# Exercising Bison Grammar Reduction. -*- Autotest -*-
-# Copyright (C) 2001-2002, 2007-2012 Free Software Foundation, Inc.
+# Copyright (C) 2001-2002, 2007-2015 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
useless9: '9';
]])
-AT_BISON_CHECK([[input.y]], 0, [],
+AT_BISON_CHECK([[-fcaret input.y]], 0, [],
[[input.y: warning: 9 nonterminals useless in grammar [-Wother]
input.y: warning: 9 rules useless in grammar [-Wother]
input.y:6.1-8: warning: nonterminal useless in grammar: useless1 [-Wother]
+ useless1: '1';
+ ^^^^^^^^
input.y:7.1-8: warning: nonterminal useless in grammar: useless2 [-Wother]
+ useless2: '2';
+ ^^^^^^^^
input.y:8.1-8: warning: nonterminal useless in grammar: useless3 [-Wother]
+ useless3: '3';
+ ^^^^^^^^
input.y:9.1-8: warning: nonterminal useless in grammar: useless4 [-Wother]
+ useless4: '4';
+ ^^^^^^^^
input.y:10.1-8: warning: nonterminal useless in grammar: useless5 [-Wother]
+ useless5: '5';
+ ^^^^^^^^
input.y:11.1-8: warning: nonterminal useless in grammar: useless6 [-Wother]
+ useless6: '6';
+ ^^^^^^^^
input.y:12.1-8: warning: nonterminal useless in grammar: useless7 [-Wother]
+ useless7: '7';
+ ^^^^^^^^
input.y:13.1-8: warning: nonterminal useless in grammar: useless8 [-Wother]
+ useless8: '8';
+ ^^^^^^^^
input.y:14.1-8: warning: nonterminal useless in grammar: useless9 [-Wother]
-input.y:6.11-13: warning: rule useless in grammar: useless1: '1' [-Wother]
-input.y:7.11-13: warning: rule useless in grammar: useless2: '2' [-Wother]
-input.y:8.11-13: warning: rule useless in grammar: useless3: '3' [-Wother]
-input.y:9.11-13: warning: rule useless in grammar: useless4: '4' [-Wother]
-input.y:10.11-13: warning: rule useless in grammar: useless5: '5' [-Wother]
-input.y:11.11-13: warning: rule useless in grammar: useless6: '6' [-Wother]
-input.y:12.11-13: warning: rule useless in grammar: useless7: '7' [-Wother]
-input.y:13.11-13: warning: rule useless in grammar: useless8: '8' [-Wother]
-input.y:14.11-13: warning: rule useless in grammar: useless9: '9' [-Wother]
+ useless9: '9';
+ ^^^^^^^^
+input.y:6.11-13: warning: rule useless in grammar [-Wother]
+ useless1: '1';
+ ^^^
+input.y:7.11-13: warning: rule useless in grammar [-Wother]
+ useless2: '2';
+ ^^^
+input.y:8.11-13: warning: rule useless in grammar [-Wother]
+ useless3: '3';
+ ^^^
+input.y:9.11-13: warning: rule useless in grammar [-Wother]
+ useless4: '4';
+ ^^^
+input.y:10.11-13: warning: rule useless in grammar [-Wother]
+ useless5: '5';
+ ^^^
+input.y:11.11-13: warning: rule useless in grammar [-Wother]
+ useless6: '6';
+ ^^^
+input.y:12.11-13: warning: rule useless in grammar [-Wother]
+ useless7: '7';
+ ^^^
+input.y:13.11-13: warning: rule useless in grammar [-Wother]
+ useless8: '8';
+ ^^^
+input.y:14.11-13: warning: rule useless in grammar [-Wother]
+ useless9: '9';
+ ^^^
]])
+
AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
[[Nonterminals useless in grammar
useless1
%%
]])
-AT_BISON_CHECK([[not-reduced.y]], 0, [],
+AT_BISON_CHECK([[-fcaret not-reduced.y]], 0, [],
[[not-reduced.y: warning: 2 nonterminals useless in grammar [-Wother]
not-reduced.y: warning: 3 rules useless in grammar [-Wother]
