# Executing Actions. -*- Autotest -*-
-# Copyright 2001 Free Software Foundation, Inc.
+# Copyright (C) 2001, 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
# 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([[User Actions.]])
# instead of being attached to the empty rule dedicated to this
# action.
-AT_DATA([[input.y]],
-[[%{
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+%{
# include <stdio.h>
# include <stdlib.h>
static void yyerror (const char *msg);
static int yylex (void);
-# define YYDEBUG 1
-# define YYERROR_VERBOSE 1
%}
%%
exp: { putchar ('0'); }
static int
yylex (void)
{
- static const char *input = "123456789";
- return *input++;
+ static char const input[] = "123456789";
+ static size_t toknum;
+ if (! (toknum < sizeof input))
+ abort ();
+ return input[toknum++];
}
static void
+
+
## ---------------- ##
## Exotic Dollars. ##
## ---------------- ##
AT_SETUP([Exotic Dollars])
-AT_DATA([[input.y]],
-[[%{
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+%{
# include <stdio.h>
# include <stdlib.h>
static void yyerror (const char *msg);
static int yylex (void);
-# define YYDEBUG 1
-# define YYERROR_VERBOSE 1
+# 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)
{
+ static int called;
+ if (called++)
+ abort ();
return EOF;
}
}
]])
-AT_CHECK([bison -d -v -o input.c input.y])
+AT_CHECK([bison -d -v -o input.c input.y], 0)
AT_COMPILE([input])
AT_PARSER_CHECK([./input], 0,
[[15
## Printers and Destructors. ##
## -------------------------- ##
-AT_SETUP([Printers and Destructors])
+# _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_fatal([$0: Invalid arguments: $@])])dnl
-# Make sure complex $n work.
-
-AT_DATA([[input.y]],
-[[%{
+# 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]],
+[[%start-header {
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <assert.h>
-static int yylex (void);
-static void yyerror (const char *msg);
-%}
-%error-verbose
-%debug
-%verbose
-%locations
-%union
+#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])
+[}
+
+$5]
+m4_ifval([$6], [%union
{
int ival;
-}
-%type <ival> 'x' thing line input
+}])
+AT_LALR1_CC_IF([%define "global_tokens_and_yystype"])
+m4_ifval([$6], [[%end-header {]], [[%after-header {]])
+AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])
+[static int yylex (]AT_LEX_FORMALS[);
+]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
+[}
+
+]m4_ifval([$6], [%type <ival> '(' 'x' 'y' ')' ';' thing line input END])[
-%printer { fprintf (yyout, "%d from %d", $$, @$.first_line); }
- input line thing 'x'
+/* FIXME: This %printer isn't actually tested. */
+%printer
+ {
+ ]AT_LALR1_CC_IF([debug_stream () << $$;],
+ [fprintf (yyoutput, "%d", $$)])[;
+ }
+ input line thing 'x' 'y'
%destructor
- { fprintf (stdout, "Freeing nterm input (%d from %d)\n", $$, @$.first_line); }
+ { printf ("Freeing nterm input (%d@%d-%d)\n", $$, RANGE (@$)); }
input
%destructor
- { fprintf (stdout, "Freeing nterm line (%d from %d)\n", $$, @$.first_line); }
+ { printf ("Freeing nterm line (%d@%d-%d)\n", $$, RANGE (@$)); }
line
%destructor
- { fprintf (stdout, "Freeing nterm thing (%d from %d)\n", $$, @$.first_line); }
+ { printf ("Freeing nterm thing (%d@%d-%d)\n", $$, RANGE (@$)); }
thing
%destructor
- { fprintf (stdout, "Freeing token 'x' (%d from %d)\n", $$, @$.first_line); }
+ { printf ("Freeing token 'x' (%d@%d-%d)\n", $$, RANGE (@$)); }
'x'
+%destructor
+ { printf ("Freeing token 'y' (%d@%d-%d)\n", $$, RANGE (@$)); }
+ 'y'
+
+%token END 0
+%destructor
+ { printf ("Freeing token END (%d@%d-%d)\n", $$, RANGE (@$)); }
+ END
+
%%
+/*
+ This grammar is made to exercise error recovery.
+ "Lines" starting with `(' support error recovery, with
+ ')' as synchronizing token. Lines starting with 'x' can never
+ be recovered from if in error.
+*/
+
input:
/* Nothing. */
{
$$ = 0;
- printf ("input(%d): /* Nothing */';'\n", $$);
+ printf ("input (%d@%d-%d): /* Nothing */\n", $$, RANGE (@$));
}
| line input /* Right recursive to load the stack so that popping at
- EOF can be exercised. */
+ END can be exercised. */
{
$$ = 2;
- printf ("input(%d): line(%d) input(%d)';'\n", $$, $1, $2);
+ printf ("input (%d@%d-%d): line (%d@%d-%d) input (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2));
}
;
thing thing thing ';'
{
$$ = $1;
- printf ("line(%d): thing(%d) thing(%d) thing(%d) ';'\n", $$, $1, $2, $3);
+ printf ("line (%d@%d-%d): thing (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ';' (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
+ $3, RANGE (@3), $4, RANGE (@4));
}
-| thing thing ';'
+| '(' thing thing ')'
{
$$ = $1;
- printf ("line(%d): thing(%d) thing(%d) ';'\n", $$, $1, $2);
+ printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2),
+ $3, RANGE (@3), $4, RANGE (@4));
}
-| thing ';'
+| '(' thing ')'
{
$$ = $1;
- printf ("line(%d): thing(%d) ';'\n", $$, $1);
+ printf ("line (%d@%d-%d): '(' (%d@%d-%d) thing (%d@%d-%d) ')' (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1), $2, RANGE (@2), $3, RANGE (@3));
}
-| error ';'
+| '(' error ')'
{
$$ = -1;
- printf ("line(%d): error ';'\n", $$);
+ printf ("line (%d@%d-%d): '(' (%d@%d-%d) error (@%d-%d) ')' (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1), RANGE (@2), $3, RANGE (@3));
}
;
'x'
{
$$ = $1;
- printf ("thing(%d): 'x'(%d)\n", $$, $1);
+ printf ("thing (%d@%d-%d): 'x' (%d@%d-%d)\n",
+ $$, RANGE (@$), $1, RANGE (@1));
}
;
%%
+/* Alias to ARGV[1]. */
+const char *source = 0;
+
static int
-yylex (void)
+yylex (]AT_LEX_FORMALS[)
{
- static const unsigned int input[] =
- {
- /* Exericise the discarding of stack top and input until `error'
- can be reduced. */
- 'x', 'x', 'x', 'x', 'x', 'x', ';',
-
- /* Load the stack and provoke an error that cannot be caught by
- the grammar, to check that the stack is cleared. */
- 'x', 'x', ';',
- 'x', ';',
- 'y'
- };
static unsigned int counter = 0;
- if (counter < (sizeof(input) / sizeof (input[0])))
- {
- yylval.ival = counter;
- /* As in BASIC, line numbers go from 10 to 10. */
- yylloc.first_line = 10 * counter;
- printf ("sending: '%c' (value = %d, line %d)\n",
- input[counter], yylval.ival, yylloc.first_line);
- return (int) input[counter++];
- }
+ 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;
+])[
+
+ if (! (0 <= c && c <= strlen (source)))
+ abort ();
+ if (source[c])
+ printf ("sending: '%c'", source[c]);
else
+ printf ("sending: END");
+ printf (" (%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;
+int
+yyparse ()
+{
+ yy::parser parser;
+ 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[])
+{
+ int status;
+ yydebug = !!getenv ("YYDEBUG");
+ assert (argc == 2);
+ source = argv[1];
+ status = yyparse ();
+ switch (status)
{
- printf ("sending: EOF\n");
- return EOF;
+ case 0: printf ("Successful parse.\n"); break;
+ case 1: printf ("Parsing FAILED.\n"); break;
+ default: printf ("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])])
+
+
+# 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,
+[[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: 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.
+]])
+
+
+# Check locations in error recovery
+# ---------------------------------
+# '(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,
+[[sending: '(' (0@0-9)
+sending: 'y' (1@10-19)
+10-19: 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: 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.
+]])
+
+
+# Syntax errors caught by the parser
+# ----------------------------------
+# Exercise the discarding of stack top and input until `error'
+# can be reduced.
+#
+# '(', 'x', 'x', 'x', 'x', 'x', ')',
+#
+# 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', ')',
+# 'y'
+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 ')'
+Freeing nterm thing (2@20-29)
+Freeing nterm thing (1@10-19)
+Freeing token 'x' (3@30-39)
+sending: 'x' (4@40-49)
+Freeing token 'x' (4@40-49)
+sending: 'x' (5@50-59)
+Freeing token 'x' (5@50-59)
+sending: ')' (6@60-69)
+line (-1@0-69): '(' (0@0-9) error (@10-59) ')' (6@60-69)
+sending: '(' (7@70-79)
+sending: 'x' (8@80-89)
+thing (8@80-89): 'x' (8@80-89)
+sending: ')' (9@90-99)
+line (7@70-99): '(' (7@70-79) thing (8@80-89) ')' (9@90-99)
+sending: '(' (10@100-109)
+sending: 'x' (11@110-119)
+thing (11@110-119): 'x' (11@110-119)
+sending: ')' (12@120-129)
+line (10@100-129): '(' (10@100-109) thing (11@110-119) ')' (12@120-129)
+sending: 'y' (13@130-139)
+input (0@129-129): /* Nothing */
+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
+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)
+70-79: 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,
+[[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: '(' (6@60-69)
+sending: 'x' (7@70-79)
+thing (7@70-79): 'x' (7@70-79)
+sending: ')' (8@80-89)
+line (6@60-89): '(' (6@60-69) thing (7@70-79) ')' (8@80-89)
+sending: '(' (9@90-99)
+sending: 'x' (10@100-109)
+thing (10@100-109): 'x' (10@100-109)
+sending: ')' (11@110-119)
+line (9@90-119): '(' (9@90-99) thing (10@100-109) ')' (11@110-119)
+sending: '(' (12@120-129)
+sending: 'x' (13@130-139)
+thing (13@130-139): 'x' (13@130-139)
+sending: ')' (14@140-149)
+line (12@120-149): '(' (12@120-129) thing (13@130-139) ')' (14@140-149)
+sending: '(' (15@150-159)
+sending: 'x' (16@160-169)
+thing (16@160-169): 'x' (16@160-169)
+sending: ')' (17@170-179)
+line (15@150-179): '(' (15@150-159) thing (16@160-169) ')' (17@170-179)
+sending: '(' (18@180-189)
+sending: 'x' (19@190-199)
+thing (19@190-199): 'x' (19@190-199)
+sending: ')' (20@200-209)
+200-209: memory exhausted
+Freeing nterm thing (19@190-199)
+Freeing nterm line (15@150-179)
+Freeing nterm line (12@120-149)
+Freeing nterm line (9@90-119)
+Freeing nterm line (6@60-89)
+Freeing nterm line (3@30-59)
+Freeing nterm line (0@0-29)
+Parsing FAILED (status 2).
+]])
+])
+
+])
+
+
+# AT_CHECK_PRINTER_AND_DESTRUCTOR([BISON-OPTIONS], [UNION-FLAG], [SKIP_FLAG])
+# ---------------------------------------------------------------------------
+m4_define([AT_CHECK_PRINTER_AND_DESTRUCTOR],
+[AT_SETUP([Printers and Destructors $2: $1])
+
+$3
+_AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4],
+[%error-verbose
+%debug
+%verbose
+%locations
+$1], [$2])
+
+AT_CLEANUP
+])
+
+
+AT_CHECK_PRINTER_AND_DESTRUCTOR([])
+AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
+
+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 %printer and %destructor. ##
+## --------------------------------- ##
+
+# Check that the right %printer and %destructor are called, that they're not
+# called for $end, and that $$ and @$ work correctly.
