# Executing Actions. -*- Autotest -*-
-# Copyright (C) 2001, 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
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
+# Copyright (C) 2001-2012 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 <http://www.gnu.org/licenses/>.
AT_BANNER([[User Actions.]])
# instead of being attached to the empty rule dedicated to this
# action.
+AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([[input.y]],
-[[%{
-# include <stdio.h>
-# include <stdlib.h>
- static void yyerror (const char *msg);
- static int yylex (void);
-# define YYDEBUG 1
-# define YYERROR_VERBOSE 1
+[[%error-verbose
+%debug
+%{
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
%}
%%
exp: { putchar ('0'); }
{ putchar ('\n'); }
;
%%
-static int
-yylex (void)
-{
- static const char *input = "123456789";
- return *input++;
-}
-
-static void
-yyerror (const char *msg)
-{
- fprintf (stderr, "%s\n", msg);
-}
-
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["123456789"])[
int
main (void)
{
return yyparse ();
}
]])
+AT_BISON_OPTION_POPDEFS
-AT_CHECK([bison -d -v -o input.c input.y])
+AT_BISON_CHECK([-d -v -o input.c input.y])
AT_COMPILE([input])
AT_PARSER_CHECK([./input], 0,
[[0123456789
AT_SETUP([Exotic Dollars])
+AT_BISON_OPTION_PUSHDEFS
AT_DATA_GRAMMAR([[input.y]],
-[[%{
-# include <stdio.h>
-# include <stdlib.h>
- static void yyerror (const char *msg);
- static int yylex (void);
-# define YYDEBUG 1
-# define YYERROR_VERBOSE 1
+[[%error-verbose
+%debug
+%{
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(Var)
%}
%union
exp: a_1 a_2 { $<val>$ = 3; } { $<val>$ = $<val>3 + 1; } a_5
sum_of_the_five_previous_values
{
+ USE (($1, $2, $<foo>3, $<foo>4, $5));
printf ("%d\n", $6);
}
;
;
%%
-static int
-yylex (void)
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+int
+main (void)
{
- return EOF;
+ return yyparse ();
}
+]])
-static void
-yyerror (const char *msg)
-{
- fprintf (stderr, "%s\n", msg);
-}
+AT_BISON_CHECK([-d -v -o input.c input.y], 0)
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 0,
+[[15
+]])
+
+# Make sure that fields after $n or $-n are parsed correctly. At one
+# point while implementing dashes in symbol names, we were dropping
+# fields after $-n.
+AT_DATA_GRAMMAR([[input.y]],
+[[
+%{
+#include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+ typedef struct { int val; } stype;
+# define YYSTYPE stype
+%}
+
+%%
+start: one two { $$.val = $1.val + $2.val; } sum ;
+one: { $$.val = 1; } ;
+two: { $$.val = 2; } ;
+sum: { printf ("%d\n", $0.val + $-1.val + $-2.val); } ;
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
int
main (void)
{
}
]])
-AT_CHECK([bison -d -v -o input.c input.y])
-AT_COMPILE([input])
-AT_PARSER_CHECK([./input], 0,
-[[15
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]],
+[[6
]])
+AT_BISON_OPTION_POPDEFS
AT_CLEANUP
## Printers and Destructors. ##
## -------------------------- ##
-# _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4, BISON-DIRECTIVE, UNION-FLAG)
-# -----------------------------------------------------------------------------
+# _AT_CHECK_PRINTER_AND_DESTRUCTOR($1, $2, $3, $4,
+# BISON-DIRECTIVE, UNION-FLAG)
+# -------------------------------------------------------------
m4_define([_AT_CHECK_PRINTER_AND_DESTRUCTOR],
[# Make sure complex $n work.
