mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
6b98e4b563
* src/gram.h, src/gram.c (grammar_rhs_print, grammar_rules_print): New. Don't print the rules' location, it is confusing and useless. (rule_print): Use grammar_rhs_print. * src/print.c (print_grammar): Use grammar_rules_print.
406 lines
6.7 KiB
Plaintext
406 lines
6.7 KiB
Plaintext
# Exercising Bison on conflicts. -*- Autotest -*-
|
|
# Copyright (C) 2002 Free Software Foundation, Inc.
|
|
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2, or (at your option)
|
|
# any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
# 02111-1307, USA.
|
|
|
|
AT_BANNER([[Conflicts.]])
|
|
|
|
|
|
## ---------------- ##
|
|
## S/R in initial. ##
|
|
## ---------------- ##
|
|
|
|
# I once hacked Bison in such a way that it lost its reductions on the
|
|
# initial state (because it was confusing it with the last state). It
|
|
# took me a while to strip down my failures to this simple case. So
|
|
# make sure it finds the s/r conflict below.
|
|
|
|
AT_SETUP([S/R in initial])
|
|
|
|
AT_DATA([[input.y]],
|
|
[[%expect 1
|
|
%%
|
|
exp: e 'e';
|
|
e: 'e' | /* Nothing. */;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c])
|
|
|
|
AT_CLEANUP
|
|
|
|
## ------------------- ##
|
|
## %nonassoc and eof. ##
|
|
## ------------------- ##
|
|
|
|
AT_SETUP([%nonassoc and eof])
|
|
|
|
AT_DATA([input.y],
|
|
[[
|
|
%{
|
|
#include <config.h>
|
|
/* We don't need a perfect malloc for these tests. */
|
|
#undef malloc
|
|
#include <stdio.h>
|
|
|
|
#if STDC_HEADERS
|
|
# include <stdlib.h>
|
|
#endif
|
|
|
|
#define YYERROR_VERBOSE 1
|
|
static void
|
|
yyerror (const char *msg)
|
|
{
|
|
fprintf (stderr, "%s\n", msg);
|
|
exit (1);
|
|
}
|
|
|
|
/* The current argument. */
|
|
static const char *input = NULL;
|
|
|
|
static int
|
|
yylex (void)
|
|
{
|
|
/* No token stands for end of file. */
|
|
if (input && *input)
|
|
return *input++;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
%}
|
|
|
|
%nonassoc '<' '>'
|
|
|
|
%%
|
|
expr: expr '<' expr
|
|
| expr '>' expr
|
|
| '0'
|
|
;
|
|
%%
|
|
int
|
|
main (int argc, const char *argv[])
|
|
{
|
|
if (argc > 1)
|
|
input = argv[1];
|
|
return yyparse ();
|
|
}
|
|
]])
|
|
|
|
# Specify the output files to avoid problems on different file systems.
|
|
AT_CHECK([bison input.y -o input.c])
|
|
AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore])
|
|
|
|
AT_CHECK([./input '0<0'])
|
|
# FIXME: This is an actual bug, but a new one, in the sense that
|
|
# no one has ever spotted it! The messages are *wrong*: there should
|
|
# be nothing there, it should be expected eof.
|
|
AT_CHECK([./input '0<0<0'], [1], [],
|
|
[parse error, unexpected '<', expecting '<' or '>'
|
|
])
|
|
|
|
AT_CHECK([./input '0>0'])
|
|
AT_CHECK([./input '0>0>0'], [1], [],
|
|
[parse error, unexpected '>', expecting '<' or '>'
|
|
])
|
|
|
|
AT_CHECK([./input '0<0>0'], [1], [],
|
|
[parse error, unexpected '>', expecting '<' or '>'
|
|
])
|
|
|
|
AT_CLEANUP
|
|
|
|
|
|
|
|
## ------------------------- ##
|
|
## Unresolved SR Conflicts. ##
|
|
## ------------------------- ##
|
|
|
|
AT_SETUP([Unresolved SR Conflicts])
|
|
|
|
AT_KEYWORDS([report])
|
|
|
|
AT_DATA([input.y],
|
|
[[%token NUM OP
|
|
%%
|
|
exp: exp OP exp | NUM;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c --report=all], 0, [],
|
|
[input.y contains 1 shift/reduce conflict.
|
|
])
|
|
|
|
# Check the contents of the report.
|
|
AT_CHECK([cat input.output], [],
|
|
[[State 5 contains 1 shift/reduce conflict.
