#include <stdarg.h>
static int MergeRule (int x0, int x1);
-static void yyerror(char const * s);
+static void yyerror (char const * s);
int yylex (void);
#define RULE(x) (1 << (x))
#include <stdlib.h>
static void yyerror (char const *);
static int yylex (void);
- static void yyerror(const char *msg);
+ static void yyerror (char const *msg);
%}
%token T_CONSTANT
%%
-void yyerror(const char *msg)
+void
+yyerror (char const *msg)
{
- fprintf (stderr, "error\n");
+ fprintf (stderr, "%s\n", msg);
}
static int lexIndex;
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_CHECK([[bison -t -o glr-regr10.c glr-regr10.y]], 0, [],
+AT_CHECK([[bison -o glr-regr10.c glr-regr10.y]], 0, [],
[glr-regr10.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr10])
}
]])
-AT_CHECK([[bison -t -o glr-regr11.c glr-regr11.y]], 0, [],
+AT_CHECK([[bison -o glr-regr11.c glr-regr11.y]], 0, [],
[glr-regr11.y: conflicts: 1 reduce/reduce
])
AT_COMPILE([glr-regr11])
## ------------------------------------------------------------------------- ##
-## 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_DATA_GRAMMAR([glr-regr12.y],
[[
%glr-parser
%union { int dummy; }
-%type <dummy> start
-%destructor { has_value = 0; } start
+%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>
static int merge (YYSTYPE, YYSTYPE);
static void yyerror (char const *);
static int yylex (void);
- static int has_value = 0;
+ static int parent_rhs_before_value = 0;
+ static int merged_value = 0;
+ static int parent_rhs_after_value = 0;
# define USE(val)
%}
%%
start:
- %merge<merge> { has_value = 1; USE ($$); }
- | %merge<merge> { USE ($$); 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 ($$);
+ parent_rhs_before_value = 1;
+ }
+ ;
+
+merged:
+ %merge<merge> {
+ USE ($$);
+ merged_value = 1;
+ }
+ | cut %merge<merge> {
+ USE ($$);
+ merged_value = 1;
+ }
+ ;
+
+cut: { YYACCEPT; } ;
+
%%
static int
static int
yylex (void)
{
- return 0;
+ static int const input[] = { PARENT_RHS_AFTER, 0 };
+ static const int *inputp = input;
+ if (*inputp == PARENT_RHS_AFTER)
+ parent_rhs_after_value = 1;
+ return *inputp++;
}
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_CHECK([[bison -t -o glr-regr12.c glr-regr12.y]], 0, [],
-[glr-regr12.y: conflicts: 1 reduce/reduce
+AT_CHECK([[bison -o glr-regr12.c glr-regr12.y]], 0, [],
+[glr-regr12.y: conflicts: 1 shift/reduce, 1 reduce/reduce
])
AT_COMPILE([glr-regr12])
## ------------------------------------------------------------------------- ##
## Incorrect lookahead during deterministic GLR. See ##
-## <http://lists.gnu.org/archive/html/help-bison/2005-07/msg00017.html>. ##
+## <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])
- 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 <stdio.h>
%%
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_look_ahead ("nondefstate <- 'b'");
}
;
+change_lookahead:
+ {
+ yychar = 'a';
+ }
+ ;
%%
yylex (void)
{
static char const *input = "ab";
- static int index = 0;
+ static int i = 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++];
+ yylloc.first_column = yylloc.last_column = i + 1;
+ yylval.value = input[i] + 'A' - 'a';
+ return input[i++];
}
static void
}
]])
-AT_CHECK([[bison -t -o glr-regr13.c glr-regr13.y]], 0, [], [])
+AT_CHECK([[bison -o glr-regr13.c glr-regr13.y]], 0, [], [])
AT_COMPILE([glr-regr13])
AT_CHECK([[./glr-regr13]], 0,
AT_DATA_GRAMMAR([glr-regr14.y],
[[
/* Tests:
- - Conflicting actions (split-off parse, which copies lookahead status,
+ - 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 status and RHS from different stack
+ - 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 status is yyfalse (a previous stack has
+ - 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 status array.
