+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## 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 <stdlib.h>
+# include <stdio.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+ #define GARBAGE_SIZE 50
+ static char garbage[GARBAGE_SIZE];
+%}
+
+%glr-parser
+%union { char *ptr; }
+%type <ptr> start
+
+%%
+
+start:
+ %dprec 2 { $$ = garbage; YYACCEPT; }
+ | %dprec 1 { $$ = garbage; YYACCEPT; }
+ ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+
+int
+main (void)
+{
+ int i;
+ for (i = 0; i < GARBAGE_SIZE; i+=1)
+ garbage[i] = 108;
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+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_PARSER_CHECK([[./glr-regr10]], 0, [], [])
+
+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## 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 <stdlib.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+ static int destructors = 0;
+# define USE(val)
+%}
+
+%glr-parser
+%union { int dummy; }
+%type <int> 'a'
+%destructor { destructors += 1; } 'a'
+
+%%
+
+start:
+ 'a' %dprec 2 { USE ($1); destructors += 1; YYACCEPT; }
+ | 'a' %dprec 1 { USE ($1); destructors += 1; YYACCEPT; }
+ ;
+
+%%
+
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["a"])[
+
+int
+main (void)
+{
+ int exit_status = yyparse ();
+ if (destructors != 1)
+ {
+ fprintf (stderr, "Destructor calls: %d\n", destructors);
+ return 1;
+ }
+ return exit_status;
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+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_PARSER_CHECK([[./glr-regr11]], 0, [], [])
+
+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## Leaked semantic values 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; }
+%token PARENT_RHS_AFTER
+%type <dummy> 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 <stdlib.h>
+# include <assert.h>
+ static int merge (YYSTYPE, YYSTYPE);
+ ]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:
+ 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 ($$);
+ parent_rhs_before_value = 1;
+ }
+ ;
+
+merged:
+ %merge<merge> {
+ USE ($$);
+ merged_value = 1;
+ }
+ | cut %merge<merge> {
+ USE ($$);
+ merged_value = 1;
+ }
+ ;
+
+cut: { YYACCEPT; } ;
+
+%%
+
+static int
+merge (YYSTYPE s1, YYSTYPE s2)
+{
+ /* Not invoked. */
+ char dummy = s1.dummy + s2.dummy;
+ return dummy;
+}
+
+]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 (parent_rhs_before_value)
+ {
+ 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_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_PARSER_CHECK([[./glr-regr12]], 0, [], [])
+
+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## Incorrect lookahead during deterministic GLR. See ##
+## <http://lists.gnu.org/archive/html/help-bison/2005-07/msg00017.html> and ##
+## <http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00060.html>. ##
+## ------------------------------------------------------------------------- ##
+
+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.
+ - User action changing the lookahead. */
+
+%{
+ #include <stdio.h>
+ #include <assert.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+ static void print_lookahead (char const *);
+ #define USE(value)
+%}
+
+%union { char value; }
+%type <value> 'a' 'b'
+%glr-parser
+%locations
+
+%%
+
+start:
+ defstate_init defstate_shift 'b' change_lookahead 'a' {
+ USE ($3);
+ print_lookahead ("start <- defstate_init defstate_shift 'b'");
+ }
+ ;
+defstate_init:
+ {
+ print_lookahead ("defstate_init <- empty string");
+ }
+ ;
+defstate_shift:
+ nondefstate defstate_look 'a' {
+ USE ($3);
+ print_lookahead ("defstate_shift <- nondefstate defstate_look 'a'");
+ }
+ ;
+defstate_look:
+ {
+ print_lookahead ("defstate_look <- empty string");
+ }
+ ;
+nondefstate:
+ {
+ print_lookahead ("nondefstate <- empty string");
+ }
+ | 'b' {
+ USE ($1);
+ print_lookahead ("nondefstate <- 'b'");
+ }
+ ;
+change_lookahead:
+ {
+ yychar = 'a';
+ }
+ ;
+
+%%
+
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["ab"],
+ [yylval.value = res + 'A' - 'a'])[
+
+static void
+print_lookahead (char const *reduction)
+{
+ printf ("%s:\n yychar=", reduction);
+ if (yychar == YYEMPTY)
+ printf ("YYEMPTY");
+ else if (yychar == YYEOF)
+ printf ("YYEOF");
+ else
+ {
+ printf ("'%c', yylval='", yychar);
+ if (yylval.value > ' ')
+ printf ("%c", yylval.value);
+ printf ("', yylloc=(%d,%d),(%d,%d)",
+ yylloc.first_line, yylloc.first_column,
+ yylloc.last_line, yylloc.last_column);
+ }
+ printf ("\n");
+}
+
+int
+main (void)
+{
+ yychar = '#'; /* Not a token in the grammar. */
+ yylval.value = '!';
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o glr-regr13.c glr-regr13.y]], 0, [], [])
+AT_COMPILE([glr-regr13])
+
+AT_PARSER_CHECK([[./glr-regr13]], 0,
+[defstate_init <- empty string:
+ yychar=YYEMPTY
+nondefstate <- empty string:
+ yychar='a', yylval='A', yylloc=(1,1),(1,1)
+defstate_look <- empty string:
+ yychar='a', yylval='A', yylloc=(1,1),(1,1)
+defstate_shift <- nondefstate defstate_look 'a':
+ yychar=YYEMPTY
+start <- defstate_init defstate_shift 'b':
+ yychar=YYEMPTY
+], [])
+
+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## Incorrect lookahead during nondeterministic GLR. ##
+## ------------------------------------------------------------------------- ##
+
+AT_SETUP([Incorrect lookahead during nondeterministic GLR])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([glr-regr14.y],
+[[
+/* Tests:
+ - Conflicting actions (split-off parse, which copies lookahead need,
+ which is necessarily yytrue) and nonconflicting actions (non-split-off
+ parse) for nondefaulted state: yychar != YYEMPTY.
