# Exercising Bison on conflicts. -*- Autotest -*-
-# Copyright (C) 2002 Free Software Foundation, Inc.
+
+# Copyright (C) 2002, 2003, 2004, 2005 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
# 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., 59 Temple Place - Suite 330, Boston, MA
-# 02111-1307, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
AT_BANNER([[Conflicts.]])
e: 'e' | /* Nothing. */;
]])
-AT_CHECK([bison input.y -o input.c])
+AT_CHECK([bison -o input.c input.y], 0, [],
+[[input.y:4.9: warning: rule never reduced because of conflicts: e: /* empty */
+]])
AT_CLEANUP
+
## ------------------- ##
## %nonassoc and eof. ##
## ------------------- ##
AT_SETUP([%nonassoc and eof])
-AT_DATA([input.y],
+AT_DATA_GRAMMAR([input.y],
[[
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <error.h>
+
#define YYERROR_VERBOSE 1
-#define yyerror(Msg) \
-do { \
- fprintf (stderr, "%s\n", Msg); \
- exit (1); \
-} while (0)
+static void
+yyerror (const char *msg)
+{
+ fprintf (stderr, "%s\n", 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++];
}
%}
int
main (int argc, const char *argv[])
{
- if (argc > 1)
- input = argv[1];
+ input = argc <= 1 ? "" : argv[1];
return yyparse ();
}
]])
# Specify the output files to avoid problems on different file systems.
-AT_CHECK([bison input.y -o input.c])
-AT_CHECK([$CC $CFLAGS $CPPFLAGS input.c -o input], 0, [], [ignore])
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
-AT_CHECK([./input '0<0'])
+AT_PARSER_CHECK([./input '0<0'])
# FIXME: This is an actual bug, but a new one, in the sense that
# no one has ever spotted it! The messages are *wrong*: there should
# be nothing there, it should be expected eof.
-AT_CHECK([./input '0<0<0'], [1], [],
- [parse error, unexpected '<', expecting '<' or '>'
+AT_PARSER_CHECK([./input '0<0<0'], [1], [],
+ [syntax error, unexpected '<', expecting '<' or '>'
])
-AT_CHECK([./input '0>0'])
-AT_CHECK([./input '0>0>0'], [1], [],
- [parse error, unexpected '>', expecting '<' or '>'
+AT_PARSER_CHECK([./input '0>0'])
+AT_PARSER_CHECK([./input '0>0>0'], [1], [],
+ [syntax error, unexpected '>', expecting '<' or '>'
])
-AT_CHECK([./input '0<0>0'], [1], [],
- [parse error, unexpected '>', expecting '<' or '>'
+AT_PARSER_CHECK([./input '0<0>0'], [1], [],
+ [syntax error, unexpected '>', expecting '<' or '>'
])
AT_CLEANUP
AT_SETUP([Unresolved SR Conflicts])
+AT_KEYWORDS([report])
+
AT_DATA([input.y],
[[%token NUM OP
%%
exp: exp OP exp | NUM;
]])
-AT_CHECK([bison input.y -o input.c -v], 0, [],
-[input.y contains 1 shift/reduce conflict.
+AT_CHECK([bison -o input.c --report=all input.y], 0, [],
+[input.y: conflicts: 1 shift/reduce
])
# Check the contents of the report.
AT_CHECK([cat input.output], [],
-[[State 5 contains 1 shift/reduce conflict.
+[[State 5 conflicts: 1 shift/reduce
Grammar
- Number, Line, Rule
- 0 3 $axiom -> exp $
- 1 3 exp -> exp OP exp
- 2 3 exp -> NUM
+ 0 $accept: exp $end
+
+ 1 exp: exp OP exp
+ 2 | NUM
Terminals, with rules where they appear
-$ (0) 0
+$end (0) 0
error (256)
-NUM (257) 2
-OP (258) 1
+NUM (258) 2
+OP (259) 1
Nonterminals, with rules where they appear
-$axiom (5)
+$accept (5)
on left: 0
exp (6)
on left: 1 2, on right: 0 1
state 0
- $axiom -> . exp $ (rule 0)
+ 0 $accept: . exp $end
+ 1 exp: . exp OP exp
+ 2 | . NUM
- NUM shift, and go to state 1
-
- exp go to state 2
+ NUM shift, and go to state 1
+ exp go to state 2
state 1
- exp -> NUM . (rule 2)
-
- $default reduce using rule 2 (exp)
+ 2 exp: NUM .
+ $default reduce using rule 2 (exp)
state 2
- $axiom -> exp . $ (rule 0)
- exp -> exp . OP exp (rule 1)
-
- $ shift, and go to state 3
- OP shift, and go to state 4
+ 0 $accept: exp . $end
+ 1 exp: exp . OP exp
+ $end shift, and go to state 3
+ OP shift, and go to state 4
state 3
- $axiom -> exp $ . (rule 0)
+ 0 $accept: exp $end .
