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Me too. I’m thinking there must be some library that knows how to marshal between object representations. Surely Graal doesn’t have universal objects that suit

• miguro 9y ago
  That's the thing - there is no marshaling. The objects are passed between the languages as pointers under-the-hood. There is a standard way of invoking methods/functions on those pointers, that works across all languages.
  • chrisseaton 9y ago
    To give you an idea of how deep this goes - you can pass a Ruby object to a C function and the C function can read and write it as if it was a pointer to a structure. http://chrisseaton.com/truffleruby/structs/ http://chrisseaton.com/truffleruby/structs/
• mike_hearn 9y ago
  It has a form of universal object used for scripting languages (but not more static languages like Java or C++). But using it is not required, it's just a convenience to make implementing languages easier. What it actually provides is a form of "universal abstract syntax tree". So if a C program wants to access a JavaScript object by writing "a->b = c" then the dereference is turned into a snippet of JavaScript code (in effect) and inlined right into the C function.