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cex: display shifts before reductions

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When reporting counterexamples for s/r conflicts, put the shift first.
This is more natural, and displays the default resolution first, which
is also what happens for r/r conflicts where the smallest rule number
is displayed first, and "wins".

* src/counterexample.c (counterexample): Add a shift_reduce member.
(new_counterexample): Adjust.
Swap the derivations when this is a s/r conflict.
(print_counterexample): For s/r conflicts, prefer "Shift derivation"
and "Reduce derivation" rather than "First/Second derivation".

* tests/conflicts.at, tests/counterexample.at, tests/report.at: Adjust.
* NEWS, doc/bison.texi: Ditto.
This commit is contained in:
Akim Demaille
2020-07-12 18:53:30 +02:00
parent 78f72a4516
commit 4f9ae5de07
7 changed files with 146 additions and 128 deletions
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14
NEWS
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@@ -2,6 +2,8 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?] * Noteworthy changes in release ?.? (????-??-??) [?]
Changes in the display of counterexamples.
** Documentation ** Documentation
*** Examples *** Examples
@@ -45,8 +47,8 @@ GNU Bison NEWS
conflict. For example: conflict. For example:
Example exp '+' exp • '/' exp Example exp '+' exp • '/' exp
First derivation exp → [ exp → [ exp '+' exp • ] '/' exp ] Shift derivation exp → [ exp '+' exp → [ exp • '/' exp ] ]
Second derivation exp → [ exp '+' exp → [ exp • '/' exp ] ] Reduce derivation exp → [ exp → [ exp '+' exp • ] '/' exp ]
When Bison is installed with text styling enabled, the example is actually When Bison is installed with text styling enabled, the example is actually
shown twice, with colors highlighting the ambiguity. shown twice, with colors highlighting the ambiguity.
@@ -56,10 +58,10 @@ GNU Bison NEWS
bison cannot find an example that can be derived in two ways, it instead bison cannot find an example that can be derived in two ways, it instead
generates two examples that are the same up until the dot: generates two examples that are the same up until the dot:
First example expr • ID $end First example expr • ID ',' ID $end
First derivation $accept → [ s → [ a → [ expr • ] ID ] $end ] Shift derivation $accept → [ s → [ a → [ expr → [ expr • ID ',' ] ] ID ] $end ]
Second example expr • ID ',' ID $end Second example expr • ID $end
Second derivation $accept → [ s → [ a → [ expr → [ expr • ID ',' ] ] ID ] $end ] Reduce derivation $accept → [ s → [ a → [ expr • ] ID ] $end ]
In these cases, the parser usually doesn't have enough lookahead to In these cases, the parser usually doesn't have enough lookahead to
differentiate the two given examples. differentiate the two given examples.

42
doc/bison.texi
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@@ -9936,10 +9936,10 @@ output is actually in color)}:
@example @example
Shift/reduce conflict on token "else": Shift/reduce conflict on token "else":
@group @group
Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
First derivation @yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{]} @green{]} @yellow{"else" stmt ]}
Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt} Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt}
Second derivation @yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]} @green{]} @yellow{]} Shift derivation @yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]} @green{]} @yellow{]}
Example @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
