Bindings, Platforms, and Innovation
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Posted by Werner Schuster on Oct 17, 2007 03:00 PM
The first of two recent articles about Rubinius is by Giles Bowkett, who tries to get started with Rubinius compiler development. The Rubinius compiler works by traversing Ruby Abstract Syntax Tree (AST), a tree representation of the Ruby source, using ParseTree s-expressions. This means it is an array using symbols to describe the data. An addition, for instance, would look like this:[:call, [:lit, 1], :+, [:array, [:lit, 1]]]
[:lit, 42]
:alias node:def process_alias(node)
cur = node.shift
nw = node.shift
# ...
end
alias call is parsed into [:alias, :old_name, :new_name], which the compiler handles as such:def process_alias(x)
cur = x.shift
nw = x.shift
add "push :#{cur}"
add "push :#{nw}"
add "push self"
add "send alias_method 2"
end
curr) and the new name (in nw), and creates the bytecode instructions (as strings) necessary to implement the functionality, which are then turned into the binary bytecodes executed by the Rubinius interpreter.link.
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