- $default accept
+ $default accept
state 4
- exp -> exp OP . exp (rule 1)
-
- NUM shift, and go to state 1
+ 1 exp: . exp OP exp
+ 1 | exp OP . exp
+ 2 | . NUM
- exp go to state 5
+ NUM shift, and go to state 1
+ exp go to state 5
state 5
- exp -> exp . OP exp (rule 1)
- exp -> exp OP exp . (rule 1)
-
- OP shift, and go to state 4
-
- OP [reduce using rule 1 (exp)]
- $default reduce using rule 1 (exp)
-
+ 1 exp: exp . OP exp [$end, OP]
+ 1 | exp OP exp . [$end, OP]
+ OP shift, and go to state 4
+ OP [reduce using rule 1 (exp)]
+ $default reduce using rule 1 (exp)
]])
AT_CLEANUP
-## --------------------- ##
-## Solved SR Conflicts. ##
-## --------------------- ##
-AT_SETUP([Solved SR Conflicts])
+## ----------------------- ##
+## Resolved SR Conflicts. ##
+## ----------------------- ##
+
+AT_SETUP([Resolved SR Conflicts])
+
+AT_KEYWORDS([report])
AT_DATA([input.y],
[[%token NUM OP
-%right OP
+%left OP
%%
exp: exp OP exp | NUM;
]])
-AT_CHECK([bison input.y -o input.c -v], 0, [], [])
+AT_CHECK([bison -o input.c --report=all input.y])
# Check the contents of the report.
AT_CHECK([cat input.output], [],
-[[Conflict in state 5 between rule 2 and token OP resolved as shift.
-
+[[Grammar
-Grammar
+ 0 $accept: exp $end
- Number, Line, Rule
- 0 4 $axiom -> exp $
- 1 4 exp -> exp OP exp
- 2 4 exp -> NUM
+ 1 exp: exp OP exp
+ 2 | NUM
Terminals, with rules where they appear
-$ (0) 0
+$end (0) 0
error (256)
-NUM (257) 2
-OP (258) 1
+NUM (258) 2
+OP (259) 1
Nonterminals, with rules where they appear
-$axiom (5)
+$accept (5)
on left: 0
exp (6)
on left: 1 2, on right: 0 1
state 0
- $axiom -> . exp $ (rule 0)
+ 0 $accept: . exp $end
+ 1 exp: . exp OP exp
+ 2 | . NUM
- NUM shift, and go to state 1
-
- exp go to state 2
+ NUM shift, and go to state 1
+ exp go to state 2
state 1
- exp -> NUM . (rule 2)
-
- $default reduce using rule 2 (exp)
+ 2 exp: NUM .
+ $default reduce using rule 2 (exp)
state 2
- $axiom -> exp . $ (rule 0)
- exp -> exp . OP exp (rule 1)
-
- $ shift, and go to state 3
- OP shift, and go to state 4
+ 0 $accept: exp . $end
+ 1 exp: exp . OP exp
+ $end shift, and go to state 3
+ OP shift, and go to state 4
state 3
- $axiom -> exp $ . (rule 0)
+ 0 $accept: exp $end .
- $default accept
+ $default accept
state 4
- exp -> exp OP . exp (rule 1)
-
- NUM shift, and go to state 1
+ 1 exp: . exp OP exp
+ 1 | exp OP . exp
+ 2 | . NUM
- exp go to state 5
+ NUM shift, and go to state 1
+ exp go to state 5
state 5
- exp -> exp . OP exp (rule 1)
- exp -> exp OP exp . (rule 1)
+ 1 exp: exp . OP exp [$end, OP]
+ 1 | exp OP exp . [$end, OP]
- OP shift, and go to state 4
+ $default reduce using rule 1 (exp)
- $default reduce using rule 1 (exp)
+ Conflict between rule 1 and token OP resolved as reduce (%left OP).
+]])
+AT_CLEANUP
+## -------------------------------- ##
+## Defaulted Conflicted Reduction. ##
+## -------------------------------- ##
+
+# When there are RR conflicts, some rules are disabled. Usually it is
+# simply displayed as:
+#
+# $end reduce using rule 3 (num)
+# $end [reduce using rule 4 (id)]
+#
+# But when `reduce 3' is the default action, we'd produce:
+#
+# $end [reduce using rule 4 (id)]
+# $default reduce using rule 3 (num)
+#
+# In this precise case (a reduction is masked by the default
+# reduction), we make the `reduce 3' explicit:
+#
+# $end reduce using rule 3 (num)
+# $end [reduce using rule 4 (id)]
+# $default reduce using rule 3 (num)
+#
+# Maybe that's not the best display, but then, please propose something
+# else.