Reduce derivation @yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{]} @green{]} @yellow{"else" stmt ]}
@end group @end group
@end example @end example
@end ifhtml @end ifhtml
@@ -9947,14 +9947,14 @@ Shift/reduce conflict on token "else":
@smallexample @smallexample
Shift/reduce conflict on token "else": Shift/reduce conflict on token "else":
@group @group
Example
@yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
First derivation
@yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{]} @green{]} @yellow{"else" stmt ]}
Example Example
@yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt} @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt}
Second derivation Shift derivation
@yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]} @green{]} @yellow{]} @yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{"else" stmt ]} @green{]} @yellow{]}
Example
@yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
Reduce derivation
@yellow{if_stmt @arrow{} [ "if" expr "then"} @green{stmt @arrow{} [} @blue{if_stmt @arrow{} [ "if" expr "then" stmt} @red{•} @blue{]} @green{]} @yellow{"else" stmt ]}
@end group @end group
@end smallexample @end smallexample
@end ifnothtml @end ifnothtml
@@ -9987,10 +9987,10 @@ $ @kbd{bison -Wcex sequence.y}
sequence.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}] sequence.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}]
sequence.y: @dwarning{warning}: 2 reduce/reduce conflicts [@dwarning{-Wconflicts-rr}] sequence.y: @dwarning{warning}: 2 reduce/reduce conflicts [@dwarning{-Wconflicts-rr}]
Shift/reduce conflict on token "word": Shift/reduce conflict on token "word":
Example @red{•} @yellow{"word"}
First derivation @yellow{sequence @arrow{} [} @green{sequence @arrow{} [} @red{•} @green{]} @yellow{"word" ]}
Example @red{•} @green{"word"} Example @red{•} @green{"word"}
Second derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{"word" ]} @yellow{]} Shift derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{"word" ]} @yellow{]}
Example @red{•} @yellow{"word"}
Reduce derivation @yellow{sequence @arrow{} [} @green{sequence @arrow{} [} @red{•} @green{]} @yellow{"word" ]}
Reduce/reduce conflict on tokens $end, "word": Reduce/reduce conflict on tokens $end, "word":
Example @red{•} Example @red{•}
@@ -9999,10 +9999,10 @@ Reduce/reduce conflict on tokens $end, "word":
Second derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{]} @yellow{]} Second derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{]} @yellow{]}
Shift/reduce conflict on token "word": Shift/reduce conflict on token "word":
Example @red{•} @yellow{"word"}
First derivation @yellow{sequence @arrow{} [} @green{sequence @arrow{} [} @blue{maybeword @arrow{} [} @red{•} @blue{]} @green{]} @yellow{"word" ]}
Example @red{•} @green{"word"} Example @red{•} @green{"word"}
Second derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{"word" ]} @yellow{]} Shift derivation @yellow{sequence @arrow{} [} @green{maybeword @arrow{} [} @red{•} @green{"word" ]} @yellow{]}
Example @red{•} @yellow{"word"}
Reduce derivation @yellow{sequence @arrow{} [} @green{sequence @arrow{} [} @blue{maybeword @arrow{} [} @red{•} @blue{]} @green{]} @yellow{"word" ]}
sequence.y:8.3-45: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}] sequence.y:8.3-45: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}]
8 | @dwarning{%empty @{ printf ("empty maybeword\n"); @}} 8 | @dwarning{%empty @{ printf ("empty maybeword\n"); @}}
@@ -10033,10 +10033,10 @@ expr: %empty | expr ID ','
@smallexample @smallexample
Shift/reduce conflict on token ID: Shift/reduce conflict on token ID:
