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cli: add --trace-uncaught flag #30025

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cli: add --trace-uncaught flag #30025

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addaleax
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Add a flag that makes Node.js print the stack trace at the
time of throwing uncaught exceptions, rather than at the
creation of the Error object, if there is any.

This is disabled by default because it affects GC behavior.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@addaleax
cli: add --trace-uncaught flag
ce0bc30 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Oct 18, 2019
@addaleax addaleax added cli Issues and PRs related to the Node.js command line interface. errors Issues and PRs related to JavaScript errors originated in Node.js core. semver-minor PRs that contain new features and should be released in the next minor version. labels Oct 18, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/26094/

@gireeshpunathil
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@addaleax - can you please throw more light on what behavior change it causes to gc?

@addaleax
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@gireeshpunathil As far as I could tell, it makes functions keep alive stack frames which in turn keep objects that were present in those stack frames alive -- V8 doesn't really document this or what other impact it might have.

You can try it for yourself by enabling this flag by default and running the test suite, some tests that use GC will fail.

@gireeshpunathil
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@addaleax - I ran the gc tests, but did not see any failures (in osx).

Probably this is not a cause of worry for real applications (that do not depend on exact timing and order of objects being collected)?

@addaleax
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addaleax commented Oct 19, 2019 •
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@gireeshpunathil

$ ./node --expose-gc --trace-uncaught test/parallel/test-zlib-invalid-input-memory.js
Mismatched noop function calls. Expected exactly 1, actual 0.
    at Object.mustCall (/home/sqrt/src/node/test/common/index.js:337:10)
    at Object.<anonymous> (/home/sqrt/src/node/test/parallel/test-zlib-invalid-input-memory.js:11:21)
[...]

I think static functions that hold on to dynamic data that was passed to them qualifies as a memory leak (even if its size is limited), and I wouldn’t feel comfortable turning this flag on by default (at least not without further research).

@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Oct 21, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/26134/

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danbev commented Oct 22, 2019

Landed in 31217a8.

@danbev danbev closed this Oct 22, 2019
danbev pushed a commit that referenced this pull request Oct 22, 2019
@addaleax @danbev
cli: add --trace-uncaught flag
31217a8 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
MylesBorins pushed a commit that referenced this pull request Oct 23, 2019
@addaleax @MylesBorins
cli: add --trace-uncaught flag
51185ee 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
MylesBorins pushed a commit that referenced this pull request Oct 23, 2019
@addaleax @MylesBorins
cli: add --trace-uncaught flag
5ca5864 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
targos added a commit that referenced this pull request Nov 5, 2019
@targos
2019-11-05, Version 13.1.0 (Current)
64eacd8 
Notable changes:

* cli:
  * Added a new flag (`--trace-uncaught`) that makes Node.js print the
    stack trace at the time of throwing uncaught exceptions, rather than
    at the creation of the `Error` object, if there is any. This is
    disabled by default because it affects GC behavior.
    #30025
* crypto
  * Added `Hash.prototype.copy()` method. It returns a new `Hash` object
    with its internal state cloned from the original one.
    #29910
* dgram
  * Added source-specific multicast support. This adds methods to
    Datagram sockets to support RFC 4607
    (https://tools.ietf.org/html/rfc4607) for IPv4 and IPv6.
    #15735
* fs
  * Added a `bufferSize` option to `fs.opendir()`. It allows to control
    the number of entries that are buffered internally when reading from
    the directory. #30114
* meta
  * Added Chengzhong Wu (https://github.com/legendecas) to
    collaborators. #30115

PR-URL: #30262
@targos targos mentioned this pull request Nov 5, 2019
Merged
targos added a commit that referenced this pull request Nov 5, 2019
@targos
2019-11-05, Version 13.1.0 (Current)
309e1ea 
Notable changes:

* cli:
  * Added a new flag (`--trace-uncaught`) that makes Node.js print the
    stack trace at the time of throwing uncaught exceptions, rather than
    at the creation of the `Error` object, if there is any. This is
    disabled by default because it affects GC behavior.
    #30025
* crypto
  * Added `Hash.prototype.copy()` method. It returns a new `Hash` object
    with its internal state cloned from the original one.
    #29910
* dgram
  * Added source-specific multicast support. This adds methods to
    Datagram sockets to support RFC 4607
    (https://tools.ietf.org/html/rfc4607) for IPv4 and IPv6.
    #15735
* fs
  * Added a `bufferSize` option to `fs.opendir()`. It allows to control
    the number of entries that are buffered internally when reading from
    the directory. #30114
* meta
  * Added Chengzhong Wu (https://github.com/legendecas) to
    collaborators. #30115