+ 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
}
;
-/* When merging the 2 deferred actions, the lookahead statuses are
- different. */
+/* When merging the 2 deferred actions, the lookahead needs are different. */
merge:
nonconflict1 'a' 'b' nonconflict2 %dprec 1 {
USE ($2); USE ($3);
}
;
-/* yychar != YYEMPTY but lookahead status is yyfalse. */
+/* yychar != YYEMPTY but lookahead need is yyfalse. */
defstate_shift:
{
print_look_ahead ("defstate_shift <- empty string");
yylex (void)
{
static char const *input = "abcdddd";
- static int index = 0;
+ static int i = 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++];
+ yylloc.first_column = yylloc.last_column = i + 1;
+ yylval.value = input[i] + 'A' - 'a';
+ return input[i++];
}
static void
}
]])
-AT_CHECK([[bison -t -o glr-regr14.c glr-regr14.y]], 0, [],
+AT_CHECK([[bison -o glr-regr14.c glr-regr14.y]], 0, [],
[glr-regr14.y: conflicts: 3 reduce/reduce
])
AT_COMPILE([glr-regr14])
], [])
AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## Leaked semantic values when reporting ambiguity. ##
+## ------------------------------------------------------------------------- ##
+
+AT_SETUP([Leaked semantic values when reporting ambiguity])
+
+AT_DATA_GRAMMAR([glr-regr15.y],
+[[
+%glr-parser
+%destructor { parent_rhs_before_value = 0; } parent_rhs_before
+
+%{
+# include <stdlib.h>
+ static void yyerror (char const *);
+ static int yylex (void);
+ 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: ;
+
+%%
+
+static void
+yyerror (char const *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+static int
+yylex (void)
+{
+ return 0;
+}
+
+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_CHECK([[bison -o glr-regr15.c glr-regr15.y]], 0, [],
+[glr-regr15.y: conflicts: 2 reduce/reduce
+])
+AT_COMPILE([glr-regr15])
+
+AT_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_DATA_GRAMMAR([glr-regr16.y],
+[[
+%glr-parser
+%destructor { lookahead_value = 0; } 'b'
+
+%{
+# include <stdlib.h>
+ static void yyerror (char const *);
+ static int yylex (void);
+ static int lookahead_value = 0;
+# define USE(val)
+%}
+
+%%
+
+start: alt1 'a' | alt2 'a' ;
+alt1: ;
+alt2: ;
+
+%%
+
+static void
+yyerror (char const *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+static int
+yylex (void)
+{
+ static char const *input = "ab";
+ if (*input == 'b')
+ lookahead_value = 1;
+ return *input++;
+}
+
+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_CHECK([[bison -o glr-regr16.c glr-regr16.y]], 0, [],
+[glr-regr16.y: conflicts: 1 reduce/reduce
+])
+AT_COMPILE([glr-regr16])
+
+AT_CHECK([[./glr-regr16]], 0, [],
+[syntax error
+])
+
+AT_CLEANUP
+
+
+## ------------------------------------------------------------------------- ##
+## Uninitialized location when reporting ambiguity. ##
+## ------------------------------------------------------------------------- ##
+
+AT_SETUP([Uninitialized location when reporting ambiguity])
+AT_DATA_GRAMMAR([glr-regr17.y],
+[[
+%glr-parser
+%locations
+%pure-parser
+%error-verbose
+
+%union { int dummy; }
+
+%{
+ static void yyerror (YYLTYPE *, char const *);
+ static int yylex (YYSTYPE *, YYLTYPE *);
+%}
+
+%initial-action {
+ @$.first_line = 1;
+ @$.first_column = 1;
+ @$.last_line = 1;
+ @$.last_column = 1;
+}
+
+%%
+
+/* 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: ;
+
+%%
+
+static void
+yyerror (YYLTYPE *locp, char const *msg)
+{
+ fprintf (stderr, "Error at %d.%d-%d.%d: %s.\n", locp->first_line,
+ locp->first_column, locp->last_line, locp->last_column, msg);
+}
+
+static int
+yylex (YYSTYPE *lvalp, YYLTYPE *llocp)
+{
+ static char const input[] = "ab";
+ static char const *inputp = input;
+ lvalp->dummy = 0;
+ llocp->first_line = llocp->last_line = 2;
+ llocp->first_column = inputp - input + 1;
+ llocp->last_column = llocp->first_column + 1;
+ return *inputp++;
+}
+
+int
+main (void)
+{
+ return yyparse () != 1;
+}
+]])
+
+AT_CHECK([[bison -o glr-regr17.c glr-regr17.y]], 0, [],
+[glr-regr17.y: conflicts: 3 reduce/reduce
+])
+AT_COMPILE([glr-regr17])
+
+AT_CHECK([[./glr-regr17]], 0, [],
+[Error at 1.1-2.3: syntax is ambiguous.
+])
+
+AT_CLEANUP
projects / bison.git / blobdiff