X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/848dc439cb25182820ad0ae641d1ef62e1533222..abd189e8dc6ca848f038da12e4110d6192374b82:/tests/regression.at diff --git a/tests/regression.at b/tests/regression.at index 51495b89..c07b7442 100644 --- a/tests/regression.at +++ b/tests/regression.at @@ -1,30 +1,84 @@ # Bison Regressions. -*- Autotest -*- -# Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. -# This program is free software; you can redistribute it and/or modify -# it under the terms of the GNU General Public License as published by -# the Free Software Foundation; either version 2, or (at your option) -# any later version. +# Copyright (C) 2001-2011 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([[Regression tests.]]) -## ------------------------- ## -## Early token definitions. ## -## ------------------------- ## +## ------------------ ## +## Trivial grammars. ## +## ------------------ ## +AT_SETUP([Trivial grammars]) -AT_SETUP([Early token definitions]) +AT_DATA_GRAMMAR([input.y], +[[%{ +void yyerror (char const *); +int yylex (void); +#define YYSTYPE int * +%} + +%error-verbose + +%% + +program: 'x'; +]]) + +AT_BISON_CHECK([-o input.c input.y]) +AT_COMPILE([input.o], [-c input.c]) +AT_COMPILE([input.o], [-DYYDEBUG -c input.c]) + +AT_CLEANUP + + + +## ----------------- ## +## YYSTYPE typedef. ## +## ----------------- ## + +AT_SETUP([YYSTYPE typedef]) + +AT_DATA_GRAMMAR([input.y], +[[%{ +void yyerror (char const *); +int yylex (void); +typedef union { char const *val; } YYSTYPE; +%} + +%type program + +%% + +program: { $$ = ""; }; +]]) + +AT_BISON_CHECK([-o input.c input.y]) +AT_COMPILE([input.o], [-c input.c]) + +AT_CLEANUP + + + +## ------------------------------------- ## +## Early token definitions with --yacc. ## +## ------------------------------------- ## + + +AT_SETUP([Early token definitions with --yacc]) # Found in GCJ: they expect the tokens to be defined before the user # prologue, so that they can use the token definitions in it. @@ -50,7 +104,50 @@ exp: MY_TOKEN; %% ]]) -AT_CHECK([bison -o input.c input.y]) +AT_BISON_CHECK([-y -o input.c input.y]) +AT_COMPILE([input.o], [-c input.c]) + +AT_CLEANUP + + + +## ---------------------------------------- ## +## Early token definitions without --yacc. ## +## ---------------------------------------- ## + + +AT_SETUP([Early token definitions without --yacc]) + +# Found in GCJ: they expect the tokens to be defined before the user +# prologue, so that they can use the token definitions in it. + +AT_DATA_GRAMMAR([input.y], +[[%{ +#include +void yyerror (const char *s); +int yylex (void); +void print_my_token (void); +%} + +%union +{ + int val; +}; +%{ +void +print_my_token (void) +{ + enum yytokentype my_token = MY_TOKEN; + printf ("%d\n", my_token); +} +%} +%token MY_TOKEN +%% +exp: MY_TOKEN; +%% +]]) + +AT_BISON_CHECK([-o input.c input.y]) AT_COMPILE([input.o], [-c input.c]) AT_CLEANUP @@ -72,7 +169,7 @@ exp: { tests = {{{{{{{{{{}}}}}}}}}}; }; %% ]]) -AT_CHECK([bison -v -o input.c input.y]) +AT_BISON_CHECK([-v -o input.c input.y]) AT_CHECK([grep 'tests = {{{{{{{{{{}}}}}}}}}};' input.c], 0, [ignore]) @@ -99,7 +196,7 @@ exp: '(' exp ')' | NUM ; %% ]]) -AT_CHECK([bison -v -o input.c input.y], 0, [], +AT_BISON_CHECK([-v -o input.c input.y], 0, [], [[input.y:6.8-14: warning: symbol `"<="' used more than once as a literal string ]]) @@ -144,7 +241,7 @@ expr: }; ]]) -AT_CHECK([bison -o input.c -v input.y]) +AT_BISON_CHECK([-o input.c -v input.y]) # Check the contents of the report. AT_CHECK([cat input.output], [], @@ -152,13 +249,13 @@ AT_CHECK([cat input.output], [], 0 $accept: expr $end - 1 @1: /* empty */ + 1 $@1: /* empty */ - 2 expr: 'a' @1 'b' + 2 expr: 'a' $@1 'b' - 3 @2: /* empty */ + 3 $@2: /* empty */ - 4 expr: @2 'c' + 4 expr: $@2 'c' Terminals, with rules where they