X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/a3cb6248932cfea1850ac4b981be80b36a98cb68..026816664ff8283a55f91915843a8ff0ac5cf86c:/tests/actions.at?ds=sidebyside diff --git a/tests/actions.at b/tests/actions.at index fa779b39..6c1ecbc1 100644 --- a/tests/actions.at +++ b/tests/actions.at @@ -1,20 +1,19 @@ -# Executing Actions. -*- Autotest -*- -# Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc. +e# Executing Actions. -*- Autotest -*- -# 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) 2001-2013 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., 59 Temple Place - Suite 330, Boston, MA -# 02111-1307, USA. +# along with this program. If not, see . AT_BANNER([[User Actions.]]) @@ -29,15 +28,14 @@ AT_SETUP([Mid-rule actions]) # instead of being attached to the empty rule dedicated to this # action. +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([[input.y]], -[[%{ -# include -# include - static void yyerror (const char *msg); - static int yylex (void); -# define YYDEBUG 1 -# define YYERROR_VERBOSE 1 -%} +[[%define parse.error verbose +%debug +%code { +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +} %% exp: { putchar ('0'); } '1' { putchar ('1'); } @@ -52,35 +50,311 @@ exp: { putchar ('0'); } { putchar ('\n'); } ; %% -static int -yylex (void) +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["123456789"])[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([-d -v -o input.c input.y]) +AT_COMPILE([input]) +AT_PARSER_CHECK([./input], 0, +[[0123456789 +]]) + +AT_CLEANUP + +## ----------------------- ## +## Implicitly empty rule. ## +## ----------------------- ## + +AT_SETUP([Implicitly empty rule]) + +AT_DATA_GRAMMAR([[1.y]], +[[%% +exp: a b; +a: /* empty. */ {}; +// A mid-rule action does not count as an empty rule. +b: {} {}; +]]) + +AT_BISON_CHECK([-fcaret -Wempty-rule 1.y], [0], [], +[[1.y:11.17-18: warning: empty rule without %empty [-Wempty-rule] + a: /* empty. */ {}; + ^^ +]]) + +AT_DATA_GRAMMAR([[2.y]], +[[%% +exp: a b c; +a: /* empty. */ {}; +b: %empty {}; +c: /* empty. */ {}; +]]) + +AT_BISON_CHECK([-fcaret 2.y], [0], [], +[[2.y:11.17-18: warning: empty rule without %empty [-Wempty-rule] + a: /* empty. */ {}; + ^^ +2.y:13.17-18: warning: empty rule without %empty [-Wempty-rule] + c: /* empty. */ {}; + ^^ +]]) + +AT_BISON_CHECK([-fcaret -Wno-empty-rule 2.y], [0]) + +AT_CLEANUP + +## ------------------------ ## +## Invalid uses of %empty. ## +## ------------------------ ## + +AT_SETUP([Invalid uses of %empty]) + +AT_DATA_GRAMMAR([[one.y]], +[[%% +exp: + %empty {} %empty +; +]]) + +AT_BISON_CHECK([-fcaret one.y], [1], [], +[[one.y:11.13-18: error: only one %empty allowed per rule + %empty {} %empty + ^^^^^^ +one.y:11.3-8: previous declaration + %empty {} %empty + ^^^^^^ +]]) + +AT_DATA_GRAMMAR([[two.y]], +[[%% +exp: + 'a' %empty {} +| %empty 'a' {} +| %empty {} {} +; +]]) + +AT_BISON_CHECK([-fcaret two.y], [1], [], +[[two.y:11.7-12: error: %empty on non-empty rule + 'a' %empty {} + ^^^^^^ +two.y:12.3-8: error: %empty on non-empty rule + | %empty 'a' {} + ^^^^^^ +two.y:13.3-8: error: %empty on non-empty rule + | %empty {} {} + ^^^^^^ +]]) + +AT_CLEANUP + +## ---------------------- ## +## Valid uses of %empty. ## +## ---------------------- ## + +AT_SETUP([Valid uses of %empty]) + +AT_BISON_OPTION_PUSHDEFS +AT_DATA_GRAMMAR([[input.y]], +[[ +%debug +%code { - static const char *input = "123456789"; - return *input++; +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ } +%% +exp: %empty {} +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ +]AT_MAIN_DEFINE[ +]]) + +AT_FULL_COMPILE([input]) +AT_PARSER_CHECK([./input]) +AT_BISON_OPTION_POPDEFS +AT_CLEANUP + +## ------------------ ## +## Initial location. ## +## ------------------ ## + +# AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES], [LOCATION = 1.1]) +# ----------------------------------------------------------------------- +# Check