Don't let %prec take a nonterminal.

[bison.git] / tests / input.at

# Checking the Bison scanner.                    -*- Autotest -*-
# Copyright (C) 2002, 2003, 2004, 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.

# 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.

AT_BANNER([[Input Processing.]])

# Mostly test that we are robust to mistakes.


## ------------ ##
## Invalid $n.  ##
## ------------ ##

AT_SETUP([Invalid \$n and @n])

AT_DATA([input.y],
[[%%
exp: { $$ = $1 ; };
exp: { @$ = @1 ; };
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:2.13-14: integer out of range: `$1'
input.y:3.13-14: integer out of range: `@1'
]])

AT_CLEANUP


## -------------- ##
## Type Clashes.  ##
## -------------- ##

AT_SETUP([Type Clashes])

AT_DATA([input.y],
[[%union { int bar; }
%token foo
%type <bar> exp
%%
exp: foo { $$; } foo { $2; } foo
   | foo
   | /* Empty. */
   ;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:5.12-13: $$ for the midrule at $2 of `exp' has no declared type
input.y:5.24-25: $2 of `exp' has no declared type
input.y:5.6-32: warning: type clash on default action: <bar> != <>
input.y:6.6-8: warning: type clash on default action: <bar> != <>
input.y:7.5: warning: empty rule for typed nonterminal, and no action
]])

AT_CLEANUP


# _AT_UNUSED_VALUES_DECLARATIONS()
# --------------------------------------------
# Generate the token, type, and destructor
# declarations for the unused values tests.

m4_define([_AT_UNUSED_VALUES_DECLARATIONS],
[[[%token <integer> INT;
%type <integer> a b c d e f g h i j k l;
%destructor { destroy ($$); } INT a b c d e f g h i j k l;]]])


# AT_CHECK_UNUSED_VALUES(DECLARATIONS_AFTER, CHECK_MIDRULE_VALUES)
# ------------------------------------------------------------------
# Generate a grammar to test unused values,
# compile it, run it.  If DECLARATIONS_AFTER
# is set, then the token, type, and destructor
# declarations are generated after the rules
# rather than before.  If CHECK_MIDRULE_VALUES
# is set, then --warnings=midrule-values is
# set.

m4_define([AT_CHECK_UNUSED_VALUES],
[AT_DATA([input.y],
m4_ifval($1, [


], [_AT_UNUSED_VALUES_DECLARATIONS
])[[%%
start:
  'a' a { $]2[ } | 'b' b { $]2[ } | 'c' c { $]2[ } | 'd' d { $]2[ } | 'e' e { $]2[ }
| 'f' f { $]2[ } | 'g' g { $]2[ } | 'h' h { $]2[ } | 'i' i { $]2[ } | 'j' j { $]2[ }
| 'k' k { $]2[ } | 'l' l { $]2[ }
;

a: INT | INT { } INT { } INT { };
b: INT | /* empty */;
c: INT | INT { $]1[ } INT { $<integer>2 } INT { $<integer>4 };
d: INT | INT { } INT { $]1[ } INT { $<integer>2 };
e: INT | INT { } INT {  } INT { $]1[ };
f: INT | INT { } INT {  } INT { $]$[ = $]1[ + $]3[ + $]5[; };
g: INT | INT { $<integer>$; } INT { $<integer>$; } INT { };
h: INT | INT { $<integer>$; } INT { $<integer>$ = $<integer>2; } INT { };
i: INT | INT INT { } { $]$[ = $]1[ + $]2[; };
j: INT | INT INT { $<integer>$ = 1; } { $]$[ = $]1[ + $]2[; };
k: INT | INT INT { $<integer>$; } { $<integer>$ = $<integer>3; } { };
l: INT | INT { $<integer>$ = $<integer>1; } INT { $<integer>$ = $<integer>2 + $<integer>3; } INT { $<integer>$ = $<integer>4 + $<integer>5; };]]m4_ifval($1, [
_AT_UNUSED_VALUES_DECLARATIONS])
)

AT_CHECK([bison]m4_ifval($2, [ --warnings=midrule-values ])[ input.y], [0], [],
[[input.y:11.10-32: warning: unset value: $]$[
input.y:11.10-32: warning: unused value: $]1[
input.y:11.10-32: warning: unused value: $]3[
input.y:11.10-32: warning: unused value: $]5[
input.y:12.9: warning: empty rule for typed nonterminal, and no action
]]m4_ifval($2, [[[input.y:13.14-19: warning: unset value: $$
input.y:13.25-39: warning: unset value: $$
]]])[[input.y:13.10-59: warning: unset value: $]$[
input.y:13.10-59: warning: unused value: $]3[
input.y:13.10-59: warning: unused value: $]5[
]]m4_ifval($2, [[[input.y:14.14-16: warning: unset value: $$
]]])[[input.y:14.10-47: warning: unset value: $]$[
input.y:14.10-47: warning: unused value: $]3[
input.y:14.10-47: warning: unused value: $]5[
input.y:15.10-36: warning: unset value: $]$[
input.y:15.10-36: warning: unused value: $]3[
input.y:15.10-36: warning: unused value: $]5[
input.y:17.10-58: warning: unset value: $]$[
input.y:17.10-58: warning: unused value: $]1[
]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]2[
]]])[[input.y:17.10-58: warning: unused value: $]3[
]]m4_ifval($2, [[[input.y:17.10-58: warning: unused value: $]4[
]]])[[input.y:17.10-58: warning: unused value: $]5[
input.y:18.10-72: warning: unset value: $]$[
input.y:18.10-72: warning: unused value: $]1[
input.y:18.10-72: warning: unused value: $]3[
]]m4_ifval($2, [[[input.y:18.10-72: warning: unused value: $]4[
]]])[[input.y:18.10-72: warning: unused value: $]5[
]]m4_ifval($2, [[[input.y:20.10-55: warning: unused value: $]3[
]]])[[input.y:21.10-68: warning: unset value: $]$[
input.y:21.10-68: warning: unused value: $]1[
input.y:21.10-68: warning: unused value: $]2[
]]m4_ifval($2, [[[input.y:21.10-68: warning: unused value: $]4[
]]]))])


## --------------- ##
## Unused values.  ##
## --------------- ##

AT_SETUP([Unused values])
AT_CHECK_UNUSED_VALUES
AT_CHECK_UNUSED_VALUES(, [1])
AT_CLEANUP


## ------------------------------------------ ##
## Unused values before symbol declarations.  ##
## ------------------------------------------ ##

AT_SETUP([Unused values before symbol declarations])
AT_CHECK_UNUSED_VALUES([1])
AT_CHECK_UNUSED_VALUES([1], [1])
AT_CLEANUP


## --------------------------------------------- ##
## Default %printer and %destructor redeclared.  ##
## --------------------------------------------- ##

AT_SETUP([Default %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*> <*>
%printer { destroy ($$); } <*> <*>

%destructor { destroy ($$); } <*>
%printer { destroy ($$); } <*>

%destructor { destroy ($$); } <!> <!>
%printer { destroy ($$); } <!> <!>

%destructor { destroy ($$); } <!>
%printer { destroy ($$); } <!>

%%

start: ;

%destructor { destroy ($$); } <*>;
%printer { destroy ($$); } <*>;

