bison - GNU Project parser generator (yacc replacement)
[ -b file-prefix
] [ -d
] [ --defines
] [ --no-lines
] [ -o outfile
] [ -p prefix
] [ -t
] [ --debug
] [ --verbose
] [ -V
] [ --version
] [ --yacc
] [ --fixed-output-files
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
, the generated files do not have fixed names, but instead
use the prefix of the input file. For instance, a grammar description file
would produce the generated parser in a file named
, instead of yacc
This description of the options that can be given to bison
from the node Invocation
in the bison.texinfo
should be taken as authoritative.
supports both traditional single-letter options and mnemonic long
option names. Long option names are indicated with --
. 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 =
- -b file-prefix
- Specify a prefix to use for all bison output file
names. The names are chosen as if the input file were named
- 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
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.
- Don't put any #line preprocessor commands in the
parser file. Ordinarily bison puts them in the parser file so that
the C compiler 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.
- -o 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
- 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.
- Output a definition of the macro YYDEBUG into the
parser file, so that the debugging facilities are compiled.
- Write an extra output file containing verbose descriptions
of the parser states and what is done for each type of look-ahead token in
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 output file is
- Print the version number of bison.
- 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:
The long-named options can be introduced with `+' as well as `--', for
compatibility with previous releases. Eventually support for `+' will be
removed, because it is incompatible with the POSIX.2 standard.
/usr/local/lib/bison.simple simple parser
/usr/local/lib/bison.hairy complicated parser
The Bison Reference Manual
, included as the file bison.texinfo