+ - Merged deferred actions (lookahead need and RHS from different stack
+ than the target state) and nonmerged deferred actions (same stack).
+ - Defaulted state after lookahead: yychar != YYEMPTY.
+ - Defaulted state after shift: yychar == YYEMPTY.
+ - yychar != YYEMPTY but lookahead need is yyfalse (a previous stack has
+ seen the lookahead but current stack has not).
+ - Exceeding stack capacity (stack explosion), and thus reallocating
+ lookahead need array.
+ Note that it does not seem possible to see the initial yychar value during
+ nondeterministic operation since:
+ - In order to preserve the initial yychar, only defaulted states may be
+ entered.
+ - If only defaulted states are entered, there are no conflicts, so
+ nondeterministic operation does not start. */
+
+%union { char value; }
+
+%{
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <assert.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+ static void print_lookahead (char const *);
+ static char merge (union YYSTYPE, union YYSTYPE);
+ #define USE(value)
+%}
+
+%type <value> 'a' 'b' 'c' 'd' stack_explosion
+%glr-parser
+%locations
+
+%%
+
+start:
+ merge 'c' stack_explosion {
+ USE ($2); USE ($3);
+ print_lookahead ("start <- merge 'c' stack_explosion");
+ }
+ ;
+
+/* When merging the 2 deferred actions, the lookahead needs are different. */
+merge:
+ nonconflict1 'a' 'b' nonconflict2 %dprec 1 {
+ USE ($2); USE ($3);
+ print_lookahead ("merge <- nonconflict1 'a' 'b' nonconflict2");
+ }
+ | conflict defstate_look 'a' nonconflict2 'b' defstate_shift %dprec 2 {
+ USE ($3); USE ($5);
+ print_lookahead ("merge <- conflict defstate_look 'a' nonconflict2 'b'"
+ " defstate_shift");
+ }
+ ;
+
+nonconflict1:
+ {
+ print_lookahead ("nonconflict1 <- empty string");
+ }
+ ;
+nonconflict2:
+ {
+ print_lookahead ("nonconflict2 <- empty string");
+ }
+ | 'a' {
+ USE ($1);
+ print_lookahead ("nonconflict2 <- 'a'");
+ }
+ ;
+conflict:
+ {
+ print_lookahead ("conflict <- empty string");
+ }
+ ;
+defstate_look:
+ {
+ print_lookahead ("defstate_look <- empty string");
+ }
+ ;
+
+/* yychar != YYEMPTY but lookahead need is yyfalse. */
+defstate_shift:
+ {
+ print_lookahead ("defstate_shift <- empty string");
+ }
+ ;
+
+stack_explosion:
+ { $$ = '\0'; }
+ | alt1 stack_explosion %merge<merge> { $$ = $2; }
+ | alt2 stack_explosion %merge<merge> { $$ = $2; }
+ | alt3 stack_explosion %merge<merge> { $$ = $2; }
+ ;
+alt1:
+ 'd' no_look {
+ USE ($1);
+ if (yychar != 'd' && yychar != YYEOF)
+ {
+ fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
+ }
+ }
+ ;
+alt2:
+ 'd' no_look {
+ USE ($1);
+ if (yychar != 'd' && yychar != YYEOF)
+ {
+ fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
+ }
+ }
+ ;
+alt3:
+ 'd' no_look {
+ USE ($1);
+ if (yychar != 'd' && yychar != YYEOF)
+ {
+ fprintf (stderr, "Incorrect lookahead during stack explosion.\n");
+ }
+ }
+ ;
+no_look:
+ {
+ if (yychar != YYEMPTY)
+ {
+ fprintf (stderr,
+ "Found lookahead where shouldn't during stack explosion.\n");
+ }
+ }
+ ;
+
+%%
+
+]AT_YYERROR_DEFINE[
+static int
+yylex (void)
+{
+ 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 = toknum + 1;
+ yylval.value = input[toknum] + 'A' - 'a';
+ return input[toknum++];
+}
+
+static void
+print_lookahead (char const *reduction)
+{
+ printf ("%s:\n yychar=", reduction);
+ if (yychar == YYEMPTY)
+ printf ("YYEMPTY");
+ else if (yychar == YYEOF)
+ printf ("YYEOF");
+ else
+ {
+ printf ("'%c', yylval='", yychar);
+ if (yylval.value > ' ')
+ printf ("%c", yylval.value);
+ printf ("', yylloc=(%d,%d),(%d,%d)",
+ yylloc.first_line, yylloc.first_column,
+ yylloc.last_line, yylloc.last_column);
+ }
+ printf ("\n");
+}
+
+static char
+merge (union YYSTYPE s1, union YYSTYPE s2)
+{
+ char dummy = s1.value + s2.value;
+ return dummy;
+}
+
+int
+main (void)
+{
+ yychar = '#'; /* Not a token in the grammar. */
+ yylval.value = '!';
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+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_PARSER_CHECK([[./glr-regr14]], 0,
+[conflict <- empty string:
+ yychar='a', yylval='A', yylloc=(1,1),(1,1)
+defstate_look <- empty string:
+ yychar='a', yylval='A', yylloc=(1,1),(1,1)
+nonconflict2 <- empty string:
+ yychar='b', yylval='B', yylloc=(1,2),(1,2)
+defstate_shift <- empty string:
+ yychar=YYEMPTY
+merge <- conflict defstate_look 'a' nonconflict2 'b' defstate_shift:
+ yychar=YYEMPTY
+start <- merge 'c' stack_explosion:
+ yychar=YYEOF
+], [])
+
+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 <stdlib.h>
+ ]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 <stdlib.h>
+# include <assert.h>
+ ]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 <assert.h>
+
+]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++];
+}
+
+int
+main (void)
+{
+ return yyparse () != 1;
+}
+]])
+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]], 0, [],
+[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 <stdlib.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+%}
+
+%union {
+ int type1;
+ int type2;
+ int type3;
+}
+
+%%
+
+sym1: sym2 %merge<merge> { $$ = $1; } ;
+sym2: sym3 %merge<merge> { $$ = $1; } ;
+sym3: %merge<merge> { $$ = 0; } ;
+
+%type <type1> sym1;
+%type <type2> sym2;
+%type <type3> sym3;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+int
+main (void)
+{
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o glr-regr18.c glr-regr18.y]], 1, [],
+[[glr-regr18.y:26.18-24: error: result type clash on merge function 'merge': <type2> != <type1>
+glr-regr18.y:25.18-24: previous declaration
+glr-regr18.y:27.13-19: error: result type clash on merge function 'merge': <type3> != <type2>
+glr-regr18.y:26.18-24: previous declaration
+]])
+
+AT_CLEANUP
+
+
+## ------------------- ##
+## Ambiguity reports. ##
+## ------------------- ##
+
+AT_SETUP([Ambiguity reports])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([input.y],
+[[
+%{
+ #include <stdio.h>
+ #include <stdlib.h>
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+%}
+
+%debug
+%glr-parser
+
+%%
+start:
+ 'a' b 'c' d
+| 'a' b 'c' d
+;
+b: 'b';
+d: /* nada. */;
+%%
+]AT_YYLEX_DEFINE(["abc"])[
+]AT_YYERROR_DEFINE[
+int
+main (void)
+{
+ yydebug = 1;
+ return !!yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o input.c input.y]], 0, [],
+[[input.y: warning: 1 reduce/reduce conflict [-Wconflicts-rr]
+]])
+AT_COMPILE([input])
+
+AT_PARSER_CHECK([[./input]], 1, [],
+[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' ()
+Shifting token 'a' ()
+Entering state 1
+Reading a token: Next token is token 'b' ()
+Shifting token 'b' ()
+Entering state 3
+Reducing stack 0 by rule 3 (line 25):
+ $1 = token 'b' ()
+-> $$ = 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 26):
+-> $$ = 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 -> <Rule 1, tokens 1 .. 3>
+ 'a' <tokens 1 .. 1>
+ b <tokens 2 .. 2>
+ 'c' <tokens 3 .. 3>
+ d <empty>
+
+Option 2,
+ start -> <Rule 2, tokens 1 .. 3>
+ 'a' <tokens 1 .. 1>
+ b <tokens 2 .. 2>
+ 'c' <tokens 3 .. 3>
+ d <empty>
+
+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' ()
projects / bison.git / blobdiff