PR-URL: #30262
targos pushed a commit that referenced this pull request Jan 8, 2020
@addaleax @targos
cli: add --trace-uncaught flag
1f349e7 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
targos pushed a commit that referenced this pull request Jan 8, 2020
@addaleax @targos
cli: add --trace-uncaught flag
e08c008 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@targos targos mentioned this pull request Jan 15, 2020
Closed
BethGriggs pushed a commit that referenced this pull request Feb 6, 2020
@addaleax @BethGriggs
cli: add --trace-uncaught flag
dc58731 
Add a flag that makes Node.js print the stack trace at the
time of *throwing* uncaught exceptions, rather than at the
creation of the `Error` object, if there is any.

This is disabled by default because it affects GC behavior.

PR-URL: #30025
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@MylesBorins MylesBorins mentioned this pull request Feb 8, 2020
Merged
targos pushed a commit that referenced this pull request Feb 11, 2020
@MylesBorins @targos
2020-02-11, Version 12.16.0 'Erbium' (LTS)
d20e494 
Notable changes:

New assert APIs

The `assert` module now provides experimental `assert.match()` and
`assert.doesNotMatch()` methods. They will validate that the first argument is a
string and matches (or does not match) the provided regular expression

This is an experimental feature.

Ruben Bridgewater [#30929](#30929).

Advanced serialization for IPC

The `child_process` and `cluster` modules now support a `serialization` option
to change the serialization mechanism used for IPC. The option can have one of
two values:

* `'json'` (default): `JSON.stringify()` and `JSON.parse()` are used. This is
  how message serialization was done before.
* `'advanced'`: The serialization API of the `v8` module is used. It is based on
  the HTML structured clone algorithm.
  and is able to serialize more built-in JavaScript object types, such as
  `BigInt`, `Map`, `Set` etc. as well as circular data structures.

Anna Henningsen [#30162](#30162).

CLI flags

The new `--trace-exit` CLI flag makes Node.js print a stack trace whenever the
Node.js environment is exited proactively (i.e. by invoking the `process.exit()`
function or pressing Ctrl+C).

legendecas [#30516](#30516).

___

The new `--trace-uncaught` CLI flag makes Node.js print a stack trace at the
time of throwing uncaught exceptions, rather than at the creation of the `Error`
object, if there is any.
This option is not enabled by default because it may affect garbage collection
behavior negatively.

Anna Henningsen [#30025](#30025).

___

The `--disallow-code-generation-from-strings` V8 CLI flag is now whitelisted in
the `NODE_OPTIONS` environment variable.

Shelley Vohr [#30094](#30094).

New crypto APIs

For DSA and ECDSA, a new signature encoding is now supported in addition to the
existing one (DER). The `verify` and `sign` methods accept a `dsaEncoding`
option, which can have one of two values:

* `'der'` (default): DER-encoded ASN.1 signature structure encoding `(r, s)`.
* `'ieee-p1363'`: Signature format `r || s` as proposed in IEEE-P1363.

Tobias Nießen [#29292](#29292).

___

A new method was added to `Hash`: `Hash.prototype.copy`. It makes it possible to
clone the internal state of a `Hash` object into a new `Hash` object, allowing
to compute the digest between updates.

Ben Noordhuis [#29910](#29910).

Dependency updates

libuv was updated to 1.34.0. This includes fixes to `uv_fs_copyfile()` and
`uv_interface_addresses()` and adds two new functions: `uv_sleep()` and
`uv_fs_mkstemp()`.

Colin Ihrig [#30783](#30783).

___

V8 was updated to 7.8.279.23. This includes performance improvements to object
destructuring, RegExp match failures and WebAssembly startup time.
The official release notes are available at https://v8.dev/blog/v8-release-78.

Michaël Zasso [#30109](#30109).

New EventEmitter APIs

The new `EventEmitter.on` static method allows to async iterate over events.

Matteo Collina [#27994](#27994).

___

It is now possible to monitor `'error'` events on an `EventEmitter` without
consuming the emitted error by installing a listener using the symbol
`EventEmitter.errorMonitor`.