that the initial location is correct. +m4_pushdef([AT_TEST], +[AT_SETUP([Initial location: $1 $2]) + +AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2]) +AT_DATA_GRAMMAR([[input.y]], +[[%locations +%debug +%skeleton "$1" +]$2[ +]$3[ +%code +{ +# include +# include /* getenv */ +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +} +%% +exp: { ]AT_SKEL_CC_IF([[std::cerr << @$ << std::endl]], + [[LOCATION_PRINT(stderr, @$); fputc ('\n', stderr)]])[; } +%% +]AT_YYERROR_DEFINE[ + +]AT_YYLEX_PROTOTYPE[ +{]AT_PURE_IF([ + YYUSE(lvalp); + YYUSE(llocp);], [AT_SKEL_CC_IF([ + YYUSE(lvalp); + YYUSE(llocp);])])[ + return 'x'; +} + +int +main (void) +{]AT_SKEL_CC_IF([[ + yy::parser p; + p.set_debug_level (!!getenv("YYDEBUG")); + return p.parse ();]], [[ + yydebug = !!getenv("YYDEBUG"); + return !!yyparse (]AT_PARAM_IF([0])[);]])[ +} +]]) + +AT_FULL_COMPILE([input]) +AT_PARSER_CHECK([./input], 1, [], +[m4_default([$4], [1.1]) +m4_default([$4], [1.1])[: syntax error +]]) +AT_BISON_OPTION_POPDEFS +AT_CLEANUP +]) + +## FIXME: test Java, and iterate over skeletons. +AT_TEST([yacc.c]) +AT_TEST([yacc.c], [%define api.pure full]) +AT_TEST([yacc.c], [%define api.pure %parse-param { int x }]) +AT_TEST([yacc.c], [%define api.push-pull both]) +AT_TEST([yacc.c], [%define api.push-pull both %define api.pure full]) +AT_TEST([glr.c]) +AT_TEST([glr.c], [%define api.pure]) +AT_TEST([lalr1.cc]) +AT_TEST([glr.cc]) + +## A very different test, based on PostgreSQL's implementation of the +## locations. See +## http://lists.gnu.org/archive/html/bug-bison/2012-11/msg00023.html +## +## Weirdly enough, to trigger the warning with GCC 4.7, we must not +## use fprintf, so run the test twice: once to check the warning +## (absence thereof), and another time to check the value. +AT_TEST([yacc.c], [%define api.pure full], +[[%{ +# define YYLTYPE int +# define LOCATION_PRINT(Stream, Loc) \ + (void) (Loc) +# define YYLLOC_DEFAULT(Current, Rhs, N) \ + (Current) = ((Rhs)[N ? 1 : 0]) +%} +]], +[@&t@]) + +AT_TEST([yacc.c], [%define api.pure full], +[[%{ +# define YYLTYPE int +# define LOCATION_PRINT(Stream, Loc) \ + fprintf ((Stream), "%d", (Loc)) +# define YYLLOC_DEFAULT(Current, Rhs, N) \ + (Current) = ((Rhs)[N ? 1 : 0]) +%} +]], +[0]) + + +m4_popdef([AT_TEST]) + -static void -yyerror (const char *msg) + +## ---------------- ## +## Location Print. ## +## ---------------- ## + +# AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES]) +# ----------------------------------------------------- +# Check that the initial location is correct. +m4_pushdef([AT_TEST], +[AT_SETUP([Location print: $1 $2]) + +AT_BISON_OPTION_PUSHDEFS([%locations %skeleton "$1" $2]) +AT_DATA_GRAMMAR([[input.y]], +[[%locations +%debug +%skeleton "$1" +]$2[ +]$3[ +%code { - fprintf (stderr, "%s\n", msg); +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ } +%% +exp: %empty; +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ int main (void) { - return yyparse (); + ]AT_YYLTYPE[ loc; +]AT_GLR_CC_IF([loc.initialize();])[ +#define TEST(L1, C1, L2, C2) \ + loc.]AT_FIRST_LINE[ = L1; \ + loc.]AT_FIRST_COLUMN[ = C1; \ + loc.]AT_LAST_LINE[ = L2; \ + loc.]AT_LAST_COLUMN[ = C2; \ + ]AT_SKEL_CC_IF([std::cout << loc], + [LOCATION_PRINT(stdout, loc)])[;\ + putchar ('\n'); + + TEST(1, 1, 1, 1); + TEST(2, 1, 2, 10); + TEST(3, 1, 4, 1); + TEST(5, 1, 6, 10); + + TEST(7, 2, 0, 2); + TEST(8, 0, 8, 0); + return 0; } ]]) -AT_CHECK([bison -d -v -o input.c input.y]) -AT_COMPILE([input]) +AT_FULL_COMPILE([input]) AT_PARSER_CHECK([./input], 0, -[[0123456789 +[[1.1 +2.1-9 +3.1-4.0 +5.1-6.9 +7.2 +8.0 ]]) - +AT_BISON_OPTION_POPDEFS AT_CLEANUP +]) +## FIXME: test Java, and iterate over skeletons. +AT_TEST([yacc.c]) +AT_TEST([glr.c]) +AT_TEST([lalr1.cc]) +AT_TEST([glr.cc]) +m4_popdef([AT_TEST]) @@ -90,15 +364,15 @@ AT_CLEANUP AT_SETUP([Exotic Dollars]) +AT_BISON_OPTION_PUSHDEFS AT_DATA_GRAMMAR([[input.y]], -[[%{ -# include -# include - static void yyerror (const char *msg); - static int yylex (void); -# define YYDEBUG 1 -# define YYERROR_VERBOSE 1 -%} +[[%define parse.error verbose +%debug +%code { +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +# define USE(Var) +} %union { @@ -112,6 +386,7 @@ AT_DATA_GRAMMAR([[input.y]], exp: a_1 a_2 { $$ = 3; } { $$ = $3 + 1; } a_5 sum_of_the_five_previous_values { + USE (($1, $2, $3, $4, $5)); printf ("%d\n", $6); } ; @@ -126,31 +401,47 @@ sum_of_the_five_previous_values: ; %% -static int -yylex (void) -{ - return EOF; -} - -static void -yyerror (const char *msg) -{ - fprintf (stderr, "%s\n", msg); -} - -int -main (void) -{ - return yyparse (); -} +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ +]AT_MAIN_DEFINE[ ]]) -AT_CHECK([bison -d -v -o input.c input.y]) +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]], +[[ +%{ +]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[ +]AT_MAIN_DEFINE[ +]]) + +AT_FULL_COMPILE([input]) +AT_PARSER_CHECK([[./input]], [[0]], +[[6 +]]) + +AT_BISON_OPTION_POPDEFS AT_CLEANUP @@ -159,41 +450,49 @@ 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 #include +#include #include -]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 +#define YYINITDEPTH 10 +#define YYMAXDEPTH 10 +#define RANGE(Location) ]AT_LALR1_CC_IF([(Location).begin.line, (Location).end.line], + [(Location).first_line, (Location).last_line])[ + +/* 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([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 '(' 'x' 'y' ')' ';' thing line input])[ +]m4_ifval([$6], [%type '(' 'x' 'y' ')' ';' thing line input END])[ +/* FIXME: This %printer isn't actually tested. */ %printer { ]AT_LALR1_CC_IF([debug_stream () << $$;], @@ -202,29 +501,34 @@ m4_ifval([$6], [%union 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", $$, RANGE (@$)); } + END + %% /* This grammar is made to exercise error recovery. - "Lines" starting with `(' support error recovery, with + "Lines" starting with '(' support error recovery, with ')' as synchronizing token. Lines starting with 'x' can never be recovered from if in error. */ @@ -233,14 +537,15 @@ input: /* Nothing. */ { $$ = 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, $$, @$, ": "); + V(line, $1, @1, " "); + V(input, $2, @2, "\n"); } ; @@ -248,28 +553,36 @@ line: thing thing thing ';' { $$ = $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, $$, @$, ": "); + V('(', $1, @1, " "); + fprintf (stderr, "error (@%d-%d) ", RANGE(@2)); + V(')', $3, @3, "\n"); } ; @@ -277,81 +590,63 @@ thing: 'x' { $$ = $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 *yysource = 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++; + unsigned 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 (yysource[c]) - printf ("sending: '%c'", yysource[c]); + ]AT_LOC_FIRST_LINE[ = ]AT_LOC_FIRST_COLUMN[ = 10 * c; + ]AT_LOC_LAST_LINE[ = ]AT_LOC_LAST_COLUMN[ = ]AT_LOC_FIRST_LINE[ + 9; + assert (c <= strlen (source)); + if (source[c]) + fprintf (stderr, "sending: '%c'", source[c]); else - printf ("sending: EOF"); - printf (" (%d@%d-%d)\n", c, RANGE (]AT_LOC[)); - return yysource[c]; + 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_ () -{ - printf ("%d-%d: %s\n", RANGE (location), message.c_str()); -} - -static bool yydebug; +[static bool yydebug; int yyparse () { - yy::Parser parser; + 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); - yysource = argv[1]; - if (yyparse ()) + source = argv[1]; + status = yyparse (); + switch (status) { - printf ("Parsing FAILED.\n"); - exit (1); + 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; } - printf ("Successful parse.