X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/b7691f15bdefaabbc246ea9b1855189a8d1cc318..4c9b8f1318c68238074ee19e7ab976a22924540e:/tests/glr-regression.at diff --git a/tests/glr-regression.at b/tests/glr-regression.at index 3e6d0351..9eb429c7 100644 --- a/tests/glr-regression.at +++ b/tests/glr-regression.at @@ -1,40 +1,43 @@ # Checking GLR Parsing: Regression Tests -*- Autotest -*- -# Copyright (C) 2002, 2003, 2005, 2006 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 -# the Free Software Foundation; either version 2, or (at your option) -# any later version. +# Copyright (C) 2002-2003, 2005-2007, 2009-2013 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 +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. - +# # You should have received a copy of the GNU General Public License -# along with this program; if not, write to the Free Software -# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -# 02110-1301, USA. +# along with this program. If not, see . AT_BANNER([[GLR Regression Tests]]) -## --------------------------- ## -## Badly Collapsed GLR States. ## -## --------------------------- ## +## ---------------------------- ## +## Badly Collapsed GLR States. ## +## ---------------------------- ## AT_SETUP([Badly Collapsed GLR States]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr1.y], [[/* Regression Test: Improper state compression */ /* Reported by Scott McPeak */ %{ #include +#include +#include #define YYSTYPE int static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1); -int yylex (void); -void yyerror (char const *msg); +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ %} @@ -64,38 +67,31 @@ static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1) return 0; } +const char *input = YY_NULL; + int -main (void) +main (int argc, const char* argv[]) { + assert (argc == 2); + input = argv[1]; return yyparse (); } -void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - +]AT_YYERROR_DEFINE[ int yylex (void) { - for (;;) - { - int ch = getchar (); - if (ch == EOF) - return 0; - else if (ch == 'B' || ch == 'P') - return ch; - } + return *input++; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr1.c glr-regr1.y]], 0, [], -[glr-regr1.y: conflicts: 1 shift/reduce -]) +AT_BISON_CHECK([[-o glr-regr1.c glr-regr1.y]], 0, [], +[[glr-regr1.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +]]) AT_COMPILE([glr-regr1]) -AT_CHECK([[echo BPBPB | ./glr-regr1]], 0, +AT_PARSER_CHECK([[./glr-regr1 BPBPB]], 0, [[E -> 'B' E -> 'B' E -> E 'P' E @@ -109,12 +105,13 @@ E -> E 'P' E AT_CLEANUP -## ------------------------------------------------------------ ## -## Improper handling of embedded actions and $-N in GLR parsers ## -## ------------------------------------------------------------ ## +## -------------------------------------------------------------- ## +## Improper handling of embedded actions and $-N in GLR parsers. ## +## -------------------------------------------------------------- ## AT_SETUP([Improper handling of embedded actions and dollar(-N) in GLR parsers]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr2a.y], [[/* Regression Test: Improper handling of embedded actions and $-N */ /* Reported by S. Eken */ @@ -126,8 +123,9 @@ AT_DATA_GRAMMAR([glr-regr2a.y], #include #include #include - int yylex (void); - void yyerror (char const *); + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ %} %glr-parser @@ -167,15 +165,17 @@ var_printer: 'v' { printf ("Variable: '%s'\n", $-1); } %% - -FILE *input = NULL; +]AT_YYERROR_DEFINE[ +FILE *input; int yylex (void) { char buf[50]; char *s; - switch (fscanf (input, " %1[a-z,]", buf)) { + assert (!feof (stdin)); + switch (fscanf (input, " %1[a-z,]", buf)) + { case 1: return buf[0]; case EOF: @@ -185,63 +185,78 @@ yylex (void) } if (fscanf (input, "%49s", buf) != 1) return 0; - if (sizeof buf - 1 <= strlen (buf)) - abort (); + assert (strlen (buf) < sizeof buf - 1); s = (char *) malloc (strlen (buf) + 1); strcpy (s, buf); yylval = s; return 'V'; } -void -yyerror (char const *s) -{ printf ("%s\n", s); -} - int main (int argc, char **argv) { + int res; input = stdin; - if (argc == 2 && !(input = fopen (argv[1], "r"))) return 3; - return yyparse (); + if (argc == 2 && !