appear @@ -176,9 +273,9 @@ $accept (6) on left: 0 expr (7) on left: 2 4, on right: 0 -@1 (8) +$@1 (8) on left: 1, on right: 2 -@2 (9) +$@2 (9) on left: 3, on right: 4 @@ -188,19 +285,19 @@ state 0 'a' shift, and go to state 1 - $default reduce using rule 3 (@2) + $default reduce using rule 3 ($@2) expr go to state 2 - @2 go to state 3 + $@2 go to state 3 state 1 - 2 expr: 'a' . @1 'b' + 2 expr: 'a' . $@1 'b' - $default reduce using rule 1 (@1) + $default reduce using rule 1 ($@1) - @1 go to state 4 + $@1 go to state 4 state 2 @@ -212,14 +309,14 @@ state 2 state 3 - 4 expr: @2 . 'c' + 4 expr: $@2 . 'c' 'c' shift, and go to state 6 state 4 - 2 expr: 'a' @1 . 'b' + 2 expr: 'a' $@1 . 'b' 'b' shift, and go to state 7 @@ -233,14 +330,14 @@ state 5 state 6 - 4 expr: @2 'c' . + 4 expr: $@2 'c' . $default reduce using rule 4 (expr) state 7 - 2 expr: 'a' @1 'b' . + 2 expr: 'a' $@1 'b' . $default reduce using rule 2 (expr) ]]) @@ -266,7 +363,7 @@ exp: ; %% ]]) -AT_CHECK([bison -v -o input.c input.y]) +AT_BISON_CHECK([-v -o input.c input.y]) AT_CLEANUP @@ -289,7 +386,7 @@ default: 'a' } %{ ]]) -AT_CHECK([bison input.y], [1], [], +AT_BISON_CHECK([input.y], [1], [], [[input.y:2.1: invalid character: `?' input.y:3.14: invalid character: `}' input.y:4.1: invalid character: `%' @@ -298,6 +395,26 @@ input.y:5.1-17: invalid directive: `%a-does-not-exist' input.y:6.1: invalid character: `%' input.y:6.2: invalid character: `-' input.y:7.1-8.0: missing `%}' at end of file +input.y:7.1-8.0: syntax error, unexpected %{...%} +]]) + +AT_CLEANUP + + +AT_SETUP([Invalid inputs with {}]) + +AT_DATA([input.y], +[[ +%destructor +%initial-action +%lex-param +%parse-param +%printer +%union +]]) + +AT_BISON_CHECK([input.y], [1], [], +[[input.y:3.1-15: syntax error, unexpected %initial-action, expecting {...} ]]) AT_CLEANUP @@ -314,20 +431,62 @@ AT_SETUP([Token definitions]) # Bison managed, when fed with `%token 'f' "f"' to #define 'f'! AT_DATA_GRAMMAR([input.y], [%{ +#include +#include void yyerror (const char *s); int yylex (void); %} -[%token MYEOF 0 "end of file" +[%error-verbose +%token MYEOF 0 "end of file" %token 'a' "a" -%token b "b" -%token c 'c' -%token 'd' d +%token B_TOKEN "b" +%token C_TOKEN 'c' +%token 'd' D_TOKEN +%token SPECIAL "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!" +%token SPECIAL "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!" +%% +exp: "a" "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!"; %% -exp: "a"; +void +yyerror (char const *s) +{ + fprintf (stderr, "%s\n", s); +} + +int +yylex (void) +{ + static int called; + if (called++) + abort (); + return SPECIAL; +} + +int +main (void) +{ + return yyparse (); +} ]]) -AT_CHECK([bison -o input.c input.y]) -AT_COMPILE([input.o], [-c input.c]) +# Checking the warning message guarantees that the trigraph "??!" isn't +# unnecessarily escaped here even though it would need to be if encoded in a +# C-string literal. Also notice that unnecessary escaping, such as "\?", from +# the user specification is eliminated. +AT_BISON_CHECK([-o input.c input.y], [[0]], [[]], +[[input.y:22.8-14: warning: symbol SPECIAL redeclared +input.y:22.8-63: warning: symbol `"\\'?\"\a\b\f\n\r\t\v\001\201\001\201??!"' used more than once as a literal string +]]) +AT_COMPILE([input]) + +# Checking the error message here guarantees that yytname, which does contain +# C-string literals, does have the trigraph escaped correctly. Thus, the +# symbol name reported by the parser is exactly the same as that reported by +# Bison itself. +AT_DATA([experr], +[[syntax error, unexpected "\\'?\"\a\b\f\n\r\t\v\001\201\001\201??!", expecting a +]]) +AT_PARSER_CHECK([./input], 1, [], [experr]) AT_CLEANUP @@ -353,7 +512,7 @@ exp: ]]) # Pacify font-lock-mode: " -AT_CHECK([bison -o input.c input.y]) +AT_BISON_CHECK([-o input.c input.y]) AT_COMPILE([input.o], [-c input.c]) AT_CLEANUP @@ -393,7 +552,7 @@ CONST_DEC: %% ]]) -AT_CHECK([bison -v input.y]) +AT_BISON_CHECK([-v input.y]) AT_CHECK([cat input.output], 0, [[Grammar @@ -404,9 +563,9 @@ AT_CHECK([cat input.output], 0, 2 CONST_DEC_LIST: CONST_DEC 3 | CONST_DEC_LIST CONST_DEC - 4 @1: /* empty */ + 4 $@1: /* empty */ - 5 CONST_DEC: @1 undef_id_tok '=' const_id_tok ';' + 5 CONST_DEC: $@1 undef_id_tok '=' const_id_tok ';' Terminals, with rules where they appear @@ -429,7 +588,7 @@ CONST_DEC_LIST (9) on left: 2 3, on right: 1 3 CONST_DEC (10) on left: 5, on right: 2 3 -@1 (11) +$@1 (11) on left: 4, on right: 5 @@ -437,12 +596,12 @@ state 0 0 $accept: . CONST_DEC_PART $end - $default reduce using rule 4 (@1) + $default reduce using rule 4 ($@1) CONST_DEC_PART go to state 1 CONST_DEC_LIST go to state 2 CONST_DEC go to state 3 - @1 go to state 4 + $@1 go to state 4 state 1 @@ -457,11 +616,11 @@ state 2 1 CONST_DEC_PART: CONST_DEC_LIST . 3 CONST_DEC_LIST: CONST_DEC_LIST . CONST_DEC - undef_id_tok reduce using rule 4 (@1) + undef_id_tok reduce using rule 4 ($@1) $default reduce using rule 1 (CONST_DEC_PART) CONST_DEC go to state 6 - @1 go to state 4 + $@1 go to state 4 state 3 @@ -473,7 +632,7 @@ state 3 state 4 - 5 CONST_DEC: @1 . undef_id_tok '=' const_id_tok ';' + 5 CONST_DEC: $@1 . undef_id_tok '=' const_id_tok ';' undef_id_tok shift, and go to state 7 @@ -494,28 +653,28 @@ state 6 state 7 - 5 CONST_DEC: @1 undef_id_tok . '=' const_id_tok ';' + 5 CONST_DEC: $@1 undef_id_tok . '=' const_id_tok ';' '=' shift, and go to state 8 state 8 - 5 CONST_DEC: @1 undef_id_tok '=' . const_id_tok ';' + 5 CONST_DEC: $@1 undef_id_tok '=' . const_id_tok ';' const_id_tok shift, and go to state 9 state 9 - 5 CONST_DEC: @1 undef_id_tok '=' const_id_tok . ';' + 5 CONST_DEC: $@1 undef_id_tok '=' const_id_tok . ';' ';' shift, and go to state 10 state 10 - 5 CONST_DEC: @1 undef_id_tok '=' const_id_tok ';' . + 5 CONST_DEC: $@1 undef_id_tok '=' const_id_tok ';' . $default reduce using rule 5 (CONST_DEC) ]]) @@ -535,7 +694,7 @@ AT_CLEANUP # # It used to be wrong on yydefact only: # -# static const short yydefact[] = +# static const yytype_uint8 yydefact[] = # { # - 2, 0, 1, 0, 0, 2, 3, 2, 5, 4, # + 2, 0, 1, 0, 0, 0, 3, 2, 5, 4, @@ -558,14 +717,13 @@ else: "else" statement; %% ]]) -AT_CHECK([bison -v -o input.c input.y]) +AT_BISON_CHECK([-v -o input.c input.y]) -# Check only the tables. We don't use --no-parser, because it is -# still to be implemented in the experimental branch of Bison. +# Check only the tables. [sed -n 's/ *$//;/^static const.*\[\] =/,/^}/p' input.c >tables.c] AT_CHECK([[cat tables.c]], 0, -[[static const unsigned char yytranslate[] = +[[static const yytype_uint8 yytranslate[] = { 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, @@ -595,16 +753,16 @@ AT_CHECK([[cat tables.c]], 0, 2, 2, 2, 2, 2, 2, 1, 2, 3, 4, 5, 6 }; -static const unsigned char yyprhs[] = +static const yytype_uint8 yyprhs[] = { 0, 0, 3, 5, 6, 9, 14 }; -static const yysigned_char yyrhs[] = +static const yytype_int8 yyrhs[] = { 8, 0, -1, 9, -1, -1, 10, 11, -1, 3, 4, 5, 8, -1, 6, 8, -1 }; -static const unsigned char yyrline[] = +static const yytype_uint8 yyrline[] = { 0, 2, 2, 3, 3, 4, 5 }; @@ -613,45 +771,45 @@ static const char *const yytname[] = "$end", "error", "$undefined", "\"if\"", "\"const\"", "\"then\"", "\"else\"", "$accept", "statement", "struct_stat", "if", "else", 0 }; -static const unsigned short yytoknum[] = +static const yytype_uint16 yytoknum[] = { 0, 256, 257, 258, 259, 260, 261 }; -static const unsigned char yyr1[] = +static const yytype_uint8 yyr1[] = { 0, 7, 8, 9, 9, 10, 11 }; -static const unsigned char yyr2[] = +static const yytype_uint8 yyr2[] = { 0, 2, 1, 0, 2, 4, 2 }; -static const unsigned char yydefact[] = +static const yytype_uint8 yydefact[] = { 