+
+AT_SETUP([Default %printer and %destructor])
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+%locations
+%initial-action {
+ @$.first_line = @$.last_line = 1;
+ @$.first_column = @$.last_column = 1;
+}
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+ static void yyerror (const char *msg);
+ static int yylex (void);
+# define USE(SYM)
+%}
+
+%printer {
+ fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
+} %symbol-default
+%destructor {
+ fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
+} %symbol-default
+
+%printer {
+ fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
+} 'b' 'c'
+%destructor {
+ fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
+} 'b' 'c'
+
+%%
+
+start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
+
+%%
+
+static int
+yylex (void)
+{
+ static char const input[] = "abcd";
+ static size_t toknum;
+ if (! (toknum < sizeof input))
+ abort ();
+ yylval = input[toknum++];
+ yylloc.first_line = yylloc.last_line = 1;
+ yylloc.first_column = yylloc.last_column = toknum;
+ return yylval;
}
static void
yyerror (const char *msg)
{
- fprintf (stdout, "%d: %s\n", yylloc.first_line, msg);
+ fprintf (stderr, "%s\n", msg);
}
int
main (void)
{
- yydebug = !!getenv ("YYDEBUG");
- if (yyparse ())
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,
+[[Default destructor for 'd' @ 4.
+'b'/'c' destructor for 'c' @ 3.
+'b'/'c' destructor for 'b' @ 2.
+Default destructor for 'a' @ 1.
+]],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' (1.1-1.1: Default printer for 'a' @ 1)
+Shifting token 'a' (1.1-1.1: Default 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: Default printer for 'd' @ 4)
+Shifting token 'd' (1.4-1.4: Default printer for 'd' @ 4)
+Entering state 6
+Reading a token: Now at end of input.
+syntax error, unexpected $end, expecting 'e'
+Error: popping token 'd' (1.4-1.4: Default 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: Default printer for 'a' @ 1)
+Stack now 0
+Cleanup: discarding lookahead token $end (1.5-1.5: )
+Stack now 0
+]])
+
+AT_CLEANUP
+
+
+
+## ----------------------------------- ##
+## Per-type %printer and %destructor. ##
+## ----------------------------------- ##
+
+AT_SETUP([Per-type %printer and %destructor])
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%error-verbose
+%debug
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+ static void yyerror (const char *msg);
+ static int yylex (void);
+# define USE(SYM)
+%}
+
+%union { int field0; int field1; int field2; }
+%type <field0> start 'a' 'g'
+%type <field1> 'e'
+%type <field2> 'f'
+%printer {
+ fprintf (yyoutput, "%%symbol-default/<field2>/e printer");
+} %symbol-default 'e' <field2>
+%destructor {
+ fprintf (stdout, "%%symbol-default/<field2>/e destructor.\n");
+} %symbol-default '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'
+
+%%
+
+start:
+ 'a' 'b' 'c' 'd' 'e' 'f' 'g'
{
- fprintf (stdout, "Parsing FAILED.\n");
- exit (1);
+ USE(($1, $2, $3, $4, $5, $6, $7));
+ $$ = 'S';
}
- fprintf (stdout, "Successful parse.\n");
- return 0;
+ ;
+
+%%
+
+static int
+yylex (void)
+{
+ static char const input[] = "abcdef";
+ static size_t toknum;
+ if (! (toknum < sizeof input))
+ abort ();
+ return input[toknum++];
+}
+
+static void
+yyerror (const char *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
}
]])
AT_CHECK([bison -o input.c input.y])
AT_COMPILE([input])
