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(parent: a382997) | patch
Fix infinite-loop risk in fixempties() stage of regex compilation.
authorTom Lane <tgl@sss.pgh.pa.us>
Thu, 7 Mar 2013 16:51:18 +0000 (11:51 -0500)
committerTom Lane <tgl@sss.pgh.pa.us>
Thu, 7 Mar 2013 16:51:18 +0000 (11:51 -0500)
commit1dd92380b00781b8318d6d3fb2817468e43fe3a5
tree31eef2e4ca0c43ef2647ea70dfe52a296a74bcf9tree | snapshot
parenta382997ee07a8550f4ea23b5a542b046268a273ccommit | diff
Fix infinite-loop risk in fixempties() stage of regex compilation.

The previous coding of this function could get into situations where it
would never terminate, because successive passes would re-add EMPTY arcs
that had been removed by the previous pass.  Rewrite the function
completely using a new algorithm that is guaranteed to terminate, and
also seems to be usually faster than the old one.  Per Tcl bugs 3604074
and 3606683.

Tom Lane and Don Porter
src/backend/regex/regc_nfa.c diff | blob | history
src/backend/regex/regcomp.c diff | blob | history
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