(input = fopen (argv[1], "r"))) + return 3; + res = yyparse (); + if (argc == 2 && fclose (input)) + return 4; + return res; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr2a.c glr-regr2a.y]], 0, [], -[glr-regr2a.y: conflicts: 2 shift/reduce -]) +AT_BISON_CHECK([[-o glr-regr2a.c glr-regr2a.y]], 0, [], +[[glr-regr2a.y: warning: 2 shift/reduce conflicts [-Wconflicts-sr] +]]) AT_COMPILE([glr-regr2a]) -AT_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0, +AT_DATA([input1.txt], +[[s VARIABLE_1 t v x q +]]) +AT_PARSER_CHECK([[./glr-regr2a input1.txt]], 0, [[Variable: 'VARIABLE_1' -]], []) -AT_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]], 0, +]]) + +AT_DATA([input2.txt], +[[s VARIABLE_1 , ANOTHER_VARIABLE_2 t e +]]) +AT_PARSER_CHECK([[./glr-regr2a input2.txt]], +0, [[Varlist: 'VARIABLE_1,ANOTHER_VARIABLE_2' ]]) -AT_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0, + +AT_DATA([input3.txt], +[[s VARIABLE_3 t v x +]]) +AT_PARSER_CHECK([[./glr-regr2a input3.txt]], 0, [[Variable: 'VARIABLE_3' -]], []) +]]) AT_CLEANUP -## ------------------------------------------------------------ ## -## Improper merging of GLR delayed action sets ## -## ------------------------------------------------------------ ## +## --------------------------------------------- ## +## Improper merging of GLR delayed action sets. ## +## --------------------------------------------- ## AT_SETUP([Improper merging of GLR delayed action sets]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr3.y], [[/* Regression Test: Improper merging of GLR delayed action sets. */ /* Reported by M. Rosien */ %{ #include +#include #include +#include static int MergeRule (int x0, int x1); -static void yyerror(char const * s); -int yylex (void); +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ #define RULE(x) (1 << (x)) @@ -282,15 +297,14 @@ NT6 : P1 NT1 O1 T3 P2 { $$ = RULE(11) | $2; } %merge %% -static int MergeRule (int x0, int x1) { +static int +MergeRule (int x0, int x1) +{ return x0 | x1; } +]AT_YYERROR_DEFINE[ -static void yyerror(char const * s) { - fprintf(stderr,"error: %s\n",s); -} - -FILE *input = NULL; +FILE *input = YY_NULL; int P[] = { P1, P2 }; int O[] = { O1, O2 }; @@ -299,6 +313,7 @@ int T[] = { T1, T2, T3, T4 }; int yylex (void) { char inp[3]; + assert (!feof (stdin)); if (fscanf (input, "%2s", inp) == EOF) return 0; switch (inp[0]) @@ -310,32 +325,46 @@ int yylex (void) return BAD_CHAR; } -int main(int argc, char* argv[]) { +int +main (int argc, char* argv[]) +{ + int res; input = stdin; - if (argc == 2 && !(input = fopen (argv[1], "r"))) return 3; - return yyparse (); + if (argc == 2 && !(input = fopen (argv[1], "r"))) + return 3; + res = yyparse (); + if (argc == 2 && fclose (input)) + return 4; + return res; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr3.c glr-regr3.y]], 0, [], -[glr-regr3.y: conflicts: 1 shift/reduce, 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr3.c glr-regr3.y]], 0, [], +[[glr-regr3.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +glr-regr3.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr3]) -AT_CHECK([[echo p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 | ./glr-regr3]], 0, +AT_DATA([input.txt], +[[p1 t4 o2 p1 p1 t1 o1 t2 p2 o1 t3 p2 p2 +]]) +AT_PARSER_CHECK([[./glr-regr3 input.txt]], +0, [[Result: 1c04 -]], []) +]]) AT_CLEANUP -## ------------------------------------------------------------------------- ## -## Duplicate representation of merged trees. See ## -## . ## -## ------------------------------------------------------------------------- ## +## ---------------------------------------------------------------------- ## +## Duplicate representation of merged trees. See ## +## . ## +## ---------------------------------------------------------------------- ## AT_SETUP([Duplicate representation of merged trees]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr4.y], [[ %union { char *ptr; } @@ -348,8 +377,10 @@ AT_DATA_GRAMMAR([glr-regr4.y], #include static char *merge (YYSTYPE, YYSTYPE); static char *make_value (char const *, char const *); - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static char *ptrs[100]; + static char **ptrs_next = ptrs; %} %% @@ -371,25 +402,23 @@ A2: 'a' { $$ = make_value ("A2", "'a'"); } ; B: 'a' { $$ = make_value ("B", "'a'"); } ; %% - -static int -yylex (void) -{ - static char const *input = "a"; - return *input++; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["a"])[ int main (void) { - return yyparse (); + int status = yyparse (); + while (ptrs_next != ptrs) + free (*--ptrs_next); + return status; } static char * make_value (char const *parent, char const *child) { char const format[] = "%s <- %s"; - char *value = + char *value = *ptrs_next++ = (char *) malloc (strlen (parent) + strlen (child) + sizeof format); sprintf (value, format, parent, child); return value; @@ -399,45 +428,41 @@ static char * merge (YYSTYPE s1, YYSTYPE s2) { char const format[] = "merge{ %s and %s }"; - char *value = + char *value = *ptrs_next++ = (char *) malloc (strlen (s1.ptr) + strlen (s2.ptr) + sizeof format); sprintf (value, format, s1.ptr, s2.ptr); return value; } - -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr4.c glr-regr4.y]], 0, [], -[glr-regr4.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr4.c glr-regr4.y]], 0, [], +[[glr-regr4.