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1989-05-18
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YACC User Commands YACC
NNAAMMEE
yacc - yet another compiler-compiler
SSYYNNOOPPSSIISS
yyaacccc [ --vvdd ] grammar
DDEESSCCRRIIPPTTIIOONN
_Y_a_c_c converts a context-free grammar into a set of tables
for a simple automaton which executes an LR(1) parsing algo-
rithm. The grammar may be ambiguous; specified precedence
rules are used to break ambiguities.
The output file, _y._t_a_b._c, must be compiled by the C compiler
to produce a program _y_y_p_a_r_s_e. This program must be loaded
with the lexical analyzer program, _y_y_l_e_x, as well as _m_a_i_n
and _y_y_e_r_r_o_r, an error handling routine. These routines must
be supplied by the user; _L_e_x(1) is useful for creating lexi-
cal analyzers usable by _y_a_c_c.
If the --vv flag is given, the file _y._o_u_t_p_u_t is prepared,
which contains a description of the parsing tables and a
report on conflicts generated by ambiguities in the grammar.
If the -dd flag is used, the file _y._t_a_b._h is generated with
the _d_e_f_i_n_e statements that associate the _y_a_c_c-assigned
`token codes' with the user-declared `token names'. This
allows source files other than _y._t_a_b._c to access the token
codes.
FFIILLEESS
y.output
y.tab.c
y.tab.h defines for token names
yacc.tmp, yacc.acts temporary files
/usr/lib/yaccpar parser prototype for C programs
SSEEEE AALLSSOO
_l_e_x(1)
_L_R _P_a_r_s_i_n_g by A. V. Aho and S. C. Johnson, Computing Sur-
veys, June, 1974.
_Y_A_C_C - _Y_e_t _A_n_o_t_h_e_r _C_o_m_p_i_l_e_r _C_o_m_p_i_l_e_r by S. C. Johnson.
DDIIAAGGNNOOSSTTIICCSS
The number of reduce-reduce and shift-reduce conflicts is
reported on the standard output; a more detailed report is
found in the _y._o_u_t_p_u_t file. Similarly, if some rules are
not reachable from the start symbol, this is also reported.
BBUUGGSS
Because file names are fixed, at most one _y_a_c_c process can
be active in a given directory at a time.
Sprite v1.0 April 29, 1985 1