not-reduced.y:14.1-13: warning: nonterminal useless in grammar: not_reachable [-Wother]
+ not_reachable: useful { /* A not reachable action. */ }
+ ^^^^^^^^^^^^^
not-reduced.y:11.6-19: warning: nonterminal useless in grammar: non_productive [-Wother]
-not-reduced.y:11.6-57: warning: rule useless in grammar: exp: non_productive [-Wother]
-not-reduced.y:14.16-56: warning: rule useless in grammar: not_reachable: useful [-Wother]
-not-reduced.y:17.17-18.63: warning: rule useless in grammar: non_productive: non_productive useless_token [-Wother]
+ | non_productive { /* A non productive action. */ }
+ ^^^^^^^^^^^^^^
+not-reduced.y:11.6-57: warning: rule useless in grammar [-Wother]
+ | non_productive { /* A non productive action. */ }
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+not-reduced.y:14.16-56: warning: rule useless in grammar [-Wother]
+ not_reachable: useful { /* A not reachable action. */ }
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+not-reduced.y:17.17-18.63: warning: rule useless in grammar [-Wother]
+ non_productive: non_productive useless_token
+ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
]])
AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' not-reduced.output]], 0,
input.y: warning: 3 rules useless in grammar [-Wother]
input.y:5.15-25: warning: nonterminal useless in grammar: underivable [-Wother]
input.y:6.14-24: warning: nonterminal useless in grammar: indirection [-Wother]
-input.y:5.15-25: warning: rule useless in grammar: exp: underivable [-Wother]
-input.y:6.14-24: warning: rule useless in grammar: underivable: indirection [-Wother]
-input.y:7.14-24: warning: rule useless in grammar: indirection: underivable [-Wother]
+input.y:5.15-25: warning: rule useless in grammar [-Wother]
+input.y:6.14-24: warning: rule useless in grammar [-Wother]
+input.y:7.14-24: warning: rule useless in grammar [-Wother]
]])
AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
A: 'a' 'a' B
;
B: 'a'
- | %prec 'a'
+ | %empty %prec 'a'
;
c: 'a' 'a' 'b'
| A
4 A: 'a' 'a' . B
5 B: . 'a'
- 6 | . ]AT_COND_CASE([[LALR]], [[['a', 'b']]], [[['a']]])[
+ 6 | . %empty ]AT_COND_CASE([[LALR]], [[['a', 'b']]], [[['a']]])[
]AT_COND_CASE([[canonical LR]], [['a']],
[[$default]])[ reduce using rule 6 (B)
4 A: 'a' 'a' . B
5 B: . 'a'
- 6 | . [$end]
+ 6 | . %empty [$end]
7 c: 'a' 'a' . 'b'
'a' shift, and go to state ]AT_COND_CASE([[canonical LR]], [[20]],
4 A: 'a' 'a' . B
5 B: . 'a'
- 6 | . ['b']
+ 6 | . %empty ['b']
'a' shift, and go to state ]AT_COND_CASE([[canonical LR]], [[23]],
[[16]])[
and multiple reductions. The first reduction has more lookaheads than the
second, so the first should always be preferred as the default reduction if
enabled. The second reduction has one lookahead. */
-b: ;
-c: ;
+b: %empty;
+c: %empty;
]],
dnl Visit each state mentioned above.
[['a', 'a']],
1 start: a . b
2 | a . b 'a'
3 | a . c 'b'
- 5 b: . [$end, 'a']
- 6 c: . ['b']]AT_COND_CASE([[most]], [[
+ 5 b: . %empty [$end, 'a']
+ 6 c: . %empty ['b']]AT_COND_CASE([[most]], [[
'b' reduce using rule 6 (c)
$default reduce using rule 5 (b)]], [[
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