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr4]) -AT_CHECK([[./glr-regr4]], 0, +AT_PARSER_CHECK([[./glr-regr4]], 0, [[merge{ S <- merge{ A <- A1 <- 'a' and A <- A2 <- 'a' } and S <- B <- 'a' } ]], []) AT_CLEANUP -## -------------------------------------------------------------------------- ## -## User destructor for unresolved GLR semantic value. See ## -## . ## -## -------------------------------------------------------------------------- ## +## ------------------------------------------------------------------------- ## +## User destructor for unresolved GLR semantic value. See ## +## . ## +## ------------------------------------------------------------------------- ## AT_SETUP([User destructor for unresolved GLR semantic value]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr5.y], [[ %{ #include #include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ enum { MAGIC_VALUE = -1057808125 }; /* originally chosen at random */ %} @@ -461,53 +486,39 @@ start: ; %% - -static int -yylex (void) -{ - static char const *input = "a"; - return *input++; -} - -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -int -main (void) -{ - return yyparse () != 1; -} +]AT_YYLEX_DEFINE(["a"])[ +]AT_YYERROR_DEFINE[ +]AT_MAIN_DEFINE[ ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr5.c glr-regr5.y]], 0, [], -[glr-regr5.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr5.c glr-regr5.y]], 0, [], +[[glr-regr5.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr5]) -AT_CHECK([[./glr-regr5]], 0, [], +AT_PARSER_CHECK([[./glr-regr5]], 1, [], [syntax is ambiguous ]) AT_CLEANUP -## -------------------------------------------------------------------------- ## -## User destructor after an error during a split parse. See ## -## . ## -## -------------------------------------------------------------------------- ## +## ------------------------------------------------------------------------- ## +## User destructor after an error during a split parse. See ## +## . ## +## ------------------------------------------------------------------------- ## AT_SETUP([User destructor after an error during a split parse]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr6.y], [[ %{ #include #include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ %} %glr-parser @@ -523,33 +534,18 @@ AT_DATA_GRAMMAR([glr-regr6.y], start: 'a' | 'a' ; %% - -static int -yylex (void) -{ - static char const *input = "a"; - return *input++; -} - -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -int -main (void) -{ - return yyparse () != 1; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["a"])[ +]AT_MAIN_DEFINE[ ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr6.c glr-regr6.y]], 0, [], -[glr-regr6.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr6.c glr-regr6.y]], 0, [], +[[glr-regr6.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr6]) -AT_CHECK([[./glr-regr6]], 0, +AT_PARSER_CHECK([[./glr-regr6]], 1, [Destructor called. ], [syntax is ambiguous @@ -559,28 +555,34 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Duplicated user destructor for lookahead. See ## +## Duplicated user destructor for lookahead. See ## ## . ## ## ------------------------------------------------------------------------- ## AT_SETUP([Duplicated user destructor for lookahead]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr7.y], [[ %{ #include #include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ #define YYSTACKEXPANDABLE 0 + typedef struct count_node { + int count; + struct count_node *prev; + } count_node; + static count_node *tail; %} %glr-parser -%union { int *count; } -%type 'a' +%union { count_node *node; } +%type 'a' %destructor { - if ((*$$)++) + if ($$->count++) fprintf (stderr, "Destructor called on same value twice.\n"); } 'a' @@ -599,35 +601,40 @@ stack2: 'a' ; static int yylex (void) { - yylval.count = (int *) malloc (sizeof (int)); - if (!yylval.count) + yylval.node = (count_node*) malloc (sizeof *yylval.node); + if (!yylval.node) { fprintf (stderr, "Test inconclusive.\n"); exit (EXIT_FAILURE); } - *yylval.count = 0; + yylval.node->count = 0; + yylval.node->prev = tail; + tail = yylval.node; return 'a'; } -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - +]AT_YYERROR_DEFINE[ int main (void) { - return yyparse (); + int status = yyparse (); + while (tail) + { + count_node *prev = tail->prev; + free (tail); + tail = prev; + } + return status; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr7.c glr-regr7.y]], 0, [], -[glr-regr7.y: conflicts: 2 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr7.c glr-regr7.y]], 0, [], +[[glr-regr7.