-m4_if([$1$2$3], $[1]$[2]$[3], [],
+m4_if([$1$2$3$4], $[1]$[2]$[3]$[4], [],
[m4_fatal([$0: Invalid arguments: $@])])dnl
# Be sure to pass all the %directives to this macro to have correct
# helping macros. So don't put any directly in the Bison file.
AT_BISON_OPTION_PUSHDEFS([$5])
AT_DATA_GRAMMAR([[input.y]],
-[[%{
+[[%code requires {
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <assert.h>
#define YYINITDEPTH 10
#define YYMAXDEPTH 10
-]AT_LALR1_CC_IF(
- [#define RANGE(Location) (Location).begin.line, (Location).end.line],
- [#define RANGE(Location) (Location).first_line, (Location).last_line])
-[%}
+#define RANGE(Location) ]AT_LALR1_CC_IF([(Location).begin.line, (Location).end.line],
+ [(Location).first_line, (Location).last_line])[
-$5]
-m4_ifval([$6], [%union
+/* Display the symbol type Symbol. */
+#define V(Symbol, Value, Location, Sep) \
+ fprintf (stderr, #Symbol " (%d@%d-%d)" Sep, Value, RANGE(Location))
+}
+
+$5
+]m4_ifval([$6], [%union
{
int ival;
}])
-AT_LALR1_CC_IF([%define "global_tokens_and_yystype"])
-[
-%{
-]AT_LALR1_CC_IF([typedef yy::location YYLTYPE;
- m4_ifval([$6], , [#define YYSTYPE int])])
-[static int yylex (]AT_LEX_FORMALS[);
-]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
-[%}
+AT_LALR1_CC_IF([%define global_tokens_and_yystype])
+m4_ifval([$6], [[%code provides {]], [[%code {]])
+AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])[
+]AT_YYLEX_DECLARE[
+]AT_LALR1_CC_IF([], [AT_YYERROR_DECLARE])
+[}
-]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input])[
+]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
+/* FIXME: This %printer isn't actually tested. */
%printer
{
]AT_LALR1_CC_IF([debug_stream () << $$;],
input line thing 'x' 'y'
%destructor
- { printf ("Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
+ { fprintf (stderr, "Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
input
%destructor
- { printf ("Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
+ { fprintf (stderr, "Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
line
%destructor
- { printf ("Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
+ { fprintf (stderr, "Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
thing
%destructor
- { printf ("Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
+ { fprintf (stderr, "Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
'x'
%destructor
- { printf ("Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
+ { fprintf (stderr, "Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
'y'
+%token END 0
+%destructor
+ { fprintf (stderr, "Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
+ END
+
%%
/*
This grammar is made to exercise error recovery.
/* Nothing. */
{
$$ = 0;
- printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
+ V(input, $$, @$, ": /* Nothing */\n");
}
| line input /* Right recursive to load the stack so that popping at
- EOF can be exercised. */
+ END can be exercised. */
{
$$ = 2;
- printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));
+ V(input, $$, @$, ": ");
+ V(line, $1, @1, " ");
+ V(input, $2, @2, "\n");
}
;
thing thing thing ';'
{
$$ = $1;
- printf ("line (%d@%d-%d): thing (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ';' (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
- $3, RANGE (@3), $4, RANGE (@4));
+ V(line, $$, @$, ": ");
+ V(thing, $1, @1, " ");
+ V(thing, $2, @2, " ");
+ V(thing, $3, @3, " ");
+ V(;, $4, @4, "\n");
}
| '(' thing thing ')'
{
$$ = $1;
- printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
- $3, RANGE (@3), $4, RANGE (@4));
+ V(line, $$, @$, ": ");
+ V('(', $1, @1, " ");
+ V(thing, $2, @2, " ");
+ V(thing, $3, @3, " ");
+ V(')', $4, @4, "\n");
}
| '(' thing ')'
{
$$ = $1;
- printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2), $3, RANGE (@3));
+ V(line, $$, @$, ": ");
+ V('(', $1, @1, " ");
+ V(thing, $2, @2, " ");
+ V(')', $3, @3, "\n");
}
| '(' error ')'
{
$$ = -1;
- printf ("line (%d@%d-%d): '(' (%d@%d-%d) error (@%d-%d) ')' (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1), RANGE (@2), $3, RANGE (@3));
+ V(line, $$, @$, ": ");
+ V('(', $1, @1, " ");
+ fprintf (stderr, "error (@%d-%d) ", RANGE(@2));
+ V(')', $3, @3, "\n");
}
;
'x'
{
$$ = $1;
- printf ("thing (%d@%d-%d): 'x' (%d@%d-%d)\n",
- $$, RANGE (@$), $1, RANGE (@1));
+ V(thing, $$, @$, ": ");
+ V('x', $1, @1, "\n");
}
;
%%
/* Alias to ARGV[1]. */
-const char *source = 0;
+const char *source = YY_NULL;
-static int
-yylex (]AT_LEX_FORMALS[)
