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b408954b40
* src/LR0.c (new_state): Set it to 0. * src/conflicts.h, src/conflicts.c (print_conflicts) (free_conflicts, solve_conflicts): Rename as... (conflicts_print, conflicts_free, conflicts_solve): these. Adjust callers. * src/conflicts.c (enum conflict_resolution_e) (solved_conflicts_obstack): New, used by... (log_resolution): this. Adjust to attach the conflict resolution to each state. Complete the description with the precedence/associativity information. (resolve_sr_conflict): Adjust. * src/print.c (print_state): Output its solved_conflicts. * tests/conflicts.at (Unresolved SR Conflicts) (Solved SR Conflicts): Exercise --report=all.
402 lines
6.7 KiB
Plaintext
402 lines
6.7 KiB
Plaintext
# Exercising Bison on conflicts. -*- Autotest -*-
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# Copyright (C) 2002 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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# 02111-1307, USA.
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AT_BANNER([[Conflicts.]])
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## ---------------- ##
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## S/R in initial. ##
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## ---------------- ##
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# I once hacked Bison in such a way that it lost its reductions on the
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# initial state (because it was confusing it with the last state). It
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# took me a while to strip down my failures to this simple case. So
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# make sure it finds the s/r conflict below.
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AT_SETUP([S/R in initial])
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AT_DATA([[input.y]],
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[[%expect 1
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%%
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exp: e 'e';
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e: 'e' | /* Nothing. */;
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]])
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AT_CHECK([bison input.y -o input.c])
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AT_CLEANUP
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## ------------------- ##
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## %nonassoc and eof. ##
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## ------------------- ##
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AT_SETUP([%nonassoc and eof])
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AT_DATA([input.y],
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[[
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%{
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#include <config.h>
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/* We don't need a perfect malloc for these tests. */
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#undef malloc
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#include <stdio.h>
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#if STDC_HEADERS
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# include <stdlib.h>
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#endif
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#define YYERROR_VERBOSE 1
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static void
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yyerror (const char *msg)
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{
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fprintf (stderr, "%s\n", msg);
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exit (1);
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}
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/* The current argument. */
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static const char *input = NULL;
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static int
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yylex (void)
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{
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/* No token stands for end of file. */
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if (input && *input)
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return *input++;
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else
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return 0;
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}
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%}
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%nonassoc '<' '>'
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%%
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expr: expr '<' expr
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| expr '>' expr
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| '0'
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;
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%%
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int
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main (int argc, const char *argv[])
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{
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if (argc > 1)
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input = argv[1];
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return yyparse ();
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}
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]])
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# Specify the output files to avoid problems on different file systems.
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AT_CHECK([bison input.y -o input.c])
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AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore])
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AT_CHECK([./input '0<0'])
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# FIXME: This is an actual bug, but a new one, in the sense that
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# no one has ever spotted it! The messages are *wrong*: there should
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# be nothing there, it should be expected eof.
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AT_CHECK([./input '0<0<0'], [1], [],
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[parse error, unexpected '<', expecting '<' or '>'
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])
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AT_CHECK([./input '0>0'])
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AT_CHECK([./input '0>0>0'], [1], [],
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[parse error, unexpected '>', expecting '<' or '>'
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])
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AT_CHECK([./input '0<0>0'], [1], [],
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[parse error, unexpected '>', expecting '<' or '>'
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])
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AT_CLEANUP
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## ------------------------- ##
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## Unresolved SR Conflicts. ##
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## ------------------------- ##
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AT_SETUP([Unresolved SR Conflicts])
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AT_DATA([input.y],
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[[%token NUM OP
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%%
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exp: exp OP exp | NUM;
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]])
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AT_CHECK([bison input.y -o input.c --report=all], 0, [],
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[input.y contains 1 shift/reduce conflict.
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])
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# Check the contents of the report.
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AT_CHECK([cat input.output], [],
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[[State 5 contains 1 shift/reduce conflict.