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr7]) -AT_CHECK([[./glr-regr7]], 2, [], +AT_PARSER_CHECK([[./glr-regr7]], 2, [], [memory exhausted ]) @@ -636,21 +643,21 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## ## Incorrect default location for empty right-hand sides. Adapted from bug ## -## report by Claudia Hermann. ## +## report by Claudia Hermann. ## ## See http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00069.html and ## ## http://lists.gnu.org/archive/html/bug-bison/2005-10/msg00072.html ## ## ------------------------------------------------------------------------- ## AT_SETUP([Incorrectly initialized location for empty right-hand side in GLR]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr8.y], [[ %{ #include #include - static void yyerror (char const *); - static int yylex (void); - static void yyerror(const char *msg); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ %} %token T_CONSTANT @@ -662,33 +669,29 @@ AT_DATA_GRAMMAR([glr-regr8.y], %% -PortClause : T_PORT InterfaceDeclaration T_PORT - { printf("%d/%d - %d/%d - %d/%d\n", - @1.first_column, @1.last_column, - @2.first_column, @2.last_column, - @3.first_column, @3.last_column); } - ; +PortClause : T_PORT InterfaceDeclaration T_PORT + { printf("%d/%d - %d/%d - %d/%d\n", + @1.first_column, @1.last_column, + @2.first_column, @2.last_column, + @3.first_column, @3.last_column); } + ; -InterfaceDeclaration : OptConstantWord %dprec 1 - | OptSignalWord %dprec 2 - ; +InterfaceDeclaration : OptConstantWord %dprec 1 + | OptSignalWord %dprec 2 + ; -OptConstantWord : /* empty */ - | T_CONSTANT - ; +OptConstantWord : /* empty */ + | T_CONSTANT + ; -OptSignalWord : /* empty */ - { printf("empty: %d/%d\n", @$.first_column, @$.last_column); } - | T_SIGNAL - ; +OptSignalWord : /* empty */ + { printf("empty: %d/%d\n", @$.first_column, @$.last_column); } + | T_SIGNAL + ; %% -void yyerror(const char *msg) -{ - fprintf (stderr, "error\n"); -} - +]AT_YYERROR_DEFINE[ static int lexIndex; int yylex (void) @@ -696,6 +699,8 @@ int yylex (void) lexIndex += 1; switch (lexIndex) { + default: + abort (); case 1: yylloc.first_column = 1; yylloc.last_column = 9; @@ -704,25 +709,21 @@ int yylex (void) yylloc.first_column = 13; yylloc.last_column = 17; return T_PORT; - default: + case 3: return 0; } } -int -main (void) -{ - yyparse(); - return 0; -} +]AT_MAIN_DEFINE[ ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr8.c glr-regr8.y]], 0, [], -[glr-regr8.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr8.c glr-regr8.y]], 0, [], +[[glr-regr8.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr8]) -AT_CHECK([[./glr-regr8]], 0, +AT_PARSER_CHECK([[./glr-regr8]], 0, [empty: 9/9 1/9 - 9/9 - 13/17 ], @@ -732,19 +733,20 @@ AT_CLEANUP ## ------------------------------------------------------------------------- ## -## No users destructors if stack 0 deleted. See ## +## No users destructors if stack 0 deleted. See ## ## . ## ## ------------------------------------------------------------------------- ## AT_SETUP([No users destructors if stack 0 deleted]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr9.y], [[ %{ # include # include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ # define YYSTACKEXPANDABLE 0 static int tokens = 0; static int destructors = 0; @@ -780,12 +782,7 @@ yylex (void) return 'a'; } -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - +]AT_YYERROR_DEFINE[ int main (void) { @@ -799,31 +796,34 @@ main (void) return !exit_status; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -o glr-regr9.c glr-regr9.y]], 0, [], -[glr-regr9.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr9.c glr-regr9.y]], 0, [], +[[glr-regr9.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr9]) -AT_CHECK([[./glr-regr9]], 0, [], +AT_PARSER_CHECK([[./glr-regr9]], 0, [], [memory exhausted ]) AT_CLEANUP -## ------------------------------------------------------------------------- ## -## Corrupted semantic options if user action cuts parse. ## -## ------------------------------------------------------------------------- ## +## ------------------------------------------------------ ## +## Corrupted semantic options if user action cuts parse. ## +## ------------------------------------------------------ ## AT_SETUP([Corrupted semantic options if user action cuts parse]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr10.y], [[ %{ +# include # include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ #define GARBAGE_SIZE 50 static char garbage[GARBAGE_SIZE]; %} @@ -840,51 +840,43 @@ start: ; %% - -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -static int -yylex (void) -{ - return 0; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ int main (void) { - int index; - for (index = 0; index < GARBAGE_SIZE; index+=1) - garbage[index] = 108; + int i; + for (i = 0; i < GARBAGE_SIZE; i+=1) + garbage[i] = 108; return yyparse (); } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -t -o glr-regr10.c glr-regr10.y]], 0, [], -[glr-regr10.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr10.c glr-regr10.y]], 0, [], +[[glr-regr10.