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LibJS: Support array holes, encoded as empty JS::Value
This patch adds a new kind of JS::Value, the empty value. It's what you get when you do JSValue() (or most commonly, {} in C++.) An empty Value signifies the absence of a value, and should never be visible to JavaScript itself. As of right now, it's used for array holes and as a return value when an exception has been thrown and we just want to unwind. This patch is a bit of a mess as I had to fix a whole bunch of code that was relying on JSValue() being undefined, etc.
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9 changed files with 102 additions and 35 deletions
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@ -119,6 +119,8 @@ static void print_object(const JS::Object& object, HashTable<JS::Object*>& seen_
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fputs("{ ", stdout);
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for (size_t i = 0; i < object.elements().size(); ++i) {
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if (object.elements()[i].is_empty())
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continue;
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printf("\"\033[33;1m%zu\033[0m\": ", i);
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print_value(object.elements()[i], seen_objects);
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if (i != object.elements().size() - 1)
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