src: fix linking when built as shared library #3098

zcbenz · 2015-09-28T03:35:50Z

This is another solution to fix the problem in #3046 as suggested by @bnoordhuis.

Currently linking Node as shared library in third party embedders will result in undefined symbols problem because the constructor of Environment is inlined and is calling constructor of debugger::Agent, which is not exported. This fix moves the constructor and destructor of Environment to src/env.cc to avoid leaking implementation details to solve this problem.

Following changes are also made for the fix:

The types of Environment's properties are changed from v8::Persistent to v8::Global, so we don't have to manually reset all of them, this is because the ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES macro is removed in env-inl.h and calling Reset() in env.cc would be very hard.
A new IsolateData::Scope class is introduced to manage IsolateData automatically instead of manually calling Put(), so we can rely the destructor to do clean up job.
The *_buffer_ members are managed by std::vector so we don't have to manually delete them in destructor.
PersistentToLocal are extended to handle v8::Global.
The Environment::New and Environment::Dispose are now exported functions so embedders can still use them as APIs without knowing the definition of Environment's constructor.

bnoordhuis · 2015-09-28T08:55:01Z

src/env-inl.h

@@ -25,7 +34,6 @@ inline Environment::IsolateData* Environment::IsolateData::GetOrCreate(
    isolate_data = new IsolateData(isolate, loop);
    isolate->SetData(kIsolateSlot, isolate_data);
  }
-  isolate_data->ref_count_ += 1;


This makes GetOrCreate() rather dangerous to use. Can I suggest that you remove Get(), GetOrCreate() and Put() and do all management inside the Scope constructor and destructor, with a method or dereference operator to get the raw IsolateData*?

bnoordhuis · 2015-09-28T09:03:12Z

The types of Environment's properties are changed from v8::Persistent to v8::Global, so we don't have to manually reset all of them

I don't really like how that makes the handles movable when they're noncopyable now. I'd be okay with not undef'ing ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES in env.h.

The Environment::New and Environment::Dispose are now exported functions so embedders can still use them as APIs without knowing the definition of Environment's constructor.

I'm not really a fan of exposing what are essentially implementation details. Can other collaborators chime in?

zcbenz · 2015-09-28T09:17:52Z

I don't really like how that makes the handles movable when they're noncopyable now. I'd be okay with not undef'ing ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES in env.h.

If we are reserving the ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES in env.h, should I revert the other changes like the IsolateData::Scope and std::vector ones? Since the purpose of them are to make sure the sequence of destruction is not changed.

I'm not really a fan of exposing what are essentially implementation details

I'm not sure if Environment::New belongs to implementation details, in Electron we used it to create an empty Environment under some conditions.

bnoordhuis · 2015-09-28T09:45:01Z

If we are reserving the ENVIRONMENT_STRONG_PERSISTENT_PROPERTIES in env.h, should I revert the other changes like the IsolateData::Scope and std::vector ones?

I'll leave that up to you. I think the std::vector change is an improvement and IsolateData::Sope will be as well with the suggested changes. Maybe break it in two commits, one removing the #undef, the other with code improvements.

I'm not sure if Environment::New belongs to implementation details, in Electron we used it to create an empty Environment under some conditions.

I don't consider it part of the public API, that's what CreateEnvironment() is for.

zcbenz · 2015-09-28T10:25:26Z

I'll leave that up to you. I think the std::vector change is an improvement and IsolateData::Sope will be as well with the suggested changes. Maybe break it in two commits, one removing the #undef, the other with code improvements.

Cool, I'll split it into two commits.

I don't consider it part of the public API, that's what CreateEnvironment() is for.

So should we only expose the Environment::Dispose? That seems to be only API to destroy an Environment.

bnoordhuis · 2015-09-28T10:48:17Z

So should we only expose the Environment::Dispose? That seems to be only API to destroy an Environment.