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr10]) -AT_CHECK([[./glr-regr10]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr10]], 0, [], []) AT_CLEANUP -## ------------------------------------------------------------------------- ## -## Undesirable destructors if user action cuts parse. ## -## ------------------------------------------------------------------------- ## +## --------------------------------------------------- ## +## Undesirable destructors if user action cuts parse. ## +## --------------------------------------------------- ## AT_SETUP([Undesirable destructors if user action cuts parse]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr11.y], [[ %{ # include - static void yyerror (char const *); - static int yylex (void); + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ static int destructors = 0; # define USE(val) %} @@ -903,18 +895,8 @@ start: %% -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -static int -yylex (void) -{ - static char const *input = "a"; - return *input++; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["a"])[ int main (void) @@ -928,46 +910,90 @@ main (void) return exit_status; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -t -o glr-regr11.c glr-regr11.y]], 0, [], -[glr-regr11.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr11.c glr-regr11.y]], 0, [], +[[glr-regr11.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr11]) -AT_CHECK([[./glr-regr11]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr11]], 0, [], []) AT_CLEANUP -## ------------------------------------------------------------------------- ## -## Leaked merged semantic value if user action cuts parse. ## -## ------------------------------------------------------------------------- ## +## -------------------------------------------------- ## +## Leaked semantic values if user action cuts parse. ## +## -------------------------------------------------- ## -AT_SETUP([Leaked merged semantic value if user action cuts parse]) +AT_SETUP([Leaked semantic values if user action cuts parse]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr12.y], [[ %glr-parser %union { int dummy; } -%type start -%destructor { has_value = 0; } start +%token PARENT_RHS_AFTER +%type parent_rhs_before merged PARENT_RHS_AFTER +%destructor { parent_rhs_before_value = 0; } parent_rhs_before +%destructor { merged_value = 0; } merged +%destructor { parent_rhs_after_value = 0; } PARENT_RHS_AFTER %{ # include +# include static int merge (YYSTYPE, YYSTYPE); - static void yyerror (char const *); - static int yylex (void); - static int has_value = 0; + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static int parent_rhs_before_value = 0; + static int merged_value = 0; + static int parent_rhs_after_value = 0; # define USE(val) %} %% start: - %merge { has_value = 1; USE ($$); } - | %merge { USE ($$); YYACCEPT; } + alt1 %dprec 1 + | alt2 %dprec 2 ; +alt1: + PARENT_RHS_AFTER { + USE ($1); + parent_rhs_after_value = 0; + } + ; + +alt2: + parent_rhs_before merged PARENT_RHS_AFTER { + USE (($1, $2, $3)); + parent_rhs_before_value = 0; + merged_value = 0; + parent_rhs_after_value = 0; + } + ; + +parent_rhs_before: + { + USE ($$); + parent_rhs_before_value = 1; + } + ; + +merged: + %merge { + USE ($$); + merged_value = 1; + } + | cut %merge { + USE ($$); + merged_value = 1; + } + ; + +cut: { YYACCEPT; } ; + %% static int @@ -978,61 +1004,70 @@ merge (YYSTYPE s1, YYSTYPE s2) return dummy; } -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -static int -yylex (void) -{ - return 0; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE([{ PARENT_RHS_AFTER, 0 }], + [if (res == PARENT_RHS_AFTER) + parent_rhs_after_value = 1;])[ int main (void) { int exit_status = yyparse (); - if (has_value) + if (parent_rhs_before_value) { - fprintf (stderr, "Destructor not called.\n"); - return 1; + fprintf (stderr, "'parent_rhs_before' destructor not called.\n"); + exit_status = 1; + } + if (merged_value) + { + fprintf (stderr, "'merged' destructor not called.\n"); + exit_status = 1; + } + if (parent_rhs_after_value) + { + fprintf (stderr, "'PARENT_RHS_AFTER' destructor not called.\n"); + exit_status = 1; } return exit_status; } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -t -o glr-regr12.c glr-regr12.y]], 0, [], -[glr-regr12.y: conflicts: 1 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr12.c glr-regr12.y]], 0, [], +[[glr-regr12.y: warning: 1 shift/reduce conflict [-Wconflicts-sr] +glr-regr12.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr12]) -AT_CHECK([[./glr-regr12]], 0, [], []) +AT_PARSER_CHECK([[./glr-regr12]], 0, [], []) AT_CLEANUP ## ------------------------------------------------------------------------- ## -## Incorrect lookahead during deterministic GLR. See ## -## . ## +## Incorrect lookahead during deterministic GLR. See ## +## and ## +## . ## ## ------------------------------------------------------------------------- ## AT_SETUP([Incorrect lookahead during deterministic GLR]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr13.y], [[ /* Tests: - Defaulted state with initial yychar: yychar == YYEMPTY. - Nondefaulted state: yychar != YYEMPTY. - Defaulted state after lookahead: yychar != YYEMPTY. - - Defaulted state after shift: yychar == YYEMPTY. */ + - Defaulted state after shift: yychar == YYEMPTY. + - User action changing the lookahead. */ %{ #include - static void yyerror (char const *); - static int yylex (void); - static void print_look_ahead (char const *); + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static void print_lookahead (char const *); #define USE(value) %} @@ -1044,58 +1079,50 @@ AT_DATA_GRAMMAR([glr-regr13.y], %% start: - defstate_init defstate_shift 'b' { + defstate_init defstate_shift 'b' change_lookahead 'a' { USE ($3); - print_look_ahead ("start <- defstate_init defstate_shift 'b'"); + print_lookahead ("start <- defstate_init defstate_shift 'b'"); } ; defstate_init: { - print_look_ahead ("defstate_init <- empty string"); + print_lookahead ("defstate_init <- empty string"); } ; defstate_shift: nondefstate defstate_look 'a' { USE ($3); - print_look_ahead ("defstate_shift <- nondefstate defstate_look 'a'"); + print_lookahead ("defstate_shift <- nondefstate defstate_look 'a'"); } ; defstate_look: { - print_look_ahead ("defstate_look <- empty string"); + print_lookahead ("defstate_look <- empty string"); } ; nondefstate: { - print_look_ahead ("nondefstate <- empty string"); + print_lookahead ("nondefstate <- empty string"); } | 'b' { USE ($1); - print_look_ahead ("nondefstate <- 'b'"); + print_lookahead ("nondefstate <- 'b'"); + } + ; +change_lookahead: + { + yychar = 'a'; } ; %% -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -static int -yylex (void) -{ - static char const *input = "ab"; - static int index = 0; - yylloc.first_line = yylloc.last_line = 1; - yylloc.first_column = yylloc.last_column = index+1; - yylval.value = input[index] + 'A' - 'a'; - return input[index++]; -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["ab"], + [yylval.value = res + 'A' - 'a'])[ static void -print_look_ahead (char const *reduction) +print_lookahead (char const *reduction) { printf ("%s:\n yychar=", reduction); if (yychar == YYEMPTY) @@ -1106,10 +1133,10 @@ print_look_ahead (char const *reduction) { printf ("'%c', yylval='", yychar); if (yylval.value > ' ') - printf ("%c", yylval.value); + printf ("%c", yylval.value); printf ("', yylloc=(%d,%d),(%d,%d)", - yylloc.first_line, yylloc.first_column, - yylloc.last_line, yylloc.last_column); + yylloc.first_line, yylloc.first_column, + yylloc.last_line, yylloc.last_column); } printf ("\n"); } @@ -1122,11 +1149,12 @@ main (void) return yyparse (); } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -t -o glr-regr13.c glr-regr13.y]], 0, [], []) +AT_BISON_CHECK([[-o glr-regr13.c glr-regr13.y]], 0, [], []) AT_COMPILE([glr-regr13]) -AT_CHECK([[./glr-regr13]], 0, +AT_PARSER_CHECK([[./glr-regr13]], 0, [defstate_init <- empty string: yychar=YYEMPTY nondefstate <- empty string: @@ -1142,12 +1170,13 @@ start <- defstate_init defstate_shift 'b': AT_CLEANUP -## ------------------------------------------------------------------------- ## -## Incorrect lookahead during nondeterministic GLR. ## -## ------------------------------------------------------------------------- ## +## ------------------------------------------------- ## +## Incorrect lookahead during nondeterministic GLR. ## +## ------------------------------------------------- ## AT_SETUP([Incorrect lookahead during nondeterministic GLR]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([glr-regr14.y], [[ /* Tests: @@ -1172,10 +1201,12 @@ AT_DATA_GRAMMAR([glr-regr14.y], %union { char value; } %{ + #include #include - static void yyerror (char const *); - static int yylex (void); - static void print_look_ahead (char const *); + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static void print_lookahead (char const *); static char merge (union YYSTYPE, union YYSTYPE); #define USE(value) %} @@ -1189,7 +1220,7 @@ AT_DATA_GRAMMAR([glr-regr14.y], start: merge 'c' stack_explosion { USE ($2); USE ($3); - print_look_ahead ("start <- merge 'c' stack_explosion"); + print_lookahead ("start <- merge 'c' stack_explosion"); } ; @@ -1197,44 +1228,44 @@ start: merge: nonconflict1 'a' 'b' nonconflict2 %dprec 1 { USE ($2); USE ($3); - print_look_ahead ("merge <- nonconflict1 'a' 'b' nonconflict2"); + print_lookahead ("merge <- nonconflict1 'a' 'b' nonconflict2"); } | conflict defstate_look 'a' nonconflict2 'b' defstate_shift %dprec 2 { USE ($3); USE ($5); - print_look_ahead ("merge <- conflict defstate_look 'a' nonconflict2 'b'" - " defstate_shift"); + print_lookahead ("merge <- conflict defstate_look 'a' nonconflict2 'b'" + " defstate_shift"); } ; nonconflict1: { - print_look_ahead ("nonconflict1 <- empty string"); + print_lookahead ("nonconflict1 <- empty string"); } ; nonconflict2: { - print_look_ahead ("nonconflict2 <- empty string"); + print_lookahead ("nonconflict2 <- empty string"); } | 'a' { USE ($1); - print_look_ahead ("nonconflict2 <- 'a'"); + print_lookahead ("nonconflict2 <- 'a'"); } ; conflict: { - print_look_ahead ("conflict <- empty string"); + print_lookahead ("conflict <- empty string"); } ; defstate_look: { - print_look_ahead ("defstate_look <- empty string"); + print_lookahead ("defstate_look <- empty string"); } ; /* yychar != YYEMPTY but lookahead need is yyfalse. */ defstate_shift: { - print_look_ahead ("defstate_shift <- empty string"); + print_lookahead ("defstate_shift <- empty string"); } ; @@ -1249,7 +1280,7 @@ alt1: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1258,7 +1289,7 @@ alt2: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1267,7 +1298,7 @@ alt3: USE ($1); if (yychar != 'd' && yychar != YYEOF) { - fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); + fprintf (stderr, "Incorrect lookahead during stack explosion.