+]AT_YYERROR_DEFINE[
+
+static
+]AT_YYLEX_PROTOTYPE[
{
static unsigned int counter = 0;
int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
/* As in BASIC, line numbers go from 10 to 10. */
-]AT_LALR1_CC_IF(
-[ AT_LOC.begin.line = AT_LOC.begin.column = 10 * c;
- AT_LOC.end.line = AT_LOC.end.column = AT_LOC.begin.line + 9;
-],
-[ AT_LOC.first_line = AT_LOC.first_column = 10 * c;
- AT_LOC.last_line = AT_LOC.last_column = AT_LOC.first_line + 9;
-])[
-
+ ]AT_LOC_FIRST_LINE[ = ]AT_LOC_FIRST_COLUMN[ = 10 * c;
+ ]AT_LOC_LAST_LINE[ = ]AT_LOC_LAST_COLUMN[ = ]AT_LOC_FIRST_LINE[ + 9;
+ assert (0 <= c && c <= strlen (source));
if (source[c])
- printf ("sending: '%c'", source[c]);
+ fprintf (stderr, "sending: '%c'", source[c]);
else
- printf ("sending: EOF");
- printf (" (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
+ fprintf (stderr, "sending: END");
+ fprintf (stderr, " (%d@%d-%d)\n", c, RANGE (]AT_LOC[));
return source[c];
}
-
]AT_LALR1_CC_IF(
-[/* A C++ error reporting function. */
-void
-yy::parser::error (const location& l, const std::string& m)
-{
- printf ("%d-%d: %s\n", RANGE (l), m.c_str());
-}
-
-static bool yydebug;
+[static bool yydebug;
int
yyparse ()
{
parser.set_debug_level (yydebug);
return parser.parse ();
}
-],
-[static void
-yyerror (const char *msg)
-{
- printf ("%d-%d: %s\n", RANGE (yylloc), msg);
-}])[
+])[
int
main (int argc, const char *argv[])
status = yyparse ();
switch (status)
{
- case 0: printf ("Successful parse.\n"); break;
- case 1: printf ("Parsing FAILED.\n"); break;
- default: printf ("Parsing FAILED (status %d).\n", status); break;
+ case 0: fprintf (stderr, "Successful parse.\n"); break;
+ case 1: fprintf (stderr, "Parsing FAILED.\n"); break;
+ default: fprintf (stderr, "Parsing FAILED (status %d).\n", status); break;
}
return status;
}
]])
-AT_LALR1_CC_IF(
- [AT_CHECK([bison -o input.cc input.y])
- AT_COMPILE_CXX([input])],
- [AT_CHECK([bison -o input.c input.y])
- AT_COMPILE([input])])
+AT_FULL_COMPILE([input])
# Check the location of "empty"
# I.e., epsilon-reductions, as in "(x)" which ends by reducing
# an empty "line" nterm.
# FIXME: This location is not satisfying. Depend on the lookahead?
-AT_PARSER_CHECK([./input '(x)'], 0,
+AT_PARSER_CHECK([./input '(x)'], 0, [],
[[sending: '(' (0@0-9)
sending: 'x' (1@10-19)
thing (1@10-19): 'x' (1@10-19)
sending: ')' (2@20-29)
line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
-sending: EOF (3@30-39)
+sending: END (3@30-39)
input (0@29-29): /* Nothing */
input (2@0-29): line (0@0-29) input (0@29-29)
+Freeing token END (3@30-39)
Freeing nterm input (2@0-29)
Successful parse.
]])
# ---------------------------------
# '(y)' is an error, but can be recovered from. But what's the location
# of the error itself ('y'), and of the resulting reduction ('(error)').
-AT_PARSER_CHECK([./input '(y)'], 0,
+AT_PARSER_CHECK([./input '(y)'], 0, [],
[[sending: '(' (0@0-9)
sending: 'y' (1@10-19)
-10-19: syntax error, unexpected 'y', expecting 'x'
+10.10-19.18: syntax error, unexpected 'y', expecting 'x'
Freeing token 'y' (1@10-19)
sending: ')' (2@20-29)
line (-1@0-29): '(' (0@0-9) error (@10-19) ')' (2@20-29)
-sending: EOF (3@30-39)
+sending: END (3@30-39)
input (0@29-29): /* Nothing */
input (2@0-29): line (-1@0-29) input (0@29-29)
+Freeing token END (3@30-39)
Freeing nterm input (2@0-29)
Successful parse.
]])
# '(', 'x', ')',
# '(', 'x', ')',
# 'y'
-AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1,
+AT_PARSER_CHECK([./input '(xxxxx)(x)(x)y'], 1, [],
[[sending: '(' (0@0-9)
sending: 'x' (1@10-19)
thing (1@10-19): 'x' (1@10-19)
sending: 'x' (2@20-29)
thing (2@20-29): 'x' (2@20-29)
sending: 'x' (3@30-39)
-30-39: syntax error, unexpected 'x', expecting ')'
+30.30-39.38: syntax error, unexpected 'x', expecting ')'
Freeing nterm thing (2@20-29)
Freeing nterm thing (1@10-19)
Freeing token 'x' (3@30-39)
input (2@100-129): line (10@100-129) input (0@129-129)
input (2@70-129): line (7@70-99) input (2@100-129)
input (2@0-129): line (-1@0-69) input (2@70-129)
-130-139: syntax error, unexpected 'y', expecting $end
+130.130-139.138: syntax error, unexpected 'y', expecting END
Freeing nterm input (2@0-129)
Freeing token 'y' (13@130-139)
Parsing FAILED.
]])
+
+# Syntax error caught by the parser where lookahead = END
+# --------------------------------------------------------
+# Load the stack and provoke an error that cannot be caught by the
+# grammar, to check that the stack is cleared. And make sure the
+# lookahead is freed.
