mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
258b75caaa
* NEWS: Document the behavior changes. * data/glr.c (yyrecoverSyntaxError): Don't bother to pop the stack before failing, as the cleanup code will do it for us now. * data/lalr1.cc (yyerrlab): Likewise. * data/glr.c (yyparse): Pop everything off the stack before freeing it, so that destructors get called properly. * data/lalr1.cc (yyreturn): Likewise. * data/yacc.c (yyreturn): Pop and destroy the start symbol, too. This is more consistent. * doc/bison.texinfo (Destructor Decl): Mention more reasons why destructors might be called. 1.875 -> 2.1. (Destructor Decl, Decl Summary, Table of Symbols): Some English-language cleanups for %destructor. * tests/actions.at (_AT_CHECK_PRINTER_AND_DESTRUCTOR): Add output line for destructor of start symbol. * tests/calc.at (AT_CHECK_CALC): Add one to line counts, because of that same extra output line.
634 lines
17 KiB
Plaintext
634 lines
17 KiB
Plaintext
# Simple calculator. -*- Autotest -*-
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# Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005 Free Software
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# Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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## ---------------------------------------------------- ##
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## Compile the grammar described in the documentation. ##
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## ---------------------------------------------------- ##
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# ------------------------- #
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# Helping Autotest macros. #
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# ------------------------- #
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# _AT_DATA_CALC_Y($1, $2, $3, [BISON-DIRECTIVES])
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# -----------------------------------------------
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# Produce `calc.y'. Don't call this macro directly, because it contains
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# some occurrences of `$1' etc. which will be interpreted by m4. So
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# you should call it with $1, $2, and $3 as arguments, which is what
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# AT_DATA_CALC_Y does.
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m4_define([_AT_DATA_CALC_Y],
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[m4_if([$1$2$3], $[1]$[2]$[3], [],
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[m4_fatal([$0: Invalid arguments: $@])])dnl
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AT_DATA_GRAMMAR([calc.y],
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[[/* Infix notation calculator--calc */
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]$4[
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#else
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# undef alarm
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# define alarm(seconds) /* empty */
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#endif
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#include <ctype.h>
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/* Exercise pre-prologue dependency to %union. */
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typedef int semantic_value;
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static semantic_value global_result = 0;
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static int global_count = 0;
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%}
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/* Exercise %union. */
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%union
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{
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semantic_value ival;
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};
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%{
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static int power (int base, int exponent);
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]AT_LALR1_CC_IF([typedef yy::location YYLTYPE;],
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[/* yyerror receives the location if:
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- %location & %pure & %glr
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- %location & %pure & %yacc & %parse-param. */
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static void yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *yylloc, ])
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AT_PARAM_IF([semantic_value *result, int *count, ])
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const char *s
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);])[
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static int yylex (]AT_LEX_FORMALS[);
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static int yygetc (]AT_LEX_FORMALS[);
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static void yyungetc (]AT_LEX_PRE_FORMALS[ int c);
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%}
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/* Bison Declarations */
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%token CALC_EOF 0 "end of input"
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%token <ival> NUM "number"
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%type <ival> exp
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%nonassoc '=' /* comparison */
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%left '-' '+'
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%left '*' '/'
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%left NEG /* negation--unary minus */
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%right '^' /* exponentiation */
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/* Grammar follows */
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%%
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input:
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line
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| input line { ]AT_PARAM_IF([++*count; ++global_count;])[ }
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;
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line:
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'\n'
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| exp '\n' { ]AT_PARAM_IF([*result = global_result = $1;])[ }
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;
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exp:
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NUM { $$ = $1; }
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| exp '=' exp
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{
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if ($1 != $3)
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fprintf (stderr, "calc: error: %d != %d\n", $1, $3);
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$$ = $1;
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}
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| exp '+' exp { $$ = $1 + $3; }
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| exp '-' exp { $$ = $1 - $3; }
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| exp '*' exp { $$ = $1 * $3; }
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| exp '/' exp { $$ = $1 / $3; }
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| '-' exp %prec NEG { $$ = -$2; }
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| exp '^' exp { $$ = power ($1, $3); }
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| '(' exp ')' { $$ = $2; }
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| '(' error ')' { $$ = 1111; }
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| '!' { YYERROR; }
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| '-' error { YYERROR; }
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;
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%%
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/* The input. */
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static FILE *yyin;
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]AT_LALR1_CC_IF(
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[/* A C++ error reporting function. */
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void
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yy::parser::error (const location& l, const std::string& m)
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{
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(void) l;
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std::cerr << AT_LOCATION_IF([l << ": " << ])m << std::endl;
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}
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int
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yyparse (AT_PARAM_IF([semantic_value *result, int *count]))
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{
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yy::parser parser[]AT_PARAM_IF([ (result, count)]);
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parser.set_debug_level (!!YYDEBUG);
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return parser.parse ();
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}
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],
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[static void
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yyerror (AT_YYERROR_ARG_LOC_IF([YYLTYPE *yylloc, ])
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AT_PARAM_IF([semantic_value *result, int *count, ])
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const char *s)
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{
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AT_PARAM_IF([(void) result; (void) count;])
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AT_YYERROR_SEES_LOC_IF([
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fprintf (stderr, "%d.%d",
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AT_LOC.first_line, AT_LOC.first_column);
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if (AT_LOC.first_line != AT_LOC.last_line)
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fprintf (stderr, "-%d.%d",
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AT_LOC.last_line, AT_LOC.last_column - 1);
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else if (AT_LOC.first_column != AT_LOC.last_column - 1)
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fprintf (stderr, "-%d",