\n"); } } ; @@ -1275,33 +1306,29 @@ no_look: { if (yychar != YYEMPTY) { - fprintf (stderr, - "Found lookahead where shouldn't during stack explosion.\n"); + fprintf (stderr, + "Found lookahead where shouldn't during stack explosion.\n"); } } ; %% -static void -yyerror (char const *msg) -{ - fprintf (stderr, "%s\n", msg); -} - +]AT_YYERROR_DEFINE[ static int yylex (void) { - static char const *input = "abcdddd"; - static int index = 0; + static char const input[] = "abcdddd"; + static size_t toknum; + assert (toknum < sizeof input); yylloc.first_line = yylloc.last_line = 1; - yylloc.first_column = yylloc.last_column = index+1; - yylval.value = input[index] + 'A' - 'a'; - return input[index++]; + yylloc.first_column = yylloc.last_column = toknum + 1; + yylval.value = input[toknum] + 'A' - 'a'; + return input[toknum++]; } static void -print_look_ahead (char const *reduction) +print_lookahead (char const *reduction) { printf ("%s:\n yychar=", reduction); if (yychar == YYEMPTY) @@ -1312,10 +1339,10 @@ print_look_ahead (char const *reduction) { printf ("'%c', yylval='", yychar); if (yylval.value > ' ') - printf ("%c", yylval.value); + printf ("%c", yylval.value); printf ("', yylloc=(%d,%d),(%d,%d)", - yylloc.first_line, yylloc.first_column, - yylloc.last_line, yylloc.last_column); + yylloc.first_line, yylloc.first_column, + yylloc.last_line, yylloc.last_column); } printf ("\n"); } @@ -1335,13 +1362,14 @@ main (void) return yyparse (); } ]]) +AT_BISON_OPTION_POPDEFS -AT_CHECK([[bison -t -o glr-regr14.c glr-regr14.y]], 0, [], -[glr-regr14.y: conflicts: 3 reduce/reduce -]) +AT_BISON_CHECK([[-o glr-regr14.c glr-regr14.y]], 0, [], +[[glr-regr14.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr] +]]) AT_COMPILE([glr-regr14]) -AT_CHECK([[./glr-regr14]], 0, +AT_PARSER_CHECK([[./glr-regr14]], 0, [conflict <- empty string: yychar='a', yylval='A', yylloc=(1,1),(1,1) defstate_look <- empty string: @@ -1357,3 +1385,367 @@ start <- merge 'c' stack_explosion: ], []) AT_CLEANUP + + +## ------------------------------------------------- ## +## Leaked semantic values when reporting ambiguity. ## +## ------------------------------------------------- ## + +AT_SETUP([Leaked semantic values when reporting ambiguity]) + +AT_BISON_OPTION_PUSHDEFS +AT_DATA_GRAMMAR([glr-regr15.y], +[[ +%glr-parser +%destructor { parent_rhs_before_value = 0; } parent_rhs_before + +%{ +# include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static int parent_rhs_before_value = 0; +# define USE(val) +%} + +%% + +start: + alt1 %dprec 1 + | alt2 %dprec 2 + ; + +/* This stack must be merged into the other stacks *last* (added at the + beginning of the semantic options list) so that yyparse will choose to clean + it up rather than the tree for which some semantic actions have been + performed. Thus, if yyreportAmbiguity longjmp's to yyparse, the values from + those other trees are not cleaned up. */ +alt1: ; + +alt2: + parent_rhs_before ambiguity { + USE ($1); + parent_rhs_before_value = 0; + } + ; + +parent_rhs_before: + { + USE ($$); + parent_rhs_before_value = 1; + } + ; + +ambiguity: ambiguity1 | ambiguity2 ; +ambiguity1: ; +ambiguity2: ; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ + +int +main (void) +{ + int exit_status = yyparse () != 1; + if (parent_rhs_before_value) + { + fprintf (stderr, "'parent_rhs_before' destructor not called.\n"); + exit_status = 1; + } + return exit_status; +} +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([[-o glr-regr15.c glr-regr15.y]], 0, [], +[[glr-regr15.y: warning: 2 reduce/reduce conflicts [-Wconflicts-rr] +]]) +AT_COMPILE([glr-regr15]) + +AT_PARSER_CHECK([[./glr-regr15]], 0, [], +[syntax is ambiguous +]) + +AT_CLEANUP + + +## ------------------------------------------------------------ ## +## Leaked lookahead after nondeterministic parse syntax error. ## +## ------------------------------------------------------------ ## + +AT_SETUP([Leaked lookahead after nondeterministic parse syntax error]) + +AT_BISON_OPTION_PUSHDEFS +AT_DATA_GRAMMAR([glr-regr16.y], +[[ +%glr-parser +%destructor { lookahead_value = 0; } 'b' + +%{ +# include +# include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ + static int lookahead_value = 0; +# define USE(val) +%} + +%% + +start: alt1 'a' | alt2 'a' ; +alt1: ; +alt2: ; + +%% + +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["ab"], + [if (res == 'b') + lookahead_value = 1])[ + +int +main (void) +{ + int exit_status = yyparse () != 1; + if (lookahead_value) + { + fprintf (stderr, "Lookahead destructor not called.