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BISON(1)                    General Commands Manual                   BISON(1)



NAME
       bison - GNU Project parser generator (yacc replacement)

SYNOPSIS
       bison  [  -b  file-prefix  ]  [  --file-prefix=file-prefix  ]  [ -d ] [
       --defines=defines-file ] [ -g  ]  [  --graph=graph-file  ]  [  -k  ]  [
       --token-table  ] [ -l ] [ --no-lines ] [ -n ] [ --no-parser ] [ -o out-
       file ] [ --output-file=outfile ] [ -p prefix ] [ --name-prefix=prefix ]
       [  -t  ] [ --debug ] [ -v ] [ --verbose ] [ -V ] [ --version ] [ -y ] [
       --yacc ] [ -h ] [ --help ] [ --fixed-output-files ] file
       yacc [ similar options and operands ]

DESCRIPTION
       Bison is a parser generator in the style  of  yacc(1).   It  should  be
       upwardly compatible with input files designed for yacc.

       Input  files should follow the yacc convention of ending in .y.  Unlike
       yacc, the generated files do not have fixed names, but instead use  the
       prefix of the input file.  Moreover, if you need to put C++ code in the
       input file, you can end his name  by  a  C++-like  extension  (.ypp  or
       .y++),  then  bison  will follow your extension to name the output file
       (.cpp or  .c++).   For  instance,  a  grammar  description  file  named
       parse.yxx   would   produce  the  generated  parser  in  a  file  named
       parse.tab.cxx,  instead  of  yacc's  y.tab.c  or  old  Bison  version's
       parse.tab.c.

       This  description  of the options that can be given to bison is adapted
       from the node Invocation in the bison.texinfo manual, which  should  be
       taken as authoritative.

       Bison supports both traditional single-letter options and mnemonic long
       option names.  Long option names are indicated with --  instead  of  -.
       Abbreviations  for option names are allowed as long as they are unique.
       When a long option takes an argument, like --file-prefix,  connect  the
       option name and the argument with =.

   OPTIONS
       -b file-prefix
       --file-prefix=file-prefix
              Specify  a  prefix  to use for all bison output file names.  The
              names are chosen as if the input file were named file-prefix.c.

       -d
              Write an extra output file containing macro definitions for  the
              token  type  names defined in the grammar and the semantic value
              type YYSTYPE, as well as a few extern variable declarations.

              If the parser output file is named  name.c  then  this  file  is
              named name.h.

              This  output file is essential if you wish to put the definition
              of yylex in a separate source file, because yylex  needs  to  be
              able to refer to token type codes and the variable yylval.

       --defines=defines-file
              The  behavior of --defines is the same than -d option.  The only
              difference is that it has an optional argument which is the name
              of the output filename.

       -g
              Output  a  VCG  definition of the LALR(1) grammar automaton com-
              puted by Bison.  If the grammar file is foo.y , the  VCG  output
              file will be foo.vcg.

       --graph=graph-file
              The  behavior  of  --graph is the same than -g option.  The only
              difference is that it has an optional argument which is the name
              of the output graph filename.

       -k
       --token-table
              This  switch  causes  the name.tab.c output to include a list of
              token names in order by their token numbers; this is defined  in
              the  array  yytname.  Also generated are #defines for YYNTOKENS,
              YYNNTS, YYNRULES, and YYNSTATES.

       -l
       --no-lines
              Don't put any #line preprocessor commands in  the  parser  file.
              Ordinarily bison puts them in the parser file so that the C com-
              piler and debuggers will associate errors with your source file,
              the  grammar  file.  This option causes them to associate errors
              with the parser file, treating it an independent source file  in
              its own right.

       -n
       --no-parser
              Do  not  generate the parser code into the output; generate only
              declarations.  The generated name.tab.c file will have only con-
              stant  declarations.   In addition, a name.act file is generated
              containing a switch statement body containing all the translated
              actions.

       -o outfile
       --output-file=outfile
              Specify the name outfile for the parser file.

              The  other  output  files' names are constructed from outfile as
              described under the -v and -d switches.

       -p prefix
       --name-prefix=prefix
              Rename the external symbols used in  the  parser  so  that  they
              start  with  prefix  instead of yy.  The precise list of symbols
              renamed is yyparse, yylex, yyerror, yylval, yychar, and yydebug.

              For example, if you use -p c, the names become cparse, clex, and
              so on.

       -t
       --debug
              In  the  parser file, define the macro YYDEBUG to 1 if it is not
              already defined, so that the debugging facilities are compiled.

       -v
       --verbose
              Write an extra output file containing  verbose  descriptions  of
              the  parser  states and what is done for each type of look-ahead
              token in that state.

              This file also describes all the conflicts, both those  resolved
              by operator precedence and the unresolved ones.

              The file's name is made by removing .tab.c or .c from the parser
              output file name, and adding .output instead.

              Therefore, if the input file is foo.y, then the parser  file  is
              called foo.tab.c by default.  As a consequence, the verbose out-
              put file is called foo.output.

       -V
       --version
              Print the version number of bison and exit.

       -h
       --help Print a summary of the options to bison and exit.

       -y
       --yacc
       --fixed-output-files
              Equivalent to -o y.tab.c;  the  parser  output  file  is  called
              y.tab.c,  and the other outputs are called y.output and y.tab.h.
              The purpose of this switch is to imitate yacc's output file name
              conventions.   Thus,  the  following shell script can substitute
              for yacc and is often installed as yacc:

              bison -y "$@"


SEE ALSO
       yacc(1)
       The Bison Reference Manual, included as the file bison.texinfo  in  the
       bison source distribution.

DIAGNOSTICS
       Self explanatory.



                                     local                            BISON(1)