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cex: display the rule numbers
From
Example: "if" expr "then" "if" expr "then" stmt • "else" stmt
Shift derivation
if_stmt
↳ "if" expr "then" stmt
↳ if_stmt
↳ "if" expr "then" stmt • "else" stmt
Reduce derivation
if_stmt
↳ "if" expr "then" stmt "else" stmt
↳ if_stmt
↳ "if" expr "then" stmt •
to
Example: "if" expr "then" "if" expr "then" stmt • "else" stmt
Shift derivation
if_stmt
↳ 3: "if" expr "then" stmt
↳ 2: if_stmt
↳ 4: "if" expr "then" stmt • "else" stmt
Example: "if" expr "then" "if" expr "then" stmt • "else" stmt
Reduce derivation
if_stmt
↳ 4: "if" expr "then" stmt "else" stmt
↳ 2: if_stmt
↳ 3: "if" expr "then" stmt •
* src/state-item.h, src/state-item.c (state_item_rule): New.
* src/derivation.h, src/derivation.c (struct derivation): Add a rule
member.
Adjust dependencies.
* src/counterexample.c, src/parse-simulation.c: Pass the rule to
derivation_new.
* src/derivation.c (fprintf_if): New.
(derivation_width, derivation_print_tree_impl): Take the rule number
into account.
* tests/conflicts.at, tests/counterexample.at, tests/diagnostics.at,
* tests/report.at: Adjust.
* doc/bison.texi: Adjust.
This commit is contained in:
Akim Demaille
128
doc/bison.texi
128
doc/bison.texi
@@ -8329,29 +8329,29 @@ with two different parses:
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Example: @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt}
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Shift derivation
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@yellow{if_stmt}
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@yellow{↳ "if" expr "then"} @green{stmt}
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@green{↳} @blue{if_stmt}
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@blue{↳ "if" expr "then" stmt} @red{•} @blue{"else" stmt}
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@yellow{↳ 3: "if" expr "then"} @green{stmt}
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@green{↳ 2:} @blue{if_stmt}
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@blue{↳ 4: "if" expr "then" stmt} @red{•} @blue{"else" stmt}
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Example: @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
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Reduce derivation
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@yellow{if_stmt}
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@yellow{↳ "if" expr "then"} @green{stmt} @yellow{"else" stmt}
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@green{↳} @blue{if_stmt}
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@blue{↳ "if" expr "then" stmt} @red{•}
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@yellow{↳ 4: "if" expr "then"} @green{stmt} @yellow{"else" stmt}
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@green{↳ 2:} @blue{if_stmt}
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@blue{↳ 3: "if" expr "then" stmt} @red{•}
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@end ifnottex
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@iftex
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Example: @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @blue{"else" stmt}
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Shift derivation
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@yellow{if_stmt}
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@yellow{@arrow{} "if" expr "then"} @green{stmt}
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@green{@arrow{}} @blue{if_stmt}
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@blue{@arrow{} "if" expr "then" stmt} @red{•} @blue{"else" stmt}
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@yellow{@arrow{} 3: "if" expr "then"} @green{stmt}
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@green{@arrow{} 2:} @blue{if_stmt}
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@blue{@arrow{} 4: "if" expr "then" stmt} @red{•} @blue{"else" stmt}
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Example: @yellow{"if" expr "then"} @blue{"if" expr "then" stmt} @red{•} @yellow{"else" stmt}
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Reduce derivation
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@yellow{if_stmt}
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@yellow{@arrow{} "if" expr "then"} @green{stmt} @yellow{"else" stmt}
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@green{@arrow{}} @blue{if_stmt}
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@blue{@arrow{} "if" expr "then" stmt} @red{•}
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@yellow{@arrow{} 4: "if" expr "then"} @green{stmt} @yellow{"else" stmt}
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@green{@arrow{} 2:} @blue{if_stmt}
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@blue{@arrow{} 3: "if" expr "then" stmt} @red{•}
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@end iftex
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@end group
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@end macro
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@@ -9957,11 +9957,11 @@ initially developed by Chinawat Isradisaikul and Andrew Myers
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As a first example, see the grammar of @ref{Shift/Reduce}, which features
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one shift/reduce conflict:
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@c see doc/if-then-else.y
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@c see doc/else.y
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@example
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$ @kbd{bison if-then-else.y}
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if-then-else.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}]
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if-then-else.y: @dnotice{note}: rerun with option '-Wcounterexamples' to generate conflict counterexamples
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$ @kbd{bison else.y}
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else.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}]
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else.y: @dnotice{note}: rerun with option '-Wcounterexamples' to generate conflict counterexamples
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@end example
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@noindent
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@@ -9970,8 +9970,8 @@ Let's rerun @command{bison} with the option
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output is actually in color)}:
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@example
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if-then-else.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}]
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if-then-else.y: @dwarning{warning}: shift/reduce conflict on token "else" [@dwarning{-Wcounterexamples}]
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else.y: @dwarning{warning}: 1 shift/reduce conflict [@dwarning{-Wconflicts-sr}]
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else.y: @dwarning{warning}: shift/reduce conflict on token "else" [@dwarning{-Wcounterexamples}]
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@danglingElseCex
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@end example
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@@ -10011,39 +10011,39 @@ sequence.y: @dwarning{warning}: shift/reduce conflict on token "word" [@dwarning
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Example: @red{•} @green{"word"}
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Shift derivation