Gerhard Stoebich [#30932](#30932).

___

Using `async` functions with event handlers is problematic, because it
can lead to an unhandled rejection in case of a thrown exception.

The experimental `captureRejections` option in the `EventEmitter` constructor or
the global setting change this behavior, installing a
`.then(undefined, handler)` handler on the `Promise`. This handler routes the
exception asynchronously to the `Symbol.for('nodejs.rejection')` method if there
is one, or to the `'error'` event handler if there is none.

Setting `EventEmitter.captureRejections = true` will change the default for all
new instances of `EventEmitter`.

This is an experimental feature.

Matteo Collina [#27867](#27867).

Performance Hooks are no longer experimental

The `perf_hooks` module is now considered a stable API.

legendecas [#31101](#31101).

Introduction of experimental WebAssembly System Interface (WASI) support

A new core module, `wasi`, is introduced to provide an implementation of the
[WebAssembly System Interface](https://wasi.dev/) specification.
WASI gives sandboxed WebAssembly applications access to the
underlying operating system via a collection of POSIX-like functions.

This is an experimental feature.

Colin Ihrig [#30258](#30258).

PR-URL: #31691
targos pushed a commit that referenced this pull request Feb 11, 2020
@MylesBorins @targos
2020-02-11, Version 12.16.0 'Erbium' (LTS)
1c11ea4 
Notable changes:

New assert APIs

The `assert` module now provides experimental `assert.match()` and
`assert.doesNotMatch()` methods. They will validate that the first argument is a
string and matches (or does not match) the provided regular expression

This is an experimental feature.

Ruben Bridgewater [#30929](#30929).

Advanced serialization for IPC

The `child_process` and `cluster` modules now support a `serialization` option
to change the serialization mechanism used for IPC. The option can have one of
two values:

* `'json'` (default): `JSON.stringify()` and `JSON.parse()` are used. This is
  how message serialization was done before.
* `'advanced'`: The serialization API of the `v8` module is used. It is based on
  the HTML structured clone algorithm.
  and is able to serialize more built-in JavaScript object types, such as
  `BigInt`, `Map`, `Set` etc. as well as circular data structures.

Anna Henningsen [#30162](#30162).

CLI flags

The new `--trace-exit` CLI flag makes Node.js print a stack trace whenever the
Node.js environment is exited proactively (i.e. by invoking the `process.exit()`
function or pressing Ctrl+C).

legendecas [#30516](#30516).

___

The new `--trace-uncaught` CLI flag makes Node.js print a stack trace at the
time of throwing uncaught exceptions, rather than at the creation of the `Error`
object, if there is any.
This option is not enabled by default because it may affect garbage collection
behavior negatively.

Anna Henningsen [#30025](#30025).

___

The `--disallow-code-generation-from-strings` V8 CLI flag is now whitelisted in
the `NODE_OPTIONS` environment variable.

Shelley Vohr [#30094](#30094).

New crypto APIs

For DSA and ECDSA, a new signature encoding is now supported in addition to the
existing one (DER). The `verify` and `sign` methods accept a `dsaEncoding`
option, which can have one of two values:

* `'der'` (default): DER-encoded ASN.1 signature structure encoding `(r, s)`.
* `'ieee-p1363'`: Signature format `r || s` as proposed in IEEE-P1363.

Tobias Nießen [#29292](#29292).

___

A new method was added to `Hash`: `Hash.prototype.copy`. It makes it possible to
clone the internal state of a `Hash` object into a new `Hash` object, allowing
to compute the digest between updates.

Ben Noordhuis [#29910](#29910).

Dependency updates

libuv was updated to 1.34.0. This includes fixes to `uv_fs_copyfile()` and
`uv_interface_addresses()` and adds two new functions: `uv_sleep()` and
`uv_fs_mkstemp()`.

Colin Ihrig [#30783](#30783).

___

V8 was updated to 7.8.279.23. This includes performance improvements to object
destructuring, RegExp match failures and WebAssembly startup time.
The official release notes are available at https://v8.dev/blog/v8-release-78.

Michaël Zasso [#30109](#30109).

New EventEmitter APIs

The new `EventEmitter.on` static method allows to async iterate over events.

Matteo Collina [#27994](#27994).

___

It is now possible to monitor `'error'` events on an `EventEmitter` without
consuming the emitted error by installing a listener using the symbol
`EventEmitter.errorMonitor`.