\n"); + exit_status = 1; + } + return exit_status; +} +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([[-o glr-regr16.c glr-regr16.y]], 0, [], +[[glr-regr16.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) +AT_COMPILE([glr-regr16]) + +AT_PARSER_CHECK([[./glr-regr16]], 0, [], +[syntax error +]) + +AT_CLEANUP + + +## ------------------------------------------------- ## +## Uninitialized location when reporting ambiguity. ## +## ------------------------------------------------- ## + +AT_SETUP([Uninitialized location when reporting ambiguity]) + +AT_BISON_OPTION_PUSHDEFS([%glr-parser %locations %define api.pure]) + +AT_DATA_GRAMMAR([glr-regr17.y], +[[ +%glr-parser +%locations +%define api.pure +%error-verbose + +%union { int dummy; } + +%{ + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ +%} + +%% + +/* Tests the case of an empty RHS that has inherited the location of the + previous nonterminal, which is unresolved. That location is reported as the + last position of the ambiguity. */ +start: ambig1 empty1 | ambig2 empty2 ; + +/* Tests multiple levels of yyresolveLocations recursion. */ +ambig1: sub_ambig1 | sub_ambig2 ; +ambig2: sub_ambig1 | sub_ambig2 ; + +/* Tests the case of a non-empty RHS as well as the case of an empty RHS that + has inherited the initial location. The empty RHS's location is reported as + the first position in the ambiguity. */ +sub_ambig1: empty1 'a' 'b' ; +sub_ambig2: empty2 'a' 'b' ; +empty1: ; +empty2: ; + +%% +# include + +]AT_YYERROR_DEFINE[ +static int +yylex (YYSTYPE *lvalp, YYLTYPE *llocp) +{ + static char const input[] = "ab"; + static size_t toknum; + assert (toknum < sizeof input); + lvalp->dummy = 0; + llocp->first_line = llocp->last_line = 2; + llocp->first_column = toknum + 1; + llocp->last_column = llocp->first_column + 1; + return input[toknum++]; +} + +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([[-o glr-regr17.c glr-regr17.y]], 0, [], +[[glr-regr17.y: warning: 3 reduce/reduce conflicts [-Wconflicts-rr] +]]) +AT_COMPILE([glr-regr17]) + +AT_PARSER_CHECK([[./glr-regr17]], 1, [], +[1.1-2.2: syntax is ambiguous +]) + +AT_CLEANUP + + +## ------------------------------------------------------------- ## +## Missed %merge type warnings when LHS type is declared later. ## +## ------------------------------------------------------------- ## + +AT_SETUP([Missed %merge type warnings when LHS type is declared later]) + +AT_BISON_OPTION_PUSHDEFS +AT_DATA_GRAMMAR([glr-regr18.y], +[[%glr-parser + +%{ + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ +%} + +%union { + int type1; + int type2; + int type3; +} + +%% + +sym1: sym2 %merge { $$ = $1; } ; +sym2: sym3 %merge { $$ = $1; } ; +sym3: %merge { $$ = 0; } ; + +%type sym1; +%type sym2; +%type sym3; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([[-o glr-regr18.c glr-regr18.y]], 1, [], +[[glr-regr18.y:28.18-24: error: result type clash on merge function 'merge': != +glr-regr18.y:27.18-24: previous declaration +glr-regr18.y:29.13-19: error: result type clash on merge function 'merge': != +glr-regr18.y:28.18-24: previous declaration +]]) + +AT_CLEANUP + + +## ------------------- ## +## Ambiguity reports. ## +## ------------------- ## + +AT_SETUP([Ambiguity reports]) + +AT_BISON_OPTION_PUSHDEFS([%debug]) +AT_DATA_GRAMMAR([input.y], +[[ +%{ + #include + #include + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ +%} + +%debug +%glr-parser + +%% +start: + 'a' b 'c' d +| 'a' b 'c' d +; +b: 'b'; +d: /* nada. */; +%% +]AT_YYLEX_DEFINE(["abc"])[ +]AT_YYERROR_DEFINE[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([[-o input.c input.y]], 0, [], +[[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr] +]]) +AT_COMPILE([input]) + +AT_PARSER_CHECK([[./input --debug]], 1, [], +[Starting parse +Entering state 0 +Reading a token: Next token is token 'a' () +Shifting token 'a' () +Entering state 1 +Reading a token: Next token is token 'b' () +Shifting token 'b' () +Entering state 3 +Reducing stack 0 by rule 3 (line 27): + $1 = token 'b' () +-> $$ = nterm b () +Entering state 4 +Reading a token: Next token is token 'c' () +Shifting token 'c' () +Entering state 6 +Reducing stack 0 by rule 4 (line 28): +-> $$ = nterm d () +Entering state 7 +Reading a token: Now at end of input. +Stack 0 Entering state 7 +Now at end of input. +Splitting off stack 1 from 0. +Reduced stack 1 by rule #2; action deferred. Now in state 2. +Stack 1 Entering state 2 +Now at end of input. +Reduced stack 0 by rule #1; action deferred. Now in state 2. +Merging stack 0 into stack 1. +Stack 1 Entering state 2 +Now at end of input. +Removing dead stacks. +Rename stack 1 -> 0. +On stack 0, shifting token $end () +Stack 0 now in state #5 +Ambiguity detected. +Option 1, + start -> + 'a' + b + 'c' + d + +Option 2, + start -> + 'a' + b + 'c' + d + +syntax is ambiguous +Cleanup: popping token $end () +Cleanup: popping unresolved nterm start () +Cleanup: popping nterm d () +Cleanup: popping token 'c' () +Cleanup: popping nterm b () +Cleanup: popping token 'a' () +]) + +AT_CLEANUP