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@yellow{sequence}
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@yellow{↳} @green{maybeword}
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@green{↳} @red{•} @green{"word"}
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@yellow{↳ 2:} @green{maybeword}
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@green{↳ 5:} @red{•} @green{"word"}
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Example: @red{•} @yellow{"word"}
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Reduce derivation
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@yellow{sequence}
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@yellow{↳} @green{sequence} @yellow{"word"}
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@green{↳} @red{•}
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@yellow{↳ 3:} @green{sequence} @yellow{"word"}
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@green{↳ 1:} @red{•}
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@end group
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@group
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sequence.y: @dwarning{warning}: reduce/reduce conflict on tokens $end, "word" [@dwarning{-Wcounterexamples}]
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Example: @red{•}
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First reduce derivation
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@yellow{sequence}
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@yellow{↳} @red{•}
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@yellow{↳ 1:} @red{•}
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Example: @red{•}
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Second reduce derivation
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@yellow{sequence}
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@yellow{↳} @green{maybeword}
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@green{↳} @red{•}
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@yellow{↳ 2:} @green{maybeword}
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@green{↳ 4:} @red{•}
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@end group
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@group
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sequence.y: @dwarning{warning}: shift/reduce conflict on token "word" [@dwarning{-Wcounterexamples}]
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Example: @red{•} @green{"word"}
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Shift derivation
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@yellow{sequence}
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@yellow{↳} @green{maybeword}
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@green{↳} @red{•} @green{"word"}
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@yellow{↳ 2:} @green{maybeword}
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@green{↳ 5:} @red{•} @green{"word"}
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Example: @red{•} @yellow{"word"}
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Reduce derivation
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@yellow{sequence}
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@yellow{↳} @green{sequence} @yellow{"word"}
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@green{↳} @blue{maybeword}
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@blue{↳} @red{•}
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@yellow{↳ 3:} @green{sequence} @yellow{"word"}
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@green{↳ 2:} @blue{maybeword}
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@blue{↳ 4:} @red{•}
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@end group
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@group
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sequence.y:8.3-45: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}]
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@@ -10057,39 +10057,39 @@ sequence.y: @dwarning{warning}: shift/reduce conflict on token "word" [@dwarning
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Example: @red{•} @green{"word"}
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Shift derivation
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@yellow{sequence}
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@yellow{@arrow{}} @green{maybeword}
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@green{@arrow{}} @red{•} @green{"word"}
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@yellow{@arrow{} 2:} @green{maybeword}
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@green{@arrow{} 5:} @red{•} @green{"word"}
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Example: @red{•} @yellow{"word"}
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Reduce derivation
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@yellow{sequence}
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@yellow{@arrow{}} @green{sequence} @yellow{"word"}
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@green{@arrow{}} @red{•}
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@yellow{@arrow{} 3:} @green{sequence} @yellow{"word"}
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@green{@arrow{} 1:} @red{•}
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@end group
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@group
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sequence.y: @dwarning{warning}: reduce/reduce conflict on tokens $end, "word" [@dwarning{-Wcounterexamples}]
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Example: @red{•}
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First reduce derivation
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@yellow{sequence}
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@yellow{@arrow{}} @red{•}
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@yellow{@arrow{} 1:} @red{•}
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Example: @red{•}
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Second reduce derivation
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@yellow{sequence}
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@yellow{@arrow{}} @green{maybeword}
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@green{@arrow{}} @red{•}
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@yellow{@arrow{} 2:} @green{maybeword}
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@green{@arrow{}: 4} @red{•}
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@end group
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@group
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sequence.y: @dwarning{warning}: shift/reduce conflict on token "word" [@dwarning{-Wcounterexamples}]
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Example: @red{•} @green{"word"}
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Shift derivation
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@yellow{sequence}
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@yellow{@arrow{}} @green{maybeword}
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@green{@arrow{}} @red{•} @green{"word"}
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@yellow{@arrow{} 2:} @green{maybeword}
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@green{@arrow{} 5:} @red{•} @green{"word"}
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Example: @red{•} @yellow{"word"}
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Reduce derivation
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@yellow{sequence}
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@yellow{@arrow{}} @green{sequence} @yellow{"word"}
