• svenpanne@chromium.org's avatar
    Handle CALLBACKS correctly in IsProperty functions. · 18ba2216
    svenpanne@chromium.org authored
    With transitions in AccessorPairs, it is not enough to look at the PropertyType
    alone to decide whether we look at a property or not: For objects with
    JavaScript accessors, we have to look into the AccessorPair itself and see if
    one of its 2 parts is actually a JavaScript accessor. Therefore, a predicate
    with a PropertyType argument alone doesn't make sense anymore, we might need the
    associated value, too.
    
    Things are complicated by the fact that the holder in a LookupResult can be
    NULL, so we must be careful to retrieve its value only when it is really
    needed. To achieve the needed call-by-name semantics, a new Entry is introduced,
    which is basically a closure over a DescriptorArray and an index into this array
    (C++0x to the rescue!). GCC is clever enough to inline this class, so we pay no
    runtime penalty for this abstraction.
    
    It's all a bit ugly, but this is caused by the current structure of Descriptor,
    DescriptorArray and LookupResult: Things would be much easier if DescriptorArray
    were, well, an array of Descriptors, and LookupResult were a 'Maybe Descriptor'
    (in Haskell-terms).
    
    Review URL: https://chromiumcodereview.appspot.com/9466047
    
    git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10847 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
    18ba2216
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