X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/67fd79c42743952d58ca53e3a97a8b66ee31bcc6..b541ffdf2ce8269bf616d0e078051a0b2650238e:/tests/conflicts.at diff --git a/tests/conflicts.at b/tests/conflicts.at index 9b503b63..21ba86d7 100644 --- a/tests/conflicts.at +++ b/tests/conflicts.at @@ -1,6 +1,6 @@ # Exercising Bison on conflicts. -*- Autotest -*- -# Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc. +# Copyright (C) 2002, 2003, 2004, 2005, 2007 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 @@ -56,6 +56,7 @@ AT_DATA_GRAMMAR([input.y], %{ #include #include +#include #define YYERROR_VERBOSE 1 static void @@ -65,16 +66,15 @@ yyerror (const char *msg) } /* The current argument. */ -static const char *input = NULL; +static const char *input; static int yylex (void) { - /* No token stands for end of file. */ - if (input && *input) - return *input++; - else - return 0; + static size_t toknum; + if (! (toknum <= strlen (input))) + abort (); + return input[toknum++]; } %} @@ -90,8 +90,7 @@ expr: expr '<' expr int main (int argc, const char *argv[]) { - if (argc > 1) - input = argv[1]; + input = argc <= 1 ? "" : argv[1]; return yyparse (); } ]]) @@ -482,9 +481,9 @@ AT_DATA([input.y], exp: exp OP exp | NUM; ]]) -AT_CHECK([bison -o input.c input.y], 0, [], +AT_CHECK([bison -o input.c input.y], 1, [], [input.y: conflicts: 1 shift/reduce -input.y: warning: expected 0 shift/reduce conflicts +input.y: expected 0 shift/reduce conflicts ]) AT_CLEANUP @@ -519,9 +518,9 @@ AT_DATA([input.y], exp: exp OP exp | NUM; ]]) -AT_CHECK([bison -o input.c input.y], 0, [], +AT_CHECK([bison -o input.c input.y], 1, [], [input.y: conflicts: 1 shift/reduce -input.y: warning: expected 2 shift/reduce conflicts +input.y: expected 2 shift/reduce conflicts ]) AT_CLEANUP @@ -539,9 +538,9 @@ program: a 'a' | a a; a: 'a'; ]]) -AT_CHECK([bison -o input.c input.y], 0, [], +AT_CHECK([bison -o input.c input.y], 1, [], [input.y: conflicts: 1 reduce/reduce -input.y: warning: expected 0 reduce/reduce conflicts +input.y: expected 0 reduce/reduce conflicts ]) AT_CLEANUP @@ -618,3 +617,201 @@ e: e '+' e AT_CHECK([bison -o input.c input.y]) AT_CLEANUP + + +## ---------------------------------------------- ## +## Unreachable States After Conflict Resolution. ## +## ---------------------------------------------- ## + +AT_SETUP([[Unreachable States After Conflict Resolution]]) + +# If conflict resolution makes states unreachable, remove those states, report +# rules that are then unused, and don't report conflicts in those states. Test +# what happens when a nonterminal becomes useless as a result of state removal +# since that causes lalr.o's goto map to be rewritten. + +AT_DATA([[input.y]], +[[%output "input.c" +%left 'a' + +%% + +start: resolved_conflict 'a' reported_conflicts 'a' ; + +/* S/R conflict resolved as shift, so the state with item + * (resolved_conflict: 'a' . unreachable1) and all it transition successors are + * unreachable, and the associated production is useless. */ +resolved_conflict: + 'a' unreachable1 + | %prec 'a' + ; + +/* S/R conflict that need not be reported since it is unreachable because of + * the previous conflict resolution. Nonterminal unreachable1 and all its + * productions are useless. */ +unreachable1: + 'a' unreachable2 + | + ; + +/* Likewise for a R/R conflict and nonterminal