+#
+# '(', 'x', ')',
+# '(', 'x', ')',
+# 'x'
+AT_PARSER_CHECK([./input '(x)(x)x'], 1, [],
+[[sending: '(' (0@0-9)
+sending: 'x' (1@10-19)
+thing (1@10-19): 'x' (1@10-19)
+sending: ')' (2@20-29)
+line (0@0-29): '(' (0@0-9) thing (1@10-19) ')' (2@20-29)
+sending: '(' (3@30-39)
+sending: 'x' (4@40-49)
+thing (4@40-49): 'x' (4@40-49)
+sending: ')' (5@50-59)
+line (3@30-59): '(' (3@30-39) thing (4@40-49) ')' (5@50-59)
+sending: 'x' (6@60-69)
+thing (6@60-69): 'x' (6@60-69)
+sending: END (7@70-79)
+70.70-79.78: syntax error, unexpected END, expecting 'x'
+Freeing nterm thing (6@60-69)
+Freeing nterm line (3@30-59)
+Freeing nterm line (0@0-29)
+Freeing token END (7@70-79)
+Parsing FAILED.
+]])
+
+
# Check destruction upon stack overflow
# -------------------------------------
# Upon stack overflow, all symbols on the stack should be destroyed.
# Only check for yacc.c.
AT_YACC_IF([
-AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2,
+AT_PARSER_CHECK([./input '(x)(x)(x)(x)(x)(x)(x)'], 2, [],
[[sending: '(' (0@0-9)
sending: 'x' (1@10-19)
thing (1@10-19): 'x' (1@10-19)
sending: 'x' (19@190-199)
thing (19@190-199): 'x' (19@190-199)
sending: ')' (20@200-209)
-200-209: memory exhausted
+200.200-209.208: memory exhausted
Freeing nterm thing (19@190-199)
Freeing nterm line (15@150-179)
Freeing nterm line (12@120-149)
]])
])
-])
+AT_BISON_OPTION_POPDEFS
+])# _AT_CHECK_PRINTER_AND_DESTRUCTOR
# AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
AT_CHECK_PRINTER_AND_DESTRUCTOR([])
AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
-# These tests currently fail on a Debian GNU/Linux 3.0r2 x86 host,
-# but the 2nd test succeeds on a Solaris 9 sparc hosts (Forte 7 cc).
-# Skip them until we figure out what the problem is.
AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union])
AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
+
+
+
+## ----------------------------------------- ##
+## Default tagless %printer and %destructor. ##
+## ----------------------------------------- ##
+
+# Check that the right %printer and %destructor are called, that they're not
+# called for $end, and that $$ and @$ work correctly.
+
+AT_SETUP([Default tagless %printer and %destructor])
+AT_BISON_OPTION_PUSHDEFS([%locations])
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+%locations
+%initial-action {
+ @$.first_line = @$.last_line = 1;
+ @$.first_column = @$.last_column = 1;
+}
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYLEX_DECLARE[
+]AT_YYERROR_DECLARE[
+# define USE(SYM)
+%}
+
+%printer {
+ fprintf (yyoutput, "<*> printer should not be called.\n");
+} <*>
+
+%printer {
+ fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
+} <>
+%destructor {
+ fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
+} <>
+
+%printer {
+ fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
+} 'b' 'c'
+%destructor {
+ fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
+} 'b' 'c'
+
+%destructor {
+ fprintf (yyoutput, "<*> destructor should not be called.\n");
+} <*>
+
+%%
+
+start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["abcd"], [[yylval = res]])[
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+
+AT_BISON_CHECK([-o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,
+[[<> destructor for 'd' @ 4.
+'b'/'c' destructor for 'c' @ 3.
+'b'/'c' destructor for 'b' @ 2.
+<> destructor for 'a' @ 1.
+]],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' (1.1-1.1: <> printer for 'a' @ 1)
+Shifting token 'a' (1.1-1.1: <> printer for 'a' @ 1)
+Entering state 1
+Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
+Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
+Entering state 3
+Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
+Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
+Entering state 5
+Reading a token: Next token is token 'd' (1.4-1.4: <> printer for 'd' @ 4)
+Shifting token 'd' (1.4-1.4: <> printer for 'd' @ 4)
+Entering state 6
+Reading a token: Now at end of input.
