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svstuff / systemverilog

SystemVerilog stuff and stuff.
http://svstuff.github.io/systemverilog
MIT License
11 stars 4 forks source link

improve performance #4

Open svstuff opened 9 years ago

svstuff commented 9 years ago

It takes a bit too long to parse a large code base. Profiling has shown the bottleneck is in the generated parser code (as opposed to the preprocessor/scanner).

Need to do one of the following (in order of increasing effort):

The latter would be doable, but would require some thought on how to avoid compilation-order issues.

Another solution would be to accept a low-ish performance on the first parse but cache the results and subsequently only parse the files which have changed. This would still require a re-parse of files which tick-include the changed files however.

svstuff commented 9 years ago

Turns out the only thing that should be necessary is to fix the grammar. It has a lot of ambiguities and such. Once that is done I can also try a two-pass strategy as mentioned in the ANTLR book.