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LibJS: Start implementing object shapes
This patch adds JS::Shape, which implements a transition tree for our Object class. Object property keys, prototypes and attributes are now stored in a Shape, and each Object has a Shape. When adding a property to an Object, we make a transition from the old Shape to a new Shape. If we've made the same exact transition in the past (with another Object), we reuse the same transition and both objects may now share a Shape. This will become the foundation of inline caching and other engine optimizations in the future. :^)
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10 changed files with 252 additions and 29 deletions
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@ -43,6 +43,7 @@ class Interpreter;
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class Object;
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class PrimitiveString;
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class ScopeNode;
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class Shape;
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class Statement;
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class Value;
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enum class DeclarationType;
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