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LibJS: Add the CreateMappedArgumentsObject abstract operation

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This patch adds a new ArgumentsObject class to represent what the spec
calls "Arguments Exotic Objects"

These are constructed by the new CreateMappedArgumentsObject when the
`arguments` identifier is resolved in a callee context.

The implementation is incomplete and doesn't yet support mapping of
the parameter variables to the indexed properties of `arguments`.
This commit is contained in:
Andreas Kling 2021-06-28 13:26:01 +02:00
parent a55cf08ef9
commit 2d4eb40f59
8 changed files with 95 additions and 10 deletions
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Userland/Libraries/LibJS/Runtime/Object.h
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@ -108,6 +108,7 @@ public:
virtual bool is_global_object() const { return false; }
virtual bool is_proxy_object() const { return false; }
virtual bool is_native_function() const { return false; }
virtual bool is_ordinary_function_object() const { return false; }
// B.3.7 The [[IsHTMLDDA]] Internal Slot, https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
virtual bool is_htmldda() const { return false; }