Gerhard Stoebich [#30932](#30932).

___

Using `async` functions with event handlers is problematic, because it
can lead to an unhandled rejection in case of a thrown exception.

The experimental `captureRejections` option in the `EventEmitter` constructor or
the global setting change this behavior, installing a
`.then(undefined, handler)` handler on the `Promise`. This handler routes the
exception asynchronously to the `Symbol.for('nodejs.rejection')` method if there
is one, or to the `'error'` event handler if there is none.

Setting `EventEmitter.captureRejections = true` will change the default for all
new instances of `EventEmitter`.

This is an experimental feature.

Matteo Collina [#27867](#27867).

Performance Hooks are no longer experimental

The `perf_hooks` module is now considered a stable API.

legendecas [#31101](#31101).

Introduction of experimental WebAssembly System Interface (WASI) support

A new core module, `wasi`, is introduced to provide an implementation of the
[WebAssembly System Interface](https://wasi.dev/) specification.
WASI gives sandboxed WebAssembly applications access to the
underlying operating system via a collection of POSIX-like functions.

This is an experimental feature.

Colin Ihrig [#30258](#30258).

PR-URL: #31691
codebytere added a commit to electron/electron that referenced this pull request Feb 21, 2020
@codebytere
fix: initialize diagnostics properly
1ef34a3 
nodejs/node#30025
codebytere added a commit to electron/electron that referenced this pull request Feb 21, 2020
@codebytere
fix: initialize diagnostics properly
b0ca0cf 
nodejs/node#30025
codebytere added a commit to electron/electron that referenced this pull request Feb 21, 2020
@codebytere
fix: initialize diagnostics properly
60e8810 
nodejs/node#30025
codebytere added a commit to electron/electron that referenced this pull request Feb 24, 2020
@codebytere
fix: initialize diagnostics properly
42be329 
nodejs/node#30025
codebytere added a commit to electron/electron that referenced this pull request Feb 24, 2020
@electron-bot @codebytere
chore: bump node to v12.16.1 (master) (#22168)
f965b13 
* chore: bump node in DEPS to v12.16.0

* Fixup asar support setup patch

nodejs/node#30862

* Fixup InternalCallbackScope patch

nodejs/node#30236

* Fixup GN buildfiles patch

nodejs/node#30755

* Fixup low-level hooks patch

nodejs/node#30466

* Fixup globals require patch

nodejs/node#31643

* Fixup process stream patch

nodejs/node#30862

* Fixup js2c modification patch

nodejs/node#30755

* Fixup internal fs override patch

nodejs/node#30610

* Fixup context-aware warn patch

nodejs/node#30336

* Fixup Node.js with ltcg config

nodejs/node#29388

* Fixup oaepLabel patch

nodejs/node#30917

* Remove redundant ESM test patch

nodejs/node#30997

* Remove redundant cli flag patch

nodejs/node#30466

* Update filenames.json

* Remove macro generation in GN build files

nodejs/node#30755

* Fix some compilation errors upstream

* Add uvwasi to deps

nodejs/node#30258

* Fix BoringSSL incompatibilities

* Fixup linked module patch

nodejs/node#30274

* Add missing sources to GN uv build

libuv/libuv#2347

* Patch some uvwasi incompatibilities

* chore: bump Node.js to v12.6.1

* Remove mark_arraybuffer_as_untransferable.patch

nodejs/node#30549

* Fix uvwasi build failure on win

* Fixup --perf-prof cli option error

* Fixup early cjs module loading

* fix: initialize diagnostics properly

nodejs/node#30025

* Disable new esm syntax specs

nodejs/node#30219

* Fixup v8 weakref hook spec

nodejs/node#29874

* Fix async context timer issue

* Disable monkey-patch-main spec

It relies on nodejs/node#29777, and we don't
override prepareStackTrace.

* Disable new tls specs

nodejs/node#23188

We don't support much of TLS owing to schisms between BoringSSL and
OpenSSL.

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>
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@BridgeAR BridgeAR BridgeAR approved these changes

@gireeshpunathil gireeshpunathil gireeshpunathil approved these changes

@richardlau richardlau richardlau approved these changes

@jasnell jasnell jasnell approved these changes

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7 participants
@addaleax @nodejs-github-bot @gireeshpunathil @danbev @jasnell @richardlau @BridgeAR