+1.5-4: syntax error, unexpected $end, expecting 'e'
+Error: popping token 'd' (1.4-1.4: <> printer for 'd' @ 4)
+Stack now 0 1 3 5
+Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
+Stack now 0 1 3
+Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
+Stack now 0 1
+Error: popping token 'a' (1.1-1.1: <> printer for 'a' @ 1)
+Stack now 0
+Cleanup: discarding lookahead token $end (1.5-1.5: )
+Stack now 0
+]])
+
+AT_BISON_OPTION_POPDEFS
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------ ##
+## Default tagged and per-type %printer and %destructor. ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default tagged and per-type %printer and %destructor])
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+%}
+
+%printer {
+ fprintf (yyoutput, "<> printer should not be called.\n");
+} <>
+
+%union { int field0; int field1; int field2; }
+%type <field0> start 'a' 'g'
+%type <field1> 'e'
+%type <field2> 'f'
+%printer {
+ fprintf (yyoutput, "<*>/<field2>/e printer");
+} <*> 'e' <field2>
+%destructor {
+ fprintf (stdout, "<*>/<field2>/e destructor.\n");
+} <*> 'e' <field2>
+
+%type <field1> 'b'
+%printer { fprintf (yyoutput, "<field1> printer"); } <field1>
+%destructor { fprintf (stdout, "<field1> destructor.\n"); } <field1>
+
+%type <field0> 'c'
+%printer { fprintf (yyoutput, "'c' printer"); } 'c'
+%destructor { fprintf (stdout, "'c' destructor.\n"); } 'c'
+
+%type <field1> 'd'
+%printer { fprintf (yyoutput, "'d' printer"); } 'd'
+%destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
+
+%destructor {
+ fprintf (yyoutput, "<> destructor should not be called.\n");
+} <>
+
+%%
+
+start:
+ 'a' 'b' 'c' 'd' 'e' 'f' 'g'
+ {
+ USE(($1, $2, $3, $4, $5, $6, $7));
+ $$ = 'S';
+ }
+ ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["abcdef"])[
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+
+AT_BISON_CHECK([-o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,
+[[<*>/<field2>/e destructor.
+<*>/<field2>/e destructor.
+'d' destructor.
+'c' destructor.
+<field1> destructor.
+<*>/<field2>/e destructor.
+]],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
+Shifting token 'a' (<*>/<field2>/e printer)
+Entering state 1
+Reading a token: Next token is token 'b' (<field1> printer)
+Shifting token 'b' (<field1> printer)
+Entering state 3
+Reading a token: Next token is token 'c' ('c' printer)
+Shifting token 'c' ('c' printer)
+Entering state 5
+Reading a token: Next token is token 'd' ('d' printer)
+Shifting token 'd' ('d' printer)
+Entering state 6
+Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
+Shifting token 'e' (<*>/<field2>/e printer)
+Entering state 7
+Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
+Shifting token 'f' (<*>/<field2>/e printer)
+Entering state 8
+Reading a token: Now at end of input.
+syntax error, unexpected $end, expecting 'g'
+Error: popping token 'f' (<*>/<field2>/e printer)
+Stack now 0 1 3 5 6 7
+Error: popping token 'e' (<*>/<field2>/e printer)
+Stack now 0 1 3 5 6
+Error: popping token 'd' ('d' printer)
+Stack now 0 1 3 5
+Error: popping token 'c' ('c' printer)
+Stack now 0 1 3
+Error: popping token 'b' (<field1> printer)
+Stack now 0 1
+Error: popping token 'a' (<*>/<field2>/e printer)
+Stack now 0
+Cleanup: discarding lookahead token $end ()
+Stack now 0
+]])
+
+AT_BISON_OPTION_POPDEFS
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------------- ##
+## Default %printer and %destructor for user-defined end token. ##
+## ------------------------------------------------------------- ##
+
+AT_SETUP([Default %printer and %destructor for user-defined end token])
+
+# _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(TYPED)
+# -------------------------------------------------------------
+m4_define([_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN],
+[m4_if($1, 0,
+ [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
+ [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
+
+AT_BISON_OPTION_PUSHDEFS([%locations])
+AT_DATA_GRAMMAR([[input]]$1[[.y]],
+[[%error-verbose
+%debug
+%locations
+%initial-action {
+ @$.first_line = @$.last_line = 1;
+ @$.first_column = @$.last_column = 1;
+}
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+%}
+
+%destructor {
+ fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
+} <]]not_kind[[>
+
+%token END 0
+%printer {
+ fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
+} <]]kind[[>
+%destructor {
+ fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
+} <]]kind[[>
+
+%printer {
+ fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
+} <]]not_kind[[>
+
+]]m4_if($1, 0, [[[
+]]],
+[[[%union { char tag; }
+%type <tag> start END]]])[[
+
+%%
+
+start: { $$ = 'S'; } ;
+
+%%
+
+static int
+yylex (void)
+{
+ static int called;
+ if (called++)
+ abort ();
+ yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';
+ yylloc.first_line = yylloc.last_line = 1;
+ yylloc.first_column = yylloc.last_column = 1;
+ return 0;
+}
+]AT_YYERROR_DEFINE[
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input$1.c input$1.y])
+AT_COMPILE([input$1])
+AT_PARSER_CHECK([./input$1], 0,
+[[<]]kind[[> for 'E' @ 1.
+<]]kind[[> for 'S' @ 1.
+]],
+[[Starting parse
+Entering state 0
+Reducing stack by rule 1 (line 46):
+-> $$ = nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
+Stack now 0
+Entering state 1
+Reading a token: Now at end of input.
