GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
Unix |
Unix v6 |
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yacc(1) |
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yacc yet another compiler-compiler [ ] [ grammar ]
converts a context-free grammar into a set of tables for a
simple automaton which executes an LR(1) parsing algorithm.
The grammar may be ambiguous; specified precedence rules are
used to break ambiguities. The output is which must be
compiled by the C compiler and loaded with any other
routines required (perhaps a lexical analyzer) and the Yacc
library: cc y.tab.c other.o ly If the flag is given, the
file is prepared, which contains a description of the
parsing tables and a report on conflicts generated by
ambiguities in the grammar. The flag calls an optimizer for
the tables; the optimized tables, with parser included,
appear on file The flag causes Yacc to accept grammars with
Ratfor actions, and produce Ratfor output on implies the
flag. Typical usage is then rc y.tab.r other.o
‘‘LR Parsing’’, by A. V. Aho and S.
C. Johnson, Computing Surveys, June, 1974. ‘‘The
YACC Compiler-compiler’’, internal memorandum.
S. C. Johnson y.output
y.tab.c
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y.tab.r |
when ratfor output is obtained |
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yacc.tmp |
when optimizer is called |
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/lib/liby.a |
runtime library for compiler |
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/usr/yacc/fpar.r |
ratfor parser |
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/usr/yacc/opar.c |
parser for optimized tables |
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/usr/yacc/yopti |
optimizer postpass The number of reduce-reduce and shift-reduce conflicts is reported on the standard output; a more detailed report is found in the file. Because file names are fixed, at most one Yacc process can be active in a given directory at a time. |
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yacc(1) | |