\n"); - return 0; + 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" @@ -359,15 +654,17 @@ AT_LALR1_CC_IF( # 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. ]]) @@ -376,23 +673,25 @@ 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. ]]) # Syntax errors caught by the parser # ---------------------------------- -# Exercise the discarding of stack top and input until `error' +# Exercise the discarding of stack top and input until 'error' # can be reduced. # # '(', 'x', 'x', 'x', 'x', 'x', ')', @@ -404,14 +703,14 @@ 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) @@ -436,23 +735,109 @@ 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 +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, [], +[[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) +200.200-209.208: 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_BISON_OPTION_POPDEFS +])# _AT_CHECK_PRINTER_AND_DESTRUCTOR + # 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]) +[AT_SETUP([Printers and Destructors$2]m4_ifval([$1], [[: $1]])) $3 _AT_CHECK_PRINTER_AND_DESTRUCTOR($[1], $[2], $[3], $[4], -[%error-verbose +[%define parse.error verbose %debug %verbose %locations @@ -463,15 +848,864 @@ AT_CLEANUP AT_CHECK_PRINTER_AND_DESTRUCTOR([]) -AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union]) +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([exit 77])]) -AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union], - [AT_CHECK([exit 77])]) +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]) +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 $$ and @$ work correctly. + +AT_SETUP([Default tagless %printer and %destructor]) +AT_BISON_OPTION_PUSHDEFS([%locations %debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%define parse.error verbose +%debug +%locations + +%code { +]AT_YYLEX_DECLARE[ +]AT_YYERROR_DECLARE[ +# define USE(SYM) +} + +%printer { + fprintf (yyoutput, "<*> printer should not be called.\n"); +} <*> + +%printer { + fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.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]])[ +]AT_MAIN_DEFINE[ +]]) + +AT_BISON_CHECK([-o input.c input.y], [], [], +[[input.y:30.3-5: warning: useless %destructor for type <*> [-Wother] +input.y:30.3-5: warning: useless %printer for type <*> [-Wother] +]]) +AT_COMPILE([input]) +AT_PARSER_CHECK([./input --debug], 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: <> printer for 'a' @ 1) +Shifting token 'a' (1.1: <> printer for 'a' @ 1) +Entering state 1 +Reading a token: Next token is token 'b' (1.2: 'b'/'c' printer for 'b' @ 2) +Shifting token 'b' (1.2: 'b'/'c' printer for 'b' @ 2) +Entering state 3 +Reading a token: Next token is token 'c' (1.3: 'b'/'c' printer for 'c' @ 3) +Shifting token 'c' (1.3: 'b'/'c' printer for 'c' @ 3) +Entering state 5 +Reading a token: Next token is token 'd' (1.4: <> printer for 'd' @ 4) +Shifting token 'd' (1.4: <> printer for 'd' @ 4) +Entering state 6 +Reading a token: Now at end of input. +1.5: syntax error, unexpected $end, expecting 'e' +Error: popping token 'd' (1.4: <> printer for 'd' @ 4) +Stack now 0 1 3 5 +Error: popping token 'c' (1.3: 'b'/'c' printer for 'c' @ 3) +Stack now 0 1 3 +Error: popping token 'b' (1.2: 'b'/'c' printer for 'b' @ 2) +Stack now 0 1 +Error: popping token 'a' (1.1: <> printer for 'a' @ 1) +Stack now 0 +Cleanup: discarding lookahead token $end (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([%debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%define parse.error verbose +%debug + +%{ +]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 start 'a' 'g' +%type 'e' +%type 'f' +%printer { + fprintf (yyoutput, "<*>//e printer"); +} <*> 'e' +%destructor { + fprintf (stdout, "<*>//e destructor.\n"); +} <*> 'e' + +%type 'b' +%printer { fprintf (yyoutput, " printer"); } +%destructor { fprintf (stdout, " destructor.\n"); } + +%type 'c' +%printer { fprintf (yyoutput, "'c' printer"); } 'c' +%destructor { fprintf (stdout, "'c' destructor.