AT_PARSER_CHECK([./input], 1,
-[[sending: 'x' (value = 0, line 0)
-thing(0): 'x'(0)
-sending: 'x' (value = 1, line 10)
-thing(1): 'x'(1)
-sending: 'x' (value = 2, line 20)
-thing(2): 'x'(2)
-sending: 'x' (value = 3, line 30)
-30: parse error, unexpected 'x', expecting ';'
-Freeing nterm thing (2 from 20)
-Freeing nterm thing (1 from 10)
-Freeing nterm thing (0 from 0)
-Freeing token 'x' (3 from 30)
-sending: 'x' (value = 4, line 40)
-Freeing token 'x' (4 from 40)
-sending: 'x' (value = 5, line 50)
-Freeing token 'x' (5 from 50)
-sending: ';' (value = 6, line 60)
-line(-1): error ';'
-sending: 'x' (value = 7, line 70)
-thing(7): 'x'(7)
-sending: 'x' (value = 8, line 80)
-thing(8): 'x'(8)
-sending: ';' (value = 9, line 90)
-line(7): thing(7) thing(8) ';'
-sending: 'x' (value = 10, line 100)
-thing(10): 'x'(10)
-sending: ';' (value = 11, line 110)
-line(10): thing(10) ';'
-sending: 'y' (value = 12, line 120)
-120: parse error, unexpected $undefined, expecting $end or 'x'
-sending: EOF
-Freeing nterm line (10 from 100)
-Freeing nterm line (7 from 70)
-Freeing nterm line (-1 from 50)
-Parsing FAILED.
+[[%symbol-default/<field2>/e destructor.
+%symbol-default/<field2>/e destructor.
+'d' destructor.
+'c' destructor.
+<field1> destructor.
+%symbol-default/<field2>/e destructor.
+]],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' (%symbol-default/<field2>/e printer)
+Shifting token 'a' (%symbol-default/<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' (%symbol-default/<field2>/e printer)
+Shifting token 'e' (%symbol-default/<field2>/e printer)
+Entering state 7
+Reading a token: Next token is token 'f' (%symbol-default/<field2>/e printer)
+Shifting token 'f' (%symbol-default/<field2>/e printer)
+Entering state 8
+Reading a token: Now at end of input.
+syntax error, unexpected $end, expecting 'g'
+Error: popping token 'f' (%symbol-default/<field2>/e printer)
+Stack now 0 1 3 5 6 7
+Error: popping token 'e' (%symbol-default/<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' (%symbol-default/<field2>/e printer)
+Stack now 0
+Cleanup: discarding lookahead token $end ()
+Stack now 0
+]])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------------- ##
+## Default %printer and %destructor for user-defined end token. ##
+## ------------------------------------------------------------- ##
+
+AT_SETUP([Default %printer and %destructor for user-defined end token])
+
+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>
+ static void yyerror (const char *msg);
+ static int yylex (void);
+# define USE(SYM)
+%}
+
+%token END 0
+%printer {
+ fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
+} %symbol-default
+%destructor {
+ fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
+} %symbol-default
+
+%%
+
+start: { $$ = 'S'; } ;
+
+%%
+
+static int
+yylex (void)
+{
+ static int called;
+ if (called++)
+ abort ();
+ yylval = 'E';
+ yylloc.first_line = yylloc.last_line = 1;
+ yylloc.first_column = yylloc.last_column = 1;
+ return 0;
+}
+
+static void
+yyerror (const char *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 0,
+[[Default destructor for 'E' @ 1.
+Default destructor for 'S' @ 1.
+]],
+[[Starting parse
+Entering state 0
+Reducing stack by rule 1 (line 37):
+-> $$ = nterm start (1.1-1.1: Default printer for 'S' @ 1)
+Stack now 0
+Entering state 1
+Reading a token: Now at end of input.