First example @blue{expr} @red{•} @green{ID} @yellow{$end} First example @purple{expr} @red{•} @purple{ID ','} @green{ID} @yellow{$end}
First derivation @yellow{$accept @arrow{} [} @green{s @arrow{} [} @blue{a @arrow{} [ expr} @red{•} @blue{]} @green{ID ]} @yellow{$end ]} Shift derivation @yellow{$accept @arrow{} [} @green{s @arrow{} [} @blue{a @arrow{} [} @purple{expr @arrow{} [ expr} @red{•} @purple{ID ',' ]} @blue{]} @green{ID ]} @yellow{$end ]}
Second example @purple{expr} @red{•} @purple{ID ','} @green{ID} @yellow{$end} Second example @blue{expr} @red{•} @green{ID} @yellow{$end}
Second derivation @yellow{$accept @arrow{} [} @green{s @arrow{} [} @blue{a @arrow{} [} @purple{expr @arrow{} [ expr} @red{•} @purple{ID ',' ]} @blue{]} @green{ID ]} @yellow{$end ]} Reduce derivation @yellow{$accept @arrow{} [} @green{s @arrow{} [} @blue{a @arrow{} [ expr} @red{•} @blue{]} @green{ID ]} @yellow{$end ]}
@end smallexample @end smallexample
This conflict is caused by the parser not having enough information to know This conflict is caused by the parser not having enough information to know
@@ -10432,10 +10432,10 @@ counterexamples within the report, augmented with the corresponding items
Shift/reduce conflict on token '/': Shift/reduce conflict on token '/':
1 exp: exp '+' exp • 1 exp: exp '+' exp •
4 exp: exp • '/' exp 4 exp: exp • '/' exp
Example @green{exp '+' exp} @red{•} @yellow{'/' exp}
First derivation @yellow{exp @arrow{} [} @green{exp @arrow{} [ exp '+' exp} @red{•} @green{]} @yellow{'/' exp ]}
Example @yellow{exp '+'} @green{exp} @red{•} @green{'/' exp} Example @yellow{exp '+'} @green{exp} @red{•} @green{'/' exp}
Second derivation @yellow{exp @arrow{} [ exp '+'} @green{exp @arrow{} [ exp} @red{•} @green{'/' exp ]} @yellow{]} Shift derivation @yellow{exp @arrow{} [ exp '+'} @green{exp @arrow{} [ exp} @red{•} @green{'/' exp ]} @yellow{]}
Example @green{exp '+' exp} @red{•} @yellow{'/' exp}
Reduce derivation @yellow{exp @arrow{} [} @green{exp @arrow{} [ exp '+' exp} @red{•} @green{]} @yellow{'/' exp ]}
@end example @end example
This shows two separate derivations in the grammar for the same @code{exp}: This shows two separate derivations in the grammar for the same @code{exp}:

34
src/counterexample.c
View File

@@ -76,17 +76,29 @@ typedef struct
{ {
derivation *d1; derivation *d1;
derivation *d2; derivation *d2;
bool shift_reduce;
bool unifying; bool unifying;
bool timeout; bool timeout;
} counterexample; } counterexample;
static counterexample * static counterexample *
new_counterexample (derivation *d1, derivation *d2, new_counterexample (derivation *d1, derivation *d2,
bool shift_reduce,
bool u, bool t) bool u, bool t)
{ {
counterexample *res = xmalloc (sizeof *res); counterexample *res = xmalloc (sizeof *res);
res->d1 = d1; res->shift_reduce = shift_reduce;
res->d2 = d2; if (shift_reduce)
{
// Display the shift first.
res->d1 = d2;
res->d2 = d1;
}
else
{
res->d1 = d1;
res->d2 = d2;
}
res->unifying = u; res->unifying = u;
res->timeout = t; res->timeout = t;
return res; return res;
@@ -107,7 +119,7 @@ print_counterexample (counterexample *cex, FILE *out, const char *prefix)
prefix, cex->unifying ? _("Example") : _("First example")); prefix, cex->unifying ? _("Example") : _("First example"));
derivation_print_leaves (cex->d1, out, prefix); derivation_print_leaves (cex->d1, out, prefix);
fprintf (out, " %s%-20s ", fprintf (out, " %s%-20s ",
prefix, _("First derivation")); prefix, cex->shift_reduce ? _("Shift derivation") : _("First derivation"));
derivation_print (cex->d1, out, prefix); derivation_print (cex->d1, out, prefix);
// If we output to the terminal (via stderr) and we have color // If we output to the terminal (via stderr) and we have color