\n"); } 'c' + +%type '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"])[ +]AT_MAIN_DEFINE[ +]]) + +AT_BISON_CHECK([-o input.c input.y], [], [], +[[input.y:22.3-4: warning: useless %destructor for type <> [-Wother] +input.y:22.3-4: warning: useless %printer for type <> [-Wother] +]]) +AT_COMPILE([input]) +AT_PARSER_CHECK([./input --debug], 1, +[[<*>//e destructor. +<*>//e destructor. +'d' destructor. +'c' destructor. + destructor. +<*>//e destructor. +]], +[[Starting parse +Entering state 0 +Reading a token: Next token is token 'a' (<*>//e printer) +Shifting token 'a' (<*>//e printer) +Entering state 1 +Reading a token: Next token is token 'b' ( printer) +Shifting token 'b' ( 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' (<*>//e printer) +Shifting token 'e' (<*>//e printer) +Entering state 7 +Reading a token: Next token is token 'f' (<*>//e printer) +Shifting token 'f' (<*>//e printer) +Entering state 8 +Reading a token: Now at end of input. +syntax error, unexpected $end, expecting 'g' +Error: popping token 'f' (<*>//e printer) +Stack now 0 1 3 5 6 7 +Error: popping token 'e' (<*>//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' ( printer) +Stack now 0 1 +Error: popping token 'a' (<*>//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_TEST(TYPED) +# -------------- +m4_pushdef([AT_TEST], +[m4_if($1, 0, + [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])], + [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])]) + +AT_BISON_OPTION_PUSHDEFS([%locations %debug]) +AT_DATA_GRAMMAR([[input]]$1[[.y]], +[[%define parse.error verbose +%debug +%locations + +%code { +]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", $$, @$.first_column); +} <]]kind[[> + +%printer { + fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n"); +} <]]not_kind[[> + +]]m4_if($1, 0, [[[ +]]], +[[[%union { char tag; } +%type start END]]])[[ + +%% + +start: { $$ = 'S'; } ; + +%% +#include /* abort */ +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[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([-o input$1.c input$1.y], [], [], +[m4_if([$1], [0], +[[input0.y:30.3-5: warning: useless %destructor for type <*> [-Wother] +input0.y:30.3-5: warning: useless %printer for type <*> [-Wother] +]], +[[input1.y:30.3-4: warning: useless %destructor for type <> [-Wother] +input1.y:30.3-4: warning: useless %printer for type <> [-Wother] +]])]) + +AT_COMPILE([input$1]) + +AT_PARSER_CHECK([./input$1 --debug], 0, +[[<]]kind[[> for 'E' @ 1. +<]]kind[[> for 'S' @ 1. +]], +[[Starting parse +Entering state 0 +Reducing stack by rule 1 (line 49): +-> $$ = nterm start (1.1: <]]kind[[> for 'S' @ 1) +Stack now 0 +Entering state 1 +Reading a token: Now at end of input. +Shifting token END (1.1: <]]kind[[> for 'E' @ 1) +Entering state 2 +Stack now 0 1 2 +Cleanup: popping token END (1.1: <]]kind[[> for 'E' @ 1) +Cleanup: popping nterm start (1.1: <]]kind[[> for 'S' @ 1) +]]) + +m4_popdef([kind]) +m4_popdef([not_kind]) +]) + +AT_TEST(0) +AT_TEST(1) + +m4_popdef([AT_TEST]) + +AT_CLEANUP + + + +## ------------------------------------------------------------------ ## +## Default %printer and %destructor are not for error or $undefined. ## +## ------------------------------------------------------------------ ## + +AT_SETUP([Default %printer and %destructor are not for error or $undefined]) + +# If Bison were to apply the default %printer and %destructor to the error +# token or to $undefined: +# - For the error token: +# - It would generate warnings for unused $n. +# - It would invoke the %printer and %destructor on the error token's +# semantic value, which would be initialized from the lookahead, which +# would be destroyed separately. +# - For $undefined, who knows what the semantic value would be. +AT_BISON_OPTION_PUSHDEFS([%debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%debug + +%{ +# include +# include +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +# define USE(SYM) +%} + +%printer { + fprintf (yyoutput, "'%c'", $$); +} <> <*> +%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)); $$ = 'S'; } + ; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(["abd"], [yylval = res])[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([-o input.c input.y], [], [], +[[input.y:23.6-8: warning: useless %destructor for type <*> [-Wother] +input.y:23.6-8: warning: useless %printer for type <*> [-Wother] +]]) +AT_COMPILE([input]) +AT_PARSER_CHECK([./input --debug], [1], [], +[[Starting parse +Entering state 0 +Reading a token: Next token is token 'a' ('a') +Shifting token 'a' ('a') +Entering state 1 +Reading a token: Next token is token 'b' ('b') +syntax error +Shifting token error () +Entering state 3 +Next token is token 'b' ('b') +Shifting token 'b' ('b') +Entering state 5 +Reading a token: Next token is token $undefined () +Error: popping token 'b' ('b') +DESTROY 'b' +Stack now 0 1 3 +Error: popping token error () +Stack now 0 1 +Shifting token error () +Entering state 3 +Next token is token $undefined () +Error: discarding token $undefined () +Error: popping token error () +Stack now 0 1 +Shifting token error () +Entering state 3 +Reading a token: Now at end of input. +Cleanup: discarding lookahead token $end () +Stack now 0 1 3 +Cleanup: popping token error () +Cleanup: popping token 'a' ('a') +DESTROY 'a' +]]) + +AT_CLEANUP + + + +## ------------------------------------------------------ ## +## Default %printer and %destructor are not for $accept. ## +## ------------------------------------------------------ ## + +AT_SETUP([Default %printer and %destructor are not for $accept]) + +# If YYSTYPE is a union and Bison were to apply the default %printer and +# %destructor to $accept: +# - The %printer and %destructor code generated for $accept would always be +# dead code because $accept is currently never shifted onto the stack. +# - $$ for $accept would always be of type YYSTYPE because it's not possible +# to declare '%type $accept'. (Also true for $undefined.) +# - Thus, the compiler might complain that the user code assumes the wrong +# type for $$ since the code might assume the type associated with a +# specific union field, which is especially reasonable in C++ since that +# type may be a base type. This test case checks for this problem. (Also +# true for $undefined and the error token, so there are three warnings for +# %printer and three for %destructor.) + +AT_BISON_OPTION_PUSHDEFS([%debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%debug /* So that %printer is actually compiled. */ + +%{ +# include +# include +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +# define USE(SYM) +%} + +%printer { + char chr = $$; + fprintf (yyoutput, "'%c'", chr); +} <> <*> +%destructor { + char chr = $$; + fprintf (stderr, "DESTROY '%c'\n", chr); +} <> <*> + +%union { char chr; } +%type start + +%% + +start: { USE($$); } ; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([-o input.c input.y], [], [], +[[input.y:24.3-4: warning: useless %destructor for type <> [-Wother] +input.y:24.3-4: warning: useless %printer for type <> [-Wother] +]]) +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([%debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%debug /* So that %printer is actually compiled. */ + +%{ +]AT_YYERROR_DECLARE[ +]AT_YYLEX_DECLARE[ +# define USE(SYM) +# define YYLTYPE int +# define YYLLOC_DEFAULT(Current, Rhs, N) (void)(Rhs) +# define 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 (($$, $2, $4, $5)); @$ = 0; } + ; + +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE[ +]AT_MAIN_DEFINE[ +]]) +AT_BISON_OPTION_POPDEFS + +AT_BISON_CHECK([-o input.c input.y], 0,, +[[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother] +input.y:24.70-72: warning: useless %printer for type <*> [-Wother] +input.y:33.3-23: warning: unset value: $$ [-Wother] +input.y:32.3-23: warning: unused value: $3 [-Wother] +]]) + +AT_BISON_CHECK([-fcaret -o input.c input.y], 