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authorcvs2svn <cvs2svn@FreeBSD.org>2000-06-18 10:00:08 +0000
committercvs2svn <cvs2svn@FreeBSD.org>2000-06-18 10:00:08 +0000
commite497906508084a5501f27a53a8ec0f23aa446e5b (patch)
tree152d32d807e92b14ac8ade604a4d650b637b1e93 /devel/bison1875/pkg-descr
parentce2feffa5c14f7f8552190efb9d77dcec41d3987 (diff)
This commit was manufactured by cvs2svn to create tag 'RELEASE_3_5_0'.release/3.5.0
Notes
Notes: svn path=/head/; revision=29673 svn path=/tags/RELEASE_3_5_0/; revision=29674; tag=release/3.5.0
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-Bison is a tool used to write parsers, such as the parser for GNU cc.
-It is similar to Yacc, which is included in the base FreeBSD system.
-
-The main difference between Bison and Yacc that I know of is that
-Bison supports the @N construction, which gives you access to
-the starting and ending line number and character number associated
-with any of the symbols in the current rule.
-
-Also, Bison supports the command `%expect N' which says not to mention
-the conflicts if there are N shift/reduce conflicts and no reduce/reduce
-conflicts.
-
-The differences in the algorithms stem mainly from the horrible
-kludges that Johnson had to perpetrate to make Yacc fit in a PDP-11.
-
-Also, Bison uses a faster but less space-efficient encoding for the
-parse tables (see Corbett's PhD thesis from Berkeley, "Static
-Semantics in Compiler Error Recovery", June 1985, Report No. UCB/CSD
-85/251), and more modern technique for generating the lookahead sets.
-(See "Efficient Construction of LALR(1) Lookahead Sets" by F. DeRemer
-and A. Pennello, in ACM TOPLS Vol 4 No 4, October 1982. Their
-technique is the standard one now.)