+Shifting token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
+Entering state 2
+Stack now 0 1 2
+Cleanup: popping token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
+Cleanup: popping nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)
+]])
+
+m4_popdef([kind])
+m4_popdef([not_kind])
+])
+
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(0)
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(1)
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------------------ ##
+## Default %printer and %destructor are not for error or $undefined. ##
+## ------------------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor are not for error or $undefined])
+
+# If Bison were to apply the default %printer and %destructor to the error
+# token or to $undefined:
+# - For the error token:
+# - It would generate warnings for unused $n.
+# - It would invoke the %printer and %destructor on the error token's
+# semantic value, which would be initialized from the lookahead, which
+# would be destroyed separately.
+# - For $undefined, who knows what the semantic value would be.
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+%}
+
+%printer {
+ fprintf (yyoutput, "'%c'", $$);
+} <> <*>
+%destructor {
+ fprintf (stderr, "DESTROY '%c'\n", $$);
+} <> <*>
+
+%%
+
+start:
+ { $$ = 'S'; }
+ /* In order to reveal the problems that this bug caused during parsing, add
+ * $2 to USE. */
+ | 'a' error 'b' 'c' { USE(($1, $3, $4)); $$ = 'S'; }
+ ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["abd"], [yylval = res])[
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], [1], [],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' ('a')
+Shifting token 'a' ('a')
+Entering state 1
+Reading a token: Next token is token 'b' ('b')
+syntax error
+Shifting token error ()
+Entering state 3
+Next token is token 'b' ('b')
+Shifting token 'b' ('b')
+Entering state 5
+Reading a token: Next token is token $undefined ()
+Error: popping token 'b' ('b')
+DESTROY 'b'
+Stack now 0 1 3
+Error: popping token error ()
+Stack now 0 1
+Shifting token error ()
+Entering state 3
+Next token is token $undefined ()
+Error: discarding token $undefined ()
+Error: popping token error ()
+Stack now 0 1
+Shifting token error ()
+Entering state 3
+Reading a token: Now at end of input.
+Cleanup: discarding lookahead token $end ()
+Stack now 0 1 3
+Cleanup: popping token error ()
+Cleanup: popping token 'a' ('a')
+DESTROY 'a'
+]])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------ ##
+## Default %printer and %destructor are not for $accept. ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor are not for $accept])
+
+# If YYSTYPE is a union and Bison were to apply the default %printer and
+# %destructor to $accept:
+# - The %printer and %destructor code generated for $accept would always be
+# dead code because $accept is currently never shifted onto the stack.
+# - $$ for $accept would always be of type YYSTYPE because it's not possible
+# to declare `%type <field> $accept'. (Also true for $undefined.)
+# - Thus, the compiler might complain that the user code assumes the wrong
+# type for $$ since the code might assume the type associated with a
+# specific union field, which is especially reasonable in C++ since that
+# type may be a base type. This test case checks for this problem. (Also
+# true for $undefined and the error token, so there are three warnings for
+# %printer and three for %destructor.)
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug /* So that %printer is actually compiled. */
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+%}
+
+%printer {
+ char chr = $$;
+ fprintf (yyoutput, "'%c'", chr);
+} <> <*>
+%destructor {
+ char chr = $$;
+ fprintf (stderr, "DESTROY '%c'\n", chr);
+} <> <*>
+
+%union { char chr; }
+%type <chr> start
+
+%%
+
+start: { USE($$); } ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+int
+main (void)
+{
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input.c input.y])
+AT_COMPILE([input])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------ ##
+## Default %printer and %destructor for mid-rule values. ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor for mid-rule values])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug /* So that %printer is actually compiled. */
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+# define USE(SYM)
+# define YYLTYPE int
+# define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs)
+# define YY_LOCATION_PRINT(File, Loc)
+%}
+
+%printer { fprintf (yyoutput, "%d", @$); } <>
+%destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
+%printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
+%destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
+
+%%
+
+start:
+ { @$ = 1; } // Not set or used.
+ { USE ($$); @$ = 2; } // Both set and used.
+ { USE ($$); @$ = 3; } // Only set.
+ { @$ = 4; } // Only used.
+ 'c'
+ { USE (($$, $2, $4, $5)); @$ = 0; }
+ ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([-o input.c input.y], 0,,
+[[input.y:33.3-23: warning: unset value: $$
+input.y:30.3-35.37: warning: unused value: $3
+]])
+
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,,
+[[Starting parse
+Entering state 0
+Reducing stack by rule 1 (line 30):
+-> $$ = nterm $@1 (: )
+Stack now 0
+Entering state 2
+Reducing stack by rule 2 (line 31):
+-> $$ = nterm @2 (: 2)
+Stack now 0 2
+Entering state 4
+Reducing stack by rule 3 (line 32):
+-> $$ = nterm @3 (: 3)
+Stack now 0 2 4
+Entering state 5
+Reducing stack by rule 4 (line 33):
+-> $$ = nterm @4 (: 4)
+Stack now 0 2 4 5
+Entering state 6
+Reading a token: Now at end of input.
