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cex: display the rule numbers

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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
2020-07-28 19:50:22 +02:00
parent 2becdace96
commit 3c36d871fa
13 changed files with 407 additions and 357 deletions
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21
NEWS
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@@ -2,12 +2,10 @@ GNU Bison NEWS
* Noteworthy changes in release ?.? (????-??-??) [?]
** Bug fixes
Push parsers use YYMALLOC/YYFREE instead of direct calls to malloc/free.
** Changes
*** A C++ native GLR parser
A new version of the generated C++ GLR parser was added as "glr2.cc". It
is forked from the existing glr.c/cc parser, with the objective of making
it a more modern, truly C++ parser (instead of a C++ wrapper around a C
@@ -19,6 +17,21 @@ GNU Bison NEWS
%skeleton "glr2.cc"
*** Counterexamples
Counterexamples now show the rule numbers:
exp
↳ 1: "if" exp "then" exp
↳ 2: "if" exp "then" exp • "else" exp
instead of
exp
↳ "if" exp "then" exp
↳ "if" exp "then" exp • "else" exp
* Noteworthy changes in release 3.7.1 (2020-08-02) [stable]
** Bug fixes