cli: add --trace-uncaught flag #30025
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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.
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jasnell
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Oct 18, 2019
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@addaleax - can you please throw more light on what behavior change it causes to gc? |
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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. |
richardlau
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Oct 18, 2019
BridgeAR
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Oct 18, 2019
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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)? |
gireeshpunathil
approved these changes
Oct 19, 2019
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). |
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Landed in 31217a8. |
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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. PR-URL: #30025 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
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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. PR-URL: #30025 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
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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. PR-URL: #30025 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
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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
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Nov 5, 2019
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
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Jan 8, 2020
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 <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
targos
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Jan 8, 2020
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 <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
BethGriggs
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Feb 6, 2020
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 <[email protected]> Reviewed-By: Richard Lau <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Gireesh Punathil <[email protected]>
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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
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Feb 11, 2020
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
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* 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 <[email protected]>
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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
Errorobject, if there is any.This is disabled by default because it affects GC behavior.
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes