New backend (elpi 2.0) #269
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gares
changed the title
This was referenced Nov 15, 2024
Scope term add impl constructor
…uted_functional_preds to checked_compilation_unit
[functionality] add functionality field to program
[determinacy] refactor determinacy checker (working with unique type …
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The new backend reorganizes compilation passes so to allocate integers for global constants late, at unit linking time, and avoid relocations (of previously allocated constants). This speeds up compilation substantially. Also the index is built incrementally as units are linked in, reducing startup time (the optimize step is now almost a no-op). A new type checker runs on all units as they are compiled, before spilling that can now use the types computed by the checker (although the current code is still as brittle as before w.r.t. polarity). Types are checked as well. The AST contains locations, and the type checker reports errors with precision. Quotations are expanded early and must produce a new ScopedTerm data type that is still based on names, but with scopes, so that names of different languages don't conflict. Macros are expanded early and are now hygienic (some renaming may be needed and may show up in type errors later on). The HTML printer and elpi-checker.elpi are gone, as well as the API to quote elpi's syntax. An experimental determinacy checker is also part of the backend (off for now).