1YACC(1)                     General Commands Manual                    YACC(1)
2
3
4

NAME

6       Yacc - an LALR(1) parser generator
7

SYNOPSIS

9       yacc [ -dglrtv ] [ -b file_prefix ] [ -p symbol_prefix ] filename
10

DESCRIPTION

12       Yacc reads the grammar specification in the file filename and generates
13       an LALR(1) parser for it.  The parsers consist  of  a  set  of  LALR(1)
14       parsing  tables  and a driver routine written in the C programming lan‐
15       guage.  Yacc normally writes the parse tables and the driver routine to
16       the file y.tab.c.
17
18       The following options are available:
19
20              -b file_prefix
21                     The  -b option changes the prefix prepended to the output
22                     file names to the string  denoted  by  file_prefix.   The
23                     default prefix is the character y.
24
25              -d     The  -d option causes the header file y.tab.h to be writ‐
26                     ten.
27
28              -g     The -g option causes a graphical description of the  gen‐
29                     erated  LALR(1) parser to be written to the file y.dot in
30                     graphviz format, ready to be processed by dot(1).
31
32              -l     If the -l option is not specified, yacc will insert #line
33                     directives  in  the generated code.  The #line directives
34                     let the C compiler relate errors in the generated code to
35                     the user's original code.  If the -l option is specified,
36                     yacc will not insert the #line directives.  #line  direc‐
37                     tives specified by the user will be retained.
38
39              -o output_file
40                     specify the filename for the parser file.  If this option
41                     is not given, the output filename is the file prefix con‐
42                     catenated  with  the  file  suffix,  e.g., y.tab.c.  This
43                     overrides the -p option.
44
45              -p symbol_prefix
46                     The -p option changes the prefix prepended to yacc-gener‐
47                     ated symbols to the string denoted by symbol_prefix.  The
48                     default prefix is the string yy.
49
50              -r     The -r option causes yacc to produce separate  files  for
51                     code  and  tables.   The code file is named y.code.c, and
52                     the tables file is named y.tab.c.
53
54              -t     The -t option changes the preprocessor directives  gener‐
55                     ated  by yacc so that debugging statements will be incor‐
56                     porated in the compiled code.
57
58              -v     The -v option causes a human-readable description of  the
59                     generated parser to be written to the file y.output.
60
61              -V     print the version number to the standard output.
62

DIAGNOSTICS

64       If  there are rules that are never reduced, the number of such rules is
65       reported on standard error.  If there are any  LALR(1)  conflicts,  the
66       number of conflicts is reported on standard error.
67
68
69
704.3 Berkeley Distribution        July 15, 1990                         YACC(1)