I guess for consistency it's better to add a FreeEnvironment() to src/node.h.

zcbenz · 2015-09-28T11:24:07Z

I have updated the commit to simply hide Environment's constructor and destruct, and add a node:: FreeEnvironment API.

bnoordhuis · 2015-09-28T12:44:03Z

Circling back to the original link error message you reported in #3046, now that there is a way to create and dispose Environments through opaque pointers, do the constructor and destructor still need to be moved around?

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly.

zcbenz · 2015-09-28T13:46:02Z

You are right, having an node::FreeEnvironment API should be enough, I have updated the commit.

bnoordhuis · 2015-09-28T13:50:08Z

LGTM, thanks. CI: https://ci.nodejs.org/job/node-test-pull-request/393/

bnoordhuis · 2015-11-10T23:03:19Z

Forgot about this, sorry about that. Another CI run: https://ci.nodejs.org/job/node-test-pull-request/695/

eljefedelrodeodeljefe · 2016-05-19T10:52:09Z

@bnoordhuis is there anything against merging this?

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly. PR-URL: #3098 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

bnoordhuis · 2016-05-19T11:01:44Z

Nothing, I merely forgot about it again. Landed in 2ab75b7 and I'll update the tags; it can land in a semver-minor release if desired.

eljefedelrodeodeljefe · 2016-05-19T12:05:00Z

Awesome thanks. Making a reference to nodejs/build#359... there are several guys having done work on this in forks and external repos. I'll collect some info and hope to drive android support forward,

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly. PR-URL: #3098 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

MylesBorins · 2016-06-29T16:25:07Z

@nodejs/lts would we like to include this in v4.5.0?

Fishrock123 · 2016-06-30T12:31:34Z

@thealphanerd might not be a bad idea, +0.5

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly. PR-URL: #3098 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Notable changes: * buffer: Added `buffer.swap64()` to compliment `swap16()` & `swap32()`. (Zach Bjornson) #7157 * build: New `configure` options have been added for building Node.js as a shared library. (Stefan Budeanu) #6994 - The options are: `--shared`, `--without-v8-platform` & `--without-bundled-v8`. * crypto: Root certificates have been updated. (Ben Noordhuis) #7363 * debugger: The server address is now configurable via `--debug=<address>:<port>`. (Ben Noordhuis) #3316 * npm: Upgraded npm to v3.10.3 (Kat Marchán) #7515 & (Rebecca Turner) #7410 * readline: Added the `prompt` option to the readline constructor. (Evan Lucas) #7125 * repl / vm: `sigint`/`ctrl+c` will now break out of infinite loops without stopping the Node.js instance. (Anna Henningsen) #6635 * src: - Added a `node::FreeEnvironment` public C++ API. (Cheng Zhao) #3098 - Refactored `require('constants')`, constants are now available directly from their respective modules. (James M Snell) #6534 * stream: Improved `readable.read()` performance by up to 70%. (Brian White) #7077 * timers: `setImmediate()` is now up to 150% faster in some situations. (Andras) #6436 * util: Added a `breakLength` option to `util.inspect()` to control how objects are formatted across lines. (cjihrig) #7499 * v8-inspector: Experimental support has been added for debugging Node.js over the inspector protocol. (Ali Ijaz Sheikh) #6792 - *Note: This feature is experimental, and it could be altered or removed.* - You can try this feature by running Node.js with the `--inspect` flag. Refs: #7441 PR-URL: #7550