3, 0, 0, 2, 0, 0, 1, 3, 4, 3, 6, 5 }; -static const yysigned_char yydefgoto[] = +static const yytype_int8 yydefgoto[] = { -1, 2, 3, 4, 8 }; -static const yysigned_char yypact[] = +static const yytype_int8 yypact[] = { -2, -1, 4, -8, 0, 2, -8, -2, -8, -2, -8, -8 }; -static const yysigned_char yypgoto[] = +static const yytype_int8 yypgoto[] = { -8, -7, -8, -8, -8 }; -static const unsigned char yytable[] = +static const yytype_uint8 yytable[] = { 10, 1, 11, 5, 6, 0, 7, 9 }; -static const yysigned_char yycheck[] = +static const yytype_int8 yycheck[] = { 7, 3, 9, 4, 0, -1, 6, 5 }; -static const unsigned char yystos[] = +static const yytype_uint8 yystos[] = { 0, 3, 8, 9, 10, 4, 0, 6, 11, 5, 8, 8 @@ -677,7 +835,8 @@ m4_define([_AT_DATA_DANCER_Y], [%{ static int yylex (AT_LALR1_CC_IF([int *], [void])); AT_LALR1_CC_IF([], -[#include +[#include +#include static void yyerror (const char *);]) %} $1 @@ -725,23 +884,20 @@ member: STRING ; %% AT_LALR1_CC_IF( -[/* Currently, print_ is required in C++. */ +[/* A C++ error reporting function. */ void -yy::Parser::print_ () +yy::parser::error (const location&, const std::string& m) { -} - -/* A C++ error reporting function. */ -void -yy::Parser::error_ () -{ - std::cerr << message << std::endl; + std::cerr << m << std::endl; } int -yyparse (void) +yyparse () { - yy::Parser parser (!!YYDEBUG); + yy::parser parser; +#if YYDEBUG + parser.set_debug_level (YYDEBUG); +#endif return parser.parse (); } ], @@ -754,12 +910,14 @@ yyerror (const char *s) static int yylex (AT_LALR1_CC_IF([int *lval], [void])) [{ - static int toknum = 0; - int tokens[] = + static int const tokens[] = { ':', -1 }; + static size_t toknum; ]AT_LALR1_CC_IF([*lval = 0; /* Pacify GCC. */])[ + if (! (toknum < sizeof tokens / sizeof *tokens)) + abort (); return tokens[toknum++]; }] @@ -779,9 +937,8 @@ m4_define([AT_CHECK_DANCER], [AT_SETUP([Dancer $1]) AT_BISON_OPTION_PUSHDEFS([$1]) _AT_DATA_DANCER_Y([$1]) -AT_CHECK([bison -o dancer.c dancer.y]) -AT_LALR1_CC_IF([AT_COMPILE_CXX([dancer])], - [AT_COMPILE([dancer])]) +AT_BISON_CHECK([-o dancer.c dancer.y]) +AT_FULL_COMPILE([dancer]) AT_PARSER_CHECK([./dancer], 1, [], [syntax error, unexpected ':' ]) @@ -792,3 +949,725 @@ AT_CLEANUP AT_CHECK_DANCER() AT_CHECK_DANCER([%glr-parser]) AT_CHECK_DANCER([%skeleton "lalr1.cc"]) + + +## ------------------------------------------ ## +## Diagnostic that expects two alternatives. ## +## ------------------------------------------ ## + + +# _AT_DATA_EXPECT2_Y(BISON-OPTIONS) +# -------------------------------- +m4_define([_AT_DATA_EXPECT2_Y], +[AT_DATA_GRAMMAR([expect2.y], +[%{ +static int yylex (AT_LALR1_CC_IF([int *], [void])); +AT_LALR1_CC_IF([], +[#include +#include +static void yyerror (const char *);]) +%} +$1 +%defines +%error-verbose +%token A 1000 +%token B + +%% +program: /* empty */ + | program e ';' + | program error ';'; + +e: e '+' t | t; +t: A | B; + +%% +AT_LALR1_CC_IF( +[/* A C++ error reporting function. */ +void +yy::parser::error (const location&, const std::string& m) +{ + std::cerr << m << std::endl; +} + +int +yyparse () +{ + yy::parser parser; + return parser.parse (); +} +], +[static void +yyerror (const char *s) +{ + fprintf (stderr, "%s\n", s); +}]) + +static int +yylex (AT_LALR1_CC_IF([int *lval], [void])) +[{ + static int const tokens[] = + { + 1000, '+', '+', -1 + }; + static size_t toknum; + ]AT_LALR1_CC_IF([*lval = 0; /* Pacify GCC. */])[ + if (! (toknum < sizeof tokens / sizeof *tokens)) + abort (); + return tokens[toknum++]; +}] + +int +main (void) +{ + return yyparse (); +} +]) +])# _AT_DATA_EXPECT2_Y + + +# AT_CHECK_EXPECT2(BISON-OPTIONS) +# ------------------------------ +# Generate the grammar, compile it, run it. +m4_define([AT_CHECK_EXPECT2], +[AT_SETUP([Expecting two tokens $1]) +AT_BISON_OPTION_PUSHDEFS([$1]) +_AT_DATA_EXPECT2_Y([$1]) +AT_BISON_CHECK([-o