+syntax error
+Error: popping nterm @4 (: 4)
+DESTROY 4
+Stack now 0 2 4 5
+Error: popping nterm @3 (: 3)
+DESTROY 3
+Stack now 0 2 4
+Error: popping nterm @2 (: 2)
+DESTROY 2
+Stack now 0 2
+Error: popping nterm $@1 (: )
+Stack now 0
+Cleanup: discarding lookahead token $end (: )
+Stack now 0
+]])
+
+AT_CLEANUP
+
+
+## ----------------------- ##
+## @$ implies %locations. ##
+## ----------------------- ##
+
+# Bison once forgot to check for @$ in actions other than semantic actions.
+
+# AT_CHECK_ACTION_LOCATIONS(ACTION-DIRECTIVE)
+# -------------------------------------------
+m4_define([AT_CHECK_ACTION_LOCATIONS],
+[AT_SETUP([[@$ in ]$1[ implies %locations]])
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[%code {
+ #include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+}
+
+%debug
+
+]$1[ {
+ fprintf (stderr, "%d\n", @$.first_line);
+} ]m4_if($1, [%initial-action], [], [[start]])[
+
+%%
+
+start: ;
+
+%%
+
+static int
+yylex (void)
+{
+ return 0;
+}
+
+]AT_YYERROR_DEFINE[
+int
+main (void)
+{
+ return yyparse ();
+}
+]])
+
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_BISON_OPTION_POPDEFS
+AT_CLEANUP])
+
+AT_CHECK_ACTION_LOCATIONS([[%initial-action]])
+AT_CHECK_ACTION_LOCATIONS([[%destructor]])
+AT_CHECK_ACTION_LOCATIONS([[%printer]])
+
+
+## ----------------------------------------------- ##
+## Fix user actions without a trailing semicolon. ##
+## ----------------------------------------------- ##
+
+AT_SETUP([[Fix user actions without a trailing semicolon]])
+
+# This feature is undocumented, but we accidentally broke it in 2.3a,
+# and there was a complaint at:
+# <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA([input.y],
+[[%%
+start: test2 test1 test0 testc;
+
+test2
+: 'a' { semi; /* TEST:N:2 */ }
+| 'b' { if (0) {no_semi} /* TEST:N:2 */ }
+| 'c' { if (0) {semi;} /* TEST:N:2 */ }
+| 'd' { semi; no_semi /* TEST:Y:2 */ }
+| 'e' { semi(); no_semi() /* TEST:Y:2 */ }
+| 'f' { semi[]; no_semi[] /* TEST:Y:2 */ }
+| 'g' { semi++; no_semi++ /* TEST:Y:2 */ }
+| 'h' { {no_semi} no_semi /* TEST:Y:2 */ }
+| 'i' { {semi;} no_semi /* TEST:Y:2 */ }
+;
+test1
+ : 'a' { semi; // TEST:N:1 ;
+} | 'b' { if (0) {no_semi} // TEST:N:1 ;
+} | 'c' { if (0) {semi;} // TEST:N:1 ;
+} | 'd' { semi; no_semi // TEST:Y:1 ;
+} | 'e' { semi(); no_semi() // TEST:Y:1 ;
+} | 'f' { semi[]; no_semi[] // TEST:Y:1 ;
+} | 'g' { semi++; no_semi++ // TEST:Y:1 ;
+} | 'h' { {no_semi} no_semi // TEST:Y:1 ;
+} | 'i' { {semi;} no_semi // TEST:Y:1 ;
+} ;
+test0
+ : 'a' { semi; // TEST:N:1 {}
+} | 'b' { if (0) {no_semi} // TEST:N:1 {}
+} | 'c' { if (0) {semi;} // TEST:N:1 {}
+} | 'd' { semi; no_semi // TEST:Y:1 {}
+} | 'e' { semi(); no_semi() // TEST:Y:1 {}
+} | 'f' { semi[]; no_semi[] // TEST:Y:1 {}
+} | 'g' { semi++; no_semi++ // TEST:Y:1 {}
+} | 'h' { {no_semi} no_semi // TEST:Y:1 {}
+} | 'i' { {semi;} no_semi // TEST:Y:1 {}
+} ;
+
+testc
+: 'a' {
+#define TEST_MACRO_N \
+[]"broken\" $ @ $$ @$ [];\
+string;"}
+| 'b' {
+no_semi
+#define TEST_MACRO_N \
+[]"broken\" $ @ $$ @$ [];\
+string;"}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o input.c input.y]], [0], [],
+[[input.y:8.48: warning: a ';' might be needed at the end of action code
+input.y:8.48: warning: future versions of Bison will not add the ';'
+input.y:9.48: warning: a ';' might be needed at the end of action code
+input.y:9.48: warning: future versions of Bison will not add the ';'
+input.y:10.48: warning: a ';' might be needed at the end of action code
+input.y:10.48: warning: future versions of Bison will not add the ';'
+input.y:11.48: warning: a ';' might be needed at the end of action code
+input.y:11.48: warning: future versions of Bison will not add the ';'
+input.y:12.48: warning: a ';' might be needed at the end of action code
+input.y:12.48: warning: future versions of Bison will not add the ';'
+input.y:13.48: warning: a ';' might be needed at the end of action code
+input.y:13.48: warning: future versions of Bison will not add the ';'
+input.y:20.1: warning: a ';' might be needed at the end of action code
+input.y:20.1: warning: future versions of Bison will not add the ';'
+input.y:21.1: warning: a ';' might be needed at the end of action code
+input.y:21.1: warning: future versions of Bison will not add the ';'
