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[OpenMP] Require trivially copyable type for mapping

Authored by Hahnfeld on Dec 6 2019, 10:45 AM.



A trivially copyable type provides a trivial copy constructor and a trivial
copy assignment operator. This is enough for the runtime to memcpy the data
to the device. Additionally there must be no virtual functions or virtual
base classes and the destructor is guaranteed to be trivial, ie performs
no action.
The runtime does not require trivial default constructors because on alloc
the memory is undefined. Thus, weaken the warning to be only issued if the
mapped type is not trivially copyable.

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Hahnfeld created this revision.Dec 6 2019, 10:45 AM
Herald added a project: Restricted Project. · View Herald TranscriptDec 6 2019, 10:45 AM
ABataev added inline comments.Dec 6 2019, 10:53 AM

Need to add a check for defaulted destructor here, isTriviallyCopyableType does not include this check.

Hahnfeld marked 2 inline comments as done.Dec 6 2019, 12:01 PM
Hahnfeld added inline comments.

As I said in the summary, this is a prerequisite for being trivially copyable and as such checked by CXXRecordDecl::isTriviallyCopyable() (line if (!hasTrivialDestructor()) return false;).

This revision is now accepted and ready to land.Dec 6 2019, 12:08 PM
This revision was automatically updated to reflect the committed changes.
Hahnfeld marked an inline comment as done.