%destructor { destroy ($$); } <!>;
%printer { destroy ($$); } <!>;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:1.13-29: redeclaration for default tagged %destructor
input.y:1.13-29: previous declaration
input.y:2.10-26: redeclaration for default tagged %printer
input.y:2.10-26: previous declaration
input.y:4.13-29: redeclaration for default tagged %destructor
input.y:1.13-29: previous declaration
input.y:5.10-26: redeclaration for default tagged %printer
input.y:2.10-26: previous declaration
input.y:7.13-29: redeclaration for default tagless %destructor
input.y:7.13-29: previous declaration
input.y:8.10-26: redeclaration for default tagless %printer
input.y:8.10-26: previous declaration
input.y:10.13-29: redeclaration for default tagless %destructor
input.y:7.13-29: previous declaration
input.y:11.10-26: redeclaration for default tagless %printer
input.y:8.10-26: previous declaration
input.y:17.13-29: redeclaration for default tagged %destructor
input.y:4.13-29: previous declaration
input.y:18.10-26: redeclaration for default tagged %printer
input.y:5.10-26: previous declaration
input.y:20.13-29: redeclaration for default tagless %destructor
input.y:10.13-29: previous declaration
input.y:21.10-26: redeclaration for default tagless %printer
input.y:11.10-26: previous declaration
]])

AT_CLEANUP


## ---------------------------------------------- ##
## Per-type %printer and %destructor redeclared.  ##
## ---------------------------------------------- ##

AT_SETUP([Per-type %printer and %destructor redeclared])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1> <field2>
%printer { destroy ($$); } <field1> <field2>

%destructor { destroy ($$); } <field1> <field1>
%printer { destroy ($$); } <field2> <field2>

%%

start: ;

%destructor { destroy ($$); } <field2> <field1>;
%printer { destroy ($$); } <field2> <field1>;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:4.13-29: %destructor redeclaration for <field1>
input.y:1.13-29: previous declaration
input.y:4.13-29: %destructor redeclaration for <field1>
input.y:4.13-29: previous declaration
input.y:5.10-26: %printer redeclaration for <field2>
input.y:2.10-26: previous declaration
input.y:5.10-26: %printer redeclaration for <field2>
input.y:5.10-26: previous declaration
input.y:11.13-29: %destructor redeclaration for <field1>
input.y:4.13-29: previous declaration
input.y:11.13-29: %destructor redeclaration for <field2>
input.y:1.13-29: previous declaration
input.y:12.10-26: %printer redeclaration for <field1>
input.y:2.10-26: previous declaration
input.y:12.10-26: %printer redeclaration for <field2>
input.y:5.10-26: previous declaration
]])

AT_CLEANUP


## ---------------------------------------- ##
## Unused values with default %destructor.  ##
## ---------------------------------------- ##

AT_SETUP([Unused values with default %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <!>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_CHECK([bison input.y], [0], [],
[[input.y:6.8-45: warning: unset value: $$
input.y:6.8-45: warning: unused value: $2
input.y:7.6-8: warning: unset value: $$
]])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <*>
%type <tag> tagged

%%

start: end end tagged tagged { $<tag>1; $3; } ;
end: { } ;
tagged: { } ;
]])

AT_CHECK([bison input.y], [0], [],
[[input.y:6.8-45: warning: unused value: $4
input.y:8.9-11: warning: unset value: $$
]])

AT_CLEANUP


## ----------------------------------------- ##
## Unused values with per-type %destructor.  ##
## ----------------------------------------- ##

AT_SETUP([Unused values with per-type %destructor])

AT_DATA([[input.y]],
[[%destructor { destroy ($$); } <field1>
%type <field1> start end

%%

start: end end { $1; } ;
end: { }  ;
]])

AT_CHECK([bison input.y], [0], [],
[[input.y:6.8-22: warning: unset value: $$
input.y:6.8-22: warning: unused value: $2
input.y:7.6-8: warning: unset value: $$
]])

AT_CLEANUP


## ---------------------- ##
## Incompatible Aliases.  ##
## ---------------------- ##

AT_SETUP([Incompatible Aliases])

AT_DATA([input.y],
[[%token foo "foo"

%type <bar>       foo
%printer {bar}    foo
%destructor {bar} foo
%left             foo

%type <baz>       "foo"
%printer {baz}    "foo"
%destructor {baz} "foo"
%left             "foo"

%%
exp: foo;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:8.7-11: %type redeclaration for foo
input.y:3.7-11: previous declaration
input.y:10.13-17: %destructor redeclaration for foo
input.y:5.13-17: previous declaration
input.y:9.10-14: %printer redeclaration for foo
input.y:4.10-14: previous declaration
input.y:11.1-5: %left redeclaration for foo
input.y:6.1-5: previous declaration
]])

AT_CLEANUP



## ----------------------- ##
## Torturing the Scanner.  ##
## ----------------------- ##

# Be sure to compile and run, so that the C compiler checks what
# we do.

AT_SETUP([Torturing the Scanner])


AT_DATA([input.y], [])
AT_CHECK([bison input.y], [1], [],
[[input.y:1.1: syntax error, unexpected end of file
]])


AT_DATA([input.y],
[{}
])
AT_CHECK([bison input.y], [1], [],
[[input.y:1.1-2: syntax error, unexpected {...}
]])


AT_DATA_GRAMMAR([input.y],
[[%{
/* This is seen in GCC: a %{ and %} in middle of a comment. */
const char *foo = "So %{ and %} can be here too.";

#if 0
/* These examples test Bison while not stressing C compilers too much.
   Many C compilers mishandle backslash-newlines, so this part of the
   test is inside "#if 0".  The comment and string are written so that
   the "#endif" will be seen regardless of the C compiler bugs that we
   know about, namely:

     HP C (as of late 2002) mishandles *\[newline]\[newline]/ within a
     comment.

     The Apple Darwin compiler (as of late 2002) mishandles
     \\[newline]' within a character constant.

   */

/\
* A comment with backslash-newlines in it. %} *\
\
/
/* { Close the above comment, if the C compiler mishandled it.  */

char str[] = "\\
" A string with backslash-newlines in it %{ %} \\
\
"";

char apostrophe = '\'';
#endif

#include <stdio.h>
#include <stdlib.h>
%}
/* %{ and %} can be here too. */

%{
/* Exercise pre-prologue dependency to %union.  */
typedef int value;
%}

/* Exercise M4 quoting: '@:>@@:>@', 0.  */

/* Also exercise %union. */
%union
{
  value ival; /* A comment to exercise an old bug. */
};


/* Exercise post-prologue dependency to %union.  */
%{
static YYSTYPE value_as_yystype (value val);

/* Exercise quotes in declarations.  */
char quote[] = "@:>@@:>@,";
%}

%{
static void yyerror (const char *s);
static int yylex (void);
%}

%type <ival> '@<:@'

/* Exercise quotes in strings.  */
%token FAKE "fake @<:@@:>@ \a\b\f\n\r\t\v\"\'\?\\\u005B\U0000005c ??!??'??(??)??-??/??<??=??> \x1\1"

%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 1.  */
exp: '@<:@' '\1' two '$' '@' '{' oline output.or.oline.opt
  {
    /* Exercise quotes in braces.  */
    char tmp[] = "@<:@%c@:>@,\n";
    printf (tmp, $1);
  }
;

two: '\x000000000000000000000000000000000000000000000000000000000000000000002';
oline: '@' 'o' 'l' 'i' 'n' 'e' '@' '_' '_' 'o' 'l' 'i' 'n' 'e' '_' '_';
output.or.oline.opt: ;|oline;;|output;;;
output: '#' 'o' 'u' 't' 'p' 'u' 't' ' ';
%%
/* Exercise M4 quoting: '@:>@@:>@', @<:@, 2.  */

static YYSTYPE
value_as_yystype (value val)
{
  YYSTYPE res;
  res.ival = val;
  return res;
}

static int
yylex (void)
{
  static char const input[] = "@<:@\1\2$@{@oline@__@&t@oline__\
#output "; /* "
  */
  static size_t toknum;
  if (! (toknum < sizeof input))
    abort ();
  yylval = value_as_yystype (input[toknum]);
  return input[toknum++];
}

static void
yyerror (const char *msg)
{
  fprintf (stderr, "%s\n", msg);
}
]])

# Pacify Emacs'font-lock-mode: "

AT_DATA([main.c],
[[typedef int value;
#include "input.h"

int yyparse (void);

int
main (void)
{
  return yyparse ();
}
]])

