src: separate trace_event_common from trace_event #10628

targos · 2017-01-05T08:49:32Z

Currently, trace_event.h contains a full copy of the header present in
deps/v8/base/trace_event/common/trace_event_common.h mixed with
implementation-specific macros.
This patch moves the V8 code to its own file and includes it from
trace_event.h.

make -j4 test (UNIX), or vcbuild test (Windows) passes
commit message follows commit guidelines

src

targos · 2017-01-05T08:52:49Z

/cc @jasongin @nodejs/diagnostics @nodejs/v8

I'm happy to remove the copy and directly include it from deps if you want.

jasongin · 2017-01-05T17:28:36Z

LGTM, certainly an improvement, though I don't know if it's the best approach.

@ofrobots do you know why trace_event_common.h was originally added at deps\v8\trace_event\common rather than deps\v8\include? If it was in the latter location then it would be easier to just #include in trace_event.h here.

Ideally @matthewloring should also comment on this, but I don't know when he is going to be back at work.

ofrobots · 2017-01-05T18:16:42Z

IIRC it was quite intentional that @matthewloring did not directly include trace_event_common.h – but the details escape me. Perhaps @fmeawad knows too. Matt should be back mid next week, he has the full context here.

Perhaps we can go with #10623 as the workaround for now and figure out a longer-term solution (this PR or otherwise) once @matthewloring is back.

jasongin · 2017-01-05T18:21:01Z

#10623 is not a workaround for this issue, it is just a fix for a separate tracing-related bug.

ofrobots · 2017-01-05T19:06:19Z

Ah sorry, I misunderstood. In that case the work-around might be to copy over the necessary changes from trace_event_common.h in order to unblock #9618? @targos, I can put that together if you want, but it might be simpler for you to add the changes in #9618.

matthewloring · 2017-01-06T05:40:32Z

This change is definitely a step in the right direction. The reason I did not depend on the file directly was to avoid a dependency on a directory outside of deps/v8/include. IIRC the file was put outside of deps/v8/include because it was originally copied from Chromium but @fmeawad would have more context.

joshgav · 2017-02-06T17:41:11Z

V8 includes trace_event_common.h here with #include "base/trace_event/common/trace_event_common.h", which relies on the upstream src/base/trace_event/common repo in Chromium here.

@ofrobots @fmeawad would it be a good idea for Node to include the "trace_event_common" repo from Chromium directly under deps here in Node, rather than copy the file to deps/v8 as currently? And long term should we rely on one of these upstreams or our own fork as in #9304 and here?

joshgav · 2017-02-23T22:21:29Z

Conclusion in discussion in Diag WG meeting today is that Node should manage its copy of the trace_event headers however we see fit and not worry about upstream Chromium. V8/Google plan to provide a proper tracing library eventually and when that's ready we can sync with it upstream.

targos · 2017-02-28T13:14:11Z

@joshgav thanks. Does it mean that we should go on with this PR?

Currently, trace_event.h contains a full copy of the header present in deps/v8/base/trace_event/common/trace_event_common.h mixed with implementation-specific macros. This patch moves the V8 code to its own file and includes it from trace_event.h. The header is also updated to the latest version from V8 5.6.

targos · 2017-03-01T21:32:09Z

Rebased and updated to the latest version from V8 5.6. src/tracing/trace_event_common.h is now a copy of deps/v8/base/trace_event/common/trace_event_common.h.

jasnell · 2017-03-24T23:16:06Z

Any updates on this one?

targos · 2017-03-25T06:45:11Z

I'm just waiting for some reviews

bnoordhuis · 2017-03-26T10:18:23Z

src/tracing/trace_event_common.h

@@ -0,0 +1,1073 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.


This file doesn't need include guards?

targos · 2017-03-26T10:32:17Z

src/tracing/trace_event_common.h

+
+#if defined(TRACE_EVENT0)
+#error "Another copy of this file has already been included."
+#endif


@bnoordhuis It has this ^

Right, but the file you moved that from has traditional include guards. I wondered (and wonder) if there is a reason not to add them here.

I didn't think about that. This is just a copy of the file from V8. Would you like me to add include guards?

joshgav · 2017-03-28T16:31:47Z

LGTM.

But it doesn't seem to fix the break noted here (comment), per my testing with this follow-on commit.

cc @matthewloring

matthewloring · 2017-03-29T18:47:19Z

There are likely more changes required to account for updates to the macros in V8 5.7 which just landed on master. I'm currently working to put together a set of steps for updating these macros when V8 is updated. I also have a patch that will fix these files for 5.7. I can post the steps I've been using here or open the patch separately. @targos What would you prefer?

targos · 2017-03-29T19:25:01Z

@matthewloring go ahead and open a PR

matthewloring · 2017-03-29T20:54:50Z

Opened here: #12127

targos · 2017-03-30T06:07:04Z

Thanks. I'll close this one then.

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joshgav mentioned this pull request Feb 6, 2017

[trace_event] tracking issue nodejs/diagnostics#84

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Diag WG Meeting - 2017-02 nodejs/diagnostics#85

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targos force-pushed the trace-event-common branch from fde6e01 to f09c2bc Compare March 1, 2017 21:29

bnoordhuis reviewed Mar 26, 2017

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joshgav approved these changes Mar 28, 2017

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targos deleted the trace-event-common branch June 1, 2017 08:02

		@@ -0,0 +1,1073 @@
		// Copyright 2015 The Chromium Authors. All rights reserved.

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src: separate trace_event_common from trace_event #10628

src: separate trace_event_common from trace_event #10628

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