expect2.c expect2.y]) +AT_FULL_COMPILE([expect2]) +AT_PARSER_CHECK([./expect2], 1, [], +[syntax error, unexpected '+', expecting A or B +]) +AT_BISON_OPTION_POPDEFS +AT_CLEANUP +]) + +AT_CHECK_EXPECT2() +AT_CHECK_EXPECT2([%glr-parser]) +AT_CHECK_EXPECT2([%skeleton "lalr1.cc"]) + + + +## --------------------------------------------- ## +## Braced code in declaration in rules section. ## +## --------------------------------------------- ## + +AT_SETUP([Braced code in declaration in rules section]) + +# Bison once mistook braced code in a declaration in the rules section to be a +# rule action. + +AT_DATA_GRAMMAR([input.y], +[[%{ +#include +static void yyerror (char const *msg); +static int yylex (void); +%} + +%error-verbose + +%% + +start: + { + printf ("Bison would once convert this action to a midrule because of the" + " subsequent braced code.\n"); + } + ; + +%destructor { fprintf (stderr, "DESTRUCTOR\n"); } 'a'; +%printer { fprintf (yyoutput, "PRINTER"); } 'a'; + +%% + +static void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +static int +yylex (void) +{ + return 'a'; +} + +int +main (void) +{ + yydebug = 1; + return !yyparse (); +} +]]) + +AT_BISON_CHECK([-t -o input.c input.y]) +AT_COMPILE([input]) +AT_PARSER_CHECK([./input], 0, +[[Bison would once convert this action to a midrule because of the subsequent braced code. +]], +[[Starting parse +Entering state 0 +Reducing stack by rule 1 (line 20): +-> $$ = nterm start () +Stack now 0 +Entering state 1 +Reading a token: Next token is token 'a' (PRINTER) +syntax error, unexpected 'a', expecting $end +Error: popping nterm start () +Stack now 0 +Cleanup: discarding lookahead token 'a' (PRINTER) +DESTRUCTOR +Stack now 0 +]]) + +AT_CLEANUP + + + +## --------------------------------- ## +## String alias declared after use. ## +## --------------------------------- ## + +AT_SETUP([String alias declared after use]) + +# Bison once incorrectly asserted that the symbol number for either a token or +# its alias was the highest symbol number so far at the point of the alias +# declaration. That was true unless the declaration appeared after their first +# uses and other tokens appeared in between. + +AT_DATA([input.y], +[[%% +start: 'a' "A" 'b'; +%token 'a' "A"; +]]) + +AT_BISON_CHECK([-t -o input.c input.y]) + +AT_CLEANUP + + + +## -------------------------------- ## +## Extra lookahead sets in report. ## +## -------------------------------- ## + +AT_SETUP([[Extra lookahead sets in report]]) + +# Bison prints each reduction's lookahead set only next to the associated +# state's one item that (1) is associated with the same rule as the reduction +# and (2) has its dot at the end of its RHS. Previously, Bison also +# erroneously printed the lookahead set next to all of the state's other items +# associated with the same rule. This bug affected only the `.output' file and +# not the generated parser source code. + +AT_DATA([[input.y]], +[[%% +start: a | 'a' a 'a' ; +a: 'a' ; +]]) + +AT_BISON_CHECK([[--report=all input.y]]) +AT_CHECK([[sed -n '/^state 1$/,/^state 2$/p' input.output]], [[0]], +[[state 1 + + 2 start: 'a' . a 'a' + 3 a: . 'a' + 3 | 'a' . [$end] + + 'a' shift, and go to state 4 + + $default reduce using rule 3 (a) + + a go to state 5 + + +state 2 +]]) + +AT_CLEANUP + + + +## ---------------------------------------- ## +## Token number in precedence declaration. ## +## ---------------------------------------- ## + +AT_SETUP([[Token number in precedence declaration]]) + +# POSIX says token numbers can be declared in %left, %right, and %nonassoc, but +# we lost this in Bison 1.50. + +AT_DATA_GRAMMAR([input.y], +[[%{ + #include + void yyerror (char const *); + int yylex (void); +%} + +%error-verbose +%right END 0 +%left TK1 1 TK2 2 "tok alias" 3 + +%% + +start: + TK1 