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LibJS: Bring function environment records closer to the spec

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This patch adds FunctionEnvironmentRecord as a subclass of the existing
DeclarativeEnvironmentRecord. Things that are specific to function
environment records move into there, simplifying the base.

Most of the abstract operations related to function environment records
are rewritten to match the spec exactly. I also had to implement
GetThisEnvironment() and GetSuperConstructor() to keep tests working
after the changes, so that's nice as well. :^)
This commit is contained in:
Andreas Kling 2021-06-22 13:30:48 +02:00
parent 6ed6434bab
commit aabd82d508
28 changed files with 228 additions and 159 deletions
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7
Userland/Libraries/LibJS/Runtime/Function.h
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@ -26,7 +26,7 @@ public:
virtual Value call() = 0;
virtual Value construct(Function& new_target) = 0;
virtual const FlyString& name() const = 0;
virtual DeclarativeEnvironmentRecord* create_environment_record() = 0;
virtual FunctionEnvironmentRecord* create_environment_record() = 0;
BoundFunction* bind(Value bound_this_value, Vector<Value> arguments);
@ -42,6 +42,11 @@ public:
virtual bool is_strict_mode() const { return false; }
// [[Environment]]
// The Environment Record that the function was closed over.
// Used as the outer environment when evaluating the code of the function.
virtual EnvironmentRecord* environment() { return nullptr; }
protected:
virtual void visit_edges(Visitor&) override;