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AT_LOC.last_column - 1);
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fprintf (stderr, ": ");])
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fprintf (stderr, "%s\n", s);
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}])[
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]AT_LOCATION_IF([
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static YYLTYPE last_yylloc;
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])[
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static int
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yygetc (]AT_LEX_FORMALS[)
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{
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int res = getc (yyin);
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]AT_USE_LEX_ARGS[;
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]AT_LOCATION_IF([
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last_yylloc = AT_LOC;
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if (res == '\n')
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{
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AT_LALR1_CC_IF(
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[ AT_LOC.end.line++;
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AT_LOC.end.column = 0;],
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[ AT_LOC.last_line++;
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AT_LOC.last_column = 0;])
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}
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else
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AT_LALR1_CC_IF(
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[ AT_LOC.end.column++;],
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[ AT_LOC.last_column++;])
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])[
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return res;
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}
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static void
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yyungetc (]AT_LEX_PRE_FORMALS[ int c)
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{
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]AT_USE_LEX_ARGS[;
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]AT_LOCATION_IF([
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/* Wrong when C == `\n'. */
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AT_LOC = last_yylloc;
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])[
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ungetc (c, yyin);
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}
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static int
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read_signed_integer (]AT_LEX_FORMALS[)
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{
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int c = yygetc (]AT_LEX_ARGS[);
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int sign = 1;
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int n = 0;
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]AT_USE_LEX_ARGS[;
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if (c == '-')
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{
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c = yygetc (]AT_LEX_ARGS[);
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sign = -1;
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}
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while (isdigit (c))
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{
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n = 10 * n + (c - '0');
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c = yygetc (]AT_LEX_ARGS[);
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}
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yyungetc (]AT_LEX_PRE_ARGS[ c);
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return sign * n;
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}
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/*---------------------------------------------------------------.
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| Lexical analyzer returns an integer on the stack and the token |
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| NUM, or the ASCII character read if not a number. Skips all |
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| blanks and tabs, returns 0 for EOF. |
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`---------------------------------------------------------------*/
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static int
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yylex (]AT_LEX_FORMALS[)
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{
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static int init = 1;
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int c;
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if (init)
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{
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init = 0;
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]AT_LALR1_CC_IF([],
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[AT_LOCATION_IF([
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AT_LOC.last_column = 0;
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AT_LOC.last_line = 1;
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])])[
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}
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]AT_LOCATION_IF([AT_LALR1_CC_IF(
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[ AT_LOC.begin = AT_LOC.end;],
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[ AT_LOC.first_column = AT_LOC.last_column;
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AT_LOC.first_line = AT_LOC.last_line;
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])])[
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/* Skip white space. */
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while ((c = yygetc (]AT_LEX_ARGS[)) == ' ' || c == '\t')
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{
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]AT_LOCATION_IF([AT_LALR1_CC_IF(
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[ AT_LOC.begin = AT_LOC.end;],
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[ AT_LOC.first_column = AT_LOC.last_column;
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AT_LOC.first_line = AT_LOC.last_line;
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])])[
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}
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/* process numbers */
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if (c == '.' || isdigit (c))
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{
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yyungetc (]AT_LEX_PRE_ARGS[ c);
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]AT_VAL[.ival = read_signed_integer (]AT_LEX_ARGS[);
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return NUM;
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}
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/* Return end-of-file. */
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if (c == EOF)
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return CALC_EOF;
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/* Return single chars. */
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return c;
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}
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static int
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power (int base, int exponent)
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{
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int res = 1;
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if (exponent < 0)
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exit (3);
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for (/* Niente */; exponent; --exponent)
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res *= base;
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return res;
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}
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int
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main (int argc, const char **argv)
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{
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semantic_value result = 0;
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int count = 0;
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int status;
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/* This used to be alarm (10), but that isn't enough time for
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a July 1995 vintage DEC Alphastation 200 4/100 system,
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according to Nelson H. F. Beebe. 100 seconds is enough. */
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alarm (100);
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if (argc == 2)
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yyin = fopen (argv[1], "r");
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else
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yyin = stdin;
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if (!yyin)
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{
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perror (argv[1]);
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return 3;
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}
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]AT_LALR1_CC_IF([], [m4_bmatch([$4], [%debug],
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[ yydebug = 1;])])[
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status = yyparse (]AT_PARAM_IF([&result, &count])[);
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if (global_result != result)
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abort ();
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if (global_count != count)
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abort ();
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return status;
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}
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]])
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])# _AT_DATA_CALC_Y
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# AT_DATA_CALC_Y([BISON-OPTIONS])
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# -------------------------------
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# Produce `calc.y'.