sr_conflict "tok alias" + | start %prec END + ; +sr_conflict: + TK2 + | TK2 "tok alias" + ; + +%% + +void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +yylex (void) +{ + static int const input[] = { 1, 2, 3, 0 }; + static int const *inputp = input; + return *inputp++; +} + +int +main (void) +{ + return yyparse (); +} +]]) + +AT_BISON_CHECK([[-o input.c input.y]], [[0]],, +[[input.y:23.5-19: warning: rule useless in parser due to conflicts: start: start +input.y:27.5-19: warning: rule useless in parser due to conflicts: sr_conflict: TK2 "tok alias" +]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input]]) + +AT_CLEANUP + + + +## --------------------------- ## +## parse-gram.y: LALR = IELR. ## +## --------------------------- ## + +# If parse-gram.y's LALR and IELR parser tables ever begin to differ, we +# need to fix parse-gram.y or start using IELR. + +AT_SETUP([[parse-gram.y: LALR = IELR]]) + +# Avoid differences in synclines by telling bison that the output files +# have the same name. +[cp $abs_top_srcdir/src/parse-gram.y input.y] +AT_BISON_CHECK([[-o input.c -Dlr.type=lalr input.y]]) +[mv input.c lalr.c] +AT_BISON_CHECK([[-o input.c -Dlr.type=ielr input.y]]) +[mv input.c ielr.c] +AT_CHECK([[diff -u lalr.c ielr.c]]) + +AT_CLEANUP + + + +## --------------------------------------- ## +## %error-verbose and YYSTACK_USE_ALLOCA. ## +## --------------------------------------- ## + +AT_SETUP([[%error-verbose and YYSTACK_USE_ALLOCA]]) + +AT_DATA_GRAMMAR([input.y], +[[%code { + #include + void yyerror (char const *); + int yylex (void); + #define YYSTACK_USE_ALLOCA 1 +} + +%error-verbose + +%% + +start: check syntax_error syntax_error ; + +check: +{ + if (128 < sizeof yymsgbuf) + { + fprintf (stderr, + "The initial size of yymsgbuf in yyparse has increased\n" + "since this test group was last updated. As a result,\n" + "this test group may no longer manage to induce a\n" + "reallocation of the syntax error message buffer.\n" + "This test group must be adjusted to produce a longer\n" + "error message.\n"); + YYABORT; + } +} +; + +// Induce a syntax error message whose total length is more than +// sizeof yymsgbuf in yyparse. Each token here is 64 bytes. +syntax_error: + "123456789112345678921234567893123456789412345678951234567896123A" +| "123456789112345678921234567893123456789412345678951234567896123B" +| error 'a' 'b' 'c' +; + +%% + +void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +yylex (void) +{ + /* Induce two syntax error messages (which requires full error + recovery by shifting 3 tokens) in order to detect any loss of the + reallocated buffer. */ + static char const *input = "abc"; + return *input++; +} + +int +main (void) +{ + return yyparse (); +} +]]) + +AT_BISON_CHECK([[-o input.c input.y]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input]], [[1]], [], +[[syntax error, unexpected 'a', expecting 123456789112345678921234567893123456789412345678951234567896123A or 123456789112345678921234567893123456789412345678951234567896123B +syntax error, unexpected $end, expecting 123456789112345678921234567893123456789412345678951234567896123A or 123456789112345678921234567893123456789412345678951234567896123B +]]) + +AT_CLEANUP + + + +## ------------------------- ## +## %error-verbose overflow. ## +## ------------------------- ## + +# Imagine the case where YYSTACK_ALLOC_MAXIMUM = YYSIZE_MAXIMUM and an +# invocation of yysyntax_error has caused yymsg_alloc to grow to exactly +# YYSTACK_ALLOC_MAXIMUM (perhaps because the normal doubling of size had +# to be clipped to YYSTACK_ALLOC_MAXIMUM). In an old version of yacc.c, +# a subsequent invocation of yysyntax_error that overflows during its +# size calculation would return YYSIZE_MAXIMUM to yyparse. Then, +# yyparse would invoke yyerror using the old contents of yymsg. + +AT_SETUP([[%error-verbose