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util: use proper circular reference checking #14790

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util: use proper circular reference checking #14790

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addaleax
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Circular references are conceptually nothing that should be checked for objects (or Sets or Maps) only, but applies to recursive structures in general, so move the seen checks into a position where it is part of the recursion itself.

Fixes: #14758

Tests are taken from #14775

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

util

@BridgeAR @TimothyGu @not-an-aardvark @aqrln

@nodejs-github-bot nodejs-github-bot added the util Issues and PRs related to the built-in util module. label Aug 12, 2017
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CI: https://ci.nodejs.org/job/node-test-commit/11725/

aqrln
aqrln approved these changes Aug 12, 2017
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lib/util.js Outdated

var output = formatter(ctx, value, recurseTimes, visibleKeys, keys);
var output = formatter(ctx, value, recurseTimes, visibleKeys, keys);
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Tiny nit: const since the line is being changed anyway.

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Done!

@addaleax addaleax force-pushed the util-inspect-map-recurse branch from f281467 to 013eca8 Compare August 12, 2017 19:28
@BridgeAR BridgeAR mentioned this pull request Aug 13, 2017
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TimothyGu
TimothyGu approved these changes Aug 13, 2017
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LGTM with a question.

lib/util.js Outdated
@@ -613,13 +613,18 @@ function formatValue(ctx, value, recurseTimes) {
}
}

ctx.seen.push(value);
// TODO(addaleax): Make `seen` a Set to avoid linear-time lookup.
if (ctx.seen.includes(value)) {
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I assume value can only ever be an object here?

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Yes. Or maybe that depends on what you mean by “object”; at least it’s not a primitive.

evanlucas
evanlucas approved these changes Aug 14, 2017
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LGTM with a nit (take it or leave it) :]

lib/util.js Outdated
// TODO(addaleax): Make `seen` a Set to avoid linear-time lookup.
if (ctx.seen.includes(value)) {
return ctx.stylize('[Circular]', 'special');
} else {
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any reason to add the else here? The diff would be smaller without it. Just a nit though

@BridgeAR BridgeAR mentioned this pull request Aug 17, 2017
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addaleax and others added 2 commits August 17, 2017 20:17
@addaleax
util: use proper circular reference checking
0d019fa 
Circular references are conceptually nothing that should be checked
for objects (or Sets or Maps) only, but applies to recursive structures
in general, so move the `seen` checks into a position where it is part
of the recursion itself.

Fixes: nodejs#14758
PR-URL: nodejs#14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben.bridgewater@fintura.de>
@BridgeAR @addaleax
test: check util.inspect circular Set and Map refs
98c0a47 
Ref: nodejs#14775
PR-URL: nodejs#14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@addaleax addaleax force-pushed the util-inspect-map-recurse branch from 013eca8 to 98c0a47 Compare August 17, 2017 18:19
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addaleax commented Aug 17, 2017 •
edited
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Landed in 0d019fa, 98c0a47 859a228, f853baf

@addaleax addaleax closed this Aug 17, 2017
@addaleax addaleax deleted the util-inspect-map-recurse branch August 17, 2017 18:21
addaleax added a commit that referenced this pull request Aug 17, 2017
@addaleax
util: use proper circular reference checking
859a228 
Circular references are conceptually nothing that should be checked
for objects (or Sets or Maps) only, but applies to recursive structures
in general, so move the `seen` checks into a position where it is part
of the recursion itself.

Fixes: #14758
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben.bridgewater@fintura.de>
addaleax pushed a commit that referenced this pull request Aug 17, 2017
@BridgeAR @addaleax
test: check util.inspect circular Set and Map refs
f853baf 
Ref: #14775
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
MylesBorins pushed a commit that referenced this pull request Sep 10, 2017
@addaleax @MylesBorins
util: use proper circular reference checking
e97f7f3 
Circular references are conceptually nothing that should be checked
for objects (or Sets or Maps) only, but applies to recursive structures
in general, so move the `seen` checks into a position where it is part
of the recursion itself.

Fixes: #14758
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben.bridgewater@fintura.de>
MylesBorins pushed a commit that referenced this pull request Sep 10, 2017
@BridgeAR @MylesBorins
test: check util.inspect circular Set and Map refs
c0e7344 
Ref: #14775
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@MylesBorins MylesBorins mentioned this pull request Sep 10, 2017
Merged
MylesBorins pushed a commit that referenced this pull request Sep 12, 2017
@addaleax @MylesBorins
util: use proper circular reference checking
c3c6cb1 
Circular references are conceptually nothing that should be checked
for objects (or Sets or Maps) only, but applies to recursive structures
in general, so move the `seen` checks into a position where it is part
of the recursion itself.

Fixes: #14758
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben.bridgewater@fintura.de>
MylesBorins pushed a commit that referenced this pull request Sep 12, 2017
@BridgeAR @MylesBorins
test: check util.inspect circular Set and Map refs
4f49ae5 
Ref: #14775
PR-URL: #14790
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
@MylesBorins
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Should this be backported to v6.x-staging? If yes please follow the guide and raise a backport PR, if no let me know or add the dont-land-on label.

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@BridgeAR BridgeAR BridgeAR approved these changes

@aqrln aqrln aqrln approved these changes

@hiroppy hiroppy hiroppy approved these changes

@tniessen tniessen tniessen approved these changes

@cjihrig cjihrig cjihrig approved these changes

@TimothyGu TimothyGu TimothyGu approved these changes

@evanlucas evanlucas evanlucas approved these changes

@jasnell jasnell jasnell approved these changes

@refack refack refack approved these changes

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