2870061 
Original commit message:

    port 2aa070b (r34863)

    original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    BUG=

    Review URL: https://codereview.chromium.org/1809333002

    Cr-Commit-Position: refs/heads/master@{#34880}

Fixes: #7592 for X87
PR-URL: #7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
evanlucas pushed a commit that referenced this issue Jul 21, 2016
@fhinkel @evanlucas
test: add regression test for instanceof
44c9a72 
Ref: #7592.
PR-URL: #7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
@fhinkel
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fhinkel commented Jul 22, 2016

Fixed in #7638.

Can we close this?

@addaleax
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Yup, works as expected in 6.3.1. Thanks for taking care of this!

BethGriggs pushed a commit to ibmruntimes/node that referenced this issue Jul 22, 2016
@fhinkel @BethGriggs
deps: cherry-pick 2aa070be from V8 upstream
7963103 
Original commit message:

    InstanceOfStub incorrectly interprets the hole as a prototype.

    Repair this to match what the runtime correctly does, by first
    checking if the function is a constructor before we access the
    prototype.

    R=verwaest@chromium.org

    BUG=

    Committed: https://crrev.com/2aa070be4fd2960df98905b254f12ed801ef26cd

    Cr-Commit-Position: refs/heads/master@{#34863}

This fixes the behavior of instanceof when the second parameter is not a
constructor.

Fixes: nodejs/node#7592
PR-URL: nodejs/node#7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
BethGriggs pushed a commit to ibmruntimes/node that referenced this issue Jul 22, 2016
@fhinkel @BethGriggs
deps: cherry-pick 3a903c4 for PPC from V8 upstream
3d4d0db 
Original commit message:

    PPC: InstanceOfStub incorrectly interprets the hole as a prototype.
    Port 2aa070b

    Original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    R=mvstanton@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
    michael_dawson@ca.ibm.com

    BUG=

    Review URL: https://codereview.chromium.org/1811013002

    Cr-Commit-Position: refs/heads/master@{#34869}

Fixes: nodejs/node#7592 for PPC
PR-URL: nodejs/node#7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
BethGriggs pushed a commit to ibmruntimes/node that referenced this issue Jul 22, 2016
@fhinkel @BethGriggs
deps: cherry-pick 5b5d24b for X87 from V8 upstream
1521a0c 
Original commit message:

    port 2aa070b (r34863)

    original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    BUG=

    Review URL: https://codereview.chromium.org/1809333002

    Cr-Commit-Position: refs/heads/master@{#34880}

Fixes: nodejs/node#7592 for X87
PR-URL: nodejs/node#7638
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
richardlau added a commit to ibmruntimes/node that referenced this issue Aug 15, 2016
@richardlau
deps: cherry-pick 71d525a for S390 from V8 upstream
d051e78 
Original commit message:

    S390: InstanceOfStub incorrectly interprets the hole as a prototype.
    Port 2aa070b

    Original commit message:
        Repair this to match what the runtime correctly does,
        by first checking if the function is a constructor
        before we access the prototype.

    R=mvstanton@chromium.org, joransiu@ca.ibm.com,
    michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

    BUG=

    Review URL: https://codereview.chromium.org/1813003002

    Cr-Commit-Position: refs/heads/master@{#34872}

Fixes: nodejs/node#7592 for S390
@fhinkel fhinkel mentioned this issue Oct 19, 2016
Closed
3 tasks
fhinkel added a commit to fhinkel/node that referenced this issue Oct 20, 2016
@fhinkel
test: add regression test for instanceof
f376ad4 
Add regression test for issue nodejs#7592.
The issue was fixed in upstream V8 and this test case was
previously added with a manual cherry pick for v6.x.

Related to: nodejs#7638 and
nodejs#7592.
fhinkel added a commit that referenced this issue Oct 20, 2016
@fhinkel
test: add regression test for instanceof
8f8f031 
Add regression test for issue
#7592.
The issue was fixed in upstream V8 and this test case was
previously added with a manual cherry pick for v6.x.

Related to: #7638 and
#7592.

PR-URL: #9178
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
jasnell pushed a commit that referenced this issue Oct 20, 2016
@fhinkel @jasnell
test: add regression test for instanceof
d62e7bd 
Add regression test for issue
#7592.
The issue was fixed in upstream V8 and this test case was
previously added with a manual cherry pick for v6.x.

Related to: #7638 and
#7592.

PR-URL: #9178
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
MylesBorins pushed a commit that referenced this issue Nov 15, 2016
@fhinkel
test: add regression test for instanceof
a038fcc 
Add regression test for issue
#7592.
The issue was fixed in upstream V8 and this test case was
previously added with a manual cherry pick for v6.x.

Related to: #7638 and
#7592.

PR-URL: #9178
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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@mscdex @fhinkel @bnoordhuis @MylesBorins @Trott @addaleax