overflow]]) + +AT_DATA_GRAMMAR([input.y], +[[%code { + #include + void yyerror (char const *); + int yylex (void); + + /* This prevents this test case from having to induce error messages + large enough to overflow size_t. */ + #define YYSIZE_T unsigned char + + /* Bring in malloc and set EXIT_SUCCESS so yacc.c doesn't try to + provide a malloc prototype using our YYSIZE_T. */ + #include + #ifndef EXIT_SUCCESS + # define EXIT_SUCCESS 0 + #endif + + /* Max depth is usually much smaller than YYSTACK_ALLOC_MAXIMUM, and + we don't want gcc to warn everywhere this constant would be too big + to make sense for our YYSIZE_T. */ + #define YYMAXDEPTH 100 +} + +%error-verbose + +%% + +start: syntax_error1 check syntax_error2 ; + +// Induce a syntax error message whose total length causes yymsg in +// yyparse to be reallocated to size YYSTACK_ALLOC_MAXIMUM, which +// should be 255. Each token here is 64 bytes. +syntax_error1: + "123456789112345678921234567893123456789412345678951234567896123A" +| "123456789112345678921234567893123456789412345678951234567896123B" +| "123456789112345678921234567893123456789412345678951234567896123C" +| error 'a' 'b' 'c' +; + +check: +{ + if (yymsg_alloc != YYSTACK_ALLOC_MAXIMUM + || YYSTACK_ALLOC_MAXIMUM != YYSIZE_MAXIMUM + || YYSIZE_MAXIMUM != 255) + { + fprintf (stderr, + "The assumptions of this test group are no longer\n" + "valid, so it may no longer catch the error it was\n" + "designed to catch. Specifically, the following\n" + "values should all be 255:\n\n"); + fprintf (stderr, " yymsg_alloc = %d\n", yymsg_alloc); + fprintf (stderr, " YYSTACK_ALLOC_MAXIMUM = %d\n", + YYSTACK_ALLOC_MAXIMUM); + fprintf (stderr, " YYSIZE_MAXIMUM = %d\n", YYSIZE_MAXIMUM); + YYABORT; + } +} +; + +// Now overflow. +syntax_error2: + "123456789112345678921234567893123456789412345678951234567896123A" +| "123456789112345678921234567893123456789412345678951234567896123B" +| "123456789112345678921234567893123456789412345678951234567896123C" +| "123456789112345678921234567893123456789412345678951234567896123D" +| "123456789112345678921234567893123456789412345678951234567896123E" +; + +%% + +void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +yylex (void) +{ + /* Induce two syntax error messages (which requires full error + recovery by shifting 3 tokens). */ + static char const *input = "abc"; + return *input++; +} + +int +main (void) +{ + /* Push parsers throw away the message buffer between tokens, so skip + this test under maintainer-push-check. */ + if (YYPUSH) + return 77; + return yyparse (); +} +]]) + +AT_BISON_CHECK([[-o input.c input.y]]) + +# gcc warns about tautologies and fallacies involving comparisons for +# unsigned char. However, it doesn't produce these same warnings for +# size_t and many other types when the warnings would seem to make just +# as much sense. We ignore the warnings. +[CFLAGS="$NO_WERROR_CFLAGS"] +AT_COMPILE([[input]]) + +AT_PARSER_CHECK([[./input]], [[2]], [], +[[syntax error, unexpected 'a', expecting 123456789112345678921234567893123456789412345678951234567896123A or 123456789112345678921234567893123456789412345678951234567896123B or 123456789112345678921234567893123456789412345678951234567896123C +syntax error +memory exhausted +]]) + +AT_CLEANUP + + + +## ------------------------ ## +## LAC: Exploratory stack. ## +## ------------------------ ## + +AT_SETUP([[LAC: Exploratory stack]]) + +m4_pushdef([AT_LAC_CHECK], [ + +AT_BISON_OPTION_PUSHDEFS([$1]) + +AT_DATA_GRAMMAR([input.y], +[[%code { + #include + void yyerror (char const *); + int yylex (]AT_PURE_IF([[YYSTYPE *]], [[void]])[); +} + +]$1[ +%error-verbose +%token 'c' + +%% + +// default reductions in inconsistent states +// v v v v v v v v v v v v v v +S: A B A A B A A A A B A A A A A A A B C C A A A A A A A A A A A A B ; +// ^ ^ ^ +// LAC