+input.y:22.1: warning: a ';' might be needed at the end of action code
+input.y:22.1: warning: future versions of Bison will not add the ';'
+input.y:23.1: warning: a ';' might be needed at the end of action code
+input.y:23.1: warning: future versions of Bison will not add the ';'
+input.y:24.1: warning: a ';' might be needed at the end of action code
+input.y:24.1: warning: future versions of Bison will not add the ';'
+input.y:25.1: warning: a ';' might be needed at the end of action code
+input.y:25.1: warning: future versions of Bison will not add the ';'
+input.y:31.1: warning: a ';' might be needed at the end of action code
+input.y:31.1: warning: future versions of Bison will not add the ';'
+input.y:32.1: warning: a ';' might be needed at the end of action code
+input.y:32.1: warning: future versions of Bison will not add the ';'
+input.y:33.1: warning: a ';' might be needed at the end of action code
+input.y:33.1: warning: future versions of Bison will not add the ';'
+input.y:34.1: warning: a ';' might be needed at the end of action code
+input.y:34.1: warning: future versions of Bison will not add the ';'
+input.y:35.1: warning: a ';' might be needed at the end of action code
+input.y:35.1: warning: future versions of Bison will not add the ';'
+input.y:36.1: warning: a ';' might be needed at the end of action code
+input.y:36.1: warning: future versions of Bison will not add the ';'
+]])
+
+AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]], [[3]])
+AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]], [[6]])
+AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]], [[6]])
+AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]], [[12]])
+AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
+
+AT_CLEANUP
+
+
+## -------------------------------------------------- ##
+## Destroying lookahead assigned by semantic action. ##
+## -------------------------------------------------- ##
+
+AT_SETUP([[Destroying lookahead assigned by semantic action]])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([input.y],
+[[
+%code {
+ #include <assert.h>
+ #include <stdio.h>
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+ #define USE(Var)
+}
+
+%destructor { fprintf (stderr, "'a' destructor\n"); } 'a'
+%destructor { fprintf (stderr, "'b' destructor\n"); } 'b'
+
+%%
+
+// In a previous version of Bison, yychar assigned by the semantic
+// action below was not translated into yytoken before the lookahead was
+// discarded and thus before its destructor (selected according to
+// yytoken) was called in order to return from yyparse. This would
+// happen even if YYACCEPT was performed in a later semantic action as
+// long as only consistent states with default reductions were visited
+// in between. However, we leave YYACCEPT in the same semantic action
+// for this test in order to show that skeletons cannot simply translate
+// immediately after every semantic action because a semantic action
+// that has set yychar might not always return normally. Instead,
+// skeletons must translate before every use of yytoken.
+start: 'a' accept { USE($1); } ;
+accept: /*empty*/ {
+ assert (yychar == YYEMPTY);
+ yychar = 'b';
+ YYACCEPT;
+} ;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["a"])[
+int
+main (void)
+{
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]], [],
+[['b' destructor
+'a' destructor
+]])
+
+AT_CLEANUP
+
+## ---------- ##
+## YYBACKUP. ##
+## ---------- ##
+
+AT_SETUP([[YYBACKUP]])
+
+AT_BISON_OPTION_PUSHDEFS([%pure-parser])
+
+AT_DATA_GRAMMAR([input.y],
+[[
+%error-verbose
+%debug
+%pure-parser
+%code {
+# include <stdio.h>
+# include <stdlib.h>
+# include <assert.h>
+
+ ]AT_YYERROR_DECLARE[
+ ]AT_YYLEX_DECLARE[
+}
+%%
+input:
+ exp exp {}
+;
+
+exp:
+ 'a' { printf ("a: %d\n", $1); }
+| 'b' { YYBACKUP('a', 123); }
+| 'c' 'd' { YYBACKUP('a', 456); }
+;
+
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE(["bcd"], [*lvalp = (toknum + 1) * 10])[
+
+int
+main (void)
+{
+ yydebug = !!getenv("YYDEBUG");
+ return yyparse ();
+}
+]])
+AT_BISON_OPTION_POPDEFS
+
+AT_BISON_CHECK([[-o input.c input.y]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input]], [[0]],
+[[a: 123
+a: 456
+]])
+
+AT_CLEANUP
projects / bison.git / blobdiff