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m4_define([AT_DATA_CALC_Y],
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[_AT_DATA_CALC_Y($[1], $[2], $[3], [$1])
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])
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# _AT_CHECK_CALC(BISON-OPTIONS, INPUT, [NUM-STDERR-LINES = 0])
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# ------------------------------------------------------------
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# Run `calc' on INPUT and expect no STDOUT nor STDERR.
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#
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# If BISON-OPTIONS contains `%debug' but not `%glr-parser', then
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# NUM-STDERR-LINES is the number of expected lines on stderr.
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#
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# We don't count GLR's traces yet, since its traces are somewhat
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# different from LALR's.
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m4_define([_AT_CHECK_CALC],
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[AT_DATA([[input]],
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[[$2
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]])
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AT_PARSER_CHECK([./calc input], 0, [], [stderr])
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m4_bmatch([$1],
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[%debug.*%glr\|%glr.*%debug],
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[],
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[%debug],
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[AT_CHECK([wc -l <stderr | sed 's/[[^0-9]]//g'], 0, [$3
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])])
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])
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# _AT_CHECK_CALC_ERROR(BISON-OPTIONS, EXIT-STATUS, INPUT,
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# [NUM-DEBUG-LINES],
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# [VERBOSE-AND-LOCATED-ERROR-MESSAGE])
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# ---------------------------------------------------------
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# Run `calc' on INPUT, and expect a `syntax error' message.
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#
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# If INPUT starts with a slash, it is used as absolute input file name,
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# otherwise as contents.
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#
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# If BISON-OPTIONS contains `%location', then make sure the ERROR-LOCATION
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# is correctly output on stderr.
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#
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# If BISON-OPTIONS contains `%error-verbose', then make sure the
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# IF-YYERROR-VERBOSE message is properly output after `syntax error, '
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# on STDERR.
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#
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# If BISON-OPTIONS contains `%debug' but not `%glr', then NUM-STDERR-LINES
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# is the number of expected lines on stderr.
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m4_define([_AT_CHECK_CALC_ERROR],
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[m4_bmatch([$3], [^/],
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[AT_PARSER_CHECK([./calc $3], $2, [], [stderr])],
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[AT_DATA([[input]],
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[[$3
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]])
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AT_PARSER_CHECK([./calc input], $2, [], [stderr])])
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m4_bmatch([$1],
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[%debug.*%glr\|%glr.*%debug],
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[],
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[%debug],
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[AT_CHECK([wc -l <stderr | sed 's/[[^0-9]]//g'], 0, [$4
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])])
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# Normalize the observed and expected error messages, depending upon the
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# options.
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# 1. Remove the traces from observed.
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sed '/^Starting/d
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/^Entering/d
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/^Stack/d
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/^Reading/d
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/^Reducing/d
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/^Shifting/d
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/^state/d
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/^Error:/d
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/^Next/d
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/^Discarding/d
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/^yydestructor:/d' stderr >at-stderr
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mv at-stderr stderr
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# 2. Create the reference error message.
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AT_DATA([[expout]],
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[$5
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])
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# 3. If locations are not used, remove them.
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AT_YYERROR_SEES_LOC_IF([],
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[[sed 's/^[-0-9.]*: //' expout >at-expout
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mv at-expout expout]])
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# 4. If error-verbose is not used, strip the`, unexpected....' part.
