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LibJS: Start implementing object shapes

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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. :^)
This commit is contained in:
Andreas Kling 2020-04-02 19:32:21 +02:00
parent 3906d2b46a
commit 5e6e1fd482
10 changed files with 252 additions and 29 deletions
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Libraries/LibJS/Makefile
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@ -27,6 +27,7 @@ OBJS = \
Runtime/ObjectPrototype.o \
Runtime/PrimitiveString.o \
Runtime/ScriptFunction.o \
Runtime/Shape.o \
Runtime/StringObject.o \
Runtime/StringPrototype.o \
Runtime/Value.o \