### Notable changes * **buffer**: Added `buffer.swap64()` to compliment `swap16()` & `swap32()`. (Zach Bjornson) [#7157](nodejs/node#7157) * **build**: New `configure` options have been added for building Node.js as a shared library. (Stefan Budeanu) [#6994](nodejs/node#6994) - The options are: `--shared`, `--without-v8-platform` & `--without-bundled-v8`. * **crypto**: Root certificates have been updated. (Ben Noordhuis) [#7363](nodejs/node#7363) * **debugger**: The server address is now configurable via `--debug=<address>:<port>`. (Ben Noordhuis) [#3316](nodejs/node#3316) * **npm**: Upgraded npm to v3.10.3 (Kat Marchán) [#7515](nodejs/node#7515) & (Rebecca Turner) [#7410](nodejs/node#7410) * **readline**: Added the `prompt` option to the readline constructor. (Evan Lucas) [#7125](nodejs/node#7125) * **repl / vm**: `sigint`/`ctrl+c` will now break out of infinite loops without stopping the Node.js instance. (Anna Henningsen) [#6635](nodejs/node#6635) * **src**: - Added a `node::FreeEnvironment` public C++ API. (Cheng Zhao) [#3098](nodejs/node#3098) - Refactored `require('constants')`, constants are now available directly from their respective modules. (James M Snell) [#6534](nodejs/node#6534) * **stream**: Improved `readable.read()` performance by up to 70%. (Brian White) [#7077](nodejs/node#7077) * **timers**: `setImmediate()` is now up to 150% faster in some situations. (Andras) [#6436](nodejs/node#6436) * **util**: Added a `breakLength` option to `util.inspect()` to control how objects are formatted across lines. (cjihrig) [#7499](nodejs/node#7499) * **v8-inspector**: Experimental support has been added for debugging Node.js over the inspector protocol. (Ali Ijaz Sheikh) [#6792](nodejs/node#6792) - **Note: This feature is _experimental_, and it could be altered or removed.** - You can try this feature by running Node.js with the `--inspect` flag.

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly. PR-URL: #3098 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Notable Changes: This list is not yet complete. Please comment in the thread with commits you think should be included. Descriptions will also be updated in a later release candidate. Semver Minor: * buffer: * backport new buffer constructor APIs to v4.x (Сковорода Никита Андреевич) #7562 * ignore negative allocation lengths (Anna Henningsen) #7562 * backport --zero-fill-buffers cli option (James M Snell) #5745 * build: * add Intel Vtune profiling support (Chunyang Dai) #5527 * repl: * copying tabs shouldn't trigger completion (Eugene Obrezkov) #5958 * src: * add node::FreeEnvironment public API (Cheng Zhao) #3098 * test: * run v8 tests from node tree (Bryon Leung) #4704 * V8: * backport 9c927d0f01 from V8 upstream (Myles Borins) #7451 * cherry-pick 68e89fb from v8's upstream (Fedor Indutny) #3779 Semver Patch: * **libuv**: * upgrade libuv to 1.9.1 (Saúl Ibarra Corretgé) #6796 * upgrade libuv to 1.9.0 (Saúl Ibarra Corretgé) #5994

Notable Changes: This list is not yet complete. Please comment in the thread with commits you think should be included. Descriptions will also be updated in a later release candidate. Semver Minor: * buffer: * backport new buffer constructor APIs to v4.x (Сковорода Никита Андреевич) #7562 * ignore negative allocation lengths (Anna Henningsen) #7562 * backport --zero-fill-buffers cli option (James M Snell) #5745 * build: * add Intel Vtune profiling support (Chunyang Dai) #5527 * repl: * copying tabs shouldn't trigger completion (Eugene Obrezkov) #5958 * src: * add node::FreeEnvironment public API (Cheng Zhao) #3098 * test: * run v8 tests from node tree (Bryon Leung) #4704 * V8: * Add post portem data to imrpove object inspection and function's context variables inspection (Fedor Indutny) #3779 Semver Patch: * **libuv**: * upgrade libuv to 1.9.1 (Saúl Ibarra Corretgé) #6796 * upgrade libuv to 1.9.0 (Saúl Ibarra Corretgé) #5994

Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly. PR-URL: #3098 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Notable Changes: This list is not yet complete. Please comment in the thread with commits you think should be included. Descriptions will also be updated in a later release candidate. Semver Minor: * buffer: * backport new buffer constructor APIs to v4.x (Сковорода Никита Андреевич) #7562 * backport --zero-fill-buffers cli option (James M Snell) #5745 * build: * add Intel Vtune profiling support (Chunyang Dai) #5527 * repl: * copying tabs shouldn't trigger completion (Eugene Obrezkov) #5958 * src: * add node::FreeEnvironment public API (Cheng Zhao) #3098 * test: * run v8 tests from node tree (Bryon Leung) #4704 * V8: * Add post portem data to imrpove object inspection and function's context variables inspection (Fedor Indutny) #3779 Semver Patch: * **buffer**: * ignore negative allocation lengths (Anna Henningsen) #7562 * **libuv**: * upgrade libuv to 1.9.1 (Saúl Ibarra Corretgé) #6796 * upgrade libuv to 1.9.0 (Saúl Ibarra Corretgé) #5994 * **npm**: * upgrade to 2.15.9 (Kat Marchán) #7692

Notable Changes: Semver Minor: * buffer: * backport new buffer constructor APIs to v4.x (Сковорода Никита Андреевич) #7562 * backport --zero-fill-buffers cli option (James M Snell) #5745 * build: * add Intel Vtune profiling support (Chunyang Dai) #5527 * repl: * copying tabs shouldn't trigger completion (Eugene Obrezkov) #5958 * src: * add node::FreeEnvironment public API (Cheng Zhao) #3098 * test: * run v8 tests from node tree (Bryon Leung) #4704 * V8: * Add post mortem data to improve object inspection and function's context variables inspection (Fedor Indutny) #3779 Semver Patch: * **buffer**: * ignore negative allocation lengths (Anna Henningsen) #7562 * **crypto**: * update root certificates (Ben Noordhuis) #7363 * **libuv**: * upgrade libuv to 1.9.1 (Saúl Ibarra Corretgé) #6796 * upgrade libuv to 1.9.0 (Saúl Ibarra Corretgé) #5994 * **npm**: * upgrade to 2.15.9 (Kat Marchán) #7692

brendanashworth added the c++ Issues and PRs that require attention from people who are familiar with C++. label Sep 28, 2015

ChALkeR added the build Issues and PRs related to build files or the CI. label Sep 28, 2015

bnoordhuis reviewed Sep 28, 2015
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src: add node::FreeEnvironment public API

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Since debugger::Agent's interface is not exported, third party embedders will have linking errors if they call Environment's destructor directly.

rvagg mentioned this pull request Sep 29, 2015

src: export Agent's constructor and destructor #3046

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Trott force-pushed the master branch from 1e896a6 to 082cc8d Compare December 27, 2015 02:00

jasnell added the stalled Issues and PRs that are stalled. label Mar 22, 2016

estliberitas force-pushed the master branch 2 times, most recently from 7da4fd4 to c7066fb Compare April 26, 2016 05:22

bnoordhuis closed this May 19, 2016

bnoordhuis added semver-minor PRs that contain new features and should be released in the next minor version. lts-watch-v4.x and removed stalled Issues and PRs that are stalled. labels May 19, 2016

eljefedelrodeodeljefe mentioned this pull request May 19, 2016

Support for Android nodejs/build#359

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Fishrock123 mentioned this pull request Jun 27, 2016

Propose v6.3.0 #7441

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Fishrock123 mentioned this pull request Jul 5, 2016

Propose v6.3.0 (v2) #7550

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cjean-fr mentioned this pull request Jul 7, 2016

Update nodejs to 6.3.0 ScoopInstaller/Scoop#948

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MylesBorins added land-on-v4.x and removed lts-watch-v4.x labels Jul 11, 2016

MylesBorins mentioned this pull request Jul 12, 2016

Semver-Minor commits in v4.x-staging nodejs/Release#120

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v4.5.0 proposal #7688

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ronag mentioned this pull request Dec 22, 2019

stream: destroy(err) predictability #31060

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src: fix linking when built as shared library #3098

src: fix linking when built as shared library #3098

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src: fix linking when built as shared library #3098

src: fix linking when built as shared library #3098

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