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m4_bmatch([$1], [%error-verbose], [],
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[[sed 's/syntax error, .*$/syntax error/' expout >at-expout
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mv at-expout expout]])
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# 5. Check
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AT_CHECK([cat stderr], 0, [expout])
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])
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# AT_CHECK_CALC([BISON-OPTIONS [, EXPECTED-TO-FAIL]])
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# ------------------------------
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# Start a testing chunk which compiles `calc' grammar with
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# BISON-OPTIONS, and performs several tests over the parser.
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# However, if EXPECTED-TO-FAIL is nonempty, this test is expected to fail.
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m4_define([AT_CHECK_CALC],
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[# We use integers to avoid dependencies upon the precision of doubles.
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AT_SETUP([Calculator $1])
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m4_ifval([$2], [AT_CHECK([exit 77])])
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AT_BISON_OPTION_PUSHDEFS([$1])
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AT_DATA_CALC_Y([$1])
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AT_LALR1_CC_IF(
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[AT_CHECK([bison -o calc.cc calc.y])
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AT_COMPILE_CXX([calc])],
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[AT_CHECK([bison -o calc.c calc.y])
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AT_COMPILE([calc])])
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# Test the priorities.
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_AT_CHECK_CALC([$1],
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[1 + 2 * 3 = 7
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1 + 2 * -3 = -5
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-1^2 = -1
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(-1)^2 = 1
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---1 = -1
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1 - 2 - 3 = -4
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1 - (2 - 3) = 2
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2^2^3 = 256
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(2^2)^3 = 64],
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[571])
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# Some syntax errors.
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_AT_CHECK_CALC_ERROR([$1], [1], [0 0], [13],
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[1.2: syntax error, unexpected number])
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_AT_CHECK_CALC_ERROR([$1], [1], [1//2], [18],
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[1.2: syntax error, unexpected '/', expecting number or '-' or '(' or '!'])
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_AT_CHECK_CALC_ERROR([$1], [1], [error], [5],
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[1.0: syntax error, unexpected $undefined])
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_AT_CHECK_CALC_ERROR([$1], [1], [1 = 2 = 3], [26],
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[1.6: syntax error, unexpected '='])
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_AT_CHECK_CALC_ERROR([$1], [1],
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[
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+1],
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[16],
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[2.0: syntax error, unexpected '+'])
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# Exercise error messages with EOF: work on an empty file.
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_AT_CHECK_CALC_ERROR([$1], [1], [/dev/null], [4],
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[1.0: syntax error, unexpected end of input])
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# Exercise the error token: without it, we die at the first error,
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# hence be sure to
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#
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# - have several errors which exercise different shift/discardings
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# - (): nothing to pop, nothing to discard
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# - (1 + 1 + 1 +): a lot to pop, nothing to discard
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# - (* * *): nothing to pop, a lot to discard
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# - (1 + 2 * *): some to pop and discard
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#
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# - test the action associated to `error'
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#
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# - check the look-ahead that triggers an error is not discarded
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# when we enter error recovery. Below, the look-ahead causing the
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# first error is ")", which is needed to recover from the error and
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|
# produce the "0" that triggers the "0 != 1" error.
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#
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_AT_CHECK_CALC_ERROR([$1], [0],
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|
[() + (1 + 1 + 1 +) + (* * *) + (1 * 2 * *) = 1],
|
|
[189],
|
|
[1.1: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
|
|
1.17: syntax error, unexpected ')', expecting number or '-' or '(' or '!'
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|
1.22: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
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|
1.40: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
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|
calc: error: 4444 != 1])
|
|
|
|
# The same, but this time exercising explicitly triggered syntax errors.
|
|
# POSIX says the look-ahead causing the error should not be discarded.
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|
_AT_CHECK_CALC_ERROR([$1], [0], [(!) + (0 0) = 1], [76],
|
|
[1.9: syntax error, unexpected number
|
|
calc: error: 2222 != 1])
|
|
_AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (0 0) = 1], [86],
|
|
[1.3: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
|
|
1.11: syntax error, unexpected number
|
|
calc: error: 2222 != 1])
|
|
AT_BISON_OPTION_POPDEFS
|
|
|
|
AT_CLEANUP
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|
])# AT_CHECK_CALC
|
|
|
|
|
|
|
|
|
|
# ------------------------ #
|
|
# Simple LALR Calculator. #
|
|
# ------------------------ #
|
|
|
|
AT_BANNER([[Simple LALR Calculator.]])
