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Refctor node kind names by concatenating category and instance, to
allow better sorting. Comments are now parsed and skipped during
generation of AST.
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So multiple successive incremental Evals function correctly.
Also improve the following:
- Apply the same Eval API to vm0 and vm1
- parser: dot diagram display is now synchronous
- codegen: outsource complex code generation for readability
- vm1: Pop take the number of values to pop as operand
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This makes the code easier to use.
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The "Enter" instruction has been removed and the frame pointer is
now saved by the "Call" instruction.
The "Return" instruction now takes the number of function input
parameters as the second operand. It's used to return the output
values at the correct place in the caller frame, no matter the
number of input parameters.
The tests and the code generator have been updated accordingly.
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* codegen: add a bytecode generator
* cleaning scanner, parser and vm1.
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