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Define a pair of lookup methods for this and generate code that uses
them. Write back after calling a non-const method.
Task-number: QTBUG-127174
Change-Id: I6de22e76b63390fd7159d9c14ea2c908d961ec97
Reviewed-by: Olivier De Cannière <olivier.decanniere@qt.io>
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With SetLookup there is always the possibility of causing a reset by
passing undefined. That's why we need to wrap the argument into QVariant
most of the time. SetValueLookup didn't take this into account, which
resulted in invalid code.
The test also reveals that a number of cases were generating different
errors depending on whether the code was run in interpreted or compiled
mode. Align those.
Pick-to: 6.8
Task-number: QTBUG-127174
Change-Id: I88f45977dcd0eeba8aaf580663d4b85b8bb26f72
Reviewed-by: Olivier De Cannière <olivier.decanniere@qt.io>
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
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qmlcachegen will never generate code that calls these with mismatched
types. Checking the type at run time is wasteful. With QML_USING, you
can make qmlcachegen generate code with types we cannot recognize as
compatible. However, those need to be layout-compatible so that they
can be reinterpret_cast'ed into each other. If they aren't that's a user
error in C++. We can crash on such a thing.
However, in StoreNameSloppy and in the variant lookup cases, we do need
to convert types. Since the QML_USING type conversions are unknown to
the QML engine, we have to provide a fallback via QMetaType::convert()
here. So, despite the layout compatibility requirement, the QML_USING
types also need to register metatype converters before any QML code
accesses them.
As a result QML_USING has quite a few complicated requirements now and
is _really_ dangerous.
Pick-to: 6.8
Task-number: QTBUG-127174
Change-Id: I1b8e1595e3088415ce711e910586a5dd456cb2c5
Reviewed-by: Olivier De Cannière <olivier.decanniere@qt.io>
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