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LibJS: Fast non-local variable access :^)
This patch introduces the "environment coordinate" concept, which encodes the distance from a variable access to the binding it ends up resolving to. EnvironmentCoordinate has two fields: - hops: The number of hops up the lexical environment chain we have to make before getting to the resolved binding. - index: The index of the resolved binding within its declarative environment record. Whenever a variable lookup resolves somewhere inside a declarative environment, we now cache the coordinates and reuse them in subsequent lookups. This is achieved via a coordinate cache in JS::Identifier. Note that non-strict direct eval() breaks this optimization and so it will not be performed if the resolved environment has been permanently screwed by eval(). This makes variable access *significantly* faster. :^)
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@ -202,7 +202,7 @@ public:
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FlyString unwind_until_label() const { return m_unwind_until_label; }
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Reference resolve_binding(FlyString const&, Environment* = nullptr);
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Reference get_identifier_reference(Environment*, FlyString, bool strict);
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Reference get_identifier_reference(Environment*, FlyString, bool strict, size_t hops = 0);
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template<typename T, typename... Args>
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void throw_exception(GlobalObject& global_object, Args&&... args)
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