Guido van Rossum 8f18ac04d3 GH-98831: Add macro and op and their implementation to DSL (#99495) ...

Newly supported interpreter definition syntax:
- `op(NAME, (input_stack_effects -- output_stack_effects)) { ... }`
- `macro(NAME) = OP1 + OP2;`

Also some other random improvements:
- Convert `WITH_EXCEPT_START` to use stack effects
- Fix lexer to balk at unrecognized characters, e.g. `@`
- Fix moved output names; support object pointers in cache
- Introduce `error()` method to print errors
- Introduce read_uint16(p) as equivalent to `*p`

Co-authored-by: Brandt Bucher <brandtbucher@gmail.com>

2022-11-22 16:04:57 -08:00

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