Created attachment 387148 [details]
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Created attachment 387154 [details]
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Comment on attachment 387154 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=387154&action=review

> Source/WebCore/Modules/indexeddb/shared/IDBCursorRecord.h:67
> +    encoder << !!value;

How did this ever work?
Why does it need changing?  It was an still is a std::unique_ptr.

Comment on attachment 387154 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=387154&action=review

>> Source/WebCore/Modules/indexeddb/shared/IDBCursorRecord.h:67
>> +    encoder << !!value;
> 
> How did this ever work?
> Why does it need changing?  It was an still is a std::unique_ptr.

If the pointer is not nullptr, we deref the pointer and encode IDBValue object. We encode !!value to indicate whether there is a subsequent encoded IDBValue.

(In reply to Sihui Liu from comment #4)
> Comment on attachment 387154 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=387154&action=review
> 
> >> Source/WebCore/Modules/indexeddb/shared/IDBCursorRecord.h:67
> >> +    encoder << !!value;
> > 
> > How did this ever work?
> > Why does it need changing?  It was an still is a std::unique_ptr.
> 
> If the pointer is not nullptr, we deref the pointer and encode IDBValue
> object. We encode !!value to indicate whether there is a subsequent encoded
> IDBValue.

It seems like we cannot encode a unique_ptr and pass that to another process.

Comment on attachment 387154 [details]
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View in context: https://bugs.webkit.org/attachment.cgi?id=387154&action=review

> Source/WebCore/Modules/indexeddb/IDBCursor.cpp:355
> +            m_prefetchedRecords.append(record);

Can we write it as the following:
if (auto prefetchedRecords = getResult.prefetchedRecords())
    m_prefetchedRecords = WTFMove(prefetchedRecords)

That would require IDBGetResult prefetchedRecords to return a Deque.

> Source/WebCore/Modules/indexeddb/IDBGetResult.h:80
> +    IDBGetResult(const IDBKeyData& keyData, const IDBKeyData& primaryKeyData, IDBValue&& value, const Optional<IDBKeyPath>& keyPath, const Optional<Vector<IDBCursorRecord>>& prefetechedRecords)

Can we change all/some of these to r-values, in particular prefetechedRecords?

> Source/WebCore/Modules/indexeddb/IDBGetResult.h:100
> +    const Optional<Vector<IDBCursorRecord>> prefetchedRecords() const { return m_prefetchedRecords; }

s/const Optional<Vector<IDBCursorRecord>>/const Optional<Vector<IDBCursorRecord>>&/

What is the difference between m_prefetchedRecords = {} and m_prefetchedRecords = Vector<IDBCursorRecord> { }?
Can we change it to a Deque<IDBCursorRecord>?

> Source/WebCore/Modules/indexeddb/shared/IDBCursorRecord.h:38
>      std::unique_ptr<IDBValue> value;

Why is it a unique_ptr in IDBCursorRecord but not in other places like IDBCursor?
Can we use an IDBValue or an Optional<IDBValue>?
That may allow removing these move/copy assignmenst/constructors.

This is part of https://bugs.webkit.org/show_bug.cgi?id=207602, which has been fixed.

*** This bug has been marked as a duplicate of bug 207602 ***