@@ -120,7 +132,7 @@ print_counterexample (counterexample *cex, FILE *out, const char *prefix)
derivation_print_leaves (cex->d2, out, prefix); derivation_print_leaves (cex->d2, out, prefix);
} }
fprintf (out, " %s%-20s ", fprintf (out, " %s%-20s ",
prefix, _("Second derivation")); prefix, cex->shift_reduce ? _("Reduce derivation") : _("Second derivation"));
derivation_print (cex->d2, out, prefix); derivation_print (cex->d2, out, prefix);
fputc ('\n', out); fputc ('\n', out);
@@ -506,7 +518,7 @@ example_from_path (bool shift_reduce,
: shortest_path_from_start (itm2, next_sym); : shortest_path_from_start (itm2, next_sym);
derivation *deriv2 = complete_diverging_example (next_sym, path_2, NULL); derivation *deriv2 = complete_diverging_example (next_sym, path_2, NULL);
gl_list_free (path_2); gl_list_free (path_2);
return new_counterexample (deriv1, deriv2, false, true); return new_counterexample (deriv1, deriv2, shift_reduce, false, true);
} }
/* /*
@@ -619,7 +631,8 @@ ss_set_parse_state (search_state *ss, int idx, parse_state *ps)
*/ */
static counterexample * static counterexample *
complete_diverging_examples (search_state *ss, complete_diverging_examples (search_state *ss,
symbol_number next_sym) symbol_number next_sym,
bool shift_reduce)
{ {
derivation *new_derivs[2]; derivation *new_derivs[2];
for (int i = 0; i < 2; ++i) for (int i = 0; i < 2; ++i)
@@ -630,7 +643,8 @@ complete_diverging_examples (search_state *ss,
new_derivs[i] = complete_diverging_example (next_sym, sitems, derivs); new_derivs[i] = complete_diverging_example (next_sym, sitems, derivs);
gl_list_free (sitems); gl_list_free (sitems);
} }
return new_counterexample (new_derivs[0], new_derivs[1], false, true); return new_counterexample (new_derivs[0], new_derivs[1],
shift_reduce, false, true);
} }
/* /*
@@ -1111,7 +1125,7 @@ unifying_example (state_item_number itm1,
{ {
// Once we have two derivations for the same symbol, // Once we have two derivations for the same symbol,
// we've found a unifying counterexample. // we've found a unifying counterexample.
cex = new_counterexample (d1, d2, true, false); cex = new_counterexample (d1, d2, shift_reduce, true, false);
derivation_retain (d1); derivation_retain (d1);
derivation_retain (d2); derivation_retain (d2);
goto cex_search_end; goto cex_search_end;
@@ -1149,7 +1163,7 @@ cex_search_end:;
// If a search state from Stage 3 is available, use it // If a search state from Stage 3 is available, use it
// to construct a more compact nonunifying counterexample. // to construct a more compact nonunifying counterexample.
if (stage3result) if (stage3result)
cex = complete_diverging_examples (stage3result, next_sym); cex = complete_diverging_examples (stage3result, next_sym, shift_reduce);
// Otherwise, construct a nonunifying counterexample that // Otherwise, construct a nonunifying counterexample that
// begins from the start state using the shortest // begins from the start state using the shortest
// lookahead-sensitive path to the reduce item. // lookahead-sensitive path to the reduce item.
@@ -1226,6 +1240,8 @@ counterexample_report (state_item_number itm1, state_item_number itm2,
free_counterexample (cex); free_counterexample (cex);
} }
// ITM1 denotes a shift, ITM2 a reduce.
static void static void
counterexample_report_shift_reduce (state_item_number itm1, state_item_number itm2, counterexample_report_shift_reduce (state_item_number itm1, state_item_number itm2,
symbol_number next_sym, symbol_number next_sym,

20
tests/conflicts.at
View File

@@ -865,8 +865,8 @@ State 5
1 exp: exp OP exp . 1 exp: exp OP exp .