|
|
|
|
# AT_CHECK_CALC_LALR([BISON-OPTIONS])
|
|
# -----------------------------------
|
|
# Start a testing chunk which compiles `calc' grammar with
|
|
# BISON-OPTIONS, and performs several tests over the parser.
|
|
m4_define([AT_CHECK_CALC_LALR],
|
|
[AT_CHECK_CALC($@)])
|
|
|
|
AT_CHECK_CALC_LALR()
|
|
|
|
AT_CHECK_CALC_LALR([%defines])
|
|
AT_CHECK_CALC_LALR([%locations])
|
|
AT_CHECK_CALC_LALR([%name-prefix="calc"])
|
|
AT_CHECK_CALC_LALR([%verbose])
|
|
AT_CHECK_CALC_LALR([%yacc])
|
|
AT_CHECK_CALC_LALR([%error-verbose])
|
|
|
|
AT_CHECK_CALC_LALR([%pure-parser %locations])
|
|
AT_CHECK_CALC_LALR([%error-verbose %locations])
|
|
|
|
AT_CHECK_CALC_LALR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_LALR([%debug])
|
|
AT_CHECK_CALC_LALR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_LALR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
|
|
|
|
|
|
# ----------------------- #
|
|
# Simple GLR Calculator. #
|
|
# ----------------------- #
|
|
|
|
AT_BANNER([[Simple GLR Calculator.]])
|
|
|
|
# AT_CHECK_CALC_GLR([BISON-OPTIONS])
|
|
# ----------------------------------
|
|
# Start a testing chunk which compiles `calc' grammar with
|
|
# BISON-OPTIONS and %glr-parser, and performs several tests over the parser.
|
|
m4_define([AT_CHECK_CALC_GLR],
|
|
[AT_CHECK_CALC([%glr-parser] $@)])
|
|
|
|
|
|
AT_CHECK_CALC_GLR()
|
|
|
|
AT_CHECK_CALC_GLR([%defines])
|
|
AT_CHECK_CALC_GLR([%locations])
|
|
AT_CHECK_CALC_GLR([%name-prefix="calc"])
|
|
AT_CHECK_CALC_GLR([%verbose])
|
|
AT_CHECK_CALC_GLR([%yacc])
|
|
AT_CHECK_CALC_GLR([%error-verbose])
|
|
|
|
AT_CHECK_CALC_GLR([%pure-parser %locations])
|
|
AT_CHECK_CALC_GLR([%error-verbose %locations])
|
|
|
|
AT_CHECK_CALC_GLR([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_GLR([%debug])
|
|
AT_CHECK_CALC_GLR([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_GLR([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
|
|
|
|
|
|
# ----------------------------- #
|
|
# Simple LALR1 C++ Calculator. #
|
|
# ----------------------------- #
|
|
|
|
AT_BANNER([[Simple LALR1 C++ Calculator.]])
|
|
|
|
# AT_CHECK_CALC_LALR1_CC([BISON-OPTIONS])
|
|
# ---------------------------------------
|
|
# Start a testing chunk which compiles `calc' grammar with
|
|
# the C++ skeleton, and performs several tests over the parser.
|
|
m4_define([AT_CHECK_CALC_LALR1_CC],
|
|
[AT_CHECK_CALC([%skeleton "lalr1.cc"] $@)])
|
|
|
|
# AT_CHECK_CALC_LALR1_CC()
|
|
|
|
AT_CHECK_CALC_LALR1_CC([%defines %locations])
|
|
|
|
AT_CHECK_CALC_LALR1_CC([%defines])
|
|
# AT_CHECK_CALC_LALR1_CC([%locations])
|
|
# AT_CHECK_CALC_LALR1_CC([%name-prefix="calc"])
|
|
# AT_CHECK_CALC_LALR1_CC([%verbose])
|
|
# AT_CHECK_CALC_LALR1_CC([%yacc])
|
|
# AT_CHECK_CALC_LALR1_CC([%error-verbose])
|
|
|
|
# AT_CHECK_CALC_LALR1_CC([%pure-parser %locations])
|
|
# AT_CHECK_CALC_LALR1_CC([%error-verbose %locations])
|
|
|
|
AT_CHECK_CALC_LALR1_CC([%error-verbose %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
# AT_CHECK_CALC_LALR1_CC([%debug])
|
|
AT_CHECK_CALC_LALR1_CC([%error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc])
|
|
|
|
AT_CHECK_CALC_LALR1_CC([%pure-parser %error-verbose %debug %locations %defines %name-prefix="calc" %verbose %yacc %parse-param {semantic_value *result} %parse-param {int *count}])
|