AT_CHECK([bison -d -v -o input.c input.y])
AT_COMPILE([input.o], [-c input.c])
AT_COMPILE([main.o], [-c main.c])
AT_COMPILE([input], [input.o main.o])
AT_PARSER_CHECK([./input], 0,
[[[@<:@],
]])

AT_CLEANUP


## ---------------------- ##
## Typed symbol aliases.  ##
## ---------------------- ##

AT_SETUP([Typed symbol aliases])

# Bison 2.0 broke typed symbol aliases - ensure they work.

AT_DATA_GRAMMAR([input.y],
[[%union
{
  int val;
};
%token <val> MY_TOKEN "MY TOKEN"
%type <val> exp
%%
exp: "MY TOKEN";
%%
]])

AT_CHECK([bison -o input.c input.y])

AT_CLEANUP


## --------- ##
## Require.  ##
## --------- ##

m4_define([AT_CHECK_REQUIRE],
[AT_SETUP([Require $1])
AT_DATA_GRAMMAR([input.y],
[[%require "$1";
%%
empty_file:;
]])
AT_CHECK([bison -o input.c input.y], $2, [], ignore)
AT_CLEANUP
])

AT_CHECK_REQUIRE(1.0, 0)
AT_CHECK_REQUIRE(AT_PACKAGE_VERSION, 0)
## FIXME: Some day augment this version number.
AT_CHECK_REQUIRE(100.0, 63)


## ------------------------------------- ##
## String aliases for character tokens.  ##
## ------------------------------------- ##

AT_SETUP([String aliases for character tokens])

# Bison once thought a character token and its alias were different symbols
# with the same user token number.

AT_DATA_GRAMMAR([input.y],
[[%token 'a' "a"
%%
start: 'a';
%%
]])

AT_CHECK([bison -o input.c input.y])

AT_CLEANUP


## --------------------- ##
## Unclosed constructs.  ##
## --------------------- ##

AT_SETUP([Unclosed constructs])

# Bison's scan-gram.l once forgot to STRING_FINISH some unclosed constructs, so
# they were prepended to whatever it STRING_GROW'ed next.  It also threw them
# away rather than returning them to the parser.  The effect was confusing
# subsequent error messages.

AT_DATA([input.y],
[[%token A "a
%token B "b"
%token AB "ab" // Used to complain that "ab" was already used.
%token C '1
%token TWO "2"
%token TICK_TWELVE "'12" // Used to complain that "'12" was already used.

%%

start: ;

// Used to report a syntax error because it didn't see any kind of symbol
// identifier.
%type <f> 'a
;
%type <f> "a
;
// Used to report a syntax error because it didn't see braced code.
%destructor { free ($$)
]])

AT_CHECK([bison -o input.c input.y], 1, [],
[[input.y:1.10-2.0: missing `"' at end of line
input.y:4.10-5.0: missing `'' at end of line
input.y:14.11-15.0: missing `'' at end of line
input.y:16.11-17.0: missing `"' at end of line
input.y:19.13-20.0: missing `}' at end of file
input.y:20.1: syntax error, unexpected end of file
]])

AT_CLEANUP


## ------------------------- ##
## %start after first rule.  ##
## ------------------------- ##

AT_SETUP([%start after first rule])

# Bison once complained that a %start after the first rule was a redeclaration
# of the start symbol.

AT_DATA([input.y],
[[%%
false_start: ;
start: false_start ;
%start start;
]])

AT_CHECK([bison -o input.c input.y])

AT_CLEANUP


## --------------------- ##
## %prec takes a token.  ##
## --------------------- ##

AT_SETUP([%prec takes a token])

# Bison once allowed %prec sym where sym was a nonterminal.

AT_DATA([input.y],
[[%%
start: PREC %prec PREC ;
PREC: ;
]])

AT_CHECK([bison input.y], [1], [],
[[input.y:3.1-4: rule given for PREC, which is a token
]])

AT_CLEANUP