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@green{@arrow{}} @blue{maybeword}
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@blue{@arrow{}} @red{•}
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@yellow{@arrow{} 3:} @green{sequence} @yellow{"word"}
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@green{@arrow{} 2:} @blue{maybeword}
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@blue{@arrow{} 4:} @red{•}
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@end group
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@group
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sequence.y:8.3-45: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}]
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@@ -10130,16 +10130,16 @@ ids.y: @dwarning{warning}: shift/reduce conflict on token ID [@dwarning{-Wcounte
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First example: @purple{expr} @red{•} @purple{ID ','} @green{ID} @yellow{$end}
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Shift derivation
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@yellow{$accept}
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@yellow{↳} @green{s} @yellow{$end}
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@green{↳} @blue{a} @green{ID}
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@blue{↳} @purple{expr}
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@purple{↳ expr} @red{•} @purple{ID ','}
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@yellow{↳ 0:} @green{s} @yellow{$end}
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@green{↳ 1:} @blue{a} @green{ID}
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@blue{↳ 2:} @purple{expr}
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@purple{↳ 4: expr} @red{•} @purple{ID ','}
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Second example: @blue{expr} @red{•} @green{ID} @yellow{$end}
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Reduce derivation
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@yellow{$accept}
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@yellow{↳} @green{s} @yellow{$end}
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@green{↳} @blue{a} @green{ID}
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@blue{↳ expr} @red{•}
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@yellow{↳ 0:} @green{s} @yellow{$end}
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@green{↳ 1:} @blue{a} @green{ID}
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@blue{↳ 2: expr} @red{•}
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@end group
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@group
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ids.y:4.4-7: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}]
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@@ -10152,16 +10152,16 @@ ids.y:4.4-7: @dwarning{warning}: rule useless in parser due to conflicts [@dwarn
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First example: @purple{expr} @red{•} @purple{ID ','} @green{ID} @yellow{$end}
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Shift derivation
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@yellow{$accept}
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@yellow{@arrow{}} @green{s} @yellow{$end}
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@green{@arrow{}} @blue{a} @green{ID}
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@blue{@arrow{}} @purple{expr}
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@purple{@arrow{} expr} @red{•} @purple{ID ','}
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@yellow{@arrow{} 0:} @green{s} @yellow{$end}
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@green{@arrow{} 1:} @blue{a} @green{ID}
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@blue{@arrow{} 2:} @purple{expr}
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@purple{@arrow{} 4: expr} @red{•} @purple{ID ','}
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Second example: @blue{expr} @red{•} @green{ID} @yellow{$end}
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Reduce derivation
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@yellow{$accept}
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@yellow{@arrow{}} @green{s} @yellow{$end}
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@green{@arrow{}} @blue{a} @green{ID}
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@blue{@arrow{} expr} @red{•}
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@yellow{@arrow{} 0:} @green{s} @yellow{$end}
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@green{@arrow{} 1:} @blue{a} @green{ID}
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@blue{@arrow{} 2: expr} @red{•}
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@end group
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@group
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ids.y:4.4-7: @dwarning{warning}: rule useless in parser due to conflicts [@dwarning{-Wother}]
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@@ -10570,13 +10570,13 @@ shift/reduce conflict on token '/':
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Example: exp '+' exp • '/' exp
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Shift derivation
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exp
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↳ exp '+' exp
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↳ exp • '/' exp
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↳ 1: exp '+' exp
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↳ 4: exp • '/' exp
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Example: exp '+' exp • '/' exp
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Reduce derivation
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exp
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↳ exp '/' exp
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↳ exp '+' exp •
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↳ 4: exp '/' exp
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↳ 1: exp '+' exp •
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@end group
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@end example
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@end ifnottex
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@@ -10589,13 +10589,13 @@ shift/reduce conflict on token '/':
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Example: exp '+' exp • '/' exp
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Shift derivation
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exp
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@arrow{} exp '+' exp
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@arrow{} exp • '/' exp
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@arrow{} 1: exp '+' exp
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@arrow{} 4: exp • '/' exp
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Example: exp '+' exp • '/' exp
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Reduce derivation
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exp
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@arrow{} exp '/' exp
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@arrow{} exp '+' exp •
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@arrow{} 4: exp '/' exp
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@arrow{} 1: exp '+' exp •
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@end group
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@end example
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@end iftex
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