unreachable2. */ +unreachable2: | ; + +/* Make sure remaining S/R and R/R conflicts are still reported correctly even + * when their states are renumbered due to state removal. */ +reported_conflicts: + 'a' + | 'a' + | + ; + +]]) + +AT_CHECK([[bison --report=all input.y]], 0, [], +[[input.y: conflicts: 1 shift/reduce, 1 reduce/reduce +input.y:12.5-20: warning: rule never reduced because of conflicts: resolved_conflict: 'a' unreachable1 +input.y:20.5-20: warning: rule never reduced because of conflicts: unreachable1: 'a' unreachable2 +input.y:21.4: warning: rule never reduced because of conflicts: unreachable1: /* empty */ +input.y:25.13: warning: rule never reduced because of conflicts: unreachable2: /* empty */ +input.y:25.16: warning: rule never reduced because of conflicts: unreachable2: /* empty */ +input.y:31.5-7: warning: rule never reduced because of conflicts: reported_conflicts: 'a' +input.y:32.4: warning: rule never reduced because of conflicts: reported_conflicts: /* empty */ +]]) + +AT_CHECK([[cat input.output]], 0, +[[Rules never reduced + + 2 resolved_conflict: 'a' unreachable1 + + 4 unreachable1: 'a' unreachable2 + 5 | /* empty */ + + 6 unreachable2: /* empty */ + 7 | /* empty */ + + 9 reported_conflicts: 'a' + 10 | /* empty */ + + +State 4 conflicts: 1 shift/reduce +State 5 conflicts: 1 reduce/reduce + + +Grammar + + 0 $accept: start $end + + 1 start: resolved_conflict 'a' reported_conflicts 'a' + + 2 resolved_conflict: 'a' unreachable1 + 3 | /* empty */ + + 4 unreachable1: 'a' unreachable2 + 5 | /* empty */ + + 6 unreachable2: /* empty */ + 7 | /* empty */ + + 8 reported_conflicts: 'a' + 9 | 'a' + 10 | /* empty */ + + +Terminals, with rules where they appear + +$end (0) 0 +'a' (97) 1 2 4 8 9 +error (256) + + +Nonterminals, with rules where they appear + +$accept (4) + on left: 0 +start (5) + on left: 1, on right: 0 +resolved_conflict (6) + on left: 2 3, on right: 1 +unreachable1 (7) + on left: 4 5, on right: 2 +unreachable2 (8) + on left: 6 7, on right: 4 +reported_conflicts (9) + on left: 8 9 10, on right: 1 + + +state 0 + + 0 $accept: . start $end + 1 start: . resolved_conflict 'a' reported_conflicts 'a' + 2 resolved_conflict: . 'a' unreachable1 + 3 | . ['a'] + + $default reduce using rule 3 (resolved_conflict) + + start go to state 1 + resolved_conflict go to state 2 + + Conflict between rule 3 and token 'a' resolved as reduce (%left 'a'). + + +state 1 + + 0 $accept: start . $end + + $end shift, and go to state 3 + + +state 2 + + 1 start: resolved_conflict . 'a' reported_conflicts 'a' + + 'a' shift, and go to state 4 + + +state 3 + + 0 $accept: start $end . + + $default accept + + +state 4 + + 1 start: resolved_conflict 'a' . reported_conflicts 'a' + 8 reported_conflicts: . 'a' + 9 | . 'a' + 10 | . ['a'] + + 'a' shift, and go to state 5 + + 'a' [reduce using rule 10 (reported_conflicts)] + + reported_conflicts go to state 6 + + +state 5 + + 8 reported_conflicts: 'a' . ['a'] + 9 | 'a' . ['a'] + + 'a' reduce using rule 8 (reported_conflicts) + 'a' [reduce using rule 9 (reported_conflicts)] + $default reduce using rule 8 (reported_conflicts) + + +state 6 + + 1 start: resolved_conflict 'a' reported_conflicts . 'a' + + 'a' shift, and go to state 7 + + +state 7 + + 1 start: resolved_conflict 'a' reported_conflicts 'a' . + + $default reduce using rule 1 (start) +]]) + +AT_CLEANUP