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Fixes map fields' behavior when used with arena. #459

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@xfxyjwf xfxyjwf commented Jun 3, 2015

  1. Implemented NewDeleteCapture to detect heap allocations.
  2. Made MapField allocate mutexs lazily so generated API will not cause any heap allocation when using arena.
  3. Added a type trait Arena::is_destructor_skippable to check whether an object's destructor can be skipped when used with arena. Removed some incorrectly marked DestructorSkippable_ typedef.

xfxyjwf added 2 commits Jun 3, 2015
Changed MapField to allocate mutex lazily and removed some incorrectly used DestructorSkippable_.
Currently the parsing code of lite messges will store unknown fields in a
string object that is not allocated in the arena. Before that bug is fixed,
heap check will fail for arena lite runtime tests.
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xfxyjwf commented Jun 3, 2015

Added a new commit to disable heap check for arena lite runtime tests. These tests will fail because of #445

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xfxyjwf commented Jun 6, 2015

@TeBoring to review

@@ -495,6 +495,20 @@ class LIBPROTOBUF_EXPORT Arena {
static const type value;

template<typename T>
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@TeBoring TeBoring Jul 9, 2015

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We already have this internally.

@TeBoring TeBoring added this to the 3.0.0-beta-1 milestone Jul 9, 2015
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TeBoring commented Jul 17, 2015

@xfxyjwf to reply new comments

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xfxyjwf commented Jul 17, 2015

As you have already made part of this change in our internal code base, I'll hold this PR until next down-integration when I'll merge and update the code.

@xfxyjwf xfxyjwf removed this from the 3.0.0-beta-1 milestone Aug 28, 2015
@xfxyjwf xfxyjwf closed this Jul 13, 2016
@xfxyjwf xfxyjwf deleted the skippable branch Jul 13, 2016
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3 participants