0,, +[[input.y:24.70-72: warning: useless %destructor for type <*> [-Wother] + %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*> + ^^^ +input.y:24.70-72: warning: useless %printer for type <*> [-Wother] + %printer { fprintf (yyoutput, "<*> printer should not be called"); } <*> + ^^^ +input.y:33.3-23: warning: unset value: $$ [-Wother] + { @$ = 4; } // Only used. + ^^^^^^^^^^^^^^^^^^^^^ +input.y:32.3-23: warning: unused value: $3 [-Wother] + { USE ($$); @$ = 3; } // Only set. + ^^^^^^^^^^^^^^^^^^^^^ +]]) + +AT_COMPILE([input]) +AT_PARSER_CHECK([./input --debug], 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([%debug]) +AT_DATA_GRAMMAR([[input.y]], +[[%code { + #include +]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[ +]AT_MAIN_DEFINE[ +]]) + +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]]) + + +## ------------------------- ## +## Qualified $$ in actions. ## +## ------------------------- ## + +# Check that we can use qualified $$ (v.g., $$) not only in rule +# actions, but also where $$ is valid: %destructor/%printer and +# %initial-action. +# +# FIXME: Not actually checking %destructor, but it's the same code as +# %printer... +# +# To do that, use a semantic value that has two fields (sem_type), +# declare symbols to have only one of these types (INT, float), and +# use $$ to get the other one. Including for symbols that are +# not typed (UNTYPED). + +m4_pushdef([AT_TEST], +[AT_SETUP([[Qualified $$ in actions: $1]]) + +AT_BISON_OPTION_PUSHDEFS([%skeleton "$1" %debug]) + +AT_DATA_GRAMMAR([[input.y]], +[[%skeleton "$1" +%debug +%code requires +{ + typedef struct sem_type + { + int ival; + float fval; + } sem_type; + +# define YYSTYPE sem_type + +]AT_SKEL_CC_IF([[ +# include + static void + report (std::ostream& yyo, int ival, float fval) + { + yyo << "ival: " << ival << ", fval: " << fval; + } +]], [[ +# include + static void + report (FILE* yyo, int ival, float fval) + { + fprintf (yyo, "ival: %d, fval: %1.1f", ival, fval); + } +]])[ +} + +%code +{ + ]AT_YYERROR_DECLARE[ + ]AT_YYLEX_DECLARE[ +} + +%token UNTYPED +%token INT +%type float +%printer { report (yyo, $$, $$); } ; +%printer { report (yyo, $$, $$ ); } ; +%printer { report (yyo, $$, $$); } <>; + +%initial-action +{ + $$ = 42; + $$ = 4.2; +} + +%% +float: UNTYPED INT +{ + $$ = $1 + $2; + $$ = $1 + $][2; +}; +%% +]AT_YYERROR_DEFINE[ +]AT_YYLEX_DEFINE(AT_SKEL_CC_IF([[{yy::parser::token::UNTYPED, + yy::parser::token::INT, + EOF}]], + [[{UNTYPED, INT, EOF}]]), + [AT_VAL.ival = toknum * 10; AT_VAL.fval = toknum / 10.0;])[ +]AT_MAIN_DEFINE[ +]]) + +AT_FULL_COMPILE([[input]]) +AT_PARSER_CHECK([./input --debug], 0, [], [stderr]) +# Don't be too picky on the traces, GLR is not exactly the same. Keep +# only the lines from the printer. +AT_CHECK([[sed -ne '/ival:/p' stderr]], 0, +[[Reading a token: Next token is token UNTYPED (ival: 10, fval: 0.1) +Shifting token UNTYPED (ival: 10, fval: 0.1) +Reading a token: Next token is token INT (ival: 20, fval: 0.2) +Shifting token INT (ival: 20, fval: 0.2) + $][1 = token UNTYPED (ival: 10, fval: 0.1) + $][2 = token INT (ival: 20, fval: 0.2) +-> $$ = nterm float (ival: 30, fval: 0.3) +Cleanup: popping nterm float (ival: 30, fval: 0.3) +]]) + +AT_BISON_OPTION_POPDEFS + +AT_CLEANUP +]) + +AT_TEST([yacc.c]) +AT_TEST([glr.c]) +AT_TEST([lalr1.cc]) +AT_TEST([glr.cc]) + +m4_popdef([AT_TEST]) + +## -------------------------------------------------- ## +## 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 + #include +]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"])[ +]AT_MAIN_DEFINE[ +]]) +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 %debug]) + +AT_DATA_GRAMMAR([input.y], +[[ +%error-verbose +%debug +%pure-parser +%code { +# include +# include +# include + + ]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])[ +]AT_MAIN_DEFINE[ +]]) +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