1 exp: exp . OP exp 1 exp: exp . OP exp
Example exp OP exp . OP exp Example exp OP exp . OP exp
First derivation exp -> [ exp -> [ exp OP exp . ] OP exp ] Shift derivation exp -> [ exp OP exp -> [ exp . OP exp ] ]
Second derivation exp -> [ exp OP exp -> [ exp . OP exp ] ] Reduce derivation exp -> [ exp -> [ exp OP exp . ] OP exp ]
]]) ]])
@@ -1753,18 +1753,18 @@ State 4
Shift/reduce conflict on token 'a': Shift/reduce conflict on token 'a':
10 reported_conflicts: . %empty 10 reported_conflicts: . %empty
8 reported_conflicts: . 'a' 8 reported_conflicts: . 'a'
First example resolved_conflict . 'a' First example resolved_conflict . 'a' 'a'
First derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ] Shift derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ]
Second example resolved_conflict . 'a' 'a' Second example resolved_conflict . 'a'
Second derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ] Reduce derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ]
Shift/reduce conflict on token 'a': Shift/reduce conflict on token 'a':
10 reported_conflicts: . %empty 10 reported_conflicts: . %empty
9 reported_conflicts: . 'a' 9 reported_conflicts: . 'a'
First example resolved_conflict . 'a' First example resolved_conflict . 'a' 'a'
First derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ] Shift derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ]
Second example resolved_conflict . 'a' 'a' Second example resolved_conflict . 'a'
Second derivation start -> [ resolved_conflict reported_conflicts -> [ . 'a' ] 'a' ] Reduce derivation start -> [ resolved_conflict reported_conflicts -> [ . ] 'a' ]

100
tests/counterexample.at
View File

@@ -47,8 +47,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example A . B C Example A . B C
First derivation s -> [ a -> [ A . ] x -> [ B C ] ] Shift derivation s -> [ y -> [ A . B ] c -> [ C ] ]
Second derivation s -> [ y -> [ A . B ] c -> [ C ] ] Reduce derivation s -> [ a -> [ A . ] x -> [ B C ] ]
input.y:4.4: warning: rule useless in parser due to conflicts [-Wother] input.y:4.4: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -76,13 +76,13 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example A . B C Example A . B C
First derivation s -> [ a -> [ A . ] bc -> [ B C ] ] Shift derivation s -> [ ac -> [ A ac -> [ b -> [ . B ] ] C ] ]
Second derivation s -> [ ac -> [ A ac -> [ b -> [ . B ] ] C ] ] Reduce derivation s -> [ a -> [ A . ] bc -> [ B C ] ]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example A A . B B C C Example A A . B B C C
First derivation s -> [ a -> [ A a -> [ A . ] ] bc -> [ B bc -> [ B C ] C ] ] Shift derivation s -> [ ac -> [ A ac -> [ A ac -> [ b -> [ . b -> [ B B ] ] ] C ] C ] ]
Second derivation s -> [ ac -> [ A ac -> [ A ac -> [ b -> [ . b -> [ B B ] ] ] C ] C ] ] Reduce derivation s -> [ a -> [ A a -> [ A . ] ] bc -> [ B bc -> [ B C ] C ] ]
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother] input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -111,14 +111,14 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] [[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example A . B Example A . B
First derivation s -> [ ax -> [ A x -> [ . ] ] by -> [ B y -> [ ] ] ] Shift derivation s -> [ A xby -> [ . B ] ]
Second derivation s -> [ A xby -> [ . B ] ] Reduce derivation s -> [ ax -> [ A x -> [ . ] ] by -> [ B y -> [ ] ] ]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
First example A X . B y $end First example A X . B Y $end
First derivation $accept -> [ s -> [ ax -> [ A x -> [ X x -> [ . ] ] ] by -> [ B y ] ] $end ] Shift derivation $accept -> [ s -> [ A xby -> [ X xby -> [ . B ] Y ] ] $end ]
Second example A X . B Y $end Second example A X . B y $end
Second derivation $accept -> [ s -> [ A xby -> [ X xby -> [ . B ] Y ] ] $end ] Reduce derivation $accept -> [ s -> [ ax -> [ A x -> [ X x -> [ . ] ] ] by -> [ B y ] ] $end ]
input.y:5.4-9: warning: rule useless in parser due to conflicts [-Wother] input.y:5.4-9: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -146,10 +146,10 @@ bc: B C;
AT_BISON_CHECK_CEX([input.y], [], [], AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token C: Shift/reduce conflict on token C:
First example B . C D $end First example B . C $end
First derivation $accept -> [ g -> [ x -> [ b -> [ B . ] cd -> [ C D ] ] ] $end ] Shift derivation $accept -> [ g -> [ x -> [ bc -> [ B . C ] ] ] $end ]
Second example B . C $end Second example B . C D $end
Second derivation $accept -> [ g -> [ x -> [ bc -> [ B . C ] ] ] $end ] Reduce derivation $accept -> [ g -> [ x -> [ b -> [ B . ] cd -> [ C D ] ] ] $end ]
input.y:6.4: warning: rule useless in parser due to conflicts [-Wother] input.y:6.4: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -175,10 +175,10 @@ y: A A B;
AT_BISON_CHECK_CEX([input.y], [], [], AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token A: Shift/reduce conflict on token A:
First example A . A $end First example A . A B $end
First derivation $accept -> [ s -> [ s -> [ t -> [ x -> [ A . ] ] ] t -> [ x -> [ A ] ] ] $end ] Shift derivation $accept -> [ s -> [ t -> [ y -> [ A . A B ] ] ] $end ]
Second example A . A B $end Second example A . A $end
Second derivation $accept -> [ s -> [ t -> [ y -> [ A . A B ] ] ] $end ] Reduce derivation $accept -> [ s -> [ s -> [ t -> [ x -> [ A . ] ] ] t -> [ x -> [ A ] ] ] $end ]
]]) ]])
@@ -209,14 +209,14 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] [[input.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr]
Shift/reduce conflict on token A: Shift/reduce conflict on token A:
Example b . A X X Y Example b . A X X Y
First derivation a -> [ r -> [ b . ] t -> [ A x -> [ X ] xy -> [ X Y ] ] ] Shift derivation a -> [ s -> [ b . xx -> [ A X X ] y -> [ Y ] ] ]
Second derivation a -> [ s -> [ b . xx -> [ A X X ] y -> [ Y ] ] ] Reduce derivation a -> [ r -> [ b . ] t -> [ A x -> [ X ] xy -> [ X Y ] ] ]
Shift/reduce conflict on token X: Shift/reduce conflict on token X:
First example X . X xy First example A X . X
First derivation a -> [ x -> [ X . ] t -> [ X xy ] ] Shift derivation a -> [ t -> [ A xx -> [ X . X ] ] ]
Second example A X . X Second example X . X xy
Second derivation a -> [ t -> [ A xx -> [ X . X ] ] ] Reduce derivation a -> [ x -> [ X . ] t -> [ X xy ] ]
input.y:4.4: warning: rule useless in parser due to conflicts [-Wother] input.y:4.4: warning: rule useless in parser due to conflicts [-Wother]
input.y:8.4: warning: rule useless in parser due to conflicts [-Wother] input.y:8.4: warning: rule useless in parser due to conflicts [-Wother]
@@ -297,10 +297,10 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J: Shift/reduce conflict on token J:
time limit exceeded: XXX time limit exceeded: XXX
First example H i . J $end First example H i . J K $end
First derivation $accept -> [ s -> [ a -> [ H i . ] J ] $end ] Shift derivation $accept -> [ a -> [ H i -> [ i . J K ] ] $end ]
Second example H i . J K $end Second example H i . J $end
Second derivation $accept -> [ a -> [ H i -> [ i . J K ] ] $end ] Reduce derivation $accept -> [ s -> [ a -> [ H i . ] J ] $end ]
input.y:4.4-6: warning: rule useless in parser due to conflicts [-Wother] input.y:4.4-6: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -330,13 +330,13 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example N A . B C Example N A . B C
First derivation s -> [ n -> [ N a -> [ A . ] B ] C ] Shift derivation s -> [ n -> [ N b -> [ A . B C ] ] ]
Second derivation s -> [ n -> [ N b -> [ A . B C ] ] ] Reduce derivation s -> [ n -> [ N a -> [ A . ] B ] C ]
Shift/reduce conflict on token B: Shift/reduce conflict on token B:
Example N N A . B D C Example N N A . B D C
First derivation s -> [ n -> [ N n -> [ N a -> [ A . ] B ] D ] C ] Shift derivation s -> [ n -> [ N n -> [ N b -> [ A . B D ] ] C ] ]
Second derivation s -> [ n -> [ N n -> [ N b -> [ A . B D ] ] C ] ] Reduce derivation s -> [ n -> [ N n -> [ N a -> [ A . ] B ] D ] C ]
input.y:5.4: warning: rule useless in parser due to conflicts [-Wother] input.y:5.4: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -420,10 +420,10 @@ time limit exceeded: XXX
Shift/reduce conflict on token A: Shift/reduce conflict on token A:
time limit exceeded: XXX time limit exceeded: XXX
First example b c . c A A $end First example b c . A
First derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ a -> [ b -> [ . ] d -> [ c A A ] ] ] ] ] ] $end ] Shift derivation a -> [ b d -> [ c . A ] ]
Second example b c . A Second example b c . c A A $end
Second derivation a -> [ b d -> [ c . A ] ] Reduce derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ a -> [ b -> [ . ] d -> [ c A A ] ] ] ] ] ] $end ]
Reduce/reduce conflict on token A: Reduce/reduce conflict on token A:
First example b c . c A A $end First example b c . c A A $end
@@ -432,10 +432,10 @@ Reduce/reduce conflict on token A:
Second derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ] A ] ] ] ] $end ] Second derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ] A ] ] ] ] $end ]
Shift/reduce conflict on token A: Shift/reduce conflict on token A:
First example b c . A $end First example b c . A
First derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ] A ] ] ] ] $end ] Shift derivation a -> [ b d -> [ c . A ] ]
Second example b c . A Second example b c . A $end
Second derivation a -> [ b d -> [ c . A ] ] Reduce derivation $accept -> [ a -> [ b d -> [ a -> [ c d -> [ c -> [ . ] A ] ] ] ] $end ]
Reduce/reduce conflict on token $end: Reduce/reduce conflict on token $end:
Example b d . Example b d .
@@ -475,8 +475,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token J: Shift/reduce conflict on token J:
Example H i J . J J Example H i J . J J
First derivation s -> [ a -> [ H i -> [ i J . ] J J ] ] Shift derivation s -> [ a -> [ H i J . J ] J ]
Second derivation s -> [ a -> [ H i J . J ] J ] Reduce derivation s -> [ a -> [ H i -> [ i J . ] J J ] ]
input.y:5.13-15: warning: rule useless in parser due to conflicts [-Wother] input.y:5.13-15: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -507,8 +507,8 @@ AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D: Shift/reduce conflict on token D:
Example A a . D Example A a . D
First derivation s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d -> [ D ] ] Shift derivation s -> [ A a d -> [ . D ] ]
Second derivation s -> [ A a d -> [ . D ] ] Reduce derivation s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d -> [ D ] ]
]]) ]])
@@ -536,10 +536,10 @@ d: D;
AT_BISON_CHECK_CEX([input.y], [], [], AT_BISON_CHECK_CEX([input.y], [], [],
[[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] [[input.y: warning: 1 shift/reduce conflict [-Wconflicts-sr]
Shift/reduce conflict on token D: Shift/reduce conflict on token D:
First example A a . D E $end First example A a . D $end
First derivation $accept -> [ s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d -> [ D ] E ] $end ] Shift derivation $accept -> [ s -> [ A a d -> [ . D ] ] $end ]
Second example A a . D $end Second example A a . D E $end
Second derivation $accept -> [ s -> [ A a d -> [ . D ] ] $end ] Reduce derivation $accept -> [ s -> [ A a a -> [ b -> [ c -> [ . ] ] ] d -> [ D ] E ] $end ]
]]) ]])

24
tests/diagnostics.at
View File

@@ -534,28 +534,28 @@ exp
| "num" | "num"
]], ]],
[1], [1],
[[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected
Shift/reduce conflict on token "+":
[[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected [[input.y: <error>error:</error> shift/reduce conflicts: 4 found, 0 expected
First derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
Example <cex-0><cex-1><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0> Example <cex-0><cex-1><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
Shift/reduce conflict on token "else":
First derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Shift/reduce conflict on token "else":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0> Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
Shift/reduce conflict on token "+":
First derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0> Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>
Shift/reduce conflict on token "+":
First derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Shift/reduce conflict on token "+":
Example <cex-0><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-1></cex-0>
Shift derivation <cex-0><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf><cex-1> <cex-step>exp → [ </cex-step><cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-1><cex-step> ]</cex-step></cex-0>
Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0> Example <cex-0><cex-1><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf></cex-0>
Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0> Reduce derivation <cex-0><cex-step>exp → [ </cex-step><cex-1><cex-step>exp → [ </cex-step><cex-leaf>"if"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"then"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-leaf>"else"</cex-leaf> <cex-leaf>exp</cex-leaf> <cex-dot>•</cex-dot><cex-step> ]</cex-step></cex-1> <cex-leaf>"+"</cex-leaf> <cex-leaf>exp</cex-leaf><cex-step> ]</cex-step></cex-0>

40
tests/report.at
View File

@@ -1539,8 +1539,8 @@ AT_CHECK([LC_ALL="$locale" bison -fno-caret -o input.cc -rall -Wcex --graph=inpu
input.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr] input.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr]
Shift/reduce conflict on token "⊕": Shift/reduce conflict on token "⊕":
Example exp "+" exp • "⊕" exp Example exp "+" exp • "⊕" exp
First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ] Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Reduce/reduce conflict on tokens $end, "+", "⊕": Reduce/reduce conflict on tokens $end, "+", "⊕":
Example exp "+" exp • Example exp "+" exp •
@@ -1549,23 +1549,23 @@ Reduce/reduce conflict on tokens $end, "+", "⊕":
Shift/reduce conflict on token "⊕": Shift/reduce conflict on token "⊕":
Example exp "+" exp • "⊕" exp Example exp "+" exp • "⊕" exp
First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ] Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Shift/reduce conflict on token "⊕": Shift/reduce conflict on token "⊕":
Example exp "⊕" exp • "⊕" exp Example exp "⊕" exp • "⊕" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
Shift/reduce conflict on token "+": Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp Example exp "⊕" exp • "+" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift/reduce conflict on token "+": Shift/reduce conflict on token "+":
Example exp "⊕" exp • "+" exp Example exp "⊕" exp • "+" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
input.y:6.3-13: warning: rule useless in parser due to conflicts [-Wother] input.y:6.3-13: warning: rule useless in parser due to conflicts [-Wother]
]]) ]])
@@ -1714,8 +1714,8 @@ State 7
2 exp: exp "+" exp • 2 exp: exp "+" exp •
1 exp: exp • "⊕" exp 1 exp: exp • "⊕" exp
Example exp "+" exp • "⊕" exp Example exp "+" exp • "⊕" exp
First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ] Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
Reduce/reduce conflict on tokens $end, "+", "⊕": Reduce/reduce conflict on tokens $end, "+", "⊕":
2 exp: exp "+" exp • 2 exp: exp "+" exp •
@@ -1728,8 +1728,8 @@ State 7
3 exp: exp "+" exp • 3 exp: exp "+" exp •
1 exp: exp • "⊕" exp 1 exp: exp • "⊕" exp
Example exp "+" exp • "⊕" exp Example exp "+" exp • "⊕" exp
First derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ] Shift derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "+" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "+" exp • ] "⊕" exp ]
@@ -1751,22 +1751,22 @@ State 8
1 exp: exp "⊕" exp • 1 exp: exp "⊕" exp •
1 exp: exp • "⊕" exp 1 exp: exp • "⊕" exp
Example exp "⊕" exp • "⊕" exp Example exp "⊕" exp • "⊕" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "⊕" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "⊕" exp ]
Shift/reduce conflict on token "+": Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp • 1 exp: exp "⊕" exp •
2 exp: exp • "+" exp 2 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp Example exp "⊕" exp • "+" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
Shift/reduce conflict on token "+": Shift/reduce conflict on token "+":
1 exp: exp "⊕" exp • 1 exp: exp "⊕" exp •
3 exp: exp • "+" exp 3 exp: exp • "+" exp
Example exp "⊕" exp • "+" exp Example exp "⊕" exp • "+" exp
First derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ] Shift derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ]
Second derivation exp → [ exp "⊕" exp → [ exp • "+" exp ] ] Reduce derivation exp → [ exp → [ exp "⊕" exp • ] "+" exp ]
]]) ]])