+Shifting token END (1.1-1.1: Default printer for 'E' @ 1)
+Entering state 2
+Stack now 0 1 2
+Cleanup: popping token END (1.1-1.1: Default printer for 'E' @ 1)
+Cleanup: popping nterm start (1.1-1.1: Default printer for 'S' @ 1)
+]])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------------------ ##
+## Default %printer and %destructor are not for error or $undefined. ##
+## ------------------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor are not for error or \$undefined])
+
+# If Bison were to apply the default %printer and %destructor to the error
+# token or to $undefined:
+# - For the error token:
+# - It would generate warnings for unused $n.
+# - It would invoke the %printer and %destructor on the error token's
+# semantic value, which would be initialized from the lookahead, which
+# would be destroyed separately.
+# - For $undefined, who knows what the semantic value would be.
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+ static void yyerror (const char *msg);
+ static int yylex (void);
+# define USE(SYM)
+%}
+
+%printer {
+ fprintf (yyoutput, "'%c'", $$);
+} %symbol-default
+%destructor {
+ fprintf (stderr, "DESTROY '%c'\n", $$);
+} %symbol-default
+
+%%
+
+start:
+ { $$ = '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)); $$ = 'S'; }
+ ;
+
+%%
+
+static int
+yylex (void)
+{
+ static char const input[] = "abd";
+ static size_t toknum;
+ if (! (toknum < sizeof input))
+ abort ();
+ yylval = input[toknum++];
+ return yylval;
+}
+
+static void
+yyerror (const char *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+int
+main (void)
+{
+ yydebug = 1;
+ return yyparse ();
+}
+]])
+
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], [1], [],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token 'a' ('a')
+Shifting token 'a' ('a')
+Entering state 1
+Reading a token: Next token is token 'b' ('b')
+syntax error
+Shifting token error ()
+Entering state 3
+Next token is token 'b' ('b')
+Shifting token 'b' ('b')
+Entering state 5
+Reading a token: Next token is token $undefined ()
+Error: popping token 'b' ('b')
+DESTROY 'b'
+Stack now 0 1 3
+Error: popping token error ()
+Stack now 0 1
+Shifting token error ()
+Entering state 3
+Next token is token $undefined ()
+Error: discarding token $undefined ()
+Error: popping token error ()
+Stack now 0 1
+Shifting token error ()
+Entering state 3
+Reading a token: Now at end of input.
+Cleanup: discarding lookahead token $end ()
+Stack now 0 1 3
+Cleanup: popping token error ()
+Cleanup: popping token 'a' ('a')
+DESTROY 'a'
+]])
+
+AT_CLEANUP
+
+
+
+## ------------------------------------------------------ ##
+## Default %printer and %destructor are not for $accept. ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor are not for \$accept])
+
+# If YYSTYPE is a union and Bison were to apply the default %printer and
+# %destructor to $accept:
+# - The %printer and %destructor code generated for $accept would always be
+# dead code because $accept is currently never shifted onto the stack.
+# - $$ 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 $$ since the code might assume the type associated with a
+# specific union field, which is especially reasonable in C++ since that
+# type may be a base type. This test case checks for this problem. (Also
+# true for $undefined and the error token, so there are three warnings for
+# %printer and three for %destructor.)
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug /* So that %printer is actually compiled. */
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+ static void yyerror (const char *msg);
+ static int yylex (void);
+# define USE(SYM)
+%}
+
+%printer {
+ char chr = $$;
+ fprintf (yyoutput, "'%c'", chr);
+} %symbol-default
+%destructor {
+ char chr = $$;
+ fprintf (stderr, "DESTROY '%c'\n", chr);
+} %symbol-default
+
+%union { char chr; }
+%type <chr> start
+
+%%
+
+start: { USE($$); } ;
+
+%%
+
+static int
+yylex (void)
+{
+ static int called;
+ if (called++)
+ abort ();
+ return 0;
+}
+
+static void
+yyerror (const char *msg)
+{
+ fprintf (stderr, "%s\n", msg);
+}
+
+int
+main (void)
+{
+ return yyparse ();
+}
]])
+AT_CHECK([bison -o input.c input.y])
+AT_COMPILE([input])
+
AT_CLEANUP
projects / bison.git / blobdiff