reallocs + +A: 'a' | /*empty*/ { printf ("inconsistent default reduction\n"); } ; +B: 'b' ; +C: /*empty*/ { printf ("consistent default reduction\n"); } ; + +%% + +void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +yylex (]AT_PURE_IF([[YYSTYPE *v]], [[void]])[) +{ + static char const *input = "bbbbc";]AT_PURE_IF([[ + *v = 0;]])[ + return *input++; +} + +int +main (void) +{ + yydebug = 1; + return yyparse (); +} +]]) + +AT_BISON_CHECK([[-Dparse.lac=full -Dparse.lac.es-capacity-initial=1 \ + -Dparse.lac.memory-trace=full \ + -t -o input.c input.y]], [[0]], [], +[[input.y: conflicts: 21 shift/reduce +]]) +AT_COMPILE([[input]]) +AT_PARSER_CHECK([[./input > stdout.txt 2> stderr.txt]], [[1]]) + +# Make sure syntax error doesn't forget that 'a' is expected. It would +# be forgotten without lookahead correction. +AT_CHECK([[grep 'syntax error,' stderr.txt]], [[0]], +[[syntax error, unexpected 'c', expecting 'a' or 'b' +]]) + +# Check number of default reductions in inconsistent states to be sure +# syntax error is detected before unnecessary reductions are performed. +AT_CHECK([[perl -0777 -ne 'print s/inconsistent default reduction//g;' \ + < stdout.txt || exit 77]], [[0]], [[14]]) + +# Check number of default reductions in consistent states to be sure +# it is performed before the syntax error is detected. +AT_CHECK([[perl -0777 -ne 'print s/\bconsistent default reduction//g;' \ + < stdout.txt || exit 77]], [[0]], [[2]]) + +# Check number of reallocs to be sure reallocated memory isn't somehow +# lost between LAC invocations. +AT_CHECK([[perl -0777 -ne 'print s/\(realloc//g;' < stderr.txt \ + || exit 77]], [[0]], [[3]]) + +AT_BISON_OPTION_POPDEFS +]) + +AT_LAC_CHECK([[%define api.push-pull pull]]) +AT_LAC_CHECK([[%define api.push-pull pull %define api.pure]]) +AT_LAC_CHECK([[%define api.push-pull both]]) +AT_LAC_CHECK([[%define api.push-pull both %define api.pure]]) + +m4_popdef([AT_LAC_CHECK]) + +AT_CLEANUP + + + +## ------------------------ ## +## LAC: Memory exhaustion. ## +## ------------------------ ## + +AT_SETUP([[LAC: Memory exhaustion]]) + +m4_pushdef([AT_LAC_CHECK], [ + +AT_DATA_GRAMMAR([input.y], +[[%code { + #include + void yyerror (char const *); + int yylex (void); + #define YYMAXDEPTH 8 +} + +%error-verbose + +%% + +S: A A A A A A A A A ; +A: /*empty*/ | 'a' ; + +%% + +void +yyerror (char const *msg) +{ + fprintf (stderr, "%s\n", msg); +} + +int +yylex (void) +{ + static char const *input = "]$1["; + return *input++; +} + +int +main (void) +{ + yydebug = 1; + return yyparse (); +} +]]) + +AT_BISON_CHECK([[-Dparse.lac=full -Dparse.lac.es-capacity-initial=1 \ + -t -o input.c input.y]], [[0]], [], +[[input.y: conflicts: 8 shift/reduce +]]) +AT_COMPILE([[input]]) + +]) + +# Check for memory exhaustion during parsing. +AT_LAC_CHECK([[]]) +AT_PARSER_CHECK([[./input]], [[2]], [[]], +[[Starting parse +Entering state 0 +Reading a token: Now at end of input. +LAC: initial context established for $end +LAC: checking lookahead $end: R2 G3 R2 G5 R2 G6 R2 G7 R2 G8 R2 G9 R2 G10 R2 G11 R2 (max size exceeded) +memory exhausted +Cleanup: discarding lookahead token $end () +Stack now 0 +]]) + +# Induce an immediate syntax error with an undefined token, and check +# for memory exhaustion while building syntax error message. +AT_LAC_CHECK([[z]], [[0]]) +AT_PARSER_CHECK([[./input]], [[2]], [[]], +[[Starting parse +Entering state 0 +Reading a token: Next token is token $undefined () +LAC: initial context established for $undefined +LAC: checking lookahead $undefined: Always Err +Constructing syntax error message +LAC: checking lookahead $end: R2 G3 R2 G5 R2 G6 R2 G7 R2 G8 R2 G9 R2 G10 R2 G11 R2 (max size exceeded) +syntax error +memory exhausted +Cleanup: discarding lookahead token $undefined () +Stack now 0 +]]) + +m4_popdef([AT_LAC_CHECK]) + +AT_CLEANUP