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Grammar
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Number, Line, Rule
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0 3 $axiom -> exp $
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1 3 exp -> exp OP exp
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2 3 exp -> NUM
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Terminals, with rules where they appear
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$ (0) 0
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error (256)
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NUM (258) 2
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OP (259) 1
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Nonterminals, with rules where they appear
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$axiom (5)
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on left: 0
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exp (6)
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on left: 1 2, on right: 0 1
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state 0
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$axiom -> . exp $ (rule 0)
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exp -> . exp OP exp (rule 1)
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exp -> . NUM (rule 2)
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NUM shift, and go to state 1
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exp go to state 2
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state 1
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exp -> NUM . (rule 2)
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$default reduce using rule 2 (exp)
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state 2
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$axiom -> exp . $ (rule 0)
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exp -> exp . OP exp (rule 1)
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$ shift, and go to state 3
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OP shift, and go to state 4
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state 3
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$axiom -> exp $ . (rule 0)
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$default accept
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state 4
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exp -> . exp OP exp (rule 1)
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exp -> exp OP . exp (rule 1)
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exp -> . NUM (rule 2)
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NUM shift, and go to state 1
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exp go to state 5
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state 5
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exp -> exp . OP exp [$, OP] (rule 1)
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exp -> exp OP exp . [$, OP] (rule 1)
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OP shift, and go to state 4
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OP [reduce using rule 1 (exp)]
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$default reduce using rule 1 (exp)
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]])
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AT_CLEANUP
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## --------------------- ##
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## Solved SR Conflicts. ##
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## --------------------- ##
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AT_SETUP([Solved SR Conflicts])
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AT_DATA([input.y],
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[[%token NUM OP
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%right OP
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%%
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exp: exp OP exp | NUM;
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]])
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AT_CHECK([bison input.y -o input.c --report=all], 0, [], [])
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# Check the contents of the report.
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AT_CHECK([cat input.output], [],
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[[Grammar
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Number, Line, Rule
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0 4 $axiom -> exp $
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1 4 exp -> exp OP exp
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2 4 exp -> NUM
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Terminals, with rules where they appear
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$ (0) 0
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error (256)
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NUM (258) 2
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OP (259) 1
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Nonterminals, with rules where they appear
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$axiom (5)
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on left: 0
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exp (6)
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on left: 1 2, on right: 0 1
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state 0
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$axiom -> . exp $ (rule 0)
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exp -> . exp OP exp (rule 1)
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exp -> . NUM (rule 2)
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NUM shift, and go to state 1
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exp go to state 2
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state 1
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exp -> NUM . (rule 2)
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$default reduce using rule 2 (exp)
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state 2
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$axiom -> exp . $ (rule 0)
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exp -> exp . OP exp (rule 1)
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$ shift, and go to state 3
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OP shift, and go to state 4
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state 3
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$axiom -> exp $ . (rule 0)
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$default accept
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state 4
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exp -> . exp OP exp (rule 1)
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exp -> exp OP . exp (rule 1)
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exp -> . NUM (rule 2)
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NUM shift, and go to state 1
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exp go to state 5
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state 5
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exp -> exp . OP exp [$] (rule 1)
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exp -> exp OP exp . [$] (rule 1)
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OP shift, and go to state 4
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$default reduce using rule 1 (exp)
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Conflict between rule 2 and token OP resolved as reduce (%right OP).
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]])
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AT_CLEANUP
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## -------------------- ##
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## %expect not enough. ##
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## -------------------- ##
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AT_SETUP([%expect not enough])
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AT_DATA([input.y],
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[[%token NUM OP
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%expect 0
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%%
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exp: exp OP exp | NUM;
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]])
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AT_CHECK([bison input.y -o input.c], 1, [],
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[input.y contains 1 shift/reduce conflict.
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expected 0 shift/reduce conflicts
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])
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AT_CLEANUP
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## --------------- ##
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## %expect right. ##
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## --------------- ##
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AT_SETUP([%expect right])
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AT_DATA([input.y],
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[[%token NUM OP
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%expect 1
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%%
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exp: exp OP exp | NUM;
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]])
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AT_CHECK([bison input.y -o input.c], 0)
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AT_CLEANUP
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## ------------------ ##
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## %expect too much. ##
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## ------------------ ##
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AT_SETUP([%expect too much])
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AT_DATA([input.y],
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[[%token NUM OP
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%expect 2
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%%
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exp: exp OP exp | NUM;
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]])
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AT_CHECK([bison input.y -o input.c], 1, [],
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[input.y contains 1 shift/reduce conflict.
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expected 2 shift/reduce conflicts
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])
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AT_CLEANUP
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