e36bf614c8
The one-pass transformation is structured as a search over the input machine for conditions that violate the one-pass requisites. At each iteration, we should fully explore all non-input paths that proceed from the current instruction; this is implemented via recursive check calls. But when we reach instructions that demand input (InstRune*), these should be put onto the search queue. Instead of searching this way, the routine previously (effectively) proceeded through the machine one instruction at a time until finding an Inst{Match,Fail,Rune*}, calling check on each instruction. This caused bug #11905, where the transformation stopped before rewriting all InstAlts as InstAltMatches. Further, the check function unnecessarily recurred on InstRune* instructions. (I believe this helps to mask the above bug.) This change also deletes some unused functions and duplicate test cases. Fixes #11905. Change-Id: I5b0b26efea3d3bd01c7479a518b5ed1b886701cd Reviewed-on: https://go-review.googlesource.com/17195 Reviewed-by: Russ Cox <rsc@golang.org> |
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