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ic refactoring (#17778)

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* minor IC documentation update

* IC: refactoring: removed the 'shared' type and fields, these were a leftover from an earlier design
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Andreas Rumpf 2021-04-19 11:48:06 +02:00 • committed by GitHub
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8
compiler/ic/design.rst
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@ -7,12 +7,8 @@ The frontend produces a set of `.rod` files. Every `.nim` module
produces its own `.rod` file.
- The IR must be a faithful representation of the AST in memory.
- The backend can do its own caching but doesn't have to.
- We know by comparing 'nim check compiler/nim' against 'nim c compiler/nim'
that 2/3 of the compiler's runtime is spent in the frontend. Hence we
implement IC for the frontend first and only later for the backend. The
backend will recompile everything until we implement its own caching
mechanisms.
- The backend can do its own caching but doesn't have to. In the
current implementation the backend also caches its results.
Advantage of the "set of files" vs the previous global database:
- By construction, we either read from the `.rod` file or from the