|
|
|
|
|
|
Grammar
|
|
|
|
0 $axiom: exp $
|
|
|
|
1 exp: exp OP exp
|
|
2 | NUM
|
|
|
|
|
|
Terminals, with rules where they appear
|
|
|
|
$ (0) 0
|
|
error (256)
|
|
NUM (258) 2
|
|
OP (259) 1
|
|
|
|
|
|
Nonterminals, with rules where they appear
|
|
|
|
$axiom (5)
|
|
on left: 0
|
|
exp (6)
|
|
on left: 1 2, on right: 0 1
|
|
|
|
|
|
state 0
|
|
|
|
$axiom -> . exp $ (rule 0)
|
|
exp -> . exp OP exp (rule 1)
|
|
exp -> . NUM (rule 2)
|
|
|
|
NUM shift, and go to state 1
|
|
|
|
exp go to state 2
|
|
|
|
|
|
|
|
state 1
|
|
|
|
exp -> NUM . (rule 2)
|
|
|
|
$default reduce using rule 2 (exp)
|
|
|
|
|
|
|
|
state 2
|
|
|
|
$axiom -> exp . $ (rule 0)
|
|
exp -> exp . OP exp (rule 1)
|
|
|
|
$ shift, and go to state 3
|
|
OP shift, and go to state 4
|
|
|
|
|
|
|
|
state 3
|
|
|
|
$axiom -> exp $ . (rule 0)
|
|
|
|
$default accept
|
|
|
|
|
|
state 4
|
|
|
|
exp -> . exp OP exp (rule 1)
|
|
exp -> exp OP . exp (rule 1)
|
|
exp -> . NUM (rule 2)
|
|
|
|
NUM shift, and go to state 1
|
|
|
|
exp go to state 5
|
|
|
|
|
|
|
|
state 5
|
|
|
|
exp -> exp . OP exp [$, OP] (rule 1)
|
|
exp -> exp OP exp . [$, OP] (rule 1)
|
|
|
|
OP shift, and go to state 4
|
|
|
|
OP [reduce using rule 1 (exp)]
|
|
$default reduce using rule 1 (exp)
|
|
|
|
|
|
|
|
]])
|
|
|
|
AT_CLEANUP
|
|
|
|
|
|
## --------------------- ##
|
|
## Solved SR Conflicts. ##
|
|
## --------------------- ##
|
|
|
|
AT_SETUP([Solved SR Conflicts])
|
|
|
|
AT_KEYWORDS([report])
|
|
|
|
AT_DATA([input.y],
|
|
[[%token NUM OP
|
|
%right OP
|
|
%%
|
|
exp: exp OP exp | NUM;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c --report=all], 0, [], [])
|
|
|
|
# Check the contents of the report.
|
|
AT_CHECK([cat input.output], [],
|
|
[[Grammar
|
|
|
|
0 $axiom: exp $
|
|
|
|
1 exp: exp OP exp
|
|
2 | NUM
|
|
|
|
|
|
Terminals, with rules where they appear
|
|
|
|
$ (0) 0
|
|
error (256)
|
|
NUM (258) 2
|
|
OP (259) 1
|
|
|
|
|
|
Nonterminals, with rules where they appear
|
|
|
|
$axiom (5)
|
|
on left: 0
|
|
exp (6)
|
|
on left: 1 2, on right: 0 1
|
|
|
|
|
|
state 0
|
|
|
|
$axiom -> . exp $ (rule 0)
|
|
exp -> . exp OP exp (rule 1)
|
|
exp -> . NUM (rule 2)
|
|
|
|
NUM shift, and go to state 1
|
|
|
|
exp go to state 2
|
|
|
|
|
|
|
|
state 1
|
|
|
|
exp -> NUM . (rule 2)
|
|
|
|
$default reduce using rule 2 (exp)
|
|
|
|
|
|
|
|
state 2
|
|
|
|
$axiom -> exp . $ (rule 0)
|
|
exp -> exp . OP exp (rule 1)
|
|
|
|
$ shift, and go to state 3
|
|
OP shift, and go to state 4
|
|
|
|
|
|
|
|
state 3
|
|
|
|
$axiom -> exp $ . (rule 0)
|
|
|
|
$default accept
|
|
|
|
|
|
state 4
|
|
|
|
exp -> . exp OP exp (rule 1)
|
|
exp -> exp OP . exp (rule 1)
|
|
exp -> . NUM (rule 2)
|
|
|
|
NUM shift, and go to state 1
|
|
|
|
exp go to state 5
|
|
|
|
|
|
|
|
state 5
|
|
|
|
exp -> exp . OP exp [$] (rule 1)
|
|
exp -> exp OP exp . [$] (rule 1)
|
|
|
|
OP shift, and go to state 4
|
|
|
|
$default reduce using rule 1 (exp)
|
|
|
|
Conflict between rule 2 and token OP resolved as reduce (%right OP).
|
|
|
|
|
|
]])
|
|
|
|
AT_CLEANUP
|
|
|
|
|
|
|
|
|
|
## -------------------- ##
|
|
## %expect not enough. ##
|
|
## -------------------- ##
|
|
|
|
AT_SETUP([%expect not enough])
|
|
|
|
AT_DATA([input.y],
|
|
[[%token NUM OP
|
|
%expect 0
|
|
%%
|
|
exp: exp OP exp | NUM;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c], 1, [],
|
|
[input.y contains 1 shift/reduce conflict.
|
|
expected 0 shift/reduce conflicts
|
|
])
|
|
AT_CLEANUP
|
|
|
|
|
|
## --------------- ##
|
|
## %expect right. ##
|
|
## --------------- ##
|
|
|
|
AT_SETUP([%expect right])
|
|
|
|
AT_DATA([input.y],
|
|
[[%token NUM OP
|
|
%expect 1
|
|
%%
|
|
exp: exp OP exp | NUM;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c], 0)
|
|
AT_CLEANUP
|
|
|
|
|
|
## ------------------ ##
|
|
## %expect too much. ##
|
|
## ------------------ ##
|
|
|
|
AT_SETUP([%expect too much])
|
|
|
|
AT_DATA([input.y],
|
|
[[%token NUM OP
|
|
%expect 2
|
|
%%
|
|
exp: exp OP exp | NUM;
|
|
]])
|
|
|
|
AT_CHECK([bison input.y -o input.c], 1, [],
|
|
[input.y contains 1 shift/reduce conflict.
|
|
expected 2 shift/reduce conflicts
|
|
])
|
|
AT_CLEANUP
|