+
+AT_SETUP([Defaulted Conflicted Reduction])
+AT_KEYWORDS([report])
+
+AT_DATA([input.y],
+[[%%
+exp: num | id;
+num: '0';
+id : '0';
+%%
+]])
+
+AT_CHECK([bison -o input.c --report=all input.y], 0, [],
+[[input.y: conflicts: 1 reduce/reduce
+input.y:4.6-8: warning: rule never reduced because of conflicts: id: '0'
+]])
+
+# Check the contents of the report.
+AT_CHECK([cat input.output], [],
+[[Rules never reduced
+
+ 4 id: '0'
+
+
+State 1 conflicts: 1 reduce/reduce
+
+
+Grammar
+
+ 0 $accept: exp $end
+
+ 1 exp: num
+ 2 | id
+
+ 3 num: '0'
+
+ 4 id: '0'
+
+
+Terminals, with rules where they appear
+
+$end (0) 0
+'0' (48) 3 4
+error (256)
+
+
+Nonterminals, with rules where they appear
+
+$accept (4)
+ on left: 0
+exp (5)
+ on left: 1 2, on right: 0
+num (6)
+ on left: 3, on right: 1
+id (7)
+ on left: 4, on right: 2
+
+
+state 0
+
+ 0 $accept: . exp $end
+ 1 exp: . num
+ 2 | . id
+ 3 num: . '0'
+ 4 id: . '0'
+
+ '0' shift, and go to state 1
+
+ exp go to state 2
+ num go to state 3
+ id go to state 4
+
+
+state 1
+
+ 3 num: '0' . [$end]
+ 4 id: '0' . [$end]
+
+ $end reduce using rule 3 (num)
+ $end [reduce using rule 4 (id)]
+ $default reduce using rule 3 (num)
+
+
+state 2
+
+ 0 $accept: exp . $end
+
+ $end shift, and go to state 5
+
+
+state 3
+
+ 1 exp: num .
+
+ $default reduce using rule 1 (exp)
+
+
+state 4
+
+ 2 exp: id .
+
+ $default reduce using rule 2 (exp)
+
+
+state 5
+
+ 0 $accept: exp $end .
+
+ $default accept
]])
AT_CLEANUP
exp: exp OP exp | NUM;
]])
-AT_CHECK([bison input.y -o input.c], 1, [],
-[input.y contains 1 shift/reduce conflict.
-expected 0 shift/reduce conflicts
+AT_CHECK([bison -o input.c input.y], 1, [],
+[input.y: conflicts: 1 shift/reduce
+input.y: expected 0 shift/reduce conflicts
])
AT_CLEANUP
exp: exp OP exp | NUM;
]])
-AT_CHECK([bison input.y -o input.c], 0)
+AT_CHECK([bison -o input.c input.y])
AT_CLEANUP
exp: exp OP exp | NUM;
]])
-AT_CHECK([bison input.y -o input.c], 1, [],
-[input.y contains 1 shift/reduce conflict.
-expected 2 shift/reduce conflicts
+AT_CHECK([bison -o input.c input.y], 1, [],
+[input.y: conflicts: 1 shift/reduce
+input.y: expected 2 shift/reduce conflicts
])
AT_CLEANUP
+
+
+## ------------------------------ ##
+## %expect with reduce conflicts ##
+## ------------------------------ ##
+
+AT_SETUP([%expect with reduce conflicts])
+
+AT_DATA([input.y],
+[[%expect 0
+%%
+program: a 'a' | a a;
+a: 'a';
+]])
+
+AT_CHECK([bison -o input.c input.y], 1, [],
+[input.y: conflicts: 1 reduce/reduce
+input.y: expected 0 reduce/reduce conflicts
+])
+AT_CLEANUP
+
+
+## ------------------------------- ##
+## %no-default-prec without %prec ##
+## ------------------------------- ##
+
+AT_SETUP([%no-default-prec without %prec])
+
+AT_DATA([[input.y]],
+[[%left '+'
+%left '*'
+
+%%
+
+%no-default-prec;
+
+e: e '+' e
+ | e '*' e
+ | '0'
+ ;
+]])
+
+AT_CHECK([bison -o input.c input.y], 0, [],
+[[input.y: conflicts: 4 shift/reduce
+]])
+AT_CLEANUP
+
+
+## ---------------------------- ##
+## %no-default-prec with %prec ##
+## ---------------------------- ##
+
+AT_SETUP([%no-default-prec with %prec])
+
+AT_DATA([[input.y]],
+[[%left '+'
+%left '*'
+
+%%
+
+%no-default-prec;
+
+e: e '+' e %prec '+'
+ | e '*' e %prec '*'
+ | '0'
+ ;
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_CLEANUP
+
+
+## ---------------- ##
+## %default-prec ##
+## ---------------- ##
+
+AT_SETUP([%default-prec])
+
+AT_DATA([[input.y]],
+[[%left '+'
+%left '*'
+
+%%
+
+%default-prec;
+
+e: e '+' e
+ | e '*' e
+ | '0'
+ ;
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_CLEANUP
projects / bison.git / blobdiff